JP2015069725A - Storage element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage element which allows an electrode body to be easily stored in a container.SOLUTION: A storage element 10 comprises: an electrode body made up of a first electrode body 141 and a second electrode body 142 each of which is formed by laminating a positive electrode, a negative electrode and a separator; a container 100 for storing the electrode body; and a spacer 400 arranged between the electrode body and the container 100. The spacer 400 has: a pair of tabular lateral faces 420 and 430 respectively arranged at positions, facing at least the ends of the electrode body in a direction intersecting the lamination direction, which are located on both outer sides in the lamination direction of the electrode body; and a bottom face 410 to which the pair of lateral faces 420 and 430 are connected such that they sandwich it in a lamination direction.

Description

  The present invention relates to a power storage device having a spacer disposed between a container and an electrode body.

  Conventionally, a secondary battery in which a compression member (hereinafter referred to as “spacer”) is disposed in a space between a container and a power storage unit (hereinafter referred to as “electrode body”) built in the container has been disclosed. (See Patent Document 1).

JP 2013-20851 A

  However, since the spacer of Patent Document 1 is composed of two independent members and is arranged so as to sandwich the electrode body in the thickness direction, it is difficult to store the electrode body and the spacer when storing them in the container. There's a problem.

  Therefore, the present invention has been made in view of such a situation, and an object of the present invention is to provide a power storage element that can easily store an electrode body in a container.

  In order to achieve the above object, an energy storage device according to one embodiment of the present invention includes an electrode body configured by stacking a positive electrode and a negative electrode, and a separator, a container that houses the electrode body, and the electrode A spacer disposed between a body and the container, the spacer including a pair of plate-shaped side surfaces disposed on both outer sides in the stacking direction of the electrode body, and the pair of side surface portions A plate-like first connection portion connected to the pair of side surface portions so as to sandwich the electrode body.

  According to this, the pair of side surface portions of the spacer are connected by the first connection portion so as to sandwich the electrode body in the stacking direction from both outer sides in the stacking direction of the electrode body. That is, the spacer can prevent the electrode body from spreading outward in the stacking direction. For this reason, the electrode body can be maintained in a compact state, and the electrode body can be easily accommodated in the container.

  In addition, for example, the first connection portion may be connected to the pair of side surface portions in a state where the pair of side surface portions are biased with respect to the electrode body.

  For this reason, an electrode body can be made into a more compact state by a pair of side part, and an electrode body can be easily accommodated in a container.

  Further, for example, the pair of side surface portions may sandwich both end portions of the electrode body in a direction crossing the stacking direction.

  For this reason, the spacer is provided at the end of the electrode body. That is, it is not provided in the central part of the electrode body. Therefore, in the electricity storage element, both a configuration in which the electrode body can be easily accommodated in the container and a configuration in which the electrode body is easily impregnated with the electrolyte can be achieved.

  In addition, for example, the container includes a lid and a main body that forms a space for accommodating the electrode body, and the lid is an end of the pair of side surface portions opposite to the first connection portion. You may have the control part which controls the space | interval of a part to a predetermined | prescribed space | interval.

  According to this, since the pair of side surface portions of the spacer are regulated at a predetermined interval by the regulating portion provided on the lid, it is possible to prevent the electrode body from spreading in the stacking direction.

  Further, for example, in the spacer, the pair of side surface portions is a rectangular plate shape, the first connection portion is connected to the first sides of the sides of the pair of side surface portions, and the pair You may have the 2nd connection part which has connected 2nd sides different from said 1st side of said side part.

  According to this, since the spacer is provided with the second connection portion, the second connection portion restricts the pair of side surface portions from expanding in the electrode body stacking direction starting from the first connection portion. That is, the spacer can more effectively prevent the electrode body from spreading in the stacking direction.

  Further, for example, the pair of side surface portions may be in contact with both outer surfaces of the electrode body in the stacking direction and an inner surface of the container.

  According to this, the electrode body is sandwiched between the spacers and accommodated while being in contact with the inner surface of the container. That is, the spacer can prevent the electrode body from vibrating inside the container.

  In addition, for example, the electrode body includes a first electrode body and a second electrode body, and the spacer is further between the pair of side surface portions, the first electrode body and the second electrode body. An intermediate portion provided between the electrode bodies, the intermediate portion sandwiching the first electrode body together with one of the pair of side surface portions, and the second electrode body together with the other of the pair of side surface portions. You may connect with said 1st side part by said 1st connection part so that it may pinch | interpose.

