JP2023136828A - Power storage device - Google Patents

Abstract

To provide a power storage device that can improve vibration resistance or impact resistance.SOLUTION: A power storage device includes: a power storage element 100; a holder 200b that is aligned with the power storage element 100 in a first direction and holds the power storage element 100; and a case 300 that accommodates the power storage element 100 and the holder 200b. The case 300 has a case body 310 with an opening 310a formed on one side in a second direction orthogonal to the first direction and a bottom wall 311 on the other side in the second direction. At least one of the bottom wall 311 and a lid 320 that closes the opening 310a includes movement restriction portions 311a and 321a that restrict the movement of the holder 200b in at least one direction of the first direction and in a third direction orthogonal to the first direction and the second direction by coming into contact with the holder 200b.SELECTED DRAWING: Figure 6

Description

The present invention relates to a power storage device including a power storage element, a holder, and a case.

BACKGROUND ART Conventionally, power storage devices are widely known that include a power storage element, a holder that holds the power storage element, and a case that houses the power storage element and the holder. For example, Patent Document 1 discloses a power supply device (power storage device) in which a prismatic battery cell (power storage element) and a separator (holder) are housed in an outer case.

Japanese Patent Application Publication No. 2012-14962

In a power storage device in which a power storage element and a holder are housed in a case, movement of the power storage element and holder within the case is restricted to improve vibration resistance or impact resistance (resistance to external vibration or impact). It is hoped that However, in the above conventional power storage device, the power storage element and the holder move within the case, and there is a possibility that vibration resistance or impact resistance cannot be improved.

The present invention was made by the inventors of the present application newly paying attention to the above-mentioned problem, and an object of the present invention is to provide a power storage device that can improve vibration resistance or impact resistance.

A power storage device according to one aspect of the present invention includes a power storage element, a holder that is aligned with the power storage element in a first direction and holds the power storage element, and a case that houses the power storage element and the holder. , the case has a case body having an opening formed on one side in a second direction perpendicular to the first direction and a bottom wall on the other side in the second direction, the bottom wall, and At least one of the lids that closes the opening contacts the holder and moves the holder in at least one direction of the first direction and a third direction perpendicular to the first direction and the second direction. It has a movement restriction part that restricts the movement of.

According to the power storage device of the present invention, it is possible to improve vibration resistance or impact resistance.

FIG. 1 is a perspective view showing the configuration of a power storage device according to an embodiment. FIG. 2 is an exploded perspective view showing a power storage element and a spacer included in a power storage unit included in a power storage device according to an embodiment. FIG. 1 is a perspective view showing the configuration of a power storage element according to an embodiment. It is a perspective view and a top view showing the composition of the holder concerning an embodiment. FIG. 1 is a perspective view showing the configuration of a case (a case body and a lid body) according to an embodiment. FIG. 3 is a cross-sectional view showing the positional relationship between the case and the holder according to the embodiment. FIG. 7 is a cross-sectional view showing the configuration of a case and a holder according to Modification 1 of the embodiment. FIG. 7 is a cross-sectional view showing the configuration of a case and a holder according to a second modification of the embodiment. FIG. 7 is a cross-sectional view showing the configuration of a case and a holder according to a third modification of the embodiment.

A power storage device according to one aspect of the present invention includes a power storage element, a holder that is aligned with the power storage element in a first direction and holds the power storage element, and a case that houses the power storage element and the holder. , the case has a case body having an opening formed on one side in a second direction perpendicular to the first direction and a bottom wall on the other side in the second direction, the bottom wall, and At least one of the lids that closes the opening contacts the holder and moves the holder in at least one direction of the first direction and a third direction perpendicular to the first direction and the second direction. It has a movement restriction part that restricts the movement of.

According to this, in the power storage device, the power storage element and the holder are housed in the case, and at least one of the bottom wall and the lid of the case restricts movement of the holder in at least one of the first direction and the third direction. It has a movement restriction section. In this way, the movement restriction section provided on at least one of the bottom wall and the lid of the case restricts movement of the holder, thereby restricting movement of the holder within the case. As a result, it is possible to restrict the power storage element from moving together with the holder, so that the vibration resistance or impact resistance of the power storage device can be improved.

The holder includes a pair of first holder walls arranged on both sides of the electricity storage element in the second direction, and a pair of second holder walls arranged on both sides of the electricity storage element in the third direction. It may have.

According to this, the holder includes a pair of first holder walls and a pair of second holder walls, so that the energy storage element is surrounded on both sides of the energy storage element in the second direction and on both sides of the energy storage element in the third direction. Can be retained. As a result, the holder can stably hold the energy storage element and restrict the movement of the energy storage element to both sides in the second direction and both sides in the third direction, improving the vibration resistance or impact resistance of the energy storage device. It is possible to further improve the

The movement restriction section may restrict movement of the holder in both the first direction and the third direction.

According to this, the movement restriction section provided in the case restricts movement of the holder in both the first direction and the third direction, thereby further restricting movement of the holder within the case. Thereby, movement of the power storage element held by the holder in both the first direction and the third direction can be restricted, so that the vibration resistance or impact resistance of the power storage device can be further improved.

The movement restriction portion may be a convex portion inserted into a concave portion or a through hole formed on the holder, or a concave portion or a through hole into which a convex portion formed on the holder is inserted.

According to this, the movement restricting portion provided in the case is a convex portion inserted into a concave portion or a through hole of the holder, or a concave portion or a through hole into which a convex portion of the holder is inserted. Thereby, by inserting the protrusion into the recess or the through hole, the movement restricting part can be placed at a position where it contacts the holder, so the movement of the holder within the case can be restricted with a simple configuration. Therefore, with a simple configuration, it is possible to restrict movement of the power storage element held in the holder, so it is possible to easily realize a configuration that improves the vibration resistance or impact resistance of the power storage device.

The movement restriction section may be arranged on both the bottom wall and the lid.

According to this, movement of the holder within the case can be further restricted by disposing the movement restricting section on both the bottom wall and the lid of the case. This makes it possible to further restrict the movement of the power storage element held by the holder, thereby further improving the vibration resistance or impact resistance of the power storage device.

The movement restriction section may restrict movement of the holder by being fixed to the holder.

According to this, by fixing the movement restricting portion to the holder, movement of the holder can be more firmly restricted within the case. As a result, movement of the power storage element held by the holder can be more firmly restricted, so that the vibration resistance or impact resistance of the power storage device can be further improved.

Hereinafter, a power storage device according to an embodiment of the present invention (including variations thereof) will be described with reference to the drawings. The embodiments described below are all inclusive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, manufacturing steps, order of manufacturing steps, etc. shown in the following embodiments are merely examples, and do not limit the present invention. In each figure, dimensions etc. are not strictly illustrated. In each figure, the same or similar components are designated by the same reference numerals.

In the following description and drawings, the direction in which a pair of electrode terminals of a power storage element are arranged, the opposing direction of a pair of short sides in a container of a power storage element, or the direction in which power storage units are arranged is defined as the X-axis direction. The direction in which a pair of long sides of the power storage element container face each other, the thickness direction (flat direction) of the power storage element container, the direction in which a plurality of power storage elements are arranged in the power storage unit, or the power storage element and spacer (holder) in the power storage unit. The line direction is defined as the Y-axis direction. The protruding direction of the electrode terminal of the energy storage element, the alignment direction of the container body of the energy storage element and the container lid, the alignment direction of the case body and the lid of the case, the opposing direction of the opening and bottom wall of the case body, or the vertical direction is defined as the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect with each other (orthogonal in this embodiment). Depending on the usage mode, the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described as the vertical direction below.

