Understanding battery memory effect

The battery memory effect refers to the reversible failure of the battery, that is, the performance of the battery that can be restored after failure. The memory effect refers to the battery's specific tendency to automatically maintain this specific tendency after being subjected to a specific working cycle for a long time. This earliest meaning is in nickel-cadmium batteries, Nickel-cadmium pouch batteries do not have a memory effect, and sintered batteries have a memory effect. The current nickel-metal-hydrogen (commonly known as nickel-hydrogen) batteries are not restricted by the meaning of this memory effect. Because of the improvement of modern nickel-cadmium battery technology, the above-mentioned The memory effect has been greatly reduced, and another phenomenon has replaced this meaning, which is the crystallization of nickel-based batteries.Usually, nickel-cadmium batteries are affected by the combined effects of these two effects, while nickel-hydrogen batteries are only affected by crystals. The impact of the lattice memory effect, and the impact is smaller than that of nickel-cadmium batteries. In actual use, the method to eliminate the memory effect has strict specifications and an operating procedure. Improper operation will be counterproductive. Regarding nickel-cadmium batteries, normal maintenance is Regular deep discharge: Evenly perform a deep discharge every month (or 30 cycles) of use (discharge to 1.0V/each cell, foreigners call it exercise). Normal use is to try to use photocells or shut down and other means to relieve memory The formation of the effect, but this is not an exercise, because the instrument (such as a mobile phone) will not use 1.0V/each cell to shut down, and special equipment or wiring must be used to complete this work. Fortunately, many Ni-MH battery chargers All of them have this function. Regarding the nickel-cadmium battery that has not been exercised for a long time, due to the accumulation of memory effect, it is impossible to use exercise to restore the capacity. At this time, it will require a deeper discharge (foreigners call recondition), which is a kind of very small use. The process of discharging the battery to 0.4V per cell for a long time requires professional equipment. Regarding the nickel-metal hydride battery, the frequency of exercise is about once every three months to effectively alleviate the memory effect. Because of the nickel-metal hydride battery The cycle life is much lower than that of nickel-cadmium batteries, and the method of recondition is almost not used. ▲Proposal 1: In the past, each charge was unnecessary and harmful to the battery, because the service life of the battery was needlessly shortened.▲ Proposal 2: It is not advisable to use a resistor to connect the positive and negative poles of the battery to discharge. The current cannot be controlled, and it is easy to over-discharge to 0V, and even cause the polarity of the battery in the series battery pack to be reversed. Disclaimer: Articles published on this site The pictures and content are from the Internet. If there is any infringement, please contact to delete the previous article: What are the reasons for the excessive internal resistance of the battery during use?