Market development prospects of domestic lithium battery packs

by:CTECHi     2021-08-11

Speaking of lithium battery packs, I believe most people are familiar with it. Recently, I have shared a lot of knowledge and technology about lithium battery packs. Today we are going to learn about the three major domestic lithium battery packs. I have listened carefully to the market development prospects and characteristics analysis. First study the development prospects of the three major domestic lithium battery pack markets: mainly divided into three levels: low-end market, mid-end market, and high-end market. 1. Low-end market The so-called low-end market of lithium battery packs refers to the lithium battery market with lower battery performance requirements represented by mobile phone batteries. Studies have shown that with China’s rapidly developing economy’s increasing demand for new battery materials, as well as the strong demand for new, high-efficiency and environmentally-friendly battery materials in mobile phones, notebook computers, and automobiles, lithium is currently and for a long period of time in the future. 57.4% of the demand for ion batteries comes from the mobile phone market. 2. Mid-end market The mid-end market of lithium battery packs refers to the lithium battery market with high battery performance requirements represented by laptop batteries and digital camera batteries. In my country, at present and for a long time in the future, 31.5% of the mid-end market demand for lithium-ion batteries will still come from notebook computers and other major digital products. 3. High-end market The high-end market of lithium battery packs refers to the lithium battery market with extremely high battery performance requirements represented by automotive power batteries. With the rapid development of new energy vehicles and electric bicycles in China, the lithium-ion battery market has also developed rapidly. Although the development prospects of new energy vehicles are good, the cost is still high. In addition, the technical requirements of power batteries are very high, which is undoubtedly a high threshold for manufacturers of lithium-ion batteries and their upper and midstream products. The electric bicycle and new energy vehicle market is currently one of the most promising lithium battery application markets. At present, many domestic manufacturers are actively investing in the construction of battery production lines. Therefore, actively researching and developing the advanced production technology of lithium battery pack cathode materials and mastering the core Ru0026D technology of lithium ion battery cathode materials will enable enterprises to occupy the limelight in the battery industry. Analysis of the characteristics of lithium batteries: battery internal resistance characteristics The ohmic internal resistance curve of lithium iron phosphate batteries presents the following characteristics: in the wider SOC range in Figure 1, that is, in the range of SOCu003d[10%, 100%], the battery’s The ohmic resistance changes very little, and in the lower SOC range, the ohmic resistance increases significantly with the decrease of SOC.

It should be noted that the internal resistance of the battery changes very complicatedly and is affected by factors such as temperature, depth of discharge, charge and discharge rate, and cycle times. Different battery cells of the same type are also related to the inconsistency of the battery and the different working environment. Battery open circuit voltage characteristics The OCV-SOC relationship curve of lithium-ion batteries is less affected by temperature, discharge rate, and aging degree. However, there will be a certain difference between the two characteristic curves in the two states of charge and discharge.

The capacity characteristics of the battery can be seen from Figure 3. The voltage curve of the lithium-ion battery during the entire discharge process can be divided into 3 stages:

The terminal voltage of the battery drops rapidly in the initial stage. The greater the discharge rate, the faster the voltage drops; the battery voltage enters a stage of slow changes. This period of time is called the battery plateau area, and the discharge rate is Smaller, the longer the platform area lasts, and the higher the platform voltage, the slower the voltage drop. In the actual use of lithium-ion batteries, it is desirable that the battery work in the platform area as much as possible; when the battery is nearly discharged, the battery load voltage begins to drop sharply until it reaches the discharge cut-off voltage.

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