JPWO2013018640A1 - battery - Google Patents

Abstract

For example, when assembling a cell by combining a plurality of batteries (unit batteries), the battery includes a support member that functions as a fixed portion or a grip portion, and the support member may cause a decrease in battery characteristics. There is provided a highly reliable battery that is securely held in the exterior body with high positional accuracy in such a manner that there is no such thing. The support member 20 is held in the joint portion 18 where the adhesive layers of the laminate sheets constituting the exterior body 14 are thermally welded in the region B separated from the region A in which the battery element 11 is accommodated. At least a part (for example, both end portions 20a and 20b) is projected from the exterior body to the outside. A part of the support member penetrates the joint, and the tip of the part through which the support member penetrates projects from the exterior body to the outside. When the planar shape of the exterior body is a square, the tip of the support member is configured to protrude outward from different sides of the exterior body.

Description

  According to the present invention, a battery element including a laminate in which a positive electrode member and a negative electrode member are laminated so as to face each other with a separator interposed therebetween and an electrolyte solution are housed in an exterior body, and the positive electrode lead terminal and the negative electrode lead terminal are More specifically, the present invention relates to a battery including a support member for fixing the battery to another member.

  In recent years, secondary batteries typified by lithium ion secondary batteries have been widely used as power sources for portable electronic devices such as mobile phones and portable personal computers.

  By the way, as such a secondary battery (hereinafter, also simply referred to as “battery”), a laminated body in which a plurality of positive electrode members and negative electrode members are laminated via a separator and an electrolyte solution are contained in an exterior body (housing). A structure in which a positive electrode lead terminal and a negative electrode lead terminal that are housed in a container and are electrically connected to a positive electrode member and a negative electrode member are drawn out of the exterior body is widely used.

  As one of such batteries, a battery provided with a support member for fixing the battery to another member is known. In addition, when fixing the battery to other members, a support member is necessary in addition to the positive electrode lead terminal and the negative electrode lead terminal. When an external stress such as the above is applied, the joint between the positive electrode lead terminal and the negative electrode lead terminal and the current collector (current collector foil) that connects the positive electrode member and the negative electrode member constituting the battery element is likely to be damaged. Because.

  As shown in FIG. 10, as a battery including such a support member, a positive electrode lead terminal 56a and a negative electrode lead terminal 56b are made of an exterior body (a laminate sheet in which a metal layer such as aluminum and a thermoplastic resin layer are laminated). A pair of sides 55a and 55b perpendicular to the sides from which the positive electrode lead terminal 56a and the negative electrode lead terminal 56b are drawn out of the outer package 55 are cylindrical support members 57a. , 57b has been proposed (see Patent Document 1).

  In the battery 50, since the pair of sides 55a and 55b of the outer package 55 are wound around and fixed to the support members 57a and 57b, the battery 50 has high vibration resistance and impact resistance, and has a battery. The size in the width direction of 50 can be reduced.

As another example of a conventional battery, a battery (unit battery) 60 as shown in FIG. 11 has been proposed (see Patent Document 2).
The battery 60 includes a battery 64 and a fixed part formed with a pair of laminate sheets 64 on both upper and lower sides, and fixed parts 65a and 66a used for fixing the battery 60 to other members. A pair of laminates in a state in which a part of the fixing location forming members 65 and 66 is disposed between the upper and lower laminate sheets at least partially around the upper and lower laminate sheets. And a joining portion 64a in which the peripheral edge of the sheet is heat-welded. In addition, the positive electrode lead terminal 67 and the negative electrode lead terminal 68 are drawn out from the side where the fixing part forming members 65 and 66 of the outer package 64 are not held.

  In Patent Document 2, as shown in FIG. 12, the fixing portion forming member 66 is pulled out from the inside of the housing space 69 of the exterior body 64 in which the battery element 61 is housed through the joint portion 64 a. Structures have also been proposed.

  In the battery (unit battery) of Patent Document 2 having such a configuration, it is possible to easily fix and position the battery, and to improve workability.

  However, in the case of the battery described in Patent Document 1, a laminate sheet in which a thermoplastic resin layer is laminated on both main surface sides of a metal layer such as aluminum is used as a laminate sheet constituting an exterior body (Patent Document). 1, paragraph 0039), in the case of such a laminate sheet, the resin layer on the outer side of the outer package 55 pays attention to the function as a protective layer such as a metal layer, and in many cases, adhesion is not particularly taken into consideration. The portions wound around the members 57a and 57b may be detached from the support members 57a and 57b, and the module structure may be destroyed.

