JP2018195745A - Power storage module - Google Patents

Abstract

To prevent a gas that is discharged from an exterior body of a power storage device to a gas passage, from flowing reversely from the gas passage to the side of the power storage device in a power storage module comprising multiple or one power storage device.SOLUTION: The present invention relates to a power storage module 1 comprising: a power storage device 10 including an electrode unit 20 and an exterior body 30 in which a sealing part 33 is formed by mutually bonding outer peripheral edges of an upper member 31 and a lower member 32; and a housing body 8 in which multiple power storage devices 10 are housed. The housing body 8 includes a gas passage defining part 60 in which a slit 64 is formed, a long-side sealing part 333 formed with an easily opening part of the sealing part 33 being inserted therethrough, and which defines a space in which the long-side sealing part 333 is inserted through the slit 64; and a partitioning part 610 which is provided in the gas passage defining part 60 over the slit 64 and consists of a flexible member that is abutted to the long-side sealing part 333 while being bent.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a power storage module.

  The power storage device includes a power storage cell having a positive electrode, a negative electrode, and an exterior body containing an electrolyte, and a cell case for sandwiching the power storage cell. The exterior body includes a first portion sandwiched by the cell case; The cell case has a discharge path for discharging the gas released from the second part, and the discharge path extends along the outer periphery of the exterior body. An extended one is known (for example, see Patent Document 1).

JP 2012-230962 A

  In the electricity storage device described in Patent Document 1, even if the gas released from the second part is released to the discharge path, the storage cell is discharged from the discharge path through the communication hole provided between the second part and the discharge path. May flow back to the side and stay in the electricity storage device or leak outside the electricity storage device without going through the discharge path.

  The problem to be solved by the present invention is to suppress backflow of gas released from the exterior body of the power storage device to the gas flow path from the gas flow path to the power storage device side in a power storage module including a plurality or one power storage device. It is providing the electrical storage module which can be performed.

[1] A power storage module according to the present invention includes an electrode unit including a positive electrode plate and a negative electrode plate that are overlapped with each other with an insulating layer interposed therebetween, and two or one sheet provided with the electrode unit interposed therebetween. And an exterior body in which sealing portions extending along the periphery of the positive electrode plate and the negative electrode plate are formed by mutually joining outer peripheral edge portions of the exterior film that are overlapped with each other. A plurality of or one power storage device in which at least a part of one side of the sealing portion is formed with an easily opening portion that is easily opened by an internal pressure of the exterior body as compared with other portions of the sealing portion; Or an electrical storage module including an electrical storage device that houses one electrical storage device, wherein the housing is formed with a slit through which the one side of the sealing portion is inserted, and through the slit in front of the sealing portion. A gas flow path defining portion that defines a space in which one side is inserted, and the gas flow path defining portion is provided so as to close the slit, and is bent with respect to the one side of the sealing portion. And an abutting partition part.

[2] In the above invention, the easy opening part is opened by an internal pressure of the exterior body compared to the other part of the sealing part because the peel strength is lower than that of the other part of the sealing part. It may be easy.

[3] In the above invention, the container includes a plurality of support members that support the plurality of power storage devices in a stacked state, and the support members include the gas flow path defining unit and the partition unit, respectively. May be provided.

[4] In the above invention, the container includes a plurality of support members that support a plurality of the power storage devices in a stacked state, the gas flow path defining portion in which the plurality of slits are formed, And a gas flow path unit integrated with the plurality of support members.

[5] In the above invention, the partition portion may include a pair of sealing members provided so as to sandwich the one side of the sealing portion in the thickness direction.

[6] In the above invention, the partition portion may include one seal member provided so as to press the one side of the sealing portion against an edge portion of the slit in the thickness direction.

  In the present invention, in a power storage module including a plurality of or one power storage device, a slit through which one side of the exterior body provided with the easy-opening portion can be inserted is closed by the partition portion, so that the gas flow path from the exterior body of the power storage device It is possible to suppress the gas released into the gas from flowing backward from the gas flow path to the power storage device side.

FIG. 1 is a plan view showing a power storage device included in a power storage module according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a perspective view showing the power storage module in the embodiment of the present invention. FIG. 4 is a perspective view showing a support member provided in the power storage module according to the embodiment of the present invention. FIG. 5 is an exploded perspective view showing the power storage module in the embodiment of the present invention. FIG. 6 is an equivalent circuit diagram of the power storage module in the embodiment of the present invention. FIG. 7 is a cross-sectional view showing a gas flow path defining portion and one long side sealing portion. FIG. 8 is a perspective view showing a partition portion according to another embodiment. FIG. 9 is a cross-sectional view showing a gas flow path defining unit according to another embodiment. FIG. 10 is a cross-sectional view showing a gas flow path defining unit according to another embodiment. FIG. 11 is a perspective view showing a power storage module according to another embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view showing an electricity storage device 10 according to the present embodiment, and FIG. 2 is a sectional view taken along the line II-II in FIG. The electricity storage device 10 shown in these drawings is a laminated lithium ion capacitor, and includes an electrode unit 20, an exterior body 30 that houses the electrode unit 20, a positive terminal 40 and a negative electrode that are electrically connected to the electrode unit 20. And a terminal 50.

  The electrode unit 20 in the present embodiment includes a plurality of positive plates 21, a plurality of negative plates 22, and a plurality of separators 23. The positive electrode plates 21 and the negative electrode plates 22 are alternately stacked with separators 23 interposed therebetween. In addition, the number of the positive electrode plate 21, the negative electrode plate 22, and the separator 23 which comprise the electrode unit 20 is not specifically limited.

