Power storage device

Abstract

To provide a power storage device capable of suppressing short circuits.SOLUTION: A power storage device includes: power storage elements; a substrate 82 electrically connected to the power storage elements; and a storage portion for accommodating the substrate. Therein: within the storage portion, conductive portion in a pair are arranged at a predetermined interval and exposed in a first direction Z; at least one of the conductive portions in the pair is arranged on the substrate; and the storage portion is arranged within the interval and includes a protrusion 172 protruding in a first direction, the protrusion protrudes further than the tip end in the first direction of at least one of the conductive portions in the pair.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an electricity storage device. [Background technology]

[0002] Conventionally, a secondary battery pack has been known in which a plurality of laminated cells are housed in a housing and these laminated cells are connected to a first bus bar and a second bus bar with stud bolts (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-111512 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the manufacture of a conventional electricity storage device, there is a risk that a stud bolt may fall off of a worker's hand and interfere with an electric current-carrying portion, causing a short circuit in the electric current-carrying portion.

[0005] An object of the present invention is to provide an electricity storage device capable of suppressing a short circuit. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, an energy storage device according to one embodiment of the present invention comprises an energy storage element, a substrate electrically connected to the energy storage element, and a storage section for accommodating the substrate, wherein a pair of conductive parts are arranged at a predetermined interval and exposed in a first direction are provided within the storage section, at least one of the pair of conductive parts is arranged on the substrate, and the storage section has a protrusion arranged within the interval and protruding in the first direction, and the protrusion protrudes further than the tip end in the predetermined direction of at least one of the pair of conductive parts. Effect of the Invention

[0007] According to the present invention, it is possible to provide an electricity storage device capable of suppressing a short circuit. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment. [Diagram 2] FIG. 2 is an exploded perspective view showing each component of the electricity storage device according to the embodiment. [Diagram 3] FIG. 3 is an exploded perspective view showing an internal structure of a storage unit according to the embodiment. [Figure 4] FIG. 4 is a perspective view showing a pair of first current conducting parts according to the embodiment. [Diagram 5] FIG. 5 is a top view showing a pair of first current conducting parts according to the embodiment. [Figure 6] FIG. 6 is a cross-sectional view showing a protruding portion according to the embodiment. [Figure 7] FIG. 7 is a perspective view showing a cover member having a protrusion according to the embodiment. [Figure 8] FIG. 8 is a cross-sectional perspective view showing a protruding portion according to the first modification. [Figure 9] FIG. 9 is a top view showing a protrusion according to the first modification. [Figure 10] FIG. 10 is a perspective view showing a protrusion according to the second modification. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (1) An energy storage device according to one embodiment of the invention comprises an energy storage element, a substrate electrically connected to the energy storage element, and a housing for housing the substrate, wherein the housing comprises a pair of conductive parts arranged at a predetermined interval and exposed in a first direction, at least one of the pair of conductive parts is arranged on the substrate, and the housing comprises a protrusion arranged within the interval and protruding in the first direction, the protrusion protruding further than a tip end in the first direction of at least one of the pair of conductive parts.

[0010] According to the electricity storage device described in (1) above, a protruding portion that protrudes in the first direction beyond the tip of at least one of the current-carrying portions is provided between the pair of current-carrying portions (at a predetermined interval), so that even if a conductive member (e.g., a bolt, a nut, etc.) is about to enter between the pair of current-carrying portions, the protruding portion can block the entry. This makes it possible to suppress a short circuit between the pair of current-carrying portions caused by the conductive member.

[0011] (2) In the energy storage device described above in (1), the housing may include a substrate support portion that supports the substrate, and the protrusion may be provided on the substrate support portion.

[0012] According to the electricity storage device described in (2) above, the conductive member moves on the substrate support part, but since the substrate support part is provided with a protrusion, the protrusion and the substrate support part are continuous with each other. In other words, a gap is unlikely to occur between the protrusion and the substrate support part, and the protrusion can more reliably block the intrusion of the conductive member.

[0013] (3) In the energy storage device described above in (1), the storage section may include a cover member that covers at least one of the pair of conductive parts, and the protrusion may be provided on the cover member.

[0014] According to the electricity storage device described in (3) above, since the protrusion is provided on the cover member, the protrusion is not disposed between the pair of current-carrying parts before the cover member is attached, which prevents the protrusion from getting in the way when working around the current-carrying parts.

[0015] (4) In the power storage device according to any one of (1) to (3) above, the protrusion may penetrate the substrate.

[0016] According to the electricity storage device described in (4) above, since the protrusion penetrates the substrate, the protrusion can limit misalignment of the substrate.

