The differences between normal operating current and capacity of lithium batteries are as follows:
Difference 1:
1. The meaning of operating current and capacity:< /p>
The operating current is the discharge current in actual use. Capacity is a unit of measurement for the amount of energy stored in a battery. This is the main battery indicator and is usually expressed in mAh. Taking 1AH as an example, 1AH is equal to 1000mAH, which means that the battery discharges with a current of 1A for about 1 hour. In actual use, the larger the current, the actual discharge time will be shortened.
Difference 2:
2. Capacity and charging current:
Capacitance and charging current are not necessarily related, but there is always some relationship. batteries, if you charge with low current, it will take much longer to fully chargeemps, so when designing a charger for a large capacity battery, it is usually more powerful than a small capacity battery.
That is to say, the current is greater. We know that the charger can be considered as a constant current source. If you look closely, each charger, i.e. online charging, has a different current.
Third difference:
3. Battery Performance:
One of the important performance indicators of battery performance is battery capacity, which indicates that under certain conditions (discharge rate, temperature, final voltage, etc.) The amount of electricity released by the battery (JS-150D can be used for discharge testing), that is, the capacity of the battery, usually in ampere-hours (abbreviated, expressed as A·H , 1A·h=3600C)
The formula for calculating the capacity of the battery C is C=∫t0It1dt (integrate the current I oft0 to t1). The battery is divided into positive and negative poles. Battery capacity is divided into actual capacity, theoretical capacity and rated capacity according to different conditions. Capacity C = discharge current (constant current) I × discharge time (hours) T. Discharge time T = capacity C / discharge current (constant current) I. Discharge current (constant current) I = capacity C / time discharge T.
:Characteristics of lithium-ion batteries:
Lithium-ion batteries have a very useful characteristic for measuring fuel, that is, when of discharge, the battery voltage will gradually decrease as power drains. And there is a fairly steep slope. This gives us another rough way to measure electricity.
The method of taking battery voltage is to measure the height of the water surface in the water tank to approximately estimate the volume of water remainingnt.
But in fact, the voltage of a lithium battery is much more complicated than measuring the height of still water in the water tank. Using voltage to estimate the remaining capacity of a battery has the following instabilities: For the same battery, with the same remaining capacity, the voltage value changes due to the magnitude of the discharge current. The higher the discharge current, the lower the voltage.Lithium-ion batteries with different types of electrode materials have very different discharge platforms. The discharge platforms of lithium cobalt batteries and lithium manganese batteries are completely different.
The above will cause voltage fluctuations and differences, making the battery capacity display unstable when using voltage to measure battery capacity on a mobile phone, because the phone mobile doesn't do itnot.It can be in a low current sleep state.
Severe temporary power losses, such as turning on the backlight, playing ringtones, especially passing the battery, will cause the battery voltage to drop quickly.
What is the difference between lithium battery capacity and rated capacity?
One of the important performance indicators of the battery is the capacity of the battery, which indicates that under certain conditions (discharge rate, temperature, termination voltage, etc.) the amount of electricity released by the battery (JS-150D can be used for discharge testing), it is i.e. the capacity of the battery, usually in units of amps and hours (abbreviated, expressed in A.H, 1A.h=3600C) Formula for calculating battery capacity C It is C=∫ t0It1dt (integrate current I from t0 to t1). Battery capacity is divided into actual capacity, capacitytheoretical and nominal capacity under different conditions. . The minimum capacity required to discharge to the final voltage at 25°C at a certain discharge rate is the battery capacity specified at the time of design and production. This is called the nominal capacity of a certain RH discharge rate. The battery capacity is usually calculated in AH (ampere-hour), and the other is calculated in CELL (plate unit) watts (W). (W/CELL) 1. Calculation AH (ampere-hour), battery discharge (constant current) I × discharge time (hour) T. For example, if a 7 Ah battery has a continuous discharge current of 0 .35 A, it can last 20 hours. 2. Charging time is based on 10 hours and charging current is 1/10 of battery capacity. Fast charging will shorten battery life. Battery capacity refers to the amount of energy stored in the battery. The battery capacity unit is "mAh",and the Chinese name is milliampere-hour (when measuring large capacity batteries such as lead-acid batteries, for convenience, it is usually expressed as "Ah", the Chinese name is amp-hour, 1Ah=1000mAh ). If the rated capacity of the battery is 1300 mAh, if the battery is discharged with a current of 0.1 C (this is the capacity of the battery) or 130 mA, then the battery can continue to work for 10 hours ( 1300 mAh/130 mA = 10 hrs); the discharge current is 1300 mA, then the power supply time is only about 1 hour (the actual working time may vary due to individual differences in actual battery capacity). This is an analysis under ideal conditions. The actual current of a digital device cannot always be constant at a certain value (taking a digital camera as an example, the operating current will vary greatly due to opening or closingture of components such as LCD screens). and flashlights).
The difference between lithium battery capacity and rated capacity is as follows:
1. The capacity of a lithium battery generally refers to the amount of electricity the battery can provide under certain discharge conditions. This is an important indicator of the electrical performance of the battery. The capacity of lithium battery can be divided into actual capacity, theoretical capacity and rated capacity. Actual capacity refers to the amount of electricity a lithium battery can produce under certain conditions. It is equal to the product of the discharge current and the discharge time, and its value is less than the theoretical capacity. theoryThe capacity is the highest theoretical value calculated by calculating the mass of active material according to Faraday's law. Rated capacity refers specifically to the capacity of thea lithium battery specified by the lithium battery manufacturer, which represents the maximum capacity of the battery under specific conditions or the capacity in the most ideal state. For example, the GB/T18287-2000 standard proposed by the Ministry of Information Industry of the People's Republic of China states that the rated capacity of lithium batteries refers to the power that the battery should provide when is discharged to the termination voltage at a termination voltage. duration of 5 hours at an ambient temperature of 20 ± 5°C.
2. The numerical values are different. In actual use, the actual capacity of lithium batteries is often lower than their rated capacity. This is because it is difficult for the battery to reach its optimal state during use and will be affected by many factors, such as discharge conditions, ambient temperature, battery aging.i.e., etc.