CN113937424B

CN113937424B - Battery cell assembly, battery assembly and electronic equipment

Info

Publication number: CN113937424B
Application number: CN202010600956.0A
Authority: CN
Inventors: 谢红斌
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Filing date: 2020-06-28
Publication date: 2024-07-09
Anticipated expiration: 2040-06-28

Abstract

The embodiment of the application provides a battery cell assembly, a battery assembly and electronic equipment, which comprise a first electrode, a second electrode and a third electrode, wherein the first electrode comprises at least one first tab; the second electrode is arranged opposite to the first electrode and comprises at least one second lug and at least one third lug, and the second lug is connected with a first conductive end of the power supply input; a separator disposed between the first electrode and the second electrode at intervals; the first switch unit is used for receiving a control signal and conducting the second conductive end of the power supply input and the third ear under the action of the control signal; or the second conductive end and the first tab are conducted under the action of the control signal. The application provides a battery cell assembly, a battery assembly and an electronic device capable of improving a charging rate.

Description

Battery cell assembly, battery assembly and electronic equipment

Technical Field

The application relates to the technical field of electronics, in particular to a battery cell assembly, a battery assembly and electronic equipment.

Background

Along with the increase of the screen and the use frequency of electronic equipment such as mobile phones, the electric quantity consumption of the electronic equipment is faster, so how to provide a battery charging rate improvement and realize the quick charging characteristic of the electronic equipment becomes the technical problem to be solved.

Disclosure of Invention

The application provides a battery cell assembly, a battery assembly and an electronic device capable of improving a charging rate.

In a first aspect, an embodiment of the present application provides a battery cell assembly, including:

the first electrode comprises at least one first tab;

The second electrode is arranged opposite to the first electrode and comprises at least one second lug and at least one third lug, and the second lug is connected with a first conductive end of the power supply input;

a separator disposed between the first electrode and the second electrode at intervals; and

The first switch unit is used for receiving a control signal and conducting the second conductive end of the power supply input and the third ear under the action of the control signal; or the second conductive end and the first tab are conducted under the action of the control signal.

In a second aspect, an embodiment of the present application provides a battery assembly, including the battery core assembly and a protection circuit, where the first tab, the second tab, and the third tab are all connected to the protection circuit.

In a third aspect, an embodiment of the present application provides an electronic device, including the battery assembly, where the battery assembly is connected to the power source through an electrical connection line; or the battery assembly is connected with the power supply in a wireless charging mode.

In a fourth aspect, an embodiment of the present application provides an electronic device, including the battery assembly, where the battery assembly is a first battery assembly, and the electronic device further includes a second battery assembly, where the second battery assembly is the power supply.

According to the battery cell assembly provided by the embodiment of the application, the electrode lug (namely the third electrode lug) is additionally arranged on the second electrode, and the first switch unit for gating the second conductive end of the first electrode lug and the power supply or the second conductive end of the third electrode lug and the power supply is arranged, so that the battery cell assembly can be switched to a self-heating mode or a charging mode, and before the battery cell assembly enters the charging mode, the battery cell assembly is controlled to be switched to the self-heating mode, so that the problem of low internal reaction speed of the battery cell assembly at low temperature (lower than the normal charging temperature of the battery cell assembly) can be effectively solved, and the charging rate can be further improved at non-low temperature; therefore, the application not only effectively solves the problem that the charging rate is low or the battery cannot be normally charged at low temperature under the conditions of extremely small structural change of the battery cell assembly and extremely small volume increase of the battery cell assembly, but also can effectively break through the rated charging multiplying power designed by the battery cell assembly and greatly improve the charging speed of the battery cell assembly.

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 a schematic diagram of a structural disassembly of the electronic device provided in FIG. 1;

fig. 3 is a block diagram of a charging circuit of a battery pack according to an embodiment of the present application;

FIG. 4 is a partially disassembled schematic illustration of a battery assembly in the electronic device provided in FIG. 2;

FIG. 5 is a cross-sectional view of the battery cell assembly of the battery assembly provided in FIG. 4 along the Z-axis direction;

FIG. 6 is a schematic view of a portion of a first cell assembly of the battery assembly provided in FIG. 4;

FIG. 7 is a schematic diagram of the structure of the power supply connected to the battery cell assembly provided in FIG. 6;

FIG. 8 is a schematic diagram of a specific structure of the battery cell assembly provided in FIG. 7 connected to a power source;

FIG. 9 is a partial circuit block diagram of the cell assembly provided in FIG. 6;

FIG. 10 is another partial circuit block diagram of the cell assembly provided in FIG. 6;

FIG. 11 is a schematic view of the cell assembly provided in FIG. 8 in a self-heating mode;

FIG. 12 is a schematic view of the cell assembly provided in FIG. 8 in a charging mode;

FIG. 13 is a further partial circuit block diagram of the cell assembly provided in FIG. 6;

FIG. 14 is a graph of a battery cell assembly provided by the present application having a capacity of 5100mAh charged at 0.7C at ambient temperature 25℃ and after heating to 50℃, at a rate of 1.5C;

FIG. 15 is a schematic view of a portion of a second cell assembly of the battery assembly provided in FIG. 4;

fig. 16 is a schematic view of a specific structure of the cell assembly provided in fig. 15;

FIG. 17 is a schematic view of the second electrode of the cell assembly provided in FIG. 15 in a self-heating mode;

fig. 18 is a schematic view of the cell assembly provided in fig. 15 in a charging mode;

FIG. 19 is a schematic view of the first electrode of the cell assembly provided in FIG. 15 in a self-heating mode;

fig. 20 is a schematic structural diagram of a first arrangement mode of a second electrode ear and a third electrode ear in a second electrode according to an embodiment of the present application;

Fig. 21 is a schematic structural diagram of a second arrangement mode of a second electrode ear and a third electrode ear in a second electrode according to an embodiment of the present application;

Fig. 22 is a schematic structural diagram of a third arrangement of a second electrode ear and a third electrode ear in a second electrode according to an embodiment of the present application;

fig. 23 is a schematic structural view of a fourth arrangement of a second electrode ear and a third electrode ear in a second electrode according to an embodiment of the present application;

FIG. 24 is a schematic view of a third cell assembly of the battery assembly provided in FIG. 4;

fig. 25 is a schematic structural view of a fourth cell assembly of the battery assembly provided in fig. 4;

FIG. 26 is a schematic view of a fifth cell assembly of the battery assembly provided in FIG. 4;

FIG. 27 is a schematic view of a sixth cell assembly of the battery assembly provided in FIG. 4;

FIG. 28 is a schematic view of a portion of a seventh cell assembly of the battery assembly provided in FIG. 4;

fig. 29 is a schematic view of the cell assembly provided in fig. 28 in a self-heating mode;

FIG. 30 is a schematic view of the cell assembly provided in FIG. 28 in a charging mode;

FIG. 31 is a schematic view of a portion of an eighth cell assembly of the battery assembly provided in FIG. 4;

FIG. 32 is a schematic view of the cell assembly provided in FIG. 31 in a self-heating mode;

FIG. 33 is a schematic view of the battery cell assembly of FIG. 31 in a charging mode;

FIG. 34 is a schematic view of a portion of a ninth cell assembly of the battery assembly provided in FIG. 4;

Fig. 35 is a schematic structural diagram of a plurality of battery cell assemblies according to an embodiment of the present application;

Fig. 36 is a schematic diagram of a wireless charging structure of a battery cell module according to an embodiment of the present application.

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 according to an embodiment of the present 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.

For convenience of description, the drawings are defined with reference to the electronic apparatus 100 being at the first viewing angle, the width direction of the electronic apparatus 100 is defined as the X direction, the length direction of the electronic apparatus 100 is defined as the Y direction, and the thickness direction of the electronic apparatus 100 is defined as the Z direction.