[0017] (5) In the power storage device according to any one of (1) to (4) above, the protruding portion may surround more than half of at least one of the pair of current conducting portions when viewed from the first direction.

[0018] According to the electricity storage device described in (5) above, since the protruding portion surrounds at least half of one of the current-carrying parts, it is possible to more reliably prevent the conductive member from coming into contact with the current-carrying part, thereby more reliably preventing a short circuit between the pair of current-carrying parts caused by the conductive member.

[0019] (6) In the energy storage device according to any one of (1) to (5) above, at least one of the pair of current-carrying parts may include a bolt extending in the first direction and a nut tightened to the bolt.

[0020] According to the energy storage device described in (6) above, when at least one conductive part includes a bolt extending in a first direction and a nut tightened to the bolt, even if the nut falls off the bolt, the protruding part acts as a barrier to prevent interference with other conductive parts.

[0021] (7) In the energy storage device described in any one of (1) to (6) above, when viewed from a second direction intersecting the first direction, the pair of conductive parts may be arranged within the protrusion.

[0022] According to the electricity storage device described in (7) above, since the pair of current-carrying parts are disposed inside the protruding parts when viewed from the second direction, the current-carrying parts can be entirely shielded by the protruding parts, and therefore, the insulation of the current-carrying parts by the protruding parts can be more reliably ensured.

[0023] (Embodiment) Hereinafter, a description will be given of an energy storage device according to an embodiment (including modified examples) of the present invention with reference to the drawings. Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples and are not intended to limit the present invention. In each drawing, dimensions and the like are not strictly illustrated. In each drawing, the same reference numerals are used for identical or similar components. The names of the components (each component) in this embodiment are those in this embodiment and may differ from the names of the components (each component) in the background art.

[0024] In the following description and drawings, the X-axis direction is defined as the direction in which the terminals of one storage element are arranged, or the direction in which the short side surfaces of the container of one storage element face each other. The Y-axis direction is defined as the direction in which the multiple storage elements are arranged, the direction in which the long side surfaces of the container of one storage element face each other, or the thickness direction of the container. The Z-axis direction is defined as the direction in which the exterior body and the outer lid of the exterior body of the storage device are arranged, or the up-down direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect with each other (orthogonal in the following embodiments). Here, although it is considered that the Z-axis direction is not the up-down direction depending on the usage mode, for convenience of explanation, the following description will be given assuming that the Z-axis direction is the up-down direction. In the following description, for example, the positive X-axis direction indicates the direction of the arrow of the X-axis, and the negative X-axis direction indicates the opposite side to the positive X-axis direction. The same applies to the Y-axis direction and the Z-axis direction. Furthermore, expressions indicating relative directions or attitudes, such as parallel and orthogonal, also include cases where they are not strictly the directions or attitudes. For example, two directions being perpendicular to each other does not only mean that the two directions are completely perpendicular to each other, but also means that the two directions are substantially perpendicular to each other, that is, that the difference is, for example, about a few percent. In the following explanation, the term "insulation" means "electrical insulation." An insulating material has a volume resistivity of 1×10 10 It is preferable that the material used is one having a resistance of Ωm or higher.

[0025] [General Description of Power Storage Device 1] First, an overall description of a power storage device 1 according to an embodiment will be given with reference to Fig. 1 and Fig. 2. Fig. 1 is a perspective view showing the external appearance of the power storage device 1 according to an embodiment. Fig. 2 is an exploded perspective view showing each component when the power storage device 1 according to the embodiment is disassembled.

[0026] The power storage device 1 is a device that can be charged with electricity from the outside and can discharge electricity to the outside, and in this embodiment, has a substantially rectangular parallelepiped shape. The rectangular parallelepiped here means a hexahedron with all faces formed of rectangles or squares. For example, the power storage device 1 is a battery module (battery pack) used for power storage or power supply. Specifically, the power storage device 1 is used as a battery for driving or starting an engine of a moving body such as an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, an automatic guided vehicle (AGV: Automatic Guided Vehicle), or a railway vehicle for an electric railway. Examples of the above-mentioned automobiles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), fossil fuel (gasoline, diesel, liquefied natural gas, etc.) automobiles, and hydrogen engine automobiles. Examples of the above-mentioned railway vehicles for an electric railway include electric trains, monorails, linear motor cars, and hybrid electric trains equipped with both a diesel engine and an electric motor. The power storage device 1 can also be used as a stationary battery for home or business use.

[0027] 1 and 2, the energy storage device 1 includes an energy storage element 200 and an exterior body 10 that houses the multiple energy storage elements 200. The exterior body 10 includes an exterior body main body 11 that houses the multiple energy storage elements 200, a bus bar frame 17 that is disposed above the multiple energy storage elements 200, and an outer lid 12 that covers the upper part of the bus bar frame 17.

