CN112510296A

CN112510296A - Battery assembly, heating method thereof and electronic equipment

Info

Publication number: CN112510296A
Application number: CN202011385766.8A
Authority: CN
Inventors: 谢红斌; 陈伟
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-03-16
Anticipated expiration: 2040-11-30
Also published as: WO2022111126A1; CN112510296B

Abstract

According to the battery assembly, the heating method of the battery assembly and the electronic equipment, the battery assembly comprises the battery core assembly and the packaging piece, the battery core assembly comprises a battery core main body and a first electrode lug and a second electrode lug which are electrically connected with the battery core main body. The packaging piece is coated on the peripheral surface of the electric core component 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, far away from the first heating layer, of the first conductive terminal is used for being connected with the first lug. And one end of the second conductive terminal, which is far away from the first heating layer, is used for connecting the second tab. The application provides a battery pack, a heating method of the battery pack and electronic equipment, wherein the battery pack can improve the charging rate of the battery pack and reduce the whole volume of the electronic equipment.

Description

Battery assembly, heating method thereof and electronic equipment

Technical Field

The application relates to the technical field of electronics, in particular to a battery pack, a heating method of the battery pack and electronic equipment.

Background

The charging rate of the battery is affected by the temperature of the battery, for example, the charging efficiency of the battery is low at low temperature, and with the pursuit of the lightness and thinness of the electronic equipment, how to reduce the overall volume of the electronic equipment is also the important research of the technicians. Therefore, how to increase the charging rate of the battery and reduce the overall size of the electronic device becomes a technical problem to be solved.

Disclosure of Invention

The application provides a battery pack, a heating method of the battery pack and an electronic device, wherein the charging rate of the battery pack is improved, and the overall size of the electronic device is reduced.

In a first aspect, an embodiment of the present application provides a battery assembly, including: the battery core assembly comprises a battery core main body, a first tab and a second tab, wherein the first tab and the second tab are electrically connected with the battery core main body; and the packaging part is coated on the outer peripheral surface of the battery cell component, the packaging part comprises a first heating layer and an electric connection part, wherein the first conductive terminal and the second conductive terminal of the first heating layer are used for heating the battery cell main body, the first conductive terminal is far away from one end of the first heating layer and used for connecting the first lug, and the second conductive terminal is far away from one end of the first heating layer and used for connecting the second lug.

In a second aspect, an electronic device provided by an embodiment of the present application includes the battery assembly.

In a third aspect, an embodiment of the present application provides a heating method for a battery assembly, where the battery assembly includes an electric core assembly, a package, a temperature sensor, and a controller, the package is wrapped around an outer circumferential surface of the electric core 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 among 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 a heating range from a low-temperature range to a quick-charging temperature range; the second heating mode is heating from a low-temperature range to a high-magnification temperature; the third heating mode is a heating mode from a quick charging temperature interval to a high-magnification temperature interval, wherein the minimum temperature value of the quick charging temperature interval is greater than the maximum temperature value of the low temperature interval; and the minimum temperature value of the high-multiplying-power temperature interval is greater than the maximum temperature value of the quick-charging temperature interval.

According to the battery assembly provided by the embodiment, the first heating layer is designed in the packaging part and is used for heating the electric core assembly, so that the charging rate of the battery assembly is improved, the internal structure of the packaging part is improved by the first heating layer, and the internal structure of the electric core assembly is not influenced, so that the size and the internal electrochemical reaction of the electric 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 pole lug of the battery pack, and the second conductive terminal of the first heating layer is used for being electrically connected with the second pole lug of the battery pack, so that the heating loop can be multiplexed with partial branches of the charging loop, the integration level of an electronic circuit is improved, and the whole volume of the battery pack is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure;

FIG. 2 is an exploded view of the electronic device provided in FIG. 1;

FIG. 3 is a schematic perspective view of a battery pack provided in FIG. 1;

fig. 4 is a schematic cross-sectional view of a battery pack provided in fig. 1;

FIG. 5 is a schematic diagram of the circuit configuration of the battery pack 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 of 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 partial cross-sectional view 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 pack provided in fig. 3;

FIG. 13 is a schematic circuit diagram of the first heating layer and the third heating layer of the battery assembly provided in FIG. 12;

