JP2004055348A - Battery pack, composite battery pack, and vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack capable of facilitating the replacement of a flat battery in repairing it. <P>SOLUTION: A fixing device 5 is composed by disposing, on a flat fixing base part 51, engagement members 52 each having a nearly arrow-like shape, a damping material 53 and openings 54. When the fixing base 51 is folded around shafts 51a, the engagement members 52 are inserted into the openings 54. By catching terminals 104 and 105 of the two flat batteries 10 stacked so that the positive electrode terminal 104 of one-side flat battery are set in the same direction as the positive electrode terminal 104 of the other-side flat battery by the damping material 53 disposed oppositely to them, and by engaging the engagement members 52 with the openings 54, the flat batteries 10 are fixed in this battery pack by the fixing device 5. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
【Technical field】
The present invention relates to an assembled battery including a plurality of thin batteries, and more particularly to an assembled battery that allows easy replacement of thin batteries.
[0002]
[Background Art]
Along with the diversification of usage modes and usage conditions of thin batteries, high voltage and high capacity have been achieved by configuring an assembled battery with a plurality of thin batteries. However, when it is necessary to replace the thin battery incorporated in the battery pack due to a failure of the thin battery or the like, the thin battery cannot be easily removed from the battery pack, and it is difficult to repair the battery pack. there were.
[0003]
DISCLOSURE OF THE INVENTION
The present invention relates to an assembled battery including a plurality of thin batteries, and an object of the present invention is to provide an assembled battery in which thin batteries can be easily replaced.
[0004]
In order to achieve the above object, according to the present invention, the outer peripheral edges of two sheet-shaped sealing means having a synthetic resin layer are joined, and a power generation element is sealed inside the sealing means. A battery pack comprising a plurality of thin batteries each having a positive electrode terminal and a negative electrode terminal connected to the power generating element derived from the outer peripheral edge, wherein a fixing means capable of fixing and releasing the positive terminal or the negative electrode terminal of the thin battery is provided. The present invention provides an assembled battery having the same (see claim 1).
[0005]
Further, according to the present invention, the fixing means has a damping material at a position in contact with the positive electrode terminal and the negative electrode terminal of the thin battery, and holds the positive electrode terminal or the negative electrode terminal of the thin battery by the damping material. Thus, it is more preferable to support the thin battery (see claim 2).
[0006]
In the present invention, the assembled battery is provided with fixing means capable of fixing and opening the positive terminal or the negative electrode terminal of the thin battery, and the thin battery is fixed to the assembled battery by the fixing means. Removal becomes easy.
[0007]
In addition, a damping material is disposed at a position where the fixing means contacts the positive electrode terminal or the negative electrode terminal, and the thin battery is supported by sandwiching the positive terminal or the negative electrode terminal of the thin battery with the damping material. It is possible to significantly reduce the transmission of the vibration applied from the battery to the thin battery.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0009]
First embodiment
FIG. 1A is a plan view showing the entire thin battery according to the first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line II-II of FIG. 1A. FIG. 1 shows one thin battery (unit battery), and an assembled battery having a desired voltage and capacity is formed by connecting a plurality of the thin batteries 10.
[0010]
First, the overall configuration of a thin battery 10 according to an embodiment of the present invention will be described with reference to FIG. 1. The thin battery 10 of this example is a lithium-based thin secondary battery, and includes two positive plates 101 and It is composed of five separators 102, two negative plates 103, a positive terminal 104, a negative terminal 105, an upper battery outer member 106, a lower battery outer member 107, and an electrolyte (not shown). Among these, the positive electrode plate 101, the separator 102, the negative electrode plate 103, and the electrolyte are particularly referred to as a power generation element 109.
[0011]
The number of the positive electrode plate 101, the separator 102, and the negative electrode plate 103 is not limited at all, and the power generating element 109 can be constituted by one positive electrode plate 101, three separators 102, and one negative electrode plate 104. . If necessary, the number of the positive electrode plate, the negative electrode plate, and the number of separators can be selected and configured.
[0012]
The positive electrode plate 101 constituting the power generating element 109 is composed of a positive electrode active material such as a metal oxide, a conductive material such as carbon black, and an adhesive such as an aqueous dispersion of polytetrafluoroethylene in a weight ratio of, for example, 100%. : A mixture of 3:10 was applied to both sides of a metal foil such as an aluminum foil as a positive electrode current collector, dried, rolled, and then cut into a predetermined size. The mixing ratio of the aqueous dispersion of polytetrafluoroethylene is the solid content.
[0013]
As the positive electrode active material, for example, lithium nickelate (LiNiO₂), Lithium manganate (LiMnO)₂), Lithium cobaltate (LiCoO)₂) And chalcogen (S, Se, Te) compounds. These materials relatively easily diffuse the heat generated inside the thin battery, reduce the expansion due to the expansion of the terminal due to heat transfer to the terminal, and minimize the tensile stress transmitted from the terminal to the battery exterior member described later. It becomes.
[0014]
The negative electrode plate 103 constituting the power generation element 109 is formed of, for example, an amorphous carbon, a non-graphitizable carbon, a graphitizable carbon, or a negative electrode active material that occludes and releases lithium ions of a positive electrode active material, such as graphite. An aqueous dispersion of styrene-butadiene rubber resin powder as a precursor material for the organic fired body is mixed at, for example, a solid content ratio of 100: 5, dried, and then pulverized to carry carbonized styrene-butadiene rubber on the carbon particle surfaces. The main material is mixed with a binder such as an acrylic resin emulsion at a weight ratio of 100: 5, for example, and this mixture is used as a metal foil such as a nickel foil or a copper foil as a negative electrode current collector. Is dried, rolled, and then cut into a predetermined size.
[0015]
In particular, when amorphous carbon or non-graphitizable carbon is used as the negative electrode active material, the flatness of the potential during charge and discharge is poor, and the output voltage decreases with the amount of discharge, so it is not suitable for the power supply of communication equipment and office equipment. However, when used as a power source for an electric vehicle or the like, there is no sharp drop in output, which is advantageous.
[0016]
Further, the separator 102 of the power generation element 109 prevents short-circuit between the positive electrode plate 101 and the negative electrode plate 103 described above, and may have a function of retaining an electrolyte. The separator 102 is a microporous film made of, for example, a polyolefin such as polyethylene (PE) or polypropylene (PP). When an overcurrent flows, the heat generated by the separator 102 causes pores in the layer to be closed and cuts off the current. It also has
[0017]
Note that the separator 102 of the present invention is not limited to a single-layer film of polyolefin or the like, and a three-layer structure in which a polypropylene film is sandwiched by a polyethylene film, or a laminate of a polyolefin microporous film and an organic nonwoven fabric can also be used. . By forming the separator 102 into multiple layers, various functions such as a function of preventing an overcurrent, a function of retaining an electrolyte, and a function of maintaining the shape of the separator (improving rigidity) can be provided. Further, a gel electrolyte, an intrinsic polymer electrolyte, or the like can be used instead of the separator 102.
