/PRZWT/April 25, 2024, Shenzhen - In 2020, Tesla officially proposed the 4680 large cylindrical battery technology, which through the stepless ear (also known as the all-polar ear) technology, innovatively solved the problem of internal resistance and heat generation after the cylindrical battery increased in size, and met the performance requirements of high energy density and high power.
The large cylindrical battery is designed with a steel shell, which has good compatibility with the ultimate chemical system, low manufacturing cost, and easy standardization. It is increasingly favored by the mid-to-high-end passenger car market. Most car companies use large cylindrical batteries as one of their main routes.
It is worth noting that although the electrodeless ear battery technology solves the problem of the current path of the cylindrical battery, the electronic transmission path brought by the positive and negative pole different side design is still too long, resulting in a large internal resistance, and is limited by traditional materials and process design. It cannot meet the extreme needs of high-end passenger car app stores.
Recently, domestic battery companies have taken the lead in the innovation of large cylinder technology, leading the new trend of large cylinder technology based on transformative innovations at the structural and material levels. On April 19, Zhengli Xinneng released the world's first dual semi-solid large cylindrical battery - "Zhengli · Qilong" large cylindrical battery system. The battery adopts the three core technologies of "pole ring, pole cover and pole state" created by Zhengli Xinneng, which integrates ultra-safe, ultra-high energy density, and ultra-fast charging technology with a 1 million-kilometer long life and a 500-kilometer battery life in 10 minutes. It supports pure electric MPV models, with a full battery life of more than 1,000 kilometers, and the battery pack capacity is as high as 170kWh. It is currently the battery system with the largest power in domestic passenger car batteries.
Crack the pain points of the industry, Zhengli Xinneng originates three polar cell technologies
Data show that in the first quarter of this year, the sales of new energy vehicles in the Chinese market reached 2.09 million, and the penetration rate of new cars exceeded 30%. With the popularity of new energy vehicles, the demand for high-end passenger cars is increasing, and mainstream car companies have launched high-end models to attract consumers. At the same time, BMW, Volkswagen, Mercedes-Benz and other overseas car companies are also up the ante high-end passenger car layout.
At this stage, limited by battery materials, design and process problems, mainstream batteries are still unable to meet the extreme demand for battery life, charging speed, safety and service life of high-end passenger cars. Based on the LISA3-2-1 research and development strategy, Zhengli New Energy targets the pain points of the high-end passenger car market demand, relying on the positive energy technology battery system, launched 46 series large cylindrical batteries, with a cell cell capacity of 49.5Ah.
According to Zhengli Xinneng, the large cylindrical battery cell is the result of the company's innovation based on materials, structure, design and process equipment, and through three innovative forms of "polar energy ring, polar energy cover and polar energy state".
Polar energy loop technology: The positive and negative electrodes of the traditional 4680 cylindrical battery core are designed with different sides, the electronic transmission path is too long, and the internal resistance is too large. Zhengli Xinneng's original technology of the same-side outlet ear greatly shortens the electronic transmission path and reduces the ohmic resistance. It is reported that in order to realize the structure of the same-side outlet ear, Zhengli Xinneng has developed a closed-loop cylindrical manufacturing equipment with integrated laser die-cutting and winding, which solves the technological problems of the same-side outlet ear and realizes a comprehensive upgrade of the product. Compared with the stepless ear technology, the electronic path of the large cylindrical battery cell of the polar energy ring technology is shortened by 80%, the ohmic impedance is reduced by 30%, and the volume utilization rate is increased by 3%.
Extreme cover technology: Zhengli Xinneng upgrades the traditional fluororubber sealing ring design to etching nano-injection molding technology, which can reduce the cost by 10% compared to the traditional top cover integration technology; PPS forms a nano-scale anchor structure and chemical bond on the surface of the top cover and pole, and the helium gas tightness is improved by two orders of magnitude, which is 100 times the level of the traditional sealing ring, thus improving the space utilization rate of the battery cell and the reliability of the whole life cycle.
Extreme energy technology: namely dual semi-solid cell technology: solid electrolyte surface modification technology for ultra-high nickel cathode materials, solid electrolyte composite diaphragm. Thanks to the blessing of dual semi-solid technology, the thermal stability of large cylindrical cells has been significantly improved, the failure initiation temperature has been increased by 10 degrees, and the maximum temperature after failure has been reduced by 150 ° C. In addition, while the safety has been improved, the power performance of the cells has also been improved, and the low temperature power of minus 20 ° C has been increased by 20%.
It can be seen that, based on the good compatibility of large cylinders with extreme chemical systems, as well as the company's innovative research and development of battery material technology, Zhengli Xinneng uses ultra-high nickel for the positive electrode and silicon carbon for the negative electrode. At the same time, it takes the lead in applying solid-state electrolyte surface modification technology and solid-state electrolyte composite membrane technology in the industry, making the company's 46-cylinder battery cells with an energy density of 306 Wh/kg, which is at the leading level in the industry.
