Abstract: A battery includes a charge/discharge body having an electrode (a positive electrode and a negative electrode) with an electrode tab (a positive electrode tab and a negative electrode tab) and a current collector (a positive electrode current collection plate and a negative electrode current collection plate) joined to the electrode tab (the positive electrode tab and the negative electrode tab). The current collector (the positive electrode current collection plate and the negative electrode current collection plate) includes a convex joining section (a positive electrode joining section and a negative electrode joining section). The electrode tab (the positive electrode tab and the negative electrode tab) and the joining section (the positive electrode joining section and the negative electrode joining section) are welded.

Abstract: Provided is a positive electrode for a lithium ion secondary battery that suppresses both a decrease in discharge capacity and an increase in internal resistance due to charging and discharging. The positive electrode for the lithium ion secondary battery includes a positive-electrode current collector and a layered structure provided on the positive-electrode current collector, in which the outermost layer of the layered structure contains a first positive-electrode active material represented by Li1+XMAO2 wherein X satisfies ?0.15?X?0.15, MA represents an element group including Ni, Co, and Mn, and the innermost layer of the layered structure contains a second positive-electrode active material represented by Li1+YMBO2 wherein Y satisfies ?0.15?Y?0.15, and MB represents an element group including Ni, Co, and at least one of Mn or Al.

Abstract: A battery is provided which includes a current collection member and an electrode collector which are sufficiently bonded to each other. A battery 1 includes a charge/discharge body 10 which includes, for example, a positive electrode 11 provided with a collector (for example, a positive electrode current collection foil 11S) and an active material, and a current collection member (for example, a positive electrode current collection plate 21) bonded to the positive electrode current collection foil 11S. The positive electrode current collection plate 21 includes a first stiff portion 21p having predetermined stiffness, and a second stiff portion 21q adjacent to the first stiff portion 21p and higher in stiffness than the first stiff portion 21p. The second stiff portion 21q included in the positive electrode current collection plate 21 and the positive electrode current collection foil 11S of the positive electrode 11 are bonded to each other.

Abstract: An ultrasonic horn reduces the likelihood of damaging a plurality of stacked sheets of metal foil when the stacked sheets and a metal member are ultrasonically bonded by applying ultrasonic vibration to the stacked sheets. An ultrasonic horn is used for ultrasonically bonding a plurality of stacked sheets of negative electrode foil and a negative electrode collector plate by applying ultrasonic vibration to the stacked sheets of negative electrode foil. The horn includes a horn body, a first protrusion having a first surface that is a curved surface and protruding from an opposing surface of the horn body facing the anvil toward the anvil, and a second protrusion provided at a center of the first surface of the first protrusion and protruding toward the anvil. The second protrusion includes an end surface that is a planar surface and a second surface connecting the end surface and the first surface.

Abstract: A solid electrolyte battery comprises a positive electrode layer, a negative electrode layer and a solid electrolyte layer formed between the positive electrode layer and the negative electrode layer, and which is characterized in that: the negative electrode layer comprises a first negative electrode layer, and a second negative electrode layer that is superposed on the first negative electrode layer so as to be in contact with the solid electrolyte layer; the active material of the first negative electrode layer is a crystalline carbon; the active material of the second negative electrode layer is an amorphous carbon; a negative electrode layer solid electrolyte is mixed into the first negative electrode layer and the second negative electrode layer; and (average particle size (D50) of negative electrode layer solid electrolyte 32)<(average particle size (D50) of crystalline carbon 2)<(average particle size (D50) of amorphous carbon 1) is satisfied.

Abstract: A power supply control device is applied to a vehicle equipped with electrical equipment, a relay connected to the electrical equipment, a first power supply that makes the relay operable, and a second power supply that discharges electricity to the electrical equipment via the relay. The device includes: a DC/DC converter that supplies electric power from the second power supply to the relay, serving as a backup for the first power supply; a third power supply charged by the first power supply, outputting the charged electric power to the relay; and a control unit that controls the DC/DC converter and second power supply. The control unit turns off the DC/DC converter when the third power supply's voltage is equal to or larger than a first threshold value and turns on the DC/DC converter when the third power supply's voltage is equal to or smaller than a second, lower threshold value.

