Busbar, battery module and battery pack

Abstract

The utility model relates to the technical field of batteries, and provides a busbar, a battery module and a battery pack, the busbar comprises a first connecting piece and a second connecting piece which are arranged along a first direction, and one ends of the first connecting piece and the second connecting piece, which are far away from each other, are respectively provided with a first connecting part and a second connecting part; the first connecting part and the second connecting part are used for respectively connecting two adjacent single batteries; one of the ends, close to each other, of the first connecting piece and the second connecting piece is provided with a clamping part, the other one of the ends, close to each other, of the first connecting piece and the second connecting piece is provided with a matching part, and the clamping part and the matching part are clamped in a matched mode in the second direction perpendicular to the first direction. The busbar is welded with the two single batteries along the first direction, and is clamped with each other along the second direction without interfering with each other, so that the busbar is convenient to install and maintain, the clamping can reduce the influence of welding on other batteries, and the safety of the batteries is improved.

Description

Technical Field

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

[0002] In the prior art, a pole is provided on the top cover of the battery, and a bus is welded on the pole. The bus is not an integrally formed sheet. One end of the bus is welded to one battery pole, and the other end is welded to another battery pole, thereby realizing electrical connection between the two batteries.

[0003] In this way, all the buses are welded after multiple batteries are grouped. However, welding slag is likely to occur during welding. During multiple welding, not only is it easy for the welding slag to contaminate the welded batteries, but it is also easy for the welding slag to spread to other batteries, thereby affecting the safety of the batteries and increasing the potential safety risks of the batteries. At the same time, after welding is completed, the batteries cannot be moved between each other, which is not conducive to maintenance or replacement. Utility Model Content

[0004] The utility model aims to provide a bus, a battery module and a battery pack, which are used to solve or at least partially solve the technical problems that the bus is difficult to install and maintain, and the bus welding slag is easy to contaminate other batteries.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] In the first aspect, the utility model provides a busbar, comprising a first connector and a second connector arranged along a first direction, wherein the first connector and the second connector are respectively provided with a first connecting portion and a second connecting portion at ends away from each other, and the first connecting portion and the second connecting portion are used to respectively connect two adjacent battery cells; one of the ends of the first connector and the second connector close to each other is provided with a clamping portion and the other is provided with a matching portion, and the clamping portion and the matching portion are matched and clamped along a second direction perpendicular to the first direction.

[0007] Optionally, a protrusion is convexly provided on a side surface of the clamping portion corresponding to the matching portion, and a groove is concavely provided on a side surface of the matching portion corresponding to the clamping portion, and the protrusion and the groove extend along the second direction so that the protrusion can be inserted into the groove along the second direction.

[0008] Optionally, an opening is provided at one end of the groove along the second direction, and a barrier is provided at the other end, so that the protrusion can be inserted into the groove from the opening and abut against the barrier; wherein a recessed portion for accommodating the barrier is provided at one end of the protrusion along the second direction.

[0009] Optionally, at least two of the protrusions are arranged at intervals along the first direction; and / or at least two of the grooves are arranged at intervals along the first direction.

[0010] Optionally, the number of the protrusions is less than or equal to the number of the grooves, and any one of the grooves can be used to engage with any one of the protrusions.

[0011] Optionally, a spacing distance between adjacent protrusions along the first direction is equal to N times a spacing distance between adjacent grooves along the first direction, where N is an integer ≥2.

[0012] Optionally, at least one side wall of the groove is provided with a limiting groove, and the side wall of the protrusion is provided with a limiting protrusion corresponding to the limiting groove to limit the movement of the first connecting member and the second connecting member in a direction perpendicular to the first direction and the second direction.

[0013] Optionally, a first bending portion is provided at the connection between the first connecting portion and the clamping portion; and / or a second bending portion is provided at the connection between the second connecting portion and the matching portion.

[0014] In a second aspect, the utility model provides a battery module, comprising a plurality of battery cells stacked along a first direction, and a bus according to the first aspect of the utility model, wherein one end of a surface of one side of the battery cell along the second direction is connected to the first connector, and the other end is connected to the second connector; the first connector of the battery cell can be engaged and snap-fitted with the second connector of an adjacent battery cell, and the second connector of the battery cell can be engaged and snap-fitted with the first connector of another adjacent battery cell; each of the battery cells is engaged and snap-fitted with an adjacent battery cell along the second direction via the first connector and / or the second connector.