In terms of structural and design innovation, Zhengli Xinneng has created the same-side outlet ear battery cell technology, which solves the problem of large internal resistance of existing 4680 cylindrical batteries. At the same time, it has pioneered nano-injection molding technology, which not only improves the space utilization rate of battery cells and the reliability of the whole life cycle, but also reduces the cost of battery cells.
Based on its pioneering innovation capabilities in materials and structures, Zhengli New Energy has also carried out related technology layout simultaneously. As of now, Zhengli Extreme Cell Technology has issued 291 patents, including 25 for nano injection molding, 64 for high nickel + silicon carbon, 16 for semi-solid technology, 125 for cylindrical cell technology, and 61 for cylindrical battery pack technology.
170kWh leads the ultra-long battery life, Zhengli Qilong has a new definition of "three super and one fast"
Unlike the current industry's use of large cylindrical battery technology, Zhengli Xinneng pioneered the same-side outlet ear, nano injection molding, and dual semi-solid state technologies, which solved the current industry pain points of large cylindrical batteries and further explored the performance, safety, and cost limits of large cylindrical batteries. With an energy density of 306Wh/kg, a single cell capacity of 49.5Ah, and 4C ultra-fast charging performance, it meets the extreme needs of high-end passenger cars.
Relying on three original technologies, based on Zhengli Xinneng's 46 series cylindrical cells, Zhengli Xinneng's "Zhengli Qilong" large cylindrical battery product has a capacity of 170kWh, setting a record for the current domestic new energy passenger car battery pack capacity. However, the battery capacity is only a microcosm of Zhengli Xinneng's innovation at the system level. "Zhengli Qilong"'s innovation in safety, life, fast charging, CTC structure design, etc. is also remarkable.
In terms of safety, how to ensure the safety of ultra-high-power products at this stage is the "Everest" of large-capacity products. In addition to using the extremely safe 46 large-size cylindrical cells, Zhengli Xinneng has also carried out multiple safety designs at the system level:
The first is to apply thermoelectric separation technology: when the battery cell fails, the explosion-proof valve erupts downward to ensure the safety of the passenger compartment, and is isolated from the electrical connection area up and down to prevent secondary short circuits, and still ensure the normal operation of the monitoring system.
Secondly, multiple side thermal protection technology is applied to achieve non-thermal diffusion (NTP) at the battery pack level.
System energy level, based on 306Wh/kg ultra-high energy density cylindrical cells, Zhengli Xinneng uses the CTC design of the battery pack cover and the vehicle chassis integration in the system structure. The whole package has a power of up to 170kWh, which is currently the largest battery system for domestic passenger cars.
In order to prolong the cycle life of the battery system, Zhengli Qilong adopts system efficient balanced thermal management to ensure the consistency of the battery working environment; multi-branch parallel design, the flow deviation of each branch is less than 3%; thermal resistance balance reverse design, fast charging conditions The temperature difference of the whole package of batteries is less than 5 ° C, so as to ensure that the whole life cycle of the vehicle can achieve a long battery life of 1 million kilometers.
In terms of fast charging, Zhengli Qilong adopts 800V high-voltage fast charging platform electrical design and system super thermal management. Among them, the 800V platform electrical design meets high-voltage and high-current fast charging; efficient thermal management, the maximum temperature rise of fast charging is less than 30 ° C; at the same time, BDU liquid cooling is integrated to ensure the working stability of electrical parts; Zhengli Qilong can support 4C fast charging, and the battery life is 500 kilometers in 10 minutes. Realize a full battery life of more than 1,000 kilometers for pure electric MPV models, and truly do it, travel thousands of miles, and reach it with one charge;
With a large capacity of 170kWh, the ultra-safe guarantee of NTP, the ultra-high system energy density of 245Wh/kg, the ultra-long life of 1 million kilometers, and the ultra-fast charging performance of 4C, Zhengli New Energy is redefining "three super and one fast", leading the new trend of high-end passenger car battery technology with extreme performance.
The "Zhengli · Qilong" battery system has also been installed and tested in 2023, and has been submitted to a third-party authoritative testing agency by the vehicle factory for inspection. The battery cells and battery packs have obtained a number of testing certificates. In the future, with the "Zhengli · Qilong" battery providing extreme performance and experience, more high-end models will be equipped one after another, which will surely continuously enhance the competitiveness of Zhengli New Energy in the global battery market.
It is reported that in 2023, Zhengli Xinneng officially released the long-term R & D technology strategy of "LISA-321", and laid out a Product Research & Development system covering the whole ecology and application scenarios of "land, sea and air". On this basis, Zhengli Xinneng continues to practice the exploration of electrochemical material differentiation, provide standardized battery cell solutions, and help car companies realize the platformization of battery packs and implement the long-term strategy of multi-path balanced development.
At present, Zhengli New Energy has built a full-scenario, multi-path technology route and product matrix covering BEV, PHEV, EREV and HEV vehicles, energy storage, electric manned vehicles, electric ships, etc., and has conducted in-depth and comprehensive cooperation with global customers in various fields of sea, land and air.