[0018]
The above-described power generation elements 109 are stacked in such a manner that the positive electrode plate 101 and the negative electrode plate 103 are alternately arranged from the top and the separator 102 is positioned between the positive electrode plate 101 and the negative electrode plate 103. One separator 102 is stacked on each of the upper and lower parts. Each of the two positive plates 101 is connected to a metal foil positive terminal 104 via a positive current collector 104a, while the two negative plates 103 are connected to a negative current collector 105a. Is connected to the negative electrode terminal 105 also made of metal foil. Note that the positive electrode terminal 104 and the negative electrode terminal 105 are not particularly limited as long as they are electrochemically stable metal materials. Examples of the positive electrode terminal 104 include aluminum, an aluminum alloy, copper, and nickel. May be nickel, copper, stainless steel, iron or the like. These metals are particularly suitable as components of a thin battery in terms of metal resistance, coefficient of linear expansion, and resistivity.Even when the operating temperature is changed, the tensile stress transmitted from the terminal to the battery exterior member described later is also reduced. It is possible to suppress as much as possible. Further, in each of the positive-side current collector 104a and the negative-side current collector 105a of the present example, an aluminum foil, a nickel foil, a copper foil, and an iron foil constituting the current collector of the positive electrode plate 104 and the negative electrode plate 105 are extended. However, the current collectors 104a and 105a may be formed of separate materials and components.
[0019]
The power generation element 109 is sealed by the upper battery outer member 106 and the lower battery outer member 107 (sealing means). Although not shown, the upper battery exterior member 106 in the embodiment of the present invention includes three layers in the order of a first resin layer, a metal layer, and a second resin layer from the inside to the outside of the thin battery 10. It is laminated. These three layers are laminated over the entire surface of the upper battery exterior member 106, and the first resin layer is made of, for example, an electrolytic solution resistant material such as polyethylene, modified polyethylene, polypropylene, modified polypropylene, and ionomer, and heat fusion. It is a resin film with excellent properties. The second resin layer is, for example, a resin film having excellent electric insulation such as a polyamide resin or a polyester resin. The metal layer is, for example, a metal foil such as aluminum. Therefore, the upper battery exterior member 106 and the lower battery exterior member 107 are formed by laminating one surface of a metal foil such as aluminum (the inner surface of a thin battery) with a resin such as polyethylene, modified polyethylene, polypropylene, modified polypropylene, and ionomer. Then, the other surface (the outer surface of the thin battery) is formed of a flexible material such as a resin-metal thin film laminate in which a polyamide-based resin, a polyester-based resin, or the like is laminated. As described above, when the battery exterior member includes the metal layer in addition to the resin layer, the strength of the battery exterior member can be improved.
[0020]
The lower battery exterior member 107 has a structure similar to that of the upper battery exterior member 106. Although not particularly shown, the first resin layer, the metal layer, the second Three layers are laminated in the order of the resin layer. Similar to the first resin layer of the upper battery exterior member 106, the first resin layer of the lower battery exterior member 107 is made of, for example, an electrolytic solution such as polyethylene, modified polyethylene, polypropylene, modified polypropylene, and ionomer, and heat fusion. It is a resin film with excellent properties. The metal layer of the lower battery exterior member 107 is, for example, a metal foil of aluminum or the like, like the metal layer of the upper battery exterior member 106. The second resin layer of the lower battery exterior member 107 is a resin film having excellent electrical insulation properties, such as a polyamide resin or a polyester resin, like the second resin layer of the upper battery exterior member 106.
[0021]
As described above, by forming the inner surface of the battery exterior member (the inner surface of the thin battery) with a resin such as polypropylene, modified polypropylene, polyethylene, modified polyethylene, and ionomer, satisfactory fusion with a metal terminal is achieved. It is possible to secure the property.
[0022]
Further, as shown in FIG. 1, the positive terminal 104 is led out from one end of the sealed battery outer casings 106 and 107. In order to maintain a sealing property in the thin battery 10, a seal made of polyethylene, polypropylene, or the like is provided at a portion where the positive electrode terminal 104 and the battery exteriors 106 and 107 are in contact with each other. A film can be interposed by a method such as heat fusion.
[0023]
Similarly, a negative electrode terminal 105 is led out from the other end of the sealed battery casings 106 and 107. Here, similarly to the positive terminal 104 side, the negative terminal 105 and the battery casings 106 and 107 are connected. A seal film may be interposed in a portion where the contact is made. In any of the positive electrode terminal 104 and the negative electrode terminal 105, it is preferable that the seal film is formed of the same resin as the resin forming the battery casings 106 and 107 from the viewpoint of heat fusion.
[0024]
These battery exterior members 106 and 107 wrap the above-described power generation element 109, the positive-side current collector 104 a, a part of the positive terminal 104, and the negative-side current collector 105 a and a part of the negative terminal 105. After injecting a liquid electrolyte in which a lithium salt such as lithium perchlorate or lithium borofluoride is dissolved in an organic liquid solvent into a space formed by 106 and 107, the outside of the upper battery exterior member 106 and the lower battery exterior member 107 is injected. The peripheral heat-sealed region 110 is heat-sealed by a hot press and sealed.
[0025]
Examples of the organic liquid solvent include ester solvents such as propylene carbonate (PC), ethylene carbonate (EC), and dimethyl carbonate (DMC). However, the organic liquid solvent of the present invention is not limited thereto. An organic liquid solvent obtained by mixing and preparing an ether-based solvent such as γ-butylactone (γ-BL), diethoxyethane (DEE) or the like with an ester-based solvent can also be used.
[0026]
It is preferable that the thin battery 10 sealed in this way has a total thickness of 1 to 10 [mm]. By setting the thickness of the thin battery to 10 mm or less, heat is hardly trapped inside the thin battery, the possibility of transmitting stress to the interface of the battery exterior member is reduced, and the effect of thermal degradation of the battery is reduced. Is also reduced. Further, by setting the thickness of the thin battery to 1 mm or more, a sufficient capacity can be secured, and economic efficiency can be increased.
[0027]
Next, a fixing device 5 for fixing the thin battery 10 to the assembled battery 20 when the assembled battery 20 is configured by the thin battery 10 will be described.
[0028]
2A is a plan view of the fixing device according to the first embodiment of the present invention, and FIG. 2B is a partial side view of the fixing device before fixing the terminals of the thin battery, and FIG. () Is a partial side view of the fixing device after fixing the terminals of the thin battery.