[0015] In the third aspect, the utility model also provides a battery pack, comprising the aforementioned battery modules, at least two of the battery modules are arranged along the second direction, and two adjacent battery modules are provided with two relative first connectors or second connectors along the second direction; and also includes a third connector, which can be respectively engaged with the two relative first connectors or second connectors along the second direction to connect the two adjacent battery modules.

[0016] Compared with the prior art, the beneficial effect provided by the utility model is that the bus is arranged into a first connector and a second connector arranged along a first direction which are disconnected from each other, and the first connector and the second connector can be matched and snap-fitted in the second direction. By installing in two directions, they do not interfere with each other, thereby improving installation convenience and being suitable for different application scenarios. At the same time, the snap-fitting can reduce the impact of welding on other batteries and improve battery safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative work.

[0018] Figure 1 A structural schematic diagram of a busbar clamping process provided by an embodiment of the utility model;

[0019] Figure 2 A schematic diagram of the structure of an un-clamped bus provided in one embodiment of the utility model;

[0020] Figure 3 for Figure 2 A partial enlarged schematic diagram of the middle A area;

[0021] Figure 4 A schematic diagram of the structure of a clamped busbar provided in one embodiment of the utility model;

[0022] Figure 5 A top view of a battery module provided in one embodiment of the utility model;

[0023] Figure 6 Another structural schematic diagram of a clamped busbar provided in an embodiment of the utility model;

[0024] Figure 7 for Figure 6 A partial enlarged schematic diagram of area B in the middle;

[0025] Figure 8 A schematic diagram of a battery pack provided in accordance with an embodiment of the present invention.

[0026] icon:

[0027] 100-bus; 10-first connecting member; 101-first connecting portion; 102-clamping portion; 1021-protrusion; 1022-recess; 1023-limiting protrusion; 103-first bending portion; 20-second connecting member; 201-second connecting portion; 202-matching portion; 2021-groove; 2022-opening; 2023-enclosure; 2024-limiting groove; 203-second bending portion; 30-third connecting member; 300-battery cell; 400-battery module; 500-battery pack. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present utility model, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the utility model product is usually placed when in use, or are directions or positional relationships that are usually understood by those skilled in the art. These directions or positional relationships are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present utility model.

[0032] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" 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 a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The specific implementation of the utility model is described in detail below in conjunction with the accompanying drawings.

[0035] First embodiment

[0036] Please refer to Figure 1-Figure 4 As shown, this embodiment provides a busbar 100, including a first connector 10 and a second connector 20 arranged along a first direction, and the first connector 10 and the second connector 20 are respectively provided with a first connecting portion 101 and a second connecting portion 201 at ends away from each other, and the first connecting portion 101 and the second connecting portion 201 are used to respectively connect two adjacent battery cells 300; one of the ends of the first connector 10 and the second connector 20 close to each other is provided with a clamping portion 102 and the other is provided with a matching portion 202, and the clamping portion 102 and the matching portion 202 are matched and clamped along a second direction perpendicular to the first direction. Reference Figure 1 As shown, the first direction may be direction a, and the second direction may be direction b perpendicular to the first direction.

[0037] Compared with the prior art, the busbars are all integrally formed. In this embodiment, the busbar 100 is configured as a first connector 10 and a second connector 20 that are arranged along the first direction a and are disconnected from each other. The first connector 10 and the second connector 20 can be engaged in a second direction b. The first connector 10 and the second connector 20 can be engaged in a second direction b through the engaging portion 102 and the engaging portion 20. The busbar 100 is welded to two battery cells 300 in the first direction a and engaged with each other in the second direction b without interfering with each other, which is convenient for the installation and maintenance of the busbar 100 and improves the installation convenience of the busbar 100. Even if the first connector 10 and the second connector 20 still need to be welded to the battery cell 300, a single battery cell 300 can be welded separately, and the welding slag can be controlled within a limited range without the need for welding multiple battery cells 300 in groups, thereby avoiding the influence of the welding of adjacent battery cells 300 on the battery cell 300 and reducing the risk of welding slag.

