JP3818232B2 - Multilayer battery case - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a metal composite film such as a laminate sheet is used for the exterior of a power generation element in which a positive electrode plate and a negative electrode plate are laminated with a separator interposed therebetween, and a peripheral portion thereof is bonded and sealed by heat fusion or the like. The present invention relates to an outer case of a laminated battery.
[0002]
[Prior art]
In recent years, air pollution caused by exhaust gas from automobiles has become a global problem, and electric cars powered by electricity and hybrid cars that run in combination with an engine and a motor are attracting attention and will be installed in these. The development of high power batteries with high energy density and high power density occupies an important industrial position.
[0003]
As such a high output type battery, for example, there is a lithium ion battery, and there is a stacked type battery in which a flat positive electrode plate and a negative electrode plate are stacked with a separator interposed therebetween.
[0004]
In the above-mentioned laminated battery, both sides of the flat and rectangular power generating element are sandwiched between a pair of exterior materials formed of a polymer metal composite film such as a laminate sheet, and the peripheral portions thereof are joined by heat fusion. The electrolyte solution is sealed together with the power generation element.
[0005]
In this case, for example, as disclosed in Japanese Patent Application Laid-Open No. 2002-1003007, a concave portion for storing the power generation element is formed in one exterior material to form a cup shape, and the power generation element is stored in the cup-shaped concave portion together with the electrolyte. And after covering the opening part of the recessed part with the other planar-shaped exterior material, it is set as the exterior case sealed by heat-sealing each peripheral part.
[0006]
[Problems to be solved by the invention]
However, in a laminated battery using a metal composite film as an exterior case, the same (same thickness) material is used for each of the cup-shaped and planar exterior materials covering the power generation element from both sides.
[0007]
For this reason, the exterior material is used by limiting when heat-sealing the peripheral edge while avoiding the thermal effect on the power generation element, or by limiting the increase in internal pressure due to gas generated from the electrolyte during charging, etc. It was difficult to obtain the rigidity of the outer case by increasing the thickness of the outer casing.
[0008]
Therefore, when a battery pack is formed by stacking stacked battery units vertically, a reinforcing plate such as an aluminum plate is interposed between each battery unit to obtain the overall rigidity of the battery pack. Therefore, when the assembled battery is configured, the number of components increases, resulting in an increase in cost and weight.
[0009]
Therefore, the present invention has been made in view of such conventional problems, and an exterior case for a stacked battery that improves rigidity while retaining the function of relieving the internal pressure of the exterior material in which a recess for housing a power generation element is formed. Is to provide.
[0010]
[Means for Solving the Problems]
In order to achieve such an object, the outer case of the laminated battery of the present invention is a metal composite in which a power generation element in which a positive electrode plate and a negative electrode plate are laminated with a separator interposed therebetween, and a recess for housing the power generation element is formed. The cup-shaped packaging material is covered with a cup-shaped packaging material made of a film and a planar packaging material made of a metal composite film formed flat, and the power generation element is housed in the recess and filled with an electrolyte. And the above-described planar exterior material are heat-sealed and sealed at a portion corresponding to the peripheral edge of the cup-shaped exterior material, wherein the metal composite film has a metal layer as a base material. and then, the outer as the inner and opposite side the heat receiving-side of the metal layer is coated with a resin layer, the base material of the metal composite film formed with the planar outer package, the cup-shaped outer package The formed forms thicker than the substrate of the metal composite film, a heat insulating material, and sandwiched between the power generating element and the planar outer package.
[0011]
【The invention's effect】
With this configuration, in the outer case of the laminated battery of the present invention, the cup-shaped outer packaging material is formed by reducing the thickness of the base material of the cup-shaped outer packaging material in which the recess for housing the power generation element is formed. While ensuring flexibility and exhibiting a relaxation function against internal pressure, by increasing the thickness of the base material of the planar exterior material, the rigidity of the planar exterior material can be improved. In addition, since the heat insulating material is sandwiched between the power generation element and the planar exterior material, the heat transfer from the planar exterior material to the power generation element can be blocked by the thermal insulation material at the time of heat fusion, and the battery performance is improved. Deterioration can be prevented.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0013]
1 to 6 show a first embodiment of an exterior case of a multilayer battery according to the present invention, FIG. 1 is a plan view of the multilayer battery, FIG. 2 is a front view of the multilayer battery, and FIG. 3 is a multilayer battery. 4 is a sectional view taken along the line AA in FIG. 1, FIG. 5 is a sectional view taken along the line BB in FIG. 1, and FIG. 6 is an enlarged sectional view of a portion C in FIG. .
