US20160359147A1 - Lithium Secondary Battery and Secondary Battery Sub Module Comprising the Same - Google Patents
Lithium Secondary Battery and Secondary Battery Sub Module Comprising the Same Download PDFInfo
- Publication number
- US20160359147A1 US20160359147A1 US15/171,204 US201615171204A US2016359147A1 US 20160359147 A1 US20160359147 A1 US 20160359147A1 US 201615171204 A US201615171204 A US 201615171204A US 2016359147 A1 US2016359147 A1 US 2016359147A1
- Authority
- US
- United States
- Prior art keywords
- lithium secondary
- secondary battery
- heat radiation
- radiation plate
- secondary batteries
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 95
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 229920003023 plastic Polymers 0.000 claims abstract description 46
- 239000004033 plastic Substances 0.000 claims abstract description 46
- 230000004888 barrier function Effects 0.000 claims abstract description 19
- 239000010410 layer Substances 0.000 claims description 46
- 239000010408 film Substances 0.000 claims description 43
- 230000005855 radiation Effects 0.000 claims description 34
- -1 polyethylene Polymers 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 239000004743 Polypropylene Substances 0.000 claims description 8
- 229920001155 polypropylene Polymers 0.000 claims description 8
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000011247 coating layer Substances 0.000 claims description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 6
- 239000004677 Nylon Substances 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 239000011112 polyethylene naphthalate Substances 0.000 claims description 4
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 4
- 239000010409 thin film Substances 0.000 claims description 4
- 229920012753 Ethylene Ionomers Polymers 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 3
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 229910003481 amorphous carbon Inorganic materials 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 3
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 3
- 239000002105 nanoparticle Substances 0.000 claims description 3
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 239000005033 polyvinylidene chloride Substances 0.000 claims description 3
- 239000005060 rubber Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000035699 permeability Effects 0.000 abstract description 6
- 238000009413 insulation Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 230000007774 longterm Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920000106 Liquid crystal polymer Polymers 0.000 description 1
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 229920001002 functional polymer Polymers 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000011244 liquid electrolyte Substances 0.000 description 1
- 150000002641 lithium Chemical class 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000005518 polymer electrolyte Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Images
Classifications
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- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Definitions
- the present invention relates to a lithium secondary battery and a secondary battery sub module including the same.
- a lithium secondary battery which is rechargeable and lightweight and has high energy and power densities, has been widely used as an energy source for wireless mobile devices.
- a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), a battery electric vehicle (BEV), or the like have been proposed.
- the lithium secondary battery has been drawn as a power source for the alternative vehicles to the internal combustion engine vehicles.
- the lithium secondary battery is classified into a lithium ion battery using a liquid electrolyte and a lithium polymer battery using a polymer electrolyte depending on a type of electrolytic solutions, and is classified into cylindrical, prismatic, and a pouch types depending on a types of an exterior material in which an electrode assembly is housed.
- the pouch type lithium secondary battery has an appearance that is made of a metal layer (foil) and a pouch film formed of multi-layers of a synthetic resin layer coated on upper and lower surfaces of the metal layer, the weight of the pouch type lithium secondary battery may be remarkably reduced than that of the cylindrical lithium secondary battery or the prismatic lithium secondary battery using a metallic can, such that the pouch type lithium secondary battery may be lightweight and may be changed to have various types.
- the formed pouch should be adhered by folding.
- Korean Patent Laid-Open Publication No. 10-2013-0089614 discloses an exterior material forming composition for a secondary battery which includes carbon fibers, ceramics and a solvent, and an exterior material formed by including the same, however, did not suggest an alternative idea to solve the above-described problems.
- Another object of the present invention is to provide a lithium secondary battery having excellent resistance to permeability and long-term durability.
- Another object of the present invention is to provide a lithium secondary battery sub module having a high energy density with a compact shape, and reduced manufacturing costs.
- a lithium secondary battery including: an electrode assembly; a plastic case which houses the electrode assembly and includes a gas barrier layer; and a pouch film cover which seals the plastic case having the electrode assembly housed therein.
- the plastic case may be made of at least one selected from a group consisting of polyethylene, polypropylene, polyethylene terephthalate and polyethylene naphthalate.
- the plastic case may be injection mold.