  According to this, since the spacer sandwiches the first electrode body between one of the pair of side surface portions and the intermediate portion, and sandwiches the second electrode body between the pair of side surface portions and the intermediate portion, the spacer sandwiches only the pair of side surface portions. It can press more reliably with respect to a 1st electrode body and a 2nd electrode body rather than the case. For this reason, the spacer can more securely prevent the first electrode body and the second electrode body from vibrating inside the container.

  According to the electricity storage device of the present invention, the electrode body can be easily accommodated in the container.

It is a perspective view of the electrical storage element which concerns on this Embodiment. It is a perspective view which shows each component with which the main body of the container of an electrical storage element is isolate | separated and with which an electrical storage element is provided. It is a perspective view which shows the external appearance of a spacer. It is sectional drawing at the time of seeing an electrical storage element from the X-axis direction. It is a perspective view which shows the external appearance of the spacer which concerns on a modification (1). It is a perspective view which shows the external appearance of the spacer which concerns on a modification (2). It is a perspective view which shows the external appearance of the spacer which concerns on a modification (3). It is sectional drawing at the time of seeing the electrical storage element which concerns on a modification (4) from the X-axis direction. It is a perspective view which shows the external appearance of the spacer which concerns on a modification (5).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. The shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are examples, and are not intended to limit the present invention. The invention is limited only 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.

(Embodiment 1)
First, the configuration of the power storage element 10 will be described.

  FIG. 1 is a perspective view schematically showing the external appearance of the energy storage device according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing each component included in power storage element 10 by separating main body 111 of container 100 of power storage element 10 according to the embodiment of the present invention. In these drawings, for each of the X-axis direction, the Y-axis direction, and the Z-axis direction (described later for each direction), the direction of the arrow is the plus direction, and the opposite direction is the minus direction. And The same applies to the following drawings.

  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. 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 these drawings, the electricity storage device 10 includes a container 100, a positive electrode terminal 200, and a negative electrode terminal 300. Further, inside the container 100, a positive electrode current collector 120, a negative electrode current collector 130, a first electrode body 141 and a second electrode body 142 which are two electrode bodies, and a spacer 400 are accommodated. .

  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 main body 111 having a rectangular cylindrical shape and a bottom surface 112 (see FIG. 4), and a lid body 110 that is a plate-like member that closes an opening of the main body 111. Moreover, the container 100 can seal an inside by accommodating the 1st electrode body 141, the 2nd electrode body 142 grade | etc., Inside, and the lid body 110 and the main body 111 being welded. Yes. The material of the lid body 110 and the main body 111 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, or aluminum alloy.

  The first electrode body 141 and the second electrode body 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. In addition, since the 1st electrode body 141 and the 2nd electrode body 142 have the same structure, below, it demonstrates centering on the description about the 1st electrode body 141, and the description about the 2nd electrode body 142 is abbreviate | omitted or simplified. Turn into.

  The 1st electrode body 141 is a member which is comprised by laminating | stacking a positive electrode and a negative electrode, and a separator, and can store electricity. In the positive electrode, a positive electrode active material layer is formed on a positive electrode base material foil which is a long strip-shaped metal foil made of aluminum or an aluminum alloy. The negative electrode is obtained by forming a negative electrode active material layer on a negative electrode substrate foil, which is a long strip-shaped metal foil made of copper, a copper alloy, or the like. The separator is a microporous sheet made of 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 1st electrode body 141 is formed by winding what was arrange | positioned in layers so that a separator may be pinched | interposed between a negative electrode and a positive electrode. In the figure, the first electrode body 141 has an oval shape, but it may be circular or elliptical. The shape of the first electrode body 141 is not limited to the winding type, and may be a shape in which flat plate plates are stacked.

  The positive electrode and the negative electrode are wound in an ellipse shape around the rotation 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 a 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. The positive electrode current collector 120 and the negative electrode current collector 130 are perpendicular to the winding axis direction at both ends of the first electrode body 141 and the second electrode body 142 in the winding axis direction (X-axis direction). It is arranged extending in the direction. In addition, the 1st electrode body 141 and the 2nd electrode body 142, the positive electrode electrical power collector 120, and the negative electrode electrical power collector 130 are joined by ultrasonic welding, for example.

