41 results about "Standard Charge" patented technology

The invention relates to the technical field of electric vehicle charging control, and discloses a charging pile power regulation and control method and device, electronic equipment and a storage medium. The method comprises the following steps of: monitoring multi-dimensional time sequence data such as charging voltage, current and battery temperature in real time, performing state segmentation, and calculating the similarity between a data sequence of each stage and a standard charging template so as to accurately screen out a stable charging state stage. And extracting a power adjustment amount based on the time sequence characteristic and the fluctuation mode of the stage, fusing the adjustment amount of the environment temperature, the equipment load parameter and the charging power, and dynamically generating a power switching rule by using a fuzzy logic controller. And finally, smooth switching and cyclic adjustment of the power levels of the charging piles are realized according to the rule. According to the method, the accuracy and the anti-interference capability of charging state identification are improved, and the adaptability and the collaborative optimization capability of power regulation to a complex environment and a power grid condition are enhanced, so that the charging efficiency and the power grid stability are both considered on the premise of ensuring the safety of the battery.

The invention discloses a battery bumping damage early warning method and system, and relates to the technical field of battery damage early warning, and the method comprises the steps: carrying out a standard charging preprocessing cycle on a single battery, carrying out the complete charging after a preset number of times is reached, and obtaining the initial quality data; performing quasi-static extrusion damage to obtain final-state quality data, and calculating a quality change rate; collecting quality change rates, detection data, simulation data and structure states of multiple groups of batteries to construct a training data set, and training to obtain a deep learning model; battery mechanical collision state monitoring data are obtained in real time, matched feature parameters are obtained through preprocessing and feature extraction and input into the model, and a structural integrity evaluation result is generated; according to the battery bumping damage early warning method and device, early warning is conducted on potential damage in advance through the deep learning model, and potential safety hazards caused by internal damage of the battery are avoided.

The invention relates to the technical field of lithium ion batteries, in particular to a detection capacity grading screening method for energy storage lithium iron phosphate batteries. According to the method, standard charging and discharging circulation is carried out on the battery to obtain nominal capacity, then two-stage constant-current discharging is carried out with decreasing small current in sequence, the discharging capacity is monitored in real time, and if the discharging capacity exceeds a preset capacity interception threshold value, the battery is marked as an abnormal product preliminarily; and starting an abnormal product rechecking process for all marked abnormal products, performing direct-current internal resistance rechecking and / or small-current discharge curve fragment rechecking, and comparing a test result with a pre-established good product data range so as to make final qualification or abnormity judgment. According to the method, batteries with overlarge resistance values can be intercepted through low-current discharge, tab fault batteries are effectively screened, the battery screening cost is greatly reduced, the error-tolerant rate is lower, energy consumption is reduced, the yield can be improved, and a better effect is achieved on detection of capacity grading and pairing consistency.

This application provides a battery impedance analysis method, apparatus, storage medium, and computer equipment. When analyzing battery impedance, an EIS test is performed on the target battery to capture various electrochemical behaviors of the battery during the test process through the dynamic characteristics in the test data. Therefore, the DRT spectrum generated by DRT analysis of the test data can intuitively display the impedance response time corresponding to different electrochemical processes in the time dimension. After determining the response range of each electrochemical process, standard charge-discharge cycles can be performed on the target battery. During the cycle, DCR tests are performed on the target battery for multiple selected cycles, and impedance decomposition is performed on the obtained DCR data based on each response range to achieve real-time subdivision of the overall impedance information. Finally, the impedance decomposition data obtained after subdivision for each selected cycle number are compared and analyzed to generate high-quality impedance analysis results.

The invention discloses a lithium iron phosphate battery capacity grading capacity statistical correction method, and belongs to the field of lithium battery capacity correction. The method comprises the following steps: S1, charging a lithium iron phosphate battery to be subjected to capacity grading to a full charge state according to a standard charging process; s2, discharging to a first cut-off voltage V1 at a constant current I1 in an environment of 25 + / -2 DEG C, and recording a capacity C1; s3, the standing time is T; s4, continuously discharging at a constant current I2 to a second cut-off voltage V2, and recording a capacity C2; s5, calculating the initial combined capacity C < initial > = C1 + C2; s6, extracting N battery samples with the same model and the same batch, and performing standard cycle test to calculate a batch correction normal number K = (sigma Ki) / N; s7, correcting the subsequent battery capacity to obtain C true = C1 + C2-K; and S8, correcting once every half a year when the battery cell formula is not changed, and correcting again when the formula is changed. The method has the beneficial effects that the accuracy and batch consistency of capacity grading capacity statistics are remarkably improved.