In the following description, the X-axis plus direction refers to the arrow direction of the X-axis, and the X-axis minus direction refers to the opposite direction to the X-axis plus direction. When simply referred to as the X-axis direction, it refers to both or one of the X-axis plus direction and the X-axis minus direction. One side and the other side in the X-axis direction refer to one and the other of the X-axis plus direction and the X-axis minus direction. The same applies to the Y-axis direction and the Z-axis direction. Hereinafter, the Y-axis direction will also be referred to as the first direction, the Z-axis direction will also be referred to as the second direction, and the X-axis direction will also be referred to as the third direction. Expressions indicating relative directions or orientations, such as parallel and orthogonal, include cases where the directions or orientations are not strictly speaking. For example, when two directions are parallel, it does not only mean that the two directions are completely parallel, but also that they are substantially parallel, that is, they may differ by a few percent, for example. means. In the following description, when the expression "insulation" is used, it means "electrical insulation".

(Embodiment)
[1 Description of power storage device 1]
First, a schematic configuration of power storage device 1 in this embodiment will be described. FIG. 1 is a perspective view showing the configuration of a power storage device 1 according to the present embodiment. FIG. 1 shows the power storage device 1 with the lid 320 removed from the case body 310 of the case 300. Accordingly, in FIG. 1, two power storage units 10 arranged inside case 300 are illustrated. FIG. 2 is an exploded perspective view showing the power storage element 100 and spacer 200 included in the power storage unit 10 included in the power storage device 1 according to the present embodiment. FIG. 2 disassembles the components of the power storage unit 10 and illustrates two power storage elements 100 and three spacers 200 (two holders 200a and one holder 200b) located at the center of the power storage unit 10 in the Y-axis direction. It shows.

The power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside. The power storage device 1 is used for power storage, power supply, or the like. The power storage device 1 is used as a battery for driving or starting an engine of a mobile object such as an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. . Examples of the above-mentioned vehicles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and fossil fuel (gasoline, diesel oil, liquefied natural gas, etc.) vehicles. Examples of the above-mentioned railway vehicles for electric railways 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 or the like used for home or business purposes.

As shown in FIG. 1, power storage device 1 includes power storage unit 10 and case 300 that accommodates power storage unit 10. The power storage device 1 also includes external terminals (a positive external terminal and a negative external terminal) for electrically connecting to external devices, but illustrations and descriptions thereof are omitted. In addition to the above-described components, the power storage device 1 may also include electrical equipment such as a circuit board and a relay that monitor or control the charging state, discharging state, etc. of the power storage unit 10.

The power storage unit 10 is a battery module (battery assembly) having a plurality of power storage elements 100. The power storage unit 10 has a substantially rectangular parallelepiped shape that is long in the Y-axis direction by having a plurality of power storage elements 100 and spacers 200 alternately arranged in the Y-axis direction (first direction). In this embodiment, two power storage units 10 aligned in the X-axis direction are housed inside case 300. The power storage unit 10 includes a plurality of power storage elements 100 and a plurality of spacers 200 (holders 200a, 200b, and 200c). The power storage unit 10 also includes busbars that connect the power storage elements 100 in series or parallel, a busbar frame that holds the busbars, busbars that connect the power storage elements 100 and external terminals, etc., but illustration thereof is omitted. . The bus bar may connect all the power storage elements 100 in series, connect any of the power storage elements 100 in parallel and then connect them in series, or connect all the power storage elements 100 in parallel. It's okay.

The power storage element 100 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The power storage element 100 has a rectangular parallelepiped shape (square, rectangular shape) that is flat in the Y-axis direction. In this embodiment, a plurality of power storage elements 100 are arranged side by side in the Y-axis direction, but the number of power storage elements 100 arranged is not particularly limited, and may be one or several dozen. , or more. The size and shape of power storage element 100 are not particularly limited either, and may be an elongated cylinder, an elliptical cylinder, a cylinder, a polygonal cylinder other than a rectangular parallelepiped, or the like. The power storage element 100 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or a capacitor. The power storage element 100 may be not a secondary battery but a primary battery that allows the user to use the stored electricity without charging it. Power storage element 100 may be a battery using a solid electrolyte. The power storage element 100 may be a pouch type power storage element.

Spacer 200 is a member that is flat in the Y-axis direction and is arranged in line with power storage element 100 in the Y-axis direction, insulating and/or heat-insulating power storage element 100 and other members. The spacer 200 is an insulating plate or a heat insulating plate that is arranged in the positive Y-axis direction or the negative Y-axis direction of the power storage element 100 and insulates and/or heats the power storage elements 100 from each other or between the power storage element 100 and the case 300. The spacer 200 is made of 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), polyamide (PA), ABS resin , or an insulating member such as a composite material thereof, or a member having heat insulating properties such as mica.

The spacer 200 has walls on both sides of the power storage element 100 in the X-axis direction and on both sides of the Z-axis direction, thereby holding the power storage element 100 and functioning as a holder for positioning the power storage element 100. Therefore, the spacer 200 arranged at the center position in the Y-axis direction of the power storage unit 10 (between the two power storage elements 100 at the center position) is referred to as a holder 200b. Spacers 200 arranged at both ends of the power storage unit 10 in the Y-axis direction (between the end power storage element 100 and the case 300) are referred to as holders 200c. Spacer 200 arranged between holder 200b and holder 200c (between two power storage elements 100 at a position other than the center position) is referred to as holder 200a. Holders 200a, 200b, and 200c are arranged alternately with power storage elements 100. FIG. 2 shows a configuration in which two power storage elements 100, two holders 200a, and one holder 200b are alternately arranged around holder 200b.

Specifically, the holder 200a has walls on both sides in the X-axis direction and both sides in the Z-axis direction of two power storage elements 100 arranged on both sides in the Y-axis direction of the holder 200a, and holds the two power storage elements 100. This is an intermediate holder (intermediate spacer). Similarly, the holder 200b has walls on both sides in the X-axis direction and on both sides in the Z-axis direction of the two energy storage elements 100 disposed on both sides of the holder 200b in the Y-axis direction, and a center that holds the two energy storage elements 100. It is a plate (center holder or center spacer) (see Fig. 2). Holder 200b has a function of increasing the rigidity of power storage unit 10, which is long in the Y-axis direction. The holder 200c has walls on both sides in the X-axis direction and on both sides in the Z-axis direction of one power storage element 100 disposed on one side of the holder 200c in the Y-axis direction, and has an end holder (end holder) that holds the one power storage element 100. spacer).

That is, the power storage element 100 located at the center of the power storage unit 10 in the Y-axis direction is held by the holder 200a and the holder 200b (see FIG. 2). Power storage element 100 located at the end of power storage unit 10 in the Y-axis direction is held by holder 200a and holder 200c. Other power storage elements 100 are held by two holders 200a. All the spacers 200 (holders 200a, 200b, and 200c) may be made of the same material, or any of the spacers 200 may be made of different materials.

Case 300 is a substantially rectangular parallelepiped-shaped (box-shaped) container that constitutes an exterior body (outer shell) of power storage device 1 . Case 300 is arranged outside power storage unit 10, fixes power storage unit 10 in a predetermined position, and protects power storage unit 10 from impact and the like. The case 300 is a metal case formed of a metal member such as aluminum, aluminum alloy, stainless steel, iron, or plated steel plate. In this embodiment, case 300 is formed of aluminum die-casting (aluminum die-casting). Case 300 may be formed of an insulating member such as any resin material that can be used for spacer 200 included in power storage unit 10 .

