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WO2020175881A1 - 전지 모듈 - Google Patents

전지 모듈 Download PDF

Info

Publication number
WO2020175881A1
WO2020175881A1 PCT/KR2020/002681 KR2020002681W WO2020175881A1 WO 2020175881 A1 WO2020175881 A1 WO 2020175881A1 KR 2020002681 W KR2020002681 W KR 2020002681W WO 2020175881 A1 WO2020175881 A1 WO 2020175881A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery module
battery
cell assembly
insulating coating
end plate
Prior art date
Application number
PCT/KR2020/002681
Other languages
English (en)
French (fr)
Inventor
정기택
임상욱
김영길
Original Assignee
주식회사 엘지화학
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to EP20763079.9A priority Critical patent/EP3817090B1/en
Priority to US17/266,793 priority patent/US20210344074A1/en
Priority to JP2021503817A priority patent/JP7102601B2/ja
Priority to CN202080004556.1A priority patent/CN112640191B/zh
Publication of WO2020175881A1 publication Critical patent/WO2020175881A1/ko

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0486—Frames for plates or membranes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/222—Inorganic material
    • H01M50/224—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/227—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/231—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks having a layered structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/258—Modular batteries; Casings provided with means for assembling
    • H01M50/26—Assemblies sealed to each other in a non-detachable manner
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/505—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising a single busbar
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a battery module, and more specifically relates to a battery module including an end plate having insulation performance.
  • secondary batteries have high applicability according to product groups and have electrical characteristics such as high energy density, they are widely applied not only to portable devices, but also to electric vehicles or hybrid vehicles driven by electric drive sources, power storage devices, etc. These secondary batteries are attracting attention as a new energy source for improving eco-friendliness and energy efficiency in that they do not generate any by-products from the use of energy, as well as the primary advantage of being able to drastically reduce the use of fossil fuels.
  • the battery pack applied to the above electric vehicle has a structure in which a plurality of cell assemblies including a plurality of unit cells are connected in series in order to obtain high output.
  • the unit cell includes a positive and negative electrode collector, a separator, and a battery. Repetitive charging and discharging is possible by electrochemical reactions between components including active materials and electrolytes.
  • the present invention is to solve these problems, and by reducing the number of parts in the battery module and reducing the size of the battery module, the energy density is increased, and at the same time, sufficient insulation performance and the rigidity of the battery module can be secured. It is to provide.
  • a battery module includes a battery cell assembly in which a plurality of battery cells are stacked side by side and adjacent to each other, a module frame accommodating the battery cell assembly, and both ends of the battery cell assembly in the longitudinal direction It is located at and includes an end plate that is welded to the module frame, and the end plate includes a body portion including a welding portion welded to the module frame, and an insulating coating portion covering the front of the upper body portion excluding the welded portion. do.
  • the end plate includes an inner surface facing the battery cell assembly and an outer surface located opposite the inner surface, and the insulating coating part may be located on the inner surface and the outer surface.
  • the insulating coating may include at least one selected from epoxy resin, silicon resin, polycarbonate resin, polypropylene resin, acrylonitrile-butadiene-styrene: 88) resin.
  • the thickness of the insulating coating may be 20 ⁇ to 200//111.
  • the thickness of the insulating coating may be 50 ⁇ to 140//111.
  • the body part may be made of a metallic material.
  • the metallic material may include at least one selected from iron, aluminum, magnesium, or alloys thereof.
  • the thickness of the main body may be 1.0111111 to 3.5111111.
  • the end plate may include a terminal opening exposing the bus bar.
  • the insulating coating portion may be formed to surround the terminal opening.
  • the battery module further comprises a bus bar frame in which the bus bar is fixed, and located between the battery cell assembly and an end plate, and the end
  • the plate may be disposed directly adjacent to the bus bar frame. 2020/175881 1»(:1/10 ⁇ 020/002681
  • the insulating coating part may include one or more protrusions protruding from the inner surface toward the battery cell assembly.
  • a battery pack according to another embodiment of the present invention may include at least one battery module as described above, and a pack case for packaging the at least one battery module.
  • a device according to another embodiment of the present invention may include at least one battery pack as described above.
  • FIG. 1 is a perspective view of a battery module according to an embodiment of the present invention.
  • FIG. 2 is a view showing an end plate of a battery module according to an embodiment of the present invention.
  • 3 is a partial cross-sectional view showing a portion of the end plate cut out.
  • 4 is a view as viewed from the front of the battery module according to an embodiment of the present invention.
  • 5 is a partial cross-sectional view showing a portion of an end plate according to another embodiment of the present invention.
  • FIG. 1 is a perspective view of a battery module according to an embodiment of the present invention.
