Bus ternary lithium battery access door or re-open.
Recently, the Ministry of Industry in the new energy vehicle safety supervision work conference that since January 1, 2017, in the third-party test report after the pay, ternary battery bus can apply for a new "new energy vehicles to promote the application recommended models directory ". This position is interpreted as a ternary lithium battery in the bus application from January 1, 2017 will be lifted.
"From the policy level, this is not an official document." A bus company technical person in charge of NBD car (micro signal: NBD-AUTO) interview, "for ternary lithium battery, most bus companies have Technical reserves, but based on security considerations, many car prices are still in a wait state, the short term will not apply for lithium battery bus into the promotion directory.
NBD car learned that it is out of the power battery safety considerations, early this year, the Ministry of Industry and equipment industry Secretary Zhang Xiang wood made it clear that the suspension of lithium batteries included in the new energy vehicles to promote the application of recommended vehicle catalog. At the time, the news caused a huge controversy.
The ternary lithium battery on the latest official statement, although no longer dead-cell battery technology line is regarded as good news, but the current car prices and the attitude of the battery manufacturers, ternary lithium batteries on a large scale bus still "Long way is long".
"Careful use of ternary lithium battery"
In fact, although the ternary lithium battery has a high energy density, life mileage and other advantages, but for its security risks have always been questioned the sound of doubt.
The end of January this year, the State Ministry of Industry and equipment industry, Zhang Xiang, director of the Department of Electric vehicles in China, said a hundred people in the current security standard system, the ternary lithium battery bus before the completion of the risk assessment, the suspension of lithium batteries included in the new three- Energy vehicles to promote the use of recommended models directory, the main consideration is out of security issues.
NBD car learned that, compared to ternary materials, lithium iron phosphate heat stability is better, will occur at 700 ℃ decomposition, even if the decomposition will not release oxygen, the fire is relatively easy to be extinguished. The ternary material thermal stability is poor, at about 200 ℃ outside temperature will decompose and release oxygen, once the fire will be in a very short period of time deflagration.
Last year, the end of December Hong Kong brand electric bus fire explosion, is a typical example. Coupled with the previous Tesla occurred several fire events (although the main reason is not caused by ternary lithium batteries), are so many people in the industry with three-cell lithium battery, said the battery system questioned.
National "863" energy-saving and new energy vehicles major project expert group leader Ouyang Ming higher industry insiders have publicly stated that for buses, especially 12-meter-long bus, once a security incident, it is difficult to make all passengers escape , So the use of higher safety and relatively slow fire speed lithium iron phosphate batteries, lithium batteries more than ternary.
"Therefore, from the security point of view, in the application of passenger cars, ternary lithium battery will not be fully liberalized." Above bus company technical director bluntly, in fact, from the relevant ministries and industry experts in the position can be learned that the more Biased in favor of bus enterprises to use lithium iron phosphate batteries, lithium batteries for the ternary attitude is "prudent use."
Enterprises more than wait-and-see attitude
It is for security considerations, the Ministry of Industry has also set a low threshold for the lifting of the ban. It is reported that bus companies in the application must also meet the new "electric bus safety conditions" (hereinafter referred to as "conditions").
In this regard, an industry source told NBD cars, ternary lithium batteries to achieve this "condition" of the relevant security standards is very difficult. One of the "battery cell thermal runaway test" and "rechargeable energy storage system thermal runaway expansion test" and other test requirements for the ternary lithium battery, are no small challenge.
"Therefore, most of the car prices will not apply for a short term lithium battery bus to enter the promotion list." Bus company executives said that even if the final form of official documents to introduce the lifting of the ban policy, from the market side, companies are Wait and see.
"Customers for the use of ternary lithium battery electric bus safety skeptical, so most car prices, with the size of the bus factory not to 'eat the first crab', the current general practice is: do a good job of technical preparation, But will not go to declare. "The bus company official said.
It is noteworthy that, in fact, the wait-and-see attitude is not just bus companies. NBD car learned that many of the battery manufacturers are also waiting for the policy more clear.
A battery business-related responsible person told NBD car, "Although we have ternary lithium battery technology has long been reserves, but lithium iron phosphate is still the main force, its production capacity is triple lithium battery twice."
Data show that the current production of electric buses in China, the lithium iron phosphate battery market share of about 60%, ternary materials accounted for three percent of the battery market share. Some analysts predict that by 2018, ternary battery shipments will catch up with lithium iron phosphate batteries.
"As far as we are concerned, is expected to 2018, ternary lithium battery capacity will gradually over lithium iron phosphate, then there will be a small outbreak period." Above the battery business-related official said that although the ternary lithium battery is The general trend, but not yet established in the current bus safety norms of the background, the battery manufacturers will still be biased in favor of lithium iron phosphate production capacity.
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