Battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell and a battery pack. The battery cell comprises a cover plate assembly, a pole group and a pole. The cover plate assembly comprises a cover plate body and a riveting piece, the cover plate body is provided with a mounting hole, the riveting piece is arranged in the mounting hole and riveted with the cover plate body, and the riveting piece is provided with a groove with an opening facing one side of the cover plate body; the pole group is provided with a pole lug; the pole comprises a pole bottom plate and a pole boss, the pole bottom plate extends along the radial direction of the mounting hole, the pole boss is arranged on the pole bottom plate and extends along the axial direction of the mounting hole, the pole bottom plate is welded with the pole lug, the pole boss is inserted into the groove of the riveting piece, and the pole boss is welded with the riveting piece. The number of parts can be reduced, assembly procedures are reduced, and the assembly process is simplified. As the riveting piece is provided with the groove, the pole lug boss can be inserted into the riveting piece, so that quick assembly is realized, and the cost of the battery cell is reduced. And meanwhile, the structure can effectively save space and is beneficial to improving the capacity of the battery cell.

Description

Technical Field

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

[0002] At present, square batteries are widely used for their high packaging reliability, high system energy efficiency, relatively light weight, high energy density and other advantages.

[0003] The main components of a square battery include a cover plate, a housing, an insulating member, and a pole group composed of a positive plate, a negative plate, and a separator. The cover plate is provided with a pole post, which is welded to the pole tab of the pole group through a connecting piece to export electric energy.

[0004] In the related art, the pole tabs of the cover plate and the pole post mostly rely on connecting pieces for connection, and the pole post on the cover plate and the riveting block adopt a fixed connection method of first riveting and then welding. There are many parts, complex assembly, and many processes, resulting in high costs. Summary of the Utility Model

[0005] In view of this, the utility model provides a battery cell and a battery pack to solve the problems of more parts, complex assembly or more processes existing in the battery cell.

[0006] In a first aspect, the utility model provides a battery cell, which includes a cover plate assembly, a pole group, and a pole post. The cover plate assembly includes a cover plate body and a riveting member. The cover plate body is provided with an installation hole. The riveting member is arranged in the installation hole and riveted to the cover plate body. The riveting member has a groove with an opening facing one side of the cover plate body. The pole group is provided with a pole tab. The pole post includes a pole post bottom plate extending along the radial direction of the installation hole and a pole post boss arranged on the pole post bottom plate and extending along the axial direction of the installation hole. The pole post bottom plate is welded to the pole tab, the pole post boss is inserted into the groove of the riveting member, and the pole post boss and the riveting member are welded.

[0007] Beneficial Effects: For the battery cell provided by the utility model, since the pole post is provided with a pole post bottom plate and a pole post boss, the pole post bottom plate is welded to the pole tab, and the pole post boss is welded to the riveting member to export electric energy. The battery cell of the utility model combines the two structures of the traditional pole post and the connecting piece into one, which can reduce the number of parts, reduce the assembly process, and simplify the assembly process. Since the riveting member is provided with a groove, the pole post boss can be inserted into the riveting member to achieve rapid assembly, which is beneficial to reducing the cost of the battery cell. At the same time, such a structure can effectively save space and is beneficial to increasing the capacity of the battery cell.

[0008] In an optional embodiment, the riveting member includes a first riveting portion extending along the radial direction of the installation hole and a second riveting portion arranged on the first riveting portion and extending along the axial direction of the installation hole. The first riveting portion is arranged on the outer surface of the cover plate body, the second riveting portion is arranged in the installation hole, the groove is arranged in the second riveting portion, and a third riveting portion extending along the radial direction of the installation hole is formed around the groove. The third riveting portion is arranged on the inner surface of the cover plate body.

[0009] In an alternative embodiment, the bottom wall of the groove constitutes a first welding portion, and a second welding portion is formed on the top of the pole post boss. The first welding portion and the second welding portion are welded to form a first welding mark.

[0010] In an alternative embodiment, the thickness of the second welding portion is greater than or equal to the thickness of the first welding portion.

[0011] In an alternative embodiment, a counterbore is provided on the outer surface of the first riveting portion at a position corresponding to the groove.

[0012] In an alternative embodiment, a first guiding portion is provided between the first welding portion and the second riveting portion, and a second guiding portion is provided between the second welding portion and the pole post boss. The first guiding portion and the second guiding portion cooperate to guide the insertion of the pole post boss and the groove.

[0013] In an alternative embodiment, the pole post bottom plate and the pole post boss are integrally formed.

