JP2016100270A - Power storage element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage element capable of suppressing deterioration of performance.SOLUTION: A power storage element 10 includes: a positive electrode 141; a negative electrode 142; and an electrode body 140 formed by wounding separators 143 and 144. The power storage element 10 includes an insulating tape 150 where a part is overlapped and coupled to other part while the insulating tape is wounded around the electrode body 140 more than once or more along an outermost peripheral surface in the same direction as a direction where the electrode body 140 is wounded.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a power storage device having a wound electrode body formed by winding a positive electrode, a negative electrode, and a separator.

  2. Description of the Related Art Conventionally, some power storage devices including batteries such as lithium ion batteries have a wound electrode body in which a positive electrode, a negative electrode, and a separator are stacked and wound (for example, see Patent Document 1). In the electricity storage device having such a wound electrode body, it is necessary to fix the outermost periphery at the position of the winding end of the outermost periphery of the wound electrode body so that the winding state does not loosen. In general, a separator is disposed on the outermost periphery of the electrode body. At this time, as a method for fixing the separator at the position of the winding end of the outermost periphery of the wound electrode body, an insulating tape such as an adhesive tape is used. There is a way to fix it.

JP-A-11-250873

  However, in the configuration of fixing using the above-described conventional insulating tape, it is difficult to more reliably fix the outermost periphery of the electrode body while preventing the wound state of the electrode body from being loosened. For this reason, it becomes easy to loosen the fixing of the outermost peripheral part and a space (distance) between the positive electrode and the negative electrode of the wound electrode body is likely to be vacant, which may lead to a decrease in performance of the power storage element.

  Then, this invention is made | formed in view of such a condition, and it aims at providing the electrical storage element which can suppress that performance falls.

  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 formed by winding a positive electrode, a negative electrode, and a separator, and the electrode body is wound. Insulating tape that is partly overlapped and joined to the other part in a state of being wound around the electrode body one or more times along the outermost peripheral surface of the electrode body in the same direction as .

  According to this, in the state which wound the electrode body 1 or more times along the outermost peripheral surface of an electrode body, the one part overlaps and the other part of the insulating tape is joined. For this reason, the insulating tape can more reliably fix the outermost peripheral part of the electrode body.

  Furthermore, since the insulating tape is wound in the same direction as the direction in which the electrode body is wound, when the insulating tape is wound around the electrode body, a tensile force is applied to the outermost periphery of the electrode body. The electrode body can be wound one or more times. In other words, the state in which the electrode body is wound can be maintained by winding the insulating tape around the electrode body while suppressing the loosening of the wound electrode body. For this reason, the performance fall of an electrical storage element can be suppressed.

  Further, for example, the separator may include a base material layer and a particle-containing layer containing particles, and the particle-containing layer may be disposed on the outermost peripheral surface of the electrode body.

  Here, the following problems also occur in the conventional technique. Even when heat is generated at the time of abnormality, for example, a separator in which a heat-resistant layer containing inorganic particles is coated on one side of the separator (hereinafter referred to as “heat-resistant coating” in order to maintain insulation between the positive electrode and the negative electrode. "Separator") has been devised. When such a heat-resistant coated separator is applied to a wound electrode body, since the heat-resistant layer of the heat-resistant coated separator contains particles, it is difficult for the adhesive tape to be bonded, and the outermost part is bonded to the outermost portion. It is difficult to fix with insulating tape. For this reason, it becomes easy to loosen the fixing of the outermost peripheral part and a space (distance) between the positive electrode and the negative electrode of the wound electrode body is likely to be vacant, which may lead to a decrease in performance of the power storage element.

  According to this embodiment, the insulating tape is overlapped with the other part of the insulating tape that is easily bonded to the insulating tape in a state where the electrode body is wound one or more times along the outermost peripheral surface of the electrode body. It is joined. For this reason, since the insulating tape can fix the outermost periphery part of an electrode body, the state by which the electrode body was wound can be maintained. Thereby, it is possible to suppress the winding-type electrode body from being loosened, and it is possible to suppress a decrease in performance of the power storage element employing the separator provided with the particle-containing layer.

