MANUFACTURING METHOD FOR NON-AQUEOUS SECONDARY BATTERY

摘要

A manufacturing method for a non-aqueous secondary battery includes the following steps. (a) Preparing an electrode body including a positive electrode having a positive electrode active material layer and a negative electrode having a negative electrode active material layer. (b) Constructing a battery assembly using the electrode body and a non-aqueous electrolyte. (c) Initially charging the battery assembly. (d) Aging the battery assembly at a temperature of 60° C. or higher. (e) Forcibly starting to discharge the battery assembly in said temperature region after lowering the temperature of the battery assembly down to a temperature region of 35° C. or higher and 55° C. or lower. (f) Adjusting the SOC of the battery assembly. (g) Measuring a voltage drop amount by self-discharging the battery assembly. And (h) determining whether or not the battery assembly is qualified based on the voltage drop amount.

主权项

1. A manufacturing method for a non-aqueous secondary battery, the manufacturing method comprising:
(a) preparing an electrode body including a positive electrode having a positive electrode active material layer and a negative electrode having a negative electrode active material layer, a surface area of the negative electrode active material layer being larger than a surface area of the positive electrode active material layer, the negative electrode active material layer having a portion facing the positive electrode active material layer and a portion not facing the positive electrode active material layer; (b) constructing a battery assembly using the electrode body and a non-aqueous electrolyte; (c) initially charging the battery assembly; (d) aging the battery assembly at a temperature of 60° C. or higher; (e) after lowering the temperature of the battery assembly down to a temperature region of 35° C. or higher and 55° C. or lower, forcibly starting to discharge the battery assembly in the temperature region; (f) adjusting an SOC of the battery assembly; (g) measuring a voltage drop amount by self-discharging the battery assembly; and (h) determining whether or not the battery assembly is qualified based on the voltage drop amount.