[0029]
As shown in FIG. 2, the fixing device 5 according to the first embodiment of the present invention is a means for supporting the positive terminal 104 and the negative terminal 105 of the thin battery 10 and fixing the thin battery 10 to the assembled battery 20. The positive terminal 104 or the negative terminal 105 of the two thin batteries 10 can be fixed at the same time, and includes a fixed base 51, an engaging member 52, and a damping material 53.
[0030]
The fixed base portion 51 is a substantially rectangular flat plate made of a conductive material that can be bent around the shaft 51a, and has an engaging member 52, a damping material 53, and an opening 54 disposed on the surface thereof. ing.
[0031]
The engagement member 52 has a substantially arrow-shaped shape as shown in FIG. 2 (B), and the fixed base portion 51 is bent about the shaft 51a to face the fixed base portion 51 facing each other. It is located at each corner of one surface. On the other hand, an opening 54 is formed at each corner of the other surface of the fixed base portion 51 opposite to the fixed base portion 51. The opening 54 is formed by a substantially arrow-shaped X-axis in FIG. It has a width slightly larger than the maximum width in the direction, and has a center at a position eccentric to the center of the engagement member 52 in the Y-axis direction. When the fixed base portion 51 is bent about the shaft 51a, the engaging member 52 is inserted into the opening 54, and the barb provided on the engaging member 52 engages with the edge of the opening 54.
[0032]
The damping material 53 is a means that simultaneously supports the positive terminals 104 of the two thin batteries 10 and absorbs vibration or the like applied from the outside to the thin batteries 10 by its elastic characteristics. And a metal foil composed of a mechanical spring, a rubber-based elastic body, an elastomer-based elastic body, or the like having a spring constant smaller than the spring constant of the negative electrode terminal 105, and having a surface electrically connected to the fixed base portion 51 by a lead wire 55. And the like. The damping material 53 is a positive electrode terminal to be fixed as shown by a broken line in FIG. 2A on each surface of the fixed base portion 51 where the fixed base portion 51 is bent about the shaft 51a and faces each other. It is provided at a position in contact with 104 or the negative electrode terminal 105. The connecting portion 53a of the damping material 53 is preferably in contact with an area of 50% or more of a portion of the terminals 104 and 105 derived from the battery exterior members 106 and 107. There is a high possibility that a connection failure occurs between the connection portion 105 and the connection portion 53a, and the connection resistance increases.
[0033]
As shown in FIG. 2B, when fixing the positive terminals 104 of the two thin batteries 10 with the fixing device 5, the other thin batteries 10 are inverted with respect to the one thin battery 10 and the other thin batteries 10 are inverted. Are stacked so that the lower surface of the thin battery 10 is aligned with the lower surface of the one thin battery 10. Then, the positive terminal 104 of one thin battery 10 and the positive terminal 104 of the other thin battery 10 that is inverted in the vertical direction are located between the damping members 53 facing each other on the surface of the fixed base portion 51. . Then, the fixed base 51 is bent in the direction of the arrow in FIG. 2B, and the surface of the fixed base 51 on which the damping material 53 is not provided is pressed in the negative Y-axis direction in FIG.
[0034]
Next, as shown in FIG. 2C, the engaging members 52 are inserted into the corresponding openings 54 until the barbs of the engaging members 52 sufficiently penetrate the openings 54. When the engagement member 52 and the opening 54 are engaged, the positive terminals 104 of the two thin batteries 10 are sandwiched and supported between the damping members 53 facing each other, and the two thin batteries 10 are fixed by the fixing device 5. Is done. By fixing the thin battery by the fixing device having the damping material having a spring constant smaller than the spring constant of the terminal, transmission of vibration to the thin battery can be reduced, and the failure rate of the thin battery can be reduced. Reduction can be achieved.
[0035]
To remove the thin battery 10 from the fixing device 5, the engaging member 52 is pushed in the positive direction of the X-axis in FIG. And release the lock.
[0036]
The fixing device 5 is connected to another fixing device 5 by the positive bus bar 21a. The positive terminal 104 of the thin battery 10 fixed by the fixing device 5 includes a connecting portion 53a of the damping material 53, a lead wire 55, Via the bus bar 21a, it is electrically connected to the positive electrode terminal 104 of the thin battery 10 fixed to another fixing device 5. When the positive electrode terminal 104 of the thin battery 10 is fixed by the fixing device 5, the positive electrode side bus bar 104 is simultaneously sandwiched from above and below by the connecting portions 53 a, 53 a of the damping materials 53, 53, so that the positive electrode terminal 104 and the positive electrode side bus bar 21 a May be directly connected electrically to connect the thin battery 10 to another thin battery 10 without using the lead wire 55. In this case, the fixed base 51 does not need to be made of a conductive material, and may be formed of, for example, a non-conductive resin.
[0037]
2 (B) and 2 (C) are partial side views on the positive terminal side, the fixing device on the negative terminal side can also be attached and detached in the same manner, and the thin battery 10 fixed by the fixing device 5 The negative electrode terminal 105 is electrically connected to the negative electrode terminal 105 of the thin battery 10 fixed to another fixing device 5 via the connection portion 53a of the damping material 53, the lead wire 55, and the negative electrode side bus bar 21b. .
[0038]
As described above, by fixing the thin battery with the detachable fixing device when the thin battery is incorporated into the assembled battery, for example, when the thin battery inside the assembled battery fails, the thin battery can be easily replaced. This makes it possible to extend the life of the battery pack itself. Further, if it is difficult or impossible to replace the thin battery incorporated in the assembled battery, it is necessary to improve the quality of the thin battery and the assembled battery and to extremely reduce the failure rate, which is one of the causes of cost increase. Although such replacement is possible, the cost of the assembled battery can be reduced.
[0039]
Hereinafter, an assembled battery formed by combining a plurality of the above-described thin batteries and a composite assembled battery formed by combining a plurality of the assembled batteries will be described.
[0040]
3A and 3B are views showing the battery pack according to the first embodiment of the present invention, wherein FIG. 3A is a plan view, FIG. 3B is a front view, FIG. 3C is a side view, and FIG. FIG. 5A is a plan view of the composite battery pack shown in FIG. 4, FIG. 5B is a front view of the composite battery pack shown in FIG. 4, and FIG. (C) is a side view of the composite battery pack of FIG. 4, and FIG. 6 is a schematic view of the composite battery pack according to the first embodiment of the present invention mounted on a vehicle.
