Cell components, battery components and electronic equipment

Abstract

The present application discloses a battery cell assembly, a battery assembly and an electronic device, wherein the electrode sheet includes a current collector and a heating layer connected to the current collector, and the heating layer is used to receive current from a power source and generate heat. The electrode sheet includes a current collector and a heating layer connected to the current collector, so that when the current collector and the heating layer are connected to a power source, the heating layer can receive current and heat, so that the temperature of the electrode sheet is increased, so that the electrode sheet can improve the conductive efficiency in a harsh environment and ensure safety.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a battery cell assembly, a battery assembly and an electronic device. Background Art

[0002] Batteries are essential in mobile phones, and the charging of batteries is easily affected by the environment of the mobile phone. As mobile phones are often exposed to harsh environments, the charging efficiency of batteries is reduced and safety issues are prone to occur. Summary of the invention

[0003] Embodiments of the present application provide a cell assembly, a battery assembly, and an electronic device.

[0004] An embodiment of the present application provides an electrode sheet, wherein the electrode sheet includes a current collector and a heating layer conductively connected to the current collector, and the heating layer is used to receive current from a power source and generate heat.

[0005] An embodiment of the present application provides a battery cell assembly, wherein the battery cell assembly includes the above-mentioned electrode sheet.

[0006] The present application embodiment provides a battery cell assembly, wherein:

[0007] The battery core assembly comprises:

[0008] A first electrode sheet, the first electrode sheet comprising a first current collector and a first heating layer in electrical communication with the first current collector;

[0009] A second electrode sheet, disposed opposite to the first electrode sheet, wherein the second electrode sheet comprises a second current collector;

[0010] A power input circuit, comprising a first conductive end and a second conductive end, and a control unit electrically connected to the first conductive end and the second conductive end, wherein the first conductive end and the second conductive end are used to be electrically connected to an input power source, and the control unit is also electrically connected to the first current collector, the first heating layer, and the second current collector;

[0011] When the control unit receives a first control signal, the control unit connects the first conductive end to the first current collector, connects the second conductive end to the second current collector, and disconnects the first heating layer;

[0012] When the control unit receives the second control signal, the control unit connects the first conductive end to the first current collector, connects the second conductive end to the first heating layer, and disconnects the second conductive end from the second current collector.

[0013] An embodiment of the present application provides a battery assembly, wherein the battery assembly includes a protection circuit and the above-mentioned battery cell assembly, and the first electrode sheet and the second electrode sheet are connected to the protection circuit.

[0014] An embodiment of the present application provides an electronic device, wherein the electronic device includes the above-mentioned battery assembly, and the battery assembly is connected to the power source via an electrical connection line; or, the battery assembly is connected to the power source via a wireless charging method.

[0015] An embodiment of the present application provides an electronic device, wherein the electronic device includes the above-mentioned battery assembly, the battery assembly is a first battery assembly, and the electronic device also includes a second battery assembly, and the second battery assembly is the power source.

[0016] The electrode sheet, battery cell assembly, battery assembly and electronic device provided in the embodiments of the present application use an electrode sheet including a current collector and a heating layer conductive with the current collector, so that when the current collector and the heating layer are connected to power, the heating layer can receive current for heating, thereby increasing the temperature of the electrode sheet, thereby improving the conductivity efficiency of the electrode sheet in harsh environments and ensuring safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the application, the drawings required for use in the implementation will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 is a three-dimensional schematic diagram of an electronic device provided in an embodiment of the present application;

[0019] Figure 2 yes Figure 1 An exploded schematic diagram of an electronic device;

[0020] Figure 3 yes Figure 1 A schematic diagram of a charging circuit block diagram of a battery assembly of an electronic device;

[0021] Figure 4 is an exploded schematic diagram of a battery assembly provided in an embodiment of the present application;

[0022] Figure 5 is a cross-sectional schematic diagram of a battery cell assembly provided in an embodiment of the present application;

[0023] Figure 6 yes Figure 5 An exploded schematic diagram of a battery cell assembly;

[0024] Figure 7 yes Figure 6 A schematic cross-sectional view of a first electrode sheet of a battery cell assembly;

[0025] Figure 8 yes Figure 6 A schematic diagram of the structure of the battery cell assembly connected to the power supply;

[0026] Fig. 9 yes Figure 6 Another structural schematic diagram of a battery cell assembly connected to a power source;

[0027] Fig.10 This is a schematic diagram of a structure of a battery cell assembly connected to a power source provided in another embodiment of the present application;

[0028] Fig.11 yes Fig.10 Another schematic diagram of the structure of the battery cell assembly connected to the power supply;

[0029] Fig.12 yes Fig. 9 A schematic diagram of the structure of the battery cell assembly connected to the power supply;

[0030] Fig.13 is a cross-sectional schematic diagram of a first electrode sheet of a battery cell assembly provided in an embodiment of the present application;

[0031] Fig.14 yes Fig.13 A three-dimensional schematic diagram of a first electrode sheet;

[0032] Fig.15 yes Fig.13 A cross-sectional schematic diagram of another embodiment of the first electrode sheet;

[0033] Fig.16 yes Fig.13 A cross-sectional schematic diagram of another embodiment of the first electrode sheet;

[0034] Fig.17 yes Fig.13 A cross-sectional schematic diagram of another embodiment of the first electrode sheet;

[0035] Fig.18 yes Fig.13 A cross-sectional schematic diagram of another embodiment of the first electrode sheet;

[0036] Fig.19 yes Fig.13 A cross-sectional schematic diagram of another embodiment of the first electrode sheet;

[0037] Fig. 20 yes Fig. 9 Another structural schematic diagram of a battery cell assembly connected to a power source;

[0038] Fig.21 yes Fig. 20A schematic diagram of another embodiment of connecting a battery cell assembly to a power source;

[0039] Fig. 22 yes Fig.21 A schematic diagram of a state in which a battery cell assembly is connected to a power source;

[0040] Fig.23 yes Fig.21 A schematic diagram of another state where the battery cell assembly is connected to a power source;

[0041] Fig.24 yes Fig.21 Another partial block diagram of a battery cell assembly connected to a power source;

[0042] Fig.25 It is a curve diagram of a battery cell assembly with a capacity of 5100mAh provided in the present application, which is charged at 0.7C at room temperature of 25°C and charged at a rate of 1.5C after being heated to 50°C;

[0043] Fig.26 yes Fig.10 Another structural schematic diagram of a battery cell assembly connected to a power source;

[0044] Fig. 27 yes Fig.26 A schematic diagram of the structure of the battery cell assembly connected to the power supply;

[0045] Fig.28 yes Fig.26 A structural schematic diagram of another embodiment of a battery cell assembly connected to a power source;

[0046] Fig.29 yes Fig.28 A schematic diagram of a state in which a battery cell assembly is connected to a power source;

[0047] Fig.30 yes Fig.28 A schematic diagram of another state where the battery cell assembly is connected to a power source;

[0048] Fig.31 A schematic structural diagram of a first arrangement of a first electrode tab and a second electrode tab in a first electrode provided in an embodiment of the present application;

[0049] Fig.32 A schematic structural diagram of a second arrangement of the first electrode tab and the second electrode tab in the first electrode provided in an embodiment of the present application;

[0050] Fig.33 A schematic structural diagram of a third arrangement of the first electrode tab and the second electrode tab in the first electrode provided in an embodiment of the present application;

[0051] Fig.34 A schematic structural diagram of a fourth arrangement of the first electrode tab and the second electrode tab in the first electrode provided in an embodiment of the present application;

[0052] Fig.35 yes Figure 4 A schematic diagram of the structure of another battery cell assembly in the provided battery assembly;

[0053] Fig.36 yes Figure 4 A schematic diagram of the structure of another battery cell assembly in the provided battery assembly;

[0054] Fig.37 yes Fig.36 A schematic structural diagram of another embodiment of a battery cell assembly;

[0055] Fig.38 yes Fig.36 A schematic structural diagram of another embodiment of a battery cell assembly;

[0056] Fig.39 yes Fig.36 A schematic structural diagram of another embodiment of a battery cell assembly;

[0057] Fig.40 It is a schematic diagram of a structure in which multiple battery cell assemblies are charged with each other according to an embodiment of the present application;

[0058] Fig.41 It is a structural schematic diagram of wireless charging of a battery cell assembly provided in an embodiment of the present application. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The embodiments listed in the present application can be appropriately combined with each other.

[0060] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0061] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0062] It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. For simplicity, only some numerical ranges are explicitly disclosed herein. However, any lower limit can be combined with any upper limit to form an unambiguous range; and any lower limit can be combined with other lower limits to form an unambiguous range, and any upper limit can be combined with any other upper limit to form an unambiguous range. In addition, although not explicitly stated, each point or single value between the end points of the range is included in the range. Thus, each point or single value can be combined with any other point or single value as its own lower limit or upper limit or with other lower limits or upper limits to form an unambiguous range. In the description herein, it should be noted that, unless otherwise stated, "above" and "below" are inclusive of the number, and the meaning of "multiple" in "one or more" is more than two. The above-mentioned content of the invention is not intended to describe each disclosed embodiment or each implementation in the present invention. The following description more specifically illustrates exemplary embodiments. In many places throughout the application, guidance is provided by a series of embodiments, which can be used in various combinations. In each example, the enumeration is only a representative group and should not be interpreted as exhaustive.

[0063] Please refer to Figure 1 , FIG. 1 is a schematic diagram of the structure of an electronic device 100 provided in an embodiment of the present application. The electronic device 100 may be a rechargeable device such as a telephone, a television, a tablet computer, a mobile phone, a camera, a personal computer, a laptop computer, a wearable device, an electric car, an airplane, etc. Referring to the figure, the electronic device 100 is described as a mobile phone in this application. Those skilled in the art can easily think of structural design for other rechargeable devices based on the technical means of this embodiment to improve the charging efficiency.

[0064] For ease of description, Figure 1 The electronic device 100 is defined with reference to the first viewing angle, the width direction of the electronic device 100 is defined as the X direction, the length direction of the electronic device 100 is defined as the Y direction, and the thickness direction of the electronic device 100 is defined as the Z direction.

[0065] Please refer to Figure 2 , the 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 also includes a display screen 20, a middle frame 30 and a housing 40. The display screen 20, the middle frame 30 and the housing 40 are fixedly connected in sequence. The battery assembly 10 is arranged in the middle frame 30. The battery assembly 10 is used to power the display screen 20 and devices such as a mainboard arranged on the middle frame 30.

[0066] 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, and nano batteries. The present application embodiment takes the battery assembly 10 as a lithium-ion battery as an example for explanation, and those skilled in the art can easily think of structural design for other types of batteries based on the technical means of this embodiment.

[0067] The present application does not specifically limit the shape of the battery assembly 10. The battery assembly 10 may be in a columnar form, a bag-shaped form, an arc-shaped form, a soft-pack square form, a cylindrical form, a rhombus form, or a special shape.

[0068] Please refer to Figure 3 The electronic device 100 further includes a charging interface 50 , a charging circuit 60 and a charging control unit 70 .

[0069] Please refer to Figure 2 The charging interface 50 is provided on the middle frame 30 so that the charging interface 50 is connected to an external power source (hereinafter referred to as power source). Specifically, the charging interface 50 can be connected to the power source 200 via a charging cable. The types of the charging interface 50 include but are not limited to the Micro USB interface of Android and Windows phone system phones, the USB Type C interface, and the Lightning interface of the IOS system phone.

[0070] Please refer to Figure 3 The charging circuit 60 connects the charging interface 50 and the battery assembly 10. The charging circuit 60 may be an integrated chip, which is disposed on the mainboard and is used to control the charging current of the battery assembly 10. The charging interface 50 is connected to the charging circuit 60 through a flexible circuit board.

[0071] Please refer to Figure 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.

[0072] Please refer to Figure 3, the battery assembly 10 is connected to the power supply 200 via the charging circuit 60, so that the power supply 200 charges the battery assembly 10. The current output end of the power supply 200 includes a first output end 210 and a second output end 220. The first output end 210 is the positive end of the power supply 200, and the second output end 220 is the negative end of the power supply 200; or, the first output end 210 is the negative end of the power supply 200, and the second output end 220 is the positive end of the power supply 200. By connecting the first output end 210 and the second output end 220 with the charging circuit 60, the power supply 200 can charge the battery assembly 10. The power supply 200 can be an external power supply of the electronic device 100, for example, the power supply 200 is a power supply formed by connecting a power adapter disposed outside the electronic device 100 and a mains cable, or it can be a mobile power supply disposed outside the electronic device 100. When the power supply 200 is an external power supply of the electronic device 100, the power supply 200 can be connected to the charging circuit 60 via the charging interface 50. The charging interface 50 includes a first charging terminal 51 and a second charging terminal 52. The first charging terminal 51 is connected to the first output terminal 210. The second charging terminal 52 is connected to the second output terminal 220.

