Study on the Swelling Behavior of Lithium-ion Power Batteries during Charging and Discharging Processes
The swelling force generated during the charging and discharging process of lithium-ion power batteries will have a serious impact on the battery performance,service life,and even safety.This paper investigated the changes in swelling force,thickness,and capacity during the cyclic charging and discharging process of lithium-ion batteries under constant spacing and constant pressure modes.The results indicate that the charging and discharging process can cause changes in battery swelling force,thickness,and capacity.With the increase of the cycle number of charges and discharges,the swelling force and thickness both increases and the battery capacity decreases.The higher the charging and discharging rate,the greater the swelling force and thickness variation value,and their rising rate also increase.The release of swelling force under constant pressure mode helps to stabilize changes in battery thickness.
Lithium-ion batterycharging and dischargingswelling forcethicknesscapacity
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