JP2014192365A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device capable of inhibiting a gas exhausted from a safety valve from hitting a pattern wiring board.SOLUTION: A power storage device 100 includes: power storage cells 10 each having a safety valve 13; a pattern wiring board 40 provided by being separated from the safety valves 13; and a plate-like member 30, provided between the safety valves 13 and the pattern wiring board 40, and facing the safety valves 13.

Description

  The present invention relates to an electricity storage device.

  There is known a sealed storage cell in which an electrode body including a positive electrode and a negative electrode is housed in an exterior body together with an electrolytic solution and sealed. As described in Patent Document 1, a plurality of such power storage cells are stacked. Such a plurality of stacked power storage cells are housed in, for example, a housing, and an IC substrate that controls the output voltage of the power storage cells is arranged outside the housing. However, since the demand for small modules has increased in recent years, a design such as housing a control board such as an IC board in a housing, or placing an IC board using an empty space in a stack of storage cells, etc. Is expected to occur.

  The storage cell is provided with a safety valve (gas discharge valve) for discharging the gas to the outside when the gas is generated in the sealed space. For this reason, in the configuration in which the safety valve of the storage cell and the pattern wiring board (IC board, etc.) are arranged to face each other, the gas discharged from the safety valve corrodes the wiring of the pattern wiring board and adversely affects the pattern wiring board. May affect.

  Therefore, there is a demand for an electricity storage device that can discharge gas to the outside without hitting the pattern wiring board by the gas discharged from the safety valve.

JP 2012-230963 A

  One of the objects according to some aspects of the present invention is to provide an electricity storage device capable of suppressing the gas discharged from the safety valve from hitting the pattern wiring board.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following aspects or application examples.

[Application Example 1]
One aspect of the electricity storage device according to the present invention is:
A storage cell having a safety valve;
A pattern wiring board provided apart from the safety valve;
A plate-like member provided between the safety valve and the pattern wiring board and facing the safety valve;
including.

[Application Example 2]
In application example 1,
A plurality of protrusions may be provided on the surface of the plate-like member on the safety valve side.

[Application Example 3]
In application example 2,
The safety valve, the plate-like member, and the pattern wiring board are provided side by side in a predetermined direction,
The protrusion has a surface inclined with respect to the predetermined direction,
The inclined surfaces of the plurality of protrusions may face the same direction.

[Application Example 4]
In application example 3,
The inclined surface may be inclined at 10 ° or more and 80 ° or less with respect to the predetermined direction.

[Application Example 5]
In application example 3 or 4,
A plurality of the storage cells are provided,
A plurality of the safety valves are arranged in a direction orthogonal to the predetermined direction,
A plurality of the protrusions may be provided corresponding to the plurality of safety valves.

[Application Example 6]
In any one of Application Examples 1 to 5,
The power storage cell, the pattern wiring board, and a housing that houses the plate-like member,
The housing is provided with an opening communicating with the outside,
The plate-like member may be provided to guide the gas to the opening when the gas is discharged from the safety valve.

[Application Example 7]
In Application Example 6,
An inter-cell isolation member housed in the housing and provided between the adjacent storage cells, further comprising:
The plate-like member may be fixed by engaging with the cell separation member and the casing.

[Application Example 8]
In Application Example 7,
The plate member may be a current plate.

[Application Example 9]
In any one of Application Examples 1 to 8,
The storage cell may be a lithium ion capacitor.

  In the electricity storage device according to the present invention, even when the gas is discharged from the safety valve, the plate-like member prevents the gas discharged from the safety valve from hitting the pattern wiring board (IC board, FPC / FFC, etc.). be able to. As a result, in the electricity storage device according to the present invention, it is possible to prevent the wiring of the pattern wiring board (IC board, FPC / FFC, etc.) from being corroded by the gas discharged from the safety valve.