As shown in FIG. 1, the case 300 includes a case body 310 that constitutes the main body of the case 300, and a lid body 320 that constitutes the lid body of the case 300. The case body 310 is a housing (casing) in which an opening 310a is formed in the Z-axis plus direction (one side in a second direction perpendicular to the first direction), and includes the power storage unit 10 (power storage element 100 and spacer 200 (holder)). 200a, 200b and 200c)). The lid body 320 is a flat rectangular member that closes the opening 310a of the case body 310. Two rectangular openings 310a arranged in the X-axis direction are formed in the case body 310, and after the power storage unit 10 is inserted through each opening 310a, the case body 310 and the lid body 320 are connected by bolts, etc. They are joined by screwing, welding, gluing, etc. As a result, the case 300 has a structure in which the inside is hermetically sealed. A terminal block for external terminals (a positive external terminal and a negative external terminal) may be attached to the case body 310 or the lid 320, and the external terminals may be arranged on the terminal block.

Next, the configurations of power storage element 100, spacer 200 (particularly holder 200b), and case 300 (case body 310 and lid 320) will be described in detail.

[1.1 Description of power storage element 100]
FIG. 3 is a perspective view showing the configuration of power storage element 100 according to this embodiment. FIG. 3 shows an enlarged view of the power storage element 100 shown in FIG. Since the plurality of power storage elements 100 included in power storage unit 10 all have the same configuration, one power storage element 100 is shown in FIG. 3, and the configuration of one power storage element 100 will be described in detail below.

As shown in FIG. 3, the power storage element 100 includes a container 110 and a pair of electrode terminals 140 (a positive electrode and a negative electrode). An electrode body, a pair of current collectors (a positive electrode and a negative electrode), and an electrolytic solution (non-aqueous electrolyte) are housed inside the container 110, and between the electrode terminal 140, the current collector, and the container 110. Although gaskets are arranged, illustration of these is omitted. The type of electrolytic solution is not particularly limited as long as it does not impair the performance of power storage element 100, and various types can be selected. The gasket may be made of any material as long as it has insulating properties. In addition to the above-mentioned components, the power storage element 100 includes a spacer placed on the side of the electrode body, an insulating film that wraps around the electrode body, an insulating film (such as a shrink tube) that covers the outer surface of the container 110, and the like. You can leave it there.

The container 110 is a rectangular parallelepiped (prismatic or box-shaped) case that includes a container body 120 with an opening formed therein and a container lid 130 that closes the opening of the container body 120. The container body 120 is a rectangular cylindrical member having a bottom and forming the main body portion of the container 110, and has an opening formed in the positive direction of the Z-axis. The container lid portion 130 is a rectangular plate-like member that is long in the X-axis direction and constitutes the lid portion of the container 110, and is arranged in the positive Z-axis direction of the container body 120. The container lid part 130 includes a gas discharge valve 131 that releases the pressure inside the container 110 when the pressure rises excessively, and a liquid injection part (Fig. (not shown) etc. are provided. The material of the container 110 (container main body 120 and container lid part 130) is not particularly limited, and may be a weldable (joinable) metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate. You can also use

After housing the electrode body and the like inside the container body 120, the container 110 is hermetically sealed (sealed) by joining the container body 120 and the container lid 130 by welding or the like. The container 110 has a pair of long sides 111 on both sides in the Y-axis direction, a pair of short sides 112 on both sides in the X-axis direction, and a bottom surface 113 on the negative side in the Z-axis direction. The long side surface 111 is a rectangular planar part that forms the long side surface of the container 110, and is arranged to face the adjacent spacer 200 in the Y-axis direction. The long side 111 is adjacent to the short side 112 and the bottom 113 and has a larger area than the short side 112. The short side surface 112 is a rectangular planar portion that forms the short side surface of the container 110, and is arranged to face the wall of the spacer 200 and the case 300 in the X-axis direction. The short side surface 112 is adjacent to the long side surface 111 and the bottom surface 113 and has a smaller area than the long side surface 111. The bottom surface 113 is a rectangular flat surface that forms the bottom surface of the container 110, and is arranged to face the wall of the spacer 200 and the bottom wall of the case 300 in the Z-axis direction. Bottom surface 113 is disposed adjacent to long side 111 and short side 112.

Electrode terminal 140 is a terminal member (a positive electrode terminal and a negative electrode terminal) of power storage element 100 that is arranged on container lid 130 . Specifically, the electrode terminal 140 is arranged so as to protrude from the upper surface (terminal arrangement surface) of the container lid part 130 in the Z-axis plus direction. The electrode terminal 140 is electrically connected to the positive electrode plate and the negative electrode plate of the electrode body via the current collector. In other words, the electrode terminal 140 is a metal terminal for guiding electricity stored in the electrode body to the external space of the power storage element 100 and for introducing electricity into the internal space of the power storage element 100 in order to store electricity in the electrode body. It is a manufactured member. The electrode terminal 140 is made of aluminum, aluminum alloy, copper, copper alloy, or the like.

The electrode body is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate has a positive electrode active material layer formed on a positive electrode base material layer, which is a current collector foil made of metal such as aluminum or an aluminum alloy. The negative electrode plate has a negative electrode active material layer formed on a negative electrode base material layer which is a current collecting foil made of metal such as copper or copper alloy. As the active material used for the positive electrode active material layer and the negative electrode active material layer, any known material can be used as appropriate as long as it is capable of intercalating and deintercalating lithium ions. As the separator, a microporous sheet made of resin, a nonwoven fabric, or the like can be used. In this embodiment, the electrode body is formed by stacking electrode plates (a positive electrode plate and a negative electrode plate) in the Y-axis direction. The electrode body is a wound type electrode body formed by winding electrode plates (positive electrode plate and negative electrode plate), and a laminated type (stack type) electrode formed by laminating multiple flat electrode plates. The electrode body may be in any form, such as a bellows-shaped electrode body in which a body or an electrode plate is folded into a bellows shape.

The current collector is a conductive current collecting member (a positive electrode current collector and a negative electrode current collector) that is electrically and mechanically connected to the electrode terminal 140 and the electrode body. The positive electrode current collector is made of aluminum or aluminum alloy, etc., like the positive electrode base material layer of the positive electrode plate of the electrode body, and the negative electrode current collector is made of copper or copper, like the negative electrode base material layer of the negative electrode plate of the electrode body. It is made of alloy, etc.

[1.2 Description of holder 200b]
Next, the configuration of the holder 200b of the spacer 200 will be described in detail. FIG. 4 is a perspective view and a top view showing the configuration of holder 200b according to this embodiment. Specifically, FIG. 4(a) is an enlarged perspective view of the holder 200b shown in FIG. 2, and FIG. 4(b) is an enlarged perspective view of the holder 200b shown in FIG. 4(a). FIG. 3 is a top view showing the configuration when viewed from the Z-axis plus direction.

As shown in FIG. 4, both ends of the holder 200b in the X-axis direction have the same shape. That is, the holder 200b has a shape that is symmetrical with respect to a plane passing through the center position and parallel to the YZ plane. The holder 200b includes a holder main body 210, a holder wall 220, and a through hole 230.

The holder main body 210 is a flat and rectangular portion that constitutes the main body of the holder 200b, and is arranged parallel to the XZ plane. Holder main body 210 is arranged between two power storage elements 100 located at the center of power storage unit 10 in the Y-axis direction. The holder main body 210 faces the long side surface 111 in the Y-axis direction so as to cover the entire surface of the long side surface 111 facing the holder main body 210, which the containers 110 of the two electricity storage elements 100 have. 111. The holder main body 210 is formed with a plurality of L-shaped grooves through which cooling gas (air) passes.

The holder wall portions 220 are walls arranged on both sides of the power storage element 100 in the Z-axis direction and on both sides of the X-axis direction. Specifically, holder wall portion 220 includes a pair of first holder wall portions 221 and 222 arranged on both sides of power storage element 100 in the Z-axis direction (second direction), and a pair of first holder wall portions 221 and 222 arranged on both sides of power storage element 100 in the X-axis direction (second direction). A pair of second holder wall parts 223 and a pair of second holder wall parts 224 are arranged on both sides of one direction and a third direction perpendicular to the second direction.

