JP6237849B2 - Power storage device and method for manufacturing power storage device - Google Patents

Description

  The present invention relates to an energy storage device including an electrode body having a positive electrode and a negative electrode, an insulating material that insulates the electrode body and the container, and a spacer disposed in the container, and a method for manufacturing the energy storage element.

  The shift from gasoline cars to electric cars has become important as a global environmental problem. For this reason, development of an electric vehicle using a power storage element such as a lithium ion secondary battery as a power source is being promoted.

  Here, the power storage element accommodates an electrode body having a positive electrode and a negative electrode in a container. However, since a space is generated between the electrode body and the container, an extra electrolyte is required by the space. Or cause the electrode body to swing in the container. For this reason, conventionally, with respect to such an electric storage element, a battery has been proposed that can reduce the space between the electrode body and the container by providing a spacer between the electrode body and the container (for example, , See Patent Document 1).

JP 2006-40899 A

  However, in the above conventional power storage element, it is necessary to insert a spacer in addition to the electrode body into the container at the time of manufacturing the power storage element, so that the process of inserting into the container becomes complicated. Moreover, even if the spacer is inserted into the container, the position of the spacer in the container may be shifted.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a power storage device that can smoothly insert a spacer into a container while reducing the displacement of the spacer in the container. And

  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 an electrode body having a positive electrode and a negative electrode, and a container for housing the electrode body, and is disposed in the container. And an insulating material that insulates the electrode body and the container, and a spacer disposed in the container, wherein the spacer is disposed between the insulating material and the electrode body.

  According to this, the electric storage element has a configuration in which the spacer is disposed between the insulating material and the electrode body. That is, the spacer is fixed to the electrode body while being sandwiched between the insulating material and the electrode body. And the electrical storage element is comprised by the said spacer being inserted in a container in the state fixed between the insulating material and the electrode body. Thus, since the spacer is fixed to the electrode body with the insulating material and inserted into the container, the spacer can be smoothly inserted into the container while reducing the displacement of the spacer in the container.

  Preferably, the spacer is configured to reduce a space between the electrode body and the container and to prevent the electrode body from moving in the container.

  According to this, the spacer having a relatively large volume arranged along the bottom surface and the side surface of the container is fixed to the electrode body while being sandwiched between the insulating material and the electrode body. Then, the spacer is inserted into the container in a state where the relative position between the electrode body and the spacer is fixed by the insulating material. For this reason, even if the spacer is a bottom spacer that is inserted into the container before the electrode body and is disposed along the bottom surface of the container, the positional deviation of the bottom spacer in the container can be reduced.

  Preferably, the insulating material is disposed so as to cover the spacer and the electrode body.

  According to this, the electrical storage element has the structure arrange | positioned so that an insulating material may cover an electrode body and a spacer. That is, the electrode body and the spacer are fixed so that the insulating material wraps the electrode body and the spacer. For this reason, since the spacer is covered with an insulating material, fixed to the electrode body, and inserted into the container, the spacer can be smoothly inserted into the container while reducing the displacement of the spacer in the container. .

  Preferably, the insulating material is a sheet-like member.

  According to this, since the insulating material is a sheet-like member, the spacer can be easily wrapped and fixed to the electrode body.

  Preferably, the insulating material is bonded or welded to the spacer.

  According to this, the position shift of the spacer in a container can be reduced effectively.

  Preferably, the spacer has an inner surface portion facing the electrode body and two side surface portions disposed on both sides of the inner surface portion, and at least one of the two side surface portions; The inner surface portion is connected by a curved surface.

  According to this, the at least 1 side part and inner surface part of the spacer are connected by the curved surface. That is, the spacer has a configuration in which a tip portion that contacts the electrode body when it is fixed to the electrode body is rounded. Thereby, when the said spacer is fixed to an electrode body, it can prevent damaging an electrode body with the front-end | tip of a spacer.

  Preferably, the spacer is disposed between an inner surface facing the electrode body, two side surfaces disposed on both sides of the inner surface, and the two side surfaces facing the insulating material. And at least one of the two side surfaces and the outer surface are connected by a curved surface.

  According to this, at least one side surface portion of the spacer and the outer surface portion are connected by a curved surface. That is, the spacer has a configuration in which corners that come into contact with the insulating material are rounded. Thereby, even when the spacer and the insulating material are rubbed due to vibration or the like, it is possible to prevent the insulating material from being damaged at the corners of the spacer.

  Preferably, the spacer is an insulating member.

  According to this, since the spacer is an insulating member, for example, even when the insulating material is damaged when the spacer is wrapped with the insulating material and fixed to the electrode body, the electrode body and the container It is possible to ensure insulation between the two.

  Preferably, the electrode body includes a coating region in which an active material is coated on surfaces of the positive electrode and the negative electrode, and an uncoated material in which an active material is not coated on the surfaces of the positive electrode and the negative electrode. The spacer has a first portion facing the uncoated region and a second portion facing the coated region, and the thickness of the first portion is greater than that of the second portion. Thicker than thickness.

  According to this, the thickness of the 1st part which opposes the non-application area | region of the active material of a spacer is thicker than the thickness of the 2nd part which opposes the application area | region of the active material of a spacer. Here, the uncoated region is a region that is unlikely to cause a decrease in performance of the power storage element even when pressed. In this power storage element, the thickness of the first part of the spacer facing the uncoated area is made thicker than the second part in order to increase the vibration resistance, and the uncoated area is pressed. The vibration resistance can be improved without significantly reducing. In addition, the coating region is a region that easily swells due to repeated charge and discharge, and is a region in which the performance of the power storage element is likely to deteriorate when excessively compressed. For this reason, by making the thickness of the second part of the spacer thinner than the thickness of the first part, it is possible to provide a space that can allow the electrode body to bulge, and even if the electrode body expands, the performance of the electricity storage device is degraded. Can be prevented.

  Preferably, the gap between the second portion of the spacer and the coated region of the electrode body is larger than the gap between the first portion of the spacer and the uncoated region of the electrode body. .

