JP2015176789A - Nonaqueous electrolyte secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery which allows for diversification of application, while stabilizing the position of an electrode body stably.SOLUTION: A nonaqueous electrolyte secondary battery (1) includes an electrode body (15) having a positive electrode and a negative electrode and an exterior can (10). The exterior can (10) includes an electrode housing region (10A) for housing the electrode body (15), and an electrode body regulation region (10B) where the dimension, in the thickness direction, of the electrode body (15) housed in the electrode housing region (10A) is smaller than the thickness of the electrode body (15). The exterior can (10) has first and second sidewalls (111, 121) which are arranged to face each other, in the thickness direction of the electrode body (15) housed in the electrode housing region (10A), and at least parts of which are included in the electrode housing region (10A). At least one of the first and second sidewalls (111, 121) includes a bent shape, on the outer surface of the part included in the electrode housing region (10A).

Description

  The present invention relates to a non-aqueous electrolyte secondary battery.

  In recent years, with the spread of thin portable devices, the demand for thin batteries has increased. Further, in response to the development of various portable devices, a battery that can be used for various purposes is demanded.

  For example, Patent Document 1 discloses a battery that can be mounted in a curved space of an electronic device by bending a battery element and a battery case.

  Patent Document 2 discloses a technique for curving a side wall portion of a casing in a battery used for a medical device disposed in a human body in order to match the shape of the casing that houses the wound cell stack with the body shape. ing.

  Patent Document 3 discloses a lithium ion secondary battery in which a metal laminate exterior body that accommodates a battery body is curved in order to increase the degree of freedom in designing a device to which the lithium ion secondary battery is applied. ing.

  Patent Document 4 discloses a lithium battery having a curved shape and housed in a shaver.

  Patent Document 5 discloses a secondary battery that is applied to an electronic device having a curved surface by bending a battery case that houses an electrode assembly.

JP 2002-170538 A Japanese Patent No. 4377570 JP 2004-241250 A JP 2005-501385 gazette JP 2012-151110 A

  By the way, in the battery as described in each said patent document, it is necessary to provide the space for connecting the electrode of an electrode body, and an external terminal inside the case which accommodates an electrode body. Along with this, there is a possibility that the position of the electrode body is shifted inside the case.

  Therefore, an object of the present invention is to provide a non-aqueous electrolyte secondary battery that can be used for various purposes and can stably hold the position of the electrode body.

  This invention is for solving the said subject, The electrode body containing a positive electrode and a negative electrode, The electrode body accommodation area | region which accommodates an electrode body, The thickness of the electrode body accommodated in the electrode body accommodation area | region An outer can including an electrode body regulating region having a portion whose dimension in the direction is smaller than the thickness of the electrode body. The outer can is arranged to face each other in the thickness direction of the electrode body housed in the electrode body housing area, and has first and second side wall portions at least partially included in the electrode body housing area. At least one of the first and second side wall portions includes a bent shape on the outer surface of the portion included in the electrode body accommodation region.

  In the non-aqueous electrolyte secondary battery, the first side wall and / or the second side wall of the outer can includes a bent shape on an outer surface of a portion included in the electrode body housing region. According to this configuration, since the batteries can be arranged in various shaped spaces, it is possible to diversify the usage of the batteries. The “bending shape” in the present invention means a shape in which the orientation of the surface changes, and not only a curved shape in which the orientation of the surface changes smoothly but also a bent shape in which the orientation of the surface changes at an angle. Including.

  Further, in the nonaqueous electrolyte secondary battery, the outer can includes an electrode body regulating region having a portion in which the dimension in the thickness direction of the electrode body housed in the electrode body housing region is smaller than the thickness of the electrode body. . By this electrode body regulating region, the movement of the electrode body within the outer can can be regulated, and the position of the electrode body can be stably maintained.

  In the non-aqueous electrolyte secondary battery, the outer can includes a first side wall portion, a concave first member having an opening on a surface opposite to the first side wall portion, a second side wall portion, and the first member. And a second member that seals the opening. The surface of the first member opposite to the first side wall, that is, one surface in the thickness direction of the electrode body is opened. According to this configuration, as compared with the case where the surface in the height direction or the width direction of the first member is opened, deep drawing processing is not necessary, and thus processing is facilitated.

  The first member may be formed such that the peripheral edge of the opening is located on the same plane over the entire circumference. According to this configuration, the first member and the second member that seals the opening of the first member can be easily joined.

  The non-aqueous electrolyte secondary battery may further include a terminal provided in the electrode body regulating region on the outer surface of the outer can and electrically connected to the positive electrode or the negative electrode. By disposing the terminal in the electrode body regulating region, the nonaqueous electrolyte secondary battery can be made compact.

  In the nonaqueous electrolyte secondary battery, the outer can is further connected to the first side wall through a step, and in the electrode body regulating region, the third can be disposed closer to the second side than the first side. You may have a side wall part. According to this structure, since the 3rd side wall part which comprises at least one part of an electrode body control area | region is arrange | positioned inside a 1st side wall part, a nonaqueous electrolyte secondary battery can be made compact.

