18650 low temperature lithium ion battery performance parameters and precautions

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

Charging voltage: 4.2V; Nominal voltage: 3.7V; charging current: standard charging 0.

2C; standard charging method: 0.2ccc (constant current) charge to 4.2V, rechargeable CV (Constant voltage 4.

2V) charge until charging current≤0.05C; discharge cutoff voltage: 2.5V operating temperature: charge 0 ¡ã C ~ 45 ¡ã C; discharge -40 ¡ã C ~ 60 ¡ã C high temperature discharge: at 60±The temperature is 2 h in a high temperature tank at 2 ¡ã C, at which 0.

2c constant current is discharged to 2.5 V, and the effective discharge is 90% of the initial capacity; low temperature discharge: in -40±The temperature is 4 h in a low temperature tank at 2 ¡ã C, at which constant current 0.2c is discharged for 35 minutes, then 0.

1C constant current discharge to 2.5 V, effective discharge is 50% of the initial capacity; cycle life: -20±The 2 ¡ã C battery was saturated from 0.2c constant current pressure charged to 4.

2 V, put it on hold for 5 min, discharged from 0.2c current to 3.0V record discharge capacity, circulating 200 times, and the effective discharge was below the initial capacity of 60%; storage characteristics: 20±Under the conditions of 2 ¡ã C, charging the battery with 5.

5. Put the battery 50±7 days were stored at 2 ¡ã C, and then allowed to stand for 1 hour at normal temperature, discharged from 0.5c current constant flow to 3.

0V cutoff voltage. 18650 Lithium-Temperature Lithium Ion Battery Use Notes: (1) Charging voltage The charging voltage must not exceed the rated voltage specified in this standard (4.2V / battery).

4.25V is the highest limit of charging voltage, and the design of charger should meet this condition. When the battery voltage is higher than the rated voltage value, it may cause the charge and discharge performance, mechanical properties and safety performance of the battery, which may cause fever or leakage.

(2) The charging temperature battery is not to charge within ambient temperature range of 0 ¡ã C ~ 45 ¡ã C. (3) Prohibition of reverse charging correctly connects the positive and negative of the battery, which is strictly prohibited to charge reverse charging. If the battery is positive and negative, the battery will not be charged.

At the same time, reverse charging will reduce the charge and discharge performance, safety of the battery, and will cause fever, leakage. (3) Discharge current discharge current shall not exceed the maximum discharge current specified in this standard, and large current discharge can cause the battery capacity to reduce and lead to overheating. The battery can be discharged within ambient temperature range of -40 ¡ã C ~ 60 ¡ã C.

(4) Over-discharge should be noted that it may be in some kind of over-discharge state during the long-term unus of battery cells. For the occurrence of alert discharge, the battery should be charged regularly, maintaining its voltage between 3.6V to 3.

9V. Over-discharge can cause battery cell performance, loss of battery function. (5) The charger should have a device to prevent the battery discharge to the cutoff voltage prescribed by this standard.

In addition, the charger should also have a device to repeat charging, the steps are as follows: The battery should be precharged from 15 to 30 minutes before charging, so that the voltage of the (each) battery is reached. 3.0V above, fast charging.

The precharge step can be implemented using a timer. If the voltage (individual) battery is still up to 3.0V in time, the charger should be able to stop the next step, and display the battery / battery is in an inactive state.

(6) It is strictly forbidden to remove the battery core without disassembling the battery, and the disassembly of the battery may cause internal short circuit, which in turn causes the gas, fire and other problems. (7) Electrolyte harmful lithium-ion batteries theoretically there is no flowing electrolyte, in case an electrolyte leaks, it is visible to the skin, eyes or other parts, and immediately rinsing the electrolyte with water and seeking medical treatment. (8) It is strictly forbidden to put the battery in the fire in any case, do not combustion the battery or put the battery into the fire, otherwise it will cause the battery to burn, which is very dangerous, should be absolutely prohibited.

(9) It is forbidden to use the damaged battery cells that may be damaged by the impact during the transportation process. If there is any abnormal characteristics of the battery, if the battery is damaged, the outer casing is damaged, the electrolytic liquid gas, electrolysis Liquid leak, etc., the battery is not allowed.

Electrolytic solution leaks or dispentable electric electrolyte gas flavor should be far from the fire source.

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