Alarming device and method for quick monitoring of power battery failure

Abstract

The invention relates to an alarming device and method for quick monitoring of power battery failure to provide monitoring and alarming of heat failure of battery units serially and parallelly connected in a power battery pack. The alarming device comprises a plurality of heat-sensitive resistors, two heat-sensitive resistor sampling lines, a direct-current power supply and a data acquisition board, the heat-sensitive resistors are directly or indirectly arranged on the serially and parallelly connected battery units respectively, the heat-sensitive resistors are serially connected in order to form a whole Wheatstone bridge, and the data acquisition board acquires a first voltage signal transmitted by the first heat-sensitive resistor sampling line and a second voltage signal transmitted by the second heat-sensitive resistor sampling line based on the principle of Wheatstone bridge, calculates a potential difference between the first voltage signal and the second voltage signal, compares and judges the potential difference and a voltage threshold, and outputs an alarm signal if the potential difference is larger than the voltage threshold. The alarm device is simple and ingenious in structure, low in cost and high in sensitivity, enables real-time monitoring of the temperature of the power battery pack and improves the safety and reliability of power battery pack heat management.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a power battery failure rapid monitoring and alarming device and method. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy and long cycle life. They are widely used in portable consumer electronics products. In recent years, with the increasing pressure of energy saving and emission reduction, lithium-ion batteries have gradually been more and more widely used in the field of electric vehicles. use. Although the reliability of a single lithium-ion battery can be greatly improved in the prior art, and its failure probability is on the order of one in a million, but in the application of battery vehicles, lithium-ion batteries usually need to be connected in series and parallel The scale is grouped (that is, to form a battery module), and the mutual influence between the grouped battery modules is likely to cause battery ...

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Problems solved by technology

[0004] The present invention aims at monitoring the thermal runaway of the battery in the thermal management of the existing power battery pack system, which cannot realize the monitoring of the thermal runaway of all battery cells, and the measurement method using the temperature sensor has low sensitivity and serious lag in measurement and prediction. , to provide a rapid monitoring and alarm device for power battery failure, which adopts a structure in which thermistors are respectively arranged on each battery cell connected in series and parallel, and each thermistor is connected in series in turn to form a Wheatstone bridge as a whole, combined with a data acquisition board to use The potential difference at the measurement end of the Wheatstone bridge is compared with the voltage threshold to determine whether to output an alarm signal

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