Art
[1]This application claims the benefit of priority based on the Korea Patent Application No. 2017-0120637 years September 19, 2017, and all information disclosed in the literature of the Korea patent application are included as part of the specification.
[2]The present invention relates to a pouch-shaped battery case including a heat radiation layer, and the cell case comprises an outer cover layer, a metal barrier layer and an inner adhesive layer, wherein the metal barrier layer is made of a structure which includes a heat radiation layer is provided between the plurality of metal layers It relates to a pouch-shaped battery case.
BACKGROUND
[3]
There is demand for batteries as an energy source is increasing rapidly as the development of technology and demand for mobile devices increases. Further research is being conducted on many types of cells that can respond to a variety of devices.
[4]
A thin thickness in shape of the battery with high selections from the demand for prismatic secondary batteries or pouch type secondary battery which can be applied to such as a mobile phone, the material surface in the lithium ion with the advantages of high energy density, discharge voltage, output stability cells, high demand for lithium secondary batteries such as a lithium ion polymer battery.
[5]
Recently, a stack type or stacking / folding type electrode assembly or the like the pouch-shaped battery of a structure built in a pouch-shaped battery case made of a laminate sheet, low manufacturing cost, small weight, easy deformation reasons, has attracted a lot of attention.
[6]
The laminate sheet is largely made up of the outer coating layer, a metal barrier layer and an inner sealing layer. When accommodating portion for accommodating the electrode assembly formed in a laminate sheet, while the outer surface of the metal barrier layer larger than the inner surface stretching stress is focused and will crack (crack) is generated. Therefore, it is difficult to form over a certain depth of the electrode assembly storing portion.
[7]
Thus, if a crack occurs in a battery case, the electrolyte leakage may be caused various problems in terms of safety as well as to be the cycle characteristics of the battery cell decreases.
[8]
Although the thermal conductivity is excellent using the metal in the metal barrier layer of the laminated sheet, and the thermal conductivity lowered by a polymer layer surrounding the metal barrier layer. This causes a thermal runaway phenomenon of the abnormal use of the battery cells occurs, or to ignite an explosion of the battery cells is a problem.
[9]
In this regard, the Chinese Patent Application No. 204 558 547 discloses by the external protective film, a first adhesive layer, an aluminum foil, and the second adhesive layer, one starts to the layered structure lithium battery aluminum film comprising a porous buffer layer and the heat-sealing film, a porous buffer layer because it uses only a single aluminum foil, it is difficult to obtain an effect that moldability is improved.
[10]
Japanese Laid-Open Patent Publication No. 2014-086361 discloses an aluminum foil (A), modified polyolefin resin layer (B), the sealant film (C) of nickel chromium in the at least B-side surface of the stacked and A in this order, nickel, silver, platinum and gold and copper, at least one metal selected from lead discloses a secondary battery exterior aluminum foil laminated sheet formed of a membrane having a thickness of 10 ~ 500㎚.
[11]
However, the invention does not include a heat dissipation structure to dissipate heat quickly in the battery cell.
[12]
Accordingly, the pouch-shaped battery keyiseuyong laminate sheet metal barrier and to improve the standing moldability without increasing the thickness of the layer, the performance for discharging the heat in the battery cell situation a high need for an improved pouch-shaped battery case, which contains the to be
Detailed Description of the Invention
SUMMARY
[13]
The present invention heat between a battery case containing, outer coating layer, a metal barrier layer and the inner adhesive layer in order to solve the technical problem, which has been requested from the problems, and of the prior art, the metal barrier layer is a plurality of metal layers If made of a structure which includes a layer, it is possible to improve the moldability than the case of using a single metal layer.
[14]
In addition, it is possible to strengthen a standing heat dissipation without increasing the overall thickness of the metal barrier layer, a heat emission occurs in the battery cell can be made quickly.