  For example, the insulating tape may be disposed on both sides of the electrode body in the winding axis direction of the electrode body.

  Thus, since the insulating tape does not cover the entire outermost peripheral surface of the electrode body, the permeability of the electrolytic solution to the electrode body can be improved.

  For example, the insulating tape may be disposed at a position where the distance from the edge of the separator in the winding axis direction of the electrode body is smaller than the width of the insulating tape.

  For this reason, it can suppress that the edge part of the winding axis direction of an electrode body turns out of the outermost edge parts of an electrode body. Thereby, since the state in which the electrode body is wound more firmly can be maintained, it is possible to further suppress the performance degradation of the power storage element.

  Further, for example, the inner end portion of the insulating tape may be disposed on the outermost end portion in the winding direction of the electrode body.

  For this reason, when the insulating tape is wound around the electrode body, the insulating tape can be wound around the electrode body one or more times while pressing the outermost edge of the separator (the outermost edge of the electrode body). it can. In this way, by holding the outermost end so that the electrode body does not loosen and then winding the insulating tape, the state in which the electrode body is wound so that the electrode body does not loosen can be maintained. Therefore, it is possible to further suppress the performance degradation of the power storage element.

  Further, for example, the inner end portion of the insulating tape is disposed on the outermost peripheral surface on a region on the winding direction side with respect to the outermost peripheral end portion in the winding direction of the electrode body. Also good.

  According to this, the insulating tape is wound around the electrode body one or more times, and the portion that overlaps the insulating tape itself is arranged in a region on the winding direction side from the outermost end portion of the electrode body. Can do. In other words, the portion where the insulating tape itself overlaps and is thicker than the other portion can be disposed at a lower height of the step formed by overlapping the outermost periphery of the electrode body. The structure of the assembly of the body and the insulating tape can be made compact.

  According to the electricity storage device of the present invention, it is possible to suppress the performance of the electricity storage device from being deteriorated.

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 perspective view which shows each component with which the main body of the container of the electrical storage element which concerns on embodiment of this invention isolate | separates, and an electrical storage element is provided. It is a figure for demonstrating the structure of an electrode body. It is a perspective view which shows the external appearance of an electrode body and an insulating tape. It is sectional drawing of an electrode body and an insulating tape. It is a figure for demonstrating the winding direction of an electrode body and an insulating tape. It is a perspective view which shows the external appearance of the electrode body which concerns on the modification 1, and an insulating tape. It is sectional drawing of the electrode body which concerns on the modification 1, and an insulating tape.

  Hereinafter, 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 connecting forms of the constituent elements shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements. In each drawing, dimensions and the like are not strictly illustrated.

(Embodiment)
FIG. 1 is a perspective view schematically showing an external appearance of a power storage device 10 according to an embodiment of the present invention. FIG. 2 is a perspective view showing components included in power storage element 10 by separating container body 111 of container 100 of power storage element 10 according to the embodiment of the present invention.

  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. For example, the electric storage element 10 is applied to an electric vehicle (EV), a plug-in hybrid electric vehicle (PHEV), a hybrid electric vehicle (HEV), or the like. 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, a negative electrode terminal 300, and a container 100. In addition, a positive electrode current collector 120, a negative electrode current collector 130, and an electrode body 140 are accommodated inside the container 100.

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

  The container 100 includes a container body 111 having a rectangular cylindrical shape and a bottom, and a lid body 110 that is a plate-like member that closes the opening of the container body 111. In addition, the container 100 can be hermetically sealed by, for example, welding the lid body 110 and the container body 111 after accommodating the electrode body 140 and the like therein. The material of the lid body 110 and the container body 111 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, or aluminum alloy.

