Impurity detection support device and impurity detection support method

A circulation device for circulating an electrode slurry for coating a coated body of a battery, the electrode slurry being under test, the circulation device comprising:

• an impurity detection support device,
• wherein the impurity detection support device includes:
• a pipe in which the electrode slurry under test flows, the electrode slurry containing a solvent and at least one of an electrode active material or a conductive additive;
• a first electrode and a second electrode arranged in the pipe such that an AC voltage is adapted to be applied to or an AC current is adapted to be superimposed on the electrode slurry under test in a space extending between a first position of the pipe and a second position shifted from the first position in a direction of extension of the pipe;
• a power supply unit that applies an AC voltage or superimposes an AC current between the first electrode and the second electrode;
• a measurement unit that measures a current generated between the first electrode and the second electrode due to application of the AC voltage or measures a voltage generated between the first electrode and the second electrode due to superposition of the AC current;
• and
• a calculation unit that calculates a resistance of the electrode slurry under test using a measurement result of the measurement unit, the resistance being an indicator for determining whether or not the electrode slurry under test contains conductive impurities.

A transport device for transporting an electrode slurry for coating a coated body of a battery, the electrode slurry being under test, the transport device comprising:

• an impurity detection support device,
• wherein the impurity detection support device includes:
• a pipe in which the electrode slurry under test flows, the electrode slurry containing a solvent and at least one of an electrode active material or a conductive additive;
• a first electrode and a second electrode arranged in the pipe such that an AC voltage is adapted to be applied to or an AC current is adapted to be superimposed on the liquid electrode slurry under test in a space extending between a first position of the pipe and a second position shifted from the first position in a direction of extension of the pipe;
• a power supply unit that applies an AC voltage or superimposes an AC current between the first electrode and the second electrode;
• a measurement unit that measures a current generated between the first electrode and the second electrode due to application of the AC voltage or measures a voltage generated between the first electrode and the second electrode due to superposition of the AC current;
• and
• a calculation unit that calculates a resistance of the electrode slurry under test using a measurement result of the measurement unit, the resistance being an indicator for determining whether or not the electrode slurry under test contains conductive impurities.