JP2021118087A - Power storage module and manufacturing method thereof - Google Patents

Abstract

To provide a power storage module and a manufacturing method thereof which do not easily deteriorate the joining quality at a joining portion between joining protrusions.SOLUTION: A power storage module 2 includes a module body 11 with a through hole 16b, and a pressure adjusting valve 12 having a housing 60 in which the through hole 33 corresponding to the through hole 16b is formed, and that is attached to the module body 11, and the module body 11 includes a joining protrusion 27 that forms a frame shape surrounding the through hole 16b and projects toward the pressure adjusting valve 12, and the pressure adjusting valve 12 includes a joining protrusion 34 that forms a frame shape surrounding the through hole 33 on the outer surface of the housing 60 and projects toward module body 11, and the width W1 of the joining protrusion 27 is larger than the width W2 of the joining protrusion 34, and the joining protrusion 27 and the joining protrusion 34 are joined such that the through hole 16b and the through hole 33 communicate with each other.SELECTED DRAWING: Figure 11

Description

The present invention relates to a power storage module and a method for manufacturing the power storage module.

The power storage module described in Patent Document 1 is known. This power storage module includes a module main body and a pressure adjusting valve attached to the module main body and discharging gas from the internal space to the outside when the internal pressure of the module main body exceeds a set value. The module body and the pressure regulating valve are each provided with a protrusion for joining. By joining the joining protrusions of the module body and the joining protrusions of the pressure regulating valve to each other, a flow path for gas from the internal space of the module body to flow to the pressure regulating valve is formed.

Japanese Unexamined Patent Publication No. 2019-133875

In a configuration in which the bonding protrusions of the module body and the bonding protrusions of the pressure regulating valve are joined to each other as in the above-mentioned power storage module, there is a possibility that misalignment may occur such that the joining protrusions may be poorly joined at the time of joining. There is. If a joint failure occurs, the strength of the joint portion decreases, and the joint portion may be damaged when the internal pressure of the module body rises.

One aspect of the present invention is to provide a power storage module and a method for manufacturing a power storage module that suppress the occurrence of misalignment at a joint portion between bonding protrusions.

The power storage module according to one aspect of the present invention includes a module main body having a plurality of internal spaces and a plurality of first communication holes communicated with each of the plurality of internal spaces, and a plurality of storage modules corresponding to the plurality of first communication holes. A housing in which the second communication hole is formed, and a pressure adjusting valve having a plurality of elastic valve bodies that close each of the plurality of second communication holes in the housing and attached to the module body. The module body includes a first joining protrusion that forms a frame shape surrounding each of the plurality of first communication holes and projects toward the pressure regulating valve, and the pressure regulating valve has a plurality of second communication on the outer surface of the housing. It includes a second joining protrusion that forms a frame shape surrounding each hole and protrudes toward the module body, and the width of the first joining protrusion is larger than the width of the second joining protrusion. The second connecting protrusion is joined so that each of the plurality of first communication holes and each of the corresponding plurality of second communication holes communicate with each other.

In the above-mentioned power storage module, the width of the first joining protrusion provided on the module body is formed to be larger than the width of the second joining protrusion provided on the pressure regulating valve, so that the first joining protrusion and the second Occurrence of misalignment with the bonding protrusion is suppressed. Therefore, it is possible to prevent defects from occurring in the joint portion between the first joint protrusion and the second joint protrusion.

The housing has a rectangular plate-like shape having a longitudinal direction and a width direction, and a bottom wall in which a plurality of second communication holes are formed, and a plurality of second joining protrusions formed in the bottom wall so as to be separated from each other in the longitudinal direction. A plurality of cylinders protruding from the bottom wall to the opposite side of the module body and accommodating each of the plurality of elastic valve bodies, and a frame-shaped outer wall connected to the periphery of the bottom wall and surrounding the plurality of cylinders. A case comprising, and a cover fixed to the outer peripheral wall so as to face the bottom wall, the housing comprises, in at least a portion of the area between the plurality of second joining projections in the longitudinal direction. It may be formed only by the bottom wall, the outer peripheral wall and the cover. In this configuration, a structure such as a cylinder is not formed in the housing in the region between the plurality of second joining protrusions. In this case, the region between the plurality of second joining protrusions is more easily deformed than the region where the second joining protrusions are formed. Therefore, even when the bottom wall of the pressure adjusting valve is warped, it is easy to adjust the position of the second joining protrusion with respect to the first joining protrusion.

The housing has a rectangular plate shape having a longitudinal direction and a width direction, and has a bottom wall in which a plurality of second communication holes are formed and a plurality of second joints formed in the bottom wall so as to be separated from each other in the longitudinal direction. A frame-shaped outer wall that projects from the bottom wall to the opposite side of the module body and accommodates each of the plurality of elastic valve bodies, and a frame-shaped outer wall that is connected to the periphery of the bottom wall and surrounds the plurality of cylinders. The housing comprises, including, and a cover fixed to the outer peripheral wall so as to face the bottom wall, the housing in at least a portion of the area between the plurality of second joining projections in the longitudinal direction. , It may be formed only by the bottom wall and the outer peripheral wall. In this configuration, in the region between the plurality of second joining protrusions, the housing is formed only by the bottom wall and the outer peripheral wall, and no structure such as a cylinder is formed in the housing. In this case, the region between the plurality of second joining protrusions is more easily deformed than the region where the second joining protrusions are formed. Therefore, even when the bottom wall of the pressure adjusting valve is warped, it is easy to adjust the position of the second joining protrusion with respect to the first joining protrusion.

Slits may be formed in the outer peripheral wall in at least a part of the region between the plurality of second joining protrusions in the housing. In this case, the region between the plurality of second joining protrusions is more easily deformed than the region where the second joining protrusions are formed. Therefore, even when the bottom wall of the pressure adjusting valve is warped, it is easy to adjust the position of the second joining protrusion with respect to the first joining protrusion.

The method for manufacturing a power storage module according to one aspect of the present invention includes a module body having a plurality of internal spaces and a plurality of first communication holes communicated with each of the plurality of internal spaces, and a plurality of first communication holes, respectively. It has a housing in which a plurality of corresponding second communication holes are formed, and a plurality of elastic valve bodies that close each of the plurality of second communication holes in the housing, and a pressure adjusting valve attached to the module body. A method for manufacturing a power storage module including The pressure regulating valve includes a first joining protrusion that forms a frame shape that surrounds each hole and projects toward the pressure regulating valve, and the pressure regulating valve is a module that forms a frame shape that surrounds a plurality of second communication holes on the outer surface of the housing. The width of the first joining protrusion is larger than the width of the second joining protrusion, including the second joining protrusion that protrudes toward the main body and faces the first joining protrusion. The first joining protrusion and the second joining protrusion and the second joining protrusion are in a molten state so that each of the plurality of first communication holes and the corresponding second communication holes communicate with each other. Join with the joining protrusion.

