Brief description of battery memory effect

The battery memory effect refers to the reversible failure of the battery, that is, the performance that can be restored after the battery fails. The memory effect means that the battery automatically maintains this specific tendency after being subjected to a specific working cycle for a long time. The earliest meaning of this 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 hydride (commonly known as nickel metal hydride) batteries are not restricted by the meaning of this memory effect. Because of the improvement of modern nickel-cadmium battery technology, the above-mentioned memory effect has been greatly reduced, and another phenomenon has replaced this meaning, which is the crystallization of nickel-based batteries. Normally, nickel-cadmium batteries are affected by these two effects. Comprehensive influence, while the nickel-hydrogen battery is only affected by the lattice memory effect, and the impact is smaller than that of the nickel-cadmium battery. In actual use, the method to eliminate the memory effect has strict specifications and an operating procedure. Improper operation can be counterproductive. Regarding nickel-cadmium batteries, the normal maintenance is regular deep discharge: uniform deep discharge every month (or 30 cycles) of use (discharge to 1.0V/each cell, foreigners call it exercise), normal use is to use as much battery as possible Or use shutdown and other means to alleviate the formation of the memory effect, but this is not 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 have this feature. Regarding the nickel-cadmium battery that has not been exercised for a long time, due to the accumulation of memory effect, the capacity cannot be restored by exercise. At this time, a deeper discharge (foreigners called recondition) is required. The process of discharging to 0.4V per cell requires professional equipment. Regarding nickel-metal hydride batteries, the frequency of exercise performed approximately once every three months can effectively alleviate the memory effect. Because the cycle life of nickel-hydrogen batteries is much lower than that of nickel-cadmium batteries, reconditioning is hardly needed. ▲Proposal 1: In the past, each charge used to discharge the battery is unnecessary and harmful, because the service life of the battery is 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 overdischarge to 0V, and even cause the polarity of the battery in the series battery pack to reverse. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the design requirements for electric vehicle power lithium battery packs?