Battery internal short circuit diagnosis method and device based on electric quantity estimation and storage medium

A short-circuit diagnosis, in-battery technology, used in battery/fuel cell control devices, measurement devices, short-circuit tests, etc., can solve the problems of long duration, no obvious electrical and thermal characteristics, etc., to ensure safety and accuracy. sexual effect

Pending Publication Date: 2022-07-12
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The early internal short circuit has almost no obvious electrical and thermal characteristics, but it lasts for a long time. If the short circuit in the battery can detect the fault early and give an early warning, it can effectively prevent the occurrence of thermal runaway

Method used

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  • Battery internal short circuit diagnosis method and device based on electric quantity estimation and storage medium
  • Battery internal short circuit diagnosis method and device based on electric quantity estimation and storage medium
  • Battery internal short circuit diagnosis method and device based on electric quantity estimation and storage medium

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Embodiment

[0047] like figure 1 As shown, this embodiment provides a method for diagnosing a short circuit in a battery based on power estimation, and the method includes:

[0048] S1. Obtain offline voltage and current data of several charging cycles of the battery to be diagnosed;

[0049]S2. Taking the accuracy of estimating the electric quantity in the charging voltage interval based on the Arrhenius aging model as a constraint condition, using an intelligent optimization algorithm to determine the optimal charging voltage interval of the battery;

[0050] S3. Obtain the actual power in the optimal charging voltage range of the battery online, and determine the charging cycle in which the internal short circuit occurs based on the Arrhenius aging model.

[0051] Among them, the Arrhenius aging model is expressed as:

[0052]

[0053] C A (n)=(1-ξ(n))·C 0

[0054] Among them, ξ(n) is the relative power loss in the battery charging voltage range, A is a constant greater than ze...

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Abstract

The invention relates to a battery internal short circuit diagnosis method and device based on electric quantity estimation and a storage medium. The method comprises the following steps: S1, acquiring voltage and current data of a plurality of charging cycles of a to-be-diagnosed type battery offline; s2, determining the optimal charging voltage interval of the battery by adopting an intelligent optimization algorithm by taking the accuracy of the electric quantity in the charging voltage interval estimated based on an Arrhenius aging model as a constraint condition; and S3, the actual electric quantity in the optimal charging voltage interval of the battery is obtained online, and the charging cycle of the internal short circuit is determined based on the Arrhenius aging model. Compared with the prior art, frequent and real-time diagnosis on the battery in the charging process can be accurately realized on line, the diagnosis accuracy is high, and the safety of the electric vehicle is effectively ensured.

Description

technical field [0001] The present invention relates to the technical field of short-circuit diagnosis in batteries, in particular to a method, device and storage medium for short-circuit diagnosis in batteries based on power estimation. Background technique [0002] As people pay more and more attention to energy saving and environmental protection, electric vehicles are favored by many consumers. Lithium-ion batteries are widely used in electric vehicles because of their high energy density, high power density, and low self-discharge rate. However, lithium-ion batteries have potential safety issues such as thermal runaway, which seriously threaten the personal safety and property safety of consumers. Internal short circuit is one of the main reasons for thermal runaway of the battery. [0003] The early internal short circuit has almost no obvious electrical and thermal characteristics, but it lasts for a long time. If the fault can be detected early in the battery and g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/367G01R31/52B60L58/10
CPCG01R31/367G01R31/52B60L58/10Y02T10/70
Inventor 乔冬冬范文君戴海峰魏学哲
Owner TONGJI UNIV
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