115 results about "Cell voltage" patented technology

An apparatus for diagnosing a battery according to an embodiment of the present disclosure includes a voltage measuring unit configured to measure a voltage of a battery during a discharge process of the battery; a pulse output unit configured to generate a discharge pulse at every predetermined cycle and output the generated discharge pulse to the battery; and a control unit configured to calculate a resistance value of the battery based on a voltage deviation of the battery due to the discharge pulse, determine a resistance pattern in a preset initial discharge region based on the calculated resistance value, and diagnose whether there is lithium precipitation in the battery according to the determined resistance pattern.

The invention relates to a method for operating a fuel cell stack. In normal operation the anode is supplied with hydrogen and the cathode is supplied with air. At shutdown of the fuel cell stack the anode is inerted with an inert gas, for example nitrogen. According to the invention, at shutdown the following steps are carried out while monitoring the average cell voltage of all fuel cells of the fuel cell stack: a) the air supply to the cathode is terminated while the anode is initially continued to be supplied with hydrogen b) the hydrogen supply to the anode is terminated and the anode is inerted with the inert gas as soon as the average cell voltage falls below a first threshold value, the anode being supplied with the inert gas instead of hydrogen, wherein the hydrogen on the anode side is displaced c) the air supply to the cathode is resumed while the anode continues to be inerted with the inert gas d) the air supply to the cathode is terminated as soon as the average cell voltage falls below a second threshold value, wherein at the same time the inerting of the anode is terminated. The invention also relates to a control device which is designed to carry out the method according to the invention or individual steps of the method.

The invention discloses an equalization control method applied to a 12V battery pack, and relates to the technical field of equalization control of a vehicle-mounted 12V low-voltage battery pack. The method comprises the following steps that S1, an SOC layering threshold value + an SOH grading threshold value + a monomer temperature serves as a balance starting basis, balance is started only when a low SOC is smaller than 20% and the monomer voltage difference delta V is larger than or equal to 50 mV and the monomer temperature T is larger than or equal to 0 DEG C, active balance or passive balance is switched according to the monomer temperature T when the high SOC is larger than 80%, and a balance mode is determined in combination with the SOH grading threshold value when S is larger than or equal to 20% and smaller than or equal to 80% when S is larger than or equal to 20% and smaller than or equal to 80%; and S2, the passive equalization unit is connected in series with an NTC temperature compensation resistor, the temperature coefficient of the NTC resistor is-2.5% / DEG C to-3% / DEG C, and the equalization current is improved by reducing the equivalent resistance at a low temperature (less than 0 DEG C). Through SOC + SOH + temperature multi-dimensional triggering, low SOC false triggering is avoided, the equalization termination delta V is reduced to 10 mV, and the voltage difference rebound amplitude after standing is smaller than 5 mV.

The invention relates to a method of operating an electrochemical cell, the method comprising determining a cell voltage, comparing the cell voltage with a minimum cell voltage corresponding to an end-of-life state of the cell, wherein the minimum cell voltage is updated over the lifetime of the cell depending on an area specific resistance of the cell. The invention also relates to a control system for controlling operation of an electrochemical cell, to an electrochemical cell system, and to computer- implemented methods of determining an end-of-life state of an electrochemical cell.

The invention relates to a method for detecting a fault condition (F) of at least one first battery cell (16a) of a battery (18) having a plurality of battery cells (16), the cell voltage (Ul) of the first battery cell (16a) being determined repeatedly in an operating state (22, T) of the battery, in which operating state the change in the battery current (I) over time is less than a predefinable limit value, an electrical cell variable of the first battery cell being determined from the cell voltage of the first battery cell. The cell variable is then compared with a reference value (26a, 26b, U2), which is determined from the cell voltage detected at the respective point in time of the measurement of at least one battery cell different from the first battery cell, the fault condition (F) of the first battery cell being detected at least when the deviation (dl, d2) of the electrical cell variable (24a, 24b, Ul) from the first reference value provided at the same point in time of the measurement exceeds a predetermined first threshold value.

