CN115621673A - Utmost point ear subassembly, circuit board, electric core, battery, electronic equipment and mobile device - Google Patents

Utmost point ear subassembly, circuit board, electric core, battery, electronic equipment and mobile device Download PDF

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Publication number
CN115621673A
CN115621673A CN202110808787.4A CN202110808787A CN115621673A CN 115621673 A CN115621673 A CN 115621673A CN 202110808787 A CN202110808787 A CN 202110808787A CN 115621673 A CN115621673 A CN 115621673A
Authority
CN
China
Prior art keywords
tab
battery
protection plate
insulating
circuit board
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110808787.4A
Other languages
Chinese (zh)
Inventor
洪达
徐凡
薛原
邓耀明
田雷雷
张炳雁
谢封超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
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Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN202110808787.4A priority Critical patent/CN115621673A/en
Priority to PCT/CN2022/103605 priority patent/WO2023284575A1/en
Publication of CN115621673A publication Critical patent/CN115621673A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/519—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising printed circuit boards [PCB]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0277—Bendability or stretchability details
    • H05K1/028—Bending or folding regions of flexible printed circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The application provides a utmost point ear subassembly, circuit board, battery protection shield, electric core, battery. The tab assembly comprises a first tab and a second tab, the first tab is an anode tab or a cathode tab, and the second tab is a reference electrode tab. The first tab and the second tab are separated by an insulating member to prevent the first tab and the second tab from being short-circuited. One end of the first tab is electrically connected with one pin of the battery protection plate, and the other end of the first tab is attached to the electrode of the battery. One end of the second tab is electrically connected with the other pin of the battery protection plate, and the other end of the second tab is in contact with electrolyte. The scheme provided by the embodiment of the application can enable the battery to have at least three electrodes, so that the state of the battery can be conveniently monitored by electronic equipment, and the use performance of the battery can be favorably improved.

Description

Utmost point ear subassembly, circuit board, electric core, battery, electronic equipment and mobile device
Technical Field
The application relates to the field of batteries and electronic equipment, more specifically relates to a tab assembly, a circuit board, a battery core, a battery, electronic equipment and a mobile device.
Background
Through the positive pole tab and the negative pole tab, the battery can receive the charge of an external power supply and can also discharge to other devices. By detecting the voltage difference between the positive electrode tab and the negative electrode tab, the state of charge and the state of discharge of the battery can be roughly estimated. However, the potentials of the positive electrode and the negative electrode themselves may affect the accuracy of estimating the state of charge and the state of discharge of the battery. Therefore, the battery may include a reference electrode tab that separately detects the potential of the positive electrode tab or the potential of the negative electrode tab. Adding new tabs to the battery may create new problems, such as increasing the footprint of the battery, reducing the mechanical stability and life of the battery, reducing the production efficiency of the battery, being incompatible with the structure of the battery protection plate, etc. Therefore, how to design a reference electrode tab in a battery is a problem to be solved urgently.
Disclosure of Invention
The application provides a utmost point ear subassembly, circuit board, battery protection shield, electric core, battery, electronic equipment and mobile device can carry out the integrated design with reference electrode utmost point ear and ordinary utmost point ear (anodal utmost point ear or negative pole utmost point ear), reduces because of setting up the influence that reference electrode produced the battery.
In a first aspect, a tab assembly is provided for a battery, the battery includes a pole piece, an electrolyte and a battery protection plate, and the tab assembly includes:
the first tab is a positive tab or a negative tab, the first end of the first tab is used for being electrically connected with the battery protection plate, and the second end of the first tab is used for being electrically connected with the pole piece;
the second tab is a reference electrode tab, the first end of the second tab is used for being electrically connected with the battery protection plate, and the second end of the second tab is used for being in contact with the electrolyte;
and the insulating component is stacked with the first lug or the second lug, and the insulating component is positioned between the first lug and the second lug.
The insulation member is disposed to be laminated with the tab, which may mean that at least a portion of the insulation member is disposed to be laminated with at least a portion of the tab.
The present application provides a tab assembly, a plurality of electrodes (including any one of a positive electrode, a negative electrode, and a reference electrode) constituting a battery. The insulating member may space the first tab and the second tab apart, i.e., the insulating member may isolate the first tab from the second tab such that the first tab and the second tab are not electrically connected by way of a short circuit. The tab assembly can integrate a plurality of electrodes, and is favorable for reducing the processing difficulty of relevant parts of the battery. Unlike other types of conductive members (e.g., wires), since most batteries have tabs, adding new tabs to the battery is relatively easy to be compatible with existing batteries. Once the tab is fixed to the cell casing, the position, shape, etc. of the tab is generally relatively stable. Compared with other types of conductive pieces, the tab is beneficial to taking the mechanical property and the service performance of the battery into consideration. The reference electrode tab and the positive electrode tab, or the reference electrode tab and the negative electrode tab, may be relatively tightly combined together through an insulating member. Therefore, the tab assembly is arranged at the position where the tab is to be arranged originally, so that the large-current scene of the battery and the occupied space of the battery are both considered.
With reference to the first aspect, in certain implementations of the first aspect, the first end surface of the first tab and the first end surface of the second tab are configured to be electrically connected to the battery protection board, the insulating member includes a first portion and a second portion, and the insulating member and the second tab are stacked in a specific manner: the first portion of insulating part with the range upon range of setting of second utmost point ear, wherein, the first terminal surface subsides of the first portion of insulating part are covered on the second terminal surface of second utmost point ear, the second portion subsides of insulating part is covered between first utmost point ear and the two adjacent sides of second utmost point ear, the first terminal surface of second utmost point ear with the second terminal surface back of the body sets up.
The insulating part can wrap two mutually perpendicular surfaces, close to the first pole lug, of the second pole lug, and the probability of short circuit of the first pole lug and the second pole lug is favorably reduced.
The total thickness of insulating part and the total thickness of first utmost point ear can be the same, is favorable to improving utmost point ear subassembly's whole planarization, is convenient for set up utmost point ear subassembly is sealed in electrical core shell.
The first tab, the insulating part and the second tab can be arranged in the direction parallel to the battery protection plate, so that the first tab and the second tab can be conveniently and electrically connected with the battery protection plate.
In combination with the first aspect, in certain implementations of the first aspect, the first tab includes a first portion and a second portion, the first portion of the insulating member is further disposed in a stacked relation with the first portion of the first tab,
the first part of the first tab is attached to the second end surface of the insulating part, the first end surface of the insulating part is arranged opposite to the second end surface of the insulating part,
the second portion of the first tab is attached to the second portion of the insulating member.
Compare with insulating part and second utmost point ear, the gross thickness of first utmost point ear can be great relatively in the utmost point ear subassembly, first utmost point ear with the area of pole piece contact can be great relatively, be favorable to reducing the impedance of first utmost point ear, and then be favorable to reducing the impedance of battery, improve the charge-discharge efficiency of battery.
With reference to the first aspect, in certain implementations of the first aspect, the stacking arrangement of the insulating member and the first or second tab is specifically: the first electrode lug, the second electrode lug and the insulating part are arranged in a stacked mode, the second electrode lug comprises an extension portion, the extension portion is perpendicular to the extending direction of the first electrode lug and extends towards the direction far away from the first electrode lug, and the extension portion is used for being electrically connected with the battery protection board.
First utmost point ear, insulating part, second utmost point ear can range upon range of setting, are favorable to improving utmost point ear subassembly's whole planarization, are convenient for set up utmost point ear subassembly seal in cell shell. The extension part is arranged on the second pole lug, so that the first pole lug and the second pole lug can be connected with different areas of the battery protection plate respectively.
The first tab may include a battery connection region for electrical connection with the battery.
With reference to the first aspect, in certain implementations of the first aspect, at an end away from the battery connection region, the first tab extends relative to the insulating member, and the insulating member extends relative to the second tab, and a first end of the first tab and a first end of the second tab are configured to be disposed on two sides of the battery protection board.
The first tab and the insulating component can extend out relative to the second tab. The first tab extends out a distance greater than the extension distance of the insulating member, so that the first tab can be turned over from one side of the battery protection board to the other side, and the first tab and the second tab can be electrically connected with two sides of the battery protection board respectively. This is advantageous in improving the flexibility of electrical connection between the battery protection plate and the tab assembly.
In combination with the first aspect, in certain implementations of the first aspect, the battery connecting region of the first tab protrudes relative to the insulating member, and an end of the insulating member adjacent to the battery connecting region protrudes relative to the second tab.
The insulating part extends out for a larger distance relative to the second pole lug, so that the possibility of mutual contact and short circuit of the first pole lug and the second pole lug is reduced.
With reference to the first aspect, in certain implementations of the first aspect, the insulating member extends in a direction perpendicular to the second tab and wraps around the second end of the second tab.
In one example, an extension length of the first tab with respect to the insulating member is greater than a sum of a thickness of the second tab and three times a thickness of the insulating member at a side away from the battery connecting region. The distance that first utmost point ear stretches out for the second utmost point ear can be longer relatively, is favorable to turning over first utmost point ear to the opposite side from one side of battery protection board for first utmost point ear, second utmost point ear can be connected with the both sides electricity of battery protection board respectively.
In another example, a side surface of the insulating member is located between a side surface of the first tab and a side surface of the second tab at a side near the battery connection region. The insulating part can stretch out for the second utmost point ear, is favorable to, especially under the unexpected scene such as collide with, temperature change, reduces the possibility of short circuit between first utmost point ear and the second utmost point ear.
With reference to the first aspect, in certain implementations of the first aspect, the insulating member extends in a direction perpendicular to the second tab and wraps around the second end of the second tab.
The distance that insulating part stretches out for the second utmost point ear is greater than the thickness of second utmost point ear for the side of insulating part can cover the second utmost point ear, is favorable to breaking off first utmost point ear and second utmost point ear.
With reference to the first aspect, in certain implementations of the first aspect, the second tab includes a first through hole, the insulating member includes a second through hole, the first through hole and the second through hole are communicated with each other, and the first through hole and the second through hole are both disposed opposite to the battery connection region.
First utmost point ear, second utmost point ear all include the through-hole of setting up relatively with battery connection region, are favorable to setting up battery connection region on first utmost point ear. The battery connection region may be, for example, a pad. When setting up the pad, the manipulator can support first utmost point ear through first through-hole, second through-hole, is favorable to reducing the processing degree of difficulty of battery connection area, improves the roughness of first utmost point ear after the processing.
In one example, the outer circumference of the tab assembly is provided with tab glue in a surrounding manner. The tab glue can be thermally sealed together with the cell shell, so that the sealing performance of the joint of the tab assembly and the cell shell is improved.
In a second aspect, a circuit board is provided for a battery, the battery includes a battery protection board, a pole piece and an electrolyte, and the circuit board includes:
the circuit comprises a first conducting layer, a second conducting layer and a third conducting layer, wherein a first circuit is arranged on the first conducting layer and is a positive circuit or a negative circuit;
a second conductive layer, wherein a second circuit is arranged on the second conductive layer, and the second circuit is a reference electrode circuit;
the first insulating layer is positioned on one side, far away from the second conducting layer, of the first conducting layer;
a second insulating layer between the first conductive layer and the second conductive layer;
a third insulating layer located on a side of the second conductive layer away from the first conductive layer;
a first electric connector and a second electric connector are arranged on the first insulating layer, the first electric connector and the second electric connector are both electrically connected with the first circuit, the first electric connector is used for being electrically connected with the battery protection board, and the second electric connector is used for being electrically connected with the pole piece;
a third electric connecting piece and a fourth electric connecting piece are arranged on the third insulating layer, the third electric connecting piece and the fourth electric connecting piece are both electrically connected with the second circuit, the third electric connecting piece is used for being electrically connected with the battery protection board, and the fourth electric connecting piece is used for being in contact with the electrolyte;
wherein the first and third electrical connections pass through the first insulating layer or the third insulating layer,
one of the second electric connecting piece and the fourth electric connecting piece penetrates through the first insulating layer, and the other one penetrates through the third insulating layer.
On one hand, the circuit components on the flexible circuit board can be relatively flexible, the processing efficiency of the flexible circuit board can be relatively increased, and the cost of devices such as batteries and the like can be reduced. On the other hand, the scheme provided by the application enables the flexible circuit board to be applied to the field of batteries, and breaks through the idea of using a tab form as an electrode of the battery.
With reference to the second aspect, in certain implementations of the second aspect, the circuit board includes a first portion and a second portion, the first portion and the second portion are disposed perpendicular to each other, one of the first electrical connector and the third electrical connector is disposed on the first portion, and the other is disposed on the second portion.
