Patents by Inventor Dewen Liu

Dewen Liu 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).

  • Patent number: 11971455
    Abstract: A mixed chemistry battery is provided. The mixed chemistry battery includes a reference module having a first chemistry and a battery module having a second chemistry that is different that the first chemistry, the battery module is connected to the reference module in series. The mixed chemistry battery also includes a battery monitoring system configured to monitor an open circuit voltage of the reference module, an open circuit voltage of the battery module, and a current flow through the reference module and the battery module. The battery monitoring system is further configured to calculate a state-of-charge (SOC) and state-of-health (SOH) of the battery module based at least in part on a SOC of the reference module.
    Type: Grant
    Filed: July 6, 2022
    Date of Patent: April 30, 2024
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Chengwu Duan, Jian Yao, Dewen Kong, Jingyuan Liu
  • Publication number: 20240113300
    Abstract: The present disclosure provides a modified binder for use in an electrochemical cell that cycles lithium ions. The modified binder includes one or more agglomerates of polytetrafluoroethylene nanoparticles, where each of the polytetrafluoroethylene nanoparticles includes a polytetrafluoroethylene core and a polymeric shell that is disposed on exposed surfaces of the core. The polymeric shell can include a polymer selected from the group consisting of: polyethylene oxide, polyglycidyl methacrylate, polyvinylidene difluoride, fluoride-hexafluoropropylene, polypropylene oxide, polyacrylonitrile, polymethacrylonitrile, polymethyl methacrylate, derivatives and co-polymers, and combinations thereof, and in certain instances, also a humidity tolerant lithium salt.
    Type: Application
    Filed: November 28, 2022
    Publication date: April 4, 2024
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Yong LU, Meiyuan WU, Dewen KONG, Haijing LIU
  • Publication number: 20240100991
    Abstract: A battery system for a vehicle includes: first and second positive terminals and a negative terminal; switches; at least three strings of battery cells, each of the strings configured to, at different times be: connected to the first positive terminal via first ones of the switches; connected to the second positive terminal via second ones of the switches; and disconnected from both of the first and second positive terminals; and a switch control module configured to: identify one of a short circuit and an over voltage condition in a first voltage bus; when the one of the short circuit and the over voltage condition is identified, identify N of the strings of battery cells with the N lowest state of health values; and control switching of the switches and connect the identified N strings of battery cells to the first voltage bus.
    Type: Application
    Filed: July 10, 2023
    Publication date: March 28, 2024
    Inventors: Aaron B. Bloom, Dave G. Rich, Dewen Kong, Jingyuan Liu, Wing-Fai Ha
  • Publication number: 20240100955
    Abstract: A low-voltage mitigation and recovery system includes: an auxiliary power module that converts an output voltage of a power source of a vehicle to a charging voltage, the power source provides power to power a propulsion system of the vehicle; a contactor that supplies power from the power source to the auxiliary power module; a first control module that controls states of the auxiliary power module and the contactor. A second control module is integrated within a MODACS, monitors parameters of blocks of cells of the MODACS, and, based on at least one of the parameters: configures a switch network of the MODACS to disconnect a first set of blocks of the MODACS from loads and to connect or maintain connection of a second set of blocks of the MODACS to selected ones of the loads; and wakes up the first control module to jump start and recover the MODACS.
    Type: Application
    Filed: July 11, 2023
    Publication date: March 28, 2024
    Inventors: Aaron B. BLOOM, Dave G. Rich, Dewen Kong, Jingyuan Liu, Wing-Fai Ha
  • Patent number: 11936030
    Abstract: A method of manufacturing an electrode for an electrochemical cell includes providing an admixture including an electroactive material, a binder, and a solvent. The method further includes rolling the admixture to form a sheet and forming a multi-layer stack from the sheet. The method further includes forming an electrode film precursor by performing a plurality of sequential rollings, each including rolling the stack through a first gap. The plurality of sequential rollings includes first and second rollings. In the first rolling, the stack is in a first orientation. In the second rolling, the stack is in a second orientation different from the first orientation. The method further includes forming an electrode film by rolling the electrode film precursor through a second gap less than or equal to the first gap. The method further includes drying the electrode film to remove at least a portion of the solvent.
    Type: Grant
    Filed: December 1, 2021
    Date of Patent: March 19, 2024
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Dewen Kong, Xiaochao Que, Meiyuan Wu, Haijing Liu, Xiaosong Huang, Mark W. Verbrugge
  • Patent number: 11926049
    Abstract: A nuclear emergency multifunctional operation robot includes a base, a mechanical arm, a tool change-over device, and motion supporting devices. The base includes a pedestal, a mounting seat A, a mounting seat B, a mounting seat C, a rotation driving mechanism A, and a rotation driving mechanism B. The front end of the mechanical arm is connected to the mounting seat B; the tool change-over device includes a male connector and a female connector which are abutted with or separated from each other; and the motion supporting devices are used to drive the nuclear emergency multifunctional operation robot to move. The present disclosure has the advantages that the base can be integrated with various end tools, so that the operation robot conveniently changes over tools according to operation needs to conduct various types of operations.
    Type: Grant
    Filed: September 8, 2021
    Date of Patent: March 12, 2024
    Assignee: University of South China
    Inventors: Dewen Tang, Shuliang Zou, Wei Wang, Weiwei Xiao, De Zhang, Jun Liu, Qian Deng
  • Publication number: 20240079544
    Abstract: A method for fabricating a dual-layer capacitive cabode electrode includes fabricating a first film including capacitive active material; fabricating a second film including cathode active material; hot jointing the first film and the second film to create a cabode film; and laminating the cabode film onto opposite sides of a current collector using conductive adhesive.
    Type: Application
    Filed: October 7, 2022
    Publication date: March 7, 2024
    Inventors: Dewen KONG, Meiyuan WU, Yong LU, Haijing LIU, Mark W. VERBRUGGE
  • Publication number: 20130306823
    Abstract: A device is selectably movable between a “clasp” configuration and a “hanger” configuration. The device has a device body, a first spring biased hinge at a first end of the device body and a second spring biased hinge at a second end of the device body, a clip hingedly connected to the first end of the body, and a hook hingedly connected to the second end of the body. The hinges bias the device to a closed position clasp configuration and the clip and the hook are swingable against spring bias to an open position hanger configuration. The device has physical stops to limit angular motion of both clip and hook to less than 90 degrees each.
    Type: Application
    Filed: July 23, 2013
    Publication date: November 21, 2013
    Inventor: Dewen Liu
  • Publication number: 20130037678
    Abstract: This utility model discloses a shaft device used for a bag hanging device and a bag hanging device that uses said shaft device. Said shaft device comprises a shaft sleeve, a shaft, a cam, a pressure wheel, and a helical compression spring. One end of the shaft sleeve is a closed end with a through hole at the center thereof, and the other end is an open end. The cam is situated at the open end of the shaft sleeve. A catching disc provided on one end of the shaft is held in the catching groove at the outer end of the cam, and the shaft successively passes through the cam and the pressure wheel and helical compression spring that are inside the shaft sleeve. The concave groove at the other end of the shaft projects out of the closed end of the shaft sleeve, and there is a catching button in said concave groove.
    Type: Application
    Filed: November 18, 2011
    Publication date: February 14, 2013
    Inventor: Dewen Liu