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Lithium batteries are divided into power batteries and capacity batteries. Do you know the difference between them?

Lithium batteries are divided into power batteries and capacity batteries. Do you know the difference between them?

Nov 6,2020
Lithium batteries are divided into power batteries and capacity batteries. Do you know the difference between them?
I believe everyone is familiar with lithium batteries. We can see the shadow of lithium batteries in our mobile phones, notebooks, power banks, including new energy electric vehicles that are being implemented! Life and health have always been a key topic of human concern. 
Providing power to pacemakers has also contributed to the development of lithium batteries. Batteries provide a source of power, which is undoubtedly equivalent to the importance of the heart to people for electronic devices. People who have not had a thorough understanding of lithium batteries think that lithium batteries are almost the same, just the difference in size and capacity! 
But in fact, there are really big differences. There are many types of lithium batteries in terms of raw materials. If you want to understand, you can follow me. Search for the type of lithium battery, then what is a power battery? What is a capacity battery?

Capacity battery

Mainly to provide products with longer battery life, with energy density as the main research and development direction of lithium batteries. For example, the consumer electronic devices we use daily, mobile phones, notebooks, power banks, etc., you can find that with the improvement of technology, its endurance is gradually improving, and the volume is also becoming smaller.

Capacity battery-mobile phone battery

Power Battery

It is mainly to provide products with high discharge rate and continuous stable voltage and current, based on battery safety as the basic principle, and improving the reliability of products during operation as the main research and development direction of lithium batteries. For example, our plant protection drone batteries, new energy electric vehicle batteries, etc., with the improvement of technology, its stability and safety are improving year by year.
Power battery-drone battery

The difference
1. The difference in size. Most of the capacity batteries are used in consumer products, generally small in size, such as mobile phones. Power batteries provide power generally larger in size, such as drone batteries.

Second, the difference in discharge, the internal resistance of the capacity battery is large, and the discharge current per unit time is small. The power battery has a small internal resistance because of the high power of the equipment to be driven, and the discharge current per unit time is relatively large. In the battery industry, power batteries use double-stacked bipolar ears in units of monomers, or multi-body units in parallel to increase the current of the entire battery pack. The battery capacity is affected by the current at the output terminal, so parallel The direct effect is to increase the capacity of the power lithium battery pack. The capacity of the battery pack connected in this way tends to have a relatively large capacity, because the internal resistance is larger and the discharge current is small, so the continuous discharge time is longer.

Three, security difference

1. For its own safety, capacity batteries are generally used alone, while power batteries are generally used in groups, which makes the safety design of power batteries more complicated. In terms of simple heat dissipation, capacity batteries can completely dissipate heat by themselves. For groups of power batteries, heat dissipation channels should also be considered when designing heat dissipation.

2. Product safety, the capacity battery provides little protection to the product, most of which are the safety design of the product itself, so the capacity battery itself can only withstand various safety-critical situations based on the material and design of the battery on the basis of higher energy density . The main body of the power battery is generally of higher value, with more design redundancy, and thicker diaphragms, foils and casings are used to ensure the safety of the main body of the product, so the energy density is not as good as the capacity battery, but the power battery has more Many external protection circuits, heat dissipation layouts, etc., of course, also face more severe conditions (higher external voltage, greater current, more complex external environment).

Fourth, consistency, capacity batteries do not need long-term reliability, because most of them are used alone in consumer electronics, so there is not much requirement for consistency, but due to the limited product space, the size of consumer capacity lithium-ion batteries Strict requirements, high capacity, energy density and other requirements. High-end consumer batteries use the most advanced technology and materials, while power batteries require more advanced process control, consistency control and quality management.

Power battery-plant protection smart battery

5. Cycle life. Capacity batteries are generally consumer electronic products. Because of the fast update iterations and the relatively mild discharge environment, the cycle life is not emphasized in the design. It is like finding that the battery is very poor after a mobile phone has been used for a year. Durable, but as technology improves, this phenomenon is gradually improving. The use environment of the power battery is slightly bad, and the product has a long service life, so the cycle life must be considered in the design. Although the cycle life of the power battery is very short in actual use, most of them are 300-500 times, but the mobile phone I have used it for several years and thousands of times with one charge every day. Why is the cycle life of a capacity battery not as good as a power battery? In fact, this comparison is incorrect. Under the same environment, the cycle life of a power battery is much longer than The capacity battery, if the capacity battery is used instead of the power battery, otherwise it may only be used dozens of times.