  • the battery module 100 stores a battery cell assembly 110 and a plurality of battery cells 112 are stacked side by side and adjacent to each other, and other than the battery module 100 It includes a module frame 120 forming a tube, and an end plate 200 which is located at both ends of the battery cell assembly 120 in the longitudinal direction and is welded to the module frame 120.
  • the battery cell assembly 110 is a secondary battery including a plurality of battery cells 112
  • the battery cell assembly 110 may include a plurality of battery cells 112, and each battery cell includes an electrode lead 114.
  • the battery cell 112 is a pouch-type battery cell having a plate shape.
  • the electrode lead 114 is a positive electrode lead or a negative electrode lead, and the electrode lead 114 of each battery cell 112 can be bent in one direction, thereby making the battery adjacent to each other.
  • the two electrode leads 114 in contact with each other can be fixed by welding, etc., through which the battery cell 112 inside the battery cell assembly 110 An electrical connection between them can be made.
  • the plurality of battery cells 112 are vertically stacked so that the electrode leads 114 are aligned in one direction to form a battery cell assembly 110.
  • the battery cell assembly 110 is a length of the battery cell assembly 110. It is stored in the module frame 120 having at least one opening open in the direction. At this time, the electrode leads 114 are drawn out of the module frame 120 through the opening, and the electrode leads 114 are drawn out.
  • a bus bar frame 50 may be included that engages the battery cell assembly 110 in the direction.
  • the bus bar 51 may be fixed toward the outside, and the electrode leads 114 of the battery cell assembly 110 pass through the slit formed in the bus bar frame 50 to be electrically connected to the bus bar 51.
  • the bus bar frame 50 may be made of an insulating material, for example a non-conductive synthetic resin, and the bus bar 51 may be made of a conductive metal material.
  • the battery module 100 is a flexible printed circuit board (Flexible Printed Circuit) configured to sense the battery cell 112 by extending and mounting in the longitudinal direction of the module frame 120 on the top of the battery cell assembly 110 Board, FPCB) 40.
  • the battery module 100 can include various electronic components, for example, ICB (Internal Circuit Board) and BMS (Battery Management System). Electronic components such as the BMS board can be electrically connected to the plurality of battery cells.
  • FIG 2 is a view showing the end plate 200 of the battery module 100 according to an embodiment of the present invention
  • Figure 3 is a partial cross-sectional view showing a portion of the end plate 200 cut
  • Figure 4 Is a view as viewed from the front of the battery module 100 according to an embodiment of the present invention.
  • the end plate 200 is coupled to the opening of the module frame 120 while covering the bus bar frame 50 at both ends of the battery cell assembly 110, at this time at the module frame 120 and the welding portion 211 It is welded and fixed.
  • the end plate 200 includes a body part 210 made of a metal material and such
  • an insulating coating part 220 formed by being coated on the front surface of the body part 210.
  • the insulating coating part 220 is coated over the entire body part 0 except for the welding part 211. That is, as shown in FIG. 3, the end plate 200 faces the battery cell assembly 110 and is located on the opposite side of the inner surface 201 as well as the inner surface 201 which is in direct contact with the bus bar frame 50
  • the insulating coating portion 220 is also located in a portion corresponding to the outer surface 202, which is a portion exposed to the outside of the battery module 100.
  • the insulating coating part 220 is an epoxy clock resin, a silicon resin,
  • Acrylonitrile-butadiene-styrene may contain at least one selected from 83 ⁇ 4 resin.
  • the thickness of the insulating coating part 220 (that is, the thickness of the layer coated on the surface of the body part 210) is 20 ⁇ If the thickness of the insulating coating part 220 is less than 20 ⁇ , sufficient insulation performance cannot be obtained, and if it exceeds 200;/111, the thickness becomes too thick and the effect of reducing parts cannot be enjoyed. Not preferred. More preferably, the thickness of the insulating coating portion 220 may be 50 to 140.
  • the body part (0) may be made of a metal material, and may include at least one selected from, for example, iron, aluminum, magnesium or alloys thereof.
  • the thickness of the main body 210 may be 1.0111111 to 3.5111111. If the thickness of the main body 210 is less than 1.0111111, sufficient rigidity to protect the battery module 100 from external shocks, etc. cannot be secured, and if it exceeds 3.5111111 It is not desirable because its weight increases excessively, resulting in an increase in the weight of the entire battery module 100.
  • the end plate 200 includes a terminal opening 230 through which the bus bar 51 fixed to the outside of the bus bar frame 50 is exposed. At this time, it surrounds the terminal opening 230.
  • the insulating coating part 220 is formed so as to ensure sufficient insulation performance between the bus bar 51 and the body part 210 made of metal, and in particular, a sufficient creepage distance can be secured.
