JP2016004633A - Power storage element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage element that has plural electrode bodies and is enhanced in quality.SOLUTION: A power storage element having two or more electrode bodies arranged in a first direction has a positive electrode power collector connected to end portions of two electrode bodies 141 and 142 out of the two or more electrode bodies in a second direction intersecting to the first direction, and a spacer 400 which is partially disposed between the two electrode bodies 141 and 142. The spacer 400 has a main body portion disposed between the two electrode bodies 141 and 142 and a first wall portion which is disposed at an end portion of the main body portion in a third direction intersecting to the first and second directions, configured to extend in the first and second directions and located at the side surface sides in the third direction of the two electrode bodies 141 and 142.

Description

  The present invention relates to a power storage device including a plurality of electrode bodies.

  The shift from gasoline cars to electric cars has become important as a global environmental problem. 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 is in progress. Such a power storage device generally includes an electrode body having a positive electrode and a negative electrode, an electrode terminal, and a current collector that electrically connects 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 held by hanging the electrode body from a lid with the current collector (see, for example, Patent Document 1).

  In this power storage element, each of a plurality of legs suspended from one current collector is joined to each of a plurality of electrode bodies, and each electrode body is suspended to hold each electrode body. .

JP 2011-8944 A

  Here, the current collector provided in the power storage element includes a connection portion connected to an end portion of the electrode body (positive electrode or negative electrode active material layer non-formation portion), and the connection portion includes the end portion and the ultrasonic wave. Connected by welding or the like.

  That is, for example, a current collector connected to two electrode bodies includes at least two connection parts connected to these electrode bodies, and these connection parts are arranged at the end portions of the two electrode bodies arranged side by side. Aligned to be placed. In this state, welding (joining process) is performed between each connection portion and the end portion of the electrode body.

  In this joining step, it is required that welding between the electrode body and each of the connecting portions of the current collector is performed with high accuracy. Therefore, when welding is performed, each of the at least two connection portions of the current collector needs to be arranged in a normal position in a normal posture with respect to the ends of the two electrode bodies (exact alignment). Need).

  However, conventionally, the two electrode bodies are aligned with the current collector, for example, as a single bundle wound with an insulating film. Therefore, for example, there are cases where the two electrode bodies are displaced from each other when the two electrode bodies are bound by an insulating film. In addition, since it is difficult to completely restrain the two electrode bodies in the binding with the insulating film, the two electrode bodies may be misaligned at the time of alignment between the binding object and the current collector.

  Therefore, in a power storage device including a plurality of electrode bodies, it is important to keep at least two power storage devices connected to the current collector in a correct posture and maintain the state.

  An object of the present invention is to provide a power storage device having a plurality of electrode bodies and having improved quality in consideration of the above-described conventional problems.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention is a power storage device including two or more electrode bodies arranged in a first direction, and two of the two or more electrode bodies are provided. A current collector connected to an end of the electrode body in a second direction intersecting the first direction, and a spacer partially disposed between the two electrode bodies; A main body portion disposed between two electrode bodies, and an end portion of the main body portion in a third direction intersecting the first direction and the second direction, the first direction and the second direction A first wall portion extending on the side surface in the third direction of each of the two electrode bodies.

  According to this configuration, the power storage element includes the spacer interposed between the two electrode bodies, and the spacer is disposed between the two electrode bodies and the two electrode bodies. And a first wall portion that can be pressed in the direction of the main body portion.

  That is, the spacer according to this aspect functions as a member that regulates the distance in the arrangement direction (first direction) of the two electrode bodies and regulates the position of the two electrode bodies in the third direction.

  In addition, since the first wall portion is provided so as to be able to come into contact with the side surface on the third direction side of the two electrode bodies, for example, each of the two electrode bodies is arranged in the first direction. The rotation about the parallel axis is also suppressed.

  As described above, the positions of the two electrode bodies in the first direction and the third direction are restricted by the spacer, and the rotation around the axis in the first direction (twist between the electrode bodies) is also suppressed by the spacer.

  Thereby, the edge part of the 2nd direction of two electrode bodies is positioned in a regular position (relative regular position in two electrode bodies). As a result, joining by welding or the like between the two electrode bodies combined via the spacer and the current collector is performed with high accuracy.

  In addition, when the storage element according to this aspect is used, when a vibration or the like is applied, the relative displacement between the two electrode bodies is suppressed by the spacer. Therefore, for example, the occurrence of problems such as poor bonding with the current collector connected to the two electrode bodies or deformation of the current collector due to the relative displacement of the two electrode bodies is suppressed.

  As described above, the power storage device according to this aspect is a power storage device including a plurality of electrode bodies, and is a power storage device with improved quality.

  In the energy storage device according to one embodiment of the present invention, the spacer is further disposed at an end portion of the main body portion opposite to the first wall portion, and extends in the first direction and the second direction. You may have the provided 2nd wall part.

  According to this configuration, since the two electrode bodies are sandwiched by the first wall portion and the second wall portion from both sides in the third direction, position regulation in the third direction and rotation around the axis in the first direction Is more reliably suppressed.

  The power storage device according to one embodiment of the present invention further includes an electrode terminal, and the current collector is connected to an end of the electrode body in the second direction, the electrode terminal, And a terminal connection portion connected, wherein the first wall portion abuts on the terminal connection portion of the current collector.

  According to this configuration, the spacer is disposed so as to support the terminal connection portion of the current collector from the inside of the power storage element. Accordingly, for example, when a relatively large load is applied to the electrode terminal, the terminal connection portion is prevented from being deformed so as to be inclined toward the two electrode bodies.

  Therefore, due to the deformation of the terminal connection portion, for example, occurrence of a situation in which a portion (electrode body connection portion) connected to the electrode body of the current collector damages the electrode body is suppressed.

  Moreover, the electrical storage element which concerns on 1 aspect of this invention WHEREIN: A said 1st wall part is good also as having the convex part contact | abutted to the said terminal connection part in the surface at the side of the said terminal connection part.

  According to this configuration, when there is an object (including a part of the terminal connection portion) protruding from the surface on the inner side (two electrode body side) of the terminal connection portion, the first wall portion Can be brought into contact with the terminal connecting portion while avoiding the object. That is, the terminal connection portion can be supported more appropriately by the spacer.

  The power storage device according to one embodiment of the present invention further includes a container that accommodates the two or more electrode bodies, and the spacer has an end opposite to the first wall portion that contacts the inner surface of the container. It may be arranged in contact.

  According to this configuration, the spacer interposed between the two electrode bodies also functions as a tension member between the terminal connection portion of the current collector and the inner surface of the container. Thereby, suppression of a deformation | transformation of an electrical power collector is ensured more, for example. That is, the possibility of occurrence of a situation such as damage to the electrode body due to deformation of the current collector is further reduced.

