Ni-MH battery
1. What are the classifications of batteries?
There are many types of batteries, but they are all used for energy conversion.
Therefore, a battery can be defined as a device that converts energy generated in physical or chemical changes into electrical energy.
Those devices that use chemical changes are called chemical batteries. , A device that utilizes changes in physical energy is called a physical battery.
Chemical batteries can be further classified into: (i) primary batteries and fuel cells, which cannot be used once the active material is depleted;
(ii) secondary batteries, which convert external electrical energy into chemical energy when charged, and convert chemical energy when discharged.
Can be converted into electrical energy, using acid as the electrolyte is often called acidic batteries such as lead-acid batteries, while those that use alkali as the electrolyte are called alkaline batteries such as nickel-cadmium batteries and nickel-hydrogen batteries
2. Specifically, what aspects are the advantages of nickel-hydrogen batteries mainly reflected in?
1. The working voltage is the same as that of nickel-cadmium batteries (1.2 volts), so it can replace nickel-cadmium batteries in many applications.
2. The capacity is about one and a half to two times that of the same type of nickel-cadmium battery.
3. Fast charging takes about one hour (requires a special battery charger).
4. Small internal resistance, stable working voltage, and high current discharge capability.
5. It can carry out more than 500 charge/discharge cycles
6. The battery is reliably sealed to prevent electrolyte leakage, and is suitable for various instruments and equipment.
7. It has a metal shell, which is strong and durable.
8. It can be used in a wide temperature range.
9. Manufactured in a strict quality management system, good quality has a reliable guarantee.
10. Green energy that does not pollute the environment.
3. What factors will greatly affect the battery life?
The dryness of the diaphragm and the increase in internal resistance are the main factors that determine the service life of the battery.
The dryness of the diaphragm used to absorb the electrolyte and the increase in internal resistance are the main factors that determine the service life of the battery.
Open valves and not following our recommended conditions for charging, discharging and storing the battery will also speed up drying.
A. The temperature of the battery
The ambient temperature of the battery is another factor that affects battery life.
We recommend using NiMH batteries in the temperature range of 0 to 40°C.
Especially in order to prolong the service life of Ni-MH batteries, we recommend charging them at room temperature.
If the battery is stored at high temperature for a long time, or repeatedly charged and discharged, the organic matter of the separator and the hydrogen storage alloy of the negative electrode will be damaged, thereby shortening the service life of the battery.
Because the oxygen consumption rate of the negative electrode of the battery slows down at low temperature, overcharging with a large current will increase the air pressure in the battery, causing the gas to be discharged through the safety valve.
B. Charging conditions
When a nickel-hydrogen battery has undergone hundreds of charge/discharge cycles, the battery voltage increases during charging.
This change in battery voltage is due to the increase in internal impedance after repeated charge and discharge.
The maximum charging current allowed for NiMH batteries has been set.
If the battery is overcharged, the negative electrode consumes the oxygen formed at the positive electrode, and the hydrogen storage alloy will be partially oxidized to affect the performance of the negative electrode.
Therefore, when charging nickel-hydrogen batteries, avoid overcharging, because repeated overcharging will shorten the life of the battery
C. Discharge conditions
When nickel-hydrogen batteries are charged and discharged hundreds of times, the battery voltage will decrease during discharge.
the relationship between the number of charge and discharge cycles and the battery voltage.
The change in battery voltage is caused by the increase in internal impedance after repeated charging and discharging.
If the Ni-MH battery is repeatedly deep-discharged while reverse polarity occurs, as mentioned before, the battery life will be shortened.
Therefore, avoid overuse.
4. What are the precautions for using the battery?
The design of the nickel-hydrogen battery takes into account various safety features, however, wrong use and disassembly of the battery pack may cause leakage, heat generation, fire or explosion.
In order to ensure the safe use of nickel-hydrogen battery packs and prevent these phenomena from happening, please strictly observe the following precautions.
restrictions on use
A. Restrictions on use
1: Restriction of use environment
--The temperature range for nickel-hydrogen batteries is as follows.
Using nickel-metal hydride batteries outside this range will damage battery performance and shorten battery life.
Use (discharge): 0 to 50°C.
Storage: -20 to 30°C.
-The temperature range for charging is as follows.
Charging the battery outside this temperature range will cause liquid leakage and heat generation, which will damage the battery performance and shorten the battery life.