In the above-mentioned manufacturing method of the power storage module, the width of the first joining protrusion provided on the module body is formed to be larger than the width of the second joining protrusion provided on the pressure regulating valve, so that the first joining protrusion is formed. High precision is not required for the alignment between the and the second bonding protrusion. Therefore, it is possible to prevent defects from occurring in the joint portion between the first joint protrusion and the second joint protrusion, and it is easy to maintain the joint quality. Further, since the width of the first joining protrusion provided on the module main body is formed to be large, the amount of heat input to the second joining protrusion provided on the pressure adjusting valve in the joining step is determined by the first joining protrusion. Is less than the amount of heat input to. Therefore, the influence of heat input on the elastic member of the pressure regulating valve can be suppressed.

According to one aspect of the present invention, it is possible to provide a power storage module and a method for manufacturing a power storage module, which does not easily deteriorate the joint quality at the joint portion between the joint protrusions.

It is schematic cross-sectional view which shows the power storage device which includes the power storage module of one example. It is the schematic sectional drawing of the power storage module of one example. It is a schematic perspective view of an example power storage module. It is an exploded perspective view which shows a part of the power storage module of one example. It is a figure which shows the mounting area formed in the module main body of one example. It is an exploded perspective view of an example pressure control valve. It is the bottom view of the pressure control valve of one example. It is a side view of an example case. It is sectional drawing of an example pressure control valve. It is a side view of an example cover. It is a figure for demonstrating the joining process of a pressure regulating valve and a power storage module. It is a figure for demonstrating the joining process of a pressure regulating valve and a power storage module. It is a figure for demonstrating the joining process of a pressure regulating valve and a power storage module. It is a top view which shows an example pressure control valve.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and duplicate description is omitted. In the figure, the XYZ Cartesian coordinate system is shown as needed. The Z-axis direction is, for example, the vertical direction, and the X-axis direction and the Y-axis direction are, for example, the horizontal direction.

FIG. 1 is a schematic cross-sectional view showing an example of a power storage device including a power storage module according to the present embodiment. The power storage device 1 shown in FIG. 1 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 1 includes a module stack 4 including a plurality of stacked power storage modules 2 and a restraint member 3 that applies a restraint load to the module stack 4 in the stacking direction D of the module stack 4. ..

The module laminate 4 includes a plurality of (here, four) power storage modules 2 and a plurality of (here, three) conductive plates 5. The power storage module 2 is a bipolar battery and has a rectangular shape when viewed from the stacking direction D. The power storage module 2 is, for example, a secondary battery such as a nickel hydrogen secondary battery or a lithium ion secondary battery, or an electric double layer capacitor. In the following description, a nickel-metal hydride secondary battery will be illustrated.

The power storage modules 2 adjacent to each other in the stacking direction D are electrically connected in series via a conductive plate 5. A conductive plate P electrically connected to the power storage module 2 and an insulating plate F are laminated in this order at both ends of the module stacking body 4 in the stacking direction D. A positive electrode terminal 6 is connected to one conductive plate P, and a negative electrode terminal 7 is connected to the other conductive plate P. The positive electrode terminal 6 and the negative electrode terminal 7 are drawn out from the edge of the conductive plate P, for example, in a direction intersecting the stacking direction D. The power storage device 1 is charged and discharged via the positive electrode terminal 6 and the negative electrode terminal 7.

Inside the conductive plate 5 arranged between the power storage modules 2, a plurality of flow paths 5a through which a cooling medium such as air is circulated are provided. The flow path 5a extends along a direction that intersects (orthogonally), for example, the stacking direction D and the pull-out direction of the positive electrode terminal 6 and the negative electrode terminal 7. The conductive plate 5 has a function as a connecting member that electrically connects the power storage modules 2 to each other. Further, the conductive plate 5 also has a function as a heat radiating plate that dissipates heat generated by the power storage module 2 by circulating a cooling medium through these flow paths 5a. In the example of FIG. 1, the area of the conductive plate 5 seen from the stacking direction D is smaller than the area of the power storage module 2 seen from the stacking direction D, but from the viewpoint of improving heat dissipation, the conductive plate 5 The area may be the same as the area of the power storage module 2 or may be larger than the area of the power storage module 2.

The restraint member 3 is composed of a pair of end plates 8 that sandwich the module laminate 4 in the stacking direction D, and fastening bolts 9 and nuts 10 that fasten the end plates 8 to each other. The end plate 8 is a rectangular metal plate having an area one size larger than the areas of the power storage module 2, the conductive plate 5, and the conductive plate P as viewed from the stacking direction D. Since an insulating plate F having electrical insulation is provided between each end plate 8 and the conductive plate P, the insulating plate F insulates between the end plate 8 and the conductive plate P. ..

An insertion hole 8a is provided at the edge of the end plate 8 at a position outside the module laminate 4 when viewed from the stacking direction D (a position where it does not overlap with the module laminate 4 when viewed from the stacking direction D). .. The fastening bolt 9 is passed from the insertion hole 8a of one end plate 8 toward the insertion hole 8a of the other end plate 8. A nut 10 is screwed into the tip portion of the fastening bolt 9 protruding from the insertion hole 8a of the other end plate 8. As a result, the power storage module 2, the conductive plate 5, and the conductive plate P are sandwiched by the end plates 8 and unitized as the module laminate 4. Further, a restraining load is applied to the module laminated body 4 in the stacking direction D.

Next, the configuration of the power storage module 2 will be described in detail. FIG. 2 is a schematic cross-sectional view showing the internal configuration of the power storage module. FIG. 3 is a schematic perspective view of the power storage module. In FIGS. 2 and 3, the power storage module 2 has a structure (plural cell structure) in which a plurality of cells (for example, 24 cells) are laminated in the stacking direction D. The "cell" is the smallest unit constituting the battery, and has an internal space in which a positive electrode, a negative electrode, a separator, and an electrolytic solution are housed. In one example, one cell can be configured by accommodating one positive electrode, one negative electrode, a separator arranged between the positive electrode and the negative electrode, and an electrolytic solution in the internal space. One cell may be formed by accommodating a plurality of positive electrodes, a plurality of negative electrodes, a plurality of separators, and an electrolytic solution in the internal space. Further, the electrolytic solution is not limited to the liquid, and a solid electrolyte may be used. In this case, the solid electrolyte is accommodated between the positive electrode and the negative electrode, and the separator may not be provided.

