JP2010061998A - Battery, and battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated battery capable of easily performing fixing or positioning and improving operability. <P>SOLUTION: A unit battery 1 includes: an exterior package 14 storing a bare battery 11 and made of a flexible film; an enclosing member 20 for surrounding at least a part of an external surface of the exterior package 14 and retaining the exterior package 14 by means of heat shrinkage by coming in contact with at least a part of the external surface of the exterior package 14; and fixing location forming members 31, 32 wherein fixing locations 33, 34 used for fixing the unit battery 1 on the other member are formed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a battery and an assembled battery such as a lithium ion secondary battery, a lithium secondary battery, and a polymer secondary battery, and more specifically, a battery and an assembled battery including an exterior body made of a flexible film that accommodates a unit cell. It relates to batteries. In this specification and claims, not only so-called batteries such as lithium ion secondary batteries, lithium secondary batteries, polymer secondary batteries, but also “electric storage devices” including electric double layer capacitors are collectively referred to. It is called “battery”.

  2. Description of the Related Art Conventionally, for example, batteries such as lithium ion secondary batteries have been increasingly demanded for downsizing, weight reduction, thickness reduction, shape freedom, and the like with the expansion of various applications.

  Therefore, in order to meet such demands, a laminate film having a multilayer structure has been conventionally used to form a flexible exterior body that accommodates a unit cell. The laminate film is composed of an inner surface layer facing the unit cell (battery element), an intermediate layer, and an outer surface layer facing the outside. The inner surface layer is made of, for example, a thermoplastic resin excellent in electrolytic solution resistance and heat sealability, such as polyethylene and polypropylene. An intermediate | middle layer consists of metal foil excellent in flexibility and intensity | strength, such as aluminum foil, for example. An outer surface layer consists of insulating resin excellent in electrical insulation, such as a polyamide-type resin, for example.

  A structure of a battery (hereinafter referred to as a laminate type battery) in which a unit cell is housed in an exterior body made of such a laminate film is disclosed in, for example, Japanese Patent Application Laid-Open No. 2007-173223 (hereinafter referred to as Patent Document 1). ing.

  FIG. 18 is a perspective view showing a laminate type battery disclosed in Patent Document 1. As shown in FIG.

  As shown in FIG. 18A, in the unit battery 100 as an example of the lithium ion secondary battery, the unit cell is a synthetic resin film or a laminated film of a synthetic resin film and an aluminum foil, for example, polypropylene / aluminum. / Covered with a flexible exterior material 102 made of polyamide resin. One surface of the flexible exterior material 102 is formed by embossing or the like to form a unit cell housing portion 103, and the other surface on the opposite side forms a planar member 104 to cover the unit cell. . The positive electrode terminal 105 and the negative electrode terminal 106 are drawn out from a portion where the peripheral portions of the storage portion 103 and the planar member 104 are heat-sealed and sealed. Laminating surfaces 107 and 108 that are relatively wide are formed on the outer surfaces of the storage unit 103 and the planar member 104 so as to be stacked on other adjacent unit cells 100.

  As shown in FIG. 18B, in a unit battery of another example, both surfaces of a flexible exterior material 102 are formed by embossing or the like to constitute a unit cell storage portion 103. The positive electrode terminal 105 and the negative electrode terminal 106 are drawn out from a portion where the outer peripheral edge portion of the storage portion 103 is thermally welded and sealed.

  In the unit battery 100 shown in FIG. 18, the positive electrode terminal 105 and the negative electrode terminal 106 are drawn out from the same side where the flexible packaging material 102 is sealed, but may be drawn out from the opposite sides. .

  FIG. 19 is a perspective view showing one example of the battery stack disclosed in Patent Document 1. As shown in FIG.

  As shown in FIG. 19, the battery stack 1000 is configured by stacking eight unit cells 100 shown in FIG. Specifically, the battery stack 1000 includes four unit batteries 100-1, 100-2, 100-3, 100 so that the stacked surfaces 107 and 108 (FIG. 18A) are substantially parallel to each other. -4 are stacked and the temperature fuse mounting body 2000 is arranged, and thereafter, four unit cells 100-5, 100-6, 100-7, and 100-8 are similarly stacked. The positive and negative terminals of the eight unit batteries 100-1 to 100-8 are connected in series, and the negative terminal 111 at the end is a common terminal 112 common to both charging and discharging, and the positive terminal at the end. A temperature fuse connection lead wire 115 is connected to a discharge terminal 114 connected to the discharge circuit 113. The temperature fuse connecting lead 115 is coupled to a temperature fuse provided inside the temperature fuse mounting body 2000. A charging circuit connecting lead wire 116 is taken out of the temperature fuse and connected to a charging terminal 117 for supplying a charging current during charging.

Although not shown in FIG. 19, in the battery stack 1000 as an example of a conventional assembled battery, the eight unit cells 100-1 to 100-8 are stacked between adjacent stacked surfaces 107 and 108. The positions of the eight unit cells 100-1 to 100-8 are fixed by arranging chemical fixing means such as an adhesive and a double-sided adhesive tape.
JP 2007-173223 A

  However, the following problems may occur in the conventional laminated battery.

