Analysis of three heat dissipation methods for power batteries of new energy vehicles
The power battery is a new energy battery, and the role of the battery separator is also very important. It is mainly to separate the positive and negative stages of the battery in a small space to prevent short-circuit caused by contact between the two poles, but to ensure that the ions in the electrolyte are positive and negative. Pass freely between poles. Therefore, the diaphragm has become a material to ensure the safe and stable operation of lithium-ion batteries.
The electrolyte is to insulate the combustion, the diaphragm is to increase the heat-resistant temperature, and the sufficient heat dissipation is to reduce the battery temperature to avoid excessive heat accumulation and cause thermal runaway of the battery. If the battery temperature rises sharply to 300°C, even if the diaphragm does not melt and shrink, the electrolyte itself, the electrolyte and the positive and negative electrodes will have a strong chemical reaction, releasing gas, forming internal high pressure and exploding, so use a suitable thermal solution is very important.
1. Install a cooling fan at one end of the battery pack, and leave a vent hole at the other end to accelerate the air flow between the gaps of the batteries and take away the high heat generated when the batteries work;
2. Add thermally conductive silicone gaskets to the top and bottom of the electrode, so that the heat that is not easily dissipated from the top and bottom is conducted to the metal shell through the TIF thermally conductive silicone sheet for heat dissipation. At the same time, the high electrical insulation and puncture resistance of the silicone sheet affect the battery. The group has a very good protective effect.
Thermal solutions of liquid cooling structure of power battery pack
1. The heat of the battery cell is transferred to the liquid cooling tube through the thermally conductive silica gel sheet, and the heat is carried away by the free circulation of the cooling fluid thermal expansion and contraction, so that the temperature of the entire battery pack is unified, and the strong specific heat capacity of the cooling fluid is generated when the cell is working. The heat makes the entire battery pack operate at a safe temperature.
2. The thermal conductive silicone sheet has good insulation properties and high resilience, which can effectively avoid the vibration and friction damage between the cells and the hidden danger of short circuit between the cells. It is an auxiliary material for the water cooling scheme.
Introduction of natural convection cooling method for power battery pack
1. This type of battery pack has a large space and good contact with the air. The exposed part can exchange heat naturally through the air, and the bottom part that cannot naturally exchange heat is dissipated through the radiator. The thermal conductive silicone sheet fills the gap between the radiator and the battery pack to conduct heat and shock absorption. ,insulation.
2. The heating plate solution is mostly used in the new energy automobile market. The heat of the battery preheating heating plate before starting is transferred to the battery pack through the thermally conductive silicone film. The preheated battery and the thermally conductive silicone film have good thermal conductivity, insulation performance, Wear resistance, can effectively transfer heat and protect the wear and short circuit caused by friction between the battery pack and the heating plate.
