April 26, 2024

Recognize the memory effect of the battery

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 is that the battery automatically maintains this specific tendency after being subjected to a specific duty cycle for a long time. This is first defined in nickel-cadmium batteries. The nickel-cadmium bag battery has no memory effect, and the sintered battery has a memory effect. Now the nickel metal hydrogen (commonly known as nickel-hydrogen) battery is not bound by this memory effect definition. Because of the improvement of the modern nickel-cadmium battery process, the above The memory effect has been greatly reduced, and another phenomenon has replaced this definition, which is the "lattice" of nickel-based batteries. Usually, nickel-cadmium batteries are affected by these two effects, while nickel-hydrogen batteries only Affected by the "lattice" memory effect, and the effect is smaller than that of nickel-cadmium batteries.
In practical applications, the method of eliminating memory effects has strict specifications and an operational process. Improper operation can be counterproductive.
For nickel-cadmium batteries, the normal maintenance is regular deep discharge: an average of one month (or 30 cycles) for a deep discharge (discharge to 1.0v / per section, foreigners called exercise), the usual use is to use light batteries Or use the shutdown method to ease the formation of memory effect, but this is not exercise, because the instrument (such as mobile phone) will not use 1.0v / every section to shut down, you must have a special equipment or line to complete the work. Fortunately, many NiMH battery chargers have this function. For nickel-cadmium batteries that have not been exercised for a long time, due to the accumulation of memory effects, the capacity recovery cannot be performed with exercise. In this case, a deeper discharge is required (foreigner called recondition) ), this is a process of discharging the battery to 0.4v per section for a long time with a small current, which requires professional equipment. For NiMH batteries, the frequency of the exercise is valid every three months. Relieve the memory effect. Because the cycle life of nickel-metal hydride batteries is much lower than that of nickel-cadmium batteries, almost no recondition is used.
  1. Recommendation: It is not necessary to discharge the battery before each charge, and it is harmful, because the battery life is unnecessarily shortened.
  2. Recommendation: It is not advisable to use a resistor to connect the positive and negative terminals of the battery for discharge. The current cannot be controlled, it is easy to over-discharge to 0v, and even the battery polarity of the series battery pack is reversed.

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