There are two types of heat dissipation for ternary lithium-ion battery packs: active and passive, with significant differences in efficiency between the two. Passive systems require lower costs and simpler measures. Active systems are more complex in structure and require greater additional power, but their thermal management is more effective.
1. Install a cooling fan at one end of the ternary lithium-ion battery pack and leave a ventilation hole at the other end to accelerate airflow between the cells and carry away the high heat generated during cell operation;
2. Add thermally conductive silicone pads to the top and bottom of the electrode terminals. This allows heat that is difficult to dissipate from the top and bottom to be conducted to the metal casing for heat dissipation through the TIF thermally conductive silicone pads. At the same time, the high electrical insulation and puncture resistance of the silicone pads provide excellent protection for the battery pack.
◆Liquid cooling structure for power lithium-ion battery packs
1. The heat from the battery cell is transferred to the liquid cooling pipe through the thermally conductive silicone pad. The heat is carried away by the free circulation of the coolant due to thermal expansion and contraction, so that the temperature of the entire battery pack is uniform. The strong specific heat capacity of the coolant absorbs the heat generated when the battery cell is working, so that the entire battery pack operates within a safe temperature range.
2. The excellent insulation properties and high resilience of the thermally conductive silicone sheet can effectively prevent vibration and friction damage between battery cells and the risk of short circuits between battery cells, making it the best auxiliary material for water cooling methods.
◆Natural convection cooling method for power lithium battery packs
1. This type of ternary lithium-ion battery pack has a large space and good contact with air. The exposed parts can exchange heat naturally with the air, while the bottom parts that cannot exchange heat naturally are cooled by a heat sink. Thermally conductive silicone pads fill the gap between the heat sink and the battery pack, providing heat conduction, shock absorption, and insulation.
2. The heating element method is widely used in the new energy vehicle market. Before starting the battery, the heat from the heating element is transferred to the lithium-ion battery pack through the thermally conductive silicone sheet. The preheating battery and the thermally conductive silicone sheet have good thermal conductivity, insulation, and wear resistance, which can effectively transfer heat and protect against wear and short circuits caused by friction between the ternary lithium-ion battery pack and the heating element.
A major drawback of ternary lithium-ion batteries is their low ignition point when subjected to impact or high temperatures. Therefore, ternary lithium-ion batteries require stringent protection measures to prevent accidents. As the energy source for electric vehicles, lithium-ion batteries are the most critical component, directly impacting the performance of the electric vehicle.
