Battery module and battery pack

Abstract

The embodiment of the utility model relates to a battery module and a battery pack. Wherein the battery module comprises a battery cell group and a busbar, the battery cell group comprises at least a first battery cell and a second battery cell, and the first battery cell and the second battery cell are respectively provided with a first pole and a second pole; the busbar is provided with a first connecting part, a second connecting part and a buffer part, the first connecting part is connected to the first pole of the first battery cell, and the second connecting part is connected to the second pole of the second battery cell; when the first battery cell and / or the second battery cell are / is expanded, the buffer part is used for buffering the bending deformation of the first connecting part and the second connecting part. The buffer part of the battery module provided by the embodiment of the utility model can buffer bending deformation generated when the first battery cell and / or the second battery cell expand, so that the risk of fracture deformation of the busbar is greatly reduced, and the stability of the battery module is further ensured.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a battery module and a battery pack. Background Art

[0002] In a battery pack, a busbar is commonly used as a high-voltage connector for a battery module, and the high-voltage connector is used to connect two adjacent battery cells.

[0003] When the battery cells expand, the busbar will also bend and deform, and even break, which will have a greater impact on the battery module.

[0004] Therefore, there is an urgent need to provide a battery module to solve at least one of the above technical problems. Summary of the Utility Model

[0005] In view of this, embodiments of the present application provide a battery module and a battery pack to solve at least one problem in the background art.

[0006] In a first aspect, embodiments of the present application provide a battery module, which includes:

[0007] A battery cell group, which includes at least a first battery cell and a second battery cell, and both the first battery cell and the second battery cell have a first pole and a second pole;

[0008] A busbar, which is provided with a first connection part, a second connection part, and a buffer part. The buffer part is connected between the first connection part and the second connection part. The first connection part is connected to the first pole of the first battery cell, and the second connection part is connected to the second pole of the second battery cell;

[0009] When the first battery cell and / or the second battery cell expands, the buffer part is used to buffer the bending deformation of the first connection part and the second connection part.

[0010] In combination with the first aspect of the present application, in an optional embodiment, the buffer part is recessed towards the battery cell group relative to the first connection part and the second connection part, and the buffer part corresponds to the gap between the first battery cell and the second battery cell.

[0011] In combination with the first aspect of the present application, in an optional embodiment, the busbar is further provided with an avoidance notch, and the avoidance notch is used to avoid the mounting point of the box body.

[0012] In combination with the first aspect of the present application, in an optional embodiment, the first connection part, the second connection part, and the buffer part form a U-shaped structure, and the avoidance notch is the opening of the U-shaped structure.

[0013] In connection with the first aspect of the present application, in an alternative embodiment, the battery module further includes:

[0014] A wire harness separator plate, which is provided with at least a first through hole and a second through hole. The first through hole is adapted to the first pole and the second pole, and the second through hole is used to avoid the mounting point of the box body.

[0015] In connection with the first aspect of the present application, in an alternative embodiment, the wire harness separator plate is further provided with rivet posts;

[0016] Both the first connecting portion and the second connecting portion are provided with third through holes, and the third through holes are adapted to the rivet posts so that both the first connecting portion and the second connecting portion are connected to the wire harness separator plate.

[0017] In connection with the first aspect of the present application, in an alternative embodiment, a first accommodating groove, a second accommodating groove and a third accommodating groove are provided on a side of the wire harness separator plate away from the battery cell group, and the first accommodating groove, the second accommodating groove and the third accommodating groove are respectively adapted to the first connecting portion, the second connecting portion and the buffer portion.

[0018] In connection with the first aspect of the present application, in an alternative embodiment, the wire harness separator plate has isolation ribs, and the isolation ribs are located between adjacent busbars.

[0019] In connection with the first aspect of the present application, in an alternative embodiment, an insulating layer is provided on the surface of the busbar.

[0020] In a second aspect, an embodiment of the present application provides a battery pack, including the battery module according to any one of the first aspect.

