What does battery soc mean?

Battery SOC refers to the state of charge, which is used to reflect the remaining capacity of the battery. Its value is defined as the ratio of the remaining capacity to the battery capacity, commonly expressed as a percentage; its value range is 0~1, When "SOC=0", it means the battery is fully discharged, and when "SOC=1", it means the battery is fully charged. Battery SOC cannot be measured directly, and its size can only be estimated through parameters such as battery terminal voltage, charge and discharge current, and internal resistance.

The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

Battery refers to a cup, tank or other container or part of a composite container that contains electrolyte solution and metal electrodes to generate electric current. It is a device that can convert chemical energy into electrical energy. Its performance parameters mainly include electromotive force, capacity, specific energy and resistance.

SOC is generally called a system-level chip. It is also said that a system-on-chip is an integrated circuit with a dedicated purpose. It is an inevitable trend in the development of integrated circuits, an inevitable trend in technological development, and the future development of the IC industry.

Battery SOC (State of charge), which is the state of charge, is used to reflect the remaining capacity of the battery. Its value is defined as the remaining capacity in the battery capacity. The ratio is often expressed as a percentage. Its value range is 0~1. When SOC=0, it means the battery is completely discharged. When SOC=1, it means the battery is fully charged.

Battery SOC cannot be measured directly. Its size can only be estimated through parameters such as battery terminal voltage, charge and discharge current, and internal resistance. These parameters are also affected by battery aging, ambient temperature changes, and vehicle driving conditions. Due to the influence of various uncertain factors, accurate SOC estimation has become an urgent problem to be solved in the development of electric vehicles.

Analysis of the main estimation methods of SOC:

1. Internal resistance method. The internal resistance measurement method uses alternating current excitation of different frequencies. Battery, measure the internal AC resistance of the battery, and obtain the SOC estimate through the established calculation model. The battery state of charge measured by this method reflects the SOC value of the battery under a specific constant current discharge condition.

2. Linear model method. The principle of the linear model method is a linear model established based on the change of SOC, current, voltage and the SOC value at the previous time point. This model is suitable for low current and slowly changing SOC. case, it is highly robust to measurement errors and wrong initial conditions.

3. Kalman filtering method. The Kalman filtering method is based on the ampere-hour integral method. The main idea of ​​the Kalman filter method is to make the optimal estimate of the state of the dynamic system in the sense of minimum variance. This method is applied to battery SOC estimation. The battery is regarded as a power system, and the state of charge is an internal state of the system.

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