50results about How to "No current" patented technology

The invention relates to an electric locomotive non-power-off neutral section passing-electric energy quality comprehensive compensation device and method, which belongs to the technical field of railway transport equipment and electric electronics. The device comprises a controllable transfer switch, a single-phase step down transformer, a single-phase step down transformer with a middle tap, a two-phase back-to-back converter sharing a DC-side capacitor, a circuit breaker switch, four position sensors and three electric quantity sensors. In the method, when the electric locomotive passes the neutral section, the controllable transfer switch is turned off, and the device works in a non-power-off neutral section passing mode to perform control on amplitude and phase of the neutral section voltage and enable the electric locomotive to pass the neutral section with load in a non-power-off manner. Without locomotive passing, the controllable transfer switch is closed, and the device works in an electric energy quality comprehensive compensation mode and has functions of active power transfer as well as inactive power and harmonic compensation. Through the device, the problems relating to electric energy quality of a traction substation and neutral section can be comprehensively solved based on the traditional traction power supply mode.

The invention relates to an electric split-phase non-interruption flexible connection-compensation device and method for a traction electric network, belonging to the technical fields of railway transportation equipment and electric power and electronics. The device comprises a two-phase back-to-back converter set and three position sensors, wherein the two-phase back-to-back converter set comprises two single-phase converter sets Va and Vb sharing a DC side capacitor set, and two single-phase reduction transformer sets Ta and Tb respectively connected with AC sides of the two single-phase converter sets Va and Vb, or a single-phase reduction transformer set Ta or Tb connected with the AC side of the single-phase converter set Va or Vb, and also comprises three electric quantity sensors, a killer switch, a controllable fling-cut switch and a main controller. The device can work in two modes, and realizes that an electric locomotive passes through split phases without interruption and with loads. The device has functions of active power transfer, reaction power compensation and harmonic compensation, and can solve the problems of three-phase voltage imbalance, voltage fluctuation, low power factor, harmonic pollution and the like in a traction substation.

The invention discloses a composite maximum-dip-angle fiber bragg grating biochemical sensor and a production method thereof. The composite maximum-dip-angle fiber bragg grating biochemical sensor comprises an optical fiber core and an optical fiber cladding, and is characterized in that a first oblique fiber bragg grating is arranged on the front section of the optical fiber core, and an angle formed between an oblique grating stripe of the first oblique bragg grating and a longitudinal axis of an optical fiber is 45 degrees; a second oblique fiber bragg grating is arranged on the front half section of the middle section of the optical fiber core, and an angle formed between an oblique grating stripe of the second oblique fiber bragg grating and the longitudinal axis of the optical fiber is 79 to 84 degrees; a fiber bragg grating is arranged on the rear half section of the middle section of the optical fiber core; the outer surfaces of the front section and the rear section of the optical fiber cladding are respectively coated with an optical fiber protective coating; the outer surface of the middle section of the optical fiber cladding is provided with a silane layer in an adsorbing manner; the outer surface of the silane layer is provided with an aptamer layer, and the aptamer layer has a selective absorption or sensitive characteristic for a target bio-molecular or a to-be-tested chemical component. The composite maximum-dip-angle fiber bragg grating biochemical sensor can be widely applied to the fields such as biology, chemical industry, medicine and life science.

The invention discloses a great-angle tilted fiber bragg grating mechanical vibration sensing array and a great-angle tilted fiber bragg grating mechanical vibration sensing system. The great-angle tilted fiber bragg grating mechanical vibration sensing array comprises an optical fiber core, and is characterized in that: the front section of the optical fiber core is provided with a 45-degree tilted fiber bragg grating, and the 45-degree tilted fiber bragg grating serves as a polarizer of a great-angle tilted fiber bragg grating vibration sensor; an included angle between tilted grating stripes of the tilted fiber bragg grating and an optical fiber cross section is 45 degrees; the middle section of the optical fiber core is provided with N great-angle tilted fiber bragg gratings, and N is a natural number greater than or equal to 1; grating stripes of the N great-angle tilted fiber bragg gratings are parallel to one another, and an included angle between the tilted grating stripes of each great-angle tilted fiber bragg grating and the optical fiber cross section ranges from 79 to 84 degrees; and the outer surface of an optical fiber cladding corresponding to each great-angle tilted fiber bragg grating is provided with an elastic membrane. The great-angle tilted fiber bragg grating mechanical vibration sensing array and the great-angle tilted fiber bragg grating mechanical vibration sensing system can be widely used in the fields of optical fiber perimeter and structural safety monitoring, landslide early warning and the like.