Problem solving means
[15]
The pouch type battery case according to the present invention for achieving this purpose,
[16]
A positive electrode and a separator interposed between the negative electrode as a pouch-shaped battery case, the electrode assembly is accommodated in a stacked structure,
[17]
The battery case includes an outer coating layer, a metal barrier layer and an inner adhesive layer,
[18]
The metal barrier layer is composed of a structure which includes a heat radiation layer is provided between the plurality of metal layers.
[19]
Thus, the metal barrier layer of the pouch-shaped battery case according to the present invention when compared with a case made of a single metal layer having the same thickness as the bar, the sum of the thicknesses of the plurality of metal layers composed of a plurality of metal layers, the battery case the stress generated in the outer corner of the molding is relatively small. Accordingly, it is the depth to deep electrode assembly permits the formation of the receiving bar and can improve the capacity of the battery.
[20]
Further, by preventing the cracks caused in the battery case can be prevented such problems that the inlet and the cycle characteristics of the leak, and the outer material of the electrolyte decreases.
[21]
Bar which includes the heat radiating layer between the plurality of metal layers, may be the thickness of the plurality of metal layers to supplement that becomes the strength of a battery case according to the relative thin with load about, due to the presence of the heat dissipating layer in the battery cell, the exhaust heat can be generated quickly.
[22]
The present invention conventional could not only can have a lower thermal conductivity though due to the presence of the polymer layer around the metal barrier layer, using a highly heat-conductive metal to the metal barrier layer to ensure the insulation and sealing performance of the battery case you can solve the problem.
[23]
In one specific example, the metal barrier layer may be formed of a first metal layer, a heat radiating layer and the second metal layer are sequentially stacked structure.
[24]
The first metal layer and second metal layer may be formed of the same material, or may be a metal made of a different material from each other. For example, the first metal layer and / or the second metal layer may be formed of aluminum.
[25]
The heat dissipation layer may be formed of the same material as the first metal layer and second metal layer, or the first may be formed of a first metal layer and second metal layers with different materials.
[26]
The heat dissipation layer has a bar, the first metal layer and second metal layer by a bonding material filled in the heat dissipating layer made of a mesh structure or a porous structure is filled with structural adhesive material within the cavity as can be attached to both sides of each heat dissipating layer .
[27]
Therefore, a separate adhesive layer is not required between the between the first metal layer and the heat dissipation layer, and said second metal layer and the heat dissipation layer.
[28]
The adhesive material, if the material which can easily be made to coupling between the first metal layer, a heat radiating layer and the second metal layer is not particularly limited, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene renna terephthalate, polyethylene isophthalate, polycarbonate, polyester-based resin comprising a copolyester; Polyether-based adhesives; Polyurethane-based adhesives; Epoxy resins; Phenolic resins; Nylon 6, nylon 66, nylon 12; Polyamide based resin; Polyolefin-based resin comprising a polyolefin, acid modified polyolefin, the metal-modified polyolefin; Polyvinyl acetate resin; Cellulose-based adhesives; (Meth) acrylic resin; Polyimide-based resins; Amino resins containing urea resin, melamine resin; Chloroprene rubber, nitrile rubber, styrene-rubber comprising a butadiene rubber; It may be formed of at least one element selected from the group consisting of silicone-based resin.
[29]
In order to prevent the heat in the battery cells thermal runaway to the outside quickly discharge phenomenon takes place, and lower the blast to the risk of ignition of the battery cell, the heat dissipation layer is a material equal to the thermal conductivity of aluminum help or having also the higher thermal conductivity made to preferred bars, for example, the heat dissipating layer may be formed of one selected from the group consisting of aluminum (Al), beryllium (be), copper (Cu), silver (Ag) and gold (Au), or it may be made of the metal of an alloy containing two or more of them. The metal can form a network structure or a porous structure of a heat radiating layer.
[30]
If in one specific example, the adhesive material filled in the internal cavity of the heat dissipation layer made of a net structure to a three-dimensional porous structure, the through-hole formed, and the first metal layer and second metal layer by an adhesive material of the heat dissipation layer are bonded to each other may be in the form such as a unit member.