A charging station with a replaceable charging gun includes a detachably connected station body and a charging gun body. The lower end of the station body is connected to a power cord and a charging gun connection cable, with a male connector at the end of the charging gun connection cable. One end of the charging gun body has a charging gun head, and the other end has a female connector. This invention's replaceable charging gun charging station features a buckle on the outer wall of the male connector, a locking cavity on the inner side of the outer wall, a locking groove on the wall of the locking cavity of the female connector, and a sliding sleeve on the outermost side of the female connector. The lower end of the sliding sleeve has a protruding wall opposite the locking groove. When the female connector and male connector mate, the protruding wall pushes the ball bearing of the buckle into the locking groove to achieve locking. To unlock, the sliding sleeve is slid backward, the protruding wall no longer pushes the ball bearing, and external force pulls the ball bearing out of the locking groove. The connection method is simple, and the charging gun head can be a European standard, American standard, or Chinese standard charging gun head, allowing one charging station to connect to multiple standard charging gun heads.

The application discloses a method for characterizing lithium precipitation window by using battery polarization potential, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: obtaining a standard charge-discharge potential curve through a discharged battery; setting different rates, and performing charge-discharge tests on a three-electrode battery at different rates to obtain positive and negative charge-discharge potential curves of the three-electrode battery at each rate; comparing the positive and negative charge-discharge potential curves of the three-electrode battery at each rate with the standard charge-discharge potential curve, and calculating the polarization potential of the three-electrode battery at each rate through the potential difference at the maximum deviation of the two curves; and disassembling the three-electrode battery to obtain the polarization potential and the charge-discharge rate when lithium precipitation starts. The main use of the application is to further reduce the risk of lithium precipitation of lithium ion batteries, utilize the correlation between battery lithium precipitation and polarization, utilize the polarization potential to characterize the lithium precipitation window, and predict the internal condition of the battery in advance, so that a more optimal charging strategy can be formulated, and the battery performance can be improved.

A power converter, a charging and discharging device, and a vehicle. The vehicle comprises the charging and discharging device, and the charging and discharging device comprises the power converter. The power converter comprises: a first terminal assembly adapted to connect to a US standard charging pile plug or a European standard charging pile plug; and a second terminal assembly adapted to connect to a European standard vehicle charging socket or a US standard vehicle charging socket, where the first terminal assembly is electrically connected to the second terminal assembly.

The application relates to the technical field of new energy vehicles, and discloses a charging control circuit and method compatible with the national standard and the European and American standard. The circuit comprises a European and American standard charging interface, a national standard charging interface, a first area controller, a second area controller, a central controller, a connection detection circuit and a guide circuit; the European and American standard charging interface is electrically connected with the first area controller; the national standard charging interface is electrically connected with the second area controller; the first area controller is electrically connected with the central controller; the second area controller is electrically connected with the central controller; the European and American standard charging interface comprises a connection signal output end and a guide signal output end; the connection detection circuit is electrically connected with the connection signal output end of the European and American standard charging interface; and the guide circuit is electrically connected with the guide signal output end of the European and American standard charging interface. The application can be compatible with the national standard charging and the European and American standard charging, simplifies the charging logic conversion process, and improves the charging reliability.

This application discloses a request current query method, device, and storage medium based on a battery management system, relating to the field of battery management technology. The method includes: acquiring current state parameters and performing preset anti-jitter processing on the current state parameters to obtain current lookup table parameters; determining whether the current lookup table parameters exceed a preset anti-hysteresis range; if so, querying a standard charge / discharge two-dimensional table based on the current lookup table parameters to obtain the single-machine request current, wherein the standard charge / discharge two-dimensional table is obtained by pre-standardizing the original charge / discharge two-dimensional table, including coordinate filling; and performing parallel processing on the single-machine request current according to a preset aggregation strategy to obtain the target request current. Because this application can perform anti-jitter and anti-hysteresis processing on the lookup table parameters and query based on a pre-standardized charge / discharge two-dimensional table, it effectively suppresses frequent jumps in the current request value caused by parameter fluctuations, significantly improving the stability and reliability of the request current.

