battery pack

Abstract

This invention relates to the field of battery technology and proposes a battery pack comprising a flexible circuit board and at least two individual cells connected to the flexible circuit board. The flexible circuit board includes a main body and a signal acquisition unit connected to the main body and connected to the individual cells. The main body includes a bending member that forms multiple openings along the length of the flexible circuit board. The openings penetrate the flexible circuit board and intersect with its circumferential edge, such that each opening includes two opposing first openings and a second opening connected to the two first openings; wherein two adjacent second openings face opposite sides of the flexible circuit board. The bending member can also provide a buffer function, preventing the connection between the individual cells and the flexible circuit board from detaching, thereby ensuring the performance of the flexible circuit board and improving the safety of the battery pack.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery pack. Background Technology

[0002] In related technologies, flexible circuit boards can be used in battery packs. However, when the flexible circuit board is connected to the battery pack first and then installed into the housing, the connection between the flexible circuit board and the battery pack is prone to detachment when the battery pack is squeezed, which affects the normal use of the flexible circuit board. Summary of the Invention

[0003] This invention provides a battery pack to improve the performance of the battery pack.

[0004] The present invention provides a battery pack including a flexible circuit board and at least two individual cells connected to the flexible circuit board. The flexible circuit board includes a main body and a signal acquisition part. The signal acquisition part is connected to the main body and connected to the individual cells. The main body includes a bending member. Along the length direction of the flexible circuit board, the bending member forms a plurality of opening slots. The opening slots penetrate the flexible circuit board and intersect with the circumferential edge of the flexible circuit board, such that the opening slots include two opposing first openings and a second opening connected to the two first openings.

[0005] The two adjacent second openings face opposite sides of the flexible circuit board.

[0006] The battery pack of this invention includes a flexible circuit board and at least two individual cells electrically connected to the flexible circuit board. The flexible circuit board includes a main body and a signal acquisition unit connected to the main body. The flexible circuit board can acquire relevant signal information from the individual cells through the signal acquisition unit. By including a bending member in the main body, and the bending member forming multiple openings, the flexible circuit board can be positioned on the individual cells, and the bending member can also form a buffer function. Therefore, when the position of the individual cells is adjusted, the bending member itself can act as a buffer, thereby preventing the connection between the individual cells and the flexible circuit board from detaching. This ensures the performance of the flexible circuit board and improves the safe operation of the battery pack. Attached Figure Description

[0007] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures.

[0008] in:

[0009] Figure 1 This is a schematic diagram of the structure of a flexible circuit board according to an exemplary embodiment;

[0010] Figure 2 This is a partial structural schematic diagram of a flexible circuit board according to an exemplary embodiment;

[0011] Figure 3 This is a partial structural schematic diagram of a battery pack according to an exemplary embodiment;

[0012] Figure 4 This is a partial structural diagram of a battery pack according to an exemplary embodiment.

[0013] The annotations in the attached figures are explained as follows:

[0014] 10. Flexible circuit board; 11. Main body; 111. First segment; 112. Second segment; 113. Third segment; 12. Signal acquisition unit; 13. Opening slot; 131. First opening; 132. Second opening; 20. Single cell battery; 30. Conductive busbar; 31. Sub-conductive busbar; 40. Support; 41. Receiving slot. Detailed Implementation

[0015] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0016] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0017] Unless otherwise specified or indicated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0018] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of a reference to an element or feature being connected to another element(s) "upper," "lower," "inner," or "outer," it can be directly connected to the other element(s) "upper," "lower," "inner," or "outer," or indirectly connected to the other element(s) "upper," "lower," "inner," or "outer" through an intermediate element.

[0019] One embodiment of the present invention provides a battery pack, please refer to... Figures 1 to 4 The battery pack includes a flexible circuit board 10 and at least two individual batteries 20 connected to the flexible circuit board 10. The flexible circuit board 10 includes a main body 11 and a signal acquisition unit 12. The signal acquisition unit 12 is connected to the main body 11 and connected to the individual batteries 20. The main body 11 includes a bending member. Along the length direction of the flexible circuit board 10, the bending member forms a plurality of opening slots 13. The opening slots 13 penetrate the flexible circuit board 10 and intersect with the circumferential edge of the flexible circuit board 10, such that the opening slots 13 include two opposing first openings 131 and a second opening 132 connected to the two first openings 131; wherein, two adjacent second openings 132 face opposite sides of the flexible circuit board.

