JP6672879B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device including an exterior body.

  2. Description of the Related Art In a power storage device including an exterior body and a power storage element housed inside the exterior body, a configuration for discharging exhaust gas from a safety valve or the like included in the energy storage element to the outside of the exterior body is known.

  For example, the exterior body included in the power storage device described in Patent Literature 1 has a communication part that communicates the internal space and the external space of the exterior body and forms a communication part extending in the X-axis direction. The communication portion has a plurality of shielding plates arranged to prevent a substance in the communication passage from moving in the X-axis direction and to maintain communication by the communication passage between the internal space and the external space. In this way, since the exterior body has the communication passage, it is possible to exhaust air from the inside of the exterior body to the outside, and by arranging a plurality of shielding plates in the communication passage, it is scattered to the communication part. It is possible to prevent incoming foreign substances from entering the interior space of the exterior body.

JP-A-2005-056323

  For example, in a power storage device mounted on a machine or a device used outdoors, when a passage that connects the inside and the outside of the exterior body is provided in the exterior body, water such as rainwater flows into the passage. In some cases, the water that has flowed in stays somewhere in the exterior body. In this case, the function of elements included in the power storage device may be impaired by the retained water, for example.

  The present invention has been made in consideration of the above-described conventional problems, and has as its object to provide a power storage device that can efficiently discharge water when the water flows into a structure for ventilation.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention is a power storage device including an exterior body and a power storage element housed in the exterior body, wherein the exterior body includes A ventilation chamber communicating the inside of the exterior body with the outside is provided, and the ventilation chamber has a front wall formed with a through hole communicating with the outside, and a rear wall disposed at a position facing the front wall. A wall, a first wall disposed between the through-hole and the back wall, and extending along a first direction intersecting the front wall, and disposed with a gap between the first wall and the first wall. And the gap is formed from the front wall to the back wall along the first direction.

  According to this configuration, since the exterior body has the ventilation chamber, an excessive increase in the internal pressure of the exterior body is suppressed. Further, since the first wall is disposed on the inner side of the through hole (inside the ventilation chamber), even when water flows at a high speed from the through hole, for example, the momentum is weakened by the first wall. Can be As a result, the inflow of water into the exterior body through the ventilation chamber is suppressed. Furthermore, since there is a gap formed from the front wall to the back wall between the first wall and the side wall, the gap forms a fluid passage along the first direction. Thereby, even if water flows into the ventilation chamber, drainage from the ventilation chamber is promoted.

  Therefore, the power storage device of this embodiment is a power storage device that can efficiently discharge water when water flows into the ventilation structure.

  In the power storage device according to one embodiment of the present invention, the ventilation chamber further includes a second wall that is disposed between the first wall and the back wall and that forms the gap between the first and second walls. It may be.

  According to this configuration, since the second wall is further provided in the ventilation chamber, the flow path of the water flowing from the through-hole is restricted, and the progress to the back can be reduced. In addition, since there is a gap serving as a fluid passage between the side wall and the second wall, good drainage is not impaired.

  In the power storage device according to one embodiment of the present invention, in the ventilation chamber, a plurality of the second walls are arranged in the first direction, and the first wall and the plurality of the second walls are arranged. May be arranged so as to be shifted in a direction intersecting with the first direction.

  According to this configuration, since three or more walls are present in the ventilation chamber, the effect of weakening the force of the water flowing from the through hole is improved. Specifically, three or more walls that are resistant to fluid flowing into the ventilation chamber from the outside are arranged, and each of the three or more walls arranged in the first direction has, for example, a staggered distance between the side walls. It is arranged in. That is, the ventilation chamber has a maze structure that forms a zigzag water flow path, and as a result, the effect of efficiently reducing the momentum of the water that has flowed into the ventilation chamber (for example, the “labyrinth effect”). ) Is played. In addition, for example, since gaps (fluid passages) are formed on the left and right sides of the three or more walls, drainage of water flowing into the ventilation chamber is improved.

  In the power storage device according to one embodiment of the present invention, at least a part of the bottom surface of the ventilation chamber may have a height difference such that the through hole side is lower.

  According to this configuration, for example, the water that has flowed into the ventilation chamber is more efficiently discharged from the through hole (the drainage from the ventilation chamber).

  In the power storage device according to one embodiment of the present invention, the exterior body may further include a ventilation pipe arranged outside the front wall and communicating with the through hole.

  According to this configuration, since the direction of exhaust from the exterior body is regulated in the axial direction of the ventilation pipe, for example, it is easy to design a machine or a device on which the power storage device is mounted in consideration of the exhaust process. Become. In addition, since the flow of water from the outside of the exterior body to the through hole is regulated in the axial direction of the ventilation pipe, water flowing from the through hole can go to the gap formed between the first wall and the side wall. Properties can be reduced. That is, the effectiveness of the first wall as a member that obstructs the flow of water flowing in from the outside is enhanced.

  In the power storage device according to one embodiment of the present invention, the front wall may be provided with a mesh portion that forms the plurality of through holes.

  According to this configuration, each of the plurality of holes of the mesh portion functions as a through hole for ventilation. Therefore, entry of a relatively large foreign object through the through hole is suppressed.

  In the power storage device according to one embodiment of the present invention, the ventilation chamber may further include an opening that is arranged at a position that does not overlap the gap in plan view and communicates with the inside of the exterior body.

  According to this configuration, the possibility that the water that has flowed into the ventilation chamber flows into the space where the power storage element and the like are arranged inside the exterior body through the opening for ventilation is reduced.

  In the power storage device according to one embodiment of the present invention, the ventilation chamber may further include a ventilation waterproof film that covers the opening.

  According to this configuration, even if the water flowing into the ventilation chamber reaches the position of the opening, the water-permeable waterproof membrane prevents water from entering the interior of the exterior body from the opening. be able to.

  Note that the present invention can be realized not only as such a power storage device, but also as an exterior body included in the power storage device according to any of the above aspects.

  According to the power storage device of the present invention, when water flows into the ventilation structure, the water can be efficiently discharged.

FIG. 3 is a perspective view illustrating an appearance of a power storage device according to an embodiment. FIG. 3 is an exploded perspective view showing components when the power storage device according to the embodiment is disassembled. FIG. 3 is an exploded perspective view showing components when the power storage unit according to the embodiment is disassembled. FIG. 2 is an exploded perspective view illustrating a configuration outline of an exterior body according to the embodiment. FIG. 3 is a partially enlarged perspective view illustrating a schematic configuration of a ventilation chamber included in the exterior body according to the embodiment. FIG. 6 is a plan view corresponding to FIG. 5. It is a 1st sectional perspective view showing the internal structure of the ventilation room concerning an embodiment. FIG. 3 is a second perspective view showing the internal structure of the ventilation chamber according to the embodiment. FIG. 14 is a cross-sectional view illustrating an outline of a ventilation structure of a power storage device according to Modification Example 1 of the embodiment. FIG. 14 is a cross-sectional view illustrating an outline of a ventilation structure of a power storage device according to Modification 2 of the embodiment. FIG. 15 is a cross-sectional view illustrating an outline of a ventilation structure of a power storage device according to Modification 3 of the embodiment. FIG. 15 is a cross-sectional view illustrating an outline of a ventilation structure of a power storage device according to Modification 4 of the embodiment. FIG. 15 is a cross-sectional view illustrating an outline of a ventilation structure of a power storage device according to Modification Example 5 of the embodiment.

  Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. It should be noted that each of the embodiments and modifications described below shows a specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, each step in the manufacturing method, the order of each step, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Absent. Further, among the components in the following embodiments and modified examples, components that are not described in independent claims indicating the highest concept are described as arbitrary components.

  Each drawing in the accompanying drawings is a schematic diagram and is not necessarily illustrated exactly. Further, in each drawing, the same or similar components are denoted by the same reference numerals. Further, in the following description of the embodiments, expressions with “substantially” such as approximately half and approximately horizontal may be used. For example, substantially horizontal means not only completely horizontal, but also substantially horizontal, that is, including, for example, a difference of about several percent. The same applies to expressions with other “abbreviations”.

(Embodiment)
First, the configuration of power storage device 1 according to the embodiment will be described.

  FIG. 1 is a perspective view showing the appearance of power storage device 1 according to the embodiment. FIG. 2 is an exploded perspective view showing components when the power storage device 1 according to the embodiment is disassembled.

  In these drawings, the Z-axis direction is shown as an up-down direction, and hereinafter, the Z-axis direction will be described as an up-down direction. However, depending on the use mode, the Z-axis direction may not be up-down direction. The axial direction is not limited to the vertical direction. The same applies to the following figures.

