WO2019021980A1 - 電池モジュール - Google Patents
電池モジュール Download PDFInfo
- Publication number
- WO2019021980A1 WO2019021980A1 PCT/JP2018/027415 JP2018027415W WO2019021980A1 WO 2019021980 A1 WO2019021980 A1 WO 2019021980A1 JP 2018027415 W JP2018027415 W JP 2018027415W WO 2019021980 A1 WO2019021980 A1 WO 2019021980A1
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- WO
- WIPO (PCT)
- Prior art keywords
- battery
- electrode
- outer peripheral
- lead plate
- battery module
- Prior art date
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Classifications
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
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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
- H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
-
- 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
- H01M50/30—Arrangements for facilitating escape of gases
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/514—Methods for interconnecting adjacent batteries or 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
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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
Definitions
- the present invention relates to a battery module in which a convex electrode side of a battery is thermally coupled to a potting resin, and more particularly to a battery module in which a discharge valve is provided on the convex electrode side.
- a battery module in which the convex electrode side of the battery is thermally bonded to the potting resin has been developed (see Patent Document 1). Since the battery module of this structure can thermally couple adjacent batteries via the potting resin, it is characterized in that the batteries can be placed at a fixed position to reduce temperature unevenness. In the battery in which the discharge port of the discharge valve is provided in the convex electrode, it is necessary to prevent the potting resin from flowing in from the discharge port when the end of the battery is embedded in the potting resin. This is because the potting resin flowing in interferes with the normal operation of the discharge valve.
- the present inventor developed a structure in which the sealing label 106 is attached to the convex electrode 111 of the battery 101 and embedded in the potting resin as shown in the enlarged cross sectional view of FIG. .
- a ring-shaped sealing label 106 which is damaged by the exhaust gas is attached to the end face on the convex electrode 111 side.
- the sealing label 106 has an adhesive hole 107 for exposing the central portion of the convex portion electrode 111 at the center, and the outer peripheral portion is attached to the outer peripheral portion of the sealing plate 112.
- the sealing label 106 is attached to the outer peripheral portion of the convex electrode 111 and the outer peripheral portion of the sealing plate 112 to cover the discharge port 113 provided at the rising portion of the convex electrode 111, and the potting resin is discharged. It can prevent flowing in from the exit 113.
- the battery module shown in FIG. 7 has a drawback that the connection of the lead plate 103 for connecting in series or in parallel to the next battery is difficult, and the lead plate 103 can not be stably and reliably connected to the convex electrode 111. This is because the ring-shaped sealing label 106 attached to the outer peripheral portion narrows the exposed area of the convex portion electrode 111.
- the lead plate 103 of the metal plate is spot-welded, laser-welded, or ultrasonic-welded in a state of being in reliable contact with the exposed surface 111 A provided on the surface of the convex electrode 111, but the lead plate 103 In the state where the connection portion 133 can not be reliably brought into contact with the exposed surface 111A of the surface of the convex portion electrode 111, the connection can not be reliably and stably.
- spot welding is characterized in that the lead plate 103 can be connected reliably and stably.
- This method as shown in the enlarged plan view of FIG. 8, has both sides of the slits 136 provided for preventing reactive current.
- the present invention has been developed for the purpose of solving the above-mentioned drawbacks.
- One of the objects of the present invention is to provide a battery module capable of stably and reliably connecting a lead plate to a convex electrode while preventing potting resin from flowing from the outlet of the convex electrode.
- the battery module includes a plurality of batteries 1 each having a plurality of batteries 1 provided with discharge ports of discharge valves which are opened in the state where the internal pressure rises to the set pressure in the convex electrode 11 of the end surface.
- a battery holder 2 arranged at a fixed position in a parallel posture, and a lead plate 3 connected to a convex electrode 11 of the battery 1 arranged at a fixed position by the battery holder 2 and arranged in the same plane on the end face And a potting resin 13 thermally coupled to the lead plate 3.
- the battery holder 2 has an electrode window 24 for exposing the convex electrode 11 and an outer peripheral cover 21 disposed on the opposing surface of the outer peripheral edge of the convex electrode 11.
- the lead plate 3 is provided on the flat portion 31 stacked on the surface of the outer peripheral cover portion 21 and on the flat portion 31 and guided by the electrode window 24 of the battery holder 2 so as to protrude toward the convex portion electrode 11 And a connection recess 32 formed by connecting the projection 33 to the projection electrode 11.
