Battery protection plate and battery module

Abstract

The utility model discloses a battery protection board and battery module, battery protection board includes flexible circuit board, first rigid circuit board and second rigid circuit board, the flexible circuit board has the hard board combination area, first rigid circuit board and second rigid circuit board are respectively arranged in the both sides of the opposite side of hard board combination area, one side of first rigid circuit board is away from the flexible circuit board and has the first device mounting surface, one side of second rigid circuit board is away from the flexible circuit board and has the second device mounting surface, and the first device mounting surface and second device mounting surface are all used for setting electronic component. The above -mentioned scheme can solve the problem that the area of battery protection board is bigger.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery protection board and a battery module. Background Technology

[0002] With the increasing popularity of electronic and electrical products, the demand for battery modules is also growing. In related technologies, a battery module typically includes a battery body, a mounting bracket, and a battery protection board. The battery protection board is electrically connected to the battery body's terminals, and both the battery protection board and the battery body are housed on the mounting bracket. Electronic components are arranged on the battery protection board to form a battery management unit, thereby protecting the battery module from charging and discharging.

[0003] However, a large area needs to be reserved on the battery protection board to mount electronic components, which inevitably increases the board's area. The larger area of ​​the battery protection board results in it occupying more space in the mounting bracket, thus making the battery module larger in size. Utility Model Content

[0004] This utility model discloses a battery protection board and a battery module to solve the technical problem of the large area of ​​the battery protection board.

[0005] To solve the above problems, the present invention adopts the following technical solution: A battery protection board, comprising: A flexible circuit board, wherein the flexible circuit board has a rigid board bonding area; A first rigid circuit board and a second rigid circuit board are respectively disposed on opposite sides of the rigid board bonding area. The side of the first rigid circuit board away from the flexible circuit board has a first device mounting surface, and the side of the second rigid circuit board away from the flexible circuit board has a second device mounting surface. Both the first device mounting surface and the second device mounting surface are used to mount electronic components.

[0006] A battery module includes a battery body, a mounting bracket, and the aforementioned battery protection board. The mounting bracket has a battery receiving slot, the battery body is located within the battery receiving slot, a portion of the flexible circuit board is located within the battery receiving slot and connected to the battery body, and the rigid board bonding area is located outside the battery receiving slot.

[0007] The technical solution adopted in this utility model can achieve the following beneficial effects: In the battery protection board disclosed in this utility model, a first rigid circuit board and a second rigid circuit board are respectively disposed on opposite sides of a flexible circuit board. The side of the first rigid circuit board away from the flexible circuit board has a first component mounting surface, and the side of the second rigid circuit board away from the flexible circuit board has a second component mounting surface. Both the first and second component mounting surfaces are used to mount electronic components. In this design, the battery protection board can achieve double-sided component placement, which helps to reduce the area of ​​the protection board, thereby reducing the space occupied by the battery protection board on the mounting bracket and helping to reduce the size of the battery module. Attached Figure Description

[0008] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figures 1 to 6 This is a schematic diagram of the structure of the battery protection board disclosed in an embodiment of the present utility model; Figure 7 This is a schematic diagram of the battery module structure disclosed in an embodiment of the present utility model; Figure 8 This is a schematic diagram of the mounting bracket for the battery module disclosed in an embodiment of this utility model.

[0009] Explanation of reference numerals in the attached figures: 100-Battery protection board, 110-Flexible circuit board, 1101-Rigid board bonding area, 111-Main board segment, 112-First extension segment, 112a-First area, 112b-Second area, 113-Second extension segment, 120-First rigid circuit board, 121-First component mounting surface, 130-Second rigid circuit board, 131-Second component mounting surface, 140-First encapsulation layer, 150-Second encapsulation layer, 160-Electrical connector, 171-First temperature detection unit, 172-Second temperature detection unit, 180-Reinforcing steel sheet, 190-Electronic components, 200-Battery body, 300-Mounting bracket, 310-Battery receiving slot, 320-Circuit board receiving area. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0011] The technical solutions disclosed in the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0012] like Figures 1 to 8 As shown in the figure, this utility model embodiment discloses a battery protection board 100, which includes a flexible circuit board 110, a first rigid circuit board 120 and a second rigid circuit board 130.

