Battery assembly for medical device

An implantable medical device (IMD) comprising:

• an outer housing;
• processing circuitry;
• and
• a battery assembly within the outer housing, the battery assembly comprising:
• a battery housing;
• an electrode stack comprising a plurality of electrode plates disposed inside the housing;
• and
• an intermediate member configured to align the electrode stack at a fixed position within the housing, the intermediate member comprising:
• a plurality of side walls;
• and
• at least one protrusion disposed on an exterior surface of the side walls, wherein the at least one protrusion is in thermal contact with an interior surface of the housing;
• wherein the processing circuitry is configured to control delivery of electrical therapy from the IMD to a patient using power supplied by the battery assembly.