Battery protection board, battery module and electronic equipment

Abstract

The utility model provides a battery protection board, a battery module and electronic equipment. The battery protection board comprises a first protection circuit, a first daughter board and a second daughter board, the first protection circuit is arranged on the second daughter board, and the first protection circuit is electrically connected with the battery cell through the connecting line of the first daughter board. According to the embodiment, the first protection circuit is arranged on the second daughter board, and the first daughter board is only provided with the connecting wire, so that the size of the first daughter board can be reduced, the size of the battery cell is further reduced, and the capacity of the battery cell is improved; moreover, the first daughter board is electrically connected with the battery cell and the second daughter board is far away from the battery cell, so that heat dissipation of the battery cell and the first protection circuit is facilitated, and normal work of the battery cell and the battery protection board is ensured.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a battery protection board, a battery module and an electronic device. Background Art

[0002] The battery power of electronic devices is composed of a cell and a protection board. The tabs of the cell and the welding points of the protection board are welded together to provide protection for the cell.

[0003] The existing protection board is equipped with a power circuit, a protection unit, and a power detection unit. Taking the protection unit as an example, the protection unit of the existing protection board is equipped with two protection circuits, each with a different protection voltage threshold or current threshold, to meet the protection requirements of the battery in different usage scenarios.

[0004] In actual applications, when there is a need to increase battery capacity, the size of the battery cell will increase, which will reduce the size of the protection board and affect the heat dissipation of the protection board. Utility Model Content

[0005] The present disclosure provides a battery protection board, a battery module and an electronic device to solve the above technical problems.

[0006] According to a first aspect of the present disclosure, a battery protection board is provided, which includes a first protection circuit, a first sub-board, and a second sub-board; the first protection circuit is arranged on the second sub-board, and the first protection circuit is electrically connected to the battery cell through the connecting wire of the first sub-board.

[0007] Optionally, the second sub-board includes a first substrate having a multi-layer structure; the first protection circuit includes a protection switch device; and the protection switch device is embedded in the first substrate.

[0008] Optionally, the first protection circuit also includes at least one of a power meter module and a first protection chip module; the power meter module and / or the first protection chip module are arranged on the first side of the first substrate; and a connection end is provided on the second side of the first substrate, and the connection end is used to electrically connect to the first matching end of the first side of the first sub-board.

[0009] Optionally, the first sub-board includes a wiring layer and a substrate; the wiring layer is formed on the first side surface of the substrate, and the wiring layer is provided with connecting wires; the connecting wires are respectively connected to the first protection circuit and the battery cell.

[0010] Optionally, the first sub-board further includes a supporting layer, and the supporting layer is arranged on the second side surface of the substrate; the second side surface and the first side surface are two side surfaces of the substrate respectively.

[0011] Optionally, a first matching end is provided on the first side surface of the wiring layer, and the first matching end is used to be electrically connected to the connection end of the second sub-board.

[0012] Optionally, a power supply terminal is provided on the second side surface of the substrate, and the power supply terminal is used to be electrically connected to a power terminal of the battery cell.

[0013] Optionally, the battery protection board further includes a bending portion, which is used to fix the first sub-board and the second sub-board; and the angle between the first side surface of the first sub-board and the first side surface of the second sub-board is less than or equal to a first preset angle.

[0014] According to a second aspect of the present disclosure, a battery module is provided, comprising a battery cell and a battery protection board as described in any one of the first aspects; a preset side surface of the battery cell comprises a power terminal, and the power terminal is electrically connected to a connection end of a second side surface of a first sub-board in the battery protection board; and an angle between the second side surface and the preset side surface is less than or equal to a second preset angle.

[0015] Optionally, the connection terminal of the battery cell is a copper sheet arranged on a preset side surface, and the connection end of the second side surface is a copper sheet arranged on the second side surface.

[0016] According to a second aspect of the present disclosure, an electronic device is provided, comprising a mainboard and a battery module as described in the second aspect; the mainboard comprises a second protection circuit, which is electrically connected to the battery module; the second protection circuit and the first protection circuit of the battery module serve as a second-stage protection circuit of the battery module.