  Further, in the energy storage device according to one aspect of the present invention, the current collector includes a plurality of electrode body connection portions connected to the end portions in the second direction of the two electrode bodies, and the spacer The main body may include a current collector abutting portion located on the main body side of at least one electrode body connecting portion of the plurality of electrode body connecting portions.

  According to this configuration, the electrode body contact portion of the spacer is in contact with the end face on the inner side (spacer main body side) of at least one electrode body connection portion of the current collector. This suppresses the current collector from being deformed so that the electrode body connecting portion moves inward. As a result, for example, the occurrence of a situation in which the electrode body connecting portion damages the electrode body is more reliably suppressed.

  Further, in the energy storage device according to one aspect of the present invention, the spacer further includes an end portion of the main body portion where the first wall portion is disposed, or an end portion opposite to the first wall portion, A protrusion may be provided so as to fill at least one of the two electrode bodies.

  According to this configuration, the protruding portion is disposed so as to fill the space between the end of the main body of the spacer and the electrode body, which is a position where a gap is likely to be generated between the spacer and one electrode body. This suppresses the movement of foreign matter from one end of the two electrode bodies in the second direction to the other end, that is, the movement of foreign matter from one of the positive and negative electrode sides to the other. Is done. As a result, for example, the occurrence of an internal short circuit due to the movement of the conductive foreign matter is suppressed.

  In addition, this invention can be implement | achieved not only as an electrical storage element provided with such a spacer but also as the said spacer.

  ADVANTAGE OF THE INVENTION According to this invention, it is an electrical storage element provided with a some electrode body, Comprising: An electrical storage element with improved quality can be provided.

It is a perspective view which shows typically the external appearance of the electrical storage element which concerns on embodiment. It is a perspective view which shows each component at the time of isolate | separating the container of the electrical storage element which concerns on embodiment to the cover body and the container main body. It is a disassembled perspective view of the electrical storage element which concerns on embodiment. It is a perspective view which shows the structure of the positive electrode electrical power collector which concerns on embodiment. It is a perspective view which shows the structure of the spacer which concerns on embodiment. It is a disassembled perspective view which shows the structure of the electrode body binding thing which concerns on embodiment. It is a front schematic diagram which shows the positional relationship of the spacer which concerns on embodiment, and two electrode bodies. It is a side surface schematic diagram corresponding to Drawing 7A. It is a disassembled perspective view which shows the positional relationship of the positive electrode electrical power collector which concerns on embodiment, and a spacer. It is a front view which shows the positional relationship of the positive electrode electrical power collector which concerns on embodiment, and a spacer. It is a perspective view which shows the characteristic part of the spacer which concerns on the modification 1 of embodiment. It is a front view which shows the positional relationship of the positive electrode electrical power collector which concerns on the modification 1 of embodiment, and a spacer. It is a perspective view which shows the structure of the spacer which concerns on the modification 2 of embodiment. It is a perspective view which shows the structure of the spacer which concerns on the modification 3 of embodiment.

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

  Note that in the following description and drawings, the arrangement direction of a plurality of electrode bodies (two electrode bodies in the present embodiment) included in the power storage element is defined as a Y-axis direction (hereinafter also referred to as a first direction). That is, the Y-axis direction (first direction) can be defined as the opposing direction of the long side surface of the container, the short direction of the short side surface of the container, or the thickness direction of the container.

  The winding axis direction of the electrode body is defined as the X-axis direction (hereinafter also referred to as the second direction). That is, the X-axis direction (second direction) can be defined as the direction in which two current collectors or two electrode terminals are arranged, or the opposing direction of the short side surface of the container.

  A direction intersecting with the Y-axis direction (first direction) and the X-axis direction (second direction) is defined as a Z-axis direction (hereinafter also referred to as a third direction). That is, the Z-axis direction (third direction) is a vertical direction when the protruding direction of the electrode terminal in the storage element is upward, and is a direction in which the legs of the current collector extend or a longitudinal direction of the short side surface of the container Can be defined.

  Note that 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 use mode.

(Embodiment)
First, a configuration outline of the electricity storage device 10 will be described with reference to FIGS.

  FIG. 1 is a perspective view schematically showing an external appearance of a power storage device 10 according to the embodiment. FIG. 2 is a perspective view illustrating each component when the container 100 of the electricity storage device 10 according to the embodiment is separated into the lid body 110 and the container body 111.

  FIG. 3 is an exploded perspective view of the energy storage device 10 according to the embodiment. In FIG. 3, the container main body 111 of the container 100 is omitted.

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

  The power storage element 10 is a secondary battery that can charge electricity and discharge electricity, and more specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery.

  The power storage element 10 is applied to, for example, an electric vehicle (EV), a plug-in hybrid electric vehicle (PHEV), or a hybrid electric vehicle (HEV). In addition, the electrical storage element 10 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it.

  As shown in FIGS. 1 to 3, the storage element 10 includes electrode bodies 141 and 142 arranged in a first direction (Y-axis direction) and a second direction (X-axis direction) of the two electrode bodies 141 and 142. The positive electrode current collector 120 disposed at the end of each of the electrodes and the spacer 400 partially disposed between the two electrode bodies 141 and 142 are provided.

  More specifically, the electricity storage device 10 according to the present embodiment further includes a container 100, a negative electrode current collector 130, a positive electrode terminal 200, and a negative electrode terminal 300. The container 100 accommodates two electrode bodies 141 and 142, and the positive electrode current collector 120 and the negative electrode current collector 130 so as to sandwich the two electrode bodies 141 and 142 from the second direction (X-axis direction). Is arranged.

  The positive terminal 200 has a terminal body 210, a connection part 220, and a rivet part 230.

  Between the connection part 220 and the container 100, an upper insulating member 240 having a terminal recess 241 that supports the lower end of the terminal body 210 is disposed.

  The negative electrode terminal 300 includes a terminal main body 310, a connection part 320, and a rivet part 330.

  Between the connection part 320 and the container 100, the upper insulating member 340 in which the terminal recessed part 341 that supports the lower end part of the terminal body 310 is formed is disposed.

  In addition, a liquid such as an electrolytic solution (non-aqueous electrolytic solution) is sealed inside the container 100 of the electricity storage element 10, but the illustration of the liquid is omitted. In addition, as long as it does not impair the performance of the electrical storage element 10, as the electrolyte solution enclosed with the container 100, there is no restriction | limiting in particular and various things can be selected.

  The container 100 includes a container body 111 having a rectangular cylindrical shape and a bottom, and a lid body 110 that is a plate-like member that closes the opening of the container body 111. In addition, the container 100 can seal the inside by accommodating the electrode bodies 141 and 142 and the like and then welding the lid body 110 and the container body 111 to each other. The material of the lid body 110 and the container body 111 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, or aluminum alloy.

