Battery shell, battery and electric equipment
By setting a matching flange structure on the top cover and housing of the battery case, the problem of welding light leakage during battery assembly is solved, and effective protection of the battery cell and improvement of welding quality is achieved.
Patent Information
- Application Number
- CN202421264784.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-06-04
AI Technical Summary
During the battery assembly process, laser welding between the top cover and the shell is prone to light leakage, resulting in welding slag sputtering into the shell, resulting in poor assembly, poor cell sealing and even laser damage to the battery cell.
A battery housing is designed, including a top cover and a housing, with a first flange arranged in the circumferential direction, and a second flange is arranged in the circumferential direction, the first flange cooperates with the second flange, and in the direction of the center of the top cover toward the edge, the first flange is located outside the second flange to prevent light leakage during welding.
It effectively prevents light leakage during welding, avoids welding slag sputtering into the shell, ensures the sealing of the battery cell and welding quality, and protects the battery cell.
Smart Images
Figure CN222813730U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a battery casing, a battery and an electrical device. Background Art
[0002] At present, with the development of the lithium battery industry, the increase in battery energy density has made the proportion of battery cells in the battery increasingly larger, so the structure of other accessories in the battery has gradually been simplified or disappeared.
[0003] During the battery assembly process, the top cover and the shell are usually laser welded. However, the current shell and top cover structure is prone to light leakage during the laser welding process. The laser or molten welding slag may splash into the inside of the shell, causing poor assembly, poor sealing of the battery cell, and even laser damage to the battery cell. Utility Model Content
[0004] The purpose of the present application includes, for example, providing a battery casing, a battery and an electrical device, which are not prone to light leakage during the welding process, thereby playing a role in protecting the battery core.
[0005] This application can be implemented as follows:
[0006] The present application provides a battery casing, which includes a top cover and a shell, the shell having a accommodating cavity with an opening at one end, the top cover and the shell being connected to close the opening, the top cover being circumferentially provided with a first flange, the first flange facing the shell, the shell being circumferentially provided with a second flange, the second flange facing the top cover, the first flange matching with the second flange, and the first flange being located on the outside of the second flange in a direction from the center of the top cover toward the edge.
[0007] Optionally, the first flange has a first inclined surface, the second flange has a second inclined surface, and the first inclined surface and the second inclined surface are fitted and welded.
[0008] Optionally, the angle α between the first inclined plane and the horizontal plane and the angle β between the second inclined plane and the horizontal plane are both 30°-60°.
[0009] Optionally, the first flange has a first side surface, the first side surface is away from the first inclined surface, and the first side surface is flush with the side surface of the top cover, and the second flange has a second side surface, the second side surface is away from the second inclined surface, and the second side surface is flush with the inner side surface of the shell.
[0010] Optionally, the first flange is continuously arranged along the circumference of the top cover, and the second flange is continuously arranged along the circumference of the shell.
[0011] Optionally, the shell includes a bottom wall and a side wall connected to each other, the second flange has a top surface and a bottom surface opposite to each other in its height direction, and the width of the top surface, the width of the bottom surface and the thickness of the side wall satisfy: d2 <d1<1 / 2d;
[0012] Wherein, d is the thickness of the side wall, d1 is the width of the top surface, d2 is the difference between the thickness of the side wall and the width of the bottom surface, and the width direction of the second flange is consistent with the thickness direction of the side wall.
[0013] Optionally, the height of the first flange, the height of the second flange and the thickness of the side wall satisfy: h1≤h2≤3 / 4d;
[0014] Among them, h1 is the height of the first flange, h2 is the height of the second flange, d is the thickness of the side wall, and the height direction of the first flange and the height direction of the second flange are both perpendicular to the thickness direction of the side wall.
[0015] Optionally, the height of the first flange is less than or equal to 1.5 mm.
[0016] The present application also provides a battery, comprising the battery casing.
[0017] The present application also provides an electrical device, comprising the battery.
[0018] The battery housing, battery and electrical equipment of the present application have the following beneficial effects, for example: in order to prevent light leakage during welding, a battery housing is designed, the battery housing includes a top cover and a shell, the shell has a receiving cavity with an opening at one end, the top cover and the shell are connected to close the opening, the top cover is provided with a first flange along the circumference, the first flange faces the shell, the shell is provided with a second flange along the circumference, the second flange faces the top cover, the first flange matches with the second flange, and in the direction from the center of the top cover to the edge, the first flange is located on the outside of the second flange. By providing the first flange along the circumference on the top cover, and the second flange along the circumference on the shell, the first flange matches with the second flange, and in the direction from the center of the top cover to the edge, the first flange is located on the outside of the second flange, at this time, light leakage is not likely to occur when the top cover and the shell are welded, and when the battery cell is provided in the receiving cavity, it can also protect the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0020] Figure 1 A schematic diagram of a battery housing in an embodiment of the present application;
[0021] Figure 2 A cross-sectional view of a battery housing in an embodiment of the present application;
[0022] Figure 3 for Figure 2 A magnified view of part A;
[0023] Figure 4 A partial cross-sectional view of the top cover in the embodiment of the present application;
[0024] Figure 5 It is a partial cross-sectional view of the shell in the embodiment of the present application.
