327 results about "Short-circuit test" patented technology

An open and short circuit testing device and method. The device comprises a base (1), a support frame (2), a test board (5) and a placement frame (4). The test board (5) is slidably connected to the side opposite to the support frame (2), and the test board (5) moves downwards to drive a gear (14) to rotate; a limiting plate (17) is used for limiting reverse rotation of the gear (14); and a probe (26) is used for connecting to a circuit board to achieve testing. Under normal conditions, the friction force when the probe (26) is inserted into a wiring terminal (29) is less than the minimum elastic force of a second spring (25), when the probe (26) fails to be normally connected to the wiring terminal (29), the probe (26) is pressed downwards when a movable plate (23) moves downwards, the probe (26) is adjusted by means of the second spring (25) at the top of the probe (26), so that the probe (26) returns to normal, the pressure sensor (31) detects whether there is an abnormality, and when the second spring (25) at the top of the probe (26) is compressed, the pressure sensor (31) at the top of the second spring (25) measures an excessively large pressure value, i.e., indicating that a device abnormality occurs during the testing process rather than representing that there is necessarily a problem with the circuit board to be tested itself, thereby improving the accuracy of the testing result.

The invention belongs to the technical field of battery detection, and particularly relates to a new energy power battery short circuit test cabinet, which comprises an explosion-proof cabinet, the explosion-proof cabinet is provided with a transmission cabin and a test cabin, and a transmission system, a termination system and a power-on system are arranged in the transmission cabin. In order to avoid deflagration of a circuit in a test process and reduce damage to detection equipment, an impact transmission system and a termination system are arranged, a mechanical transmission mode is utilized, short-circuit wiring of a battery is immediately interrupted when the battery explodes, impact force generated by explosion is directly converted into mechanical action, a signal conversion process is not needed, and the detection efficiency is improved. Compared with the prior art, the device has the advantages of higher response speed, higher extreme environment resistance and lower manufacturing cost, and can effectively reduce the damage of explosive shock waves to the test cabin in the test process.

The invention provides an arc resistance characteristic-based segmented modeling method of a fuse for a direct current networking system, and relates to the technical field of common direct current bus system design, and the method comprises the steps: calculating the real-time arc resistance data of the fuse according to the continuously collected short-circuit voltage and short-circuit current at the two sides of the fuse in a short-circuit test process, and forming an arc resistance curve; intercepting an arc resistance curve from the peak moment of the short-circuit current to the slope descending moment of the arc resistance curve to obtain an arc starting stage arc resistance curve, and intercepting an arc resistance curve from the slope descending moment to the moment when the short-circuit current is zero to obtain an arc burning stage arc resistance curve; respectively carrying out data fitting according to the arc starting stage arc resistance curve and the arcing stage arc resistance curve to obtain a sectional arc resistance curve equation; and taking the arc resistance curve equation as a control signal to build and obtain a fuse simulation model based on the controlled resistor. The method has the advantages that the arc resistance curve is divided into two sections, the corresponding arc resistance curve equation is designed, the simulation precision is higher, and the method can be better suitable for different working conditions.

The invention relates to the technical field of lithium ion batteries, in particular to a composite positive pole piece, a preparation method of the composite positive pole piece and a lithium ion battery, the composite positive pole piece comprises a positive current collector, a negative current collector, a positive electrode and a negative electrode, and the positive current collector is provided with two opposite surfaces; the positive electrode active material layer is arranged on at least one surface of the positive electrode current collector; and the solid electrolyte layer is arranged on the positive electrode active material layer. According to the lithium ion battery, the solid electrolyte layer is arranged on the positive active material layer, so that the battery can pass needling, overcharge and short-circuit test inspection, and the use safety of the lithium ion battery is comprehensively improved.

The invention provides a biphase composite magnetic material magnetically controlled reactor electromagnetic transient simulation method, device and equipment and a medium, and relates to the technical field of power equipment magnetic material testing and electromagnetic transient simulation. According to the invention, the test winding is arranged on the excitation winding of the magnetically controlled reactor, and multi-dimensional means of obtaining total iron loss through an open circuit test, obtaining magnetic hysteresis loss through a frequency reduction test, obtaining copper loss and leakage reactance through a short circuit test and the like are combined, so that separation of magnetic hysteresis loss, eddy current loss and additional loss can be realized; a high-fidelity hysteresis loop and a magnetic conductivity change rule are obtained, and the nonlinear characteristic and hysteresis response of the magnetic core can be accurately captured, so that the predictive capability of equipment performance and the sensing capability of an operation state are improved.

