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Battery power calculation method, how to calculate power

Electricity refers to the amount of electrical energy required by electrical equipment, also known as electrical energy or electrical work. The unit of electrical energy is kilowatt·hour (kW·h), also known as electrical degrees, W=P*t.

1. Electricity consumption of electrical appliances (degrees) = sum of electric power consumption (W) * power consumption time (H)/1000.

2. Battery capacity (WH) = battery voltage (V) * battery capacity (AH).

3. Battery power (WH) = battery voltage (V) * battery capacity (mAH)/1000.

9*0.8=7.2w=0.0072KW, one hour power consumption is 0.0072 degrees;

9*1=9w=0.009KW, power consumption is 0.009 kWh per hour.

Then the total power consumption in 24 hours is (0.0072+0.009)*24=0.388 degrees.

Battery capacity is one of the important performance indicators to measure battery performance. It represents the amount of electricity released by the battery under certain conditions (discharge rate, temperature, termination voltage, etc.) (JS-150D can be used for discharge test), that is, the battery capacity, usually The unit is ampere·hour (abbreviated as A·H, 1A·h=3600C).

The battery capacity is divided into actual capacity, theoretical capacity and rated capacity according to different conditions. The calculation formula of battery capacity C is C=∫t0It1dt (integrate current I from t0 to t1), and the battery is divided into positive and negative poles.

Expansion information

Common batteries

Dry cell

Dry batteries are also called manganese-zinc batteries. The so-called dry batteries are relative to voltaic batteries. The so-called manganese-zinc refers to its raw materials. For dry batteries of other materials, such as silver oxide batteries, nickel-cadmium batteries. The voltage of the manganese-zinc battery is 15V. Dry batteries consume chemical raw materials to generate electricity. Its voltage is not high, and the continuous current it can generate cannot exceed 1 ampere.

Lead storage battery

Storage batteries are one of the most widely used batteries. Fill a glass tank or plastic tank with sulfuric acid, and then insert two lead plates, one is connected to the positive electrode of the Charger, and the other is connected to the negative electrode of the Charger. After more than ten hours of charging, a battery is formed. There is a voltage of 2 volts between its positive and negative poles. The advantage of the battery is that it can be used repeatedly. In addition, because of its extremely small internal resistance, it can provide a large current. Use it to power the car's engine, and the instantaneous current can reach more than 20 amperes. When a battery is charged, it stores electrical energy, and when it discharges, it converts chemical energy into electrical energy.

lithium battery

A battery with lithium as the negative electrode. It is a new type of high-energy battery developed after the 1960s. According to the different electrolytes used, it is divided into:

①High temperature molten salt lithium battery;

②Organic electrolyte lithium battery;

③Inorganic non-aqueous electrolyte lithium battery;

④Solid electrolyte lithium battery;

⑤Lithium water battery.

The advantages of lithium batteries are that the single battery has high voltage, large specific energy, long storage life (up to 10 years), good high and low temperature performance, and can be used at -40 to 150°C. The disadvantage is that it is expensive and not safe. In addition, voltage lag and safety issues need to be improved. The vigorous development of power batteries and the emergence of new cathode materials, especially the development of lithium iron phosphate materials, are of great help to the development of lithium batteries.


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