  The electrode body 140 includes a positive electrode, a negative electrode, and a separator, and is a member that can store electricity. Specifically, the electrode body 140 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. In addition, in the same figure, although the ellipse shape was shown as a shape of the electrode body 140, circular shape or elliptical shape may be sufficient. The detailed configuration of the electrode body 140 will be described later.

  The positive electrode terminal 200 is an electrode terminal electrically connected to the positive electrode of the electrode body 140, and the negative electrode terminal 300 is an electrode terminal electrically connected to the negative electrode of the electrode body 140. In other words, the positive electrode terminal 200 and the negative electrode terminal 300 lead the electricity stored in the electrode body 140 to the external space of the power storage element 10, and in order to store the electricity in the electrode body 140, It is an electrode terminal made of metal for introducing. The positive electrode terminal 200 and the negative electrode terminal 300 are attached to the lid body 110 disposed above the electrode body 140.

  The positive electrode current collector 120 is disposed between the positive electrode of the electrode body 140 and the side wall of the container 100, and has a conductivity and rigidity that are electrically connected to the positive electrode terminal 200 and the positive electrode of the electrode body 140. It is. The positive electrode current collector 120 is made of the same material as the positive electrode of the electrode body 140, and is specifically formed of aluminum or an aluminum alloy.

  The negative electrode current collector 130 is disposed between the negative electrode of the electrode body 140 and the side wall of the container 100, and has a conductivity and rigidity that are electrically connected to the negative electrode terminal 300 and the negative electrode of the electrode body 140. It is. The negative electrode current collector 130 is made of the same material as the negative electrode of the electrode body 140, and is specifically formed of copper or a copper alloy.

  FIG. 3 is a view for explaining the structure of the electrode body 140. FIG. 4 is a perspective view showing the external appearance of the electrode body 140 and the insulating tape 150. FIG. 5 is a cross-sectional view of the electrode body 140 and the insulating tape 150. Specifically, FIG. 5A is a diagram showing an AA cross section of the electrode body 140 and the insulating tape 150 of FIG. 4, and FIG. 5B is a region of FIG. It is the enlarged view to which A1 was expanded.

  As shown in FIGS. 3 to 5, the electrode body 140 is formed by laminating and winding a positive electrode 141 and a negative electrode 142 each having an active material applied on the surface thereof, and separators 143 and 144. That is, the electrode body 140 is wound so that the cross section becomes an oval shape with the positive electrode 141, the first separator 143, the negative electrode 142, and the second separator 144 laminated in this order. It is formed. And as shown in FIG. 4, the outermost periphery (last one round) of the electrode body 140 formed by winding is a plurality of places (in this embodiment, in the winding axis direction of the electrode body). It is fixed by the insulating tape 150 at the position of two places.

  The positive electrode 141 is obtained by forming a positive electrode active material layer on the surface of a long belt-shaped positive electrode current collector foil made of aluminum or an aluminum alloy. In addition, the positive electrode 141 used for the electrical storage element 10 according to the present invention is not particularly different from those conventionally used, and those normally used can be used.

  The negative electrode 142 is obtained by forming a negative electrode active material layer on the surface of a long strip negative electrode current collector foil made of copper or a copper alloy. Note that the negative electrode 142 used in the electricity storage device 10 according to the present invention is not particularly different from those conventionally used, and those normally used can be used.

  The first separator 143 and the second separator 144 are long strip separators disposed between the positive electrode 141 and the negative electrode 142. The first separator 143 and the second separator 144 are heat-resistant coating separators each including a base material layer 143a, 144a and a particle-containing layer 143b, 144b.

  The base material layers 143a and 144a are microporous sheets made of a thermoplastic resin.