FIG. 14 is a schematic diagram of the 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 diagram of the circuit configuration of the battery assembly provided in FIG. 14 in a first heating state;

fig. 16 is a schematic diagram of the circuit configuration of the battery assembly provided in fig. 14 in a second heating state;

fig. 17 is a schematic diagram of the circuit configuration of the battery module provided in fig. 14 in a third heating state;

fig. 18 is a flowchart of a method for heating a battery assembly according to an embodiment of the present disclosure;

fig. 19 is a graph of a cell assembly having a capacity of 5mAh charged at 0.7C at 25C at normal temperature and 1.5C rate after heating to 50℃.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The embodiments listed in the present application may be appropriately 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 present disclosure. The electronic device 100 may be a phone, a television, a tablet, a cell phone, a camera, a personal computer, a laptop, a wearable device, an electric car, an airplane, and other rechargeable devices. Referring to fig. 1, in the present application, an electronic device 100 is taken as an example for description, and a person skilled in the art can easily think of structural design for 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 provided in 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 middle frame 30, and a rear cover 40. The display screen 20, the middle frame 30 and the rear cover 40 are fixedly connected in sequence. The battery pack 10 is provided in the center frame 30. The battery pack 10 is used to supply power to the display panel 20 and a main board or the like provided on the middle frame 30.

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, ferroelectric batteries, nano batteries, and the like. In the embodiment of the present application, the battery pack 10 is exemplified as a lithium ion battery, and those skilled in the art can easily conceive of designing other types of batteries according to the technical means of the 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 form, an arc form, a soft pack square, a cylindrical form, a prismatic form, a special shape, or the like.

Referring to fig. 3, in the present embodiment, the battery assembly 10 includes the battery assembly 1, and the first electrode terminal 60 and the second electrode terminal 70 electrically connected to the battery 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 for inputting a charging current for charging the cell assembly 1 and outputting a discharging current of the cell assembly 1.

Optionally, the first electrode end 60 and the second electrode end 70 may be disposed in a flexible circuit board and electrically connected to a battery docking interface on the motherboard through a lead interface of the flexible circuit board, so as to be electrically connected to the USB charging interface 50 on the middle frame 30 (see fig. 2) or discharge devices in the electronic device 100.

Optionally, the first electrode end 60 and the second electrode end 70 are disposed on the surface of the housing of the battery module 1 at intervals, and exist in an exposed form, and the first electrode end 60 and the second electrode end 70 are electrically connected to the positive terminal and the negative terminal in the battery compartment, respectively, and further electrically connected to the USB charging interface 50 (see fig. 2) on the middle frame 30 or used for discharging devices in the electronic device 100.

Referring to fig. 3, the cell assembly 1 includes a 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 pole piece 111, a second pole piece 112, a diaphragm 113, and an electrolyte 114.

The first pole piece 111 is a positive pole piece, and the second pole piece 112 is a negative pole piece; alternatively, the first pole piece 111 is a negative pole piece, and the second pole piece 112 is a positive pole piece. 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 electrode sheet 111 includes a positive electrode current collector and a positive electrode material disposed on the positive electrode current collector. For example, the positive electrode current collector is an aluminum foil with a thickness of 10-20 microns. The anode material comprises transition metal oxide or polyanion compound with layered or spinel structure with high electrode potential and stable structure, such as lithium cobaltate, lithium manganate, lithium iron phosphate, ternary material and the like. The positive electrode material further 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 an interval for preventing the first pole piece 111 and the second pole piece 112 from directly contacting. The separator 113 is a specially formed polymer film, and the separator 113 has a microporous structure, so that lithium ions can freely pass through the microporous structure, but electrons cannot pass through the microporous structure. 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 and

second electrode sheets

111 and 112, such that the first electrode sheet 111 consumes electrons and the second electrode sheet 112 generates electrons.

The application does not specifically limit the type of the cell main body 11, and the cell main body 11 may form a laminated cell, that is, the first pole piece 111, the diaphragm 113, the second pole piece 112, the diaphragm 113, the first pole piece 111, the diaphragm 113, and the second pole piece 112 … … are sequentially disposed, or may form a wound cell, that is, the first pole piece 111, the diaphragm 113, and the second pole piece 112 are disposed in a laminated manner 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 pole piece 112. The connection mode includes but is not limited to integral molding, welding, conductive adhesive bonding and the like. During charging of the battery assembly 10, the first tab 12 is electrically connected to or forms a first electrode terminal 60 of the battery assembly 10, and the second tab 13 is electrically connected to or forms a 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 wrapped around the outer periphery of the core assembly 1. The package 15 is configured to package the first pole piece 111, the second pole piece 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 an undeformable structure. The initial substrate of the package 15 is a wafer structure. The package member 15 is deformable to form a receiving slot during punching, the first pole piece 111, the second pole piece 112, and the diaphragm 113 are disposed in the receiving slot, and then the package member 15 is wrapped on the outer circumferential surface of the cell main body 11, the package member 15 and the cell main body 11 are compressed, and the edge of the package member 15 is sealed, so that the package member 15 is tightly wrapped on the cell main body 11, thereby reducing the packaging volume of the battery assembly 10.

