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 battery cell leakage, shallow welding penetration, and easy heat loss of the battery cell, etc.

Active Publication Date: 2010-02-17
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
  • An electric core shell and electric core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A battery case, such as figure 1 As shown, it includes a cylinder body 1, an upper cover plate 2 and a lower cover plate 3. The cylinder body is in the shape of a bottomed cylinder body with an open upper end, and a through hole is provided on the bottom of the cylinder body. There is a circle along the cover plate on the lower cover plate. Boss 30 provided on the edge. A positioning step or a positioning slope 11 is provided on the periphery of the through hole. in passing figure 1 Enlarged view of A in the center figure 2 This embodiment can be understood more clearly. The wall thickness of the battery case is 0.3 mm, and the bottom thickness of the cylinder is 0.8 mm. In this embodiment, the height of the boss is 0.3 mm, and the width of the boss is 0.9 mm.

Embodiment 2

[0025] The structure of this embodiment is basically the same as that of Embodiment 1, the difference is that there is also a ring of bosses arranged along the edge of the through hole on the bottom of the cell casing. In this embodiment, the height of the boss is 0.9 mm, and the width of the boss is 0.3 mm.

Embodiment 3

[0027] This embodiment is basically the same structure as Embodiment 2, as image 3 shown by image 3 Enlarged view of B in Figure 4 The present invention can be understood more clearly. The difference is that in the embodiment, the height of the boss is 0.6 mm, and the width of the boss is 0.6 mm.

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Abstract

This invention discloses a core shell including a drum and up and down cover plates, in which, said drum is a drum with bottom and an aperture at the top, the bottom is set with a through hole characterizing that a convex stand is set along the edge of the down cover plate and a convex stand is also set along the edge of the through hole on the bottom of the drum. This invention also discloses a core using the shell. Since the heat conductivity of air is much lower than that of metal, it can stop losing of heat in laser welding effectively by setting a circle of convex stand along the edge ofthe through hole on the bottom and a convex stand on the bottom cover plate so as to deepen the depth of 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 Patents(China)
IPC IPC(8): H01M2/02H01M10/04H01M10/0525H01M6/16H01M50/169
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 王春光陈保同任灿
Owner ZHENGZHOU BAK BATTERY CO LTD
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