Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack which comprises a box body, the cover plate is connected with the box body, and the cover plate and the box body define a containing cavity; the battery pack is arranged in the accommodating cavity and comprises a plurality of battery cells, and the battery cells are provided with pole columns; the isolation plate is arranged in the containing cavity and located between the battery pack and the cover plate, a positioning groove is formed in the side, facing the cover plate, of the isolation plate, and the positioning groove comprises a hollow hole and a first groove; the busbar is located on the side, facing the cover plate, of the isolation plate and comprises a bent section and two welding sections, the two ends of the bent section are each connected with one welding section, the bent section protrudes towards the side where the battery pack is located relative to the welding sections, the welding sections are each provided with a welding area, and the two welding areas correspond to the two hollowed-out holes one to one and are connected with the pole columns respectively; the bending section and the welding section are located in the same positioning groove, and the bending section is located in the first groove. According to the battery pack, the first groove is formed in the bottom wall of the positioning groove of the isolation plate and is used for accommodating the bent section of the busbar, so that double positioning of the busbar is realized.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery packs. Background Technology

[0002] Battery packs in related technologies typically include busbars and cells. The busbars are connected to the terminals of the cells to achieve electrical connection between adjacent cells. However, during assembly, positioning between the busbars and cells is inconvenient, and misalignment may occur between the busbars and cells. Utility Model Content

[0003] In view of this, the present invention provides a battery pack to solve the problem of possible misalignment between the busbar and the battery cell.

[0004] In a first aspect, this utility model provides a battery pack having a first direction, comprising: a housing; a cover plate connected to one side of the housing along the first direction and forming a receiving cavity with the housing; a battery pack disposed within the receiving cavity, the battery pack comprising multiple battery cells, each battery cell having a terminal post on its end face facing the cover plate; and a separator plate disposed within the receiving cavity and located between the battery pack and the cover plate, the separator plate comprising positioning grooves, perforated holes, and a first groove, wherein there are multiple positioning grooves disposed on one side of the separator plate facing the cover plate along the first direction, and the perforated holes and the first groove are located at the bottom of the positioning grooves; in the same positioning groove, there are two perforated holes, and the two perforated holes and the first groove are... A groove is provided at intervals, and the hollow hole penetrates the separator plate along the first direction and communicates with the positioning groove, and the first groove is located between the two hollow holes; multiple busbars are all located on the side of the separator plate facing the cover plate, each busbar includes a bent section and two welding sections, each end of the bent section is connected to a welding section, the bent section protrudes towards the side of the battery pack relative to the welding section, and both welding sections are provided with welding areas on the side facing the battery pack, the welding areas of the welding sections are arranged opposite to the hollow holes one by one along the first direction and are respectively connected to the terminals of the battery cells, the bent section and the welding section are both located in the same positioning groove, and the bent section is located in the first groove.

[0005] Beneficial effects: By setting the positioning groove, the relative position between the busbar and the separator plate can be fixed. By providing a bent section on the busbar, when the terminal of an adjacent cell pulls on the busbar, the bent section can extend to compensate for the extension size of the busbar, preventing damage to the busbar or separation from the terminal. By setting the first groove, the bent section can be accommodated, achieving dual positioning between the busbar and the separator plate. The positioning reliability between the busbar and the separator plate is higher, which helps to prevent misalignment between the busbar and the cell, improving the positioning accuracy and connection reliability between the busbar and the cell.

[0006] In one optional embodiment, the welding areas of the two welding segments are a first welding area and a second welding area, respectively, and along the length direction of the busbar, the distance between the bent segment and the first welding area is greater than the distance between the bent segment and the second welding area.

[0007] Beneficial effects: The distance between the middle bending section and the welding areas on both sides is not the same, and the bending section is set in accordance with the first groove, which makes it easier to assemble the busbar onto the isolation plate in the predetermined direction and prevents the busbar from being installed backwards.

[0008] In one alternative implementation, along the first direction, the side of the busbar facing the cover plate is accommodated within the positioning groove.

[0009] Beneficial effects: It can effectively prevent the busbar from contacting the cover plate, prevent the cover plate from becoming charged, and improve the safety of the battery pack.

[0010] In one alternative embodiment, the busbar has an insulating layer on the side facing the cover plate.

[0011] Beneficial effects: It can insulate the busbar and the cover plate, prevent the cover plate from becoming charged, and improve the safety of the battery pack.

