| 摘要 |
A nonaqueous electrolyte solution is prepared in a divided form as a first solution having a lower solute content rate than the nonaqueous electrolyte solution, and a second solution formed of ingredients of the nonaqueous electrolyte solution excluding ingredients of the first solution. Next, the first solution is injected into a battery case housing an electrode assembly. Then, the first solution is impregnated into the electrode assembly. Subsequently, the second solution is injected into the battery case. Then, the second solution is impregnated into the electrode assembly.
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