JP7415397B2 - Energy storage element - Google Patents

Description

The present invention relates to a power storage element including an electrode body, a spacer, and a container.

BACKGROUND ART Conventionally, a power storage element is known that includes an electrode body, a spacer arranged along a curved surface of the electrode body, and a container that accommodates the electrode body and the spacer. For example, Patent Document 1 describes an electrode group (electrode body), a case (container) for accommodating the electrode group, and a spacer located in the case surrounding the curved part of the electrode group (curved surface of the electrode body). A secondary battery (power storage element) including the following is disclosed.

Japanese Patent Application Publication No. 2006-40899

In the conventional power storage element disclosed in Patent Document 1, the spacer is formed of an insulator made of an insulating material such as plastic (see paragraph [0049] of the specification of Patent Document 1, etc.), and the spacer is It is placed along the curved surface of the body. Therefore, when the electrode body expands, the curved surface of the electrode body presses the spacer, deforming the spacer, and further deforming the container, causing local stress to act on the electrode body and causing the electrode plate of the electrode body to deform. There is a risk of damage to the electrode body, such as breakage.

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 element that can suppress damage to an electrode body.

In order to achieve the above object, a power storage element according to one aspect of the present invention includes an electrode body, a spacer, and a metal container housing the electrode body and the spacer, the power storage element comprising: The electrode body has a curved surface that is curved so as to protrude in a second direction toward the spacer when viewed from the first direction, and the spacer is arranged between the container and the curved surface in the first direction. It has a first spacer part made of metal and arranged along the curved surface when viewed from the direction.

According to this, in the electricity storage element, the electrode body has a curved surface that is curved so as to protrude in the second direction, and the spacer is provided between the metal container and the curved surface of the electrode body in the first direction. It has a first spacer part made of metal and arranged along a curved surface when viewed from above. In this way, the spacer is provided with a metal first spacer portion that extends along the curved surface of the electrode body. As a result, even if the electrode body expands, the spacer is less likely to deform, so the container is also less likely to be deformed, and damage to the electrode body can be suppressed.

Moreover, the length of the electrode body in the second direction may be longer than the length in the first direction.

According to this, the length of the electrode body in the second direction, which is the protruding direction of the curved surface, is longer than the length in the first direction, which is the extending direction of the curved surface. Here, in the electrode body, if the length in the second direction is longer than the length in the first direction, when the electrode body expands, the force with which the curved surface presses the spacer is large, and the spacer is likely to deform. Therefore, in a power storage element including such an electrode body, it is highly effective to provide the first spacer portion in the spacer to make the spacer difficult to deform.

Further, the spacer may further include a second spacer part made of metal and disposed along the container between the container and the first spacer part.

According to this, the second metal spacer portion along the container is also provided on the container side of the spacer. As a result, the spacer becomes even more difficult to deform, the container becomes even more difficult to deform, and damage to the electrode body can be further suppressed.

Further, the second spacer portion may be joined to the container.

According to this, the spacer and the container can be mutually reinforced by joining the second spacer part of the spacer to the container. This makes it even more difficult for the spacer and the container to deform, so that damage to the electrode body can be further suppressed.

Further, a space is formed between the first spacer part and the second spacer part, and the second spacer part is joined to the container at a position facing the space. Good too.

According to this, the second spacer part is joined to the container at a position facing the space formed between the first spacer part and the second spacer part of the spacer. This prevents, for example, the electrode body from being pressed and dented during the joining work between the second spacer portion and the container, and the heat generated during joining by welding etc. from affecting the electrode body. Therefore, damage to the electrode body can be suppressed.

Further, the first spacer portion may be formed integrally with the container.

According to this, since the first spacer portion of the spacer is formed integrally with the container, the spacer and the container can be mutually reinforced. This makes it even more difficult for the spacer and the container to deform, so that damage to the electrode body can be further suppressed.

Further, the container may include a container body and a lid, and the first spacer portion may be disposed on the lid side of the container body.

According to this, since the first spacer portion of the spacer is disposed on the lid side of the container body, deformation of the lid side of the container body can be suppressed. Thereby, even if the electrode body expands, it is possible to suppress deformation of the joint between the container body and the lid in the container and damage to the joint.

Note that the present invention can be realized not only as such a power storage element, but also as a spacer or a spacer and a container.

According to the electricity storage element according to the present invention, damage to the electrode body can be suppressed.

FIG. 1 is a perspective view showing the appearance of a power storage element according to an embodiment. FIG. 2 is an exploded perspective view showing each component of the power storage element according to the embodiment. FIG. 2 is a perspective view showing the configuration of an electrode body according to an embodiment. FIG. 1 is a perspective view and a cross-sectional view showing the configuration of a spacer according to an embodiment. FIG. 2 is a side view and a cross-sectional view showing a configuration in which a spacer according to an embodiment is arranged in a container. FIG. 2 is a cross-sectional view showing a configuration in which a spacer according to an embodiment is arranged in a container. It is a perspective view and a cross-sectional view showing the structure of a spacer concerning modification 1 of an embodiment. It is a perspective view and a sectional view showing the composition of a spacer concerning modification 2 of an embodiment. It is a perspective view which shows the structure in the state in which the spacer based on the modification 3 of embodiment is arrange|positioned in a container main body. It is a perspective view and a top view showing the structure of a spacer and a container main body concerning modification 4 of an embodiment. FIG. 7 is a front view and a cross-sectional view showing the configuration of a power storage element including a spacer according to modification 5 of the embodiment.

Hereinafter, a power storage element according to an embodiment of the present invention (including variations thereof) will be described with reference to the drawings. Note that 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. Further, in each figure, dimensions etc. are not strictly illustrated. Furthermore, in each figure, the same or similar components are designated by the same reference numerals.

In addition, in the following explanation and drawings, the X axis is the direction in which a pair of electrode terminals (positive and negative electrode sides) of a power storage element are arranged, the direction in which a pair of current collectors are arranged, or the direction in which the short sides of the container face each other. Define direction. The direction in which the long sides of the container face each other or the thickness direction of the container is defined as the Y-axis direction. The direction in which the electrode terminals and the electrode body are arranged, the direction in which the container body and the lid of the power storage element are arranged, 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). Note that depending on the mode of use, 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. Furthermore, in the following description, for example, the X-axis plus direction indicates the arrow direction of the X-axis, and the X-axis minus direction indicates the opposite direction to the X-axis plus direction. The same applies to the Y-axis direction and the Z-axis direction.

