An electronic unit includes an electrolytic capacitor, a covering resin layer, and electronic components. The electrolytic capacitor is on an upper surface of an insulating substrate. The covering resin layer covers the upper surface of the insulating substrate and the electronic components. Part of the covering resin layer serves as an electrolytic capacitor covering portion. The electrolytic capacitor covering portion includes an outer peripheral covering portion that covers an outer peripheral surface of the electrolytic capacitor and a top covering portion that covers a top portion of the electrolytic capacitor. A thin wall groove is formed in the top covering portion. The outer peripheral covering portion extends upward beyond the top covering portion by a height h. The top covering portion easily breaks at the thin wall groove so that an explosion-proof valve easily operates. A region corresponding to the height h creates an operating space of the explosion-proof valve.

A vascular cooled capacitor assembly includes a plurality of capacitors having respective first and second leads, first and second busbars disposed in electrical contact with the first and second leads, an encapsulant enveloping the capacitors and a respective major portion of each of the first and second busbars, and a network of channels enveloped within the encapsulant and formed by deflagration of a sacrificial material. The network has at least one network inlet and at least one network outlet, each of which is configured for sealable engagement with a cooling fluid system. A branch of each channel is positioned inside a central axial passage of a capacitor, around an outer periphery of a capacitor, and/or between two capacitors. A housing may enclose the capacitors, the channels and major portions of the first and second busbars.

A vascular cooled capacitor assembly includes a plurality of capacitors having respective first and second leads, first and second busbars disposed in electrical contact with the first and second leads, an encapsulant enveloping the capacitors and a respective major portion of each of the first and second busbars, and a network of channels enveloped within the encapsulant and formed by deflagration of a sacrificial material. The network has at least one network inlet and at least one network outlet, each of which is configured for sealable engagement with a cooling fluid system. A branch of each channel is positioned inside a central axial passage of a capacitor, around an outer periphery of a capacitor, and/or between two capacitors. A housing may enclose the capacitors, the channels and major portions of the first and second busbars.

A capacitor bank which has a plurality of capacitor units, in which each capacitor has a plurality of electrical capacitor elements, and the capacitor units are divided into a plurality of groups of capacitor units. The arrangement has a plurality of group monitoring units, with one of the group monitoring units associated with each group of capacitor units. At least one of the group monitoring units is configured so that it monitors the respective group of capacitor units for a failure of a capacitor element in one of the capacitor units of the group and, when such a failure of a capacitor element is detected, transmits data which describe this failure of the capacitor element to a monitoring receiver.

A method for depassivation of an energy storage device having an anode, a cathode and a core with an electrolyte, the method including: detecting that a first predetermined event related to a buildup of passivation has occurred with regard to the energy storage device; switching between a positive input voltage and a negative input voltage provided to the anode at a frequency sufficient to depassivate the anode; discontinuing the switching when a second predetermined event related to passivation has occurred.

A power storage device includes an electrode assembly, a case, first and second electrode terminals, and a current interrupting mechanism. The current interrupting mechanism interrupts a current through an electrical current-carrying path when the internal pressure of the case reaches a preset pressure. The current interrupting mechanism includes a mechanism insulating portion, which insulates the first electrode terminal including the current interrupting mechanism from an end face of the electrode assembly, and a terminal insulating portion, which insulates the second electrode terminal from the end face of the electrode assembly. The projecting dimension from a wall portion to the mechanism insulating portion including the first electrode terminal is equal to the projecting dimension from the wall portion to the terminal insulating portion including the second electrode terminal.

An electrolytic capacitor module includes a plurality of capacitor elements, an electrode lead, a sealing member, and a heat dissipation member. The electrode lead is electrically connected to each of the plurality of capacitor elements, and penetrates through the sealing member. The heat dissipation member has a plurality of housing portions that respectively house the plurality of capacitor elements. Further, the heat dissipation member has a first surface and a second surface opposite to the first surface. Each of the plurality of housing portions has an insertion opening opened in the first surface. The sealing member seals the insertion opening. The electrode lead is led out from the insertion opening.

An ultracapacitor that is in contact with a hot atmosphere having a temperature of about 80 C. or more is provided. The ultracapacitor contains a first electrode, second electrode, separator, nonaqueous electrolyte, and housing is provided. The first electrode comprises a first current collector electrically coupled to a first carbonaceous coating and the second electrode comprises a second current collector electrically coupled to a second carbonaceous coating. The capacitor exhibits a capacitance value within the hot atmosphere of about 6 Farads per cubic centimeter or more as determined at a frequency of 120 Hz and without an applied voltage.

A power storage device includes: a power storage stack which includes a plurality of power storage cells; a heating member that heats the power storage stack; a cooling member that cools the power storage stack; a first pressing member that presses the heating member against the power storage stack; a second pressing member that presses the cooling member against the power storage stack; and a sheet member covering the bottom of the power storage stack so that an enclosed space is formed between the sheet member and the power storage stack in a cross section of the power storage stack, wherein the sheet member has a first surface and a second surface, the cooling member is disposed on the first surface, within the enclosed space, and the heating member is disposed on the second surface, on an outer side of the enclosed space.

A battery protection circuit has two input nodes and two output nodes. The input nodes are connected to a positive supply line and a negative or ground line respectively, and the two output nodes are connected to a positive side of a load and a negative or ground return side of the load. The circuit includes a solid state switch which is oriented such that when the switch is open current cannot flow from the battery through the load. At least one capacitor is connected in series with a diode between the two input nodes of the circuit to smooth out any negative transient voltages present at the positive input node of the circuit. The capacitor includes a polarized capacitor and the diode is oriented to protect the capacitor during normal use when a positive voltage is present at the input node that is connected to the positive supply line.