11 results about "State of charge" patented technology

The invention belongs to the field of power battery management of electric vehicles and in particular relates to a method for estimating and revising the state of charge (SOC) in a battery management system of an electric vehicle. The method mainly comprises the following steps of: firstly, calculating the current SOC of a battery; and secondly, revising the SOC for influence of battery temperature, battery ageing and a current integration accumulated error on the SOC, wherein for the influence of the battery temperature and the battery ageing on the SOC, the SOC of the battery is revised by calculating revising factors of the battery temperature and the battery ageing and using the revising factors, and for the influence of the current integration accumulated error on the SOC, revising of the SOC is determined by judging discharging current and duration time. The method has the advantages that: by revising the SOC for the influence of the battery temperature, the battery ageing and the current integration accumulated error on the SOC, influencing factors of the error can be quite conveniently eliminated, and the revising accuracy of the SOC is improved.

A method for starting a cold or frozen fuel cell stack as efficiently and quickly as possible in a vehicle application is based upon a state of charge of a first power source such as a high voltage battery. Power flow between the first power source and fuel cell system is coordinated in conjunction with a specific load schedule and parallel control algorithms to minimize the start time required and optimize system warm-up.

A system for controlling battery usage in a mobile power supply includes a controller for monitoring a state of charge of the battery and the voltage and switching off all power from the battery when the battery reaches a predetermined power off state of charge or a low voltage condition. A switch provides power to the controller in response to receipt of power from an other source, thereby causing the controller to resume monitoring of the state of charge of the battery. When the battery reaches a predetermined power off state of charge, the controller switches off power from the battery. The switch turns the controller back on in response to receipt of power from the other source. When the battery is recharged to a predetermined restart state of charge and when the voltage reaches a restart voltage, power from the battery is switched back on.

A method for controlling a hybrid traction assembly includes an initial depleting phase which begins at the beginning of the vehicle mission and where the hybrid traction assembly is controlled to cause depletion of the storage device at a high first mean depletion rate, at least one sustaining phase where the hybrid traction assembly is controlled so that the state of charge is maintained in a predetermined sustaining range. The method further includes a second depleting phase which extends between the initial depleting phase and the sustaining phase, wherein the hybrid traction assembly is controlled to cause depletion of the storage device at a second mean depletion rate, the second mean depletion rate being lower than the first mean depletion rate.

Provided are a redox flow battery system and a method for operating a redox flow battery that suppress overcharge and overdischarge of an electrolyte.

A redox flow battery system includes a pump that supplies an electrolyte to a battery cell by circulation, a pump controller that controls a flow rate of the pump, and a measurement unit that measures at least two parameters selected from among an inlet-side state of charge of the electrolyte supplied to the battery cell, an outlet-side state of charge of the electrolyte drained from the battery cell, and a charge/discharge current input to/output from the battery cell. The pump controller includes a pump flow-rate computation unit that calculates a charge/discharge efficiency of the battery cell from the parameters measured by the measurement unit and, based on the charge/discharge efficiency, determines the flow rate of the pump so that the electrolyte drained from the battery cell is neither overcharged nor overdischarged. The pump controller also includes a pump flow-rate instruction unit that sets in the pump the flow rate determined by the pump flow-rate computation unit.

The invention discloses a charging demand calculation method for an electric automobile. The method includes the following steps: 1) describing a changing condition of a state of charge of a power battery of the electric automobile during a one-day trip process of a user through a Markov chain; 2) considering the influence of a time-consuming coefficient corresponding to a traffic index on the driving time and the probability of the trip time of the electric automobile at each time period corresponding to each of destinations during the trip process of the user, and determining a distributioncondition of the charging demand at each time of one day; and 3) obtaining time and spatial distribution of the charging demand of the electric automobile by using a Monte Carlo simulation method. Themethod considers the influence of the traffic time-consuming coefficient on the driving process of the electric automobile, and can more accurately reflect the spatial-temporal distribution of the charging demand.

The invention discloses a system, method and equipment for monitoring the internal state of a charging system. The system comprises a data acquisition module, a data analysis module, a data storage module and a display module, one end of the data acquisition module is connected to the charging system, the other end is connected with the data analysis module, the data analysis module is connected with the data storage module, and the data storage module is connected with the display module; according to the method, the real-time internal communication message of the charging system is obtained, analyzed and displayed in real time through the topology interface, the related state change curve graph is synchronously drawn, the internal operation state of the charging system is displayed in real time, and the man-machine interaction in the testing process is more friendly; communication message information of the terminal state, the module distribution state, the module output voltage and the parallel contactor driving feedback state is recorded and a curve is drawn, so that the problem reason can be preliminarily positioned.

A lead acid battery is described that makes it possible to suppress an increase in internal resistance and to accurately determine the state of charge or the state of degradation by a method of measuring the internal resistance. The lead acid battery includes an electrode plate group in which a plurality of positive electrode plates having a positive active material containing lead dioxide and a plurality of negative electrode plates having a negative active material containing metallic lead are alternately stacked with separators interposed therebetween. The electrode plate group is immersed in an electrolyte. The flatness of the positive electrode plates after chemical conversion is equal to or less than 4.0 mm

The invention provides a controller design method for suppressing low-frequency oscillation by energy storage, which constructs a frequency domain expression of the state of charge variation of an energy storage device during suppression of low-frequency oscillation based on a transfer function model, and designs a controller capable of realizing suppression of low-frequency oscillation by energystorage through the frequency domain expression. The controller designed by the invention has the beneficial effects of simple structure, stable control effect and easiness in engineering practice. Furthermore, the controller is applied to the synchronous generator grid-connected control system, and through simulation verification, the controller has a better response effect in suppressing low-frequency oscillation of a power system. Therefore, the method has a wide application prospect.

A method of estimating the state of charge of a secondary battery that has high estimation accuracy even when degradation of the secondary battery progresses is provided. Furthermore, a capacity measurement system of a secondary battery that estimates an SOC with high estimation accuracy in a short time at low cost is provided. When the capacity of a secondary battery can be estimated with high accuracy, an anomaly can also be detected in accordance with the value. A novel method of detecting an anomaly of a secondary battery is provided. In the CCCV charging method, the CC time and the CV time are used as learning parameters to construct a learning model. With this learning model, an estimated capacity value with high accuracy can be obtained with use of two data, which are the CC time and the CV time, or three data, which are the CC time, the CV time, and a charge inception voltage value as the minimum input data.