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 to heat the cell main body 11. The first conductive terminal 152 and the second conductive terminal 153 are respectively connected to two poles of a heating power supply, so that when a heating loop formed by the first conductive terminal 152, the first heating layer 151 and the second conductive terminal 153 has current flowing, the first heating layer 151 generates heat, and since the first heating layer 151 is disposed in the package member 15 and the package member 15 is wrapped on the outer circumferential surface of the electric core assembly 1, the first heating layer 151 is used for heating the electric core assembly 1. This application is through setting up first zone of heating 151 to packaging part 15, and this first zone of heating 151 is close to electric core subassembly 1 and surrounds electric core subassembly 1, so can carry out the even heating to electric core subassembly 1, and the heat of heating can conduct to electric core subassembly 1 fast, has improved heat conduction efficiency.

In this embodiment, the package 15 is a multi-layer structure, and is pressed to form a composite film layer, wherein the multi-layer structure includes at least one first heating layer 151, and other layer structures are illustrated in the following. The material of the first heating layer 151 includes, but is not limited to, an electric heating material. That is, the first heating layer 151 is made of a conductive material. The electric heating material includes but is not limited to one or more of graphite, nickel, aluminum, copper, stainless steel, Positive Temperature Coefficient heating resistor (PTC), alloy, etc.; or the material of the electric heating material comprises a multi-layer composite material formed by compounding one or more layers of high molecular films outside the material. Here, the first heating layer 151 is a structure of the package 15 itself, and may be a structure added in the package 15. In other embodiments, the package 15 may be a single layer film, which is the first heating layer 151.

In this embodiment, one end of the first conductive terminal 152, which is far away from the first heating layer 151, is used for connecting the first tab 12, and one end of the second conductive terminal 153, which is far 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. The specific connection manner includes, but is not limited to, fixedly connecting the first conductive terminal 152 and the first tab 12 by welding, hot press forming, 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 by a conductive wire, a conductive adhesive, or the like. So, the heating circuit of first zone of heating 151 and the charging circuit of electric core subassembly 1 at least part can be multiplexing, when realizing that first zone of heating 151 heats electric core subassembly 1, can also reduce the area that heating circuit occupied, reduce battery assembly 10's whole volume.

Referring to fig. 4 and 5, one end of the first tab 12 is disposed in the package member 15 and electrically connected to the first pole piece 111, and the other end of the first tab 12 extends out of the package member 15 and is electrically connected to the first electrode terminal 60 of the battery assembly 10. The first conductive terminal 152 is electrically connected to one end of the first tab 12 extending out of 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 member 15 and electrically connected to the second electrode 112, and the other end of the second tab 13 extends out of the package member 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 tab 13, and specifically, the end of the second conductive terminal 153 away from the first heating layer 151 can be electrically connected to the second tab 13 through a switch. Because the first heating layer 151 is made of a conductive material, when the second tab 13 does not need to be electrically connected to the first heating layer 151, an insulating adhesive 154 may be disposed between the second tab 13 and the package 15 or between the second tab 13 and the first heating layer 151 for sealing.

Optionally, the first conductive terminal 152 is opposite or not opposite to the first tab 12, and the second conductive terminal 153 is opposite or not opposite to the second tab 13, which is not limited in this application.

In the battery assembly 10 provided by this embodiment, the first heating layer 151 is designed in the package 15, and the first heating layer 151 heats the battery assembly 1, so that the temperature inside the battery body 11 can be quickly increased, and further the electrochemical reaction speed inside the battery assembly 1 is increased, thereby increasing the charging rate of the battery assembly 10, and the first heating layer 151 is an improvement on the internal structure of the package 15 without affecting the internal structure of the battery assembly 1, so that the volume of the battery assembly 1 and the internal electrochemical reaction 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 assembly 1, and the end of the second conductive terminal 153 away from the first heating layer 151 is electrically connected to the second tab 13 of the battery assembly 1, so that the heating circuit can be reused with part of the branches of the charging circuit, thereby improving the integration level of the electronic circuit and reducing the overall volume of the battery assembly 10.

It will be appreciated that the present embodiment provides a battery assembly 10 that is a self-heating battery, since the heating layer is located within the battery assembly 10.