The power storage module 2 includes a module main body 11 and a plurality of (here, four) pressure regulating valves 12 attached to the module main body 11. The module main body 11 includes an electrode laminated body 15 and a frame body 16 arranged so as to surround the electrode laminated body 15. The electrode laminate 15 includes a plurality of electrodes laminated along the stacking direction D of the power storage module 2 via the separator 14. The plurality of electrodes include a plurality of bipolar electrodes 13, a negative electrode terminal electrode 21, and a positive electrode terminal electrode 20.

The bipolar electrode 13 includes an electrode plate 17 including one surface 17a and the other surface 17b on the opposite side of the one surface 17a, a positive electrode active material layer 18 provided on the one surface 17a, and a negative electrode active material provided on the other surface 17b. It has a layer 19. The positive electrode active material layer 18 is formed by applying a positive electrode slurry containing a positive electrode active material to the electrode plate 17. Examples of the positive electrode active material include nickel hydroxide. The negative electrode active material layer 19 is formed by applying a negative electrode slurry containing a negative electrode active material to the electrode plate 17. Examples of the negative electrode active material include hydrogen storage alloys.

In the present embodiment, the formation region of the negative electrode active material layer 19 on the other surface 17b of the electrode plate 17 is slightly larger than the formation region of the positive electrode active material layer 18 on the one side surface 17a of the electrode plate 17. In the electrode laminate 15, the positive electrode active material layer 18 of one bipolar electrode 13 faces the negative electrode active material layer 19 of another bipolar electrode 13 adjacent to one of the stacking directions D with the separator 14 interposed therebetween. In the electrode laminate 15, the negative electrode active material layer 19 of one bipolar electrode 13 faces the positive electrode active material layer 18 of another bipolar electrode 13 adjacent to the other in the stacking direction D with the separator 14 interposed therebetween.

The negative electrode terminal electrode 21 has an electrode plate 17 and a negative electrode active material layer 19 provided on the other surface 17b of the electrode plate 17. The negative electrode terminal electrode 21 is arranged at one end of the stacking direction D so that the other surface 17b faces the center side of the stacking direction D in the electrode laminated body 15. One surface 17a of the electrode plate 17 of the negative electrode terminal electrode 21 constitutes one outer surface in the stacking direction D of the electrode laminate 15, and one conductive plate 5 or conductive plate P adjacent to the power storage module 2 (see FIG. 1). ) Is electrically connected. The negative electrode active material layer 19 provided on the other surface 17b of the electrode plate 17 of the negative electrode terminal electrode 21 faces the positive electrode active material layer 18 of the bipolar electrode 13 at one end in the stacking direction D via the separator 14.

The positive electrode terminal electrode 20 has an electrode plate 17 and a positive electrode active material layer 18 provided on one surface 17a of the electrode plate 17. The positive electrode terminal electrode 20 is arranged at the other end of the stacking direction D so that one surface 17a faces the center side of the stacking direction D in the electrode laminated body 15. The other surface 17b of the electrode plate 17 of the positive electrode terminal electrode 20 constitutes the other outer surface in the stacking direction D of the electrode laminate 15, and the other conductive plate 5 or the conductive plate P adjacent to the power storage module 2 (see FIG. 1). ) Is electrically connected. The positive electrode active material layer 18 provided on one surface 17a of the positive electrode terminal electrode 20 faces the negative electrode active material layer 19 of the bipolar electrode 13 at the other end in the stacking direction D via the separator 14.

The electrode plate 17 is a conductor having a plate shape extending in the horizontal direction and exhibits flexibility. Therefore, the horizontal direction can be said to be the extending direction of the electrode plate 17. The electrode plate 17 is, for example, a nickel foil, a plated steel plate, or a plated stainless steel plate. Examples of the steel sheet include cold-rolled steel sheets (SPCC and the like) specified in JIS G 3141: 2005. Examples of the stainless steel sheet include SUS304 specified in JIS G 4305: 2015. The thickness of the electrode plate 17 is, for example, 0.1 μm or more and 1000 μm or less. When the electrode plate 17 is a nickel foil, the nickel foil may be plated. The edge portion 17c of the electrode plate 17 (the edge portion of the bipolar electrode 13) has a rectangular frame shape, and is an uncoated region in which the positive electrode slurry and the negative electrode slurry are not coated.

The separator 14 is formed in a sheet shape, for example. Examples of the separator 14 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), a woven fabric made of polypropylene, methyl cellulose and the like, or a non-woven fabric. The separator 14 may be reinforced with a vinylidene fluoride resin compound.

The frame body 16 is, for example, a rectangular frame as a whole, and is made of an insulating resin. The frame body 16 is provided so as to surround the edge portion 17c of each electrode plate 17 and the side surface 15a of the electrode laminated body 15. The frame body 16 holds the edge portion 17c. The frame body 16 has a plurality of first sealing portions 22 coupled to the edge portion 17c of the electrode plate 17, and a second sealing portion 22 extending along the stacking direction D and coupled to each of the first sealing portions 22. It has a unit 23 and. The first sealing portion 22 and the second sealing portion 23 are made of an insulating resin having alkali resistance. Examples of the constituent materials of the first sealing portion 22 and the second sealing portion 23 include polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), and the like.

The first sealing portion 22 is continuously provided on one surface 17a of the electrode plate 17 over the entire circumference of the edge portion 17c, and has a rectangular frame shape when viewed from the stacking direction D. In the present embodiment, the first sealing portion 22 is provided not only on the electrode plate 17 of the bipolar electrode 13, but also on the electrode plate 17 of the negative electrode terminal 21 and the electrode plate 17 of the positive electrode 20. In the negative electrode terminal electrode 21, the first sealing portion 22 is provided on the edge 17c of the one surface 17a of the electrode plate 17, and in the positive electrode terminal 20, both edges of both the one surface 17a and the other surface 17b of the electrode plate 17 are provided. A first sealing portion 22 is provided on 17c.

The first sealing portion 22 is overlapped with the edge portion 17c of the electrode plate 17 to form an overlapping portion K. In the overlapping portion K, the first sealing portion 22 is airtightly welded to the electrode plate 17 by, for example, ultrasonic waves or thermocompression bonding. The first sealing portion 22 is formed by using, for example, a film having a predetermined thickness in the stacking direction D. The inner wall surface of the first sealing portion 22 is located between the edge portions 17c of the electrode plates 17 adjacent to each other in the stacking direction D (inside the side surface 15a of the electrode laminated body 15). The outer wall surface of the first sealing portion 22 projects outside the edge of the electrode plate 17 (outside the side surface 15a of the electrode laminate 15), and the tip portion thereof is held by the second sealing portion 23. ing. The first sealing portions 22 adjacent to each other along the stacking direction D may be separated from each other or may be in contact with each other. Further, the outer edge portions of the first sealing portion 22 may be bonded to each other by, for example, hot plate welding.