Sectional drawing which shows typically the electrical storage device which concerns on this embodiment. The perspective view which shows typically the electrical storage device which concerns on this embodiment. The disassembled perspective view which shows typically the electrical storage device which concerns on this embodiment. The disassembled perspective view which shows typically the electrical storage device which concerns on this embodiment. The disassembled perspective view which shows typically the electrical storage device which concerns on this embodiment. The disassembled perspective view which shows typically the electrical storage device which concerns on this embodiment. The perspective view which shows typically the electrical storage device which concerns on this embodiment. The perspective view which shows typically the electrical storage cell of the electrical storage device which concerns on this embodiment. The perspective view which shows typically the electrical storage cell and cell separation member of the electrical storage device which concern on this embodiment. The top view which shows typically the plate-shaped member of the electrical storage device which concerns on this embodiment. Sectional drawing which shows typically the electrical storage device which concerns on this embodiment.

  Preferred embodiments of the present invention will be described below with reference to the drawings. It should be understood that the present invention is not limited only to the embodiments described below, and includes various modified examples that are implemented without departing from the scope of the present invention.

1. Power Storage Device The power storage device according to the present embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing an electricity storage device 100 according to this embodiment. FIG. 2 is a perspective view schematically showing the electricity storage device 100 according to this embodiment. 3 to 6 are exploded perspective views schematically showing the electricity storage device 100 according to the present embodiment. FIG. 7 is a perspective view schematically showing the electricity storage device 100 according to this embodiment. FIG. 8 is a perspective view schematically showing the power storage cell 10 of the power storage device 100 according to the present embodiment. FIG. 9 is a perspective view schematically showing the power storage cell 10 and the cell separation member 20 of the power storage device 100 according to the present embodiment. FIG. 10 is a perspective view schematically showing the plate-like member 30 of the electricity storage device 100 according to this embodiment.

  1 is a cross-sectional view taken along the line II shown in FIG. 4 to 6 are enlarged views of the area A shown in FIG. 3. FIG. 5 shows a state where the plate-like member 30 is placed. In FIG. 6, the pattern wiring board 40 is placed. It shows the placed state. Further, FIG. 9 shows a state where the storage cell 10 and the inter-cell isolation member 20 are separated. FIG. 10 is a plan view showing a surface of the plate-like member 30 on the safety valve 13 side (storage cell 10 side).

  Further, for convenience, in FIG. 1, the storage cell 10 is simplified, and the inter-cell isolation member 20 and the base 51 of the housing 50 are omitted. 1 to 10 and the following drawings, the X axis, the Y axis, and the Z axis are illustrated as three axes orthogonal to each other.

  As shown in FIGS. 1 to 10, the electricity storage device 100 includes an electricity storage cell 10, an inter-cell isolation member 20, a plate-like member 30, a pattern wiring substrate 40, a housing 50, a positive electrode output terminal 60, Negative output terminal 70.

  The storage cell 10 is, for example, a lithium ion capacitor, a lithium ion secondary battery, or an electric double layer capacitor. In particular, a lithium ion capacitor can have a large energy density and electrostatic capacity compared to an electric double layer capacitor, and can have a high level of safety unlikely to cause thermal runaway compared to a lithium ion secondary battery. . Therefore, it is suitably used as the storage cell 10. Below, the case where the electrical storage cell 10 is a lithium ion capacitor is demonstrated.

  "Lithium ion capacitor" uses a carbon-based material that can store lithium ions as a negative electrode material while using the principle of a general electric double layer capacitor, and improves the energy density by adding lithium ions to the negative electrode material. Capacitor.

  The storage cell 10 is accommodated in the housing 50. As shown in FIG. 4, a plurality of storage cells 10 are provided. In the illustrated example, a plurality of power storage cells 10 are arranged in the X-axis direction. The number of power storage cells 10 is not particularly limited. Adjacent power storage cells 10 may be connected in series via a bus bar (not shown), or may be connected in parallel.

  As shown in FIG. 8, the electricity storage cell 10 includes an exterior body 11, a sealing plate 12, a safety valve 13, a positive terminal plate 14, a negative terminal plate 15, a positive bolt 16, and a negative bolt 17. doing.