  Further, in the case of the battery of Patent Document 2, a part of the fixing point forming members 65 and 66 enters the housing space 69 of the battery element 61, and the battery element, particularly the electrolyte and the fixing point forming member 65, Since 66 is in contact, there is a possibility that the electrolytic solution reacts with the fixing portion forming members 65 and 66 to cause deterioration of the electrolytic solution. Moreover, since the fixing | fixed location formation members 65 and 66 are hold | maintained by the junction part 64a, when the sealing of the exterior body 64 worsens, water may infiltrate in a battery and may cause a fall of a battery characteristic. There is a problem.

JP 2010-218756 A JP 2010-67422 A

  The present invention solves the above-mentioned problems, for example, a battery including a support member that functions as a fixing part or a gripping part when a cell is assembled by combining a plurality of batteries (unit batteries). It is an object of the present invention to provide a highly reliable battery in which the support member is securely held in the exterior body with high positional accuracy in such a manner that the battery characteristics do not deteriorate.

In order to solve the above problems, the battery of the present invention (Claim 1)
A battery element including a laminate in which a positive electrode member and a negative electrode member are opposed to each other with a separator interposed therebetween, and a battery element including an electrolyte, an outer protective layer made of resin, an intermediate gas barrier layer made of metal, and a resin Laminate sheet that is laminated and integrated with an inner adhesive layer made of, is accommodated inside the exterior body that is formed by arranging the adhesive layers so that the adhesive layers face each other and joining the peripheral edges, And the positive electrode lead terminal electrically connected to the positive electrode member and the negative electrode lead terminal electrically connected to the negative electrode member are batteries having a structure drawn out of the exterior body,
While having a support member for fixing the battery to another member,
The support member is held in a joint portion where the adhesive layers are joined in a state of being sandwiched between the pair of laminate sheets in a region separated from the region in which the battery element is accommodated. And,
The support member is characterized in that at least a part protrudes from the exterior body to the outside.

  In the battery of the present invention, as in claim 2, it is preferable that a part of the support member penetrates the joint portion, and a tip of the support member protrudes from the exterior body to the outside. .

  According to a third aspect of the present invention, it is preferable that the support member has a shape including a bent portion, and the bent portion is located at the joint portion.

  According to a fourth aspect of the present invention, it is preferable that a planar shape of the exterior body is a square, and the tip of the support member protrudes from different sides of the exterior body.

  Further, as in claim 5, it is preferable that the both end portions of the support member protrude outward from a side different from a side from which the positive electrode lead terminal and the negative electrode lead terminal are drawn.

  Further, it is preferable that a plurality of the support members are provided as in the sixth aspect.

In the battery of the present invention (Claim 1), the adhesive layers are bonded together in a state where the support member is sandwiched between a pair of laminate sheets in a region separated from the region in which the battery element is accommodated. Since it is made to hold | maintain at a junction part, a support member does not contact | connect a battery element and it becomes possible to acquire the battery characteristic similar to the battery which does not provide a support member reliably.
That is, since the support member is held at the joint portion between the adhesive layers in a region separated from the region in which the battery element is accommodated, there is a possibility that the electrolyte deteriorates due to the support member coming into contact with the electrolyte or the like. A highly reliable battery that does not cause deterioration of the sealing performance of the exterior body by holding the supporting member and deterioration of battery characteristics due to intrusion of moisture or the like into the battery due to the support member. Can be obtained.
In addition, since the support member is held and fixed at the joint, the support member is unlikely to drop off, and a highly reliable battery can be obtained.
In the battery of the present invention, since at least a part protrudes from the exterior body to the outside, the basic effect that the battery can be reliably fixed to another member via the support member is obtained. Can do.

  In addition, when a part of the support member penetrates the joint portion and the tip of the support member protrudes from the exterior body, the support member can be further prevented from falling off, Can be improved.

  In addition, when the support member includes a bent portion and the bent portion is positioned at the joint portion, the support member can be firmly coupled to the joint portion, and the support member is not easily dropped. Thus, reliability can be improved.

