Battery management system SOC estimation precision test system and test method

Abstract

The invention belongs to the technical field of a battery management system and especially relates to a battery management system SOC estimation precision test system and test method. A single voltage simulation source, a battery set total voltage simulation source, a current simulation source, and a battery box temperature field simulation source A data are integrated through a data acquisition control system, high-voltage battery set external characteristic parameters can be simulated, wherein the parameters comprise a single battery voltage, a total voltage, single battery temperature and charge and discharge currents. During battery management system test, the battery management system SOC estimation precision test system is utilized to replace a battery set. The test method can be used for SOC precision test in the battery management system development and test process, thereby greatly reducing development and test period, saving the test cost, and improving the system reliability.

Description

technical field [0001] The invention belongs to the technical field of battery management systems, and in particular relates to a battery management system SOC estimation accuracy test system and a test method. Background technique [0002] As the power source of electric vehicles, the power battery is a key factor affecting the performance of the electric vehicle. It will have a direct impact on the mileage, acceleration capability, and maximum gradeability. The battery state of charge SOC (State of charge) is used to describe the amount of remaining battery power and is an important parameter during battery use. Estimation of battery state of charge (SOC) is the core and difficult point of battery management system research. On the one hand, electric vehicles require accurate estimation of battery SOC, and efficient management of batteries from the perspectives of fully utilizing battery capacity and improving safety, so as to further improve vehicle performance; on the o...

AI Technical Summary

Problems solved by technology

[0004] (1) The battery management system and the charging and discharging machine do not have a synchronization mechanism, and each independently estimates the SOC value of the battery pack. The testers use the method of visual comparison. Due to the large test errors caused by different testers, there are few valid data, and the evaluation of test results is difficult. Difficult, poor data traceability

[0005] (2) The estimation of the SOC of the battery pack is related to factors such as lifespan and ambient temperature. However, when testing according to the above method, due to the impact of the test cycle and test cost, it is not possible to test different lifespans and environments, resulting in a certain degree of accuracy of the test results. limitations

This method is mostly used for SOC calibration of battery management systems. When used for testing, there are still problems of data traceability and poor reliability.

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