[31]
The inner adhesive layer is made of the first is composed of the inner adhesive layer and the second inner bonding layer, the first inner adhesive layer is surface-modified poly acidification as a layer which is located adjacent to the metal layer of propylene (Acidified-Polypropylene, PPa), the second internal adhesive layer may be made from polypropylene (polypropylene, PP) as a layer located on an outer side of said first internal adhesive layer.
[32]
The outer coating layer has a first outer coating layer and the second consists of the outer coating layer, the first outer coating layer is made of a layer positioned in the outermost polyethylene terephthalate (Polyethylene terephthalate, PET), the second outer coating is the the it may be formed of an oriented nylon layer positioned between the first outer covering layer and the metallic layer.
[33]
In one specific example, a bar that may be composed of a plurality of metal layers in order to improve the formability of the barrier metal layer, the metal layer may include two or more metal layers.
[34]
In addition, being able to combine the plurality of metal layers ensure a certain level of strength, and the heat dissipation layer made of a further metal material having a high thermal conductivity is located between the metal layers. That is, the metal barrier layer may be made of a case made in a structure which includes a heat radiation layer, and the thermal conductivity of the metal barrier layer is increased improving the heat dissipation characteristics for each among the three or more metal layers.
[35]
And the adhesive layer is interposed between the metal barrier layer and the outer coating layer, surface of the metal barrier layer facing the adhesive layer can be acidified with the surface-modified polypropylene layer combined structure.
[36]
The said acidification surface-modified polypropylene provides a time as the surface-modified so that the acidic functional group attached to the surface compared to the polypropylene and the bonding force of the metal barrier layer further improved effect. Thus, the inner adhesive layer made of the acidified surface-modified polypropylene is preferably located so close to the metal barrier layer.
[37]
The present invention also provides a battery pack including a pouch type secondary battery and a pouch type secondary battery comprising the pouch type battery case.
[38]
Specifically, the battery pack is high temperature stability and can be used in the long cycle characteristics and power of the device is required such as high rate characteristics, a detailed example of such a device, a mobile electronic device (mobile device), wearable electronic devices (wearable device ), the power tool (power tool) moves received power by the motor omniscient; Electric vehicles, including hybrid electric vehicles (Plug-in Hybrid Electric Vehicle, PHEV) including - an electric vehicle (Electric Vehicle, EV), hybrid electric vehicles (Hybrid Electric Vehicle, HEV), plug; Electric bicycles (E-bike), electric two-wheeled vehicle including an electric scooter (E-scooter); Electric golf carts (electric golf cart); And the like electric power storage device (Energy Storage System), but is not limited to this.
[39]
Structure and its manufacturing method of the devices are so well known in the art, in the present specification a detailed description thereof will be omitted.
Brief Description of the Drawings
[40]
1 is a vertical cross-sectional view of the pouch-shaped battery case in accordance with one embodiment.
[41]
Figure 2 is a vertical cross-sectional view of the pouch-shaped battery case according to another embodiment.
[42]
Figure 3 shows a network structure or a porous structure of a heat radiation layer of a different structure.
Mode for the Invention
[43]
Reference to the accompanying drawings self having ordinary skill in the art will be described in detail an embodiment that can easily practice the invention. However, if it is determined that in the following description of the detail of the operation principle of a preferred embodiment of the present invention is a detailed description of known functions or constructions may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.
[44]
In addition, the same reference numerals to portions that a similar function and operation throughout the drawings. In the specification, when there is any part connected to the other part, which, as well as if it is directly connected to, placed between the other elements in between, and includes cases that are indirectly connected. Also, it includes a certain component, not excluding the other elements do not have a base material which is particularly opposite, it means that may further contain other components.
[45]
According to the invention in the drawings will be described as in the detailed embodiment.
[46]
[47]
1 shows a vertical cross-sectional view of the pouch-shaped battery case in accordance with one embodiment.
