JP2017059502A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a short-circuit of electronic equipment due to dew condensation generated in an outer package.SOLUTION: A power storage device 1 comprises a power storage element 100 and an outer package 10. The power storage device 1 also includes electronic equipment (circuit board 99) provided in the outer package 10, and a housing part (first outer package 11) which houses the electronic equipment. A first inclined part (first wall body 951) arranged in a region covering the electronic equipment and approaches the electronic equipment as it heads to an edge of the region is formed on an upper wall surface 911 above the electronic equipment in the housing part.SELECTED DRAWING: Figure 7

Description

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

  Conventionally, a power storage device in which a plurality of power storage elements are housed in an exterior body is known. In addition, an electrical device such as a circuit board that performs electrical control of the power storage device is also housed in the exterior body (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2015-11956

  By the way, when the power storage device is used, dew condensation may occur inside the exterior body due to a temperature difference between the inside and the outside of the exterior body. If dew condensation touches an electrical device, the electrical device may be short-circuited.

  The objective of this invention is suppressing the short circuit of the electric equipment by the dew condensation which generate | occur | produces inside an exterior body.

  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 a power storage element and an exterior body, and includes an electrical device provided in the exterior body, and a housing portion that houses the electrical device; A first inclined portion is formed on the upper wall surface of the housing portion above the electrical device, in a region covering the electrical device, and closer to the electrical device toward the edge of the region.

  According to this, since the 1st inclination part which approaches an electric equipment is formed in the area | region which covers the electric equipment in the upper wall surface of a accommodating part, as it goes to the edge of the said area | region, dew condensation is carried out using the said 1st inclination part as a guide. Can be guided to a desired position. Therefore, it is possible to suppress the condensation from falling on the electric device, and to suppress a short circuit of the electric device.

  Moreover, the 1st inclination part is continuously provided from the said area | region to the external area | region adjacent to the said area | region, and you may decide that the external area side is lower than the said area | region side in a 1st inclination part.

  According to this, since the 1st inclination part is provided continuously to the outside field, dew condensation can be guided to the outside of an electric equipment. Therefore, it is possible to further suppress the condensation from falling on the electric device.

  Moreover, a 1st inclination part is a protrusion part which protruded toward the electric equipment side from the upper wall surface, and the protrusion part may be formed in elongate shape along the upper wall surface.

  According to this, since the first inclined portion is a long projecting portion, it is difficult for condensation to fall and the condensation is easily collected as droplets even when the upper wall surface is simply inclined. .

  A plurality of first inclined portions may be formed at intervals.

  According to this, since a plurality of first inclined portions are provided at intervals, dew condensation can be guided over a wide range.

  Moreover, you may decide to provide the 2nd inclination part which approaches an electric equipment, so that it goes to a 1st inclination part on the upper wall surface.

  According to this, since the 2nd inclination part which approaches an electric equipment is provided so that it goes to a 1st inclination part, dew condensation can be induced | guided | derived to a 1st inclination part by the said 2nd inclination part. Therefore, condensation can be easily induced to the first inclined portion.

  Further, the first inclined portion may be an inclined surface formed by inclining at least a part of the upper wall surface.

  According to this, since the first inclined portion is an inclined surface, it is possible to guide condensation to a desired position with a simple configuration.

  The upper wall surface may be a hydrophilic surface.

  According to this, since the upper wall surface is a hydrophilic surface, it is possible to suppress the condensation that has occurred on the upper wall surface from falling.

  According to the power storage device of the present invention, it is possible to suppress a short circuit of an electric device due to dew condensation occurring inside the exterior body.

It is a perspective view which shows the external appearance of the electrical storage apparatus which concerns on embodiment of this invention. It is a disassembled perspective view which shows each component at the time of decomposing | disassembling the electrical storage apparatus which concerns on embodiment of this invention. It is a disassembled perspective view which shows each component at the time of decomposing | disassembling the electrical storage unit which concerns on embodiment of this invention. It is a disassembled perspective view which shows schematic structure of the 1st exterior body which concerns on embodiment of this invention. It is a perspective view which shows schematic structure of the cover body which concerns on embodiment of this invention from the downward direction. It is a top view which shows schematic structure of the board | substrate installation area | region which concerns on embodiment of this invention. It is sectional drawing of the 1st exterior body at the time of cut | disconnecting by the YZ plane containing the VII-VII line in FIG. It is sectional drawing of the 1st exterior body at the time of cut | disconnecting by the ZX plane containing the VIII-VIII line in FIG. 10 is a cross-sectional view of a first exterior body according to Modification Example 1. FIG. 10 is a cross-sectional view of a first exterior body according to Modification Example 1. FIG.

  Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements. In each drawing, dimensions and the like are not strictly illustrated.

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

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

  In these figures, the Z-axis direction is shown as the vertical direction, and the Z-axis direction will be described below as the vertical direction. However, depending on the usage, the Z-axis direction may not be the vertical direction. The axial direction is not limited to the vertical direction. The same applies to the following drawings.

  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. In particular, power storage device 1 according to the present embodiment is preferably used as a starting battery for a moving body such as an automobile or a motorcycle. The power storage device 1 may be installed in a state where the exterior body 10 is exposed in a hood of a moving body or a trunk. As an example, power storage device 1 is used alone (single unit) without being connected to another power storage device (battery module). For example, in a mobile body (such as a truck) that consumes a large amount of power at startup, a plurality of power storage devices 1 may be connected in series. In this case, it is assumed that the plurality of power storage elements 1 are not integrated but are used alone (single unit). That is, power storage device 1 of the present embodiment may be different from a so-called pack battery in which a plurality of power storage devices are housed in a case and integrated.