The utility model discloses a kind of online high-precision battery internal resistance detection devices based on digital-analog conversion chip, it is related to power electronics field, the device includes battery voltage sampling circuit, digital-analog conversion circuit and battery discharge circuit, battery voltage sampling circuit connects battery to be measured, obtains the discharge voltage of voltage sampling loop and the open-circuit voltage of battery open-circuit voltage loop;Battery discharge circuit connects battery to be measured, and is used to obtain the discharge current of battery to be measured in voltage sampling loop;Battery voltage sampling circuit and battery discharge circuit are connected with digital-analog conversion circuit, and digital-analog conversion circuit obtains open-circuit voltage, discharge voltage and discharge current;By optimizing circuit topology and control strategy, the high-precision battery internal detection is realized, simultaneously meet the special needs of online detection under battery charge-discharge working condition, to solve the precision insufficient, not online detection, high cost and poor reliability and other problems of existing battery internal resistance detection device.

A method for operating a fuel cell stack with an anode and a cathode is proposed. During normal operation, the anode is supplied with hydrogen and the cathode with air. When the fuel cell stack is switched off, the anode is inerted with an inert gas, such as nitrogen.According to the invention, the following steps are performed during shutdown while simultaneously monitoring the mean cell voltage across all fuel cells of the fuel cell stack: a) Termination of the air supply to the cathode, while the anode initially continues to be supplied with hydrogen; b) Termination of the hydrogen supply to the anode when the mean cell voltage falls below a first predefined threshold and inerting of the anode using the inert gas, which is supplied to the anode instead of hydrogen, displacing any hydrogen present on the anode side; c) Resumption of the air supply to the cathode, while the anode initially continues to be inerted with the inert gas; and d) Termination of the air supply to the cathode when the mean cell voltage falls below a second predefined threshold, simultaneously terminating the inerting of the anode.Furthermore, the invention relates to a control unit which is suitable for carrying out the inventive method or individual steps of the method.

The application discloses a lithium battery protection plate cell voltage equalization and protection threshold adjustment method, and relates to the technical field of lithium battery protection plates.The application synchronously completes online estimation of a state of charge SOC and a state of health SOH of a cell and analysis of cell dispersion by collecting electrical parameters and working condition data of each single cell of a battery pack in real time;based on charging, discharging, and standing full working condition division, differential dynamic equalization control is executed, and cell equalization state, SOH dispersion, real-time working condition, and temperature data are linked to adaptively and dynamically adjust overcharge, overdischarge, overcurrent, and other protection thresholds;finally, through a whole-process closed-loop control of collection-estimation-equalization-threshold adjustment-closed-loop verification, the problems that cell equalization and protection threshold control are independent of each other and cannot adapt to cell aging and consistency differences in the prior art are avoided, protection mis-triggering and cell over-stress damage are avoided, and the cycle service life and operation safety of a lithium battery pack are significantly prolonged.

This application relates to the field of vehicle technology, and in particular to a method, device, and vehicle for replenishing a vehicle's low-voltage battery. The method includes: in a vehicle's sleep state, acquiring relevant data about the low-voltage battery using a low-voltage battery management system, wherein the relevant data includes at least one of total voltage, total current, total temperature, and individual cell voltage; estimating the remaining charge of the low-voltage battery based on the relevant data, and determining whether the low-voltage battery meets preset replenishment conditions based on the relevant data and at least one of the remaining charge; if the preset replenishment conditions are met, waking up the vehicle and controlling the vehicle's power battery to replenish the low-voltage battery; if the preset replenishment conditions are not met, controlling the low-voltage battery management system to enter a sleep state, and waking up the low-voltage battery management system again after a preset interval. This solves the problems in related technologies where a low-voltage battery is depleted in a vehicle's sleep state, leading to the vehicle's inability to start normally and a poor user experience.

This invention discloses a method for the synergistic control and removal of organic matter in the hydrometallurgical process of zinc smelting, belonging to the field of hydrometallurgical technology. It includes the following steps: incorporating the TOC content of manganese ore powder and iron removal agent into quality monitoring and limiting content thresholds; controlling the addition amounts of flocculant, bone glue, and organic cobalt removal agent; and simultaneously adjusting the concentrations of zinc ions and soluble silicon in the supernatant to reduce liquid viscosity, thereby reducing the introduction of impurities at the source; adding activated carbon to the purification process to adsorb organic matter; and adding a waste liquid circulation filtration system to the electrolysis process, while selectively adding modified activated carbon to remove suspended solids, organic matter, colloids, and harmful impurity ions from the electrolytic waste liquid. This invention achieves three main benefits: first, it establishes a synergistic removal system for fine suspended solids, colloids, organic matter, and impurity ions; second, it increases the electrolysis current efficiency to over 90% and reduces cell voltage; and third, it improves the utilization efficiency of fresh liquid and reduces overall production costs.