  Further, the lid 110 is provided with a safety valve 110c for releasing the gas generated in the container 100 and releasing the pressure when the pressure in the container 100 rises. Further, the lid body 110 is formed with a through hole 110 a into which the rivet portion 230 of the positive electrode terminal 200 is inserted, and a through hole 110 b into which the rivet portion 330 of the negative electrode terminal 300 is inserted.

  Furthermore, lid body recesses 110d and 110e are formed in lid body 110. The lid concave portion 110d is a portion that accommodates a convex portion formed on the back side of the terminal concave portion 241 included in the upper insulating member 240. The lid concave portion 110e is a portion that accommodates a convex portion formed on the back side of the terminal concave portion 341 included in the upper insulating member 340.

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

  Specifically, each of the electrode bodies 141 and 142 includes a positive electrode, a negative electrode, and a separator, and is a member that can store electricity. In the positive electrode, 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 or an aluminum alloy. Further, the negative electrode is obtained by forming a negative electrode active material layer on a negative electrode base material layer that is a long strip-shaped metal foil made of copper, a copper alloy, or the like. The separator is a microporous sheet made of resin.

  Here, 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 may be a known material as long as it is a positive electrode active material or a negative electrode active material capable of occluding and releasing lithium ions. Can be used.

  And the electrode bodies 141 and 142 are formed by winding what is arranged in layers so that the separator is sandwiched between the positive electrode and the negative electrode. 2 and 3, the electrode bodies 141 and 142 have an oval shape, but may have a circular shape or an oval shape. Moreover, the shape of the electrode bodies 141 and 142 is not limited to the winding type, and may be a shape in which flat plate plates are laminated.

  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 a winding axis (in this embodiment, a virtual axis parallel to the X-axis direction) via a separator. . And the positive electrode and the negative electrode are the portions where the active material is not applied and the base material layer is exposed (the active material layer is not formed) at the edge portions in the respective shifted directions (the active material layer non-formed portion) )have.

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

  The electrode bodies 141 and 142 combined through the spacer 400 are bundled by winding an insulating film 143 that is an insulating film around the periphery. The insulating film 143 is, for example, a rectangular sheet-shaped resin member. Note that the material of the insulating film 143 is not limited to a specific material as long as it is an insulating film.

  In the present embodiment, the electrode bodies 141 and 142 are bundled by two insulating films 143, and a plurality of insulating tapes 144 are attached to the overlapping portion of the two insulating films 143. As a result, one electrode assembly bundle 500 including the two electrode bodies 141 and 142 and the spacer 400 is formed.

  Details of the spacer 400 and the electrode assembly bundle 500 according to the present embodiment will be described later with reference to FIGS.

  As described above, since the electricity storage element 10 has a plurality of electrode bodies (two electrode bodies in the present embodiment), compared to 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 in the corner portion of the container 100 is reduced and the ratio of the electrode bodies is improved as compared with the case of using a single electrode body, leading 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 active material on the metal foil as compared with a high capacity type electrode body. The proportion increases. For this reason, when a single electrode body is used, the number of turns of the electrode is increased, so that it is hard and flexible and difficult to insert into the container 100. However, by using a plurality of electrode bodies, the number of turns in one electrode body is increased. And an electrode body with high flexibility can be realized.

  The positive electrode current collector 120 is disposed on the positive electrode side (second direction (X-axis direction) plus 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. It is a member having conductivity and rigidity. Note that the positive electrode current collector 120 is formed of aluminum or an aluminum alloy as in the case of the positive electrode base material layers of the electrode bodies 141 and 142.

  Specifically, the positive electrode current collector 120 is connected to the positive electrodes of the electrode bodies 141 and 142 by being joined to the end portions 141a and 142a on the positive electrode side of the electrode bodies 141 and 142 by welding or the like. Further, the positive electrode current collector 120 is formed with a through hole 120a. By inserting a rivet portion 230 of the positive electrode terminal 200 described later into the through hole 120a, the positive electrode current collector 120 and the positive electrode terminal 200 are connected. Connected.

  More specifically, as shown in FIG. 4, the positive electrode current collector 120 has a terminal connection part 121 and an electrode body connection part 122. Moreover, the electrode body connection part 122 is comprised from the several electrode body connection part (In this Embodiment, four electrode body connection parts 122a, 122b, 122, and 122d).

  The terminal connection 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 (third direction (Z-axis direction) plus side), and the rivet portion 230 of the positive electrode terminal 200 is inserted into the through hole 120a and caulked. Are connected to the positive terminal 200.

  Further, the terminal connection portion 121 is formed with an opening 120b that penetrates an insulating convex portion 150c formed on the back side of a lower concave portion 150b of the lower insulating member 150 described later. The insulating protrusion 150c inserted into the opening 120b slightly protrudes (about several millimeters) from the lower surface of the terminal connection portion 121 (the surface on the minus side in the third direction (Z-axis direction)). The structure on the lower surface side of the terminal connection portion 121 will be described later with reference to FIG.

  The through hole 120a may not be a circular hole as long as the rivet portion 230 can be inserted into the through hole 120a, or may be a semicircular or rectangular cutout. . Similarly, the opening 120b may be a notch or the like.

  The electrode body connection parts 122a to 122d are connected to the end part of the terminal connection part 121, and are long and flat plate-like (rod-like) members arranged to extend downward (Z-axis minus direction) from the terminal connection part 121. It is. These electrode body connecting portions 122a to 122d are connected to the electrode bodies 141 and 142 by welding, for example.

  In the present embodiment, the electrode body connection portions 122a to 122d are twisted by 90 degrees from the side surface (the side surface on the X axis direction plus side) of the terminal connection portion 121 and hang down toward the electrode bodies 141 and 142. Has been placed. That is, the electrode body connection parts 122a to 122d are members extending in the Z-axis direction and have a surface parallel to the XZ plane.

  The electrode body connecting portions 122a and 122b are connected to the end of the electrode body 141 in the second direction (X-axis direction), and the electrode body connecting portions 122c and 122d are connected in the second direction (X-axis direction) of the electrode body 142. ) Is connected to the end. Specifically, the electrode body connection parts 122a and 122b are arranged so as to sandwich the end part 141a on the positive electrode side of the electrode body 141, and are connected to the positive electrode side of the electrode body 141 by welding such as ultrasonic welding or resistance welding. Joined to the end 141a.

  The electrode body connecting portions 122c and 122d are arranged so as to sandwich the end portion 142a on the positive electrode side of the electrode body 142, and are joined to the end portion 142a of the electrode body 142 by the welding or the like.

