Lithium Battery Knowledge

There are many reasons for the explosion of 18650 lithium-ion batteries, mainly three.

1. Overcharged

2. Short circuit

3. High temperature

Earlier power banks gave most users a big and heavy impression, but today's power banks are small, especially shared ones. Friends who have used it will feel very light. This is the credit of the polymer lithium-ion battery. In fact, due to the emergence of polymer lithium-ion batteries, many electronic products can perform better, such as TWS Bluetooth headsets and special small electronic devices. Unlike a few years ago, there are fewer and fewer 18650 lithium-ion batteries used in mobile power sources. Is it really eliminated? In addition to volume and weight, what is the difference between polymer lithium ion battery and 18650? This is what we are going to talk about today.

1. Charge in time every day

2. Don't change the charger casually

3. Protect the charger

4. Pay attention to the charging environment

5. Develop some good habits to save electricity

6. Make full use of maintenance conditions

Lithium iron phosphate batteries are used to make lithium-ion secondary batteries. Nowadays, the primary direction is power lithium-ion batteries, which have great advantages compared to NI-H and Ni-Cd batteries.

The general lithium-ion battery is commonly known as "lithium battery", which is currently a battery system with relatively good overall performance. The negative electrode of a lithium-ion battery is a carbon material, such as graphite. The positive electrode is a transition metal oxide containing lithium, such as LiMn2O4.

26650 lithium batteries are mainly used to replace traditional nickel-chromium and nickel-metal hydride batteries in fields such as miner’s lamps, flashlights, power tools, toys, instrumentation, UPS backup power supplies, communication equipment, medical equipment and military lights.

The polymer li-ion battery has many advantages such as high energy density, smaller size, ultra-thin, lightweight, and high safety and low cost. It is a new type of battery. In terms of shape, lithium polymer batteries are characterized by ultra-thinness, and can be made into batteries of any shape and any capacity to meet the needs of various products. The minimum thickness of this type of polymer battery can reach 0.5mm.

Cell refers to a single electrochemical cell containing positive and negative electrodes. A more popular explanation is to remove the battery shell and the protective circuit board, and the rest is called the cell. The quality of the cells directly determines the quality of the rechargeable battery. There are three types of battery cells: aluminum shell battery cells, soft-pack battery cells (also known as "polymer batteries"), and cylindrical battery cells. Generally, mobile phone batteries use aluminum shell battery cells, Bluetooth and other digital products mostly use soft-pack battery cells, and laptop batteries use a series-parallel combination of cylindrical battery cells.

As mobile phones, digital products, notebook computers, drones, model aircraft, power tools, new energy vehicles, portable energy storage, medical equipment and other fields use lithium-ion batteries as power sources, the lithium-ion battery industry has achieved rapid development. As an important part of the production of lithium-ion batteries, the process of lamination and winding has attracted extensive attention from academia and business circles.

The charger of the lithium iron phosphate battery is different from the general lithium ion battery. The highest terminal charging voltage for lithium-ion batteries is 4.2V, and the highest terminal charging voltage for lithium iron phosphate batteries is 3.65V. It is recommended to charge the lithium iron phosphate battery using the CCCV charging method, that is, first constant current and then constant voltage. The recommended constant current is 0.3C. The recommended constant voltage is 3.65V. That is, 0.3C current charging in the constant current process, when the battery voltage reaches 3.65V, use 3.65V voltage constant voltage charging, when the charging current is lower than 0.1C (or 0.05C), stop charging, that is, the battery has overflowed.