[0013] The flexible circuit board 110 is a flexible circuit structure made of polyimide or polyester film as a substrate. The flexible circuit board 110 includes a flexible substrate and a conductive layer. The flexible substrate is generally made of polyimide or polyester film, providing support and insulation. The conductive layer is disposed on the flexible substrate and is typically copper foil, formed by etching the copper foil to create circuit patterns. Of course, the flexible circuit board 110 is not limited to the above structure and may also include a cover layer to protect the conductive lines and reduce electromagnetic interference. An adhesive is used to bond the layers of the flexible circuit board 110. Of course, the flexible circuit board 110 can also have other structures, which are not limited herein.

[0014] The flexible circuit board 110 has a rigid board bonding area 1101, which is a portion of the flexible circuit board 110 and is used to mount a rigid circuit board. Here, a rigid circuit board refers to a circuit structure with a certain degree of rigidity. Rigid circuit boards are typically made of epoxy resin glass cloth, such as FR-4 material. Rigid circuit boards have good mechanical strength, electrical insulation properties, and dimensional stability, providing stable support for electronic components.

[0015] The battery protection board 100 disclosed in this application includes a first rigid circuit board 120 and a second rigid circuit board 130, which are respectively disposed on opposite sides of the rigid board bonding area 1101. Specifically, the rigid board bonding area 1101 has a first surface and a second surface disposed opposite to each other, with the first rigid circuit board 120 disposed on the first surface and the second rigid circuit board 130 disposed on the second surface. The side of the first rigid circuit board 120 facing away from the flexible circuit board 110 has a first device mounting surface 121. The side of the second rigid circuit board 130 facing away from the flexible circuit board 110 has a second device mounting surface 131. Both the first device mounting surface 121 and the second device mounting surface 131 are used to mount electronic components 190. At this time, both the first device mounting surface 121 and the second device mounting surface 131 are provided with corresponding pads, and the electronic components 190 can be soldered onto the first device mounting surface 121 or the second device mounting surface 131 through the pads. The electronic components 190 here include, but are not limited to, chips, capacitors, resistors, inductors, and other devices.

[0016] In the embodiments disclosed in this application, a first rigid circuit board 120 and a second rigid circuit board 130 are respectively provided on opposite sides of the flexible circuit board 110. Both the first rigid circuit board 120 and the second rigid circuit board 130 are capable of mounting electronic components 190. Therefore, the battery protection board 100 disclosed in this application can achieve double-sided component placement. With the battery protection board 100 having a double-sided layout, the length and width dimensions of the battery protection board 100 can be reduced, which is beneficial to reducing the area of ​​the battery protection board 100, thereby reducing the space occupied by the battery protection board 100 on the mounting bracket 300, and thus helping to reduce the volume of the battery module.

[0017] Furthermore, in related technologies, the battery protection board 100 has a large area, which occupies the mounting space of the battery body 200 and the circuit board in the battery module, thus increasing the difficulty of circuit board layout and reducing the size of the battery body 200. In the solution disclosed in this application, because the battery protection board 100 has a smaller area, the space occupied by the battery protection board 100 on the battery body 200 and the circuit board is reduced, thereby reducing the difficulty of circuit board layout and increasing the capacity of the battery body 200, which is beneficial to improving the performance of the battery module.

[0018] Furthermore, components can be arranged on both opposite sides of the battery protection board 100, further increasing the layout area of ​​the battery protection board 100. At this time, the electronic components 190 on the battery protection board 100 can be distributed on the first rigid circuit board 120 and the second rigid circuit board 130, thereby giving the battery protection board 100 a sufficiently large installation area, thus improving the current carrying capacity of the battery protection board 100, and consequently improving the reliability and safety of the battery module.

[0019] In addition, the electronic components 190 on the battery protection board 100 can be distributed on the first rigid circuit board 120 and the second rigid circuit board 130. Therefore, the number of electronic components 190 on the first rigid circuit board 120 and the second rigid circuit board 130 is relatively small, resulting in less heat generation. This is beneficial to improving the heat dissipation performance of the battery protection board 100 and improving the reliability and safety of the battery module.

[0020] The dual-sided component arrangement of the battery protection board 100 in this embodiment not only increases the current carrying capacity of the battery protection board 100, but also increases the component arrangement area of ​​the battery protection board 100, thereby helping to further improve the performance of the battery module.