[48]
1, the pouch-shaped battery case 100, an outer cover layer 110, a metal barrier layer 120, and an inner adhesive layer 130, and are sequentially stacked, the outer cover layer 110 and the metal barrier layer (120 ) between, there is an adhesive layer 140 is further included. 1, though not shown, adhesion layer 140 is a metal barrier layer 120, and may also be located between the inner adhesive layer 130, or outer cover layer 110 and the metal barrier layer 120 and between the metal barrier layer ( 120) and can be located both between the inner adhesive layer 130.
[49]
Metal barrier layer 120 is a first metal layer 121, a heat dissipation layer 122 and second metal layer 123 is formed of a stacked structure, the first metal layer and second metal layer is either the same material or made of a different material number, and heat dissipation layer 122 may be formed of the same material or different materials or of the first metal layer 121 or the second metal layer 123.
[50]
Heat radiation layer 122 to also voids formed therein, as shown in the third described, and the internal cavity has an adhesive material (not shown) is filled in a bar, the first metal layer by the adhesive material and the second metal layer while combined with the heat radiating layer, the first metal layer, a heat radiating layer and the second metal layer is a shape such as a member of one unit.
[51]
2 shows a vertical cross-sectional view of the pouch-shaped battery case according to still another embodiment.
[52]
2, the pouch-shaped battery case 200 includes a first outer covering layer 211, a second outer covering layer 212, a metal barrier layer 220, a first internal adhesive layer 231 and the second inner bonding layer ( 232) is formed of a laminated structure sequentially, the second, the adhesion layer 213 located between the outer cover layer 212 and barrier metal layer 220. Between Fig. 2 but not shown, the adhesive layer 213 is a metal barrier layer 220 and the first may be present between the inner adhesive layer 231, or the second outer covering layer 212 and the metal barrier layer 220, and it is possible to position both between the first inner adhesive layer 231 and barrier metal layer 220.
[53]
Compared to the pouch-shaped battery case 100 and the pouch-shaped battery case 200, a pouch-shaped battery case 200, and has a pouch-type battery, except that consisting of the outer cover layer and the second inner bonding layer of the layer structure of the two-layer structure it may be of the same structure as the case 100, a description of the pouch-shaped battery case 100 except for the differences can also be applied to a description of the pouch-shaped battery case 200.
[54]
Figure 3 shows a network structure or a porous structure of a heat radiation layer of a different structure.
[55]
3, the heat radiating layer (a) is composed of a network structure formed of a plurality of feed-through in the plate-like metal plate, the heat dissipation layer (b), (c), (d) is a three-dimensional open-porous structure is a metal It is a structure formed in the heat dissipating layer.
[56]
As the through-hole and a porous structure, the adhesive material filling, it is made of a combination with the metal layers. The adhesive material may be filled at a rate of 50% to 100% based on the total volume of through-hole and a porous pores.
[57]
A heat radiating layer are preferably made of a metal material having given the point of thermal conductivity of aluminum is used in that the metal layer of the desired bar, typically a laminate sheet made of a fine material, the heat dissipating layer is higher than the thermal conductivity of the aluminum thermal conductivity Do.
[58]
In this way, pouch-shaped battery case according to the present invention may be by incorporating a metal barrier layer of a heat-radiating layer structure interposed between the plurality of metal layers, it improves the moldability and heat radiation of the battery case.
[59]
Those of ordinary skill in the art that the present invention it will be possible to perform a variety of applications and modifications within the scope of the invention as disclosed in the accompanying claims.
Industrial Applicability
[60]
As it described above, using a single metal layer pouch-shaped battery case in accordance with the present invention comprises an outer cover layer, a metal barrier layer and an inner adhesive layer, and having the same thickness of the metal barrier layer is a bar consisting of a plurality of metal layers, as compared to the case where the metal layer has a relatively flexible can exhibit excellent moldability and further increased since one having a thickness of thinner.
