Power lithium battery is the power supply for the power source of tools, mostly refers to the battery power supply for electric vehicles, electric trains, electric bicycles, golf carts. It differs significantly from the starting battery used for automobile engine starting. Valve sealed lead-acid battery, open tube lead-acid battery and lithium iron phosphate battery are mostly used.
Battery is a kind of power lithium battery, its purpose is to store the limited electric energy, in the appropriate place to use. It works by converting chemical energy into electrical energy. It uses a lead plate filled with spongy lead as the negative electrode, a lead plate filled with lead dioxide as the positive electrode, and a dilute sulphuric acid of 22 to 28% as the electrolyte. Electrical energy is changed into chemical energy when charged, and chemical energy into electrical energy when discharged. When the battery is discharging, the metal lead is the negative electrode and oxidizes to lead sulfate. Lead dioxide is the positive electrode and is reduced to lead sulfate by a reduction reaction. When a battery is charged with direct current, lead and lead dioxide form at the poles, respectively. After the power is removed, it returns to the state before the discharge to form a chemical battery. Battery is a battery that can be repeatedly charged and discharged, called a secondary battery. It has a voltage of 2V, usually when three batteries are connected in series, the voltage is 6V. In a car, six batteries are connected in series to form a 12 volt battery pack.
Lithium-ion battery is a kind of battery which is made of lithium metal or lithium alloy as anode material and uses non-aqueous electrolyte solution. Because of the chemical characteristics of lithium metal is very active, making the processing, preservation and use of lithium metal, the environmental requirements are very high. Therefore, lithium-ion batteries have not been used for a long time. With the development of microelectronic technology in the 20th century, the miniaturization of equipment is increasing day by day, which puts forward high requirements for power supply. The lithium-ion battery then entered the large-scale practical stage.
Battery according to chemical types, can be divided into lead-acid battery, alkaline battery, nickel cadmium battery, nickel hydride battery, lithium ion battery and so on. Battery can output the discharge current of the size can be divided into power lithium batteries and batteries, the difference of power lithium batteries and batteries basic meaning is: the batteries can be the biggest 3 c discharge current, and power lithium battery is usually refers to 5 c discharge current, and the high ratio power lithium batteries on 20 c or more discharge current.
So, lithium-ion batteries come in both normal and power forms. Power lithium batteries have lead-acid batteries, nickel hydride batteries, lithium ion batteries and so on.
Power lithium-ion batteries should consider more reliability and consistency, after all, they need to be used in long time, bad environment (low temperature in winter, sun exposure in summer, rain and snow), and a large number of batteries in series and parallel. Considering reliability and consistency, let's say a car uses 1000 power lithium batteries. Ideally, the car manufacturer would like to have no problems at the scale of 100,000 vehicles for a model. That is to say, ideally, the probability of power lithium batteries having problems should be less than one in 100 million. For reliability, power batteries are typically designed to be more redundant and use thicker diaphragms, foil, and enclosures, so the energy density is about half that of consumer batteries.
Consumer lithium-ion batteries do not require long-term reliability and are generally not used in groups alone, so they do not have great requirements for consistency. However, as the space of consumer mobile phones and Pads is limited and very precious, consumer lithium-ion batteries have strict requirements on size, capacity and energy density.
About safety, power lithium batteries have more external protection circuit, heat dissipation layout and so on, of course, in the face of 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 lithium batteries require more advanced process control, consistency control and quality management.
1. Different capacity. Generally large mobile phones and other electronic products have small capacity.
2. The cycle life power will also be high.
3. At the temperature control point, the power will have a protective temperature of the battery pack.
What is the difference between power and volumetric lithium-ion batteries?
There are many types of lithium-ion batteries, such as power lithium-ion batteries and capacity lithium-ion batteries. So what are the differences between the two kinds of lithium-ion batteries?
1, the voltage size is different
In the battery industry, when the voltage increases, the corresponding output voltage will also increase, so that the dynamic lithium-ion battery pack can meet the needs of some high-power equipment; And parallel way to directly affect the result, make the whole battery current increases, the capacity is affected by the output current, so the parallel direct purpose is to make the lithium ion battery capacity increase, in this way often connected to the battery capacity is larger, the so-called capacity type lithium ion battery pack.
2. Different application products
Some large equipment to the higher voltage value, because the small power battery pack can not afford to run, so it is necessary to choose power type lithium ion battery pack. For example, the electric bicycle we usually use, the voltage value it requires is often 48V, relative to some cases in our life, 48V is not small. So you have to use a power lithium-ion battery pack to make sure the electric bike runs. However, we usually go to some large supermarkets or shopping malls, some sign lights and standby power supply. Because the power consumption of these devices is not very large, they generally use capacity-type lithium ion battery pack. The two are different in the application of products.
3. Different internal resistance
The internal resistance of the power type lithium ion battery is smaller than that of the capacity type lithium ion battery. Take 18650 as an example, the good manufacturers of 3 rate discharge are generally with PDC, and the internal resistance is about 40; 5 rate discharge is generally not with PDC internal resistance of about 20.