  • the creepage distance is , Is a distance that must be secured for insulation, and is a distance along the surface of the insulator between two conductors.
  • the coating part 220 is formed not only in the inner side 201 of the end plate 200 but also in the outer side 202 and the part surrounding the terminal opening 230 Therefore, it is possible to secure a longer creepage distance compared to the conventional technology in which the insulating sheet or coating is placed only inside the end plate 200, and therefore there is no need to unreasonably increase the thickness of the insulating sheet or coating to secure the insulating distance. Design margins can also be improved.
  • a separate insulating cover (or insulating sheet) is provided for insulation between the plates 200.
  • two or more parts are required per battery module 100 compared to the configuration of this embodiment, and additional parts are
  • the thickness of the entire battery module 100 was inevitably increased by the thickness.
  • the above-described by the insulating coating part 220 formed on the inner side 201 and outer side 202 of the end plate 200 can be omitted, and accordingly, the size of the entire battery module 100 can also be reduced, resulting in an increase in energy density.
  • the battery module 100 can be more effectively protected from external shocks, etc. ,Even if the injection material is not exposed, a sufficient insulating distance is secured by the insulating coating part 220 formed on the inner side 201 and outer side 202 of the end plate 200, excluding the part corresponding to the bus bar 51. It is possible to cover the entire front of the battery cell assembly 110 with the end plate 200. At this time, the inside of the end plate 200 is made of a metal material.
  • the end plate 200 further includes an external coupling portion 212 for electrically connecting the battery module 100 with the outside, and in the external coupling portion 212, an insulating coating portion 220 ) Is removed to expose the upper body part 210.
  • an insulating coating portion 220 located around the external coupling part 212. Can be obtained.
  • the insulating coating unit 220 is a battery cell in the inner side 201 of the end plate 200
  • the protrusion 221 may be configured to contact the parts coupled with the battery cell assembly 110 so as to maintain an appropriate distance between the battery cell assembly 110 and the end plate 200. Accordingly, the insulating coating part ( The total thickness of 220) can be made smaller, and the insulation distance between the end plate 200 and the battery cell assembly 110 can be secured by the protrusions 221, more effectively reducing the total weight of the battery module 100 and between parts. Insulation can be secured.
  • the insulating coating part 220 is formed on the entire body part (2W) made of a metal material, and then the insulating coating part 220 is formed in a required part by CNC (computer numerical control) processing.
  • CNC computer numerical control
  • the welded part and the outer coupling part 212 which are the parts from which the insulating coating part 220 is removed, are parts formed for bonding with other components, so precise dimensional control is important. CNC machining enables precise control of the required dimensions.
  • one or more of the battery modules may be packaged in a pack case to form a battery pack.
  • the above-described battery module and battery pack including the same can be applied to various devices.
  • Such devices can be applied to transportation means such as electric bicycles, electric vehicles, and hybrid vehicles, but the present invention is not limited thereto, and It can be applied to a variety of devices that can use the module and the battery pack including it, and this is also within the scope of the rights of the present invention.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Mounting, Suspending (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

본 발명의 한 실시예에 따른 전지 모듈은, 복수의 전지 셀이, 나란하게 서로 인접하여 적층된 전지 셀 조립체, 상기 전지 셀 조립체를 수용하는 모듈 프레임, 상기 전지 셀 조립체의 길이 방향의 양단에 위치하여 상기 모듈 프레임과 용접 결합되는 엔드 플레이트를 포함하고, 상기 엔드 플레이트는 상기 모듈 프레임과 용접 결합되는 용접부를 포함하는 본체부, 및 상기 용접부를 제외한 상기 본체부 전면을 피복하는 절연 코팅부를 포함하는 포함한다.

Description

2020/175881 1»（：1^1{2020/002681 명세서
발명의명칭:전지모듈
기술분야
[1] 과字!츰워（들'）과의상호이용
[2] 본출원은 2019년 2월 26일자한국특허출원제 10-2019-0022기 9호에기초한 우선권의이익을주장하며,해당한국특허출원의문헌에개시된모든내용은 본명세서의일부로서포함된다.
[3] 본발명은전지모듈에관한것으로,보다구체적으로절연성능을갖는엔드 플레이트를포함하는포함하는전지모듈에관한것이다.
배경기술
[4] 이차전지는제품군에따른적용용이성이높고,높은에너지밀도등의전기적 특성을가지기때문에,휴대용기기뿐만아니라전기적구동원에의해구동하는 전기자동차또는하이브리드자동차,전력저장장치등에보편적으로응용되고 있다.이러한이차전지는화석연료의사용을획기적으로감소시킬수있다는 일차적인장점뿐만아니라에너지의사용에따른부산물이전혀발생되지 않는다는점에서친환경및에너지효율성제고를위한새로운에너지원으로 주목받고있다.