In the electrode laminate 15, the inner wall surface of the first sealing portion 22 located in the inner layer in the stacking direction D is provided with a step portion 22s for mounting the edge portion of the separator 14 protruding from the inner wall surface. .. The step portion 22s may be formed by folding back the outer edge portion of the film constituting the first sealing portion 22 inward. The step portion 22s may be formed by superimposing the film forming the upper stage on the film forming the lower stage. Further, in one example, in the electrode laminate 15, the first sealing portion 22 located on the outer layer in the stacking direction D (arranged at both ends of the electrode laminate 15 in the stacking direction D) has a step portion 22s. Although not, it may have a stepped portion 22s like the first sealing portion 22 located in the inner layer.

The second sealing portion 23 is provided outside the electrode laminated body 15 and the first sealing portion 22 in a direction orthogonal to the stacking direction D, and constitutes an outer wall of the power storage module 2. Further, the second sealing portion 23 covers a part of the outer wall surface of the first sealing portion 22 arranged at both ends of the electrode laminated body 15 in the stacking direction D. The second sealing portion 23 is formed, for example, by injection molding of a resin, and extends along the stacking direction D over the entire length of the electrode laminate 15. The second sealing portion 23 has a rectangular frame shape extending with the stacking direction D as the axial direction. The second sealing portion 23 is welded to the outer edge portion of the first sealing portion 22 by heat during injection molding, for example.

The second sealing portion 23 has overhang portions 23a that cover a part of the outer wall surface of the first sealing portion 22 arranged at both ends of the electrode laminated body 15 in the stacking direction D. One overhang portion 23a projects toward the inner edge side of the first sealing portion 22 at one end in the stacking direction D, and is welded to one surface 17a of the electrode plate 17 constituting the negative electrode terminal electrode 21. It is bound to 22. The other overhang portion 23a projects toward the inner edge side of the first sealing portion 22 at the other end of the stacking direction D, and is welded to the other surface 17b of the electrode plate 17 constituting the positive electrode terminal electrode 20. It is connected to the part 22. The overhang lengths of one and the other overhang portions 23a are equal to each other, and the tip surfaces 23b of these overhang portions 23a are formed between the electrode plate 17 and the first sealing portion 22 when viewed from the stacking direction D. It is located so as to overlap the overlapping portion K.

The first sealing portion 22 and the second sealing portion 23 form an internal space V between adjacent electrodes and seal the internal space V. More specifically, the second sealing portion 23, together with the first sealing portion 22, is between the bipolar electrodes 13 adjacent to each other along the stacking direction D, and the negative electrode terminal electrodes 21 adjacent to each other along the stacking direction D. And the bipolar electrode 13 and between the positive electrode terminal electrode 20 and the bipolar electrode 13 adjacent to each other along the stacking direction D are sealed. As a result, an airtightly partitioned internal space V is formed between the adjacent bipolar electrodes 13, between the negative electrode terminal 21 and the bipolar electrode 13, and between the positive electrode 20 and the bipolar electrode 13. ing. In the present embodiment, the space surrounded by one surface 17a of the electrode plate 17, the other surface 17b of one electrode plate 17 adjacent to the electrode plate 17, and the first sealing portion 22 is the internal space V. ing. The electrolytic solution is housed in this internal space V.

That is, the electrode plate 17 and the positive electrode active material layer 18 formed on one surface 17a of the electrode plate 17, one electrode plate 17 adjacent to the electrode plate 17, and the other surface 17b of the one electrode plate 17 are formed. One cell is composed of the negative electrode active material layer 19, the separator 14 arranged between the positive electrode active material layer 18 and the negative electrode active material layer 19, and the electrolytic solution. In other words, one cell has an internal space V sealed between adjacent electrodes by a first sealing portion 22 and a second sealing portion 23. Then, the positive electrode active material layer 18 formed on one surface 17a of the electrode plate 17, the negative electrode active material layer 19 formed on the other surface 17b of one electrode plate 17 adjacent to the electrode plate 17, and the positive electrode active material layer. The separator 14 arranged between the 18 and the negative electrode active material layer 19 and the electrolytic solution are housed in the internal space V. The electrolytic solution is an aqueous electrolytic solution containing an alkaline solution such as an aqueous potassium hydroxide solution. The electrolytic solution is impregnated in the separator 14, the positive electrode active material layer 18, and the negative electrode active material layer 19. The power storage module 2 includes a plurality of (24 in the illustrated example) internal spaces V arranged in order in the stacking direction D. That is, the power storage module 2 includes a plurality of cells (24 in the illustrated example) arranged in the stacking direction D.

The configuration of the pressure regulating valve 12, that is, the pressure regulating valve structure will be described with reference to FIGS. 4 to 10. FIG. 4 is an exploded perspective view showing a part of the power storage module of one example. FIG. 5 is a diagram showing a mounting area formed on the module body. FIG. 6 is an exploded perspective view showing an example pressure regulating valve. FIG. 7 is a bottom view of an example pressure regulating valve. FIG. 8 is a side view of a case constituting the pressure regulating valve. FIG. 9 is a cross-sectional view of an example pressure regulating valve. FIG. 10 is a side view of a cover constituting the pressure regulating valve.

As shown in FIGS. 3, 4 and 5, one wall portion 16a constituting the frame body 16 is provided with a plurality of (here, four) mounting areas 24 for mounting the pressure adjusting valve 12. ing. The wall portion 16a has a wall surface parallel to the stacking direction D. In one example, one pressure regulating valve 12 is mounted on two mounting regions 24 adjacent to each other in the Y direction. In each mounting region 24, the frame body 16 has a plurality of through holes (first communication holes) 16b penetrating to each of the plurality of internal spaces V (see FIG. 2). In FIG. 5, the through hole 16b formed in the mounting region 24 is omitted. Each mounting area 24 is provided with a plurality of (six in this case) through holes 16b. The through holes 16b are arranged in three rows and two stages (three rows in the Y direction and two stages in the Z direction) in each mounting region 24. Therefore, the through holes 16b are arranged in 12 rows and 2 steps on the wall portion 16a. Each through hole 16b communicates with the internal space V of a different cell.

