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Strive for Technology to Solve the Problem of Energy Supplementation of New Energy Vehicles

日期: 2022-07-15
浏览次数: 0

Faced with the still existing mileage anxiety and diversified application scenarios, the industry put forward two technical directions: battery body integration and power exchange, which added new ideas for solving the problem of energy supplement of new energy vehicles.

Battery integration is becoming a trend.

With the popularity of BYD seals, the popularity of battery-body integration technology has been pushed up again.

Seal is a heavy-duty model launched by BYD Ocean Department not long ago. Because CTB(cell to body) battery body integration technology is adopted for the first time, it has fully evolved in terms of safety, handling and comfort.

Lian Yubo, president of BYD Automotive Engineering Research Institute, said that BYD's previous blade battery adopted CTP(cell to package) scheme, which consisted of tray, cell and battery top cover from bottom to top, but it was separated from the body floor. Now CTB technology combines the battery top cover with the body floor on the basis of CTP.

This improvement has greatly improved the performance of BYD Seal.

First of all, BYD Seal's CTB battery body integrated structure cancels the traditional CTP three-layer plywood, which reduces the body height, makes the body more beautiful, and reduces the wind resistance coefficient, thus reducing the vehicle's energy consumption.

Secondly, the integration of battery and car body can reduce the steel consumption and simplify the chassis structure of the vehicle. At the same time, the honeycomb structure composed of rows of blade batteries also greatly enhanced the chassis strength, and the torsional stiffness of the whole vehicle reached 40,000 Nm/degree.

Not only that, CTB battery body integration is combined with BYD's e 3.0 pure electric platform, but also the flat design of the vehicle chassis is realized. The weight ratio of the front and rear of the vehicle is 50: 50, which greatly enhances the maneuverability.

In addition, the biggest advantage of CTB structure is that it increases the density of battery arrangement, which is conducive to increasing the battery capacity from the physical space, thus increasing the cruising range of the vehicle.

In fact, in order to further reduce the weight and cost, the structure of the power battery system is constantly innovating, and the integration of battery body is becoming a trend, and more and more car companies are making efforts.

At the beginning of May this year, Zero-Run Car announced that it had conquered CTC(Cell to Chassis) technology and applied it to C01. Different from BYD's CTB, the CTC scheme of zero-running car cancels the battery pack box and the upper cover, leaving only the lower tray, which is closely connected with the doorsill and beam, forming a highly rigid cavity structure with the battery compartment of the car body.

Zhu Jiangming, CEO of Zero Run Car, said that the CTC technology of Zero Run Car was inspired by the change of cell phone battery structure from separated to integrated body battery, and the thinner and lighter structural design can bring corresponding optimization to the cost of the whole vehicle, cruising range and cockpit space.

In fact, Tesla was the first car company to integrate CTC battery body. In September, 2020, Tesla released 4680 batteries, CTC technology and integrated die casting technology, and announced that its Berlin plant would adopt CTC technology to produce Model Y.

In addition to car companies, there are also power battery manufacturers in the battery body integration technology.

On June 23rd, Contemporary Amperex Technology Co., Limited officially released the third generation CTP technology, and announced that a new product named 'Kirin Battery' will be mass-produced and listed next year.

According to the official data of Contemporary Amperex Technology Co., Limited, compared with the previous battery Bao Butong, this battery adopts chassis packaging, integrated frame and other technologies, so as to make full use of space to increase the battery density, thus 'producing extraordinary energy efficiency ratio'. Reflected in the data, the volume utilization rate of this battery is 72%, the energy density is 255Wh/kg, the whole vehicle life reaches 1000 kilometers, and it can support 5 minutes of fast hot start and 10 minutes of fast charge of 80% electricity.

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