411 results about "Test battery" patented technology

The invention discloses a battery capacity prediction and state evaluation method and system based on multi-model collaborative learning, and belongs to the technical field of battery management. The method comprises the following steps: constructing a database containing multiple lithium ion battery long-term cycle data, and classifying according to a capacity attenuation trend; cleaning and preprocessing short-term cycle data of the to-be-tested battery; matching the to-be-tested data with the long-term attenuation trend in the database by using a clustering algorithm, and determining an optimal matching trend; distributing weights for the data in the matching trend by adopting a correlation algorithm, and generating initial capacity attenuation prediction; performing sequence correction on the preliminary prediction in combination with meta-learning and a related model, and generating a smooth future attenuation trend conforming to a physical law; and outputting a capacity prediction and health state evaluation result, and evaluating the prediction precision through a root-mean-square error and an average absolute percentage error. The method significantly improves the precision and generalization ability of long-term capacity prediction, and is suitable for various scenes such as electric vehicles, energy storage systems, consumer electronics and the like.

The invention provides a Bluetooth equipment battery endurance test method, which is characterized in that a Bluetooth signal is sent and / or received through a Bluetooth adapter, a voltage value of a battery is acquired through a power supply monitoring module, and the method comprises the following steps: when a user tests Bluetooth equipment, the Bluetooth signal and the voltage value of the Bluetooth equipment are acquired; determining the device type of the Bluetooth device according to the Bluetooth signal, and determining an operation instruction through the Bluetooth device type; performing power consumption operation on the Bluetooth equipment according to the operation instruction; and determining the endurance of the battery of the Bluetooth equipment according to the Bluetooth signal and the change of the voltage value. The Bluetooth signal and the voltage value are acquired at the same time, so that the cruising ability of the Bluetooth equipment is measured, a real use scene is simulated, the Bluetooth equipment is fully automatically tested, manual operation is not needed in the process, and the test is efficient and accurate.

The invention discloses a battery SOC estimation method, device and equipment, a storage medium and a product. Acquiring real-time operation parameters of the to-be-tested battery; on the basis of the real-time operation parameters, corresponding initial SOC values are obtained through calculation by using at least two different battery state of charge SOC estimation algorithms; determining the adaptive weight of each SOC estimation algorithm based on the current working condition of the to-be-tested battery and the real-time estimation error of each SOC estimation algorithm; and determining a target SOC value based on the initial SOC values and the adaptive weights of the SOC estimation algorithms corresponding to the initial SOC values. The initial SOC value is calculated by combining at least two different SOC estimation algorithms, then the adaptive weight is determined according to the current working condition of the battery and the real-time estimation error of each algorithm, and finally the weighted initial SOC values are fused to obtain the target SOC value. And through a self-adaptive fusion mechanism, the SOC estimation precision is effectively improved, and the adaptability to different working conditions and the anti-interference capability are enhanced.

The invention discloses a method for researching an external short-circuit current impact damage mechanism of a lithium ion battery, and the method comprises the steps: testing the limit short-circuit current of the battery through a fitting mode, and determining the time upper limit of short-circuit current impact through an uncontrolled time short-circuit experiment; millisecond-level short-circuit current impact tests of different time scales are carried out on the battery, and performance tests are carried out on the battery every N times of impact so as to monitor recession characteristics of parameters such as capacity and internal resistance of the battery; performing prediction and quantitative calculation on damage mechanisms such as positive and negative electrode active material loss and lithium ion loss by combining a capacity increment curve and an open-circuit voltage curve; and disassembling the battery in an inert gas atmosphere, carrying out microstructure, morphology and element distribution characterization on the electrode and the diaphragm, and verifying a damage mechanism. According to the method, electrochemical testing and material characterization are combined, the corresponding relation and evolution law of battery performance degradation and internal material damage under external short-circuit current impact are disclosed, and a basis is provided for safety design and reliability evaluation of a battery system.