[0021] In the above scheme, corresponding pads can be provided on the opposite sides of the flexible circuit board 110, and the first rigid circuit board 120 and the second rigid circuit board 130 can be soldered to the flexible circuit board 110 through the corresponding pads. The first rigid circuit board 120 and the second rigid circuit board 130 are electrically connected to the flexible circuit board 110 through the pads. At this time, the flexible circuit board 110 can be an FPC (Flexible Printed Circuit). Both the first rigid circuit board 120 and the second rigid circuit board 130 can be PCBs (Printed Circuit Boards).

[0022] In another optional embodiment, the flexible circuit board 110, the first rigid circuit board 120, and the second rigid circuit board 130 form a rigid-flex board. The flexible circuit board 110 is the flexible portion of the rigid-flex board, while the first rigid circuit board 120 and the second rigid circuit board 130 are the rigid portions of the rigid-flex board. The first rigid circuit board 120 and the second rigid circuit board 130 are respectively pressed onto opposite sides of the flexible circuit board 110. The circuits on the first rigid circuit board 120 and the second rigid circuit board 130 and the flexible circuit board 110 can be interconnected through metallization by processes such as drilling and plated holes.

[0023] In this design, the battery protection board 100 is a rigid-flex board. The flexible board and the rigid board of the rigid-flex board do not need to be connected by a structure such as solder pads, which helps to reduce the thickness of the battery protection board 100.

[0024] The specific lamination and electrical connection methods of the flexible and rigid parts of the rigid-flex board are well-known technologies and will not be elaborated upon in this article.

[0025] In another alternative embodiment, the battery protection board 100 may further include a first encapsulation layer 140 and a second encapsulation layer 150. The first encapsulation layer 140 may cover the first device mounting surface 121, and the second encapsulation layer 150 may cover the second device mounting surface 131. Specifically, after the corresponding electronic components 190 are mounted on the first device mounting surface 121 and the second device mounting surface 131, corresponding injection molding layers may be applied to these surfaces to cover them. This allows the first encapsulation layer 140 to encapsulate and cover the electronic components 190 on the first device mounting surface 121, preventing leakage. Similarly, the second encapsulation layer 150 can encapsulate and cover the electronic components 190 on the second device mounting surface 131, preventing leakage.

[0026] In this scheme, the first encapsulation layer 140 and the second encapsulation layer 150 can encapsulate the electronic components on the corresponding device mounting surface, thereby preventing the electronic components 190 from being exposed, and thus improving the safety and reliability of the battery protection board 100.

[0027] Optionally, the first encapsulation layer 140 and the second encapsulation layer 150 can be coating structures. That is, after the device is mounted, the encapsulation layer is deposited on the device mounting surface using a coating method. Of course, the first encapsulation layer 140 and the second encapsulation layer 150 can also be injection molded structures. For example, after the device is mounted, the area corresponding to the battery protection board 100 is placed in an injection molding mechanism, and the injection molding mechanism injection molds the corresponding first encapsulation layer 140 and second encapsulation layer 150 on the first device mounting surface 121 and the second device mounting surface 131, respectively.

[0028] The first encapsulation layer 140 and the second encapsulation layer 150 mentioned above can be made of insulating materials such as plastic and rubber. Of course, the first encapsulation layer 140 and the second encapsulation layer 150 can also be made of other materials and other processes, which are not limited in this article.

[0029] In another alternative embodiment, the flexible circuit board 110 may include a main board segment 111 and a first extension segment 112, the first extension segment 112 extending from the edge of the main board segment 111, and the first extension segment 112 may have the aforementioned rigid board bonding area 1101. Here, the main board segment 111 can be used for electrical connection with the battery body 200; that is, the main board segment 111 can be located within the mounting area of ​​the battery body 200, while the first extension segment 112 extends from the edge of the main board segment 111, therefore the first extension segment 112 can be located outside the mounting area of ​​the battery body 200.

[0030] In this design, the rigid board bonding area 1101 is located on the first extension section 112. Therefore, the component area of ​​the battery protection board 100 can be placed outside the accommodating area of ​​the non-battery body 200. This allows the width of the part where the battery protection board 100 connects to the battery body 200 to be set smaller, thereby reducing the space occupied by the battery protection board 100 on the installation space of the battery body 200. This, in turn, helps to increase the volume of the battery body 200, thereby increasing the capacity of the battery body 200 and thus improving the performance of the battery module.

