SOC and SOH joint estimation method

Abstract

The invention discloses an SOC and SOH joint estimation method, which comprises the following steps: obtaining a training sample set by using data measured by an experiment, wherein each training sample in the training sample set comprises average SOC, environment temperature, current, accumulated charge quantity and corresponding SOH; training a BP neural network to estimate SOH based on the training sample set; and estimating the SOC by using the UKF algorithm every first preset time based on the present SOH, and when the total time reaches second preset time, estimating the SOH by using theneural network on the basis of the environment temperature and current acquired by the current sensor and the SOC and accumulated charge quantity acquired by the SOC estimation algorithm, thereby realizing the joint estimation of the SOC and the SOH. According to the invention, the coupling relationship between the SOC and the SOH and the influence of various aging factors (such as temperature, current and the like) are fully considered in the estimation process of the SOC and the SOH; meanwhile, double-time estimation is adopted according to the change speed difference of the SOC and the SOH, the calculation efficiency is improved on the premise that the estimation precision is not reduced, and intelligent recognition can be well carried out.

Description

technical field [0001] The invention belongs to the field of battery energy storage, and more specifically relates to a method for jointly estimating SOC and SOH. Background technique [0002] With the development of new energy technology, energy storage technology is becoming more and more important. Batteries are the core component of energy storage technology, and the research on batteries is of great significance. SOC and SOH are the basic parameters in the battery management system. Their accuracy not only affects the control effect of the entire BMS, but also affects the service life of the entire battery. How to accurately estimate SOC and SOH is a hot and difficult point in battery research. [0003] SOC is the ratio of the remaining capacity of the battery to the maximum dischargeable capacity of the battery, which changes between 0 and 1 with the charging and discharging process; SOH is the ratio of the current maximum available capacity of the battery to the maxim...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a joint estimation method of SOC and SOH, which is used to solve the problem that the existing SOC and SOH estimation method does not fully consider the coupling relationship between SOC and SOH and the influence of temperature, which leads to the degradation of battery estimation accuracy with the deepening of charging and discharging. question

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