  First, when a battery stack is configured as an example of an assembled battery by combining unit batteries as disclosed in Patent Document 1, in order to fix a plurality of laminate-type batteries to each other, or a plurality of laminate-type batteries In order to fix the battery in a predetermined housing, it is necessary to arrange a chemical fixing means such as an adhesive or a double-sided adhesive tape on the surface of the exterior body. This is because the outer body is made of a flexible film, and the outer peripheral surface and the thermally welded peripheral portion are relatively low in mechanical strength, so that the outer peripheral surface and the peripheral portion are not in contact with other components. This is because it is necessary to arrange a plurality of laminated batteries. Also, since the mechanical strength of the outer peripheral surface and peripheral edge of the outer package is relatively low, physical fixing means such as screws, bolts, rivets, etc. are directly provided on the outer package to position and fix multiple laminated batteries to each other. Can not do it.

  Next, when positioning and fixing a conventional laminate type battery alone to other components, the mechanical strength of the outer peripheral surface and the peripheral portion of the outer casing is relatively low, so that physical properties such as screws, bolts, rivets, etc. Therefore, it is impossible to position the laminated battery with respect to other components by directly providing a fixing means on the exterior body. Moreover, since the mechanical strength of the outer peripheral surface and the peripheral portion of the outer package is relatively low, it is easily damaged when stress occurs in the outer package, and it is difficult to handle the laminated battery as it is, A conventional laminate type battery has a problem that workability is poor.

  Accordingly, an object of the present invention is to provide a laminate type battery that can be fixed or positioned easily and can improve workability.

  A battery according to one aspect of the present invention surrounds at least a part of an outer surface of a flexible film that accommodates a unit cell and the outer surface of the outer package, and changes the shape of the outer surface of the outer package. And an enclosing member configured to contact at least a portion and hold the exterior body.

  In the battery according to one aspect of the present invention, the surrounding member is configured to come into contact with at least a part of the outer surface of the exterior body by shape change and hold the exterior body, so that a screw, a bolt, a rivet, etc. By fixing the fixing part forming member for attaching the physical fixing member to the surrounding member, or forming the fixing part forming part on the surrounding member, the fixing part can be given to the surrounding member. Thereby, it is possible to easily fix or position a single or a plurality of laminate-type batteries without using a chemical fixing means such as an adhesive or a pressure-sensitive adhesive tape, thereby improving workability.

  A battery according to another aspect of the present invention includes a plurality of exterior bodies each made of a flexible film that accommodates unit cells, and surrounds at least a part of the outer surfaces of the plurality of exterior bodies, and changes in shape. A surrounding member configured to contact at least a part of the outer surface of the plurality of exterior bodies and hold the plurality of exterior bodies.

  In the battery according to another aspect of the present invention, the surrounding member is configured to contact at least a part of the outer surface of the plurality of exterior bodies by the shape change and hold the plurality of exterior bodies. The member can surround and hold a plurality of laminated batteries. Thereby, a some laminated type battery can be handled as a single form. In addition, a fixing portion forming member for attaching a physical fixing member such as a screw, a bolt, or a rivet is fixed to the surrounding member, or a fixing portion forming portion is formed on the surrounding member, thereby fixing the fixing portion to the surrounding member. Therefore, it is possible to easily fix or position a plurality of laminated batteries without using a chemical fixing means such as an adhesive or a pressure-sensitive adhesive tape, thereby improving workability.

  In the battery according to one aspect or another aspect of the present invention, it is preferable that the surrounding member is configured to be in contact with at least a part of the outer surface of the exterior body by heat shrinkage and hold the exterior body. .

  By configuring in this way, it is possible to easily surround and hold the exterior body using the heat shrinkage action. Moreover, the holding | maintenance performance of an enclosure member can be improved by improving the adhesiveness of an enclosure member and the outer surface of an exterior body.

  In the battery according to one aspect or another aspect of the present invention, it is preferable that the surrounding member is formed with a through hole that reaches the outer surface of the exterior body from the outside of the surrounding member.

  With this configuration, heat generated in the unit cell can be released from the outer surface of the exterior body to the outside of the enclosing member through the through hole, so that the heat dissipation of the battery can be improved.

  Furthermore, the battery according to one aspect or another aspect of the present invention further includes 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 unit cell and extend from the outer package. The surrounding member is preferably provided with a notch in a portion close to at least one of the positive electrode connecting terminal and the negative electrode connecting terminal.

  With this configuration, heat generated in the unit cell can be released to the outside from the outer surface of the exterior body exposed by the notch, so that the heat dissipation of the battery can be improved.

  Furthermore, a battery according to one aspect or another aspect of the present invention includes 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 unit cell and extend from the exterior body. Further, the length of the surrounding member extending along the extending direction of the positive electrode connecting terminal and the negative electrode connecting terminal is preferably shorter than the length of the exterior body.

  By comprising in this way, the material of the surrounding member required in order to fix the fixing location formation member for attaching the fixing means or positioning means of a laminate type battery, or required in order to form a fixing location formation part The material of the surrounding member can be reduced.

  The battery according to one aspect or another aspect of the present invention further includes a first fixing portion forming member in which a fixing portion used for fixing the battery to another member is formed. It is preferable that the fixed location forming member is fixed to the outer surface of the surrounding member.