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 middle frame 30, and a housing 40. The middle frame 30 and the shell 40 of the display screen 20 are sequentially and fixedly connected. 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 soft pack Fang Zhuang, a cylindrical form, a prismatic form, a profile, or the like.

Referring to fig. 3, the electronic device 100 further includes a charging interface 50, a charging circuit 60, and a charging control unit 70.

Referring to fig. 2, the charging interface 50 is disposed on the middle frame 30, so that the charging interface 50 is connected to an external power source 200 (hereinafter referred to as the power source 200). Specifically, the charging interface 50 may be connected to the power supply 200 through a charging wire. The types of charging interface 50 include, but are not limited to, the Micro USB interface, the USB Type C interface, and the Lightning interface of the IOS system phone of Android and Windows phone system phones.

Referring to fig. 3, a charging circuit 60 connects the charging interface 50 and the battery assembly 10. The charging circuit 60 may be an integrated chip, and is disposed on the motherboard for controlling the charging current of the battery assembly 10. The charging interface 50 is connected to the charging circuit 60 through a flexible circuit board.

Referring to fig. 3, the charging control unit 70 is connected to the charging circuit 60. The charging interface 50, the charging circuit 60, the charging control unit 70, and the battery assembly 10 form a charging circuit of the electronic device 100.

Referring to fig. 3, the conductive terminals of the power supply 200 include a first conductive terminal 210 and a second conductive terminal 220. The first conductive terminal 210 is a positive terminal of the power supply 200, and the second conductive terminal 220 is a negative terminal of the power supply 200; or the first conductive terminal 210 is the negative terminal of the power supply 200 and the second conductive terminal 220 is the positive terminal of the power supply 200. The charging interface 50 includes a first charging terminal 501 and a second charging terminal 502. The first charging terminal 501 is connected to the first conductive terminal 210. The second charging terminal 502 is connected to the second conductive terminal 220.

In this embodiment, the first conductive terminal 210 is a negative terminal, and the second conductive terminal 220 is a positive terminal. When current flows through the second conductive terminal 220, the charging circuit 60, the positive electrode of the battery assembly 10, the negative electrode of the battery assembly 10, and the first conductive terminal 210, the battery assembly 10 charges.

In order to more clearly describe the charging process and the charging circuit, the present application is exemplified by the state in which the battery assembly 10 is connected to the positive and negative electrodes of the power source 200. The description will not be repeated later on when the tab is connected to the conductive terminal of the power supply 200.

Referring to fig. 4, in the present embodiment, a battery assembly 10 includes a battery cell assembly 1, a protection circuit 2 (also referred to as a management circuit), and a battery case 3. Of course, in other embodiments, the battery assembly 10 may not have the battery housing 3, and the protection circuit 2 may be packaged within the package case 8 of the battery cell assembly 1.

Referring to fig. 5, the battery cell assembly 1 includes a first electrode 4, a second electrode 5, an electrolyte 6, a separator 7, and a package 8. Alternatively, the first electrode 4 forms the positive electrode of the cell assembly 1 and the second electrode 5 forms the negative electrode of the cell assembly 1. Alternatively, the first electrode 4 forms the negative electrode of the cell assembly 1 and the second electrode 5 forms the positive electrode of the cell assembly 1. In this embodiment, the first electrode 4 forms the positive electrode of the cell assembly 1, and the second electrode 5 forms the negative electrode of the cell assembly 1.

Alternatively, referring to fig. 6, the first electrode 4 includes a positive current collector 41 and a positive electrode material 42 disposed on the positive current collector 41.

Alternatively, the positive electrode current collector 41 is a conductive sheet. For example, the positive electrode current collector 41 is an aluminum foil having a thickness of 10-20 μm. The positive electrode material 42 includes a layered or spinel-structured transition metal oxide or polyanion compound having a high electrode potential and a stable structure, such as lithium cobaltate, lithium manganate, lithium iron phosphate, ternary material, and the like. Positive electrode material 42 also includes carbon black and a binder. The binder may be polyvinylidene fluoride (PVDF).

Alternatively, referring to fig. 6, the first electrode 4, the separator 7 and the second electrode 5 are all sheet-shaped. The separator 7 is provided between the first electrode 4 and the second electrode 5 at a distance for preventing the first electrode 4 from directly contacting the second electrode 5. The membrane 7 is a specially formed polymer film, and the membrane 7 has a micropore structure, so that lithium ions can pass freely, but electrons cannot pass. The material of the separator 7 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 membrane 7.

Alternatively, referring to fig. 6, the second electrode 5 includes a negative electrode current collector 51 and a negative electrode material 52 disposed on the negative electrode current collector 51. The negative electrode current collector 51 is a conductive sheet. For example, the negative electrode current collector 51 is a copper foil of 10 to 20 μm. The negative electrode material 52 may be layered graphite, simple metal, and metal oxide, such as graphite, carbon fiber, graphene, lithium titanate, etc., which have a potential as close to that of lithium as possible, are structurally stable, and can store a large amount of lithium.

Alternatively, referring to fig. 5, the package case 8 is a steel case, an aluminum case, a nickel-plated iron case, an aluminum-plastic film, or the like. In this embodiment, the package 8 may be an aluminum plastic film for packaging the first electrode 4, the second electrode 5 and the diaphragm 7.

Alternatively, referring to fig. 5, the electrolyte 6 may be an organic solvent in which an electrolyte lithium salt is dissolved, to provide lithium ions, where the electrolyte lithium salt includes LiPF6, liClO4, liBF4, and the like, and the organic solvent is mainly composed of one or more of diethyl carbonate (DEC), propylene Carbonate (PC), ethylene Carbonate (EC), dimethyl ester (DMC), and the like. Electrolyte 6 is injected into the package 8, so that the first electrode 4 and the second electrode 5 are immersed in the electrolyte 6.

Li+ is inserted and extracted back and forth between the first electrode 4 and the second electrode 5 during charge and discharge of the battery assembly 10. During charging, li+ is deintercalated from the first electrode 4 (positive electrode), and is inserted into the second electrode 5 (negative electrode) through the electrolyte, and the second electrode 5 is in a lithium-rich state. The opposite is true when discharging. In other words, the first electrode 4 and the second electrode 5 can be electrically connected when both are electrically connected.

The first electrode 4 and the second electrode 5 of the cell assembly 1 are both connected to the protection circuit 2. The protection circuit 2 can monitor the voltage of the cell assembly 1 so as to regulate the charge and discharge of the cell assembly 1.

Referring to fig. 7, the battery module 1 further includes a first switch unit 31. The first electrode 4 further comprises at least one first tab 43. One end of the first tab 43 is connected to the positive electrode current collector 41. The other end of the first tab 43 is connected to the protection circuit 2 through the first switching unit 31. The first tab 43 is connected to the positive terminal of the battery through the protection circuit 2, so as to be connected to the second charging terminal 502 of the charging interface 50 through the positive terminal of the battery. In other words, the first tab 43 is connected to the second conductive terminal 220 of the power supply 200 through the first switching unit 31. The material of the first tab 43 is a conductive material, for example, the material of the first tab 43 is aluminum (Al) metal.

Referring to fig. 7, the second electrode 5 further includes at least one second ear 53 and at least one third ear 54. One end of the second tab 53 is connected to the negative electrode current collector 51. The other end of the second tab 53 can be connected to the negative terminal of the battery via the protection circuit 2 to connect to the second charging terminal 501 of the charging interface 50 via the negative terminal of the battery. In other words, the second tab 53 is used to connect to the second conductive terminal 220 of the power supply 200. The second ear 53 is made of a conductive material, for example, the second ear 53 is made of a metal forceps.

