CN112510296B - Battery assembly, heating method thereof and electronic equipment - Google Patents
Battery assembly, heating method thereof and electronic equipment Download PDFInfo
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- CN112510296B CN112510296B CN202011385766.8A CN202011385766A CN112510296B CN 112510296 B CN112510296 B CN 112510296B CN 202011385766 A CN202011385766 A CN 202011385766A CN 112510296 B CN112510296 B CN 112510296B
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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
- H01M10/42—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
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
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- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Automation & Control Theory (AREA)
- Battery Mounting, Suspending (AREA)
- Secondary Cells (AREA)
Abstract
The battery assembly comprises a battery cell assembly and a packaging piece, wherein the battery cell assembly comprises a battery cell main body, and a first tab and a second tab which are electrically connected with the battery cell main body. The packaging piece is coated on the outer peripheral surface of the battery cell assembly and comprises a first heating layer, and a first conductive terminal and a second conductive terminal which are electrically connected with the first heating layer. The first heating layer is used for heating the battery cell main body. One end of the first conductive terminal, which is far away from the first heating layer, is used for connecting the first tab. One end of the second conductive terminal, which is far away from the first heating layer, is used for connecting the second lug. The application provides a battery pack capable of improving the charging rate of the battery pack and reducing the overall volume of electronic equipment, a heating method thereof and the electronic equipment.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a battery assembly, a heating method thereof and electronic equipment.
Background
The charging rate of a battery is affected by the temperature of the battery, for example, the charging efficiency of the battery at low temperature is low, and as people seek to lighten and thin electronic devices, how to reduce the whole volume of the electronic devices is also an important research of technicians. Therefore, how to increase the charging rate of the battery and reduce the overall volume of the electronic device is a technical problem to be solved.
Disclosure of Invention
The application provides a battery pack, a heating method thereof and an electronic device, wherein the battery pack can improve the charging rate of the battery pack and reduce the overall volume of the electronic device.
In a first aspect, an embodiment of the present application provides a battery assembly, including: the battery cell assembly comprises a battery cell main body and a first tab and a second tab which are electrically connected with the battery cell main body; and the packaging piece is coated on the outer peripheral surface of the battery cell assembly, the packaging piece comprises a first heating layer, a first conductive terminal and a second conductive terminal, the first conductive terminal and the second conductive terminal are electrically connected with the first heating layer, the first heating layer is used for heating the battery cell main body, one end, far away from the first heating layer, of the first conductive terminal is used for connecting the first tab, and one end, far away from the first heating layer, of the second conductive terminal is used for connecting the second tab.
In a second aspect, an electronic device provided in an embodiment of the present application includes the battery assembly.
In a third aspect, an embodiment of the present application provides a method for heating a battery assembly, where the battery assembly includes a battery cell assembly, a package, a temperature sensor, and a controller, the package wraps an outer peripheral surface of the battery cell assembly, and the package includes a first heating layer; the temperature sensor is used for detecting the temperature of the battery cell main body; the method comprises the following steps:
Acquiring the detection temperature of the temperature sensor;
determining a target heating mode in a first heating mode, a second heating mode and a third heating mode according to the detected temperature, and controlling the first heating layer to heat in the target heating mode; the first heating mode is heating from a low temperature interval to a fast charging temperature interval; the second heating mode is heating from a low temperature interval to a high rate temperature; the third heating mode is to heat from a fast charging temperature interval to a high-rate temperature interval, wherein the minimum temperature value of the fast charging temperature interval is larger than the maximum temperature value of the low-temperature interval; and the minimum temperature value of the high-rate temperature interval is larger than the maximum temperature value of the quick charge temperature interval.
According to the battery assembly provided by the embodiment, the first heating layer is arranged in the packaging piece and is used for heating the battery core assembly, so that the charging multiplying power of the battery assembly is improved, the internal structure of the packaging piece is not influenced, and the volume and the internal electrochemical reaction of the battery core assembly are not influenced; in addition, the first conductive terminal of the first heating layer is used for being electrically connected with the first lug of the battery cell assembly, and the second conductive terminal of the first heating layer is used for being electrically connected with the second lug of the battery cell assembly, so that the heating loop can be reused with part of branches of the charging loop, the integration level of an electronic circuit is improved, and the whole volume of the battery assembly is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application;
FIG. 2 is an exploded schematic view of the electronic device provided in FIG. 1;
FIG. 3 is a schematic perspective view of a battery assembly provided in FIG. 1;
FIG. 4 is a schematic cross-sectional view of a battery assembly provided in FIG. 1;
fig. 5 is a schematic circuit diagram of the battery assembly provided in fig. 4;
FIG. 6 is a schematic circuit diagram of the battery assembly provided in FIG. 5 in a first heating mode;
fig. 7 is a schematic circuit diagram of the battery assembly provided in fig. 5 in a charging mode;
FIG. 8 is a schematic circuit diagram of the battery assembly provided in FIG. 5 in a second heating mode;
FIG. 9 is a schematic view of a partial cross-sectional structure of another package provided in FIG. 3;
FIG. 10 is a schematic circuit diagram of the package provided in FIG. 9;
FIG. 11 is a schematic diagram of the circuit structure of the package provided in FIG. 10 in a heated state;
FIG. 12 is a schematic cross-sectional view of another battery assembly provided in FIG. 3;
FIG. 13 is a schematic circuit diagram of the first and third heating layers of the battery assembly provided in FIG. 12;
FIG. 14 is a schematic diagram of a circuit structure of the first heating layer, the second heating layer, and the third heating layer of the battery assembly provided in FIG. 12;
fig. 15 is a schematic view of the circuit structure of the battery assembly provided in fig. 14 in a first heating state;
fig. 16 is a schematic view of the circuit structure of the battery assembly provided in fig. 14 in a second heating state;
fig. 17 is a schematic view of the circuit structure of the battery assembly provided in fig. 14 in a third heating state;
fig. 18 is a flowchart of a heating method of a battery pack according to an embodiment of the present application;
fig. 19 is a graph of a cell assembly having a capacity of 5mAh charged at 0.7C at normal temperature 25C and charged at 1.5C rate after heating to 50℃.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The embodiments of the application may be suitably combined with each other.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic device 100 according to an embodiment of the application. The electronic device 100 may be a chargeable device such as a phone, a television, a tablet, a cell phone, a camera, a personal computer, a notebook, a wearable device, an electric car, an airplane, etc. Referring to fig. 1, in the present application, an electronic device 100 is taken as an example of a mobile phone, and a person skilled in the art can easily think of structural design of other chargeable devices according to the technical means of the present embodiment, so as to achieve improvement of charging efficiency.
