Battery shell, single battery cell and battery pack

Abstract

The utility model relates to a battery shell, a single battery cell and a battery pack. The battery shell comprises a battery shell body which is provided with an opening; the top cover body is arranged at the opening of the battery shell in a covering manner; the end face, facing the top cover body, of the battery shell is an upper end face, and the upper end face is provided with a first area and a second area arranged on the circumferential outer side of the first area; the top cover body is assembled in a first area of a battery shell, and a welding gap is formed between a second area of the battery shell and the circumferential outer wall of the top cover body. The battery shell solves the problems that the side welding bulges of the traditional side welding are higher, and the modules are easy to rub, and has the advantage of low welding seam bulges; and meanwhile, the problem of low compression strength of a large battery cell vertical welding product is solved, and the advantage of higher welding strength is achieved.

Description

Technical Field

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

[0002] According to the battery size and structure, the top cover sealing welding of square aluminum shell batteries can be divided into two processes: top cover vertical welding and top cover side welding.

[0003] However, it is found in actual top cover side welding that since multiple single cells will be assembled into a module, when the side welding protrusion of the existing top cover side welding is relatively high, friction is likely to occur between adjacent modules, and there is room for improvement. Summary of the Utility Model

[0004] In order to overcome at least one of the above-mentioned defects of the prior art, according to one aspect of the present utility model, a battery housing is provided, including:

[0005] A battery housing body provided with an opening;

[0006] A top cover body covering the opening of the battery housing body; the end face of the battery housing body facing the top cover body is set as the upper end face, and a first area and a second area arranged on the circumferential outer side of the first area are provided on the upper end face;

[0007] The top cover body is assembled in the first area of the battery housing body, and a welding notch is formed between the second area of the battery housing body and the circumferential outer wall of the top cover body.

[0008] In an embodiment of the present application, in the width direction of the battery housing, the width D1 of the welding notch ranges from 0.05 mm to 0.15 mm;

[0009] In the length direction of the battery housing, the width D2 of the welding notch ranges from 0.05 mm to 0.15 mm.

[0010] In an embodiment of the present application, the width D1 of the welding notch ranges from 0.05 mm to 0.1 mm, and the width D2 of the welding notch ranges from 0.05 mm to 0.1 mm.

[0011] In an embodiment of the present application, the width D1 of the welding notch is 0.1 mm, and the width D2 of the welding notch is 0.1 mm.

[0012] In an embodiment of the present application, in the width direction of the battery housing, the width of the welding notch is D1; in the length direction of the battery housing, the width of the welding notch is D2; wherein, D1 = D2.

[0013] In one embodiment of the present application, in the height direction of the battery housing, the range of the height H1 between the top of the battery housing and the top of the top cover body is: 0.4 mm ≤ H1 ≤ 0.8 mm.

[0014] In one embodiment of the present application, the height H1 between the top of the battery housing and the top of the top cover body is 0.6 mm.

[0015] In one embodiment of the present application, the top cover body is provided with an assembly notch facing the bottom of the battery housing, and the top cover body is clamped at the opening of the battery housing through the assembly notch.

[0016] According to another aspect of the present application, a single cell is provided, including the above-mentioned battery housing, and the battery housing is a square housing.

[0017] According to another aspect of the present application, a battery pack is provided, including the above-mentioned single cell.

[0018] In summary, a battery housing, a single cell, and a battery pack provided by the present utility model have the following technical effects:

[0019] This battery housing solves the problems that the side welds of the traditional side welding have relatively high protrusions and it is easy for the modules to rub against each other, and has the advantage of low weld bead protrusions; at the same time, it also solves the problem of low pressure resistance strength of the large cell vertical welding products, and has the advantage of higher welding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the battery housing according to the embodiment of the present utility model;

[0021] Figure 2 is Figure 1 a partial enlarged view of A in;

[0022] Figure 3 It is a schematic front view structural diagram of the battery housing according to the embodiment of the present utility model;

[0023] Figure 4 is Figure 3 a partial enlarged view of B in;

[0024] Figure 5 It is a schematic top view structural diagram of the battery housing according to the embodiment of the present utility model;

[0025] Figure 6 It is a schematic internal structure cross-sectional view of the front view of the battery housing according to the embodiment of the present utility model;

[0026] Attached drawings: 1 - battery housing, 11 - first region, 12 - second region, 2 - top cover body, 21 - assembly notch, 22 - circumferential outer wall, 3 - welding notch. Detailed implementation mode

[0027] For better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the attached drawings in the embodiments of the present utility model.

[0028] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model in this article are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0030] An embodiment of the present utility model discloses a battery housing, which can be specifically referred to Figures 1-6 . Specifically, this battery housing includes a battery housing 1, and the battery housing 1 is provided with an opening. In the illustrated embodiment, a cavity for assembling the battery cell is provided in the battery housing 1, and the cavity extends upward to the upper end surface of the battery housing 1 to form an opening.

