Busbar assembly and battery pack

Abstract

The utility model provides a busbar assembly and a battery pack, the busbar assembly comprises a busbar support, a busbar assembly and a flexible circuit board, the busbar assembly and the flexible circuit board are arranged on the busbar support, and the flexible circuit board is located above the busbar assembly along the height direction of the busbar support; the busbar assembly comprises a first busbar and a second busbar which are arranged on the busbar bracket, and the first busbar and the second busbar are both used for electrically connecting two adjacent battery cells; a first avoiding groove with an opening in the bottom is formed in the second busbar, the first avoiding groove is used for avoiding a cross beam of a battery pack, and a notch corresponding to the first avoiding groove is formed in the busbar support. The busbar assembly disclosed by the utility model can solve the problems of serious waste of flexible circuit boards and high cost of the busbar assembly, so that cost reduction is realized while the modality of a battery pack is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a busbar assembly. At the same time, the utility model also relates to a battery pack provided with the busbar assembly. Background Art

[0002] At present, when most battery packs are designed, in order to meet the modal requirements of the battery pack, a crossbeam structure is provided on the lower housing. In order to avoid the crossbeam, the flexible circuit board of the busbar support assembly is usually designed in a "J" shape. The flexible circuit board accounts for a relatively high proportion of the price in the entire busbar support assembly. The "J" shape design will seriously waste the circuit board material, resulting in an increase in the total cost. Therefore, it is not conducive to reducing the waste of flexible circuit board material and reducing the cost of the busbar assembly while ensuring the modality of the battery pack. Summary of the Utility Model

[0003] In view of this, the utility model aims to provide a busbar assembly to reduce costs while ensuring the modality of the battery pack.

[0004] To achieve the above object, the technical solution of the utility model is realized as follows:

[0005] A busbar assembly includes a busbar support, a busbar assembly and a flexible circuit board provided on the busbar support. Along the height direction of the busbar support, the flexible circuit board is located above the busbar assembly;

[0006] The busbar assembly includes a first busbar and a second busbar provided on the busbar support. Both the first busbar and the second busbar are used for electrical connection between adjacent two battery cells;

[0007] The second busbar is provided with a first avoidance groove with an open bottom. The first avoidance groove is used to avoid the crossbeam of the battery pack, and a notch corresponding to the first avoidance groove is provided on the busbar support.

[0008] Further, along the height direction of the busbar support, the bottom of the first busbar and the bottom surface of the second busbar are located above the bottom surface of the busbar support; and / or,

[0009] The flexible circuit board is in a long strip shape.

[0010] Further, along the length direction of the busbar support, a downward extending extension part is provided in the middle of the flexible circuit board. A temperature detection unit for detecting the temperature of the battery cell is provided on the extension part;

[0011] A second avoidance groove for avoiding the extension part is provided on the busbar assembly.

[0012] Further, a temperature-sensitive bracket is provided between the busbar bracket and the busbar assembly. An installation groove corresponding to the extension portion is provided on one side of the temperature-sensitive bracket facing the busbar bracket.

[0013] Openings corresponding to the installation groove are provided on the busbar bracket, and the temperature detection unit is located in the installation space formed by the openings and the installation groove.

[0014] Further, a limiting frame located in the installation space is provided between the temperature-sensitive bracket and the flexible circuit board. The temperature detection unit is located within the limiting frame, and a foam is provided between the limiting frame and the bottom of the installation groove.

[0015] Further, the limiting frame is filled with thermal conductive adhesive; and / or, a heat conducting sheet is provided on one side of the extension portion away from the temperature detection unit.

[0016] Further, a first limiting structure is provided on the temperature-sensitive bracket, and a second limiting structure is provided on the busbar bracket. In the height direction of the busbar bracket, the first limiting structure and the second limiting structure jointly limit the second busbar; and / or,

[0017] A first observation hole is provided on the temperature-sensitive bracket, and the first observation hole is used to observe the setting positions of the foam and the temperature detection unit.

[0018] Further, second observation holes for observing the pole columns of the battery cells are provided on both the first busbar and / or the second busbar.

[0019] Further, the second observation hole is a long strip hole; and / or, along the length direction of the busbar bracket, plug connectors for connecting with the battery management system of the battery pack are respectively provided at both ends of the flexible circuit board.