In one embodiment, referring to fig. 4, the package member 15 is an aluminum-plastic film, which can make the battery assembly 10 have high oxygen barrier, moisture-proof, and puncture-resistant characteristics. 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 sequentially stacked. The base layer 156 is adjacent to the cell body 11. The material of the protection layer 155 includes, but is not limited to, nylon. The protective layer 155 serves to improve the wear resistance of the battery assembly 10 and 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 heat sealing of the aluminum plastic film and the tab.

The first heating layer 151 is an aluminum foil. The first conductive terminal 152 and the second conductive terminal 153 are two conductive terminals disposed on the first heating layer 151.

In the embodiment, the aluminum foil in the aluminum-plastic film is designed into the first heating layer 151 for heating the electric core assembly 1 by utilizing the capability of generating heat when the aluminum foil in the aluminum-plastic film is electrified, the structure of the aluminum foil is improved, and two conductive terminals are designed to respectively form the first conductive terminal 152 and the second conductive terminal 153; the first heating layer 151 does not need to be additionally arranged, namely, the hierarchical structure of the aluminum-plastic film does not need to be greatly improved, the cost and the working procedure are saved, and the thickness of the aluminum-plastic film can be reduced. This embodiment makes full use of the aluminum foil in the aluminum-plastic film, so that the aluminum foil not only has the functions of reflecting heat and shielding electromagnetic waves, but also has the function of heating the cell assembly 1, so that the function of the cell assembly 10 is increased, the volume of the cell assembly 10 is not additionally increased, and the miniaturization of the cell assembly 10 is promoted.

Of course, in other embodiments, the first heating layer 151 may be a film layer additionally disposed in the aluminum plastic film. Specifically, the first heating layer 151 may be disposed on at least one of a side of the protective layer 155 away from the substrate layer 156, a side of the protective layer 155 away from the first adhesive layer, a side of the first adhesive layer away from the aluminum foil, a side of the aluminum foil away from the second adhesive layer, a side of the second adhesive layer away from the substrate. Optionally, the first heating layer 151 may be further embedded in at least one of the protection layer 155, the first adhesive layer, the aluminum foil, the second adhesive layer, and the substrate layer 156. It is understood that the number of the first heating layers 151 may be one or more.

In one 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 pole ear 13 and the second conductive terminal 153 are merged 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 electrical connection relationship between the second tab 13 and the second electrode terminal 70, and a first switch 161 is arranged between the second tab 13 and the second electrode terminal 70, and the first switch 161 is a switch for controlling the on/off of the charging circuit; and a second switch 162 is disposed between the second electrode terminal 70 and the second conductive terminal 153, and the second switch 162 is a switch for controlling the on/off of the heating circuit, so as to control the charging mode of the electric core assembly 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 switched on and controlling the first switch 161 to be switched 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 and charging mode. Wherein the heating mode is a mode in which the controller controls the heating of the first heating layer 151. Wherein, the heating modes include a first heating mode for supplying the first heating layer 151 with the external power and a second heating mode for supplying the first heating layer 151 with the power core assembly 1. The charging mode is a mode in which the controller controls the charging of the cell assembly 1. The heating charging mode is a mode in which the first heating layer 151 is heated while the electric core 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 a 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 electric core assembly 1, and the electric core assembly 1 is not charged. This application case can be used in the case of very low temperature, the reaction rate of the electrochemical reaction inside the cell assembly 1 at the very low temperature is low, which results in that the battery assembly 10 cannot be charged at the normal rapid charging rate, so that the electronic device 100 can be connected to the power source, and the controller controls the first heating layer 151 to heat the cell assembly 1, so that the battery assembly 10 enters the self-heating mode.

Referring to fig. 7, when the temperature of the cell assembly 1 reaches a fast charging temperature range (e.g., 10 to 45 ℃), the second switch 162 may be controlled to be turned on to start charging the cell assembly 1, and since the temperature of the cell assembly 1 has reached the fast charging temperature range, the cell assembly 1 may be charged at a fast charging rate, and at this time, the second switch 162 may be controlled to be turned off, and the first heating layer 151 stops heating the cell assembly 1, so that the battery assembly 10 enters a charging mode. Alternatively, the heating of the cell assembly 1 is continued to bring the battery assembly 10 into the charging heating mode.

