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Method and device for determining state of charge of battery

A technology of battery state of charge and state of charge, which is applied in measurement devices, measurement of electricity, measurement of electric variables, etc., can solve problems such as low calculation accuracy, and achieve the effects of high calculation accuracy, accurate results, and noise removal.

Pending Publication Date: 2020-06-23
GEELY AUTOMOBILE INST NINGBO CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of low calculation accuracy caused by simultaneous divergence of capacity and ohmic internal resistance in the existing method for determining the state of charge, the present invention proposes a method and device for determining the state of charge of a battery. Realized by the following technical scheme

Method used

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  • Method and device for determining state of charge of battery
  • Method and device for determining state of charge of battery
  • Method and device for determining state of charge of battery

Examples

Experimental program
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Effect test

Embodiment 1

[0064] to combine figure 1 As shown, a method for determining the state of charge of a battery proposed in Embodiment 1 of the present invention includes:

[0065] Obtaining step S101: obtaining the current, voltage, auxiliary parameters and saved parameters of the battery, where the auxiliary parameters include open circuit voltage, polarization internal resistance and polarization capacitance;

[0066] Capacity parameter determination step S102: according to the current, auxiliary parameters and saved parameters, determine and save the capacity parameters of the battery;

[0067] Ohmic internal resistance parameter determination step S103: Determine and save the ohmic internal resistance parameter of the battery according to the current, voltage, auxiliary parameters and saved parameters;

[0068] State of charge determination step S104: Determine and save the real-time state of charge of the battery according to the capacity parameters, ohmic internal resistance parameters...

Embodiment 2

[0092] to combine Figure 2 to Figure 4 As shown, Embodiment 2 provides a device 100 for determining the state of charge of a battery, which is used to perform the above method, including an acquisition module 10, a capacity parameter determination module 20, an ohmic internal resistance parameter determination module 30, and a charge state determination module 40 and update module 50;

[0093] The obtaining module 10 is used to obtain the current, voltage, auxiliary parameters and saved parameters of the battery, and the auxiliary parameters include open circuit voltage, polarization internal resistance and polarization capacitance;

[0094] The capacity parameter determining module 20 is used to determine and save the capacity parameter of the battery according to the current, auxiliary parameters and saved parameters;

[0095]The ohmic internal resistance parameter determination module 30 is used to determine and save the ohmic internal resistance parameter of the battery ...

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Abstract

In order to solve the problem of low calculation precision caused by simultaneous divergence of capacity and ohmic internal resistance in an existing method for determining the state of charge, the invention provides a method and a device for determining the state of charge of a battery. The method comprises the following steps: acquiring current, voltage, auxiliary parameters and stored parameters of a battery, wherein the auxiliary parameters comprise open-circuit voltage, polarization internal resistance and polarization capacitance; determining and storing capacity parameters of the battery according to the current, the auxiliary parameters and the stored parameters; according to the current, the voltage, the auxiliary parameters and the stored parameters, ohmic internal resistance parameters of the battery are determined and stored, determining and storing the real-time state of charge of the battery according to the capacity parameter, the ohmic internal resistance parameter andthe auxiliary parameter; and an updating step: updating the stored parameters according to the real-time state of charge, and returning to execute the obtaining step. According to the method, the capacity and the ohmic internal resistance are determined respectively, simultaneous divergence of the capacity and the ohmic internal resistance is avoided, and the estimation precision of the state of charge is improved.

Description

technical field [0001] The invention relates to the technical field of power battery packs, in particular to a method and device for determining the state of charge of a battery. Background technique [0002] With the degree of battery aging, the two parameters of battery internal resistance and capacity will gradually change. If the battery state of charge estimation does not consider the parameter changes, the estimation accuracy will be significantly deteriorated, which will affect the performance of the battery management system and the effect of the vehicle energy management strategy. [0003] The battery state of charge (SOC) indicates the remaining power of the battery and is the core parameter of the battery management system. The battery state of charge is the calculation basis for parameters such as the battery state of power (SOP), and is also the decision basis for the vehicle energy management strategy. Therefore, the estimation accuracy of the SOC directly affe...

Claims

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Application Information

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IPC IPC(8): G01R31/396G01R31/382G01R31/389
CPCG01R31/396G01R31/382G01R31/389
Inventor 周放陈玉星岳翔潘福中邬学建刘刚张俊杰霍艳红翟一明张鲁宁王芳芳王路
Owner GEELY AUTOMOBILE INST NINGBO CO LTD