[0073] It is understandable that the power supply 200 may also be an internal power supply 200 of the electronic device 100. For example, the power supply 200 is a spare battery assembly 10 disposed in the electronic device 100. When the power supply 200 is an internal power supply 200 of the electronic device 100, the power supply 200 may be directly connected to the charging circuit 60. In this embodiment, the first output terminal 210 is a negative terminal, and the second output terminal 220 is a positive terminal. When current flows through the second output 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 output terminal 210, the battery assembly 10 is charged.

[0074] In order to more clearly describe the charging process and charging circuit, the present application takes the state where the battery assembly 10 is connected to the positive and negative electrodes of the power source 200 as an example for illustration. When the tabs are connected to the conductive ends of the power source 200, no further description will be given.

[0075] Please refer to Figure 4 In this embodiment, the battery assembly 10 includes a battery cell assembly 1 and a battery housing 2. Of course, in other embodiments, the battery assembly 10 may not have a battery housing 2, and the protection circuit may be encapsulated in the encapsulation layer 8 of the battery cell assembly 1.

[0076] Please refer to Figure 5, the battery cell assembly 1 includes a first electrode sheet 4, a second electrode sheet 5, an electrolyte 6, a separator 7 and an encapsulation layer 8. Optionally, the first electrode sheet 4 forms the positive electrode of the battery cell assembly 1, and the second electrode sheet 5 forms the negative electrode of the battery cell assembly 1. Optionally, the first electrode sheet 4 forms the negative electrode of the battery cell assembly 1, and the second electrode sheet 5 forms the positive electrode of the battery cell assembly 1. This embodiment is described by taking the example that the first electrode sheet 4 forms the positive electrode of the battery cell assembly 1, and the second electrode sheet 5 forms the negative electrode of the battery cell assembly 1.

[0077] Please refer to Figure 6 The first electrode sheet 4 includes a first current collector 41 and a first active material 42 disposed on the first current collector 41. If the first electrode sheet 4 is a positive electrode, the first current collector 41 is a positive electrode current collector. If the first electrode sheet 4 is a negative electrode, the first current collector 41 is a negative electrode current collector.

[0078] Optionally, the first current collector 41 is a conductive sheet. For example, the first current collector 41 is an aluminum foil with a thickness of 10-20 microns. The first active material 42 includes a layered or spinel transition metal oxide or polyanion compound with a high electrode potential and a stable structure and lithium insertion ability, such as lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, ternary materials, etc. The first active material layer 42 is a mixture of an active substance and a binder. The first active material layer 42 is attached to the surface of the first current collector 41. The active substance can be at least one of lithium iron phosphate, lithium iron manganese phosphate, lithium vanadium phosphate, lithium vanadium phosphate, lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, lithium nickel cobalt manganese oxide, lithium-rich manganese-based materials, lithium nickel cobalt aluminum oxide, graphite, silicon oxide, tin oxide, lithium titanate, etc., and the binder can be at least one of polyvinylidene fluoride, copolymer of vinylidene fluoride-fluorinated olefin, polytetrafluoroethylene, sodium carboxymethyl cellulose, styrene-butadiene rubber, polyurethane, fluorinated rubber, polyvinyl alcohol, polyvinylidene fluoride, polyamide, etc.

[0079] Optional, see Figure 6 , the first electrode sheet 4, the diaphragm 7 and the second electrode sheet 5 are all in the form of thin sheets. The diaphragm 7 is arranged between the first electrode sheet 4 and the second electrode sheet 5 to prevent the first electrode sheet 4 from directly contacting the second electrode sheet 5. The diaphragm 7 is a specially formed polymer film, and the diaphragm 7 has a microporous structure that allows lithium ions to pass freely, but electrons cannot pass. The material of the diaphragm 7 includes but is not limited to polyethylene (PE), polypropylene (PP) or their composite films. The composite film is, for example, a PP / PE / PP three-layer diaphragm.

[0080] Optional, see Figure 6The second electrode sheet 5 includes a second current collector 51 and a second active material 52 disposed on the second current collector 51. The second current collector 51 is a conductive sheet. For example, the second current collector 51 is a copper foil of 10-20 microns. The second active material 52 can be layered graphite, metal element and metal oxide, such as graphite, carbon fiber, graphene, lithium titanate, etc., which has a potential as close to the lithium potential as possible, a stable structure and can store a large amount of lithium.

[0081] Optional, see Figure 6 The packaging layer 8 is a steel shell, an aluminum shell, a nickel-plated iron shell, an aluminum-plastic film, etc. In this embodiment, the packaging layer 8 can be an aluminum-plastic film, which is used to package the first electrode sheet 4 , the second electrode sheet 5 and the diaphragm 7 .

[0082] Optional, see Figure 6 The electrolyte 6 can be an organic solvent dissolved with electrolyte lithium salt to provide lithium ions. The electrolyte lithium salt includes LiPF6, LiClO4, LiBF4, etc. The organic solvent is mainly composed of one or a mixture of diethyl carbonate (DEC), propylene carbonate (PC), ethylene carbonate (EC), dimethyl carbonate (DMC), etc.

[0083] During the charging and discharging process of the battery assembly 10, Li+ is intercalated and deintercalated between the first electrode sheet 4 and the second electrode sheet 5. During charging, Li+ is deintercalated from the first electrode sheet 4 (positive electrode) and is intercalated into the second electrode sheet 5 (negative electrode) through the electrolyte 6, and the second electrode sheet 5 is in a lithium-rich state. The opposite is true during discharge. In other words, the first electrode sheet 4 and the second electrode sheet 5 can be electrically conductive when both are powered on.

[0084] The first electrode sheet 4 and the second electrode sheet 5 of the battery cell assembly 1 are both connected to the protection circuit 3. The protection circuit 3 can monitor the voltage of the battery cell assembly 1, so as to control the charging and discharging of the battery cell assembly 1.

[0085] See also Figure 7 The first electrode sheet 4 further includes a first heating layer 43 that is in electrical communication with the first current collector 41. The first heating layer 43 and the first current collector 41 may be in direct contact and electrical communication, or may be connected and electrical communication via a conductive cable, or may be coupled and electrical communication via a coupling element. In this embodiment, an example is given in which the first heating layer 43 and the first current collector 41 are stacked, attached, contacted and electrical communication.

[0086] Optionally, the first heating layer 43 is a metal sheet, and the material of the first heating layer 43 is composed of at least one of aluminum, copper, nickel, copper, cobalt, tungsten, tin, lead, iron, silver, gold, platinum or their alloys.

[0087] Optionally, the thickness of the first heating layer 43 is 1 mm to 40 mm.

[0088] Optionally, the first heating layer 43 is formed on the first current collector 41 by at least one of coating, calendering, rolling, bonding, evaporation, vapor deposition, chemical deposition, magnetron sputtering, and chemical plating.

[0089] When the first current collector 41 and the first heating layer 43 are together in a loop connecting the first output terminal 210 and the second output terminal 220, the first heating layer 43 generates Joule heat, thereby heating the battery cell assembly 1 and increasing the temperature of the battery cell assembly 1, so that the battery cell assembly 1 is charged after the temperature reaches a preset temperature, thereby ensuring the charging safety and charging efficiency of the battery cell assembly 1. The first heating layer 43 is a conductive layer, and the resistance of the first heating layer 43 is greater than the resistance of the first current collector 41. When the first heating layer 43 is connected to the current of the power supply 200, the heating efficiency of the first heating layer 43 is much greater than the heating efficiency of the first current collector 41 connected to the current, thereby improving the self-heating temperature-raising efficiency of the first electrode sheet 4.

[0090] When the first current collector 41 , the electrolyte 6 , and the second current collector 51 are all in a loop connecting the first output terminal 210 and the second output terminal 220 , a voltage difference is formed between the voltage of the first current collector 41 and the voltage of the second current collector 51 , thereby charging the battery cell assembly 1 .

[0091] It can be understood that the orthographic projection of the first active material layer 42 on the side of the first heating layer 43 facing the first active material layer 42 is located on the first heating layer 43, that is, the first heating layer 43 completely covers the first active material layer 43, so that after the first heating layer 43 generates heat, all areas of the first active material layer 42 can be heated. Optionally, the first heating layer 43 completely overlaps with the first current collector 41, and the first heating layer 43 has an edge that protrudes relative to the first active material layer 43, so that the first active material layer 43 can be completely heated. Of course, in other embodiments, the first heating layer 43 can also completely overlap with the first active material layer 43.

[0092] See also Figure 8 The battery cell assembly 1 also includes a power input circuit 9, which is provided with a first conductive end 91 and a second conductive end 92, and a control unit 93 electrically connected to the first conductive end 91 and the second conductive end 92. The first conductive end 91 and the second conductive end 92 are used to be electrically connected to the power supply 200. The control unit 93 is also electrically connected to the first current collector 41, the first heating layer 43 and the second current collector 51. The power input circuit 9 is arranged on a circuit board, and the circuit board is arranged outside the packaging layer 8. The circuit board and the first electrode sheet 4 and the second electrode sheet 5 can be connected via a conductive cable to enable the control unit 93 to electrically connect the first current collector 41, the first heating layer 43 and the second current collector 51.

[0093] The power input circuit 9 is used to input the current of the power source 200 into the battery cell assembly 1, so that the battery cell assembly 1 obtains electric energy to increase the temperature or / and charge. The first conductive end 91 and the second conductive end 92 together constitute the current receiving port of the power input circuit 9. The first conductive end 91 and the second conductive end 92 are arranged on the circuit board. The first conductive end 91 and the second conductive end 92 are connected to the charging circuit 60 to receive the current of the power source 200 through the charging circuit 60. The first conductive end 91 is a positive terminal, and the second conductive end 92 is a negative terminal.

[0094] In this embodiment, the charging circuit 60 is connected to the first output terminal 210 and the second output terminal 220 of the power supply 200, the power input circuit 9 is connected to the charging circuit 60, the first conductive end 91 is connected to the second output terminal 220, and the second conductive end 92 is connected to the first output terminal 210. After the control unit 93 controls the first conductive end 91 and the second conductive end 92 to be connected to the first current collector 41, the second current collector 51 and the electrolyte 6 to form a loop, the first conductive end 91 and the second conductive end 92 start to receive current, so that the battery cell assembly 1 can obtain electrical energy.

[0095] The control unit 93 is used to control the electric energy obtained by the first conductive end 91 and the second conductive end 92 to charge the battery cell assembly 1 or to heat the battery cell assembly 1 .

[0096] The control unit 93 controls the second conductive end 92 to be connected to the second current collector 51 or to the first heating layer 43, thereby controlling the battery cell assembly 1 to obtain electric energy from the first output end 210 and the second output end 220 for charging or providing it to the first heating layer 43 to generate heat for self-heating.

[0097] The control unit 93 controls the second conductive end 92 to conduct with the second current collector 51 or the first heating layer 43 by receiving a control signal. The control signal received by the control unit 93 comes from the processor of the electronic device 100, or from the communication module of the electronic device 100, or from a sensor device.

[0098] like Figure 8As shown, when the control unit 93 receives the first control signal, the control unit 93 conducts the first conductive end 91 with the first current collector 41, and conducts the second conductive end 92 with the second current collector 51, and disconnects the first heating layer 43, so that the first current collector 41, the electrolyte 6, and the second current collector 51 are connected to the first conductive end 91 and the second conductive end 92, and the first electrode sheet 4 and the second electrode sheet 5 are respectively connected to the positive and negative electrodes of the power supply 200, and a potential difference is generated between the first electrode sheet 4 and the second electrode sheet 5. Under the action of the potential difference, lithium ions move from the first electrode sheet 4 to the second electrode sheet 5, so as to realize the charging of the battery assembly 10. At this time, the battery assembly 10 enters the charging mode. The first control signal is a control signal for controlling the charging of the battery cell assembly 1. Of course, in other embodiments, the first conductive end 91 may be connected to the first heating layer 43, so that the first conductive end 91 is indirectly connected to the first current collector 41 via the first heating layer 43, thereby generating a potential difference between the first current collector 41 and the second current collector 51, and charging the battery cell assembly 1.

