Protection board assembly and battery

Abstract

This application relates to the field of battery structure, and in particular to a protection board assembly and a battery. The protection board assembly is used to connect a battery cell, and includes a flexible circuit board and a rigid circuit board. The flexible circuit board is connected to the tabs of the battery cell. The rigid circuit board has an embedding groove on its surface, and the embedding groove is opposite to the tabs. The surface of the flexible circuit board is connected to the surface of the rigid circuit board so that the tabs are placed within the embedding groove. The protection board assembly provided in this application, by providing an embedding groove on the rigid circuit board and placing the tabs within the embedding groove, requires a reduction in the thickness of the protection board assembly by subtracting the depth of the tabs embedded in the embedding groove. This reduces the thickness of the protection board assembly and consequently reduces the thickness of the battery head.

Description

Technical Field

[0001] This application relates to the field of battery structure, and in particular to a protection board assembly and a battery. Background Technology

[0002] In existing battery protection boards, printed circuit boards (PCBs) typically employ a flat rectangular design to accommodate the standardized layout requirements of battery modules. One side of the flexible circuit board needs to have pads for soldering to the PCB, while the other side has nickel strips for connecting the terminals. This structure significantly reduces the space required for component placement on the protection board, and after soldering, there is a risk of the battery head becoming excessively thick. Utility Model Content

[0003] The purpose of this application is to provide a protection board assembly and a battery to solve the problem of excessive thickness at the battery head.

[0004] This application provides a protection board assembly for connecting battery cells, the protection board assembly including a flexible circuit board and a rigid circuit board;

[0005] The flexible circuit board is connected to the electrode tab of the battery cell;

[0006] The rigid circuit board has an embedding groove on its surface, and the embedding groove is opposite to the tab; the surface of the flexible circuit board is connected to the surface of the rigid circuit board so that the tab is placed in the embedding groove.

[0007] In the above technical solution, the flexible circuit board is further provided with a connecting piece, which is connected to the electrode tab.

[0008] In the above technical solution, a connecting pad is further provided between the flexible circuit board and the rigid circuit board, and the connecting pad is misaligned with the embedding groove.

[0009] In the above technical solution, the number of the connecting pads is multiple, and the multiple connecting pads are spaced apart along the length direction of the rigid circuit board.

[0010] In the above technical solution, further, along the width direction of the rigid circuit board, the embedding groove penetrates the surface of the rigid circuit board.

[0011] In the above technical solution, the flexible circuit board has a first fabrication area on the surface opposite to the rigid circuit board.

[0012] The rigid circuit board has a second fabrication area on its surface opposite to that of the flexible circuit board.

[0013] In the above technical solution, the flexible circuit board further includes a first connecting portion and a second connecting portion;

[0014] At least a portion of the first connecting portion is positioned opposite the rigid circuit board, and the first fabric area is provided on the side of the first connecting portion away from the rigid circuit board;

[0015] The second connecting part is connected to the first connecting part, and the second connecting part is provided with a connector.

[0016] In the above technical solution, further, when the first connecting part is opposite to the position of the rigid circuit board, the end of the first connecting part away from the second connecting part is flush with the end of the rigid circuit board, and the end of the first connecting part near the second connecting part exceeds the preset length of the rigid circuit board and bends 180 degrees away from the rigid circuit board to form a gap.

[0017] One end of the second connection portion is connected to the portion of the first connection portion that extends beyond the rigid circuit board, and the other end of the second connection portion extends along the height direction of the battery cell and in a direction away from the battery cell.

[0018] In the above technical solution, the projection of the rigid circuit board on the first connection portion is opposite to the first fabric area;

[0019] The first fabric area is provided with a first device and a second device, the height of the first device is greater than the height of the second device, and the second device is located within the gap.

[0020] This application also provides a battery including the protection board assembly described above.