[0014] In an alternative embodiment, the pole post bottom plate includes a first connecting portion and a second connecting portion. The pole post boss is provided on the first connecting portion; the tab is bent radially along the mounting hole from its root and then welded to the second connecting portion.

[0015] In an alternative embodiment, an insulating member and a sealing member are further included. The insulating member is provided between the first riveting portion and the upper surface of the cover plate body; the sealing member includes a first sealing portion and a second sealing portion. The first sealing portion is provided between the second riveting portion and the inner wall of the mounting hole, and the second sealing portion is provided between the second riveting portion and the inner surface of the cover plate body.

[0016] In a second aspect, the present invention further provides a battery pack, including the battery cells according to any one of the above technical solutions.

[0017] Beneficial effects: Since the battery pack includes battery cells, it has the same effects as the battery cells, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of a cover plate assembly of a battery cell according to an embodiment of the present invention;

[0020] Figure 2is Figure 1 Top view of

[0021] Figure 3 is Figure 1 Cross-sectional view taken along A-A in

[0022] Figure 4 is Figure 3 Partial enlarged view at B in

[0023] Figure 5 Schematic structural view of the pole column of a battery cell according to an embodiment of the present utility model;

[0024] Figure 6 is Figure 5 Top view of

[0025] Figure 7 is taken along Figure 6 Cross-sectional view taken along C-C in

[0026] Figure 8 Schematic structural view of the connection between the pole column and the tab of the pole group of a battery cell according to an embodiment of the present utility model;

[0027] Figure 9 is Figure 8 Top view of

[0028] Figure 10 is taken along Figure 9 Cross-sectional view taken along D-D in

[0029] Figure 11 is Figure 10 Partial enlarged view at E in

[0030] Figure 12 Schematic structural view of a battery cell according to an embodiment of the present utility model;

[0031] Figure 13 is Figure 12 Top view of

[0032] Figure 14 is taken along Figure 13 Cross-sectional view taken along F-F in

[0033] Figure 15 is Figure 14 Partial enlarged view at G in

[0034] Explanation of reference numerals:

[0035] 1. Cover body; 2. Riveting part; 201. Groove; 202. First riveting part; 203. Second riveting part; 204. First welding part; 205. Counterbore; 206. Third riveting part; 207. First guiding part; 3. Electrode group; 301. Tab; 4. Terminal; 401. Terminal base plate; 4011. First connecting part; 4012. Second connecting part; 402. Terminal boss; 403. Second welding part; 404. Second guiding part; 5. First welding mark; 6. Insulating part; 7. Sealing part; 8. Housing; 10. Battery cell. Detailed implementation manners

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0037] The following combines Figures 1 to 15 , to describe the embodiments of the present utility model.

[0038] According to an embodiment of the present utility model, on the one hand, a battery cell 10 is provided, which includes a cover assembly, an electrode group 3, and a terminal 4. The cover assembly includes a cover body 1 and a riveting part 2. The cover body 1 is provided with a mounting hole. The riveting part 2 is arranged in the mounting hole and riveted to the cover body 1. The riveting part 2 has a groove 201 with an opening facing one side of the cover body 1. The electrode group 3 is provided with a tab 301. The terminal 4 includes a terminal base plate 401 extending radially along the mounting hole and a terminal boss 402 arranged on the terminal base plate 401 and extending axially along the mounting hole. The terminal base plate 401 and the tab 301 are welded. The terminal boss 402 is inserted into the groove 201 of the riveting part 2, and the terminal boss 402 and the riveting part 2 are welded.

[0039] For the battery cell 10 provided by the embodiment of the present utility model, since the terminal 4 is provided with a terminal base plate 401 and a terminal boss 402, the terminal base plate 401 and the tab 301 are welded, and the terminal boss 402 and the riveting part 2 are welded to conduct electric energy. The battery cell 10 in this embodiment combines the two structures of the traditional terminal and connecting piece into one, which can reduce the number of parts, reduce the assembly process, and simplify the assembly process. Since the riveting part 2 is provided with a groove 201, the terminal boss 402 can be inserted into the riveting part 2 to achieve rapid assembly, which is beneficial to reducing the cost of the battery cell 10. At the same time, such a structure can effectively save space, which is beneficial to increasing the capacity of the battery cell 10.

[0040] In some embodiments, the riveting member 2 includes a first riveting portion 202 extending radially along the mounting hole and a second riveting portion 203 provided on the first riveting portion 202 and extending axially along the mounting hole. The first riveting portion 202 is provided on the outer surface of the cover body 1, the second riveting portion 203 is provided in the mounting hole, the groove 201 is provided in the second riveting portion 203, and a third riveting portion 206 extending radially along the mounting hole is formed around the groove 201. The third riveting portion 206 is provided on the inner surface of the cover body 1.