[0021] In the battery module provided by the embodiment of the present application, by providing a buffer portion on the busbar, the buffer portion can buffer the bending deformation generated when the first battery cell and / or the second battery cell expands, greatly reducing the risk of the busbar breaking and deforming, and further ensuring the stability of the battery module.

[0022] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The illustrative embodiments and descriptions thereof of the present application are used to explain the present application, and do not constitute an improper limitation of the present application. In the drawings:

[0024] Figure 1 It is a schematic diagram of the positional relationship between the battery module provided by the embodiment of the present application and the mounting point of the box body;

[0025] Figure 2 Exploded view of the busbar, first battery cell, and second battery cell in a battery module provided by an embodiment of the present application;

[0026] Figure 3 Schematic diagram of the structure of the busbar, first battery cell, and second battery cell in a battery module provided by another embodiment of the present application;

[0027] Figure 4 Schematic perspective view of the busbar in a battery module provided by an embodiment of the present application;

[0028] Figure 5 Partial schematic diagram of the structure of a battery module provided by an embodiment of the present application;

[0029] Figure 6 Partial schematic diagram of the wiring harness separator in a battery module provided by an embodiment of the present application.

[0030] Reference numerals:

[0031] 10, battery cell group; 11, first battery cell; 12, second battery cell; 1a, first pole; 1b, second pole;

[0032] 20, busbar; 210, first connection part; 220, second connection part; 230, buffer part; 240, avoidance notch; 250, third through hole;

[0033] 30, wiring harness separator; 310, first through hole; 320, second through hole; 330, rivet post; 340, first accommodation groove; 350, second accommodation groove; 360, third accommodation groove; 370, isolation rib;

[0034] 40, box body; 410, mounting point. Detailed implementation manners

[0035] To make the technical solutions and beneficial effects of the present invention more obvious and understandable, the following will be described in detail by way of specific embodiments. Among them, the drawings are not necessarily drawn to scale, and local features can be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which the present application belongs.

[0036] In the description of the present invention, the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of simplifying the description of the present invention, rather than indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, that is, it cannot be understood as a limitation to the present invention.

[0037] In the present invention, the terms "first" and "second" are only used for the purpose of clear description, and cannot be understood as the relative importance of the indicated features or the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may clearly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc.; the meaning of "several" is at least one, such as one, two, three, etc.; unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly defined, terms such as "installed", "connected", "joined", "fixed", "set", etc. shall be understood in a broad sense. For example, "connected" may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may also be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly defined, the first feature being "on", "above", "over" or "upon" the second feature, or "under", "beneath", "below" or "underneath" the second feature may be that the first feature is in direct contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" or "upon" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. The first feature being "under", "beneath", "below" or "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0040] Such as Figures 1 to 3As shown in the figure, an embodiment of the present application provides a battery module. The battery module includes a battery cell group 10 and a bus bar 20. The battery cell group 10 includes at least a first battery cell 11 and a second battery cell 12. Both the first battery cell 11 and the second battery cell 12 have a first pole 1a and a second pole 1b. The bus bar 20 is provided with a first connection portion 210, a second connection portion 220 and a buffer portion 230. The buffer portion 230 is connected between the first connection portion 210 and the second connection portion 220. The first connection portion 210 is connected to the first pole 1a of the first battery cell 11, and the second connection portion 220 is connected to the second pole 1b of the second battery cell 12. When the first battery cell 11 and / or the second battery cell 12 expands, the buffer portion 230 is used to buffer the bending deformation of the first connection portion 210 and the second connection portion 220.

[0041] For the above battery module, the buffer portion 230 can buffer the bending deformation generated by the expansion of at least the first battery cell 11 and the second battery cell 12 in the first direction, i.e., the direction of the arrow s1 shown in Figure 1 Thereby greatly reducing the occurrence of fracture and deformation of the bus bar 20 and further improving the stability of the battery module.