[0031] This battery housing further specifically includes a top cover body 2, and the top cover body 2 is covered at the opening of the battery housing 1; the end surface of the battery housing 1 facing the top cover body 2 is set as the upper end surface, and a first region 11 and a second region 12 provided on the circumferential outside of the first region 11 are provided on the upper end surface; the top cover body 2 is assembled in the first region 11 of the battery housing 1, and a welding notch 3 is formed between the second region 12 of the battery housing 1 and the circumferential outer wall 22 of the top cover body 2.

[0032] In view of the problem that the side welding protrusion of the existing top cover side welding is relatively high and it is easy to generate friction between adjacent modules, this battery housing is provided with a welding notch 3 between the battery housing 1 and the top cover body 2. Therefore, when performing top cover side welding, the weld seam generated during welding will be placed in the welding notch 3, which is equivalent to increasing the contact spacing of the welding protrusions between the modules and can well solve the problem that it is easy to generate friction between adjacent modules. Moreover, the welding process method adopts the side welding process, which solves the problem of low pressure resistance strength of the large battery cell vertical welding product and has the advantage of higher welding strength.

[0033] In summary, the battery housing solves the problems of the relatively high protrusion of the traditional side welding and the easy friction between modules, and has the advantage of low weld protrusion; at the same time, it also solves the problem of low pressure resistance of the large cell vertical welding product and has the advantage of higher welding strength.

[0034] It should be noted that the welding notch 3 can be specifically formed by the upper end surface of the second region 12 of the battery housing 1 and the circumferential outer wall 22 of the top cover body 2, and will specifically form a stepped structure.

[0035] In actual welding, it is found that the existing side welding protrusions usually protrude 0.15 mm or more from the outer side wall of the battery housing 1, which is likely to cause friction problems. Multiple tests with different sizes of welding protrusions were carried out. In multiple tests, it was found that controlling the size of the welding protrusion within 0.1 mm can solve the friction problem. Therefore, there are certain requirements for the width of the welding notch 3 itself.

[0036] In one optional embodiment, in the width direction of the battery housing, the range of the width D1 of the welding notch 3 is: 0.05 mm ≤ D1 ≤ 0.15 mm; in the length direction of the battery housing, the range of the width D2 of the welding notch 3 is: 0.05 mm ≤ D2 ≤ 0.15 mm. The reason for selecting the width D1 and width D2 of the welding notch 3 within the range of 0.05 mm - 0.15 mm is that since the size of the actual welding protrusion usually protrudes 0.15 mm or more. For example, when the existing welding protrusion is 0.15 mm, after adopting the welding notch 3 structure of the present application, even if the width D1 and width D2 of the welding notch 3 are set to the minimum value of 0.05 mm, the welding protrusion can be controlled to 0.1 mm, effectively solving the friction problem. Another example is that when the existing welding protrusion is 0.25 mm, although the occurrence of such a welding protrusion size is rare, in order to have a larger tolerance, the width D1 and width D2 of the welding notch 3 can be set to the maximum value of 0.15 mm, and the welding protrusion can also be controlled to 0.1 mm, effectively solving the friction problem.

[0037] The width D1 of the welding notch 3 can be 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm or 0.15 mm. In other embodiments, the width D1 of the welding notch 3 can also be other values within the range of 0.05 mm ≤ D1 ≤ 0.15 mm.

[0038] The width D2 of the welding notch 3 can be 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm or 0.15 mm. In other embodiments, the width D2 of the welding notch 3 can also be other values within the range of 0.05 mm ≤ D2 ≤ 0.15 mm.

[0039] In an alternative embodiment, the range of the width D1 of the welding notch 3 is: 0.05 mm ≤ D1 ≤ 0.1 mm, and the range of the width D2 of the welding notch 3 is: 0.05 mm ≤ D2 ≤ 0.1 mm. In actual welding, the existing side welding protrusions are usually between 0.15 mm and 0.2 mm. Therefore, the ranges of the width D1 and the width D2 of the welding notch 3 can be controlled within 0.05 mm - 0.1 mm. With such a setting, enough space of the welding notch 3 can be provided to accommodate the weld protrusion, and at the same time, the connection strength between the battery case 1 and the top cover body 2 can be ensured.

[0040] In an alternative embodiment, the width D1 of the welding notch 3 = 0.1 mm, and the width D2 of the welding notch 3 = 0.1 mm. With such a setting, a structure with equal dimensions of the surrounding areas of the welding notch 3 can be formed, and the size is 0.1 mm. The structure is simple, which is convenient for manufacturing and production and reduces the manufacturing difficulty.

[0041] In an alternative embodiment, in the width direction of the battery housing, the width of the welding notch 3 is D1; in the length direction of the battery housing, the width of the welding notch 3 is D2; wherein, D1 = D2. With such a setting, a structure with equal dimensions of the surrounding areas of the welding notch 3 can be formed. The structure is simple, which is convenient for manufacturing and production and reduces the manufacturing difficulty.