Specifically, because the temperature of electric core subassembly 1 has been located the temperature interval of filling soon, charge under the quick charge multiplying power, can produce certain heat when electric core subassembly 1 charges yet for electric core subassembly 1 keeps charging with the quick charge multiplying power in the temperature interval of filling soon, and electric core subassembly 1 can charge to saturation fast, so the steerable first zone of heating 151 of controller stops heating electric core subassembly 1 after heating to the temperature interval of filling soon, in order to save the electric energy.

Specifically, since the charging rate of the battery pack 1 is related to the temperature, when the temperature of the battery pack 1 reaches the fast charging temperature interval, the battery pack 1 can be controlled to be charged while the first heating layer 151 continues to heat the battery pack 1, so that the battery pack 1 is charged at a high charging rate (for example, the high charging rate exceeds the rated charging rate), and the charging rate of the battery pack 10 is further improved.

The first switch 161 and the second switch 162 are controlled to be switched off and switched on by the controller, so that the first heating layer 151 is controlled to heat the cell assembly 1, and the cell assembly 1 is controlled to be charged, so that the cell assembly 1 is charged at a proper temperature interval with a high charging rate or a high charging rate, and the charging speed of the 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 end 70 and the second conductive terminal 153. The isolation circuit 170 serves to isolate the electric core assembly 1 from the first heating layer 151 in the heating charging mode. Specifically, the isolation circuit 170 is used to isolate the current of the electric core assembly 1 from the current of the first heating layer 151 in the heating and charging mode, so that mutually independent parallel branches are formed between the electric core assembly 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, and so on. The number of the third switches 163 may be one or more, and is not limited herein.

In the present embodiment, the numbers of the isolation resistor 171 and the third switch 163 are illustrated as one example. 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 to control the conduction of the second switch 162 or the conduction of the third switch 163 in the heating mode.

Specifically, when the first electrode terminal 60 and the second electrode terminal 70 of the battery assembly 10 are connected 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, at which time the first heating layer 151 is connected 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 powered on, 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 electric core assembly 1 supplies power to the first heating layer 151, and the first heating layer 151 heats the electric core assembly 1. This embodiment can be applied to under the low temperature scene, and electricity core subassembly 1 heats electricity core subassembly 1 in advance when putting through external power, so, makes electricity core subassembly 1 be in the temperature interval that fills soon when putting through external power, so, can make electricity core subassembly 1 quick charge. This embodiment can also be used for the unstable discharge rate of the cell assembly 1 at low temperature, the cell assembly 1 supplies power to the first heating layer 151, and the first heating layer 151 heats the cell assembly 1, so as to improve the stability of the discharge rate of the cell assembly 1.

Further, the battery assembly 10 also includes a temperature sensor (not shown). The temperature sensor is provided in the package 15. The specific location of the temperature sensor is not specifically limited in this application. The temperature sensor may be provided on the protection plate or inside the cell main 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 configured to detect a temperature of the cell main body 11, convert the temperature into an electrical signal, and send the electrical signal to the controller. The controller receives the temperature of the temperature sensor to monitor the temperature of the cell main body 11 in real time, so that when the temperature of the cell main body 11 is lower than a rapid charging interval before or during charging of the cell main body 11, the first heating layer 151 is controlled to heat the cell assembly 1; it is also convenient to stop the first heating layer 151 from heating the electric core assembly 1 when the first heating layer 151 heats the electric core 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 provided 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 base 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 protection layer 155 away from the first adhesive layer; alternatively, the second heating layer 158 is provided 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 (PTC) heating resistor, alloy, and the like; or the material of the electric heating material comprises a multi-layer composite material formed by compounding one or more layers of high molecular films outside the material. The shape of the second heating layer 158 includes, but is not limited to, a heating wire, a heating sheet, and the like.

Alternatively, the second heating layer 158 may be shaped like a wire, a net, a wire bar, or the like. Since the first heating layer 151 needs to consider shielding performance, the material and shape of the first heating layer 151 are limited to some extent, so that the heating efficiency of the first heating layer 151 is affected to some extent. This embodiment is through setting up second zone of heating 158, and the material of second zone of heating 158 can set up to the higher material of electricity heat production efficiency, designs through the shape to second zone of heating 158 to make the heating resistance value of second zone of heating 158 in effectual area great relatively, so that second zone of heating 158 is higher from structural electricity heat production efficiency, and then improves the heat production efficiency of second zone of heating 158.

Alternatively, the second heating layer 158 may be coated on a part or the entire outer circumferential surface of the electric core assembly 1.

In one 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 158 b. The second switch 162 is connected between the end of the fourth switch 164 not connected to the fourth conductive terminal 158b and the third conductive terminal 158 a.