  In addition, when the outer shape of the exterior body is a square, and the front end of the support member protrudes from different sides of the exterior body, a reliable support member having a high performance for supporting the battery is provided. It becomes possible to provide a battery with high performance.

  Further, when the both end portions of the support member are protruded to the outside from a side different from the side from which the positive electrode lead terminal and the negative electrode lead terminal are drawn out, the sealing performance of the exterior body is prevented from being impaired. This makes it possible to make the present invention more effective.

  Further, in the present invention, by providing a configuration including a plurality of the support members, the support reliability and the support position accuracy when the battery is supported via the support members are increased, and the dimensional accuracy of the module is also improved. To do.

It is a top view which shows the battery concerning one Example of this invention. It is principal part sectional drawing of the battery concerning the Example of this invention. It is a figure which shows the structure of the laminate sheet which comprises the exterior body of the battery concerning the Example of this invention. It is a top view which shows the modification of the battery concerning the Example of this invention. It is a top view which shows the other modification of the battery concerning the Example of this invention. It is a top view which shows the further another modification of the battery concerning the Example of this invention. It is a top view which shows the further another modification of the battery concerning the Example of this invention. It is a figure which shows the attachment structure of the supporting member of the battery of FIG. It is a top view which shows the further another modification of the battery concerning the Example of this invention. It is a perspective view which shows the conventional battery. It is a perspective view which shows the other conventional battery. It is a top view which shows the principal part of other conventional batteries.

  Examples of the present invention will be described below to describe the features of the present invention in more detail.

FIG. 1 is a plan view showing a battery (lithium ion secondary battery) (unit battery) according to one embodiment of the present invention, and FIG.
A battery (lithium ion secondary battery) (unit battery) 1 of this example includes a laminate formed by laminating a positive electrode member and a negative electrode member so as to face each other via a separator, and an electrolytic solution as an electrolyte. A battery element 11 including, a positive electrode lead terminal 12 and a negative electrode lead terminal 13 electrically connected to each of a positive electrode member and a negative electrode member (not shown) of the battery element 11, and a plane containing the battery element 11 The exterior body 14 has a substantially rectangular shape, and the positive electrode lead terminal 12 and the negative electrode lead terminal 13 are drawn out from one side of the exterior body 14 to the outside.

  As shown in FIG. 3, the outer package 14 includes an outer protective layer 15 made of resin (polyamide resin in this embodiment), an intermediate gas barrier layer 16 made of metal (aluminum in this embodiment), a resin ( In this embodiment, it is formed by using laminate sheets 14a and 14b which are laminated and integrated with an inner adhesive layer 17 made of polypropylene resin. That is, the exterior body 14 is formed by arranging a pair of laminate sheets 14a and 14b so that the adhesive layers 17 face each other, and then joining the peripheral portions of the pair of laminate sheets 14a and 14b by heat welding. ing. In this embodiment, as the laminate sheets 14a and 14b, those subjected to drawing processing are used to form the accommodation space 30 (FIG. 2) in which the battery element 11 is accommodated.

  In the present invention, the exterior body formed by joining a pair of laminate sheets is formed by joining two laminate sheets formed separately, and one laminate sheet. This includes both cases where a pair of regions formed by bending a pair is formed by facing each other and joined.

  In addition, as the adhesive layer 17 of the laminate sheets 14a and 14b, polyethylene terephthalate (PET) resin can be used instead of polypropylene resin.

  The battery 1 further includes a support member 20 for fixing the battery 1 to another member. As shown in FIGS. 1 and 2, the support member 20 has a central portion 20 c in a region B separated from the region A in which the battery element 11 is accommodated. Further, it is held and fixed while being sandwiched between the laminate sheets 14a and 14b. Further, both end portions 20a and 20b of the support member 20 protrude from the exterior body 14 to the outside, and the both end portions 20a and 20b function as support portions for fixing the battery 1 to other members.

  That is, in the battery 1 of this embodiment, a part of the support member 20 (central portion 20c) penetrates the joint portion 18, and both end portions (both end portions) of the penetrating portion (central portion 20c). 20a, 20b protrudes from the exterior body 14 to the outside.

  In this embodiment, a plate-like member made of polypropylene resin is used as the support member 20. However, the support member 20 is not limited to a plate shape, and may have various structures such as a square bar shape, a square tube shape, a round bar shape, or a cylindrical shape.

