Battery case, single battery, and battery pack

Abstract

The application discloses a battery shell, a single battery and a battery pack, which have the advantages of no need of positioning by means of a jig. The battery shell comprises a first shell and a second shell. The first shell comprises a bottom and a first sidewall extending upward from the bottom, the first sidewall surrounds an opening, and an end of the first sidewall forms a first flange in the same plane as the first sidewall. The second shell comprises a top and a second flange, the top is used for covering the opening, the second flange extends downward from the top, the second shell covers the first flange, and the first flange is welded with the second flange.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery casing, a single cell, and a battery pack. Background Technology

[0002] Battery casings are essential components of electronic products and other devices, housing high-voltage batteries, electronic components, sensors, and connectors. They help protect the overall structure and safety of electronic devices, shielding critical parts from potential external impacts, heat, and water seepage. Existing batteries typically consist of a battery casing and battery cells installed inside. After the battery cells are installed, the casing and cover need to be welded together to isolate the cells from the external environment. However, existing casings and covers lack mutual positioning, requiring the use of jigs for positioning during welding, making the process cumbersome. Furthermore, the existing casings and covers have relatively thick walls, making thinning difficult and limiting battery weight.

[0003] Therefore, there is an urgent need to provide a battery casing, individual battery cell, and battery pack that do not require positioning with fixtures to overcome the above-mentioned defects. Summary of the Invention

[0004] The first objective of this invention is to provide a battery casing that does not require positioning with the aid of a fixture.

[0005] A second objective of the present invention is to provide a single-cell battery comprising the battery casing described above.

[0006] A third objective of the present invention is to provide a battery pack comprising the aforementioned individual battery cells.

[0007] To achieve the first objective described above, the battery casing of the present invention includes: A first housing, the first housing including a bottom and a first sidewall, the first sidewall extending upward from the bottom, the first sidewall enclosing an opening, and an end of the first sidewall forming a first flange coplanar with the first sidewall; and A second housing includes a top and a second flange, the top for covering the opening, the second flange extending downward from the top, the second housing covering the first flange, and the first flange being welded to the second flange.

[0008] Preferably, the first housing and / or the second housing are alloy structures.

[0009] Preferably, the top and the second flange form a limiting step, and the first flange is disposed on the limiting step.

[0010] Preferably, the first flange fits against the top, and the first flange and the second flange are installed with a gap between them.

[0011] Preferably, the end of the second flange is bent outward.

[0012] Preferably, a fusion-bonded region is formed between the first flange and the second flange, the fusion-bonded region passing through the end of the first flange, or the fusion-bonded region passing through the end of the second flange, or the fusion-bonded region passing through the middle of both the first flange and the second flange.

[0013] Preferably, the thickness of the first housing and the second housing is in the range of 100μm-150μm.

[0014] Preferably, an explosion-proof valve is provided on the outer surface of the top. The explosion-proof valve is a blind groove with a bent shape. In the thickness direction of the second housing, the depth of the explosion-proof valve is less than the thickness of the second housing. The first housing is provided with a pole, an injection port and a sealing pin. The pole is insulated from the first housing and the sealing pin seals the injection port.

[0015] To achieve the second objective mentioned above, the present invention also provides a single battery cell, which includes a cell and the aforementioned battery casing, wherein the cell is housed within the battery casing, and the first flange and the second flange are welded together.

[0016] To achieve the third objective mentioned above, the present invention also provides a battery pack comprising the aforementioned individual battery cells. Attached Figure Description

[0017] Figure 1 This is a perspective view of the battery casing of the present invention.

[0018] Figure 2 This is a front view of the battery casing of the present invention.

[0019] Figure 3 This is a top view of the battery casing of the present invention.

[0020] Figure 4 The battery casing of the present invention is along Figure 3 The sectional view obtained after cutting along line segment AA.

[0021] Figure 5 The battery casing of the present invention is along Figure 2 The sectional view obtained after cutting the middle BB line segment.

[0022] Figure 6 yes Figure 4 The diagram shows a partial cross-sectional view of the structure, where the fused bonding zone passes through the end of the second flange.

[0023] Figure 7 yes Figure 4 The diagram shows a partial cross-sectional view of the structure, where the fused bonding zone passes through the end of the first flange.

[0024] Figure 8 yes Figure 4 The partial cross-sectional view of the structure shown shows that the fused joint zone passes through the ends of both the first and second flanges.