[0021] Compared with the prior art, the beneficial effects of this application are as follows:

[0022] The protection board assembly provided in this application has an embedding groove on a rigid circuit board, and the tab is placed in the embedding groove. At this time, the thickness of the protection board assembly needs to be reduced by the depth of the tab embedded in the embedding groove, so as to reduce the thickness of the protection board assembly and thus reduce the thickness of the battery head.

[0023] This application also provides a battery, including the protection board assembly described in the above solution. Based on the above analysis, it is clear that the battery also possesses the aforementioned beneficial effects, which will not be elaborated upon further here. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the structure of the protection plate assembly provided in this application;

[0026] Figure 2 A schematic diagram of the first structure of the flexible circuit board provided in this application;

[0027] Figure 3 A schematic diagram of the second structure of the flexible circuit board provided in this application;

[0028] Figure 4 A first structural schematic diagram of the rigid circuit board provided in this application;

[0029] Figure 5 This is a schematic diagram of the second structure of the rigid circuit board provided in this application.

[0030] In the figure: 101-Flexible circuit board; 102-Rigid circuit board; 103-Electrical tab; 104-Embedding groove; 105-Nickel sheet; 106-Connecting pad; 107-First component area; 108-Second component area; 109-First connection part; 110-Second connection part; 111-Gap; 112-First device; 113-Second device; 114-Connector. Detailed Implementation

[0031] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] Example 1

[0035] The protection board assembly provided in this application is used to connect the battery cells to achieve functions such as overcharge protection, over-discharge protection, overcurrent protection, and short circuit protection.

[0036] See Figures 1 to 5 As shown, the protection board assembly provided in this application includes a flexible circuit board 101 (FPC) and a rigid circuit board 102 (PCB); the flexible circuit board 101 is connected to the tab 103 of the battery cell; the rigid circuit board 102 has an embedded groove 104 on its surface, and the embedded groove 104 is opposite to the tab 103; the surface of the flexible circuit board 101 is connected to the surface of the rigid circuit board 102 so that the tab 103 is placed in the embedded groove 104.

[0037] Specifically, tab 103 is located between flexible circuit board 101 and rigid circuit board 102. One side of tab 103 is connected to flexible circuit board 101, thereby electrically connecting the battery cell to the protection board assembly. Tab 103 protrudes from the surface of flexible circuit board 101. Rigid circuit board 102 is located on the other side of tab 103, and rigid circuit board 102 has an embedding groove 104, the size of which is adapted to the size of tab 103. When the surface of flexible circuit board 101 is connected to the surface of rigid circuit board 102, flexible circuit board 101 covers the opening of embedding groove 104, and tab 103 is placed in embedding groove 104.

[0038] The thickness of the protection board assembly is determined by the thickness of the tab 103, the flexible circuit board 101, and the rigid circuit board 102. In the prior art, the thickness of the protection board assembly is the sum of the thicknesses of the tab 103, the flexible circuit board 101, and the rigid circuit board 102. In this application, an embedding groove 104 is provided on the rigid circuit board 102, and the tab 103 is placed in the embedding groove 104. In this case, the thickness of the protection board assembly needs to be reduced by the depth of the tab 103 embedded in the embedding groove 104, thereby reducing the thickness of the protection board assembly and thus reducing the thickness of the battery head.

[0039] When the depth of the embedding groove 104 is less than the thickness of the tab 103, the reduction in the thickness of the protective plate assembly is equal to the depth of the embedding groove 104. When the depth of the embedding groove 104 is greater than or equal to the thickness of the tab 103, the reduction in the thickness of the protective plate assembly is equal to the thickness of the tab 103.

[0040] In addition, the tab 103 is placed in the embedding groove 104, and the flexible circuit board 101 covers the opening of the embedding groove 104 and is connected to the tab 103. The embedding groove 104 can play a positioning role for the tab 103, preventing the tab 103 from loosening or falling off due to external vibration or impact, thus enhancing the stability of the connection.

