WO2012117681A1 - 電池モジュールおよび電池モジュールの製造方法 - Google Patents
電池モジュールおよび電池モジュールの製造方法 Download PDFInfo
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- WO2012117681A1 WO2012117681A1 PCT/JP2012/001033 JP2012001033W WO2012117681A1 WO 2012117681 A1 WO2012117681 A1 WO 2012117681A1 JP 2012001033 W JP2012001033 W JP 2012001033W WO 2012117681 A1 WO2012117681 A1 WO 2012117681A1
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- Prior art keywords
- battery
- batteries
- heat dissipation
- dissipation member
- intervening layer
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- 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
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
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- 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
- H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
-
- 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
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- 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
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- 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
- H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
- H01M10/647—Prismatic or flat cells, e.g. pouch cells
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- 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
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
-
- 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
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6554—Rods or plates
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- 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
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- 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
- H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4935—Heat exchanger or boiler making
Definitions
- the present invention relates to a battery module and a method of manufacturing the battery module.
- the electromotive force of a battery is low, and it is about 4 V in a lithium ion battery which is said to have a high electromotive force. Therefore, when a higher voltage is required, a plurality of batteries are connected in series to be modularized (see Patent Document 1).
- the battery used here is usually a flat rectangular battery, and a battery stack formed by connecting these batteries in series with each other has a rectangular parallelepiped shape.
- a battery module provided with such a battery stack has been housed in a rectangular parallelepiped support formed by assembling a plurality of frames and mounted on a mounting object such as an automobile. With the battery module housed in the support, each side of the rectangular parallelepiped of the battery stack is supported by the frame, and each side of the rectangular parallelepiped is exposed to the outside. The heat generated in the battery stack is dissipated by heat exchange between the battery stack and the outside air in contact with the exposed surface.
- the present invention has been made in view of these problems, and an object thereof is to provide a technique capable of enhancing the heat dissipation efficiency of the battery stack by the heat dissipation member and reducing the possibility of the heat dissipation member colliding with the battery stack. is there.
- the battery module includes a battery stack formed by arranging a plurality of batteries electrically connected to each other, a heat dissipation member extending in a direction in which the plurality of batteries are arranged, and thermally connected to the plurality of batteries, and a battery It is characterized by including an intervening layer disposed between the stack and the heat dissipation member to transfer heat from the battery stack to the heat dissipation member and to suppress relative displacement between the battery stack and the heat dissipation member.
- the heat dissipation efficiency of the battery stack can be enhanced by the heat dissipation member, and the possibility of the heat dissipation member colliding with the battery stack can be reduced.
- a portion of each of the plurality of cells may be embedded in the intervening layer.
- the intervening layer may be interposed between two adjacent cells.
- the intervening layer may adhere the heat dissipating members to each cell of the cell stack.
- the intervening layer is provided on the main surface of the heat dissipation member, and is laminated on the sheet material for preventing penetration of the plurality of batteries, and on the main surface of the sheet material. And an adhesive layer in which a portion of the adhesive is embedded.
- each of the plurality of batteries has a terminal formation surface and a bottom surface facing the terminal formation surface, and at least a portion of the plurality of batteries has a length from the terminal formation surface to the bottom surface
- the external terminals of adjacent cells in a plurality of cells are connected to each other by the terminal connection member, and the terminals forming surfaces may be located on substantially the same plane with respect to the cells connected by the common terminal connection member.
- the plurality of batteries are arranged with the separator interposed therebetween, and the battery stack includes the bottom surface of the separator and the opposing side surfaces of the two batteries sandwiching the separator on the bottom surface on which the heat dissipation member is disposed. And a portion of the intervening layer may be filled in the recess.
- One embodiment of the present invention is a method of manufacturing a battery module.