  The electrode body connecting portions 122a to 122d may be formed by being bent without being twisted. Further, the positive electrode current collector 120 may have only one electrode body connecting portion with respect to one electrode body (141 or 142). That is, the positive electrode current collector 120 may include only two electrode body connection portions, that is, an electrode body connection portion connected to the electrode body 141 and an electrode body connection portion connected to the electrode body 142.

  Further, for example, a current collector having one or more electrode body connection portions connected to the end portion 141a of the electrode body 141, and a current collector having one or more electrode body connection portions connected to the end portion 142a of the electrode body 142 The body may be a separate body.

  The negative electrode current collector 130 is disposed on the negative electrode side (second direction (X axis direction) minus 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. It is a member having conductivity and rigidity. Note that the negative electrode current collector 130 is formed of copper or a copper alloy or the like, similarly to the negative electrode base material 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 joining the negative electrode side ends of the electrode bodies 141 and 142 by welding or the like. Further, the negative electrode current collector 130 is formed with a through hole 130a. By inserting a rivet portion 330 of the negative electrode terminal 300 described later into the through hole 130a, the negative electrode current collector 130 and the negative electrode terminal 300 are connected. Connected.

  The negative electrode current collector 130 has a terminal connection part 131 having a through hole 130a and an opening part 130b, and four current collector connection parts. The positive electrode current collector shown in FIG. The configuration is the same as that of the body 120. Therefore, detailed description of the negative electrode current collector 130 is omitted.

  The lower insulating member 150 is a rectangular packing that is fixed to the lid 110 of the container 100 and formed of an insulating resin that insulates the positive electrode current collector 120 and the container 100. The lower insulating member 150 is formed with a through hole 150a into which the rivet portion 230 of the positive electrode terminal 200 is inserted, and a lower concave portion 150b that accommodates a convex portion formed on the back side of the lid concave portion 110d of the lid body 110. Has been.

  Similarly, the lower insulating member 160 is a rectangular packing that is fixed to the lid 110 of the container 100 and formed of an insulating resin that insulates the negative electrode current collector 130 from the container 100. The lower insulating member 160 is formed with a through hole 160a into which the rivet portion 330 of the negative electrode terminal 300 is inserted, and a lower concave portion 160b that accommodates a convex portion formed on the back side of the lid concave portion 110e of the lid 110. Has been.

  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.

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

  The rivet part 230 is a part that protrudes from the flat connection part 220, and is a connection member that is inserted into the through hole 120 a of the positive electrode current collector 120 and connected to the positive electrode current collector 120. That is, the rivet portion 230 is inserted into the through hole of the upper insulating member 240, the through hole 110 a of the lid body 110, the through hole 150 a of the lower insulating member 150, and the through hole 120 a of the positive electrode current collector 120 and caulked. Thereby, the positive terminal 200 is fixed to the lid 110 together with the upper insulating member 240, the lower insulating member 150, and the positive electrode current collector 120.

  Here, the positive electrode terminal 200 is insulated from the lid body 110 by an upper insulating member 240 that is a rectangular packing formed of an insulating resin or the like disposed between the connection portion 220 and the lid body 110. The In addition, since the positive terminal 200 is inserted into a through-hole formed in the connecting portion 220, for example, a bolt-shaped terminal main body 210, the terminal main body 210 and the positive electrode current collector 120 are electrically connected.

  Further, the lower end portion of the terminal body 210 is formed in a non-circular cross section (in this embodiment, a rounded rectangle) perpendicular to the axial direction (Z-axis direction) of the terminal body 210, for example, as shown in FIG. As described above, the rotation around the axis is restricted by engaging with the terminal recess 241 of the upper insulating member 240.

  Thereby, for example, when a conductive member such as a bus bar is fastened to a bolt-shaped terminal body 210 with a nut, the rotation of the terminal body 210 around the axis is restricted, and the fastening is performed efficiently and reliably. Can do.

  In addition, the connection part 220 and the rivet part 230 may be formed integrally, and may be comprised separately. Further, since the negative electrode terminal 300 has the same configuration as that of the positive electrode terminal 200, a detailed description of the negative electrode terminal 300 is omitted.

  Next, details of the spacer 400 according to the embodiment will be described with reference to FIGS.

  FIG. 5 is a perspective view showing a configuration of the spacer 400 according to the embodiment.

  FIG. 6 is an exploded perspective view showing the configuration of the electrode assembly bundle 500 according to the embodiment.

  FIG. 7A is a schematic front view showing a positional relationship between the spacer 400 and the two electrode bodies 141 and 142 according to the embodiment. FIG. 7B is a schematic side view corresponding to FIG. 7A.

  7A and 7B, the end face of the spacer 400 is hatched for easy identification of the spacer 400. This also applies to FIGS. 9 and 11 described later.

  The spacer 400 according to the present embodiment is a spacer partially disposed between the two electrode bodies 141 and 142. Specifically, as illustrated in FIGS. 5 to 7B, the spacer 400 includes a main body 410 arranged between the two electrode bodies 141 and 142, and a third direction (Z-axis direction) of the main body 410. And a first wall 420 disposed at the end.

  The first wall 420 extends in the first direction (Y-axis direction) and the second direction (X-axis direction), and is in the third direction (Z-axis direction) of each of the two electrode bodies 141 and 142. It arrange | positions so that it may be located in a side surface side. That is, the first wall 420 is disposed along the side surfaces of the two electrode bodies 141 and 142. In other words, the first wall 420 is disposed at a position facing the side surface.

  Specifically, the first wall portion 420 is provided so as to form a surface that extends along the XY plane at the upper end portion (third direction (Z-axis direction) plus side end portion) of the main body portion 410. In this embodiment, the two electrode bodies 141 and 142 abut from above.

  In the present embodiment, the first wall portion 420 also functions as a member that suppresses deformation of the current collector (the positive electrode current collector 120 and the negative electrode current collector 130). Moreover, it has the convex part 421 as a structure for improving the suppression effect. The positional relationship between the first wall 420 and the current collector will be described later with reference to FIGS.

  In the present embodiment, the first wall 420 is separated into a positive first wall 420a and a negative first wall 420b.

  In addition, the spacer 400 according to the present embodiment further includes a second wall portion 430 disposed at an end portion of the main body portion 410 opposite to the first wall portion 420. The second wall portion 430 extends in the first direction (Y-axis direction) and the second direction (X-axis direction).

  In this Embodiment, the 2nd wall part 430 is arrange | positioned so that the side surface opposite to the side surface arrange | positioned so that the 1st wall part 420 may follow along each of the two electrode bodies 141 and 142. . More specifically, in the present embodiment, the second wall portion 430 is in contact with the respective side surfaces of the two electrode bodies 141 and 142.