Charging: 0 to 40°C
--Do not store or use the battery at high temperature, such as under strong direct sunlight, in a car in high temperature season, or directly in front of the heater, doing so will cause battery leakage, damage performance, and shorten battery life.
--When the battery is in a low temperature environment (below 0°C) or outdoor low temperature (below 0°C), please do not charge the battery.
This can cause the battery to leak fluid, reduce performance, and shorten battery life.
--Do not splash water or salt water on the battery, and avoid using and storing the battery in a humid environment, otherwise the battery is prone to heat and rust.
2. Restrictions on terms of use
--Use the specified charger and charge the Ni-MH battery pack according to the specified charging conditions.
--The number of batteries in series should not exceed 20.
--Do not short circuit the battery pack, it will damage the battery.
B. Preparation before use,please read the instruction manual
--Before using nickel-hydrogen batteries, please be sure to read the instruction manual and precautions.
After reading, keep the instruction manual close by for reference when needed.
If you do not fully understand the instructions or precautions, please contact our company representative.
--For the steps to charge the Ni-MH battery, please read the instruction manual of the charger.
--Please read the instruction manual of the device when installing or removing the battery from the device
C. Irregular use
1. Do not connect the battery to the power supply
- NiMH batteries have positive and negative terminals.
The battery and the charger must be connected correctly.
If the connection is reversed, the battery will leak, heat up and explode.
--Ni-MH batteries cannot be directly connected to the power supply.
Do not plug the battery pack connector into the cigarette lighter socket in the car.
Otherwise, it will cause liquid leakage, heat generation and explosion.
2. Check the battery before use
--If the newly purchased battery is rusty, hot or abnormal in other respects, do not start using it and return it to the store where it was purchased.
--If the battery is used for the first time or after a long time, be sure to charge the battery.
3. Irregular use
4. Do not use it outside the scope of the specified conditions of use
--Ni-MH batteries are not suitable for some devices.
Please read carefully the instruction manual and precautions of the equipment to be used with nickel-metal hydride batteries.
--Do not use nickel-metal hydride batteries on devices other than those specified for use.
This can cause fluid leakage, heat generation and explosion.
D. How to use
d1 : Note for users with children
--Please keep nickel-hydrogen batteries out of the reach of infants and young children.
Prevent infants from swallowing batteries by mistake.
If a battery is swallowed, contact your doctor immediately.
--When charging or using the battery, do not allow infants or young children to remove the battery from the charger or the device being used.
- If children use nickel-hydrogen batteries, parents should pay attention to teach him to use them according to the instructions
d2: Do not misuse the battery, otherwise it will cause leakage and heat.
--Do not mix nickel-metal hydride batteries with dry batteries or other batteries with different capacities, models and trademarks.
- Do not use new and old batteries or batteries with different levels of charge together
--Do not throw the battery into fire or heat it.
--Do not solder the battery directly.
--Do not use or charge the battery with the "+" and "-" poles upside down.
-Do not carry or store batteries together with metal chains, hair clips or other metal objects.
Avoid short-circuiting the "+" and "-" poles of the battery.
--Do not subject the battery to heavy impact or throwing.
- Do not use batteries in parallel.
d3: Do not use the battery when the safety device or applicable parts are not properly installed
The "+" terminal of the nickel-hydrogen battery has a safety valve to discharge the internal gas.
Therefore, do not deform the "+" terminal or block the vent hole.
Do not disassemble or modify nickel-metal hydride batteries.
Do not damage the safety valve assembly.
Otherwise it will cause heat generation, burning and explosion.
--Charge the Ni-MH battery according to the instruction manual.
Do not recharge the battery when it is fully charged.
This can cause fluid leakage and heat generation.
--When the battery is not in use, do not connect the nickel-metal hydride battery to the device for a long time.
After using the device, be sure to turn off the power.
Otherwise, fluid leakage may occur.
E. Maintenance and testing
-- check frequently
To prevent the NiMH battery from leaking or rusting when not in use, take the battery out of the device and store it in a place with low humidity and a temperature of -20 to 30°C.
-- Inspection and cleaning (including labels)
If the battery's terminals become dirty, it can lose contact with the device, interrupting the electrical flow or preventing charging.
Wipe the terminals with a dry cloth before using the battery.
-- Notes on usage issues
--Do not use faulty or abnormal batteries