[0020] Compared with the prior art, the present utility model has the following advantages:

[0021] For the busbar assembly of the present utility model, by arranging the flexible circuit board above the busbar assembly, the structure of the flexible circuit board can be simplified, and the existing corresponding functions can be realized without designing it into a complex shape, which is beneficial to reducing the waste of flexible circuit board materials, increasing the utilization rate of the flexible circuit board, reducing costs. At the same time, an avoidance groove is provided on the second busbar, and a notch corresponding to the avoidance groove is provided on the busbar bracket. It can reduce the amount of crossbeam cutting while satisfying the conduction between adjacent battery cells on both sides of the crossbeam, ensuring the battery pack mode. Thus, while ensuring the quality of the battery pack, a cost reduction design can be achieved, improving the market competitiveness of the whole pack.

[0022] Secondly, the bottom of the first busbar and the bottom surface of the second busbar are arranged above the bottom surface of the busbar bracket. Such an arrangement can set the distance between the bottom surfaces of the busbars and the inner bottom surface of the battery pack after the busbar assembly is assembled into the battery pack to meet the requirements of electrical clearance and creepage distance. The extension part provided with the temperature detection unit is arranged in the middle of the flexible circuit board, which can make the temperature acquisition position at the middle position on the side of the battery cell, away from the heat source, and thus can accurately collect the true temperature of the battery cell module, which is beneficial to giving full play to the charging capacity of the battery cell.

[0023] Furthermore, by providing the installation groove and the opening, the protection of the temperature detection unit can be achieved. The setting of the foam can further protect the temperature detection unit of the limiting frame. By filling the heat-conducting glue in the limiting frame, the elastic property of the heat-conducting glue can form a buffering and protective effect on the temperature detection unit, and also ensure the accuracy of the measured temperature. The setting of the heat-conducting sheet can accelerate the heat transfer and improve the heat dissipation efficiency of the battery cell.

[0024] Moreover, through the setting of the first limiting structure and the second limiting structure, the Z-direction positioning of the second busbar can be realized, thus avoiding the skew of the busbar. At the same time, by providing the first observation hole, it is convenient to set the position of the foam and the temperature detection unit. The setting of the second observation hole can avoid welding without aligning the pole columns, so as to ensure that there is no welding deviation during welding, reduce the risks of explosion welding and false welding, thus avoiding the scrapping of the module and improving the welding yield. The second observation hole is set in a long strip hole shape, which can take pictures and address the pole columns of battery cells with different gaps to align the pole columns with the busbar and ensure the welding yield.

[0025] In addition, another object of the present invention is to provide a battery pack, and the busbar assembly as described above is provided in the battery pack.

[0026] The battery pack and the above-mentioned busbar assembly of the present invention have the same beneficial effects as compared with the traditional technology, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0028] Figure 1 is the overall structural schematic diagram of the busbar assembly according to the embodiment of the present invention;

[0029] Figure 2 is Figure 1 the schematic diagram of the structure shown from another perspective;

[0030] Figure 3 isFigure 2 An enlarged view of the structure shown at A in the figure;

[0031] Figure 4 An exploded view of the busbar assembly according to the embodiment of the present utility model;

[0032] Figure 5 An assembly schematic diagram of the temperature-sensitive bracket and the busbar bracket according to the embodiment of the present utility model;

[0033] Figure 6 A structural schematic diagram of the temperature-sensitive bracket according to the embodiment of the present utility model;

[0034] Figure 7 is Figure 6 A schematic diagram of the structure shown in another perspective;

[0035] Figure 8 A structural schematic diagram of the second busbar according to the embodiment of the present utility model;

[0036] Explanation of reference numerals:

[0037] 1. Busbar bracket; 11. Notch;

[0038] 2. Busbar assembly; 21. First busbar; 211. Third connection part; 212. Second avoidance groove; 22. Second busbar; 221. First connection part; 222. Second connection part; 223. First avoidance groove; 23. Second observation hole;

[0039] 3. Flexible circuit board; 31. Extension part; 311. Temperature detection unit; 312. Heat conduction sheet; 32. Nickel sheet;

[0040] 4. Temperature-sensitive bracket; 41. Installation groove; 411. Bottom of the groove; 42. Opening; 43. Limiting frame; 44. Foam; 45. First observation hole; 46. Thermal riveting point;

[0041] 51. First limiting structure; 511. First limiting protrusion; 52. Second limiting structure; 521. Second limiting protrusion;

[0042] 6. Electric core; 61. Terminal;

[0043] 7. Connector. Detailed implementation manners

[0044] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0045] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0046] Taking the busbar assembly described in the present utility model as an example, the orientation terms such as "upper, lower, left, right, front, and back" used in the embodiments are based on Figure 1 the up and down direction (also known as the height direction, or the overall Z direction), the left and right direction (also known as the width direction, or the overall Y direction), and the front and back direction (also known as the length direction, or the overall X direction) shown in

[0047] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installed", "connected", "connected", and "connecting parts" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0048] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0049] Embodiment 1

[0050] This embodiment relates to a busbar assembly, which can solve the problems of serious waste of flexible circuit boards and high cost of the busbar assembly, so as to facilitate cost reduction while ensuring the battery pack mode.

