An electric core shell and electric core

A battery cell and casing technology, which is applied in the field of battery cell components, can solve the problems of shallow welding penetration, high defect rate of laser welding, and easy loss of battery heat.

Active Publication Date: 2008-03-26
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of actual application, it is found that the heat of the battery cell with this shell structure is easily lost during welding, and the welding penetration is shallow, so that the defect rate of laser welding is high, and it is easy to cause the battery cell to leak

Method used

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  • An electric core shell and electric core
  • An electric core shell and electric core

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of electric core housing, as shown in Figure 1, it comprises a cylindrical body 1, upper cover plate 2 and lower cover plate 3, the cylindrical body is the shape of a bottomed cylindrical body with an upper end opening, and a through hole is provided on the bottom of the cylinder , a groove 10 along the circumferential direction is arranged on the bottom of the cylinder. The periphery of the through hole is provided with a positioning step or a positioning slope 11 . This embodiment can be understood more clearly through FIG. 2 , which is an enlarged view at A in FIG. 1 . The wall thickness of the battery case is 0.3 mm, and the bottom thickness is 0.8 mm. In this embodiment, the distance between the groove and the circumference of the through hole is 0.3 mm, the groove width is 0.9 mm, and the depth is 0.2 mm.

Embodiment 2

[0029] The structure of this embodiment is basically the same as that of Embodiment 1, except that no groove is provided on the lower cover. In this embodiment, the distance between the groove and the circumference of the through hole is 0.9 mm, the width of the groove is 0.3 mm, and the depth is 0.4 mm.

Embodiment 3

[0031] The structure of this embodiment is basically the same as that of Embodiment 1. The difference is that a groove along the circumferential direction is also provided on the lower cover of the battery case, as shown in FIG. 3 , through the enlarged view at A in FIG. 3 4 can clearly understand the present invention. In this embodiment, the distance between the cylinder bottom groove and the circumference of the through hole is 0.6mm, the width of the groove is 0.6mm, and the depth is 0.6mm; the distance between the groove of the lower cover plate and the circumference of the through hole is 0.6mm, and the width of the groove is 0.6mm, the depth is 0.35mm;

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Abstract

This invention discloses a shell of electric core and a core using it, in which, the shell includes a drum, a top cover plate and a bottom cover plate, and the drum is a drum with a bottom with a through hole and an paerture at the top, a groove along the circle is set on the bottom plate and a groove along the circle is set on the drum of the shell. Since the heat conductivity of air is much lower than that of metal, it can stop losing of heat at the welding place when welding by laser effectively by grooves along the circle directin on the drum bottom and on the bottom plate so as to deepen the depth fusion under definite laser strength.

Description

technical field [0001] The invention relates to an electric core assembly, in particular to a casing of an electric core and an electric core. Background technique [0002] Lithium-ion batteries are large-capacity, high-power batteries, which are mainly used in small devices, especially mobile phones, laptop computers, and portable power tools. Lithium-ion batteries are generally composed of a battery case, a battery winding body housed in the casing, and an electrolyte. The battery winding body is wound from positive and negative electrode sheets and a separator. The existing aluminum cylindrical lithium-ion cell housing is generally composed of a cylindrical cylinder and upper and lower cover plates. The positive and negative terminals are connected, and then the upper and lower cover plates are welded to the upper and lower ends of the cylinder by laser welding, making it a closed space. Due to the lack of necessary positioning structure in the housing with this structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M10/40H01M6/00H01M50/169
CPCY02E60/122
Inventor 毛焕宇黄加军郑荣鹏吴抗张拥乱张建文
Owner ZHENGZHOU BAK BATTERY CO LTD
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