Briefly describe the relevant parameters and advantages and disadvantages of soft-pack lithium batteries

As smart phones become the most important mobile internet terminals, more and more new technologies are applied to the smart phone field, which greatly enhances the user's operating experience. The replacement of traditional function phones by smart phones has become the mainstream of the mobile phone market. Compared with ordinary mobile phones, smart phones have higher hardware configurations, more operational functions, and their use frequency is higher than that of traditional mobile phones, Multi-core, large-screen, and thin-sized have become the development trend of smart phones. This means that the power consumption of the smartphone is correspondingly increased, but the space left for the battery is not increased, and the battery capacity is required to be larger and thinner. Thinner, larger and safer polymer batteries are more popular with smartphones. Compared with polymer batteries, there is little difference in performance, but flexible packaging lithium-ion batteries with significant cost advantages have become the first choice, and the market has huge room for development.

Soft pack lithium battery advantages

1. Good safety performance

The soft pack battery does not explode like a steel shell aluminum shell.

2. Light weight

The weight of the soft pack battery is 40% lighter than the equivalent capacity of the steel shell lithium battery, which is 20% lighter than the aluminum shell battery.

3. Large capacity

The soft pack battery has a capacity of 10 to 15% higher than the steel shell battery of the same size, and is 5 to 10% higher than the aluminum shell battery.

4. Small internal resistance

The internal resistance of the soft pack battery is smaller than that of the lithium battery. At present, the internal resistance of the domestic soft pack battery core can be as low as 35 mΩ, which greatly reduces the self-consumption of the battery.

5. Flexible design

The shape of the soft pack battery can be customized according to the customer's needs, and a new battery model can be developed.

Soft pack lithium battery

The existing soft pack battery core models are few and cannot meet the market demand;

Developing new models is costly.

Advantages of carbon coated aluminum foil in lithium battery applications

1. Suppress battery polarization, reduce thermal effects, and improve rate performance;

2. Reduce the internal resistance of the battery and significantly reduce the dynamic internal resistance increase of the cycle;

3. Improve consistency and increase battery cycle life;

4. Improve the adhesion between the active material and the current collector, and reduce the manufacturing cost of the pole piece;

5. Protect the current collector from corrosion by the electrolyte;

6. Improve the processing properties of lithium iron phosphate and lithium titanate materials.

Coating double-sided thickness: A section 4 ~ 6μm, B section 2 ~ 3μm.

Conductive coating

Surface treatment of battery conductive substrates with functional coatings is a breakthrough technological innovation. Carbon-coated aluminum foil/copper foil is a uniform and fine coating of aluminum nano-conductive graphite and carbon coated particles on the copper foil. It provides excellent static conductivity and collects micro-current of active material, which can greatly reduce the contact resistance between the positive/negative electrode material and the current collector, and improve the adhesion between the two, reducing the bonding. The amount of agent used, in turn, results in a significant increase in the overall performance of the battery. The coating is water-based (aqueous agent system) and oily (organic solvent system).

Performance advantage

Performance advantages of carbon coated aluminum foil / copper foil

1. Significantly improve battery pack consistency and significantly reduce battery composition. Such as:

Significantly reduce the dynamic internal resistance increase of the battery core;

Improve the consistency of the differential pressure of the battery pack;

Extend battery life;

Significantly reduce the battery composition.

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