  The positive electrode plate 21 includes a positive electrode current collector 211 and a positive electrode active material layer 212 provided on both surfaces of the positive electrode current collector 211. For the uppermost positive electrode plate 21, the positive electrode active material layer 212 may be provided only on the lower surface of the positive electrode current collector 211.

  The positive electrode current collector 211 of the positive electrode plate 21 is a foil-shaped member having a large number of through holes. The positive electrode current collector 211 is composed of expanded metal, punching metal, etching foil, or the like. Moreover, as a material which comprises this positive electrode electrical power collector 211, metal materials, such as aluminum and stainless steel, can be used, and aluminum is used in this embodiment.

  The positive electrode active material layer 212 of the positive electrode plate 21 is formed by attaching a positive electrode active material or the like to the surface of the positive electrode current collector 211 by coating or the like. As the positive electrode active material contained in the positive electrode active material layer 212, an electric double layer can be formed by adsorption of cations and anions in the electrolytic solution, and an electrochemically stable material having a high specific surface area can be used. Although not particularly limited, for example, activated carbon powder can be exemplified as the positive electrode active material contained in the positive electrode active material layer 212. Note that the positive electrode active material layer 212 may contain a conductive material, a binder, or the like as necessary.

  The negative electrode plate 22 includes a negative electrode current collector 221 and negative electrode active material layers 222 provided on both surfaces of the negative electrode current collector 221. For the lowermost negative electrode plate 22, the negative electrode active material layer 222 may be provided only on the upper surface of the negative electrode current collector 221.

  The negative electrode current collector 221 of the negative electrode plate 22 is a foil-like member having a large number of through holes, like the positive electrode current collector 211 described above. The negative electrode current collector 221 is composed of expanded metal, punching metal, etching foil, or the like. Moreover, copper, stainless steel, nickel, etc. can be used as a metal material which comprises this negative electrode collector 221. In this embodiment, copper is used.

  The negative electrode active material layer 222 of the negative electrode plate 22 is formed by attaching a negative electrode active material or the like to the surface of the negative electrode current collector 221 by coating or the like. The negative electrode active material contained in the negative electrode active material layer 222 is not particularly limited as long as it can reversibly carry lithium ions. For example, graphite, various carbon materials, polyacene-based conductive polymers, Examples thereof include tin oxide and silicon oxide. Note that the negative electrode active material layer 222 may contain a conductive material, a binder, or the like as necessary.

  The separator 23 is made of a porous body that is durable against an electrolytic solution, a positive electrode active material, a negative electrode active material, and the like and has communication holes but does not have electron conductivity. Specifically, this separator is comprised from the nonwoven fabric formed from cellulose, polyethylene, etc., a microporous film, etc. The separator 23 is impregnated with an electrolytic solution. The electrolytic solution is usually a liquid and impregnated in the separator 23, but may be used in the form of a gel or a solid to prevent leakage. In this case, the separator 23 may be omitted.

  As a solvent constituting the electrolytic solution, an aprotic organic solvent is preferably used. Examples of the aprotic organic solvent include ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, γ-butyrolactone, acetonitrile, dimethoxyethane, tetrahydrofuran, dioxolane, methylene chloride, sulfolane and the like. it can. Moreover, you may use the liquid mixture which mixed 2 or more types of these aprotic organic solvents.

Moreover, as an electrolyte dissolved in said solvent, arbitrary materials can be used if it is an electrolyte which can produce | generate lithium ion. Examples of such an electrolyte include LiI, LiClO ₄ , LiAsF ₆ , LiBF ₄ , LiPF ₆ , LiFSI, LiTFSI, and the like.

  Furthermore, the electrode unit 20 in the present embodiment includes a lithium electrode 241 provided on the lithium electrode current collector 242 inside the electricity storage device 10 as a lithium supply source. The lithium electrode 241 is composed of a metal foil or a metal plate that is pressure-bonded to the upper surface of the lithium electrode current collector 242. The lithium electrode 241 is made of a material containing at least lithium and capable of supplying lithium ions. Specific examples of the material constituting the lithium electrode 241 include lithium and a lithium-aluminum alloy. The lithium electrode current collector 242 is made of a conductive porous material such as a thin plate or thin foil made of copper or stainless steel, a stainless mesh, or a copper expanded metal. The lithium electrode 241 is stacked on the lowermost negative electrode active material layer 222 via the separator 23.

  In the present embodiment, the lithium electrode 241 and the lithium electrode current collector 242 constitute a part of the negative electrode. That is, as will be described later, the lithium electrode current collector 242 is connected to the negative electrode terminal 50, and lithium can be supported on the negative electrode active material. In order to smoothly carry lithium on the negative electrode, the lithium electrode 241 and the lithium electrode current collector 242 are preferably disposed so as to face the negative electrode plate 22 with the separator 23 interposed therebetween.

  The lithium electrode 241 and the lithium electrode current collector 242 are not limited to the form shown in FIG. For example, although not particularly illustrated, (1) a configuration in which a negative electrode plate 22 is further provided on the uppermost positive electrode plate 21 and a lithium electrode 241 and a lithium electrode current collector 242 are further added on the negative electrode plate 22; 2) The lithium electrode 241 may be added between the two negative plates 22 in the central region of the electrode unit 20.

