Determination method of high temperature aging time of lithium ion battery
A lithium-ion battery, high-temperature aging technology, applied in the high-temperature aging field of lithium-ion batteries, can solve the problems of prolonging the battery cycle, short high-temperature aging time, not aging, unfavorable to normal production, etc., to ensure aging quality and improve aging efficiency. Effect
Active Publication Date: 2019-07-16
TIANJIN ENERGIES
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Problems solved by technology
The current aging process time after pre-charging is generally between 48-72 hours, but there has been no good way to determine the suitable high-temperature aging time for a system. The high-temperature aging time is too short to achieve the aging effect, and too long Aging time will prolong the cycle of battery production, which is not conducive to normal production
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[0018] A typical embodiment of the present invention provides a method for determining the high-temperature aging time of a lithium-ion battery. Since the aging of the battery cell, the battery cell is taken out from the aging equipment at a preset time interval and cooled, and the discharge DC current of the battery cell is measured after cooling. Resistance DCR value; analyze all the measured DCR values, and select the time when the DCR increases and starts to stabilize as the high temperature aging time of the same system cell.
[0019] The high temperature aging process is a process of reforming and optimizing the SEI film of the battery cell. During this process, the SEI film will be more stable, and the DC internal resistance DCR of the battery cell will increase. When the DCR of the battery cell no longer changes or changes significantly smaller It shows that the reforming and repairing of the SEI film of the cell is completed, and the cell reaches a stable state. The a...
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The invention relates to a method for determining the high temperature aging time of a lithium ion battery, which is characterized in that a battery core is taken out from aging equipment and cooled at a preset time interval from aging of the battery core, and a discharge direct-current internal resistance DCR value of the battery core is measured after cooling; the measured DCR value is analyzed, and the time during which the DCR increases and then starts to be stabilized is selected to act as the high temperature aging time of the battery cores of the same system. It is showed that the battery core completes SEI membrane reforming and restoring when the DCR of the battery core does not change or becomes obviously small in change, and the battery core reaches a stable state. The battery core aging time selected according to the method can ensure the aging quality of the battery core, and the aging efficiency of the battery core is improved.
Description
technical field [0001] The invention relates to high-temperature aging of lithium-ion batteries, in particular to a method for determining the high-temperature aging time of lithium-ion batteries. Background technique [0002] Since the commercial use of lithium-ion batteries in the 1990s, they have developed rapidly due to their high specific energy, long storage life, no pollution, no memory effect, small self-discharge rate, long cycle life, and fast charge and discharge. It has become an ideal power supply for electronic products such as notebook computers and digital cameras, and is also widely used in electric bicycles and electric vehicles. Therefore, research on lithium-ion batteries has always been a hot topic in the battery industry in recent years. [0003] High-temperature aging after pre-formation of pouch cells is a very critical process in the manufacturing process of lithium-ion batteries. The necessity of high-temperature aging is that on the one hand, the...
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IPC IPC(8): G01R31/385G01R31/389G01R31/392
CPCG01R31/3865G01R31/389G01R31/392
Inventor 孙翠平李学冯树南从长杰王驰伟
Owner TIANJIN ENERGIES