26650 Lifepo4 Battery Cell and High Drain Lithium Pack
Contents
Introduction To Battery Cell
What is a 26650 battery? 26650 battery refers to a battery with a diameter of 26 mm and a height of 650 mm. A battery like this type such as 18650 battery,26650 battery, 21700 battery,etc. And the 26650 cell is the individual battery.
Types of battery cells
- 1 Cylindrical cell: Suitable for automated manufacturing,has high specific energy and good mechanical stability. this battery design allows for the addition of safety features which is not possible with other specifications. It has long life and low cost, but the packaging density is not ideal. This type is commonly used in portable applications.
- 2 Button Cell: The structure is small and cheap,but if it is charged too fast, it will swell. And it can only be charged in 10 to 16 hours. In the new design, however, the ability to charge quickly is required.
- 3 Pouch Cell: This cell uses a laminate structure in the bag. And it is lighter and most cost-effective, but when exposed to high temperatures its life will be shorted. However,we can extends the life by adding lightweight stacking pressure to preventing delamination. Some designs are considered must be 8-10% expansion of 500 cycles.
- 4 Prismatic Cell: Wrapped in steel or aluminum to maintain stability.Jelly or stacked, the battery saves space.but it needs more manufacturing cost than cylindrical batteries.This cell is normally used in energy storage systems and electric power systems.
Highest capacity 26650
Before we discuss the capacity of 26650 lithium battery, a concept should be popularized：First of all, the capacity of all lithium batteries is determined by their structure and material system. That is, different material systems, the same lithium battery structure has different capacities.The capacity of lithium battery is affected by the characteristics of the material itself, as well as the design and manufacturing conditions.So, How much is the capacity of the 26650 lithium battery? We are discussing from the two popular material systems.
1. Lithium Iron Phosphate material system
3.2V2500mAh this battery is specially designed for large current discharge, support 30C discharge, instant 50C discharge, is the first choice of all kinds of starting power supplies.
3.2 The capacity of V3500mAh this battery is currently the largest battery with the capacity of mass production and supply in the lithium iron phosphate system of 26650 (as of December 31, 2016).
2.Lithium Nickel Manganese Cobalt material system
3.7 V5000mAh this is a mature and consistent product. And the full cycle test life can reach 1500 times in the cycle capacity retention rate of more than 80%.
3.7V5500mAh This is an upgraded version of 5000mAh lithium battery .
On the market, the capacity of ternary INR26650 lithium battery is generally in 5000mAh, Which is the best 26650 battery in 2016. 5500mAh, 6000mAh relatively more, but it belongs to ternary system, this kind of 26650 lithium battery capacity and ternary 18650 lithium battery capacity are increased according to the volume, the energy density can be basically made the same.
Performance analysis of 26650 lithium battery capacity
Cycle life: 2000 times (1C charge / 1C discharge, capacity retention rate ≥ 80%, 100% DOD)
Maximum continuous discharge current: 9.6A
Pulse discharge current: 15A, 5s
Working temperature: Charging: 0°C~55°C; Discharge: -20°C~60°C
Storage temperature: -20 ° C ~ 45 ° C
weight: 86g (about)
Nickel-cobalt-manganese ternary lithium ion 26650 single-section nominal voltage is generally: 3.6V
Nominal capacity: 4500 mAh (capacity range 4500-2650 mAh)
The brands like Samsung 26650 battery and Panasonic 26650 are famous brands of 26650 battery. The highest capacity 26650 is 5000Ah,26650 voltage normally 3.6v.
High Drain Lithium Pack
26650 battery pack is any number of individual 26650 cells arranged in series or parallel to provide the power needed for an electronic device.The most typical type of battery used in a battery pack is lithium ions because of their high power density. Battery packs are used in everything from mobile phones to lawn mowers to cars.
26650 high drain battery is able to discharge more current, without damaging the battery or tripping a protection circuit, than a typical battery. Such batteries are mainly used in devices that need a constant supply of power. On the other hand, low drain batteries are are designed to output low voltage and current at a time. These are used for low power devices. Rechargeable batteries that have a capacity less 600mAh fall under the category of low drain batteries.
Advantages and disadvantages
Advantages of 26650 high drain
- High energy density: The much higher power density offered by high drain 26650 batteries are a distinct advantage. They will help your solar system get more energy.
- Self-discharge: The self discharge rate of high drain 26650 battery is much lower than that of other rechargeable batteries. In the first 4 hoursIt is typically around 5% after being charged but then falls to a figure of around 1 or 2% each month.
- Low maintenance:26650 battery pack doesn’t need periodic discharge , because there is no memory of this type batteries.
- Cell voltage: The voltage of each 26650 cell is higher, requiring less cells in many battery applications.The voltage produced by each 26650 voltage is about 3.6 volts. A single cell is all for smartphones ,this simplifies the power management for it.
- Load characteristics: The load characteristics of a lithium ion battery are quite good. As the last charge is used,they still provide a constant 3.6 volts per cell before falling off .
- No requirement for priming: When some battery receive their first charge,they need to be primed. One advantage of lithium-ion batteries is that it is no requirement for this.
Disadvantages of 26650 high drain
- Protection required: 26650 battery pack is not as robust as some other rechargeable batteries. They cannot being over charged and discharged too far. In addition, they need to maintained the current within safe limits. So they need protection circuitry incorporated to ensure they are kept within their safe operating.
- limits.Ageing: All batteries suffer from ageing,so do 26650 battery pack.But we can help increase their life. When a typical 26650 lithium battery needs to be stored ,it should be partially charged around 40% to 50% and kept in a cool storage area. Under these conditions will help increase the life.
- Cost: The price is a major disadvantage of 26650 battery battery. Their manufacture cost are around 40% higher than other batteries. This is a major factor when customer considering their use form other items.
Charging
1. Avoid high temperature
If the 26650 lithium battery is used in an environment with the temperature is above 35°C, the battery energy will be continuously reduced.That means the battery will not last as long as usual. If you have to charge the device at these temperatures, the damage to the battery will be deadly.
2. Avoid low temperature
If lithium batteries are used at low temperatures, below 4°C, it is also found that the life time of liion 26650 is reduced, and some batteries even cannot be charged at low temperatures.
3. Use frequently
Life consists in movement,so does liion 26650.To get the most use of a 26650 lithium ion battery, you need to use it regularly to keep the electrons in the battery flowing at all times. If lithium battery is not be used frequently, please remember to charge it every month.
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