[0028] The exterior body 10 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the energy storage device 1. In other words, the exterior body 10 is a member that fixes the multiple energy storage elements 200, the bus bar frame 17, etc. in predetermined positions and protects these elements from impacts and the like.

[0029] The exterior body 11 is a rectangular cylindrical member with a bottom and an open top, and the open portion is a main body opening 11a. The main body opening 11a is substantially rectangular in a plan view. In addition to the multiple energy storage elements 200 and the bus bar frame 17, the main body opening 11a of the exterior body 11 accommodates multiple bus bars (not shown) held by the bus bar frame 17. The exterior body 11 may accommodate at least one of an insulating inter-cell spacer arranged between the energy storage elements 200, a pair of end members sandwiching the multiple energy storage elements 200, and an insulating end spacer arranged between the energy storage elements 200 and the end member.

[0030] The outer lid 12 is a member that closes the body opening 11a of the exterior body 11. The outer lid 12 is joined to the exterior body 11 in a state in which the outer lid 12 covers the body opening 11a of the exterior body 11. The outer lid 12 has a first top surface portion 121, a second top surface portion 125, and a pair of terminal installation portions 123. The first top surface portion 121 has a first outer surface 122 that is arranged along the XY plane and is located at the end of the outer lid 12 in the Y-axis negative direction. The second top surface portion 125 has a second outer surface 126 that is arranged along the XY plane and is located in the Y-axis positive direction of the outer lid 12 from the first top surface portion 121. The second outer surface 126 is located in the Z-axis positive direction from the first outer surface 122. A connection unit 80 including a control circuit and the like is arranged inside the second top surface portion 125.

[0031] Of the pair of terminal installation parts 123, one terminal installation part 123 is disposed near a corner of the outer lid 12 in the negative Y-axis direction and the negative X-axis direction, and the other terminal installation part 123 is disposed near a corner of the outer lid 12 in the negative Y-axis direction and the positive X-axis direction. Each terminal installation part 123 has a terminal installation surface 124 along the XY plane disposed between the first outer surface 122 of the first top surface part 121 and the second outer surface 126 of the second top surface part 125 in the Z-axis direction. A negative external terminal 92 is disposed on the terminal installation surface 124 of one terminal installation part 123, and a positive external terminal 91 is disposed on the terminal installation surface 124 of the other terminal installation part 123. The external terminals 91 and 92 are electrically connected to a plurality of energy storage elements 200 via a plurality of bus bars and a connection unit 80. The electricity storage device 1 is charged with electricity from the outside and discharges electricity to the outside via the external terminals 91, 92.

[0032] The second top surface portion 125 is provided with an opening 18 for electrically connecting the external terminals 91, 92 and the connection unit 80 during assembly. The opening 18 is closed by attaching a cover member 19 to the second top surface portion 125. The cover member 19 is joined to the second top surface portion 125 by adhesion, welding, or the like.

[0033] The exterior body 11, the outer lid 12, and the lid member 19 of the exterior body 10 are formed of insulating materials such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyether ether ketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyether sulfone (PES), ABS resin, or composite materials thereof, or metals or the like with insulating coating. This prevents the energy storage element 200 and the like from coming into contact with external metal members and the like. Note that the exterior body 10 may be formed of a conductive material such as metal as long as the electrical insulation of the energy storage element 200 and the like is maintained.

[0034] The energy storage element 200 is a secondary battery (single cell) capable of charging and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The energy storage element 200 has a flat rectangular parallelepiped shape (square shape), and in this embodiment, four energy storage elements 200 are arranged in the Y-axis direction. The shape of the energy storage element 200 and the number of the energy storage elements 200 arranged are not limited. The energy storage element 200 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, a capacitor, or a primary battery that can use stored electricity without the user having to charge it. The energy storage element 200 may be a pouch-type energy storage element. The energy storage element 200 may be a solid electrolyte battery. The energy storage element 200 includes a rectangular parallelepiped (square or box-shaped) container 210 and a pair of terminals 240 (positive and negative electrodes). Although not shown in the figure, an upper gasket is disposed between the container 210 and the terminal 240. A lower gasket, an electrode body, a pair of current collectors (positive electrode and negative electrode), an electrolytic solution (non-aqueous electrolyte), and the like are contained inside the container 210, but these are not shown in the figure. There is no particular limit to the type of the electrolytic solution as long as it does not impair the performance of the energy storage element 200, and various types can be selected. In addition to the above-mentioned components, the energy storage element 200 may have a spacer disposed on the side or below the electrode body, an insulating film that wraps the electrode body, and the like.

