Power battery aluminum shell

Abstract

The utility model relates to the technical field of lithium batteries, in particular to a power battery aluminum shell. The power battery aluminum shell comprises an aluminum shell body and is characterized in that the aluminum shell body 1 comprises two long-edge side walls 2, two short-edge side walls 3 and a bottom wall 4, and the aluminum shell body 1 is of a hollow structure with a top opening; the long-edge side wall (2) is a thin wall, the short-edge side wall (3) is a thick wall, the wall thickness of the long-edge side wall (2) is 0.4-0.6 mm, and the wall thickness of the short-edge side wall (3) is 0.6-0.8 mm. The power battery aluminum shell provided by the utility model has ultra-thin wall thickness and light weight, can ensure the compression strength and the welding sealing performance of the aluminum shell, and effectively reduces the production cost.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to an aluminum shell of a power battery. Background Art

[0002] Aluminum shell lithium-ion power batteries are highly favored by the market due to their advantages such as light weight, high energy density and good heat dissipation. In recent years, with the rapid development of new energy vehicles, the market share has increased rapidly, and the demand for power batteries has also increased accordingly.

[0003] According to the battery shell, power batteries are generally divided into steel shell power batteries and aluminum shell power batteries. Among them, aluminum shell power batteries have the characteristics of small size, light weight, strong power, no memory and green environmental protection, so aluminum shell power batteries are likely to replace steel shell power batteries. Usually, the inner and outer sides of the opening of the power battery aluminum shell are right-angled edges, and after assembly with the top cover sheet, they are welded around the two contact plane ends, but there are many process risks when the battery aluminum shell is set at a right angle.

[0004] In addition, the sides of traditional battery aluminum shells are thicker than the main surface, in order to prevent them from sinking when they are buckled with the top cover, but the extra thickness increases the overall weight of the battery and increases the production cost. Therefore, it is urgent to develop a power battery aluminum shell with ultra-light weight and ultra-thin wall thickness. Utility Model Content

[0005] The purpose of the utility model is to overcome the problems of heavy weight and high production cost of the power battery aluminum shell in the prior art, and to provide a power battery aluminum shell. The power battery aluminum shell provided by the utility model has an ultra-thin wall thickness and a small weight, while ensuring the compressive strength and welding sealing performance of the aluminum shell, effectively reducing the production cost.

[0006] In order to achieve the above-mentioned purpose, the utility model provides an aluminum shell for a power battery, including an aluminum shell body, wherein the aluminum shell body 1 includes two long side walls 2, two short side walls 3 and a bottom wall 4, and the aluminum shell body 1 is a hollow structure with a top opening; the long side walls 2 are thin walls, and the short side walls 3 are thick walls, wherein the wall thickness of the long side walls 2 is 0.4-0.6mm, and the wall thickness of the short side walls 3 is 0.6-0.8mm.

[0007] Preferably, the wall thickness of the long side wall 2 is 0.45-0.55 mm, and the wall thickness of the short side wall 3 is 0.65-0.75 mm.

[0008] Through the above technical solution, the utility model has the following beneficial effects:

[0009] The power battery aluminum shell provided by the utility model comprises an aluminum shell body, which comprises two long side walls, two short side walls and a bottom wall. The long side walls are thin walls, and the short side walls are thick walls. The aluminum shell body has an ultra-thin wall thickness. Under the condition of ensuring the compressive strength and welding sealing performance of the aluminum shell, the weight is effectively reduced by 17% compared with the prior art, and the material cost is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention.

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 It is a cross-sectional view of the overall structure of the utility model;

[0013] Figure 3 For this utility model Figure 2 A schematic diagram of the local enlarged structure at D;

[0014] Figure 4 For this utility model Figure 2 Schematic diagram of the local enlarged structure at E.

[0015] Description of Reference Numerals

[0016] 1Aluminum shell body 2Long side wall 3Short side wall

[0017] 4 bottom wall 5 connecting surface 6 abutting surface

[0018] 7 arc portion D abutment portion E rounded corner

[0019] R1 inner fillet R2 outer fillet R3 outer fillet DETAILED DESCRIPTION

[0020] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0021] The utility model provides a power battery aluminum shell, such as Figure 1As shown, it includes an aluminum shell body, wherein the aluminum shell body 1 includes two long side walls 2, two short side walls 3 and a bottom wall 4, and the aluminum shell body 1 is a hollow structure with a top opening; the long side walls 2 are thin-walled, and the short side walls 3 are thick-walled, and the wall thickness of the long side walls 2 is 0.4-0.6mm, and the wall thickness of the short side walls 3 is 0.6-0.8mm.

[0022] In the present invention, the structure of the aluminum shell body 1 is not particularly limited, and may be a conventional aluminum shell body structure in the art. Preferably, the aluminum shell body 1 is a hollow rectangular parallelepiped structure.

