KR-20260067313-A - ENERGY STORAGE DEVICE

KR20260067313AKR 20260067313 AKR20260067313 AKR 20260067313AKR-20260067313-A

Abstract

The capacitor device comprises a plurality of capacitor cells, a bottom wall, and a panel member that defines a smoke exhaust path together with the bottom wall. Each capacitor cell includes a cell case that accommodates an electrode body. A safety valve is provided on the lower surface of the cell case. The bottom wall has a through hole provided at a position opposite to the safety valve. The safety valve has an opening portion that opens when the internal pressure of the cell case reaches a reference value, and a connecting portion that connects the cell case and the opening portion. The connecting portion can be deformed into a shape that bulges outward toward the cell case when the internal pressure of the cell case reaches a reference value.

Inventors

이와타 마코토
이시카와 쇼타로
후지와라 스케
나카무라 소이치로
나카노 다카히코
스즈키 고스케
이시즈카 마사히로
마츠오 겐스케
구마자와 가즈야

Assignees

도요타지도샤가부시키가이샤

Dates

Publication Date: 20260512
Application Date: 20250930
Priority Date: 20241105

Claims (4)

It is a capacitor, and Multiple capacitor cells and, A bottom wall disposed below the plurality of capacitor cells, and A panel member provided below the above-mentioned bottom wall and defining a smoke exhaust path together with the above-mentioned bottom wall, and Each of the above plurality of capacitor cells includes a cell case that accommodates an electrode body, and A safety valve is provided on the lower surface of the cell case above, and The above-mentioned bottom wall has a through hole provided at a position opposite to the safety valve, and The above safety valve is, A part that opens when the internal pressure of the above cell case reaches a reference value, and having a connecting part that connects the cell case and the opening part, The above connection part is a capacitor device capable of deforming into a shape that bulges outward toward the outside of the cell case when the internal pressure of the cell case reaches the reference value.
In paragraph 1, The above connection portion is a capacitor device having a shape that is concave toward the inside of the cell case when the internal pressure of the cell case is less than the reference value.
In paragraph 1, The above-mentioned split section is a capacitor device in which the thickness gradually decreases from the above-mentioned connection section toward the center of the split section.
In paragraph 1, A capacitor device in which the distance between the lower surface of the cell case and the upper surface of the bottom wall is set to a length such that when the split portion is split, the lower end of the split portion is located within the through hole.

Description

Energy Storage Device The present disclosure relates to a storage device. For example, Japanese Patent Publication No. 2023-126584 discloses a battery comprising a plurality of cells, a case accommodating the plurality of cells, a protective member protecting the bottom portion of the case, and a cover. The protective member is fixed to the bottom portion of the case by means of a fastener. A relief mechanism is provided on the bottom surface of each cell. The discharge emitted from the relief mechanism flows into a collection cavity formed between the bottom portion of the case and the protective member. The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention are described below with reference to the accompanying drawings, in which similar reference numerals indicate similar elements. FIG. 1 is a schematic drawing showing a vehicle equipped with a battery storage device in one embodiment of the present disclosure. FIG. 2 is a perspective view schematically showing a capacitor device. Figure 3 is a plan view schematically showing the state in which the upper cover has been removed from the capacitor. Figure 4 is a cross-sectional view along line IV-IV in Figure 3. Figure 5 is a schematic diagram showing a safety valve. Figure 6 is a cross-sectional view along the line VI-VI in Figure 5. Figure 7 is a cross-sectional view schematically showing the state in which the split section is split. Embodiments of the present disclosure will be described with reference to the drawings. In addition, in the drawings referenced below, the same or equivalent components are given the same number. FIG. 1 is a schematic drawing showing a vehicle equipped with a battery storage device according to one embodiment of the present disclosure. FIG. 2 is a perspective view schematically showing a battery storage device. FIG. 3 is a plan view schematically showing a state in which the upper cover is removed from the battery storage device. FIG. 4 is a cross-sectional view along line IV-IV in FIG. 3. As illustrated in FIG. 1, the vehicle (1) is equipped with a vehicle body (2) and a battery storage device (10). Examples of the vehicle (1) include a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a battery electric vehicle. As shown in FIGS. 1 and 2, the vehicle body (2) includes a frame member (20). The frame member (20) is positioned at the bottom of the vehicle body (2). The frame member (20) is formed in a roughly rectangular shape that surrounds the battery storage device (10). The energy storage device (10) is installed on a frame member (20). As shown in FIGS. 1 to 4, the energy storage device (10) is equipped with six energy storage stacks (11 to 16), a housing (200), equipment (300), an equipment cooler (350), and a refrigerant pipe (400). Additionally, the number of energy storage stacks is not limited to six. Each capacitor stack (11 to 16) is formed in the shape of a rectangular parallelepiped long in the first direction. As shown in FIG. 3, six capacitor stacks (11 to 16) are arranged side by side along a second direction that is orthogonal to both the first direction and the up-down direction. In this embodiment, the first direction corresponds to the front-rear direction of the vehicle, and the second direction corresponds to the left-right direction (width direction) of the vehicle. Each capacitor stack (11 to 16) includes at least one capacitor cell (100). In this embodiment, each capacitor stack (11 to 16) includes a plurality of capacitor cells (100) and a plurality of cooling plates (150). A plurality of capacitor cells (100) are arranged side by side along a first direction. As shown in FIG. 4, each capacitor cell (100) has an electrode body (112), a cell case (114), and a pair of external terminals (116). The electrode body (112) may be composed of a wound body in which a positive electrode sheet and a negative electrode sheet are wound with a separator in between, or may be composed of a laminated body in which a positive electrode sheet and a negative electrode sheet are stacked with a separator in between. The electrode body (112) is formed in a long shape in the second direction. The cell case (114) accommodates the electrode body (112). The cell case (114) is formed in the shape of a rectangular parallelepiped. The cell case (114) is made of a metal such as aluminum. A safety valve (115) is provided on the lower surface of the cell case (114). Details of the safety valve (115) will be described later. A pair of external terminals (116) are provided on the upper surface of the cell case (114). A pair of external terminals (116) are provided at positions spaced apart from each other in the width direction of the cell case (114). Additionally, the width direction of the cell case (114) corresponds to the second direction. As shown in FIG. 4, each cooling plate (150) is positioned between a pair of capacitor cells (100) adjacent to eac