Battery protection board, battery and electronic equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery protection plate, a battery and electronic equipment. The battery protection plate comprises a hard plate structure and a soft plate structure, the hard plate structure is provided with a first wall surface and a second wall surface which are oppositely arranged, a first concave part is arranged on the side of the first wall surface, the soft plate structure is arranged on the second wall surface, and the soft plate structure is bent to the first wall surface and is attached to the interior of the first concave part. The battery comprises the battery protection plate. The electronic equipment comprises the battery. The battery protection plate provided by the utility model is thin in thickness, small in size and capable of occupying smaller space of the battery. The battery and the electronic equipment provided by the utility model are high in energy density.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery protection board, a battery and an electronic device. Background Art

[0002] Soft-pack batteries are lithium-ion batteries that use aluminum-plastic film as their outer shell. They have the advantages of being light weight, small size, and adaptable in shape, and are widely used in portable electronic devices such as mobile phones and tablets. The packaging of soft-pack batteries PACK refers to the process of assembling the battery cell with components such as the protection board and connecting wires into a whole. The protection board is an important component used to monitor and control the working status of the battery cell and prevent abnormal conditions such as overcharging, over-discharging, and short circuits. Common protection boards include SIP (System In Package) and COB (Chip On Board). SIP packaging refers to integrating the protection chip and other devices on a rigid PCB, and then plastic-sealing the devices on the rigid board to form an independent module.

[0003] However, the overall thickness of the current protective plate combination structure is relatively thick, which occupies a large space in the battery. Under the premise of keeping the design size of the battery unchanged, the current protective plate combination structure will cause the energy density of the battery to decrease. Utility Model Content

[0004] The main purpose of the utility model is to propose a battery protection plate, a battery and an electronic device, aiming to solve the technical problem that the overall thickness of the current protection plate combination structure is too thick, which occupies a large space in the battery. While keeping the design size of the battery unchanged, the current protection plate combination structure will cause the energy density of the battery to decrease.

[0005] To achieve the above objectives, the present invention proposes a battery protection board, comprising:

[0006] A hard plate structure, the hard plate structure having a first wall surface and a second wall surface disposed opposite to each other, a first recessed portion being disposed on a side of the first wall surface;

[0007] A soft board structure is provided on the second wall surface, and the soft board structure is bent to the first wall surface and fits in the first recessed portion.

[0008] In some embodiments, the first wall surface is provided with at least two first recessed portions, and the soft board structure is fitted into each of the first recessed portions.

[0009] In some embodiments, a first protective plate is provided on one side of the first wall surface between the hard plate structure and the soft plate structure, and the first recessed portion is provided on a side of the first protective plate close to the soft plate structure.

[0010] In some embodiments, an injection molding structure is formed between the first protection plate and the hard plate structure, and the first protection plate is a structure made of epoxy resin.

[0011] In some embodiments, a second protective plate is provided between the hard plate structure and the soft plate structure on one side of the second wall surface, a second recess is provided on the side of the second protective plate close to the soft plate structure, and the soft plate structure is fitted into the second recess.

[0012] In some embodiments, the second protective plate is provided with at least two second recessed portions.

[0013] In some embodiments, an injection-molded structure is formed between the second protective plate and the hard plate structure, and the second protective plate is a structure made of epoxy resin.

[0014] In some embodiments, the battery protection plate is provided with a first metal sheet and a second metal sheet, wherein the first metal sheet is used to connect the positive electrode ear of the battery cell, and the second metal sheet is used to connect the negative electrode ear of the battery cell.

[0015] In some embodiments, the battery protection board includes a temperature sensor, and the temperature sensor is disposed at either end of the battery protection board.

[0016] Correspondingly, the present invention also provides a battery, comprising the battery protection board described in any of the above embodiments.

