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Ni-MH battery used to analyze the repair

In Electronic Infomation Category: N | on April 15,2011

Ni-MH battery because of increased resistance in the end of each charge, the electrolysis of water within the joint and CD4512BE datasheet and several chemical reactions occur so that the internal pressure increased, although most of the gas can be re-synthesis of the water, but in the case of high pressure, there was still a part of the gas through the overflow valve. Over time, internal to a serious water shortage.

Ni-MH battery capacity now are doing great, compact, internal structure, it has a small storage capacity, coupled with rapid charger are now charging a higher internal pressure makes the final, Ni-MH battery will be serious life shortened! some can not even cycle 100 times to hang out.

Therefore, the severe water loss in some way the battery as long as a certain amount of water can restore performance. But the general approach in the water at the same time would undermine the safety valve, making the water a few times after the battery is only available once again abandoned, we must find a way to undermine the safety valve at the same time without water.

Severe dehydration of the Ni-MH battery features: capacity reduction is not serious, but no longer support fast charger charging, fully charged with the slow back-end charge voltage is high, the discharge current is very small indeed, and CD4512BE price and even a few hundred mA short-circuit current slowly discharge it can release a large effective capacity. Two days ago, I was

some classical pottery Sanyo 2700mAh Ni-MH battery waste is a serious case of dehydration, end voltage 1.35V with 7.5A pointer ammeter under the direct short-circuit current is only 1A, disconnect immediately after the voltage recovery These batteries are made of the original group was, therefore, there is still spot traces of the electrode.

Solution is as follows:

1: After the battery completely discharge naked! Situation can be directly under the battery short-circuit or use an ohm voltage when the load close to discharge to 0V, usually takes 5-10 hours. This prevents water after accidentally causing the battery short circuit burned out the battery, and CD4512BE suppliers and can reduce the electrochemical corrosion when soaking in water.

2: Open the valve. Like Sanyo, SONY and other brands of battery cathode at four holes, you can directly see the safety valve rubber cap, with a thin wire (I use iron pin 1 / 4 resistor pin) bent into a U-type, rubber cap from the bottom to the center of the insert of about 2mm. This safety valve forced open, and U-bent in order not to damage rubber cap.

3: open with just boiled water hot battery, wait until the cathode not take bubble, but can not cook the battery!!

Immediately thrown into the cold (room temperature to) clean the water bottle, wait 1 minute, then had inhaled some water, then squeeze the bottle hard cap screw dead about 10 seconds, which have allowed more water to enter Battery:

4: took out the battery, dry, pull out the U-wire, cover the skin. Best to use a large Phillips screwdriver with the hammer, the center of the cathode cap hit slightly concave, in order to increase the degree of safety valve seal, concave down to 0.5mm, smashing more dangerous!

5: for 5 hours after starting 3-5 times repeated charge and discharge. The first charge first with fast charge (I am here to choose the Panasonic BQ390) charge about half an hour, then slow filling (I use the 100mAGP charge Po) charge to voltage 1.45V above (very long), followed by the medium-speed or you can slow charger (I use the SONY the BC-CS2A)

6: re-set the volume. I am here after the first full power for 5 hours, then use "ZB210 Multi-Power Battery capacity tester of" cross-flow discharge to the termination of 1A, then the capacity (accurate to 10mAh, rounded) with a paint pen mark on the battery.

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