Battery casing that is easy to weld

Abstract

This utility model discloses a battery casing that is easy to weld, comprising: a wall and a top cover; the wall is used to place a core; a first chamfer is formed on the outer edge of the end face of the wall, the first chamfer surrounds the end face of the wall; the end face of the wall is flat; the top cover is located on the end face of the wall, the top cover is used to seal the wall, the contact surface between the top cover and the end face of the wall is flat, the end face size of the top cover is smaller than the end face size of the wall, and a second chamfer is formed on the inner edge of the end face of the wall, the second chamfer surrounds the end face of the wall. This utility model has the advantage of improving welding quality.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to battery casings, and more particularly to a battery casing that is easy to weld. Background Technology

[0002] A battery consists of a casing and a core. The casing is further divided into a top cover and a wall. During production, the core is placed into the wall before the bottom cover is assembled, and then the top cover and wall are connected by welding. The wall's cross-section is usually achieved by cutting. During this cutting process, burrs are generated on the edges of the wall's cross-section. These burrs can cause gaps between the top cover and the wall, reducing the weld's strength. Furthermore, the gaps between the burrs and the cover plate during welding can also cause weld holes at the weld location. These defects significantly affect the yield rate in the production of micro-batteries such as button cells. To improve welding quality, a battery casing that is easy to weld is proposed. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art.

[0004] Therefore, this utility model proposes a battery casing that is easy to weld, which has the advantage of improving welding quality.

[0005] According to an embodiment of the present invention, a weldable battery casing includes: a wall and a top cover; the wall is used to place a winding core; a first chamfer is formed on the outer edge of the end face of the wall, the first chamfer surrounds the end face of the wall; the end face of the wall is a plane; the top cover is located on the end face of the wall, the top cover is used to seal the wall, and the contact surface between the top cover and the end face of the wall is a plane.

[0006] According to one embodiment of the present invention, the end face size of the top cover is smaller than the end face size of the wall.

[0007] According to one embodiment of the present invention, a second chamfer is formed on the inner edge of the end face of the wall, and the second chamfer surrounds the end face of the wall.

[0008] According to one embodiment of the present invention, the first chamfer and the second chamfer are spaced apart.

[0009] According to one embodiment of the present invention, a boss is formed on the side of the top cover facing the wall, and when the wall is connected to the top cover, the boss is embedded in the wall.

[0010] According to one embodiment of the present invention, both the wall and the top cover are made of stainless steel.

[0011] According to one embodiment of the present invention, the end face dimension of the boss is smaller than the cross-sectional dimension of the internal space of the wall.

[0012] According to one embodiment of the present invention, both ends of the wall are open, and there are two top covers, which respectively seal both ends of the wall.

[0013] The beneficial effects of this utility model are that by forming a first chamfer on the outer edge of the wall, the burrs in the area are removed during the grinding process of the first chamfer, thereby making the weld between the wall and the top cover more closely contacted and improving the welding effect; and by setting the first chamfer, a weld is formed at the connection between the top cover and the first chamfer, which is equivalent to a molten pool during welding, further improving the welding quality.

[0014] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0015] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments with accompanying drawings, in which:

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0019] Figure 3 This is an enlarged schematic diagram of area A of this utility model;

[0020] Figure label:

[0021] 1. Wall; 11. First chamfer; 12. Second chamfer; 2. Top cover; 21. Boss. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The following describes a weldable battery casing according to an embodiment of the present invention with reference to the accompanying drawings.

[0026] like Figures 1-3 As shown, the easily weldable battery casing according to an embodiment of the present invention includes: a wall 1 and a top cover 2; the wall 1 is used to place the winding core; a first chamfer 11 is formed on the outer edge of the end face of the wall 1, the first chamfer 11 surrounds the end face of the wall 1; the end face of the wall 1 is a plane; the top cover 2 is located on the end face of the wall 1, the top cover 2 is used to seal the wall 1, and the contact surface between the top cover 2 and the end face of the wall 1 is a plane.

[0027] In this embodiment, the end face of the wall 1 can be any desired shape, such as rectangle or circle. A first chamfer 11 is formed around the end face of the wall 1, meaning a first chamfer 11 is formed along the welding direction of the wall 1 and the top cover 2. The first chamfer 11 is formed by grinding, which removes burrs from the outer edge of the wall 1 to prevent burrs from separating the wall 1 and the top cover 2. This results in a closer contact between the welded joints of the wall 1 and the top cover 2, improving the welding effect. Furthermore, by setting the first chamfer 11, a weld seam is formed at the connection between the top cover 2 and the first chamfer 11. This seam acts as a molten pool during welding, further improving the welding quality.