  The power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside. For example, the power storage device 1 is a battery module used for power storage use, power supply use, and the like. Specifically, the power storage device 1 is used as an engine start battery of a moving body such as an automobile, a motorcycle, a watercraft, a snowmobile, an agricultural machine, and a construction machine. The power storage device 1 can supply power to an external load by itself (single), or can be charged by an external power source by itself (single). In other words, there is a configuration in which a plurality of battery modules (power storage devices) are connected as a power source for power of an electric vehicle, a plug-in hybrid electric vehicle, and the like, and are housed in a case to form a battery pack. This is different from such a configuration. Note that a plurality of power storage devices 1 may be electrically connected to form a battery pack according to an external load or an external power supply.

  As shown in FIGS. 1 and 2, power storage device 1 according to the present embodiment includes exterior body 10 having lid 11 and container 12, power storage unit 20 housed inside exterior body 10, holding member 30, and , Bus bars 41, 42 and the like.

  The exterior body 10 is a rectangular (box-shaped) structure that constitutes the exterior body of the power storage device 1. That is, the exterior body 10 is disposed outside the power storage unit 20, the holding member 30, and the bus bars 41 and 42, and the power storage unit 20 and the like are disposed at predetermined positions to protect the power storage unit 20 and the like from impacts and the like. . The exterior body 10 is made of an insulating resin material such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polybutylene terephthalate (PBT), or ABS resin. I have. The exterior body 10 thereby prevents the power storage unit 20 and the like from contacting an external metal member or the like.

  The lid 11 of the exterior body 10 is a flat rectangular cover member that closes the opening 12 a of the container 12, and is provided with a positive external terminal 13 and a negative external terminal 14. The power storage device 1 charges electricity from outside and discharges electricity to the outside via the positive external terminal 13 and the negative external terminal 14. The container 12 is a bottomed rectangular cylindrical housing having an opening formed therein, and houses the power storage unit 20, the holding member 30, the bus bars 41 and 42, and the like.

  Note that the lid 11 and the container 12 may be formed of the same material, or may be formed of different materials. In addition, electric devices such as a circuit board and a relay are arranged inside the lid 11, but illustration and description of the electric devices are omitted.

  Here, exterior body 10 according to the present embodiment has a structure for permitting movement of gas between the inside and the outside, and for preventing inflow of water from the outside to the inside. That is, the exterior body 10 has a structure that allows the inside and the exterior of the exterior body 10 to communicate with each other. Thereby, the gas inside the exterior body 10 can be discharged to the outside of the exterior body 10. Further, gas outside the exterior body 10 can be taken into the interior of the exterior body 10. The structure for ventilation will be described later with reference to FIGS.

  Power storage unit 20 includes a plurality of power storage elements 100 (in this embodiment, twelve power storage elements 100) and a plurality of bus bars 200, and includes positive electrode external terminal 13 and negative electrode external terminal provided on lid 11. 14 and is electrically connected to the power supply. That is, the positive terminal of one of the plurality of power storage elements 100 is electrically connected to positive external terminal 13 via bus bar 200. Further, the negative electrode terminal of any one of the plurality of power storage elements 100 is electrically connected to negative electrode external terminal 14 via bus bar 200.

  The power storage unit 20 is arranged in the container 12 with the plurality of power storage elements 100 arranged in the X-axis direction in a vertically placed state. The power storage unit 20 is housed inside the exterior body 10 with the lid 11 covered from above. The detailed configuration of the power storage unit 20 will be described later.

  The holding member 30 holds the busbars 41 and 42, and other electrical components such as relays and wirings (not shown), and insulates the busbars 41 and 42 from other members and the busbar 41. , 42, etc., are electrical component trays capable of controlling the position. In particular, holding member 30 positions bus bars 41 and 42 with respect to bus bar 200, positive external terminal 13 and negative external terminal 14 in power storage unit 20.

  Specifically, holding member 30 is placed above power storage unit 20 (on the positive side in the Z-axis direction), and is positioned with respect to power storage unit 20. Further, the bus bars 41 and 42 are placed and positioned on the holding member 30. Further, the lid 11 is arranged on the holding member 30. Accordingly, bus bars 41 and 42 are positioned with respect to bus bar 200 in power storage unit 20 and positive external terminal 13 and negative external terminal 14 provided on lid 11.

  The holding member 30 is formed of an insulating resin material such as PC, PP, PE, PPS, PBT, or ABS resin, but may be formed of any material having an insulating property. It doesn't matter.

  The bus bars 41 and 42 electrically connect the bus bar 200 in the power storage unit 20 to the positive external terminal 13 and the negative external terminal 14 provided on the lid 11. That is, the bus bar 41 is a conductive member that electrically connects the bus bar 200 disposed at one end in the power storage unit 20 and the positive electrode external terminal 13. Bus bar 42 is a conductive member that electrically connects bus bar 200 arranged at the other end in power storage unit 20 and negative electrode external terminal 14.

  The bus bars 41 and 42 are formed of, for example, copper as a conductive member, but the material of the bus bars 41 and 42 is not particularly limited. Further, the bus bars 41 and 42 may be formed of members of the same material, or may be formed of members of different materials.

  Next, the configuration of the power storage unit 20 will be described in detail.

  FIG. 3 is an exploded perspective view showing each component when the power storage unit 20 according to the embodiment is disassembled.

  As shown in the figure, the power storage unit 20 includes a plurality of power storage elements 100, a plurality of bus bars 200, a plurality of spacers 300, a pair of sandwiching members 400, a plurality of restraining members 500, a bus bar frame 600, And a heat shield plate 700.

  The storage element 100 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. . The storage element 100 has a flat rectangular shape and is arranged adjacent to the spacer 300. That is, the plurality of power storage elements 100 are alternately arranged with the plurality of spacers 300, respectively, and are arranged in the X-axis direction. In the present embodiment, twelve power storage elements 100 are alternately arranged adjacent to eleven spacers 300. The storage element 100 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery or a capacitor.

  In addition, as shown in the figure, the electric storage element 100 includes a case 110, a positive terminal 120, and a negative terminal 130. In addition, an electrode body (power generation element), a current collector (a positive electrode current collector and a negative electrode current collector), and the like are arranged inside the case 110, and an electrolyte (a nonaqueous electrolyte) and the like are sealed. However, detailed description is omitted.

  The case 110 includes a case main body having a rectangular cylindrical bottom with a bottom, and a metal lid plate closing an opening of the container main body. Further, the case 110 has a structure in which the inside of the case 110 is sealed by, for example, welding the lid plate and the container body after housing the electrode body and the like inside. As described above, the case 110 is a rectangular parallelepiped having a lid plate on the plus side in the Z-axis direction, a long side surface on both sides in the X-axis direction, a short side surface on both sides in the Y-axis direction, and a bottom surface on the minus side in the Z-axis direction. It is a container of a shape. The material of the case 110 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, or an aluminum alloy.

  Further, a safety valve 105 is provided on a cover plate of the case 110. The safety valve 105 is provided in each power storage element 100 as a safety mechanism that opens when the internal pressure of the case 110 rises and releases gas inside the case 110. Note that all of the plurality of power storage elements 100 included in the power storage device 1 are not limited to including the safety valve 105, and it is sufficient that at least one power storage element 100 includes the safety valve 105.

  The positive electrode terminal 120 is an electrode terminal electrically connected to the positive electrode of the electrode body via a positive electrode current collector, and the negative electrode terminal 130 is electrically connected to the negative electrode of the electrode body via a negative electrode current collector. The connected electrode terminals are all attached to the cover plate of the case 110. That is, the positive electrode terminal 120 and the negative electrode terminal 130 lead out the electricity stored in the electrode body to the external space of the power storage element 100, and also introduce electricity into the internal space of the power storage element 100 in order to store the electricity in the electrode body. It is a metal electrode terminal for performing. In the present embodiment, power storage element 100 is arranged with positive electrode terminal 120 and negative electrode terminal 130 facing upward.

  Bus bar 200 is a conductive member that is electrically connected to each of a plurality of power storage elements 100 in power storage unit 20. That is, the bus bar 200 is a conductive member that is electrically connected to each of the electrode terminals of the plurality of power storage elements 100, and electrically connects any of the electrode terminals of the plurality of power storage elements 100. Specifically, the bus bar 200 is arranged on the surface of each electrode terminal included in the plurality of power storage elements 100, and is connected (joined) to the electrode terminal.

  In the present embodiment, five bus bars 200 are arranged, and twelve power storage elements 100 are divided into four sets of three power storage elements 100 connected in parallel by the five bus bars 200. It is configured to be connected in series. In addition, the bus bar 200 disposed at the end is connected to the above-described bus bars 41 and 42, and thereby electrically connected to the positive external terminal 13 and the negative external terminal 14.

  The bus bar 200 is formed of, for example, aluminum as a conductive member, but the material of the bus bar 200 is not particularly limited. Further, all of the bus bars 200 may be formed of members of the same material, or any of the bus bars may be formed of members of different materials. Further, the number of bus bars 200, the number of power storage elements 100 connected in parallel, the number of sets of power storage elements 100 connected in series, and the like are not limited to the above.

