Lithium iron phosphate battery thermal runaway monitoring system based on information fusion

Abstract

The invention discloses a lithium iron phosphate battery thermal runaway monitoring system based on information fusion, the position of a battery cell group where a problem battery cell is located is found by monitoring the voltage and current change of the battery cell group, temperature abnormity is found in time by monitoring the temperature and the temperature rise rate of the corresponding battery cell group, and the thermal runaway of the lithium iron phosphate battery is monitored by combining the two modes. The misjudgment condition can be reduced, the problem battery cell group can be found in time, the thermal runaway phenomenon is prevented from being further diffused and spread, and the loss is reduced; in addition, the buffer space is subjected to air exhausting treatment in advance, so that the reaction speed is increased, the requirements for the vacuum degree in the buffer space and the diluting device and the filling degree of inert gas are reduced, combustible gas is exhausted after being diluted, detonation accidents can be avoided, and losses caused by thermal runaway of the battery are reduced.

Description

technical field [0001] The invention belongs to the technical field of storage batteries, and in particular relates to a thermal runaway monitoring system for lithium iron phosphate batteries based on information fusion. Background technique [0002] Lithium battery is a secondary battery with high energy density. Due to its high energy storage density, it is the most commonly used type of battery and has a wide range of applications in products such as computers, mobile phones and electric vehicles. This is a situation caused by overheating inside the battery. During the thermal runaway of the battery, the high temperature will cause the decomposition of the negative electrode SEI film, the decomposition of the positive electrode active material and the oxidative decomposition of the electrolyte. When the battery explodes, a large amount of high temperature, flammable and toxic gases are released from the battery, which will seriously threaten the safety of lithium batterie...

AI Technical Summary

Problems solved by technology

[0002] Lithium battery is a secondary battery with high energy density. Due to its high energy storage density, it is the most commonly used type of storage battery. It is widely used in products such as computers, mobile phones and electric vehicles. Thermal runaway of batteries is a serious problem. A condition caused by internal overheating of the battery. During the thermal runaway of the battery, the high temperature will cause the decomposition of the SEI film of the negative electrode, the decomposition of the active material of the positive electrode, and the oxidative decomposition of the electrolyte, and a large amount of gas will appear, resulting in a sharp increase in the gas pressure inside the lithium-ion battery. The battery explodes, and a large amount of high-temperature, flammable and toxic gases are released from the battery, which will seriously threaten the safety of lithium batteries

[0003] In the prior art, battery thermal runaway cannot be completely avoided. Therefore, in the design process of lithium batteries, it is necessary to monitor and prevent and control the thermal runaway phenomenon of the battery, so as to reduce the loss after the battery thermal runaway, but now In the existing technology, the concentration of methane, hydrogen and other gases that will be generated during the thermal runaway process in the battery pack is mainly monitored to trigger power failure and fire protection. In the case of combustion and explosion caused by discharge, the storage battery is completely destroyed, which does not have a good effect of reducing losses. In order to solve the above problems, the present invention provides the following technical solutions

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