  According to this, the spacer is formed so that the clearance (clearance) from the position facing the coating area of the electrode body is larger than the clearance from the position facing the uncoated area of the electrode body. For this reason, even if the coating area expands due to repeated charging and discharging, the clearance of the position facing the coating area is large, so that the coating area of the electrode body can be allowed to expand. In addition, since the electrode body has a small clearance in an uncoated region in which the performance degradation of the electricity storage element is unlikely to occur due to the pressure, the vibration resistance can be improved in a state that does not cause the performance degradation of the electricity storage device. .

  Preferably, in the spacer, the shape of the first portion on the electrode body side is a shape along the outer surface of the electrode body.

  According to this, since the shape on the electrode body side of the first portion of the spacer is a shape along the electrode body, a gap (clearance) at a position corresponding to the first portion can be minimized. For this reason, the spacer can further improve the vibration resistance in the first portion.

  Preferably, the spacer includes the two first parts disposed at both ends in the longitudinal direction and the two second parts connected to the two first parts, and the two second parts. Between the two parts, there is a third part that is thinner than the two second parts.

  According to this, the spacer has a third portion that is thinner than the second portion between the two second portions. In other words, since the spacer can support the electrode body between the first part and the second part, the thickness of the third part between the two second parts that are not used for supporting the electrode body is reduced. Cost reduction can be achieved by reducing the material.

  In order to achieve the above object, a method for manufacturing a power storage element according to one embodiment of the present invention includes an electrode body having a positive electrode and a negative electrode, a container that houses the electrode body, and a container that is disposed in the container. An electrical storage element manufacturing method comprising: an insulating material that insulates an electrode body from the container; and a spacer disposed in the container, wherein the spacer is disposed between the insulating material and the electrode body. An arrangement step, and an insertion step of inserting the spacer into the container together with the insulating material and the electrode body.

  According to this, the spacer is disposed between the insulating material and the electrode body. That is, the spacer is fixed to the electrode body while being sandwiched between the insulating material and the electrode body. And the electrical storage element is comprised by the said spacer being inserted in a container in the state fixed between the insulating material and the electrode body. Thus, since the spacer is fixed to the electrode body with the insulating material and inserted into the container, the spacer can be smoothly inserted into the container while reducing the displacement of the spacer in the container.

  Preferably, in the arranging step, the spacer is arranged between the insulating material and the electrode body so as to cover the spacer and the electrode body with the insulating material.

  According to this, a spacer is arrange | positioned between an insulating material and an electrode body so that an insulating material may cover an electrode body and a spacer. That is, the electrode body and the spacer are fixed so that the insulating material wraps the electrode body and the spacer. For this reason, since the spacer is covered with an insulating material, fixed to the electrode body, and inserted into the container, the spacer can be smoothly inserted into the container while reducing the displacement of the spacer in the container. .

  Preferably, in the arranging step, the spacer is placed on the insulating material, and the positive electrode and the negative electrode having a long band shape are wound and wound in an oval shape around a winding axis. The spacer is placed between the insulating material and the electrode body by placing the rotated electrode body horizontally and winding the insulating material around the electrode body.

  According to this, manufacturing efficiency can be improved.

  According to the present invention, the spacer can be smoothly inserted into the container while reducing the positional deviation of the spacer in the container during the manufacturing process of the electric storage element.

It is a perspective view which shows typically the external appearance of the electrical storage element which concerns on embodiment of this invention. It is a disassembled perspective view except the container of the electrical storage element which concerns on embodiment of this invention. It is a figure which shows that the bottom face spacer and electrode body which concern on embodiment of this invention are inserted in a container in the state covered with the insulating material. It is a figure which shows the positional relationship of the electrode body and bottom surface spacer in the inside of the electrical storage element which concerns on embodiment of this invention. It is a figure which shows the structure of the bottom face spacer which concerns on embodiment of this invention. It is a figure which shows the structure of the bottom face spacer which concerns on embodiment of this invention. It is a flowchart which shows an example of the manufacturing method of the electrical storage element which concerns on embodiment of this invention. It is a figure for demonstrating the manufacturing method of the electrical storage element which concerns on embodiment of this invention. It is a figure for demonstrating the manufacturing method of the electrical storage element which concerns on embodiment of this invention. It is a figure for demonstrating the manufacturing method of the electrical storage element which concerns on embodiment of this invention. It is a figure which shows the structure of the electrical storage element which concerns on the modification 1 of embodiment of this invention. It is a figure which shows the structure of the electrical storage element which concerns on the modification 2 of embodiment of this invention. It is a figure which shows the structure of the electrical storage element which concerns on the modification 2 of embodiment of this invention. It is a figure which shows the structure of the electrical storage element which concerns on the modification 2 of embodiment of this invention. It is a figure which shows the structure of the bottom face spacer with which the electrical storage element which concerns on the modification 3 of embodiment of this invention is provided. It is a figure for demonstrating the bottom surface spacer with which the electrical storage element which concerns on the modification 4 of embodiment of this invention is provided. It is a figure for demonstrating the bottom surface spacer with which the electrical storage element which concerns on the modification 4 of embodiment of this invention is provided. It is a figure for demonstrating the bottom surface spacer with which the electrical storage element which concerns on the modification 4 of embodiment of this invention is provided. It is a figure for demonstrating the spacer with which the electrical storage element which concerns on the modification 5 of embodiment of this invention is provided.

  Hereinafter, a power storage device and a method for manufacturing a power 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 preferred specific example of the present invention. The numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, the steps in the manufacturing method, the order of the steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Absent. The invention is specified by the claims. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept of the present invention are not necessarily required to achieve the object of the present invention. It will be described as constituting a preferred form.

  First, the configuration of the power 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 an exploded perspective view excluding the container 100 of the electricity storage device 10 according to the embodiment of the present invention. That is, FIG. 2 is a diagram illustrating components disposed inside the container 100 of the power storage element 10.

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

  As shown in these drawings, the electricity storage device 10 includes a container 100, a lid plate 110 provided above the container 100, a positive electrode terminal 200, and a negative electrode terminal 300. In addition, an electrode body 120, a positive electrode current collector 130, a negative electrode current collector 140, side spacers 150 and 160, a bottom spacer 170, and an insulating material 180 are disposed inside the container 100.