[0014]
The laminated battery 10 of the present embodiment includes a laminated electrode 11 as a power generation element, a first laminated sheet 12 as a cup-shaped exterior material made of a metal composite film in which a recessed portion 20 that houses the laminated electrode 11 is formed, It arrange | positions between the center parts with the 2nd laminate sheet 13 as a planar exterior material which consists of a metal composite film formed flat so that the opening part of the recessed part 20 may be covered, These 1st, 2nd laminates of a pair Sheets 12 and 13 cover both surfaces of laminated electrode 11 (in the front and back directions in FIG. 1).
[0015]
As shown in FIG. 6, the laminated electrode 11 is formed by sequentially laminating a plurality of positive plates 11A and negative plates 11B with a separator 11C interposed therebetween, and each positive plate 11A has a positive lead 11D as shown in FIG. Are connected to a positive electrode tab 14 as a positive electrode terminal, and each negative electrode plate 11B is connected to a negative electrode tab 15 via a negative electrode lead 11E.
[0016]
When the laminated battery 10 is assembled, the laminated electrode 11 is stored in the concave portion 20 of the first laminate sheet 12 and filled with the electrolytic solution, and then the concave portion 20 is covered with the second laminate sheet 13. The first and second laminate sheets 12 and 13 are sealed by heat-sealing a portion corresponding to the peripheral portion 12a of the first laminate sheet 12 (in this embodiment, the peripheral portion 13a of the second laminate sheet 13). Thus, the outer case 16 is configured.
[0017]
As shown in FIG. 4, the positive electrode tab 14 and the negative electrode tab 15 are drawn out from the joint portion 17 where the peripheral edge portions 12a and 13a of the first and second laminate sheets 12 and 13 are heat-sealed. In addition, a resin sheet (not shown) is wound around the portion disposed in the joint portion 17 of the positive electrode tab 14 and the negative electrode tab 15 to improve the weldability at the time of heat-sealing, and the sealing properties around the electrode tabs 14 and 15 are sealed. Has been made to ensure.
[0018]
As the laminated battery 10 having such a configuration, for example, there is a lithium ion secondary battery. In this case, as the positive electrode active material of the positive electrode forming the positive electrode plates 11A, 11A,... General formula LiNi1-xMxO2 (where 0.01 ≦ x ≦ 0.5, M is at least one of Fe, Co, Mn, Cu, Zn, Al, Sn, B, Ga, Cr, V, Ti, Mg, Ca, Sr) The compound which can be represented by this is contained.
[0019]
The positive electrode can also contain a positive electrode active material other than the lithium nickel composite oxide. Examples of the positive electrode active material other than the lithium nickel composite oxide include, for example, the general formula LiyMn2-zM'zO4 (where 0.9 ≦ y ≦ 1.2, 0.01 ≦ z ≦ 0.5, and M ′ is Fe, Co, Ni, Cu, Zn , Al, Sn, B, Ga, Cr, V, Ti, Mg, Ca, and Sr.).
[0020]
In addition, the general formula LiCo1-xMxO2 (where 0.01 ≦ x ≦ 0.5, M is Fe, Ni, Mn, Cu, Zn, Al, Sn, B, Ga, Cr, V, Ti, Mg, Ca, Sr At least one)).
[0021]
Lithium-nickel composite oxide, lithium-manganese composite oxide, lithium-cobalt composite oxide, etc. are mixed with carbonates such as lithium, nickel, manganese, cobalt, etc. according to the composition, and 600 [° C.] to 1000 in an oxygen-existing atmosphere. It can be obtained by firing in a temperature range of [° C.].
[0022]
In addition, the raw material of a positive electrode active material is not limited to carbonate, It can synthesize | combine similarly from a hydroxide, an oxide, nitrate, organic acid salt, etc. The average particle diameter of the positive electrode active material such as lithium nickel composite oxide or lithium manganese composite oxide is preferably 30 [μm] or less.
