China store can net dispatch: Close paragraph since time, home appears again and again incident of combustion of electric car on fire, the expert thinks, our country goes after batteries to compare energy density high is the main reason that causes on fire. Nevertheless, also the expert has different point of view, a few days ago, the reporter covered some batteries industry relevant expert, he tells a reporter, when producing event of electric car on fire every time, the relevant researcher of car and battery business can undertake comprehensive analysis certainly, he is one of researcher that participate in an analysis, and they are in the discovery after passing research for many times, the main reason of on fire of most electric car is absent batteries, and wrap in batteries.
■ the industry pays close attention to energy density generally
On August 31, 650 electric cars are in a Li Fan Guangzhou adds on fire of the city zone to burn; On September 10 midday 12 when the left and right sides, road of Jiang Bin of the Fuzhou City electric car is in a Biyadi after dash against roadside protects column spontaneous combustion; On September 5, be in Zhuhai sweet continent inside some parking lot, 100 series share two numerous Tai Yun the on fire when electric car is charging burns.
Also be not long ago on August 25, the power horse academy that is located in Chengdu inside garden area, electric car of EX5 of a power horse is abrupt on fire spontaneous combustion; Made an appointment with on August 26 18 when 22 minutes, general hand over to the collective or the state of city of hill of copper of the Anhui province manages a bus produces accident of on fire combustion suddenly in travel process.
Close paragraph since time, home produces accident of combustion of electric car on fire again and again, according to not complete count, this year since first half of the year, our country already produced event of electric car spontaneous combustion more than 10 cases, and basically be centered in dynamoelectric take the field that use a car, cent of these on fire car sail at stopping somewhere else condition, charging or in travel process.
Produce on fire accident again and again, some experts its ascribe industry too pursuit batteries compares energy density high. Before before long, yang Yusheng of academician of Chinese Academy of Engineering points out, batteries tall nickel is changed raised specific volume to measure, the temperature of hot out of control that also lets batteries and security drop stage by stage. Batteries of ion of 3 yuan of lithium heats up temperature of out of control to be not worth 200 ℃ , especially 3 yuan of material divide an explanation to give off when reaching constant temperature extremely lively first zoology oxygen, although be below the case that supplies without outside oxygen, batteries interior had combustion essential factor thoroughly, this also is ion of 3 yuan of lithium after batteries on fire, igneous situation spreads rapid and the reason that puts out hard.
Yang Yusheng thinks, because go after pure report motor-car one-sidedly,tall add sails course of development, the wind of the tall nickel of 3 yuan of material is blown more jump over intense. 3 yuan of batteries are time bomb probably, battery of lithium of phosphoric acid iron should be not buried. Still the expert thinks, from theoretic look, the security of 3 yuan of batteries under lithium of phosphoric acid iron, the content of the nickel in increasing 3 yuan of cell brings bigger safe hidden trouble necessarily.
■ flaw of batteries package design cannot be ignored
Tall nickel of 3 yuan of batteries changes the security that reduced batteries, but also Yangyu of no less than gives birth to a character, this is on fire of 3 yuan of batteries hind, igneous situation spreads rapid and the reason that puts out hard. So, what is the immediate cause that causes batteries on fire truly?
Afore-mentioned batteries industry experts tell " Chinese car signs up for " reporter, every time when electric car on fire, no matter be truckload,the battery business of enterprise or form a complete set takes seriously very much, metropolis clique understands a situation toward the spot before the technologist, and come to the car carry back after on fire tear open solution further, search the real reason of on fire. He tells a reporter, from the point of result of the analysis that tear open solution, great majority is dynamoelectric the reason of accident of car on fire is not batteries itself, because batteries includes all sorts of limitation,cause however. He says, a lot of blemish exist at the beginning of batteries surrounds a design, the existence of these blemish is buried played safe hidden trouble, after safe hidden trouble accumulates certain level, final meeting causes electric car on fire to burn.
Discover not hard, the great majority of accident of electric car on fire that produces recently is located in our country south, this and rainfall of large-scale of southern near future have bigger concern. This expert expresses, electric car has higher waterproof demand, if reach IP67 waterproof order and degree, the safety of electric car will have safeguard. If the waterproof grade of electric car did not achieve a requirement, after be being used for long, the waterproof effect of electric car is met somewhat abate, seeper of rainwater, road surface erode batteries system likely, bring about batteries to short-circuit thereby. This expert tells " Chinese car signs up for " reporter, the waterproof properties of electric car is abate the batteries short circuit that bring about is not to happen in batteries interior, produced short circuit in batteries bag however, cause combustion accident thereby.
So, why to promote the waterproof grade of batteries? This expert says, achieve higher waterproof order and degree to will increase the cost of electric car, weaken the price competition ability of the product. This expert gives " Chinese car signs up for " reporter citing says, wiring harness should be used in batteries, the price of the waterproof wiring harness that amount to mark is 1200 yuan about, and the price of common wiring harness is 500 yuan about, both price differs one times much.