  Note that a liquid such as an electrolytic solution is sealed inside the container 100 of the power storage element 10, but the liquid is not shown. Moreover, the electrical storage element 10 is not limited to a non-aqueous electrolyte battery, and may be a secondary battery other than the non-aqueous electrolyte battery or a capacitor.

  The container 100 is a container body having a rectangular cylindrical shape made of metal and having a bottom, and an opening of the container body is closed by a metal lid plate 110. In other words, the container 100 can be hermetically sealed by being welded with the lid plate 110 after the electrode body 120 and the like are accommodated therein. In the present embodiment, the surface opposite to the opening of the container 100 is defined as the bottom surface of the container 100.

  Although detailed illustration is omitted, the electrode body 120 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 the surface of a long belt-like positive electrode substrate made of aluminum foil. The negative electrode is obtained by forming a negative electrode active material layer on the surface of a long strip-shaped negative electrode substrate made of copper foil. The separator is a microporous sheet made of resin. The electrode body 120 is formed by winding a layered arrangement so that a separator is sandwiched between a negative electrode and a positive electrode so that the whole becomes an oval shape.

  More specifically, the positive electrode and the negative electrode are wound in an oval shape around the winding axis along the width direction while being shifted from each other in the width direction of the long band via the separator. And the said positive electrode and the said negative electrode are the positive electrode base materials in which the active material is not formed in the one end part of the winding axis | shaft by making the edge part of each shift direction into the non-formation part of an active material The aluminum foil is exposed, and the copper foil, which is a negative electrode base material on which no active material is formed, is exposed at the other end of the winding shaft. Further, a positive electrode current collector 130 and a negative electrode current collector 140 are disposed at both ends in the winding axis direction of the electrode body 120 so as to extend in a direction perpendicular to the winding axis direction.

  In addition, the electrode body 120 is formed with a flat surface portion in which the positive electrode, the negative electrode, and the separator are stacked in a plane, and a curved surface portion in which the electrode body 120 is stacked in a curved surface. The electrode body 120 is accommodated in the container 100 so that the curved surface portion faces the bottom surface of the container 100.

Here, as the positive electrode active material, polyanion compounds such as LiMPO ₄ , LiMSiO ₄ , LiMBO ₃ (M is one or more transition metal elements selected from Fe, Ni, Mn, Co, etc.), titanic acid, etc. Use of spinel compounds such as lithium and lithium manganate, lithium transition metal oxides such as LiMO ₂ (M is one or more transition metal elements selected from Fe, Ni, Mn, Co, etc.), etc. it can.

Moreover, as a negative electrode active material, if a negative electrode active material which can occlude / release lithium ion, a well-known material can be used suitably. For example, lithium is occluded in addition to lithium metal and lithium alloys (lithium-containing alloys such as lithium-silicon, lithium-aluminum, lithium-lead, lithium-tin, lithium-aluminum-tin, lithium-gallium, and wood alloys). Releasable alloys, carbon materials (eg, graphite, non-graphitizable carbon, graphitizable carbon, low-temperature calcined carbon, amorphous carbon, etc.), silicon oxide, metal oxide, lithium metal oxide (Li ₄ Ti ₅ O ₁₂ ) and polyphosphoric acid compounds.

  In addition, in the same figure, although the ellipse shape was shown as a shape of the electrode body 120, circular shape or elliptical shape may be sufficient.

  The positive electrode terminal 200 is an electrode terminal electrically connected to the positive electrode of the electrode body 120, and the negative electrode terminal 300 is an electrode terminal electrically connected to the negative electrode of the electrode body 120. That is, the positive electrode terminal 200 and the negative electrode terminal 300 lead the electricity stored in the electrode body 120 to the external space of the power storage element 10, and in order to store the electricity in the electrode body 120, It is an electrode terminal made of metal for introducing. The positive electrode terminal 200 and the negative electrode terminal 300 are attached to a lid plate 110 disposed above the electrode body 120.

  The positive electrode current collector 130 is disposed between the positive electrode of the electrode body 120 and the side wall of the container 100, and is a member having conductivity and rigidity that is electrically connected to the positive electrode terminal 200 and the positive electrode of the electrode body 120. It is. The positive electrode current collector 130 is made of aluminum, like the positive electrode of the electrode body 120.

  The negative electrode current collector 140 is a member that is disposed between the negative electrode of the electrode body 120 and the side wall of the container 100 and has electrical conductivity and rigidity that are electrically connected to the negative electrode terminal 300 and the negative electrode of the electrode body 120. It is. The negative electrode current collector 140 is made of copper, like the negative electrode of the electrode body 120.

  The side spacers 150 and 160 and the bottom spacer 170 are spacers configured to reduce a space between the electrode body 120 and the container 100 and to prevent the electrode body 120 from moving in the container 100.

  Specifically, the side spacers 150 and 160 are disposed between the positive electrode current collector 130 and the negative electrode current collector 140 and the side wall of the container 100 and extend along the positive electrode current collector 130 and the negative electrode current collector 140. It is a long insulating member. For example, the side spacers 150 and 160 are a resin such as polypropylene (PP). That is, the side spacers 150 and 160 insulate the positive electrode current collector 130 and the negative electrode current collector 140 from the container 100. Further, the side spacers 150 and 160 fill the space between the positive electrode current collector 130 and the negative electrode current collector 140 and the container 100, so that the electrode body 120 is interposed via the positive electrode current collector 130 and the negative electrode current collector 140. Supports the container 100 so as not to vibrate.

  The bottom surface spacer 170 is a long insulating member that is disposed between the electrode body 120 and the bottom surface of the container 100 and extends along the winding axis direction of the electrode body 120. For example, the bottom spacer 170 is a resin such as polypropylene (PP). More specifically, the bottom spacer 170 is disposed between the bottom surface of the container 100 and the curved surface portion of the electrode body 120. That is, the bottom spacer 170 insulates the electrode body 120 from the container 100. Further, the bottom spacer 170 supports the electrode body 120 so as not to vibrate with respect to the container 100 by filling a space between the electrode body 120 and the container 100. The detailed configuration of the bottom spacer 170 will be described later.