  In addition, a protrusion 450 is provided at the end of the main body 410 (in this embodiment, the end where the second wall 430 is disposed). Further, one or more (one in this embodiment) main body holes 412 that penetrate in the thickness direction are formed in the main body portion 410.

  The spacer 400 is formed of a heat-resistant or heat-insulating material such as polypropylene (PP), polyphenylene sulfide (PPS), polyethylene terephthalate (PET), ceramic, or an insulating material such as a composite material thereof. Has been.

  That is, the spacer 400 has an insulating function. Note that when a heat insulating material is used, the spacer 400 is further provided with a function of insulating the electrode body 141 and the electrode body 142.

  Two electrode bodies 141 and 142 are disposed on the spacer 400 having the above configuration, and are bound by an insulating film 143 from the outside. In the present embodiment, as shown in FIG. 6, the two electrode bodies 141 and 142 combined through the spacer 400 are wound with two insulating films 143. In addition, for example, two insulating tapes 144 are attached to each of the overlapping portions of the two insulating films 143 existing above and below. As a result, the electrode assembly bundle 500 including the two electrode bodies 141 and 142 combined through the spacer 400 is produced.

  As a result, the spacer 400 and the two electrode bodies 141 and 142 are in the positional relationship shown in FIGS. 7A and 7B.

  Hereinafter, the structural relationship between the spacer 400 and the two electrode bodies 141 and 142 included in the power storage device 10 according to the present embodiment will be described with reference to FIGS. 7A and 7B.

  In the present embodiment, the main body 410 of the spacer 400 is sandwiched between two electrode bodies 141 and 142 (see, for example, FIG. 7B). Thereby, the distance of the arrangement direction (1st direction, X-axis direction) of the two electrode bodies 141 and 142 can be controlled.

  As described above, the main function (basic function) of the spacer 400 is exhibited by the main body 410.

  The main body 410 can also function as a member that presses each of the two electrode bodies 141 and 142 against the inner surface of the container main body 111 facing the first direction (Y-axis direction). In this case, the effect of stabilizing the position of the two electrode bodies 141 and 142 in the container 100 can also be obtained.

  Further, a main body hole 412 is formed in the main body portion 410, and an electrolyte flow path that penetrates the main body portion 410 in the thickness direction is formed by the main body hole 412. Thereby, the effect of promoting penetration of the electrolytic solution into the two electrode bodies 141 and 142 is obtained.

  In addition, the first wall 420 abuts on the upper side surfaces (the side surface on the plus side in the third direction (Z-axis direction)) of the two electrode bodies 141 and 142 (see, for example, FIGS. 7A and 7B). Thereby, the movement of the two electrode bodies 141 and 142 in the third direction (Z-axis direction) is restricted. More specifically, the first wall portion 420 restricts the movement of the two electrode bodies 141 and 142 upward (Z-axis plus direction).

  In addition, since the first wall 420 abuts the upper surfaces of the two electrode bodies 141 and 142 at the surface, the axes of the two electrode bodies 141 and 142 are parallel to the first direction (Y-axis direction). Circumferential rotation (rotation in a plane (in the XZ plane) intersecting the first direction (Y-axis direction) or twisting between the electrode bodies 141 and 142) is also suppressed.

  As described above, when the two electrode bodies 141 and 142 are arranged so as to sandwich the main body portion 410 of the spacer 400, the two electrode bodies 141 and 142 are arranged in a relatively normal position and posture. In short, the electrode body 141 and the electrode body 142 having the same shape (including substantially the same shape) and the size of each other are viewed from the front (when viewed from the direction in which the two electrode bodies 141 and 142 are aligned). The spacers 400 are aligned so that the outer shapes overlap.

  In this state, the electrode bodies 141 and 142 are bound by one or more insulating films 143, and the electrode body bound object 500 is produced. That is, the spacer 400 can stabilize the positions and postures of the electrode bodies 141 and 142 when the electrode body bundle 500 is manufactured.

  For example, when the insulating film 143 is wound around the electrode bodies 141 and 142 arranged side by side, the relative displacement of the electrode bodies 141 and 142 is suppressed.

  Accordingly, in the electrode assembly bundle 500, the displacement of the positions of the positive electrode side and negative electrode side end portions (active material layer non-forming portions) of the electrode bodies 141 and 142 from the normal position is suppressed.

  Therefore, the two electrode bodies 141 and 142 combined through the spacer 400 in the electrode assembly bundle 500, and the positive electrode current collector 120 and the negative electrode current collector 130 are joined by welding or the like with high accuracy.

  Moreover, in this Embodiment, the 1st wall part 420 is isolate | separated into the 1st wall part 420a and the 1st wall part 420b, and the space where the spacer 400 does not exist is formed between these.

  This prevents the first wall 420 from becoming a resistance to exhaust from the safety valve 110c (see FIG. 3) of the lid 110. Further, the spacer 400 is prevented from interfering with the arrangement of the insulating film 143. Furthermore, interference between the spacer 400 and the caulked portion of the rivet portion 230 protruding from the lower surface of the terminal connection portion 121 of the positive electrode current collector 120 is prevented.

  The spacer 400 according to the present embodiment further includes a second wall portion 430 at the end of the main body portion 410 opposite to the first wall portion 420. Like the first wall 420, the second wall 430 is provided so as to form a surface that extends along the XY plane at the end of the main body 410. In the present embodiment, the two electrode bodies 141 are provided. And 142 are provided so as to contact from below.

  That is, in the present embodiment, the two electrode bodies 141 and 142 are sandwiched from both sides in the third direction (Z-axis direction) by the first wall portion 420 and the second wall portion 430 included in the spacer 400. As a result, the two electrode bodies 141 and 142 can be almost completely restrained in the third direction (Z-axis direction).

  As a result, position regulation in the third direction (Z-axis direction) with respect to the two electrode bodies 141 and 142 and suppression of rotation around the axis in the first direction (Y-axis direction) are more reliably performed.

  As shown in FIG. 7B, each of the first wall 420 and the second wall 430 has a center line in the thickness direction of the two electrode bodies 141 and 142 in the first direction (Y-axis direction) (see FIG. 7B). 7B is extended to the outer side.

  Thereby, each of the 1st wall part 420 and the 2nd wall part 430 correct | amends each position and attitude | position of the two electrode bodies 141 and 142 which an upper end and a lower end are comprised in a curved surface to a regular position and attitude | position. Can be maintained stably.

  In the present embodiment, a protrusion 450 is provided at the end of the main body 410. Specifically, as illustrated in FIG. 7B, a protrusion 450 is provided so as to fill between the end of the main body 410 where the second wall 430 is disposed and the electrode bodies 141 and 142.

  That is, the projecting portion 450 is formed in a shape along the outer shape of the lower end portions of the electrode bodies 141 and 142, so that a gap between the end portion of the main body portion 410 and the electrode bodies 141 and 142 is formed. Buried.

