1800mah 18650 battery

What level has the domestic 1800mah 18650 battery technology reached?

Lithium-ion battery manufacturers explain what level has the domestic 1800mah 18650 battery technology reached? 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 product consistency is not easy to quantify. If you want to evaluate the technical level of power lithium battery companies, comparing the energy density of the battery cells is the most intuitive method.

Lithium-ion battery manufacturers explain what level has the domestic 1800mah 18650 battery technology reached?

Benefiting from the expansion of the production and sales scale of new energy vehicles and the increase in the amount of electricity per vehicle, the power lithium battery market has maintained a high-speed 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, an increase of 83.9% year-on-year. According to the calculation that the output of new energy vehicles will be 5.9 million in 2025, the demand for power lithium batteries will reach 330.6GWh, about 6 times the installed capacity in 2018.

The important development at present is lithium iron phosphate material. Due to the difficulty in process control and poor batch stability, the battery manufacturing process is difficult to control, resulting in low battery cell yield and poor battery consistency. From the data we have tested, the performance of domestic battery cells is not worse than that of foreign batteries, but after being grouped, this gap first appears in the battery pack life.

The cost of power cells is the core point of current pure electric vehicles, which determines whether a balance can be found in terms of scale effect.

Lengthening: This is the first round of attempts by domestic companies to make LFP cells. In view of the characteristics of buses, the height restrictions can be made up. my country's companies with inner cores have made the first round of attempts, but the biggest overall trend of this development is that it is not suitable for passenger cars. Facing 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 cells in the cells, and achieve the effect of increasing the capacity through the parallel connection of the cores;

Widening: From the perspective of heat dissipation, lengthening is a compromise consideration under the condition that the heat capacity of the core and the heat dissipation shell remain relatively consistent. Here, the electrical connection loss of the core connection is sacrificed to ensure that the cells can be carried out at the heat dissipation and safety levels.

Official data shows that the energy density of square shell cells has reached 240Wh/kg at this stage, and the technical plan is to increase the energy density of the cells to 300Wh/kg before 2020. While improving the energy density through 811 ternary positive electrode + silicon/carbon mixed 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, battery companies can customize them in terms of capacity, shape and size. Considering the differences in the formulation of positive and negative electrode materials, the energy density between square shell cells of the same specification is more comparable. The gap in cell energy density between leading square shell power lithium battery companies at home and abroad may be very small. Perhaps from this technical condition alone, my country may not lag behind too much.

With the improvement of the automation and intelligent production level of 18650 power cells and the demand of downstream car companies for high energy density batteries, 18650 battery companies are moving towards high-capacity cell products above 3.0AH. According to statistics, there are currently more than 20 companies in China that can mass-produce 18650 power cells. However, due to factors such as funding, technology, output, process, and equipment, not many companies can eventually mass-produce 18650 power cells above 2.6AH.

Although major battery companies have their own main products, they are involved in R&D to varying degrees. Perhaps the market determines the type of products that the company promotes at this stage, but in the long run, there is no single technical route. Today, there are endless news about capital injections and company mergers and acquisitions in the power lithium battery industry. Various battery concepts and laboratory breakthroughs continue. Technical routes have their own advantages and disadvantages. In the end, each company is good at what it can do, the market chooses, and the product speaks.

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