  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. .

  The positive electrode terminal 200 is an electrode terminal electrically connected to the positive electrode of the first electrode body 141 and the positive electrode of the second electrode body 142, and the negative electrode terminal 300 is the negative electrode of the first electrode body 141 and the second electrode body 142. It is an electrode terminal electrically connected to the negative electrode. That is, the positive electrode terminal 200 and the negative electrode terminal 300 lead the electricity stored in the first electrode body 141 and the second electrode body 142 to the external space of the power storage element 10, and the first electrode body 141 and the second electrode It is a metal electrode terminal for introducing electricity into the internal space of the electricity storage element 10 in order to store electricity in the body 142.

  Further, the positive electrode terminal 200 and the negative electrode terminal 300 are attached to the lid body 110 disposed above the first electrode body 141 and the second electrode body 142. Note that, between the positive electrode terminal 200 and the lid body 110, between the positive electrode current collector 120 and the lid body 110, between the negative electrode terminal 300 and the lid body 110, and between the negative electrode current collector 130 and the lid body 110. In FIG. 1, a packing or the like is also arranged, but is omitted in FIGS.

  The positive electrode current collector 120 is disposed between the positive electrodes of the first electrode body 141 and the second electrode body 142 and the side wall of the main body 111 of the container 100, and the positive electrode terminal 200, the first electrode body 141, and the second electrode body 142. This is a member having electrical conductivity and rigidity that are electrically connected to the positive electrode. The positive electrode current collector 120 is made of aluminum, an aluminum alloy, or the like, like the positive electrode base foil of the first electrode body 141 and the second electrode body 142.

  The negative electrode current collector 130 is disposed between the negative electrodes of the first electrode body 141 and the second electrode body 142 and the side wall of the main body 111 of the container 100, and the negative electrode terminal 300, the first electrode body 141, and the second electrode body 142. This is a member having electrical conductivity and rigidity that are electrically connected to the negative electrode. Note that the negative electrode current collector 130 is formed of copper, a copper alloy, or the like, like the negative electrode base foils of the first electrode body 141 and the second electrode body 142.

  The spacer 400 is an insulating member disposed between the electrode body including the first electrode body 141 and the second electrode body 142 and the main body 111 of the container 100. The spacer 400 is made of, for example, a resin such as PPS (Polyphenylene Sulfide) or PP (Polypropylene).

  FIG. 3 is a perspective view showing the appearance of the spacer. FIG. 4 is a cross-sectional view of the power storage element when viewed from the X-axis direction.

  As shown in FIG. 3, the spacer 400 includes a first side surface portion 420 and a second side surface portion 430 which are a pair of plate-like side surface portions, and a bottom surface portion 410 as a first connection portion.

  The pair of side surface portions 420 and 430 are positions on both outer sides in the stacking direction (Y-axis direction) of the first electrode body 141 and the second electrode body 142 and intersect with the Y-axis direction (X-axis direction or Z-axis direction). (Axial direction) are disposed at positions facing both ends of the first electrode body 141 and the second electrode body 142. More specifically, the pair of side surface portions 420 and 430 are disposed at positions facing both ends of the first electrode body 141 and the second electrode body 142 in the winding axis direction. Thus, the spacer 400 restrains both ends of the first electrode body 141 and the second electrode body 142 by the pair of side surfaces 420 and 430. That is, the first electrode body 141 and the second electrode body 142 are restrained by the restraint portions (both ends in the winding axis direction) restrained by the pair of side surface portions 420 and 430 and the pair of side surface portions 420 and 430. And a non-restraining portion (a central portion between both ends in the winding axis direction). Each of the pair of side portions 420 and 430 further includes first portions 421 and 431, second portions 422 and 432, and third portions 423 and 433. Further, as shown in FIG. 4, the pair of side surfaces 420, 430 includes the outer surfaces in the Y-axis direction of the first electrode body 141 and the second electrode body 142, and the pair of long side surfaces 113, 114 of the main body 111. And may be in contact with.

