Casing and secondary battery

Abstract

A casing (1), a battery cell (2) being accommodated in the casing (1), and the casing (1) comprising a side wall and a bottom cover; the connection point between the side wall and the bottom cover is a connecting portion (4); after the battery cell (2) is accommodated in the casing (1), a bottom corner portion of the battery cell (2) and an inner side surface of the connecting portion (4) do not interfere with one another; the connection point between the side wall and the bottom cover is thinned to form the connecting portion (4); the connecting portion (4) comprises a longitudinal section (42) in a first direction, a transverse section (41) in a second direction, and an arc-shaped section (43) for connecting the longitudinal section (42) and the transverse section (41), the longitudinal section (42) connecting the arc-shaped section (43) and the side wall, and the transverse section (41) connecting the arc-shaped section (43) and the bottom cover; material reduction treatment is performed at the position of an inner rounded corner of the casing (1), so that interference with the battery cell (2) in the casing (1) can be avoided, and the safety of the battery is improved; moreover, the material reduction treatment method reduces the weight of the casing (1) while satisfying molding processing on the casing (1), and improves the energy density of the battery.

Description

A shell and a secondary battery TECHNICAL FIELD

[0001] The utility model belongs to the secondary battery field, and particularly relates to a shell and a secondary battery. BACKGROUND

[0002] The secondary battery has the advantages of high energy and power density, many cycle times, long storage time, clean and environmental protection, and the like, and is widely applied to electronic devices such as digital cameras, computers, mobile phones and electric tools, and has a wide application prospect in large and medium-sized devices such as electric vehicles, electric bicycles, electric ships and even electric aircrafts and energy storage devices.

[0003] The lithium ion or sodium ion battery has the advantages of light weight, large energy storage, large power, no pollution, long service life, small self-discharge coefficient, wide temperature adaptation range and the like, and is gradually favored by people, and gradually replaces other traditional batteries in the field of energy storage and power batteries.

[0004] The battery is divided into hard-shell batteries and soft-pack batteries, the hard-shell batteries include square batteries and cylindrical batteries, and generally, the hard-shell batteries have the advantages of high production efficiency and good appearance consistency, but the inner corner of the shell of the hard-shell battery is relatively large when meeting the molding process, occupies a large internal space of the shell, is easy to interfere with the battery cell and cause safety hazards, simultaneously increases the weight of the shell and reduces the energy density of the battery. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a shell and a secondary battery, the inner corner position of the shell is subjected to material reduction treatment, interference between the battery cell and the shell can be avoided, and the safety of the battery is improved; and meanwhile, the molding process of the shell is met, the weight of the shell is reduced, and the energy density of the battery is improved.

[0006] To achieve the above-mentioned purpose, the technical scheme of the shell provided by the utility model is as follows:

[0007] A shell, a battery cell is accommodated in the shell, the shell comprises a side wall and a bottom cover, a connecting portion is formed at the connecting position of the side wall and the bottom cover, and the bottom corner portion of the battery cell and the inner side surface of the connecting portion do not interfere with each other after the battery cell is accommodated in the shell.

[0008] Further, the connecting position of the side wall and the bottom cover is thinned or locally thinned to form the connecting portion.

[0009] Further, the connecting portion comprises a longitudinal segment in a first direction, a transverse segment in a second direction and an arc segment for connecting the longitudinal segment and the transverse segment, the longitudinal segment connects the arc segment and the side wall, and the transverse segment connects the arc segment 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 transverse section is not higher than the top surface of the top cover.

[0012] The utility model discloses the beneficial effect is:

[0013] The shell inner fillet position carries out the material reduction processing, can avoid the interference of electric core and shell, promotes the battery security, and the material reduction processing mode satisfies the shell forming process, and the shell weight is reduced, and the energy density of battery is promoted.

[0014] The utility model discloses a secondary battery technical scheme is:

[0015] A secondary battery, comprising a shell and an electric core, the electric core is contained in the shell, and the shell is the shell.

[0016] The utility model discloses the beneficial effect is:

[0017] The shell inner fillet position carries out the material reduction processing, can avoid the interference of electric core and shell, promotes the battery security, and the material reduction processing mode satisfies the shell forming process, and the shell weight is reduced, and the energy density of battery is promoted. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is a secondary battery structure schematic diagram of the utility model;

[0019] Fig. 2 is the top view of Fig. 1 of the utility model;

[0020] Fig. 3 is the longitudinal section view of the shell of the utility model;

[0021] Fig. 4 is the enlarged view of B of Fig. 3 of the utility model;

[0022] Fig. 5 is the section view of A-A of Fig. 2 of the utility model;

[0023] Fig. 6 is the enlarged view of C of Fig. 5 of the utility model;

[0024] Fig. 7 is the state diagram of the electric core bottom corner portion after the electric core is placed in the shell in prior art.

