CN-122000605-A - Power storage device

Abstract

The power storage device includes a plurality of power storage cells, a bottom wall, and a panel member defining a smoke discharge path together with the bottom wall. Each of the power storage cells includes a cell case accommodating the electrode body. The lower surface of the single body shell is provided with a safety valve. The bottom wall has a through hole provided at a position facing the relief valve. The safety valve includes a cleavage portion that cleaves when the internal pressure of the single body case reaches a reference value, and a connection portion that connects the single body case and the cleavage portion. The connecting portion is deformable to a shape that bulges outward of the unit case when the internal pressure of the unit case reaches a reference value.

Inventors

• IWATA MAKOTO
• ISHIKAWA SHOTARO
• FUJIWARA SHUNSUKE
• NAKAMURA KEIICHIRO
• NAKANO TAKAHIKO
• SUZUKI YASUSUKE
• Ishizumi Masahiro
• MATSUO KENSUKE
• Kumuma Yoshiya

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260508

Application Date

20251029

Priority Date

20241105

Claims (4)

1. 1. An electric storage device, comprising: A plurality of electric storage monomers; A bottom wall disposed below the plurality of power storage cells, and A panel member disposed below the bottom wall and defining a smoke discharge path together with the bottom wall, The plurality of electric storage cells respectively comprise a cell housing for accommodating the electrode body, A safety valve is arranged on the lower surface of the single body shell, The bottom wall has a through hole provided at a position opposed to the safety valve, The relief valve has: A cracking part which cracks when the internal pressure of the single shell reaches a reference value, and A connecting portion connecting the single body case and the split portion, The connecting portion is deformable to a shape bulging outward of the unit case when the internal pressure of the unit case reaches the reference value.
2. 2. The power storage device according to claim 1, wherein, The coupling portion has a shape recessed toward an inner side of the unit case when an inner pressure of the unit case is smaller than the reference value.
3. 3. The power storage device according to claim 1, wherein, The thickness of the split portion gradually decreases from the connecting portion toward the center of the split portion.
4. 4. The power storage device according to claim 1, wherein, The distance between the lower surface of the single body case and the upper surface of the bottom wall is set to a length such that the lower end portion of the cleavage portion is located in the through hole when the cleavage portion has been cleaved.

Description

Power storage device Technical Field The present disclosure relates to an electric storage device. Background For example, japanese patent application laid-open No. 2023-126584 discloses a battery provided with a plurality of cells, a case accommodating the plurality of cells, a protection member protecting a bottom portion of the case, and a cover. The protection member is fixed to the bottom portion of the housing by a fastener. The bottom surface of each monomer is provided with a pressure release mechanism. The exhaust discharged from the pressure release mechanism flows into a collection chamber formed between the bottom of the housing and the protective member. Disclosure of Invention In the battery described in japanese patent application laid-open No. 2023-126584, the exhaust discharged from the pressure release mechanism of one cell may adhere to other cells. The purpose of the present disclosure is to provide a power storage device that can suppress the adhesion of an exhaust from one power storage cell to other power storage cells. The power storage device according to one embodiment of the present disclosure includes a plurality of power storage cells, a bottom wall disposed below the plurality of power storage cells, and a panel member disposed below the bottom wall and defining a smoke discharge path together with the bottom wall, wherein each of the plurality of power storage cells includes a cell case accommodating an electrode body, a safety valve is disposed on a lower surface of the cell case, the bottom wall has a through hole disposed at a position opposed to the safety valve, the safety valve has a cleavage portion that is cleaved when an internal pressure of the cell case reaches a reference value, and a connection portion that connects the cell case and the cleavage portion, and the connection portion is deformable to a shape that bulges outward of the cell case when the internal pressure of the cell case reaches the reference value. According to the present disclosure, it is possible to provide an electric storage device capable of suppressing adhesion of an exhaust from one electric storage monomer to other electric storage monomers. Drawings Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals denote like elements, in which: Fig. 1 is a diagram schematically showing a vehicle provided with an electric storage device according to an embodiment of the present disclosure. Fig. 2 is a perspective view schematically showing the power storage device. Fig. 3 is a plan view schematically showing a state in which the upper cover is removed from the power storage device. Fig. 4 is a cross-sectional view taken along line IV-IV in fig. 3. Fig. 5 is a diagram schematically showing a safety valve. Fig. 6 is a cross-sectional view taken along line VI-VI in fig. 5. Fig. 7 is a sectional view schematically showing a state in which a crack portion has been broken. Detailed Description Embodiments of the present disclosure will be described with reference to the accompanying drawings. In the drawings referred to below, the same or corresponding components are denoted by the same reference numerals. Fig. 1 is a diagram schematically showing a vehicle provided with an electric storage device according to an embodiment of the present disclosure. Fig. 2 is a perspective view schematically showing the power storage device. Fig. 3 is a plan view schematically showing a state in which the upper cover is removed from the power storage device. Fig. 4 is a cross-sectional view taken along line IV-IV in fig. 3. As shown in fig. 1, a vehicle 1 includes a vehicle body 2 and an electric storage device 10. Examples of the vehicle 1 include a hybrid vehicle (ELECTRIC VEHICLE), a plug-in hybrid vehicle (ELECTRIC VEHICLE), and an electric vehicle (battery ELECTRIC VEHICLE). As shown in fig. 1 and 2, the vehicle body 2 includes a frame member 20. The frame member 20 is disposed at the bottom of the vehicle body 2. The frame member 20 is formed in a substantially square cylindrical shape surrounding the power storage device 10. Power storage device 10 is mounted on frame member 20. As shown in fig. 1 to 4, the power storage device 10 includes six power storage stacks 11 to 16, a housing 200, equipment 300, an equipment cooler 350, and a refrigerant pipe 400. In addition, the number of the electric storage stacks is not limited to six. Each of the power storage stacks 11 to 16 is formed in a rectangular parallelepiped shape elongated in the first direction. As shown in fig. 3, the six power storage stacks 11 to 16 are arranged so as to be aligned along a second direction orthogonal to both the first direction and the up-down direction. In the present embodiment, the first direction corresponds to the front-rear direction of the vehicle, and the second directio