Nitrogen monitoring and protecting device for lithium battery box

Abstract

The invention provides a nitrogen monitoring and protecting device for a lithium battery box. The nitrogen monitoring and protecting device comprises a nitrogen protecting module assembly, a multi-channel flow division control valve, a battery box and a main controller; the nitrogen protecting module assembly outputs at least one path of nitrogen to the multi-channel flow division control valve through a line pipeline; the output end of the multi-channel flow division control valve is connected with the battery box; the main controller is electrically connected with the nitrogen protecting module assembly; the main controller is electrically connected with the battery box and is used for detecting a nitrogen pressure threshold value input into the battery box and establishing a data interaction channel between a battery box BMS system and the main controller. Through arrangement of the nitrogen protecting module assembly, the purposes of preparing high-purity nitrogen from air in real time and the reducing energy consumption are achieved; meanwhile, by means of the inert gas characteristic of the nitrogen, the fire condition in the battery box is limited in real time, and after fire breaks out due to external factors of the battery box, the pulse type fire extinguishing effect on the battery box is achieved through the high-pressure nitrogen stored in a gas storage tank.

Description

technical field [0001] The invention relates to the technical field of lithium battery safety for new energy electric vehicles, in particular to a nitrogen monitoring and protection device for a lithium battery box. Background technique [0002] In recent years, my country's new energy automobile industry has developed rapidly, and power battery companies in the current market are also developing rapidly. With the rapid development of large-capacity and high-energy-density lithium batteries, battery safety cannot be solved from the battery itself. The thermal runaway of lithium batteries causes fires and explosions in the battery box to emerge in endlessly, which in turn causes the entire vehicle to catch fire, posing a huge safety hazard. , so it is imperative to provide a monitoring and protection device that integrates early detection and early warning, process protection, and disposal after thermal runaway occurs. Contents of the invention [0003] Aiming at the defic...

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Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a lithium battery box nitrogen monitoring and protection device to solve the problems raised in the above-mentioned background technology. The present invention reduces energy consumption by producing high-purity nitrogen from the air in real time. At the same time, the high-pressure nitrogen gas stored in the gas storage tank is used to extinguish the fire of the battery box in a pulse manner, which effectively protects the battery box from being torn due to excessive pressure in advance, and solves the problems in the prior art.

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