Module Compression Pad Mechanics under Non Linear Swelling Force Profiles
Non-linear swelling forces mandate hyperelastic compression pads that hold module interfacial pressure between 0.02 MPa and 0.60 MPa over full cell life.
ISO 3386
Meaning
International testing requirements define the methods for determining the compression stress-strain characteristics of flexible cellular polymeric materials. The iso 3386 standard provides the procedure for measuring the force required to compress a foam or rubber sample to a specific percentage of its original height. It characterizes the padding and thermal interface materials used in battery pack construction.
Testing Protocol
The standard specifies the dimensions of the test piece and the speed of the compression machine. It requires the sample to be compressed several times to a defined deflection before the final measurement is taken. This iso 3386 process ensures that the material is conditioned and the results are repeatable.
Material Selection
Engineers use the resulting stress-strain curves to select foams that will maintain pressure on battery cells as they expand. The data helps in calculating the mechanical loads within the housing. Following iso 3386 allows for a direct comparison of damping materials from different global suppliers.
Property Reporting
The results are usually reported as the compression stress at 25 or 50 percent strain. This value indicates how the material will behave under the expected clamping forces of the module. Compliance with iso 3386 is standard for materials used in automotive and industrial battery enclosures.