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WO2018080033A1 - Battery module having fixing structure for temperature sensor - Google Patents

Battery module having fixing structure for temperature sensor Download PDF

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Publication number
WO2018080033A1
WO2018080033A1 PCT/KR2017/010554 KR2017010554W WO2018080033A1 WO 2018080033 A1 WO2018080033 A1 WO 2018080033A1 KR 2017010554 W KR2017010554 W KR 2017010554W WO 2018080033 A1 WO2018080033 A1 WO 2018080033A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit board
battery cell
battery
printed circuit
module
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.)
Ceased
Application number
PCT/KR2017/010554
Other languages
French (fr)
Korean (ko)
Inventor
하머쉬미트헬무트
호퍼막시밀리안
코틱어반
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung SDI Co Ltd
Original Assignee
Samsung SDI Co Ltd
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
Priority claimed from EP16195595.0A external-priority patent/EP3316384B1/en
Application filed by Samsung SDI Co Ltd filed Critical Samsung SDI Co Ltd
Priority to US16/342,147 priority Critical patent/US11127990B2/en
Priority to CN201780066245.6A priority patent/CN109891661B/en
Publication of WO2018080033A1 publication Critical patent/WO2018080033A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
    • 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
    • H01M50/284—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with incorporated circuit boards, e.g. printed circuit boards [PCB]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/10—Temperature sensitive devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/10—Temperature sensitive devices
    • H01M2200/105—NTC
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/10—Temperature sensitive devices
    • H01M2200/106—PTC
    • 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
    • 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 comprising a specific arrangement for fixing between a thermosensitive element and a protection circuit module suitable for measuring the temperature of a battery cell.
  • Secondary cells differ from primary cells in that they can be repeatedly charged and discharged, while primary cells provide only an irreversible conversion of chemical energy into electrical energy.
  • Low capacity secondary batteries are used as power sources for small electronic devices such as mobile phones, notebook computers and camcorders, while high capacity secondary batteries are used as power sources for hybrid vehicles and the like.
  • a secondary battery in general, includes an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, a case accommodating the electrode assembly, and an electrode terminal electrically connected to the electrode assembly.
  • the electrolyte is injected into the case to allow the battery to be charged and discharged through the electrochemical reaction of the positive electrode, the negative electrode, and the electrolyte solution.
  • the shape of the case such as cylindrical or rectangular, depends on the purpose of the battery.
  • the secondary battery may be used as a battery module in which a plurality of unit battery cells are connected in series and / or in parallel to provide high density energy required for driving a motor of a hybrid vehicle. That is, the battery module is configured by connecting the electrode terminals of the plurality of battery cells to each other in order to realize the high output power required in the electric vehicle.
  • the battery modules can be configured in a block or modular design.
  • each cell is connected to one common current control structure and cell management system and disposed within the housing as a unit.
  • a plurality of battery cells are connected to submodules and a plurality of submodules are connected to form a module.
  • the battery management function may be implemented at least partially at the module or submodule level, thereby improving compatibility.
  • at least one battery module must be mechanically and electrically integrated, a thermal management system must be provided, and communication with at least one electrical consumer must be established.
  • Thermal management systems usually include a protection circuit module disposed adjacent to the battery cell.
  • the present invention provides a battery module which can solve or reduce at least some of the above disadvantages and can be achieved by a simple manufacturing process using an inexpensive member.
  • At least one battery cell a protective circuit module comprising a rigid printed circuit board and electrically coupled to the battery cell, at least one thermosensitive element provided on a surface of the battery cell and the protective circuit module and the thermosensitive element It provides a battery module including a flexible printed circuit board for electrically connecting the.
  • thermosensitive element even if the relative movement between the battery cell and the protection circuit module caused by an external impact, the function or arrangement position of the thermosensitive element provided on the surface of the battery cell is guaranteed. It provides the battery module. Thus, the manufacturing process should be simple so that the manufacturing cost is kept low. To accomplish this, the thermosensitive element is placed directly on the surface of the battery cell and connected to the protective circuit module using the flexible printed circuit board.
  • the flexible printed circuit is made of a plurality of arranged conductors or the like bonded to a thin insulating film.
  • the flexible circuit requires less manual work in the assembly process and reduces the occurrence of errors in the production process.
  • Flexible circuits have unique features that combine form, fit, and function. Flexible circuitry eliminates the high cost of routing, cladding, and soldering. Errors due to wiring work are eliminated and process costs are reduced.
  • the protective circuit module is not suitable for implementation on the flexible printed circuit board as compared to rigid circuit boards that provide high component density.
  • the battery module of the present invention combines the advantages of rigid and flexible circuits.
  • the rigid printed circuit board comprises a slit
  • the flexible printed circuit board extends from the temperature sensing element through the slit to the upper surface of the rigid printed circuit board, It is coupled with the protective circuit module, which sits on the top surface of the rigid printed circuit board.
  • the connection between the temperature sensor and the protective circuit module is made at the upper surface of the rigid printed circuit board.
  • the flexible printed circuit board passes through a dedicated slit in the rigid printed circuit board without passing the outer edge of the rigid printed circuit board and reaching the top surface. Therefore, through the normal bonding process such as soldering, the flexible printed circuit board and the wiring pattern on the rigid printed circuit board can be easily contacted with each other on the upper side of the battery module.
  • the battery module includes a foam member disposed between the lower surface of the rigid printed circuit board and the thermosensitive element.
  • the foam member may be made of an electrically insulating material made of an elastic polymer.
  • the foam member can be easily disposed at a predetermined position to designate.
  • a flexible printed circuit board provided with the thermosensitive element at one of its ends may be secured by an adhesive to the surface of the battery cell.
  • a foam member is disposed on the thermosensitive element, and when mounting the protective circuit module, the other end of the flexible printed circuit board passes through the slit.
  • the foam member may be formed after the protective circuit module is first mounted by extruding the expandable compound into the gap between the thermosensitive element and the rigid printed circuit board.
  • a conductive adhesive layer is provided between the thermosensitive element and the surface of the battery cell. Accordingly, the position of the thermosensitive element may be fixed to the surface of the battery cell.
  • the flexible printed circuit board may first be soldered to the rigid printed circuit board. One end of the flexible printed circuit board on which the temperature sensing member is disposed is fixed to the rigid printed circuit board by the foam member through the slit. Thereafter, a temperature element is fixed to the foam member. While assembling the rigid printed circuit board on the top surface of the battery cell, the temperature sensing member is pressed against the cell surface. An adhesive disposed between the temperature sensing member and the cell surface can ensure thermal contact. The foam member ensures the pressure necessary for contact while the adhesive is cured.
  • Another aspect of the present invention provides an automobile including the battery module described above.
  • thermosensitive element can be fixed to the surface of the battery cell through a simple structure and method. As a result, an increase in manufacturing cost of the battery module can be prevented.
  • FIG. 1 is a perspective view of a battery module.
  • FIG. 2 is a partial cross-sectional view of a battery cell according to the present invention.
  • FIG. 3 is a partially enlarged cross-sectional perspective view of the battery cell of FIG. 2.
  • thermosensitive element coupled to a rigid printed circuit board through a flexible printed circuit.
  • FIG. 5 is a partial perspective view of a battery module including a thermosensitive element coupled with a rigid printed circuit board through a flexible printed circuit comprising a foam member.
  • Spatial representations such as below, below, below, above, above, and above are for comparing features of one component relative to other components as shown in the figures.
  • the components may have different directions or be arranged in various spaces, and thus the above spatial representations are not necessarily limited by the present invention.
  • expressions such as below and above may include both up and down directions. It should also be construed that the device is arranged in various directions, such as being able to rotate 90 degrees or in another direction.
  • one component or layer When one component or layer is represented as, connected to, or combined on top of another component or layer, it may be directly connected to another component or layer, or at least one other component interposed between the components. There may be elements or layers. In addition, one component or layer may be present only between two other components or layers, or at least one intermediate component or layer may be interposed between the components.
