Abstract: This disclosure provides systems, methods and apparatus for managing a capacitor system. In one aspect, an energy storage system includes a capacitor system, a charging circuit, and a controller. The capacitor system includes one or more capacitors. The charging circuit is configured to charge the capacitor system to a first target voltage. The controller is configured to detect a first condition and is programmed, in response to the first condition, to instruct the charging circuit to charge the capacitor system to a second target voltage that is less than the first target voltage. The controller is programmed to provide a notification that the capacitor system is operating in a degraded state.

Abstract: This disclosure provides apparatus, methods and systems for error correction in multi processor systems. Some implementations include a plurality of computing modules, each computing module including a processor. Each processor may include processing state. In some other implementations, each computing module may also include a memory. Upon receiving a signal to perform a partial re-synchronization, a hash of each processor's state data may be performed. In some embodiments, a hash of at least a portion of each computing module's memory data may also be performed. The hashes for each processor are then compared to determine majority hashes and possible minority hashes. Upon identifying a minority hash, the computing module that produced the minority hash may receive new processing state data from one of the computing modules that produced a majority hash.

Abstract: This disclosure provides collector plates for an energy storage device, energy storage devices with a collector plate, and methods for manufacturing the same. In one aspect, a collector plate includes a body. One or more apertures extend into the body. The apertures are configured to allow a portion of a free end of a spirally wound current collector of a spirally wound electrode for an energy storage device to extend into the one or more apertures.

Abstract: An energy storage device can have a first graphite film, a second graphite film and an electrode divider ring between the first graphite film and the second graphite film, forming a sealed enclosure. The energy storage device may be compatible with an aqueous electrolyte or a non-aqueous electrolyte. A method of forming an energy storage device can include providing an electrode divider ring, a first graphite film and a second graphite film. The method can include pressing a first edge of the electrode divider ring into a surface of the first graphite film, and pressing a second opposing edge of the electrode divider ring into a surface of the second graphite film to form a sealed enclosure. The sealed enclosure may have as opposing surfaces the surface of the first graphite film and the surface of the second graphite film.

Abstract: Dry process based energy storage device structures and methods for using a dry adhesive therein are disclosed.

Abstract: Methods and systems of operating a computer system including a processor are disclosed. In one aspect, a method includes providing a discretized operating system for controlling applications executed by the computer system, and replacing an idle task of the discretized operating system with a substitute idle task that causes the processor to enter a dormant mode, a priority level of the substitute idle task being the same as a priority level of the idle task.

Abstract: An electric double-layer ultracapacitor configured to maintain desired operation at an operating voltage of three volts, where the capacitor includes a housing component, a first and a second current collector, a positive and a negative electrode electrically coupled to one of the first and second current collectors, and a separator positioned between the positive and the negative electrode. The capacitor may also include an electrolyte in ionic contact with the electrodes and the separator, the electrolyte having acetonitrile and a quaternary ammonium salt with a molarity of less than one.

Abstract: An electric double-layer ultracapacitor configured to maintain desired operation at an operating voltage of three volts, where the capacitor includes a housing component, a first and a second current collector, a positive and a negative electrode electrically coupled to one of the first and second current collectors, and a separator positioned between the positive and the negative electrode. At least one of the positive electrode and the negative electrode can include a treated carbon material, where the treated carbon material includes a reduction in a number of hydrogen-containing functional groups, nitrogen-containing functional groups and/or oxygen-containing functional groups.

Abstract: An electric double-layer ultracapacitor configured to maintain desired operation at an operating voltage of three volts, where the capacitor includes a housing component, a first and a second current collector, a positive and a negative electrode electrically coupled to one of the first and second current collectors, a separator positioned between the positive and the negative electrode, and an electrolyte in ionic contact with the electrodes and the separator. At least one of the positive electrode and the negative electrode can be made of a carbon based layer having a mesoporosity and/or a microporosity optimized for ionic mobility therewithin.

Abstract: An electric double-layer ultracapacitor configured to maintain desired operation at an operating voltage of three volts, where the capacitor includes a housing component, a first and a second current collector, a positive and a negative electrode electrically coupled to one of the first and second current collectors, and a separator positioned between the positive and the negative electrode. The capacitor may also include a protective coating disposed on an inner surface of the housing for the ultracapacitor.

Abstract: A method for reducing power consumption and heat generation in a computer system employs a substitute idle task that puts the processor into a dormant mode, e.g., sleep, nap, or doze mode. The substitute idle task replaces a conventional operating system idle task. The substitute idle task may have a low priority, such as that of the conventional idle task, which it replaces. At each occurrence of a quantum interrupt, a task scheduler schedules applications for execution during the accompanying time slice. After the scheduled applications are done, the substitute idle task is executed. The dormant mode caused by the idle task reduces the system's power consumption. The idle task may also have a high priority and be designed to run for a predetermined percentage of time. As the processor spends the predetermined percentage of time in the dormant mode, known power consumption reduction may be guaranteed in the system.

