Solve the safety problems of electric vehicles -Lithium - Ion Battery Equipment

How to solve the safety problems of electric vehicles -Lithium - Ion Battery Equipment

By the end of last year, the ownership of new energy vehicles in China had exceeded 1.6 million, accounting for 50% of the global ownership of new energy vehicles. This year's sales of more than one million should not be a problem. At the same time, the safety of new energy vehicles has become increasingly prominent, especially the fire incident has received extensive attention.

On October 31, the person in charge of the Quality Development Bureau of the State Administration of Market Supervision answered a reporter's question and said that according to the public opinion information, more than 40 new energy vehicle fires had occurred in 2018. The State Administration of Market Supervision has organized the Defective Product Management Center to launch 10 new energy vehicle defect investigations, carry out five on-site fire accident investigations with relevant departments, and urge relevant manufacturers to implement five recalls.

Among them, the recall involved 35600 defective vehicles of 24 models from 5 enterprises, most of which were caused by electronic control and mechanical failures. However, the State Administration of Market Supervision did not disclose who the five enterprises involved in the recall were, nor did it give specific recall models and the reasons for the defects.

The State Administration of Market Supervision said that since vehicle fire accidents may be related to electrical circuits, fuel cells, mechanical interference, external fire sources and other factors, and part of the evidence will disappear or change in the combustion process, it is very difficult to investigate defects and the cause analysis is extremely complex. However, the State Administration of Market Supervision will continue to carry out special investigation on fire accidents of new energy vehicles, carry out research on information sharing mechanism, further improve defect determination technology and ability, and strengthen recall supervision.(Lithium - Ion Battery Equipment)

Battery safety is the shortest board of the barrel

there were more than 40 new energy vehicle fires in China. Unlike fuel vehicle fires, which were mainly caused by aging of fuel lines and electrical short circuits, pure electric vehicle fires were largely caused by the power batteries carried. The main reasons were lack of experience in battery product testing and low level of charging safety management technology.

It can be said that the battery has become the bottom line of the safety of new energy vehicles. How to ensure the safety of the power battery system has changed under the premise of pursuing high endurance.

Industry experts said that the reason why electric vehicles caught fire frequently this year compared with previous years is that some enterprises began to reduce production standards in order to get subsidies as soon as possible. At the same time, many enterprises did not establish internal battery safety testing standards and battery safety testing capabilities, which led to the poor quality of the produced batteries and ultimately led to vehicle safety accidents.

Anyone who knows the working principle of the electric vehicle battery system knows that the basic component of the power battery is the battery cell, and the battery cells will eventually form a pack pack in groups. During the working process, a large amount of heat will be generated in the battery pack. If the heat cannot be dissipated in time, it will not only affect the life of the power battery, but also lead to thermal runaway in serious cases, leading to vehicle fires and other accidents.

In short, the thermal runaway is mainly caused by external and internal causes. The external cause is mainly due to the deformation of the lithium battery under the action of external forces when the vehicle is in a passive collision, which causes the battery diaphragm to be torn and short circuited, and finally causes a fire. The battery is overcharged mainly due to the defects of the electric control system and heat dissipation design, and the excessive local heat will also lead to the final short circuit and fire of the battery.

In fact, the prevention of battery thermal runaway needs to be considered from the basic to the overall system, involving material thermal stability, battery life cycle thermal safety, BMS thermal management and other aspects. For battery enterprises and vehicle enterprises, there are certain technical challenges.

The battery industry is accelerating the shuffle and elimination

The hot new energy vehicle market is a double-edged sword for power battery. On the one hand, it gives power battery enterprises unprecedented opportunities for development, and on the other hand, it relentlessly squeezes power batteries, requiring that the energy density of power batteries continue to increase, the range continues to increase, but the price continues to fall. 



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