The embodiment of the invention provides a battery open-circuit voltage correction method and device, a vehicle, a medium and a product. The method comprises the following steps: when the standing time of a to-be-tested battery represents that the to-be-tested battery does not enter a steady-state response, determining the polarization voltage of the to-be-tested battery in the standing time according to the polarization attenuation degree of the to-be-tested battery; the polarization attenuation degree of the to-be-detected battery is determined according to the standing time and the polarization time constant of the to-be-detected battery; and according to the polarization voltage of the to-be-measured battery in the standing time, correcting the open-circuit voltage of the to-be-measured battery obtained in the standing time to obtain the corrected open-circuit voltage of the to-be-measured battery. The method is used for achieving the effect of improving the measurement accuracy of the OCV.

Provided are a method for battery derating protection, an electronic device, and a storage medium. In the method, application stages of a to-be-tested battery are correspondingly adjusted based on decline of a state of health of the to-be-tested battery; when the to-be-tested battery is in a beginning of life stage or a middle of life stage, a state-of-charge usage interval of the to-be-tested battery is set to an initial usage interval; when the to-be-tested battery transitions from the middle of life stage to an end of life stage, the state-of-charge usage interval is narrowed to a limited usage interval; when the to-be-tested battery transitions from the safety of life stage to the hazard of life stage, the to-be-tested battery is forcibly discharged to the lower limit of the limited usage interval; after completing forced discharge, the state-of-charge usage interval of the to-be-tested battery is set to a single value.

The invention discloses a lithium ion battery capacitance detection method, which comprises the following steps: constructing a first training model containing association of charging and discharging data and ultrasonic characteristics based on a calibrated battery, and accurately utilizing ultrasonic feedback information to analyze internal characteristics of the battery; when a tested battery is analyzed, a spatial distribution and energy propagation characteristic correlation model is obtained by means of the model, and the change conditions of an internal structure and a propagation path can be rapidly judged, such as abnormities of electrode material falling, diaphragm damage and the like; and meanwhile, the internal first capacity is flexibly determined by integrating the ultrasonic characteristic contribution and the second capacitance data, so that the actual charge-discharge performance of the battery is considered, the potential of the ultrasonic characteristics for capacity evaluation is deeply excavated, and the accuracy and reliability of the internal state evaluation of the battery are effectively improved.

A positive electrode active material that enables an increased discharge capacity retention rate of cycling performance is provided. A secondary battery includes a positive electrode pressed under a linear pressure higher than or equal to 100 kN / m and lower than or equal to 3000 kN / m and a negative electrode. When a test battery that includes the positive electrode and a negative electrode containing lithium undergoes, in an environment at higher than or equal to 25° C. and lower than or equal to 45° C., a cycling test of 50 repetitions of a cycle of charging and discharging in which, after constant current charging is performed at a charge rate of 0.5 C (1 C=200 mA / g) until a voltage of 4.7 V is reached, constant voltage charging is performed until the charge rate reaches 0.05 C at a voltage of 4.7 V, and then constant current discharging is performed at a discharge rate of 0.5 C until a voltage of 2.5 V is reached, and the discharge capacity of the battery is measured in each cycle, a discharge capacity value measured in the 50th cycle is greater than or equal to 35% and less than 100% of the maximum discharge capacity value in all the 50 cycles.

The invention relates to the technical field of battery replacement compatibility testing, in particular to a battery replacement compatibility testing method and system oriented to a battery replacement battery system. The method comprises the following steps: carrying out multiple staggered releasing / locking cycles on a to-be-tested battery replacement battery system on a simulated vehicle; if the structure and the function of the battery replacement battery system are normal, the battery replacement battery system is installed on a real vehicle, and the real vehicle runs on a test site; and according to whether the communication between the battery replacement battery system and the real vehicle is normal, whether the battery replacement cooling interface leaks the cooling liquid, whether the battery replacement battery system is in an effective locking state, whether the battery replacement electrical interface is normal, and whether the battery frame is normal, performing a vehicle end cooperative function test on the battery replacement battery system. Through a simulation vehicle, a real vehicle, a battery swap station simulation system and a vehicle end simulation system, the compatibility of the battery swap battery system with the vehicle end and the battery swap station is tested from the aspects of size, structure, function, passing and the like.