  The particle-containing layers 143b and 144b are layers different in material from the base material layers 143a and 144a, which are disposed on one surface of the base material layers 143a and 144a. In the present embodiment, the particle-containing layers 143b and 144b are layers coated on one surface of the base material layers 143a and 144a. Here, the particle-containing layers 143b and 144b are, for example, a heat-resistant layer containing a mixture of inorganic particles such as alumina and a binder such as polyvinylidene fluoride (PVdF) or a heat-resistant resin such as polydivinylbenzene (PDVB) or polyamide. Inorganic coating layer). Note that the particle-containing layers 143b and 144b may contain organic particles instead of inorganic particles. The particle-containing layers 143b and 144b may be disposed on both surfaces of the base material layers 143a and 144a.

  That is, each of the first separator 143 and the second separator 144 includes the base material layers 143a and 144a and the particle-containing layers 143b and 144b that are arranged on the base material layers 143a and 144a and include particles. The first separator 143 and the second separator 144 are laminated so that the particle-containing layers 143b and 144b face the positive electrode 141, and are laminated so that the base material layers 143a and 144a face the negative electrode 142.

  A winding core 145 made of polypropylene, polyethylene, or the like is disposed on the innermost periphery of the electrode body 140. The electrode body 140 is formed by winding the positive electrode 141, the first separator 143, the negative electrode 142, and the second separator 144 with the first separator 143 and the second separator 144 being welded and fixed to the core 145. Is done.

  Further, the outermost peripheral surface of the electrode body 140 (that is, the outermost peripheral surface) is constituted by the particle-containing layer 144b of the second separator 144 as shown in FIGS. That is, in the electrode body 140, the second separator 144 is wound around the outermost periphery of the electrode body 140 one or more times, and the outermost end 144c of the second separator 144 is directly connected to the other part of the second separator 144 itself. It is the structure which has overlapped.

  The insulating tape 150 is a long strip tape whose one side has adhesiveness (adhesiveness). Insulating tape 150 is wound on electrode body 140 along one or more turns along the outermost peripheral surface of electrode body 140, and a part of insulating tape 150 overlaps and is bonded to the other part of insulating tape 150. Are joined. Further, the insulating tape 150 is disposed such that the adhesive surface is in contact with the outermost peripheral surface of the electrode body 140. That is, the insulating tape 150 itself is formed in a ring shape along the outermost peripheral surface of the electrode body 140, thereby maintaining the state in which the electrode body 140 is wound.

  More specifically, the inner end 151 of the insulating tape 150 is disposed on the outermost end 144 c of the second separator 144 in the winding direction of the electrode body 140. The insulating tape 150 is configured such that the outer end 152 is bonded onto the inner end 151 in a state where the insulating tape 150 is wound once around the electrode body 140.

  Here, the end portion 144c on the outermost peripheral side of the second separator 144 is a portion in a region within a predetermined range R1 from the outermost end edge E1 of the second separator 144. Further, the predetermined range R1 is, for example, a range having a length that is one to two times the width W1 of the insulating tape 150. Here, if the width W1 of the insulating tape 150 is too thin, the insulating tape itself may be twisted or wound, and therefore the width W1 is preferably 5 to 50 mm, and more preferably 20 to 40 mm. More preferably. Moreover, by making the width | variety of an insulating tape into said numerical range, electrolyte solution becomes easy to osmose | permeate and it can suppress that an insulating tape is wound in the state which the wrinkle generate | occur | produced.

  The insulating tape 150 is disposed on both sides of the electrode body 140 in the winding axis direction. Specifically, the insulating tape 150 is located at a position where the distance L1 from the edge of the second separator 144 in the winding axis direction (that is, the X-axis direction) of the electrode body 140 is smaller than the width W1 of the insulating tape 150. Has been placed. That is, of the two insulating tapes 150, the insulating tape 150 arranged on the minus side in the X-axis direction has a distance L1 from the end on the minus side in the X-axis direction of the second separator 144 smaller than the width W1. The insulating tape 150 arranged on the plus side in the X-axis direction is at a position where the distance L1 from the edge on the plus side in the X-axis direction of the second separator 144 is smaller than the width W1. Has been placed.