- the first double-sided tape 4 is in close contact with the outer peripheral edge of the battery 1 and the outer peripheral cover of the battery holder 2 so that the outer peripheral edge of the battery 1 is in close contact with the outer peripheral cover 21;
- the second double-sided tape 5 is in close contact with the outer peripheral cover portion 21 of the battery holder 2 and the flat portion 31 of the lead plate 3 so that the outer peripheral cover portion 21 is in close contact with the flat portion 31 of the lead plate 3.
- the sealing label 6 is in close contact with the flat portion 31 of the plate 3, and the sealing label 6 closes the opening of the connection recess 32 of the lead plate 3.
- the first double-sided tape 4 and the second double-sided tape 5 The sealing label 6 has a structure for preventing the potting resin 13 from flowing into the discharge port provided in the convex electrode 11.
- the above battery module is characterized in that the lead plate can be stably and reliably connected to the convex electrode while preventing the potting resin from flowing into the inside from the discharge port of the convex electrode. The reason is that the above battery module can prevent the potting resin from flowing from the discharge port without attaching the sealing label to the surface of the convex electrode.
- the lead plate 3 is formed by connecting the sealing label 6 to the projecting electrode 11 without being attached to the projecting electrode 11.
- the first double-sided adhesive tape 4 and the second double-sided adhesive tape 5 are attached to both surfaces of the outer peripheral cover portion 21 of the battery holder 2 in addition to the sealing label 6. And the inflow of potting resin 13 from between the outer peripheral cover portion 21 of the lead plate 3 and the other.
- the potting resin flows from the discharge port of the convex portion electrode with the sealing label and the double-sided tape without attaching the sealing label to the convex portion electrode as in the conventional battery module Can block
- the above battery module does not have to adhere the sealing label accurately to the outer peripheral edge of the small convex electrode, so that the sealing label can be easily and easily attached to realize a feature that can be efficiently mass-produced.
- the lead plate can be connected by exposing the entire surface of the convex electrode surface, the feature that the lead plate can be reliably and stably connected is also realized.
- the lead plate is attached to the battery holder through the double-sided tape, and the battery holder can be attached to the electrode end face of the battery through the double-sided tape, the lead plate is not temporarily misaligned through the double-sided tape. Since the lead plate can be connected to the projection electrode, this also realizes the feature that the lead plate can be more reliably and stably connected to the projection electrode.
- the battery 1 can be made into a cylindrical battery.
- the sealing label 6 has an outer shape that covers a plurality of connection recesses 32 adjacent to one another and connected among the connection recesses 32 to which the protrusion electrodes 11 are connected. It can be done.
- connection recesses adjacent to each other with one sealing label.
- This sealing label enlarges the entire area so as to close the area including the plurality of connection recesses, and can also arrange the adhesive layer in the area between the connection recesses adjacent to each other. The adhesion can be enhanced to securely close each connection recess.
- the plurality of connection recesses are closed by one sealing label, it is possible to reduce the time and effort required for manufacturing and to reduce the manufacturing cost.
- the first double-sided tape 4 is ring-shaped so that the inner diameter is approximately equal to the inner diameter of the electrode window 24 and the outer diameter is equal to the outer diameter of the battery 1. It can be made approximately equal.
- the first double-sided tape can be reliably brought into close contact with the outer peripheral edge portion of the battery and the outer peripheral cover portion of the battery holder with a larger area, and the sealing can be performed.
- the entire surface of the convex electrode of the battery can be reliably exposed from the electrode window.
- the second double-sided tape 5 includes a plurality of electrode windows 24 opened in the battery holder 2 as an outer shape substantially equal to the outer shape of the lead plate 3 While covering the region, the through holes 5A along the electrode windows 24 can be opened at positions facing the respective electrode windows 24, and the connection recesses 32 can be disposed in the through holes 5A.
- the second double-sided tape can be reliably sealed in close contact with the flat portion of the lead plate and the opening edge portions of the plurality of electrode windows opened in the outer peripheral cover portion in a wider area. Further, the connection recess disposed in the through hole opened in the second double-sided tape can be reliably brought into contact with the projection electrode exposed from the electrode window. Furthermore, since the opening edge portions of the plurality of electrode windows can be in close contact with the flat portion of the lead plate with a single second double-sided tape, the time and effort required for manufacturing can be reduced, and the manufacturing cost can be reduced.
- FIG. 5 is an enlarged vertical vertical cross-sectional view of an essential part of the battery module according to the embodiment of the present invention, and is a cross-sectional view taken along line II of FIG. 4;
- FIG. 5 is an enlarged vertical cross-sectional view of relevant parts of a battery module according to an embodiment of the present invention, and is a cross-sectional view taken along line II-II in FIG.
