CPC G01N 15/04 (2013.01) [G01N 27/07 (2013.01); G01N 27/228 (2013.01); H01M 10/0525 (2013.01)] | 15 Claims |
1. A state determination apparatus comprising:
electrodes configured to apply an AC signal to a mixture, wherein the mixture is to be used as a positive electrode or a negative electrode, wherein the mixture includes a liquid and an insoluble solid matter mixed in the liquid;
a measurement unit configured to measure an impedance of the mixture for every frequency of the AC signal based on a response signal flowing through the mixture when the AC signal is applied to the mixture by the electrodes;
a setting unit configured to set an equivalent circuit corresponding to the mixture, wherein the equivalent circuit includes a series circuit that is obtained by serially connecting one or a plurality of first parallel circuit(s) based on element(s) corresponding to an internal resistance component of the solid matter and one or a plurality of second parallel circuit(s) based on element(s) corresponding to a contact resistance component between the solid matter;
a calculating unit configured to calculate a parameter of the first and second parallel circuits by executing an equivalent circuit analysis for approximating impedance of the equivalent circuit to the impedance of the mixture; and
a derivation unit configured to derive an index for specifying the state of the mixture based on the parameter of the first and second parallel circuits, wherein the index specifies a homogeneity of the mixture.
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