The invention discloses an energy storage battery aging evaluation method and device under an immersed liquid cooling condition, terminal equipment and a storage medium, and belongs to the field of battery testing. The method comprises the steps of obtaining a first active lithium ion loss change rate and a first active substance loss change rate according to a battery voltage and a first battery capacity identification characteristic peak in a to-be-tested battery test, and calculating a battery capacity loss change rate according to a first battery capacity and a second battery capacity before the test; determining a second active lithium ion loss change rate, a second active material loss change rate and a battery impedance change rate based on the electrochemical impedance spectrogram and the pre-test impedance, and determining the battery capacity loss change rate and the battery impedance change rate according to the determined active lithium ion loss, the active material loss, the battery capacity loss change rate and the battery impedance change rate. The resistance, the moisture content and the dielectric loss change rate of the cooling liquid to be measured construct an analytic hierarchy model, the battery aging condition is determined according to the calculated aging evaluation value, and the problem that deviation exists in single evaluation in the prior art is solved.

The embodiment of the invention relates to a battery detection method and device based on ultrasonic waves, electronic equipment and a storage medium. The method comprises the steps that an ultrasonic generator is controlled to apply an ultrasonic excitation signal to a first position of a detected battery; receiving an ultrasonic sensing signal collected by an ultrasonic sensor from a second position of the tested battery; performing characteristic measurement on the ultrasonic sensing signal to obtain ultrasonic transmission characteristic data; performing discharge state detection on the detected battery to obtain discharge state data of the detected battery; and determining battery state information corresponding to the ultrasonic transmission characteristic data and the discharge state data based on a preset battery state detection model. According to the embodiment of the invention, real-time nondestructive detection is carried out on the state of the battery by using ultrasonic waves, and the battery state model can accurately reflect the association between the ultrasonic transmission characteristics and the discharge state of the battery, so that the state of the battery can be more accurately deduced. And the ultrasonic sensor can be conveniently integrated in a battery system.

The utility model relates to the technical field of batteries, in particular to a battery thermal runaway testing system which comprises a shell, a thermal runaway triggering mechanism and a pressure measuring mechanism, the shell is provided with a containing cavity, and the containing cavity is used for containing a to-be-tested battery; the thermal runaway triggering mechanism is arranged in the accommodating cavity and is used for enabling the to-be-tested battery to generate thermal runaway; the pressure measuring mechanism is arranged in the accommodating cavity and is in contact with at least one side of the battery to be measured, the pressure measuring mechanism is provided with a plurality of pressure measuring point positions, and each pressure measuring point position is in contact with the corresponding part of the battery to be measured so as to measure the pressure borne by different parts in the thermal runaway process of the battery to be measured. According to the invention, the pressure borne by different parts of the to-be-measured battery in the thermal runaway process can be measured, and the distribution characteristics of the air pressure in the shell in the thermal runaway process of the battery can be reflected more truly and accurately.

Disclosed are a battery cell holding device and a battery cell performance test system including the same. The battery cell holding device is configured to receive a tray loaded with battery cells, unload the battery cells from the tray and hold the battery cells, load tested battery cells into the tray, and transfer out the tested battery cells. The battery cell holding device includes a tray seating unit configured to receive a tray, a loading conveyor configured to load a predefined number of battery cells transferred thereto, a shuttle unit configured to transfer the battery cells introduced thereinto from one position to another position, a first transfer module configured to transfer the battery cells in the tray seated in the tray seating unit to the shuttle unit, and a second transfer module configured to transfer, to the loading conveyor, the battery cells transferred by the shuttle unit.

An apparatus for testing a bottom protective board of a battery pack includes a base and a testing mechanism.SOLUTION: The base 100 is configured to support the bottom protective plate 300, the base 100 is provided with a measurement groove, a pressure sensor and a plastic deformation member are provided in the measurement groove, the base 100 is provided with a spacer block, and the bottom protective plate 300 and the base 100 are spaced apart by the spacer block to form an impact chamber; The test groove is located in the impact chamber, the test mechanism 200 includes a test stand 210 and an impact component 220, the test stand 210 and the impact component 220 are disposed on one side of the base 100, and the impact component 220 is suspended on the test stand 210 and located right above the base 100.SELECTED DRAWING: Figure 1

A testing apparatus and method for testing a battery, a device, and a medium are disclosed. The testing apparatus includes a first ray source, a first detector, a second ray source, a second detector, a bearing platform, and a testing unit. The bearing platform is configured to place a battery to be tested, and the bearing platform is movable. A movement trajectory of the bearing platform passes between the first ray source and the first detector, and the movement trajectory of the bearing platform passes between the second ray source and the second detector. The testing unit is respectively connected to the first detector and the second detector. The testing unit is configured to perform defect testing on the battery to be tested based on a ray received by the first detector and a ray received by the second detector.