- the manufacturing method of the said battery module has a process of arranging a several battery so that a terminal formation surface may be located on the substantially same plane, fixing a terminal connection member to the external terminal of a several battery, and having a several battery Separately from the steps of forming the cell stack, arranging the plurality of cells, and forming the cell stack, laminating an intervening layer on the surface of the heat dissipation member on the side on which the cell stack is mounted; And pressing the bottom surface opposite to the side to which the terminal connection member is fixed to the intervening layer to embed a part of each of the plurality of batteries in the intervening layer.
- the method may further include the step of curing the intervening layer to fix the heat dissipation member and the battery stack.
- the heat dissipation efficiency of the battery stack can be enhanced by the heat dissipation member, and the possibility of collision between the heat dissipation member and the battery stack can be reduced.
- FIG. 1 is a perspective view showing a schematic structure of a battery module according to Embodiment 1.
- FIG. 2 is a cross-sectional view taken along a plane passing the line AA in FIG. It is sectional drawing which shows the schematic structure of a battery.
- FIGS. 4A to 4C are process diagrams for explaining the method for manufacturing the battery module according to the first embodiment.
- FIG. 5A and FIG. 5B are process diagrams for explaining the method of manufacturing the battery module according to the first embodiment.
- 6 (A) and 6 (B) are process drawings for explaining the method of manufacturing the battery module according to the first embodiment.
- FIG. 6 is a cross-sectional view showing a schematic structure of a battery module according to Embodiment 2.
- FIG. 8A is a perspective view showing a schematic structure of a heat dissipation member according to a modification.
- FIG. 8B is a cross-sectional view taken along a plane passing through the line B-B in FIG. 8A.
- FIG. 1 is a perspective view showing a schematic structure of the battery module according to the first embodiment.
- FIG. 2 is a cross-sectional view along a plane passing through the line AA in FIG.
- illustration of the case inside of a battery and a fastener is abbreviate
- the battery module 10 includes a battery stack 20, a heat dissipation member 70, and an intervening layer 80.
- the battery stack 20 has a structure in which a plurality of batteries 30 are electrically connected to each other by the bus bars 40 (terminal connection members). In the present embodiment, a total of four batteries 30 are connected in series to form the battery stack 20.
- Each of the four batteries 30 is a flat rectangular battery, and has predetermined intervals such that the sides in the longitudinal direction of the batteries 30 face each other and become substantially parallel in plan view (viewed from the arrow Z direction in FIG. 1) It is arranged by.
- Each battery 30 is arrange
- the positive electrode terminal 50 is provided on one end of the terminal formation surface 33a near one end in the longitudinal direction, and the negative electrode terminal 60 is provided on the other end.
- the positive electrode terminal 50 and the negative electrode terminal 60 are collectively referred to as an external terminal.
- the positive electrode terminal 50 and the negative electrode terminal 60 of the adjacent batteries 30 are arranged to be opposite to each other.
- the bus bar 40 is a belt-like metal plate.
- the bus bar 40 is mounted on the external terminal, and the boundary between the region where the external terminal and the bus bar 40 overlap and the region where the external terminal is exposed is welded by a welding method such as laser welding to fix the external terminal. It is done.
- the connection between the bus bar 40 and the external terminal may be screwing or the like.
- the positive electrode terminal 50 'serving as one end of the series connection of the batteries 30 and the negative electrode terminal 60' serving as the other end of the battery 30 are connected to an external load (not shown) through a wire routed around the outside of the battery module 10. It is possible to connect.
- the number of batteries 30 is not particularly limited. Also, the plurality of batteries may be connected in parallel to one another, or may be connected in series and in parallel.
- the plurality of batteries 30 are arranged with the plate-like separator 22 having insulation properties interposed therebetween.
- the batteries 30 and the separators 22 aligned with their major surfaces facing each other are constrained by a pair of end plates 24 and fasteners 26 to form a battery stack 20.
- the pair of end plates 24 is disposed adjacent to the outermost battery 30 via the separator 22.
