Acquisition assembly of battery pack and battery pack

Abstract

The utility model provides a battery pack acquisition assembly and a battery pack, the battery pack comprises a plurality of battery packs, the plurality of battery packs are arranged at intervals along a first direction, and each battery pack comprises a plurality of batteries arranged along a second direction; the flexible circuit boards are arranged between the corresponding battery packs, each flexible circuit board is connected with a plurality of signal acquisition pieces, and each signal acquisition piece is used for acquiring the voltage of the battery; and the acquisition boards are arranged between the adjacent flexible circuit boards, and each acquisition board is connected with at least two flexible circuit boards. And the number of the acquisition plates is reduced, so that the capacity space of the battery pack occupied by the acquisition plates can be reduced, and the lightweight design of the battery pack is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a collection component of a battery pack and a battery pack. Background Art

[0002] A battery pack is usually composed of multiple batteries connected in series and parallel to achieve the high voltage and large capacity required by the battery pack. The battery pack usually uses a connecting bar to connect multiple batteries in series and parallel, and a collection component is further arranged inside the battery pack. The collection component is used to collect the voltage and temperature of the battery. In the related technology, the collection component includes a collection board and a flexible circuit board. A nickel sheet is arranged on the flexible circuit board, which is connected to the electrode of the battery module through the nickel sheet. The nickel sheet transmits the collected battery voltage to the connector on the collection board through the FPC, and further transmits it to the BMS (Battery Management System) through the connector. Usually, a flexible circuit board is usually connected to a collection board, and the collection board usually needs to occupy a larger capacity space inside the battery pack, thus affecting the lightweight design of the battery pack. Utility Model Content

[0003] The embodiments of the utility model provide a collection component of a battery pack and a battery pack, which can improve the technical problem that the collection component inside the battery pack occupies a large space.

[0004] In a first aspect, an embodiment of the present utility model provides a battery pack, comprising:

[0005] A plurality of battery packs, wherein the plurality of battery packs are arranged at intervals along a first direction, and each of the battery packs includes a plurality of batteries arranged along a second direction intersecting the first direction;

[0006] A plurality of flexible circuit boards, each of which is disposed on a corresponding battery pack, and each of which is connected to a plurality of signal acquisition components, and the signal acquisition components are used to acquire the voltage and / or temperature of the corresponding battery;

[0007] A plurality of acquisition boards, each of which is disposed between adjacent flexible circuit boards, and each of which is electrically connected to at least two flexible circuit boards.

[0008] In one embodiment, the battery pack includes a plurality of flexible circuit board groups spaced apart along the first direction, each of the flexible circuit board groups includes a plurality of flexible circuit boards spaced apart along the second direction, the flexible circuit board groups include a first flexible circuit board group and a second flexible circuit board group adjacently arranged, and at least one flexible circuit board in the first flexible circuit board group and at least one flexible circuit board in the second flexible circuit board group are connected to the same acquisition board.

[0009] In one embodiment, the first flexible circuit board group is arranged closer to the acquisition board than the second flexible circuit board group, at least one flexible circuit board in the first flexible circuit board group is connected to the acquisition board along its extension direction, and at least one flexible circuit board in the second flexible circuit board group is connected to the same acquisition board after being bent.

[0010] In one embodiment, the plurality of acquisition boards include a first acquisition board and a second acquisition board that are spaced apart; the plurality of flexible circuit boards of the first flexible circuit board group include a first flexible circuit board, a second flexible circuit board, and a third flexible circuit board that are sequentially arranged, wherein the first flexible circuit board is connected to the first acquisition board, the third flexible circuit board is connected to the second acquisition board, the second flexible circuit board is connected to the first acquisition board, or the second flexible circuit board is connected to the second acquisition board.

