The difference between the power battery and the capacity battery of a lithium battery

Date:May 20, 2019

Lithium batteries are believed to be familiar to everyone. Our mobile phones, notebooks, charging treasures, including the new energy electric vehicles that are being implemented, can see the shadow of lithium batteries! Life and health has always been a key topic of human concern. In the early 19th century, in order to power the pacemaker, it also contributed to the development of lithium batteries. The battery provides the power source, which is undoubtedly the heart-to-human importance for electronic devices. The public who did not have a deep understanding of lithium batteries think that lithium batteries are similar, just the difference in size and capacity! But in fact, there is really a big difference. Lithium batteries are divided into many kinds from raw materials. If you want to know about me, search for the type of lithium battery, then what is the power battery? What is a capacity battery?

Capacity battery

It is mainly a lithium battery that provides longer endurance for the product and energy density as the main research and development direction. For example, we use consumer electronic devices, mobile phones, notebooks, charging treasures, etc., which you use every day. You can find that as the technology improves, his battery life is gradually increasing and the volume is changing.

Power Battery

Mainly for the product to provide high discharge rate and continuous stable voltage and current, based on battery safety as the basic principle, improve the reliability of product operation as the main research and development direction of the lithium battery. For example, our plant protection drone battery, new energy electric vehicle battery, etc., with the improvement of technology, its stability and safety are increasing year by year.

the difference

First, the volume difference, the capacity of the battery is mostly used in consumer products, generally small size, such as mobile phones. Power batteries are generally more powerful, such as drone batteries.

Second, the difference in discharge, the capacity of the battery internal resistance is large, the discharge current per unit time is small. Since the power battery has a large power, the internal resistance is small, and the discharge current per unit time is relatively large. In the battery industry, the power battery uses double-layered bipolar ears in units of cells, or the parallel connection of multiple bodies makes the current of the entire battery pack increase. The battery capacity is affected by the current at the output end, so parallel The direct effect is to increase the capacity of the power lithium battery pack. The capacity of the battery pack connected by the capacity battery in this manner tends to be relatively large, and the discharge current is long due to the large internal discharge resistance, so the continuous discharge time is long.

Third, the security difference

1. Self-safety, the capacity battery is generally used alone, and the power battery is generally used in groups, which makes the safety design of the power battery more complicated. In terms of simple heat dissipation, the capacity battery can completely dissipate heat by itself. For groups of power batteries, heat dissipation channels must be considered when designing heat dissipation.

2. Product safety, capacity battery protection is very little, most of them are the safety design of the product itself, so the capacity battery itself only resists various dangerous safety situations based on the material and design of the battery on the basis of higher energy density. . The main body of the power battery has a higher general value and more redundant design. The thicker diaphragm, foil and outer casing are used to ensure the safety of the main body of the product. Therefore, the energy density is not comparable to that of the 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, higher current, more complex external environment).

Fourth, consistency, capacity batteries do not require long-term reliability, because most of them are used separately on consumer electronics, so there is not much consistency on the consistency, but due to limited product space, consumer-capacity lithium-ion batteries for size Strict requirements, capacity, energy density, etc. are very demanding. High-end consumer batteries use state-of-the-art technology and materials, while power batteries require advanced process control, consistency control, and quality management.

Fifth, cycle life, capacity battery is generally consumer electronics, because the update iteration is too fast, and the discharge environment is relatively mild, so the design will not focus on cycle life, like a cell phone used after a year found that the battery is not Durable, but as technology improves, this phenomenon is gradually improving. The use of the power battery is notorious, and the life cycle of the product is very long. Therefore, the cycle life must be considered in the design. Although the cycle life of the power battery is very short, most of them are 300-500 times. In the case of a rush every day, it has been used thousands of times in a few years. Why is the cycle life of a capacity battery not comparable to that of a power battery? In fact, this comparison is not correct. In the same environment, the cycle life of the power battery is much larger than that of the capacity battery. If the battery is replaced by a capacity battery, it may only be used dozens of times under other conditions.

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