+86 18988945661 
contact@iflowpower.com 
+86 18988945661
Language
+86 18988945661 contact@iflowpower.com +86 18988945661
Author ：Iflowpower – Portable Power Station Supplier
When the new rechargeable battery is combined into a series block, it is generally charged according to the current of the conventional capacity 0.1c, and then put it several times. However, in fact, no matter how advanced automatic charger is adopted, there will be an abnormal phenomenon in individual batteries after a period of time, that is, individual battery voltage in the battery pack will become very low (close to zero volts), and even battery Phenomenon of voltage polarity inversion.
Over time, this battery will inevitably invalid, and finally cause other batteries in the battery pack to damage the above phenomenon. The reason is that it is important that the internal resistance of these batteries is inconsistent, and there will be varying degrees of excessive overcharge during use, which makes a battery that increases in internal resistance first damage. The figure below shows the normal discharge process (that is, the battery block is substantially consistent and much lower than the load resistance), and the battery pack is made of four batteries from A, B, C, and D.
The discharge current direction is as shown in the figure. During the discharge process, it is assumed that the B battery internal resistance increases, even exceeds the load resistor R, and the phenomenon shown in the figure, that is, A, D, and C three batteries to the B battery, time a long time. The polarity of the B battery will be reversed and damaged.
When the author performs measurement of the battery shown in Fig. 1, the author is discovered that the voltage of each single battery is mostly inconsistent during the discharge process, and there will always be a battery that is first accelerated, and finally from zero Negative value (ie, reversing). If you exchange a new battery, due to the internal resistance, it will exacerbate the repetition of the above phenomenon, bringing our endless trouble during use.
The combination of rechargeable batteries summarizes a point of relevant experience, for the videos of electronic enthusiasts. 1. When using a combined battery, you should often detect the voltage of a single battery.
If you find that the low-low battery should be removed in time, processed separately. 2. Monitor the voltage of each battery at any time when charging is discharged.
3. In the battery pack, the best all the best is handled separately: (1) Separate discharge: use 1.5V electron or 5 ~ 20Ω variable resistance to discharge load, and pause the voltage is 0.
9 ~ 1Y, most The battery will return to about 1.2V after stopping the discharge, to repeat multiple times, until the use of the multimeter 500mA gear the short circuit current, good quality or discharge, insults, the needle, in a certain location (such as 200 ~ 500mA) ) Don't move for a long time, and the poor quality or discharging is quickly dropped to tens of milliamps to zero. Generally, when the pointer faster to tens of millimeters, the battery is substantially put, and it can be stopped.
(2) Separate charging: Battery with large internal resistance differences can not be combined in series to charge, to perform a single independence, such as barely combined charging, neither each battery is sufficient, more dangerous, there will be individual internal resistance batteries It will be damaged by overcharging or refrigeration. As shown in the figure above, we still have the B battery internal resistance Tb, and since the series circuit current is equal, it is obvious that the voltage drop of TB is higher than other batteries, so the power consumed on TB is also large, and the internal resistance is relatively large. The larger the power consumption, the B battery will be damaged by the first, and other batteries are not necessarily full.
In order to charge the quality and internal resistance of the battery, the author designed a simple charging circuit, if you want to figure out. Because the battery has been released, so as long as it is pressed by 0.LC current for 10 hours.
In the above figure, RL, RN is 5 Ω, 20 Ω / 1W, respectively, the RM is a variable resistance of 5 Ω ~ 20 μlw; VDF is a light emitting diode, which can be used to indicate the charging condition, and the VD is a proversion diode, preventing the battery. Adjusting the RM can control current between 30 to 1000, generally 5 batteries can be adjusted to 50 to 70 mA. When the trickle is charged, it can be adjusted to 20 mA or less, and the above adjustment range is not changed, and the RL in Fig.
4 can be appropriately changed. Value or SV supply voltage value. 4.
After charging, the single battery voltage is typically 1.35 ~ 1.45V.
After placing, it is stable at 1.25 to 1.3V.
After a slight discharge, it should be 1.25V for a long time. Just completely charged a single battery with a multimeter (5a) Test a short circuit current, the quality can be stable in 3 ~ 5A (refer to battery), and the pointer is minutes from the number of minutes, the quality is not stable at 2A, if you have a lot of batteries, Choose a battery that is more close to a combination of batteries.
5. Regarding the nickel-cadmium battery, it is generally not discharged directly without the discharge, but considering that the charging capacity is not good, it is best to charge the remaining electric charge.
Copyright © 2023 iFlowpower - Guangzhou Quanqiuhui Network Technique Co., Ltd.