The first holder wall portion 221 is a flat plate-shaped portion that protrudes in the Y-axis direction from the end of the holder main body 210 in the Z-axis plus direction, and is arranged parallel to the XY plane. Specifically, a pair of first holder walls 221 are arranged at both ends of the holder 200b in the X-axis direction, and protrude from both ends of the holder main body 210 in the Z-axis positive direction to both sides in the Y-axis direction. ing. The first holder wall portion 221 is arranged along the container lid portion 130 of the container 110 of the power storage device 100 in the positive Z-axis direction of the power storage device 100 . Specifically, the first holder wall portion 221 is arranged in the Z-axis direction so as to cover approximately half of the container lid portion 130 on the Y-axis positive side or the Y-axis negative side at both ends of the power storage element 100 in the X-axis direction. is disposed facing the container lid part 130.

The first holder wall portion 222 is a flat plate-shaped portion that protrudes from the end of the holder body 210 in the Z-axis minus direction in the Y-axis direction, extends in the X-axis direction, and is arranged parallel to the XY plane. Specifically, a first holder wall portion 222 that protrudes from both sides in the Y-axis direction and extends in the X-axis direction is arranged from one end in the X-axis direction to the other end at the end in the negative Z-axis direction of the holder main body 210. ing. The first holder wall portion 222 is arranged along the bottom surface 113 of the container 110 of the power storage element 100 in the negative Z-axis direction of the power storage element 100 . Specifically, the first holder wall portion 222 extends from one end of the bottom surface 113 in the X-axis direction to the other end, and covers approximately half of the bottom surface 113 on the Y-axis positive direction side or the Y-axis negative direction side. It is arranged to face the bottom surface 113 in the Z-axis direction.

The second holder wall portion 223 is a flat plate-shaped portion that protrudes in the Y-axis direction from the end in the X-axis direction and the positive Z-axis direction of the holder main body 210, and is arranged parallel to the YZ plane. Specifically, a pair of second holder walls 223 are arranged at both ends of the holder 200b in the X-axis direction, and protrude from both ends of the holder main body 210 in the Z-axis positive direction to both sides in the Y-axis direction. ing. The second holder wall portion 223 is arranged along the short side surface 112 of the container 110 of the power storage element 100. Specifically, the second holder wall portion 223 covers approximately half of the short side surface 112 on the Y-axis positive direction side or the Y-axis negative direction side at the Z-axis positive direction end portions on both sides in the X-axis direction of the power storage element 100. The short side surface 112 is disposed opposite to the short side surface 112 in the X-axis direction.

The second holder wall portion 224 is a flat plate-shaped portion that protrudes in the Y-axis direction from the end in the X-axis direction and the negative Z-axis direction of the holder main body 210, and is arranged parallel to the YZ plane. Specifically, a pair of second holder walls 224 are arranged at both ends of the holder 200b in the X-axis direction, and protrude from both ends of the holder main body 210 in the Z-axis direction to both sides in the Y-axis direction. ing. The second holder wall portion 224 is arranged along the short side surface 112 of the container 110 of the power storage element 100. Specifically, the second holder wall portion 224 covers approximately half of the short side surface 112 on the Y-axis positive direction side or the Y-axis negative direction side at both ends of the power storage element 100 in the Z-axis negative direction. The short side surface 112 is disposed opposite to the short side surface 112 in the X-axis direction.

In this way, holder wall portion 220 is arranged to cover the four corners of power storage element 100 located at both ends of power storage element 100 in the Z-axis direction and at both ends of power storage element 100 in the X-axis direction. Thereby, holder 200b holds power storage element 100.

The through hole 230 is a portion that restricts movement of the holder 200b in at least one of the Y-axis direction (first direction) and the X-axis direction (third direction) by coming into contact with the case 300. A pair of through holes 230 are provided on both sides of the holder 200b in the X-axis direction. The through hole 230 in the X-axis positive direction is arranged at the end of the holder main body 210 in the X-axis positive direction, passes through the end in the X-axis positive direction in the Z-axis direction, and has a rectangular shape (square shape) when viewed from the Z-axis direction. ) is a through hole extending in the Z-axis direction. The through hole 230 in the negative X-axis direction is arranged at the end of the holder main body 210 in the negative X-axis direction, passes through the end in the negative X-axis direction in the Z-axis direction, and has a rectangular shape (square shape) when viewed from the Z-axis direction. ) is a through hole extending in the Z-axis direction.

That is, each through hole 230 is continuously formed in the holder body 210 from one end of the holder body 210 in the Z-axis direction to the other end within the width range of the holder body 210 in the Y-axis direction. . Each through hole 230 has a pair of rectangular flat surfaces (flat surfaces) parallel to the XZ plane and long in the Z axis direction on both sides of the inner surface in the Y axis direction; It has a pair of rectangular planes (flat surfaces) that are parallel and long in the Z-axis direction.

[1.3 Description of case 300]
Next, the configuration of the case 300 (the case body 310 and the lid 320) will be described in detail. FIG. 5 is a perspective view showing the configuration of case 300 (case body 310 and lid body 320) according to the present embodiment. Specifically, (a) of FIG. 5 is a perspective view showing the configuration of the case body 310 when viewed from above, and (b) of FIG. 5 is a perspective view of the configuration of the lid body 320 when viewed from below. FIG. FIG. 6 is a sectional view showing the positional relationship between case 300 and holder 200b according to the present embodiment. Specifically, FIG. 6 is a cross-sectional view showing the configuration of the case 300 in which the holder 200b is arranged, taken along a plane passing through the center of the holder 200b and parallel to the XZ plane. Since the half of the case 300 in the X-axis positive direction and the half in the X-axis negative direction have similar configurations, FIG. 6 shows the half in the X-axis positive direction, and the following explanation regarding FIG. This is done for half of the positive direction of the X-axis.

As shown in FIG. 5, the case body 310 includes a bottom wall 311 and case wall portions 312, 313, and 314. In other words, the case body 310 has a bottom wall 311 on the bottom in the negative Z-axis direction (the other side in the second direction), a pair of case walls 312 on both side surfaces in the X-axis, and A case wall portion 313 is provided at the center in the Y-axis direction, and a pair of case wall portions 314 are provided at side portions on both sides in the Y-axis direction. The case body 310 is a single member in which a bottom wall 311, two case walls 312, a case wall 313, and two case walls 314 are integrated. That is, the case main body 310 is integrally formed by aluminum die-casting or the like as one member (one piece).

The bottom wall 311 is a flat rectangular wall parallel to the XY plane and long in the Y-axis direction, which is arranged with its main surface facing the Z-axis direction (second direction) and forms the bottom surface of the case body 310. Department. The bottom wall 311 is arranged to face the power storage unit 10 (the power storage element 100 and the spacer 200 (holders 200a, 200b, and 200c)) in the Z-axis direction. Specifically, the bottom wall 311 is disposed in the negative Z-axis direction of the power storage unit 10 so as to cover the entire surface of the power storage unit 10 in the negative Z-axis direction, and supports the power storage unit 10 from the negative Z-axis direction. . Bottom wall 311 is disposed adjacent to case walls 312, 313, and 314.

The case wall portion 312 is arranged with its main surface facing in the X-axis direction (third direction), and is parallel to the YZ plane and forms a side surface (long side) in the X-axis direction of the case body 310 and in the Y-axis direction. It is a long, flat, rectangular wall (side wall). The case wall portion 312 is a wall portion that stands up in the Z-axis positive direction from the end in the X-axis direction of the bottom wall 311, and is connected to the power storage unit 10 (power storage element 100 and spacer 200 (holders 200a, 200b, and 200c)) in the X-axis direction. (third direction). Case wall 312 is adjacent to bottom wall 311 and case wall 314 . In this embodiment, two case walls 312 are disposed at both ends of the case body 310 in the X-axis direction, facing each other. The case wall portion 312 in the X-axis positive direction is arranged in the X-axis positive direction of the power storage unit 10 so as to cover the entire surface of the power storage unit 10 in the X-axis positive direction. The case wall portion 312 in the negative X-axis direction is arranged in the negative X-axis direction of the power storage unit 10 so as to cover the entire surface of the power storage unit 10 in the negative X-axis direction.

