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Main performance indexes of lithium ion batteries

by:UFO      2020-01-01
1. The capacity of lithium ion battery is divided into rated capacity and actual capacity. The rated capacity of the battery refers to the amount of electricity that the battery should provide when discharging to the termination voltage at a rate of 5h under the condition of ambient temperature of 20℃ 5℃, which is expressed by C5. The actual capacity of the battery refers to the actual amount of electricity released by the battery under certain discharge conditions, which is mainly affected by the discharge rate and temperature ( Therefore, strictly speaking, the battery capacity should indicate the charging and discharging conditions). Capacity unit: mAh, Ah (1Ah = 1000 mAh). 2. Lithium Ion battery internal resistance battery internal resistance refers to the resistance received by current flowing through the battery when the battery is working. It consists of ohmic internal resistance and polarized internal resistance. The large internal resistance value of the battery will lead to the reduction of the discharge working voltage of the battery and the shortening of the discharge time. The internal resistance is mainly affected by the battery material, manufacturing process, battery structure and other factors. Battery internal resistance is an important parameter to measure battery performance. 3. The voltage and open circuit voltage of lithium ion battery refer to the potential difference between the positive and negative poles of the battery when the battery is in non-working state, I . e. when there is no current flowing in the circuit. In general, the open circuit voltage of lithium ion batteries after being fully charged is 4. 1-4. About 2 V, the open circuit voltage after discharge is 3. About 0 V. The state of charge of the battery can be judged by detecting the open circuit voltage of the battery. The working voltage, also known as the terminal voltage, refers to the potential difference between the positive and negative poles of the battery when the battery is in the working state, that is, when there is current flowing in the circuit. In the discharge working state of the battery, when the current flows through the inside of the battery, there is no need to overcome the resistance caused by the internal resistance of the battery, so the working voltage is always lower than the open circuit voltage, which is the opposite when charging. The discharge working voltage of lithium ion battery is 3. About 6 V. 4. The discharge platform time of lithium ion battery. The discharge platform time refers to the discharge time to a certain voltage when the battery is fully charged. For example, the 3. The discharge platform time of 6V is charged at constant voltage to a voltage of 4. 2 V, and the charging current is less than 0. Stop charging at 02C, that is, after being fully charged, then put it on hold for 10 minutes and discharge to 3 at any rate of discharge current. The discharge time at 6V is the discharge platform time under this current. Because the working voltage of some electrical appliances using lithium ion batteries has voltage requirements, if it is lower than the required value, it will not work. Therefore, the discharge platform is one of the important standards to measure the performance of the battery. 5. Charge and discharge rate of lithium ion battery charge and discharge rate refers to the current value required by the battery to release its rated capacity within a specified time. 1C is equal to the rated capacity of the battery in value, usually expressed by the letter C. If the nominal rated capacity of the battery is 10Ah, 10A is 1C (1 magnification), 5A is 0. 5C, 100A is 10C, and so on. 6. Self-discharge rate of lithium ion battery self-discharge rate, also known as charge retention capacity, refers to the retention capacity of the battery under certain conditions when the battery is in an open circuit state. It is mainly affected by factors such as battery manufacturing process, materials and storage conditions. It is an important parameter to measure battery performance. 7. Charging and discharging efficiency of lithium ion batteries charging efficiency refers to the measurement of the degree to which the electric energy consumed by the battery during charging is converted into chemical energy that the battery can store. It is mainly affected by battery technology, formula and working environment temperature of the battery. Generally, the higher the ambient temperature, the lower the charging efficiency. Discharge efficiency refers to the ratio of the actual electric quantity released from the discharge to the end voltage under certain discharge conditions to the rated capacity of the battery, which is mainly affected by factors such as discharge rate, ambient temperature, internal resistance, etc, in general, the higher the discharge rate, the lower the discharge efficiency. The lower the temperature, the lower the discharge efficiency. 8. The cycle life of a lithium ion battery refers to the number of times the battery experiences charging and discharging under a certain charging and discharging system when the battery capacity drops to a specified value. Lithium Ion battery GB stipulates that the capacity retention rate of the battery after 500 cycles at 1C is above 60%.
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