Recovery processing method of lithium ion battery, charge/discharge device, and storage medium
A recovery processing method of a lithium ion battery includes repeating a cycle a plurality of times, and the cycle includes a first process of setting an SOC of the lithium ion battery to a first value that is equal to or less than a value of the SOC where a gradient of an SOC-voltage curve is a minimum value through charging, and a second process of setting the SOC of the lithium ion battery to a second value smaller than the first value through discharging.
1 . A recovery processing method of a lithium ion battery, the method comprising:
repeating a cycle a plurality of times,
the cycle including:
a first process of setting an SOC of the lithium ion battery to a first value that is equal to or less than a value of the SOC where a gradient of an SOC-voltage curve is a minimum value through charging; and
a second process of setting the SOC of the lithium ion battery to a second value smaller than the first value through discharging.
2 . The recovery processing method of the lithium ion battery according to claim 1 , wherein the first value is greater than 0%, and the gradient of the SOC-voltage curve is equal to or less than the value of the SOC that is two times the minimum value.
3 . The recovery processing method of the lithium ion battery according to claim 1 , wherein the first value is 15% or less.
4 . The recovery processing method of the lithium ion battery according to claim 1 , wherein, prior to the first process and the second process, whether there is a decrease in performance of the lithium ion battery is determined, and the first process and the second process are performed only when the decrease in performance is confirmed.
5 . A charge/discharge device electrically connected to a lithium ion battery, the device comprising: a controller configured to perform charging/discharging of the lithium ion battery,
wherein the controller repeats a cycle a plurality of times, the cycle including:
a first process of setting an SOC of the lithium ion battery to a first value that is equal to or less than a value of the SOC where a gradient of an SOC-voltage curve is a minimum value through the charging; and
a second process of setting the SOC of the lithium ion battery to a second value smaller than the first value through the discharging.
6 . A non-transitory computer readable storage medium storing a program configured to cause a charge/discharge device electrically connected to a lithium ion battery to repeat a cycle a plurality of times,
the cycle including:
a first process of setting an SOC of the lithium ion battery to a first value that is equal to or less than a value of the SOC where a gradient of an SOC-voltage curve is a minimum value through charging; and
a second process of setting the SOC of the lithium ion battery to a second value smaller than the first value through discharging.