The semi-automatic charging cleaning robot comprises a semi-automatic charging assembly, the semi-automatic charging assembly comprises a fixing frame, a charging female head, a movable plate, an ejector pin and an electric push rod, the fixing frame is fixed to a robot body, and the charging female head is matched with a standard charging head of a new energy automobile and installed on the fixing frame; the movable plate is located on the side, away from the charging female head, of the fixing frame, one end of the ejector pin is fixed to the movable plate, the other end of the ejector pin slidably penetrates through the fixing frame, and the two ends of the electric push rod are arranged on the fixing frame and the movable plate respectively. When the electric push rod retracts, the ejector pin penetrates through the charging female head and then pushes out the new energy automobile standard charging head, so that the new energy automobile standard charging head is automatically pushed out after full charging, the charging head does not need to be pulled out manually, the automation degree of charging is improved, the semi-automatic charging assembly is matched with the new energy automobile standard charging head, and the charging efficiency is improved. And charging at the new energy automobile charging pile is supported, so that charging is more convenient.

The application provides a battery power determination method and device, a storage medium and an electronic device, and belongs to the technical field of batteries. The battery power determination method comprises the following steps: acquiring the current charge-discharge capacity, the accumulated total charge capacity, the design capacity and the attenuation rate of a battery; determining the current actual total capacity of the battery based on the accumulated total charge capacity, the design capacity and the attenuation rate of the battery; and obtaining the power based on the current charge-discharge capacity of the battery and the current actual total capacity of the battery. The method can realize real-time calibration of the total capacity without relying on complete standard charge-discharge cycles, effectively avoids the accumulation of integral error caused by long-term shallow charging and shallow discharging, and significantly improves the accuracy of power display.

The invention discloses a universal charging adapter for a direct-current quick charging pile and a control method of the universal charging adapter, and belongs to the technical field of electric vehicle charging. The adapter comprises an input interface unit which is used for physically connecting and communicating with an external direct current quick charging pile; the power distribution matrix is used for dynamically distributing power; the plurality of output terminals comprise an alternating current output terminal and a direct current output terminal; the core controller operates a protocol conversion engine and a power scheduling algorithm; and the protocol conversion engine is used for carrying out bidirectional protocol conversion between the external direct current pile and the charged equipment. Through a three-stage distributed architecture and a protocol conversion engine, the adapter presents an electric vehicle role for an external direct current pile and presents a standard charging pile role for internal charged equipment, plug and play with a mainstream direct current quick charging pile in the market is realized, and direct current quick charging, alternating current slow charging and common electric appliance power supply are supported at the same time. The system has the advantages of being high in compatibility, flexible in power distribution, high in reliability, extensible and the like, and the utilization rate and compatibility of existing charging facilities can be greatly improved.

This invention provides a charging control system, a charging control device, and a storage medium capable of preventing power shortages in the event of atmospheric particulate matter falling in a smart city. The charging control system includes: a charging device configured to store power supplied to a pre-defined area and having a first processor; a device group disposed within the area and configured to receive power from the charging device, the device group having a second processor; and a charging control device having a third processor configured to: predict the amount of atmospheric particulate matter suspended within the area; calculate, based on the predicted amount of atmospheric particulate matter, a removal charge for removing atmospheric particulate matter intruding into the device group; calculate a total charge by adding the removal charge to the standard charge supplied to the area; and perform charging control to store power exceeding the total charge in the charging device.

The application provides a lithium battery failure prediction method, device and system, and belongs to the technical field of lithium battery failure. In the lithium battery charging and discharging process, the difference value of the residual charging capacity of two adjacent effective full charges is calculated based on the same battery cell, and the abnormal difference value is determined in the difference value of each battery cell. Since the residual charging capacity difference value of the micro short circuit battery cell is greater than that of the normal battery cell, the micro short circuit failure battery cell can be determined based on the abnormal difference value, the calculation amount is small, and the implementation difficulty is reduced. Before calculating the residual charging capacity each time, it is determined whether it constitutes an effective full charge. Only when the charging voltage curve formed by the full charge battery cell after the completion of the current charging is close to the overall standard charging voltage curve of the battery cell, it is considered to constitute an effective full charge. The residual charging capacity of each non-full charge battery cell can be calculated using the charging voltage curve of the full charge battery cell to obtain a more accurate value, thereby effectively avoiding false prediction results.

