What do you think is most important for a car? Some people value the power of the car the most, and some people prefer the unique appearance. But for electric vehicles, the most important thing is safety. With the continuous heating up of sales of new energy vehicles, the spontaneous combustion of electric vehicles has become very frequent in recent years. Unlike fuel vehicles, once a new energy vehicle catches fire, the whole vehicle will be scrapped in a short period of time, so the safety of the battery is particularly important. As the first electric vehicle of GAC Mitsubishi, Mitsubishi naturally understands this, so soon after the listing of GAC-Mitsubishi Atuka, they came to a national standard test of the hardcore e-fun laboratory.
As expected, GAC Mitsubishi Atuka successfully passed the first test of the national standard, and the manufacturer used this to prove product safety. However, if you are a little more careful, you will find that this model does not do the acupuncture experiment that is generally interested in consumers. Is acupuncture so important? That's for sure!
What exactly is the acupuncture experiment?
As we all know, the battery cell of the new energy vehicle is very delicate, and the battery pack may rupture because of the bottom during daily driving, or it will be punctured by other metal parts when a traffic accident occurs, so that the battery will appear short-circuited. If the battery releases a lot of heat in a limited space due to short circuit, the result is no different from a firecracker, just imagine you driving a giant firecracker around, what is it like?
Therefore, people of insight have long formulated relevant norms. According to GB 38031-2020 "Safety Requirements for Power Batteries for Electric Vehicles": The battery pack or system should provide a thermal event alarm signal (serving the vehicle thermal event alarm to remind the occupants to evacuate) 5min before the thermal diffusion of a single battery causes thermal diffusion and thus causes danger in the occupant compartment.
The acupuncture experiment is to use a steel needle to pierce the battery pack that is close to the full power state, causing the battery cell to be punctured, the battery short circuit, and triggering the cell to lose thermal control. Simulate the risk scenarios of thermal runaway, fire, explosion and other risk scenarios of battery packs that may occur after a tram collision to assess the thermal runaway safety of batteries. The needle punch material is steel, the needle punch diameter is 3 mm ~ 8 mm, the needle puncture speed is 0.1 mm / S ~ 10 mm / S, and the position and direction that can trigger the thermal runaway of the battery cell are selected.
BYDinender Era Controversy Ean and Ott can follow suit
Acupuncture test is considered to be the most stringent test method for battery safety, and is used by car companies as a way to publicize battery safety. What really makes the "acupuncture experiment" into the public eye is BYD. At the "blade battery" press conference on March 29, 2020, BYD compared the complete needle prick experiments on ternary lithium batteries, ordinary lithium iron phosphate batteries and "blade batteries", which caused public concerns about the safety of ternary lithium batteries. Through this needle prick test, BYD made the name of blade battery. Whether the battery can pass the needle prick test and how to pass the needle puncture test has suddenly become one of the criteria for judging the safety of the power battery.
Although the new national standard cancels the acupuncture test for battery cells, in Appendix C, two test methods are recommended for thermal diffusion tests: acupuncture or external heating. And in the minds of many consumers, acupuncture experiments still occupy the main position in the evaluation of battery safety.
Although the test conditions are more stringent, many car companies are still keen on this. For example, at the end of last year, GAC Aeon did a reduced version of the acupuncture experiment when releasing the magazine battery technology, and recently, saic-GM Aoteneng batteries also had a similar shot. However, compared with the GAC Aian magazine battery experiment, the SAIC-GM Aoteneng battery is more generous in terms of experiments, and although its needle prick experiment has not been penetrated, it has a standard.
It's not that Mitsubishi Atuka doesn't dare to do it, it's really can't do it
From the perspective of the experiment itself, MYAUTO found that the test standard of the SAIC-GM Aoteneng battery is much higher than the national standard requirements, such as the national standard requires that the battery pack temperature >0 °C, the battery power > 95%, and the temperature of the Aoteneng battery test is increased to 48.9 °C, and the battery power is 97%, close to the full power state.
Similar to GAC Aean, the SAIC-GM Aoteneng battery needle puncture test is also a steel needle inserted from the side and does not penetrate the battery body. But the difference is that this time there is a depth of acupuncture: 9 mm. That is to say, although it is not punctured, the battery is punctured to a certain depth, and compared with gagac Aean's magazine battery, with the depth value as a reference, it is much stronger than the depth without reference.
From the results, the high-temperature gas is quickly discharged from the opening, which also proves that the huge chemical energy inside the battery pack itself has certain hidden dangers. GAC Aean understands things that BYD understands, of course, SAIC-GM Aoteneng and GAC Mitsubishi also understand. So the same purpose, there is a different performance difficulty. GAC Aean tasted a little, SAIC-GM Aoteneng battery slightly increased, Mitsubishi Artuka directly gave up, you say there is no cat grease in this?
Why Mitsubishi Artuco gave up the acupuncture experiment, MYAUTO believes that on the one hand, it may be related to the poor performance of GAC Aean magazine batteries, on the other hand, the same experiments cannot reflect the due value of GAC-Mitsubishi as a joint venture brand. As a joint venture brand, people of course think that foreign monks should be better than domestic ones in terms of quality and safety, but you ask the shell version of Mitsubishi Atuka to do better than GAC Aehan V. This is not a concubine who does not want to do it, but it is really impossible to do it!
From a realistic point of view, Mitsubishi Motors has long lost the minimum technical and quality advantages of the joint venture brand, so that it has fallen to the point of relying on OEM to change shell cars, such a model to prove self-safety, learning SAIC-GM Aoteneng is absolutely impossible. So do a test so-so, tiger head snake tail, such self-certification safety, is really a tiger!
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