[0023]
As the negative electrode active material forming the negative electrode plate 11B, a specific surface area of 0.05 [m ² / g] or more, to use a range of 2 [m ² / g] or less. When the specific surface area of the negative electrode active material is in the range of 0.05 [m ² / g] to 2 [m ² / g], formation of the SEI layer on the negative electrode surface can be sufficiently suppressed.
[0024]
When the specific surface area of the negative electrode active material is less than 0.05 [m ² / g], the lithium can enter and leave the area so that the lithium doped in the negative electrode active material during charging is in the negative electrode active material during discharge. Therefore, it is not sufficiently dedoped, and the charge / discharge efficiency is lowered. On the other hand, when the specific surface area of the negative electrode active material exceeds 2 [m ² / g], it becomes difficult to control the formation of the SEI layer on the negative electrode surface.
[0025]
As a specific negative electrode active material, any material can be used as long as it is a material capable of doping and dedoping lithium with a lithium potential in the range of 2.0 [V] or less. Carbonized carbonaceous materials, artificial graphite, natural graphite, pyrolytic graphite, cokes such as pitch coke, needle coke, petroleum coke, graphite, glassy carbon, phenolic resin, furan resin, etc. at an appropriate temperature It is possible to use a carbonaceous material such as a fired organic polymer compound, carbon fiber, activated carbon, or carbon black.
[0026]
Metals capable of forming alloys with lithium and alloys thereof can also be used. Specifically, iron is doped with lithium at a relatively low potential such as iron oxide, ruthenium oxide, molybdenum oxide, tungsten oxide, and tin oxide. In addition to oxides to be dedoped, nitrides thereof, group 3B typical elements, elements such as Si and Sn, or, for example, MxSi, MxSn (where M represents one or more metal elements excluding Si or Sn. Si, Sn alloy, etc. represented by) can be used. Among these, it is particularly preferable to use Si or Si alloy.
[0027]
Furthermore, the electrolyte used for the electrolytic solution may be a so-called liquid electrolytic solution prepared by dissolving an electrolyte salt in a non-aqueous solvent, or a solution obtained by dissolving an electrolyte salt in a non-aqueous solvent in a polymer matrix. It may be a polymer gel electrolyte held in the container.
[0028]
When a polymer gel electrolyte is used as the nonaqueous electrolyte, examples of the polymer material to be used include polyvinylidene fluoride and polyacrylonitrile.
[0029]
As the non-aqueous solvent, any non-aqueous solvent used so far in this type of non-aqueous electrolyte secondary battery can be used, for example, propylene carbonate, ethylene carbonate, 1,2-dimethoxyethane, diethyl carbonate. Dimethyl carbonate, γ-butyrolactone, tetrahydrofuran, 1,3-dioxolane, 4-methyl-1,3-dioxolane, diethyl ether, sulfolane, methyl sulfolane, acetonitrile, propionitrile and the like. In addition, these non-aqueous solvents may be used alone or in combination of two or more.
[0030]
In particular, the non-aqueous solvent preferably contains an unsaturated carbonate, and specifically, preferably contains vinylene carbonate, ethylene ethylidene carbonate, ethylene isopropylidene carbonate, propylidene carbonate, and the like. Among these, it is most preferable to contain vinylene carbonate. By containing unsaturated carbonate as the non-aqueous solvent, it is considered that the effect due to the properties of the SEI layer generated in the negative electrode active material is obtained, and the overdischarge resistance is further improved.
[0031]
The unsaturated carbonate is preferably contained in the electrolyte in a proportion of 0.05% by weight or more and 5% by weight or less, and most preferably 0.5% by weight or more and 3% by weight or less. By setting the unsaturated carbonate content in the above range, a non-aqueous secondary battery having a high initial discharge capacity and a high energy density is obtained.
[0032]
The electrolyte salt is not particularly limited as long as it is a lithium salt exhibiting ionic conductivity.For example, LiClO4, LiAsF6, LiPF6, LiBF4, LiB (C6H5) 4, LiCl, LiBr, CH3SO3Li, CF3SO3Li, etc. can be used. is there. These electrolyte salts may be used alone or in a combination of two or more.
[0033]
In addition to such a configuration, in the laminated battery 10 of this embodiment, as shown in FIG. 6, the first laminate sheet 12 has an aluminum layer α1 as a metal layer as a base material, and the aluminum layer α1 is heat-sealed. A polymer resin layer β1 made of PE (polyethylene) or PP (polypropylene) or the like is coated on the inner side, and a nylon layer γ1 as a resin protective layer is adhered to the outer side of the aluminum layer α1. .