The case wall portion 313 is a rectangular parallelepiped-shaped wall portion that is disposed with its main surface facing in the X-axis direction (third direction), partitions the inner space of the case body 310, and is long in the Y-axis direction. The case wall portion 313 is a wall portion that rises in the positive direction of the Z-axis from the central portion of the bottom wall 311 in the (third direction). Specifically, case wall portion 313 is arranged between two power storage units 10 aligned in the X-axis direction. That is, the power storage device 1 includes a power storage element 100 and another power storage element 100 that is housed in a case 300 and is lined up with the power storage element 100 in the X-axis direction (third direction). The case wall portion 313 is a wall disposed between the power storage element 100 and the other power storage element 100 inside the case 300. Thereby, case wall portion 313 is arranged in the negative X-axis direction of power storage unit 10 so as to cover the entire surface of power storage unit 10 in the negative X-axis direction. Case wall portion 313 is arranged in the X-axis positive direction of power storage unit 10 so as to cover the entire surface of power storage unit 10 in the X-axis positive direction. Case wall 313 is adjacent to bottom wall 311 and case wall 314 .

The case wall portion 314 is arranged with its main surface facing in the Y-axis direction (first direction), and is parallel to the XZ plane and forms the side surface (short side) in the Y-axis direction of the case body 310. It is a long, flat, rectangular wall (side wall). The case wall portion 314 is a wall portion that rises in the Z-axis positive direction from the Y-axis direction end of the bottom wall 311, and faces the power storage unit 10 (the holder 200c of the spacer 200) in the Y-axis direction (first direction). will be placed. Case wall 314 is adjacent to bottom wall 311 and case walls 312 and 313. In this embodiment, two case walls 314 are disposed at both ends of the case body 310 in the Y-axis direction, facing each other. The case wall portion 314 in the Y-axis positive direction covers almost the entire surface of the power storage unit 10 (the holder 200c in the Y-axis positive direction) in the Y-axis positive direction. placed in the direction. The case wall portion 314 in the Y-axis negative direction covers almost the entire surface of the power storage unit 10 (the holder 200c in the Y-axis negative direction) in the Y-axis negative direction. placed in the direction.

With the above configuration, the case body 310 is formed with an opening 310a that opens toward the Z-axis plus direction (one side in the second direction). That is, the two case walls 312, the case wall 313, and the two case walls 314 form two openings 310a aligned in the X-axis direction. The opening 310a is a rectangular opening that is disposed at a position facing the bottom wall 311 of the case body 310 and is long in the Y-axis direction when viewed from the Z-axis direction. Opening 310a is arranged at a position facing power storage unit 10 in the Z-axis direction, and is formed in a size that allows power storage unit 10 to pass through in the Z-axis direction. In other words, the opening 310a is an opening in which the surface of the case body 310 in the positive Z-axis direction is open.

The lid 320 includes a lid wall 321 and case walls 322, 323, and 324. That is, the lid body 320 has a lid wall 321 on the top surface in the Z-axis plus direction (one side in the second direction), a pair of case walls 322 on both side surfaces in the X-axis direction, and A case wall portion 323 is provided at the center in the direction, and a pair of case wall portions 324 are provided at side portions on both sides in the Y-axis direction. The lid body 320 is one member in which a lid wall 321, two case walls 322, a case wall 323, and two case walls 324 are integrated. That is, the lid body 320 is integrally formed by aluminum die-casting or the like, and is integrally formed as one member (one piece).

The lid wall 321 is a flat rectangular wall parallel to the XY plane and long in the Y axis direction, which is arranged with its main surface facing the Z-axis direction (second direction) and forms the upper surface of the lid body 320. Department. The cover wall 321 is arranged to face the power storage unit 10 (the power storage element 100 and the spacer 200 (holders 200a, 200b, and 200c)) in the Z-axis direction. Specifically, the cover wall 321 is disposed in the positive Z-axis direction of the power storage unit 10 and covers the entire surface of the power storage unit 10 in the positive Z-axis direction. The lid wall 321 is arranged adjacent to the case walls 322, 323, and 324.

The case walls 322, 323, and 324 are flat, rectangular walls that are arranged to face the case walls 312, 313, and 314 of the case body 310 in the Z-axis direction. By connecting (joining) the case walls 322, 323, and 324 to the case walls 312, 313, and 314, the lid 320 is joined to the case body 310 and closes the opening 310a. The case walls 322, 323, and 324 have the same configuration as the case walls 312, 313, and 314, except that the length in the Z-axis direction is shorter than that of the case walls 312, 313, and 314, so the details are not explained here. Explanation will be omitted.

In the above configuration, at least one of the bottom wall 311 and the lid body 320 of the case body 310 comes into contact with the holder 200b, thereby moving the holder 200b in the Y-axis direction (first direction) and the X-axis direction (third direction). It has a movement restriction part that restricts movement in at least one direction. In this embodiment, the movement restricting section is arranged on both the bottom wall 311 and the lid 320. This movement restriction section will be specifically explained below.

The bottom wall 311 has a movement restriction portion 311a that restricts movement of the holder 200b in at least one of the Y-axis direction (first direction) and the X-axis direction (third direction) by contacting the holder 200b. ing. In this embodiment, the movement restricting portion 311a is a convex portion that protrudes from the bottom wall 311 in the Z-axis direction and is inserted into the through hole 230 formed in the holder 200b. The movement restricting part 311a has a rectangular parallelepiped shape (as seen from the Z-axis direction) that protrudes in the Z-axis plus direction from the surface of the bottom wall 311 in the Z-axis plus direction and extends in the Z-axis direction at the center of the bottom wall 311 in the Y-axis direction. It is a square-shaped protrusion (protrusion). The bottom wall 311 has two movement restriction parts 311a arranged in the X-axis direction corresponding to the two through holes 230 arranged in the X-axis direction formed in each of the two holders 200b of the two power storage units 10. , two sets are arranged side by side in the X-axis direction.

The movement restricting portion 311a is inserted into the through hole 230 of the holder 200b and comes into contact with the inner surface of the through hole 230. In other words, the movement limiting part 311a has rectangular planes (flat surfaces) parallel to the YZ plane and long in the Z axis direction on both sides of the X axis direction, and the holder is held in a position where the planes are oriented in the X axis direction. It faces the inner surface of the through hole 230 of 200b and contacts the inner surface of the through hole 230 in the X-axis direction (see FIG. 6). Similarly, the movement limiter 311a has rectangular planes (flat surfaces) parallel to the XZ plane and long in the Z axis direction on both sides in the Y axis direction, and the movement limiter 311a has a rectangular plane (flat surface) parallel to the XZ plane and long in the Z axis direction. It faces the inner surface of the through hole 230 of the holder 200b and comes into contact with the inner surface of the through hole 230 in the Y-axis direction. As a result, the movement restricting portion 311a contacts the holder 200b in both the Y-axis direction (first direction) and the X-axis direction (third direction), thereby allowing the movement limiter 311a to contact the holder 200b in both the Y-axis direction (first direction) and Movement in both the X-axis direction (third direction) is restricted.

