KR20160123246A - Battery pack - Google Patents

Abstract

An exterior body (32) of a laminated power storage module (2) has an emboss unit (45) in at least one direction of a first exterior material (10) and a second exterior material (20) facing each other, and a plurality of electrode element chambers (42) which have become convex units by heat sealing around the emboss unit (45). A battery pack (5) is formed by stacking and connecting a plurality of the modules (2). A space (70) for heat radiation is formed by a difference in thickness between the electrode element chambers (42) and a heat sealing unit (52a, 52b). Also, a battery element (60) conducts electricity to an exposure unit (14, 24) on the inside of metal foil in the battery element chambers (42). A gap between the modules (2) is connected in an exposure unit (16, 26) on the outside of the metal foil.

Description

Batteries {BATTERY PACK}

TECHNICAL FIELD The present invention relates to a battery assembly (battery assembly) which is made lighter, higher in heat release (higher heat radiation), and saved in space.

In this specification, the term " aluminum " is used in the sense of including Al and Al alloys, and the term " copper " is used to mean Cu and Cu alloys. , Ni and Ni alloys, and the term " titanium " is used to mean Ti and Ti alloys. In this specification, the term " metal " is used to mean a single metal and an alloy.

Lithium ion secondary batteries or lithium polymer secondary batteries used in batteries for hybrid cars, electric vehicles, stationary batteries for domestic or industrial use, in place of conventional metal sheathing in conjunction with miniaturization and weight reduction, Laminate facing materials that hold film together are increasingly being used. It is also considered that an electric double layer capacitor or a lithium ion capacitor using a laminate outer material is mounted on an automobile or a bus.

In a device requiring high energy, such as an electric car, a power storage module is laminated and connected in series in order to obtain a large electric energy with a small capacity. However, when the battery is charged and discharged, heat due to the internal resistance of the module accumulates Since the temperature of the module is high, the deterioration of the cell deteriorates and the performance of the module deteriorates. For this reason, in a battery module in which a plurality of power storage modules are stacked, it has been proposed to cool modules by interposing a heat dissipating member between power storage modules (see Patent Documents 1 and 2).

The rechargeable battery disclosed in Patent Document 1 is provided with a flow space for cold air through a corrugated member (wave member) as a heat radiation member between power storage modules to obtain a heat radiating effect. Further, the coin cell described in Patent Document 2 has a structure in which a tube member for circulating a cooling liquid is disposed between the power storage modules, and a plate spring is interposed between the tube member and the power storage module ) To form a space for air cooling, whereby a high cooling effect is obtained by both liquid cooling and air cooling.

Japanese Patent Laid-Open Publication No. 2012-84551 Japanese Patent Application Laid-Open No. 2014-170697

However, in the cooling methods described in Patent Documents 1 and 2, a bulky heat radiation member such as a corrugated material, a tube member, and a leaf spring is required, and further, a cooling device for supplying cold air or a cooling liquid is required. It occupies a large space. Therefore, it is difficult to miniaturize the battery module even if the power storage module is miniaturized. Further, since the power storage module is connected to the electrode using the tab lead, there is a possibility that the heat generation at the connection portion of the tab lead and the sealing property of the sealed portion may be lowered.

SUMMARY OF THE INVENTION The present invention has been made in view of the technical background, and an object of the present invention is to provide a battery module in which the heat dissipation performance is increased without increasing the size, and the risk of liquid leakage is greatly reduced.

In order to achieve the above object, the present invention has the following configuration.

[1] A laminated type power storage module,

Wherein the first metal foil layer is laminated on one surface of the first metal foil and the first thermoplastic resin layer is laminated on the other surface thereof and the first metal foil inner exposed portion on the side of the first thermoplastic resin layer surface on which the first metal foil is exposed And a second heat-resistant resin layer is laminated on one surface of the second metal foil and a second thermoplastic resin layer is laminated on the other surface, and a second metal foil is laminated on the surface of the second thermoplastic resin layer, And a battery element having a positive electrode, a negative electrode and a separator disposed between the positive electrode and the negative electrode,

At least one of the first exterior material and the second exterior material has an embossed portion in an area including the first metal foil inner side exposed portion and the second metal foil inner side exposed portion and the first thermoplastic resin layer of the first exterior material and the second exterior material The first thermoplastic resin layer and the second thermoplastic resin layer are surrounded by the heat-sealed portion where the second thermoplastic resin layer faces and the first thermoplastic resin layer and the second thermoplastic resin layer are fused together to form the first metal foil inner exposed portion and the second metal foil inner exposed portion ( And a plurality of battery element compartments (battery element compartments) convexed by the embossed portion are formed on the outer surface of the casing, a first metal foil exposed portion exposed on the outer surface of the casing, A second metal foil outer exposed portion to which the second metal foil is exposed,

Wherein the battery element enclosed in the battery element chamber together with the electrolyte has a positive electrode electrically connected to the first metal foil inner exposed portion and a negative electrode electrically connected to the second metal foil inner exposed portion,

A plurality of the lamination type power storage modules are stacked in a manner that a space is formed on the heat sealing portion and the adjacent lamination type power storage module in the stacking direction is connected to the first metal foil outside exposed portion and the second metal foil outside exposed portion As a battery.

[2] A battery module according to the preceding item (1), wherein a plurality of laminate type power storage modules are stacked so that the battery element chamber and the heat sealing portion are overlapped with each other in the stacking direction of the laminate type power storage module.

[3] A battery module according to item 1 or 2, wherein a heat transfer body is disposed between neighboring laminate type power storage modules in the stacking direction.

[4] The assembled battery according to item 1 or 2, wherein the space is a cooling gas passage.

[5] The battery module according to item 1, wherein the space and the battery element compartment are adjacent to each other only in a direction orthogonal to the stacking direction of the laminate-type power module.

[6] The battery module according to item 2, wherein the space and the battery element room are adjacent to each other in both the lamination direction of the laminate type power storage module and the direction orthogonal to the lamination direction.

Since the battery element room of the laminate-type power storage module is formed as a convex portion protruding outwardly of the exterior body, a space is formed on the heat-sealed portion by lamination of a plurality of modules. Heat generated from the battery element is radiated into the space, and gas is flowed into the space to promote heat radiation, thereby cooling the battery module. Since the space is formed without using the heat radiation member, the cooling effect can be obtained without increasing the size of the assembled battery. Further, since the surface area of the external body is increased by having a plurality of battery element compartments, the heat radiation efficiency of the individual modules is good.

Further, in the individual laminate type power storage module, a plurality of battery elements are electrically connected through the first metal foil and the second metal foil by the first metal foil inner exposed portion and the second inner exposed portion in the battery element chamber, and the laminate- The first metal foil outer exposed portion and the second metal foil outer exposed portion. Also, connection between the assembled battery and the external device is performed by the first metal foil outer exposed portion and the second metal foil outer exposed portion. That is, the laminated type power storage module and the coin cell do not have tab leads. Therefore, since the first thermoplastic resin layer and the second thermoplastic resin layer are fusion-bonded to each other at the portion of the heat-sealed portion that is in contact with the battery element chamber, the adhesion is high and the risk of liquid leakage is greatly reduced. In addition, by not using the tab lead, the heat sealing operation can be simplified, and the weight of the assembled battery can be reduced and the space can be saved.

The rechargeable battery according to [2] above is characterized in that the electrode element chamber is adjacent to the space in both the stacking direction of the module and the direction orthogonal to the stacking direction, and the battery element seal contacts the space with more area, .

