DE-102025146406-A1 - ENERGY STORAGE DEVICE

Abstract

An energy storage device comprises a plurality of energy storage cells, a bottom wall, and a panel element that, together with the bottom wall, defines an exhaust path. Each energy storage cell includes a cell housing that accommodates an electrode array and a safety valve located on the underside of the cell housing. The bottom wall has a through-hole located opposite the safety valve. The length of the upper end section of the through-hole in a second direction is greater than the length of the safety valve in a second direction.

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

20251111

Priority Date

20241113

Claims (4)

1. Energy storage device comprising: a plurality of energy storage cells arranged along a first direction; a bottom wall arranged below the energy storage cells; and a panel element arranged below the bottom wall, which together with the bottom wall defines an exhaust path, wherein each of the energy storage cells includes a cell housing accommodating an electrode arrangement, and a safety valve arranged on the underside of the cell housing, the bottom wall having a through-hole arranged at a position opposite the safety valve, and a length of an upper end section of the through-hole in a second direction, perpendicular to both directions, first direction and top-bottom direction, greater than a length of the safety valve in the second direction.
2. Energy storage device according to Claim 1 , wherein the length of the upper end section of the through-hole in the first direction is greater than the length of the safety valve in the first direction.
3. Energy storage device according to Claim 1 or 2 , which further comprises an enclosing element arranged between the cell casing and the bottom wall and which has a shape enclosing the through-hole.
4. Energy storage device according to Claim 3 , further comprising a protective element arranged on the underside wall, wherein the protective element includes: a plurality of thermal insulation elements, each closing a corresponding number of the through-holes, and a retaining film that holds the thermal insulation elements, and at least a part of the enclosure element is in contact with an underside of the cell housing and the retaining film.

Description

BACKGROUND OF THE INVENTION 1. Field of the invention The present disclosure relates to an energy storage device. 2. Description of the nearest state of the art The Japanese Disclosure Document No. 2023-126584 ( JP 2023-126584 A For example, [reference] discloses a battery comprising a plurality of cells, a casing that houses the cells, a protective element that protects a subsection of the casing, and a cover. Each cell includes a casing that houses an electrode assembly. A discharge mechanism is provided on the underside of the casing, and an external terminal is provided on the top side of the casing. Waste discharged by the discharge mechanism flows into a collection cavity formed between the subsection of the casing and the protective element. SUMMARY OF THE INVENTION The battery that is in JP 2023-126584 A As described, there are concerns that when waste is released from the cell's discharge mechanism, some of the waste diffuses into the casing without flowing into the collection cavity. One objective of the present disclosure is to provide an energy storage device in which it can be prevented that waste emitted from an energy storage cell diffuses between a cell casing and a subwall. An energy storage device according to one aspect of the present disclosure comprises a plurality of energy storage cells arranged along a first direction, a bottom wall arranged below the energy storage cells, and a panel element arranged below the bottom wall, which together with the bottom wall defines an exhaust path, wherein each of the energy storage cells comprises a cell housing accommodating an electrode arrangement and a safety valve arranged on a bottom of the cell housing, the bottom wall having a through-hole arranged at a position opposite the safety valve, and a length of an upper end section of the through-hole in a second direction, which is perpendicular to both directions, first direction and top-bottom direction, is greater than a length of the safety valve in the second direction. According to the present disclosure, an energy storage device can be provided which is capable of preventing the diffusion of waste emitted by an energy storage cell between a cell casing and a subwall. BRIEF DESCRIPTION OF THE FIGURES Features, advantages and a technical and industrial significance of exemplary embodiments of the invention are described below with reference to the accompanying drawings, in which the same reference numerals denote the same elements, and wherein: 1 a perspective view that schematically shows an energy storage device according to an embodiment of the present disclosure; 2 a top view schematically showing the energy storage device in a state where a top cover is removed; 3 a cross-sectional view along line III-III in 2 is; and 4 a cross-sectional view along line IV-IV in 2 is. DETAILED DESCRIPTION OF EXECUTION FORMS One embodiment of the present disclosure is described with reference to the drawings. It should be noted that in the drawings referred to below, elements that are identical or equivalent are designated with the same numbers. 1 Figure 1 is a perspective view schematically showing an energy storage device according to an embodiment of the present disclosure. 2 is a top view schematically showing the energy storage device with a top cover removed from it. 3 is a cross-sectional view along line III-III in 2 . 4 a cross-sectional view along line IV-IV in 2 is. An energy storage device 10 according to the present embodiment is, for example, installed on a lower part of a vehicle. Examples of the vehicle include a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a battery electric vehicle. As in the 1 until 4 As shown, the energy storage device 10 comprises six energy storage stacks 11 to 16, a housing 200, protective elements 280, enclosure elements 290, equipment 300, an equipment cooler 350, and a coolant pipe 400. It should be noted that 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 cuboid extending in a first direction DR1. As in 2 As shown, the six energy storage stacks 11 to 16 are arranged such that they are positioned along a second direction DR2, which is perpendicular to both directions, the first direction DR1 and the up-down direction. In the present embodiment, the first direction DR1 corresponds to a front-back direction of the vehicle and the second direction DR2 to a right-left direction (lateral direction) of the vehicle. Each of the energy storage stacks 11 to 16 includes at least one energy storage cell 100. In the present embodiment, each of the energy storage stacks 11 to 16 includes a plurality of energy storage cells 100 and a plurality of cooling plates 150. The energy storage cells 100 are arranged so that they are aligned along the first direction DR1. As shown in 3 As shown, each energy storage cell 100 includes an electrode assembly 112, a cell housing 114 and a