Electricity storage device

Abstract

The utility model provides an electric power storage device, comprising an electric power storage module comprising a plurality of electric power storage units respectively provided with external terminals; a bus bar that connects the external terminals of the plurality of power storage units to each other; a heat insulation plate made of a heat insulation material and covering the external terminal and the bus bar from above; a fastening member that fastens the heat insulation 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 having a load receiving surface for receiving the load at a position higher than the upper surface of the heat insulation plate, and the fastening member being located at a position higher than the upper surface of the heat insulation plate. As a result, it is possible to suppress transmission of a load input from above to the power storage unit.

Description

Technical Field

[0001] The utility model relates to a power storage device. Background Art

[0002] For example, Japanese Unexamined Patent Application Publication No. 2023-46898 discloses a battery pack having a plurality of battery cells, bus bars, and mica plates. A pair of electrode terminals and a safety valve are provided on the upper surface of each battery cell. The bus bars connect the electrode terminals of adjacent battery cells to each other. The mica plates cover the electrode terminals and the bus bars.

[0003] In the battery pack described in Japanese Unexamined Patent Application Publication No. 2023-46898, there is room for improvement in terms of the transfer of a load input from above to the power storage unit. Summary of the Utility Model

[0004] In view of the above situation, an object of the present utility model is to provide a power storage device capable of suppressing the transfer of a load input from above to the power storage unit.

[0005] The power storage device provided by the present utility model includes: a power storage module including a plurality of power storage units each having an external terminal; bus bars connecting the external terminals of the plurality of power storage units to each other; a heat insulating plate made of a heat insulating material and covering the external terminals and the bus bars from above; fastening members fastening the heat insulating plate to the power storage module; and a load bearing member provided at a position adjacent to the power storage module and bearing a load input from above, the load bearing member having a load bearing surface for bearing the load at a position higher than the upper surface of the heat insulating plate, and the fastening members being located at a position higher than the upper surface of the heat insulating plate.

[0006] In addition, in the power storage device of the present utility model, it may be configured such that the upper surface of the fastening member is located at the same height position as the load bearing surface or at a height position higher than the load bearing surface.

[0007] In addition, in the power storage device of the present utility model, it may be configured such that the power storage module includes a pair of end plates arranged outside the plurality of power storage units in the arrangement direction of the plurality of power storage units, and the fastening members fasten the heat insulating plate to the end plates.

[0008] In addition, in the power storage device of the present utility model, it may be configured that the power storage device further includes: another power storage module disposed adjacent to the power storage module; and a voltage monitoring unit disposed between the power storage module and the another power storage module to monitor the voltage of at least one of the power storage module and the another power storage module. The load bearing member is located between the power storage module and the another power storage module and is disposed adjacent to the voltage monitoring unit, and the voltage monitoring unit is disposed between the fastening member and the load bearing member.

[0009] In addition, in the power storage device of the present utility model, it may be configured that the power storage device further includes a unit housing that houses the power storage module, the load bearing surface is disposed in the central region of the unit housing, and the fastening member is disposed in a region surrounding the central region.

[0010] According to the present utility model, it is possible to provide a power storage device capable of suppressing the transmission of a load input from above to a power storage unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 FIG. is a plan view schematically showing a power storage device according to an embodiment of the present utility model.

[0012] Figure 2 FIG. is a plan view schematically showing a part of a power storage module.

[0013] Figure 3 FIG. is a Figure 1 cross-sectional view taken along line III-III in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] Embodiments of the present utility model will be described with reference to the accompanying drawings. In the accompanying drawings referred to below, the same or corresponding components are denoted by the same reference numerals.

[0015] Figure 1 FIG. is a plan view schematically showing a power storage device according to an embodiment of the present utility model. Figure 2 FIG. is a plan view schematically showing a part of a power storage module. Figure 3 FIG. is a Figure 1 cross-sectional view taken along line III-III in. The power storage device 1 is mounted on a vehicle, for example.

[0016] As Figures 1 to 3 shown, the power storage device 1 includes at least one power storage module 100, a unit housing 200, at least one heat insulating plate 300, a plurality of fastening members 400, at least one load bearing member 500, and at least one voltage monitoring unit 600.

[0017] As Figure 1As shown, the power storage device 1 includes a plurality of power storage modules 100. In the present 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) when viewed from above. A part of the plurality of power storage modules 100 is arranged at intervals in a direction (the second direction) orthogonal to the one direction.

[0018] As Figure 1 and Figure 2 shown, 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.

