Why is the lithium battery soft inside?

Lithium battery is soft

A "lithium battery" is a type of battery using a lithium metal or a lithium alloy as a negative electrode material and using a nonaqueous electrolyte solution. Lithium metal batteries were first proposed and studied by Gilbert N. Lewis in 1912. In the 1970s, M.S.WhitTIngham proposed and began researching lithium-ion batteries. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal are very demanding on the environment. Therefore, lithium batteries have not been used for a long time. With the development of science and technology, lithium batteries have become the mainstream.

Lithium ion battery is a few years ago the replace product of metallic lithium battery and battery is the main composition of anode, electrolyte, diaphragm, and shell.

The positive - used to hide carbon electrode of lithium ion absorption, discharging, lithium ion, lithium into from the battery anode, reach the lithium ion battery cathode.

Negative - lithium materials selected potential as close as possible to potential can be embedded in the lithium compounds, such as all kinds of carbon materials including natural graphite, synthetic graphite, carbon fiber, mesophase balls such as carbon and metal oxide.

Electrolyte - using LiPF6 ethylene carbonic acid, propylene carbonate fat and low viscosity diethyl carbonate ester alkyl carbonic acid with mixed solvent system.

Diaphragm - the polyene micro porous membrane such as PE, PP or their composite film, especially the PP/PE/PP three-layer diaphragm not only low melting point, and has high resistance to puncture strength, the thermal insurance.

With steel or aluminum shell - material, cover body components have the function of the explosion-proof power outages.

Lithium battery can be roughly divided into two categories: lithium battery and lithium ion batteries. Lithium ion battery does not contain lithium metal state, and can be recharged. The fifth generation of rechargeable battery product lithium battery was born in 1996, its security, specific capacity, self-discharge rate and cost performance is better than that of lithium ion batteries. Because of its high technical requirements limit, now only a few countries in the production of this kind of lithium battery.

The soft-pack lithium battery is simply a liquid lithium-ion battery with a polymer shell. The structure is packaged in aluminum plastic film, and in the case of a safety hazard, the soft pack battery will only burst at most.

Safety performance is good

Soft package of batteries, not like steel shell aluminum shell batteries will be an explosion.

Light weight

Soft package weight is the same capacity of steel shell lithium battery 40% lighter and more Aluminum shell battery20% lighter.

Large capacity

Soft package of battery is the same size of steel battery shell, 10 to 15% more capacity than aluminum battery 5 ~ 10%.

Internal resistance is small

Soft package of battery internal resistance is small lithium-ion batteries, the current domestic soft package can be done in the internal resistance of battery core minimum below 35 m Ω, greatly reduced since the power consumption of the battery.

Flexible design

The shape of the soft package of batteries can be customized according to customer's demand, the development of new batteries models.

Existing soft package battery core model is less, can't meet the demand of market;

The development of new type high cost.

There are two kinds of lithium batteries, lithium batteries and Lithium polymer battery。

Ordinary lithium battery inside is liquid electrolyte, must use the hard shell package, to achieve a stable and secure form.

Lithium polymer battery is a solid electrolyte. Of course, is not very hard (can also do very hard).Can arbitrarily change shape, so as to adapt to different needs.

Soft package lithium-ion battery has the advantages of good safety performance, light weight, large capacity, small internal resistance, design flexible, etc.

If there is a package outside, it is not easy to see what material is the lithium battery. You need to see the battery body. The steel shell battery will weigh a little more than the same volume of the battery, but the aluminum shell and the flexible package are not easy to distinguish, but the flexible packaging battery will be softer than the aluminum shell battery, and it will be easily deformed by hand.

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