DE-102025139641-A1 - ENERGY STORAGE DEVICE

Abstract

An energy storage device comprises the following: a plurality of energy storage cells arranged along a single direction; a bottom wall arranged beneath the energy storage cells; and a plate element positioned beneath the bottom wall, which, together with the bottom wall, defines a smoke extraction path. A safety valve is provided in a lower surface of each energy storage cell. The bottom wall comprises a plurality of breakable sections positioned opposite each safety valve.

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

20250930

Priority Date

20241113

Claims (5)

1. Energy storage device comprising: a plurality of energy storage cells arranged along one direction; a bottom wall arranged below the energy storage cells; and a plate element provided below the bottom wall, which together with the bottom wall defines a smoke extraction path, wherein a safety valve is provided in a lower surface of each of the energy storage cells; and the bottom wall has several breakable sections, each provided at a position opposite the safety valve.
2. Energy storage device according to Claim 1 , wherein the bottom wall comprises: an upper plate section provided below the energy storage cells, and a lower plate section provided below the upper plate section; and each of the fragile sections is provided in the upper plate section.
3. Energy storage device according to Claim 2 , where the thickness of the fragile sections is less than the thickness of the upper plate section.
4. Energy storage device according to Claim 3 , wherein a top side of the fragile sections is arranged below a top side of the upper plate section; and a bottom side of the fragile sections is flush with a bottom side of the upper plate section.
5. Energy storage device according to one of the Claims 2 until 4 , further with a surrounding element that is provided between each of the energy storage cells and the upper plate section and surrounds the fragile sections.

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 Explanation of the state of the art The Japanese unpublished patent application No. 2023-126584 ( JP 2023-126584 A For example, [reference] discloses a battery comprising multiple cells, a housing that contains the cells, a protective element that protects a base area of the housing, and a cover. Each cell includes a box that contains an electrode assembly. A relief mechanism is provided in a base surface of the box. Exhaust gases exiting the relief mechanism flow into a collection cavity formed between the base section of the housing and the protective element. BRIEF EXPLANATION OF THE INVENTION In the battery, which is in the JP 2023-126584 A As described, a thermal insulation element made of mica or similar material can be arranged on a portion of the base of the casing facing the relief mechanism to protect the underside of the cells from gases contained in the exhaust gases from the cells. However, the cost of the thermal insulation element increases with the number of cells. The objective of the present disclosure is to provide an energy storage device that can protect the underside of energy storage cells from a gas, while suppressing a significant increase in cost. One aspect of the present disclosure provides for an energy storage device comprising: a plurality of energy storage cells arranged along a direction; a bottom wall arranged below the energy storage cells; and a plate element provided below the bottom wall, which together with the bottom wall defines a smoke vent path, wherein: a safety valve is provided in a lower surface of each of the energy storage cells; and the bottom wall comprises several breakable sections, each provided at a position facing the safety valve. According to the present disclosure, an energy storage device is provided which is able to protect the underside of energy storage cells from a gas while suppressing a significant increase in costs. 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 reference numerals denote the same elements, and in which: 1 a perspective view that schematically represents an energy storage device according to an embodiment of the present disclosure; 2 a top view schematically showing 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 top view of a fragile section; 5 a cross-sectional view that schematically represents a modification of a floor wall and fragile sections; and 6 a cross-sectional view that schematically represents a modification of a floor wall and fragile sections. DETAILED EXPLANATION OF EXECUTION FORMS One embodiment of the present disclosure is described with reference to the figures. In the figures mentioned 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 represents 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 . 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, a plug-in hybrid electric vehicle, or a battery electric vehicle. As in the 1 to 3 As shown, the energy storage device 10 comprises six energy storage stacks 11 to 16, a housing 200, a surrounding element 290, devices 300, a device cooler 350, and a cooling or 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-rear direction or 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, a cell housing 114 and a pair of external terminals 116.