[5] 상기전기자동차등에적용되는전지팩은고출력을얻기위해복수의단위 셀을포함하는다수의셀조립체를직렬로연결한구조를가지고있다.그리고 상기단위셀은양극및음극집전체,세퍼레이터,활물질,전해액등을포함하여 구성요소들간의전기화학적반응에의하여반복적인충방전이가능하다.
[6] 한편,근래에너지저장원으로서의활용을비롯하여대용량구조에대한
필요성이높아지면서다수의이차전지가직렬및/또는병렬로연결된다수의 전지모듈을집합시킨멀티모듈구조의전지팩에대한수요가증가하고있다.
[刀 복수개의전지셀을직렬/병렬로연결하여전지팩을구성하는경우,적어도 하나의전지셀로이루어지는전지모듈을먼저구성하고,이러한적어도하나의 전지모듈을이용하여기타구성요소를추가하여전지팩을구성하는방법이 일반적이다.상기전지팩에포함되는전지모듈의개수,또는전지모듈에 포함되는전지셀의개수는요구되는출력전압또는충방전용량에따라 다양하게설정될수있다.
[8] 복수의전지모듈을이용하여전지팩을구성하는경우,높은에너지밀도를 위해서는가능한한하나의전지모듈이차지하는공간의크기를감소시킬 필요가있고,또한안전성을위해서는전지모듈내에서부품들간충분한 절연이확보되어야한다는요구도있다.그러나,절연성능의확보를위하여 절연플레이트등플라스틱재질의부품을추가할경우,해당부품의크기만큼 전지모듈의크기도증가하고,추가되는부품의조립을위한공정상부담도 2020/175881 1»（：1^1{2020/002681 증가하며,반면비교적강성이낮은플라스틱부품의비율이높아져서 전지모듈 전체의 강성 역시낮아질수있다는문제가있다.
발명의상세한설명
기술적과제
[9] 본발명은이러한문제점을해결하기위한것으로,전지모듈내에서부품수를 감소시켜서 전지모듈의크기를감소시키는것에의해 에너지밀도를높이고, 동시에충분한절연성능및전지모듈의 강성도확보할수있는전지모듈을 제공하기 위한것이다.
[ 1이 그러나,본발명의실시예들이해결하고자하는과제는상술한과제에
한정되지 않고본발명에포함된기술적사상의 범위에서다양하게확장될수 있다.
과제해결수단
[11] 본발명의 한실시예에 따른전지모듈은복수의 전지 셀이,나란하게서로 인접하여 적층된전지 셀조립체,상기 전지 셀조립체를수용하는모듈프레임, 상기 전지 셀조립체의길이 방향의 양단에 위치하여상기모듈프레임과용접 결합되는엔드플레이트를포함하고,상기 엔드플레이트는상기모듈프레임과 용접 결합되는용접부를포함하는본체부,및상기용접부를제외한상기본체부 전면을피복하는절연코팅부를포함한다.
[12] 상기 엔드플레이트는,상기 전지 셀조립체와대향하는내면과,상기 내면과 반대측에 위치하는외면을포함하고,상기절연코팅부는상기 내면및상기 외면에 위치할수있다.
[13] 상기절연코팅부는에폭시계수지,실리콘계수지 ,폴리카보네이트 수지 , 폴리프로필렌 수지 ,아크릴로니트릴-부타디엔-스티렌 ：88)수지로부터 선택된적어도하나를포함할수있다.
[14] 상기절연코팅부의두께는 20^내지 200//111일수있다.
[15] 상기절연코팅부의두께는 50^내지 140//111일수있다.
[16] 상기본체부는금속재료로이루어질수있다.
[17] 상기금속재료는철,알루미늄,마그네슘또는이들의 합금으로부터선택되는 적어도하나를포함할수있다.
[18] 상기본체부의두께는 1.0111111내지 3.5111111일수있다.
[19] 상기 전지 셀조립체의 전극리드와전기적으로연결되는버스바를더욱
포함하고,상기 엔드플레이트는상기버스바를노출시키는단자개구를포함할 수있다.
[2이 상기절연코팅부는상기 단자개구를둘러싸도록형성될수있다.
[21] 상기 전지모듈은상기 버스바가고정되고,상기 전지 셀조립체와사이 엔드 플레이트사이에위치하는버스바프레임을더욱포함하고,상기 엔드
플레이트는상기버스바프레임에바로인접하여 배치될수있다. 2020/175881 1»（：1/10公020/002681 상기절연코팅부는상기 내면즉에서상기 전지 셀조립체를향해돌출된하나 이상의돌출부를포함할수있다.