[0017] Optionally, the mainboard further includes a power management module and a communication interface; the power management module is electrically connected to the first protection circuit and the second protection circuit respectively, and the communication interface of the mainboard is electrically connected to the communication interface of the battery module;

[0018] The power management module is used to obtain the cell parameters of the battery module through the communication interface, and control the first protection circuit and / or the second protection circuit to switch to the disconnected state according to the cell parameters and the preset protection threshold to protect the battery.

[0019] The technical solutions provided by the embodiments of the present disclosure may have the following beneficial effects:

[0020] The battery protection board provided in this embodiment includes a first protection circuit, a first sub-board, and a second sub-board. The first protection circuit is disposed on the second sub-board and is electrically connected to the battery cells via the connecting wires of the first sub-board. Thus, by disposing the first protection circuit on the second sub-board and providing only the connecting wires on the first sub-board, this embodiment reduces the size of the first sub-board, thereby reducing the size of the battery cells and facilitating an increase in the battery cell capacity. Furthermore, the first sub-board is electrically connected to the battery cells, while the second sub-board is located away from the battery cells. This facilitates heat dissipation between the battery cells and the first protection circuit, ensuring proper operation of the battery cells and the battery protection board.

[0021] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a block diagram of a battery module according to an embodiment of the present disclosure.

[0023] Figure 2 This is a schematic diagram of a preset side surface of a battery cell according to an embodiment of the present disclosure.

[0024] Figure 3 This is a schematic diagram of a connection end of a first daughter board according to an embodiment of the present disclosure.

[0025] Figure 4 The figure is a side view of a battery protection board according to an embodiment of the present disclosure.

[0026] Figure 5 Schematic diagram of a battery protection board according to an embodiment of the present disclosure.

[0027] Figure 6 This is a schematic diagram of a second sub-board and a first protection circuit according to an embodiment of the present disclosure.

[0028] Figure 7 This is a structural diagram of a first sub-board according to an embodiment of the present disclosure.

[0029] Figure 8 This is a structural diagram of a first sub-board according to an embodiment of the present disclosure.

[0030] Figure 9 This is a block diagram of an electronic device according to an embodiment of the present disclosure.

[0031] Figure 10 This is a block diagram of an electronic device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0032] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present disclosure. Rather, they are merely examples of devices consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0033] To address the aforementioned technical issues, the present disclosure provides a battery protection board, a battery module, and an electronic device. These devices are suitable for use in electronic devices equipped with battery modules, such as smartphones, tablets, smartwatches, and smart bracelets. The battery protection board and battery cells constitute a battery module, which is then used in electronic devices. The subsequent embodiments use the battery module as an example to describe the solution.

[0034] The inventive concept of the embodiment scheme of the present disclosure is: first, the battery module needs to be provided with two-stage protection circuits, namely the first protection circuit and the second protection circuit. Only the first protection circuit is provided on the battery protection board and the second protection circuit is provided on the main board, which can reduce the number of protection circuits of the battery protection board, which is beneficial to reducing the size of the battery protection board, and is beneficial to reducing the charging current of the battery protection board and reducing power consumption; second, the battery protection board includes a first sub-board and a second sub-board. The first protection circuit is provided on the second sub-board and the first sub-board is provided with a connecting line, which can reduce the size of the first sub-board and is beneficial to reducing the size of the first sub-board. When the battery protection board is connected to the battery cell, the first sub-board is electrically connected to the battery cell and the second sub-board is away from the battery cell, which is beneficial to ensure heat dissipation of the battery cell and the first protection circuit, and ensure normal operation of the battery cell and the battery protection board.

