483 results about "Charge rate" patented technology

The invention relates to the technical field of current compensation, and discloses a current compensation strategy and a compensation system for improving the direct current fast charging rate of an electric automobile. According to the scheme, the total current of a high-voltage loop and the input current of a battery are detected in real time, the dynamic load current difference value is calculated, and the battery health state and historical charging data are combined; and the charging pile request current value is adaptively adjusted to counteract the shunting influence of the load power. Meanwhile, a closed-loop feedback regulation mechanism is adopted, a compensation coefficient is corrected in real time through a PID algorithm, and the stability of the charging current is ensured. When the power of the charging pile is limited, the system dynamically reduces unnecessary loads (such as an air conditioner and a heater) according to a preset priority request, and the charging power of the battery is guaranteed preferentially. The charging rate is improved (the charging time is shortened by 10%-15%), the adaptability of the system to dynamic load fluctuation is enhanced, and the service life of the battery is prolonged.

The application discloses a kind of fast charging method and device of lithium ion battery, it is related to power battery charge-discharge technical field.The application aims at the problem that the fast charging method of existing lithium battery cannot better adapt to the state of lithium battery in different charging stages.The SOC interval is selected in the application, and the SOC interval is divided into several charging stages with the defined ΔSOC as interval;The residual life prediction value of lithium ion battery is obtained according to the temperature, state of charge, charge rate and charge cycle number of lithium ion battery;The characteristic curve of lithium ion battery is obtained, and the charge time weight α of each charging stage is obtained according to the charge characteristic curve;The charging current of each charging stage is obtained by inputting the charging time, charge time weight and residual life prediction value into target equation.The application effectively prolongs the service life of battery while ensuring safe and fast charging.

The invention discloses a lithium ion battery charging method, a control system and a storage medium, and the charging method comprises the steps: carrying out the multi-stage charging according to a plurality of divided SOC intervals, and carrying out the constant-current charging of each SOC interval through employing different charging rates. The plurality of SOC intervals are divided according to a peak value or an inflection point of a differential voltage curve calculated by a charge-discharge test of the target battery; the charging rate adopted by each SOC interval is calculated through the following formula: n is the target total charging time, and the unit is h; i and j represent the i or j SOC interval; m is the number of the divided SOC intervals; rj is the percentage of the j-th SOC interval needing to be charged; d is the negative electrode solid phase diffusion coefficient of the corresponding SOC interval. A lithium intercalation reaction stage is identified by analyzing a differential voltage curve, and key kinetic parameters are tested, so that an internal kinetic limit is finally converted into an external executable charging rate, and safe and efficient rapid charging is realized.

The invention provides a display device and a display method. The display device comprises a display panel and a driving chip, the driving chip comprises a voltage regulating unit, an overvoltage driving unit and a triggering unit; the trigger unit is used for detecting whether the current display picture of the display panel is a heavy-load picture or not, and when the display picture is the heavy-load picture, the trigger voltage regulation unit and the overvoltage driving unit are triggered to work cooperatively; the voltage adjusting unit is used for adjusting a target driving voltage corresponding to a target gray scale in the liquid crystal driving voltmeter, so that the lighting effect reaches the preset brightness when the display panel displays a white picture; the overvoltage driving unit is used for starting a driving function, adjusting the parameter configuration table and performing overvoltage driving on a data line of the display panel based on the parameter configuration table and the target driving voltage so as to improve the charging rate of the heavy-load picture, so that the charging rate is improved by detecting the heavy-load picture and cooperatively adjusting the voltage and overvoltage driving, and the charging efficiency is improved. The method has the advantages of improving the charging rate of a heavy-load picture, eliminating display defects and improving the display quality.

A control system for pre-conditioning a refuse vehicle includes processing circuitry. The processing circuitry is configured to obtain a scheduled deployment time of the refuse vehicle. The processing circuitry is also configured to perform a first pre-conditioning operation by operating a charging system to charge batteries of the refuse vehicle at a first charge rate over a first time interval, and a second charge rate over a second time interval to fully charge the batteries by the scheduled deployment time. The charging system is configured to provide direct current (DC) electrical energy to the batteries for charging. The processing circuitry is also configured to perform multiple other pre-conditioning operations at least partially simultaneously with performing the first pre-conditioning operation.

