What level of power lithium battery cell technology has reached?

Benefiting from the expansion of the scale of production and sales of new energy vehicles and the increase in bicycle charge, the power lithium battery market has maintained rapid growth, and there is still a lot of room for development in the future. From January to May 2019, the installed capacity of power lithium batteries in the domestic market was 23.4GWh, a year-on-year increase of 83.9%. According to the estimation of the output of 5.9 million new energy vehicles in 2025, the demand for power lithium batteries will reach 330.6GWh, which is about 6 times the installed capacity in 2018. The current important development is the lithium iron phosphate material. Due to difficult process control and poor batch stability, it is difficult to control the battery manufacturing process, resulting in low cell yield and poor battery consistency. From the data we detected, the performance of domestic battery cells is not worse than that of foreign batteries, but after grouping, this gap first appears in terms of battery pack life. The cost of power batteries is the core point of current pure electric vehicles, which determines whether they can find a balance in the scale effect and grow longer: this is the first round of attempts by domestic companies to make LFP batteries before. It can be based on the characteristics of buses. In the case of supplementing the height limit, our country's belt heart company made the first round of attempts, but the most important development trend is that it is not suitable for passenger cars. Faced with the battery system placed on the chassis, the height is absolutely restricted. Thickening: This is generally done on the PHEV2 specification. The important idea is to integrate the parallel connection of the battery cells in the battery core, and achieve the effect of large capacity through the parallel processing of the winding cores; Widening: making the length longer From the perspective of heat dissipation, it is a compromise under the condition that the heat capacity of the winding core and the heat dissipation shell remains relatively consistent. Here, the electrical connection loss of the connection winding core is sacrificed to ensure that the battery core can perform heat dissipation and safety. Official data show that the energy density of the square shell cell has reached 240Wh/kg at this stage, and the technical plan is to increase the cell energy density to 300Wh/kg before 2020. While increasing the energy density through the 811 ternary positive electrode + silicon/carbon hybrid negative electrode, the cycle, high temperature performance, cost, safety, etc. must be sacrificed, and the production process and environmental requirements are relatively harsh. There are many types of square shell batteries. According to customer requirements, the battery company can tailor-made in terms of capacity, shape and size. Taking into account the difference in the formulation of the positive and negative materials, the energy density between the square shell cells of the same specification is more comparable. The gap between the leading companies of square-shell power lithium battery companies at home and abroad may be small in terms of cell energy density. Perhaps from the perspective of this technical condition alone, my country may not lag far behind. With the improvement of 18650 power cell automation and intelligent production level and downstream car companies' demand for high-energy density batteries, 18650 battery company is moving towards high-capacity cell products above 3.0AH. According to statistics, there are currently more than 20 companies in China that have mass-produced 18650 power cells. However, due to factors such as capital, technology, output, process, and equipment, there are not many companies that can finally mass produce 18650 power cells above 2.6AH. Although major battery companies have their own main products, they will be involved in research and development to varying degrees. Perhaps the current market determines the types of products that the company promotes, but in the long run, there is no single technical route. Nowadays, news of capital injection and company mergers and acquisitions in the power lithium battery industry are constantly emerging. Various battery concepts and laboratory breakthroughs have continued, and technical routes have their own advantages and disadvantages. In the end, it is the company's own strengths, market selection, and product talk. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Are electric vehicles an important factor in promoting the development of automotive lithium batteries?