Fire hazards force the car to recall lithium battery safety and become the focus again

[ Focus on Chemical Machinery and Equipment Network ] Recently, due to the potential fire hazard of lithium batteries, General Motors announced the recall of approximately 69,000 Chevrolet Bolt electric vehicles within the scope.
The lithium batteries used in the recalled models are all from South Korea's LG Chem.
This is not the first car recall that occurred this year due to the hidden fire hazards of Korean lithium batteries.
Prior to this, Ford, Hyundai and BMW also recalled some models of electric vehicles.
Among them, the lithium battery supplier of Ford and Hyundai recalled cars is also LG Chem, while the supplier of BMW is Samsung SDI.
So far, more than 200,000 vehicles have been recalled or discontinued by automakers in these four major worlds.
While causing economic losses, lithium battery safety has once again become the focus of public attention.

 

With the increasing pressure on the environment from warming, the development of new energy vehicles as an effective way to reduce carbon emissions is being promoted by more and more countries and regions.
In recent years, the new energy vehicle market has developed particularly rapidly.
In 2018, the annual sales volume of new energy vehicles has exceeded 2 million.
my country is the main market for new energy vehicles, accounting for more than half of the market.
Although affected by the epidemic this year, sales have not performed well, but * from the perspective of the relevant policies, my country's new energy vehicle market still has great potential for development.
Therefore, the safety of lithium batteries is particularly important.
Lithium battery technology is the foundation of new energy vehicles.
If it cannot solve the problem of potential fire hazards, it will inevitably affect the further promotion of new energy vehicles.

 

　　Since the application of lithium batteries, the shadow of spontaneous combustion has not disappeared.
Whether it is from electric bicycles or electric vehicles, there are more and more news about the spontaneous combustion of vehicles due to lithium battery problems.
The working principle of the lithium battery and its internal structure determine that its safety problems are almost unavoidable.
With the increasing requirements of application requirements for battery capacity, the consequences of accidents have become more and more serious.
In order to reduce the occurrence of accidents in lithium batteries, firstly, it is necessary to further develop lithium battery technology, and secondly, it is necessary to more strictly control the quality of lithium batteries.

 

　　At present, the lithium battery technology used in new energy vehicles is still not perfect.
In addition to the risk of fire, there is no better solution to the problem of battery loss.
In general, if new energy vehicles want to replace fuel vehicles, they still need to go a long way in terms of technology.
Technically solving the fire problem cannot see a significant effect in the short term.
Strengthening product quality management has become an urgent need for lithium battery companies and related departments at this stage.
In fact, the fire risk of lithium batteries is not as high as people think.
In terms of the statistical probability of 10,000 car fire accidents, the probability of new energy vehicles is lower than that of fuel vehicles.
Therefore, as long as the product quality is qualified, the spontaneous combustion risk of new energy vehicles is within an acceptable range.

 

　　Lithium battery testing includes battery material testing, performance testing and safety testing.
The quality of materials not only affects battery performance, but also affects safety.
Material testing includes the specific surface area, tap density, particle size analysis of the positive and negative electrodes, the conductivity, density, acidity, etc.
of the electrolyte, and the permeability, porosity, and tensile testing of the diaphragm.
Commonly used instruments include tap density tester, laser particle size analyzer, atomic absorption spectroscopy and so on.
Safety tests include short circuit, abnormal charging, forced discharge test, squeeze, impact, shock, vibration, heat abuse and other test items.
Lithium batteries are required to not leak, exhaust, burn or explode during the test.
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Therefore, the safety of the tested lithium battery products is guaranteed to a certain extent.

 

　　The ever-increasing potential fire hazards of lithium batteries and the growing lithium battery market have given the lithium battery testing industry a larger market and higher requirements for testing technology.
The popularization of new energy vehicles is the general trend, and the lithium battery testing industry also has a good market prospect.
The wind has blown, and the lithium battery testing industry will also achieve greater development.

 

　　Original title: Fire hazards force the car to recall lithium battery safety and become the focus again