JP2023136738A - 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 1 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 includes a case body 310 in which an opening 310a is formed in a second direction orthogonal to the first direction, and which accommodates the power storage element 100 and the holder 200b. The case 300 has a case wall portion 312 or 313 that faces the holder 200b in a third direction orthogonal to the first direction and the second direction, and the case wall portion 312 or 313 includes a movement restriction portion 312a or 313a that limits the movement of the holder 200b in the first 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 an opening formed in a second direction orthogonal to the first direction. a case body that accommodates the electricity storage element and the holder; the case has a case wall that faces the holder in a third direction orthogonal to the first direction and the second direction; The case wall has a movement restriction portion that restricts movement of the holder in the first direction by contacting the holder.

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. FIG. 2 is a perspective view showing the configuration of a holder according to an embodiment. FIG. 1 is a perspective view and a top view showing the configuration of a case main body according to an embodiment. FIG. 3 is a top view and a cross-sectional view showing the positional relationship between the case body and the holder according to the embodiment. FIG. 7 is a cross-sectional view showing the configuration of a case body and a holder according to Modification 1 of the embodiment. FIG. 7 is a cross-sectional view showing the configuration of a case body and a holder according to a second modification of the embodiment. FIG. 7 is a cross-sectional view showing the configuration of a case body 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 an opening formed in a second direction orthogonal to the first direction. a case body that accommodates the electricity storage element and the holder; the case has a case wall that faces the holder in a third direction orthogonal to the first direction and the second direction; The case wall has a movement restriction portion that restricts movement of the holder in the first direction by contacting the holder.

According to this, in the power storage device, the power storage element and the holder are housed in a case, the case has a case wall portion facing the holder in the third direction, and the case wall portion prevents movement of the holder in the first direction. It has a movement restriction part that restricts the movement. In this way, the movement restricting section provided on the case wall restricts the movement of the holder, thereby restricting the 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 case body has a bottom wall disposed facing in the second direction, and a side wall disposed facing in the third direction, and the movement restricting portion is provided on the side wall. Good too.

According to this, by providing the movement restriction part on the side wall of the case body, the movement restriction part that restricts the movement of the holder can be easily provided in the case. Thereby, a configuration that improves the vibration resistance or impact resistance of the power storage device can be easily realized.

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 on the case wall 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 portion may be the convex portion, and the holder may have the concave portion into which the convex portion fits.

When forming a recess in the case wall, it is necessary to increase the thickness of the case wall. For this reason, the movement restricting portion of the case wall is a convex portion, and the holder is formed with a concave portion into which the convex portion fits. As a result, the thickness of the case wall can be reduced, and the space of the power storage device can be saved. The holder can be fixed to the case wall by fitting the convex part of the case wall into the concave part of the holder, so the movement of the holder within the case is controlled not only in the first direction but also in the second and second directions. It can also be restricted in three directions. As a result, movement of the power storage element held by the holder can be further restricted, so that the vibration resistance or impact resistance of the power storage device can be further improved.

The power storage device may further include another holder that sandwiches the electricity storage element with the holder, and the other holder may be thinner in the first direction than the holder.

When a plurality of holders are arranged, there is no need to restrict movement of all the holders with respect to the case. Therefore, the holders other than the holder whose movement is restricted by the movement restriction part do not need to have a portion that comes into contact with the movement restriction part, and therefore can be made thinner. Thereby, the space of the power storage device can be saved.

The case further includes another power storage element housed in the case and lined up with the power storage element in the third direction, and the case wall portion is disposed between the power storage element and the other power storage element inside the case. It may also be a wall that is

According to this, the wall between the electricity storage element and the other electricity storage element arranged in the third direction is made into a case wall part having a movement restriction part. Thereby, the wall can be utilized to limit the movement of the holder, so there is no need to newly provide a case wall having a movement restriction part, and the movement restriction part can be easily arranged in the case. Therefore, it is possible to save space in the power storage device, and it is also possible to easily realize a configuration that improves the vibration resistance or impact resistance of the power storage device.

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 (particularly case body 310) 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 showing the configuration of holder 200b according to this embodiment. FIG. 4 shows an enlarged view of the holder 200b shown in FIG.