  The first portions 421 and 431 and the second portions 422 and 432 are on the sides of the end portions of the first electrode body 141 and the second electrode body 142 in the X-axis direction (that is, the winding axis direction of the electrode bodies 141 and 142). It is a long plate-like portion that faces each other and whose longitudinal direction extends in the Z-axis direction. The first portions 421 and 431 and the second portions 422 and 432 are portions of the first electrode body 141 and the second electrode body 142 in the X axis direction where the positive electrode base material or the negative electrode base material is exposed. Opposite the part. In other words, the first portions 421 and 431 and the second portions 422 and 432 are in the first electrode body 141 and the second electrode body 142 in both ends of the first electrode body 141 and the second electrode body 142 in the X-axis direction. It faces the portion excluding the portion where the positive electrode current collector 120 and the negative electrode current collector 130 are connected.

  Accordingly, the first electrode body 141 and the second electrode body 142, the positive electrode current collector 120, and the negative electrode current collector 130 are ultrasonicated in a state where the spacer 400 is attached to the first electrode body 141 and the second electrode body 142. Can be welded. That is, the positive electrode collector is mounted in a state in which the positive electrode, the negative electrode, or the separator of the first electrode body 141 and the second electrode body 142 is not turned over by attaching the spacer 400 to the first electrode body 141 and the second electrode body 142. Since the electric body 120 and the negative electrode current collector 130 can be attached to the first electrode body 141 and the second electrode body 142, ultrasonic welding can be easily performed.

  The third portions 423 and 433 connect the first portions 421 and 431 and the second portions 422 and 432 on the Z-axis negative direction side, and are continuous with the bottom surface portion 410. The longitudinal direction is the X-axis direction. It is a long plate-like portion that extends. Thus, since the third portions 423 and 433 are provided on the pair of side surface portions 420 and 430 of the spacer 400, the end portions on the Z-axis minus direction side of the first electrode body 141 and the second electrode body 142 are arranged. Can be protected. That is, since the spacer 400 is provided with the bottom surface portion 410 and the third portions 423 and 433, when the first electrode body 141 and the second electrode body 142 are accommodated inside the main body 111, the opening portion of the main body 111 is opened. In addition, it is possible to prevent the first electrode body 141 and the second electrode body 142 from being damaged by being hooked on the Z-axis negative direction side ends. For this reason, the operation | work which accommodates the 1st electrode body 141 and the 2nd electrode body 142 in the inside of the main body 111 can be made easy.

  The bottom surface portion 410 is connected to the pair of side surface portions 420 and 430 such that the pair of side surface portions 420 and 430 sandwich the first electrode body 141 and the second electrode body 142 in the Y-axis direction. Further, the bottom surface portion 410 has a pair of side surface portions 420 and 430 in a state where the pair of side surface portions 420 and 430 are urged (pressed) against the first electrode body 141 and the second electrode body 142. Connected. The bottom surface portion 410 is a long plate-like member that supports end portions in the Z-axis direction of the first electrode body 141 and the second electrode body 142. The bottom surface portion 410 may be further in contact with the bottom surfaces 141 a and 142 a on the Z axis minus direction side of the first electrode body 141 and the second electrode body 142 and the bottom surface 112 of the main body 111. The pair of side surface portions 420 and 430 are formed in a state of being fixed to the Z-axis plus direction side continuously from a pair of opposing sides extending in the longitudinal direction of the bottom surface portion 410.

  As described above, the spacer 400 sandwiches both ends of the first electrode body 141 and the second electrode body 142 in the winding axis direction (that is, the X-axis direction) between the pair of side surface parts 420 and 430 in the stacking direction. . That is, the pair of side surface portions 420 and 430 of the spacer 400 are portions of the end portions of the first electrode body 141 and the second electrode body 142 where the end surfaces of the positive electrode and the negative electrode and the separator are exposed (that is, All the end surfaces in the winding axis direction) are sandwiched in the Y-axis direction. The spacer 400 can sandwich a portion of the first electrode body 141 and the second electrode body 142 where the positive electrode, the negative electrode, and the separator easily spread. For this reason, in the electrical storage element 10, it can prevent that foreign materials, such as a metal piece, mix in the inside (between a positive electrode or a negative electrode, and a separator) of the 1st electrode body 141 and the 2nd electrode body 142. FIG. Thereby, it is possible to prevent the positive electrode and the negative electrode from being short-circuited due to the foreign matter inside the first electrode body 141 and the second electrode body 142.