The embodiment of the invention discloses a probe card OS test device and a test method. The device comprises: a base; the probe card mounting assembly is mounted on the base; the movable carrying table is mounted on the base, and a conductive block and an insulating block are arranged on the movable carrying table; the movable carrying table is configured to drive the conductive block and the insulating block to move, so that the conductive block or the insulating block is in contact with each probe of a probe card on the probe card mounting assembly to form a plurality of test paths in one-to-one correspondence with the probes or to enable the top ends of the probes to be mutually insulated; and the open / short circuit test module is respectively connected with the conductive block and each probe of the probe card, and the open / short circuit test module is configured to be conducted with the test path or each probe according to a preset mode so as to carry out open / short circuit test on each probe of the probe card. According to the embodiment of the invention, the open / short circuit test of each probe of the probe card is realized.

The invention belongs to the field of battery short-circuit protection, relates to a data analysis technology, and aims to solve the problem that the short-circuit protection response performance of a battery in the charging and discharging process cannot be tested and analyzed in the prior art, in particular to a short-circuit protection response monitoring and control system based on battery charging and discharging, which comprises a monitoring and control platform, the monitoring control platform is in communication connection with a short circuit test module, an evaluation analysis module, an optimization processing module and a database; the short-circuit test module is used for performing short-circuit test analysis on the battery: marking the battery subjected to the short-circuit test analysis as a test object, and performing a charging response test and a discharging response test on the test object in sequence to obtain response data; according to the invention, short-circuit test analysis can be carried out on the battery and response data can be obtained, short-circuit protection response performance of the charging loop and the discharging loop can be fed back according to the charging response value and the discharging response value in the response data, and data support is provided for the evaluation and analysis process.

The invention discloses a method for calculating equivalent circuit parameters of a double-current-system multi-winding traction transformer, which comprises the following steps of: constructing a full-size equal-scale model of the double-current-system multi-winding traction transformer, and establishing a finite element calculation model; according to the finite element calculation model, inductance matrixes formed among the I-type winding, the II-type winding and the III-type winding under the two power supply modes of 25kV / 50Hz and 15kV / 16.7 Hz are calculated respectively; based on the formed inductance matrix, establishing a transformer multi-winding equivalent model, and considering circulating current influence caused by internal parallel connection of the I-type winding to obtain actual current sequences of the windings under short-circuit tests between the I-type winding and the III-type winding, between the I-type winding and the II-type winding and between the II-type winding and the III-type winding; according to the obtained actual current sequence of each winding, the short-circuit impedance between the I-type winding and the III-type winding, the short-circuit impedance between the I-type winding and the II-type winding and the short-circuit impedance between the II-type winding and the III-type winding are calculated through an energy method; and obtaining equivalent circuit parameters of the transformer according to the obtained short-circuit impedance value.

The invention discloses a high-frequency transformer high-frequency oscillation analysis method and system considering stray parameters of a power supply line under high-frequency square wave excitation. According to the method, an open-circuit and short-circuit test means is adopted to obtain impedance parameters of the high-frequency transformer, and distribution parameters such as power supply line resistance, parasitic inductance and parasitic capacitance of the high-frequency transformer are obtained through impedance characteristic test. On this basis, a distribution parameter model of the high-frequency transformer is constructed, and order reduction splitting is performed on the distribution parameter model on the premise of neglecting capacitance between windings, so that a low-order sub-circuit model easy to analyze is formed. And the equivalent distribution parameter sub-circuit model obtained through reduced-order splitting is utilized to analyze and calculate the response of the transformer port voltage and the winding current under high-frequency square wave excitation, and detailed analysis of the waveform of the high-frequency transformer and research of the high-frequency oscillation characteristic are realized. The method can quantify the specific influence of the parameters of the high-frequency transformer on the oscillation characteristics, provides guidance for the suppression and elimination of high-frequency oscillation, and guarantees the efficient and stable operation of the high-frequency transformer.