  The outer surface of the third side wall portion may be formed in a planar shape. According to this configuration, components such as terminals can be easily provided on the outer surface of the third side wall.

  The third side wall portion may have at least a part of its outer surface curved. According to this configuration, in the outer can, the curved portion is present not only in the first and / or second side wall portion but also in the third side wall portion, so that further diversification of battery applications can be achieved.

  In the non-aqueous electrolyte secondary battery, at least one of the first and second side wall portions may be formed such that a cross section along the thickness direction of the electrode body accommodated in the electrode body accommodating region is arcuate. Good. By curving at least one of the first and second side walls as a whole, the nonaqueous electrolyte secondary battery can be made compact.

  The first and second side wall portions may be formed such that a cross section along the thickness direction of the electrode body housed in the electrode body housing region has an arc shape projecting in the same direction. The nonaqueous electrolyte secondary battery can be made more compact by curving both the first and second side wall portions in the same direction.

  ADVANTAGE OF THE INVENTION According to this invention, while diversifying the use of a nonaqueous electrolytic secondary battery, the position of the electrode body in a battery can be hold | maintained stably.

FIG. 1 is a perspective view showing a schematic configuration of the nonaqueous electrolyte secondary battery according to the first embodiment of the present invention. FIG. 2 is an exploded perspective view of the nonaqueous electrolyte secondary battery shown in FIG. 3 is a III-III cross-sectional view of the nonaqueous electrolyte secondary battery shown in FIG. FIG. 4 is a IV-IV cross-sectional view of the nonaqueous electrolyte secondary battery shown in FIG. FIG. 5 is a plan view of the nonaqueous electrolyte secondary battery shown in FIG. 6 is a VI-VI cross-sectional view of the nonaqueous electrolyte secondary battery shown in FIG. FIG. 7 is a perspective view showing a schematic configuration of the nonaqueous electrolyte secondary battery according to the second embodiment of the present invention. 8 is a VIII-VIII cross-sectional view of the nonaqueous electrolyte secondary battery shown in FIG. FIG. 9 is a perspective view illustrating a schematic configuration of a nonaqueous electrolyte secondary battery according to a modification of the second embodiment. FIG. 10 is a vertical sectional view showing a schematic configuration of a nonaqueous electrolyte secondary battery according to a modification of each embodiment. FIG. 11A is a perspective view illustrating a schematic configuration of a nonaqueous electrolyte secondary battery according to a modification of each embodiment. FIG. 11B is a plan view of the nonaqueous electrolyte secondary battery shown in FIG. 11A. FIG. 12A is a perspective view illustrating a schematic configuration of a nonaqueous electrolyte secondary battery according to a modification of each embodiment. 12B is a plan view of the nonaqueous electrolyte secondary battery shown in FIG. 12A. FIG. 13A is a perspective view illustrating a schematic configuration of a nonaqueous electrolyte secondary battery according to a modification of each embodiment. FIG. 13B is a plan view of the nonaqueous electrolyte secondary battery shown in FIG. 13A. FIG. 14A is a perspective view illustrating a schematic configuration of a nonaqueous electrolyte secondary battery according to a modification of each embodiment. 14B is a plan view of the nonaqueous electrolyte secondary battery shown in FIG. 14A.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, about the same or equivalent structure, the same code | symbol is attached | subjected and the same description is not repeated.

[First Embodiment]
First, a first embodiment of the present invention will be described.

<< Configuration of nonaqueous electrolyte secondary battery >>
As shown in FIGS. 1 and 2, the nonaqueous electrolyte secondary battery 1 according to the first embodiment includes an outer can 10, a positive terminal 13, a negative terminal 14, an electrode body 15, an electrolyte (not shown). ) And.

  For convenience of explanation, the x direction, the y direction, and the z direction are determined along the outer shape of the outer can 10 as shown in FIG. Hereinafter, the x direction may be referred to as the width direction, the y direction as the thickness direction, and the z direction as the height direction. The nonaqueous electrolyte secondary battery 1 is a flat battery having a thickness dimension smaller than a width dimension or a height dimension. Further, the upper and lower portions in FIG. 1 may be simply referred to as upper and lower portions.

<Exterior can>
As shown in FIG. 2, the outer can 10 has a first member 11 and a second member 12 and accommodates the electrode body 15. More specifically, as shown in FIG. 3, the outer can 10 includes an electrode body housing area 10 </ b> A that houses the electrode body 15, and an electrode body regulation in which the thickness direction dimension t <b> 1 is smaller than the thickness te of the electrode body 15. Region 10B. More specifically, the dimension t1 is the distance between the inner surface of the first member 11 and the inner surface of the second member 12 in the electrode body regulating area 10B, that is, the inner dimension of the outer can 10 in the electrode body regulating area 10B. is there.

  As shown in FIGS. 2 and 3, the first member 11 includes a first side wall 111. The surface of the first member 11 opposite to the first side wall 111 is open in the thickness direction. When viewed from the thickness direction, the area of the opening of the first member 11 is larger than the area of the electrode body 15. The second member 12 includes a second side wall 121 and seals the opening of the first member 11. The first member 11 and the second member 12 are joined by, for example, seam welding.