This invention relates to the field of safety monitoring and fault diagnosis technology for power batteries in new energy vehicles, specifically a thermal runaway early warning and diagnostic analysis system for power batteries in new energy vehicles. The system includes: a single-cell voltage drop holding module, a sampling voltage extraction and drop judgment module, a vehicle operating condition and single-cell anomaly differentiation module, an anomaly early warning and continuous tracking module, and an early warning threshold feedback and parameter optimization module. The memory capacitor maintains and extends the transient voltage drop of the single-cell via a first discharge branch and a second charging branch, outputting a sampling voltage. Based on the shortest duration threshold, polling sampling period, discharge time constant, and charging time constant, the system performs parameter checks and adjustments to meet output requirements. This invention retains short-term abnormal voltage drops without increasing the polling sampling frequency of the analog-to-digital converter.

This application relates to a battery level calibration method, apparatus, device, chip, and chip module. The method includes: in response to a terminal device being connected to a charger and the target battery of the terminal device being in a target off-charging state, acquiring the battery voltage of the target battery within different target time windows; for each target time window, determining the target open-circuit voltage of the target battery based on the battery voltage corresponding to the target time window; determining a calibration charge level matching the target open-circuit voltage; and updating the displayed battery level of the terminal device with the calibration charge level. This method improves the accuracy of battery level display.

The present disclosure relates to a battery abnormality detection apparatus and method, and a battery pack, for precisely detecting an abnormal battery cell. A battery abnormality detection apparatus includes a memory (100) configured to store an instruction, and a processor (200) configured to execute the instruction, detect an abnormality of a target battery cell of battery cells based on a cell voltage of the target battery cell, determine (S200) a size of an interquartile range of cell voltages for the battery cells, and analyze a relative behavior of the cell voltage of the target battery cell with respect to the cell voltages for the battery cells based on the size of the interquartile range.

The application provides a high-voltage cross double sampling circuit, an analog-to-digital converter and a battery management system, wherein the high-voltage cross double sampling circuit comprises a switched capacitor module, an enable control module and a capacitor initial setting module; after the switched capacitor module is turned on, the high-voltage signal and the low-voltage signal are cross double sampled through switch switching; the enable control module is connected with the switched capacitor module and is used for turning on the switched capacitor module when an enable signal is valid; and the capacitor initial setting module is connected with the switched capacitor module and is used for setting the initial state of each capacitor in the switched capacitor module when the enable signal is invalid. The application solves the problem of low battery voltage detection speed of the existing high-voltage sampling circuit.

The present application relates to a kind of bipolar electrochemical test cell structure and its method for testing catalytic electrode performance and continuously testing cell voltage, belong to electrochemical performance detection technical field.The test cell structure of the present application includes N test channels, each test channel includes continuously arranged M grooves, the groove wall at the junction of adjacent two grooves is made of insulating material, and a plurality of clamping slots are symmetrically opened on the opposite two side walls in each groove, N≥2, M≥3.The test cell can be used to continuously test the performance of catalytic electrode under several electrolytic cells, and the external voltage growth after continuously stacking several electrolytic cells, and then calculate the cell voltage.The test cell and analysis method can simulate the working mode of bipolar electrolytic cell catalytic electrode wireless connection under real working condition, more truly reflect the catalytic performance of catalytic electrode under wireless connection mode, and can also provide data support and theoretical basis for the design of bipolar electrolytic cell cell number and cell voltage.