[0042] Preferably, the first connection portion 210 is connected to the first pole 1a of the first battery cell 11 by welding, and the second connection portion 220 is also connected to the second pole 1b of the second battery cell 12 by welding. Of course, the connection methods between the first connection portion 210 and the first pole 1a, and between the second connection portion 220 and the second pole 1b are not limited to welding.

[0043] In an alternative embodiment, as shown in Figure 1 the buffer portion 230 is recessed towards the battery cell group 10 relative to the first connection portion 210 and the second connection portion 220, and the buffer portion 230 corresponds to the gap between the first battery cell 11 and the second battery cell 12.

[0044] When the battery cells generate bending deformation due to expansion, the buffer portion 230 can deform towards the gap between adjacent battery cells to buffer the first connection portion 210 and the second connection portion 220.

[0045] Referring to Figure 2 and Figure 3 , the size of the buffer portion 230 can be set according to the gap between adjacent battery cells. The larger the gap, the larger the buffer portion 230, and the smaller the gap, the smaller the buffer portion 230.

[0046] The conventional bus bar 20 has a square structure. When there is a middle mounting point 410 of the cross beam of the battery pack box 40 or other obstacles in the arrangement direction of the bus bar 20, especially when the volume of the obstacle is large, it usually causes trouble to the arrangement of the bus bar 20.

[0047] Based on this, in the embodiment of the present application, an avoidance notch 240 is provided on the bus bar 20, and the avoidance notch 240 is used to avoid the mounting point 410 of the box body 40 or other obstacles.

[0048] Further, as Figure 2 and Figure 4 shown, the first connecting portion 210, the second connecting portion 220 and the buffer portion 230 form a U-shaped structure, and the avoidance notch 240 is the opening of the U-shaped structure. The size of the notch is set based on the size of the mounting point 410 to avoid interference between the bus bar 20 and the mounting point 410.

[0049] The surface of the bus bar 20 is sprayed with an insulating layer to increase the insulation protection between the bus bar 20 and the mounting point 410.

[0050] In an alternative embodiment, as Figure 5 and Figure 6 shown, the battery module further includes a wire harness isolation plate 30. The wire harness isolation plate 30 is provided with at least a first through hole 310 and a second through hole 320. The first through hole 310 matches the first pole 1a and the second pole 1b, and the second through hole 320 is used to avoid the mounting point 410 of the box body 40.

[0051] The first poles 1a and the second poles 1b of the first battery cell 11 and the second battery cell 12 both protrude from the surfaces of the first battery cell 11 and the second battery cell 12. The first through hole 310 provided on the wire harness isolation plate 30 matches the first pole 1a and the second pole 1b, and can define the position of the wire harness isolation plate 30 relative to the first battery cell 11 and the second battery cell 12.

[0052] Further, the wire harness isolation plate 30 is further provided with rivet posts 330. The first connecting portion 210 and the second connecting portion 220 are both provided with third through holes 250. The third through holes 250 match the rivet posts 330, so that the first connecting portion 210 and the second connecting portion 220 are both connected to the wire harness isolation plate 30.

[0053] It can be understood that the relative positions of the wire harness isolation plate 30 and the first battery cell 11 and the second battery cell 12 are initially defined by the matching of the first through hole 310 with the first pole 1a and the second pole 1b, and then the relative positions of the wire harness isolation plate 30 and the first battery cell 11 and the second battery cell 12 are further defined by the matching of the rivet posts 330 with the third through holes 250.

[0054] In an alternative embodiment, as Figure 6 shown, on the side of the wire harness isolation plate 30 away from the battery cell group 10, a first accommodation groove 340, a second accommodation groove 350 and a third accommodation groove 360 are provided. The first accommodation groove 340, the second accommodation groove 350 and the third accommodation groove 360 respectively match the first connecting portion 210, the second connecting portion 220 and the buffer portion 230.

