How to increase the energy density of the lithium-ion battery system? Improving the energy density of a lithium-ion battery system is a systematic project that can start from the development and design of new materials, the improvement of rechargeable battery structure, and the improvement of processing and manufacturing processes.
1. The upgraded battery cell material adopts different chemical systems, which can change the energy density. For example, increase the proportion of nickel, cobalt, and manganese based on adjusting the proportion of nickel, cobalt, and manganese in key battery cathode materials. The silicon/carbon polymer material on the anode material reaches 4200Mah/g, while the basic theoretical volume of the anode material in the lithium battery is only 371mah/g, which is much lower than the silicon/carbon polymer material. In addition, many lithium-ion batteries have capacity loss during the first charge, and some lithium ions may be lost during the cycle. Therefore, the technology of replenishing lithium in the electrode or electrolyte is also a major research direction of current battery technology.
2. The most common lithium-ion battery pack in the sales market is a small module + various fixings and supports in the battery pack. Many parts and components occupy a lot of volume and quality, which greatly reduces the overall integration and high efficiency. Adjusting the packaging structure and simplifying the installation support point structure can make the key components more compact, and the volume of the lithium-ion battery package is higher in a relatively limited indoor space. The ctp (lithium-ion battery package) plan announced by the battery brand this year changed the original key component-the structure of the lithium-ion battery package. The lithium-ion battery package is composed of multiple large-capacity lithium-ion batteries, and the lithium-ion battery packs are stacked. A very large part. Compared with traditional lithium-ion battery packs, this plan not only reduces the total number of parts, but also reduces the indoor space and specific energy usage. Therefore, simplification of the structure of lithium-ion battery packs and the emergence of a secondary integration plan for lithium-ion battery packs has become the technical orientation that many companies tend to choose.
3. Changing the specifications of lithium-ion battery packs Changing the specifications of lithium-ion battery packs is also a key aspect of expansion. For example, according to changing the length and total width of lithium-ion battery packs, the key is becoming more and more flat and narrow, which is beneficial to the spatial layout of lithium-ion battery packs, improves the high efficiency of indoor space of lithium-ion battery packs, and improves lithium-ion battery packs The specific energy. The advertising design can also make the key have a large total heat rejection area, so that the key can immediately transfer the internal heat to the outside world, guard against the accumulation of internal heat generation, and then match the higher specific energy as soon as possible.
4. The use of lightweight materials in the use of materials, in addition to the upgrade of lithium-ion battery materials, the improvement of rechargeable battery assembly products is also a key way to increase the specific energy of the rechargeable battery system software. The use of lightweight materials has become a key approach. At this stage, the battery box materials usually use aluminum alloy materials, high-strength steel plate materials and polymer materials. Aluminum alloy has a low density, only about one-third of stainless steel plates. Using aluminum alloy profiles instead of stainless steel plates can clearly reduce the net weight of lithium-ion battery packs. A high-density and stable air oxide film will appear on the surface of aluminum alloy profiles. Corrosion-resistant, high-quality battery box materials. The compressive strength of high-strength steel materials can be very high, and the high-toughness rechargeable battery shell can be lighter, lower cost, and good plasticity. It is an ideal battery box material, and it has been widely used in battery packs.
Post time: Aug-20-2021
