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Annealing method for rapidly reducing internal stress of lithium battery copper foil

An internal stress, copper foil technology, used in lithium batteries, circuits, electrical components, etc., can solve problems such as copper foil warpage, achieve the effects of sufficient annealing, reduce processing time, and improve stability

Inactive Publication Date: 2020-10-02
JIUJIANG TELFORD ELECTRONICS MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of high warpage of copper foil, various copper foil companies are solving it by adjusting the formula of additives, but so far there is no commonly recognized method

Method used

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  • Annealing method for rapidly reducing internal stress of lithium battery copper foil
  • Annealing method for rapidly reducing internal stress of lithium battery copper foil
  • Annealing method for rapidly reducing internal stress of lithium battery copper foil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Table 1 shows the specific experimental results of the conventional scheme, and Table 2 shows the experimental results of the increased annealing scheme. The results of comparative experiments show that after increasing the annealing scheme, the warpage height of the copper foil is significantly reduced. The experimental results show that the proportion of the drop with high warpage height is smaller, while the drop with lower warpage height is larger. Based on the analysis of the reduced warpage height, the two annealing processes can effectively reduce the warpage height by about 5-8mm.

[0034] Table 1

[0035]

[0036] Table 2

[0037]

[0038]

Embodiment 2

[0040] Table 3 shows the experimental results of increasing the annealing scheme. Comparing the results of Experiment 1 and Experiment 2, it was found that after increasing the annealing scheme, the warpage height of the copper foil was significantly reduced. However, the annealing temperature has a certain influence on the warpage, the higher the annealing temperature, the more the warpage height is reduced.

[0041] table 3

[0042]

Embodiment 3

[0044] Table 4 shows the data required for the warpage height to be reduced to a stable height under different aging conditions of copper foils with different warpage degrees. The data shows that the change data of the copper foil warpage height is related to the aging temperature of the copper foil, the higher the temperature, the faster the warpage decline. The data shows that when the aging temperature of the copper foil is 0°C, all copper foil heights have the problem of warping. This phenomenon shows that the control of the warping height of copper foil is a necessary process to increase the stress release process in the early stage in colder weather.

[0045] Table four

[0046]

[0047] In summary, with the help of the above technical solution of the present invention, through this method, the copper foil is fully annealed by using the electrolytic winding process, the internal stress of the copper foil is released, and the copper foil caused by the internal stress ...

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Abstract

The invention discloses an annealing method for rapidly reducing internal stress of a lithium battery copper foil. The annealing method comprises the following steps: adopting a drying system to dry the copper foil, carrying out natural cooling, and entering first-time heating of an annealing system; carrying out natural cooling, and entering second-time heating of the annealing system; and controlling the wound copper foil temperature. Through the annealing method, the electrolysis winding process is utilized for full annealing of the copper foil, and the internal stress of the copper foil isreleased, so that influence of copper foil warping caused by the copper foil internal stress to the rear end application is effectively avoided; the temperature of the copper foil winding process iscontrolled to realize the purpose of releasing the copper foil stress; the electrolysis time is directly utilized to anneal the expanded copper foil, and the annealing method has the advantages of being sufficient in annealing, saving time and being stable in product quality; and with adoption of the annealing method, the treatment time is effectively shortened, and the stability of the copper foil quality is effectively improved.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to an annealing method for quickly reducing the internal stress of lithium battery copper foil. Background technique [0002] With the vigorous development of the new energy vehicle industry, the market's demand and requirements for power batteries are increasing day by day. As the negative electrode collector material of power batteries, the market demand and requirements of lithium battery copper foil are also changing accordingly. In order to effectively improve the energy density of power batteries, the thickness reduction of copper foil for lithium batteries has become one of the research directions. However, there are a series of problems in the light and thinning of the existing lithium battery copper foil. The technical solution basically adopted by the existing ultra-foil lithium battery copper foil is mainly to improve the elongation, tensile strength and brig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/08H01M4/66H01M10/052
CPCC22F1/08H01M4/661H01M10/052Y02E60/10
Inventor 刘超范远朋江泱
Owner JIUJIANG TELFORD ELECTRONICS MATERIAL CO LTD
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