This application discloses a method, apparatus, electronic device, and computer-readable storage medium for calculating the battery capacity equalization difference in a battery system. The battery system includes several batteries connected in series. The method includes: acquiring the charging state data of each battery during the charging process of the battery system; and calculating the open-circuit voltage V of each battery at the end of charging. end V end <V th2 All batteries were identified as Class I batteries; [V th1 V th2 [V] represents the range of significant capacity decay for the same type of battery; for the first type of battery, calculations are performed within [V]... th1 V end The first charging capacity value during the period; the difference between the standard charging capacity value and the first charging capacity value is used as the capacity balancing characteristic value of the first type of battery; the first balancing difference identification model is called to determine the true capacity difference between the first type of battery and the standard battery. This application can intuitively reflect the actual capacity balancing difference of the battery, improve the accuracy of capacity balancing calculation and simplify the calculation.

The invention provides a lithium battery failure prediction method, device and system, and belongs to the technical field of lithium battery failure. In the charging and discharging process of the lithium battery, the difference value of the residual charging capacities of two adjacent times of effective full charging is calculated based on the same battery cell, and the abnormal difference value is determined in the difference values of the battery cells. As the residual charging capacity difference value of the micro-short-circuit battery cell is larger than that of the normal battery cell, the micro-short-circuit failure battery cell can be determined based on the abnormal difference value, the calculation amount is small, and the implementation difficulty is reduced. Whether effective full charging is formed or not is judged in advance before the residual charging capacity is calculated each time, and only when the voltage difference value between the charging voltage curve formed by the fully-charged battery cell after the charging is completed and the standard charging voltage curve of the battery cell at the full charging moment is small or the overall voltage change rate is close to before the full charging is completed, the charging voltage curve formed by the fully-charged battery cell and the standard charging voltage curve of the battery cell are completely charged. Therefore, a relatively accurate value can be obtained by calculating the residual charging capacity of each non-fully-charged core by using the charging voltage curve of the fully-charged core subsequently, so that a wrong prediction result is effectively avoided.

The application provides a lithium battery lithium precipitation detection method, which comprises the following steps: charging a standard battery without lithium precipitation problem in a charging process, coupling a sinusoidal disturbance electric signal, obtaining a standard charging capacity of the standard battery and a standard battery capacity, and obtaining a reference curve; charging a test battery, coupling a sinusoidal disturbance frequency, obtaining different test charging capacities of the test battery in the charging process and a test battery capacity, and obtaining a test curve; comparing the test curve with the reference curve, when the test curve deviates from the reference curve, the charging capacity corresponding to the intersection point of the two before the test curve deviates from the reference curve is the charging capacity at which lithium precipitation occurs. The lithium battery lithium precipitation detection method has high detection efficiency and detection precision.

The invention relates to the technical field of new energy vehicles, in particular to a vehicle charging time control method, a battery management system and a vehicle. The method comprises the steps of charging a power battery based on a request charging current; estimating first charging completion time according to the current state parameter of the power battery; judging whether the charging time needs to be prolonged or not based on the first charging completion time and the expected charging completion time; if it is judged that the charging time needs to be prolonged, charging parameter values in a standard charging parameter table are adjusted based on the ratio of the first charging completion time to the expected charging completion time, and a temporary charging parameter table is generated; and obtaining a request charging current based on the current states of the vehicle and the power battery and the temporary charging parameter table, and charging the vehicle based on the request charging current so as to control the actual charging time to approach the expected charging completion time. Therefore, user customization of the charging process is realized, the safety of the battery is improved, and the service life of the battery is prolonged.

The invention provides an alternating-current charging gun and pile vehicle end diode detection circuit, and belongs to the technical field of electric vehicle charging, the alternating-current charging gun and pile vehicle end diode detection circuit comprises a Q8 and a Q10, a base electrode of the Q8 is connected to a-12V power supply through a driving resistor R70, an R90 is connected between the base electrode of the Q8 and a CP, an R91 is connected between an emitting electrode of the Q8 and a CP signal, a base electrode of the Q10 is connected to a collector electrode of the Q8 through a driving resistor R92, and the Q10 is connected to the-12V power supply. An R71 is connected between the collector electrode of the Q10 and the 5V power supply, the collector electrode of the Q10 is connected to the IO port of the MCU, and the emitter electrode of the Q10 is connected with the GND. The method improves the detection reliability, has a clear fault judgment mechanism, is suitable for a standard charging communication protocol, and is simple in circuit structure and high in integration degree.