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 portion 220, and a convex portion 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 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 convex portion 230 is a portion that restricts movement of the holder 200b in the Y-axis direction (first direction) by contacting the case 300. A pair of protrusions 230 are provided on both sides of the holder 200b in the X-axis direction. The convex portion 230 in the positive X-axis direction is a flat plate-shaped protrusion that protrudes in the positive X-axis direction from the end of the holder main body 210 in the positive X-axis direction and extends in the Z-axis direction. The convex portion 230 in the negative X-axis direction is a flat plate-shaped protrusion that projects in the negative X-axis direction from the end of the holder main body 210 in the negative X-axis direction and extends in the Z-axis direction. Each convex portion 230 has a plane (flat surface) parallel to the XZ plane on both sides in the Y-axis direction, which faces the case 300 in a posture facing the Y-axis direction and contacts the case 300 in the Y-axis direction. There is. In FIG. 4, the convex portion 230 is formed with a plurality of concave portions aligned in the Z-axis direction, but the concave portions may not be formed, or instead of the convex portion 230, the convex portion 230 is formed in the Y-axis direction. A through hole may be formed and used for the purpose of passing cooling gas (air) or the like.

[1.3 Description of case body 310]
Next, the configuration of case body 310 included in case 300 will be described in detail. FIG. 5 is a perspective view and a top view showing the configuration of the case body 310 according to the present embodiment. Specifically, (a) of FIG. 5 is a perspective view showing the configuration of the case body 310, and (b) of FIG. 5 is a perspective view showing the structure of the case body 310 shown in (a) of FIG. FIG. 3 is a top view showing the configuration of the unit when viewed from the Z-axis plus direction. FIG. 6 is a top view and a sectional view showing the positional relationship between the case body 310 and the holders 200a and 200b according to the present embodiment. Specifically, FIG. 6A is a top view showing a state in which the power storage element 100 and the holders 200a and 200b are arranged in the case body 310. FIG. 6(b) is a cross-sectional view showing the configuration when the convex portion 230 of the holder 200b and the movement restriction portion 312a of the case body 310 shown in FIG. 6(a) are cut along a plane parallel to the XY plane. It is. Since the half of the case main body 310 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 description regarding FIG. This is performed for half of the X-axis plus direction.

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 case wall portion 312 has a movement restriction portion 312a that restricts movement of the holder 200b in the Y-axis direction (first direction) by contacting the holder 200b. In this embodiment, the movement restricting portion 312a is a recessed portion recessed in the X-axis direction, which is formed on the surface of the case wall portion 312 that faces the power storage unit 10. That is, in the case wall portion 312 in the X-axis positive direction, a movement restricting portion 312a, which is a recessed portion recessed in the X-axis positive direction, is formed on the surface in the X-axis negative direction. In the case wall portion 312 in the negative X-axis direction, a movement restricting portion 312a, which is a concave portion recessed in the negative direction of the X-axis, is formed on the surface in the positive X-axis direction. The movement restricting part 312a is a rectangular shaped part extending in the Z-axis direction from one end of the case wall part 312 in the Z-axis direction to the other end in the Y-axis direction of the case wall part 312. It is a recess (groove). The movement restricting portion 312a has a plane (flat surface) parallel to the XZ plane on both inner surfaces in the Y-axis direction, and the plane faces the convex portion 230 of the holder 200b in a posture facing the Y-axis direction. It contacts the convex portion 230 in the axial direction (see FIG. 6).

Similarly, the case wall portion 313 has a movement restriction portion 313a that restricts movement of the holder 200b in the Y-axis direction (first direction) by contacting the holder 200b. In this embodiment, the movement restricting portion 313a is a recessed portion recessed in the X-axis direction, which is formed on the surface of the case wall portion 313 that faces the power storage unit 10. In other words, the movement limiting portion 313a, which is a concave portion recessed in the X-axis negative direction, is formed on the surface of the case wall portion 313 in the X-axis positive direction, and the movement limiting portion 313a, which is a recessed portion recessed in the X-axis positive direction, is formed on the surface facing the X-axis negative direction. A certain movement restriction portion 313a is formed. The movement restricting part 313a is a rectangular shaped part extending in the Z-axis direction from one end of the case wall part 313 in the Z-axis direction to the other end in the Y-axis direction of the case wall part 313. It is a recess (groove). The movement restricting part 313a has a plane (flat surface) parallel to the XZ plane on the inner surface on both sides in the Y-axis direction, and the plane faces the convex part 230 of the holder 200b in a posture facing the Y-axis direction. It contacts the convex portion 230 in the axial direction (see FIG. 6).

