The characteristics and advantages of BYD pouch battery mainly include the following aspects :
Package structure : BYD pouch batteries are packaged in aluminum-plastic film, while hard-pack batteries are packaged in steel or aluminum shell. This packaging structure makes BYD pouch battery weight advantage, compared to the same capacity of the hard-pack battery lighter .
Weight and volume : Due to differences in package structure, pouch batteries are lighter in weight and smaller in size, which makes them more suitable for portable devices .
Shape flexibility : The shape of the soft pack battery can be designed according to actual needs, with higher flexibility. In contrast, hard-pack batteries are more fixed in shape, usually round or square .
Safety : BYD pouch batteries will only bulge or crack at most in extreme cases, and will not be as risky as hard-pack batteries. This exhaust performance makes BYD pouch batteries perform better in terms of safety .
Energy density and electrochemical performance : BYD pouch battery has high energy density, good electrochemical performance, flexible design and high safety .
Production efficiency and cost : Although the design flexibility and safety of the BYD pouch battery is high, its product consistency requirements are higher, the group efficiency is relatively low, and the cost is relatively high .
BYD’s application and development trend in pouch battery technology :
Byd began using soft-coated lithium iron phosphate battery modules in its DMI models, which are essentially cells with secondary sealing technology and are encapsulated in aluminum-plastic films. Byd’s soft-pack batteries are designed to meet the needs of different capacities and sizes, such as 26Ah, 40Ah, 42Ah, 47.7Ah, 65.2Ah and 85.2Ah 3. In addition, BYD is constantly optimizing its battery technology, such as the use of refrigerant direct cooling technology and pulse self-heating technology, to improve the battery’s heat dissipation and heating efficiency .
The advantages of pouch cell：
1. High capacity of pouch cell lithium batteries
We know that the space for new energy vehicles is limited. How to increase the battery capacity within a limited space is a problem that new energy vehicle companies have been seeking to solve. The capacity of pouch cell batteries is 10%-15% higher than that of steel-shell batteries of the same volume, and 5%-10% higher than that of aluminum-shell batteries of the same volume. This means that the use of pouch cell batteries for power batteries of new energy vehicles will obtain higher battery capacity, thereby extending the driving range.
2. pouch cell lithium batteries are lighter
Pouch cell batteries are packaged with aluminum-plastic film, which can be 40% lighter than steel-shell batteries of the same capacity, and 20% lighter than aluminum-shell batteries of the same capacity, so the energy density is higher. Using pouch cell batteries as power batteries for new energy vehicles can effectively reduce the curb weight of the vehicle. Under the condition that other technical conditions remain unchanged, it can directly reduce the energy consumption of the whole new energy vehicle, thereby extending the driving range and reducing wear on various parts of the vehicle.
3. Long service life of pouch cell lithium batteries
Data shows that after 1,000 charging cycles, pouch cell batteries can decay 4%-7% less than aluminum-shell batteries, so they have a longer service life.
4. Good safety performance of pouch cell lithium batteries
Pouch cellk batteries are packaged in aluminum-plastic film. When the battery has thermal runaway, it will not explode like hard-pack batteries. The outer packaging can be easily expanded, and the safety performance is relatively good.
5. Flexible design of soft-pack lithium batteries
Pouch cell batteries can be freely matched with battery packs of different sizes and shapes according to customer requirements. It is relatively simple to develop battery models, and can be customized according to customer market needs to open up the battery cell models in the market.
Conclusion：
BYD’s puoch batteries have significant advantages in package structure, weight, volume, shape flexibility, safety, energy density and electrochemical performance, but there are also certain challenges in terms of production efficiency and cost. As the technology continues to advance, BYD will continue to optimize its pouch battery technology to meet the needs of a wider range of applications.
