JP6645533B2 - Storage element - Google Patents

Description

  The present invention relates to a power storage element including an electrode terminal, an electrode body, and a current collector for electrically connecting the electrode terminal and the electrode body.

  The transition from gasoline vehicles to electric vehicles is becoming important as a global environmental issue. For this reason, development of an electric vehicle (EV), a plug-in hybrid electric vehicle (PHEV), a hybrid electric vehicle (HEV), and the like using a power storage element such as a lithium ion secondary battery as a power source has been advanced. In general, such a power storage element includes an electrode body having a positive electrode and a negative electrode, an electrode terminal, and a current collector electrically connecting the electrode body and the electrode terminal.

  Here, conventionally, a power storage element has been proposed in which an electrode body is joined to a current collector and the electrode body is held by being suspended from a lid by the current collector (for example, see Patent Document 1). In this power storage element, each of the plurality of legs hanging from one current collector is joined to each of the plurality of electrode bodies, and each of the electrode bodies is suspended, thereby holding each of the electrode bodies. .

JP 2013-077546 A

  However, the above-described conventional power storage element having a configuration in which the electrode body is hung from the lid by the current collector has a problem that it is susceptible to vibration and impact.

  That is, in the above-described conventional power storage element, since the electrode body is suspended by the current collector, if an excessive load is applied to the current collector due to vibration or impact at the time of collision, the current collector may be deformed. In addition, there is a possibility that damage may occur at the junction between the current collector and the electrode body. In particular, when the current collector is deformed and comes into contact with the opposite pole side, a short circuit is caused.

  The present invention has been made to solve the above problems, and has as its object to provide a power storage element that can improve vibration resistance or shock resistance.

  In order to achieve the above object, an energy storage element according to one embodiment of the present invention is an energy storage element including an electrode terminal, an electrode body, and a container that stores the electrode body, and a first direction of the electrode body. A current collector for electrically connecting the electrode body and the electrode terminal, and a spacer disposed on the first direction side of the electrode body, wherein the current collector is An electrode body connection portion formed to extend in a second direction intersecting with one direction and having an electrode body connection portion connected to the electrode body, the spacer is disposed between the electrode body and the electrode body connection portion, A projection extending in the second direction.

  In addition, the power storage element according to one embodiment of the present invention is a power storage element including an electrode terminal, an electrode body, and a container that stores the electrode body, the power storage element being disposed on a first direction side of the electrode body, A current collector electrically connecting the electrode body and the electrode terminal; and a spacer disposed on the first direction side of the electrode body, wherein the spacer is in a second direction intersecting the first direction. , A support portion is provided so as to be sandwiched between the current collector and the container and supports the current collector.

  According to this, the power storage element includes the spacer on the first direction side of the electrode body, and the spacer is sandwiched between the current collector and the container in the second direction that intersects with the first direction. And a supporting portion for supporting the current collector. Here, when the electrode body is suspended by the current collector, if the current collector is subjected to an excessive load due to vibration or impact, the current collector may be deformed or the current collector may be connected to the electrode body. There is a possibility that the portion may be damaged. However, since the current collector included in the power storage element is supported by the support portion, the current collector can be prevented from swinging due to vibration or impact at the time of a collision, and the current collector can be deformed or collected. Damage to the connection between the conductor and the electrode body can be suppressed. Therefore, according to the power storage element, vibration resistance or shock resistance can be improved.

  Further, the power storage element may include at least two electrode bodies, and the support may be disposed between the two electrode bodies.

  According to this, since the support is arranged between the two electrode bodies, the support can be easily arranged without damaging the metal foil at the end of the electrode body.

  Further, the current collector may be connected to the two electrode bodies, and may have, at a position straddling the two electrode bodies, a concave portion into which a tip portion of the support portion is inserted.

  According to this, the current collector has the concave portion at a position straddling the two electrode bodies, and the distal end portion of the support portion is inserted into the concave portion to dispose the support portion. Can be arranged.

  Further, the support portion may be formed such that an end portion is narrower in width in the second direction than a central portion.

  Here, when the electrode body is formed by laminating the electrodes, a portion where the thickness is increased appears at the end of the electrode body. Therefore, if the widened portion is not escaped, the metal foil at the end of the electrode body and the spacer may interfere with each other, and the metal foil at the end of the electrode body may be damaged. Therefore, by forming the support portion such that the width of the end portion is smaller than that of the central portion, the space where the widened portion of the electrode body escapes can be formed by the narrow end portion of the support portion. Therefore, it is possible to prevent the metal foil at the end of the electrode body from being damaged, and to easily dispose the support portion.

  In addition, the spacer may further include a protrusion protruding from the support in a third direction that intersects the first direction and the second direction.

  According to this, the spacer has a protrusion. For this reason, since the protrusion is located on the first direction side of the current collector, that is, on the side opposite to the electrode body, it is possible to prevent the spacer from moving to the electrode body side and damaging the electrode body. .

  Further, the protrusion may have an insulating property and may be formed so as to cover a surface of the current collector on the first direction side.

  According to this, the projecting portion has an insulating property and is formed so as to cover a surface on the first direction side of the current collector, that is, a surface facing the inner surface of the container. That is, the protruding portion also serves as an insulating plate disposed between the current collector and the container. Therefore, there is no need to provide an insulating plate between the current collector and the container, and the power storage element can be configured with a simple configuration.

  Further, the protruding portion may be formed to be shorter in the second direction than the support portion.

  According to this, since the protruding portion is formed so as to be shorter than the supporting portion, the thickness is reduced by laminating the electrode body in the space formed by shortening the length of the protruding portion. The widened part can be escaped. Further, when the electrolyte is injected, the electrolyte can enter from the space formed by shortening the length of the protruding portion, so that the electrolyte can be efficiently penetrated into the electrode body.

  In addition, the current collector is formed to extend in the second direction, has an electrode body connection portion connected to the electrode body, and the spacer further has a fitting that fits with the electrode body connection portion. You may have a joint part.

  According to this, since the spacer has the fitting portion that fits with the electrode body connection part of the current collector, the spacer can support the electrode body connection part. Thus, the current collector can be suppressed from being deformed to bend due to vibration, impact at the time of a collision, or the like, so that the storage device can have improved vibration resistance or shock resistance.

  The support may have an opening penetrating in the first direction.

  According to this, since the opening is formed in the support portion, the electrolyte can enter from the opening when the electrolyte is injected, and the electrolyte can be efficiently permeated into the electrode body.

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

  According to the electric storage element of the present invention, vibration resistance or shock resistance can be improved.

