949 results about "Electrical conduction" patented technology

The present invention relates to the technical field of electrical connectors, and in particular to an anti-loosening electrical connector for electromechanical equipment, comprising a coaxially plugged core barrel and a piercing barrel, wherein a plurality of cables are clamped on the core barrel, and the ends of the plurality of cables extend along the radial direction of the core barrel and are evenly distributed around the circumference of the core barrel, and the piercing barrel is provided with a plurality of piercing pieces, one end of the piercing piece is provided with a clamping groove, and the interior of the clamping groove is provided with a cutting section, a pressing section and a conductive section in sequence from bottom to top, the cutting section is used for cutting the insulating sheath of the cable, the pressing section is used for clamping the insulating sheath of the cable, and the conductive section is used for conductive connection with the wire core of the cable, and a clamping ring is rotatably provided on the piercing piece, and the clamping ring is U-shaped; in the initial state, the center line of the clamping ring coincides with the center line of the clamping groove, and the clamping ring can be clamped with the insulating sheath of the cable; the clamping ring can be rotated 90°, so that the insulating sheath is in closer contact with the wire core.

The invention discloses injectable hydrogel with redox activity and electroactivity as well as a preparation method and application of the injectable hydrogel, and belongs to the technical field of medical materials. The preparation method comprises the following steps: reacting methacrylic anhydride and polysaccharide molecules in a solvent to prepare a double-bond functional polymer; the preparation method comprises the following steps: firstly, pre-polymerizing dopamine in a solvent, and then adding MOF (Metal Organic Framework) to carry out polymerization reaction, so as to prepare dopamine modified MOF; reacting the dopamine modified MOF, EDOT and ferric salt in a solvent, and collecting the precipitate to prepare a nano filler; the preparation method comprises the following steps: jointly dispersing the double-bond functional polymer, active polypeptide, a photoinitiator and nano filler into a solvent, and carrying out photocuring cross-linking. The preparation condition is mild, gel forming is rapid, the method is simple, the prepared hydrogel has injectable performance and conductive performance, catalytic activity of natural enzyme can be simulated, active oxygen removal can be achieved in the early stage of myocardial ischemia, electrical conduction of infarction parts can be enhanced, and effective recovery of cardiac functions can be achieved.

A back-contact battery and a manufacturing method therefor, which relate to the technical field of photovoltaics, and are used for reducing the number of defects on a second surface side and improving the photoelectric conversion efficiency of the back-contact battery. The back-contact battery comprises: a semiconductor substrate, a first doped semiconductor layer, an intrinsic semiconductor layer and a second doped semiconductor layer. The first doped semiconductor layer comprises a first doped part and a second doped part, wherein the first doped part is located on a first region, and the second doped part is located on an isolation region; and the doping concentration of impurities in the second doped part is lower than that of impurities in the first doped part. The intrinsic semiconductor layer is formed on the part of the isolation region outside the second doped part in a direction parallel to a second surface. The second doped semiconductor layer covers a second region, the electrical conduction type of the second doped semiconductor layer is opposite to the electrical conduction type of the first doped semiconductor layer, and the intrinsic semiconductor layer is used for electrically isolating the first doped semiconductor layer from the second doped semiconductor layer.

A control apparatus for a power tool containing at least one circuit board, a heat-conducting element, a cooling device for cooling the at least one circuit board, and at least one housing element, wherein, in a mounted state of the control apparatus, the circuit board and the heat-conducting element are arranged between the cooling device and the housing element, and wherein the heat-conducting element is positioned between the circuit board and the cooling device. A preload device is contained between the housing element and the at least one circuit board in order to press the circuit board against the heat-conducting element in a predefined direction.

Disclosed herein are ultrasound transducers that are selectively insulated to thereby enable the transducers to be exposed to an electrically conductive fluid without causing a short circuit between electrodes of the transducers. Such a transducer includes a piezoelectric transducer body having a first surface and a second surface that are spaced apart from one another and do not intersect with one another. The ultrasound transducer also includes a first electrode disposed on the first surface, a second electrode disposed on the second surface, and an electrical insulator covering only one of first and second electrodes and configured to inhibit electrical conduction between the first electrode and the second electrode when the ultrasound transducer is placed within an electrically conductive fluid. Also disclosed are apparatuses and systems that include such a transducer. Related methods are also disclosed herein.