[0023] In the utility model, the aluminum shell body 1 includes two long side walls 2, two short side walls 3 and a bottom wall 4. The long side walls 2 and the short side walls 3 of the aluminum shell body 1 are connected end to end and arranged on one side of the bottom wall 4, and together with the bottom wall 4 form a hollow structure with a top opening.

[0024] In the present invention, the long side wall 2 is a thin wall, and the short side wall 3 is a thick wall. In some embodiments of the present invention, preferably, the wall thickness of the long side wall 2 is 0.4-0.6mm, for example, it can be 0.4mm, 0.45mm, 0.47mm, 0.51mm, 0.53mm, 0.55mm, 0.6mm, and any value in the range of any two values, more preferably 0.45-0.55mm; the wall thickness of the short side wall 3 is 0.6-0.8mm, for example, it can be 0.6mm, 0.63mm, 0.66mm, 0.69mm, 0.72mm, 0.75mm, 0.78mm, 0.8mm, and any value in the range of any two values, more preferably 0.65-0.75mm. The battery aluminum shell of the utility model has an ultra-thin wall thickness, and the wall thickness of the long side wall is relatively thin, so that the weight of the battery aluminum shell is reduced, the production cost is effectively reduced, and the compressive strength and welding sealing performance of the aluminum shell can be guaranteed.

[0025] In some embodiments of the present invention, preferably, the wall thickness of the long side wall 2 is 0.5 mm, and the wall thickness of the short side wall 3 is 0.7 mm. In the present invention, the battery aluminum shell adopts the preferred wall thickness of the long side wall 2 and the short side wall 3, which is more conducive to achieving the weight reduction of the battery aluminum shell while ensuring the compressive strength and welding sealing performance of the aluminum shell.

[0026] In the present invention, the bottom wall thickness of the aluminum shell body 1 is not particularly limited, and can be the thickness of the bottom wall of the conventional aluminum shell body in the art. Preferably, the bottom wall 4 of the aluminum shell body 1 has a wall thickness of 1-1.2 mm, for example, 1 mm, 1.05 mm, 1.1 mm, 1.15 mm, 1.2 mm, and any value in the range of any two values, more preferably 1.1-1.2 mm.

[0027] In the utility model, the aluminum shell body 1 is a rectangular structure with a hollow top. The side lengths of the side walls are not particularly limited and can be the lengths of the side lengths of the aluminum shell bodies conventionally used in the art. Preferably, the length of the aluminum shell body 1 from the top opening position to the bottom wall 4 is 150-210 mm, more preferably 204±0.3 mm.

[0028] In some embodiments of the present invention, preferably, the upper ends of the two opposite short side walls 3 of the aluminum shell body 1 are respectively provided with abutment portions D near the top opening. In the present invention, the abutment portions D provided in the power battery aluminum shell are conventionally provided in the art, and are used to limit the matching position of the top cover of the power battery aluminum shell and the aluminum shell body 1, which is conducive to ensuring the progress of the welding operation and the welding sealing.

[0029] In the utility model, Figure 2 and Figure 3 As shown, the abutment portion D is specifically arranged at the upper ends of the two opposite short side walls 3 near the top opening, and preferably, the abutment portion D includes a connecting surface 5 and an abutment surface 6. In the present utility model, the abutment portion D is sequentially provided with the connecting surface 5 and the abutment surface 6 in the direction from the top opening of the aluminum shell body 1 to the bottom wall 4.

[0030] In some embodiments of the present invention, preferably, the abutting surface 6 is in the form of an arc surface.

[0031] In the present invention, the angle between the connecting surface 5 and the abutting surface 6 is not particularly limited, for example, it can be greater than or equal to 90°, preferably greater than or equal to 120°, and more preferably 160±5°.

[0032] In the present invention, the length of the connecting surface 5 is not particularly limited. Preferably, the length of the connecting surface 5 is 1.35-1.65 mm, more preferably 1.5 mm. In the present invention, the length of the connecting surface 5 refers to the length from the second end of the connecting surface 5 to the top opening.

[0033] In the present invention, there is no particular limitation on the thickness of the side wall corresponding to the connecting surface 5, as long as it is not greater than the thickness of the short side wall 3. Preferably, the thickness of the side wall corresponding to the connecting surface 5 is 0.4-0.6 mm, more preferably 0.5 mm.

[0034] In some embodiments of the present invention, preferably, the two long side walls 2 and the two short side walls 3 of the aluminum shell body 1 form an arc portion 7 with an arc surface near the inner side of the top opening, the arc surface of the arc portion 7 is connected to the first end of the connecting surface 5, and the second end of the connecting surface 5 is connected to the abutting surface 6. The fillet size of the arc portion 7 is not particularly limited. Preferably, the fillet size of the arc portion 7 is R0.2mm, which is conducive to reducing the risk of metal scratching during assembly. In the present invention, the first end and the second end of the connecting surface 5 refer to the first end and the second end of the connecting surface 5 in the direction from the top opening to the bottom wall 4.