[0035] In one embodiment, the present disclosure provides a battery module 10, see Figure 1 , including: a battery protection board 11 and a battery cell. The preset side of the battery cell is provided with a power terminal, wherein the power terminals B+ (battery cell positive electrode) and B- (battery cell negative electrode) are as shown in FIG. Figure 2 As shown. The battery protection board 11 includes connection terminals A+ and A-, and the connection terminals A+ and A- are as shown. Figure 3 The power terminals B+ and B- of the battery cell are connected to the connection terminals of the battery protection board 11 in sequence, that is, B+ is electrically connected to A+, and B- is electrically connected to A-, thereby forming a charge and discharge circuit of the battery cell.

[0036] Combine Figure 1 and Figure 3As shown, in the coordinate system xyz, the length of the battery cell in the x-axis direction is regarded as the battery cell width, the length in the y-axis direction is regarded as the battery cell length, and the length in the z-axis direction is regarded as the battery cell thickness; the length of the first sub-board 111 of the battery protection board 11 in the x-axis direction is regarded as the length of the first sub-board 111, the length in the z-axis direction is regarded as the width of the first sub-board 111, and the length in the y-axis direction is regarded as the thickness of the first sub-board 111.

[0037] Combine Figures 1 to 3 It can be seen that when the connection terminals A+ and A- are connected to the power terminals B+ and B- respectively, when looking from the positive direction of the z-axis to the negative direction of the z-axis, the angle between the second side surface of the first sub-board 111 and the preset side surface of the battery cell is less than or equal to the second preset angle, and the value range of the second preset angle is [5, 15] degrees. Taking the second preset angle as 10 degrees as an example, the range of the angle between the second side surface of the first sub-board 111 and the preset side surface of the battery cell is [-10, +10] degrees. In other words, the second side surface of the first sub-board 111 is parallel or approximately parallel to the preset side surface of the battery cell. In this way, in the length direction of the battery cell (y-axis direction), the space occupied by the first sub-board 111 will be less than (or equal to) the sum of the thickness of the first sub-board 111 and the thickness of the connection terminal. Compared with the solution in the related art in which the space occupied by the first sub-plate 111 is the sum of its width and the length of the battery cell tab, the space occupied by the first sub-plate 111 can be reduced in the length direction of the battery cell. When the space occupied by the battery module 10 is fixed, the length of the battery cell can be increased, which is beneficial to improving the capacity of the battery cell.

[0038] In one embodiment, see Figure 4 The power terminals B+ and B- of the cell can be implemented using tabs E. A portion E1 of the tab E is perpendicular to the predetermined side surface of the cell (parallel to plane xoz), while another portion E2 is parallel to the predetermined side surface of the cell. This embodiment ensures a short distance between the first sub-board 111 and the cell, reducing the space occupied by the first sub-board 111.

[0039] In another embodiment, the power terminals B+ and B- of the cell are implemented using copper sheets on a predetermined side surface. Similarly, the connection terminals on the second side surface of the first sub-board 111 are copper sheets provided on the second side surface. Physical contact between the copper sheet of the cell and the copper sheet of the first sub-board 111 can be achieved by welding, pressing, or bolting. Thus, in this embodiment, the size of the cell can be increased by removing the tab E.

[0040] In one embodiment, the battery protection board 11 includes the first sub-board 111. Figure 5, also includes a second sub-board 112 and a first protection circuit 113. The first protection circuit 113 is disposed on the second sub-board 112 and is electrically connected to the battery cell via the connecting wires of the first sub-board 111. Placing the first protection circuit 113 on the second sub-board 112 while providing connecting wires to the first sub-board 111 eliminates the need for components for the first protection circuit 113, reducing the size of the first sub-board 111 and facilitating the increase in the size of the battery cell. Furthermore, providing only the first protection circuit 113 on the battery protection board 11 reduces the number of protection circuits on the battery protection board 11, facilitating the reduction in the size of the battery protection board 11 and reducing the charging current and power consumption of the battery protection board. Furthermore, when the battery protection board 11 is connected to the battery cell, the first sub-board 111 is electrically connected to the battery cell while the second sub-board 112 is positioned away from the battery cell. This helps ensure heat dissipation between the battery cell and the first protection circuit 113, ensuring proper operation of the battery cell and the battery protection board 11.

