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What is the difference between an aluminum case lithium battery and a soft pack lithium battery?

Aluminum case lithium battery:

Batteries packed in aluminum cases are sealed with laser sealing technology and fully sealed. The aluminum case technology is very mature, and the material technology, such as the inflation rate, expansion rate and other indicators, is not high.

Lithium battery aluminum case is a battery case made of aluminum alloy material. It is mainly used in square lithium batteries. The reason why lithium batteries are packaged in aluminum cases is that it is lighter and safer than steel cases. Lithium battery aluminum cases are designed with square and rounded corners. The material of the aluminum case is generally aluminum-manganese alloy. The main alloy components it contains are Mn, Cu, Mg, Si, Fe and so on. It plays different roles, such as Cu and Mg to increase strength and hardness, Mn to improve corrosion resistance, Si can enhance the heat treatment effect of magnesium-containing aluminum alloys, and Fe can increase high-temperature strength.

What is the difference between an aluminum case lithium battery and a soft pack lithium battery?

soft pack lithium ion battery


In regions with high consumption levels, such as European and American countries, the use of soft pack lithium battery packs has an advantage. In most developing countries, such as India and the Middle East, aluminum case batteries have obvious advantages. The overlap of application fields is reflected in the market of high-end smartphones with the largest number of applications. For example, the soft-pack lithium battery represented by Apple and the aluminum-case battery represented by Samsung are used as examples. Both of them account for half of the usage. Among them, Samsung mobile phones generally use a large size of 4.8 inches, the average battery capacity is about 2800mAh, while the average battery capacity of Apple mobile phones is about 1800mAh.

There are no technical barriers in the industry, and there are still many technical problems to be solved in soft pack lithium battery packs, especially in the battery cycle expansion index, most cell factories still have not solved this problem. The degree of automation of aluminum case battery manufacturing is higher than that of soft-pack lithium batteries. Therefore, the impact of human factors on product consistency is reduced to a certain extent, and labor costs are saved.

In terms of manufacturing cost, aluminum case lithium battery materials have been completely made in China, while aluminum plastic film materials for soft pack lithium batteries still need to be imported, and aluminum case batteries have lower technical requirements for battery materials than soft pack lithium batteries. Therefore, the overall material cost is about 10% lower than a soft-pack lithium battery at the same capacity. In addition, finished product processing is simple, reliable, and cost-effective.

The mass energy density of the soft case lithium-ion battery is higher than that of the aluminum case battery. For the same volume of battery, the soft pack lithium ion battery is about 10% -20% lighter than the aluminum case battery. On the one hand, mid-to-high-end consumer electronics products are becoming thinner and more portable, which in turn has increased demand for battery energy density and product appearance. Soft-pack lithium-ion batteries have the potential to replace aluminum-case batteries under the condition of gradually maturing technology , The advantages will be further highlighted.

The aluminum case lithium battery uses a laser sealing process, while the soft case lithium ion battery uses a hot-melt process. In terms of hermeticity, the aluminum case battery is superior to the soft case lithium ion battery, which avoids aging and air leakage at the seal; The bursting pressure is much smaller than that of an aluminum case battery, because it is packed with an aluminum-plastic composite film.



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