A battery system includes a traction battery, a traction battery controller, and a backup controller. The traction battery powers a high-voltage domain. The traction battery controller may be powered by a low-voltage domain that is separated from the high-voltage domain. The traction battery may be configured to disable cell balancing of the traction battery after expiration of a main timer. The backup controller may be powered by and within the high-voltage domain. The backup controller implements a backup timer, that includes a non-processor logic circuit, and is configured to disable cell balancing after expiration of the backup timer.

An electric power storage device includes at least one electric power storage cell having a first end provided with a first electrode, and a second end provided with a second electrode; a first electrode bus bar that is disposed on a side of the first end and is connected to the first electrode; and a second electrode bus bar that is disposed on a side of the second end and is connected to the second electrode. The first electrode bus bar is provided with a connection line connected to the first electrode. The first electrode bus bar and the second electrode bus bar are joined to each other by ultrasonic joining. A joint portion between the first electrode bus bar and the second electrode bus bar is disposed at a position that is closer to the second end than to the first end.

Disclosed is a battery module comprising a cell assembly including a plurality of secondary batteries stacked in at least one direction, and a bus bar assembly including a plurality of bus bars configured to electrically connect the plurality of secondary batteries and having at least one perforation hole into which the electrode leads are inserted, and a bus bar frame configured so that the plurality of bus bars are mounted to an outer side surface thereof, wherein the bus bar frame includes: a bus bar fixing portion having an insert space elongated in the right and left direction, the bus bar fixing portion fixing a top end and a bottom end of the bus bar, and a bus bar open portion opened so that the perforation hole of the bus bar is exposed inwards as the position of the bus bar in the right and left direction is changed.

A battery cell array includes a plurality of battery banks, each battery bank including a two-dimensional m-by-n or higher-order matrix of battery cells; a row address decoder configured to activate selected address lines, the address lines including a wordline(s); a column address decoder configured to activate selected address lines, the address lines including a bitline(s); an address decoder(s), if required, configured to activate a select signal(s) to select an additional address line(s) for a more than two-dimensional matrix of battery cells; a controller configured to directly or indirectly activate a bank select signal(s) to select a battery bank of the plurality of battery banks.

A battery pack is provided which includes a battery, a circuit board equipped with load feed lines, bus bars connecting with the battery and the circuit board, first and second switches, and third to sixth switches. The first and second switches are disposed in a housing which is higher in capacity of heat dissipation than the circuit board. The third to sixth switches are disposed on the circuit board. The first and second switches are larger in amount of electrical current flowing therethrough than the third to sixth switches on time average. This enables the size of the battery pack to be reduced without sacrificing the dissipation of heat from the switches.

Disclosed is a cooling jacket configured to be disposed close to one surface of a battery cell to absorb heat of the battery cell, the cooling jacket including a cooling plate and a plurality of cooling channels extending therein. The plurality of cooling channels include a coolant supply manifold channel and a coolant discharge manifold channel respectively disposed at first and second sides of the cooling plate and each extending in a longitudinal direction from an inside of the cooling plate to an outside of the cooling plate so that one end thereof is exposed to the outside of the cooling plate; and non-uniform cooling channels spaced apart from each other by a predetermined distance and each having first and second ends respectively connected to the coolant supply manifold channel and the coolant discharge manifold channel, the non-uniform cooling channels having widths that are non-uniform in the longitudinal direction.

An electrolyte for a lithium metal battery including a nonaqueous aprotic organic solvent and a lithium salt dissolved or ionized in the nonaqueous aprotic organic solvent. The nonaqueous aprotic organic solvent includes a cyclic carbonate, an acyclic carbonate, and an acyclic fluorinated ether. The lithium salt includes an aliphatic fluorinated disulfonimide lithium salt.

A power storage device includes: a power storage module in which an electrolytic solution is accommodated, the power storage module including a top face, a bottom face, and a plurality of side faces provided such that the side faces connect the top face to the bottom face; a liquid discharge valve provided on at least one of the side faces; a liquid collection unit configured to collect the electrolytic solution discharged from the liquid discharge valve; an accumulation portion in which the electrolytic solution collected by the liquid collection unit is accumulated; a corrosion portion configured to corrode due to the electrolytic solution; and a detection portion configured to detect breakage of the corrosion portion. The corrosion portion is placed in a passage route along which the electrolytic solution collected by the liquid collection unit reaches the accumulation portion.

A porous electrode and methods of making the same are described. The porous electrode is comprised of a porous conductive layer and an insulating layer, where the pores inside the conductive layer function as mini-containers for the active metals for rechargeable batteries, and the insulating layer covers the top surface of the conductive layer and blocks the sites where active metal dendrites would otherwise preferentially grow. An example of such electrodes is a porous copper foil with top surface coated with polyvinylene difluoride. Electrochemical cells containing the invented electrodes, such as rechargeable lithium battery, sodium battery and aluminum battery, have good cycle life and safety performance.

A porous electrode and methods of making the same are described. The porous electrode is comprised of a porous conductive layer and an insulating layer, where the pores inside the conductive layer function as mini-containers for the active metals for rechargeable batteries, and the insulating layer covers the top surface of the conductive layer and blocks the sites where active metal dendrites would otherwise preferentially grow. An example of such electrodes is a porous copper foil with top surface coated with polyvinylene difluoride. Electrochemical cells containing the invented electrodes, such as rechargeable lithium battery, sodium battery and aluminum battery, have good cycle life and safety performance.