Battery module, battery pack and vehicle

Abstract

The utility model discloses a battery module, a battery pack and a vehicle. The battery module comprises a battery cell, the battery cell comprises a shell and a roll core located in the shell, the roll core is provided with a tab, the shell is provided with a first wall facing the tab, and the first wall is provided with a first through hole; the pressing rivet column penetrates through the first through hole, the pressing rivet column is provided with a first end located in the shell and a second end exposed out of the first wall, and the first end is electrically connected with the tab; the connecting piece is provided with a connecting part, the surface, facing the battery cell, of the connecting part is attached to the outer surface of the first wall, and the connecting part is electrically connected with the second end. According to the utility model, a pole is omitted, one end of the pressing rivet column is connected with the tab, and the other end of the pressing rivet column penetrates through the shell and then is directly connected with the connecting part attached to the shell, so that the occupied height of the tab in the axial direction of the battery cell is saved, the space utilization rate is improved, the integration efficiency is improved, and meanwhile, the material quantity is reduced; the welding process of the connecting piece and the pole is omitted, and weight reduction and cost reduction are facilitated.

Description

Technical Field

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

[0002] In the prior art, a winding core is provided inside a battery cell. Among them, pressure riveting posts are fixed on the tabs of the winding core. The pressure riveting posts pass through the outer shell, and a pole column is correspondingly connected to the end of the pressure riveting post exposed outside the outer shell. When multiple battery cells are assembled into a battery module, a conductive loop is formed by connecting the pole columns on two adjacent battery cells with a connecting piece. However, this assembly structure of the battery module causes a large height occupation in the axial direction of the battery cell where the pole column is located, low space utilization rate, and high material cost. In addition, the laser welding process is used to connect the pole column and the connecting piece, which also increases the production cost. Summary of the Utility Model

[0003] In view of this, the utility model provides a battery module, a battery pack and a vehicle to solve the above technical problems.

[0004] The battery module provided by the utility model includes:

[0005] A battery cell, the battery cell includes an outer shell and a winding core located inside the outer shell. The winding core has tabs, and the outer shell has a first wall facing the tabs. The first wall is provided with a first through hole;

[0006] A pressure riveting post, the pressure riveting post penetrates through the first through hole. The pressure riveting post has a first end located inside the outer shell and a second end exposed on the first wall. The first end is electrically connected to the tab;

[0007] A connecting piece, the connecting piece has a connecting portion. The surface of the connecting portion facing the battery cell is attached to the outer surface of the first wall. The connecting portion is electrically connected to the second end.

[0008] Optionally, the connecting portion is provided with a second through hole, the second end penetrates into the second through hole, and the side wall of the second end located inside the second through hole is electrically connected to the side wall of the second through hole.

[0009] Optionally, the end face of the second end protrudes from the surface of the second through hole away from the battery cell.

[0010] Optionally, the first wall is provided with a groove, and the connecting portion is arranged in the groove;

[0011] The first through hole is arranged in the groove.

[0012] Optionally, an insulating protective layer is arranged in the groove, and the connecting portion is attached to the insulating protective layer.

[0013] Optionally, the riveting post is in interference connection with the second through hole.

[0014] Optionally, a sealing ring is arranged between the circumferential direction of the connecting portion and the bottom of the groove.

[0015] Optionally, the outer shell includes a top cover and a housing, the top cover and the housing enclose a receiving cavity, and the core is arranged in the receiving cavity.

[0016] Optionally, the number of the battery cells is multiple, and the multiple battery cells form a row of battery cell groups. The connecting piece includes a first connecting piece. Adjacent two battery cells are connected by the first connecting piece. The first connecting piece includes a first bending plate and the connecting portions extending from two free ends of the first bending plate away from each other. The first bending plate protrudes towards the direction away from the first wall.