Similarly, the lid body 320 comes into contact with the holder 200b, thereby restricting the movement of the holder 200b in at least one direction of the Y-axis direction (first direction) and the X-axis direction (third direction). have. In this embodiment, the movement restricting portion 321a is a convex portion that protrudes from the lid wall 321 of the lid body 320 in the Z-axis direction and is inserted into the through hole 230 formed in the holder 200b. The movement restricting part 321a has a rectangular parallelepiped shape (as seen from the Z-axis direction) that protrudes in the Z-axis minus direction from the surface of the cover wall 321 in the Z-axis minus direction and extends in the Z-axis direction at the center part of the cover wall 321 in the Y-axis direction. It is a square-shaped protrusion (protrusion). The lid body 320 has two movement restricting parts 321a arranged in the X-axis direction corresponding to the two through holes 230 arranged in the X-axis direction formed in each of the two holders 200b of the two power storage units 10. , two sets are arranged side by side in the X-axis direction. That is, each movement restriction part 321a is provided corresponding to each movement restriction part 311a of the bottom wall 311, and is arranged at a position facing each movement restriction part 311a in the Z-axis direction.

The movement restricting portion 321a is inserted into the through hole 230 of the holder 200b and comes into contact with the inner surface of the through hole 230. In other words, the movement limiting portion 321a has rectangular planes (flat surfaces) parallel to the YZ plane and long in the Z axis direction on both sides of the X axis direction, and the holder is held in a position where the planes are oriented in the X axis direction. It faces the inner surface of the through hole 230 of 200b and contacts the inner surface of the through hole 230 in the X-axis direction (see FIG. 6). Similarly, the movement limiter 321a has rectangular planes (flat surfaces) parallel to the XZ plane and long in the Z axis direction on both sides in the Y axis direction, and the movement limiter 321a has a rectangular plane (flat surface) parallel to the It faces the inner surface of the through hole 230 of the holder 200b and comes into contact with the inner surface of the through hole 230 in the Y-axis direction. As a result, the movement restricting portion 311a contacts the holder 200b in both the Y-axis direction (first direction) and the X-axis direction (third direction), thereby allowing the movement limiter 311a to contact the holder 200b in both the Y-axis direction (first direction) and Movement in both the X-axis direction (third direction) is restricted.

As shown in FIG. 6, two movement restriction parts 311a are inserted into the two through holes 230 of the holder 200b from the negative direction of the Z-axis, and two movement restriction parts 321a are inserted from the positive direction of the Z-axis. In this embodiment, the movement restricting parts 311a and 321a are press-fitted into the through hole 230 of the holder 200b, and the movement restricting parts 311a and 321a and the through hole 230 fit into each other. Thereby, the movement restricting parts 311a and 321a are fixed to the holder 200b, thereby restricting movement of the holder 200b. The movement restricting parts 311a and 321a are in contact with the inner surface of the through hole 230 on both sides in the Y-axis direction and both sides in the X-axis direction, and restrict movement of the holder 200b in both the Y-axis direction and both sides in the X-axis direction. In this way, the movement restricting parts 311a and 321a restrict the movement of the holder 200b in the direction orthogonal to the Z-axis direction, specifically, in at least two directions orthogonal to the Z-axis direction. In this embodiment, the movement restricting parts 311a and 321a restrict movement of the holder 200b in all directions perpendicular to the Z-axis direction.

The movement restricting portion 311a or 321a does not need to be in contact with the inner surface of the through hole 230 in the Y-axis direction or the X-axis direction, and may be disposed near the inner surface of the through-hole 230 in the Y-axis direction or the X-axis direction. (There may be a small gap between the inner surface of the through hole 230 and the inner surface of the through hole 230.) Even with this, if the holder 200b moves a little in the Y-axis direction or the You can restrict movement to. In this way, the movement restricting parts 311a and 321a may have any configuration as long as they restrict the movement of the holder 200b (position it) when they come into contact with the inner surface of the through hole 230. It can also be said that the movement restricting parts 311a and 321a are positioning parts that position the holder 200b in the Y-axis direction or the X-axis direction.

In the present embodiment, the power storage device 1 includes a holder 200a that is another holder that holds the power storage element 100 between the holder 200b and the holder 200a in the Y-axis direction (first direction) than the holder 200b. It is thin (see Figure 2). That is, the holder 200b has the through hole 230, but the holder 200a does not have the through hole 230, so the holder 200a can be formed thinner in the Y-axis direction than the holder 200b. Specifically, the holder body of the holder 200a is thinner in the Y-axis direction than the holder body 210 of the holder 200b. Thereby, the distance between the two power storage elements 100 sandwiching the holder 200a becomes smaller than the distance between the two power storage elements 100 sandwiching the holder 200b.

[2 Explanation of effects]
As described above, according to the power storage device 1 according to the present embodiment, the power storage element 100 and the holder 200b are housed in the case 300. At least one of the bottom wall 311 and the lid 320 (both in this embodiment) of the case 300 is configured to support the movement of the holder 200b in at least one of the first direction (Y-axis direction) and the third direction (X-axis direction). It has movement restriction parts 311a and 321a that restrict movement. In this way, the movement restricting parts 311a and 321a provided on at least one (both) of the bottom wall 311 and the lid 320 of the case 300 restrict the movement of the holder 200b, thereby making it possible for the holder 200b to move within the case 300. Movement can be restricted. Thereby, it is possible to restrict movement of power storage element 100 together with holder 200b, so it is possible to improve the vibration resistance or impact resistance of power storage device 1.

Since holder 200b can be positioned with respect to case 300 by movement restricting parts 311a and 321a, positioning of power storage element 100 and holder 200b can be improved when power storage element 100 and holder 200b are inserted into case 300. In particular, since the power storage unit 10 has a long length in the Y-axis direction and is difficult to position with respect to the case 300, it is highly effective to improve positioning performance. Since the movement of the holder 200b within the case 300 can be restricted without providing joining members such as bolts and nuts, there is no need for space for placing joining members, and there is no need for space for arranging tools for joining joining members. Therefore, the space of the power storage device 1 can be saved. The same applies to the following.

Since the holder 200b includes a pair of first holder walls 221 and 222, a pair of second holder walls 223, and a pair of second holder walls 224, the power storage element 100 can be moved in the second direction (Z-axis direction). The power storage element 100 can be held so as to surround the both sides of and both sides of the third direction (X-axis direction). As a result, the holder 200b can stably hold the power storage element 100, and can restrict movement of the power storage element 100 to both sides in the second direction (Z-axis direction) and to both sides in the third direction (X-axis direction). , it is possible to further improve the vibration resistance or impact resistance of the power storage device 1.

The movement restriction parts 311a and 321a provided in the case 300 restrict movement of the holder 200b in both the first direction (Y-axis direction) and the third direction (X-axis direction). The movement of the holder 200b can be further restricted. As a result, the movement of the power storage element 100 held in the holder 200b in both the first direction (Y-axis direction) and the third direction (X-axis direction) can be restricted, so that the vibration resistance of the power storage device 1 can be improved. Impact resistance can be further improved.

The movement restricting parts 311a and 321a provided in the case 300 are made into convex parts inserted into the through hole 230 of the holder 200b. As a result, by inserting the convex portions serving as the movement limiting portions 311a and 321a into the through holes 230, the movement limiting portions 311a and 321a can be placed at positions where they come into contact with the holder 200b. movement of the holder 200b can be restricted. Therefore, with a simple configuration, movement of power storage element 100 held in holder 200b can be restricted, so a configuration that improves the vibration resistance or impact resistance of power storage device 1 can be easily realized. By making the movement restricting parts 311a and 321a provided on the bottom wall 311 and the lid wall 321 of the case 300 into convex parts instead of recessed parts, the thickness of the bottom wall 311 and the lid wall 321 can be reduced, so that the power storage device 1 can be saved. You can create more space.

By disposing the movement restricting parts 311a and 321a on both the bottom wall 311 and the lid 320 of the case 300, movement of the holder 200b within the case 300 can be further restricted. Thereby, movement of power storage element 100 held in holder 200b can be further restricted, so that the vibration resistance or impact resistance of power storage device 1 can be further improved.