  Although not illustrated, the exterior body 11 contains an electrode body and an electrolytic solution. The shape of the exterior body 11 is not particularly limited as long as the electrode body and the electrolytic solution can be accommodated. In the illustrated example, the exterior body 11 has a substantially box-like shape whose thickness (length in the X-axis direction) is smaller than the horizontal width (length in the Y-axis direction) and the vertical width (length in the Z-axis direction). It has a shape. That is, the storage cell 10 is a square cell. The material of the exterior body 11 is, for example, aluminum, stainless steel, or iron.

  The form of the electrode body accommodated in the outer package 11 is not shown, but a sheet-like positive electrode, negative electrode, lithium electrode, and separator are stacked to form a laminated sheet, and the laminated sheet is wound. It may be a circular type. Alternatively, the electrode body is formed by stacking a sheet-like positive electrode, negative electrode, lithium electrode, and separator to form a laminated sheet, and laminating a plurality of the laminated sheets in the lamination direction of the positive electrode, the negative electrode, and the like. It may be. The electrode body is a power generation part of the storage cell 10.

As the electrolytic solution accommodated in the outer package 11, an aprotic organic solvent electrolyte solution containing lithium salt as an electrolyte is used. Examples of the aprotic organic solvent include ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, γ-butyrolactone, acetonitrile, dimethoxyethane, tetrahydrofuran, dioxolane, methylene chloride, sulfolane and the like. Examples of the lithium salt include LiPF ₆ , LiBF ₄ , LiClO ₄ , LiAsF ₆ , Li (C ₂ F ₅ SO ₂ ) ₂ N, and the like.

  The sealing plate 12 is provided in an opening formed above the exterior body 11 (in the example shown in the + Z-axis direction). The sealing plate 12 may be joined to the exterior body 11 by welding. The shape of the sealing plate 12 is not particularly limited as long as the opening of the exterior body 11 can be closed. The material of the sealing plate 12 is not particularly limited, and may be insulative or conductive. However, the positive terminal plate 14 and the negative terminal plate 15 may be configured not to be conducted by the sealing plate 12. 14 may be electrically connected to the sealing plate 12 and the negative electrode terminal 15 may be insulated from the sealing plate 12. For example, when the material of the sealing plate 12 is a metal such as aluminum, stainless steel, or iron, an insulating plate (not shown) made of resin or the like is provided between the sealing plate 12 and the terminal plates 14 and 15. .

  The safety valve 13 is provided on the sealing plate 12. Specifically, the safety valve 13 is provided in the through hole 12 a that penetrates the sealing plate 12. The through hole 12a penetrates the sealing plate 12 in the Z-axis direction. The through hole 12a is, for example, a cylindrical opening having an axis parallel to the Z axis as a central axis. Therefore, when the safety valve 13 is opened, the gas is injected in the Z-axis direction. In the illustrated example, the through hole 12 a is disposed in the center of the sealing plate 12. As shown in FIG. 4, a plurality of safety valves 13 are arranged in the X-axis direction.

The safety valve 13 is opened when the pressure in the sealed space formed by the exterior body 11 and the sealing plate 12 (inside the storage cell 10) rises above a predetermined value. The safety valve 13 has a through hole 12a.
It has a valve body (not shown) which closes. The valve body is a thin film that is destroyed at a predetermined pressure or a valve that is pressed against the valve seat by an elastic body so as to open at a predetermined pressure. When the safety valve 13 is opened, the inside of the electricity storage cell 10 is opened to the outside through the through hole 12a, and the gas inside the electricity storage cell 10 is released, so that an increase in pressure of the electricity storage cell 10 can be suppressed.

  As shown in FIG. 8, the positive terminal plate 14 is provided on the sealing plate 12. Although not shown, the positive electrode terminal plate 14 is connected to the electrode body through a positive electrode lead that penetrates the sealing plate 12. The material of the positive terminal plate 14 is, for example, aluminum.

  The negative electrode terminal plate 15 is provided on the sealing plate 12 so as to be separated from the positive electrode terminal plate 14. Although not shown, the negative electrode terminal plate 15 is connected to the electrode body through a negative electrode lead that penetrates the sealing plate 12. The material of the negative terminal plate 15 is, for example, copper, nickel, or aluminum.

