Battery system, SOC estimation method for battery system, computer apparatus, and medium

A battery system, comprising:

• a first-system battery;
• a second-system battery;
• a processor;
• and
• a memory including instructions that when executed by the processor cause the processor to:
• map an upper limit and a lower limit of a state of charge of the second-system battery to a state of charge interval of the battery system, to establish a mapping relationship between the upper limit and the lower limit of the state of charge of the second-system battery and the state of charge interval of the battery system;
• determine an open-circuit voltage of the second-system battery;
• and
• calculate the state of charge of the second-system battery based on the open-circuit voltage of the second-system battery and estimate, using the calculated state of charge of the second-system battery, a state of charge of the battery system according to the mapping relationship, the estimated state of charge of the battery system being a value that reflects the state of charge of the second-system battery and a state of charge of the first-system battery,
• wherein a slope of an open circuit voltage-state of charge (OCV-SOC) curve of the second-system battery is larger than a slope of an OCV-SOC curve of the first-system battery.

A computer device for estimating a state of charge of a battery system that comprises a first-system battery and a second-system battery, the computer device comprising:

• a memory;
• a processor;
• and
• a computer program stored on the memory and executable on the processor, wherein when the computer program is executed by the processor, the processor:
• maps an upper limit and a lower limit of a state of charge of the second-system battery to a state of charge interval of the battery system, to establish a mapping relationship between the upper limit and the lower limit of the state of charge of the second-system battery and the state of charge interval of the battery system;
• determines an open-circuit voltage of the second-system battery;
• and
• calculates the state of charge of the second-system battery based on the open-circuit voltage of the second-system battery and estimates, using the calculated state of charge of the second-system battery, the state of charge of the battery system according to the mapping relationship, the estimated state of charge of the battery system being a value that reflects the state of charge of the second-system battery and a state of charge of the first-system battery,
• wherein a slope of an open circuit voltage-state of charge (OCV-SOC) curve of the second-system battery is larger than a slope of an OCV-SOC curve of the first-system battery.