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Method for eliminating swelling of soft-packing lithium ion battery

An ion battery, soft-packed lithium technology, used in secondary battery gas removal, electrical components, secondary batteries, etc., can solve the problems of unstable film formation, and it is difficult to eliminate flatulence due to flatulence, so as to improve battery stability and eliminate battery. Flatulence, simple and effective battery flatulence effect

Active Publication Date: 2017-12-22
四川长虹电源有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: it is difficult to eliminate the problem of flatulence in existing soft-pack lithium-ion batteries that have been produced and formed due to unstable film formation or long-term low-charge state storage.

Method used

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  • Method for eliminating swelling of soft-packing lithium ion battery
  • Method for eliminating swelling of soft-packing lithium ion battery
  • Method for eliminating swelling of soft-packing lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0028] What embodiment 1 adopts is the IFP11200320-50Ah lithium iron phosphate battery that produces flatulence after the completion of production, and its design capacity center value is 53500mAh.

[0029] Embodiment 1 Eliminate flatulence of soft pack lithium ion battery with the method of the present invention

[0030] Use a fixture to apply 4Kg / cm to the inflated lithium iron phosphate battery IFP11200320-50Ah 2 The pressure is compressed; and then the battery is fully charged with a constant current and constant voltage method using a charge-discharge machine, specifically at a rate of 0.2I t (10A) current constant current charge to 3.6V, turn to constant voltage (3.6V) charge until the cut-off current ≤ 0.01I t (0.5A); Then, the clamp was depressurized and the battery was unloaded, and it was left at 25° C. for 30 days.

Embodiment 2

[0031] Embodiment 2 Eliminate flatulence of soft pack lithium ion battery with the method of the present invention

[0032] Use a fixture to apply 6Kg / cm to the inflated lithium iron phosphate battery IFP11200320-50Ah 2 The pressure is pressed tightly; the battery is fully charged with a constant current and constant voltage method using a charge-discharge machine, specifically at 0.2I t (10A) current constant current charge to 3.6V, turn to constant voltage (3.6V) charge until the cut-off current ≤ 0.01I t (0.5A); Then, the clamp was depressurized and the battery was unloaded, and it was left at 40° C. for 14 days.

Embodiment 3

[0033] Embodiment 3 eliminates flatulence of soft pack lithium ion battery with the method of the present invention

[0034] Use a fixture to apply 8Kg / cm to the inflated lithium iron phosphate battery IFP11200320-50Ah 2 The pressure is compressed; specifically, the first is to use 0.5I t (50A) constant current charging to 3.5V, and then 0.1I t After constant current charging to 3.6V, turn to constant voltage (3.6V) to charge until the cut-off current ≤ 0.01I t (0.5A); then, the clamp was depressurized and the battery was unloaded, and it was left at 50° C. for 5 days.

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a method for eliminating swelling of a soft-packing lithium ion battery to solve the problems of swelling and difficulty in swelling elimination due to unstable film formation or long-time low-charge-state storage of existing soft-packing lithium ion batteries. The method for eliminating swelling of the soft-packing lithium ion battery comprises steps as follows: a swelling battery is pressurized and pressed tightly with a clamp, and gas between layers of pole pieces is discharged to an aluminum-plastic film casing; b, the battery is fully charged with a constant-current and constant-voltage charging method; c, the clamp is used for relieving the pressure, and the battery is unloaded and left to stand at the temperature of 20-60 DEG C for 1-30 d. The method is simple and effective, lithium-intercalated carbon of a cathode of the battery can react with gases such as olefin and the like under higher reduction-state electric potential to be consumed, besides, an SEI film on the surface of the cathode can be repaired, the battery stability is improved, and the production cost is saved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for eliminating flatulence of a soft-pack lithium-ion battery. Background technique [0002] In recent years, with the country's emphasis on the new energy industry, lithium-ion batteries have developed rapidly. Lithium-ion batteries are divided into steel shells, aluminum shells, plastic shells, and aluminum-plastic films according to the material of the shell. The first three have a certain degree of rigidity and have ample space. When in use, even if a slight gas is produced inside the battery, it will not affect the discharge of the battery. capacity. Lithium-ion batteries packaged with aluminum-plastic film are called soft-pack lithium-ion batteries because of the lightness and softness of the aluminum-plastic film. This type of battery has a higher energy density and is favored by the market. Gas will be produced inside, and flatulence will occur, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/52
CPCH01M10/52H01M10/523Y02E60/10
Inventor 肖艳耿铁成何右田嫚
Owner 四川长虹电源有限责任公司
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