[0099] like Fig. 9 As shown, when the control unit 93 receives the second control signal, the control unit 93 conducts the first conductive end 91 with the first current collector 41, and conducts the second conductive end 92 with the first heating layer 43, and disconnects it from the second current collector 51, so that the first current collector 41 and the first heating layer 43 are connected to the first conductive end 91 and the second conductive end 92, and the first heating layer 43 receives the electric energy input from the first conductive end 91 and the second conductive end 92, and converts the electric energy into Joule heat energy, so that the first heating layer 43 heats up, and the first heating layer 43 heats the battery cell assembly 1. The second control signal is a control signal for controlling the heating and temperature rise of the first electrode sheet 4 of the battery cell assembly 1. Of course, in other embodiments, the second conductive end 92 may be connected to the gap between the first current collector 41 and the first conductive end 91, so that the second conductive end 92 is indirectly connected to the first heating layer 43 via the first current collector 41, thereby enabling the first heating layer 43 to obtain electrical energy from the first conductive end 91 and the second conductive end 92 for heating; of course, the first conductive end 91 may be directly connected to the first heating layer 43, and the second conductive end 92 may be connected to the gap between the first heating layer 43 and the first conductive end 91, so that the first heating layer 43 can directly obtain electrical energy from the first conductive end 91 and the second conductive end 92 for heating.

[0100] It is understandable that when the electronic device 100 is in a low temperature environment, the internal reaction rate of the battery assembly 10 of the electronic device 100 decreases, that is, the rate of lithium ion deintercalation and intercalation between the first active material layer 42 and the second active material 52 decreases, resulting in a slower charging rate of the battery assembly 10, and fast charging cannot be achieved, affecting the use of the electronic device 100. In terms of the safety of the battery assembly 10, charging the battery assembly 10 in a low temperature environment will cause lithium deposition at the negative electrode, that is, lithium crystals will form on the negative electrode of the battery assembly 10. Due to the occurrence of lithium deposition inside the battery assembly 10, the charging capacity of the battery assembly 10 is easily reduced, and the lithium crystals will also puncture the diaphragm 7, causing safety accidents. The battery cell assembly 1 of the present application uses the first current collector 41 to conduct with the first heating layer 43. When the battery assembly 10 is in a low temperature environment, the control unit 93 controls the first current collector 41 and the first heating layer 43 to connect with the first conductive end 91 and the second conductive end 92, so that the first heating layer 43 receives electric energy for heating, so that the battery cell assembly 1 is in a self-heating mode to increase the temperature of the battery cell assembly 1, so as to facilitate the charging of the battery cell assembly 1 after the temperature reaches the requirement, ensure the charging safety of the battery assembly 10, and ensure the charging efficiency of the battery assembly 10. When the temperature of the battery cell assembly 1 rises to meet the charging requirements, the control unit 93 controls the first current collector 41 and the second current collector 51 to connect with the first conductive end 91 and the second conductive end 92 respectively, so as to achieve a potential difference between the first electrode sheet 4 and the second electrode sheet 5, that is, the battery cell assembly 1 is in a charging mode.

[0101] See also Fig.10 In another embodiment, the second electrode sheet 5 is further provided with a second heating layer 53 which is electrically connected to the second current collector 51 .

[0102] In this embodiment, the second heating layer 53 and the second current collector 51 can be directly in contact and conductive, or they can be connected and conductive via a conductive cable, or they can be coupled and conductive via a coupling element. In this embodiment, the second heating layer 53 and the second current collector 51 are stacked, attached, contacted and conductive as an example. The second heating layer 53 can be made of the same material as the first heating layer 43, or it can be made of a different material from the first heating layer 43. The second heating layer 53 can be set to the same thickness as the first heating layer 43, or it can be set to a different thickness from the first heating layer 43. The second heating layer 53 can be formed on the second current collector 51 using the same molding process as the first heating layer 43, or it can be formed on the second current collector 51 using a different molding process from the first heating layer 43. The structure of the second heating layer 53 combined with the second current collector 51 can refer to the structure of the first heating layer 42 combined with the first current collector 41, and will not be repeated here.

[0103] Optionally, the second heating layer 53 is a metal sheet, and the material of the second heating layer 53 is composed of at least one of aluminum, copper, nickel, copper, cobalt, tungsten, tin, lead, iron, silver, gold, platinum or their alloys.

[0104] Optionally, the thickness of the second heating layer 53 is 1 mm to 40 mm.

[0105] Optionally, the second heating layer 53 is formed on the second current collector 51 by at least one of coating, calendering, rolling, bonding, evaporation, vapor deposition, chemical deposition, magnetron sputtering, and chemical plating.

[0106] When the second current collector 51 and the second heating layer 53 are in a loop connecting the first output terminal 210 and the second output terminal 220 through the power input circuit 9 and the charging circuit 60, the second heating layer 53 generates Joule heat, thereby heating the battery cell assembly 1 and increasing the temperature of the battery cell assembly 1, so that the battery cell assembly 1 is charged after the temperature reaches a preset temperature, thereby ensuring the charging safety and charging efficiency of the battery cell assembly 1. The second heating layer 53 is a conductive layer, and the resistance of the second heating layer 53 is greater than the resistance of the second current collector 51. When the second heating layer 53 is connected to the current of the power supply 200, the heating efficiency of the second heating layer 53 is much greater than the heating efficiency of the second current collector 51 connected to the current, thereby improving the self-heating temperature-raising efficiency of the second electrode sheet 4.

[0107] It can be understood that the second heating layer 53 is combined with the second current collector 51, so that the second electrode sheet 5 can receive current for heating, that is, the negative electrode of the battery cell assembly 1 can receive current for heating. The first electrode sheet 4 and the second electrode sheet 5 are respectively provided with the first heating layer 43 and the second heating layer 53, that is, the positive electrode and the negative electrode of the battery cell assembly 1 both have the function of heating by power on, so that the battery cell assembly 1 can select the first electrode sheet 4 for heating and heating as needed, or can select the second electrode sheet 5 for heating and heating to meet the different heating and heating requirements of the battery cell assembly 1. Of course, if the first electrode sheet 4 is the negative electrode of the battery cell assembly 1, and the second electrode sheet 5 is the positive electrode of the battery cell assembly 1, then the second electrode sheet 5 can also be provided with only the second current collector 51, that is, the battery cell assembly 1 is only provided with the negative electrode with the function of heating by power on.

[0108] In this embodiment, the control unit 93 is also electrically connected to the second heating layer 53. The control unit 93 can control the first conductive end 91 to be connected to the first current collector 41 or the second heating layer 53. When the control unit 93 controls the first conductive end 91 to be connected to the first current collector 41, the first conductive end 91 is disconnected from the second heating layer 53. The control unit 93 also controls the second conductive end 92 to be connected to the second current collector 51, and the second conductive end 92 is disconnected from the first heating layer 43. At this time, if the first conductive end 91 and the second conductive end 92 are connected to the path of the first output end 210 and the second output end 220 through the charging circuit 60, the battery cell assembly 1 is charged. When the control unit 93 controls the first conductive end 91 to be disconnected from the first current collector 41, the first conductive end 91 is connected to the second heating layer 53, and the control unit 93 also controls the second conductive end 92 to be connected to the second current collector 51, and the second conductive end 92 is disconnected from the first heating layer 43. At this time, if the first conductive end 91 and the second conductive end 92 are connected to the passage of the first output end 210 and the second output end 220 through the charging circuit 60, the battery cell assembly 1 can be heated by energizing the second heating layer 53.

[0109] like Fig.10 As shown, when the control unit 93 receives the third control signal, the control unit 93 conducts the first conductive end 91 with the second heating layer 53 and disconnects it from the first current collector 41, and conducts the second conductive end 92 with the second electrode tab and disconnects it from the first heating layer 43, so that the second heating layer 53 and the second current collector 51 are connected to the first conductive end 91 and the second conductive end 92 as a whole, and the second heating layer 53 receives the current of the first conductive end 91 and the second conductive end 92, and generates Joule heat to achieve the heating of the second electrode sheet 5. The third control signal is a control signal for controlling the heating of the second electrode sheet 5 of the battery cell assembly 1. Of course, in other embodiments, when the control unit 93 receives the third control signal, it can also control the first conductive end 91 to be connected to the gap between the second current collector 51 and the second conductive end 92, so that the first conductive end 91 is indirectly connected to the second heating layer 53 through the second current collector 51, so that the second heating layer 53 obtains the electric energy from the first conductive end 91 and the second conductive end 92 for heating; of course, the second conductive end 92 can also be directly connected to the second heating layer 53, and the first conductive end 91 can be connected to the gap between the second heating layer 53 and the first conductive end 91, so that the second heating layer 53 directly obtains the electric energy from the first conductive end 91 and the second conductive end 92 for heating.

[0110] Please also read Fig. 9 and Fig.10The difference between the third control signal and the second control signal is that the third control signal is used to instruct the control unit 93 to control different electrodes in the battery cell assembly 1 to heat up. It can be understood that the second control signal instructs the control unit 93 to control the positive electrode of the battery cell assembly 1 to heat up, while the third control signal instructs the control unit 93 to control the negative electrode of the battery cell assembly 1 to heat up.

[0111] Optionally, the second control signal includes a first voltage value and a first duration, and the control unit 93 controls the voltage connected to the first heating layer 43 according to the first voltage value to control the heating temperature of the first heating layer 43. The control unit 93 controls the duration of the first heating layer 43 receiving the current according to the first duration, so that when the duration of the first heating layer 43 receiving the current reaches the first duration, the connection with the first conductive end 91 and the second conductive end 92 is disconnected. The third control signal includes a second voltage value and a second duration, and the control unit 93 controls the voltage connected to the second heating layer 53 according to the second voltage value to control the heating temperature of the second heating layer 53. The control unit 93 controls the duration of the second heating layer 53 receiving the current according to the second duration, so that when the duration of the second heating layer 53 receiving the current reaches the second duration, the connection with the first conductive end 91 and the second conductive end 92 is disconnected.

[0112] In one usage scenario, the control unit 93 controls the first electrode sheet 4 and the second electrode sheet 5 to be heated alternately and cyclically according to the first heating mode and the second heating mode, respectively. Specifically, when the first electrode sheet 4 is heated according to the first heating mode, the control unit 93 controls the first electrode sheet 4 of the battery cell assembly 1 to heat up at the first voltage, and after the first heating period is continuously increased, the first electrode sheet 4 is stopped from heating up. When the second electrode sheet 5 is heated according to the second heating mode, the second electrode sheet 5 is controlled to heat up at the second voltage, and after the second heating period is continuously increased, the second electrode sheet 5 is stopped from heating up. The first voltage and the second voltage may be the same or different, and the first duration and the second duration may be the same or different, that is, the first heating mode and the second heating mode may be the same or different. By using the control unit 93 to control the first electrode sheet 4 and the second electrode sheet 5 to be heated alternately and cyclically, the first heating layer 43 and the second heating layer 53 may be heated alternately and cyclically, so as to reduce the loss of the first heating layer 43 and the second heating layer 53, and ensure the temperature rise balance of the battery cell assembly 1.

[0113] It is understandable that in other usage scenarios, the control unit 93 can control the first electrode sheet 4 to be heated according to the first heating mode, and then control the first electrode sheet 4 and the second electrode sheet 5 to start to be connected to the charging circuit 60 and the power supply 200 through the first conductive end 91 and the second conductive end 92 for charging. After the first electrode sheet 4 and the second electrode sheet 5 are charged for a certain period of time, the control unit 93 controls the second electrode sheet 5 to be heated according to the second heating mode, and after the second electrode sheet 5 is heated for a certain period of time, the first electrode sheet 4 and the second electrode sheet 5 are controlled to start to be connected to the charging circuit 60 through the first conductive end 91 and the second conductive end 92 for charging. In the embodiment of the present application, the heating method for the control unit 93 to control the heating of the first heating layer 43 or the heating of the second heating layer 53 is not limited, and the charging method for the control unit 93 to control the first current collector 41 and the second current collector 51 to receive current for charging is also not limited.

