JP-7856225-B1 - Energy storage device

JP7856225B1JP 7856225 B1JP7856225 B1JP 7856225B1JP-7856225-B1

Abstract

[Problem] To improve smoke exhaust efficiency in an energy storage device that houses energy storage cells, in which cell smoke exhaust valves are provided on the side of the energy storage cells. [Solution] The energy storage device 1 comprises a plurality of energy storage cells 10 and a housing case 20. Each of the plurality of energy storage cells 10 includes a cell exhaust valve provided on the side of the energy storage cell 10 for exhausting gas from inside the energy storage cell 10. The housing case 20 includes a lower case 22, an upper case 21, and a case exhaust valve 23. The case exhaust valve 23 is provided above or below the center of the housing case 20 in the vertical direction. If the case exhaust valve 23 is provided above the center of the housing case 20, the cell exhaust valve is provided above the center of the energy storage cell 10 in the vertical direction. If the case exhaust valve 23 is provided below the center of the housing case 20, the cell exhaust valve is provided below the center of the energy storage cell 10 in the vertical direction. [Selection Diagram] Figure 1

Inventors

杉江和紀
森章夫
加茂吉朗
中野隆彦
霜中俊宏
小橋賢一
曽田雄基

Assignees

トヨタ自動車株式会社

Dates

Publication Date: 20260511
Application Date: 20260303

Claims (2)

It is an energy storage device, Multiple energy storage cells, A peripheral wall surrounding the plurality of energy storage cells, A smoke exhaust valve provided on the peripheral wall, The system comprises a cooler positioned above the plurality of energy storage cells, The peripheral wall includes a first wall portion and a second wall portion arranged in the front-rear direction of the energy storage device. The smoke exhaust valve is provided above the center of the first wall portion in the vertical direction of the energy storage device. The plurality of energy storage cells are arranged to extend in the front-to-back direction, Each of the aforementioned plurality of energy storage cells is The energy storage device is arranged with a gap in the width direction, and has a pair of long sides that extend in the front-rear direction, It includes a first short side and a second short side arranged at intervals in the front-rear direction, The first short side faces the first wall, Each of the plurality of energy storage cells includes a cell smoke exhaust valve, The cell exhaust valve is a power storage device provided above the center of the first short side in the vertical direction .
The energy storage device according to claim 1, wherein in all of the plurality of energy storage cells, the cell exhaust valve is provided above the center of the first short side in the vertical direction.

Description

This disclosure relates to an energy storage device. Japanese Patent Publication No. 2023-17448 (Patent Document 1) discloses a battery pack in which terminals and a smoke exhaust valve for exhausting gas from inside the battery cell are provided at the top of the battery cell, and the gas discharged from the smoke exhaust valve is discharged through an exhaust duct provided at the top of the battery pack. Japanese Patent Publication No. 2023-17448 This is a schematic perspective view showing the energy storage device according to Embodiment 1.This diagram schematically shows an example of an energy storage cell 10.This diagram schematically shows a cross-section of the energy storage device 1 when it is cut through a plane parallel to the short side surface 13 of the energy storage cell 10, passing through the case smoke exhaust valve 23.This is a schematic perspective view showing the energy storage device according to Embodiment 2.This is a schematic perspective view showing the energy storage device according to Embodiment 3.This diagram schematically shows an example of a storage cell 10B.This is a schematic perspective view showing the energy storage device according to Embodiment 4.This is a schematic cross-sectional view showing the energy storage device according to Embodiment 4. The embodiments and modifications described below will be explained with reference to the drawings. In the following description, identical parts and components are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed descriptions of them will not be repeated. The embodiments and modifications described below may be combined selectively as appropriate. [Embodiment 1] The energy storage device according to Embodiment 1 will be described with reference to Figures 1 to 3. Figure 1 is a schematic perspective view showing the energy storage device according to Embodiment 1. Referring to Figure 1, the energy storage device 1 according to Embodiment 1 is used, for example, mounted on a vehicle. Examples of vehicles include hybrid vehicles, plug-in hybrid vehicles, fuel cell vehicles, and electric vehicles. The energy storage device 1 comprises a plurality of energy storage cells 10 and a housing case 20 that accommodates the plurality of energy storage cells 10. The energy storage cell 10 is a secondary battery, typically a lithium-ion secondary battery. A lithium-ion secondary battery is a battery that uses lithium as a charge carrier, and may include not only general lithium-ion secondary batteries with a liquid electrolyte, but also so-called all-solid-state batteries that use a solid electrolyte. Note that the energy storage cell 10 is not limited to a lithium-ion secondary battery; it may also be composed of a nickel-metal hydride secondary battery or other types of secondary batteries. The energy storage cells 10 are arranged to extend in the longitudinal direction D1 of the vehicle. Furthermore, multiple energy storage cells 10 are arranged along the vehicle's width direction D2. The housing case 20 includes an upper case 21, a lower case 22, and a case smoke exhaust valve 23. The lower case 22 includes a bottom plate, a peripheral wall, and multiple partition walls 60, 61, 62, 63, and 64. These multiple partition walls 60, 61, 62, 63, and 64 divide the space within the housing case 20 into multiple sections. The base plate is formed in a flat shape. The peripheral wall is formed to extend upward from the outer edge of the base plate, and the peripheral wall is formed in an annular shape. Partition walls 60, 61, 62, 63, and 64 are provided on the base plate. Partition walls 60, 61, 62, and 63 are formed to extend in the longitudinal direction D1 of the vehicle, and partition wall 64 is formed to extend in the width direction D2 of the vehicle. Partition wall 64 is positioned in the center of the longitudinal direction D1 of the vehicle. Partition walls 60 and 63 are positioned in the center of the width direction D2 of the vehicle. Partition wall 60 is positioned in front of partition wall 64, and partition wall 63 is positioned behind partition wall 64. Multiple energy storage cells 10 are housed in the space formed by assembling the upper case 21 to the lower case 22. Figure 1 shows the energy storage device 1 with the upper case 21 removed. The case exhaust valve 23 is configured to discharge gas from within the housing case 20. The case exhaust valve 23 is located in the upper case 21. Figure 2 is a schematic diagram showing an example of a power storage cell 10. Referring to Figure 2, the power storage cell 10 includes a top surface 11, a bottom surface 12, a pair of short sides 13 and 14, and a pair of long sides 15 and 16. The pair of short sides 13 and 14 are spaced apart in the longitudinal direction D1 of the vehicle. The pair of long sides 15 and 16 are spaced apart in the width direction D2 of the vehicle. Each of the pair of long sides 15 and 16 is formed to