  As described above, since the first fixing location forming member is fixed to the surrounding member, the laminated battery can be easily fixed or positioned by attaching the fixing member to the first fixing location forming member. Moreover, since the fixed location forming member is independent of the exterior body that houses the unit cells, the shape of the fixed location forming member can be arbitrarily changed, and the degree of freedom of the structure for fixing or positioning is increased. Furthermore, since the fixed location forming member is independent from the exterior body that houses the unit cell, even if stress is generated in the fixed location forming member, the unit cell is less damaged.

  In the battery according to one aspect or another aspect of the present invention, a fixing portion used for fixing the battery to another member may be formed in the surrounding member.

  In this case, since the fixing portion is formed on the surrounding member, the laminated battery can be easily fixed or positioned by attaching the fixing member to the fixing portion. Also in this case, since the fixing location is independent of the exterior body that houses the unit cells, the shape of the fixing location can be arbitrarily changed, and the degree of freedom of the structure for fixing or positioning is increased. Furthermore, since the fixing portion is independent of the outer package that houses the unit cell, even when stress is generated at the fixing portion, the unit cell is less damaged.

  The battery according to one aspect or another aspect of the present invention further includes a second fixing portion forming member in which a fixing portion used for fixing the battery to another member is formed, and the surrounding member Encloses part of the outer surface of both the exterior body and the second fixed location forming member, and contacts part of the outer surface of both the exterior body and the second fixed location forming member due to the shape change. It is preferable to hold the outer package.

  Since a part of the outer surface of the second fixing location forming member is fixed by being surrounded by the surrounding member in this way, the fixing of the laminate type battery is performed by attaching the fixing member to the second fixing location forming member. Or positioning can be performed easily. Moreover, since the fixed location forming member is independent of the exterior body that houses the unit cells, the shape of the fixed location forming member can be arbitrarily changed, and the degree of freedom of the structure for fixing or positioning is increased. Furthermore, since the fixed location forming member is independent from the exterior body that houses the unit cell, even if stress is generated in the fixed location forming member, the unit cell is less damaged.

  The assembled battery according to the present invention includes a plurality of batteries having at least one of the above-described characteristics, and a plurality of batteries are connected by attaching a fixing member to a fixing portion.

  In the assembled battery according to the present invention, each battery can be handled as a single battery in a form surrounded and held by the surrounding member, so that a plurality of batteries can be handled separately in the assembled battery. As a result, it is possible to easily remove and replace only the defective battery or only the deteriorated battery in the assembled battery, so that an assembled battery with excellent maintainability can be obtained. In addition, since extra members such as cushioning materials are not incorporated into the assembled battery case, the space utilization efficiency can be improved, and a plurality of batteries can be accommodated in the case exactly by attaching a fixing member to the fixed location. can do. Furthermore, since mutual fixation between the individual batteries and mutual electrical connection of the electrode connecting members can be performed collectively, the number of work steps in manufacturing the assembled battery can be reduced.

  As described above, according to the present invention, it is possible to easily fix or position the laminated battery, and it is possible to improve workability.

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

(Embodiment 1)
FIG. 1 is a perspective view (A) showing a laminated battery applicable to Embodiment 1 of the battery of the present invention, and a perspective view (B) showing an enclosing member used in Embodiment 1 of the battery of the present invention. is there.

  As shown in FIG. 1A, a laminated battery 10 includes a unit cell (battery element) 11, an exterior body 14 made of a flexible film that covers and accommodates the unit cell 11, and a positive electrode of the unit cell 11. And a positive electrode connection terminal 12 and a negative electrode connection terminal 13 that are electrically connected to the negative electrode and extend from the outer casing 14. The unit cell 11 includes a positive electrode current collector, a positive electrode active material applied to the positive electrode current collector, a negative electrode current collector, a negative electrode active material applied to the negative electrode current collector, and a solid electrolyte. A flexible film is comprised from the inner surface layer which faces the unit cell 11, an intermediate | middle layer, and the outer surface layer which faces the exterior. The inner surface layer is made of, for example, a thermoplastic resin excellent in electrolytic solution resistance and heat sealability, such as polyethylene and polypropylene. An intermediate | middle layer consists of metal foil excellent in flexibility and intensity | strength, such as aluminum foil, for example. An outer surface layer consists of insulating resin excellent in electrical insulation, such as a polyamide-type resin, for example. Two flexible films are accommodated so as to sandwich the unit cell 11, and the inner surface layers are thermally welded to each other, so that a heat welded portion 141 is formed at the peripheral portion of the outer package 14. The positive electrode connection terminal 12 and the negative electrode connection terminal 13 are drawn out from the position of the heat welded portion 141 where the outer peripheral edge of the outer package 14 is heat welded and sealed. In this embodiment, the positive electrode connection terminal 12 and the negative electrode connection terminal 13 are disposed so as to protrude from opposite side portions of the exterior body 14.

  As shown in FIG. 1B, the surrounding member 20 is formed in a tubular shape as an example. Planar projecting side portions are formed on the outer surfaces of both sides of the surrounding member 20. The fixed location forming members 31 and 32 are fixed to each protruding side portion by an adhesive or heating. The fixed location forming members 31 and 32 are formed with fixed locations 33 and 34. For example, a through hole for inserting a rod-shaped member as a positioning member, a rivet as a fixed member, or a screw or bolt as a fixed member The screw hole for inserting etc. is formed. In this way, the fixing point forming members 31 and 32 are integrated with the surrounding member 20 in advance. The fixed location forming members 31 and 32 in which the fixed locations 33 and 34 are formed are functional members used for positioning and fixing the laminated battery 10.