  The positive electrode bolt 16 is fixed to the positive electrode terminal plate 14 and protrudes upward from the positive electrode terminal plate 14. The positive electrode bolt 16 may be joined to the positive electrode terminal plate 14 by welding. The material of the positive electrode bolt 16 is the same as the material of the positive electrode terminal plate 14, for example.

  The negative bolt 17 is fixed to the negative terminal plate 15 and protrudes upward from the negative terminal plate 15. The negative electrode bolt 17 may be joined to the negative electrode terminal plate 15 by welding. The material of the negative electrode bolt 17 is the same as the material of the negative electrode terminal plate 15, for example.

  As shown in FIGS. 4 and 9, the inter-cell isolation member 20 is provided between adjacent power storage cells 10. The material of the cell separating member 20 is, for example, a resin such as plastic. The inter-cell separating member 20 can electrically and thermally insulate adjacent power storage cells 10.

  The cell separation member 20 has a shape that covers the outer package 11 with the power storage cell 10 sandwiched from the X-axis direction. The inter-cell isolation member 20 is provided with a notch 21 corresponding to the shape of the safety valve 13. The storage cell 10 is housed in the housing 50 with the safety valve 13 and the bolts 16 and 17 exposed from the inter-cell isolation member 20. In the illustrated example, the shape of the notch 21 is a semicircle. The cell separation member 20 includes a bolt separation portion 22 and a plate-like member placement portion 24.

  The bolt isolation part 22 of the cell isolation member 20 is provided between the bolts 16 and 17 of one storage cell 10 and the bolts 16 and 17 of the other storage cell 10 of the adjacent storage cells 10. It has been. In the illustrated example, the bolt separation part 22 is a plate-like member, and the main surface (the surface having the largest area) faces the X-axis direction. The inter-bolt isolation part 22 can prevent the bolts 16 and 17 of the adjacent storage cells 10 from coming into contact with each other.

  The plate-like member placement portion 24 of the cell separation member 20 is provided in the vicinity of the bolt separation portion 22. As shown in FIG. 4, in the inter-cell separating members 20 adjacent to each other, the surfaces of the plate-like member mounting portions 24 facing the Z-axis direction are continuous with each other and extend in the X-axis direction. A plate-like member 30 is placed on the plate-like member placement portion 24. Specifically, the plate-like member 30 is placed on the surface of the plate-like member placement portion 24 that faces the Z-axis direction.

  In the present embodiment, the “plane facing the Z-axis direction” is a plane parallel to a plane (XY plane) constituted by the other two axes (X axis and Y axis), that is, an XY plane. A surface translated in the Z-axis direction. In other words, the “surface facing the Z-axis direction” is a surface having a perpendicular line parallel to the Z-axis. The same applies to “a surface facing the X-axis direction” and “a surface facing the Y-axis direction”.

  The plate member 30 is provided between the safety valve 13 and the pattern wiring board 40. The plate-like member 30 is placed on the plate-like member placement portion 24 so as to be separated from the storage cell 10. In the illustrated example, the plate-like member 30 is fixed on the plate-like member placement portion 24 by engaging with the bolt separation portion 22 of the cell separation member 20 and the base portion 51 of the housing 50. That is, the plate-like member 30 is fitted and fixed in a space defined by the bolt separating portion 22, the plate-like member placement portion 24, and the base portion 51. More specifically, the plate-shaped member 30 is in contact with the end surface facing the Y-axis direction of the bolt separating portion 22 and the inner surface 52a of the base 51 (the inner surface facing the X-axis direction), and the plate-shaped member mounting portion. 24 is fixed on.

  The plate-like member 30 is provided to face the safety valve 13. That is, the plate-like member 30 is provided so as to overlap with the safety valve 13 when viewed from the Z-axis direction. As shown in FIG. 5, the plate-like member 30 is provided to avoid the bolts 16 and 17 of the storage cell 10. Thereby, the electrical storage cell 10 and the pattern wiring board 40 can be electrically connected. As shown in FIG. 1, a plurality of protrusions 34 are provided on the surface 32 of the plate-like member 30 on the safety valve 13 side.

