Magnetic force dilatometer with temperature compensation

A dilatometer for measuring dilation in a coin cell battery comprising:

• a coin cell holder configured to hold the coin cell battery;
• a magnet arranged adjacent to the coin cell holder and spaced from the coin cell battery seated in the coin cell holder;
• a force sensor configured to measure magnetic force strength between the magnet and a magnetic spacer arranged in the coin cell battery;
• a sensor configured to measure one of temperature and strain of a component of the dilatometer;
• a translation stage configured to support the force sensor;
• and
• a controller configured to measure dilation of the coin cell battery based on change in the magnetic force strength measured by the force sensor between the magnet and the magnetic spacer and to compensate the dilation based on the one of the temperature and the strain.

A dilatometer for measuring dilation in a coin cell battery, the dilatometer comprising:

• a housing of the coin cell battery;
• a first electrode within the housing;
• a second electrode within the housing;
• a separator in the housing between the first electrode and the second electrode;
• a magnetic spacer within the housing adjacent to the second electrode;
• a biasing member arranged in the housing between the magnetic spacer and an inner surface of the housing and configured to hold the magnetic spacer against the second electrode;
• an external magnet arranged outside of the housing and spaced from the housing;
• a first sensor configured to measure magnetic force strength between the external magnet and the magnetic spacer;
• a second sensor configured to sense one of temperature and strain of a component of the dilatometer;
• and
• a controller configured to measure dilation of the coin cell battery based on change in the magnetic force strength measured by the first sensor between the external magnet and the magnetic spacer and to compensate the dilation based on the one of the temperature and strain.