Referring to fig. 7, one end of the third tab 54 is connected to the negative current collector 51. The third lug 54 is spaced from the second lug 53. The third tab 54 is connected to the protection circuit 2 through the first switching unit 31 to be connected to the positive terminal of the battery through the protection circuit 2. In other words, the third ear 54 is connected to the second conductive terminal 220 of the power supply 200 through the first switching unit 31. The third ear 54 is made of a conductive material. For example, the third ear 54 is made of tweezer metal.

Optionally, the connection manner between the tab and the current collector includes, but is not limited to, ultrasonic welding, laser welding, riveting, conductive adhesive electrical connection, and the like.

Alternatively, the first switch unit 31 may be a single pole double throw analog switch to reduce the number of devices of the battery assembly 10, save costs and reduce the volume. Further, the first switching unit 31 and the protection circuit 2 may be disposed on the same circuit board to improve device concentration of the battery assembly 10 and to improve utilization of the circuit board.

Specifically, referring to fig. 7, the first switch unit 31 has a first end 31a, a second end 31b and a third end 31c, and the first end 31a of the first switch unit 31 is connected to the second conductive end 220 of the power source 200. The second end 31b of the first switch unit 31 is connected to the first tab 43. The third terminal 31c of the first switching unit 31 is connected to the third ear 54. The first switch unit 31 is configured to receive a control signal and conduct the second conductive terminal 220 and the third ear 54 under the action of the control signal; or the first switch unit 31 is configured to receive the control signal and conduct the second conductive terminal 220 and the first tab 43 under the action of the control signal.

When the first end 31a and the second end 31b of the first switch unit 31 are turned on, and the first end 31a and the third end 31c of the first switch unit 31 are turned off, the second conductive end 220 is connected to the first tab 43, and the second conductive end 220 is disconnected from the third tab 54, at this time, a charging path is formed between the first conductive end 210, the second tab 53, the second electrode 5, the first electrode 4, the first tab 43 and the second conductive end 220, the first electrode 4 and the second electrode 5 are electrically connected to the positive electrode and the negative electrode of the power supply 200, respectively, a potential difference is generated between the first electrode 4 and the second electrode 5, and lithium ions move between the first electrode 4 and the second electrode 5 under the action of the potential difference, so as to charge the battery assembly 10. At this time, the battery assembly 10 enters a charging mode.

When the first end 31a and the second end 31b of the first switch unit 31 are disconnected, and the first end 31a and the third end 31c of the first switch unit 31 are connected, the second conductive end 220 is disconnected from the first tab 43, and the second conductive end 220 is connected to the third tab 54, and at this time, a path is formed among the first conductive end 210, the second tab 53, the second electrode 5, the third tab 54 and the second conductive end 220. In other words, the second electrode 5 is electrically connected to both the positive and negative electrodes of the power supply 200, and the second electrode 5 generates joule heat when a current flows. At this time, the battery assembly 10 enters the self-heating mode.

In the first scenario, at a temperature lower than the normal charging temperature of the battery cell assembly 1 (for example, lower than 10 ℃), the battery cell assembly 1 is affected by a low temperature, so that the rapid charging cannot be realized due to the reduced internal reaction speed, and the normal operation of the battery is affected. Therefore, the first switch unit 31 is enabled to conduct the second conductive terminal 220 and the third tab 54 and disconnect the second conductive terminal 220 and the first tab 43, so that the second electrode 5 is electrically connected with the positive electrode and the negative electrode of the power supply 200, and the second electrode 5 generates joule heat, so that heat is generated in the battery cell, the temperature in the battery cell can be quickly increased, the reaction speed in the battery cell assembly 1 can be further increased, and the charging rate of the battery can be increased.

In the second scenario, at the normal charging temperature of the battery cell assembly 1, before charging, the first switch unit 31 is enabled to conduct the second conductive terminal 220 and the third tab 54 and disconnect the second conductive terminal 220 and the first tab 43, so that the second electrode 5 is electrically connected with the positive electrode and the negative electrode of the power supply 200, and thus, heat is generated inside the battery cell, and the charging rate can be effectively improved. For example, the battery cell is charged at a charge rate of 1.5C (C is used to represent the charge and discharge capacity rate of the battery), and after heating to 50 ℃, the battery cell starts to charge at a charge rate of 3C in the fast charge mode.

In other words, when the charging circuit 60 receives the charging command, the battery module 1 is controlled to enter the self-heating mode before the battery module 1 enters the charging stage, so that the reaction speed inside the battery module 1 is awakened at low temperature, the reaction speed inside the battery module 1 can be increased at normal charging temperature, and the charging rate of the battery module 1 can be greatly increased.

According to the battery cell assembly 1 provided by the embodiment of the application, the third lug 54 is additionally arranged on the second electrode 5, and the first switch unit 31 is arranged to gate the first lug 43 and the second conductive end 220 of the power supply 200 or the third lug 54 and the second conductive end 220 of the external power supply 200, so that the battery cell assembly 1 can be switched to a self-heating mode or a charging mode, and before the battery cell assembly 1 enters the charging mode, the battery cell assembly 1 is controlled to enter the self-heating mode, so that the problem of low internal reaction speed of the battery cell assembly 1 at low temperature (lower than the normal charging temperature of the battery cell assembly 1) can be effectively solved, and the charging rate can be further improved at non-low temperature; therefore, the application not only effectively solves the problem that the charging rate is low or the battery cannot be normally charged at low temperature under the conditions of extremely small structural change of the battery cell assembly 1 and extremely small volume increase of the battery cell assembly 1, but also can effectively break through the rated charging multiplying power designed by the battery cell assembly 1 and greatly improve the charging speed of the battery cell assembly 1.

Referring to fig. 8, the first switching unit 31 may include a first switch 311 and a second switch 312. One end of the first switch 311 is used to connect to the second conductive terminal 220. The other end of the first switch 311 is connected to the first tab 43. Alternatively, the first switch 311 may be a triode switch or a field effect transistor switch.

Referring to fig. 8, one end of the second switch 312 is used for connecting to the second conductive terminal 220. The other end of the second switch 312 is connected to the third ear 54. Alternatively, the second switch 312 may be a triode switch or a field effect transistor switch. Optionally, the first switch 311, the second switch 312 and the protection circuit 2 are disposed on the same circuit board, so that the devices are disposed in a centralized manner.

By mutually independent the first switch 311 and the second switch 312, the conduction between the first tab 43 and the second conductive terminal 220 and the conduction between the third tab 54 and the second conductive terminal 220 are respectively controlled, so that the gating accuracy is improved, and the gating error is reduced.

Referring to fig. 9, the battery module 1 further includes a control unit 9. The control unit 9 and the protection circuit 2 can be arranged on the same circuit board, so that the devices of the battery cell assembly 1 are arranged in a concentrated manner, the device forming is convenient, and the space is saved. The control unit 9 is an integrated chip. The control unit 9 is arranged to generate control signals. The control signals include a first control signal and a second control signal. The control unit 9 connects the first switch 311 and the second switch 312. The first control signal is used for controlling the first switch 311 to be turned off and the second switch 312 to be turned on, and the battery cell assembly 1 enters the self-heating mode. The second control signal is used for controlling the first switch 311 to be turned on and the second switch 312 to be turned off, and the battery module 1 enters the charging mode.

For example, the second switch 312 and the first switch 311 are transistors. The first switch 311 and the second switch 312 are different in type. For example, the first switch 311 is an N-type transistor, and the second switch 312 is a P-type transistor. Or the first switch 311 is a P-type triode and the second switch 312 is an N-type triode. In this embodiment, the first switch 311 is an N-type transistor, and the second switch 312 is a P-type transistor. The first switch 311 includes an emitter, a base, and a collector. The base of the first switch 311 is connected to the control unit 9, the emitter of the first switch 311 is connected to the second conductive terminal 220, and the collector of the first switch 311 is connected to the first tab 43. The second switch 312 includes an emitter, a base, and a collector. The base of the second switch 312 is connected to the control unit 9, the collector of the second switch 312 is connected to the second conductive terminal 220, and the emitter of the second switch 312 is connected to the third ear 54.

