CN220368109U - Battery pack - Google Patents

Abstract

The utility model relates to the technical field of batteries and provides a battery pack, which comprises a flexible circuit board and at least two single batteries connected with the flexible circuit board, wherein the flexible circuit board comprises a main body and a signal acquisition part, the signal acquisition part is connected to the main body, the signal acquisition part is connected with the single batteries, the main body comprises a bending piece, a plurality of open slots are formed by surrounding the bending piece along the length direction of the flexible circuit board, and the open slots penetrate through the flexible circuit board and intersect with the circumferential edge of the flexible circuit board, so that the open slots comprise two first openings which are opposite and a second opening which is connected with the two first openings; wherein, two adjacent second openings face the opposite sides of the flexible circuit board respectively. The bending piece can be further provided with a buffer function, and the bending piece can form buffer, so that separation of the connection part between the single battery and the flexible circuit board is avoided, the service performance of the flexible circuit board can be ensured, and the safety service performance of the battery pack is improved.

Description

Battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack.

Background

In the related art, the flexible circuit board can be applied to the battery pack, especially when the flexible circuit board is connected with the battery assembly firstly and then is arranged in the box body, the connection part of the flexible circuit board and the battery assembly is easy to break away when the battery assembly is extruded, so that the normal use of the flexible circuit board is influenced.

Disclosure of Invention

The utility model provides a battery pack to improve the service performance of the battery pack.

The utility model provides a battery pack, which comprises a flexible circuit board and at least two single batteries connected with the flexible circuit board, wherein the flexible circuit board comprises a main body and a signal acquisition part, the signal acquisition part is connected to the main body, the signal acquisition part is connected with the single batteries, the main body comprises a bending piece, a plurality of open slots are formed by surrounding the bending piece along the length direction of the flexible circuit board, and the open slots penetrate through the flexible circuit board and intersect with the circumferential edge of the flexible circuit board, so that the open slots comprise two first openings which are opposite and a second opening which is connected with the two first openings;

wherein, two adjacent second openings face the opposite sides of the flexible circuit board respectively.

The battery pack comprises a flexible circuit board and at least two single batteries electrically connected with the flexible circuit board, wherein the flexible circuit board comprises a main body and a signal acquisition part, the signal acquisition part is connected to the main body, and the flexible circuit board can acquire relevant signal information of the single batteries through the signal acquisition part. Through making the main part include buckling piece to buckling piece encloses into and has a plurality of open slots, guarantees that flexible circuit board can set up on the basis of battery cell, buckling piece still can be formed with buffer function, thereby when the position adjustment takes place for battery cell, buckling piece itself can form the buffering, from this avoids the junction between battery cell and the flexible circuit board to appear breaking away from, thereby can guarantee flexible circuit board's performance, from this the safe performance of improving the group battery.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views.

Wherein:

fig. 1 is a schematic diagram of a flexible circuit board according to an exemplary embodiment;

FIG. 2 is a schematic diagram of a partial structure of a flexible circuit board according to an exemplary embodiment;

fig. 3 is a partial structure diagram of a battery pack according to an exemplary embodiment;

fig. 4 is a partial schematic structure of a battery pack according to an exemplary embodiment.

The reference numerals are explained as follows:

10. a flexible circuit board; 11. a main body; 111. a first section; 112. a second section; 113. a third section; 12. a signal acquisition unit; 13. an open slot; 131. a first opening; 132. a second opening; 20. a single battery; 30. a conductive bar; 31. a sub-conductive row; 40. a bracket; 41. an accommodating groove.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

Referring to fig. 1 to 4, an embodiment of the present utility model provides a battery pack, the battery pack includes a flexible circuit board 10 and at least two unit cells 20 connected to the flexible circuit board 10, the flexible circuit board 10 includes a main body 11 and a signal acquisition portion 12, the signal acquisition portion 12 is connected to the main body 11, the signal acquisition portion 12 is connected to the unit cells 20, the main body 11 includes a bending member, and a plurality of open slots 13 are defined along a length direction of the flexible circuit board 10 by the bending member, the open slots 13 penetrate the flexible circuit board 10 and intersect a circumferential edge of the flexible circuit board 10 such that the open slots 13 include two first openings 131 opposite to each other 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, respectively.