A plurality of conducting layers and a plurality of insulating layer of circuit board can range upon range of setting, are favorable to improving the whole planarization of circuit board, are convenient for set up the circuit board is sealed in electric core shell. By providing the first portion and the second portion on the circuit board, it is facilitated to connect the first electrical connector and the second electrical connector to different regions of the battery protection board, respectively.
With reference to the second aspect, in certain implementations of the second aspect, the second electrical connector, the fourth electrical connector are disposed at the first portion.
Two output ends of the same circuit are arranged on the same part of the circuit board, so that the wiring in the circuit board is simplified.
With reference to the second aspect, in certain implementations of the second aspect, a circuit board colloid is disposed around the outer periphery of the circuit board.
The circuit board colloid can be thermally sealed together with the battery cell shell, and the sealing performance of the joint of the circuit board and the battery cell shell is improved.
In a third aspect, there is provided a battery protection plate comprising the tab assembly as described in any one of the implementations of the first aspect, and a first protection plate pin and a second protection plate pin, wherein,
the first end of the first tab is electrically connected with the first protection plate pin, and the first end of the second tab is electrically connected with the second protection plate pin.
In a fourth aspect, there is provided a battery protection board comprising the circuit board as described in any one of the implementations of the second aspect above, and a first protection board pin and a second protection board pin, wherein,
the first electric connector is electrically connected with the first protection plate pin, and the third electric connector is electrically connected with the second protection plate pin.
In a fifth aspect, a battery cell is provided, which includes a pole piece, an electrolyte, a diaphragm, and a battery cell case, where the pole piece, the diaphragm, and the electrolyte are contained in the battery cell case, and the battery cell further includes the tab assembly as described in any one of the implementation manners of the first aspect.
With reference to the fifth aspect, in certain implementations of the fifth aspect, the battery further includes an insulating film attached to the tab assembly and located between the separator and the tab assembly.
Set up insulating film between diaphragm and utmost point ear subassembly, be favorable to reducing the touching power of pricking of utmost point ear subassembly to the diaphragm, reduce the possibility that the diaphragm was punctured.
With reference to the fifth aspect, in certain implementations of the fifth aspect, the insulating tape is a porous material.
The porous film is favorable for increasing the infiltration degree of the insulating film in the electrolyte, and further is favorable for increasing the contact degree of the second pole lug and the electrolyte.
In a sixth aspect, a battery cell is provided, which includes a pole piece, an electrolyte, a diaphragm, and a battery cell casing, where the battery cell, the electrolyte, and the diaphragm are contained in the battery cell casing, and the battery cell further includes the circuit board as described in any one of the implementation manners of the second aspect.
With reference to the sixth aspect, in certain implementations of the sixth aspect, the battery further includes an insulating rubber sheet attached to the circuit board and located between the diaphragm and the circuit board.
With reference to the sixth aspect, in certain implementations of the sixth aspect, the insulating film is a porous material.
With reference to the sixth aspect, in certain implementations of the sixth aspect, a circuit board colloid is disposed around the outer circumference of the circuit board, and the circuit board colloid is hermetically connected to the cell casing.
In a seventh aspect, a battery is provided, which includes the battery core and the battery protection board as described in any one implementation manner of the fifth aspect or the sixth aspect.
In an eighth aspect, an electronic device is provided, which includes the tab assembly as described in any one of the implementations of the first aspect, or includes the circuit board as described in any one of the implementations of the second aspect.
In a ninth aspect, there is provided a mobile device comprising a tab assembly as described in any one of the implementations of the first aspect above, or a circuit board as described in any one of the implementations of the second aspect above.
In a tenth aspect, there is provided a charging method comprising: monitoring that the current charging current of the battery is a first current, and the current negative electrode potential of the battery is greater than a preset potential; and controlling the charging current of the battery to be a second current, wherein the second current is smaller than the first current.
The potential of the negative pole piece can relatively directly and accurately reflect the lithium embedding amount or the lithium embedding capacity of the battery. There may also be a relatively direct relationship between the amount or capability of lithium insertion into the battery and the charging current of the battery (the closer the amount of lithium insertion is to the capability of lithium insertion, the smaller the charging current may be). Therefore, the charging current of the battery is controlled by monitoring the potential of the negative pole piece, the possibility of being charged too fast is favorably reduced, and the aging of the battery is favorably delayed.
In an eleventh aspect, there is provided a charging method, including: determining the anode impedance of the battery according to the anode potential or the cathode potential of the battery and the charging current of the battery; and under the condition that the impedance of the positive electrode of the battery is greater than a first preset impedance, adjusting the charging state of the battery or executing a first operation, wherein the first operation is used for indicating the current service life of the battery.
By detecting the impedance of the positive electrode of the battery, the state of the battery can be timely adjusted aiming at the positive electrode of the battery, so that the time length of the battery in a normal working state is prolonged, and the service life of the battery is prolonged. The relationship between the positive impedance and the state of charge of the battery may also reflect the life of the battery. The accuracy of the battery life inferred from the positive impedance and the state of charge of the battery is relatively high. Through carrying out first operation, the user of being convenient for knows the life-span of battery, and then the user of being convenient for rationally uses the battery.
With reference to the eleventh aspect, in certain implementations of the eleventh aspect, the adjusting the state of charge of the battery may include one or more of: reducing the charging current of the battery, reducing the charging voltage of the battery, reducing the temperature of the battery, and the like.
The positive electrode impedance may be increased due to, for example, an excessively high charging current, an excessively high charging voltage, an excessively high temperature, or the like. The charging current, the charging voltage and the temperature of the battery are adjusted, so that the anode impedance of the battery can be recovered as soon as possible, and the battery can be recovered to a normal working state.
With reference to the eleventh aspect, in certain implementations of the eleventh aspect, the method further comprises: and under the condition that the positive impedance of the battery is restored to the first preset impedance, determining the service life of the battery according to one or more of the charging current, the charging voltage and the temperature of the battery.
According to one or more of the charging current, the charging voltage and the temperature after the battery is recovered, the difficulty degree of recovering the battery to the normal working state can be judged, and the service life of the battery can be further favorably deduced.
With reference to the eleventh aspect, in certain implementations of the eleventh aspect, the first operation is specifically: the first operation indicates that the battery life is exhausted.
The battery management system can remind a user in time when the service life of the battery is exhausted, so that the user can replace the battery as soon as possible, and the risk that the electronic equipment cannot be started is reduced.
In a twelfth aspect, there is provided a charging method, including: determining the negative electrode impedance of the battery according to the positive electrode potential or the negative electrode potential of the battery and the charging current of the battery; and under the condition that the negative impedance of the battery is greater than a second preset impedance, adjusting the charging state of the battery or executing a second operation, wherein the second operation is used for indicating the current service life of the battery.
With reference to the twelfth aspect, in some implementations of the twelfth aspect, the adjusting the state of charge of the battery may include: reducing the charging current of the battery, reducing the charging voltage of the battery, reducing the temperature of the battery, and the like.
With reference to the twelfth aspect, in certain implementations of the twelfth aspect, the method further includes: and under the condition that the impedance of the negative electrode of the battery is recovered to the second preset impedance, determining the service life of the battery according to one or more of the charging current, the charging voltage and the temperature of the battery.
With reference to the twelfth aspect, in some implementations of the twelfth aspect, the first operation is specifically: the first operation indicates that the battery life is exhausted.
The charging method described in any one of the above-mentioned implementations of the tenth aspect to the twelfth aspect may be applied to the electronic device described in any one of the implementations of the eighth aspect, or applied to the mobile device described in any one of the implementations of the ninth aspect.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a battery assembly provided in an embodiment of the present application.
Fig. 3A is a schematic perspective view of a tab assembly and a battery protection plate according to an embodiment of the present application.
Fig. 3B is a schematic plan structure view of a tab assembly and a battery protection plate provided in an embodiment of the present application.
Fig. 3C is a schematic cross-sectional view of a tab assembly and a battery protection plate provided in an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a battery provided in an embodiment of the present application.
Fig. 5A is a schematic perspective view of a tab assembly and a battery protection plate according to an embodiment of the present disclosure.
Fig. 5B is a schematic plan structure view of a tab assembly and a battery protection plate provided in an embodiment of the present application.
Fig. 5C is a schematic cross-sectional view of a tab assembly and a battery protection plate provided in an embodiment of the present application.
Fig. 6 is a schematic structural diagram of a battery provided in an embodiment of the present application.
Fig. 7A is a schematic perspective view of a tab assembly and a battery protection plate according to an embodiment of the present application.
Fig. 7B is a schematic plan structure view of a tab assembly and a battery protection plate provided in an embodiment of the present application.
Fig. 7C is a schematic cross-sectional view of a tab assembly and a battery protection plate provided in an embodiment of the present application.
Fig. 8 is a schematic structural diagram of a battery provided in an embodiment of the present application.
Fig. 9 is a schematic perspective view of a tab assembly and a battery protection plate according to an embodiment of the present application.
Fig. 10A is a schematic perspective view of a tab assembly and a battery protection plate according to an embodiment of the present application.
Fig. 10B is a schematic plan structure view of a tab assembly and a battery protection plate provided in an embodiment of the present application.
Fig. 10C is a schematic cross-sectional view of a tab assembly and a battery protection plate provided in an embodiment of the present application.
Fig. 11A is a schematic perspective view of a tab assembly and a battery protection plate according to an embodiment of the present application.
Fig. 11B is a schematic plan structure view of a tab assembly and a battery protection plate provided in an embodiment of the present application.
Fig. 11C is a schematic plan structure view of a tab assembly and a battery protection plate according to an embodiment of the present application.
Fig. 11D is a schematic cross-sectional view of a tab assembly and a battery protection plate provided in an embodiment of the present application.
Fig. 11E is a schematic plan structure view of a tab assembly according to an embodiment of the present application.
Fig. 11F is a schematic cross-sectional view of a tab assembly provided by an embodiment of the present application.
Fig. 12A is a schematic structural diagram of a circuit board and a battery protection board provided in an embodiment of the present application.
Fig. 12B is a schematic cross-sectional view of a circuit board and a battery protection board provided in an embodiment of the present application.
Fig. 13 is a schematic structural diagram of a battery provided in an embodiment of the present application.
Fig. 14 is a schematic flowchart of a charging method according to an embodiment of the present application.
Fig. 15 is a graph of a battery state of charge provided by an embodiment of the present application.
Fig. 16 is a graph of another battery state of charge provided by an embodiment of the present application.
Fig. 17 is a schematic flowchart of another charging method provided in an embodiment of the present application.
Fig. 18 is a schematic flowchart of another charging method provided in an embodiment of the present application.
Fig. 19 is a schematic diagram for determining the positive impedance and the negative impedance according to the embodiment of the present application.
Detailed Description
The technical solution in the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an electronic device 100 provided in an embodiment of the present application. The electronic device 100 may be, for example, a terminal consumer product or a 3C electronic product (computer, communication, consumer), such as a mobile phone, a mobile power supply, a portable device, a tablet computer, an e-reader, a notebook computer, a digital camera, a wearable device, an earphone, and the like. The scheme applied to the electronic device 100 according to the embodiment of the present application may also be applied to other devices, such as a mobile device (e.g., a vehicle). The embodiment shown in fig. 1 is described by taking the electronic device 100 as a mobile phone.
The electronic device 100 may include a housing 10, a display 20, and a battery 30. Specifically, the housing 10 may include a bezel 12 and a rear cover 11. The bezel 12 may be located between the display screen 20 and the rear cover 11. The bezel 12 may surround the periphery of the display screen 20 and surround the periphery of the rear cover 11. The cavity formed between the display 20, the bezel 12, and the rear cover 11 may be used to house a battery 30.
Fig. 2 is a schematic structural diagram of a battery 30 provided in an embodiment of the present application. The battery 30 shown in fig. 2 may correspond to the battery 30 shown in fig. 1. The structure of a battery 30 will be described below with reference to fig. 1 and 2.
The battery 30 may include a cell 310 and a battery protection plate 320. The battery cell 310 may be electrically connected with the battery protection plate 320.
The battery cell 310 may be a main body component of the battery 30, and may store electric power. The battery cells 310 may be used to power electronics within the electronic device 100. The battery cell 310 may be a lithium ion secondary battery, a sodium ion secondary battery, a potassium ion secondary battery, a magnesium ion secondary battery, a zinc ion secondary battery, an aluminum ion secondary battery, or the like.
The battery protection plate 320 may serve to protect the battery cells 310 such that the charge state or the discharge state of the battery cells 310 may be relatively normal. The battery protection plate 320 may perform overcharge protection, overdischarge protection, overcurrent protection, overtemperature protection, and the like on the battery cell 310, for example.