The coagulant described in [3] above is arranged (heat-exhausted) in the heat transfer member, so that a high cooling effect can be obtained.

The coagulant described in [4] above is promoted to dissipate heat by flowing gas into the space.

The coils described in [5] above dissipate heat generated in the battery element compartment to a space adjacent to the direction perpendicular to the stacking direction of the laminate-type power storage modules.

Since the space and the battery element chamber are adjacent to each other in both the lamination direction of the laminate type power storage module and the direction orthogonal to the lamination direction of the laminate type power storage module described above, heat radiation is promoted.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1A is a perspective view of an embodiment of a laminate-type power storage module constituting a battery module according to the present invention; FIG.
1B is a sectional view taken along line 1B-1B in Fig. 1A.
2A is a perspective view of an embodiment of a battery module according to the present invention;
FIG. 2B is a sectional view taken along line 2B-2B in FIG. 2A.
3 is a sectional view of a bare cell;
4 is a cross-sectional view of another example of the electrode element seal in the laminate type power module.
5 is a sectional view of another example of the electrode element room in the laminate type power storage module.
6 is a sectional view of another embodiment of the assembled battery according to the present invention.
7A is a sectional view of still another embodiment of the assembled battery according to the present invention.
Figure 7b is a partial enlarged view of Figure 7a.
Figure 7c is a partial enlarged view of Figure 7a.

Figs. 1A and 1B show one embodiment of a laminate-type power module constituting the assembled battery of the present invention, and Figs. 2A and 2B show embodiments of a battery module using the laminate-type power module.

In the following description, the same reference numerals denote the same elements, and redundant description is omitted. In the case of the first facer and the second facer constituting the external body, the case in which the metallic foil is exposed regardless of the facer and the forming position is collectively referred to as " metallic foil exposed portion " The exposed portion is collectively referred to as the " metal foil inner exposed portion ", and the portion exposed to the outer surface of the outer body is collectively referred to as the " metal foil outside exposed portion ".

[Laminate type power storage module]

The external body 32 of the laminate-type power storage module 2 shown in Figs. 1A and 1B is constituted by the first casing member 10 and the second casing member 20 and has nine And a battery element chamber (42). Each battery element chamber 42 is filled with a battery element 60 and an electrolyte.

The first casing member 10 is a laminate member in which a first heat resistant resin layer 12 is laminated on one surface of a first metal foil 11 and a first thermoplastic resin layer 13 is laminated on the other surface thereof, Nine embossed portions 45 are formed in the shape of a square when viewed from above (plan view) in which the sheet is press-molded to become the battery element chamber 42. On the other hand, the second casing member 20 is a laminate member in which a second heat-resistant resin layer 22 is laminated on one surface of the second metal foil 21 and a second thermoplastic resin layer 23 is laminated on the other surface, It is a flat sheet without an embossed part. The exterior body 32 is formed in such a manner that the first thermoplastic resin layer 13 of the first exterior material 10 and the second thermoplastic resin layer 23 of the second exterior material 20 face each other, The first thermoplastic resin layer 13 and the second thermoplastic resin layer 23 are fused to form the heat sealing portions 52a and 52b so that the battery element 60 and the battery element chamber 42 Is formed. The battery element chamber 42 is formed as a convex portion protruding from the heat-sealed portions 52a and 52b to the outside of the exterior body by the height of the embossed portion 45, And thin at the heat-sealed portions 52a and 52b. A first metal foil inner exposed portion 14 in which a portion of the first thermoplastic resin layer 13 is removed to expose the first metal foil 11 is formed in the battery element chamber 42, A part of the resin layer 23 is removed and a second metal foil inner exposed portion 24 is formed in which the second metal foil 21 is exposed.

One side of the first casing member 10 is a first flange 15 which is directed from the heat-sealing portion 52a and whose both surfaces serve as the outer surface of the casing 32. The first flange 15, A metal foil outside exposed portion 16 is formed. On the other hand, on the opposite sides of the first flange 15, the second casing member 20 is directed from the heat-sealed portion 52a, and both surfaces become the second flange 25 which becomes the outer surface of the casing 32, The second metal foil outer exposed portion 26 to which the second metal foil 21 is exposed is formed. Three connection holes 17 and 27 are formed in the first metal foil outer exposed portion 16 of the first flange 15 and the second metal foil outer metal foil exposed portion 26 of the second flange 25, This is punctured.

3, the battery element 60 sealed with the electrolyte in the battery element chamber 42 is formed by laminating the positive electrode 61, the separator 62, the negative electrode 63 and the separator 62 , And a rolled type bare cell in which the laminate is formed in a roll shape. The positive electrode 61 is exposed as the uppermost layer of the battery element 60, and the negative electrode 63 is exposed as the lowermost layer. In the battery element chamber 42, the positive electrode 61 of the battery element 60 contacts the first metal foil inner exposed portion 14 of the first casing member 10 to be electrically conducted, 2 exposed to the second metal foil inner exposed portion 24 of the cover member 20 so as to be electrically conducted. The first metal foil 11 is exposed on the first metal foil outer exposed portion 16 of the outer surface of the outer casing 32 and the second metal foil 21 is exposed on the outer surface of the second metal foil outer exposed portion 16 of the outer casing 32. [ The battery element 60 can obtain electrical conduction with the outside through the first metal foil 10 and the second metal foil 20. [ That is, the first metal foil 11 is used as a positive electrode side conduction portion and the second metal foil 21 of the second casing member 20 is used as a negative electrode side conduction portion.

[Battery]

The assembled battery 5 shown in Figs. 2A and 2B is constituted such that the four lamination type power storage modules 2 are staggered so that the first flange 15 and the second flange 25 of the modules neighboring in the stacking direction overlap each other The battery element compartments 42 of the neighboring modules are stacked in an overlapping manner and are connected to each other. That is, the four laminate-type power storage modules 2 are stacked in such a manner that the second metal foil outer exposed portion 26 of the second flange 25 of the uppermost first module and the second flange 25 of the second flange 15 of the second- 1 metal foil outer exposed portion 16 is connected to the connection holes 27 and 17 by passing a connecting pin 35 made of a conductive material and similarly the second metal foil outer exposed portion 26 and the first metal foil outer exposed portion 16 of the third module are connected to the second metal foil outer exposed portion 26 of the third module and the first metal foil outer exposed portion 26 of the fourth module 16 are connected. The positive electrode pin 36 made of a conductive material is attached to the connection hole 17 of the first metal foil outer exposed portion 16 of the first module and the second metal foil outer exposed portion 26 of the fourth layer is attached. A negative electrode pin 37 made of an electrically conductive material is attached to the connection hole 27 of the battery case 30. The four laminate type power storage modules 2 are connected in series and the positive electrode pin 36 and the negative electrode pin 37 are used as the electrode terminals of the battery module 5 to connect the electric wires 938 And can connect to another device.

