Analyze lithium battery charge and discharge on the significance of lithium ion battery

The lithium battery lithium is a historical concept, early battery is lithium manganese batteries, lithium batteries discharge for the REDOX reaction, the discharge process of a battery reaction characteristics. Later in the lithium ion batteries, its reaction principle and lithium manganese battery is completely different, but it is now habitually called the lithium ion battery "lithium battery", instead of on the use frequency is much higher than the original meaning of lithium manganese battery, therefore, we will mainly analysis on the meaning of the lithium ion battery, lithium battery charge and discharge.

On the basis of the original lithium battery, SONY's first invented by the carbon material for the anode, lithium compounds as the anode of lithium battery, charging and discharging process only lithium ion, lithium metal, this is the lithium ion battery, and people used to place on the title of lithium battery.

First, we to explore the problem of lithium battery, lithium battery problems mainly involve whether lithium battery charging method and lithium battery charge electricity judgment, both of these problems has been detailed in the article how lithium battery charging, here I just roughly. Lithium battery charging process is divided into two steps: constant current charging process + constant-voltage charging process, which accounts for most of the charging time constant current charging process, constant voltage charging is a supplementary charge process. Pay attention to in the process of charging of lithium battery overcharge, normal lithium battery charger, will go to set according to the characteristics of lithium battery charging procedure, there will not be too often lithium battery pack with a protective plate, can prevent the lithium battery overcharge situation.

Lithium battery charging current and voltage are the two most important parameters in the lithium battery, it is not only related to lithium battery performance also relates to the use safety of lithium-ion batteries, the big electric current or voltage rechargeable lithium battery performance will be influenced, or has the dangerous situation such as fire explosion, so time to lithium batteries must pay attention to the charging voltage and charging current, also has chosen the lithium battery charger, lithium battery voltage of 4.2 V single section, multiple class lithium battery charging voltage = 4.2 * lithium battery serial number, such as three series of lithium battery charging voltage is 4.2 * 3 = 12.6 V. Considering the charging time should not be too long, usually set for lithium battery charging current 0.5 C.

The use of lithium battery process is the process of lithium-ion battery discharge. At this moment, the cathode carbon layer of emergence, lithium ions movement back to the anode, back to the anode of lithium ion, the more the higher the discharge capacity, usually say that the lithium battery capacity is to point to in 0.2 C discharge system of lithium battery discharge capacity. Lithium battery discharge is the charging process of movement, because the charge and discharge performance of lithium ion in the reciprocating movement of the positive and negative electrode, so the lithium battery and the defendant is called a rocking-chair batteries.

Lithium battery discharge with the battery voltage drop process, if use small discharge current, discharge time is long, the voltage drop is slow; If with large discharge current, voltage drop quickly, the discharge time is short. Section from the point of the total power output, a lithium-ion battery with small current discharge is bigger than with large current discharge capacity available, the reason is that electricity flow resistance is also big.

IEC standard lithium-ion battery discharge current of 0.2 C, this is because a pale imitation can better play to the performance of lithium-ion batteries. And the actual use of lithium battery discharge current can be adjusted according to actual needs and the status of the battery, such as ratio of lithium battery pack, the discharge current can be set higher.

In addition, attention should be paid to the lithium battery discharge by the voltage, the lithium battery discharging termination voltage, the ideal of lithium battery discharge cut-off voltage is 3.0, but the actual use of lithium battery discharge by the voltage Settings will be different, usually is lower than 3.0 V, the purpose is to make full use of the battery, but the most common setting discharging termination voltage of 2.75 V. To terminate when the battery discharge to recharge the battery voltage, if under the discharging termination voltage continue to let the lithium battery discharge will cause had spent lithium-ion batteries, excessive discharge that may influence the reliability of li-ion batteries, even irreversible capacity loss. Fortunately, now are added in the lithium battery protection board, can prevent the occurrence of lithium battery over discharge conditions, protect the performance of lithium-ion batteries.

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