Dai Kangwei, Beiqi New Energy, chats: Where did the battery life in winter go?

[car home? New energy]? Winter is a nightmare for pure electric vehicle owners, because low temperature is the "natural enemy" of pure electric vehicle endurance. A few years ago, when pure electric vehicles just sprouted, the technology of various parts of the vehicle was not mature enough. There are many "jokes" of pure electric vehicle owners on the Internet, such as unwilling to turn on the air conditioner in winter and wearing gloves and hats when driving. Nowadays, pure electric vehicles are becoming more and more popular, with mature technology and continuous improvement of endurance. However, one question still haunts the minds of many users: Where did the battery life in winter go?

This activity is in ARCFOX? The space polar fox space was held, and the speaker was Dai Kangwei, the leader/vice president of Beiqi New Energy Third Power Research Institute. In my impression, the expert who studies pure electric vehicle technology should be a bald and slightly greasy middle-aged man? I didn't expect the acting dean to be a very capable woman worker. I'm curious about her experience with pure electric vehicles. Where does she think the battery life in winter has gone? Does she have a solution?

In 2008, Acting Dean joined BAIC New Energy. At that time, the pure electric vehicle industry in China was still in its infancy, and we didn't have very mature products, supporting industries and thin technology. For ordinary consumers, in 2008, we hardly understood the concepts of "new energy vehicles" and "pure electric vehicles". She also shared that at that time, there were very few automobile-grade parts for pure electric vehicles, and even she had found a partner of industrial motors, hoping that the two sides would cooperate to develop automobile-grade power systems; As for the blank parts of pure electric vehicle controller and other technologies, we will develop them from scratch. In the words of the acting dean, at that time, making pure electric vehicles began with "moving cars".

Acting Dean has almost experienced the development process of pure electric vehicle technology. When she first entered the pure electric cycle, we were making "dynamic" cars. Now, ARCFOX has first-class partners in Magna, Huawei and other industries. ARCFOX？ αT was born in BAIC Blue Valley Magna Intelligent Manufacturing Base, which is Magna's first vehicle manufacturing base outside Europe. This paper introduces MAFACT manufacturing standard system of Magna, and improves product quality from two aspects of management mechanism and quality control. At the same time, the cooperation between ARCFOX and Huawei includes 5G, vehicle communication, autonomous driving, chips, software, cloud and human-computer interaction. The two sides also established the "1873 Davidson Innovation Lab" on 20 18, aiming at creating "the next generation of world-class intelligent networked electric vehicle technology".

Although the technology of pure electric vehicles is developed and the industry is relatively mature, as we said at the beginning, how to solve the battery life attenuation of pure electric vehicles at low temperature is still a concern of everyone. To know how to solve the problem, we must first understand the cause of the problem. In the view of the acting dean, improving the winter life of pure electric vehicles cannot be solved by optimizing one or two aspects.

According to our impression, the chemical characteristics of the battery itself are one of the important reasons for the decline of battery life in winter. Just as the mobile phone battery is not durable in winter, the viscosity of the electrolyte of the pure electric vehicle power battery will increase at low temperature, and the migration rate of lithium ions and the conductivity of the anode and cathode materials themselves will deteriorate. Simply put, low temperature makes the battery activity worse, which is reflected in the pure electric vehicle, that is, it can not release the electricity well and the battery life is attenuated.

In addition, in order to improve the endurance of pure electric vehicles in winter, it is not enough to optimize the power battery only. The efficiency of the whole vehicle includes the efficiency integration and matching between many different parts, and all aspects must be optimized and coordinated to achieve an efficient goal. For example, in the air conditioning system, the warm air heat of traditional fuel vehicles comes from engine preheating, while pure electric vehicles rely on a new heating source.

Up to now, many pure electric vehicles are still using PTC air conditioners. The principle of this air conditioner is very simple. You can think of it as "heating quickly" and "thermistor". PTC air conditioner has a good heating effect, but the disadvantage is that it consumes a lot of electricity. However, with the development of technology, PTC air conditioning has gradually evolved from the previous air heating scheme to the water heating scheme, which can use part of the motor to dissipate heat with less heat loss. Later, some models adopted heat pump air conditioning technology, which can absorb heat from the environment and enter the heat pump system. In addition, the integrated design of cooling and heating can also improve efficiency. In the previous winter laboratory, we had the experience of heat pump air conditioning with good efficiency in not too cold environment.

ARCFOX is more than that. According to the acting dean, developers are still developing and calibrating a heat pump air conditioner with carbon dioxide heat management system, with the aim of reducing the loss of air conditioners. How efficient is this carbon dioxide heat pump air conditioner? When can mass production get on the bus? ARCFOX polar fox may reveal the answer for us in the spring of 202 1. In short, improving the endurance of pure electric vehicles in winter is a work involving many contents. In addition to the optimization of air conditioning system, the acting dean also talked about many other factors, such as tires, resistance of transmission system at low temperature and so on. In order to realize the comprehensive optimization of the winter car experience, ARCFOX also thought a lot.

Or around improving the endurance or optimizing the car experience, share on behalf of the dean that their ongoing winter test not only includes the calibration and research of the new generation air conditioning system, for example, how to optimize and adjust the vehicle thermal management system? How to strengthen the thermal insulation at the bottom of the battery pack (make the battery pack freeze)? How to further improve the winter kinetic energy recovery efficiency of pure electric vehicles under the premise of ensuring driving experience and driving safety on ice and snow roads? How to make the battery reach the ideal temperature before the user charges? Can you make a battery rapid heating technology with safety control means?

In just a few years, we upgraded from BAIC New Energy E 150EV with NEDC cruising range of only 150km to BAIC New Energy with NEDC cruising range of 653km. Extremely fox Alpha T(ARCFOX？ αT), during this period, we have seen the technological progress of pure electric vehicles in China, but during this period, the efforts made by R&D personnel in the pure electric vehicle industry in China are unknown to most of us. There are many factors that affect the endurance of pure electric vehicles in winter, but I believe that with the efforts of outstanding researchers such as acting dean, "pure electric vehicles are not afraid of winter" is just around the corner. (Text/car home? You Dong Qing)