Today, battery technology is still developing, but the emergence of technical breakthroughs is not easy, can improve the performance of electric vehicles from other aspects or to see the battery heating, Xiaobian take you to continue to understand.

This is why foreign giants will look at the water heater in the reason.

Look at the development of domestic electric vehicle heaters.

First of all, good genes. The current heating system of all fuel vehicles is a water heater, and the working process of the two is the same, but the heat source of the engine is replaced with a PTC water heater, and this inheritance relationship can save the cost of converting the existing model into an electric vehicle. And the effect is similar.

The second is the advantage of BMS, with PTC water heater, you can spread the waterway into the battery box, one can be insulated in winter, and the other can dissipate heat in summer. Because of the special road conditions in most cities in the country in the summer, you know, so waterproof is a very important thing. The battery needs heat dissipation in summer and heating in winter, and this contradiction can be solved by water heating.

Then there are security considerations and layout. PTC water heater, because through the water flow through the evaporator to dissipate heat, it does not need to be crammed into the air conditioning assembly, can be installed in other locations, and domestic and foreign technology also began to want to lightweight, miniaturization, intelligent development. As for safety, the PTC heater is moved out of the air conditioning assembly, there is no danger of melting the air duct, the temperature of the antifreeze is the water temperature said before, it has a boiling point, that is, natural temperature protection. PTC water heater has good protection ability, temperature control and mechanical protection and program control double insurance, safety is naturally at a higher level.

For a variety of reasons, PTC air heaters are mainly used in China. As for the PTC water heater, Taizhou Decheng Electric Appliance Co., Ltd. has been independently developed, the product has been upgraded to the fourth generation, and has also begun to contact with domestic large car companies, and further develop the latest products suitable for lead-acid electric vehicles.

Either way, it generates heat by passing current into a large resistance, so it consumes more power. Therefore, various manufacturers are taking various countermeasures. For example, i-MiEV sets the "MAX" switch on the air conditioner. If this button is not pressed, the cooling and heating air conditioning will not operate at full capacity, thus reducing power consumption.

Despite various countermeasures taken by manufacturers, the driving distance of electric vehicles using heating and air conditioning will still be greatly reduced. For example, the i-MiEV can travel up to 120km in urban areas without air conditioning, drop to 100km when using cooling air conditioning, and drop to 80km when using heating air conditioning.

If the driving distance of heating and air conditioning is reduced to half, then to drive the same distance as without air conditioning, either double the energy density of the battery or increase the heating efficiency of the heater. With the same value as doubling the energy density of the battery, isn't the electric vehicle heater an important development topic?

By the way, when I suggested to the technicians of the car manufacturers that they could use heat pumps to save money, the answer was that the heaters were "simply not available" in the cold areas where they were most needed. Are you willing to challenge the development of new heaters?