Brief analysis of new energy vehicle power battery three ways of heat dissipation

Power battery is the core component of new energy vehicles, and the role of battery diaphragm in the power battery is very important, mainly in a narrow space to separate the battery positive and negative level plate, to prevent the contact between the poles caused by short circuit, but can ensure the ions in the electrolyte in the positive and negative pole through freely. Therefore, the diaphragm is the core material to ensure the safe and stable operation of lithium ion battery.

The electrolyte is to isolate the source of combustion, the diaphragm is to improve the heat resistance temperature, and sufficient heat dissipation is to reduce the battery temperature, to avoid excessive heat accumulation caused by the battery heat loss. If the battery temperature rise sharply to 300 ℃, even if the diaphragm is not melt contraction, electrolyte itself across the electrodes, electrolyte and strong chemical reaction will occur, release the gas, internal high pressure forming and explosion, so it is very important to adopt suitable cooling way.

Introduction to the air-cooled structure of power battery package for heat dissipation

Power battery pack air - cooled structure heat dissipation

1. Install a cooling fan at one end of the battery pack, and leave an air vent at the other end to accelerate the air flow between the gaps of the battery cell and take away the high heat generated when the battery cell works.

2. Heat conducting silicone gaskets are added on the top and bottom of the electrical terminals, so that the heat not easily distributed from the top and bottom can be transferred to the metal shell to dissipate heat through the TIF heat conducting silicone sheet. Meanwhile, the high electrical insulation and puncture resistance of the silicone sheet have a good protection effect on the battery pack.

Introduction to cooling method of liquid cooling structure of power battery pack

Power battery package liquid cooling structure heat dissipation

1. The heat of the cell is transferred to the liquid-cooled tube through the heat-conducting silicon sheet, and the heat is taken away by the free circulation of the coolant's thermal expansion and contraction, so as to unify the temperature of the whole battery pack. The strong specific heat capacity of the coolant absorbs the heat generated when the battery pack works, making the whole battery pack operate within the safe temperature.

2. With good insulation performance and high resilience, the heat-conducting silicone sheet can effectively avoid the problem of vibration, friction and damage between the cells, and the potential for short circuit between the cells. It is the best auxiliary material for the water-cooling scheme.

Introduction to natural convection heat dissipation of power battery pack

Power battery pack natural convection cooling mode

1. This kind of battery pack has a large space and good contact with the air. The exposed part can conduct natural heat transfer through the air, while the bottom part cannot conduct heat transfer through the radiator.

2, heating scheme applied to the new energy automobile market more, before the start of the battery heating heat by thermal conductive silicone pills transfer heat to the battery pack, preheat battery, has the good performance of thermal conductivity of thermal conductive silicone, insulation performance, wear resistance, can effective heat transfer and protection between battery and heating tablets produced by the friction wear, short circuit, etc.

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