63results about How to "Simple processing technology" patented technology

The application discloses a photovoltaic silicon monocrystal wafer group, a crystal column group, a photovoltaic cell and a photovoltaic module. The wafer group comprises rectangular silicon wafers cut from the middle of a base circle silicon wafer and axisymmetric non-rectangular polygonal silicon wafers symmetrically cut from the periphery of the rectangular silicon wafers. The cutting size of the rectangular silicon wafers is determined according to the distribution of vacancy-type point defect density C V and interstitial-type point defect density C I of the base circle silicon wafer and the distribution of minority carrier lifetime in different radial regions of the base circle silicon wafer, so that the rectangular silicon wafers are located in the region of C V ‑ C I ≥0, and the ratio d of the distance between the four corners of the rectangular silicon wafer and the minimum point of the minority carrier lifetime in the edge region of the base circle silicon wafer to the diameter of the base circle silicon wafer is 2%≤d≤8%. The method is based on the quality distribution rule of the silicon wafer to divide the silicon wafers into two types, and different cell processes are adopted to fully tap the potential of each type, so that the area utilization rate of the base circle silicon wafer is more than 90% while high-quality photovoltaic modules are obtained.

The application discloses a high-temperature and high-pressure combustion chamber spectrum characteristic transmission device based on a special optical fiber probe head, which comprises an optical fiber probe head, a light guide optical fiber, a light emitting characteristic analysis device and a cooling liquid pump; the optical fiber probe head comprises high-transmittance optical glass, a metal cooling sleeve and an optical flange; the high-transmittance optical glass can transmit ultraviolet-visible light with a wavelength of 100-760 nm; the metal cooling sleeve comprises a cylindrical sleeve and a connecting cap; the cylindrical sleeve is coaxially arranged on the outer periphery of the high-transmittance optical glass and is sealingly arranged in a probe head mounting hole; the light guide optical fiber can collect the ultraviolet-visible light transmitted through the high-transmittance optical glass and is connected with the light emitting characteristic analysis device; and the cylindrical sleeve and the connecting cap are both provided with cooling channels connected with the cooling liquid pump. The application can analyze the chemical reaction light emitting characteristics in the high-temperature and high-pressure combustion chamber in real time, is especially suitable for monitoring the spontaneous radiation characteristics of OH*, CH* and C2* groups generated in the combustion process, and thus can determine the reaction region and the reaction heat release.

This invention discloses a Z-axis micromechanical accelerometer and its control method, belonging to the field of acceleration measurement technology. An asymmetric seesaw sensing structure is constructed using mass blocks and a torsional elastic beam. Two symmetrical multifunctional capacitors are formed by designing electrodes below the two mass blocks. The torsion generated by the seesaw structure under Z-axis acceleration can be detected by the change in the differential capacitance of the capacitors, where the capacitors serve as the detection mechanism. Based on the detected change in torsion angle and the PID controller, a PWM voltage for force balance control can be calculated and applied to the symmetrical capacitors via a push-pull method, together with a DC tuned voltage. This generates a constant electrostatic negative stiffness, thereby reducing the equivalent stiffness of the seesaw sensing element, and also generates an electrostatic resultant force that can be modulated by the PWM, maintaining the position of the seesaw sensing structure constant, achieving closed-loop detection. The PWM voltage reflects the magnitude of the external acceleration.

A motor rotor, a motor using the rotor and a kind of oil fume suction, a kind of motor rotor, characterized in that, the motor rotor includes: a plurality of sequentially laminated rotor core punching sheet, rotor core punching sheet includes inner rotor punching sheet and outer rotor punching sheet;Outer rotor core is also provided with magnetic steel slot along the circumferential direction at intervals;Magnetic steel assembly and filler;Wherein, the outer rotor punching sheet includes a plurality of outer rotor punching sheet units, adjacent outer rotor punching sheet units are independent and form the magnetic steel slot;The outer contour of each outer rotor punching sheet unit is the continuous arc line formed by the intersection of at least two eccentric circular arcs, and the center of each eccentric circular arc is eccentric with the center of the outer circle of the rotor core punching sheet.The utility model has the advantages that: multiple eccentric circular arc structure is adopted, the leakage magnetic quantity is greatly inhibited under the condition of guaranteeing output characteristic, the motor output torque characteristic is improved, high performance and good NVH characteristic are realized.