[0041]
As shown in FIG. 3, the battery pack 20 according to the first embodiment of the present invention includes ten thin batteries 10 a to 10 j and a positive electrode terminal 104 or a negative electrode terminal 105 of each of the thin batteries 10 a to 10 j. It is composed of ten fixing devices 5, a positive electrode side bus bar 21 a and a negative electrode side bus bar 22 b, assembled battery terminals 22 and 23, and an assembled battery cover 25. Note that FIGS. 5B and 5C do not show the fixing device 5 and the bus bars 21a and 21b.
[0042]
The ten thin batteries 10a to 10j are supported by the corresponding fixing device 5 with each of the positive terminals 104 of the thin batteries sandwiched therebetween by using the two thin batteries as one unit by the method described with reference to FIG. Similarly, it is fixed by supporting the respective negative electrode terminals 105 with corresponding fixing devices 5 therebetween. For example, a sixth thin battery 10f is vertically inverted and stacked on the first thin battery 10a, and the positive terminal 104 of the first thin battery 10a and the positive terminal 104 of the sixth thin battery 10f are connected to each other. It is sandwiched and fixed by the fixing device 5. Similarly, the negative terminal 105 of the first thin battery 10a and the negative terminal 105 of the sixth thin battery 10f are sandwiched and fixed by another fixing device 5. In the same manner, by sandwiching each positive electrode terminal 104 or each negative electrode terminal 105 with the corresponding fixing device 5, the second thin battery 10b and the seventh thin battery 10g are fixed, and the third thin battery 10c is The eighth thin battery 10h is fixed, the fourth thin battery 10d and the ninth thin battery 10i are fixed, and the fifth thin battery 10e and the tenth thin battery 10j are fixed by the fixing device 5. ing.
[0043]
The fixing devices 5 supporting the respective positive electrode terminals 104 are connected by a positive bus bar 21a, and the positive terminals 104 held by one fixing device 5 are connected to the connecting portion 53a of the damping material 53 and the positive electrode side. It is electrically connected to the positive electrode terminal 104 held by another fixing device 5 via the bus bar 21a. Similarly, the fixing devices 5 supporting the respective negative electrode terminals 105 are connected by the negative electrode side bus bar 21b, and the negative terminal 105 held by one fixing device 5 is connected to the connecting portion 53a of the damping material 53 and It is electrically connected to the negative electrode terminal 105 sandwiched by the other fixing device 5 via the negative electrode side bus bar 21b. As a result, ten thin batteries 10a to 10j are connected in parallel by the bus bars 21a and 21b. ing.
[0044]
The positive bus bar 21a is electrically connected to a substantially cylindrical positive electrode terminal 22 for battery assembly, which is not shown, but is drawn out from the battery cover 25. Similarly, the negative bus bar 21b is It is electrically connected to a substantially cylindrical negative electrode terminal 23 for a battery assembly derived from the cover 25. When these connections are completed, the ten thin batteries 10 are inserted into the battery pack cover 25 and sealed. Further, when thin batteries are stacked as a composite battery described later, external elastic bodies 26 are attached to four corners on the lower surface of the battery pack cover 25 in order to minimize vibration between the battery packs.
[0045]
FIGS. 4 and 5A to 5C show a composite battery pack 30 including six battery packs 20 electrically connected to the battery pack 20 shown in FIG. As shown in FIGS. 4 and 5A to 5C, the composite battery pack 30 is stacked such that the terminals 22 and 23 of the battery pack 20 face the same direction. That is, the terminals 22 and 23 of the assembled battery 20 located at the m-th stage and the terminals 22 and 23 of the assembled battery 20 located at the (m + 1) -th stage face in the same direction. Then, the assembled battery 20 of the (m + 1) th stage is stacked (m: natural number). Then, the battery pack positive terminals 22 of all the battery packs 20 facing in the same direction are electrically connected by the external connection positive terminal 31 connecting the composite battery pack 30 to the outside. Similarly, the assembled battery negative terminals 23 of all the assembled batteries 20 facing in the same direction are electrically connected by the external connection negative terminal 32. As shown in the figure, the external connection positive terminal 31 has a substantially rectangular flat plate shape, and has a plurality of terminal connection holes having a diameter capable of inserting or press-fitting the assembled battery positive terminal 22. The terminal connection holes are formed at a pitch equal to the pitch between the assembled battery positive terminals 22 of the stacked battery assembly 20, and the terminal connection holes are similarly formed in the external connection negative terminal 32. I have.
[0046]
Further, an insulating cover 33 made of an insulating material is provided to cover all the connected battery terminals 22 and 23 so that the battery terminals 22 and 23 are not exposed to the outside of the composite battery 30. ing. Note that, in FIG. 4, the insulating cover 33 is illustrated in a perspective view for convenience of description, and is not illustrated in FIG. Then, the six assembled batteries 20 stacked as described above are connected to both side surfaces thereof by flat connecting members 34, and further fastened and fixed by fixing screws 35.
[0047]
As described above, this is required by configuring a battery pack in units of a predetermined number of thin batteries and further combining the battery packs of a predetermined number in units of the battery pack to form a composite battery pack. A composite battery pack suitable for capacity, voltage, and the like can be easily obtained. In addition, since the composite battery pack is configured without complicated connection, the failure rate of the composite battery pack due to poor connection can be reduced. Furthermore, when one of the thin batteries constituting the composite battery is broken or deteriorated and the thin battery needs to be replaced, the battery having the thin battery can be easily replaced.
[0048]
FIG. 6 is a schematic diagram illustrating an example in which the above-described composite battery 30 is mounted below the floor of the vehicle 1. As the vehicle 1 moves, many vibrations are generated inside the vehicle. As shown in the figure, by mounting the above-mentioned composite battery pack 30 on the vehicle, the possibility that interfacial separation occurs between the terminal of the thin battery and the battery exterior member due to the vibration is significantly reduced. It can be used effectively.
[0049]
Second embodiment
FIG. 7 is a schematic plan view of a fixing device according to a second embodiment of the present invention, FIG. 8 is a diagram showing an assembled battery according to the second embodiment of the present invention, and FIG. 8B is a front view, and FIG. 8C is a side view. The thin battery 10 according to the second embodiment of the present invention has the same structure as the thin battery described in the first embodiment.
[0050]
As shown in FIG. 7, the fixing device 5 ′ according to the second embodiment of the present invention is a means for fixing ten thin batteries 10 stacked in two stages and five rows at once, and fixing each thin battery. It also has the function of a bus bar for connecting between the terminals. The fixing device 5 ′ includes a fixing base 51, an engaging member 52, and a damping material 53.
