Formation method for flexibly-packaged power lithium-ion battery
A technology of lithium-ion battery and formation method, which is applied in the field of formation process of high-energy-density pouch power lithium-ion battery, which can solve the problems of incomplete electrochemical reaction, poor wettability between pole piece and electrolyte, etc., and achieve sufficient wettability , Increase the formation pressure and increase the effect of wettability
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Embodiment 1
[0033] Inject liquid into the cell, and let the cell stand for 8 hours. Pre-seal the edge, put the cell vertically into the pressure fixture, and charge it according to the following process:
[0034]
[0035] Two seals at a time, vacuum degree ≤ -70KPa. At 35°C, place the cells horizontally for 24 hours.
[0036] Preferably, the steps of secondary pressurized normal temperature charging are as follows:
[0037]
[0038] The parameter requirements of the second and second sealing, the packaging strength is ≥50N / 15mm, and the packaging vacuum is ≤-70KPa.
[0039] The same batch of batteries was randomly divided into two groups, one group was formed by high temperature and normal pressure (existing process)-group A, and one group was obtained according to Example 1 of the present invention-group B, each group had 40 PCS.
[0040]
Embodiment 2
[0042] Same as Example 1, the difference is that the cell is left to stand for 12 hours after liquid injection.
Embodiment 3
[0044] With embodiment 1, the difference is that the steps of charging are as follows:
[0045]
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