[0041] In one embodiment, the battery protection board 11 further includes a bending portion 114. The bending portion 114 is used to fix the first sub-board 111 and the second sub-board 112; and the angle between the first side surface of the first sub-board 111 and the first side surface of the second sub-board 112 is less than or equal to a first preset angle. The value range of the first preset angle is [80, 100] degrees. In one example, the value of the first preset angle is 90 degrees, that is, the angle between the first side surface of the first sub-board 111 and the first side surface of the second sub-board 112 is less than or equal to 90 degrees. In other words, the two are perpendicular or approximately perpendicular. In this way, the second sub-board 112 can overlap with the main board in the x-axis direction, thereby reducing the space occupied by the second sub-board 112.

[0042] In one embodiment, see Figure 6 , the second sub-board 112 includes a first substrate provided with a multi-layer structure. For example, the multi-layer structure may include multiple insulating layers, a base material layer and multiple copper-plated layers. The multiple insulating layers, the base material layer and the multiple copper-plated layers can be based on the base material layer, and copper-plated layers are formed on both sides of a substrate layer respectively. The copper-plated layers can be etched to form patterns (patterns), and then an insulating layer is formed on the copper-plated layer and a new copper-plated layer is formed to form other patterns. Protection switching devices MOS and MOS2 can be set between any two copper-plated layers, and the number of protection switching devices can be set according to the specific scenario. Circuit paths can be formed between different copper-plated layers by flowing metal materials into blind holes or through holes. In this way, in this embodiment, by embedding the protection switching device into the interior of the first substrate, since the protection switching device can be manufactured using a semiconductor process, the packaging structure of the protection switching device can be omitted, which is conducive to reducing the thickness of the second sub-board 112.

[0043] In one embodiment, see Figure 6 The first protection circuit 113 further includes an electric meter module 61 and a first protection chip module 62. The electric meter module 61 can be disposed on the first side surface S1 of the first substrate, and / or the first protection chip module 62 can be disposed on the first side surface S1 of the first substrate. In some examples, the first side surface can be injection molded to enhance the mechanical strength of the second sub-board 112.

[0044] In one embodiment, considering that the first sub-board 111 is only provided with connection lines, the first sub-board 111 may include a wiring layer and a substrate. Figure 7 The first sub-board 111 includes a wiring layer 71 and a substrate 72; the wiring layer 71 is formed on the first side of the substrate 72, and the wiring layer 71 is provided with a connection line 73; the connection line 73 connects the first protection circuit 113 and the battery cell respectively. Thus, in this embodiment, by setting the first sub-board 111 as a two-layer, the thickness of the first sub-board 111 can be reduced. Figure 1 The illustrated configuration can further reduce the space occupied by the first sub-board 111 .

[0045] It should be noted that the wiring layer 71 forms a first matching terminal for electrically connecting to some components of the first protection circuit 113. The second side surface of the substrate 72 forms a power terminal as the connection terminals A+ and A- of the first sub-board 111 to electrically connect to the power terminals of the battery cell.

[0046] In one embodiment, considering that the thickness of the first sub-board 111 is relatively small, see Figure 8 The first sub-board 111 further includes a support layer 73. The support layer 81 is disposed on the second side surface of the substrate 72; the second side surface and the first side surface are two side surfaces of the substrate 72, respectively. In other words, the wiring layer 71, the substrate 72, and the support layer 73 are disposed in this order. In this embodiment, the provision of the support layer 73 increases the mechanical strength of the first sub-board 111, ensuring that the first sub-board 111 has good mechanical strength even when it is capable of bending.

[0047] In one embodiment, the battery module 10 further includes a communication interface provided on the battery protection board 11; the communication interface is electrically connected to the first protection circuit 113 and the external main board. For example, the communication interface may be I 2 C bus, etc., in the case where data transmission can be achieved, the corresponding solution falls within the protection scope of this disclosure.