The invention provides a charging remaining time prediction method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring an initial temperature, an initial state of charge and an initial charging rate of a target battery at an initial moment; the initial temperature, the initial charging rate and the sum value of the initial charge state and the preset charge state step length are used as input, and the temperature of the target battery at the end point of each prediction interval is predicted through a temperature rise prediction network; the preset state-of-charge step length is used for indicating the state-of-charge variation of the adjacent prediction intervals; determining the charging rate of the target battery in each prediction interval from the mapping relation between the temperature and the charge state of the target battery and the charging rate; the preset charge state step length is compared with the charging rate of the target battery in the prediction interval, and the charging time of the target battery in each prediction interval is determined; and determining the sum value of the charging durations of all the prediction intervals as the charging remaining time of the target battery.

Provided are a secondary battery and an electronic apparatus. The secondary battery comprises a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte, wherein the negative electrode sheet comprises a negative electrode current collector and a negative electrode material layer located on at least one surface of the negative electrode current collector; the negative electrode material layer comprises a negative electrode active material; the negative electrode active material comprises a silicon-carbon composite material; on a plane formed by the direction of length of the negative electrode sheet and the direction of thickness thereof, the minimum value of an interior angle of an outer contour of a particle with a maximum circumscribed-circle diameter of greater than 10 μm in the silicon-carbon composite material is A°; and the thickness of the separator is B μm, where 488≤A×B≤3600, and 4≤B≤25. The secondary battery has good self-discharge performance, charging rate performance and cycling performance.

Provided is a device for determining the feasibility of operation, based on an operation plan, of a storage battery, the device comprising: a simulation unit for simulating at least one of the state of charge, temperature, and charging / discharging current of the storage battery when a charging / discharging operation is performed in the storage battery according to the contents of the operation plan; a determination unit for determining the feasibility of operation of the storage battery according to the operation plan, using, as determination target indexes, a result of the simulation and a setting value of a charging / discharging output for each unit time segment described in the operation plan; and a modification unit capable of modifying the operation plan when it is determined that the operation is not feasible. When at least one of the determination target indexes does not fall within an allowable range, it is determined that the operation is infeasible, and the operation plan can be modified by adjusting the setting value of the charge / discharge output for each unit time segment in the operation plan determined to be infeasible. When the operation plan is modified, the operation feasibility is determined for the modified operation plan.

The invention provides a charging strategy lithium precipitation boundary window evaluation method and system, and belongs to the field of lithium ion batteries. The method comprises the following steps: manufacturing a lithium ion battery comprising a positive pole piece, a negative pole piece, a diaphragm and an electrolyte; performing a rate charging test on the lithium ion battery at a set rate to obtain constant-current charging capacity and constant-current and constant-voltage charging capacity of the battery under different rates, and calculating a constant-current charge-in ratio; calculating the maximum SOC when the battery cell reaches the lithium precipitation boundary under different charging rates, and formulating a stepped charging strategy according to the maximum SOC; and according to the obtained stepped charging strategy, carrying out a cell charging and discharging cycle test, and judging the lithium precipitation condition of the cell. The method does not need to depend on a three-electrode tool and a special battery device, the lithium precipitation boundary window can be rapidly and efficiently evaluated, the established charging strategy can ensure that lithium precipitation does not occur in the battery cell under the rapid charging condition, and the rapid charging strategy establishment efficiency and the cycle performance and safety of the battery are remarkably improved.

The invention discloses a quick-charging low-voltage platform high-capacity battery system for an electric forklift, and the system comprises a battery module which is installed on the electric forklift and supplies power to the electric forklift; the box body is mounted on the electric forklift; the two charging seats are arranged outside the box body and are used for being connected with a charging gun of a charger; the electric control system is arranged in the box body, the input end of the electric control system is connected with the two charging seats, and the discharge port of the electric control system is arranged on the box body and connected with the battery module; according to the battery module, the low-temperature-rise battery cell is used, the heating value is reduced from the source in the charging process, the charging rate is improved on the premise that a liquid cooling system is not used, the double-gun charging technology can be used for a high-capacity battery, the charging current is improved, and the purpose of rapid charging is achieved.

A battery cell, a lithium ion battery, and an electric device. The battery cell comprises a wound electrode assembly, and the wound electrode assembly has bent areas. The wound electrode assembly comprises a negative electrode sheet and a positive electrode sheet, the negative electrode sheet comprises a plurality of first bent portions located in the bent areas, and the positive electrode sheet comprises a plurality of second bent portions located in the bent areas; the distance L1 between the concave surface of a second bent portion and the convex surface of an adjacent first bent portion located on the inner side of the second bent portion is greater than or equal to the distance L2 between the convex surface of the second bent portion and the concave surface of an adjacent first bent portion located on the outer side of the second bent portion, 17 μm≤L1≤34 μm, 14 μm≤L2≤34 μm, and L1≥L2; the equivalent charge rate c of the battery cell from 10% SOC to 80% SOC satisfies: 3C≤c≤8C. The battery cell can enable fast-charging lithium ion batteries to have good cycle performance and safety performance.