[0017] Correspondingly, the present invention also provides an electronic device, comprising the battery described above.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] In the technical solution of the present invention, a hard-soft battery protection board is provided which is a combination of a hard plate structure and a soft plate structure, so that the battery protection board has the advantages of high reliability and low manufacturing cost of the hard plate structure and the advantages of light weight, strong adaptability and free bending of the soft plate structure. By providing a first recessed portion on the first wall side of the hard plate structure, when the hard plate structure and the soft plate structure are combined, the soft plate structure located on the first wall side of the hard plate structure can be bent into the first recessed portion. The above structure is conducive to eliminating the influence of the thickness of the soft plate structure on the overall thickness of the battery protection board, thereby helping to reduce the overall volume of the battery protection board, so that the space occupied by the battery protection board is small. Under the premise of keeping the design size of the battery unchanged, the smaller the volume of the battery protection board, the larger the space that can be provided to the battery cell, thereby helping to increase the capacity of the battery and improve the energy density of the battery.

[0020] At the same time, the above-mentioned structure can ensure that the overall thickness of the battery protection plate is not increased while reducing the thickness restriction of the soft board structure, so that even if the thickness of the soft board structure is increased, it will not affect the overall thickness of the battery protection plate. In addition, the flow capacity of the soft board structure can be increased by increasing the thickness of the soft board structure, thereby reducing the temperature rise of the battery protection plate and improving the performance of the battery protection plate.

[0021] The battery using the battery protection board is beneficial to reducing the space occupied by the battery protection board in the battery, thereby helping to improve the energy density of the battery.

[0022] The electronic device using the above-mentioned battery can save the internal space of the electronic device to a certain extent, making the assembly and processing of the electronic device more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 A front view of the structure of a battery protection plate provided by an embodiment of the present utility model;

[0025] Figure 2 A top view of the structure of a battery protection plate provided in one embodiment of the present utility model;

[0026] Figure 3 A bottom view of the structure of a battery protection plate provided in one embodiment of the present utility model;

[0027] Figure 4 This is a front view of the structure of a battery protection plate provided by another embodiment of the present invention.

[0028] Description of Figure Numbers:

[0029] 100-hard board structure;

[0030] 110-the first wall; 120-the second wall;

[0031] 200-flexible board structure;

[0032] 300-first protection plate;

[0033] 310-first recessed portion;

[0034] 400-second protection plate;

[0035] 410 - second recessed portion;

[0036] 500-first metal sheet;

[0037] 600-second metal sheet;

[0038] 700-Temperature sensor.

[0039] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or", "and / or" or "and / or" appear in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] Soft-pack batteries are lithium-ion batteries that use aluminum-plastic film as their outer shell. They have the advantages of being light weight, small size, and adaptable in shape, and are widely used in portable electronic devices such as mobile phones and tablets. The packaging of soft-pack batteries PACK refers to the process of assembling the battery cell with components such as the protection board and connecting wires into a whole. The protection board is an important component used to monitor and control the working status of the battery cell and prevent abnormal conditions such as overcharging, over-discharging, and short circuits. Common protection boards include SIP (System In Package) and COB (Chip On Board). SIP packaging refers to integrating the protection chip and other devices on a rigid PCB, and then plastic-sealing the devices on the rigid board to form an independent module.

[0044] However, the overall thickness of the current protective plate combination structure is relatively thick, which occupies a large space in the battery. Under the premise of keeping the design size of the battery unchanged, the current protective plate combination structure will cause the energy density of the battery to decrease.

[0045] Based on this, refer to Figures 1 to 3 An embodiment of the present invention provides a battery protection board, including a hard board structure 100 and a soft board structure 200. The hard board structure 100 has a first wall 110 and a second wall 120 arranged opposite to each other. A first recessed portion 310 is provided on the side of the first wall 110. The soft board structure 200 is arranged on the second wall 120, and the soft board structure 200 is bent to the first wall 110 and fits into the first recessed portion 310.

[0046] Furthermore, in this embodiment, the rigid board structure 100 can be a PCB (Printed Circuit Board) rigid board, and the flexible board structure 200 can be an FPC (Flexible Printed Circuit) flexible board. Because the rigid board structure 100 has advantages such as high strength, hardness, and good support performance, while the flexible board structure 200 has advantages such as light weight and the ability to bend and fold freely in three-dimensional space, this rigid-flexible board structure not only ensures the overall strength of the battery protection board, but also can save internal space of the electronic device to a certain extent, making the assembly and processing of the electronic device more flexible.