[0051] In terms of the overall structure, as Figures 1 to 8 shown in , the busbar assembly of this embodiment includes a busbar bracket 1, and a busbar assembly 2 and a flexible circuit board 3 provided on the busbar bracket 1. Along the height direction of the busbar bracket 1, the flexible circuit board 3 is located above the busbar assembly 2.

[0052] Among them, the busbar assembly 2 includes a first busbar 21 and a second busbar 22 provided on the busbar bracket 1. Both the first busbar 21 and the second busbar 22 are used for electrical connection between two adjacent battery cells 6. A first avoidance groove 223 with an open bottom is provided on the second busbar 22. The first avoidance groove 223 is used to avoid the cross beam of the battery pack, and a notch 11 corresponding to the first avoidance groove 223 is provided on the busbar bracket 1.

[0053] At this time, with the above settings, the flexible circuit board 3 is arranged above the bus bar assembly 2, which can simplify the structure of the flexible circuit board 3. Without the need to design it into a complex shape, the existing corresponding functions can be realized, which is beneficial to reducing the material waste of the flexible circuit board 3, increasing the utilization rate of the flexible circuit board 3, and reducing costs. At the same time, the second bus bar 22 is provided with an avoidance groove, and the bus bar bracket 1 is provided with a notch 11 corresponding to the avoidance groove. It can reduce the amount of crossbar cutting while meeting the electrical conduction between adjacent battery cells 6 on both sides of the crossbar, ensuring the battery pack mode. Thus, while ensuring the quality of the battery pack, a cost reduction design can be achieved, improving the market competitiveness of the entire pack.

[0054] It should be noted that both the first bus bar 21 and the second bus bar 22 are connected to the flexible circuit board 3 through nickel sheets 32. At the same time, the bus bar bracket 1 can be made of an insulating material well-known to those skilled in the art, such as plastic material.

[0055] And, in the specific structure, as Figure 8 shown, the second bus bar 22 can be set in a U shape, and has a first connecting portion 221 connected to the two bus bar brackets 1 divided by the crossbar, and a second connecting portion 222 for connecting the two first connecting portions 221. Each first connecting portion 221 extends along the height direction of the bus bar bracket 1. At the same time, the first bus bar 21 is composed of two third connecting portions 211 arranged in parallel.

[0056] At this time, the bottom of the pole 61 of the battery cell 6 is placed at the bottom, so that the second bus bar 22 can be raised as much as possible while meeting the overcurrent condition, thereby reducing the amount of crossbar cutting and increasing the mode of the entire pack.

[0057] Based on the above overall introduction, in this embodiment, as a preferred implementation form, as Figure 2 shown, along the height direction of the bus bar bracket 1, the bottom of the first bus bar 21 and the bottom surface of the second bus bar 22 are located above the bottom surface of the bus bar bracket 1, and the flexible circuit board 3 is in a strip shape.

[0058] The advantage of such a setting is that after assembling the bus bar assembly into the battery pack, the distance between the bottom surfaces of each bus bar and the inner bottom surface of the battery pack is set to meet the requirements of electrical clearance and creepage distance.

[0059] Furthermore, as a preferred implementation form, as Figure 3 、 Figure 4 and Figure 8As shown, in this embodiment, second observation holes 23 for observing the pole posts 61 of the battery cells 6 are provided on both the first bus bar 21 and the second bus bar 22. Thus, it is possible to avoid welding without aligning the pole posts 61, ensuring that there is no welding deviation during welding, reducing the risks of explosion welding and false welding, thereby avoiding module scrapping and improving the welding yield.

[0060] Specifically, in this embodiment, as a preferred implementation form, as shown in the figure, the second observation hole 23 is a long strip hole. At the same time, along the length direction of the bus bar bracket 1, plug connectors 7 for connecting to the battery management system of the battery pack are respectively provided at both ends of the flexible circuit board 3.