[0034]
Similarly, the second laminate sheet 13 has the aluminum layer α2 as a metal layer as a base material, the polymer layer β2 is coated on the inner side of the aluminum layer α2 on the heat fusion side, and A nylon layer γ2 is bonded to the outside of the aluminum layer α2.
[0035]
Here, the pair of first and second laminate sheets 12 and 13 uses a thick (thickness t1) aluminum plate for the aluminum layer α2 of the second laminate sheet 13 formed in a planar shape, A thin (thickness t2) aluminum foil is used for the aluminum layer α1 of the first laminate sheet 12 formed in a cup shape, and the former aluminum layer α2 is thicker than the latter aluminum layer α1 (t1> t2). is doing.
[0036]
At this time, the aluminum layer α2 using the aluminum plate has a thickness of about 5 to 10 times that of the aluminum layer α1 using the aluminum foil, and the thickness t1 of the thickened aluminum layer α2 is increased. Is preferably set to about 0.2 [mm] in order to give priority to rigidity while maintaining heat-fusibility. Incidentally, the thickness t2 of the thinned aluminum layer α1 is preferably set to 0.1 [mm] or less in order to give priority to flexibility.
[0037]
With the above configuration, in the outer case 16 of the multilayer battery 10 according to the first embodiment, the cup-shaped first laminate sheet 12 having the recess 20 for housing the multilayer electrode 11 has the aluminum layer α1. Is made of aluminum foil and its thickness t2 is thinned, so that the flexibility of the first laminate sheet 12 can be ensured.
[0038]
Therefore, the first laminate sheet 12 is an electrolytic solution sealed in the recess 20 in a state in which the mating planar second laminate sheet 13 and the peripheral edges 12a and 13a are heat-sealed and sealed. Even when gas is generated from the gas and the internal pressure in the recess 20 increases, the outer wall of the recess 20 can be deformed to relieve the pressure.
[0039]
On the other hand, since the planar second laminate sheet 13 has the aluminum layer α2 formed of an aluminum plate and the thickness t1 is increased, a predetermined rigidity is imparted to the second laminate sheet 13. As a result, the rigidity of the entire outer case 16 can be increased.
[0040]
Therefore, as shown in a third embodiment to be described later, when a stacked battery is configured by stacking stacked batteries 10 in the vertical direction, the rigidity between the stacked batteries 10 is ensured as in the prior art. It is no longer necessary to interpose the plate material, and the assembled battery can be simply configured while reducing the number of components, so that an inexpensive assembled battery can be provided.
[0041]
In addition, the first and second laminate sheets 12 and 13 constituting the outer case 16 of the present embodiment are provided with polymer resin layers β1 and β2 on the inner side of the aluminum layers α1 and α2 serving as base materials on the heat-sealing side. Thus, when the polymer resin layers β1 and β2 are heat-sealed, the first and second laminate sheets 12 and 13 can have high binding properties, and both positive and negative electrodes can be obtained. In the arrangement part of the tabs 14 and 15, welding with these positive and negative electrode tabs 14 and 15 and welding with the resin sheet surrounding these positive and negative electrode tabs 14 and 15 can be performed reliably.
[0042]
Further, since the nylon layers γ1 and γ2 are bonded to the outside of the aluminum layers α1 and α2, the nylon layers γ1 and γ2 are prevented from being damaged, thereby preventing deterioration of battery performance. be able to.
[0043]
7 to 11 show a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted.
[0044]
7 is a perspective view illustrating one example of a stacked battery, FIG. 8 is a perspective view illustrating another example of the stacked battery, FIG. 9 is a perspective view of a stacked battery stacked vertically, and FIG. FIG. 11 is a cross-sectional front view of the battery pack, and FIG.
[0045]
The laminated battery 10a shown in FIG. 7 and the laminated battery 10a ′ shown in FIG. 8 of the second embodiment are provided in plural (two in this embodiment) on the second laminate sheet 13 as one planar outer packaging material. The first laminate sheets 12 as cup-shaped exterior materials are arranged side by side, and the laminated electrodes 11 shown in the first embodiment are accommodated in the recesses 20 of the first laminate sheets 12.