  As shown in FIGS. 1 and 2, the power storage device 1 includes an exterior body 10 including a first exterior body 11 and a second exterior body 12, and an electrical storage unit 20 and a holding member housed inside the exterior body 10. 30, bus bars 41 and 42, a thermistor 50, and the like.

  The exterior body 10 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the power storage device 1, and can be communicated with the outside only in part and is almost sealed (semi-sealed state). Used in. That is, the exterior body 10 is disposed outside the power storage unit 20, the holding member 30, the bus bars 41 and 42, and the thermistor 50. The power storage unit 20 and the like are disposed at predetermined positions, and the power storage unit 20 and the like are protected from impact. Protect. 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. Yes. Thus, the outer package 10 avoids the storage unit 20 and the like from coming into contact with an external metal member or the like.

  Here, the exterior body 10 includes a first exterior body 11 constituting a lid body of the exterior body 10 and a second exterior body 12 constituting a main body of the exterior body 10. The first exterior body 11 is a flat rectangular cover member that closes the opening of the second exterior body 12, and is provided with a positive external terminal 13 and a negative external terminal 14. The power storage device 1 charges electricity from the outside via the positive electrode external terminal 13 and the negative electrode external terminal 14 and discharges electricity to the outside. The second exterior body 12 is a bottomed rectangular cylindrical housing having an opening, and houses the power storage unit 20, the holding member 30, the bus bars 41 and 42, the thermistor 50, and the like.

  In addition, the 1st exterior body 11 and the 2nd exterior body 12 may be formed with the member of the same material, and may be formed with the member of a different material.

  The specific configuration of the first exterior body 11 will be described later.

  The 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 a positive external terminal 13 provided on the first exterior body 11 It is electrically connected to the negative external terminal 14. That is, the positive electrode terminal of any one of the plurality of power storage elements 100 is electrically connected to the positive external terminal 13 via the bus bar 200. In addition, the negative electrode terminal of any one of the plurality of power storage elements 100 is electrically connected to the negative electrode external terminal 14 via the bus bar 200.

  The power storage units 20 are arranged in the second exterior body 12 in the X-axis direction in a state where the plurality of power storage elements 100 are placed vertically. The power storage unit 20 is housed inside the exterior body 10 by covering the first exterior body 11 from above. The detailed configuration of the power storage unit 20 will be described later.

  The holding member 30 is a member that holds the bus bars 41 and 42, can insulate the bus bars 41 and 42 from other members, and can regulate the position of the bus bars 41 and 42. In particular, the holding member 30 positions the bus bars 41 and 42 with respect to the bus bar 200, the positive external terminal 13, and the negative external terminal 14 in the power storage unit 20.

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

  The holding member 30 also has a function of holding the thermistor 50. That is, the holding member 30 is fixed in a state where the thermistor 50 is positioned with respect to the power storage element 100 and pressed against the power storage element 100 by attaching the thermistor 50.

  The holding member 30 is formed of an insulating resin material such as PC, PP, PE, PPS, PBT, or ABS resin. However, the holding member 30 is formed of any material as long as it is an insulating member. 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 in the first exterior body 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 external terminal 13, and the bus bar 42 is disposed at the other end in the power storage unit 20. This is a conductive member that electrically connects the bus bar 200 and the negative external terminal 14.

  The bus bars 41 and 42 are made 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 made of the same material, or may be formed of members made of different materials.

  The thermistor 50 is a temperature sensor attached to the power storage element 100. That is, the thermistor 50 is attached to the power storage element 100 and measures the temperature of the power storage element 100. In the present embodiment, two thermistors 50 are arranged for two power storage elements 100.

  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 of the present invention 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 plurality of spacers 310 and a pair of spacers 320), a pair of clamping members 400, and a plurality of The restraining member 500, the bus bar frame 600, and the heat shield plate 700 are provided.

  The power storage element 100 is a secondary battery (unit cell) that can charge and discharge electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. . The power storage element 100 has a flat rectangular shape and is disposed adjacent to the spacer 310. That is, each of the plurality of power storage elements 100 is alternately arranged with each of the plurality of spacers 310 and arranged in the X-axis direction. In the present embodiment, twelve power storage elements 100 are arranged adjacent to eleven spacers 310 alternately. In addition, the electrical storage element 100 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it.

  As shown in the figure, the electricity storage device 100 includes a container 110, a positive electrode terminal 120, and a negative electrode terminal 130. An electrode body (power generation element), a current collector (a positive electrode current collector and a negative electrode current collector), and the like are disposed inside the container 110, and a liquid such as an electrolytic solution (nonaqueous electrolyte) is enclosed therein. However, detailed description is omitted.

  The container 110 is composed of a casing main body having a rectangular cylindrical shape made of metal and having a bottom, and a metal lid that closes an opening of the casing main body. In addition, the container 110 can be hermetically sealed by welding the lid and the housing body after accommodating the electrode body and the like inside. As described above, the container 110 is a rectangular parallelepiped having a lid on the positive side in the Z-axis direction, a long side surface on the side surfaces on both sides in the X-axis direction, a short side surface on the side surfaces on both sides in the Y-axis direction, It is a container of shape. The material of the container 110 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, or aluminum alloy.