[0025] Figure 9 This is a perspective view of the battery of the present invention when it is separated from the second casing. Detailed Implementation

[0026] To illustrate the technical content and structural features of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0027] like Figures 1 to 8 As shown, the present invention provides a battery housing 100 for a single battery cell, including a first housing 10 and a second housing 20. The first housing 10 includes a bottom 11 and a first sidewall 12. The first sidewall 12 extends upward from the bottom 11, forming an opening 13, and the ends of the first sidewall 12 are located on a first flange 121 in the same plane. The second housing 20 includes a top 21 and a second flange 22. The top 21 covers the opening 13, and the second flange 22 extends downward from the top 21, covering the first flange 121. The first flange 121 and the second flange 22 are welded together.

[0028] In this invention, a second flange 22 extends downward from the top 21, and the second housing 20 covers the first flange 121. After the first housing 10 and the second housing 20 are assembled, they mutually position and limit each other, preventing displacement or misalignment. This simplifies the difficulty of positioning using jigs during assembly, simplifying the operation and eliminating the need for jigs for positioning. Furthermore, the structural solution of this invention can change the welding method in existing products, forming a fusion bonding zone different from existing products, allowing for a reduction in the wall thickness of the first housing 10 and the second housing 20. The aforementioned fusion welding refers to welding using a penetration welding method.

[0029] like Figures 1 to 8 As shown in the embodiments provided by the present invention, the first housing 10 and the second housing 20 are selected as alloy structures, such as stainless steel, nickel alloy, aluminum alloy, etc. The alloy structure housing can protect the internal battery cell, prevent moisture intrusion, and protect the internal battery cell in the event of a drop. Preferably, the first housing 10 and the second housing 20 are respectively constructed as stamped parts to ensure the structural rigidity of the first housing 10 and the second housing 20.

[0030] like Figures 1 to 8 As shown, the top 21 and the second flange 22 form a limiting step 23, and the first flange 121 and the second flange 22 are installed with a gap between them. There is still a small amount of movable space between the first flange 121 and the second flange 22 to facilitate assembly. Furthermore, the end of the second flange 22 is bent outward, as... Figure 4 As shown, an R-angle is formed, which is equivalent to increasing the opening diameter, making the assembly of the first housing 10 and the second housing 20 easier. Preferably, the end of the second flange 22 is slightly bent outward, and the bending angle is not large, so it will not affect the positioning function. The second flange 22 and the first flange 121 form an assembly guide, making the assembly of the two easier. The end of the first flange 121 is in close contact with the top 21.

[0031] A fusion bonding region 24 is formed between the first flange 121 and the second flange 22, and the fusion bonding region 24 passes through the end of the first flange 121. Figure 7 As shown in the diagram. Alternatively, the fusion bonding region 24 extends past the end of the second flange 22, as in this case... Figure 6 As shown in the diagram. Alternatively, the fusion bonding region 24 passes through the middle of both the first flange 121 and the second flange 22, as in this case... Figure 8 As shown in the diagram. By adopting this structure and positioning method, the welding position can be changed to form a fusion bonding area 24 that is different from existing products. The first shell 10 and the second shell 20 can be effectively thinned and the weight can be effectively reduced by 25-60%. After the first shell 10 and the second shell 20 are thinned, the inner cavity of the battery shell 100 becomes larger, thereby effectively increasing the cell capacity.

[0032] Preferably, the welding sealing method of the present invention adopts a through-welding method, in which the laser penetrates from the top or side edge of the second flange 22 of the second housing 20, and the fusion connection area 24 falls at the junction of the two, so that the first flange 121 and the second flange 22 are fused and sealed. The fusion connection area 24 continuously seals the opening 13. The first flange 121 and the second flange 22 form the fusion connection area 24 by welding, which can firmly weld the first flange 121 and the second flange 22 together, thereby making it less likely for the first housing 10 and the second housing 20 to separate accidentally, improving the reliability of the cell packaging. Moreover, the fusion connection area 24 continuously surrounds the internal space of the cell, which can effectively seal the internal space of the cell and prevent external moisture from entering the cell, thus improving the reliability of the cell packaging from another aspect.

[0033] In the embodiments provided by this invention, the thickness of the first housing 10 and the second housing 20 ranges from 100μm to 150μm. The solution of this invention can effectively reduce the thickness of the first housing 10 and the second housing 20. The materials of the first housing 10 and the second housing 20 are alloys, which have strong hardness and ductility. Therefore, a thickness of 100μm-150μm is sufficient to meet the cell packaging requirements, resulting in a high volumetric energy density of the battery.

