What is the difference between 18650 lithium power battery and ordinary 18650 lithium battery?

The 18650 power battery supports large current discharge, which may reach 20 times capacity. The 18650 ordinary lithium battery only supports 1 times capacity discharge. That is to say, an ordinary 2600mAh ordinary battery has a maximum discharge current of 2600mA.

The 18650 power battery capacity is generally about twice as small as the normal battery capacity. It is estimated that it will not exceed 2000mAh at most. And it is generally in the 1000mAh ~ 1800mAh.

The operating voltage of a general power battery is lower than that of a normal lithium battery. The charging voltage of the ordinary lithium battery is 4.2V, and the maximum charging voltage of the power lithium battery is about 3.65V. The nominal voltage of a normal lithium battery is 3.7V, and the nominal voltage of a power lithium battery is 3.2V.

1. The positive and negative materials of the 18650 power lithium battery are finer than the ordinary 18650 lithium battery (increasing the surface area and accelerating the chemical reaction rate), and the diaphragm material and the electrolyte used are better.

2, 18650 power lithium battery in the positive and negative poles of the ear are also more than the ordinary 18650 lithium battery (reducing the internal resistance of the ear and satisfying more current).

3, 18650 power battery supports large current discharge, may reach 20 times the capacity of the current, 18650 ordinary lithium battery only supports 1 times the capacity of the discharge.

4, 18650 power battery capacity is generally about twice the capacity of the ordinary 18650 lithium battery.

5. The charging voltage of the ordinary lithium battery is 4.2V, and the maximum charging voltage of the power lithium battery is 3.65V. The nominal voltage of a normal lithium battery is 3.7V, and the nominal voltage of a power lithium battery is 3.2V. A "lithium battery" is a type of battery using a lithium metal or a lithium alloy as a negative electrode material and using a non-aqueous electrolyte solution. Lithium metal batteries were first proposed and studied by Gilbert N. Lewis in 1912. In the 1970s, MS Whittingham proposed and began to study 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 batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium-ion batteries do not contain metallic lithium and are rechargeable. The fifth-generation lithium-metal battery of rechargeable batteries was born in 1996, and its safety, specific capacity, self-discharge rate and performance price ratio are better than lithium-ion batteries. Due to its own high technical requirements, only a few companies in the country are producing such lithium metal batteries.

1. The positive and negative materials of the 18650 power lithium battery are finer than the ordinary 18650 lithium battery (increasing the surface area and accelerating the chemical reaction rate), and the diaphragm material and the electrolyte used are better.

2, 18650 power lithium battery in the positive and negative poles, etc. are also more than the ordinary 18650 lithium battery (reducing the internal resistance of the ear and satisfying more current).

3, 18650 power battery supports large current discharge, may reach 20 times the capacity of the current, 18650 ordinary lithium battery only supports 1 times the capacity of the discharge.

4, 18650 power battery capacity is generally about twice the capacity of the ordinary 18650 lithium battery.

5. The charging voltage of the ordinary lithium battery is 4.2V, and the maximum charging voltage of the power lithium battery is 3.65V. The nominal voltage of a normal lithium battery is 3.7V, and the nominal voltage of a power lithium battery is 3.2V.

A "lithium battery" is a type of battery using a lithium metal or a lithium alloy as a negative electrode material and using a non-aqueous electrolyte solution. Lithium metal batteries were first proposed and studied by Gilbert N. Lewis in 1912. In the 1970s, MS Whittingham proposed and began to study 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 batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium-ion batteries do not contain metallic lithium and are rechargeable. The fifth-generation lithium-metal battery of rechargeable batteries was born in 1996, and its safety, specific capacity, self-discharge rate and performance price ratio are better than lithium-ion batteries. Due to its own high technical requirements, only a few companies in the country are producing such lithium metal batteries.

The 18650 lithium battery is a commonly used lithium battery in electronic products, and is often used as a battery core in the battery of a notebook computer. The definition of the model is: For example, the 18650 type refers to a battery with a diameter of 18 mm and a length of 65 mm.

Lithium cobaltate

The nominal voltage of a single section is generally: 3.7V [1]

The charging voltage is generally: 4.20V-4.3V/4.35V [2]

The minimum discharge termination voltage is generally: 2.75V

Maximum charge termination voltage: 4.20V (Sanyo, Samsung, LG, etc. New large-capacity 18650 charge termination voltage is 4.30v or 4.35V, while Panasonic is still 4.20v)

Diameter: 18±0.2mm

Height: 65±0.2mm

Capacity: 13 years can be achieved up to 3400mAh (Panasonic 3400MAH)

At present, the world's largest manufacturers of this type of lithium battery are Sanyo (acquired by Panasonic), Panasonic, Samsung, Sony and so on.

Lithium iron phosphate

The nominal voltage of a single section is generally: 3.2V

The charging voltage is generally: 3.6V

The minimum discharge termination voltage is generally: 2V

Maximum charge termination voltage: 3.65V

Diameter: 18±0.2mm

Height: 65±0.2mm

Capacity: smaller than the 18650 lithium cobalt oxide, common 1500mah

lithium iron phosphate has the following advantages over lithium cobalt oxide:

1: Safer, overshoot and discharge will not cause explosion or leakage

2: Longer life, more than 1000 cycles of normal use

3: Large magnification, 2C charging 10C discharge, no hot, explosion, leakage, will not affect the life

However, the lithium iron phosphate plate 18650 has a low voltage and is mostly used for electrical appliances with high current operation. The power-type cylindrical lithium-ion battery is mainly 26650, because it has a larger capacity than the 18650.

4: Working temperature: -20 ° C -50 ° C, the best working temperature is 20 ° C -40 ° C, similar to the human body comfortable temperature