  Spacer 300 is a plate-shaped member arranged on the side (positive side or negative side in the X-axis direction) of power storage element 100 to insulate power storage element 100 from other members. For example, the spacer 300 is formed of an insulating resin such as PC, PP, PE, PPS, PBT, or ABS resin. That is, the spacer 300 is arranged between two adjacent power storage elements 100 and insulates the two power storage elements 100 from each other. In the present embodiment, 11 spacers 300 are arranged between each of the 12 storage elements 100. The spacer 300 may be formed of any material as long as it is a member having an insulating property, all may be formed of the same material, or any of the spacers may be formed of a different material. May be formed of the above member.

  The spacer 300 is formed so as to cover substantially half of the front side or back side of the power storage element 100 (substantially half when divided into two in the X-axis direction). That is, a concave portion is formed on both the front side and the rear side (both surfaces in the X-axis direction) of the spacer 300, and approximately half of the power storage device 100 is inserted into the concave portion. With such a configuration, the spacer 300 on the side of the power storage element 100 covers most of the power storage element 100, so that the spacer 300 provides an insulating property between the power storage element 100 and another conductive member. Can be improved.

  The spacer 300 has a spacer protrusion 310 that protrudes upward and engages with the holding member 30. Accordingly, even if the holding member 30 attempts to move upward, the upward movement of the holding member 30 is suppressed by the spacer protrusion 310 of the spacer 300.

  The holding member 400 and the restraining member 500 are members that press the power storage element 100 from the outside in the stacking direction of the electrode body of the power storage element 100. That is, the sandwiching member 400 and the restraining member 500 press the respective storage elements 100 included in the plurality of storage elements 100 from both sides by sandwiching the plurality of storage elements 100 from both sides in the stacking direction. Note that the lamination direction of the electrode body of the power storage element 100 is a direction in which the positive electrode, the negative electrode, and the separator of the electrode body are laminated, and is the same direction as the arrangement direction (X-axis direction) of the plurality of power storage elements 100. That is, the plurality of power storage elements 100 are arranged in the stacking direction.

  Specifically, the sandwiching member 400 is a flat plate-shaped member (end plate) arranged on both sides of the plurality of power storage elements 100 in the X-axis direction, and holds the plurality of power storage elements 100 and the plurality of spacers 300 by the plurality of power storage elements. The element 100 and the plurality of spacers 300 are sandwiched and held from both sides in the arrangement direction (X-axis direction). The holding member 400 is formed of a metal (conductive) member such as steel or stainless steel from the viewpoint of strength or the like, but is not limited thereto. For example, the holding member 400 is formed of a high-strength insulating member. You may. When the holding member 400 is formed of a conductive member, in order to ensure insulation between the holding member 400 and the power storage element 100, between the holding member 400 and the power storage element 100, An insulating member similar to the spacer 300 is disposed.

  The restraining member 500 is a long and flat member (restraining bar) that has both ends attached to the sandwiching member 400 and restrains the plurality of power storage elements 100. That is, the restraining member 500 is disposed so as to straddle the plurality of power storage elements 100 and the plurality of spacers 300, and restrains the plurality of power storage elements 100 and the plurality of spacers 300 in the arrangement direction (X-axis direction). Give power.

  In the present embodiment, two restraining members 500 are arranged on both sides (both sides in the Y-axis direction) of the plurality of power storage elements 100, and the plurality of power storage elements 100 are separated by the two restraining members 500 from the both sides. Hold and restrain. Note that, like the holding member 400, the restraining member 500 is preferably formed of a metal member such as steel or stainless steel, but may be formed of a member other than metal.

  The bus bar frame 600 is a member that can insulate the bus bar 200 from other members and regulate the position of the bus bar 200. In particular, bus bar frame 600 positions bus bar 200 with respect to a plurality of power storage elements 100 in power storage unit 20.

  Specifically, the bus bar frame 600 is placed above the plurality of power storage elements 100 (on the positive side in the Z-axis direction) and positioned with respect to the plurality of power storage elements 100. Further, the bus bar 200 is placed and positioned on the bus bar frame 600. As a result, the bus bar 200 is positioned with respect to the plurality of power storage devices 100, and each of the plurality of power storage devices 100 has the bus bar opening 610 which is a through hole formed in the bus bar frame 600. It is joined to the electrode terminal.

  The bus bar frame 600 is formed of an insulating resin material such as PC, PP, PE, PPS, PBT, or ABS resin, but may be formed of any material having an insulating property. It doesn't matter. However, in the present embodiment, busbar frame 600 is made of a material having relatively high rigidity (a material having higher rigidity than holding member 30) in order to secure the function of fixing holding member 30 to power storage element 100. Is preferably formed.

  The heat shield plate 700 is a heat-insulating plate-shaped member disposed inside the exhaust passage of the safety valve 105 of each power storage element 100. Specifically, heat shield plate 700 is arranged above bus bar frame 600 so as to be located above the safety valve of each storage element 100. In the present embodiment, the safety valves 105 of each of the plurality of power storage elements 100 are arranged on a straight line along the X-axis direction, and the heat shield plate 700 is located above each safety valve 105, and is located in the X-axis direction. It has a long shape.

  The heat shield plate 700 protects an electric device such as a circuit board disposed above the power storage unit 20 from heat of the gas when the gas is discharged from the safety valve of the power storage element 100 at the time of abnormality, for example. Further, the exterior body 10 is provided with a through-hole (described later with reference to FIG. 5 and the like) communicating between the inside and the outside of the exterior body 10. Guided outside body 10.

  In this embodiment, the heat shield plate 700 is formed of a metal material such as stainless steel having low heat conductivity, but is not limited to this. Any material having high heat resistance and low heat conductivity can be used. For example, it may be made of a resin such as PPS or PBT reinforced with glass fiber, or a ceramic or the like.

  A structure for discharging gas released from one or more power storage elements 100 to the outside of the exterior body 10 in the power storage device 1 configured as described above will be described with reference to FIGS.

  FIG. 4 is an exploded perspective view illustrating a configuration outline of the exterior body 10 according to the embodiment. Specifically, in FIG. 4, the exterior body 10 is separated into a lid 11 and a container 12, and the lid 11 is further illustrated as being separated into a lower lid 11a and an upper lid 11b. Further, illustration of other elements such as a plurality of power storage elements 100 housed inside the exterior body 10 is omitted.

  FIG. 5 is a partially enlarged perspective view showing the outline of the configuration of the ventilation chamber 60 included in the exterior body 10 according to the embodiment, and FIG. 6 is a plan view corresponding to FIG. 5 and 6, the illustration of the upper lid 11b is omitted, and the first member 91 and the second member 92 are shown separately from the ventilation chamber 60. In FIG. 6, the area penetrating the lower lid 11a is indicated by dots so that it can be easily distinguished from other elements.

  As shown in FIGS. 4 to 6, exterior body 10 according to the present embodiment is provided with ventilation chamber 60 for communicating the inside and exterior of exterior body 10. The ventilation chamber 60 is disposed between a front wall 63 having a through hole 70 communicating with the outside, a rear wall 64 disposed at a position facing the front wall 63, and between the through hole 70 and the rear wall 64. It has a first wall 65 and a side wall 68 b extending along a first direction intersecting with the front wall 63 and arranged with a gap 67 between the first wall 65 and the first wall 65.

  Note that, in the present embodiment, the front wall 63 is arranged in a posture parallel to the Y-axis direction, and the first direction coincides with the X-axis direction. In the present embodiment, for example, as shown in FIG. 6, a gap 67 (indicated by a bold dotted line in FIG. 6) is formed from the front wall 63 to the back wall 64 along the first direction. Have been. The gap 67 is a linear space as a whole, through which the fluid can pass, and can be called a fluid passage or a fluid straight path.

  In this embodiment, as shown in FIGS. 5 and 6, the ventilation chamber 60 has three side walls (side walls 68a, 68b, 68c) extending in the X-axis direction and arranged in the Y-axis direction. Are provided, and the side walls 68a and 68c at both ends in the Y-axis direction are walls at both ends of the ventilation chamber 60 in the Y-axis direction. The bottom surface 69 (part of the lower lid 11a) and the upper lid 11b are walls of the ventilation chamber 60 in the Z-axis direction (vertical direction). That is, the ventilation chamber 60 is a space for ventilation (ventilation space) surrounded by the side walls 68a and 68c, the front wall 63, the back wall 64, the bottom surface 69, and the upper lid 11b.

  In addition, it can be said that each of the front wall 63 and the back wall 64 is a side wall (that is, a side wall) in the X-axis direction in the ventilation chamber 60.

  In such a configuration, the ventilation chamber 60 is provided with an opening communicating with the outside of the exterior body 10. Specifically, the ventilation chamber 60 is provided with a first opening 81 and a second opening 82, and each of the first opening 81 and the second opening 82 is It communicates with the outside of the exterior body 10.

