| 摘要 |
<p>CCCV charging is applied to a lithium ion secondary battery. During CC charging, a transition point Ta appears in temperature rise gradient when battery temperature rises along with the charging, and with the transition point Ta being a border, a temperature rise gradient in an initial T1 period is steeper than a temperature rise gradient in a T2 period following the T1 period. Based on charging time tT corresponding to timing at which the transition point Ta appears after start of the CC charging from a condition of the SOC of 0%, changeover time ts is set in a range of tT≰ts≰(tT×1.2). The CC charging is performed at a first current value until changeover time tS elapses after its start, and after the changeover time ts elapses, the CC charging is performed with a second current value larger than the first current value.</p> |