[0038] Optionally, refer to Figure 2-Figure 4 As shown, a protrusion 1021 is convexly provided on one side surface of the clamping portion 102 corresponding to the matching portion 202, and a groove 2021 is concavely provided on one side surface of the matching portion 202 corresponding to the clamping portion 102, and the protrusion 1021 and the groove 2021 extend along the second direction, so that the protrusion 1021 can be inserted into the groove 2021 along the second direction. The protrusion 1021 can be engaged with the groove 2021, thereby realizing the mechanical connection and electrical connection of the first connector 10 and the second connector 20, while preventing the first connector 10 and the second connector 20 from slipping off. The cross section of the protrusion 1021 is the same as the cross section of the groove 2021, which increases the clamping contact area while ensuring the clamping stability, thereby increasing the flow area.

[0039] It should be noted that the protrusion 1021 and the groove 2021 are arranged on two corresponding side surfaces, the clamping portion 102 and the matching portion 202 are arranged relatively to each other, and the clamping portion 102 can be arranged above the matching portion 202, then the protrusion 1021 is arranged on the lower surface of the clamping portion 102, and the groove 2021 is arranged on the upper surface of the matching portion 202; or, the clamping portion 102 can be arranged below the matching portion 202, then the protrusion 1021 is arranged on the upper surface of the clamping portion 102, and the groove 2021 is arranged on the lower surface of the matching portion 202.

[0040] In order to improve the accuracy of the clamping, an opening 2022 is set at one end of the groove 2021 along the second direction, and a barrier 2023 is set at the other end, so that the protrusion 1021 can be inserted into the groove 2021 from the opening 2022 and abut against the barrier 2023; wherein, a recessed portion 1022 for accommodating the barrier 2023 is set at one end of the protrusion 1021 along the second direction. When the protrusion 1021 is inserted into the groove 2021 from the opening 2022, it moves along the second direction until the recessed portion 1022 at the end of the protrusion 1021 abuts against the enclosure 2023, so that the recessed portion 1022 and the enclosure 2023 are interlocked with each other. This not only ensures that the protrusion 1021 and the groove 2021 are plugged into each other to the target position, and prevents the protrusion 1021 from sliding out of the groove 2021 or being misplaced, thereby ensuring the flow area, but also the recessed portion 1022 and the enclosure 2023 contact each other, thereby increasing the flow area, ensuring the structural strength of the bus 100, and facilitating production, thereby preventing the enclosure 2023 from protruding out of the groove 2021 and affecting the overall structural strength. The protrusion of the enclosure 2023 may also increase the difficulty of production.

[0041] Optionally, at least two protrusions 1021 are arranged at intervals along the first direction; and / or at least two grooves 2021 are arranged at intervals along the first direction. Figure 6 and Figure 7 As shown, a plurality of protrusions 1021 can be provided on the clamping portion 102, and a plurality of grooves 2021 can also be provided on the matching portion 202, so that the lengths of the first connector 10 and the second connector 20 along the first direction a can be adjusted to adapt to different application scenarios. For example, the thickness of the battery cells 300 along the first direction a is different, the thickness of the heat insulation structure and the cooling structure provided between adjacent battery cells 300 is different, etc., which can all lead to changes in the clamping position of the first connector 10 and the second connector 20 between two adjacent battery cells 300. The number of protrusions 1021 can be equal to the number of grooves 2021. When a plurality of protrusions 1021 and a plurality of grooves 2021 are matched and clamped one by one, the contact area between the first connector 10 and the second connector 20 can also be increased, the current flow capacity can be improved, and the clamping firmness can be improved. Reference Figure 7As shown, in order to increase the length of the busbar 100 in the first direction a, a protrusion 1021 closest to the matching portion 202 is engaged with a groove 2021 closest to the engaging portion 102 . At this time, the busbar 100 is at its maximum length.