Systems and methods for determining a total chargeable / dischargeable energy of a subsystem of a battery energy storage system (BESS) are disclosed. An iterative process is executed over a dynamic time period divided into iterations using a neural network model comprising an energy prediction sub-model and a state prediction sub-model. The energy prediction sub-model outputs a chargeable / dischargeable energy of the subsystem for the current iteration. The state prediction sub-model outputs a voltage of the subsystem for a next iteration, the charge rate of the subsystem for the next iteration, the maximum temperature of the subsystem for the next iteration, and a charge rate difference for the next iteration. A total chargeable / dischargeable energy of the BESS subsystem is determined by summing the dischargeable energies determined for each iteration.

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 provides a charging pile power adaptive regulation and control method and device, and relates to the technical field of power adaptive regulation and control. The method comprises the following steps: firstly, setting regulation and control points according to a preset time interval, collecting a station total incoming line available power upper limit, total active power and charging state data of each charging pile, and calculating a demand priority score of each charging pile based on a current battery charge state and a historical power distribution condition; generating a plurality of candidate strategies according to positive and negative total power margin, and respectively implementing differential power increase and decrease for high and low demand priority piles; according to the charging rate curve, simulating the total charging completion time of all the charging piles under each strategy, selecting the strategy with the shortest total time as a comprehensive optimal strategy, and determining the target distribution power of the next regulation and control point of each pile; and finally, smoothly issuing a power instruction to a power control unit of each pile through slope rate limitation. On the premise of guaranteeing the safety of the power grid, the overall charging efficiency and the user satisfaction degree of the station can be remarkably improved.

The invention discloses a charging voltage control method and system for a capacitive energy storage welding machine, and the method comprises the steps: monitoring the voltage, current and temperature of a capacitor in real time in a charging process, and obtaining data through a sensor, and inputting the data into a controller; the controller dynamically adjusts the charging voltage according to the real-time feedback, and calculates and adjusts the power output by adopting a self-adaptive algorithm; if the temperature of the capacitor reaches the set threshold value, the charging voltage is automatically adjusted or the charging rate is reduced, and the charging voltage is adjusted according to the welding load change; the upper limit of the charging voltage and the charging time are dynamically adjusted according to the working state of the capacitor through an optimization algorithm, so that the capacitor is ensured to operate in a safe interval; the system combines welding parameters, dynamically optimizes charging voltage and current output, and ensures that the charging process is stable and efficient.

Systems, apparatuses, methods, and computer program products are disclosed for geofence-based induction charging system. An example method includes identifying an EV by validating vehicle parameters using vehicle identification circuitry and identifying a geofence charging area by comparing vehicle geolocation data with geofence area data using geofence circuitry. The example method further includes generating an entry token and an exit token for the EV using token generation circuitry, and generating a charging transaction for the EV based on the entry token and the exit token using payment transaction circuitry. The entry token comprises at least one or more of a vehicle identifier, an entry timestamp, an entry location, or an entry power level, and the exit token comprises at least one or more of the vehicle identifier, an exit timestamp, an exit location, an updated self-charging rate, an updated power consumption rate, or an exit power level.

The invention provides an energy storage battery thermal management method and system. The method comprises the following steps: collecting state information of a target battery pack, wherein the state information comprises a health state value, a cycle index and a current charging rate; acquiring temperature information of the target battery pack; for the state information, a preset state-temperature threshold mapping database is called, and basic temperature thresholds corresponding to the health state value, the cycle index and the current charging rate of the state information are obtained through matching; determining a weight corresponding to each piece of state information according to a preset dynamic weight distribution rule, and performing weighted calculation on each basic temperature threshold according to the weight to obtain an optimal temperature threshold of thermal management of the target battery pack; and performing thermal management control on the target battery pack based on the optimal temperature threshold and the temperature information. According to the invention, the problems of high risk, waste of energy consumption, poor scene adaptability and the like in the aspect of thermal management of the energy storage battery can be solved.