  The surrounding member 20 only needs to have a perimeter that can surround at least a part of the outer surface of the exterior body 14 shown in FIG. 1 (A). It should just be formed from the material which can contact at least one part. For example, it is preferable that the surrounding member 20 is formed of a material having heat shrinkability so as to come into contact with at least a part of the exterior body 14 by heat shrinking in the circumferential direction. For example, examples of the material having such heat shrinkability include polyethylene terephthalate (PET), polyolefin, polystyrene, polyvinylidene fluoride, and vinyl chloride. Among these materials, polyethylene terephthalate has relatively high tensile strength but is inferior in chemical resistance. Polyolefin has excellent chemical resistance. Polyvinylidene fluoride is excellent in heat resistance. Considering the use environment of a laminate type battery such as a lithium ion secondary battery, it is preferable to use polyethylene terephthalate as the material of the surrounding member 20. In the case of a laminate type battery used in an environment where chemical resistance is required, it is preferable to use polyolefin as the material of the surrounding member 20. Further, in the case of a laminated battery used in a high temperature environment where heat resistance is required, it is preferable to use polyvinylidene fluoride as the material of the surrounding member 20. The material of the enclosing member 20 of the present invention is not limited to a material having heat shrinkability, and is a material that can contact at least a part of the outer surface of the exterior body 14 by at least a shape change. Any material that changes its shape by elasticity such as rubber may be used.

  The material of the fixing location forming members 31 and 32 may be any of synthetic resin, metal, and ceramic material. However, when a material having heat shrinkability is used as the material of the surrounding member 20, it is easily fixed to the surrounding member 20. Considering the properties, it is preferable to use a synthetic resin.

  FIG. 2 is a perspective view showing Embodiment 1 of the battery of the present invention. In addition, in FIG. 2, illustration of the heat welding part 141 of the exterior body 14 is abbreviate | omitted.

  As shown in FIG. 2, the enclosing member 20 shown in FIG. 1 (B) is surrounded by at least a part of the outer surface of the outer package 14 of the laminate type battery 10 shown in FIG. 1 (A). Deploy. For example, when the surrounding member 20 is made of PET having a thickness of 30 to 200 μm as a heat-shrinkable material and the fixing portion forming members 31 and 32 are made of polycarbonate, as an example, in an atmosphere heated to about 120 ° C. for 10 seconds. The surrounding member 20 is contracted by being left as it is, so that at least a part of the outer surface of the exterior body 14 is brought into contact with the exterior body 14 and the surrounding member 20 is integrated. In this case, the surrounding member 20 is disposed so as to cover the central portion of the exterior body 14 and expose both end portions. In this way, the surrounding member 20 surrounds at least a part of the outer surface of the exterior body 14 and contacts the at least a part of the outer surface of the exterior body 14 by the shape change to hold the exterior body 14. As the first embodiment of the present invention, a unit battery 1 that can be handled as a single form is configured.

  3 and 4 are cross-sectional views as seen from the direction along the lines III-III and IV-IV in FIG. 2, respectively.

  As shown in FIG. 3, in one embodiment, the fixing point forming members 31 and 32 may be bonded to the planar protruding side portions on both sides of the surrounding member 20, and in another embodiment as shown in FIG. The fixed location forming members 31 and 32 may be bonded to the upper and lower side portions of the outer surface of the surrounding member 20 with the fixed location forming members 31 and 32 formed of two sheets.

  FIG. 5 is a perspective view showing another embodiment 1 of the battery of the present invention. In addition, in FIG. 5, illustration of the heat welding part 141 of the exterior body 14 is abbreviate | omitted.

  As shown in FIG. 5, the surrounding member 20 surrounds at least a part of the outer surface of the exterior body 14 of the two laminate type batteries, and contacts at least a part of the outer surface of the exterior body 14 due to the shape change. By holding the exterior body 14, the unit battery 1 that can be handled as a single form as another embodiment 1 of the present invention may be configured. Note that the number of laminated batteries surrounded by the surrounding member 20 is not limited to two, and may be three or more.

  6 is a perspective view showing Embodiment 1 of an assembled battery configured by combining a plurality of unit batteries shown in FIG.

  As shown in FIG. 6, in each of the fixing locations 33 and 34 (FIG. 5) of the fixing location forming members 31 and 32 of the unit battery, in this example, the through hole has a rod-shaped member as a positioning member or a fixing member 41 is inserted, and a spacer 42 is disposed as a spacing member between the adjacent fixed location forming members 31 and 32. Thus, for example, the assembled battery 2 that can be positioned and fixed in the housing is configured on the component member.

  FIG. 7 is a perspective view showing another form of the surrounding member used in Embodiment 1 of the battery of the present invention.

  As shown in FIG. 7, fixing location forming portions 22 and 23 are formed on the surrounding member 20 that surrounds at least a part of the outer surface of the exterior body 14 of the laminated battery 10 (FIG. 1A), and the fixing is performed. Fixed locations 24 and 25 such as through holes may be formed in the location forming portions 22 and 23. In this case, the surrounding member 20 includes a tubular surrounding portion 21 and fixed portion forming portions 22 and 23.

