What are the differences between power and capacity batteries?

Power battery is the power source that provides power for tools. It mostly refers to the battery that provides power for electric cars, electric trains, electric bicycles and golf carts. It is mainly different from the starting battery used for automobile engine starting. More valve mouth sealed lead-acid battery, open tubular lead-acid battery and lithium iron phosphate battery.

As one kind of power battery, lead battery can store limited electric energy and be used in the right place. It works by converting chemical energy into electrical energy. It USES lead plates filled with spongy lead as a negative electrode, lead plates filled with lead dioxide as a positive electrode, and 22 to 28 percent dilute sulfuric acid as an electrolyte. During charging, electrical energy is converted into chemical energy, which is then converted into electrical energy during discharge. When the battery is discharged, the metal lead is the negative electrode, which is oxidized to lead sulfate. Lead dioxide is a positive electrode, which is reduced to lead sulfate. When a battery is charged by direct current, lead and lead dioxide are produced at both poles. After removing the power supply, it reverts to its pre-discharge state and forms a chemical battery. Lead-acid batteries are batteries that can be recharged and discharged repeatedly, called secondary batteries. Its voltage is 2V, usually three lead batteries in series, the voltage is 6V. The car USES six lead batteries in a 12-v battery pack.

Lithium battery is a kind of battery which is made of lithium metal or lithium alloy as negative electrode material and USES non-aqueous electrolyte solution. Due to the very lively chemical properties of lithium metal, the processing, preservation and use of lithium metal have very high requirements for the environment. So lithium batteries have not been used for a long time. With the development of microelectronic technology in the 20th century, more and more miniaturized devices are being used, which requires high power supply. The lithium battery then entered the large-scale practical stage.

What is the connection between power batteries and lithium batteries

Batteries can be divided into lead-acid batteries, primary alkaline batteries, nickel-cadmium batteries, nickel-hydride batteries, lithium ion batteries and so on. Battery can output the discharge current of the size can be divided into power batteries and batteries, basic is defined as the difference of power batteries and batteries, batteries can be the biggest 3 c discharge current, and power battery is usually refers to 5 c discharge current, and high ratio of power battery in 20 c or more discharge current.

So lithium batteries come in both conventional and dynamic versions. Power batteries include lead-acid batteries, nickel-metal hydride batteries, and lithium-ion batteries.

What is the difference between power lithium battery and consumption lithium battery from the perspective of research and development?

Power lithium-ion batteries need to be more reliable and consistent. After all, they need to be used for a long time (at least 5-10 years), in harsh environment (low temperature in winter, insolation in summer, rain and snow), and in series and parallel connection with a large number of batteries. Considering reliability and consistency, suppose that a car USES 1000 power batteries. Ideally, the automobile manufacturer hopes that no problems will occur at the scale of 100,000 cars of a model. In other words, ideally, the probability of problems in power batteries should be less than 1 in 100 million. For reliability, power cells typically have more redundancy, for a thicker foil, foil, and foil foil, so they have about half the energy density of consumer cells.

Consumer lithium-ion batteries do not require long term reliability, and generally do not need to be used alone, so there is no great demand for consistency.

For safety, more external power battery protection circuit, heat dissipation layout and so on, of course also faces more harsh conditions (higher external voltage, the bigger current, more complex external environment), consumer battery less protection, want to be in a higher energy density by battery materials and design on the basis of resistance to live of the security risks.

High-end consumer batteries use the most advanced technology and materials, while power batteries need more advanced process control, consistency control and quality management.

1. The capacity is not the same, the general power of mobile phones and other electronic products of small capacity.

2. Cycle life power will also be higher.

3. At the temperature control point, the power will have a protective temperature of the battery pack.

What is the difference between power lithium battery and capacity lithium battery?

There are many types of lithium battery, such as power lithium battery and capacity lithium battery, so what is the difference between the two kinds of lithium battery?

1. Different voltages

In the battery industry, the voltage increases, the corresponding output voltage will also increase, so that the power type lithium battery can meet some high-power equipment; The direct effect of parallel connection is to increase the current of the entire battery, and the capacity is affected by the current of the output terminal. Therefore, the direct effect of parallel connection is to increase the capacity of the lithium battery. The capacity of the battery connected in this way is often large, which is the so-called capacity lithium battery.

2. Different products

Some large equipment requires a high voltage value, because the small power of the battery pack can not operate, so it is necessary to choose the power type lithium battery pack. For example, we usually use the electric bicycle, it requires the voltage value is often 48V, relative to some of our life, 48V is not small. So it is necessary to use the power type lithium battery pack to ensure the operation of the electric bicycle. However, we usually go to some large supermarkets or shopping malls, some sign lights and backup power supply. Because the power consumption of these devices is not very large, we generally use capacity lithium battery packs, which are different in the application of products.

3. Different internal resistance

The internal resistance of dynamic lithium battery is smaller than that of capacity lithium battery. Take 18650 as an example. 5 times the discharge is generally not PDC internal resistance of 20 or so.

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