A chemical and biological transducer is prepared by setting long period fibre grating, reflecting film on fibre section, fibre covering, fibre core and metal film on fibre covering surface on one piece of fibre to SPR transducer of fibre Michelson interferometer structure. The sensing system comprises wide band light source, fibre, chemical and biological transducer prepared as above, wide band coupler, fibre spectrograph and computer.

The invention relates to a desalting device and process through a high-voltage capacitor adsorption method. The device comprises a reaction chamber and an external power source, wherein the reaction chamber is formed by a first side wall, a first detachable plate, a movable plate, a second detachable plate and a second side wall which are sequentially arranged, connected and fixed through iron rods with threads; an anode plate and a cathode plate are respectively arranged at opposite positions, close to the first and the second side walls, in the reaction chamber; metal screws are respectively arranged at middle positions of tops of the anode plate and the cathode plate and respectively connected with the anode and the cathode of the external power source; an anionic membrane and a cationic membrane are respectively arranged at opposite positions inside the anode plate and the cathode plate; a flow channel is formed between the anionic membrane and the cationic membrane; the movable plate is provided with a water inlet and a water outlet; and insulating treatment is carried out on surfaces of the electrodes. According to the process, salt-containing wastewater is put into a reactor; the electrodes at two ends are connected to the external direct-current power source; and the effluent water flows out via the water outlet on the top. According to the invention, insulated electrodes are adopted to replace traditional electrodes, so that the method can be implemented at high voltage.

The invention discloses a single tripolar synchronous switch-based intelligent reactive power compensation device, which is characterized in that: the input ends of main contacts of a tripolar synchronous switch K1 are connected with three phases of power grid voltages U, V and W respectively, and the output ends of the main contacts of the tripolar synchronous switch K1 are connected with a capacitor bank respectively; a pre-charging circuit 1 is connected in parallel between the input end and output end of a main contact; a pre-charging circuit 2 is connected in parallel between the input end and output end of another main contact; the line voltage of a power grid pre-charges the capacitor group through the pre-charging circuits 1 and 2; a phase control device switches on and switches off the three main contacts of the tripolar synchronous switch K1 at the same time according to the preset phase angle of the voltage of the power grid to switch the capacitor group. Experimental waves show that the device is good in switching electrical effect, environment-friendly, energy-saving, simple in structure, economical and practical, and can be conveniently applied to engineering in a large scale.

The invention provides an electrified railway external power grid power supply structure. An external power grid comprises transformer substations and power transmission lines; the A-type transformer substation supplies power to the B-type transformer substation, the C-type transformer substation and the traction transformer substations through the corresponding power transmission lines, the B-type transformer substation supplies power to the C-type transformer substation and the traction transformer substations through the corresponding power transmission lines, and the C-type transformer substation supplies power to the traction transformer substations through the corresponding power transmission lines; it is defined that the traction transformer substations serve as leaves, the A-type transformer substation serves as a root, the B-type transformer substation and the C-type transformer substation between the A-type transformer substation and the traction transformer substations serve as nodes; through the power transmission lines, the A-type transformer substation, the B-type transformer substation, the C-type transformer substation and the traction transformer substations are connected into a tree-shaped-structure power supply network from the high-voltage level to the low-voltage level; as long as every two adjacent traction transformer substations (leaves) upwards retrospect and can find the same node or root, the intervening subarea substations can communicate, cut-through power supply is implemented, and an equalizing current cannot be generated; and every two corresponding power transmission lines are arranged into one set, capacity standby application is conducted, and traction power supply is not affected under overhauling or breaking down of bus bars of any power transmission line and transformer substation subsection.

The invention relates to a failure detection instrument for intelligent inspection of a fire-fighting inspection cabinet. The failure detection instrument comprises a single chip microcomputer, a three-phase undervoltage / overvoltage detection module used for detecting that whether the power circuit of the fire-fighting inspection cabinet is undervoltage / overvoltage or not and for sending failure signals to the single chip microcomputer, a three-phase overcurrent / overload detection module used for detecting that whether the load is overcurrent / overload or not and for sending failure signals to the single chip microcomputer, a circuit current leakage detection module used for outputting signals to the single chip microcomputer when leaking current of a load circuit exceeds a setting valve, and an external inspection module which can stop inspection when the single chip microcomputer receives a failure signal and outputs the detected failure to an external text to record the name and the time of the failure and give an acousto-optic alarm; when a fire signal is received during inspection, the inspection process of the single chip microcomputer is stopped, and a fire extinguishing process is started to achieve the function of fire fighting priority. The failure detection instrument can accomplish variable-frequency intelligent low-velocity automatic inspection control of a fire pump and a sprinkle pump and has the functions of giving out sound and light alarms and memorizing failures.

