The characteristics and differences soft package and hard package lithium battery

Lithium battery profile

"Lithium battery" is a battery using lithium metal or lithium alloy as anode materials, and non-aqueous electrolyte solution. Lithium battery was carried out by GilbertN in 1912. In the 1970 s, M.S.W hitTIngham came out with it and began to study lithium ion batteries. Because lithium ion battery chemical characteristic is very lively, the process, storage and usage of lithium metal have very high demand on the environment. So, the lithium battery has not been applied for a long time. With the development of science and technology, the lithium battery has now become the mainstream.

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.

Lithium ion battery structure

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.

The working principle of the lithium ion battery

The working principle of lithium-ion battery is refers to the principle of charging and discharging.

When charging the battery, the battery has lithium ions generated in the anode, the generated lithium ions through the electrolyte to the negative movement. As a cathode carbon layer structure, it has many pores, arrived in the cathode of lithium ion is embedded into the microporous carbon layer, the embedded lithium ion, the more the higher the charge capacity.

Likewise, when to discharge the battery (i.e., we use the battery process), embedded in the cathode carbon layer of emergence, lithium ions and movement back to the anode. Back to the anode of lithium ion, the more the higher the discharge capacity. We usually mean by battery capacity is the discharge capacity.

It is not hard to see, in the process of charging and discharging lithium ion batteries, lithium ion in the motion state from the positive and negative to the anode. If we compared the image of the lithium ion battery as a rocking chair, rocking chair at both ends of the poles for the battery, and lithium ion as excellent athlete, running to and fro in the ends of the rocking chair. So, the experts gave lithium ion battery rocking-chair batteries a cute name.

Soft package lithium-ion batteries introduce

Soft package liquid lithium battery is set on a layer of polymer lithium-ion batteries.On the structure using aluminum-plastic film packaging, in the event of a safety hazardSoft package battery most will only split cheerily.

Soft package lithium battery parameters

Nominal voltage: 3.7 V

Operating voltage: 2.4 ~ 4.2 V

Nominal capacity: 1250 mah

Sustained current standard discharge: 0.2 C

Sustained current biggest discharge: 0.5 C

Working temperature: charging: 0 ~ 45 ℃

Discharge: - 20 ~ 60 ℃

Product size: 52 mm MAX9.5 * 35 *

Finished product resistance: 150 m or less Ω

Discharge voltage protection 2.5 + / - 0.05 V

Lead models: the marking UL1007 / # 24, line length 55 mm protection parameters: voltage overcharge protection/each string of 4.325 + / - 0.025 V

Flow value: 2 ~ 4 a

The advantages of soft package battery

1. Good safety performance

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

2. Light weight

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

Large capacity is 3.

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

4. Small resistance

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.

5. Design flexible

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

Soft package faults of the battery

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

The development of new type high cost.

The difference between lithium battery soft package and hard package

The main difference of lithium battery soft package and hard package is the shell material of lithium-ion battery. If you have any packing outside, it is difficult to judge. You need to see the battery. Steel battery has heavier weight of the shell than battery with the same volume. Aluminum shell and soft packaging is not easy to distinguish. Soft packaging is softer than aluminum battery, so you can break the battery by hand easily.

The page contains the contents of the machine translation.