The utility model discloses an integrated optical fiber isolator for a laser in the field of optical devices, which comprises an integrated optical fiber, the integrated optical fiber comprises an optical fiber body and a plurality of micro-nano structure pairs positioned in the optical fiber body, and the optical fiber body comprises a core layer and a cladding. The included angle between the micro-nano structure pair and the forward transmission direction of the integrated optical fiber is smaller than 90 degrees, so that the micro-nano structure pair is coupled with light which is reversely transmitted in the core layer. According to the utility model, the micro-nano structure is processed on the optical fiber body, and the micro-nano structure is utilized to realize the isolation of the reverse light, thereby not only reducing the damage of the reverse light to the device, but also being higher in integration level and smaller in size of the whole isolation device, and reducing the risk of damage.

The utility model discloses a kind of electric actuator hand wheel anti-pressing malfunction locking devices, it is related to industrial system electric actuator technical field, to solve the gear damage caused by external force mispressing of electric actuator hand wheel, remote automatic adjustment function failure, even cause parameter deviation or tripping problem.The device includes anti-escape locking pad and anti-escape locking pin, anti-escape locking pad is equipped with anti-escape locking pin positioning hole, anti-escape locking pad can be processed into corresponding size according to the pressing gap of different models electric actuator hand wheel and hand wheel shaft diameter, anti-escape locking pin is fixed in electric actuator hand wheel pressure gap position by passing through positioning hole with anti-escape locking pad, and close hand wheel and actuator.This device can effectively prevent hand wheel from being pressed down by external force, low in cost, high in compatibility, suitable for a variety of imported and domestic electric actuator with hand wheel operating device.

This utility model discloses a connection structure between the bottom tube and the middle tube of an electric vehicle frame, as well as the electric vehicle frame itself. The connection structure includes a middle tube and a bottom tube. The middle tube is a round tube with a first groove on its bottom side. The first groove includes a first upper end face and a first side end face. The bottom tube is a square tube. The height and width of the first groove match the height and width of the bottom tube, respectively. The rear end of the bottom tube has an arc-shaped structure that matches the wall shape of the middle tube. The upper end face of the bottom tube abuts against the first upper end face and is connected by a first weld. The side end face of the bottom tube abuts against the first side end face and is connected by a second weld. The rear end face of the bottom tube abuts against the middle tube and is connected by a third weld. The connection structure between the middle tube and the bottom tube of the frame is optimized, eliminating the original reinforcing plate design. The bottom tube and the middle tube adopt an insert connection, reducing the number of parts, lightening the overall vehicle weight, shortening the weld, optimizing material preparation and welding processes, and maintaining the overall strength of the vehicle.

The utility model provides a kind of automobile safety air bag quick inflation device, belong to safety air bag technical field. Including jar body, the outside of jar body is fixedly connected with mounting seat, the inside center of jar body is fixedly connected with fixed cylinder, fixed cylinder inside is equipped with igniter, and powder barrel is inserted in the outside of fixed cylinder in jar body inside. The utility model discloses that the release hole is set in the top of sealing cover, so that the gas generated by gas generating agent can flow upwards from the bottom of the jar, and is discharged to the top of the sealing cover. In this gas discharge process, it will be filtered by filter cartridge, effectively prolonging the filtering time of the gas, and thus more fully filtering out harmful substances in the gas. In addition, by optimizing the design of the structure of the powder barrel, the booster tank and the sealing cover, they can be sequentially inserted and installed on the jar before the welding process. Only the connection between the jar and the sealing cover needs to be welded to complete the overall fixation.

The application discloses a low-illumination image enhancement method based on an improved Retinex algorithm, and applies to the technical field of image enhancement, and comprises the following steps: performing discrete wavelet decomposition on a low-illumination image to obtain low-frequency and high-frequency components of the image; converting the low-frequency component into HSV, separately performing brightness correction on a V channel, then converting back to RGB, performing bilateral filtering, and then converting to HSV to extract the V channel; performing image enhancement on the low-frequency component by using an improved Retinex algorithm based on a joint weighting of a bilateral filter and a Gaussian filter as a new center-surround function, and performing median filtering processing, then converting to HSV to extract the V channel; weighting and fusing the two V channels, retaining the H and S channels after algorithm enhancement, then converting back to RGB, performing discrete wavelet fusion with the high-frequency component after denoising, and stretching and outputting the enhanced low-illumination image. The application can effectively guarantee the color, edge details and avoid local distortion of the image.

