Method for estimating charge state of battery

A technology of battery state of charge and battery voltage, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of complex algorithm, large amount of calculation, relying on battery model, etc., to achieve high estimation accuracy, simple algorithm, state The effect of accurate estimates

Active Publication Date: 2014-03-26
HENAN SUDA ELECTRIC AUTOMOBILE TECH
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Problems solved by technology

However, the existing model-based methods either greatly depend on the accuracy of the battery model, or have a large amount of calculation, and the algorithm is too complicated, and there is no better algorithm to solve the above problems

Method used

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  • Method for estimating charge state of battery
  • Method for estimating charge state of battery
  • Method for estimating charge state of battery

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] refer to figure 1 , a method for estimating a state of charge of a battery, comprising the following steps:

[0027] In the first step, the battery current T and the battery voltage y measured on the battery Q under the action of the battery load O are respectively measured by the current sensor P and the voltage sensor R;

[0028] In the second step, input the measured battery current T into the battery model U for calculation, and output the calculated battery voltage

[0029] In the third step, the measured battery voltage y and the calculated battery voltage Input the comparator V respectively for comparison, and obtain the voltage error S;

[0030] The fourth step is to input the obtained battery error S into the third accumulator 3 through two channels respectively. The first channel is to multiply the voltage error S by the proportional coefficien...

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Abstract

Provided is a method for estimating the charge state of a battery. Battery current values obtained and measured by a current sensor are input into a battery model, a battery voltage obtained by calculation is worked out, the battery voltage obtained by calculation is compared with a measured battery voltage, a voltage error is obtained, the voltage error is fed back to the battery model through a proportionality coefficient and an integral coefficient to calibrate the battery model, and an obtained charge state estimated value is made to be more accurate. Due to the fact that the integral value of the voltage error is contained in the voltage error fed back to the battery model, a system has strong robustness, estimating speed can be improved greatly, and the method for estimating the charge state of the battery has the advantages of being high in estimating accuracy, simple in algorithm and the like.

Description

technical field [0001] The invention belongs to the technical field of battery charge state estimation, in particular to a method for battery charge state estimation. Background technique [0002] With the development of the energy crisis and the increasingly prominent environmental problems, electric vehicles, as an important part of green energy, have attracted widespread attention from all over the world. As one of the core components of electric vehicles, batteries are the driving energy of electric vehicles, a major bottleneck restricting the development of electric vehicles, and a major research hotspot at present. However, the research on battery itself involves the integration of multiple disciplines such as materials and electrochemistry. Although certain results have been achieved in the laboratory stage, it is difficult for traction battery products that can actually be applied to electric vehicles to achieve leapfrog development in a short period of time. On the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 徐俊曹秉刚王晶邹忠月续丹
Owner HENAN SUDA ELECTRIC AUTOMOBILE TECH
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