- the end plate 24 is a metal plate made of, for example, aluminum or the like, and is insulated from the battery 30 by being adjacent to the battery 30 via the separator 22.
- a screw hole (not shown) in which a connection screw 28 described later is screwed is provided at a predetermined position.
- the fastener 26 is formed of a strip-shaped metal plate, and both ends thereof are bent at a right angle to form a bent portion.
- the bent portion is provided with a through hole (not shown) through which a connection screw 28 described later is inserted.
- the fasteners 26 are arranged to extend in the direction in which the plurality of cells 30 are aligned, and are attached to both sides of the assembly of the cells 30 and the separators 22. In the present embodiment, two fasteners 26 are attached to each side surface.
- the bent portions provided at both ends of the fastener 26 are disposed on the main surfaces of the pair of end plates 24. Further, the fasteners 26 are aligned with the end plate 24 such that the screw holes formed on the main surface of the end plate 24 and the through holes formed in the bent portion are coaxially positioned.
- the connecting screw 28 is inserted into the through hole formed in the bent portion of the fastener 26 and screwed into the screw hole formed in the end plate 24.
- the assembly of the plurality of batteries 30 and the separators 22 is tightened in the direction in which the batteries 30 are arranged by the end plate 24 and the fasteners 26.
- FIG. 3 is a cross-sectional view showing a schematic structure of the battery.
- an electrode body 32 formed by spirally winding positive and negative electrodes in an outer can (housing) 31 is accommodated transversely to the can axial direction of the outer can 31.
- the opening of the outer can 31 is sealed by a sealing plate 33 which constitutes a part of the housing.
- the sealing plate 33 is provided with a positive electrode terminal 50 and a negative electrode terminal 60 each having a flat plate 50a, 60a and a projection 50b, 60b protruding from one of the main surfaces of the flat plate 50a, 60a.
- a gas discharge valve (not shown) is formed in the sealing plate 33.
- the sealing plate 33 constitutes a terminal formation surface 33 a, and the surface facing the terminal formation surface 33 a of the outer can 31 constitutes a bottom surface 31 a of the battery 30.
- the protrusion 50 b of the positive electrode terminal 50 is fitted in the positive electrode opening 33 b of the sealing plate 33 with the gasket 34 in contact with the side surface. Further, the protrusion 50 b is connected to the positive electrode tab member 53 inside the battery of the sealing plate 33.
- the recessed part 51 in which a side wall is formed along the opening 33b for positive electrodes is provided in the front-end
- the positive electrode terminal 50 is fixed to the positive electrode tab member 53 by caulking so that the edge portion of the recess 51 is expanded.
- An insulating plate 35 is provided between the positive electrode tab member 53 and the battery inner side surface of the sealing plate 33. In the positive electrode opening 33b, the insulating plate 35 and the gasket 34 are in contact with each other. Thereby, the positive electrode tab member 53 and the positive electrode terminal 50 are insulated from the sealing plate 33.
- the positive electrode tab member 53 is connected to the positive electrode current collector plate group 32 a protruding from one end face of the electrode body 32.
- the positive electrode current collector group 32 a is obtained by bundling a plurality of positive electrode current collectors projecting from one end face of the electrode body 32.
- the protrusion 60 b of the negative electrode terminal 60 is fitted into the negative electrode opening 33 c of the sealing plate 33 in a state where the gasket 34 is in contact with the side surface.
- the projection 60 b is connected to the negative electrode tab member 62 inside the battery of the sealing plate 33.
- a recess 61 is provided at the tip of the protrusion 60b such that a side wall is formed along the negative electrode opening 33c.
- the negative electrode terminal 60 is fixed to the negative electrode tab member 62 by caulking so that the edge portion of the concave portion 61 is expanded.
- An insulating plate 35 is provided between the negative electrode tab member 62 and the battery inner side surface of the sealing plate 33. In the negative electrode opening 33c, the insulating plate 35 and the gasket 34 are in contact with each other. Thereby, the negative electrode tab member 62 and the negative electrode terminal 60 are insulated from the sealing plate 33.
