Meaning
Structural and electrical decline of interconnects occurs over time due to the combined effects of environmental stress and operational usage. In battery systems, joint degradation typically involves the increase of contact resistance at the points where cells link to busbars. This process eventually leads to localized overheating and potential system failure.
Environmental Load
Thermal cycling during charge and discharge cycles causes the materials to expand and contract at different rates. Such physical movement accelerates joint degradation by weakening the metallurgical or mechanical bond between the conductor and the terminal. Moisture ingress can also trigger galvanic corrosion at these sites when different metals are in contact.
Repeated stress leads to micro-cracking that slowly reduces the effective area of the connection.
Signal Measurement
Monitoring the voltage drop across a connection reveals the current state of the interface. When joint degradation reaches a critical point, the internal management system may detect a voltage imbalance that triggers a safety shutdown. Regular inspection identifies these issues before they become catastrophic.
Operational Lifecycle
Heavy vibration in mobile applications like electric vehicles puts constant shear stress on every weld. Preventing joint degradation requires selecting compatible materials and applying protective coatings to the finished assembly. High quality interconnects maintain their integrity throughout the entire life of the energy storage unit.
