| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method a for manufacturing a reliable battery in a shorter time by shortening a voltage rising period in a self discharge inspection while keeping the accuracy in the self discharge inspection.SOLUTION: A method for manufacturing a nonaqueous electrolyte secondary battery comprises: a step (S10) of constructing a battery assembly including an electrode structure having a positive electrode and a negative electrode opposed to the positive electrode, a nonaqueous electrolyte, and a battery case in which the electrode structure and the nonaqueous electrolyte are housed; a conditioning step (S20) of charging the battery assembly to a condition of SOC65% or more; a high-temperature aging step (S30) of keeping the battery assembly at a high temperature of 50°C or higher; a step (S40) of lowering the temperature of the battery assembly to a room temperature region and then leaving the battery assembly for a predetermined length of time; and a self discharge inspection step (S50) of discharging the battery assembly to the condition of SOC10% or less, leaving the battery assembly discharging by itself for a fixed length of time, and then measuring an amount of the voltage drop. In the leaving step (S40), the length of time to left the battery assembly for is 3-24 hours.</p> |