The utility model provides a sign lamp circuit board mounting structure, including circuit board and backplate, and circuit board is connected with backplate through the buckle structure and the anti -backoff structure of setting on backplate, the utility model has the advantages of: the fixation of both is realized through the buckle structure and the anti -backoff structure of design on backplate of circuit board, and process technology is simple, and efficiency is high, and it is unnecessary to wait for sealant solidification time, and there is no special requirement to operating personnel, thereby greatly improve production efficiency and good product rate, and bring better economic benefits for enterprise production.

This invention relates to the field of machining technology and discloses a laser-assisted laser-cutting linkage milling method and apparatus. The method includes the following steps: inputting initial machining parameters; setting the machining trajectory of the spindle tool; discretizing the machining trajectory of the spindle tool to form a series of discrete coordinate point sets; calculating the C-axis rotation angle and U-axis extension of the laser revolution system based on the data in the discrete coordinate point set; and generating CNC code adapted for laser-assisted milling based on the initial machining parameters and the calculated C-axis rotation angle and U-axis extension, which is then input into the CNC system to perform laser-assisted milling on the machine tool. This invention aims to solve the problems of traditional methods, which are prone to control sequence errors, parameter mismatches, decreased machining accuracy, and safety risks due to the inability to accurately control the laser trajectory to achieve sufficient and timely preheating.

The application provides a high-performance insulation blanket, which comprises a surface layer, an EVA adhesive layer and a surface layer arranged in sequence, and the surface layer and the EVA adhesive layer are calendered and bonded; the preparation raw materials of the surface layer comprise, in parts by weight, 45-55 parts of ethylene-vinyl acetate copolymer, 10-20 parts of natural rubber, 8-18 parts of PA6 short fiber, 7-10 parts of dopamine modified mica powder, 6-10 parts of MAH-g-EVA, 10-15 parts of flame retardant, 0.2-0.4 parts of antioxidant, 0.8-1.2 parts of lubricant and 2-4 parts of colorant. In the surface layer formula system, the natural rubber, the PA6 short fiber and the dopamine modified mica powder synergistically act, so that the tear resistance and the puncture resistance of the material are greatly improved, and meanwhile, the material has excellent comprehensive performances such as high-temperature resistance, insulation, flame retardation and aging resistance, and is suitable for high-demand insulation protection fields.

This invention provides a method for preparing and applying perovskite thin films with controlled crystallization. An improved perovskite precursor solution is prepared by mixing an aminopiperidine derivative solution with a perovskite precursor solution. This solution is then coated onto a hole transport layer in air and annealed to obtain a perovskite thin film, which serves as the photoactive layer. This invention incorporates a molecular additive containing a specific piperidine group into the perovskite precursor solution, which controls the crystallization of the perovskite, passivates defects in the perovskite thin film, and optimizes charge transport performance. The perovskite thin film device controlled by the aminopiperidine derivative in this invention exhibits significantly improved reproducibility, with the photoelectric conversion efficiency increasing from 21.68% to 23.17%.

The utility model discloses a split type charging pile which comprises a charging module box and a device case, the charging module box and the device case are arranged at an interval in a first direction, and the charging module box and the device case are connected through a waterproof wiring pipe. A charging module is arranged in the charging module box, the charging module box is provided with a first end and a second end opposite to the first end in a second direction perpendicular to the first direction, the first end is provided with an air inlet, the second end is provided with an air outlet, and a charging gun is installed on the device case. According to the utility model, the charging module box and the device case are arranged at an interval in the first direction, and the air inlet and the air outlet are arranged in the second direction, so that heat generated by operation of the charging module does not affect components in the device case, and risk-free operation of the components in the device case is ensured; the noise is low, the processing technology is simple, the transportation is convenient, and the cost is effectively reduced.