Each through hole 16b includes a through hole 25 provided in the first sealing portion 22 and a through hole 26 provided in the second sealing portion 23. Each through hole 16b functions as a liquid injection hole for injecting an electrolytic solution into each internal space V. Further, each through hole 16b becomes a flow path through which a gas (for example, hydrogen gas) generated in each internal space V flows after the electrolytic solution is injected.

Each mounting region 24 of the second sealing portion 23 is provided with a substantially frame-shaped joining protrusion (first joining protrusion) 27 protruding from the wall surface of the wall portion 16a. The joining protrusion 27 joins the module main body 11 and the pressure regulating valve 12, and cooperates with the through hole 26 through a plurality of (six in this case) flow paths 28 through which gas from each internal space V flows. Form. Therefore, the flow paths 28 are arranged in three rows and two stages in each mounting region 24. The flow path 28 has a rectangular shape in a cross section along a plane perpendicular to the X direction. The joining protrusions 27 are formed in a grid pattern when viewed from the X direction, and have a wall body 27a extending in the Z direction and a wall body 27b extending in the Y direction.

As shown in FIGS. 4 and 6, the pressure regulating valve 12 includes a housing 60 including a case 29 and a cover 31, and a plurality of (12 in this case) valve bodies 30 housed in the housing 60. Have. The case 29 is made of a resin such as PP, PPS or modified PPE. The case 29 is formed in a substantially rectangular shape when viewed from the opposite direction in which the case 29 and the cover 31 face each other. The facing direction is the mounting direction of the pressure adjusting valve 12 with respect to the module main body 11 (wall portion 16a), and is also the compression direction of the valve body 30, which will be described later. The pressure regulating valve 12 is attached to the module body 11 in a direction perpendicular to the wall portion 16a. Therefore, the facing direction coincides with the X direction.

The case 29 has a rectangular plate-shaped bottom wall 32 having a longitudinal direction along the Y direction and a width direction along the Z direction. The bottom wall 32 has a plurality of (12 in this case) through holes (second) penetrating in the facing direction (X direction) from the outer wall surface 32a on the module body 11 side toward the inner wall surface 32b (wall surface) on the cover 31 side. (Communication hole) 33 is provided. These through holes 33 correspond to the through holes 16b of the module main body 11, respectively. That is, the through hole 33 and the through hole 16b form a communication hole 49 that communicates with the internal space V formed in the module main body 11. In other words, each of the through hole 33 and the through hole 16b constitutes a part of the communication hole 49. The through hole 33 corresponds to the outlet of the communication hole 49, and has a circular shape in a cross section along a plane (YZ plane) perpendicular to the X direction (see FIG. 7).

As shown in FIG. 7, the outer wall surface 32a of the bottom wall 32 is provided with a pair of substantially frame-shaped joining protrusions (second joining protrusions) 34 protruding from the outer wall surface 32a. The pair of joining protrusions 34 are formed so as to be separated in the Y direction at intervals corresponding to the pair of joining protrusions 27. The pair of joining protrusions 34 join the module body 11 and the pressure regulating valve 12, and form a plurality of (12 in this case) flow paths 35 through which gas from each internal space V flows. The joining protrusion 34 faces the joining protrusion 27 of the module main body 11 and is joined to the joining protrusion 27.

The joining protrusions 34 are formed in a grid pattern corresponding to the joining protrusions 27, and have a wall body 34a extending in the Z direction and a wall body 34b extending in the Y direction. As shown in FIGS. 5 and 7, the center line of the wall body 34a and the wall body 34b of the joining protrusion 34 (indicated by the alternate long and short dash line in FIG. 7) and the center of the wall body 27a and the wall body 27b of the joining protrusion 27. The lines (indicated by the alternate long and short dash lines in FIG. 5) have shapes that match each other when viewed from one direction in the X direction. Further, the width W1 of the joining protrusion 27 is formed to be larger than the width W2 of the joining protrusion 34. That is, the width W1a (that is, the size in the Y direction) of the wall body 27a of the joining protrusion 27 is formed to be larger than the width W2a (that is, the size in the Y direction) of the wall body 34a of the joining protrusion 34. The width W1b (that is, the size in the Z direction) of the wall body 27b of the joining protrusion 27 is formed to be larger than the width W2b (that is, the size in the Z direction) of the wall body 34b of the joining protrusion 34. In one example, the width W1a of the wall body 27a of the joining protrusion 27 and the width W1b of the wall body 27b may be the same. Further, the width W2a of the wall body 34a of the joining protrusion 34 and the width W2b of the wall body 34b may be the same. Further, in one example, the protrusion height of the joining protrusion 34 from the outer wall surface 32a (distance from the outer wall surface 32a in the X direction) is the protrusion height of the joining protrusion 27 from the wall surface (X direction). The distance between the wall surfaces of the wall portion 16a in the above) is the same, but the protrusion heights of the joining protrusion 34 and the joining protrusion 27 may be different.

As shown in FIGS. 4, 6 and 8, the case 29 has an outer peripheral wall 36 and a partition wall portion (cylinder body) 37 protruding from the bottom wall 32 to the opposite side of the module main body 11, respectively. In the present embodiment, the outer peripheral wall 36 and the partition wall portion 37 are integrally formed with the bottom wall 32. The outer peripheral wall 36 is erected on the edge of the inner wall surface 32b of the bottom wall 32 so as to collectively surround a plurality of (12 in this case) valve bodies 30. Specifically, the outer peripheral wall 36 is formed over the entire circumference of the outer peripheral edge portion of the bottom wall 32, and constitutes the outer wall of the case 29. More specifically, the outer peripheral wall 36 is formed in a substantially rectangular frame shape along the outer peripheral edge portion of the bottom wall 32 formed in a substantially rectangular shape when viewed from the opposite direction.

The partition wall portion 37 is erected with the inner wall surface 32b of the bottom wall 32 as the base end so as to cover the side surface 30c of each valve body 30. In one example, the partition wall portion 37 forms a substantially columnar storage space S1 in which each valve body 30 is housed. That is, the partition wall portion 37 has a tubular shape having a substantially circular cross section. The tubular shape may be any shape as long as it can form a substantially columnar space inside for accommodating the valve body 30 extending in the X direction, and each partition wall portion 37 is independently formed into a tubular shape. It doesn't have to be. In the present embodiment, the accommodation space S1 is formed by the partition wall portion 37 and a part of the outer peripheral wall 36 surrounding the side surface 30c of the valve body 30. Further, in the present embodiment, the partition wall portion 37 accommodating one valve body 30 and the partition wall portion 37 accommodating another valve body 30 arranged at a position adjacent to the one valve body 30 are integrally formed. It is formed. In this way, the partition walls 37 that accommodate the valve bodies 30 that are different from each other may have a shared portion. The outer peripheral surfaces of the partition walls 37 may be separated from each other, and may be further separated from the inner wall surface 36b of the outer peripheral wall 36.