[0011] In one embodiment, the multiple flexible circuit boards of the second flexible circuit board group include a fourth flexible circuit board, a fifth flexible circuit board, and a sixth flexible circuit board arranged in sequence, wherein the fourth flexible circuit board is bent and connected to the first acquisition board, the sixth flexible circuit board is bent and connected to the second acquisition board, the fifth flexible circuit board is bent and connected to the second acquisition board, or the fifth flexible circuit board is bent and connected to the first acquisition board.

[0012] In one embodiment, the flexible circuit board includes a main body and a bending portion connected to one end of the main body, the bending portion includes a first bending section, a connecting section and a second bending section connected in sequence, wherein the first bending section is connected to the main body, the connecting section connects the first bending section and the second bending section, the second bending section is connected to the acquisition board, and an extension direction of the main body is different from an extension direction of the connecting section.

[0013] In one embodiment, it further includes buffer cotton, wherein the buffer cotton is arranged between the first bending section and the main body, and / or the buffer cotton is arranged between the second bending section and the connecting section.

[0014] In one embodiment, the flexible circuit board includes a plurality of buffer grooves arranged at intervals, and the buffer grooves are arranged on both sides of the flexible circuit board.

[0015] In one embodiment, one end of the flexible circuit board is welded to the acquisition board, and a fixing buckle is provided at the welding end of each flexible circuit board. The fixing buckle is provided with a plurality of holes or grooves, and the holes or grooves are used to accommodate colloid, and the colloid covers the welding end.

[0016] In a second aspect, an embodiment of the present utility model provides a collection component of a battery pack, wherein the battery pack includes a plurality of battery packs, and the collection component includes:

[0017] A plurality of flexible circuit boards, wherein the flexible circuit boards are arranged between the corresponding battery packs, and each of the flexible circuit boards is connected to a plurality of signal acquisition components, and each of the signal acquisition components is used to acquire the voltage and / or temperature of the corresponding battery;

[0018] A plurality of acquisition boards are arranged between adjacent flexible circuit boards, and each of the acquisition boards is connected to at least two of the flexible circuit boards.

[0019] Beneficial effects of the embodiments of the utility model:

[0020] In an embodiment of the utility model, by connecting at least two flexible circuit boards to the same acquisition board, the number of acquisition boards provided in the battery pack can be reduced. Since the number of acquisition boards is reduced, the capacity space of the battery pack occupied by the acquisition boards can be reduced, which is beneficial to the lightweight design of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a three-dimensional structural schematic diagram of a CCS assembly provided in an embodiment of the utility model;

[0023] Figure 2 yes Figure 1 An enlarged view of the local A;

[0024] Figure 3 yes Figure 1 An enlarged view of the local B;

[0025] Figure 4 It is a three-dimensional structural schematic diagram of a collection component provided by an embodiment of the utility model;

[0026] Figure 5 It is a three-dimensional structural schematic diagram of a collection component provided by another embodiment of the utility model;

[0027] Figure 6 yes Figure 4 An enlarged view of a local area D;

[0028] Figure 7 yes Figure 4 An enlarged view of the local E;

[0029] Figure 8 It is a three-dimensional diagram of a fixing buckle provided by an embodiment of the utility model;

[0030] Fig. 9 yes Figure 4 An enlarged view of the local C;

[0031] Figure Number:

[0032] 100.CCS components;

[0033] 110, connecting row;

[0034] 120. Collection component;

[0035] 10. Acquisition board; 11. First acquisition board; 12. Second acquisition board;

[0036] 20. flexible circuit board; 200. flexible circuit board group; 210. first flexible circuit board group; 220. second flexible circuit board group; 211. first flexible circuit board; 212. second flexible circuit board; 213. third flexible circuit board; 221. fourth flexible circuit board; 222. fifth flexible circuit board; 223. sixth flexible circuit board; 23. main body; 24. bending portion; 241. first bending section; 242. second bending section; 243. connecting section; 25. avoidance hole; 26. buffer groove; 27. buffer cotton;

[0037] 30. Fixing buckle; 31. Buckle structure; 32. Glue hole;

[0038] 40. bracket; 41. signal acquisition component; DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0040] An embodiment of the utility model provides a battery pack, which includes a box and a plurality of batteries arranged inside the box. The plurality of batteries are arranged in series, parallel or mixed connection to meet the usage requirements of the battery pack. The battery pack can be used in electric vehicles or electric tools.

