Which is better for Li-ion battery soft pack or hard pack? Why do lithium batteries need to be divided into soft and hard packages? Lithium battery is divided into two types of packaging process: soft package and hard package. Soft pack lithium battery and hard pack lithium battery packaging process is different, mainly to meet the need for energy ratio.
Soft pack lithium battery
Soft pack lithium battery is just a liquid lithium-ion battery covered with a polymer shell. In the structure of the aluminum-plastic film packaging, in the event of safety hazards soft pack lithium battery pack will at most bulge crack.
Advantages
1. Soft pack Li-ion battery pack has good safety performance, unlike the steel-cased aluminum-cased battery cell which will explode.
2. Light weight, soft pack battery weight is 40% lighter than the same capacity of steel-case lithium battery, and 20% lighter than aluminum-case battery.
3. High capacity, soft pack lithium battery pack has 10-15% higher capacity than steel case battery of the same size, and 5-10% higher than aluminum case battery.
4. Small internal resistance, the internal resistance of soft pack battery is smaller than that of lithium battery, at present, the minimum internal resistance of domestic soft pack battery cells can be less than 35mΩ, which greatly reduces the self-consumption of battery power.
5. Flexible design, the shape of soft pack lithium battery pack can be customized according to customer's needs, and new cell models can be developed.
Disadvantages
The existing soft pack battery cell models are small and cannot meet the market demand, and the cost of developing new models is high.
Hard pack lithium battery
Hard pack lithium batteries are subdivided into cylindrical and square. The difference with soft pack lithium battery pack is that the external package shell is a metal shell, so the same volume of hard pack lithium battery is much heavier than soft pack lithium battery.
Cylindrical lithium battery pack features
1. The production process of cylindrical lithium battery is mature, with high degree of automatic production and low cost of PACK.
2. Many models, 18650, 21700, 26500, etc. Cylindrical battery form many, suitable for the full layout of electric vehicle space design.
3. Cylindrical battery pack has large heat dissipation area, and generally uses steel or aluminum shell package with relatively low specific energy.
Square lithium battery pack features
1. Aluminum shell square and cylindrical type is also generally aluminum shell, the protection of the cell is better than the soft pack lithium battery.
2. The safety of the cell is also improved compared to cylindrical batteries.
Disadvantages
Consistency is more difficult to guarantee, too many models, the process is difficult to unify, suitable for customized production, not convenient for automated production of battery packs.
Why do lithium batteries need to be divided into soft and hard packs? Which is better?
Li-ion batteries are divided into two main types: soft pack and hard pack, one reason is to meet the specific requirements of different applications for lithium batteries and another reason is for a higher energy ratio.
High energy ratio is an important indicator that all batteries are more pursued, and the light weight of soft pack lithium battery can make the equipment loaded with heavier soft pack lithium battery pack.
If you want to choose a lithium battery pack, for the hard pack and soft pack can not choose, do not know which is better, you can think back to their purchase of lithium battery pack in the end to meet what. According to their own needs, choose a more suitable, which battery pack is better, or depends on the needs.
How to distinguish between soft pack lithium battery and hard pack lithium battery
The difference between soft and hard lithium batteries mainly refers to the material of the lithium battery shell, if there is packaging outside, it is not easy to see, you must see the battery body, the weight of the steel-shell battery will be more than the same volume of the battery focus, but the aluminum shell and soft packaging is not easy to distinguish, but the soft packaging battery will be a little softer than the aluminum-shell battery, it is easy to break by hand deformation.
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