Referring to fig. 2, an electronic device 100 according to the present application includes a battery assembly 10. In this embodiment, the electronic device 100 is a mobile phone. The electronic device 100 further includes a display 20, a center 30, and a rear cover 40. The display 20, the middle frame 30 and the rear cover 40 are fixedly connected in sequence. The battery assembly 10 is provided to the center 30. The battery assembly 10 is used for supplying power to a display 20, a main board arranged on the middle frame 30, and the like.
The battery assembly 10 includes, but is not limited to, all solid state batteries such as lithium ion batteries, lithium metal batteries, lithium-polymer batteries, lead-acid batteries, nickel-metal hydride batteries, nickel-manganese-cobalt batteries, lithium-sulfur batteries, lithium-air batteries, nickel-hydrogen batteries, lithium ion batteries, iron batteries, nano-batteries, and the like. The embodiment of the present application is described taking the battery assembly 10 as a lithium ion battery as an example, and those skilled in the art can easily think of structural design of other types of batteries according to the technical means of the present embodiment.
The shape of the battery assembly 10 is not particularly limited in the present application. The battery assembly 10 may be in a cylindrical form, a pouch-like form, an arc-like form, a pouch Fang Zhuang, a cylindrical form, a prismatic form, a profile, or the like.
Referring to fig. 3, in the present embodiment, the battery assembly 10 includes a battery cell assembly 1 and a first electrode terminal 60 and a second electrode terminal 70 electrically connected to the battery cell assembly 1. The first electrode terminal 60 is a positive electrode, and the second electrode terminal 70 is a negative electrode; alternatively, the first electrode terminal 60 is a negative electrode and the second electrode terminal 70 is a positive electrode. The first electrode terminal 60 and the second electrode terminal 70 are used to input a charging current for charging the cell assembly 1 and output a discharging current of the cell assembly 1.
Optionally, the first electrode terminal 60 and the second electrode terminal 70 may be disposed in the flexible circuit board and electrically connected to the battery docking interface on the motherboard through the lead interface of the flexible circuit board, and further electrically connected to the USB charging interface 50 (see fig. 2) on the center 30 or discharge the devices in the electronic device 100.
Optionally, the first electrode terminal 60 and the second electrode terminal 70 are disposed on the surface of the housing of the battery module 1 at intervals, and exist in a bare form, and the first electrode terminal 60 and the second electrode terminal 70 are respectively electrically connected with the positive electrode terminal and the negative electrode terminal in the battery compartment, so as to be electrically connected to the USB charging interface 50 (refer to fig. 2) on the middle frame 30 or discharge devices in the electronic device 100.
Referring to fig. 3, the battery cell assembly 1 includes a battery cell main body 11, a first tab 12, a second tab 13, a protection circuit 14 (also referred to as a management circuit), and a package 15.
Optionally, referring to fig. 4, the cell main body 11 includes a first electrode 111, a second electrode 112, a diaphragm 113, and an electrolyte 114.
Wherein the first pole piece 111 is a positive pole piece, and the second pole piece 112 is a negative pole piece; alternatively, the first electrode sheet 111 is a negative electrode sheet, and the second electrode sheet 112 is a positive electrode sheet. In this embodiment, the first pole piece 111 is a positive pole piece, and the second pole piece 112 is a negative pole piece. Specifically, the first pole piece 111 includes a positive current collector and a positive electrode material disposed on the positive current collector. For example, the positive electrode current collector is an aluminum foil having a thickness of 10-20 μm. The positive electrode material comprises layered or spinel transition metal oxide or polyanion compound with high electrode potential and stable structure, such as lithium cobaltate, lithium manganate, lithium iron phosphate, ternary material, etc. The positive electrode material also includes carbon black and a binder. The binder may be polyvinylidene fluoride (PVDF). The diaphragm 113 is disposed between the first pole piece 111 and the second pole piece 112 at intervals, and is used for preventing the first pole piece 111 from directly contacting the second pole piece 112. The separator 113 is a specially formed polymer film, and the separator 113 has a microporous structure, so that lithium ions can pass freely, but electrons cannot pass. The material of the separator 113 includes, but is not limited to, polyethylene (PE), polypropylene (PP), or a composite film thereof. The composite membrane is, for example, a PP/PE/PP three-layer separator 113. The electrolyte 114 is disposed between the first electrode sheet 111 and the second electrode sheet 112, so that the first electrode sheet 111 consumes electrons and the second electrode sheet 112 generates electrons.
The application is not particularly limited to the type of the battery cell main body 11, and the battery cell main body 11 can form a laminated battery cell, namely, a first pole piece 111, a diaphragm 113, a second pole piece 112, a diaphragm 113, a first pole piece 111, a diaphragm 113 and a second pole piece 112 … … are sequentially arranged, or can form a wound battery cell, namely, the first pole piece 111, the diaphragm 113 and the second pole piece 112 are arranged in a laminated mode and then wound.
Referring to fig. 4, the first tab 12 is a positive tab, and the first tab 12 is electrically connected to the first pole piece 111. The connection mode includes but is not limited to integral molding, welding, conductive adhesive bonding and the like. The second tab 13 is a negative tab, and the second tab 13 is electrically connected to the second tab 112. The connection mode includes but is not limited to integral molding, welding, conductive adhesive bonding and the like. During the charging of the battery assembly 10, the first tab 12 is electrically connected to the first electrode terminal 60 of the battery assembly 10 or forms the first electrode terminal 60 of the battery assembly 10, and the second tab 13 is electrically connected to the second electrode terminal 70 of the battery assembly 10 or forms the second electrode terminal 70 of the battery assembly 10. In this embodiment, the first tab 12 is electrically connected to the first electrode terminal 60 of the battery assembly 10, and the second tab 13 is electrically connected to the second electrode terminal 70 of the battery assembly 10.
Referring to fig. 4, the package 15 is coated on the outer peripheral surface of the battery cell assembly 1. The package 15 is a structure for packaging the first electrode sheet 111, the second electrode sheet 112, the separator 113, and the electrolyte 114. It is understood that the package 15 includes, but is not limited to, a deformable structure or a non-deformable structure. The initial substrate of the package 15 is a sheet structure. The package 15 can be deformed to form a containing groove during stamping, the first pole piece 111, the second pole piece 112 and the diaphragm 113 can be arranged in the containing groove, then the package 15 is coated on the outer peripheral surface of the battery cell main body 11, the package 15 and the battery cell main body 11 are pressed, and the edge of the package 15 is sealed, so that the package 15 is tightly coated on the battery cell main body 11, and the package volume of the battery assembly 10 is reduced.
