The electrolyte is an ionic conductor that conducts conduction between the positive and negative electrodes of the battery. During the charging and discharging process, lithium ions are transported back and forth between the positive and negative electrodes.

The infiltration of the electrode piece by the electrolyte involves the three-phase contact of solid, liquid and gas.When the electrolyte is injected into the battery case, the air in the case should be discharged from the electrolyte first, and then the electrolyte will adhere to the surface of the positive and negative active materials.

Some electrolytes will enter between the positive electrode-separator-negative electrode through the separator of the winding core.With the continuation of time, there will be the phenomenon that the electrolyte infiltrates the pole piece and the electrolyte in the diaphragm reversely infiltrates the pole piece.

When the standing time is long to a certain extent, under the action of surface tension, the infiltration of the pole piece reaches a balanced state.

How to improve the wettability of electrolyte:

(1) Improve the liquid injection process

(2) Improve the core winding process

(3) Add electrolyte wetting agent