Surface temperatures for battery cells in a battery pack can be inferred or estimated using internal or core temperatures of the battery cell and a thermal model. The internal temperature may be generated using electrochemical impedance spectrometry (EIS). Delta values from the EIS estimations to the cell surface temperature may be generated based on a thermal model of the battery. The thermal model of the battery may be created using probe points on the surface of a test battery, such as thermocouples.

The invention relates to the technical field of battery testing, in particular to a battery testing system and a battery testing method. The battery testing system comprises a water tank, the top of the water tank is provided with an opening, and fire extinguishing water is stored in the water tank; the tray is detachably mounted at the opening of the water tank, and the tray is used for bearing a battery to be tested; the battery state monitoring assembly is used for monitoring the working state of the to-be-tested battery and driving the battery testing system to be switched between a normal testing state and a high-risk state according to the working state of the to-be-tested battery; and when the battery testing system is in a high-risk state, the tray is separated from the opening of the water tank and falls into the water tank together with the battery to be tested. The battery thermal runaway risk is recognized in real time through the battery state monitoring assembly, the tray and the to-be-detected battery are automatically immersed in the fire extinguishing water in the high-risk stage, early-stage accurate early warning and automatic fire extinguishing of a fire are achieved, and extinguishing delay and secondary accident risks of a traditional post-event processing mode are effectively avoided.

The invention provides double-layer soft package battery normal temperature capacity grading power supply built-in all-in-one machine equipment, which comprises a rack assembly, a battery tray probe assembly and a power supply unit layer, and is characterized in that the battery tray probe assembly comprises a bottom plate, a fire-fighting spraying part, a fan heat dissipation part, a battery tray, a tray clamping and positioning toggle clamp and a probe clamp part; the device has the beneficial effects that the test fixture and the charge and discharge test power supply are integrated, the device integration degree is high, the occupied space is small, the device is divided into two layers to independently control the flexible test battery, the degree is high, the efficiency is high, the device appearance is attractive, operation and maintenance are simple, and particularly, exposed maintenance of a large number of channel lines is avoided; and the device can be widely applied to various large battery plant laboratories and scientific research institutions, and is suitable for being maturely popularized to the market in a large scale.

The invention provides a battery SOC-OCV curve obtaining method and system and electronic equipment, and relates to the technical field of batteries. The method comprises the following steps: acquiring direct-current impedance of a to-be-detected battery; the method comprises the following steps of: performing constant-current discharge on a to-be-detected battery in a full charge state at a plurality of sections of discharge rates which are sequentially reduced, acquiring the working voltage and the RSOC of the to-be-detected battery in each section of discharge process, and fitting to obtain an RSOC-working voltage curve, the constant current used in the first section of discharge process being the standard discharge current of the to-be-detected battery, and the constant current used in the second section of discharge process being the standard discharge current of the to-be-detected battery; the starting voltage point of each subsequent discharge process is triggered to be switched when the working voltage of the battery to be tested in the previous discharge process reaches a corresponding preset threshold value; and performing IR compensation on the RSOC-working voltage curve according to the DC impedance to obtain an SOC-OCV curve of the battery to be detected. According to the technical scheme, the acquisition time of the SOC-OCV curve can be greatly shortened on the premise of ensuring the curve precision.

The invention relates to the technical field of battery testing, and discloses a battery safety testing system which comprises a dynamic loading system used for performing safety testing on a to-be-tested battery according to a target testing instruction; the central control system is connected with the dynamic loading system and is used for searching corresponding target test data from a pre-established standard file according to the battery type of the battery to be tested and the current test type, generating a corresponding target test instruction from the target test data and sending the target test instruction to the dynamic loading system; the standard file comprises test data in one-to-one correspondence with different battery types under different test types, and the test data comprises test parameters and test tool parameters. Therefore, the consistency of each test can be effectively kept, and the comparability of test results is improved. Meanwhile, the automation level and the intelligence level of testing can be improved, the testing efficiency and accuracy are improved, and errors caused by manual operation are reduced.

