JP2010113869A - Energy storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an energy storage device easily forming an identification part without performing special processing and designing separately from an essential manufacture of the energy storage device, and facilitating an identification of a positive electrode connection terminal and a negative electrode connection terminal of the energy storage device by visual observation or the like. <P>SOLUTION: The energy storage device 1 includes: an outer packaging made of laminate films 40 and 50 for housing an energy storage element 10; and a positive electrode connection terminal 20 and a negative electrode connection terminal 30 electrically connected to a positive electrode and a negative electrode of the energy storage element 10, respectively, and protruding from the outer packaging. A positive electrode identification part 42 exists in the vicinity of a section, where the positive electrode connection terminal 20 projects, of the outer packaging by forming a part of an outer surface of the outer packaging in a protruding shape. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electricity storage device such as a lithium ion secondary battery, a lithium secondary battery, a polymer secondary battery, and an electric double layer capacitor.

  Conventionally, for example, in a power storage device such as a nonaqueous electrolyte battery having a configuration in which a power storage element is housed in an exterior body made of a laminate film, a positive electrode and a negative electrode connection terminal are formed in a form that is led out from the exterior body and protrudes. Has been. In order to discriminate between such a positive electrode connection terminal and a negative electrode connection terminal, it was necessary to print a mark of + mark, − mark, or a sticker on the base position of the external lead-out portion of the connection terminal. . However, if the surface where the mark is not printed or the surface where the sticker is not attached is facing upward, or if the battery is supplied to the production line without being unified, the positive connection terminal and the negative electrode There is a problem that it is difficult to visually distinguish between the connection terminals.

  Thus, a nonaqueous electrolyte battery that can easily and reliably determine the positive electrode and the negative electrode of the connection terminal of the nonaqueous electrolyte battery is disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-79240 (hereinafter referred to as Patent Document 1). Proposed in

  FIG. 12 is a perspective view showing an example of the nonaqueous electrolyte battery proposed in Patent Document 1. As shown in FIG.

  In the nonaqueous electrolyte battery 110 shown in FIG. 12, the battery body constituting the battery, that is, the power storage element 100 is tightly sealed in the exterior body 200 made of a laminate film. In the outer package 200, the power storage element 100 is accommodated in a protruding portion 500 having an inner shape corresponding to the outer shape of the power storage element 100, and is covered with a laminate film. One connecting terminal 400a connected to the positive electrode of the electricity storage element 100 and a connecting terminal 400b connected to the negative electrode are led out from the outer package 200 and protrude from the sealing portion 300 of the outer package 200.

In the nonaqueous electrolyte battery 110 configured as described above, as shown in FIG. 12, for example, the length La of the positive electrode connection terminal 400a is longer than the length Lb of the negative electrode connection terminal 400b. Thus, by making the length of the connection terminal portion different, it is easy to distinguish the positive electrode connection terminal and the negative electrode connection terminal of the battery. Moreover, in patent document 1, it makes it easy to discriminate | determine the connection terminal of the positive electrode of a battery, and a negative electrode by changing width and thickness other than the length of a connection terminal part.
JP 2004-79240 A

  In a conventional power storage device having a configuration in which a power storage element is accommodated in an outer package made of a laminate film, in order to distinguish both the positive electrode connection terminal and the negative electrode connection terminal by visual observation, a mark is provided separately from the original manufacturing of the power storage device. It was necessary to perform special processing such as printing or sticking a seal.

  In the nonaqueous electrolyte battery disclosed in Patent Document 1, the positive and negative connection terminals are identified visually. In the nonaqueous electrolyte battery disclosed in Patent Document 1, in order to be able to easily identify the difference between the positive electrode connection terminal and the negative electrode connection terminal by visual observation, the positive electrode connection is performed separately from the original production of the electricity storage device. It is necessary to perform a special design such as changing the shape of the connection terminal so that the difference in the length, width, and thickness of the connection terminal between the terminal and the negative electrode connection terminal becomes large.

  Accordingly, an object of the present invention is to provide an identification unit easily and without special processing or design, separately from the original manufacture of the electricity storage device, and the positive electrode connection terminal and the negative electrode connection terminal of the electricity storage device. It is an object of the present invention to provide an electricity storage device that can be easily identified by visual observation or the like.

  An electricity storage device according to the present invention includes an exterior body that houses an electricity storage element, and a positive electrode connection terminal and a negative electrode connection terminal that are electrically connected to the positive electrode and the negative electrode of the electricity storage element and project from the exterior body. In the vicinity of a portion of the exterior body where either the positive electrode connection terminal or the negative electrode connection terminal protrudes, a part of the outer surface of the exterior body is formed in a convex shape, so that a polarity identification portion exists.