[0017] Optionally, the number of the battery cells is multiple, and the multiple battery cells form at least two rows of battery cell groups. The connecting piece includes a second connecting piece. At the end of the same end of adjacent two rows of battery cell groups, adjacent two battery cells are connected by the second connecting piece. The second connecting piece includes a second bending plate and the connecting portions extending from two free ends of the second bending plate away from each other. The second bending plate protrudes towards the direction away from the first wall.

[0018] Optionally, the number of the battery cells is multiple, and the multiple battery cells form a row of battery cell groups. The connecting piece includes a third connecting piece. At least one battery cell located at the end of the battery cell group is connected to the third connecting piece. The third connecting piece includes an output row and the connecting portion extending from one end of the output row. The output row protrudes towards the direction away from the first wall.

[0019] Optionally, the included angle between the first bending plate and the connecting portion is 90 - 150°; and / or,

[0020] The connection between the first bending plate and the connecting portion is set to have an arc transition.

[0021] The present utility model further provides a battery pack, including the battery module described in any one of the above.

[0022] The present utility model further provides a vehicle, including the battery pack described above.

[0023] The above technical solutions provided by the present utility model, compared with the prior art, have at least the following beneficial effects:

[0024] By using the battery module, battery pack and vehicle of the present utility model, the pole posts of the battery cells in the battery module are cancelled. One end of the riveting post is connected to the tab, and the other end passes through the housing and is directly connected to the connecting part that fits the housing, saving the height occupied in the axial direction of the battery cell where the tab is located, improving the space utilization rate, enhancing the integration efficiency, reducing the number of materials at the same time, eliminating the welding process of the connecting piece and the pole post, and being beneficial to weight reduction and cost reduction. Description of the Drawings

[0025] Figure 1 The three-dimensional structure diagram of the battery module according to an embodiment of the present utility model;

[0026] Figure 2 is Figure 1 The cross-sectional view of the battery module shown;

[0027] Figure 3 is Figure 1 The schematic diagram of the connecting piece of the battery module shown;

[0028] Figure 4 is Figure 1 The schematic diagram of the battery cell of the battery module shown;

[0029] Figure 5 is Figure 4 The schematic diagram of the connection relationship between the battery cell and the riveting post shown.

[0030] Reference Signs:

[0031] 1: Battery cell; 101: Housing; 102: Top cover; 103: Winding core; 104: Explosion-proof valve; 105: Groove; 106: First through hole; 2: Connecting piece; 20: First bending plate; 201: Horizontal section; 202: Bent section; 203: Connecting part; 204: Second through hole; 3: Riveting post; 4: Insulating protective layer. Detailed Embodiments

[0032] The following further illustrates the detailed embodiments of the present utility model with reference to the drawings.

[0033] It is easy to understand that according to the technical solution of the present utility model, under the condition of not changing the essential spirit of the present utility model, there are various structural ways and implementation ways that can be mutually replaced by those of ordinary skill in the art. Therefore, the following detailed embodiments and drawings are only illustrative descriptions of the technical solution of the present utility model, and should not be regarded as all of the present utility model or as a limitation or restriction on the technical solution of the utility model.

[0034] In this specification, orientation terms such as up, down, left, right, front, back, front side, back side, top, and bottom, which are mentioned or may be mentioned, are defined relative to the structures shown in the respective drawings. They are relative concepts and may therefore change accordingly depending on their different positions and usage states. Therefore, these or other orientation terms should not be construed as restrictive terms.

[0035] Figure 1 Stereoscopic structure diagram of a battery module according to an embodiment of the present utility model; Figure 2 is Figure 1 Cross-sectional view of the shown battery module.

[0036] As Figure 1 and Figure 2 As shown, the battery module includes a battery cell 1, a riveting post 3, and a connecting piece 2. The battery cell 1 includes a housing and a wound core 103 located inside the housing. The wound core 103 has tab ears, and the housing has a first wall facing the tab ears. The first wall is provided with a first through hole 106; the riveting post 3 penetrates through the first through hole 106. The riveting post 3 has a first end located inside the housing and a second end exposed on the first wall. The first end is electrically connected to the tab ear; the connecting piece 2 has a connecting portion 203. The surface of the connecting portion 203 facing the battery cell 1 is attached to the outer surface of the first wall. The connecting portion 203 is electrically connected to the second end.