[0114] Further, in Fig.10 In the embodiment of the invention, the control unit 93 can also control the first conductive end 91 to be connected to the first current collector 41 and the second heating layer 53, and the second conductive end 92 to be connected to the first heating layer 43 and the second current collector 51, so that the first heating layer 43 and the second heating layer 53 are connected in parallel to the first conductive end 91 and the second conductive end 92, and the first current collector 41 and the second current collector 51 are connected to the first conductive end 91 and the second conductive end 92. The battery cell assembly 1 can be heated by the first heating layer 43 and the second heating layer 53 at the same time, and at the same time, a potential difference can be generated between the first electrode sheet 4 and the second electrode sheet 5 to achieve charging, that is, the battery cell assembly 1 can be heated by the first electrode sheet 4 and the second electrode sheet 5 while being charged by the first electrode sheet 4 and the second electrode sheet 5.

[0115] See also Fig.11 When the control unit 93 receives the fourth control signal, the control unit 93 conducts the first conductive end 91 with the first current collector 41 and the second heating layer 53, and conducts the second conductive end 92 with the first heating layer 43 and the second current collector 51. The fourth control signal is different from the first control signal in that the control unit 93 can be instructed to control the heating and charging of the battery cell assembly 1 at the same time to meet different usage modes of the battery cell assembly 1.

[0116] For further information, see Fig.12 ,exist Fig. 9In the embodiment of the present invention, the battery cell assembly 1 includes a first pole ear 44 connected to the first current collector 41, and a second pole ear 45 connected to the first current collector 41 and / or the first heating layer 43; the battery cell assembly 1 also includes a third pole ear 54 connected to the second current collector 51, and the control unit 93 electrically connects the first pole ear 44, the second pole ear 45 and the third pole ear 54 to control the first pole ear 44 to be disconnected or connected with the first conductive end 91, and to control the second pole ear 45 to be disconnected or connected with the second conductive end 92, and to control the second conductive end 92 to be disconnected or connected with the third pole ear 54.

[0117] In this embodiment, one end of the first pole tab 44 is fixedly connected to the first current collector 41, and the other end of the first pole tab 44 is electrically connected to the control unit 93. The first pole tab 44 may be electrically connected to the control unit 93 via a conductive cable. One end of the second pole tab 45 may be fixedly connected to the first current collector 41, or may be fixedly connected to the first heating layer 43, or may be fixedly connected to both the first current collector 41 and the first heating layer 43. The other end of the second pole tab 45 is electrically connected to the control unit 93, and the second pole tab 45 may be electrically connected to the control unit 93 via a conductive cable. One end of the third pole tab 54 is fixedly connected to the second current collector 51, and the other end is electrically connected to the control unit 93. The third pole tab 54 may be electrically connected to the control unit 93 via a conductive cable.

[0118] By using the first pole tab 44 and the third pole tab 54 to be fixedly connected to the first current collector 41 and the second current collector 51 respectively, the control unit 93 can conduct the first pole tab 44 and the third pole tab 54 to the first conductive end 91 and the second conductive end 92 respectively, so that the first pole tab 44 and the third pole tab 54 are connected to the power supply 200 through the first conductive end 91 and the second conductive end 92 respectively, that is, the control unit 93 controls the first pole tab 44 to connect to the first conductive end 91, and controls the third pole tab 54 to connect to the second conductive end 92, and the first pole tab 44 and the third pole tab 54 respectively constitute the positive pole tab and the negative pole tab of the battery cell assembly 1. The control unit 93 can control the second pole tab 45 to conduct with the second conductive end 92, so that the second pole tab 45 and the first pole tab 44 cooperate to connect the first heating layer 43 to the power supply 200, so that the first heating layer 43 receives current for heating. The second pole tab 45 serves as an independent pole tab of the first electrode sheet 4 , so as to form a negative pole terminal and a positive pole terminal respectively with the first pole tab 44 when the first electrode sheet 4 needs to be heated by current.

[0119] Optionally, the first pole tab 44, the second pole tab 45 and the third pole tab 54 are all made of conductive materials. For example, the first pole tab 44 is made of aluminum (Al) metal, the second pole tab 45 is made of copper metal, and the third pole tab 54 is made of copper metal.

[0120] Optionally, the first electrode tab 44 is welded to the first current collector 41 , the second electrode tab 45 is welded to the first current collector 41 and / or the first heating layer 43 , and the third electrode tab 54 is welded to the second current collector 51 .

[0121] Optionally, the connection methods between the above-mentioned electrode tabs and the current collector and the heating layer include but are not limited to ultrasonic welding, laser welding, riveting, electrical connection with conductive adhesive, etc.

[0122] It can be understood that the first pole ear 44 and the third pole ear 54 are welded to the first current collector 41 and the second current collector 51 respectively, so that when the battery cell assembly 1 is charged, the first current collector 41 and the second current collector 51 preferentially generate a potential difference, thereby improving the charging efficiency, and avoiding the first heating layer 43 from being connected to the first conductive end 91 and the second conductive end 92, so as to reduce the internal resistance of the battery cell assembly 1 when it is in the charging state.

[0123] exist Fig. 9 In the embodiment, Fig.13 As shown, the first electrode sheet 4 is provided with two layers of first current collectors 41 and a first heating layer 43, and the first heating layer 43 is provided between the two layers of first current collectors 41. The first active material layer 42 is attached to the side of the two layers of first current collectors 41 away from the first heating layer 43 to increase the surface utilization rate of the first electrode sheet 4. The first heating layer 43 completely covers the side of the first current collector 41 away from the first active material layer 42, so that after the first heating layer 43 is heated, the first electrode sheet 4 is heated evenly.

[0124] The first heating layer 43 and the two layers of the first current collector 41 can be formed in one piece. After the first heating layer 43 is attached to the two layers of the first current collector 41, the two layers of the first current collector 41 and the first heating layer 43 are rolled to make the first heating layer 43 and the first current collector 41 more firmly combined to ensure the reliability of the first electrode sheet 4. Of course, it is also possible to apply conductive glue on both sides of the first heating layer 43, and then attach the two layers of the first current collector 41 to the two sides of the first heating layer 43 through the conductive glue. It is also possible to plate or vacuum sputter the first heating layer 43 on the side of the first current collector 41 away from the first active material layer 42, and then attach another first current collector 41 to the first heating layer 43.

[0125] Optional, such as Fig.14 As shown, the first pole tab 44 is welded to one of the first current collectors 41, and the second pole tab 45 is welded to the first heating layer 43. Specifically, one of the first current collectors 41 is provided with a hollow hole, and the hollow hole partially exposes the first heating layer 43, and the second pole tab 45 is welded to the portion of the first heating layer 43 exposed in the hollow hole through the hollow hole.

[0126] Optionally, the first pole tab 44 and the second pole tab 45 are both welded to the same first current collector 41 , and the first pole tab 44 and the second pole tab 45 are spaced apart from each other.

[0127] Optionally, the first pole tab 44 and the second pole tab 45 are respectively welded to the two first current collectors 41 , and the first pole tab 44 and the second pole tab 45 are spaced apart from each other.

[0128] In another embodiment, see Fig.15 ,and Fig.14 The embodiments shown are substantially the same, except that the battery cell assembly 1 includes two first pole tabs 44, which are respectively fixed to the two first current collectors 41 on the sides facing away from the first heating layer 43. The protruding portions of the two first pole tabs 44 relative to the first current collectors 41 are fixedly connected together, so that the two first pole tabs 44 together constitute the positive pole tab of the first electrode sheet 4.

[0129] It can be understood that the battery cell assembly 1 can also be provided with two, or three, or more than three second pole ears 45, and two, or three, or more than three second pole ears 45 can be combined and fixedly connected with two layers of first current collectors 41 and one layer of first heating layer 43 in any manner, and the second pole ears 45 only need to be spaced apart from the first pole ears 44, and two, or three, or more than three second pole ears 45 are fixed together to finally form a conductive pole ear for the first heating layer 43 to access the current. Of course, in other embodiments, the battery cell assembly 1 can also be provided with two or more first pole ears 44, and two or more first pole ears 44 can be combined and fixedly connected with two layers of first current collectors 41 and one layer of first heating layer 43 in any manner, and two, or more than two, three first pole ears 44 are fixed together to finally form a positive pole ear of the first electrode sheet 4, and another conductive pole ear for the first heating layer 43 to access the current.

[0130] In the embodiments of the present application, the number of first pole tabs 44 and the number of second pole tabs 45 are not limited, and the connection method of the first pole tab 44 and the first current collector 41 and / or the first heating layer 43, and the connection method of the second pole tab 45 and the first current collector 41 and / or the first heating layer 43 are not limited.

[0131] In another embodiment, see Fig.16 ,and Fig.13 The illustrated embodiments are substantially the same, except that a plurality of first heating layers 43 are disposed between two layers of first current collectors 41 , the plurality of first heating layers 43 are disposed at intervals, and a control unit 93 controls the second conductive end 92 to be connected to one or more of the first heating layers 43 .

[0132] Specifically, the battery cell assembly 1 is provided with a plurality of second pole ears 45, the plurality of second pole ears 45 are arranged at intervals from each other, the plurality of second pole ears 45 are respectively fixedly connected to a plurality of first heating layers 43 correspondingly, and an insulating layer 431 is provided between two adjacent first heating layers 43. When the control unit 93 receives the second control signal, the second control signal includes a heating layer determination signal, and the control unit 93 determines that one or more of the second pole ears 45 are connected to the second conductive end 92 according to the heating layer determination signal, so as to determine that one or more of the first heating layers 43 are connected to the first conductive end 91 and the second conductive end 92, so that the battery cell assembly 1 can select one or more of the receiving currents for heating and temperature rise as needed to meet the various heating and temperature rise modes of the battery cell assembly 1. For example, when the battery cell assembly 1 is in an extremely cold environment and the battery cell assembly 1 needs to heat up quickly, the control unit 93 can control the multiple second pole ears 45 to be connected to the second conductive end 92, so that the multiple first heating layers 43 are simultaneously connected to the first conductive end 91 and the second conductive end 92, so as to meet the simultaneous heating of the multiple first heating layers 43, so that the battery cell assembly 1 can be heated quickly. For another example, when the battery cell assembly 1 is in a slightly low temperature environment, an excessively high heating rate can easily damage the battery cell assembly 1, so the control unit 93 can control one of the second pole ears 45 to be connected to the second conductive end 92, so that one of the first heating layers 43 is heated, so that the battery cell assembly 1 can be heated slowly.

[0133] It can be understood that the multiple first heating layers 43 are respectively connected to the first conductive end 91 and the second end through the first pole ear 44 and the second pole ear 45. The multiple first heating layers 43 can be connected to the first conductive end 91 and the second conductive end 92 in parallel, or in series.

[0134] See also Fig.17 , in another embodiment, with Fig.13 The embodiments shown are substantially the same, except that the first electrode sheet 4 is provided with a first current collector 41 and a first heating layer 43, and the first heating layer 43 is stacked on one side of the first current collector 41. The first electrode sheet 4 is provided with a first current collector 41 and a first heating layer 43, thereby reducing the production cost of the first electrode sheet 4. Specifically, the first electrode sheet 4 is further provided with a protective layer 46, and the protective layer 46 is attached to the side of the first heating layer 43 away from the first current collector 41, and the first heating layer 43 is attached to the first current collector 41. The protective layer 46 protects the first heating layer 43 to ensure the safety of the first heating layer 43, and the protective layer 46 can also increase the durability of the first electrode sheet 4, prevent the first electrode sheet 4 from being punctured, and increase the safety of the battery cell assembly 1.

[0135] See also Fig.18 , in another embodiment, with Fig.13 The embodiments shown are substantially the same, except that the first electrode sheet 4 is provided with a first current collector 41 and a first heating layer 43, and the first heating layer 43 is provided in the first current collector 41. The first heating layer 43 is integrated in the first current collector 41, so that the interior of the first current collector 41 can receive current, the first current collector 41 as a whole can generate heat to increase temperature, and the thin performance of the first electrode sheet 4 is ensured. The first active material layer 42 is provided on both opposite sides of the first current collector 41 to increase the surface utilization rate of the first current collector 41.