  The insulating material 180 is an insulating material that insulates the electrode body 120 from the container 100. Specifically, the insulating material 180 is a sheet-like member having insulating properties, and is disposed so as to cover the bottom surface spacer 170 and the electrode body 120. That is, the insulating material 180 is shaped like a bag, and from below the bottom surface spacer 170, the bottom surface spacer 170, the side surface spacers 150 and 160, the positive electrode current collector 130, and the negative electrode current collector 140 And enveloping the side surface of the electrode body 120. Accordingly, the bottom spacer 170 and the side spacers 150 and 160 are disposed between the insulating material 180 and the electrode body 120.

  As described above, the insulating material 180 is shaped and shaped so as to enclose the bottom spacer 170, the side spacers 150 and 160, and the electrode body 120. The insulating material 180 does not have to wrap all of the electrode body 120, and may be formed so as to cover only a part of the electrode body 120. The insulating material 180 may have any shape as long as it can be formed into a bag shape.

  FIG. 3 is a diagram illustrating that the bottom spacer 170 and the electrode body 120 according to the embodiment of the present invention are inserted into the container 100 while being covered with the insulating material 180.

  As shown in the figure, the insulating material 180 wraps the bottom spacer 170, the side spacers 150 and 160, the positive electrode current collector 130, the negative electrode current collector 140, and the electrode body 120 from below the bottom surface spacer 170. Cover like so. Then, the aggregate covered with the insulating material 180 is inserted into the container 100.

  Next, a detailed configuration of the bottom spacer 170 will be described.

  FIG. 4 is a diagram showing a positional relationship between the electrode body 120 and the bottom spacer 170 inside the energy storage device 10 according to the embodiment of the present invention. In the drawing, the positive electrode current collector 130, the negative electrode current collector 140, the side spacers 150 and 160, and the insulating material 180 are omitted.

  5A and 5B are diagrams showing the configuration of the bottom spacer 170 according to the embodiment of the present invention. Specifically, FIG. 5A is an external perspective view of the bottom spacer 170 viewed from an oblique direction, and FIG. 5B is a diagram of the bottom spacer 170 shown in FIG. 5A viewed from the lower left side of the same figure.

  First, as shown in FIG. 4, the electrode body 120 is provided with uncoated areas A1, which are areas where the active material is not applied to each of the positive electrode and the negative electrode, at both ends in the winding axis direction. A coating region A2, which is a region where the active material is coated on the positive electrode and the negative electrode, is provided at the center in the winding axis direction of the electrode body 120 between the uncoated regions A1.

  The bottom surface spacer 170 has two first portions 171 that face the uncoated region A1 of the electrode body 120 and a second portion 172 that faces the coated region A2 of the electrode body 120. In the bottom spacer 170, the cross-sectional shape of the first portion 171 in a plane orthogonal to the winding axis direction of the electrode body 120 is different from the cross-sectional shape of the second portion 172 in the plane.

  Specifically, as shown in FIGS. 5A and 5B, the first portion 171 is formed so that the thickness of the first portion 171 is larger than the thickness of the second portion 172. That is, the gap between the second portion 172 of the bottom spacer 170 and the coating area A2 of the electrode body 120 is larger than the gap between the first portion 171 of the bottom spacer 170 and the uncoated area A1 of the electrode body 120. It is formed as follows.

  Each first portion 171 has an inner surface portion 171a, two side surface portions 171b, and an outer surface portion 171c.

  The inner surface portion 171 a is a surface facing the electrode body 120 and has a shape along the outer surface of the electrode body 120. That is, in the bottom spacer 170, the shape of the first portion 171 on the electrode body 120 side is a shape along the outer surface of the uncoated region A1 of the electrode body 120. Specifically, the inner surface portion 171a has a concave curved shape.

  The side surface portion 171b is a planar surface disposed on both sides of the inner surface portion 171a. That is, in the bottom spacer 170, the side surface shape of the first portion 171 is a shape along the side surface of the inner surface of the container 100.

  The outer surface portion 171c is a planar surface disposed between the two side surface portions 171b so as to face the insulating material 180. That is, the bottom spacer 170 has a shape in which the bottom surface shape of the first portion 171 is along the bottom surface of the inner surface of the container 100.

  At least one side surface portion 171b and the inner surface portion 171a of the two side surface portions 171b are connected by a curved surface. That is, as shown in FIG. 5B, the two side surface portions 171b and the inner surface portion 171a are connected by the curved surface R1 and the curved surface R2. The curved surface R1 and the curved surface R2 are not particularly limited as long as they are curved surfaces. For example, the curved surfaces R1 and R2 are curved surfaces having an arcuate cross-sectional shape with a radius of 1 to 2 mm.

  Moreover, at least one side surface portion 171b and the outer surface portion 171c of the two side surface portions 171b are connected by a curved surface. That is, as shown in FIG. 5B, the two side surface portions 171b and the outer surface portion 171c are connected by the curved surface R3 and the curved surface R4. The curved surface R3 and the curved surface R4 are not particularly limited as long as the curved surface R3 and the curved surface R4 are curved surfaces. For example, the curved surfaces R3 and R4 are curved surfaces having an arcuate cross-sectional shape with a radius of 1 to 3 mm.

  Similarly to the first portion 171, the second portion 172 has an inner surface portion 172a, two side surface portions 172b, and an outer surface portion 172c.

  The inner surface portion 172 a is a surface facing the electrode body 120 and has a shape along the outer surface of the electrode body 120. That is, in the bottom spacer 170, the shape of the second portion 172 on the electrode body 120 side is a shape along the outer surface of the coating region A2 of the electrode body 120. Specifically, the inner surface portion 172a has a concave curved shape.

  The side surface portion 172b is a surface disposed on both sides of the inner surface portion 172a. That is, in the bottom spacer 170, the side surface shape of the second portion 172 is a shape along the side surface of the inner surface of the container 100.

  The outer surface portion 172 c is a surface that is disposed between the two side surface portions 172 b so as to face the insulating material 180. That is, the bottom spacer 170 has a shape in which the bottom surface shape of the second portion 172 is along the bottom surface of the inner surface of the container 100.

