Solid State Module Spring Plate Compression Allowances under Cycling
Solid state spring plate allowances absorb 10 to 18 percent cell volumetric strain while bounding contact pressure between 1.0 and 4.0 MPa across cell life.
Void Formation Resistance
Meaning
Durability against internal cavity creation in adhesive layers or active materials prevents localized mechanical or thermal failures. A high void formation resistance ensures that underfill compounds and electrode slurries remain continuous and free of air pockets during curing and operation.
Material Continuity
Air gaps or voids within the adhesive layers of a battery pack act as thermal insulators that block heat dissipation. Choosing a material with high void formation resistance prevents these microscopic gaps from appearing during the dispensing and curing processes. This continuity is essential for maintaining uniform temperatures across all cells in a module.
Without this property, hotspots can develop and cause uneven cell degradation.
Interfacial Performance
Under high physical pressures, materials that lack sufficient cohesion will separate internally and form pockets. This failure mode reduces the mechanical strength of the bonded joints and lowers the overall rigidity of the battery pack. Evaluating void formation resistance involves testing the adhesive under cyclic thermal and mechanical stresses.
This test mimics the conditions the pack will experience over years of road vibrations and temperature swings.
Manufacturing Control
Maintaining tight control over the deposition speed and temperature of adhesives helps maximize this resistance property during factory assembly. Using automated dispensing nozzles prevents the entrapment of air during the application of high-viscosity thermal pastes. In addition, applying vacuum curing steps further enhances the void formation resistance of critical joints.
These manufacturing procedures are regularly audited to ensure that the thermal and structural performance of every shipped pack meets the required quality and durability specifications.