US-20260128419-A1 - ENERGY STORAGE DEVICE

US20260128419A1US 20260128419 A1US20260128419 A1US 20260128419A1US-20260128419-A1

Abstract

An energy storage device includes at least one energy storage cell, a bottom wall, a panel member provided below the bottom wall, and a protective member provided on the bottom wall. A safety valve is provided in a lower surface of the energy storage cell. The bottom wall has a through hole provided at a position facing the safety valve. The protective member includes a thermal insulation member provided within the through hole. The thermal insulation member includes a receiving surface located below an upper surface of the bottom wall.

Inventors

Makoto Iwata
Shotaro Ishikawa
Shunsuke Fujiwara
Soichiro Nakamura
Takahiko Nakano
Kosuke Suzuki
Masahiro Ishizuka
Kensuke Matsuo
Kazuya Kumazawa

Assignees

TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date: 20260507
Application Date: 20250829
Priority Date: 20241106

Claims (4)

1 . An energy storage device comprising: at least one energy storage cell; a bottom wall disposed below the at least one energy storage cell; a panel member provided below the bottom wall and defining, together with the bottom wall, an exhaust path; and a protective member provided on the bottom wall, wherein: a safety valve is provided in a lower surface of the at least one energy storage cell; the bottom wall has a through hole provided at a position facing the safety valve; the protective member includes a thermal insulation member provided within the through hole; and the thermal insulation member includes a receiving surface located below an upper surface of the bottom wall.
2 . The energy storage device according to claim 1 , wherein: the protective member further includes a holding sheet that holds the thermal insulation member; and the holding sheet includes an adhesive portion bonded to the receiving surface below the upper surface of the bottom wall.
3 . The energy storage device according to claim 1 , wherein the through hole includes a tapered portion that gradually decreases in diameter from the upper surface of the bottom wall downward, and a holding portion that extends downward from a lower end of the tapered portion and holds the thermal insulation member.
4 . The energy storage device according to claim 1 , further comprising a surrounding member provided between the at least one energy storage cell and the bottom wall and shaped to surround the through hole.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to Japanese Patent Application No. 2024-194424 filed on Nov. 6, 2024. The disclosure of the above-identified application, including the specification, drawings, and claims, is incorporated by reference herein in its entirety. BACKGROUND 1. Technical Field The present disclosure relates to energy storage devices. 2. Description of Related Art For example, Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2024-501935 (JP 2024-501935 A) discloses an electrical device including a plurality of battery cells, a first housing that houses the battery cells, a second housing that houses the first housing, and an isolation member provided within the second housing. The isolation member supports the first housing at a position above the bottom surface of the second housing. The second housing includes a collection cavity under the isolation member. A third fragile area is provided on the lower surface of each battery cell, and a pressure relief area is provided on the bottom surface of the first housing, and a second fragile area is provided on the isolation member. A material discharged from any of the battery cells through the third fragile area of the battery cell flows through the pressure relief area and the second fragile area into the collection cavity formed under the isolation member. SUMMARY In the electrical device described in JP 2024-501935 A, it takes time for the material discharged from the battery cell through the third fragile area to crack open the pressure relief area and the second fragile area. Therefore, there is a concern that part of the contents (so-called debris) of the battery cell contained in the discharged material may scatter into the space between the battery cell and the first housing without passing through the pressure relief area and the second fragile area. An object of the present disclosure is to provide an energy storage device that can reduce scattering of the contents of an energy storage cell contained in a material discharged from the electricity storage cell. An energy storage device according to one aspect of the present disclosure includes: at least one storage cell; a bottom wall disposed below the at least one energy storage cell; a panel member provided below the bottom wall and defining, together with the bottom wall, an exhaust path; and a protective member provided on the bottom wall. A safety valve is provided in a lower surface of the at least one energy storage cell. The bottom wall has a through hole provided at a position facing the safety valve. The protective member includes a thermal insulation member provided within the through hole. The thermal insulation member includes a receiving surface located below an upper surface of the bottom wall. The present disclosure can provide an energy storage device that can reduce scattering of the contents of an energy storage cell contained in a material discharged from the electricity storage cell. BRIEF DESCRIPTION OF THE DRAWINGS Features, advantages, and technical and industrial significance of exemplary embodiments of the disclosure will be described below with reference to the accompanying drawings, in which like signs denote like elements, and wherein: FIG. 1 is a perspective view schematically showing an energy storage device according to an embodiment of the present disclosure; FIG. 2 is a plan view schematically showing the energy storage device with an upper cover removed; FIG. 3 is a sectional view taken along line III-III in FIG. 2; FIG. 4 is a sectional view schematically showing a modification of a protective member; FIG. 5 is a sectional view schematically showing a modification of a bottom wall and the protective member; FIG. 6 is a sectional view schematically showing a modification of the bottom wall and the protective member; and FIG. 7 is a sectional view schematically showing a modification of the protective member. DETAILED DESCRIPTION OF EMBODIMENTS An embodiment of the present disclosure will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same signs. FIG. 1 is a schematic perspective view of an energy storage device according to an embodiment of the present disclosure. FIG. 2 is a plan view schematically showing the energy storage device with an upper cover removed. FIG. 3 is a sectional view taken along line III-III in FIG. 2. An energy storage device 10 in the present embodiment is mounted in, for example, a lower part of a vehicle. The vehicle is, for example, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a battery electric vehicle. As shown in FIGS. 1 to 3, the energy storage device 10 includes six energy storage stacks 11 to 16, a housing 200, a protective member 280, a surrounding member 290, devices 300, a device cooler 350, and a cooling medium pipe 400. The number of energy