Abstract: Provided is a battery module capable of improving the safety as compared with the conventional one. The battery module includes a plurality of battery cells, and busbars 10 connecting to external terminals of the battery cells. The busbars 10 include a busbar, the busbar has a pair of terminal portions 11 and 12, a current-carrying portion 13 connecting the pair of terminal portions 11 and 12, and a fuse 14 placed at the current-carrying portion 13. The current-carrying portion 13 surrounds the fuse 14.

Abstract: An object of the present disclosure is to provide a battery module including a plurality of battery groups each having a plurality of battery cells connected in parallel, the plurality of battery groups being connected in series by bus bars, for which a clad material is not used and thus dissimilar metal welding can be avoided. To achieve the object, a first bus bar 20P mainly contains aluminum and is connected to positive electrode terminals of a plurality of battery cells 1 of each battery group 10 via welding joint portions W1. A second bus bar 20N mainly contains copper and is connected to negative electrode terminals of the plurality of battery cells 1 of each battery group 10 via welding joint portions W2. The first bus bar 20P of one of the mutually adjacent battery groups 10 of the plurality of battery groups 10 is connected to the second bus bar 20N of the other battery group 10 via a mechanical joint portion M.

Abstract: A battery pack includes: a plurality of stacked batteries; a support member (an intermediate block) that is adjacent to the batteries along a width direction Y intersecting a stacking direction X of the batteries and supports the batteries; a control member (a control board) that is provided on one end side (a controller unit side) in the width direction Y and controls the plurality of batteries; and a communication line (an electric wire) that is conducted to the control board and extends from the controller unit side toward another end side (a junction unit side) facing the controller unit side along the width direction Y. The intermediate block has an electrical or magnetic shielding property. The electric wire faces the intermediate block in a region from the controller unit side to the junction unit side.

Abstract: An ultrasonic horn reduces the likelihood of damaging a plurality of stacked sheets of metal foil when the stacked sheets and a metal member are ultrasonically bonded by applying ultrasonic vibration to the stacked sheets. An ultrasonic horn is used for ultrasonically bonding a plurality of stacked sheets of negative electrode foil and a negative electrode collector plate by applying ultrasonic vibration to the stacked sheets of negative electrode foil. The horn includes a horn body, a first protrusion having a first surface that is a curved surface and protruding from an opposing surface of the horn body facing the anvil toward the anvil, and a second protrusion provided at a center of the first surface of the first protrusion and protruding toward the anvil. The second protrusion includes an end surface that is a planar surface and a second surface connecting the end surface and the first surface.

Abstract: A battery pack include: batteries; a bus bar (a negative-electrode-side connection terminal) that electrically connects the batteries and a terminal of an external device (the terminal attached to a power cable); and a holding member (a case) which holds the negative-electrode-side connection terminal and to which the terminal of the power cable is attached with the negative-electrode-side connection terminal interposed therebetween. The negative-electrode-side connection terminal extends in an elongated shape toward a side of the case (holding member) having an insulating property. The negative-electrode-side connection terminal includes a protrusion projecting toward the side of the case. The protrusion extends in the lateral direction of the negative-electrode-side connection terminal on a distal end side in the longitudinal direction of the negative-electrode-side connection terminal.

Abstract: A battery pack includes a battery, a control member (a control board) that controls the battery, a communication line (an electric wire) conducted to the control board, a covering member that covers the electric wire, and a fastening member that fastens the electric wire with the covering member interposed therebetween. The covering member includes a portion to be fastened surrounded and fastened by the fastening member, and a covering portion (a first covering portion) exposed from the fastening member. The first covering portion has a portion located on a side closer to the control board than the fastening member and having an outer diameter (D1>D2) larger than that of the portion to be fastened before being fastened by the fastening member.

Abstract: A battery pack includes: a plurality of stacked batteries; a holding member (a first end block and a second end block) which extends in an intersecting direction (a width direction Y) intersecting a stacking direction X of the plurality of batteries at an end portion along the stacking direction X and holds the plurality of batteries; a control unit (a controller unit) which controls the plurality of batteries; an input/output unit (a junction unit) which is provided along the stacking direction X and to and from which power of the plurality of batteries is input and output via the controller unit; and a fastening member (a fastening bolt) which directly fastens the first end block and the second end block and a housing (a case) of the junction unit.

