LR1121 battery!Power battery research and development should be combined with the development trend of electric vehicles

"The performance of the power battery of pure electric vehicles should be towards a cruising range of more than 600 kilometers, a fast charging capability that can fully charge 80% of the electricity in 10 minutes, a lifespan of more than 15 years, high and low temperature performance between minus 40 degrees Celsius and 70 degrees Celsius, and a safety prediction function. Lower battery pack height to improve passenger comfort

"The performance of the power battery of pure electric vehicles should be towards a cruising range of more than 600 kilometers, a fast charging capability that can fully charge 80% of the electricity in 10 minutes, a lifespan of more than 15 years, high and low temperature performance between minus 40 degrees Celsius and 70 degrees Celsius, and a safety prediction function. Efforts should be made to reduce the height of the battery pack to improve passenger comfort." Recently, Wang Yu, chairman of Funeng Technology (Ganzhou) Co., Ltd., expressed his expectations for future power battery performance at the 4th International Summit on Power Battery Applications.

Power battery research and development should be closely related to cars

The subsidy policy for new energy vehicles is about to be withdrawn, which will give power battery companies a certain degree of relief in the competition to "sprint" on energy density indicators. Power battery companies can finally breathe a sigh of relief and calm down to seriously think about the future.

At the meeting, participants generally believed that power battery companies should closely integrate with the development trend of electric vehicles when conducting technology selection and research and development, and seize the "hand of God" of downstream vehicle companies.

“It is necessary to direct the technological development direction of battery companies through user needs fed back from vehicle companies.” Yao Wanhao, deputy general manager of Jiangsu Tafel New Energy Technology Co., Ltd., pointed out at the meeting.

Liang Rui, vice president of Sunwanda Electronics Co., Ltd. and president of Sunwanda Electric Vehicles, said that in recent years, my country's power battery industry has indeed made great achievements, but the safety, cost and quality of some products of the battery have been far behind. There is still a gap in market demand.

"At present, the manufacturing level of the domestic battery industry is still at the third-tier level, and there is still a gap between the industrial grade and the automotive grade. The specific manifestation is that the qualification rate of most companies' products is very low, about 90%, and the waste is relatively large. Japanese and Korean companies usually It is two to three percentage points higher than that of domestic companies, and can even reach more than 95%. Manufacturing costs have become the main reason for high battery costs." said Yang Rukun, chairman of Shenzhen Jiyang Intelligent Technology Co., Ltd.

Liu Jincheng, chairman of Huizhou Yiwei Lithium Energy Co., Ltd., believes that the next generation of lithium battery technology must be closely related to the next generation of electric vehicles; the next generation of battery people should be car people, that is, they should follow the requirements of cars. Only by planning the behavior along the industrial development path can the power battery industry develop healthily. The most critical requirement is to be safe and reliable. Safety and reliability are the natural attributes of power batteries. The so-called natural attributes must be possessed first. The battery must be safe and reliable before it can be used as a power battery.

Li Yong, chairman of Fengfan Co., Ltd., shares the same view. He believes that it is necessary to focus on key technologies and seek breakthroughs while adhering to the bottom line of quality.

Wu Feng, an academician of the Chinese Academy of Engineering, suggested that battery companies should cooperate with vehicle, material, and equipment companies to develop battery materials, production processes, etc., develop different models and supporting different battery products according to market demand, configure different production capacities, and improve production capacity utilization.

Steadily increase energy density under the premise of safety

The development of new energy vehicles is about to enter a subsidy-free era. Although the energy density of power batteries has been "relaxed" to a certain extent, this does not mean that power batteries will stop marching towards higher energy density goals in the future, but should ensure safety. In line with the actual market demand, the energy density will steadily climb to a higher peak.

In recent years, ternary batteries have developed rapidly, with some products having an energy density exceeding 300 Wh/kg; lithium iron phosphate has made progress in high-pressure silicon carbon anodes, with an energy density of up to 200 Wh/kg.

Wu Feng pointed out that in the future, high-energy lithium-ion batteries will use lithium-rich manganese-based materials, and the energy density can exceed 400 Wh/kg, and can break through the boundaries of single-electron reactions and become multi-electron reactions. At the same time, solid-state batteries will also become one of the future development directions.

At present, improving the energy density of power batteries is mainly achieved through structural adjustment or optimization of battery cathode materials and anode materials. For example, the cathode material is switched from lithium iron phosphate to ternary materials.

Sun Chunsheng, manager of the technical department of Xianghe Kunlun Chemical Co., Ltd., pointed out that even ternary materials, in pursuit of higher energy density, have transitioned from NCM333 to NCM523, and then gradually transitioned to NCM622 and NCM811. High-nickel materials such as NCM811 also have higher technical requirements for electrolytes and negative electrode materials. Therefore, it is very necessary to conduct basic theoretical research and innovation in advance.

To this end, Kunlun Chemical's product research and development plan mainly focuses on liquid electrolytes, focusing on the research and development of special lithium salts and additives. In addition, it will also focus on the research and development of all-solid electrolytes.

Zhou Jiang, executive vice president and director of the research institute of Tianjin Lishen Battery Co., Ltd., said that the difficulty of high-specific energy batteries lies in balance. In terms of key indicators of power batteries, such as the energy window, the choice of 0 and 1 is to ensure that energy needs are met.

For example, for high-nickel materials, circulation or storage under high temperature conditions is prone to problems such as gas generation and cracking, and the safety is insufficient. Moreover, silicon materials are prone to problems such as expansion, so the perfect balance point must be found during the design stage.

Improving energy density and safety can also be achieved through new processes. Hou Min, vice president of Ruipu Energy Co., Ltd., introduced that during the system design stage, Ruipu Energy constructed a five-level and four-dimensional safety matrix diagram to establish electrical characteristics, structural characteristics, Thermodynamic and electrochemical properties, controllable safety design principles and specifications, effectively guide product design and development.

It also adopts industry-leading step-free die-cutting technology to effectively improve the specific energy and safety of the product. By introducing interface solidification technology and low-heat and low-impedance technology, it effectively improves the consistency and cycle life of the product.