SOC and SOH joint estimation method

A technology of joint estimation and preset time, applied in the direction of instruments, measuring devices, measuring electricity, etc., can solve the problems of battery accuracy degradation, failure to fully consider the SOC and SOH coupling relationship and temperature effects, etc., to reduce performance requirements and improve computing. The effect of efficiency

Active Publication Date: 2019-12-10
HUAZHONG UNIV OF SCI & TECH
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  • Claims
  • Application Information

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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 co

Method used

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  • SOC and SOH joint estimation method

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Embodiment 1

[0032] A joint SOC and SOH estimation method 100, such as figure 1 shown, including:

[0033] Step 110. Obtain a training sample set by performing a cycle charge and discharge experiment on the lithium battery, wherein each training sample in the training sample set includes SOC;

[0034] Step 120, based on the training sample set, train the SOH estimation neural network;

[0035] Step 130: Based on the current SOH, estimate the SOC every first preset time, and when the total time reaches the second preset time, use the neural network to estimate the SOH based on the current SOH, and realize joint estimation of SOC and SOH.

[0036] It should be noted that the trained SOH estimation neural network includes: an input layer, an output layer, and a hidden layer. There are many nodes in the hidden layer, and each node has a certain weight. The training is to determine the weight of the hidden layer nodes of the neural network. The weight of the trained model is fixed. When the m...

Embodiment 2

[0063] A storage medium, wherein instructions are stored in the storage medium, and when a computer reads the instructions, the computer is made to execute any method for joint estimation of SOC and SOH as described in Embodiment 1 above.

[0064] The relevant technical solutions are the same as those in Embodiment 1, and will not be repeated here.

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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...

Claims

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Application Information

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IPC IPC(8): G01R31/3842
CPCG01R31/3842
Inventor 蒋建华刘千千徐小林李结胜夏先龙
Owner HUAZHONG UNIV OF SCI & TECH
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