In the following embodiments and modifications 1 to 4, the Z-axis direction is also referred to as the first direction and the X-axis direction is also referred to as the second direction, and in modification 5, the X-axis direction is also referred to as the first direction and the Z-axis direction is referred to as the It may also be called the second direction. In other words, the direction of the winding axis of the electrode body, the extending direction of the curved surface of the electrode body, or the extending direction of the spacer is also called the first direction, and the direction in which the curved surface of the electrode body protrudes and the alignment of the electrode body and the spacer are The direction or the direction in which the two spacers are arranged (opposing direction) may also be referred to as the second direction. Furthermore, 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 orthogonal, it does not only mean that the two directions are completely orthogonal, but also that they are substantially orthogonal, that is, there is a difference of only a few percent, for example. It also means to include.

(Embodiment)
[1 General description of power storage element 10]
First, a general description of the power storage element 10 in this embodiment will be given. FIG. 1 is a perspective view showing the appearance of a power storage element 10 according to the present embodiment. FIG. 2 is an exploded perspective view showing each component of the power storage element 10 according to the present embodiment.

The power storage element 10 is a secondary battery (single battery) that can charge and discharge electricity, and specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The power storage element 10 is used, for example, for power storage, power supply, or the like. Specifically, the power storage element 10 is used for driving or starting an engine of a moving 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. It is used as a battery etc. Examples of the above-mentioned vehicle include an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), and a gasoline vehicle. Examples of the above-mentioned railway vehicles for electric railways include electric trains, monorails, and linear motor cars. Furthermore, the power storage element 10 can also be used as a stationary battery or the like used for household use or as a generator.

Note that the power storage element 10 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. Furthermore, the power storage element 10 may be a primary battery that can use the stored electricity without being charged by the user, instead of being a secondary battery. Further, in the present embodiment, the power storage element 10 is illustrated as having a rectangular parallelepiped shape (prismatic shape), but the shape of the power storage element 10 is not limited to the rectangular parallelepiped shape, and may include a polygonal prism shape other than the rectangular parallelepiped shape, a cylindrical shape, It may also have a long cylindrical shape or the like.

As shown in FIG. 1, the power storage element 10 includes a container 100, a pair of electrode terminals 200 (on the positive electrode side and a negative electrode side), and a pair of upper gaskets 300 (on the positive electrode side and the negative electrode side). Further, as shown in FIG. 2, inside the container 100, there are a pair of lower gaskets 400 (on the positive electrode side and the negative electrode side), a pair of current collectors 500 (on the positive electrode side and the negative electrode side), and an electrode body 700. , a pair (positive electrode side and negative electrode side) of spacers 800 are accommodated. Further, an electrolytic solution (non-aqueous electrolyte) is sealed inside the container 100, but illustration thereof is omitted. The type of electrolytic solution is not particularly limited as long as it does not impair the performance of the power storage element 10, and various types can be selected. Further, in addition to the above-mentioned components, an insulating film or the like may be arranged to wrap around the electrode body 700 and the like.

The container 100 is a rectangular parallelepiped (box-shaped) metal case that includes a container body 110 with an opening formed therein and a lid 120 that closes the opening of the container body 110. With such a configuration, the container 100 is configured such that after the electrode body 700 and the like are housed inside the container body 110, the container body 110 and the lid body 120 are joined by welding or the like to form the joint part 140. is sealed. That is, on the side surfaces of the container 100 (the surfaces on both sides in the X-axis direction and both sides in the Y-axis direction), joint portions 140 are formed where the container body 110 and the lid body 120 are joined. The container body 110 and the lid 120 may be made of any metal, but are preferably made of a weldable metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate. is preferable.

The container main body 110 is a rectangular cylindrical member having a bottom and forming the main body of the container 100, and has an opening formed in the positive direction of the Z-axis. In other words, the container body 110 has a pair of short side walls 111 and 112 on both sides in the X-axis direction, a pair of long side walls 113 and 114 on both sides in the Y-axis direction, and a pair of long side walls 113 and 114 on both sides in the Y-axis direction. It has a bottom wall portion 115 at the bottom. The short side walls 111 and 112 are rectangular and flat walls that form the short sides of the container 100, and the long side walls 113 and 114 are rectangular and flat walls that form the long sides of the container 100. The bottom wall portion 115 is a rectangular and flat wall portion that forms the bottom surface of the container 100.

The lid 120 is a rectangular plate-like member that constitutes the lid of the container 100, and is disposed on the Z-axis plus direction side of the container body 110 so as to extend in the X-axis direction. In addition, a liquid injection port 121, which is a circular through hole for injecting the electrolytic solution into the interior of the container 100, is formed in the lid body 120. A liquid injection stopper 130 that closes 121 is arranged. Further, a gas exhaust valve 122 is disposed on the lid 120 to discharge gas inside the container 100 when the internal pressure of the container 100 increases.

The electrode body 700 is a power storage element (power generation element) that includes a positive electrode plate, a negative electrode plate, and a separator and can store electricity. Specifically, the electrode body 700 is formed by winding layers arranged in such a manner that a separator is sandwiched between a positive electrode plate and a negative electrode plate. As a result, a plurality of tabs of the positive electrode plate are stacked to form a positive electrode side tab portion 720, and a plurality of tabs of the negative electrode plate are stacked to form a negative electrode side tab portion 730. That is, the electrode body 700 includes an electrode body main body 710 and tab parts 720 and 730 that protrude from a part of the electrode body main body 710 in the Z-axis positive direction and extend in the Y-axis positive direction. Note that in this embodiment, the cross-sectional shape of the electrode body 700 is shown as an oval shape, but it may also be an elliptical shape or the like. A detailed explanation of the configuration of this electrode body 700 will be described later.

The electrode terminal 200 is an electrode terminal electrically connected to the electrode body 700 via the current collector 500. The electrode terminal 200 is connected to the current collector 500 and attached to the lid 120 by caulking or the like. Specifically, the electrode terminal 200 has a shaft portion 201 (rivet portion) extending downward (in the negative Z-axis direction). Then, the shaft portion 201 is inserted into the through hole 301 of the upper gasket 300, the through hole 123 of the lid 120, the through hole 401 of the lower gasket 400, and the through hole 501 of the current collector 500, and is caulked. . Thereby, the electrode terminal 200 is fixed to the lid 120 together with the upper gasket 300, the lower gasket 400, and the current collector 500. Note that the electrode terminal 200 is formed of a conductive member such as metal such as aluminum, aluminum alloy, copper, or copper alloy.