  In the electricity storage device of the present invention, since the polarity identification part exists in the vicinity of the location of the exterior body from which either the positive electrode connection terminal or the negative electrode connection terminal protrudes, the positive electrode connection terminal and the negative electrode connection terminal of the electricity storage device Can be easily identified visually or the like.

  In addition, since the polarity identification part is configured by forming a part of the outer surface of the exterior body into a convex shape, molding for imparting an exterior shape such as a cup to the exterior body in order to accommodate the storage element In the process, the polarity identification part can be applied to the exterior body. For this reason, apart from the original manufacture of the electricity storage device, the polarity identification unit can be easily provided without any special processing or design.

  In order to effectively exhibit the above-described effects in the electricity storage device of the present invention, it is preferable that the polarity identification unit is a positive electrode side identification unit.

  In the electricity storage device of the present invention, at least one outer surface is formed in a convex shape at the location of the exterior body that accommodates the electricity storage element, so that the electricity storage element accommodation convex portion exists, and a relatively small area is provided. It is preferable that the positive electrode side identification part which it has is formed so that it may continue to the convex part for electrical storage element accommodation which has a comparatively large area | region.

  In this way, in the molding process for imparting the convex portion for storing the electricity storage element to the outer surface of the outer package, the positive electrode side identification unit can be easily formed by devising the mold shape for cup molding. It can be applied to the outer surface of. Further, since the positive electrode side identification portion having a relatively small area is formed so as to be continuous with the convex portion for storing the storage element having a relatively large area, the positive electrode side identification is performed in a form similar to a so-called dry battery form. The portion can be applied to the outer surface of the exterior body.

  Further, in the electricity storage device of the present invention, at least one outer surface is formed in a convex shape at the location of the exterior body that accommodates the electricity storage element, so that the electricity storage element accommodation convex portion exists and is relatively small. The positive electrode side identification part which has an area | region may be formed away from the convex part for electrical storage element accommodation which has a relatively large area | region.

  In this way, in the molding process for imparting the electricity storage element accommodating convex portion to the outer surface of the exterior body, the positive electrode side identification portion can be easily removed from the exterior body by devising the mold shape for cup molding. While being able to give to the surface, the discrimination power of a positive electrode side identification part can be improved by making a positive electrode side identification part exist independently from the convex part for electrical storage element accommodation.

  Furthermore, in the electricity storage device of the present invention, it is preferable that the positive electrode side identification unit is positioned on an extension line in a direction in which the positive electrode connection terminal extends.

  By doing so, the positive electrode side can be easily identified.

  Furthermore, in the electricity storage device of the present invention, it is preferable that the positive electrode side identification portion is positioned at the center in the width direction of the exterior body.

  By doing in this way, since the positive electrode side identification part is formed with the form similar to the form of what is called a dry cell, the positive electrode side can be identified easily.

  In the electricity storage device of the present invention, the positive electrode side identification portion may be positioned at a corner portion of the exterior body, not on an extension line in a direction in which the positive electrode connection terminal extends.

  In the electricity storage device according to the present invention, it is preferable that the width dimension of the positive electrode side identification portion is smaller than the width dimension of the positive electrode connection terminal.

  By doing in this way, an identification part can be provided to the outer surface of an exterior body by forming a comparatively small convex part, without depending on the magnitude | size of a positive electrode connection terminal.

  As described above, according to the present invention, apart from the original manufacture of the electricity storage device, the polarity identification part can be easily provided without performing special processing or design, and the positive electrode connection terminal and the negative electrode of the electricity storage device The connection terminals can be easily identified visually. Thereby, it is possible to easily identify the positive electrode side or the negative electrode side in the storage device manufacturing process and in the final product storage device. Therefore, it can prevent that the positive electrode and negative electrode of an electrical storage device are connected reversely.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 is a perspective view showing an electricity storage device as Embodiment 1 of the present invention, FIG. 2 is an end cross-sectional view seen from the direction of II-II line in FIG. 1, and FIG. 3 is from the direction of III-III line in FIG. FIG.

