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Pat. 9897663 United States, Int. Cl.22 G01N 27/416, G01R 31/00, G01R 31/36, H01M 8/04537, H01M 10/42, H01M 10/48, H02M 3/00. Integrated DC/DC converter, electrochemical energy storage system, and methods for analyzing electrochemical impedance spectroscopy and working state of electrochemical energy storage apparatus : Appl. N 14/973905 : Filed 18.12.2015 : Pub. 20.02.2018 : / Po Hong, Jian-Qiu Li, Liang-Fei Xu, Ming-Gao Ouyang ; Assignee Tsinghua University ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9897663/en?oq=US9897663.html (дата обращения: ДД.ММ.ГГГГ).