Page 11 - Guide to Lithium-ion Battery Solutions

Material Testing

Purpose Samples Purpose Samples

Puncture strength measurement of a separator Separator Evaluating the strain characteristics of Separator after puncture test
(Under environment of 25 °C, 60 °C, 90 °C) separators after puncture damage

Puncture
location

Mark

Data Data

Maximum Test Force /
Displacement for Each Temperature

Test Temperature Maximum Test Force Maximum
(°C) (N) Displacement (mm)
25 3.85 4.45
60 4.07 6.63

90 2.13 6.68

Test Force-Displacement Curve
Strain distribution under tensile load

Result

Comparing the results at 25 °C and 60 °C, we can see that the maximum test force is the same, but the maximum Result
displacement value is higher at 60 °C. Next, comparing the characteristic values at 60 °C and 90 °C, we can see that the
maximum test force decreases at 90 °C, but the maximum displacement is the same. From the above, it can be seen that
the lithium-ion battery separator used in this test has an increase in elongation characteristics but no decrease in strength We evaluated the strain characteristics of a separator after puncture to investigate how a damaged separator may act
at 60 °C. under stress.
DIC analysis is a method of comparing random patterns on the surface of an object before and after the object is
deformed to determine the amount of pattern movement and measure strain. Using the DIC analysis method, we can
visually see that the area around the damaged area in the center turns red where stress is concentrated and strain is the
largest.

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