- the negative electrode tab member 62 is connected to the negative electrode current collector plate group 32 b protruding from the other end face of the electrode body 32.
- the negative electrode current collector group 32b is obtained by bundling a plurality of negative electrode current collectors protruding from the other end face of the electrode body 32.
- Flat portions 50 a and 60 a are arranged such that their main surfaces are along the surface of sealing plate 33.
- the main surface of the flat plate portions 50 a and 60 a on the side where the protrusions 50 b and 60 b protrude is in contact with the surface of the sealing plate 33.
- the heat dissipation member 70 is disposed on the bottom side of the battery stack 20 and extends in the direction in which the plurality of batteries 30 are arranged.
- the heat dissipation member 70 is made of, for example, a metal plate such as aluminum or copper excellent in thermal conductivity, and is thermally connected to each battery 30 of the battery stack 20 via an intervening layer 80 described later.
- the intervening layer 80 is disposed between the battery stack 20 and the heat dissipation member 70, and bonds each battery 30 of the battery stack 20 to the heat dissipation member 70.
- the intervening layer 80 is made of, for example, a room temperature curing type adhesive containing an epoxy resin, and the battery 30 and the heat dissipation member 70 are fixed by adhering to each battery 30 and the heat dissipation member 70 of the battery stack 20 by itself. .
- an acrylic resin, a silicone resin, etc. can be mentioned.
- the intervening layer 80 may have elasticity after curing. In this case, it can be reduced or avoided that the vibration of the heat dissipation member 70 is transmitted to each battery 30.
- the relative displacement of the battery stack 20 and the heat dissipation member 70 can be suppressed. Thereby, the possibility of the battery stack 20 and the heat dissipation member 70 colliding can be reduced. Further, by suppressing the relative displacement between the battery stack 20 and the heat dissipation member 70, deterioration due to friction of each part of the battery module 10 can be reduced.
- the intervening layer 80 is formed of a material having thermal conductivity, and can transfer the heat from the battery stack 20 to the heat dissipation member 70.
- the battery 30 often does not have the same size due to a manufacturing error or the like. Therefore, at least some of the plurality of batteries 30 included in the battery stack 20 have different lengths from the terminal formation surface 33 a to the bottom surface 31 a with respect to the other batteries 30. The maximum difference of the lengths is, for example, about 0.3 mm.
- the external terminals of the adjacent batteries 30 are connected by the plate-like bus bar 40, so that the battery 30 connected by the common bus bar 40 has the terminal formation surface 33a substantially on the same plane. It is located in the present embodiment, the terminal formation surfaces 33a of all the batteries 30 are located on substantially the same plane.
- the phrase “located on substantially the same plane” means not only being completely located on the same plane, but also being located within a range in which the effects of the present invention can be achieved even if they are out of the same plane. Do.
- the batteries 30 has the bottom surface 31 a offset from the other batteries 30. That is, the distance from the bottom surface 31 a to the top surface of the heat dissipation member 70 is different. Therefore, in the bottom surface of the battery stack 20, the unevenness due to the difference in length from the terminal formation surface 33a of each battery 30 to the bottom surface 31a is formed.
- the heat dissipation member 70 is in direct contact with such a battery stack 20, it is difficult to cause all the batteries 30 to abut the heat dissipation member 70 because the bottom of the battery stack 20 has unevenness.
- the heat dissipation efficiency of the battery 30 is reduced, and local heat concentration occurs in the battery stack 20.
- the battery module 10 according to the present embodiment, a part of each battery 30 of the battery stack 20 is embedded in the intervening layer 80. That is, the unevenness due to the difference in length from the terminal formation surface 33 a to the bottom surface 31 a of each battery 30 is absorbed by the intervening layer 80. Therefore, all the batteries 30 can be thermally connected to the heat dissipation member 70 via the intervening layer 80. As a result, the occurrence of local heat concentration in the battery stack 20 can be avoided.
