Battery shell and battery

Abstract

The battery shell comprises a shell body and a cover plate, the interior of the shell body is used for accommodating a battery cell, the shell body is provided with at least one opening end, a peripheral flange is formed outside the opening end, the peripheral flange protrudes outwards relative to the outer wall of the shell body, and a step groove is formed inside the peripheral flange; the cover plate is located in the step groove, seals the opening end and is welded to the peripheral flange. The utility model also discloses a battery. According to the utility model, the convenience of the welding operation of the cover plate and the shell is effectively improved, and the sealing performance and the strength of the shell are greatly improved at the same time.

Description

Technical Field

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

[0002] Lithium batteries offer advantages such as high energy density and long cycle life. As an efficient and environmentally friendly energy storage technology, they have been widely used in electric vehicles, smartphones, aerospace, medical devices, and other fields. Existing lithium batteries generally consist of a housing and a cover plate, which is connected to the housing opening to seal the housing. However, the housing and cover plate often have poor sealing properties, making them prone to leakage. Furthermore, the housing's low strength does not provide adequate protection for the internal cells, thus affecting battery performance and increasing safety risks, making it impossible to meet production and user requirements. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is to improve the sealing performance and strength of the battery housing in the prior art.

[0004] In order to solve the above technical problems, the utility model provides a battery case, comprising:

[0005] A housing for accommodating a battery cell, the housing having at least one open end, each of the open ends having a peripheral flange formed outside thereof, the peripheral flange protruding outward relative to an outer wall of the housing, and a step groove formed inside the peripheral flange;

[0006] A cover plate is located in the step groove and closes the open end, and the cover plate and the peripheral flange are welded.

[0007] In one embodiment of the present invention, the top surface of the cover plate is flush with the top surface of the peripheral flange.

[0008] In one embodiment of the present invention, both ends of the shell are provided with open ends, and the cover plate is provided at each of the open ends.

[0009] In one embodiment of the present invention, the length of the peripheral flange protruding outward relative to the outer wall of the shell is no more than 1 mm.

[0010] In one embodiment of the present invention, at least one of the cover plates is provided with an explosion-proof valve.

[0011] In one embodiment of the present invention, the battery shell further comprises a positive electrode member and a negative electrode member, the shell is a conductive element, the positive electrode member is connected to the shell by heat-melting through an insulating sheet, and the negative electrode member is welded to the outer wall of the shell.

[0012] In one embodiment of the present invention, a mounting hole is provided on the shell, and the positive electrode member includes a column portion, and the column portion passes through the insulating sheet and extends into the mounting hole.

[0013] In one embodiment of the present invention, the battery shell further comprises a liquid blocking plug, the shell is provided with a liquid injection hole, and the liquid blocking plug is connected to the shell and blocks the liquid injection hole.

[0014] In one embodiment of the present invention, the liquid blocking plug is connected to the housing via a gasket.

[0015] The utility model also discloses a battery, comprising the battery shell described in any one of the above items, wherein a battery core is arranged inside the shell.

[0016] The above technical solution of the utility model has the following advantages compared with the prior art:

[0017] The battery case and battery described in the utility model effectively improve the convenience of welding operations between the cover plate and the shell, and also greatly improve the sealing of the shell, making it less likely for electrolyte leakage to occur, and effectively improving the strength of the battery and the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0019] Figure 1 It is a structural schematic diagram of the battery of the present utility model;

[0020] Figure 2 yes Figure 1 A schematic structural diagram of the battery from another angle;

[0021] Figure 3 yes Figure 1 a side view of the battery shown;

[0022] Figure 4 yes Figure 3 a right side view of the battery shown;

[0023] Figure 5 yes Figure 4 Cross-sectional view at AA in the middle;

[0024] Figure 6 yes Figure 5 A partial enlarged view of the M in the middle;

[0025] Figure 7 It is a structural diagram of the housing in the utility model;

[0026] Figure 8yes Figure 7 A local enlarged view of point N in the middle;

[0027] Figure 9 yes Figure 1 An exploded view of the battery structure shown;

[0028] Description of the accompanying drawings:

[0029] 10. Housing; 101. Open end; 102. Peripheral flange; 1021. Step groove; 103. Mounting hole; 104. Liquid injection hole;

[0030] 20. Cover plate;

[0031] 30. Positive electrode component; 301. Column portion; 40. Insulating sheet; 50. Negative electrode component; 60. Liquid blocking plug; 70. Gasket; 80. Battery cell. DETAILED DESCRIPTION

[0032] The present invention is further described below with reference to the accompanying drawings and specific embodiments to enable those skilled in the art to better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention. It is apparent that the embodiments described are only some of the embodiments of the present disclosure, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present disclosure, its application, or use.