Referring to fig. 4 and 5, the package 15 includes a first heating layer 151, and a first conductive terminal 152 and a second conductive terminal 153 electrically connected to the first heating layer 151. The first heating layer 151 is used for heating the cell main body 11. When the first conductive terminal 152 and the second conductive terminal 153 are respectively connected to two poles of the heating power supply so that a heating circuit formed by the first conductive terminal 152, the first heating layer 151 and the second conductive terminal 153 is provided with current, the first heating layer 151 generates heat, and the first heating layer 151 is arranged in the package 15, so that the package 15 is coated on the outer peripheral surface of the battery cell assembly 1, and the first heating layer 151 is used for heating the battery cell assembly 1. According to the application, the first heating layer 151 is arranged on the packaging piece 15, and the first heating layer 151 is close to the battery cell assembly 1 and surrounds the battery cell assembly 1, so that the battery cell assembly 1 can be uniformly heated, and the heated heat can be quickly conducted to the battery cell assembly 1, so that the heat conduction efficiency is improved.
In this embodiment, the package 15 is a multi-layer structure formed by laminating a plurality of layers, wherein the multi-layer structure includes at least one first heating layer 151, and other layer structures are illustrated later. The material of the first heating layer 151 includes, but is not limited to, an electrically heating material. I.e. the first heating layer 151 is made of an electrically conductive material. Electrically heated materials include, but are not limited to, one or more of graphite, nickel, aluminum, copper, stainless steel, positive temperature coefficient heating resistors (Positive Temperature Coefficient, PTC), alloys, and the like; or the material of the electric heating material comprises a multi-layer composite material formed by externally compounding one or more layers of polymer films. The first heating layer 151 may be formed in the package 15 itself, or may be formed in the package 15. In other embodiments, the package 15 may be a single film layer, which is the first heating layer 151.
In this embodiment, an end of the first conductive terminal 152 away from the first heating layer 151 is used for connecting the first tab 12, and an end of the second conductive terminal 153 away from the first heating layer 151 is used for connecting the second tab 13. Specifically, one end of the first conductive terminal 152 is electrically connected to the first heating layer 151, and the other end extends in a direction away from the first heating layer 151. The other end of the first conductive terminal 152 is electrically connected to the first tab 12. Specific connection methods include, but are not limited to, fixedly connecting the first conductive terminal 152 and the first tab 12 by welding, hot press molding, and the like. In other embodiments, the first conductive terminal 152 of the first heating layer 151 may be electrically connected to the first tab 12 through a conductive wire, a conductive adhesive, or the like. In this way, the heating circuit of the first heating layer 151 and the charging circuit of the battery module 1 are at least partially reusable, so that the area occupied by the heating circuit can be reduced while the first heating layer 151 heats the battery module 1, and the overall volume of the battery module 10 is reduced.
Referring to fig. 4 and 5, one end of the first tab 12 is disposed in the package 15 and electrically connected to the first electrode 111, and the other end of the first tab 12 extends out of the package 15 and is electrically connected to the first electrode 60 of the battery assembly 10. The first conductive terminal 152 is electrically connected to an end of the first tab 12 protruding from the package 15. The first conductive terminal 152 is electrically connected to the first electrode terminal 60 (see fig. 3).
Referring to fig. 4, one end of the second tab 13 is disposed in the package 15 and electrically connected to the second electrode 112, and the other end of the second tab 13 extends out of the package 15 and is electrically connected to the second electrode terminal 70 of the battery assembly 10 (see fig. 3). The end of the second conductive terminal 153 away from the first heating layer 151 is used for connecting the second lug 13, specifically, the end of the second conductive terminal 153 away from the first heating layer 151 can be electrically connected with the second lug 13 through a switch. Because the first heating layer 151 is made of a conductive material, when the second electrode tab 13 does not need to be electrically connected to the first heating layer 151, an insulating glue 154 may be disposed between the second electrode tab 13 and the package 15 or between the second electrode tab and the first heating layer 151 for sealing.
Optionally, the first conductive terminal 152 is opposite to or not opposite to the first tab 12, and the second conductive terminal 153 is opposite to or not opposite to the second tab 13, which is not limited in the present application.
According to the battery assembly 10 provided by the embodiment, the first heating layer 151 is designed in the packaging piece 15, and the first heating layer 151 heats the battery assembly 1, so that the temperature inside the battery main body 11 can be quickly increased, and the electrochemical reaction speed inside the battery assembly 1 is further increased, and the charging rate of the battery assembly 10 is further increased, and the first heating layer 151 is an improvement on the internal structure of the packaging piece 15 and does not affect the internal structure of the battery assembly 1, so that the volume and the electrochemical reaction inside the battery assembly 1 are not affected; in addition, the first conductive terminal 152 of the first heating layer 151 is electrically connected to the first tab 12 of the battery module 1, and the end of the second conductive terminal 153 away from the first heating layer 151 can be electrically connected to the second tab 13 of the battery module 1, so that the heating circuit can be reused with a part of the branches of the charging circuit, the integration level of the electronic circuit is improved, and the overall volume of the battery module 10 is reduced.
It can be appreciated that the battery assembly 10 provided in this embodiment is a self-heating battery, since the heating layer is located within the battery assembly 10.
In an embodiment, referring to fig. 4, the package 15 is an aluminum plastic film, so that the battery assembly 10 has the characteristics of high oxygen resistance, moisture resistance, puncture resistance, and the like. The aluminum plastic film includes a protective layer 155, a first adhesive layer (not shown), an aluminum foil (see 151 in fig. 5), a second adhesive layer (not shown), and a base layer 156, which are laminated in this order. The base layer 156 is adjacent to the cell body 11. Wherein the material of the protective layer 155 includes, but is not limited to, nylon. The protective layer 155 serves to improve wear resistance of the battery assembly 10 and to prevent surface scratches. The aluminum foil is used for reflecting heat and shielding electromagnetic waves. The substrate layer 156 has better high temperature resistance and is used for thermal packaging of the aluminum plastic film and the tab.
The first heating layer 151 is aluminum foil. The first conductive terminal 152 and the second conductive terminal 153 are two conductive terminals provided on the first heating layer 151.