[0041] In an optional embodiment, the flexible circuit board 101 is provided with a connecting piece, which is connected to the tab 103. Specifically, the connecting piece is a nickel sheet 105 provided on the flexible circuit board 101. The nickel sheet 105 has good electrical and thermal conductivity, as well as high mechanical strength and corrosion resistance, so as to ensure a reliable connection between the connecting piece and the tab 103.

[0042] In the optional schemes of this embodiment, see [link to relevant documentation]. Figure 2 and Figure 4 As shown, a connecting pad 106 is provided between the flexible circuit board 101 and the rigid circuit board 102, and the connecting pad 106 is offset from the embedding groove 104.

[0043] Specifically, there are multiple connection pads 106, and the multiple connection pads 106 are spaced apart along the length direction of the rigid circuit board 102.

[0044] In this embodiment, such as Figure 4 As shown, the rigid circuit board 102 has two mounting slots 104, which are respectively opposite to the positive and negative electrode tabs 103 of the battery cell, so that the positive and negative electrode tabs 103 are placed in the corresponding mounting slots 104. Connecting pads 106 are provided on both sides of the mounting slots 104 to allow the flexible circuit board 101 and the rigid circuit board 102 to be bonded together via the connecting pads 106. Figure 4 The groove edge length between the two embedded grooves 104 shown is relatively long, and a large number of connecting pads 106 are provided here, and the connecting pads 106 are equally spaced to ensure the reliability of the connection.

[0045] In an optional embodiment, a groove 104 is provided along the width direction of the rigid circuit board 102, penetrating the surface of the rigid circuit board 102.

[0046] In this embodiment, the tab 103 extends into the mounting groove 104 from one side of the rigid circuit board 102 in the width direction. The mounting groove 104 penetrates the surface of the rigid circuit board 102, and the tab 103 can be embedded into the mounting groove 104 regardless of its length. For example, when the length of the tab 103 is greater than the width of the rigid circuit board 102, the tab 103 can extend out of the mounting groove 104 from the other side of the rigid circuit board 102 in the width direction. The assembly of the tab 103 and the rigid circuit board 102 is not affected by the length of the tab 103, thereby improving the applicability of the device.

[0047] Example 2

[0048] The protection board assembly in this second embodiment is an improvement based on the above embodiments. The technical content disclosed in the above embodiments will not be described again, and the content disclosed in the above embodiments also belongs to the content disclosed in this second embodiment.

[0049] In an optional embodiment, since the surface on which the flexible circuit board 101 connects to the rigid circuit board 102 and the surface on which the flexible circuit board 101 connects to the tab 103 are the same surface, devices can also be arranged on the other side of the flexible circuit board 101. See Figure 3 and Figure 5 As shown, the flexible circuit board 101 has a first component placement area 107 on its surface away from the rigid circuit board 102, and the rigid circuit board 102 has a second component placement area 108 on its surface away from the flexible circuit board 101. That is, both the flexible circuit board 101 and the rigid circuit board 102 can be used to place components, which greatly increases the component placement space of the protection board assembly.

[0050] In an optional embodiment, the flexible circuit board 101 includes a first connecting portion 109 and a second connecting portion 110; at least a portion of the first connecting portion 109 is positioned opposite to the rigid circuit board 102, and a first fabrication area 107 is provided on the side of the first connecting portion 109 away from the rigid circuit board 102; the second connecting portion 110 is connected to the first connecting portion 109, and the second connecting portion 110 is provided with a connector 114, which is used to connect to the motherboard of the whole machine.

[0051] In an optional embodiment, when a portion of the first connecting portion 109 is positioned opposite the rigid circuit board 102, the end of the first connecting portion 109 away from the second connecting portion 110 is flush with the end of the rigid circuit board 102, and the end of the first connecting portion 109 near the second connecting portion 110 extends beyond a predetermined length of the rigid circuit board 102 and bends 180 degrees away from the rigid circuit board 102 to form a gap 111; one end of the second connecting portion 110 is connected to the portion of the first connecting portion 109 that extends beyond the rigid circuit board 102, and the other end of the second connecting portion 110 extends along the height direction of the battery cell and away from the battery cell.