  The number of the protrusions 34 of the plate-like member 30 is not particularly limited, but in the illustrated example, a plurality of protrusions 34 are provided corresponding to the plurality of safety valves 13. That is, the number of protrusions 34 and the number of safety valves 13 are the same. The plurality of protrusions 34 are arranged in the X-axis direction. In the illustrated example, adjacent protrusions 34 are connected to each other. Adjacent protrusions 34 may be separated from each other as shown in FIG.

  As shown in FIG. 1, the projection 34 of the plate-like member 30 has a first surface 36 that is inclined with respect to the Z-axis direction (predetermined direction). That is, the first surface 36 is inclined with respect to the XY plane (a plane orthogonal to the predetermined direction). The first surface 36 is inclined at 10 ° or more and 80 ° or less with respect to the Z-axis direction. The first surfaces 36 of the plurality of protrusions 34 face the same direction. In the example shown in the drawing, the projecting portion 34 includes a first surface 36 and a second surface 37 parallel to the Z-axis direction (parallel to the YZ plane). The shape of the first surface 36 may be a rectangle having a long side parallel to the Y axis and a short side parallel to the X axis, as shown in FIG.

  As shown in FIG. 10, the protrusion 34 may not be provided on the contact surface 38 that contacts the plate-like member mounting portion 24 of the plate-like member 30. The contact surface 38 may be a flat surface. Thereby, the plate-shaped member 30 can be more reliably fixed on the plate-shaped member mounting portion 24. In the illustrated example, the shape of the contact surface 38 is a rectangle. The contact surface 38 is provided with the protrusion 34 interposed therebetween.

  The plate-shaped member 30 is provided so as to guide the gas to the opening 55 provided in the housing 50 when the gas is discharged from the safety valve 13. More specifically, when the safety valve 13 is opened, the gas is injected toward the Z-axis direction and hits the first surface 36 of the protrusion 34. Since the first surface 36 is inclined with respect to the Z-axis direction, the gas flow direction is changed by the first surface 36. In the illustrated example, the gas present on the first surface 36 flows in the −X axis direction. Then, the gas is discharged from the opening 55 to the outside. Thus, the plate-like member 30 is a current plate for adjusting the flow of fluid (specifically, gas discharged from the safety valve 13) to be constant. In addition, the arrow shown in FIG. 1 represents the flow of the gas exhausted from the safety valve 13.

  The thickness of the plate-like member 30 (the length in the Z-axis direction, specifically, the distance between the apex 35 of the protrusion 34 and the surface 39 on the pattern wiring board 40 side) is, for example, 5 mm or more and 20 mm or less. It is. The length of the plate member 30 in the X-axis direction is, for example, 30 mm or more and 300 mm or less, depending on the size of the storage cell 10 or the number of storage cells 10. The length of the plate member 30 in the Y-axis direction depends on the size of the storage cell 10, but is, for example, 50 mm or more and 150 mm or less.

  The plate member 30 is made of a material that is not corroded by the gas discharged from the safety valve 13. Specifically, the material of the plate-like member 30 is polyphenylene ether. Polyphenylene ether is not easily deformed even when a high-temperature gas is discharged from the safety valve 13, and the gas flow can be more reliably adjusted to a certain level.

  The pattern wiring board 40 is provided so as to be separated from the safety valve 13 (the storage cell 10). The pattern wiring board 40 is provided to face the plate-like member 30. The pattern wiring board 40 is provided on the side opposite to the storage cell 10 with respect to the plate-like member 30. Specifically, the pattern wiring board 40 is provided in the + Z-axis direction of the plate-like member 30, and the storage cell 10 is provided in the −Z-axis direction of the plate-like member 30. That is, the safety valve 13, the plate-like member 30, and the pattern wiring board 40 of the storage cell 10 are provided side by side in the Z-axis direction (predetermined direction).