In the embodiment, by utilizing the capability of aluminum foil in an aluminum plastic film to generate heat when being electrified, the aluminum foil in the aluminum plastic film is designed to be a first heating layer 151 for heating the battery cell assembly 1, the structure of the aluminum foil is improved, two conductive terminals are designed, and a first conductive terminal 152 and a second conductive terminal 153 are respectively formed; the first heating layer 151 is not required to be additionally arranged, namely, the hierarchical structure of the aluminum plastic film is not required to be greatly modified, the cost and the working procedure are saved, and the thickness of the aluminum plastic film can be reduced. The aluminum foil in the aluminum plastic film is fully utilized in the embodiment, so that the aluminum plastic film has the effects of reflecting heat and shielding electromagnetic waves, and also has the effect of heating the battery cell assembly 1, the function of the battery assembly 10 is increased, the volume of the battery assembly 10 is not additionally increased, and the miniaturization of the battery assembly 10 is promoted.
Of course, in other embodiments, the first heating layer 151 may be a film layer additionally disposed in the plastic-aluminum film. Specifically, the first heating layer 151 may be disposed on at least one of a side of the protective layer 155 facing away from the substrate layer 156, or disposed between the protective layer 155 and the first adhesive layer, or disposed between the first adhesive layer and the aluminum foil, or disposed between the aluminum foil and the second adhesive layer, or disposed between the second adhesive layer and the substrate layer 156, or disposed on a side of the substrate layer 156 facing away from the second adhesive layer, and the like. Optionally, the first heating layer 151 may be further embedded in at least one of the protective layer 155, the first adhesive layer, the aluminum foil, the second adhesive layer, and the base layer 156. It is understood that the number of the first heating layers 151 may be one or more.
In an embodiment, referring to fig. 4 and 5, the battery assembly 10 further includes a first switch 161 and a second switch 162. The first switch 161 is electrically connected between the second electrode terminal 70 and the second electrode tab 13. The second switch 162 is electrically connected between the second electrode terminal 70 and the second conductive terminal 153. In other words, the second electrode tab 13 and the second conductive terminal 153 are joined and connected to the second electrode terminal 70 after passing through the first switch 161 and the second switch 162, respectively.
The application improves the electric connection relation between the second electrode lug 13 and the second electrode terminal 70, and a first switch 161 is arranged between the second electrode lug 13 and the second electrode terminal 70, wherein the first switch 161 is a switch for controlling the connection and disconnection of a charging loop; and a second switch 162 is disposed between the second electrode terminal 70 and the second conductive terminal 153, where the second switch 162 is a switch for controlling on and off of the heating circuit, so as to control the charging mode of the battery module 1 and the heating mode of the first heating layer 151.
Further, the battery assembly 10 also includes a controller (not shown). The controller is used for controlling the second switch 162 to be turned on and the first switch 161 to be turned off in the heating mode; and for controlling the first switch 161 to be turned on and the second switch 162 to be turned off in the charging mode. The controller is further configured to control the first switch 161 and the second switch 162 to be turned on in the heating charging mode. The heating mode is a mode in which the controller controls the first heating layer 151 to heat. The heating modes comprise a first heating mode and a second heating mode, wherein the first heating mode is used for supplying power to the first heating layer 151 through an external power supply, and the second heating mode is used for supplying power to the first heating layer 151 through the battery cell assembly 1. The charging mode is a mode in which the controller controls the charging of the battery cell assembly 1. The heating and charging mode is a mode in which the first heating layer 151 is heated while the battery cell assembly 1 is charged.
Specifically, the controller may be disposed on the protection board and electrically connected to the charging protection circuit 14.
In one possible embodiment, referring to fig. 6, the first heating layer 151 is electrically connected to an external power source through the charging interface, and the controller controls the second switch 162 to be turned on and the first switch 161 to be turned off in the first heating mode, at this time, the first heating layer 151 heats the battery cell assembly 1, and the battery cell assembly 1 is not charged. This application situation may be used in very low temperature situations, where the electrochemical reaction inside the battery module 1 has a low reaction rate at very low temperature, so that the battery module 10 cannot be charged at a normal rapid charging rate, and thus the electronic device 100 may be powered on, and the controller controls the first heating layer 151 to heat the battery module 1, so that the battery module 10 enters a self-heating mode.
Referring to fig. 7, when the temperature of the battery module 1 reaches the fast charging temperature range (e.g., 10-45 ℃), the second switch 162 is controlled to be turned on to start charging the battery module 1, and the battery module 1 can be charged at the fast charging rate because the temperature of the battery module 1 reaches the fast charging temperature range at this time, the second switch 162 is controlled to be turned off, and the first heating layer 151 stops heating the battery module 1 to make the battery module 10 enter the charging mode. Alternatively, the heating of the cell assembly 1 is continued to put the battery assembly 10 into the charge heating mode.
Specifically, since the temperature of the battery cell assembly 1 is already in the fast charging temperature interval, and a certain amount of heat is generated while the battery cell assembly 1 is charged at the fast charging rate, so that the battery cell assembly 1 is kept in the fast charging temperature interval and charged at the fast charging rate, and the battery cell assembly 1 can be quickly charged to saturation, the controller can control the first heating layer 151 to be heated to the fast charging temperature interval and then stop heating the battery cell assembly 1, so that electric energy is saved.
Specifically, since the charging rate of the battery cell assembly 1 is related to temperature, when the temperature of the battery cell assembly 1 has reached the fast charging temperature interval, the battery cell assembly 1 can be controlled to be charged, and the first heating layer 151 can further heat the battery cell assembly 1, so that the battery cell assembly 1 is charged with a high charging rate (for example, the high charging rate exceeds the rated charging rate), and the charging rate of the battery assembly 10 is further improved.
The controller controls the first switch 161 and the second switch 162 to be turned off and on so as to control the first heating layer 151 to heat the battery cell assembly 1 and control the battery cell assembly 1 to be charged, so that the battery cell assembly 1 can be charged at a proper temperature range with a rapid charging rate or a high rate, and the charging speed of the battery cell assembly 1 is improved.
Referring to fig. 8, the battery assembly 10 further includes an isolation circuit 170. The isolation circuit 170 is electrically connected between the second electrode terminal 70 and the second conductive terminal 153. The isolation circuit 170 is used to isolate the cell assembly 1 from the first heating layer 151 in the heating charging mode. Specifically, the isolation circuit 170 is configured to isolate the current of the battery module 1 from the current of the first heating layer 151 in the heating and charging mode, so that parallel branches independent of each other are formed between the battery module 1 and the first heating layer 151.
Specifically, the isolation circuit 170 includes at least one isolation resistor 171 and a third switch 163. Specifically, the isolation circuit 170 includes one isolation resistor 171, or includes a combination of a plurality of isolation resistors 171, or includes a combination of the isolation resistors 171 and other isolation devices, or the like. The number of the third switches 163 may be one or more, and is not limited herein.
