METHOD OF MANUFACTURING NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

This invention provides a method of manufacturing a nonaqueous electrolyte secondary batteries which includes placing an electrode assembly in a hermetically sealable battery case, injecting a nonaqueous electrolyte into the battery case after the battery case has been set in a pressure-reduced state, and sealing the battery case under atmospheric pressure conditions. Sealing of the battery case is carried out before a given amount of the injected electrolyte completely impregnates the interior of the electrode assembly. As a result, the remaining nonaqueous electrolyte impregnates the interior of the electrode assembly after sealing, thereby making the pressure of voids within the battery case lower than atmospheric pressure.

主权项

1. A method of manufacturing a nonaqueous electrolyte secondary battery, the method comprising:
placing an electrode assembly that includes a positive electrode and a negative electrode in a hermetically sealable battery case; setting the interior of the battery case in which the electrode assembly has been placed in a pressure-reduced state, and injecting a nonaqueous electrolyte into the pressure-reduced battery case; and following electrolyte injection, releasing the pressure-reduced state and sealing the battery case under atmospheric pressure conditions, wherein sealing of the battery case is carried out before a given amount of the injected electrolyte completely impregnates the interior of the electrode assembly, and at a timing such that at least 10 vol % of the nonaqueous electrolyte injected into the battery case impregnates the interior of the electrode assembly after sealing of the battery case, so that the remaining nonaqueous electrolyte impregnates the interior of the electrode assembly after sealing, thereby making the pressure of voids in the battery case lower than atmospheric pressure.