Battery pack with fire extinguishing function

Abstract

The invention belongs to the technical field of battery packs, and particularly relates to a battery pack with a fire extinguishing function. The battery pack comprises a battery unit, a cooling liquid tank filled with cooling liquid, a cooling loop communicated to the cooling liquid tank, a driving device for enabling the cooling liquid to flow, and a fire extinguishing pipeline communicated withthe cooling loop, the fire extinguishing pipeline comprises a spray pipe which spans over the battery unit and is easy to fuse; a control switch is arranged at the joint of the fire extinguishing pipeline and the cooling loop; and the control switch controls the cooling liquid tank to be alternatively communicated with the cooling loop and the fire extinguishing pipeline. By adopting the technical scheme of the invention, the spray pipe which is easy to fuse is additionally arranged on the original cooling loop of the battery pack, so that the battery pack can be accurately positioned to a thermal runaway battery unit for fixed-point fire extinguishing, the structure is compact, the fire extinguishing effect is better, and battery loss caused by false alarm of a thermal runaway alarm canbe avoided.

Description

technical field [0001] The invention relates to the technical field of battery packs, in particular to a battery pack with a fire extinguishing function. Background technique [0002] At present, electric vehicle safety accidents occur frequently, among which, one of the major factors causing electric vehicle safety accidents is the spontaneous combustion of batteries. The battery includes a box and a battery unit located inside the box. When a battery unit fails thermally, it releases a high-temperature heat flow. After the high-temperature heat flow leaks, it is easy to burn when it comes into contact with the air, and when the heat flow spreads to adjacent battery units, it will cause the battery pack to burn. Serious harm to the personal safety of passengers and drivers. [0003] Therefore, the current power battery usually adds a fire sprinkler system. When the battery unit is thermally out of control, the fire sprinkler system will spray flame retardants into the batt...

AI Technical Summary

Problems solved by technology

[0004] However, since the existing fire sprinkler system needs to be equipped with an independent storage tank for fire extinguishing agent, and the storage tank needs to occupy a large installation space, there are great limitations when transplanting the fire sprinkler system to different models

Moreover, the existing battery fire extinguishing system uses a fire extinguishing nozzle. When thermal runaway of the battery is detected, the valve of the fire extinguishing pipeline is opened to spray cooling water on the battery. However, the existing fire extinguishing system cannot target the thermal runaway battery. The unit is used to extinguish the fire at a fixed point, and if there is a detection error, it will spray the fire on the normal working battery, causing the battery to be scrapped

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