Power storage device

Abstract

To provide a power storage device capable of suppressing transfer of a load inputted from above onto a power storage cell.SOLUTION: A power storage device 1 includes: a power storage module including a plurality of power storage cells 110; a bus bar connecting external terminals; a heat insulating plate 300 covering the external terminals and the bus bar from above; a binding member 400 binding the heat insulating plate to the power storage module; and a load receiving member 500 that is provided at a position adjacent to the power storage module and that receives a load inputted from above. The load receiving member 500 has a load receiving surface 510 receiving the load at a position higher than the upper surface of the heat insulating plate. The binding member 400 is located at a position higher than the upper surface of the heat insulating plate.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a power storage device.

Background Art

[0002] For example, Japanese Patent Application Laid-Open No. 2023-46898 discloses a battery pack including a plurality of battery cells, a bus bar, and a mica plate. On the upper surface of each battery cell, a pair of electrode terminals and a safety valve are provided. The bus bar connects the electrode terminals of adjacent battery cells to each other. The mica plate covers the electrode terminals and the bus bar.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the battery pack described in Japanese Patent Application Laid-Open No. 2023-46898, there is room for improvement in the transmission of the load input from above to the power storage cells.

[0005] An object of the present disclosure is to provide a power storage device capable of suppressing the transmission of a load input from above to power storage cells.

Means for Solving the Problems

[0006] A power storage device according to an aspect of the present disclosure includes a power storage module including a plurality of power storage cells each having an external terminal, a bus bar connecting the external terminals of the plurality of power storage cells, a heat insulating plate made of a heat insulating material and covering the external terminals and the bus bar from above, a fastening member fastening the heat insulating plate to the power storage module, and a load receiving member provided at a position adjacent to the power storage module and receiving a load input from above. The load receiving member has a load receiving surface that receives the load at a position higher than the upper surface of the heat insulating plate, and the fastening member is located at a position higher than the upper surface of the heat insulating plate.

Effect of the Invention

[0007] According to the present disclosure, it is possible to provide a power storage device capable of suppressing transmission of a load input from above to a power storage cell.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0009] Embodiments of the present disclosure will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

[0010] FIG. 1 is a plan view schematically showing a power storage device according to an embodiment of the present disclosure. FIG. 2 is a plan view schematically showing a part of a power storage module. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1. This power storage device 1 is mounted on a vehicle, for example.

[0011] As shown in FIGS. 1 to 3, the power storage device 1 includes at least one power storage module 100, a cell case 200, at least one heat insulating plate 300, a plurality of fastening members 400, at least one load receiving member 500, and at least one voltage monitoring unit 600.

[0012] As shown in FIG. 1, at least one power storage module 100 includes a plurality of power storage modules 100. In this embodiment, the power storage device 1 includes 13 power storage modules 100. However, the number of power storage modules 100 is not limited to 13. Each power storage module 100 is formed in a rectangular shape that is long in one direction (the first direction) in plan view. A part of the plurality of power storage modules 100 is arranged so as to be spaced apart in a direction (the second direction) orthogonal to the one direction.

[0013] As shown in FIGS. 1 and 2, each power storage module 100 has a plurality of power storage cells 110, a pair of end plates 120, and a plurality of bus bars 130.

[0014] The plurality of power storage cells 110 are arranged so as to be aligned in the first direction. Examples of each power storage cell 110 include a lithium ion battery. Each power storage cell 110 may be configured by an all-solid-state battery using a solid electrolyte. Each power storage cell 110 is formed in a flat rectangular parallelepiped shape.

[0015] As shown in FIG. 2, each power storage cell 110 has a pair of external terminals 112 and a smoke exhaust port 114. Each external terminal 112 and the smoke exhaust port 114 are formed on the upper surface of the housing of the power storage cell 110. The smoke exhaust port 114 is a valve for discharging the smoke gas generated inside the housing. The smoke exhaust port 114 is provided between the pair of external terminals 112 in the second direction. Note that the smoke gas may contain an electrolytic solution, metal pieces, and the like.

[0016] The bus bar 130 connects the external terminals 112 of a pair of adjacent power storage cells 110 to each other. Thereby, the plurality of power storage cells 110 are electrically connected in series.

[0017] The cell case 200 houses the power storage module 100. As shown in FIG. 3, the cell case 200 has a lower case 210 and an upper cover 220. Note that in FIG. 1, the illustration of the upper cover 220 is omitted.