- the separator 22 is set such that the length from the top surface to the bottom surface facing the top surface is shorter than the length in the battery 30 in which the length from the terminal formation surface 33a to the bottom surface 31a is the shortest. Then, on the bottom of the battery stack 20 on the side where the heat dissipation member 70 is disposed, a recess 23 formed by the bottom of the separator 22 and the opposite side surfaces of the two batteries 30 sandwiching the separator 22 is formed.
- a portion of the intervening layer 80 is filled in the recess 23 formed in the bottom surface of the battery stack 20. Therefore, a part of the intervening layer 80 is interposed between two adjacent cells 30. As a result, the relative displacement between the two adjacent batteries 30 is suppressed, so that the strength of the battery stack 20 can be enhanced, and hence the strength of the battery module 10 can be enhanced.
- the intervening layer 80 is filled in the recess 23
- the space in the recess 23 is filled with a part of the intervening layer 80. Therefore, condensation and the like that may occur in the space formed in the recess 23 when the intervening layer 80 is not filled in the recess 23 can be avoided.
- a recess is also formed by the main surface of battery 30 arranged on the outer side of battery stack 20, the main surface of end plate 24, and the bottom surface of separator 22 sandwiched therebetween. A portion of layer 80 is filled. Therefore, the relative displacement between the battery 30 and the end plate 24 is also suppressed by the intervening layer 80.
- the intervening layer 80 has electrical insulation. Therefore, the insulation between the battery stack 20 and the heat dissipation member 70 can be secured. Further, since the intervening layer 80 has electrical insulation, a metal material excellent in thermal conductivity can be adopted for the heat dissipation member 70.
- the battery module 10 having the above-described configuration can be manufactured, for example, as follows.
- 4 (A) to 6 (B) are process diagrams for explaining the method of manufacturing the battery module according to the first embodiment.
- each battery 30 and the five separators 22 are arranged at predetermined intervals such that their longitudinal directions are substantially parallel in plan view.
- the four batteries 30 and the five separators 22 are alternately arranged.
- each battery 30 is aligned so that each terminal formation surface 33a may be located on the substantially same plane.
- the separators 22 are aligned so that the upper surfaces of the separators 22 are positioned substantially on the same plane as the terminal formation surface 33 a of the battery 30.
- the four batteries 30 and the five separators 22 are supported such that the terminal formation surface 33a and the upper surface are in contact with the pedestal, whereby the terminal formation surface 33a and the upper surface are disposed substantially on the same plane.
- an assembly formed by alternately arranging four batteries 30 and five separators 22 is sandwiched by a pair of end plates 24. Then, the fasteners 26 are attached to both sides of the assembly, and the connection screw 28 is screwed. As a result, the assembly of the battery 30 and the separator 22 is tightened in the direction in which the battery 30 and the separator 22 are aligned.
- the bus bar 40 is disposed on the external terminal of the battery 30. Specifically, the main surfaces of one end side of each bus bar 40 are in contact with one negative electrode terminal 60 of two adjacent batteries 30, and the other main surface is in contact with the other positive electrode terminal 50. Will be placed. Then, the bus bar 40 is welded and fixed to the external terminal of each battery 30, and the battery stack 20 having four batteries 30 is formed.
- the step of stacking the intervening layer 80 on the main surface of the heat dissipation member 70 is performed. Specifically, as shown in FIG. 5A, the heat dissipation member 70 is prepared. Then, as shown in FIG. 5 (B), an intervening layer 80 is formed on the surface of the heat dissipation member 70 on the side where the battery stack 20 is mounted by a conventionally known method. For example, the intervening layer 80 is formed by sticking a sheet-like adhesive on the main surface of the heat dissipation member 70. Alternatively, the intervening layer 80 is formed by applying an adhesive to the main surface of the heat dissipation member 70 using a squeegee or the like.