- the gas barrier layer may include at least one selected from a group consisting of ethylene-vinyl alcohol copolymer; polyvinylidene chloride; polyvinyl alcohol; nylon; polyamide; polyacrylonitrile, linear low-density polyethylene, ethylene-vinyl alcohol copolymer, and ionomer copolymer; a metal film; a coating layer made of at least one selected from a group consisting of silica, alumina, rubber, metal, glass and amorphous carbon; and a film having a coating layer in which layered silicate nano particles are dispersed in a polyvinyl alcohol binder.
- the gas barrier layer may be formed on an inner surface of the plastic case.
- the plastic case may be formed in a plurality of layers, and the gas barrier layer is included in an inner layer of the plastic case.
- the pouch film cover may be a stacked film including an inner resin layer, a metal thin film and an outer resin layer.
- the inner resin layer contacting with the plastic case of the pouch film cover may be made of the same material as the plastic case.
- a lithium secondary battery sub module including: a heat radiation plate; and the lithium secondary batteries according to the present invention, which are respectively disposed on both side of the heat radiation plate, wherein the respective lithium secondary batteries are disposed so that the pouch film covers face the heat radiation plate.
- the lithium secondary battery of the present invention may achieve a battery having a significantly increased thickness to increase the capacity thereof without structural limitation, thereby having a higher energy density than the conventional lithium secondary battery.
- the lithium secondary battery of the present invention has excellent resistance to permeability, such that it is possible to secure durability of the battery.
- the lithium secondary battery of the present invention is made without a pouch forming process, such that it is possible to improve productivity due to a decrease in an occurrence of poor insulation.
- the lithium secondary battery sub module of the present invention may have a high energy density and may be formed in a compact shape, thus having economic advantages due to the reduction of manufacturing costs.
- FIG. 1 is a cross-sectional view schematically illustrating a structure of a conventional pouch type secondary battery
- FIG. 2 is a cross-sectional view schematically illustrating a structure of a lithium secondary battery according to an embodiment of the present invention.
- FIG. 3 is a cross-sectional view schematically illustrating a lithium secondary battery sub module according to an embodiment of the present invention.
- the present invention discloses a lithium secondary battery including: an electrode assembly; a plastic case which houses the electrode assembly and includes a gas barrier layer; and a pouch film cover which seals the plastic case having the electrode assembly housed therein, such that it is possible to achieve a battery having a significantly increased thickness so as to increase the capacity thereof without structural limitation, secure durability of the battery due to having excellent resistance to permeability, and improve productivity due to a decrease in an occurrence of poor insulation.
- the lithium secondary battery sub module including the lithium secondary battery may have a high energy density and may be formed in a compact shape with reduced manufacturing costs.
- FIG. 2 illustrates a lithium secondary battery according to an embodiment of the present invention
- FIG. 3 illustrates a lithium secondary battery sub module according to an embodiment of the present invention.
- the lithium secondary battery 40 of the present invention includes an electrode assembly 30 , a plastic case 20 in which the electrode assembly 30 is contained, and a pouch film cover 10 which seals the plastic case 20 having the electrode assembly 30 housed therein.
- Materials for forming the pouch film cover 10 may be any material generally used for the pouch film in the related art, and types thereof are not particularly limited within a range not departing from the purpose of the present invention.
- the pouch film cover 10 may be formed in a multi-layer structure including, for example, an inner resin layer which plays a role of a sealing material due to having sequential thermal adhesiveness, and is made of polyethylene, polyolefin such as non-stretched polypropylene or polypropylene, etc., or an adhesive layer made of a copolymer thereof; a metal thin film which plays a role of a base film for maintaining a mechanical strength and a barrier layer against moisture and oxygen; and an outer resin layer which functions to protect battery cells from an external impact applied thereto, and is a functional polymer layer such as polyethylene terephthalate and polyethylene naphthalate, nylon, or a liquid crystal polymer resin, etc.
- an inner resin layer which plays a role of a sealing material due to having sequential thermal adhesiveness
- a metal thin film
- the above-described inner resin layer, metal thin film and outer resin layer may be formed in a plurality of layers of two layers or more, respectively, and any configuration known in the related art other than the above-described layers may be applied to the pouch film cover 10 of the present invention, without particular limitation thereof.
- Sealing between the pouch film cover 10 and the plastic case 20 may be performed by thermal fusion bonding in consideration of characteristics of the used material, but it is not particularly limited thereto so long as it is within a range without departing from the purpose of the present invention.
