On June 27, Geely officially released the latest generation of "blade-type" lithium iron phosphate batteries - Aegis short knife batteries. Aegis short knife battery is Geely's self-developed and self-produced power battery, which has unique properties such as ultra-safety, ultra-durability and ultra-fast charging. Especially in terms of safety, not only the battery cell successfully passed the 8-needle puncture test of the China Automotive Center, but also the same battery pack easily passed the 6 "devil" serial tests of the China Automotive Center, leading the highest standard of power battery safety with the "Aegis Standard".
The short knife has become the mainstream form of the current new energy vehicle power battery, and the short knife is the new generation. Aegis short knife battery has the advantages of shorter length, higher energy density, higher volume utilization, more flexible structural design and group arrangement, etc., and will become the safety and efficiency benchmark of the latest generation of "blade" lithium iron phosphate batteries.
"Military-grade" safety, the Aegis short knife battery cell can withstand 8 needles and real bullet shooting
Aegis short knife battery adopts a high heat-resistant separator with high strength and high thermal stability, a high-safety electrolyte with more stable film formation, higher compactness and higher safety, and self-developed "self-fusing technology" through the appropriate electrode surface density and compaction density design. Once the battery cell is punctured, the aluminum foil will melt and form a diaphragm to collapse, forming an insulating layer to block the short circuit, greatly improving the safety level of the battery cell.
In the industry, a single acupuncture test has been regarded as the most difficult power battery safety performance test, "8 needle puncture" on the battery cell destructive force will be significantly increased, will cause multiple damage points to the battery cell in a short period of time, increase the risk of short circuit inside the battery, but also may cause more complex thermal and mechanical effects, the test of cell safety is more than 8 times more difficult. In the "8-needle puncture" test of China Automotive Research Institute, the battery cell of the Aegis short knife battery was punctured by 8 steel needles with a diameter of 5mm at the same time and stood for 1 hour, but still did not smoke, fire or explode.
In addition, the Aegis Short Knife battery cell has achieved the world's first 5.8mm real bullet gun penetration test, and the 5.8mm automatic rifle bullet penetrates the battery cell at a speed of 920m/s, causing explosive damage to the wound diameter of ≥60mm, and the battery cell does not catch fire and does not explode.
Exceeding the national standard/first standard The battery pack has passed the serial test of 6 "devils".
In addition to the "8 needles and puncture" test of the battery cell, Geely also launched the industry's first "devil" serial test on the Aegis short knife battery pack, including dynamic seawater corrosion immersion, plateau extreme cold, high-frequency bottom scraping, 26-ton overweight reciprocating rolling, single-pack side pillar collision, flame scorching and other six "devil" serial tests. Relying on the patented design of the "Tianzi grid" frame of Aegis battery, the energy-absorbing cavity, the three-layer sandwich bottom guard, the integration of CTB battery body, the risk control of accidental thermal runaway, and the multiple protection of battery cell safety, the Aegis short knife battery pack successfully and easily passed all 6 tests.
In the serial test, the Aegis short knife battery pack was tested with several times or even dozens of times the test conditions required by the national standard, as well as the test standard pioneered by Geely in the industry. The test results show that the Aegis short knife battery pack does not catch fire, smoke or explode under the challenge of dynamic seawater corrosion immersion and plateau extreme cold, and the insulation resistance value and air tightness of the positive and negative electrodes are normal after standing. In the challenges of high-frequency bottom scraping, 26-ton overweight reciprocating rolling, and single-pack side pillar collision, the battery pack did not have thermal runaway phenomena such as fire, explosion, and smoke, and no electrolyte leakage, and the insulation resistance of the positive and negative electrodes was normal after standing, and there was no intrusion and deformation of the battery cell; In the Flame Burning Challenge, after 70 seconds of direct flame burning and 60 seconds of oil pan scorching, the battery pack did not have thermal runaway such as fire, explosion, and smoke. It shows that the Aegis short knife battery pack has a high degree of safety and reliability even if it is continuously damaged under various extreme conditions.
3,500 laps of ultra-long cycle life, safe driving mileage can exceed 1 million kilometers
Due to the use of multi-element doped cathode materials and small particle anode materials, combined with its small size and small internal resistance, the internal chemical reaction speed is effectively slowed down and the battery life is significantly prolonged.
According to calculations, the cycle life of the Aegis short knife battery can reach 3,500 laps, which is equivalent to a safe driving range of up to 1 million kilometers, which is equivalent to 25 laps around the earth. According to the estimation that ordinary family cars drive 20,000 kilometers in one year, the Aegis short knife battery can be "serviced" for up to 50 years, significantly delaying the retirement time of battery cells, increasing the residual value of pure electric used cars, and reducing carbon emissions by more than 80,000 tons per year, equivalent to planting 4.7 million trees.
The fast charging capacity is super strong, and the low-temperature discharge performance is more stable
At the same time, carbon nanotubes with finer diameter and longer length are used to create a "highway" for ion transmission, and additives with lower film-forming impedance are added to the electrolyte to make it easier for lithium ions to enter the negative electrode, thereby greatly improving the fast charging performance.
The test data shows that under the same battery capacity, the 10~80% SOC charging time of the long knife battery takes 26 minutes, and the average charging rate is 1.61C, while the Aegis short knife battery only takes 17 minutes and 4 seconds, and the average charging rate can reach 2.45C, and the heat generation is lower, which makes people more assured.
In addition, in extremely cold environments, the Aegis short knife battery also has a stronger discharge capacity and longer cruising range than the long knife battery. Even when the ambient temperature is at -30°C, the capacity retention rate of the long knife battery "plummets" to 78.96%, and the capacity retention rate of the Aegis short knife battery can still reach 90.54%, so that users in low temperature environments no longer have the worry of "breaking the power in winter".