Quantitative diagnosis method for short circuit in battery based on voltage and electric quantity outlier coefficients

A diagnostic method and technology of outlier coefficient, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of high cost, inability to quantitatively calculate internal short-circuit resistance, and high technical difficulty, achieving short diagnosis time and easy implementation. , the effect of high diagnostic accuracy

Active Publication Date: 2022-01-04
TONGJI UNIV
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  • Claims
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Problems solved by technology

However, this method is technically difficult and costly, and cannot quantitatively calculate the internal short-circuit resistance

Method used

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  • Quantitative diagnosis method for short circuit in battery based on voltage and electric quantity outlier coefficients
  • Quantitative diagnosis method for short circuit in battery based on voltage and electric quantity outlier coefficients
  • Quantitative diagnosis method for short circuit in battery based on voltage and electric quantity outlier coefficients

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Embodiment

[0048] Such as figure 1 As shown, this embodiment provides a method for quantitatively diagnosing a short circuit in a battery based on voltage and electric quantity outlier coefficients, the method comprising:

[0049] 1) Online collection of voltage, current and charging time data of each single battery during the charging process of the power battery.

[0050] 2) Calculate the voltage outlier coefficient and electric quantity outlier coefficient of each single battery in each cycle charging process respectively.

[0051] Among them, the voltage outlier coefficient is obtained by the following formula:

[0052]

[0053] Among them, u i (n 1 ) for the nth 1 The voltage outlier coefficient of the i-th single battery during the charging cycle, t is the charging time, t 0 (n 1 ) for the nth 1 The start time of a cycle charging process, t s (n 1 ) for the nth 1 The termination time of a cycle charging process, for the nth 1 The voltage of the i-th single battery a...

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Abstract

The invention relates to a quantitative diagnosis method for the short circuit in a battery based on voltage and electric quantity outlier coefficients. The method comprises the following steps: 1), acquiring voltage, current and charging time data of each single battery in the charging process of a power battery on line; 2), respectively calculating a voltage outlier coefficient and an electric quantity outlier coefficient of each single battery in each cyclic charging process; 3), based on the voltage outlier coefficient and the electric quantity outlier coefficient, determining whether the internal short circuit occurs in the power battery and positioning the single battery in which the internal short circuit occurs; and 4), quantitatively calculating the short-circuit resistance value of the single battery with the internal short circuit. Compared with the prior art, the method has the advantages of simplicity and convenience in implementation, short diagnosis time, high diagnosis accuracy and the like.

Description

technical field [0001] The invention relates to the technical field of energy storage batteries, in particular to a method for quantitatively diagnosing short circuits in batteries based on voltage and electric quantity outlier coefficients. Background technique [0002] As the core component of new energy electric vehicles, lithium-ion batteries have the advantages of high energy density, long cycle life, no memory effect, and low self-discharge rate, and have attracted widespread attention. However, there are potential safety problems in lithium-ion batteries. In recent years, many safety accidents of lithium-ion batteries have occurred. Internal short circuit is one of the main causes of lithium-ion battery safety accidents. The symptoms of internal short circuit are not obvious in the early stage, but if it continues to evolve, thermal runaway will occur, causing the battery to burn or even explode. Therefore, it is of great significance to detect the internal short cir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/389
CPCG01R31/389
Inventor 魏学哲乔冬冬戴海峰范文君
Owner TONGJI UNIV
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