[0020] One embodiment of the battery pack of the present invention includes a flexible circuit board 10 and at least two individual cells 20 electrically connected to the flexible circuit board 10. The flexible circuit board 10 includes a main body 11 and a signal acquisition unit 12, which is connected to the main body 11. The flexible circuit board 10 can acquire relevant signal information of the individual cells 20 through the signal acquisition unit 12. By including a bending member in the main body 11, and the bending member forming a plurality of openings 13, the bending member can also form a buffer function while ensuring that the flexible circuit board 10 can be disposed on the individual cells 20. Thus, when the position of the individual cells 20 is adjusted, the bending member itself can form a buffer, thereby preventing the connection between the individual cells 20 and the flexible circuit board 10 from detaching, thereby ensuring the performance of the flexible circuit board 10 and improving the safe use performance of the battery pack.

[0021] It should be noted that multiple individual cells 20 can form a battery assembly. The flexible circuit board 10 includes a main body 11 and a signal acquisition unit 12. The main body 11 can be disposed on the battery assembly. The flexible circuit board 10 can electrically connect at least two individual cells 20. The flexible circuit board 10 can be directly or indirectly disposed on the individual cells 20. For example, the battery assembly may include a support 40, and the flexible circuit board 10 can be fixed to the support 40. The signal acquisition unit 12 can be connected to the battery assembly. For example, the signal acquisition unit 12 can be used to acquire temperature information of the individual cells, or it can be used to acquire voltage information of the individual cells, etc., without limitation. At least a portion of the signal acquisition unit 12 can be a metal sheet, for example, at least a portion of the signal acquisition unit 12 can be a nickel sheet.

[0022] The main body 11 includes a bending member. Along the length of the flexible circuit board 10, the bending member forms multiple openings 13. Due to the presence of the bending member, the main body 11 can form a buffer. For example, the size of the openings 13 can be varied, allowing the position of some segments of the main body 11 to be adjusted, thereby enabling the main body 11 to have a buffering function. For example, after the main body 11 is connected to the battery assembly, the bottom segment forming the opening 13 is connected to the battery assembly. When the battery assembly is compressed and shortened or expanded and length increased, the side segments forming the opening 13 can be repositioned, i.e., the main body 11 has a buffering function. This prevents the bottom segment of the opening 13 from detaching from the connection with the battery assembly, thereby ensuring that the flexible circuit board 10 can be stably connected to the battery assembly and reducing the risk of the signal acquisition unit 12 detaching from the connection with the battery assembly. The inclusion of a bending member in the main body 11 does not specifically mean that the main body 11 is formed by bending.

[0023] Combination Figure 1 As shown, the length direction of the flexible circuit board 10 can be represented as A. Here, we do not consider the specific structural formation of the flexible circuit board 10, but mainly focus on the overall length trend of the flexible circuit board 10. Therefore, the length direction of the flexible circuit board 10 can still be considered as a straight line. Correspondingly, the width direction of the flexible circuit board 10 can be represented as B.

[0024] Combination Figure 2As shown, the opening groove 13 includes two opposing first openings 131 and a second opening 132 connected to the two first openings 131. That is, the main body 11 has a certain thickness. When the main body 11 is formed into a bent part, the main body 11 has two opposing first openings 131 in the thickness direction. That is, the main body 11 has two first openings 131 on opposite sides. The opening groove 13 also includes a second opening 132. The opening groove 13 includes three openings, which allows the main body 11 to be buffered. The opening groove 13 can also be used to avoid other structures. For example, the opening groove 13 can be used to avoid conductive parts.

[0025] Combination Figure 2 As shown, the two second openings 132 of two adjacent opening slots 13 face opposite sides of the flexible circuit board 10 respectively. For example, one second opening 132 may face downwards, while the other second opening 132 may face upwards.

[0026] The opening groove 13 extends through the flexible circuit board 10, that is, the opening groove 13 extends through the thickness direction of the flexible circuit board 10. Therefore, the opening groove 13 includes two opposing first openings 131. The opening groove 13 intersects with the circumferential edge of the flexible circuit board 10. Therefore, the opening groove 13 further includes a second opening 132.