[0031] In another alternative embodiment, the first extension segment 112 may include a first region 112a and a second region 112b. The first region 112a can be connected to the main board segment 111 through the second region 112b. The first region 112a is the aforementioned rigid board bonding area 1101. In this case, the aforementioned first rigid circuit board 120 and second rigid circuit board 130 are disposed on opposite sides of the first region 112a.

[0032] In this design, the electronic component 190 is positioned far from the main board segment 111, thus avoiding the risk of interference between the electronic component 190 and the battery body 200.

[0033] Furthermore, the width of the first region 112a can be greater than the width of the second region 112b. In this scheme, the width of the first region 112a is larger, thus meeting the placement requirements of the electronic components 190, while setting the width of the second region 112b to be smaller can reduce the space occupied by the battery module layout.

[0034] In another alternative embodiment, the battery protection board 100 may further include an electrical connector 160, and the flexible circuit board 110 may further include a second extension 113. The second extension 113 extends from the edge of the first extension 111 or the edge of the first extension 112, and the second extension 113 may be provided with the electrical connector 160. The electrical connector 160 can be connected to the electrode lines and signal lines on the battery protection board 100, thereby enabling charging, discharging, and signal transmission. In this solution, the electrical connector 160 is disposed on the second extension 113, thereby avoiding the electrical connector 160 occupying space in the first extension 112, thus allowing the first extension 112 to reserve a larger layout area.

[0035] Optionally, the electrical connector 160 can be a gold finger, an electrical connection spring, a board-to-board connector, etc. Of course, the electrical connector 160 can also be other electrical connection structures, which are not limited in this article.

[0036] Furthermore, the number of second extension sections 113 can be at least two, with at least two second extension sections 113 spaced apart, and each second extension section 113 can be provided with an electrical connector 160. In this solution, the dual-sided or multi-sided wiring method adopted by the battery protection board 100 can further increase the current carrying capacity of the battery protection board 100.

[0037] In an alternative embodiment, the battery protection board 100 may further include a temperature detection unit, which may be located on the main board segment 111. The temperature detection unit is connected to the main board segment 111 and is used to detect and monitor the temperature of the battery body 200, thereby improving the safety performance of the battery module.

[0038] Optionally, the temperature detection unit can be a negative temperature coefficient thermistor, a positive temperature coefficient thermistor, or any other detection structure used for temperature detection. This paper does not limit the specific structure of the temperature detection unit. In this case, the specific structure and working principle of the temperature detection unit are well-known technologies and will not be elaborated upon here.

[0039] In the above scheme, due to the large volume of the battery body 200, it is difficult for a single temperature detection unit to comprehensively detect the temperature of the battery body 200.

[0040] Therefore, in another alternative solution, there can be multiple temperature detection units, namely a first temperature detection unit 171 and a second temperature detection unit 172, which can be spaced apart on the main board segment 111. In this solution, the first temperature detection unit 171 and the second temperature detection unit 172 can detect the temperature of the battery body 200 in separate zones, thus enabling more comprehensive detection of the temperature of the battery body 200 and further improving the safety and reliability of the battery module.

[0041] In another alternative embodiment, the battery protection board 100 may further include a reinforcing steel sheet 180, which is attached to one side of the main board segment 111. In this embodiment, the reinforcing steel sheet 180 can provide some reinforcement to the rigidity of the main board segment 111, avoiding the risk of large local deformation of the main board segment 111 and breakage of the tabs of the battery body 200.

[0042] Based on the battery protection board 100 of any of the above embodiments of this application, this application also discloses a battery module, and the disclosed battery module device includes the battery protection board 100 of any of the above embodiments.

[0043] The battery module disclosed in this application may further include a battery body 200 and a mounting bracket 300, the mounting bracket 300 providing a mounting base for other components of the battery. Simultaneously, the mounting bracket 300 also protects the components installed within it, thus ensuring the overall strength of the battery module. The mounting bracket 300 has a battery receiving slot 310.

[0044] The battery body 200 is located within the battery receiving slot 310. The battery body 200 is the energy storage component of the battery module, and includes, but is not limited to, components such as battery cells, tabs, tab sealant, and a plastic sealing film. The battery cell is the component of the battery body 200 used for energy storage and is part of the internal structure of the battery body 200. The plastic sealing film encapsulates the battery cell for protection. Tabs extend from the inside of the battery body 200 to the outside, originating from openings in the plastic sealing film. The openings in the plastic sealing film are sealed with tab sealant. The specific structure of the battery body 200 is known technology and is not limited herein.

