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Battery manufacturer’s thermal management

Return Listsource:Gratene date: 2022-06-17

Battery manufacturer's thermal managementBattery manufacturers In battery manufacturing, thermal management is a working method, that is, to a particular engineering design, in the design, it should be kept in a certain temperature range in a certain temperature range. Typically, the battery has a maximum operating temperature indicator, above this temperature, and the speed of battery material is corrosive and other irreversible destructive side reactions. In addition, the battery has a minimum operating temperature. The electrolyte is high in the electrolyte below this temperature, or is easy to change – this is especially important for high temperature batteries.

The heat generated or absorbed by the electrochemical cell is determined by the following factors: first is the thermodynamic parameters of the battery reaction, followed by an overvoltage, efficiency and battery internal resistance of the electrode reaction process. Thermodynamic parameters are generally a simple function of charging state and temperature, while overvoltage, efficiency, and battery internal resistance are related to many variables (including the history of the battery).

Large batteries (i.e., a low surface volume ratio of batteries) under high magnification charge and discharge, overheating problem is the most common problem. The thermal energy generated by the battery can be emitted to the environment by the following method: natural air convection (to increase the heat sink, heat dissipation tank and distance) of the battery; use a heat exchanger with circulating gas or liquid coolant; use the pump to drive the electrolyte by An additional cooling unit.
The energy of the battery can cause an increase in the temperature of the battery. The continuous rated power level of the battery should be determined as the rated power when the steady state temperature of the battery does not exceed the maximum operating temperature.

The thermal management problem of high temperature batteries is more complicated. First, there is a need to have a heating system to raise the battery temperature to reach the operating temperature or maintain this temperature when the no current is passed; second, there is a thermostat to minimize heat loss, and improve total energy efficiency; In the high-band rate operation, there must be a cooling system to avoid overheating.

As people’s increasing attention to drive type and load level batteries, the research of thermal exchange analysis model is increasingly important. Once its thermal characteristics (heat capacity, heat transfer, etc.) can be used, many mathematical models can be used to analyze the temperature distribution during different working periods. 


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