Abstract: The case side wall of the battery case has a tubular portion with a closed cross-section structure consisting of an upper wall, a lower wall, an inner wall, and an outer wall, an inner flange, and an outer flange. A first member made of a steel plate forms an inner flange, an inner wall, an upper wall, an outer wall upper portion, and an outer flange, and a second member made of a steel plate forms an outer flange, an outer wall lower portion, a lower wall, and two reinforcing walls. The reinforcing wall is located in the interior space of the tubular portion at the same height as and below the outer flange. A reinforcing wall is placed at a position facing the shock absorber, increasing the strength of this part, suppressing deformation of the case side wall in a side collision, and suppressing damage to the battery case.

Abstract: The case side wall and the upper cover 24 are sealingly connected at the upper wall. The case side wall and the lower cover are sealingly connected by an inner flange. A first member of one steel plate of the case side wall forms a portion of the upper wall that is sealingly coupled to the upper cover, an inner flange, and an inner wall in one piece seamlessly and without holes. The inner wall serves as a waterproof wall, and even if water enters the tubular portion of the case side wall, it is possible to prevent water from entering into the battery accommodating space of the battery case.

Abstract: A negative electrode for a non-aqueous electrolyte secondary battery includes a negative electrode material mixture including a negative electrode active material capable of electrochemically absorbing and desorbing lithium ions, a carbon nanotube; and an acrylic resin. The negative electrode active material includes a composite material including a silicate phase, and silicon particles dispersed in the silicate phase, and the silicate phase includes at least one selected from the group consisting of alkali metal elements and Group 2 elements.

Abstract: A vehicle underfloor structure includes a battery having at least one connector projecting from a front end of the battery, and a protector covering and protecting the at least one connector from below, the protector having a rear portion attached to the battery and a front portion fastened to an attachment bar by a fastening bolt. The protector includes a fastening hole through which the fastening bolt is inserted, and a cutout connected to a rear portion of the fastening hole and allowing the fastening bolt to separate from the protector.

Abstract: In the coil component, the edge of the aperture of the protection film covering the coil from the lower surface side of the element body does not extend in the same plane. In this case, even if a crack occurs in the joint region between the coil and the bump electrode, the crack is less likely to cross the joint region as compared with the case where the edge extends in the same plane. Therefore, in the coil component, the crack is effectively suppressed.

Abstract: In the coil component, the terminal electrode enters an aperture of the element body and is jointed with the bump electrode inside the element body. That is, the terminal electrode is in contact with both the bump electrode and the element body. Therefore, as compared with the case where the bump electrode is exposed to the lower surface of the element body, a joint surface of the terminal electrode is enlarged, and high adhesion of the terminal electrode is realized.

Abstract: In the coil component, the lower end portion of the bump electrode protruding from the lower surface of the element body includes a flange portion, and the lower surface of the lower end portion is concave-convex. Therefore, compared to the case where the bump electrode is exposed in the form of a flat surface so as to be flat with the lower surface of the element body, the contact areas between the bump electrodes and the terminal electrodes are increased, and high connection reliability between the bump electrodes and the terminal electrodes is realized.

Abstract: A lithium secondary battery including positive and negative electrodes including positive and negative electrode current collectors with elongated sheets, respectively, and a negative electrode external terminal electrically connected to the negative electrode current collector, and a negative electrode connection portion interposed between the negative electrode current collector and the negative electrode external terminal, wherein in the negative electrode, a lithium metal deposits during charging and the lithium metal dissolves during discharging, the positive electrode, the negative electrode, and a separator form an electrode group of a cylindrical wound body, and the negative electrode connection portion includes (i) an end portion along a longitudinal direction of the negative electrode current collector projecting from one end face of the wound body, or (ii) a plurality of negative electrode tab-leads electrically connected to the negative electrode current collector and extending from the one end fa

Abstract: A lithium secondary battery includes a wound type electrode group including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, a core member inserted in a hollow of the electrode group, and a nonaqueous electrolyte having a lithium ion conductivity, wherein in the negative electrode, a lithium metal deposits during charging and the lithium metal dissolves during discharging, and the electrode group has a space that allows the separator to be apart from and oppose at least one of the positive electrode and the negative electrode.

Abstract: A method of charging a secondary battery, the battery including a positive electrode in which a lithium ion is stored during discharging and released during charging, a negative electrode in which a lithium metal deposits during charging and dissolves during discharging, and a non-aqueous electrolyte having a lithium ion conductivity, wherein the method includes a step of charging the secondary battery according to a first charging profile. In the secondary battery, a surface of the negative electrode is covered with a protection layer. In the first charging profile, charging starts from a first charging step in which charging is performed at a constant current with a first electric current density I1, and following the first charging step, a second charging step is performed in which charging is performed at a constant current with a second electric current density I2 that is larger than the first electric current density I1.