[0012] In one optional embodiment, the battery pack has a second direction intersecting the first direction, and the battery pack further includes: an insulating strip disposed between the busbar and the cover plate, the insulating strip extending along the second direction, and there are multiple busbars spaced apart along the second direction, the insulating strip being connected to the multiple busbars.

[0013] Beneficial effects: It can isolate the busbar and the cover plate, reduce the probability of contact between the busbar and the cover plate, prevent the cover plate from becoming charged, and improve the safety of the battery pack.

[0014] In one optional embodiment, a positioning post is provided on the side of the bottom of the positioning groove facing the cover plate. The positioning post extends toward the cover plate and is spaced apart from the first groove and the hollow hole. The welding section is provided with a positioning hole that passes through it, and the positioning post passes through the positioning hole.

[0015] Beneficial effects: It enables pre-positioning between the isolation plate and the busbar, improving the connection strength and installation accuracy between the isolation plate and the busbar.

[0016] In one optional embodiment, the bottom of the positioning groove is recessed to the side away from the cover plate to form a second groove, the second groove being spaced apart from the first groove and the hollow hole, and the positioning post being located in the second groove.

[0017] Beneficial effects: It reduces the size of the positioning post protruding from the bottom of the positioning groove, and the bottom of the positioning post is surrounded by the groove wall of the second groove, which increases the structural strength at the connection between the positioning post and the bottom of the positioning groove.

[0018] In one alternative embodiment, the battery pack further has a third direction intersecting the first direction and the second direction, the bent segment being connected to two welded segments at opposite ends along the third direction, and there are multiple positioning posts located on one side of the positioning groove along the second direction.

[0019] Beneficial effects: Improves the connection strength between the isolation plate and the busbar, facilitates the processing of multiple positioning posts, and improves production efficiency.

[0020] In one optional embodiment, the positioning groove is provided with a glue leakage hole along the side wall in the second direction, and the glue leakage hole extends to the bottom of the positioning groove.

[0021] Beneficial effect: It can inject adhesive through the glue leakage hole into the space between the busbar and the battery cell, reducing the probability of relative displacement between the busbar and the battery cell.

[0022] In one optional embodiment, the bottom wall of the positioning groove is provided with a glue leakage hole, the glue leakage hole is located in the first groove and penetrates the partition plate along the first direction, the busbar is provided with a through hole, the through hole is located in the bending section and penetrates the busbar along the first direction, and the through hole communicates with the glue leakage hole.

[0023] Beneficial effects: It can inject adhesive between the busbar and the battery cell through the via and the adhesive leakage hole, reducing the probability of relative displacement between the busbar and the battery cell. Attached Figure Description

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

[0025] Figure 1 This is a schematic diagram of the battery pack structure according to an embodiment of the present invention;

[0026] Figure 2 This is an exploded view of the battery pack according to an embodiment of the present invention;

[0027] Figure 3 for Figure 2 A magnified view of a portion of region A in the middle;

[0028] Figure 4 This is a schematic diagram of the busbar structure according to an embodiment of the present invention;

[0029] Figure 5 This is one of the structural schematic diagrams of the isolation plate according to an embodiment of the present utility model;

[0030] Figure 6 This is a second schematic diagram of the structure of the isolation plate according to an embodiment of the present utility model;

[0031] Figure 7 for Figure 6 A magnified view of a portion of region B in the middle;

[0032] Figure 8 This is the third schematic diagram of the structure of the isolation plate according to an embodiment of the present utility model;

[0033] Figure 9 for Figure 8 A magnified view of a portion of region C in the middle;

[0034] Figure 10 This is a schematic diagram showing the connection between the isolation plate and the flexible circuit board in an embodiment of the present invention;

[0035] Figure 11 This is a schematic diagram of the battery cell structure according to an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Battery pack;

[0038] 100. Box body; 101. Receiving cavity; 102. Cover plate;

[0039] 200. Battery pack; 210. Battery cell; 211. Terminal post;

[0040] 300. Isolation plate; 330. Positioning groove; 331. Positioning post; 332. First groove; 333. Second groove; 334. Notch; 335. Hollow cavity; 337. Glue leakage hole; 338. Hole;

[0041] 400. Flexible circuit board; 403. Electrical signal acquisition terminal;

[0042] 500. Insulating strip;

[0043] 700, Busbar; 710, Bend Section; 720, Positioning Hole; 730, Insulation Layer; 740, Through Hole; 750, Welding Section; 751, Welding Zone; 7511, First Welding Zone; 7512, Second Welding Zone. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0045] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0046] In the description of this utility model, "a plurality of" means two or more. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] The following is combined with Figures 1-11 The embodiments of the present invention are described below.

