公开(公告)号：US20230083009A1

公开(公告)日：2023-03-16

申请号：US17760075

申请日：2021-01-27

Applicant: FDK CORPORATION

Inventor： Kenji Hamada

IPC: H02J7/00 ,  H02J7/06 ,  H02H7/18

Abstract: A battery voltage equalization device 1 includes: a transformer T including a primary winding T1 into which the output voltage of a battery pack BP is inputted and a plurality of secondary windings T2 corresponding to each of batteries B; a conversion circuit 2 that converts an AC voltage outputted by the secondary windings T2 to a DC voltage; a cutoff circuit 3 provided to cut off a conductive pathway from the conversion circuit 2 to the batteries B; and a control unit 5 that controls the energization of the primary winding T1, wherein the cutoff circuit 3 includes a first switch SW1 and the second switch SW2 which are provided in series on the conductive pathway and which are opened or closed by the control unit, a first body diode Db1 and a second body diode Db2 of which the same terminals are connected to each other and which are respectively connected in parallel with the switches, and a surge suppression resistor Rss connected in parallel with the first body diode Db 1 or the second body diode Db2 for which the direction of charging current to the batteries B is the forward direction.

公开(公告)号：US20230049091A1

公开(公告)日：2023-02-16

申请号：US17813566

申请日：2022-07-19

Applicant: FDK CORPORATION

Inventor： Shohei Unoki ,  Takeshi Kajiwara ,  Minori Inoue ,  Takahiro Endo ,  Shigekazu Yasuoka ,  Yoshikatsu Watanabe

IPC: H01M4/48 ,  H01M4/62

Abstract: A battery includes: an electrode group including an air electrode and a negative electrode that are stacked with a separator interposed therebetween; and a container housing the electrode group together with an alkaline electrolyte liquid. The air electrode includes a catalyst for an air secondary battery, and this catalyst for an air secondary battery includes a pyrochlore bismuth-ruthenium composite oxide having a full width at half maximum of a diffraction peak corresponding to a (222) face obtained by a powder X-ray diffraction method using CuKα rays as X-rays, of 0.350 deg or larger and 0.713 deg or smaller.

公开(公告)号：US11495804B2

公开(公告)日：2022-11-08

申请号：US16781192

申请日：2020-02-04

Applicant: FDK CORPORATION ,  JAPAN METALS AND CHEMICALS CO., LTD.

Inventor： Shohei Unoki ,  Takeshi Kajiwara ,  Takahiro Endo ,  Shigekazu Yasuoka ,  Yoshikatsu Watanabe

IPC: H01M4/90 ,  H01M12/08 ,  H01M4/38 ,  H01M4/02 ,  H01M4/86

Abstract: An air electrode catalyst for an air secondary battery includes a pyrochlore-type composite oxide having two or more crystal structures having a different amount of oxygen. A battery, according to some embodiments, includes an electrode group including an air electrode and a negative electrode stacked with a separator therebetween, and a container accommodating the electrode group along with an alkali electrolyte solution, wherein the air electrode includes the air electrode catalyst. The air electrode catalyst may have a pyrochlore-type composite oxide having a crystal structure represented by Bi2Ru2O6.92 and a crystal structure represented by Bi2Ru2O7.33.

公开(公告)号：US11355751B2

公开(公告)日：2022-06-07

申请号：US16665891

申请日：2019-10-28

Applicant: FDK CORPORATION

Inventor： Takeshi Kajiwara ,  Shohei Unoki ,  Takahiro Endo

IPC: H01M4/505 ,  H01M4/24 ,  H01M4/525 ,  H01M12/08 ,  H01M4/38 ,  H01M4/86 ,  H01M4/90 ,  H01M4/02

Abstract: A battery includes an electrode group including an air electrode and a negative electrode stacked with a separator therebetween, and a battery case accommodating the electrode group along with an alkali electrolyte solution, wherein the air electrode includes an air electrode mixture containing a pyrochlore-type composite oxide and a manganese oxide, and the pyrochlore-type composite oxide is a bismuth-ruthenium oxide.

公开(公告)号：US20220123374A1

公开(公告)日：2022-04-21

申请号：US17310729

申请日：2020-02-19

Applicant: FDK CORPORATION

Inventor： Hiroyuki Shibaoka

IPC: H01M10/28 ,  H01M50/147 ,  H01M50/533 ,  H01M50/183 ,  H01M50/107 ,  H01M4/24

Abstract: A nickel hydrogen secondary battery includes an electrode group including a positive electrode and a negative electrode that face each other via a separator, an outer package can that has an opening at an upper end thereof, and accommodates the electrode group therein together with an electrolyte, a sealing body including a cover plate fitted in the opening of the outer package can, and a positive electrode cap which is electrically connected to an outer surface of the cover plate, a positive electrode lead, one end portion of which is electrically connected to an inner surface of the cover plate and the other end portion of which is electrically connected to the positive electrode, and an oxygen block layer that covers at least a range where the one end portion of the positive electrode lead and the inner surface of the cover plate overlap each other, and suppresses permeation of oxygen therethrough, and a thickness of a thinnest portion of the oxygen block layer is 3 μm or more.