The application provides a Europe-Japan standard conversion day standard charging adapter and a control method thereof, and relates to the technical field of charging. The adapter comprises a PE signal interface, a CP signal interface, a PP signal interface, a d1 switch, a d2 switch, a CANH signal interface, a CANL signal interface, a CSS1 signal interface, a CSS2 signal interface, a CPD signal interface, a VCP signal interface, a DC+ interface, a DC- interface, a direct-current contactor and a voltage acquisition module. When the Europe standard charging pile communicates with the adapter through PLC, the adapter acts as the role of the Europe standard vehicle end EVCC. The adapter controls the S2 switch inside the adapter, and switches the CP line state from B to C or from C to B according to the Europe standard charging process. The adapter detects the CP signal duty cycle. The adapter communicates with the Europe standard charging pile end SECC through the CP and PE, and when the Japan standard vehicle communicates with the adapter through CAN, the adapter acts as the role of the Japan standard pile. Not only the precise butt joint of the physical interface is realized, but also the compatible conversion of the charging protocol is realized, and the charging safety and the transmission efficiency are ensured.

The utility model discloses a power converter, charging and discharging equipment and a vehicle. The power converter comprises a first terminal assembly suitable for being connected with an American standard charging pile plug or an European standard charging pile plug; and the second terminal assembly is suitable for being connected with the European standard vehicle charging socket or the American standard vehicle charging socket, and the first terminal assembly is electrically connected with the second terminal assembly. The power converter is simple in overall structure, reduces potential safety hazards caused by bending and damage of the wire harness, and can effectively utilize European standard charging piles to charge European standard vehicles or effectively utilize the European standard charging piles to charge the European standard vehicles.

The invention discloses a battery pack internal fault identification method and system, and belongs to the technical field of battery safety detection, and the method comprises the steps: obtaining a standard impedance signal, a signal residual value and a standard charging and discharging quality signal of a to-be-detected battery pack; based on the internal detection area of the to-be-detected battery pack, extracting an internal detection area temperature difference and a three-dimensional hot spot form map; performing feature extraction, multi-scale feature fusion and feature mapping conversion on the to-be-detected battery pack based on a preset improved YOLOv8 model to obtain visual feature data; and based on a preset fault diagnosis model, the standard impedance signal, the signal residual value, the standard charging and discharging quality signal, the temperature difference of the internal detection area, the three-dimensional hot spot morphological graph and the visual feature data are judged, and an internal fault result of the battery pack is obtained. According to the battery pack internal fault identification method provided by the invention, comprehensive fault identification can be carried out on the interior of the battery pack.

Electric vehicle with an electric drive unit (14), a traction battery (12) with an internal DC / DC converter or battery interconnection element, which can be charged externally with at least two different charging voltages by the DC / DC converter and / or the interconnection element, and a charging interface (38) for charging the traction battery (12), which is arranged in an area of ​​a body opening (34), wherein the body opening (34) can be closed by a closing element (32), characterized in that the charging interface (38) has an actuating element (50) for setting the charging voltage and a display device (52) for displaying the set charging voltage, wherein the traction battery (12) can be charged exclusively with a standard charging voltage and a selectable charging voltage, wherein the standard charging voltage is generally preset and the selectable charging voltage can be selected by actuating the actuating element (50), wherein the standard charging voltage is lower than the selectable charging voltage.

The present application discloses a missing coating defect detection method and apparatus for an electrode sheet, an electronic device, and a storage medium. The missing coating defect detection method for an electrode sheet comprises: determining the current charging voltage plateau and the current differential capacity peak value of a battery cell on the basis of a target differential capacity curve; determining a charging voltage plateau offset of the battery cell on the basis of a standard charging voltage plateau and the current charging voltage plateau of the battery cell; determining a differential capacity peak value change rate of the battery cell on the basis of the current differential capacity peak value and a standard differential capacity peak value; on the basis of a capacity fade curve, determining capacity fade rate offsets corresponding to the first n charge-discharge cycles among N charge-discharge cycles; and when the charging voltage plateau offset is greater than or equal to a charging voltage plateau offset threshold, the differential capacity peak value change rate is greater than or equal to a differential capacity peak value change rate threshold, and the capacity fade rate offsets corresponding to the first n charge-discharge cycles are all greater than a capacity fade rate offset threshold, determining that an anode sheet missing coating defect is present in the battery cell.

