The invention relates to a
lithium ion battery
state of health estimation method. The method includes the following steps that: discharging
voltage, discharging current, and discharging
time data during the charging and discharging of a
lithium ion battery which are performed under a certain working
system before and after the aging of the
lithium ion battery are obtained; discharging
voltage, discharging current, and discharging
time data during identical
state of charge intervals are intercepted from the data which are obtained in the first step; the
state of health indication factor expression of the
lithium ion battery is defined; the value of Vlower limit in the third step is obtained; and an HI value in the formula is obtained, and the
state of health of the battery is obtained. According to the
lithium ion battery state of health estimation method of the invention, the state of health of the
lithium ion battery is estimated according to the apparent data (discharging
voltage, discharging current, and discharging
time data) which can be measured in real time during the work of the battery. The lithium ion battery
state of health estimation method of the invention has he advantages of easiness in parameter acquisition, high applicability and real-time application. The lithium ion battery
state of health estimation method can be easy to embed a battery
management system toestimate the state of health of a battery. The lithium ion battery state of health
estimation method can assist in greatly eliminating the defects of existing test systems or
test equipment, and is very practical.