Battery shell and battery structure

Abstract

The utility model discloses a battery case and a battery structure, and relates to the technical field of batteries, the battery case comprises a case body and a top cover, and an accommodating cavity for accommodating a battery cell is arranged in the case body. The top cover is connected with one opening end of the shell, a sinking groove is formed in the side, back on to the containing cavity, of the top cover, and a flange protruding towards the containing cavity is arranged on the side, facing the containing cavity, of the top cover. The accommodating cavity arranged in the battery case provided by the utility model can be used for loading the battery cell to form the battery, the top cover of the battery case is provided with the sinking groove and the flange, and the flange faces the accommodating cavity. According to the top cover of the battery case, the current collecting plate of the battery cell in the accommodating cavity can be connected with the flange, the current collecting plate can be connected with the flange through penetration welding no matter the current collecting plate is planar, convex or concave, and compared with the prior art that the top cover of the battery case is planar, the top cover of the battery case is provided with the flange and the sinking groove, so that the mounting compatibility of the current collecting plate of the battery cell is obviously improved.

Description

Technical Field

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

[0002] At present, lithium-ion batteries are not only widely used in 3C fields such as mobile phones, digital cameras and PCs, but also in power tools and other fields. With the rapid development of new energy vehicles, lithium-ion batteries, as the main power source of new energy vehicles, have also ushered in opportunities for vigorous development. At present, the main shapes of power batteries include large cylindrical, soft pack and square, among which large cylindrical batteries are more commonly used.

[0003] The prior art with announcement number CN219779157U discloses a cylindrical battery, including a battery cell, the battery cell including a battery cell body, a first pole ear and a second pole ear, the first pole ear and the second pole ear extending from the same end of the battery cell body, and the conductivity of the first pole ear is greater than the conductivity of the second pole ear; a battery shell, the battery cell is arranged in the battery shell, the first pole ear is electrically connected to the battery shell by welding, so as to form a first weld mark area on the first pole ear; a pole assembly, the pole assembly is arranged on the battery shell, and the second pole ear is electrically connected to the pole assembly by welding, so as to form a second weld mark area on the second pole ear; wherein the area of ​​the second weld mark area is greater than the area of ​​the first weld mark area, so that the current carrying capacity of the first pole ear and the second pole ear can be basically consistent, thereby effectively improving the safe use performance of the cylindrical battery.

[0004] However, the existing cylindrical battery still has defects. For example, the welding area at the bottom of the battery shell is flat, and the welding area is welded to the internal battery collector plate by penetration welding, which cannot meet the requirements of welding collector plates of different sizes and shapes. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned technical deficiencies and propose a battery shell and a battery structure to solve the technical problem that in the prior art, the bottom welding area of ​​the battery shell is flat and the welding area is welded to the internal battery collector by penetration welding, which cannot meet the welding requirements of collectors of different sizes and shapes.

[0006] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0007] In a first aspect, the utility model provides a battery case, comprising:

[0008] A housing having a receiving cavity for receiving the battery cell; and

[0009] A top cover is connected to one end of the shell, a side of the top cover facing away from the accommodating cavity is provided with a sinking groove, and a side of the top cover facing the accommodating cavity is provided with a flange protruding toward the accommodating cavity, and the flange overlaps with at least a portion of the sinking groove.

[0010] In some embodiments, the angle formed by the bottom of the sink trough and the trough wall is an obtuse angle, the angle formed by the side wall of the flange and the surface of the top cover is an obtuse angle, and the angles of the two obtuse angles are consistent.

[0011] In some embodiments, the sink groove and the flange are both circular in shape, the shell is cylindrical, and the center of the sink groove and the center of the flange are both located on the central axis of the shell.

[0012] In some embodiments, the flange and the top cover are an integrally formed structure.

[0013] In some embodiments, the surface of the sink and the surface of the flange are both rough surfaces.

[0014] In some embodiments, the battery case further includes a bottom cover connected to an end of the housing away from the top cover.

[0015] In some embodiments, a side of the bottom cover facing away from the accommodating cavity is provided with a sinking groove, and a side of the bottom cover facing the accommodating cavity is provided with a flange protruding toward the accommodating cavity.

[0016] In a second aspect, the utility model further provides a battery structure, comprising a battery cell and the above-mentioned battery shell, wherein the battery cell is arranged in the accommodating cavity, and the current collecting plate of the battery cell abuts against the flange.

[0017] In some embodiments, the current collecting plate of the battery cell has a groove, and the groove is snap-fitted with the flange.

[0018] In some embodiments, the current collecting disk of the battery cell has an elastic protrusion, and the elastic protrusion elastically abuts against the flange.