By fixing the movement restricting parts 311a and 321a to the holder 200b by press fitting (fitting), the movement of the holder 200b within the case 300 can be more firmly restricted. In particular, by fixing the movement restricting parts 311a and 321a to the holder 200b, the holder can be moved not only in the first direction (Y-axis direction) and third direction (X-axis direction) but also in the second direction (Z-axis direction). Movement of 200b can be restricted. Thereby, movement of power storage element 100 held in holder 200b can be more firmly restricted, so that the vibration resistance or impact resistance of power storage device 1 can be further improved.

[3 Description of modification]
Although the power storage device 1 according to the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. The embodiments disclosed this time are illustrative in all respects, and the scope of the present invention includes all changes within the meaning and range equivalent to the scope of the claims.

In the above embodiment, the movement restricting parts 311a and 321a of the case 300 are convex parts and are inserted into the through hole 230 of the holder 200b, but the present invention is not limited thereto. In place of the through hole 230, the holder 200b is formed with a recess that is recessed in the Z-axis direction at the position of the through hole 230, and the movement restricting parts 311a and 321a can be inserted into the recess formed in the holder 200b. good. That is, a concave portion recessed in the Z-axis positive direction is formed at the end of the holder 200b in the Z-axis negative direction, and the movement restricting portion 311a is inserted into the concave portion, and the Z-axis A recessed portion recessed in the negative direction may be formed, and the movement restricting portion 321a may be inserted into the recessed portion. As described above, the movement restricting portion 311a or 321a may be a convex portion inserted into a recess or a through hole formed in the holder 200b. Alternatively, it may take various other forms. Other modifications will be specifically explained below.

(Modifications 1 and 2)
FIG. 7 is a sectional view showing the configuration of a case 300A and a holder 200b according to Modification 1 of the present embodiment. FIG. 8 is a sectional view showing the configuration of a case 300B and a holder 200b according to a second modification of the present embodiment. 7 and 8 are diagrams corresponding to FIG. 6.

As shown in FIG. 7, the case 300A in Modification 1 includes a pair of movement restriction parts 311b in place of the pair of movement restriction parts 311a of the bottom wall 311 of the case body 310 in the above embodiment. The case 300A does not have the pair of movement restricting parts 321a of the lid wall 321 of the lid body 320 in the above embodiment. The other configurations of this modification are the same as those of the above embodiment, so detailed explanations will be omitted.

The movement restricting portion 311b is a protruding portion that protrudes from the surface of the bottom wall 311 in the Z-axis positive direction and extends in the Z-axis direction, and extends in the Z-axis direction through the through hole 230 of the holder 200b. Placed. In other words, the movement restriction section 311b has a shape similar to that of the movement restriction section 311a in the above embodiment extended in the positive Z-axis direction. The movement restricting portion 311b has a male threaded portion in a portion passing through the through hole 230 at the end in the positive Z-axis direction, and has a nut 311c coupled to the male threaded portion. In this way, by being fixed to the holder 200b, the movement restricting section 311b fixes the holder 200b to the case 300A and restricts the movement of the holder 200b. Note that the nut 311c is disposed at the end of the movement restriction part 311b in the Z-axis positive direction, and is tightened to the male threaded part of the movement restriction part 311b while contacting the end of the holder 200b in the Z-axis positive direction. The movement of 200b is restricted not only in the X-axis direction and the Y-axis direction, but also in the Z-axis direction.

As shown in FIG. 8, the case 300B in the second modification has a pair of movement restriction parts 311d in place of the pair of movement restriction parts 311a of the bottom wall 311 of the case body 310 in the above embodiment. The case 300B does not have the pair of movement restricting parts 321a of the lid wall 321 of the lid body 320 in the above embodiment. The other configurations of this modification are the same as those of the above embodiment, so detailed explanations will be omitted.

The movement limiter 311d has a bolt that passes through the through hole 230 of the holder 200b in the Z-axis direction. The movement limiting portion 311d further includes a recess 311e in which a female threaded portion is formed to be coupled to the male threaded portion of the bolt. In other words, this modification has a configuration similar to that of the case 300A of the first modification, in which the movement restricting portion 311b is separated from the bottom wall 311. In this way, by being fixed to the holder 200b, the movement restricting section 311d fixes the holder 200b to the case 300B and restricts the movement of the holder 200b. The movement restricting portion 311d includes a convex portion (formed with a female screw portion) that protrudes from the bottom wall 311 and is inserted into the through hole 230 of the holder 200b, and a convex portion (formed with a female screw portion) that is inserted into the through hole 230 and is coupled to the female screw portion of the convex portion. It may have a bolt.

In Modifications 1 and 2, the cases 300A and 300B do not need to have the lid 320. Alternatively, in Modifications 1 and 2, the lid 320 may be provided with a movement restriction portion similar to the movement restriction portions 311b and 311d of the case body 310, and the holder 200b may be fixed to the lid 320. Also in this case, the movement restricting section is fixed to the holder 200b, thereby fixing the holder 200b to the cases 300A and 300B, and restricting the movement of the holder 200b.

(Modification 3)
FIG. 9 is a cross-sectional view showing the configuration of a case 300C and a holder 201 according to a third modification of the present embodiment. FIG. 9 is a diagram corresponding to FIG. 6.

As shown in FIG. 9, a case 300C in this modification has a pair of movement restriction parts 311f in place of the pair of movement restriction parts 311a of the bottom wall 311 of the case body 310 in the above embodiment, and a lid body In place of the pair of movement restriction parts 321a of the cover wall 321 of 320, it has a pair of movement restriction parts 321b. The holder 201 has a pair of protrusions 231 and a pair of protrusions 232 instead of the pair of through holes 230 in the above embodiment. The other configurations of this modification are the same as those of the above embodiment, so detailed explanations will be omitted.

The movement restriction portion 311f is a recess into which the projection 231 is inserted, and the movement restriction portion 321b is a recess into which the projection 232 is inserted. In this modification, the movement restricting portion 311f is a recess extending in the Z-axis direction and having a rectangular shape (square shape) when viewed from the Z-axis direction, where the surface of the bottom wall 311 in the Z-axis positive direction is recessed in the Z-axis negative direction. be. The movement restricting portion 321b is a concave portion extending in the Z-axis direction and having a rectangular shape (square shape) when viewed from the Z-axis direction, in which a surface of the cover wall 321 in the Z-axis minus direction is recessed in the Z-axis plus direction. The convex portion 231 is a rectangular parallelepiped-shaped (square-shaped when viewed from the Z-axis direction) protrusion (protrusion) that protrudes from the holder main body 210 in the Z-axis minus direction and extends in the Z-axis direction. The convex portion 232 is a rectangular parallelepiped-shaped (square-shaped when viewed from the Z-axis direction) protrusion (protrusion) that protrudes from the holder main body 210 in the Z-axis plus direction and extends in the Z-axis direction.

The movement restricting portion 311f may be a through hole passing through the bottom wall 311 in the Z-axis direction, and the convex portion 231 of the holder 201 may be inserted into the through hole. The movement restricting portion 321b may be a through hole that penetrates the lid wall 321 in the Z-axis direction, and the convex portion 232 of the holder 201 may be inserted into the through hole. In this case, the protrusion 231 may have a male threaded portion formed at its tip, and may be joined to the nut after passing through the bottom wall 311. The same applies to the convex portion 232.

As described above, the power storage device 1 according to Modifications 1 to 3 can achieve the same effects as the above embodiment. In particular, in Modifications 1 and 2, movement of the holder 200b can be more firmly restricted within the cases 300A and 300B by fixing the movement restricting parts 311b and 311d to the holder 200b. Thereby, movement of power storage element 100 held in holder 200b can be more firmly restricted, so that the vibration resistance or impact resistance of power storage device 1 can be further improved.