Since the thickness of the module is thick in the battery element chamber 42 and thin in the heat-sealed portions 52a and 52b, the laminate-type power storage module 2 in the laminate- A space 70 is formed. That is, a quadrangle of (the width of the heat-sealed portions 52a and 52b) × (the height of the embossed portion 45) is formed on the heat-sealed portions 52a and 52b around the battery element chamber 42, A space 70 is formed. Since all of the battery element compartments 42 are in contact with the space 70 in the direction perpendicular to the stacking direction since the heat-sealed portions 52a and 52b are always present around the battery element chamber 42,

The plurality of battery elements 60 are electrically connected to the first metal foil 11 and the second metal foil 11 by the first metal foil inner exposed portion 14 and the second inner exposed portion 24, 21 and the laminated power storage modules 2 can be connected to each other through the first metal foil outer exposed portion 16 and the second metal foil outer exposed portion 26. [ Connection between the assembled battery 5 and the external device is also performed by the first metal foil outer exposed portion 16 and the second metal foil outer exposed portion 26. [ That is, the laminated type power storage module 2 and the assembled battery 5 do not have tab leads. The first thermoplastic resin layer 13 and the second thermoplastic resin layer 23 are fusion-bonded to each other in the portion of the heat-sealed portions 52a and 52b contacting the battery element chamber 42, It is possible to obtain a sealing property that is higher than that of the battery element chamber 42 in which the tab leads are drawn out, and the risk of liquid leakage is reduced. Further, by not using the tab lead, the heat sealing operation can be simplified, and the weight of the assembled battery 5 can be reduced and space can be saved.

The battery pack 5 has a high capacity by connecting a plurality of laminate type power storage modules 2, but has a large amount of heat generated because it has a large number of battery elements 60. In the assembled battery 5, heat generated in the battery element 60 is dissipated into the space 70, and gas is flowed into the space 70, thereby promoting heat dissipation. The space 70 is a heat dissipating space formed by stacking the laminate-type power storage module 2, and it is possible to exhibit heat dissipation performance without using a heat dissipating member such as a corrugated member, Can be obtained. Cooling using the space 70 is unique to a structure in which a plurality of laminate type power storage modules 2 are laminated, and is not obtained in a single module. Further, when the battery capacity of the entire module is the same, a module having a plurality of battery elements and a plurality of battery element compartments for enclosing them is preferable to a module having one battery element and one battery element chamber for enclosing the same, The heat dissipation efficiency is good because the surface area is large.

The cooling effect is forcibly increased by the air blowing in the space 70, and is further increased by sending cool air. However, even if no forced air is blown, a natural convection occurs when a temperature difference is generated in the battery 5 due to heat generation, so that a corresponding cooling effect can be obtained.

In order to form a space in the assembled battery, it is a condition that the battery element chamber is formed by the embossed portion and has the convex portion on the outer surface of the external body. However, the shape of the embossed portion and the electrode element seal is not limited to the embodiment shown in Figs. 2A and 2B, but an embossed portion is formed on at least one of the first casing and the second casing constituting the casing The convex portion can be formed on the outer surface of the external body. It is a matter of course that the distance between the battery element compartments, that is, the width of the heat-sealed portion is set to a dimension that secures the hermeticity of the battery element seal. However, in order to expand the space for heat- It is free to enlarge.

4 and 5 show another embodiment of the embossed portion and the battery element seal. Although not shown in the drawings, the laminated structure of the first casing member 10 and the second casing member 20 and the internal structure of the battery element chamber are not shown, The metal foil inner side exposed portion is formed and the battery element 60 is sealed in the same manner as the laminate type power storage module 2.

4 includes both the first casing member 10 and the second casing member 20 having the embossed portions 45 and 46 and the embossed portions 45 and 46 of the first casing member 10 and the second casing member 20, And one electrode element chamber 81 is formed. 5 has both the first casing member 10 and the second casing member 20 as embossed portions 45 and 46 like the above-mentioned casing 80, The boss portions 45 and 46 form the electrode element chambers 83a and 83b opposite to the flat portion of the counterpart. Since the external bodies 80 and 82 have the embossed portions 45 and 46 on both sides in the thickness direction, when the modules having the external bodies 80 and 82 are laminated, spaces are formed on both sides of the module .

Further, the arrangement of the spaces can be changed by the lamination mode of the laminate type power storage module.

The battery module 6 shown in Fig. 6 is a laminated battery module in which the laminate type power storage module 2 is stacked one by one and the center of the battery element chamber 42 of one module 2 is adjacent The heat-sealing portions 52a and 52b of the module 2 are placed so as to overlap each other. The amount of displacement is one half of the distance between the battery element compartments 42. By displacing the position of the laminate-type power storage module 2 in this manner, the battery element chamber 42 is arranged in a zigzag shape in the stacking direction. The width of the first flange 15 and the width of the second flange 25 are changed because the positions of the connecting holes 17 and 27 of the neighboring module are shifted by shifting the laminate- Thereby aligning the connection holes 17 and 27 with each other. Therefore, the shape of the laminate-type power storage module 2 shown in Fig. 6 is not exactly the same as that of the laminate-type power storage module 2 shown in Figs. 1A and 2B in a strict sense, . The battery module 6 includes four laminate type power storage modules 2 connected in series by connecting pins 35 as in the case of the battery module 5, 36 and the anode pin 37 provided in the fourth layer module are used as the electrode terminals of the battery module 6. [

The space 71 is also formed in a zigzag shape in the laminating direction by the above lamination structure and a space 71 is formed immediately under and immediately below the battery element chamber 42 of the laminate- . The space 71 is the same size as the space 70 of the assembled battery 5 but is adjacent to the space 70 only in the direction in which the electrode element chamber 42 of the assembled battery 5 is perpendicular to the stacking direction The electrode element chamber 42 of the assembled battery 6 is adjacent to the space 71 in both the stacking direction and the direction orthogonal to the stacking direction. As described above, by making the battery element chamber 42 contact the space 71 with a larger area, the cooling efficiency can be increased.

As described above, in the assembled battery 6 in which the electrode element chamber 42 and the space 71 are arranged in a zigzag shape, the electrode element chamber 42 and the heat sealing portions 52a and 52b are arranged in a staggered manner, The size relationship of the dimensions is not regulated. When the electrode element chamber 42 and the heat sealing portions 52a and 52b have the same dimensions, spaces having the same dimensions as those of the electrode element chamber 42 are formed. When the electrode element chamber 42 is larger than the heat sealing portions 52a and 52b, a part of the electrode element chamber 42 is overlapped in the stacking direction, but a space is formed. Conversely, when the electrode element chamber 42 is smaller than the heat-sealed portions 52a and 52b, a part of the heat-sealed portions 52a and 52b are overlapped in the stacking direction, but the electrode- Since the heat sealing portions 52a and 52b are supported, the electrode element seal 42 of the upper layer is filled in the space, so that the space is not blocked. In either case, a space corresponding to the dimensions of the heat-sealed portions 52a and 52b is formed.

As another means for enhancing the cooling effect, there is a method of interposing the heat transfer body 75 between the laminate type power storage modules 2. In the assembled battery 6 shown in Fig. 6, the heat transfer member 75 is arranged on the metal plate with the metal plate interposed therebetween, thereby enhancing the cooling effect. The material of the heat transfer member 75 is preferably aluminum or copper having a high thermal conductivity, and a cooling device may be connected to the heat transfer member 75 to enhance the cooling effect.

[Other forms of laminate type power storage module and assembled battery]

The laminated type electrical storage module constituting the assembled battery is required to have a metal foil outer exposed portion on the outer surface of the external body, but the formation position thereof is not limited. The outer metal exposed portion is a portion for achieving conduction between the modules and conduction between the assembled battery and the outside, and conduction is possible at the outer metal foil exposed portion provided in addition to the flange.