  The positive electrode terminal 120 is an electrode terminal electrically connected to the positive electrode of the electrode body through a positive electrode current collector, and the negative electrode terminal 130 is electrically connected to the negative electrode of the electrode body through a negative electrode current collector. These are connected electrode terminals, both of which are attached to the lid of the container 110. That is, the positive electrode terminal 120 and the negative electrode terminal 130 lead the electricity stored in the electrode body to the external space of the power storage element 100, and introduce electricity into the internal space of the power storage element 100 in order to store electricity in the electrode body. This is a metal electrode terminal. 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 bus bar that is electrically connected to each of the 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 electrode terminal included in the plurality of power storage elements 100, and any one of the electrode terminals included in the plurality of power storage elements 100 is electrically connected to each other. To do. Specifically, the bus bar 200 is disposed on the surface of each electrode terminal included in the plurality of power storage elements 100 and connected (joined) to the electrode terminal.

  In the present embodiment, five bus bars 200 are arranged, and twelve power storage elements 100 include four sets of three power storage elements 100 connected in parallel by the five bus bars 200. The configuration is 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 is thereby electrically connected to the positive external terminal 13 and the negative external terminal 14.

  The bus bar 200 is made of, for example, aluminum as a conductive member, but the material of the bus bar 200 is not particularly limited. Further, the bus bars 200 may all be formed of members of the same material, or any of the bus bars 200 may be formed of members of different materials.

  The spacer 300 includes a plurality of spacers 310 and a pair of spacers 320, and is formed of an insulating resin such as PC, PP, PE, PPS, PBT, or ABS resin. The spacers 310 and 320 may be formed of any material as long as they are insulating members, and all of them may be formed of members of the same material. It may be formed of a member of a different material.

  The spacer 310 is a plate-like member that is disposed on the side (X-axis direction plus side or minus side) of the electricity storage element 100 and insulates the electricity storage element 100 from other members. That is, the spacer 310 is disposed between two adjacent power storage elements 100 and insulates between the two power storage elements 100. In the present embodiment, eleven spacers 310 are arranged between each of the twelve power storage elements 100.

  In addition, the spacer 310 is formed so as to cover approximately half of the power storage element 100 on the front side or the back side (substantially half when divided into two in the X-axis direction). That is, a recess is formed on both the front side or the back side of the spacer 310 (both sides in the X-axis direction), and approximately half of the power storage element 100 is inserted into the recess. With such a configuration, the spacer 310 on the side of the power storage element 100 covers most of the power storage element 100, so that the insulating property between the power storage element 100 and another conductive member is covered by the spacer 310. Can be improved.

  The spacer 320 is a plate-like member that is disposed between the sandwiching member 400 and the exterior body 10 described later, and insulates between the sandwiching member 400 and the exterior body 10. The spacer 320 also has a function as a buffer member that protects the power storage unit 20 when an external impact is applied to the exterior body 10. In other words, the pair of spacers 320 are disposed between the pair of sandwiching members 400 and the exterior body 10 so as to sandwich the pair of sandwiching members 400 from both sides, and insulate the power storage element 100 and the like in the power storage unit 20. And protect from external impacts.

  The clamping 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 bodies of the power storage element 100. That is, the sandwiching member 400 and the restraining member 500 press the respective power storage elements 100 included in the plurality of power storage elements 100 from both sides by sandwiching the plurality of power storage elements 100 from both sides in the stacking direction. Note that the stacking direction of the electrode bodies 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 stacked, 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 clamping member 400 is a flat plate member (end plate) disposed on both sides in the X-axis direction of the plurality of power storage elements 100, and the plurality of power storage elements 100 and the plurality of spacers 310 are connected to the plurality of power storage elements. The element 100 and the plurality of spacers 310 are sandwiched and held from both sides in the arrangement direction (X-axis direction). The sandwiching member 400 is formed of a metal (conductive) member such as stainless steel or aluminum from the viewpoint of strength or the like, but is not limited thereto, and is formed of an insulating member having high strength, for example. May be.

  The restraining member 500 is a long and flat member (constraint bar) that is attached to the sandwiching member 400 at both ends 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 310 and restrains the plurality of power storage elements 100 and the plurality of spacers 310 in the arrangement direction (X-axis direction). Giving power.

  In the present embodiment, two restraining members 500 are arranged on both sides (Y-axis direction both sides) of the plurality of power storage elements 100, and the plurality of power storage elements 100 are separated from the both sides by the two restraining members 500. Hold and restrain. The restraining member 500 is preferably formed of a metal member such as stainless steel or aluminum, for example, similarly to the clamping member 400, 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, the bus bar frame 600 positions the bus bar 200 with respect to the plurality of power storage elements 100 in the power storage unit 20.

  Specifically, bus bar frame 600 is placed above the plurality of power storage elements 100 (Z-axis direction plus side) and positioned with respect to the plurality of power storage elements 100. In addition, 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 elements 100 and joined to the respective electrode terminals of the plurality of power storage elements 100. The bus bar frame 600 is formed of an insulating resin material such as PC, PP, PE, PPS, PBT, or ABS resin. However, the bus bar frame 600 is formed of any material as long as it is an insulating member. It doesn't matter.

  The heat shield plate 700 is a plate-like member having heat insulation disposed inside the exhaust passage of the safety valve of the power storage element 100. Specifically, heat shield plate 700 is disposed above bus bar frame 600 so as to be positioned above the safety valve of power storage element 100. In other words, the heat shield plate 700 protects electrical equipment such as a circuit board disposed above the power storage unit 20 from the heat of the gas when gas is discharged from the safety valve of the power storage element 100 in an abnormal state or the like. In this embodiment, the heat shield plate 700 is formed of a metal material such as stainless steel having low thermal conductivity. However, the present invention is not limited to this, and any material that has high heat resistance and low thermal conductivity may be used. For example, it may be formed of a resin such as PPS or PBT reinforced with glass fiber, or ceramic.

