LR936 battery.Are ternary lithium batteries unreliable? BYD’s technology is good, Geely’s can keep the fire burning for 70 seconds

　　What are electric cars most afraid of? It won’t work if it’s too cold, too hot, too wet, or too charged. At worst, the battery will age faster and the battery life will shrink; at worst, it will spontaneously ignite or even explode on the spot.

　　What are electric cars most afraid of? It won’t work if it’s too cold, too hot, too wet, or too charged. At worst, the battery will age faster and the battery life will shrink; at worst, it will spontaneously ignite or even explode on the spot. In March, Tesla spontaneous combustion occurred 4 times; on April 21, a Tesla Model S suddenly spontaneously ignited and exploded in an underground garage in Shanghai; and in May, on May 3, a private garage in San Francisco On May 12, a Tesla Model S parked in a parking lot in Hong Kong spontaneously ignited and exploded. It took firefighters 45 minutes to put out the fire. At the same time, Weilai suffered spontaneous combustion on April 22 and May 16, causing panic in the industry. Indeed, compared to insufficient battery life and reduced battery life, battery safety is the most important thing.

　　Is it really useful to add protection mechanisms and limit charging capacity? In response to industry doubts, both companies have provided corresponding solutions. Among them, Tesla announced that it will launch wireless software updates for Model S and Model X to adjust battery charging and thermal management. System settings to further protect the battery and extend battery life. NIO's approach is to issue "Temporary Measures to Enhance Charging Safety", which temporarily limits the charging capacity to 90%. The official explanation is: In view of the fact that the failure probability of power batteries will increase when they are in a state of high power for a long time, Before the formal investigation results come out, temporary measures will be taken to limit the charging capacity to 90% for exclusive piles and vehicles that are connected to the Internet. It's just that these two methods are not the most complete solutions in both literal terms and actual effects. They are even suspected of avoiding the most important and taking the easy. After all, no matter how the software is optimized, it cannot solve the shortcomings of the hardware.

　　For example, NIO's restriction on charging will only further affect the vehicle's endurance and battery life; Tesla's adjustment of the battery charging and thermal management system settings is only a temporary solution, not the root cause, and may also have a certain impact on the vehicle's endurance. impact, so enhancing the reliability of the battery is the first priority.

　　Battery safety is very important, how to play with it? Faced with the new battery safety requirements, major powerhouses are also trying their best to find breakthroughs. Currently, nickel-cobalt-manganese ternary batteries are used in China, and under the domestic requirements for high battery life, High-density, low-cost products such as 811 high-nickel batteries will become mainstream (the ratio of nickel: cobalt: manganese is 8:1:1). Both CATL and BYD will launch corresponding products this year.

　　However, as the nickel content increases, the thermal stability of the battery cathode material becomes worse. High-nickel batteries may pose safety risks when encountering high temperatures, external impacts, etc. BYD's method: First, battery outsourcing. BYD applies metal hard-shell battery packs with a simpler and firmer structure, better airtightness and thermal runaway suppression capabilities, and adopts a battery thermal management system (BMS) to effectively control battery temperature and delay battery degradation. attenuation and improve the charging and discharging performance of the vehicle. Geely's method: Geely Automobile uses batteries from CATL and also uses a world-class quality management system. There are more than 2,600 quality and safety control factors at the battery level alone.

　　Thanks to this, the battery pack has a dustproof and waterproof level of IP67, and has excellent waterproof and fire resistance (can be immersed in 1 meter of water for more than 1 hour, and can be directly exposed to flames for 70 seconds). This battery system is currently installed on Geometry A. SAIC’s approach: SAIC New Energy’s batteries also meet the IP67 standard. In addition, SAIC also promised that “battery degradation will not exceed 20% in 5 years or 100,000 kilometers, and battery degradation will not exceed 30% in 8 years or 120,000 kilometers.” , protect the interests of consumers.

　　All in all, the battery is the safety lifeblood of pure electric vehicles, and there is currently a high demand for high-endurance models in China. Therefore, high-nickel ternary lithium batteries will be the mainstream. Therefore, how to do a good job in safety protection is a major topic. Instead of relying on Instead of upgrading the system and limiting the charging capacity to maintain stability, it is better to introduce advanced and reliable processes in the R&D and manufacturing stages to ensure battery quality. I believe that with the development of technology, future batteries will be more stable and reliable.

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