- It is a perspective view of the battery module concerning one embodiment of the present invention. It is a top view of the battery module shown in FIG. It is a disassembled perspective view of the battery module shown in FIG.
- FIG. 6 is a cross-sectional view taken along line VI-VI of the battery module shown in FIG. 3; It is the principal part expanded sectional view which shows the connection structure of the battery of the conventional battery module, and the sealing label. It is an enlarged plan view which shows the connection structure of the battery and lead board which are shown in FIG.
- each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and one member is used in common as a plurality of elements, or conversely the function of one member is realized by a plurality of members It can be shared and realized.
- the contents described in some examples and embodiments may be applicable to other examples and embodiments.
- the vertical direction is specified in the drawings.
- the battery module 10 shown in the perspective view of FIG. 3 and the plan view of FIG. 4 is a battery holder in which the plurality of batteries 1 and the plurality of batteries 1 are arranged in parallel in a fixed position as shown in the exploded perspective view of FIG. 2 and a lead plate 3 for connecting the electrodes of the battery 1 arranged on the same plane, and a potting resin 13 thermally coupled to the lead plate 3.
- a plurality of batteries 1 are disposed at fixed positions by the battery holder 2, the lead plate 3 is connected to both ends of the battery 1, and the potting resin 13 is a lead as shown in the vertical sectional view of FIG. It is disposed on the outside of the plate 3 and thermally coupled to the lead plate 3 and the end of the battery 1.
- the battery module 10 is configured such that the liquid or paste potting resin 13 does not infiltrate into the interior through the discharge port of the discharge valve provided on the convex electrode 11 of the battery 1 in the state of being filled with the potting resin 13. And a second double-sided tape 5 and a sealing label 6 are provided.
- the battery 1 is a cylindrical battery of a lithium ion secondary battery in which an outlet is provided in the convex electrode 11.
- the lithium ion secondary battery has a large capacity with respect to size and weight, and can increase the total capacity of the battery module 10.
- the battery module of the present invention does not specify the battery 1 as a lithium ion secondary battery.
- other rechargeable batteries such as nickel hydrogen batteries and nickel cadmium batteries can also be used.
- the battery 1 is a cylindrical battery, but a prismatic battery can also be used for the battery.
- Each battery 1 is connected to the adjacent batteries 1 in series or in parallel by welding the lead plate 3 to the convex electrode 11 at both ends by a method such as spot welding.
- the battery 1 incorporates a discharge valve (not shown) inside the sealing plate.
- the discharge valve opens when the internal pressure of the battery 1 becomes higher than the set pressure, and prevents the battery case from bursting.
- the opening discharge valve discharges the exhaust gas to the outside to prevent an increase in internal pressure.
- the sealing plate is provided with a discharge port around the convex electrode 11.
- the battery 1 opens the discharge valve and discharges the exhaust gas to the outside from the discharge port provided around the convex portion electrode 11, thereby preventing the rupture due to the increase of the internal pressure. .
- the battery holder 2 In the battery holder 2, the battery 1 is in a parallel posture, and the end faces of the convex electrode 11 and the flat electrode 12 are disposed on the same plane and disposed at a predetermined position.
- the battery holder 2 is manufactured by molding an insulating material such as plastic.
- the outer peripheral cover portion 21 covering both end surfaces of each battery 1 whose both end surfaces are arranged in the same plane and the respective batteries 1 are inserted and arranged in a fixed position
- the insertion portion 22 is integrally formed.
- the battery holder 2 arranges all the batteries 1 at a fixed position in a parallel posture, and connects the lead plates 3 to both ends of the batteries 1 by welding.
- the battery holder 2 In order to connect the battery holders 2, the battery holder 2 is placed at a specific position by inserting the batteries 1 into the insertion portion 22 so that the both ends thereof are positioned almost in the same plane.
- the battery holder 2 shown in the exploded perspective view of FIG. 5 is divided into two on both sides of the battery 1 (two divided up and down in FIG. 5) and molded with plastic. Furthermore, the battery holder 2 shown in FIG. 3 and FIG. 4 is provided with a filling chamber 23 for filling the potting resin 13 on the surface of the outer peripheral cover portion 21 covering the end of the battery 1.
- the battery holder 2 disposed on the upper side is provided with the filling chamber 23 on the upper surface
- the battery holder 2 disposed on the lower side is provided with the filling chamber 23 on the lower surface.
- the battery holder 2 is provided with the insertion part 22 which inserts the battery 1 and arrange
- the insertion portion 22 is cylindrical.