The utility model discloses a computer keyboard tray push-and-pull device which comprises a computer desk and a keyboard tray which is arranged below the computer desk and can linearly move back and forth with the computer desk, and further comprises a push-and-pull device and a U-shaped installation support, the push-and-pull device comprises a sliding rail assembly and a sliding groove, the sliding rail assembly is fixedly connected with a computer desk panel through the U-shaped installation support, and the sliding groove is fixedly connected with the computer desk panel. The bottom wall of the sliding groove is fixedly connected with the left side face and the right side face of the keyboard tray, and the sliding groove is inserted into the sliding rail assembly and connected with the sliding rail assembly in a front-back linear moving mode. The U-shaped installation support comprises a fixing plate, a U-shaped groove plate and a pressing screw rod. By arranging the U-shaped mounting bracket, the bottom mounting mode of the keyboard tray is changed into a left and right side mounting mode, so that the stability is improved, the keyboard tray can be conveniently mounted and dismounted, a common office table is changed into a computer table without drilling into the lower part of a table panel, the labor intensity of an operator is low, and the U-shaped mounting bracket is simple in structure and convenient to process; the cost is low.

The utility model relates to a kind of medium voltage ring main unit static contact shielding cover, including two symmetrically arranged in the static contact two sides cover body and a for connecting static contact and two cover body's fixed plate, cover body includes trapezoidal flat plate part, annular side plate part, annular transition part, waist-shaped protrusion and reinforcing rib, annular transition part surrounds in trapezoidal flat plate part four around, annular side plate part is located annular transition part inboard, the two sides of annular transition part respectively through rounded corner connection trapezoidal flat plate part and annular side plate part, waist-shaped protrusion and reinforcing rib are arranged in annular side plate part inboard, fixed plate is U-shaped structure, fixed plate is set between two cover body, the two sides of fixed plate respectively through screw and the waist-shaped protrusion of two cover body's detachable connection, the middle part of fixed plate is opened for connecting static contact's mounting hole;The utility model is simple in structure, easy to install, can effectively improve the electric field in disconnecting switch, improve the overall performance and reliability of medium voltage ring main unit disconnecting switch.

The application belongs to the field of rail technology and provides a special-shaped door stand column and a rail car door structure. The special-shaped door stand column comprises a column body, which is a hollow structure. The column body is sequentially connected in a head-to-tail mode by an upper edge, a first side edge, a lower edge and a second side edge. The lower edge is connected by a first horizontal edge, a first vertical edge, a second horizontal edge, a second vertical edge and a third horizontal edge to form a bending structure along the length direction. The first horizontal edge and the third horizontal edge are arranged in a staggered mode along the width direction. The special-shaped door stand column can improve the strength of the stand column.

The invention provides a quick butt joint mechanism. The quick butt joint mechanism comprises an inserting table, a base and a ring buckle, wherein the inserting table comprises a fixed part and an inserting part which are oppositely arranged, and the inserting part is provided with a first groove; the base is provided with a first end face and a second end face which are oppositely arranged; thering buckle is provided with an opening and can elastically contract, and the ring buckle is arranged on the inserting table in a sleeve mode and is accommodated in the first groove; the ring buckle can be inserted into the base in the inserting direction together with the inserting part of the inserting table, and the ring buckle can abut against the second end face of the base through elastic expansion, and limits the reverse movement of the inserting table in the inserting direction; the base is provided with a second boss, and the second boss is used for positioning the relative positionalrelationship between the base and a second embedded assembly in the quick butt joint mechanism. According to a quick butt joint assembly provided by the invention, the relative position relationshipbetween the base and the second embedded assembly is rapidly determined through the second boss, and the phenomena of dislocation and the like generated after the joint between the second embedded assembly and the base is stressed can be avoided.

The application discloses a kind of XLPE power cable air gap defect identification and positioning method, obtain XLPE cable sample containing air gap defect;XLPE cable sample containing air gap defect is tested by terahertz time-domain spectroscopy reflection mode, and the terahertz time-domain spectroscopy reflection of XLPE cable sample containing air gap defect is obtained;Based on the terahertz time-domain spectroscopy reflection of XLPE cable sample containing air gap defect, determine the phase information of main wave and air gap reflection echo;According to the phase information of main wave and air gap reflection echo, construct reflection model, based on reflection model, the accurate positioning of air gap defect is completed by optical calculation.The application provides a kind of detection mode with high precision, fast operation speed, low energy, safe and reliable for XLPE power cable defect identification method, can realize real-time monitoring and accurate positioning to XLPE power cable air gap defect.