In this way, the movement restricting parts 312a and 313a are provided on the side walls (case walls 312 and 313) located on the sides of the power storage unit 10 in the case body 310, and are in contact with the convex part 230 of the holder 200b in the Y-axis direction. By doing so, movement of the holder 200b in the Y-axis direction is restricted. Specifically, as shown in FIG. 6, a pair of convex portions 230 of the holder 200b are inserted into the movement restricting portions 312a and 313a. In this embodiment, the pair of protrusions 230 are press-fitted into the movement restricting parts 312a and 313a, and the movement restricting parts 312a and 313a and the pair of protrusions 230 fit into each other.

When the convex part 230 is inserted (fitted) into the movement restricting part 312a or 313a, the surfaces of the movement restricting part 312a or 313a and the convex part 230 that face each other in the Y-axis direction contact each other, so that the holder 200b is Movement in the Y-axis direction (first direction) is restricted. In this embodiment, the movement limiting portions 312a or 313a are in contact with the convex portions 230 on both sides in the Y-axis direction, and limit movement of the holder 200b on both sides in the Y-axis direction. The movement restricting part 312a or 313a does not need to be in contact with the convex part 230 in the Y-axis direction, and only needs to be arranged near the convex part 230 in the Y-axis direction (with a small gap between it and the convex part 230). ). With this, the movement restricting section 312a or 313a can restrict the movement of the holder 200b in the Y-axis direction if the holder 200b moves a little in the Y-axis direction and comes into contact with the protrusion 230 (in a state of contact). . In this way, the movement restricting part 312a or 313a may have any configuration as long as it restricts the movement of the holder 200b (positions it) when it comes into contact with the convex part 230. It can also be said that the movement limiting section 312a or 313a is a positioning section that positions the holder 200b in the Y-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 Figures 2, 6, etc.). That is, the holder 200b has the convex portion 230, but the holder 200a does not have the convex portion 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. As a result, the distance between the two power storage elements 100 sandwiching the holder 200a is smaller than the distance between the two power storage elements 100 sandwiching the holder 200b (see FIG. 6).

Further, the holder 200b has the convex portion 230 inserted into the case wall 312 or 313 and is arranged to overlap with the case wall 312 or 313 in the X-axis direction, whereas the holder 200a has 312 or 313. That is, the holder 200a does not come into contact with the case walls 312 and 313, and a gap is formed between the case walls 312 and 313. Similarly, the holder 200c is spaced apart from the case wall 312 or 313 in the X-axis direction.

The power storage unit 10 having the holder 200b and the like configured as described above is housed in the case 300 in the following manner, and the power storage device 1 is manufactured. First, the power storage unit 10 is configured by stacking a plurality of power storage elements 100 and a plurality of spacers 200 (holders 200a, 200b, and 200c) with the holder 200b as a reference. Next, power storage unit 10 is compressed in the Y-axis direction using a jig with holder 200b as a reference. Here, in the power storage element 100, the long side surface 111 may swell toward the Y-axis direction depending on the amount and composition of the electrode body and electrolyte contained therein. The spacer 200 is made of resin, and has a compressible shape such as a corrugated iron shape in the holder 200a, or a rib formed on the holder main body 210 facing the Y-axis direction of the other holder 200c, which can be elastically deformed. may be possible. At this time, the bulges of the plurality of power storage elements 100 or the elastically deformable portions of the spacers 200 are compressed. Next, while maintaining the compressed state of the power storage unit 10, the convex part 230 of the holder 200b and the movement restricting parts 312a, 313a of the case walls 312, 313 of the case body 310 are aligned, and the power storage unit 10 is moved into the case body 310. Insert into. After inserting the power storage unit 10 into the case body 310, the compressed state of the power storage unit 10 is released and the jig is removed. As a result, the compressed bulges of the plurality of power storage elements 100 or the elastically deformable portion of the spacer 200 return, and the power storage unit 10 extends in the Y-axis direction and is housed in the case body 310. Before or after the power storage unit 10 is inserted into the case body 310, a bus bar, a bus bar frame, etc. are arranged with respect to the plurality of power storage elements 100. Then, the case body 310 and the lid body 320 are joined, the power storage unit 10 is housed in the case 300, and the power storage device 1 is manufactured.