[0035] The material of the container 210 is not particularly limited, and may be a weldable (joinable) metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel sheet, but resin may also be used. Furthermore, an insulating film (shrink tube, etc.) that covers the outer surface of the container 210 may be disposed around the container 210. The material of the insulating film is not particularly limited as long as it can ensure the insulation required for the energy storage element 200, and examples of the material include insulating resins such as PC, PP, PE, PPS, PET, PBT, or ABS resin, epoxy resin, Kapton (registered trademark), Teflon (registered trademark), silicone, polyisoprene, and polyvinyl chloride.

[0036] The terminals 240 are terminal members (positive and negative terminals) of the energy storage element 200, and are electrically connected to the positive and negative plates of the electrode body via current collectors. In other words, the terminals 240 are metal members for leading out electricity stored in the electrode body to the external space of the energy storage element 200, and for introducing electricity into the internal space of the energy storage element 200 in order to store electricity in the electrode body. The terminals 240 are made of aluminum, an aluminum alloy, copper, a copper alloy, or the like.

[0037] The electrode body is an electric storage element (power generating element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate is a positive electrode active material layer formed on a positive electrode base material layer which is a current collector foil made of a metal such as aluminum or an aluminum alloy. The negative electrode plate is a negative electrode active material layer formed on a negative electrode base material layer which is a current collector foil made of a metal such as copper or a copper alloy. As the active material used in the positive electrode active material layer and the negative electrode active material layer, any known material can be used as long as it can absorb and release lithium ions. The separator can be a microporous sheet or nonwoven fabric made of resin. In this embodiment, the electrode body is formed by laminating electrode plates (positive electrode plate and negative electrode plate) in the Y-axis direction. The electrode body may be any type of electrode body, such as a wound type electrode body formed by winding electrode plates (positive electrode plate and negative electrode plate), a stack type electrode body formed by stacking a plurality of flat electrode plates, or a bellows type electrode body in which the electrode plates are folded in a bellows shape.

[0038] The current collectors are conductive members (positive and negative current collectors) electrically connected to the terminal 240 and the electrode body. The positive current collector is made of aluminum or an aluminum alloy, etc., like the positive electrode base layer of the positive electrode plate, and the negative current collector is made of copper or a copper alloy, etc., like the negative electrode base layer of the negative electrode plate.

[0039] The upper gasket is disposed between the container 210 and the terminal 240, and provides insulation and sealing between the container 210 and the terminal 240. The lower gasket is disposed between the container 210 and the current collector, and provides insulation and sealing between the container 210 and the current collector. The upper gasket and the lower gasket may be made of any material as long as they have electrical insulation properties.

[0040] The bus bar is a rectangular plate-like member that is placed on at least two adjacent energy storage elements 200 while being held by the bus bar frame 17, and electrically connects the terminals 240 (positive electrode terminals and negative electrode terminals) of the at least two adjacent energy storage elements 200. The bus bar is formed of a conductive member made of metal, such as copper, a copper alloy, aluminum, an aluminum alloy, nickel, a clad material, or the like.

[0041] The connection unit 80 is a unit having a plurality of conductors 81, a substrate 82, and the like. That is, the connection unit 80 is an example of an electronic device housed in the exterior body 10. The connection unit 80 electrically connects the four energy storage elements 200 to the external terminals 91, 92. The substrate 82 is electrically connected to each of the energy storage elements 200 via the plurality of conductors 81 and a bus bar. Specifically, the substrate 82 has a plurality of electric components, and a detection circuit for detecting the state of each of the energy storage elements 200, a control circuit for controlling charging and discharging, and the like are formed by the plurality of electric components. In addition, a sensor (not shown) attached to the energy storage element 200 is electrically connected to the detection circuit. Here, the sensor is a sensor that detects the state of the energy storage element 200. Specifically, examples of the sensor include a temperature sensor (thermistor) that detects the temperature of the energy storage element 200, and a voltage sensor that detects the voltage of the energy storage element 200.

[0042] Bus bar frame 17 is a member arranged above the multiple energy storage elements 200 (on the side where terminals 240 are arranged). In the present embodiment, bus bar frame 17 is a member that holds multiple bus bars connected to energy storage elements 200, a sensor attached to energy storage elements 200, and connection unit 80. More specifically, bus bar frame 17 is a member that holds multiple bus bars, sensors, connection unit 80, and other wiring, etc., and can restrict the positions of these components. Bus bar frame 17 is also fixed to exterior body 11, and thereby has the role of restricting, for example, the movement of multiple energy storage elements 200 upward (in the positive direction of the Z axis).