[0037] During assembly, the wound core 103 is placed inside the housing. The tab ears of the wound core 103 are arranged corresponding to the first wall of the housing. The riveting post 3 is penetrated through the first through hole 106 on the first wall and fixedly connected to the tab ear of the wound core 103. The connecting portion 203 of the connecting piece 2 is arranged corresponding to the riveting post 3 exposed outside the battery cell 1, so that the riveting post 3 is directly connected to the connecting portion 203. At the same time, one side surface of the connecting portion 203 facing the first wall of the housing abuts.

[0038] By adopting the battery module of the present utility model, the pole column is cancelled. One end of the riveting post 3 is connected to the tab ear, and the other end penetrates through the housing and is directly connected to the connecting portion 203 attached to the housing, saving the height occupied in the axial direction of the battery cell 1 where the tab ear is located, improving the space utilization rate, enhancing the integration efficiency, reducing the number of materials at the same time, eliminating the welding process between the connecting piece 2 and the pole column, and being beneficial to weight reduction and cost reduction.

[0039] As Figure 1 and Figure 2As shown, in this embodiment, the battery cell 1 is a square-shell battery cell. Taking the example of three square-shell battery cells arranged in sequence, the positive and negative electrodes of adjacent square-shell battery cells are arranged correspondingly. The top surface of the outer shell of the square-shell battery cell is the first wall, and the center position of the top surface is the explosion-proof valve 104. First through-holes 106 are respectively opened on the opposite two sides symmetrical about the explosion-proof valve 104 corresponding to the positions of the positive electrode tab and the negative electrode tab of the internal winding core 103. Press-fit columns 3 are welded to both the positive electrode tab and the negative electrode tab, and the press-fit columns 3 respectively pass through the first through-holes 106 on the top surface of the outer shell and expose to the outside. The left and right ends of the connecting piece 2 are respectively aligned with two adjacent press-fit columns 3, and the two press-fit columns 3 respectively pass through the connecting portion 203 of the connecting piece 2 and are directly fixedly connected to the connecting portion 203, and the connecting portion 203 is respectively in contact with the top surface of the outer shell of the adjacent square-shell battery cell. If the battery module is arranged in the battery pack in the Figure 1 way that the battery cell 1 stands upright as shown in Figure 1 , the height space of the overall battery pack in the vehicle height direction, that is, the Z direction, is saved; if the battery module is arranged in the battery pack in the Figure 1 way that the battery cell 1 lies horizontally after rotating 90 degrees as shown in Figure 1 , the occupied space of the overall battery pack in the horizontal direction is saved. Specifically, the height occupied in the axial direction of the battery cell 1 where the tabs are located is saved. According to the actual application situation, the battery cell 1 can be a square-shell battery cell or a cylindrical battery cell. When a cylindrical battery cell is selected, the specific structural form of the connecting piece 2 and the connecting portion 203 is adjusted adaptively. The first wall can be the top surface of the battery cell outer shell or the side surface of the outer shell. The number of battery cells 1 included in the battery module can be adjusted as needed. The connecting piece 2 can adopt any structure that can be fixedly connected to the press-fit column 3, can reduce the height occupied in the axial direction of the battery cell 1 where the tabs are located, and can form an electrical conduction path.

[0040] Figure 3 is Figure 1 a schematic diagram of the connecting piece of the battery module shown. As Figures 1-3 shown, optionally, the connecting portion 203 is provided with a second through-hole 204, and the second end of the press-fit column 3 penetrates into the second through-hole 204, and the side wall of the second end located in the second through-hole 204 is electrically connected to the side wall of the second through-hole 204. Presetting the second through-hole 204 facilitates the quick connection between the connecting portion 203 and the press-fit column 3.