  • a general battery module 100 includes a plurality of battery cells 10 arranged in one direction and a heat exchange member 110 provided to be adjacent to bottom surfaces of the plurality of battery cells 10. It includes. A pair of end plates 18 is provided outside the battery cell 10 to face the wide surface of the battery cell 10, and the connecting plate 19 connects the pair of end plates 18 to each other to form a plurality of end plates 18. Configured to hold the battery cells 10 together.
  • the fastening portions 18a formed at both sides of the battery module 100 are fixed to the support plate 31 through bolts 40.
  • the support plate 31 is part of the housing 30.
  • an elastic member 120 made of rubber or other elastic material may be disposed between the support plate 31 and the heat exchange member 110.
  • each battery cell 10 is a rectangular (or square) cell, and the wide planes of the cells are stacked together to form a battery module.
  • each battery cell 10 includes a battery case configured to receive an electrode assembly and an electrolyte solution.
  • the battery case is sealed by the cap assembly 14.
  • the cap assembly 14 is provided with the positive terminal 11 and the negative terminal 12 and the vent 13 having different polarities.
  • the vent 13, which is a safety means of the battery cell 10 serves as a passage for discharging the gas generated in the battery cell 10 to the outside.
  • the positive and negative terminals 11 and 12 of the neighboring battery cells 10 are electrically connected through the bus bars 15, and the bus bars 15 are fixed by fastening means such as nuts 16. Can be.
  • the battery module 100 may be electrically connected to the plurality of battery cells 10 to be a bundle and used as a power supply device.
  • the battery cell 10 may be a rechargeable secondary battery such as a lithium secondary battery.
  • the battery module 100 may be a 48V battery used in automotive related applications.
  • the battery cell 10 generates a large amount of heat during charging and discharging. The generated heat is accumulated in the battery cell 10 to accelerate the deterioration of the battery cell 10. Therefore, the battery module 100 includes a heat exchange member 110 provided to be adjacent to the bottom surface of the battery cell 10 to cool the battery cell 10.
  • it includes means for detecting the temperature of the battery cell 10 to safely operate the battery module 100.
  • Such temperature detection means comprise a protection circuit module and a temperature sensor (not shown in FIG. 1).
  • FIG. 2 is a partial cross-sectional view of one battery cell 10 of the battery module 100 of FIG. 1.
  • 3 is a schematic cross-sectional view partially enlarged of a region of the battery cell according to FIG. 2, in which temperature measurement is performed on the battery cell 10. 2 and 3, the battery module 100 includes a protection circuit module 130 electrically connected to the battery cell 10. In addition, the protection circuit module 130 is electrically connected to the temperature sensing element 150 through the flexible printed circuit board 140.
  • each battery cell 10 of the battery module 100 is electrically connected to the protection circuit module 130.
  • only one protection circuit module 130 is connected to all battery cells 10 of the battery module 100.
  • two or more separate protection circuit modules may be connected to one battery cell or battery cell assembly.
  • the protection circuit module 130 is placed on the side of the battery cell 10 such that a gap is formed between the surface of the battery cell 10 and the surface of the protection circuit module 130 facing the battery cell 10.
  • the protection circuit module 130 is disposed on the top surface of the battery cell 10 in which the electrode terminals 11 and 12 are disposed.
  • the protection circuit module 130 is electrically connected to the battery cell 10 to control charging and discharging and to prevent the battery cell 10 from being overcharged or discharged.
  • the protection circuit module 130 has a rigid printed circuit board 131 having connection terminals 132a and 132b for connecting the terminals 11 and 12 of the battery cell 10 and the upper surface of the rigid circuit board 131. It includes at least one semiconductor element 133 located in.
  • the semiconductor device 133 may include an integrated circuit configured to compare the measured temperature of the battery cell 10 with a limit value for the allowable battery cell temperature.
  • the circuit board 131 includes a wiring pattern (not shown) formed on the surface.
  • the body of the circuit board 131 may be made of a hard electrically insulating material such as polyimide (PI) or polyethylene (PET).
  • the wiring pattern may be made of an electrically conductive material such as copper (Cu), titanium (Ti), nickel (Ni), or palladium (Pd).
  • connection terminals 132a and 132b may be made by exposing a part of the wiring pattern or may be made by further providing a conductive material such as gold (Au) to the exposed part of the wiring pattern as implemented in the present embodiment.
  • a conductive material such as gold (Au)
  • the semiconductor device 133 applies a signal for controlling the operation of the battery cell 10.
  • the semiconductor device 133 controls charging and discharging through the high current line of the battery cell 10.
  • the semiconductor element 133 applies a signal representing the voltage, current and temperature of the battery cell 10, for example, to prevent excessive charging or discharging.
  • the semiconductor device 133 applies information about the temperature of the battery cell 10 from the temperature sensing element 150 through the flexible printed circuit board 140 and controls the operation of the battery cell 10.
  • the information about the voltage, the current, and the temperature may be transferred to the semiconductor device 133 through the wiring pattern of the circuit board 131.
  • the flexible printed circuit board 140 connects the thermal element 150 provided on the surface of the battery cell 10 and the protection circuit module 130.
  • each of the battery cells 10 of the battery module 100 includes at least one temperature-sensitive element 150 for individually measuring the temperature of each battery cell 10. However, in some applications, it is sufficient to place at least two thermal elements 150 in the battery module 100.
  • the flexible printed circuit board 140 includes a sense line (not shown) for transferring a signal from the connected thermosensitive element 150 to the protection circuit module 130. Accordingly, the protection circuit module 130 may check the temperature value of the corresponding battery cell 10.
  • the flexible printed circuit board 140 extends between the protective circuit module 130 and the temperature sensing element 150. Since the flexible printed circuit board 140 can be easily bent, the connection between the corresponding components is stably maintained even when the battery cell 10 or the protection circuit module 130 moves within the housing 30. More specifically, the flexible printed circuit board 140 extends through the slit 135 in the circuit board 131 and one end of the flexible printed circuit board 140 has a protective circuit on the top surface of the circuit board 131. It is electrically connected to the wiring pattern of the module 130. Accordingly, a connector (not shown) may be provided on the upper surface of the circuit board 131 to contact the sensing line of the flexible printed circuit board 140 through a general soldering process or the like.
  • the temperature sensing element 150 is provided on one surface of the battery cell 10.
  • the temperature sensing element 150 may be a temperature sensor.
  • NTC negative temperature
  • PTC characteristic thermistor
  • the protection circuit module 130 may control the charging and discharging of the battery cell 10.
  • the thermal element 150 is provided in the configuration of a chip thermistor.
  • the chip thermistor is simply connected to the circuit board 131 of the protective circuit module 130 via a flexible printed circuit board 140 by, for example, a solder mounting process, thereby reducing the overall number of processes. Can be reduced. Moreover, this solder mounting process can be automated.
  • the foam member 160 is disposed between the protective circuit module 130 and a portion of the flexible printed circuit board 140 supporting the thermosensitive element 150 to fix the thermosensitive element 150 to the top surface of the battery cell 10. Is provided. Thus, the thermosensitive element 150 is pressed onto the top surface of the battery cell 10 by the foam member 160 inserted between the flexible printed circuit board 140 and the protective circuit module 130. Optionally, the thermal element 150 may be fixed to the top surface of the battery cell 10 including the conductive adhesive layer 170.
  • Foam member 160 may be made of an electrically insulating material.
  • the foam member is preferably made of a polymeric material, such as an elastomer, to attenuate the relative movement between the battery cell 10 and the protective circuit module 130.
  • Materials useful as the foam member include polyurethane and the like.
  • FIG. 4 is a partial perspective view of a battery module 100 including a thermal element 150 that couples with a rigid printed circuit board 131 through a flexible printed circuit board 140.
  • the battery cell 10 and the foam member 160 are not shown in FIG. 4, and the rigid printed circuit board 131 is semitransparently indicated by dotted lines.
  • the flexible printed circuit board 140 extends from the surface facing the battery cell through the slit 135 of the rigid printed circuit board 131 to the surface facing the battery cell.
  • the flexible printed circuit board 140 is coupled with a wiring pattern (not shown) on the upper surface of the rigid printed circuit board 131.
  • FIG. 5 is a partial perspective view of the battery module 100 further showing the foam member 160 in FIG. 4.
  • battery module 135 slit
  • protection circuit module 150 thermal element
  • connection terminal 170 thermally conductive adhesive layer

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Automation & Control Theory (AREA)
  • Battery Mounting, Suspending (AREA)
  • Secondary Cells (AREA)

Abstract

The present invention relates to a battery module. The battery module comprises at least one battery cell and a rigid printed circuit board, and comprises: a protection circuit module electrically coupled with the battery cell; at least one temperature sensor provided on the surface of the battery cell; and a flexible printed circuit board for electrically connecting the protection circuit module and the temperature sensor.

