Shell and secondary battery

Abstract

A battery cell is contained in a shell, the shell comprises a side wall and a bottom cover, the joint of the side wall and the bottom cover is a connecting part, and after the battery cell is contained in the shell, the corner part of the bottom of the battery cell and the inner side face of the connecting part do not interfere with each other; the connecting part of the side wall and the bottom cover is thinned to form a connecting part; the connecting part comprises a longitudinal section in the first direction, a transverse section in the second direction and an arc-shaped section used for connecting the longitudinal section and the transverse section, the longitudinal section is connected with the arc-shaped section and the side wall, and the transverse section is connected with the arc-shaped section and the bottom cover; according to the utility model, material reduction treatment is carried out on the inner fillet position of the shell, so that interference with the battery core in the shell can be avoided, and the safety of the battery is improved; and the material reducing treatment mode meets the shell forming process, reduces the weight of the shell and improves the energy density of the battery.

Description

Technical Field

[0001] The utility model belongs to the field of secondary batteries, and particularly relates to a housing and a secondary battery. Background Art

[0002] Secondary batteries have the advantages of high energy and power density, many cycle times, long storage time, clean and environmental protection, etc. Therefore, they are widely used in electronic devices such as digital cameras, computers, mobile phones, and power tools, and have broad application prospects in electric vehicles, electric bicycles, electric ships, and even large and medium-sized devices such as electric aircraft and energy storage devices.

[0003] Lithium-ion or sodium-ion batteries have the advantages of light weight, large energy storage, high power, no pollution, long life, small self-discharge coefficient, and wide temperature adaptation range. Therefore, they are gradually favored by people and gradually replace other traditional batteries in the fields of energy storage and power batteries.

[0004] Batteries are divided into hard-shell batteries and soft-pack batteries. Hard-shell batteries include square batteries and cylindrical batteries. Generally speaking, hard-shell batteries have the advantages of high production efficiency and good appearance consistency. However, when the inner fillet of the hard-shell battery meets the processing and forming process, the corresponding fillet is relatively large, occupying a large internal space of the housing, and is likely to interfere with the battery core, causing potential safety hazards. At the same time, it increases the weight of the housing and reduces the energy density of the battery. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a housing and a secondary battery. The inner fillet position of the housing is subjected to a material reduction treatment, which can avoid interference between the battery core and the housing, improve the safety of the battery; and while meeting the housing forming process, the weight of the housing is reduced, and the energy density of the battery is improved.

[0006] To achieve the above purpose, the technical solution of the housing provided by the utility model is:

[0007] A housing, a battery core is accommodated in the housing. The housing includes a side wall and a bottom cover, and the connection part between the side wall and the bottom cover is a connecting part. After the battery core is accommodated in the housing, there is no interference between the bottom corner part of the battery core and the inner side surface of the connecting part.

[0008] Further, the connection part between the side wall and the bottom cover is thinned or partially thinned to form the connecting part.

[0009] Further, the connecting part includes a longitudinal section in the first direction, a transverse section in the second direction, and an arc section for connecting the longitudinal section and the transverse section. The longitudinal section connects the arc section and the side wall, and the transverse section connects the arc section and the bottom cover.

[0010] Further, the first direction is perpendicular to the horizontal plane, and the second direction is parallel to the horizontal plane.

[0011] Further, the top surface of the horizontal section is not higher than the top surface of the bottom cover.

[0012] The beneficial effects of the present utility model are as follows:

[0013] In the present utility model, the inner fillet position of the housing is subjected to a material reduction treatment, which can avoid interference between the battery cell and the housing, and improve the battery safety; and the material reduction treatment method can reduce the weight of the housing while meeting the housing forming process, and improve the energy density of the battery.

[0014] The technical solution of the secondary battery provided by the present utility model is

[0015] A secondary battery, comprising a housing and a battery cell, the battery cell is accommodated inside the housing, and the housing is the above-mentioned housing.

[0016] The beneficial effects of the present utility model are as follows:

[0017] In the present utility model, the inner fillet position of the housing is subjected to a material reduction treatment, which can avoid interference with the battery cell inside the housing, and improve the battery safety; and the material reduction treatment method can reduce the weight of the housing while meeting the housing forming process, and improve the energy density of the battery. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the secondary battery of the present utility model;

[0019] Figure 2 It is the Figure 1 top view of the present utility model;

[0020] Figure 3 It is a longitudinal sectional view of the housing of the present utility model;

[0021] Figure 4 It is the Figure 3 enlarged view at B of the present utility model;

[0022] Figure 5 It is the Figure 2 sectional view taken along line A-A of the present utility model;

[0023] Figure 6 It is the Figure 5 enlarged view at C of the present utility model;

[0024] Figure 7 It is a state diagram of the bottom corner part of the battery cell after the battery cell is placed in the housing in the prior art.

