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Method for evaluating performance states of automotive power batteries

A power battery and battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems that cannot directly reflect the performance status of the battery

Inactive Publication Date: 2013-02-06
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, only basic information such as current, voltage and temperature can be collected during the actual driving of electric vehicles, which cannot directly reflect the current performance status of the battery

Method used

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  • Method for evaluating performance states of automotive power batteries
  • Method for evaluating performance states of automotive power batteries
  • Method for evaluating performance states of automotive power batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Under the ambient temperature conditions of 5°C, 15°C, and 25°C, pulse discharge experiments at 0.1C, 0.3C, and 1.0C rates and pulse charge experiments at 0.1C, 0.3C rates were carried out on the same lead-acid battery. After that, the equivalent circuit model was used for fitting analysis to obtain the battery model parameters of the lead-acid battery at different temperatures and different pulse charge and discharge rates. A database of lead-acid battery model parameters and battery performance status is established, and some data are shown in Table 1.

[0055] Table 1. Battery model parameters and SOC database of lead-acid battery 1.0C rate pulse discharge experiment

[0056]

[0057]

Embodiment 2

[0059] Under the ambient temperature conditions of 5°C, 15°C, and 20°C, pulse charge and discharge experiments at 0.2C, 0.3C, and 0.4C rates were carried out on the same lithium-ion battery. After that, the second-order equivalent circuit model was used for fitting analysis, and the battery model parameters of the lithium-ion battery at different temperatures and different pulse charge-discharge rates were obtained. Establish a database of lithium-ion battery model parameters and battery performance status, and some data are shown in Table 2.

[0060] Table 2 Lithium-ion battery 0.2C rate pulse charging experiment battery model parameters and state of charge SOC database

[0061]

[0062]

[0063] During the operation of the real vehicle, the real-time battery model parameters can be obtained by using the least square method or the Kalman filter algorithm, and the performance status of the battery can be evaluated by comparing with the database stored in the ECU. Ohmic ...

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a method for evaluating performance states of automotive power batteries. Through performing second-order equivalent circuit modeling on automotive power batteries (including lead-acid batteries, nickel-metal hydride batteries, lithium ion batteries, fuel batteries, super batteries and the like), the performance states of the batteries (a state of charge (SOC) and a state of health (SOH)) are transformed to parameters of an equivalent circuit model. An impulse charging-discharging experiment result of each automotive power battery is handled by using a second-order exponential damping fitting method in Origin software, so that the parameters of equivalent resistance and equivalent capacitance in the power batteries are obtained. A database of the power battery model parameters and the battery performance states is established as the basis of evaluating the performance states of the batteries in an operating process of an automobile, so that the power management can be optimized, problems can be found timely, and accidents are avoided.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to the evaluation of the performance state of a vehicle power battery. Background technique [0002] As humans continue to use natural resources such as coal, oil, and natural gas on a large scale, energy crises and environmental problems have become increasingly prominent, and have become important factors restricting the development of human society. For the automobile industry, the development of new energy vehicles is the general trend. Compared with traditional cars, electric vehicles have greater advantages in fuel economy and emission economy. The automobile industry is changing from the traditional fuel engine era to the electrification era. The country has also listed new energy vehicles as one of the seven key industries for development at this stage, and proposed to increase government support such as finance, taxation and finance. [0003] The core part of electric ve...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 张彦琴郭凯
Owner BEIJING UNIV OF TECH