Improving the energy density of lithium battery system can make lithium battery work better and give full play to its performance. Then how to improve the energy density of lithium battery system? Let's take a look.
Methods to improve the energy density of lithium battery system
1. Reinforced lithium cell material
With different organic chemical management systems, you can change specific energies. For example, in the cathode material of lithium ion battery, the occupation rate of nickel, cobalt and manganese is adjusted to increase the occupation rate of nickel, thus improving the specific energy of lithium ion battery. In the cathode material of lithium-ion battery, the volume of silicon/carbon polymer material can reach 4200mah/g, while the basic theoretical capacity of lithium-ion battery is only 372mah/g. In addition, many lithium-ion batteries have volume damage in the whole process of a battery charge, and some lithium-ion batteries are damaged in the whole process of the whole cycle system. Therefore, the filling technology of lithium elements in lithium ion batteries or electrolyte of lithium ion batteries is also the main research content of new batteries.
2. Optimize the layout structure
At present, most of the battery are various fixed in the battery pack various fixed card, the structure of the support element method, a lot of structure element has a lot of volume and quality, greatly reduces the overall integration of high efficiency, adjust the structure of the battery pack arrangement, simplifies the various installation support structure, can make the room of lithium-ion battery pack in the relatively limited space to have high volume. This year of CTP (celltopack) plan, change the structure of the touch of lithium ion battery pack in the past, through several large space of the lithium ion battery pack form a standardized battery pack, then intelligently piled into a bigger battery control module, the programs not only reduces the total number of components, and can greatly improve the space utilization and than. Therefore, simplifying the structure of rechargeable battery pack and forming the secondary integration scheme of lithium ion battery pack have become the technical direction chosen by many enterprises.
3. Change the specifications of rechargeable batteries
Changing the specifications of rechargeable batteries is also a major aspect of the expansion. For example, by changing the length and total width of the rechargeable battery, the lithium ion battery becomes smoother and narrower in a certain volume, which is conducive to the overall arrangement of the lithium ion battery in the battery pack, and can improve the space utilization rate of the power lithium ion battery, and produce a larger battery pack than the energy. This kind of plane design scheme can also make the lithium ion core have a large total heat drainage area, so that the lithium ion core can immediately transfer the heat generated inside to the outside world, prevent the heat generated inside to accumulate, and better match the higher specific energy. Therefore, how to improve the specific energy of rechargeable batteries according to the changes of battery specifications is also the main content of our company's research.
4. Application of lightweight 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 a measure to improve the ratio of energy to rechargeable battery system software. At present, aluminum alloy, high strength steel and polymer materials are used in the battery box. The relative density of aluminum alloy profiles is small, only one-third of the steel, using aluminum alloy profiles instead of steel can significantly reduce the net weight of the battery, and aluminum alloy profiles will continue to produce a layer of high density, stable oxidized air film, with corrosion resistance, is a high-quality battery light raw material; High strength steel, high strength steel rechargeable battery case can be lighter, and the cost is also lower, better than the traditional high carbon steel raw materials; Thermoplastic polymer material can not be used repeatedly, and low cost, good ductility, is an ideal battery shell raw material, has been widely used in the current stage of battery pack.
