What are the advantages and disadvantages of lithium ion BMS power batteries?


lithium ion BMS power battery is a new type of high energy battery developed successfully in the 20th century. The negative electrode of the battery is graphite, and the positive electrode is lithium iron phosphate, lithium cobalt, lithium titanate and so on. It was put into practice in the 1970s. Because of its high energy, high battery voltage, wide operating temperature range, long storage life and other advantages, it has been widely used in military and civilian small electrical appliances. So lithium ion BMS power battery as a new favorite battery industry, what are the advantages and disadvantages?

Advantages of lithium ion BMS batteries

1. High energy density, its volume energy density and mass energy density can reach 450W.h/dm3 and 150W.h/kg respectively, and it is still improving.

2. The average output voltage is high (about 3.6V), 3 times that of Ni-Cd and Ni-l batteries.

3. Large output power.

4, small self-discharge, less than 10% per month, less than half of Ni-Cd, Ni-Ml.

5, no Ni-Cd, Ni-MH battery has the same memory effect, excellent cycle performance.

6, can be fast charging and discharging, 1C charging capacity can reach the standard of more than 80% of the capacity.

7. High charging efficiency, basically 100% after the first cycle.

8. Wide operating temperature range, -30~+45℃, with the improvement of electrolyte and positive electrode, it is expected to be expanded to -40~+70℃, low temperature may be extended to -60℃.

9. No maintenance required.

10, more friendly to the environment, known as green battery.

11, long service life, 100%DOD charging and discharging can reach more than 900 times; When using shallow depth (30%DOD) charge and discharge, the number of cycles has exceeded 5000.

lithium ion BMS battery shortcomings

1, the cost is high, the important is the high price of positive electrode material LiC002, with the continuous development of positive electrode technology, can use LiMn204, LiFeP04 and other positive electrode, which is expected to greatly reduce the cost of lithium ion BMS battery;

2, there must be a special protection circuit to prevent overcharge or overrelease;

3, poor compatibility with ordinary batteries, because generally in the use of 3 ordinary batteries (3.6V) can be replaced with lithium ion BMS batteries.

Lithium-ion power batteries partially replace traditional batteries in mobile phones, portable computers, camcorders, cameras, etc. High-capacity lithium-ion batteries, already being trialled in electric vehicles, will be one of the main power sources for electric vehicles in the 21st century and are already used in satellites, aerospace and energy storage.