본발명의다른일실시예에따른전지 팩은,상기한적어도하나의 전지모듈, 및상기 적어도하나의 전지모듈을패키징하는팩케이스를포함할수있다. 본발명의다른일실시예에따른디바이스는상기한적어도하나의 전지 팩을 포함할수있다.
발명의효과
[25] 실시예들에따르면,엔드플레이트와전지 셀조립체사이의절연을위하여 구비되는절연커버등이 없이도,충분한절연성능을확보하는동시에 전지 모듈의 에너지밀도상승및전지모듈의 강성 향상을달성할수있는전지 모듈을제공할수있다.
도면의간단한설명
도 1은본발명의 일실시예에 따른전지모듈의사시도이다.
도 2는본발명의 일실시예에 따른전지모듈의 엔드플레이트를도시한 도면이다.
도 3은엔드플레이트의 일부분을잘라서도시한부분단면도이다. 도 4는본발명의 일실시예에 따른전지모듈을정면에서 바라본도면이다. 도 5는본발명의다른실시예에 따른엔드플레이트의 일부분을잘라서도시한 부분단면도이다.
발명의실시를위한형태
이하,첨부한도면을참고로하여본발명의 여러실시예들에 대하여본발명이 속하는기술분야에서통상의지식을가진자가용이하게실시할수있도록 상세히 설명한다.본발명은여러가지상이한형태로구현될수있으며
] ] ] ] ]
790638 · ·234 여기에서 설명하는실시예들에 한정되지 않는다.
2222222333 ·
32] 본발명을명확하게설명하기 위해서설명과관계없는부분은생략하였으며, 명세서 전체를통하여동일또는유사한구성요소에 대해서는동일한참조 부호를붙이도록한다.
또한,도면에서나타난각구성의크기 및두께는설명의 편의를위해 임의로 나타내었으므로,본발명이반드시도시된바에 한정되지 않는다.도면에서 여러 층및영역을명확하게표현하기 위하여두께를확대하여나타내었다.그리고 도면에서,설명의 편의를위해,일부층및 영역의두께를과장되게나타내었다.
34] 또한,층,막,영역,판등의부분이다른부분 "위에’’또는’’상에’’있다고할때, 이는다른부분 "바로위에”있는경우뿐아니라그중간에또다른부분이 있는 경우도포함한다.반대로어떤부분이다른부분 "바로위에”있다고할때에는 중간에다른부분이 없는것을뜻한다.또한,기준이되는부분 "위에”또는 "상에”있다고하는것은기준이되는부분의위또는아래에 위치하는것이고, 반드시중력반대방향을향하여 "위에”또는 "상에”위치하는것을의미하는 것은아니다.
[35] 또한,명세서전체에서,어떤부분이어떤구성요소를 "포함”한다고할때, 이는특별히반대되는기재가없는한다른구성요소를제외하는것이아니라 다른구성요소를더포함할수있는것을의미한다.
[36] 도 1은본발명의일실시예에따른전지모듈의사시도이다.
[37] 도 1을참조하면,본실시예에따른전지모듈 (100)은복수의전지셀 (112)이 나란하게서로인접하여적층된전지셀조립체 (110)와이를수납하며전지 모듈 (100)의외관을형성하는모듈프레임 (120),및상기전지셀조립체 (120)의 길이방향의양단에위치하며,상기모듈프레임 (120)과용접결합되는엔드 플레이트 (200)를포함한다.
[38] 상기전지셀조립체 (110)는복수의전지셀 (112)을포함하는이차전지의
집합체이다.전지셀조립체 (110)는복수의전지셀 (112)을포함할수있고, 각각의전지셀은전극리드 (114)를포함한다.전지셀 (112)은판상형태를갖는 파우치형전지셀일수있으나,이에한정되는것은아니다.상기전극 리드 (114)는양극리드또는음극리드이며,각전지셀 (112)의전극리드 (114)는 단부가한쪽방향으로구부러질수있고,이에의해인접한다른전지셀 (112)이 갖는전극리드의단부와맞닿을수있다.서로맞닿은 2개의전극리드 (114)는 서로용접등을통해고정될수있고,이를통해전지셀조립체 (110)내부의전지 셀 (112)간의전기적연결이이루어질수있다.
[39] 복수의전지셀 (112)은전극리드 (114)들이일측방향으로정렬되도록수직 적층되어전지셀조립체 (110)를이룬다.상기전지셀조립체 (110)는전지셀 조립체 (110)의길이방향으로개방된적어도하나의개구를가지는모듈 프레임 (120)에수납된다.이때,상기전극리드 (114)들은상기개구를통해모듈 프레임 (120)의외측으로인출되고,전극리드 (114)가인출되는방향에서전지셀 조립체 (110)와결합하는버스바프레임 (50)이포함될수있다.버스바
프레임 (50)에는버스바 (51)가외측을향하여고정될수있으며,전지셀 조립체 (110)의전극리드 (114)들은버스바프레임 (50)에형성된슬릿을통과하여 버스바 (51)와전기적으로연결된다.여기서버스바프레임 (50)은절연성소재, 예를들면비전도성합성수지로이루어지고,버스바 (51)는전도성의금속 재료로이루어질수있다.