  As an example of the positive electrode current collector 211, a rectangular substrate portion 2111 and an extension portion 2112 extending in a direction orthogonal to the short side from the center of one short side of the substrate portion 2111 are provided. . The corner portion of the substrate portion 2111 is formed in an arc shape. The extension part 2112 is formed in a rectangular shape in plan view, and the long side of the extension part 2112 is parallel to the short side of the substrate part 2111.

  As shown in FIG. 2, the extension 2112 is bent toward the center in the thickness direction of the electricity storage device 10 on the proximal end side, and further bent toward the outer peripheral side of the electricity storage device 10 on the distal end side. A rectangular joint portion 2112A parallel to the substrate portion 2111 is formed at the distal end portion of the extension portion 2112. The joint portions 2112A of the plurality of extension portions 2112 are overlapped with each other and joined by welding or the like. ing.

  The negative electrode current collector 221 includes a rectangular substrate portion 2211 and an extension portion 2212 extending in the direction orthogonal to the short side from the center of one short side of the substrate portion 2211. A corner portion of the substrate portion 2211 is formed in an arc shape. The extension portion 2212 is formed in a rectangular shape in plan view, and the long side of the extension portion 2212 is parallel to the short side of the substrate portion 2211.

  As an example of the extension 2212, the base 22 is bent toward the center in the thickness direction of the power storage device 10, and is further bent toward the outer peripheral side of the power storage device 10 at the distal end. A rectangular joint portion 2212A parallel to the substrate portion 2211 is formed at the distal end portion of the extension portion 2212. The joint portions 2212A of the plurality of extension portions 2212 are overlapped with each other and joined by welding or the like. ing.

  That is, the electrode unit 20 includes an electrode laminate 20A in which the substrate portions 2111, 2111, and the separator 23 are laminated, a positive electrode current collector laminate 20B in which the rectangular joint portion 2112A is laminated, and a rectangular joint portion. A negative electrode current collector laminate 20C in which 2212A is laminated.

  The exterior body 30 includes an upper member 31 and a lower member 32. The upper member 31 is a rectangular laminate film, and has a rectangular recess 311 in the center in plan view. Similarly, the lower member 32 is a rectangular laminate film, and has a rectangular recess 321 in the center in plan view. The recesses 311 and 321 overlap vertically and form a space that can accommodate the electrode stack 20A. One of the upper member 31 and the lower member 32 may have a recess 311 and the other may have a flat shape without having a recess. In this case, compared with the case where both the upper member 31 and the lower member 32 have the recesses 311, the space for accommodating the electrode laminate 20 </ b> A is about half, but the necessary space is determined by the depth design of the recesses. Adjustable to ensure.

  As shown in the enlarged view of FIG. 2, the laminate film constituting the upper member 31 and the lower member 32 includes a metal foil 30A made of aluminum or the like, and a first and a second laminated on both surfaces of the metal foil 30A, respectively. 2nd resin film 30B, 30C is provided, and it has moderate flexibility. The first resin film 30B laminated on the inner surface of the metal foil 30A is made of a resin material excellent in electrolytic solution resistance and heat fusion property, such as polypropylene. On the other hand, the second resin film 30C laminated on the outer surface of the metal foil 30A is made of a resin material excellent in strength and electrical insulation, such as nylon. Each of the first and second resin films 30B and 30C may be made of a plurality of layers of resin materials.

  The outer peripheral edge of the upper member 31 and the outer peripheral edge of the lower member 32 are joined together by heat-sealing the first resin film 30B. Thereby, the sealing part (heat seal part) 33 which seals the exterior body 30 is formed over the whole periphery of the exterior body 30, and the electrode unit 20 is accommodated in the inside of the sealed exterior body 30. .

  As shown in FIG. 1, the sealing portion 33 includes a pair of short side sealing portions 331 and 331 that seal the short side of the exterior body 30 and a pair of long side seals that seal the long side of the exterior body 30. Stop portions 332 and 333 are provided. The positive electrode current collector laminate 20B is disposed in the vicinity of one short side sealing portion 331, and the negative electrode current collector laminate 20C is disposed in the vicinity of the other short side seal portion 331. In the following description, the side where the positive electrode current collector laminate 20B is provided in the outer package 30 is referred to as the positive electrode side of the outer package 30, and the side where the negative electrode current collector laminate 20C is provided in the outer package 30. Is referred to as the negative electrode side of the outer package 30.

  Here, the peel strength of one long side sealing portion 333 is set lower than the peel strength of the other long side sealing portion 332 and the pair of short side sealing portions 331 and 331. As a method of setting the peel strength of one long side sealing portion 333 lower than the peel strength of the other long side sealing portion 332 and the pair of short side sealing portions 331 and 331, one long side sealing A method of reducing the adhesive force of one long-side sealing portion 333 by adsorbing an electrolyte solution to the fusion layers of the upper and lower laminate films constituting the portion 333, or the other long-side sealing portion 332 and a pair of short sides A method for mechanically restraining the sealing portion 331 can be exemplified. In the present embodiment, the former method is adopted.

  The positive electrode terminal 40 is formed of a rectangular plate-like base material, and the base material is made of a metal material whose main component is aluminum, that is, aluminum or an aluminum alloy. The positive terminal 40 is arranged at the center of the short side on the positive electrode side of the outer package 30.

  As shown in FIG. 2, one end 40A of the positive electrode terminal 40 and the positive electrode current collector laminate 20B are overlapped with each other and joined by welding or the like. The positive electrode terminal 40 extends from the top of the positive electrode current collector laminate 20 </ b> B to the outside of the outer package 30 through the upper and lower laminate films constituting one short side sealing portion 331.

