March , 2021
The self-discharge reaction of lithium-ion batteries is inevitable, and its existence not only leads to the reduction of the battery's own capacity, but also seriously affects the battery's configuration and cycle life. The self-discharge rate of lithium-ion batteries is generally 2% to 5% per month, which can fully meet the requirements for the use of single batteries.
Ternary lithium ion battery refers to a lithium ion battery that uses three transition metal oxides of nickel, cobalt, and manganese as the positive electrode material. Because it combines the advantages of lithium cobalt oxide, lithium nickel oxide and lithium manganate, it has excellent performance for any of the above single-component cathode materials.
The 18650 type lithium battery is a more commonly used lithium battery in electronic products, and is often used as a cell in the battery pack of a notebook computer. When we use it, we find that sometimes the 18650 lithium battery cannot be charged. Let's analyze the reason below.
The lithium battery protection circuit board is mainly composed of protection IC (overvoltage protection) and MOS tube (overcurrent protection), and is a device used to protect the safety of lithium battery cells. Lithium batteries are widely used by people for their large discharge current, low internal resistance, long life, and no memory effect. Lithium-ion batteries are strictly prohibited from overcharging, overdischarging, and short-circuiting during use, otherwise it will cause the battery to catch fire and explode. Therefore, when using rechargeable lithium batteries, there will be a protective circuit board to protect the safety of the batteries.
18650 is a lithium-ion battery is a standard lithium-ion battery model set by the Japanese SONY company in order to save costs, where 18 represents a diameter of 18mm, 65 represents a length of 65mm, and 0 represents a cylindrical battery. The battery pack assembled by two or more 18650 cells in series or in parallel is collectively called the 18650 battery pack.
As we all know, the high-temperature performance of lithium iron phosphate battery packs is very good, the peak heat can reach 350～500℃, and it can still release 100% capacity at high temperature (60℃). But the low temperature is a bit worse than other battery systems, so how to improve its low temperature performance?
Overcharge refers to the behavior of continuing to charge the battery after it has been fully charged in a certain charging process. Over-discharge means that the battery has discharged the internally stored power, after the voltage reaches a certain value, continuing to discharge will cause over-discharge.
Can lithium battery packs do not need a protection circuit board? Is it necessary for protection circuit board of a lithium iron phosphate battery pack to be useful? What happens if the lithium battery does not have a protection circuit board? Generally, batteries have a protection circuit board, and the use of the protection circuit board is also for battery safety. But different types of battery protection circuit boards have different functions. I heard that lithium iron phosphate battery packs are not afraid of overcharging or over-discharging, so some people think that lithium batteries do not need a protective circuit board. Today we will answer these questions for you.