  That is, power storage device 1 according to the present embodiment includes exterior body 10 having first opening 81 and second opening 82, each of which communicates with the outside. The power storage device 1 further covers the first opening, covers the first member 91 having waterproofness and air permeability, and covers the second opening 82, and when the pressure inside the exterior body 10 exceeds a predetermined pressure. , A second member 92 for releasing the internal pressure.

  The power storage device 1 can also be expressed as follows. The power storage device 1 includes an exterior body 10 having a lid 11 and a container 12, wherein the lid 11 includes a lower lid 11a covering an opening 12a of the container 12, an upper lid 11b provided on the lower lid 11a, a lower lid 11a, And a side wall such as a side wall 68a connecting the upper lid 11b. A ventilation chamber 60 is formed by the side walls such as the lower lid 11a, the upper lid 11b, and the side wall 68a, and a through hole 70 that communicates the outside with the ventilation chamber 60 is formed in one side wall. The lower lid 11a covers the first opening 81 and the second opening 82 that communicate the space inside the container 12 and the 60 ventilation chamber 60, and the first member that covers the first opening 81 and has waterproofness and air permeability. 91, and a second member 92 that covers the second opening 82 and releases the internal pressure when the internal pressure of the exterior body 10 exceeds a predetermined pressure.

  As described above, the exterior body 10 has two openings (the first opening 81 and the second opening 82), and each opening has a member having a different function (the first member 91 and the second member 82). By arranging the two members 92), the respective openings can have different functions. In the present embodiment, in brief, the first opening 81 allows the gas to be vented from the exterior body 10 during normal times, and the second opening 82 allows the gas to escape from the exterior body 10 during emergency (emergency). Degassing is performed. In addition, the first opening 81 functions not only as an exhaust from the inside of the exterior body 10 to the outside but also as an opening for taking in (intake) gas from the outside to the inside of the exterior body 10. That is, the first opening 81 has a function of reducing a pressure difference between the inside and outside of the exterior body 10 in a normal state (pressure equilibrium function).

  When two members having different functions are arranged side by side in one opening, the structure or the manufacturing process may be complicated, for example, in order not to create a gap between the two members. However, in the present embodiment, a member for closing each of the first opening 81 and the second opening 82 is arranged, so that the above-described normal degassing function, pressure balancing function, and emergency (emergency) ) Is provided in power storage device 1 with a relatively simple structure or manufacturing process.

  Specifically, in the present embodiment, the first member 91 is a sheet-shaped member, and more specifically, is a membrane (a gas-permeable waterproof membrane) having a function of allowing gas to pass therethrough and not allowing liquid to pass therethrough. is there. The first member 91 is a membrane made of a waterproof and breathable material having waterproof and breathable (breathable) such as Gore-Tex (registered trademark) and TEMISH (registered trademark).

  In the present embodiment, the second member 92 is a sheet-shaped member, and more specifically, is a film having a function of preventing gas and liquid from passing therethrough. The second member 92 is a member that releases (decompresses) the pressure when the pressure inside the exterior body 10 exceeds a predetermined pressure. As a material of the second member 92, for example, a resin film, a metal foil, or the like is employed.

  The sheet-shaped first member 91 is joined to the periphery of the first opening 81, and the sheet-shaped second member 92 is joined to the periphery of the second opening 82. For this bonding, for example, an adhesive, a pressure-sensitive adhesive, a double-sided pressure-sensitive adhesive tape, or the like can be used. This joining may be performed by welding. Therefore, each of the first member 91 and the second member 92 can be relatively easily arranged.

  As described above, in the power storage device 1 according to the present embodiment, the pressure difference between the inside and the outside of the exterior body 10 in the normal state is such that the pressure difference between the first opening 81 and the through-hole 70 (the plurality of through-holes 70 in the present embodiment). Reduced by the ingress and egress of gas through. Further, when the internal pressure of the exterior body 10 rises rapidly, for example, when gas is blown out from the safety valve 105 of any of the electric storage elements 100, the second member 92 may come off so as to open the second opening 82. Thus, the increased internal pressure of the exterior body 10 is reduced. As a result, for example, destruction of the exterior body 10 due to an excessive increase in the internal pressure of the exterior body 10 is prevented.

  In the present embodiment, as shown in FIG. 6, the second member 92 is connected to the opening valve portion 92a joined to the periphery of the second opening 82, and is connected to the opening valve portion 92a. A fixing portion 92b fixed to an outer portion.

  That is, the opening valve portion 92a is a portion that directly receives the internal pressure of the exterior body 10, and when the internal pressure of the exterior body 10 exceeds a predetermined internal pressure, the opening valve portion 92a is moved from the periphery of the second opening 82 to the outside. As a result, the internal pressure of the exterior body 10 is reduced. Further, in this case, since the pressure acting on the opening valve portion 92a in the direction in which the opening valve portion 92a is peeled is almost eliminated, the state in which the fixing portion 92b is fixed to a portion outside the peripheral edge is maintained.

  Therefore, even if the opening valve portion 92a comes off to open the second opening 82 due to, for example, a sudden rise in the internal pressure of the exterior body 10, the second member 92 remains at a predetermined position by the fixing portion 92b. In the position. Thereby, the possibility that the second member 92 may hinder the release of gas from the inside of the exterior body 10 to the outside, for example, is reduced.

  Note that the attachment strength of the second member 92 to the second opening 82 may be lower than the attachment strength of the first member 91 to the first opening 81. In this case, the second member 92 is easily detached from the second opening 82 because of a low attachment strength. Therefore, when the internal pressure of the exterior body 10 increases rapidly, the effectiveness of the second member 92 having a function of releasing the internal pressure is improved.

  The mounting strength of each of the first member 91 and the second member 92 may be determined, for example, by the amount and type of the adhesive to be bonded to the exterior body 10 and the application in plan view (the same applies when viewed from the positive side in the Z-axis direction). It can be adjusted by changing the area or the application position. For example, the joining of the first member 91 to the periphery of the first opening 81 (first joining) and the joining of the second member 92 to the periphery of the second opening 82 (second joining) are the same type. It is assumed that the process is performed using an adhesive of the following type. In this case, the amount of the adhesive used for the second bonding is made smaller than the amount of the adhesive used for the first bonding. Thereby, the attachment strength of the second member 92 to the second opening 82 is lower than the attachment strength of the first member 91 to the first opening 81.

  Further, for example, when each of the first member 91 and the second member 92 is joined to the exterior body 10 by welding, the first member 91 and the second member 92 are respectively changed by changing a welding area or a welding position in a plan view. It is also possible to adjust the mounting strength.

  As a method of comparing the mounting strength, for example, a tensile test on the first member 91 and the second member 92 is exemplified. In other words, the member connected to the first member 91 and the second member 92 by a method such as adhesion or suction is connected to the side where the first member 91 and the second member 92 are joined (in the present embodiment, the positive side in the Z-axis direction). ). As a result, it can be determined that, of the first member 91 and the second member 92, the one detached from the exterior body 10 first has lower attachment strength. Also, by measuring and comparing the tension required for detaching the first member 91 and the second member 92, the mounting strength between the first member 91 and the second member 92 can be compared.

  Here, when the power storage device 1 is mounted on a machine or a device used outdoors, such as an automobile, water such as rainwater may reach the through-hole 70 provided in the ventilation chamber 60. . That is, water such as rainwater may flow into the ventilation chamber 60. In particular, when a machine or a device on which the power storage device 1 is mounted is exposed to severe wind and rain, there is a possibility that water may flow into the ventilation chamber 60 with a strong force.

  However, in the ventilation chamber 60 according to the present embodiment, since the first wall 65 is disposed on the inner side of the through hole 70 (inside the ventilation chamber 60), water flows in at a high speed from the through hole 70. Even so, the momentum is weakened by the first wall 65. As a result, the flow of water into the exterior body 10 (the space in which the electric storage element 100 and the like are accommodated) through the ventilation chamber 60 is suppressed.

  Further, even if the water flowing into the ventilation chamber 60 reaches the positions of the first opening 81 and the second opening 82, both the first member 91 and the second member 92 do not allow water to pass. Since it has the function, the inflow of water from the first opening 81 and the second opening 82 to the inside of the exterior body 10 is prevented.

  Here, for example, when water flowing into the ventilation chamber 60 from the outside is stored on the first member 91, the function of the first member 91 as a ventilation waterproof membrane may be impaired. Further, for example, when the second member 92 is immersed in water, the operation of the second member 92 (opening of the exterior body 10 when the internal pressure rises) may be inadequate.

  However, in the present embodiment, there is a gap 67 formed from the front wall 63 to the back wall 64 between the first wall 65 and the side wall 68b. Direction) is formed. Thereby, even if water flows into the ventilation chamber 60, drainage from the ventilation chamber 60 is promoted. As a result, it is possible to reduce the possibility of occurrence of a problem caused by the accumulation of water in the ventilation chamber 60.