The invention provides a low-voltage intelligent synchronous switch. The switch comprises a control module, a current detection module, a voltage detection module, an input module, a zero-crossing switching module, a communication module, a power module, and a display module. The control module is connected with other seven modules. The power module is connected with the zero-crossing switching module, the communication module, and the display module. Through cooperation of the zero-crossing switching module and the control module, the switch can be switched to a capacitor or an AC power switch on a zero-crossing point, realizing switching-in of the capacitor on a voltage zero-crossing point and switching-off on a current zero-crossing point. In a switching process, the switch has no inrush current, no electric arc, and switch contacts are not damaged. The switch has no inrush current in switching, contacts do not sinter, and the switch is small in volume, low in energy consumption, and does not lead in transient state and harmonic waves. The switch can adapt to various extreme cold extreme hot harsh environment, and can satisfy various occasions of reactive capacity requirements.

The invention relates to an intelligent monitoring integrated power distribution cabinet which is applied to a power distribution system. According to the intelligent integrated power distribution cabinet, a current measuring mutual inductor, a power distribution equipment working condition on-line detecting terminal, an intelligent reactive power compensation capacitor and a magnet-holding non-voltage contactor are mounted on a metal outer shell control box according to a specified low-voltage apparatus mounting wiring standard, a wireless communication module is matched with the power distribution equipment working condition on-line detecting terminal to be arranged, and the power distribution equipment working condition on-line detecting terminal comprises an electric energy measuring module, a single chip microcomputer module, a power parameter collecting module and a harmonic signal detecting module. The power distribution cabinet is connected with a mobile communication base station and a front end computer through a wireless module and an optical fiber module, and uploading and receiving of power parameter data, early warning information and monitoring orders are achieved. The problems that a traditional power distribution system is high in operation loss, low in automatic degree, not reliable in power supply, poor in power supply quality and the like in operation are solved, and a good basis is laid for achieving intelligent monitoring management of the power distribution system.

The invention discloses a method and device for evaporating water and liquefying water vapor. Water evaporates on the evaporation / liquefaction layer, or when the water vapor in the gas contacting the evaporation / liquefaction layer is saturated, the water vapor evaporates / liquefies Liquefaction on the layer; the evaporation / liquefaction layer is the water-absorbent layer or the water-wettable layer, the water is immersed in the water-absorbent layer or distributed on the surface of the water-wettable layer, the thickness of the water-absorbent layer or the water-wettable layer The thickness of the water layer on the surface is below 2mm. The present invention has various functions such as cooling, heat dissipation, heating, heat absorption, moisturizing, moisture absorption, negative ion generation, pure water production, extraction of soluble matter in water, air filtration, and power generation. Water just works. The water and moisture mentioned in the present invention can be any liquid and gas, as long as it has the characteristics of evaporation and liquefaction.

The invention provides a dynamic reactive power compensation device of a line thyristor switching capacitor, comprising a thyristor switching capacitor group, an external current transformer, a programmable controller and an output transformer, wherein the thyristor switching capacitor group and the external current transformer are both connected with the programmable controller; the thyristor switching capacitor is connected with the output transformer in series; and the external current transformer and the output transformer are both connected with a power system in parallel. In the dynamic reactive power compensation device of a line thyristor switching capacitor, low-voltage dynamic reactive power compensation is combined with the boost output transformer technology, the working can be completely and automatically performed to ensure that a switching capacitor does not have the processes of impacting, inrush current and transition, the line electric force quality can be effectively improved, the energy is saved, the power supply environment is purified, a power factor is improved, the electric charges are saved, and the problems of three-phase balance and reactive power for a power-supply voltage can be solved.

