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Soc and soh joint estimation method, device and terminal equipment of lithium ion battery

A lithium-ion battery and joint estimation technology, which is applied in the field of devices and terminal equipment, and the joint estimation method of SOC and SOH of lithium-ion batteries, can solve the problems of many updated parameters, loose fusion, and difficulty in ensuring accuracy.

Active Publication Date: 2021-09-10
江西猛犸电动科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the available battery usage estimation model is usually constructed through offline battery aging test data, and its integration with the estimation module of remaining power is relatively loose, the applicability is poor, and the accuracy is difficult to guarantee
[0003] Moreover, in the existing technology, although some joint estimation methods of SOC and SOH have been proposed, the practical operation is complicated, there are many parameters to be updated, the calculation amount is large, and the efficiency is low.

Method used

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  • Soc and soh joint estimation method, device and terminal equipment of lithium ion battery
  • Soc and soh joint estimation method, device and terminal equipment of lithium ion battery
  • Soc and soh joint estimation method, device and terminal equipment of lithium ion battery

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Embodiment 1

[0043] Such as figure 1 As shown, this embodiment provides a method for jointly estimating the SOC and SOH of a lithium-ion battery, which can be applied to terminal equipment such as electric motorcycle charging devices, lithium-ion battery intelligent charging devices, and the like. The method for jointly estimating SOC and SOH of a lithium-ion battery provided in this embodiment includes:

[0044] S101. Obtain a polynomial relational expression of the open circuit voltage and SOH of the lithium-ion battery under a specific SOC.

[0045] In a specific application, the open-circuit voltage and SOH value of the lithium-ion battery at a specific remaining capacity are obtained, and a polynomial relationship expression between the two is established. Among them, SOC, the full name is State of Charge, which is the state of charge of the battery, also called the remaining power, which represents the ratio of the remaining dischargeable power of the battery to the power of the ful...

Embodiment 2

[0063] Such as image 3 As shown, this embodiment is a further description of the method steps in the first embodiment. In this embodiment, step S102 includes:

[0064] S1021. Read the terminal voltage of the lithium ion battery.

[0065] S1022. Establish a first-order equivalent circuit model of the lithium-ion battery.

[0066] In a specific application, the first-order equivalent circuit model of any single battery in a lithium-ion battery pack is as follows: Figure 4 shown. Among them, E is the terminal voltage, V OCV is the open circuit voltage, R 0 is the ohmic internal resistance, R 1 C 1 Used to describe the polarization characteristics of the battery during charging and discharging, the polarization resistance R 1 The voltage across the V 1 , I is the charging and discharging current. R 0 , R 1 、C 1 is the parameter to be identified. According to the circuit principle, let τ=R 1 C 1 , then the electrical characteristics of the lithium-ion battery can ...

Embodiment 3

[0096] Such as Figure 5 As shown, this embodiment is a further description of the method steps in the first embodiment. In this embodiment, step S103 includes:

[0097] S1031. Based on the first-order equivalent circuit model of the lithium-ion battery, calculate the ohmic internal resistance, polarization internal resistance, polarization capacitance, terminal voltage, and open-circuit voltage of the lithium-ion battery according to a second preset algorithm, in real time Obtaining the SOC of the lithium-ion battery; wherein, the second preset algorithm is based on an adaptive extended Kalman filter algorithm.

[0098] In a specific application, based on the first-order equivalent circuit model of the lithium-ion battery, the actual temperature, ohmic internal resistance, polarization internal resistance, polarization capacitance, terminal voltage and open circuit voltage of the lithium-ion battery are identified according to the second preset algorithm , to obtain the rem...

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Abstract

The present invention is applicable to the technical field of lithium-ion batteries, and provides a joint estimation method, device, and terminal equipment for SOC and SOH of lithium-ion batteries. The method includes: obtaining the polynomial relationship expression between the open-circuit voltage and SOH of lithium-ion batteries under a specific SOC According to the first preset algorithm, the ohmic resistance, polarization internal resistance, polarization capacitance and open circuit voltage of the lithium-ion battery are obtained in real time, and the ohmic internal resistance, polarization internal resistance, polarization Calculate the capacitance, terminal voltage and open circuit voltage to obtain the SOC of the lithium-ion battery in real time, and obtain the open-circuit voltage of the lithium-ion battery when the SOC of the lithium-ion battery reaches a specific SOC to obtain the SOH of the lithium-ion battery. The invention has simple operation and small calculation amount, and improves the efficiency of joint estimation of SOC and SOH for the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a joint estimation method, device and terminal equipment for SOC and SOH of lithium-ion batteries. Background technique [0002] At present, the available battery usage estimation model is usually constructed through offline battery aging test data, and its integration with the remaining power estimation module is relatively loose, the applicability is poor, and the accuracy is difficult to guarantee. [0003] Moreover, although some joint estimation methods of SOC and SOH have been proposed in the existing technology, the practical operation is complicated, there are many parameters to be updated, the calculation amount is large, and the efficiency is low. Contents of the invention [0004] In view of this, an embodiment of the present invention provides a method, device and terminal equipment for jointly estimating SOC and SOH of a lithium-ion batter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/367G01R31/388G01R31/389G01R31/392
Inventor 吴明舒星
Owner 江西猛犸电动科技有限公司
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