The battery pack according to an embodiment of the present utility model includes a flexible circuit board 10 and at least two unit cells 20 electrically connected to the flexible circuit board 10, the flexible circuit board 10 includes a main body 11 and a signal collection part 12, the signal collection part 12 is connected to the main body 11, and the flexible circuit board 10 can collect relevant signal information of the unit cells 20 through the signal collection part 12. Through making main part 11 include buckling piece to buckling piece encloses into and has a plurality of open slots 13, guarantees that flexible circuit board 10 can set up on cell 20's basis, buckling piece can also be formed with buffer function, thereby when cell 20 takes place the position adjustment, buckling piece itself can form the buffering, from this avoids cell 20 and flexible circuit board 10 between junction to appear breaking away from, thereby can guarantee flexible circuit board 10's performance, from this improves the safe performance of group battery.

It should be noted that, the plurality of unit cells 20 may form a battery assembly, the flexible circuit board 10 includes a main body 11 and a signal collecting portion 12, the main body 11 may be used to be disposed on the battery assembly, the flexible circuit board 10 may be directly or indirectly disposed on the unit cells 20, for example, the battery assembly may include a bracket 40, the flexible circuit board 10 may be fixed on the bracket 40, and the signal collecting portion 12 may be used to be connected to the battery assembly, for example, the signal collecting portion 12 may be used to collect temperature information of the unit cells, or the signal collecting portion 12 may be used to collect voltage information of the unit cells, etc., which is not limited herein. At least part of the signal acquisition portion 12 may be a metal sheet, for example, at least part of the signal acquisition portion 12 may be a nickel sheet.

The main body 11 includes a bending member, and a plurality of open slots 13 are formed around the bending member along the length direction of the flexible circuit board 10, and due to the bending member, the main body 11 can form a buffer, for example, the size of the open slot 13 can be changed, so that the position of a part of the body 11 can be adjusted, and thus the main body 11 can have a buffer function, for example, after the main body 11 is connected to a battery assembly, the bottom part of the body forming the open slot 13 is connected to the battery assembly, and when the battery assembly is shortened in extrusion length or increased in expansion length, the side part of the body forming the open slot 13 can be adjusted, that is, the main body 11 has a buffer function, thereby avoiding the separation of the connection part of the bottom part of the open slot 13 and the battery assembly, so that the flexible circuit board 10 can be stably connected to the battery assembly, and the risk of the separation of the connection part of the signal acquisition part 12 and the battery assembly can be reduced. The body 11 includes a bending piece, and it is not particularly limited that the body 11 is formed by bending.

As shown in fig. 1, the length direction of the flexible circuit board 10 may be denoted as a, and the specific structure of the flexible circuit board 10 is not considered herein, and the overall length trend of the flexible circuit board 10 is mainly considered, so the length direction of the flexible circuit board 10 may still be considered as a straight line direction. Accordingly, the width direction of the flexible circuit board 10 may be denoted as B.

As shown in fig. 2, the open slot 13 includes two opposite 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, and when the main body 11 forms a bending member, the main body 11 has two opposite first openings 131 in the thickness direction, that is, two opposite sides of the main body 11 have two first openings 131, and the open slot 13 further includes a second opening 132, and the open slot 13 includes three openings, so that the main body 11 can be buffered, and the open slot 13 can also be used for avoiding other structures, for example, the open slot 13 can be used for avoiding a conductive member.

As shown in connection with fig. 2, two second openings 132 of two adjacent open grooves 13 are directed toward opposite sides of the flexible circuit board 10, respectively, for example, one second opening 132 may be directed downward and the other second opening 132 may be directed upward.

The open groove 13 penetrates the flexible circuit board 10, that is, the open groove 13 penetrates the flexible circuit board 10 in the thickness direction, and thus the open groove 13 includes two first openings 131 opposing each other. And the open slot 13 intersects the peripheral edge of the flexible circuit board 10, the open slot 13 thus further includes a second opening 132.

In one embodiment, the open slot 13 corresponds to the signal collecting portion 12, so that at least a portion of the orthographic projection of the signal collecting portion 12 on the plane where the first opening 131 is located in the first opening 131, not only can the setting of the signal collecting portion 12 be facilitated, but also the connection between the subsequent signal collecting portion 12 and the battery assembly can be facilitated, and when the bending piece is used for realizing buffering, the signal collecting portion 12 is not easily pulled, so that the safety usability of the signal collecting portion 12 can be improved.