The laminate type power storage modules 2a, 2b, 2c and 2d constituting the battery module 7 having the four-layer structure shown in Figs. 7A to 7C are constituted by the laminate type power storage module 2 constituting the assembled battery 6 The positive electrode 61 of the battery element 60 is electrically connected to the first metal foil inner exposed portion 14 in the battery element chamber 42 and the negative electrode 63 is electrically connected to the second metal foil inner exposed portion 24 The positions at which the metal foil is exposed on the outer surface of the external body 33 are different from each other due to the stacking position. In the case where the four cell-type power storage modules 2a, 2b, 2c and 2d are stacked in a staggered arrangement of the battery element chamber 42 and the space 71 in the stacking direction, Respectively.

The first metal foil outside exposed portion 16 is formed in the first flange 15 of the first layer laminated type power storage module 2a as the uppermost layer. 7B, the second metal foil outer exposed portion 28 is formed on the surface opposite to the second metal foil inner exposed portion 24, that is, on the bottom surface of the battery element chamber 42. As shown in Fig. The second heat-resistant resin layer 22 of the second casing member 20 is removed so that the second metal foil 21 is exposed.

As shown in Fig. 7C, the first and second metal foil outer exposed portions 18 are formed on the opposite side of the first metal foil inner exposed portion 14 from the second metal foil inner exposed portion 14, That is, on the ceiling surface of the battery element chamber 42. As shown in Fig. The first metal foil outer exposed portion 18 is exposed to the first metal foil 11 by removing the first heat resistant resin layer 12 of the first outer covering material 10. 7B, the second metal foil outside exposed portion 28 is formed on the surface opposite to the metal foil inner exposed portion 24, that is, on the bottom surface of the battery element chamber 42. As shown in Fig. The second heat-resistant resin layer 22 of the second casing member 20 is removed so that the second metal foil 21 is exposed.

As shown in Fig. 7C, the laminated-type power storage module 2d of the lowermost layer has a structure in which the first metal foil outer exposed portion 18 is located on the opposite side of the first metal foil inner exposed portion 14, (Not shown). The first metal foil outer exposed portion 18 is exposed to the first metal foil 11 by removing the first heat resistant resin layer 12 of the first outer covering material 10. Further, the second metal foil outside exposed portion 26 is formed in the second flange 25.

The assembled battery 7 is formed by laminating a heat transfer member 75 made of a conductive material between the three types of four laminate type power storage modules 2a, 2b, 2c and 2d, (Not shown), and the laminate-type power storage modules 2a, 2b, 2c are closely contacted with the heat conductor 75 and assembled. In this assembled state, the first metal foil outer exposed portion 18 and the second metal foil outer exposed portion 28 formed on the outer surface of the battery element chamber 42 are in contact with the heat transfer body 75. The battery element 60 of each layer is connected in series through the first metal foil 10 and the second metal foil 20 because the heat conductor 75 is a conductor. The energization with the external device is performed by the first metal foil outer exposed portion 16 of the first flange 15 of the uppermost laminate type module 2a and the second flange 25 of the lowest laminated power storage module 2c The second metal foil outer exposed portion 26 is provided with a positive electrode pin 36 and a negative electrode pin 37 attached thereto.

As described above, the laminated-type power storage module can be connected without using the connecting member by providing the exposed portion of the metal foil on the contact portion of the stacked laminated power storage module. Although the assembled battery 7 uses the heat conductor 75 as a conductive portion with the heat conductor 75 interposed therebetween for the purpose of improving the cooling effect, The exposed portions can be brought into direct contact with each other to obtain conduction.

[Materials and Molding of First Exterior Material and Second Exterior Material]

The first casing member 10 is formed such that the first heat resistant resin layer 12 is bonded to one surface of the first metal foil 11 through the first adhesive layer and the first thermoplastic resin member 12 is bonded to the other surface thereof via the second adhesive layer. The stratum corneum (13) is stuck together. The first metal foil inner exposed portion 14 is formed by removing the first thermoplastic resin layer 13 and the second adhesive layer and the first metal foil outer exposed portions 16 and 18 are formed by removing the first The thermoplastic resin layer 13 and the second adhesive layer or the first heat-resistant resin layer 12 and the first adhesive are removed. When the embossed portion 45 is formed by press molding, press forming is performed after the metal exposed portion is formed.

The second outer sheath 20 is formed such that the second heat-resistant resin layer 22 is bonded to one surface of the second metal foil 21 via the third adhesive layer and the second thermoplastic resin layer 22 is bonded to the other surface via the fourth adhesive layer. A stratum corneum 23 is stuck. The second metal foil inner exposed portion 24 is formed by removing the second thermoplastic resin layer 23 and the fourth adhesive layer and the second metal foil outer exposed portions 26 and 28 are formed by removing the first adhesive layer, And the second thermoplastic resin layer 23 and the fourth adhesive layer, or the second heat-resistant resin layer 22 and the third adhesive layer are removed in response to the surface to be formed.

1B, 2B, 6, 7B, and 7C, the first adhesive layer, the second adhesive layer, the third adhesive layer, and the fourth adhesive layer are not shown.

A preferable material of the first metal foil 11 is a soft aluminum foil, and the thickness is preferably 20 to 150 mu m. From the viewpoints of moldability and cost, a soft aluminum foil with a thickness of 30 to 80 m is particularly preferable. On the other hand, a preferable material of the second metal foil 21 is soft or hard aluminum foil, stainless steel foil, nickel foil, copper foil and titanium foil. The thickness of these foils is preferably from 10 탆 to 150 탆, and preferably from 15 탆 to 100 탆 in terms of impact resistance, bending resistance and cost.

The first metal foil 11 and the second metal foil 21 may be plated foil or clad foil. For example, as the second metal foil 21, a plated foil made of nickel plated with copper or a clad foil made of stainless steel and nickel can be used.

It is preferable that a chemical conversion coating is formed on the side of the first metal foil layer 11 and the second metal foil layer 21 on the side where at least the metal foil exposed portions 14, 16, 24, and 26 are present. The chemical conversion coating is a film formed by chemical conversion treatment on the surface of the metal foil. Since the chemical conversion treatment is carried out in this way, corrosion of the surface of the metal foil by the contents (electrolytes, etc.) Even when the module is made with an electrolyte, there is no discoloration or deterioration, and the influence of corrosion due to moisture in the atmosphere and the like can be reduced. Although the chemical conversion treatment layer itself has almost no conductivity, the coating film has a very small thickness and thus has little electrical resistance. For example, the metal foil is subjected to a chemical conversion treatment by performing the following processing. That is, on the surface of the metal foil subjected to the degreasing treatment,

1) phosphoric acid,

Chromic acid,

An aqueous solution of a mixture containing at least one compound selected from the group consisting of metal salts of fluorides and non-metal salts of fluorides

2)

At least one resin selected from the group consisting of an acrylic resin, a chitosan derivative resin and a phenol resin,

An aqueous solution of a mixture containing at least one compound selected from the group consisting of chromic acid and chromium (III) salts

3)

At least one resin selected from the group consisting of an acrylic resin, a chitosan derivative resin and a phenol resin,

At least one compound selected from the group consisting of chromic acid and chromium (III) salt,

An aqueous solution of a mixture containing at least one compound selected from the group consisting of metal salts of fluorides and non-metal salts of fluorides

The surface of the metal foil is coated with an aqueous solution of any one of the above-mentioned 1) to 3), followed by drying to conduct a chemical conversion treatment.

The above-mentioned chemical conversion film is preferably from 0.1 mg / m 2 to 50 mg / m 2, particularly preferably from 2 mg / m 2 to 20 mg / m 2 as the chromium adhering amount (per one side).

