Battery soc estimation method, apparatus, and energy storage device

A battery state of charge (SOC) estimation apparatus, comprising:

• at least one processor and a memory;
• wherein the memory has, stored therein, computer-executable instructions;
• and
• the at least one processor executes the computer-executable instructions stored in the memory, to enable the at least one processor to:
• call an equivalent circuit model of a to-be-tested battery, and acquire offline parameters of the to-be-tested battery;
• calculate alternately a first SOC value of the to-be-tested battery and online parameters of the to-be-tested battery based on the equivalent circuit model and the offline parameters, and select the first SOC value, obtained after the calculation is performed for a preset number of times, as an SOC estimation value;
• and
• calculate a current SOC value of the to-be-tested battery according to the SOC estimation value.

An energy storage device, comprising:

• a battery state of charge (SOC) estimation device and an energy storage battery, wherein the battery SOC estimation device is configured to:
• call an equivalent circuit model of a to-be-tested battery, and acquire offline parameters of the to-be-tested battery;
• calculate alternately a first SOC value of the to-be-tested battery and online parameters of the to-be-tested battery based on the equivalent circuit model and the offline parameters, and select the first SOC value, obtained after the calculation is performed for a preset number of times, as an SOC estimation value;
• and
• calculate a current SOC value of the to-be-tested battery according to the SOC estimation value.