  And like the 1st part 171, at least 1 side part 172b and the inner surface part 172a are connected by the curved surface among the two side parts 172b. Here, both the two side surface portions 172b and the inner surface portion 172a are connected by a curved surface. In addition, although the shape of the said curved surface is not limited, For example, it is a curved surface which has an arc-shaped cross-sectional shape with a radius of 1-2 mm.

  Similarly to the first portion 171, at least one of the two side surfaces 172b and the outer surface 172c are connected by a curved surface. Here, both the two side surface portions 172b and the outer surface portion 172c are connected by a curved surface. In addition, although the shape of the said curved surface is not limited, For example, it is a curved surface which has the cross-sectional shape of circular arc shape whose radius is 1-3 mm.

  As described above, the bottom surface spacer 170 is located at the lateral end of the bottom surface spacer 170 so as to extend in the longitudinal direction of the bottom surface spacer 170 along the side of the electrode body 120. Is formed so that the surface forming the surface is a curved surface.

  Similar to the first portion 171 and the second portion 172, the inner surface portion of the side spacers 150 and 160 facing the electrode body 120 and the two side portions disposed on both sides of the inner surface portion are connected by a curved surface. You may decide. Further, the two side surface portions of the side spacers 150 and 160 and the outer surface portion disposed between the two side surface portions facing the insulating material 180 may be connected by a curved surface.

  As described above, according to power storage element 10 according to the embodiment of the present invention, bottom spacer 170 has a configuration arranged between insulating material 180 and electrode body 120. That is, the bottom spacer 170 having a relatively large volume, which is disposed along the bottom surface of the container 100, is fixed to the electrode body 120 while being sandwiched between the insulating material 180 and the electrode body 120. The container 100 is in a state where the bottom surface spacer 170 is fixed between the insulating material 180 and the electrode body 120 (that is, in a state where the relative position between the electrode body 120 and the bottom surface spacer 170 is fixed by the insulating material 180). As a result, the power storage element 10 is configured. In this way, the bottom spacer 170 inserted into the container 100 before the electrode body 120 and pushed into the bottom surface of the container 100 by the electrode body 120 is fixed to the electrode body 120 by the insulating material 180 and inserted into the container 100. Therefore, the bottom spacer 170 can be smoothly inserted into the container 100 while reducing the positional deviation of the bottom spacer 170 in the container 100.

  In addition, the power storage element 10 has a configuration in which the insulating material 180 is disposed so as to cover the electrode body 120 and the bottom spacer 170. That is, the electrode body 120 and the bottom surface spacer 170 are fixed so that the insulating material 180 wraps the electrode body 120 and the bottom surface spacer 170. For this reason, since the bottom surface spacer 170 is covered with the insulating material 180 and fixed to the electrode body 120 and inserted into the container 100, the bottom surface spacer 170 can be smoothly moved while reducing the displacement of the bottom surface spacer 170 in the container 100. It can be inserted into the container 100.

  Further, since the insulating material 180 is a sheet-like member, the bottom spacer 170 can be easily wrapped and fixed to the electrode body 120.

  Further, at least one side surface portion and the inner surface portion of the bottom spacer 170 are connected by a curved surface. That is, the bottom spacer 170 has a configuration in which a tip portion that comes into contact with the electrode body 120 when being fixed to the electrode body 120 is rounded. Thereby, when the bottom surface spacer 170 is fixed to the electrode body 120, it is possible to prevent the electrode body 120 from being damaged at the tip of the bottom surface spacer 170.

  Further, at least one side surface portion of the bottom surface spacer 170 and the outer surface portion are connected by a curved surface. That is, the bottom spacer 170 has a configuration in which corners that come into contact with the insulating material 180 are rounded. Accordingly, even when the bottom spacer 170 and the insulating material 180 are rubbed due to vibration or the like, it is possible to prevent the insulating material 180 from being damaged at the corners of the bottom spacer 170.

  Further, since the bottom spacer 170 is an insulating member, for example, when the bottom spacer 170 is wrapped with the insulating material 180 and fixed to the electrode body 120, the electrode is not damaged even if the insulating material 180 is damaged. The insulation between the body 120 and the container 100 can be ensured.

  Further, the thickness of the first portion 171 facing the active material uncoated area A1 of the bottom spacer 170 is thicker than the thickness of the second portion 172 facing the active material coated area A2 of the bottom spacer 170. Here, the uncoated area A <b> 1 is an area that is unlikely to cause a decrease in the performance of the power storage element 10 even when pressed. In this power storage element 10, in order to increase the vibration resistance, the thickness of the first portion 171 of the bottom spacer 170 facing the uncoated region A1 is made thicker than the second portion 172, and the uncoated region A1 is pressed. Therefore, vibration resistance can be improved without significantly reducing the performance of the electricity storage device 10. In addition, the coating area A2 is an area that easily swells due to repeated charge and discharge, and is an area in which the performance of the power storage element 10 is likely to be reduced when excessively compressed. For this reason, by making the thickness of the second portion 172 of the bottom spacer 170 thinner than the thickness of the first portion 171, it is possible to provide a space that allows the electrode body 120 to bulge. It is possible to prevent the performance of the element 10 from being degraded.

  Further, the bottom spacer 170 is formed so that the gap (clearance) between the electrode body 120 and the position facing the coating area A2 is larger than the clearance between the electrode body 120 and the position facing the uncoated area A1. ing. For this reason, even if the coating area A2 expands due to repeated charge and discharge, the electrode body 120 has a large clearance at a position facing the coating area A2, and thus allows the coating area A2 of the electrode body 120 to expand. it can. Further, since the electrode body 120 has a small clearance in the uncoated region A1 in which the performance degradation of the power storage element 10 due to pressure is unlikely to occur, the vibration resistance is improved in a state where the performance degradation of the power storage element 10 does not occur. Can be made.

  In addition, since the shape of the first portion 171 of the bottom spacer 170 on the electrode body 120 side is a shape along the electrode body 120, a gap (clearance) at a position corresponding to the first portion 171 can be minimized. For this reason, the bottom spacer 170 can further improve the vibration resistance in the first portion 171.

  Next, the manufacturing method of the electrical storage element 10 is demonstrated.

