Notes 1. Storage of lithium-ion batteries
Lithium-ion batteries can be stored in a clean, dry and ventilated place with an ambient temperature of -5°C to 35°C and a relative humidity not exceeding 75%. Indoors, avoid contact with corrosive substances and keep away from fire and heat sources. The battery power remains between 30 and 50% of the nominal capacity. It is recommended to recharge stored batteries every 6 months.
Note 2. Charging lithium-ion batteries
To charge lithium-ion batteries, a dedicated lithium-ion battery charger must be used.
Lithium ion battery charging adopts CC/CV (constant current + constant voltage) method, which means it is first charged with constant current and then switches to charging at constant voltage when the voltage reaches 4.2. V*n. Charging stops when the current decreases to 0.01C.
Noteue 3: Storing lithium-ion batteries once they are fully charged can reduce capacity loss.
This idea is completely false. Lithium-ion batteries are different from nickel-chromium and nickel- batteries. metal hydride batteries, because they have a very poor "aging" characteristic, that is, after being stored for a while, even if they are not recycled, part of their capacity will definitely be lost. The reason is that the positive. and the negative electrode materials of the battery have been degraded since the beginning of its depletion process. The rate of “aging” is also different at different temperatures and power states.
Storage temperature and power status
Storage after 40% saturation and storage after 100% saturation
98% left at 0 oC (one year later) 94% remaining (one year later) Laterd)
25°C will leave 96% (one year later) will leave 80% (one year later)
40°C will leave 85% (one year later) will leave 65% (one year later)
60oC remaining 75% (after one year) remaining 60% (after 3 months)
Lithium Polymer BatteryComparison Lithium batteries are good, but the difference lies in different raw materials, different safety, different manufacturing processes and different capacities.
1. Raw materials
This is the main reason why lithium polymer batteries work differently from lithium batteries. Polymer batteries refer to the use of polymer materials in at least one of the three main components of the positive electrode, negative electrode or electrolyte.
In addition to the inorganic compounds of lithium batteries, the cathode materials of polymer batteries can also be usedr conductive polymers. Lithium batteries use electrolytes (liquid or colloids)
2. >
Polymer batteries can be thin, in any area and in any shape, because the electrolyte can be solid or colloidal rather than liquid. Lithium batteries use electrolytes and require a solid casing. The housing serves as a secondary packaging to contain the electrolyte.
3. In terms of safety
Polymer batteries are mostly soft batteries, which use aluminum-plastic film as the outer casing when organic electrolytes are used inside, even if the film is aluminum . The liquid is very hot, it will not explode.
4. Cell Voltage
Since polymer batteries use polymer materials, they can be made into multi-layer combinations in cells to achieve high voltages. The capacityThe nominal rating of lithium battery cells is 3.6V. If you want to achieve high voltage in real-world applications, multiple cells should be connected in series to form an ideal high-voltage working platform.
5. Conductivity
The solid electrolyte of polymer batteries has low ionic conductivity. At present, some additives are mainly added to make it gel electrolyte to improve the conductivity. This only increases the ionic conductivity, unlike the conductivity of lithium batteries which maintains a stable value and is not affected by the quality of auxiliary materials.
6. Capacity
The capacity of polymer batteries has not been improved effectively and has been reduced compared to standard capacity lithium batteries.
7. Manufacturing process
The thinner the polymer battery is, the better it can be produced, and the more the batteryThe thicker the lithium, the better it can be produced. expand into more application areas.
8. Price
This is the key factor that determines the market capacity of both. At present, the price of polymer batteries on the market is generally higher than that of lithium batteries. , which affects the market capacity of the two, the ratio of the former to the latter is 1:9.
Remarks
Storage requirements: In an environment with a temperature of 20 ± 5 ℃ and humidity not exceeding 50%, corrosion of the aluminum foil by the Air and water vapor should be avoided during transportation.
This product is divided into two types, A and B. The main characteristics of each are: the appearance of type A is black, the conventional coating thickness is 4-8μm on both sides and the conductive performance is more remarkable; the appearance of type B is light gray and the coating thickness is suitabletional is 2 to 3 μm on both sides. Fewer welding layers can be done in the cladding area and the cladding machine can identify skip gaps.
Type B (gray) carbon coated aluminum sheet can be ultrasonic welded directly in the coating area. It is only suitable for soldering laminated battery tabs (up to 2-3 layers of pole pieces), but the power and time of ultrasound require fine tuning.
The heat dissipation of carbon layer is worse than that of aluminum foil, so the belt speed and baking temperature should be adjusted appropriately when coating.
This product can significantly improve the overall performance of lithium batteries and capacitors, but it cannot be used as the main factor to change some aspects of battery performance, such asnsity of battery, performance at high and low temperature, high voltage, etc.
Reference for the above content: Baidu Encyclopedia-Battery Cell
Reference for the above content: Baidu Encyclopedia-Lithium Battery