[0051]
The fixed base portion 51 is composed of two linear support members 51c and 51d. Each of the support members 51c and 51d is rotatably supported at a fulcrum 51b at one end, and is supported at the other end. An engagement member 52 is attached to the end. Further, two substantially arrow-shaped convex members 52a of the engaging member 52 are attached to the other end of the first support member 51c, and a concave is formed at the other end of the second support member 51d. The member 52b is attached. The concave member 52b attached to the other end of the second support member 51d has an opening large enough to insert the substantially arrow shape of the convex member 52a. Then, the first support member 51c rotates toward the second support member 51 about the fulcrum 51b, and in the same manner as in the first embodiment, the barbed portion of the convex member 52a having the substantially arrow shape is concave. The fixed base 51 is fixed by engaging with the edge of the opening of the member 52b.
[0052]
Further, the first support member 51c is provided on the surface facing the second support member 51d at substantially the same pitch as the pitch at which each positive electrode terminal 104 or 105 of the thin battery 10 is located. A damping member 53 composed of a mechanical spring having a spring constant smaller than that of the positive electrode terminal 104 and the negative electrode terminal 105, a rubber-based elastic body, an elastomer-based elastic body, and the like is attached. Similarly, the second support member 51d is also provided on the surface facing the first support member 51d at substantially the same pitch as the above-described pitch from a mechanical spring, a rubber-based elastic body, an elastomer-based elastic body, or the like. The configured damping material 53 is attached.
[0053]
Further, on the surface of the first support member 51c facing the second support member 51d, a connection portion 53a such as a metal foil is provided over the entire surface including the surface of the disposed damping material 53. . Similarly, a connection portion 53a such as a metal foil is provided on the entire surface of the second support member 51d facing the first support member 51c, including the surface of the disposed damping material 53. I have. Thereby, when the terminals 104 and 105 are sandwiched by the damping material 53, the positive terminal 104 or the negative terminal 105 of one thin battery 10 is connected to the connecting portion 53a of the first supporting member 51c and the second supporting member 51d. Is electrically connected to the positive electrode terminal 104 or the negative electrode terminal 105 of another thin battery 10.
[0054]
As described above, by fixing the terminals of a plurality of thin batteries with a single fixing device having the function of a bus bar, replacement of the thin batteries is facilitated, and the bus bar is not required in forming the assembled battery. The number of parts is reduced.
[0055]
When fixing the positive electrode terminal 104 or the negative electrode terminal 105 of the ten thin batteries 10 with the fixing device 5, the other thin batteries 10 are inverted with respect to one thin battery 10, as in the first embodiment. Thus, the lower surface of the other thin battery 10 is laminated so as to match the lower surface of the one thin battery 10.
[0056]
Then, the positive electrode terminal 104 of one thin battery 10 and the positive electrode terminal 104 of another thin battery 10 that is vertically inverted are positioned between the opposing damping members 53. Similarly, the negative electrode terminal 105 of one thin battery 10 and the negative electrode terminal 105 of another thin battery 10 inverted in the vertical direction are positioned between the opposing damping members 53. Then, the protruding member 52a of the engaging member 52 is rotated about the fulcrum 51b in the direction of the arrow in FIG. 7 until the barbed portion of the protruding member 52a of the engaging member 52 sufficiently penetrates the opening of the concave member. The convex member 52a is inserted into the concave member 52b. When the convex member 52a and the concave member 52b of the engaging member 52 are engaged, the positive terminal 104 and the negative terminal 105 of the thin battery 10 are sandwiched and fixed between the damping members 53 facing each other. By fixing the thin battery with the fixing device having the damping material having a spring constant smaller than the spring constant of the terminal, transmission of vibration to the thin battery can be reduced, and the failure rate of the thin battery can be reduced. Can be achieved.
[0057]
FIGS. 8A to 8C show an assembled battery 20 including ten thin batteries 10 connected by the fixing device of FIG. 7 described above. The assembled battery 20 includes ten thin batteries 10a to 10j, two fixing devices 5 'on the positive electrode side and the negative electrode side, assembled battery terminals 22, 23, an assembled battery cover 25, and an external elastic body 26. And has the same structure as the assembled battery according to the first embodiment except that the fixing device 5 'shown in FIG. 7 is used.
[0058]
The assembled battery 20 according to the second embodiment can form a composite assembled battery by stacking the assembled batteries 20 and connecting the terminals for each assembled battery as in the first embodiment of the present invention. In addition, the composite battery pack can be mounted on a vehicle.
[0059]
Third embodiment
9A and 9B are views showing a battery pack according to a third embodiment of the present invention, FIG. 9A is a perspective view of the battery pack, and FIG. 9B is a line III-III in FIG. FIG. The thin battery 10 constituting the battery pack according to the third embodiment of the present invention has the same structure as the thin battery described in the first embodiment.
[0060]
As shown in FIG. 9, the battery pack 20 according to the third embodiment of the present invention has a structure in which the battery pack cover 25 is fixed by the fixing bolts 24 a to fix the plurality of thin batteries 10. , A fixing battery 24, a battery pack cover 25, and a damping material 53.
[0061]
As shown in FIG. 9A, the spring constant of the positive electrode terminal 104 and the negative electrode terminal 105 of the thin battery 10 on the inner surface near the upper and lower long sides on the negative electrode terminal 105 side of the battery pack cover 25 at a predetermined pitch interval. Twelve damping members 53 composed of a mechanical spring having a smaller spring constant, a rubber-based elastic body, an elastomer-based elastic body, and the like are arranged. The inner surface near the side is made of a mechanical spring, a rubber-based elastic body, an elastomer-based elastic body, or the like having a spring constant smaller than the spring constant of the positive terminal 104 and the negative terminal 105 of the thin battery 10 at a predetermined pitch interval. The plurality of damping members 53 are arranged. By fixing the thin battery with a damping material having a spring constant smaller than the spring constant of the terminal, transmission of vibration to the thin battery can be reduced, and the failure rate of the thin battery can be reduced. It becomes possible.
[0062]
As shown in FIG. 9B, similarly to the first embodiment, two thin batteries are taken as one unit, and the positive electrode terminal 104 of one thin battery 10 and the positive terminal 104 of another thin battery 10 are used as a unit. The negative bus bar 21b is interposed between the negative terminal 105 of the one thin battery 10 and the negative terminal 105 of the other thin battery 10, and the one thin battery 10 is vertically inverted. It is stacked on another thin battery 10. Then, the positive electrode terminal 104 is fitted between the upper and lower damping materials 53 located on the positive electrode side, and the negative electrode terminal 105 is mounted on the upper and lower damping materials 53 located on the negative electrode side. Similarly, the positive electrode terminal 104 and the negative electrode terminal 105 of a total of twelve thin batteries 10 are arranged between the corresponding damping members 53 and mounted inside the assembled battery cover 25. Next, the fixing bolts 24a are inserted into the holes provided through the vicinity of each corner of the battery pack cover 25, and the corresponding upper and lower damping members 53 are tightened by tightening the fixing bolts 24a. The positive electrode terminal 104 and the negative electrode terminal 105 of each thin battery 10 are sandwiched and supported, and twelve thin batteries 10 are fixed to the assembled battery 20. When removing the thin battery 10 from the battery pack 20, the thin battery 10 can be easily removed by loosening the fixing bolt 24a.
