148187
5 Technical requirements
5.1 Cell operating conditions
Charge temperature 0 ~ 45°C, Discharge temperature -20 ~ 60°C
5.2 Cell testing conditions
Unless otherwise specified, all tests stated should be done at 25 ± 2°C.
5.3 Requirement of the testing equipment
The voltage measurement device:
not less than 0.5 grade
The current measurement device:
not less than 0.5 grade
AC Impedance:
1000 Hz
Temperature meter:
precision ≤ 0.5°C
The size measurement device:
± 0.1%
The quality measurement device:
± 0.1%
5.4 Electrochemical characteristics
Unless otherwise specified, the cell should be fresh cell and tested by standard charge and discharge.
5.4.1
Rate discharge capability
(1) Charge: 0.5C constant current charge to 4.2V followed by 4.2V constant voltage charge to cut-off current ≤ 0.01C;
(2) Discharge: 0.2C, 0.5C, 1C, 2C, 3C constant current discharge to cut-off voltage ≤ 2.5 V.
Current / Relative Capacity:
0.2C / 100%, 0.5C / ≥96%, 1C / ≥93%, 2C / ≥90%, 3C / ≥88%
5.4.2
RT cycle life
(1) Charge: 0.5C constant current charge to 4.2V followed by 4.2V constant voltage charge to cut-off current ≤ 0.01C (32 mA);
(2) Discharge: 1C constant current discharge to cut-off voltage ≤ 2.75V.
Discharge capacity of 801th cycle
Original discharge capacity
≥80%
(1) Charge: 0.5C constant current charge to 4.15V followed by 4.15V constant voltage charge to cut-off current ≤ 0.05C (162 mA)
(2) Discharge: 1C constant current discharge to cut-off voltage ≤ 3.00V.
Discharge capacity of 1001th cycle
Original discharge capacity
≥80%
5.4.3
High-low temperature discharge performance
(1) Charge: 0.5C constant current charge to 4.2V followed by 4.2V constant voltage charge to cut-off current ≤ 0.01C at 25±2°C;
(2) Discharge: 0.2C constant current discharge to cut-off voltage ≤ 2.5V at 25°C, 60°C, 45°C, 10°C, 0°C, -10°C, -20°C.
Temperature / Relative Capacity:
25°C / 100%, 60°C / ≥95%, 45°C / ≥95%, 10°C / ≥88%, 0°C / ≥85%, -10°C / ≥75%, -20°C / ≥70%
5.4.4
Storage performance at 25°C (100% SOC)
(1) Charge: 0.5C constant current charge to 4.2V followed by 4.2V constant voltage charge to cut-off current ≤ 0.01C; Discharge: 0.2C
constant current discharge to cut-off voltage ≤ 2.5V, to obtain the initial capacity;
(2) Charge: 0.5C constant current charge to 4.2V followed by 4.2V constant voltage charge to cut-off current ≤ 0.01C;
(3) Stored at 25 ± 2°C for 28 days;
(4) Discharge: 0.2C constant current discharge to cut-off voltage ≤ 2.5V, to obtain the residual capacity;
(5) Charge: 0.5C constant current charge to 4.2V followed by 4.2V constant voltage charge to cut-off current ≤ 0.01C; Discharge: 0.2C
constant current discharge to cut-off voltage ≤ 2.5V, to obtain the recovery capacity.
Capacity / Relative Capacity:
Residual capacity / ≥90%, Recovery capacity / ≥95%, Initial capacity / ≥100%
5.4.5
Storage performance at 60°C (100% SOC)
(1) Charge: 0.5C constant current charge to 4.2V followed by 4.2V constant voltage charge to cut-off current ≤ 0.01C at 25±2°C; Discharge:
0.2C constant current discharge to cut-off voltage ≤ 2.5V at 25±2°C, to obtain the initial capacity;
(2) Charge: 0.5C constant current charge to 4.2V followed by 4.2V constant voltage charge to cut-off current ≤ 0.01C at 25±2°C;
(3) Stored at 60 ± 2°C for 28 days;
(4) Kept at 25 ± 2°C for 5 hours;
(5) Discharge: 0.2C constant current discharge to cut-off voltage ≤ 2.5V at 25±2°C, to obtain the residual capacity;
(6) Charge: 0.5C constant current charge to 4.2V followed by 4.2V constant voltage charge to cut-off current ≤ 0.01C at 25±2°C; Discharge:
0.2C constant current discharge to cut-off voltage ≤ 2.5 V at 25±2°C, to obtain the recovery capacity.
Capacity / Relative Capacity:
Residual capacity / ≥85%, Recovery capacity / ≥90%, Initial capacity / ≥100%
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