  As shown in FIG. 1 to FIG. 3, the electricity storage device 1 is electrically connected to an exterior body composed of two upper and lower laminate films 40 and 50 that house the electricity storage element 10, and each of the positive electrode and the negative electrode of the electricity storage element 10. And a positive electrode connection terminal 20 and a negative electrode connection terminal 30 protruding from the outer package. The power storage element 10 is configured, for example, by laminating or winding a positive electrode member to which an active material made of a lithium metal oxide is attached, a separator member, and a negative electrode member to which an active material made of a carbon material is attached. Has been. Each of the laminate films 40 and 50 has, for example, a three-layer structure of an outer surface layer made of nylon (registered trademark), an intermediate layer made of aluminum foil, and an inner surface layer made of polypropylene. The positive electrode connection terminal 20 and the negative electrode connection terminal 30 are made of, for example, the same aluminum or an alloy thereof.

  The heat seal part 60 is formed by welding the inner surface layers which the outer peripheral parts 45 and 55 of the two laminated films 40 and 50 oppose in the peripheral part of an exterior body. The positive electrode connection terminal 20 and the negative electrode connection terminal 30 are led out from the heat seal portion 60 and protruded.

  The central portion, which is the location of the exterior body that houses the electricity storage element 10, has a relatively large area by forming the outer surface on one side, in this Embodiment 1, the outer surface on the upper side in a convex shape. There is a convex portion 41 for accommodating a power storage element. The power storage element accommodating convex portion 41 may be configured by forming the upper and lower outer surfaces in a convex shape.

  In the vicinity of the location of the exterior body from which the positive electrode connection terminal 20 protrudes, a part of the exterior surface of the exterior body is formed in a convex shape, so that a positive-side identification portion 42 having a relatively small area exists. . The positive-side identification part 42 is surrounded by a protruding or convex peripheral part 43 and the peripheral part 43 and is recessed so as to come into contact with the positive connection terminal 20 or to contact with the positive connection terminal 20. It consists of a central part 44. The positive electrode side identification part 42 is formed so as to be continuous with the convex part 41 for housing the electricity storage element. In addition, the peripheral part 43 and the center part 44 are formed when vacuuming the periphery four sides of an exterior body. Until the four sides around the exterior body are vacuum-sealed, the peripheral edge portion 43 and the central portion 44 are connected to the flat surface of the storage element housing convex portion 41 and are in a flat state. In this embodiment, the recessed central portion 44 is in contact with the positive electrode connection terminal 20 as shown in FIGS. 2 and 3, but an insulating member such as an insulating tape or an active material layer is connected to the central portion 44. By being interposed between the positive electrode connection terminal 20 and the positive electrode connection terminal 20, it may be located away from the surface of the positive electrode connection terminal 20. Moreover, the positive electrode side identification part 42 is located on the extension line | wire of the direction where the positive electrode connection terminal 20 is extended. Furthermore, the positive electrode side identification part 42 is located in the center part of the width direction of an exterior body. The width dimension of the positive electrode side identification part 42 is smaller than the width dimension of the positive electrode connection terminal 20.

  In the first embodiment, the positive electrode connection terminal 20 protrudes so as to extend from one side portion of the opposite side portions of the outer package body, and the negative electrode connection terminal 30 is formed on both side portions of the outer package body facing each other. It protrudes so that it may extend from the other side part.

  In the electricity storage device 1 according to the first embodiment configured as described above, the positive electrode side identification unit 42 exists near the portion of the exterior body from which the positive electrode connection terminal 20 protrudes. The terminal 20 and the negative electrode connection terminal 30 can be easily identified visually.

  Moreover, since the positive electrode side identification part 42 is comprised because a part of outer surface of an exterior body is formed in convex shape, in order to accommodate the electrical storage element 10, external shapes, such as a cup, are provided to an exterior body. In the molding process, the positive electrode side identification portion 42 can be simultaneously applied to the exterior body by a mold. For this reason, apart from the original manufacture of the electrical storage device 1, the positive electrode side identification part 42 can be easily provided, without performing a special process and design.

  Further, at the location of the exterior body that houses the electricity storage element 10, the outer surface on at least one side is formed in a convex shape so that the electricity storage element accommodation convex portion 41 exists and has a relatively small area. The identification part 42 is formed so as to be continuous with the convex part 41 for storing a power storage element having a relatively large area. As a result, in the molding process for imparting the storage element housing convex portion 41 to the outer surface of the exterior body, the positive electrode side identification portion 42 can be easily removed from the exterior body by devising the mold shape for cup molding. It can be applied to the surface. In addition, since the positive electrode side identification portion 42 having a relatively small area is formed so as to be continuous with the convex portion 41 for housing a storage element having a relatively large area, the positive electrode in a form similar to that of a so-called dry battery. The side identification part 42 can be provided on the outer surface of the exterior body.