  Further, the ventilation chamber 60 has a simple structure basically composed of a plurality of walls, so that the resistance to the inflowing water can be increased and the discharge of the inflowing water can be promoted. That is, since the ventilation chamber 60 allows the exhaust from the inside of the exterior body 10 to the outside, it allows the inflow of water from the outside to the inside of the ventilation chamber 60, while the comparatively simple structure allows The discharge of the inflowing water from the ventilation chamber 60 is promoted.

  In the present embodiment, the axis of the through-hole 70 (a virtual straight line passing through the center of the hole or the opening and parallel to the penetrating direction, the same applies hereinafter), the first opening 81 and the second opening 82 The following can be said by paying attention to this axis.

  The exterior body 10 is provided with a ventilation chamber 60 in which a first opening 81 and a second opening 82 and a through-hole 70 communicating with the outside are arranged. The first opening 81 and the second opening 82 are arranged at positions communicating with the outside via the through holes 70. In such a structure, the direction of the axis of the first opening 81 is the first axis direction, the direction of the axis of the second opening 82 is the second axis direction, and the direction of the axis of the through hole 70 is the third axis direction. And In this case, the first axis direction and the second axis direction intersect with the third axis direction.

  Specifically, in the present embodiment, the first axis direction and the second axis direction are both Z-axis directions, and the third axis direction is the X-axis direction. That is, the first axis direction and the second axis direction intersect with the third axis direction.

  Therefore, even if water flows in at a high speed from the through-hole 70, the direction of the axis of the through-hole 70 and the opening (the first opening in this embodiment) Since the directions of the axes of the opening 81 and the second opening 82 intersect with each other, the openings (in the present embodiment, the first opening 81 and the second opening 82) are structurally provided with the axis of the opening. The possibility of water coming from the direction is reduced. That is, the possibility that water comes to the opening from a direction that easily passes through the opening is reduced.

  It is sufficient that at least one of the first axis direction and the second axis direction intersects the third axis direction. Thereby, at least one of the first opening 81 and the second opening 82 corresponding to the at least one of them is reduced in the possibility that the water flowing into the ventilation chamber 60 comes from the axial direction.

  Further, it is not necessary that both the first opening 81 and the second opening 82 are disposed in the ventilation chamber 60, and one of the first opening 81 and the second opening 82 is It may be arranged in a part different from 60. Even in this case, the direction of the axis of the opening disposed in the ventilation chamber 60 (the first axis direction or the second axis direction) intersects with the direction of the axis of the through hole 70 (the third axis direction). By doing so, the possibility that water comes to the opening from the axial direction of the opening is reduced. An example of a structure in which one of the first opening 81 and the second opening 82 is disposed other than the ventilation chamber 60 will be described later as a fourth modification.

  Further, in the present embodiment, the ventilation chamber 60 further has a second wall 66 that is disposed between the first wall 65 and the back wall 64 and that forms a gap 67 with the side wall 68b.

  Thus, the provision of the second wall 66 in the ventilation chamber 60 further reduces the force of the water flowing from the through hole 70. In addition, since the gap 67 serving as a fluid passage exists between the side wall 68b and the second wall 66, good drainage is not impaired.

  More specifically, in the ventilation chamber 60, a plurality of second walls 66 are arranged in a first direction (X-axis direction). In the present embodiment, two second walls 66 are arranged between the first wall 65 and the back wall 64 in the X-axis direction. Further, each of the first wall 65 and the plurality of second walls 66 is arranged so as to be shifted in a direction intersecting the first direction (X-axis direction). Specifically, the three walls (the first wall 65 and the two second walls 66) are alternately arranged on the plus side and the minus side in the Y-axis direction. That is, in plan view, the first wall 65 and the two second walls 66 are arranged in a zigzag manner, and a fluid straight path (gap 67) is secured.

  That is, in the present embodiment, three walls that are resistant to water flowing into the ventilation chamber 60 from the outside are arranged, and each of the three walls arranged in the X-axis direction has a distance between the side wall 68b, for example. They are arranged alternately. That is, when the direction of the back wall 64 is viewed from the through hole 70 side, for example, the right end of one of the two walls adjacent to each other in the front-rear direction (the X-axis direction) is the right end of the other wall. It protrudes to the right from the end. In addition, for example, in terms of the positional relationship between the side wall and each wall, the distance between the plurality of walls adjacent in the X-axis direction to the side wall in the Y-axis direction varies. In the present embodiment, the first wall 65 and the two second walls 66 are arranged such that the distance from the side wall 68c is large, small, and large.

  Therefore, the behavior of the water flowing from the through hole 70 is described, for example, as follows. Most of the water flowing from the through hole 70 and colliding with the first wall 65 is a gap having a larger width between the left and right gaps of the first wall 65 (in the present embodiment, viewed from the through hole 70). At the time of the collision, but the momentum of the water becomes considerably small. Note that the force of the water flowing into the smaller gap (in the present embodiment, the gap on the right side when viewed from the through hole 70) is further reduced.

  The water that has flowed into the gap on the left side of the first wall 65 collides with the second wall 66 due to the presence of the second wall 66 on its traveling path, and the momentum is further reduced. In addition, most of the water that has collided with the second wall 66 is guided to the side of the left or right gap of the second wall 66 having the larger width (in the present embodiment, the gap on the right side when viewed from the through hole 70). I will As described above, the water flowing from the through-hole 70 roughly collides with the wall, proceeds to the larger one of the left and right gaps of the wall, collides with the wall located on the traveling path, Meandering to the left and right with the action of

  That is, the ventilation chamber 60 has a maze structure that forms a zigzag water flow path, and as a result, an effect (labyrinth effect) of efficiently reducing the momentum of the water flowing into the ventilation chamber 60 is achieved. You.

  In addition, it is not essential that the plurality of walls in the ventilation chamber 60 are arranged shifted in a direction intersecting with the first direction (X-axis direction). That is, for example, the center axes of the plurality of walls in the Y-axis direction may match. In this case, for example, even when the second wall 66 located at the back of the first wall 65 is formed at a position and size that are completely hidden by the first wall 65 when viewed from the side of the through hole 70. Good. Even in this case, after colliding with the first wall 65, at least a portion of the water that has flowed from the left or right of the first wall 65 to the back side (the side of the second wall 66) is reduced by the second wall 66. , The movement in the direction of the back wall 64 is hindered. Thereby, compared with the case where the second wall 66 is not disposed, the momentum of the water flowing into the ventilation chamber 60 can be further reduced.

  Further, from the viewpoint of suppressing the intrusion of water into the interior of the exterior body 10 through the ventilation chamber 60, when the second wall 66 located at the back of the first wall 65 is viewed from the side of the through hole 70, The first wall 65 is preferably formed at a position and size protruding from both the left and right sides. In this case, the water guided to the left and right gaps of the first wall 65 after colliding with the first wall 65 moves in the direction of the back wall 64 because the second wall 66 exists on the traveling path. Is hindered. Thereby, the momentum of the water that passes through the left and right sides of the first wall 65 can be efficiently reduced.

  In the ventilation chamber 60 according to the present embodiment, for example, as shown in FIG. 6, a gap is formed between the three walls and both the left and right side walls (side wall 68b and side wall 68c). Therefore, drainage of the water flowing into the ventilation chamber 60 is improved.

  In the present embodiment, as shown in FIGS. 5 and 6, the ventilation chamber 60 includes the first ventilation chamber 61 in which the first opening 81 and the second opening 82 are disposed, and the through-hole 70. And a second ventilation chamber 62 provided. Specifically, the ventilation chamber 60 is divided into a first ventilation chamber 61 and a second ventilation chamber 62 by a side wall 68b, and the side wall 68b is a flow of water from the second ventilation chamber 62 to the first ventilation chamber 61. It functions as a member that inhibits. Therefore, the possibility of reaching the first opening 81 and the second opening 82 with the water flowing from the through hole 70 is reduced. That is, the possibility of intrusion of water through the first opening 81 or the second opening 82 is reduced.

  5 and 6, there is a gap between the side wall 68b and the front wall 63. Therefore, for example, even when the water that has flowed in from the through hole 70 at a high speed reaches the first ventilation chamber 61 through the gap 67 between the side wall 68b and the first wall 65, the water flows in front of the side wall 68b. The gap with the wall 63 functions as a short circuit for drainage. That is, drainage from the first ventilation chamber 61 is performed efficiently.

  Note that both the first opening 81 and the second opening 82 do not need to be arranged in the first ventilation chamber 61. For example, one of the first opening 81 and the second opening 82 is The second ventilation chamber 62 or the exterior body 10 may be arranged at a position other than the ventilation chamber 60. In any case, the reach of the water flowing from the through hole 70 to at least one of the first opening 81 and the second opening 82 arranged in the first ventilation chamber 61 is reduced.

