摘要:
A circuit module includes: a thermally conductive board forming a part of a housing; a circuit board disposed above the thermally conductive board; a semiconductor chip connected to a plurality of electrode pads on a upper surface of the circuit board through solder; a heat sink connected to a upper surface of the semiconductor chip; a thermally conductive member thermally connecting the thermally conductive board to the semiconductor chip; and a plurality of fasteners passing through the thickness of the circuit board in an area surrounding the semiconductor chip to attach the heat sink to the thermally conductive board.
摘要:
A lithium-ion secondary battery which has a high reversible capacity and a high initial efficiency while effectively utilizing the excellent rate profile of carbon black, and a process of producing the same are disclosed. The negative electrode material includes composite particles including graphite powder particles, carbon black, and a pitch carbide, the composite particles having an average particle diameter D50 of 8 to 15 μm and a specific surface area of 15 m2/g or less. The process includes mixing 100 parts by weight of a mixed powder with 30 to 120 parts by weight of pitch from which free carbon has been removed or pitch having a quinoline insoluble content of less than 1%, the mixed powder being prepared by mixing graphite powder particles with carbon black in a weight ratio of 1:1.5 to 3.0, the graphite powder particles having an average particle diameter D50 of 3 to 10 μm and a standard deviation from the average particle diameter D50 of 0.2 μm or less, kneading the mixture, and carbonizing the kneaded product by firing at 1000° C. or more in a non-oxidizing atmosphere, or further graphitizing the kneaded product.
摘要:
A process is disclosed which produces a negative electrode material for lithium-ion secondary batteries that has a small irreversible capacity and a large reversible capacity by suppressing exposure of an active graphite surface due to grinding. The process includes melt-mixing graphite particles, pitch having a quinoline insoluble content of 0.3% or less and a fixed carbon content of 50% or more, and a fusible organic substance that volatilizes by 50% or more when heated to 400° C. in the air and has a residual carbon content of 3% or less when heated to 800° C. in an inert atmosphere, carbonizing the mixture by firing, graphitizing the carbonized product, and grinding the graphitized product. It is preferable that the graphite particles and the pitch be mixed in such a ratio that the amount of the pitch is 25 to 40 parts by weight based on 100 parts by weight of the graphite particles, and a formed product obtained by forming mixture be carbonized by firing, graphitized, and ground.
摘要:
A circuit module includes: a thermally conductive board forming a part of a housing; a circuit board disposed above the thermally conductive board; a semiconductor chip connected to a plurality of electrode pads on a upper surface of the circuit board through solder; a heat sink connected to a upper surface of the semiconductor chip; a thermally conductive member thermally connecting the thermally conductive board to the semiconductor chip; and a plurality of fasteners passing through the thickness of the circuit board in an area surrounding the semiconductor chip to attach the heat sink to the thermally conductive board.
摘要:
When a terminal that can be connected to the Internet directs an overseas remittance unit to remit funds from an account of a financial institution to an account of an overseas financial institution, the overseas remittance unit first, based on this remittance instruction, requests a funds withdrawal unit to withdraw funds from the account of the financial institution. The funds withdrawal unit, in accordance with the request from the overseas remittance unit, withdraws funds from the account of the financial institution and then notifies the overseas remittance unit of the withdrawal. The overseas remittance then requests a funds transfer unit to remit the withdrawn funds to the account of the overseas financial institution. The funds transfer unit, in accordance with the request from the overseas remittance unit, remits the funds that have been withdrawn from the funds withdrawal unit to the account of the overseas financial institution.
摘要:
A composite porous ceramic hollow fiber obtained by dipping a porous ceramic hollow fiber into a carbon precursor-forming solution, picking up and drying the dipped porous ceramic hollow fiber, heating the thus deposited carbon precursor-forming film, thereby obtaining a carbon precursor thin film, and heating the carbon precursor thin film at a carbon precursor thermal decomposition temperature, thereby forming a carbon thin film on the porous ceramic hollow fiber has a permeance about 100 to about 1,000 times as high as that of an organic thin film and a separation coefficient as high as that of the organic thin film.