The 21700 battery is the cylindrical battery model, specifically:
21 - refers to the outer diameter of the cylindrical battery is 21mm
700 - refers to the cylindrical battery The height is 70.0 mm.
This is a new model developed to adapt to the requirements of electric vehicles for longer range and to improve the efficient use of vehicle battery space. Using the same material, the 21700 has more than 35% higher capacity than the common 18650 cylindrical lithium battery.
It was first developed by Panasonic for Tesla in the United States. Today, many companies in South Korea and China use this model.
The difference between 21700 and 18650
Yes, the cell capacity of 21700 battery is 3ah to 4ah, which can be combined into one battery 48v10ah lithium battery, which is suitable for 250W, AC motorsable to travel 35 kilometers.
The 48V lithium battery is divided into 13 strings and 14 strings. The advantage of 14 strings is that the full voltage is 58.8V. It can be charged directly with the original 48V lead-acid charger. Full voltage is reached, the green light flashes normally.
Lithium battery specifications, size standards and parameters
The difference between 21700 and 18650 batteries is as follows:
1, Various sizes: 18650 lithium battery, diameter 18MM, length (height) 65MM. Usually they are round. The 21700 lithium battery, with a diameter of 21mm and a length (height) of 70mm, is generally called a lithium ion battery.
2. Different specifications and capacities: 18650 lithium-ion battery has a capacity between 1200 mAh and 3600 mAh, but the most mature technology is generally between 2000 mAh and 3200 mAh, and theCapacity of 21 700 lithium-ion batteries is between 3000mah to 5000mah.
3. Different application fields: 18650 lithium ion battery is suitable for rechargeable battery lighting, processing and manufacturing equipment lithium batteries, rechargeable battery inflatable tools, electric vehicle charger batteries, batteries lithium electric products, 3C digital products, smart home, etc.
Purchase of batteries
1. Choose battery products with “National Inspection-Free” and “Chinese Famous Brand” logos and locally famous brand battery products. Product quality is guaranteed to a certain extent.
2. According to the requirements of electrical appliances, select the applicable battery type and size, and purchase batteries suitable for electrical appliances according to the size and characteristics of electricity consumption.than electrical appliances.
3. Pay attention to the production date and shelf life of the battery, and buy recently produced batteries (new batteries have good performance).
4. Pay attention to the battery logo. The battery brand should indicate the manufacturer name, battery polarity, battery model, rated voltage, brand, etc. ; batteries or 4 batteries heat shrink) shrink, or hang tag and hanging card)There must be factory address, production date and shelf life in Chinese or shelf life expiration date and the number of the implementation standard. When purchasing alkaline zinc-manganese batteries, you should check whether the model has the words ALKALINE or LR. .
5. Since the mercury in batteries is harmful to the environment, in order to protect the environment, you should choose batteries with the mterms “mercury-free”, “0% mercury” and “no added mercury”. on the brand when purchasing.
The specifications and sizes of lithium batteries are: standard 0440 battery, 14500 battery, 16340 battery, 18650 battery, 21700 battery, 26650 battery, etc. The parameters are detailed as follows:
p>1. 10440 Battery: The 10440 battery is a lithium battery with a diameter of 10 mm and a height of 44 mm.
2. 14500 Battery: The 14500 battery is a lithium battery with a diameter of 14mm and a height of 50mm.
3. 16340 Battery: The 16340 battery is a lithium battery with a diameter of 16mm and a height of 34mm.
4. 18650 battery: The 18650 battery is a lithium battery with a diameter of 18 mm and a height of 65 mm.
5. 21700 Battery: The 21700 battery is a lithium battery with a diameter of 21mm and a height of 70mm.
6. 26650 Battery: The 26650 battery is a battlithium battery with a diameter of 26 mm and a height of 65 mm, with a nominal voltage of 3.2 volts and a nominal capacity of 3200 mAh.
7. The capacity of the 18650 lithium-ion battery ranges from 1000 mAh to 3000 mAh, but the technology is generally between 1800 mAh and 2600 mAh. If the capacity of the 18650 lithium-ion battery is too high, the cost will increase significantly. In addition, the 18650 lithium-ion battery with too high capacity in non-special areas is not of great importance.