DE-102025141662-A1 - ENERGY STORAGE DEVICE

Abstract

An energy storage device comprises the following: at least one energy storage cell; a cooling plate; a lower housing with a bottom wall; a plate element that, together with the bottom wall, forms a smoke extraction path; and a refrigerant line through which a refrigerant to be supplied to the cooling plate flows. A safety valve is provided in the underside of each energy storage cell. The lower housing includes a contact area that is in contact with the smoke extraction path. The refrigerant line is in thermal contact with the contact area.

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

20260513

Application Date

20251013

Priority Date

20241113

Claims (4)

1. Energy storage device comprising: at least one energy storage cell; a cooling plate that cools the at least one energy storage cell; a lower housing with a bottom wall arranged below the at least one energy storage cell and the cooling plate; a plate element provided below the bottom wall, which together with the bottom wall defines a smoke extraction path; and a refrigerant line through which a refrigerant to be supplied to the cooling plate flows, wherein: a safety valve is provided in a bottom of the at least one energy storage cell; the lower housing comprises a contact section that is in contact with the smoke extraction path; and the refrigerant line is in thermal contact with the contact section.
2. Energy storage device according to Claim 1 , wherein the lower housing further comprises: a perimeter wall connected to the bottom wall and surrounding at least one energy storage cell and the cooling plate, and a corner wall in contact with both a top of the bottom wall and an inside of the perimeter wall and having an interior space; the corner wall comprising the contact section; and the bottom wall being provided with a connecting opening connecting the smoke vent and the interior space.
3. Energy storage device according to Claim 2 , which further comprises a buffer element provided between the refrigerant line and the contact section, wherein the buffer element consists of a thermally conductive material.
4. Energy storage device according to Claim 1 , wherein: the lower housing further comprises a circumferential wall which is connected to the bottom wall and which surrounds at least one energy storage cell and the cooling plate; the circumferential wall has an interior space; and the circumferential wall is provided with a connecting opening which connects the smoke extraction path and the interior space.

Description

BACKGROUND OF THE INVENTION 1. Field of the invention The present disclosure relates to an energy storage device. 2. Explanation of the state of the art The Japanese unpublished patent application No. 2023-126584 ( JP 2023-126 584 A For example, [reference] discloses a battery comprising a plurality of cells, a housing that accommodates the cells, a protective element that protects a lower part of the housing, and a cover. Each cell includes a box that accommodates an electrode assembly. A relief mechanism is provided in a bottom surface of the box. Exhaust gases exiting the relief mechanism flow into a collecting cavity formed between the lower part of the housing and the protective element. BRIEF EXPLANATION OF THE INVENTION In the JP 2023-126 584 A In the battery described, gas flowing into the collection cavity can be released into the atmosphere through an explosion-proof valve or similar device. In this case, there is a concern that a high-temperature gas could be released into the atmosphere. The purpose of the present disclosure is to provide an energy storage device capable of lowering the temperature of a gas released into the atmosphere. One aspect of the present disclosure provides for an energy storage device comprising: at least one energy storage cell; a cooling plate that cools the at least one energy storage cell; a lower housing with a bottom wall arranged below the at least one energy storage cell and the cooling plate; a plate element provided below the bottom wall which, together with the bottom wall, forms a smoke extraction path; and a refrigerant line through which a refrigerant to be supplied to the cooling plate flows, wherein: a safety valve is provided in a bottom of the at least one energy storage cell; the lower housing has a contact section which is in contact with the smoke extraction path; and the refrigerant line is in thermal contact with the contact section. According to the present disclosure, it is possible to provide an energy storage device capable of lowering the temperature of a gas released into the atmosphere. BRIEF EXPLANATION OF THE FIGURES Features, advantages and the technical and industrial significance of exemplary embodiments of the invention are described below with reference to the accompanying figures, in which the same symbols denote the same elements, wherein: 1 a perspective view that schematically illustrates an energy storage device according to an embodiment of the present disclosure; 2 a top view that schematically illustrates a state in which a top cover has been removed from the energy storage device; 3 a sectional view along line III-III in 2 is; 4 a sectional view along line IV-IV in 2 is; 5 a sectional view that schematically represents a modification of a lower housing; and 6 It is a sectional view that schematically represents a modification of the lower housing. DETAILED EXPLANATION OF THE EXECUTIONAL FORMS One embodiment of the present disclosure is described with reference to the figures. In the figures below, identical or corresponding elements are designated with the same reference numerals. 1 is a perspective view that schematically represents an energy storage device according to an embodiment of the present disclosure. 2 is a top view that schematically shows a state in which a top cover has been removed from the energy storage device. 3 is a sectional view along line III-III in 2 . 4 is a sectional view along line IV-IV in 2 . An energy storage device 10 according to the present embodiment is, for example, installed in a lower part of a vehicle. The vehicle is, for example, a hybrid electric vehicle. vehicle, a plug-in hybrid electric vehicle or a battery electric vehicle. As in the 1 to 4 As shown, the energy storage device 10 comprises six energy storage stacks 11 to 16, a housing 200, a protective element 280, devices 300, a device cooler 350, and a refrigerant line 400. The number of energy storage stacks is not limited to six. Each of the energy storage stacks 11 to 16 is designed in the form of a rectangular parallelepiped, which is elongated in a first direction DR1. As shown in 2 As shown, the six energy storage stacks 11 to 16 are arranged side by side along a second direction DR2, which is orthogonal to both the first direction DR1 and the up-down direction. In the present embodiment, the first direction DR1 corresponds to the front-to-back direction or the longitudinal direction of the vehicle, and the second direction DR2 corresponds to the right-to-left direction (lateral direction) of the vehicle. Each of the energy storage stacks 11 to 16 comprises at least one energy storage cell 100. In the present embodiment, each of the energy storage stacks 11 to 16 comprises a plurality of energy storage cells 100 and a plurality of cooling plates 150. The 100 energy storage cells are arranged side by side along the first direction DR1. As shown in 3 As shown, each of the energy storage cells 100 comprises an electrode body 112