[0027] In one embodiment, the opening slot 13 corresponds to the signal acquisition unit 12, such that at least a portion of the orthographic projection of the signal acquisition unit 12 toward the plane where the first opening 131 is located is located within the first opening 131. This not only facilitates the installation of the signal acquisition unit 12, but also facilitates the subsequent connection of the signal acquisition unit 12 to the battery assembly. Furthermore, when the bending member is used to achieve buffering, the signal acquisition unit 12 is less likely to be pulled, thereby improving the safe operation performance of the signal acquisition unit 12.

[0028] In one embodiment, the entire orthographic projection of the signal acquisition unit 12 toward the plane where the first opening 131 is located can be located within the first opening 131. For example, one end of the signal acquisition unit 12 can be in contact with the wall of the opening slot 13.

[0029] In one embodiment, the portion of the signal acquisition unit 12 projected onto the plane of the first opening 131 is located within the first opening 131, thereby allowing a portion of the signal acquisition unit 12 to overlap with the main body 11, which can improve the connection strength between the signal acquisition unit 12 and the main body 11.

[0030] In one embodiment, there are multiple signal acquisition units 12, and each opening slot 13 corresponds to a signal acquisition unit 12, so that the signal acquisition unit 12 can be used to acquire multiple signals.

[0031] The types of multiple signal acquisition units 12 can all be the same. For example, multiple signal acquisition units 12 can all be used to acquire temperature information, or multiple signal acquisition units 12 can all be used to acquire voltage information; or, the types of multiple signal acquisition units 12 can be different. For example, some signal acquisition units 12 can be used to acquire temperature information, while others can be used to acquire voltage information.

[0032] In one embodiment, the number of signal acquisition units 12 is greater than the number of opening slots 13, thereby improving the signal acquisition capability of the signal acquisition units 12.

[0033] The outer side of the opening slot 13 may also have a signal acquisition unit 12, or, in some embodiments, it is not excluded that a single opening slot 13 may have multiple signal acquisition units 12.

[0034] In one embodiment, combined Figure 1 As shown, the number of signal acquisition units 12 is two more than the number of opening slots 13. Each opening slot 13 can correspond to one signal acquisition unit 12, and the outer side of the opening slot 13 can also have a signal acquisition unit 12. For example, along the length direction of the flexible circuit board 10, a signal acquisition unit 12 can be provided at each of the two edge positions of the main body 11.

[0035] In one embodiment, the opening slot 13 is a U-shaped slot, which can improve the buffering capacity of the body 11 and give the body 11 a relatively large clearance space, thereby improving the usability of the flexible circuit board 10. For example, the opening slot 13 can be used to avoid conductive parts.

[0036] The opening groove 13 is a U-shaped groove. The opening groove 13 may have two opposing side walls and a bottom wall. Therefore, the opening groove 13 may include two opposing first openings 131 and a second opening 132 connected to the two first openings 131.

[0037] It should be noted that the opening groove 13 is a U-shaped groove. The U-shaped groove here can be approximately U-shaped, or the opening groove 13 can be a rectangular groove, or the opening groove 13 can be a trapezoidal groove. For example, the length of the bottom surface of the trapezoidal groove can be greater than the length of the second opening 132, or the length of the bottom surface of the trapezoidal groove can be less than the length of the second opening 132.

[0038] In some embodiments, the opening groove 13 may also be a V-shaped groove.

[0039] In one embodiment, such as Figure 1As shown, the main body 11 includes: a plurality of first segments 111, which are spaced apart along the length direction of the flexible circuit board 10; a plurality of second segments 112, which are spaced apart along the length direction of the flexible circuit board 10, and the second segments 112 and the first segments 111 are spaced apart along the width direction of the flexible circuit board 10; and a plurality of third segments 113, which are spaced apart along the length direction of the flexible circuit board 10, and the opposite ends of the third segments 113 are respectively connected to the adjacent first segments 111 and second segments 112; wherein, the first segment 111 and the two third segments 113 connected to its opposite ends form an opening groove 13, and the second segment 112 and the two third segments 113 connected to its opposite ends form an opening groove 13.

[0040] Multiple first segments 111, multiple second segments 112, and multiple third segments 113 can form multiple openings 13. Two third segments 113 connected to opposite ends of a first segment 111 can change position relative to the first segment 111. For example, the two third segments 113 can expand outwards relative to the first segment 111, or the two third segments 113 can expand inwards relative to the first segment 111. In this case, the main body 11 has a buffering function. Similarly, two third segments 113 connected to opposite ends of a second segment 112 can change position relative to the second segment 112. For example, the two third segments 113 can expand outwards relative to the second segment 112, or the two third segments 113 can expand inwards relative to the second segment 112. In this case, the main body 11 has a buffering function.