[0061] Here, setting the second observation hole 23 as a long strip hole can take pictures and address the pole posts 61 of the battery cells 6 with different gaps, so that the pole posts 61 are aligned with the bus bar, ensuring the welding yield. Of course, in addition to setting the second observation hole 23 as a long strip hole, it can also be set as other common shapes, such as a long waist hole or an oblong hole, etc., as long as it can meet the requirement of taking pictures and addressing the pole posts 61 of the battery cells 6 with different gaps.

[0062] In addition, in the prior art, in order to ensure the charging performance of the battery pack, a temperature acquisition device is provided, and the position of the temperature acquisition device is also crucial for the design of the battery pack. If the collected temperature is too low, a large-rate current will be used during the charging process. If the actual temperature of the battery cell is too high, it will affect the battery cell life, and in severe cases, even lead to thermal runaway; if the collected temperature is too high and the actual temperature of the battery cell is relatively low, a small-rate current will be used during the charging process, which will affect the charging duration and cannot fully utilize the charging capacity of the battery cell.

[0063] In this embodiment, as a preferred implementation form, as Figure 3 、 Figure 4 and Figure 5 shown, along the length direction of the bus bar bracket 1, a downward-extending extension 31 is provided in the middle of the flexible circuit board 3, and a temperature detection unit 311 for detecting the temperature of the battery cell 6 is provided on the extension 31.

[0064] With this setting, the temperature acquisition position can be at the middle position on the side of the battery cell 6, away from the heat source, and thus can more accurately collect the true temperature of the battery cell module, which is beneficial to fully utilize the charging capacity of the battery cell 6.

[0065] At the same time, continuing to refer to Figure 3 shown, a second avoidance groove 212 for avoiding the extension 31 is provided on the bus bar assembly 2. The setting of the second avoidance groove 212 is reasonable in structure, which is beneficial to forming an avoidance for the extension 31 and saving the layout space.

[0066] During specific implementation, the specific positions of the extension part 31 and the temperature detection unit 311 can be at the equal division points of the length of the battery cell module. As the length of the battery cell module increases, more equal division points need to be set, such as three equal division points (corresponding to three temperature detection units 311), four equal division points (corresponding to four temperature detection units 311), etc.

[0067] Moreover, in this embodiment, as a preferred implementation form, referring to Figure 3 and Figure 7 as shown in, a temperature sensing bracket 4 is provided between the bus bar bracket 1 and the bus bar assembly 2. An installation groove 41 corresponding to the extension part 31 is provided on the side of the temperature sensing bracket 4 facing the bus bar bracket 1.

[0068] Among them, an opening 42 corresponding to the installation groove 41 is provided on the bus bar bracket 1. The temperature detection unit 311 is located in the installation space formed by the opening 42 and the installation groove 41. Here, by providing the installation groove 41 and the opening 42, the protection of the temperature detection unit 311 can be realized.

[0069] During specific implementation, the temperature sensing bracket 4 is injection molded, and its surface fits with the bus bar bracket 1. By means of thermal riveting connection, the temperature sensing bracket 4, the bus bar bracket 1 and the bus bar assembly 2 are connected in sequence. Moreover, thermal riveting points 46 are provided at both ends of the temperature sensing bracket 4. Since the temperature sensing bracket 4 occupies a certain space, during its installation, one end is thermally riveted on the third connecting part 211 on the right side of the second avoidance groove 212 (i.e., the third connecting part 211 on the right side of the first bus bar 21 at the position of the temperature sensing bracket 4), and the other end is thermally riveted on the third connecting part 211 on the right side of the adjacent first bus bar 21.

[0070] Secondly, one end of the temperature sensing bracket 4 can also be thermally riveted on the third connecting part 211 on the left side of the second avoidance groove 212 (i.e., the third connecting part 211 on the left side of the first bus bar 21 at the position of the temperature sensing bracket 4). At this time, the other end is thermally riveted on the first connecting part 221 on the left side of the adjacent second bus bar 22.

[0071] In addition, in this embodiment, as a preferred implementation form, as Figure 5 shown in, a limiting frame 43 located in the installation space is provided between the temperature sensing bracket 4 and the flexible circuit board 3. The temperature detection unit 311 is located in the limiting frame 43, and a foam 44 is provided between the limiting frame 43 and the bottom 411 of the installation groove 41.

