Number
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Item
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Test profile
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Specification
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1
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Appearance and Dimension
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1.Eyeballing
2.Test cells’ dimension with slide caliper
Without plates.
3.The cell’s thickness should be tested with the cell clamped. The pressure should be 50N-200N.
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No deep scratch, No leakage , dimension should refer to the attached drawing 2
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2
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Weight
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Electronic Scale, without plates
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1010±20g
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3
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Open Circuit Voltage●
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Measure the open circuit voltage within 1h after charge cells per 4.3.1. without plates
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≥3.35V
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4
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Rated discharge capacity●
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Charge cells per 4.3.1. Then discharge cells at a 1C(A) current to 2.0V within 1h and measure the capacity.
The cycle can repeat 5 times, when the capacity of one cycle meet the requirement, the test can be terminated.
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1C capacity ≥ Nominal capacity
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5
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Maximum charge current
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1、Discharge cells at a 1C (A) current to 2.0V within 1h after charge cells per 4.3.1. And record the capacity；
2、Charge cells to 3.65V, charge shall be terminated when the charge current has tapered to 0.05C(A), the charge current is nC .
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3C (continuous)
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76
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Pulse Charge
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Charge cells per 4.3.1, then discharge to 50%SOC at 1C (A) current. Rest 30min.
Charge the cell at pulse current. Charge shall be terminated when the voltage reach 3.65V or charge withstand 30s.
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Max current:
4C (50%SOC, 30s)
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7
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Maximum discharge current
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1、Discharge cells at a 1C (A) current to 2.0V after charge cells per 4.3.1. And record the capacity；
2、Charge cells at 1C(A) current，and discharge to 2.0V at a current of nC .
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5C (continuous)
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8
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Pulse discharge
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Charge cells per 4.3.1, then discharge to 50%SOC at 1C(A) current. Rest 30min.
Discharge cells at pulse current, discharge shall be terminated when the voltage reach 2.0V or discharge withstand 30s.
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Max current:
6C (50%SOC, 30s)
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9
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Cycle Life●
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Single cell, stabilized between 2 metallic plates (alumina); Cycle schedule is as below:
Charge: CC/CV, 1C charge to 3.65V and 0.05C(A) cut-off;
Rest: 10min;
Discharge: 1C to 2.0V;
Rest: 10min;
A cycle is defined as one charge and one discharge. Discharge capacity shall be measured after 3000 cycles.
Test temperature: (25±2)℃
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Discharge capacity (3000th Cycle) ≥80% of Nominal Capacity
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10
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Capacity Retention●
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1.After charge per 4.3.1. store the testing cells for 30 days at the environment temperature of (25±2)℃,then discharge to 2.0V at a 1C(A) current.
2.After charge per 4.3.1. store the testing cells at (60±2)℃ for 7 days, then discharge to 2.0V at a 1C(A) current and measure the capacity.
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Residual capacity≥90% of Nominal capacity
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11
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Characteristics at high temperature
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Cells shall be charged per 4.3.1 and store for 5h at (60±2)℃, then discharge to 2.0V at a 1C(A) current and measure the capacity.
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Residual capacity≥90% of Nominal capacity
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12
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Characteristics at low temperature
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Cells shall be charged per 4.3.1 and store for 24h at (-20±2)℃, then discharge to 1.8V at a 1C(A) current and measure the capacity。
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Residual capacity≥70% of Nominal capacity
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13
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Airproof Characteristics★
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Weighed the testing cells before the storage test with an electronic scale which has a minimum scale of 0.001g, storage the cells at 60℃，95%RH for 16 hours. Test the weight again and then calculate the weight loss.
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Loss of weight < 300 mg
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