The invention belongs to the technical field of wire harness assembly, and discloses a flexible wire harness intelligent assembly system and a control method thereof. Comprising the following steps: reading basic information data of an automobile wire harness raw material; according to the read basic information data of the automobile wire harness raw material, selecting a matched wire, and carrying out interception and terminal crimping on the wire to obtain an initial automobile wire harness; detecting the terminal crimping position, judging whether the terminal crimping position of the initial automobile wire harness is qualified or not, detecting the terminal angle, and judging whether the terminal angle of the initial automobile wire harness is qualified or not; electrical detection is conducted on the initial automobile wire harness with the qualified terminal crimping position and terminal angle, whether electrical conduction of the initial automobile wire harness is normal or not is judged, if the electrical conduction of the initial automobile wire harness is normal, assembly of the initial automobile wire harness is qualified, and if the electrical conduction of the initial automobile wire harness is abnormal, assembly of the initial automobile wire harness is unqualified. And potential safety hazards caused by unqualified assembly are reduced.

The utility model provides an electrical connection structure of one or more sections of intelligent dimming films. The electrical connection structure specifically comprises a dimming film body, a flexible circuit board and a control unit. Wherein U-shaped long grooves are designed between independent circuits of the flexible circuit board, and air holes are formed in the conductive adhesive film layer connecting the dimming film body and the flexible circuit board. According to the design of the electrical conduction structure part of the dimming film, the ACF conductive adhesive lamination is used for replacing the solder paste welding technology, the risk of circuit pseudo soldering is avoided, special design is carried out on the FPC and the ACF conductive adhesive, the operation stability of the dimming film is improved, and the risks of short circuit and open circuit which are easily generated by circuit connection are avoided.

The invention discloses an application for improving the insulation performance of electrical equipment based on an electrical conduction optimization protective agent, relates to the technical field of electrical insulation, and aims to dynamically acquire temperature, electric field distribution and humidity parameters, quickly respond to the equipment operation state and environment change, guarantee data accuracy in a high-load or extreme environment and improve the insulation performance of the electrical equipment in the aspects of state evaluation. Constructing a data-driven state model by combining a support vector machine (SVM) and a long short-term memory (LSTM) network algorithm, and performing equipment state trend prediction; in cooperation with an electric field distribution diagram generated based on finite element analysis, a high-risk area is accurately marked, and the comprehensiveness and accuracy of state evaluation are remarkably improved; in terms of protection measures, multiple types of electrical conduction optimization protective agents are applied to a high-risk area, heat-resistant, hydrophobic and high-dielectric-strength protective agents are selected for different problems, the coating thickness is dynamically adjusted in combination with the change of the electric field strength, and insulation degradation caused by local hot spots, electric field concentration and humidity is effectively relieved.

The utility model discloses a chip type lamp bead structure capable of emitting polychromatic light, and relates to the technical field of LED lamp beads, the chip type lamp bead structure comprises a support, an electrode mechanism and a light emitting mechanism, the support is used for providing physical support and electrical conduction basis for the whole lamp bead, the electrode mechanism is fixedly connected to the top surface of the support, the electrode mechanism is used for transmitting current signals, and the light emitting mechanism is used for emitting light. An electric signal supplied by an external power source is guided to the light-emitting mechanism through the electrode mechanism, the light-emitting mechanism is fixedly connected to the top face of the electrode mechanism, and the light-emitting mechanism is used for emitting polychromatic light and the like. A plurality of LED chips connected in parallel can be integrated in the chip type lamp bead, each chip can independently emit light and control different colors, the limitation of a traditional single-color lamp bead is broken through, free mixing of multiple colors can be achieved through the same lamp bead through the innovative design, and the application range of the LED lamp bead in the illumination and decoration field is greatly expanded.

The embodiment of the invention provides a high-density redistribution interconnection packaging structure and a preparation method thereof, and relates to the technical field of chip packaging, and the packaging structure comprises a substrate rewiring layer, a first chip, a first plastic package body, a coating layer, an integrated rewiring layer, a first stacking rewiring layer, a second chip and a second plastic package body. Compared with the prior art, according to the high-density redistribution interconnection packaging structure provided by the embodiment of the invention, the first heat dissipation columns are additionally designed, so that the heat dissipation performance can be greatly improved, and an overheating phenomenon is slowed down. And meanwhile, the first heat dissipation column can be embedded in the first plastic package body and the coating layer at the same time, so that the binding force of each layer of the package structure is greatly improved, the structural stability is ensured, and the warping phenomenon of the package structure is relieved. Meanwhile, electrical conduction is achieved through the first conductive columns and the second conductive columns, parasitic inductance of the wiring layers is reduced, and the phenomena of short circuit, overheating and the like between the wiring layers caused by the electric leakage phenomenon are relieved.

