10 results about "Discharge current" patented technology

A semiconductor integrated circuit having a built-in PLL circuit which has two charge pump circuits for charging and discharging capacitive elements of a loop filter in response to signals generated by a phase comparator circuit. One of the two charge pump circuits has current sources which generate current values smaller than those generated by current sources of the other charge pump circuit. The loop filter has a first capacitive element connected to a charge/discharge node, and a second capacitive element connected to the charge/discharge node through a resistive element. The first capacitive element is charged and discharged by the one charge pump circuit, while the second capacitive element is charged and discharged by the other charge pump circuit. A charging current source of the one charge pump circuit operates simultaneously with a discharging current source of the other charge pump circuit, i.e., the charge pump circuits operate in opposite phase.

An image forming apparatus configured to, in a state where a voltage is applied to a charging unit, determine a surface potential of an image bearing member using a first voltage applied when a current value obtained by, after applying a predetermined voltage to a transfer unit, detecting the current value while changing the applied voltage to a positive direction reaches a discharge current value, and a second voltage applied to the transfer unit when a current value obtained by, after applying the predetermined voltage to the transfer unit, detecting the current value while changing the applied voltage to a negative direction reaches the discharge current value.

The invention discloses a temperature pre-regulation system and method of a power battery pack and a thermal management system control method, and relates to the technical field of power batteries. The temperature pre-regulation control system comprises a battery pack, a thermal management system, an automobile electricity utilization load and a control system, wherein the control system comprisesa controller, an acquisition module and an instruction module; the acquisition module acquires battery pack parameter information, compares the battery pack parameter information with a preset parameter value in the controller, and controls the automobile electricity utilization load and the thermal management system through the instruction module to realize battery pack temperature pre-regulation. According to the invention, the battery pack can work in a relatively large temperature range, responses can be made in time for various problems of the battery pack, and especially when the discharge current is relatively large and the temperature rise of the battery is delayed, the flow of the cooling liquid is pre-adjusted, so that the uncontrollable condition of the battery is avoided; andmeanwhile, the controller has the functions of continuously learning and optimizing control parameters, and can carry out continuous adjustment according to the driving habit of a driver and the gradual aging of the battery.

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 relates to a battery arc discharge detection method and device and a battery energy storage system. The battery arc discharge detection method comprises the following steps: sampling theterminal voltage and charge-discharge current of a battery, sampling the terminal voltage of the battery twice, calculating a first voltage difference value, sampling the terminal voltage of the battery and the terminal voltage of an electric appliance, and calculating a second voltage difference value, and carrying out time domain and frequency domain analysis on the sampled data to obtain corresponding time domain and frequency domain characteristic values, and judging whether arc discharge characteristics are met or not based on the time domain and frequency domain characteristic values and the first and second voltage difference values so as to determine whether the battery has an arc discharge fault or not. The battery arc discharge detection device comprises a sensor module, a filter sampling circuit, a processor and a communication circuit. The battery energy storage system comprises a battery, a controller and the battery arc discharge detection device. According to the arc discharge detection method and device, arc discharge detection can be conveniently and accurately carried out on the battery, so that the safety can be improved, and a fire disaster caused by an arc discharge fault is prevented.

The invention provides a mobile terminal which comprises a first judgment module, a second judgment module and a display module. The first judgment module is used for judging the magnitude relation of electricity quality of the mobile terminal and preset electric quantity when the mobile terminal is not fully charged; the second judgment module is used for judging the magnitude relation of a discharge current value of a battery of the mobile terminal and a first preset current value when the electric quantity of the mobile terminal is larger than the preset electric quantity; the display module is used for displaying display electric quantity in a full charge state when the discharge current value of the battery of the mobile terminal is smaller than the first preset current value. The invention further provides an electric quantity display method of the mobile terminal. By means of the mobile terminal and the electric quantity display method thereof, the display electric quantity in the full charge state is displayed as long as the electricity consumption of the battery of the mobile terminal is not large, and therefore user experience is improved.

The invention relates to a method and a device for preventing a direct-current system of a power transformation and distribution substation from powering off during storage battery maintenance, belonging to the field of direct-current power supplies. The method comprises the following steps of: connecting a storage battery current relay between the anode and the cathode of a storage battery adjacent to the storage battery to be replaced to structure a direct-current bypass loop; making the charging/discharging current of a storage battery pack of the direct-current system circulate in the storage battery to be replaced by using the storage battery current relay; replacing the storage battery to be replaced; and after finishing the maintaining work, removing the electrical connection between the storage battery current relay and the storage battery loop, thereby ensuring that the original circulating loop of the charging current or discharging current of the storage battery pack of the direct-current system of the power transformation and distribution substation is recovered. The method and the device ensure continuous power supply to a secondary loop system in the process of processing the defects of the storage battery, improve maintenance working efficiency, are also convenient for maintainers to timely master the working conditions of the direct-current system, and can be widely used in the overhauling/maintaining field of direct-current power supply devices in an electric transformation and distribution system.

The present invention discloses a safe lithium ion cell, comprising a positive electrode sheet, a diaphragm, a negative electrode sheet, an electrolyte and a housing. The diaphragm comprises a first diaphragm and a second diaphragm; a winding core is assembled by using the first diaphragm, the positive electrode sheet, the second diaphragm and the negative electrode sheet in sequence; the winding core is enclosed in the housing; the electrolyte is injected into the housing; the positive electrode sheet is provided with a tab; the tab provided on the positive electrode sheet is an aluminum tab; the aluminum tab is slightly damaged, and the severity of the damage ensures that when the current flowing through the aluminum tab is more than twice the maximum discharge current of a lithium ion battery, the slightly damaged position of the aluminum tab fuses and breaks. A slightly damaged area is provided on the lithium ion battery tab, and therefore resistance in the slightly damaged area is increased. When an output current of the lithium battery is too large, the temperature of the slightly damaged area increases faster because the resistance of the tab in the slightly damaged area is larger, and the tab in the slightly damaged area fuses and breaks, thereby achieving the objective of improving battery safety.

The invention discloses a photovoltaic assembly outdoor testing device and method of programmable compensation design, which belongs to the technical field of testing. The device comprises a compensation power supply control circuit and a test loop for a photovoltaic assembly. The invention realizes the isolation of a photovoltaic assembly independent discharge loop and the photovoltaic assembly and a compensation power supply series discharge loop through the parallel relationship between a diode and a compensation power supply, adds a relay to the front end of the compensation power supply, and realizes the discharge control to the compensation power supply, so that a preset voltage value is involved in the testing of a discharge loop of the photovoltaic assembly, thereby solving the problem of the discharge current limitation of the photovoltaic assembly as the impedance in the discharge loop of the photovoltaic assembly cannot be zeroed. The compensation power supply control circuit can timely get involved in the test loop of the photovoltaic assembly, requirements for testing around the short circuit current of the photovoltaic assembly can be met, the accuracy of outside testing of the photovoltaic assembly can be improved, the electric quantity of the testing device is saved, and the testing time is prolonged.

The double-carbon accumulator consists of at least one pair of carbon electrodes and electrolyte, and features that electrolyte is set between two carbon electrodes of each pair. Under the action of the electric field and ionization, the positive charges and the negative charges move to the surface of the carbon electrodes separately to form charge layers and realize charging. The present invention has long service life, no environmental pollution, short charge period, low cost, no polarity and great discharge current.