  Thus, by providing the protrusion part 450 in the spacer 400, the movement of the foreign material from one side of the positive electrode side and the negative electrode side in the two electrode bodies 141 and 142 is suppressed. As a result, for example, the occurrence of an internal short circuit due to the movement of the conductive foreign matter is suppressed.

  Next, the structural relationship between the spacer 400 and the current collector according to the present embodiment will be described with reference to FIGS.

  FIG. 8 is an exploded perspective view showing the positional relationship between the positive electrode current collector 120 and the spacer 400 according to the embodiment.

  FIG. 9 is a front view showing the positional relationship between the positive electrode current collector 120 and the spacer 400 according to the embodiment.

  In FIG. 8, in order to clearly show the positional relationship between the positive electrode current collector 120 and the spacer 400, the other elements are not shown. In FIG. 9, in order to clearly explain the effect of the spacer 400 supporting the positive electrode current collector 120, the illustration of the upper insulating member 240 and the lower insulating member 160 is omitted, and the positive electrode current collector 120 is , The area is marked with dots. Further, the cross section of the container 100 (the lid body 110 and the container body 111) is shown. These are the same in FIG. 11 described later.

  As shown in FIGS. 8 and 9, the spacer 400 is arranged in the electric storage element 10 so that the first wall 420 of the spacer 400 abuts the lower surface of the terminal connection part 121 of the positive electrode current collector 120. .

  That is, the electricity storage device 10 includes the positive electrode terminal 200 that is disposed on the opposite side of the two electrode bodies 141 and 142 across the first wall 420 and is connected to the positive electrode current collector 120. Further, the first wall portion 420 that contacts the two electrode bodies 141 and 142 further contacts the terminal connection portion 121 that is a portion of the positive electrode current collector 120 connected to the positive electrode terminal 200.

  Thus, the spacer 400 is disposed so as to support the terminal connection portion 121 from the inside of the power storage element 10. Thereby, the deformation of the positive electrode current collector 120 is suppressed.

  Specifically, for example, as shown in FIG. 9, a case where a relatively large load is applied to the terminal body 210 from above is assumed. In this case, since the terminal connecting portion 121 is fixed to the lid 110 by the rivet portion 230, the load is a direction in which the terminal connecting portion 121 is rotated about the position of the rivet portion 230 as an axis (axis in the Y-axis direction). Acts as a force. That is, the force applied to the terminal body 210 from above acts as a force for inclining the terminal connection portion 121 inward in FIG.

  However, since the first wall portion 420 of the spacer 400 positioned below the terminal connection portion 121 is in contact with the terminal connection portion 121, the inward inclination of the terminal connection portion 121 is suppressed.

  Here, if the terminal connection part 121 is inclined inward, the electrode body connection part 122 and the electrode bodies 141 and 142 are peeled off, and the end of the electrode body connection part 122 is in the direction of the two electrode bodies 141 and 142. It may be suitable for In this case, the two electrode bodies 141 and 142 may be damaged by the electrode body connecting portion 122. However, as described above, since the first wall portion 420 of the spacer 400 suppresses the inward tilt of the terminal connection portion 121, the electrode body connection portion 122 may damage the electrode bodies 141 and 142. It is suppressed.

  Further, as shown in FIG. 8, in the present embodiment, an insulating convex portion 150c penetrating through the opening 120b (see FIG. 4) protrudes from the lower surface of the terminal connecting portion 121 of the positive electrode current collector 120. ing.

  The insulating convex portion 150c is a portion located on the back side of the lower concave portion 150b, which is generated by forming the lower concave portion 150b of the lower insulating member 150, and is a portion located below the terminal body 210 (see FIG. 3).

  In the present embodiment, a convex portion that corresponds to such a concave-convex shape on the lower surface side of the terminal connection portion 121 and that abuts the terminal connection portion 121 on the surface of the first wall portion 420 of the spacer 400 on the terminal connection portion 121 side. 421.

  Specifically, as shown in FIG. 8, the first wall portion 420 is provided with two convex portions 421 at a predetermined interval. Thereby, the 1st wall part 420 can be contact | abutted to the terminal connection part 121 avoiding the insulation convex part 150c. That is, when the first wall 420 has the convex portion 421, the support of the terminal connection portion 121 by the spacer 400 is stabilized when the lower surface of the terminal connection portion 121 is uneven.

  In the present embodiment, as shown in FIG. 9, the spacer 400 has an end portion (the second wall portion 430 in the present embodiment) opposite to the first wall portion 420, which is the inner surface 111 a ( It arrange | positions in the state contact | abutted in the surface inside the container 100 in the position which opposes an electrode terminal.

  Therefore, the spacer 400 also functions as a tension member between the terminal connection part 121 and the inner surface 111a of the container 100. Thereby, suppression of the deformation | transformation of the positive electrode electrical power collector 120 is ensured more, for example. That is, the possibility of occurrence of a situation such as damage to the electrode body 141 or 142 due to the deformation of the positive electrode current collector 120 is further reduced.

  In the above description, the structure on the positive electrode side (positional relationship between the spacer 400 and the positive electrode current collector 120, etc.) in the power storage element 10 has been described, but the structure on the negative electrode side is also the same. That is, the terminal connection portion 131 of the negative electrode current collector 130 is supported from the inside of the power storage element 10 by the first wall portion 420 of the spacer 400.

  As described above, the electricity storage device 10 according to the present embodiment includes the spacer 400, and the spacer 400 includes the main body 410 disposed between the two electrode bodies 141 and 142 and the end of the main body 410. At least one wall portion (in the present embodiment, the first wall portion 420 and the second wall portion 430).

  As a result, the relative positions and postures of the two electrode bodies 141 and 142 can be regulated to regular positions and postures, and while maintaining this state, the positive electrode current collector 120 and the negative electrode current collector 130 The two electrode bodies 141 and 142 can be joined (welded or the like). As a result, the joining is performed with high accuracy.

  Further, even after the storage element 10 is completed, the restriction on the position and posture of the two electrode bodies 141 and 142 by the spacer 400 continues. Therefore, for example, when vibration or impact is applied when the power storage device 10 is used, displacement of the electrode bodies 141 and 142 due to vibration or impact is suppressed.

  Therefore, for example, the deformation of the positive electrode current collector 120 and the negative electrode current collector 130 due to the displacement of one position of the electrode bodies 141 and 142 in the electric storage element 10 is suppressed. As a result, damage to the electrode body 141 or the electrode body 142 due to deformation of the positive electrode current collector 120 or the negative electrode current collector 130 is suppressed.

  That is, the spacer 400 not only plays a role of aligning the two electrode bodies 141 and 142 in a normal position and posture at the time of manufacturing the power storage element 10, but also after the power storage element 10 is completed, the spacer 400 has vibration resistance and resistance. It can also play a role in improving impact properties.