[0046]
Of course, the concave portion 20 of the first laminate sheet 12 is filled with the electrolytic solution together with the storage of the laminated electrode 11 as in the first embodiment, and thereafter, each concave portion 20 is covered with the second laminate sheet 13, The first laminate sheet 12 and the second laminate sheet 13 are heat-sealed at a portion corresponding to the peripheral edge portion 12a of the first laminate sheet 12 and sealed.
[0047]
At this time, in the laminated battery 10a shown in FIG. 7, the positive electrode tab 14 drawn out from the joint portion 17 of the first laminate sheet 12 and the second laminate sheet 13 is aligned in the same direction with respect to the second laminate sheet 13. The negative electrode tabs 15 are aligned on the opposite side.
[0048]
On the other hand, in the stacked battery 10 a ′ shown in FIG. 8, one positive electrode tab 14 and the other negative electrode tab 15 that are arranged side by side are arranged in the same direction with respect to the second laminate sheet 13.
[0049]
Thus, the stacked batteries 10a and 10a ′ can be appropriately selected and configured according to the target voltage and electric capacity.
[0050]
Further, the first and second laminate sheets 12 and 13 are composed of an aluminum layer, a polymer resin layer, and a nylon layer, which are base materials as in the first embodiment, and the base material of the second laminate sheet 13 The aluminum layer is formed thicker than the aluminum layer serving as the base material of the first laminate sheet 12.
[0051]
Therefore, the laminated battery 10a, 10a 'of the second embodiment has the same function as the laminated battery 10 of the first embodiment, and further, one laminated sheet 13 can be used. By heat-sealing the plurality of first laminate sheets 12, it is possible to arrange a plurality of single cells on the basis of one second laminate sheet 13 as a base.
[0052]
For this reason, by providing a plurality of stacked batteries 10a and 10a 'and stacking each of them in the vertical direction as shown in FIG. 9, depending on the arrangement direction of the positive electrode tab 14 and the negative electrode tab 15, a high voltage or large It can be configured to output electrical capacitance.
[0053]
In the configuration shown in FIG. 9, the stacked batteries 10 a shown in FIG. 7 are arranged in the reverse direction with respect to each other vertically adjacent to each other, that is, the positive electrode tabs 14 and the negative electrode tabs 15 are alternately arranged up and down. However, the present invention is not limited to this, and it goes without saying that the stacked battery 10a 'shown in FIG. 8 can be stacked vertically. Of course, even when this stacked battery 10a 'is stacked, it can be reversed upside down.
[0054]
FIG. 10 shows a battery pack 30 in which the stacked battery 10a ′ shown in FIG. 8 is stacked in three upper and lower stages. In this case, the stacked battery 10a ′ stacked in three stages is connected to a battery case 31 and a lid. The body 31a is housed in a housing 32 having a sealed structure, and the four corners of the second laminate sheet 13 of each stacked battery 10a 'are coupled to the bottom surface of the battery case 31 via bolts 37 and the like.
[0055]
The positive electrode tab 14 and the negative electrode tab 15 between the upper and lower stacked batteries 10 a ′ are connected in series via the U-shaped conductor 33, and the positive electrode tab 14 not connected by the lowermost conductor 33 Terminals 35 and 36 are connected to the positive electrode tab 14 and the negative electrode tab 15 which are connected to the negative electrode tab 15 by a flat conductor 34 and are not connected by the uppermost conductor 33, respectively. 36 are drawn out of the housing 32.
[0056]
Therefore, in this assembled battery 30, all the stacked stacked batteries 10a 'can be connected in series to output a large current.
[0057]
Of course, the laminated battery 10a shown in FIG. 7 may be laminated to form the assembled battery 30, and each laminated battery 10a may be used regardless of which laminated battery 10a, 10a 'is used. The batteries arranged in parallel at 10a 'may be connected in parallel without being limited to the series connection, and a connection using both the series connection and the parallel connection may be used.
[0058]
FIGS. 12 and 13 show a third embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted.
[0059]
FIG. 12 is a cross-sectional front view of the stacked battery, and FIG. 13 is a cross-sectional side view of the stacked battery.
[0060]
As shown in FIGS. 12 and 13, the laminated battery 10 b according to the third embodiment is formed by heat-sealing a cup-shaped first laminate sheet 12 having a recess 20 and a planar second laminate sheet 13. Sometimes, a heat insulating material 40 as a thermal influence suppressing means for suppressing a temperature rise of the laminated electrode 11 is provided so as to be interposed between the laminated electrode 11 and the second laminate sheet 13.