A method for abstracting a plurality of software interfaces in a battery management system includes monitoring a rechargeable energy storage system of a vehicle with multiple battery monitoring sensors, receiving data from the battery monitoring sensors in multiple non-standard formats at an agnostic interface layer of an agnostic battery monitoring integrated circuit controller, converting the data received at the agnostic interface layer via an abstraction layer into a unified format, decoupling multiple communication protocols of multiple battery monitoring interface circuits in the agnostic battery monitoring integrated circuit controller to interact with a specific battery monitoring interface controller, where the data includes a multiple cell voltages, multiple battery module temperatures, and multiple battery cell sensing diagnostics in the rechargeable energy storage system, and transmitting one or more messages to a driver of the vehicle based on the cell voltages, the battery module temperatures, and the battery cell sensing diagnostics.

Vehicle (100) comprising: an electric motor (114); and a fuel cell stack (106) electrically coupled to the electric motor (114), the fuel cell stack (106) comprising: a plurality of bipolar plates (202), each bipolar plate (202) of the plurality of bipolar plates (202) comprising one or more cell voltage measuring tongues (206); and a plurality of insulating under-sealing layers (204) alternating with the plurality of bipolar plates (202); wherein an edge of each cell voltage measuring tongue (206) is shaped to define a hemispherical pocket (504) for mounting a spring-loaded contactor (212) of a measuring device;characterized in that the plurality of bipolar plates (202) comprises a first set of bipolar plates (202) with a first positioning of the cell voltage measuring tongues (206) and a second set of bipolar plates (202) with a second positioning of the cell voltage measuring tongues (206) which is offset with respect to the first positioning of the cell voltage measuring tongues (206); wherein the fuel cell stack (106) further comprises an insulator spacer block (302) having one or more through-holes (308) dimensioned to accommodate the spring-loaded contactor (212) of the measuring device; and wherein each insulating under-sealing layer (204) of the plurality of insulating under-sealing layers (204) comprises a corrugated edge (602).

The present application relates to a kind of U-shaped titanium copper clad aluminum base lead dioxide composite anode plate for non-ferrous electro-deposition and preparation method thereof, belong to hydrometallurgy technical field.The composite anode plate of the present application includes titanium copper clad aluminum rod conductive beam, transition titanium copper clad aluminum plate, U-shaped titanium copper clad aluminum rod manganese dioxide composite anode and longitudinal conductive reinforcing rib, titanium copper clad aluminum rod conductive beam and transition titanium copper clad aluminum plate include secondary aluminum layer, copper layer and titanium layer from inside to outside in sequence;U-shaped titanium copper clad aluminum rod manganese dioxide composite anode rod and longitudinal conductive reinforcing rib include titanium copper clad aluminum rod matrix, tin-sb-bi-ce-nickel composite oxide Sn-Sb-Bi-Ce-NiO x bottom layer, manganese-cerium-copper composite oxide Mn-Ce-CuO x Middle layer and cerium-doped-cobalt γ-MnO2 Composite active layer.Compared with traditional lead-silver multi-element alloy, the anode life of the composite anode plate of the present application can be prolonged by 2 times, the cell voltage is reduced by more than 12%, the current efficiency is increased by more than 4%, and the quality of cathode product is high.

The MCU (100) of the Module Interface / F receives a detection signal of the cell voltage from the Cell Monitoring Unit (CMU), and when the cell voltage is equal to or greater than an upper limit threshold, sends a charge reduction signal to the MCU (101) of the Power Converter (PCS) to reduce the charging power of the string. During the period when the MCU (101) receives a control signal from the String Controller (SC) but does not receive the charge reduction signal from the MCU (100), it controls the Power Converter (PCS) to bring the charging power of the string closer to the charging power command value; and during the period when the MCU (101) receives the control signal from the String Controller (SC) and the charge reduction signal from the MCU (100), it controls the Power Converter to bring the charging power of the string closer to the charging power command value.

This invention relates to the field of battery management technology, and provides a method, system, device, and medium for estimating the state of charge (SOC) of a lithium battery without current sampling. The method includes determining the current estimated boundary state range based on the current operating data of the target battery pack, the remaining capacity at the previous time, and a preset open-circuit voltage-remaining capacity mapping relationship; performing SOC analysis based on the cell voltage and the current estimated boundary state range to obtain the current SOC; and performing SOC display correction based on the current battery state obtained from battery state analysis using current remaining capacity and historical cell voltage time-series data, the current SOC, and preset SOC monotonicity constraints to obtain the target battery's SOC. This invention enables SOC estimation that conforms to actual capacity changes and suppresses reverse drift under low-cost battery management conditions without current sampling, effectively meeting the dynamic tracking requirements of accurate, stable, reliable, and user-friendly SOC tracking.