The current collector 500 is a rectangular and flat member that electrically connects the electrode body 700 and the electrode terminal 200. Specifically, the current collector 500 on the positive electrode side is connected (joined) to the tab portion 720 on the positive electrode side of the electrode body 700 by welding or the like, and as described above, is connected to the electrode terminal 200 on the positive electrode side by caulking or the like. Joined. The same applies to the negative electrode side. The current collector 500 is made of a conductive member such as metal such as aluminum, aluminum alloy, copper, or copper alloy. Note that the method of connecting (joining) the current collector 500 and the electrode terminal 200 is not limited to caulking, but may include welding such as ultrasonic welding, laser welding, resistance welding, or a method other than caulking such as screw fastening. Mechanical bonding or the like may also be used. Further, as a method for connecting (joining) the current collector 500 and the tab parts 720 and 730, any welding method such as ultrasonic welding, laser welding, resistance welding, etc. may be used, and caulking joining or screw fastening may be used. Mechanical bonding, etc., may also be used.

The spacer 800 is a columnar metal column extending in the Z-axis direction between both side surfaces of the electrode body 700 in the X-axis direction and the inner surface of the container 100 and restricts the position of the electrode body 700 in the container 100. This is a manufactured side spacer. The spacer 800 may be made of any metal, but may be made of the same metal material as the container 100 (container body 110), such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate. It is preferable that the The spacer 800 can be manufactured by various methods such as press working, forging, casting (die casting, etc.), extrusion molding, and the like. A detailed explanation of the configuration of this spacer 800 will be given later.

The upper gasket 300 is a flat insulating sealing member disposed between the lid 120 of the container 100 and the electrode terminal 200. The lower gasket 400 is a flat insulating sealing member disposed between the lid 120 and the current collector 500. The upper gasket 300 and the lower gasket 400 are made of, for example, polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate (PET). ), polybutylene terephthalate (PBT), polyether ether ketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyether sulfone (PES), ABS resin, or It is formed from a resin or the like having electrical insulation properties such as a composite material thereof.

[2 Description of configuration of electrode body 700]
Next, the configuration of the electrode body 700 will be described in detail. FIG. 3 is a perspective view showing the configuration of an electrode body 700 according to this embodiment. Specifically, FIG. 3(a) shows the structure of the electrode body 700 shown in FIG. 2 in a partially unfolded state, and FIG. 3(b) shows the structure of the electrode body 700 after winding. The body 700 is shown enlarged.

As shown in FIG. 3A, the electrode body 700 is formed by alternately stacking and winding a positive electrode plate 740, a negative electrode plate 750, and separators 760a and 760b. That is, the electrode body 700 is formed by stacking a positive electrode plate 740, a separator 760a, a negative electrode plate 750, and a separator 760b in this order and winding them.

The positive electrode plate 740 is an electrode plate (electrode plate) in which a positive electrode active material layer is formed on the surface of a positive electrode base material layer, which is a long strip-shaped metal foil made of aluminum, aluminum alloy, or the like. The negative electrode plate 750 is an electrode plate (electrode plate) in which a negative electrode active material layer is formed on the surface of a negative electrode base material layer, which is a long strip-shaped metal foil made of copper, copper alloy, or the like. As the positive electrode active material used in the positive electrode active material layer and the negative electrode active material used in the negative electrode active material layer, any known material may be used as long as it is a positive electrode active material and negative electrode active material that can intercalate and deintercalate lithium ions. can be used. Separators 760a and 760b are microporous sheets made of resin. Note that any known material can be used as the material for the separators 760a and 760b as long as it does not impair the performance of the power storage element 10.

The positive electrode plate 740 has a plurality of rectangular tabs 741 that protrude outward at one end in the direction of the winding axis, and the negative electrode plate 750 similarly has a plurality of rectangular tabs 741 that protrude outward at one end in the direction of the winding axis. It has a shaped tab 751. These plurality of tabs 741 and plurality of tabs 751 are portions where the active material layer is not formed and the base material layer is exposed. Note that the shapes of the tabs 741 and 751 are not particularly limited. The winding axis is a virtual axis that becomes the central axis when winding the positive electrode plate 740, the negative electrode plate 750, etc., and in this embodiment, it is an axis parallel to the Z-axis direction that passes through the center of the electrode body 700. It is a straight line. Then, as shown in FIG. 3B, a plurality of tabs 741 are stacked to form a tab portion 720, and a plurality of tabs 751 are stacked to form a tab portion 730. Note that although the tab portions 720 and 730 are bent in the positive Y-axis direction after being joined to the current collector 500, they may be configured such that they are not bent even after being joined to the current collector 500.

The electrode body main body part 710 is a part that constitutes the main body of the electrode body 700, and specifically, it is a part of the electrode body 700 other than the tab parts 720 and 730. That is, the electrode main body portion 710 is an elongated cylindrical portion formed by winding the portions of the positive electrode plate 740 and the negative electrode plate 750 on which the active material layers are formed, and the separators 760a and 760b. As a result, the electrode main body portion 710 has a pair of electrode body curved surfaces 711 and 712 on both sides in the X-axis direction, and a pair of electrode body flat surfaces 713 and 714 on both sides in the Y-axis direction.

The electrode body curved surface 711 is a curved surface that is curved in a semicircular arc shape so as to protrude in the X-axis minus direction when viewed from the Z-axis direction, and extends in the Z-axis direction. The spacer 800 is arranged to face the short side wall portion 111 of the container body 110 of the container 100. The electrode body curved surface 712 is a curved surface that is curved in a semicircular arc shape so as to protrude in the X-axis positive direction when viewed from the Z-axis direction, and extends in the Z-axis direction. It is arranged opposite to the spacer 800 and the short side wall portion 112 of the container body 110. That is, the electrode body curved surfaces 711 and 712 are curved surfaces that are curved so as to protrude in the X-axis direction (second direction) toward the spacer 800 when viewed from the Z-axis direction (first direction). The electrode body flat surface 713 is a rectangular flat surface that extends parallel to the XZ plane facing the Y-axis plus direction, and is disposed opposite to the long side wall portion 113 of the container body 110. The electrode body flat surface 714 is a rectangular flat surface extending parallel to the XZ plane facing in the negative Y-axis direction, and is disposed opposite to the long side wall portion 114 of the container body 110.