Description

감온 소자를 위한 고정 구조를 갖는 전지 모듈Battery module with fixed structure for thermo sensor

본 발명은 전지 셀의 온도 측정에 적합한 감온 소자와 보호 회로 모듈 사이의 고정을 위한 특정 배열을 포함한 전지 모듈에 관한 것이다.The present invention relates to a battery module comprising a specific arrangement for fixing between a thermosensitive element and a protection circuit module suitable for measuring the temperature of a battery cell.

이차 전지는 반복적으로 충전 및 방전할 수 있다는 점에서 일차 전지와 상이한 반면, 일차 전지는 화학적 에너지의 전기 에너지로의 비가역적인 전환 만을 제공한다. 낮은 용량의 이차 전지는 휴대폰, 노트북 컴퓨터 및 캠코더와 같은 소형 전자 장치용 전원으로서 사용되는 반면, 높은 용량의 이차 전지는 하이브리드 자동차 등의 전원으로 사용된다. Secondary cells differ from primary cells in that they can be repeatedly charged and discharged, while primary cells provide only an irreversible conversion of chemical energy into electrical energy. Low capacity secondary batteries are used as power sources for small electronic devices such as mobile phones, notebook computers and camcorders, while high capacity secondary batteries are used as power sources for hybrid vehicles and the like.

일반적으로, 이차 전지는 양극, 음극, 및 양극과 음극 사이에 개재되는 세퍼레이터를 포함하는 전극 어셈블리, 전극 어셈블리를 수용하는 케이스, 및 전극 어셈블리에 전기적으로 연결되는 전극 단자를 포함한다. 전해액은 양극, 음극 및 전해질 용액의 전기 화학적 반응을 통해 전지의 충전 및 방전을 할 수 있도록 케이스 내에 주입된다. 실린더형, 직사각형 등 케이스의 형태는 전지의 목적에 따라 달라진다. In general, a secondary battery includes an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, a case accommodating the electrode assembly, and an electrode terminal electrically connected to the electrode assembly. The electrolyte is injected into the case to allow the battery to be charged and discharged through the electrochemical reaction of the positive electrode, the negative electrode, and the electrolyte solution. The shape of the case, such as cylindrical or rectangular, depends on the purpose of the battery.

이차 전지는 하이브리드 자동차의 모터 구동 등에 필요한 고밀도 에너지를 제공하기 위하여 직렬 및/또는 병렬로 연결된 다수개의 단위 전지 셀들이 자리한 전지 모듈로서 사용될 수 있다. 즉, 전지 모듈은 전기 자동차 등에서 요구되는 고출력 전원을 실현하기 위하여 다수개의 전지 셀의 전극 단자를 서로 연결하여 구성된다. The secondary battery may be used as a battery module in which a plurality of unit battery cells are connected in series and / or in parallel to provide high density energy required for driving a motor of a hybrid vehicle. That is, the battery module is configured by connecting the electrode terminals of the plurality of battery cells to each other in order to realize the high output power required in the electric vehicle.

전지 모듈들은 블록 또는 모듈 방식의 디자인으로 구성될 수 있다. 블록 방식의 디자인에서 각 전지는 하나의 공통 전류 제어 구조 및 전지 관리 시스템에 연결되어 그 단위로 하우징 내에 배치된다. 모듈 방식의 디자인에서 다수개의 전지 셀은 서브 모듈에 연결되고 다수개의 서브 모듈이 연결되어 모듈을 만든다. 전지 관리 기능은 모듈 또는 서브 모듈 레벨에서 적어도 부분적으로 실현될 수 있는 바, 이에 따라 호환성이 개선될 수 있다. 전지 시스템을 구성하기 위해, 적어도 하나 이상의 전지 모듈이 기계적, 전기적으로 통합되고, 열관리 시스템이 갖춰지고, 적어도 하나 이상의 전기 소비체와의 통신이 마련되어야 한다. 열관리 시스템은 대개 전지 셀과 인접하게 배치되는 보호 회로 모듈을 포함한다. The battery modules can be configured in a block or modular design. In a block design, each cell is connected to one common current control structure and cell management system and disposed within the housing as a unit. In a modular design, a plurality of battery cells are connected to submodules and a plurality of submodules are connected to form a module. The battery management function may be implemented at least partially at the module or submodule level, thereby improving compatibility. In order to construct a battery system, at least one battery module must be mechanically and electrically integrated, a thermal management system must be provided, and communication with at least one electrical consumer must be established. Thermal management systems usually include a protection circuit module disposed adjacent to the battery cell.

전지 시스템에 연결된 다양한 전기 소비체의 동적 전력 수요를 만족하기 위하여, 전지 전원 출력 및 충전의 정적 제어는 충분하지 않다. 따라서, 전지 시스템과 전기 소비체의 제어부 사이에 꾸준한 정보 교환이 필요하다. 이들 정보에는 전지 시스템의 실제 충전 상태(SoC), 잠재적인 전기 성능, 충전 능력 및 내부 저항은 물론 실제 또는 예측된 전력 수요 및 소비체의 잉여분과 같은 중요한 정보가 포함된다. 전지 셀의 온도는 각 전지 셀의 상태를 제어하기 위한 하나의 매개 변수로 정의된다. 따라서, 감온 소자가 전지 모듈 내에 제공된다. 한편, 자동차에서는 특히 강한 외부의 충격이 있을 수 있기 때문에, 감온 소자를 전지 셀 표면에 유지하려는 일부 해결책이 제시되고 있다. 이러한 각 시도는 여러 부품을 사용하여 기계적으로 복잡한 고정 구조를 가져 오고 있어, 제조 및 재료 비용을 높게 함으로써 전지 모듈의 제조 원가를 상승시킨다.In order to meet the dynamic power demands of various electricity consumers connected to the battery system, static control of battery power output and charging is not sufficient. Therefore, a steady exchange of information is needed between the battery system and the control unit of the electricity consumer. These information include important information such as the actual state of charge (SoC), potential electrical performance, charging capability and internal resistance of the battery system as well as actual or predicted power demand and surplus of consumer. The temperature of the battery cells is defined as one parameter for controlling the state of each battery cell. Thus, a thermosensitive element is provided in the battery module. On the other hand, in automobiles there may be particularly strong external impacts, so some solutions have been proposed to keep the temperature sensitive element on the battery cell surface. Each of these attempts has resulted in a mechanically complex fixed structure using multiple components, which increases the manufacturing cost of the battery module by increasing the manufacturing and material costs.

본 발명은 상기한 단점 중 적어도 일부를 해소하거나 줄일 수 있고, 저렴한 부재를 이용하여 간단한 제조 공정에 의해 이루어질 수 있는 전지 모듈을 제공한다. The present invention provides a battery module which can solve or reduce at least some of the above disadvantages and can be achieved by a simple manufacturing process using an inexpensive member.