The battery cell 310 may include a pole piece 311, a cell casing 312, a tab assembly 400, and a third tab 315. The pole piece 311 may be housed in the cell casing 312. One end of the tab assembly 400 may be electrically connected to one pole piece 311, and the other end of the tab assembly 400 may extend out of the cell casing 312. One end of the third tab 315 may be electrically connected to the other pole piece 311. The other end of the third tab 315 may extend out of the cell casing 312. The tab assembly 400 may include a first tab and a second tab, one of the first tab and the third tab 315 may serve as a positive electrode of the cell 310, the other may serve as a negative electrode of the cell 310, and the second tab may serve as a reference electrode of the cell 310.
The cell 310 may further include a first tab glue 440 and a second tab glue 3122. First tab glue 440 may wrap the junction of tab assembly 400 and cell casing 312, and second tab glue 3122 may wrap the junction of third tab 315 and cell casing 312, thereby facilitating the prevention of electrolyte 316 from flowing out of the junction of tab assembly 400 and cell casing 312, or the junction of third tab 315 and cell casing 312.
The battery protection plate 320 may include a protection plate base 321. The protection board substrate 321 may be a circuit board. The protection plate substrate 321 may include a plurality of conductive layers and a plurality of insulating layers disposed at intervals. An insulating layer is arranged between two adjacent conductive layers. And a conductive layer is arranged between every two adjacent insulating layers. An electric circuit such as a charging circuit, a discharging circuit, a battery monitoring circuit, a battery protection circuit, etc. may be formed on the protection board base 321.
The battery protection plate 320 may further include a first protection plate pin 322, a second protection plate pin 323, and a third protection plate pin 324 provided on the protection plate base 321. The first protection plate pin 322 of the battery protection plate 320 may be electrically connected with the first tab of the tab assembly 400. A second protective plate pin 323 of the battery protective plate 320 may be electrically connected with the second tab of the tab assembly 400. The third protection plate pin 324 of the battery protection plate 320 may be electrically connected with the third tab 315. The circuit formed on the battery cell 310, the first protection plate pin 322, the third protection plate pin 324 and the battery protection plate 320 may form a charge and discharge loop. The electric circuit formed on the battery cell 310, the first protection plate pin 322, the second protection plate pin 323, and the battery protection plate 320 may form an electric connection loop for monitoring the battery cell 310. The leads may be formed, for example, by conductive members such as pads, metal pieces, and the like.
The charging current, discharging current, and the voltage difference between the positive and negative electrodes of the battery 30 do not reflect the state of the battery 30 accurately enough. This may result in partially unsafe battery application scenarios that cannot be detected by the voltage management components. It may also result in the electronic device 100 not providing accurate battery status information to the user.
Providing a reference electrode on battery 30 may facilitate electronic device 100 in relatively accurately monitoring the state of battery 30. The reference electrode is used as a third electrode of the battery 30 except for the positive electrode and the negative electrode, and the potential of the positive electrode or the potential of the negative electrode can be monitored. For example, the battery 30 may output a reference electrode signal to the battery protection unit through the reference electrode. The power management element may thus acquire the reference electrode signal via the battery protection unit and monitor the state of the battery 30 in conjunction with other state information of the battery 30.
The provision of a reference electrode in a cell, although having relatively strong advantages, may however create other new problems. For example, the occupied space of the battery is increased, and thus the capacity of the battery may be reduced, or the design of the electronic device is contrary to the light and thin design. As another example, the structural member serving as the reference electrode is relatively difficult to design. The structural member serving as the reference electrode needs to have relatively high mechanical stability to reduce the influence on the battery life. The structural member serving as the reference electrode also needs to be compatible with the existing battery structure as much as possible, so that the influence on the battery performance (such as the sealing performance of the cell shell, the battery safety and the like), the battery processing difficulty, the battery processing efficiency and the like can be reduced.
The following explains the structure of the tab assembly 400 provided in the embodiment of the present application, and explains the connection relationship between the tab assembly 400 and the battery protection plate 320, and the connection relationship between the tab assembly 400 and the battery cell 310.
Fig. 3A-3C show schematic structural views of a tab assembly 400 provided by an embodiment of the present application. Fig. 3A-3C also illustrate the electrical connection of the tab assembly 400 to the battery protection plate 320. The view shown in fig. 3B can be obtained by viewing the tab assembly 400 and the battery protection plate 320 according to the X direction shown in fig. 3A. Viewing the tab assembly 400 and the battery protection plate 320 from thebase:Sub>A-base:Sub>A section shown in fig. 3A,base:Sub>A viewbase:Sub>A-base:Sub>A shown in fig. 3C can be obtained.
The tab assembly 400 may include a first tab 410 and a second tab 420. The battery protection plate 320 may include a first protection plate pin 322, a second protection plate pin 323. The first protection plate pin 322 may be electrically connected with the first tab 410. The first end 412 of the first tab 410 may be disposed on the first guard plate pin 322. As shown in fig. 3C, the first end surface 414 of the first tab 410 may be connected to the first protection plate pin 322. The second protective plate pins 323 may be electrically connected with the second pole ears 420. The first ends 421 of the second pole ears 420 may be disposed on the second guard plate pins 323. As shown in fig. 3C, the first end surfaces 423 of the second pole ear 420 may be connected to the second shield pins 323. The end face of the component may refer to a surface of the component that is disposed parallel to the battery protection plate 320 or pole piece. The side surface of the component may refer to a surface of the component that is disposed perpendicularly with respect to the battery protection plate 320 or pole piece, or may refer to a surface located between two end surfaces of the component.
The first tab 410 may be a positive or negative tab to serve as a positive or negative electrode of the battery; accordingly, the first protection plate pin 322 may be a positive electrode pin or a negative electrode pin. The second tab 420 may be a reference electrode tab to serve as a reference electrode for the battery; accordingly, the second protective plate pin 323 may be a reference electrode pin.
In the example shown in fig. 3A-3C, the first tab 410 and the second tab 420 may be both elongated. The first tab 410 and the second tab 420 may be disposed in parallel with each other. The first tab 410 and the second tab 420 may be spaced apart from each other.
The tab assembly 400 may further include an insulating member 430 positioned between the first tab 410 and the second tab 420. The insulating member 430 may be attached between the first and second tabs 410 and 420 and fill a space between the first and second tabs 410 and 420. The insulating member 430 may serve to block a short circuit between the first tab 410 and the second tab 420.
The insulating member 430 may include a first portion 433 and a second portion 434. The first portion 433 of the insulating member 430 and the second portion 434 of the insulating member 430 may be disposed perpendicular to each other. The first portion 433 of the insulating member 430 may be disposed in a stack with the first tab 420. The first end 435 of the first portion 433 can be attached to the second end 424 of the second ear 420. The second end surface 424 of the second pole ear 420 can be disposed opposite the first end surface 423 of the second pole ear 420. The second portion 434 of the insulating member 430 may be attached between the first and second tabs 410 and 420 and between adjacent two sides of the first and second tabs 410 and 420.
To reduce the likelihood of shorting the first tab 410 to the second tab 420, the insulating member 430 may protrude out of the spacing space between the first tab 410 and the second tab 420. In the example shown in fig. 3A to 3C, the first tab 410, the insulating member 430, and the second tab 420 may be arranged in a direction in which they are disposed in parallel with respect to the battery protection plate 320. The extending directions of the first tab 410, the insulating member 430, and the second tab 420 may be perpendicular to the extending direction of the battery protection plate 320.
The materials of the first tab 410 and the second tab 420 may be the same or different. The material of the first and second tabs 410, 420 may be one or more of the following: li, al, ni, cu, sn, au and alloys of the foregoing metals (e.g., active materials having stable discharge properties such as Li) 4 Ti 5 O 12 ). The material of the second tab 420 may react relatively more readily with the material in the electrolyte. In one example, the first tab 410 may be an anode tab. The material of the first tab 410 may be relatively stable and relatively difficult to decompose by the material in the electrolyte. The material of the first tab 410 may be graphite, si, etc. In another example, the first tab 410 may be a positive tab. The material of the first tab 410 may react with the electrolyte. The material of the first tab 410 may be lithium cobaltate or the like.
The material of the insulating member 430 may include, for example, polypropylene (PP), polyimide (PI), ceramic, and the like. Optionally, the material of the insulating member 430 may further include epoxy resin, acrylic resin, or the like to improve the sealability of the insulating member 430.
In the example shown in fig. 3A, 3C, the thickness of the second tab 420 may be less than the thickness of the insulating member 430 (the thickness of the member may refer to a dimension of the member in a direction perpendicular to the battery protection plate 320), and the thickness of the insulating member 430 may be substantially the same as the thickness of the first tab 410. The first end surface 414 of the first tab 410 may be flush with the first end surface 423 of the second tab 420. The insulating member 430 may be attached to a side of the first tab 410 close to the second tab 420, and the insulating member 430 may further wrap the second end face 424 of the second tab 420 (the first end face 423 of the second tab 420 and the second end face 424 of the second tab 420 may be respectively located at two sides of the second tab 420), and a side of the second tab 420 close to the first tab 410.
In another example, the thickness of the second tab 420 may be greater than the thickness of the first tab 410. The first end surface 414 of the first tab 410 may be flush with the first end surface 423 of the second tab 420. The insulating member 430 may wrap the second end surface 415 of the first tab 410 (the first end surface 414 of the first tab 410 and the second end surface 415 of the first tab 410 may be respectively located at two sides of the first tab 410), and a side surface of the first tab 410 close to the second tab 420, and may further attach a side surface of the second tab 420 close to the first tab 410.
As shown in fig. 3A-3C, the first tab 410 may include a battery connection region 411. The cell connection region 411 may be located at the second end 413 of the first tab 410, i.e., at the end of the first tab 410 remote from the cell protection plate 320. The cell connection region 411 may be located at the second end surface 415 of the first tab 410 (the first end surface 414 of the first tab 410, the second end surface 415 of the first tab 410 may be located at both sides of the first tab 410, respectively). The battery connection area 411 may be used for connection to a pole piece.
Optionally, the tab assembly 400 may further include a tab glue 440. A tab glue 440 may surround the outer circumferences of the first tab 410, the second tab 420, and the insulating member 430. As shown in fig. 3A and 3C, the tab glue 440 may be in sealing contact with the side of the first tab 410 away from the second tab 420, and with the first and second end surfaces 414, 415 of the first tab 410. The tab glue 440 may also be in sealing contact with the side of the second tab 420 remote from the first tab 410, as well as the first end face 423 of the second tab 420. The tab jelly 440 may also be in sealing contact with both end surfaces of the insulating member 430, which are flush with the first end surface 313 and the second end surface 415 of the first tab 410, respectively, and the tab jelly 440 may also be in sealing contact with the side surface of the insulating member 430 remote from the first tab 410.
With reference to fig. 3A-3C and fig. 4, tab glue 440 may be used to connect and seal with cell casing 312 of cell 310, so that the tightness of cell casing 312 may be relatively good around tab assembly 400.
Fig. 4 is a schematic structural diagram of a battery cell 310 according to an embodiment of the present application. The cell 310 shown in fig. 4 may correspond to the cell 310 shown in fig. 1 and 2. As shown in fig. 4, the battery cell 310 may include a first pole piece 3111, a second pole piece 3112, a diaphragm 3113 (as shown in fig. 4 with a blank pattern of geometry), a cell casing 312, an electrolyte 316 (as shown in fig. 4 with a dot pattern of geometry), a tab assembly 400, and a third tab 315. The first pole piece 3111, the second pole piece 3112, the separator 3113, and the electrolyte 316 may be housed in the cell casing 312. One of the first and second pole pieces 3111 and 3112 may be a positive pole piece, and the other may be a negative pole piece.
The positive pole piece and the negative pole piece can be used for extracting metal ions (such as lithium ions) so as to realize the storage and release of energy. The positive pole piece and the negative pole piece are main energy storage parts of the battery cell 310, and can reflect energy density, cycle performance and safety performance of the battery cell 310. The electrolyte 316 can be a transport carrier of metal ions between the positive electrode plate and the negative electrode plate. A separator 3113 may be filled between the positive electrode sheet and the negative electrode sheet disposed at intervals. The separator 3113 is permeable to metal ions, but the separator 3113 itself is non-conductive, so that the separator 3113 can separate the positive electrode tab from the negative electrode tab to prevent short circuit between the positive electrode tab and the negative electrode tab.