FIG. 1 is a perspective view schematically showing an appearance of a power storage element according to an embodiment of the present invention. It is a perspective view which shows each component provided in an electric storage element by separating the container main body of the electric storage element which concerns on embodiment of this invention. FIG. 3 is an exploded perspective view showing each component when the power storage element according to the embodiment of the present invention is disassembled. It is a perspective view showing composition of a cathode current collector concerning an embodiment of the invention. It is a perspective view showing composition of a side spacer concerning an embodiment of the invention. It is a perspective view showing composition of a side spacer concerning an embodiment of the invention. It is a top view and a sectional view showing composition of a side spacer concerning an embodiment of the invention. FIG. 3 is a cross-sectional view illustrating an internal configuration of the power storage device when the power storage device according to the embodiment of the present invention is cut along a plane parallel to a YZ plane. FIG. 2 is a cross-sectional view illustrating an internal configuration of the power storage element when the power storage element according to the embodiment of the present invention is cut along a plane parallel to an XY plane. FIG. 9 is a diagram for describing an effect provided by the electric storage element according to the embodiment of the present invention. FIG. 9 is a perspective view illustrating a configuration of a side spacer according to a first modification of the embodiment of the present invention. FIG. 9 is a perspective view illustrating a configuration of a side spacer according to a first modification of the embodiment of the present invention. FIG. 11 is a perspective view illustrating a configuration of a side spacer according to a second modification of the embodiment of the present invention. FIG. 11 is a perspective view illustrating a configuration of a side spacer according to a second modification of the embodiment of the present invention. FIG. 13 is a perspective view illustrating a configuration of a side spacer according to Modification Example 3 of the embodiment of the present invention. FIG. 13 is a perspective view illustrating a configuration of a side spacer according to Modification Example 3 of the embodiment of the present invention.

  Hereinafter, an electric storage device according to an embodiment of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a comprehensive or specific example. Numerical values, shapes, materials, constituent elements, arrangement positions of constituent elements, connection forms, and the like shown in the following embodiments are merely examples, and do not limit the present invention. In addition, among the components in the following embodiments, components not described in the independent claims indicating the highest concept are described as arbitrary components.

  Note that in the following description and drawings, the direction of the winding axis of the electrode body of the power storage element is defined as the X-axis direction (hereinafter, also referred to as a first direction). That is, the X-axis direction (first direction) can be defined as the direction in which the current collectors or the electrode terminals are arranged, or the direction in which the short side surface of the container is opposed.

  The vertical direction of the storage element is defined as a Z-axis direction (hereinafter, also referred to as a second direction). That is, the Z-axis direction (second direction) is the up-down direction when the projecting direction of the electrode terminal is set to the top, and can be defined as the direction in which the feet of the current collector extend or the long direction of the short side surface of the container. Although the Z-axis direction is the vertical direction, the Z-axis direction is not limited to the vertical direction because the Z-axis direction may not be the vertical direction depending on the usage mode.

  Further, a direction intersecting the X-axis direction (first direction) and the Z-axis direction (second direction) is defined as a Y-axis direction (hereinafter, also referred to as a third direction). That is, the Y-axis direction (third direction) can be defined as a direction facing the long side of the container, a short direction of the short side of the container, or a thickness direction of the container.

(Embodiment)
First, the configuration of the storage element 10 will be described.

  FIG. 1 is a perspective view schematically showing an external appearance of a power storage device 10 according to an embodiment of the present invention. FIG. 2 is a perspective view illustrating components included in power storage element 10 by separating container main body 111 of container 100 of power storage element 10 according to the embodiment of the present invention. FIG. 3 is an exploded perspective view showing each component when the power storage device 10 according to the embodiment of the present invention is disassembled. FIG. 3 omits the illustration of the container body 111 and the side spacers 400 and 500 of the container 100.

  The storage element 10 is a secondary battery that can charge and discharge electricity, and more specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. In particular, power storage element 10 is applied to an electric vehicle (EV), a plug-in hybrid electric vehicle (PHEV), or a hybrid electric vehicle (HEV). The storage element 10 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery or a capacitor.

  As shown in these drawings, power storage element 10 includes container 100, positive electrode terminal 200, and negative electrode terminal 300. Further, inside the container 100, the positive electrode current collector 120, the negative electrode current collector 130, the two electrode bodies 141 and 142, the lower insulating members 150 and 160, the side spacers 400 and 500, and the bottom spacer 112 And are housed. The positive electrode terminal 200 has a terminal body 210, a connection part 220, a rivet part 230, and an upper insulating member 240. The negative electrode terminal 300 has a terminal body 310, a connection part 320, and a rivet part. 330 and an upper insulating member 340.

  In addition, in addition to the above-described components, the insulation covering the positive electrode current collector 120, the negative electrode current collector 130, the electrode bodies 141 and 142, the side spacers 400 and 500, and the like from below (for insulation from the container 100). A film or the like may be provided.

  In addition, a liquid such as an electrolytic solution (a non-aqueous electrolytic solution) is sealed in the container 100 of the electric storage element 10, but the liquid is not shown. The type of the electrolytic solution enclosed in the container 100 is not particularly limited as long as the performance of the electric storage element 10 is not impaired, and various types can be selected.

  The container 100 includes a container body 111 having a rectangular tubular shape and having a bottom, and a lid 110 that is a plate-like member that closes an opening of the container body 111. In addition, after housing the electrode bodies 141 and 142 and the like inside the container 100, the lid 110 and the container body 111 are welded or the like, so that the inside can be sealed. The material of the lid 110 and the container body 111 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, or an aluminum alloy.

  Further, the lid 110 is provided with a safety valve 110c for releasing gas generated in the container 100 when the pressure in the container 100 increases and releasing the pressure. The cover 110 has a through-hole 110a into which the rivet 230 of the positive terminal 200 is inserted, and a through-hole 110b into which the rivet 330 of the negative terminal 300 is inserted.

  The electrode bodies 141 and 142 are two power generation elements arranged in parallel, and both are electrically connected to the positive electrode current collector 120 and the negative electrode current collector 130. Note that the electrode body 141 and the electrode body 142 have the same configuration.

  Specifically, the electrode bodies 141 and 142 are members that include a positive electrode, a negative electrode, and a separator and can store electricity. The positive electrode has a structure in which a positive electrode active material layer is formed on a positive electrode base material layer which is a long strip-shaped metal foil made of aluminum, an aluminum alloy, or the like. The negative electrode has a structure in which a negative electrode active material layer is formed on a negative electrode substrate layer which is a long strip-shaped metal foil made of copper, a copper alloy, or the like. The separator is a microporous sheet made of a resin.

  Here, as the positive electrode active material used for the positive electrode active material layer, or the negative electrode active material used for the negative electrode active material layer, a known material may be used as long as it is a positive electrode active material or a negative electrode active material capable of inserting and extracting lithium ions. Can be used.

  The electrode bodies 141 and 142 are formed by winding layers arranged so that the separator is sandwiched between the positive electrode and the negative electrode. In the figure, the shapes of the electrode bodies 141 and 142 are shown as oval, but may be circular or elliptical. Further, the shape of the electrode bodies 141 and 142 is not limited to the wound type, and may be a shape in which flat electrode plates are stacked.