  Note that the power storage element 10 may include a spacer having a shape or structure different from the shape or structure of the spacer 400 illustrated in FIGS. Therefore, in the following, various modified examples related to the spacer 400 included in the power storage element 10 will be described focusing on differences from the above embodiment.

(Modification 1)
FIG. 10 is a perspective view showing a characteristic part of the spacer 401 according to the first modification of the embodiment.

  FIG. 11 is a front view showing a positional relationship between the positive electrode current collector 120 and the spacer 401 according to the first modification of the embodiment.

  As shown in FIG. 10, the spacer 401 according to Modification 1 is characterized in that it has a current collector contact portion 460. Note that the configuration of the spacer 401 other than the current collector contact portion 460 is the same as that of the spacer 400 (see, for example, FIG. 5) according to the embodiment.

  Specifically, in the present modification, the main body portion 410 of the spacer 401 is disposed on the main body portion 410 side of at least one of the electrode body connecting portions 122a to 122d (see FIG. 4). A current collector abutting portion 460 is provided. In other words, the current collector abutting portion 460 is disposed on the main body portion 410 side of the electrode body connecting portion so as to be able to abut on the end surface.

  That is, as shown in FIG. 11, the current collector contact portion 460 is disposed so as to support at least a part of the electrode body connection portion 122 from the inside (the main body portion 410 side of the spacer 400).

  In the present modification, the current collector contact portion 460 includes the electrode body connection portions 122b and 122c of the main body portion 410 of the two electrode body connection portions 122b and 122c that are close to the main body portion 410 of the spacer 401 among the four electrode body connection portions 122a to 122d. It abuts on the side end face.

  Thereby, for example, when the positive electrode current collector 120 is deformed, the inward movement of the electrode body connecting portions 122b and 122c is suppressed.

  Further, in this modified example, as in the above embodiment, the first wall 420 of the spacer 401 is in contact with the terminal connection portion 121 of the positive electrode current collector 120. The effect of suppressing deformation of the positive electrode current collector 120 by the one wall portion 420 is also exhibited.

  That is, in the spacer 401 according to this modification, the deformation of the positive electrode current collector 120 is suppressed by the first wall portion 420 and the current collector abutting portion 460, thereby causing the deformation of the positive electrode current collector 120. Generation | occurrence | production of damage etc. of the two electrode bodies 141 and 142 is suppressed.

(Modification 2)
FIG. 12 is a perspective view illustrating a configuration of a spacer 402 according to the second modification of the embodiment.

  As shown in FIG. 12, the spacer 402 according to the modified example 2 is disposed at the end of the main body 410a and the main body 410a in the third direction (Z-axis direction), and in the first direction (Y-axis direction) and A first wall 420c extending in the second direction (X-axis direction).

  The main body portion 410a is a portion disposed between the two electrode bodies 141 and 142, and the distance between the two electrode bodies 141 and 142 is controlled similarly to the main body portion 410 of the spacer 400 according to the embodiment. Have a role.

  The first wall 420c is provided so as to form a surface extending along the XY plane at the upper end of the main body 410a (the end in the third direction (Z-axis direction) plus side). It contacts the electrode bodies 141 and 142 from above.

  Here, in this modification, the main body 410a does not have the main body hole 412 and the protrusion 450 (see FIG. 5) included in the main body 410 according to the embodiment, and has a flat plate shape as a whole. Further, unlike the first wall portion 420 according to the embodiment, the first wall portion 420c is not separated into a positive electrode side portion and a negative electrode side portion, and a spacer is formed as one flat plate portion. 402 is provided.

  As described above, the spacer 402 according to the present modification is a member that is arranged so that two flat portions intersect as a whole, and has a simple shape as compared with the spacer 400 according to the embodiment. Yes.

  However, the spacer 402 has the first wall portion 420c disposed at the end of the main body portion 410a, so that it is above the two electrode bodies 141 and 142 (in the third direction (Z-axis direction) plus side). Movement to is regulated.

  Further, since the first wall 420c abuts the upper surfaces of the two electrode bodies 141 and 142 at the surface, the axes of the two electrode bodies 141 and 142 are parallel to the first direction (Y-axis direction). Is also suppressed (twist between the electrode bodies 141 and 142).

  Therefore, the spacer 402 according to the present modification can play a role of aligning the two electrode bodies 141 and 142 in a normal position and posture at the time of manufacturing the power storage element 10. The spacer 402 can also play a role of improving the vibration resistance and impact resistance of the power storage element 10 after the power storage element 10 is completed.

  In addition, since the spacer 402 has a simple shape, for example, the spacer 402 is easier to manufacture than the spacer 400 according to the embodiment.

  Note that the two electrode bodies 141 and 142 may be arranged with respect to the spacer 402 by turning the spacer 402 upside down.

  That is, the spacer 402 and the two electrode bodies 141 and 142 may be combined so that the first wall portion 420c contacts the lower side surface of the two electrode bodies 141 and 142. Even in this case, the movement of the two electrode bodies 141 and 142 in the third direction (specifically, movement to the negative side in the Z-axis direction) is restricted. Further, the rotation of each of the two electrode bodies 141 and 142 around the axis parallel to the first direction (Y-axis direction) (twist between the electrode bodies 141 and 142) is also suppressed.

  Note that the first wall portion 420c may abut the terminal connection portion 121 of the positive electrode current collector 120, for example. In this case, deformation of the positive electrode current collector 120 (terminal connection portion 121) is suppressed, and an effect of suppressing damage to the two electrode bodies 141 and 142 is also exhibited.

  Further, the spacer 402 may be disposed in a state where the lower end portion of the main body portion 410a is in contact with the inner surface 111a (see FIG. 9) of the container 100. In this case, for example, the deformation of the positive electrode current collector 120 is suppressed. More certainty.

(Modification 3)
FIG. 13 is a perspective view illustrating a configuration of a spacer 403 according to the third modification of the embodiment.

  As shown in FIG. 13, the spacer 403 according to Modification 3 is disposed at the end of the main body 410a and the main body 410a in the third direction (Z-axis direction), and in the first direction (Y-axis direction) and A first wall 420c extending in the second direction (X-axis direction).

  The spacer 403 further includes a second wall portion 430a disposed at an end portion of the main body portion 410a opposite to the first wall portion 420c. Similar to the first wall 420c, the second wall 430a is provided so as to form a surface extending along the XY plane at the end of the main body 410a.

  That is, the spacer 403 according to the present modification has a configuration in which the second wall portion 430a is added to the spacer 402 according to the second modification.