[0042] Specifically, the number of protrusions 1021 is less than or equal to the number of grooves 2021, and any groove 2021 can be used to engage with any protrusion 1021. In order to facilitate the engagement, on the overlapping surface of the first connector 10 and the second connector 20 in the vertical direction, any protrusion 1021 can be engaged with the groove 2021, so as to avoid the protrusion 1021 abutting against the side surface of the matching portion 202 where the groove 2021 is provided, thereby preventing other protrusions 1021 from engaging. Therefore, the number of protrusions 1021 is less than the number of grooves 2021, so as to ensure that there are enough grooves 2021 to accommodate multiple protrusions 1021, thereby improving the diversity of the length adjustment of the busbar 100 in the first direction a. For example, three protrusions 1021 and four grooves 2021 are provided, and all three protrusions 1021 can be snapped into the grooves 2021 , or the two protrusions 1021 closest to the mating portion 202 are snapped into the grooves 2021 , so that the remaining protrusion 1021 is away from the groove 2021 , thereby appropriately extending the length of the bus 100 .

[0043] In order to further improve the length adjustment diversity, the spacing distance between adjacent protrusions 1021 along the first direction is equal to N times the spacing distance between adjacent grooves 2021 along the first direction, where N is an integer ≥ 2. The protrusions 1021 need to cooperate with multiple grooves 2021 to ensure both firm clamping and adjustment diversity, so two adjacent protrusions 1021 can span one groove 2021 and be clamped into two grooves 2021, thereby reducing the adjustment amount. At this time, the spacing between the protrusions 1021 along the first direction is twice the spacing between the grooves 2021 along the first direction, that is, two protrusions 1021 and three grooves 2021 are arranged along the first direction a, and the two protrusions 1021 are respectively clamped with the two grooves 2021 at both ends. In other embodiments, two adjacent protrusions 1021 can span two continuous grooves 2021 and be inserted into the two grooves 2021. At this time, the spacing between the protrusions 1021 along the first direction is 3 times the spacing between the grooves 2021 along the first direction. The spacing distance of the protrusions 1021 and / or the spacing distance of the grooves 2021 can be set as needed to meet different application scenarios.

[0044] In order to improve the firmness of the clamping and limiting, at least one side wall of the groove 2021 is provided with a limiting groove 2024, and the side wall of the protrusion 1021 is provided with a limiting protrusion 1023 corresponding to the limiting groove 2024 to limit the movement of the first connecting member 10 and the second connecting member 20 in a direction perpendicular to the first direction and the second direction. Figure 7As shown, in the height direction, the first connector 10 and the second connector 20 can be limited to move in the height direction by the cooperation of the limiting groove 2024 and the limiting protrusion 1023. Specifically, the limiting groove 2024 can be set on the two opposite side walls of the groove 2021, and the limiting protrusion 1023 can be set on the two opposite side walls of the protrusion 1021. The limiting groove 2024 and the limiting protrusion 1023 have the same cross-section, thereby increasing the contact area and improving the flow capacity. The specific shapes of the limiting groove 2024 and the limiting protrusion 1023 are not specifically limited, as long as they are mutually engaged and matched in the height direction. Specifically, the width of the cross-section of the groove 2021 increases from top to bottom in the height direction, that is, the side wall of the groove 2021 forms an inclined surface, and the inclined surface can form a limiting groove 2024 with the bottom wall of the groove 2021, and the width of the cross-section of the protrusion 1021 increases from top to bottom in the height direction, that is, the side wall of the protrusion 1021 forms an inclined surface, and the inclined surface and the bottom wall of the protrusion 1021 form a limiting protrusion 1023, so that the limiting protrusion 1023 and the limiting groove 2024 can be mutually engaged in the height direction to achieve limiting.

[0045] In order to improve the connection firmness between the first connector 10 and the second connector 20, a first bending portion 103 is provided at the connection between the first connector 101 and the clamping portion 102; and / or, a second bending portion 203 is provided at the connection between the second connector 201 and the matching portion 202. It can be understood that the first bending portion 103 can be provided only on the first connector 10, or the second bending portion 203 can be provided only on the second connector 20, or the first bending portion 103 can be provided on the first connector 10, and the second bending portion 203 can be provided on the second connector 20, which can be configured as needed. The first bending portion 103 and the second bending portion 203 are both bent perpendicular to the first direction and the second direction, so that after the first connector 10 and the second connector 20 are clamped, the distance between the first connector 10 and the second connector 20 can be appropriately adjusted by the first bending portion 103 and the second bending portion 203, so as to avoid the first connector 10 and the second connector 20 slipping due to the force caused by the collision of the battery cell 300.