[0048] Based on the battery module provided in the embodiment of the present disclosure, the embodiment of the present disclosure also provides an electronic device, see Figure 9, including a main board 20 and the above-mentioned battery module 10; the main board 20 includes a second protection circuit 91, and the second protection circuit 91 is electrically connected to the battery module 10; the second protection circuit 91 and the first protection circuit of the battery module 10 serve as the second-stage protection circuit of the battery module 10, thereby meeting safety requirements.

[0049] In one embodiment, see Figure 9 The main board 20 also includes a power management module 92 and a communication interface 93; the power management module 92 is electrically connected to the first protection circuit 113 and the second protection circuit 91 respectively, and the communication interface 93 of the main board 20 is electrically connected to the communication interface of the battery module 10; the power management module 92 is used to obtain the battery cell parameters of the battery module 10 through the communication interface 93, and control the first protection circuit 113 and / or the second protection circuit 91 to switch to the disconnected state according to the battery cell parameters and the preset protection threshold to protect the battery module 10.

[0050] In one embodiment, see Figure 9 The main board 20 further includes a first charge pump 94 and a second charge pump 25 ; the first charge pump 94 and the second charge pump 25 are electrically connected to the first protection circuit 113 of the battery protection board 11 respectively.

[0051] In one embodiment, see Figure 9 The mainboard 20 also includes a current limiting circuit 26; this current limiting circuit 26 is electrically connected to the first protection circuit 113 of the battery module 10 and the first charge pump 94 of the mainboard 20, respectively. The current limiting circuit 26 is used to balance the charging current between the battery protection board 11 and the mainboard 20. Thus, by balancing the charging current between the battery module 10 and the mainboard 20, this embodiment alleviates the problem of severe heating caused by the large internal resistance of components on the second sub-board 112 (such as the fuel gauge / protection switch), thereby protecting the second sub-board 112.

[0052] In one embodiment, see Figure 9 The electronic device further includes a middle frame and a rear shell; the battery module 10 is fixed to the middle frame by double-sided tape; or the battery module 10 is fixed to the middle frame by bolts; or the battery module 10 is fixed by pressing the rear shell. Figure 10 The electronic device 1000 may include one or more of the following components: a processing component 1002 , a memory 1004 , a power supply component 1006 , a multimedia component 1008 , an audio component 1010 , an input / output (I / O) interface 1012 , a sensor component 1014 , a communication component 1016 , and an image acquisition component 1018 .

[0053] The processing component 1002 generally controls the overall operation of the electronic device 1000, such as operations associated with display, phone calls, data communications, camera operation, and recording operations. The processing component 1002 may include one or more processors 1020 to execute computer programs. Furthermore, the processing component 1002 may include one or more modules to facilitate interaction between the processing component 1002 and other components. For example, the processing component 1002 may include a multimedia module to facilitate interaction between the multimedia component 1008 and the processing component 1002. In one example, the processing component may include a processor configured to perform the antenna control method described above.

[0054] The memory 1004 is configured to store various types of data to support operations on the electronic device 1000. Examples of such data include computer programs configured to support any application or method operating on the electronic device 1000, contact data, phone book data, messages, pictures, videos, etc. The memory 1004 can be implemented by any type of volatile or non-volatile storage device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0055] The multimedia component 1008 includes a screen that provides an output interface between the electronic device 1000 and the target object. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input information from the target object. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor can not only sense the boundaries of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation.

[0056] The audio component 1010 is configured to output and / or input audio file information. For example, the audio component 1010 includes a microphone (MIC), and when the electronic device 1000 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode, the microphone is configured to receive external audio file information. The received audio file information can be further stored in the memory 1004 or sent via the communication component 1016. In some embodiments, the audio component 1010 also includes a speaker that is configured to output the audio file information.

[0057] The I / O interface 1012 provides an interface between the processing component 1002 and a peripheral interface module, which may be a keyboard, a click wheel, a button, etc. In one example, the I / O interface 1012 includes the aforementioned buttons.