  In summary, the unit battery 1 configured as described above surrounds an exterior body 14 made of a flexible film that houses the unit cell 11 and at least a part of the outer surface of the exterior body 14, and changes its shape. And the surrounding member 20 configured to hold the exterior body 14 by contacting at least a part of the outer surface of the exterior body 14. In this way, the surrounding member 20 is configured to come into contact with at least a part of the outer surface of the exterior body 14 due to the shape change to hold the exterior body 14, so that a physical fixing member such as a screw, a bolt, or a rivet is attached. The fixing locations 33, 34, 24, 25 are fixed to the surrounding member 20 by fixing the fixing location forming members 31, 32 to be attached to the surrounding member 20 or by forming the fixing location forming portions 22, 23 on the surrounding member 20. Can be granted. Thereby, it is possible to easily fix or position the single or plural laminated batteries 10 without using a chemical fixing means such as an adhesive or a pressure-sensitive adhesive tape, thereby improving workability.

  Further, as shown in FIG. 5, the unit cell 1 is composed of a first exterior body 14 made of a flexible film that houses the first unit cell, and a flexible film that houses the second unit cell. Surrounds at least part of the outer surface of the second exterior body 14 and the first and second exterior bodies 14, and contacts at least part of the outer surface of the first and second exterior bodies 14 by the shape change And a surrounding member 20 configured to hold the first and second exterior bodies 14. As described above, the surrounding member 20 is configured to come into contact with at least a part of the outer surface of the first and second exterior bodies 14 due to the shape change and hold the first and second exterior bodies 14. The member 20 can surround and hold the plurality of laminated batteries 10. Thereby, the some laminated battery 10 can be handled as a single form. Also, fixing location forming members 31, 32 for attaching physical fixing members such as screws, bolts, rivets, etc. are fixed to the surrounding member 20, or fixing location forming portions 22, 23 are formed on the surrounding member 20. The fixing portions 33, 34, 24, and 25 can be applied to the surrounding member 20, so that a plurality of laminated batteries 10 can be fixed or positioned without using a chemical fixing means such as an adhesive or an adhesive tape. It can be performed easily and workability can be improved.

  Further, the surrounding member 20 can easily surround and hold the exterior body 14 if the exterior body 14 is held by coming into contact with at least a part of the outer surface of the exterior body 14 by heat shrinkage. be able to. Further, the holding performance of the surrounding member 20 can be improved by increasing the adhesion between the surrounding member 20 and the outer surface of the exterior body 14.

  As shown in FIG. 2, the unit cell 1 is electrically connected to each of the positive electrode and the negative electrode of the unit cell 11 (FIG. 1A) and protrudes from the exterior body 14 and extends from the exterior body 14. The length in which the surrounding member 20 extends along the direction in which the positive electrode connection terminal 12 and the negative electrode connection terminal 13 extend is preferably shorter than the length of the exterior body 14. By configuring in this way, the material of the surrounding member 20 (FIG. 1 (B)) necessary for fixing the fixing location forming members 31, 32 for attaching the fixing means or positioning means of the laminated battery 10 or The material of the surrounding member 20 (FIG. 7) required for forming the fixing portion forming portions 22 and 23 can be reduced.

  As shown in FIG. 1 (B), fixing location forming members 31, 32 in which fixing locations 33, 34 used for fixing the unit battery 1 to other members are formed on the outer surface of the surrounding member 20. Since they are firmly fixed, the laminated battery 10 can be easily fixed or positioned by attaching a fixing member such as a rod-like member 41, a rivet or a bolt to the fixing location forming members 31 and 32. Moreover, since the fixing location forming members 31 and 32 are independent from the exterior body 14 that houses the unit cell 11, the shape of the fixing location forming members 31 and 32 can be arbitrarily changed, and can be fixed or positioned. The degree of freedom of structure is increased. Furthermore, since the fixing location forming members 31 and 32 are independent from the outer package 14 that accommodates the unit cell 11, even if stress is generated in the fixing location forming members 31 and 32, damage to the unit cell 11 is small. .

  As shown in FIG. 7, the fixing portions 24 and 25 used for fixing the unit battery 1 to other members are formed in the surrounding member 20, and therefore the rod-shaped member 41 is fixed to the fixing portions 24 and 25. The laminated battery 10 can be easily fixed or positioned by attaching a fixing member such as a rivet or a bolt. Even in this case, since the fixing points 24 and 25 are independent from the exterior body 14 that accommodates the unit cell 11, the shape of the fixing points 24 and 25 can be arbitrarily changed, and is used for fixing or positioning. The degree of freedom of structure is increased. Furthermore, since the fixing locations 24 and 25 are independent from the outer package 14 that houses the unit cell 11, even if stress is generated in the fixing locations 24 and 25, the unit cell 11 is less damaged.

  In the assembled battery 2 shown in FIG. 6, each laminated battery 10 can be handled as a single battery in a form of being surrounded and held by the enclosing member 20, so that a plurality of batteries are included in the assembled battery 2. Can be handled separately. As a result, it is possible to easily remove and replace only the defective battery or only the deteriorated battery in the assembled battery 2, so that the assembled battery 2 having excellent maintainability can be obtained. . Further, since an extra member such as a cushioning material is not incorporated in the casing of the assembled battery 2, the space utilization efficiency can be improved. For example, a rod-like member can be used as the fixing member at the fixing portions 33, 34, 24, and 25. By attaching 41, a plurality of batteries can be accommodated exactly in the housing. Furthermore, since the mutual fixation between the individual batteries and the electrical connection of the electrode connecting members can be performed collectively, the number of work steps in manufacturing the assembled battery 2 can be reduced.