When the control unit 9 receives the charging command, the control unit 9 generates a first control signal and sends the first control signal to the base of the second switch 312 and the base of the first switch 311, the first control signal is a high level signal, the high level signal turns off the emitter and collector of the first switch 311, and the emitter and collector of the second switch 312 are turned on, at this time, the battery assembly 10 enters the self-heating mode. The charge command is a signal generated by the battery assembly 10 when it is connected to the conductive terminal of the power supply 200.

When the control unit 9 receives the heating stop instruction, the control unit 9 generates a second control signal and transmits the second control signal to the base of the second switch 312 and the base of the first switch 311, the second control signal is a low level signal, the low level signal disconnects the emitter and collector of the second switch 312, and the emitter and collector of the first switch 311 are turned on, at which time the battery assembly 10 enters the charging mode.

Referring to fig. 10, the battery cell assembly 1 further includes a temperature sensor 11. The temperature sensor 11 is connected to the control unit 9. Optionally, the temperature sensor 11 is disposed on the motherboard and is close to the location of the battery cell assembly 1. The temperature sensor 11 is configured to detect a temperature of the battery cell assembly 1, and send a heating signal to the control unit 9 when the temperature of the battery cell assembly 1 is less than or equal to a first preset temperature. The control unit 9 controls the first switch 311 to be turned off and the second switch 312 to be turned on according to the heating signal.

The first preset temperature is a low temperature critical temperature affecting the charging rate of the battery cell assembly 1. Generally, when the environmental temperature is too low, the capacity of the battery cell assembly 1 is reduced, the voltage is reduced, and particularly lithium ions are easily deposited on the negative electrode during the continuous charging process to form a polarization voltage, so that the battery cell assembly 1 loses electrical activity, and the electric quantity of the battery cell assembly 1 charged into the battery cell assembly 1 in the low-temperature environment is reduced. Optionally, the first preset temperature is 10 ℃ to 12 ℃. For example, the first preset temperature is 10 ℃.

Referring to fig. 11, when the temperature sensor 11 detects that the temperature of the battery cell assembly 1 is less than or equal to 10 ℃, the temperature sensor 11 sends a heating signal to the control unit 9. The control unit 9 controls the first switch 311 to be turned off and the second switch 312 to be turned on according to the heating signal, so that the battery cell assembly 1 enters a self-heating mode, and the temperature of the battery cell assembly 1 is further raised.

Referring to fig. 12, the temperature sensor 11 is further configured to send a heating stop signal to the control unit 9 when the temperature of the battery cell assembly 1 is greater than or equal to a second preset temperature. The second preset temperature is greater than the first preset temperature. The control unit 9 is configured to control the first switch 311 to be turned off and the second switch 312 to be turned off according to the heating stop signal, so as to stop the second electrode 5 from generating heat. Or the control unit 9 controls the first switch 311 to be turned on and the second switch 312 to be turned off according to the heating stop signal, so that the battery cell assembly 1 starts to be charged.

The second preset temperature is a high temperature critical temperature affecting the charging performance of the battery cell assembly 1. The high-temperature critical temperature is 55-80 ℃. For example, the high temperature critical temperature is 60 ℃. When the temperature sensor 11 detects that the temperature of the battery cell assembly 1 is greater than or equal to 60 ℃, the temperature sensor 11 sends a stop heating signal to the control unit 9. The control unit 9 controls the first switch 311 to be turned off and the second switch 312 to be turned off according to the heating stop signal, so that the battery cell assembly 1 enters the heating stop mode. Or the control unit 9 controls the first switch 311 to be turned on and the second switch 312 to be turned off according to the heating stop signal, so that the battery cell assembly 1 enters a charging mode. In this embodiment, the temperature of the battery cell assembly 1 is raised to 60 ℃ before the charging mode, so that the problem of low charging efficiency at low temperature is effectively solved, and the charging rate of the battery cell assembly 1 can be higher.

Of course, in other embodiments, the temperature sensor 11 may stop the heating signal to the control unit 9 when the detected temperature rises to the third preset temperature. The third preset temperature is greater than the first preset temperature, and the third preset temperature is less than the second preset temperature. That is, when the current temperature of the battery cell assembly 1 is less than or equal to the normal charging temperature, the second electrode 5 is self-heated to within the normal charging temperature range, so that the control unit 9 can send a heating stop signal.

When the temperature sensor 11 detects that the temperature of the battery cell assembly 1 is at a lower temperature, that is, the temperature of the battery cell assembly 1 is lower than the normal fast charging temperature, the second switch 312 is turned on first, current is led to pass through the whole second electrode 5, the current loop generates heat to enable the temperature of the battery cell assembly 1 to rise to the normal fast charging range, and then the second switch 312 is turned off and the first switch 311 is turned on, so that the normal charging mode (or the fast charging mode) is started.

Referring to fig. 13, the battery module 1 further includes a charging detection unit 12. Alternatively, the charging detection unit 12 may be disposed on the same circuit board as the protection circuit 2, and the charging detection unit 12 may also be disposed on the motherboard.

The charge detection unit 12 is connected to the control unit 9. The charging detection unit 12 is configured to detect an on state of the battery cell assembly 1 and the power supply 200, and send a heating signal to the control unit 9 when the battery cell assembly 1 is turned on with the power supply 200. The control unit 9 controls the first switch 311 to be turned off and the second switch 312 to be turned on according to the heating signal, so that the battery cell assembly 1 enters the self-heating mode.

In other words, when the battery cell assembly 1 is powered on to the power supply 200, the charging detection unit 12 detects that the battery cell assembly 1 is shifted from the non-powered on state to the powered on state, the charging detection unit 12 sends a heating signal to the control unit 9, and the control unit 9 controls the battery cell assembly 1 to enter the self-heating mode.

Thus, when the battery cell assembly 1 is already in the normal charging temperature interval (or the fast charging temperature interval), the second switch 312 is turned on first, so that the current loop heats the battery cell assembly 1 to raise the temperature of the battery cell assembly 1 to a higher temperature interval, and then the first switch 311 is turned on and the second switch 312 is turned off, so as to turn on a larger charging rate, for example, the normal fast charging rate of the battery cell assembly 1 is 1.5C at room temperature, and the fast charging mode with the fast charging rate of 3C is started after the battery cell assembly 1 is heated to 50 ℃.

Referring to fig. 14, fig. 14 is a graph showing a capacity 5100mAh of a 0.7C cell assembly 1 charged at 0.7C at normal temperature 25℃ and charged at 1.5C rate after heating to 50℃. From the graph, the normal temperature full charge time is 155min, and the charging time of the lifting multiplying power after heating is shortened to 88min, so that the charging speed of the battery after heating can be greatly improved.

In the case where the cell assembly 1 starts self-heating from the normal charge temperature interval, the temperature sensor 11 transmits a stop heating signal to the control unit 9 when the detected temperature thereof is greater than or equal to the second preset temperature. The control unit 9 controls the first switch 311 to be turned off and the second switch 312 to be turned off according to the heating stop signal, so that the heating of the battery cell assembly 1 is stopped. Or the control unit 9 controls the first switch 311 to be turned on and the second switch 312 to be turned off according to the heating stop signal, so that the battery cell assembly 1 enters a charging mode. This process is described in detail above.