The invention discloses a manhole cover breakage detection device and a detection method thereof. According to the manhole cover breakage detection device, detection lines are arranged in a concentriccircle manner from an external connection interface to an internal part; the heads and the tails of adjacent concentric circle detection lines are connected to form cambered surfaces, the detection line at the innermost layer is bend to form an inflection point, and another external connection interface is ensured to be at the external side of a top point of an outermost layer cambered surface; acircuit is composed of a sensor, a PMOS tube, and a voltage source VCC through series connection; an external interface of the sensor is connected with the voltage source VCC, and another external interface is connected with a grid G of the PMOS tube; a source electrode S of the PMOS tube is connected with the voltage source VCC; the grid G of the PMOS tube is connected with the ground through andiode D1; the cathode of the diode D1 is arranged to be upward; one circuit of the drain electrode D of the PMOS tube is connected with the ground through a diode D2, and another circuit is connectedwith an external schmitt trigger. The manhole cover breakage detection device is capable of saving cost, and realizing real-time detection, and is accurate in detection.

The invention belongs to the technical field of injection molds, and particularly relates to an injection mold side edge deep barb demolding mechanism. The mechanism comprises a base, the base is movably connected with a lower mold base, the lower mold base assists an upper mold base to conduct mold closing injection molding work on a deep barb mold, the base is rotationally connected with a supporting rod, one end of the supporting rod is in threaded connection with the lower mold base to realize mold closing and demolding work of the lower mold base and the upper mold base, the other end of the supporting rod is in threaded connection with a top plate, and the top plate performs ejection demolding work on the deep barb mold through the supporting rod. By arranging the supporting rod with two-way threads, demolding of the upper mold base and the lower mold base and ejection demolding of the deep barb mold can be conducted at the same time in the demolding process of a mold, a transmission mechanism can eject out a core pulling block in the demolding process of the lower mold base, the demolding effect of the deep barb mold is improved, the core pulling block can pull a ceramic electric sheet in the ejection process, so that a movable block is magnetically absorbed back, and the demolding work of the deep barb mold is facilitated.

The invention discloses a water evaporating method and device. The water evaporator method comprises the following steps: conveying water to an evaporating layer through a capillary structure; and keeping the thickness of a water layer in the evaporating layer below 1mm, wherein water is evaporator on the evaporating layer; the evaporating layer is a water absorbing material layer or a soaking material layer, water permeates the water absorbing material layer or infiltrates the surface of the soaking material layer, and the thickness of the water absorbing material layer or the thickness of the water layer on the surface on the soaking material layer is below 1mm. The method and device provided by the invention have various functions of reducing temperature, dissipating heat, keeping moisture, absorbing moisture, generating negative ions, generating distilled water and the like; the device is simple to arranged and convenient to maintain; the energy consumption cannot be consumed, andthe device can operate if water is available.

The invention relates to thyristor throw-in and throw-off capacitor no-delay zero-crossing trigger circuit, that provides features of good trigging characteristic, lower power consumption and withoutinfluencing the trigging voltage of thyristor itself. The photo-coupler input end of main control and a limiting resistor are connected in series and across input ends of DC source. The photo-coupleroutput end of main control is connected to the photo-coupler input end that turns on at positive half cycle as well as a limiting resistor in series, then the input end of AC source is out. Main control loop is composed of dc power source, the photo-coupler output and input end. Two AC input ends are connected to diode and photo-coupler output end that turns on at positive half cycle as well as aphoto-coupler input end and photo-coupler output end that turns on at negative half cycle, then the triggering end of the invented circuit is led out.

The invention discloses an unbalanced low voltage control device, which comprises a transmission line, a measurement and control terminal, a signal acquisition module, a communication module, a man-machine interface, a data storage module, an unbalanced compensation module and a voltage regulating module. The transmission line comprises a detection line, a compensation line and a voltage regulating line which are connected sequentially by linkage switches. The measurement and control terminal is connected with the detection line through the signal acquisition module which acquires voltage andcurrent signals. The measurement and control terminal is connected with the voltage regulating module arranged on the voltage regulating line through a communication interface. The unbalance compensation module is arranged between the measurement and control terminal and the voltage regulating module and is connected with the compensation line. Due to plug-and-pull connection among the unbalancedcompensation module, the voltage regulating module and the measurement and control terminal, fast connection is realized, the modules operate parallelly, and equipment capacity expansion is realized in a simple environment; and multiple zero line compensation capacity is achieved, zero line current is eliminated, line loss is reduced, and functions of three-phase unbalance control and low voltagecontrol can be realized.