[0041] Optionally, the end surface of the second end of the press-fit column 3 protrudes from the surface of the second through-hole 204 away from the battery cell 1. With this setting, the end of the second end of the press-fit column 3 completely penetrates the second through-hole 204, and can contact the inner wall of the second through-hole 204 to the greatest extent, improving the connection stability between the press-fit column 3 and the connecting portion 203.

[0042] As Figure 2As shown, after the riveting post 3 is connected to the connecting portion 203, the top end face of the riveting post 3 penetrates through the connecting portion 203 and is slightly higher than the upper surface of the connecting portion 203.

[0043] Figure 4 For Figure 1 the schematic diagram of the battery cell of the battery module shown. As Figure 1 and Figure 4 shown, optionally, the first wall is provided with a groove 105, the connecting portion 203 is arranged in the groove 105; the first through hole 106 is opened in the groove 105. By means of the groove 105, the installation position of the connecting portion 203 can be made lower, that is, the height of the connecting piece 2 relative to the first wall of the battery cell 1 is reduced, and the space utilization rate can be further improved.

[0044] As Figure 4 shown, in this embodiment, corresponding to the positions of the positive electrode tab and the negative electrode tab of the winding core 103 inside the square shell battery cell, on both sides of the upper surface of the outer shell that are symmetric with respect to the central explosion-proof valve 104, a square groove 105 is respectively opened, and the cross-section of the groove 105 is larger than the cross-section of the connecting portion 203. As Figure 1 shown, the two connecting portions 203 on both sides of the connecting piece 2 are respectively placed in the grooves 105 on the top surfaces of the adjacent two battery cell 1 outer shells. The upper end of the riveting post 3 penetrates through the top surface of the outer shell at the center of the groove 105 and is riveted to the connecting portion 203. According to the actual application situation, the opening position of the groove 105 on the first wall of the outer shell is adjusted according to the positions of the positive electrode tab and the negative electrode tab inside the battery cell, and the depth and the shape and size of the cross-section of the groove 105 are adjusted to match the specification size of the connecting portion 203.

[0045] Figure 5 For Figure 4 the schematic diagram of the connection relationship between the battery cell and the riveting post shown. As Figure 1 and Figure 5 shown, optionally, an insulating protective layer 4 is arranged in the groove 105, and the connecting portion 203 is attached to the insulating protective layer 4. By arranging the insulating protective layer 4, the direct contact between the connecting portion 203 and the inner wall of the groove 105 is isolated, and the leakage of electricity during the conduction process is avoided, thereby preventing safety accidents.

[0046] As Figure 1 and Figure 5 shown, in this embodiment, an insulating protective layer 4 is arranged in each groove 105. The insulating protective layer 4 matches the shape and size of the groove 105. The insulating protective layer 4 covers the inner wall circumference and the bottom of the groove 105. The riveting post 3 penetrates through the first wall where the groove 105 is located and the insulating protective layer 4 at the same time. The connecting portion 203 is connected to the riveting post 3 and is attached to the insulating protective layer 4 at the same time. The shape and size of the insulating protective layer 4 are adjusted to match the change of the groove 105, and its material can be selected from any insulating material, such as rubber, etc.

[0047] Optionally, the riveting post 3 is in interference connection with the second through hole 204. The interference connection is fast and convenient in the connection process, which is beneficial to improving the assembly efficiency.

[0048] As Figure 4 shown, in this embodiment, a circular first through hole 106 is penetratedly opened at the center position of each groove 105 on the first wall of the housing. As Figure 3 shown, a second through hole 204 is correspondingly opened at the center position of each connecting portion 203. The cross-sectional diameter of the riveting post 3 is smaller than that of the first through hole 106 and larger than that of the second through hole 204, so that it can smoothly pass through the housing and be in interference connection with the second through hole 204. The specific opening position of the first through hole 106 in the groove 105 and the specific opening position of the second through hole 204 on the connecting portion 203 are matched and adjusted according to the position change of the riveting post 3.

[0049] Optionally, a sealing ring (not shown) is arranged between the circumferential direction of the connecting portion 203 and the bottom of the groove 105. The arrangement of the sealing ring can prevent the electrolyte in the battery cell 1 from overflowing through the possible gap between the connecting portion 203 and the bottom of the groove 105.