Moreover, the electrode body 700 is formed so that the length in the X-axis direction (second direction) is longer than the length in the Z-axis direction (first direction). In other words, the distance (maximum distance) between the electrode body curved surfaces 711 and 712 is longer than the length of the electrode body curved surfaces 711 and 712 in the Z-axis direction. In this case, the length of the electrode body flat surfaces 713, 714 in the X-axis direction may be formed shorter than the length of the electrode body flat surfaces 713, 714 in the Z-axis direction; Preferably, it is long.

[3 Description of configuration of spacer 800]
Next, the configuration of spacer 800 will be described in detail. Note that in FIG. 2, the spacer 800 on the X-axis plus direction side and the spacer 800 on the X-axis minus direction side have the same configuration. Therefore, below, the configuration of the spacer 800 on the negative side of the X-axis will be described, and the description of the configuration of the spacer 800 on the positive side of the X-axis will be omitted.

FIG. 4 is a perspective view and a cross-sectional view showing the configuration of a spacer 800 according to this embodiment. Specifically, (a) in FIG. 4 is an enlarged perspective view showing the spacer 800 on the negative side of the X-axis shown in FIG. 2, and (b) in FIG. ) is a cross-sectional view showing the configuration of the spacer 800 taken along the IVb-IVb cross section. 5 and 6 are a side view and a sectional view showing a configuration in which a spacer 800 according to the present embodiment is arranged in a container 100. Specifically, FIG. 5(a) is a side view showing the configuration of the spacer 800 and the electrode body 700 arranged in the container body 110 of the container 100 when viewed from the negative direction of the X-axis. . FIG. 5(b) is a cross-sectional view showing the structure shown in FIG. 5(a) taken along the line Vb-Vb. FIG. 6 is a sectional view showing the configuration shown in FIG. 5(a) taken along the VI-VI section.

As shown in FIG. 4(a), the spacer 800 has a spacer body portion 810 and a spacer end portion 820. The spacer main body portion 810 is a columnar portion extending in the Z-axis direction and has a shape in which the surface on the X-axis positive side is curved in the X-axis negative direction, and is a columnar portion extending in the Z-axis direction. placed in the direction. The spacer end 820 is a rectangular and plate-shaped wall located at the end of the spacer 800 on the Z-axis positive direction, and is arranged in the Z-axis positive direction at the end of the electrode body 700 on the X-axis negative direction. be done.

Specifically, as shown in FIGS. 5 and 6, the spacer body 810 is arranged in the negative X-axis direction of the electrode body 710 of the electrode body 700. That is, the spacer main body 810 is sandwiched between the short side wall 111 of the container main body 110 of the container 100 and the electrode body curved surface 711, and is arranged in contact with the short side wall 111 and the electrode body curved surface 711. . Note that in this embodiment, the spacer main body 810 is arranged so as to be in contact with the long side wall 113 and the long side wall 114; Good too.

Here, as shown in FIG. 4(b), the spacer main body portion 810 includes a first spacer portion 811 and second spacer portions 812, 813, and 814. The first spacer portion 811 is a side surface portion of the spacer body portion 810 on the X-axis positive direction side, and is curved in a semicircular arc shape so as to be concave in the X-axis negative direction when viewed from the Z-axis direction, and This is a curved section extending from the front. The second spacer portion 812 is a side surface portion of the spacer body portion 810 on the X-axis minus direction side, and is a flat portion extending parallel to the YZ plane and in the Z-axis direction. The second spacer portion 813 is a side surface portion of the spacer body portion 810 on the Y-axis plus direction side, and is a flat portion extending parallel to the XZ plane and in the Z-axis direction. The second spacer portion 814 is a side surface portion of the spacer body portion 810 on the Y-axis minus direction side, and is a flat portion extending parallel to the XZ plane and in the Z-axis direction.

Specifically, as shown in FIG. 6, the first spacer portion 811 is located between the short side wall portion 111 of the container body 110 of the container 100 and the electrode body curved surface 711 from the Z-axis direction (first direction). This is a metal portion disposed along the curved surface 711 of the electrode body. That is, the first spacer portion 811 is disposed to face the electrode body curved surface 711 and to be in contact with the electrode body curved surface 711. Specifically, the first spacer portion 811 continuously extends from the end of the electrode body curved surface 711 on the long side wall 113 side to the end on the long side wall 114 side. is placed in contact with.

Further, as shown in FIG. 5, the spacer body 810 extends in the Z-axis direction so as to cover the electrode body curved surface 711 from one end to the other end of the electrode body body 710 in the Z-axis direction. It is arranged as follows. In other words, the first spacer portion 811 shown in FIG. 4B and FIG. The electrode body is arranged along the curved surface 711 when viewed from the Z-axis direction. That is, the first spacer portion 811 is disposed in continuous contact with the electrode body curved surface 711 from one end of the portion facing the electrode body curved surface 711 to the other end in the Z-axis direction. In this embodiment, the first spacer part 811 is longer than the electrode body curved surface 711 in the Z-axis direction, so that a part of the first spacer part 811 from one end to the other end in the Z-axis direction and the electrode body The entire curved surface 711 from one end to the other end in the Z-axis direction is arranged in contact with each other.

Note that when the first spacer portion 811 has the same length as the electrode body curved surface 711 in the Z-axis direction, the entire length of the first spacer portion 811 from one end to the other end in the Z-axis direction is the same as the electrode body curved surface 711. It comes into contact with the entire surface 711 from one end to the other end in the Z-axis direction. Further, when the first spacer portion 811 is shorter than the electrode body curved surface 711 in the Z-axis direction, the entire first spacer portion 811 from one end to the other end in the Z-axis direction and the electrode body curved surface 711 A portion from one end to the other end in the Z-axis direction comes into contact with each other. In this case, the first spacer portion 811 preferably contacts half or more of the length of the electrode body curved surface 711 from one end to the other end in the Z-axis direction, more preferably two-thirds or more of the length, It is more preferable to contact 3/4 or more.

The second spacer parts 812 , 813 , and 814 are arranged between the short side wall part 111 , the long side wall part 113 , and the long side wall part 114 of the container body 110 of the container 100 and the first spacer part 811 . This is a metal part placed along the line. Specifically, the second spacer portion 812 is disposed opposite to the short side wall portion 111 and in contact with the short side wall portion 111 . In this embodiment, the second spacer portion 812 is disposed so that its entire surface is in contact with the short side wall portion 111 . That is, the second spacer portion 812 is disposed in continuous contact with the short side wall portion 111 from one end of the portion facing the short side wall portion 111 to the other end in the Y-axis direction. Further, the second spacer portion 812 is disposed in continuous contact with the short side wall portion 111 from one end of the portion facing the short side wall portion 111 to the other end in the Z-axis direction.

