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A method for estimating the state of health of a power battery soh and an electric vehicle

A power battery, state of health technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problem of low SOH online prediction accuracy, and achieve the effect of improving product competitiveness and high accuracy

Active Publication Date: 2021-10-01
奇瑞新能源汽车股份有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies in the above-mentioned technologies, and propose a method for estimating the SOH of the power battery state of health and an electric vehicle, aiming at solving the problem of low online prediction accuracy of the SOH of the above-mentioned vehicle-mounted battery

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  • A method for estimating the state of health of a power battery soh and an electric vehicle
  • A method for estimating the state of health of a power battery soh and an electric vehicle

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Embodiment Construction

[0025] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0026] Figure 1 to Figure 2 A method for estimating the state of health SOH of a power battery is shown, including the following steps:

[0027] Test the available capacity Q of the power battery at the factory 0 , let the tested power battery stand still, and then discharge the power battery until the discharge ends, and record the total discharge capacity Q during the discharge process 01 , where the available capacity Q 0 The available capacity of the power battery after standard charging to full charge, that is, the available capacity of the power battery when it leaves the factory;

[0028] Repeat the above steps to record the discharge capacity Q of the power battery twice 02 and Q ...

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Abstract

The invention provides a method for estimating the state of health SOH of a power battery and an electric vehicle. The method for estimating the state of health SOH of a power battery calculates the available capacity Q' of the current power battery 0 and available capacity Q at the factory 0 The percentage is taken as the SOH of the current state of the power battery; the available capacity of the power battery at the factory and the accumulated power during charging and discharging are used to estimate the SOH of the power battery to more accurately reflect the remaining power of the power battery. Life expectancy; in terms of the measurement accuracy of estimated parameters, the measurement error of the available capacity at the factory and the accumulated power during the charge and discharge process is smaller than the existing SOH estimation method of the power battery state of health; it can realize the health state of the vehicle power battery Real-time online estimation of SOH with high precision can accurately and realistically reflect the state of health SOH of the power battery.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a method for estimating the state of health (SOH) of a power battery and an electric vehicle. Background technique [0002] In order to reduce dependence on oil and environmental pollution, national and local governments have introduced subsidy policies to help the development of new energy vehicles. As the main force of new energy vehicles, electric vehicles are developing rapidly; in the context of no major breakthroughs in power battery technology, one of the biggest factors restricting the popularity of electric vehicles is the life of power batteries; due to the performance of single batteries in groups The differences in charging and discharging temperature, self-discharging rate, and use environment will lead to a significant decrease in the life of the battery pack, that is, the attenuation of the state of health SOH; the state of health SOH of the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/382G01R31/392
CPCG01R31/382G01R31/392
Inventor 王延智曾祥兵宋开通闫鹤黄芳芳赵欢欢郭盼盼朱晓东
Owner 奇瑞新能源汽车股份有限公司
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