[0072] Here, by providing the limiting frame 43, the temperature detection unit 311 can be prevented from being scratched, and by providing the foam 44 between the limiting frame 43 and the bottom 411 of the installation groove 41, further protection can be provided for the temperature detection unit 311 of the limiting frame.

[0073] During specific implementation, the limiting frame is connected to the flexible circuit board 3 by bonding, and then the temperature detection unit 311 is integrated with the flexible circuit board 3. At this time, adhesive layers are provided on both sides of the foam 44, and the foam 44 is fixedly bonded to the bottom 411 of the installation groove 41 and between the foam 44 and the limiting frame. Subsequently, they are thermally riveted together with the busbar assembly 2 and the busbar bracket 1.

[0074] Of course, in addition to bonding, other common connection methods can also be used between the limiting frame and the flexible circuit board 3, such as welding. At the same time, the specific structure of the limiting frame 43 can adopt the structure well-known to those skilled in the art, such as a loop frame structure.

[0075] It should be noted that in order to facilitate the bonding and fixing of the foam 44, the above-mentioned opening 42 is provided on the busbar bracket 1. At this time, a part of the limiting frame penetrates through the opening 42, thereby playing a certain protective role for the temperature detection unit 311 within the limiting frame and preventing the limiting frame from detaching from the flexible circuit board 3 during the installation process due to extrusion.

[0076] Moreover, considering the heat conduction requirement of the temperature detection unit 311, in this embodiment, as a preferred implementation form, the limiting frame 43 is filled with thermal conductive adhesive. The elastic property of the thermal conductive adhesive can form a buffer protection for the temperature detection unit 311 and also ensure the accuracy of the measured temperature.

[0077] Meanwhile, still Figure 5 As shown in the figure, a heat conduction sheet 312 is provided on the side of the extension part 31 away from the temperature detection unit 311. During specific implementation, the heat conduction sheet 312 can adopt heat conduction products well-known to those skilled in the art, such as aluminum sheets. Adhesive layers are provided on both sides of the heat conduction sheet 312. One side is bonded to the extension part 31 of the flexible circuit board 3, and the other side is bonded to the battery cell 6 corresponding to the extension part 31, thereby being able to accelerate heat transfer and improve the heat dissipation efficiency of the battery cell 6.

[0078] In addition, in this embodiment, as a preferred implementation form, as Figure 3 and Figure 6 shown in the figure, a first limiting structure 51 is provided on the temperature sensing bracket 4, and a second limiting structure 52 is provided on the busbar bracket 1. In the height direction of the busbar bracket 1, the first limiting structure 51 and the second limiting structure 52 jointly limit the second busbar 22.

[0079] Here, through the setting of the first limiting structure 51 and the second limiting structure 52, the Z-direction positioning of the second busbar 22 can be realized, thereby preventing the busbar from being skewed. And by providing the first observation hole 45, it is convenient to set the position of the foam 44 and the temperature detection unit 311.

[0080] In the specific structure, the first limiting structure 51 includes a first limiting protrusion 511 provided on the temperature sensing bracket 4, and the second limiting structure 52 includes a second limiting protrusion 521 provided on the busbar bracket 1. When limiting the busbar assembly 2, the first limiting protrusion 511 limits the thickness direction of the second busbar 22 (i.e., Figure 1 the left - right direction shown in

[0081] ), and the second limiting protrusion 521 abuts against the bottom of the second busbar 22 to achieve the Z - direction positioning of the second busbar 22, which can avoid the skew of the second busbar 22. Figure 6 and Figure 7 shown in, a first observation hole 45 is provided on the temperature sensing bracket 4, and the first observation hole 45 is used to observe the setting positions of the foam 44 and the temperature detection unit 311. In the specific structure, in order to confirm whether the temperature detection unit 311 is pasted in place, it is necessary to observe through the first observation hole 45. At this time, due to the extrusion of the temperature detection unit 311 on the foam 44, most of the time, the position of the temperature detection unit 311 can be vaguely seen, so that the pasting position of the temperature detection unit 311 can be confirmed.

[0082] When the busbar assembly of this embodiment is in use, the flexible circuit board 3 is arranged above the busbar assembly 2, which can simplify the structure of the flexible circuit board 3, is conducive to reducing the waste of the flexible circuit board 3 material, increasing the utilization rate of the flexible circuit board 3, reducing costs, and moreover, an avoidance groove is provided on the second busbar 22, and a notch 11 corresponding to the avoidance groove is provided on the busbar bracket 1, which can reduce the cross - beam cutting amount while satisfying the conduction between adjacent battery cells 6 on both sides of the cross - beam, and ensure the battery pack mode. Thus, while ensuring the quality of the battery pack, a cost - reduction design can be achieved.