The second spacer portion 813 is disposed opposite to and in contact with the long side wall portion 113 of the container body 110. In this embodiment, the second spacer portion 813 is disposed so that its entire surface is in contact with the long side wall portion 113. That is, the second spacer portion 813 is disposed in continuous contact with the long side wall portion 113 from one end of the portion facing the long side wall portion 113 to the other end in the X-axis direction. Further, the second spacer portion 813 is disposed in continuous contact with the long side wall portion 113 from one end of the portion facing the long side wall portion 113 to the other end in the Z-axis direction.

The second spacer portion 814 is disposed opposite to and in contact with the long side wall portion 114 of the container body 110. In this embodiment, the second spacer portion 814 is disposed so that its entire surface is in contact with the long side wall portion 114. That is, the second spacer portion 814 is disposed in continuous contact with the long side wall portion 114 from one end of the portion facing the long side wall portion 114 to the other end in the X-axis direction. Further, the second spacer portion 814 is disposed in continuous contact with the long side wall portion 114 from one end of the portion facing the long side wall portion 114 to the other end in the Z-axis direction.

Here, as shown in FIGS. 5 and 6, the spacer 800 is joined to the container 100. In this embodiment, the spacer end portion 820 is joined to the short side wall portion 111 at both ends of the short side wall portion 111 of the container body 110 of the container 100 in the Y-axis direction on the Z-axis positive direction side, and the joint portion 910 is It is formed. Further, the second spacer portion 812 of the spacer body portion 810 is joined to the short side wall portion 111 at both ends of the short side wall portion 111 in the Y-axis direction on the Z-axis negative direction side, thereby forming a long joint extending in the Z-axis direction. A portion 920 is formed. The joints 910 and 920 are welds formed by penetration welding by laser welding, for example. Note that the method of forming the joint portions 910 and 920 is not particularly limited, and any joining method may be used, such as resistance welding, ultrasonic joining, caulking joining, screwing, etc.

Further, instead of or in addition to the joint part 910, a joint part 920 extends from the end of the short side wall part 111 on the Z-axis negative direction to the end on the Z-axis positive direction. may also be formed. Further, the second spacer portion 812 and the short side wall portion 111 may be joined at a location other than the above. Furthermore, instead of or in addition to the joining of the second spacer part 812 and the short side wall part 111, the second spacer part 813 and the long side wall part 113 may be joined, or the second spacer part 813 and the long side wall part 113 may be joined. 814 and the long side wall portion 114 may be joined. That is, any one of the second spacer parts 812, 813, and 814 may be joined to the container 100.

[4 Explanation of effects]
As described above, according to the power storage element 10 according to the embodiment of the present invention, the electrode body 700 has the electrode body curved surface 711 that is curved so as to protrude in the second direction (X-axis direction). . The spacer 800 is a first metal spacer disposed between the metal container 100 and the electrode body curved surface 711 along the electrode body curved surface 711 when viewed from the first direction (Z-axis direction). It has a section 811. In this way, the spacer 800 is provided with a first spacer portion 811 made of metal along the curved surface 711 of the electrode body. Thereby, even if the electrode body 700 expands, the spacer 800 becomes less likely to deform, so the container 100 also becomes less likely to deform, and damage to the electrode body 700 can be suppressed.

Further, the length of the electrode body 700 in the second direction, which is the protruding direction of the electrode body curved surface 711, is longer than the length in the first direction, which is the extending direction of the electrode body curved surface 711. Here, in the electrode body 700, if the length in the second direction is longer than the length in the first direction, when the electrode body 700 expands, the force with which the electrode body curved surface 711 presses the spacer 800 is large, and the spacer 800 is easily deformed. Therefore, in the power storage element 10 including such an electrode body 700, it is highly effective to provide the first spacer portion 811 in the spacer 800 to make the spacer 800 difficult to deform.

Further, since the first spacer portion 811 is arranged along the electrode body curved surface 711 from one end to the other end of the electrode body curved surface 711 in the first direction, the electrode body curved surface 711 touches the spacer 800. The pressing force can be dispersed. Thereby, even if the electrode body 700 expands, the spacer 800 becomes less likely to deform, so the container 100 also becomes less likely to deform, and damage to the electrode body 700 can be suppressed.

Furthermore, metal second spacer parts 812, 813, and 814 are provided on the container 100 side of the spacer 800 along the container 100. As a result, the spacer 800 becomes even more difficult to deform, so the container 100 also becomes even more difficult to deform, and damage to the electrode body 700 can be further suppressed.

Further, by joining any one of the second spacer parts 812, 813, and 814 of the spacer 800 to the container 100, the spacer 800 and the container 100 can be mutually reinforced. As a result, the spacer 800 and the container 100 become more difficult to deform, so that damage to the electrode body 700 can be further suppressed.

In addition, although the effect was mainly explained above on the positive electrode side (electrode body curved surface 711 side) of the electricity storage element 10, the effect on the negative electrode side (electrode body curved surface 712 side) is also explained. The same can be said.

[5 Description of modification]
(Modification 1)
Next, a first modification of the above embodiment will be described. FIG. 7 is a perspective view and a sectional view showing the configuration of a spacer 800a according to Modification 1 of the present embodiment. Specifically, although FIG. 7 is a diagram corresponding to FIG. 4, for convenience of explanation, the container body 110 of the container 100 is also shown in broken lines.

As shown in FIG. 7, a spacer 800a in this modification is the spacer 800 in the above embodiment in which a space 815 is formed. The other configurations are the same as those in the above embodiment, so detailed explanations will be omitted.

The space 815 passes through the spacer end 820a of the spacer 800a and the spacer main body 810a in the Z-axis direction. That is, the space 815 is a space formed between the first spacer part 811 and the second spacer parts 812, 813, and 814 of the spacer main body part 810a. Specifically, two spaces 815 are formed between the first spacer part 811 and the second spacer parts 812 and 813, and between the first spacer part 811 and the second spacer parts 812 and 814. There is. Such a spacer 800a can be produced by casting (die casting, etc.), extrusion molding, or the like.