[0041] In one embodiment, the number of first segments 111 is equal to the number of second segments 112, and the sum of the number of first segments 111 and the number of second segments 112 is two more than the number of opening slots 13. This allows the flexible circuit board 10 to have first segments 111 and second segments 112 at opposite ends along its length, such as... Figure 1 As shown.

[0042] In one embodiment, multiple third segments 113 are arranged in parallel, thereby making the enclosed opening groove 13 a U-shaped groove. This not only has a relatively simple structure and provides a large clearance space, but also facilitates the forming of the flexible circuit board 10.

[0043] Combination Figure 1 As shown, multiple first segments 111 are arranged sequentially along the length direction of the flexible circuit board 10, multiple second segments 112 are arranged sequentially along the length direction of the flexible circuit board 10, and the first segments 111 and the second segments 112 are spaced apart in the width direction of the flexible circuit board 10, and the opposite ends of the third segment 113 can be connected to the first segments 111 and the second segments 112 respectively.

[0044] In one embodiment, each first segment 111 is connected to a signal acquisition unit 12, and each second segment 112 is connected to a signal acquisition unit 12, thereby improving the acquisition capability of the signal acquisition unit 12 and thus improving the signal acquisition capability of the flexible circuit board 10.

[0045] In one embodiment, the battery pack further includes a battery assembly, in which multiple individual cells 20 can form a battery assembly. A flexible circuit board 10 is disposed on the battery assembly, and a signal acquisition unit 12 is connected to the battery assembly, thereby reliably disposing the flexible circuit board 10 on the battery assembly and facilitating the signal acquisition unit 12 to acquire temperature or voltage information of the battery assembly.

[0046] In one embodiment, such as Figure 4 As shown, the battery assembly includes multiple individual cells 20 and a conductive bus 30. The conductive bus 30 electrically connects at least two individual cells 20, thereby enabling the individual cells 20 to be connected in series or in parallel.

[0047] At least a portion of the orthographic projection of the conductive busbar 30 toward the plane containing the first opening 131 is located within the first opening 131, meaning that the opening slot 13 can be used to avoid the conductive busbar 30, thereby facilitating the installation of the flexible circuit board 10 and improving the space utilization of the battery pack.

[0048] It should be noted that the single-cell battery 20 includes a cell and an electrolyte, and is the smallest unit capable of electrochemical reactions such as charging / discharging. A cell refers to a unit formed by winding or laminating stacked portions, which includes a first electrode, a separator, and a second electrode. When the first electrode is the positive electrode, the second electrode is the negative electrode. The polarities of the first and second electrodes can be interchanged.

[0049] In some embodiments, the single cell 20 can be a second square cell, that is, the cell can be a square cell, and the square cell can be a quadrangular prism cell. The quadrangular prism cell mainly refers to a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in a strict sense, and the corners between the sides are not necessarily right angles, but can be rounded.

[0050] The single cell 20 can be a stacked cell, which is not only convenient for assembly, but also allows for the production of longer cells. Specifically, the cell is a stacked cell, which has a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator between the first and second electrodes, thereby stacking multiple pairs of first and second electrodes to form a stacked cell.

[0051] Alternatively, the single cell 20 can be a wound cell, in which the first electrode, the second electrode with the opposite electrical charge to the first electrode, and the separator disposed between the first electrode and the second electrode are wound together to obtain a wound cell.

[0052] In some embodiments, the single cell 20 can be a cylindrical cell. The single cell can be a wound cell, in which a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator disposed between the first and second electrodes are wound together to obtain a wound cell.

[0053] In one embodiment, the entire orthographic projection of the conductive bus 30 toward the plane containing the first opening 131 may lie within the first opening 131. Alternatively, a portion of the orthographic projection of the conductive bus 30 toward the plane containing the first opening 131 may lie within the first opening 131.

[0054] In one embodiment, such as Figure 4 As shown, the conductive busbar 30 includes multiple sub-conductive busbars 31, which are spaced apart along the length of the flexible circuit board 10. The sub-conductive busbars 31 are electrically connected to two individual batteries 20. Each opening slot 13 corresponds to a sub-conductive busbar 31, which facilitates the setting of the sub-conductive busbars 31 and avoids interference between the flexible circuit board 10 and the sub-conductive busbars 31, thereby improving the safe operation of the battery pack.

