Analysis of common problems and solutions for nickel-hydrogen batteries

1. Ni-MH battery charging problem: Ni-MH batteries are generally charged at an ambient temperature of 0C to 40C; the ambient temperature of the charging process will affect the charging efficiency of the battery, so charging at 20°C to 30C will achieve the best charging efficiency ; When charging at a temperature lower than 0°C, the gas absorption reaction in the battery will be abnormal, resulting in an increase in the internal pressure of the battery, which will cause the battery exhaust valve to start to release alkaline gas, and eventually cause the battery performance to continue to decline; When charging at a temperature higher than 40°C, the charging efficiency of the Ni-MH battery will decrease, the battery will not be fully charged and will shorten the battery working time, and will cause the battery to leak alkaline; reverse charging of the Ni-MH battery is strictly prohibited! Reverse charging of the Ni-MH battery will cause the internal pressure of the battery to rise sharply, which will cause the Ni-MH battery exhaust valve to start to release the alkaline electrolyte, resulting in a rapid decline in the performance of the Ni-MH battery, and the phenomenon of battery swelling and battery breakage. ; Be wary of overcharging, repeated overcharging will cause the performance of the battery to decrease; (overcharging refers to the continuous charging of the battery that is already overflowing). 2. Ni-MH battery discharge problem: Ni-MH battery discharge should be at an ambient temperature of 0C to 45°C; the size of the discharge current will affect the discharge efficiency of the battery, and the battery discharge efficiency in the range of 0.1CmA to 2CmA will be ideal; When the temperature is lower than 0C and higher than 45℃, the discharge capacity of the battery will decrease, and the decrease of the capacity will cause the performance of the Ni-MH battery to decrease; overdischarge should be guarded, because overdischarge (deep discharge) will damage the characteristics of the battery, so Remember to close the power switch during the discharging process, and at the same time, be wary of the battery being connected to the electrical equipment for a long time, and do not put the battery in the equipment during transportation. 3. Ni-MH battery storage problem: the battery should be stored in a dry, low humidity, no corrosive gas and a temperature between 20℃ and 45℃; when the battery is stored in high humidity, the temperature is lower than -20℃ or higher than 45℃. At a temperature of ℃, the metal parts of the battery will be corroded, and the battery will also cause lye leakage due to the expansion and contraction of the internal organic parts; because long-term storage will accelerate the battery's self-discharge and reduce the reactivity, so the long-term storage temperature should be strict Controlling at 10°C to 30°C is more suitable for long-term storage; when the battery is charged for the first time after long-term storage, the decrease in the internal reaction activity of the battery will cause the battery voltage to be higher and the capacity to decrease; in order to restore the battery to its original capacity, The battery in this case should be repeatedly charged and discharged with small current; when the battery is to be stored for more than one year, it is necessary to ensure that the battery is charged and discharged at least once a year, so as to prevent the battery from leaking alkaline and due to the battery's self-discharge. Battery performance degradation caused by discharging. 4. What will happen if Ni-MH battery packs of different capacities are used together? If different capacity or new and old batteries are mixed together, there may be leakage, zero voltage and other phenomena; this is due to the difference in capacity during the charging process, which causes some batteries to be overcharged during charging, and some batteries are not overflowing, and they have capacity during discharge. The high battery is not fully discharged, while the low capacity battery is over-discharged; in such a vicious circle, the battery is damaged and leaks or low (zero) voltage. 5. What are the possible reasons for the zero voltage or low voltage of Ni-MH batteries? 1) The battery suffers from an external short circuit or overcharge, reverse charge (forced overdischarge); 2) The battery continues to be overcharged by a high rate and high current, causing the battery core to expand and the positive electrode is directly contacted and short-circuited; 3) The battery is short-circuited or slightly short-circuited Such as: the positive and negative plates have burrs penetrating the diaphragm paper and contact short-circuit, the positive and negative plates are improperly placed, causing the pole pieces to contact short-circuit, or the positive plate contacts the steel shell short-circuit, the negative electrode is dropped into the diaphragm paper, and the diaphragm paper itself is defective. The positive tab contacts the negative tab and short-circuits. 6. What impact does Ni-MH battery have on the environment? Almost all batteries nowadays do not contain mercury, but heavy metals are still a necessary part of mercury batteries, rechargeable nickel-cadmium batteries, and lead-acid batteries; if improperly disposed of and in large quantities, these heavy metals will have harmful effects on the environment. 7. What is the possible reason for the protruding bottom of the Ni-MH battery or even leakage? 1) The battery is overcharged, especially the high rate and high current continues to overcharge 2) The battery is forced to overdischarge statement: Some pictures and content of the articles published on this site are from the Internet, if there is any infringement, please contact to delete the previous one: Ni-MH What are the reasons for battery self-discharge