Optionally, the third conductive terminal 158a is opposite to or not opposite to the second conductive terminal 153, and the fourth conductive terminal 158b is opposite to or not opposite to the second electrode terminal 70, which is not limited in this 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 as to increase the heating resistance of the package 15, improve the heating efficiency of the package 15 under a smaller current, and heat the package 15 to a higher temperature under a smaller current, thereby improving the heating efficiency of the package 15.

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 the first heating layer 151 heats the electric core assembly 1, which may be suitable for relatively low heating rate scenarios.

Optionally, when the electric core 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 relatively high, the temperature of the electric core assembly 1 is increased to a fast charging temperature interval at a very fast speed, and after the temperature of the electric core assembly 1 reaches the fast charging temperature interval, the controller controls 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 slow, and the temperature of the electric core assembly 1 is maintained at the fast charging temperature interval.

In one possible embodiment, referring to fig. 12, the battery assembly 10 further includes a tear tab 18. The easy-to-tear tape 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 a surface of the base film 181. The third glue layer adheres to the outer surface of the package 15.

Specifically, peel tab 18 is a lift tab on battery assembly 10 for facilitating removal of battery assembly 10 from a battery compartment. The easy-tear tape 18 is attached to the outer peripheral surface of the battery pack 10. The embedded third zone of heating 182 that is equipped with of basement membrane 181 of this application design easy tear subsides 18. The third heating layer 182 is made of one or more materials, such as graphite, nickel, aluminum, copper, stainless steel, Positive Temperature Coefficient (PTC) heating resistor, alloy, etc.; or the material of the electric heating material comprises a multi-layer composite material formed by compounding one or more layers of high molecular films outside the material. The shape of the third heating layer 182 includes, but is not limited to, a heating wire, a heating sheet, and the like. In this embodiment, the third heating layer 182 is a heating wire, so that the easy-to-tear tape 18 has a small film thickness and 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 a partial outer circumferential surface of the cell assembly 10.

Through set up easily tearing subsides 18 in easily tearing subsides 18 to increase easily tearing the function of subsides 18, improve the utilization ratio of easily tearing subsides 18, still saved the space effectively when addding third zone of heating 182, improving battery pack 10's heating efficiency.

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 one 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 alone heats the electric core assembly 1. This embodiment can be used in scenarios where the heating rate requirements for the electric core assembly 1 are relatively low.

In addition, since the easy-to-tear sticker 18 is possibly separated from the cell main body 11, the third heating layer 182 of the easy-to-tear sticker 18 is connected in parallel with 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 after the easy-to-tear sticker 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 through hole. 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. Carry out rapid heating to battery pack assembly 1 at low temperature, controller control second switch 162 disconnection, fourth switch 164 switches on, fifth switch 165 disconnection, and first zone of heating 151 and second zone of heating 158 establish ties this moment, and heating resistor is great, and steerable first zone of heating 151 and second zone of heating 158 are to battery pack assembly 1 rapid heating, and the temperature of battery pack assembly 1 can rise fast to the temperature interval that charges fast to be convenient for battery pack 10 can rapid charging.

Referring to fig. 17, after the temperature of the electric core assembly 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 electric core assembly 1, and compared with the simultaneous heating of the first heating layer 151 and the second heating layer 158, the heating rate is relatively slow at this stage, so that the electric core assembly 1 is maintained at the fast charging temperature interval, and the battery assembly 10 can be maintained to be charged quickly.

Referring to fig. 15, as the temperature of the battery pack 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 pack 1, and thus, the temperature of the battery pack 1 can be controlled to be kept constant or slowly heated, so that the battery pack 10 can maintain rapid charging.

The size of the heating resistor can be selected by the controller through controlling the second switch 162, the fourth switch 164 and the fifth switch 165, the heating resistance value is adjusted, different heating resistance values are selected in different heating temperature intervals, different heating rates are formed, the quick charging temperature can be quickly increased by the controllable electric core assembly 1, the temperature after the quick charging temperature is reached is not increased too fast, and the quick charging temperature is maintained, so that the electric core assembly 1 has a faster charging multiplying power.

In another embodiment, the battery module 10 may be covered with a heating film, which is an ultra-thin film having a heating element built therein, and then adhered to the outer surface of the battery module 10 by adhesion. The heating element is an electric heating element. The thickness of the heating film is less than 0.1 mm. 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, that is, less than the minimum value of the quick charging temperature interval, the heating film is communicated with the external power supply or the electric core assembly 1, current is allowed 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 quick charging temperature interval and then start the normal quick charging mode.

It is to be understood that the various embodiments of the present application may be adaptively combined.