[0025] Icon: 1-top cover; 11-first flange; 111-first slope; 112-first side; 2-shell; 21-second flange; 211-second slope; 212-top surface; 213-bottom surface; 214-second side; 22-bottom wall; 23-side wall; 3-accommodating cavity. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0029] In the description of the present application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, it is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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 application.
[0030] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.
[0031] It should be noted that, in the absence of conflict, the features in the embodiments of the present application may be combined with each other.
[0032] The inventor of the present application has found that during the battery assembly process, the top cover and the shell are usually laser welded, and the current shell and top cover structure is prone to light leakage during the laser welding process, and the laser or melted welding slag may splash into the shell, causing poor assembly, poor sealing of the battery cell, and even laser damage to the battery cell. The embodiments of the present application provide a battery shell, which is at least used to solve this technical problem.
[0033] Please refer to Figure 1-Figure 3 The battery housing provided in the embodiment of the present application includes a top cover 1 and a shell 2, the shell 2 has a receiving cavity 3 with an opening at one end, the top cover 1 and the shell 2 are connected to close the opening, the top cover 1 is circumferentially provided with a first flange 11, the first flange 11 faces the shell 2, the shell 2 is circumferentially provided with a second flange 21, the second flange 21 faces the top cover 1, the first flange 11 cooperates with the second flange 21, and in the direction from the center of the top cover 1 toward the edge, the first flange 11 is located on the outside of the second flange 21.
[0034] The shell 2 includes a bottom wall 22 and a side wall 23 connected to each other. The second flange 21 is arranged at one end of the side wall 23 away from the bottom wall 22. When the battery shell is a square or rectangular shell, the number of side walls 23 is four; when the battery shell is a cylindrical shell, the number of side walls 23 is one.
[0035] When the battery casing is a square or rectangular casing, in the cross section parallel to one of the side walls 23 of the shell 2, the shapes of the first flange 11 and the second flange 21 are both right-angled trapezoids; when the battery casing is a cylindrical casing, in the cross section perpendicular to the top cover 1, the shapes of the first flange 11 and the second flange 21 are both right-angled trapezoids.
[0036] A first flange 11 is circumferentially arranged on the top cover 1, and a second flange 21 is circumferentially arranged at one end of the side wall 23 away from the bottom wall 22. The first flange 11 cooperates with the second flange 21, and in the direction from the center of the top cover 1 toward the edge, the first flange 11 is located on the outside of the second flange 21. At this time, light leakage is not likely to occur when welding the top cover 1 and the shell 2, and laser or molten welding slag is not likely to splash into the inside of the shell 2. When the battery cell is arranged in the accommodating cavity 3, it can protect the battery cell.
[0037] Please refer to Figure 4 , Figure 5 In this embodiment, the first flange 11 has a first inclined surface 111 , and the second flange 21 has a second inclined surface 211 . The first inclined surface 111 and the second inclined surface 211 are fitted and welded.
[0038] It should be noted that the first bevel 111 and the second bevel 211 have the same slope, the first bevel 111 and the second bevel 211 are in contact with each other, and the first bevel 111 and the second bevel 211 are welded together. When the first bevel 111 and the second bevel 211 are in contact with each other, the top end of the second flange 21 abuts against the surface of the top cover 1 facing the shell 2. At this time, when the first bevel 111 and the second bevel 211 are welded, the first flange 11 and the second flange 21 can block the laser or the molten welding slag from splashing into the inside of the shell 2, thereby achieving a better sealing effect.
[0039] In this embodiment, the included angle α between the first inclined surface 111 and the horizontal plane and the included angle β between the second inclined surface 211 and the horizontal plane are both 30°-60°.
[0040] Optionally, the angle α between the first inclined plane 111 and the horizontal plane and the angle β between the second inclined plane 211 and the horizontal plane are both 30°, or the angle α between the first inclined plane 111 and the horizontal plane and the angle β between the second inclined plane 211 and the horizontal plane are both 45°, or the angle α between the first inclined plane 111 and the horizontal plane and the angle β between the second inclined plane 211 and the horizontal plane are both 60°.