The utility model relates to the technical field of electronic testing, in particular to a test probe. The test probe is used for detecting a tested product, the test probe comprises a plurality of contact parts, the plurality of contact parts are located at one end of the test probe, and the plurality of contact parts can be contacted with the tested product at the same time. The contact area between the test probe and the tested product during the open and short circuit test is increased, and the good contact between the test probe and the tested product (such as an FPC extension socket) is realized, so that the high misjudgment rate of the open and short circuit test is improved, and the production efficiency of equipment is improved.

The invention relates to the technical field of batteries, and provides a battery short-circuit testing device and a battery short-circuit detection method, and the method comprises the steps: obtaining a current signal and a voltage signal in a battery operation process, carrying out the de-noising processing, obtaining a de-noised current signal and a de-noised voltage signal, and constructing a current and voltage dynamic characteristic spectrum; generating a short-time current and voltage characteristic mapping matrix, and performing hierarchical clustering analysis on the short-time current and voltage characteristic mapping matrix to obtain a short-circuit evaluation result; and comparing the short-circuit assessment result with a preset risk degree, and if the short-circuit trend of the short-circuit assessment result exceeds a preset safety range of the risk degree, generating a short-circuit alarm signal. The current signal and the voltage signal are processed and analyzed, the detection threshold value is dynamically adjusted to adapt to different use environments, the detection sensitivity and accuracy are enhanced, and the problems that the threshold value adaptability is poor, and the false alarm or missing alarm phenomenon is likely to be caused when the battery is in different use environments and battery types are solved.

The invention discloses a stepped steady-state thermal safety test method and device for a lithium ion battery after fast charging circulation, and relates to the technical field of battery test.The method comprises the steps that lithium ion battery samples after fast charging circulation are obtained, and the lithium ion battery samples are grouped; carrying out a stepped steady-state thermal test on a first group of the lithium ion battery samples to obtain temperature change data and voltage change data of the lithium ion battery samples in the stepped steady-state thermal test; performing a short-circuit test on a second group of the lithium ion battery samples to obtain heating data and spark phenomenon data of the lithium ion battery samples in the short-circuit test; according to the temperature change data and the voltage change data of the stepped steady-state thermal test, judging the thermal safety performance of the lithium ion battery sample in the stepped steady-state thermal test; according to the heating data and the spark phenomenon data of the short circuit test, judging the thermal safety performance of the lithium ion battery sample in the short circuit test; and generating a thermal safety evaluation report of the lithium ion battery sample by integrating thermal safety performance judgment results of the stepped steady-state thermal test and the short-circuit test.

The invention relates to a battery short circuit test tool detection circuit, which comprises a tested BMS board, an air switch and a short circuit test tool, and is characterized in that the short circuit test tool comprises a test switch module, a control module, a switch driving module and a switch management module; the tested BMS board, the air switch and the switch management module are connected in series to form a detection loop, the signal output end of the test switch module is connected with the signal input end of the control module, and the signal output end of the control module is connected with the signal input end of the switch driving module. The signal output end of the switch driving module is connected with the signal input end of the switch management module; complex operation of manually building a short-circuit environment in a traditional manual testing process is avoided, so that the testing result is more stable and reliable, personal errors are reduced, and the accuracy of product quality detection is improved.

The invention provides welding equipment for a cylindrical battery cell collector plate. Comprising a first magnetic drive line, and a battery cell feeding mechanism, a battery cell code scanning mechanism, a first collector plate welding mechanism, a battery cell overturning mechanism, a second collector plate welding mechanism, a short circuit testing mechanism, a pressing mechanism, a length detection mechanism, a dust removal mechanism, a battery cell detection mechanism and a battery cell discharging mechanism which are sequentially arranged in the conveying direction of the first magnetic drive line, wherein the first magnetic drive line comprises a plurality of first rotors, battery cell clamps are assembled on the first rotors, and the first rotors bear battery cells from the battery cell feeding mechanism; and the battery cell passes through the battery cell code scanning mechanism, the first collector plate welding mechanism, the battery cell overturning mechanism, the second collector plate welding mechanism, the short circuit testing mechanism, the pressing mechanism, the length detection mechanism, the dust removal mechanism and the battery cell detection mechanism in sequence to the battery cell discharging mechanism to complete welding and detection work of the positive collector plate and the negative collector plate of the battery cell. The system is high in integration level, and facilitates the improvement of the working efficiency.

