Soft pack lithium-ion batteries VS large format ones
Soft pack lithium-ion batteries and large format lithium-ion batteries:
Safety: Soft pack lithium-ion batteries use an aluminum-plastic film for packaging. In case of a safety hazard, the battery will generally bulge or crack open at the seal, releasing energy without the risk of explosion that hard pack lithium-ion batteries pose.
Lightweight: Soft pack batteries are 40% lighter than steel-cased batteries of the same capacity and 20% lighter than aluminum-cased batteries.
Low internal resistance: Domestic soft pack batteries can achieve a minimum internal resistance of less than 35mΩ, significantly reducing self-consumption.
Flexible design: Soft pack batteries can be designed to fit specific size and shape requirements, unlike hard pack batteries that only come in circular and square shapes.
Incomplete supply chain: Some of the raw materials and production equipment for soft pack lithium-ion batteries have a single source of procurement. Any issues with suppliers can impact battery production and supply stability for vehicle manufacturers.
High cost: The high-end aluminum-plastic film used in domestic soft pack lithium-ion batteries is still dependent on imports, making them very expensive.
Limited models: The number of available soft pack lithium-ion battery models is limited, and the cost of developing new models is too high. At present, soft pack lithium-ion batteries can only meet a small part of the market demand.
Now let's discuss large format lithium-ion batteries and their advantages:
Low internal resistance and high safety: Large format lithium-ion batteries that replace many small capacity batteries with a single large capacity cell have excellent consistency. The data collected by the battery management system (BMS) is reliable. When a battery in a parallel system short circuits, it will quickly consume the energy in other batteries and cause a fire. Therefore, only large capacity single-cell batteries can avoid this problem.
Fewer connection points, lower failure rate: The fewer the connection points in a high-capacity single-cell lithium-ion battery, the lower the probability of an accident.
Large capacity single-cell lithium-ion batteries have a large capacitance, which can improve the performance of the power management system.