[0041] In the box of the battery pack, multiple batteries are arranged in a matrix. Taking square batteries as an example, multiple batteries are arranged side by side along a first direction X to form a battery pack, and multiple battery packs are arranged side by side along a second direction Y to form a single-layer battery module. The battery module can be a single-layer battery module or a double-layer battery module. The first direction X and the second direction Y can refer to Figure 1 shown.

[0042] The battery module also includes a connecting bar 110, through which the adjacent first battery and the second battery are connected in series, one side of the connecting bar 110 is connected to the positive pole of the first battery or the second battery, and the other side of the connecting bar 110 is connected to the negative pole of the second battery or the first battery, and further, the connecting bar 110 is fixed to the pole of the battery by laser welding. The connecting bar 110 can be an aluminum bar, or a copper-aluminum composite bar.

[0043] The battery pack includes a BMS (Battery Management System) and a CCS component 100 (Cells Contact System-integrated busbar). The BMS is used to control the working status of multiple battery modules. The CCS component 100 is used to integrate the connecting bar 110, control circuit and other components inside the battery pack into one module. The CCS component 100 includes a collection component 120, a bracket 40, a connecting bar 110 and a connector. The connecting bar 110 connects multiple batteries in series and parallel by laser welding. The signal collection component 120 is electrically connected to the connecting bar 110 to collect signals such as the battery voltage and temperature, and provides the voltage, temperature and other signals to the connector, and then provides them to the BMS system through the connector.

[0044] In the related art, the acquisition component 120 includes an acquisition board 10 and a flexible circuit board 20. A nickel sheet is provided on the flexible circuit board 20, which is connected to the connection row 110 through the nickel sheet. The nickel sheet transmits the collected battery voltage to the connector on the acquisition board 10 through the FPC, and further transmits it to the BMS system through the connector. Usually, one flexible circuit board 20 is usually connected to at least one acquisition board 10, and the acquisition board 10 is usually set as a PCB board. The acquisition board 10 needs to occupy a larger capacity space inside the battery pack, thus affecting the demand for lightweight design of the battery pack.

[0045] In one embodiment of the present application, the structure of the collection component 120 is improved, thereby facilitating the lightweight design of the battery pack. Figure 1 The figure shows a three-dimensional image of the CCS components inside the battery pack. Figure 2 for Figure 1 The enlarged view of the local A, Figure 3 for Figure 1 The CCS component 100 includes a collection component 120 including a collection board 10 and a flexible circuit board 20, wherein the flexible circuit board 20 is arranged between the corresponding battery packs, and each of the flexible circuit boards 20 is connected to a plurality of signal collection components 41, and the signal collection components 41 are used to collect the voltage and / or temperature of the corresponding battery, and the collection board 10 is arranged between adjacent flexible circuit boards 20, and each of the collection boards 10 is connected to at least two flexible circuit boards 20.

[0046] By connecting at least two flexible circuit boards 20 to the same acquisition board 10, the number of acquisition boards 10 provided in the battery pack can be reduced. Since the number of acquisition boards 10 is reduced, the capacity space of the battery pack occupied by the acquisition boards 10 can be reduced, which is beneficial to the lightweight design of the battery pack.

[0047] Further references Figure 1 As shown, the battery pack includes a plurality of flexible circuit board groups 200 spaced apart along the first direction X, each of the flexible circuit board groups 200 includes a plurality of flexible circuit boards 20 spaced apart along the second direction, the flexible circuit board groups 200 include a first flexible circuit board group 210 and a second flexible circuit board group 220 adjacently arranged, at least one flexible circuit board in the first flexible circuit board group 210 and at least one flexible circuit board in the second flexible circuit board group 220 are connected to the same acquisition board 10.