The application discloses a power battery power control method and related device, and relates to the field of new energy vehicles, and comprises the following steps: in the working process of a power battery, battery state data of the power battery is acquired in real time, and then a target large current matched with the battery state data of the power battery and a continuous discharge duration corresponding to the target large current are determined; when the output current of the power battery is not less than the target large current, the actual continuous duration that the current output current is not less than the target large current is counted, when the actual continuous duration is greater than the continuous discharge duration corresponding to the target large current, the allowable power of the power battery is reduced to a first allowable power, and after the allowable power of the power battery is reduced to the first allowable power, the output current or output voltage of the power battery is re-planned by the power system, so that the battery voltage is prevented from rapidly dropping, and then an under-voltage fault caused by the drop of the battery power capacity is avoided.

The application discloses a kind of battery pack under parking mode under-voltage protection method and device, it is related to the field of automobile electronics, the method comprises: obtaining the system power consumption after being set vehicle main circuit breaker is disconnected, and according to the system maintenance time and system power consumption that user pre-set, determine the battery capacity threshold that being set vehicle needs to reserve;According to the cell voltage-capacity curve that is built, battery capacity threshold is converted into cell voltage threshold;Cell voltage-capacity curve is used to characterize the mapping relationship between battery voltage and battery capacity in the process of battery discharge;Determine the real-time cell minimum voltage of battery pack, under the condition that real-time cell minimum voltage is less than cell voltage threshold, trigger parking mode under-voltage protection and disconnect main circuit breaker.The application can return to PM UVP demand itself, ensure that low-voltage battery pack can maintain a period of power supply demand after CB is disconnected, avoid over-discharge of low-voltage battery pack.

The application discloses a method for predicting the maximum cell voltage of a battery and a battery management system. A method for predicting the maximum cell voltage of a battery during use is provided, comprising: obtaining the remaining capacity, temperature, and maximum cell voltage and actual current of the battery at a current sampling time; predicting the pressure rise of the maximum cell voltage caused by cumulative polarization at a future time according to the remaining capacity, temperature, and actual current of the battery at the current sampling time, and the maximum cell voltage at the current sampling time and N sampling times before the current sampling time, wherein two adjacent sampling times are separated by a fixed sampling period; and determining the predicted voltage of the maximum cell voltage at the future time according to the maximum cell voltage at the current sampling time and the pressure rise. The method can predict the maximum cell voltage of the battery during use in real time, simply and efficiently.

The application discloses a phosphide nanometer array catalyst for seawater hydrogen evolution and a preparation method and application thereof. The catalyst takes foamed nickel as a carrier to provide support and conductive effect for the catalyst; the catalyst is composed of a composite material of nickel, molybdenum, phosphorus and cobalt, and a nanorod array structure of the catalyst main body is formed on the base. The cobalt-doped nickel molybdenum phosphide nanorod array catalyst provides high active sites, the phosphide layer is in-situ oxidized into an active phase of Ni(OH)2 to accelerate reaction kinetics, and granular phosphide (P-Metal bond) on the surface of the nanorod blocks Cl ‑ erosion, and a three-dimensional porous structure promotes bubble detachment to resist seawater corrosion; the catalyst can simultaneously serve as a cathode (HER) and an anode (OER) to realize dual-function integration, realizes full-hydrolysis voltage ≤1.60 V (10 mA cm ‑2 ) in 1 M KOH solution, and stably operates for ≥88 h (current density attenuation rate ≤10%) under a cell voltage of 1.90 V.

This application relates to a method, apparatus, electronic device, and storage medium for anomaly identification in an energy storage system. The method includes: acquiring the inter-cell voltage between every two battery cells in the energy storage system, the inter-cell voltage between the battery cell at the positive terminal and the battery electrode, and the inter-cell voltage between the battery cell at the negative terminal and the battery electrode; performing anomaly identification based on the inter-cell voltage and the inter-cell voltage to obtain an identification result; the identification result includes whether an anomaly exists in the energy storage system and the type of anomaly if an anomaly exists. Using this application, anomalies in the energy storage system can be identified, thereby allowing for corresponding measures to be taken based on the anomaly situation, reducing various safety problems caused by anomalies such as insulation failure.