[0033] In the description of the present invention, it should be understood that the terms "vertical", "upper", "lower", "top", "side", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0035] The following will be combined Figures 1-9 , the structure of this embodiment is further described.

[0036] Example

[0037] See Figures 1-6 This embodiment discloses a battery case, including a shell 10 and a cover plate 20. The shell 10 is used to accommodate a battery cell 80. The shell 10 has at least one open end 101. The open end 101 has an opening for receiving the battery cell 80. The open end 101 is formed with a peripheral flange 102 on the outside. The peripheral flange 102 protrudes outward relative to the outer wall of the shell 10.

[0038] like Figure 5-Figure 8 As shown, a step groove 1021 is formed inside the peripheral flange 102;

[0039] The cover plate 20 is located in the step groove 1021 and closes the open end 101 . The cover plate 20 and the peripheral flange 102 are welded together.

[0040] The above structure is provided with an outer flange 102 and the cover plate 20 is placed in the step groove 1021 and then welded together, which effectively improves the convenience of the welding operation and is more conducive to the assembly and positioning of the cover plate 20. At the same time, it also greatly improves the sealing of the cover plate 20 to the shell 10; in addition, the setting of the outer flange 102 also increases the strength of the shell 10, thereby improving the overall strength of the battery. The outer flange 102 plays a supporting and protective role. When the battery shell accidentally falls, the outer flange 102 can play a certain supporting and vibration-reducing role, thereby reducing the deformation and damage of the internal battery cell 80 due to extrusion.

[0041] Furthermore, the peripheral flange 102 may be formed by folding or by other methods.

[0042] The cover plate 20 and the peripheral flange 102 may be welded by penetration welding.

[0043] In some embodiments, the top surface of the cover plate 20 is flush with the top surface of the peripheral flange 102 to facilitate welding operations and improve the sealing effect.

[0044] In some embodiments, the open end 101 may be provided at only one end of the housing 10 .

[0045] In other ways, such as Figure 7 As shown, open ends 101 may be provided at both ends of the shell 10 , and a cover plate 20 is correspondingly provided at each open end 101 , and each cover plate 20 is provided in a step groove 1021 corresponding to the peripheral flange 102 .

[0046] Furthermore, if Figure 6 As shown, the outer flange 102 protrudes outward from the outer wall of the housing 10 by a length L of no more than 1 mm. If the protrusion length is too long, the overall battery housing will occupy too much space, which is not conducive to meeting the design requirements of "miniaturization". If the protrusion length is too short, the welding reliability of the cover plate 20 will be reduced, and the defect rate will increase.

[0047] In some embodiments, an explosion-proof valve may be provided on at least one cover plate 20 to relieve pressure when the pressure inside the housing 10 is too high.

[0048] The battery shell also includes a positive electrode component 30 and a negative electrode component 50. The shell 10 is a conductive element. The positive electrode component 30 is hot-melt connected to the shell 10 through the insulating sheet 40, so that the positive electrode component 30 is bonded to the shell 10 through the insulating sheet 40, and the negative electrode component 50 is welded to the outer wall of the shell 10.

[0049] The shell 10 and the negative electrode sheet are used as a whole as a negative electrode, and the positive electrode sheet and the shell 10 are insulated and isolated by the insulating sheet 40.

[0050] The shell can be made of stainless steel.

[0051] The insulating sheet 40 may be an insulator made of non-metallic materials. To further ensure the hot-melt effect, the insulating sheet 40 may be made of polypropylene material (PP plastic).