- the inner resin layer contacting with the plastic case 20 for increasing sealing properties therebetween may be made of the same material as the plastic case 20 .
- the plastic case 20 houses the electrode assembly 30 in an inner space of the lithium secondary battery 40 of the present invention, and includes a gas barrier layer.
- a conventional pouch type secondary battery 3 is manufactured by a method including the processes of inserting an electrode assembly 2 into a space formed by pouch film covers 1 , injecting electrolyte therein and sealing the pouch film covers 1 .
- the secondary battery 3 is manufactured by a method of adhering the formed pouch film covers 1 so as to face each other, however there is a structural limitation for increasing a capacity of the battery in unit cells due to the limitation on the forming depth of the pouch film.
- a space capable of containing the electrode assembly 30 is formed by the plastic case 20 including the gas barrier layer, and the electrode assembly 30 is housed in the space, and then the space is covered with the pouch film cover 10 and is sealed by the thermal fusion bonding.
- the lithium secondary battery 40 of the present invention is configured in such a way that the plastic case 20 includes the gas barrier layer, and thereby resistance to permeability may be secured, and an inlet and outlet of a gas between an inside and outside of the battery may be prevented so as to provide long-term durability.
- the secondary battery of the present invention is manufactured without a process of forming the pouch as in the related art, it is possible to improved productivity upon manufacturing due to a decrease in an occurrence of poor insulation.
- Types of the material for forming the plastic case 20 according to the present invention are not particularly limited, but as a particular example, may include at least one selected from a group consisting of polyethylene, polypropylene, polyethylene terephthalate and polyethylene naphthalate, which are preferable in terms of securing the molding workability, sealing properties and insulation properties.
- a processing method of the plastic case 20 is not particularly limited, but an injection molding method is preferably used in an aspect of the form of a battery case.
- the gas barrier layer according to the present invention is not particularly limited, but as a particular example, may include at least one selected from a group consisting of ethylene-vinyl alcohol copolymer; polyvinylidene chloride; polyvinyl alcohol; nylon; polyamide; polyacrylonitrile, linear low-density polyethylene, ethylene-vinyl alcohol copolymer, and ionomer copolymer; a metal film; a coating layer made of at least one selected from a group consisting of silica, alumina, rubber, metal, glass and amorphous carbon; and a film having a coating layer in which layered silicate nano particles are dispersed in a polyvinyl alcohol binder, which are preferable in terms of securing the workability and resistance to permeability.
- the gas barrier layer is formed on an inner surface of the plastic case 20 , and may be located so as to contact with the electrode assembly 30 housed inside the plastic case 20 .
- the gas barrier layer is included as an inner layer of the plastic case 20 .
- the material of the plastic case 20 is polypropylene, it may be a multi-layer structure of polypropylene/gas barrier layer/polypropylene which are sequentially stacked in this order.
- the electrode assembly 30 included in the lithium secondary battery 40 of the present invention is known in the related art, and may have any shape so long as it is within a range not departing from the purpose of the present invention. As a particular example, it may have the same shape as the electrode assembly 30 to be described below, but it is not limited thereto.
- the electrode assembly 30 may have a shape in which a cathode plate, a separator, and an anode plate are disposed in this order to be wound in one direction, or a plurality of cathode plates, separators, and anode plates are stacked.
- Each of the cathode and anode plates may be electrically connected with a cathode tap and an anode tap, and in the cathode and anode plates, one end portion of the respective cathode and anode taps may protrude to an outside through a lead.
- the one end portion of the protruded lead may be connected with an external terminal (not illustrated).
- Outer surfaces of the leads may be wound by an electrode tape, respectively, in order to prevent an electrical short circuit between a body and cover of the case and the leads at a portion contacting with an outer portion.
- the lithium secondary battery 40 according to the present invention may be applied to medium and large size battery modules or battery packs to be used as a unit cell.
- the medium and large size battery modules or battery packs may be used as a power source for medium and large size devices such as one or more of an electric vehicle (EV) including a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV); an electric truck; an electric bus & truck; and an energy storage system.
- EV electric vehicle
- HEV hybrid electric vehicle
- PHEV plug-in hybrid electric vehicle
- an electric truck an electric bus & truck
- an energy storage system an energy storage system
- the medium and large size battery modules are configured in such a way that a plurality of unit cells are connected with each other in a series manner or series/parallel manner to provide a high capacity, which are known in the related art, and therefore will not described in detail in the present disclosure.