  Here, in the electrode bodies 141 and 142, the positive electrode and the negative electrode are wound while being shifted from each other in the direction of the winding axis (in this embodiment, the virtual axis parallel to the X-axis direction) via the separator. . In the positive electrode and the negative electrode, the portions where the active material is not applied and the base material layer is exposed (the active material layer is not formed) (the active material layer non-formed portion) )have.

  Specifically, the electrode body 141 has, at one end in the winding axis direction (the end in the X-axis plus direction), positive end portions 141a and 141b on which the active material layer non-formed portion of the positive electrode is laminated. ing. Similarly, the electrode body 142 has, at the positive end in the X-axis direction, positive end portions 142a and 142b on which the active material layer-free portion of the positive electrode is laminated. Similarly, the electrode bodies 141 and 142 also have ends on the negative electrode side.

  Further, the electrode bodies 141 and 142 are bundled by being wound around an insulating film 143 which is an insulating film. Here, the insulating film 143 is a rectangular sheet-shaped resin member, is wound around the electrode bodies 141 and 142, and is fixed by being fastened with an insulating tape 144 at the end of winding. In addition, the material of the insulating film 143 is not limited as long as it is a film having an insulating property.

  As described above, since the power storage element 10 has a plurality of electrode bodies (two electrode bodies in the present embodiment), compared with the case where a single electrode body is used for the container 100 having the same volume (volume). It is preferable in the following points. That is, by using a plurality of electrode bodies, the dead space at the corner of the container 100 is reduced and the ratio of the electrode bodies is increased, as compared with the case of using a single electrode body, which leads to an increase in the capacity of the power storage element 10. . In particular, in an electrode body for high input / output (high rate), it is necessary to reduce the amount of the active material on the metal foil as compared with a high-capacity type electrode body. The percentage increases. For this reason, when a single electrode body is used, the number of windings of the electrode increases, so that the electrode is hard and has low flexibility, which makes it difficult to insert the electrode into the container 100. And a highly flexible electrode body can be realized.

  The positive electrode current collector 120 is disposed on the positive electrode side (positive side in the X-axis direction, the first direction positive side) of the electrode bodies 141 and 142, and is electrically connected to the positive electrode terminal 200 and the positive electrodes of the electrode bodies 141 and 142. This is a member having high conductivity and rigidity. The positive electrode current collector 120 is formed of aluminum, an aluminum alloy, or the like, similarly to the positive electrode base layers of the electrode bodies 141 and 142.

  Specifically, the positive electrode current collector 120 is connected to the positive electrodes 141 a and 142 b by welding or the like to the positive electrode side ends 141 a and 141 b and the ends 142 a and 142 b of the electrode bodies 141 and 142. Connected. An opening 120a is formed in the positive electrode current collector 120, and a rivet 230 of a positive electrode terminal 200 described later is inserted into the opening 120a, so that the positive electrode current collector 120 and the positive electrode terminal 200 are separated. Connected.

  The negative electrode current collector 130 is disposed on the negative electrode side (X-axis direction negative side, first direction negative side) of the electrode bodies 141 and 142, and is electrically connected to the negative electrode terminal 300 and the negative electrodes of the electrode bodies 141 and 142. This is a member having high conductivity and rigidity. The negative electrode current collector 130 is formed of copper, a copper alloy, or the like, similarly to the negative electrode base layers of the electrode bodies 141 and 142.

  Specifically, the negative electrode current collector 130 is connected to the negative electrodes of the electrode bodies 141 and 142 by welding or the like to the ends of the electrode bodies 141 and 142 on the negative electrode side. In addition, an opening 130a is formed in the negative electrode current collector 130, and a rivet 330 of a negative electrode terminal 300 described later is inserted into the opening 130a, so that the negative electrode current collector 130 and the negative electrode terminal 300 are separated. Connected.

  The lower insulating member 150 is a rectangular packing fixed to the lid 110 of the container 100 and formed of an insulating resin or the like that insulates the positive electrode current collector 120 from the container 100. The lower insulating member 150 has an opening 150a into which a rivet 230 of the positive electrode terminal 200 described later is inserted.

  Similarly, the lower insulating member 160 is a rectangular packing fixed to the lid 110 of the container 100 and formed of an insulating resin or the like that insulates the negative electrode current collector 130 from the container 100. The lower insulating member 160 has an opening 160a into which a rivet 330 of the negative electrode terminal 300 described later is inserted.

  The positive electrode terminal 200 is an electrode terminal electrically connected to the positive electrodes of the electrode bodies 141 and 142, and the negative electrode terminal 300 is an electrode terminal electrically connected to the negative electrodes of the electrode bodies 141 and 142. In other words, the positive electrode terminal 200 and the negative electrode terminal 300 lead the electricity stored in the electrode bodies 141 and 142 to the space outside the power storage element 10, and also store the electricity in the electrode bodies 141 and 142. These are metal electrode terminals for introducing electricity into the internal space.

  In addition, the positive electrode terminal 200 and the negative electrode terminal 300 are attached to the lid 110 disposed above the electrode bodies 141 and 142. Specifically, as shown in FIG. 3, the positive electrode terminal 200 is provided with a rivet 230 that electrically connects the positive electrode terminal 200 and the positive electrode current collector 120.

  The rivet part 230 is a part formed to protrude from the flat connection part 220, and is a connection member inserted into the opening 120 a of the positive electrode current collector 120 and connected to the positive electrode current collector 120. That is, in the positive electrode terminal 200, the rivet portion 230 is inserted into the through hole of the upper insulating member 240, the through hole 110 a of the lid 110, the opening 150 a of the lower insulating member 150, and the opening 120 a of the positive electrode current collector 120. By caulking, the upper insulating member 240, the lower insulating member 150, and the positive electrode current collector 120 are fixed to the lid 110.

  Here, since the positive electrode terminal 200 has the upper insulating member 240 which is a rectangular packing formed of an insulating resin or the like between the connecting portion 220 and the lid 110, the Insulated. In the positive electrode terminal 200, for example, the terminal body 210 having a bolt shape is inserted into a through hole formed in the connection part 220, so that the terminal body 210 and the positive electrode current collector 120 are electrically connected.

  In addition, the connection part 220 and the rivet part 230 may be integrally formed, or may be formed separately. Since the negative terminal 300 has the same configuration as the positive terminal 200, detailed description of the negative terminal 300 is omitted.

  The side spacers 400 and 500 are spacers arranged on the first direction side (X-axis direction side) of the electrode body and extending in a second direction (Z-axis direction) intersecting the first direction. That is, the side spacers 400 and 500 fill the spaces between the electrode bodies 141 and 142, the positive electrode current collector 120, and the negative electrode current collector 130 and the container 100, so that the electrode bodies 141 and 142 and the positive electrode current collector 120 And, the negative electrode current collector 130 is supported so as not to vibrate with respect to the container 100.