[0019] Compared with the prior art, the accommodating cavity provided in the battery shell provided by the utility model can be used to load the battery cell to form a battery, and the top cover of the battery shell has a sinking groove and a flange, and the flange faces the accommodating cavity. The current collecting disk of the battery cell in the accommodating cavity can be connected to the flange, and no matter whether the current collecting disk is planar, convex or concave, it can be connected to the flange by penetration welding. Compared with the prior art in which the top cover of the battery shell is planar, the top cover of the battery shell of the present application significantly improves the compatibility of the installation of the battery cell current collecting disk by setting the flange and the sinking groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a schematic diagram of the battery shell structure provided by an embodiment of the utility model;

[0021] Figure 2 It is a schematic cross-sectional view of a battery shell provided by an embodiment of the utility model;

[0022] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in FIG.

[0023] Figure 4 It is a structural schematic diagram of a battery structure provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0025] In order to solve the technical problem in the prior art that the welding area at the bottom of the battery shell is a plane, and the welding area is welded to the internal battery collector plate by penetration welding, which cannot meet the welding requirements of collector plates of different sizes and shapes, the utility model provides a battery shell that can be connected to collector plates of different shapes by penetration welding and has strong compatibility.

[0026] It should be noted that the battery shell described in the present invention is used for but not limited to battery structures, etc. For the convenience of explanation, in the present invention, only the battery shell applied to the battery structure is used as an example for explanation, and the principle of using the battery shell in other types of equipment is essentially the same as the principle applied to the battery structure, which will not be repeated here.

[0027] See also Figure 1 , Figure 1The schematic diagram of the structure of the battery shell 100 in one embodiment of the utility model is shown in FIG. 1 . The battery shell 100 includes a shell 1 and a top cover 2. The shell 1 is provided with a receiving cavity 11 for receiving the battery cell, and the shell 1 is hollow with two ends open. The top cover 2 is connected to one of the open ends of the shell 1. The side of the top cover 2 facing away from the receiving cavity 11 is provided with a sinking groove 21. The side of the top cover 2 facing the receiving cavity 11 is provided with a flange 22 protruding toward the receiving cavity 11. It can be understood that the flange 22 is located inside the receiving cavity 11, and the sinking groove 21 is located outside the receiving cavity 11. The flange 22 overlaps with at least a portion of the sinking groove 21. It can be understood that the projection of the flange 22 on the sinking groove 21, at least a portion of the projection is located inside the sinking groove 21. The most ideal state is that the projection completely overlaps with the sinking groove 21. During the welding process, the flange 22 is welded to the current collecting plate of the battery cell by laser penetration welding. The laser directly hits the flange 22 after penetrating the sinking groove 21, so the flange 22 and the sinking groove 21 cannot be completely misaligned, otherwise the laser will not be able to directly hit the flange 22 after penetrating the sinking groove 21.

[0028] In one embodiment, see Figure 2 and Figure 3 The angle formed by the bottom of the sink 21 and the wall is an obtuse angle, and the angle formed by the side wall of the flange 22 and the surface of the top cover 2 is an obtuse angle, and the two obtuse angles are consistent, making the processing and mold opening more convenient and saving costs. In other embodiments, the angle is still a right angle or an acute angle, which is not limited here.

[0029] In some embodiments, the shapes of the sinking groove 21 and the flange 22 are both circular, the shell 1 is cylindrical, and the center of the sinking groove 21 and the center of the flange 22 are both located on the central axis of the shell 1. In this embodiment, the overlapping area of ​​the sinking groove 21 and the flange 22 is large. When performing penetration welding, a laser is used to emit laser to penetrate the sinking groove 21 and penetrate the flange 22. The laser can more easily penetrate the flange 22 and contact the collector plate. Compared with the embodiment in which the sinking groove 21 and the flange 22 are more misaligned, this embodiment is more convenient when performing penetration welding, and when most battery cells are installed in the accommodating cavity 11, the collector plates of the battery cells can be connected to the flange 22.

[0030] In one embodiment, see Figure 2 The flange 22 and the top cover 2 are an integrally formed structure, so that the flange 22 and the top cover 2 are stably connected.

[0031] In one embodiment, see Figure 3The surface of the sink 21 and the surface of the flange 22 are both rough surfaces 23. The top cover 2 and the flange 22 are made of metal materials, such as aluminum. The surface of the sink 21 and the surface of the flange 22 are roughened to reduce the reflection of the laser on the metal surface during the welding process, thereby improving the stability and qualified rate of welding. There are many ways of roughening, such as frosting, sandpaper polishing, sandblasting or chemical etching.