  In the power storage device 1 configured as described above, the configuration of the first exterior body 11 will be described in detail.

  FIG. 4 is an exploded perspective view showing a schematic configuration of the first exterior body 11 according to the embodiment of the present invention. 1 and 2 schematically show the first exterior body 11, but FIG. 4 shows it in more detail.

  As shown in FIG. 4, the first exterior body 11 includes a lid body 80 that closes the opening of the second exterior body 12 and a cover body 90 that covers a part of the lid body 80 in a separable manner.

  The lid body 80 is integrally formed of the above-described insulating resin material, and includes a top plate portion 81 and an edge portion 82.

  The top plate portion 81 is a portion facing the opening of the second exterior body 12. The top plate portion 81 includes an exposed portion 83 that is not covered by the cover body 90 and a covering portion 84 that is covered by the cover body 90.

  The exposed portion 83 is formed in a substantially flat shape, and the positive external terminal 13 and the negative external terminal 14 are disposed. The covering portion 84 is formed with a wall portion 85 erected at the boundary with the exposed portion 83. Electrical devices such as a circuit board 99 and a relay (not shown) and wiring (not shown) for connecting them to the power storage element 100 in the power storage unit 20 are arranged in the region inside the wall portion 85. Yes. A plurality of openings 84 a for guiding the wiring to the second exterior body 12 side are formed at the bottom of the covering portion 84.

  Here, in the circuit board 99, for example, various information such as a charge state and a discharge state of the power storage element 100, a voltage value, a current value, and a temperature are acquired, monitored, controlled, and the relay is turned on / off. And a control circuit for communicating with other devices. In FIG. 4, only the connector 99a which is a part of the control circuit is shown.

  Since various electric devices arranged in the covering portion 84 are covered by the cover body 90, they are protected from impacts and the like, and are prevented from coming into contact with an external metal member or the like.

  In the covering portion 84, an area where the circuit board 99 is arranged is referred to as a board installation area 840. The substrate installation area 840 is provided at one end of the covering portion 84 on the plus side in the X-axis direction. The circuit board 99 is arranged in a horizontal state (a state parallel to the XY plane) in the board installation region 840 and is accommodated in the first exterior body 11 by being covered by the cover body 90. That is, the first exterior body 11 is a housing portion that houses the circuit board 99.

  The substrate installation area 840 employs a drainage structure, and a specific structure thereof will be described later.

  The edge portion 82 extends downward from the periphery of the top plate portion 81 over the entire circumference of the top plate portion 81, and overlaps the outer periphery of the opening of the second exterior body 12 from the outside. A well-known watertight structure is used in a portion where the edge portion 82 and the second exterior body 12 overlap each other so that external water does not enter the second exterior body 12.

  FIG. 5 is a perspective view showing a schematic configuration of the cover body 90 according to the embodiment of the present invention from below.

  As shown in FIGS. 4 and 5, the cover body 90 is integrally formed of the insulating resin material described above, and has a shape corresponding to the outer shape of the covering portion 84 in a top view. 91 and an edge 92.

  The top plate portion 91 is a portion facing the covering portion 84 of the lid main body 80. On the top surface of the top plate portion 91, a concave portion 93 is formed in the center along the Y-axis direction, and portions other than the concave portion 93 are formed in a substantially flat shape.

  On the lower surface of the top plate portion 91 other than the concave portion 93, as shown in FIG. 5, a lattice portion 95 protruding downward in a lattice shape is formed. Further, in the opposing area 950 facing the substrate installation area 840 on the lower surface of the top plate portion 91 and the external area 960 adjacent to the opposing area 950, a dew condensation countermeasure structure is adopted for the lattice portion 95 of the part. A specific structure will be described later. Note that the upper wall surface 911 is a lower surface of the top plate portion 91 and includes a portion that covers the upper portion of the circuit board 99 installed in the board installation region 840.

  The edge portion 92 extends downward from the periphery of the top plate portion 91 over the entire circumference of the top plate portion 91, and overlaps the wall portion 85 of the lid main body 80 from the outside. A well-known watertight structure is used in a portion where the edge portion 92 and the wall portion 85 of the lid main body 80 overlap each other, so that external water does not enter the covering portion 84.

  Next, a drainage structure provided in the substrate installation region 840 of the lid body 80 will be described.

  FIG. 6 is a top view showing a schematic configuration of the substrate installation region 840 according to the embodiment of the present invention. FIG. 7 is a cross-sectional view of the first exterior body 11 when cut along the YZ plane including the line VII-VII in FIG. 6. FIG. 8 is a cross-sectional view of the first exterior body 11 when cut along the ZX plane including the line VIII-VIII in FIG. 6. In FIG. 6, the outer shape of the circuit board 99 is indicated by a two-dot chain line.

  As shown in FIGS. 6 to 8, the board installation area 840 is an area covered with the circuit board 99 and is a wall surface below the circuit board 99. The board installation region 840 has a rectangular shape that is substantially the same as the circuit board 99 in top view. Substrate holding portions 841 for holding the circuit board 99 are formed at the four corners of the substrate installation area 840. The substrate holding portion 841 is a cylindrical projection, and the inside is a screw hole.