[0136] See also Fig.19 , in another embodiment, with Fig.13The embodiments shown are substantially the same, except that the first electrode sheet 4 is provided with a first heating layer 43 and a first current collector 41 spaced apart, and a thermal conductive layer 430 is provided between the first heating layer 43 and the first current collector 41, and the first thermal conductive layer 430 is used to transmit current from the first current collector 41 to the first heating layer 43, or to transmit current from the first heating layer 43 to the first current collector 41, and to transfer the heat of the first heating layer 43 to the first current collector 41 in a balanced manner. The thermal conductive layer 430 completely covers the first current collector 41. When the first heating layer 43 receives current to generate heat, the thermal conductive layer 430 can evenly conduct the heat to various positions of the first current collector 41, so that the first current collector 41 is evenly heated, and the various regions of the battery cell assembly 1 are evenly heated. If a structure in which the first pole ear 44 and the second pole ear 45 are respectively connected to the first current collector 41 and the first heating layer 43 is adopted, when the control unit 93 controls the first pole ear 44 and the second pole ear 45 to be connected to the first conductive end 91 and the second conductive end 92 respectively, the thermally conductive and electrically conductive layer 430 connects the first current collector 41 and the first heating layer 43, so that the first pole ear 44, the first current collector 41, the thermally conductive and electrically conductive layer 430, the first heating layer 43, and the second pole ear form a loop between the first conductive end 91 and the second conductive end 92, so that the first heating layer 43 receives current and generates heat. If the first pole tab 44 and the second pole tab 45 are both connected to the first heating layer 43, when the first pole tab 44 and the second pole tab 45 are connected to the power supply 200, the thermal conductive layer 430 is not responsible for transmitting current to the first current collector 41, but only for transmitting heat to the first current collector 41. When the first pole tab 44 and the third pole tab 54 are connected to the power supply 200, the thermal conductive layer 430 is responsible for transmitting current from the first heating layer 43 to the first current collector 41, so that the first current collector 41 and the second current collector 51 generate a potential difference, so as to realize the charging of the battery cell assembly 1. If the first pole tab 44 and the second pole tab 45 are both connected to the first current collector 41, when the first pole tab 44 and the second pole tab 45 are connected to the power supply 200, the thermal conductive layer 430 transmits current from the first current collector 41 to the first heating layer 43, so that the first heating layer 43 generates heat when the power supply 200 is connected. Optionally, the thermal conductive layer 430 is a graphite layer, or a copper layer, or a silver layer, or a magnesium-aluminum alloy layer.

[0137] It is understandable that the present application protects an electrode sheet, and the structure of the electrode sheet refers to the first electrode sheet 4 in the embodiment of the present application, and will not be described in detail here. In addition to being applicable to the battery cell assembly 1 in the embodiment of the present application, the electrode sheet can also be applied to other electronic devices, and the electronic device can use the electrode sheet to energize and also use the electrode sheet to generate heat, and the electrode sheet generates heat evenly. For example, the electronic device is an electrotherapy massage sheet or a hot compress electromagnetic sheet used in wearable devices.

[0138] The stacked structure of the first current collector 41 and the first heating layer 43 of the first electrode sheet 4 in the embodiment of the present application can be understood as a composite current collector structure, or as an assembly structure of a current collector and a heating layer.

[0139] Further, in Fig. 9 In the example shown, see Fig. 20 The control unit 93 is provided with a first switch unit 931 , one end of the first switch unit is connected to the second conductive end 92 , one end is connected to the first heating layer 43 , and another end is connected to the second current collector 51 .

[0140] Optionally, the first switch unit 931 is a single-pole double-throw analog switch to reduce the number of components of the battery assembly 10, save costs and reduce volume. The first switch unit 931 and the protection circuit 3 can be arranged on the same circuit board to improve the component concentration of the battery assembly 10 and improve the utilization rate of the circuit board.

[0141] Specifically, the first switch unit 931 has a first end 9311, a second end 9312 and a third end 9313, and the first end 9311 of the first switch unit 931 is connected to the second conductive end 92. The second end 9312 of the first switch unit 931 is connected to the second pole lug 45. The third end 9313 of the first switch unit 931 is connected to the third pole lug 54. The first switch unit 931 is used to receive a first control signal and conduct the second conductive end 92 and the third pole lug 54 under the action of the first control signal; or, the first switch unit 931 is used to receive a second control signal and conduct the second conductive end 92 and the second pole lug 45 under the action of the second control signal.

[0142] When the first end 9311 of the first switch unit 931 is connected to the second end 9312, and the first end 9311 of the first switch unit 931 is disconnected from the third end 9313, the second conductive end 92 is connected to the second pole ear 45, and the second conductive end 92 is disconnected from the third pole ear 54. At this time, a charging path is formed between the first conductive end 91, the first pole ear 44, the first heating layer 43, the second pole ear 45 and the second conductive end 92. In other words, the first heating layer 43 is connected to the positive and negative electrodes of the power source 200, and the first heating layer 43 generates Joule heat when current flows through. At this time, the battery assembly 10 enters the self-heating mode.

[0143] When the first end 9311 of the first switch unit 931 is disconnected from the second end 9312, and the first end 9311 of the first switch unit 931 is connected to the third end, the second conductive end 92 is connected to the first pole ear 44, and the second conductive end 92 is disconnected from the third pole ear 54. At this time, a charging path is formed between the first conductive end 91, the first pole ear 44, the first electrode sheet 4, the second electrode sheet 5, the third pole ear 54 and the second conductive end 92. The first electrode sheet 4 and the second electrode sheet 5 are electrically connected to the positive electrode and the negative electrode of the power source 200 respectively, and a potential difference is generated between the first electrode sheet 4 and the second electrode sheet 5. Lithium ions move between the first electrode sheet 4 and the second electrode sheet 5 under the action of the potential difference, thereby realizing the charging of the battery assembly 10. At this time, the battery assembly 10 enters the charging mode.

[0144] In the first scenario, at a temperature lower than the normal charging temperature of the battery cell assembly 1 (for example, lower than 10°C), the battery cell assembly 1 is affected by the low temperature and the internal reaction speed decreases, which cannot achieve fast charging, thereby affecting the normal operation of the battery. Therefore, by making the first switch unit 931 conduct the second conductive end 92 and the second pole ear 45 and disconnect the second conductive end 92 and the third pole ear 54, so that the first heating layer 43 is electrically connected to the positive and negative electrodes of the power source 200, the first heating layer 43 generates Joule heat, so that heat is generated inside the battery cell, which can quickly increase the temperature inside the battery cell, thereby increasing the reaction speed inside the battery cell assembly 1 and the charging rate of the battery.

[0145] In the second scenario, at the normal charging temperature of the battery cell assembly 1, before charging, the first switch unit 931 is turned on the second conductive end 92 and the second pole ear 45 and the second conductive end 92 and the third pole ear 54 are turned off, so that the first heating layer 43 is electrically connected to the positive and negative electrodes of the power source 200. In this way, heat is generated inside the battery cell, which can effectively increase the charging rate. For example, the normal fast charging rate of the battery cell is 1.5C (used to indicate the battery charging and discharging capacity rate), and the charging rate starts at 3C fast charging mode after heating to 50°C.

[0146] In other words, when the charging circuit 60 receives a charging instruction, before the battery cell assembly 1 enters the charging stage, the battery cell assembly 1 is controlled to enter the self-heating mode. In this way, the reaction speed inside the battery cell assembly 1 can be awakened at low temperatures, and the reaction speed inside the battery cell assembly 1 can be increased at normal charging temperature, both of which can greatly improve the charging rate of the battery cell assembly 1.

[0147] The battery cell assembly 1 provided in the embodiment of the present application is provided with a first heating layer 43 on the first current collector 41 of the first electrode sheet 4, and the first switch unit 931 is used to select the second pole ear 45 and the second conductive end 92 or the third pole ear 54 and the second conductive end 92, so that the battery cell assembly 1 can be switched to the self-heating mode or the charging mode. Before the battery cell assembly 1 enters the charging mode, the battery cell assembly 1 is controlled to enter the self-heating mode, which can effectively solve 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), and can also further improve the charging rate at non-low temperature; in this way, the present application not only effectively solves the problem of low charging rate or failure to charge normally at low temperature, but also effectively breaks through the rated charging rate designed for the battery cell assembly 1, and greatly improves the charging speed of the battery cell assembly 1, while the structural change of the battery cell assembly 1 is minimal and the increase in the volume of the battery cell assembly 1 is minimal.

[0148] See also Fig.21 , in another embodiment, with Fig. 20 The illustrated embodiments are substantially the same, except that the control unit 93 includes a first switch 9301 and a second switch 9302. One end of the first switch 9301 is used to connect the second conductive end 92. The other end of the first switch 9301 is connected to the second pole ear 45. Optionally, the first switch 9301 may be a triode switch or a field effect transistor switch.

[0149] One end of the second switch 9302 is used to connect the second conductive end 92. The other end of the second switch 9302 is connected to the third pole ear 54. Optionally, the second switch 9302 can be a triode switch or a field effect transistor switch. Optionally, the first switch 9301, the second switch 9302 and the protection circuit 3 are arranged on the same circuit board, so that the components of the battery assembly 10 are centrally arranged.

[0150] By making the first switch 9301 and the second switch 9302 independent of each other, the conduction between the second electrode tab 45 and the second conductive end 92 and the conduction between the third electrode tab 54 and the second conductive end 92 are controlled respectively, thereby improving the selection accuracy and reducing the selection error.

[0151] In this embodiment, the control unit 93 and the protection circuit 3 can be arranged on the same circuit board, so that the components of the battery assembly 10 are centrally arranged, which is convenient for component molding and space saving. The control unit 93 is an integrated chip. The control unit 93 is provided with a control circuit 930, which is used to select the second conductive end 92 and the second pole ear 45 or the second conductive end 92 and the third pole ear 54 according to the control signal received by the control unit 93.

[0152] exist Fig.21In the illustrated embodiment, the control circuit 930 is used to control the first switch unit 931 to switch on the second conductive end 92 and the second pole lug 45 or to switch on the second conductive end 92 and the third pole lug 54. After the control unit 93 receives the first control signal, the control circuit 930 controls the first switch unit 931 to switch on the second conductive end 92 and the third pole lug 54 according to the first control signal, and the battery cell assembly 1 enters the charging mode. The control circuit 930 controls the first switch unit 931 to switch on the second conductive end 92 and the second pole lug 45 according to the second control signal, and the battery cell assembly 1 enters the self-heating mode.

[0153] The control unit 93 connects the first switch 9301 and the second switch 9302. Fig.21 As shown, the control unit 93 receives the first control signal, and the control circuit 930 is used to control the first switch 9301 to be disconnected and the second switch 9302 to be turned on according to the first control signal, and at this time, the battery cell assembly 1 enters the charging mode. Fig. 22 As shown, the control unit 93 receives the second control signal, and the control circuit 930 is used to control the first switch 9301 to be turned on and the second switch 9302 to be turned off according to the second control signal. At this time, the battery cell assembly 1 enters the self-heating mode.

[0154] For example, the first switch 9301 and the second switch 9302 are both triodes. The first switch 9301 and the second switch 9302 are of different types. For example, the first switch 9301 is an N-type triode, and the second switch 9302 is a P-type triode. Alternatively, the first switch 9301 is a P-type triode, and the second switch 9302 is an N-type triode. In this embodiment, the first switch 9301 includes an emitter, a base, and a collector. The base of the first switch 9301 is connected to the control circuit 930, the emitter of the first switch 9301 is connected to the second conductive end 92, and the collector of the first switch 9301 is connected to the second pole ear 45. The second switch 9302 includes an emitter, a base, and a collector. The base of the second switch 9302 is connected to the control circuit 930, the collector of the second switch 9302 is connected to the second conductive end 92, and the emitter of the second switch 9302 is connected to the third pole ear 54.

[0155] It is understandable that if Fig. 22As shown, when the control unit 93 receives the first control signal, the control circuit 930 generates a high-level signal and sends the high-level signal to the base of the first switch 9301 and the base of the second switch 9302. The high-level signal disconnects the emitter and collector of the first switch 9301, and connects the emitter and collector of the second switch 9302. At this time, the battery assembly 10 enters the charging mode. The first control signal is a signal received by the processor of the electronic device 100 when the battery assembly 10 meets the charging condition after the battery assembly 10 is connected to the conductive end of the power source 200. The battery assembly 10 meets the charging condition when the ambient temperature of the battery assembly 10 meets the charging safety requirements of the battery assembly 10.

