Power battery thermal management system function and battery overheating hazard

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

Overcooling and overheating can result in the performance of the dynamic lithium battery, so most of the low-temperature cells can heat up the battery in the ultra-low temperature environment. Instead, when the power lithium battery is placed at normal temperature, it is necessary to effectively Battery for thermal management. Therefore, it is necessary for the battery heat management system for electric vehicle vehicle power lithium battery system.

Reliable, efficient thermal management system is significant about electric vehicle vehicles. A) The dynamic lithium battery pack thermal management system has the following five important functions: 1) Accurate measurement and monitoring battery temperature. 2) Effective heat dissipation and ventilation when the battery pack temperature is too high.

3) Rapid heating under low temperature conditions. 4) Effective ventilation when harmful gases. 5) Ensure the uniform distribution of the battery pack temperature field.

2) Basic ways of heat transfer in the battery 1) The heat transfer method of the battery is important, and three ways to heat exchange heat and radiation heat exchange. 2) The heat of the battery and environmental exchange is also carried out by radiation, conduction and convection. Thermal radiation is important in the surface of the battery, and is related to the nature of the surface material of the battery.

3) Thermal conduction refers to the heat transfer that the substance is directly in contact with the object. The electrodes, electrolytes, current fluids, etc. of the battery are thermally conductive media, and the temperature and environmental thermal conductivity of the battery are used as a whole, the battery and the environmental interface layer determine the heat transfer in the environment.

4) The hot-backflow refers to the heat exchange heat of the surface of the battery through ambient medium (generally fluid), which is also proportional to the temperature difference. Regarding the inside of the monomer battery, the influence of heat radiation and thermal convection is small, and the transfer of heat is determined by heat transfer. The size of the battery itself is related to the specific heat capacity of its material, the greater the heat capacity, the more heat dissipation, the less temperature rise of the battery.

If the heat dissipation is greater than or equal to the heat of the occurrence, the battery temperature will not rise. If the heat dissipation is less than the heat of the occurrence, heat will occur in the battery, and the battery temperature increases. 3) Battery overheating or overcooling hazard 1) Reduce battery performance, when the battery temperature is too low or too high, can cause battery failure.

2) The thermal management of the accidental lithium battery that may occur after severe thermal aggregation is very important to the battery, directly affect the battery's battery life and service life.

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