The invention discloses a battery short circuit test parameter determination method and device and computer equipment. The method comprises the following steps: acquiring test data of diaphragm breakdown voltage of a sample battery; initially setting initial short-circuit test parameters according to the test data of the diaphragm breakdown voltage; based on the initial short-circuit test parameters, performing short-circuit test on the verification battery to obtain short-circuit test data of the verification battery; whether the short-circuit test data meet preset verification conditions or not is judged, and the verification conditions are used for verifying the reasonability of the short-circuit test parameters; and taking the initial short-circuit test parameter as a target short-circuit test parameter under the condition that the short-circuit test data meets a preset verification condition. According to the invention, the technical problems of strong dependency and low reliability of battery short circuit test parameter setting experience are solved.

The invention discloses laser diaphragm cutting equipment, and relates to the technical field of lithium battery manufacturing, and the laser diaphragm cutting equipment comprises a laser cutting part which comprises a first laser cutting device and a second laser cutting device which are sequentially arranged along the diaphragm conveying direction, the first laser cutting device is used for diaphragm cutting of a left battery cell, and the second laser cutting device is used for diaphragm cutting of a right battery cell; the detection part comprises a visual detection device and a short-circuit testing device which are sequentially arranged in the diaphragm conveying direction, and the visual detection device and the short-circuit testing device are both arranged on the downstream of the second laser cutting device; and the rotating disc assembly is used for bearing the diaphragm, and the diaphragm is switched and conveyed between the laser cutting part and the detection part through the rotating disc assembly. The working efficiency of diaphragm cutting is improved in a laser mode, the problem that due to cutting of an existing metal cutter, diaphragm sticking to the cutter is brought up, and material blockage is caused seriously is solved, tools do not need to be replaced, the production cost is reduced, and meanwhile the diaphragm cutting quality is guaranteed.

The invention relates to a high-efficiency ceramic chip on-short circuit test tool which comprises a workbench, a feeding assembly is arranged on one side of the workbench, the feeding assembly comprises a feeding conveyor belt obliquely arranged on the workbench, a containing groove is formed in one side of the feeding conveyor belt, a buffer assembly is arranged in the containing groove, and a discharging conveyor belt is arranged on one side of the containing groove. A detection assembly and a hydraulic assembly driven by the detection assembly are arranged above the containing groove, the hydraulic assembly comprises a hydraulic cylinder, the hydraulic cylinder is connected with an adsorption assembly, the feeding assembly is used for conveying ceramic chips into the containing groove through a feeding conveying belt, and the buffering assembly is used for buffering the ceramic chips when the detection assembly detects the ceramic chips. The hydraulic assembly is used for enabling hydraulic oil in the hydraulic cylinder to drive the adsorption assembly to adsorb the ceramic chips to the discharging conveying belt for discharging while the detection assembly completes detection rising, the effects of automatic feeding and discharging and efficient detection are achieved, and the enterprise equipment cost is reduced.

A method includes connecting an output of a switched capacitor converter to a battery, the switched capacitor converter comprising a first switch, a second switch, a third switch and an upper circuit connected in series, and a flying capacitor connected between a common node of the first switch and the second switch, and a common node of the third switch and the upper circuit, in a first short circuit testing step, determining whether the third switch is shorted by comparing a voltage on the common node of the third switch and the upper circuit with a first predetermined voltage reference, and in a second short circuit testing step, determining whether the first switch and the second switch are shorted by comparing a voltage on the common node of the first switch and the second switch with a second predetermined voltage reference and a third predetermined voltage reference, respectively.

The utility model relates to a pre-failure short circuit testing device for a gapless metal oxide arrester, which is characterized in that voltage is continuously applied to a to-be-tested arrester, and voltage at two ends of the arrester and current flowing through the arrester are monitored at the same time until the to-be-tested arrester reaches a pre-failure testing device. Through the testing device with a simple structure, the testing requirement of lightning arrester pre-failure short circuit in the international standard IEC 60099-4 is met; meanwhile, one testing device can meet the requirements of to-be-tested lightning arresters of different specifications.

