Brief introduction about new energy battery thermal management

         Nowadays, the development of new energy vehicles has become one of the research hotspots in the field of automobile industry. Next, new energy batteries deserve special attention as the hardest part in the development of new energy vehicles. New energy batteries are exposed to high temperatures, and the over temperature of new energy batteries affects the performance, safety and even the life of the new energy battery systems. Therefore, the design of new energy battery cooling system is very important. This article discusses the design scheme of new energy battery cooling system and its related solutions.

       New energy battery cooling systems are divided into two models. The first type is air cooled, and the second type is liquid cooling . Air cooling system is the simplest and cheapest in equipment, with passive cooling and active cooling solutions. The passive cooling system does not need additional energy, relying on ventilation and other natural convection cooling methods, such as forced convection. Active cooling systems use cooling fans and other special cooling methods, such as phase change, to achieve the cooling desired temperature. However, due to the limited thermal cooling capacity of air, this is only applicable to small-scale new energy battery cooling.

       The liquid cold system is composed of coolant, circulation pumps and radiators, which can transfer the heat of the battery through the coolant and realize the cooling of the battery. In addition, the water cooling system is mainly used in large scale of new energy battery, and it has higher cooling performance than the air cooling system.  Thus, the key points of the design of new energy battery cooling system are summarized as follows:

1. Determine the type and number of batteries according to the power requirements of the new energy vehicle.

2. Calculate the working temperature range of the battery, and select an appropriate cooling system according to the working temperature range.

3. For batteries with an operating temperature range of 25-45 ℃, an air-cooled cooling system is chosen.

4. For batteries with an operating temperature range of more than 45 ℃, a water-cooled cooling system is selected.

5. A suitable cooling equipment (passive cooling or active cooling) is selected according to the actual cooling conditions.

The advantages of new energy battery cooling system are as follows:

1. Low cost. Since the new energy battery cooling system does not need additional energy, it can achieve significant savings in energy and costs.

2. Easy to match. The cooling system can match suitable cooling device according to the actual cooling needs, and can also be used in different electric vehicles.

3. Easy maintenance. The cooling system has a simple structure, reducing the workload of maintenance.

Conclusion

       In conclusion, an appropriate solution is necessary for the thermal solution  of the new energy battery cooling system. First, the type, quantity and temperature data of the new energy battery are determined and analyzed. Then, based on the cooling method, the structure shape of the cooling system is determined. Finally, a suitable cooling equipment is selected. According to the above analysis, the new energy battery cooling system discussed in this article can achieve the purpose of energy and cost savings and be easy to maintain.