[0041] It can be understood that the angle α between the first bevel 111 and the horizontal plane and the angle β between the second bevel 211 and the horizontal plane can be selected within the above range. Limiting the angle α between the first bevel 111 and the horizontal plane and the angle β between the second bevel 211 and the horizontal plane to 30°-60° can, on the one hand, facilitate welding of the first bevel 111 and the second bevel 211, and on the other hand, prevent laser or molten welding slag from splashing into the interior of the shell 2 when the first bevel 111 and the second bevel 211 are welded together.
[0042] In this embodiment, the first flange 11 has a first side surface 112, the first side surface 112 faces away from the first inclined surface 111, the first side surface 112 is flush with the side surface of the top cover 1, the second flange 21 has a second side surface 214, the second side surface 214 faces away from the second inclined surface 211, and the second side surface 214 is flush with the inner side surface of the housing 2.
[0043] By making the first side surface 112 flush with the side surface of the top cover 1, there is a better smoothness between the first flange 11 and the side surface of the top cover 1, and the first flange 11 is not likely to interfere with the structures of other devices; by making the second side surface 214 flush with the inner side surface of the housing 2, there is a better smoothness between the second side surface 214 and the inner side surface of the housing 2, and the second flange 21 is not likely to interfere with the battery cells in the accommodation cavity 3.
[0044] In this embodiment, the first flange 11 is continuously arranged along the circumferential direction of the top cover 1, and the second flange 21 is continuously arranged along the circumferential direction of the housing 2.
[0045] When the battery housing is a square or rectangular housing, the top cover 1 is also rectangular, the first flange 11 is continuously arranged along the circumferential direction of the top cover 1, and the second flange 21 is continuously arranged along the tops of the four side walls 23; when the battery housing is a cylindrical housing, the top cover 1 is circular, the first flange 11 is continuously arranged along the circumferential direction of the top cover 1, and the second flange 21 is continuously arranged along the tops of the annular side walls 23.
[0046] When the first flange 11 is continuously arranged along the circumferential direction of the top cover 1, the second flange 21 is continuously arranged along the circumferential direction of the housing 2 and the first flange 11 cooperates with the second flange 21, the first flange 11 and the second flange 21 can block the laser or molten welding slag from splashing into the interior of the housing 2, achieving a better sealing effect.
[0047] In this embodiment, the second flange 21 has opposite top surface 212 and bottom surface 213 in its own height direction, and the following relationship is satisfied among the width of the top surface 212, the width of the bottom surface 213 and the thickness of the side wall 23: d2 < d1 < 1 / 2d; where d is the thickness of the side wall 23, d1 is the width of the top surface 212, d2 is the difference between the thickness of the side wall 23 and the width of the bottom surface 213, and the width direction of the second flange 21 is the same as the thickness direction of the side wall 23.
[0048] By limiting the difference d2 between the thickness of the side wall 23 and the width of the bottom surface 213 to be smaller than the width d1 of the top surface 212, and the width d1 of the top surface 212 to be smaller than half of the thickness d of the side wall 23, the difference d2 between the thickness of the side wall 23 and the width of the bottom surface 213 is smaller. Starting from the outer surface of the side wall 23, the melting depth should exceed the difference d2 between the thickness of the side wall 23 and the width of the bottom surface 213 and should not affect the flatness of the inside of the second flange 21 and cause the second flange 21 to fail in function, thereby preventing the laser melting depth from being too deep and causing penetration of the side wall 23, and protecting the interior of the shell 2 from being affected by laser welding.
[0049] In this embodiment, the height of the first flange 11, the height of the second flange 21 and the thickness of the side wall 23 satisfy: h1≤h2≤3 / 4d; wherein h1 is the height of the first flange 11, h2 is the height of the second flange 21, d is the thickness of the side wall 23, and the height direction of the first flange 11 and the height direction of the second flange 21 are both perpendicular to the thickness direction of the side wall 23.
[0050] In order to make the first flange 11 and the second flange 21 match the size of the side wall 23, by limiting the height h1 of the first flange 11 to be less than or equal to the height h2 of the second flange 21, and the height h2 of the second flange 21 to be less than or equal to 3 / 4 of the thickness d of the side wall 23, the sizes of the second flange 21 and the side wall 23 are more coordinated, and the first flange 11 is also more matched with the second flange 21.
[0051] In addition, by limiting the height h1 of the first flange 11 to be less than or equal to the height h2 of the second flange 21, when the top cover 1 is set on the shell 2, the top surface 212 of the second flange 21 can fit with the surface of the top cover 1 facing the shell 2, thereby preventing foreign matter from entering the interior of the shell 2.
[0052] In this embodiment, the height of the first flange 11 is less than or equal to 1.5 mm.
