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Lithium ion battery manufacturers interpret the level of domestic power lithium battery cell technology? On the premise of ensuring safety, improving energy density, reducing production costs and improving product consistency are topics of widespread concern in the power lithium battery industry. The production cost curve is constantly fluctuating, and the product consistency is not easy to quantify. To evaluate the technical level of power lithium battery companies, comparing the energy density of cells is the most intuitive method.

Lithium ion battery manufacturers interpret the level of domestic power lithium battery cell technology?

Benefiting from the expansion of the production and marketing scale of new energy vehicles and the improvement of the electrification capacity of single vehicles, the lithium battery market has maintained a rapid growth, and there is still large room for development in the future. From January to May 2019, the installed capacity of power lithium batteries in the domestic market was 23.4 GWh, up 83.9% year on year. According to the production of 5.9 million new energy vehicles in 2025, the demand for power lithium batteries will reach 330.6 GWh, about 6 times the installed capacity in 2018.

At present, lithium iron phosphate material is an important development. Due to the difficulties in process control and batch stability, it is difficult to control the battery manufacturing process, resulting in low cell yield and poor battery consistency. From the data we have detected, the performance of domestic battery monomer is not worse than that of foreign batteries, but after grouping, the gap first appears in terms of battery life.

The cost of power cell is the core point of current pure electric vehicle, which determines whether to find a balance point in scale effect

Longer: This is the first round of LFP battery cell attempts made by domestic companies before. Under the condition that the height can be supplemented and limited according to the characteristics of the bus, Chinese companies with hearts have made the first round of attempts. However, the biggest trend of this development is that it is not suitable for passenger cars. Facing the battery system on the chassis, the height is absolutely limited;

Thickening: This is generally done on the PHEV2 specification. The important idea is to integrate the parallel connection of the cell into the cell, and achieve the effect of large capacity through the parallel processing of the coil core;

Widening: from the perspective of heat dissipation, lengthening is a compromise consideration under the condition that the heat capacity of the coil core and the heat dissipation shell are relatively consistent. Here, the electrical connection loss of the connecting coil core is sacrificed to ensure that the core can be conducted at the level of heat dissipation and safety.

Official data show that the energy density of square shell cells has reached 240Wh/kg at this stage. The technical plan is to increase the energy density of cells to 300Wh/kg by 2020. While improving the energy density through 811 ternary anode+silicon/carbon mixed anode, the cycle, high temperature performance, cost, safety, etc. have to be sacrificed, and the production process and environmental requirements are also relatively strict.

There are many kinds of square shell batteries. According to customer requirements, battery companies can customize their capacity, shape and size. In consideration of the difference in the formula of positive and negative electrode materials, the energy density between square shell cells of the same specification is more comparable. The gap between domestic and foreign leading companies of square shell power lithium battery in cell energy density may be very small. Perhaps from this technical condition alone, China may not be far behind.

With the improvement of automation and intelligent production level of 18650 power cell and the demand of downstream vehicle enterprises for high energy density battery, 18650 battery company is moving towards the layout of high capacity cell products above 3.0AH. According to data statistics, there are more than 20 companies in China that have mass production of 18650 power cells. However, limited by capital, technology, output, process, equipment and other factors, there are not many companies that can finally mass produce 18650 power cells above 2.6AH.

Although the major battery companies have their own main products, they will have different degrees of involvement in research and development. Perhaps the market at this stage determines the type of products the company mainly promotes, but there is no unique technical route in the long run. Today, the news of capital injection and corporate mergers and acquisitions in the power lithium battery industry is endless. Various battery concepts and laboratory breakthroughs are continuous. The technical route has its own advantages and disadvantages. Finally, the company is good at what it can, market choice, and product talk.

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