The invention provides a drawing type sun shield, and belongs to the technical field of automobile accessories. The conductive telescopic pipe is arranged on the sunshade body, the sliding seats which are in sliding contact with each other are arranged in the telescopic pipe in a sliding mode, the rotating shaft is made of the conductive material, one end of the rotating shaft extends into the telescopic pipe and is rotationally connected with the sliding seats, and the rotating shaft and the sliding seats are mutually and axially limited, so that the use requirement of overturning of the sunshade plate is met through relative rotation of the rotating shaft and the sliding seats; the sliding seat slides in the telescopic pipe to achieve stretching and retracting of the sun shield, the drawing and pulling use requirement is met, the structure is flexible, adaptability is good, the adjustable range is wide, and the driving and riding comfort and safety are improved, in addition, a first conductive structure is formed by the sliding seat and the telescopic pipe, and the service life of the sun shield is prolonged. The telescopic contact is arranged on the sunshade body and abuts against the outer wall of the rotating shaft to form the second conductive structure, the electric conduction state can be kept all the time under the condition that the requirement for overturning and pulling of the sunshade plate is met, and it is ensured that the function of the sunshade plate can be normally used in any state.

The invention belongs to the technical field of semiconductors, and particularly relates to an insulating substrate based on a diamond ceramic layer and a preparation method of the insulating substrate. The insulating substrate of the diamond ceramic layer is sequentially provided with an upper copper layer, the diamond ceramic layer and a lower copper layer from top to bottom along the thickness direction, the thickness of the diamond ceramic layer is 300-630 microns, and the thicknesses of the upper copper layer and the lower copper layer are both 250-300 microns. The insulating substrate is formed based on the diamond ceramic material, so that the thermal resistance from the power device to the packaging insulating substrate is reduced, the heat dissipation efficiency of the packaging insulating substrate is improved, and the heat dissipation efficiency of the silicon carbide power module is improved; the diamond ceramic layer provides electrical insulation and heat conduction, and the upper and lower copper layers provide heat dissipation and electrical conduction, so that the heat dissipation capability and the current bearing capability of the power module can be effectively improved, the working temperature of the module is reduced, the working power density of the silicon carbide chip is improved, and the reliability of the silicon carbide module is improved.

A solar cell includes a semiconducting substrate, a first emitter, an insulating layer, and a second emitter. The semiconducting substrate includes a first surface and a second surface, and includes a first region and a second region. The first region includes a first sub-region and a second sub-region. The first sub-region is in contact with the second region. The first direction is perpendicular to the thickness direction of the semiconducting substrate. The first emitter is disposed on the first surface and in the first region. The insulating layer is disposed on the first emitter and in the first sub-region. The second emitter is disposed on the first surface. The second emitter includes a first sub-emitter and a second sub-emitter. The first sub-emitter is located on the second region. The second sub-emitter is disposed on the insulating layer. Electrical conduction exists between the first emitter and the first sub-emitter.

The invention belongs to the technical field of graphene film preparation, and particularly relates to a graphene thick film preparation method, which comprises: mixing a boric acid aqueous solution and a graphene oxide dispersion liquid to obtain a boric acid / graphene oxide mixed dispersion liquid; after the mixed dispersion liquid of boric acid / graphene oxide is coated, a solvent is evaporated, and a boric acid doped graphene oxide film is prepared; and stacking a plurality of layers of boric acid doped graphene oxide films, performing pressurization treatment, and performing annealing treatment in an inert atmosphere to obtain the graphene thick film. The preparation method provided by the invention not only solves the problem of film interface effect of the graphene thick film in the prior art and remarkably improves the conductivity of the graphene thick film, but also realizes effective regulation and control of the thickness of the graphene thick film through a simple stacking mode, and the preparation method is suitable for large-scale production. Powerful support is provided for application of the graphene thick film in the fields of electrochemical energy storage, electromagnetic shielding, heat dissipation and electric conduction.