The invention belongs to the technical field of high-entropy alloys, and particularly relates to a high-toughness CoCrNiAl series eutectic high-entropy alloy additive manufacturing method. Aiming at the condition that traditional additive manufacturing metal materials are insufficient in strength and toughness, the invention provides the principle that in-situ refining of an additive manufacturing structure is realized through a fine and uniform B2 phase capable of being sheared by utilizing the characteristic of rapid solidification of additive manufacturing, so that the strength and toughness are comprehensively improved. Based on the principle, the general formula of the eutectic high-entropy alloy is CoaCrbNicAld, a is larger than or equal to 29 and smaller than or equal to 35, b is larger than or equal to 18 and smaller than or equal to 23, c is larger than or equal to 27 and smaller than or equal to 35, d is larger than or equal to 13 and smaller than or equal to 19, and a + b + c + d = 100. The eutectic high-entropy alloy prepared through the laser powder bed melting technology achieves high strength, high ductility and high fracture toughness under the condition that subsequent heat treatment is not needed. The design principle of the invention can also be popularized to other eutectic high-entropy alloy systems.

The utility model discloses a water pipe fitting with a hidden PPR (pentatricopeptide repeats) groove, which relates to the technical field of water pipe connection and comprises a PPR water pipe fitting body, a step structure is arranged inside a pipe connecting section of the PPR water pipe fitting body, and the step structure consists of a pipe fitting section A, a pipe fitting section B and a step surface for connecting the pipe fitting section A and the pipe fitting section B; an annular groove is formed in the step face and used for containing PPR hot melting excess materials generated during hot melting connection. The PPR pipe solves the problem that in the connecting process of an existing PPR pipe, hot melting excess materials are accumulated to form pipeline blocking points.

This invention relates to the field of planetary gear technology, specifically to a structure and method for preventing planetary gear shaft detachment. By creating coaxial first and second holes on the planet carrier and planetary gear shaft respectively, an elastic cylindrical pin is inserted into both holes, utilizing its elasticity to provide radial force for radial fastening. A limiting ring prevents the elastic cylindrical pin from detaching, and a clearance fit between a limiting groove and a limiting protrusion further restricts its movement and rotation. The staggered arrangement of the grooves creates a reverse clamping force when the elastic cylindrical pin spirals up, forming a multi-limiting mechanism. This invention absorbs impact through an elastic structure, avoiding the rapid failure problem of traditional fixing methods and improving limiting reliability; it also requires fewer parts and has a simpler manufacturing process.

The invention discloses a wear-resistant tower-shaped packing for petroleum drilling and production equipment, which comprises a packing, the packing is a tower-shaped spiral packing, and the packing consists of a rubber matrix and reinforcing cloth, the rubber matrix is prepared from the following raw materials in parts by weight: 100 parts of rubber compound, 1 to 1.5 parts of stearic acid, 30 to 40 parts of filler, 20 to 25 parts of N330 carbon black, 8 to 10 parts of graphite, 2.3 to 2.6 parts of sulfur, 2.4 to 3 parts of accelerant and 12 to 15 parts of dioctyl phthalate. The rubber base body is high in abrasion resistance and rebound resilience, and meanwhile the reinforcing cloth is transversely distributed in the rubber base body, so that the service life of the packing can be greatly prolonged.

This invention relates to an integrated mandrel and a rotary transmission device with an integrated mandrel, belonging to the field of conductive slip ring technology. It solves the technical problem that the quality of electric slip rings is heavily dependent on the precision of machining and assembly processes, and that the transmission lines on the conductive ring are easily damaged, leading to reduced transmission quality. The integrated mandrel of this invention includes a mandrel base, pads, conductive pins, and transmission lines. Multiple sets of axial outlet holes, pin holes, and pads are evenly distributed circumferentially on one end face of the mandrel base. Multiple V-grooves are evenly distributed axially on the mandrel base, and each V-groove has a radial outlet hole at its bottom. The transmission line is disposed within the mandrel base, with both ends connected to the axial and radial outlet holes. The rotary transmission device with an integrated mandrel of this invention includes an integrated mandrel, a quick-connect body, a brush unit, a fixing frame unit, a mandrel connecting ring, and an external wire-connected connector. The integrated mandrel of this invention has a simple structure and can be flexibly customized; the rotary transmission device has good transmission performance.

The invention relates to the technical field of motors, and particularly provides a motor stator punching sheet and a motor, and the motor stator punching sheet comprises a plurality of punching sheet assemblies which are distributed along the circumferential direction of the motor stator punching sheet; the punching sheet assembly comprises a shoe unit, the shoe unit is arranged at one end, close to a motor rotor, of the punching sheet assembly, a matching edge is arranged on one side, close to the motor rotor, of the shoe unit, and the matching edge is of an arc-shaped structure protruding towards the motor rotor. The punching sheet assembly is provided with the matching edge of the arc-shaped structure, so that the air gap between the motor stator and the motor rotor is in a non-uniform state, the magnetic flux density distribution of the air gap is close to a sine wave, and the cogging torque can be reduced.