- the present invention also provides the lithium secondary battery sub module 60 which includes the lithium secondary batteries of the present invention disposed on both sides of a heat radiation plate 50 , wherein the lithium secondary batteries 40 are disposed so that the pouch film covers 10 face the heat radiation plate 50 .
- the lithium secondary battery sub module 60 of the present invention includes the heat radiation plate 50 between the unit lithium secondary batteries 40 so as to absorb and radiate heat generated inside the battery to the outside.
- the heat radiation plate 50 may be made of aluminum, copper, or the like, but it is not particularly limited thereto.
- the above-described lithium secondary batteries 40 of the present invention are disposed on both sides of the heat radiation plate 50 .
- the lithium secondary batteries 40 are disposed so that the pouch film covers 10 face the heat radiation plate 50 .
- the conventional secondary battery sub module using the pouch type unit lithium secondary battery needs a separate cell cover for protecting the pouch type secondary battery on the outside of the module.
- the lithium secondary battery sub module according to the present invention does not need a separate cell cover, because the plastic cases 20 are disposed on the outside of the module.
- the lithium secondary battery sub module 60 of the present invention has a higher energy density than the conventional secondary battery sub module including the lithium secondary battery, as well as may achieve a compact shape due to excluding a separate cell cover or panel part by a stiffness of the plastic case 20 , and thereby has economic advantages due to the reduction of manufacturing costs.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Composite Materials (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Hybrid Cells (AREA)
- Secondary Cells (AREA)
Priority Applications (1)
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US16/889,841 US11728530B2 (en) | 2015-06-03 | 2020-06-02 | Lithium secondary battery and secondary battery sub module comprising the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR10-2015-0078723 | 2015-06-03 | ||
KR1020150078723A KR102384888B1 (ko) | 2015-06-03 | 2015-06-03 | 리튬 이차 전지 및 이를 포함하는 이차 전지 서브 모듈 |
Related Child Applications (1)
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US16/889,841 Continuation US11728530B2 (en) | 2015-06-03 | 2020-06-02 | Lithium secondary battery and secondary battery sub module comprising the same |
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Publication Number | Publication Date |
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US20160359147A1 true US20160359147A1 (en) | 2016-12-08 |
Family
ID=57452852
Family Applications (2)
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US15/171,204 Abandoned US20160359147A1 (en) | 2015-06-03 | 2016-06-02 | Lithium Secondary Battery and Secondary Battery Sub Module Comprising the Same |
US16/889,841 Active US11728530B2 (en) | 2015-06-03 | 2020-06-02 | Lithium secondary battery and secondary battery sub module comprising the same |
Family Applications After (1)
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US16/889,841 Active US11728530B2 (en) | 2015-06-03 | 2020-06-02 | Lithium secondary battery and secondary battery sub module comprising the same |
Country Status (3)
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US (2) | US20160359147A1 (ko) |
KR (1) | KR102384888B1 (ko) |
CN (2) | CN106252709A (ko) |
Cited By (3)
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---|---|---|---|---|
US11258073B2 (en) | 2017-12-19 | 2022-02-22 | Lg Energy Solution, Ltd. | Electrode assembly and method for manufacturing the same |
US11766848B2 (en) * | 2017-09-06 | 2023-09-26 | Showa Denko Packaging Co., Ltd. | Molding packaging material, power storage device packaging case, and power storage device |
EP4333154A1 (en) * | 2022-09-02 | 2024-03-06 | Murata Manufacturing Co., Ltd. | Battery pack |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106784490B (zh) * | 2017-01-23 | 2023-04-07 | 湖北汽车工业学院 | 一种基于点阵结构的轻量化电池箱 |
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- 2016-06-02 CN CN201610388279.4A patent/CN106252709A/zh active Pending
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Also Published As
Publication number | Publication date |
---|---|
CN111564659A (zh) | 2020-08-21 |
KR20160142679A (ko) | 2016-12-13 |
CN106252709A (zh) | 2016-12-21 |
US20200295312A1 (en) | 2020-09-17 |
CN111564659B (zh) | 2024-08-20 |
KR102384888B1 (ko) | 2022-04-07 |
US11728530B2 (en) | 2023-08-15 |
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