[0019] The plurality of power storage cells 110 are arranged in the first direction. As each power storage cell 110, for example, a lithium-ion battery can be cited. In addition, each power storage cell 110 may also be constituted by an all-solid-state battery using a solid electrolyte. Each power storage cell 110 is formed in a flat rectangular parallelepiped shape.

[0020] As Figure 2 shown, each power storage cell 110 has a pair of external terminals 112 and an exhaust port 114. Each external terminal 112 and the exhaust port 114 are formed on the upper surface of the casing of the power storage cell 110. The exhaust port 114 is a valve for discharging waste smoke gas generated inside the casing. The exhaust port 114 is provided between the pair of external terminals 112 in the second direction. In addition, the waste smoke gas may contain electrolyte or metal pieces, etc.

[0021] 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 connected in series electrically.

[0022] The unit casing 200 houses the power storage module 100. As Figure 3 shown, the unit casing 200 has a lower casing 210 and an upper cover 220. In addition, the illustration of the upper cover 220 is omitted Figure 1 here.

[0023] The lower casing 210 houses the plurality of power storage modules 100 and is open at the top. As Figure 1 and Figure 3 shown, the lower casing 210 has a bottom wall 212, a peripheral wall 214, and a plurality of cross beams 216.

[0024] The bottom wall 212 supports the plurality of power storage modules 100. The bottom wall 212 may also be formed in a flat plate shape.

[0025] The peripheral wall 214 stands up from the peripheral edge of the bottom wall 212. The peripheral wall 214 centrally surrounds the plurality of power storage modules 100.

[0026] A plurality of cross beams 216 are arranged at intervals in a direction (the second direction) orthogonal to the length direction of each power storage module 100. Each cross beam 216 extends along the length direction (the first direction) of the power storage module 100. Each cross beam 216 separates the power storage modules 100 adjacent to each other in the second direction. The end portions of each cross beam 216 are connected to the peripheral wall 214. As Figure 3 shown, the upper surface of each cross beam 216 is located at a position lower than the upper surface of each power storage module 100.

[0027] The upper cover 220 covers the plurality of power storage modules 100. The upper cover 220 is open at the bottom. The upper cover 220 and the lower housing 210 house the power storage module 100 together. As Figure 3 shown, the upper cover 220 has a top wall 222 located above the plurality of power storage modules 100. The top wall 222 may also be formed in a flat plate shape.

[0028] Each heat insulating plate 300 is made of a heat insulating material and is disposed on the power storage module 100. As the heat insulating material, for example, mica obtained by thermocompression curing of natural inorganic minerals can be cited. Each heat insulating plate 300 covers the external terminal 112 and the bus bar 130 from above. Each heat insulating plate 300 may also be formed in a flat plate shape. As Figure 1 and Figure 3 shown, the outer shape of each heat insulating plate 300 in plan view is the same as the outer shape of each power storage module 100 in plan view. However, the outer shape of each heat insulating plate 300 may be slightly smaller or slightly larger than the outer shape of each power storage module 100.

[0029] Each fastening member 400 fastens the heat insulating plate 300 to the power storage module 100. Specifically, each fastening member 400 fastens the heat insulating plate 300 to the end plate 120. As Figure 2 shown, insertion holes 120h for inserting the fastening members 400 are formed on the upper surface of the end plate 120. As Figure 3 shown, the fastening member 400 is located at a position higher than the upper surface of the heat insulating plate 300. As Figure 1 and Figure 3 shown, each fastening member 400 is disposed in the peripheral region of the unit housing 200.

[0030] The power storage device 1 includes a plurality of load bearing members 500. In the present embodiment, the power storage device 1 includes five load bearing members 500. However, the number of load bearing members 500 is not limited to five.

[0031] Each load bearing member 500 is disposed at a position adjacent to the power storage module 100. As Figure 3As shown, each load-bearing component 500 is fixed to the cross beam 216. Each load-bearing component 500 bears the load input to the power storage device 1 from above. Specifically, each load-bearing component 500 transfers the load input to the top wall 222 of the power storage device 1 to the bottom wall 212 via the cross beam 216.