The positive electrode sheet may include a positive electrode current collector and a positive electrode coating layer, and the positive electrode coating layer may be a positive electrode material coated on the positive electrode current collector. The negative electrode tab may include a negative electrode current collector and a negative electrode coating layer, and the negative electrode coating layer may be a negative electrode material coated on the negative electrode current collector.
The tab assembly 400 may be located between the first pole piece 3111 and the membrane 3113. The battery connection region 411 of the first tab 410 shown in fig. 3A-3C may be connected to the first pole piece 3111, for example, by welding or the like, so that the first tab 410 may be electrically connected to the first pole piece 3111. In the case where the first tab 410 is a positive electrode tab, the first pole piece 3111 may be a positive electrode piece. In the case where the first tab 410 is a negative tab, the first pole piece 3111 may be a negative pole piece. An end surface of the insulating member 430 remote from the second pole piece 3112 (or an end surface of the insulating member 430 flush with the second end surface 415 of the first pole tab 410) may be affixed to the first pole piece 3111. The second tab 420 of the tab assembly 400 may be located on a side of the insulating member 430 remote from the first pole piece 3111.
A third tab 315 may be disposed on the second pole piece 3112 of the cell 310 between the second pole piece 3112 and the membrane 3113. The second pole piece 3112 may be electrically connected to the third pole ear 315. Wherein, a third tab 315 may be disposed on the current collector of the second pole tab 3112. The second diode 3112 may be located on one side of the coating of the second diode 3112, or may be located in an area surrounded by the coating of the second diode 3112.
Optionally, the battery may further include an insulating sheet 3115. An insulation sheet 3115 may be attached to one side of the tab (e.g., the tab assembly 400 or the third tab 315) adjacent to the separator 3113 and between the tab and the separator 3113. The insulating rubber sheets 3115 can be beneficial to reducing the rubbing of the diaphragms by the lugs.
As shown in fig. 4, an insulating film 3115 may be attached to the side of the first tab 410 away from the second pole piece 3112 and the first end face 414 of the first tab 410, the side of the second tab 420 away from the first pole piece 3111 and the first end face 423 of the second tab 420, or the end face of the insulating member 430 away from the first pole piece 3111.
As shown in a partially enlarged view of fig. 4, the insulating film 3115 may be a film having a plurality of holes, for example. The porous film advantageously increases the wetting of the second tab 420 with the electrolyte 316.
In the example shown in fig. 3A-3C, 4, the reference electrode may be served by the second tab 420 of the tab assembly 400. Unlike other types of conductive devices (e.g., wires), since most of the battery cells 310 have tabs, adding new tabs to the battery cells 310 is relatively easy to be compatible with the existing battery cells 310. Once the tabs are secured to the cell casing 312, the position, shape, etc. of the tabs are generally relatively stable. Compared with other types of conductive pieces, the tab is beneficial to considering both the mechanical performance and the usability of the battery cell 310. The reference electrode tab and the positive electrode tab, or the reference electrode tab and the negative electrode tab, may be relatively closely combined together by the insulating member 430. Therefore, the tab assembly 400 is disposed at a position where a tab is originally to be disposed, which is beneficial to both a large current scenario of the battery 30 and an occupied space of the battery 30.
Fig. 5A-5C show a schematic structural diagram of a tab assembly 400 provided in an embodiment of the present application. Fig. 5A-5C also illustrate the electrical connection of the tab assembly 400 to the battery protection plate 320. The view shown in fig. 5B can be obtained by viewing the tab assembly 400 and the battery protection plate 320 from the X direction shown in fig. 5A. The view B-B shown in fig. 5C can be obtained by observing the tab assembly 400 and the battery protection plate 320 with reference to the section B-B shown in fig. 5A.
Similar to the tab assembly 400 shown in fig. 3A-3C, the tab assembly 400 shown in fig. 5A-5C may include a first tab 410, a second tab 420, and an insulating member 430 positioned between the first tab 410 and the second tab 420. The second tab 420 may have a long bar shape. The first end surface 414 of the first tab 410 may be electrically connected with the first protection plate pin 322 of the battery protection plate 320. The first end surfaces 423 of the second pole ears 420 may be electrically connected with the second protective plate pins 323 of the battery protective plate 320. View B-B in fig. 5C shows a schematic structural view of the tab assembly 400 and the battery protection plate 320 at a section B-B shown in fig. 5A.
The tab assembly 400 shown in fig. 5A-5C is different from the tab assembly 400 shown in fig. 3A-3C. The first tab 410 shown in fig. 5A-5C may have a stepped shape instead of a long strip shape.
As shown in fig. 5A and 5C, the thickness of the first tab 410 may be greater than that of the insulating member 430, and the thickness of the insulating member 430 may be greater than that of the second tab 420. The first end surface 414 of the first tab 410 may be flush with the first end surface 423 of the second tab 420. The first tab 410 may have a stepped structure, which may be formed of a stepped end surface and a stepped side surface. The stepped end surface of the first tab 410 may be disposed in parallel with respect to the first end surface 414 of the first tab 410 and between the first end surface 414 of the first tab 410 and the second end surface 415 of the first tab 410. The step side of the first tab 410 may be connected between the step end surface and the first end surface 414 of the first tab 410.
One side of the insulating member 430 may wrap the side of the second pole ear 420 near the first pole ear 410 and the second end face 424 of the second pole ear 420. The other side of the insulating member 430 may be in contact with the stepped side surface and the stepped end surface of the first tab 410. That is, the stepped structure of the first tab 410 may wrap a portion of the surface of the insulating member 430.
The step structure of the first tab 410 may divide the first tab 410 into a first part 4101 and a second part 4102. The first portion 4101 of the first tab 410 and the second portion 4102 of the first tab 410 may be disposed perpendicular to each other. The first portion 4101 of the first tab 410 may be disposed to be laminated with the first portion 433 of the insulating member 430. The first portion 4101 may be attached on the second end 436 of the insulating member 430. The second end surface 436 of the insulating member 430 may be disposed opposite the first end surface 435 of the insulating member 430. The second portion 4102 of the first tab 410 may be attached to the second portion 434 of the insulating member 430. The second portion 4102 of the first tab 410 may be attached to the side of the insulating member 430 remote from the second tab 420.
Optionally, the tab assembly 400 may further include a tab glue 440. A tab glue 440 may surround the outer circumferences of the first tab 410, the second tab 420, and the insulating member 430. As shown in fig. 5A and 5C, the tab adhesive 440 may be in sealing contact with two sides of the first tab 410, one of which is away from the second tab 420 and the other of which is flush with the side of the second tab 420, the two sides being arranged parallel to each other; the tab compound 440 may also be in sealing contact with the first and second end surfaces 414, 415 of the first tab 410. The tab glue 440 may also be in sealing contact with the side of the second tab 420 remote from the first tab 410, as well as the first end face 423 of the second tab 420. The tab glue 440 may also be in sealing contact with an end surface of the insulating member 430 that is flush with the first end surface 313 of the first tab 410, and the tab glue 440 may also be in sealing contact with a side surface of the insulating member 430 that is remote from the first tab 410. With reference to fig. 5A-5C and fig. 6, tab adhesive 440 may be used to couple and seal with cell casing 312 of cell 310, so that the tightness of cell casing 312 may be relatively good around tab assembly 400.
In the example shown in fig. 5A to 5C, the first tab 410 has a stepped structure, which may mean that the cathode tab or the anode tab has a stepped structure. In other examples, the reference electrode tab may also have a stepped structure.
For example, the thickness of the first tab 410 may be less than the thickness of the insulating member 430, and the thickness of the insulating member 430 may be less than the thickness of the second tab 420. The first end surface 414 of the first tab 410 may be flush with the first end surface 423 of the second tab 420. The second pole ear 420 may have a stepped structure, which may be formed by a stepped end face and a stepped side face. The stepped end surface of the second pole ear 420 may be disposed in parallel with respect to the first end surface 423 of the second pole ear 420 and between the first end surface 423 of the second pole ear 420 and the second end surface 424 of the second pole ear 420. The step side of the second pole ear 420 can be connected between the step end face and the first end face 423 of the second pole ear 420. One side of the insulating member 430 may wrap the side of the first tab 410 adjacent to the second tab 420 and the second end face 415 of the first tab 410. The other side of the insulating member 430 may contact the stepped side surface and the stepped end surface of the second pole lug 420. That is, the stepped structure of the second pole ear 420 may wrap a portion of the surface of the insulating member 430.
Fig. 6 is a schematic structural diagram of a battery cell 310 according to an embodiment of the present application. Slightly different from the structure of the cell 310 shown in fig. 4, the cell 310 shown in fig. 6 includes the tab assembly 400 shown in fig. 5A-5C. The specific structure of the battery cell 310 shown in fig. 6 may refer to the embodiment shown in fig. 4.
The embodiment shown in fig. 5A-5C, 6 may have a larger area of the second end surface 415 of the first tab 410 than the embodiment shown in fig. 3A-3C, 4. The area of the battery connection region 411 of the first tab 410 for connection with a pole piece can be larger. This is beneficial to reducing the impedance of the battery and improving the charging and discharging efficiency of the battery.
Fig. 7A to 7C show schematic structural views of a tab assembly 400 provided in an embodiment of the present application. Fig. 7A-7C also illustrate the electrical connection of the tab assembly 400 to the battery protection plate 320. The structure of the battery protection sheet 320 shown in fig. 7A to 7C can refer to the structure of the battery protection sheet 320 shown in fig. 3A to 3C or fig. 5A to 5C. The view shown in fig. 7B can be obtained by viewing the tab assembly 400 and the battery protection plate 320 from the X direction shown in fig. 7A. Viewing the tab assembly 400 and the battery protection plate 320 from the C-C section shown in fig. 7A, a C-C view shown in fig. 7C can be obtained.
Similar to the tab assembly 400 shown in fig. 3A-3C and 5A-5C, the tab assembly 400 shown in fig. 7A-7C may include a first tab 410, a second tab 420, and an insulation member 430 applied between the first tab 410 and the second tab 420. Unlike the tab assembly 400 shown in fig. 3A to 3C and 5A to 5C, the first tab 410, the second tab 420, and the insulating member 430 shown in fig. 7A to 7C may be arranged in a direction perpendicularly disposed with respect to the battery protection plate 320. In the tab assembly 400 shown in fig. 7A-7C, the first tab 410, the second tab 420, and the insulating member 430 may be layered. The body portion of the first tab 410, the body portion of the insulating member 430, and the body portion of the second tab 420 may be sequentially stacked. The first tab 410 may have a long bar shape, for example. The second pole ear 420 may be L-shaped, for example. That is, at the first end 421 of the second tab 420, the second tab 420 may include an extension 425, and the extension 425 may be perpendicularly disposed with respect to the extension direction of the first tab 410 and extend in a direction away from the body of the first tab 410. The extending direction of the first tab 410 refers to the extending direction of the main body of the first tab 410, corresponding to the direction from the battery protection plate 320 to the battery cell 400, or the direction from the battery cell 400 to the battery protection plate 320. The main body of the first tab 410 may be perpendicularly disposed with respect to the battery protection plate 320.
The first end 412 of the first tab 410 may be disposed on the first protection plate pin 322 of the battery protection plate 320. The first tab 410 may include a first end face 414. The first end surface 414 of the first tab 410 may be connected to the first protection plate pin 322 of the battery protection plate 320. The first tab 410 may have a cell connection area 411 on a second end 413 of the first tab 410. The battery connection region 411 may be connected to a first pole piece 3111 of the battery cell 310, so that the first pole tab 410 may be electrically connected to the first pole piece 3111. The battery connection region 411 may be located on the first end surface 414 of the first tab 410. That is, both ends of the same end surface of the first tab 410 may be connected to the pole piece and the battery protection plate 320, respectively, so that the first tab 410 may be electrically connected between the battery cell and the battery protection plate 320.
The first tab 410 may also include a second end surface 415. The second end surface 415 of the first tab 410 may be in contact with the insulating member 430.
The second ear 420 can include a first end face 423 and a second end face 424. The first end surface 423 of the second pole ear 420 and the second end surface 424 of the second pole ear 420 can be located on the same side of the second pole ear 420.
The first end surface 423 of the second tab 420 may be substantially flush with the first end surface 414 of the first tab 410. The first end surfaces 423 of the second ears 420 may be connected to the second protector plate pins 323 of the battery protector plate 320. The first end surface 423 of the second pole ear 420 is located at the extension 425 of the second pole ear 420. As shown in fig. 7A-7C, the first end 421 of the second pole ear 420 may be disposed on the second shield pin 323 of the battery shield 320. The first end 421 of the second tab 420 may be located at the same end of the tab assembly 400 as the first end 412 of the first tab 410.
