Patent ID: 9255971
Filing Date: 2016-02-09
CPC Classification: G01R,G06F

Claim Text:
1. A method for detecting state of health of batteries performed by a device for detecting state of health of batteries having a detection module, an input module and a computation control module, the method comprising steps of: providing a state-of-health (SOH) curve for a battery through the input module of the device; performing a voltage detection procedure for detecting and recording voltage values of the battery at multiple test points set up in the voltage detection procedure through the detection module of the device, wherein when the voltage detection procedure is a discharging test, the test points respectively correspond to one test point when the battery either stops or starts discharging and another test point when the battery reaches a stable state, and the voltage values of the test points respectively correspond to those when the battery either stops or starts discharging and when the battery reaches the stable state; and when the voltage detection procedure is a charging test, the test points respectively correspond to one test point when the battery either stops or starts charging and another test point when the battery reaches a stable state, and the voltage values of the test points respectively correspond to those when the battery either stops or starts charging and when the battery reaches the stable state; and calculating a ratio of a voltage difference between the voltage values at two of the test points over an original voltage difference and using the ratio to map to a SOH value in the SOH curve through the computation control module of the device; wherein when the voltage detection procedure is a discharging test, the ratio is equal to a voltage difference between the voltage values of the battery at the test points when the battery stops or starts discharging and when the battery reaches the stable state over the original voltage difference of the battery; and when the voltage detection procedure is a charging test, the ratio is equal to a voltage difference between the voltage values of the battery at the test points when the battery stops or starts charging and when the battery reaches the stable state over the original voltage difference of the battery.