  Specifically, the side spacer 400 is disposed so as to be sandwiched between the positive electrode current collector 120 and the bottom surface of the container 100, and supports the positive electrode current collector 120 from below. That is, the side spacer 400 is disposed so as to be sandwiched between the upper portion of the positive electrode current collector 120 and the bottom surface spacer 112, and supports the positive electrode current collector 120 from below. Similarly, the side spacer 500 is disposed so as to be sandwiched between the upper portion of the negative electrode current collector 130 and the bottom surface spacer 112, and supports the negative electrode current collector 130 from below.

  Thus, the side spacer 400 abuts on a part of the positive electrode current collector 120 in the second direction (Z-axis direction), thereby restricting the movement of the positive electrode current collector 120 in the second direction. Deformation of the lower part of the body 120 in the first direction (X-axis direction) is suppressed. Similarly, the side spacer 500 contacts a part of the negative electrode current collector 130 in the second direction (Z-axis direction), thereby restricting the movement of the negative electrode current collector 130 in the second direction. Deformation of the lower portion of the current collector 130 in the first direction (X-axis direction) is suppressed.

  In addition, a part of the side spacer 400 is disposed on the positive side in the X-axis direction of the positive electrode current collector 120 so as to be sandwiched between the positive electrode current collector 120 and the side wall 111a of the container 100 and extend along the side wall 111a. ing. Further, a part of the side spacer 500 is disposed on the minus side in the X-axis direction of the negative electrode current collector 130 so as to be sandwiched between the negative electrode current collector 130 and the side wall 111b of the container 100 and extend along the side wall 111b. ing.

  In other words, the side spacers 400 and the side spacers 500 are arranged between both ends of the electrode bodies 141 and 142 and the two side walls 111a and 111b of the container 100 so as to sandwich the electrode bodies 141 and 142 from both ends in the X-axis direction. Have been.

  Here, the side spacers 400 and 500 are formed of, for example, a heat-resistant material such as polypropylene (PP), polyphenylene sulfide (PPS), polyethylene terephthalate (PET), ceramic, or an insulating material such as a composite material thereof. Have been. That is, the side spacers 400 and 500 also have a function of insulating the container 100 from the electrode bodies 141 and 142, the positive electrode current collector 120, and the negative electrode current collector 130.

  The side spacers 400 and 500 may be metal spacers as long as they can insulate the positive electrode current collector 120 and the negative electrode current collector 130 from the container 100. For example, the side spacers 400 and 500 may be spacers obtained by coating a metal base material with a resin.

  The bottom spacer 112 is a flat spacer arranged on the bottom of the container body 111. The bottom spacer 112 fills the space between the electrode bodies 141 and 142 and the side spacers 400 and 500 and the bottom surface of the container 100, so that the electrode bodies 141 and 142 and the side spacers 400 and 500 do not vibrate with respect to the container 100. To support. The bottom spacer 112 is formed of the same insulating material as the side spacers 400 and 500, and also has a function of insulating the electrode members 141 and 142 from the container 100.

  Next, the configurations of the positive electrode current collector 120 and the negative electrode current collector 130 will be described in detail. Since the positive electrode current collector 120 and the negative electrode current collector 130 have the same configuration, only the positive electrode current collector 120 will be described below, and the description of the negative electrode current collector 130 will be omitted.

  FIG. 4 is a perspective view showing a configuration of the positive electrode current collector 120 according to the embodiment of the present invention.

  As shown in the drawing, the positive electrode current collector 120 has a terminal connection part 121, an electrode body connection part 122, and a connection part 123. In addition, the electrode body connection part 122 is configured by a plurality of electrode body connection parts (four electrode body connection parts 122a to 122d in the present embodiment).

  The terminal connecting part 121 is a rectangular and flat part that is electrically connected to the positive electrode terminal 200. Specifically, the terminal connection portion 121 is disposed on the positive electrode terminal 200 side (the positive side in the Z-axis direction), and the rivet portion 230 of the positive electrode terminal 200 is inserted into the opening 120a and connected to the rivet portion 230. , And the positive terminal 200.

  Here, the opening 120 a is a circular through-hole formed in the terminal connection part 121, and has a shape corresponding to the outer shape of the rivet part 230. Note that the shape of the opening 120a is not limited to a circular shape, and may be an elliptical shape or a rectangular shape, but is preferably a shape corresponding to the outer shape of the rivet portion 230. The opening 120a may not be a through-hole as long as the opening into which the rivet 230 is inserted, and may be a notch cut out in a semicircular shape or a rectangular shape.

  The electrode body connection parts 122a to 122d are connected to the end of the terminal connection part 121, and are long and flat (bar-shaped) members arranged to extend downward (in the negative direction of the Z axis) from the terminal connection part 121. It is. Specifically, the electrode body connection parts 122a to 122d are arranged on the electrode bodies 141 and 142 side (the negative side in the Z-axis direction), and are connected to the electrode bodies 141 and 142.

  Specifically, the electrode body connection portions 122a to 122d are arranged so as to be twisted 90 degrees from the side surface (the side surface on the plus side in the X-axis direction) of the terminal connection portion 121 and to hang down toward the electrode bodies 141 and 142. Have been. That is, the electrode body connection portions 122a to 122d are members extending in the Z-axis direction, and have opposing surfaces parallel to the XZ plane.

  Then, the electrode body connection parts 122a and 122b are connected to the electrode body 141, and the electrode body connection parts 122c and 122d are connected to the electrode body 142. Specifically, the electrode body connection portion 122a is joined to the positive electrode side end portion 141a of the electrode body 141 by welding such as ultrasonic welding or resistance welding, and the electrode body connection portion 122b is formed by the welding or the like. It is joined to the end 141b of the electrode body 141. The electrode assembly connecting portion 122c is joined to the end 142a of the electrode assembly 142 by the welding or the like, and the electrode assembly connecting portion 122d is joined to the end 142b of the electrode assembly 142 by the welding or the like.

  Further, the electrode body connection portions 122a to 122d are formed to have a length that does not reach the bottom portion of the container body 111. In the present embodiment, the electrode body connection portions 122a to 122d are formed so as to have a length that reaches about half the height of the side surface of the container body 111.

  In the present embodiment, the electrode body connection portions 122a to 122d are formed to have the same length, but may be formed to have different lengths. Further, the electrode body connection portions 122a to 122d may be formed by being bent without being twisted.

  The connecting part 123 is a plate-shaped part that is disposed between the terminal connecting part 121 and the electrode body connecting parts 122a to 122d, and connects the terminal connecting part 121 and the electrode body connecting parts 122a to 122d. Further, a concave portion 123a is formed in the center of the connecting portion 123.

