Introduction to the difference between power battery and capacity battery | Myrtle Thai

Introduction to the difference between power battery and capacity battery

The power battery is the power source that provides the power source for the tool, and mostly refers to the battery that provides power for electric bicycles, golf carts, etc. It is mainly different from the starter battery used to start the car engine. Lithium iron phosphate batteries are mostly used. Lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of microelectronics technology in the 20th century, miniaturized equipment is increasing day by day, which puts forward high requirements on power supply. Lithium batteries have entered a large-scale practical stage. What is the connection between power battery and lithium battery Batteries can be divided into lead-acid batteries, primary alkaline batteries, nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries, etc. according to their chemical types. Batteries can be divided into power batteries and ordinary batteries according to the discharge current that can be output. The difference between power batteries and ordinary batteries is basically defined as: ordinary batteries can be discharged with a maximum current of 3C, while power batteries generally can be discharged with a current of 5C, and Ultra-high rate power batteries can be discharged at a current of 20C or greater.Also read:10kwh lithium battery What is the difference between power batteries and consumer batteries from the perspective of research and development? Power lithium-ion batteries need more consideration of reliability and consistency. After all, they need to be used for a long time (at least 5-10 years), harsh environments (low temperature in winter, sun exposure in summer, rain and snow), and a large number of batteries connected in series and parallel. Considering reliability and consistency, assuming that a car uses 1,000 power batteries, ideally, car manufacturers hope that there will be no problems with a model of 100,000 vehicles, that is, ideally, the probability of power battery failure should be within one Less than one billionth. Considering reliability, power batteries generally have more redundancy in design and use thicker separators, foils and casings, so the energy density is about half that of consumer batteries. Consumer lithium-ion batteries do not need long-term reliability, and generally do not need to be used alone in groups, so there is not much requirement for consistency. However, because consumer mobile phones and pads have limited space and are very precious, consumer lithium-ion batteries have a high demand for size. Strict requirements, high capacity, energy density and other requirements. In terms of safety, power batteries have more external protection circuits, heat dissipation layouts, etc., and of course face harsher conditions (higher external voltage, higher current, more complex external environment), the protection of consumer batteries Less, on the basis of higher energy density, it is necessary to rely on the materials and design of the battery to resist various safety hazards. High-end consumer batteries use the most advanced technology and materials, while power batteries require more advanced process control, consistency control and quality management.
  1. The capacity is different. Generally, the power of large mobile phones and other electronic products has a small capacity.
  2. The cycle life and power will also be higher.
  3. At the temperature control point, the power will have a protection temperature for the battery pack.
What is the difference between a power lithium battery and a capacity lithium battery? There are many types of lithium batteries, such as power lithium batteries and capacity lithium batteries, so what is the difference between these two lithium batteries?Also read:48v 500ah lithium ion battery
  1. The voltage is different
In the battery industry, as the voltage increases, the corresponding output voltage will also increase, so that the power lithium battery pack can meet some high-power equipment; and the direct result of the parallel connection is to make the current of the entire battery pack increase, and the capacity is affected by the current at the output terminal, so the direct effect of parallel connection is to increase the capacity of the lithium battery pack. The capacity of the battery pack connected in this way tends to be relatively large, which is the so-called capacity lithium battery pack. Battery.
  1. The products used are different
Some large-scale equipment requires a higher voltage value, because the low-power battery pack cannot operate, so it is necessary to choose a power lithium battery pack. For example, the electric bicycles we usually use often require a voltage value of 48V. Compared with some situations in our lives, 48V is not small. Therefore, it is necessary to use a power lithium battery pack to ensure the operation of the electric bicycle. And we usually go to some large supermarkets or shopping malls, some sign lights and backup power, because the power consumption of these devices is not very large, so they generally use capacity lithium battery packs, the application of the products is different between the two of.
  1. Different internal resistance
The internal resistance of the power lithium battery is smaller than that of the capacity lithium battery. Taking 18650 as an example, good manufacturers with 3-rate discharge generally have PDC with an internal resistance of about 40; 5-rate discharge generally do not have a PDC with an internal resistance of 20. about.