With such a configuration, the second spacer portion 812 is joined to the container 100 at a position facing the space 815. In other words, the joint portion 920 faces the space 815 formed by joining the second spacer portion 812 and the short side wall portion 111 at both ends of the short side wall portion 111 in the Y-axis direction, and extends from the space 815. It becomes a long joint along the installation direction (Z-axis direction).

Note that instead of or in addition to the joint part 920, the second spacer part 813 and the long side wall part 113 may be joined at a position facing the space 815, or the second spacer part 814 and The long side wall portion 114 may be joined at a position facing the space 815. That is, any one of the second spacer parts 812, 813, and 814 may be joined to the container 100 at a position facing the space 815.

Further, in this modification, two spaces 815 are formed in the spacer 800a, but the number of spaces 815 is not limited, and may be one, three or more. The arrangement position, size, and shape of the space 815 are also not particularly limited.

As described above, the power storage element according to this modification can achieve the same effects as the above embodiment. In particular, in this modification, the second spacer parts 812, 813, and 814 are located at positions facing the spaces 815 formed between the first spacer part 811 and the second spacer parts 812, 813, and 814 of the spacer 800a. Any part of it is joined to the container 100. This prevents, for example, pressing and denting the electrode body 700 when joining the second spacer part and the container 100, or heat from welding or the like affecting the electrode body 700. Therefore, damage to the electrode body 700 can be suppressed. Furthermore, since the space 815 is formed between the first spacer part 811 and the second spacer parts 812, 813, and 814 of the spacer 800a, the electrolyte can be stored in the space 815, so that the electrolyte can be stored in the container. The amount of electrolyte within 100 ml can be secured.

(Modification 2)
Next, a second modification of the above embodiment will be described. FIG. 8 is a perspective view and a cross-sectional view showing the configuration of a spacer 800b according to a second modification of the present embodiment. Specifically, FIG. 8 is a diagram corresponding to FIG. 7.

As shown in FIG. 8, a spacer 800b in this modification is formed by bending a plate-like member, which is the same as the spacer 800a in modification 1. That is, the spacer 800b does not have the spacer end portion 820a in the first modification, but has a spacer body portion 810b formed by bending a plate-like member. The other configurations are the same as those in Modification Example 1, so detailed explanations will be omitted.

The spacer body portion 810b is formed by bending a flat metal member to form a first spacer portion 811 and second spacer portions 812, 813, and 814, and joining both ends by welding or the like. Note that the bonding positions at both ends are preferably spaced apart from the electrode body curved surface 711. Thereby, a space 816 larger than the space 815 in the first modification is formed in the spacer main body 810b.

As described above, the power storage element according to this modification can achieve the same effects as the above embodiment. In particular, in this modification, since the spacer 800b is formed by bending a plate-like member, the spacer 800b can be easily manufactured.

(Modification 3)
Next, a third modification of the above embodiment will be described. FIG. 9 is a perspective view showing a configuration in which a spacer 800 according to modification 3 of the present embodiment is arranged inside the container body 110a.

As shown in FIG. 9, a container body 110a in this modification has an opening formed in the short side wall portion 111 of the container body 110 in the above embodiment. That is, the container body 110a has an opening 111a formed in the short side wall 111, and is joined to the spacer 800 at the opening 111a. The other configurations are the same as those in the above embodiment, so detailed explanations will be omitted.

The container body 110a is constructed by welding a bottom wall portion 115, which is a flat plate-like member, to a rectangular cylindrical member consisting of short side wall portions 111 (short side wall portions 111b and 111c) and 112, and long side wall portions 113 and 114. It is formed by joining. The square tubular member is formed by bending a flat metal member to form a short side wall portion 111b, a long side wall portion 113, a short side wall portion 112, a long side wall portion 114, and a short side wall portion 111c. It is formed by joining the short side wall portion 111b and the short side wall portion 111c by welding or the like.

In addition, a rectangular notch is formed in the center of the short side wall portion 111b and the short side wall portion 111c in the Z-axis direction, and when the short side wall portion 111b and the short side wall portion 111c are joined, the opening portion 111a is formed. A joint portion 930 is formed by joining the short side wall portion 111 and the spacer 800 at the position of the opening 111a.

Note that instead of or in addition to the opening 111a, an opening is formed at the end of the long side wall 113 or 114 on the X-axis minus direction side, and the long side wall is closed at the position of the opening. The portion 113 or 114 and the spacer 800 may be joined. Furthermore, although the container body 110a is made up of two members with the bottom wall portion 115 as a separate member, it may be further divided at the short side wall portion 112, for example, and may be made up of three or more members. Good too. Alternatively, the container body 110a may have a configuration in which a through hole serving as the opening 111a is formed in a one-piece container body as in the above embodiment.

Similarly, for the X-axis positive direction side, an opening is formed in the short side wall 112 of the container body 110a, and the spacer 800 on the X-axis positive direction side is joined to the container body 110a at the position of the opening. You can also do this.

As described above, the power storage element according to this modification can achieve the same effects as the above embodiment. In particular, in this modification, since the container body 110a and the spacer 800 are joined at the position of the opening 111a formed in the container body 110a, the spacer 800 can be easily joined to the container body 110a.

(Modification 4)
Next, a fourth modification of the above embodiment will be described. FIG. 10 is a perspective view and a plan view showing the configuration of a spacer 800c and a container body 110b according to a fourth modification of the present embodiment. Specifically, FIG. 10(a) is a perspective view showing the configuration of the spacer 800c and the container body 110b, and FIG. 10(b) is a portion on the negative X-axis direction side of FIG. 10(a). FIG. 3 is a top view showing the configuration when viewed from the Z-axis plus direction.

As shown in FIG. 10, the spacer 800c in this modification is formed integrally with the container body 110b. That is, the spacer 800c has a first spacer part 811 having the same shape as the spacer 800b in the second modification, and the first spacer part 811 is formed integrally with the container body 110b. The other configurations are the same as those in the above embodiment, so detailed explanations will be omitted.

The first spacer part 811 is a plate-shaped curved part, and the center part in the Y-axis direction is connected to the short side wall part 111, the end part in the Y-axis positive direction is connected to the long side wall part 113, and the first spacer part 811 is connected in the Y-axis negative direction. The side ends are connected to the long side wall 114 . Thereby, two spaces 817 are formed between the first spacer part 811 and the short side wall part 111 and the long side wall parts 113 and 114. Furthermore, two recesses 818 that connect to these two spaces 817 are formed at the end of the first spacer portion 811 on the Z-axis plus direction side. The recessed portion 818 is a notch formed such that portions of the end of the first spacer portion 811 on the Z-axis positive direction side, on both sides of the Y-axis direction corresponding to the space 817, are recessed in the Z-axis negative direction.