The second end 424 of the second pole ear 420 can be in contact with the insulating member 430. The second end surface 424 of the second pole ear 420 can be located outside of the extension 425 of the second pole ear 420.
In the example shown in fig. 7A-7C, the side of the first tab 410 adjacent to the battery protection plate 320 may be flush with the side of the second tab 420 adjacent to the battery protection plate 320. The side of the insulating member 430 remote from the battery protection plate 320 may be located between the side of the first tab 410 remote from the battery protection plate 320 and the side of the second tab 420 remote from the battery protection plate 320. The insulating member 430 may slightly protrude out of the space between the first tab 410 and the second tab 420, which is advantageous in reducing the probability of the first tab 410 and the second tab 420 being short-circuited.
Optionally, the tab assembly 400 may further include a tab glue 440. A tab glue 440 may surround the outer circumferences of the first tab 410, the second tab 420, and the insulating member 430. As shown in fig. 7A-7C, the tab glue 440 may be in sealing contact with both side surfaces of the first tab 410, and the tab glue 440 may also be in sealing contact with the first end surface 414 of the first tab 410. The tab glue 440 may also be in sealing contact with both sides of the second tab 420, as well as the end surface of the second tab 420 distal from the first tab 410. The tab jelly 440 may also be in sealing contact with both side surfaces of the insulating member 430. With reference to fig. 7A-7C and 8, tab adhesive 440 may be used to couple and seal with cell casing 312 of cell 310, so that the tightness of cell casing 312 may be relatively good around tab assembly 400.
Fig. 8 is a schematic structural diagram of a battery cell 310 provided in an embodiment of the present application. Similar to the cell 310 of fig. 4, the cell 310 of fig. 8 may include a first pole piece 3111, a second pole piece 3112, a separator 3113, and an electrolyte 316. One of the first and second pole pieces 3111 and 3112 may be a positive pole piece, and the other may be a negative pole piece.
The cell 310 shown in fig. 8 may further include the tab assembly 400 shown in fig. 7A-7C, as well as the third tab 315. In the case where the first tab 410 in the tab assembly 400 is a positive tab, the third tab 315 may be a negative tab. In the case where the first tab 410 in the tab assembly 400 is an anode tab, the third tab 315 may be a cathode tab.
The tab assembly 400 may be disposed between the first pole piece 3111 and the membrane 3113 of the cell 310. The battery connection region 411 of the first tab 410 shown in fig. 7A to 7C may be connected to the first pole piece 3111 so that the first tab 410 may be electrically connected to the first pole piece 3111. The second tab 420 may be located at a side of the first tab 410 adjacent to the separator 3113.
The battery cell 310 may further include an insulating rubber sheet 3115. An insulating rubber sheet 3115 may be located between the tab assembly 400 and the separator 3113. As shown in fig. 4, an insulating sheet 3115 may be attached to both sides of the first tab 410, both sides of the insulating member 430, both sides of the second tab 420, and an end surface of the second tab 420 remote from the first pole piece 3111. In one possible example, the insulating film 3115 may be a film with multiple holes, for example.
A third tab 315 may be disposed on the second pole piece 3112 of the cell 310 between the second pole piece 3112 and the membrane 3113. The third tab 315 may be disposed in the battery cell 310 in a manner similar to that of the third tab 315 in the battery cell 310 shown in fig. 4.
Fig. 9 shows a schematic structural view of another possible tab assembly 400. Referring to fig. 7A to 7C, the structure of the tab assembly 400 shown in fig. 9 may be applied to the battery cell 310 shown in fig. 8.
In the tab assembly 400 shown in fig. 7A-7C, both the second tab 420 and the insulating member 430 may be located between the electrical connection region 411 and the battery protection plate 320. That is, the second pole ear 420 and the insulating member 430 may be located on the same side of the electrical connection region 411. The second end 422 of the second tab 420 may be spaced from the electrical connection region 411 by a distance greater than the distance from the end of the insulating member 430 near the electrical connection region 411 to the electrical connection region 411. The electrical connection region 411 of the first tab 410 may protrude with respect to the insulating member 430, and one end of the insulating member 430 near the electrical connection region 411 may protrude with respect to the second end 422 of the second tab 420. In the tab assembly 400 shown in fig. 9, the first and second tabs 410 and 420 may be layered. The insulating member 430 may have a boss 431 at the second end 422 near the second pole ear 420. The second end 422 of the second pole ear 420 may be disposed away from the second protective plate pin 323 of the battery protective plate 320, near the pole piece of the cell 310. The protrusion 431 may protrude in a direction perpendicular to the second pole ear 420 toward a direction close to the second pole ear 420. The insulating member 430 can be wrapped around the second end 422 of the second pole ear 420 by providing a raised portion 431 on the insulating member 430.
Fig. 10A to 10C are schematic structural views of a tab assembly 400 provided in an embodiment of the present application. Fig. 10A-10C also illustrate the electrical connection of the tab assembly 400 to the battery protection plate 320. The structure of the battery protection sheet 320 shown in fig. 10A to 10C can refer to the structure of the battery protection sheet 320 shown in fig. 3A to 3C or fig. 5A to 5C. Viewing the tab assembly 400 from the X direction shown in fig. 10A, the view shown in fig. 10B can be obtained. Viewing the tab assembly 400 from the D-D cross-section shown in fig. 10B, the D-D view shown in fig. 10 may be obtained.
Similar to the tab assembly 400 shown in fig. 7A-7C, the tab assembly 400 shown in fig. 10A-10C may be provided on the battery protection plate 320 shown in fig. 7A-7C. The tab assembly 400 shown in fig. 10 is slightly different from the tab assembly 400 shown in fig. 7A-7C. As shown in fig. 10A and 10B, the side of the second tab 420 facing away from the battery protection plate 320, and the side of the insulating member 430 facing away from the battery protection plate 320 may be flush with the side of the first tab 410 facing away from the battery protection plate 320.
As shown in fig. 10C, the second tab 420 may include a first through-hole 426. The insulating member 430 may include a second through hole 432. The first through-hole 426 and the second through-hole 432 may communicate with each other. The position of the first through-hole 426 on the second tab 420 and the position of the second through-hole 432 on the insulating member 430 may be opposite to the cell connection region 411 of the first tab 410. The first through hole 426 and the second through hole 432 may be used to extend into the welding fixture, so that the welding fixture may clamp both sides of the electrical connection region 411, which is beneficial to improving the processing convenience of the electrical connection region 411.
Fig. 11A to 11F are schematic structural views of a tab assembly 400 provided in an embodiment of the present application. Fig. 11A-11D also illustrate the electrical connection of the tab assembly 400 to the battery protection plate 320. The view shown in fig. 11B can be obtained by viewing the tab assembly 400 and the battery protection plate 320 from the X direction shown in fig. 11A. The view shown in fig. 11C can be obtained by viewing the tab assembly 400 and the battery protection plate 320 from the direction opposite to the X direction shown in fig. 11A. Viewing the tab assembly 400 and the battery protection plate 320 from the E-E section shown in fig. 11A, a view E-E shown in fig. 11D can be obtained. Fig. 11E illustrates a schematic structural view of the tab assembly 400 shown in fig. 11A. Viewing the tab assembly 400 from the F-F cross-section shown in fig. 11E, the F-F view shown in fig. 11F can be obtained.
Similar to the tab assembly 400 shown in fig. 7A-7C, the tab assembly 400 shown in fig. 11A-11F may include a first tab 410, a second tab 420, and an insulating member 430 applied between the first tab 410 and the second tab 420. The first tab 410, the second tab 420, and the insulating member 430 may be arranged in a direction perpendicularly disposed with respect to the first tab 410. The second tab 420 may include an extension 425, and the extension 425 may be perpendicularly disposed with respect to an extension direction of the first tab 410 and extend away from the first tab 410. The manner in which the tab assembly 400 shown in fig. 11A to 11F is disposed in the battery cell 310 may refer to the example shown in fig. 8.
With reference to fig. 8 and 11A-11F, the side of the first tab 410 away from the pole piece may not be flush with the side of the second tab 420 away from the pole piece. A portion of the first tab 410 away from the pole piece (e.g., the first end 412 of the first tab 410) may be bent and turned over, so that the first pole piece 3111 is wound from one side of the battery protection plate 320 to the other side of the battery protection plate 320.
The first tab 410 may include a first region 417, a second region 418, and a third region 419. The second region 418 of the first tab 410 may be connected between the first region 417 of the first tab 410 and the third region 419 of the first tab 410. As shown in fig. 11A, both the first region 417 of the first tab 410 and the third region 419 of the first tab 410 may be disposed in parallel with respect to the battery protection plate 320. The first region 417 of the first tab 410 may be disposed adjacent to the first protection plate end surface 3211 of the battery protection plate 320. The third region 419 of the first tab 410 may be disposed adjacent to the second protective plate end surface 3212 of the battery protective plate 320. The first protective plate end surface 3211 and the second protective plate end surface 3212 may be two end surfaces of the battery protective plate 320 that are parallel to each other.
Optionally, the tab assembly 400 may also include a tab glue 440 similar to the example shown in fig. 7A-7C. A tab glue 440 may surround the outer circumferences of the first tab 410, the second tab 420, and the insulating member 430.
As shown in fig. 11A to 11F, the battery protection plate 320 may include a first protection plate pin 322, a second protection plate pin 323. The first guard plate pin 322 may be located at the first guard plate end surface 3211, and the second guard plate pin 323 may be located at the second guard plate end surface 3212. The first protective plate pin 322 and the second protective plate pin 323 may be located at one side of the battery protective plate 320 adjacent to the tab assembly 400 to facilitate the coupling of the tab assembly 400 to the battery protective plate 320. The first protection plate pin 322 and the second protection plate pin 323 are staggered from each other in a direction perpendicular to the extending direction of the tab assembly 400. This is advantageous in reducing the probability of a short circuit between the first tab 410 and the second tab 420.
The first end 412 of the first tab 410 may protrude with respect to the insulating member 430. An end of the insulating member 430 remote from the electrical connection region 411 may protrude with respect to the first end 421 of the second pole ear 420.
The first region 417 of the first tab 410 may be connected to the first protection plate pin 322 of the battery protection plate 320 so that the first tab 410 may be electrically connected to the battery protection plate 320.
The second tab 420 may be located between the third region 419 of the first tab 410 and the battery protection plate 320. The extension 425 of the second tab 420 may be coupled to the second protective plate pin 323 of the battery protective plate 320 so that the second tab 420 may be electrically connected to the battery protective plate 320.
The second region 418 of the first tab 410 may be relatively closer to the side of the battery protection plate 320 away from the pole piece. Also, the side of the second pole ear 420 away from the pole piece may be flush with the side of the battery protection plate 320 away from the pole piece. The second region 418 of the first tab 410 may come into contact with the second tab 420. To reduce the likelihood of a short circuit between the first tab 410 and the second tab 420, the side of the insulating member 430 remote from the pole pieces may protrude through the spacing space between the first tab 410 and the second tab 420. As shown in fig. 11C, an insulating member 430 may cover the side of the second pole ear 420 remote from the pole piece.
In the example shown in fig. 11A-11F, the end of the insulating member 430 distal to the pole piece can be located between the second pole ear 420 and the battery protection plate 320. That is, the second pole ear 420 may not contact the second protection plate end surface 3212 of the battery protection plate 320. In another example, an end of the insulating member 430 remote from the pole piece may also protrude with respect to the battery protection plate 320. For example, the insulating member 430 may cover the side of the battery protection plate 320 remote from the pole piece. That is, the insulating member 430 may be located between the first tab 410 and the side of the battery protection plate 320 remote from the pole piece.
The distance by which the first tab 410 and the insulating member 430 protrude with respect to the second tab 420 will be explained below by way of example shown in fig. 11A to 11F. As shown in fig. 11B, 11D, and 11F, the distance between the side of the insulating member 430 far from the pole piece and the side of the second pole ear 420 far from the pole piece may be a distance D 1 The distance between the side of the first tab 410 away from the pole piece and the side of the second tab 420 away from the pole piece may be a distance d 2 。d 2 >d 1 . The distance between the side of the insulating member 430 facing away from the pole piece and the side of the first tab 410 facing away from the pole piece may be d 2 -d 1 . As can be seen from the examples shown in FIGS. 11A-11F, d 1 >t 1 ；d 2 >3*t 2 +t 1 + h, wherein, t 1 May be the thickness of the second pole ear 420; t is t 2 May be the thickness of the insulating member 430 and h may be the total thickness of the battery protection plate 320, which may be, for example, the sum of the thickness of the first protection plate pin 322, the thickness of the second protection plate pin 323, and the thickness of the protection plate base. In one example, t 1 +h≥d 1 >t 1 ；d 2 ≈3*t 2 +t 1 + h + s, s may be the width of the first guard plate pin 322.
