Three heat dissipation methods and principles of power lithium battery

Date:Apr 27, 2020

The power lithium battery is the core of the new energy battery. The purpose of the battery separator is also very important. The important thing is to separate the positive and negative level plates of the battery in a small space to prevent short circuit caused by the contact of the two poles, but it can ensure that the ions in the electrolyte are Pass freely between positive and negative. Therefore, the separator has become the core material to ensure the safe and stable operation of lithium ion batteries.

The electrolyte is to isolate the source of combustion, the separator is to increase the heat resistance temperature, and the sufficient heat dissipation is to reduce the battery temperature, to prevent excessive heat accumulation caused by battery thermal runaway. If the battery temperature rises sharply to 300 ℃, even if the separator does not melt and shrink, the electrolyte itself, the electrolyte and the positive and negative electrodes will undergo a strong chemical reaction, releasing gas, forming an internal high pressure and exploding, so a suitable heat dissipation method is used to Important.

Power lithium battery pack air cooling structure heat dissipation method

1. Install a cooling fan at one end of the battery pack and leave a vent hole at the other end to accelerate the flow of air between the gaps of the battery core and take away the high heat that occurs when the battery core works;

2. Add thermally conductive silicone gaskets on the top and bottom of the electrode end to allow the heat that is not easily dissipated from the top and bottom to be transferred to the metal shell through the TIF thermally conductive silicone sheet to dissipate heat. At the same time, the high electrical insulation and puncture resistance of the silicone sheet The group has a good protective purpose.

Cooling method of liquid cooling structure of power lithium battery pack

1. The heat of the battery cell is transferred to the liquid cooling tube through the thermally conductive silica gel sheet. The cooling fluid expands and contracts and the free circulation flows to take away the heat, so that the temperature of the entire battery pack is unified, and the powerful specific heat capacity of the cooling liquid absorbs the battery core. The heat makes the entire battery pack operate within a safe temperature.

2. The good insulation performance and high resilience of the thermal conductive silicone sheet can effectively prevent the vibration and friction damage between the batteries and the hidden danger of short circuit between the batteries, which is the best auxiliary material for the water cooling method.

Introduction of natural convection cooling method of power lithium battery pack

1. This type of battery pack has a large space and good contact with air. The exposed part can naturally exchange heat through the air, and the bottom part cannot naturally exchange heat through the radiator. The thermally conductive silicone sheet fills the gap between the radiator and the battery pack for heat conduction and shock absorption. ,insulation.

2. The heating sheet method is mostly used in the new energy vehicle market. The heat of the battery preheating heating sheet before startup transfers the heat to the battery pack through the thermally conductive silicone sheet. The preheated battery and the thermally conductive silicone sheet have good thermal conductivity and insulation performance. Wear resistance, can effectively transfer heat and protect against wear and short circuit caused by friction between the battery pack and the heating plate.

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