Main characteristics of lithium ion battery

A. The weight of high energy density lithium ion battery is half of that of nickel cadmium or nickel hydrogen battery with the same capacity, and the volume is 20-30% of nickel cadmium and 35-50% of nickel hydrogen. B. High voltage The working voltage of a single lithium-ion battery is 3.7V (average), which is equivalent to three nickel-cadmium or nickel-hydrogen batteries in series. C. Non-polluting lithium-ion batteries do not contain harmful metal substances such as cadmium, lead and mercury. D. The lithium-ion battery without metal lithium does not contain metal lithium, so it is not subject to the provisions of aircraft transportation on the prohibition of carrying lithium batteries in passenger aircraft. E. High cycle life Under normal conditions, the charge and discharge cycle of lithium ion battery can exceed 500 times, and the lithium ferrous phosphate (hereinafter referred to as ferrophosphate) can reach 1000 times. F. Memory effect without memory effect refers to the phenomenon that the capacity of Ni-Cd battery decreases during the charge-discharge cycle. Lithium ion batteries do not have this effect. G. The constant current and constant voltage charger with rated voltage of 4.2V is used for fast charging, which can make the lithium ion battery fully charged within 1.5-2.5 hours; The newly developed lithium phosphate battery can be fully charged in 35 minutes.

Long-term storage method of disposable lithium battery and rechargeable lithium battery

As lithium batteries are more and more widely used in our lives, how much do you know about the long-term storage methods of disposable lithium batteries and rechargeable lithium batteries? Let whirlpool battery briefly introduce you! 1. Lithium primary battery Also called primary lithium battery. It can discharge continuously or intermittently. Once the power is exhausted, it can not be used again. It is widely used in cameras and other electronic products with low power consumption. The lithium primary battery has low self-discharge and can be stored for 3 years. The effect will be better if it is stored in cold storage. It is a good way to store the lithium primary battery in a low temperature place. Note: Unlike lithium-ion batteries, lithium-ion batteries cannot be recharged. Charging is very dangerous! 2. Lithium ion battery is also called secondary lithium battery. It can be stored for more than half a year at 20 ℃ because of its low self-discharge rate and most of its capacity can be recovered. There is self-discharge phenomenon in lithium batteries. If the battery voltage is kept below 3.6V for a long time, it will lead to battery over-discharge, damage the internal structure of the battery and reduce the battery life. Therefore, lithium batteries stored for a long time should be recharged every 3~6 months, that is, charged to a voltage of 3.8~3.9V (the best storage voltage of lithium batteries is about 3.85V), kept at a discharge depth of 40% - 60%, and should not be fully charged. The battery shall be stored in a dry environment of 4 ℃~35 ℃ or in a moisture-proof package. Keep away from heat sources, and do not place it in direct sunlight. Lithium battery has a wide range of application temperatures. It can still be used outdoors in winter in the north, but its capacity will be much lower. If it returns to room temperature, its capacity can be restored.

Do you know the regulations on carrying lithium batteries in aircraft?

With the pace of people's life getting faster and faster, lithium batteries are widely used in our daily life today. Do you know the rules of carrying lithium batteries by plane? In order to ensure flight safety and avoid unsafe events caused by passengers carrying lithium batteries (lithium metal batteries are easy to ignite when the temperature inside the aircraft is high), in August 2008, the Civil Aviation Administration of China made clear provisions for passengers carrying lithium batteries on board: First, passengers are not allowed to carry lithium batteries in checked baggage. Second, passengers can carry lithium-ion battery cells or consumer electronic devices (watches, calculators, cameras, mobile phones, laptops, camcorders, etc.) for personal use. The backup battery must be individually protected against short circuit and can only be carried in hand luggage. In addition, each spare battery shall not exceed the following quantities: for lithium metal or lithium alloy batteries, the lithium content shall not exceed 2 grams; For lithium-ion batteries, the total lithium content of the same mass shall not exceed 8 grams. Third, passengers can carry lithium-ion batteries with a total lithium content of more than 8g but not more than 25g. If a single battery can be protected from short circuit, it can be carried in hand luggage. Spare batteries are limited to 2 per person. Fourth, other types of standby dry batteries, such as nickel-metal hydride batteries, can also be carried with you if short circuit protection measures are taken. Fifthly, lithium-ion batteries with total lithium content of more than 25 grams of equivalent quality shall be shipped in the form of goods in accordance with the standard of the Specification for Air Transport of Lithium Batteries (MH/T1020-2007).

Danger of long and deep charging of lithium battery

I don't know if you have the habit of charging your electronic products at night and unplugging the charger the next morning. In fact, this habit is wrong for two reasons: First, it is not conducive to the concept of environmental protection and energy conservation; Second, it is also a kind of damage to the battery itself. In order to make our living environment better, and also to worry about our need to replace the batteries of electronic products frequently, please take a moment to see why the batteries, especially lithium batteries, cannot be recharged for a long time. Long charging may lead to overcharge. The 18650 lithium battery, polymer lithium battery and lithium iron phosphate battery charger will automatically stop charging after the battery is fully charged, and there is no so-called "trickle" charging that lasts for more than 10 hours. That is to say, if your lithium battery is fully charged, it will also be white charged if you put it on the charger. However, none of us can guarantee that the characteristics of the charge and discharge protection circuit of the battery will never change and the quality will be guaranteed, so your battery will be at the edge of danger for a long time. This is another reason why we oppose long-term charging. On some machines, if the battery charger is not removed after charging for a certain time, the system will not only stop charging, but also start the discharge-charge cycle. Maybe the manufacturer of this method has its own purpose, but it is obviously detrimental to the battery life. At the same time, long-term charging takes a long time and often needs to be carried out at night. According to the situation of China's power grid, the voltage at night in many places is relatively high and fluctuates greatly. As we have said before, lithium batteries are very delicate. They are much less resistant to fluctuations in charge and discharge than nickel batteries, which brings additional risks. In fact, shallow and shallow charging is more beneficial for lithium batteries. Only when the power module of the product is calibrated for lithium batteries, deep and deep charging is necessary. Therefore, the products powered by lithium battery need not be rigidly bound by the process. All things should be convenient and charged at any time.

Paper batteries that can generate electricity only by bacteria

Use paper as battery? Generating electricity by bacteria? The human imagination is really unpredictable. Wait, this is not a fantasy, because someone has already made it. This kind of foldable paper battery is soft and environmentally friendly. It can generate electricity by itself relying on paper as a sensor. As a source of electricity, bacteria can generate enough energy through metabolism to generate electricity. Any raw material containing bacteria, such as sweat or dirty water, can be used as power generation material. The cost of origami battery is very low, only 5 cents. The folded battery is only the size of a match box. Although the paper battery is small in size, it is enough to provide the power required for a small LED lamp to work. As this technology.

How to choose batteries for two-wheel electric vehicles

With the development of two-wheel electric vehicles in the direction of light weight and long endurance, lithium batteries with lighter weight and higher energy density, along with the rise of application scenarios such as shared trams, take-out and express delivery, have a great trend to catch up with lead-acid batteries. So how to choose the battery for two-wheel electric vehicles, lead acid battery or lithium battery? Next, Brother Shibao will analyze and compare for you.