  The concave portion 123a is a concave arranged between the electrode body connection portion 122b and the electrode body connection portion 122c (between the electrode body 141 and the electrode body 142). That is, the concave portion 123a is disposed at a position straddling the two electrode bodies 141 and 142. The distal end of the support portion 410 of the side spacer 400 described later is inserted into the concave portion 123a.

  Next, the configuration of the side spacers 400 and 500 will be described in detail. Since the side spacer 400 and the side spacer 500 have the same configuration, the side spacer 400 will be described below, and the description of the side spacer 500 will be omitted.

  5 and 6 are perspective views showing the configuration of the side spacer 400 according to the embodiment of the present invention. FIG. 6 is a perspective view when FIG. 5 is viewed from obliquely above the back side. FIG. 7 is a plan view and a cross-sectional view showing the configuration of the side spacer 400 according to the embodiment of the present invention. Specifically, (a) of the figure is a plan view when the side spacer 400 is viewed from the front, and (b) of the figure is a sectional view of the side spacer 400 taken along the line AA in (a) of the figure. It is sectional drawing which shows the structure at the time of cutting by a cross section.

  As shown in these figures, the side spacer 400 has a support portion 410, a protruding portion 420, and a fitting portion 430.

  The support portion 410 is a long portion extending in the second direction (Z-axis direction), and has a side surface portion 411, a central portion 412, an upper end portion 413, and a lower end portion 414. The side surface portion 411 is a plate-shaped portion disposed on the plus side in the first direction (X-axis direction) of the support portion 410, and has openings 411a to 411c penetrating in the first direction.

  The openings 411a to 411c are oblong through holes extending in the second direction (Z-axis direction). In addition, the shape of the openings 411a to 411c is not limited to an oval shape, and may be an elliptical shape, a square shape, or the like. In addition, the openings 411a to 411c need not be through holes, but may be cutouts that are cut out in a semicircular or rectangular shape. Further, the number of openings formed in the side surface portion 411 may be other than three, such as one long opening portion is formed in the side surface portion 411.

  The central portion 412 is disposed at a central portion of the support portion 410 in the second direction (Z-axis direction), and has a pair of flat plates extending in the second direction protruding from the side surface portion 411 in the first direction (X-axis direction) on the minus side. It consists of a part. In addition, the central portion 412 has protrusions 412a and 412b that extend in the second direction and protrude in the third direction (Y-axis direction) at the distal end on the minus side in the first direction.

  The protrusion 412a is a portion that protrudes in the third direction minus side, and the protrusion 412b is a portion that protrudes in the third direction plus side. That is, the protrusions 412a and 412b protrude outward from the central portion 412.

  The upper end portion 413 is disposed at an upper end portion of the support portion 410 on the plus side in the second direction, and is formed of a plate-like portion extending in the second direction protruding from the side surface portion 411 on the minus side in the first direction. The upper end portion 413 is formed such that the width (width in the Y-axis direction) becomes narrower toward the front end in the second direction, and has a front end portion 413a at the front end on the plus side in the second direction. The tip portion 413a is a portion to be inserted into the concave portion 123a formed in the positive electrode current collector 120.

  The lower end portion 414 is disposed at a lower end portion of the support portion 410 on the minus side in the second direction, and is formed of a plate-shaped portion that protrudes from the side surface portion 411 on the minus side in the first direction and extends in the second direction. The lower end portion 414 is formed to have a smaller width (width in the Y-axis direction) than the central portion 412. Thereby, spaces 414a and 414b are formed on both sides of the lower end portion 414.

  Thus, the support portion 410 is formed such that the width of the end portion is smaller than that of the center portion in the second direction. Specifically, the width of the central portion 412 in the Y-axis direction is formed to be substantially the same as the width between the opposing surfaces of the electrode assembly connecting portions 122b and 122c of the positive electrode current collector 120, and the lower end portion 414 is formed. Is formed to be narrower than the width of the central portion 412 in the Y-axis direction.

  The protruding portion 420 is a portion that protrudes from the support portion 410 in a third direction (Y-axis direction) that intersects the first direction and the second direction. And a protruding portion 420b protruding in the plus direction.

  The protruding parts 420a and 420b are rectangular and flat parts that extend in the second and third directions from the end of the support part 410 on the positive side in the first direction. That is, the side surface portion 411 of the support portion 410 and the protruding portions 420a and 420b are formed so as to be connected to each other, and constitute one flat plate-shaped portion.

  Further, the protruding portions 420a and 420b are formed such that the length in the second direction is shorter than the supporting portion 410. Thus, spaces 421a and 421b are formed on both sides of the lower end portion 414 below the protruding portions 420a and 420b.

  The fitting portion 430 is a flat plate-shaped portion extending in the second direction (Z-axis direction) protruding in the first direction (X-axis direction) on the minus side from the end of the protrusion 420 in the third direction (Y-axis direction). is there. That is, the fitting portion 430 includes a flat plate-like fitting portion 430a protruding in the first direction minus side from the third direction minus side end of the protruding portion 420a, and a third direction plus side end portion of the protruding portion 420b. And a flat-shaped fitting portion 430b protruding in the first direction minus side.

  Further, the fitting portion 430 has a protruding portion 431 (protruding portions 431a and 431b) extending in the second direction and protruding in the third direction (Y-axis direction) at the distal end on the minus side in the first direction. That is, the protruding portion 431a is a portion protruding from the tip of the fitting portion 430a to the plus side in the third direction, and the protruding portion 431b is a portion protruding from the tip of the fitting portion 430b to the minus side in the third direction. That is, the projections 431a and 431b project inward of the side spacer 400.

  In other words, the protruding portions 431a and 431b protrude toward each other (toward the opposite direction). The protrusions 431a and 412a protrude toward each other, and the protrusions 431b and 412b protrude toward each other.

  Next, the configuration in a state where the side spacer 400 is disposed in the container 100 will be described in detail. Note that the configuration in a state where the side spacer 500 is disposed in the container 100 has the same configuration, and therefore, description of the side spacer 500 side will be omitted.

  FIG. 8 is a cross-sectional view showing an internal configuration of power storage element 10 when power storage element 10 according to the embodiment of the present invention is cut along a plane parallel to the YZ plane. Note that FIG. 7 shows the power storage element 10 cut at the position of the side spacer 400, and the protrusions 420a and 420b of the side spacer 400 are indicated by dotted lines for convenience of description.

  FIG. 9 is a cross-sectional view showing the internal configuration of power storage element 10 when power storage element 10 according to the embodiment of the present invention is cut along a plane parallel to the XY plane. In FIG. 1, the power storage device 10 is cut at a center position in the Z-axis direction.