  According to this configuration, the two electrode bodies 141 and 142 are sandwiched from both sides in the third direction (Z-axis direction) by the first wall portion 420c and the second wall portion 430a included in the spacer 402. As a result, position regulation in the third direction (Z-axis direction) with respect to the two electrode bodies 141 and 142 and suppression of rotation around the axis in the first direction (Y-axis direction) are more reliably performed.

  The spacer 403 has a simple shape as compared with the spacer 400 according to the embodiment. Therefore, in addition to the effect of regulating the position and posture with respect to the two electrode bodies 141 and 142 described above, for example, there is an advantage that the manufacturing is easy as compared with the spacer 400 according to the embodiment.

  The first wall 420c may be brought into contact with the terminal connecting portion 121 of the positive electrode current collector 120, and the lower end of the main body 410a (second wall 430a in this modification) The inner surface 111a may be brought into contact with the inner surface 111a, and these effects are the same as in the second modification.

(Other)
As described above, the power storage device according to the present invention has been described based on the embodiment and the modifications thereof. However, the present invention is not limited to the embodiment and its modifications. Without departing from the spirit of the present invention, various modifications conceived by those skilled in the art may be applied to the embodiment or its modifications, or a structure constructed by combining a plurality of the above-described constituent elements may be applied to the present invention. It is included in the range.

  For example, the spacer 400 may be a metal-based spacer as long as it can insulate the positive electrode current collector 120 and the negative electrode current collector 130 from the container 100. For example, the spacer 400 may be a spacer obtained by coating a metal base material with a resin.

  Moreover, the electrical storage element 10 may be provided with three or more electrode bodies, and the edge part of three or more electrode bodies may be joined to one current collector. In this case, for example, the main body portion of the spacer may be disposed between each of the two adjacent electrode bodies, and the wall portion may be disposed so as to connect the upper end portion or the lower end portion of these main body portions. .

  By using the spacer for the electric storage element 10 including three or more electrode bodies, for example, at the time of manufacturing the electric storage element 10, the three or more electrode bodies can be aligned so as to have a normal position and posture.

  Further, the two electrode bodies 141 and 142 combined through the spacers 400, 401, 402, or 403 (such as the spacer 400) do not need to be bound by the insulating film 143, and one or three or more sheets are used. The insulating film 143 may be bundled.

  Further, the size of the spacer 400 or the like is not limited to a predetermined size. For example, in the present embodiment, the spacer 400 has a size close to the size of the electrode bodies 141 and 142 in a front view (see FIG. 6). However, for example, the length of the spacer 400 in the second direction (X-axis direction) may be shorter than the length shown in FIG.

  Further, in the case of a spacer having a wall portion only at one end in the third direction (Z-axis direction) of the main body portion, such as the spacer 402 according to Modification 2, the length of the spacer in the third direction (Z-axis direction) is For example, it may be about half the length of the electrode bodies 141 and 142 in the third direction (Z-axis direction).

  In any case, the spacer includes a main body portion disposed between the two electrode bodies 141 and 142 and a wall portion disposed at an end portion in the third direction (Z-axis direction) of the main body portion. By having it, it is possible to regulate the positions and postures of the two electrode bodies 141 and 142.

  Further, the position, size, and number of the body holes 412 formed in the body portion 410 are not limited to the position, size, and number shown in FIG. For example, a plurality of main body holes 412 may be formed in the main body portion 410. Thereby, the effect of promoting the penetration of the electrolyte into the two electrode bodies 141 and 142 can be improved.

  Further, “first” and “second” in the first wall portion (420, 420a to 420c) and the second wall portion (430, 430a) distinguish two wall portions arranged to face each other in the spacer 400. It is a character string attached to That is, the position of the wall portion in the electric storage element 10 is not limited by “first” and “second”. For example, in the spacer 400, a wall portion disposed at the lower end portion (end portion on the minus side in the Z-axis direction) of the main body portion 410 may be referred to as a “first wall portion”.

  The present invention is applicable to power storage elements such as lithium ion secondary batteries.

DESCRIPTION OF SYMBOLS 10 Power storage element 100 Container 110 Cover body 110a, 110b, 120a, 130a, 150a, 160a Through hole 110c Safety valve 110d, 110e Cover body recessed part 111 Container main body 111a Inner surface 120 Positive electrode collector 120b, 130b Opening part 121, 131 Terminal connection part 122, 122a, 122b, 122c, 122d Electrode body connecting part 130 Negative electrode current collector 141, 142 Electrode body 141a, 142a End part 143 Insulating film 144 Insulating tape 150, 160 Lower insulating member 150b, 160b Lower concave part 150c Insulating convex part 200 Positive electrode terminal 210, 310 Terminal body 220, 320 Connection portion 230, 330 Rivet portion 240, 340 Upper insulating member 241, 341 Recess for terminal 300 Negative electrode terminal 400, 401, 402, 403 Spacer 4 0,410a main body 412 body holes 420,420a, 420b, 420c first wall portion 421 protrusion 430,430a second wall portion 450 protruding portion 460 current collector contact portion 500 electrode body tying product

Claims (7)

A power storage device comprising two or more electrode bodies arranged in a first direction,
A current collector connected to an end of a second direction intersecting the first direction of two of the two or more electrode bodies;
A spacer partially disposed between the two electrode bodies,
The spacer includes a main body disposed between the two electrode bodies;
A first wall portion disposed at an end portion of the main body portion in a third direction intersecting the first direction and the second direction, and extending in the first direction and the second direction, A power storage element comprising: a first wall portion positioned on a side surface in the third direction of each of two electrode bodies. The spacer further includes
The power storage device according to claim 1, further comprising a second wall portion disposed at an end portion of the main body portion opposite to the first wall portion and extending in the first direction and the second direction. Furthermore, an electrode terminal is provided,
The current collector has an electrode body connection portion connected to an end portion of the electrode body in the second direction, and a terminal connection portion connected to the electrode terminal,
The power storage element according to claim 1, wherein the first wall portion is in contact with the terminal connection portion of the current collector. The power storage device according to claim 3, wherein the first wall portion has a convex portion that abuts on the terminal connection portion on a surface on the terminal connection portion side. And a container for accommodating the two or more electrode bodies,
The power storage device according to claim 3 or 4, wherein the spacer is disposed in a state in which an end opposite to the first wall is in contact with an inner surface of the container. The current collector has a plurality of electrode body connection portions connected to the end portions in the second direction of the two electrode bodies,
The said main-body part of the said spacer has a collector contact part located in the said main-body part side of the at least 1 electrode-body connection part of these electrode body connection parts. The electrical storage element of Claim 1. The spacer further fills a gap between at least one of the two electrode bodies and an end of the main body where the first wall is disposed or an end opposite to the first wall. The power storage device according to claim 1, wherein the power storage device has a protruding portion provided as described above.

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