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, nickel-metal hydride 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 do experiments or use the battery in a flashlight to change so-called electrical appliances, you can refer to the following method: The first step of the nickel-hydrogen battery repair method: completely discharge the nickel-hydrogen battery after stripping, according to the current status of the battery, let the battery directly short-circuit or When the load is discharged with a resistance of 1 ohm until the terminal voltage is close to 0 volts, it will take about 5-10 hours. This can prevent the battery from being short-circuited and burned out accidentally after adding water, and it can also reduce 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 no longer bubbles, but remember not to boil the battery, but to boil the water and then scald it. Put it in a bottle of cool purified water immediately, and wait for about 1 minute. At this time, part of the water has been inhaled. Immediately twist the cap and squeeze the bottle for about 10 seconds to allow more water to 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 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 too much, dangerous situations may occur. Step 5: After standing for 5 hours, start charging and discharging repeatedly 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: Re-determining the capacity. Here it is to be fully charged and left for 5 hours, then use the ZB210 multi-function battery capacity tester to discharge at 1A cross-current to the end, and then mark the capacity on the Ni-MH battery with a paint pen. How to activate Ni-MH rechargeable batteries? Lithium batteries need to be activated, but this is what lithium battery manufacturers do, not what users do. Ni-MH battery activation is divided into two types: one is the activation of the new battery capacity, and the other is the activation of the old battery to remove 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 the MOS tube on the protection board. The activation of the lithium battery requires the positive and negative of the charger. The poles directly charge the positive and negative poles of the battery. When the voltage rises to the offline voltage of the protection board, the protection board will work normally and charge and discharge normally. 2. The purpose of activating old and new Ni-MH batteries is different. Therefore, the short-circuit test must not be used for activation of new batteries. The capacity of the old Ni-MH battery will decrease after a long time of use. At the same time, the effective output of the capacity is affected by the oxide layer on the internal electrode, which increases the internal resistance of the battery. The decrease in capacity is irreversible, so reducing the internal resistance of the battery is The key to activating the old nickel-metal hydride batteries, otherwise, the old nickel-metal hydride batteries will become increasingly unable to adapt to high-current electrical appliances. 3. The self-discharge of the Ni-MH battery is relatively large, and the power will gradually be lost during the long-term transfer process, which will reduce the battery activity and enter the dormant state. If the complete charge and discharge are not performed several times, the output capacity of the Ni-MH battery is due to the memory effect. It is not up to the nominal capacity. In terms of specific methods, three full charge and discharge cycles are usually performed, and the charge mode is preferably 0.1C. This is because when the battery is not activated and the charge is low, high-current charging will cause damage to the electrodes. 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: Comparison of the difference between lithium iron phosphate batteries and traditional lead-acid batteries