Text: Understand the original Cao Hao of The Emperor of Che
For electric vehicle users, battery life anxiety, charging anxiety, and battery safety anxiety cannot be avoided. However, with the continuous development of related technologies, battery life anxiety has been temporarily alleviated to a certain extent, and charging anxiety is also in the process of linking with the continuous development of power exchange and fast charging technology. What about battery safety?
In fact, at present, every company is also targeted in solving the battery safety problem, and this time we will understand the efforts made by Lantu Automobile in battery safety.
Lantu FREE Extended Range Edition & Pure Electric Edition
<h1 class="pgc-h-arrow-right" data-track="4" > two sets of power with two battery technologies</h1>
Landu FREE should be one of the few models in the current market that launch pure electric and extended range hybrid two powertrain models based on the same platform, although these two powertrains are equipped with the same battery cell, but considering that the actual use scenarios of the two power batteries are slightly different, so Lantu engineers have also used two different battery technologies for pure electric and extender hybrid models.
Lantu amber battery
Lantu FREE pure electrical version of the battery technology is named - amber, as the name suggests is to fill the battery pack with special silicone composite materials, this material is characterized by the combination of silicone polymer + low-density thermal insulation material + flame retardant, the formation of an efficient thermal insulation flame retardant insulation layer, so that each single cell like amber in the full wrapping.
The extended range version of the battery technology is named "mica", in fact, it is to make the cells and modules stacked together like mica stone, and add layered AI-Si mica and aerogel filling in the battery pack, thereby improving the high temperature resistance and insulation of the battery pack, and the mica sheet at the top of the module can withstand high temperatures greater than 1000 degrees Celsius.
In addition, Lantu FREE's battery pack also has "three-dimensional thermal insulation wall" technology, passive security of five layers of security protection, and Lantu's exclusive cloud BMS active security solution, so that the battery pack can always be in a safe working state.
In fact, no matter which battery technology, in the battery system thermal diffusion experiment carried out in accordance with the new national standard, even if the battery cell is thermally out of control, it can still ensure that there is no fire for 5 minutes, and even 30 minutes, and even stand for 50 days without fire and do not explode.
The technical route adopted by Lantu is to carry out safety protection on the basis of the single cell, while the technical route of BYD and GAC Aeon is equipped with corresponding safety technology on the basis of the battery module. However, no matter which technical route, it is to improve the safety performance of the power battery and ensure that the battery avoids the occurrence of thermal runaway phenomenon as much as possible in extreme conditions.
<h1 class="pgc-h-arrow-right" data-track="21" > three actual measurements to verify battery safety</h1>
On the day of the event, in addition to releasing battery technology, Lantu also carried out three safety tests on the battery pack, such as extrusion, simulated collision and high temperature water.
The extrusion test is to simulate the intrusion scenario of the whole vehicle after being hit. By using a rigid semi-cylinder with a radius of 75 mm, squeeze the battery pack with a force of 200 kN, hold for 10 min, and observe for 1 h. The cylinder intrusion position is probably between the A and B columns of the vehicle, this position is mainly the position of the front passenger, and Lantu in order to highlight the safety, not only abandons the body structure, so that the cylinder directly invades the battery pack, but also increases the extrusion force from the 100 kN required by the national standard to 200 kN.
Only the shell produces some degree of depression
In the end, after the battery pack was squeezed for 10 minutes, only a certain degree of depression was generated in the shell part, but the steel column did not invade the inside of the battery pack, that is, the battery cell was not affected in any way, so after observing for 1 hour, the battery pack did not catch fire and explode.
The second simulated crash test is mainly to simulate the acceleration scenario generated after the collision of the whole vehicle. The experimental equipment uses an accelerated trolley from Mitsubishi Heavy Industries. After a short period of energy storage, the acceleration trolley hit the battery pack at an acceleration of 50g/60 milliseconds, and the instantaneous battery pack did not leak, rupture, fire, explosion, etc., and there was no abnormality after 2 hours of observation, and the insulation resistance was also higher than 100 ohms/ volt. More critically, the acceleration of 50g/60 milliseconds used in this test is also much higher than the 28g/60 milliseconds specified by the national standard.
The third test is used to verify whether the high-voltage interface position of the power battery can maintain a safe seal under the continuous impact of high-pressure water flow. During the test, a high-pressure spray gun was set at 4 angles, the injection pressure was 10 MPa, and the water temperature was 75-85 degrees Celsius. It should be known that the spray pressure of the high-pressure water gun in the conventional car wash is only about 5 megapascals, and the spray pressure of 10 megapascals is generally less common.
After 3 minutes of continuous spraying of the high-pressure water gun, the battery system did not enter the water, nor did it short circuit, fire, explosion and other situations occurred, which shows that the waterproof performance of the battery pack of Lantu FREE is very good, and it is definitely not a problem to cope with the general rain environment.
<h1 class="pgc-h-arrow-right" data-track="25" > long battery life, ultra-fast charging technology on the agenda</h1>
At the press conference, Lantu also released the relevant plans for future batteries, especially they have begun to test the next generation of high-nickel soft pack batteries with suppliers, and it is expected to achieve the goal of completely no thermal runaway. In addition, Lando also plans to launch high-energy density batteries with an energy density of 330 Wh/kg.
In addition, in terms of charging technology, Lantu's super fast charging technology has been developed, which can charge 60% in 20 minutes, and increase the cruising range of 400 kilometers by charging for 10 minutes. In addition, Lando will also launch products equipped with 800-volt electrical and electronic architecture and SiC silicon carbide technology in the future.