  FIG. 6 is a flowchart showing an example of a method for manufacturing power storage device 10 according to the embodiment of the present invention.

  7A to 7C are diagrams for explaining a method of manufacturing power storage device 10 according to the embodiment of the present invention. In the figure, the lid 110, the positive electrode current collector 130, the negative electrode current collector 140, and the side spacers 150 and 160 are omitted.

  First, as shown in FIG. 6, as a step of arranging the bottom spacer 170, the bottom spacer 170 is arranged between the insulating material 180 and the electrode body 120 (S <b> 102).

  Specifically, as shown in FIG. 7A, the bottom spacer 170 is placed on the insulating material 180 and attached. That is, the insulating material 180 is bonded and fixed to the bottom spacer 170 using an adhesive, an adhesive tape, or the like. Alternatively, the insulating material 180 may be welded and fixed to the bottom spacer 170 using ultrasonic welding or the like. Thereby, the position shift of the bottom surface spacer 170 in the container 100 can be effectively reduced. In addition, the electrode body 120 is placed horizontally on the side of the bottom spacer 170 on the insulating material 180 so that the bottom faces the bottom spacer 170.

  Then, as shown in FIG. 7B, the insulating material 180 is lifted together with the bottom spacer 170 so as to be wound around the electrode body 120. At this time, as shown in the figure, the tip of the bottom spacer 170 contacts the electrode body 120, but since the tip of the bottom spacer 170 is rounded, the electrode body 120 can be prevented from being damaged. it can.

  Then, as illustrated in FIG. 7C, the insulating material 180 is wound around the electrode body 120 so as to cover the bottom spacer 170 and the electrode body 120 with the insulating material 180. In this way, the bottom spacer 170 is disposed between the insulating material 180 and the electrode body 120.

  As described above, in the arrangement step, the bottom spacer 170 is placed on the insulating material 180 and the elongated belt-like positive electrode and the negative electrode are wound and wound in an oval shape around the winding axis. The bottom electrode 170 is disposed between the insulating material 180 and the electrode body 120 by placing the electrode body 120 placed sideways and winding the insulating material 180 around the electrode body 120. Thereby, manufacturing efficiency can be improved.

  Returning to FIG. 6, as a step of inserting the bottom spacer 170, the bottom spacer 170 is inserted into the container 100 together with the insulating material 180 and the electrode body 120 (S <b> 104).

  Specifically, as shown in FIG. 7C, the container 100 is placed horizontally so that the opening faces in the horizontal direction. Then, the assembly in which the bottom spacer 170 and the electrode body 120 are wrapped with the insulating material 180 is inserted into the container 100 from the opening of the container 100 in the horizontal direction.

  In this way, by arranging the container 100 sideways, it becomes easy to hold the container 100 with a strong force, and it is easy to insert the assembly in which the bottom spacer 170 and the electrode body 120 are wrapped with the insulating material 180 into the container 100. Become.

  As described above, according to the method for manufacturing power storage device 10 according to the embodiment of the present invention, bottom spacer 170 is arranged between insulating material 180 and electrode body 120. That is, the bottom spacer 170 is fixed to the electrode body 120 while being sandwiched between the insulating material 180 and the electrode body 120. And the electrical storage element 10 is comprised by inserting the bottom face spacer 170 in the container 100 in the state fixed between the insulating material 180 and the electrode body 120. FIG. Thus, since the bottom spacer 170 is fixed to the electrode body 120 with the insulating material 180 and inserted into the container 100, the bottom spacer 170 can be smoothly placed in the container while reducing the positional deviation of the bottom spacer 170 in the container 100. 100 can be inserted.

  In addition, the bottom spacer 170 is disposed between the insulating material 180 and the electrode body 120 so that the insulating material 180 covers the electrode body 120 and the bottom spacer 170. That is, the electrode body 120 and the bottom surface spacer 170 are fixed so that the insulating material 180 wraps the electrode body 120 and the bottom surface spacer 170. For this reason, since the bottom surface spacer 170 is covered with the insulating material 180 and fixed to the electrode body 120 and inserted into the container 100, the bottom surface spacer 170 can be smoothly moved while reducing the displacement of the bottom surface spacer 170 in the container 100. Can be inserted into a container.

(Modification 1)
Next, Modification 1 of the present embodiment will be described. In the above embodiment, the insulating material 180 is a sheet-like member. However, in the first modification, the insulating material is a bag-shaped member.

  FIG. 8 is a diagram showing a configuration of a power storage element 11 according to the first modification of the embodiment of the present invention. In the figure, the container 100 is omitted, and the internal structure of the container 100 is shown.

  As shown in the figure, the power storage element 11 includes a bag-shaped insulating material 181 having an upper opening. Here, the insulating material 181 is an insulating material formed by processing an insulating sheet into a bag shape.

  The insulating material 181 is disposed so as to cover the bottom spacer 170 and the electrode body 120. That is, the electrode body 120, the positive electrode current collector 130, the negative electrode current collector 140, the side spacers 150 and 160, and the bottom spacer 170 are accommodated inside the insulating material 181 and inserted into the container 100. Is done.

  Here, the insulating material 181 has a size so that the electrode body 120, the positive electrode current collector 130, the negative electrode current collector 140, the side spacers 150 and 160, and the bottom surface spacer 170 can be accommodated inward. Adjusted and molded. The insulating material 181 may not be able to accommodate all of the electrode body 120 inward, and may be formed so as to cover only a part of the lower part of the electrode body 120.

  As described above, according to power storage element 12 according to Modification 1 of the embodiment of the present invention, bag-shaped insulating material 181 covers electrode body 120 and spacers (side spacers 150 and 160 and bottom spacer 170). It has the structure arranged in this way. That is, the electrode body 120 and the spacer are fixed so that the insulating material 181 wraps the electrode body 120 and the spacer. For this reason, since the spacer is covered with the insulating material 181, fixed to the electrode body 120 and inserted into the container 100, the spacer is smoothly inserted into the container 100 while reducing the displacement of the spacer in the container 100. Can be inserted.