In the present embodiment, the end surface 36a of the outer peripheral wall 36 on the cover 31 side is located at a higher position in the facing direction than the end surface 37a of the partition wall portion 37 on the cover 31 side with reference to the inner wall surface 32b of the bottom wall 32. Therefore, in a state where the cover 31 is fixed to the case 29, the cover 31 is in contact with the end surface 36a of the outer peripheral wall 36, while the cover 31 and the end surface 37a of the partition wall portion 37 are separated from each other. That is, a space S2 is formed between the cover 31 and the end surface 37a of the partition wall portion 37. The space S2 functions as a flow path for the gas that has flowed into the pressure regulating valve 12 from the internal space V.

The valve body 30 (elastic valve body) is housed in the storage space S1 so as to close the through hole 33. The valve body 30 is a columnar member formed of an elastic member such as rubber. The valve body 30 has a first end surface 30a that closes the through hole 33 on the inner wall surface 32b side of the bottom wall 32, a second end surface 30b that is located on the opposite side of the first end surface 30a, and the first end surface 30a and the second end surface. It has a side surface 30c that connects the 30b. The second end surface 30b is a pressed surface pressed by the cover 31. The valve body 30 closes the through hole 33 by being arranged in a state where the first end surface 30a is pressed against the inner wall surface 32b of the bottom wall 32. The valve body 30 opens and closes the through hole 33 according to the pressure of the internal space V. A gap G is provided between the side surface 30c of the valve body 30 and the inner wall surface 37b of the partition wall 37 or the inner wall surface 36b of the outer peripheral wall 36.

As shown in FIGS. 6 and 8, a protruding portion 38 for positioning the valve body 30 is formed on the inner wall surface 37b of the partition wall portion 37. The protruding portion 38 projects from the inner wall surface 37b of the partition wall portion 37 toward the inner circumference. That is, the protruding portion 38 protrudes from the inner wall surface 37b toward the center of the accommodation space S1. The protruding portion 38 is provided over the entire inner wall surface 37b of the partition wall portion 37 along the extending direction (X-axis direction) of the central axis of the through hole 33. The protrusion 38 is formed so as to come into contact with the side surface 30c of the valve body 30. When the protruding portion 38 comes into contact with the valve body 30, the central position of the valve body 30 and the central axis of the through hole 33 can coincide with each other. With such a protruding portion 38, the misalignment of the valve body 30 can be suppressed within a certain range. In the present embodiment, a plurality of (six in this case) protrusions 38 are formed at equal pitches around the central axis of the through hole 33. In the illustrated example, six protrusions including two protrusions 38 formed on a line along the Z axis passing through the center of the through hole 33 (that is, the 6 o'clock position and the 12 o'clock position) when viewed from the X direction. The portions 38 are arranged at a pitch of 60 °.

As shown in FIG. 8, in the accommodation space S1, the inner wall surface 32b of the bottom wall 32 is formed with a seal portion (projection) 39 projecting from the inner wall surface 32b. The seal portion 39 is in contact with the first end surface 30a of the valve body 30 pressed against the seal portion 39, thereby closing the gap between the through hole 33 and the gap G so as to be openable and closable. The seal portion 39 is formed so as to surround the open end of the through hole 33 on the inner wall surface 32b. The seal portion 39 is formed in an annular shape centered on the central axis of the through hole 33 along the edge portion of the through hole 33. The seal portion 39 is formed so as to surround the entire circumference of the through hole 33 without a gap. As a result, the seal portion 39 is in close contact with the first end surface 30a of the valve body 30 without a gap, and airtightness is ensured.

The seal portion 39 is surrounded by the partition wall portion 37 when viewed from the opposite direction. Further, the plurality of seal portions 39 are collectively surrounded by the outer peripheral wall 36. In one example, as described above, since one pressure regulating valve 12 is attached to the two attachment regions 24, the plurality of seal portions 39 correspond to the pair of joining protrusions 34 and are Y. It is divided into one side and the other side from the center of the direction. The partition wall portion 37 surrounding the seal portion 39 arranged on one side from the center in the Y direction and the partition wall portion 37 surrounding the seal portion 39 arranged on the other side are separated from each other in the center in the Y direction.

Further, in the plurality of through holes 33, the through holes 33 formed below the center in the Z direction and the through holes 33 formed above the center of the bottom wall 32 are alternately arranged along the Y direction. .. Therefore, the positions of the seal portions 39 adjacent to each other in the Y direction are deviated from each other in the Z direction. Further, the plurality of partition wall portions 37 are arranged at positions displaced from each other in the Y direction (left-right direction).

Further, as shown in FIG. 9, in at least a part of the region R between the one bonding protrusion 34 and the other bonding projection in the Y direction, only the bottom wall 32, the outer peripheral wall 36, and the cover 31 are used. The housing is configured. That is, in the Y direction, a region R in which the partition wall portion 37 is not formed is formed between the one joining protrusion 34 and the other joining protrusion 34. In the Y direction, the position of the exhaust port 41 overlaps with the position of the region R.

As shown in FIGS. 6 and 8, the case 29 is formed with a joining wall portion 40 that is welded (joined) to the edge portion of the cover 31 along a pair of notches 31a formed in the cover 31. Has been done. The joining wall portion 40 of the example is formed at one diagonal position when viewed from the opposite direction. The joining wall portion 40 is integrally formed with the outer peripheral wall 36. The end surface 40a on the cover 31 side of the joining wall portion 40 is formed on the same plane as the end surface 36a of the outer peripheral wall 36.

The cover 31 is a plate-shaped member that closes the opening of the case 29 while facing the bottom wall 32. The cover 31 is made of a resin such as PP, PPS or modified PPE. In one example, the cover 31 can be manufactured by injection molding. As shown in FIG. 10, the cover 31 is formed with a pair of notches 31a corresponding to the joining wall portion 40 of the case 29. When viewed from the opposite direction, the position of the outer peripheral edge portion of the cover 31 other than the edge portion along the notch 31a substantially coincides with the position of the outer peripheral edge portion (outer edge portion of the outer peripheral wall 36) of the case 29. ing.

The cover 31 is joined to the open end surface of the case 29 by welding. Specifically, of the edge portion 42 of the cover 31, the portion along the notch 31a is welded to the end surface 40a of the joining wall portion 40, and the portion along the notch 31a is the outer peripheral wall 36. It is welded to the end face 36a of. The edge 42 of the cover 31 is joined to the open end face of the case 29 by, for example, ultrasonic welding.