[0048] By connecting at least one flexible circuit board in the first flexible circuit board group 210 and at least one flexible circuit board in the second flexible circuit board group 220 that are adjacently arranged to the same acquisition board 10, the arrangement structure of the acquisition component 120 can be simplified, and it is avoided that some of the multiple flexible circuit boards 20 are connected to the same acquisition board 10 after complex wiring design.

[0049] Further references Figure 2 and Figure 3 As shown, the first flexible circuit board group 210 is arranged closer to the acquisition board 10 than the second flexible circuit board group 220, at least one flexible circuit board in the first flexible circuit board group 210 is connected to the acquisition board 10 along a first direction, and at least one flexible circuit board in the second flexible circuit board group 220 is connected to the acquisition board 10 after being bent.

[0050] At least one flexible circuit board in the first flexible circuit board group 210 closer to the acquisition board 10 is directly connected to the acquisition board 10 along the first direction, and at least one flexible circuit board in the second flexible circuit board group 220 farther from the acquisition board 10 is bent and connected to the acquisition board 10, thereby simplifying the installation process of the flexible circuit board group 200 and improving the assembly efficiency of the acquisition component 120.

[0051] The following section further illustrates the structure of the acquisition component 120 by taking an acquisition board 10 connected to three flexible circuit boards as an example. It is understandable that, according to the arrangement structure of the batteries inside the battery pack, the number of flexible circuit boards 20 that can be connected to an acquisition board 10 can also be four, five, six or even more.

[0052] Further references Figure 1 , Figure 2 as well as Figure 4 As shown, the acquisition board 10 includes a first acquisition board 11 and a second acquisition board 12 arranged at intervals; the first flexible circuit board group 210 includes a first flexible circuit board 211, a second flexible circuit board 212, and a third flexible circuit board 213 arranged in sequence, wherein the first flexible circuit board 211 and the second flexible circuit board 212 are connected to the first acquisition board 11, and the third flexible circuit board 213 is connected to the second acquisition board 12, or the first flexible circuit board 211 is connected to the first acquisition board 11, and the second flexible circuit board 212 and the third flexible circuit board 213 are connected to the second acquisition board 12.

[0053] When the first flexible circuit board group 210 is close to the acquisition board 10, two flexible circuit boards 20 in the first flexible circuit board group 210 can be connected to the same acquisition board 10 along the first direction, for example Figure 4 As shown, the first acquisition board 11 is arranged between the first flexible circuit board 211 and the second flexible circuit board 212, and the second acquisition board 12 is arranged between the second flexible circuit board 212 and the third flexible circuit board 213, wherein the first flexible circuit board 211 is connected to one side of the first acquisition board 11, and the second flexible circuit board 212 can be connected to the other side of the first acquisition board 11, or the second flexible circuit board 212 can be connected to one side of the second acquisition board 12, and the third flexible circuit board 213 is connected to the second acquisition board 12.

[0054] Further references Figure 1 , Figure 3 as well as Figure 5As shown, the second flexible circuit board group 220 includes a fourth flexible circuit board 221, a fifth flexible circuit board 222, and a sixth flexible circuit board 223 arranged in sequence, wherein the fourth flexible circuit board 221 is bent and connected to the first acquisition board 11, and the fifth flexible circuit board 222 and the sixth flexible circuit board 223 are bent and connected to the second acquisition board 12, or the fourth flexible circuit board 221 and the fifth flexible circuit board 222 are bent and connected to the first acquisition board 11, and the sixth flexible circuit board 223 is bent and connected to the second acquisition board 12.