[0049] According to an embodiment of the present invention, in a first aspect, a battery pack 1 is provided, the battery pack 1 having a first direction Z, the battery pack 1 including a housing 100, a cover plate 102, a battery pack 200 and a busbar 700.

[0050] The housing 100 is connected to the cover plate 102 along one side of the first direction Z, and the cover plate 102 and the housing 100 enclose a receiving cavity 101. The battery pack 200 is located within the receiving cavity 101 and includes multiple battery cells 210, each battery cell 210 having a terminal post 211 on its end face facing the cover plate 102. The separator 300 is located within the receiving cavity 101 and is disposed between the battery pack 200 and the cover plate 102. The separator 300 can be made of an insulating material, such as insulating plastic, and can separate the battery pack 200 from the cover plate 102, preventing electrical connection between the battery pack 200 and the cover plate 102 and improving the safety of the battery pack 1.

[0051] The isolation plate 300 includes a positioning groove 330, a perforated hole 338, and a first groove 332. There are multiple positioning grooves 330 and they are located on the side of the isolation plate 300 facing the cover plate 102 along the first direction Z. The perforated hole 338 and the first groove 332 are located at the bottom of the positioning groove 330. In the same positioning groove 330, there are two perforated holes 338, and the two perforated holes 338 and the first groove 332 are spaced apart. The perforated holes 338 penetrate the isolation plate 300 along the first direction Z and communicate with the positioning groove 330. The first groove 332 is located between the two perforated holes 338.

[0052] The positioning groove 330 is recessed in the first direction Z away from the cover plate 102, and the pole post 211 can be inserted into the hollow hole 338. The bottom part of the positioning groove 330 is recessed in the direction away from the cover plate 102 to form a first groove 332.

[0053] Multiple busbars 700 are located on the side of the separator 300 facing away from the battery pack 200. Each busbar 700 includes a bent section 710 and two welding sections 750. Each end of the bent section 710 is connected to a welding section 750. The bent section 710 protrudes towards the side of the battery pack 200 relative to the welding sections 750. Each of the two welding sections 750 has a welding area 751 on the side facing the battery pack 200. The welding areas 751 of the welding sections 750 are aligned one-to-one with the perforated holes 338 along the first direction Z and are connected to the terminals 211 of the battery cells 210. The bent section 710 and the two welding sections 750 are all located within the same positioning groove 330, and the bent section 710 is located within the first groove 332.

[0054] Specifically, the busbar 700 is connected to the positive terminal 211 of one battery cell 210 and the busbar 700 is connected to the negative terminal 211 of another battery cell 210 to achieve series connection between two adjacent battery cells 210.

[0055] By setting the positioning slot 330, the busbar 700 and the isolation plate 300 can be pre-positioned, making the installation of the busbar 700 and the isolation plate 300 convenient and with high positioning accuracy. Furthermore, the busbar 700 and the isolation plate 300 can be arranged in the battery pack 1 at one time, making the assembly of the battery pack 1 simpler and improving production efficiency.

[0056] During the application of battery pack 1, the cell 210 may expand, which will increase the distance between the terminals 211 of two adjacent cells 210 and pull on the busbar 700. By setting a bending section 710, the bending section 710 can be stretched to compensate for the deformation of the busbar 700, avoid damage to the busbar 700 or separation of the busbar 700 from the terminals 211, ensure the reliability of the connection between the busbar 700 and the terminals 211, and reduce the probability of damage to the busbar 700.

[0057] By setting the first groove 332, the bent section 710 can be accommodated, avoiding the presence of the bent section 710 from increasing the gap between the bottom of the busbar 700 and the positioning groove 330, ensuring the stability of the busbar 700 within the first groove 332, and enabling dual positioning of the busbar 700 and the isolation plate 300, thereby improving the positioning reliability between the busbar 700 and the isolation plate 300, and ensuring the connection accuracy between the busbar 700 and the terminal post 211 of the cell 210.