[4이 또한,전지모듈 (100)은전지셀조립체 (110)의상부에서모듈프레임 (120)의 길이방향으로연장되고장착되어전지셀 (112)을센싱하도록구성된연성인쇄 회로기판 (Flexible Printed Circuit Board, FPCB)(40)을포함한다.아울러전지 모듈 (100)은각종전장부품들을포함할수있으며,일례로 ICB (Internal Circuit Board)및 BMS (Battery Management System)등을포함할수있다.상기 ICB및 BMS보드등의전장부품들은상기복수개의전지셀들과전기적으로연결될 수있다.
[41] 이어서,도 1에더하여도 2내지도 4를참조하여엔드플레이트 (200)의구성에 2020/175881 1»（：1^1{2020/002681 대해상세히설명한다.
[42] 도 2는본발명의일실시예에따른전지모듈 (100)의엔드플레이트 (200)를 도시한도면이고,도 3은엔드플레이트 (200)의일부분을잘라서도시한부분 단면도이며,도 4는본발명의일실시예에따른전지모듈 (100)을정면에서 바라본도면이다.
[43] 엔드플레이트 (200)는전지셀조립체 (110)의양단에서버스바프레임 (50)을 덮으면서모듈프레임 (120)의개구에결합되고,이때모듈프레임 (120)과 용접부 (211)에서용접결합되어고정된다.
[44] 엔드플레이트 (200)는금속재질로이루어진본체부 (210)와이러한
본체부 (210)의전면에피복되어형성되는절연코팅부 (220)를포함한다.이때, 절연코팅부 (220)는상기용접부 (211)를제외한본체부 ( 0)전체에피복된다. 즉,도 3에도시된바와같이,엔드플레이트 (200)가전지셀조립체 (110)와 대향하여버스바프레임 (50)과직접접촉하게되는내면 (201)뿐만아니라, 내면 (201)의반대측에위치하여전지모듈 (100)의외부로노출되는부분인 외면 (202)에대응하는부분에도절연코팅부 (220)가위치한다.
[45] 이러한구성에의하여,엔드플레이트 (200)와전지셀조립체 (110)사이에
추가의절연커버또는절연시트를구비하지않아도,엔드플레이트 (200)내측에 위치하는부품들과엔드플레이트 (200)간의충분한절연을유지할수있다.
[46] 이때，상기절연코팅부 (220)는에폭시계수지 ,실리콘계수지，
폴리카보네이트 0수지，폴리프로필렌 수지，
아크릴로니트릴-부타디엔-스티렌(쇼：8¾수지로부터선택된적어도하나를 포함할수있다.또한절연코팅부 (220)의두께 (즉,본체부 (210)의표면에코팅된 층의두께)는 20^내지 200//111일수있다.절연코팅부 (220)의두께가 20^ 미만이면,충분한절연성능을얻을수없고, 200;/111를초과하면그두께가너무 두꺼워져서부품감소의효과를누릴수없기때문에바람직하지않다.보다 바람직하게상기절연코팅부 (220)의두께는 50 내지 140이일수있다.
[47] 상기본체부 ( 0)는금속재질로이루어질수있고,예를들면철,알루미늄, 마그네슘또는이들의합금으로부터선택되는적어도하나를포함할수있다. 또한본체부 (210)의두께는 1.0111111내지 3.5111111일수있다.본체부 (210)의두께가 1.0111111미만이며 ,전지모듈 (100)을외부의충격등으로부터보호할수있는 충분한강성을확보할수없고, 3.5111111초과이면그중량이지나치게증가하여 전지모듈 (100)전체의중량상승을초래하기때문에바람직하지않다.
[48] 또한상기엔드플레이트 (200)는,버스바프레임 (50)에외측을향하여고정된 버스바 (51)가노출되는단자개구 (230)를포함한다.이때 ,단자개구 (230)를 둘러싸도록절연코팅부 (220)가형성된다.이에의해,버스바 (51)와금속재질의 본체부 (210)사이에충분한절연성능을확보할수있고,특히충분한연면거리를 확보할수있다.여기서연면거리는,절연을위하여확보되어야하는거리로서, 두도체사이의절연체표면에따른거리이다.본실시예의구성에의하면,절연 2020/175881 1»（：1^1{2020/002681 코팅부 (220)가엔드플레이트 (200)의내측 (201)뿐만아니라외측 (202)및단자 개구 (230)를둘러싼부분에모두형성되어있기때문에,단지엔드플레이트 (200) 내측에만절연시트내지코팅을배치한종래기술에비해더욱긴연면거리 확보가가능하고따라서절연거리확보를위해절연시트내지코팅의두께를 무리하게증가시킬필요가없는바,설계마진역시향상될수있다.