"At present on the market, a0 or A00 class is dynamoelectric the value of the car is inferior, this and enterprise emphasize cost saving particularly have particular concern, but when the enterprise is emphasizing saving cost, the vigilance to safety meets the likelihood be loosened somewhat. " this expert says, still have a kind of case notable, some enterprises purchase personnel to differ wiring harness price too much reason ascribes to price of make a false report of company of form a complete set, and sales resistance is waterproof the wiring harness that amount to mark, the error on this kind of understanding also can cause batteries to include the limitation that when be being designed at the beginning, goes up with respect to existence safety.
Additional, develop to drive electric car, our country established higher subsidy level, in the center of with the place two class allowance all put forward add to sail course of development asks. Sail to satisfy add course of development asks, car company adopts two kinds of methods commonly, it is the energy density that increases cell (have quite tall technology difficulty) ; 2 it is much outfit batteries. "Much outfit batteries means cost to be able to rise, the product can lack market competition ability. Ensure to reach subsidy level cost does not promote considerably again, some enterprises are used loosen BMS (batteries includes the one share of the group) administrative method, but this means the safe canal that reduced batteries to accuse. Loosen BMS to ask hard to avoid brings safe hidden trouble, appear suddenly in BMS electric car on fire can be brought about to burn when the problem. " this expert says.
The data shows, in reason of flaming of electric car on fire, 70 ％ above is hot out of control. This expert tells " Chinese car signs up for " reporter, rarely the reason of batteries itself causes the hot out of control of batteries interior, below most circumstance, it is the hot out of control that exterior element caused batteries interior, and exterior element all has affinity with batteries bag. For instance, installation includes medium battery in batteries, can happen in travel process as a result of car shake those who cause cell produce clash, this kind of attrition looks be like very subtle, but accumulate over a long period produces qualitative change possibly, the batteries in bringing about batteries to wrap short-circuits. This expert tells " Chinese car signs up for " reporter, no matter why is car being planted inevitable meeting shakes below condition, of the batteries in bag of this pair of batteries fixed raised taller requirement, especially of columnar batteries fixed need to strengthen more.
■ the short circuit inside batteries also should take seriously
This expert tells a reporter, current, the on fire incident that the account that includes as a result of batteries causes holds great majority, but the problem that also having little share is batteries itself, of this and battery market non-standard about. He says, the concentration of cell of our country power is spent taller, the business market of before the rank 10 is had lead more than 80 ％ , these industry technology actual strength are stronger, and take batteries seriously produce quality. But our country has pool of about a hundred home appliance to produce a business, they seek their existent way in different fractionize domain, the product of company of some two galvanic pools still can flow into the market, the product of these enterprises may be put in the problem of electric core itself. For instance, the matter content in electric core is exorbitant, do not need exterior element to produce the short circuit inside batteries possibly, bring about batteries to heat up out of control thereby on fire burns.
"Of batteries inside short circuit cannot be ignored. " Mao Huanyu of president of limited company of cell of Suzhou world capacity says, "The opportunity that there is a lot of in batteries is being designed and making a process can stay inside the safe hidden trouble of short circuit, current technology still cannot be eliminated completely and prevent to appear inside short circuit, also cannot explore before accident happening. Although of batteries inside short circuit is small probability incident, but also cannot ignore, once happen inside short circuit will be disastrous. Once happen inside short circuit will be disastrous..
Mao Huanyu says: "Short circuit cannot be overcome inside, but the security that can take two measure to ensure batteries, it is the intensity that reduces hot out of control; 2 it is to install hot patulous protective screen. " to achieve this goal, suzhou eaves measures cell limited company to explore a precautionary measures that gave his: Through chemical method control reduces the response capabilities of batteries of hot out of control, setting heat delivers an obstacle to wait.
Current, batteries safety causes an industry to pay close attention to more and more, many domestic orgnaizations and enterprise also devote oneself to to study the security of batteries system. Gao Youyin of director of institute of physics of chromic chemistry of secretary of Party committee of research center of China is big strategy, ytterbium with respect to Ceng Xiang " Chinese car signs up for " the reporter revealed them to study positive result safely about system of batteries of dynamoelectric bus car. He says, this system is subsystem of a fire control was joined in batteries bag, there is control equipment of put out a fire inside, once batteries includes out of control of hair heat build-up, extinguishing system can be started quickly, avoid a harm to expand further thereby, ensure batteries system is safe.
In addition, the accident of electric car on fire that produces recently already caused labour to believe the height of the ministry to take seriously, company of production of car of specific requirement new energy resources develops safe hidden trouble immediately special platoon investigates the work. The expert points out, believe to be below the collective attention of all circles, car of new energy resources will be safer and safer.