  According to power storage device 10 according to the present exemplary embodiment, spacer 400 has first side surface portion 420 and second side surface portion 430 in the stacking direction (Y-axis direction) of first electrode body 141 and second electrode body 142. The first electrode body 141 and the second electrode body 142 are connected by the bottom surface portion 410 so as to sandwich the first electrode body 141 and the second electrode body 142 in the Y-axis direction from both outsides. That is, the spacer 400 can prevent the first electrode body 141 and the second electrode body 142 from spreading outward in the Y-axis direction. For this reason, the 1st electrode body 141 and the 2nd electrode body 142 can be maintained in a compact state, and the 1st electrode body 141 and the 2nd electrode body 142 can be easily accommodated in the container 100.

  Further, according to power storage device 10 according to the present exemplary embodiment, spacer 400 is not provided in a portion other than the end portions of first electrode body 141 and second electrode body 142 (that is, the central portion). For this reason, in the electrical storage element 10, the structure which can accommodate the 1st electrode body 141 and the 2nd electrode body 142 in the container 100 easily, and electrolyte solution tends to be impregnated with respect to the 1st electrode body 141 and the 2nd electrode body 142 It is possible to achieve both configuration.

  Further, in general, when charging and discharging are repeated, the electricity storage element generates gas inside the container, so that the internal pressure of the container increases. For this reason, the container tends to swell as the internal pressure increases. That is, the portion of the container that faces the end of the electrode body is unlikely to swell. Thus, in the electrical storage element 10 of the present embodiment, since the spacer 400 sandwiches only both ends of the first electrode body 141 and the second electrode body 142 where the container 100 is difficult to expand, the container 100 is temporarily expanded. Even if it is a case, the state contacted between the container 100, the 1st electrode body 141, and the 2nd electrode body 142 can be maintained. For this reason, the spacer 400 can effectively prevent the first electrode body 141 and the second electrode body 142 from vibrating inside the container 100.

  Moreover, according to the electrical storage element 10 according to the present embodiment, the first electrode body 141 and the second electrode body 142 are sandwiched between the spacers 400 and accommodated while being in contact with the inner surface of the container 100. Become. Thereby, the spacer 400 can prevent the first electrode body 141 and the second electrode body 142 from vibrating inside the container 100.

  In addition, according to the electricity storage device 10 according to the present exemplary embodiment, the spacer 400 is fixed to the bottom surface portion 410 in a direction in which the pair of side surface portions 420 and 430 intersect the bottom surface portion 410. The pair of side surface portions 420 and 430 have such rigidity that the first electrode body 141 and the second electrode body 142 can be sandwiched therebetween. That is, in the electricity storage device 10 according to the present exemplary embodiment, the first electrode body 141 and the second electrode body 142 are accommodated in the container 100 while being held by the spacer 400 even if it is assumed that an external impact has been received. Therefore, the movement of the first electrode body 141 and the second electrode body 142 relative to the container 100 can be reduced.

(Modification)
(1)
According to the electricity storage device 10 according to the above-described embodiment, the spacer 400 includes the bottom surface portion 410 and the pair of side surface portions 420 and 430. As illustrated in FIG. A spacer 400a having short side portions 441 and 442 may be employed. That is, the spacer 400a further includes a short side surface portion 441 as a second connection portion that connects second sides different from the first sides of the pair of side surface portions 420 and 430 to which the bottom surface portion 410 is connected. 442 may be included. More specifically, as shown in FIG. 5, the short side surface portions 441 and 442 are both ends of the pair of side surface portions 420 and 430 in the X-axis direction and connect the Z-axis negative direction side portions to each other. Shaped member. In addition, as a 2nd connection part, a rod-shaped member may be sufficient and a sheet-like member may be sufficient, and a pair of side part 420a, 430a (the 1st side part 420a and the 2nd side part 430a) is. If it is the structure which controls so that it may not spread in a Y-axis direction, it will not necessarily be a plate-shaped member like the short side parts 441 and 442. Further, the present invention is not limited to being provided in the Z-axis minus direction side portion of the pair of side surfaces 420a and 430a, and may be provided in the Z-axis plus direction side portion. In FIG. 5, the same components as those of the spacer 400 according to the above embodiment are denoted by the same reference numerals.