  The negative electrode terminal 50 is formed of a rectangular plate-like base material, and the base material is made of a metal material whose main component is copper. The copper surface is coated with a nickel layer. The negative electrode terminal 50 is arranged at the center of the short side on the negative electrode side of the outer package 30.

  The one end portion 50A of the negative electrode terminal 50 and the negative electrode current collecting laminate 20C are overlapped with each other and joined by welding or the like. The negative electrode terminal 50 extends from the upper side of the negative electrode current collecting laminate 20 </ b> C to the outside of the outer package 30 through the upper and lower laminate films constituting the other short side sealing portion 331.

  3 is a perspective view showing a power storage module 1 composed of a plurality of power storage devices 10, FIG. 4 is a perspective view showing a support member 2 provided in the power storage module 1, and FIG. FIG. 6 is an equivalent circuit diagram of the power storage module 1. As shown in these drawings, the power storage module 1 includes a plurality (ten in this example) of power storage devices 10 stacked on each other, and a container 8 that stores the plurality of power storage devices 10. The container 8 includes a plurality of (the same number as the power storage devices 10, 10 in this example) support members 2 that support the power storage devices 10, and a pair of side plates 9. 3 and 5, only one side plate 9 is shown and the other side plate 9 is omitted, but the pair of side plates 9 are provided on the front side and the back side of the container 8 in the drawing. Yes. Each side plate 9 is fixed to the front side or the back side of the plurality of stacked support members 2 in the drawing by, for example, screwing or adhesive. Alternatively, the support member 2 and the side plate 9 may be fitted to each other to be fixed.

  The plurality of power storage devices 10 are stacked such that the contact portion 40B of the positive electrode terminal 40 of the lower power storage device 10 and the contact portion 50B of the negative electrode terminal 50 of the upper power storage device 10 overlap. A plate-like support member 2 made of an electrically insulating material is interposed between the electricity storage devices 10 adjacent to each other vertically.

  The support member 2 includes a rectangular plate portion 2A, a cradle portion 2B provided on a pair of short sides of the plate portion 2A, and a terminal block portion 2C provided at the center of the cradle portion 2B. Yes. The plate portion 2 </ b> A may be provided with a stress relaxation structure (spring, cushion) for relaxing a load applied in the thickness direction of the electricity storage device 10. The pair of cradle portions 2B protrude upward from the pair of short sides of the plate portion 2A, and support the upper support member 2 so that a space capable of accommodating the electricity storage device 10 is formed between the plate portion 2A. . Further, through holes 2D are formed at both ends in the longitudinal direction of the cradle part 2B (corresponding to the corners of the support member 2). The plurality of support members 2 are fastened and integrated by bolts 3 inserted through the through-holes 2D at the four corners, so that a container 8 that is a stacked body of the plurality of support members 2 is configured. Note that the plurality of support members 2 may be integrated by clamping the entire laminated body of the plurality of support members 2 from above and below, instead of being fastened and integrated using the bolts 3.

  2 C of terminal block parts are provided in the recessed part formed in the center part of the base part 2B. The height position of the terminal block portion 2C is higher than the upper surface of the plate portion 2A. The terminal block 2C is provided with a terminal 5 extending from the upper surface to the side surface. The upper surface of the terminal portion 5 is provided at a position corresponding to the contact portions 40 </ b> B and 50 </ b> B of the electricity storage device 10. A screw hole 5 </ b> A is formed on the upper surface of the terminal portion 5. The contact portion 40B of the positive terminal 40 is fixed to the upper surface of one terminal portion 5 by a screw 4 inserted through the screw hole 40C. Further, the contact portion 50B of the negative electrode terminal 50 is fixed to the upper surface of the other terminal portion 5 by a screw 4 inserted through the screw hole 50C.

  A screw hole 5 </ b> B is formed on the side surface of the terminal portion 5. The upper terminal portion 5 to which the contact portion 40B of the positive electrode terminal 40 is fixed and the lower terminal portion 5 to which the contact portion 50B of the negative electrode terminal 50 is fixed are connected via the connection fitting 7. The positive terminal 40 of the uppermost power storage device 10 among the ten power storage devices 10 constitutes the positive input / output terminal of the power storage module 1. On the other hand, the negative electrode terminal 50 of the lowermost power storage device 10 among the ten power storage devices 10 constitutes the negative input / output terminal of the power storage module 1.

  A gas flow path defining section 60 is provided on one long side of the plate section 2A. The gas flow path defining section 60 includes a wall portion 61 formed so as to extend along the long side in the vicinity of one long side of the plate portion 2A, and from the upper end of the wall portion 61 to above the long side. An extended top plate portion 62 is provided. The wall part 61 protrudes from the upper surface of the plate part 2A. Moreover, the upper surface of the top plate part 62 and the upper surface of the cradle part 2B are the same height and are continuous.

  Here, an opening is formed between the plate portion 2 </ b> A and the top plate portion 62, and this opening is closed by the side plate 9. Thereby, the gas flow path 63 surrounded by the plate portion 2A, the wall portion 61, the top plate portion 62, the side plate 9, and a partition portion 610 described later is formed.

  FIG. 7 is a cross-sectional view showing the gas flow path defining part 60 and one long side sealing part 333. As shown in FIGS. 4, 5, and 7, a slit 64 is formed in the central portion of the wall portion 61 in the height direction. The slit 64 extends from one end portion in the longitudinal direction (width direction) of the wall portion 61 to the other end portion, and bisects the wall portion 61 in the vertical direction.