The invention discloses a hydrogen fuel cell system life prediction system which comprises the following steps: a model construction module constructs an electric pile life prediction empirical model based on historical durability data of a hydrogen fuel cell system and stage characteristics of voltage attenuation of an electric pile of a hydrogen fuel cell; the life prediction module obtains a corresponding attenuation correction coefficient through a pile life prediction empirical model by utilizing historical durability data and combining with a parameter adjustment rule, obtains a pile minimum monolithic voltage attenuation curve corresponding to each reference current through the attenuation correction coefficient, and calculates a pile minimum monolithic voltage attenuation curve; and calculating to obtain a life prediction value corresponding to each reference current in the preset scene, and selecting the minimum life prediction value as a final life prediction value. By predicting the service life of the hydrogen fuel cell system, the memory occupation is reduced, and the cost is saved.

A method of setting information about a battery pack includes deriving, by a main control unit (MCU), information about a number of a plurality of battery cells based on a set resistance value connected to an input terminal of the MCU; when the derived number of the plurality of battery cells and a set maximum number N of cells are not the same, changing, by the MCU, a cell parameter indicating the number of battery cells from the maximum number of cells to the derived number of the plurality of battery cells; transmitting, by the MCU, a cell information request signal for requesting a number of cell voltages corresponding to the cell parameter to a battery monitoring integrated circuit (BMIC) connected to the plurality of battery cells; and receiving, by the MCU, a plurality of battery cell voltage signals from the BMIC.

The application discloses a kind of abnormal detection methods of battery cell, comprising the following steps: collecting the operating parameter of battery pack, and filtering cleaning;The operating parameter after filtering cleaning is segmented according to multiple operating intervals of battery pack;Multiple operating intervals include charging interval, discharging interval, standing interval after discharging, standing interval after charging;According to multiple operating intervals, calculate cell voltage consistency coefficient and adaptive voltage difference, and carry out real-time abnormal alarm identification;Extract the voltage characteristics of charging interval and periodic signal statistical feature vector, and carry out periodic abnormal feature identification;According to real-time abnormal alarm and periodic abnormal feature, locate abnormal cell.The detection method of the application, by segmenting the operating state of battery pack, respectively analyzing operating parameter, identifying abnormal alarm and periodic abnormal feature, realizes accurate positioning of abnormal cell.

This invention discloses a monitoring method for a fuel cell system, relating to the field of fuel cell technology. The method includes: simultaneously acquiring the current-voltage polarization curve and electrochemical impedance spectroscopy (EIS) of the fuel cell system at a preset current point; obtaining real-time impedance parameters based on the EIS, and obtaining real-time polarization slope parameters, real-time average single-cell voltage, and real-time minimum single-cell voltage based on the current-voltage polarization curve; determining calibration test parameters based on the EIS, preset EIS, real-time impedance parameters, preset impedance parameters, real-time average single-cell voltage, real-time minimum single-cell voltage, preset average single-cell voltage, and preset minimum single-cell voltage; determining the real-time fuel cell stack lifetime based on the calibration test parameters, the current-voltage polarization curve, and the preset current-voltage polarization curve; and determining fault location information and early warning information based on the real-time fuel cell stack lifetime. This effectively improves the accuracy of fault diagnosis.

A battery controller, a battery pack, an electric vehicle, a battery diagnosis method, a recording medium are provided. A battery diagnosis device according to the present application includes: a voltage detector configured to measure a cell voltage of a battery cell; and a control circuit that applies a moving window of a first time length to a reference voltage curve to determine a plurality of sub voltage curves, the reference voltage curve being a time series indicating voltage values of the cell voltage measured at each sampling time within a predetermined period, and determines, for each sub voltage curve, a long-term average voltage value of the sub voltage curve using a first average filter of the first time length, a short-term average voltage value of the sub voltage curve using a second average filter of a second time length shorter than the first time length; and compares each of a plurality of voltage deviations determined for the plurality of sub voltage curves with a first deviation threshold and / or a second deviation threshold to determine whether the battery cell is abnormal.