[0156] like Fig.23 As shown, when the control unit 93 receives the second control signal, the control circuit 930 generates a low-level signal and sends the low-level signal to the base of the first switch 9301 and the base of the second switch 9302. The low-level signal disconnects the emitter and collector of the second switch 9302, and connects the emitter and collector of the first switch 9301. At this time, the battery assembly 10 enters the self-heating mode. The second control signal is a signal received by the processor of the electronic device 100 when the battery assembly 10 does not meet the charging condition after the battery assembly 10 is connected to the conductive end of the power supply 200. The battery assembly 10 does not meet the charging condition when the ambient temperature of the battery assembly 10 does not meet the charging safety requirements of the battery assembly 10.

[0157] For further information, see Fig.24 , the battery cell assembly 1 further includes a temperature sensor 80. The temperature sensor 80 is connected to the control unit 93. The temperature sensor 80 is used to send a first control signal to the control unit 93 when the temperature of the battery cell assembly 1 is detected to be at a first preset temperature threshold, and to send a second control signal to the control unit 93 when the temperature of the battery cell assembly 1 is detected to be at a first preset temperature threshold.

[0158] Optionally, the temperature sensor 80 is disposed on the main board of the electronic device 100 and is close to the location of the battery cell assembly 1. The control unit 93 controls the first switch 9301 to be disconnected and the second switch 9302 to be connected according to the first control signal.

[0159] The first preset temperature threshold is the temperature that ensures the charging rate of the battery cell assembly 1. Generally, when the ambient temperature is too low, the capacity of the battery cell assembly 1 decreases and the voltage drops. In particular, during continuous charging, lithium ions are easily deposited at the negative electrode to form a polarization voltage, which causes the battery cell assembly 1 to lose its electrical activity, resulting in less electricity being charged into the battery cell assembly 1 in a low temperature environment. Therefore, the battery cell assembly 1 is in a normal charging state and the charging rate is not affected under the preset temperature threshold environment. Optionally, the first preset temperature threshold is greater than X and less than Y, X is in the range of 10°C to 12°C, and Y is in the range of 55°C to 80°C.

[0160] When the temperature sensor 80 detects that the temperature of the battery cell assembly 1 meets the first preset threshold, the temperature sensor 80 sends a first control signal to the control unit 93 via the processor of the electronic device 100, that is, the processor of the electronic device 100 sends the first control signal to the control unit 93. The control unit 93 controls the first switch 9301 to be disconnected and the second switch 9302 to be turned on according to the first control signal, so that the battery cell assembly 1 enters the charging mode, thereby allowing the battery cell assembly 1 to be charged normally.

[0161] When the temperature sensor 80 detects that the temperature of the battery cell assembly 1 meets the second preset temperature threshold, it sends a second control signal to the control unit 93. The second preset temperature threshold is less than or equal to X.

[0162] The control unit 93 is used to control the first switch 9301 to be turned on and the second switch 9302 to be turned off according to the second control signal, so that the first heating layer 43 of the first electrode sheet 4 starts to heat up, thereby making the battery cell assembly 1 in a self-heating mode, and the temperature of the battery cell assembly 1 starts to rise, so that after the temperature of the battery cell assembly 1 rises to a first preset temperature threshold, the battery cell assembly 1 can ensure charging safety and charging rate, and then the second switch 9302 is turned off and the first switch 9301 is turned on to start a normal charging mode (or fast charging mode).

[0163] The temperature sensor 80 is also used to detect that the temperature of the battery cell assembly 1 is at the third preset temperature threshold, and send a stop heating signal to the control unit 93. The control unit 93 controls the first switch 9301 to disconnect according to the stop heating signal, so that the battery cell assembly 1 stops self-heating. The third preset temperature is greater than or equal to Y, and Y is the high temperature critical temperature that affects the charging performance of the battery cell assembly 1. For example, the value of Y is 60°C. When the temperature sensor 80 detects that the temperature of the battery cell assembly 1 is greater than or equal to 60°C, the temperature sensor 80 sends a stop heating signal to the control unit 93. The control unit 93 controls the first switch 9301 to disconnect according to the stop heating signal, so that the battery cell assembly 1 enters the stop heating mode. In this embodiment, since the temperature of the battery cell assembly 1 has risen to 60°C before the charging mode, the problem of low charging efficiency at low temperatures is effectively solved, and the charging rate of the battery cell assembly 1 can also be made higher.

[0164] Optionally, the battery cell assembly 1 further includes a charging detection unit 110. Optionally, the charging detection unit 110 and the protection circuit 3 may be disposed on the same circuit board, or the charging detection unit 110 may be disposed on the main board of the electronic device 100.

[0165] The charging detection unit 110 is connected to the control unit 93. The charging detection unit 110 is used to detect the connection state between the battery cell assembly 1 and the power source 200, and send a connection instruction to the control unit 93 when the battery cell assembly 1 and the power source 200 are connected. The control unit 93 controls the first switch 9301 to be disconnected and the second switch 9302 to be turned on according to the connection instruction and the first control signal, so that the battery cell assembly 1 enters the charging mode; the control unit 93 controls the first switch 9301 to be turned on and the second switch 9302 to be disconnected according to the connection instruction and the second control signal, so that the battery cell assembly 1 enters the self-heating mode.

[0166] In other words, when the battery cell assembly 1 is connected to the power supply 200, the charging detection unit 110 detects that the battery cell assembly 1 changes from a non-connected state to a connected state, and the charging detection unit 110 sends a connection instruction to the control unit 93, and the control unit 93 controls the battery cell assembly 1 to enter a heating or charging mode.

[0167] In this way, when the battery cell assembly 1 is already in the normal charging temperature range (or fast charging temperature range), that is, the control unit 93 receives the first control signal, the control unit 93 turns on the first switch 9301 and turns off the second switch 9302, allowing the current loop to heat the battery cell assembly 1, so that the temperature of the battery cell assembly 1 rises to a higher temperature range, and then turns on the second switch 9302 and turns off the first switch 9301 to enable a larger charging rate. For example, at room temperature, the normal fast charging rate of the battery cell assembly 1 is 1.5C, and after heating to 50°C, it starts a fast charging mode with a fast charging rate of 3C.

[0168] See also Fig.25 , is a curve diagram of the battery cell assembly 11 with a capacity of 5100mAh being charged at 0.7C at room temperature 25°C and charged at 1.5C after heating to 50°C. It can be seen from the figure that the full charge time at room temperature is 155min, while the charging time after heating is shortened to 88min, which shows that the charging speed of the battery can be greatly improved after heating.

[0169] For further information, see Fig.26 ,exist Fig.10 In the illustrated embodiment, the battery cell assembly 1 further includes a fourth pole tab 55 connected to the second current collector 51 and / or the second heating layer 53 , and the control unit 93 is further used to control the fourth pole tab 55 to be disconnected or connected to the first conductive end 91 .

[0170] In this embodiment, one end of the fourth pole ear 55 may be fixedly connected to the second current collector 51, or may be fixedly connected to the second heating layer 53, or may be fixedly connected to both the second current collector 51 and the second heating layer 53. The other end of the fourth pole ear 55 is electrically connected to the control unit 93, and the fourth pole ear 55 may be electrically connected to the control unit 93 via a conductive cable. The control unit 93 may control the third pole ear 54 to be connected to the second conductive end 92, and control the fourth pole ear 55 to be connected to the first conductive end 91, so that the third pole ear 54 and the fourth pole ear 55 cooperate to connect the second heating layer 53 to the power supply 200, so that the second heating layer 53 receives current for heating, and then the battery cell assembly 1 is in self-heating mode. The fourth pole ear 55 serves as an independent pole ear of the second electrode sheet 5, so that when the second electrode sheet 5 needs to be connected to current for heating, it forms a negative terminal and a positive terminal with the third pole ear 54 respectively.

[0171] Optionally, the material of the fourth pole tab 55 is the same as that of the second pole tab 45 , or the same as that of the first pole tab 44 .

[0172] Optionally, the fourth electrode tab 55 is welded to the second current collector 51 and / or the second heating layer 53 .

[0173] exist Fig.26 In the illustrated embodiment, the connection method of the fourth electrode tab 55 and the second electrode sheet 5 can refer to the connection method of the second electrode tab 45 and the first electrode sheet 4. In the embodiment of the present application, the number of the fourth electrode tabs 55 is not limited, and the connection method of the fourth electrode tab 55 and the second current collector 51 and / or the second heating layer 53 is not limited. The structure of the second electrode sheet 5 provided with the second current collector 51 and the second heating layer 53 is similar to the structure of the first electrode sheet 4 provided with the first current collector 41 and the first heating layer 43, and will not be repeated here.

[0174] For further information, see Fig. 27 ,exist Fig.26 In the illustrated embodiment, the control unit 93 includes a second switch unit 932. One end of the second switch unit 932 is used to connect the first conductive end 91. The other two ends of the second switch unit 932 are respectively connected to the first pole lug 44 and the fourth pole lug 55. The second switch unit 932 is used to receive a control signal and conduct the first conductive end 91 and the first pole lug 44 under the action of the control signal; or, the second switch unit 932 is used to receive a control signal and conduct the first conductive end 91 and the fourth pole lug 55 under the action of the control signal.

[0175] One end of the second switch unit 932 is connected to the protection circuit 3. The second switch unit 932 is connected to the first output terminal 210 of the power supply 200 via the protection circuit 3. Further, the second switch unit 932 and the protection circuit 3 can be arranged on the same circuit board to improve the device concentration of the battery assembly 10 and improve the utilization rate of the circuit board.

[0176] See also Fig. 27 , the other two ends of the second switch unit 932 are respectively connected to the first pole lug 44 and the fourth pole lug 55. The second switch unit 932 is used to receive a control signal and, under the action of the control signal, conduct the first conductive end 91 with the first pole lug 44 or conduct the first conductive end 91 with the fourth pole lug 55. Optionally, the second switch unit 932 can be a single-pole double-throw analog switch to reduce the number of components of the battery cell assembly 1, save costs and reduce volume.

[0177] See also Fig.28 ,and Fig. 27The illustrated embodiments are substantially the same, except that the control unit 93 includes a third switch 9303 and a fourth switch 9304. One end of the third switch 9303 and one end of the fourth switch 9304 are both used to connect to the first conductive end 91. The other end of the third switch 9303 is connected to the first pole ear 44. The other end of the fourth switch 9304 is connected to the fourth pole ear 55. Optionally, the third switch 9303 can be a triode switch or a field effect transistor switch. Optionally, the fourth switch 9304 can be a triode switch or a field effect transistor switch. Optionally, the third switch 9303, the fourth switch 9304 and the protection circuit 3 are arranged on the same circuit board so that the components are centrally arranged.

[0178] By making the third switch 9303 and the fourth switch 9304 independent of each other, the conduction between the first electrode tab 44 and the first conductive end 91 and the conduction between the fourth electrode tab 55 and the first conductive end 91 are controlled respectively, thereby improving the selection accuracy and reducing the selection error.

[0179] See also Fig.29 , the third switch 9303 and the fourth switch 9304 are both connected to the control unit 93. The second control signal is used to instruct the control unit 93 to control the third switch 9303 to be turned on and the fourth switch 9304 to be turned off, and to control the first switch 9301 to be turned on and the second switch 9302 to be turned off, so that the first conductive end 91 is connected to the first pole ear 44, and the second conductive end 92 is connected to the second pole ear 45. At this time, the first heating layer 43 of the first electrode sheet 4 is connected to the current of the power supply 200 through the first conductive end 91 and the second conductive end 92 to generate heat, so that the battery cell assembly 1 enters the self-heating mode.

[0180] See also Fig.30 The third control signal is used to instruct the control unit 93 to control the third switch 9303 to be disconnected and the fourth switch 9304 to be turned on, and to control the first switch 9301 to be disconnected and the second switch 9302 to be turned on, so that the first conductive end 91 is connected to the fourth pole ear 55, and the second conductive end 92 is connected to the third pole ear 54. At this time, the second heating layer 53 of the second electrode sheet 5 is connected to the current of the power supply 200 through the first conductive end 91 and the second conductive end 92 to generate heat, so that the battery cell assembly 1 enters the self-heating mode.

[0181] Optionally, the third switch 9303 and the fourth switch 9304 are both triodes. The connection method of the third switch 9303 with the first conductive end 91, the control unit 93, and the third pole ear 54 can refer to the connection method of the first switch 9301 with the second conductive end 92, the control unit 93, and the second pole ear 45, which will not be repeated here. Similarly, the connection method of the fourth switch 9304 with the first conductive end 91, the control unit 93, and the fourth pole ear 55 can refer to the connection method of the second switch 9302 with the second conductive end 92, the control unit 93, and the third pole ear 54, which will not be repeated here.