  Furthermore, the positive electrode side identification part 42 can be easily identified by being positioned on the extension line in the direction in which the positive electrode connection terminal 20 extends. Since the positive electrode side identification part 42 is formed in a form similar to that of a so-called dry battery by positioning the positive electrode side identification part 42 in the center part in the width direction of the exterior body, the positive electrode side can be easily identified. Can do.

  In addition, since the width dimension of the positive electrode side identification part 42 is smaller than the width dimension of the positive electrode connection terminal 20, the identification part is formed by forming a relatively small convex part without depending on the size of the positive electrode connection terminal 20. Can be applied to the outer surface of the exterior body.

  In the above embodiment, the example in which the polarity identification unit of the present invention is the positive electrode side identification unit has been described, but the polarity identification unit of the present invention may be formed as the negative electrode side identification unit. In this case, for example, in FIG. 1, the negative electrode side identification unit is configured such that a part of the outer surface of the outer package is formed in a convex shape near the portion of the outer package from which the negative electrode connection terminal 30 protrudes. It may be formed so as to be continuous with the element accommodating convex portion 41 and may be formed at two locations on both ends in the width direction of the exterior body.

  In addition, the positive electrode side identification portion or the negative electrode side identification portion configured by forming a part of the outer surface of the exterior body into a convex shape acts as a place for collecting gas generated inside the exterior body during the manufacturing process. May be. In this case, it is possible to prevent accidents in the manufacturing process by collecting gas in the positive electrode side identification part or the negative electrode side identification part.

(Embodiment 2)
4 is a plan view showing an electricity storage device as Embodiment 2 of the present invention, FIG. 5 is an end cross-sectional view as seen from the direction of line V-V in FIG. 4, and FIG. 6 is from the direction of line VI-VI in FIG. FIG.

  As shown in FIGS. 4 to 6, in the electricity storage device 2 of the second embodiment, at least one side outer surface is formed in a convex shape at the location of the exterior body that houses the electricity storage element 10. The accommodating convex part 41 exists, and the positive electrode side identification part 42 having a relatively small area is formed apart from the accumulating element accommodating convex part 41 having a relatively large area.

  In this way, in the molding process for imparting the electricity storage element accommodating convex portion 41 to the outer surface of the exterior body, the positive electrode side identification portion 42 can be easily formed by devising the mold shape for cup molding. In addition, the positive electrode side identification portion 42 can be provided independently of the power storage element accommodation convex portion 41, whereby the discrimination power of the positive electrode side identification portion 42 can be improved.

  Since other configurations are the same as those of the electricity storage device 1 of the first embodiment, the same functions and effects as those of the first embodiment can be obtained by the same components.

(Embodiment 3)
7 is a plan view showing an electricity storage device as Embodiment 3 of the present invention, FIG. 8 is an end cross-sectional view as seen from the direction of line VIII-VIII in FIG. 7, and FIG. 9 is from the direction of line IX-IX in FIG. FIG.

  As shown in FIGS. 7-9, in the electrical storage device 3 of this Embodiment 3, the positive electrode connection terminal 20 and the negative electrode connection terminal 30 are extended in parallel from one side part among the both sides of the exterior body which mutually oppose, respectively. So that it protrudes. Moreover, the positive electrode side identification part 42 is located on the extension line | wire of the direction where the positive electrode connection terminal 20 is extended. Furthermore, the positive electrode side identification part 42 is positioned on one side in the width direction of the exterior body, that is, on the positive electrode connection terminal 20 side. As shown in FIGS. 7 and 8, the width dimension of the positive electrode side identification unit 42 is substantially the same as the width dimension of the positive electrode connection terminal 20, but may be larger or smaller than the width dimension of the positive electrode connection terminal 20. .

Further, in the electricity storage device 3 of the third embodiment, similarly to the electricity storage device 2 of the second embodiment,
A positive electrode side identification portion having a relatively small region, in which the outer surface on at least one side is formed in a convex shape at the location of the exterior body that houses the power storage element 10, so that the power storage element housing convex portion 41 exists. 42 is formed separately from the convex portion 41 for storing the electricity storage element having a relatively large region.

  Thus, even when the positive electrode connection terminal 20 and the negative electrode connection terminal 30 protrude so as to extend in parallel from the same side of the outer package, the storage element housing convex portion 41 is provided on the outer surface of the outer package. In the molding process, the positive electrode side identification part 42 can be easily applied to the outer surface of the exterior body by devising the mold shape for cup molding, and the positive electrode side identification part 42 is accommodated in the electricity storage element. By making it exist independently from the convex part 41 for use, the discrimination power of the positive electrode side discrimination part 42 can be improved.