A device for vacuum pressure testing at multiple angles, comprising: a winding and unwinding device; a device for hot pressing testing at an angle of inclination; a conveyor belt designed to transport at least one battery cell to be tested for hot pressing tests at various angles of inclination from the winding and unwinding device to the device for hot pressing testing at an angle of inclination, and to transport a tested battery cell to be tested back to the winding and unwinding device for collection; a drive device by which the conveyor belt is driven in such a way that it carries out transport at an angle between the winding and unwinding device and the hot press testing device; and a first vacuum chamber, which serves to accommodate the device for hot press testing at an angle of inclination.

The utility model discloses a battery piece testing device and a battery piece manufacturing system, and the device comprises a testing box which is used for placing a to-be-tested battery piece and a standard battery piece, and is provided with a testing lamp which is used for irradiating the to-be-tested battery piece and the standard battery piece; the dustproof cover is located in the test box and used for covering the standard battery piece, a light-transmitting inclined plane is formed on the dustproof cover, an included angle is formed between the light-transmitting inclined plane and the horizontal plane, and the test lamp is suitable for irradiating the standard battery piece from the light-transmitting inclined plane; and the blowing device is provided with an air outlet, and the air outlet directly faces the light-transmitting inclined plane and is used for blowing air to the light-transmitting inclined plane. According to the battery piece testing device provided by the embodiment of the utility model, the cleanliness above the standard battery piece can be ensured, so that the accuracy of short-circuit current detected by the battery piece to be tested is ensured, the testing effect is improved, meanwhile, the automation can be improved, the human interference is reduced, the testing efficiency is improved, the production cost is reduced, the use effect is better, and the application range is wider.

The invention discloses a synchronous test method for SOC-OCV and pulse power of a lithium battery, and the method comprises the steps: S1, carrying out the standard charging and standard discharging of a to-be-tested battery for 5 circles at room temperature, taking the average value of the discharge capacities of the last three times as Cs, and ending the battery when the battery is fully charged; s2, enabling the battery to reach heat balance at the test temperature, standing, and recording the battery heat balance standing tail end voltage Vs; s3, respectively carrying out discharging and charging tests on the battery in a C / 3 or C / 6 constant-current-to-constant-voltage mode to obtain data of a standing tail end voltage I V0, a discharging tail end voltage V1, a standing tail end voltage II V2, a charging tail end voltage V3 and a standing tail end voltage III V4 of the battery under different SOC values; and S4, obtaining a data matrix table according to the voltage data obtained in the step S3, and drawing an SOC-OCV curve and a pulse power value. According to the method, the SOCOCV and the pulse power can be tested at the same time, the accuracy of the test result is high, the test efficiency is greatly improved, and the test period and test resources are saved.

The invention provides 4680 cylindrical battery normal temperature formation and capacity grading test power supply built-in all-in-one machine equipment, which comprises a rack assembly, a test clamp assembly and a power supply unit layer, and is characterized in that the rack assembly comprises a rack, a clamp mounting plate, an operation panel part, a wire slot cover plate and a wire slot; the equipment has the beneficial effects that the equipment is manufactured according to the hot 4680 cylindrical battery formation and capacity grading charge and discharge requirements in the new energy power battery industry, the test fixture and the charge and discharge test power supply are integrated, the equipment is high in integration level and small in occupied space, the equipment is divided into two layers, four independent control fixtures are arranged, the flexible battery test degree is high, the efficiency is high, and the cost is low. The device is beautiful in appearance and simple to operate and maintain, especially avoids the bare maintenance of a large number of channel lines, reduces the maintenance cost of manual training, is widely applied to various large battery plant laboratories and scientific research institutions, and is suitable for large-scale mature popularization in the market.

