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Lithium ion battery manufacturers teach you the capacity test method of lithium ion batteries. The capacity of lithium-ion battery is the premise of how long the equipment can be used. Generally, lithium-ion battery manufacturers have special equipment for testing to ensure the quality of the products shipped. The capacity test is based on the full charge voltage and the set termination voltage. Because the minimum discharge voltage of the lithium-ion battery is 2.75V, the voltage less than 3V has no meaning for the lithium-ion battery test.

The capacity of lithium-ion battery refers to the capacity of the battery, usually in "ampere-hours" and "milliampere-hours". For example, the capacity of lithium-ion battery is 500mAh, which means that the battery can work for 50 hours if the current is 10mA during operation. The lithium-ion battery is generally tested with 0.5C discharge.

1. Fully charge the battery. The voltage of a single lithium-ion battery after fully charging is 4.2V;

2. The multimeter is a lithium-ion battery with constant current of 0.5C, and the discharge voltage is set to 3v relative to the battery capacity;

3. The battery capacity is determined by multiplying the constant current discharge time by the discharge current; Test: If the constant current discharge cannot reach two hours, then the nominal voltage is not enough, and the lithium ion battery may be counterfeit.

Lithium ion battery manufacturer teaches you the capacity test method of lithium ion battery

Taking 1000mAh lithium-ion battery as an example, we should first understand several voltage values of lithium-ion battery in theory:

1. Charging termination voltage: It is also no-load voltage, that is, the highest voltage when it is not working, generally 4.2V.

2. Working/nominal voltage: It is also the load voltage. The voltage under normal operation is generally 3.7V.

3. Discharge termination voltage: that is, the voltage at which the battery cannot work. There are different designs of 3V and 2.75V.

To start the test, first use the charger to fully charge the battery with a full charge voltage of 4.2V, and then use a multimeter as a constant current load at 0.2C (i.e. 1000 × 0.2=200mA) discharge, set the discharge voltage of the multimeter to 3V. If the discharge time reaches 5 hours, it means that the battery is qualified. The current lithium-ion battery can generally discharge to 2.75V, while the discharge depth is the same as that of the previous 3V terminal voltage, which is 80%, but it can be discharged for 8 hours, indicating that the power of the lithium-ion battery has been improved.

The above so-called qualified and unqualified are related to the nominal capacity. Nominal capacity=discharge current × Discharge time. If the above discharge time is not enough, it means that the marked capacity of lithium-ion battery is not enough 1000mAh, which is a kind of capacity demarcating behavior and a kind of deception to consumers.

The capacity measurement method of lithium ion battery is basically the same as that of battery discharge performance measurement, including constant current discharge method, constant resistance discharge method, constant voltage discharge method, constant voltage and current discharge method, continuous discharge method and intermittent discharge method. The capacity of the battery can be calculated according to the discharge time and current.

Constant current method circuit: the advantage of this method is that the current is stable during the discharge process, so its capacity can be calculated conveniently.

Sorting detection: batteries of different types and different degrees of old and new cannot be used, so as to avoid overcharge and overcharge due to mismatched battery capacity. In addition, the overall performance of the battery pack is generally determined by the battery with the worst performance. As for the primary battery, the capacity test is destructive, so the product consistency can only be maintained through strict production control.

The above is the test method of lithium-ion battery capacity. The battery capacity is an important content to determine the quality of lithium-ion battery.

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