[0047] It should be noted that the "hard" and "soft" mentioned in this embodiment are relative, that is, the hardness of the hard board structure 100 is higher than that of the soft board structure 200, and the hardness of the soft board structure 200 is lower than that of the hard board structure 100, and the soft board structure 200 can be bent arbitrarily.

[0048] Specifically, in this embodiment, a hard-soft battery protection board is provided, which combines a hard board structure 100 and a soft board structure 200. This allows the battery protection board to have both the advantages of high reliability and low manufacturing cost of the hard board structure 100 and the advantages of light weight, strong adaptability, and free bending of the soft board structure 200. By providing a first recessed portion 310 on the side of the first wall 110 of the hard board structure 100, when the hard board structure 100 and the soft board structure 200 are combined, the soft board structure 200 located on the side of the first wall 110 of the hard board structure 100 can be bent into the first recessed portion 310. The above structure is conducive to eliminating the influence of the thickness of the soft board structure 200 on the overall thickness of the battery protection board, thereby facilitating the reduction of the overall volume of the battery protection board, so that the battery protection board occupies a small space. Under the premise of keeping the design size of the battery unchanged, the smaller the volume of the battery protection board, the more space can be provided for the battery cell, thereby facilitating the increase of the battery capacity and the improvement of the battery energy density.

[0049] At the same time, the above-mentioned structure ensures that the overall thickness of the battery protection board is not increased while reducing the thickness restriction of the soft board structure 200, so that even if the thickness of the soft board structure 200 is increased, it will not affect the overall thickness of the battery protection board. In addition, the flow capacity of the soft board structure 200 can be increased by increasing the thickness of the soft board structure 200, thereby reducing the temperature rise of the battery protection board and improving the performance of the battery protection board.

[0050] Furthermore, in some embodiments, the first recessed portion 310 may be a rectangular parallelepiped groove structure, and structural parameters such as thickness and size of the first recessed portion 310 may be adaptively set according to structural parameters such as thickness and size of the flexible board structure 200 .

[0051] Furthermore, in some embodiments, within the entire battery protection board structure, tall components can be concentrated in the middle of the rigid board structure 100, while shorter components can be concentrated on both sides of the rigid board structure 100. By injection molding a first recessed portion 310 on the rigid board structure 100, the first wall surface 110 of the rigid board structure 100 can be formed at different heights, thereby forming a stepped board. By adopting a stepped board structure, the flexible board structure 200 can be placed in a low-step area, thereby reducing the impact of the flexible board structure 200 on the overall thickness of the battery protection board, ensuring that the thickness of the flexible board structure 200 can be appropriately increased without increasing the overall thickness of the battery protection board.

[0052] In some embodiments, reference Figures 1 to 3 The first wall surface 110 is provided with at least two first recessed portions 310 , and a soft board structure 200 is attached to each first recessed portion 310 . For example, the two first recessed portions 310 can be respectively provided at opposite ends of the first wall surface 110 .

[0053] Specifically, in this embodiment, since the soft board structure 200 is bent at both ends of the first wall 110 of the hard board structure 100, the soft board structures 200 at both ends of the first wall 110 are correspondingly arranged in the first recessed portion 310, which can simultaneously reduce the thickness limit of the soft board structure 200 at both ends of the first wall 110, so that even if the thickness of the soft board structure 200 at both ends of the first wall 110 is increased at the same time, it will not affect the overall thickness of the battery protection board. Therefore, the flow capacity of the soft board structure 200 can be further increased by simultaneously increasing the thickness of the soft board structure 200 at both ends of the first wall 110, thereby reducing the temperature rise of the battery protection board and improving the performance of the battery protection board.

[0054] In some embodiments, reference Figures 1 to 3 , located on one side of the first wall 110 , a first protective plate 300 is provided between the hard plate structure 100 and the soft plate structure 200 , and a first recessed portion 310 is provided on one side of the first protective plate 300 close to the soft plate structure 200 .