The invention belongs to the technical field of battery foil rolling detection, and particularly relates to a method for testing a battery foil by using double thickness gauges of an aluminum foil rolling mill, which comprises the following steps of: mounting a sensor assembly on the aluminum foil rolling mill, and acquiring roller rotating speed, rolling force and roller vibration frequency of the aluminum foil rolling mill in real time; and the calculation equipment carries out filtering processing on the original thickness data of the battery foil collected by the thickness gauge based on the roller rotating speed, the rolling pressure and the roller vibration frequency of the aluminum foil rolling mill, instantaneous fluctuation data are filtered, and infrared detectors are arranged on the two sides of a discharging port of the aluminum foil rolling mill. Filtering processing is carried out on thickness data of the battery foil by combining operation parameters of a rolling mill, interference data of vibration of the battery foil on thickness detection in the roller operation process is recognized and removed, and meanwhile detection and cleaning correction are carried out on surface impurities, so that the thickness of a battery foil body and the thickness of the impurities are accurately distinguished; the effect of eliminating false fluctuation and impurity interference is achieved, and the authenticity of thickness detection data is improved.

The embodiment of the invention discloses a battery cell operation condition simulation method and device and a temperature simulation model construction method.The battery cell operation condition simulation method comprises the steps that operation parameters of a to-be-processed battery cell under the real working condition are obtained; the operation parameters comprise an initial temperature and an operation current; determining a target temperature simulation model matched with the to-be-processed battery cell from a plurality of preset temperature simulation models based on the operation parameters and the attribute information of the to-be-processed battery cell; performing simulation processing on the initial temperature and the running current by adopting the target temperature simulation model, and outputting a temperature simulation signal to the battery management unit to test whether the battery management unit fails or not; wherein the temperature simulation signal represents the temperature change of the to-be-processed battery cell under the real working condition. Therefore, the temperature simulation signal representing the temperature change of the battery cell under the real working condition can be output only by inputting the operating parameters of the battery cell, other equipment is not needed in the whole process, the operation is simple and convenient, and the simulation test efficiency is high.

A detection apparatus and a battery production device are described. The detection apparatus includes a scanning frame, a radiation source, a detector, and a carrying platform. The radiation source and the detector are both connected to the scanning frame, and the detector is opposite an emission port of the radiation source. The carrying platform is located between the radiation source and the detector, where the radiation source and the detector can rotate around a same rotation axis, and a rotation direction of the radiation source is the same as a rotation direction of the detector, such that during rotation, the detector remains opposite the emission port of the radiation source, and the carrying platform is located between the radiation source and the detector. The carrying platform is configured to hold a to-be-tested battery. The detection apparatus can achieve detection of deformation of the to-be-tested battery.

The invention relates to the technical field of batteries, and discloses a positive plate coating pit judgment method which comprises the following steps: judging the defect type of a coating pit on the basis of characteristic parameters of the coating pit on a positive plate; preparing a positive plate sample; assembling each positive plate sample, the corresponding diaphragm and the corresponding negative plate to form a pole group, assembling the pole group to form a battery cell, and performing charge and discharge test on the battery cell; disassembling the tested battery cell, detecting whether a dotted lithium precipitation defect appears on a negative plate interface corresponding to the position of the coating pit, and establishing a corresponding relation between the size of each coating pit and the dotted lithium precipitation defect; according to the corresponding relation between the sizes of the various coating pits and the dot-shaped lithium precipitation defects, determining the qualification standards of the various coating pits; and judging whether the positive plate is qualified based on the qualification standard. According to the method for judging the coating pits of the positive plate, the coating pits on the positive plate are classified, the qualified standard is relaxed, and the waste of the positive plate is reduced, so that the use cost is reduced.

A method for testing a battery rack including at least one battery pack by estimating state of health may include implementing a degraded battery simulation state using a relationship among internal resistance of the battery, current flowing through the battery, and amount of heat generated and performing a degradation prediction test in the degraded battery simulation state.

The invention provides a battery pack test method and device, electronic equipment and a computer readable storage medium. The method comprises the following steps: determining an electrical test type of a to-be-tested battery pack; determining test parameters of the electrical test equipment and a connection mode of the electrical test equipment and the to-be-tested battery pack according to the electrical test type; controlling the grounding function of the electrical test equipment to be in a failure state; and after detecting that the electrical test equipment is connected with the to-be-tested battery pack according to the connection mode, controlling the electrical test equipment to load voltage to the to-be-tested battery pack according to the test parameters so as to perform an electrical test corresponding to the electrical test type on the to-be-tested battery pack. The accuracy of the electrical test of the battery pack can be improved.