A display panel includes: a display panel test circuit including an open-short test transistor including a gate electrode receiving a test gate signal, a first electrode receiving an open-short test voltage, and a second electrode connected to a data line transmitting a data voltage; and an electrostatic discharge protection circuit including: a first electrostatic discharge diode including a cathode electrode connected to the data line and an anode electrode receiving a first voltage; a first switching element that determines a minimum voltage of the display panel as a first voltage under a first condition, and determines an electrostatic discharge low potential voltage higher than the minimum voltage of the display panel as the first voltage under a second condition; and a second electrostatic discharge diode including a cathode electrode receiving the second voltage and an anode electrode connected to the data line.

The invention provides a chip reliability test device and method, and the device comprises a test controller and a serial port output module which are electrically connected. The test controller is electrically connected with the tested chip, and the serial port output module is electrically connected with the test controller; the test controller is used for analyzing the received test program file and obtaining a corresponding test mode, and sending the obtained test mode to the tested chip so as to carry out an open / short circuit test on each pin of the tested chip; the test controller is also used for sending the test process information and the test result to the serial port output module; wherein the test mode comprises an open-short circuit pin test mode, and the test result comprises an open-short circuit test result of the tested chip; and the serial port output module is used for outputting the test process information and the test result information. According to the invention, manpower and time cost can be obviously saved, and the chip reliability test efficiency is improved.

The invention relates to a quick open and short circuit test dichotomy between any points of an IC wafer disc. A wafer bonding pad test channel is established based on a case board card framework, a test point TP corresponding to a wafer bonding pad is connected to N test unit board cards through a switch matrix, a connector and a carrier, and a power supply and communication link is formed by a backboard and a core control board. Each test unit board card executes an in-board dichotomy test and uploads an in-board open / short circuit initial determination result; the core control board executes an inter-board dichotomy grouping test on each slot position to determine a target board card set; and the test points TP of any two target board cards are divided into blocks and are positioned to the minimum block, point-to-point scanning is executed in the minimum block, and an open-short circuit positioning result is output. The method gives consideration to the configurable number of board cards and the multi-layer bipartite convergence path, and is suitable for the rapid open-short circuit positioning scene of the high-order-of-magnitude wafer bonding pad.

The utility model belongs to the technical field of testing, and provides a wire harness short circuit testing device. The wire harness short circuit testing device comprises a first indication module, a first switch module, a second switch module, a sliding module, a power supply, a first clamping arm and a second clamping arm, and the first switch module is connected with the first indication module, the sliding module and the negative electrode of the power supply. The sliding module is respectively connected with a positive electrode of the power supply and all tested wire harnesses on a vehicle, the second switch module is respectively connected with the first indication module and a first wire harness, the second clamping arm is arranged on the sliding module, the first clamping arm is used for fixing the first wire harness, and the second clamping arm is used for fixing the second wire harness. And the second clamping arm is used for fixing a target wire harness to be tested in all the wire harnesses to be tested. The wire harness short-circuit testing device provided by the utility model can ensure the preciseness and safety of the wire harness short-circuit test, and meanwhile, ensures that the test is not influenced by human factors.

The invention discloses grid-connected box short-circuit test equipment, and belongs to the technical field of grid-connected boxes. The device comprises a test box, a support is slidably mounted in the test box, the support is fixedly connected with a mounting plate, the mounting plate is provided with an isolation assembly, the mounting plate is fixedly provided with a sealing box through a thread assembly, the sealing box is fixedly connected with a double-shaft motor, and rotating shafts are symmetrically and rotatably connected in the sealing box. When short-circuit testing operation is carried out on the grid-connected box, key elements such as a circuit breaker in the grid-connected box are placed on the mounting plate, all the elements are isolated through the separating plate, damage to nearby elements when the elements are short-circuited and damaged is reduced, wires of the grid-connected box are placed in the sealing box, the heater is started, and the short-circuit testing operation is carried out on the grid-connected box. The temperature in the sealing box is improved, the use of the wire in a high-temperature irradiation environment is simulated, and the accuracy of a test result is further improved.

