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What are the reasons for the internal resistance of Panasonic battery?

What are the reasons that affect the internal resistance of Panasonic batteries in use?



1. Temperature: Panasonic batteries are very sensitive to temperature. The high temperature of 102 degrees Fahrenheit has little effect on the internal resistance of batteries (less than 2%). Low temperature has some effect on internal resistance, but the effect of temperature on internal resistance of temperature battery is very weak when the temperature of electrolyte is not lower than 65 degrees Fahrenheit.



2. Charging and discharging: In exactly the same environment, releasing 20% of Panasonic battery power in various ways will only have a very small impact on the internal resistance of the battery. In the actual test, 20% of the battery power is discharged at a lower rate, and the change of the internal resistance of the battery is less than 3%.



3. Vulcanization: Because the negative electrode is not fully charged for a long time, some active materials become irreversible lead sulfide, which increases the resistance of the paste.



4. Drying up: Only VRLA (Valve-regulated Lead-acid Battery) will occur, resulting in complete disconnection of conduction paths from adjacent grids.



When the positive plate of Panasonic battery is charged up to 70%, oxygen begins to occur, and when the negative plate of Panasonic battery reaches 90%, oxygen begins to occur.



In general, the thickness ratio of positive and negative plates of Panasonic batteries is 6:4. According to the change of the mass ratio of positive and negative active materials of Panasonic batteries, when the velvety lead on the negative plates of Panasonic batteries reaches 90%, the lead dioxide on the positive plates of Panasonic batteries approaches 90%. After a little charging, the active materials on the positive and negative plates are redox to 95%, respectively, and Panasonic batteries are connected. Nearly fully charged, so that H2, O2 gas can be reduced.



Lead-calcium alloy is mainly used in the grid of VRLA batteries to increase the overpotential of positive and negative gas evolution (H2 and O2) and to reduce the gas evolution during charging process of Panasonic batteries. Ultrafine glass fibers (or silica gel) are used to absorb and store electrolytes, and at the same time, the oxygen released from the positive pole diffuses to the negative pole.



In this way, once oxygen diffuses to the negative electrode, it is absorbed immediately for the negative electrode of Panasonic battery, thus inhibiting the generation of oxygen on the negative electrode of Panasonic battery, resulting in the elimination of more than 90% of the gas generated during the floating charging process of Panasonic battery (a small amount of gas is discharged through the safety valve of Panasonic battery).



What are the reasons for the internal resistance of Panasonic battery?

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