A device includes an AC impedance circuit to apply an AC excitation signal to a set of battery cells of a battery pack. The device includes a controller to determine a battery pack identification (ID) value from a battery pack identification (ID) circuit of the battery pack, calculate an impedance value of the battery pack based on the AC excitation signal, identify a maximum charging rate to charge the battery pack using the battery pack ID value of the battery pack and the impedance value of the battery pack, where the battery pack is one of at least two battery packs having a same battery pack ID value with different maximum charging rates, and set a charging rate to charge the battery pack using the maximum charging rate.

An energy management system providing logical control of the flow of energy between an electrical utility, Battery Energy Storage System and a load such as an electrical vehicle that is being recharged via direct current fast charging. Power is selectively delivered to the Battery Energy Storage System (i.e. charging) or from the Battery Energy Storage System (i.e. discharging), to a rapid DC charging station. The Battery Energy Storage System thus provides added capability to increase the overall output available from the utility, enabling charge rates that exceed the output capacity of the utility supply.

A method for evaluating a life of a secondary battery, including an evaluation condition input process of inputting a temperature, a charging rate, and a discharging rate to evaluate the life of the secondary battery, a data computation process of computing an evaluation period, in which a state of health of the secondary battery reaches a set range, a capacity degradation rate, and a direct current internal resistance change rate, and an acceleration factor calculation process of calculating an acceleration factor of the secondary battery using a first equation, the first equation being that the acceleration factor is equal to the direct current internal resistance increase rate divided by the capacity degradation rate.

A battery charging control method, a device, and a storage medium. A charging interval is divided into a plurality of charging sub-intervals; and for an objective function of a total charging duration, within which a battery is charged from an initial charge state to a target charge state, with respect to the temperatures of the charging sub-intervals, by using a minimum total charging duration as an objective, and using a maximum allowable charging rate of the battery or a maximum allowable temperature of the battery representing a lithium precipitation safety threshold of the battery under different charge states and temperature conditions as a constraint condition, the solution of the objective function is optimized. The temperature rise of the battery is reduced while the charging duration is minimized, thereby avoiding lithium plating during charging of the battery and improving the charging safety.

An electrified vehicle includes a human-machine interface to enable towed vehicle mode and specify a desired traction battery charge upon arrival at a destination. A controller is programmed to vary charging rate of the traction battery while the electrified vehicle is being towed over a user-specified distance to the destination to obtain the user-specified target charge for the traction battery upon reaching the destination. The target charge may be entered as a percentage state of charge (SOC), a distance to empty (DTE), or Watt hours, and converted to net energy input required for the traction battery. The controller distributes the charging load over the entire distance to reduce the affect on the drivability and efficiency of the towing vehicle by varying regenerative braking of the electric machine(s) while being towed to provide a net energy needed to obtain the target charge upon reaching the destination.

The invention discloses a battery charging control method and a charging system. The method comprises the following steps: acquiring a battery voltage and a battery temperature, and determining a target jump voltage interval in which the battery voltage falls; determining candidate charging multiplying power corresponding to the battery voltage and the battery temperature from the plurality of charging multiplying power according to a charging multiplying power lookup table; taking a smaller value from a preset charging rate upper limit and a candidate charging rate corresponding to the target jump voltage interval as a target charging rate; according to the target charging rate and the rated battery capacity, a charging current is requested from the power supply equipment to charge the battery, and the voltage of the charged battery and the temperature of the charged battery are obtained; and updating the battery voltage by using the charged battery voltage and updating the battery temperature by using the charged battery temperature, and returning to the step of determining the target jump voltage interval in which the battery voltage falls until the battery is charged. According to the embodiment of the invention, the charging efficiency of the battery can be improved.

To provide a battery system which includes a battery cell with a cell thickness, which increases as a charging rate rises and decreases as the charging rate lowers, and yet makes a tab of the battery cell and the battery cell itself less likely to bend when the battery cell is connected to a bus bar.SOLUTION: A battery system includes: a cell laminate in which a plurality of battery cells are laminated; a battery module which includes a pair of end plates disposed at both ends in a lamination direction of the cell laminate and in which a cushion is disposed in at least one of a space between the battery cell and the battery cell and a space between the battery cell and the end plate; and a cell thickness controller which controls cell thicknesses of the battery cells in each cell laminate.SELECTED DRAWING: Figure 1

