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Method and device for estimating SOC of lithium-ion battery, and terminal equipment

A technology for estimating the temperature of a lithium-ion battery, applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve the problems of installation, reduce the efficiency of battery remaining power estimation, and the high cost of temperature acquisition modules/device, so as to improve efficiency and Accuracy, reducing installation complexity, and saving installation costs

Active Publication Date: 2019-12-24
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

[0003] However, in actual situations, the cost of installing a temperature acquisition module / device is high. For small batteries or battery packs, the installation of the temperature sensing device is relatively complicated, and even the temperature acquisition module / device cannot be installed due to structural reasons. Therefore, the efficiency of the estimation of the remaining capacity of the battery is reduced

Method used

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  • Method and device for estimating SOC of lithium-ion battery, and terminal equipment
  • Method and device for estimating SOC of lithium-ion battery, and terminal equipment
  • Method and device for estimating SOC of lithium-ion battery, and terminal equipment

Examples

Experimental program
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Embodiment 1

[0049] Such as figure 1 As shown, this embodiment provides a method for estimating the SOC of a lithium-ion battery, which can be applied to terminal equipment such as a lithium-ion battery intelligent management device, an electric motorcycle lithium-ion battery management device, and the like. The lithium-ion battery SOC estimation method provided in this embodiment includes:

[0050]S101. Obtain the relationship between the current and the open circuit voltage of the lithium-ion battery at different temperatures and the terminal voltage of the lithium-ion battery at time k; wherein, k is the charging and discharging time.

[0051] In a specific application, HPPC tests are carried out on lithium-ion batteries at different temperatures, and the test results are obtained: the relationship between the current and open-circuit voltage of lithium-ion batteries at different temperatures. The terminal voltage can be read directly. Among them, k is the charging and discharging tim...

Embodiment 2

[0065] Such as figure 2 As shown, this embodiment is a further description of the method steps in the first embodiment. In this embodiment, step S102 includes:

[0066] S1021. Establish a first-order equivalent circuit model of the lithium-ion battery.

[0067] In specific applications, such as image 3 Shown, 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 lithium-ion batteries can be described as:

[0068]

[0069] After discretizing the above formula, we can get:

[0070]

[0071] S1022. Based on the first-order equivalent circuit model of the lithium-ion...

Embodiment 3

[0088] 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:

[0089] S1031. Obtain an estimated temperature of the lithium-ion battery at time k-1 and a temperature parameter of the lithium-ion battery at time k.

[0090]In a specific application, the estimated temperature of the lithium-ion battery at time k-1 (that is, the last time) and the temperature parameter of the lithium-ion battery at time k are read.

[0091] S1032. Calculate the estimated temperature of the lithium-ion battery at time k-1 and the temperature parameter of the lithium-ion battery at time k according to a second preset algorithm, and obtain the estimated temperature of the lithium-ion battery at time k; wherein, the first The second preset algorithm is the law of Fourier thermodynamics.

[0092] In a specific application, the second preset algorithm includes but not limited to Fourier's law of therm...

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Abstract

The invention is applicable to the technical field of lithium-ion batteries, and provides a method and device for estimating SOC of a lithium-ion battery, and terminal equipment, and the method comprises the following steps of obtaining and identifying the relationship between the current of the lithium-ion battery at different temperatures and an open-circuit voltage and the terminal voltage of the lithium-ion battery at time k, obtaining corresponding identification parameters of the lithium-ion battery under different temperatures, obtaining the estimated temperature of the lithium-ion battery at time k and the corresponding identification parameter, obtaining corresponding open-circuit voltage according to the estimated temperature and the remaining power at time k-1, and calculating the open-circuit voltage, terminal voltage, estimated temperature and identification parameters of the lithium-ion battery at time k to obtain the remaining power of the lithium-ion battery at time k.The invention can estimate the remaining power of the lithium-ion battery without a temperature sensor module, thereby saving the installation cost of the lithium-ion battery / lithium-ion battery pack,reducing the complexity of the installation, improving the efficiency and accuracy rate of estimating the remaining power of the lithium-ion battery, and having strong anti-interference ability.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery SOC estimation method, device and terminal equipment. Background technique [0002] The existing method for estimating the remaining power of the battery generally estimates the remaining power of the battery on the premise of having a battery temperature acquisition module / device. [0003] However, in actual situations, the cost of installing a temperature acquisition module / device is high. For small batteries or battery packs, the installation of the temperature sensing device is relatively complicated, and even the temperature acquisition module / device cannot be installed due to structural reasons. Therefore, the efficiency of estimating the remaining battery capacity is reduced. Contents of the invention [0004] In view of this, an embodiment of the present invention provides a lithium-ion battery SOC estimation method, devi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/367G01R31/374G01R31/388G01R31/389
Inventor 吴明舒星
Owner 江西猛犸电动科技有限公司
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