• 21.07.2024

    TOP AUTO NEWS

    Auto news from China

    Geely Shield Short Sword Battery: Safety, Fast Charging, and High Energy Density

    Jun 28, 2024

    Geely Shield Short Sword Battery: Safety, Fast Charging, and High Energy Density

    On June 27, Geely Auto officially released its self-developed and self-produced latest generation “blade-type” lithium iron phosphate battery – the Shield Short Sword Battery. Compared to the current industry’s “long sword battery,” the Shield Short Sword Battery has significant advantages in safety performance, cycle life, fast charging capability, and low temperature discharge.

    Geely Shield Short Sword Battery: Safety, Fast Charging, and High Energy Density

    At the same time, the Godshield short sword battery is shorter in length, with higher energy density and higher volume utilization. It is more flexible in grouping and compatible with a wide range of vehicle types such as sedans, commercial vehicles, SUVs, and MPVs. The “Global Intelligent Pure Electric SUV” Geely Galaxy E5 will be the first to be equipped with the Godshield short sword battery. Key points: 1. Length of 580mm, about 40% shorter than the long sword battery, with lower internal resistance, less heat generation, and less energy loss. 2. Energy density increased to 192Wh/kg, with a 50% increase in volume utilization. 3. The first in the world to withstand 8 steel needles with a diameter of 5mm piercing simultaneously for 1 hour without smoke, fire, or explosion. 4. The first in the world to withstand “live ammunition penetration” challenge without catching fire or exploding. 5. More suitable for CTB battery body integration. 6. 3500 cycle life, 1 million kilometers driving life. 7. Stronger low temperature endurance, averaging 8.7% better than the long sword, optimizing the winter decay issue of lithium iron phosphate. 8. From 10% to 80% battery capacity in just 17 minutes, reaching up to 2.45C. 9. Excellent low temperature resistance, with battery capacity still above 90% in -30°C temperature environment.

    Geely Shield Short Sword Battery: Safety, Fast Charging, and High Energy Density

    The length of the Geely Shield Short Sword battery is 580mm, about 40% shorter than the long sword battery. Its advantages include shorter length, lower internal resistance, and less heat generation in the battery core, effectively reducing safety risks. It also uses a wet double-coated diaphragm internally, with better flexibility, less likely to break when punctured, and smaller damage hole size, reducing the risk of short circuits. Additionally, it uses heat-resistant coatings like alumina, adding a “isolation band” between the positive and negative poles, making the battery less likely to shrink during severe punctures, avoiding thermal runaway, and improving diaphragm heat shrinkage performance. It uses a high-temperature resistant diaphragm, a stronger heat-resistant base material, and a high-temperature resistant coating, enhancing the heat resistance of the insulation layer. The flexibility of the diaphragm base layer and the rigidity of the ceramic in the coating, with a “soft + hard” dual effect, to some extent offset external mechanical abuse. The diaphragm adhesive layer effectively combines the diaphragm with the positive and negative electrodes, playing an important role in stabilizing the internal structure and interface uniformity of the battery core. In addition, the Geely Shield Short Sword battery increases the inorganic content of the SEI film to improve its stability. Adding high-content LiFSI, FEC, etc. to the electrolyte can produce more LiF chemical components in the SEI film. Finally, the self-fusing technology organizes thermal runaway, controls the needle puncture melting current, causing the aluminum foil to melt after the battery core is punctured, causing the diaphragm to collapse, forming an insulation layer, blocking short circuits, and greatly improving the safety level of the battery.

    Geely Shield Short Sword Battery: Safety, Fast Charging, and High Energy Density

    The core of the God Shield short knife battery meets 8 times the national standard, allowing 8 steel needles with a diameter of 5mm to puncture simultaneously and maintain for 1 hour without smoking, catching fire, or exploding. It is also the world’s first battery to pass the 5.8mm live bullet penetration test, still not catching fire or exploding under extreme destructive conditions.

