Method and system for detecting abnormal change of single power battery

A power battery and change detection technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as inability to effectively identify abnormal situations, and inability to lock the position of a single cell

Active Publication Date: 2021-05-11
HIGER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unable to effectively identify the possible abnormalities of the single cell, and unable to lock the position of the single cell

Method used

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  • Method and system for detecting abnormal change of single power battery
  • Method and system for detecting abnormal change of single power battery
  • Method and system for detecting abnormal change of single power battery

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Embodiment Construction

[0041] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0042] Such as figure 1As shown, a power battery cell abnormal change detection system, based on the battery management system to collect the voltage of each battery cell in the battery system, establish a cell acquisition model, and identify the highest voltage from all the single cells in the battery system. Cell voltage Vmax, minimum cell voltage Vmin, simultaneously identify the position N1 of the highest cell, and t...

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Abstract

The invention discloses a method for detecting abnormal change of a single power battery, which comprises the following steps: establishing a monomer dynamic data acquisition model, and acquiring voltage data of a monomer cell in real time; obtaining the highest monomer voltage and the lowest monomer voltage according to the collected voltage data; obtaining a charging and discharging process voltage curve, and respectively calculating according to the charging and discharging processes to obtain a highest monomer voltage change, a lowest monomer voltage change, a monomer highest voltage change rate and a monomer lowest voltage change rate; comparing the obtained highest monomer voltage change, the lowest monomer voltage change, the monomer highest voltage change rate and the monomer lowest voltage change rate with a set threshold value, and judging whether the monomer cell has abnormal change or not; and establishing a monomer acquisition model, identifying the highest monomer voltage and the lowest monomer voltage, tracking the change condition in real time in the vehicle running or charging process, and performing corresponding processing according to the monomer voltage change. And possible abnormal conditions of the single battery cell can be rapidly detected and effectively identified.

Description

technical field [0001] The invention belongs to the technical field of power battery detection, and in particular relates to a method and system for detecting abnormal changes of a power battery unit. Background technique [0002] With the vigorous development of new energy technology, power batteries are used more and more in various fields, and are also widely used in new energy vehicles. The safety of power batteries is becoming more and more important. At present, many safety accidents in new energy vehicles are mainly reflected in charging. The power battery is overcharged, the power battery is punctured, and the battery cells are flattened, bulging, and leaking, which causes thermal runaway and heat loss in the power battery system. Proliferation causes vehicles to spontaneously ignite, causing major economic losses. In addition, the above-mentioned problems will also occur when the cell voltage drops abnormally during the continuous discharge of the battery. At pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/367G01R31/396G01R31/388
CPCG01R31/367G01R31/396G01R31/388
Inventor 严国刚李春熊金峰薛凯哲张建利方兰兰
Owner HIGER
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