In the third modification, the movement restricting parts 311f and 321b provided in the case 300C are recessed parts (or through holes) into which the convex parts 231 and 232 of the holder 201 are inserted. As a result, by inserting the protrusions 231 and 232 into the recesses (or through holes) serving as the movement restriction parts 311f and 321b, the movement restriction parts 311f and 321b can be placed at positions where they contact the holder 201, resulting in a simple configuration. Therefore, movement of the holder 201 within the case 300C can be restricted. Therefore, with a simple configuration, movement of power storage element 100 held in holder 201 can be restricted, so a configuration that improves the vibration resistance or impact resistance of power storage device 1 can be easily realized.

In the above embodiment and modification 3, the movement restriction section is not limited to being disposed on both the case body 310 and the lid 320, and may not be disposed on one of the case body 310 and the lid 320. Good too. If the movement restriction part is not disposed on the lid 320, the case does not need to have the lid 320. In the above-mentioned embodiments and modifications 1 to 3, the shape of the movement restricting portion when viewed from the Z-axis direction is not particularly limited, and may be a circular shape, an elliptical shape, an elliptical shape, a polygonal shape other than a rectangular shape, etc. good. The same applies to the shape of the through hole of the holder. The movement restricting portion may be a convex portion inserted into a concave portion or a through hole formed on the holder, or a concave portion or a through hole into which a convex portion formed on the holder is inserted. Alternatively, the movement restricting portion may be a convex portion that contacts the side surface of the holder in the Y-axis direction or the X-axis direction, or may be two convex portions that sandwich the side surface of the holder in the Y-axis direction or the X-axis direction. It may also be a stepped portion that contacts the side surface. With these, the same effects as in the above embodiment can be achieved.

(Other variations)
In the above embodiment, the movement restricting parts 311a and 321a provided in the case 300 are fixed to the holder 200b, and are fixed to the holder 200b in both the first direction (Y-axis direction) and the third direction (X-axis direction). We have decided to restrict movement to, but are not limited to. The movement restricting portion 311a or 321a does not have to be fixed to the holder 200b, and does not have to restrict the movement of the holder 200b in either the first direction (Y-axis direction) or the third direction (X-axis direction). good.

In the above embodiment, it has been explained that the movement of the holder 200b in the X-axis direction and the Y-axis direction can be restricted by fixing the movement restriction parts 311a and 321a to the holder 200b by press fitting (fitting). It is also possible to restrict movement of the holder 200b in the Z-axis direction depending on the degree to which the restricting portions 311a and 321a are press-fitted (fitted) into the holder 200b.

In the above embodiment, two power storage units 10 arranged in the X-axis direction are housed inside the case 300, but three or more power storage units 10 arranged in the X-axis direction are housed inside the case 300. Alternatively, only one power storage unit 10 may be accommodated. A plurality of power storage units 10 arranged in the Y-axis direction may be housed inside the case 300.

In the above embodiment, the case main body 310 has a sufficient height in the Z-axis direction to accommodate the power storage unit 10, and is configured so that the power storage unit 10 is not exposed when viewed from the XY plane. However, this is not essential. isn't it. The case body 310 has a height of about two-thirds or half of the power storage unit 10 in the Z-axis direction, and accommodates a portion of the power storage unit 10 in the Z-axis negative direction, and a height of the power storage unit 10 in the Z-axis positive direction. The site may be exposed without being contained. In this case, cover body 320 may have a height of approximately one-third or half of power storage unit 10 in the Z-axis direction to accommodate a portion of power storage unit 10 in the Z-axis plus direction.

In the above embodiment, the holder 200b has a pair of first holder walls 221 and 222, a pair of second holder walls 223, and a pair of second holder walls 224. It is not limited to having all of the wall portions. Holder 200b may have any configuration as long as it can hold power storage element 100 by having at least one of these wall portions.

In the above embodiment, the holder 200b is described as being located at the center in the Y-axis direction, but this is not essential. The holder 200b may be disposed biased toward the positive Y-axis direction or the negative Y-axis direction, and the number of power storage elements 100 and holders 200a may be different in the Y-axis positive direction and the Y-axis negative direction from the holder 200b accordingly. It's okay.

In the above embodiments and modifications, for example, in FIGS. 6 to 9, the holders 200b and 201 are described so that the side surfaces in the X-axis direction contact the case walls 312 and 313, but the holders 200b and 201 are A gap may be provided between the case walls 312 and 313 without contacting the walls 312 and 313.

In the above embodiment, the holder 200a is thinner than the holder 200b, but it may be thicker than the holder 200b, or may have the same thickness as the holder 200b.

In the above embodiment, the holders 200b of all power storage units 10 have the above configuration, but the holder 200b of any power storage unit 10 does not have to have the above configuration. In the holder 200b, both sides in the X-axis direction have the above configuration, but one side in the X-axis direction may not have the above configuration.

In the above embodiment, the holder 200b has the above configuration in which movement is restricted by the case 300, but the holder 200a or 200c may have the same configuration as the holder 200b. In this case, a movement restricting portion 311a and the like are arranged in the case 300 in correspondence with the holder 200a or 200c.

In the embodiment described above, the spacers 200 (holders 200a, 200b, and 200c) are arranged alternately in line with the power storage element 100 in the Y-axis direction, but a configuration in which any of the spacers 200 is not arranged may also be used. A configuration may be adopted in which only one spacer 200 (holder 200a, 200b, or 200c) is disposed.

In the above embodiment, the power storage unit 10 may include a restraining member (end plate, side plate, etc.) that restrains the plurality of power storage elements 100 and the spacer 200.

Embodiments constructed by arbitrarily combining the constituent elements of the embodiments and their modifications are also included within the scope of the present invention.

INDUSTRIAL APPLICATION This invention is applicable to the electrical storage device etc. which are equipped with electrical storage elements, such as a lithium ion secondary battery.

1 Power storage device 10 Power storage unit 100 Power storage element 110 Container 111 Long side 112 Short side 113 Bottom 140 Electrode terminal 200 Spacer 200a, 200b, 200c, 201 Holder 210 Holder main body 220 Holder wall 221 First holder wall 222 First holder wall Part 223 Second holder wall 224 Second holder wall 230 Through hole 231, 232 Convex portion 300, 300A, 300B, 300C Case 310 Case body 310a Opening 311 Bottom wall 311a, 311b, 311d, 311f, 321a, 321b Movement restriction Part 311c Nut 311e Recess 312, 313, 314, 322, 323, 324 Case wall 320 Lid body 321 Lid wall

Claims (6)

A power storage element,
a holder that is aligned with the power storage element in a first direction and holds the power storage element;
a case that accommodates the electricity storage element and the holder;
The case has a case body having an opening formed on one side in a second direction perpendicular to the first direction and a bottom wall on the other side in the second direction,
At least one of the bottom wall and the lid that closes the opening is in contact with the holder, so that the first direction and the third direction perpendicular to the first direction and the second direction of the holder are arranged. A power storage device including a movement restriction section that restricts movement in at least one direction. The holder is
a pair of first holder walls arranged on both sides of the electricity storage element in the second direction;
The power storage device according to claim 1 , further comprising: a pair of second holder wall portions arranged on both sides of the power storage element in the third direction. The power storage device according to claim 1 or 2, wherein the movement restriction section restricts movement of the holder in both the first direction and the third direction. Any one of claims 1 to 3, wherein the movement restricting portion is a convex portion inserted into a concave portion or a through hole formed on the holder, or a concave portion or a through hole into which a convex portion formed on the holder is inserted. The power storage device according to item (1). The power storage device according to any one of claims 1 to 4, wherein the movement restriction section is arranged on both the bottom wall and the lid. The power storage device according to any one of claims 1 to 5, wherein the movement restriction section restricts movement of the holder by being fixed to the holder.

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