Advantages of pouch batteries for pouch lithium batteries

1.Good safety performance.

The pouch battery is packed with aluminum-plastic film in the structure, and in the event of a potential safety hazard, the pouch battery will only crack at most, unlike the steel-shelled aluminum-shell battery.

2.Lightweight.

Pouch batteries are 40% lighter than steel-shell lithium batteries of the same capacity, and 20% lighter than aluminum-shell batteries.

3.Large capacity.

The capacity of the pouch battery is 10 15% higher than that of the steel shell battery of the same size, and 5 10% higher than that of the aluminum shell battery.

4.The internal resistance is small.

The internal resistance of pouch batteries is smaller than that of lithium batteries, and the minimum internal resistance of domestic pouch battery cells can be less than 35m, which greatly reduces the self-consumption of batteries.

5.Flexible design.

The shape of the pouch cell can be customized according to the customer's needs, and new cell models can be developed.

Although pouch lithium battery is not popular in China, its share in the international market is as high as 70%, the following is about the advantages and disadvantages of pouch lithium battery:

First, the advantages. 1. Good safety performance: the soft-pack lithium battery is packaged with aluminum-plastic film in the structure, and the soft-pack lithium battery will generally bulge up first, or crack from the seal to release energy, and will not have the same risk as the hard-pack lithium battery;

2. Light weight: the weight of the pouch battery is 40% lighter than the steel shell lithium battery of the same capacity, and 20% lighter than the aluminum shell battery;

3. Small internal resistance: the minimum internal resistance of domestic pouch battery cells can be less than 35m, which greatly reduces the self-consumption of the battery;

4. Flexible design: The size and shape of the pouch battery can be designed according to the actual needs, unlike the hard pack battery, which only has round and square options.

Second, the shortcomings. 1. The chain is not perfect: the procurement channels of some raw materials and production equipment of soft-pack lithium batteries are still relatively single, and once there is a problem, it will have a certain impact on the production and operation of battery companies and the supply stability of car companies;

2. High cost: At present, the high-end aluminum-plastic film used in domestic soft-pack lithium batteries still relies on imports, and the cost is very high;

3. Few models: The existing models of soft-pack lithium batteries are very limited, and the cost of developing new models is too high, and the soft-pack lithium batteries can only meet a small part of the market demand at this stage.

Will pouch lithium batteries be **?

As can be seen from the above, the soft-pack lithium battery will not be **, in extreme cases, this kind of battery can release energy from the cracking, and will not be like the hard-pack lithium battery energy accumulation to a certain extent after the risk of occurring.

According to incomplete statistics, more than 30 models are equipped with pouch batteries, of which in 2020 among the 20 best-selling new energy passenger cars in Europe, 15 models are equipped with pouch lithium batteries, so there is no need to worry too much about the safety of the battery.

The so-called pouch electric Qinghong pool is a name for the two types of hard-shell batteries, cylindrical and square, and its internal composition (positive electrode, negative electrode, separator, electrolyte.

There is little difference with prismatic and cylindrical lithium batteries, the biggest difference is that pouch batteries use aluminum-plastic composite film as the shell, and prismatic and cylindrical batteries use metal branches as the shell.

Generally speaking, pouch cells have the following advantages:

1. Good safety: The pouch battery is packaged in aluminum-plastic film in structure, and the pouch will be the battery cell in the event of thermal management loss or puncture.

Provides a cushion space that swells and deforms and eventually catches fire or smokes, but does not**.

2. Light weight and high energy density: the weight of pouch batteries is 40% lighter than that of steel shell batteries of the same capacity, and 20% lighter than aluminum shell batteries, so they usually have higher energy density.

3. Good electrochemical performance and long life: the internal resistance of the pouch battery is small, which can greatly reduce the self-consumption of the battery; In addition, pouch cells have a longer cycle life.

Similarly, pouch cells also have shortcomings, that is, the product consistency is poor, the cost is high, it is prone to leakage and flatulence, and it requires additional shells in the grouping process, and the pack process is highly complex.

Lithium iron phosphate and lithium manganese oxide pouch battery is the third generation of Wusen Xiao power lithium battery developed on the basis of the original steel shell, aluminum shell and molded shell battery, which is favored by users at home and abroad for its lighter, thinner, long cycle life, good safety performance, high energy density, stable discharge platform, excellent power performance, environmental protection and pollution-free.