As the heat-resistant resin constituting the first heat-resistant resin layer 12 and the second heat-resistant resin layer 22, a heat-resistant resin which does not melt at the heat room temperature at the time of heat sealing is used. As the heat resistant resin, it is preferable to use a heat resistant resin having a melting point higher than the melting point of the thermoplastic resin constituting the first thermoplastic resin layer 13 and the second thermoplastic resin layer 23 by at least 10 DEG C, It is particularly preferable to use a heat-resistant resin having a melting point higher than 20 deg. For example, in addition to a polyester film or a polyamide film, a stretched film such as a polyethylene naphthalate film, a polybutylene naphthalate film, or a polycarbonate film is preferable. The thickness is preferably in the range of 9 탆 to 50 탆.

As the first thermoplastic resin layer 13 and the second thermoplastic resin layer 23, at least one kind of thermoplastic resin selected from the group consisting of polyethylene, polypropylene, olefin-based copolymer, acid-modified product thereof and ionomer thereof (Undrawn) film is preferable, and the thickness is preferably in the range of 20 탆 to 80 탆.

The first adhesive layer and the third adhesive layer are preferably a two-liquid curing type polyester polyurethane or polyether polyurethane adhesive, and the second adhesive layer and the fourth adhesive layer are preferably polyolefin adhesives in consideration of electrolyte resistance. The preferred application of each adhesive is from 1 g / m2 to 5 g / m2.

The method of forming the metal foil-exposed portions in the first facer 10 and the second facer 20 is not limited at all. For example, in a process of attaching a metal foil and a resin layer by a dry lamination method, an adhesive is applied using a gravure roll on which a portion not adhering is adhered to form an adhesive uncoated portion, The resin layer on the adhesive non-coated portion is removed to expose the metal foil. The first casing member 10 and the second casing member 20 used in the laminate type power storage module 2 of the embodiment have the metal foil exposed portions 14, 16, 24, and 26 on the surface of the thermoplastic resin layer side The first metal foil 11 and the first thermoplastic resin layer 13 and the second metal foil 21 and the second thermoplastic resin layer 23 are brought into contact with each other and then the metal foil exposed portion 14 , 16, 24, 26). The first metal foil 11 and the first heat-resistant resin layer 12, the second metal foil 21, and the second heat-resistant resin layer 22 are bonded to each other by a well- It is pasted by attachment method.

In the case where the metal foil outer exposed portion is formed on the first heat resistant resin layer 12 and / or the second heat resistant resin layer 22 side of the first casing material 10 and / or the second casing material 20, The resin layer is removed after the first metal foil 11 and the first heat-resistant resin layer 12, the second metal foil 21 and the second heat-resistant resin layer 22 are bonded together by the above-described method.

1A and the like, when the embossed portion 45 is formed by press molding in the first casing member 10, press forming is performed after the metal exposed portion is formed. In the molding of the first casing member 10 shown in the drawing, the first metal foil inner side exposed portion 14 is pressed by a molding die made of a female mold and a pushing mold inserted into a male mold, a male mold, . When the embossed portion is formed on the second casing member 20, the press molding is similarly performed.

The first casing member 10 is formed by cutting the two sides without the first flange to a size that protrudes slightly from the second casing member 20 and bending the protruding portion after the heat sealing. Contact between the first metal foil 11 and the second metal foil 21 can be prevented. The second casing member 20 may be bent while the dimensions of the first casing member 10 and the second casing member 10 are reversed.

[Structure and Material of Battery Element]

The laminate type power storage modules 2, 2a, 2b, 2c, and 2d use a bare cell as a battery element 60. [ Details of the electrolyte sealed together with the bare cell and the bare cell are as follows.

(Bare cell)

The bare cell as the battery element 60 is composed of a positive electrode 61, a separator 62, and a negative electrode 63. The shape of the cell is not limited to the winding shape in Fig. As another form of the bare cell, a positive electrode and a negative electrode are cut to the size of a cell, and a plurality of separators are combined with each foil to alternately stack the positive and negative electrodes together. For example, by ultrasonic bonding.

The positive electrode 61 is preferably composed of a current collector and a positive electrode active material, and a metal foil is generally used for the current collector. As the metal foil, a hard or soft aluminum foil having a thickness of 7 to 50 mu m is preferably used, and a portion in contact with the metal exposed portion 14 is preferably free of active material. The composition of the positive electrode active material layer is not particularly limited. For example, PVDF (polyvinylidene fluoride), SBR (styrene butadiene rubber), CMC (carboxymethyl cellulose sodium salt and the like), PAN (polyacrylonitrile) , A linear polysaccharide and the like, a lithium salt (for example, lithium cobaltate, lithium nickel oxide, lithium iron phosphate, lithium manganese, or the like) is added. The thickness of the positive electrode active material layer is preferably set to 2 to 300 mu m. The positive electrode active material layer may further contain a conductive auxiliary agent such as carbon black or CNT (carbon nanotube).

Further, a binder is preferably used between the current collector and the positive electrode active material to increase the adhesion. The binder is not particularly limited, and examples thereof include layers formed of PVDF, SBR, CMC, PAN, linear polysaccharide and the like. In order to improve the conductivity between the current collector and the positive electrode active material layer, a conductive auxiliary agent such as carbon black or CNT (carbon nanotube) may be added to the binder layer. The thickness of the binder layer is preferably set to 0.2 to 10 mu m. By setting the binder layer to 10 mu m or less, increase in the internal resistance of the bare cell due to the binder not having conductivity can be minimized.

The negative electrode 63 is preferably composed of a current collector and a negative electrode active material, and a metal foil is generally used for the current collector. As the metal foil, a copper foil having a thickness of 7 mu m to 50 mu m is preferably used, and other aluminum foil, titanium foil or stainless foil can be used. It is preferable that the portion contacting the metal exposed portion 24 as in the case of the positive electrode is free of active material. The composition of the negative electrode active material layer is not particularly limited. For example, an additive (for example, graphite, lithium titanate, a Si-based alloy, a tin-based alloy, etc.) is added to a binder such as PVDF, SBR, CMC, PAN, Alloy or the like) is added. It is preferable that the thickness of the negative electrode active material layer is set to 1 mu m to 300 mu m. The negative electrode active material layer may further contain a conductive auxiliary agent such as carbon black or CNT (carbon nanotube).

Between the current collector and the negative electrode active material, a binder is preferably used to increase the adhesion. The binder is not particularly limited, and examples thereof include layers formed of PVDF, SBR, CMC, and PAN. In order to improve the conductivity between the current collector and the negative electrode active material layer, a conductive auxiliary agent such as carbon black or CNT may be added to the binder layer. The thickness of the binder layer is preferably set to 0.2 to 10 mu m. By setting the binder layer to 10 mu m or less, increase in internal resistance of the bare cell due to the binder not having conductivity can be suppressed as much as possible.

When the binder layer and the positive electrode active material layer are laminated on the current collector (metal foil) constituting the positive electrode 61, the composition of each layer is sequentially coated on the metal foil and dried. The same applies to the case where the binder layer and the negative electrode active material layer are laminated on the current collector (metal foil) constituting the negative electrode 63.

The separator 62 is not particularly limited. For example, a separator made of a polyethylene separator, a polypropylene separator, a double-layer film made of a polyethylene film and a polypropylene film, or a resin separator A separator composed of a wet or dry porous film coated with a heat resistant inorganic material, and the like. The thickness of the separator 62 is preferably set to 5 탆 to 50 탆.

In addition, preferred materials when the laminate type power storage module of the present invention is an electric double layer capacitor are as follows.