본 발명에 따르면 종래의 기술이 가지고 있는 적어도 하나 이상의 단점을 극복하거나 줄일 수 있다. 특히, 적어도 하나 이상의 전지 셀, 경질의 인쇄 회로 기판을 포함하며 상기 전지 셀과 전기적으로 결합된 보호 회로 모듈, 상기 전지 셀의 표면에 제공되는 적어도 하나 이상의 감온 소자 및 상기 보호 회로 모듈과 상기 감온 소자를 전기적으로 연결하는 가요성 인쇄 회로 기판을 포함하는 전지 모듈을 제공한다.According to the present invention can overcome or reduce at least one or more disadvantages of the prior art. In particular, at least one battery cell, a protective circuit module comprising a rigid printed circuit board and electrically coupled to the battery cell, at least one thermosensitive element provided on a surface of the battery cell and the protective circuit module and the thermosensitive element It provides a battery module including a flexible printed circuit board for electrically connecting the.

즉, 본 발명의 일 측면에 따르면, 외부 충격에 의해 상기 전지 셀과 상기 보호 회로 모듈 사이의 상대적 이동이 발생할 경우에서도 조차 상기 전지 셀의 표면에 제공되는 상기 감온 소자의 기능 내지 배치 위치가 보장되는 상기 전지 모듈을 제공한다. 이에, 제조 공정은 제조 비용이 낮게 유지되도록 간단하여야 한다. 이를 달성하기 위해, 상기 전지 셀의 표면 위에 상기 감온 소자를 직접 배치하고 상기 가요성 인쇄 회로 기판을 사용하여 상기 보호 회로 모듈에 연결한다.That is, according to one aspect of the present invention, even if the relative movement between the battery cell and the protection circuit module caused by an external impact, the function or arrangement position of the thermosensitive element provided on the surface of the battery cell is guaranteed. It provides the battery module. Thus, the manufacturing process should be simple so that the manufacturing cost is kept low. To accomplish this, the thermosensitive element is placed directly on the surface of the battery cell and connected to the protective circuit module using the flexible printed circuit board.

상기 가요성 인쇄 회로는, 얇은 절연 필름에 결합된 다수개의 배열된 도전체 등으로 만들어진다. 상기 가요성 회로는 조립과정에서 수작업이 덜 필요로 하며, 생산과정에서 오류가 발상하는 것을 감축한다. 가요성 회로는 형태(form), 적합성(fit) 및 기능(function)이 융합된 고유한 특장점을 갖추고 있다. 가요성 회로는 라우팅(routing), 피복, 및 납땜의 고비용을 제거한다. 배선작업에 따른 오류가 제거되며, 공정 비용이 감소된다. 그러나, 상기 보호 회로 모듈은 높은 부품 밀도를 제공하는 경질의 회로 기판에 비해 상기 가요성 인쇄 회로 기판에 구현하기에 적합하지 않다. 따라서, 본 발명의 상기 전지 모듈은 경질 및 가요성 회로의 이점을 결합한다. The flexible printed circuit is made of a plurality of arranged conductors or the like bonded to a thin insulating film. The flexible circuit requires less manual work in the assembly process and reduces the occurrence of errors in the production process. Flexible circuits have unique features that combine form, fit, and function. Flexible circuitry eliminates the high cost of routing, cladding, and soldering. Errors due to wiring work are eliminated and process costs are reduced. However, the protective circuit module is not suitable for implementation on the flexible printed circuit board as compared to rigid circuit boards that provide high component density. Thus, the battery module of the present invention combines the advantages of rigid and flexible circuits.

본 발명의 일 실시예에 따르면, 상기 경질의 인쇄 회로 기판은 슬릿을 포함하고, 상기 가요성 인쇄 회로 기판은 상기 감온 소자로부터 상기 슬릿을 통해 상기 경질의 인쇄 회로 기판의 상부 표면으로 연장되어, 상기 경질의 인쇄 회로 기판의 상부 표면에 자리잡은 상기 보호 회로 모듈과 결합된다. 다시 말해, 온도 센서와 상기 보호 회로 모듈 사이의 연결은 상기 경질의 인쇄 회로 기판의 상부 표면에서 이루어진다. 상기 가요성 인쇄 회로 기판은 상기 경질의 인쇄 회로 기판의 외측 모서리를 지나 상부 표면에 도달하지 않고, 상기 경질의 인쇄 회로 기판 내의 전용 슬릿을 통과한다. 따라서, 납땜과 같은 통상의 접합공정을 통하여 상기 전지 모듈의 상측에 상기 가요성 인쇄 회로 기판과 상기 경질의 인쇄 회로 기판 상의 배선 패턴을 용이하게 서로 접촉할 수 있게 된다.According to one embodiment of the invention, the rigid printed circuit board comprises a slit, the flexible printed circuit board extends from the temperature sensing element through the slit to the upper surface of the rigid printed circuit board, It is coupled with the protective circuit module, which sits on the top surface of the rigid printed circuit board. In other words, the connection between the temperature sensor and the protective circuit module is made at the upper surface of the rigid printed circuit board. The flexible printed circuit board passes through a dedicated slit in the rigid printed circuit board without passing the outer edge of the rigid printed circuit board and reaching the top surface. Therefore, through the normal bonding process such as soldering, the flexible printed circuit board and the wiring pattern on the rigid printed circuit board can be easily contacted with each other on the upper side of the battery module.

본 발명의 다른 일 실시예에 따르면, 상기 전지 모듈은 상기 경질의 인쇄 회로 기판의 하부면과 상기 감온 소자 사이에 배치되는 폼(foam) 부재를 포함한다. 상기 폼 부재는 탄성 고분자로 만들어진 전기 절연성 물질로 제조될 수 있다. 이러한 상기 폼 부재는 지정하는 소정의 위치에 용이하게 배치될 수 있다. 예를 들어, 상기 감온 소자가 그 단부들 중 하나에 제공된 가요성 인쇄 회로 기판은 상기 전지 셀의 표면에 접착제에 의해 고정될 수 있다. 이후, 폼 부재가 상기 감온 소자에 배치되고, 상기 보호 회로 모듈의 장착 시, 상기 가요성 인쇄 회로 기판의 타 단부가 상기 슬릿을 통과한다. 본 발명의 다른 제조 방법에 따르면, 상기 폼 부재는 상기 감온 소자와 상기 경질의 인쇄 회로 기판 사이의 갭 내로 발포성 화합물이 압출되는 것에 의해, 상기 보호 회로 모듈을 먼저 장착한 후에 형성할 수 있다.According to another embodiment of the present invention, the battery module includes a foam member disposed between the lower surface of the rigid printed circuit board and the thermosensitive element. The foam member may be made of an electrically insulating material made of an elastic polymer. The foam member can be easily disposed at a predetermined position to designate. For example, a flexible printed circuit board provided with the thermosensitive element at one of its ends may be secured by an adhesive to the surface of the battery cell. Thereafter, a foam member is disposed on the thermosensitive element, and when mounting the protective circuit module, the other end of the flexible printed circuit board passes through the slit. According to another manufacturing method of the present invention, the foam member may be formed after the protective circuit module is first mounted by extruding the expandable compound into the gap between the thermosensitive element and the rigid printed circuit board.

본 발명의 또 다른 일 실시예에 따르면, 도전성 접착층이 상기 감온 소자와 상기 전지 셀의 표면 사이에 제공된다. 이에 따라, 상기 전지 셀의 표면에 상기 감온 소자의 위치가 고정될 수 있다. 대안적으로, 상기 가요성 인쇄 회로 기판은 먼저 상기 경질의 인쇄 회로 기판에 납땜될 수 있다. 온도 감지 부재가 배치된 상기 가요성 인쇄 회로 기판의 일단은 상기 슬릿을 통과하여 상기 폼 부재에 의해 상기 경질의 인쇄 회로 기판에 고정된다. 이후, 상기 폼 부재에 온도 소자가 고정된다. 상기 전지 셀의 상면에 상기 경질의 인쇄 회로 기판을 조립하는 동안, 온도 감지 부재는 셀 표면에 가압된다. 온도 감지 부재와 셀 표면 사이에 배치된 접착제는 열 접촉을 보장할 수 있다. 접착제가 경화되는 동안 상기 폼 부재는 접촉에 필요한 압력을 보장한다. According to another embodiment of the present invention, a conductive adhesive layer is provided between the thermosensitive element and the surface of the battery cell. Accordingly, the position of the thermosensitive element may be fixed to the surface of the battery cell. Alternatively, the flexible printed circuit board may first be soldered to the rigid printed circuit board. One end of the flexible printed circuit board on which the temperature sensing member is disposed is fixed to the rigid printed circuit board by the foam member through the slit. Thereafter, a temperature element is fixed to the foam member. While assembling the rigid printed circuit board on the top surface of the battery cell, the temperature sensing member is pressed against the cell surface. An adhesive disposed between the temperature sensing member and the cell surface can ensure thermal contact. The foam member ensures the pressure necessary for contact while the adhesive is cured.