[0063]
As described above, the structure in which the thin battery incorporated in the battery pack is easily taken out by disposing the damping material directly on the battery pack cover and fixing with the fixing bolts without specially providing the fixing device is provided. It becomes possible to make it cheap.
[0064]
Although not particularly shown, similarly to the first embodiment, the positive bus bar 21a may be connected to a positive battery terminal for connection to the outside of the battery assembly 20, and similarly, the negative bus bar 21b is , May be connected to the negative electrode terminal for the assembled battery. Further, when thin batteries are stacked as a composite battery to be described later, external elastic bodies may be attached to the four lower corners of the battery pack cover 25 in order to minimize vibration between the thin batteries.
[0065]
The assembled battery 20 according to the third embodiment can form a composite assembled battery by stacking the assembled batteries 20 and connecting the terminals for each assembled battery as in the first embodiment of the present invention. In addition, the composite battery pack can be mounted on a vehicle.
[0066]
Fourth embodiment
FIG. 10 is a perspective view of a battery pack according to a fourth embodiment of the present invention, and FIG. 11 is a cross-sectional view of the holder shown in FIG. The thin battery 10 constituting the battery pack according to the fourth embodiment of the present invention has the same structure as the thin battery described in the first embodiment.
[0067]
The battery pack 20 according to the fourth embodiment of the present invention is configured by stacking six holders 15 in units of holders 15 on which two thin batteries 10 can be mounted. It can be installed.
[0068]
The holder 15 is mainly configured by stacking four layers 151 to 154, and is stacked in the order of a first layer 151, a second layer 152, a third layer 153, and a fourth layer 154. It is configured.
[0069]
Each of the first to fourth layers 151 to 154 has a substantially rectangular flat plate shape having the same size and different thickness, and is provided at six places of each of four corners and a substantially central portion of an upper side and a lower side in the drawing. A through hole 155 through which the fixing bolt 24a passes is provided.
[0070]
The second layer 152 is formed on the surface facing the third layer 153 in such a shape that the outer periphery of the battery exterior members 106 and 107 excluding the terminals 104 and 105 of the thin battery 10 can be inserted. Further, a damping portion formed of a mechanical spring, a rubber-based elastic body, an elastomer-based elastic body, or the like having a spring constant smaller than that of the positive terminal 104 and the negative terminal 105 of the thin battery 10 is provided at a portion where the terminals 104 and 105 are in contact. A material 156 is attached, and a connection portion 156a such as a metal foil is attached to the surface of the damping material 53.
[0071]
The third layer 153 is formed by penetrating a shape into which the outer circumference including the terminals 104 and 105 of the thin battery 10 can be inserted. Further, the third layer 153 is provided with a spring 157 so that the space between the second layer 152 and the fourth layer 154 is sufficiently widened, so that the thin battery 10 can be taken out at the time of replacement. It will be easier.
[0072]
The fourth layer 154 is formed on the surface facing the third layer 153 in such a shape that the outer periphery of the battery exterior members 106 and 107 except for the terminals 104 and 105 of the thin battery 10 can be inserted. Further, a damping portion formed of a mechanical spring, a rubber-based elastic body, an elastomer-based elastic body, or the like having a spring constant smaller than that of the positive terminal 104 and the negative terminal 105 of the thin battery 10 is provided at a portion where the terminals 104 and 105 are in contact. A material 156 is attached, and a connection portion 156a such as a metal foil is attached to the surface of the damping material 53. Therefore, the fourth layer 154 has a mirror relationship with the second layer 152 described above.
[0073]
When the holder 15 is formed by laminating the first to fourth layers 151 to 154, a space having an insertion port 27 into which the two thin batteries 10 can be inserted is formed inside the holder 15. Six such holders 15 are stacked, and the fixing bolts 24a are respectively passed through the through holes 155 and temporarily fastened to the fixing nuts 24b, and the respective inserts formed on the upper surface of the holders 15 of the battery pack 20 are inserted. The thin battery 10 is inserted into the opening 27. When the insertion into all the insertion openings 27 is completed, the fixing bolts 24a are fully tightened, so that the damping material 156 of the second layer 152 and the damping material 156 of the fourth layer 154 of each holder 15 are connected to the terminal 104, The thin battery 10 is fixed to the assembled battery 20 with the battery 105 held therebetween. By fixing the thin battery with a damping material having a spring constant smaller than the spring constant of the terminal, transmission of vibration to the thin battery can be reduced, and the failure rate of the thin battery can be reduced. It becomes possible.
[0074]
As shown in FIG. 11, the two thin batteries 10 in the holder 15 are connected in series, and as shown in FIG. 10, the first layer 151 near the positive terminal and the negative terminal of the series connection, In the second layer 152 and the fourth layer 154, a conductive portion 158 such as a metal is provided so as to penetrate therethrough. A positive electrode terminal 22 for an assembled battery is attached to one first layer 151 that forms the outermost layer of the assembled battery 20. Then, the conduction portion 158 of each layer and the positive electrode terminal 22 for the assembled battery conduct, and the twelve thin batteries 10 incorporated in the assembled battery 20 are electrically connected. Similarly, a negative electrode terminal 23 for an assembled battery is attached to the other first layer 151 that forms the outermost layer of the assembled battery 20. Although not particularly shown, the conductive portion 158 of each of the above-described layers and the assembled battery The negative electrode terminal 23 is electrically connected, and the twelve thin batteries 10 are electrically connected. Therefore, the assembled battery 20 shown in FIG. 10 is configured by the thin batteries 10 connected in two series and six parallel. Note that the connection portion 156a of the damping material 156 that contacts the terminal and the conduction portion 158 of the third layer 153 are electrically connected.
[0075]
By forming the assembled battery by stacking the above-described holders, the thin battery incorporated in the assembled battery can be easily replaced.
[0076]
In addition, the number of thin batteries that can be mounted on the holder, the number of holders, and the connection method of the thin batteries constituting the assembled battery are not limited to the above-described number and connection method, but include required electric capacity, voltage, and the like. From, the number and connection method (series connection, parallel connection, series / parallel composite connection) can be appropriately set.
[0077]
The assembled battery 20 according to the fourth embodiment can form a composite assembled battery by stacking the assembled batteries 20 and connecting the terminals for each assembled battery as in the first embodiment of the present invention. In addition, the composite battery pack can be mounted on a vehicle.
