Can Ni-MH batteries be repaired? What are the important repair and activation methods for Ni-MH batteries?

Can NiMH batteries be repaired? In principle, Ni-MH batteries cannot be repaired. Many methods on the Internet are a kind of damage to the battery, and it is easy to cause electrolyte leakage and damage the electrical appliances. And it is impossible to restore the original capacity. Jianyi buys new batteries. However, if you want to make a trial or use the battery in a flashlight to replace the so-called electrical appliances, you can refer to the following tips: Ni-MH battery repair essentials The first step: completely discharge the Ni-MH battery after stripping, according to the battery's current condition, the battery is directly short-circuited It is possible to use a 1 ohm resistor when the load is discharged until the terminal voltage is close to 0 volts, which takes 5-10 hours. This can prevent the battery from being short-circuited and burned out accidentally after adding water, and it can eliminate the electrochemical corrosion when immersed in water. Step 2: Open the safety valve. There are four holes in the positive electrode of the battery of Sanyo, SONY and other brands. You can see the rubber cap of the safety valve. Use a thin iron wire to bend into a U-shape, and then insert about 2 mm from the bottom of the rubber cap to the center. In this way, the safety valve is forced to open, and it is bent into a U-shape in order not to damage the rubber cap. Step 3: Use freshly boiled water to scald the nickel-metal hydride battery until the positive electrode stops bubbling, but remember not to boil the battery, but to boil the water and then scald it. Put it in the bottle of cool purified water immediately, maybe expect 1 minute, when the department water has been inhaled, immediately twist the bottle cap and squeeze the bottle for about 10 seconds to make more water enter the battery. Step 4: Take out the Ni-MH battery, wipe it dry, pull out the U-shaped iron wire, and cover it. It is best to use a large Phillips screwdriver and a small hammer to dent the center position of the positive electrode cap slightly to increase the sealing degree of the safety valve. It is enough to dent 0.5 mm. If you smash it too much, a dangerous environment will be generated. Step 5: Arrange for 5 hours in the future to start charging and discharging repeated 3-5 times. For the first charge, use fast charge for about half an hour, then use slow charge to charge the terminal voltage above 1.45V, and then use a medium-speed or slow-speed charger. Part 6: Determine the capacity from scratch. Here is to arrange for 5 hours after the battery is fully charged, and then recycle the ZB210 multi-result battery capacity tester and place it horizontally at 1A until the end, and then mark the capacity on the Ni-MH battery with a paint pen. How to activate Ni-MH rechargeable batteries? Lithium-ion batteries need to be activated, but this is what lithium-ion battery manufacturers do, not what users do. There are two types of Ni-MH battery activation: one is the activation of the new battery capacity, and the other is the activation of the old battery by removing the internal resistance. 1. High voltage cannot be used to activate the Ni-MH rechargeable battery, because the protection voltage of its protection board has upper and lower limits. High voltage will burn out the mos tube on the protection board. The activation of the lithium ion battery requires the positive of the charger. The negative electrode directly charges the positive and negative electrodes of the battery. When the voltage rises to the offline voltage of the protective plate, the protective plate will work normally and charge and discharge normally. 2. The goal of activating old and new Ni-MH batteries is not communicated. Therefore, short-circuit attempts must not be used to activate new batteries. The capacity of the old nickel-hydrogen battery will decrease after being used for a long time. At the same time, the internal electrode that affects the effective output of the capacity still has an oxide layer which increases the internal resistance of the battery. The decrease in capacity is irreversible, so the internal resistance of the battery is eliminated. It is the key to activating the old Ni-MH battery, otherwise, the old Ni-MH battery will become more and more unable to adapt to high-current electrical appliances. 3. The self-discharge of the Ni-MH battery is relatively large, and the power will be gradually lost during the permanent transfer process, so that the battery activity will be low and enter the dormant state. If the complete charge and discharge are not performed repeatedly, the output will be caused by the image effect of the Ni-MH battery. The capacity is not up to the nominal capacity. In detail, it is usually performed 3 full charge and discharge times. Among them, the charging mode is preferably 0.1C. This is because the high current charging will cause damage to the electrodes in an environment where the battery is not activated and the charge is low. 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 post: Different contests between lithium iron phosphate batteries and traditional lead-acid batteries