Referring to fig. 18, the present embodiment further provides a method for heating the battery assembly 10. This heating method can be applied to the battery assembly 10 according to any of the above embodiments. The heating method includes the following steps.

110: the detection temperature of the temperature sensor is acquired.

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 a heating range from a low-temperature range to a quick-charging temperature range; the second heating mode is heating from a low-temperature range to a high-magnification temperature; the third heating mode is heating from a quick charging temperature interval to a high multiplying power temperature interval. The minimum temperature value of the quick charging temperature interval is greater than the maximum temperature value of the low temperature interval; and the minimum temperature value of the high-multiplying-power temperature interval is greater than the maximum temperature value of the quick-charging temperature interval.

Specifically, the low temperature range is less than 10 ℃. The quick charging temperature range is 10-45 ℃, 10 ℃ is excluded, and 45 ℃ is included; the high-rate temperature range is 45-60 ℃, excluding 45 ℃ and including 60 ℃.

For the charging rate, the charging rate of the battery pack 1 in a low-temperature interval is smaller than the rated quick-charging rate, the charging rate of the battery pack 1 in a quick-charging temperature interval is the rated quick-charging rate, and the charging rate of the battery pack 1 in a 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 interval is detected. And if the detection result is yes, determining that the first heating mode or the second heating mode is the target heating mode.

When starting charging, if the temperature of the battery assembly 10 is less than the minimum value of the rapid charging 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 the external power supply, so that the first heating layer 151 controls the first heating layer 151 to stop heating the electric core assembly 1 or to slowly heat the electric core assembly 1 after the electric core assembly 1 is heated to a temperature increasing interval of a fast charging temperature.

In combination with the above-mentioned 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 electric core assembly 1 to the fast charging temperature range, and then controls the third heating layer 182 to heat the electric core assembly 1 alone. Or, the controller controls the first heating layer 151 and the second heating layer 158 to heat the electric core assembly 1 to a temperature rise interval of a quick charge temperature, and then controls the first heating layer 151 to heat the electric core assembly 1 alone. Or, the controller controls the first heating layer 151 and the second heating layer 158 to heat the electric core assembly 1 to a temperature rise of a rapid charging temperature range, and then controls the first heating layer 151 and the third heating layer 182 to heat the electric core assembly 1.

Optionally, the controller controls the first heating layer 151 to heat the electric core assembly 1 to a temperature range with a high magnification, and then controls the first heating layer 151 to stop heating the electric core assembly 1 or to slowly heat the electric core assembly 1.

In combination with the above-mentioned 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 electric core assembly 1 to the high-rate temperature section, and then controls the third heating layer 182 to heat the electric core assembly 1 alone. Or, the controller controls the first heating layer 151 and the second heating layer 158 to heat the electric core assembly 1 until the temperature rises to a high-rate temperature interval, and then controls the first heating layer 151 to heat the electric core assembly 1 alone. Or, the controller controls the first heating layer 151 and the second heating layer 158 to heat the electric core assembly 1 to a high-rate temperature interval after the temperature rises, and then controls the first heating layer 151 and the third heating layer 182 to heat the electric core assembly 1.

If the detection result is negative, detecting whether the detection temperature is smaller than or equal to the minimum value of the high-magnification temperature interval, and if the detection result is positive, determining that the third heating mode is the target heating mode.

When the temperature of battery assembly 10 has been located the temperature interval of filling soon, the controller control first zone of heating 151 switches on the external power supply to make first zone of heating 151 heat electric core assembly 1 to the temperature rise to higher temperature interval, then let electric core assembly 1 charge, electric core assembly 1 can charge with bigger charge rate this moment. For example, the normal quick charge of the electric core assembly 1 is 1.5C at room temperature, and a 3C quick charge mode is started after the electric core assembly is heated to 50 ℃; in this mode, the heating temperature cannot exceed the upper limit of the temperature that can be stored in the battery, for example, the temperature that can be stored in the battery is 60 ℃.

Referring to fig. 19, fig. 19 is a graph showing that the capacity of the 0.7C cell assembly 11 is 5mAh, and the charging is performed at 0.7C at 25 ℃ and 1.5C after heating to 50 ℃. As can be seen from the figure, the normal temperature full charge time is 155 min. And the multiplying power charging time after heating is shortened to 88 min. Therefore, the charging speed of the heated battery can be greatly improved.

