State of charge (SOC) estimation method of lithium ion battery

Abstract

The invention provides a state of charge (SOC) estimation method of a lithium ion battery and belongs to the battery detection field. The SOC estimation method of the lithium ion battery can accurately and efficiently conduct real time monitoring on all states (terminal voltage, charging and discharging current and surface temperature of each battery) of a lithium ion battery pack in real time, and can timely and accurately conduct estimation on the SOC of an entity battery. The SOC estimation method of the lithium ion battery conducts estimation on the SOC of the entity battery based on hardware in the loop simulation platform of an xPCTarget. The SOC estimation method of the lithium ion battery comprises the following specific steps of data collecting part, a target machine part and a host machine part. Compared with an existing estimation method, the SOC estimation method of the lithium ion battery can accurately and efficiently conduct real time monitoring on the all states (the terminal voltage in real time, the charging and discharging current and the surface temperature of each battery) of the lithium ion battery pack, a power battery pack of an electrical vehicle can achieve an ideal effect, and the SOC estimation method of the lithium ion battery can play a vital role in development of an existing electrical vehicle and make outstanding contribution to environment protection.

Description

technical field [0001] The invention belongs to the field of battery detection. Background technique [0002] With the aggravation of air pollution and the rise of oil prices, electric vehicles have entered people's field of vision due to their various advantages such as cleanliness, safety, and high efficiency. The power battery pack is a very important part that distinguishes electric vehicles from traditional power vehicles, and the level of the battery management system largely determines the performance of the power battery pack. Therefore, a real-time and efficient battery management system is very important. [0003] The power battery is the only energy source for pure electric vehicles. In addition to supplying the electric energy required for driving the vehicle, it is also the working power source for various auxiliary devices on the vehicle. The performance indicators of the power battery largely determine the driving performance of the car, such as the driving ...

AI Technical Summary

Problems solved by technology

[0007] One of the bottlenecks restricting the development of the power battery management system is the real-time and accurate estimation of the state of charge of the battery. However, pure software simulation, using the battery model to represent the physical battery, ignores the noise of the battery charging and discharging process, and the process between batteries. There is a big difference between the difference and the impact of battery aging, and the actual system, so finding an optimized method to study the battery state of charge (SOC) estimation can shorten the lithium-ion battery state of charge (SOC) estimation method. Study the cycle of actual vehicle realization

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