In the examples shown in fig. 4, 6, and 8, the cell 310 may include one reference electrode. In other examples, the cell 310 may include two reference electrodes. For example, the cell 310 may include two tab assemblies 400. The first tab 410 of one tab assembly 400 may be a positive electrode tab, and the first tab 410 of the other tab assembly 400 may be a negative electrode tab.
Fig. 12A-12B are schematic structural diagrams of a circuit board 500 according to an embodiment of the present disclosure. Fig. 12A-12B also illustrate one possible connection of the circuit board 500 to the battery protection plate 320. Viewing the tab assembly 400 in accordance with the G-G section shown in fig. 12A, a G-G view shown in fig. 12B can be obtained. The circuit board 500 may serve as a plurality of electrodes of the battery, such as a positive electrode and a reference electrode, or a negative electrode and a reference electrode.
The circuit board 500 may be, for example, a flexible circuit board. The circuit board 500 may be L-shaped, for example. The circuit board 500 may include a first portion 501 and a second portion 502. The first portion 501 of the circuit board 500 may be vertically disposed with respect to the battery protection plate 320. The second portion 502 of the circuit board 500 may be disposed in parallel with respect to the battery protection plate 320.
The circuit board 500 may include a plurality of conductive layers, a plurality of insulating layers. And a conductive layer is arranged between two adjacent insulating layers. An insulating layer is arranged between two adjacent conductive layers. The plurality of conductive layers may include, for example, a first conductive layer 510, a second conductive layer 520. The plurality of insulating layers may include, for example, a first insulating layer 531, a second insulating layer 532, and a third insulating layer 533. The first insulating layer 531 may be located on a side of the first conductive layer 510 away from the second conductive layer 520. A second insulating layer 532 is located between the first conductive layer 510 and the second conductive layer 520. The third insulating layer 533 may be located on a side of the second conductive layer 520 away from the first conductive layer 510.
The material of the conductive layer may be a conductive material such as a metal. The material of the conductive layer may include, for example, gold, silver, copper, aluminum, tin, and gold alloy, silver alloy, copper alloy, aluminum alloy, tin alloy, and the like. The material of the insulating layer may include, for example, polypropylene (PP), polyimide (PI), ceramic, and the like. Optionally, the material of the insulating layer may further include epoxy resin, acrylic resin, or the like, so as to improve the sealing property of the insulating layer.
The circuit board 500 is provided with a first circuit and a second circuit, and the first circuit may be a positive circuit or a negative circuit. The second line may be a reference electrode line. The first line may be formed of a part of the first conductive layer 510, for example. The second line may, for example, pass through the first conductive layer 510, the second insulating layer 532 (e.g., by way of a via, etc.), and be formed by at least a portion of the second conductive layer 520.
The circuit board 500 may further include a first electrical connector 511, a second electrical connector 512, a third electrical connector, and a fourth electrical connector.
The first electrical connector 511 and the second electrical connector 512 can be electrically connected to a first circuit on the circuit board 500. The first electrical connector 511 and the second electrical connector 512 may be located on the first portion 501 of the circuit board 500. The first electrical connector 511 may be located at an end of the circuit board 500 near the battery protection board 320. The second electrical connector 512 may be located at an end of the circuit board 500 away from the battery protection board 320.
The first electrical connection member 511 and the second electrical connection member 512 may be embedded in the through hole of the first insulating layer 531. For example, first insulating layer 531 may include first insulating via 534, and first electrical connection 511 may be buried within first insulating via 534; the first insulating layer 531 may include a second insulating via 535, and the second electrical connector 512 may be embedded in the second insulating via 535.
The third electrical connector 521 and the fourth electrical connector 522 can be electrically connected to the second circuit on the circuit board 500. A third electrical connector 521 may be located at the second portion 502 of the circuit board 500. The third electrical connector 521 may be located at an end of the circuit board 500 near the battery protection plate 320. The fourth electrical connector 522 may be located at the first portion 501 of the circuit board 500. The fourth electrical connector 522 may be located at an end of the circuit board 500 away from the battery protection plate 320.
The third electrical connection 521 may be embedded in a through hole on the first insulating layer 531. For example, the first insulating layer 531 may include a third insulating via 536, and the third electrical connection 521 may be embedded in the third insulating via 536. The fourth electrical connector 522 may be embedded in a via on the third insulating layer 533. For example, the third insulating layer 533 may include a fourth insulating via 537, and the fourth electrical connector 522 may be embedded in the fourth insulating via 537.
In the example shown in fig. 12A-12B, the second electrical connectors 512 and the fourth electrical connectors 522 may be staggered with respect to each other or disposed opposite to each other. The second electrical connector 512 and the fourth electrical connector 522 may be disconnected by an insulating layer within the circuit board 500. For example, the projection area of the second electrical connector 512 on the second insulating layer 532 is a first projection area, the projection area of the fourth electrical connector 522 on the second insulating layer 532 is a second projection area, and the first projection area and the second projection area may be mutually staggered. When the second electrical connector 512 is soldered to the tab, the soldering energy may penetrate the insulating layer, which may increase the likelihood of shorting the first and second traces if the second and fourth electrical connectors 512, 522 are aligned.
The materials of the second electrical connector 512 and the fourth electrical connector 522 can be the same or different. The materials of the second and fourth electrical connectors 512 and 522 may be one or more of the following: li, al, ni, cu, sn, au, and alloys of the foregoing metals (e.g., active materials having a stable discharge property such as Li 4 Ti 5 O 12 ). In one example, the material of the second electrical connection 512 may be relatively stable and relatively difficult to decompose by the material in the electrolyte. The material of the fourth electrical connection 522 may react relatively more easily with the material in the electrolyte.
Alternatively, as shown in fig. 12A-12B, a circuit board gel 540 may be disposed around the periphery of the circuit board 500. Referring to fig. 13, a circuit board colloid 540 is used to seal the circuit board 500 on the cell casing 312 of the cell 310, so that the cell casing 312 may have relatively good sealing performance around the circuit board 500. In one example, the material of the circuit board gel 540 may be the same as or different from the material of the insulating layer of the circuit board 500. As shown in fig. 12A-12B, the circuit board colloid 540 may be in sealing contact with the first insulating layer 531 and the third insulating layer 533 to prevent the electrolyte of the battery cell 310 from leaking. Optionally, the material of the circuit board colloid 540 may be modified PI, and the materials of the first insulating layer 531 and the third insulating layer 533 may be PI.
Fig. 13 is a schematic structural diagram of a battery cell 310 according to an embodiment of the present application. Similar to the cell 310 shown in fig. 4, the cell 310 shown in fig. 13 may include a first pole piece 3111, a second pole piece 3112, a separator 3113, and an electrolyte 316. One of the first and second pole pieces 3111 and 3112 may be a positive pole piece, and the other may be a negative pole piece. The cell 310 may also include the circuit board 500 shown in fig. 12A-12B.
Referring to fig. 12A-12B and fig. 13, the first electrical connector 511 of the circuit board 500 may be electrically connected to the first protection plate pin 322 of the battery protection plate 320. The second electrical connector 512 of the circuit board 500 may be disposed on the first pole piece 3111 of the battery cell 310 and electrically connected to the first pole piece 3111. The third electrical connector 521 of the circuit board 500 may be electrically connected with the second protection board pin 323 of the battery protection board 320. The fourth electrical connector 522 of the circuit board 500 may be located on a side of the circuit board 500 proximate the diaphragm 3113. In one example, an insulating gel 3115 may be applied over the fourth electrical connector 522.
In the case that the first protection plate pin 322 is a positive electrode pin, the first electrical connector 511 may belong to the positive electrode pin, the first pole piece 3111 may belong to the positive electrode piece, and the second pole piece 3112 may belong to the negative electrode piece. In the case that the first protection plate pin 322 is a negative electrode pin, the first electrical connector 511 may belong to the negative electrode pin, the first pole piece 3111 may belong to the negative electrode piece, and the second pole piece 3112 may belong to the positive electrode piece.
In the example shown in fig. 13, the cell 310 may include one reference electrode. In other examples, cell 310 may include two reference electrodes. For example, the cell 310 may include two circuit boards 500. One of the circuit boards 500 may serve as a positive electrode of the cell 310 and a first reference electrode, and the other circuit board 500 may serve as a negative electrode of the cell 310 and a second reference electrode.
Unlike the tab assemblies previously described, fig. 12A-12B, 13 take the form of a circuit board, implementing the various electrodes of the battery. On one hand, the circuit components on the flexible circuit board can be relatively flexible, the processing efficiency of the flexible circuit board can be relatively high, and the cost of devices such as batteries and the like can be reduced. On the other hand, the solutions shown in fig. 12A-12B and fig. 13 allow the flexible circuit board to be applied in the battery field, breaking the idea of using the tabs as the electrodes of the battery.
In conjunction with the above example, the electronic device 100 may control the charge and discharge state of the battery cell 310 through a battery protection unit (PMU), for example. In one example, the battery protection unit, the power management element, may be disposed on the battery protection plate 320. In another example, at least one of the battery protection unit, the power management element may be disposed outside the battery protection plate, for example, on a middle frame, a circuit board assembly, or the like. The battery protection unit and the power management element may be two separate devices or modules in the electronic apparatus 100, or may be physically integrated on the same device or module.
The battery protection unit may receive a positive polarity signal and a negative polarity signal from the battery cell 310. The positive signal and the negative signal received by the battery protection unit can supply power to electronic elements of the electronic equipment. The battery cell 310 may also receive a positive polarity signal and a negative polarity signal from the battery protection unit. The positive and negative signals received by the cell 310 may charge the cell 310.
The battery protection unit may send a discharge signal to the power management element, for example, so that the current output by the battery cell 310 may be input to other electronic elements of the electronic device through the power management element. The battery protection unit may receive a charging signal from the power management element, so that the current output by the external power source may be input to the battery cell 310 through the power management element.
The positive and negative signals interacted between the battery cell 310 and the battery protection unit may further reflect the charging current, the discharging current, the voltage difference between the positive and negative electrodes, and the like of the battery cell 310. The power management element may monitor the charging current, the discharging current, the voltage difference between the positive electrode and the negative electrode, and the like of the battery cell 310 in real time through a battery monitoring circuit on the battery protection unit. Based on the battery status information monitored in real time, the power management component may also approximate other battery status information, such as the current charging speed, the remaining charging time, the percentage of the current capacity of the battery cell 310 relative to the battery capacity, the battery temperature, the current dc impedance, and so on.
The power management element may also adjust the charging state or the discharging state of the battery cell 310 through one or more of a charging circuit, a discharging circuit, a battery monitoring circuit, and a battery protection circuit of the battery protection unit.
For example, in the charging process, in a case that the electric quantity of the battery cell 310 gradually increases, the power management element may output a battery protection signal to the battery protection board, so that the power management element may adjust the current conducted on the charging circuit through the battery protection circuit of the battery protection unit, so that the charging state of the battery cell 310 may be changed from the constant-current charging mode to the constant-voltage charging mode.
For another example, when the battery monitoring circuit monitors that the current flowing through the discharge circuit is too large, and the voltage difference between the positive electrode and the negative electrode of the battery cell 310 (hereinafter referred to as positive-negative voltage difference) is large, the power management element may output a battery protection signal to the battery protection board, so that the power management element may reduce the current flowing through the discharge circuit through the battery protection circuit of the battery protection unit, thereby being beneficial to ensuring that the battery cell 310 can work normally and safely and stably.
Fig. 14 is a schematic flowchart of a charging method 1400 provided in an embodiment of the present application. The charging method 1400 may be applied to an electronic device having the tab assembly 400 shown in fig. 3A-3C, 5A-5C, 7A-7C, 9, 10A-10C, 11A-11F, or having the circuit board 500 shown in fig. 12A-12B.
1401, monitoring that the current charging current of the battery is a first current, and the current negative pole potential of the battery is greater than a preset potential.
1402, controlling the charging current of the battery to be a second current, wherein the second current is smaller than the first current.
The principle of the charging method shown in fig. 14 will be explained below with reference to fig. 15 to 16.
