Battery charging method and system depending on ambient temperature

Abstract

A method for charging a rechargeable battery comprises estimating an initial state of charge of the battery (SOC), which may be estimated based on a time to polarization or an initial voltage of the battery. The method also comprises charging the battery according to a first charging strategy if the initial state of charge (SOC) is greater than a threshold state of charge (SOC) and according to a second charging strategy if the initial state of charge (SOC) is less than the threshold state of charge (SOC). The first charging strategy comprises charging, by charging circuitry, the battery at a temperature-independent constant charge voltage (CV) and at a first current (I) with power provided from a power source in electrical communication with the charging circuitry. The second charging strategy comprises obtaining, by the charging circuitry, an environmental temperature (T) measured by a temperature sensor in communication with the charging circuitry; calculating, by the charging circuitry, a temperature-based constant charge voltage (CV) based on the environmental temperature (T); and charging, by the charging circuitry, the battery at the temperature-based constant charge voltage (CV) and at a second current (I) with power provided from the power source.