Method and device for detecting aging degree of battery

The invention discloses a method and device for detecting the aging degree of a battery. The method comprises steps of: testing a first battery to obtain a first battery parameter, wherein the first battery is a brand new battery; testing a second battery to obtain a second battery parameter, wherein the second battery is a completely aged battery; testing a third battery to obtain a third battery parameter, wherein the third battery is a to-be-tested battery, the first battery, the second battery, and the third battery are the same kind of batteries, and the aging degree of the third battery is different from that of the second battery; and computing the aging degree of the third battery by using the first battery parameter, the second battery parameter, and the third battery parameter. The method and the device solve a problem of inaccurate aging degree detection in the prior art so as to achieve an effect of accurate detection of the aging degree of the battery.