(Embodiment 2)
FIG. 8 is a perspective view (A) showing a laminated battery applicable to Embodiment 2 of the battery of the present invention, and a perspective view (B) showing an enclosing member used in Embodiment 2 of the battery of the present invention, It is a top view (C) which shows the fixing | fixed location formation member used for Embodiment 2 of the battery of this invention.

  As shown in FIG. 8 (A), the laminated battery 10 is the same as that shown in FIG. 1 (A). As shown in FIG. 8B, the enclosing member 20 is configured only by an enclosing portion formed in a tubular shape as an example. The material of the surrounding member 20 is the same as that of the surrounding member 20 of the first embodiment.

  As shown in FIG. 8C, the fixing location forming member 30 is composed of a flat plate-like main body portion 35 and protrusions 36a, 36b, 36c, 36d formed so as to protrude from the four corners of the main body portion 35. Is done. Fixed portions 37a, 37b, 37c, and 37d are formed on the protrusions 36a, 36b, 36c, and 36d of the fixed portion forming member 30. For example, a rod-shaped member as a positioning member, a rivet as a fixed member, and the like are inserted. Through holes and screw holes for inserting screws, bolts and the like as fixing members are formed. The fixing location forming member 30 in which the fixing locations 37 a, 37 b, 37 c, 37 d are formed is a functional member used for positioning and fixing the laminated battery 10. The material of the fixing point forming member 30 is the same as that of the fixing point forming members 31 and 32 of the first embodiment.

  FIG. 9 is a perspective view showing Embodiment 2 of the battery of the present invention. In addition, in FIG. 9, illustration of the heat welding part 141 of the exterior body 14 is abbreviate | omitted.

  As shown in FIG. 9, a part of the outer surface of both the exterior body 14 and the fixing part forming member 30 of the laminate type battery 10 shown in FIG. The encircling member 20 shown is placed. For example, when the surrounding member 20 is made of PET having a thickness of 30 to 200 μm as a heat-shrinkable material and the fixing portion forming member 30 is made of polycarbonate, the surrounding member 20 is left in an atmosphere heated to about 120 ° C. as an example for about 10 seconds. By contracting the surrounding member 20, the outer body 14, the surrounding member 20, and the fixed portion forming member 30 are integrated with each other by bringing them into contact with part of the outer surfaces of both the outer body 14 and the fixed portion forming member 30. Make it. In this case, the surrounding member 20 is disposed so as to cover the central portion of the exterior body 14 and expose both end portions. Both ends of the main body 35 and the protrusions 36 a, 36 b, 36 c, and 36 d are arranged so as to protrude to the outside of the surrounding member 20. In this way, the surrounding member 20 surrounds a part of the outer surface of both the exterior body 14 and the fixed location forming member 30, and the outer surface of both the exterior body 14 and the fixed location forming member 30 due to the shape change. By holding the exterior body 14 in contact with a part, the unit battery 3 that can be handled as a single form is configured as the second embodiment of the present invention. Note that the protruding portions 36a, 36b, 36c, and 36d in which the fixing portions 37a, 37b, 37c, and 37d are formed may be bent in one direction as shown in FIG.

  FIG. 10 is a perspective view showing Embodiment 2 of an assembled battery configured by combining a plurality of unit batteries shown in FIG.

  As shown in FIG. 10, each of the fixing points 37a, 37b, 37c, and 37d (FIG. 9) of the fixing point forming member 30 (FIG. 8C) of each unit cell is a positioning hole. It arrange | positions so that it may align with the hole 44 formed in the rod-shaped member 43 as a member or a fixing member, The rivet and bolt which are not shown in figure are inserted in the hole 44, and are fixed. Thus, for example, the assembled battery 4 that can be positioned and fixed in the housing is configured as the component member.

  11 and 12 are cross-sectional views seen from the directions along the XI-XI line and the XII-XII line of FIG. 9, respectively.

  As shown in FIG. 11, in one embodiment, the surrounding member 20 may be arranged so as to hold the heat welded portion 141 of the exterior body 14 as it is, and another embodiment as shown in FIG. In the form, the surrounding member 20 may be disposed so as to bend and hold the heat welding portion 141 of the exterior body 14.

  In summary, in the unit battery 3 configured as described above, a part of the outer surface of the fixed portion forming member 30 is fixed by being surrounded by the surrounding member 20, so that the fixed portion forming member 30 has a rod shape. By attaching a fixing member such as the member 43, a rivet, or a bolt, the laminated battery 10 can be easily fixed or positioned. Moreover, since the fixed location forming member 30 is independent from the outer package 14 that houses the unit cell 11, the shape of the fixed location forming member 30 can be arbitrarily changed, and the degree of freedom of structure for fixing or positioning. Becomes higher. Furthermore, since the fixing location forming member 30 is independent from the outer package 14 that houses the unit cell 11, even if stress is generated in the fixing location forming member 30, the unit cell 11 is less damaged.

  Other operational effects of the unit battery 3 of the second embodiment are the same as those of the unit battery 1 of the first embodiment described above.