The collector of the positive electrode 61 and the current collector of the negative electrode 63 are preferably hard aluminum foils having a thickness of 7 to 50 mu m. The positive electrode active material and the negative electrode active material are preferably carbon black or CNT (carbon nanotube). The separator is preferably a porous polycellulose membrane having a thickness of 5 탆 to 100 탆 or a nonwoven fabric having a thickness of 5 탆 to 100 탆.

(Electrolyte)

The electrolyte to be enclosed with the battery element is not particularly limited. However, the electrolyte is preferably at least one selected from the group consisting of water, ethylene carbonate, propylene carbonate, dimethyl carbonate, ethylmethyl carbonate, diethyl carbonate and dimethoxyethane And an electrolyte including a lithium salt. The lithium salt is not particularly limited, and examples thereof include lithium hexafluorophosphate, lithium tetrafluoroborate, quaternary ammonium salt of tetrafluoroboric acid, and the like. Examples of the quaternary ammonium salt include tetramethylammonium salts and the like. The electrolyte may be gelled with PVDF, PEO (polyethylene oxide) or the like.

[Laminate type power storage module and manufacturing method of battery]

The laminate type power storage modules 2, 2a, 2b, 2c, and 2d can be manufactured by the following process.

(1) The first metal foil inner exposed portion 14, the first metal foil outer exposed portion 16 or the first metal foil exposed portion 18, and the embossed portion 45 are formed in a required position by the above- The first exterior material 10 is formed. A second outer covering member 20 having the second metal foil inner exposed portion 24, the second metal foil outer exposed portion 26, or the second metal foil outer exposed portion 28 is formed at a required position.

(2) The first outer packaging material 10 is placed on the first thermoplastic resin layer 13 so that the first metal foil inner exposed portion 14 in each embossed portion 45, which becomes the battery element chamber 42, The battery element 60 is loaded so that the positive electrode 61 of the element 60 is in contact with the electrolyte and the electrolyte is injected using a syringe or the like.

(3) The second casing member 20 is superimposed while being aligned so that the second metal foil inner exposed portion 24 of the second casing member 20 is in contact with the negative electrode 63 of the battery element 60, , 33) are assembled. The first flange 15 is extended from the end of the second casing member 20 and the second flange 25 is directed from the end of the first casing member 10, The metal foil outer side exposure 16 and the second metal foil outer side exposed portion 26 are exposed on the outer surface of the enclosure 32, 33.

(4) The heat-sealed portion 52a is formed by using the heated heat plate.

(6) A clip is connected to the first metal foil outer exposed portion 16 of the first flange 15 and the second metal foil outer exposed portion 26 of the second flange 25 to perform preliminary filling. Deg.] C for 8 hours.

(7) The battery element 60 and the electrolyte are sealed in the battery element chamber 42 by thermally sealing the unsealed portion with a heated hot plate under reduced pressure to form the heat-sealed portion 52b.

(8) The connection holes 17 and 27 are drilled in the first metal foil outer exposed portion 16 of the first flange 15 and the second metal foil outer exposed portion 26 of the second flange 25.

The above production method is merely one example, and is not particularly limited to such a production method.

The laminate-type power storage modules 2, 2a, 2b, 2c, and 2d thus manufactured are stacked with a required number of layers stacked or interposed between the heaters 75, and neighboring modules in the stacking direction are connected And assembles the battery. The number of layers in the assembled battery of the present invention is arbitrary.

The use of the battery of the present invention is not limited, but it may be applied to a power source such as an automobile, a bicycle, a motorcycle, a train, an airplane, a ship, etc., A lithium ion capacitor module for a battery (a lithium ion battery, a lithium polymer battery, etc.) module, a solid battery module, and an electric double layer capacitor module for the above purposes.

[Example]

Next, specific examples of the present invention will be described, but the present invention is not limited to these examples.

<Example 1>

Four laminate-type modules 2 shown in Figs. 1A and 1B were manufactured to produce the assembled battery 5 shown in Figs. 2A and 2B.

The first metal foil 11 was a soft aluminum foil of A8079 having a thickness of 40 탆 classified by JIS H4160, and both surfaces were chemically treated. The first heat-resistant resin layer 12 is a biaxially stretched polyamide film having a thickness of 25 mu m. The first thermoplastic resin layer 13 is an unoriented polypropylene film having a thickness of 40 mu m. The second metal foil 21 was a soft stainless steel foil of SUS304 having a thickness of 20 mu m, and both surfaces of both surfaces were chemically treated. The second heat-resistant resin layer 22 is a biaxially stretched polyester film having a thickness of 12 탆. The second thermoplastic resin layer 23 is an unoriented polypropylene film having a thickness of 40 mu m.

The dimensions of the first metal foil inner exposed portion 14 and the second metal foil inner exposed portion 24 are 30 mm x 30 mm and the first metal foil outer exposed portion 16 and the second metal foil outer exposed portion 26 Is 20 mm x 200 mm.

(First exterior material)

The first heat resistant resin layer 12 was bonded to one side of the first metal foil 11 by a dry lamination method with a two-liquid curing type polyester polyurethane adhesive having a coating thickness of 3 占 퐉 and dried at 50 占 폚 in an aging furnace, For 3 days. Next, when the two-liquid curing type olefin-based adhesive having a coating thickness of 2 占 퐉 is applied to the opposite surface of the first metal foil 11 by a dry lamination method to a coating thickness of 2 占 퐉, nine first metal foil inner- The first thermoplastic resin layer 13 and the second thermoplastic resin layer 13 are bonded to each other to form an adhesive-unformed portion corresponding to the dimension and position of the first metal foil outer exposed portion 16 and the first metal foil outer exposed portion 16. And then cured in an aging furnace at 40 DEG C for 3 days.

After the curing, the first thermoplastic resin layer 13 on the adhesive non-coated portion is cut and removed by a laser blade, and the first metal foil inner exposed portion 14 and the first metal foil outer portion 14 exposed by the first metal foil 11 An exposed portion 16 was formed.

Next, press molding is performed to a depth of 4 mm in a manner that the male mold is in contact with the first metal foil inner exposed portion 14 on the male-like surface of the male mold using a male mold, a male mold and a push mold having a size of 40 mm, Thereby forming an embossed portion to be the seal 42. And the periphery was trimmed to obtain the first casing member 10. The plane dimension of the first casing member 10 is 140 mm 160 mm.

(Second exterior material)

The second heat resistant resin layer 22 was bonded to one side of the second metal foil 21 by a dry lamination method with a two-liquid curing type polyester polyurethane adhesive having a coating thickness of 3 mu m, Cured. Next, when the two-liquid curing type olefin adhesive having a coating thickness of 2 占 퐉 was applied to the opposite surface of the second metal foil 21 by a dry lamination method with a coating thickness of 2 占 퐉, nine second metal foil inner exposed parts The second thermoplastic resin layer 23 is formed by forming an adhesive not shown corresponding to the dimension and position of the second metal foil outer exposed portion 26 and the second metal foil outer exposed portion 26. [ And then cured in an aging furnace at 40 DEG C for 3 days.

The second metal foil inner exposed portion 24 and the second metal foil outer exposed portion 26 exposed by the second metal foil 21 are removed by cutting the second thermoplastic resin layer 23 on the adhesive non- ). Further, the periphery was trimmed to obtain the second casing member 20. The planar dimension of the second casing member 20 is 150 mm x 160 mm, which is larger than that of the first casing member 10.

(Electrode element)

As the electrode element 60, a bare cell was fabricated using the following materials.

