Which battery is better?Cylindrical, square or soft pack?
Namely, cylindrical, square and soft package, there are three important current mainstream packaging methods. Different packaging structures mean different characteristics, each with its own advantages and disadvantages. Judging from the development trend of shopping malls in recent years, the proportion of soft pack batteries is increasing. Experts estimate that the market share of soft pack batteries is expected to exceed 50% in the future.
Cylindrical battery with high product yield: sophisticated production technology.
For example, there are many types of cylindrical pools. 14650、17490、18650、21700、26500， etc. Cylindrical lithium-ion batteries are produced with sophisticated technology, lower PACK cost, battery product yield and battery pack consistency; because the battery pack has a large heat dissipation area, its heat dissipation function is better than square batteries; cylindrical batteries are convenient for multiple shapes Combination, suitable for abundant layout of space planning. However, cylindrical batteries are generally packaged in steel or aluminum shells, which are heavier and have relatively low specific energy. Now there are sophisticated production companies in China, Japan, Korea, and the United States, such as SANYO，SONY，LG， WanXiang A123.
Vehicle companies have put forward higher requirements for power lithium batteries in terms of energy density, manufacturing cost, cycle life, and product additional attributes. Without a huge breakthrough in the field of raw materials, with the further expansion of the market and the continuous improvement of the battery life requirements. Appropriately increasing the volume of cylindrical batteries to obtain more battery capacity has become a direction that can be explored for Guangdong lithium-ion batteries. Now the large-scale production of 21700 batteries has been started, and it is planned to be used on Tesla Model 3. If it is tested on other Tesla models, all the 18650 batteries used before will be replaced. Tesla’s approach may Leading a "21700 Trend" in the international arena
The process is consistent and difficult. Square hard shell battery: too many types.
The internal use of winding or laminated technology, the rectangular hard shell battery shell is mostly aluminum alloy, stainless steel and other materials. The protection effect of the battery cell is better than that of the aluminum-plastic film battery (ie, soft-pack battery). The safety of the battery cell has also been greatly improved compared to the cylindrical battery.
Compared with the steel case, the lithium-ion battery aluminum case is developed on the basis of the steel case. Light weight and safety, as well as the resulting functional advantages, make aluminum shells the mainstream of lithium-ion battery shells. The aluminum shell of lithium-ion battery is still developing in the direction of high hardness and light weight technology, which will provide the market with more superior lithium-ion battery products. Companies that produce square hard-shell batteries include GuoXuan Hi-Tech, Samsung SDI LiShen, CATL and so on.