公开(公告)号：US20240255201A1

公开(公告)日：2024-08-01

申请号：US17789312

申请日：2021-08-19

Applicant: NEC Corporation

Inventor： Takashi OHTSUKA ,  Koichi Todoroki ,  Yoshinori Miyamoto ,  Masaki Chiba ,  Mahiro Hachiya ,  Minoru Yoshikawa

IPC: F25B49/02 ,  F25B13/00

CPC classification number: F25B49/02 ,  F25B13/00 ,  F25B2700/1933

Abstract: An object of the present invention is to prevent cavitation in a refrigerant pump from occurring due to a decrease in a net positive suction head in a cooling device.
A cooling device of the present invention is a cooling device using a refrigeration cycle in which a refrigerant is circulated through a heat receiver (1), a compressor (2), a heat radiator (3), and an expander (4), and includes a tank (5) that separates the refrigerant supplied from the expander (4) into a gas phase refrigerant and a liquid phase refrigerant, a pump (6) that sends the liquid phase refrigerant separated in the tank (5) to the heat receiver (1), and a control unit (7) that controls the amount of increase in pressure of the compressor 2 in the refrigeration cycle, and the control unit (7) increases the pressure of the compressor (2) in a limited range in which the value of the net positive suction head of the pump (6) does not fall below a predetermined value.

公开(公告)号：US20190051928A1

公开(公告)日：2019-02-14

申请号：US16079676

申请日：2017-02-22

Applicant: NEC Corporation

Inventor： Daisuke KAWASAKI ,  Takashi OHTSUKA ,  Suguru TAMAI ,  Noboru YOSHIDA ,  Shinya SUDO

IPC: H01M10/0525 ,  H01M10/0566 ,  H01M4/583 ,  H01M4/62 ,  H01M4/38 ,  H01M10/058

Abstract: A negative electrode active material constituting a lithium ion secondary battery having high energy density and excellent cycle characteristics, and a negative electrode and a lithium ion secondary battery comprising the same are provided. The present invention relates to a negative electrode active material comprising graphite particles and crystalline silicon particles, wherein a median diameter of the crystalline silicon particles is 0.7 μm or less, and a weight ratio of the crystalline silicon particles to the total weight of the graphite particles and the crystalline silicon particles is 1 wt % or more and 25 wt % or less.

公开(公告)号：US20210057721A1

公开(公告)日：2021-02-25

申请号：US16767286

申请日：2018-11-21

Applicant: NEC CORPORATION

Inventor： Daisuke KAWASAKI ,  Takashi OHTSUKA ,  Kazuhiko INOUE

IPC: H01M4/134 ,  H01M10/0525 ,  H01M4/525 ,  H01M4/38 ,  H01M4/66 ,  H01M4/62 ,  H01M10/0569 ,  H01M10/0567

Abstract: Provided is a lithium ion secondary battery having high energy density and excellent cycle characteristics, and hardly causing burning. The present invention relates to a lithium ion secondary battery comprising an electrode mixture layer comprising an electrode active material comprising Si alloy having a median diameter of 1.2 μm or less and 12% by weight or more and 50% by weight or less of an electrode binder; and an electrolyte solution comprising 60% by volume or more and 99% by volume or less of a phosphoric acid ester compound, 0% by volume or more and 30% by volume or less of a fluorinated ether compound, and 1% by volume or more and 35% by volume or less of a fluorinated carbonate compound, wherein the total amount of the phosphoric acid ester compound and the fluorinated ether compound is 65% by volume or more.

公开(公告)号：US20230213253A1

公开(公告)日：2023-07-06

申请号：US17788888

申请日：2021-09-13

Applicant: NEC Corporation

Inventor： Takashi OHTSUKA ,  Koichi Todoroki ,  Yoshinori Miyamoto ,  Masaki Chiba ,  Mahiro Hachiya ,  Minoru Yoshikawa

IPC: F25B49/02 ,  F25B43/00

CPC classification number: F25B49/02 ,  F25B43/006 ,  F25B2600/13 ,  F25B2700/2109 ,  F25B2700/19 ,  F25B2600/2501 ,  F25B2400/23

Abstract: A cooling device using a refrigeration cycle in which a refrigerant is circulated through a heat receiver, a compressor, a heat radiator, and an expansion valve includes: a gas-liquid separator configured to perform gas-liquid separation on the refrigerant supplied from the expansion valve; a pump configured to send a liquid phase refrigerant separated by the gas-liquid separator to the heat receiver; and a control unit configured to control opening and closing of a refrigerant flow path of the refrigeration cycle, and an operation and stop of the compressor and the pump, wherein the control unit starts the operation of the pump on condition that a net positive suction head of the pump has reached a predetermined value or more.

公开(公告)号：US20220151113A1

公开(公告)日：2022-05-12

申请号：US17440315

申请日：2020-02-14

Applicant: NEC Corporation

Inventor： Mahiro HACHIYA ,  Minoru YOSHIKAWA ,  Takashi OHTSUKA ,  Nobuo KANEKO

IPC: H05K7/20 ,  H05K7/14

Abstract: To efficiently cool down heat of a heating element 20, this electronic device 100 is provided with a circuit board 10 having a heating element 20 that is attached to a first main surface 11 thereof, a case 30 having an opening part 31 that is formed in a surface facing the heating element 20 and housing a refrigerant COO therein, and a connection part 40 connecting the opening part 31 and the heating element 20 so as to enclose the refrigerant COO, the connecting part has a thickness of at most 0.21 mm.