[0055] When the distance between the second flexible circuit board group 220 and the acquisition board 10 is relatively far, two of the flexible circuit boards in the second flexible circuit board group 220 can be bent and connected to the same acquisition board 10, for example Figure 5 As shown, the first acquisition board 11 is arranged between the fourth flexible circuit board 221 and the fifth flexible circuit board 222, and the second acquisition board 12 is arranged between the fifth flexible circuit board 222 and the sixth flexible circuit board 223, wherein the fourth flexible circuit board 221 is bent and connected to one side of the first acquisition board 11, and the fifth flexible circuit board 222 can be connected to the other side of the first acquisition board 11, or the fifth flexible circuit board 222 can be connected to one side of the second acquisition board 12, and the sixth flexible circuit board 223 is connected to the other side of the second acquisition board 12.

[0056] Considering that the same number of flexible circuit boards 20 are connected to the first acquisition board 11 and the second acquisition board 12, the first flexible circuit board 211 is connected to the left side of the first acquisition board 11, and the second flexible circuit board 212 is connected to the right side of the first acquisition board 11, wherein the first flexible circuit board 211 and the second flexible circuit board 212 are relatively arranged at the connection position of the first acquisition board 11, and a fourth flexible circuit board 221 is also connected to the left side of the first acquisition board 11, wherein the fourth flexible circuit board 221 and the first flexible circuit board 211 remain relatively flush, and the fourth flexible circuit board 221 is configured to be connected to the first acquisition board 11 after being bent. A third flexible circuit board 213 is connected to the right side of the second acquisition board 12, a fifth flexible circuit board 222 is also connected to the left side of the second acquisition board 12, and a sixth flexible circuit board 223 is also connected to the right side of the second acquisition board 12, wherein the fifth flexible circuit board 222 is relatively flush with the second flexible circuit board 212, and the sixth flexible circuit board 223 is relatively flush with the third flexible circuit board 213, and the fifth flexible circuit board 222 and the sixth flexible circuit board 223 are configured to be connected to the second flexible circuit board 212 after being bent.

[0057] Further references Figure 4 , Figure 5 as well as Figure 6As shown, the flexible circuit board 20 includes a main body 23 and a bending portion 24 connected to one end of the main body 23, the bending portion 24 includes a first bending section 241, a connecting section 243 and a second bending section 242 connected in sequence, wherein the first bending section 241 is connected to the main body 23, the connecting section 243 is used to connect the first bending section 241 and the second bending section 243, the second bending section 242 is connected to the acquisition board 10, and the extension direction of the connecting section 243 is different from the extension direction of the main body 23.

[0058] When the flexible circuit board 20 is far away from the collection board 10, the flexible circuit board 20 is connected to the collection board 10 by bending it twice. Since the flexible circuit board 20 is made of polyimide or polyester film as a substrate and is a light, thin, freely bendable and foldable flexible printed circuit board, the flexible circuit board 20 is configured to be easy to fold. The end of the flexible circuit board 20 can be connected to the collection board 10 after folding.

[0059] like Figure 2 and Figure 3 As shown, the first bending section 241 of the flexible circuit board 20 is configured to be formed by bending the main body 23 by 90°, the extension direction of the connecting section 243 is approximately perpendicular to the extension direction of the main body 23, and the second bending section 242 is configured to be formed by bending the connecting section 243 by 90°, and the connecting section 243 covers part of the connecting row 110.

[0060] Further references Figures 1 to 5 As shown, the signal acquisition component 41 includes a voltage acquisition component, which is preferably made of nickel sheets. A plurality of voltage acquisition components are arranged at intervals on both sides of each flexible circuit board 20, each voltage acquisition component is welded to a connecting bar, and a connector is further arranged on each acquisition board 10. The connecting bar is welded to the positive pole or negative pole of each battery. The voltage acquisition component 41 collects the voltage of the battery through the collecting connecting bar, and the voltage information collected by the voltage acquisition component 41 is further transmitted to the connector fixed on the acquisition board 10 through the flexible circuit board 20, and is transmitted to the BMS through the connector connected to the BMS.