[0061]
As the heat insulating material 40, it has insulating properties because it is in direct contact with the laminated electrode 11. For example, a ceramic thin plate, a non-woven fabric made of a resin such as PP and a high melting point, or a fibrous resin material may be used. it can.
[0062]
Of course, even in this embodiment, the aluminum layer α2 (FIG. 6) of the second laminate sheet 13 is formed thicker than the aluminum layer α1 (FIG. 6) of the first laminate sheet 12 as in the first embodiment. It is.
[0063]
Therefore, in the third embodiment, when the peripheral portions 12a and 13a of the first and second laminate sheets 12 and 13 are heat-sealed, the heat transfer efficiency is increased by the thickened aluminum layer α2. Since heat at the time of heat fusion transmitted to the laminated electrode 11 through the second laminate sheet 13 can be blocked by the heat insulating material 40, the second laminate sheet 13 is increased by thickening the aluminum layer α2. While the rigidity of the battery is increased, the thermal effect of the laminated electrode 11 can be suppressed and deterioration of the battery performance can be prevented.
[0064]
In the present embodiment, the case where the heat insulating layer 40 made of a ceramic thin plate, a non-woven fabric having a high melting point made of a resin such as PP, or a fibrous resin material is used as the thermal effect suppressing means has been described. The present invention is not limited to this. In short, as long as it suppresses the temperature rise of the laminated electrode 11 during the heat fusion of the first laminate sheet 12 and the second laminate sheet 13, A polymer resin layer β2 such as PP formed on the inner surface of the second laminate sheet 13 on the heat fusion side of the aluminum layer α2 may be used, and the polymer resin layer β2 may be formed thick. .
[0065]
14 and 15 show a fourth embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted.
[0066]
FIG. 14 is a perspective view for explaining a procedure for heat-sealing a flat outer packaging material to a cup-shaped outer packaging material using a local heating device as a heat influence control means, and FIG. 15 is an enlarged cross-sectional view of a main part of the local heating device. is there.
[0067]
As shown in FIG. 14, the laminated battery 10 c of the fourth embodiment uses a local heating device 50 to apply a heat-welded portion of the planar second laminate sheet 13 in which the aluminum layer α2 is thickened ( In this embodiment, the peripheral edge portion 13a) is preheated, and immediately after the preheat is completed, the second laminate sheet 13 is immediately superposed on the first laminate sheet 12, heated, and heat-sealed.
[0068]
As shown in FIG. 15, the local heating device 50 corresponds to the laminated electrode 11 and the heating unit 51 using electromagnetic induction disposed in the heat-sealed construction part (peripheral part 13 a) of the second laminate sheet 13. And a cooling unit 52 disposed in a portion (that is, a central portion of the second laminate sheet 13 facing the concave portion 20 of the first laminate sheet 12 in the laminated battery 10c shown in FIG. 14).
[0069]
Of course, the concave portion 20 of the first laminate sheet 12 during the main heating is in a state in which the laminated electrode 11 is accommodated and filled with the electrolyte, and the second laminate sheet 13 is placed in the local heating device 50. When setting, the surface of the polymer resin layer β2 is brought into contact with the local heating device 50.
[0070]
In this embodiment, electromagnetic induction heating is used for the heating unit 51. However, other heating methods such as electric heating may be used, and the cooling unit 51 may be configured to circulate cooling water, for example. .
[0071]
Accordingly, in this embodiment, only the peripheral edge portion 13a of the second laminate sheet 13 can be preheated by the local heating device 50, so that the aluminum layer α2 of the second laminate sheet 13 is thickened. Even in this case, heat fusion with the first laminate sheet 12 can be performed without affecting the laminated electrode 11 during the main heating, and deterioration of battery performance can be more effectively prevented.
[0072]
In the present embodiment, the case where the local heating device 50 is configured to include the heating unit 51 and the cooling unit 52 has been described. However, the present invention is not limited thereto, and for example, the cooling unit 52 is provided. Alternatively, the heating unit 51 may perform electromagnetic induction heating. In this case, since the heating part 51 performs electromagnetic induction heating, only the desired heat fusion application part (the peripheral part 13a of the second laminate sheet 13) can be locally heated, and the local heating device 50 is cooled. It is possible to configure without providing the portion 52.