The collector of the positive electrode 61 is a hard aluminum foil of A1100 classified by JIS H4160, and has a thickness of 15 mu m and a width of 500 mm. The collector of the negative electrode 63 is a hard copper foil of C1100R classified by JIS H3100, and has a thickness of 15 mu m and a width of 200 mm. 60 parts by mass of a positive electrode active material mainly composed of lithium cobalt oxide, 10 parts by mass of PVDF as a binder and an electrolyte retaining agent, 5 parts by mass of acetylene black (conductive material), 1 part by mass of N-methyl- And 25 parts by mass of money (organic solvent) is kneaded and dispersed. The negative electrode active material-forming paste was prepared by mixing 57 parts by mass of negative electrode active material mainly composed of carbon powder, 5 parts by mass of PVDF as a binder and electrolyte preservative, 10 parts by mass of a copolymer of hexafluoropropylene and maleic anhydride, 3 parts by mass) and 25 parts by mass of N-methyl-2-pyrrolidone (organic solvent) are kneaded and dispersed. The binder solution is a binder solution in which PVDF is dissolved in a solvent (dimethylformamide). The separator 62 is a wet separator having a width of 38 mm and a thickness of 8 탆. The electrolyte is a solution prepared by dissolving lithium hexafluorophosphate (LiPF ₆ ) in a concentration of 1 mol / L in a mixed solvent of ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC) .

The positive electrode (61) was manufactured by the following process. First, the binder liquid was applied to the entire one surface of the current collector and dried at 100 DEG C for 30 seconds to form a binder layer having a thickness of 0.5 mu m after drying. Next, a paste for a positive electrode active material layer liquid (active material layer liquid) paste was applied to the surface of the binder layer, dried at 100 DEG C for 30 minutes and then hot pressed to obtain a sheet having a density of 4.8 g / A positive electrode active material layer having a thickness of 120 mu m was formed. Further, the film was cut into a coil shape having a width of 35 mm by taking out a width.

The negative electrode (63) was manufactured by the following process. First, a binder liquid was applied to one side of the current collector and dried at 100 DEG C for 30 seconds to form a binder layer having a thickness of 0.5 mu m after drying. Subsequently, a negative electrode active material layer liquid paste was applied on the surface of the binder layer, dried at 100 占 폚 for 30 minutes, and then hot pressed to form a negative electrode active material layer having a density of 1.5 g / Respectively. Further, the film was cut into a coil shape having a width of 35 mm by taking out a width.

Next, each of the negative electrode 63 (current collector-negative electrode active material layer) / separator 62 / (positive electrode active material layer-current collector) positive electrode 61 / separator is gradually laminated in order of winding, A positive electrode 61 was exposed on the surface of the negative electrode 63 and a negative electrode 63 was exposed on the opposite surface thereof to form a bare cell having a thickness of 4 mm and a thickness of 38 mm.

(Assembly of laminated type power storage module and assembled battery)

(1) The first outer packaging material 10 is placed on the first thermoplastic resin layer 13 and the first metal foil inner exposed portion 14 in each embossment portion 45 forming the battery element chamber 42 The battery element 60 was loaded so that the positive electrode 61 of the battery element 60 was in contact with the electrolyte and the electrolyte was injected using a syringe or the like.

(2) The second casing member 20 is superimposed on the second casing member 20 while the second metal foil inner exposed portion 24 of the second casing member 20 is brought into contact with the negative electrode 63 of the battery element 60, ). In this assembled state, the first flange 15 is directed from the end of the second casing member 20 and the second flange 25 is directed from the end of the first casing member 10, 16 and the second metal foil outside exposed portion 26 are exposed on the outer surface of the external body 32.

(3) Using a hot plate heated to about 200 占 폚, hot sealing was performed for 3 seconds at a pressure of 0.3 MPa to form a heat-sealed portion 52a. The width of the heat-sealed portion 52a between the embossed portions 45 is 5 mm.

(4) A clip is connected to the first metal foil outer exposed portion 16 of the first flange 15 and the second metal foil outer exposed portion 26 of the second flange 25 until a battery voltage of 4.2 V is generated Charging was performed, and the battery element chamber 42 was degassed by putting it in a thermostatic chamber at 100 캜 for 8 hours.

(5) The unsealed portion was hot-sealed with a hot plate heated to about 200 占 폚 under a reduced pressure of 86 占 하여 to form a heat-sealed portion 52b so that the battery element 60 and the electrolyte were sealed in the battery element chamber 42 . The width of the heat-sealed portion 52b between the embossed portions 45 is 5 mm.

(6) As a countermeasure against short-circuiting, the end edge of the first casing member 10 on the side of the second flange 25 and the edge of the second casing member 20 on the side of the first flange 15 have a thickness of 25 탆 And the first metal foil 11 and the second metal foil 21, which were exposed to the end face, were coated. In addition, the second exterior member 20 having the other two sides opened out was bent toward the first exterior member 10 to perform insulation measures and to reinforce the lateral strength. 2A shows a state before bending.

(7) Three connection holes 17 and 27 were drilled in the first metal foil outer exposed portion 16 of the first flange 15 and the second metal foil outer exposed portion 26 of the second flange 25.

By the above steps, four laminate type electrical storage modules 2 were produced.

(8) As shown in Figs. 2A and 2B, the four laminate type modules 2 are staggered so that the first flange 15 and the second flange 25 of the modules neighboring in the stacking direction overlap each other Respectively.

(9) The four laminate type modules 2 are connected in series by the connecting pins 35, the positive electrode pins 36 are attached to the first metal foil outside exposed portion 16 of the uppermost layer, The negative electrode pin (37) was attached to the metal foil outside exposed portion (26). By the above-described process, a battery module 5 was fabricated.

The assembled battery 5 has a space 70 having a rectangular shape with a rectangular cross section on the heat-sealed portion 52a (the width of the heat-sealed portion 52a is 5 mm) and the height of the embossed portion is 4 mm) And a space having a rectangular cross section is formed on the heat-sealed portion 52b (the width of the heat-sealed portion 52b is 5 mm) × (the height of the embossed portion is 4 mm).

<Comparative Example 1>

Comparative Example 1 is a laminated battery in which four laminate-type power storage modules having different structures from those of Example 1 are laminated.

In the laminated type power storage module 2 of Example 1, nine battery elements 60 are sealed in each battery element chamber 42, and metal foil exposed portions are formed on the inner and outer surfaces of the outer body, So that conduction with the battery element 60 can be obtained without using it. With respect to these laminate-type power storage modules 2, the laminate-type module of Comparative Example 1 is a laminate-type module in which one battery element is encapsulated in one battery element chamber and the ability equivalent to that of nine battery elements of Example 1 is obtained The size of the battery element was increased. The external body of the laminate-type module of Comparative Example 1 is a module which does not have a metal foil-exposed portion on the inside or outside, and is connected to a tab lead to the battery element and drawn out to the outside.

(External body)

The casing member is composed of a portion having an embossed portion that becomes a battery element chamber corresponding to the first casing member 10 of Embodiment 1 and a flat portion that covers the opening portion of the embossed portion corresponding to the second casing member 20 of Embodiment 1. [ . The outer body is formed by folding the outer sheath in two. The material constituting the exterior material is a soft aluminum foil having a thickness of 40 占 퐉 (a soft aluminum foil of A8021 classified by JIS H4160, a heat-resistant resin layer having a thickness of 25 占 퐉 and a thermoplastic resin layer Is a polypropylene film having a thickness of 40 mu m.

