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Will the different charging methods of the charger affect the battery life?

wallpapers News 2021-06-02
The use of different charging methods for the battery will have varying degrees of impact on the battery life, and the use of an appropriate charging method is of great significance to extending the battery life. What are the common charging methods for car chargers?
Constant voltage charging
During the whole charging process, the charging voltage remains unchanged, and the charging current gradually decreases as the charging time increases. When the charging current is less than a certain value, the charging is stopped. The entire charging process consumes less energy, can effectively avoid battery overcharging, and is simple to control and easy to operate. However, the initial voltage value of the battery to be charged is often small, resulting in a large charging current in the initial stage of charging. On the one hand, excessive current will cause the occurrence of battery polarization and affect the charging speed; on the other hand, the battery temperature will increase rapidly, which is serious. It is easy to burn out the battery and cause accidents. Therefore, at the beginning of charging, the charging current value needs to be limited to keep the battery charged within an acceptable current range.

DC charging
At the beginning, the power battery is charged with a constant current. When it is about to be fully charged, a constant low current is used for floating charge to fully charge the remaining power and compensate for the self-discharge of the battery. When the charging voltage reaches the rated voltage, the charging is stopped. Constant current charging avoids the problem of excessive constant voltage charging current, and the current is always limited within the acceptable range of the battery pack.

Phased charging
According to the actual application, it can be divided into two-stage or three-stage charging. The first stage is constant current charging, and the battery is quickly charged with a large current to make the battery voltage reach a certain voltage value (set the old according to the voltage of the power battery pack; the second stage is constant voltage charging, continue with a current smaller than the constant current Charge the battery to reduce the gas production of the battery; the third stage is float charge, charge the battery with a trickle to ensure that the battery can be fully charged, when the control system detects that the charging current is less than a certain set value, the charging ends. Combination of stage charging In addition, the advantages of constant voltage and constant current charging methods are beneficial to reduce the polarization of the battery and avoid the impact of overcharge and high current charging. At present, most of the charging adopts phased charging.
The charging voltage and current of constant voltage charging, constant current charging and stage charging are continuous, and there is not enough rest time for the battery to eliminate polarization. Polarization can cause the battery to overheat, gas out and other phenomena, and limit the charging speed. In severe cases, battery life will be affected. The pulse charging method and the positive and negative pulse charging method adopt discontinuous charging current, which can effectively reduce or eliminate the occurrence of polarization, speed up the charging speed and delay the service life of the battery.

Pulse charging
Using pulse charging to provide sufficient rest time for the battery, which is conducive to the full reaction of the active substances inside the battery, effectively reducing and eliminating the occurrence of polarization, and can be charged with a larger current without worrying about the battery overheating. It can effectively improve the charging efficiency, shorten the charging time, and delay the battery life.
The positive and negative pulse charging method is an improvement to the pulse charging method. The entire charging process includes positive pulse charging, intermittent rest and negative pulse discharge. The positive pulse charge is performed first, and after a short period of rest, the negative pulse discharge is performed briefly. Short-term negative pulse discharge of the battery can effectively remove the polarization phenomenon, accelerate the electrochemical reaction inside the battery, and reduce the battery temperature. Although part of the electrical energy is lost, the battery can be charged with a higher charging current, which can effectively speed up the charging. Speed ​​and improve charging efficiency, delay battery life.
If you want to learn more about car chargers, you can click on the link:
What is an EV On-board Chargers?
Introduction to the classification of charging systems for electric vehicle on-board chargers

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