  Of the four substrate holding portions 841, two positioning portions 842 for positioning the circuit board 99 are provided in the vicinity of the two substrate holding portions 841 disposed on the Y axis direction plus side. The positioning portion 842 includes a columnar main body 843 protruding from the substrate installation region 840 and a columnar positioning protrusion 844 protruding from the upper surface of the main body 843. The upper surface of the main body 843 of the positioning portion 842 and the upper surface of the substrate holding portion 841 are flush with each other, and the circuit board 99 placed on these upper surfaces can be held flat. Further, since the upper surface of the main body 843 of the positioning portion 842 and the upper surface of the substrate holding portion 841 are located above the wall surface which is the substrate installation region 840, the circuit board 99 and the substrate installation region 840 are spaced apart from each other. It is arranged with a gap. As shown in FIG. 4, the circuit board 99 has through holes 991 communicating with the screw holes of the board holding portion 841 at the four corners of the circuit board 99. The circuit board 99 is fixed in the board installation area 840 by screwing screws into the screw holes of the board holding portion 841 through the through holes 991. The circuit board 99 has a through hole 992 into which the positioning projection 844 is inserted. When the circuit board 99 is installed in the board installation region 840, the circuit board 99 can be positioned in the XY plane by inserting the positioning protrusion 844 into the through hole 992.

  Further, as shown in FIG. 6, a screw recess 845 in which a fixing screw (not shown) for fixing the heat shield plate 700 is disposed is formed in the substrate installation region 840. A through hole 846 is formed on the bottom surface of the screw recess 845, and a fixing screw is screwed into a screw hole provided in the heat shield plate 700 through the through hole 846.

  As shown in FIGS. 6 to 8, a drainage path 850 for draining outside the area is formed in the substrate installation area 840. That is, the drainage path 850 is formed vertically below the circuit board 99. The drainage path 850 includes a groove portion 851 and a guide portion 852 that guides water to the groove portion 851.

  The groove portion 851 is a drainage groove for draining water, and extends along the Y-axis direction at the center portion in the X-axis direction of the substrate installation region 840. Drain ports 853 are formed at both ends and the center in the extending direction of the groove 851. The drain port 853 is a through-hole penetrating in the vertical direction (Z-axis direction), and discharges water that has reached the drain port 853 to the outside of the substrate installation region 840.

  As shown in FIG. 6, the bus bar 41 (shown by a broken line in FIG. 6) below the first exterior body 11 is arranged at a position spaced horizontally from the vertically lower side of the drain port 853. Thereby, it is suppressed that the water discharged from the drain port 853 falls to the bus bar 41. In addition, it is desirable that the conductive members other than the bus bar 41 are also arranged at positions separated in the horizontal direction from the vertically lower side of the drain port 853. That is, water from the drain port 853 does not have to drop with respect to the conductive member. Therefore, the conductive member may not be disposed directly below the drain port 853. In other words, when a conductive member is disposed vertically below the drain port 853, a member that blocks water may be disposed between the drain port 853 and the conductive member. As shown in FIG. 7, the bottom surface 856 of the groove 851 is a first inclined surface that becomes lower toward the drain port 853. The bottom surface 856 between the drain port 853 at one end of the groove 851 and the central drain port 853 and the bottom surface 856 between the drain port 853 at the other end of the groove 851 and the central drain port 853 have the same shape. For this reason, only the shape of one bottom surface 856 will be described.

  One bottom surface 856 is inclined in a mountain shape with the central portion in the extending direction as a boundary. For this reason, the water in the groove 851 can be guided both to the drain port 853 on the one end side and to the central drain port 853.

  The bottom surface 856 of the groove 851 may be an inclined surface continuously inclined at the same angle as a whole. Further, the bottom surface of the groove 851 may be a curved surface. In addition, if the drainage property is not so important, the bottom surface 856 of the groove 851 may be a horizontal plane.

  As shown in FIGS. 6 to 8, a pair of guide portions 852 are provided so as to face each other across the groove portion 851 in the X-axis direction. Since the pair of guide portions 852 have substantially the same shape, only one guide portion 852 will be described as an example here, and only the portions different from the one guide portion 852 will be described later. .

  One guide portion 852 includes an inclined surface 857 (second inclined surface) that becomes lower toward the groove portion 851, that is, toward the bottom surface 856 (first inclined surface). The inclined surface 857 is a flat surface inclined with respect to the X-axis direction, but may be a curved surface. A plurality of drainage ribs 858 are arranged on the inclined surface 857 at intervals in the Y-axis direction. The drainage rib 858 is a long protrusion that extends from one end to the other end of the inclined surface 857 in the X-axis direction and extends along the inclined direction of the inclined surface 857. The upper surface of the drainage rib 858 is parallel to the XY plane. That is, the amount of protrusion of the drainage rib 858 from the inclined surface 857 increases toward the groove 851.

  The other guide portion 852 is provided with a screw recess 845. The peripheral edge of the screw recess 845 is raised above the inclined surface 857, so that the water flowing through the inclined surface 857 is difficult to flow into the screw recess 845.

  The wall surface forming the substrate installation region 840 is a hydrophobic surface. When the lid body 80 is formed of the insulating resin material described above, the wall surface becomes a hydrophobic surface by applying a known hydrophobic process to the wall surface forming the substrate installation region 840. The surface of each part provided on the substrate installation region 840 may be a hydrophobic surface. Further, the entire surface of the covering portion 84 of the lid body 80 may be a hydrophobic surface.

  Next, the effect | action of the drainage structure provided in the board | substrate installation area | region 840 of the lid | cover main body 80 is demonstrated.

  When the power storage device 1 is used, dew condensation may occur inside the exterior body 10 due to a temperature difference between the inside and the outside of the exterior body 10. For example, it is assumed that condensation occurs in the substrate installation region 840 of the lid body 80. Condensation generated on the inclined surface 857 is gradually guided to the groove 851 by the inclination of the inclined surface 857. At this time, since the wall surface forming the substrate installation region 840 is a hydrophobic surface, dew condensation is smoothly guided to the groove 851.