Referring to fig. 15, the first electrode 4 further includes at least one fourth electrode tab 44. In the present embodiment, the first electrode 4 forms the positive electrode of the battery assembly 10, and the second electrode 5 forms the negative electrode of the battery assembly 10. The fourth tab 44 is spaced apart from the first tab 43. The fourth tab 44 is connected to the positive current collector 41 by, but not limited to, soldering, electrical connection with conductive paste, and the like. The fourth tab 44 is made of the same material as the first tab 43.

Referring to fig. 15, the battery module 1 further includes a second switch unit 32. One end of the second switching unit 32 is used to connect the first conductive terminal 210. The other two ends of the second switch unit 32 are respectively connected with the second lug 53 and the fourth lug 44. The second switch unit 32 is configured to receive the control signal and conduct the first conductive terminal 210 and the second tab 53 under the action of the control signal; or the second switch unit 32 is configured to receive the control signal and conduct the first conductive terminal 210 and the fourth electrode 44 under the action of the control signal.

Referring to fig. 15, one end of the second switch unit 32 is connected to the protection circuit 2. The second switch unit 32 is connected to the first charging terminal 501 of the charging interface 50 via the protection circuit 2, and is used for connecting to the first conductive terminal 210 of the power supply 200. Further, the second switch unit 32 and the protection circuit 2 may be disposed on the same circuit board, so as to improve the device concentration of the battery cell assembly 1 and improve the utilization rate of the circuit board.

Referring to fig. 15, the other two ends of the second switch unit 32 are respectively connected to the second pole ear 53 and the fourth pole ear 44. The second switch unit 32 is configured to receive the control signal and conduct the first conductive terminal 210 and the second tab 53 or conduct the first conductive terminal 210 and the fourth tab 44 under the action of the control signal. Alternatively, the second switch unit 32 may be a single pole double throw analog switch, so as to reduce the number of devices of the battery cell assembly 1, save cost and reduce volume.

Referring to fig. 16, the second switching unit 32 includes a third switch 321 and a fourth switch 322. One end of the third switch 321 and one end of the fourth switch 322 are both used for connecting the first conductive terminal 210. The other end of the third switch 321 is connected to the second tab 53. The other of the fourth switch 322 is connected to the fourth pole 44. Alternatively, the third switch 321 may be a triode switch or a field effect transistor switch. Alternatively, the fourth switch 322 may be a triode switch or a field effect transistor switch. Optionally, the third switch 321, the fourth switch 322 and the protection circuit 2 are disposed on the same circuit board, so that the devices are disposed in a centralized manner.

By mutually independent third switch 321 and fourth switch 322, conduction between second tab 53 and first conductive terminal 210 and conduction between fourth tab 44 and first conductive terminal 210 are controlled, gating accuracy is improved, and gating error is reduced.

The third switch 321 and the fourth switch 322 are both connected to the control unit 9. The control signals further include a third control signal and a fourth control signal.

Referring to fig. 17, the third control signal is used for controlling the third switch 321 to be turned on and the fourth switch 322 to be turned off, so that the first conductive terminal 210 is connected to the second tab 53; the control unit 9 sends a first control signal to the first switch 311 and the second switch 312 to turn off the first switch 311 and turn on the second switch 312, and at this time, the second electrode 5 enters a self-heating mode; or referring to fig. 18, the control unit 9 sends a second control signal to the first switch 311 and the second switch 312 to turn on the first switch 311 and turn off the second switch 312, so that the battery module 1 enters the charging mode.

Referring to fig. 19, the fourth control signal is used for controlling the third switch 321 to be turned off and the fourth switch 322 to be turned on, so that the first conductive terminal 210 is connected to the fourth electrode 44; the control unit 9 sends a second control signal to the first switch 311 and the second switch 312 to turn off the second switch 312 and turn on the first switch 311, so that the first electrode 4 enters the self-heating mode.

Optionally, the third switch 321 and the fourth switch 322 are all transistors. The connection manner of the third switch 321 and the first conductive terminal 210, the control unit 9, and the second tab 53 may refer to the connection manner of the first switch 311 and the second conductive terminal 220, the control unit 9, and the first tab 43, which are not described herein. Similarly, the connection manner between the fourth switch 322 and the first conductive terminal 210, the control unit 9, and the fourth tab 44 may refer to the connection manner between the first switch 311 and the second conductive terminal 220, the control unit 9, and the first tab 43, which are not described herein.

According to the embodiment of the application, the electrode lugs and the switches are additionally arranged, so that the first electrode 4 and the second electrode 5 can be independently self-heated. Wherein controlling self-heating of the first electrode 4, the second electrode 5 includes, but is not limited to, the following embodiments.

Referring to fig. 17, in the first heating stage, the control unit 9 controls the first switch 311 to be turned off, the second switch 312 to be turned on, the third switch 321 to be turned on, and the fourth switch 322 to be turned off, and the second electrode 5 is self-heated.

Referring to fig. 19, in the second heating stage, the control unit 9 controls the first switch 311 to be turned on, the second switch 312 to be turned off, the third switch 321 to be turned off, and the fourth switch 322 to be turned on, and then the first electrode 4 is self-heated. There is a time interval between the first heating stage and the second heating stage. Further, the self-heating of the first electrode 4 and the second electrode 5 may be alternately controlled.

In other words, the self-heating of the first electrode 4 and the second electrode 5 is controlled in a time-sharing manner, so that on one hand, the heating uniformity of the battery cell assembly 1 can be improved; on the other hand, the first electrode 4 and the second electrode 5 can be used in a frequency balance mode, and the stability of the battery is improved.

The specific structures of the first electrode 4 and the second electrode 5 are not specifically limited, and the structures of the first electrode 4 and the second electrode 5 are described by way of example below, but of course, the structures of the first electrode 4 and the second electrode 5 provided by the present application include but are not limited to the following embodiments.

Alternatively, referring to fig. 20, the second electrode 5 is substantially rectangular. The second electrode 5 includes two long sides 5a, 5b disposed opposite to each other and two short sides 5c, 5d connected between the two long sides 5a, 5 b. The length of each long side is greater than or equal to the length of each short side.

In a first possible embodiment, referring to fig. 20, the second tab 53 and the third tab 54 are located at two short sides 5c, 5d, respectively. Further, the second tab 53 and the third tab 54 are disposed substantially diagonally, so that a conductive path between the second tab 53 and the third tab 54 can be increased, and further, an internal resistance value of the current passing through the second electrode 5 is increased, and further, a heating value of the second electrode 5 is increased, and a heating efficiency of the battery cell assembly 1 is improved.

In a second possible embodiment, referring to fig. 21, the second tab 53 and the third tab 54 are respectively disposed on two long sides 5a, 5b. Further, the second tab 53 and the third tab 54 are disposed substantially diagonally, similar to the previous embodiment, so that the conductive path between the second tab 53 and the third tab 54 can be increased, and the internal resistance of the current passing through the second electrode 5 can be further improved, and the heat productivity of the second electrode 5 can be further increased, and the heating efficiency of the battery cell assembly 1 can be improved.

In a third possible embodiment, referring to fig. 22, the second and third ears 53, 54 are located on one long side 5a and are adjacent to two short sides 5c, 5d, respectively.

In this embodiment, the second tab 53 and the third tab 54 are provided on the same side as the above two embodiments, and thus, the lead wire connected to the second tab 53 and the lead wire connected to the third tab 54 can be led out from the long side 5a, so as to avoid the lead wire disorder. Meanwhile, the second lug 53 and the third lug 54 are respectively close to the two short sides 5c and 5d, so that the conductive path between the second lug 53 and the third lug 54 can be effectively increased, the heating value of the second electrode 5 is further increased, and the heating efficiency of the battery cell assembly 1 is improved.

In a fourth possible embodiment, referring to fig. 23, the second and third ears 53, 54 are located on one short side 5c and near both long sides 5a, 5b, respectively.