[0055] Specifically, in this embodiment, electronic component structures such as resistors can be provided on the first protection plate 300. On the one hand, the first protection plate 300 can protect the electronic components and prevent the electronic components from being damaged and affecting the performance of the battery protection plate; on the other hand, the first protection plate 300 can also play a role in heat dissipation, ensuring that the battery protection plate can be maintained within a normal temperature range when in working state, and preventing the battery protection plate from being overheated when in working state and causing the battery protection plate to malfunction.

[0056] Furthermore, in this embodiment, since the first protective plate 300 is disposed between the rigid plate structure 100 and the flexible plate structure 200, a first recessed portion 310 is provided on the side of the first protective plate 300 facing the flexible plate structure 200, allowing the flexible plate structure 200 to bend and fit within the first recessed portion 310. This appropriately increases the thickness of the flexible plate structure 200, allowing the flexible plate structure 200 disposed within the first recessed portion 310 to be flush with the surface of the first protective plate 300. Therefore, by adopting the above-described structural form of disposing the flexible plate structure 200 within the first recessed portion 310, even if the thickness of the flexible plate structure 200 is increased, the overall thickness of the battery protection plate is not affected. This ensures that the battery protection plate is thinner while still maintaining its flow capacity, reducing the temperature rise of the battery protection plate, and improving its performance.

[0057] It should be noted that the formation of the first recess 310 on the first protective plate 300 does not affect the performance of the first protective plate 300. The first protective plate 300 can still provide good support and protection for electronic components such as resistors, and the first protective plate 300 can still provide good heat dissipation.

[0058] In some embodiments, an injection molding structure is formed between the first protection plate 300 and the hard plate structure 100 , and the first protection plate 300 is a structure made of epoxy resin.

[0059] Specifically, in this embodiment, the injection molding process is used between the first protection plate 300 and the hard plate structure 100, which not only improves the connection stability between the first protection plate 300 and the hard plate structure 100, but also helps to improve the production efficiency of the battery protection plate, shorten the production cycle of the battery protection plate, and reduce the production cost of the battery protection plate. The first protection plate 300 is made of epoxy resin material, which can ensure that the first protection plate 300 has high strength and rigidity, which is conducive to extending the service life of the battery protection plate. It can also ensure that the first protection plate 300 has good thermal stability, which is conducive to improving the heat dissipation performance of the battery protection plate. It can also ensure that the first protection plate 300 has excellent insulation performance, which is conducive to preventing internal short circuits in the battery protection plate.

[0060] In some embodiments, reference Figure 4 , located on one side of the second wall 120, a second protective plate 400 is arranged between the hard board structure 100 and the soft board structure 200, and a second recessed portion 410 is provided on one side of the second protective plate 400 close to the soft board structure 200, and the soft board structure 200 is fitted into the second recessed portion 410.

[0061] Specifically, referring to the above embodiment, in order to make the battery protection board adaptable to more models of electronic devices and meet more structural requirements of electronic devices, in addition to the first protection board 300 provided on one side of the first wall 110 of the hard board structure 100, a second protection board 400 may also be provided on one side of the second wall 120 of the hard board structure 100. Based on the same structural principle as the first protection board 300, the second protection board 400 may also be provided with electronic component structures such as resistors. On the one hand, the second protection board 400 can protect the electronic components and prevent them from being damaged and affecting the performance of the battery protection board. On the other hand, the second protection board 400 can also dissipate heat to ensure that the battery protection board can be maintained within a normal temperature range when in operation, and prevent the battery protection board from overheating during operation and causing malfunction of the battery protection board.