[0052] In this embodiment, such as Figure 1 As shown, the length of the first connecting part 109 is longer than the length of the rigid circuit board 102, and the left end of the first connecting part 109 is flush with the end of the rigid circuit board 102. The right end of the first connecting part 109 extends beyond the rigid circuit board 102 and bends upward. The upwardly bent part has a movable margin, so that the connection between the first connecting part 109 and the rigid circuit board 102 will not be affected when it is pulled by external force, thereby reducing the installation difficulty.

[0053] In an optional embodiment, the projection of the rigid circuit board 102 onto the first connection portion 109 is opposite to the first fabrication area 107; the first fabrication area 107 is provided with a first device 112 and a second device 113, the height of the first device 112 is greater than the height of the second device 113, and the second device 113 is located within the gap 111. This structure can reduce the size of the protection board assembly in the battery height direction, so that the arrangement of the protection board assembly reduces its impact on the battery height.

[0054] Example 3

[0055] This application provides a battery in embodiment three, which includes the protection board assembly of any of the above embodiments. Therefore, it has all the beneficial technical effects of the protection board assembly of any of the above embodiments, which will not be repeated here.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application. In addition, those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are meant to be within the scope of this application and form different embodiments.

Claims

1. A protection board assembly for connecting battery cells, characterized in that, The protection board assembly includes a flexible circuit board and a rigid circuit board; The flexible circuit board is connected to the electrode tab of the battery cell; The rigid circuit board has an embedding groove on its surface, and the embedding groove is opposite to the tab; the surface of the flexible circuit board is connected to the surface of the rigid circuit board so that the tab is placed in the embedding groove.

2. The protection plate assembly according to claim 1, characterized in that, The flexible circuit board is provided with a connecting piece, which is connected to the electrode tab.

3. The protection plate assembly according to claim 1, characterized in that, A connecting pad is provided between the flexible circuit board and the rigid circuit board, and the connecting pad is misaligned with the embedding slot.

4. The protection plate assembly according to claim 3, characterized in that, The number of connection pads is multiple, and the multiple connection pads are spaced apart along the length direction of the rigid circuit board.

5. The protection plate assembly according to claim 1, characterized in that, Along the width direction of the rigid circuit board, the embedding groove extends through the surface of the rigid circuit board.

6. The protection plate assembly according to claim 1, characterized in that, The flexible circuit board has a first fabrication area on its surface opposite to the rigid circuit board. The rigid circuit board has a second fabrication area on its surface opposite to that of the flexible circuit board.

7. The protection plate assembly according to claim 6, characterized in that, The flexible circuit board includes a first connecting portion and a second connecting portion; At least a portion of the first connecting portion is positioned opposite the rigid circuit board, and the first fabric area is provided on the side of the first connecting portion away from the rigid circuit board; The second connecting part is connected to the first connecting part, and the second connecting part is provided with a connector.

8. The protection plate assembly according to claim 7, characterized in that, When the first connecting portion is positioned opposite the rigid circuit board, the end of the first connecting portion away from the second connecting portion is flush with the end of the rigid circuit board, and the end of the first connecting portion near the second connecting portion extends beyond the preset length of the rigid circuit board and bends 180 degrees away from the rigid circuit board to form a gap. One end of the second connection portion is connected to the portion of the first connection portion that extends beyond the rigid circuit board, and the other end of the second connection portion extends along the height direction of the battery cell and in a direction away from the battery cell.

9. The protection plate assembly according to claim 8, characterized in that, The projection of the rigid circuit board on the first connection portion is opposite to the first fabric area; The first fabric area is provided with a first device and a second device, the height of the first device is greater than the height of the second device, and the second device is located within the gap.

10. A battery, characterized in that, Includes the protective plate assembly as described in any one of claims 1 to 9.

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