Abstract: A nonaqueous electrolyte secondary battery is provided with a bottomed tubular outer can accommodating an electrode body, and a sealing body for sealing an opening portion of the outer can. A crimped portion for crimping and securing the sealing body is formed in the outer can by bending the edge portion of the opening portion inward in the radial direction, and the sealing body includes a rupture disk, a cathode cap including a flange, and a metal height adjusting portion for adjusting the height of the crimped portion.

Abstract: A vehicle underfloor structure includes a battery having at least one connector projecting from a front end of the battery, and a protector covering and protecting the at least one connector from below, the protector having a rear portion attached to the battery and a front portion fastened to an attachment bar by a fastening bolt. The protector includes a fastening hole through which the fastening bolt is inserted, and a cutout connected to a rear portion of the fastening hole and allowing the fastening bolt to separate from the protector.

Abstract: A non-aqueous electrolyte secondary battery includes an electrode group, and a non-aqueous electrolyte. The electrode group includes a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. The negative electrode includes a negative electrode current collector having a belt-like shape and having a first end and a second end in a short-side direction of the negative electrode current collector. The negative electrode current collector includes at least one slit group constituted of a plurality of slits extending in a form of a dashed line along the short-side direction from one end of the first end and the second end toward the other end, and a hole formed on the other end side of the plurality of slits and having a width larger than an average width of the plurality of slits.

Abstract: A method of charging a lithium secondary battery including: a step of charging the lithium secondary battery based on any of a first charging profile and a second charging profile, wherein the first charging profile includes at least two charging steps, the second charging profile includes more charging steps than the first charging profile, at a starting point of the step of charging the secondary battery, the first charging profile is selected when the secondary battery has a depth of discharge of less than a predetermined threshold, and the second charging profile is selected when the secondary battery has a depth of discharge of the threshold or more.

Abstract: A charging and discharging method for a non-aqueous electrolyte secondary battery. The battery includes a positive electrode, a negative electrode including a negative electrode current collector, and a non-aqueous electrolyte, in which a lithium metal deposits on the negative electrode during charge, and the lithium metal dissolves in the non-aqueous electrolyte during discharge. The method includes a charging step, and a discharging step performed after the charging step. The charging step includes a first step of performing a constant-current charging at a first current I1 having a current density of 1.0 mA/cm2 or less, and a second step of performing a constant-current charging at a second current I2 larger that the first current I1, after the first step. In the discharging step, an amount of electricity corresponding to 20% or more and 80% or less of a full charge amount is discharged.

Abstract: A charging method for a non-aqueous electrolyte secondary battery. The battery includes a positive electrode, a negative electrode including a negative electrode current collector, and a non-aqueous electrolyte, in which a lithium metal deposits on the negative electrode during charge, and the lithium metal dissolves in the non-aqueous electrolyte during discharge. The method includes first to third steps. In the first step, a constant-current charging is performed at a first current I1 having a current density of 1.0 mA/cm2 or less. In the second step, a constant-current charging is performed at a second current I2 being larger than the first current I1 and having a current density of 4.0 mA/cm2 or less. In the third step, a constant-current charging is performed at a third current I3 being larger than the second current I2 and having a current density of 4.0 mA/cm2 or more.

Abstract: The cylindrical battery includes: an electrode body in which a positive electrode plate and a negative electrode plate are wound with a separator therebetween: an electrolyte; a bottomed cylindrical outer can that houses the electrode body and the electrolyte; and a sealing body that closes an opening of the outer can, wherein the sealing body includes a nipture plate that is caulked and fixed to the opening of the outer can with a gasket therebetween, and an external terminal that is not caulked and fixed to the opening of the outer can, the rupture plate has a valve part that is ruptured when an internal battery pressure rises, and the external terminal is fixed to an upper surface portion of a valve part.

Abstract: Provided is a cylindrical battery with which it is possible to suppress an increase in weight while increasing capacity. A cylindrical battery includes: an electrode body comprising a positive electrode and a negative electrode, which are wound together via a separator; an electrolyte; a bottomed cylindrical outer can for accommodating the electrode body and the electrolyte; and a sealing body that is fixed to an open end portion of the outer can by swaging and is for sealing the outer can. In regard to the outer can, the outer diameter of a body part for accommodating the electrode body is 20 mm or greater, and the outer diameter of the open end portion for accommodating the sealing body is less than the outer diameter of the body part.

Abstract: A vehicle underfloor structure includes a battery having at least one connector projecting from a front end of the battery, and a protector covering and protecting the at least one connector from below, the protector having a rear portion attached to the battery and a front portion fastened to an attachment bar by a fastening bolt. The protector includes a fastening hole through which the fastening bob is inserted, and a cutout connected to a rear portion of the fastening hole and allowing the fastening bolt to separate from the protector.

Abstract: A negative electrode for a secondary battery including a negative electrode active material capable of absorbing and releasing lithium ions. The negative electrode active material includes a first carbon material as a main component, and includes a second carbon material and a silicon-containing material which are present between particles of the first carbon material. The first carbon material has an average particle diameter A, the second carbon material has an average particle diameter B, and the silicon-containing material has an average particle diameter C, satisfying A>C?B.