  Since other configurations are the same as those of the electricity storage device 1 of the first embodiment, the same effects as those of the first embodiment can be obtained by the same components.

(Embodiment 4)
FIG. 10 is a plan view showing an electricity storage device as Embodiment 4 of the present invention.

  As shown in FIG. 10, in the electricity storage device 4 of the fourth embodiment, the positive electrode side identification unit 42 is positioned not on the extension line in the direction in which the positive electrode connection terminal 20 extends, but on the corner of the exterior body.

  Even in this case, since the other configuration is the same as that of the electricity storage device 2 of the second embodiment, the same effects as those of the second embodiment can be obtained by the same components.

(Embodiment 5)
FIG. 11 is a plan view showing an electricity storage device as Embodiment 5 of the present invention.

  As shown in FIG. 11, in the electricity storage device 5 of the fifth embodiment, the positive electrode connection terminal 20 and the negative electrode connection terminal 30 each protrude so as to extend in parallel from one side portion of both side portions of the facing body facing each other. ing. The positive electrode side identification part 42 is positioned not at the extension line in the direction in which the positive electrode connection terminal 20 extends but at the corner of the exterior body.

  Even in this case, since the other configuration is the same as that of the electricity storage device 3 of the third embodiment, the same effects as those of the third embodiment can be obtained by the same components.

  It should be considered that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is shown not by the above embodiments but by the scope of the claims, and is intended to include all modifications and variations within the meaning and scope equivalent to the scope of the claims.

It is a perspective view which shows the electrical storage device as Embodiment 1 of this invention. It is the end surface sectional view seen from the direction of II-II line of FIG. It is sectional drawing seen from the direction of the III-III line of FIG. It is a top view which shows the electrical storage device as Embodiment 2 of this invention. It is the end surface sectional view seen from the direction of the VV line of FIG. It is sectional drawing seen from the direction of the VI-VI line of FIG. It is a top view which shows the electrical storage device as Embodiment 3 of this invention. It is the end surface sectional view seen from the direction of a VIII-VIII line of FIG. It is sectional drawing seen from the direction of the IX-IX line of FIG. It is a top view which shows the electrical storage device as Embodiment 4 of this invention. It is a top view which shows the electrical storage device as Embodiment 5 of this invention. It is a perspective view which shows an example of the nonaqueous electrolyte battery proposed by patent document 1. FIG.

Explanation of symbols

1, 2, 3, 4, 5: power storage device, 10: power storage element, 20: positive electrode connection terminal, 30: negative electrode connection terminal, 40, 50: laminate film, 41: convex part for storing power storage element, 42: positive electrode side Identification part.

Claims (8)

An exterior body that houses a power storage element;
Electrically connected to each of the positive electrode and the negative electrode of the electricity storage element, comprising a positive electrode connection terminal and a negative electrode connection terminal protruding from the outer package,
In the vicinity of the portion of the exterior body from which either the positive electrode connection terminal or the negative electrode connection terminal protrudes, a polarity identifying portion exists by forming a part of the outer surface of the exterior body into a convex shape. The electricity storage device.   The electricity storage device according to claim 1, wherein the polarity identification unit is a positive electrode side identification unit.   The positive electrode side identification portion having a relatively small region in which the outer surface of at least one side is formed in a convex shape at the location of the exterior body that stores the power storage element, thereby having a power storage element housing convex portion. The electrical storage device according to claim 2, wherein the electrical storage device is formed so as to be continuous with the convex part for storing electrical storage elements having a relatively large area.   The positive electrode side identification portion having a relatively small region in which the outer surface of at least one side is formed in a convex shape at the location of the exterior body that houses the power storage element, thereby having a power storage element housing convex portion. The electricity storage device according to claim 2, wherein the electricity storage device is formed apart from the electricity storage element accommodation convex portion having a relatively large area.   The power storage device according to any one of claims 2 to 4, wherein the positive electrode side identification section is positioned on an extension line in a direction in which the positive electrode connection terminal extends.   The electricity storage device according to claim 5, wherein the positive electrode side identification portion is positioned at a center portion in a width direction of the exterior body.   The said positive electrode side identification part is not on the extension line | wire of the direction where the said positive electrode connection terminal extends, but is located in the corner part of the said exterior body, The statement of any one of Claim 2 to 4 Power storage device.   The power storage device according to any one of claims 2 to 7, wherein a width dimension of the positive electrode side identification portion is smaller than a width dimension of the positive electrode connection terminal.

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