  The first member 11 and the second member 12 are made of, for example, aluminum or an aluminum alloy.

(First member)
As shown in FIG. 3, the first member 11 is formed in a concave shape. The first member 11 includes a first side wall 111, a third side wall 113 connected to the first side wall 111, and a peripheral wall provided so as to surround the first side wall 111 and the third side wall 113. Part 112.

  The outer surface of the first side wall 111 includes a bent shape. More specifically, as shown in FIG. 4, the first side wall 111 has a cross section (cross section in the xy direction) along the thickness direction of the electrode body 15 in the outer can 10 protruding toward the second member 12 side. It is formed to form an arc shape. Thereby, the outer surface of the 1st side wall part 111 curves entirely. The first side wall 111 is included in the electrode body housing region 10A (FIG. 3).

  The third side wall 113 is connected to the first side wall 111 through the step 114 and is disposed closer to the second side wall 121 described later than the first side wall 111. Therefore, the 3rd side wall part 113 is contained in the above-mentioned electrode body control area | region 10B (FIG. 3). As shown in FIGS. 4 and 5, the outer surface of the third side wall 113 is a plane that is substantially perpendicular to the thickness direction.

  As shown in FIG. 5, the positive electrode terminal 13 and the negative electrode terminal 14 (FIG. 1) are disposed on the outer surface of the third side wall portion 113. As will be described in detail later, the positive terminal 13 is electrically connected to the outer can 10, and the negative terminal 14 is electrically insulated from the outer can 10. The third side wall portion 113 is formed with a through hole 1112a and a through hole 1112b (FIG. 6) for supporting the positive electrode terminal 13 and the negative electrode terminal 14, respectively.

  As shown in FIG. 3, the sum t2 of the thickness of the outer can 10 where the negative electrode terminal 14 is disposed and the thickness of the portion where the negative electrode terminal 14 protrudes from the outer can 10 is the maximum thickness of the outer can 10. t3 or less. For this reason, when the nonaqueous electrolyte secondary battery 1 is viewed from the side (width direction), the negative electrode terminal 14 does not protrude from the outer surface of the first side wall 111. Thereby, the nonaqueous electrolyte secondary battery 1 is comprised compactly, and the short circuit with the armored can 10 and the negative electrode terminal 14 is suppressed. In addition, although illustration is abbreviate | omitted, the sum of the thickness of the exterior can 10 of the part in which the positive electrode terminal 13 is arrange | positioned, and the thickness of the part which the positive electrode terminal 13 protruded from the exterior can 10 is the maximum of the exterior can 10 similarly. The thickness is not more than t3.

  As shown in FIGS. 3 and 4, the peripheral wall 112 is continuous with the first side wall 111 and the third side wall 113, and is provided so as to surround the first side wall 111 and the third side wall 113. As shown in FIG. 5, the end of the peripheral wall 112 on the second member 12 side, that is, the peripheral edge of the opening of the first member 11 extends in the direction (xz direction) perpendicular to the thickness direction over the entire periphery. It is located on one spreading plane. For this reason, in the peripheral wall portion 112, the dimension in the thickness direction of the portion continuing to the third sidewall portion 113 is smaller than the dimension in the thickness direction of the portion continuing to the first sidewall portion 111. Note that the outer peripheral portion of the third side wall portion 113 may also serve as a part of the peripheral wall portion 112 in accordance with the position, size, and the like of the third side wall portion 113 in the thickness direction.

(Second member)
As shown in FIG. 3, the second member 12 includes a second side wall 121, and an upper wall 122 and a bottom wall 123 that are continuous with the second side wall 121.

  As shown in FIG. 3, the second side wall 121 is arranged to face the first side wall 111 of the first member 11 in the thickness direction. The second side wall 121 extends in the height direction across the electrode body housing area 10A and the electrode body regulating area 10B. That is, a part of the second side wall 121 is included in the electrode body housing region 10A, and the other part of the second side wall 121 is included in the electrode body regulating region 10B.

  The outer surface of the second side wall 121 includes a bent shape. In the present embodiment, the outer surface of the second side wall 121 is entirely curved. More specifically, as shown in FIG. 4, the second side wall 121 has a cross section (cross section in the xy direction) along the thickness direction of the electrode body 15 in the outer can 10 on the side opposite to the first member 11. It is formed so as to form a protruding arc shape. That is, the cross section of the 2nd side wall part 121 and the 1st side wall part 111 of the xy direction makes the circular arc shape which protrudes in the same direction.

  As shown in FIG. 3, the upper wall portion 122 and the bottom wall portion 123 are continuous with the upper end portion and the lower end portion of the second side wall portion 121, respectively. The upper wall portion 122 and the bottom wall portion 123 are provided at the upper and lower end portions of the second side wall portion 121 so as to close a gap in the thickness direction that is generated when the xy section of the second side wall portion 121 is arcuate. A peripheral portion of the second member 12 is configured by the end portions on the first member 11 side of the upper wall portion 122 and the bottom wall portion 123 and both end portions in the width direction of the second side wall portion 121. The peripheral edge portion of the second member 12 is positioned on one plane extending in a direction perpendicular to the thickness direction (xz direction). The peripheral edge of the second member 12 is joined to the peripheral edge of the opening of the first member 11, thereby forming a sealed space in the outer can 10.