본 발명의 다른 측면은, 상기한 전지 모듈의 포함하는 자동차를 제공한다. Another aspect of the present invention provides an automobile including the battery module described above.

본 발명의 추가 측면은 종속 청구항 또는 후술한 설명으로부터 알 수 있다.Further aspects of the invention can be seen from the dependent claims or the description below.

본 발명의 실시예에 따르면, 간단한 구조 및 방법을 통해 감온 소자를 전지 셀의 표면에 고정시킬 수 있다. 이에 따라 전지 모듈의 제조 원가 상승을 방지할 수 있다. According to the embodiment of the present invention, the thermosensitive element can be fixed to the surface of the battery cell through a simple structure and method. As a result, an increase in manufacturing cost of the battery module can be prevented.

이하 첨부된 도면을 참조로 하여 본 발명의 여러 실시예에 대하여 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 설명한다.DETAILED DESCRIPTION Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

도 1은 전지 모듈의 사시도이다. 1 is a perspective view of a battery module.

도 2는 본 발명에 따른 전지 셀의 부분 단면도이다. 2 is a partial cross-sectional view of a battery cell according to the present invention.

도 3은 도 2에 따른 전지 셀을 부분 확대한 단면 사시도이다. 3 is a partially enlarged cross-sectional perspective view of the battery cell of FIG. 2.

도 4는 가요성 인쇄 회로를 통해 경질의 인쇄 회로 기판과 결합하는 감온 소자를 포함한 전지 모듈의 부분 사시도이다. 4 is a partial perspective view of a battery module including a thermosensitive element coupled to a rigid printed circuit board through a flexible printed circuit.

도 5는 폼 부재를 포함하는 가요성 인쇄 회로를 통해 경질의 인쇄 회로 기판과 결합하는 감온 소자를 포함한 전지 모듈의 부분 사시도이다. FIG. 5 is a partial perspective view of a battery module including a thermosensitive element coupled with a rigid printed circuit board through a flexible printed circuit comprising a foam member. FIG.

이하, 본 발명의 기본적인 특징 및 이를 달성하기 위한 방법은 실시예 및 첨부한 도면에 대한 상세한 설명을 참조하면 더욱 쉽게 이해될 수 있다. 도면에서 본 발명을 명확하게 설명하기 위해서 설명과 중복되는 부분은 생략하였으며, 명세서 전체를 통하여 동일 또는 유사한 구성요소에 대해서 같은 참조부호를 붙였다. 본 발명은 여러 가지 다른 형태로 구현될 수 있는바, 따라서 본 발명은 반드시 도시된 실시예에 의해 한정되지 않는다. 오히려 상기 실시예는, 본 발명의 특징과 다양한 측면을 세세하고 완전하게 설명하기 위한 수단이고, 당업자의 충분한 이해를 돕기 위한 예시로서 제공된다. 따라서, 본 발명의 특징에 대한 완전한 이해를 위해 당업자에게 불필요한 설명, 즉 프로세스, 구성요소, 및 기술 설명은 생략될 수 있다. 명세서 전체를 통하여 동일 또는 유사한 구성요소에 대해서 같은 참조 부호를 붙이도록 하는 바, 같은 구성요소에 대해서 중복된 설명은 생략한다. 도면은 여러 가지 구성요소, 층, 및 영역을 명확하게 표현하기 위하여 과장되게 나타낼 수도 있다. Hereinafter, the basic features of the present invention and a method for achieving the same will be more easily understood with reference to the detailed description of the embodiments and the accompanying drawings. In the drawings, redundant parts are omitted to clearly describe the present invention, and like reference numerals designate like elements throughout the specification. The present invention can be embodied in many different forms, and thus the present invention is not necessarily limited to the illustrated embodiments. Rather, the above embodiment is a means for illustrating the details and various aspects of the present invention in detail and completely, and is provided as an example to help a person skilled in the art to fully understand. Thus, unnecessary descriptions, ie processes, components, and technical descriptions, may be omitted for those skilled in the art in order to fully understand the features of the present invention. Since the same reference numerals are assigned to the same or similar components throughout the specification, duplicate descriptions of the same components will be omitted. The drawings may be exaggerated in order to clearly represent various elements, layers, and regions.

아래에, 밑에, 하부에, 위에, 상에, 상부에와 같은 공간적인 표현은 도면에 도시된 바에 따라 일 구성요소의 특징을 다른 구성요소와 상대적으로 비교하기 위한 것이다. 한편, 장치의 사용 또는 작동에 따라 구성요소가 또 다른 방향을 갖거나 다양한 공간에 배치될 수 있으므로, 따라서 상기 공간적 표현은 본 발명이 반드시 도시된 바에 의해 한정되지 않는다. 예를 들어, 도면에 도시된 장치의 방향이 반대로 뒤집힌다면, 아래에, 밑에, 또는 하부에로 기술된 일 구성요소는 다른 구성요소에 대해 상대적으로 위에, 상에, 상부에 에 배향될 것이다. 따라서, 아래 및 위에와 같은 표현은 위와 아래 방향을 모두를 포함할 수 있다. 또한, 상기 장치는 90도나 또 다른 방향으로 회전될 수 있는 등 다양한 방향으로 배치되는 것으로 해석해야 할 것이다. Spatial representations such as below, below, below, above, above, and above are for comparing features of one component relative to other components as shown in the figures. On the other hand, depending on the use or operation of the device, the components may have different directions or be arranged in various spaces, and thus the above spatial representations are not necessarily limited by the present invention. For example, if the orientation of the device shown in the figures is reversed, one component described below, below, or below will be oriented on top, on top, relative to the other components. Thus, expressions such as below and above may include both up and down directions. It should also be construed that the device is arranged in various directions, such as being able to rotate 90 degrees or in another direction.

일 구성요소 또는 레이어가 다른 일 구성요소 또는 레이어의 위에, 연결되어 또는 결합된 것으로 표현할 경우, 이는 다른 일 구성요소 또는 레이어에 직접 연결될 수 있거나, 상기 구성요소 사이에 적어도 하나 이상의 개재된 또 다른 구성요소 또는 레이어가 존재할 수 있다. 또한, 일 구성요소 또는 레이어는 2개의 다른 구성요소 또는 레이어 사이에 유일하게 존재할 수 있는가 하면, 상기 구성요소 사이에 적어도 하나 이상의 중간 구성요소 또는 레이어가 개재되어 포함될 수도 있다. When one component or layer is represented as, connected to, or combined on top of another component or layer, it may be directly connected to another component or layer, or at least one other component interposed between the components. There may be elements or layers. In addition, one component or layer may be present only between two other components or layers, or at least one intermediate component or layer may be interposed between the components.

달리 언급하지 않는 이상, 사용되는 기술 용어 및 과학 용어를 포함한 모든 표현은 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에 의해 일반적으로 이해되는 것과 같은 의미가 있다. 또한, 일반적으로 사용되는 사전적 용어 등은 관련 기술의 맥락을 잇도록 일치하는 의미로 해석되어야 하며, 명시적으로 정의되지 않는 한 이상적이거나 지나치게 형식적인 의미로 해석되어서는 아니 된다. Unless stated otherwise, all expressions, including technical and scientific terms used, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, generally used dictionary terms and the like should be interpreted in a coincidence meaning in the context of the related art, and should not be interpreted in an ideal or overly formal sense unless explicitly defined.

