Solid-State Battery Lead-Out Structure for Bonding Reliability

A conductor layer is introduced as an intermediary between the current collector layer and the lead-out conductor member. This intermediate layer absorbs the stress from expansion and contraction during charging and discharging, preventing bonding disruption while maintaining electrical conductivity. The conductor layer acts as a buffer that mediates the mechanical stress between the rigid current collector and the lead-out conductor.

The battery structure uses composite material layers including the current collector layer, conductor layer, and lead-out conductor member. Each layer has specific material properties that work together: the current collector layer provides structural support, the conductor layer provides electrical conductivity and stress absorption, and the lead-out conductor member provides external electrical connection. This composite structure resolves the contradiction between simplicity and reliability.

The conductor layer serves as a stress-absorbing intermediary that becomes increasingly important in smaller battery designs. In compact batteries, the mechanical stress concentration is higher, and the conductor layer's ability to accommodate expansion and contraction prevents bonding failure while maintaining the reduced size and high energy density.

The conductor layer changes its physical parameters (such as thickness and material composition) to optimize both stress absorption and electrical conductivity. By adjusting these parameters, the design achieves high energy density through size reduction while maintaining bonding reliability through appropriate conductor layer specifications.