  Further, in the present embodiment, for example, as shown in FIGS. 5 and 6, the exterior body 10 further has the ventilation pipe 15 arranged outside the front wall 63 and communicating with the through hole 70.

  According to this configuration, the direction of the exhaust from the exterior body 10 is regulated in the axial direction of the ventilation pipe 15. Therefore, for example, a machine or a device on which the power storage device 1 is mounted is designed in consideration of the exhaust process. Becomes easier.

  Further, since the flow of water from the outside of the exterior body 10 toward the through hole 70 is regulated in the axial direction of the ventilation pipe 15, water flowing from the through hole 70 is formed between the first wall 65 and the side wall 68 b. It is possible to reduce the possibility of going to the formed gap 67. That is, the effectiveness of the first wall 65 as a member that obstructs the flow of water flowing from the outside is enhanced.

  Further, as shown in FIG. 5, for example, a mesh portion 75 forming a plurality of through holes 70 is provided on a front wall 63 of the ventilation chamber 60. That is, each of the plurality of holes having a relatively small opening area of the mesh portion 75 functions as a through hole 70 for ventilation. Therefore, entry of a relatively large foreign object through the through hole 70 is suppressed.

  The mesh portion 75 may be formed integrally with the front wall 63, for example, in a step of forming the front wall 63. A plurality of through holes may be formed in the front wall 63 by disposing the separate mesh part 75.

  Here, in the present embodiment, the ventilation chamber 60 has two openings (the first opening 81 and the second opening 82) communicating with the inside of the exterior body 10, but any of the openings is provided. , Are arranged at positions not overlapping with the gap 67 in plan view.

  Therefore, the possibility that the water flowing into the ventilation chamber 60 flows into the space where the electric storage element 100 and the like are arranged inside the exterior body 10 through the first opening 81 and the second opening 82 is reduced. Is done.

  Further, in the present embodiment, the ventilation chamber 60 has both the first opening 81 and the second opening 82, and in the ventilation chamber 60, the first member 91 is larger than the second member 92 in the through hole. It is arranged at a position far from 70. More specifically, in the path length of the fluid, the distance from the through hole 70 closest to one of the first member 91 and the second member 92 among the plurality of through holes 70 to the first member 91. However, it is longer than the distance from the through hole 70 to the second member 92.

  Therefore, for example, the water that has flowed into the ventilation chamber 60 from the outside via the through-hole 70 does not easily reach the first member 91. As a result, the possibility of water flowing into the exterior body 10 from the first opening 81 is reduced. Specifically, for example, the possibility of occurrence of water leakage or the like through the first member 91 due to the first member 91 being soaked in water is reduced.

  In addition, the bottom surface 69 of the ventilation chamber 60 according to the present embodiment has a height difference at least in part, so that the water flowing into the ventilation chamber 60 can be efficiently discharged. This will be described with reference to FIGS.

  FIG. 7 is a first cross-sectional perspective view showing the internal structure of the ventilation chamber 60 according to the embodiment, and FIG. 8 is a second cross-sectional perspective view showing the internal structure of the ventilation chamber 60 according to the embodiment. is there. Specifically, FIG. 7 is a diagram illustrating the ventilation chamber 60 cut along a plane parallel to the YZ plane, and FIG. 8 is a diagram illustrating the ventilation chamber 60 cut along a plane parallel to the XZ plane. It is. 7 and 8, the illustration of the container 12 of the exterior body 10 is omitted.

  In the present embodiment, as shown in FIGS. 7 and 8, at least a part of the bottom surface 69 of the ventilation chamber 60 has a height difference such that the through hole 70 side is low. Thereby, for example, the water flowing into the ventilation chamber 60 is more efficiently discharged from the through-hole 70 (the drainage from the ventilation chamber 60).

  Specifically, as shown in FIG. 7, the bottom surface 69 of the first ventilation chamber 61 in which the first opening 81 and the second opening 82 are formed is the second ventilation chamber in which the through hole 70 is formed. It inclines so that it may become low toward 62. Therefore, the water flowing into the first ventilation chamber 61 is easily returned to the second ventilation chamber 62, and as a result, drainage through the through-hole 70 formed in the second ventilation chamber 62 is promoted.

  As shown in FIG. 8, a part of the second ventilation chamber 62 in which the through hole 70 is formed is inclined so as to become lower toward the front wall 63 in which the through hole 70 is formed. Therefore, the water flowing into the second ventilation chamber 62 from the through hole 70 and the water returning from the first ventilation chamber 61 easily reach the front wall 63, and as a result, the penetration formed in the front wall 63. Drainage through the holes 70 is encouraged.

  In the present embodiment, the mesh portion 75 forming the plurality of through-holes 70 also has the through-hole 70 at the height of the bottom surface 69 as shown in FIG. Most of the water flowing into the ventilation chamber 60 can be discharged.

  Further, focusing on the height positions of the first member 91 and the second member 92, the following features are provided. That is, the ventilation chamber 60 has both the first opening 81 and the second opening 82 and is located above the bottom surface of the exterior body 10. , Is located above the second member 92. Specifically, as shown in FIG. 7, the first opening 81 is located at a position higher than the second opening 82 (the positive side in the Z-axis direction), and The one member 91 is arranged at a position higher than the second member 92 that closes the second opening 82.

  Accordingly, in a general posture when the power storage device 1 is used, the first member 91 having higher air permeability than the second member 92 exists at a relatively high position. Therefore, for example, even when external water flows into the ventilation chamber 60, the possibility of occurrence of water leakage or the like through the first member 91 due to the first member 91 being soaked in water is reduced.

  In addition, the power storage device 1 has a ventilation structure different from the ventilation chamber 60 shown in FIGS. 4 to 8 as a structure (venting structure) for ventilation from one of the inside and the outside of the exterior body 10 to the other. Is also good. Therefore, hereinafter, a modified example regarding the ventilation structure of the exterior body 10 according to the embodiment will be described focusing on differences from the above-described embodiment.

(Modification 1)
FIG. 9 is a cross-sectional view schematically illustrating the ventilation structure of power storage device 1a according to Modification 1 of the embodiment. Note that FIG. 9 illustrates a state where the exterior body 10a included in the power storage device 1a is cut along a plane parallel to the XY plane at the position of the ventilation structure including the first opening 81, the second opening 82, and the like. . Further, the shape of the exterior body 10a is shown in a simplified manner so as to show its characteristics, and the illustration of the holding member 30, the bus bar 41, and the like is omitted. These supplementary items regarding FIG. 9 also apply to FIGS. 10 to 13 described below.

  The power storage device 1a illustrated in FIG. 9 includes an exterior body 10a having a first opening 81 and a second opening 82, each of which communicates with the outside. The power storage device 1a further covers the first opening, covers the first member 91 having waterproofness and air permeability, and covers the second opening 82, and when the pressure inside the exterior body 10a exceeds a predetermined pressure. , A second member 92 for releasing the internal pressure. That is, the power storage device 1a according to the present modification has the above structure in common with the power storage device 1 according to the embodiment.

  However, the power storage device 1a according to the present modification does not have a component that can be clearly distinguished from other portions, such as a ventilating room (ventilating space).

  Even in this case, the first member 91, which is a ventilation waterproof film, is disposed in the first opening 81 of the exterior body 10a, and gas and liquid are supplied to the second opening 82 of the exterior body 10a. By arranging the second member 92 that does not pass through, each opening can have a different function. Specifically, degassing from the exterior body 10a and pressure equilibrium between the interior and exterior of the exterior body 10a are normally performed by the first opening 81, and the exterior body in an emergency (emergency) is established by the second opening 82. Degassing from 10a is performed.

  Also, compared to the case where two members having different functions are arranged side by side in one opening, the internal pressure control function in the normal state and in the emergency (emergency) is relatively simple in structure or manufacturing. In the process, the power storage device 1a is provided.

(Modification 2)
FIG. 10 is a cross-sectional view schematically illustrating the ventilation structure of power storage device 1b according to Modification 2 of the embodiment. In power storage device 1b shown in FIG. 10, exterior body 10b is provided with ventilation chamber 60a in which first opening 81 and second opening 82 and through hole 70 communicating with the outside are arranged. The first opening 81 and the second opening 82 are arranged at positions communicating with the outside via the through holes 70. In this structure, the direction of the axis (first axis 81 a) of the first opening 81 is defined as the first axis direction, the direction of the axis (second axis 82 a) of the second opening 82 is defined as the second axis direction, and the through hole is formed. The direction of the axis 70 (third axis 70a) is defined as a third axis direction. In this modification, the first axis direction and the second axis direction are both Z-axis directions, and the third axis direction is the X-axis direction. In this case, the first axis direction and the second axis direction intersect with the third axis direction. That is, the power storage device 1b according to the present modification has the above structure in common with the power storage device 1 according to the embodiment.