[0062] Furthermore, in this embodiment, the flexible board structure 200 disposed on the second wall surface 120 of the rigid board structure 100 may be partially or entirely disposed within the second recessed portion 410. Since the second protective plate 400 is disposed between the rigid board structure 100 and the flexible board structure 200, a second recessed portion 410 is provided on the side of the second protective plate 400 facing the flexible board structure 200, allowing the flexible board structure 200 to fit within the second recessed portion 410. This appropriately increases the thickness of the flexible board structure 200, allowing the flexible board structure 200 disposed within the second recessed portion 410 to be flush with the surface of the second protective plate 400. Therefore, by adopting the above-described structural form of disposing the flexible board structure 200 within the second recessed portion 410, even if the thickness of the flexible board structure 200 is increased, the overall thickness of the battery protection plate is not affected. This ensures that the battery protection plate is lighter and thinner while also maintaining the flow capacity of the battery protection plate, reducing the temperature rise of the battery protection plate, and improving the performance of the battery protection plate.

[0063] In combination with the above embodiments, by partially or completely fitting the soft board structure 200 arranged on the side of the first wall 110 of the hard board structure 100 into the first recessed portion 310, and partially or completely fitting the soft board structure 200 arranged on the side of the second wall 120 of the hard board structure 100 into the second recessed portion 410, the thickness of the soft board structure 200 can be increased to a greater extent while ensuring that the overall thickness of the battery protection board remains unchanged, further improving the flow capacity of the soft board structure 200, and more effectively reducing the temperature rise of the battery protection board.

[0064] It should be noted that the second recess 410 on the second protective plate 400 does not affect the performance of the second protective plate 400. The second protective plate 400 can still provide good support and protection for electronic components such as resistors, and the second protective plate 400 can still provide good heat dissipation.

[0065] In some embodiments, reference Figure 4 At least two second recessed portions 410 are provided on the second protection plate 400. For example, the two second recessed portions 410 may be provided at opposite ends of the second protection plate 400, respectively.

[0066] Specifically, in this embodiment, since a soft board structure 200 is provided on the side of the second wall 120 of the hard board structure 100, and a battery protection board may include multiple soft board structures 200, the multiple soft board structures 200 are partially or completely provided in the second recessed portion 410, which can simultaneously reduce the thickness restriction of the soft board structure 200 on the side of the second wall 120, so that even if the thickness of the soft board structure 200 on the side of the second wall 120 is increased at the same time, it will not affect the overall thickness of the battery protection board. Therefore, the flow capacity of the soft board structure 200 can be further increased by simultaneously increasing the thickness of the soft board structure 200 on the side of the second wall 120, thereby reducing the temperature rise of the battery protection board and improving the performance of the battery protection board.

[0067] In some embodiments, an injection molding structure is formed between the second protection plate 400 and the hard plate structure 100 , and the second protection plate 400 is a structure made of epoxy resin.

[0068] Specifically, in this embodiment, the second protection plate 400 and the hard plate structure 100 are formed by injection molding, which not only improves the connection stability between the second protection plate 400 and the hard plate structure 100, but also helps to improve the production efficiency of the battery protection plate, shorten the production cycle of the battery protection plate, and reduce the production cost of the battery protection plate. The second protection plate 400 is made of epoxy resin material, which can ensure that the second protection plate 400 has high strength and rigidity, which is conducive to extending the service life of the battery protection plate. It can also ensure that the second protection plate 400 has good thermal stability, which is conducive to improving the heat dissipation performance of the battery protection plate. It can also ensure that the second protection plate 400 has excellent insulation performance, which is conducive to preventing internal short circuits in the battery protection plate.

[0069] In some embodiments, reference Figure 1 and Figure 3 The battery protection plate is separated by a first metal sheet 500 and a second metal sheet 600. The first metal sheet 500 is used to connect to the positive terminal of the battery cell, and the second metal sheet 600 is used to connect to the negative terminal of the battery cell. For example, the first metal sheet 500 and the second metal sheet 600 can both be nickel sheets.

[0070] It is understandable that the first metal sheet 500 can also be used to connect the negative electrode tab of the battery cell, and the second metal sheet 600 can also be used to connect the positive electrode tab of the battery cell.

[0071] Specifically, in this embodiment, since the battery protection board can only function properly when powered, it is necessary to connect the battery protection board to the battery cell during assembly to establish a current path between the battery protection board and the battery cell, thereby fully utilizing the battery protection board's functionality. Therefore, the first metal sheet 500 can be welded to the positive tab of the battery cell, and the second metal sheet 600 can be welded to the negative tab of the battery cell, thereby establishing a current path between the battery cell and the battery protection board.