<Positive electrode terminal>
As shown in FIG. 6, the positive electrode terminal 13 includes a first material layer 131 and a second material layer 132. The first material layer 131 includes a flat surface portion 131A and a boss portion 131B. The positive electrode terminal 13 is fixed to the outer can 10 by press-fitting the boss portion 131B into the through hole 1112a and welding the peripheral edge of the flat portion 131A and the outer can 10 (first member 11).

  The positive electrode terminal 13 is, for example, a clad material in which a first material layer 131 and a second material layer 132 are pressed. In the positive electrode terminal 13, for example, the first material layer 131 is formed of aluminum or an aluminum alloy, and the second material layer 132 is formed of nickel or a nickel alloy.

  The positive electrode lead tab 151 is welded to the outer can 10 (first member 11). With this configuration, the positive electrode of the electrode body 15 (FIG. 2) and the positive electrode terminal 13 are electrically connected via the outer can 10 (first member 11).

<Negative terminal>
As shown in FIG. 6, the negative electrode terminal 14 includes a flat surface portion 14A and a boss portion 14B. Around the negative electrode terminal 14, a gasket 141, an insulating plate 142, and a pressing plate 143 are disposed. The boss portion 14B of the negative electrode terminal 14 is inserted into the through hole 1112b with the gasket 141 interposed therebetween. The negative electrode terminal 14 is fixed to the pressing plate 143 by inserting the tip of the boss portion 14B into the hole 143a formed in the pressing plate 143 and then caulking the tip of the boss portion 14B. An insulating plate 142 is disposed between the holding plate 143 and the outer can 10 (first member 11) to insulate the holding plate 143 and the outer can 10 (first member 11).

  The negative electrode terminal 14 is made of, for example, copper or copper plated with nickel. The pressing plate 143 is made of copper, for example. The gasket 141 and the insulating plate 142 are, for example, resin molded products.

  The negative electrode lead tab 152 is welded to the holding plate 143. With this configuration, the negative electrode of the electrode body 15 (FIG. 2) and the negative electrode terminal 14 are electrically connected via the pressing plate 143.

<Electrode body>
The electrode body 15 (FIG. 2) is obtained by winding a belt-like positive electrode and a belt-like negative electrode with a separator in between and compressing it in the thickness direction into a flat shape. A positive electrode lead tab 151 is connected to the positive electrode, and a negative electrode lead tab 152 is connected to the negative electrode.

  Although a positive electrode, a negative electrode, a separator, and electrolyte solution are not specifically limited, If it illustrates, it will be as follows.

  In the positive electrode, a positive electrode mixture layer is formed on one side or both sides of a belt-like positive electrode current collector. The positive electrode current collector is formed of, for example, a foil such as aluminum or titanium, a plain woven wire net, an expanded metal, a lath net, or a punching metal.

  The positive electrode mixture layer is formed by mixing a positive electrode active material, a conductive additive, and a binder. As the positive electrode active material, lithium manganate, lithium nickel composite oxide, lithium cobalt composite oxide, lithium nickel cobalt composite oxide, vanadium oxide, molybdenum oxide, or the like can be used. As the conductive assistant, graphite, carbon black, acetylene black, or the like can be used. As the binder, polyimide, polyamideimide, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), or the like can be used alone or in combination.

  The negative electrode is one in which a negative electrode mixture layer is formed on one side or both sides of a strip-shaped negative electrode current collector. The negative electrode current collector is formed of, for example, a foil such as copper, nickel, or stainless steel, a plain woven wire net, an expanded metal, a lath net, or a punching metal.

  The negative electrode mixture layer is formed by mixing a negative electrode active material and a binder. As the negative electrode active material, natural graphite, mesophase carbon, amorphous carbon, or the like can be used. As the binder, celluloses such as carboxymethyl cellulose (CMC) and hydroxypropyl cellulose (HPC), rubber binders such as styrene butadiene rubber (SBR) and acrylic rubber, PTFE, PVDF and the like can be used alone or in combination.

  The separator is formed of a porous film or a non-woven fabric such as polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or polyphenyl sulfide (PPS).

<Electrolyte>
The electrolytic solution is a solution in which a lithium salt is dissolved in an organic solvent. As an organic solvent, vinylene carbonate (VC), propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (MEC), or γ- Butyrolactone and the like can be used alone or in admixture of two or more. As the lithium salt, LiPF ₆ , LiBF ₄ , LiN (CF ₃ SO ₂ ) _2, or the like can be used.

<< Method for Manufacturing Nonaqueous Electrolyte Secondary Battery >>
Hereinafter, an example of the manufacturing method of the nonaqueous electrolyte secondary battery 1 will be described.

  First, the electrode body 15 is prepared. Although the manufacturing method of the electrode body 15 is not specifically limited, If illustrated, it will be as follows.