[0078]
The number of thin batteries constituting the assembled battery, the number of assembled batteries constituting the combined battery, the connection method of the thin batteries constituting the assembled battery, and the number of assembled batteries constituting the combined battery in the embodiment described above. The connection method is not limited to the number and the connection method described above, and the number and the connection method (series connection, parallel connection, series-parallel composite connection) can be appropriately set based on required electric capacity, voltage, and the like. I can do it.
[0079]
The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.
[0080]
【Example】
Hereinafter, the effects of the present invention were confirmed by Examples and Comparative Examples that further embody the present invention. The following examples are for confirming the effects of the thin battery used in the above-described embodiment.
[0081]
Example 1
The battery pack of Example 1 has a battery exterior member made of a polypropylene (PP) resin film for the first resin layer, an aluminum (Al) foil for the metal layer, a nylon resin film for the second resin layer, and aluminum (Al) for the positive electrode terminal. ) Foil, nickel (Ni) foil on the negative electrode terminal, lithium manganate (LiMnO) on the positive electrode active material₂), Using a crystalline carbon material as the negative electrode active material and a mixed solution of propylene carbonate (PC) and ethyl methyl carbonate (EMC) as the electrolytic solution, to produce a thin battery of 140 mm long × 80 mm wide × 5 mm thick. Using ten thin batteries, the battery was fixed to the assembled battery by the fixing device shown in FIG. The size of the battery pack was 250 mm in length × 500 mm in width × 20 mm in height, and synthetic rubber mainly composed of butyl rubber was used as a damping material of the fixing device. In addition, the contact area of the positive electrode terminal and the negative electrode terminal with the damping material was set to 90%.
[0082]
The vibration transmissibility of this assembled battery was measured. For the measurement of the vibration transmissibility, an acceleration pickup was set substantially at the center of the upper part of the battery pack, and the acceleration of the response vibration obtained when forced vibration was measured.
[0083]
FIG. 12 is a graph showing the vibration transmissibility of the battery pack according to the first embodiment of the present invention. As shown in FIG. 12, while the resonance frequency is located at about 100 Hz or less in Comparative Example 1 described below, it was confirmed that the main resonance frequency of the assembled battery in Example 1 was shifted to about 100 Hz or more. did.
[0084]
Example 2
The assembled battery of Example 2 was manufactured using ten thin batteries similar to those of Example 1 and fixed to the assembled battery by the fixing device shown in FIG. The size of the battery pack was 250 mm in length × 500 mm in width × 20 mm in height, and synthetic rubber mainly composed of butyl rubber was used as a damping material of the fixing device. In addition, the contact area of the positive electrode terminal and the negative electrode terminal with the damping material was 70%.
[0085]
For this assembled battery, the same measurement of the vibration transmissibility as in Example 1 was performed. FIG. 13 is a graph showing the vibration transmissibility of the battery pack according to the second embodiment of the present invention. As shown in FIG. 13, in Comparative Example 2 described below, the resonance frequency is located at about 100 Hz or less, whereas in the assembled battery in Example 2, the main resonance frequency is shifted to about 100 Hz or more. did.
[0086]
Example 3
As the assembled battery of Example 3, 12 thin batteries similar to those of Example 1 were used, and the assembled battery shown in FIG. 9 was manufactured in two parallel and six series. The size of the battery pack was 250 mm in length × 600 mm in width × 20 mm in height, and synthetic rubber mainly composed of butyl rubber was used as a damping material for the fixing device. In addition, the contact area of the positive electrode terminal and the negative electrode terminal with the damping material was set to 90%.
[0087]
For this assembled battery, the same measurement of the vibration transmissibility as in Example 1 was performed. FIG. 14 is a graph showing the vibration transmissibility of the battery pack according to the third embodiment of the present invention. As shown in FIG. 14, it was confirmed that the resonance frequency was located at about 100 Hz or less in Comparative Example 3 described below, whereas the main resonance frequency of the battery pack in Example 3 was shifted to about 100 Hz or more. did.
[0088]
Example 4
The battery pack of Example 4 was manufactured by using 24 thin batteries similar to those of Example 1 and forming the battery pack shown in FIG. 10 in four parallels and six series. The size of the battery pack was 250 mm long × 450 mm wide × 50 mm long, and a synthetic rubber containing butyl rubber as a main component was used as a damping material for the fixing device. In addition, the contact area of the positive electrode terminal and the negative electrode terminal with the damping material was set to 90%.
[0089]
For this assembled battery, the same measurement of the vibration transmissibility as in Example 1 was performed. As a result, although not particularly shown, it was confirmed that the main resonance frequency was about 100 Hz or more as in Examples 1 to 3.
Comparative Example 1
As the battery pack of Comparative Example 1, a battery pack similar to that of Example 1 was manufactured using a thin battery similar to that of Example 1. However, the fixing device was not used for fixing the thin battery, and the positive terminal and the negative terminal of the thin battery and the bus bar were directly fixed by rivets.
[0090]
Comparative Example 2
As the battery pack of Comparative Example 2, a battery pack similar to that of Example 2 was manufactured using a thin battery similar to that of Example 2. However, the fixing device was not used for fixing the thin battery, and the positive terminal and the negative terminal of the thin battery and the bus bar were directly fixed by rivets.
[0091]
Comparative Example 3
As the battery pack of Comparative Example 3, a battery pack similar to that of Example 3 was manufactured using a thin battery similar to that of Example 3. However, the damping material was not used for fixing the thin battery, and the positive terminal and the negative terminal of the thin battery and the bus bar were directly fixed by rivets.
Consideration
[0092]
In the assembled batteries in Examples 1 to 4, it was confirmed that the resonance frequency was located at about 100 Hz or more. Thus, by avoiding the resonance of about 100 Hz or less, it has been clarified that the assembled battery can be effectively used even in an application such as a vehicle where vibration is relatively large.
[Brief description of the drawings]
FIG. 1A is a plan view showing the entire thin battery according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line II-II in FIG. 1A. It is.
FIG. 2A is a plan view of a fixing device according to the first embodiment of the present invention, and FIG. 2B is a partial side view of the fixing device before fixing a thin battery; (C) is a partial side view of the fixing device after fixing the thin battery.
3A and 3B are diagrams showing a battery pack according to the first embodiment of the present invention, wherein FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a side view.
FIG. 4 is a perspective view of a composite battery pack including the battery pack of FIG. 3;
5 (A) is a plan view of the composite battery pack of FIG. 3, FIG. 4 (B) is a front view of the composite battery pack of FIG. 3, and FIG. 4 (C) is a side view of the composite battery pack of FIG. FIG.
FIG. 6 is a schematic view showing the composite battery pack according to the first embodiment of the present invention mounted on a vehicle.
