Heat exhanger and battery system including same

A battery system comprising:

• at least one battery cell;
• and
• a heat exchanger comprising a plurality of channels extending generally along a first direction and arranged along an orthogonal second direction, wherein a polymeric sheet extending along the first and second directions comprises at least a portion of a major surface of the plurality of channels, a major surface of the heat exchanger in thermal contact with a major surface of the at least one battery cell, wherein the battery system provides fluid flow through the plurality of channels such that a temperature of a first battery cell in the at least one battery cell increasing above a predetermined temperature results in a rupturing of the plurality of channels, the rupturing of the plurality of channels increasing a rate of heat extraction from the first battery cell.

A heat exchanger comprising a plurality of channels for transporting fluid, the plurality of channels extending generally along a first direction and arranged along an orthogonal second direction, each channel in the plurality of channels having a major surface disposed to contact the fluid, wherein a polymeric sheet extending along the first and second directions comprises at least a portion of the major surface of each channel in the plurality of channels, the polymeric sheet comprising at least one feature such that the plurality of channels is configured to rupture at, or proximate to, the at least one feature upon the heat exchanger satisfying a predetermined condition.