    Geely Shield Short Sword Battery: Safety, Fast Charging, and High Energy Density

    The Shield Battery Pack is upgraded with the industry-leading CTB configuration. It utilizes the “grid” framework patent design to double the overall modal. With energy-absorbing cavities, the battery pack provides all-round protection for the cells by incorporating liquid-electric separation, electrical isolation, heat dissipation, and thermal conduction designs to enhance safety. The Shield Short Sword Battery features a three-layer composite + DP980 steel “sandwich” structure bottom plate with a total adhesive layer thickness of 2.6mm to effectively protect against bottom damage. It also includes a dedicated battery anti-collision beam at the front, positioned 15mm below the battery to greatly reduce damage in forward scraping scenarios, making the Shield Battery Pack fearless on risky roads. In case of thermal runaway risks, the Shield Short Sword Battery uses two explosion-proof valves for rapid pressure relief to balance internal and external pressures, allowing heat to dissipate quickly and significantly reducing the risk of battery explosions. The Geely Xingrui Intelligent Computing Center is the world’s first “cloud, data, intelligence” integrated super cloud computing platform for car companies, and the largest and most powerful intelligent computing platform in China. With industry-leading computing power of 102 billion trillion operations per second, it provides a strong computing base for Geely’s intelligent security. The Xingrui Intelligent Computing Center can support 5 million vehicles online simultaneously, monitoring batteries, electric drives, and charging and distribution 24/7. It enables cloud-based fault warnings, online fault diagnosis, and online vehicle maintenance. By identifying potential safety risks in advance and utilizing intelligent after-sales services, it further reduces the risk of vehicle use for users.

    Geely Shield Short Sword Battery: Safety, Fast Charging, and High Energy Density

    The God Shield short sword battery pack has also undergone 6 “devil” serial tests conducted by the China Automotive Center, including sea water surfing, high-altitude extreme cold, high-frequency scraping, extreme rolling, battery pack side column impact, and flame baking. The significance of the 6 “devil” serial tests is to comprehensively evaluate the performance of the battery pack under continuous damage in various extreme conditions, ensuring its high safety and reliability in practical applications.

    Geely Shield Short Sword Battery: Safety, Fast Charging, and High Energy Density

    The TSN-style rewrite is as follows: The small size, low internal resistance, and low heat generation of the God Shield short sword battery effectively slow down internal chemical reactions, extend battery life, and have a cycle life of 3500 laps, allowing for safe travel of over 1 million kilometers. After 1500 cycles, the capacity retention rate can reach 92.12%; after 2500 cycles, the capacity retention rate can reach 87.73%, effectively slowing down battery degradation and solving the problem of low residual value of used pure electric vehicles.

    Geely Shield Short Sword Battery: Safety, Fast Charging, and High Energy Density

    The physical characteristics of the Shield Short Sword battery determine its lower internal resistance, while optimizing and upgrading the material system to greatly improve fast charging performance. By using carbon nanotubes with smaller diameter and longer length, the negative electrode connection is tighter, creating a “highway” for ion transport. Adding additives with lower film impedance to the electrolyte reduces the diffusion impedance of lithium ions, making it easier for lithium ions to enter the negative electrode. The charging time from 10% to 80% SOC is only 17 minutes and 4 seconds, with an average charging rate of up to 2.45C.

    Geely Shield Short Sword Battery: Safety, Fast Charging, and High Energy Density

    The TSN-style rewrite: The Shield Short Sword battery also has excellent low-temperature resistance, with a capacity of over 90% at -30°C, making up for the weakness of lithium iron phosphate batteries in low-temperature performance compared to ternary lithium batteries.

    Geely Shield Short Sword Battery: Safety, Fast Charging, and High Energy Density

    Geely Shield Short Sword Battery: Safety, Fast Charging, and High Energy Density

    The TSN-style rewrite: The first battery core of the God Shield Dagger was successfully produced at the Yancheng Yaoning Factory on November 25, 2023. The Yangshan Poly Plant, as the production base for the Geely God Shield Dagger battery pack, has been fully operational since April 2024.