- the bottom surface of the battery stack 20 opposite to the side where the bus bar 40 is fixed that is, the bottom surface 31 a of each battery 30 is pressed against the intervening layer 80.
- FIG. 6B a part of each of the batteries 30 is embedded in the intervening layer 80.
- the amount by which the battery stack 20 is pushed into the intervening layer 80 is adjusted to such an amount that each battery 30 does not penetrate the intervening layer 80.
- the intervening layer 80 is cured to fix the heat dissipation member 70 and the battery stack 20.
- the battery module 10 is formed by the above steps.
- the intervening layer 80 for suppressing relative displacement between the battery stack 20 and the heat dissipation member 70 is disposed between the battery stack 20 and the heat dissipation member 70.
- the heat dissipation efficiency of the battery stack 20 can be enhanced by providing the heat dissipation member 70, and the battery stack 20 may collide with the heat dissipation member 70 even when the battery module 10 vibrates due to an external input. Can be reduced. As a result, damage to the battery stack 20 can be prevented, and the life of the battery module 10 can be extended. Further, since the transmission of the vibration of the heat dissipation member 70 to the battery stack 20 can be reduced, damage to the battery 30 can be prevented also by this.
- the battery module 10 according to the second embodiment differs from the first embodiment in that the intervening layer 80 has a multilayer structure.
- the present embodiment will be described.
- the structures of the battery stack 20 and the heat dissipation member 70 are basically the same as those of the first embodiment.
- the same components as in the first embodiment are given the same reference numerals, and the description thereof will be omitted as appropriate.
- FIG. 7 is a cross-sectional view showing a schematic structure of a battery module according to a second embodiment.
- the intervening layer 80 in the battery module 10 according to the present embodiment includes a sheet material 80 a and an adhesive layer 80 b.
- the sheet material 80a is provided on the main surface of the heat dissipation member 70 and is a member for preventing penetration of the plurality of batteries 30, and is made of, for example, a resin sheet or a rubber sheet having thermal conductivity and electrical insulation.
- the adhesive layer 80b is laminated on the main surface of the sheet material 80a, and a portion of each of the plurality of cells 30 is embedded.
- the adhesive layer 80 b is made of, for example, the same material as the intervening layer 80 in the first embodiment.
- the method of manufacturing the battery module 10 according to the present embodiment is the same as the method of manufacturing the battery module 10 according to the first embodiment, except for the step of laminating the intervening layer 80 on the main surface of the heat dissipation member 70 shown in FIG. Is different.
- the sheet material 80 a is fixed on the main surface of the heat dissipation member 70 prepared.
- the sheet material 80 a is fixed to the heat dissipation member 70 by, for example, an adhesive.
- a sheet-like adhesive is attached on the main surface of the sheet material 80a, or an adhesive is applied using a squeegee or the like, whereby the adhesive layer 80b is formed.
- the intervening layer 80 composed of the sheet material 80a and the adhesive layer 80b is formed.
- the intervening layer 80 is a sheet 80a for preventing penetration of the plurality of batteries 30, and an adhesive in which a portion of each of the plurality of batteries 30 is embedded. And a layer 80b.
- the possibility of collision between the battery stack 20 and the heat dissipation member 70 due to relative displacement can be further reduced.
- the heat dissipation member 70 is a plate-like member made of a metal plate, but the heat dissipation member 70 may have, for example, a shape as shown below.
- FIG. 8A is a perspective view showing a schematic structure of a heat dissipation member according to a modification.
- FIG. 8B is a cross-sectional view taken along a plane passing through the line B-B in FIG. 8A.
- the heat radiating member 70 is what the piping 71 of cylindrical shape was twisted. That is, the pipe 71 extends from one side of the formed heat dissipation member 70 toward the other side opposite to the one side, is bent in a U shape at the other side, extends from the other side toward the one side, and again at one side It is bent in a U-shape. And this is repeated and the thermal radiation member 70 is formed.