  In addition, as the constituent material of the support member 20, various kinds of characteristics (rigidity, mechanical strength, etc.) that should be provided as the support member 20, such as a resin other than polypropylene resin, a metal such as aluminum, or a composite material thereof, are provided. It is possible to use materials.

Next, a method for manufacturing the battery 1 of this embodiment will be described with reference to FIGS.
(1) First, a battery element 11 including a laminate in which a positive electrode member and a negative electrode member are laminated so as to face each other with a separator interposed therebetween, and a recess for accommodating the battery element 11 are provided. A pair of laminate sheets 14a and 14b formed by drawing is prepared.

  (2) Then, the battery element 11 and the pair of laminate sheets 14a and 14b are arranged so that the battery element 11 is positioned in the accommodating space 30 formed by the pair of laminate sheets 14a and 14b, and the laminate sheets 14a and 14b are disposed. Are joined together by thermal welding to seal the battery element 11 in the internal space of the exterior body 14. At this time, the positive electrode lead terminal 12 and the negative electrode lead terminal 13 are drawn out from the joint portion 18 on one side of the exterior body 14 to the outside.

  (3) Then, after disposing the support member 20 on the surplus portion of the joint portion 18 on the side opposite to the side from which the positive electrode lead terminal 12 and the negative electrode lead terminal 13 are drawn out, The support member 20 and the laminate sheets 14a and 14b are joined by welding. In addition, when arrange | positioning the supporting member 20 in the surplus part of the junction part 18, specifically, a peripheral part (4 in the process of said (2) outside the junction part 18 of laminate sheet 14a, 14b, for example. In the region (excess part) that has not been joined yet at the stage of joining the sides), the center part 20c of the support member 20 is sandwiched between the laminate sheets 14a and 14b, and then joined by thermal welding as described above.

  Thereby, as shown in FIGS. 1-3, in the area | region B where the center part 20c of the supporting member 20 was spaced apart from the area | region A in which the battery element 11 was accommodated, the adhesive layers 17 of the laminate sheets 14a and 14b are mutually. A battery having a structure in which both end portions 20a and 20b of the support member 20 protrude from the exterior body 14 to the outside while being held and fixed in a state sandwiched between the laminate sheets 14a and 14b. 1 is obtained.

  In this embodiment, the peripheral portions (four sides) of the laminate sheets 14 a and 14 b are joined by heat welding, and the battery element 11 is sealed in the internal space of the exterior body 14. 20, and the support member 20 and the laminate sheets 14 a and 14 b are joined by heat welding so that the center portion 20 c of the support member 20 is held by the joint portion 18. The peripheral edges of the laminate sheets 14 a and 14 b By simultaneously joining the portion (four sides) and the region where the support member 20 is disposed, it is also possible to perform the sealing of the exterior body 14 and the holding of the support member 20 by a single joining process. is there. In addition, as a joining method, methods, such as crimping | bonding, adhesion | attachment, ultrasonic welding, can be used, sealing of the exterior body 14 can be performed reliably and the support member 20 can be hold | maintained, It is not limited to the method of heat welding.

In the battery 1 of this embodiment, the support member 20 has a central portion 20c that penetrates the joint portion 18 in a region B separated from the region A in which the battery element 11 is accommodated, and the support member 20. Since the central portion 20c is held (attached) to the joint portion 18 of the laminate sheets 14a and 14b and is held by the exterior body 14, the support member 20 comes into contact with the battery element (for example, electrolyte solution) 11 Therefore, it is possible to obtain the same battery characteristics as those of the battery that does not include the support member 11. That is, since the support member 20 does not come into contact with the battery element (for example, the electrolyte solution 11), the battery characteristics of the battery due to the deterioration of the electrolyte solution or the intrusion of moisture into the interior due to the decrease in the sealing performance of the exterior body 14. A highly reliable battery 1 that does not deteriorate can be obtained.
In addition, the manufacturing method of said battery demonstrated the outline | summary, and the battery of this invention can be manufactured by applying not only the said method but a well-known various method.

  Further, since the support member 20 is held by the joint portion 18 on the side opposite to the side opposite to the side where the positive electrode lead terminal 12 and the negative electrode lead terminal 13 are drawn out of the outer body 14, It is possible to prevent the sealing performance of the body 14 from being impaired and further improve the reliability.