[0058] like Figure 4As shown, along the length of the busbar 700, the distance between the bent section 710 and one of the two welding areas 751 is greater than the distance between the bent section 710 and the other. For example, if one welding area 751 is defined as the first welding area 7511 and the other welding area 751 is defined as the second welding area 7512, along the length of the busbar 700, the distance between the bent section 710 and the first welding area 7511 is greater than the distance between the bent section 710 and the second welding area 7512. This provides a foolproof design for the assembly of the busbar 700 and the partition plate 300, preventing directional misinstallation between the busbar 700 and the partition plate 300 and improving installation positioning accuracy.

[0059] like Figure 3 As shown, in this embodiment, along the first direction Z, the side of the busbar 700 facing the cover plate 102 is accommodated within the positioning groove 330. That is, the side of the separator 300 facing the separator 300 extends beyond the side of the busbar 700 facing the cover plate 102. The dimension of the busbar 700 along the first direction Z is smaller than the dimension of the positioning groove 330 along the first direction Z, and the thickness of the busbar 700 is smaller than the depth of the positioning groove 330. In this way, the busbar 700 can be completely located within the positioning groove 330, thereby effectively preventing the busbar 700 from contacting the cover plate 102, preventing the cover plate 102 from becoming charged, and improving the safety of the battery pack 1.

[0060] like Figure 4 As shown, in the technical solution of this embodiment, the busbar 700 is provided with an insulating layer 730 on the side facing away from the isolation plate 300. The insulating layer 730 is made of insulating material. The insulating layer 730 can be bonded to the side of the busbar 700 facing away from the isolation plate 300, or the insulating layer 730 can be formed on the side of the busbar 700 facing away from the isolation plate 300 by spraying.

[0061] By providing the insulation layer 730, the busbar 700 and the cover plate 102 can be isolated, thus insulating the busbar 700 and the cover plate 102 and further preventing electrical connection between the busbar 700 and the cover plate 102, effectively improving the safety of the battery pack 1.

[0062] like Figure 2 and Figure 3 As shown, in the technical solution of this embodiment, the battery pack 1 has a second direction Y intersecting the first direction Z. The battery pack 1 also includes an insulating strip 500, which is disposed between the busbar 700 and the cover plate 102. The insulating strip 500 extends along the second direction Y. There are multiple busbars 700, which are arranged at intervals along the second direction Y. The insulating strip 500 is connected to the multiple busbars 700.

[0063] The insulating strip 500 can be made of insulating rubber or insulating silicone or other materials.

[0064] By setting the insulating strip 500, on the one hand, the busbar 700 is separated from the cover plate 102 to prevent the busbar 700 and the cover plate 102 from making contact and conducting electricity. On the other hand, the insulating strip 500 can undergo elastic deformation to adapt to the gap between the busbar 700 and the cover plate 102, reduce the impact of processing errors or assembly errors, and improve production efficiency and yield.

[0065] like Figures 3-5 As shown, in the technical solution of this embodiment, a positioning post 331 is provided on the side of the bottom of the positioning groove 330 facing the cover plate 102. The positioning post 331 extends towards the cover plate 102. The positioning post 331 is spaced apart from the first groove 332 and the hollow hole 338. The welding section 750 is provided with a positioning hole 720. The positioning hole 720 is spaced apart from the bending section 710. The positioning post 331 passes through the positioning hole 720.

[0066] Among them, after the positioning post 331 passes through the positioning hole 720, the positioning post 331 can be heat-fused. The end of the positioning post 331 away from the isolation plate 300 can be fixed to the side of the busbar 700 facing away from the isolation plate 300 to achieve positioning between the busbar 700 and the isolation plate 300.

[0067] By setting the positioning post 331, the pre-positioning between the isolation plate 300 and the busbar 700 can be achieved, thereby improving the connection strength and installation accuracy between the isolation plate 300 and the busbar 700.

[0068] Specifically, such as Figures 6-9 As shown, the positioning post 331 may have a hollow cavity 335, with the opening of the hollow cavity 335 located at the lower end of the positioning post 331. This reduces material usage and weight, and facilitates the subsequent hot-melt deformation of the positioning post 331, reducing processing difficulty and improving production efficiency.

[0069] like Figure 5 and Figure 9 As shown, in the technical solution of this embodiment, the bottom of the positioning groove 330 is recessed on the side away from the cover plate 102 to form a second groove 333. The second groove 333 is spaced apart from the first groove 332 and the hollow hole 338, and the positioning post 331 is located in the second groove 333.