公开(公告)号：US20220069285A1

公开(公告)日：2022-03-03

申请号：US17446285

申请日：2021-08-27

Applicant: FDK CORPORATION

Inventor： Shota Ohata ,  Jun Ishida ,  Yuki Ehara ,  Masaru Kihara

IPC: H01M4/134 ,  H01M10/054 ,  C22C19/03

Abstract: A nickel-metal hydride secondary battery includes an outer can and a group of electrodes housed in the outer can together with an alkaline electrolytic solution. The group of electrodes includes a positive electrode and a negative electrode that are superposed with a separator interposed therebetween, and the negative electrode includes a hydrogen absorbing alloy for nickel-metal hydride secondary batteries, the hydrogen absorbing alloy having a single composition and composed of a plurality of crystal phases.

公开(公告)号：US20210376617A1

公开(公告)日：2021-12-02

申请号：US17290772

申请日：2019-09-20

Applicant: FDK CORPORATION

Inventor： Kenji Kitamura ,  Yasunari Mizoguchi ,  Takashi Kanou

IPC: H02J7/00 ,  H01M10/48 ,  H01M10/44 ,  G01R31/3832 ,  G01R19/14

Abstract: A battery polarity determination circuit includes a battery accommodating unit including a first contact and a second contact to be in contact with respective electrode terminals of a battery, a control device that is connected via a resistor to a voltage lead-out point at which a voltage of the battery is led out and determines a polarity of the battery, a connection switching circuit capable of switching between a first connection state and a second connection state, and a diode having a cathode to be connected to a voltage read-in point at which the resistor and the control device are connected to each other, and an anode to be grounded, wherein the control device determines the polarity of the battery based on a voltage at the voltage read-in point according to the connection state of the connection switching circuit, and a forward voltage of the diode is set so that the voltage at the voltage read-in point is not less than a lower limit value of an absolute maximum rating of the control device.

公开(公告)号：US20210344069A1

公开(公告)日：2021-11-04

申请号：US17374993

申请日：2021-07-14

Applicant: FDK CORPORATION

Inventor： Tatsuya Yamazaki ,  Shigeyuki Kuniya

IPC: H01M50/183 ,  H01M6/02 ,  H01M50/152 ,  H01M50/171

Abstract: A sealing gasket used in a tubular battery includes a disc-shaped partition portion; an outer peripheral portion provided to stand from a peripheral edge of the partition portion and held between an open end of a metal battery can and a dish-shaped metal sealing plate; and a plurality of stress buffer portions formed of annular grooves formed concentrically in the partition portion, wherein the tubular battery includes the metal battery can having a bottomed tubular shape and has the open end subjected to inward diameter reduction, a power generation element housed in the battery can, the dish-shaped metal sealing plate fitted and attached to the open end subjected to the inward diameter reduction, and the sealing gasket made of resin and held between the open end and the sealing plate.

公开(公告)号：US20210257674A1

公开(公告)日：2021-08-19

申请号：US17158711

申请日：2021-01-26

Applicant: FDK CORPORATION

Inventor： Akira Saguchi

IPC: H01M10/28 ,  H01M4/04 ,  H01M50/107 ,  H01M10/04 ,  H01M50/131

Abstract: An alkaline storage battery includes a spiral electrode group in which a positive electrode plate, a negative electrode plate, and a separator arranged between the positive electrode plate and the negative electrode plate are laminated, the negative electrode plate is located on the inner peripheral side of the positive electrode plate at an innermost peripheral portion, and an electrically conductive outer packaging can in which the spiral electrode group is accommodated together with an alkaline electrolytic solution. The negative electrode plate includes a negative electrode core body, a first negative electrode mixture layer carried on a surface on the outer peripheral side of the negative electrode core body, and a second negative electrode mixture layer carried on a surface on the inner peripheral side of the negative electrode core body. The negative electrode core body has a burr protruding toward the outer peripheral side at an edge portion of an innermost peripheral portion of the negative electrode core body. The thickness of the edge portion of an innermost peripheral portion of the first negative electrode mixture layer is smaller than the thickness of a portion other than the edge portion of the first negative electrode mixture layer. The height of the burr is 30% or less of the thickness of the separator.

公开(公告)号：US11043664B2

公开(公告)日：2021-06-22

申请号：US16383048

申请日：2019-04-12

Applicant: FDK CORPORATION

Inventor： Toshiki Sato ,  Jun Ishida ,  Akira Saguchi ,  Shota Ohata

IPC: H01M4/24 ,  H01M4/36 ,  H01M4/62 ,  H01M4/38 ,  H01M10/28 ,  H01M4/02

Abstract: A battery comprises an electrode group including a separator, a positive electrode and a negative electrode. The negative electrode comprises a negative electrode core, negative electrode mixture layers retained to the negative electrode core, and a fluorine resin layer disposed on the surface of the negative electrode mixture layers. The negative electrode mixture layers include a first outermost peripheral region located at the outermost periphery of the electrode group and a second outermost peripheral region located opposite to the first outermost peripheral region. When the amount of the fluorine resin constituting a first fluorine resin layer in a portion of the first outermost peripheral region is represented by A, and the amount of the fluorine resin constituting a second fluorine resin layer in a portion of the second outermost peripheral region is represented by B, a relation A>B is satisfied.