The invention discloses an abnormity test method for a mobile power supply, and the method comprises the steps: obtaining complete machine time sequence data and a protocol switching event sequence of a target mobile power supply in at least one standard charging and discharging cycle process, and constructing a state feature vector, the characteristics at least comprise energy conversion efficiency characteristics of charge and discharge cycles, morphological characteristics of charge and discharge voltage curves and transient response characteristics associated with protocol switching events; inputting the state feature vector into an anomaly evaluation model, outputting a comprehensive anomaly score of the current charge-discharge cycle, comparing the comprehensive anomaly score with an anomaly judgment threshold, and performing single-cycle anomaly detection; and if the single-cycle abnormality judgment is passed, controlling the single-cycle abnormality judgment module to carry out a plurality of continuous standard charge-discharge cycle tests, obtaining a comprehensive abnormality score corresponding to each cycle so as to form a score sequence, and carrying out reliability degradation risk analysis. Therefore, more efficient and more accurate comprehensive performance evaluation of the mobile power supply is realized.

The invention relates to a lithium battery consistency detection method and system based on fiber grating strain. The method comprises the following steps: selecting a plurality of standard lithium cells with consistent initial states to form a standard battery pack, and installing a main FBG sensor and an auxiliary FBG sensor on each standard lithium cell; performing a standard charge-discharge cycle test on the standard battery pack, synchronously acquiring electrical characteristics and grating wavelength data, and resolving through a temperature compensation algorithm to obtain strain-time data; processing through an ampere-hour integral method to construct a standard strain relation curve and a standard strain threshold range; and performing the same test on all the to-be-tested lithium battery cells, obtaining a to-be-tested strain relation curve of each to-be-tested lithium battery cell, comparing the to-be-tested strain relation curve corresponding to each to-be-tested lithium battery cell with the standard strain threshold range, and generating a consistency detection result of each to-be-tested lithium battery cell. According to the method, sensitive, online and quantitative evaluation of battery consistency can be realized, and the safety, reliability and service life of the lithium battery pack can be remarkably improved.

The invention discloses a battery charging time prediction method and device and a vehicle, and relates to the technical field of battery charging. The invention aims to solve the problem of inaccurate prediction due to the fact that real-time limitation of charging equipment and vehicles is not considered in an existing fast charging time prediction method. The method provided by the invention comprises the following steps: acquiring the current SOC of the battery system; obtaining at least one vehicle side maximum charging current limit value (such as BMS and IVI instruction current) and at least one charging equipment side maximum charging current limit value (such as charging pile maximum capacity); determining a constraint maximum charging current (such as a minimum value) according to the limit values; and then, based on the current SOC, the constraint maximum charging current and a preset SOC-standard charging parameter database, the predicted full charging time is obtained through correction calculation. According to the method, multi-party real-time constraints are comprehensively considered, the prediction model is dynamically corrected, the accuracy and scene adaptability of fast charge time prediction are remarkably improved, and the user experience is optimized.

The invention discloses an electric vehicle battery comprehensive evaluation method and system based on a charging pile, and relates to the field of electric vehicle battery comprehensive evaluation, and the method comprises the steps: obtaining vehicle core operation data in real time based on a standard charging protocol, and constructing a vehicle charging data set; according to an automobile charging data set, key physical behavior features in the charging process are extracted, and a multi-dimensional feature vector used for battery state evaluation is constructed; constructing a vehicle battery function evaluation model according to the multi-dimensional feature vector for battery state evaluation, and outputting the health state of the electric vehicle battery in the charging process; and according to an output result of the vehicle battery function evaluation model, automatically generating a digital report including battery health degree evaluation, safety risk evaluation and function state evaluation. The method has the advantages that by collecting the charging data in real time and extracting the multi-dimensional features, normalized and automatic comprehensive evaluation of the battery health state, the safety risk and the system function of the electric vehicle is achieved.

Battery electric vehicle charging transmission system comprising: a first battery electric vehicle electrical connector (101) adapted for connection to a standard charging port connector (116) in a first battery electric vehicle (110a); a second battery electric vehicle electrical connector (102) adapted for connection to a standard charging port connector (116) in a second battery electric vehicle (110b); an electrical cable (103) establishing electrical contact between the first battery electric vehicle electrical connector (101) and the second battery electric vehicle electrical connector (102); and wherein each of the electrical connectors (101, 102) is arranged in electrical contact with a respective battery pack (113) located in the first and second battery electric vehicles (110b), respectively.a second battery electric vehicle (110a, 110b) is arranged, wherein at least one of the first and second battery electric vehicles (110a, 110b) is configured to calculate and display a quantity of the electric charge transferred by transferring electric current between the first and second battery electric vehicle (110a, 110b), the transferred electric charge being displayed in a selected metric corresponding to the quantity transferred.