[0055] Further, the third receiving groove 360 for receiving the buffer portion 230 is recessed relative to the first receiving groove 340 and the second receiving groove 350, and the recess faces the direction of the battery cell, that is, the gap between adjacent battery cells.

[0056] Further, the wire harness separator 30 has separation ribs 370, and the separation ribs 370 are located between adjacent busbars 20. The separation ribs 370 are used to enhance the insulation protection effect between adjacent busbars 20.

[0057] The embodiment of the present application further provides a battery pack, including the battery module provided in any of the above embodiments. The buffer portion 230 provided on the busbar 20 of the battery module can buffer the bending deformation caused by the expansion of the battery cell, greatly reducing the occurrence of fracture and deformation of the busbar 20, ensuring the stability of the battery module, and further improving the stability of the battery pack.

[0058] It should be understood that the above embodiments are all exemplary and do not cover all possible implementation manners included in the claims. Without departing from the scope of the present disclosure, various deformations and changes can be made on the basis of the above embodiments. Similarly, any combination of the technical features of the above embodiments can be made to form other embodiments of the present application that may not be explicitly described. Therefore, the above embodiments only represent several implementation manners of the present application and do not limit the protection scope of the patent of the present application.

Claims

1. A battery module, characterized in that, Comprising: A battery cell group (10), which includes at least a first battery cell (11) and a second battery cell (12), and both the first battery cell (11) and the second battery cell (12) have a first pole (1a) and a second pole (1b); A bus bar (20), which is provided with a first connection part (210), a second connection part (220) and a buffer part (230), the buffer part (230) is connected between the first connection part (210) and the second connection part (220), the first connection part (210) is connected to the first pole (1a) of the first battery cell (11), and the second connection part (220) is connected to the second pole (1b) of the second battery cell (12); When the first battery cell (11) and / or the second battery cell (12) expands, the buffer part (230) is used to buffer the bending deformation of the first connection part (210) and the second connection part (220).

2. The battery module according to claim 1, wherein The buffer part (230) is recessed towards the battery cell group (10) relative to the first connection part (210) and the second connection part (220), and the buffer part (230) corresponds to the gap between the first battery cell (11) and the second battery cell (12).

3. The battery module according to claim 1, wherein The bus bar (20) is further provided with an avoidance notch (240), and the avoidance notch (240) is used to avoid the mounting point (410) of the box body (40).

4. The battery module according to claim 3, characterized in that, The first connection part (210), the second connection part (220) and the buffer part (230) form a U-shaped structure, and the avoidance notch (240) is the opening of the U-shaped structure.

5. The battery module according to claim 1 or 2, characterized in that, Further comprising: A wire harness isolation board (30), which is at least provided with a first through hole (310) and a second through hole (320), the first through hole (310) matches the first pole (1a) and the second pole (1b), and the second through hole (320) is used to avoid the mounting point (410) of the box body (40).

6. The battery module according to claim 5, wherein, The wire harness isolation board (30) is further provided with rivet posts (330); Both the first connection part (210) and the second connection part (220) are provided with third through holes, and the third through holes match the rivet posts (330) so that both the first connection part (210) and the second connection part (220) are connected to the wire harness isolation board (30).

7. The battery module according to claim 5, wherein On the side of the wire harness isolation board (30) away from the battery cell group (10), there are a first accommodation groove (340), a second accommodation groove (350) and a third accommodation groove (360), and the first accommodation groove (340), the second accommodation groove (350) and the third accommodation groove (360) respectively match the first connection part (210), the second connection part (220) and the buffer part (230).

8. The battery module according to claim 5, wherein, The wire harness isolation board (30) has isolation ribs (370), and the isolation ribs (370) are located between adjacent bus bars (20).

9. The battery module according to claim 1, wherein The surface of the bus bar (20) is provided with an insulating layer.

10. A battery pack, characterized in that, Including the battery module according to any one of claims 1 to 9.

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