Such an integrally molded product of the spacer 800c and the container body 110b can be produced by extrusion molding, casting (die casting, etc.), or the like. That is, a rectangular cylindrical member consisting of the short side walls 111 and 112, the long side walls 113 and 114, and the spacer 800c is formed by extrusion molding or the like, and the bottom wall part 115, which is a flat plate member, is joined by welding or the like. By doing so, the integrally molded product can be manufactured. Note that the spacer 800c and the container body 110b may be joined by welding or the like to be integrated.

As described above, the power storage element according to this modification can achieve the same effects as the above embodiment. In particular, in this modification, the first spacer portion 811 of the spacer 800c is formed integrally with the container 100, so that the spacer 800c and the container 100 can be mutually reinforced. This makes it even more difficult for the spacer 800c and the container 100 to deform, so that damage to the electrode body 700 can be further suppressed. Further, since it is not necessary to provide the spacer 800c with a portion facing the container 100 (the above-mentioned second spacer portions 812, 813, and 814), the volume inside the container 100 can be increased. Furthermore, since the number of parts can be reduced, manufacturing can be simplified and costs can be reduced.

Further, since the space 817 is formed between the first spacer part 811 and the short side wall part 111 and the long side wall parts 113 and 114 of the spacer 800c, the electrolyte can be stored in the space 817. , the amount of electrolyte in the container 100 can be secured. Furthermore, since the first spacer portion 811 has a recess 818 connected to the space 817, the electrolytic solution can be easily guided to the space 817.

Note that the spacers 800a and 800b of the first and second modifications may also have a recess similar to the recess 818 of this modification.

(Modification 5)
Next, a fifth modification of the above embodiment will be described. FIG. 11 is a front view and a sectional view showing the configuration of a power storage element 10a including spacers 800d and 800e according to modification 5 of the present embodiment. Specifically, (a) of FIG. 11 is a front view showing the configuration of the power storage element 10a when the long side wall portion 114 of the container body 110 is removed and viewed from the negative direction of the Y-axis. FIG. 11(b) is a cross-sectional view showing the configuration when the central portion of the power storage element 10a in the X-axis direction is cut along a plane parallel to the YZ plane.

As shown in FIG. 11, in this modification, the power storage element 10a includes an electrode body 700a having a winding axis parallel to the X-axis direction, and ends of the electrode body 700a on the X-axis negative direction side and the X-axis positive direction side. A current collector 500a connected to the sections 720a and 730a. A spacer 800d is arranged in the positive direction of the Z-axis of the main body part 710 of the electrode body 700a, and a spacer 800e is arranged in the negative direction of the Z-axis of the main part 710 of the electrode body 700a. The other configurations are the same as those in the above embodiment, so detailed explanations will be omitted.

The spacer 800d includes a first spacer portion 811 and second spacer portions 813 and 814. That is, in this modification, the spacer 800d does not have the second spacer portion 812 in the above embodiment. Such a spacer 800d can be produced by bending or pressing a flat metal member. Further, the electrode body 700a has an electrode body curved surface 711 that is curved so as to protrude in the Z-axis direction (second direction) toward the spacer 800d when viewed from the X-axis direction (first direction).

Specifically, the first spacer portion 811 is located between the lid 120 of the container 100 and the electrode body curved surface 711 of the electrode body 700a when viewed from the X-axis direction (first direction). This is a metal part placed along the line. That is, the first spacer portion 811 is arranged on the lid 120 side of the container body 110 (on the joint 140 side between the container body 110 and the lid 120), and spaced apart from the lid 120. In other words, the first spacer portion 811 is spaced apart from the gas exhaust valve 122 (or the liquid injection port 121 and the liquid injection plug 130) on the gas exhaust valve 122 side (or the liquid injection port 121 and liquid injection plug 130 side). It is arranged as follows.

Further, the second spacer parts 813 and 814 are arranged between the long side wall parts 113 and 114 of the container body 110 of the container 100 and the first spacer part 811 along the side wall parts of the container 100. It is a metal part. Further, the second spacer parts 813 and 814 are joined to the lid 120 side of the container body 110. Specifically, the second spacer portion 813 is joined to the end of the long side wall portion 113 of the container body 110 on the Z-axis positive direction side, and the second spacer portion 814 is joined to the end portion of the long side wall portion 114 of the container body 110 on the Z-axis positive direction side. It is joined to the end on the positive side of the axis. That is, a space 819 is formed between the lid body 120, the first spacer part 811, and the second spacer parts 813 and 814, and the second spacer parts 813 and 814 are joined to the container body 110 at positions facing the space 819. and two joint portions 940 are formed.

The spacer 800e differs from the above embodiment in that it is arranged on the bottom wall 115 side, whereas the spacer 800 in the above embodiment is arranged on the short side wall 111 or 112 side. This is similar to the spacer 800 in the form of. Therefore, a detailed description of the spacer 800e will be omitted. Note that the spacer 800e is not limited to a metal member, but may be a resin member. That is, the spacer 800e can be formed of a metal member similar to the spacer 800 in the above embodiment, a resin member similar to the above upper gasket 300 (lower gasket 400), or the like.

As described above, the power storage element according to this modification can achieve the same effects as the above embodiment. In particular, in this modification, the first spacer portion 811 of the spacer 800d is disposed on the lid 120 side of the container body 110 (the joint 140 side between the container body 110 and the lid 120), so that the first spacer portion 811 of the spacer 800d Deformation of the lid body 120 side (joint portion 140 side) of 110 can be suppressed. Thereby, even if the electrode body 700a expands, it is possible to suppress deformation of the joint 140 between the container body 110 and the lid 120 in the container 100 and damage to the joint 140.

Furthermore, since the second spacer parts 813 and 814 are joined to the long side walls 113 and 114 of the container body 110 instead of the lid body 120, even if the electrode body 700a expands, the expansion of the electrode body 700a The resulting stress is less likely to be applied to the joint portion 140. This also makes it possible to prevent the joint portion 140 from being damaged.

In addition, since the first spacer portion 811 of the spacer 800d is placed on the gas exhaust valve 122 side apart from the lid 120, an exhaust route (space 819) can be secured when gas is exhausted. ing. Thereby, it is possible to suppress the deterioration of the gas exhaustability from the gas exhaust valve 122. Furthermore, since the first spacer portion 811 is arranged on the side of the liquid injection port 121 and the liquid injection stopper 130 so as to be spaced apart from the lid 120, a liquid injection path (space 819) is secured when injecting the electrolyte. I am able to do that. Thereby, it is possible to suppress a decrease in the pourability of the electrolytic solution.

