As a new energy car user, I am most concerned about the range, and the range of three to five hundred kilometers does not make much of a difference in actual use. I can't find a charging post when I need to recharge my batteries, and I'm not worried about the battery degradation when I run out of power.
Three years ago, I chose to buy a new energy car, not because it was "smart". "Hello, xx" to help me open the windows and play whoever's song, are some irrelevant functions. Even if you just give me the highest level of autopilot, that's not what I'm looking for.
Safety! It is vital, more important than any bragging rights of the intelligent configuration of the dragon and phoenix. After all, new energy vehicles in recent years, spontaneous combustion accidents, and is on the rise. There has been a saying that the higher the energy density of the power battery, the longer the range, but the lower the stability, the worse the safety.
In this regard, BAE released the world's first magazine battery system safety technology, the industry's first ternary lithium battery pack pinprick does not catch fire. Recently (May 20), GAC EA once again released the lithium iron phosphate (magazine battery) pin prick test, refreshing the lithium iron phosphate battery safety new height.
Triple lithium batteries have inherent defects?
Domestic car companies have been blindly pursuing high range, 500km +, or even 600km +. In order to achieve greater range, major manufacturers have adopted higher energy density batteries.
For current lithium-ion batteries, high energy density means more active lithium ions per unit volume. The lithium ion is a very "naughty" thing, that is, love to burn, not moving, spontaneous combustion.
At the 2019 World New Energy Vehicle Congress, Hideyuki Sakamoto, president of the Society of Automotive Engineers of Japan, said in a speech that the increase in energy density is not particularly difficult, but it is not easy to ensure safety.
Lithium iron phosphate batteries are a good choice, the safety performance is relatively high, even Tesla launched a lithium iron phosphate battery version after domestic production, and plans to gradually replace the ternary lithium battery.
The solution to Li-ion battery safety
In the same range, the weight of the whole package of Li-ion battery is 100-150kg lighter than that of Li-FePO4, and the light weight of the whole vehicle can make the vehicle's maneuvering and accelerating performance get significantly improved. In addition, ternary lithium batteries in the low temperature environment than lithium iron phosphate battery range is about 10% higher. Lithium iron phosphate, on the other hand, has an ultra-high cycle life of 4000+ cycles, which is twice as long as other Li-ion ternary batteries, and at the same time costs less, making it suitable for customers with high-frequency charging needs.
Although Li-ion ternary batteries have better overall performance, Li-FePO4 batteries are more thermally stable and have better safety performance. The emergence of the GAC EA magazine battery solves the problem of choosing between Li-ion ternary batteries and Li-FePO4 batteries. Magazine battery is not just a simple battery, but a complete safety technology system. The magazine battery is fully optimized for four aspects: battery core material, battery structure, cooling system and battery management.
Lithium iron phosphate safety is again improved
It is understood that the magazine battery is the industry's only two major technology routes at the same time to take into account the safety of lithium ternary and lithium iron phosphate battery technology. Experiments have shown that magazines can make different chemical system batteries (lithium ternary and lithium iron phosphate) are safe from fire.
The test, the use of lithium iron phosphate ordinary batteries and magazines battery comparison test. The test conditions also chose the most stringent test conditions of the national standard, that is, under the conditions of 8mm diameter of the thickest steel needle and 100% SOC power, to carry out the needle puncture test.
The test results show that the whole pack of LiFePO4 (ordinary battery) experienced a voltage drop and temperature rise after the steel needle pierced the core and triggered thermal runaway, with a maximum temperature of 329.4 and smoke appearing for 16 minutes.
Lithium iron phosphate (magazine battery) after the whole pack was stabbed, the highest temperature is only 51.1, after 48 hours of rest, the monomer voltage drops to 0V, the temperature drops to room temperature, and no smoke, no fire and explosion phenomenon, the battery pack state is stable.
In the end
Research and development capabilities, or traditional car companies are great, after all, the technical reserves are here. The new forces can only start from those irrelevant so-called "smart", the breakthrough of the core technology of the product but can not help.
In terms of brand value, should give customers the ability to bring a premium, it should be a contribution to the industry has done or to lead and drive the role, such as BAE magazine battery, its safety to the industry to bring a way out.