181results about "By energy-efficient charging devices" patented technology

A method and apparatus for efficiently charging lead-acid batteries applies small voltage steps to probe the charging efficiency of a battery being charged. The application of a voltage step causes the current to change from a base current to a surge current immediately after the voltage step, and to decay asymptotically to a plateau current after the surge current. A current ratio, defined as the difference between the plateau current and the base current divided by the difference between the surge current and the base current, is used as an indicator of the charging efficiency. The output voltage of the power supply charging the battery is then adjusted according to the measured current ratio. A current-voltage slope, defined as the difference between the plateau current and the base current divided by the magnitude of the voltage step, may also be used as an indicator of the charging efficiency for controlling the charging process. Alternatively, in a current-controlled charging process, small current steps are used to probe the charging efficiency. For a current step, the induced voltage changes are measured, and a transient-plateau voltage ratio is calculated. The charging current is then adjusted according to the calculated voltage ratio.

A device and method for harvesting, generating, storing, and delivering energy to a load, particularly for remote or inaccessible applications. The device preferably comprises one or more energy sources, at least one supercapacitor, at least one rechargeable battery, and a controller. The charging of the energy storage devices and the delivery of power to the load is preferably dynamically varied to maximize efficiency. A low power consumption charge pump circuit is preferably employed to collect power from low power energy sources while also enabling the delivery of higher voltage power to the load. The charging voltage is preferably programmable, enabling one device to be used for a wide range of specific applications. Also low power charge pump driver circuits for efficient scavenging of low voltage, high current energy sources.

A device and method for harvesting, generating, storing, and delivering energy to a load, particularly for remote or inaccessible applications. The device preferably comprises one or more energy sources, at least one supercapacitor, at least one rechargeable battery, and a controller. The charging of the energy storage devices and the delivery of power to the load is preferably dynamically varied to maximize efficiency. A low power consumption charge pump circuit is preferably employed to collect power from low power energy sources while also enabling the delivery of higher voltage power to the load. The charging voltage is preferably programmable, enabling one device to be used for a wide range of specific applications.

Disclosed is a method of charging a lithium-sulfur electrochemical cell wherein the lithium-sulfur cell comprises a cathode comprising an electroactive sulfur-containing material, an anode comprising lithium, and a nonaqueous electrolyte.

A rapid charging circuit for a lithium ion battery. The battery charger in accordance with the present invention compensates for the voltage drops across the various resistance elements in the battery circuit by setting the charging voltage to a level to compensate for the initial resistance of the series resistances in the circuit and an additional resistance selected to take into account the anticipated increase in resistance of the various circuit elements over time. The battery charger in accordance with the present invention periodically monitors the open-circuit voltage of the battery cell and reduces the charging voltage to when the battery cell voltage reaches the optimal value. Thus, during a constant current charging mode, the battery cell is driven at a relatively optimal charging current to reduce the charging time. As such, the system is able to optimize the charging current supplied to a battery cell during a constant current mode of operation while compensating for circuit elements whose resistance may vary over time due to temperature or other factors, such as corrosion, while at the same time avoiding exceeding the maximum recommended voltage for the battery cell.

The method includes following steps: in procedure for charging accumulator in constant electrical current, pulse current is added in good time to carry out discharge; monitoring variety of charging and discharging time values to determine state of charging accumulator; controlling quick pulse charging operation for accumulator based on charging state. Eliminating polarization phenomena quickly and effectively when charging accumulator, the invention increases speed and shortens charging time, and raises charging efficiency. Especially, the invention avoids undercharge from occurring in area, where environment of electric grid is execrable so as to prolong service life of accumulator.

The invention discloses a design scheme of an energy storage bidirectional current converter for a high-capacity storage battery. The current converter utilizes a modularization design idea and supports the idea that a plurality of branch DC / DC modules are connected in parallel and then are connected to a DC bus bar. The problems of circulation and current sharing caused by serial and parallel connection of battery packs are solved. Energy collected by the DC bus bar is exchanged with the energy of a power grid or an independent load through a backward DC / AC current converter. Due to the adoption of a technology of time-sharing rotation and dynamic hibernation, the efficiency of a system under the low power and electric energy quality at the AC and DC sides can be effectively improved so as to realize balanced use of the battery packs. Each storage battery branch is subjected to automatic and intelligent charge and discharge management, a control function and a protection function are completely independently configurated, and the highest availability of the system is ensured. An experimental result shows that the energy storage bidirectional current converter for the high-capacity storage battery has good universality, practicality and application prospect.

In an autonomous system, the method for charging a power storage element from a generator comprises temperature measurement, with switching from a first charging mode to a second charging mode in which the voltage is regulated by the temperature. The first charging mode is charging at regulated current to a maximum current value which is a function of the state of charge of the power storage element and of the temperature of the power storage element. Switching is performed when the voltage at the terminals of the power storage element reaches a preset threshold value, itself a function of the value of the current and temperature of the power storage element.

A system for optimizing battery pack charging is provided. In this system, during charging the coupling of auxiliary systems (e.g., battery cooling systems) to the external power source are delayed so that the battery pack charge rate may be optimized, limited only by the available power. Once surplus power is available, for example as the requirements of the charging system decrease, the auxiliary system or systems may be coupled to the external power source without degrading the performance of the charging system.