  As shown in these drawings, the support portion 410 of the side spacer 400 is arranged so as to be sandwiched between the positive electrode current collector 120 and the container 100 in a second direction (Z-axis direction) intersecting the first direction. Thus, the positive electrode current collector 120 is supported. Specifically, the support portion 410 is disposed between the positive electrode current collector 120 and the bottom spacer 112 disposed on the bottom surface of the container 100.

  That is, the lower end portion 414 of the support portion 410 is placed on the bottom spacer 112, so that the bottom spacer 112 supports the support portion 410. In addition, since the positive electrode current collector 120 is placed on the upper end 413 of the support unit 410, the support unit 410 supports the positive electrode current collector 120.

  Here, the positive electrode current collector 120 has, at a position straddling the two electrode bodies 141 and 142, a concave portion 123a into which the tip of the support portion 410 is inserted. That is, the front end portion 413a of the upper end portion 413 of the support portion 410 is inserted into the concave portion 123a formed in the connection portion 123 of the positive electrode current collector 120, so that the positive electrode current collector 120 is placed on the support portion 410. Is done. In addition, the concave portion 123a also has a role of positioning the support portion 410 with respect to the positive electrode current collector 120.

  The bottom spacer 112 and the lower end 414 of the support 410 are preferably in contact with each other, but a slight gap may be formed. Further, it is preferable that the tip portion 413a of the upper end portion 413 of the support portion 410 and the concave portion 123a of the positive electrode current collector 120 are in contact with each other, but a slight gap may be formed.

  Further, a configuration in which the bottom spacer 112 is not disposed on the bottom surface of the container 100 may be used. In this case, the lower end 414 of the support 410 is placed on the bottom surface of the container 100, so that the support 410 supports the positive electrode current collector 120.

  Further, the support portion 410 is arranged between the two electrode bodies 141 and 142. Specifically, the support portion 410 is disposed between the positive electrode end 141b of the electrode body 141 and the positive electrode end 142a of the electrode body 142. More specifically, the support portion 410 is disposed between the electrode body connection portion 122b and the electrode body connection portion 122c of the positive electrode current collector 120.

  Further, the protrusions 412a and 412b of the central portion 412 of the support portion 410 sandwich the electrode assembly connection portions 122b and 122c in the first direction at positions corresponding to the electrode assembly connection portions 122b and 122c of the positive electrode current collector 120, respectively. Are arranged as follows.

  That is, the protruding portions 412a and 412b are arranged on the minus side in the first direction of the electrode body connecting portions 122b and 122c, and the electrode body connecting portions 122b and 122c are protruding portions 412a and 412b and the protruding portions 420a and 420a, respectively. 420b. As described above, the central portion 412 has a function of a fitting portion that fits with the electrode body connecting portions 122b and 122c of the positive electrode current collector 120 by the protrusions 412a and 412b.

  Here, the opening portions 411a to 411c of the side surface portion 411 are used as openings for efficiently penetrating the electrolyte solution into the electrode bodies 141 and 142. However, the opening portions 411a and 411b are formed by the protrusions 412a and 412b. It can also be used as an opening for visually confirming engagement with the body connection portions 122b and 122c. Note that, for the above confirmation, the size of the opening 411a or 411b can be appropriately set.

  The spaces 414 a and 414 b formed on both sides of the lower end portion 414 of the support portion 410 are used as spaces for allowing the portions spread by winding the electrode bodies 141 and 142 to escape. That is, the spread portion enters the spaces 414a and 414b. Accordingly, interference between the metal foils at the ends of the electrode bodies 141 and 142 and the side spacer 400 is suppressed, and damage to the metal foils at the ends of the electrode bodies 141 and 142 can be suppressed.

  The protrusion 420 is arranged on the first direction side of the positive electrode current collector 120 and is formed so as to cover the surface of the positive electrode current collector 120 on the first direction side. The protruding portion 420a covers most of the positive-side ends 141a and 141b of the electrode body 141, and the protruding portion 420b covers most of the positive-side ends 142a and 142b of the electrode body 142. Have been.

  Further, the spaces 421a and 421b formed on both sides of the lower end portion 414 below the protruding portions 420a and 420b are used as spaces for allowing the portions spread by winding the electrode bodies 141 and 142 to escape. That is, the spread portion enters the spaces 421a and 421b. Accordingly, interference between the metal foils at the ends of the electrode bodies 141 and 142 and the side spacer 400 is suppressed, and damage to the metal foils at the ends of the electrode bodies 141 and 142 can be suppressed.

  The spaces 421a and 421b are also used as spaces for efficiently penetrating the electrolyte into the electrode bodies 141 and 142.

  The fitting portion 430 fits with the electrode body connecting portions 122a and 122d of the positive electrode current collector 120. Specifically, the protrusion 431a of the fitting part 430a is arranged at a position corresponding to the electrode body connection part 122a of the positive electrode current collector 120 so as to sandwich the electrode body connection part 122a in the first direction. Further, the protrusion 431b of the fitting portion 430b is arranged at a position corresponding to the electrode assembly connection portion 122d of the positive electrode current collector 120 so as to sandwich the electrode assembly connection portion 122d in the first direction.

  That is, the protruding portions 431a and 431b are arranged on the minus side in the first direction of the electrode body connecting portions 122a and 122d, and sandwich the electrode body connecting portions 122a and 122d with the protruding portions 420a and 420b, respectively.

  The shapes of the protrusions 412a, 412b, 431a, and 431b are not particularly limited. However, it is preferable that the surface on the minus side in the X-axis direction is formed as a curved surface so as not to damage the electrode bodies 141 and 142.

  As described above, according to the electric storage element 10 according to the embodiment of the present invention, the side spacer 400 is provided on the first direction side of the electrode bodies 141 and 142. Then, the side spacer 400 is disposed so as to be sandwiched between the positive electrode current collector 120 and the container 100 in the second direction intersecting the first direction, and the support portion 410 that supports the positive electrode current collector 120 is provided. Have.

  Here, when the electrode bodies 141 and 142 are suspended by the positive electrode current collector 120, if an excessive load is applied to the positive electrode current collector 120 due to vibration or impact, the positive electrode current collector 120 may be deformed, There is a possibility that the connection portion between the positive electrode current collector 120 and the electrode members 141 and 142 may be damaged.

  However, as shown in FIG. 10, since the positive electrode current collector 120 included in the power storage element 10 is supported by the support portion 410, the positive electrode current collector 120 is prevented from swinging due to vibration, impact at the time of collision, or the like. be able to. FIG. 10 is a diagram for describing an effect provided by power storage element 10 according to the embodiment of the present invention.

  Specifically, as shown in the figure, the support portion 410 of the side spacer 400 is disposed so as to be sandwiched between the positive electrode current collector 120 and the container 100 in the second direction (Z-axis direction). Therefore, it is possible to suppress the positive electrode current collector 120 from entering the electrode bodies 141 and 142. That is, since the support portion 410 is stretched between the positive electrode current collector 120 and the container 100, it is possible to prevent the positive electrode current collector 120 from being inclined obliquely and the lower portion from moving to the X axis direction minus side.

