DE-102025127487-A1 - ENERGY STORAGE DEVICE

DE102025127487A1DE 102025127487 A1DE102025127487 A1DE 102025127487A1DE-102025127487-A1

Abstract

An energy storage device comprises several energy storage cells, a base wall, a plate element, and a pair of retention sections. Safety valves are located in the lower surfaces of the energy storage cells. The base wall has several through-holes and an insertion hole through which at least one of the retention sections is provided. At least one of the retention sections includes a base located in an exhaust duct. The retention sections are designed to reduce a restraining force to retain the energy storage cells when the temperature of the base is equal to or higher than a reference value.

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: 20250714
Priority Date: 20241113

Claims (4)

Energy storage device comprising: multiple energy storage cells arranged in one direction; a bottom wall arranged below the energy storage cells; a plate element arranged below the bottom wall, which together with the bottom wall defines an exhaust path; and a pair of retention sections that restrain the energy storage cells from both sides of the energy storage cells in one direction, wherein safety valves are arranged in the lower surfaces of the energy storage cells, the bottom wall comprising: multiple through-holes arranged facing the safety valves; and an insertion hole through which at least one of the retention sections is inserted, at least one of the retention sections comprising a base arranged in the exhaust path, and the retention sections being designed to reduce a restraining force for holding the energy storage cells when a temperature of the base is equal to or higher than a reference value.
Energy storage device according to Claim 1 , wherein: one of the retention sections further comprises a retention section body extending upwards from the base; the retention section body, together with the other of the retention sections, exerts the retention force on the energy storage cells; and the base is made of a material that softens when the temperature of the base is equal to or higher than the reference value.
Energy storage device according to Claim 1 , further comprising a retaining band which is in thermal contact with the retaining sections and connects the retaining sections together, wherein: at least one of the retaining sections comprises a retaining plate which includes the base; and the retaining band expands to reduce the retaining force when a temperature of the retaining band becomes equal to or higher than the reference value.
Energy storage device according to Claim 3 , which further comprises: an upper cover arranged above the energy storage cells; and an intermediate element arranged between the retaining strap and the upper cover.

Description

BACKGROUND OF THE INVENTION 1. Field of the invention The present disclosure relates to an energy storage device. 2. Description of the state of the art For example, the JP 2023-126584 ( JP 2023-126584 A) A multi-cell battery, a housing containing the cells, a protective element protecting a bottom section of the housing, and a cover. Each cell comprises a box containing an electrode assembly. A relief mechanism is located in a lower surface of the box. The exhaust air discharged by the relief device flows into a collection cavity formed between the bottom section of the housing and the protective element. BRIEF SUMMARY OF THE INVENTION In the JP 2023-126584 In the battery described, if the cell generates heat due to a short circuit, etc., in the electrode arrangement, it may be necessary to reduce the amount of heat transferred from the heat-generating cell to a cell adjacent to that cell. One objective of the present disclosure is to provide an energy storage device that can prevent heat transfer from a heat-generating energy storage cell to an energy storage cell adjacent to that energy storage cell. An energy storage device according to one aspect of the present disclosure comprises: several energy storage cells arranged in one direction; a bottom wall arranged below the energy storage cells; a plate element arranged below the bottom wall, which together with the bottom wall defines an exhaust path; and a pair of retention sections that restrain the energy storage cells from both sides of the energy storage cells in one direction, with safety valves arranged in the lower surfaces of the energy storage cells. The bottom wall comprises: several through-holes arranged facing the safety valves; and an insertion hole through which at least one of the retention sections is inserted. At least one of the retention sections comprises a base arranged in the exhaust path. The retention sections are designed to reduce a restraining force for holding back the energy storage cells when the temperature of the base is equal to or higher than a reference value. According to the present disclosure, it is possible to provide an energy storage device that can suppress the heat transfer from the heat-generating energy storage cell to the energy storage cell adjacent to this energy storage cell. BRIEF DESCRIPTION OF THE DRAWINGS The following describes the features, advantages, and technical and industrial significance of exemplary embodiments of the invention 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 with the top cover removed; 3 a sectional view along a line III-III in 2 is; and 4 This is a sectional view that schematically shows a modification of the retention sections. DETAILED DESCRIPTION OF EXECUTIONS An embodiment of the present disclosure is described below with reference to the drawings. In the drawings referred to below, the same or corresponding elements are provided with the same reference numerals. 1 is a perspective view that schematically shows an energy storage device according to an embodiment of the present disclosure. 2 is a top view schematically showing the energy storage device with the top cover removed. 3 is a sectional view along a line III-III in 2 . An energy storage device 10 according to the present embodiment is, for example, mounted on a lower part of a vehicle. Examples of the vehicle are an electric hybrid vehicle, a plug-in electric hybrid vehicle, and a battery-powered electric vehicle. As it is in the 1 to 3 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 coolant tube 400. The number of energy storage stacks is not limited to six. Each of the energy storage stacks 11 to 16 has the shape of a cuboid that is extended in a first direction DR1. As shown in 2 As shown, the six energy storage stacks 11 to 16 are arranged in a second direction DR2, which is perpendicular to both the first direction DR1 and an up-down direction. In the present embodiment, the first direction DR1 corresponds to the front-back direction of the vehicle, and the second direction DR2 corresponds to the right-left (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 several energy storage cells 100 and several cooling plates 150. The 100 energy storage cells are arranged in the first direction DR1. As shown in 3 As shown, each energy storage cell 100 comprises an electrode assembly 112, a cell housing 114 and a pair of external terminals 116. The electrode arrangement 112 can be a wound electro