[0083] Furthermore, the limiting frame 43 is bonded to the extension part 31 of the flexible circuit board 3 to integrate the temperature detection unit 311 with the extension part 31 of the flexible circuit board 3. Secondly, the foam 44 is bonded between the limiting frame 43 and the bottom 411 of the installation groove 41, and then they are thermally riveted together with the busbar assembly 2 and the busbar bracket 1.

[0084] After the above operations are completed, the busbar assembly 2 is connected to the flexible circuit board 3 through the nickel sheet 32, and is connected to the battery management system of the battery pack through the plug - in connectors 7 at both ends of the flexible circuit board 3. At this time, after the temperature detection unit 311 detects the temperature, the flexible circuit board 3 collects the temperature signal detected by the temperature detection unit 311 and transmits it to the battery management system, which is conducive to giving full play to the charge - discharge capacity of the battery cell 6.

[0085] Embodiment Two

[0086] This embodiment also relates to a battery pack, and the busbar assembly in Embodiment One is provided in this battery pack.

[0087] The battery pack described in this embodiment can achieve cost reduction design and improve the market competitiveness of the whole pack while ensuring the quality of the battery pack by setting the busbar assembly in Embodiment 1.

[0088] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A busbar assembly, characterized in that: it includes a busbar bracket, a busbar assembly and a flexible circuit board provided on the busbar bracket, and along the height direction of the busbar bracket, the flexible circuit board is located above the busbar assembly; the busbar assembly includes a first busbar and a second busbar provided on the busbar bracket, and both the first busbar and the second busbar are used for electrical connection between two adjacent battery cells; a first avoidance groove with an open bottom is provided on the second busbar, the first avoidance groove is used to avoid the cross beam of the battery pack, and a notch corresponding to the first avoidance groove is provided on the busbar bracket.

2. The busbar assembly according to claim 1, characterized in that: along the height direction of the busbar bracket, the bottom of the first busbar and the bottom surface of the second busbar are located above the bottom surface of the busbar bracket; and / or, the flexible circuit board is in a long strip shape.

3. The busbar assembly according to claim 1, characterized in that: along the length direction of the busbar bracket, an extension part extending downward is provided in the middle of the flexible circuit board, and a temperature detection unit for detecting the temperature of the battery cell is provided on the extension part; a second avoidance groove for avoiding the extension part is provided on the busbar assembly.

4. The busbar assembly according to claim 3, characterized in that: a temperature sensing bracket is provided between the busbar bracket and the busbar assembly, and an installation groove corresponding to the extension part is provided on the side of the temperature sensing bracket facing the busbar bracket; an opening corresponding to the installation groove is provided on the busbar bracket, and the temperature detection unit is located in the installation space formed by the opening and the installation groove.

5. The busbar assembly according to claim 4, characterized in that: a limiting frame located in the installation space is provided between the temperature sensing bracket and the flexible circuit board, the temperature detection unit is located in the limiting frame, and a foam is provided between the limiting frame and the bottom of the installation groove.

6. The busbar assembly according to claim 5, characterized in that: the limiting frame is filled with thermal conductive glue; and / or, a heat conducting sheet is provided on the side of the extension part away from the temperature detection unit.

7. The busbar assembly according to claim 5, characterized in that: a first limiting structure is provided on the temperature sensing bracket, and a second limiting structure is provided on the busbar bracket. In the height direction of the busbar bracket, the first limiting structure and the second limiting structure jointly constitute the limitation of the second busbar; and / or, a first observation hole is provided on the temperature sensing bracket, and the first observation hole is used to observe the setting positions of the foam and the temperature detection unit.

8. The busbar assembly according to any one of claims 1 to 7, characterized in that: second observation holes for observing the pole columns of the battery cells are provided on both the first busbar and / or the second busbar.

9. The busbar assembly according to claim 8, characterized in that: The second observation hole is a long strip hole; and / or, along the length direction of the bus bar bracket, plug connectors for connecting with the battery management system of the battery pack are respectively arranged at both ends of the flexible circuit board.

10. A battery pack, characterized in that: The battery pack is provided with the bus bar assembly according to any one of claims 1 to 9.

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