A chuck (100) of a wafer holding device and a wafer holding device. The chuck comprises a chuck frame (110); a plurality of contact members (120), wherein the plurality of contact members (120) are evenly distributed on the chuck frame (110), each of the contact members (120) comprises a fixing portion (121), a connecting portion (122) and a contact portion (123), one end of the fixing portion (121) is connected to an upper end of the connecting portion (122), and a lower end of the connecting portion (122) is connected to the contact portion (123); and a limiting member (400) fixed to the chuck frame (110), wherein the limiting member (400) is used for limiting the connecting portion (122) of each of the contact members (120) so as to reduce the moment arm of the connecting portion (122). By means of providing the limiting member (400), the moment arm of the connecting portion (122) of each of the contact members (120) is reduced, so that the deformation of the connecting portion (122) is within an elastic limit thereof. After a wafer leaves the chuck, an applied external force is removed, so that the connecting portion (122) automatically returns to an original shape. When the next wafer enters the wafer holding device for electroplating, the connecting portion (122) has returned to the original shape and can come into uniform contact with the wafer, thereby ensuring uniform electrical conduction and improving process quality.

The invention discloses conductive structural color hydrogel for MI monitoring and treatment as well as a preparation method and application of the conductive structural color hydrogel. Comprising a conductive nano-material, and the conductive nano-material has a catechol group; an HPC cholesteric liquid crystal; a matrix material; a cross-linking agent; the conductive structural color hydrogel is formed through physical and / or chemical interaction among the conductive nano material, the HPC cholesteric liquid crystal, the matrix material and the cross-linking agent. The conductive structural color hydrogel has enhanced electromechanical response and force-induced discoloration response characteristics, has a photoelectric double-signal sensing function, can accurately and visually monitor mechanical stimulation in real time, can be used as a flexible sensing material, is used for preparing products capable of realizing visual feedback and digital feedback of mechanical stimulation, and has wide application prospects. And the hydrogel can be used for preparing a product for compensating and / or repairing electrical conduction of biological tissues, especially can be used for preparing a conductive structural color hydrogel patch for monitoring and / or treating myocardial infarction (MI), and has a wide application prospect.

The invention belongs to the technical field of cable installation devices, and particularly relates to an aerial cable insulation installation column which comprises a rectangular column, a clamping device and a stretching adjusting device, the clamping device is arranged in the middle of the rectangular column, and the stretching adjusting device is installed at the top of the clamping device; the clamping device comprises an installation platform, a fixed clamp and a movable clamp, the fixed clamp and the installation platform are integrally formed, the fixed clamp extends downwards, the movable clamp is inserted into the installation platform and located above the fixed clamp, clamping grooves are formed in the opposite sides of the fixed clamp and the movable clamp, and the fixed clamp and the movable clamp form a cable clamp. A limiting buckle is arranged on one side, away from the rectangular column, of the cable clamp; according to the scheme, the cable installation equipment which is small in size and convenient to rapidly install is provided for cable installation requirements in special environments such as pits, tunnels and mine holes; multiple insulation barriers are adopted, an electric leakage conduction path is effectively blocked, the excellent insulation performance can still be kept even in a humid and dusty environment, and the electric shock risk is greatly reduced.

Provided is an electrode stacked body that can be used for assembly of an electrochemical device and can reduce an internal resistance, a method for producing the electrode stacked body, and an electrochemical device that includes the electrode stacked body. The electrode stacked body of the present invention includes a first electrode, a second electrode, and an isolation layer interposed between the first electrode and the second electrode. At least one of the first electrode and the second electrode has an electrode mixture layer and a sheet-type porous metal base material. At least a part of the porous metal base material, including one end portion facing the electrode mixture layer, is embedded in a surface layer of the electrode mixture layer and integrated with the electrode mixture layer. The other end portion of the porous metal base material is exposed on the surface of the electrode. The electrochemical device of the present invention includes an exterior body having a conductive path leading to the outside and the electrode stacked body of the present invention. The porous metal base material on the surface of at least one electrode of the electrode stacked body is brought into contact with the conductive path, providing electrical conduction between the electrode and the conductive path.

A component carrier (100) comprising: a stack (102) comprising at least one electrically conductive layer structure (104) and at least one inorganic layer structure (106) wherein the at least one inorganic layer structure (106) has a planar first main surface (108) and an opposite planar second main surface (110); a geometrically discontinuous region (112) at the first main surface (108); and a reinforcing layer structure (114) at the second main surface (110), the reinforcing layer structure (114) at least partially overlapping the geometrically discontinuous region (112) in the lateral direction. The present disclosure also provides a method of manufacturing a component carrier (100).

The invention relates to a manufacturing method of a three-dimensional spiral directional active ventricular structure, which comprises the following steps of: inducing cells and hydrogel fibers to generate directional arrangement by utilizing internal stress generated by a three-dimensional driving bracket encapsulated in hydrogel; a spiral directional ventricle structure consistent with the natural ventricle in arrangement direction is designed and constructed through the macroscopic shape and the structural unit of the three-dimensional driving stent, active ventricle tissue manufacturing with systolic and diastolic, blood pumping and electrical conduction functions is achieved through in-vitro dynamic culture, and the requirements of tissue repair and in-vitro drug testing are met.