[0052] The positive electrode component 30 is connected to the shell 10 by hot-melt connection through the insulating sheet 40, which simplifies the battery assembly process and makes the battery structure simpler. On the other hand, it can also effectively avoid the gap between the positive electrode component 30, the insulating sheet 40 and the shell body, thereby effectively improving the sealing performance of the entire shell 10.

[0053] The negative electrode member 50 may be made of nickel, and the positive electrode member 30 may be made of aluminum.

[0054] In some embodiments, as Figure 9 As shown, a mounting hole 103 is provided on the housing 10 , and the positive electrode member 30 includes a column portion 301 , which passes through the insulating sheet 40 and extends into the mounting hole 103 to facilitate electrical connection with the positive electrode of the battery cell 80 .

[0055] In some embodiments, the battery case further includes a liquid blocking plug 60 . The shell 10 is provided with a liquid injection hole 104 to facilitate injection of electrolyte into the shell 10 . The liquid blocking plug 60 is connected to the shell 10 and blocks the liquid injection hole 104 .

[0056] Furthermore, the liquid blocking plug 60 is connected to the shell 10 through a gasket 70; for example, the liquid blocking plug 60 and the gasket 70 are both made of steel. After the electrolyte is injected into the shell 10, the liquid blocking plug 60 can be welded to the shell 10 through the gasket 70.

[0057] In some embodiments, the cover plate 20 and the peripheral flange 102 are both made of stainless steel.

[0058] In some embodiments, the wall thickness of the housing 10 is 30 um to 200 um.

[0059] like Figure 5 and Figure 9 As shown, this embodiment further discloses a battery, including the above-mentioned battery shell, wherein a battery cell 80 is arranged inside the shell 10.

[0060] The positive electrode of the battery cell 80 is electrically connected to the positive electrode member 30 , and the negative electrode of the battery cell 80 is electrically connected to the negative electrode member 50 .

[0061] Furthermore, the battery cell 80 is rectangular, which is more conducive to heat dissipation and has a higher energy density.

[0062] Preferably, the housing 10 is also rectangular.

[0063] The battery of the above embodiment can effectively improve the convenience of welding operation between the cover plate and the shell by setting the outer flange on the shell, and at the same time greatly improve the sealing of the cover plate to the shell, making it less likely to cause electrolyte leakage, effectively improving the safety of battery use, and also providing good protection for the battery cell.

[0064] All of the above optional technical solutions can be combined in any way to form optional embodiments of the present invention, that is, any multiple embodiments can be combined to meet the needs of different application scenarios. They are all within the scope of protection of this application and will not be described in detail here.

[0065] It should be noted that the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A battery case, characterized in that: include, A housing for accommodating a battery cell, the housing having at least one open end, each of the open ends having a peripheral flange formed outside thereof, the peripheral flange protruding outward relative to an outer wall of the housing, and a step groove formed inside the peripheral flange; a cover plate, the cover plate being located in the step groove and closing the open end, the cover plate being welded to the peripheral flange; The top surface of the cover plate is flush with the top surface of the peripheral flange.

2. The battery case according to claim 1, wherein: Both ends of the shell are provided with open ends, and the cover plate is provided at each of the open ends.

3. The battery case according to claim 1, wherein: The length of the peripheral flange protruding outward relative to the outer wall of the shell is no more than 1 mm.

4. The battery case according to claim 1, wherein: At least one of the cover plates is provided with an explosion-proof valve.

5. The battery case according to claim 1, wherein: It also includes a positive electrode and a negative electrode. The shell is a conductive element. The positive electrode is connected to the shell through thermal melting of an insulating sheet, and the negative electrode is welded to the outer wall of the shell.

6. The battery case according to claim 5, wherein: The shell is provided with a mounting hole, and the positive electrode member includes a column portion, and the column portion passes through the insulating sheet and extends into the mounting hole.

7. The battery case according to claim 1, wherein: It also includes a liquid blocking plug. The shell is provided with a liquid injection hole. The liquid blocking plug is connected to the shell and blocks the liquid injection hole.

8. The battery case according to claim 7, wherein: The liquid blocking plug is connected to the shell through a gasket.

9. A battery, characterized in that: The battery shell comprises the battery shell according to any one of claims 1 to 8, wherein a battery cell is arranged inside the shell.

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