  A positive electrode active material, a conductive additive, and a binder are sufficiently mixed in pure water or an organic solvent to prepare a dispersion. The dispersion is applied to one or both sides of the positive electrode current collector using a die coater, slit coater, dip coater or the like. After coating, the slurry is dried, and the thickness and density are adjusted by calendering. Thereby, a positive electrode is obtained. The positive electrode lead tab 151 is attached to the positive electrode by welding or a conductive adhesive.

  The negative electrode active material and the binder are sufficiently mixed in pure water or an organic solvent to prepare a dispersion. The dispersion is applied to one side or both sides of the negative electrode current collector using a die coater, slit coater, dip coater or the like. After coating, the slurry is dried, and the thickness and density are adjusted by calendering. Thereby, a negative electrode is obtained. The negative electrode lead tab 152 is attached to the negative electrode by welding or a conductive adhesive.

  The positive electrode, the negative electrode, and the separator are wound using a winding core having a circular, elliptical, or rhomboid cross-sectional shape, and then the winding core is pulled out to make a flat shape by applying pressure in one direction. Alternatively, the positive electrode, the negative electrode, and the separator may be wound using a winding core having a flat cross-sectional shape to form a flat wound body. Thereby, the electrode body 15 is obtained.

  Next, the first member 11, the second member 12, the negative electrode terminal 14, the gasket 141, the insulating plate 142, and the pressing plate 143 are prepared. The negative electrode terminal 14, the gasket 141, the insulating plate 142, and the pressing plate 143 are assembled to the first member 11.

  The electrode body 15 is disposed inside the peripheral wall portion 112 of the first member 11. The positive electrode lead tab 151 and the first member 11 are welded, and the negative electrode lead tab 152 and the pressing plate 143 are welded. The second member 12 is disposed so as to cover the opening of the first member 11, and the first member 11 and the second member 12 are seam welded.

  Next, an electrolytic solution is injected from the through hole 1112a. That is, the through hole 1112a serves as a pouring hole for the electrolyte while positioning the positive electrode terminal 13 by fitting with the boss 131B. The positive electrode terminal 13 also serves as a sealing plug for the liquid injection hole.

  While the through hole 1112a is open, preliminary charging is performed as necessary. Thereafter, the boss portion 131B of the positive electrode terminal 13 is press-fitted into the through hole 1112a, and the flat portion 131A and the first member 11 are welded. Thus, the positive terminal 13 is fixed to the outer can 10 and the through hole 1112a is sealed.

  Then, the nonaqueous electrolyte secondary battery 1 is manufactured by charging to a predetermined capacity.

<< Effects of Embodiment >>
As described above, in the nonaqueous electrolyte secondary battery 1 according to the present embodiment, the outer surfaces of the first side wall 111 and the second side wall 121 of the outer can 10 include a bent shape. More specifically, the outer surfaces of the first side wall part 111 and the second side wall part 121 are formed so as to form an arc shape protruding in one direction in the thickness direction in plan view. For this reason, the nonaqueous electrolyte secondary battery 1 can be applied to a device having a curved surface in a space for arranging the battery, such as a wearable device. That is, according to the present embodiment, diversification of battery applications can be achieved.

  Further, in the outer can 10 of the nonaqueous electrolyte secondary battery 1, the third side wall portion 113 is disposed on the inner side of the first side wall portion 111. It is smaller than the thickness. Thereby, it can control that the electrode body 15 accommodated in 10 A of electrode body accommodation area | regions moves, and can hold | maintain the position of the electrode body 15 stably. As a result, in the nonaqueous electrolyte secondary battery 1, components such as a spacer for fixing the electrode body 15 can be omitted. However, this embodiment does not exclude placing a spacer or the like inside the outer can 10. That is, the nonaqueous electrolyte secondary battery 1 may include a component such as a spacer for fixing the electrode body 15.

  In the present embodiment, the outer can 10 includes a concave first member 11 whose one surface in the thickness direction is open, and a second member 12 that seals the opening of the first member 11. According to this configuration, it is easy to manufacture a large battery having a large dimension in the width direction and the height direction, or a thin battery having a small thickness with respect to the dimension in the width direction and the height direction. That is, when opening the surface in the thickness direction of the first member 11, deep drawing is not necessary as compared to opening the surface in the height direction and the width direction of the first member 11. Processing becomes easy. Therefore, a large-area or thin battery can be manufactured more easily than before.

  In the present embodiment, the peripheral edge of the opening of the first member 11 is located on the same plane perpendicular to the thickness direction over the entire circumference. For this reason, the 1st member 11 and the 2nd member 12 which seals opening of the 1st member 11 can be joined easily.

  In the present embodiment, the negative electrode terminal 14 is provided on the outer surface of the third side wall 113 that is disposed on the inner side of the first side wall 111. In other words, the negative electrode terminal 14 is provided in the electrode body regulating region 10 </ b> B on the outer surface of the outer can 10. According to this configuration, it is possible to prevent the thickness of the nonaqueous electrolyte secondary battery 1 from increasing. In addition, since a space for providing the negative electrode terminal 14 is secured on the wide surface (the surface extending in the height direction and the width direction) of the outer can 10, the dimension in the thickness direction of the nonaqueous electrolyte secondary battery 1 is small. Even if it exists, the negative electrode terminal 14 can be provided.