Abstract: An object is to determine available input/output power of a battery with high accuracy. A battery control device includes: a correction factor calculation unit that determines a correction factor based on a deviation between a state of a secondary battery determined from a measured value related to the secondary battery and a state of the secondary battery calculated using a model related to the secondary battery; and a power limit value calculation unit that employs correction based on the correction factor to calculate a value related to available input/output power of the secondary battery. A ratio between voltage change in internal resistance based on an actual measured voltage obtained by measuring voltage of the secondary battery, and a voltage change in internal resistance based on a model voltage determined using a voltage equivalent circuit model of the secondary battery can be determined as the correction factor.

Abstract: An appropriate upper limit voltage is set to enable maximum charging performance of a secondary battery to be exhibited while effectively suppressing degradation of the secondary battery. An assembled battery control unit determines an upper limit voltage during charge of the secondary battery and calculates chargeable power of the secondary battery based on the upper limit voltage. The assembled battery control unit has an upper limit voltage calculating unit which calculates a voltage history of the secondary battery based on time series data of a voltage of the secondary battery and which calculates the upper limit voltage based on the voltage history.

Abstract: Provided is a battery pack capable of accumulating gas released from a battery cell in the battery pack as much as possible while suppressing the other battery cells from becoming hot due to the gas. The battery pack 100 includes a battery module 30, an electrical unit 50, and a housing 70. The housing 70 internally has a first storage space 70a that stores the battery module 30 and a second storage space 70b that stores the electrical unit 50. A part of the housing 70 defining the second storage space 70b includes a duct 80 that communicates the second storage space 70b with an outside of the housing 70. The duct 80 includes a filter 91 that closes a gas flow path 80a of the duct 80. In response to a gas pressure in the second storage space 70b reaching a predetermined value or more relative to an atmospheric pressure outside the housing 70, the filter 91 opens the flow path 80a of the duct 80.

Abstract: A battery pack 1 includes: a plurality of stacked batteries 100; a spacer (a cell spacer 202, a first intermediate spacer 203, and a second intermediate spacer 204) which is provided between the batteries 100 adjacent to each other along the stacking direction X of the battery 100 and holds the adjacent batteries 100; and a holding member (a first side plate 231 and a second side plate 232) which holds the plurality of batteries 100 along the stacking direction X. For example, the cell spacer 202 includes a convex portion 202a projecting from the battery 100 toward, for example, the second side plate 232. For example, the second side plate 232 includes an accommodating portion 232d having a recessed depression to accommodate the convex portion 202a.

Abstract: A current collection foil (for example, a positive electrode current collection layer) of an electrode includes a current collection section joined with an active material and wound and a plurality of terminal sections provided at a side edge extending in a winding direction of the current collection section. The terminal sections adjacent to one another in the winding direction include the terminal sections formed with relatively longer intervals on a side close to another end portion at a winding end than a side close to one end portion at a winding start of the current collection section. The plurality of terminal sections overlap in a state in which the current collection section is wound. At least one of the terminal sections and the current collection section 11a includes a mark for distinguishing any one terminal section of the current collection section and the other terminal sections.

Abstract: A battery includes a charge/discharge body including an electrode including an electrode tab, a cover that faces a side section of the charge/discharge body, from which the electrode tab projects, and covers and insulates the charge/discharge body, and a container that houses the charge/discharge body covered by the cover and has conductivity. The cover includes a main body section that covers the side section of the charge/discharge body, an insertion section formed in a cutout shape including an opening at an outer edge of the main body section, the electrode tab being inserted into the insertion section, and a wall section that extends in a direction further away from the side section than the main body section and separates an inner surface of the container and the insertion section.

Abstract: An apparatus coupled to an assembled battery with a plurality of serially-connected cells and for setting any one of the plurality of cells as a target cell and estimating a state of charge of the target cell includes: a cell voltage acquisition unit that acquires a measurement result of a closed circuit voltage of the target cell; a reference cell information acquisition unit that sets a reference cell with respect to the plurality of cells and acquires a closed circuit voltage and an open circuit voltage of the reference cell and a reference SOC value representing a state of charge of the reference cell; a temporary SOC operation unit that finds a temporary SOC value representing a temporary state of charge of the target cell on the basis of the closed circuit voltage of the target cell and the closed circuit voltage and the open circuit voltage of the reference cell; and an SOC operation unit that finds an SOC value representing the state of charge of the target cell by using a result of smoothing processi