[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, and the case 300 is a case that faces the holder 200b in the third direction (X-axis direction). It has wall portions 312 and 313. The case wall portions 312 and 313 have movement restriction portions 312a and 313a that restrict movement of the holder 200b in the first direction (Y-axis direction). In this way, movement of the holder 200b within the case 300 can be restricted by the movement restricting parts 312a and 313a provided on the case walls 312 and 313 restricting the movement of the holder 200b. 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 312a and 313a, 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.

By providing the movement restriction parts 312a, 313a on the side walls (case walls 312, 313) of the case body 310, the movement restriction parts 312a, 313a that restrict the movement of the holder 200b can be easily provided in the case 300. Thereby, a configuration that improves the vibration resistance or impact resistance of power storage device 1 can be easily realized.

The movement restricting parts 312a and 313a provided on the case walls 312 and 313 are made into recesses into which the convex part 230 of the holder 200b is inserted. As a result, by inserting the convex portion 230 into the recesses serving as the movement limiting portions 312a, 313a, the movement limiting portions 312a, 313a can be placed in a position 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.

The holder 200b can be fixed to the case walls 312, 313 by press-fitting (fitting) the protrusion 230 of the holder 200b into the movement restricting parts 312a, 313a of the case walls 312, 313. Therefore, movement of the holder 200b within the case 300 can be restricted not only in the first direction (Y-axis direction) but also in the second direction (Z-axis direction) and third direction (X-axis direction). Thereby, movement of power storage element 100 held in holder 200b can be restricted, so that vibration resistance or impact resistance of power storage device 1 can be improved.

When a plurality of holders 200a, 200b, and 200c are arranged, there is no need to restrict movement of all the holders 200a, 200b, and 200c with respect to case 300. Therefore, the holders 200a other than the holder 200b whose movement is restricted by the movement restriction parts 312a and 313a do not need to have a portion (convex part 230) that comes into contact with the movement restriction parts 312a and 313a, so the thickness is reduced. can be made thinner. Thereby, the space of power storage device 1 can be saved. Similarly, the holder 200c may be formed thinner than the holder 200b.

A wall (case wall part 313) between power storage element 100 and other power storage element 100 arranged in the third direction (X-axis direction) is a case wall part having movement restriction part 313a. As a result, the wall (case wall portion 313) can be used to restrict the movement of the holder 200b, so there is no need to newly provide a case wall portion having the movement restriction portion 313a, and the movement restriction portion 313a can be used to restrict the movement of the holder 200b. It can be easily placed in the Therefore, it is possible to save space in power storage device 1, and it is also possible to easily realize a configuration that improves vibration resistance or impact resistance of power storage device 1.

[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 312a and 313a of the case 300 are recessed parts into which the convex part 230 of the holder 200b is inserted, but the present invention is not limited to this. The movement restricting portion 312a or 313a may be a convex portion inserted into a concave portion or a through hole formed on the holder 200b, or a concave portion or a through hole into which the convex portion formed on the holder 200b is inserted. Modifications 1 to 3 will be specifically explained below.

(Modification 1)
FIG. 7 is a cross-sectional view showing the configuration of a case body 310A and a holder 201 according to Modification 1 of the present embodiment. FIG. 7 is a diagram corresponding to FIG. 6(b). Although FIG. 7 shows a portion corresponding to the movement restriction portion 312a in the above embodiment, the same applies to a portion corresponding to the movement restriction portion 313a.

As shown in FIG. 7, the case main body 310A in this modification includes a movement restricting part 312b instead of the movement restricting part 312a of the case main body 310 in the above embodiment. The holder 201 in this modification has a protrusion 231 instead of the protrusion 230 of the holder 200b 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 312b is a through hole that penetrates the case wall portion 312A in the X-axis direction. The convex portion 231 is a protruding portion that protrudes from the holder main body 210 in the X-axis plus direction, and passes through a through hole serving as the movement restricting portion 312b. The convex portion 231 has a male screw formed at the end in the positive direction of the X-axis, and is coupled to the nut 231a. The convex portion 231 may not include the nut 231a, but may simply pass through a through hole serving as the movement restricting portion 312b. The lengths of the movement limiting portion 312b and the convex portion 231 in the Z-axis direction are not particularly limited.