The cover 31 is provided with an exhaust port 41 for exhausting the gas inside the pressure regulating valve 12 to the outside of the pressure regulating valve 12. In the present embodiment, as an example, a rectangular exhaust port 41 is provided in the center of the cover 31 in the Y direction. The exhaust port 41 is arranged so as not to overlap the valve body 30 when viewed from the opposite direction. The exhaust port 41 is formed, for example, in a rectangular shape when viewed from the opposite direction.

The cover 31 has a flat inner surface 43 that presses the second end surface 30b of the valve body 30. Each valve body 30 is compressed by the inner surface 43 toward the corresponding seal portion 39. In one example, the inner surface 43 of the cover 31 may be a range surrounded by the edge 42 of the cover 31. In the cover 31, a reinforcing portion 50 for reinforcing the cover 31 is formed on the outer surface 45 opposite to the inner surface 43. The reinforcing portion 50 of one example is formed by partially thickening the cover 31. In the illustrated example, a plurality of reinforcing portions 51 extending in the Z direction (first direction) and a pair of reinforcing portions 52 extending in the Y direction (second direction) are shown. Further, in the illustrated example, the reinforcing portion 53 is formed along the notch 31a.

When manufacturing the power storage module 2 as described above, first, a step of preparing the module main body 11 and the pressure regulating valve 12 is carried out. Subsequently, a step of joining the module main body 11 and the pressure regulating valve 12 by hot plate welding, which is one of heat welding, is carried out. Specifically, first, as shown in FIG. 11, the module main body 11 and the pressure adjusting valve 12 are arranged so that the joining protrusion 27 and the joining protrusion 34 face each other, and the module main body 11 and the pressure adjusting valve 12 are arranged. A hot plate 46 is arranged between the and. In the manufacturing method of one example, the center position of the wall body 27a of the joining protrusion 27 and the center position of the wall body 34a of the joining protrusion 34 coincide with each other in the Y direction, and the wall body of the joining protrusion 27 in the Z direction. The module body 11 and the pressure regulating valve 12 may be arranged so that the center position of the 27b and the center position of the wall body 34b of the joining protrusion 34 coincide with each other. In FIG. 11, the central position in the Z direction is indicated by a alternate long and short dash line. Subsequently, the bonding protrusions 27 and 34 are melted by the hot plate 46. Then, as shown in FIG. 12, while the joining protrusions 27 and 34 are melted, the joining protrusion 27 of the module main body 11 and the joining protrusion 34 of the pressure adjusting valve 12 are pressed against each other for joining. The protrusions 27 and 34 are welded together. As a result, the joining protrusions 27 and 38 are joined to each other. That is, the module body 11 and the pressure regulating valve 12 are joined. In this case, as shown in FIG. 13, the joining protrusions 27 and 34 are pressed against each other, so that the tip 27c of the joining protrusion 27 and the tip 34c of the joining protrusion 34 intersect in the X direction ( It may spread in the YZ plane direction).

In the power storage module 2 described above, the second end surface 30b of each of the plurality of valve bodies 30 is pressed by the cover 31, so that the first end surface 30a becomes a seal portion 39 surrounding the through hole 33 (communication hole 49). Contact. As a result, the first end surface 30a of the valve body 30 and the seal portion 39 are brought into close contact with each other, and the respective through holes 33 can be closed by the corresponding valve body 30. The through hole 33 of the case 29 communicates with the internal space V of the module main body 11 through the through hole 26 of the second sealing portion 23 and the through hole 25 of the first sealing portion 22. When the pressure in the internal space V is lower than the set pressure, the through hole 33 is maintained in a closed state in which the valve body 30 closes. When the pressure in the internal space V rises to exceed the set pressure, the valve body 30 is elastically deformed so as to be separated from the bottom wall 32, and the valve opening state in which the through hole 33 is released is released. As a result, the gas from the internal space V is formed between the partition wall portion 37 and the cover 31 via the gap G (accommodation space S1) between the side surface 30c of the valve body 30 and the inner wall surface 37b of the partition wall portion 37. It is distributed to the space S2. Then, the gas is exhausted from the space S2 to the outside of the pressure adjusting valve 12 through the exhaust port 41.

In this power storage module 2, the width W1 of the joining protrusion 27 provided on the module main body 11 is formed to be larger than the width W2 of the joining protrusion 34 provided on the pressure regulating valve 12, so that the joining protrusion 27 is formed. Occurrence of misalignment with the joining protrusion 34 is suppressed. In this case, the misalignment does not mean that the center positions of the joining protrusions 27 and 34 are simply displaced from each other when viewed from the opposite direction, but the joining protrusion 27 is the joining protrusion 34 when viewed from the opposite direction. It means that they are joined outside the range.

As described above, the power storage module 2 does not require high accuracy in aligning the bonding projection 27 and the bonding projection 34. Therefore, it is possible to prevent defects from occurring in the joint portion between the joining protrusion 27 and the joining protrusion 34. Further, since the width of the joining protrusion 27 provided on the module main body 11 is formed to be large, the amount of heat input to the joining protrusion 34 provided on the pressure adjusting valve 12 is relative to the joining protrusion 27 in the joining step. It is smaller than the amount of heat input. For example, if the amount of heat input to the joining protrusion 34 becomes large, the valve body 30 may deteriorate due to the influence of heat. When the valve body 30 deteriorates, the valve opening pressure of the pressure adjusting valve 12 changes from the set pressure, and the pressure in the internal space V becomes less than the set pressure to open the valve, or the pressure in the internal space V becomes equal to or higher than the set pressure. However, in the present embodiment, the influence of heat input on the valve body 30 of the pressure regulating valve 12 can be suppressed.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment.

For example, FIG. 14 is a plan view showing another example of a pressure regulating valve that can be used in place of the pressure regulating valve 12. As shown in FIG. 14, the pressure regulating valve 112 has a housing 160 composed of a case 129 and a plurality of (two in the illustrated example) covers 131. The basic configuration of the case 129 is the same as that of the case 29. That is, the case 129 includes a partition wall portion 37, a seal portion 39, and the like (not shown), and accommodates a plurality of valve bodies 30. The case 129 has an outer peripheral wall 136 instead of the outer peripheral wall 36. Like the outer peripheral wall 36, the outer peripheral wall 136 is erected at the edge of the bottom wall 32 so as to collectively surround the plurality of valve bodies 30. The outer peripheral wall 136 has a slit 136s extending from the center of the outer peripheral wall 136 in the X direction to the end opposite to the bottom wall 32 at the center of the bottom wall 32 in the Y direction. In other words, the outer peripheral wall 136 has slits 136s recessed from the end opposite to the bottom wall 32 of the outer peripheral wall 136 toward the bottom wall 32. The slit 136s is formed at a position overlapping the region R between the one joining protrusion 34 and the other joining protrusion 34 in the Y direction. The two covers 131 are fixed to the outer peripheral wall 36 so as to press the valve body 30 corresponding to one joining protrusion 34 and the valve body 30 corresponding to the other joining protrusion 34, respectively. One cover 131 and the other cover 131 are separated from each other in the region R. That is, in at least a part of the region R, the housing 160 is composed of only the bottom wall 32 and the outer peripheral wall 136, and the slit 136s is formed in the outer peripheral wall 136. The slit 136s functions as an exhaust port of the pressure adjusting valve 112.

