Battery

Abstract

The utility model discloses a battery which comprises a battery cell, a shell and a cover plate, the battery cell is sleeved in the shell, the cover plate is mounted on the shell, a tab is arranged on the battery cell, a pole corresponding to the tab is arranged on the cover plate, and the tab and the pole are welded and connected through a connecting piece; a groove-shaped notch is formed in the middle of the top end of the tab and corresponds to the pole, a pole welding area is formed in the area, corresponding to the groove-shaped notch, of the connecting piece, and a tab welding area is formed in the area, overlapped with the tab, of the connecting piece; the connecting sheet is connected with the pole in a welding manner through the pole welding area, and the connecting sheet is connected with the tab in a welding manner through the tab welding area. The battery disclosed by the utility model can meet the welding connection requirements of the tabs and the poles.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric energy storage, and specifically relates to a battery. Background Art

[0002] The general structure of a battery includes a shell and a battery cell arranged in the shell. Specifically, the shell is provided with an opening side for the battery cell to enter and exit. After the battery cell is installed in the shell, a cover plate is installed on the opening side of the shell. A pole is installed on the cover plate, and a pole lug is provided on the battery cell. The pole and the pole lug are usually connected by welding with a connecting piece. That is, the two sides of the connecting piece need to be welded with the pole and the pole lug respectively. Therefore, the pole welding area corresponding to the pole and the pole lug welding area corresponding to the pole lug on the connecting piece need to be staggered. Similarly, the pole lug and the corresponding pole also need to be staggered to avoid the problem that the pole welding area and the pole lug welding area overlap, resulting in the connection piece being unable to be welded with the pole lug and the pole at the same time. However, when the thickness of the battery is thin, if the pole lug welding area and the pole welding area are staggered, the area of ​​the pole lug welding area and the pole welding area will be too small, which will lead to insufficient welding strength on the one hand, and will affect the overcurrent area on the other hand, which is not suitable for large current charging and discharging. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a battery that can meet the welding connection requirements of the pole lug and the pole.

[0004] In order to achieve the above object, the utility model provides the following technical solutions:

[0005] A battery comprises a battery cell, a shell and a cover plate, wherein the battery cell is sleeved in the shell, the cover plate is mounted on the shell, the battery cell is provided with a pole lug, the cover plate is provided with a pole post corresponding to the pole lug, the pole lug and the pole post are welded and connected via a connecting piece; a groove-shaped notch is provided at the middle part of the top end of the pole lug corresponding to the pole post, the area of ​​the connecting piece corresponding to the groove-shaped notch forms a pole post welding area, and the area of ​​the connecting piece overlapping with the pole lug forms a pole lug welding area; the connecting piece is welded and connected to the pole post via the pole post welding area, and the connecting piece is welded and connected to the pole lug via the pole lug welding area.

[0006] Furthermore, the cover plate is provided with a mounting hole for mounting a pole, the pole is mounted in the mounting hole, and an insulating layer is provided between the pole and the cover plate.

[0007] Furthermore, the tab welding area includes three welding partitions, which are two side welding partitions located on both sides of the pole welding area and a root welding partition located below the pole welding area.

[0008] Furthermore, at least one first welding line is provided between the side welding partition and the pole lug, and at least one second welding line is provided between the root welding partition and the pole lug.

[0009] Furthermore, the second welding line crosses both ends of the electrode tab.

[0010] Furthermore, the battery cell is provided with at least one positive electrode tab and at least one negative electrode tab, and the number of the positive electrode tabs and the number of the negative electrode tabs are equal.

[0011] Furthermore, the battery cell is provided with two groups of pole tabs, which are respectively arranged on both sides of the battery cell, and each group of pole tabs includes a positive pole tab and a negative pole tab.

[0012] Furthermore, in the two electrode tabs of the two groups, the positive electrode tab is located on the same side of the negative electrode tab.