  Further, in the dew condensation that occurs near the drainage rib 858, there are cases where the dew condensation rib 858 touches the drainage rib 858 to gather with other dew condensation to form droplets. When it becomes a droplet, its own weight increases. Further, the drainage rib 858 itself can be a path for guiding the droplet to the groove 851. Due to these factors, condensation can be guided to the groove 851 more smoothly.

  Condensation (water) guided to the groove 851 is guided to each drain port 853 by the inclination of the bottom surface 856 of the groove 851, and is discharged out of the lid body 80 from the drain port 853.

  Next, a dew condensation countermeasure structure provided in the lattice portion 95 of the cover body 90 will be described.

  As shown in FIGS. 5, 7, and 8, the lattice portion 95 includes a plate-like first wall body 951 extending in the Y-axis direction and a plate-like second wall extending in the X-axis direction. A plurality of bodies 952 are provided. Since the plurality of first wall bodies 951 and the plurality of second wall bodies 952 intersect each other, a lattice shape is obtained when viewed from the Z-axis direction. And the dew condensation countermeasure structure is employ | adopted with respect to the part arrange | positioned in the opposing area | region 950 and the external area | region 960 of the top-plate part 91 among the grating | lattice parts 95. FIG.

  Here, the facing region 950 is a region facing the substrate installation region 840 in a plan view, that is, a region facing the circuit board 99. The external region 960 is an annular region that surrounds the opposing region 950 in plan view and is adjacent to the opposing region 950. A region obtained by combining the external region 960 and the opposing region 950 is referred to as a dew condensation countermeasure region 970.

  Note that, in the lattice portion 95 other than the dew condensation countermeasure region 970, the first wall body 951 and the second wall body 952 are generally formed at the same height as a whole, but the height is partially increased. In some places, is not constant. The installation position and height of the item are determined according to the height of an item (for example, an electric device) accommodated in the first exterior body 11.

  As shown in FIG. 7, the plurality of first wall bodies 951 in the dew condensation countermeasure region 970 are protrusions that protrude from the upper wall surface 911 toward the circuit board 99 side (Z-axis direction minus side). Along the Y-axis direction and continuously formed in a long shape. The plurality of first wall bodies 951 in the dew condensation countermeasure region 970 are arranged at a predetermined interval in the X-axis direction. The plurality of first wall bodies 951 in the dew condensation countermeasure area 970 are such that the central portion in the Y-axis direction is the highest and away from the circuit board 99, and lower toward the edge of the dew condensation countermeasure area 970 and approaches the circuit board 99. It is the formed 1st inclination part. In other words, the first wall body 951 that is the first inclined portion has a protrusion amount from the upper wall surface 911 that is the smallest in the central portion in the Y-axis direction and increases toward the edge of the dew condensation countermeasure region 970. Specifically, the lower end surface of the first wall body 951 that is the first inclined portion is formed in a flat surface that is inclined so as to become lower from the center of the facing region 950 toward the edge. As described above, the first wall body 951 that is the first inclined portion is continuously formed from the facing region 950 to the outer region 960, and is lower on the outer region 960 side than on the facing region 950 side.

  In addition, in this Embodiment, although the case where the lower end surface of the 1st wall body 951 which is a 1st inclination part is a plane is illustrated, a curved surface may be sufficient.

  As shown in FIGS. 7 and 8, the plurality of second wall bodies 952 in the dew condensation countermeasure region 970 are protruding portions that protrude from the upper wall surface 911 toward the circuit board 99 side (Z-axis direction minus side). , And extends in the X-axis direction along the upper wall surface 911. The plurality of second wall bodies 952 in the dew condensation countermeasure region 970 are arranged between the plurality of first wall bodies 951 and arranged at a predetermined interval in the Y-axis direction. The plurality of second wall bodies 952 in the dew condensation countermeasure region 970 are second inclined portions that become lower toward the first inclined portion. Specifically, the lower end surface of the second wall body 952 that is the second inclined portion has the highest center in the X-axis direction between the adjacent first wall bodies 951, and is separated from the circuit board 99. The curved surface is formed so as to be lowered toward the wall body 951 so as to approach the circuit board 99. The lower end surface of the second wall body 952 that is the second inclined portion is a concave curved surface that is recessed upward. In other words, the second wall body 952 that is the second inclined portion has a protrusion amount from the upper wall surface 911 that is the smallest at the central portion between the adjacent first wall bodies 951 and increases toward the first wall body 951. ing.

  In addition, although the case where the lower end surface of the 2nd wall body 952 was a concave curved surface was illustrated, the inclined plane may be sufficient. For example, in the present embodiment, the lower end surface of the second wall body 952a located on the most positive side in the X-axis direction is one of the first walls disposed on the negative side in the X-axis direction among the adjacent first wall bodies 951. The flat inclined surface gradually decreases from the wall body 951 toward the other first wall body 951.

  In addition, the plurality of second wall bodies 952 are formed to have a height (projection amount) corresponding to the height (projection amount) of the corresponding first wall body 951. That is, the lower end surface of the second wall body 952 provided in the higher portion of the first wall body 951 is higher, and the lower end surface of the second wall body 952 provided in the lower portion of the first wall body 951 is lower. It becomes. Specifically, based on FIG. 7, the second wall body 952 a corresponding to the highest portion of the first wall body 951 has a lower end surface higher than the lower end surfaces of the other second wall bodies 952. On the other hand, the lower end surface of the second wall body 952 b corresponding to the lowest portion of the first wall body 951 is lower than the lower end surfaces of the other second wall bodies 952.

