Lithium iron phosphate battery refers to a lithium-ion battery whose positive electrode material is lithium iron phosphate. Due to the advantages of lithium iron phosphate battery, such as high safety, long cycle life and low cost, it is now more and more widely used in the fields of power and energy storage. According to the packaging form, there are three main forms of lithium iron phosphate batteries, cylindrical cell, pouch cell and prismatic cell. Among them, the installed capacity of aluminum shell lithium iron phosphate batteries has been increasing in recent years, and it occupies a dominant position among the three batteries. However, many have begun to adopt aluminum-plastic film pouch cell lithium iron phosphate battery technology. For example, BYD has won the first place in 2021 with its blade battery. Battery has been advancing rapidly in the market. Among them, BYD began to use pouch cell lithium iron phosphate battery module (referred to as “small blade”) on DMI hybrid models. Its lithium iron phosphate battery cell is encapsulated with aluminum-plastic film. In this case, what is a pouch cell lithium iron phosphate battery?
1. What is a pouch cell lithium iron phosphate battery?
Pouch cell lithium iron phosphate battery
Pouch cell lithium iron phosphate battery is just a liquid lithium-ion battery with a polymer shell, and is structurally packaged with aluminum-plastic film. In the event of a safety hazard, the pouch cell battery will only bulge and crack at most. Pouch cell lithium iron phosphate battery is also another name for polymer lithium battery.
2. What is the difference between pouch cell lithium iron phosphate battery and cylindrical lithium iron phosphate battery and aluminum shell lithium iron phosphate battery
1. Difference in battery capacity
Compared with steel shell batteries and prismatic cell of the same specifications and sizes, pouch cell lithium iron phosphate batteries are 10% to 15% and 5% to 10% higher, respectively. Although the capacity of pouch cell lithium iron phosphate batteries is not much higher than that of hard-pack lithium iron phosphate batteries, there is a certain gap between the two. For fields with high capacity requirements, the application of pouch cell lithium batteries is still higher than that of hard-pack lithium batteries.
2. Differences in battery shape
Because the internal battery of pouch cell lithium iron phosphate batteries is liquid, its appearance can usually have a variety of shapes. This feature has great advantages over hard-pack lithium iron phosphate batteries in fields with specific requirements for the shape of lithium batteries.
Compared with hard-pack lithium iron phosphate batteries, pouch cell lithium iron phosphate batteries have more or less advantages in weight, capacity, shape, etc., but there are still relatively few core models of pouch cell lithium iron phosphate batteries, and the cost of developing new models is also high, so the market demand that pouch cell lithium iron phosphate batteries can meet is still relatively small, but with the development of the market in recent years, the market demand for pouch cell lithium iron phosphate batteries is increasing, and its application fields are also constantly enriching.
3. Difference in battery weight
Pouch cell lithium iron phosphate batteries are 40% and 20% lighter than steel-shell lithium iron phosphate batteries and aluminum-shell lithium iron phosphate batteries of the same capacity, respectively. In terms of weight, pouch cell lithium iron phosphate batteries are much lighter than hard-pack lithium iron phosphate batteries, but the main weight ratio lies in the weight of the shell of the two.