The heat-resistant resin layer was bonded to the entire surface of one side of the metal foil with a polyester urethane-based adhesive having a coating amount of 3 g / m 2, and the entire surface of the other side was coated with a polyolefin adhesive having a coating amount of 2 g / Thermoplastic resin layer was cemented, followed by curing in a thermostatic chamber at 40 占 폚 for 3 days. The exterior member has no metal foil exposed portion, and the aluminum foil is entirely covered with the resin layer.

The exterior material was subjected to press molding to form an embossed portion having a size of 115 mm x 115 mm x 4 mm in height, and trimming was performed in anticipation of the dimensions of the flat portion and the hot sealing portion scheduled portion.

(Battery element and tab lead)

The battery element was made to have an outer shape of 110 mm square using the same material as in Example 1.

The positive electrode tab lead was formed by exposing 5 mm on one end side in the longitudinal direction of a soft aluminum foil (soft aluminum foil of A1050 classified by JIS H4000) having a length of 30 mm, a width of 3 mm and a thickness of 100 mu m, A maleic anhydride-modified polypropylene film having a length of 10 mm, a width of 5 mm and a thickness of 50 占 퐉 (melting point of 140 占 폚, MFR of 3.0 g / 10 minutes) was bonded by heat-sealing.

The negative electrode tab lead was formed by exposing 5 mm on one end side in the longitudinal direction of a nickel foil having a length of 40 mm, a width of 3 mm and a thickness of 100 mu m, And an insulating film made of a maleic acid-modified polypropylene film (melting point: 140 占 폚, MFR: 3.0 g / 10 min) was sandwiched and bonded by a heat seal.

The end of the positive electrode tab lead was bonded to the positive electrode of the battery element and the negative electrode tab lead was stuck to the negative electrode and the tip of the positive electrode tab lead and the negative electrode tab lead were drawn out from the same side of the battery element.

(Assembly of laminated type power storage module and assembled battery)

(1) For exterior materials, mark the bending position with a ruler or the like in advance.

(2) The battery element is loaded in the embossed portion of the outer casing, the outer casing is bent so that the insulating film of the tab lead is placed on the heat- .

(3) The two sides including the sides for pulling out the tab leads were sandwiched with a pressure of 0.3 MPa using a hot plate heated to 200 DEG C, and then hot-sealed for 3 seconds.

(4) 45 ml of the same electrolyte as in Example 1 was injected from the unsealed side with a syringe, and temporary filling and degassing were carried out in the same manner as in Example 1.

(5) The unsealed side was hot-sealed at a pressure of 0.3 MPa using a hot plate heated to 200 DEG C under a reduced pressure of 0.086 MPa while being discharged at 3.0 V, and the battery element and the electrolyte Respectively.

By the above steps, four laminate type electrical storage modules were produced.

(6) Four laminate type modules were stacked and connected in series to assemble the assembled battery.

<Evaluation>

The assembled batteries of Example 1 and Comparative Example 1 obtained as described above were evaluated according to the following evaluation methods. The evaluation results are shown in Table 1.

After the battery pack was fully charged to 16.8 V, charging and discharging (charging in 1 hour, discharging in 1 hour) at a room temperature of 18 ° C was repeated 100 times, and the voltage and capacity at the time of full charging were measured again. Further, when a full-charged battery was discharged at 1C, the temperature at the time of discharging at 0.2C was measured with a temperature sensor, and the average value was obtained. The temperature measurement position is the center of the module of the third layer together with Example 1 and Comparative Example 1, and Example 1 is the center of the outer surface of the center of the embossed portion at the center of the three columns and three columns, and Comparative Example 1 is the central portion of the embossed portion.

[Table 1]

As shown in Table 1, in Example 1 and Comparative Example 1, no difference was observed in the battery capacity, and the same result was obtained even when the charge and discharge cycles of 100 cycles were repeated. With respect to the calorific value at the time of discharging, it was confirmed that the calorific value of Example 1 was suppressed and the heat radiating effect was high with respect to Comparative Example 1 of the discharge attempt of 1C discharge at 0.2C.

This application is a continuation of Japanese Patent Application No. 2015-83102, filed on April 15, 2015, which is incorporated herein by reference in its entirety.

It is to be understood that the terminology and expressions used herein is for the purpose of description and should not be interpreted to limit the scope of the present invention, It should be appreciated that variations are also permissible.

The laminate type power storage module of the present invention can be suitably used as various power supplies.

2, 2a, 2b, 2c, 2d: Laminate type power storage module
5, 6, 7: Batteries
10: First exterior material
11: First metal foil
12: First heat-resistant resin layer
13: The first thermoplastic resin layer
14: First metal foil inner exposed portion
15: 1st flange
16, 18: first metal foil outer exposed portion
20: Secondary casing
21: Second metal foil
22: Second heat-resistant resin layer
23: the second thermoplastic resin layer
24: second metal foil inner exposed portion
25: second flange
26, 28: second metal foil outer exposed portion
32, 33, 80, 82:
42, 82, 83a, 83b: battery element room
45, 46: emboss part
52a and 52b:
60: Bare cell (battery element)
61: Positive
62: separator
63: negative polarity
70, 71: Space
75:

Claims (6)

A laminate type power storage module,
Wherein the first metal foil layer is laminated on one surface of the first metal foil and the first thermoplastic resin layer is laminated on the other surface thereof and the first metal foil inner exposed portion on the side of the first thermoplastic resin layer surface on which the first metal foil is exposed And a second heat-resistant resin layer is laminated on one surface of the second metal foil and a second thermoplastic resin layer is laminated on the other surface, and a second metal foil is laminated on the surface of the second thermoplastic resin layer, And a battery element having a positive electrode, a negative electrode and a separator disposed between the positive electrode and the negative electrode,
At least one of the first exterior material and the second exterior material has an embossed portion in an area including the first metal foil inner side exposed portion and the second metal foil inner side exposed portion and the first thermoplastic resin layer of the first exterior material and the second exterior material The second thermoplastic resin layer is opposed to the first thermoplastic resin layer and the second thermoplastic resin layer and is surrounded by the heat-sealed portion fused with the first thermoplastic resin layer and the second thermoplastic resin layer, whereby the first metal foil inner exposed portion and the second metal foil inner exposed portion come into contact with each other, And a second metallic foil exposed on the first metallic foil exposed portion and a second metallic foil exposed on the external surface of the metallic body, An outer exposed portion is formed,
Wherein the battery element enclosed in the battery element chamber together with the electrolyte has a positive electrode electrically connected to the first metal foil inner exposed portion and a negative electrode electrically connected to the second metal foil inner exposed portion,
A plurality of the lamination type power storage modules are stacked in a manner that a space is formed on the heat sealing portion and the adjacent lamination type power storage module in the stacking direction is connected to the first metal foil outside exposed portion and the second metal foil outside exposed portion As a battery. The method according to claim 1,
Wherein a plurality of laminate type power storage modules are stacked so that the battery element chamber and the heat sealing portion are overlapped with each other in the stacking direction of the laminate type power storage module. 3. The method according to claim 1 or 2,
And a heat transfer element is disposed between adjacent lamination type power storage modules in the stacking direction. 3. The method according to claim 1 or 2,
Wherein the space is a cooling gas flow passage. The method according to claim 1,
Wherein the space and the battery element chamber are adjacent to each other only in a direction orthogonal to the lamination direction of the laminate type power storage module. 3. The method of claim 2,
Wherein the space and the battery element chamber are adjacent to each other in both the lamination direction of the laminate-type power storage module and the direction orthogonal to the lamination direction.

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