[0042] In an alternative embodiment, in the height direction of the battery housing, the range of the height H1 between the top of the battery case 1 and the top of the top cover body 2 is: 0.4 mm ≤ H1 ≤ 0.8 mm. With such a setting, enough welding notch 3 can be provided to accommodate the weld protrusion, and at the same time, the connection strength between the battery case 1 and the top cover body 2 can be ensured.

[0043] The height H1 between the top of the battery case 1 and the top of the top cover body 2 can be 0.5 mm, 0.6 mm, 0.7 mm or 0.8 mm. In other embodiments, the height H1 between the top of the battery case 1 and the top of the top cover body 2 can also be other values within the range of 0.4 mm ≤ H1 ≤ 0.8 mm.

[0044] In one optional embodiment, an assembly notch 21 is provided on one side of the top cover body 2 facing the battery housing 1, and the top cover body 2 is clamped at the opening of the battery housing 1 through the assembly notch 21. In the illustrated embodiment, the assembly notch 21 is provided at the bottom of the top cover body 2 facing the battery housing 1. With this arrangement, a stable clamping structure can be formed through the assembly notch 21, and the top cover body 2 can be stably fixed at the opening of the battery housing 1, thereby improving the overall structural stability.

[0045] The embodiment of the present utility model also discloses a single cell, including the above-mentioned battery housing. Therefore, it can be seen that this single cell can also effectively avoid the protrusion of the side-welded seams, and thus avoid the problem that friction is likely to occur between adjacent modules, having the advantage of low weld protrusion. Moreover, the welding process method adopts the side-welding process, which solves the problem of low withstand voltage strength of the large cell vertical-welding product, having the advantage of higher welding strength.

[0046] In one optional embodiment, the battery housing is a square housing to improve the structural stability of the square battery.

[0047] The embodiment of the present utility model also discloses a battery pack, including the above-mentioned single cell. Among them, multiple cells can be combined into modules, and this battery pack can include multiple modules. Therefore, this battery pack can also effectively avoid the protrusion of the side-welded seams, and thus avoid the problem that friction is likely to occur between adjacent modules, having the advantage of low weld protrusion. Moreover, the welding process method adopts the side-welding process, which solves the problem of low withstand voltage strength of the large cell vertical-welding product, having the advantage of higher welding strength.

[0048] The technical means disclosed in the solution of the present utility model are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present utility model.

Claims

1. A battery casing, characterized in that, Comprising: A battery case (1), the battery case (1) being provided with an opening; A top cover body (2), the top cover body (2) being covered at the opening of the battery case (1); the end face of the battery case (1) facing the top cover body (2) is set as the upper end face and a first region (11) is provided on the upper end face and a second region (12) is provided on the circumferential outer side of the first region (11); The top cover body (2) is assembled in the first region (11) of the battery case (1), and a welding notch (3) is formed between the second region (12) of the battery case (1) and the circumferential outer wall (22) of the top cover body (2).

2. A battery housing according to claim 1, characterized in that, In the width direction of the battery case, the width D1 of the welding notch (3) ranges from: 0.05 mm ≤ D1 ≤ 0.15 mm; In the length direction of the battery case, the width D2 of the welding notch (3) ranges from: 0.05 mm ≤ D2 ≤ 0.15 mm.

3. A battery housing according to claim 2, wherein The width D1 of the welding notch (3) ranges from: 0.05 mm ≤ D1 ≤ 0.1 mm, and the width D2 of the welding notch (3) ranges from: 0.05 mm ≤ D2 ≤ 0.1 mm.

4. A battery housing according to claim 3, wherein, The width D1 of the welding notch (3) = 0.1 mm, and the width D2 of the welding notch (3) = 0.1 mm.

5. A battery housing according to claim 1, characterized in that, In the width direction of the battery case, the width of the welding notch (3) is D1; in the length direction of the battery case, the width of the welding notch (3) is D2; wherein, D1 = D2.

6. A battery housing according to any one of claims 1-5, characterized in that In the height direction of the battery case, the height H1 between the top of the battery case (1) and the top of the top cover body (2) ranges from: 0.4 mm ≤ H1 ≤ 0.8 mm.

7. A battery housing according to claim 6, characterized in that, The height H1 between the top of the battery case (1) and the top of the top cover body (2) = 0.6 mm.

8. A battery housing according to any one of claims 1-5, characterized in that, The top cover body (2) is provided with an assembly notch (21) facing the bottom of the battery case (1), and the top cover body (2) is clamped at the opening of the battery case (1) through the assembly notch (21).

9. A single cell, characterized in that, Comprising a battery case according to any one of claims 1-8, the battery case being a square case.

10. A battery pack, characterized in that, Comprising a single cell according to claim 9.

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