  The gas flow path defining unit 60 includes a partition unit 610 provided so as to close the slit 64. The partition 610 includes an upper seal member 611 that closes the upper region of the slit 64 and a lower seal member 612 that closes the lower region of the slit 64, and includes the seal member 611 and the seal member 612. Thus, the region in which the electricity storage device 10 is accommodated and the gas flow path defining unit 60 are partitioned. The upper end of the upper seal member 611 is fixed to the surface of the wall 61 on the gas flow path 63 side, and the lower end of the lower seal member 612 is fixed to the surface of the wall 61 on the gas flow path 63 side. ing. The upper seal member 611 and the lower seal member 612 are fixed to the surface of the wall 61 on the gas flow path 63 side by a method such as screwing or adhesive. Alternatively, in order to easily replace the seal members 611 and 612, the seal member 611 and the seal member 612 may be fixed by a pressing plate fixed with screws.

  Here, the upper seal member 611 and the lower seal member 612 are made of a flexible rubber material or resin material, and are bent from the slit 64 to the inside of the gas flow path defining unit 60. The lower end portion of the upper seal member 611 and the upper end portion of the lower seal member 612 are in contact with each other. One long side sealing portion 333 is inserted into the gas flow path defining portion 60 from between the upper seal member 611 and the lower seal member 612. The one long side sealing portion 333 is a sealing portion having a lower peel strength than the other long side sealing portion 332 and the pair of short side sealing portions 331 and 331.

  As described above, in the power storage module 1 according to the present embodiment, one long side sealing portion 333 of the sealing portion 33 is opened by the internal pressure of the exterior body 30 as compared to the other portion of the sealing portion 33. An easily openable portion is formed, and the housing 8 that houses the power storage module 1 has a gas flow path that serves as a flow path for the released gas when the long side sealing portion 333 is opened by the internal pressure of the exterior body 30. A gas flow path defining unit 60 that defines 63 is provided. Here, the gas flow path defining portion 60 is formed with a slit 64 through which one long side sealing portion 333 is inserted, and flexible upper and lower portions provided so as to close the slit 64. The seal members 611 and 612 are in contact with the long side sealing portion 333 in a bent state. Thereby, the airtightness of the slit 64 can be effectively increased, and the long side sealing portion 333 is released from the long side sealing portion 333 to the gas flow path 63 when opened by the internal pressure of the exterior body 30. It is possible to prevent the gas from flowing backward from the slit 64 to the power storage device 10 side. In addition, since the upper and lower seal members 611 and 612 are made of flexible members, it is possible to prevent the restraining force of the upper and lower seal members 611 and 612 against the long-side sealing portion 333 from increasing excessively. Thus, the long side sealing portion 333 can be opened by the internal pressure of the exterior body 30 as necessary. The gas flow path defining unit 60 is formed with a gas discharge unit (not shown) for discharging the gas discharged from the power storage device 10 and flowing into the gas flow path defining unit 60 to the outside of the power storage module 1. Yes. The gas discharge part can be formed at any position of the gas flow path defining part 60.

  Here, the other part of the sealing part 33 is mechanically constrained, and only one long side sealing part 333 is configured not to be mechanically constrained. Compared with other parts of the sealing portion 33, it can be easily opened by the internal pressure of the exterior body 30. However, when adopting such a configuration, the configuration of the container 8 is complicated. On the other hand, in the electricity storage module 1 according to the present embodiment, the peel strength of one long side sealing portion 333 is lower than the peel strength of the other part of the sealing portion 33, thereby The stop portion 333 is easily opened by the internal pressure of the exterior body 30 as compared with other portions of the sealing portion 33. Thereby, one long side sealing part 333 can be opened by the internal pressure of the exterior body 30 in preference to the other part of the sealing part 33 without complicating the configuration of the container 8.

  Further, in the power storage module 1 according to the present embodiment, the container 8 includes a plurality of support members 2 that support a plurality of power storage devices 10 in a stacked state. The formation part 60 and the partition part 610 are provided. That is, the power storage device 10, the support member 2, the gas flow path defining part, and the partition part 610 are configured as one unit. Thereby, when increasing / decreasing the number of the electrical storage devices 10 according to the request | requirement output of the electrical storage module 1, it can respond also to the increase / decrease in the gas flow path definition part 60 and the partition part 610 by increasing / decreasing the number of units.

  Further, in the power storage module 1 according to the present embodiment, the partition portion 610 is configured by a pair of upper and lower seal members 611 and 612 provided so as to sandwich one long side sealing portion 333 therebetween. Thereby, when the space | interval is large between the long side sealing part 333 penetrated by the slit 64, and the upper side and lower side of a slit, or when the long side sealing part 333 has floated from the upper surface of the board part 2A etc. In addition, the slit 64 can be closed by the pair of upper and lower seal members 611 and 612. Further, when the pair of upper and lower seal members 611 and 612 are bent and opened, one long side sealing portion 333 is allowed to be opened by the internal pressure of the exterior body 30.

  FIG. 8 is a perspective view showing a partition 620 according to another embodiment. As shown in this figure, the partition portion 620 includes an upper seal member 621 that closes the upper region of the slit 64 and a lower seal member 622 that closes the lower region of the slit 64. The upper end of the upper seal member 621 is fixed to the surface of the wall 61 on the gas flow path 63 side, and the lower end of the lower seal member 622 is fixed to the surface of the wall 61 on the gas flow path 63 side. ing. The upper seal member 621 and the lower seal member 622 are made of a flexible rubber material, resin material, or the like.