[49] 특히,종래에는전지셀조립체 (110)및버스바프레임 (50)과엔드
플레이트 (200)간의절연을위하여별도의절연커버 (또는절연시트)를 구비하였는데,이경우본실시예의구성에비하여하나의전지모듈 (100)당 2개 이상의부품이더필요하고,또한추가되는부품의두께만큼전지모듈 (100) 전체의두께도증가할수밖에없었다.그러나,본실시예에의하면,엔드 플레이트 (200)의내측 (201)및외측 (202)에형성된절연코팅부 (220)에의해 상술한바와같이충분한절연성능의확보가가능하기때문에절연커버 (또는 절연시트)를생략할수있고,이에수반하여전지모듈 (100)전체의크기도 감소하여결과적으로에너지밀도를상승시킬수있다.
[5이 아울러 ,도 4에도시된바와같이，본실시예의구성에의하면버스바 (51)
주위에절연을위한사출물 (예를들면종래의절연커버또는버스바프레임)을 외부로노출시키는양을극단적으로줄일수있기때문에전지모듈 (100)을 외부의충격등으로부터보다효과적으로보호할수있다.즉,사출물이 노출되지않더라도,엔드플레이트 (200)의내측 (201)및외측 (202)에형성된절연 코팅부 (220)에의해충분한절연거리가확보되기때문에버스바 (51)에대응하는 부분을제외한전지셀조립체 (110)의정면전체를엔드플레이트 (200)로덮는 구성이가능하다.이때,엔드플레이트 (200)내측에는금속재질의
본체부 ( 0)가위치하여우수한강성을갖기때문에,이러한엔드
플레이트 (200)에의해덮이는부분을증가시키는것에의해전지모듈 (100)의 강성을증가시킬수있다.
[51] 또한상기엔드플레이트 (200)는,상기전지모듈 (100)을외부와전기적으로 연결하기위한외부결합부 (212)를더욱포함하고,상기외부결합부 (212)에서는 절연코팅부 (220)가제거되어상기본체부 (210)가노출되도록구성된다.이러한 구성에의해,외부와의전기적연결을달성하면서도외부결합부 (212)주위에 위치하는절연코팅부 (220)에의해충분한절연성능을얻을수있다.
[52] 한편,절연코팅부 (220)는엔드플레이트 (200)의내측 (201)에서전지셀
조립체 (110)을향하여돌출된하나이상의돌출부 (221)를포함할수도있다. 돌출부 (221)는전지셀조립체 (110)와결합된부품들과접촉하여전지셀 조립체 (110)와엔드플레이트 (200)간의적절한거리를유지할수있도록구성될 수있다.이에의해,절연코팅부 (220)의전체두께는보다작게하면서, 돌출부 (221)에의해엔드플레이트 (200)와전지셀조립체 (110)간의절연거리를 확보할수있는바,보다효과적으로전지모듈 (100)의전체중량을감소시키면서 부품간절연을확보할수있다. [53] 본실시예의엔드플레이트 (200)는금속재질의본체부 (2W)전체에절연 코팅부 (220)를형성한후, CNC(computer numerical control)가공에의해필요한 부분에서절연코팅부 (220)를제거하는것에의해제조될수있다.특히이때, 절연코팅부 (220)가제거되는부분인용접부및외부결합부 (212)는타구성과의 결합을위해형성되는부분이기때문에정밀한치수제어가중요한데, CNC 가공을통해이와같이필요한치수제어를정밀하게행할수있다.
[54] 이와같이，본발명의일실시예에의하면,엔드플레이트의내면및외면에 형성된절연코팅부를구비하는것에의해,절연을위한추가의부품없이 충분한절연성능의확보가가능하여,전지모듈의크기를감소시키고전지 모듈의강성을향상시킬수있다.
[55] 한편,본발명의실시예에따른전지모듈은하나또는그이상이팩케이스 내에패키징되어전지팩을형성할수있다.
[56] 앞에서설명한전지모듈및이를포함하는전지팩은다양한디바이스에 적용될수있다.이러한디바이스에는,전기자전거,전기자동차,하이브리드 자동차등의운송수단에적용될수있으나,본발명은이에제한되지않고전지 모듈및이를포함하는전지팩을사용할수있는다양한디바이스에적용 가능하며,이또한본발명의권리범위에속한다.