In one embodiment, all of the orthographic projection of the signal collecting portion 12 toward the plane of the first opening 131 may be located in the first opening 131, for example, one end of the signal collecting portion 12 may be butted against the wall surface of the open slot 13.

In one embodiment, the orthographic projection portion of the signal collecting portion 12 facing the plane of the first opening 131 is located in the first opening 131, so that the portion of the signal collecting portion 12 may be overlapped with the main body 11, and the connection strength between the signal collecting portion 12 and the main body 11 can be improved.

In one embodiment, the signal collecting parts 12 are plural, and each of the open grooves 13 corresponds to the signal collecting part 12, so that the signal collecting part 12 can be used for collecting plural signals.

The types of the plurality of signal collection portions 12 may be identical, for example, the plurality of signal collection portions 12 may be all used to collect temperature information, or the plurality of signal collection portions 12 may be all used to collect voltage information; alternatively, the types of the plurality of signal acquisition units 12 may not be identical, for example, some signal acquisition units 12 may be used to acquire temperature information and other signal acquisition units 12 may be used to acquire voltage information.

In one embodiment, the number of signal collection portions 12 is greater than the number of open slots 13, so that the signal collection capability of the signal collection portions 12 can be improved.

The outside of the open slot 13 may also have signal acquisition portions 12 or, in some embodiments, it is not excluded that one open slot 13 may have a plurality of signal acquisition portions 12 therein.

In one embodiment, as shown in fig. 1, the number of signal collecting parts 12 is two more than the number of open grooves 13, each open groove 13 may correspond to one signal collecting part 12, and the outside of the open groove 13 may also have signal collecting parts 12, for example, one signal collecting part 12 may be provided at each of two edge positions of the main body 11 along the length direction of the flexible circuit board 10.

In one embodiment, the open slot 13 is a U-shaped slot, which may improve the cushioning ability of the body 11, and may allow the body 11 to have a relatively large relief space, which may improve the usability of the flexible circuit board 10, for example, the open slot 13 may be used to relieve conductive members.

The open slot 13 is a U-shaped slot, and the open slot 13 may have two opposite side walls and a bottom wall, so that the open slot 13 may include two opposite first openings 131 and a second opening 132 connected to the two first openings 131.

It should be noted that, the open slot 13 is a U-shaped slot, where the U-shaped slot may be a substantially U-shaped slot, or the open slot 13 may be a rectangular slot, or the open slot 13 may be a trapezoid slot, for example, a bottom surface length of the trapezoid slot may be greater than a length of the second opening 132, or a bottom surface length of the trapezoid slot may be less than a length of the second opening 132.

In some embodiments, the open slot 13 may also be a V-shaped slot.

In one embodiment, as shown in fig. 1, the body 11 includes: a plurality of first segments 111, the plurality of first segments 111 being disposed at intervals along a length direction of the flexible circuit board 10; a plurality of second segments 112, the plurality of second segments 112 being disposed at intervals along the length direction of the flexible circuit board 10, and the second segments 112 being disposed at intervals with the first segments 111 in the width direction of the flexible circuit board 10; the plurality of third sections 113, the plurality of third sections 113 are arranged at intervals along the length direction of the flexible circuit board 10, and opposite ends of the third sections 113 are respectively connected with the adjacent first sections 111 and second sections 112; wherein the first section 111 and the two third sections 113 connected to opposite ends thereof enclose an open slot 13, and the second section 112 and the two third sections 113 connected to opposite ends thereof enclose an open slot 13.

The plurality of first segments 111, the plurality of second segments 112, and the plurality of third segments 113 may enclose the plurality of open slots 13, and two third segments 113 connected to opposite ends of the first segments 111 may find a position change with respect to the first segments 111, for example, two third segments 113 may be expanded outwardly with respect to the first segments 111, or two third segments 113 may be expanded inwardly with respect to the first segments 111, at which time the body 11 has a buffering function. Accordingly, two third segments 113 connected to opposite ends of the second segment 112 may find a change in position with respect to the second segment 112, for example, two third segments 113 may be expanded outwardly with respect to the second segment 112, or two third segments 113 may be expanded inwardly with respect to the second segment 112, at which time the body 11 has a buffering function.