Similar to the third embodiment, the second tab 53 and the third tab 54 are disposed on the same side, and thus, the lead wire connected to the second tab 53 and the lead wire connected to the third tab 54 can be led out from the short side 5c, so as to avoid the lead wire disorder. Meanwhile, the second lug 53 and the third lug 54 are respectively close to the two long sides 5a and 5b, so that the conductive path between the second lug 53 and the third lug 54 can be effectively increased, the heating value of the second electrode 5 is further increased, and the heating efficiency of the battery cell assembly 1 is improved.

The above embodiment in which the second tab 53 and the third tab 54 are disposed on the second electrode 5, and the embodiment in which the first tab 43 and the fourth tab 44 are disposed on the first electrode 4 can refer to the above embodiment, and will not be described herein.

The embodiment of the present application does not specifically describe the structural form of the battery cell assembly 1, and the battery cell assembly 1 provided by the present application includes, but is not limited to, the following embodiments.

In one possible implementation, referring to fig. 24, the present embodiment provides a coiled cell structure. The cell assembly 1 further comprises a separator 7 laminated between the first electrode 4 and the second electrode 5. The first electrode 4, the separator 7 and the second electrode 5 are wound together to form the cell assembly 1. The long side 5a of the second electrode 5 is a wound side. The second and third ears 53, 54 are located on one long side 5a and are close to the two short sides 5c, 5d, respectively. Further, the second tab 53 and the third tab 54 may be proximate to the seal of the enclosure 8. In this way, the second tab 53 and the third tab 54 can be connected to the protection circuit 2 by a shorter electrical connection wire, reducing the line length inside the cell assembly 1.

In another possible implementation, the present embodiment provides a laminated cell structure. Referring to fig. 25, the first electrode 4 includes a plurality of first sub-electrode tabs 45 and a plurality of first sub-tabs 46. The plurality of first sub-electrode pads 45 are stacked on each other and disposed at intervals. Each first sub-tab 46 is connected to one first sub-electrode tab 45. The plurality of first sub-tabs 46 are connected in parallel to form a first tab 43.

Referring to fig. 25, the second electrode 5 includes a plurality of second sub-electrode pads 55, a plurality of second sub-tabs 56, and at least one third sub-tab 57. Each second sub-electrode tab 55 is disposed between two adjacent first sub-electrode tabs 45. The cell assembly 1 further comprises a plurality of diaphragms 7, one diaphragm 7 being arranged between each adjacent first sub-electrode tab 45 and second sub-electrode tab 55. Each second sub-tab 56 is connected to one second sub-electrode tab 55. The plurality of second sub-tabs 56 are connected in parallel to form a second tab 53. Each third sub-tab 57 is connected to one second sub-electrode tab 55. At least one third sub-tab 57 forms a third tab 54. The third sub-tab 57 is spaced apart from the second sub-tab 56.

Alternatively, referring to fig. 25, the number of the third sub-tabs 57 is plural. The third sub-tabs 57 are connected in parallel to form a third tab 54. In the above embodiment, the third ear 54 is connected to the second conductive terminal 220 through the second switch 312, and the second ear 53 is connected to the first conductive terminal 210 through the third switch 321. The first tab 43 is connected to the second conductive terminal 220 through the first switch 311. When the control unit 9 controls the first switch 311 to be turned on, the second switch 312 to be turned off, the third switch 321 to be turned off, and the fourth switch 322 to be turned on, the plurality of second sub-electrode tabs 55 provided with the third sub-tab 57 generate heat after being turned on, so as to increase the temperature of the battery cell assembly 1.

Alternatively, referring to fig. 26, the number of the third sub-tabs 57 is one. A third sub-tab 57 forms the third tab 54. Further, the third sub-tab 57 is provided on any one of the plurality of second sub-electrode tabs 55. In other words, one second sub-electrode tab 55 in the second electrode 5 is provided with a second sub-tab 56 and a third sub-tab 57. The control unit 9 controls the first switch 311 to be turned on, the second switch 312 to be turned off, the third switch 321 to be turned off, and the fourth switch 322 to be turned on, and the second sub-electrode sheet 55 provided with the third sub-electrode tab 57 is in current flow, and the second sub-electrode sheet 55 generates heat, and compared with the plurality of second sub-electrode sheets 55 generating heat, the second sub-electrode sheet 55 provided in the embodiment generates heat in a single sheet, the internal resistance of a single sub-electrode sheet is larger than the internal resistance of sub-electrode sheets connected with the plurality of second sub-electrode sheets 55 in parallel, so that the heat generation amount of the single sub-electrode sheet is larger than the heat generation amount of sub-electrode sheets connected with the plurality of second sub-electrode sheets 55 in parallel, and further faster temperature rise is realized.

Alternatively, referring to fig. 27, the number of the third sub-tabs 57 is plural. The second switch 312 includes a plurality of sub-switches 313. Each sub-switch 313 is connected to one of the third sub-tabs 57 and the second conductive terminal 220. The sub-switch 313 is used for receiving a control signal and is turned on or off under the action of the control signal. By controlling the on/off of the plurality of sub-switches 313, the number of the second sub-electrode pads 55 connected between the first conductive terminal 210 and the second conductive terminal 220 during the self-heating of the second electrode 5 can be controlled, thereby controlling the internal resistance of the self-heating of the second electrode 5 and adjusting the temperature rising rate of the self-heating of the second electrode 5.

Alternatively, referring to fig. 28, the plurality of second sub-electrode pads 55 include a first electrode unit 551 and a second electrode unit 552 disposed adjacently. Specifically, the first electrode unit 551 and the second electrode unit 552 are two adjacent second sub-electrode pads 55, respectively.

Referring to fig. 28, the plurality of second sub-tabs 56 includes a first tab unit 561 and a second tab unit 562. The first tab unit 561 is connected to the first electrode unit 551. The second electrode unit 552 is connected to the second electrode unit 562. The at least one third sub-tab 57 includes a third tab unit 571 connected to the first electrode unit 551.

Referring to fig. 28, the battery module 1 further includes at least one fifth switch 33, at least one sixth switch 34, and at least one seventh switch 35.

Referring to fig. 28, two ends of the fifth switch 33 are respectively connected to the first tab unit 561 and the second tab unit 562. The fifth switch 33 is used for controlling the on-off between the first tab unit 561 and the second tab unit 562.

Referring to fig. 28, two ends of the sixth switch 34 are respectively connected to one end of the first electrode unit 551 away from the first tab unit 561 and one end of the second electrode unit 552 away from the second tab unit 562. The sixth switch 34 is used for controlling the on-off of the first electrode unit 551 and the second electrode unit 552.

Referring to fig. 28, two ends of the seventh switch 35 are respectively connected to the third ear unit 571 and the second conductive end 220. The seventh switch 35 is used for controlling the on/off of the third ear unit 571 and the second conductive terminal 220.

The fifth switch 33, the sixth switch 34 and the seventh switch 35 are all connected to the control unit 9.

Referring to fig. 29, the control signal can be used to control the fifth switch 33 to be turned off, the sixth switch 34 to be turned on, and the seventh switch 35 to be turned on, so that the third ear unit 571, the first electrode unit 551, the second electrode unit 552, and the second ear unit 562 are sequentially connected in series. Because the third ear unit 571 is connected to the second conductive end 220, the second ear unit 562 is connected to the first conductive end 210, and the first electrode unit 551 and the second electrode unit 552 are connected between the positive electrode and the negative electrode of the power source 200, so that the first electrode unit 551 and the second electrode unit 552 generate heat in series, compared with one electrode unit or a plurality of parallel electrode units, the internal resistance of the two electrode units provided in this embodiment is higher, the self-heating efficiency is higher, and the temperature rise is faster.