[0043] The bus bar frame 17 may also be called, for example, a "bus bar plate" or an "inner cover." The bus bar frame 17 is formed from an insulating material such as PC, PP, PE, PS, PPS, PPE (including modified PPE), PET, PBT, PEEK, PFA, PTFE, PES, ABS resin, or a composite material thereof, or a metal with an insulating coating.

[0044] As described above, the outer lid 12 is disposed above the bus bar frame 17. Therefore, the connection unit 80 is accommodated in the space formed by the bus bar frame 17 and the second top surface portion 125 of the outer lid 12. In other words, the bus bar frame 17 and the outer lid 12 are an example of an accommodating portion 100 that accommodates the substrate 82 of the connection unit 80.

[0045] [Storage section 100] Next, the accommodating section 100 will be described. Fig. 3 is an exploded perspective view showing the internal structure of the accommodating section 100 according to the embodiment. As shown in Fig. 3, the board 82 of the connection unit 80 is disposed inside the second top surface portion 125 of the outer lid 12. The board 82 entirely covers the bus bar frame 17 in the X-axis direction, and covers the bus bar frame 17 from the center to the end in the Y-axis positive direction in the Y-axis direction. The portion of the bus bar frame 17 that faces the board 82 and supports the board 82 is the board support portion 171. The board 82 is fixed to the board support portion 171 by, for example, a bolt tightening structure, a caulking structure, a fitting structure, an adhesive structure, a welding structure, or the like.

[0046] A plurality of current-carrying portions 110 electrically connected to at least one of the plurality of conductors 81 are arranged on bus bar frame 17. The plurality of current-carrying portions 110 include a plurality of first current-carrying portions 113 arranged on substrate 82 and a plurality of second current-carrying portions 114 arranged at a position different from substrate 82.

[0047] Each first current conducting portion 113 is exposed in the positive direction of the Z axis on the substrate 82. Specifically, each first current conducting portion 113 protrudes in the positive direction of the Z axis from above the substrate 82. The portion of each first current conducting portion 113 protruding from the substrate 82 is not covered with an insulating layer, and the exposed surface is conductive.

[0048] Each second electric current portion 114 is exposed in the positive direction of the Z axis on the conductor 81 that is disposed at a position different from the substrate 82. Specifically, each second electric current portion 114 protrudes in the positive direction of the Z axis from on the conductor 81. The portion of each second electric current portion 114 protruding from the conductor 81 is not covered with an insulating layer, and the exposed surface is conductive.

[0049] In this way, since the exposed surfaces of the first current-carrying parts 113 and the second current-carrying parts 114 are conductive, they are prone to short-circuiting when other conductive members come into contact with the multiple current-carrying parts at the same time. Measures to prevent short-circuiting will be described below.

[0050] [A pair of adjacent conductive parts spaced apart by a given distance H1] The first current-carrying parts 113 include first current-carrying parts 113a and 113b as a pair of current-carrying parts adjacent to each other with a predetermined interval H1 therebetween. FIG. 4 is a perspective view showing the pair of first current-carrying parts 113a and 113b according to the embodiment. FIG. 5 is a top view showing the pair of first current-carrying parts 113a and 113b according to the embodiment. As shown in FIGS. 4 and 5, the first current-carrying parts 113a and 113b have a bolt 111a extending in the Z-axis direction and a washer 112a into which the bolt 111a is inserted. In contrast, the other first current-carrying parts 113 have a bolt 111b extending in the Z-axis direction and a nut 112b tightened to the bolt 111b.

[0051] The pair of first current-carrying parts 113a, 113b have opposite polarities. In this embodiment, the pair of first current-carrying parts 113a, 113b are disposed at the center of the substrate 82 in the X-axis direction and at the end in the Y-axis negative direction. The pair of first current-carrying parts 113a, 113b are disposed at a predetermined interval H1 in the X-axis direction. The predetermined interval H1 is a value smaller than the overall length (total length in the case of a bolt, diagonal distance in the case of a nut, and outer diameter in the case of a washer) of the largest conductive member among the conductive members (bolts, nuts, washers, etc.) installed on the bus bar frame 17. From the viewpoint of ease of rolling, the predetermined interval H1 may be a value smaller than the diagonal distance of the largest nut among the multiple nuts installed on the bus bar frame 17.