  And the upper wall surface 911 which makes the dew condensation countermeasure area | region 970 is a hydrophilic surface. When the cover body 90 is formed of the insulating resin material described above, the upper wall surface 911 becomes a hydrophilic surface by applying a known hydrophilic process to the upper wall surface 911 forming the dew condensation prevention region 970. The surface of each part provided on the upper wall surface 911 forming the dew condensation countermeasure region 970 may be a hydrophilic surface. The entire lower surface including the lattice portion 95 of the cover body 90 may be a hydrophilic surface.

  Next, the operation of the dew condensation countermeasure structure provided in the dew condensation countermeasure region 970 of the cover body 90 will be described.

  When the power storage device 1 is used, dew condensation may occur inside the exterior body 10 due to a temperature difference between the inside and the outside of the exterior body 10. For example, it is assumed that condensation occurs in the condensation countermeasure area 970 of the cover body 90. Condensation generated on the upper wall surface 911 is transmitted to the second wall body 952 and the first wall body 951. In addition, the dew condensation that has occurred in the second wall body 952 that is the second inclined portion or the dew condensation that has been transmitted from the upper wall surface 911 to the second wall body 952 is caused by the inclination of the lower end surface of the second wall body 952. Guided to 951. Condensation that has occurred on the first wall body 951 or that has been transmitted from the second wall body 952 or the upper wall surface 911 to the first wall body 951 is caused by the inclination of the lower end surface of the first wall body 951 that is the first inclined portion. Then, it is gradually guided to the external area 960 and falls. At this time, since the external region 960 protrudes horizontally from the circuit board 99 over the entire circumference, it is suppressed that the dew condensation that has dropped falls on the circuit board 99. The fallen dew condensation is discharged from the drain outlet 853 to the outside of the lid body 80 by the drainage structure of the lid body 80.

  As described above, according to the power storage device 1 according to the embodiment of the present invention, the first wall body 951 that is the first inclined portion is formed in the region covering the circuit board 99 on the upper wall surface 911 of the exterior body 11. Therefore, the dew condensation can be guided to a desired position using the first wall body 951 as a guide. Therefore, it is possible to suppress dew condensation from falling on the circuit board 99 and to suppress a short circuit of the circuit board 99.

  In addition, since the first wall body 951 that is the first inclined portion is continuously provided up to the outer region 960, the dew condensation can be guided to the outside of the circuit board 99, and the dew condensation falls on the circuit board 99. It can be suppressed more.

  In addition, since the first wall body 951 that is the first inclined portion is a long protruding portion, it is difficult for the dew condensation to fall even when compared with the case where the upper wall surface is simply inclined, and the dew condensation drops into the droplets. Easy to gather as.

  Moreover, since the 1st wall body 951 which is a 1st inclination part is provided with two or more intervals, dew condensation can be guided over a wide range.

  Moreover, since the 2nd inclination part (2nd wall body 952) which becomes low as it goes to the 1st wall body 951 which is a 1st inclination part is provided, the 1st wall body 951 dew condensation by the said 2nd wall body 952. Therefore, condensation can be easily induced to the first wall body 951.

  Moreover, since the upper wall surface 911 is a hydrophilic surface, it can suppress that the dew condensation which generate | occur | produced on the said upper wall surface 911 falls.

  Further, since a drainage path 850 for draining dew condensation out of the board installation area 840 is formed in the board installation area 840 on the wall surface below the circuit board 99, it is possible to suppress the accumulation of condensation in the board installation area 840. it can. Therefore, a short circuit of the circuit board 99 due to condensation can be suppressed.

  Further, since the bottom surface 856 of the drainage path 850 is a first inclined surface that becomes lower toward the drainage port 853, the drainage can be reliably guided to the drainage port 853.

  In addition, since the bus bar 41 is disposed at a position spaced horizontally from the vertically lower side of the drain port 853, the drainage is prevented from falling onto the bus bar 41. Therefore, a short circuit of power storage device 1 itself due to drainage can be prevented.

  In addition, since an inclined surface 857 (second inclined surface) that becomes lower toward the bottom surface 856 of the drainage path 850 is formed in the substrate installation region 840 facing the circuit board 99, dew condensation generated in the substrate installation region 840 is prevented. The inclined surface 857 can guide the groove 851.

  Further, since the drainage ribs 858 that are long along the tilt direction are provided on the tilted surface 857, it is easy to collect condensation as droplets, and the drainage ribs 858 allow the droplets to reach the groove 851 of the drainage path 850. I can guide you.

  In this embodiment, the case where the inclined surface 857 is provided with the drainage rib 858 protruding from the inclined surface 857 has been described as an example, but instead of the drainage rib 858, the inclined surface 857 A long groove portion may be formed along the inclination direction. Even in this case, the same effect as the drainage rib 858 can be obtained.

  In addition, since the circuit board 99 is arranged with a space from the wall surface forming the board installation area 840, it is possible to prevent the circuit board 99 from coming into contact with the condensation generated in the board installation area 840. it can.

  Further, since the wall surface forming the substrate installation region 840 is a hydrophobic surface, it is possible to easily cause the dew condensation generated on the wall surface to flow.

(Modification 1)
Next, Modification 1 of the above embodiment will be described. In the said embodiment, the case where the 1st wall body 951 in the dew condensation countermeasure area | region 970 among the grating | lattice parts 95 was a 1st inclination part was illustrated. However, the shape of the first inclined portion may be any shape as long as the shape becomes lower toward the edge of the condensation countermeasure region 970.

  Hereinafter, the case where the first inclined portion is a plane will be described with reference to FIGS. 9 and 10. In the following description, the same parts as those in the above embodiment may be given the same reference numerals and the description thereof may be omitted.

