Charging and capacity rating method for bare cells of polymer lithium batteries

Abstract

The invention discloses a charging and capacity rating method for bare cells of polymer lithium batteries. The method includes steps: using a high-temperature pressure fixture for fixing a bare cell to be subjected to charging and capacity rating; connecting the bare cell to be subjected to charging and capacity rating to charging equipment through a wire; performing 0.05C constant-current charging to 3.40V, and standing for 5min; performing 0.1C constant-current charging to 3.95V, and standing for 120min; performing 0.5C constant-current constant-voltage charging to 4.2V, and standing for 5min, wherein a cutoff current is 0.05C; performing 0.5C constant-current discharging to 3V, and standing for 5min; performing 0.5C constant-current constant-voltage charging to 3.95V, wherein a cutoff current is 0.05C; carrying out vacuum packaging on the bare cell subjected to charging and capacity rating. By adoption of the method, charging and capacity rating are carried out at the same time, procedures of fixing the bare cell with the clamp and releasing the bare cell from the clamp are effectively reduced, cycle cost is reduced, and labor efficiency is improved; in addition, damages of the bare cell in transferring are reduced, yield is increased, surface smoothness of the cell is guaranteed, and cell quality is improved.

Description

technical field [0001] The invention relates to the field of lithium battery production, in particular to a process method for the formation and capacity of bare cells of polymer lithium batteries. Background technique [0002] With the development of microelectronics technology in the 20th century, miniaturized equipment is increasing day by day, which puts forward high requirements on power supply. With the widespread use of digital products such as mobile phones and notebook computers, lithium-ion batteries have been widely used in such products due to their excellent performance, and are gradually developing into other product application fields. Lithium-ion batteries have also entered a large-scale practical stage. The earliest application was lithium-sub-primary batteries, which were used in cardiac pacemakers. Due to the extremely low self-discharge rate of lithium sub-battery, the discharge voltage is very gentle. It makes it possible to implant the pacemaker into...

AI Technical Summary

Problems solved by technology

In the formation and volumetric stage of this process, the fixture needs to be formed first, and then the fixture should be lowered for vacuum packaging after replacement, and then the fixture should be used for volume separation. After the formation, the clamp needs to be lowered, and the clamp needs to be clamped again before the volume separation, resulting in very low efficiency. low, and its formation and volume separation are carried out in two steps, which seriously prolongs the production cycle of the product and consumes a lot of manpower, material and financial resources

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