도 1을 참고하면, 일반적인 전지 모듈(100)의 일 실시 형태는, 일 방향으로 정렬된 다수개의 전지 셀(10)과 다수개의 전지 셀(10)의 바닥면과 인접하도록 제공된 열교환 부재(110)를 포함한다. 전지 셀(10) 외부에 한 쌍의 엔드 플레이트(18)가 전지 셀(10)의 넓은 표면과 마주하도록 제공되고, 연결 플레이트(19)는 한 쌍의 엔드 플레이트(18)를 서로 연결하여 다수개의 전지 셀(10)을 함께 고정하도록 구성된다. 전지 모듈(100) 양측에 형성된 체결부(18a)는 볼트(40)를 통하여 지지 플레이트(31)에 고정된다. 지지 플레이트(31)는 하우징(30)의 일부이다. 또한, 고무 또는 다른 탄성 물질로 만들어진 탄성 부재(120)가 지지 플레이트(31)와 열교환 부재(110) 사이에 배치될 수 있다. Referring to FIG. 1, one embodiment of a general battery module 100 includes a plurality of battery cells 10 arranged in one direction and a heat exchange member 110 provided to be adjacent to bottom surfaces of the plurality of battery cells 10. It includes. A pair of end plates 18 is provided outside the battery cell 10 to face the wide surface of the battery cell 10, and the connecting plate 19 connects the pair of end plates 18 to each other to form a plurality of end plates 18. Configured to hold the battery cells 10 together. The fastening portions 18a formed at both sides of the battery module 100 are fixed to the support plate 31 through bolts 40. The support plate 31 is part of the housing 30. In addition, an elastic member 120 made of rubber or other elastic material may be disposed between the support plate 31 and the heat exchange member 110.

여기서 각 전지 셀(10)은 각형(또는 사각형) 셀이고, 셀의 넓은 평면이 함께 적층 되어 전지 모듈을 만든다. 또한, 각 전지 셀(10)은 전극 조립체와 전해액을 수용하도록 구성되는 전지 케이스를 포함한다. 전지 케이스는 캡 조립체(14)에 의해 밀봉된다. 캡 조립체(14)는 서로 다른 극성을 갖는 양극 단자(11)와 음극 단자(12), 및 벤트(13)와 함께 제공된다. 전지 셀(10)의 안전수단인 벤트(13)는 전지 셀(10)에서 생성되는 가스가 외부로 배출되도록 하는 통로 역할을 한다. 서로 이웃하는 전지 셀(10)의 양극 단자(11) 및 음극 단자(12)는 버스바(15)를 통하여 전기적으로 연결되며, 버스바(15)는 너트(16) 등의 체결수단에 의해 고정될 수 있다. 따라서, 전지 모듈(100)은 다수개의 전지 셀(10)을 하나의 묶음이 되도록 전기적으로 연결하여 전원 장치로 사용할 수 있다. 전지 셀(10)은 리튬 이차 전지와 같은 재충전 가능한 이차 전지가 사용될 수 있다. 전지 모듈(100)은 자동차 관련 어플리케이션에 사용되는 48V용 전지 일 수 있다. 일반적으로, 전지 셀(10)은 충전과 방전을 수행하는 동안 많은 양의 열을 발생시킨다. 발생된 열은 전지 셀(10)에 축적되어 전지 셀(10)의 열화를 가속화 시킨다. 따라서, 전지 모듈(100)은 전지 셀(10)을 냉각하기 위하여 전지 셀(10)의 바닥면과 인접하도록 제공되는 열교환 부재(110)를 포함한다. 더욱이, 전지 모듈(100)을 안전하게 동작시키기 위해 전지 셀(10)의 온도를 검출하는 수단을 포함한다. 이런 온도 검출 수단은 보호 회로 모듈 및 온도 센서(도 1에 미도시)를 포함한다.Here, each battery cell 10 is a rectangular (or square) cell, and the wide planes of the cells are stacked together to form a battery module. In addition, each battery cell 10 includes a battery case configured to receive an electrode assembly and an electrolyte solution. The battery case is sealed by the cap assembly 14. The cap assembly 14 is provided with the positive terminal 11 and the negative terminal 12 and the vent 13 having different polarities. The vent 13, which is a safety means of the battery cell 10, serves as a passage for discharging the gas generated in the battery cell 10 to the outside. The positive and negative terminals 11 and 12 of the neighboring battery cells 10 are electrically connected through the bus bars 15, and the bus bars 15 are fixed by fastening means such as nuts 16. Can be. Therefore, the battery module 100 may be electrically connected to the plurality of battery cells 10 to be a bundle and used as a power supply device. The battery cell 10 may be a rechargeable secondary battery such as a lithium secondary battery. The battery module 100 may be a 48V battery used in automotive related applications. In general, the battery cell 10 generates a large amount of heat during charging and discharging. The generated heat is accumulated in the battery cell 10 to accelerate the deterioration of the battery cell 10. Therefore, the battery module 100 includes a heat exchange member 110 provided to be adjacent to the bottom surface of the battery cell 10 to cool the battery cell 10. Furthermore, it includes means for detecting the temperature of the battery cell 10 to safely operate the battery module 100. Such temperature detection means comprise a protection circuit module and a temperature sensor (not shown in FIG. 1).

도 2는 도 1의 전지 모듈(100)의 전지 셀(10) 하나에 대한 부분 단면도이다. 도 3은 도 2에 따른 전지 셀의 일 영역을 부분 확대한 단면 개략도로서, 전지 셀(10)에 대한 온도 측정이 수행된다. 도 2 및 도 3을 참고하면, 전지 모듈(100)은 전지 셀(10)에 전기적으로 연결된 보호 회로 모듈(130)을 포함한다. 또한, 보호 회로 모듈(130)은 가요성 인쇄 회로 기판(140)을 통해 감온 소자(150)와 전기적으로 연결된다. FIG. 2 is a partial cross-sectional view of one battery cell 10 of the battery module 100 of FIG. 1. 3 is a schematic cross-sectional view partially enlarged of a region of the battery cell according to FIG. 2, in which temperature measurement is performed on the battery cell 10. 2 and 3, the battery module 100 includes a protection circuit module 130 electrically connected to the battery cell 10. In addition, the protection circuit module 130 is electrically connected to the temperature sensing element 150 through the flexible printed circuit board 140.

일반적으로, 전지 모듈(100)의 각 전지 셀(10)은 보호 회로 모듈(130)에 전기적으로 연결된다. 본 실시예에 따르면, 단 하나의 보호 회로 모듈(130)이 전지 모듈(100)의 모든 전지 셀(10)에 연결된다. 그러나, 2개 이상의 별개 보호 회로 모듈이 하나의 전지 셀 또는 전지 셀 집합체에 접속될 수도 있다. In general, each battery cell 10 of the battery module 100 is electrically connected to the protection circuit module 130. According to the present embodiment, only one protection circuit module 130 is connected to all battery cells 10 of the battery module 100. However, two or more separate protection circuit modules may be connected to one battery cell or battery cell assembly.

보호 회로 모듈(130)은 전지 셀(10)의 표면과 전지 셀(10)과 마주하는 보호 회로 모듈(130)의 표면 사이에 갭이 형성되도록 전지 셀(10)의 측면에 놓여진다. 본 실시예에서, 보호 회로 모듈(130)은 전극 단자(11, 12)가 배치된 전지 셀(10)의 상면에 배치된다. 특히, 보호 회로 모듈(130)은 전지 셀(10)과 전기적으로 연결되어 충전과 방전을 제어하고 전지 셀(10)이 과하게 충전 또는 방전되는 것을 방지한다. The protection circuit module 130 is placed on the side of the battery cell 10 such that a gap is formed between the surface of the battery cell 10 and the surface of the protection circuit module 130 facing the battery cell 10. In the present embodiment, the protection circuit module 130 is disposed on the top surface of the battery cell 10 in which the electrode terminals 11 and 12 are disposed. In particular, the protection circuit module 130 is electrically connected to the battery cell 10 to control charging and discharging and to prevent the battery cell 10 from being overcharged or discharged.

