The train is afraid of cold and heat! If the temperature exceeds 38°C, the battery life will be lost by 31%!

Zheng Yi

2024-08-07 20:09Published in Shandong

It is reported that the driving distance of electric vehicles at low temperatures is usually reduced by more than 20% on average compared with normal temperatures. As a result, consumers considering buying an electric vehicle are often concerned about the driving distance in low temperatures. The results of the test show that even in the recent same period when the unexpected heat continued, the driving range of electric vehicles decreased significantly, so it is attracting attention.

Recurrent, a company specializing in EV battery range analysis, recently tested the impact of high-temperature environments on driving range in more than 7,500 electric vehicles. The test results showed a loss of only 2 to 5 percent of the driving distance below 32°C. In fact, it is the loss of driving distance caused by the operation of the air conditioning system.

The initial cooling of the air conditioning system of an electric vehicle uses 3~5kW of electricity. After that, the amount of electricity used to maintain the set temperature will be stabilized at around 1kW. The greater the temperature difference between the exterior and the interior of the vehicle, the more energy is used.

The result of only 2~5% loss of driving distance is largely due to the battery thermal management system installed in electric vehicles. The battery thermal management system detects the temperature of the battery cells installed in electric vehicles in real time and controls them if there is an abnormality. Thermal management is divided into air-cooled and water-cooled. As the name suggests, the temperature of the battery is regulated with air and cooling water.

The average operating temperature of electric vehicles announced by automobile manufacturers is 25~35°C. At this temperature, the battery charges the fastest and is the easiest to ensure the driving distance.

The problem lies in exceeding the optimal operating temperature of electric vehicles by more than 35°C. A sharp loss of driving distance occurred. At temperatures of 35°C and 38°C, the distance loss is 15% and 31%, respectively. Battery thermal management systems for electric vehicles also have limitations when it comes to optimal performance starting at 35°C

That's why the test institute advises: "In the heat of the day, turning on the air conditioner while charging, lowering the indoor temperature before setting off or stopping in the shade can help secure the driving distance." ”

View original image 23K

• 

• 

•