Overcharge protection systems for prismatic lithium ion battery cells with biased packaging

A prismatic lithium ion battery cell, comprising:

• a packaging that includes a cover sealed to a can;
• a power assembly disposed within the packaging, comprising:
• a coil stack with at least one coil;
• a first current collector coupled to a negative electrode of the at least one coil;
• a second current collector coupled to a positive electrode of the at least one coil;
• a first terminal post coupled to the first current collector that extends through the cover;
• and
• a second terminal post coupled to a second current collector and to the cover;
• and
• a first terminal pad coupled to the first terminal post and a second terminal pad coupled to the second terminal post, wherein the cover includes a spiral disk feature disposed below the first terminal pad, and includes a reversal disk disposed below the spiral disk feature, wherein the reversal disk is configured to deflect upwards and to displace the spiral disk feature to contact the first terminal pad in response to a pressure within the packaging being greater than a first predefined pressure threshold and form an external short-circuit between the positive and negative electrodes of the power assembly via the spiral disk feature, and wherein a portion of the power assembly fails in response to the external short-circuit and interrupts current flow within the power assembly.

A prismatic lithium ion battery cell, comprising:

• a packaging that includes a cover sealed to a can;
• a power assembly disposed within the packaging and comprising a positive side and a negative side, wherein the packaging is electrically coupled to the positive side of the power assembly;
• a terminal pad disposed above the cover of the packaging and electrically coupled to the negative side of the power assembly, wherein the cover includes:
• a spiral disk feature disposed below the terminal pad;
• a reversal disk sealed to the cover below the spiral disk feature, wherein, in response to a pressure within the packaging being greater than a first predefined pressure threshold, the reversal disk is configured to deflect upwards to displace the spiral disk feature to contact the terminal pad and form an external short-circuit between the positive and negative sides of the power assembly via the spiral disk feature;
• and
• a vent disk sealed to the cover and configured to activate to release effluent from an interior of the packaging at a second predefined pressure threshold, wherein the first predefined pressure threshold is substantially less than the second predefined pressure threshold.