보호 회로 모듈(130)은 전지 셀(10)의 단자(11, 12)를 연결하기 위한 접속 단자(132a, 132b)를 갖는 경질의 인쇄 회로 기판(131) 및 이 경질의 회로 기판(131) 상면에 자리한 적어도 하나 이상의 반도체 소자(133)를 포함한다. 반도체 소자(133)는 전지 셀(10)의 측정 온도와 허용 전지 셀 온도를 위한 한계 값과 비교하도록 구성된 집적 회로를 포함할 수 있다. 회로 기판(131)은 표면상에 형성된 배선 패턴(미도시)을 포함한다. 회로 기판(131)의 본체는 폴리이미드(PI) 또는 폴리에틸렌(PET)과 같은 경질의 전기 절연성 물질로 만들 수 있다. 배선 패턴은 구리(Cu), 티타늄(Ti), 니켈(Ni) 또는 팔라듐(Pd)과 같은 전기 전도성 물질로 이루어질 수 있다. The protection circuit module 130 has a rigid printed circuit board 131 having connection terminals 132a and 132b for connecting the terminals 11 and 12 of the battery cell 10 and the upper surface of the rigid circuit board 131. It includes at least one semiconductor element 133 located in. The semiconductor device 133 may include an integrated circuit configured to compare the measured temperature of the battery cell 10 with a limit value for the allowable battery cell temperature. The circuit board 131 includes a wiring pattern (not shown) formed on the surface. The body of the circuit board 131 may be made of a hard electrically insulating material such as polyimide (PI) or polyethylene (PET). The wiring pattern may be made of an electrically conductive material such as copper (Cu), titanium (Ti), nickel (Ni), or palladium (Pd).

접속 단자(132a, 132b)는 배선 패턴의 일부를 노출해 만들 수 있거나 본 실시예에서 구현된 바와 같이 배선 패턴의 노출된 부분에 금(Au)과 같은 도전성 물질을 더 제공하여 만들 수 있다.The connection terminals 132a and 132b may be made by exposing a part of the wiring pattern or may be made by further providing a conductive material such as gold (Au) to the exposed part of the wiring pattern as implemented in the present embodiment.

반도체 소자(133)는 전지 셀(10)의 동작을 제어하기 위한 신호를 인가한다. 특히, 반도체 소자(133)는 전지 셀(10)의 고전류 라인을 통해 충전과 방전을 제어한다. 더욱이, 반도체 소자(133)는 전지 셀(10)의 전압, 전류 및 온도를 나타내는 신호를 인가함으로써, 예컨대 과도한 충전 또는 방전을 방지한다.The semiconductor device 133 applies a signal for controlling the operation of the battery cell 10. In particular, the semiconductor device 133 controls charging and discharging through the high current line of the battery cell 10. Further, the semiconductor element 133 applies a signal representing the voltage, current and temperature of the battery cell 10, for example, to prevent excessive charging or discharging.

이를 위해, 반도체 소자(133)는 가요성 인쇄 회로 기판(140)을 통해 감온 소자(150)로부터 전지 셀(10)의 온도에 대한 정보를 인가하고, 전지 셀(10)의 동작을 제어한다. 여기서, 전압, 전류 및 온도에 대한 정보는 회로 기판(131)의 배선 패턴을 통해 반도체 소자(133)로 전달될 수 있다. To this end, the semiconductor device 133 applies information about the temperature of the battery cell 10 from the temperature sensing element 150 through the flexible printed circuit board 140 and controls the operation of the battery cell 10. Here, the information about the voltage, the current, and the temperature may be transferred to the semiconductor device 133 through the wiring pattern of the circuit board 131.

가요성 인쇄 회로 기판(140)은 전지 셀(10)의 표면에 구비된 감온 소자(150)와 보호 회로 모듈(130)을 연결한다. 본 발명의 일 실시예에 따르면, 전지 모듈(100)의 전지 셀(10) 각각은, 각 전지 셀(10)의 온도를 개별적으로 측정하기 위한 적어도 하나 이상의 감온 소자(150)를 포함한다. 하지만, 일부 어플리케이션(application)에서, 전지 모듈(100)에 최소 2개의 감온 소자(150)를 배치하는 것으로도 충분하다.The flexible printed circuit board 140 connects the thermal element 150 provided on the surface of the battery cell 10 and the protection circuit module 130. According to one embodiment of the present invention, each of the battery cells 10 of the battery module 100 includes at least one temperature-sensitive element 150 for individually measuring the temperature of each battery cell 10. However, in some applications, it is sufficient to place at least two thermal elements 150 in the battery module 100.

가요성 인쇄 회로 기판(140)은 연결된 감온 소자(150)로부터 보호 회로 모듈(130)로 신호를 전달하기 위한 감지 라인(미도시)을 포함한다. 이에 따라 보호 회로 모듈(130)은 대응하는 전지 셀(10)의 온도 값을 확인할 수 있다.The flexible printed circuit board 140 includes a sense line (not shown) for transferring a signal from the connected thermosensitive element 150 to the protection circuit module 130. Accordingly, the protection circuit module 130 may check the temperature value of the corresponding battery cell 10.

또한, 가요성 인쇄 회로 기판(140)은 보호 회로 모듈(130)과 감온 소자(150) 사이로 연장된다. 가요성 인쇄 회로 기판(140)은 용이하게 구부러질 수 있으므로, 전지 셀(10) 또는 보호 회로 모듈(130)이 하우징(30) 내에서 이동하더라도 해당 부품 상호 간의 연결은 안정적으로 유지된다. 보다 상세하게는, 가요성 인쇄 회로 기판(140)은 회로 기판(131) 내의 슬릿(135)을 관통하여 연장되며 가요성 인쇄 회로 기판(140)의 일단은 회로 기판(131)의 상면에서 보호 회로 모듈(130)의 배선 패턴과 전기적으로 연결된다. 이에 따라, 회로 기판(131)의 상면에 일반적인 납땜 공정 등을 통해 가요성 인쇄 회로 기판(140)의 감지 라인과 접촉할 수 있는 커넥터(미도시)가 구비된다. In addition, the flexible printed circuit board 140 extends between the protective circuit module 130 and the temperature sensing element 150. Since the flexible printed circuit board 140 can be easily bent, the connection between the corresponding components is stably maintained even when the battery cell 10 or the protection circuit module 130 moves within the housing 30. More specifically, the flexible printed circuit board 140 extends through the slit 135 in the circuit board 131 and one end of the flexible printed circuit board 140 has a protective circuit on the top surface of the circuit board 131. It is electrically connected to the wiring pattern of the module 130. Accordingly, a connector (not shown) may be provided on the upper surface of the circuit board 131 to contact the sensing line of the flexible printed circuit board 140 through a general soldering process or the like.

감온 소자(150)는 전지 셀(10)의 일면에 구비된다. 감온 소자(150)는 온도 센서일 수 있으며, 예를 들어, 부특성(NTC) 서미스터일 경우 전지 셀(10)의 온도가 증가함에 따라 음의 온도 계수로 인해 전기 저항 값이 감소하는 반면, 정특성(PTC) 서미스터일 경우, 전지 셀(10)의 온도가 증가함에 따라 전기 저항 값이 증가한다. 감온 소자(150)는 온도에 민감하게 반응하여 저항 값이 온도를 따라 변하므로, 보호 회로 모듈(130)은 전지 셀(10)의 충전 및 방전을 제어할 수 있다. The temperature sensing element 150 is provided on one surface of the battery cell 10. The temperature sensing element 150 may be a temperature sensor. For example, in the case of a negative temperature (NTC) thermistor, as the temperature of the battery cell 10 increases, the electric resistance value decreases due to the negative temperature coefficient, In the case of the characteristic (PTC) thermistor, the electrical resistance value increases as the temperature of the battery cell 10 increases. Since the thermosensitive element 150 is sensitive to temperature and the resistance value changes with temperature, the protection circuit module 130 may control the charging and discharging of the battery cell 10.

