1. Conventional physical parameters of 18650 lithium-ion batteries:
Type - Sealed cylindrical, rechargeable lithium-ion battery;
Model - ICR18650;
Nominal voltage - -3.6V;
Weight - approximately 45g;
CamAh -- --2000mAh;
Charging voltage - -4.200 ± 0.049V;
Minimum discharge termination voltage - -2.75V;
Maximum charging termination voltage - -4.23V;
Maximum continuous charging current -1500mA;
Maximum continuous discharge current -3000mA;
Size (including heat shrink jacket)
Diameter: d - -18.0 ± 0.2mm;
Height: h-65.0 ± 0.5mm;
Minimum capacity - -2000mAh;
Maximum capacity -3400mAh;
Internal resistance (20 ℃± 5 ℃, measured after full charge) - - - less than 80mQ;
Charging conditions: 20 ℃± 5 ℃;
Standard charging -1000mA to 4.2V, 4.2V constant voltage to current less than 20mA;
Fast charging -1500mA to 4.2V, with a constant voltage of 4.2V until the current is less than 20mA;
Usage environment (recommended)
Storage - Temperature (15-35 ℃);
Relative humidity (45-75%);
Atmospheric pressure (86-106kPa);
Discharge -20 to 60 ℃;
Standard charging -0 to 45 ℃;
Relative humidity -<93%;
Atmospheric pressure -86 to 106kPa;
Standard testing environment (unless otherwise required)
Temperature -20 ℃± 5 ℃;
Relative humidity -45 ± 20%;
2. Conventional chemical performance (electrical performance) requirements parameters for 18650 lithium-ion batteries:
(1) Appearance structure, visually free of cracks, scratches, deformations, stains, and electrolyte leakage.
(2) Standard test strip: If there are no special requirements, the test should be conducted under conditions of 20 ± 5 ℃ (temperature) and 65 ± 20% (humidity). The accuracy level of the ammeter and voltmeter used in the test is ≤ 0.5.
(3) Standard charging
Charge the battery at a current of 0.5ItmA in an environment of 20 ± 5 ℃ and 65 ± 5% RH until the voltage of the individual battery is 4.2V, then switch to constant voltage 4.2V charging until the charging current is less than 20mA and stop charging.
(4) Fast charging
Charge at a constant current of 1500mA in an environment of 20 ± 5 ℃ and 65 ± 5% RH until the voltage of the individual battery is 4.2V, then switch to constant voltage 4.2V charging until the charging current is less than 20mA and stop charging.
(5) Rated capacity
Refers to discharging the battery at a constant current of 0.5mA to a termination voltage of 2.75V before charging in an environment of 20 ± 5 ℃ and 65 ± 5% H; Leave it for 15 minutes after standard charging; Discharge capacity at 0.2ItmA to 2.75V. Required discharge capacity: ≥ 100% C5mAh.
(6) Fast discharge capacity
Refers to discharging the battery at a constant current of 0.5I mA to a termination voltage of 2.75V before charging in an environment of 20 ± 5 ℃ and 65 ± 5% H; Leave it for 15 minutes after standard charging; Discharge capacity at 0.2ImA to 2.75V. Required discharge capacity: ≥ 90% C5mAh
(7) Cycle life
Discharge the battery according to the standard discharge requirements and let it stand for 15 minutes. In an environment of 20 ± 5 ℃ and 65 ± 5% RH, charge according to the fast charging requirements and let it stand for 15 minutes. Discharge at a current of 1500mA until the battery terminal voltage reaches the termination voltage of 2.75V. Cyclic charging and discharging, when the discharge capacity of any cycle is less than 80% CsmAh, the service life ends. The number of cycles is required to be greater than or equal to 300
(8) -20 ℃ discharge performance
The battery should be charged according to the standard charging method; The battery should be stored in an ambient temperature of -20 ℃± 2 ℃ for 16-24 hours; The battery should be discharged at a constant current of 0.2ImA to a termination voltage of 2.75V at an ambient temperature of -20 ℃± 2 ℃; Discharge capacity ≥ 60% C5mAh