The invention relates to a method for preparing a
lithium ion battery with a flexible
package, in particular to an aging process of a
lithium ion battery with a flexible
package after being precharged. The aging method of a
lithium ion battery with a flexible
package after being precharged comprises the following steps: putting the precharged
lithium ion battery with the flexible package into the environment at the high temperature of 30-70 DEG C; aging; and standing for 6-24h. The invention optimizes the aging process of the
lithium ion battery with the flexible package after being precharged, rapidly stabilizes the SEI (
Solid Electrolyte Interface) film of the battery after being precharged by selecting the appropriate high-temperature environment, enhances the
conductivity of
electrolyte at the high temperature, strengths the activity, and accelerates the recombination course of the
electrolyte and the SEI film. The aging process after precharge provided by the invention can enhance the filming quality of the
lithium ion battery with the flexible package, can shorten the aging time and is beneficial to the thickness control of the battery at the same time. In the invention, a clamp is used for the lithium ion battery with the flexible package in the high-temperature aging course, and the clamp can exert the pressure on the plane of the battery so that the force of the whole plane is more uniform, and the thickness and shape of the battery are maintained by utilizing the clamp.