(Modification 2)
Next, a second modification of the present embodiment will be described. In the above embodiment, the insulating material 180 is disposed so as to cover both the bottom spacer 170 and the side spacers 150 and 160. However, in the second modification, the insulating material is disposed so as to cover the bottom spacer 170 and / or the side spacers 150 and 160.

  9-11 is a figure which shows the structure of the electrical storage element which concerns on the modification 2 of embodiment of this invention. In FIGS. 9 and 10, the container 100 is omitted, and the internal configuration of the container 100 is shown.

  As shown in FIG. 9, the power storage element 12 includes a rectangular sheet-like insulating material 182. The insulating material 182 is disposed so as to cover the bottom spacer 170 and the electrode body 120. That is, the electrode body 120, the positive electrode current collector 130, the negative electrode current collector 140, the side spacers 150 and 160, and the bottom surface spacer 170 are covered so as to be wrapped in the insulating material 182 from below the electrode body 120. .

  Here, the size of the insulating material 182 is adjusted and molded so as to enclose the electrode body 120, the positive electrode current collector 130, the negative electrode current collector 140, the side surface spacers 150 and 160, and the bottom surface spacer 170. Has been. For example, after the side spacers 150 and 160 are assembled to the electrode body 120, the electrode body 120 and the side spacers 150 and 160 are wrapped by the insulating material 182 bonded or ultrasonically welded to the bottom spacer 170, and the insulating material 182 is Heat welded to the spacers 150 and 160. The insulating material 182 does not have to wrap all of the electrode body 120, and may be formed so as to cover only a part of the electrode body 120.

  As illustrated in FIG. 10, the power storage element 13 includes a rectangular sheet-like insulating material 183. The insulating material 183 is disposed so as to cover the side spacers 150 and 160 and the electrode body 120. That is, the electrode body 120, the positive electrode current collector 130, the negative electrode current collector 140, the side surface spacers 150 and 160, and the bottom surface spacer 170 are covered so as to be wrapped by the insulating material 183 from the side of the electrode body 120. Is called.

  And as shown in FIG. 11, the edge part of the insulating material 183 is fixed by the adhesive tape 184 etc., and it inserts in the container 100. FIG.

  Here, the size of the insulating material 183 is adjusted and molded so as to enclose the electrode body 120, the positive electrode current collector 130, the negative electrode current collector 140, the side surface spacers 150 and 160, and the bottom surface spacer 170. Has been. The insulating material 183 does not have to wrap all of the electrode body 120, and may be formed so as to cover only a part of the electrode body 120.

  Further, in the case of the configuration of the electric storage element 13, in order to prevent the electrode body 120 and the insulating material 183 from being damaged, the corner portions of the side surface spacers 150 and 160 that are in contact with the electrode body 120 or the insulating material 183 in order to prevent damage to the electrode body 120 and the insulating material 183. Is preferably curved. That is, it is preferable that the inner surface portion of the side spacers 150 and 160 facing the electrode body 120 and the two side surfaces disposed on both sides of the inner surface portion are connected by a curved surface. Moreover, it is preferable that the two side surface portions of the side spacers 150 and 160 and the outer surface portion disposed between the two side surface portions facing the insulating material 183 are connected by a curved surface.

  As described above, according to the electricity storage devices 12 and 13 according to the second modification of the embodiment of the present invention, the insulating materials 182 and 183 include the electrode body 120 and the spacers (the side spacers 150 and 160 and the bottom spacer 170). It has the structure arrange | positioned so that it may cover from the downward direction or the side. That is, the insulating material 182 and 183 wraps the electrode body 120 and the spacer from below or from the side to fix the electrode body 120 and the spacer. For this reason, since the spacer is covered with the insulating materials 182 and 183 from below or from the side and fixed to the electrode body 120 and inserted into the container 100, the positional deviation of the spacer in the container 100 is reduced, and the spacer The spacer can be smoothly inserted into the container 100.

(Modification 3)
Next, a third modification of the present embodiment will be described. In the above embodiment, the bottom spacer 170 is composed of the two first portions 171 and the second portion 172 sandwiched between the two first portions 171. However, in the third modification, the bottom spacer 170 further has a third portion.

  FIG. 12 is a diagram showing a configuration of a bottom spacer 170A included in the energy storage device according to the third modification of the embodiment of the present invention.

  As shown in the figure, the bottom spacer 170A has two first portions 171 disposed at both ends in the longitudinal direction and two second portions 173 connected to the two first portions 171, respectively. . The bottom spacer 170 </ b> A has a third portion 174 between the two second portions 173.

  Here, the third portion 174 is a flat plate-like portion that is thinner than the two second portions 173. That is, bottom spacer 170A has such a shape that the thickness of the central portion of bottom spacer 170 in the above embodiment is reduced.

  Note that the shape of the third portion 174 is not limited to a flat plate shape, and may have any shape such as a curved surface shape. Moreover, the 1st part 171, the 2nd part 173, and the 3rd part 174 may be comprised with the same material, and may be comprised with a different material.

  As described above, according to the bottom surface spacer 170 </ b> A included in the energy storage device according to the third modification of the embodiment of the present invention, the third portion 174 that is thinner than the second portion 173 between the two second portions 173. Have That is, the bottom surface spacer 170A can support the electrode body 120 with the first portion 171 and the second portion 173, and therefore, by reducing the thickness of the third portion 174 that is not used for supporting the electrode body 120, the component material The cost can be reduced by reducing the cost.

(Modification 4)
Next, Modification 4 of the present embodiment will be described. In the said embodiment and its modification, suppose that the side part and outer surface part of the 1st part of a bottom surface spacer and the side part and outer surface part of a 2nd part had planar shape. However, in the fourth modification, the side surface portion and the outer surface portion of the bottom spacer have a curved shape.

  FIGS. 13A to 13C are diagrams for explaining a bottom spacer 170B included in the energy storage device according to Modification 4 of the embodiment of the present invention. Specifically, FIG. 13A is a diagram corresponding to the bottom surface spacer 170 of FIG. 5B, and FIGS. 13B and 13C are diagrams corresponding to the method for manufacturing the power storage device 10 of FIGS. 7A and 7B.