[0032] Each load-bearing component 500 has a pair of load-bearing surfaces 510 that bear loads respectively. The pair of load-bearing surfaces 510 are disposed at positions separated from each other in the first direction. As Figure 1 shown, one of the pair of load-bearing surfaces 510 is disposed at a position overlapping with one of the pair of power storage modules 100 adjacent to each other in the first direction in the second direction, and the other of the pair of load-bearing surfaces 510 is disposed at a position overlapping with the other of the pair of power storage modules 100 adjacent to each other in the first direction in the second direction. As Figure 3 shown, each load-bearing surface 510 is located at a position higher than the upper surface of the heat insulating plate 300. As Figure 1 and Figure 3 shown, the load-bearing surfaces 510 of each load-bearing component 500 are disposed in the central region of the unit housing 200. In other words, each fastening component 400 is disposed in the region surrounding the central region where each load-bearing surface 510 is disposed. The upper surface of each fastening component 400 is located at the same height position as or higher than the load-bearing surface 510.

[0033] The power storage device 1 includes a plurality of voltage monitoring units 600. In the present embodiment, the power storage device 1 includes 5 voltage monitoring units 600. However, the number of voltage monitoring units 600 is not limited to 5.

[0034] Each voltage monitoring unit 600 is disposed between a pair of power storage modules 100 adjacent to each other in the second direction. As Figure 3 shown, each voltage monitoring unit 600 is fixed to the cross beam 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 beside the load-bearing component 500.

[0035] As described above, in the power storage device 1 of the present embodiment, since the load from above is borne by the load-bearing surfaces 510 of the load-bearing components 500 and the above load is also borne by the fastening components 400, the transfer of the above load to the power storage unit 110 is suppressed.

[0036] Those skilled in the art should understand that the above exemplary embodiments are specific examples of the following manner.

[0037] The first mode is an electricity storage device, which has: an electricity storage module including a plurality of electricity storage units each having an external terminal; a bus bar connecting the external terminals of the plurality of electricity storage units to each other; 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 electricity storage module; and a load bearing member disposed adjacent to the electricity storage module and bearing a load input from above, the load bearing member having a load bearing surface for bearing the load at a position higher than the upper surface of the heat insulating plate, and the fastening member being located at a position higher than the upper surface of the heat insulating plate.

[0038] In this electricity storage device, since the load from above is borne by the load bearing surface of the load bearing member and is also borne by the fastening member, the transfer of the above load to the electricity storage module can be suppressed.

[0039] The second mode is the electricity storage device according to the first mode, wherein the upper surface of the fastening member is located at the same height position as or higher than the load bearing surface.

[0040] The third mode is the electricity storage device according to the first mode or the second mode, wherein the electricity storage module includes a pair of end plates disposed outside the plurality of electricity storage units in the arrangement direction of the plurality of electricity storage units, and the fastening member fastens the heat insulating plate to the end plates.

[0041] In this mode, since the load from above is transmitted to the end plates, the transfer of the above load to the electricity storage units can be more reliably suppressed.

[0042] The fourth mode is the electricity storage device according to any one of the first to third modes, wherein the electricity storage device further has: another electricity storage module disposed adjacent to the electricity storage module; and a voltage monitoring unit disposed between the electricity storage module and the other electricity storage module and monitoring the voltage of at least one of the electricity storage module and the other electricity storage module, the load bearing member being located between the electricity storage module and the other electricity storage module and disposed adjacent to the voltage monitoring unit, and the voltage monitoring unit being disposed between the fastening member and the load bearing member.

[0043] The fifth mode is the electricity storage device according to any one of the first to fourth modes, wherein the electricity storage device further has a unit housing for housing the electricity storage module, the load bearing surface is provided in a central region of the unit housing, and the fastening member is provided in a region around the central region.

[0044] In addition, the embodiments disclosed herein are illustrative in all aspects and should be considered non-restrictive. The scope of the present utility model is shown not by the description of the above embodiments but by the claims, and also includes all modifications within the meaning and scope equivalent to the claims.

Claims

1. A power storage device, characterized in that: have: A power storage module including a plurality of power storage units each having an external terminal; a bus bar connecting the external terminals of the plurality of power storage units to each other; A heat-insulating plate, made of a heat-insulating material, covering the external terminal and the busbar from above; A fastening component, fastening the heat insulation plate to the power storage module; and The load receiving member is disposed adjacent to the power storage module and receives the 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 an upper surface of the heat insulating plate.

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

3. The power storage device according to claim 1 or 2, characterized in that: The power storage module includes a pair of end plates, the pair of end plates being arranged outside the plurality of power storage cells in the arrangement direction of the plurality of power storage cells, The fastening member fastens the insulation board to the end plate.

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

5. The power storage device according to claim 1, wherein: The power storage device further includes a unit case for accommodating the power storage module. The load bearing surface is arranged in the central area of ​​the unit housing. The fastening member is provided in a region surrounding the central region.

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