  The pattern wiring board 40 is mounted on the pattern wiring board mounting portion 54 provided on the base 51 of the housing 50. In the example shown in FIGS. 4 and 5, the pattern wiring board mounting portion 54 has a rectangular parallelepiped shape. The pattern wiring board mounting portion 54 is provided on the inner surface (inner surface facing the Y-axis direction) 52b of the substrate 52. The pattern wiring board mounting portions 54 are arranged in the X-axis direction. Two rows of the patterned wiring board mounting portions 54 are provided with the storage cell 10 in between.

  Although not shown, a concave portion corresponding to the pattern wiring board mounting portion 54 may be provided on the surface of the pattern wiring board 40 on the plate-like member 30 side. The pattern wiring board 40 may be placed on the pattern wiring board mounting part 54 by engaging the recess with the pattern wiring board mounting part 54.

  The pattern wiring board 40 is electrically connected to the storage cell 10. Although not shown, when the conductive member fixed by the bolts 16 and 17 and the nut 2 and a land provided on the pattern wiring board 40 come into contact, the pattern wiring board 40 is electrically connected to the storage cell 10. It may be connected.

The pattern wiring board 40 is a plate-like IC board that constitutes an electronic circuit by fixing electronic parts such as integrated circuits (ICs) to the surface and connecting the parts with wirings. The pattern wiring board 40 can control the storage cell 10. Specifically, the pattern wiring board 40 can detect the output voltage of the storage cell 10. The pattern wiring board 40 can restore the output voltage when it is determined whether the detected output voltage of the storage cell 10 is normal and the output voltage is not normal. The pattern wiring board 40 is made of FPC (Flexible Printed).
It may be a Circuits substrate or an FFC (Flexible Flat Cable) substrate.

  The housing 50 accommodates the power storage cell 10, the cell separation member 20, the plate-like member 30, and the pattern wiring board 40. Although the shape of the housing | casing 50 will not be specifically limited if the electrical storage cell 10 grade | etc., Can be accommodated, in the example of illustration, it is a substantially box shape. The material of the housing 50 is, for example, a resin such as plastic. The housing 50 has a base 51 and a lid 57.

The base 51 has a container shape. The base 51 can arrange | position the electrical storage cell 10, the cell separation member 20, the plate-shaped member 30, and the pattern wiring board 40 inside. As shown in FIG. 4, the base 51 is provided with an opening 55 that communicates the inside and the outside of the base 51. Specifically, the opening 55 communicates the space between the cell isolation member 20 and the plate-like member 30 and the outside. The gas discharged from the safety valve 13 is discharged to the outside through the opening 55.

  The opening 55 communicates the space 55a between the inner surface 52a and the outer surface (outer surface) 53a of the base 51, the first through hole 55b that communicates the space 55a and the inside of the base 51, and the space 55a and the outside. A second through hole 55c is provided.

  The first through hole 55 b of the opening 55 passes through the inner surface 52 a of the base 51. The first through hole 55b is provided on an extended line of the safety valve 13 as viewed from the Z-axis direction. Thereby, the gas discharged | emitted from the safety valve 13 can be more reliably discharged | emitted through the opening part 55 outside. In the illustrated example, one first through hole 55b is provided, but the number is not particularly limited.

  The second through hole 55 c of the opening 55 passes through the outer surface 53 a of the base 51. The outer surface 53a is a surface facing in the opposite direction to the inner surface 52a. In the example shown in FIG. 7, twelve second through holes 55c are provided, but the number is not particularly limited. The second through hole 55c is provided at a position that does not overlap with the first through hole 55b when viewed from the X-axis direction. Therefore, impurities can be prevented from entering the inside of the base 51 from the outside through the opening 55.

  The lid 57 is provided by closing the opening of the container-like base 51. In the illustrated example, the lid portion 57 has a plate shape. On the inner surface 52a of the base portion 51, a lid portion placement portion 56 for placing the lid portion 57 is provided. The lid part 57 is joined to the base part 51 by, for example, an adhesive.