[0028] The end face dimension of the top cover 2 is smaller than that of the wall 1. For example, when the cross-section of the wall 1 is circular, the end face diameter of the top cover 2 is smaller than that of the wall 1. This is to avoid the top cover 2 protruding from the end face of the wall 1 in a certain area after welding due to a slight deviation between the central axis of the top cover 2 and the central axis of the wall 1 during assembly. This reduces the accuracy requirements for the installation position of the top cover 2 and the wall 1, and at the same time reduces the light-blocking area of ​​the top cover 2 on the first chamfer 11, making it easier to monitor the welding effect during welding.

[0029] The difference between the diameter of the top cover 2 and the diameter of the wall 1 is no greater than the width of the projection of the first chamfer 11, so that even if the central axis of the top cover 2 deviates slightly from the central axis of the wall 1, a weld can still be guaranteed between the top cover 2 and the first chamfer 11.

[0030] A second chamfer 12 is formed on the inner edge of the end face of the wall 1, and the second chamfer 12 surrounds the end face of the wall 1.

[0031] In this embodiment, the second chamfer 12 is the same as the first chamfer 11, both formed by grinding. By setting the second chamfer 12, the inner edge of the end face of the wall 1 is made smoother, avoiding scratching the core when the inner edge is a right angle. At the same time, the setting of the second chamfer 12 increases the entrance of the end face of the wall 1, making it easier to insert the core. Furthermore, the burrs at this point are also removed when grinding the second chamfer 12, making the contact between the wall 1 and the top cover 2 more snug. It also avoids the phenomenon of burrs being brought into the wall 1 when the core is inserted, causing a short circuit in the finished product.

[0032] The first chamfer 11 and the second chamfer 12 are spaced apart. That is to say, the end face of the wall 1 retains a portion of flat surface in addition to the first chamfer 11 and the second chamfer 12, so as to fit the top cover 2 and provide support.

[0033] A boss 21 is formed on the side of the top cover 2 facing the wall 1. When the wall 1 is connected to the top cover 2, the boss 21 is embedded in the wall 1.

[0034] In this embodiment, the boss 21 serves as a guide and positioning element to improve the accuracy of the relative position between the top cover 2 and the wall 1.

[0035] Both the wall 1 and the top cover 2 are made of stainless steel. Stainless steel has high strength and requires less thickness in the finished product, resulting in a smaller overall structure, higher space utilization, and meeting the size requirements of micro batteries.

[0036] The end face dimension of the boss 21 is smaller than the cross-sectional dimension of the internal space of the wall 1. In other words, there is a certain gap between the boss 21 and the inner wall of the wall 1 to ensure that the boss 21 can be smoothly inserted into the wall 1. This avoids the phenomenon that the boss 21 cannot be installed due to small dimensional differences caused by the high strength and non-deformation characteristics of stainless steel, thus reducing the dimensional accuracy requirements.

[0037] Both ends of the wall 1 are open, and there are two top covers 2, which seal both ends of the wall 1 respectively. The wall 1 can be just the side wall of the battery casing, with the top and bottom ends of the wall 1 connected and sealed by the top covers 2. Alternatively, the wall 1 can include the side wall and the base, with only one top cover 2 used to seal the upper end.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery case facilitating welding, characterized by, include: A wall (1) is used to place a core; a first chamfer (11) is formed on the outer edge of the end face of the wall (1), and the first chamfer (11) surrounds the end face of the wall (1); the end face of the wall (1) is a plane. Top cover (2), the top cover (2) is located on the end face of the wall (1), the top cover (2) is used to seal the wall (1), and the contact surface between the top cover (2) and the end face of the wall (1) is a plane.

2. The battery case facilitating welding according to claim 1, wherein The end face dimension of the top cover (2) is smaller than the end face dimension of the wall (1).

3. The battery case facilitating welding according to claim 2, wherein, A second chamfer (12) is formed on the inner edge of the end face of the wall (1), and the second chamfer (12) surrounds the end face of the wall (1).

4. The battery case facilitating welding according to claim 3, wherein The first chamfer (11) and the second chamfer (12) are set at intervals.

5. The battery case for ease of welding according to claim 1, wherein The top cover (2) has a boss (21) on the side facing the wall (1). When the wall (1) is connected to the top cover (2), the boss (21) is embedded in the wall (1).

6. The battery casing that is easy to weld according to claim 5, characterized in that, The wall (1) and the top cover (2) are both made of stainless steel.

7. The battery case facilitating welding according to claim 6, wherein The end face dimension of the boss (21) is smaller than the cross-sectional dimension of the internal space of the wall (1).

8. The battery case facilitating welding according to claim 7, wherein, Both ends of the wall (1) are open, and there are two top covers (2), which respectively seal both ends of the wall (1).

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