[0052] When the largest conductive member enters the predetermined interval H1, the conductive member may contact the first current-carrying parts 113a and 113b at the same time, causing a short circuit. In order to prevent this interference, the board support part 171 is provided with a protruding part 172 arranged within the predetermined interval H1. The protruding part 172 protrudes from the upper surface of the board support part 171 in the positive direction of the Z axis. The protruding part 172 penetrates the board 82 through a notch 811 formed in the board 82. The protruding part 172 is a rectangular wall in a plan view parallel to the YZ plane. When viewed from the X-axis direction (second direction), the first current-carrying parts 113a and 113b are housed within the protruding part 172. That is, the length Ly1 of the protruding part 172 in the Y-axis direction is longer than the length Ly2 of the first current-carrying parts 113a and 113b in the Y-axis direction. The height of the protruding portion 172 from the substrate 82 in the Z-axis direction is greater than the height of the first current-carrying portions 113a and 113b from the substrate 82 in the Z-axis direction. Therefore, even if the conductive member attempts to enter within the predetermined interval H1, it first comes into contact with the end of the protruding portion 172, and is thus prevented from entering further.

[0053] [A pair of adjacent conductive parts spaced apart by a given distance H2] The second electric current conducting parts 114 each have a bolt 111c extending in the Z-axis direction and a nut 112c fastened to the bolt 111c. The second electric current conducting parts 114 each include a second electric current conducting part 114a disposed near the first electric current conducting part 113a. The second electric current conducting part 114a is disposed on a conductor 81 disposed on the bus bar frame 17. The conductor 81 is restricted in rotation by a wall part 85 protruding from the upper surface of the bus bar frame 17. The second electric current conducting part 114a is disposed in the Z-axis plus direction relative to the substrate 82 and the first electric current conducting part 113. The second electric current conducting part 114a and the first electric current conducting part 113a have different polarities. As shown in FIG. 5, the second electric current conducting part 114a and the first electric current conducting part 113a are disposed at a predetermined interval H2 in the Y-axis direction. In this case, the second current conducting portion 114a and the first current conducting portion 113a are an example of a pair of current conducting portions arranged with a predetermined distance H2 between them. Even in this case, the largest conductive member may enter within the predetermined distance H2 and come into contact with the second current conducting portion 114a and the first current conducting portion 113a at the same time, causing a short circuit. In order to prevent this interference, the outer lid 12 is provided with a protrusion 173.

[0054] FIG. 6 is a cross-sectional view showing the protruding portion 173 according to the embodiment. FIG. 7 is a perspective view showing the lid member 19 having the protruding portion 173 according to the embodiment. As shown in FIG. 6 and FIG. 7, the lid member 19 is a separate member from the outer lid 12 before assembly, but when it is attached to the second top surface portion 125 of the outer lid 12, it covers the second electric current portion 114a. The lid member 19 is provided with a protruding portion 173 at a position corresponding to the second electric current portion 114a. The protruding portion 173 is a wall that protrudes cylindrically from the lid member 19 in the negative Z-axis direction. The second electric current portion 114a is disposed inside the protruding portion 173. That is, the protruding portion 173 continuously surrounds the entire circumference of the second electric current portion 114 when viewed from the Z-axis direction. In this state, the protruding portion 173 protrudes in the negative Z-axis direction beyond the tip of the second electric current portion 114a. The end of the protruding portion 173 in the negative Z-axis direction is disposed via a gap S from the conductor 81, but may be in contact with the conductor 81. If the gap S is smaller than the thickness (length in the Z-axis direction) of the nut 112c of the second current-carrying portion 114a, the fallen nut 112c does not pass through the gap S. It is more preferable that the gap S is equal to or smaller than half the thickness of the nut 112c, and it is even more preferable that the gap S is equal to or smaller than ⅓ the thickness of the nut 112c. As a result, the entire circumference of the second current-carrying portion 114a is protected by the protruding portion 173, so that other conductive members are prevented from contacting the second current-carrying portion 114a. This prevents other conductive members from contacting the second current-carrying portion 114a and the first current-carrying portion 113a at the same time.

[0055] Furthermore, before the cover member 19 is attached to the second top surface portion 125, the protruding portion 173 is not disposed within the predetermined interval H2. Therefore, the second current-carrying portion 114a is entirely exposed, and the protruding portion 173 does not interfere with the operation of connecting the nut 112c to the bolt 111c that constitutes the second current-carrying portion 114a.

[0056] [Effects, etc.] As described above, according to the electricity storage device 1 of this embodiment, the protruding portion 172 that protrudes in the first direction (Z-axis direction) beyond the tip end of each of the first current-carrying portions 113a, 113b is provided between the pair of first current-carrying portions 113a, 113b (predetermined interval H1). Therefore, even if a conductive member (e.g., bolts 111a, 111b, 111c, washers 112a, nuts 112b, 112c, etc.) is about to enter between the pair of first current-carrying portions 113a, 113b, the protruding portion 172 can block the entry.