[0050] Optionally, the housing includes a top cover 102 and a housing body 101. The top cover 102 and the housing body 101 enclose an accommodation cavity, and the wound core 103 is arranged in the accommodation cavity. The housing is set as a detachable top cover 102 and housing body 101, which is convenient for taking the wound core 103.

[0051] As Figure 2 shown, the top cover 102 and the housing body 101 enclose a closed accommodation cavity, and the wound core 103 is arranged in the accommodation cavity. As Figure 4 shown, the top cover 102 is the first wall of the housing, the groove 105 is opened on the top cover 102, and the first through hole 106 is opened on the top cover 102.

[0052] Optionally, the number of the battery cells 1 is multiple, and the multiple battery cells 1 form a row of battery cell groups. The connecting piece 2 includes a first connecting piece. Adjacent two battery cells 1 are connected through the first connecting piece. The first connecting piece includes a first bending plate 20 and connecting portions 203 extending from two free ends of the first bending plate 20 away from each other. The first bending plate 20 protrudes in the direction away from the first wall. The connecting piece 2 is set in a structure form with a convex middle part, which can improve its own strength, prevent it from deforming, and further avoid affecting the conductive connection between the battery cells 1.

[0053] As Figures 1-3As shown in the figure, in this embodiment, the first bent plate 20 includes a horizontal section 201 and bent sections 202 extending downward from both ends of the horizontal section 201. Two connecting parts 203 are respectively connected to the free ends of the two bent sections 202 and extend away from each other. Both the horizontal section 201 and the connecting parts 203 are arranged as rectangular flat plates, which are parallel and of equal width. The height of the horizontal section 201 is higher than that of the two connecting parts 203, so that the first bent plate 20 forms a protrusion facing away from the battery cell housing. As Figure 1 shown, multiple square-shell battery cells form a column of battery cell groups. The riveting posts 3 connected to the positive and negative pole tabs between two adjacent square-shell battery cells are directly riveted to the connecting parts 203 of the first connecting piece respectively, and the two connecting parts 203 are respectively in contact with the top covers 102 of two adjacent square-shell battery cells.

[0054] As Figure 2 shown, the range of the thickness H1 of the connecting part 203 is 0.1 mm ≤ H1 ≤ 2 mm; the range of the distance H2 between the surface of the connecting part 203 facing away from the top cover 102 and the surface of the horizontal section 201 facing away from the top cover 102 is 0 < H2 ≤ 3 mm, and H1 + H2 < 4.5 mm. In the prior art, the total thickness of the pole post and the connecting piece 2 is generally at least 4.5 mm. With the above settings, it can not only ensure that the connecting part 203 has sufficient thickness to stably connect with the riveting post 3, but also ensure that the horizontal section 201 bulges upward to improve the self-strength of the connecting piece 2. At the same time, the overall total height of the connecting piece 2 is less than the total thickness of the pole post and the connecting piece 2 in the prior art, reducing the height occupied in the axial direction of the battery cell 1 where the pole tab is located and improving the space utilization rate.

[0055] As Figure 2 shown, the distance H2 between the surface of the connecting part 203 facing away from the top cover 102 and the surface of the horizontal section 201 facing away from the top cover 102, that is, the distance between the upper surface of the connecting part 203 and the upper surface of the horizontal section 201. The specific values of H1 and H2 can be adjusted according to the actual application situation. For example, H1 = 1 mm, H2 = 3 mm, or H1 = 2 mm, H2 = 2 mm, etc.

[0056] Optionally, the number of battery cells 1 is multiple, and multiple battery cells 1 form at least two columns of battery cell groups. The connecting piece 2 includes a second connecting piece. At the end of the same end of two adjacent columns of battery cell groups, two adjacent battery cells 1 are connected through the second connecting piece. The second connecting piece includes a second bent plate and connecting parts 203 extending away from each other from the two free ends of the second bent plate. The second bent plate protrudes in the direction away from the first wall.