- the heat dissipation member 70 can also include a metal plate or the like provided with a slit at a predetermined position.
- the present invention can be used for a battery module and a method of manufacturing a battery module.
Abstract
Description
図1は、実施形態1に係る電池モジュールの概略構造を示す斜視図である。図2は、図1におけるA-A線を通る面に沿った断面図である。なお、図2では、電池の筐体内部および締結具の図示を省略する。
実施形態2に係る電池モジュール10は、介在層80が多層構造となっている点が実施形態1と異なる。以下、本実施形態について説明する。なお、電池スタック20および放熱部材70の構造は実施形態1と基本的に同一である。実施形態1と同一の構成については同一の符号を付し、その説明は適宜省略する。
Claims (9)
- 互いに電気的に接続された複数の電池が並べられてなる電池スタックと、
前記複数の電池が並ぶ方向に延在し、前記複数の電池と熱的に接続される放熱部材と、
前記電池スタックと前記放熱部材との間に配置され、前記電池スタックからの熱を前記放熱部材に伝えるとともに、前記電池スタックと前記放熱部材の相対変位を抑制するための介在層と、
を備えたことを特徴とする電池モジュール。 - 前記複数の電池のそれぞれの一部分は、前記介在層に埋め込まれている請求項1に記載の電池モジュール。
- 前記介在層は、隣接する2つの電池間に介在している請求項1または2に記載の電池モジュール。
- 前記介在層は、前記電池スタックの各電池と前記放熱部材とを接着する請求項1乃至3のいずれか1項に記載の電池モジュール。
- 前記介在層は、
前記放熱部材の主表面上に設けられ、前記複数の電池の貫通を防ぐためのシート材と、
前記シート材の主表面上に積層され、前記複数の電池のそれぞれの一部分が埋め込まれた接着剤層と、
を有する請求項1乃至4のいずれか1項に記載の電池モジュール。 - 前記複数の電池はそれぞれ、端子形成面と当該端子形成面に対向する底面とを有し、前記複数の電池の少なくとも一部は、前記端子形成面から前記底面までの長さが異なり、
前記複数の電池における隣接する電池の外部端子は、端子接続部材によって互いに接続され、
共通する端子接続部材で接続された電池に関し、前記端子形成面が略同一平面上に位置する請求項1乃至5のいずれか1項に記載の電池モジュール。 - 前記複数の電池は、セパレータを挟んで並べられ、
前記電池スタックは、前記放熱部材が配置される側の底面に、前記セパレータの底面と当該セパレータを挟む2つの電池の向かい合う側面とで形成される凹部を有し、
前記介在層の一部は、前記凹部に充填されている請求項1乃至6のいずれか1項に記載の電池モジュール。 - 複数の電池を、端子形成面が略同一平面上に位置するように並べる工程と、
前記複数の電池の外部端子に端子接続部材を固定して、前記複数の電池を有する電池スタックを形成する工程と、
前記複数の電池を並べる工程および前記電池スタックを形成する工程とは別に、前記電池スタックが搭載される側の放熱部材の表面上に介在層を積層する工程と、
前記電池スタックの前記端子接続部材が固定された側と反対側の底面を前記介在層に押し付けて、前記複数の電池のそれぞれの一部分を前記介在層に埋め込む工程と、
を含むことを特徴とする電池モジュールの製造方法。 - 前記介在層を硬化させて、前記放熱部材と前記電池スタックとを固定する工程をさらに含む請求項8に記載の電池モジュールの製造方法。
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US20130337310A1 (en) | 2013-12-19 |
US9431686B2 (en) | 2016-08-30 |
JP5852092B2 (ja) | 2016-02-03 |
US20160329617A1 (en) | 2016-11-10 |
US10186738B2 (en) | 2019-01-22 |
JPWO2012117681A1 (ja) | 2014-07-07 |
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