[0018] The lower case 210 houses a plurality of power storage modules 100 and is open upward. As shown in FIGS. 1 and 3, the lower case 210 has a bottom wall 212, a peripheral wall 214, and a plurality of cross members 216.

[0019] The bottom wall 212 supports a plurality of power storage modules 100. The bottom wall 212 may be formed in a flat plate shape.

[0020] The peripheral wall 214 stands up from the peripheral edge of the bottom wall 212. The peripheral wall 214 collectively surrounds a plurality of power storage modules 100.

[0021] The plurality of cross members 216 are arranged at intervals in a direction (second direction) orthogonal to the longitudinal direction of each power storage module 100. Each cross member 216 extends along the longitudinal direction (first direction) of the power storage module 100. Each cross member 216 partitions between the power storage modules 100 adjacent to each other in the second direction. The ends of each cross member 216 are connected to the peripheral wall 214. As shown in FIG. 3, the upper surface of each cross member 216 is at a position lower than the upper surface of each power storage module 100.

[0022] The upper cover 220 covers a plurality of power storage modules 100. The upper cover 220 is open downward. The upper cover 220 houses the power storage module 100 together with the lower case 210. As shown in FIG. 3, the upper cover 220 has a top wall 222 located above the plurality of power storage modules 100. The top wall 222 may be formed in a flat plate shape.

[0023] Each heat insulation plate 300 is made of a heat insulating material and is disposed on the power storage module 100. Examples of the heat insulating material include mica obtained by solidifying natural inorganic minerals by hot pressing. Each heat insulation plate 300 covers the external terminal 112 and the bus bar 130 from above. Each heat insulation plate 300 may be formed in a flat plate shape. As shown in FIGS. 1 and 3, the outer shape of each heat insulation plate 300 in a plan view is the same as the outer shape of each power storage module 100 in a plan view. However, the outer shape of each heat insulation plate 300 may be slightly smaller or slightly larger than the outer shape of each power storage module 100.

[0024] Each fastening member 400 fastens the heat insulation plate 300 to the power storage module 100. Specifically, each fastening member 400 fastens the heat insulation plate 300 to the end plate 120. As shown in FIG. 2, an insertion hole 120h into which the fastening member 400 is inserted is formed on the upper surface of the end plate 120. As shown in FIG. 3, the fastening member 400 is located at a position higher than the upper surface of the heat insulation plate 300. As shown in FIGS. 1 and 3, each fastening member 400 is disposed in the peripheral region of the cell case 200.

[0025] At least one load receiving member 500 includes a plurality of load receiving members 500. In the present embodiment, the power storage device 1 includes five load receiving members 500. However, the number of the load receiving members 500 is not limited to five.

[0026] Each load receiving member 500 is provided at a position adjacent to the power storage module 100. As shown in FIG. 3, each load receiving member 500 is fixed on the cross member 216. Each load receiving member 500 receives a load input from above with respect to the power storage device 1. Specifically, each load receiving member 500 transmits the load input to the top wall 222 of the power storage device 1 to the bottom wall 212 via the cross member 216.

[0027] Each load receiving member 500 has a pair of load receiving surfaces 510 that each receive a load. The pair of load receiving surfaces 510 are provided at positions spaced apart from each other in the first direction. As shown in FIG. 1, one of the pair of load receiving surfaces 510 is provided at a position overlapping in the second direction with one of a pair of power storage modules 100 adjacent to each other in the first direction, and the other of the pair of load receiving surfaces 510 is provided at a position overlapping in the second direction with the other of a pair of power storage modules 100 adjacent to each other in the first direction. As shown in FIG. 3, each load receiving surface 510 is located at a position higher than the upper surface of the heat insulating plate 300. As shown in FIGS. 1 and 3, the load receiving surface 510 of each load receiving member 500 is provided in the central region of the cell case 200. In other words, each fastening member 400 is provided in a region around the central region where the load receiving surface 510 is disposed. The upper surface of each fastening member 400 is located at the same height position as or higher than the height position of the load receiving surface 510.

[0028] At least one voltage monitoring unit 600 includes a plurality of voltage monitoring units 600. In the present embodiment, the power storage device 1 includes five voltage monitoring units 600. However, the number of voltage monitoring units 600 is not limited to five.

[0029] Each voltage monitoring unit 600 is disposed between a pair of power storage modules 100 adjacent to each other in the second direction. As shown in FIG. 3, each voltage monitoring unit 600 is fixed on the cross member 216. The voltage monitoring unit 600 monitors the voltage of at least one of the pair of power storage modules 100. The voltage monitoring unit 600 is disposed adjacent to the load receiving member 500.