  FIG. 9 is a cross-sectional view of the first exterior body 11A according to Modification 1, and corresponds to FIG. FIG. 10 is a cross-sectional view of the first exterior body 11A according to Modification 1, and corresponds to FIG.

  As shown in FIGS. 9 and 10, the cover body 90 </ b> A of the first exterior body 11 </ b> A is an inclined surface in which the upper wall surface 911 a that forms the condensation countermeasure region 970 </ b> A is inclined as a whole. That is, the upper wall surface 911a is a first inclined portion that becomes lower toward the edge of the condensation countermeasure region 970A. Specifically, the upper wall surface 911a has an inclination that gradually decreases toward the Y-axis direction minus side when viewed from the direction shown in FIG. 7, and when viewed from the direction shown in FIG. It has a slope that gradually decreases toward.

  Thus, since the upper wall surface 911a which is an inclined surface is the first inclined portion, the dew condensation can be guided to a desired position with a simple configuration.

  In addition, the 1st inclination part should just be an inclined surface formed by inclining at least one part of an upper wall surface rather than the inclined surface which consists of the whole upper wall surface 911a. The first inclined portion may be curved.

  The power storage device according to the embodiment of the present invention and the modification thereof has been described above, but the present invention is not limited to the above-described embodiment and the modification. In other words, it should be considered that the embodiment and its modification disclosed this time are illustrative and not restrictive in all respects. 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. In addition, embodiments constructed by arbitrarily combining the constituent elements included in the above-described embodiment and its modifications are also included in the scope of the present invention.

  For example, in the above-described embodiment and its modifications, the case where the drainage structure is adopted for the substrate installation region 840 of the lid body 80 is illustrated. However, a drainage structure may be adopted for an area other than the substrate installation area 840 of the lid body 80 or the entire lid body 80. In particular, it is preferable from the viewpoint of short circuit suppression to employ a drainage structure in an area where electrical equipment other than the circuit board 99 is installed.

  Further, in the above-described embodiment and its modifications, the case where the dew condensation countermeasure structure is adopted for the dew condensation countermeasure region 970 of the cover body 90 is illustrated. However, a dew condensation countermeasure structure may be adopted for a region other than the dew condensation countermeasure region 970 of the cover body 90 or the entire lattice portion 95 of the cover body 90. In particular, it is preferable from the viewpoint of short-circuit suppression to employ a dew condensation countermeasure structure for a region covering an electrical device other than the circuit board 99.

  Moreover, in the said embodiment and its modification, although the case where the drainage structure and the dew condensation countermeasure structure were applied with respect to the circuit board 99 which is one of the electric devices was illustrated, for example, the relay incorporated in the exterior body 10 For example, at least one of a drainage structure and a dew condensation prevention structure may be applied to other electrical devices.

  Moreover, in the said embodiment, the 1st exterior body 11 was illustrated as an accommodating part which accommodates the circuit board 99. FIG. However, as long as the circuit board 99 is accommodated in the exterior body 10, the shape of the accommodation portion is not limited to the first exterior body 11. For example, when a dedicated case for housing the circuit board 99 is provided in the exterior body 11, this case may be used as the housing portion.

  The present invention can be applied to a power storage device including a power storage element and an exterior body.

1 power storage device 10 exterior body 11, 11A first exterior body (accommodating portion)
12 Second exterior body 13 Positive electrode external terminal 14 Negative electrode external terminal 20 Power storage unit 30 Holding member 41, 42, 200 Bus bar 50 Thermistor 80 Lid body 81, 91 Top plate portion 82, 92 Edge portion 83 Exposed portion 84 Cover portion 84a Opening 85 Wall part 90, 90A Cover body 93 Concave part 95 Grid part 99 Circuit board 99a Connector 100 Power storage element 110 Container 120 Positive electrode terminal 130 Negative electrode terminal 300, 310, 320 Spacer 400 Holding member 500 Restraining member 600 Bus bar frame 700 Heat shield plate 840 Substrate installation Region 841 Substrate holding portion 842 Positioning portion 843 Main body 844 Protrusion 845 Screw recess 846, 991, 992 Through hole 850 Drain passage 851 Groove 852 Guide portion 853 Drain outlet 856 Bottom 857 Inclined surface 858 Drain rib 911, 911a Upper wall surface 950 Pair Region 951 first wall member (first inclined portion, the protruding portion)
952, 952a, 952b Second wall (second inclined portion)
960 External area 970, 970A Condensation countermeasure area

Claims (7)

A power storage device comprising a power storage element and an exterior body,
An electrical device provided in the exterior body;
A housing portion for housing the electrical device,
A power storage device in which an upper wall surface above the electric device in the housing portion is disposed in a region covering the electric device, and a first inclined portion that approaches the electric device toward an edge of the region. The said 1st inclination part is continuously provided from the said area | region to the external area | region adjacent to the said area | region, and the said external region side is lower than the said area | region side in a said 1st inclination part. Power storage device. The first inclined portion is a protruding portion protruding from the upper wall surface toward the electric device side,
The power storage device according to claim 1, wherein the protruding portion is formed in an elongated shape along the upper wall surface. The power storage device according to claim 3, wherein a plurality of the first inclined portions are formed at intervals. The power storage device according to claim 1, wherein the upper wall surface is provided with a second inclined portion that is closer to the electric device toward the first inclined portion. The power storage device according to claim 1 or 2, wherein the first inclined portion is an inclined surface formed by inclining at least a part of the upper wall surface. The power storage device according to any one of claims 1 to 6, wherein the upper wall surface is a hydrophilic surface.

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