구체적으로, 감온 소자(150)는 칩 서미스터(chip thermistor)의 구성으로 제공된다. 칩 서미스터는 가령, 솔더 실장 공정(solder mounting process)에 의해 가요성 인쇄 회로 기판(140)을 통해 보호 회로 모듈(130)의 회로 기판(131)에 간단히 연결되는 바, 이로 인해 공정 개수를 전반적으로 줄일 수 있다. 더욱이, 이러한 솔더 실장 공정은 자동화가 가능하다.Specifically, the thermal element 150 is provided in the configuration of a chip thermistor. The chip thermistor is simply connected to the circuit board 131 of the protective circuit module 130 via a flexible printed circuit board 140 by, for example, a solder mounting process, thereby reducing the overall number of processes. Can be reduced. Moreover, this solder mounting process can be automated.

전지 셀(10)의 상면에 감온 소자(150)를 고정하기 위해, 보호 회로 모듈(130)과 감온 소자(150)를 지지하는 가요성 인쇄 회로 기판(140)의 일부 사이에 폼 부재(160)가 구비된다. 따라서, 감온 소자(150)는 가요성 인쇄 회로 기판(140)과 보호 회로 모듈(130) 사이에 삽입된 폼 부재(160)에 의해 전지 셀(10)의 상면에 가압된다. 선택적으로, 감온 소자(150)는 도전성 접착층(170)을 포함한 전지 셀(10)의 상면에 고정될 수 있다. The foam member 160 is disposed between the protective circuit module 130 and a portion of the flexible printed circuit board 140 supporting the thermosensitive element 150 to fix the thermosensitive element 150 to the top surface of the battery cell 10. Is provided. Thus, the thermosensitive element 150 is pressed onto the top surface of the battery cell 10 by the foam member 160 inserted between the flexible printed circuit board 140 and the protective circuit module 130. Optionally, the thermal element 150 may be fixed to the top surface of the battery cell 10 including the conductive adhesive layer 170.

폼 부재(160)는 전기 절연 물질로 만들 수 있다. 폼 부재는 전지 셀(10)과 보호 회로 모듈(130) 사이의 상대적인 이동을 감쇠시킬 수 있도록, 엘라스토머와 같은 고분자 물질로 만들어지는 것이 좋다. 폼 부재로서 유용한 물질로는 폴리우레탄 등이 포함된다. Foam member 160 may be made of an electrically insulating material. The foam member is preferably made of a polymeric material, such as an elastomer, to attenuate the relative movement between the battery cell 10 and the protective circuit module 130. Materials useful as the foam member include polyurethane and the like.

도 4는 가요성 인쇄 회로 기판(140)을 통해 경질의 인쇄 회로 기판(131)과 결합하는 감온 소자(150)를 포함한 전지 모듈(100)의 부분 사시도이다. 설명의 편의를 위해, 도 4에 전지 셀(10)과 폼 부재(160)는 도시되어 있지 않으며, 경질의 인쇄 회로 기판(131)은 점선으로 반투명하게 표시한다. 도시된 바와 같이, 가요성 인쇄 회로 기판(140)은 경질의 인쇄 회로 기판(131)의 슬릿(135)을 통해 전지 셀을 향하는 표면에서 전지 셀을 대향하는 표면으로 연장된다. 가요성 인쇄 회로 기판(140)은 경질의 인쇄 회로 기판(131)의 상면에서 배선 패턴(미도시)과 결합된다.4 is a partial perspective view of a battery module 100 including a thermal element 150 that couples with a rigid printed circuit board 131 through a flexible printed circuit board 140. For convenience of description, the battery cell 10 and the foam member 160 are not shown in FIG. 4, and the rigid printed circuit board 131 is semitransparently indicated by dotted lines. As shown, the flexible printed circuit board 140 extends from the surface facing the battery cell through the slit 135 of the rigid printed circuit board 131 to the surface facing the battery cell. The flexible printed circuit board 140 is coupled with a wiring pattern (not shown) on the upper surface of the rigid printed circuit board 131.

도 5는 도 4에 폼 부재(160)가 추가로 도시된 전지 모듈(100)의 부분 사시도이다.FIG. 5 is a partial perspective view of the battery module 100 further showing the foam member 160 in FIG. 4.

이상으로 본 발명에 관한 바람직한 실시예를 설명하였으나, 본 발명은 상기 실시예에 한정되지 아니하며, 본 발명의 실시예로부터 당해 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에 의한 용이하게 변경되어 균등하다고 인정되는 범위의 모든 변경을 포함한다.Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and easily changed and equalized by those skilled in the art to which the present invention pertains. It includes all changes to the extent deemed acceptable.

-부호의 설명-Explanation of sign

10: 전지 셀 133: 반도체 소자10: battery cell 133: semiconductor element

100: 전지 모듈 135: 슬릿100: battery module 135: slit

11, 12: 전극 단자 140: 가요성 인쇄 회로 기판11, 12: electrode terminal 140: flexible printed circuit board

130: 보호 회로 모듈 150: 감온 소자130: protection circuit module 150: thermal element

131: 경질의 인쇄 회로 기판 160: 폼 부재131: rigid printed circuit board 160: foam member

132a, 132b: 접속 단자 170: 열전도성 접착층132a and 132b: connection terminal 170: thermally conductive adhesive layer

Claims (7)

적어도 하나 이상의 전지 셀; At least one battery cell; 경질의 인쇄 회로 기판을 포함하며, 상기 전지 셀과 전기적으로 결합된 보호 회로 모듈; A protection circuit module including a rigid printed circuit board, the protection circuit module electrically coupled with the battery cell; 상기 전지 셀의 표면에 제공된 적어도 하나 이상의 감온 소자; 및 At least one thermosensitive element provided on a surface of the battery cell; And 상기 보호 회로 모듈과 상기 감온 소자를 전기적으로 연결하는 가요성 인쇄 회로 기판Flexible printed circuit board electrically connecting the protection circuit module and the thermosensitive element 을 포함하는 전지 모듈.Battery module comprising a. 제1 항에 있어서, According to claim 1, 상기 경질의 인쇄 회로 기판은 슬릿을 포함하며, The rigid printed circuit board includes slits, 상기 가요성 인쇄 회로 기판은 상기 슬릿을 통해 상기 감온 소자로부터 상기 경질의 인쇄 회로 기판의 상면까지 연장되어 상기 경질의 인쇄 회로 기판의 상면에서 상기 보호 회로 모듈과 결합되는 전지 모듈. And the flexible printed circuit board extends from the thermosensitive element through the slit to an upper surface of the rigid printed circuit board to couple with the protective circuit module on an upper surface of the rigid printed circuit board. 제1 항 또는 제2 항에 있어서, The method according to claim 1 or 2, 상기 경질의 인쇄 회로 기판의 하부면과 상기 감온 소자 사이에 배치된 폼 부재를 포함하는 전지 모듈. And a foam member disposed between the lower surface of the rigid printed circuit board and the thermosensitive element. 제3 항에 있어서, The method of claim 3, wherein 상기 폼 부재는 전기적 절연성 물질로 만들어진 전지 모듈. The foam member is a battery module made of an electrically insulating material. 제3 항에 있어서, The method of claim 3, wherein 상기 폼 부재는 상기 전지 셀의 상면에 상기 감온 소자를 가압하도록 구성되는 전지 모듈. The foam member is configured to press the thermosensitive element on the upper surface of the battery cell. 제1 항 또는 제2 항에 있어서, The method according to claim 1 or 2, 상기 감온 소자와 상기 전지 셀의 표면 사이에 열전도성 접착층이 구비되는 전지 모듈. The battery module is provided with a thermally conductive adhesive layer between the thermosensitive element and the surface of the battery cell. 제1 항 또는 제2 항에 따른 전지 모듈을 포함하는 자동차. An automobile comprising the battery module according to claim 1.
PCT/KR2017/010554 2016-10-25 2017-09-25 Battery module having fixing structure for temperature sensor Ceased WO2018080033A1 (en)

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