The utility model discloses a double-coil contactor, and the contactor comprises a power module which is used for accessing an external power supply voltage to generate a DC voltage, so as to enable a coil loop to be electrically conducted, and carrying out the voltage reduction of the DC voltage, and obtaining a power supply voltage; the external power supply is an AC power supply or a DC power supply; the sampling comparison module is used for sampling the direct-current voltage and generating a working voltage according to the power supply voltage when the sampling voltage is greater than a preset voltage threshold value; the driving module is used for controlling the pull-in coil loop to be electrically conducted based on the direct current voltage in response to the power supply voltage and the working voltage, and controlling the pull-in coil loop to be electrically disconnected in response to the trigger signal; the time delay module is used for generating a trigger signal when the duration of electrical conduction of the pull-in coil loop reaches a preset duration. According to the double-coil contactor, the AC voltage of the AC power supply can be converted into the DC voltage for control through the power supply module, and the application range of the double-coil contactor is greatly expanded.

The electrified rail transit overhead power supply system comprises a stand column, a power supply bow and a power receiving cable, and the stand column is arranged on one side of a rail; the power supply bow is mounted on the upright; the power receiving cable extends in the length direction of the traction locomotive to be arranged on the top of the traction locomotive and makes contact with the power supply bow for electric conduction. The power supply bow transmits power to the traction locomotive through the power receiving cable. The precise butt joint of the power receiving cable and the power supply bow replaces a traditional pantograph and a contact net, and the problems that the traditional contact net is unstable in power supply, prone to being affected by extreme weather, high in construction and maintenance cost and the like are successfully solved. Compared with a traditional contact network, the power supply system is simpler in structure and more convenient to maintain, the maintenance cost and human input are reduced, and a new thought and a new solution are provided for development of the rail transit power supply technology.

The invention relates to the technical field of electronic cigarettes, and particularly discloses an anti-wrinkling electronic cigarette microphone and an electronic cigarette thereof.The anti-wrinkling electronic cigarette microphone comprises a mounting plate, a mounting arm is fixedly mounted on one side of the mounting plate, and a connecting frame is fixedly mounted on the face, close to the mounting arm, of the mounting plate. The hook is inserted into the hanging hole of the connecting piece, the sliding plate is inserted into the sliding groove, and the telescopic spring is reset to tension the diaphragm body, so that on one hand, the diaphragm body is tightly attached to the circuit board to achieve electrical conduction, and on the other hand, the diaphragm body is tightened to avoid wrinkles. After the old diaphragm body is removed and the new diaphragm body is installed, the sliding strip is inserted and the bottom cover is screwed, the ventilation window of the bottom cover can realize gas circulation, the dustproof net can filter and prevent dust and keep the microphone performance, the telescopic spring can keep the diaphragm body tight to ensure the detection precision, the diaphragm body can be rapidly replaced, the maintenance cost is reduced, and the service life is prolonged.

The utility model relates to a charger with plugs of various specifications, which comprises a shell internally provided with an accommodating cavity and a plurality of plugs of different specifications, a circuit board is mounted in the accommodating cavity, and the plugs are arranged on the shell in a foldable manner and / or arranged in the accommodating cavity in a limited sliding manner and can penetrate out of the shell. The shell is also provided with a switch which is electrically connected with the circuit board and is used for adjusting electrical conduction between the plugs of different specifications and the circuit board; the shell is further provided with an electric connection interface electrically connected with the circuit board. The portable charger is convenient to carry and use, and the switch arranged on the charger can conveniently control the electrical conduction of different plugs, so that the safety in use is ensured.

The utility model discloses a high-frequency welding device, which relates to the technical field of high-frequency welding and comprises two welding units capable of simultaneously welding a plurality of workpieces respectively. The electric conduction mechanism is arranged between the two welding units and used for controlling power on and power off of the two welding units; each welding unit comprises two groups of welding mechanisms, the two groups of welding mechanisms are respectively provided with welding surfaces which are oppositely distributed, and at least one of the welding surfaces is provided with a protective coating. According to the high-frequency welding machine, the welding unit and the electric conduction mechanism are arranged in a matched mode, simultaneous welding of a plurality of workpieces can be achieved while energy of the high-frequency welding machine is not increased, and the production efficiency is improved; the protective coating is arranged on the welding surface of the welding mechanism, so that ignition and shutdown caused by too short distance of the welding surface when the welding mechanism is used for welding a workpiece are prevented, and the service life of equipment is effectively prolonged.