The invention provides an open / short circuit test circuit board and a switching circuit board. The open / short circuit test circuit board comprises at least one group of first multiplexers, first connectors, second connectors and third connectors, the first connector comprises first terminals in one-to-one correspondence with input pins of at least one group of first multiplexers, the input pins of the first multiplexers are connected with the corresponding first terminals, and the first terminals are also used for being connected with corresponding to-be-tested pins in a to-be-tested product; the second connector is connected with a control pin of the first multiplexer; the third connector comprises a second terminal and a third terminal, first output pins of the first multiplexers are connected with the second terminal, and second output pins of the first multiplexers are connected with the third terminal; and the at least one group of first multiplexers are used for selecting the input pins conducted with the second terminal and the input pins conducted with the third terminal according to the control signal, so that the test equipment performs open and short circuit test on the to-be-tested pins of the to-be-tested product.

The utility model relates to a conveying line square battery short circuit automatic detection device which is composed of a blocking and jacking positioning mechanism, a short circuit detection mechanism, a defective product removing mechanism and a classification caching mechanism, in the working process, a tray carries a square battery to a detection station, and after being blocked, the square battery is triggered to be jacked and positioned through photoelectric induction; the short-circuit detection mechanism is in contact with a battery through a probe, a PLC controls a short-circuit tester to complete detection, if a short circuit is found, the collaborative robot grabs defective products and places the defective products to the classification caching mechanism, and the tray is released after detection, the automation degree is high, safety accidents caused by the short circuit can be effectively prevented, the detection efficiency is greatly improved, the labor cost is reduced, and the reliability is high. An efficient and reliable solution is provided for short circuit detection of the square battery in the production, transportation and storage processes, and the method is suitable for the field of square battery production and logistics automation.

The invention discloses a high-density myoelectricity acquisition function test system and method, and relates to the field of test tools.The system comprises an analog multiplexer, a signal test module, a short circuit test module and an impedance test module; each channel of the analog multiplexer corresponds to each channel of the signal acquisition module or the impedance acquisition module; the signal test module is used for performing signal test on the signal acquisition module and judging whether the acquisition function of each channel of the signal acquisition module is normal or not; the short-circuit test module is used for realizing short-circuit test between adjacent channels of the signal acquisition module and judging whether the adjacent channels of the signal acquisition module are short-circuited or not; the impedance test module performs function test on the impedance acquisition module and judges whether the acquisition function of each channel of the impedance acquisition module is normal. The function test efficiency of the signal acquisition module and the impedance acquisition module is improved.

The present application belongs to the technical field of lithium ion battery detection, and particularly relates to a winding core short circuit test parameter optimization method, device and computer equipment. The winding core short circuit test parameter optimization method comprises the following steps: constructing a defect winding core sample library; taking voltage, plane pressure and test time as cooperative optimization parameters, performing full-factor experiments on the defect winding core sample library and normal control samples under different parameter combinations, obtaining a defect detection rate data set and a normal winding core damage rate data set; taking a defect detection rate not lower than a first threshold value and a normal winding core damage rate not higher than a second threshold value as an optimization target, determining an optimal parameter combination; and introducing the optimal parameter combination into a production line for trial operation verification, and determining final target test parameters according to a verification result. The present application solves the technical problems in the prior art, such as test parameter setting depending on experience, lacking systematic verification, not considering the key role of pressure parameters and being unable to balance high detection rate and zero damage rate.

In secondary batteries, this method efficiently performs short-circuit testing at locations with a high probability of short circuits. [Solution] The method includes the steps of: measuring a first surface temperature, which is the temperature of the end face of the electrode stack; connecting charge / discharge probes to the positive and negative terminals of the electrode stack and applying a current; measuring a second surface temperature, which is the temperature of the end face of the electrode stack when the current is applied; and determining whether or not a short circuit has occurred based on the difference between the first surface temperature and the second surface temperature.

The invention provides a short-circuit risk assessment method, system and device for an energy storage system and a medium, and the method comprises the steps: obtaining historical temperature data, fitting a temperature change curve according to the historical temperature data, and dividing the temperature change curve into a plurality of temperature detection curves; acquiring historical load data, and fitting a load change curve according to the historical load data; setting a plurality of detection SOC nodes and a plurality of detection times, and matching the temperature detection curve, the load change curve, the detection SOC nodes and the detection times to generate a plurality of test conditions; and performing short-circuit test on the battery according to the test condition, and performing short-circuit risk assessment on the battery according to the test result. According to the invention, the problem that the state change of the battery in the use process cannot be comprehensively reflected because the short-circuit test of the battery in the prior art is a no-load static working condition and the constraint conditions are few is solved.