The number of isolation resistors 171 and the number of third switches 163 are all one in this embodiment. One end of the isolation resistor 171 is electrically connected to the second electrode terminal 70. The other end of the isolation resistor 171 is electrically connected to one end of the third switch 163. The other end of the third switch 163 is electrically connected to the second conductive terminal 153.
The controller is used for controlling the second switch 162 to be turned on or the third switch 163 to be turned on in the heating mode.
Specifically, when the first electrode terminal 60 and the second electrode terminal 70 of the battery assembly 10 are turned on to the external power source, the controller may control the second switch 162 to be turned on and the third switch 163 to be turned off in the first heating mode, and at this time, the first heating layer 151 is turned on to the external power source.
Referring to fig. 8, when the first electrode terminal 60 and the second electrode terminal 70 of the battery assembly 10 are not connected to the external power source, the controller may control the third switch 163 to be turned on and the second switch 162 to be turned off while the first switch 161 is turned on in the second heating mode; at this time, the first tab 12 is electrically connected to the first conductive terminal 152, the second tab 13 is electrically connected to the second conductive terminal 153, and at this time, the first heating layer 151 supplies power to the first heating layer 151, and the first heating layer 151 heats the first heating layer 1. The embodiment can be applied to the low-temperature scene, and the battery cell assembly 1 is preheated when the external power supply is connected with the battery cell assembly 1, so that the battery cell assembly 1 is in a fast charging temperature interval when the external power supply is connected with the battery cell assembly 1, and the battery cell assembly 1 can be charged rapidly. This embodiment may also be used for unstable discharge rate of the battery cell assembly 1 at low temperature, where the battery cell assembly 1 supplies power to the first heating layer 151, and the first heating layer 151 heats the battery cell assembly 1 to improve the stability of the discharge rate of the battery cell assembly 1.
Further, the battery assembly 10 further includes a temperature sensor (not shown). The temperature sensor is provided within the package 15. The present application is not particularly limited to the specific location of the temperature sensor. The temperature sensor may be provided on the protection plate or inside the cell body 11. The temperature sensor is electrically connected to the controller, and the controller is configured to control the first heating layer 151 to enter the heating mode according to a temperature detection value of the temperature sensor.
Specifically, the temperature sensor is used for detecting the temperature of the battery cell main body 11, converting the temperature into an electrical signal, and sending the electrical signal to the controller. The controller receives the temperature of the temperature sensor to monitor the temperature of the battery cell main body 11 in real time, so that when the temperature of the battery cell main body 11 is lower than a quick charging interval before or during charging of the battery cell main body 11, the first heating layer 151 is controlled to heat the battery cell assembly 1; it is also convenient to stop the first heating layer 151 from heating the cell assembly 1 when the first heating layer 151 heats the cell assembly 1 to a higher temperature.
Referring to fig. 9, the package 15 further includes a second heating layer 158. The second heating layer 158 is disposed within the protective layer 155; alternatively, the second heating layer 158 is disposed between the protective layer 155 and the first adhesive layer; alternatively, the second heating layer 158 is disposed between the substrate layer 156 and the second glue layer; or alternatively. The second heating layer 158 is disposed within the base layer 156; alternatively, the second heating layer 158 is disposed on a side of the protective layer 155 facing away from the first adhesive layer; alternatively, the second heating layer 158 is disposed on a side of the substrate layer 156 facing away from the second glue layer.
The material of the second heating layer 158 includes, but is not limited to, one or more of graphite, nickel, aluminum, copper, stainless steel, positive temperature coefficient heating resistor (Positive Temperature Coefficient, PTC), alloy, etc.; or the material of the electric heating material comprises a multi-layer composite material formed by externally compounding one or more layers of polymer films. The shape of the second heating layer 158 includes, but is not limited to, heating wires, electric heating strips, and the like.
Alternatively, the shape of the second heating layer 158 may be wire-like, net-like, or line-like, etc. Since the first heating layer 151 needs to consider shielding performance, the material and shape of the first heating layer 151 are limited, so that the heating efficiency of the first heating layer 151 is affected to some extent. In this embodiment, the material of the second heating layer 158 may be set to be a material with higher electrical heat generating efficiency by providing the second heating layer 158, and by designing the shape of the second heating layer 158, the heating resistance of the second heating layer 158 in the effective area is relatively large, so that the electrical heat generating efficiency of the second heating layer 158 is higher from the structure, and the heat generating efficiency of the second heating layer 158 is further improved.
Optionally, the second heating layer 158 may cover part or all of the outer peripheral surface of the cell assembly 1.
In an embodiment, referring to fig. 10, the package 15 further includes a third conductive terminal 158a and a fourth conductive terminal 158b electrically connected to the second heating layer 158. The third conductive terminal 158a is electrically connected to the second conductive terminal 153. The battery assembly 10 also includes a fourth switch 164. The fourth switch 164 is electrically connected between the second electrode terminal 70 and the fourth conductive terminal 158b. The second switch 162 is connected between the end of the fourth switch 164, which is not connected to the fourth conductive terminal 158b, and the third conductive terminal 158 a.
Optionally, the third conductive terminal 158a is opposite or not opposite to the second conductive terminal 153, and the fourth conductive terminal 158b is opposite or not opposite to the second electrode terminal 70, which is not limited in the present application.
Referring to fig. 11, the controller controls the second switch 162 to be turned off and the fourth switch 164 to be turned on, and at this time, the first heating layer 151 and the second heating layer 158 are connected in series, so that the heating resistance of the package 15 is increased, the heating efficiency of the package 15 under a smaller current is improved, the package 15 is heated to a higher temperature faster under a smaller current, and the heating efficiency of the package 15 is improved.
Of course, in other embodiments, the controller controls the second switch 162 to be turned on and the fourth switch 164 to be turned off, and at this time, the first heating layer 151 heats the battery cell assembly 1, which may be suitable for a scenario with a relatively low heating rate.
Optionally, when the battery cell assembly 1 is charged at a low temperature, the controller controls the second switch 162 to be turned off and the fourth switch 164 to be turned on, so that the heating efficiency of the package 15 is higher, the temperature of the battery cell assembly 1 rises to a fast charging temperature interval at a very fast speed, and after the temperature of the battery cell assembly 1 reaches the fast charging temperature interval, the controller can control the second switch 162 to be turned on and the fourth switch 164 to be turned off, so that the heating efficiency of the package 15 is relatively slower, and the temperature of the battery cell assembly 1 is maintained in the fast charging temperature interval.