The invention proposes a vehicle-mounted lithium battery charger and a charging control method thereof, which can better control charging process, enables charging current and voltage to approach the optimal battery charging curve to the maximum degree and lengthens service life of the battery. The optimal charging curve of one or more than one battery pack is preset in a control module of the charger, the control module selects the corresponding optimal charging curve according to concrete batter pack information and controls output voltage and output current of a DC-DC power conversion module according to the optimal charging curve and the voltage of the rechargeable battery, the optimal charging curve is the curve for describing the optimal relation of the charging voltage and charging current of the battery pack. When voltage U of the rechargeable battery pack is less than the preset value U1, trickle charge is carried out; when U is between U1 and U2, the control module controls the output current of the DC-DC power conversion module according to the charging voltage and charging current of the rechargeable battery pack; and when U is more than the preset value U2, constant-voltage charge is charged.

The present teachings are directed toward methods of controlling the charging of a battery. The method includes the steps of receiving current and voltage output information for the battery during a charging / discharging cycle at a certain time interval, and using a model to determine both charging efficiency of the battery and the overpotential for a side reaction. These values for the charging efficiency and the overpotential of the side reaction are then compared to respective first and second given values. If either the charging efficiency or the overpotential is less than their respective given values, then the charging of the battery is suspended. The present method is particularly applicable to Li-ion batteries.

An embodiment of the invention provides a battery in-situ test device. The battery in-situ test device is characterized in that a test trigger module tests charge current from a battery end and triggers a logic control module when the charge current is smaller than a preset current threshold; the logic control module shuts down the battery charge system and directs a charge-discharge balance module to charge and then discharge the battery end; during discharge operation, a test judgment module tests voltage of the battery end and judges whether the voltage of the battery end is smaller than preset test voltage or not; if yes, a battery is judged being not in situ; if not, the battery is determined being in situ. The embodiment further provides a battery charge system and a battery in-situ test method. Through the application of the embodiment, the battery can be automatically tested in situ with no external elements, and charge efficiency is unaffected during the test process.

A power supply device, comprising first and second lead terminals for connection with a load, a fuel cell, an energy storage element connected between the first and second lead terminals, a synchronous-rectification switching power-source portion for converting the output voltage of the fuel cell to the output voltage of the energy storage element and outputting it to the first and second lead terminals, and a current-detecting portion for detecting the output current of the fuel cell, the switching power-source portion further comprising a first switching element connected to the energy storage element in series, a second switching element connected to the energy storage element in parallel, and a simultaneous-turn-off controller for turning off the first and second switching elements simultaneously when the output current detected by the current-detecting portion is not larger than a preset current threshold.

The invention discloses a charging method and a charging system for a battery pack. The system comprises a monitoring device used for monitoring the voltage of the battery pack, charging current and charging time and a charging control device used for respectively carrying out constant current charging, constant voltage charging and floating charging on the battery pack according to the voltage of the battery pack, the charging current and the charging time. With the charging method and the charging system for the battery pack, through monitoring the voltage of the battery pack, the charging current and the charging time in the process of charging, charging of the battery pack in different phases is carried out according to monitoring results; so reduction in the service life of batteries caused by over charging or insufficient charging of the battery pack is avoided, and charging efficiency is improved while charging safety of the battery pack is guaranteed.

A system for optimizing battery pack charging is provided. In this system, during charging the coupling of auxiliary systems (e.g., battery cooling systems) to the external power source are delayed so that the battery pack charge rate may be optimized, limited only by the available power. Once surplus power is available, for example as the requirements of the charging system decrease, the auxiliary system or systems may be coupled to the external power source without degrading the performance of the charging system.

A rapid charging circuit for a lithium ion battery. The battery charger in accordance with the present invention compensates for the voltage drops across the various resistance elements in the battery circuit by setting the charging voltage to a level to compensate for the initial resistance of the series resistances in the circuit and an additional resistance selected to take into account the anticipated increase in resistance of the various circuit elements over time. The battery charger in accordance with the present invention periodically monitors the open-circuit voltage of the battery cell and reduces the charging voltage to when the battery cell voltage reaches the optimal value. Thus, during a constant current charging mode, the battery cell is driven at a relatively optimal charging current to reduce the charging time. As such, the system is able to optimize the charging current supplied to a battery cell during a constant current mode of operation while compensating for circuit elements whose resistance may vary over time due to temperature or other factors, such as corrosion, while at the same time avoiding exceeding the maximum recommended voltage for the battery cell.

The invention relates to a maximum power point tracking method for an independent photovoltaic power generation system, and belongs to the technical field of photovoltaic power generation. A control system for a Buck circuit to charge a storage battery is utilized by a photovoltaic array, and the duty cycle of an MOSFET switching tube in a Buck charging circuit is directly controlled by utilizing a differential value of power to voltage, so the maximum power output of the photovoltaic array can be maintained under the condition that the luminance and ambient temperature are changed, and the storage battery is quickly charged in an optimization way. The maximum power point tracking method has the advantages of simpleness, directness and effectiveness; when the illumination intensity is suddenly increased or a cloud in the air comes, the method can make the system respond quickly and can timely lock the system to work at the maximum power working point, so energy loss is effectively prevented, the system efficiency is improved, and the system cost is indirectly reduced.

