Great Wall Motors Dayu Battery will be fully applied in 2022 without fire or explosion

Recently, the China Association of Automobile Manufacturers announced the overall sales data of the Chinese automobile market in the first half of the year. From January to June, the sales of new energy vehicles reached 1.206 million units, a year-on-year increase of 201.5%, and the sales growth rate was rapid. This is largely due to the rapid development of battery technology in recent years to meet the pain points of consumers' range. However, to gain more recognition from consumers, it is necessary to further meet the pain points of winter range and battery safety.

There are currently two mainstream battery routes, lithium iron phosphate batteries and ternary lithium batteries. Lithium iron phosphate batteries are relatively safer at high temperatures, but their low-temperature endurance is significantly reduced, and their energy density is relatively low. The current system energy density is only 140~160Wh/kg at most. The low-temperature discharge performance and energy density of ternary lithium batteries are significantly higher than those of lithium iron phosphate batteries. The energy density of the NCM811 ternary lithium battery system can exceed 190Wh/kg at most. As the nickel content increases, the stability of the positive electrode material also decreases, resulting in an increased risk of battery spontaneous combustion caused by thermal runaway. Therefore, solving the thermal runaway problem of high-nickel ternary lithium batteries has become one of the best battery solutions at the moment.

How to solve the thermal runaway safety problem of high-nickel ternary lithium batteries has become a key topic in the technical research and development of the new energy vehicle industry. On June 29, Great Wall Motors released the Dayu battery, which is designed with the idea of ​​"Dayu controlling floods, changing blocking to dredging", and can effectively solve the fire and explosion problems of different chemical system batteries after thermal runaway, breaking the technical bottleneck of high safety and high energy density.

New design concept: Dayu batteries will not catch fire or explode

On the technical level, Dayu Battery has achieved the integration of multiple technologies through eight new design concepts, including heat source isolation, two-way commutation, heat flow distribution, directional explosion disposal, high-temperature insulation, automatic fire extinguishing, positive pressure oxygen barrier, and intelligent cooling, as well as dozens of core technology patents, ensuring the core advantages of "large-capacity high-nickel battery cells", "any position in the battery pack", and "single or multiple battery cells" without fire or explosion when thermal runaway is triggered.

Dayu Battery has 8 new design concepts and dozens of core technology patents

Among them, directional explosion disposal, as one of Dayu Battery's core technologies, can be combined with the position of the explosion-proof valve of the battery cell to design the gas and fire flow path after thermal runaway, and quickly guide the fire source to the fire extinguishing channel and discharge it safely through diversion, diversion, and two-way commutation. At the same time, high-temperature insulation protection is provided for high-voltage connections and high-voltage safety areas to eliminate the risk of high-voltage arcing.

While fully optimizing the design concept, Dayu Battery also adopted the world's most stringent safety testing method to achieve a comprehensive test of safety performance. Dayu Battery uses the industry-recognized most challenging ternary 811 system high-nickel large-capacity battery cells, because the intensity of thermal runaway triggered by acupuncture and heating of the battery cells is similar, but the large amount of heat generated by heating is more severe than acupuncture. The trigger position is the middle battery cell of the module, and the world's most stringent test method of continuously triggering two batteries is adopted.

Comprehensive safety test with rigorous testing

During the actual test, the Dayu battery experienced thermal runaway three times, the temperature reached 1037°C, the pressure in the battery pack reached three peaks, and the maximum instantaneous pressure was about 16kPa, but it still ensured the excellent safety performance of no fire and no explosion. At the same time, the fire extinguishing box design in the safety position of the tail also successfully controlled the maximum temperature of the overflowing smoke below 100°C to avoid secondary damage to the surrounding area.

In the actual test, there was no open flame spillage or explosion.

Whether it is a brand-new design concept or outstanding performance in rigorous tests, Dayu Battery has achieved comprehensive leadership in safety. In addition, Great Wall Motors has also made disruptive innovations in the design and development process using Dayu Battery as a carrier.

Dayu's battery solution design has pioneered the construction of a whole-pack-level thermal runaway combustion model, using multi-dimensional fitting simulation of airflow and fire flow, filling the gap in the industry and overturning the traditional method of first developing and then testing in the field of thermal runaway. It has achieved full digital thermal runaway virtual simulation without real pack conditions, effectively controlling battery safety design results, and while further improving R&D efficiency, it has also provided a solid foundation for more subsequent upgrades to battery safety technology.

Patented technology is open to the public for free, empowering the overall development of the battery industry

At the industry level, the new concepts of isolation, drainage, commutation, and self-extinguishing proposed by Great Wall Motors not only ensure the further upgrade of battery safety compared to the current mainstream design ideas, but also achieve a multi-faceted balance in terms of cost control, battery power layout, and energy density, and better meet the various needs in practical applications. With the support of various technical advantages, Dayu Battery plans to be officially applied in 2022 for the next generation of new electric vehicles and installed in Great Wall Motors' new energy series models.

Dayu Battery plans to achieve full application in 2022

If Dayu Battery's new technology is a great surprise to the new energy vehicle market, which has long been unable to overcome the pain point of battery safety, then its major move of free and open patents will further transform technological surprises into industry wealth and empower the overall development of the battery industry.

Dayu Battery opens patents for free

In the current new energy vehicle market, as competition among various models and brands becomes increasingly fierce, technological advantages will undoubtedly become an important foundation for meeting consumer demand and achieving breakthroughs for automakers. At the same time, due to the different design concepts of different automakers, it is impossible to accurately focus on R&D. As the market continues to heat up, there is still a lot of room for breakthroughs in many battery technologies.

This time, Great Wall Motors takes Dayu Battery as an opportunity to promote the free opening of patents. While actively eliminating technical barriers and realizing the sharing of results, it will also play a great guiding role in the development of the industry through new safety technology concepts.

The new launch of Dayu Battery, through innovative battery safety design concepts and open patented technology, not only reflects Great Wall Motors' strong strength as a technology leader in its own brands, but also highlights Great Wall Motors' corporate style of always putting consumers first. We believe that with the continuous deepening of technological research and development, Dayu Battery will inject more impetus into the battery industry and provide new energy users with a safer and more convenient travel experience.