Power battery module

Abstract

The invention relates to a power battery module, and the battery module comprises a top ventilation pipeline and a plurality of single batteries, wherein the top of each single battery is provided with a top pressure release valve, the upper end of each top pressure release valve is connected with a safety valve, the top ventilation pipeline is arranged above the safety valve, and the upper end ofthe safety valve is communicated with a pipe cavity of the top ventilation pipeline; a sensing device and a cooling liquid spraying device are arranged in the top ventilation pipeline, the sensing device is connected with a control device, and the control device controls the cooling liquid spraying device to act. And when thermal runaway occurs, high-temperature flue gas generated in the single batteries rushes into a pipe cavity of the top ventilation pipeline. After the sensing device senses high-temperature and high-pressure smoke, a signal is sent to the control device, and the control device controls the cooling liquid spraying device to spray cooling liquid in the top ventilation pipeline. The cooling liquid flows into the thermal runaway single batteries, so that the thermal runaway single batteries are effectively cooled, the thermal runaway single batteries can be accurately controlled, the fire extinguishing effect is good, and the short circuit of the normal batteries cannot be caused.

Description

technical field [0001] The invention relates to the field of battery module design for electric vehicles, in particular to a power battery module. Background technique [0002] At present, power batteries are widely used in various electric cars. Therefore, the safety of power batteries has been widely concerned by people. [0003] There is usually a pressure relief valve on the battery pack. A large amount of flammable mixture gas will be generated during the thermal runaway of the battery pack. These combustible mixtures gradually accumulate inside the battery pack during the thermal runaway process, and cause the internal pressure of the battery pack to gradually increase until a predetermined pressure threshold is reached, the battery pack pressure relief valve is opened, and the combustible mixture is discharged Into the external environment, it is very easy to catch fire and cause a fire. [0004] In the research design on the spread control of battery thermal runa...

AI Technical Summary

Problems solved by technology

[0006] The coolant acts on all the batteries in the battery pack, and the normal batteries that have not experienced thermal runaway are also sprayed by the coolant, which may easily cause a short circuit of the normal battery and cause unnecessary losses; at the same time, the coolant cannot accurately control the thermal runaway single battery , the cooling effect is poor

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