As car manufacturers continue to improve driving range to overcome drivers' mileage anxiety, the energy density of large batteries is gradually increasing, which means that the temperature monitoring function of the battery system needs to be improved. In order to ensure the service life of the battery and avoid thermal runaway of the battery, whether it is normal driving or fast charging, the heat dissipation strategy and overheating protection mechanism must be considered during the design of the battery system.
Generally, there are about 100 temperature measurement points in the battery system of a pure electric vehicle (BEV), and each measurement position symbolizes the battery temperature status in the area. The BMS collects the overall temperature distribution status and corrects the vehicle temperature control strategy in real time through the monitoring and judgment results of the BMS, such as: improving water cooling efficiency, limiting battery charging and discharging current, etc.
Due to the importance of combining the battery temperature control mechanism with the BMS, existing testing laboratories and battery manufacturers have put forward verification requirements for battery temperature control and BMS judgment mechanisms. During the test process, in addition to requiring the temperature measurement accuracy and temperature reading synchronization, it also has the detection function of real-time simulation of temperature control changes when the temperature changes. The 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-level software Battery Pro performs real-time judgment and command transmission, so as to adjust the charging and discharging parameters and control the set values of external devices (such as temperature box, chiller) in real time during the test. Through the above temperature control simulation function, the battery test method is closer to the driving conditions of the whole vehicle, simulating the actual use environment temperature and the operation of the heat dissipation mechanism.
The 17020 and 17040 energy recovery battery module test systems are equipped with Battery Pro software for battery charging and discharging tests, which has the following functions:
(1) Built-in standard test programs for multiple batteries (such as: IEC61960 DCIR, IEC62391, IEC 60896, HPPC, etc.)
(2) It has the functions of test program editing and automatic cycle test, which can simulate actual driving conditions.
(3) Can integrate multiple instruments (such as CAN Device, data recorder, etc.) and equipment (such as temperature control box, ice machine, switching fixture, etc.)