[0073]
Further, the main heating of the first and second laminate sheets 12 and 13 can be performed with the second laminate sheet 13 set in the local heating device 50. In this case, the second laminate sheet 13 is placed on the front and back sides. On the contrary, the local heating device 50 is set, and the local heating device 50 is turned upside down so that the second laminate sheet 13 is placed on the first laminate sheet 12 for main heating.
[0074]
Further, the laminated battery 10c to be assembled through the preheating process by the local heating device 50 is also applicable to the laminated batteries 10, 10a, 10a ′, 10b shown in the first to third embodiments. Can do.
[0075]
By the way, although the exterior case of the multilayer battery of the present invention has been described by taking the first to fourth embodiments as examples, various embodiments are adopted without departing from the gist of the present invention without being limited thereto. For example, although a lithium ion secondary battery is shown as a stacked battery, the present invention can be applied to other batteries having the same configuration without being limited thereto.
[Brief description of the drawings]
FIG. 1 is a plan view of a stacked battery according to a first embodiment of the present invention.
FIG. 2 is a front view of the laminated battery in the first embodiment of the present invention.
FIG. 3 is a side view of the laminated battery in the first embodiment of the present invention.
4 is a cross-sectional view taken along line AA in FIG. 1. FIG.
5 is a cross-sectional view taken along line BB in FIG. 1. FIG.
6 is an enlarged cross-sectional view of a portion C in FIG.
FIG. 7 is a perspective view showing one example of a stacked battery according to a second embodiment of the present invention.
FIG. 8 is a perspective view showing another example of the stacked battery in the second embodiment of the present invention.
FIG. 9 is a perspective view of a stacked battery according to a second embodiment of the present invention stacked up and down.
FIG. 10 is a cross-sectional front view of an assembled battery in a second embodiment of the present invention.
FIG. 11 is a cross-sectional side view of an assembled battery in a second embodiment of the present invention.
FIG. 12 is a cross-sectional front view of a stacked battery according to a third embodiment of the present invention.
FIG. 13 is a cross-sectional side view of a stacked battery in a third embodiment of the present invention.
FIG. 14 is a process explanatory diagram showing a procedure for heat-sealing a planar exterior material to a cup-shaped exterior material using a local heating device according to a fourth embodiment of the present invention.
FIG. 15 is an enlarged sectional view of a main part of a local heating device according to a fourth embodiment of the present invention.
[Explanation of symbols]
10, 10a, 10a ′, 10b, 10c Multilayer battery 11 Multilayer electrode (power generation element)
11A Positive electrode plate 11B Negative electrode 11C Separator 12 First laminate sheet (cup-shaped exterior material)
13 Second laminate sheet (planar exterior material)
16 Outer case 20 Concave portion 30 Battery pack 40 Heat insulating material (thermal influence suppressing means)
50 Local heating device (heat influence suppression means)
51 Heating part 52 Cooling part

Claims (3)

Both sides of the power generation element in which a positive electrode plate and a negative electrode plate are laminated with a separator interposed therebetween,
A cup-shaped exterior material made of a metal composite film having a recess for accommodating the power generation element;
Covered with a flat exterior made of a metal composite film formed flat,
The cup-shaped exterior material and the planar exterior material are heat-sealed at a portion corresponding to the peripheral edge portion of the cup-shaped exterior material in a state where the power generation element is accommodated in the recess and the electrolytic solution is filled. An outer case of a laminated battery sealed with
The metal composite film has a metal layer as a base material, and coats the inner side of the metal layer which is the heat fusion side and the outer side which is the opposite side with a resin layer,
The base material of the metal composite film in which the planar exterior material is formed is formed thicker than the base material of the metal composite film in which the cup-shaped exterior material is formed ,
An exterior case for a stacked battery, wherein a heat insulating material is sandwiched between the power generation element and the planar exterior material . The exterior case of the laminated battery according to claim 1, wherein a plurality of the cup-shaped exterior materials are arranged side by side on the one planar exterior material, and the power generation element is accommodated in each cup-shaped exterior material. . A polymer resin layer is coated on the inner side of the metal layer on the heat fusion side, and a resin protective layer is adhered to the outer side of the metal layer.
The exterior case of the laminated battery according to claim 1 or 2,

Images