  However, in the power storage device 1b according to the present modification, no wall such as the first wall 65 and the second wall 66 is arranged in the ventilation chamber 60a. Even in this case, the direction of the axis of the through hole 70 intersects with the direction of the axis of the openings (the first opening 81 and the second opening 82 in the present modification) arranged in the ventilation chamber 60a. Therefore, even if water flows in at a high speed from the through-hole 70, the possibility that water comes to the opening from the axial direction of the opening is reduced structurally.

  In the present modification, each of the first axis direction and the second axis direction has a relationship of 90 ° with the third axis direction, but this is not essential. For example, it is assumed that the first axis direction and the third axis direction are not parallel and the angle between the first axis direction and the third axis direction is not 90 °. Even in this case, since the first axis direction and the third axis direction intersect, even if water flows in at a high speed from the through hole 70, the water flows into the first opening 81 from the first axis direction. Is reduced.

(Modification 3)
FIG. 11 is a cross-sectional view schematically illustrating the ventilation structure of power storage device 1c according to Modification 3 of the embodiment. In power storage device 1c shown in FIG. 11, exterior body 10c is provided with ventilation chamber 60b in which first opening 81 and second opening 82 and through-hole 70 communicating with the outside are arranged. Further, the first opening 81 and the second opening 82 are arranged at positions communicating with the outside via the through holes 70. That is, the power storage device 1c according to the present modification has the same structure as the power storage device 1 according to the above embodiment.

  However, in the power storage device 1c according to this modification, the first axis 81a and the second axis 82a that are the axes of the first opening 81 and the second opening 82 are different from the third axis 70a that is the axis of the through-hole 70. Parallel. That is, as shown in FIG. 11, each of the first axis 81a and the second axis 82a is parallel to the X-axis direction similarly to the third axis 70a, and is in parallel with each of the first axis 81a and the second axis 82a. , Does not overlap with the third axis 70a in the three-dimensional space. In this respect, power storage device 1 according to the above embodiment is different.

  According to this configuration, even when water flows in at a high speed from the through-hole 70, the third axis 70a, the axis, the first axis 81a, and the second axis 82a do not overlap. The possibility that water will come to the one opening 81 and the second opening 82 from the axial direction of the opening is reduced.

  Note that at least one of the first axis 81a and the second axis 82a may be in a relationship parallel to the third axis 70a. Thus, for at least one of the first opening 81 and the second opening 82 corresponding to the at least one, the possibility that the water flowing from the through-hole 70 comes in the axial direction is reduced.

  Further, one of the first opening 81 and the second opening 82 may be arranged at a position different from the ventilation chamber 60b of the exterior body 10c. Even in this case, since the axis (the first axis 81a or the second axis 82a) of the opening disposed in the ventilation chamber 60b is parallel to the third axis 70a of the through-hole 70, The possibility of water coming from the axial direction is reduced.

  In addition, in FIG. 11, the back wall 64 in which the first opening 81 and the second opening 82 are arranged may have a convex shape on the plus side or the minus side in the X-axis direction. In this case, when the first axis 81a and the second axis 82a are inclined, for example, in the XY plane, the direction of the first axis 81a (first axis direction) and the direction of the second axis 82a (second axis direction) It intersects the direction of the third axis 70a (third axis direction). Therefore, as described in the second modification, even if water flows at a high speed from the through-hole 70, the first opening 81 and the second opening 82 are structurally provided with the respective openings. The possibility of water coming from the axial direction is reduced.

(Modification 4)
FIG. 12 is a cross-sectional view schematically illustrating a ventilation structure of a power storage device 1d according to Modification 4 of the embodiment. In the power storage device 1d illustrated in FIG. 12, a first opening 81 and a second opening 82 and a through hole 70 that communicates with the outside are provided in the exterior body 10d. Further, the first opening 81 and the through hole 70 are arranged in the ventilation chamber 60c of the exterior body 10d. That is, the power storage device 1d according to the present modification has the same structure as the power storage device 1 according to the above-described embodiment.

  However, in the power storage device 1d according to the present modification, the second opening 82 is not disposed in the ventilation chamber 60c, but is disposed on one side wall of the exterior body 10d. Even in this case, the direction of the third axis 70a of the through hole 70 (third axis direction) and the direction of the first axis 81a of the first opening 81 disposed in the ventilation chamber 60c (first axis direction). Therefore, even if water flows at a high speed from the through-hole 70, the possibility of water coming from the first axial direction to the first opening 81 is reduced structurally.

  Note that the first opening 81 may be arranged in the ventilation chamber 60c such that the first axis 81a is parallel to the third axis 70a, as in the third modification. Even in this case, the possibility that water will come to the first opening 81 from the first axial direction is reduced.

  Further, the second opening 82 may be arranged in the ventilation chamber 60c, and the first opening 81 may be arranged in a portion other than the ventilation chamber 60c of the exterior body 10d. In this case, by arranging the second opening 82 so that the direction of the second axis 82a (second axis direction) and the third axis direction intersect, the water flowing from the through-hole 70 is The possibility of coming to the opening 82 from the second axial direction is reduced. Further, as in the third modification, the second opening 82 is arranged in the ventilation chamber 60c so that the second axis 82a is parallel to the third axis 70a, so that the second opening 82 The possibility of water coming from the axial direction is reduced.

  Here, for example, it is considered that the first member 91 is a breathable waterproof film having air permeability, and the second member 92 is a member that does not have air permeability (or has a lower air permeability than the first member 91). Then, it can be said that arranging the first opening portion 81 (and the first member 91) in the ventilation chamber 60c is more advantageous from the viewpoint of reducing the possibility of external water entering the exterior body 10d.

  On the other hand, for example, considering that the hot gas is discharged from the second opening 82, the second opening 82 (and the second member 92) is reduced from the viewpoint of reducing the heat and the heat of the hot gas. ) May be more advantageously arranged in the ventilation chamber 60c.

  Further, in this modification, the through hole 70 and the second opening 82 are arranged on the same side wall of the exterior body 10d, but the through hole 70 and the second opening 82 are formed on different side walls. It may be arranged. For example, the arrangement position of the second opening 82 in the exterior body 10d may be determined according to the position where a component or a structure for processing the high-heat gas ejected from the second opening 82 is arranged.

(Modification 5)
FIG. 13 is a cross-sectional view schematically illustrating the ventilation structure of power storage device 1e according to Modification 5 of the embodiment.

  In the power storage device 1e shown in FIG. 13, the exterior body 10e is provided with a ventilation chamber 60d in which a first opening 81, a second opening 82, and a through hole 70 communicating with the outside are arranged. The first opening 81 and the second opening 82 are arranged at positions communicating with the outside via the through holes 70. That is, the power storage device 1e according to the present modification has the same structure as the power storage device 1 according to the embodiment in the above structure.

  However, in the power storage device 1e according to the present modification, only the first wall 65 is provided between the through hole 70 and the back wall 64. That is, no wall such as the second wall 66 is disposed between the first wall 65 and the back wall 64. Further, in the present modification, the exterior body 10e is not provided with the mesh portion 75 for forming the plurality of through holes 70, and only one through hole 70 is formed. Even in this case, since the first wall 65 is disposed behind the through hole 70 (inside the exterior body 10e), the water flowing from the through hole 70 may collide with the first wall 65. The momentum is weakened. As a result, the possibility that the water flowing from the through hole 70 reaches the openings (the first opening 81 and the second opening 82 in the present modification) arranged in the ventilation chamber 60d is reduced.

  In the present modification, the exterior body 10e has a side wall 68b extending along the first direction (X-axis direction) intersecting the front wall 68. Between the side wall 68b and the first wall 65, a gap 67 (indicated by a thick dotted line in FIG. 13) extends from the front wall 63 to the back wall 64 along the first direction (X-axis direction). The gap 67 forms a fluid passage along the first direction (X-axis direction). Thus, even if water flows into the ventilation chamber 60d, drainage from the ventilation chamber 60d is promoted. As a result, the possibility of occurrence of a trouble due to the accumulation of water in the ventilation chamber 60d is reduced.

(Other embodiments)
As described above, the power storage device according to the embodiment of the present invention and the modification thereof have been described, but the present invention is not limited to the above embodiment and the modification thereof. In other words, the embodiments and modifications thereof disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. Further, a mode in which each of the components included in the above-described embodiment and its modified examples is arbitrarily combined is also included in the scope of the present invention.

  For example, in the ventilation chamber 60 according to the above-described embodiment, the gap 67 formed from the front wall 63 to the back wall 64 along the first direction (X-axis direction) is different from the first wall 65 and the XZ plane. And a side wall 68b erected on the bottom surface 69 in a posture parallel to. However, the gap 67 forming the fluid passage may be formed between the first wall 65 and another side wall.