In one possible embodiment, referring to fig. 12, the battery assembly 10 further includes a peel-off tab 18. The easy-tearing adhesive 18 includes a base film 181, a third heating layer 182 disposed in the base film 181, and a third adhesive layer (not shown) disposed on the surface of the base film 181. The third glue layer adheres to the outer surface of the encapsulation 15.
Specifically, the peel-off tab 18 is a pull-up tab on the battery assembly 10 for facilitating removal of the battery assembly 10 from the battery compartment. The peel-off tape 18 is attached to the outer peripheral surface of the battery pack 10. The substrate film 181 of the easy-to-tear tape 18 of the present application is embedded with a third heating layer 182. The material of the third heating layer 182 includes, but is not limited to, one or more of graphite, nickel, aluminum, copper, stainless steel, positive temperature coefficient heating resistor (Positive Temperature Coefficient, PTC), alloy, etc.; or the material of the electric heating material comprises a multi-layer composite material formed by externally compounding one or more layers of polymer films. The shape of the third heating layer 182 includes, but is not limited to, heating wires, electric heating strips, and the like. In this embodiment, the third heating layer 182 is shaped as a heating wire, so that the thickness of the film of the easy-to-tear tape 18 is small and the film can be attached to the surface of the battery assembly 10 well.
Alternatively, the third heating layer 182 may be provided on the entire or partial outer circumferential surface of the battery assembly 10.
Through set up in easily tearing subsides 18 and easily tear subsides 18 to increase the function of easily tearing subsides 18, improve the utilization ratio of easily tearing subsides 18, still saved the space effectively when addding third heating layer 182, improving the heating efficiency of battery pack 10.
Referring to fig. 13 and 14, the third heating layer 182 includes a fifth conductive terminal 182a, a sixth conductive terminal 182b, and a fifth switch 165. One end of the fifth conductive terminal 182a is electrically connected to the first tab 12 or the first electrode terminal 60. The fifth switch 165 is electrically connected between the sixth conductive terminal 182b and the second electrode terminal 70.
In an embodiment, referring to fig. 15, the controller may control the second switch 162 to be turned off, the fourth switch 164 to be turned off, and the fifth switch 165 to be turned on, so that the third heating layer 182 heats the cell assembly 1 alone. This embodiment can be used in a scenario where the heating rate requirements for the cell assembly 1 are relatively low.
In addition, since the easy-to-tear tape 18 is likely to be separated from the cell main body 11, the third heating layer 182 of the easy-to-tear tape 18 is parallel to the first heating layer 151 and the second heating layer 158 of the aluminum plastic film, so that the heating circuit of the aluminum plastic film is not affected even after the easy-to-tear tape 18 is separated from the cell main body 11.
Further, the third heating layer 182 may be electrically connected to the first heating layer 151 through a conductive via. Specifically, the fifth conductive terminal 182a is electrically connected to the first heating layer 151 through a conductive via, and the sixth conductive terminal 182b is electrically connected to the second electrode terminal 70 through the fifth switch 165.
In one embodiment, referring to fig. 16, the battery assembly 10 includes a first heating layer 151, a second heating layer 158, and a third heating layer 182. The battery cell assembly 1 is rapidly heated at a low temperature, the controller controls the second switch 162 to be turned off, the fourth switch 164 to be turned on, and the fifth switch 165 to be turned off, at this time, the first heating layer 151 and the second heating layer 158 are connected in series, the heating resistance is large, the first heating layer 151 and the second heating layer 158 can be controlled to rapidly heat the battery cell assembly 1, and the temperature of the battery cell assembly 1 can be rapidly increased to a rapid charging temperature interval, so that the battery assembly 10 can be rapidly charged.
Referring to fig. 17, after the temperature of the battery module 1 reaches the fast charging temperature interval, the controller controls the fourth switch 164 to be turned off, the second switch 162 to be turned on, and the fifth switch 165 to be turned off, at this time, the first heating layer 151 heats the battery module 1, and compared with the first heating layer 151 and the second heating layer 158, the heating rate is relatively slower at this stage, so that the battery module 1 is maintained in the fast charging temperature interval, so that the battery module 10 can maintain fast charging.
Referring to fig. 15, as the temperature of the battery module 1 further increases, the controller controls the second switch 162 to be turned off, the fourth switch 164 to be turned off, and the fifth switch 165 to be turned on, so that the third heating layer 182 heats the battery module 1, and thus, the temperature of the battery module 1 can be controlled to keep warm or slowly heat, so that the battery module 10 can maintain fast charging.
The controller can control the second switch 162, the fourth switch 164 and the fifth switch 165 to select the heating resistor, adjust the heating resistance value, select different heating resistances in different heating temperature intervals to form different heating rates, and control the battery cell assembly 1 to quickly rise to the quick charge temperature, so that the temperature after reaching the quick charge temperature is not raised too quickly and is maintained at the quick charge temperature, so that the battery cell assembly 1 has a faster charge rate.
In other embodiments, a heating film may be coated on the outside of the battery assembly 10, and the heating film is an ultrathin film with a heating element built therein, and then attached to the outer surface of the battery assembly 10 by means of adhesion. The heating element is an electrical heating element. The thickness of the heating film is less than 0.1mm. One conductive terminal of the heating film is electrically connected with the first tab 12 of the battery assembly 10, and the other conductive terminal of the heating film is connected with the switch and then is converged with the second tab 13 of the battery assembly 10. When charging is started, if the temperature of the battery assembly 10 is at a lower temperature, i.e. less than the minimum value of the fast charging temperature interval, the heating film is communicated with the external power supply or the battery cell assembly 1, current is led to pass through the whole heating film, and the current loop generates heat to enable the temperature of the battery assembly 10 to rise to the fast charging temperature interval and then to start a normal fast charging mode.
It will be appreciated that the various embodiments of the application may be combined adaptively.
Referring to fig. 18, the embodiment of the application further provides a heating method of the battery assembly 10. The heating method may be used for the battery assembly 10 described in any of the above embodiments. The heating method includes the following steps.
110: the detection temperature of the temperature sensor is obtained.
120: determining a target heating mode among the first heating mode, the second heating mode and the third heating mode according to the detected temperature, and controlling the first heating layer 151 to heat in the target heating mode; the first heating mode is heating from a low temperature interval to a fast charging temperature interval; the second heating mode is heating from a low temperature zone to a high rate temperature; the third heating mode is to heat from the fast charge temperature interval to the high rate temperature interval. The minimum temperature value of the quick charge temperature interval is larger than the maximum temperature value of the low temperature interval; and the minimum temperature value of the high-rate temperature interval is larger than the maximum temperature value of the quick charge temperature interval.