Also, by providing both ends of the sixth switch 34 to connect the end of the first electrode unit 551 remote from the first tab unit 561 and the end of the second electrode unit 552 remote from the second tab unit 562, respectively, the internal resistance to heat generation of the first electrode unit 551 and the second electrode unit 552 can be made larger.

Referring to fig. 30, the control signal may also be used to control the fifth switch 33 to be turned on, the sixth switch 34 to be turned off, and the seventh switch 35 to be turned off, so that the first tab unit 561 is connected to the first electrode unit 551, and the second tab unit 562 is connected to the second electrode unit 552. The first tab unit 561 is connected to the second tab unit 562. The first tab unit 561 and the second tab unit 562 are connected in parallel and then connected to the first conductive terminal 210, so as to realize that the second electrode 5 is connected to the first conductive terminal 210 through the second tab 53. And the first tab 43 combined with the first electrode 4 is connected with the second conductive end 220, so that the charging of the battery cell assembly 1 is realized.

Further, referring to fig. 31, the first electrode unit 551, the second electrode unit 552, the first tab unit 561, the second tab unit 562, the third tab unit 571, the fifth switch 33, the sixth switch 34, and the seventh switch 35 are loop units of one second electrode 5. The cell assembly 1 comprises a plurality of the above-described loop units. The cell assembly 1 comprises at least a first loop unit 111 and a second loop unit 112 arranged adjacently. The second tab unit 562 of the first loop unit 111 is connected to the first tab unit 561 of the second loop unit 112. One end of the seventh switch 35 of the first loop unit 111 and one end of the seventh switch 35 of the second loop unit 112 are connected to the second conductive terminal 220.

Referring to fig. 32, when the control signal controls the fifth switch 33 to be turned off, the sixth switch 34 to be turned on, the seventh switch 35 to be turned on, the fifth switch 33 to be turned off, the sixth switch 34 to be turned on, and the seventh switch 35 to be turned off in the first loop unit 111, the first electrode unit 551 in the first loop unit 111, the second electrode unit 552 in the first loop unit 111, the first electrode unit 551 in the second loop unit 112, and the second electrode unit 552 in the second loop unit 112 to be sequentially connected in series, thereby forming a heating internal resistance in which the four electrode units are mutually connected in series, and further improving the temperature raising efficiency of the battery cell assembly 1.

Further, the number of the loop units in the second electrode 5 is not limited, so that more electrode units can be connected in series, so that the heating internal resistance is increased, and the temperature raising efficiency of the battery cell assembly 1 is further improved.

Referring to fig. 33, when the control signal controls the fifth switch 33 to be turned on, the sixth switch 34 to be turned off, the seventh switch 35 to be turned off, the fifth switch 33 to be turned on, the sixth switch 34 to be turned off, and the seventh switch 35 to be turned off in the first loop unit 111, the first tab unit 561 in the first loop unit 111, the second tab unit 562 in the first loop unit 111, the first tab unit 561 in the second loop unit 112, and the second tab unit 562 in the second loop unit 112 are connected in parallel to form the second tab 53 for the charging application of the plurality of second electrodes 5.

The above structural improvement of the second electrode 5 may refer to the structural improvement of the first electrode 4, and will not be described herein.

Referring to fig. 34, the cell assembly 1 further includes a heating element 13. The heating element 13 is connected between the third ear 54 and the first switching unit 31. The heating element 13 may be a material with good heating effect in the energized state, such as a metal heating wire, graphene, a positive temperature coefficient thermistor (positive temperature coefficient, PTC), etc.

By additionally arranging the heating element 13, when the control unit 9 controls the second electrode 5 to self-heat, the heating element 13 is electrified, so that the heating element 13 and the second electrode 5 can generate heat in series, the heating rate of the battery cell assembly 1 is further improved, and the time for fully charging the battery is shortened.

Alternatively, the number of the battery modules 1 in the electronic device 100 provided by the present application may be one or more. When the number of the battery cell assemblies 1 is plural, the electronic device 100 may include a first battery cell assembly 1 and a second battery cell assembly 1, and the first battery cell assembly 1 and the second battery cell assembly 1 may be mutually charged or independently charged from the external power source 200.

The charging manner of the battery cell assembly 1 provided in the embodiment of the present application includes, but is not limited to, the following embodiments.

In a first alternative embodiment, referring to fig. 35, an electronic device 100 includes a first battery cell assembly 101 and a second battery cell assembly 102. The positive electrode tab of the first cell assembly 101 is connected with the positive electrode tab of the second cell assembly 102 through a switch. The negative electrode tab of the first cell assembly 101 is connected with the negative electrode tab of the second cell assembly 102 through a switch. The first and second cell assemblies 101 and 102 may operate simultaneously or in a time-sharing manner. Wherein, when the temperature of the first cell assembly 101 is too low, the second cell assembly 102 may charge the first cell assembly 101. Likewise, the first cell assembly 101 may charge the second cell assembly 102 when the temperature of the second cell assembly 102 is too low. In this way, the temperature of the first battery cell assembly 101 and the temperature of the second battery cell assembly 102 can be increased, and the temperatures of the first battery cell assembly 101 and the second battery cell assembly 102 are increased to be higher than the normal charging temperature, so that the problem that the electronic device 100 cannot be charged normally at a temperature lower than the normal charging temperature is effectively solved.

It will be appreciated that any of the above description of the structure of the battery cell assembly 1 may be incorporated into this embodiment, where the positive electrode of the second battery cell assembly 102 corresponds to the second conductive terminal 220 of the power supply 200 in the above embodiment and the negative electrode of the second battery cell assembly 102 corresponds to the first conductive terminal 210 of the power supply 200 in the above embodiment when the first battery cell assembly 101 needs to be charged, so that the second battery cell assembly 102 charges the first battery cell assembly 101.

Of course, the number of the cell assemblies 1 is not particularly limited in this embodiment.

In this embodiment, by providing the plurality of battery cell assemblies 1 and enabling the plurality of battery cell assemblies 1 to be mutually chargeable, the battery cell assemblies 1 can be charged without an external power supply 200, and the discharge performance of the battery cell assemblies 1 at low temperature is improved.

In a second alternative embodiment, the battery module 1 may be electrically connected to the external power source 200 through an electrical connection wire. This embodiment is referred to the above detailed description in describing the cell assembly 1, and will not be described here.

In a third alternative embodiment, referring to fig. 36, the battery module 1 may be further charged by an external wireless charger through a wireless charging manner.

In particular, the electronic device 100 may include a wireless charging coil 14. The above description of any one of the embodiments of the structure of the battery module 1 may be incorporated into the present embodiment, wherein the first end of the wireless charging coil 14 may correspond to the first conductive end 210 of the power supply 200 in the above embodiment, and the other end of the wireless charging coil 14 may correspond to the second conductive end 220 of the power supply 200 in the above embodiment, thus achieving charging of the battery module 1.

The embodiment of the present application is described by taking a manner that the battery cell assembly 1 is electrically connected to the external power supply 200 through an electrical connection wire as an example, and those skilled in the art can apply the inventive concept of the present application to an application scenario that the battery cell assembly 1 is charged by wireless or the battery cell assemblies 1 are mutually charged.

The connection between the circuit and the electronic device and the connection between the electronic device and the electronic device in the application can be conducted when the power is on, namely, the connection relationship is electrical connection. The circuit comprises a charging circuit, a protection circuit and the like. The electronic device includes a charging interface 50, a battery assembly 10, a charging terminal, an electrode, a current collector, a positive electrode material, a negative electrode material, a switching unit, a switch, and the like.

