公开(公告)号：US11145943B2

公开(公告)日：2021-10-12

申请号：US16267764

申请日：2019-02-05

Applicant: SANYO Electric Co., Ltd.

Inventor： Yu Matsui ,  Takashi Hosokawa ,  Kyohei Kobayashi ,  Naotake Yoshida

IPC: H01M2/34 ,  H01M2/12 ,  H01M2/20 ,  H01M50/578 ,  H01M50/317 ,  H01M50/502

Abstract: A battery pack includes a battery unit including rectangular secondary batteries, each including a sealing plate and positive and negative electrode terminals attached to the sealing plate; a bus bar that connects the rectangular secondary batteries together in parallel; an insulating plate disposed between the sealing plates of the rectangular secondary batteries and the bus bar; and a short-circuit breaking portion that interrupts an electric conduction path between the rectangular secondary batteries connected in parallel by allowing each sealing plate to bulge outward in response to an internal pressure rise of the battery to push up the insulating plate and the bus bar. A portion of each sealing plate that bulges most protrudes outward by greater than or equal to 1.5 mm from an outer peripheral edge of the sealing plate when a pressure in the corresponding rectangular secondary battery reaches the operating pressure of a gas release valve.

公开(公告)号：US12080855B2

公开(公告)日：2024-09-03

申请号：US17286683

申请日：2019-11-25

Applicant: SANYO Electric Co., Ltd.

Inventor： Takafumi Hosokawa ,  Takashi Hosokawa ,  Kyohei Kobayashi ,  Shuji Ogawa

IPC: H01M10/0587 ,  H01M10/0525 ,  H01M50/46 ,  H01M50/463 ,  H01M50/489 ,  H01M50/409

CPC classification number: H01M10/0587 ,  H01M10/0525 ,  H01M50/46 ,  H01M50/463 ,  H01M50/489 ,  H01M50/409

Abstract: A decrease in energy density of a battery is suppressed, and the occurrence of internal short circuit between a positive plate and a negative plate located at the innermost circumference of a curved portion of a flat electrode assembly, where the curvature of the curved portion is greatest, is suppressed. In a nonaqueous electrolyte secondary battery including a flat wound electrode assembly (14), the electrode assembly (14) has a pair of curved portions (20A, 20B) located at either end and a flat portion (21) located between the pair of curved portions. In at least one of the curved portions, at least two layers of a second electrode plate are disposed on an inner side of a curved portion of a first electrode plate located at an innermost circumference.

公开(公告)号：US20210351441A1

公开(公告)日：2021-11-11

申请号：US17286683

申请日：2019-11-25

Applicant: SANYO Electric Co., Ltd.

Inventor： Takafumi Hosokawa ,  Takashi Hosokawa ,  Kyohei Kobayashi ,  Shuji Ogawa

IPC: H01M10/0587 ,  H01M50/463 ,  H01M50/46 ,  H01M10/0525

Abstract: A decrease in energy density of a battery is suppressed, and the occurrence of internal short circuit between a positive plate and a negative plate located at the innermost circumference of a curved portion of a flat electrode assembly, where the curvature of the curved portion is greatest, is suppressed. In a nonaqueous electrolyte secondary battery including a flat wound electrode assembly (14), the electrode assembly (14) has a pair of curved portions (20A, 20B) located at either end and a flat portion (21) located between the pair of curved portions. In at least one of the curved portions, at least two layers of a second electrode plate are disposed on an inner side of a curved portion of a first electrode plate located at an innermost circumference.

公开(公告)号：US20190305287A1

公开(公告)日：2019-10-03

申请号：US16267764

申请日：2019-02-05

Applicant: SANYO Electric Co., Ltd.

Inventor： Yu Matsui ,  Takashi Hosokawa ,  Kyohei Kobayashi ,  Naotake Yoshida

IPC: H01M2/34 ,  H01M2/12 ,  H01M2/20

Abstract: A battery pack includes a battery unit including rectangular secondary batteries, each including a sealing plate and positive and negative electrode terminals attached to the sealing plate; a bus bar that connects the rectangular secondary batteries together in parallel; an insulating plate disposed between the sealing plates of the rectangular secondary batteries and the bus bar; and a short-circuit breaking portion that interrupts an electric conduction path between the rectangular secondary batteries connected in parallel by allowing each sealing plate to bulge outward in response to an internal pressure rise of the battery to push up the insulating plate and the bus bar. A portion of each sealing plate that bulges most protrudes outward by greater than or equal to 1.5 mm from an outer peripheral edge of the sealing plate when a pressure in the corresponding rectangular secondary battery reaches the operating pressure of a gas release valve.

公开(公告)号：US20180272456A1

公开(公告)日：2018-09-27

申请号：US15921113

申请日：2018-03-14

Applicant: Sanyo Electric Co., Ltd.

Inventor： Kyohei Kobayashi ,  Takashi Hosokawa ,  Hidekazu Tamai

IPC: B23K11/00 ,  H01M10/04

CPC classification number: B23K11/002 ,  B23K2101/38 ,  H01M2/263 ,  H01M4/661 ,  H01M10/0413 ,  H01M10/0431 ,  H01M2220/20

Abstract: A negative electrode current collector is placed on outer sides of two outermost surfaces of a layered negative electrode core-exposed portion, and a negative electrode conductive member is placed between first and second layered negative electrode core-exposed portions formed by dividing the layered negative electrode core-exposed portion into two parts. A resistance-welding electrode is brought into contact with the negative electrode current collector from the side opposite to the layered negative electrode core-exposed portion side, and the negative electrode current collector, the layered negative electrode core-exposed portion, and the negative electrode conductive member are resistance-welded together. In a placing step, the negative electrode conductive member is placed such that the protrusions thereof are in contact with the first and second layered negative electrode core-exposed portions located between the negative electrode conductive member and the negative electrode current collector, and the protrusions are then melted.