Method for determining electrolyte distribution in lithium ion battery cell

The invention relates to the technical field of lithium ion batteries, in particular to a method for measuring electrolyte distribution in a lithium ion battery cell, which comprises the following steps: preparing a plurality of parts of electrolyte with different lithium salt concentrations, performing constant potential deposition treatment on each part of electrolyte in a three-electrode system to obtain a current-time curve, drawing a standard Q-C relation curve according to the integral quantity Q of the current-time curve and the corresponding lithium salt concentration C in the electrolyte; disassembling the liquid-injected battery cell to obtain a positive plate, a negative plate or a diaphragm to be measured, stamping the positive plate, the negative plate or the diaphragm into a plurality of unit plates, extracting the unit plates by using an organic solvent to obtain corresponding extract liquor, and performing constant-potential deposition treatment on the extract liquor corresponding to the ith u