New Energy Power Battery Thermal Management
Power battery as the main power source of new energy vehicles, its importance to new energy vehicles is self-evident. In the actual use of the vehicle, the battery will face the use of complex and variable conditions.
In low temperature, the lithium-ion battery will increase the internal resistance, capacity becomes smaller phenomenon, the extreme case will lead to electrolyte freezing, battery can not discharge and other situations, the battery system low temperature performance is greatly affected, resulting in electric vehicle power output performance decay and range reduction.
When charging new energy vehicles under low temperature conditions, the BMS generally heats the battery to a suitable temperature before charging. If not handled properly, it will lead to instantaneous voltage overcharge, causing internal short circuit and further risk of smoke, fire or even explosion.
At high temperature, if the charger control fails, it may trigger a violent chemical reaction inside the battery, generating a large amount of heat, and if the heat is too late to dissipate and accumulates rapidly inside the battery, the battery may leak, outgas, smoke, etc. In serious cases, the battery will burn violently and explode.
Battery Thermal Management System (BTMS) is the main function of the battery management system, the thermal management of the battery mainly includes cooling, heating and temperature equalization functions. Cooling and heating functions are mainly for the external environment temperature on the battery may cause the impact to make corresponding adjustments. Temperature equalization is used to reduce the temperature difference inside the battery pack and prevent the rapid decay caused by overheating of a certain part of the battery. Through the heat-conducting medium, measurement and control unit and temperature control equipment to form a closed-loop regulation system, the power battery works within the appropriate temperature range to maintain its optimal operating condition, which is used to ensure the performance and life of the battery system.