The positive electrode potential or the negative electrode potential can reflect battery state information that a voltage difference between the positive electrode and the negative electrode cannot reflect, and therefore monitoring accuracy of the electronic device 100 on the battery state is improved. Fig. 15 shows a change in the positive-negative voltage difference (refer to the horizontal axis and the vertical axis on the left side in fig. 15), a change in the positive-negative potential (refer to the horizontal axis and the vertical axis on the left side in fig. 15), and a change in the negative-negative potential (refer to the horizontal axis and the vertical axis on the right side in fig. 15) during charging. As shown in fig. 15, neither the positive electrode potential nor the negative electrode potential is constant during charging. In the middle and later stages of the charging process, although the voltage difference between the positive electrode and the negative electrode tends to be stable, the potential of the negative electrode and the potential of the positive electrode tend to increase. The high anode potential and the high cathode potential are not favorable for safe charging. Therefore, the negative electrode potential or the positive electrode potential is monitored on the basis of monitoring the voltage difference between the positive electrode and the negative electrode, which is beneficial to improving the monitoring accuracy of the electronic device 100 on the battery state.
The solid line in fig. 16 shows the relationship between the charging current and the amount of electricity of the battery just shipped. The dashed line in fig. 16 shows the charging current versus the amount of charge of the aged battery.
The charging current of the battery may be related to the charge level of the battery. When the current charge of the battery is relatively small (e.g., when the battery is just charging), the charging speed of the battery is relatively fast, and the charging current of the battery can be relatively large. When the current charge of the battery is relatively large (for example, when the battery is just about to be charged), the charging speed of the battery is relatively slow, and the charging current of the battery can be relatively small.
In order to allow the battery to be charged as quickly as possible, the charging current of the battery may be relatively large. However, the charging speed of the battery may not be increased at will. To ensure the safety of the battery, the charging speed of the battery cannot be arbitrary for different battery capacities. As can be seen from fig. 15, the voltage difference between the positive electrode and the negative electrode of the battery may indirectly reflect the charging speed, the charging amount, and the like of the battery. In one way, the current charge of the battery can be indirectly determined by controlling the voltage difference between the positive electrode and the negative electrode of the battery, and then the charging speed of the battery can be controlled according to the solid line shown in fig. 16. For example, the capacity of the battery can be roughly estimated by looking up a table of Open Circuit Voltage (OCV). However, as the battery ages, the way the OCV is looked up becomes less and less accurate. The relationship between the charging speed of the battery and the charging current of the battery may change over time.
The capacity of the battery may be relatively large immediately after the battery is shipped. As the number of cycles of charging and discharging the battery increases, the battery may be deteriorated. The capacity of the aged battery may be slightly decreased compared to the battery that was just shipped. For example, assume that the capacity of the battery is a. When the battery just shipped is fully charged, the electric quantity of the battery just shipped may be a × a%. The aged battery may have a capacity of a × b% with b < a when the aged battery is fully charged. When the electric quantity of the battery which just leaves the factory is charged to A multiplied by b%, the charging current of the battery which just leaves the factory can be relatively high; and when the capacity of the aged battery is charged to a × b%, the charging current of the aged battery should be reduced to a relatively low value, for example, to match the current when the battery is fully charged. That is, the current that an aged cell can withstand is slightly reduced. Controlling the charging current of the battery according to the solid line in fig. 16 may subject the aged battery to a relatively large current, which tends to accelerate the aging speed of the battery.
There may be a relationship between the potential of the negative pole piece and the charge (or amount of lithium intercalation) of the battery. That is, the potential of the negative electrode tab can relatively directly reflect the lithium intercalation capability of the battery. Referring to fig. 16, there may be a relatively direct relationship between the charge of the battery and the charging speed of the battery (or the charging current of the battery) (the closer the amount of lithium intercalation is to the lithium intercalation capability, the smaller the charging current may be). Therefore, the charging current of the battery is controlled by monitoring the potential of the negative pole piece, the possibility of being charged too fast is favorably reduced, and the aging of the battery is favorably delayed.
In addition, the positive electrode material of the battery is consumed, which is a major factor affecting the aging of the battery. On the one hand, the positive electrode material and the negative electrode material are consumed, which increases the impedance of the positive electrode sheet and the negative electrode sheet. On the other hand, the effective substances of the anode material and the cathode material are reduced, which can directly cause the reduction of the available electric quantity of the battery. When the current is too large, lithium ions in the electrolyte may be precipitated on the negative electrode sheet of the battery, for example, solid lithium may be precipitated on the negative electrode sheet of the battery. When the metal lithium precipitated on the negative pole piece is in poor electrical contact with the negative pole, the difficulty of the negative pole piece participating in the oxidation-reduction reaction can be increased, and the total impedance of the battery is increased; when more metal lithium is separated out, a dendritic crystal form is formed, and an insulating pole piece in the battery can be punctured, so that the possibility of short circuit between the positive pole piece and the negative pole piece is increased.
As can be seen from fig. 15, if the voltage difference between the positive electrode and the negative electrode is only determined, the potential of the negative electrode plate cannot be accurately determined. In conjunction with the foregoing description, if only the voltage difference between the positive electrode and the negative electrode is monitored, the battery may be charged too fast, and therefore the positive electrode material of the battery may be separated out from the negative electrode tab of the battery relatively more likely. If the charging current of the battery is decreased in a lump, the charging speed of the battery may be decreased and the charging speed of the battery may be increased.
One way to effectively reduce the precipitation of the positive electrode material on the negative electrode plate is to monitor that the potential of the negative electrode plate is less than a predetermined potential (the predetermined potential may be, for example, one of 0.3V, 0.2V, 0.1V, 0V, -0.01V, -0.1V, etc.). And the potential of the negative pole piece is monitored, so that the positive pole material separated out on the negative pole piece is reduced.
By providing a reference electrode, it is advantageous to determine the positive or negative electrode potential of the battery. The state of the battery, such as the state of the aged battery, can be more accurately reflected by combining the voltage difference between the positive electrode and the negative electrode of the battery. For example, the electronic device may be beneficial to detect the state of health (SoH) of the battery, predict the life of the battery, determine an appropriate charging voltage, charging current, charging speed, charging time, state of capacity (SOC) (or amount of embedded lithium), and determine the dc impedance (DCR) of the battery.
Fig. 17 shows a schematic flowchart of another charging method 1800 provided in the embodiment of the present application. The charging method 1800 may be applied to an electronic device having the tab assembly 400 shown in fig. a-3C, fig. 5A-5C, fig. 7A-7C, fig. 9, fig. 10A-10C, fig. 11A-11F, or having the circuit board 500 shown in fig. 12A-12B.
1801, determining a positive impedance of the battery according to a positive potential or a negative potential of the battery and according to a charging current of the battery.
And 1802, in the case that the positive impedance of the battery is larger than a first preset impedance, adjusting the charging state of the battery or executing a first operation, wherein the first operation is used for indicating the current service life of the battery.
The first preset impedance may indicate a maximum limit value of the positive impedance when the battery is in a normal operation state. If the positive impedance of the battery exceeds the first preset impedance, it means that the battery may be currently in an abnormal operation state. The first predetermined impedance may be obtained by, for example, experiments, simulations, and the like. The first preset impedance may be set in a battery protection board or an electronic device before factory shipment, for example.
In one possible scenario, the battery may be currently in an overcharged state. By adjusting the state of charge of the battery, it is possible to restore the positive impedance of the battery to be less than the first predetermined impedance.
The adjusting the state of charge of the battery may include: reducing the charging current of the battery, reducing the charging voltage of the battery, reducing the temperature of the battery, and the like.
Take the example of reducing the charging current of the battery. In one example, the electronic device may decrease the charging current of the battery by a step current value. The electronic device may then determine whether the positive impedance of the battery is less than a first predetermined impedance. If so, the electronic device may stop reducing the charging current of the battery. If not, the electronic device may decrease the charging current of the battery by one more step current value until the positive impedance is smaller than the first preset impedance.
In the above example, the electronic device may decrease the charging current of the battery in a step-by-step manner to achieve the purpose of decreasing the positive impedance. In another example, the electronic device may decrease the charging voltage or temperature of the battery in a similar step-wise manner to achieve the goal of decreasing the positive impedance. In yet another example, the electronic device may decrease at least two of the charging current, the charging voltage, and the temperature of the battery, for example, in a step-wise manner, for the purpose of decreasing the positive impedance.
In another possible scenario, the battery may be currently in a state of severe aging. In this case, the positive impedance of the battery may not be recovered by adjusting the state of charge of the battery. The electronic device may prompt for battery life exhaustion by performing a first operation. The first operation may have a function of prompting the user to replace the battery. For example, the first operation indicating a current service life of the battery may include, for example, the first operation indicating a battery breakdown or aging.
In yet another possible case, as the battery gradually ages, the difficulty of adjusting the state of charge of the battery may gradually increase when the positive impedance of the battery exceeds the first preset impedance. For example, when the positive impedance of a relatively new battery exceeds a first predetermined impedance, the positive impedance of the battery can be restored to a reasonable range by reducing the charging current to a relatively small value. When the positive impedance of the relatively old battery exceeds the first preset impedance, the positive impedance of the battery can be restored to a reasonable range by reducing the relatively large charging current and even combining other means. The electronic device may infer the current age of the battery, i.e., the current service life of the battery, based on the particular means required to restore the positive impedance. For example, the electronic device may determine the lifetime of the battery based on one or more of a charging current, a charging voltage, and a temperature of the battery when the positive impedance of the battery returns to a first predetermined impedance. The electronic device may indicate the current service life of the battery to a user through a first operation.
Optionally, the first operation may be a voice prompt or a prompt message displayed on the user interface.
Fig. 18 shows a schematic flowchart of still another charging method 1900 provided in an embodiment of the present application. The charging method 1900 may be applied to an electronic device having the tab assembly 400 shown in fig. a-3C, fig. 5A-5C, fig. 7A-7C, fig. 9, fig. 10A-10C, fig. 11A-11F, or having the circuit board 500 shown in fig. 12A-12B.
1901, determining the negative impedance of the battery according to the positive or negative potential of the battery and according to the charging current of the battery.
1902, when the impedance of the negative electrode of the battery is greater than a second preset impedance, adjusting the state of charge of the battery or performing a second operation, the second operation being used to indicate the current service life of the battery.
The second predetermined impedance may indicate a maximum limit of the negative impedance when the battery is in a normal operating state. If the negative impedance of the battery exceeds the second preset impedance, it means that the battery may be in an abnormal working state currently. The second predetermined impedance may be obtained by, for example, experiments, simulations, and the like. The second preset impedance may be set in a battery protection board or an electronic device before factory shipment, for example.
In one possible scenario, the battery may be currently in an overcharged state. By adjusting the state of charge of the battery, it is possible to restore the negative impedance of the battery to be less than the second predetermined impedance. The adjusting the state of charge of the battery includes: reducing a charging current of the battery, reducing a charging voltage of the battery, and reducing a temperature of the battery. Similar to the adjustment of the charging state of the battery as described in 18, the electronic device may decrease one or more of the charging current, the charging voltage, and the temperature of the battery in a step-by-step manner, for example, to achieve the purpose of decreasing the impedance of the negative electrode.
In another possible scenario, the battery may be currently in a severely aged state. In this case, the negative impedance of the battery may not be recovered by adjusting the state of charge of the battery. The electronic device may prompt for battery life exhaustion by performing a second operation. For example, the second operation indicating the current service life of the battery may include, for example, the second operation indicating that the battery is damaged or aged. The second operation may have a function of prompting the user to replace the battery.
In yet another possible case, as the battery gradually ages, the difficulty of adjusting the state of charge of the battery may gradually increase when the impedance of the negative electrode of the battery exceeds the second preset impedance. The electronic device may infer the current age of the battery, i.e., the current service life of the battery, based on the particular means required to restore the impedance of the negative electrode. For example, the electronic device may determine the lifetime of the battery based on one or more of a charging current, a charging voltage, and a temperature of the battery when the impedance of the negative pole of the battery returns to the second preset impedance. The electronic device may indicate the current service life of the battery to the user through a second operation.
Optionally, with reference to the examples shown in fig. 17 and fig. 18, the electronic device may determine the first life of the battery according to one or more of the charging current, the charging voltage, and the temperature of the battery when the positive electrode impedance is restored to the first preset impedance; the electronic device may determine a second life of the battery according to one or more of a charging current, a charging voltage, and a temperature of the battery when the negative impedance is restored to a second preset impedance; the electronic device may determine a current life of the battery based on the first life and the second life. For example, the electronic device may determine an average of the first life and the second life as the current life of the battery. As another example, the electronic device may determine the maximum of the first life and the second life as the current life of the battery. As another example, the electronic device may sum the life factor of the positive electrode x the first life, and the life factor of the negative electrode x the second life to determine the current life of the battery.