[0072] In some embodiments, reference Figures 1 to 4 The battery protection board includes a temperature sensor 700, which is disposed at either end of the battery protection board. For example, the temperature sensor 700 may be a lead NTC (thermistor) or a chip NTC (thermistor).

[0073] Specifically, in this embodiment, the temperature sensor 700 can be used to monitor the temperature of the battery cell in real time to ensure that the battery cell is within a normal temperature fluctuation range when in operation. When the temperature sensor 700 is a lead NTC, the match head of the lead NTC needs to be fixed to the top sealing surface of the battery cell using thermally conductive adhesive. When the temperature sensor 700 is a chip NTC, the chip NTC needs to be attached to the wall where the first metal sheet 500 and the second metal sheet 600 are located, and it is best to place the chip NTC at the edge of the wall to ensure that the chip NTC can accurately monitor the temperature of the battery cell.

[0074] Correspondingly, another embodiment of the present invention further provides a battery, which includes the battery protection board in any of the above embodiments.

[0075] Specifically, in this embodiment, the battery using the above-mentioned battery protection board is beneficial to reducing the space occupied by the battery protection board in the battery, thereby facilitating improving the energy density of the battery.

[0076] Correspondingly, another embodiment of the present invention further provides an electronic device, which includes the battery in the above embodiment. For example, the electronic device can be a mobile phone, a laptop computer, a digital camera, etc.

[0077] Specifically, in this embodiment, the electronic device using the above-mentioned battery can save the internal space of the electronic device to a certain extent, making the assembly and processing of the electronic device more flexible.

[0078] Thanks to the improvement of the above-mentioned battery protection board, the battery and electronic equipment of this embodiment have the same technical effects as the above-mentioned battery protection board, which will not be described in detail here.

[0079] It should be noted that other contents of the battery protection board, battery and electronic device disclosed in the present invention can be found in the prior art and will not be described in detail here.

[0080] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. Battery protection board, characterized in that, include: A hard plate structure, the hard plate structure having a first wall surface and a second wall surface disposed opposite to each other, a first recessed portion being disposed on a side of the first wall surface; A soft board structure is provided on the second wall surface, and the soft board structure is bent to the first wall surface and fits in the first recessed portion.

2. The battery protection board according to claim 1, characterized in that: The first wall surface is provided with at least two first recessed portions, and the soft board structure is fitted into each of the first recessed portions.

3. The battery protection board according to claim 1, characterized in that: A first protective plate is provided on one side of the first wall surface between the hard plate structure and the soft plate structure, and the first recessed portion is provided on one side of the first protective plate close to the soft plate structure.

4. The battery protection board according to claim 3, characterized in that: An injection molding structure is formed between the first protection plate and the hard plate structure, and the first protection plate is a structure made of epoxy resin.

5. The battery protection board according to claim 1, characterized in that: A second protective plate is provided on one side of the second wall surface between the hard plate structure and the soft plate structure. A second recessed portion is provided on one side of the second protective plate close to the soft plate structure, and the soft plate structure is fitted into the second recessed portion.

6. The battery protection board according to claim 5, characterized in that: The second protection plate is provided with at least two second recessed portions.

7. The battery protection board according to claim 5, characterized in that: An injection molding structure is formed between the second protection plate and the hard plate structure, and the second protection plate is a structure made of epoxy resin.

8. The battery protection board according to claim 1, characterized in that: The battery protection plate is provided with a first metal sheet and a second metal sheet at intervals. The first metal sheet is used to connect the positive electrode ear of the battery cell, and the second metal sheet is used to connect the negative electrode ear of the battery cell.

9. The battery protection board according to any one of claims 1 to 8, characterized in that: The battery protection board includes a temperature sensor, and the temperature sensor is arranged at either end of the battery protection board.

10. A battery, characterized in that A battery protection plate comprising the battery protection plate according to any one of claims 1 to 9.

11. An electronic device, characterized in that A battery comprising the battery of claim 10.

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