The invention relates to a lithium ion charging control method and device, equipment, a medium and a product. The method comprises the following steps: acquiring state information of a lithium ion battery to be charged; the state information comprises a negative electrode potential value and a battery temperature value of the lithium ion battery to be charged; determining at least one charging current threshold value in the charging process of the to-be-charged lithium ion battery based on the state information and a preset mapping relation; the preset mapping relation comprises a mapping relation among a battery temperature value, a battery cathode potential value and a charging current value; the preset mapping relation is obtained by performing a charging test on the to-be-tested lithium ion battery according to negative electrode potential boundary values of the to-be-tested lithium ion battery at different charging rates at different battery temperatures; and controlling the charging current of the lithium ion battery to be charged according to the at least one charging current threshold value. By adopting the method, the charging current threshold value can be dynamically adjusted according to the charging state of the lithium ion battery, so that the safety of the lithium ion battery during fast charging is improved.

This invention provides a method for accurately estimating the internal temperature of a secondary battery while considering the state of charge (SOC) and charge / discharge state. The method is a method (80) for estimating the internal temperature (T) of a vehicle secondary battery (1), comprising a repeatedly executed change determination process (50) and a repeatedly executed internal temperature estimation process (60, 60'). The change determination process includes: (54) a step of determining a first change (21) in the internal resistance (R) relative to the charge rate (SOC) based on the voltage (V) and charge / discharge current (I) of the secondary battery when the vehicle is stationary or at the start of driving; and (22) a step of determining a second change (22) in the internal resistance relative to the charge rate based on the voltage and charge / discharge current during vehicle operation. Step (57) of the internal temperature estimation process includes: measuring the external temperature (To) of the secondary battery (62); measuring the charge and discharge current (63); calculating the charge rate (64); determining whether the secondary battery is discharging (66); selecting a first change when discharging (67); selecting a second change when not discharging (68); calculating the internal resistance based on the selected change and the calculated charge rate (69); and estimating the internal temperature based on the external temperature, charge and discharge current, and internal resistance (70).

In the primary adjustment power supply operation of grid-connected batteries in the supply and demand adjustment market, this invention provides a battery control device that avoids interruptions due to insufficient charge and enables continuous supply over a long period of time. [Solution] The system includes a frequency monitoring unit that monitors the frequency from the power grid, a charge rate monitoring unit that monitors the charge rate of the storage battery, a target output correction unit that corrects the target output of the droop characteristic, which is the amount of output change per unit of frequency change at frequencies other than the dead zone, within the range of the upper limit droop characteristic and the lower limit droop characteristic, according to the charge rate, and a control unit that controls the charging or discharging of the storage battery with the target output corrected by the target output correction unit, wherein the target output correction unit corrects the target output toward the lower limit droop characteristic when the charge rate falls below a threshold, and / or corrects the target output toward the upper limit droop characteristic when the charge rate exceeds a threshold.

The application provides a capacity correction method of a battery pack, comprising the following steps: performing static test and charging experiment on an electric core in advance to obtain a curve of the electric core aging, temperature, circuit and OCV and a relationship table of aging degree, battery temperature, open circuit voltage and electric quantity value at different time in a charging process; obtaining a best charging rate relationship table of the electric core at different temperatures and electric quantities; obtaining the electric quantity of each electric core of the battery pack, the real-time electric quantity of each electric core and the real-time electric quantity of the battery pack in a static state; searching the relationship table of aging degree, battery temperature, open circuit voltage and electric quantity SOC n value at different time in the charging process, selecting different charging rates for charging by searching the best charging rate relationship table of the electric core at different temperatures and electric quantities according to the electric quantity of the battery pack at the end time of the charging process estimated by ampere-hour integral, and correcting the capacity of the battery pack and stopping charging, thereby improving the problems of early ending or not fully charging of the battery pack.

The application provides a lithium ion battery life prediction method, device, equipment, medium and program product. Cycle life tests are respectively performed on sample lithium ion batteries under different test temperatures and different charge rates, and cycle numbers and corresponding capacity retention rates are obtained. Different cycle life prediction models are obtained through function fitting according to the cycle numbers and corresponding capacity retention rates obtained under different test temperatures and different charge rates. A cycle life prediction model applicable to a lithium ion battery to be tested is determined according to the test temperature and the charge rate of the lithium ion battery to be tested. The cycle life prediction model is determined, and the cycle number of the lithium ion battery to be tested is used to predict the life of the lithium ion battery. The battery capacity retention rate is quickly and accurately obtained, which has guiding significance for optimizing long-term cycle conditions of the battery and prolonging the endurance life of the battery.