In one embodiment, the number of the first sections 111 is equal to the number of the second sections 112, and the sum of the number of the first sections 111 and the number of the second sections 112 is two more than the number of the open grooves 13, so that the opposite ends of the flexible circuit board 10 may have the first sections 111 and the second sections 112, respectively, in the length direction of the flexible circuit board 10, as shown in fig. 1.

In one embodiment, the third sections 113 are disposed in parallel, so that the enclosed open slot 13 is a U-shaped slot, which not only has a relatively simple structure, but also can provide a relatively large avoiding space, and can facilitate the molding of the flexible circuit board 10.

As shown in connection with fig. 1, a plurality of first segments 111 are sequentially disposed along the length direction of the flexible circuit board 10, a plurality of second segments 112 are sequentially disposed 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 opposite ends of the third segment 113 may be connected to the first segments 111 and the second segments 112, respectively.

In one embodiment, the signal collecting portions 12 are connected to each first section 111, and the signal collecting portions 12 are connected to each second section 112, so that the collecting capability of the signal collecting portions 12 can be improved, and the signal collecting capability of the flexible circuit board 10 can be improved.

In one embodiment, the battery pack further includes a battery assembly, the plurality of unit cells 20 may form the battery assembly, the flexible circuit board 10 is disposed on the battery assembly, and the signal collecting portion 12 is connected with the battery assembly, so that the flexible circuit board 10 may be reliably disposed on the battery assembly, and the signal collecting portion 12 may be convenient to collect temperature information or voltage information of the battery assembly.

In one embodiment, as shown in fig. 4, the battery assembly includes a plurality of unit cells 20 and a conductive bar 30, and the conductive bar 30 electrically connects at least two unit cells 20, so that the unit cells 20 may be formed in series or in parallel.

At least part of the orthographic projection of the conductive bar 30 facing the plane of the first opening 131 is located in the first opening 131, that is, the open slot 13 can be used for avoiding the conductive bar 30, thereby facilitating the arrangement of the flexible circuit board 10 and improving the space utilization of the battery pack.

The unit cell 20 includes an electric core and an electrolyte, and is capable of performing a minimum unit of electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stack portion including a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. Wherein the polarities of the first electrode and the second electrode are interchangeable.

In some embodiments, the unit cell 20 may be a second prismatic cell, that is, the cell may be a prismatic cell, and the prismatic cell is further a quadrangular cell, where the quadrangular cell is mainly in a prismatic shape, but it is not strictly limited whether each side of the prism is necessarily a strictly defined straight line, and the corners between the sides are not necessarily right angles, and may be arc transitions.

The single batteries 20 can be laminated batteries, so that not only are the batteries convenient to group, but also the batteries with longer lengths can be obtained through processing. Specifically, the battery cell is a laminated battery cell, and the battery cell is provided with a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece, which are mutually laminated, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell.

Alternatively, the unit cell 20 may be a wound cell, that is, a first electrode sheet, a second electrode sheet opposite to the first electrode sheet, and a separator sheet disposed between the first electrode sheet and the second electrode sheet are wound to obtain a wound cell.

In some embodiments, the battery cells 20 may be cylindrical batteries. The single battery can be a winding type battery, namely, a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain a winding type battery cell.

In one embodiment, all of the orthographic projection of the conductive strip 30 toward the plane of the first opening 131 may be located within the first opening 131. Alternatively, the portion of the conductive strip 30 that is orthographic projected toward the plane of the first opening 131 is located in the first opening 131.

In one embodiment, as shown in fig. 4, the conductive strip 30 includes a plurality of sub-conductive strips 31, the plurality of sub-conductive strips 31 are spaced apart along the length direction of the flexible circuit board 10, and the sub-conductive strips 31 electrically connect the two unit cells 20; wherein, each open slot 13 corresponds to a sub-conductive bar 31, thereby conveniently realizing the arrangement of the sub-conductive bar 31, and avoiding the interference between the flexible circuit board 10 and the sub-conductive bar 31, thereby improving the safety performance of the battery pack.

