How many volts is a Ni-Mh battery?

The size of the voltage by battery specifications of the decision, nickel metal hydride decided to discharge only way.5 and 7 batteries are generally 1.5 V section. Also some of the less commonly used specifications, 9 v, 12 v

Charging voltage and charging current

1 c late charge could reach 1.5 1.6 V

And quality is bad, the end of life of the battery voltage is on the high side

And the charger voltage precision is not enough

consult

Oh!Battery is Sanyo elop, the quality is quite good...But alone to measure the battery voltage is 1.4 v..But according to 1.6 v. A charger.

There are 1 c charging is what mean?

Eneloop batteries are one of the best in the world

Battery separate measurement, measurement when the battery is not charging, the early fully charged battery voltage of 1.4 V is normal.

When charging, batteries voltage higher than not charging, and charging voltage and charging current, charging current, the greater the charging voltage is higher, so the charger is 1.6 V can also be normal, especially large current charging, such as: battery capacity is 800 mah, the charging current is 800 ma, charging is 1 c, then the late charge voltage could reach 1.6 V.

In addition: when charging charging, use multimeter to measure the battery voltage, see if multimeter voltage and the charger voltage consistent?To determine whether the charger voltage value displayed on the high side

Nickel metal hydride battery is a kind of good performance of battery.Nickel metal hydride batteries are divided into high pressure low nickel metal hydride batteries and nickel-metal hydride batteries.Nickel metal hydride battery cathode active material of Ni (OH) 2 (called a NiO electrode), the cathode active material for metal hydride, also known as the hydrogen storage alloy electrodes (called a hydrogen storage electrode), the electrolyte is 6 mol/L potassium hydroxide solution.Nickel metal hydride batteries as an important direction of hydrogen energy application is more and more attention by people.

As fossil fuels in the human development and utilization of massive cases less and less, in recent years, the development and utilization of hydrogen energy is becoming more and more attention.Nickel metal hydride batteries as an important direction of hydrogen energy application is more and more attention by people.Although Ni-Mh batteries is indeed a good battery performance, but the space with nickel metal hydride batteries are the Ni-Mh batteries (hydrogen pressure of 3.92 MPa, 40 kg/cm2), such as high pressure hydrogen storage in the thin wall container used easily, and the Ni-Mh batteries need noble metal catalyst, make it become very expensive, the cost of it is acceptable for civil, therefore, abroad since the 70 s began to explore civil low-voltage Ni-Mh batteries.Nickel metal hydride batteries are divided into high pressure low nickel metal hydride batteries and nickel-metal hydride batteries.High nickel metal hydride batteries are in the early 1970 s by American M.K lein and J.F.S tockel and developed in the first place.Use Ni-Mh batteries instead of cadmium nickel battery and applied to all kinds ofspecial trend has been formed.

Nickel metal hydride battery cathode active material of Ni (OH) 2 (called a NiO electrode), the cathode active material for metal hydride, also known as the hydrogen storage alloy electrodes (called a hydrogen storage electrode), the electrolyte is 6 mol/L potassium hydroxide solution.Active material composition of electrode pole piece craft ways mainly have sintering type, slurry type nickel, nickel foam type, fiber type and embedded infiltration type, such as different process of the preparation of electrode on the capacity, large current discharge performance there is a big difference, generally under conditions of use different battery production process.Communications USES mostly civil battery slurry type cathode and anode of nickel foam constitutes a battery.Charge and discharge chemical reaction [1] as follows:

The positive: Ni (OH) 2 + OH - = NiOOH + H2O + e -

Negative: M + H2O + e = MHab + OH -

The total response: Ni (OH) 2 + M = NiOOH + MH

Note: M: hydrogen alloy;Hab: hydrogen adsorption;The reactive process from left to right as the charging process;The reactive process from right to left for discharge process.

Charging the positive of Ni (OH) 2 and OH - reaction to generate NiOOH and H2O, at the same time release e - generated with MH and OH -, Ni (OH) 2 and M is the total reaction generated NiOOH, hydrogen storage alloy hydrogen storage;Discharging the contrary, MHab release H +, H + and OH - generated H2O and e -, NiOOH, H2O, and e - to regenerate the Ni (OH) 2 and OH -.Battery electromotive force is 1.319 V.

Nickel metal hydride batteries are divided into high pressure low nickel metal hydride batteries and nickel-metal hydride batteries.

Low nickel metal hydride battery has the following characteristics: (1) the battery voltage is 1.2 ~ 1.3 V, and cadmium nickel battery fairly;(2) the high energy density, cadmium nickel battery is more than 1.5 times;(3) can fast charge and discharge, low temperature performance good;(4) can be sealed, resistant to over charge and discharge ability;(5) no generation dendritic crystals, can prevent the short circuit inside the battery;(6) safe and reliable to the environment pollution-free, no memory effect, etc.[1]

High pressure Ni-Mh batteries has the following characteristics: (1) reliability.Good over discharge, over charging protection, resistant to high charge and discharge rate and no dendrite formation.Has a good ratio characteristics.Its quality given to 60 a. h/kg, cadmium nickel battery is five times.(2) the long cycle life, can amount to thousands of times.(3) the whole sealing, less maintenance.(4) the low temperature performance is good, in - 10 ℃, the capacity has no apparent change.[1]

Nickel metal hydride battery maintenance should be paid attention to when use.

(1) avoid use process of charging.Within the cycle life, avoid by all means use process of charging, it is because of charging easy expansion in the positive and negative, causing loss of active matter and the diaphragm is damaged, the conductive network disruption and battery ohm polarization problem such as larger.

(2) to prevent the electrolyte metamorphism.In the Ni-Mh battery cycle life period, should inhibit cell hydrogen evolution.

(3) storage of Ni-Mh batteries.Save the Ni-Mh batteries should be in full, if there is no store electrical energy in the battery case save the battery for a long time, will make the battery cathode weakened the function of hydrogen storage alloys, and leads to a shortened battery life.

(4) after the electricity charge.Nickel metal hydride batteries and nickel-cadmium batteries are the same, there are "memory effect", namely if the discharge of the battery is still on the way electricity using, repeatedly charging battery can't use it soon.

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