[0013] Furthermore, the number of the battery cells is two, the connecting sheet is provided with tab welding areas corresponding to the two battery cells respectively, and the connecting sheet is welded and connected to the tabs of the two battery cells respectively through the two tab welding areas.

[0014] The beneficial effects of the utility model are:

[0015] The battery of the utility model is provided with a groove-shaped notch at the top end of the pole ear corresponding to the pole, so that the area corresponding to the connecting piece and the groove-shaped notch is set as the pole welding area, and the other area where the connecting piece and the pole ear overlap is used as the pole ear welding area. The connecting piece is welded to the pole via the pole welding area, and the connecting piece is welded to the pole ear via the pole ear welding area. It is only necessary to provide the groove-shaped notch on the pole ear corresponding to the pole, and there is no need for staggered arrangement between the pole and the pole ear, so as to facilitate the structural design and processing of the battery.

[0016] In the utility model, the groove-shaped notch divides the pole ear welding area into three welding partitions, which are respectively two side welding partitions located on both sides of the groove-shaped notch and a root welding partition located below the groove-shaped notch. The two side welding areas can increase the welding area between the connecting piece, thereby enhancing the welding connection strength. At least one second welding line running through the two ends of the pole ear is arranged in the root welding partition, which can increase the flow area between the pole ear and the connecting piece to meet the use requirements of large current charging and discharging. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model is described with the following drawings:

[0018] Figure 1 It is a schematic diagram of the structure of the battery of the utility model, specifically a schematic diagram of the structure after the shell is hidden;

[0019] Figure 2 for Figure 1 A magnified image of area A;

[0020] Figure 3 is a structural schematic diagram of the cover plate;

[0021] Figure 4 is a schematic diagram of the structure of the connecting piece;

[0022] Figure 5 This is a schematic diagram of the structure when there are two battery cells.

[0023] Description of reference numerals:

[0024] 1-battery cell; 11-ear; 12-slot notch;

[0025] 2-cover plate; 21-pole; 22-insulating layer;

[0026] 3-connecting piece; 31-pole welding area; 32-ear welding area; 321-side welding partition; 3211-first welding line; 322-root welding partition; 3221-second welding line. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0028] like Figure 1-2 As shown, the battery of this embodiment includes a battery cell 1, a shell and a cover plate 2, the battery cell 1 is sleeved in the shell, the cover plate 2 is installed on the shell, the battery cell 1 is provided with a pole lug 11, and the cover plate 2 is provided with a pole post 21 corresponding to the pole lug 11, and the pole lug 11 and the pole post 21 are welded and connected through a connecting piece 3. Specifically, in this embodiment, a groove-shaped notch 12 is provided at the middle of the top of the pole lug 11 corresponding to the pole post 21, and the area corresponding to the groove-shaped notch 12 of the connecting piece 3 forms a pole post welding area 31, and the area on the connecting piece 3 that overlaps with the pole lug 11 forms a pole lug welding area 32. That is, in this embodiment, the connecting piece 3 is welded and connected to the pole post 21 through the pole post welding area 31, and the connecting piece 3 is welded and connected to the pole lug 11 through the pole lug welding area 32.

[0029] Specifically, Figure 3 As shown, in this embodiment, a mounting hole for mounting a pole 21 is provided on the cover plate 2, the pole 21 is installed in the mounting hole, and an insulating layer 22 is provided between the pole 21 and the cover plate 2 to avoid a short circuit between the pole 21 and the cover plate 2.

[0030] Specifically, Figure 4As shown, in this embodiment, the tab welding area 32 includes three welding partitions, which are two side welding partitions 321 located on both sides of the pole welding area 31 and a root welding partition 322 located below the pole welding area 31. At least one first welding line 3211 is provided between the side welding partition 321 and the tab 11, and at least one second welding line 3221 is provided between the root welding partition 322 and the tab 11. In this embodiment, two first welding lines 3211 are provided between the two side welding partitions 321 and the tab 11, respectively. Specifically, the number of the first welding lines 3211 is set according to actual conditions, and will not be repeated. In this embodiment, a second welding line 3221 is provided between the root welding partition 322 and the tab 11. Similarly, the number of the second welding lines 3221 is set according to actual conditions. In this embodiment, the second welding line 3221 crosses the two ends of the tab 11, so that the tab 11 and the connecting sheet 3 can meet the charging and discharging requirements of large currents.

