Kabushiki Kaisha Toyota Jidoshokki

Masato Ogasawara

Atsushi Minagata

Takayuki Hirose

Mikiya Kurita

Yusuke Yamashita

Motoaki Okuda

Shinji Suzuki

Ryuji Oide

Yasuaki Takenaka

Tomohiro Nakamura

Hirokuni Akiyama

Yohei Hamaguchi

Yasuyuki Goda

Tomoaki Tachibana

A secondary battery is provided with first and second electrode assembly bodies and first and second negative electrode tab groups. The first and second negative electrode tab groups respectively have collected foil portions each constituted by a plurality of collected tab portions and extension portions. The extension portions of the respective tab groups have portions-to-be-welded and step portions. In the step portions, the plurality of tabs are laminated in a state that the end portions thereof are shifted in a step-like manner. The secondary battery is provided with an overlapped portion where the step portions of the first negative electrode tab group and the second negative electrode tab group are overlapped with each other in the lamination direction of the negative electrode tabs.

Power storage device

A power storage apparatus has a case accommodating an electrode assembly, and a release valve present in the wall of the case. The electrode assembly includes electrodes. A shielding member is arranged between the inner surface of the wall and the end surface of the electrode assembly. A point located in a center of the case in a front view of the case taken in the stacking direction of the electrodes and located in a center of a dimension of the electrode assembly in the stacking direction is a center point, and a region surrounded by a plane connecting the center point and a contour of the pressure release valve at a shortest distance is a three-dimensional region. The shielding member includes a shielding portion that entirely covers a cross section of the three-dimensional region along the end face of the electrode assembly.

Power storage apparatus

The electric storage device includes an electrode assembly having a positive electrode and a negative electrode, a case for housing the electrode assembly, a pressure relief valve, and positive and negative electrode conductive members that are electrically connected to the respective corresponding electrodes. The case has a wall in which the pressure relief valve is disposed. At least one of the positive and negative electrode conductive members includes an interposing portion located between the inner surface of the wall and an end face of the electrode assembly facing the inner surface, and a shielding portion located closer to the end face of the electrode assembly than the interposing portion. The shielding portion covers the pressure release valve from a side of the wall where the electrode assembly is located.

Electric storage device

An electricity storage apparatusmay include: an electrode assemblyincluding a positive electrode and a negative electrode; a tabincluding one end which is electrically connected to the electrode assembly; and a conductive memberdisposed above the electrode assembly, and electrically connected to the tab. The tabmay include a first bent partprovided in a vicinity of the one end of the tab, a second bent partprovided in a vicinity of another end of the tab, and a joining partprovided between the first bent partand the second bent partand joined to the conductive member. The second bent partmay be bent so that the other end of the tabis disposed above the conductive member

Electricity storage apparatus

A power storage apparatus includes bag-shaped separators. Each of the bag-shaped separators includes a first welded portion and a first non-welded portion. The first welded portion exists along a first edge of the bag-shaped separator and is formed by welding the surplus sections of the separator members together. In the first non-welded portion, the separator members are not welded together. The bag-shaped separator includes a second welded portion and a second non-welded portion. The second welded portion exists along a second edge and is formed by welding the surplus sections of the separator members together. The second non-welded portion is located closer to the second edge than the second welded portion. In the second non-welded portion, the separator members are not welded together. In the power storage apparatus, the width of the first non-welded portion&#x3e;the width of the second non-welded portion.

A positive electrode plate includes a front positive electrode active material layer on a front surface of a positive electrode metal foil, and having a positive electrode large tapered portion that extends at an incline from one edge of the front surface of the positive electrode metal foil at a positive electrode large inclination angle. A negative electrode plate includes a front negative electrode active material layer on a front surface of a negative electrode metal foil, and having a negative electrode large tapered portion that extends at an incline from one edge of the front surface of the negative electrode metal foil at a negative electrode large inclination angle. The positive and negative electrode plates are alternately laminated with a separator interposed therebetween such that each of their front surfaces is oriented in the same direction in the rear-to-front directional axis along the thickness of the plates.

Growing community of inventors

Kariya, Japan

Masato Ogasawara