  For example, it can be said that a part of the lower lid 11a that forms the bottom surface 69 of the ventilation chamber 60 is a wall (side wall) located on the Z-axis direction minus side of the first wall 65. That is, even if there is a gap 67 formed from the front wall 63 to the back wall 64 along the first direction between the first wall 65 and the side wall forming the bottom surface 69 of the ventilation chamber 60. Good. That is, the gap 67 may be formed below the first wall 65 (the negative side in the Z-axis direction). In this case, for example, only a part of the first wall 65 is connected to the bottom surface 69, or the first wall 65 is connected to the side wall 68b or the top lid 11b, so that the first wall 65 is connected to the ventilation chamber. It can be fixed at a predetermined position within 60.

  In the present embodiment, for example, as shown in FIG. 6, a plurality of walls (one first wall 65 and two second walls 66) are connected to a side wall 68 c opposite to the first ventilation chamber 61. Between them, there is a gap formed from the front wall 63 to the back wall 64 along the first direction, but this gap is not essential. For example, at least one of the one first wall 65 and the two second walls 66 may be connected to the side wall 68c. That is, there is a gap between the first wall 65 and at least one of the left, right, and lower side walls under the first wall 65 from the front wall 63 to the back wall 64 along the first direction. Is formed, an effect that the drainage from the ventilation chamber 60 is promoted by the gap can be obtained.

  Further, the side wall of the first wall 65 may form a curved surface instead of a flat surface. For example, the internal shape of the ventilation chamber 60 may be, for example, a tube shape having a tube axis parallel to the first direction. In this case, since a gap is formed between the first wall 65 and the side wall forming the curved surface from the front wall 63 to the back wall 64 along the first direction, the drainage from the ventilation chamber 60 is performed. Is promoted.

  Further, if the gap 67 forms a straight path along the first direction as a whole, the fluid passing through the gap 67 can be efficiently discharged. Therefore, for example, even when there is a protrusion on the side wall 68b that hinders the movement of the fluid, there is a portion where the protrusion and the first wall 65 do not overlap when viewed from the first direction. For example, a straight path of the fluid formed from the front wall 63 to the back wall 64 exists at least in part between the first wall 65 and the side wall 68b.

  For example, when the first wall 65 is disposed so as to face one through-hole 70, if the first wall 65 is disposed at a position blocking the center of the through-hole 70, foreign matter such as water flowing from the through-hole 70 may be prevented. The momentum can be efficiently reduced. Further, when the first wall 65 is disposed in the ventilation chamber 60 in which the plurality of through holes 70 are formed as in the above-described embodiment, the first wall 65 is located at a position blocking the center of the distribution area of the plurality of through holes 70. It is only necessary that the wall 65 is arranged. Thereby, the momentum of foreign matter such as water flowing from the plurality of through holes 70 can be efficiently reduced.

  In addition, when viewed from the first direction, the first wall 65 is disposed such that the first wall 65 exists in a range that covers all of the one or more through holes 70 of the ventilation chamber 60, and thus one or more The effect of reducing the momentum of foreign matter such as water flowing from the through hole 70 is further improved.

  In addition, the second member 92 is peeled from the peripheral edge of the second opening 82 to open the second opening 82, thereby suppressing an increase in the internal pressure of the exterior body 10. However, when the internal pressure of the exterior body 10 rises rapidly, the second member 92 opens the second opening 82 by, for example, breaking or being destroyed, thereby opening the exterior body 10. May be suppressed from increasing.

  Further, in the above embodiment, the first member 91 is disposed so as to cover the first opening 81 from the side opposite to the power storage device 100, and the second member 92 is formed of the second opening 82. It is arranged so as to cover from the opposite side to power storage element 100. Thus, in a situation where the external pressure of the exterior body 10 is higher than the internal pressure, the pressure difference causes the first member 91 to be pressed against the peripheral edge of the first opening 81 and the second member 92 to be pressed against the peripheral edge of the second opening 82. It works in the direction of pressing. Therefore, for example, when the external pressure of the exterior body 10 is higher than the internal pressure, there is an effect that it is unlikely that the first member 91 and the second member 92 will come off due to the differential pressure.

  However, the arrangement positions of the first member 91 and the second member 92 are not limited to this. For example, as described above, when the second member 92 is designed to be broken or broken when the internal pressure of the exterior body 10 suddenly increases, the second member 92 connects the second opening 82 to the power storage element. It may be arranged so as to cover from the side where 100 is arranged.

  Further, the present invention can be realized not only as such a power storage device, but also as an exterior body included in the power storage device.

  The present invention can be applied to a power storage device or the like including a power storage element and an exterior body that houses the power storage element.

1, 1a, 1b, 1c, 1d, 1e Power storage device 10, 10a, 10b, 10c, 10d, 10e Outer body 11 Lid 11a Lower lid 11b Upper lid 12 Container 12a Opening 13 Positive external terminal 14 Negative external terminal 15 Vent tube 20 Power storage Unit 30 Holding member 41, 42 Bus bar 60, 60a, 60b, 60c, 60d Ventilation room 61 First ventilation room 62 Second ventilation room 63 Front wall 64 Back wall 65 First wall 66 Second wall 67 Gap 68a, 68b, 68c Side wall 69 Bottom surface 70 Through hole 70a Third axis 75 Mesh portion 81 First opening 81a First axis 82 Second opening 82a Second axis 91 First member 92 Second member 92a Open valve portion 92b Fixed portion 100 Energy storage element 105 Safety valve 110 Case 120 Positive electrode terminal 130 Negative terminal 200 Bus bar 300 Spacer 31 0 Spacer protruding part 400 Holding member 500 Restraining member 600 Bus bar frame 610 Bus bar opening 700 Heat shield plate

Claims (9)

A power storage device including an exterior body and a power storage element housed inside the exterior body,
The exterior body is provided with a ventilation chamber that communicates the inside and the outside of the exterior body,
The ventilation chamber,
A front wall formed with a through hole communicating with the outside,
An inner wall arranged at a position facing the front wall,
A first wall disposed between the through hole and the back wall,
A side wall extending along a first direction intersecting the front wall, and arranged with a gap between the first wall and
The gap is formed over the back wall from the front wall along said first direction,
The first wall and the side wall are erected upward from a bottom surface of the ventilation chamber,
Power storage device. A power storage device including an exterior body and a power storage element housed inside the exterior body,
The exterior body is provided with a ventilation chamber that communicates the inside and the outside of the exterior body,
The ventilation chamber,
A front wall formed with a through hole communicating with the outside,
An inner wall arranged at a position facing the front wall,
A first wall disposed between the through hole and the back wall,
A pair of side walls extending along a first direction intersecting the front wall, between the first wall on both sides of the first wall in a direction intersecting the first direction. A pair of side walls arranged with a gap between them ,
Wherein each of said opposite sides of the gap of the first wall, is formed over the back wall from the front wall along said first direction,
Power storage device. A power storage device including an exterior body and a power storage element housed inside the exterior body,
The exterior body is provided with a ventilation chamber that communicates the inside and the outside of the exterior body,
The ventilation chamber,
A front wall formed with a through hole communicating with the outside,
An inner wall arranged at a position facing the front wall,
A first wall disposed between the through hole and the back wall,
A side wall extending along a first direction intersecting the front wall, and arranged with a gap between the first wall and
The gap is formed from the front wall to the back wall along the first direction,
The ventilation chamber further includes a second wall disposed between the first wall and the rear wall, and forming the gap between the first wall and the rear wall.
Power storage device. In the ventilation chamber, a plurality of the second walls are arranged side by side in the first direction,
4. The power storage device according to claim 3 , wherein each of the first wall and the plurality of second walls is arranged so as to be shifted in a direction intersecting with the first direction. 5. The power storage device according to any one of claims 1 to 4 , wherein at least a part of a bottom surface of the ventilation chamber has a height difference such that the through hole side is lower. The power storage device according to any one of claims 1 to 5 , wherein the exterior body further includes a ventilation pipe arranged outside the front wall and communicating with the through hole. Wherein the front wall, the power storage device according to any one of claims 1 to 6, mesh portion forming a plurality of the through-hole. A power storage device including an exterior body and a power storage element housed inside the exterior body,
The exterior body is provided with a ventilation chamber that communicates the inside and the outside of the exterior body,
The ventilation chamber,
A front wall formed with a through hole communicating with the outside,
An inner wall arranged at a position facing the front wall,
A first wall disposed between the through hole and the back wall,
A side wall extending along a first direction intersecting the front wall, and arranged with a gap between the first wall and
The gap is formed from the front wall to the back wall along the first direction,
The ventilation chamber further has an opening which is arranged at a position not overlapping with the gap in plan view and communicates with the inside of the exterior body.
Power storage device. The power storage device according to claim 8 , wherein the ventilation chamber further includes a ventilation waterproof film that covers the opening.

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