[0035] In the present invention, the bottom connection of each long side wall 2 and the short side wall 3 can be set to a right angle or a rounded angle. Preferably, the connection between each long side wall 2 and each short side wall 3 is provided with a rounded corner E, such as Figure 2 and Figure 4 In the present invention, preferably, the long side wall 2 of the battery aluminum shell is thinner than the short side wall 3, resulting in two outer fillets and one inner fillet at the bottom connection of each long side wall 2 and the short side wall 3. Specifically, the inner fillet is R1, and the outer fillet close to the long side wall 2 is the outer fillet R2, and the outer fillet close to the short side wall 3 is the outer fillet R3, and the radius of the outer fillet R2 is smaller than the radius of the outer fillet R3. There is no special limitation on the radii of the inner and outer fillets of the fillet E, which are related to the wall thickness of the long side wall 2 and the short side wall 3, as long as the use requirements are met. Preferably, the radius of the inner fillet R1 is 0.9-1.5mm, the radius of the outer fillet R2 is 2.4-2.6mm, and the radius of the outer fillet R3 is 0.9-1.1mm; more preferably, the radius of the inner fillet R1 is 1.2mm, the radius of the outer fillet R2 is 1mm, and the radius of the outer fillet R3 is 2.5mm.

[0036] The present invention will be described in detail below through embodiments.

[0037] Example 1

[0038] The aluminum shell body of the power battery aluminum shell is a hollow structural cuboid with a top opening, including two long side walls, two short side walls and a bottom wall, the wall thickness of the two long side walls is 0.5mm, the wall thickness of the two short side walls is 0.7mm, the wall thickness of the bottom wall is 1.2mm, and the length from the top opening position to the bottom wall is 204±0.3mm; a fillet is provided at the connection between each long side wall and each short side wall, the inner fillet radius is 1.2mm, and the outer fillet radius is 1mm and 2.5mm respectively; the arc-shaped portion with an arc surface formed on the inner side of the two long side walls and the two short side walls near the top opening has a size of R0.2mm, and the angle between the connecting surface 5 and the abutting surface 6 arranged in sequence from the bottom wall direction of the top opening of the aluminum shell body is 160±5°, the length of the connecting surface 5 is 1.5mm, and the wall thickness of the connecting surface 5 is 0.5mm. After testing, the weight of the battery aluminum shell is 189g, which is an effective weight reduction of 17% compared with the conventional power battery aluminum shell used in the prior art.

[0039] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including combining various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A power battery aluminum shell, comprising an aluminum shell body, characterized in that: The aluminum shell body (1) comprises two long side walls (2), two short side walls (3) and a bottom wall (4); the aluminum shell body (1) is a hollow structure with a top opening; the long side walls (2) are thin-walled, and the short side walls (3) are thick-walled, wherein the wall thickness of the long side walls (2) is 0.4-0.6 mm, and the wall thickness of the short side walls (3) is 0.6-0.8 mm.

2. The power battery aluminum shell according to claim 1, characterized in that: The wall thickness of the long side wall (2) is 0.45-0.55 mm, and the wall thickness of the short side wall (3) is 0.65-0.75 mm.

3. The power battery aluminum shell according to claim 1, characterized in that: The bottom wall (4) of the aluminum shell body (1) has a wall thickness of 1-1.2 mm.

4. The power battery aluminum shell according to claim 1, characterized in that: Abutment portions (D) are respectively provided at the upper ends of the two opposite short side walls (3) of the aluminum shell body (1) near the top opening.

5. The power battery aluminum shell according to claim 4, characterized in that: The abutting portion (D) comprises a connecting surface (5) and an abutting surface (6).

6. The power battery aluminum shell according to claim 5, characterized in that: The included angle between the connecting surface (5) and the abutting surface (6) is greater than or equal to 120°.

7. The power battery aluminum shell according to claim 5, characterized in that: The length of the connecting surface (5) is 1.35-1.65 mm; the wall thickness of the connecting surface (5) is 0.4-0.6 mm.

8. The power battery aluminum shell according to claim 5, characterized in that: The abutting surface (6) is in the form of an arc-shaped surface.

9. The power battery aluminum shell according to claim 1, characterized in that: The two long side walls (2) and the two short side walls (3) of the aluminum shell body (1) form an arc-shaped portion (7) having an arc-shaped surface on the inner side close to the top opening.

10. The power battery aluminum shell according to claim 1, characterized in that: A rounded corner (E) is provided at the connection between each long side wall (2) and each short side wall (3).

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