  In the present embodiment, the positive electrode terminal 13 is also provided in the electrode body regulating region 10 </ b> B on the outer surface of the outer can 10. Therefore, an increase in the thickness of the nonaqueous electrolyte secondary battery 1 can be prevented more reliably. Moreover, even if the dimension of the non-aqueous electrolyte secondary battery 1 in the thickness direction is small, the positive electrode terminal 13 can be provided.

  In the present embodiment, in the outer can 10, the third side wall 113 is connected to the first side wall 111 through the step 114 and is disposed closer to the second side wall 121 than the first side wall 111. According to this configuration, the nonaqueous electrolyte secondary battery 1 can be made more compact.

  In the present embodiment, the outer surface of the third side wall portion 113 is formed in a flat shape. For this reason, the positive electrode terminal 13 and the negative electrode terminal 14 can be easily installed on the outer surface of the third side wall portion 113.

  In this embodiment, the 1st side wall part 111 and the 2nd side wall part 121 are formed so that the cross section of the xy direction may make the circular arc shape which protrudes in the same direction. According to this configuration, the nonaqueous electrolyte secondary battery 1 can be further compacted.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.

  The nonaqueous electrolyte secondary battery 2 (FIG. 7) according to the second embodiment is different from the nonaqueous electrolyte secondary battery 1 according to the first embodiment in the configuration of the outer can 20. Hereinafter, the exterior can 20 will be mainly described, and detailed description of other configurations will be omitted.

  As shown in FIG. 8, the outer can 20 of the nonaqueous electrolyte secondary battery 2 is similar to the first embodiment in the electrode body housing region 20 </ b> A for housing the electrode body 15 and the dimension in the thickness direction of the electrode body 15. And an electrode body regulating region 20B having a portion smaller than the thickness.

  As shown in FIGS. 7 and 8, the outer can 20 includes a first member 21 and a second member 22. The first member 21 has a first side wall part 211, a third side wall part 213, and a peripheral wall part 212. The second member 22 has a second side wall part 221, an upper wall part 222, and a bottom wall part 223. Since the structure of the 1st side wall part 211 and the surrounding wall part 212 of the 1st member 21, and the 2nd member 22 is the same as that of 1st Embodiment, description about these is abbreviate | omitted.

  The third side wall part 213 is connected to the first side wall part 211 via the step 214. The third side wall portion 213 is included in the electrode body regulating region 20B. The third side wall portion 213 is configured in the same manner as the third side wall portion 113 of the first embodiment except that its outer surface is curved. The third side wall portion 213 is formed so as to form an arc shape whose outer surface protrudes toward the second member 22 when viewed from above the nonaqueous electrolyte secondary battery 2. That is, although not particularly illustrated, the cross section in the xy direction of the third side wall portion 213 has an arc shape protruding toward the second member 22 side. Therefore, the outer surface of the third side wall portion 213 is entirely curved. In addition, the cross section of the 1st side wall part 211 and the 2nd side wall part 221 of the xy direction makes the circular arc shape which protrudes in the same direction as the cross section of the 3rd side wall part 213 of the xy direction.

  Thus, in this embodiment, since the curved part was formed also in the outer surface of the 3rd side wall part 213 in the armored can 20, the further diversification of the use of a battery can be achieved.

  In addition, the curved shape of the 3rd side wall part 213 in this embodiment is not specifically limited. For example, as shown in FIG. 9, the third side wall portion 213A of the first member 21A may be formed to have an arc shape that protrudes on the opposite side to the second member 22A when viewed from above the outer can 20A. Good. The first side wall portion 211A of the first member 21A and / or the second side wall portion 221A of the second member 22A may be curved in the same direction as the third side wall portion 213A, but in the opposite direction to the third side wall portion 213A. It can also be curved. Also in the outer can 20 shown in FIGS. 7 and 8, the first side wall portion 211 and / or the second side wall portion 221 and the third side wall portion 213 may be curved in the same direction or curved in different directions. You may do it.

[Modification]
As mentioned above, although each embodiment of this invention was described, this invention is not limited to said each embodiment, A various change is possible unless it deviates from the meaning.

  For example, in each of the above-described embodiments, the case where the electrode body 15 accommodated in the outer cans 10 and 20 is an electrode winding body obtained by winding a belt-like positive electrode and a negative electrode with a separator interposed therebetween. . However, the electrode body accommodated in the outer can is not limited to the electrode winding body, and may be, for example, an electrode laminate in which strip-shaped positive electrodes and negative electrodes are stacked with a separator interposed therebetween.

  In the above embodiments, the case where the polarity of the outer cans 10 and 20 is the positive electrode has been described, but the polarity of the outer cans may be the negative electrode. Alternatively, the outer can may be insulated from both the positive electrode and the negative electrode. When the outer can is electrically connected to one of the positive electrode and the negative electrode, the external terminal having the same polarity as the polarity of the outer can may not be formed.

