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Method of Manufacturing Cylindrical Battery Case with Improved Surface Roughness

A cylindrical battery, surface roughness technology, applied in the direction of cylindrical shell battery/battery, small-sized battery/battery pack, manufacturing tools, etc., can solve the problem of low corrosion resistance of batteries

Active Publication Date: 2019-11-26
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The object of the present invention is to provide a method of manufacturing a cylindrical battery case capable of solving the problem of relatively low corrosion resistance of batteries of electric vehicles and improving the corrosion resistance of the cylindrical battery case

Method used

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  • Method of Manufacturing Cylindrical Battery Case with Improved Surface Roughness
  • Method of Manufacturing Cylindrical Battery Case with Improved Surface Roughness
  • Method of Manufacturing Cylindrical Battery Case with Improved Surface Roughness

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0069] In order to manufacture the cylindrical secondary battery according to the present invention, a step of punching and drawing a nickel-plated substrate (#1) and a step of idling the substrate may be performed. A cylindrical battery case is manufactured through the following steps: a step of drawing a base material to form a battery case (where the drawing process is performed four times) (#4 to #7); performing deep drawing on the base material and main body thinning drawing Step of deep drawing (#8); step of drawing base material (#9); step of step drawing and body thinning drawing of base material (#10); forming taper and flange on base material the step (#11); the step of forming an air vent in the base material (#12); and the step of trimming the base material (#13).

[0070] Specifically, the thinning drawing process at step #8 was performed to reduce the thickness of the base material by 0.04 mm, and the thinning drawing process at step #10 was performed to reduce t...

experiment example 1

[0075] A corrosion resistance test was performed on the cylindrical battery cases manufactured according to Example 1 and Comparative Example 2.

[0076] The corrosion resistance test of the cylindrical secondary battery case was performed under high temperature and high humidity conditions. Specifically, the cylindrical battery case was kept at a temperature of 60° C. and a humidity of 95% RH for 7 days, and the appearance of the cylindrical battery case was photographed to determine whether the surface of the cylindrical battery case was corroded. The corrosion test results of the cylindrical battery case are shown in Figure 4 in the photo.

[0077] refer to Figure 4 , it can be seen that the cylindrical battery case manufactured according to Example 1 was not corroded, but pitting corrosion was observed on the surface of the cylindrical battery case manufactured according to Comparative Example 1.

experiment example 2

[0083]The surface roughness of the cylindrical battery cases manufactured according to Example 1, Comparative Example 2 and Comparative Example 3 was measured using a surface roughness measuring instrument SJ-411 from Mitutoyo Corporation. As the surface roughness, Ra and Rz were measured, and a 4 mm section of the middle portion of each cylindrical battery case was measured in the height direction (vertical direction) of the cylindrical battery case. Measure the surface roughness of cylindrical battery cases based on ISO4287:1997.

[0084] Figure 5 The measurement results of the surface roughness of the cylindrical battery case are shown in the table of .

[0085] refer to Figure 5 , the minimum, maximum and average values ​​of the surface roughness Ra of the cylindrical battery case manufactured according to Example 1 were 0.022, 0.040 and 0.03, respectively, and the surface roughness Ra of the cylindrical battery case manufactured according to Comparative Example 2 The...

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Abstract

The present invention relates to a manufacturing method of a cylindrical battery case with improved surface roughness of the battery case by performing an ironing process among manufacturing processesa plurality of times in order to improve corrosion characteristics of the battery case. The present invention has an effect of reducing the surface roughness and improving the corrosion characteristics by the surface roughness by changing a body outer diameter completion process of a cylindrical battery to a thickness reduction process when manufacturing the cylindrical battery case.

Description

technical field [0001] This application claims the benefit of Korean Patent Application No. 2017-0137092 filed with the Korean Intellectual Property Office on October 23, 2017, the disclosure of which is incorporated herein by reference in its entirety. [0002] The present invention relates to a method of manufacturing a cylindrical battery case, and more particularly, to a method capable of performing a thinning and drawing process as one of the processes of manufacturing a battery case multiple times to reduce the surface roughness of the battery case , A method of manufacturing a cylindrical battery case whereby the corrosion properties of the battery case are improved. Background technique [0003] Generally, there are various secondary batteries such as nickel-cadmium batteries, nickel-hydrogen batteries, lithium-ion batteries, and lithium-ion polymer batteries. These secondary batteries have begun to be used in large-scale products requiring high output, such as elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M10/04B21D51/16B21D22/30H01M50/119H01M50/124H01M50/131H01M50/133
CPCB21D51/16H01M10/0422B21D22/28Y02E60/10H01M50/107Y02P70/50H01M50/133H01M50/124H01M50/131H01M50/119B21D22/30H01M2220/20H01M2220/10C21D9/48C23C30/005Y10T29/49108B21D22/201B21D35/002
Inventor 皇甫光洙李帝俊郑湘锡金俊卓李吉永具圣谟
Owner LG ENERGY SOLUTION LTD
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