(2)
According to the electricity storage device 10 according to the above-described embodiment, the spacer 400 has a configuration in which the central part of the pair of side surface parts 420 and 430 is cut out. However, as shown in FIG. A spacer 400b having a pair of side surface portions 420b and 430b (first side surface portion 420b and second side surface portion 430b) that are not cut out may be employed. Even with the spacer 400b having such a configuration, the first electrode body 141 and the second electrode body 142 can be maintained in a compact state, and the first electrode body 141 and the second electrode body 142 are accommodated in the container 100. There is an effect that it can be easily performed. In FIG. 6, the same components as those of the spacer 400 according to the above embodiment are denoted by the same reference numerals.

(3)
According to the electricity storage device 10 according to the above-described embodiment, the spacer 400 is connected to the ends of the first portions 421 and 431 and the second portions 422 and 432 on the Z-axis plus direction side of the pair of side portions 420 and 430. The configuration is not limited to this. For example, as shown in FIG. 7, a pair of side portions provided with fourth portions 424 and 434 connecting the end portions of the first portions 421 and 431 and the second portions 422 and 432 on the Z-axis plus direction side. A spacer 400c having 420c and 430c (first side surface portion 420c and second side surface portion 430c) may be employed.

  In addition, according to the electricity storage device 10 according to the above embodiment, the first electrode body 141 and the second electrode body 142 are wound electrode bodies, but a stacked electrode body may be employed. The spacer 400c is particularly effective in the case of a stacked electrode body. That is, many of the stacked electrode bodies have a rectangular parallelepiped shape in which a rectangular positive electrode and negative electrode and a separator are stacked, and therefore, a portion where the end faces of the positive electrode and the negative electrode and the separator are exposed, Unlike the two places on both sides in the winding axis direction of the winding type, it is formed at four places corresponding to the four sides of the rectangular positive and negative electrodes and the separator. For this reason, the four end portions on the side where the end surfaces of the positive electrode, the negative electrode, and the separator are exposed as in the spacer 400c are connected to the first to fourth portions 421 and 431 as in the pair of side surface portions 420c and 430c. 422, 432, 423, 433, 424, 434, respectively. Thereby, rectangular openings 425 and 435 are formed at the center of the pair of side surfaces 420c and 430c.

  For this reason, the spacer 400c can sandwich the positive electrode, the negative electrode, and the portion where the separator is easily turned in the stacking direction. Thereby, it can prevent effectively that an electrode body spreads in the lamination direction, and can accommodate an electrode body in a container easily. In addition, since the rectangular openings 425 and 435 are formed in the central part of the pair of side surfaces 420c and 430c, the first electrode body 141 and the second electrode body 142 are further easily impregnated with the electrolytic solution. There is also an effect.

(4)
According to the electricity storage device 10 according to the above embodiment, although not particularly mentioned, as shown in FIG. 8, the pair of side surfaces 420 and 430 of the spacer 400 is opposite to the bottom surface 410 (that is, the Z axis). It is good also as the electrical storage element 10a which employ | adopted the cover body 110a which has the protrusion part 110b as a control part for controlling the space | interval of the edge part of the plus direction side to the predetermined space | interval W1. That is, the container 100a includes a lid 110a having a protruding portion 110b.

  According to this, a pair of side surface parts 420 and 430 of the spacer 400 are regulated at a predetermined interval W1 by the protruding part 110b provided on the lid 110a. For this reason, the state which prevented the 1st electrode body 141 and the 2nd electrode body 142 from spreading in the lamination direction (Y-axis direction) more effectively can be maintained. Thereby, in the electrical storage element 10a, the 1st electrode body 141 and the 2nd electrode body 142 can be easily accommodated in the main body 111. FIG.

  Further, the “regulating portion provided on the lid body 110” as used herein is directly formed on the lid body 110 as shown in FIG. 8 and also on the inner side of the container 100 (that is, on the Z axis minus direction side). In addition to the protruding portion protruding, the positive electrode current collector 120 and the negative electrode current collector 130 are formed on the inner packing disposed between the lid body 110 and the container 100 inside (that is, the Z-axis minus direction) A protruding portion protruding to the side) may be included. That is, the restricting portion may include not only a portion formed continuously with the lid body 110 but also a portion formed on a member joined to the lid body 110 by another member.

