Method for estimating battery health of electric automobile

A technology of battery state of health and electric vehicle, which is applied in the estimation of battery state of health of electric vehicle, and estimates the state of health of battery according to the voltage characteristics of the battery charging terminal, which can solve problems such as troubles, and achieve the effect of reliable work and fast speed.

Inactive Publication Date: 2012-05-09
HARBIN INST OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for estimating the state of health of an electric vehicle battery, so as to solve the disadvantages of the prior art that it is cumbersome to calculate parameters such as impedance and internal resistance of the battery when estimating

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  • Method for estimating battery health of electric automobile
  • Method for estimating battery health of electric automobile
  • Method for estimating battery health of electric automobile

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specific Embodiment approach 1

[0022] Specific implementation mode one: the following combination Figure 1 to Figure 7 And the present invention is described in further detail:

[0023] This embodiment includes the following steps: Step 1: discharge the new battery to be tested, and then fully charge it, and record the charging voltage time curve and charging power time curve of the new battery to be tested during the charging process;

[0024] Step 2: Calculate the actual usable capacity Q of the new factory battery to be tested according to the charging power time curve obtained in step 1 new ; Simultaneously calculate the dV / dQ curve according to the voltage-time curve, and set the threshold value of dV / dQ; wherein V is the terminal voltage of the new factory battery to be detected during the charging process, and Q is the cumulative charge of the new factory battery to be detected during the charging process;

[0025] Step 3: According to the threshold value of dV / dQ, calculate the amount of electrici...

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Abstract

The invention discloses a method for estimating battery health of an electric automobile, which relates to methods for estimating battery health according to voltage characteristics of a battery charging end. The method solves the defect that battery parameters, such as impedance, internal resistance and the like, need to be calculated while estimating battery health in the prior art. The method is used for estimating battery health. The method comprises the following steps of: emptying a new battery to be detected, and fully charging the new battery to be detected, and in the fully charging process, recording a voltage-time curve and a charge capacity-time curve of charging of the new battery to be detected; calculating actually usable capacity Qnew of the new battery to be detected; setting a threshold of V / dQ; calculating the charged capacity of the new battery to be detected from the time when the threshold of dV / dQ is realized to the time when the battery is fully charged during the charging process; building a relation curve of the open-circuit voltage and SOC (State Of Charge) of the new battery to be detected; estimating a SOCocv, then, calculating theoretically usable capacity Qtest-full of the attenuated battery; and obtaining the health of the battery to be detected according to the attenuated theoretically usable capacity QoId and the actually usable capacity Qnew of the battery.

Description

technical field [0001] The invention belongs to the electric vehicle control technology, and relates to a method for estimating the state of health of an electric vehicle battery, in particular to a method for estimating the state of health of the battery according to the voltage characteristics of the charging terminal of the battery. Background technique [0002] At present, people pay more and more attention to the protection of the environment and the effective and rational use of energy. Therefore, electric vehicles with high efficiency, energy saving and environmental protection have become the development trend of the automobile industry. Electric vehicles use the electric energy stored in the battery as an energy source. In recent years, with the development of lithium-ion batteries, more and more electric vehicles use lithium-ion batteries as energy storage devices. Accurately measuring the state of health of the battery is particularly important for the implementa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 朱春波逯仁贵冯飞裴磊王天鸶
Owner HARBIN INST OF TECH
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