[0070] By setting the second groove 333, the area where the positioning post 331 is located forms a concave-convex structure, which can increase the structural strength of the bottom of the positioning groove 330 in the area where the positioning post 331 is located. Furthermore, the end of the positioning post 331 connected to the bottom of the positioning groove 330 is surrounded by the groove wall of the second groove 333, which can further improve the connection reliability between the positioning post 331 and the isolation plate 300. In addition, the size of the positioning post 331 protruding from the bottom of the positioning groove 330 is reduced, which reduces the probability of the positioning post 331 breaking.

[0071] like Figure 7 As shown, in the technical solution of this embodiment, the battery pack 1 also has a third direction X intersecting the first direction Z and the second direction Y. The bent section 710 is connected to two welding sections 750 at opposite ends along the third direction X, and there are multiple positioning posts 331. By setting multiple positioning posts 331, the number of connection points between the busbar 700 and the separator 300 can be increased, thereby improving the connection strength between the separator 300 and the busbar 700.

[0072] In addition, multiple positioning posts 331 are located on one side of the positioning groove 330 along the second direction Y. This facilitates the hot melting of multiple positioning posts 331, improving production efficiency. Furthermore, the other side of the positioning groove 330 along the second direction Y has sufficient space. The portion of the groove wall of the positioning groove 330 along the other side of the second direction Y can be provided with a notch 334. The electrical signal acquisition terminal 403 of the flexible circuit board 400 of the battery pack 1 can be connected to the busbar 700 and the terminal post 211 through the notch 334 to realize the acquisition of electrical signals of the battery cell 210 and avoid interference between the electrical signal acquisition terminal 403 and the positioning post 331.

[0073] Specifically, such as Figure 3 and Figure 10 As shown, along the second direction Y, the positioning post 331 in each positioning groove 330 is arranged adjacent to the positioning post 331 in the positioning groove 330 on one side, and opposite to the positioning post 331 in the positioning groove 330 on the other side. Thus, the notch 334 of the positioning groove 330 is arranged adjacent to the notch 334 of the positioning groove 330 on the other side, allowing a flexible circuit board 400 to have electrical signal acquisition terminals 403 on both opposite sides along the second direction Y. The two electrical signal acquisition terminals 403, extending into the notches 334 of the two adjacent positioning grooves 330, reduce the number of parts and improve the convenience of electrical signal acquisition.

[0074] like Figure 7 As shown, in the technical solution of this embodiment, the positioning groove 330 is provided with a glue leakage hole 337 on the side wall along the second direction Y, and the glue leakage hole 337 extends to the bottom of the positioning groove 330.

[0075] In this way, adhesive can be injected into the space between the busbar 700 and the cell 210 through the adhesive leakage hole 337, reducing the probability of relative displacement between the busbar 700 and the cell 210. This helps to ensure the reliability of the relative position between the busbar 700 and the cell 210 and improves the structural strength of the battery pack 1.

[0076] like Figure 4 , Figure 5 and Figure 7As shown, in the technical solution of this embodiment, the bottom wall of the positioning groove 330 is provided with a glue leakage hole 337. The glue leakage hole 337 is located in the first groove 332 and penetrates the isolation plate 300 along the first direction Z. The busbar 700 is provided with a through hole 740. The through hole 740 is located in the bending section 710 and penetrates the busbar 700 along the first direction Z. The through hole 740 and the glue leakage hole 337 correspond to and communicate with each other along the first direction Z.

[0077] It should be noted that in some embodiments, the glue leakage hole 337 may be provided only on the bottom wall of the positioning groove 330, in other embodiments the glue leakage hole 337 may be provided only on the side wall of the positioning groove 330, and in some embodiments the glue leakage hole 337 may be provided on both the bottom wall and the side wall of the positioning groove 330.

[0078] In addition, the portion of the isolation plate 300 located in the second direction Y between two adjacent positioning grooves 330 may also be provided with glue leakage holes 337.

[0079] In this way, adhesive can be injected between the busbar 700 and the cell 210 through the through hole 740 and the adhesive leakage hole 337, reducing the probability of relative displacement between the busbar 700 and the cell 210, which helps to ensure the reliability of the relative position between the busbar 700 and the cell 210, and improves the structural strength of the battery.

[0080] Secondly, according to an embodiment of the present invention, an electrical device is provided, which includes the aforementioned battery pack 1. The electrical device can be a vehicle or an energy storage device, etc.

[0081] The electrical equipment of this utility model utilizes the aforementioned battery pack 1 and the isolation plate 300 to achieve dual positioning of the busbar 700, thereby ensuring the positioning reliability between the busbar 700 and the battery cell 210.