The invention relates to an electric split-phase non-interruption flexible connection-compensation device and method for a traction electric network, belonging to the technical fields of railway transportation equipment and electric power and electronics. The device comprises a two-phase back-to-back converter set and three position sensors, wherein the two-phase back-to-back converter set comprises two single-phase converter sets Va and Vb sharing a DC side capacitor set, and two single-phase reduction transformer sets Ta and Tb respectively connected with AC sides of the two single-phase converter sets Va and Vb, or a single-phase reduction transformer set Ta or Tb connected with the AC side of the single-phase converter set Va or Vb, and also comprises three electric quantity sensors, a killer switch, a controllable fling-cut switch and a main controller. The device can work in two modes, and realizes that an electric locomotive passes through split phases without interruption and with loads. The device has functions of active power transfer, reaction power compensation and harmonic compensation, and can solve the problems of three-phase voltage imbalance, voltage fluctuation, low power factor, harmonic pollution and the like in a traction substation.

The invention discloses an intelligent dynamic reactive compensation device which is mainly used for solving the problem existing in the prior art that a compensation device can not quickly and effectively switch a filter capacitor reactor group to filter out harmonic waves in a system. The intelligent dynamic reactive compensation device comprises a cabinet, and also comprises a dynamic compensation controller, a thyristor switching switch, a filter reactor and a filter capacitor which are arranged in the cabinet and successively connected. By adopting the scheme, the intelligent dynamic reactive compensation device disclosed by the invention achieves the aim of effectively filtering out harmonic waves in the system, is safe and reliable, has great practical value and is very worthy of being generalized.

The invention provides real-time solution detection equipment and a real-time solution detection method, the real-time solution detection equipment is externally connected with an electromachining system or a waste liquid treatment system, the real-time solution detection equipment comprises an equipment shell, a controller, a solution detection system, a liquid conveying system and a liquid return system, the liquid return system and the liquid conveying system are both provided with distribution filling type peristaltic pumps, and the solution detection system is provided with a heat exchange cooling pipe. The phenomenon that a detection sensor is damaged due to direct measurement in the electromachining solution containing current is avoided, parameters of the electromachining solution can be continuously, accurately and effectively detected on line in real time so that the parameters can be adjusted in time when deviating, it is guaranteed that the production process is stable and controllable, and the precision of the electromachining solution is improved; the equipment and method can be applied to industrial production, improve the production quality, can also be applied to scientific research experiments, and provide an experiment detection platform for research of a processing mechanism; and waste liquid generated after processing can be discharged after treated effluent waste liquid reaches the standard, and environmental pollution caused by poor treatment is avoided.

The invention provides a voltage regulation tap switch and a usage method of the voltage regulation tap switch. According to the invention, in the voltage regulation tap switch, a thyristor is connected to a magnetic latching switch. By means of the voltage regulation tap switch provided with the thyristor, the problem that in the related art, an on-load tap switch is prone to being impacted and damaged is solved. The damage to the thyristor is avoided. Meanwhile, in the voltage regulation switching process, no inrush current is generated, and the operation overvoltage is avoided.

The invention discloses a filter compensation module which is mainly used for solving the problems existing in the prior art that compensation apparatuses are unitary in structure, devices are fixedly mounted, the space utilization rate is not high, the compensation way can not be flexibly changed or the compensation capacity can not be increased or decreased, and the repair and maintenance of equipment by owners independently are not facilitated. The filter compensation module comprises a thyristor switching switch, a filter reactor and a filter capacitor which are successively connected. By adopting the scheme, the filter compensation module disclosed by the invention can be used for achieving the aim of effectively filtering out harmonic waves in a system and being safe and reliable, and the filter compensation module has great practical value and is very worthy of being generalized.

The invention discloses a bothway voltage reactive adjusting device, and relates to a high voltage bus. The bothway reactive voltage adjusting device comprises a transformer, an on-load tap-changer, a first circuit breaker, a second circuit breaker, a capacitor bank, an electric reactor, a current transformer, a voltage transformer and a controller. A tap on the transformer is electrically connected with the on-load tap-changer which is electrically connected with the first circuit breaker and the second circuit breaker, the first circuit breaker is electrically connected with the electric reactor, the second circuit breaker is electrically connected with the capacitor bank, the controller is electrically connected with the on-load tap-changer, the first circuit breaker, the second circuit breaker, the current transformer and the voltage transformer, and the on-load tap-changer, the current transformer and the voltage transformer are electrically connected with the high voltage bus. The bothway reactive voltage adjusting device is simple in structure, capable of achieving bothway reactive voltage adjusting, free of flashy flow and current impact, accurate in voltage controlling, capable of effectively improving the voltage stability and the percent of pass of a partial electric network, and capable of enabling a power distribution system to be safer and more stable.