  Here, a notch 621 A is formed at the lower end of the upper seal member 621, and a notch 622 A is formed at the upper end of the lower seal member 622. The notch 621A is not formed at both ends of the lower end of the upper seal member 621, and the notch 622A is not formed at both ends of the upper end of the lower seal member 622. As a result, the upper seal member 621 and the lower seal member 622 are deflected from the slit 64 to the inside of the gas flow path defining unit 60, and both ends of the lower end of the upper seal member 621 and the lower seal member 622 are bent. The both ends of the upper end of the are in contact with each other. The width (height dimension) of the slit 623 formed by the upper notch 621A and the lower notch 622A is equal to the thickness of the long side sealing portion 333, and the length of the slit 623 is (Dimension in the horizontal direction) is equivalent to the length of the long side sealing portion 333. The long side sealing portion 333 is inserted into the gas flow path defining portion 60 through the slit 623.

  In the partition portion 620 according to the present embodiment, slits 623 including upper and lower cutouts 621A and 622A are formed at the lower end portion of the upper seal member 621 and the upper end portion of the lower seal member 622. The long side sealing portion 333 is inserted. Thereby, since the restraining force of the one long side sealing part 333 by the upper and lower sealing members 621 and 622 can be suppressed, the one long side sealing part 333 is opened by the internal pressure of the exterior body 30 as necessary. Can be realized even more reliably.

  FIG. 9 is a cross-sectional view showing a gas flow path defining unit 70 according to another embodiment. As shown in this figure, the gas flow path defining portion 70 according to the present embodiment includes a wall portion 71 formed in the vicinity of one long side of the plate portion 2A so as to extend along the long side, and a wall A top plate portion 72 extending from the upper end of the portion 71 to above the long side. The upper surface of the top plate portion 72 and the upper surface of the cradle portion 2B are the same height and are continuous. The wall portion 71 protrudes downward from the lower end of the top plate portion 72.

  The exterior body 130 of the present embodiment includes an upper member 31 having a recess 311 and a flat lower member 132, and protrudes only from the sealing portion 33 to the upper side. Therefore, the sealing part 33 is in contact with the upper surface of the plate part 2A.

  An opening is formed between the plate portion 2 </ b> A and the top plate portion 72, and this opening is closed by the side plate 9. Thereby, the gas flow path 73 enclosed by 2 A of board parts, the wall part 71, the top plate part 72, the side plate 9, and the partition part 710 mentioned later is formed. A slit 74 is formed between the wall portion 71 and the plate portion 2A. The slit 74 extends from one end portion in the longitudinal direction (width direction) of the wall portion 71 to the other end portion. The gas flow path defining unit 70 includes a partition unit 710 provided to close the slit 74. The upper end portion of the partition portion 710 is fixed to the surface of the wall portion 71 on the gas flow path 73 side.

  Here, the partition portion 710 is made of a flexible rubber material or resin material, and is bent from the slit 74 to the inside of the gas flow path defining portion 70. One long side sealing portion 333 is inserted into the gas flow path defining portion 70 from between the partition portion 710 and the upper surface of the plate portion 2A.

  As described above, in the gas flow path defining unit 70 according to the present embodiment, the partition unit 710 made of one flexible member connects one long side sealing unit 333 to the lower edge (plate unit) of the slit 74. 2A). Thereby, in the configuration in which there is a gap between one long side sealing portion 333 inserted through the slit 74 and the upper side of the slit, and there is no interval between the long side sealing portion 333 and the lower side of the slit, The slit 74 can be closed by the two partition portions 710.

  FIG. 10 is a cross-sectional view showing a gas flow path defining unit 80 according to another embodiment. As shown in this figure, the gas flow path defining unit 80 according to the present embodiment extends along the long side in the vicinity of one long side of the upper surface of the plate part 2A on which the electricity storage device 10 is placed. A lower wall portion 81A formed on the upper surface of the power storage device 10 and an upper wall portion 81B formed in the vicinity of one long side of the lower surface of the upper plate portion 2A of the power storage device 10 so as to extend along the long side; A bottom plate portion 82A extending from the upper end of the lower wall portion 81A to above the long side and a top plate portion 82B extending from the lower end of the upper wall portion 81B to the long side are provided. The lower wall portion 81A protrudes upward from the upper surface of the lower plate portion 2A, and the upper wall portion 81B protrudes downward from the lower surface of the upper plate portion 2A.

  An opening is formed between the bottom plate portion 82 </ b> A and the top plate portion 82 </ b> B, and this opening is closed by the side plate 9. Thereby, a gas flow path 83 surrounded by the plate portion 2A, the lower wall portion 81A, the bottom plate portion 82A, the side plate 9, the top plate portion 82B, the upper wall portion 81B, and a partition portion 810 described later is formed. Yes.

  A slit 84 is formed between the lower wall portion 81A and the upper wall portion 81B. The slit 84 extends from one end to the other end in the longitudinal direction (width direction) of the upper and lower wall portions 81A and 81B. The gas flow path defining unit 80 includes a partition unit 810 provided to close the slit 84. The partition portion 810 includes an upper seal member 811 that closes the upper region of the slit 84 and a lower seal member 812 that closes the lower region of the slit 84. The upper end portion of the upper seal member 811 is fixed to the surface of the upper wall portion 81B on the gas flow path 83 side, and the lower end portion of the lower seal member 812 is fixed to the gas flow path 83 side of the lower wall portion 81A. It is fixed to the surface.