[0057] The second connecting piece is used to connect two adjacent battery cells 1 at the same end of two adjacent battery cell groups. Its structural composition is the same as that of the first connecting piece, except that the size of the second bending plate relative to the first bending plate 20 changes, and the specific size of the connecting portion 203 may also change. Its specific structure will not be elaborated here.

[0058] Optionally, the number of battery cells is multiple, and the multiple battery cells form a column of battery cell groups. The connecting piece 2 includes a third connecting piece, and at least one battery cell 1 at the end of the battery cell group is connected to the third connecting piece. The third connecting piece includes an output row and a connecting portion 203 extending from one end of the output row, and the output row protrudes in the direction away from the first wall.

[0059] When the battery cell 1 at the end of the battery cell group needs to be connected to an external component, the third connecting piece is selected. For example, Figure 2 as shown, the leftmost battery cell 1 is located at one end of its corresponding battery cell group. The connecting piece connecting the leftmost battery cell 1 is the third connecting piece. The right end of the output row of the third connecting piece is connected to the connecting portion 203, and the connecting portion 203 is connected to the riveting post 3 connecting the pole ear of the battery cell 1. The left end of the output row is not provided with the connecting portion 203, and the left end of the output row can extend out of the battery pack and be electrically connected to an external component.

[0060] Optionally, the included angle between the first bending plate 20 and the connecting portion 203 is 90° - 150°. Through experiments, when the included angle between the first bending plate 20 and the connecting portion 203 is set within this angle range, it can not only ensure that the overall height of the connecting piece 2 is smaller, saving the layout height, but also make the overall structural strength of the connecting piece 2 stronger and less prone to deformation.

[0061] When the included angle between the first bending plate 20 and the connecting portion 203 is relatively large, such as 150°, it can ensure that after they are connected, the protruding height of the first bending plate 20 is smaller, that is, the overall height of the connecting piece 2 is smaller. When the included angle between the first bending plate 20 and the connecting portion 203 is relatively small, such as 90°, it can ensure the connection strength and anti-deformation performance between them. For example, Figures 1-3 as shown, in this embodiment, the included angle between the bending section 202 of the first bending plate 20 and the connecting portion 203 is approximately 90°. According to the actual application situation, considering the comprehensive space utilization and the connection strength between the two, the included angle between them can also be set to other angles within the above range, such as 100°, 120°, etc.

[0062] Optionally, the connection between the first bending plate 20 and the connecting portion 203 is set with an arc transition, and the arc radius is 0.5 mm - 2 mm. Through experiments, this kind of setting can not only prevent stress concentration and avoid fracture at the connection between the two by means of the arc transition between the first bending plate 20 and the connecting portion 203, but also ensure the connection stability between the turning plate 202 and the connecting portion 203.

[0063] When the arc radius at the connection between the bending plate 20 and the connecting portion 203 is relatively large, such as 2 mm, stress concentration at the connection can be fully prevented, making the force distribution uniform. When the arc radius at the connection between the bending plate 20 and the connecting portion 203 is relatively small, such as 0.5 mm, the connection strength and stability between the two can be ensured. According to the actual application situation, the arc radius at the connection between the bending plate 20 and the connecting portion 203 can be adjusted appropriately, such as setting the arc radius to 1.5 mm, 1 mm, etc.

[0064] The present utility model also provides a battery pack, including the battery module described in any of the above embodiments.

[0065] With the battery pack of the present utility model, the pole column of the battery module therein is cancelled. One end of the riveting post 3 is connected to the tab, and the other end penetrates through the outer shell and is directly connected to the connecting portion 203 attached to the outer shell, saving the height occupied in the axial direction of the battery cell 1 where the tab is located, improving the space utilization rate, enhancing the integration efficiency, reducing the number of materials at the same time, eliminating the welding process between the connecting piece 2 and the pole column, and being beneficial to weight reduction and cost reduction.