  As illustrated in FIG. 13A, the bottom spacer 170 </ b> B includes a first portion 175 and a second portion 176. The first portion 175 includes an inner surface portion 175a on the upper surface, two side surface portions 175b on the side surface, and an outer surface portion 175c on the bottom surface. Similarly, the second portion 176 includes an inner surface portion 176a on the upper surface, two side surface portions 176b on the side surface, and an outer surface portion 176c on the bottom surface.

  Here, the two side surface portions 175b, the outer surface portion 175c, the two side surface portions 176b, and the outer surface portion 176c have a curved surface shape. That is, the side surface portion 175b is a curved surface disposed on both sides of the inner surface portion 175a, and the outer surface portion 175c is a curved surface disposed between the two side surface portions 175b so as to face the insulating material 180. It is. The side surface portion 176b is a curved surface disposed on both sides of the inner surface portion 176a, and the outer surface portion 176c is a curved surface disposed between the two side surface portions 176b so as to face the insulating material 180. It is.

  Then, in the manufacturing process of the electric storage element having such a bottom spacer 170B, as shown in FIG. 13B, first, the bottom spacer 170B is placed on the side of the electrode body 120 on the insulating material 180, and FIG. As shown, the insulating material 180 is lifted together with the bottom spacer 170B so as to be wound around the electrode body 120, and the insulating material 180 is wound around the electrode body 120.

  At this time, since the bottom surface spacer 170B is formed with curved side surfaces and outer surface portions, the insulating material 180 can be smoothly bent. The bottom spacer 170 </ b> B is inserted into the container 100 together with the insulating material 180 and the electrode body 120.

  Note that the side surface portion and the outer surface portion of the bottom spacer 170B are not limited to all having a curved surface shape, and the curved surface shape has two side surface portions 175b, an outer surface portion 175c, and two It may be a part of the side surface portion 176b and the outer surface portion 176c.

(Modification 5)
Next, Modification 5 of the present embodiment will be described. In the said embodiment and its modification, the side surface spacer and the bottom surface spacer were separate bodies. However, in the fifth modification, the spacer has a side part that functions as a side spacer and a bottom part that functions as a bottom spacer. FIG. 14 is a diagram for explaining a spacer 165 included in the energy storage device according to the fifth modification of the embodiment of the present invention.

  As illustrated in FIG. 14, the spacer 165 included in the energy storage device according to Modification 5 includes a side surface portion 165 a that functions as a side surface spacer, and a bottom surface portion 165 b that functions as a bottom surface spacer. The constituent elements other than the spacer 165 of this power storage element are similar to the constituent elements included in the power storage element 12 shown in FIG.

  The side surface portion 165a is disposed along the side wall of the container. The bottom surface portion 165b is disposed along the bottom surface of the container. The side surface portion 165a extends in a direction substantially orthogonal to the bottom surface portion 165b. After the spacer 165 is assembled to the electrode body 120 shown in FIG. 9, the bottom surface portion 165 b is wrapped together with the electrode body 120 by the insulating material 182.

  The power storage device according to the embodiment of the present invention and the modification thereof has been described above, but the present invention is not limited to this embodiment and the modification thereof.

  In other words, it should be considered that the embodiment and its modification disclosed this time are illustrative and not restrictive in all respects. 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. Moreover, the form constructed | assembled combining the said embodiment and the said modification arbitrarily is also contained in the scope of the present invention.

  For example, in the above embodiment, the bottom spacer 170 has the first portion 171 and the second portion 172 having a thickness smaller than that of the first portion 171. However, the bottom spacer 170 may include a first portion 171 and a second portion 172 having a lower hardness than the first portion 171. Further, the bottom spacer 170 may not have the second part 172 but may have only the first part 171. Also with these configurations, the bottom surface spacer 170 can support the electrode body 120 while allowing the electrode body 120 to expand.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a power storage element that can smoothly insert a spacer into the container while reducing the displacement of the spacer in the container.

10, 11, 12, 13 Storage element 100 Container 110 Cover plate 120 Electrode body 130 Positive electrode current collector 140 Negative electrode current collector 150, 160 Side spacer 165 Spacer 165a Side surface portion 165b Bottom surface portion 170, 170A Bottom surface spacer 171 First portion 171a Inner surface Part 171b Side surface part 171c Outer surface part 172, 173 Second part 172a Inner surface part 172b Side surface part 172c Outer surface part 174 Third part 180, 181, 182, 183 Insulating material 184 Adhesive tape 200 Positive electrode terminal 300 Negative electrode terminal

Claims (5)

An electrode body having an uncoated region where the active material wherein the coating region where the active material on the positive electrode and the surface of the negative electrode is coated on the positive electrode and the surface of the negative electrode is not coated,
A container body that houses the electrode body and having a side wall rising from the bottom surface and the bottom surface, a container having a lid plate for closing an opening of the container body,
An insulating material disposed in the container and insulating the electrode body and the container;
A spacer disposed between a side wall of the container and an uncoated region of the electrode body ,
The insulating material is a sheet-like member that covers the spacer and the electrode body,
The spacer is disposed between the insulating material and the electrode body.   The power storage device further includes a current collector connected to an uncoated region of the electrode body,
  The spacer is disposed between a side wall of the container and the current collector.
  The electricity storage device according to claim 1.   The spacer includes a bottom surface portion disposed between the bottom surface of the container and the electrode body.
  The electrical storage element of Claim 1 or 2. The insulating material, the electric storage device according to any one of claims 1 to 3, which is bonded or welded to the spacer. Rises electrode having a uncoated regions where the active material wherein the coating region where the active material on the positive electrode and the surface of the negative electrode is coated on the positive electrode and the surface of the negative electrode is not coated, and the bottom surface from the bottom surface A container having a side wall and containing the electrode body and a lid plate closing the opening of the container body, an insulating material disposed in the container and insulating the electrode body and the container; and A method for manufacturing a power storage device comprising a spacer disposed between a side wall of the container and an uncoated region of the electrode body ,
An arrangement step of arranging the spacer between the insulating material and the electrode body, which is a sheet-like member covering the spacer and the electrode body;
The manufacturing method of an electrical storage element including the insertion process which inserts the said spacer in the said container with the said insulating material and the said electrode body.

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