Specifically, the low temperature range is less than 10 ℃. The rapid charging temperature range is 10-45 ℃, not including 10 ℃, and including 45 ℃; the high-rate temperature range is 45-60 ℃, excluding 45 ℃ and including 60 ℃.
For the charging rate, the charging rate of the battery cell assembly 1 in the low-temperature interval is smaller than the rated quick charging rate, the charging rate of the battery cell assembly 1 in the quick charging temperature interval is the rated quick charging rate, and the charging rate of the battery cell assembly 1 in the high-rate temperature interval is larger than the rated quick charging rate.
Specifically, whether the detected temperature is less than or equal to the minimum value of the low temperature section is detected. If the detection result is yes, determining that the first heating mode or the second heating mode is the target heating mode.
When charging is started, if the temperature of the battery assembly 10 is less than the minimum value of the fast charge temperature interval, that is, the temperature of the battery assembly 10 is in the low temperature interval, the controller determines that the target heating mode is the first heating mode or the second heating mode.
Optionally, the controller controls the first heating layer 151 to switch on an external power source, so that the first heating layer 151 heats the battery cell assembly 1 to a temperature rising to a fast charging temperature interval, and then controls the first heating layer 151 to stop heating the battery cell assembly 1 or heat the battery cell assembly 1 at a slow speed.
In connection with the above embodiment of the battery assembly 10 having the first heating layer 151, the second heating layer 158, and the third heating layer 182, the controller controls the first heating layer 151 and the second heating layer 158 to heat the battery assembly 1 to the rapid charging temperature interval, and then controls the third heating layer 182 to individually heat the battery assembly 1. Or, the controller controls the first heating layer 151 and the second heating layer 158 to heat the cell assembly 1 until the temperature rises to a fast charge temperature interval, and then controls the first heating layer 151 to independently heat the cell assembly 1. Or, the controller controls the first heating layer 151 and the second heating layer 158 to heat the cell assembly 1 until the temperature rises to a fast charge temperature interval, and then controls the first heating layer 151 and the third heating layer 182 to heat the cell assembly 1.
Optionally, the controller controls the first heating layer 151 to heat the cell assembly 1 to a temperature range with a high rate after the temperature of the cell assembly 1 rises, and then controls the first heating layer 151 to stop heating the cell assembly 1 or to heat the cell assembly 1 at a slow speed.
In connection with the above embodiment of the battery assembly 10 having the first heating layer 151, the second heating layer 158, and the third heating layer 182, the controller controls the first heating layer 151 and the second heating layer 158 to heat the battery assembly 1 to a temperature range of high rate, and then controls the third heating layer 182 to heat the battery assembly 1 alone. Or, the controller controls the first heating layer 151 and the second heating layer 158 to heat the cell assembly 1 until the temperature rises to a high-rate temperature range, and then controls the first heating layer 151 to independently heat the cell assembly 1. Alternatively, the controller controls the first heating layer 151 and the second heating layer 158 to heat the cell assembly 1 to a temperature range where the temperature is increased to a high rate, and then controls the first heating layer 151 and the third heating layer 182 to heat the cell assembly 1.
If the detection result is negative, detecting whether the detection temperature is less than or equal to the minimum value of the high-rate temperature section, and if the detection result is positive, determining that the third heating mode is the target heating mode.
When the temperature of the battery assembly 10 is already within the fast charging temperature range, the controller controls the first heating layer 151 to switch on the external power source, so that the first heating layer 151 heats the battery assembly 1 to a temperature rising to a higher temperature range, and then charges the battery assembly 1, at this time, the battery assembly 1 can be charged at a larger charging rate. For example, the battery cell assembly 1 is normally and rapidly charged to 1.5 ℃ at room temperature, and a 3C rapid charging mode is started after the battery cell assembly is heated to 50 ℃; in this mode, the heating temperature cannot exceed the upper temperature limit at which the battery can store, for example, 60 ℃ at which the battery can store, and the heating temperature cannot exceed this temperature.
Referring to fig. 19, fig. 19 is a graph showing the capacity of the 0.7C cell assembly 11 as 5mAh charged at 0.7C at normal temperature 25℃ and charged at 1.5C rate after heating to 50℃. From the graph, it can be seen that the normal temperature full charge time is 155min. And the charging time of the lifting multiplying power after heating is shortened to 88min. It can be seen that the charging speed of the battery after heating can be greatly increased.
The present application provides structural improvements to the battery assembly 10 and controls the battery assembly 10 to enter a self-heating mode by improving the heating method of the battery assembly 10. This is the case. The electrochemical reaction speed inside the battery cell assembly 1 is awakened at low temperature, and the electrochemical reaction speed inside the battery cell assembly 1 can be improved at normal charging temperature, so that the charging multiplying power of the battery cell assembly 1 can be greatly improved. The package 15 of the battery pack 10 is heated to heat the inside of the battery pack 10 to a target charging temperature, and then charged with a corresponding charging current. On the one hand, the charging rate of the battery assembly 10 at low temperature can be improved, and meanwhile, the rated charging rate designed by the battery assembly 10 can be broken through, so that the charging rate of the battery assembly 10 is greatly improved.
While the foregoing is directed to embodiments of the present application, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the application, and such changes and modifications are intended to be included within the scope of the application.
Claims (15)
1. A battery assembly, comprising:
the battery cell assembly comprises a battery cell main body and a first tab and a second tab which are electrically connected with the battery cell main body; a kind of electronic device with high-pressure air-conditioning system
The packaging piece is coated on the outer peripheral surface of the battery cell assembly and comprises a first heating layer, a first conductive terminal and a second conductive terminal, wherein the first conductive terminal and the second conductive terminal are electrically connected with the first heating layer;
the temperature sensor is used for detecting the temperature of the battery cell main body; a kind of electronic device with high-pressure air-conditioning system
The controller is used for acquiring the detection temperature of the temperature sensor, determining a target heating mode in a first heating mode, a second heating mode and a third heating mode according to the detection temperature, and controlling the first heating layer to heat in the target heating mode; the first heating mode is heating from a low temperature interval to a fast charging temperature interval; the second heating mode is heating from a low temperature interval to a high rate temperature interval; the third heating mode is to heat from a fast charging temperature interval to a high-rate temperature interval, wherein the minimum temperature value of the fast charging temperature interval is larger than the maximum temperature value of the low-temperature interval; the minimum temperature value of the high-rate temperature interval is larger than the maximum temperature value of the quick charge temperature interval; the charging rate of the battery cell assembly in the low-temperature interval is smaller than the rated quick charging rate, the charging rate of the battery cell assembly in the quick charging temperature interval is the rated quick charging rate, and the charging rate of the battery cell assembly in the high-rate temperature interval is larger than the rated quick charging rate.
