Battery Module Short-Circuit Unit for Overcharge Protection

The battery module's own physical expansion during overcharge directly triggers the safety mechanism through the short-circuit unit. The expanding battery cells push the short-circuit unit to contact the bus bar, creating an immediate physical response that eliminates the need for external sensors or control systems to detect and respond to the overcharge condition, significantly reducing response time.

The harmful expansion of the battery during overcharge is converted into a beneficial safety trigger. Instead of treating expansion merely as a symptom of overcharge to be detected, the invention uses the expansion itself as the activating force that pushes the short-circuit unit to create a protective short circuit, turning the harmful physical change into the mechanism for safety activation.

The invention combines multiple safety functions into a single integrated mechanism: the short-circuit unit simultaneously serves as both the detection element (sensing battery expansion) and the activation element (creating the short circuit). This unified design ensures that the same physical expansion that would trigger false alarms in separate detection systems instead directly activates the protective function, eliminating false positives while maintaining safety.

The short-circuit unit is designed with dynamic characteristics that allow it to respond only to sustained expansion beyond a threshold. The unit can accommodate normal expansion and contraction cycles without activating, but will trigger the short circuit when expansion persists and exceeds the safety threshold, providing both rapid safety response and operational continuity.