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In the structure of lithium batteries, the separator is one of the key inner layer components
.
For the lithium battery series, since the electrolyte is an organic solvent system, a separator material resistant to organic solvents is required, and a high-strength thin-film polyolefin porous membrane is generally used
.
GB/T36363-2018 "Polyolefin separator for lithium ion battery" test standard requires lithium battery separator to have sufficient mechanical properties, including puncture strength, tensile strength, air permeability,
etc.
The smaller the value, the better the performance of the lithium battery
.
Today we will analyze the performance test requirements and test methods of lithium-ion battery separators in detail
.
1.
Air permeability is the time required for 100 mL of air to pass through a diaphragm with an area of 6.
45 cm2 under a pressure of 1.
21 kPa in a test temperature and humidity environment
.
PAPT-B01 Air Permeability Tester 2.
Thickness deviation: The uniformity of the thickness of the diaphragm includes the uniformity of the longitudinal thickness and the uniformity of the transverse thickness, but in comparison, the transverse thickness uniformity is more important, and generally must be controlled within 1um
.
PTT-03A Thickness Tester 3.
Tensile strength, elongation at break: This test is carried out in accordance with the provisions of GB/T1040.
3-2006, using a width of (15+0.
1) mm to obtain a type 2 sample, MTL (PC ) The initial distance between the clamps of the tensile testing machine is (100+5) mm, and the test speed is (250+10) mm/min
.
4.
4.
Puncture strength Flatten and clamp the lithium battery separator in the MTL (PC) tensile testing machine fixture, puncture at a rate of (100+10) mm/min, and take out the sample after completion, according to GB/T6672-2001.
It is stipulated that the thickness test of 4 points is carried out around the pinhole as shown in Figure 5, the average value is taken, and the puncture strength is calculated according to formula (8)
.
If there are unqualified items in the physical performance and electrical performance results of the ETT-AM tensile testing machine, the sampling should be doubled in the original batch, and the unqualified items should be re-inspected
.
.
For the lithium battery series, since the electrolyte is an organic solvent system, a separator material resistant to organic solvents is required, and a high-strength thin-film polyolefin porous membrane is generally used
.
GB/T36363-2018 "Polyolefin separator for lithium ion battery" test standard requires lithium battery separator to have sufficient mechanical properties, including puncture strength, tensile strength, air permeability,
etc.
The smaller the value, the better the performance of the lithium battery
.
Today we will analyze the performance test requirements and test methods of lithium-ion battery separators in detail
.
1.
Air permeability is the time required for 100 mL of air to pass through a diaphragm with an area of 6.
45 cm2 under a pressure of 1.
21 kPa in a test temperature and humidity environment
.
PAPT-B01 Air Permeability Tester 2.
Thickness deviation: The uniformity of the thickness of the diaphragm includes the uniformity of the longitudinal thickness and the uniformity of the transverse thickness, but in comparison, the transverse thickness uniformity is more important, and generally must be controlled within 1um
.
PTT-03A Thickness Tester 3.
Tensile strength, elongation at break: This test is carried out in accordance with the provisions of GB/T1040.
3-2006, using a width of (15+0.
1) mm to obtain a type 2 sample, MTL (PC ) The initial distance between the clamps of the tensile testing machine is (100+5) mm, and the test speed is (250+10) mm/min
.
4.
4.
Puncture strength Flatten and clamp the lithium battery separator in the MTL (PC) tensile testing machine fixture, puncture at a rate of (100+10) mm/min, and take out the sample after completion, according to GB/T6672-2001.
It is stipulated that the thickness test of 4 points is carried out around the pinhole as shown in Figure 5, the average value is taken, and the puncture strength is calculated according to formula (8)
.
If there are unqualified items in the physical performance and electrical performance results of the ETT-AM tensile testing machine, the sampling should be doubled in the original batch, and the unqualified items should be re-inspected
.