[0025] In the drawing: 1, shell, 2, electric core, 3, top cover, 4, connecting portion, 41, transverse section, 42, longitudinal section, 43, arc section, 5, connecting portion original surface. DETAILED DESCRIPTION

[0026] To solve the problems in the background art, the core inventive concept of the utility model is that: the material of the inner fillet position of the shell is reduced, which can avoid interference with the battery cell in the shell and improve the safety of the battery; and the material reduction method meets the shell forming process, reduces the weight of the shell and improves the energy density of the battery.

[0027] The utility model is further described in detail in combination with the embodiments below.

[0028] The specific embodiment 1 of the single battery provided by the utility model is as follows:

[0029] Referring to the secondary battery shown in FIG. 1, the secondary battery includes a shell 1 and a battery cell 2 installed in the shell 1, and the upper end of the shell 1 is open, thereby facilitating the placement of the battery cell 2 in the shell, and then the shell 1 is sealingly connected with a top cover 3, thereby realizing 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] In order to guarantee the performance of the battery and improve the safety of the battery, as shown in FIGS. 2-6, the shell 1 includes a side wall and a bottom cover, and the connection between the side wall and the bottom cover is a connecting portion 4; after the battery cell 2 is accommodated in the shell 1, the bottom corner portion of the battery cell 2 does not interfere with the inner side surface of the connecting portion 3, thereby preventing the bottom corner portion of the battery cell 2 from directly impacting or abutting on the connecting portion 4, which can cause deformation of the bottom corner portion of the battery cell 2 or cause the bottom surface of the battery cell 2 to fail to adhere to the top surface of the bottom cover, thereby causing a virtual welding phenomenon.

[0031] In order to guarantee the performance, the connecting portion 4 is formed by thinning or locally thinning the connection between the side wall and the bottom cover, and the connecting portion 4 includes a longitudinal segment 42 in a first direction, a transverse segment 41 in a second direction, and an arc segment 43 for connecting the longitudinal segment 42 and the transverse segment 41; the longitudinal segment 42 connects the arc segment 43 and the side wall, the transverse segment 41 connects the arc segment 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 a specific implementation, the shell 1 is formed by cold extrusion processing of a blank metal.

[0032] After processing is completed, the top surface of the transverse segment 41 is not higher than the top surface of the bottom cover, thereby preventing the bottom corner portion of the battery cell 2 from directly impacting or abutting on the connecting portion 4, which improves the safety of the battery; and the material reduction method meets the shell 1 forming process, reduces the weight of the shell 1, and improves the energy density of the battery.

[0033] FIG. 7 shows a case where the connecting portion 4 is not thinned in the prior art, and the original surface 5 of the connecting portion directly impacts or abuts on the bottom corner portion of the battery cell 2, which can cause deformation of the bottom corner portion of the battery cell 2 or cause the battery cell 2 to be raised, thereby causing the bottom surface of the battery cell 2 to fail to adhere to the top surface of the bottom cover, and a virtual welding phenomenon occurs during welding.

[0034] Finally, it needs to be explained that the above is only the preferred embodiment of the present application, and is not used to limit the present application, although the present application is described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical solutions recorded in the foregoing embodiments without paying creative labor, or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A housing characterized by: The electric cell is accommodated in the shell, the shell comprises a side wall and a bottom cover, a connecting portion is formed at the connecting position of the side wall and the bottom cover, and the bottom corner portion of the electric cell and the inner side surface of the connecting portion do not interfere with each other after the electric cell is accommodated in the shell; and the connecting position of the side wall and the bottom cover is thinned or partially thinned to form the connecting portion.

2. The case according to claim 1, characterized in that: The connecting portion comprises a longitudinal segment in a first direction, a transverse segment in a second direction, and an arc-shaped segment for connecting the longitudinal segment and the transverse segment, the longitudinal segment connects the arc-shaped segment and the side wall, and the transverse segment connects the arc-shaped segment and the bottom cover.

3. The case according to claim 2, characterized in that: The first direction is perpendicular to a horizontal plane, and the second direction is parallel to the horizontal plane.

4. The case according to claim 3, characterized in that: The top surface of the transverse segment is not higher than the top surface of the bottom cover.

5. A secondary battery comprising a case and an electrode group, the electrode group being housed inside the case, characterized by: The shell is the shell in any one of claims 1-4.

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