[0046] Second embodiment

[0047] The present embodiment provides a battery module 400, comprising a plurality of battery cells 300 stacked along a first direction, and the bus in the first embodiment, wherein one end of a side surface of the battery cell 300 along a second direction is connected to a first connector 10, and the other end is connected to a second connector 20; the first connector 10 of the battery cell 300 can be engaged with and snap-fitted to the second connector 20 of an adjacent battery cell 300, and the second connector 20 of the battery cell 300 can be engaged with and snap-fitted to the first connector 10 of another adjacent battery cell 300; each battery cell 300 is engaged with an adjacent battery cell 300 along the second direction via the first connector 10 and / or the second connector 20.

[0048] refer to Figure 1 As shown, the first connector 10 and the second connector 20 are respectively disposed on the same battery cell 300 , and the first connector 10 and the second connector 20 extend in opposite directions in a first direction a, so as to be connected to two adjacent battery cells 300 .

[0049] During production, the first connector 10 and the second connector 20 can be welded to the battery cell 300 respectively, and each battery cell 300 can be welded independently to avoid the influence of welding slag on other battery cells 300, and it is also easy to control the generation of welding slag, reduce the number of foreign matter in the whole, and improve the safety of the battery. After the welding of the battery cell 300 is completed, the first connection part 10 and the second connection part 20 of the two battery cells 300 can be clamped along the second direction b, and clamped in sequence along the first direction a, so as to realize the mutual electrical connection of multiple battery cells 300 to form a battery module 400. During maintenance, the clamped first connector 10 and the second connector 20 can be reversed along the second direction b along the installation direction to disassemble, maintain, and replace one or more battery cells 3, thereby improving the convenience of production and maintenance.

[0050] The battery module 400 in this embodiment realizes electrical connection between two adjacent battery cells 300 through the bus bar 100, reduces the risk of welding slag, avoids the influence of welding slag on other battery cells 300 during welding, and is convenient for installation and disassembly, thereby improving production and maintenance efficiency.

[0051] Third embodiment

[0052] A battery pack 500 is provided, comprising the aforementioned battery modules 400, wherein at least two battery modules are arranged along a second direction b, and two adjacent battery modules are provided with relative first connectors 10 or second connectors 20 along the second direction; and a third connector 30 is also included, wherein the third connector 30 is respectively engaged with two relative first connectors 10 or second connectors 20 along the second direction to connect two adjacent battery modules 400.

[0053] refer to Figure 8 As shown, a corresponding first connector 10 or a second connector 20 is disposed on a relatively close side of two battery modules 400 , and the two corresponding first connectors 10 or the second connectors 20 are connected by a third connector 30 , thereby achieving electrical connection between the two battery modules 400 .

[0054] The third connector 30 can be simultaneously snap-connected with the corresponding first connector 10 or second connector 20 along the second direction b, and its snap-connection structure is similar to the aforementioned bus, with the difference that: the third connector is a U-shaped structure, and its two ends are connected to two identical first connectors 10 or second connectors 20. When the two battery modules 400 are provided with the first connector 10, the third connector 30 includes two interconnected second connectors 20, thereby achieving electrical connection through two pairs of mutually mating first connectors 10 and second connectors 20; when the two battery modules 400 are provided with the second connector 20, the third connector 30 includes two interconnected first connectors 10, thereby achieving electrical connection through two pairs of mutually mating first connectors 10 and second connectors 20.