  Further, the insulating tape 150 is wound in the same direction as the direction in which the positive electrode 141, the negative electrode 142, and the separators 143 and 144 that are components of the electrode body 140 are wound.

  FIG. 6 is a view for explaining the winding direction of the electrode body 140 and the insulating tape 150. Specifically, FIG. 6A is a diagram for explaining the winding direction when the electrode body 140 is formed, and FIG. 6B is a diagram illustrating the case where the insulating tape 150 is wound around the electrode body 140. It is a figure for demonstrating the winding direction when rotating.

  As shown in FIG. 6A, the electrode body 140 is formed by winding the positive electrode 141, the negative electrode 142, and the separators 143 and 144 counterclockwise when viewed from the positive side in the X-axis direction. ing. Also, as shown in FIG. 6B, the insulating tape 150 is formed by being wound counterclockwise around the electrode body 140 when viewed from the positive side in the X-axis direction. That is, as shown in FIGS. 6A and 6B, the winding direction in which the electrode body 140 is formed and the winding direction of the insulating tape 150 are the same direction.

  The winding direction may be defined as follows.

  When the wound object is traced from the inner position to the outer position of the wound object, the winding direction wound in the counterclockwise direction is the left direction and the clockwise direction It is good also considering the winding direction currently wound as a right direction.

  Moreover, you may define a winding direction by the direction of the circumferential direction in which the outermost edge (end surface) of the wound wound object has faced. That is, in the electrode body 140, the edge of the outermost second separator 144 of the wound wound product is in the left direction because it faces the left direction in the circumferential direction. Moreover, in the insulating tape 150, since the edge of the outermost insulating tape 150 of the wound wound object is facing the left direction of the circumferential direction, it becomes the left direction.

  As described above, according to the present embodiment, the insulating tape 150 is wound outside the insulating tape 150 which is a part of the electrode body 140 in a state where the electrode body 140 is wound one or more times along the outermost peripheral surface of the electrode body 140. The end portion 152 is bonded onto the inner end portion 151 which is another portion of the insulating tape 150 that is easily bonded. For this reason, since the insulating tape 150 can fix the outermost peripheral portion of the electrode body 140, the state in which the electrode body 140 is wound can be maintained. As a result, loosening of the wound electrode body 140 can be suppressed, and in the electricity storage device 10 employing the separators 143 and 144 provided with the particle-containing layers 143b and 144b which are heat-resistant layers, the performance degradation is reduced. Can be suppressed. Moreover, in the electrical storage element 10, since the performance degradation of the electrical storage element 10 can be suppressed even when the separators 143 and 144 provided with the particle-containing layers 143b and 144b, which are heat-resistant layers, are employed, Even if it is, safety can be ensured.

  Further, according to the present embodiment, the insulating tape 150 is wound in the same direction as the direction in which the electrode body 140 is wound. For this reason, when the insulating tape 150 is wound around the electrode body 140, it can be wound around the electrode body 140 one or more times while applying a tensile force to the outermost periphery of the electrode body 140. That is, the insulating tape 150 can be wound around the electrode body 140 while preventing the winding-type electrode body 140 from loosening when the insulating tape 150 is wound around the electrode body 140, and the electrode body 140 is wound. Can be maintained.

  Further, according to the present embodiment, the inner end 151 of the insulating tape 150 is disposed on the outermost end 144c of the second separator 144 in the winding direction. Therefore, when the insulating tape 150 is wound around the electrode body 140, the insulating tape 150 is held on the electrode body while holding the outermost end 144c of the second separator 144 (that is, the outermost end of the electrode body 140). One or more turns can be wound around 140. Thus, since the insulating tape 150 can be wound after the outermost end is pressed so that the electrode body 140 does not loosen, the electrode body 140 is wound so that the electrode body 140 does not loosen. Can be maintained.