  The positive electrode output terminal 60 and the negative electrode output terminal 70 are provided on the outer surface (outer surface) 53b of the base 51 as shown in FIGS. The outer surface 53b is a surface (a surface facing the opposite side) different from the outer surface 53a provided with the second through hole 55c of the opening 55. Thereby, it can suppress that the gas discharged | emitted from the opening part 55 hits the output terminals 60 and 70. FIG. The output terminals 60 and 70 are provided apart from each other.

  The positive electrode output terminal 60 is electrically connected to the positive electrode bolt 16 of the storage cell 10. The material of the positive electrode output terminal 60 is, for example, copper subjected to aluminum, tin plating, or gold plating. The negative electrode output terminal 70 is electrically connected to the negative electrode bolt 17 of the storage cell 10. The material of the negative electrode output terminal 70 is, for example, copper plated with copper, nickel, aluminum, tin plating or gold plating. The shape of the output terminals 60 and 70 is not particularly limited. The power storage device 100 can apply a voltage to the external member from the output terminals 60 and 70.

  In the above example, the plate-like member 30 is described as being placed on the plate-like member placement portion 24 of the cell separation member 20. However, the plate-like member 30 is provided on the inner surface of the base portion 51. It may be placed on a placed placement part (not shown).

  In the above example, the pattern wiring board 40 is described as being placed on the pattern wiring board mounting portion 54 provided on the inner surface 52b of the base 51. However, the pattern wiring board 40 is isolated between cells. It may be placed on a placement portion (not shown) provided on the member 20.

  The power storage device 100 has the following characteristics, for example.

The electricity storage device 100 includes a plate-like member 30 provided between the safety valve 13 and the pattern wiring board 40 and facing the safety valve 13. Therefore, in the electricity storage device 100, even when the gas is discharged from the safety valve 13, the gas discharged from the safety valve 13 can be prevented from hitting the pattern wiring board 40 by the plate-like member 30. As a result, in the electricity storage device 100, it is possible to suppress the pattern wiring board 40 from being corroded by the gas discharged from the safety valve 13, and to suppress adverse effects on the pattern wiring board 40.

  For example, in the form in which the plate-like member is not provided, the wiring of the pattern wiring board may be corroded and short-circuited by the gas discharged from the safety valve, and the fuse may fly. When the fuse does not blow, overdischarge occurs, and gas may be discharged from the safety valves of other power storage cells.

  Furthermore, in the electricity storage device 100, even if the electrolyte is ejected together with the gas by opening the safety valve 13, the plate-like member 30 can suppress the pattern wiring board 40 from being immersed in the electrolyte.

  In the electricity storage device 100, the protrusion 34 of the plate-like member 30 has a first surface 36 that is inclined with respect to the Z-axis direction (predetermined direction), and the plurality of first surfaces 36 face the same direction. Yes. Therefore, in the electricity storage device 100, the flow of the gas discharged from the safety valve 13 can be adjusted to be constant and discharged to the outside by the plate-like member 30.

  In the electricity storage device 100, a plurality of protrusions 34 of the plate-like member 30 are provided corresponding to the plurality of safety valves 13. Therefore, in the electricity storage device 100, the flow of the gas discharged from the safety valve 13 can be adjusted to be constant and discharged to the outside by the plate-like member 30.

  In the electricity storage device 100, the plate-like member 30 is provided so as to guide the gas to the opening 55 provided in the housing 50 when the gas is discharged from the safety valve 13. Therefore, in the electricity storage device 100, the gas discharged from the safety valve 13 can be discharged to the outside from the opening 55.

  In the electricity storage device 100, the plate-like member 30 is fixed by engaging the inter-cell separating member 20 and the housing 50. Therefore, in the electricity storage device 100, the plate-like member 30 can be fixed with little effort (without taking time). Furthermore, in the electricity storage device 100, it is not necessary to use a fixing tool such as a screw to fix the plate-like member 30, and the cost can be reduced.

