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Battery fault detection method and device, controller and medium

A battery fault detection and fault technology, applied in the direction of measuring devices, instruments, measuring electronics, etc., can solve the problems of abnormal battery temperature, high local heat generation, shortened mileage, etc., and achieve fast calculation, simple requirements, and simple and fast methods Effect

Pending Publication Date: 2022-06-28
深蓝汽车科技有限公司
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Problems solved by technology

If there is a connection problem or abnormal internal resistance in the battery pack, the mileage will be shortened, and it may even cause local overheating, resulting in abnormal cell temperature, which will further cause thermal runaway accidents
[0003] At present, the method of internal resistance fault early warning is to calculate the internal resistance of each battery cell at a special operating point under the selected characteristic working conditions, and then compare whether there are outliers in the internal resistance of each cell to issue an alarm. ; This kind of early warning method requires independent calculation of the internal resistance of each battery cell, and requires data under specific working conditions, so it is impossible to provide simple and fast early warning

Method used

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  • Battery fault detection method and device, controller and medium
  • Battery fault detection method and device, controller and medium
  • Battery fault detection method and device, controller and medium

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Embodiment Construction

[0054] The present invention will be described below with reference to the embodiments. It should be emphasized that the examples and their specific parameters are to explain the solutions of the present invention, and should not be construed as limitations on the solutions of the present invention.

[0055] The invention provides a battery fault detection method. The execution body of the method can be arranged in the cloud, and the calculation data source is the operation data uploaded by the vehicle according to the requirements of GBT32960. The vehicle does not need to add additional equipment or other requirements, and can operate without disturbing the vehicle battery Under the premise of simple and accurate detection of battery failure. Of course, the execution body of the method can also be selectively arranged at the vehicle end according to specific requirements.

[0056] In this embodiment, the above method is described by taking the cloud as the execution subject....

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Abstract

The invention provides a battery fault detection method. The battery fault detection method comprises the following steps: collecting monomer voltage and monomer current of each battery monomer in a charge-discharge cycle; calculating a first correlation coefficient of each battery monomer and a second correlation coefficient of the battery pack based on the monomer voltage and the monomer current of each battery monomer in the charge-discharge cycle, and calculating a first slope of each battery monomer and a second slope of the battery pack; when the first correlation coefficient and / or the second correlation coefficient meet a preset condition, determining whether each single battery has a fault in the charge-discharge cycle based on a first slope, and determining whether the battery pack has a fault in the charge-discharge cycle based on a second slope; wherein the first correlation coefficient and the first slope of each single battery are both related to the voltage and the current of the single battery; the second correlation coefficient and the second slope of the battery pack are both related to the total voltage and current of the battery pack.

Description

technical field [0001] The invention is applied to the local and remote data platform fault diagnosis system of electric vehicle power lithium battery or lithium battery energy storage system, and specifically relates to a battery fault detection method, device, controller and medium. Background technique [0002] Lithium-ion batteries have the advantages of long cycle life, high specific energy and low self-discharge rate. Electric vehicles using lithium-ion batteries as power batteries have gradually become the mainstream direction of future vehicle development. Power battery safety issues and driving range are market concerns. An important obstacle to the acceptance of new energy vehicles, the thermal runaway of the power battery will cause huge casualties and property losses, and it will also severely damage the market's confidence in accepting electric vehicles and hinder the popularization of new energy vehicles. Therefore, accurate and advanced fault diagnosis technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/367G01R31/382G01R31/389G01R31/396
CPCG01R31/367G01R31/382G01R31/389G01R31/396
Inventor 吴正国蒲江牟晓飞伊炳希万红兵江振文龚关
Owner 深蓝汽车科技有限公司
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