[0034] like Figure 3 and Figure 4 As shown, an explosion-proof valve 25 is provided on the outer surface of the top 21 of the second housing 20. The explosion-proof valve 25 is a curved groove, more specifically, an arc-shaped blind groove. The depth of the explosion-proof valve 25 is less than the thickness of the second housing 20 in the thickness direction. The explosion-proof valve 25 is used to release the internal pressure of the battery cell when the pressure inside the battery cell rises to a threshold, thereby preventing the battery cell from exploding. The explosion-proof valve 25 is located on the top 21 and not on the second flange 22, allowing the explosion-proof valve 25 to function properly. It is understood that in other embodiments, the explosion-proof valve 25 can be located on the bottom 11 of the first housing 10.

[0035] The groove of the explosion-proof valve 25 can be formed by a grooving process, such as etching or mechanical engraving. In this invention, the explosion-proof valve 25 is located near a corner of the second housing 20. When the pressure inside the battery cell reaches a set threshold, it can rupture from the corner, thereby better fulfilling its explosion-proof function.

[0036] like Figures 1 to 5 As shown, the first housing 10 is provided with an electrode post 14, a liquid injection port 15, and a sealing pin 16. The electrode post 14 is installed on the first side wall 12 of the first housing 10, specifically by riveting. An insulating component is provided between the electrode post 14 and the first side wall 12 to insulate the electrode post 14. Preferably, the insulating component is made of plastic and is installed on the first side wall 12 by assembly or injection molding. The liquid injection port 15 is located on the first side wall 12, and the sealing pin 16 is welded to the liquid injection port 15. Preferably, the electrode post 14 is made of an alloy material, such as aluminum alloy.

[0037] like Figure 9 As shown, the present invention also provides a single-cell battery 1000, which includes the aforementioned battery casing 100 and battery cell 200. An internal space is provided within the battery casing 100, and the battery cell 200 is housed within the battery casing 100, i.e., installed within this internal space. The first flange 121 and the second flange 22 are welded together. This is in the embodiment provided by the present invention. Additionally, the present invention also provides a battery pack including the aforementioned single-cell battery. The aforementioned battery cell 200 adopts a stacked or wound cell structure.

[0038] exist Figure 1 , Figure 2 and Figure 4 In the diagram, arrow X points to the left and right direction, arrow Y points to the front and back direction, and arrow Z points to the up and down direction.

[0039] The above-disclosed examples are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are within the scope of the present invention.

Claims

1. A battery casing, characterized in that, include: A first housing, the first housing including a bottom and a first sidewall, the first sidewall extending upward from the bottom, the first sidewall enclosing an opening, and the end of the first sidewall forming a first flange in the same plane as the first sidewall; as well as A second housing includes a top and a second flange, the top for covering the opening, the second flange extending downward from the top, the second housing covering the first flange, and the first flange being welded to the second flange.

2. The battery casing according to claim 1, characterized in that, The first housing and / or the second housing are alloy structures.

3. The battery casing according to claim 1, characterized in that, The top and the second flange form a limiting step, and the first flange is located on the limiting step.

4. The battery casing according to claim 3, characterized in that, The first flange fits against the top, and the first flange and the second flange are installed with a gap between them.

5. The battery casing according to claim 1, characterized in that, The end of the second flange is bent outward.

6. The battery casing according to claim 1, characterized in that, A fusion-bonded region is formed between the first flange and the second flange. The fusion-bonded region passes through the end of the first flange, or the end of the second flange, or the fusion-bonded region passes through the middle of both the first flange and the second flange.

7. The battery casing according to claim 1, characterized in that, The thickness of the first housing and the second housing ranges from 100μm to 150μm.

8. The battery casing according to claim 1, characterized in that, An explosion-proof valve is provided on the outer surface of the top. The explosion-proof valve is a blind groove with a bent shape. In the thickness direction of the second housing, the depth of the explosion-proof valve is less than the thickness of the second housing. The first housing is provided with a pole, an injection port and a sealing pin. The pole is insulated from the first housing and the sealing pin seals the injection port.

9. A single-cell battery, characterized in that, The battery includes a battery cell and a battery housing as described in any one of claims 1-8, wherein the battery cell is housed within the battery housing, and the first flange and the second flange are welded together.

10. A battery pack, characterized in that, Including the single cell according to claim 9.

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