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In recent years, with the rapid development of electric vehicles, how to solve the safety problems caused by electric vehicles has become a new topic and difficulty in the automotive industry. Since people have a process of recognizing new things, they will inevitably have an attitude of suspicion and distrust in the early stage. Therefore, any safety accident related to electric vehicles will further deepen the public's doubts about the safety of electric vehicles and hinder the development of electric vehicles. development and popularization.
In fact, many vehicle fire accidents caused by collisions or spontaneous combustion of traditional fuel vehicles occur around the world every year, resulting in many serious casualties. This does not cause widespread public concern and questioning. The reason why the public is so sensitive to safety accidents of electric vehicles is that in addition to the fact that when an electric vehicle accident occurs, it is usually accompanied by "special effects such as fire, sound, light, smoke, etc.", a very important reason is because of the fear of high-energy carrier "batteries". . There have been cases of mobile phone batteries catching fire and exploding, injuring or even killing people, not to mention such a huge electric vehicle power battery?
Electric vehicles (including hybrid vehicles) have many similarities with traditional fuel vehicles, but also have some differences. There is basically no difference in their operating conditions, usage environment, body structure, internal and external styling, etc. The biggest difference lies in the driving method and energy source. Because of the introduction of electric drive, there are risks such as "electric shock" and "short circuit". Because of the presence of high-energy carriers, there are risks of fire and explosion caused by the instantaneous release of energy (obviously not what we expect). Because of the stability issues of the chemical battery itself, it will bring many risks beyond people's "traditional understanding."
New things are always fragile and subject to all kinds of doubts, let alone vehicles that are closely related to personal safety? I think there are only a few people who are willing to risk their lives to try and accept unreliable and unsafe products. Therefore, whether it is national-level regulations and standards, or corporate-level product and technology research and development, we must be people-oriented, effectively solve product risks and hidden dangers, and eliminate public doubts, thereby promoting the development of new energy vehicles. We have no reason to use immature and unreliable products to deceive the public and consumers and serve the private interests of enterprises or individuals. The safety factors of power batteries will be analyzed in detail from various parameters of power batteries below.
1. Composition of power battery system
As the power source of electric vehicles, or one of the power sources, the power battery system usually consists of cells (Cell), battery management system (BMS), cooling system (Cooling system), wiring harness (Harness), housing (Housing), structural parts ( mechanical parts) and other related components, as shown in the figure below:
Power battery system composition
Nissan leaf power battery system
It can be seen that the composition of the power battery system is still quite complex. It includes chemical objects such as battery cells, complex electronic and electrical systems and thermal management systems, as well as various traditional mechanical components. The types of professionals involved are very wide. Coupled with the harsh operating environment, the security risks faced are also extensive.
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