  Further, in the battery 1 of this embodiment, the joint portion 18 is formed by welding polypropylene resins (adhesive layer 17) that can maintain high joint strength for a long time, and the support member 20 is also made of polypropylene resin. Therefore, the support member 20 is not easily detached from the exterior body 14, and the positional accuracy is also improved. Furthermore, since the support member 20 is used as a gripping part or a fixing part when assembling the cells, it is possible to obtain a module with high dimensional accuracy by assembling the battery 1 of this embodiment.

  Note that the strength (adhesion strength) of the joints between the polypropylene resins is large, and the adhesive strength does not decrease even when left for a long period of time (for example, 60 ° C., 90% RH, 3000 hours) under high temperature and high humidity. Therefore, in the region B separated from the region A in which the battery element 11 is accommodated, the adhesive member 17 of the laminate sheets 14a and 14b holds and fixes the support member 20 to the joint portion 18 by heat welding. In the case of the battery of the example, it becomes possible to improve the reliability and dimensional accuracy.

  In the above embodiment, the support member 20 is sandwiched between the laminate sheets 14a and 14b and thermally welded to hold the central portion 20c of the support member 20 at the joint 18. However, the support member 20 is made of a sealant ( For example, the support member 20 may be held by heat welding in a state of being sandwiched between the laminate sheets 14a and 14b via a tape-like member made of polypropylene resin. In that case, the support member 20 can be more reliably held on the exterior body 14.

  In addition, when a support member made of a metal material is used, it is particularly meaningful to use a sealant because the affinity of the laminate sheet with the adhesive layer may not always be sufficient. However, even when a support member made of a metal material is used, it is possible to eliminate the need for a sealant by using a surface-treated member.

  In the above embodiment, the straight plate-like support members are arranged in parallel to one side of the exterior body. However, as shown in FIG. 4, a pair of straight support members 20 is provided. It is also possible to arrange the outer body 14 in such a manner that it obliquely penetrates from one side of the exterior body 14 to another side that is orthogonal to the side. When the structure as shown in FIG. 4 is adopted, in addition to the effects obtained in the case of the configuration of Example 1, the battery 1 is supported through the support member 20 because the two support members 20 are provided. In this case, the support reliability and the support position accuracy in the case are increased, and the dimensional accuracy of the module can be improved.

  Further, as shown in FIG. 5, an L-shaped support member 20 bent at a right angle is used, and this support member 20 is connected from one side of the exterior body 14 to another side that is orthogonal to the side. It is also possible to arrange in such a manner that the bent portion is located at the joint portion 18. In the case of the structure as shown in FIG. 5, in addition to the effects obtained in the case of the configuration of the first embodiment, two support members 20 having an L-shape and having a bent portion positioned at the joint 18. Therefore, the support member 20 is less likely to drop off, and it is possible to obtain a highly reliable battery 1, and support reliability and support position when the battery 1 is supported via the support member 20. The accuracy is improved, and the dimensional accuracy of the module can be improved.

  Moreover, in the said Example, the center part 20c of the supporting member 20 penetrates the junction part 18 in the area | region B spaced apart from the area | region A in which the battery element 11 was accommodated, and both ends 20a of the supporting member 20 , 20b shows the battery 1 having a structure protruding from the joint portion 18 of the exterior body 14, but as shown in FIG. 6, the support member 20 is a region separated from the region A in which the battery element 11 is accommodated. In B, one end 20a of the support member 20 is held by the joint 18 of the exterior body 14, and the other end 20b of the support member 20 is embedded in the joint 18 and not exposed to the outside. A configuration is also possible.

  As shown in FIG. 6, in the region B separated from the region A in which the battery element 11 is accommodated, a part of the support member 20 is held and fixed to the joint 18, but penetrates the joint 18. Even in the case of a configuration that does not include the battery as shown in FIG. 1 to FIG. It is possible to obtain the basic effect of the present invention in that no battery is obtained.

