It cannot be converted directly. Wh is the quantity of electricity, which is a quantity directly proportional to voltage, current and time. MAh is generally used as a battery charge and discharge indicator. It is an indicator proportional to the current and duration of charging (discharging) of the battery. To make it comparable or convertible to Wh, the battery voltage must also be known.
For example, if it is 5 V, then we can say that the relationship between the discharge time and the current of 1 Wh of electricity at a voltage of 5 V is 1 Wh/5V = 1VAh/5V = 0.2Ah = 200mAh, that is, with a discharge current of 100mA, it can be used for 20 hours.
Detailed information:
Ampere-hours are another way of expressing electricity.
A coulomb of electricity is a small qimpractical quantity to apply in many places. The most commonly used unit is the ampere-hour. An amp-hour of electricity is the amount of electricity obtained by flowing one amp of electricity continuously for one hour. Ampere hours are commonly used in batteries, electroplating, and other electrochemical systems.
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References:
1 kilogram of lithium battery is equivalent to how many kilograms of lead-acid battery
Indicates the capacity of this the lithium battery is 25,000 mah.
1. mwh is a unit used to express electrical energy. The mAh is an irregular unit used to express electricity.
2. If mwh needs to be converted to mAh, you need toalso know the operating voltage.
3. For example, for a lithium battery with a nominal capacity of 3.7 V and 1000 mAh, its nominal electrical energy is 3.7 V × 1000 mAh = 3700 mWh, or mWh divided by the voltage of the 'food. is mAh. For example, for a 25,000 MWh power supply, the voltage is 3.7 V, then 25,000 MWh/3.7 V≈6757 mAh
Comparison of the energy density of a battery lithium and the energy of a lead acid battery. In comparison, lithium batteries have a higher energy density, lead acid batteries are 30WH/KG and lithium batteries are 110WH/KG. The biggest advantage of lithium batteries is that they have relatively high energy and high storage energy density, which has reached 460-600 Wh/kg, about 6-7 times that of lead-acid batteries.< /p>
Comparison of energy density of lithium batteries and lead-acid batteries
Energy density refers to the energy released by the battery per unit mass or per unit volume, i.e. the volume ratio Energy or mass energy ratio. The energy density value of lithium batteries reflects the relationship between the battery energy size and the size: energy density ρ = E/V. The greater the energy density of the battery, the smaller the size of the battery with the same energy. Or, given equal size, the greater the energy density of the battery, the greater the energy of the battery.
Whether it is volume or weight specific energy, lithium batteries are more than 3 times higher than lead acid batteries. Lithium batteries are smaller and lighter. Long life expectancy. The lifespan of lithium batteries used in electric vehicles is typically more than 800 times longer. Lithium batteries using materialsLithium iron phosphate cathode ux can reach about 2000 times, which is 1.5-5 times longer than lead-acid batteries.
The current energy density of lithium batteries is generally 200-260 wh/g, and lead battery is generally 50-70 wh/g. The weight energy density of lithium batteries is therefore 3 to 5 times higher than that of lead. -acid, which means that with the same capacity, lead-acid batteries are 3-5 times larger than lithium batteries, so lithium batteries have an absolute advantage in lightening energy storage devices.
Lithium batteries have relatively high energy. It has high storage energy density, currently the highest has reached 460Wh/kg, about 5-10 times that of lead-acid batteries, and may be higher in the future (specific energy refers to energy per unit weight or unit volume, the specific energyue is expressed in Wh/kg or Wh/L.) With the development of lithium battery safety technology, the use of lithium batteries will become safer and more popular.
Generally, under the same volume, the energy density of lithium-ion batteries is 2.5 times that of nickel-cadmium batteries and 1.8 times that of nickel-metal hydride batteries. Therefore, when the battery capacity is equal. , the energy density of lithium-ion batteries will be higher than that of nickel-cadmium and nickel-metal hydride batteries which are smaller and lighter.
At present, the single energy density of BYD's lithium iron phosphate battery is 150 Wh, and BYD plans to continue to increase the energy density to 160 Wh. In addition to lithium iron phosphate batteries, BYD is also simultaneously developing ternary lithium batteries. If ternary lithium battery technology is combined with lithium iron phosphate batteries and some adjustments are made to the initial use of graphite as an anode material, then around 2020, BYD plans to increase the single energy density of lithium iron phosphate batteries to 200 Wh.
The energy density of lead-acid batteries is relatively low, so they cannot be used as a power source for electric vehicles, because if a lead-acid battery is used to drive a family car on more of 200 km, almost a ton of batteries will be needed. This weight is too big to be practical. Of course, lead poisoning is also a factor. The cycle performance of lead-acid batteries is also relatively poor. Energy density alone may determine that lead-acid batteries cannot be used as a pure energy source for electric vehicles.
Traditional lead acid batteries havelow mass and volume energy density, and the energy density is only about 1/3 of that of lithium-ion batteries., about half of the nickel-hydrogen battery, and is larger, so it is not suitable not for use in light weight and small size situations. Traditional lead-acid batteries have a short lifespan and theoretical cycle times are about 1/3 those of lithium-ion batteries.
In order to highlight the long battery life and performance of their products, many lithium battery manufacturers often use battery energy density as an advertising gimmick. At present, the energy density of ternary lithium batteries with higher energy density is only 200 mAh/g. Currently, improving energy density is limited to increasing battery size. It will take a long time to get un qualitative change through changes in the chemical system.