[0066] The present utility model also provides a vehicle, including the battery pack described above.

[0067] With the vehicle of the present utility model, the pole column of the battery module therein is cancelled. One end of the riveting post 3 is connected to the tab, and the other end penetrates through the outer shell and is directly connected to the connecting portion 203 attached to the outer shell, saving the height occupied in the axial direction of the battery cell 1 where the tab is located, improving the space utilization rate, enhancing the integration efficiency, reducing the number of materials at the same time, eliminating the welding process between the connecting piece 2 and the pole column, and being beneficial to weight reduction and cost reduction.

[0068] According to needs, the above technical solutions can be combined to achieve the best technical effect.

[0069] The above are only the principles and preferred embodiments of the present utility model. It should be pointed out that for those of ordinary skill in the art, based on the principle of the present utility model, several other modifications can also be made, which should also be regarded as the protection scope of the present utility model.

Claims

1. A battery module, characterized in that, Comprising: A battery cell, the battery cell including a housing and a wound core located within the housing, the wound core having a tab, the housing having a first wall facing the tab, and the first wall being provided with a first through hole; A riveting post, the riveting post passing through the first through hole, the riveting post having a first end located inside the housing and a second end exposed on the first wall, the first end being electrically connected to the tab; A connecting piece, the connecting piece having a connecting portion, a surface of the connecting portion facing the battery cell being attached to an outer surface of the first wall, and the connecting portion being electrically connected to the second end.

2. The battery module according to claim 1, wherein: The connecting portion is provided with a second through hole, the second end penetrates into the second through hole, and a side wall of the second end located within the second through hole is electrically connected to a side wall of the second through hole.

3. The battery module according to claim 2, wherein: An end face of the second end protrudes from a surface of the second through hole away from the battery cell.

4. The battery module according to any one of claims 1-3, wherein: The first wall is provided with a groove, and the connecting portion is disposed within the groove; The first through hole is opened within the groove.

5. The battery module according to claim 4, wherein: An insulating protective layer is disposed within the groove, and the connecting portion is attached to the insulating protective layer.

6. The battery module according to claim 2 or 3, wherein: The riveting post is in interference fit with the second through hole.

7. The battery module according to claim 4, wherein: A sealing ring is disposed between a circumference of the connecting portion and a bottom of the groove.

8. The battery module according to any one of claims 1-3, wherein: The housing includes a top cover and a housing body, the top cover and the housing body enclose a receiving cavity, and the wound core is disposed within the receiving cavity.

9. The battery module according to claim 1, wherein: The number of the battery cells is multiple, and the multiple battery cells form a row of battery cell groups. The connecting piece includes a first connecting piece. Adjacent two of the battery cells are connected by the first connecting piece. The first connecting piece includes a first bending plate and the connecting portions extending from two free ends of the first bending plate away from each other. The first bending plate protrudes in a direction away from the first wall.

10. The battery module according to claim 1, wherein: The number of the battery cells is multiple, and the multiple battery cells form at least two rows of battery cell groups. The connecting piece includes a second connecting piece. At an end of the same end of adjacent two rows of the battery cell groups, adjacent two of the battery cells are connected by the second connecting piece. The second connecting piece includes a second bending plate and the connecting portions extending from two free ends of the second bending plate away from each other. The second bending plate protrudes in a direction away from the first wall.

11. The battery module according to claim 1, wherein: The number of the battery cells is multiple, and the multiple battery cells form a row of battery cell groups. The connecting piece includes a third connecting piece, and at least one battery cell located at the end of the battery cell group is connected to the third connecting piece. The third connecting piece includes an output row and the connecting part extending from one end of the output row, and the output row protrudes in a direction away from the first wall.

12. The battery module according to claim 9, wherein: The included angle between the first bending plate and the connecting part is 90-150°; and / or, The connection between the first bending plate and the connecting part is set to have an arc transition.

13. A battery pack, characterized in that, It includes the battery module according to any one of claims 1-12.

14. A vehicle, characterized in that, It includes the battery pack according to claim 13.

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