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

1. A cell assembly, comprising:

the first electrode comprises at least one first tab;

The first switch unit is provided with a first end, a second end and a third end, wherein the first end is connected with a second conductive end of a power supply, the second end is connected with the first electrode lug, the third end is connected with the third electrode lug, the first switch unit is used for receiving a control signal and conducting the second conductive end and the third electrode lug which are input by the power supply under the action of the control signal, and the battery cell assembly is switched into a self-heating mode; or the battery cell component is used for receiving a control signal, conducting the second conductive end and the first tab under the action of the control signal, and switching the battery cell component into a charging mode; the first switch unit is used for controlling the battery cell assembly to switch to the self-heating mode before entering the charging mode when the temperature of the battery cell assembly is smaller than or equal to a first preset temperature.

2. The cell assembly of claim 1, wherein the first switch unit comprises a first switch and a second switch, one end of the first switch being connected to the second conductive terminal, the other end of the first switch being connected to the first tab; one end of the second switch is connected with the second conductive end, and the other end of the second switch is connected with the third ear.

3. The cell assembly of claim 2, further comprising a control unit connecting the first switch and the second switch, the control unit for generating the control signal; the control signals comprise a first control signal and a second control signal; the first control signal is used for controlling the first switch to be switched off and the second switch to be switched on; the second control signal is used for controlling the first switch to be conducted and the second switch to be disconnected.

4. The battery cell assembly according to claim 3, further comprising a temperature sensor connected to the control unit, wherein the temperature sensor is configured to detect a temperature of the battery cell assembly and send a heating signal to the control unit when the temperature of the battery cell assembly is less than or equal to a first preset temperature, and the control unit controls the first switch to be turned off and the second switch to be turned on according to the heating signal; the temperature sensor is further used for sending a heating stopping signal to the control unit when the temperature of the battery cell assembly is greater than or equal to a second preset temperature, the second preset temperature is greater than the first preset temperature, and the control unit is used for controlling the first switch to be turned off and the second switch to be turned off according to the heating stopping signal; or the control unit controls the first switch to be switched on and the second switch to be switched off according to the heating stop signal.

5. The battery cell assembly of claim 3, further comprising a charge detection unit connected to the control unit, the charge detection unit configured to detect an on state of the battery cell assembly and the power source, and send a heating signal to the control unit when the battery cell assembly is on with the power source, the control unit controlling the first switch to be turned off and the second switch to be turned on according to the heating signal.

6. The cell assembly of claim 3, wherein the first electrode further comprises at least one fourth electrode tab, the cell assembly further comprising a second switching unit for receiving the control signal and for conducting the first conductive terminal and the second electrode tab under the control signal; or receiving the control signal and conducting the first conducting end and the fourth electrode under the action of the control signal.

7. The cell assembly of claim 6, wherein the second switch unit comprises a third switch and a fourth switch, one end of the third switch and one end of the fourth switch are both connected to the first conductive terminal, the other end of the third switch is connected to the second tab, the other end of the fourth switch is connected to the fourth tab, the control signal further comprises a third control signal and a fourth control signal, and the third control signal is used for controlling the third switch to be turned on and the fourth switch to be turned off; the fourth control signal is used for controlling the third switch to be opened and the fourth switch to be turned on.

8. The cell assembly of claim 7, wherein during a first heating phase, the control unit controls the first switch to open, the second switch to conduct, the third switch to conduct, and the fourth switch to open; in a second heating stage, the control unit controls the first switch to be turned on, the second switch to be turned off, the third switch to be turned off and the fourth switch to be turned on; a time interval is provided between the first heating stage and the second heating stage.

9. The cell assembly according to any one of claims 2 to 8, wherein the second electrode comprises two long sides and two short sides connected between the two long sides, the length of the long sides is greater than or equal to the length of the short sides, and the second electrode tab and the third electrode tab are respectively located at the two short sides; or the second lug and the third lug are positioned on one long side and are respectively close to the two short sides; or the second lug and the third lug are positioned on one short side and are respectively close to the two long sides.

10. The cell assembly of claim 9, wherein the first electrode, the separator, and the second electrode form at least a portion of the cell assembly after being wound together, the long side of the second electrode is a wound side, and the second tab and the third tab are located on one of the long sides and are adjacent to the two short sides, respectively.

11. The cell assembly of claim 9, wherein the first electrode comprises a plurality of first sub-electrode tabs and a plurality of first sub-electrode tabs, the plurality of first sub-electrode tabs are stacked and spaced apart from each other, each first sub-electrode tab is connected to one of the first sub-electrode tabs, and the plurality of first sub-electrode tabs are connected in parallel to form the first tab; the second electrode comprises a plurality of second sub-electrode plates, a plurality of second sub-electrode lugs and at least one third sub-electrode lug, the second sub-electrode plates are mutually stacked and arranged at intervals, and each second sub-electrode plate is arranged between two adjacent first sub-electrode plates; each second sub-tab is connected with one second sub-electrode plate, and the plurality of second sub-tabs are connected in parallel to form the second tab; each third sub-tab is connected with one second sub-electrode plate; the at least one third sub-tab forms the third tab.

12. The cell assembly of claim 11 wherein the number of third sub-tabs is one.

13. The cell assembly of claim 11, wherein the number of third sub-tabs is a plurality, and wherein the plurality of third sub-tabs are connected in parallel to form the third tab.

14. The cell assembly of claim 11, wherein the number of the third sub-tabs is plural, the second switch includes plural sub-switches, each of the sub-switches is connected to one of the third sub-tabs and the second conductive terminal, and the sub-switch is configured to receive the control signal and be turned on or off by the control signal.

15. The cell assembly of claim 11, wherein a plurality of the second sub-electrode tabs comprise adjacently disposed first and second electrode units, a plurality of the second sub-tabs comprise first and second tab units, the first tab unit is connected to the first electrode unit, the second tab unit is connected to the second electrode unit, and the at least one third sub-tab comprises a third tab unit connected to the first electrode unit;

The battery cell assembly further comprises at least one fifth switch, at least one sixth switch and at least one seventh switch, wherein two ends of the fifth switch are respectively connected with the first electrode lug unit and the second electrode lug unit, two ends of the sixth switch are respectively connected with one end, far away from the first electrode lug unit, of the first electrode unit and one end, far away from the second electrode lug unit, of the second electrode unit, and two ends of the seventh switch are respectively connected with the third electrode lug unit and the second conducting end;

The fifth switch, the sixth switch and the seventh switch are all connected with the control unit, and the control signal is used for controlling the fifth switch to be turned off, the sixth switch to be turned on and the seventh switch to be turned on so that the third ear unit, the first electrode unit, the second electrode unit and the second ear unit are sequentially connected in series; the control signal is also used for controlling the fifth switch to be turned on, the sixth switch to be turned off and the seventh switch to be turned off so as to enable the first electrode unit and the second electrode unit to be connected in parallel.

16. The cell assembly of claim 15, wherein the first electrode unit, the second electrode unit, the first tab unit, the second tab unit, the third tab unit, the fifth switch, the sixth switch, and the seventh switch are one loop unit, the cell assembly comprising a plurality of the loop units, the second tab unit of one loop unit being connected to the first tab unit of an adjacent loop unit.

17. The cell assembly of any one of claims 1-8, further comprising a heating element coupled between the third tab and the first switching element.

18. A battery assembly, comprising a protection circuit and the cell assembly according to any one of claims 1 to 17, wherein the first tab, the second tab and the third tab are all connected to the protection circuit.

19. An electronic device comprising the battery assembly of claim 18, the battery assembly being connected to the power source by an electrical connection line; or the battery assembly is connected with the power supply in a wireless charging mode.

20. An electronic device comprising the battery assembly of claim 18, the battery assembly being a first battery assembly, the electronic device further comprising a second battery assembly, the second battery assembly being the power source.