Battery fault detection method and device

A battery fault detection, battery technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve problems such as difficult range, influence of battery parameter information, etc.

Active Publication Date: 2022-03-01
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conditions such as temperature, SoC, and battery aging will all affect the parameter information of the battery, and it is difficult to set an accurate range of parameter information corresponding to the normal operation of the battery.

Method used

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  • Battery fault detection method and device
  • Battery fault detection method and device
  • Battery fault detection method and device

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Embodiment Construction

[0063] The technical solution in this application will be described below with reference to the accompanying drawings.

[0064] Lithium-ion battery (Lithium-ion cell) can also be called a lithium battery, relying on lithium ions to move between the positive electrode and the negative electrode to realize the mutual conversion of chemical energy and electrical energy, with high energy density, good cycle performance, and low self-consumption. The discharge rate is widely used in the fields of electronic digital products, electric vehicles and energy storage. The application fields and geographical scope of lithium-ion batteries continue to expand, but with the increase in usage, its safety issues have also become prominent.

[0065] On the one hand, the capacity of the battery may suddenly decline sharply, resulting in insufficient power and affecting the normal operation of other electrical systems. On the other hand, the safety risk of a faulty battery is uncontrollable, and...

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Abstract

The invention provides a battery fault detection method and device, and the method comprises the steps: obtaining the impedance spectrum data of each battery in a battery pack, and enabling the impedance spectrum data to comprise the impedance of the battery at a plurality of frequencies; dRT analysis is carried out on the impedance spectrum data of each battery, parameter information of each battery is determined, and the parameter information comprises at least one relaxation time and resistance corresponding to each relaxation time; and when the deviation condition of the first parameter information of the first battery and the second parameter information of the second battery in the plurality of batteries meets a preset fault condition, determining that at least one battery in the battery pack has a fault. By comparing the parameter information of the plurality of batteries, or comparing the current parameter information of the batteries with the historical parameter information, whether the batteries in the battery pack break down or not is determined according to the deviation condition of the parameter information, and the early fault of the batteries can be accurately identified. Furthermore, the fault type and the fault severity of the battery can be judged.

Description

technical field [0001] The present application relates to the field of battery detection, in particular to a battery fault detection method and device. Background technique [0002] Lithium-ion batteries are widely used in electronic digital products, electric vehicles and energy storage fields due to their high energy density, good cycle performance, and low self-discharge rate. But it is also easy to cause security risks due to improper use. At present, the input quantities of the traditional battery management system (BMS) mainly include voltage (U), current (I) and temperature (T), and the temperature is the external temperature of the battery. These parameters are the external characteristic parameters of the battery, but lithium-ion batteries are highly complex electrochemical systems, and it is often difficult to accurately identify internal battery faults (such as overcharge, overdischarge, overtemperature, internal short circuit, external short circuit, leakage, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/392G01R31/388G01R31/389
CPCG01R31/392G01R31/388G01R31/389Y02E60/10
Inventor 谢杰李娟李阳兴
Owner HUAWEI TECH CO LTD
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