A power storage device comprises: an electrode stack comprising a plurality of bipolar electrodes and a pair of outermost current collectors; an inner voltage detection terminal; a housing; and a pair of outer voltage detection terminals. Each of the plurality of bipolar electrodes has a current collector, a positive electrode active material layer, and a negative electrode active material layer. The inner voltage detection terminal is electrically connected to the current collector. Each of the pair of outer voltage detection terminals is thicker than the inner voltage detection terminal. The housing is located between the pair of outer voltage detection terminals in the stacking direction. A dimension of the housing in the stacking direction is equal to or less than a distance between the pair of outer voltage detection terminals in the stacking direction.

A power storage module includes an electrode laminate including a plurality of bipolar electrodes which are laminated and a sealing body sealing a space between a pair of the bipolar electrodes adjacent to each other in a laminating direction among the plurality of bipolar electrodes in the electrode laminate. Each of the plurality of bipolar electrodes includes an electrode plate. The sealing body includes a group of primary sealing bodies each provided at an edge portion of the electrode plate and a secondary sealing body. The secondary sealing body includes a first resin portion that is provided along a side surface of the electrode laminate extending in the laminating direction and bonds the group of primary sealing bodies, and a second resin portion covering the first resin portion.

A power storage module includes a cylindrical resin portion that extends in a direction in which a plurality of bipolar electrodes is stacked and that accommodates therein the plurality of the bipolar electrodes. The resin portion includes a first seal portion that has a cylindrical shape and is joined to peripheral edge portions of a plurality of electrode plate, and a second seal portion that has a cylindrical shape and is disposed outside the first seal portion in a direction that crosses the stacking direction of the bipolar electrodes. A plurality of separators is disposed such that outer peripheral ends of the separators are located between an outer peripheral end of the first seal portion and an inner peripheral end of the first seal portion.

A battery includes first and second power generating elements laminated to each other. In the first power generating element, the inner layer of a first electrode current collector is in contact with a first electrode active material layer. In the second power generating element, the inner layer of a second electrode current collector is in contact with a second electrode active material layer. The outer layers of the first electrode current collector and the second electrode current collector are in contact with each other. The inner layer of the first electrode current collector contains a first material; the inner layer of the second electrode current collector contains a third material different from the first material; the outer layer of the second electrode current collector contains a second material different from the first material; and the outer layer of the first electrode current collector contains the second material.

Disclosed herein is a stacked/folded type electrode assembly configured to have a structure in which a plurality of unit cells, each of which includes a positive electrode having an electrode mixture including an electrode active material applied to a current collector, a negative electrode having an electrode mixture including an electrode active material applied to a current collector, and a separator disposed between the positive electrode and the negative electrode, is wound in the state of being arranged on a sheet type separation film, wherein the unit cells include one full cell and three or more bi-cells, the outermost unit cells of the electrode assembly are each configured such that an electrode forming the outside of the electrode assembly is configured as a single-sided electrode, in which no electrode mixture is applied to the surface of the current collector facing the outside of the electrode assembly, and the single-sided electrodes are electrodes having the same polarity.

A battery includes a first battery cell including an endplate current collector cathode, an endplate current collector anode, a plurality of battery cell components between the endplate current collector cathode and the endplate current collector anode, each battery cell component including a cathode, a separator, an anode and a bipolar current collector, and at least one sense tab connected to and extending from one of the bipolar current collectors between the endplate current collector cathode and the endplate current collector anode. A second battery cell is connected in parallel to the first battery cell via the endplate current collector cathode and the endplate current collector anode. A voltmeter is connected between a first sense tab and one of the following: the endplate current collector cathode, endplate current collector anode or a second sense tab of the at least one sense tabs, the voltmeter being electrically isolated from at least one of the endplate current collector cathodes and the endplate current collector anodes via at least one battery cell component of the first battery cell and measuring at least two of the battery cell components. A battery cell, a method, an electric vehicle battery and an electric vehicle are also provided.

A bipolar battery including a) one or more stacks of battery plates assembled into electrochemical cells having i) one or more bipolar plates and ii) a first and second monopolar plate; b) a liquid electrolyte disposed between each pair of battery plates, wherein the liquid electrolyte functions with an anode and cathode pair to form an electrochemical cell; c) a separator located between the anode and the cathode of the electrochemical cell; and d) a membrane comprising a polymeric material disposed about an entire periphery of edges of the one or more stacks of battery plates so as to form a seal about the periphery of the edge of the battery plates, and wherein the seal prevents the liquid electrolyte from flowing outside of the one or more stacks of battery plates.

The present invention relates to an energy storage unit (1) having a plurality of electrochemical cells (2), wherein the electrochemical cells (2) each have a first outer face (3) comprising a first electrode (5), and a second outer face (4) comprising a second electrode (6), and the electrochemical cells (2) are electrically interconnected owing to the lined-up arrangement (9) of the electrochemical cells (2) by way of the outer faces (3, 4) by means of the electrodes (5, 6). The energy storage unit (1) additionally comprises a first frame element (7) and a second frame element (8), which frame elements are directly or indirectly connected to one another, wherein the first frame element (7) is arranged at one end (10) of the lined-up arrangement (9) of the electrochemical cells (2), and the second frame element (8) is arranged at the other end (11) of the lined-up arrangement (9) of the electrochemical cells (2). The present invention also relates to a battery cell (2) for use with an energy storage unit (1) according to the invention, and also to a method for producing a battery cell (2) of this kind.

A secondary battery in which an electrode assembly including positive electrodes, negative electrodes, and separators disposed between the positive electrodes and the negative electrodes, and an electrolyte are housed in an exterior body. The electrode assembly has a step structure including a first region having a relatively high cross-sectional height and a second region having a relatively low cross-sectional height adjacent to the first region. The electrode assembly includes at least one of a positive electrode side connecting portion and a negative electrode side connecting portion in the first region. At least one of a positive electrode side extended portion and a negative electrode side extended portion in the second region is configured to be electrically connected to an external terminal.

The electrical performance and structural integrity of lithium battery electrodes, formed of particles of active electrode materials, are improved by mixing electrically conductive wires (metal wires, carbon fibers, and/or the like, including chemically-reduced metal oxide particles) with the particles of active electrode material. For example, copper wires may be intimately mixed with anode particles in porous anode layers which are resin-bonded to sides of a copper current collector foil. And aluminum wires may be mixed with cathode particles in porous cathode layers resin bonded to an aluminum current collector. The wires may be used to increase both the conductivity of electrons and lithium ions and the flexibility of the electrode layer when the electrodes are infiltrated with a solution of a lithium salt electrolyte. The workable thickness of each electrode layer can thus be increased and its performance enhanced to produce a lower cost and better forming battery.