[0182] In the embodiment of the present application, by adding tabs and switches, the first heating layer 43 of the first electrode sheet 4 and the second heating layer 53 of the second electrode sheet 5 can both be independently self-heated. Among them, controlling the self-heating of the first heating layer 43 of the first electrode sheet 4 and the second heating layer 53 of the second electrode sheet 5 includes but is not limited to the following implementations.

[0183] See also Fig.29 In the first heating stage, the control unit 93 controls the first switch 9301 to be turned on, the second switch 9302 to be turned off, the third switch 9303 to be turned on, and the fourth switch 9304 to be turned off. At this time, the first heating layer 43 of the first electrode sheet 4 can be connected to the power supply 200 through the first conductive end 91 and the second conductive end 92 for self-heating.

[0184] See also Fig.30 In the second heating stage, the control unit 93 controls the first switch 9301 to be turned off, the second switch 9302 to be turned on, the third switch 9303 to be turned off, and the fourth switch 9304 to be turned on. At this time, the second heating layer 53 of the second electrode sheet 5 can be connected to the power supply 200 through the first conductive end 91 and the second conductive end 92 for self-heating. There is a time interval between the first heating stage and the second heating stage. Further, the first heating layer 43 of the first electrode sheet 4 and the second heating layer 53 of the second electrode sheet 5 can be alternately controlled to self-heat.

[0185] In other words, time-sharing control of the self-heating of the first electrode sheet 4 and the second electrode sheet 5 can improve the uniformity of the heating of the battery cell assembly 1 on the one hand, and balance the use frequency of the first electrode sheet 4 and the second electrode sheet 5 on the other hand, thereby improving the stability of the battery.

[0186] The present application does not make any specific limitation on the specific structure of the first electrode sheet 4 and the second electrode sheet 5. The present application illustrates the structure of the first electrode sheet 4 and the second electrode sheet 5 through the following examples. Of course, the structure of the first electrode sheet 4 and the second electrode sheet 5 provided by the present application includes but is not limited to the following implementation methods.

[0187] Optional, see Fig.31 The first electrode sheet 4 and the second electrode sheet 5 are both roughly in the shape of rectangular plates. The first electrode sheet 4 includes two long sides 401 arranged opposite to each other, and two short sides 402 connected between the two long sides 401. The length of each long side 401 is greater than or equal to the length of each short side 402.

[0188] In a first possible implementation, see Fig.30 The first electrode tab 44 and the second electrode tab 45 are respectively located on the two short sides 402 .

[0189] Furthermore, the first pole ear 44 and the second pole ear 45 are arranged approximately diagonally, so that the conductive path between the first pole ear 44 and the second pole ear 45 can be increased, thereby increasing the internal resistance value of the current passing through the second heating layer 53, thereby increasing the heat generation of the first heating layer 43 and improving the heating efficiency of the battery cell assembly 1.

[0190] In a second possible implementation, see Fig.32 , the first pole lug 44 and the second pole lug 45 are respectively arranged on the two long sides 401. Further, the first pole lug 44 and the second pole lug 45 are arranged approximately diagonally, similar to the previous embodiment, so that the conductive path between the first pole lug 44 and the second pole lug 45 can be increased, thereby increasing the internal resistance value of the current passing through the first heating layer 43, thereby increasing the heat generation of the second heating layer 53, and improving the heating efficiency of the battery cell assembly 1.

[0191] In a third possible implementation, see Fig.33 The first pole tab 44 and the second pole tab 45 are located on a long side 401 and are close to the two short sides 402 respectively.

[0192] Compared with the above two embodiments, this embodiment realizes that the first pole ear 44 and the second pole ear 45 are arranged on the same side, so that the lead wire connected to the first pole ear 44 and the lead wire connected to the second pole ear 45 can be led out from the long side 401 to avoid cluttered leads. At the same time, placing the first pole ear 44 and the second pole ear 45 close to the two short sides 402 respectively can effectively increase the conductive path between the first pole ear 44 and the second pole ear 45, thereby increasing the heat generation of the first heating layer 43 and improving the heating efficiency of the battery cell assembly 1.

[0193] In a fourth possible implementation, see Fig.34 The first electrode tab 44 and the second electrode tab 45 are located on a short side 402 and are close to the two long sides 401 respectively.

[0194] This embodiment is similar to the third embodiment in that the first pole ear 44 and the second pole ear 45 are arranged on the same side, so that the lead wire connected to the first pole ear 44 and the lead wire connected to the second pole ear 45 can be led out from the short side 402 to avoid cluttered leads. At the same time, placing the first pole ear 44 and the second pole ear 45 close to the two long sides 401 respectively can effectively increase the conductive path between the second pole ear 45 and the third pole ear 54, thereby increasing the heat generated by the second heating layer 53 and improving the heating efficiency of the battery cell assembly 1.

[0195] The above is an implementation of the first electrode tab 44 and the second electrode tab 45 being disposed on the first electrode sheet 4 . The implementation of the third electrode tab 54 and the fourth electrode tab 55 being disposed on the first electrode sheet 4 may refer to the above implementation, and will not be described in detail here.

[0196] The embodiment of the present application does not specifically describe the structural form of the battery cell assembly 1. The battery cell assembly 1 provided in the present application includes but is not limited to the following implementation methods.

[0197] In one possible implementation, see Fig.35 , this embodiment provides a wound cell structure. The cell assembly 1 also includes a diaphragm 7 stacked between the first electrode sheet 4 and the second electrode sheet 5. The first electrode sheet 4, the diaphragm 7 and the second electrode sheet 5 are wound together to form the cell assembly 1. The first electrode sheet 4, the second electrode sheet 5 and the diaphragm 7 are wound and packaged in the packaging layer 8. The long side 401 of the first electrode sheet 4 is the winding side. The first pole ear 44 and the second pole ear 45 are located on a long side 401 and are respectively close to the two short sides 402. Further, the first pole ear 44 and the second pole ear 45 can be close to the seal of the packaging layer 8. The third pole ear 54 and the fourth pole ear 55 are located at the winding side of the second electrode sheet 5 and are close to the seal of the packaging layer 8. In this way, the first pole ear 44, the second pole ear 45, the third pole ear 54 and the fourth pole ear 55 can be connected to the protection circuit 3 through a shorter electrical connection line, reducing the line length inside the cell assembly 1.

[0198] See also Fig.36 In another possible implementation, this embodiment provides a laminated cell structure. The cell assembly 1 is provided with a plurality of first electrode sheets 4, a plurality of first pole tabs 44 and at least one second pole tab 45. The plurality of first electrode sheets 4 are stacked on each other and arranged at intervals. Each first pole tab 44 is connected to each first electrode sheet 4. The plurality of first pole tabs 44 are connected in parallel to form the positive pole tab of the cell assembly 1.

[0199] See also Fig.36 The battery cell assembly 1 is provided with a plurality of second electrode sheets 5 and a plurality of third pole tabs 54. Each second electrode sheet 5 is provided between two adjacent first electrode sheets 4. The battery cell assembly 1 further includes a plurality of diaphragms 7, with a diaphragm 7 provided between each adjacent first electrode sheet 4 and second electrode sheet 5. Each third pole tab 54 is connected to each second electrode sheet 5 in parallel to form the negative pole tab of the battery cell assembly 1. Optional, please refer to Fig.36, the number of the second pole tabs 45 is multiple. The multiple second pole tabs 45 are connected in parallel. In combination with the above embodiment, the multiple second pole tabs 45 are connected in parallel to the second conductive end 92 through the first switch 9301, and the multiple first pole tabs 44 are connected in parallel to the first conductive end 91 through the third switch 9303. When the control unit 93 controls the first switch 9301 to be turned on, the second switch 9302 to be turned off, the third switch 9303 to be turned on, and the fourth switch 9304 to be turned off, the first heating layers 43 of the multiple first electrode sheets 4 are connected to the current and generate heat to increase the temperature of the battery cell assembly 1.

[0200] Optional, see Fig.37 , the number of the second pole ear 45 is one. One second pole ear 45 is provided on any one of the plurality of first electrode sheets 4. In other words, one of the first electrode sheets 4 is provided with a first pole ear 44 and a second pole ear 45. The control unit 93 controls the first switch 9301 to be turned on, the second switch 9302 to be turned off, the third switch 9303 to be turned on, and the fourth switch 9304 to be turned off, and the current flows through the first heating layer 43 of one of the first electrode sheets 4, and the first heating layer 43 of the first electrode sheet 4 is heated. Compared with the heating of the plurality of first pole sheets, the first electrode sheet 4 provided in this embodiment is a single-piece heating, and the internal resistance of the single electrode sheet is greater than the internal resistance of the sub-electrode sheet of the plurality of first electrode sheets 4 connected in parallel, so that the heat generated by the single sub-electrode sheet is greater than the heat generated by the electrode sheet of the plurality of first electrode sheets 4 connected in parallel, thereby achieving faster temperature rise.

[0201] Optional, see Fig.38 , the number of the second pole lugs 45 is multiple. The first switch 9301 includes multiple sub-switches 9300. Each sub-switch 9300 is connected to a second pole lug 45 and a second conductive end 92. The sub-switch 9300 is used to receive a control signal and is turned on or off under the action of the control signal. By controlling the on and off of multiple sub-switches 9300, the number of first electrode sheets 4 connected between the first conductive end 91 and the second conductive end 92 when the battery cell assembly 1 is self-heated can be controlled, thereby controlling the internal resistance of the self-heating of the battery cell assembly 1 and adjusting the heating rate of the self-heating of the battery cell assembly 1.

[0202] See also Fig.39 In another embodiment, with Fig.36The illustrated embodiments are substantially the same, except that a fifth switch 9305 is provided in two adjacent first electrode sheets 4, one end of the fifth switch 9305 is connected to the second pole ear 45 of one of the first electrode sheets 4, and the other end is connected to the first pole ear 44 of the other electrode sheet. The fifth switch 9305 is used to control the first pole ear 44 and the second pole ear 45 of the two adjacent first electrode sheets 4 to be connected, and the fifth switch 9305 is also connected to the control circuit 930 to receive the control signal of the control circuit 930. When the control unit 93 receives the control signal, so that the fifth switches 9305 between the plurality of first electrode sheets 4 are all connected to the adjacent first pole ear 44 and the second pole ear 45, so that the plurality of first electrode sheets 4 are connected in series, the first pole ear 44 of the first electrode sheet 4 at the head end is connected to the first conductive end 91 through the third switch 9303 through the control unit 93, and the second pole ear 45 of the first electrode sheet 4 at the end is connected to the second conductive end 92 through the first switch 9301, so that the first heating layers 43 of the plurality of first electrode sheets 4 are connected in series in sequence and then connected to the first conductive end 91 and the second conductive end 92.

[0203] In this way, the first heating layers 43 of the multiple first electrode sheets 4 are connected in series to generate heat. Compared with the heating of one first heating layer 43 or multiple first heating layers 43 connected in parallel, the multiple first heating layers 43 provided in series in this embodiment have a larger internal resistance, so that the self-heating efficiency of the battery cell assembly 1 is higher and the temperature rises faster.

[0204] The above is a structural improvement for connecting the first heating layer 43 of the first electrode sheet 4 to the power supply 200 via the first conductive end 91 and the second conductive end 92. The structural improvement for connecting the second heating layer 53 of the second electrode sheet 5 to the power supply 200 via the first conductive end 91 and the second conductive end 92 can refer to the structural improvement of the first heating layer 43 of the first electrode sheet 4, which will not be repeated here.

[0205] The battery cell assembly 1 further includes a heating element. The heating element is connected between the second pole tab 45 and the first switch unit 931. The heating element can be made of a material with a good heating effect when powered on, such as a metal heating wire, graphene, a positive temperature coefficient thermistor (PTC), and the like.

[0206] By adding a heating element, when the control unit 93 controls the self-heating of the first heating layer 43 of the first electrode sheet 4, the heating element is energized. In this way, the heating element and the first heating layer 43 of the second electrode sheet 5 can be connected in series to generate heat, thereby further improving the heating rate of the battery cell assembly 1 and accelerating the time it takes to fully charge the battery.