[0055] Specifically, refer to Figure 8 , the first connector 10 is set at the end of the two battery modules 400, the first connector 10 includes a first connecting portion 101 and a clamping portion 102, the two first connecting portions 101 are respectively connected to the battery cells 300 of the two battery modules 400, and the two first connectors 10 are correspondingly arranged, so that the two clamping portions 102 are arranged correspondingly along the second direction b. At this time, the third connector 30 includes two second connectors 20 arranged along the second direction b in a U-shaped connection, the second connector 20 includes a second connecting portion 201 and a matching portion 202, the two second connectors 20 are connected to each other through a connecting section, and each matching portion 202 is respectively clamped with the clamping portion 102 in the second direction b, so as to realize the electrical connection of the two battery modules 400. Through the third connector 30, the clamping of the two battery modules 400 is realized, and the convenience of production and maintenance is improved. When the two battery modules 400 are provided with corresponding second connectors 20 to realize the connection, at this time, the third connector 30 is provided with two first connectors 10 that match it, which can be configured as needed, and will not be repeated here.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A busbar, characterized in that: include: A first connecting member (10) and a second connecting member (20) are arranged along a first direction, and ends of the first connecting member (10) and the second connecting member (20) that are away from each other are respectively provided with a first connecting portion (101) and a second connecting portion (201), and the first connecting portion (101) and the second connecting portion (201) are used to respectively connect two adjacent battery cells (300); one of the ends of the first connecting member (10) and the second connecting member (20) that are close to each other is provided with a clamping portion (102) and the other is provided with a matching portion (202), and the clamping portion (102) and the matching portion (202) are matched and clamped along a second direction perpendicular to the first direction.

2. The busbar according to claim 1, characterized in that: A protrusion (1021) is convexly provided on a surface of one side of the clamping portion (102) corresponding to the matching portion (202), and a groove (2021) is concavely provided on a surface of one side of the matching portion (202) corresponding to the clamping portion (102), and the protrusion (1021) and the groove (2021) extend along the second direction so that the protrusion (1021) can be inserted into the groove (2021) along the second direction.

3. The busbar according to claim 2, characterized in that: An opening (2022) is provided at one end of the groove (2021) along the second direction, and a barrier (2023) is provided at the other end, so that the protrusion (1021) can be inserted into the groove (2021) from the opening (2022) and abut against the barrier (2023); Wherein, one end of the protrusion (1021) along the second direction is provided with a recessed portion (1022) for accommodating the enclosure (2023).

4. The busbar according to claim 2, characterized in that: At least two of the protrusions (1021) are arranged at intervals along the first direction; And / or, at least two of the grooves (2021) are arranged at intervals along the first direction.

5. The busbar according to claim 4, characterized in that: The number of the protrusions (1021) is less than or equal to the number of the grooves (2021), and any one of the grooves (2021) can be used to engage with any one of the protrusions (1021).

6. The busbar according to claim 4, characterized in that: The spacing distance between adjacent protrusions (1021) along the first direction is equal to N times the spacing distance between adjacent grooves (2021) along the first direction, where N is an integer ≥2.

7. The busbar according to claim 2, characterized in that: At least one side wall of the groove (2021) is provided with a limiting groove (2024), and the side wall of the protrusion (1021) is provided with a limiting protrusion (1023) correspondingly engaged with the limiting groove (2024) to limit the movement of the first connecting member (10) and the second connecting member (20) in a direction perpendicular to the first direction and the second direction.

8. The busbar according to claim 5, characterized in that: A first bending portion (103) is provided at the connection between the first connecting portion (101) and the clamping portion (102); And / or, a second bending portion (203) is provided at the connection between the second connecting portion (201) and the matching portion (202).

9. A battery module, comprising a plurality of battery cells (300) stacked along a first direction, and a busbar according to any one of claims 1 to 8, characterized in that: One end of a surface of one side of the battery cell (300) along the second direction is connected to the first connecting member (10), and the other end is connected to the second connecting member (20); The first connecting member (10) of the battery cell (300) can be engaged with the second connecting member (20) of an adjacent battery cell (300), and the second connecting member (20) of the battery cell (300) can be engaged with the first connecting member (10) of another adjacent battery cell (300); Each of the battery cells (300) is connected to an adjacent battery cell (300) by snap-fitting along the second direction via a first connector (10) and / or a second connector (20).

10. A battery pack, comprising the battery module (400) according to claim 9, characterized in that: At least two of the battery modules are arranged along the second direction, and two adjacent battery modules are provided with two opposite first connectors (10) or second connectors (20) along the second direction; It also includes a third connecting member (30), which can be respectively engaged with two opposite first connecting members (10) or second connecting members (20) along the second direction to connect two adjacent battery modules (400).

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