How to Simulate and Test The Temperature Control Mechanism of EV Battery System?

As car manufacturers continue to improve endurance to overcome the driver's mileage anxiety, the energy density of the large batteries onboard has gradually increased, which means that the temperature monitoring function of the battery system needs to be more perfect. In order to ensure the service life of the battery and avoid battery thermal runaway, whether it is under normal driving or fast charging, the design of the battery system needs to consider the heat dissipation strategy and overheating protection mechanism.

Generally, the battery system of a pure electric vehicle (BEV) has about 100 temperature measurement points, and each measurement position represents the battery temperature status in this area. The overall temperature distribution status is collected by BMS, and monitored and judged by BMS As a result, the vehicle's temperature control strategy can be revised in real time, such as improving water cooling efficiency and limiting battery charge and discharge current.

Because of the importance of the combination of battery temperature control mechanism and BMS, existing testing laboratories and battery manufacturers have proposed verification requirements for battery temperature control and BMS judgment mechanisms. In the test process, in addition to requiring temperature measurement accuracy and temperature reading synchronization, it also has a detection function that can simulate temperature control changes in real time when the temperature changes. In this regard, APM`s battery test system can obtain the internal and external temperature values of the object under test through CAN Device or Data logger, and then the upper software Battery Pro software makes real-time judgment and command transmission, which can adjust the charge in real time during the test. Discharge parameters, and control external equipment (such as: thermostat, chiller) set value. With the above temperature control simulation function, the battery testing method is closer to the driving conditions of the vehicle, and the operation of the actual use environment temperature and heat dissipation mechanism is simulated. APM's flexibly programmable battery testing system has been successfully adopted by well-known national testing organizations in the industry.

APM has more than 20 years of experience in the field of precision measuring instruments and is the leader of automatic test systems, specializing in various power electronics related test applications. In response to the development trend of new energy, it has also actively invested in electric vehicles, energy storage system testing and other industries to provide a full range of solutions.