(Embodiment 3)
FIG. 13 is a perspective view (A) showing a laminate type battery applicable to Embodiment 3 of the battery of the present invention, and a perspective view (B) showing an enclosing member used in Embodiment 3 of the battery of the present invention. It is a top view (C) which shows the fixing | fixed location formation member used for Embodiment 3 of the battery of this invention.

  As shown in FIG. 13A, the laminated battery 10 is the same as that shown in FIG. As shown in FIG. 13B, the surrounding member 20 is the same as that shown in FIG. As shown in FIG. 13 (C), the fixing point forming member 30 is the same as that shown in FIG. 8 (C). The material of the surrounding member 20 is the same as that of the surrounding member 20 of the first embodiment. The material of the fixing point forming members 30, 31, and 32 is the same as that of the fixing point forming members 31, 32 of the first embodiment.

  FIG. 14 is a perspective view showing Embodiment 3 of the battery of the present invention. In addition, in FIG. 14, illustration of the heat welding part 141 of the exterior body 14 is abbreviate | omitted.

  As shown in FIG. 14, as shown in FIG. 13B, a part of the outer surface of both the outer package 14 and the fixing location forming member 30 of the laminate type battery 10 shown in FIG. The encircling member 20 shown is placed. For example, when the surrounding member 20 is made of PET having a thickness of 30 to 200 μm as a heat-shrinkable material and the fixing portion forming member 30 is made of polycarbonate, the surrounding member 20 is left in an atmosphere heated to about 120 ° C. as an example for about 10 seconds. By contracting the surrounding member 20, the outer body 14, the surrounding member 20, and the fixed portion forming member 30 are integrated with each other by bringing them into contact with part of the outer surfaces of both the outer body 14 and the fixed portion forming member 30. Make it. In this case, the surrounding member 20 is disposed so as to cover the central portion of the exterior body 14 and expose both end portions. Both ends of the main body 35 and the protrusions 36 a, 36 b, 36 c, and 36 d are arranged so as to protrude to the outside of the surrounding member 20. In this way, the surrounding member 20 surrounds a part of the outer surface of both the exterior body 14 and the fixed location forming member 30, and the outer surface of both the exterior body 14 and the fixed location forming member 30 due to the shape change. By holding the exterior body 14 in contact with a part, the unit battery 5 that can be handled as a single form is configured as the third embodiment of the present invention. Note that the protrusions 36a, 36b, 36c, and 36d formed with the fixing portions 37a, 37b, 37c, and 37d may be bent in one direction as shown in FIG.

  The unit battery 5 configured as described above can achieve the same effects as the unit battery 3 of the second embodiment described above, and can be positioned and fixed as compared with the unit battery 3 of the second embodiment. You can increase the number of places.

(Embodiment 4)
FIG. 15 is a perspective view showing Embodiment 4 of the battery of the present invention. In addition, in FIG. 15, illustration of the heat welding part 141 of the exterior body 14 is abbreviate | omitted.

  As shown in FIG. 15, the unit battery 6 of the fourth embodiment is the same as the embodiment shown in FIG. 2 except that the positive electrode connection terminal 12 and the negative electrode connection terminal 13 protrude from the same side of the exterior body 14. 1 unit battery 1 has the same configuration. The unit battery 6 configured as described above can achieve the same effects as the unit battery 1 of the first embodiment described above, and when a plurality of unit batteries 6 are combined, the positive electrode connection terminal 12 and the negative electrode Since the side part of the unit battery 6 in which the connection terminals 13 are arranged intersects with the side part of the unit battery 6 in which the fixing point forming members 31 and 32 are arranged, in this example, it is arranged so as to be orthogonal. In the assembled battery, it is preferable to arrange the wiring connected to the positive and negative electrode connection terminals for charging and discharging and the constituent members for positioning and fixing the battery in the housing.

(Embodiment 5)
FIG. 16 is a perspective view showing Embodiment 5 of the battery of the present invention. In addition, in FIG. 16, illustration of the heat welding part 141 of the exterior body 14 is abbreviate | omitted.

  As shown in FIG. 16, in the unit battery 7 of the fifth embodiment, the positive electrode connection terminal 12 and the negative electrode connection terminal 13 are arranged so as to protrude from the opposite side portions of the exterior body 14. , Notches 26 and 27 are formed in portions close to each of the positive electrode connecting terminal 12 and the negative electrode connecting terminal 13. Other configurations are the same as those of the unit battery 1 of the first embodiment shown in FIG. The unit battery 7 configured as described above can achieve the same operation and effect as the unit battery 1 of the first embodiment described above, and the heat generated in the unit cell 11 is exposed by the notches 26 and 27. Since it can discharge | release outside from the outer surface of the exterior body 14 which performed, the heat dissipation of a battery can be improved.

(Embodiment 6)
FIG. 17 is a perspective view showing Embodiment 6 of the battery of the present invention. In FIG. 17, the illustration of the heat welding part 141 of the exterior body 14 is omitted.

  As shown in FIG. 17, in the unit battery 8 of the sixth embodiment, the positive electrode connection terminal 12 and the negative electrode connection terminal 13 are arranged so as to protrude from opposite side portions of the exterior body 14, but the surrounding member 20. A plurality of through holes 28 that reach the outer surface of the exterior body 14 from the outside of the surrounding member 20 are formed. Other configurations are the same as those of the unit battery 1 of the first embodiment shown in FIG. The unit battery 8 configured as described above can achieve the same operation and effect as the unit battery 1 of the first embodiment described above, and externally dissipates heat generated in the unit cell 11 through the plurality of through holes 28. Since it can discharge | release to the outer side of the surrounding member 20 from the outer surface of the body 14, the heat dissipation of a battery can be improved.

