Battery pack and treatment system

A battery pack for supplying an electrically driven treatment apparatus with an electric driving power, the battery pack comprising:

• a first stack limiting structure and a second stack limiting structure, wherein the second stack limiting structure is disposed opposite and with a fixed distance to the first stack limiting structure;
• a plurality of pouch cells, wherein the pouch cells are disposed in a stack, wherein the stack is disposed between the first stack limiting structure and the second stack limiting structure and a height of the stack in a stack direction is limited by the first stack limiting structure and the second stack limiting structure;
• and
• a sensor arrangement, wherein the sensor arrangement is disposed in the stack, wherein the sensor arrangement extends with a constant thickness across a major part of a surface of the pouch cells and is configured such that the height of the stack across the sensor arrangement is approximately equal, and wherein the sensor arrangement has a pressure sensor, wherein the pressure sensor is configured for detecting a pressure force acting in the stack direction on the pouch cells, and wherein the major part of the surface is at least 70% of the surface,
• wherein
• the sensor arrangement has a compensation spacer,
• the compensation spacer is disposed in the stack,
• the compensation spacer is separate from the pressure sensor, and
• the compensation spacer has a sensor recess, wherein the pressure sensor is disposed in the sensor recess, wherein a spacer thickness of the compensation spacer and a sensor thickness of the pressure sensor in the stack direction are approximately equal.