[0082] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack having a first orientation (Z), characterized in that, include: Box (100); The cover plate (102) is connected to one side of the box body (100) along the first direction (Z) and forms a receiving cavity (101) with the box body (100); A battery pack (200) is disposed in the receiving cavity (101). The battery pack (200) includes a plurality of cells (210), and the end face of the cells (210) facing the cover plate (102) has a terminal post (211). An isolation plate (300) is disposed within the receiving cavity (101) and located between the battery pack (200) and the cover plate (102). The isolation plate (300) includes a positioning groove (330), a hollow hole (338), and a first groove (332). There are multiple positioning grooves (330) and they are disposed on the side of the isolation plate (300) facing the cover plate (102) along the first direction (Z). The hollow hole (338) and the first groove (332) are located at the bottom of the positioning groove (330). In the same positioning groove (330), there are two hollow holes (338), and the two hollow holes (338) and the first groove (332) are spaced apart. The hollow hole (338) penetrates the isolation plate (300) along the first direction (Z) and communicates with the positioning groove (330). The first groove (332) is located between the two hollow holes (338). Multiple busbars (700) are located on the side of the separator plate (300) facing the cover plate (102). Each busbar (700) includes a bent section (710) and two welded sections (750). Each end of the bent section (710) is connected to one of the welded sections (750). The bent section (710) protrudes towards the side where the battery pack (200) is located relative to the welded sections (750). The two welded sections (750) face the side where the battery pack (200) is located. Each side of the battery pack (200) is provided with a welding area (751). The welding area (751) of the welding section (750) is arranged opposite to the hollow hole (338) along the first direction (Z) and is connected to the terminal post (211) of the cell (210). The bending section (710) and the welding section (750) are both located in the same positioning groove (330), and the bending section (710) is located in the first groove (332).

2. The battery pack according to claim 1, characterized in that, The welding areas (751) of the two welding segments (750) are the first welding area (7511) and the second welding area (7512), respectively. Along the length direction of the busbar (700), the distance between the bent segment (710) and the first welding area (7511) is greater than the distance between the bent segment (710) and the second welding area (7512).

3. The battery pack according to claim 1, characterized in that, Along the first direction (Z), the busbar (700) is received in the positioning groove (330) on the side facing the cover plate (102).

4. The battery pack according to claim 1, characterized in that, The busbar (700) has an insulating layer (730) on the side facing the cover plate (102).

5. The battery pack according to claim 1, characterized in that, Having a second direction (Y) intersecting the first direction (Z), characterized in that it further includes: An insulating strip (500) is disposed between the busbar (700) and the cover plate (102). The insulating strip (500) extends along the second direction (Y). A plurality of busbars (700) are arranged at intervals along the second direction (Y). The insulating strip (500) is connected to the plurality of busbars (700).

6. The battery pack according to claim 5, characterized in that, The bottom of the positioning groove (330) is also provided with a positioning post (331). The positioning post (331) extends towards the cover plate (102). The positioning post (331) is spaced apart from the first groove (332) and the hollow hole (338). The welding section (750) is provided with a positioning hole (720) that passes through it. The positioning post (331) passes through the positioning hole (720).

7. The battery pack according to claim 6, characterized in that, The bottom of the positioning groove (330) is recessed in the direction away from the cover plate (102) to form a second groove (333). The second groove (333) is spaced apart from the first groove (332) and the hollow hole (338). The positioning post (331) is located in the second groove (333).

8. The battery pack according to claim 6, characterized in that, It also has a third direction (X) intersecting the first direction (Z) and the second direction (Y), characterized in that the bent segment (710) is connected to two welding segments (750) at opposite ends along the third direction (X), and there are multiple positioning posts (331), which are located on one side of the positioning groove (330) along the second direction (Y).

9. The battery pack according to claim 8, characterized in that, The positioning groove (330) has a glue leakage hole (337) on its side wall along the second direction (Y), and the glue leakage hole (337) extends to the bottom of the positioning groove (330).

10. The battery pack according to claim 8, characterized in that, The bottom wall of the positioning groove (330) is provided with a glue leakage hole (337). The glue leakage hole (337) is located in the first groove (332) and penetrates the isolation plate (300) along the first direction (Z). The busbar (700) is provided with a through hole (740). The through hole (740) is located in the bending section (710) and penetrates the busbar (700) along the first direction (Z). The through hole (740) communicates with the glue leakage hole (337).

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