  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.

  The battery of the present invention is applied not only to a power storage battery for power plants and homes as a backup power source, but also to a laminated battery used as a power source battery for vehicles such as automobiles, motorcycles, trains and carts. And is particularly suitable for laminated batteries with severe vibration.

They are a perspective view (A) which shows the laminated battery applicable to Embodiment 1 of the battery of this invention, and a perspective view (B) which shows the surrounding member used for Embodiment 1 of the battery of this invention. It is a perspective view which shows Embodiment 1 of the battery of this invention. It is sectional drawing seen from the direction along the III-III line of FIG. It is sectional drawing seen from the direction along the IV-IV line of FIG. It is a perspective view which shows another Embodiment 1 of the battery of this invention. It is a perspective view which shows Embodiment 1 of the assembled battery comprised by combining several unit batteries shown by FIG. It is a perspective view which shows another form of the surrounding member used for Embodiment 1 of the battery of this invention. The perspective view (A) which shows the laminate type battery applicable to Embodiment 2 of the battery of this invention, The perspective view (B) which shows the surrounding member used for Embodiment 2 of the battery of this invention, It is a top view (C) which shows the fixing | fixed location formation member used for Embodiment 2 of a battery. It is a perspective view which shows Embodiment 2 of the battery of this invention. It is a perspective view which shows Embodiment 2 of the assembled battery comprised by combining multiple unit batteries shown by FIG. It is sectional drawing seen from the direction along the XI-XI line of FIG. It is sectional drawing seen from the direction along the XII-XII line | wire of FIG. The perspective view (A) which shows the laminate type battery applicable to Embodiment 3 of the battery of this invention, The perspective view (B) which shows the surrounding member used for Embodiment 3 of the battery of this invention, It is a top view (C) which shows the fixing | fixed location formation member used for Embodiment 3 of a battery. It is a perspective view which shows Embodiment 3 of the battery of this invention. It is a perspective view which shows Embodiment 4 of the battery of this invention. It is a perspective view which shows Embodiment 5 of the battery of this invention. It is a perspective view which shows Embodiment 6 of the battery of this invention. It is a perspective view which shows the conventional laminate type battery. It is a perspective view which shows one example of the conventional battery laminated body.

Explanation of symbols

  1, 3, 5, 6, 7, 8: unit cell, 2, 4: assembled battery, 10: laminate type battery, 11: unit cell, 12: positive electrode connection terminal, 13: negative electrode connection terminal, 14: exterior body, 141: thermal welding part, 20: surrounding member, 22, 23: fixing part forming part, 24, 25, 33, 34: fixing part, 26, 27: notch, 28: through hole, 30, 31, 32: fixing Location forming members 41 and 43: rod-shaped members.

Claims (10)

An exterior body made of a flexible film containing the unit cells;
An enclosing member that surrounds at least a part of the outer surface of the exterior body and is configured to hold the exterior body in contact with at least a portion of the outer surface of the exterior body by a shape change;
With battery. A plurality of exterior bodies each made of a flexible film containing a unit cell;
An enclosing member that surrounds at least a part of the outer surfaces of the plurality of exterior bodies and contacts the at least a part of the outer surfaces of the plurality of exterior bodies by a shape change to hold the plurality of exterior bodies. When,
With battery.   3. The battery according to claim 1, wherein the surrounding member is configured to contact the at least part of the outer surface of the exterior body by heat shrinkage and hold the exterior body.   The battery according to any one of claims 1 to 3, wherein the surrounding member is formed with a through-hole that reaches the outer surface of the exterior body from the outside of the surrounding member. A positive connection terminal and a negative connection terminal that are electrically connected to each of the positive electrode and the negative electrode of the unit cell and extend from the exterior body;
The battery according to any one of claims 1 to 4, wherein the surrounding member has a notch formed in a portion close to at least one of the positive electrode connecting terminal and the negative electrode connecting terminal. A positive connection terminal and a negative connection terminal that are electrically connected to each of the positive electrode and the negative electrode of the unit cell and extend from the exterior body;
6. The length of the surrounding member extending along the extending direction of the positive electrode connection terminal and the negative electrode connection terminal is shorter than the length of the exterior body, according to claim 1. Battery. A first fixing portion forming member formed with a fixing portion used for fixing the battery to another member;
The battery according to any one of claims 1 to 6, wherein the first fixing portion forming member is fixed to an outer surface of the surrounding member.   The battery according to any one of claims 1 to 6, wherein a fixing portion used for fixing the battery to another member is formed in the surrounding member. A second fixing portion forming member formed with a fixing portion used for fixing the battery to another member;
The surrounding member surrounds a part of the outer surface of both the exterior body and the second fixed location forming member, and the outer surface of both the exterior body and the second fixed location forming member by shape change The battery according to claim 1, wherein the battery is held in contact with a part of the battery.   An assembled battery comprising a plurality of the batteries according to any one of claims 7 to 9, wherein the plurality of batteries are connected by attaching a fixing member to the fixing portion.

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