[0030] As described above, in the power storage device 1 of the present embodiment, the load receiving surface 510 of the load receiving member 500 receives the load from above, and the load is also received by the fastening member 400, so that the transmission of the load to the power storage cell 110 is suppressed.

[0031] Those skilled in the art will understand that the above-described exemplary embodiments are specific examples of the following aspects.

[0032] [Aspect 1] A power storage module including a plurality of power storage cells each having an external terminal; A bus bar connecting the external terminals of the plurality of power storage cells; A heat insulating plate made of a heat insulating material and covering the external terminals and the bus bar from above; A fastening member fastening the heat insulating plate to the power storage module; A load receiving member provided at a position adjacent to the power storage module and receiving a load input from above, and comprising: The load receiving member has a load receiving surface for receiving the load at a position higher than the upper surface of the heat insulating plate; The fastening member is located at a position higher than the upper surface of the heat insulating plate, a power storage device.

[0033] In this power storage device, since the load receiving surface of the load receiving member receives the load from above and the load is also received by the fastening member, the transmission of the load to the power storage module is suppressed.

[0034] [Aspect 2] The upper surface of the fastening member is located at the same height position as or higher than the height position of the load receiving surface, the power storage device according to Aspect 1.

[0035] [Aspect 3] The power storage module includes a pair of end plates disposed outside the plurality of power storage cells in the arrangement direction of the plurality of power storage cells; The fastening member fastens the heat insulating plate to the end plate, the power storage device according to Aspect 1 or 2.

[0036] In this aspect, since the load from above is transmitted to the end plate, the transmission of the load to the power storage cell is more reliably suppressed.

[0037] [Aspect 4] Another power storage module provided at a position adjacent to the power storage module; It is disposed between the power storage module and the other power storage module, and further includes a voltage monitoring unit that monitors at least one of the voltages of the power storage module and the other power storage module. The load receiving member is disposed between the power storage module and the other power storage module and at a position adjacent to the voltage monitoring unit. The voltage monitoring unit is disposed between the fastening member and the load receiving member. The power storage device according to any one of Aspects 1 to 3.

[0038] [Aspect 5] It further includes a cell case that houses the power storage module. The load receiving surface is provided in a central region of the cell case. The fastening member is provided in a region around the central region. The power storage device according to any one of Aspects 1 to 4.

[0039] It should be noted that the embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. The scope of the present disclosure is indicated by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope equivalent to the claims.

Description of Reference Numerals

[0040] 1 Power storage device, 100 Power storage module, 110 Power storage cell, 112 External terminal, 114 Smoke exhaust port, 120 End plate, 130 Bus bar, 200 Cell case, 210 Lower case, 216 Cross member, 220 Upper cover, 300 Heat insulating plate, 400 Fastening member, 500 Load receiving member, 510 Load receiving surface, 600 Voltage monitoring unit.

Claims

1. A power storage module including a plurality of power storage cells each having an external terminal; A bus bar connecting the external terminals of the plurality of power storage cells; A heat insulating plate made of a heat insulating material and covering the external terminal and the bus bar from above; A fastening member fastening the heat insulating plate to the power storage module; A load receiving member provided at a position adjacent to the power storage module and receiving a load input from above, The load receiving member has a load receiving surface for receiving the load at a position higher than the upper surface of the heat insulating plate, The fastening member is located at a position higher than the upper surface of the heat insulating plate. A power storage device.

2. The upper surface of the fastening member is located at the same height position as or higher than the height position of the load receiving surface. The power storage device according to claim 1.

3. The power storage module includes a pair of end plates disposed outside the plurality of power storage cells in the arrangement direction of the plurality of power storage cells, The fastening member fastens the heat insulating plate to the end plate. The power storage device according to claim 1 or 2.

4. Another power storage module provided at a position adjacent to the power storage module; A voltage monitoring unit disposed between the power storage module and the other power storage module and monitoring at least one voltage of the power storage module and the other power storage module. The load receiving member is disposed between the power storage module and the other power storage module and adjacent to the voltage monitoring unit, The voltage monitoring unit is disposed between the fastening member and the load receiving member. The power storage device according to claim 1.

5. Further comprising a cell case for housing the power storage module, The load receiving surface is provided in the central region of the cell case, The fastening member is provided in a region around the central region, and the power storage device according to claim 1.

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