  As described above, the side face spacer 400 can suppress the deformation of the positive electrode current collector 120 and the damage of the connection between the positive electrode current collector 120 and the electrode bodies 141 and 142. The same applies to the negative electrode current collector 130 and the side spacer 500. Therefore, according to power storage element 10, in the configuration in which the electrode body is suspended by the current collector, vibration resistance or shock resistance can be improved.

  Further, since the support portion 410 is disposed between the two electrode members 141 and 142, the support portion 410 can be easily disposed without damaging the metal foil at the ends of the electrode members 141 and 142. .

  In addition, the positive electrode current collector 120 has a concave portion 123a at a position straddling the two electrode members 141 and 142, and the support portion 410 is disposed by inserting the tip of the support portion 410 into the concave portion 123a. Further, the support portion 410 can be easily arranged.

  Further, since openings 411a to 411c are formed in support portion 410, the electrolyte can enter from openings 411a to 411c when the electrolyte is injected, and the electrolyte can efficiently penetrate into electrode members 141 and 142. Can be done.

  Further, when the electrodes 141 and 142 are formed by laminating the electrodes, a portion where the thickness is increased appears at the ends of the electrode bodies 141 and 142. That is, the end portions of the electrode bodies 141 and 142 that are not fixed to the electrode body connection portion 122 of the positive electrode current collector 120 are likely to spread. Therefore, if the widened portion is not escaped, the metal foils at the ends of the electrode bodies 141 and 142 may interfere with the side spacer 400, and the metal foils at the ends of the electrode bodies 141 and 142 may be damaged. There is. Therefore, by forming the supporting portion 410 so that the width of the end portion is smaller than that of the central portion, the space where the widened portion of the electrode bodies 141 and 142 escapes by the narrow end portion of the supporting portion 410. Therefore, the metal foils at the ends of the electrode bodies 141 and 142 can be prevented from being damaged, and the support portion 410 can be easily arranged.

  The side spacer 400 has a protruding portion 420 on the opposite side (short side) from the electrode bodies 141 and 142. For this reason, the protrusions 420 can suppress the side spacer 400 from moving toward the electrode bodies 141 and 142 and damaging the electrode bodies 141 and 142.

  The protruding portion 420 has an insulating property and is formed so as to cover a surface on the first direction side of the positive electrode current collector 120, that is, a surface facing the inner surface of the container 100. That is, the protruding portion 420 also serves as an insulating plate disposed between the positive electrode current collector 120 and the container 100. Therefore, there is no need to provide an insulating plate between the positive electrode current collector 120 and the container 100, and the power storage element 10 can be configured with a simple configuration.

  Further, since the protruding portion 420 is formed to be shorter than the supporting portion 410, the electrode bodies 141 and 142 are stacked in a space formed by shortening the length of the protruding portion 420. Thereby, the portion where the thickness is widened can be escaped. In addition, when the electrolyte is injected, the electrolyte can enter from the space formed by shortening the length of the protruding portion 420, so that the electrolyte can efficiently penetrate into the electrode bodies 141 and 142. .

  In addition, since the side spacer 400 has a fitting portion that fits with the electrode body connection part of the positive electrode current collector 120, the electrode spacer connection part can be supported by the side spacer 400. Accordingly, the positive electrode current collector 120 can be suppressed from being deformed to be bent due to vibration, impact at the time of a collision, or the like, so that the storage device 10 can have improved vibration resistance or shock resistance.

  In addition, since the positive electrode current collector 120 and the side spacer 400 and the negative electrode current collector 130 and the side spacer 500 have the same configuration, the negative electrode current collector 130 and the side The same effect as the effect of 120 and the side spacer 400 can be obtained.

(Modification 1)
Next, a first modification of the above embodiment will be described. FIGS. 11 and 12 are perspective views showing the configuration of the side spacer 600 according to the first modification of the embodiment of the present invention. FIG. 11 is a diagram corresponding to FIG. 5 in the above embodiment, and FIG. 12 is a diagram corresponding to FIG. 6 in the above embodiment.

  As shown in these figures, the side spacer 600 has a supporting portion 610 and a protruding portion 620 (protruding portions 620a and 620b). That is, the side spacer 600 does not include the fitting portion 430 of the side spacer 400 in the above embodiment. Further, the support portion 610 has a side surface portion 611, a central portion 612, an upper end portion 613, and a lower end portion 614.

  The side part 611 is formed with openings 611a to 611c penetrating in the first direction similarly to the side part 411 in the above embodiment. However, unlike the side part 411 in the above embodiment, the side part 611 It is arranged on the minus side in the first direction (X-axis direction).

  Further, unlike the central portion 412 in the above embodiment, the central portion 612 does not have the protrusions 412a and 412b. The central portion 612 and the lower end portion 614 are formed to have the same width (width in the Y-axis direction). That is, the width of the central portion 612 in the Y-axis direction is formed to be smaller than the width between the opposing surfaces of the electrode body connection portions 122b and 122c, similarly to the width of the lower end portion 614 in the Y-axis direction.

  Note that the other configuration has the same configuration as the side spacer 400 in the above embodiment, and thus a description thereof will not be repeated.

  As described above, according to the electric storage element according to the first modification of the embodiment of the present invention, the energy storage device according to the above embodiment has the fitting portion, such as improved vibration resistance or shock resistance. The same effect as the effect other than the effect can be obtained. The same configuration can be applied to the side spacer on the negative electrode side.

(Modification 2)
Next, a second modification of the above embodiment will be described. FIG. 13 and FIG. 14 are perspective views showing the configuration of a side spacer 700 according to a second modification of the embodiment of the present invention. FIG. 13 is a diagram corresponding to FIG. 5 in the above embodiment, and FIG. 14 is a diagram corresponding to FIG. 6 in the above embodiment.

  As shown in these figures, the side spacer 700 has a support portion 710 and a protruding portion 720 (protruding portions 720a to 720d). That is, the side spacer 700 has the protrusion 720 instead of the protrusion 620 of the side spacer 600 in the first modification. That is, the protrusion 720 does not cover the surface of the positive electrode current collector 120 on the first direction side.

  Specifically, the protruding portion 720a is a rectangular and flat plate-shaped portion that protrudes in the third direction (Y-axis direction) on the minus side from the upper end of the support portion 710 on the plus side in the first direction. The protruding portion 720b is a rectangular and flat plate-shaped portion that protrudes from the upper end of the support portion 710 on the positive side in the first direction to the positive side in the third direction. The protruding portion 720c is a rectangular and flat plate-shaped portion that protrudes to the third direction minus side from the lower part of the first direction plus side end of the support portion 710. The protruding portion 720d is a rectangular and flat plate-shaped portion that protrudes from the lower portion of the support portion 710 on the positive side in the first direction to the positive side in the third direction.