[0041] Specifically, referring to Figure 3 and Figure 4 , the first riveting portion 202 and the third riveting portion 206 of the riveting member 2 rivet the entire riveting member 2 to the outer surface and the inner surface of the cover body 1. The pole stud boss 402 of the pole stud 4 is inserted into the groove 201 of the riveting member 2, and the pole stud 4 and the cover body 1 are connected through the riveting member 2. The structure is simple and the assembly process is less. The outer surface of the cover body 1 refers to the side away from the inner cavity of the housing 8 when the cover body 1 is assembled on the housing 8 of the battery cell 10. Correspondingly, the side facing the inner cavity of the housing 8 is the inner surface of the cover body 1, and the inner side of the cover body 1 refers to the side facing the inner cavity of the housing 8.

[0042] In some embodiments, the bottom wall of the groove 201 constitutes a first welding portion 204, and a second welding portion 403 is formed on the top of the pole stud boss 402. The first welding portion 204 and the second welding portion 403 are welded to form a first weld mark 5.

[0043] When the pole stud boss 402 is inserted into the groove 201, the second welding portion 403 on the top of the pole stud boss 402 abuts against the bottom wall of the groove 201, that is, the first welding portion 204, and the laser penetrates through the first welding portion 204 and the second welding portion 403, and the two are melted and connected to achieve the purpose of electrical connection. The formed first weld mark 5 is as Figure 15 shown.

[0044] In some embodiments, the thickness of the second welding portion 403 is greater than or equal to the thickness of the first welding portion 204.

[0045] Since the thickness of the second welding portion 403 is greater than the thickness of the first welding portion 204, in this way, when performing laser penetration welding, it is beneficial to improve the welding yield and efficiency.

[0046] In some embodiments, a counterbore 205 is provided at a position corresponding to the groove 201 on the outer surface of the first riveting portion 202.

[0047] Specifically, a counterbore 205 is provided at the corresponding position on the outer surface of the first riveting portion 202 and the groove 201, that is, the counterbore 205 is provided on the outer surface of the bottom wall of the groove 201. The position of the counterbore 205 is the welding area, and the counterbore 205 is recessed from the outer surface of the first riveting portion 202, which can prevent the welding marks from protruding.

[0048] In some embodiments, a first guiding portion 207 is provided between the first welding portion 204 and the second riveting portion 203, and a second guiding portion 404 is provided between the second welding portion 403 and the pole post boss 402. The first guiding portion 207 and the second guiding portion 404 cooperate to guide the insertion of the pole post boss 402 into the groove 201.

[0049] By providing the first guiding portion 207 and the second guiding portion 404, during the insertion process of the pole post 4 into the groove 201 of the riveting member 2, the first guiding portion 207 and the second guiding portion 404 cooperate with each other, facilitating the quick assembly of the pole post 4 into the groove 201 of the riveting member 2. Specifically, the first guiding portion 207 can be an inclined surface or a curved surface, and the second guiding portion 404 is adapted to the first guiding portion 207. As Figure 4 and Figure 7 shown, in this embodiment, both the first guiding portion 207 and the second guiding portion 404 are arc surfaces.

[0050] In some embodiments, the pole post bottom plate 401 and the pole post boss 402 are integrally formed.

[0051] The integral formation of the pole post bottom plate 401 and the pole post boss 402 facilitates rapid processing and improves production efficiency.

[0052] In some embodiments, the pole post bottom plate 401 includes a first connecting portion 4011 and a second connecting portion 4012, and the pole post boss 402 is provided on the first connecting portion 4011; the pole ear 301 is welded to the second connecting portion 4012 after being bent radially along the mounting hole from its root.

[0053] As Figures 8 to 11 shown, after the pole ear 301 is led out from the pole group 3, it extends radially along the mounting hole to form an "L" - shaped structure. The pole ear 301 presses on the surface of the second connecting portion 4012 of the pole post 4, and the pole ear 301 and the second connecting portion 4012 of the pole post 4 are conductively connected through laser penetration welding. In addition, with the pole ear 301 arranged in this way, space can be saved and the bending difficulty can be reduced.

[0054] Furthermore, in this embodiment, the second connecting portion 4012 is a U - shaped structure and is divided into two pole ear connecting portions. Two pole ears 301 are led out from the corresponding positions of the pole group 3, and the two pole ears 301 are respectively folded inward from the outside of the second connecting portion 4012, respectively pressing on the surfaces of the two pole ear connecting portions and being welded.