  In each said embodiment, although the positive electrode terminal 13 and the negative electrode terminal 14 were arrange | positioned on the outer surface of the 3rd side wall parts 113 and 213, it is not specifically limited to this. In the outer can, only one of the positive electrode terminal and the negative electrode terminal can be provided on the outer surface of the third side wall part, or both the positive electrode terminal and the negative electrode terminal may be provided at a place other than the outer surface of the third side wall part. . In addition, even when the outer can is in conduction with the positive electrode or negative electrode of the electrode body and a terminal having the same polarity as the polarity of the outer can is not provided, a terminal having a polarity opposite to the polarity of the outer can is provided on the outer surface of the outer can. The place to arrange is not particularly limited.

  In each said embodiment, although the 3rd side wall parts 113 and 213 of the 1st members 11 and 12 were arrange | positioned near the 1st side wall parts 111 and 211 rather than the peripheral part of the opening of the 1st members 11 and 21, The third side wall portion may be disposed closer to the second side wall portion than the peripheral edge portion of the opening of the first member. That is, when the first member is viewed from the width direction, the third side wall portion of the first member may protrude from the opening of the first member.

  In the said 1st Embodiment, although the outer surface of the 3rd side wall parts 113 and 213 was formed in planar shape perpendicular | vertical to the thickness direction, a 3rd side wall part can be formed in various shapes.

  For example, as shown in FIG. 10, in the outer can 30, an inclined portion 315 that is connected to the first side wall portion 311 and is inclined toward the second member 31 can be provided as the third side wall portion. Also in this case, in the outer can 30, there is a portion where the dimension (inner dimension) in the thickness direction is smaller than the thickness of the electrode body 15 in the portion where the inclined portion 315 and the second side wall portion 321 of the second member 32 face each other. It is formed. That is, the outer can 30 includes an electrode body housing region 30 </ b> A that houses the electrode body 15, and an electrode body regulating region 30 </ b> B having a portion whose dimension along the thickness direction is smaller than the thickness of the electrode body 15. The inclined portion 315 may be connected to the first side wall portion 311 through a step or may be directly connected to the first side wall portion 311.

  In the non-aqueous electrolyte secondary battery shown in FIG. 10, the positive electrode terminal 13 and the negative electrode terminal 14 are preferably disposed on the inclined portion 315, but at least one of the positive electrode terminal 13 and the negative electrode terminal 14 is other than the inclined portion 315. You may arrange at the place. Further, as described above, when the outer can 30 is electrically connected to one of the positive electrode and the negative electrode of the electrode body, a terminal having the same polarity as the polarity of the outer can 30 may not be provided.

  As a method of forming the electrode body regulating region in the outer can, various methods other than the method of providing the third side wall portion on the first member of the outer can can be considered. For example, a side wall similar to the third side wall of the first member may be provided on the second member. In this case, the first member may have the third side wall portion, or the first side member may not exist in the first member. In addition, by forming the first side wall portion and the second side wall portion in substantially the same size and forming one or more recesses in at least one of the first side wall portion and the second side wall portion, the outer can It is also possible to form an electrode body regulating region having a portion whose dimension along the length direction is smaller than the thickness of the electrode body.

  In each of the embodiments described above, in the outer cans 10 and 20, the peripheral edge of the opening of the first member 11 and 21 is located on one plane extending in the direction perpendicular to the thickness direction over the entire circumference. However, it is not particularly limited to this. For example, the first member may be configured such that the entire peripheral edge of the opening is positioned on one plane inclined with respect to the thickness direction, and the peripheral edge of the opening includes unevenness in the thickness direction. And may not be located on the same plane. In addition, the peripheral part of the 2nd member which seals opening of a 1st member is formed in the shape corresponding to the peripheral part of opening of a 1st member.

  In each of the above-described embodiments, the outer cans 10 and 20 have the first members 11 and 21 whose surfaces in the thickness direction are open and the second members 21 and 22 that seal the openings of the first members 11 and 21. However, it is not particularly limited to this. That is, the outer can does not need to have the first members 11 and 12 and the second members 12 and 22 as in the above embodiments. For example, the outer can can be configured to insert the electrode body from the bottom thereof.

  The bending shapes on the outer surfaces of the first and second side wall portions are not limited to those shown in the above embodiments. For example, the first and second side wall portions can be protruded on the opposite side to the first and second side wall portions 111 and 121 of the first embodiment. That is, as shown in FIGS. 11A and 11B, the outer surface of the first side wall portion 411 is formed in an arc shape that protrudes on the opposite side to the second side wall portion 421 when viewed from above the outer can 40. The outer surface of the portion 421 can be formed in an arc shape protruding toward the first side wall portion 411 side.