  Further, according to the present embodiment, the insulating tape 150 is disposed on both sides of the electrode body 140 in the winding axis direction. Thus, since the insulating tape 150 does not cover the entire outermost peripheral surface of the electrode body 140, the permeability of the electrolytic solution to the electrode body 140 can be improved.

  In addition, according to the present embodiment, the insulating tape 150 is such that the distance L1 from the edge of the second separator 144 in the winding axis direction (X-axis direction) of the electrode body 140 is greater than the width W1 of the insulating tape 150. It is arranged at a position where it becomes smaller. For this reason, it can suppress that the edge part 144c of the outermost periphery of the electrode body 140 turns up. Thereby, the state in which the electrode body 140 is wound more firmly can be maintained.

(Modification 1)
In the electricity storage device 10 in the above embodiment, the inner end 151 of the insulating tape 150 is disposed on the outermost end 144c of the second separator 144 in the winding direction, but the present invention is not limited thereto.

  FIG. 7 is a perspective view showing the appearance of the electrode body 140 and the insulating tape 250 according to the first modification. FIG. 8 is a cross-sectional view of the electrode body 140 and the insulating tape 250 according to the first modification. Specifically, FIG. 8A is a diagram showing a cross section taken along the line B-B of the electrode body 140 and the insulating tape 250 of FIG. 7, and FIG. 8B is a region of FIG. It is the enlarged view to which A2 was expanded.

  As shown in FIGS. 7 and 8, in the electrode body 140 and the insulating tape 250 according to the first modification, the insulating tape 250 has an inner end portion 251 that is an outermost peripheral end of the outermost peripheral surface of the electrode body 140. It is disposed on the region 144d on the winding direction side of the portion 144c.

  Here, the region 144 d is a winding start region in the outermost peripheral surface of the electrode body 140. More specifically, the region 144d is a region adjacent to the outermost edge E1 of the second separator 144 on the winding direction side, and is a region within a predetermined range R2 from the edge E1. Further, the predetermined range R2 is, for example, a range having a length that is one to two times the width W1 of the insulating tape 250. In addition, since the structure of the electrode body 140 is the same as that of the electrode body 140 of embodiment, description is abbreviate | omitted.

  According to the electrode body 140 and the insulating tape 250 according to the first modification, the portion of the insulating tape 250 wound around the electrode body 140 one or more times and overlapping the insulating tape 250 itself is the outermost peripheral side of the electrode body 140. It can arrange | position in the area | region 144d of the winding direction side rather than the edge part 144c. In other words, a portion that is thicker than the other portion by overlapping the inner end portion 251 and the outer end portion 252 of the insulating tape 250 is a portion of the step generated by overlapping the outermost periphery of the electrode body 140. It can arrange | position in a site | part with a low height. For this reason, the structure of the assembly of the electrode body 140 and the insulating tape 250 can be made compact.

  Further, according to the electrode body 140 and the insulating tape 250 according to the first modification, the inner end portion 251 of the insulating tape 250 is on the same surface as the surface on which the outermost end portion 144c of the electrode body 140 is disposed. Can be placed adjacent to each other. For this reason, the insulating tape 250 can be wound around the electrode body 140 so that no step is generated in the insulating tape 250. Thereby, at least a portion where the insulating tape 250 is bonded to the insulating tape 250 itself can be made into a substantially flat state, and the state where the electrode body 140 is wound more firmly can be maintained.

(Modification 2)
In the above-described embodiment and its modifications, two insulating tapes 150 and 250 are provided on the electrode body 140. However, the configuration is not limited to two, and one insulating tape may be provided. Three or more configurations may be provided. Further, the insulating tapes 150 and 250 are positioned such that the distance L1 from the edge of the second separator 144 in the winding axis direction (X-axis direction) of the electrode body 140 is smaller than the width W1 of the insulating tapes 150 and 250. It may not be arranged. Further, the insulating tapes 150 and 250 may be insulating tapes having a wide width such as a width larger than half of the width of the second separator 144, for example.