The utility model relates to the technical field of photoelectric encoders, in particular to a wire outlet structure of a photoelectric encoder, which mainly comprises a wire outlet cavity arranged in a shell, a plug, a prepressing spring, a limit spring and an O-shaped ring arranged in the wire outlet cavity, an end cover mounted at an opening at the front end of the wire outlet cavity, a wiring hole arranged at the rear end of the wire outlet cavity, and a wire outlet arranged in the wiring hole. An internal cable of the photoelectric encoder penetrates through the wiring hole to be connected to the rear end of the plug, and the internal cable is sleeved with the pre-pressing spring; a plurality of limiting springs are arranged on the side face of the plug for elastic supporting, an external cable of the photoelectric encoder is connected with a socket matched with the plug, and electric conduction between the external cable and the internal cable is achieved through the plug and the socket. The wire outlet structure has the advantages of being good in sealing performance, high in shock resistance, easy to disassemble and the like, and the waterproof and dustproof performance of the encoder is improved when the wire outlet structure is applied to the encoder.

The utility model relates to the field of door and window design, and provides a shutter blind control structure which comprises a driving motor and a control module which are arranged in a window frame, and a storage battery is arranged in the control module; a mounting base is embedded in the outer side face of the window frame and provided with a first conductive piece, and the first conductive piece is electrically connected with the driving motor. The control module is detachably mounted on the mounting seat, the control module is provided with a second conductive part connected with the storage battery, and in the mounting state, the first conductive part is in contact with the second conductive part, so that electrical conduction between the control module and the driving motor is achieved. On the basis, the battery can be conveniently charged, when the control module or the internal battery breaks down, the control module can be conveniently maintained and replaced, and normal lifting and overturning of the shutter are ensured.

The utility model provides a thermal gradient test device and system, which relates to the field of thermal gradient test technology. The thermal gradient test device includes a gas-electric hybrid slip ring and a bracket device. The gas-electric hybrid slip ring has a rotating part and a stationary part connected to each other. The clamping device is connected to the rotating part so that the clamping device can rotate relative to the stationary part, and at the same time, maintain gas conduction and electrical conduction during the rotation process. The clamping device includes a clamping end cover, a support column and a clamping base. The clamping end cover and the clamping base are respectively connected to the two ends of the support column. The clamping end cover and the clamping base clamp the two ends of the test piece respectively. The support column is provided with a thermocouple and a cold air duct. The cold air duct is used to provide cold air to the test piece, and the thermocouple is used to detect the temperature of the cold air side of the test piece. When the other side of the test piece is subjected to high-temperature gas of a preset temperature, a specific temperature gradient can be formed in the test piece, so as to realize the thermal gradient high-temperature gas environment assessment of the test piece.

A lead-acid storage battery gel electrolyte resistance testing device belongs to the technical field of lead-acid storage battery testing and comprises a support, a container is arranged on the support, and a pressing mechanism is arranged at the upper end of the container. According to the invention, a four-terminal alternating current method measurer is adopted to measure the electrolyte resistance, so that the precision of electrolyte resistance measurement is improved. Graphite is used as an electrode, so that the accuracy of electrolyte resistance measurement is improved, in addition, in order to increase the contact area between the electrolyte and the lower graphite disc and the contact area between the electrolyte and the upper graphite disc, hemispherical contacts are arranged on the contact surface between the lower graphite disc and the electrolyte, and the contact area between the lower graphite disc and the upper graphite disc is increased. A lower convex ring and a radiation strip are arranged on the contact surface of the upper graphite disc and the electrolyte, in addition, the end parts of the lower graphite disc and the upper graphite disc are designed through a conductive conical column and a connecting conical column which are made of copper alloy and through a conical surface structure, and meanwhile, electric force compound grease with copper, aluminum and other particles is filled between the conductive conical column and the connecting conical column; therefore, the electrical conductivity is improved.

A power semiconductor device includes a semiconductor structure comprising an active region, and a plurality of stress relief trenches in the semiconductor structure laterally between the active region and at least one edge of the semiconductor structure. The stress relief trenches respectively comprise opposing sidewalls and a dielectric material and / or a semiconductor material therebetween, and do not contribute to electrical conduction between first and second terminals of the power semiconductor device. Related devices and fabrication methods are also discussed.