[0055] In one embodiment, the number of sub-conducting busbars 31 can be equal to the number of opening slots 13. In this case, the entire orthographic projection of the conductive busbar 30 toward the plane where the first opening 131 is located can be located within the first opening 131. That is, each opening slot 13 corresponds to a sub-conducting busbar 31, and the entire orthographic projection of each sub-conducting busbar 31 toward the plane where the first opening 131 is located can be located within the first opening 131. In other words, each opening slot 13 can be used to avoid a sub-conducting busbar 31.

[0056] In one embodiment, the number of sub-conducting busbars 31 is greater than the number of opening slots 13, thereby reducing the material used in the flexible circuit board 10 and ensuring that there are enough individual cells 20 to guarantee the capacity of the battery pack.

[0057] The number of sub-conducting busbars 31 is greater than the number of opening slots 13. At this time, the portion of the conductive busbar 30 projected onto the plane where the first opening 131 is located can be located inside the first opening 131. That is, each opening slot 13 corresponds to a sub-conducting busbar 31, and the outer side of the opening slot 13 can have at least one sub-conducting busbar 31. At this time, the projected portion of the sub-conducting busbar 31 located outside the opening slot 13 onto the plane where the first opening 131 is located is outside the first opening 131.

[0058] The number of sub-conducting busbars 31 can be two more than the number of opening slots 13. For example, the sum of the number of first segments 111 and the number of second segments 112 is two more than the number of opening slots 13, and the number of first segments 111 and the number of second segments 112 can each correspond to one sub-conducting busbar 31.

[0059] In one embodiment, the signal acquisition unit 12 is connected to the busbar 30, thereby enabling it to acquire temperature or voltage information on the busbar 30.

[0060] It should be noted that the signal acquisition unit 12 can also be connected to the single cell battery 20. For example, the signal acquisition unit 12 can contact the terminal assembly of the single cell battery 20.

[0061] In one embodiment, the main body 11 is thermally fused to the battery assembly, which not only facilitates the connection of the main body 11 but also improves the connection stability of the main body 11.

[0062] The main body 11 may have multiple thermally fused connection points with the battery assembly. For example, each first segment 111 and each second segment 112 may be thermally fused to the battery assembly. In this case, the number of thermally fused connection points between the main body 11 and the battery assembly may be equal to the sum of the number of first segments 111 and the number of second segments 112; or, the number of thermally fused connection points between the main body 11 and the battery assembly may be less than the sum of the number of first segments 111 and the number of second segments 112; or, the number of thermally fused connection points between the main body 11 and the battery assembly may be greater than the sum of the number of first segments 111 and the number of second segments 112.

[0063] The main body 11 can be thermally fused to the single cell 20. The main body 11 can be directly thermally fused to the single cell 20, or the main body 11 can be thermally fused to the single cell 20 through other structures.

[0064] In one embodiment, such as Figure 3 and Figure 4 As shown, the battery pack has a receiving groove 41, that is, the battery assembly has a receiving groove 41. At least a portion of the flexible circuit board 10 is located in the receiving groove 41. This not only enables reliable fixation of the flexible circuit board 10 and facilitates the installation of the flexible circuit board 10, but also provides installation space for the flexible circuit board 10, thereby improving the space utilization of the battery pack.

[0065] In one embodiment, such as Figure 4As shown, the battery pack also includes a bracket 40, on which the individual battery 20 is disposed. The bracket 40 has a receiving groove 41, and the main body 11 is thermally fused to the bracket 40. The bracket 40 can not only fix the individual battery 20, facilitating the assembly of the individual battery 20, but also facilitate the placement of the flexible circuit board 10 on the bracket 40, thereby avoiding damage to the flexible circuit board 10.

[0066] It should be noted that a bracket 40 can be equipped with multiple individual batteries 20, or there can be multiple brackets 40, with each bracket 40 corresponding to one individual battery 20.

[0067] In one embodiment, the conductive bar 30 is not protruding from the side of the main body 11 away from the battery assembly, and the conductive bar 30 is not protruding from the side of the main body 11 away from the individual battery 20. This avoids increasing the space of the battery pack by the main body 11 and also avoids damage to the main body 11 by other external structures, thereby improving the safe use performance of the flexible circuit board 10.

[0068] It should be noted that the battery pack can be a battery module or a battery pack.

