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Discharge C Rate and Correct Charging and Discharging Method of Polymer Lithium Battery

Sep 07, 2022

Discharge C Rate and Correct Charging and Discharging Method of Polymer Lithium Battery



Polymer lithium battery is a kind of soft packed lithium battery with gel electrolyte, also known as pouch lithium battery. For the new polymer battery, since the battery will automatically enter the sleep state after being placed for a period of time, the capacity of the polymer battery is very low at this time, and it will also affect the shortening of the service time of the battery.
Polymer lithium battery

Charging and discharging methods of polymer lithium battery
1. Discharging
The discharge current of polymer lithium battery shall not exceed the following standards, and the discharge must be carried out within the scope of this standard.
The discharge current of single cell must be less than 2C5A.
The temperature range of polymer lithium battery discharge is - 20 ~ + 60 ℃.
The discharge termination voltage of single cell shall not be less than 2.75V.

2. Charging
The charging current and voltage of the polymer lithium battery shall not exceed the following standards. If the specified value is exceeded, the charging and discharging performance, mechanical performance and safety of the battery cell may be damaged, and heating and leakage may be caused.
The polymer lithium battery charger must be able to charge at constant current and voltage. The charging current of the single battery during charging must be below 1C5A.
The temperature range during charging is 0 ~ + 45 ℃.
When the polymer lithium battery is charged, the voltage shall not exceed 4.23V.

Discharge C rate of polymer lithium battery:
C: It is used to represent the ratio of battery charge and discharge current, i.e. magnification. For example, for a 1200mAh battery, 0.2C indicates 240mA (0.2 magnification of 1200mAh), and 1C indicates 1200Ma (1 magnification of 1200mAh). The charge and discharge efficiency is also related to C (rate). Under the condition of 0.2C, the charge and discharge efficiency of polymer lithium battery should be 99.8%.
polymer lithium battery charger


Correct charging and discharging mode of polymer lithium battery:
Charging: the charging and discharging of polymer lithium batteries and liquid lithium batteries are actually the same. There are mainly two ways of constant voltage charging and constant current charging, which can also be carried out alternately. In constant current charging, the capacity of the battery increases with time, and the internal resistance of the battery also increases constantly, so the charging becomes slow. At this time, we should not think that the charging is complete, but it will take a period of slow charging. While the manufacturers of general polymer lithium-ion batteries first use constant current to charge the batteries, and then use constant voltage current to charge the batteries. Current, voltage and cell phone power are all changing with time, which ensures that the cell phone's battery can be fully charged quickly.

Discharge, we all know that as long as we turn on the mobile phone, we are discharging the polymer battery. However, in the test, constant current discharge is often used to test the performance of the battery in all aspects. When we use mobile phones, if we find that the battery is hot or the mobile phone is hot. Turn off the mobile phone in time and wait for the mobile phone or battery to cool before using. Because heating means that the voltage in the battery is unstable, and the voltage output to the mobile phone is also unstable. Such discharge is not allowed. We should try to keep the battery discharge constant, so as to extend the service life of the mobile phone.

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 battery cell testing machine


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