[61]
Further, by including a heat radiation layer is provided between the plurality of metal layers, as well as be made to coupling between the metal layer as described above, the heat dissipation characteristics can be improved bar, rapidly, so heat can be made before the degradation of the battery cells safety this may provide an improved rechargeable battery.
[62]
[63]

Claims
[Claim 1]A positive electrode and a separator interposed between the negative electrode as the the stacked electrode assembly of a pouch-shaped battery case, the battery case includes an outer coating layer, a metal barrier layer and the inner adhesive layer and said metal barrier layer has a plurality of metal layers pouch-shaped battery case made of a structure between contain the heat radiating layer.
[Claim 2]
The method of claim 1 wherein the metal barrier layer is a pouch-shaped battery case, the first metal layer, a heat radiating layer and the second metal layer are sequentially stacked structure.
[Claim 3]
The method of claim 1, wherein the heat dissipation layer is a pouch-shaped battery that the adhesive material within the cavity as a network structure or a porous structure filled casing.
[Claim 4]
4. The method of claim 3 wherein the adhesive material is polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyethylene isophthalate, polycarbonate, polyester-based resin comprising a copolyester; Polyether-based adhesives; Polyurethane-based adhesives; Epoxy resins; Phenolic resins; Nylon 6, nylon 66, nylon 12; Polyamide based resin; Polyolefin-based resin comprising a polyolefin, acid modified polyolefin, the metal-modified polyolefin; Polyvinyl acetate resin; Cellulose-based adhesives; (Meth) acrylic resin; Polyimide-based resins; Amino resins containing urea resin, melamine resin; Chloroprene rubber, nitrile rubber, styrene-rubber comprising a butadiene rubber; At least one member pouch-shaped battery case is selected from the group consisting of silicone-based resin.
[Claim 5]
The method of claim 1, wherein the heat dissipation layer is a pouch-shaped battery case made of a material having a thermal conductivity equal to or higher thermal conductivity of aluminum to help.
[Claim 6]
The method of claim 5, wherein the heat dissipating layer is made of aluminum (Al), beryllium (Be), copper (Cu), silver (Ag) and gold (Au), the pouch-shaped battery case made of at least one element selected from the group consisting of.
[Claim 7]
The method of claim 2, wherein the first metal layer and second metal layer is a pouch-shaped battery case, which are joined to each other by the heat radiation layer.
[Claim 8]
The method of claim 1, wherein the inner adhesive layer is a pouch-shaped battery case consisting of a first inner adhesive layer and the second inner bonding layer.
[Claim 9]
The method of claim 8, wherein the first comprises the inner adhesive layer is surface-modified poly acidification as a layer which is located adjacent to the metal layer of propylene (Acidified-Polypropylene, PPa), the second inner bonding layer is on the outer side of the first inner adhesive layer a location layer polypropylene (polypropylene, PP) the pouch-shaped battery case made of.
[Claim 10]
The method of claim 1, wherein the outer coating is a pouch-shaped battery case consisting of a first outer cover layer and the second outer covering layer.
[Claim 11]
The method of claim 10 wherein the first outer coating layer is a layer located on the outermost side is made of a polyethylene terephthalate (Polyethylene terephthalate, PET), the second outer coating layer is positioned between the first outer coating layer and the metal layer pouch-shaped battery case made of an oriented nylon layer.
[Claim 12]
The method of claim 1 wherein the metal barrier layer is a pouch-shaped battery case made of a structure which includes a heat radiation layer respectively between the three or more metal layers.
[Claim 13]
The method of claim 1, wherein between the metal barrier layer and the outer coating layer and an adhesive layer is interposed, the metal surface of the barrier layer facing the adhesive layer is acidified surface-modified polypropylene layer is a pouch-shaped battery case, which are combined.
[Claim 14]
Claim 1 to claim 13, wherein the pouch-shaped secondary battery including a pouch-shaped battery case according to any one of Items.