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

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 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.

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.

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 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 method and apparatus for controlling the charge and discharge currents in a battery (2) as a function of temperature. When a battery (2) is charged or discharged in an environment that approaches its design operating temperature extreme, the currents are reduced to limit self-heating of the battery and thus extend the useful operating environment temperature range. A temperature sensor (18) is coupled to a controller (6) to sense the battery (2) temperature. The temperature information is used to set a suitable charging or discharging current (8).

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.

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 method and apparatus for communicating a battery information to a remote device or database. The battery tester and / or charger can communicate with a wired or wireless connection to the remote device. Battery indentifying information, test results and warranty information can be communicated to the remote device or database.

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 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.

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.