The embodiment of the invention provides a charging method, assembly and terminal. The method comprises the steps that a charging module assembly receives an input current of a power supply device, wherein the charging module assembly comprises at least two charging modules; the charging module assembly controls the input current through the charging modules to generate an output current, wherein the output current comprises charging currents generated when the charging modules of the charging module assembly control the input current; the charging module assembly outputs the output current to a battery of the terminal. According to the charging method, assembly and terminal, heat dissipation efficiency and charging efficiency can be improved.

The present invention discloses a charger circuit. The charger circuit comprises a control circuit and at least two charging paths. The control circuit determines to activate or inactivate each charging path according to a battery feedback signal representing the charging status. Accordingly, the battery is charged by input power in an optimal way so that the charging efficiency is improved and the overheating problem is solved.

A charging current for a secondary battery is reduced when the secondary battery voltage gets close to a previously set constant voltage. When the charging current has become less than a charging completion current value as a reference for determining whether the charging has been completed, a charging control sequence circuit determines that the charging of the secondary battery has been completed and proceeds to a first flow consumption current mode. The charging control sequence circuit turns off a first switch to cut off an electrical connection to stop the operation of the charging control circuit, whereby a switching element and a switching element for synchronous rectification are turned off to cut-off electrical connections so that the charging current becomes 0 mA.

The invention relates to a high-capacity lithium battery pack, which is provided with a lithium battery pack (1), a charging interface, a discharging interface, a battery protection plate (2), an electric quantity indicating lamp (5), a charging fuse (6), a temperature control charging switch (7) and a discharging fuse (8), wherein the lithium battery pack (1) is formed by connecting a plurality of single battery cells in series; the charging interface and the discharging interface consist of female plugs (3a, 3b) and male plugs (4a, 4b); and the battery protection plate (2) is used for over charge, over discharge and over current protection and battery cell voltage balance of the lithium battery pack (1). Because the high-capacity lithium battery pack is adopted in the lithium battery pack, the lithium battery pack has the advantages of small volume, light weight, portability, easiness for carrying, high power capacity, high-energy density, high efficiency, high bearing capacity, long cycle life, low self-discharge rate, no memory effect, no pollution, excellent constant-voltage source performance and the like; and through the battery protection plate, adverse conditions of over charge, over discharge, over current, over high voltage of the single battery cells and the like are effectively prevented, the quality of the lithium battery pack is remarkably improved, and the lithium battery pack has the advantages of stable performance and long life.

The invention discloses a switch charging circuit and a power management system. The switch charging circuit comprises a system power end, a battery end, a reference power end, a charging enable signal end, a battery-powered judgment signal end and a switch charging module. The switch charging module comprises a switch charging control logic module, a charging voltage control module, a charging current control module, a pulse width control module and a switch power level. The power management system comprises a first voltage comparison module, a second voltage comparison module, a logic control module, a first voltage maintenance module, a second voltage maintenance module, a first switch unit, a second switch unit, the reference power end, an external power input end, the system power end, the battery end, the switch charging module and a first voltage conversion module. The switch charging circuit and the power management system are simple in implementation and high in charging efficiency.

The present invention provides a discharge method for a hybrid battery pack to thereby extend its usage life. The discharge method determines which one of the battery sets installed in a hybrid battery pack should be held active to discharge electricity according to their parameters of battery state of health (SOH), wherein at least two of the battery sets are different in cell type. Accordingly, the method can optimize the discharging efficiency of the hybrid battery pack and then extend its usage life.

The embodiment of the invention discloses a device for charging a battery, comprising a detecting unit and a first judging unit, wherein the first detecting unit is used for detecting the current voltage value of the battery; the first judging unit is used for detecting whether the voltage of the battery in the current charging section is up to the charging limit voltage; if yes, the current value of charging current of the battery is adjusted and the battery is charged by the adjusted constant current; if no, the battery is continuously charged by the current constant electric current. The device ensures that a battery charger charges batteries with different types and improves the compatibility with the battery charger.

The invention relates to the technical field of charging and in particular relates to a charging device and method with adjustable output current in a constant current charging stage. The device comprises a charging driving part which is used for charging a battery, a current sampling unit which is used for sampling a charging output current and converting the current into a feedback voltage signal and a control unit which is used for outputting a set voltage, wherein the set voltage and the voltage output by the current sampling unit are merged into a feedback voltage of current and the feedback voltage is fed back to the charging driving part. By adopting the embodiment of the invention, different quantities of batteries connected in series can be charged, the charging cost is reduced, and an appropriate constant current stage charging current is set according to batteries in different capacities, thus the charging device and method provided by the invention can meet requirements of multiple charging batteries; meanwhile, the current can be regulated in a constant current charging process, thus the charging process can adapt to battery states such as the state that temperature of the battery is changed.