[0057] Meanwhile, a protruding portion 173 that protrudes in the first direction (Z-axis direction) beyond the tip of the second current conducting portion 114a is provided between the second current conducting portion 114a and the first current conducting portion 113a (at a predetermined distance H2), so that even if a conductive member is about to enter between the second current conducting portion 114a and the first current conducting portion 113a, the intrusion can be blocked by the protruding portion 173. As a result, a short circuit caused by the conductive member can be suppressed.

[0058] Since protrusion 172 is provided on substrate support portion 171, protrusion 172 and substrate support portion 171 have a continuous structure. In other words, even if a conductive member moves on substrate support portion 171, a gap is unlikely to occur between protrusion 172 and substrate support portion 171, and protrusion 172 can more reliably block the intrusion of the conductive member.

[0059] Since the protruding portion 173 is provided on the lid member 19 of the outer lid 12, the protruding portion 173 is not disposed between the second current-carrying portion 114a and the first current-carrying portion 113a before the lid member 19 is attached. This makes it possible to prevent the protruding portion 173 from getting in the way during the connection work for the second current-carrying portion 114a and the first current-carrying portion 113a.

[0060] Since the protrusion 172 penetrates the substrate 82 , the protrusion 172 can limit the displacement of the substrate 82 .

[0061] Since the protruding portion 173 surrounds more than half of the second current conducting portion 114a, it is possible to more reliably prevent the conductive member from coming into contact with the second current conducting portion 114a, thereby more reliably preventing a short circuit between the second current conducting portion 114a and the first current conducting portion 113a caused by the conductive member.

[0062] When the current-carrying part (second current-carrying part 114a) includes a bolt 111c extending in a first direction (Z-axis direction) and a nut 112c tightened to the bolt 111c, even if the nut 112c falls off the bolt 111c, the protrusions 172, 173 act as a barrier to prevent interference with other current-carrying parts.

[0063] As the pair of first current-carrying portions 113a, 113b are disposed within protruding portion 172 when viewed from the second direction (X-axis direction), each of first current-carrying portions 113a, 113b can be entirely shielded by protruding portion 172. Therefore, insulation of each of first current-carrying portions 113a, 113b by protruding portion 172 can be more reliably ensured.

[0064] [others] Although the power storage device according to the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. In other words, the embodiment disclosed here is illustrative and not restrictive in all respects, and the scope of the present invention includes all modifications within the meaning and scope of the claims. In the following description, the same parts as those in the above embodiment may be given the same reference numerals and their description may be omitted.

[0065] For example, in the above embodiment, the protrusion 172 is disposed within the predetermined interval H1 between the pair of first current-carrying portions 113a, 113b, and the protrusion 173 is disposed within the predetermined interval H2 between the second current-carrying portion 114a and the first current-carrying portion 113a. However, the protrusion may be disposed in any location between the pair of adjacent current-carrying portions with a predetermined interval therebetween.

[0066] In the above embodiment, the protrusion 173 surrounds the entire circumference of the second current-carrying portion 114a. However, when the protrusion surrounds the current-carrying portion, it is sufficient that the protrusion surrounds more than half of the current-carrying portion. Here, the protrusion surrounding more than half of the current-carrying portion means that the total circumference of the protrusion surrounding the circumference of the current-carrying portion is more than half of the circumference of the current-carrying portion as viewed from the Z-axis direction. FIG. 8 is a cross-sectional perspective view showing the protrusion 172a according to the first modification. In FIG. 8, the cover member 19 is omitted. FIG. 9 is a top view showing the protrusion 172a according to the first modification. In FIG. 9, the protrusion 172a is shown in a cross-sectional view. In FIG. 8 and FIG. 9, the protrusion 172a arranged between the pair of first current-carrying portions 113a and 113b surrounds more than half of the first current-carrying portion 113a as viewed from the Z-axis direction, while leaving a part of the first current-carrying portion 113a open. That is, the protruding portion 172a may surround the first electric current portion 113a by more than half a circumference in the circumferential direction centered on the first electric current portion 113a as viewed from the X-axis direction. Specifically, the protruding portion 172a of the first modification does not protrude from the substrate support portion 171 as shown in FIG. 8, but protrudes from the inner top surface of the outer lid 12 in the negative Z-axis direction. As shown in FIG. 9, one end of the protruding portion 172a is disposed between the pair of first electric current portions 113a and 113b. The protruding portion 172a extends from the one end while curving clockwise with the first electric current portion 113a as the approximate center. The other end of the protruding portion 172a is disposed in the positive Z-axis direction of the first electric current portion 113a. In this case, the protruding portion 172a is also disposed between the first electric current portion 113a and another first electric current portion 113c. That is, the protrusion 172a can prevent a conductive member from entering between the pair of first current-carrying portions 113a, 113c. In FIG. 8, the protrusion 172a continuously surrounds the first current-carrying portion 113a, but the protrusion 172a does not have to be continuous. For example, the protrusion 172a may be intermittently disposed on all four sides of the first current-carrying portion 113a. This allows the protrusion 172a to block the conductive member from entering between the pair of first current-carrying portions 113a, 113b from any direction, and also allows the weight of the protrusion 172a to be reduced.