  Here, the upper seal member 811 and the lower seal member 812 are made of a flexible rubber material, resin material, or the like, bent from the slit 84 to the inside of the gas flow path defining unit 80, The lower end portion of the upper seal member 811 and the upper end portion of the lower seal member 812 are in contact with each other. One long side sealing portion 333 is inserted into the gas flow path defining portion 80 from between the upper seal member 811 and the lower seal member 812.

  FIG. 11 is a perspective view showing a power storage module 1000 according to another embodiment. As shown in this figure, the power storage module 1000 of the present embodiment includes a plurality (ten in this example) of power storage devices 10 stacked on each other, and a container 1100 that stores the plurality of power storage devices 10. Yes. The container 1100 includes a plurality of support members 1200 that support the power storage devices 10 (the same number as the power storage devices 10 and 10 in this example), side plates 9 (not shown), and a gas flow path unit 1300. Yes. The side plate 9 (not shown) is screwed to the front side of the container 1100 in the figure, and the gas flow path unit 1300 is screwed to the back side of the container 1100 in the figure.

  In the container 1100 of this embodiment, each support member 1200 is not formed with a gas flow path, and the gas flow path unit 1300 is formed with a gas flow path. The gas flow path unit 1300 includes a thin casing 1310 and a plurality of (the same number as the power storage devices 10, ten in this example) partition portions 1320. The casing 1310 is screwed to the side surfaces of the pair of cradle portions 2B of the plurality of stacked support members 1200. Note that the housing 1310 includes a partition wall (not shown) that separates the screw hole and the gas flow path.

  A plurality of slits 1312 are provided at predetermined intervals in the height direction on the main surface 1311 of the housing 1310 on the support member 1200 side. Each slit 1312 is arranged at the height of the sealing portion 33 of each power storage device 10. Each partition 1320 includes an upper seal member 1321 that closes the upper region of the slit 1312 and a lower seal member 1322 that closes the lower region of the slit 64. The upper end portion of the upper seal member 1321 is fixed to the back surface of the main surface 1311, and the lower end portion of the lower seal member 1322 is fixed to the back surface of the main surface 1311.

  The upper seal member 1321 and the lower seal member 1322 are made of a flexible rubber material, a resin material, or the like. The upper seal member 1321 and the lower seal member 1322 are bent from the slit 1312 to the inside of the housing 1310, and the lower end of the upper seal member 1321. And the upper end of the lower seal member 1322 are in contact with each other. One long side sealing portion 333 is inserted into the housing 1310 from between the upper seal member 1321 and the lower seal member 1322.

  As described above, in the power storage module 1000 according to the present embodiment, the gas flow path, the plurality of slits 1312, and the plurality of partition portions 1320 are separate units from the support member 1200. Since the configuration can be simplified, an increase in cost can be reduced when the number of supporting members 1200 manufactured is increased.

  The “power storage module 1” and “power storage module 1000” in the above-described embodiment correspond to an example of “power storage module” in the present invention, and the “power storage device 10” in the above-described embodiment is an example of “power storage device” in the present invention. The “container 8” and “container 1100” in the above-described embodiment correspond to an example of the container in the present invention.

  The “electrode unit 20” in the above embodiment corresponds to an example of the “electrode unit” in the present invention, and the “positive electrode plate 21” in the above embodiment corresponds to an example of the “positive electrode plate” in the present invention. The “negative electrode plate 22” in the embodiment corresponds to an example of the “negative electrode plate” in the present invention, and the “separator 23” in the above-described embodiment corresponds to an example of the “insulating layer” in the present invention.

  The “exterior body 30” and the “exterior body 130” in the above-described embodiment correspond to an example of the “exterior body” in the present invention, and the “upper member 31” and the “lower member 32” in the above-described embodiment are the present invention. Corresponds to an example of the “exterior film” in the above embodiment, the “sealing portion 33” in the above-described embodiment corresponds to an example of the “sealing portion” in the present invention, and the “long-side sealing portion 333” in the above-described embodiment. Corresponds to an example of “one side of the sealing portion” and “easy opening portion” in the present invention.

  The “gas flow path defining section 60”, “gas flow path defining section 70”, “gas flow path defining section 80” and “housing 1310” in the above-described embodiment are the “gas flow path defining section” according to the present invention. "Slit 64", "slit 74", "slit 84" and "slit 1312" in the above-described embodiment correspond to an example of "slit" in the present invention. “Partition part 610”, “partition part 710”, “partition part 810”, and “partition part 1320” correspond to an example of “partition part” in the present invention.

  “Upper seal member 611” and “lower seal member 612” in the above embodiment, “upper seal member 811” and “lower seal member 812” in the above embodiment, “in the above embodiment” The “upper seal member 1321” and the “lower seal member 1322” correspond to “a pair of seal members” in the present invention.

  The “support member 2” and the “support member 1200” in the above embodiment correspond to an example of the “support member” in the present invention, and the “gas channel unit 1300” in the above embodiment is the “gas channel” in the present invention. It corresponds to an example of “unit”.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention. For example, in the above-described embodiment, the present invention has been described by taking a lithium ion capacitor as an example. However, the present invention can also be applied to other power storage devices and power storage modules such as lithium ion batteries.