  Similarly to the support portion 610 of the side spacer 600 according to the first modification, the support portion 710 includes a side portion 711 having openings 711 a to 711 c penetrating in the first direction, a central portion 712, and an upper end. It has a portion 713 and a lower end 714. Further, the other configuration has the same configuration as that of the side spacer 600 according to the first modification, and thus the detailed description is omitted.

  As described above, according to the energy storage device according to Modification 2 of the embodiment of the present invention, the positive electrode current collector 120 of Modification 1 can be improved in vibration resistance or shock resistance. The same effect as the effect other than the effect of covering the surface on one direction side can be obtained. The same configuration can be applied to the side spacer on the negative electrode side. In this modification, an insulating member such as an insulating plate is preferably provided between the side spacer and the container 100.

(Modification 3)
Next, a third modification of the above embodiment will be described. FIGS. 15 and 16 are perspective views showing the configuration of a side spacer 800 according to the third modification of the embodiment of the present invention. FIG. 15 is a diagram corresponding to FIG. 5 in the above embodiment, and FIG. 16 is a diagram corresponding to FIG. 6 in the above embodiment.

  As shown in these drawings, the side spacer 800 does not have the protrusion 720 of the side spacer 700 in the second modification. That is, the side surface spacer 800 has the side surface portion 811, the central portion 812, the upper end portion 813, and the lower end portion 814.

  Further, since the side spacer 800 does not have the protruding portion 720, it has a good liquid injection property, and the openings 711a to 711c of the supporting portion 710 of the side spacer 700 in the second modification are not formed. Openings 711a to 711c may be formed in the spacer 800 to further improve the injectability of the electrolyte.

  As described above, according to the energy storage device according to Modification 3 of the embodiment of the present invention, it is possible to improve the vibration resistance or the shock resistance. The same effect as the effect other than the effect of the presence can be obtained. The same configuration can be applied to the side spacer on the negative electrode side. In this modification, it is also preferable to provide an insulating plate between the side spacer and the container 100.

  As described above, the power storage device according to the embodiment of the present invention and the modification thereof have been described, but the present invention is not limited to the above-described embodiment and the modification thereof. In other words, the embodiments and modifications thereof disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  For example, in the above-described embodiment and its modifications, the support portion is a concave portion having a space formed inside, but the support portion is a solid portion having no space formed inside. May be the part.

  Further, in the above embodiment, the fitting portion sandwiches the electrode body connection portion by the protrusion. However, the configuration in which the fitting portion is fitted to the electrode body connection portion is not limited to the above configuration, and the configuration in which the protrusion is fitted into the concave portion of the electrode body connection portion or the configuration in which the tip portion of the electrode body connection portion is held Any configuration may be used.

  In the above embodiment and its modifications, the power storage element includes two electrode bodies 141 and 142. However, the power storage element may include only one electrode body, and the support portion may be arranged on a side of the one electrode body. In addition, the power storage element includes three or more electrode bodies, and one support portion is disposed between any two of the three or more electrode bodies, or two or more support portions are provided. May be arranged.

  In the above-described embodiment and its modifications, the tip of the support is inserted into the recess of the current collector. However, the concave portion is not formed in the current collector, and the current collector may be placed on the support.

  Further, in the above-described embodiment and its modification, the current collector and the electrode terminal are connected by caulking by the rivet portion, but the connection method is not limited to caulking, and the connection method is any method. It may be.

  Further, in the above-described embodiment and its modifications, the two electrode body connection portions of the current collector are connected to one electrode body. However, the number of electrode body connection portions connected to one electrode body is limited. Is not limited, and may be one or three or more.

  In the above-described embodiment and its modifications, the second direction is the Z-axis direction. However, the second direction may be any direction that intersects with the first direction (X-axis direction). It may be slightly inclined from the direction. Although the third direction is the Y-axis direction, the third direction may be any direction that intersects the first direction and the second direction, and may be a direction slightly inclined from the Y-axis direction. .

  Further, in the above-described embodiment and its modified example, the negative electrode current collector and the side spacer have the same configuration as the positive electrode current collector and the side spacer. Only the current collector and the side spacer may be used. Alternatively, only the negative electrode current collector and the side spacer may have the above configuration.

  Further, a mode constructed by arbitrarily combining the above-described embodiment and the above-described modified examples is also included in the scope of the present invention. Further, the present invention can be realized not only as the above-described power storage element but also as a side spacer included in the power storage element.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a power storage element such as a lithium ion secondary battery.

DESCRIPTION OF SYMBOLS 10 Electric storage element 100 Container 110 Lid 110a, 110b Through-hole 110c Safety valve 111 Container main body 112 Bottom spacer 120 Positive electrode collector 120a, 130a, 150a, 160a Opening 121 Terminal connection part 122, 122a-122d Electrode connection part 123 Connection Part 123a concave part 130 negative electrode current collector 141, 142 electrode body 141a, 141b, 142a, 142b end part 143 insulating film 144 insulating tape 150, 160 lower insulating member 200 positive electrode terminal 210, 310 terminal body 220, 320 connecting part 230, 330 Rivets 240, 340 Upper insulating member 300 Negative terminal 400, 500, 600, 700, 800 Side spacers 410, 610, 710 Supports 411, 611, 711, 811 Sides 411a to 411 , 611 a to 611 c, 711 a to 711 c Opening 412, 612, 712, 812 Central 412 a, 412 b, 431, 431 a, 431 b Projection 413, 613, 713, 813 Upper end 413 a Tip 414, 614, 714, 814 Lower end Part 414a, 414b, 421a, 421b Space 420, 420a, 420b, 620, 620a, 620b, 720, 720a, 720b, 720c, 720d Projection 430, 430a, 430b Fitting part

Claims (5)

An electrode device including an electrode terminal, an electrode body, and a container for housing the electrode body,
A current collector that is arranged on the first direction side of the electrode body and electrically connects the electrode body and the electrode terminal;
A spacer disposed on the first direction side of the electrode body,
The current collector is formed to extend in a second direction that intersects the first direction, and has an electrode body connection portion connected to the electrode body,
The energy storage element, wherein the spacer is disposed between the electrode body and the electrode body connection portion, and has a protrusion extending in the second direction. The power storage device according to claim 1, wherein the spacer further includes a support portion that is disposed so as to be sandwiched between the current collector and the container in the second direction, and that supports the current collector. The power storage device according to claim 1, wherein the spacer further includes a protrusion protruding in a third direction that intersects the first direction and the second direction. The electric storage device according to any one of claims 1 to 3, wherein the spacer further includes a fitting portion that fits with the electrode body connection portion. The power storage element according to any one of claims 1 to 4, wherein the protrusion has a curved surface facing the electrode body.

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