Recently, the China Automotive Technology Research Center (CARIC) conducted a continuous test on Xiaomi SU7 Ultra in extreme scenarios: bottom scraping in 350mm deep pit, flying slope + steel diamond barrier scraping bottom, 450mm wading after bottom scraping, vehicle simulation 70km/h collision, extreme test fast charging and quick release five times, after extreme scenario test, the battery system function is still intact.
This test not only verified the safety of Xiaomi SU7 Ultra, but also pushed the behind “hard core battery technology provider” Ningde era Kirin battery to the front of the stage.
, the reason why this test has attracted the attention of the industry lies in the authority of its testing institutions and the rigor of the test conditions.
China Automobile Research Institute is a central enterprise directly under the State-owned assets Supervision and Administration Commission of the State Council.
it is the national technical focal point unit and industrial policy support organization of China’s automobile industry.
at the same time, it is also the only comprehensive scientific research institution with complete technical service capability of the whole automobile industry chain in China.
The testing ability of China Automotive Research Institute covers the whole life cycle of the automobile, and the standard is far more stringent than the national standard.
Its test has global mutual recognition qualification and has won laboratory approval (CNAS) from the European Union, Japan, ASEAN and other regions.
The test report can be directly accepted in more than 50 countries.
, the way of Kirin: high performance does not compromise safety, Xiaomi SU7 Ultra’s violent performance on the track has been obvious to all, its 1548PS horsepower and 1330kW discharge power can not be fully released without the performance of Kirin battery and thermal management cool techs.
The result of “normal battery function after five extreme challenges” in Sinochem test is essentially a systematic verification of Kirin battery technology in Ningde era, which confirms Kirin battery’s adherence to the bottom line of “high performance and uncompromising safety”.
This “performance radical, safety conservative” strategy reveals the true luxury logic of electric cars: only when it is safe to talk about performance ceilings.
The reason why Kirin battery can withstand the “hell-level test” can be summarized into several core innovations: Xiaomi SU7 Ultra’s Kirin II battery uses a “bulletproof coating” at the bottom.
This kind of coating, which is similar to tank armor protection, can effectively resist the damage caused by the impact of foreign bodies and rubbing on the electric core in accidents such as bottom support.
Compared with the traditional PVC coating, the bulletproof coating has achieved a significant improvement in a number of key properties, such as tear resistance by 10 times, puncture resistance by 13 times, scratch resistance by 10 times, and adhesion (corrosion resistance) by 10 times.
This coating is like putting a super protective suit on the bottom of the battery, greatly enhancing the battery’s viability in harsh conditions.
, 
, structural protection innovation.
Kirin battery has an ingenious space sharing scheme at the bottom of the battery package, leaving plenty of impact deformation space.
This means that when the bottom of the battery pack is hit hard, even if there is extrusion deformation, the interior can still maintain structural integrity, just like putting on a strong and flexible armor for the battery.
Kirin batteries have the highest level of waterproofing.
The IPX grade is used to evaluate the waterproofing level of electrical equipment.
The higher the number, the better the protection.
Static waterproof IPX8 and dynamic waterproof IPX9K are the highest.
The Kirin battery has the highest level of waterproofing, so it can easily pass 450mm wading in the automobile research test.
, 
, in addition, the invisible inputs such as the second generation non-thermal diffusion technology (NP2.
0) and PPB manufacturing process of Kirin battery further build a solid line of defense.
The original NP2.
0 technology of Ningde era can achieve thermoelectric separation.
When a cell is heated due to a fault, NP2.
0 is designed through thermoelectric separation to physically isolate the pressure relief port (smoke exhaust direction) of the cell from the high voltage circuit.
For example, the explosion-proof valve of the cell is set at the bottom, while the high-voltage circuit is set at the top to achieve thermoelectric separation and avoid short circuit caused by the direct impact of high-temperature conductive flue gas on the circuit.
An independent pressure relief channel and a mica shield are also designed at the bottom of the cell, and the high temperature smoke is discharged through the exclusive channel at the bottom to avoid secondary injury.
As a high-tech product, the manufacturing quality of power battery is directly related to safety.
Kirin battery adopts PPB manufacturing process, the cell defect rate is controlled at 1/1000000000 (traditional 1/1000000), and the risk of internal short circuit caused by burr and impurities is eliminated from the root.
The above invisible “safety redundancy” gap is the core reason why some model parameters are similar, but the safety performance is very different.
Safety standard reconstruction: the technical benchmark guides the industry safety standard to leap.
This test of China Automotive Research has two unique values.
One is for the test of customization of track-level battery packs.
All the test items come from users’ real car scenarios and test their safety under extreme conditions one by one.
Second, the test standard far exceeds the “national standard”: extreme bottom scraping, simulated 350mm deep pit sawtooth continuous scraping, which is 2.
3 times of the national standard test depth (150mm).
collision strength doubles, the collision speed of the whole vehicle of 70km/h is 46% faster than that of the national standard (48km/h), and the acceleration impact reaches 60g (only 28g of the national standard).
the wading limit is pulled up, and the wading depth after scraping is 450mm, which breaks through the limit value of the national standard 300mm Violent charge and discharge after extreme test, 1330 kW maximum discharge power, 20% electricity discharge power up to 800kw, maximum charging power up to 480 kW, still online.
Ningde era has set up a safety technology benchmark through the “super test” of Kirin battery, which will force the industry from “reaching the standard” to “limit verification”.
In the future, as more car companies join the camp of “super-national standard testing”, electric vehicle safety standards may usher in a new round of jump.
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