[0031] Furthermore, at least one positive electrode tab and at least one negative electrode tab are provided on the battery cell 1, and the number of positive electrode tabs and negative electrode tabs is equal. In the present embodiment, two groups of tabs are provided on the battery cell 1, and the two groups of tabs are respectively arranged on both sides of the battery cell, and each group of tabs includes a positive electrode tab and a negative electrode tab, that is, in the present embodiment, two positive electrode tabs and two negative electrode tabs are provided on the battery cell 1. Specifically, in the two tabs of the two groups in the present embodiment, the positive electrode tab is located on the same side of the negative electrode tab. When the surface area of ​​the battery cell 1 is large, by arranging a plurality of positive electrode tabs and a plurality of negative electrode tabs on the battery cell 1, when the battery cell 1 is in the process of charging and discharging, the distance from any position in the battery cell 1 to the nearest positive electrode tab or negative electrode tab is small, so as to reduce the internal resistance of the battery cell 1 during the charging and discharging process, and at the same time, the charging and discharging uniformity and consistency of the battery cell 1 can also be improved.

[0032] Specifically, Figure 5 As shown, in some other embodiments, the number of battery cells 1 may be two, and the connecting sheet 3 is provided with tab welding areas 32 corresponding to the two battery cells 1 , respectively, and the connecting sheet 3 is welded to the tabs 11 of the two battery cells 1 through the two tab welding areas 32 .

[0033] The above-described embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. A battery, comprising a battery cell, a shell and a cover plate, wherein the battery cell is sleeved in the shell, and the cover plate is mounted on the shell, characterized in that: The battery cell is provided with a pole lug, and a pole column is provided on the cover plate corresponding to the pole lug, and the pole lug and the pole column are welded and connected via a connecting piece; a slot-shaped notch is provided at the middle of the top end of the pole lug corresponding to the pole column, and the area corresponding to the connecting piece and the slot-shaped notch forms a pole column welding area, and the area on the connecting piece overlapping the pole lug forms a pole lug welding area; The connecting piece is welded to the pole via the pole welding area, and the connecting piece is welded to the pole tab via the pole tab welding area.

2. The battery according to claim 1, characterized in that: The cover plate is provided with a mounting hole for mounting a pole, the pole is mounted in the mounting hole, and an insulating layer is provided between the pole and the cover plate.

3. The battery according to claim 1, characterized in that: The pole lug welding area includes three welding zones, which are two side welding zones located on both sides of the pole welding area and a root welding zone located below the pole welding area.

4. The battery according to claim 3, characterized in that: At least one first welding line is provided between the side welding partition and the pole lug, and at least one second welding line is provided between the root welding partition and the pole lug.

5. The battery according to claim 4, characterized in that: The second welding line crosses two ends of the electrode tab.

6. The battery according to claim 1, characterized in that: The battery cell is provided with at least one positive electrode tab and at least one negative electrode tab, and the number of the positive electrode tabs and the number of the negative electrode tabs are equal.

7. The battery according to claim 6, characterized in that: The battery cell is provided with two groups of pole tabs, which are respectively arranged on both sides of the battery cell, and each group of pole tabs includes a positive pole tab and a negative pole tab.

8. The battery according to claim 7, characterized in that: In the two electrode tabs of the two groups, the positive electrode tab is located on the same side of the negative electrode tab.

9. The battery according to any one of claims 1 to 8, characterized in that: There are two battery cells, and the connecting sheet is provided with tab welding areas corresponding to the two battery cells respectively, and the connecting sheet is welded and connected to the tabs of the two battery cells respectively through the two tab welding areas.

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