  In the above embodiment, as the laminate sheets 14a and 14b constituting the exterior body 14, an outer protective layer 15 made of polyamide resin, an intermediate gas barrier layer 16 made of aluminum, and an inner adhesive layer made of polypropylene resin. However, the laminate sheet that can be used in the present invention is not limited to this, and a protective layer that becomes an outer layer when an exterior body is formed is used. Various laminate sheets including a (resin layer), a gas barrier layer (metal layer) serving as an intermediate layer, and an adhesive layer (resin layer) serving as an outer layer can be used.

Moreover, the battery of this invention can be set as a structure as shown, for example in FIG.
In the battery 1 of FIG. 7, the pair of support members 20, 20 in which the positioning through holes 21 are formed are separated from the region A in which the battery element 11 is housed at the lower part of the left and right ends of the exterior body 14. The region B is disposed.

In addition, as shown in FIG. 8, each support member 20 is hold | maintained at the junction part 18 to which the contact bonding layer was joined in the state pinched | interposed into a pair of laminate sheets 14a and 14b.
7 and 8, the same reference numerals as those in FIGS. 2 and 4 indicate the same or corresponding parts.

Moreover, the battery of this invention can be set as a structure as shown, for example in FIG.
In the battery 1 of FIG. 9, an L-shaped support member 20 having a positioning through-hole 21 is used as a support member, and the L-shaped support member 20 is used for the exterior body 14. It arrange | positions in the aspect which follows the shape of the right angle part of the corner part of the exterior body 14 in the area | region B spaced apart from the area | region A in which the battery element was accommodated of the corner part of the lower right side.

In the case of the battery 1 of FIG. 9 as well, the support member 20 is not particularly shown, but, as in the case of the battery 1 shown in FIG. 7, the adhesive layer is sandwiched between a pair of laminate sheets. It is hold | maintained at the junction part 18 which mutually joined.
In FIG. 9, the parts denoted by the same reference numerals as those in FIG. 7 indicate the same or corresponding parts.

  In the above-described embodiment, the battery 1 in which both the positive electrode lead terminal 12 and the negative electrode lead terminal 13 are drawn to one side of the outer package 14 has been described as an example. However, the battery 1 is drawn to different sides, for example, opposite sides. It is also possible to configure as described above.

  The present invention is not limited to the above embodiment in other points as well, and relates to a specific shape of the support member and its constituent material, a specific configuration of the battery element, a specific shape of the exterior body, etc. Various applications and modifications can be made within the scope of the invention.

1 battery (unit battery)
DESCRIPTION OF SYMBOLS 11 Battery element 12 Positive electrode lead terminal 13 Negative electrode lead terminal 14 Exterior body 14a, 14b Laminate sheet 15 Outer protective layer (polyamide resin layer)
16 Gas barrier layer (aluminum layer)
17 Inner adhesive layer (polypropylene resin layer)
18 joint 20 support member 20a, 20b both ends 20c of support member central part of support member 21 through hole 30 accommodation space A area in which battery element is accommodated B area separated from area A

Claims (6)

A battery element including a laminate in which a positive electrode member and a negative electrode member are opposed to each other with a separator interposed therebetween, and a battery element including an electrolyte, an outer protective layer made of resin, an intermediate gas barrier layer made of metal, and a resin Laminate sheet that is laminated and integrated with an inner adhesive layer made of, is accommodated inside the exterior body that is formed by arranging the adhesive layers so that the adhesive layers face each other and joining the peripheral edges, And the positive electrode lead terminal electrically connected to the positive electrode member and the negative electrode lead terminal electrically connected to the negative electrode member are batteries having a structure drawn out of the exterior body,
While having a support member for fixing the battery to another member,
The support member is held in a joint portion where the adhesive layers are joined in a state of being sandwiched between the pair of laminate sheets in a region separated from the region in which the battery element is accommodated. And,
The battery is characterized in that at least a part of the support member protrudes from the exterior body.   2. The battery according to claim 1, wherein a part of the support member passes through the joining portion, and a tip of the support member protrudes from the exterior body to the outside.   The battery according to claim 1, wherein the support member has a shape including a bent portion, and the bent portion is located at the joint portion.   4. The battery according to claim 2, wherein a planar shape of the exterior body is a square, and the tips of the support members protrude outward from different sides of the exterior body.   The battery according to claim 4, wherein the both end portions of the support member protrude outward from a side different from a side from which the positive electrode lead terminal and the negative electrode lead terminal are drawn.   The battery according to claim 1, comprising a plurality of the support members.

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