FIG. 7 is a schematic plan view of a fixing device according to a second embodiment of the present invention.
FIG. 8 is a view showing a battery pack according to a second embodiment of the present invention, wherein FIG. 8 (A) is a schematic plan view, FIG. 8 (B) is a front view, and FIG. 8 (C) is a side view. .
FIG. 9 is a view showing an assembled battery according to a third embodiment of the present invention, FIG. 9 (A) is a perspective view of the assembled battery, and FIG. 9 (B) is III-III in FIG. 9 (A). It is sectional drawing which follows a line.
FIG. 10 is a perspective view of a battery pack according to a fourth embodiment of the present invention.
FIG. 11 is a sectional view of the holder shown in FIG. 10;
FIG. 12 is a graph showing the results of measuring the vibration transmissibility of Example 1.
FIG. 13 is a graph showing the results of measuring the vibration transmissibility of Example 2.
FIG. 14 is a graph showing a result of a vibration transmission rate measurement of Example 3.
[Explanation of symbols]
1 ... Vehicle
5, 5 ': fixing device
51: Fixed base part
51a ... axis
51b ... fulcrum
51c, 51d ... members
52 ... engaging member
52a ... convex member
52b ... recess material
53 ... Damping material
53a ... connection part
54 ... Opening
55 ... Lead wire
10. Thin battery
10a to 10j: first to tenth thin batteries
101 ... Positive electrode plate
102 ... Separator
103 ... Negative electrode plate
104 ... Positive terminal
105 ... negative electrode terminal
106: Upper battery exterior member
107: Lower battery exterior member
109 ... power generation element
110: heat fusion area
15 ... Holder
151: first layer
152: second layer
153: Third layer
154: fourth layer
155 ... through-hole
156 ... Damping material
157 ... Spring
158 ... conductive part
20… Battery pack
21a ... Positive side busbar
21b: negative electrode side bus bar
22 ... Positive electrode terminal for assembled battery
23 ... Negative electrode terminal for assembled battery
24a ... fixing bolt
24b ... fixing nut
25 ... Battery cover
26 ... External elastic body
27 ... Insert
30 ... Composite battery
31 ... Positive terminal for external connection
32 ... Negative terminal for external connection
33 ... Insulation cover
34 ... Connecting member
35 ... fixing screw

Claims (20)

The outer peripheral edges of two sheet-shaped sealing means having a synthetic resin layer are joined to seal a power generating element inside the sealing means, and the positive terminal and the negative terminal connected to the power generating element are connected to each other. An assembled battery including a plurality of thin batteries derived from an outer peripheral portion,
An assembled battery having fixing means capable of fixing and opening the positive terminal or the negative terminal of the thin battery. The fixing means has a damping material at a position in contact with the positive terminal and the negative terminal of the thin battery,
The battery pack according to claim 1, wherein the thin battery is supported by sandwiching a positive electrode terminal or a negative electrode terminal of the thin battery with the damping material. 3. The battery pack according to claim 2, wherein the damping material is in contact with an area of 50% or more of a portion of the positive electrode terminal and the negative electrode terminal of the thin battery derived from the sheet-shaped sealing means. The assembled battery according to claim 2, wherein the damping material has a spring constant smaller than a spring constant of a positive terminal and a negative terminal of the thin battery. The assembled battery according to any one of claims 2 to 4, wherein the damping material includes a material selected from a spring, a rubber, and an elastomer. The assembled battery according to claim 1, wherein the fixing unit is capable of simultaneously fixing and opening the positive electrode terminal or the negative electrode terminal of the plurality of thin batteries. The assembled battery is stacked so that one of the positive electrode terminal or the negative electrode terminal of one thin battery and one of the positive electrode terminal or the negative electrode terminal of the other thin battery are in the same direction. Including two or more thin batteries,
7. The assembled battery according to claim 6, wherein the fixing means can simultaneously fix and open the positive electrode terminal or the negative electrode terminal of the stacked two or more thin batteries. The fixing means is juxtaposed such that one of the positive electrode terminal or the negative electrode terminal of one thin battery and one of the positive electrode terminal or the negative electrode terminal of the other thin battery are in the same direction. Including two or more thin batteries,
8. The battery pack according to claim 6, wherein the fixing means can simultaneously fix and open the positive electrode terminal or the negative electrode terminal of the two or more thin batteries arranged side by side. 9. The fixing device according to claim 6, wherein the fixing unit includes a connecting unit that electrically connects a positive terminal or a negative terminal of the one thin battery and a positive terminal or a negative terminal of the other thin battery. 9. Battery pack. The assembled battery according to any one of claims 1 to 9, wherein the synthetic resin layer of the thin battery includes a material selected from the group consisting of polypropylene, modified polypropylene, polyethylene, modified polyethylene, and ionomer. The thin battery according to any one of claims 1 to 10, wherein the positive electrode terminal of the thin battery includes one or more components selected from the group consisting of aluminum, iron, and nickel. The thin battery according to any one of claims 1 to 11, wherein the negative electrode terminal of the thin battery includes one or more components selected from the group consisting of iron, nickel, and copper. The thin battery according to any one of claims 1 to 12, wherein the thickness of the thin battery is 1 to 10 mm. The power generating element has a positive electrode active material that functions as a positive electrode,
14. The thin battery according to claim 1, wherein the positive electrode active material is a lithium composite oxide. The thin battery according to claim 14, wherein the lithium composite oxide is a lithium-manganese composite oxide. The power generation element has a negative electrode active material that functions as a negative electrode,
The thin battery according to claim 1, wherein the negative electrode active material is a carbon-based material. 17. The thin battery according to claim 16, wherein the carbon-based material is an amorphous carbon material. A composite battery pack having a plurality of battery packs, wherein the battery packs according to claim 1 are electrically connected,
Each of the assembled batteries has an assembled battery positive terminal and an assembled battery negative terminal that are electrically connected to the outside,
One of the assembled battery terminals of the assembled battery positive terminal or the assembled battery negative terminal, and the other assembled battery terminal of the one assembled battery terminal is a positive electrode. A composite battery pack including at least two or more of said battery packs electrically connected to different battery pack terminals. A composite battery pack having a plurality of battery packs, wherein the battery packs according to claim 1 are electrically connected,
Each of the assembled batteries has an assembled battery positive terminal and an assembled battery negative terminal that are electrically connected to the outside,
The battery pack positive electrode terminal of one of the battery packs is electrically connected to the battery pack negative electrode terminal of the other battery pack,
A composite battery pack including at least two or more of the battery packs, wherein the battery pack negative electrode terminal of the one battery pack and the battery pack negative electrode terminal of the other battery pack are electrically connected. A vehicle on which the composite battery pack according to claim 18 or 19 is mounted.

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