Optionally, the second operation may be a voice prompt or a prompt message displayed on the user interface.
The principle of determining the positive or negative impedance of a battery is explained below in conjunction with fig. 19. It should be understood that fig. 19 is only an example, and the data relationship shown in fig. 19 does not constitute a limitation on the state of charge of the battery provided in the embodiment of the present application.
Assuming that the positive electrode potential of the battery is P when the battery is in a static state 0,+ The negative electrode potential of the battery is P 0,－ Reference electrode potential of the cell is P 0,# The voltage difference between the positive electrode and the negative electrode of the battery is U 0 ＝P 0,+ －P 0,－ 。
When the battery is charged, the positive electrode potential, the negative electrode potential and the voltage difference of the positive electrode and the negative electrode of the battery are changed, and the reference electrode potential of the battery can be basically unchanged. Assuming that the positive electrode potential of the battery is P when the battery is charged 1,+ The negative electrode potential of the battery is P 1,－ Reference electrode potential of the cell is P 0,# The voltage difference between the positive electrode and the negative electrode of the battery is U 1 ＝P 1,+ －P 1,－ 。
Derived from the above formula, U 1 ＝U 0 +I(R + +R － ) Wherein I may be the charging current of the battery, R + May be the positive impedance, R, of the battery － Can be used forIs the negative impedance of the cell. That is, when the positive electrode potential or the negative electrode potential of the battery is not determined, only the total impedance of the battery can be derived. If the total impedance of the battery changes, it cannot be determined whether the positive impedance of the battery changes or the negative impedance of the battery changes.
By deriving the above-mentioned formula, P can be obtained 1,+ ＝(P 0,+ －P 0,# )+IR + ；P 1,－ ＝(P 0,－ －P 0,# )+IR － . It can be seen that if the battery can detect the positive electrode potential or the negative electrode potential of the battery, the battery can monitor the positive electrode impedance of the battery and the negative electrode impedance of the battery.
If the positive resistance of the battery is increased, it may mean that the positive pole piece of the battery is worn too much, which is not favorable for the life of the battery. The possible reasons for the increase in the positive electrode impedance include, for example, that the positive electrode sheet is relatively strongly oxidized or that the oxidation rate is relatively fast. To alleviate battery aging, one possible way is to reduce the reaction rate of the positive electrode sheet, such as the voltage difference between the positive and negative electrodes, reducing the battery temperature, etc.
If the impedance of the negative electrode of the battery is increased, it may mean that the precipitation amount of the positive electrode material on the negative electrode tab is relatively large, which is not favorable for the life of the battery. To alleviate battery aging, one possible way is to reduce the charging speed of the battery, such as reducing the charging current of the battery, etc.
As can be seen from the examples shown in fig. 14 to 19, the charging mode of the battery can be optimized advantageously by the potential of the reference electrode of the battery, and the life of the battery can be delayed advantageously.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (25)

1. A tab assembly (400) for use with a battery, the battery including a pole piece, electrolyte and a battery protection plate, the tab assembly (400) comprising:
the battery protection plate comprises a first tab (410), wherein the first tab (410) is a positive tab or a negative tab, a first end (412) of the first tab (410) is used for being electrically connected with the battery protection plate, and a second end (413) of the first tab (410) is used for being electrically connected with the pole piece;
a second tab (420), the second tab (420) being a reference electrode tab, a first end (421) of the second tab (420) being for electrical connection with the battery protection plate, a second end (422) of the second tab (420) being for contact with the electrolyte;
the insulating component (430), the insulating component (430) and the first pole lug (410) or the second pole lug (420) are arranged in a stacked mode, and the insulating component (430) is located between the first pole lug (410) and the second pole lug (420).
2. The tab assembly (400) of claim 1 wherein the first end surface (414) of the first tab (410), the first end surface (423) of the second tab (420) are for electrical connection with the battery protection plate, the insulating member (430) includes a first portion (433) and a second portion (434), and the insulating member (430) is stacked with the second tab (420) to be configured as: a first portion (433) of the insulating member (430) is disposed in a stack with the second pole ear (420),
the first end face (435) of the first portion (433) of the insulating part (430) is attached to the second end face (424) of the second pole ear (420), the second portion (434) of the insulating part (430) is attached to and attached between the two adjacent side faces of the first pole ear (410) and the second pole ear (420), and the first end face (423) of the second pole ear (420) is opposite to the second end face (424) of the second pole ear (420).
3. The tab assembly (400) of claim 2 wherein the first tab (410) includes a first portion (4101) and a second portion (4102), the first portion (433) of the insulating member (430) further being disposed in a stacked relation with the first portion (4101) of the first tab (410),
the first part (4101) of the first tab (410) is attached to the second end surface (436) of the insulating member (430), the first end surface (435) of the insulating member (430) is arranged opposite to the second end surface (436) of the insulating member (430),
the second portion (4102) of the first tab (410) is attached to the second portion (434) of the insulating member (430).
4. The tab assembly (400) of claim 1, wherein the insulating member (430) is disposed in a stacked relationship with the first tab (410) or the second tab (420) by: the first pole lug (410), the second pole lug (420) and the insulating part (430) are arranged in a stacked mode, the second pole lug (420) comprises an extending part (425), the extending part (425) is perpendicularly arranged relative to the extending direction of the first pole lug (410) and extends towards the direction far away from the first pole lug (410), and the extending part (425) is used for being electrically connected with the battery protection plate.
5. The tab assembly (400) of claim 4 wherein the first tab (410) includes a battery connection area (411), the battery connection area (411) for electrical connection with the pole piece.
6. The tab assembly (400) of claim 5 wherein the first tab (410) protrudes relative to the insulating member (430) and the insulating member (430) protrudes relative to the second tab (420) at an end remote from the battery connection region (411), the first end (412) of the first tab (410) and the first end (421) of the second tab (420) being adapted to be disposed on either side of the battery protection plate.
7. The tab assembly (400) of claim 5 or 6 wherein the battery connecting region (411) of the first tab (410) protrudes with respect to the insulating member (430), and an end of the insulating member (430) adjacent to the battery connecting region (411) protrudes with respect to the second tab (420).
8. The tab assembly (400) of claim 7 wherein the insulating member (430) extends in a direction perpendicular to the second tab (420) and wraps around the second end (422) of the second tab (420).
9. The tab assembly (400) as claimed in any one of claims 4 to 8, wherein the second tab (420) comprises a first through hole (426), the insulating member (430) comprises a second through hole (432), the first through hole (426) and the second through hole (432) are communicated with each other, and the first through hole (426) and the second through hole (432) are disposed opposite to the battery connection region (411).
10. A circuit board (500) for application to a battery including a battery protection plate, a pole piece and an electrolyte, the circuit board (500) comprising:
the circuit comprises a first conducting layer (510), wherein a first circuit is arranged on the first conducting layer (510), and the first circuit is a positive circuit or a negative circuit;
a second conductive layer (520), wherein a second circuit is arranged on the second conductive layer (520), and the second circuit is a reference electrode circuit;
a first insulating layer (531), the first insulating layer (531) being located on a side of the first conductive layer (510) remote from the second conductive layer (520);
a second insulating layer (532), the second insulating layer (532) being located between the first conductive layer (510) and the second conductive layer (520);
a third insulating layer (533), the third insulating layer (533) being located on a side of the second conductive layer (520) remote from the first conductive layer (510);
a first electric connector (511) and a second electric connector (512) are arranged on the first insulating layer (531), the first electric connector (511) and the second electric connector (512) are electrically connected with the first circuit, the first electric connector (511) is used for being electrically connected with the battery protection board, and the second electric connector (512) is used for being electrically connected with the pole piece;
a third electric connecting piece (521) and a fourth electric connecting piece (522) are arranged on the third insulating layer (533), the third electric connecting piece (521) and the fourth electric connecting piece (522) are electrically connected with the second circuit, the third electric connecting piece (521) is used for being electrically connected with the battery protection board, and the fourth electric connecting piece (522) is used for being in contact with the electrolyte;
wherein the first electrical connector (511) and the third electrical connector (521) penetrate through the first insulating layer (531), or the first electrical connector (511) and the third electrical connector (521) penetrate through the third insulating layer (533),
one of the second electrical connection (512) and the fourth electrical connection (522) passes through the first insulating layer (531), and the other passes through the third insulating layer (533).
11. The circuit board (500) according to claim 10, wherein the circuit board (500) comprises a first portion (501) and a second portion (502), the first portion (501) and the second portion (502) are arranged perpendicular to each other, one of the first electrical connector (511) and the third electrical connector (521) is arranged on the first portion (501), and the other is arranged on the second portion (502).
12. The circuit board (500) of claim 11, wherein the second electrical connector (512) and the fourth electrical connector (522) are arranged at the first portion (501).
13. The circuit board (500) according to any of claims 10 to 12, wherein a circuit board glue (540) is arranged around the outer circumference of the circuit board (500).
14. A battery protection plate (320) comprising the tab assembly (400) according to any one of claims 1 to 9, and a first protection plate pin (322), a second protection plate pin (323),
the first end (412) of the first tab (410) is electrically connected with the first protection plate pin (322), and the first end (421) of the second tab (420) is electrically connected with the second protection plate pin (323).
15. A battery protection plate (320) comprising a circuit board (500) according to any one of claims 10 to 13, and a first protection plate pin (322), a second protection plate pin (323),
the first electric connector (511) is electrically connected with the first protection plate pin (322), and the third electric connector (521) is electrically connected with the second protection plate pin (323).
16. A battery cell (310) comprising a pole piece, an electrolyte (316), a separator (3113) and a cell casing (312), the pole piece, the electrolyte (316) and the separator (3113) being housed in the cell casing (312), characterized in that the battery cell (310) further comprises a tab assembly (400) according to any of claims 1 to 9.
17. The electrical core (310) of claim 16, wherein the electrical core (310) further comprises an insulating rubber sheet (3115), and the insulating rubber sheet (3115) is attached to the tab assembly (400) and is located between the membrane (3113) and the tab assembly (400).
18. The electrical core (310) of claim 17, wherein the insulating rubber sheet (3115) is a porous material.
19. A battery cell (310) comprising a pole piece, an electrolyte (316), a separator (3113) and a cell casing (312), the pole piece, the electrolyte (316) and the separator (3113) being housed in the cell casing (312), characterized in that the battery cell (310) further comprises a circuit board (500) according to any of claims 10 to 13.
20. The cell (310) of claim 19, wherein the cell (310) further comprises an insulating rubber sheet (3115), and the insulating rubber sheet (3115) is attached to the circuit board (500) and is located between the membrane (3113) and the circuit board (500).
21. The electrical core (310) of claim 20, wherein the insulating rubber sheet (3115) is a porous material.
22. The electric core (310) of any of claims 19 to 21, wherein a circuit board gel (540) is disposed around the outer periphery of the circuit board (500), and the circuit board gel (540) is sealingly connected to the cell casing (312).
23. A battery (30) comprising the battery cell (310) of any of claims 16-22 and a battery protection sheet (320).
24. An electronic device, characterized in comprising a tab assembly (400) according to any one of claims 1 to 9, or a circuit board (500) according to any one of claims 10 to 13.
25. A mobile device, characterized by comprising a tab assembly (400) according to any one of claims 1 to 9, or a circuit board (500) according to any one of claims 10 to 13.
CN202110808787.4A 2021-07-16 2021-07-16 Utmost point ear subassembly, circuit board, electric core, battery, electronic equipment and mobile device Pending CN115621673A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202110808787.4A CN115621673A (en) 2021-07-16 2021-07-16 Utmost point ear subassembly, circuit board, electric core, battery, electronic equipment and mobile device
PCT/CN2022/103605 WO2023284575A1 (en) 2021-07-16 2022-07-04 Tab assembly, circuit board, battery cell, battery, electronic device and mobile apparatus

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CN102496750B (en) * 2011-12-20 2014-10-08 华为技术有限公司 Battery
WO2015127442A1 (en) * 2014-02-24 2015-08-27 Oned Material Llc Anode, cell, and method of stabilizing an anode for use in a lithium ion electrochemical cell
CN204011598U (en) * 2014-06-30 2014-12-10 比亚迪股份有限公司 Signal acquisition module and the battery system with it
CN207896215U (en) * 2018-03-01 2018-09-21 北京小米移动软件有限公司 Battery and electronic equipment including the battery
CN113131026B (en) * 2019-12-30 2022-09-30 荣盛盟固利新能源科技有限公司 Evaluation device and evaluation method for battery health state of hard-shell battery

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