[0055] In some embodiments, an insulating member 6 and a sealing member 7 are further included. The insulating member 6 is disposed between the first riveting portion 202 and the upper surface of the cover body 1; the sealing member 7 includes a first sealing portion and a second sealing portion. The first sealing portion is disposed between the second riveting portion 203 and the inner wall of the mounting hole, and the second sealing portion is disposed between the second riveting portion 203 and the inner surface of the cover body 1.

[0056] Specifically, referring to Figure 15 . By providing the insulating member 6, an insulating connection between the riveting member 2 and the cover body 1 can be achieved. By providing the sealing member 7, the sealing performance of the battery cell 10 can be improved, and thus the safety performance of the battery cell 10 can be enhanced.

[0057] Furthermore, the battery cell 10 further includes a housing 8 having a cavity therein, and the electrode assembly 3 is disposed in the cavity of the housing 8. A cover assembly composed of components such as the cover body 1 and the riveting member 2 is assembled to one end of the housing 8 to encapsulate the electrode assembly 3 in the housing 8.

[0058] The battery cell 10 provided by the embodiment of the present utility model can save the internal space of the battery cell 10. The battery cell 10 of the same volume can provide greater energy. At the same time, the number of components is reduced and the processes are decreased, thereby improving the production efficiency, saving costs, and enhancing the competitiveness of the product.

[0059] According to an embodiment of the present utility model, on the other hand, a battery pack is further provided, which includes a plurality of battery cells 10 according to any one of the above technical solutions.

[0060] Since the battery pack includes the battery cell 10 and has the same effects as the battery cell 10, it will not be elaborated herein.

[0061] Specifically, the battery pack further includes an upper housing, a lower housing, and a battery module disposed between the upper housing and the lower housing. A plurality of battery cells 10 according to any one of the above embodiments are connected in series to form a battery module, which is fixed between the upper housing and the lower housing.

[0062] Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that: include: A cover plate assembly, the cover plate assembly comprising a cover plate body and a rivet, the cover plate body being provided with a mounting hole, the rivet being provided in the mounting hole and riveted to the cover plate body, the rivet having a groove opening toward one side of the cover plate body; A pole group, wherein the pole group is provided with pole ears; A pole, the pole comprising a pole bottom plate extending radially along the mounting hole and a pole boss arranged on the pole bottom plate and extending axially along the mounting hole, the pole bottom plate and the pole ear are welded, the pole boss is plugged into the groove of the rivet, and the pole boss and the rivet are welded.

2. The battery cell according to claim 1, characterized in that: The rivet comprises a first rivet portion extending radially along the mounting hole and a second rivet portion provided on the first rivet portion and extending axially along the mounting hole, the first rivet portion being provided on the outer surface of the cover body, the second rivet portion being provided in the mounting hole, the groove being provided on the second rivet portion, a third rivet portion extending radially along the mounting hole being formed around the groove, and the third rivet portion being provided on the inner surface of the cover body.

3. The battery cell according to claim 2, characterized in that: The bottom wall of the groove constitutes a first welding portion, the top of the pole boss is formed with a second welding portion, and the first welding portion and the second welding portion are welded to form a first weld mark.

4. The battery cell according to claim 3, characterized in that: The thickness of the second welding portion is greater than or equal to the thickness of the first welding portion.

5. The battery cell according to claim 3 or 4, characterized in that: A sink is provided on the outer surface of the first riveted portion at a position corresponding to the groove.

6. The battery cell according to claim 3 or 4, characterized in that: A first guide portion is provided between the third riveted portion and the second riveted portion, a second guide portion is provided between the second welding portion and the pole boss, and the first guide portion cooperates with the second guide portion to guide the insertion of the pole boss and the groove.

7. The battery cell according to any one of claims 1 to 4, characterized in that: The pole bottom plate and the pole boss are integrally formed.

8. The battery cell according to any one of claims 1 to 4, characterized in that: The pole bottom plate includes a first connection portion and a second connection portion, and the pole boss is arranged on the first connection portion; the pole lug is welded to the second connection portion after its root portion is bent along the radial direction of the mounting hole.

9. The battery cell according to any one of claims 2 to 4, characterized in that: Also includes: an insulating member, disposed between the first riveted portion and the upper surface of the cover body; The sealing member includes a first sealing portion and a second sealing portion, wherein the first sealing portion is arranged between the second riveted portion and the inner wall of the mounting hole, and the second sealing portion is arranged between the third riveted portion and the inner surface of the cover body.

10. A battery pack, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 9.

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