  For example, in a form in which a tubular exhaust duct for allowing gas discharged from the safety valve to pass through is fixed to each of the plurality of storage cells with a fixing tool such as a screw, it takes time to fix the tubular exhaust duct. In addition, a fixture for fixing the duct to each of the plurality of power storage cells is necessary, and the number of parts increases. As a result, the cost increases. Further, it is necessary to design the tubular exhaust duct accurately so as to be positioned at each safety valve, and high alignment performance is required, so that it is not simple in terms of design and installation work.

  In the electricity storage device 100, the electricity storage cell 10 is a lithium ion capacitor. Therefore, for example, the storage cell 10 can have a large energy density and capacitance compared to an electric double layer capacitor, and has high safety that is unlikely to cause thermal runaway compared to a lithium ion secondary battery. Can do.

In addition, this invention is not limited to said embodiment, A various deformation | transformation is possible. The present invention includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations that have the same functions, methods, and results, or configurations that have the same objects and effects). The present invention also includes a configuration in which a non-essential part of the configuration described in the above embodiment is replaced with another configuration. Furthermore, the present invention includes a configuration that achieves the same effects as the configuration described in the above embodiment or a configuration that can achieve the same object. Furthermore, the present invention includes a configuration obtained by adding a known technique to the configuration described in the above embodiment.

DESCRIPTION OF SYMBOLS 2 ... Nut, 10 ... Power storage cell, 11 ... Exterior body, 12 ... Sealing plate, 12a ... Through-hole, 13 ... Safety valve, 14 ... Positive electrode terminal plate, 15 ... Negative electrode terminal plate, 16 ... Positive electrode bolt, 17 ... Negative electrode bolt, DESCRIPTION OF SYMBOLS 20 ... Cell separation member, 21 ... Notch part, 22 ... Bolt separation part, 24 ... Plate member mounting part, 30 ... Plate member, 32 ... Surface, 34 ... Projection part, 35 ... Vertex, 36 ... 1st surface, 37 ... 2nd surface, 38 ... contact surface, 39 ... surface, 40 ... pattern wiring board, 50 ... housing, 51 ... base, 52a, 52b ... inner surface, 53a, 53b ... outer surface, 54 ... pattern wiring Substrate placing portion, 55 ... opening, 55a ... space, 55b ... first through hole, 55c ... second through hole, 56 ... lid placing portion, 57 ... lid portion, 60 ... positive output terminal, 70 ... negative electrode Output terminal, 100 ... electric storage device

Claims (9)

A storage cell having a safety valve;
A pattern wiring board provided apart from the safety valve;
A plate-like member provided between the safety valve and the pattern wiring board and facing the safety valve;
An electricity storage device. In claim 1,
The electricity storage device, wherein a plurality of protrusions are provided on a surface of the plate-like member on the safety valve side. In claim 2,
The safety valve, the plate-like member, and the pattern wiring board are provided side by side in a predetermined direction,
The protrusion has a surface inclined with respect to the predetermined direction,
The power storage device in which the inclined surfaces of the plurality of protrusions face in the same direction. In claim 3,
The power storage device, wherein the inclined surface is inclined at 10 ° to 80 ° with respect to the predetermined direction. In claim 3 or 4,
A plurality of the storage cells are provided,
A plurality of the safety valves are arranged in a direction orthogonal to the predetermined direction,
A plurality of the protrusions are provided corresponding to the plurality of safety valves. In any one of Claims 1 thru | or 5,
The power storage cell, the pattern wiring board, and a housing that houses the plate-like member,
The housing is provided with an opening communicating with the outside,
The plate-like member is an electricity storage device provided to guide the gas to the opening when the gas is discharged from the safety valve. In claim 6,
An inter-cell isolation member housed in the housing and provided between the adjacent storage cells, further comprising:
The power storage device, wherein the plate-like member is fixed by engagement with the cell isolation member and the housing. In claims 1-7,
The power storage device, wherein the plate-shaped member is a current plate. In any one of Claims 1 thru | or 8,
The electricity storage device, wherein the electricity storage cell is a lithium ion capacitor.

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