[0025] In the figure: 1. Housing; 2. Battery cell; 3. Top cover; 4. Connecting part; 41. Horizontal section; 42. Longitudinal section; 43. Arc section; 5. Original surface of the connecting part. Detailed implementation manners

[0026] To solve the problems in the background art, the core inventive concept of the present utility model is as follows: By reducing the material at the rounded corner position inside the housing, interference with the battery cell inside the housing can be avoided, improving the battery safety; and the way of reducing the material can meet the housing forming process while reducing the weight of the housing and improving the energy density of the battery.

[0027] The following further describes the present utility model in detail with reference to embodiments.

[0028] Specific embodiment 1 of the single battery provided by the present utility model:

[0029] Referring to Figure 1 the secondary battery shown, the secondary battery includes a housing 1 and a battery cell 2 installed inside the housing 1. The upper end of the housing 1 is open, facilitating the placement of the battery cell 2 into the housing. Then, the housing 1 is hermetically connected to the top cover 3 to achieve the sealing of the single battery. The secondary battery referred to in this embodiment can be a sodium ion battery, a potassium ion battery, a lithium ion battery, etc.

[0030] To ensure the battery performance and improve the battery safety, as Figures 2 - 6 shown, the housing 1 includes a side wall and a bottom cover. The connection part between the side wall and the bottom cover is the connection part 4. After the battery cell 2 is accommodated inside the housing 1, there is no interference between the bottom corner part of the battery cell 2 and the inner side surface of the connection part 3, preventing the bottom corner part of the battery cell 2 from directly hitting or pressing against the connection part 4, resulting in deformation of the bottom corner part of the battery cell 2 or causing a virtual soldering phenomenon due to the bottom surface of the battery cell 2 not being able to fit the top surface of the bottom cover.

[0031] To ensure the performance, the connection part between the side wall and the bottom cover is thinned or partially thinned to form the connection part 4. The connection part 4 includes a longitudinal section 42 in the first direction, a transverse section 41 in the second direction, and an arc section 43 for connecting the longitudinal section 42 and the transverse section 41. The longitudinal section 42 connects the arc section 43 and the side wall, and the transverse section 41 connects the arc section 43 and the bottom cover. The first direction is perpendicular to the horizontal plane, and the second direction is parallel to the horizontal plane. In specific implementation, the housing 1 is formed by cold extrusion processing of blank metal.

[0032] After processing, the top surface of the transverse section 41 is not higher than the top surface of the bottom cover, thus preventing the bottom corner part of the battery cell 2 from directly hitting or pressing against the connection part 4 and improving the battery safety; and the way of reducing the material can meet the forming process of the housing 1 while reducing the weight of the housing 1, thereby improving the energy density of the battery.

[0033] Figure 7In the case where the connecting part 4 in the prior art is not reduced in material or thickness, the original surface 5 of the connecting part will directly impact or press against the bottom corner part of the battery cell 2, which will cause deformation of the bottom corner part of the battery cell 2, or cause the battery cell 2 to be lifted, and further cause the bottom surface of the battery cell 2 not to fit with the top surface of the bottom cover, resulting in a virtual soldering phenomenon during soldering.

[0034] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still make modifications to the technical solutions described in the foregoing embodiments without creative efforts, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A housing, characterized in that: The battery cell is accommodated in a housing. The housing includes a side wall and a bottom cover. The connection part between the side wall and the bottom cover is a connecting portion. After the battery cell is accommodated in the housing, there is no interference between the bottom corner portion of the battery cell and the inner side surface of the connecting portion; the connection part between the side wall and the bottom cover is thinned or partially thinned to form the connecting portion.

2. The housing according to claim 1, characterized in that: The connecting portion includes a longitudinal section in a first direction, a transverse section in a second direction, and an arc section for connecting the longitudinal section and the transverse section. The longitudinal section connects the arc section and the side wall, and the transverse section connects the arc section and the bottom cover.

3. The housing according to claim 2, wherein: The first direction is perpendicular to the horizontal plane, and the second direction is parallel to the horizontal plane.

4. The housing according to claim 3, wherein: The top surface of the transverse section is not higher than the top surface of the bottom cover.

5. A secondary battery, comprising a housing and an electrode assembly, the electrode assembly being received inside the housing, characterized in that: The housing is the housing according to any one of claims 1-4.

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