(Modification 2)
FIG. 8 is a cross-sectional view showing the configuration of a case body 310B and a holder 202 according to a second modification of the present embodiment. FIG. 8 is a diagram corresponding to FIG. 6(b). Although FIG. 8 shows a portion corresponding to the movement restriction portion 312a in the above embodiment, the same applies to a portion corresponding to the movement restriction portion 313a.

As shown in FIG. 8, the case main body 310B in this modification has a movement restricting part 312c instead of the movement restricting part 312a of the case main body 310 in the above embodiment. The holder 202 in this modification has a recess 232 instead of the projection 230 of the holder 200b 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 312c is a convex portion that protrudes from the case wall portion 312B in the negative X-axis direction. The recess 232 is a recess in which the end of the holder main body 210 in the X-axis plus direction is recessed in the X-axis minus direction, into which a convex portion serving as the movement restricting portion 312c is inserted. In this modification, the movement restricting part 312c is press-fitted into the recess 232, and the recess 232 and the movement restricting part 312c fit into each other. The lengths of the movement limiting portion 312c and the recessed portion 232 in the Z-axis direction are not particularly limited.

(Modification 3)
FIG. 9 is a cross-sectional view showing the configuration of a case body 310C and a holder 203 according to modification 3 of the present embodiment. FIG. 9 is a diagram corresponding to FIG. 6(b). Although FIG. 9 shows a portion corresponding to the movement restricting portion 312a in the above embodiment, the same applies to a portion corresponding to the movement restricting portion 313a.

As shown in FIG. 9, the case main body 310C in this modification includes a movement limiting section 312d instead of the movement limiting section 312a of the case main body 310 in the above embodiment. The holder 203 in this modification has a recess 233 instead of the projection 230 of the holder 200b 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 312d is a convex portion that protrudes from the case wall portion 312C in the negative X-axis direction while passing through a through hole 312e formed in the case wall portion 312C, and a male thread is formed at the end in the negative X-axis direction. has been done. The recess 233 is a recess in which the end of the holder main body 210 in the X-axis positive direction is recessed in the X-axis negative direction, and has a female screw formed therein, and the male screw of the movement restriction portion 312d is coupled thereto.

As described above, the power storage device 1 according to this modification can achieve the same effects as the above embodiment. In particular, in the first modification, the movement restricting portion 312b provided on the case wall portion 312A is a through hole into which the convex portion 231 of the holder 201 is inserted. Thereby, by inserting the convex portion 231 into the through hole serving as the movement restriction portion 312b, the movement restriction portion 312b can be placed at a position where it contacts the holder 201. In Modifications 2 and 3, the movement restricting parts 312c and 312d provided on the case walls 312B and 312C are convex parts inserted into the recesses 232 and 233 of the holders 202 and 203. Thereby, by inserting the convex portions serving as the movement restricting portions 312c and 312d into the recesses 232 and 233, the movement restricting portions 312c and 312d can be placed at positions where they come into contact with the holders 202 and 203. Therefore, movement of the holders 202 and 203 within the case 300 can be restricted with a simple configuration. Therefore, with a simple configuration, movement of power storage elements 100 held in holders 202 and 203 can be restricted, so a configuration that improves the vibration resistance or impact resistance of power storage device 1 can be easily realized. In Modifications 2 and 3, the recesses 232 and 233 may be formed as through holes.

When forming the recessed portions (movement restricting portions 312a, 313a) in the case walls 312, 313 as in the above embodiment, it is necessary to increase the thickness of the case walls 312, 313. On the other hand, in the first modification, a through hole is formed in the case wall 312A, and in the second modification, the movement restricting part 312c of the case wall 312B is a convex part, and the convex part fits into the holder 202. A recess 232 is formed. Thereby, the thickness of the case wall portions 312A and 312B can be reduced, so that the space of the power storage device 1 can be saved. Since the holder 202 can be fixed to the case wall 312B by fitting the convex part of the case wall 312B into the recess 232 of the holder 202, the movement of the holder 202 within the case 300 is controlled in the first direction (Y It can be restricted not only in the second direction (Z-axis direction) and third direction (X-axis direction). Thereby, the movement of power storage element 100 held in holder 202 can be further restricted, so that the vibration resistance or impact resistance of power storage device 1 can be further improved. In the first modification, the same thing as in the second modification can be said when fixing the holder 201 to the case wall 312A. The same can be said about Modification 3 as well as Modification 2.