In the pressure regulating valve illustrated in FIG. 14, a structure such as a partition wall portion 37 is not formed in the housing 160. In this case, the region R between the plurality of joining protrusions 34 is more easily deformed than the region where the joining protrusions 34 are formed. Therefore, even when the bottom wall 32 of the pressure adjusting valve 112 is warped, the position of the joining protrusion 34 with respect to the joining protrusion 27 can be easily adjusted.

Further, in the region R of the housing 160, notch-shaped slits 136s are formed in the outer peripheral wall 136. In this case, the region R between the plurality of joining protrusions 34 is more easily deformed than the region where the joining protrusions 34 are formed. Therefore, even when the bottom wall 32 of the pressure adjusting valve 112 is warped, the position of the joining protrusion 34 with respect to the joining protrusion 27 can be easily adjusted. The width of the slit 136s in the Y direction is not particularly limited as long as it is smaller than the size of the region R in the Y direction, but the larger the width of the slit 136s in the Y direction, the easier it is for the region R to be deformed. Further, although one slit 136s is provided in this example, a plurality of slits 136s may be provided.

Although the pressure regulating valve 112 shown in FIG. 14 shows a form including a plurality of covers 131, in the pressure regulating valve 112, for example, one cover 31 may be used instead of the plurality of covers 131.

Further, in one example, one pressure regulating valve 12 is mounted on two mounting regions 24, but for example, one pressure regulating valve may be mounted on one mounting region. Further, one pressure regulating valve 12 may be mounted on the four mounting regions.

Further, the cross-sectional shape of the accommodation space S in which the valve body 30 is accommodated is not limited to a substantially circular shape, and may be a polygonal shape such as a quadrangle or a hexagon.

2 ... Power storage module, 11 ... Module body, 12 ... Pressure regulating valve, 16b ... Through hole (first communication hole), 27 ... Joining protrusion (first joining protrusion), 30 ... Valve body (elastic valve body), 31 ... cover, 32 ... bottom wall, 33 ... through hole (second communication hole), 34 ... joint protrusion (second joint protrusion), 36 ... outer wall, 37 ... partition wall (cylinder), 60 ... Body, V ... Internal space, W1, W2 ... Width.

Claims (5)

A module main body having a plurality of internal spaces and a plurality of first communication holes communicated with the plurality of internal spaces, respectively.
It has a housing in which a plurality of second communication holes corresponding to the plurality of first communication holes are formed, and a plurality of elastic valve bodies that close each of the plurality of second communication holes in the housing. , With a pressure control valve attached to the module body,
The module body includes a first joining protrusion that forms a frame shape surrounding each of the plurality of first communication holes and projects toward the pressure regulating valve.
The pressure regulating valve includes a second joining protrusion that projects toward the module body in a frame shape that surrounds the plurality of second communication holes on the outer surface of the housing.
The width of the first joining protrusion is larger than the width of the second joining protrusion.
The first joining protrusion and the second joining protrusion are joined so that each of the plurality of first communication holes and the corresponding plurality of second communication holes communicate with each other. Power storage module. The housing is
A bottom wall having a rectangular plate shape having a longitudinal direction and a width direction and having a plurality of second communication holes formed therein, and a plurality of the second joints formed at the bottom wall separated from each other in the longitudinal direction. A protrusion, a plurality of cylinders protruding from the bottom wall to the opposite side of the module body and accommodating each of the plurality of elastic valve bodies, and a plurality of cylinders connected to the peripheral edge of the bottom wall and surrounding the plurality of cylinders. A case including a frame-shaped outer wall, and
A cover fixed to the outer peripheral wall so as to face the bottom wall is provided.
The first aspect of the present invention, wherein the housing is formed only by the bottom wall, the outer peripheral wall, and the cover in at least a part of the region between the plurality of second joining protrusions in the longitudinal direction. Power storage module. The housing is
A bottom wall having a rectangular plate shape having a longitudinal direction and a width direction and having a plurality of second communication holes formed therein, and a plurality of the second joints formed at the bottom wall separated from each other in the longitudinal direction. A protrusion, a plurality of cylinders protruding from the bottom wall to the opposite side of the module body and accommodating each of the plurality of elastic valve bodies, and a plurality of cylinders connected to the peripheral edge of the bottom wall and surrounding the plurality of cylinders. A case including a frame-shaped outer wall, and
A cover fixed to the outer peripheral wall so as to face the bottom wall is provided.
The power storage module according to claim 1, wherein the housing is formed only by the bottom wall and the outer peripheral wall in at least a part of a region between the plurality of second joining protrusions in the longitudinal direction. .. The power storage module according to claim 2 or 3, wherein a slit is formed in the outer peripheral wall in the partial region. A module main body having a plurality of internal spaces and a plurality of first communication holes communicated with the plurality of internal spaces, respectively.
It has a housing in which a plurality of second communication holes corresponding to the plurality of first communication holes are formed, and a plurality of elastic valve bodies that close each of the plurality of second communication holes in the housing. , A method of manufacturing a power storage module including a pressure regulating valve attached to the module body.
The process of preparing the power storage module and the pressure regulating valve, and
Including a step of joining the power storage module and the pressure regulating valve.
The module body includes a first joining protrusion that forms a frame shape surrounding each of the plurality of first communication holes and projects toward the pressure regulating valve.
The pressure adjusting valve forms a frame shape surrounding each of the plurality of second communication holes on the outer surface of the housing, projects toward the module body, and has a second joining protrusion facing the first joining protrusion. Including,
The width of the first joining protrusion is larger than the width of the second joining protrusion.
In the joining step, in a state where the first joining protrusion and the second joining protrusion are melted, each of the plurality of first communication holes and the corresponding plurality of second communication holes are connected to each other. A method for manufacturing a power storage module, in which the first bonding protrusion and the second bonding protrusion are joined so as to communicate with each other.

Images