  In the above-described embodiment, the entire one long side sealing portion 333 is the easy opening portion, but at least a part of the one long side sealing portion 333 may be the easy opening portion. In addition, it is not essential to form an easy opening part in the long side sealing part 333. If there is no terminal in the short side sealing part 331, an easy opening part is formed in the short side sealing part 331. Also good.

In the above-described embodiment, one support member 2 is provided for one power storage device 10. For example, one support member 2 is provided on each of the upper surface and the lower surface of the plate portion 2 </ b> A of one support member 2. The configuration of the power storage module 1 can be changed as appropriate, such as fixing the power storage device 10. In addition, it is not essential for the power storage module 1 to include a plurality of power storage devices 10, and a single power storage device 10 may be provided.

  Furthermore, in the above-described embodiment, the two exterior films (the upper member 31 and the lower member 32) are overlapped with each other with the electrode unit 20 interposed therebetween, and the two exterior films overlap each other. The peripheral parts were joined together. However, it is also possible to fold one outer film in half and join the outer peripheral edge portions of the one outer film excluding the fold line of the overlapping portions to each other.

DESCRIPTION OF SYMBOLS 1 ... Power storage module 8 ... Housing 2 ... Supporting member 2A ... Plate part 2B ... Receptacle part 2C ... Terminal block part 2D ... Through-hole 3 ... Bolt 4 ... Screw 5 ... Terminal part 5A ... Screw hole 5B ... Screw hole 7 ... Connection metal fitting 9 ... Side plate 10 ... Power storage device 20 ... Electrode unit 20A ... Electrode laminate 20B ... Positive electrode current collector laminate 20C ... Negative electrode current collector laminate 21 ... Positive electrode plate 211 ... Positive electrode collector
2111 ... Substrate part
2112 ... Extension
2112A ... Junction 212 ... Positive electrode active material layer 22 ... Negative electrode plate 221 ... Negative electrode current collector
2211 ... Substrate part
2212 ... Extension
2212A ... Junction 222 ... Negative electrode active material layer 23 ... Separator 241 ... Lithium electrode 242 ... Lithium electrode current collector 30 ... Exterior body 30A ... Metal foil 30B ... First resin film 30C ... Second resin film 31 ... Upper member 311 ... Recess 32 ... Lower member 321 ... Recess 33 ... Sealing part 331 ... Short side sealing part 332 ... Long side sealing part 333 ... Long side sealing part 130 ... Exterior body 132 ... Lower side member 40 ... Positive electrode terminal 40A ... One end portion 40B ... Contact portion 40C ... Screw hole 50 ... Negative electrode terminal 50A ... One end portion 50B ... Contact portion 50C ... Screw hole 60 ... Gas flow path defining portion 61 ... Wall portion 62 ... Top plate portion 63 ... Gas flow passage 64 ... Slit 610 ... Partition part 611 ... Upper seal member 612 ... Lower seal member 70 ... Gas flow path defining part 71 ... Wall part 72 ... Top plate part 73 ... Gas flow path 74 ... Slit 7 DESCRIPTION OF SYMBOLS 10 ... Partition part 80 ... Gas flow path definition part 81A ... Lower wall part 81B ... Upper wall part 82A ... Bottom plate part 82B ... Top plate part 83 ... Gas flow path 84 ... Slit 810 ... Partition part 811 ... Upper part Seal member 812 ... Lower seal member 1000 ... Power storage module 1100 ... Container 1200 ... Support member 1300 ... Gas flow path unit 1310 ... Housing 1311 ... Main surface 1312 ... Slit 1320 ... Partition part 1321 ... Upper seal member 1322 ... Lower seal member

Claims (6)

An electrode unit comprising a positive electrode plate and a negative electrode plate that are overlapped with each other with an insulating layer interposed therebetween;
Two or one exterior film provided with the electrode unit sandwiched therebetween, and peripheral edges of the exterior film overlapping each other are bonded to each other so that the periphery of the positive electrode plate and the negative electrode plate And an exterior body formed with a sealing portion extending along the side, and at least part of one side of the sealing portion is easily opened by an internal pressure of the exterior body as compared with other portions of the sealing portion. A plurality of or one electricity storage device in which an opening is formed;
A power storage module comprising: a housing for housing the plurality of or one power storage device;
The container is
A gas passage defining part that forms a slit through which the one side of the sealing part is inserted, and that defines a space in which the one side of the sealing part is inserted through the slit;
An electricity storage module comprising: a partition portion provided in the gas flow path defining portion so as to close the slit and abutting in a bent state with respect to the one side of the sealing portion. The power storage module according to claim 1,
The easy opening part is a power storage module that is easy to be opened by the internal pressure of the exterior body compared to the other part of the sealing part because the peel strength is lower than the other part of the sealing part. The power storage module according to claim 1 or 2,
The container includes a plurality of support members that support the power storage device in a stacked state.
Each of the support members is a power storage module including the gas flow path defining unit and the partition unit. The power storage module according to claim 1 or 2,
The container is
A plurality of support members for supporting the power storage device in a stacked state; and
A power storage module comprising: the gas flow path defining section in which a plurality of the slits are formed; and the gas flow path unit integrated with the plurality of support members, the gas flow path defining section having a plurality of the partition sections. The power storage module according to any one of claims 1 to 4,
The partition part is a power storage module including a pair of seal members provided so as to sandwich the one side of the sealing part in the thickness direction. The power storage module according to any one of claims 1 to 4,
The partition unit is a power storage module including one seal member provided so as to press the one side of the sealing unit against an edge of the slit in a thickness direction thereof.

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