The present invention provides a heat conduction vacuum gauge based on a fluorescence method, and is used for measuring air pressure and vacuum degree in a vacuum chamber, the vacuum gauge comprises avacuum gauge housing (1), a fluorescent material (2) disposed within the vacuum gauge housing, and an optical probe (3), wherein the optical probe (3) is disposed spacing apart from the fluorescent material (2), wherein, in an operating state, the fluorescent material (2) is excited to emit fluorescence, the optical probe (3) receives the fluorescence and transmits to the transmitter (5) throughan optical fiber (4), and the transmitter (5) calculates the vacuum degree. The optical probe and the fluorescent material used in the vacuum gauge can have a very small geometric size, a small corresponding heat capacity, and high measurement responsivity, and are advantageous for miniaturization and integration. The vacuum gauge has the advantages of a simple structure, convenient use, accuratemeasurement and a high commercial value.

The invention discloses an integrated controlled system and an integrated controlled method for dynamic reactive power compensation based on a touch screen, a PLC and a DSP. The system consists of an integrated control arithmetic unit, a TSC and an HVC. The control method comprises the following steps: firstly acquiring the voltage and current of a three-phase power grid and receiving related parameters from the touch screen; computing reactive capacity required by the system at the moment according to a instantaneous reactive power theory and utilizing the PLC to check a target power factor to obtain a most rational compensation loop combination plan; and finally utilizing thyristor cross-zero trigger technology to control a corresponding compensation loop for switching. The system and the method effectively solve the problems that the conventional compensation system cannot perform frequent switching and is low in response speed, low in compensation accuracy and the like, and greatly improve the stability of the system and reduce the running cost simultaneously.

The invention provides an intelligent commutation control device and a commutation control method. A processor is used for receiving a three-phase voltage signal and a three-phase current signal, transmitted by an analog input model, of a power distribution network, and the three-phase voltage, load current amplitude and a phase are calculated by a half-wave Fourier transformation algorithm to achieve functions of measurement displaying, communication and remote transmission; after a commutation instruction emitted from an area control terminal is received, a voltage sampling waveform and a current sampling waveform are judged in real time, and a commutation control module is controlled to emit the commutation instruction to achieve commutation action; after the commutation action is completed, an operation result is uploaded to the area control terminal by a carrier communication module; and the commutation control module is used for controlling an electronic commutation switch to execute phase action according to the commutation instruction emitted by the process. By the intelligent commutation control device and the commutation control method, a intelligent seamless commutation technology is achieved, a voltage phase zero-cross point and a current phase zero-cross point are traced in real time during the whole processes of commutation instruction receiving and commutation completion, the switching operation consumes short time and is reliable, and moreover, no commutation overlap is ensured.

The invention provides a low-voltage intelligent synchronous switch. The switch comprises a control module, a current detection module, a voltage detection module, an input module, a zero-crossing switching module, a communication module, a power module, and a display module. The control module is connected with other seven modules. The power module is connected with the zero-crossing switching module, the communication module, and the display module. Through cooperation of the zero-crossing switching module and the control module, the switch can be switched to a capacitor or an AC power switch on a zero-crossing point, realizing switching-in of the capacitor on a voltage zero-crossing point and switching-off on a current zero-crossing point. In a switching process, the switch has no inrush current, no electric arc, and switch contacts are not damaged. The switch has no inrush current in switching, contacts do not sinter, and the switch is small in volume, low in energy consumption, and does not lead in transient state and harmonic waves. The switch can adapt to various extreme cold extreme hot harsh environment, and can satisfy various occasions of reactive capacity requirements.

The invention provides a negative electrode piece of a sodium ion battery, an electrochemical device and electronic equipment, the negative electrode piece comprises a negative electrode current collector, a carbon material coating formed on at least part of the surface of the negative electrode current collector, and a sodium metal layer formed on at least part of the surface, far away from the negative electrode current collector, of the carbon material coating, the thickness of the carbon material coating is smaller than or equal to 10 microns, the carbon material coating comprises a carbon material and a polymer binder, the carbon material comprises oxygen-containing groups, and the mass content of oxygen atoms in the carbon material is larger than or equal to 0.1%. According to the negative pole piece of the sodium ion battery provided by the invention, when the negative pole piece is charged for the first time, the metal sodium is deposited on the surface of the negative current collector, the metal sodium formed by deposition can be attached to the carbon material coating on the surface of the negative current collector, and the carbon material coating can effectively reduce the overpotential of sodium metal deposition and inhibit the formation of sodium dendrites; and the cycle performance of the battery is improved.