[0067] In the above embodiment, the protrusion 172 is provided on the substrate support portion 171. However, the protrusion may be provided on the substrate. FIG. 10 is a perspective view showing the protrusion 172c according to the second modification. As shown in FIG. 10, the protrusion 172c is disposed between the first current-carrying portions 113a and 113c, and extends in the positive direction of the Z axis from the substrate 82c. The protrusion 172c is formed in a rectangular shape in a plan view, and is provided directly on the substrate 82c. In this case, since the protrusion 172c is provided in the housing portion 100c (the bus bar frame 17 and the outer lid 12), it can be said that the housing portion 100c includes the protrusion 172c. The protrusion 172c may be formed integrally with the substrate 82c, or may be a separate member attached to the substrate 82c. In the latter case, the protrusion 172c is combined with the substrate 82c by adhesion, welding, mechanical joining, or the like, and is integrated with the substrate 82c. In this way, the protrusion may be provided on a component of the power storage device other than the bus bar frame 17 and the outer lid 12, as long as the protrusion is provided inside the housing portion 100c.

[0068] In the above embodiment, the first current-carrying parts 113a and 113b having the bolt 111a and the washer 112a, the first current-carrying part 113 having the bolt 111b and the nut 112b, and the second current-carrying part 114 having the bolt 111c and the nut 112c are exemplified as the current-carrying parts. However, the current-carrying parts may be in any form as long as they are exposed in the Z-axis direction in the housing and are electrically connected to other electric components. Other examples of the current-carrying parts include bus bars.

[0069] In the above embodiment, the pair of first current conducting portions 113a, 113b are disposed inward from the protruding portion 172 when viewed from the second direction (X-axis direction) has been illustrated. However, only one of the first current conducting portions may be disposed inward from the protruding portion, or each of the pair of first current conducting portions may be disposed protruding from the protruding portion.

[0070] Any combination of the components included in the above embodiments is also within the scope of the present invention. [Industrial Applicability]

[0071] The present invention can be applied to an electricity storage device including an electricity storage element such as a lithium ion secondary battery. [Explanation of symbols]

[0072] 1. Energy storage device 10 Exterior body 11 Exterior body 11a Body opening 12 Outer lid 17 Busbar frame 18 Openings 19 Lid member 80 Connection Unit 81 Conductors 82, 82c board 85 Wall 91, 92 External terminals 100, 100c storage section 110 Electrical part 111a, 111b, 111c Bolts 112a Washer 112b, 112c Nut 113, 113a, 113b, 113c First current carrying part 114, 114a Second current carrying part 121 First top section 122 First outer surface 123 Terminal installation section 124 Terminal installation surface 125 Second top section 126 Second outer surface 171 Substrate support 172, 172a, 172c, 173 protrusion 200 Energy storage element 210 Container 240 Terminals 811 Notch H1, H2 interval Ly1, Ly2 length S Gap

Claims

1. A storage element; A substrate electrically connected to the energy storage element; a housing portion for housing the substrate, A pair of current-carrying parts are provided in the housing part, the pair of current-carrying parts being arranged at a predetermined interval and exposed in a first direction, At least one of the pair of current-carrying parts is disposed on the substrate, The housing portion includes a protruding portion disposed within the interval and protruding in the first direction, The protruding portion protrudes further than a tip end portion of at least one of the pair of current-carrying portions in the first direction. Energy storage device.

2. the accommodation unit includes a substrate support unit that supports the substrate, The protrusion is provided on the substrate support. The power storage device according to claim 1 .

3. The housing portion includes a cover member that covers at least one of the pair of current-carrying portions, The protrusion is provided on the cover member. The power storage device according to claim 1 .

4. The protrusion penetrates the substrate. The power storage device according to any one of claims 1 to 3.

5. The protruding portion surrounds more than half of at least one of the pair of current-carrying portions when viewed from the first direction. The power storage device according to any one of claims 1 to 3.

6. At least one of the pair of current-carrying parts includes a bolt extending in the first direction and a nut fastened to the bolt. The power storage device according to any one of claims 1 to 3.

7. When viewed from a second direction intersecting the first direction, the pair of current-carrying portions are disposed inside the protrusions. The power storage device according to any one of claims 1 to 3.

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