This invention relates to the field of composite pipe production equipment and discloses a winding machine. It includes a winding machine base (1); a winding machine housing (2); a central rotating frame (30), the side plates (32) of which are connected to each other to form a housing structure around the axis of rotation; and a plurality of tape feeding units (50), each tape feeding unit being respectively installed on the side plate (32) and including a tape reel bracket (52) for mounting a tape reel (51). The tape reel bracket is configured to allow the reinforcing tape on the tape reel to be wound onto a core tube that passes through the central rotating frame and extends along the axis of rotation during the rotation of the central rotating frame. In this invention, the central rotating frame is configured as a housing structure formed by the side plates being connected to each other to form around the axis of rotation, increasing the bending section modulus of the central rotating frame and thus improving its stiffness. This central rotating frame structure is robust and can withstand large loads.

The utility model provides a wiring terminal structure, which comprises a connecting part and a binding post arranged on the connecting part, the connecting part is arranged to be of a Z-shaped structure so that the connecting part can be arranged at a high position, and the binding post is arranged at the top of the connecting part along the height direction; according to the utility model, the height of the binding post can be correspondingly shortened through the mode of heightening the connecting part in the Z shape, so that the total height of the whole binding post meets the installation requirement, the cost is saved, the processing technology is simple, and the problems that the connecting part of the traditional binding post structure in the prior art is generally linear, and the cost is low are solved. Therefore, the total length of the binding post is required to be longer.

The invention discloses a compound based on triarylamine, a preparation method of the compound, a photocuring adhesive and application of the photocuring adhesive. The triarylated amine-based compound comprises a compound which takes a bis-triarylated amine structural unit as a core structure and takes an organic group containing a carbon-carbon double bond as a side chain structure. The triarylamine-based compound has the characteristics of wide band gap, high light transmittance, high refractive index and high stability, the triarylamine-based compound containing carbon-carbon double bonds can be cured in a thermal initiation or photo-initiation mode to prepare a coating, and the triarylamine-based compound has the advantage of high efficiency and polymerizability.

The invention discloses a heterogeneous pipe connecting structure for transmitting loads. The heterogeneous pipe connecting structure comprises a composite pipe, a front connector, a rear connector, a front auxiliary connector and a rear auxiliary connector. The front joint comprises a front joint external thread section and a front joint bonding section; a front joint inner bonding cavity, a front joint inner thread cavity and a front joint cavity are formed in the front joint; the rear joint comprises a rear joint body, a rear joint internal thread cavity, a rear joint transition cavity, a rear joint internal fine thread cavity and a rear joint bonding cavity; the outer surface of the composite pipe is bonded with the metal joint, the inner surface of the composite pipe is bonded with the metal auxiliary joint, and the joint and the auxiliary joint form an integral structure through the fine threads, so that the bonding area of the composite pipe and the metal joint is increased, and the bonding strength is improved. A plurality of annular grooves are formed in the bonding surfaces of the front joint, the front auxiliary joint, the rear joint and the rear auxiliary joint of the metal part, so that the uniformity of a bonding agent is effectively improved, and the bonding sealing performance of the composite pipe and the metal joint is improved after secondary bonding.

The present application relates to the technical field of fuel cell, in particular to a blind end plate, a fuel cell and a vehicle, the blind end plate comprises a body, a flow channel part and a tail hydrogen inlet port are arranged on one side surface of the body, tail hydrogen outlet ports and tail hydrogen water outlet ports are further arranged on the body; the tail hydrogen inlet port, the tail hydrogen outlet port and the tail hydrogen water outlet port are communicated with the flow channel part respectively; the tail hydrogen inlet port is a through hole or a blind hole, the tail hydrogen outlet port and the tail hydrogen water outlet port are both through holes; the height of the horizontal plane where the tail hydrogen outlet port is located is higher than that of the tail hydrogen water outlet port; through the blind end plate, the heat of the tail hydrogen is used to heat the end of the fuel cell stack, the temperature difference between the single cell at the end of the fuel cell stack and the single cell at the middle position is reduced, so that the performance is improved.