  In the example shown in FIGS. 12A and 12B, the outer surface of the first side wall portion 511 is formed in a substantially planar shape when viewed from above the outer can 50, and the outer surface of the second side wall portion 521 is the first side wall portion 511 side. It is formed in a circular arc shape that protrudes from the top. That is, the outer can 50 has a curved shape on the outer surface of the second side wall portion 521, and does not have a curved shape on the outer surface of the first side wall portion 511. Although not particularly illustrated, the curved shape may be formed on the outer surface of the first side wall portion without forming the curved shape on the outer surface of the second side wall portion.

  13A and 13B also, in the outer can 60, the outer surface of the second side wall portion 621 includes a curved shape, while the outer surface of the first side wall portion 611 does not include a curved shape. However, in FIG. 13A and FIG. 13B, the outer surface of the second side wall portion 621 is formed in an arc shape that protrudes on the opposite side to the first side wall portion 611 when viewed from above the outer can 60.

  Moreover, you may form a bending shape by bend | folding the outer surface of at least one of a 1st and 2nd side wall part. For example, as shown in FIGS. 14A and 14B, in the outer can 70, the outer surface of the first side wall portion 711 is formed from a flat portion 711 </ b> A that is parallel to the width direction and the height direction, and both width direction end portions of the flat portion 711 </ b> A. And slope portions 711B and 711C extending to the outer side and the second side wall portion 721 side. The flat surface portion 711A and the slope portions 711B and 711C are connected via the bent portions 711D and 711E, respectively. In the example of FIGS. 14A and 14B, the outer surface of the second side wall portion 721 includes a plane portion 721A parallel to the width direction and the height direction, and the first side wall portion outside the both ends in the width direction of the plane portion 721A. 711 and slope portions 721B and 721C extending on the opposite side. The flat surface portion 721A and the slope portions 721B and 721C are connected to each other through bent portions 721D and 721E, respectively.

  In each of the above-described embodiments and modification examples, the entire outer surfaces of the first and second side wall portions are bent. However, the shape of the outer surface of the first and second side wall portions is not limited thereto. Absent. In at least one of the first side wall part and the second side wall part, it is only necessary that at least a part of the outer surface of the part included in the electrode body accommodation region has some bent shape. In the outer can, the outer surface of the portion included in the electrode body regulating region may include a bent shape or may not include the bent shape.

1, 2: Non-aqueous electrolyte secondary battery 10, 20, 20A, 30, 40, 50, 60, 70: Exterior can, 10A, 20A, 30A: Electrode body accommodation area, 10B, 20B, 30B: Electrode body regulation Area, 11, 21, 21A: first member, 111, 211, 211A, 311, 411, 511, 611, 711: first side wall, 113, 213, 213A, 315: third side wall, 114, 214: Step, 12, 22, 22A: second member, 121, 221, 221A, 321, 421, 521, 621, 721: second side wall, 13, 14: terminal, 15: electrode body

Claims (9)

An electrode body including a positive electrode and a negative electrode;
An electrode body housing region for housing the electrode body, and an electrode body regulating region having a portion in the thickness direction of the electrode body housed in the electrode body housing region that is smaller than the thickness of the electrode body. An outer can,
With
The outer can is
The first and second side wall portions disposed so as to face each other in the thickness direction of the electrode body accommodated in the electrode body accommodation region, at least a part of which is included in the electrode body accommodation region;
Have
At least one of the first and second side wall portions is a nonaqueous electrolyte secondary battery including a bent shape on an outer surface of a portion included in the electrode body housing region. The nonaqueous electrolyte secondary battery according to claim 1,
The outer can is
A concave first member that includes the first side wall and has an opening on the opposite side of the first side wall;
A second member including the second side wall and sealing the opening of the first member;
A non-aqueous electrolyte secondary battery. The nonaqueous electrolyte secondary battery according to claim 2,
The first member is a non-aqueous electrolyte secondary battery formed such that a peripheral edge portion of the opening is located on the same plane over the entire circumference. The nonaqueous electrolyte secondary battery according to any one of claims 1 to 3, further comprising:
On the outer surface of the outer can, provided in the electrode body regulating region, a terminal electrically connected to the positive electrode or the negative electrode,
A non-aqueous electrolyte secondary battery. The nonaqueous electrolyte secondary battery according to any one of claims 1 to 4,
The outer can is further
A third side wall connected to the first side wall through a step and disposed closer to the second side wall than the first side wall in the electrode body regulating region;
A non-aqueous electrolyte secondary battery. The nonaqueous electrolyte secondary battery according to claim 5,
The non-aqueous electrolyte secondary battery, wherein an outer surface of the third side wall is formed in a planar shape. The nonaqueous electrolyte secondary battery according to claim 5,
The third side wall portion is a non-aqueous electrolyte secondary battery in which at least a part of an outer surface thereof is curved. The nonaqueous electrolyte secondary battery according to any one of claims 1 to 7,
A nonaqueous electrolyte secondary battery in which at least one of the first and second side wall portions is formed such that a cross section along the thickness direction of the electrode body accommodated in the electrode body accommodation region forms an arc shape. . The nonaqueous electrolyte secondary battery according to claim 8,
The first and second side wall portions are formed such that a cross section along the thickness direction of the electrode body housed in the electrode body housing region forms an arc shape projecting in the same direction. Next battery.

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