Frontline | EVE Energy's large cylindrical batteries have been installed in over 32,000 vehicles, and each vehicle has traveled over 210,000 kilometers.

Recently, the 21st Shanghai International Automobile Industry Exhibition (hereinafter referred to as the "Shanghai Auto Show") officially opened. EVE Energy Co., Ltd. showcased a series of core technology products at the exhibition, including OMNI all - purpose batteries, open - source batteries, aircraft batteries, robot batteries, and automotive electronics batteries.

Among them, the large cylindrical battery is the company's core product at this auto show. Jiang Jibing, the vice - president of EVE Energy and the director of the Battery System Research Institute, believes that the large cylindrical battery is the optimal solution for new energy vehicles and elaborated his views from multiple aspects.

The first is standardization. The large cylindrical battery meets the efficiency requirements of the automotive industry. Jiang Jibing believes that in the past 10 years of China's new energy vehicle industry, the core problem of the battery industry has been the mismatch of production capacity. How to reduce the diversification of batteries is a crucial step in improving the efficiency of the automotive industry.

Compared with square batteries, the large cylindrical battery has 10 times the manufacturing efficiency. The standardization of system component design and grouping process can make the battery a standard component of the automobile.

The second core value is in - situ upgrade. Given the current industrial situation where the product iteration cycle of new energy vehicles has been compressed to 12 - 18 months, the technical route of "fixed size + multiple chemical systems" of the large cylindrical battery can solve the problem between standardization and personalization.

It can be compatible with multiple chemical systems, such as lithium iron phosphate (LFP), lithium manganese iron phosphate (LMX), and ternary lithium (NCM), enabling flexible adjustment of power, endurance, charging time, and power. It can shorten the R & D time of the battery system to 3 - 6 months and reduce R & D costs by 80%.

The third core value is "zero expansion", making stress management a thing of the past. The circular structure and special materials of the large cylindrical battery enable it to maintain the same size throughout the battery's life cycle, eliminating the need for complex stress management design. The storage of the entire electronic system also becomes simpler. This is also the underlying logic for EVE Energy's firm choice of the large cylindrical battery for the in - situ upgrade path.

"Safety is a natural attribute of batteries." Jiang Jibing also said that EVE Energy's battery system, based on the superposition of 1500 - megapascal double - layer hot solid steel, 3500 - megapascal aerospace - grade glass fiber, and full - area foaming technology, can absorb up to 1000 joules of energy from bottom impacts on the entire electronic system, which is 6.6 times the new national standard.

Although the large cylindrical battery has multiple advantages in new energy vehicle applications, its production process standards and requirements are also very strict. EVE Energy was the first to mass - produce large cylindrical batteries and has overcome many technical difficulties, which Jiang Jibing also introduced one by one.

First is the low - temperature problem. After 4 years of R & D, EVE Energy has achieved new breakthroughs in low - internal - resistance technology and system heat - preservation and heating technology, enabling the large cylindrical battery to maintain a 25 - minute fast - charging capability at - 30°C and increase low - temperature endurance by 20%.

Second is high - precision grouping. A large cylindrical battery system often contains 700 - 800 batteries, and with the addition of double - sided liquid cooling and electrical connection structures, this has become a key threshold restricting high - precision grouping of the system.

EVE Energy has achieved a verticality control of 200μm in the height direction of the system grouping and a positional accuracy of 250μm in the horizontal direction, strictly controlling the dimensional accuracy to ensure uniform heat transfer, laying a foundation for the stable operation and reliable welding of the battery.

Third is reliable welding. In a large cylindrical battery pack, there are more than 1500 welding points, and each welding point is related to the reliability of the electrical connection of the battery cells. EVE Energy has achieved a welding penetration depth accuracy of 80μm, ensuring that each welding point can work stably and reliably.

Fourth is high - density foaming. The strength of the large cylindrical battery itself is 5 times that of the square battery. After the addition of full - area foaming technology, all gaps are integrated through foaming glue. The battery pack can achieve a torsional stiffness of more than 15000 NM, enabling the vehicle chassis to reach a torsional height of more than 50,000μm.

In addition, the 3 - degree temperature control management and a 1:4 foaming ratio ensure that the entire foaming process is controllable, further achieving high - density foaming and super - strong stiffness.

Jiang Jibing also revealed that EVE Energy's global patent network for large cylindrical batteries has covered 15 countries, with a cumulative application of more than 2300 patents, ranking first in the world in terms of the number of patents.

In terms of shipment volume, as the first domestic enterprise to mass - produce large cylindrical batteries, EVE Energy has delivered more than 32,000 vehicles for installation in the 15 months since large - scale mass production, with a zero - accident record of more than 210,000 kilometers per vehicle.

According to the press conference, EVE Energy's large cylindrical products have been supplied to many vehicle manufacturers, such as Changan, FAW, BMW, NIO, and Jianghuai. In the future, they will gradually enter the stage of large - scale delivery.