[0045] A portion of the flexible circuit board is located within the battery receiving slot 310 and is connected to the battery body 200. The rigid board bonding area 1101 is located outside the battery receiving slot 310.

[0046] In this scheme, the electronic components 190 on the battery protection board 100 are placed externally in the area outside the battery receiving slot 310. Therefore, the width of the part of the battery protection board 100 located in the battery receiving slot 310 can be set to be smaller, thereby reducing the space occupied by the battery protection board 100 on the battery body 200. This is conducive to increasing the volume of the battery body 200, so as to increase the capacity of the battery body 200, and thus improve the performance of the battery module.

[0047] In another alternative embodiment, the mounting bracket 300 also has a circuit board receiving area 320 arranged parallel to the battery receiving slot 310. This circuit board receiving area 320 is used to receive the circuit board of the battery module. The orthographic projection of the rigid board bonding area 1101 is located within the circuit board receiving area 320 along a direction perpendicular to the circuit board receiving area 320. In this embodiment, the rigid board bonding area 1101 is located within the area that receives the circuit board, thus allowing the battery protection board 100 to be arranged within the area of ​​the mounting bracket 300 that receives the circuit board, allowing the rigid board bonding area 1101 to overlap with the circuit board, thereby reducing the overall size of the battery module.

[0048] The above embodiments of this utility model mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be described in detail here.

[0049] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A battery protection board, characterized in that, include: A flexible circuit board (110) has a rigid board bonding area (1101). A first rigid circuit board (120) and a second rigid circuit board (130) are respectively disposed on opposite sides of the rigid board bonding area (1101). The first rigid circuit board (120) has a first device mounting surface (121) on the side away from the flexible circuit board (110), and the second rigid circuit board (130) has a second device mounting surface (131) on the side away from the flexible circuit board (110). Both the first device mounting surface (121) and the second device mounting surface (131) are used to mount electronic components (190).

2. The battery protection board according to claim 1, characterized in that, The battery protection board (100) further includes a first encapsulation layer (140) and a second encapsulation layer (150), wherein the first encapsulation layer (140) covers the first device mounting surface (121) and the second encapsulation layer (150) covers the second device mounting surface (131).

3. The battery protection board according to claim 1, characterized in that, The flexible circuit board (110) includes a main board segment (111) and a first extension segment (112), the first extension segment (112) extending from the edge of the main board segment (111), and the first extension segment (112) having the rigid board bonding area (1101).

4. The battery protection board according to claim 3, characterized in that, The first extension segment (112) includes a first region (112a) and a second region (112b). The first region (112a) is connected to the main board segment (111) through the second region (112b). The first region (112a) is the rigid board bonding area (1101).

5. The battery protection board according to claim 4, characterized in that, The width of the first region (112a) is greater than the width of the second region (112b).

6. The battery protection board according to claim 3, characterized in that, The battery protection board (100) also includes an electrical connector (160), and the flexible circuit board (110) also includes a second extension (113), which extends from the edge of the main board segment (111) or the edge of the first extension (112), and the second extension (113) is provided with the electrical connector (160).

7. The battery protection board according to claim 6, characterized in that, The number of the second extension segments (113) is at least two, and the at least two second extension segments (113) are spaced apart, and each second extension segment (113) is provided with the electrical connector (160).

8. The battery protection board according to claim 3, characterized in that, The battery protection board (100) further includes a first temperature detection unit (171) and a second temperature detection unit (172), which are spaced apart on the main board segment (111).

9. The battery protection board according to claim 3, characterized in that, The battery protection board (100) also includes a reinforcing steel sheet (180), which is attached to the surface of one side of the main board segment (111).

10. A battery module, characterized in that, The device includes a battery body (200), a mounting bracket (300), and a battery protection board (100) according to any one of claims 1 to 9. The mounting bracket (300) has a battery receiving groove (310). The battery body (200) is located in the battery receiving groove (310). A portion of the flexible circuit board (110) is located in the battery receiving groove (310) and connected to the battery body (200). The rigid board bonding area (1101) is located outside the battery receiving groove (310).

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