[0207] Optionally, the number of the battery cell components 1 in the electronic device 100 provided in the present application may be one or more. When the number of the battery cell components 1 is multiple, the electronic device 100 may include a first battery cell component 1 and a second battery cell component 1, and the first battery cell component 1 and the second battery cell component 1 may be charged mutually or independently from an external power source 200.

[0208] The charging method of the battery cell assembly 1 provided in the embodiment of the present application includes but is not limited to the following implementation methods.

[0209] For the first optional implementation, please refer to Fig.40 , the electronic device 100 includes a first battery cell assembly 101 and a second battery cell assembly 102. The positive electrode tab of the first battery cell assembly 101 is connected to the positive electrode tab of the second battery cell assembly 1 through a switch. The negative electrode tab of the first battery cell assembly 101 is connected to the negative electrode tab of the second battery cell assembly 1 through a switch. The first battery cell assembly 101 and the second battery cell assembly 102 can work simultaneously or in time-sharing. Among them, when the temperature of the first battery cell assembly 101 is too low, the second battery cell assembly 102 can charge the first battery cell assembly 101. Similarly, when the temperature of the second battery cell assembly 102 is too low, the first battery cell assembly 101 can charge the second battery cell assembly 102. 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 temperature of the first battery cell assembly 101 and the second battery cell assembly 102 can be raised to above the normal charging temperature, effectively solving the problem that the electronic device 100 cannot be charged normally at a temperature lower than the normal charging temperature.

[0210] It can be understood that the description of any embodiment of the structure of the battery cell assembly 1 can be combined with the present embodiment. When the first battery cell assembly 101 needs to be charged, the positive pole of the second battery cell assembly 102 is equivalent to the second output terminal 220 of the power supply 200 in the above embodiment, and the negative pole of the second battery cell assembly 102 is equivalent to the first output terminal 210 of the power supply 200 in the above embodiment. In this way, the second battery cell assembly 102 can charge the first battery cell assembly 101.

[0211] Of course, this embodiment does not specifically limit the number of the battery cell assemblies 1.

[0212] In this embodiment, a plurality of the battery cell assemblies 1 are provided, and the plurality of the battery cell assemblies 1 can be charged mutually, so that the battery cell assemblies 1 can be charged without an external power source 200, thereby improving the discharge performance of the battery cell assemblies 1 at low temperatures.

[0213] In a second optional embodiment, the battery cell assembly 1 can be electrically connected to an external power source 200 via an electrical connection line. This embodiment can refer to the specific description of the battery cell assembly 1 above, which will not be described again here.

[0214] For a third optional implementation, please refer to Fig.41 The battery cell assembly 1 can also be charged by an external wireless charger through wireless charging.

[0215] Specifically, the electronic device 100 may include a wireless charging coil. The description of any one of the embodiments of the structure of the battery cell assembly 1 may be combined with this embodiment, wherein one end of the wireless charging coil may be equivalent to the first output end 210 of the power supply 200 in the above embodiment, and the other end of the wireless charging coil may be equivalent to the second output end 220 of the power supply 200 in the above embodiment, so as to realize charging of the battery cell assembly 1.

[0216] The embodiment of the present application is described by taking the manner in which the battery cell assembly 1 is electrically connected to the external power source 200 via an electrical connection line as an example. Those skilled in the art may apply the inventive concept of the present application to the application scenario in which the battery cell assembly 1 is wirelessly charged or the battery cell assemblies 1 are charged with each other.

[0217] It should be noted that the connection between the circuit of the electronic device and the electronic device, and the connection between the electronic device and the electronic device in this application can be conducted when powered on, that is, an electrical connection relationship. The circuit of the electronic device includes a charging circuit 60, a protection circuit 3, etc. The electronic device of the electronic device 100 includes a charging interface 50, the battery assembly 10, a charging terminal, an electrode, a current collector, a positive electrode material, a negative electrode material, a switch unit and a switch, etc.

[0218] The electronic device 10 may be a computing device such as a laptop computer, a computer monitor including an embedded computer, a tablet computer, a cellular phone, a media player, or other handheld or portable electronic device, a smaller device (such as a wristwatch device, a pendant device, a headset or earpiece device, a device embedded in glasses or other devices worn on the user's head, or other wearable or miniature devices), a television, a computer display that does not include an embedded computer, a gaming computer, or a computer monitor.

[0219] A gaming device, a navigation device, an embedded system (such as a system in which an electronic device with a display is installed in an information kiosk or a car), a device that implements the functions of two or more of these devices, or other electronic devices. In an exemplary configuration of the present application, the electronic device is a portable device, such as a cellular phone, a media player, a tablet computer, or other portable device with a battery. It should be noted that Figure 1These examples are for illustrative purposes only.

[0220] The above are some implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A battery cell assembly, characterized in that: The battery core assembly comprises: A first electrode sheet, the first electrode sheet comprising a first current collector and a first heating layer in electrical communication with the first current collector, the first heating layer being used to receive current from a power source and generate heat; A second electrode sheet, disposed opposite to the first electrode sheet, wherein the second electrode sheet comprises a second current collector; A power input circuit, provided with a first conductive end and a second conductive end, and a control unit electrically connected to the first conductive end and the second conductive end, wherein the first conductive end and the second conductive end are used to be electrically connected to an input power source, and the control unit is also electrically connected to the first current collector, the second current collector, and the first heating layer; a temperature sensor connected to the control unit; When the temperature sensor detects that the temperature of the battery cell assembly meets a second preset temperature threshold, the control unit is used to control the first switch between the second conductive end and the first heating layer to be turned on and the second switch between the second conductive end and the second current collector to be turned off, and the battery cell assembly is in a self-heating mode; the second preset temperature threshold is less than or equal to 12°C; The temperature sensor is further used to detect that when the temperature of the battery cell assembly is at a third preset temperature threshold, the control unit is used to control the first switch to be disconnected, and the battery cell assembly stops the heating mode, and the third preset temperature threshold is greater than or equal to 55° C.; When the temperature sensor detects that the temperature of the battery cell assembly meets a first preset temperature threshold, the control unit controls the first switch to be disconnected and the second switch to be turned on, and the battery cell assembly enters a charging mode. The first preset temperature threshold is greater than 12°C and less than 55°C.

2. The battery cell assembly according to claim 1, characterized in that: The first electrode sheet is provided with two layers of the first current collector, and the first heating layer is provided between the two layers of the first current collector.

3. The battery cell assembly according to claim 2, characterized in that: Multiple layers of the first heating layers are arranged between the two layers of the first current collectors, and the multiple layers of the first heating layers are arranged at intervals, wherein part or all of the first heating layers receive current and generate heat.

4. The battery cell assembly according to claim 1, characterized in that: The first electrode sheet is provided with a layer of the first current collector and a layer of the first heating layer, and the first heating layer and the layer of the first current collector are stacked.

5. The battery cell assembly according to claim 1, characterized in that: The first electrode sheet is provided with a layer of the first current collector and a layer of the first heating layer, and the first heating layer is provided in the first current collector.

6. The battery cell assembly according to any one of claims 1 to 5, characterized in that: An active material layer is disposed on a surface of the first current collector facing away from the first heating layer.

7. The battery cell assembly according to claim 6, characterized in that: An orthographic projection of the active material layer on a side of the first heating layer facing the active material layer is located on the first heating layer.

8. The battery cell assembly according to any one of claims 1 to 5, characterized in that: The first heating layer is in contact with the first current collector.

9. The battery cell assembly according to any one of claims 1 to 5, characterized in that: The first heating layer and the first current collector are arranged at a distance, and a thermally conductive and electrically conductive layer is provided between the first heating layer and the first current collector. The thermally conductive and electrically conductive layer is used to transmit current from the first current collector to the first heating layer, or to transmit current from the first heating layer to the first current collector, and to evenly transfer the heat of the first heating layer to the first current collector.

10. The battery cell assembly according to any one of claims 1 to 5, characterized in that: The resistance of the first heating layer is greater than the resistance of the first current collector.

11. The battery cell assembly according to any one of claims 1 to 5, characterized in that: When the control unit receives a first control signal, the control unit connects the first conductive end to the first current collector, connects the second conductive end to the second current collector, and disconnects the first heating layer; When the control unit receives the second control signal, the control unit connects the first conductive end to the first current collector, connects the second conductive end to the first heating layer, and disconnects the second conductive end from the second current collector.

12. The battery cell assembly according to claim 11, characterized in that: The second electrode sheet is provided with a second heating layer which is in electrical communication with the second current collector; The control unit is also electrically connected to the second heating layer; When the control unit receives the third control signal, the control unit connects the first conductive end to the second heating layer and disconnects it from the first current collector, and connects the second conductive end to the second current collector and disconnects it from the first heating layer.

13. The battery cell assembly according to claim 12, characterized in that: When the control unit receives a fourth control signal, the control unit connects the first conductive end to the first current collector and the second heating layer, and connects the second conductive end to the first heating layer and the second current collector.

14. The battery cell assembly according to claim 12, characterized in that: The battery cell assembly includes a first pole lug connected to the first current collector, and a second pole lug connected to the first current collector or / and the first heating layer; the battery cell assembly also includes a third pole lug connected to the second current collector, and the control unit electrically connects the first pole lug, the second pole lug and the third pole lug, and the control unit is used to control the first pole lug to be disconnected or connected with the first conductive end, and to control the second pole lug to be disconnected or connected with the second conductive end, and to control the second conductive end to be disconnected or connected with the third pole lug.

15. The battery cell assembly according to claim 14, characterized in that: The battery cell assembly further includes a fourth electrode tab connected to the second current collector and / or the second heating layer, and the control unit is further configured to control the fourth electrode tab to be disconnected from or connected to the first conductive end.

16. The battery cell assembly according to claim 15, characterized in that: The control unit is provided with four switches, one ends of the four switches are respectively connected to the first pole lug, the second pole lug, the third pole lug and the fourth pole lug, wherein the other ends of the two switches connected to the first pole lug and the fourth pole lug are both connected to the first conductive end, and the other ends of the two switches connected to the second pole lug and the third pole lug are both connected to the second conductive end.

17. The battery core assembly according to any one of claims 12 to 16, characterized in that: The battery cell assembly also includes a temperature sensor, which is connected to the control unit. The temperature sensor is used to detect the temperature of the battery cell assembly at a first preset temperature threshold and send a first control signal to the control unit, and to detect the temperature of the battery cell assembly at a second preset temperature threshold and send a second control signal to the control unit.

18. The battery core assembly according to any one of claims 12 to 16, characterized in that: The first electrode sheet is provided with a first active material layer on a surface of the first current collector facing away from the first heating layer.

19. The battery core assembly according to any one of claims 12 to 16, characterized in that: The second electrode sheet is provided with a second active material layer on a surface of the second current collector facing away from the second heating layer.

20. The battery core assembly according to any one of claims 12 to 16, characterized in that: The battery cell assembly further includes a separator disposed between the first electrode sheet and the second electrode sheet, and a packaging layer covering the first electrode sheet, the second electrode sheet and the separator.

21. The battery cell assembly according to claim 20, characterized in that: The first electrode sheet, the separator and the second electrode sheet are rolled together and packaged in the packaging layer, and the control unit is electrically connected to the rolled edge of the first electrode sheet and the rolled edge of the second electrode sheet.

22. The battery cell assembly according to claim 20, characterized in that: The battery cell assembly is provided with a plurality of the first electrode sheets, a plurality of the second electrode sheets and at least one the diaphragm. The plurality of the first electrode sheets and the plurality of the second electrode sheets are staggered and stacked with each other and then encapsulated in the encapsulation layer. Each of the diaphragms is arranged between adjacent first electrode sheets and second electrode sheets. When the control unit receives a control signal, the control unit controls the first current collectors of the plurality of the first electrode sheets to be connected in series or / and in parallel to the first conductive end, and controls the second current collectors of the plurality of the second electrode sheets to be connected in series or / and in parallel to the second conductive end.

23. A battery assembly, characterized in that: The battery assembly comprises a battery cell assembly as claimed in any one of claims 1 to 22.

24. An electronic device, characterized in that: Including the battery assembly as described in claim 23, the battery assembly is connected to the power source via an electrical connection line; or, the battery assembly is connected to the power source via wireless charging.

25. An electronic device, characterized in that: Including the battery assembly as described in claim 23, the battery assembly is a first battery assembly, and the electronic device also includes a second battery assembly, and the second battery assembly is the power source.

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