The present application provides structural improvements to battery assembly 10 and controls battery assembly 10 into a self-heating mode by modifying the heating method described for battery assembly 10. This is done. Awaken up the inside electrochemical reaction speed of electricity core subassembly 1 when low temperature, can improve the inside electrochemical reaction speed of electricity core subassembly 1 when normal charging temperature, all can greatly improve the multiplying power that charges of electricity core subassembly 1. 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 the battery pack is charged with a corresponding charging current. On one hand, the charging rate of the battery pack 10 at low temperature can be improved, and meanwhile, the designed rated charging rate of the battery pack 10 can be broken through, so that the charging rate of the battery pack 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 various changes and modifications may be made without departing from the principles of the application, and it is intended that such changes and modifications be covered by the scope of the application.

Claims

1. A battery assembly, comprising:

the battery core assembly comprises a battery core main body, a first tab and a second tab, wherein the first tab and the second tab are electrically connected with the battery core main body; and

the packaging part, the cladding in the outer peripheral face of electricity core subassembly, the packaging part includes first zone of heating and electricity and connects first conductive terminal, the second conductive terminal of first zone of heating, first zone of heating is used for right the heating of electricity core main part, first conductive terminal is kept away from the one end of first zone of heating is used for connecting first utmost point ear, second conductive terminal is kept away from the one end of first zone of heating is used for connecting the second utmost point ear.

2. The battery assembly of claim 1, wherein the encapsulant is an aluminum plastic film and the first heating layer is an 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, wherein the first electrode terminal and the second electrode terminal are used for inputting a charging current for charging the cell assembly, inputting a heating current for the first heating layer, and outputting a discharging current for the 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, further comprising a controller for controlling 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 connected and the second switch to be disconnected in a charging mode; the controller is further configured to control the first switch and the second switch to be turned on in the heating and 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, the isolation circuit for isolating current of the electric core assembly from current of the first heating layer in the heating charging mode.

6. The battery assembly 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 turned on and the second switch to be turned off in the heating and charging mode.

7. The battery assembly of claim 4, further comprising a temperature sensor disposed in the package, wherein the temperature sensor is configured to detect a temperature of the cell main body, the temperature sensor is electrically connected to the controller, and the controller is configured to control the first heating layer to enter the heating mode according to a temperature detected by the temperature sensor.

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 substrate layer, which are sequentially stacked, and the package further comprises a second heating layer 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 basal 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 far away from the first adhesive layer; or the second heating layer is arranged on one side, deviating from the second adhesive layer, of the basal layer.

9. The battery assembly of claim 8, wherein the enclosure 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 electrically connected between the second electrode terminal and the fourth conductive terminal.

10. The battery assembly of claim 3, further comprising an easy-to-tear sticker, wherein the easy-to-tear sticker comprises a base film, a third heating layer disposed in the base film, and a third adhesive layer disposed on the surface of the base film, and the third adhesive layer is adhered to the outer surface of the package.

11. The battery assembly of claim 10, wherein the third heater layer includes a fifth electrically conductive terminal, a sixth electrically conductive terminal, and a fifth switch, one end of the fifth electrically conductive terminal being electrically connected to the first tab, the fifth switch being electrically connected between the sixth electrically conductive terminal and the second electrode end.

12. An electronic device comprising the battery pack according to any one of claims 1 to 11.

13. The heating method of the battery assembly is characterized in that the battery assembly comprises a battery assembly, an encapsulation piece, a temperature sensor and a controller, wherein the encapsulation piece is wrapped on the peripheral surface of the battery assembly and 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;

14. The method for heating a battery pack according to claim 13, wherein the determining a target heating pattern among a first heating pattern, a second heating pattern, and a third heating pattern according to the detected temperature, and controlling the first heating layer to heat in the target heating pattern includes:

detecting whether the detected temperature is smaller than or equal to the minimum value of the low-temperature interval, and if so, determining that a first heating mode or a second heating mode is a target heating mode, wherein the first heating mode is an interval from the low-temperature interval to the quick-charging temperature; the second heating mode is heating from a low-temperature range to a high-magnification temperature;

if the detection result is negative, determining that a third heating mode is a target heating mode, wherein the third heating mode is a range from the quick charging temperature range to the high-magnification temperature range; the minimum temperature value of the quick charging temperature interval is greater than the maximum temperature value of the low temperature interval; and the minimum temperature value of the high-multiplying-power temperature interval is greater than the maximum temperature value of the quick-charging temperature interval.

15. The method of heating a battery pack according to claim 13, wherein the low temperature range is less than 10 ℃ and the fast charge temperature range is 10 to 45 ℃; the high-rate temperature range is 45-60 ℃.