In one embodiment, the number of sub-conductor bars 31 may be equal to the number of open slots 13, in which case all of the orthographic projections of the conductor bars 30 toward the plane of the first opening 131 may be located in the first opening 131, i.e., each open slot 13 corresponds to a sub-conductor bar 31, and all of the orthographic projections of each sub-conductor bar 31 toward the plane of the first opening 131 may be located in the first opening 131, i.e., each open slot 13 may be used to avoid one sub-conductor bar 31.

In one embodiment, the number of the sub-conductive bars 31 is greater than the number of the open grooves 13, whereby the material consumption of the flexible circuit board 10 can be reduced, and it can be ensured that the unit cells 20 can have a sufficient number, thereby ensuring the capacity of the battery pack.

The number of the sub-conductive bars 31 is greater than the number of the open slots 13, and at this time, the orthographic projection of the conductive bars 30 toward the plane of the first opening 131 may be located in the first opening 131, that is, each open slot 13 corresponds to a sub-conductive bar 31, and the outside of the open slot 13 may have at least one sub-conductive bar 31, where at this time, the orthographic projection of the sub-conductive bar 31 located outside the open slot 13 toward the plane of the first opening 131 is located outside the first opening 131.

The number of the sub-conductive bars 31 may be two more than the number of the open grooves 13, for example, the sum of the number of the first sections 111 and the number of the second sections 112 may be two more than the number of the open grooves 13, and the number of the first sections 111 and the second sections 112 may correspond to one sub-conductive bar 31, respectively.

In one embodiment, the signal acquisition portion 12 is coupled to the conductor bar 30 so as to be operable to acquire temperature information or voltage information on the conductor bar 30.

The signal acquisition unit 12 may be connected to the battery cell 20, for example, the signal acquisition unit 12 may be in contact with a post assembly of the battery cell 20.

In one embodiment, the body 11 is thermally fused to the battery pack, so that not only the connection of the body 11 can be facilitated, but also the connection stability of the body 11 can be improved.

The main body 11 may have a plurality of hot melt connection locations with the battery pack, for example, each of the first sections 111 and each of the second sections 112 may be connected to the battery pack by hot melt, and at this time, the hot melt connection point between the main body 11 and the battery pack may be equal to the sum of the number of the first sections 111 and the number of the second sections 112; alternatively, the hot melt connection point between the 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; alternatively, the hot melt connection point between the body 11 and the battery pack may be greater than the sum of the number of the first sections 111 and the number of the second sections 112.

The body 11 may be thermally fused to the unit cell 20, the body 11 may be directly thermally fused to the unit cell 20, or the body 11 may be thermally fused to the unit cell 20 through other structures.

In one embodiment, as shown in fig. 3 and 4, the battery pack is formed with the accommodating groove 41, that is, the battery assembly is formed with the accommodating groove 41, and at least part of the flexible circuit board 10 is located in the accommodating groove 41, so that not only can the flexible circuit board 10 be reliably fixed, but also the flexible circuit board 10 can be conveniently arranged, and the installation space can be provided for the flexible circuit board 10, thereby improving the space utilization rate of the battery pack.

In one embodiment, as shown in fig. 4, the battery pack further includes a bracket 40, the unit cells 20 are disposed on the bracket 40, the bracket 40 is formed with a receiving groove 41, the main body 11 is connected to the bracket 40 by hot melting, the bracket 40 not only can fix the unit cells 20, but also can facilitate grouping of the unit cells 20, and can facilitate the flexible circuit board 10 to be disposed on the bracket 40, thereby avoiding the damage problem of the flexible circuit board 10.

It should be noted that, a plurality of single batteries 20 may be disposed on one bracket 40, or a plurality of brackets 40 may be disposed, and each bracket 40 may correspond to one single battery 20.

In one embodiment, the side of the main body 11 far away from the battery assembly is not protruded from the conductive bar 30, and the side of the main body 11 far away from the single battery 20 is not protruded from the conductive bar 30, so that the space of the battery pack can be prevented from being increased by the main body 11, and damage to the main body 11 caused by other external structures can be prevented, thereby improving the safety use performance of the flexible circuit board 10.

It should be noted that the battery pack may be a battery module or a battery pack.

The battery module includes a plurality of unit cells 20, and the battery module may further include an end plate and a side plate for fixing the plurality of unit cells 20.