(5)
According to the electricity storage device 10 according to the above-described embodiment, the spacer 400 does not include a component disposed between the first electrode body 141 and the second electrode body 142, but is not limited thereto. For example, like the spacer 400d shown in FIG. 9, an intermediate portion 450 provided between the first electrode body 141 and the second electrode body 142 between the pair of side surface parts 420 and 430 is further provided. Also good. The intermediate portion 450 sandwiches the first electrode body 141 together with the first side surface portion 420 that is one of the pair of side surface portions 420 and 430, and the second electrode body 142 is the other of the pair of side surface portions 420 and 430. The bottom surface portion 410 is connected together with the pair of side surface portions 420 and 430 so as to be sandwiched with the two side surface portions 430.

  According to this, the spacer 400d sandwiches the first electrode body 141 between the first side surface portion 420 and the intermediate portion 450, and sandwiches the second electrode body 142 between the second side surface portion 430 and the intermediate portion 450. The first electrode body 141 and the second electrode body 142 can be more reliably pressed than when sandwiched between the side surfaces 420 and 430 alone. For this reason, the spacer 400d can prevent the first electrode body 141 and the second electrode body 142 from vibrating inside the container 100 more firmly.

(6)
According to the electricity storage device 10 according to the above embodiment, the spacer 400 includes the first portions 421 and 431 and the second portions 422 and 432 at both ends of the first electrode body 141 and the second electrode body 142 in the X-axis direction. Of these, the positive electrode base material or the negative electrode base material is opposed to a portion other than the exposed portion, but is not limited thereto. That is, the spacer may face at least a part of a portion where the positive electrode base material or the negative electrode base material is exposed.

(7)
According to the electricity storage device 10 according to the above-described embodiment, the first electrode body 141 and the second electrode body 142 have a plurality of electrode bodies. Even in this case, the spacers 400 and 400a to 400c of the above-described embodiment and modifications (1) to (4) and (6) can be applied.

  The power storage element according to one embodiment of the present invention is useful as a lithium ion battery or the like that can easily accommodate an electrode body in a container.

10, 10a Storage element 100, 100a Container 110, 110a Lid 110b Protruding part 111 Main body 112 Bottom surface 113, 114 Long side surface 120 Positive electrode current collector 130 Negative electrode current collector 141 First electrode body 141a Bottom surface 142 Second electrode body 142a Bottom surface 200 Positive electrode terminal 300 Negative electrode terminal 400, 400a to 400d Spacer 410 Bottom surface portion 420, 420a to 420c First side surface portion 421, 431 First portion 422, 432 Second portion 423, 433 Third portion 424, 434 Fourth portion 425, 435 Openings 430, 430a to 430c Second side surface portions 441, 442 Short side surface portion 450 Intermediate portion

Claims (7)

An electrode body configured by laminating a positive electrode and a negative electrode, and a separator;
A container for housing the electrode body;
A spacer disposed between the electrode body and the container,
The spacer is
A pair of plate-like side portions disposed on both outer sides of the electrode body in the stacking direction;
A plate-like first connection portion connected to the pair of side surface portions so that the pair of side surface portions sandwich the electrode body. The power storage device according to claim 1, wherein the first connection portion is connected to the pair of side surface portions in a state where the pair of side surface portions are biased with respect to the electrode body. The power storage device according to claim 1, wherein the pair of side surface portions sandwich both end portions of the electrode body in a direction intersecting the stacking direction. The container has a lid and a main body that forms a space for accommodating the electrode body,
The said cover body has a control part which controls the space | interval of the edge part on the opposite side to said 1st connection part in a pair of said side part to a predetermined | prescribed space | interval. Power storage element. The spacer is
The pair of side portions are rectangular plates,
The first connection part connects the first sides of the pair of side surface parts,
5. The power storage device according to claim 1, further comprising a second connection portion that connects second sides different from the first side of the pair of side surface portions. The power storage device according to any one of claims 1 to 5, wherein the pair of side surface portions are in contact with both outer surfaces of the electrode body in the stacking direction and an inner surface of the container. The electrode body has a first electrode body and a second electrode body,
The spacer further includes an intermediate portion provided between the pair of side surface portions and between the first electrode body and the second electrode body,
The intermediate portion sandwiches the first electrode body with one of the pair of side surface portions, and the pair of the pair of side surfaces by the first connection portion so as to sandwich the second electrode body with the other of the pair of side surface portions. The power storage device according to claim 1, connected together with the side surface.

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