[0032] In one embodiment, see Figure 2 The battery case 100 further includes a bottom cover 3, which is connected to the end of the shell 1 away from the top cover 2 to encapsulate the battery cell in the accommodating cavity 11. The connection method between the bottom cover 3 and the shell 1 is not limited, for example, it can be welded or detachably connected, the detachable connection includes a threaded connection or a clamping connection, etc., and the welding can connect the bottom cover 3 and the shell 1 by peripheral welding.

[0033] In one of the embodiments, a sinking groove (not shown in the figure) is provided on the side of the bottom cover 3 facing away from the accommodating cavity 11, and a flange (not shown in the figure) protruding toward the accommodating cavity 11 is provided on the side of the bottom cover 3 facing the accommodating cavity 11. In this embodiment, the bottom cover 3 and the top cover 2 described above have the same structure, so that when the battery cell is installed in the accommodating cavity 11, it is not necessary to distinguish the ends of the shell 1, and the connection between the battery cell and the top cover 2 or the bottom cover 3 can be achieved by welding, which is conducive to improving work efficiency.

[0034] Second, see Figure 4 The utility model further provides a battery structure 101 including a battery cell 4 and the above-mentioned battery shell 100 , wherein the battery cell 4 is disposed in the accommodating cavity 11 of the battery shell 100 , and the current collecting plate 41 of the battery cell 4 abuts against the flange 22 of the battery shell 100 .

[0035] In one of the embodiments, the current collecting plate 41 of the battery cell 4 has a groove (not shown in the figure), and the groove is snap-fitted with the flange 22 so that the current collecting plate 41 and the flange 22 are stably connected.

[0036] In another embodiment, the current collecting plate 41 of the battery cell 4 has an elastic protrusion (not shown in the figure), which elastically abuts against the flange 22 so that the current collecting plate 41 can be stably connected to the flange 22, which is beneficial to subsequent penetration welding.

[0037] In order to better understand the present invention, the following Figures 1 to 4 The technical solution of the utility model is described in detail:

[0038] The accommodating cavity 11 provided in the battery shell 100 provided by the utility model can be used to load the battery cell 4 to form a battery structure 101. The top cover 2 of the battery shell 100 has a sinking groove 21 and a flange 22, and the flange 22 faces the accommodating cavity 11. The current collecting disk 41 of the battery cell 4 in the accommodating cavity 11 can be connected with the flange 22. Regardless of whether the current collecting disk 41 is planar, convex or concave, it can be connected with the flange 22 by penetration welding. Compared with the prior art in which the battery shell top cover 2 is planar, the battery shell top cover 2 of the present application is provided with the flange 22 and the sinking groove 21, which significantly improves the compatibility of the installation of the battery cell current collecting disk 41.

[0039] The specific implementation methods of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A battery case, characterized in that: include: A housing having a receiving cavity for receiving the battery cell; and A top cover is connected to one end of the shell, a side of the top cover facing away from the accommodating cavity is provided with a sinking groove, and a side of the top cover facing the accommodating cavity is provided with a flange protruding toward the accommodating cavity, and the flange overlaps with at least a portion of the sinking groove.

2. The battery case according to claim 1, characterized in that: The angle formed by the bottom of the sinking groove and the groove wall is an obtuse angle, the angle formed by the side wall of the flange and the surface of the top cover is an obtuse angle, and the angles of the two obtuse angles are consistent.

3. The battery case according to claim 1, characterized in that: The sinking groove and the flange are both circular in shape, the shell is cylindrical, and the center of the sinking groove and the center of the flange are both located on the central axis of the shell.

4. The battery case according to claim 1, characterized in that: The flange and the top cover are an integrally formed structure.

5. The battery case according to claim 1, characterized in that: The surface of the sinking groove and the surface of the flange are both rough surfaces.

6. The battery case according to claim 1, characterized in that: The battery case further includes a bottom cover connected to an end of the housing away from the top cover.

7. The battery case according to claim 6, characterized in that: A sinking groove is formed on a side of the bottom cover facing away from the accommodating cavity, and a flange protruding toward the accommodating cavity is formed on a side of the bottom cover facing the accommodating cavity.

8. A battery structure, characterized in that: It comprises a battery cell and a battery shell as described in any one of claims 1 to 7, wherein the battery cell is arranged in the accommodating cavity, and the current collecting plate of the battery cell abuts against the flange.

9. The battery structure according to claim 8, characterized in that: The current collecting plate of the battery cell has a groove, and the groove is snap-fitted with the flange.

10. The battery structure according to claim 8, characterized in that: The current collecting disk of the battery cell has an elastic protrusion, and the elastic protrusion elastically abuts against the flange.

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