Patents by Inventor Rajshekar Das Gupta

Rajshekar Das Gupta has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220302438
    Abstract: The present disclosure relates generally to an electrode produced with a non-toxic solvent, resulting in a homogeneous mixture with uniform distributions of a conductive additive and a binder. Electrodes produced according to the present disclosure feature narrow binder particle size distribution, which distinguishes such electrodes from typical electrodes produced via a N-Methyl-Pyrrolidone (NMP) process. The resulting microstructure promotes the flow of current through the electrode and has an improved cycling stability due, in part, to the binder's and the conductive additive's ability to bind with the active material particles used in the fabrication of the electrode.
    Type: Application
    Filed: June 7, 2022
    Publication date: September 22, 2022
    Inventors: Rajshekar DAS GUPTA, Elmira MEMARZADEH, Sankar DAS GUPTA, Bjorn Haugseter, Tom Henriksen, Lars Ole Valøen, Akhilesh Kumar Srivastava
  • Patent number: 11355744
    Abstract: The present disclosure relates generally to an electrode produced with a non-toxic solvent, resulting in a homogeneous mixture with uniform distributions of a conductive additive and a binder. Electrodes produced according to the present disclosure feature narrow binder particle size distribution, which distinguishes such electrodes from typical electrodes produced via a N-Methyl-Pyrrolidone (NMP) process. The resulting microstructure promotes the flow of current through the electrode and has an improved cycling stability due, in part, to the binder's and the conductive additive's ability to bind with the active material particles used in the fabrication of the electrode.
    Type: Grant
    Filed: February 28, 2019
    Date of Patent: June 7, 2022
    Assignee: ELECTROVAYA INC.
    Inventors: Rajshekar Das Gupta, Elmira Memarzadeh, Sankar Das Gupta, Bjorn Haugseter, Tom Henriksen, Lars Ole Valøen, Akhilesh Kumar Srivastava
  • Patent number: 10797277
    Abstract: A double-sealed thin film electrochemical pouch cell, comprising a cathode current collector, a cathode, an electrolyte, an anode, and an anode current collector, which is double-sealed by a first inner laminate layer forming a primary seal covered by a second outer polymer layer forming a secondary seal The second outer polymer layer comprises embedded particles to increase the thermal conductivity of the second outer polymer layer.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: October 6, 2020
    Assignee: ELECTROVAYA INC.
    Inventors: Rakesh Bhola, Rajshekar Das Gupta, Sankar Das Gupta
  • Publication number: 20190267616
    Abstract: The present disclosure relates generally to an electrode produced with a non-toxic solvent, resulting in a homogeneous mixture with uniform distributions of a conductive additive and a binder. Electrodes produced according to the present disclosure feature narrow binder particle size distribution, which distinguishes such electrodes from typical electrodes produced via a N-Methyl-Pyrrolidone (NMP) process. The resulting microstructure promotes the flow of current through the electrode and has an improved cycling stability due, in part, to the binder's and the conductive additive's ability to bind with the active material particles used in the fabrication of the electrode.
    Type: Application
    Filed: February 28, 2019
    Publication date: August 29, 2019
    Inventors: Rajshekar DAS GUPTA, Elmira MEMARZADEH, Sankar DAS GUPTA, Bjorn Haugseter, Tom Henriksen, Lars Ole Valøen, Akhilesh Kumar Srivastava
  • Patent number: 10033072
    Abstract: A battery module for receiving battery cells provides cooling through a cooling fluid. Chilled fluid travels first to the hottest part of the battery module and then continues to gradually less hot areas. As the chilled cooling fluid absorbs heat and travels to cooler parts of the battery module, the heat transfer between the fluid and the battery cells decreases because the temperature differential between the cells and cooling fluid decreases, providing a more even temperature distribution across the battery module. The cooling fluid may be contained in a conduit associated with one or more cooling plates. A plurality of slots provide a precise mechanical support for each battery cell, increasing the heat conduction from the cell to the battery module, protecting the battery module from vibration and decreasing contamination in case of thermal runaway or other damage to the cells.
    Type: Grant
    Filed: January 7, 2013
    Date of Patent: July 24, 2018
    Assignee: ELECTROVAYA INC.
    Inventors: Rakesh Bhola, Rajshekar Das Gupta
  • Publication number: 20180114956
    Abstract: A double-sealed thin film electrochemical pouch cell, comprising a cathode current collector, a cathode, an electrolyte, an anode, and an anode current collector, which is double-sealed by a first inner laminate layer forming a primary seal covered by a second outer polymer layer forming a secondary seal The second outer polymer layer comprises embedded particles to increase the thermal conductivity of the second outer polymer layer.
    Type: Application
    Filed: November 17, 2017
    Publication date: April 26, 2018
    Inventors: Rakesh BHOLA, Rajshekar DAS GUPTA, Sankar DAS GUPTA
  • Patent number: 9853254
    Abstract: A double-sealed thin film electrochemical pouch cell, comprising a cathode current collector, a cathode, an electrolyte, an anode, and an anode current collector, which is double-sealed by a first inner laminate layer forming a primary seal covered by a second outer polymer layer forming a secondary seal. The second outer polymer layer comprises embedded particles to increase the thermal conductivity of the second outer polymer layer.
    Type: Grant
    Filed: January 7, 2013
    Date of Patent: December 26, 2017
    Assignee: ELECTROVAYA INC.
    Inventors: Rakesh Bhola, Rajshekar Das Gupta, Sankar Das Gupta
  • Publication number: 20140363721
    Abstract: A double-sealed thin film electrochemical pouch cell, comprising a cathode current collector, a cathode, an electrolyte, an anode, and an anode current collector, which is double-sealed by a first inner laminate layer forming a primary seal covered by a second outer polymer layer forming a secondary seal. The second outer polymer layer comprises embedded particles to increase the thermal conductivity of the second outer polymer layer.
    Type: Application
    Filed: January 7, 2013
    Publication date: December 11, 2014
    Applicant: ELECTROVAYA INC.
    Inventors: Rakesh Bhola, Rajshekar Das Gupta, Sankar Das Gupta
  • Publication number: 20140342195
    Abstract: A battery module for receiving battery cells provides cooling through a cooling fluid. Chilled fluid travels first to the hottest part of the battery module and then continues to gradually less hot areas. As the chilled cooling fluid absorbs heat and travels to cooler parts of the battery module, the heat transfer between the fluid and the battery cells decreases because the temperature differential between the cells and cooling fluid decreases, providing a more even temperature distribution across the battery module. The cooling fluid may be contained in a conduit associated with one or more cooling plates. A plurality of slots provide a precise mechanical support for each battery cell, increasing the heat conduction from the cell to the battery module, protecting the battery module from vibration and decreasing contamination in case of thermal runaway or other damage to the cells.
    Type: Application
    Filed: January 7, 2013
    Publication date: November 20, 2014
    Inventors: Rakesh Bhola, Rajshekar Das Gupta