It should be noted that, the plurality of unit batteries 20 may be disposed in the battery case after forming the battery module, and the plurality of unit batteries 20 may be fixed by the end plate and the side plate. The plurality of unit cells 20 may be directly disposed in the battery case, that is, the plurality of unit cells 20 do not need to be grouped, and at this time, the end plates and the side plates may be removed. When the unit cells 20 are cylindrical cells, the unit cells 20 may form a battery module using a pallet.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (15)

1. The battery pack is characterized by comprising a flexible circuit board (10) and at least two single batteries (20) connected with the flexible circuit board (10), wherein the flexible circuit board (10) comprises a main body (11) and a signal acquisition part (12), the signal acquisition part (12) is connected to the main body (11), the signal acquisition part (12) is connected with the single batteries (20), the main body (11) comprises a bending piece, a plurality of open slots (13) are formed in the bending piece in a surrounding mode along the length direction of the flexible circuit board (10), and the open slots (13) penetrate through the flexible circuit board (10) and intersect with the circumferential edge of the flexible circuit board (10) so that the open slots (13) comprise two first openings (131) which are opposite and second openings (132) connected with the two first openings (131);

wherein two adjacent second openings (132) face opposite sides of the flexible circuit board (10) respectively.

2. The battery pack according to claim 1, wherein the open slot (13) corresponds to the signal acquisition portion (12) such that at least part of an orthographic projection of the signal acquisition portion (12) toward a plane in which the first opening (131) is located within the first opening (131).

3. The battery pack according to claim 2, wherein a portion of the orthographic projection of the signal acquisition portion (12) toward the plane in which the first opening (131) is located within the first opening (131).

4. A battery pack according to claim 2 or 3, wherein the signal collection portion (12) is plural, and each of the open grooves (13) corresponds to the signal collection portion (12).

5. The battery pack according to claim 4, wherein the number of the signal collection portions (12) is greater than the number of the open grooves (13);

wherein the number of the signal acquisition parts (12) is two more than the number of the open grooves (13).

6. The battery pack according to claim 1, wherein the open groove (13) is a U-shaped groove.

7. The battery pack according to claim 1, wherein the main body (11) includes:

a plurality of first segments (111), wherein the first segments (111) are arranged at intervals along the length direction of the flexible circuit board;

a plurality of second sections (112), wherein the second sections (112) are arranged at intervals along the length direction of the flexible circuit board, and the second sections (112) and the first sections (111) are arranged at intervals along the width direction of the flexible circuit board;

a plurality of third sections (113), wherein the third sections (113) are arranged at intervals along the length direction of the flexible circuit board, and two opposite ends of the third sections (113) are respectively connected with the adjacent first sections (111) and second sections (112);

the first section (111) and the two third sections (113) connected with the opposite ends of the first section enclose the open slot (13), and the second section (112) and the two third sections (113) connected with the opposite ends of the second section enclose the open slot (13).

8. The battery pack according to claim 7, wherein the number of the first segments (111) is equal to the number of the second segments (112), and a sum of the number of the first segments (111) and the number of the second segments (112) is two more than the number of the open grooves (13).

9. The battery pack according to claim 7, wherein a plurality of the third segments (113) are arranged in parallel, and/or the signal acquisition unit (12) is connected to each of the first segments (111), and the signal acquisition unit (12) is connected to each of the second segments (112).

10. The battery pack according to claim 1, further comprising a conductive row (30), the conductive row (30) electrically connecting at least two of the unit cells (20);

wherein at least part of the orthographic projection of the conductive bar (30) towards the plane of the first opening (131) is located in the first opening (131).

11. The battery according to claim 10, characterized in that the portion of the conductive strip (30) that is orthographic projected towards the plane of the first opening (131) is located within the first opening (131).

12. The battery pack according to claim 10, wherein the signal acquisition portion (12) is connected to the conductive strip (30).

13. The battery pack according to claim 10, wherein the battery pack is formed with a receiving groove (41), and at least part of the flexible circuit board is located in the receiving groove (41).

14. The battery pack according to claim 13, further comprising a bracket (40), the unit cells (20) being provided to the bracket (40), the bracket (40) being formed with receiving grooves (41), the main body (11) being thermally fused to the bracket (40).

15. The battery according to any one of claims 10 to 14, wherein a side of the main body (11) remote from the unit cells (20) is not provided protruding from the conductive row (30).