[57] 이상에서본발명의바람직한실시예에대하여상세하게설명하였지만본 발명의권리범위는이에한정되는것은아니고다음의청구범위에서정의하고 있는본발명의기본개념을이용한당업자의여러변형및개량형태또한본 발명의권리범위에속하는것이다.
[58] 부호의설명
[59] 100:전지모듈
[6이 110:전지셀적층체
[61] 200:엔드플레이트
[62] 210:본체부
[63] 220:절연코팅부

Claims

2020/175881 1»（：1/10公020/002681 청구범위
[청구항 1] 복수의전지셀이,나란하게서로인접하여적층된전지셀조립체;
상기전지셀조립체를수용하는모듈프레임;및
상기전지셀조립체의길이방향의양단에위치하여상기모듈프레임과 용접결합되는엔드플레이트
를포함하고,
상기엔드플레이트는상기모듈프레임과용접결합되는용접부를 포함하는본체부,및상기용접부를제외한상기본체부전면을피복하는 절연코팅부를포함하는전지모듈.
[청구항 2] 제 1항에 있어서,
상기엔드플레이트는,상기전지셀조립체와대향하는내면과,상기 내면과반대측에위치하는외면을포함하고,상기절연코팅부는상기 내면및상기외면에위치하는전지모듈.
[청구항 3] 제 1항에 있어서,
상기절연코팅부는에폭시계수지,실리콘계수지,폴리카보네이트 0 수지,폴리프로필렌 수지,아크릴로니트릴-부타디엔-스티렌 ：8¾ 수지로부터선택된적어도하나를포함하는전지모듈.
[청구항 4] 제 1항에 있어서,
상기절연코팅부의두께는 20//111내지 200//111인전지모듈.
[청구항 5] 제 1항에 있어서,
상기절연코팅부의두께는 50내지 140//111인전지모듈.
[청구항 6] 제 1항에 있어서,
상기본체부는금속재료로이루어지는전지모듈.
[청구항 7] 제 6항에 있어서,
상기금속재료는철,알루미늄,마그네슘또는이들의합금으로부터 선택되는적어도하나를포함하는전지모듈.
[청구항 8] 제 1항에 있어서,
상기본체부의두께는 1.0111111내지 3.5_인전지모듈.
[청구항 9] 제 1항에 있어서,
상기전지셀조립체의전극리드와전기적으로연결되는버스바를더욱 포함하고,상기엔드플레이트는상기버스바를노출시키는단자개구를 포함하는전지모듈.
[청구항 10] 제 9항에 있어서 ,
상기절연코팅부는상기단자개구를둘러싸도록형성되는전지모듈.
[청구항 11] 제 9항에 있어서,
상기버스바가고정되고,상기전지셀조립체와사이엔드플레이트 사이에위치하는버스바프레임을더욱포함하고,상기엔드플레이트는 2020/175881 1»（：1^1{2020/002681 상기 버스바프레임에 바로인접하여 배치되는전지모듈.
[청구항 12] 제 1항에 있어서,
상기 엔드플레이트는,상기 전지모듈을외부와전기적으로연결하기 위한외부결합부를더욱포함하고,상기 외부결합부에서는절연 코팅부가제거되어상기본체부가노출되어 있는전지모듈.
[청구항 13] 제 2항에 있어서 ,
상기 절연코팅부는상기내면측에서상기 전지 셀조립체를향해돌출된 하나이상의돌출부를포함하는전지모듈.
[청구항 14] 제 1항내지제 13항중어느한항에 따른적어도하나의 전지모듈;및 상기 적어도하나의 전지모듈을패키징하는팩 케이스
를포함하는전지 팩.
[청구항 15] 제 14항에 따른적어도하나의 전지 팩을포함하는디바이스.
PCT/KR2020/002681 2019-02-26 2020-02-25 전지 모듈 WO2020175881A1 (ko)

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US17/266,793 US20210344074A1 (en) 2019-02-26 2020-02-25 Battery Module
JP2021503817A JP7102601B2 (ja) 2019-02-26 2020-02-25 電池モジュール
CN202080004556.1A CN112640191B (zh) 2019-02-26 2020-02-25 电池模块、电池组及包括该电池组的装置

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KR10-2019-0022719 2019-02-26

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EP4092816A1 (en) * 2021-03-29 2022-11-23 SK On Co., Ltd. Battery module
JP2023524006A (ja) * 2021-01-12 2023-06-08 エルジー エナジー ソリューション リミテッド 偏心部材を含むバッテリーモジュール
JP7540844B2 (ja) 2021-02-26 2024-08-27 エルジー エナジー ソリューション リミテッド 電池モジュールおよびこれを含む電池パック

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KR20200104143A (ko) 2020-09-03
US20210344074A1 (en) 2021-11-04
JP7102601B2 (ja) 2022-07-19
CN112640191A (zh) 2021-04-09
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