Abstract: A method of making an active electrode material is provided. Activated carbon having between about 70 and 98 percent microporous activated carbon particles of a total amount of activated carbon by weight and between about 2 and 30 percent mesoporous activated carbon particles of the total amount of activated carbon by weight is provided. Binder is provided. The activated carbon and the binder is mixed to form an active electrode material mixture. In some implementations, a method of making an electrode film includes forming a film of active electrode material comprising activated carbon having between about 70 and 98 percent microporous activated carbon particles of a total amount of activated carbon by weight and between about 2 and 30 percent mesoporous activated carbon particles of the total amount of activated carbon by weight. The method further includes bonding the film to a current collector to form an electrode film.

Abstract: This disclosure provides systems, methods and apparatus for a battery system. The battery system includes an enclosure, a battery disposed within the enclosure; and at least one ultracapacitor. The ultracapacitor is disposed within the enclosure and coupled to the battery to provide electrical energy via battery terminals. The enclosure conforms to a standard form factor for a battery that comprises one or more conventional storage cells without an ultracapacitor.

Abstract: An energy-storage device electrode core is disclosed that features relatively low-inductive impedance (and thus low equivalent series resistance (ESR)). Also disclosed is an energy-storage device electrode core that features a radii-modulated electrode core that forms extra vias to facilitate efficient heat removal away from the electrode, thus improving the performance and capabilities of an energy-storage device so equipped. The internal electrode core heat-removal vias are defined by the modulation patterns that in turn define the size and layout of the folds in the electrode, which are circumferentially collapsed about the center axis of the electrode core.

Abstract: A dry process based battery that includes an electrode with one or more recycled structure is disclosed.

Abstract: This disclosure provides systems, methods and apparatus for managing a capacitor system. In one aspect, an energy storage system includes a capacitor system, a charging circuit, and a controller. The capacitor system includes one or more capacitors. The charging circuit is configured to charge the capacitor system to a first target voltage. The controller is configured to detect a first condition and is programmed, in response to the first condition, to instruct the charging circuit to charge the capacitor system to a second target voltage that is less than the first target voltage. The controller is programmed to provide a notification that the capacitor system is operating in a degraded state.

Abstract: A device (1) monitors and/or balances an ultracapacitor (3) and/or a module (4) comprising a plurality of ultracapacitors (3) connected in series, the module (4) being connectable in series or in parallel with other modules (4). The device comprises an electronic board (2) comprising digital control and/or command means, such as a microcontroller (5), executing a program for monitoring and balancing the ultracapacitor (3) and/or the module (4). The relative capacitances of the capacitors are measured, and this information is employed to determine when to carry out a controlled discharge of particular capacitors. Temperature information is also employed to determine when to carry out a controlled discharge of particular capacitors. In this way the lifetime of any particular capacitor is, desirably, extended to be no shorter than the lifetime of other longer- lived capacitors in the module.

Abstract: A method of making an active electrode material is provided. Activated carbon having between about 70 and 98 percent microporous activated carbon particles of a total amount of activated carbon by weight and between about 2 and 30 percent mesoporous activated carbon particles of the total amount of activated carbon by weight is provided. Binder is provided. The activated carbon and the binder is mixed to form an active electrode material mixture. In some implementations, a method of making an electrode film includes forming a film of active electrode material comprising activated carbon having between about 70 and 98 percent microporous activated carbon particles of a total amount of activated carbon by weight and between about 2 and 30 percent mesoporous activated carbon particles of the total amount of activated carbon by weight. The method further includes bonding the film to a current collector to form an electrode film.

Abstract: In an energy storage system that includes a battery and an ultracapacitor, the state of charge (SOC) of the capacitor is the subject of a dynamic set-point. This dynamic set-point control is a function of the load regime to which the storage system is exposed, for example a hybrid automobile or electric automobile. The control may be based in part upon real-time fast Fourier transform analysis of load current, permitting real-time adjustment of control coefficients. In this way, it is possible to minimize the occurrence of the capacitor being fully charged at a time when it would be desired to be able to absorb high current, for example from regenerative braking. Likewise it is possible to minimize the occurrence of the capacitor being nearly discharged at a time when it would be desirable to have boost power available.

Abstract: Particles of active electrode material are made by blending or mixing a mixture of activated carbon, optional conductive carbon, and binder. In selected implementations, the activated carbon particles have between about 70 and 98 percent microporous activated carbon particles and between about 2 and 30 percent mesaporous activated carbon particles by weight. Optionally, a small amount of conductive particles, such as conductive carbon particles may be used. In one implementation, the binder is inert. The electrode material may be attached to a current collector to obtain an electrode for use in various energy storage devices, including a double layer capacitor.