In the above modification, the movement restricting portion of the case 300 and the holder may have any shape as long as they can limit the movement of the holder in the Y-axis direction with respect to the case 300 by coming into contact with each other, and may have various shapes other than those described above. can be taken. The movement restricting portion may be a convex portion that contacts a convex portion of the holder, may be two convex portions that sandwich the holder in the Y-axis direction, or may be a stepped portion that contacts the holder. With these, the same effects as in the above embodiment can be achieved.

(Other variations)
In the above embodiment, the movement restricting portion 312a or 313a of the case 300 is formed on the case wall portion 312 or 313 of the case body 310, but it may not be formed on the side wall (case wall portion) of the case 300. Bye. That is, the movement restricting portion 312a or 313a may be formed on a side wall (case wall portion) provided on the lid body 320. A plurality of movement restriction parts 312a (or a plurality of movement restriction parts 313a) may be formed on the case wall of the case 300 for one holder 200b to restrict movement of 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. When only one power storage unit 10 is housed inside case 300, case 300 does not have case wall portion 313, but has a pair of case wall portions 312 on which movement restriction portions 312a are formed. A plurality of power storage units 10 arranged in the Y-axis direction may be housed inside the case 300. When a plurality of power storage units 10 are housed in the case 300, a movement restriction section 312a or the like may be arranged corresponding to each of the plurality of power storage units 10, The movement restriction section 312a and the like may not be provided.

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 embodiments and modified examples, the surfaces of the movement limiting portions 312a, 312b, etc., the convex portions 230, 231, and the concave portions 232, 233 facing the Y-axis direction are flat surfaces parallel to the XZ plane orthogonal to the Y-axis direction. Although described as a flat surface, this is not required. The movement restricting parts 312a, 312b, etc., the convex parts 230, 231, and the concave parts 232, 233 may be flat surfaces inclined from a direction perpendicular to the Y-axis direction. Further, the movement limiting portions 312a, 312b, etc., the convex portions 230, 231, and the concave portions 232, 233 may have a waveform, unevenness, zigzag, or the like when viewed from the Z-axis direction.

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 312a 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 case 300 includes the case body 310 and the lid 320, but the case 300 does not need to have the lid 320.

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 storage device 100 storage unit 100 storage unit 110 Container 111 long side 112 short side 112 short side 113 bottom 140 electrode terminal 200 spacer 200 A, 200B, 201, 202, 203 Holder 210 Holder Body 221, 222 Daijibura Parts 223, 224 Second holder wall 230, 231 Projection 231a Nut 232, 233 Recess 300 Case 310, 310A, 310B, 310C Case body 310a Opening 311 Bottom wall 312, 312A, 312B, 312C, 313, 314 Case wall 312a, 312b, 312c, 312d, 313a Movement restriction portion 312e Through hole 320 Lid body

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;
comprising a case body having an opening formed in a second direction perpendicular to the first direction, and accommodating the electricity storage element and the holder;
The case has a case wall facing the holder in a third direction orthogonal to the first direction and the second direction,
The case wall portion includes a movement restriction portion that restricts movement of the holder in the first direction by contacting the holder. The power storage device. The case body has a bottom wall arranged in an orientation facing the second direction, and a side wall arranged in an orientation facing the third direction,
The power storage device according to claim 1, wherein the movement restriction section is provided on the side wall. The movement restriction 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. power storage device. The movement restricting portion is the convex portion,
The power storage device according to claim 3, wherein the holder has the recess into which the projection fits. further comprising another holder that sandwiches the electricity storage element with the holder,
The power storage device according to claim 1, wherein the other holder is thinner in the first direction than the holder. further comprising another power storage element housed in the case and aligned with the power storage element in the third direction,
The power storage device according to any one of claims 1 to 5, wherein the case wall portion is a wall arranged between the power storage element and the other power storage element inside the case.

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