Cylindrical Battery Venting Structure for Thermal Runaway Relief

The cover plate is designed with non-uniform thickness, featuring a thicker first region surrounding the winding center hole and a thinner second region at the periphery. This local quality variation allows the first region to maintain structural strength while the thinner second region facilitates easier deformation and venting during thermal runaway events.

The solution transitions from a two-dimensional area constraint to a three-dimensional volume solution by varying the thickness of the cover plate in different regions. The explosion-proof valve region utilizes the thickness variation to achieve adequate venting capacity without compromising the overall cover plate area available for sealing and structural support.

The cover plate design utilizes parameter changes in thickness (from thicker first region to thinner second region) to optimize venting performance. This parameter variation can be achieved through standard metal forming processes such as stamping or rolling, which create the thickness gradient in a single manufacturing step, thereby maintaining manufacturing simplicity while improving venting performance.