(Modification 3)
In the above embodiment and its modifications, the insulating tapes 150 and 250 are tapes having adhesiveness (adhesiveness) on one side, but the entire surface may not have adhesiveness. Only the outer end of the insulating tape wound around one or more turns with respect to 140 only needs to have adhesiveness. For example, only the outer peripheral surface of the inner end of the insulating tape may have adhesiveness. Moreover, the insulating tape which both surfaces have adhesiveness may be employ | adopted.

(Modification 4)
In the said embodiment and its modification, although the 1st separator 143 and the 2nd separator 144 are each the heat-resistant coating separator provided with the base material layers 143a and 144a and the particle-containing layers 143b and 144b, A separator without the layers 143b and 144b may be used. Further, only one of the first separator and the second separator may have a particle-containing layer.

(Modification 5)
In the above-described embodiment and its modification, the insulating tape 150 is bonded by being partly overlapped and bonded to another part, but may be bonded by another bonding method such as welding. Good.

(Modification 6)
In the above-described embodiment and its modifications, the insulating tapes 150 and 250 are configured to be wound around the electrode body 140 once, but are configured to be wound around the electrode body 140 one or more times. May be.

(Modification 7)
In the above-described embodiment and its modification, the insulating tape insulating tapes 150 and 250 are configured such that the outer ends 152 and 252 are bonded to the surfaces on the inner ends 151 and 251. It is not limited to the configuration in which the electrodes are bonded to each other, and may not be bonded to the end portion of the insulating tape as long as the electrode body 140 is wound in a state of being wound one or more times.

(Modification 8)
In the said embodiment and its modification, although the insulating tapes 150 and 250 are the structures wound by the position of the X-axis direction with a fixed spiral shape also in the position where circumferential directions differ, it is not restricted to a spiral shape. In addition, a configuration may be adopted in which the position in the X-axis direction is different depending on the position in the circumferential direction and is spirally wound.

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

  A power storage element according to one embodiment of the present invention is useful as a power storage element that can suppress a decrease in performance in a configuration including an electrode body including a separator provided with a layer containing particles.

DESCRIPTION OF SYMBOLS 10 Storage element 100 Container 110 Cover body 111 Container main body 120 Positive electrode collector 130 Negative electrode collector 140 Electrode body 141 Positive electrode 142 Negative electrode 143 First separator 143a Base material layer 143b Particle-containing layer 144 Second separator 144a Base material layer 144b Particle Contained layer 144c End portion 144d Region 150, 250 Insulating tape 151, 251 Inner end portions 152, 252 Outer end portion 200 Positive electrode terminal 300 Negative electrode terminal E1 Edge R1, R2 Predetermined range W1 Width

Claims (6)

A power storage element comprising an electrode body formed by winding a positive electrode, a negative electrode, and a separator,
In the same direction as the direction in which the electrode body is wound, with one or more turns wound around the electrode body along the outermost peripheral surface of the electrode body, a part of the electrode body is overlapped with another part and joined. A power storage device comprising an insulating tape. The separator has a base material layer and a particle-containing layer containing particles,
The power storage device according to claim 1, wherein the particle-containing layer is disposed on an outermost peripheral surface of the electrode body. The electric storage element according to claim 1, wherein the insulating tape is disposed on both sides of the electrode body in a winding axis direction of the electrode body. The said insulating tape is arrange | positioned in the position where the distance from the edge of the said separator in the winding axis direction of the said electrode body becomes smaller than the width | variety of the said insulating tape. The electricity storage device described. The electric storage element according to any one of claims 1 to 4, wherein an inner end portion of the insulating tape is disposed on an outermost end portion in a winding direction of the electrode body. The end portion on the inner side of the insulating tape is disposed on a region on the winding direction side of the outermost peripheral surface with respect to the outermost peripheral end portion in the winding direction of the electrode body. 5. The electricity storage device according to any one of 4 above.

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