[0058] The sensor assembly 1014 includes one or more sensors configured to provide various aspects of the status assessment of the electronic device 1000. For example, the sensor assembly 1014 can detect the open / closed state of the electronic device 1000, the relative positioning of components, such as the display screen and keypad of the electronic device 1000, and can also detect changes in the position of the electronic device 1000 or a component, the presence or absence of contact between the electronic device 1000 and the target object, the orientation or acceleration / deceleration of the electronic device 1000, and changes in the temperature of the electronic device 1000.

[0059] The communication component 1016 is configured to facilitate wired or wireless communication between the electronic device 1000 and other devices. The electronic device 1000 can access a wireless network based on a communication standard, such as WiFi, 2G, 3G, 4G, 5G, or a combination thereof. In an exemplary embodiment, the communication component 1016 receives broadcast information or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 1016 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0060] In an exemplary embodiment, the electronic device 1000 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0061] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the disclosure herein. This disclosure is intended to cover any variations, uses, or adaptations that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

[0062] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery protection board, characterized in that: The battery protection board includes a first protection circuit, a first sub-board and a second sub-board; the first protection circuit is arranged on the second sub-board, and the first protection circuit is electrically connected to the battery cell through the connecting wire of the first sub-board.

2. The battery protection board according to claim 1, characterized in that: The second sub-board includes a first substrate provided with a multi-layer structure; the first protection circuit includes a protection switch device; and the protection switch device is embedded in the first substrate.

3. The battery protection board according to claim 2, characterized in that: The first protection circuit also includes at least one of a power meter module and a first protection chip module; the power meter module and / or the first protection chip module are arranged on the first side of the first substrate; and a connecting end is provided on the second side of the first substrate, and the connecting end is used to electrically connect to the first matching end on the first side of the first sub-board.

4. The battery protection board according to claim 1, characterized in that: The first sub-board includes a wiring layer and a substrate; the wiring layer is formed on the first side surface of the substrate, and the wiring layer is provided with connecting wires; the connecting wires are respectively connected to the first protection circuit and the battery cell.

5. The battery protection board according to claim 4, characterized in that: The first sub-board further includes a supporting layer, and the supporting layer is arranged on the second side surface of the substrate; the second side surface and the first side surface are two side surfaces of the substrate respectively.

6. The battery protection board according to claim 4, characterized in that: A first matching end is provided on the first side surface of the wiring layer, and the first matching end is used to be electrically connected to the connection end of the second sub-board.

7. The battery protection board according to claim 4, characterized in that: A power supply terminal is provided on the second side surface of the substrate, and the power supply terminal is used to be electrically connected to the power supply terminal of the battery cell.

8. The battery protection board according to claim 1, characterized in that: The battery protection board further includes a bending portion, which is used to fix the first sub-board and the second sub-board; and an angle between the first side surface of the first sub-board and the first side surface of the second sub-board is less than or equal to a first preset angle.

9. A battery module, characterized in that: The battery module includes a battery cell and a battery protection board as described in any one of claims 1 to 8; the preset side surface of the battery cell includes a power terminal, and the power terminal is electrically connected to the connection end of the second side surface of the first sub-board in the battery protection board; and the angle between the second side surface and the preset side surface is less than or equal to the second preset angle.

10. The battery module according to claim 9, characterized in that: The connection terminal of the battery cell is a copper sheet arranged on a preset side surface, and the connection end on the second side surface is a copper sheet arranged on the second side surface.

11. An electronic device, characterized in that: A battery module comprising a main board and the battery module according to claim 9 or 10; the main board comprising a second protection circuit, the second protection circuit being electrically connected to the battery module; The second protection circuit and the first protection circuit of the battery module serve as a two-stage protection circuit of the battery module.

12. The electronic device according to claim 11, wherein: The mainboard further includes a power management module and a communication interface; the power management module is electrically connected to the first protection circuit and the second protection circuit respectively, and the communication interface of the mainboard is electrically connected to the communication interface of the battery module; The power management module is used to obtain the cell parameters of the battery module through the communication interface, and control the first protection circuit and / or the second protection circuit to switch to the disconnected state according to the cell parameters and the preset protection threshold to protect the battery.

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