2. The battery assembly of claim 1, wherein the package is an aluminum plastic film and the first heating layer is aluminum foil.
3. The battery assembly of claim 2, further comprising a first electrode terminal, a second electrode terminal, a first switch, and a second switch, the first electrode terminal, the second electrode terminal being configured to input a charging current for charging the battery cell assembly, to input a heating current for the first heating layer, and to output a discharging current for the battery cell assembly; the first electrode lug is electrically connected with the first electrode end, the first switch is electrically connected between the second electrode end and the second electrode lug, and the second switch is electrically connected between the second electrode end and the second conductive terminal.
4. The battery assembly of claim 3, wherein the controller is configured to control the second switch to be on and the first switch to be off in a heating mode; the controller is also used for controlling the first switch to be switched on and the second switch to be switched off in a charging mode; the controller is also used for controlling the first switch and the second switch to be conducted in a heating charging mode.
5. The battery assembly of claim 4, further comprising an isolation circuit electrically connected between the second electrode terminal and the second conductive terminal for isolating current of the cell assembly from current of the first heating layer in the heating charging mode.
6. The battery pack of claim 5, wherein the isolation circuit comprises at least one isolation resistor and a third switch, one end of the isolation resistor is electrically connected to the second electrode terminal, the other end of the isolation resistor is electrically connected to the third switch, and the other end of the third switch is electrically connected to the second conductive terminal; the controller is used for controlling the third switch to be conducted and the second switch to be disconnected in the heating charging mode.
7. The battery assembly of claim 4, wherein the temperature sensor is disposed within the package, the temperature sensor being electrically connected to the controller.
8. The battery assembly of claim 3, wherein the package further comprises a protective layer, a first adhesive layer, the first heating layer, a second adhesive layer, and a base layer, which are sequentially stacked, the package further comprising a second heating layer, the second heating layer being disposed within the protective layer; or the second heating layer is arranged between the protective layer and the first adhesive layer; or the second heating layer is arranged between the substrate layer and the second adhesive layer; or the second heating layer is arranged in the substrate layer; or the second heating layer is arranged on one side of the protective layer, which is away from the first adhesive layer; or, the second heating layer is arranged on one side of the substrate layer away from the second adhesive layer.
9. The battery assembly of claim 8, wherein the package further comprises a third conductive terminal and a fourth conductive terminal electrically connected to the second heating layer, the third conductive terminal electrically connected to the second conductive terminal, the battery assembly further comprising a fourth switch connected between the second electrode terminal and the fourth conductive terminal.
10. The battery assembly of claim 3, further comprising a peel-off tab comprising a base film, a third heating layer disposed within the base film, and a third glue layer disposed on a surface of the base film, the third glue layer adhering to an outer surface of the package.
11. The battery assembly of claim 10, wherein the third heating layer comprises a fifth conductive terminal, a sixth conductive terminal, and a fifth switch, wherein one end of the fifth conductive terminal is electrically connected to the first tab, and wherein the fifth switch is electrically connected between the sixth conductive terminal and the second electrode terminal.
12. An electronic device comprising a battery assembly according to any one of claims 1 to 11.
13. The battery module heating method is characterized in that the battery module comprises a battery module, a packaging piece, a temperature sensor and a controller, wherein the battery module comprises a battery main body, the packaging piece is coated on the peripheral surface of the battery module, and the packaging piece comprises a first heating layer; the temperature sensor is used for detecting the temperature of the battery cell main body; the method comprises the following steps:
acquiring the detection temperature of the temperature sensor;
determining a target heating mode in a first heating mode, a second heating mode and a third heating mode according to the detected temperature, and controlling the first heating layer to heat in the target heating mode; the first heating mode is heating from a low temperature interval to a fast charging temperature interval; the second heating mode is heating from a low temperature interval to a high rate temperature interval; the third heating mode is to heat from a fast charging temperature interval to a high-rate temperature interval, wherein the minimum temperature value of the fast charging temperature interval is larger than the maximum temperature value of the low-temperature interval; the minimum temperature value of the high-rate temperature interval is larger than the maximum temperature value of the quick charge temperature interval; the charging rate of the battery cell assembly in the low-temperature interval is smaller than the rated quick charging rate, the charging rate of the battery cell assembly in the quick charging temperature interval is the rated quick charging rate, and the charging rate of the battery cell assembly in the high-rate temperature interval is larger than the rated quick charging rate.
14. The heating method of the battery pack according to claim 13, wherein the determining a target heating mode among the first heating mode, the second heating mode, and the third heating mode according to the detected temperature, and controlling the first heating layer to heat in the target heating mode, comprises:
detecting whether the detected temperature is smaller than or equal to the minimum value of the low temperature interval, if so, determining a first heating mode or a second heating mode as a target heating mode, wherein the first heating mode is a temperature interval from the low temperature interval to the quick charge; the second heating mode is heating from a low temperature interval to a high rate temperature interval;
if the detection result is negative, determining a third heating mode as a target heating mode, wherein the third heating mode is heating from the rapid charging temperature interval to the high-rate temperature interval; the minimum temperature value of the quick charge temperature interval is larger than the maximum temperature value of the low temperature interval; and the minimum temperature value of the high-rate temperature interval is larger than the maximum temperature value of the quick charge temperature interval.
15. The heating method of the battery pack according to claim 13, wherein the low temperature range is less than 10 ℃, and the fast charge temperature range is more than 10 ℃ and 45 ℃ or less; the high-rate temperature interval is more than 45 ℃ and less than 60 ℃.
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| CN202011385766.8A CN112510296B (en) | 2020-11-30 | 2020-11-30 | Battery assembly, heating method thereof and electronic equipment |
| PCT/CN2021/124420 WO2022111126A1 (en) | 2020-11-30 | 2021-10-18 | Battery assembly and heating method therefor, and electronic device |
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| CN112510296B (en) * | 2020-11-30 | 2023-08-11 | Oppo广东移动通信有限公司 | Battery assembly, heating method thereof and electronic equipment |
| CN113178612B (en) * | 2021-04-27 | 2023-12-15 | Oppo广东移动通信有限公司 | Battery assembly, control method thereof and electronic equipment |
| CN113690513B (en) * | 2021-08-18 | 2023-08-29 | Oppo广东移动通信有限公司 | Battery module and electronic device |
| CN113782811B (en) * | 2021-09-13 | 2023-02-28 | 宁德新能源科技有限公司 | Electric equipment and method for heating electrochemical device |
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