[0061] The signal acquisition component 41 also includes a temperature sensor, which is preferably an NTC thermistor temperature sensor. One end of the NTC can be welded to a nickel sheet or FPC, and the other end of the NTC is welded to a battery. The temperature sensor further transmits the collected temperature information to a connector fixed on the acquisition board 10 through the flexible circuit board 20, and transmits it to the BMS through a connector connected to the BMS.

[0062] Further references Figure 6As shown, a buffer cotton 27 is provided between the first bending section 241 and the main body 23, and / or a buffer cotton 27 is provided between the second bending section 242 and the first bending section 241. The buffer cotton 27 provided between the first bending section 241 and the main body 23 can prevent the first bending section 241 and the main body 23 from being squeezed or pulled against each other, thereby causing deformation of the flexible circuit board 20, and the buffer cotton 27 provided between the second bending section 242 and the first bending section 241 can prevent the second bending section 242 and the first bending section 241 from being squeezed or pulled against each other, thereby causing deformation of the flexible circuit board 20.

[0063] The above-mentioned flexible circuit board 20 and acquisition board 10 are both fixed on the bracket 40. A plurality of heat rivet studs can be arranged on the bracket 40. A plurality of through holes can be arranged on the flexible circuit board 20 and the acquisition board 10. The heat rivet studs can pass through the through holes to fix the flexible circuit board 20 and the acquisition board 10 on the bracket 40.

[0064] Further references Figure 7 and Figure 8 As shown, one end of the flexible circuit board 20 is welded on the acquisition board 10, and a reinforcing fixing buckle 30 is further provided on the upper surface of the fixed end of the flexible circuit board 20. A fixing buckle 30 is provided at each welding end of the flexible circuit board 20, and the fixing buckle 30 is provided with a plurality of holes 32 or grooves, and the inside of the holes 32 or grooves is used to accommodate colloid, and the colloid covers the welding end. The colloid is added to the holes 32 or grooves of the fixing buckle 30, and dried by UV (ultraviolet rays). By using the fixing buckle 30, the end of the flexible circuit board 20 can be stably connected to the acquisition board 10, thereby preventing the connection between the flexible circuit board 20 and the acquisition board 10 from being loose. The fixing buckle 30 also includes a snap-on structure 31 provided at both ends thereof, and a through hole is further provided on the acquisition board 10. The snap-on can pass through the through hole and abut against the acquisition board 10. The inside of the snap-on structure is provided with a hole 32 for accommodating the colloid, and a groove for accommodating the colloid is provided around the snap-on structure 31.

[0065] Further references Figure 4 and Fig. 9 As shown, the flexible circuit board 20 includes a plurality of buffer grooves 26 arranged at intervals. The buffer grooves 26 are arranged on both sides of the flexible circuit board 20. The shape of the buffer grooves 26 can be set to a circular shape or an S shape. The battery will expand during use, and the expansion of the battery will cause the flexible circuit board 20 to deform. By setting the buffer groove 26 structure, the flexible circuit board 20 can be prevented from being deformed and torn.

[0066] A plurality of avoidance holes 25 are also provided on the flexible circuit board 20 and on a bracket 40 for supporting the flexible circuit board 20. The avoidance holes 25 are provided opposite to the pressure relief valve of the battery so as to avoid blocking the battery valve opening. It is understandable that if the avoidance holes 25 are not provided on the flexible circuit board 20, the battery will open the pressure relief valve during thermal runaway of the battery, and the high-temperature electrolyte will spray out from the pressure relief valve, thereby causing the FPC to be corroded by the high-temperature electrolyte and fail.

[0067] In the above embodiment, the battery pack is configured as a CTB structure, that is, the batteries are directly arranged inside the box without providing a battery module structure, which is beneficial to the lightweight setting of the battery pack. In other optional embodiments, a battery module structure may also be provided inside the battery pack, that is, multiple battery modules are provided inside the box of the battery pack, and each battery module further includes multiple batteries arranged in a matrix.

