Keyword search: battery plant , lithium battery factory , power bank works , lifepo4 battery mill , lithium forklift battery manufacturer

What is pulse charging of lithium-ion battery? What effect does pulse charging have on lithium-ion batteries? The charging time and life of lithium-ion batteries have always been the bottleneck of the application of electric vehicles. The traditional fast charging technology may shorten the cycle life of lithium-ion batteries. The polarization voltage is the external manifestation of the electrochemical reaction effect of the charging current in the battery. Excessive polarization voltage in the charging process will shorten the life of lithium ion batteries. Pulse charging is the optimal charging strategy to reduce the accumulation of polarization voltage. What is pulse charging of lithium-ion battery? What effect does pulse charging have on lithium-ion batteries?

Pulse charging of lithium-ion battery

According to incomplete statistics, pulse charging is divided into negative pulse, positive pulse and positive and negative pulse. Pulse current with adjustable amplitude and duty cycle can be used for pulse charging. Positive pulse charging is shown in the figure below. Charge for a period, put aside for a period, and so on. Adding shelving in the charging process can eliminate ohmic polarization and electrochemical polarization to a certain extent, but its use for concentration polarization elimination is limited. In order to solve this problem, we can use positive and negative pulse mode, add discharge pulse after positive pulse charging, and use discharge pulse and shelving to enhance the use of depolarization.

Pulse charging mainly includes three stages: pre-charging, constant current charging and pulse charging. Compared with conventional charging methods, pulse charging can charge at a large current, and the concentration polarization and ohmic polarization of the battery will be eliminated during the shutdown period, making the next round of charging more smooth, with fast charging speed, small temperature change and small impact on battery life, so it is widely used at present. However, its disadvantages are obvious: a limited current power supply is required, which increases the cost of pulse charging.

Influence of pulse charging on lithium ion battery

Under the high current pulse working mode, lithium-ion battery is more likely to decompose the lithium salt LiPF6 in the electrolyte into LiF. The existence of LiF makes the ion diffusion impedance and charge exchange impedance of the battery increase rapidly, which makes the polarization voltage of the battery rise rapidly when the battery is charged at high current, which exceeds the limit voltage of the lithium-ion battery and makes the battery unable to complete charging.

Because Ni-Cd battery is easy to polarize during conventional charging, conventional constant voltage or constant current charging will cause hydrogen and oxygen gas to continue to appear in the electrolyte, and its oxygen will penetrate into the negative electrode and cadmium plate under internal high pressure to generate CdO, resulting in the reduction of the effective capacity of the plate. Pulse charging generally adopts the method of charging and discharging, that is, charging for 5 seconds and discharging for 1 second. In this way, most of the oxygen in the charging process will be reduced to electrolyte under the discharge pulse. It not only limits the gasification amount of the internal electrolyte, but also gradually recovers or approaches the original capacity of the old battery that has been heavily polarized after 5-10 times of charging and discharging with this charging method. The selection of charging and discharging pulse width should ensure that the electrode plate restores the original crystal structure, thus eliminating the memory effect. After the discharge depolarization measures are adopted, the charging efficiency can be improved and large current fast charging can be allowed.

Correct charging method

Intelligent chargers can provide different charging modes and corresponding algorithms according to the characteristics of each kind of battery to achieve good charging effect. Rechargeable batteries have high performance-price ratio, large discharge current, long life and other characteristics, and are widely used in various communication equipment, instruments and electrical measuring devices. However, different types of batteries, such as nickel-cadmium batteries, nickel-hydrogen batteries and lithium-ion batteries, have different charging characteristics and processes.

Pulse is a type of current, which is different from pure DC. The charging current is a pulsating current; The excellent smart charger first uses constant current to charge the battery, and then uses constant voltage to charge the battery near the end of charging. The charging automatically ends after the battery is fully charged. This charging method can be fuller and beneficial to battery life extension. Pulse charging means that the charging current is pulsating current. Pulse charging can also be made intelligent. Intelligent charging can not only control the charging current, but also provide temperature monitoring for excellent intelligent chargers, so intelligent pulse chargers can not be found, so smart chargers can be directly selected.

The important solution of pulse fast charging is how to quickly reduce the use of polarization and improve the charging efficiency, so as to achieve the purpose of fully charging at a faster speed. The pulse charging method can improve the charging speed without sacrificing the life of lithium-ion batteries. In order to better determine the amplitude and width of the pulse and improve the speed and efficiency, it is necessary to have a good grasp of the polarization characteristics of the lithium-ion battery itself, so as to design a suitable charging strategy.

Lithium ForkLift Batteries ,Ensure Quality

Our lithium battery production line has a complete and scientific quality management system

Ensure the product quality of lithium batteries

Years of experience in producing lithium forklift batteries

Focus on the production of lithium batteries

WE PROMISE TO MAKE EVERY LITHIUM BATTERY WELL

We have a comprehensive explanation of lithium batteries

QUALIFICATION CERTIFICATE

THE QUALITY OF COMPLIANCE PROVIDES GUARANTEE FOR CUSTOMERS

MULTIPLE QUALIFICATION CERTIFICATES TO ENSURE STABLE PRODUCT QUALITY

Providing customers with professional and assured products is the guarantee of our continuous progress.

Applicable brands of our products