What is the capacity detection method for rechargeable lithium battery?

1500 mAh charging battery is full of electricity. When discharge current of 1500 Am can reach 1 hour mean that the capacity is enough. Use 750 Am discharge for 2 hours to test. But when the voltage is 0.9 V (1.2 V rechargeable batteries) will still release nominal current.

What we call the battery capacity, and actually refers to the capacity of the battery. That is to say 1500 mAh rechargeable battery discharge from 1.45 V to 1.45 V is released when the power is the capacity, we need below 0.9 V discharge capacity with less than we are, out of electricity less (low discharge will also affect the service life of the battery), generally good rechargeable battery discharge platform is good, for example: 1500 mAh battery from 1.45 V to 0.5

Put 0.9 V, C current discharge for 120 minutes, and then we will say the use of the battery capacity is 1500 mAh, during this time the relationship between current voltage time as shown in figure:

Good battery discharge platform will soon after the 0.9 V voltage drop, then put in a short time there will be less power. Instead of bad battery discharge from 1.45 V to 1.45 V, the voltage drop quickly, and after the 0.9 V voltage drop is very slow, this battery is the bad performance of the general capacity is also very low.

Note: I: amp or ma;

1 / f: [when], often only said \ "\", rather than the unit;

C: battery capacity, unit: Ann or mAh.

For example, when battery capacity is 800 mAh, the charging current of 0.1 C, equivalent to clear:

The battery charging current (I) = 0.1 [1] when/x (mAh) = 80 [ma]

F also called \ 'n hours filling \ "(put) electricity rate, f = 1 / (n)

Battery capacity measurement is generally measure the battery voltage. Charger detects the battery voltage during charging. When the voltage reaches voltage value, it is considered highly specified. For example, the lithium battery charging voltage of 4.2 V is considered highly. Detect the voltage of the voltage meter precision to achieve the accuracy of plus or minus 1%. The lithium battery will damage because of overcharge. If you want to monitor the battery charge and discharge, the book has a very mature circuit that you can refer to. If the only measure that is right. Calculate the load resistance capacity, discharge on standard current, and measure the voltage at this moment. As long as it can achieve or be closed to the nominal discharge time, it is OK.

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