Which is better for lithium-ion battery soft pack and hard pack?
The soft-pack lithium-ion battery is just the liquid lithium-ion battery covered with a polymer shell. The structure adopts aluminum-plastic film packaging, and the soft-packed battery will only vent and crack in the event of a safety hazard.
Advantages of soft pack lithium ion battery
1. Good safety performance
Soft pack batteries, unlike steel shell aluminum shell batteries, will explode.
The weight of the soft pack battery is 40% lighter than the steel shell lithium battery of the same capacity, and 20% lighter than the aluminum shell battery.
3. Large capacity
The capacity of soft-pack batteries is 10-15% higher than that of steel-shell batteries of the same size and 5-10% higher than that of aluminum-shell batteries.
4. Small internal resistance
The internal resistance of soft-pack batteries is lower than that of lithium-ion batteries. At present, the minimum internal resistance of domestic soft-pack battery cells can be less than 35m, which greatly reduces the self-consumption of the battery.
5. Flexible design
The shape of the soft pack battery can be customized according to customer needs, and new battery cell models can be developed.
The characteristics of hard-packed cylindrical lithium-ion batteries: ①The production process of cylindrical lithium-ion batteries is mature, with a high degree of automation and low PACK cost; ②There are many models. 18650, 21700, 26500, etc.; ③Cylindrical battery has various shapes, suitable for full layout of electric vehicle space design; ④Cylindrical battery pack has a large heat dissipation area, and generally adopts steel shell or aluminum shell to package with relatively low specific energy.
Power lithium batteries are divided into soft and hard packs, and the hard packs are subdivided into cylinders and squares. The packaging structure has its own advantages and disadvantages, and the basic intention is to meet the different requirements of the market. In terms of market trends, the proportion of soft pack batteries is getting higher and higher, estimated to exceed 50%.
The soft-packed lithium-ion battery conforms to the basic direction of increasing the specific energy and is an effective measure to break the bottleneck. Automobile manufacturers want power lithium battery packs and don't know about batteries. It is best to communicate with power lithium battery manufacturers. The general direction is to promote soft pack batteries.
The difference between soft pack and hard pack of lithium ion battery
The difference between the soft pack and hard pack of lithium-ion battery mainly refers to the material of the lithium-ion battery pack shell. If there is a packaging outside, it is not easy to see it. The battery body must be seen. The weight of the steel shell battery will be more than the same volume. The key point of the battery, but it is not easy to distinguish between the aluminum shell and the soft package, but the soft package battery will be a little softer than the aluminum shell battery, and it is easy to deform by breaking it by hand.
The soft pack lithium-ion battery is 40% lighter and 20% lighter than the steel-case lithium-ion battery and aluminum-case lithium-ion battery of the same capacity. In terms of weight, soft-pack lithium-ion batteries are much lighter than hard-pack lithium-ion batteries, but the important weight ratio lies in the weight of the two casings.
Compared with the steel shell battery and aluminum shell battery of the same size, the soft-pack lithium-ion battery is 10% to 15% and 5 to 10% higher respectively. Although in terms of capacity, soft-pack lithium-ion batteries do not have much higher capacity than hard-pack lithium-ion batteries, there is also a certain gap between the two. In areas with high capacity requirements, the application of soft-pack lithium-ion batteries is still higher. For hard pack lithium-ion batteries.