Improving the energy density of battery system is a systematic project, which can be started from the development of new materials, optimization of battery structure, improvement of manufacturing process, etc.

Change the specification of rechargeable battery

Changing the specification of rechargeable batteries is also a major aspect of expansion. For example, by changing the length and overall width of the rechargeable battery, the lithium-ion battery will become more flat and narrow in a certain volume, which is conducive to the overall layout of the lithium-ion battery in the battery pack, and can improve the space utilization of the power lithium-ion battery, and generate a battery pack with greater specific energy. This planar design scheme can also make the lithium ion core have a large total heat removal area, so that the lithium ion core can immediately transfer the heat generated inside to the outside world, prevent the heat generated inside from gathering, and better match the higher specific energy. Therefore, how to improve the specific energy of rechargeable batteries according to the changes in battery specifications is also the main content of our research.

Application of light raw materials

In the application of raw materials, in addition to the upgrading of lithium-ion battery materials, the improvement of battery pack materials is also an important measure to increase the proportion of energy and rechargeable battery system software. At present, most battery boxes are made of aluminum alloy materials, high-strength steel materials and polymer materials. The relative density of aluminum alloy profile is relatively small, only one third of the steel. Replacing steel with aluminum alloy profile can significantly reduce the net weight of the battery, while aluminum alloy profile will continue to produce a layer of high-density, stable oxidation air film, which has corrosion resistance, and is a high-quality lightweight battery raw material; High strength steel and high strength steel rechargeable battery shell can be lighter and have lower cost, which is better than traditional high carbon steel raw materials; Thermoplastic polymer materials can not be used repeatedly, but also have low cost and good ductility. It is an ideal raw material for battery shell. At present, it has been widely used in battery packs.