(Other variations)
Although the power storage element according to the embodiment of the present invention and its modification has been described above, the present invention is not limited to this embodiment and its modification. In other words, the embodiments and modifications thereof disclosed this time are illustrative in all respects, and the scope of the present invention is indicated by the claims rather than the above description, and the meanings and equivalents of the claims are as follows: All changes within the scope are included.

For example, in the above embodiment and its modification, the first spacer portion 811 extends from one end in the first direction of the portion facing the electrode body curved surface 711 to the other end of the electrode body when viewed from the first direction. The electrode body is arranged along the curved surface 711 (in contact with the electrode body curved surface 711). However, a part of the first spacer portion 811 facing the electrode body curved surface 711 in the first direction is not arranged along the electrode body curved surface 711 (does not come into contact with the electrode body curved surface 711). ). However, even in this case, the first spacer portion 811 is arranged along the electrode body curved surface 711 by half the length from one end to the other end in the first direction of the portion facing the electrode body curved surface 711. It is preferably at least 2/3, more preferably at least 2/3, even more preferably at least 3/4. Note that the first spacer portion 811 is preferably disposed along the electrode body curved surface 711 at a central portion of the electrode body curved surface 711 in the first direction.

Further, in the above embodiment and its modified example, the second spacer portion 812 is arranged so that the entire surface thereof is in contact with the short side wall portion 111. However, a portion of the second spacer portion 812 facing the short side wall portion 111 may not be disposed in contact with the short side wall portion 111 in the Y-axis direction. However, it is preferable that the second spacer portion 812 be disposed in contact with the center portion of the short side wall portion 111 in the Y-axis direction. Further, a part of the second spacer portion 812 facing the short side wall portion 111 may not be disposed in contact with the short side wall portion 111 in the first direction. However, it is preferable that the second spacer portion 812 be disposed in contact with the central portion of the short side wall portion 111 in the first direction. Similarly, for the second spacer section 813, a part of the part facing the long side wall part 113 in the second direction or a part of the part facing the long side wall part 113 in the first direction is connected to the long side wall part 113. They may not be arranged in contact with each other. However, it is preferable that the second spacer portion 813 be disposed in contact with the central portion of the long side wall portion 113 in the first direction. The same applies to the second spacer portion 814.

Further, in the embodiment and its modification, any one of the second spacer parts 812, 813, and 814 is joined to the container 100. However, none of the second spacer parts 812, 813, and 814 may be joined to the container 100.

Further, in the above embodiment and its modification, the electrode body curved surface 711 has a curved shape in a semicircular arc shape that protrudes in the second direction when viewed from the first direction. However, the electrode body curved surface 711 can take various shapes, such as an arc shape other than a semicircle, or a part of an ellipse or an ellipse. In this case, the first spacer portion 811 also has a shape corresponding to the electrode body curved surface 711.

Moreover, in the embodiment and its modification, the electrode body 700 is formed so that the length in the second direction is longer than the length in the first direction. However, the electrode body 700 is formed so that the length in the second direction is the same as the length in the first direction, or the length in the second direction is shorter than the length in the first direction. You can.

Further, in the above embodiment and its modification, the electrode body 700 is a wound type electrode body formed by winding an electrode plate. However, the structure of the electrode body 700 is not particularly limited as long as it has a curved electrode surface 711. For example, it may be a bellows-shaped electrode body in which the electrode plate is folded into a bellows shape, or a plurality of flat plate-shaped electrode bodies. A curved surface may be formed by curving a stacked electrode body in which plates are laminated.

Further, the configuration of the positive electrode side in the above embodiment and its modifications can also be applied to the negative electrode side, but both the positive electrode side and the negative electrode side have the configuration of the above embodiment or its modifications. It is not limited to that. That is, either one of the positive electrode side and the negative electrode side may not have the configuration of the above embodiment and its modification.

Note that forms constructed by arbitrarily combining the above embodiments and the above modifications are also included within the scope of the present invention.

Moreover, the present invention can be realized not only as such a power storage element, but also as a spacer or a spacer and a container.

The present invention can be applied to power storage elements such as lithium ion secondary batteries.

10, 10a Energy storage element 100 Container 110, 110a, 110b Container body 111, 111b, 111c, 112 Short side wall 111a Opening 113, 114 Long side wall 115 Bottom wall 120 Lid 121 Liquid injection port 122 Gas discharge valve 130 Note Liquid stopper 140, 910, 920, 930, 940 Joint part 700, 700a Electrode body 710 Electrode body main part 711, 712 Electrode body curved surface 713, 714 Electrode body flat surface 800, 800a, 800b, 800c, 800d, 800e Spacer 810 , 810a, 810b Spacer body 811 First spacer 812, 813, 814 Second spacer 815, 816, 817, 819 Space 818 Recess 820, 820a Spacer end

Claims (4)

A power storage element comprising an electrode body, a spacer, and a metal container housing the electrode body and the spacer,
The electrode body has a curved surface that is curved so as to protrude in a second direction toward the spacer when viewed from the first direction,
The length of the electrode body in the second direction is longer than the length in the first direction,
The spacer has a first metal spacer portion disposed between the container and the curved surface and along the curved surface when viewed from the first direction,
The spacer further includes a second spacer part made of metal and arranged along the container between the container and the first spacer part,
the second spacer section is joined to the container
Energy storage element. A space is formed between the first spacer part and the second spacer part,
The electricity storage element according to claim 1 , wherein the second spacer section is joined to the container at a position facing the space. The container has a container body and a lid,
The electricity storage element according to claim 1 or 2 , wherein the first spacer portion is arranged on the lid side of the container main body. A power storage element comprising an electrode body, a spacer, and a metal container housing the electrode body and the spacer,
The electrode body has a curved surface that is curved so as to protrude in a second direction toward the spacer when viewed from the first direction,
The spacer has a first metal spacer portion disposed between the container and the curved surface and along the curved surface when viewed from the first direction,
The spacer further includes a second spacer part made of metal and arranged along the container between the container and the first spacer part,
the second spacer section is joined to the container,
A space is formed between the first spacer part and the second spacer part,
The second spacer portion is joined to the container at a position facing the space.

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