What are the charging methods of Panasonic battery?
Panasonic batteries are used in many parts of our life, so do you know what the charging methods of Panasonic batteries are? It is not clear to listen to the introduction of Panasonic battery manufacturers!
1. Steady Current Charging Method
In the process of charging, the charging current always keeps unchanged, which is called stable current charging method, short for constant current charging method or equal current charging method. In the process of charging, because of the gradual increase of the battery voltage and the gradual decrease of the charging current, in order to insist that the charging current does not decrease because of the increase of the battery terminal voltage, it is necessary to gradually increase the power supply voltage in the charging process to insist that the charging current remains unchanged. This requires a higher degree of automation of charging equipment, which is generally crude. The constant current charging equipment can not meet the requirements of constant current charging. Constant current charging method, under the maximum allowable charging current of the battery, the larger the charging current, the shorter the charging time. If we consider it from time to time, it is advantageous to choose this method. However, if the charging current remains unchanged at the later stage of charging, at this time, because most of the current is used in electrolytic water, the electrolyte emits too many bubbles and appears boiling, which not only consumes electric energy, but also makes the active substances on the plate fall a lot, the temperature rise is too high, which makes the plate tortuous, and the capacity drops rapidly and scraps early. Therefore, this charging method is seldom used.
2. Stable Voltage Charging Method
In the process of charging, the charging voltage always remains unchanged, which is called stable voltage charging method, short for constant voltage charging method or equal voltage charging method. Since the constant voltage charging start to the later stage, the power supply voltage always insists on the certainty, so the charging current at the beginning of charging is quite large, greatly exceeding the normal charging current value. However, as the charging proceeds, the voltage at the battery end increases and the charging current decreases. When the terminal voltage of the battery is equal to the charging voltage, the charging current will be reduced to the minimum or even zero. It can be seen that the advantage of constant voltage charging method is that it can avoid the falling of active material and the loss of power caused by excessive charging current at the later stage of charging. However, the disadvantage is that when charging at the beginning, the charging current is too large and the volume change of the active material of the electrode is too fast, which affects the mechanical strength of the active material and causes it to fall. At the later stage of charging, the charging current is too small, so that the active substance in the deep of the plate can not be charged, which constitutes a lack of charging for a long time and affects the life of the battery. Therefore, this charging method is generally only suitable for special occasions where there is no distribution equipment or charging equipment is crude, such as the charging of batteries on automobiles, and the charging of small batteries of type 1 to 5 dry batteries are all based on the equal-voltage charging method. When the battery is charged by constant voltage charging method, the required power supply voltage is about 2.4-2.8V for each acidic battery and 1.6-2.0V for each alkaline battery.
3. Steady Voltage Charging with Fixed Resistance
In order to compensate for the shortcomings of stable voltage charging, a method is selected. In other words, a resistor is connected in series between the charging power supply and the battery, so that the current can be adjusted at the initial stage of charging. But sometimes the maximum charging current is limited, so as the charging process proceeds, the battery voltage gradually rises, but the current almost becomes linear attenuation. Sometimes two resistance values are used, about 2.4V, to change from low resistance to high resistance in order to reduce the outgassing.
4. Stage Equal Current Charging Method
The characteristics of constant current and constant voltage charging method are summarized. Batteries are charged with larger current at the beginning of charging, then smaller current is used after a period of time, and then smaller current is used at the later stage of charging. That is to say, the method of constant current charging with different current in different stages is called stage constant current charging method. Stage constant current charging method can be generally divided into two stages, and can also be divided into several stages. Stage equal current charging method requires short charging time and good charging effect. In the later stage of charging, the charge is changed to a smaller current, which reduces the washing of the active substance on the plate by bubbles and the falling of the active substance. This charging method can prolong the life of the battery, save energy and charge thoroughly, so it is a commonly used charging method at present. In general, the battery is charged at 10 h rate in the first stage and 20 h rate in the second stage. The right and wrong charging time of each stage, the specific requirements and standards of various batteries are different.
5. Floating charging method
Batteries used intermittently or only when AC power is cut off are charged by floating charge. In some special occasions, fixed batteries are generally charged by floating charging method. The advantage of floating charging method is that it can reduce the gas evolution rate of the battery and avoid overcharging. Together, because the battery is parallel to the DC power supply, when the electric equipment is used with high current, the battery instantaneously outputs high current, which is helpful to calm the voltage of the power supply system and use the electric equipment normally. The disadvantage of floating charge method is that the charge of single battery is not balanced and the charge is short of electricity, so it is necessary to charge equally at regular intervals.