[0068] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery pack, characterized in that: include: A plurality of battery packs, wherein the plurality of battery packs are arranged at intervals along a first direction, and each of the battery packs includes a plurality of batteries arranged along a second direction intersecting the first direction; A plurality of flexible circuit boards, each of which is disposed on a corresponding battery pack, and each of which is connected to a plurality of signal acquisition components, and the signal acquisition components are used to acquire the voltage and / or temperature of the corresponding battery; A plurality of acquisition boards, each of which is disposed between adjacent flexible circuit boards, and each of which is electrically connected to at least two flexible circuit boards.

2. The battery pack according to claim 1, characterized in that: The battery pack includes a plurality of flexible circuit board groups spaced apart along the first direction, each of the flexible circuit board groups includes a plurality of flexible circuit boards spaced apart along the second direction, the flexible circuit board groups include a first flexible circuit board group and a second flexible circuit board group adjacently arranged, and at least one flexible circuit board in the first flexible circuit board group and at least one flexible circuit board in the second flexible circuit board group are connected to the same acquisition board.

3. The battery pack according to claim 2, characterized in that: The first flexible circuit board group is arranged closer to the acquisition board than the second flexible circuit board group, at least one flexible circuit board in the first flexible circuit board group is connected to the acquisition board along its extension direction, and at least one flexible circuit board in the second flexible circuit board group is connected to the same acquisition board after being bent.

4. The battery pack according to claim 3, characterized in that: The plurality of acquisition boards include a first acquisition board and a second acquisition board that are spaced apart; The multiple flexible circuit boards of the first flexible circuit board group include a first flexible circuit board, a second flexible circuit board, and a third flexible circuit board arranged in sequence, wherein the first flexible circuit board is connected to the first acquisition board, the third flexible circuit board is connected to the second acquisition board, the second flexible circuit board is connected to the first acquisition board, or the second flexible circuit board is connected to the second acquisition board.

5. The battery pack according to claim 4, characterized in that: The multiple flexible circuit boards of the second flexible circuit board group include a fourth flexible circuit board, a fifth flexible circuit board, and a sixth flexible circuit board which are arranged in sequence, wherein the fourth flexible circuit board is bent and connected to the first acquisition board, the sixth flexible circuit board is bent and connected to the second acquisition board, the fifth flexible circuit board is bent and connected to the second acquisition board, or the fifth flexible circuit board is bent and connected to the first acquisition board.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The flexible circuit board includes a main body and a bending portion connected to one end of the main body, the bending portion includes a first bending section, a connecting section and a second bending section connected in sequence, wherein the first bending section is connected to the main body, the connecting section connects the first bending section and the second bending section, the second bending section is connected to the acquisition board, and the extension direction of the main body is different from the extension direction of the connecting section.

7. The battery pack according to claim 6, characterized in that: It also includes buffer cotton, which is arranged between the first bending section and the main body, and / or the buffer cotton is arranged between the second bending section and the connecting section.

8. The battery pack according to any one of claims 1 to 5, characterized in that: The flexible circuit board includes a plurality of buffer grooves arranged at intervals, and the buffer grooves are arranged on both sides of the flexible circuit board.

9. The battery pack according to any one of claims 1 to 5, characterized in that: One end of the flexible circuit board is welded to the acquisition board, and a fixing buckle is provided at the welding end of each flexible circuit board. The fixing buckle is provided with a plurality of holes or grooves, and the holes or grooves are used to accommodate colloid, and the colloid covers the welding end.

10. A collection component of a battery pack, the battery pack comprising a plurality of battery groups, characterized in that: The acquisition component comprises: A plurality of flexible circuit boards, wherein the flexible circuit boards are arranged between the corresponding battery packs, and each of the flexible circuit boards is connected to a plurality of signal acquisition components, and each of the signal acquisition components is used to acquire the voltage and / or temperature of the corresponding battery; A plurality of acquisition boards are arranged between adjacent flexible circuit boards, and each of the acquisition boards is connected to at least two of the flexible circuit boards.

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