[0053] For example, the height h1 of the first flange 11 is 1.5 mm, the height h2 of the second flange 21 is 2 mm, and the thickness d of the side wall 23 is 3 mm. Of course, in other embodiments, the height of the first flange 11 can also be less than 1.5 mm, and accordingly, as long as the height h1 of the first flange 11 is less than or equal to the height h2 of the second flange 21, and the height h2 of the second flange 21 is less than or equal to 3 / 4 of the thickness d of the side wall 23, it will be sufficient.
[0054] Corners between the first inclined surface 111 and the surface of the first flange 11 facing away from the top cover 1 and between the second inclined surface 211 and the top surface 212 of the second flange 21 may be rounded to facilitate assembly.
[0055] An embodiment of the present application further provides a battery, comprising the above-mentioned battery casing and a battery cell, wherein the battery cell is disposed in the accommodating cavity.
[0056] The embodiments of the present application also provide an electrical device, including the above-mentioned battery. The electrical device may be a vehicle, a ship, a spacecraft, etc. The vehicle may be a fuel vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.
[0057] In summary, the embodiments of the present application provide a battery casing, a battery and an electrical device, wherein a first flange 11 is circumferentially arranged on the top cover 1, and a second flange 21 is circumferentially arranged at one end of the side wall 23 away from the bottom wall 22, the first flange 11 is continuously arranged along the circumference of the top cover 1, and the second flange 21 is continuously arranged along the circumference of the shell 2, the first flange 11 and the second flange 21 are matched with each other through the first side surface 112 and the second side surface 214, and in the direction from the center of the top cover 1 to the edge, the first flange 11 is located on the outside of the second flange 21, at this time, when the top cover 1 and the shell 2 are welded, light leakage is not likely to occur, and laser or molten welding slag is not likely to splash into the inside of the shell 2, and when the battery cell is arranged in the accommodating cavity 3, the battery cell can be protected.
[0058] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.
Claims
1. A battery casing, characterized in that: The invention comprises a top cover (1) and a shell (2), wherein the shell (2) has a receiving cavity (3) with an opening at one end, the top cover (1) and the shell (2) are connected to close the opening, the top cover (1) is provided with a first flange (11) along the circumference, the first flange (11) faces the shell (2), the shell (2) is provided with a second flange (21) along the circumference, the second flange (21) faces the top cover (1), the first flange (11) matches with the second flange (21), and in the direction from the center of the top cover (1) toward the edge, the first flange (11) is located on the outside of the second flange (21).
2. The battery housing according to claim 1, characterized in that: The first flange (11) has a first inclined surface (111), the second flange (21) has a second inclined surface (211), and the first inclined surface (111) and the second inclined surface (211) are fitted and welded.
3. The battery housing according to claim 2, characterized in that: The included angle α between the first inclined surface (111) and the horizontal plane and the included angle β between the second inclined surface (211) and the horizontal plane are both 30°-60°.
4. The battery housing according to claim 2, characterized in that: The first flange (11) has a first side surface (112), the first side surface (112) is away from the first inclined surface (111), and the first side surface (112) is flush with the side surface of the top cover (1); the second flange (21) has a second side surface (214), the second side surface (214) is away from the second inclined surface (211), and the second side surface (214) is flush with the inner side surface of the shell (2).
5. The battery housing according to claim 1, characterized in that: The first flange (11) is continuously arranged along the circumference of the top cover (1), and the second flange (21) is continuously arranged along the circumference of the shell (2).
6. The battery housing according to claim 5, characterized in that: The shell (2) comprises a bottom wall (22) and a side wall (23) connected to each other, the second flange (21) has a top surface (212) and a bottom surface (213) opposite to each other in its height direction, and the width of the top surface (212), the width of the bottom surface (213) and the thickness of the side wall (23) satisfy: d2 <d1<1 / 2d; Wherein, d is the thickness of the side wall (23), d1 is the width of the top surface (212), d2 is the difference between the thickness of the side wall (23) and the width of the bottom surface (213), and the width direction of the second flange (21) is consistent with the thickness direction of the side wall (23).
7. The battery housing according to claim 6, characterized in that: The height of the first flange (11), the height of the second flange (21) and the thickness of the side wall (23) satisfy: h1≤h2≤3 / 4d; Wherein, h1 is the height of the first flange (11), h2 is the height of the second flange (21), d is the thickness of the side wall (23), and the height direction of the first flange (11) and the height direction of the second flange (21) are both perpendicular to the thickness direction of the side wall (23).
8. The battery casing according to claim 7, characterized in that: The height of the first flange (11) is less than or equal to 1.5 mm.
9. A battery, characterized in that: A battery casing comprising the battery casing according to any one of claims 1 to 8.
10. An electrical device, characterized in that: A battery comprising the battery of claim 9.