[0069] The battery module includes multiple individual cells 20. The battery module may also include end plates and side plates for fixing the multiple individual cells 20.

[0070] It should be noted that multiple individual cells 20 can be assembled into a battery module and then placed inside the battery case. Multiple individual cells 20 can be fixed using end plates and side plates. Alternatively, multiple individual cells 20 can be directly placed inside the battery case, eliminating the need to group them together; in this case, the end plates and side plates can be removed. When the individual cell 20 is a cylindrical cell, it can be assembled into a battery module using a support plate.

[0071] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0072] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A battery pack, characterized in that, The device includes a flexible circuit board (10) and at least two individual batteries (20) connected to the flexible circuit board (10). The flexible circuit board (10) includes a main body (11) and a signal acquisition unit (12). The signal acquisition unit (12) is connected to the main body (11) and connected to the individual batteries (20). The main body (11) includes a bending member. Along the length direction of the flexible circuit board (10), the bending member forms a plurality of opening slots (13). The opening slots (13) penetrate the flexible circuit board (10) and intersect with the circumferential edge of the flexible circuit board (10), such that the opening slots (13) include two opposing first openings (131) and a second opening (132) connected to the two first openings (131). The two adjacent second openings (132) face opposite sides of the flexible circuit board (10); The main body (11) includes a first segment (111) and a plurality of third segments (113). The plurality of third segments (113) are spaced apart along the length direction of the flexible circuit board (10). The two ends of the first segment (111) are respectively connected to two adjacent third segments (113) to form the opening groove (13). The opening slot (13) corresponds to the signal acquisition unit (12). At least a portion of the orthographic projection of the signal acquisition unit (12) toward the plane where the first opening (131) is located is located within the first opening (131), and the end of the signal acquisition unit (12) does not extend beyond the second opening (132).

2. The battery pack according to claim 1, characterized in that, The portion of the signal acquisition unit (12) that is projected onto the plane of the first opening (131) is located within the first opening (131).

3. The battery pack according to claim 1 or 2, characterized in that, There are multiple signal acquisition units (12), and each of the opening slots (13) corresponds to a signal acquisition unit (12).

4. The battery pack according to claim 3, characterized in that, The number of signal acquisition units (12) is greater than the number of opening slots (13); The number of signal acquisition units (12) is two more than the number of opening slots (13).

5. The battery pack according to claim 1, characterized in that, The opening groove (13) is a U-shaped groove.

6. The battery pack according to claim 1, characterized in that, The main body (11) also includes: A plurality of first segments (111) are spaced apart along the length direction of the flexible circuit board; A plurality of second segments (112) are spaced apart along the length direction of the flexible circuit board, and the second segments (112) and the first segment (111) are spaced apart along the width direction of the flexible circuit board. The two ends of the third segment (113) are respectively connected to the adjacent first segment (111) and second segment (112); The second segment (112) and the two third segments (113) connecting their opposite ends form the opening groove (13).

7. The battery pack according to claim 6, characterized in that, The number of the first segment (111) is equal to the number of the second segment (112), and the sum of the number of the first segment (111) and the number of the second segment (112) is two more than the number of the opening slots (13).

8. The battery pack according to claim 6, characterized in that, Multiple third segments (113) are arranged in parallel, and / or each first segment (111) is connected to the signal acquisition unit (12), and each second segment (112) is connected to the signal acquisition unit (12).

9. The battery pack according to claim 1, characterized in that, The battery pack also includes a conductive bus (30) that electrically connects at least two of the individual cells (20); At least a portion of the orthographic projection of the conductive bus (30) toward the plane containing the first opening (131) is located within the first opening (131).

10. The battery pack according to claim 9, characterized in that, The portion of the conductive bus (30) projected onto the plane of the first opening (131) is located within the first opening (131).

11. The battery pack according to claim 9, characterized in that, The signal acquisition unit (12) is connected to the conductive bus (30).

12. The battery pack according to claim 9, characterized in that, The battery pack has a receiving groove (41) in which at least a portion of the flexible circuit board is located.

13. The battery pack according to claim 12, characterized in that, The battery pack also includes a bracket (40), the individual battery (20) is disposed on the bracket (40), the bracket (40) has a receiving groove (41), and the main body (11) is thermally fused to the bracket (40).

14. The battery pack according to any one of claims 9 to 13, characterized in that, The main body (11) is disposed away from the conductive bus (30) on the side away from the single cell (20).

Images