- the cylindrical insertion portion 22 has an inner diameter slightly larger than the outer diameter of the battery 1 so that the battery 1 can be inserted smoothly.
- a slight gap is provided between the surface of the battery 1 and the inner surface of the insertion portion 22.
- the battery holder 2 can form plastic into a cylindrical shape and can provide the insertion portion 22 inside, or can form plastic into a block shape and form a cylindrical through hole inside thereof to provide the insertion portion 22 be able to.
- the battery holder 2 which shape
- the battery holder 2 inserts the adjacent battery 1 into the insertion portion 22 which is separated and shaped, so thermal runaway can be prevented more effectively.
- the battery holder 2 for inserting the battery 1 into the insertion portion 22 of the through hole has a large heat capacity, can absorb the heat of the battery 1 and can prevent the temperature rise of the battery 1, and the temperature difference between the adjacent batteries 1 It can be made smaller.
- outer peripheral cover portions 21 each having an electrode window 24 that exposes the end of the battery 1 and is connected to the lead plate 3 are provided at both ends of the insertion portion 22.
- the electrode window 24 exposes the end face of the battery 1 inserted into the insertion portion 22 to the outside from the insertion portion 22, that is, to the bottom of the filling chamber 23.
- the lead plate 3 is welded to the electrodes at both ends. The lead plate 3 welded to the electrode is disposed at the bottom of the filling chamber 23.
- the filling chamber 23 is provided with a peripheral wall 25 along the outer periphery of the area filled with the potting resin 13 in order to fill the potting resin 13 in uncured and paste form.
- the inside of the peripheral wall 25 is a filling chamber 23.
- the thickness of the potting resin 13 filled in the filling chamber 23 can be controlled by the height of the peripheral wall 25. By raising the peripheral wall 25, a large amount of potting resin 13 can be deeply filled into the filling chamber 23.
- the depth of the filling chamber 23 is set to such a thickness as, for example, about 1 mm to 10 mm to improve the heat conduction of the adjacent battery 1 and reduce the temperature difference by the potting resin 13 filled therein.
- the lead plate 3 is a conductive metal plate and is connected to the end of the adjacent battery 1 to connect the batteries 1 in series or in parallel.
- the lead plate 3 is connected to the convex electrode 11 and the flat electrode 12 which are positive and negative electrodes of the battery 1 to connect the batteries 1 in series or in parallel.
- the lead plate 3 has a connection recess 32 in the flat portion 31.
- the flat portion 31 is disposed on the bottom surface of the filling chamber 23 of the battery holder 2, that is, on the outer surface of the outer peripheral cover portion 21 provided on the battery holder 2, and the connection recess 32 is guided by the electrode window 24 of the outer peripheral cover portion 21.
- a projecting surface 33 projecting toward the electrode of the battery 1 is connected to the battery 1.
- the lead plate 3 has a flat portion 31 around the connection recess 32 and is shaped so that the opening of the connection recess 32 can be closed by the sealing label 6 bonded to the flat portion 31.
- the lead plate 3 in which the connection recess 32 is provided in the flat portion 31 is manufactured by cutting and bending a flat metal plate.
- the projection surface 33 is connected to the projection electrode 11 provided on the end face of the battery 1 and the flat electrode 12, the projection electrode 11 of the battery 1 placed in a fixed position with the battery holder 2 is flat. It is disposed at the opposite position to the electrode 12.
- the lead plate 3 has a separation slit 34 along the outer periphery of the connection recess 32.
- the separation slit 34 is not provided on the entire periphery of the connection recess 32, and a portion without the separation slit 34 is used as a connecting portion 35, and the projecting surface 33 is connected to the flat portion 31 via the connecting portion 35.
- the connecting portion 35 is bent, and the projecting surface 33 of the connecting recess 32 is inserted into the electrode window 24 so as to be in contact with and connected to the electrode of the battery 1.
- the lead plate 3 in which the separation slit 34 is provided between the projecting surface 33 and the flat portion 31 makes the connecting recess 32 deeper, in other words, causes the projecting surface 33 to protrude high from the flat portion 31 to the electrode of the battery 1. It can connect.
- the battery module of the present invention can be connected to the electrodes of the battery by projecting the projecting surface from the flat portion without necessarily providing the separation slit on the outer peripheral edge of the connection recess of the lead plate.
- the protruding surface 33 connected to the electrode of the battery 1 is provided with a welding slit 36 extending in the direction away from the connecting portion 35, and welding points 37 are provided on both sides of the welding slit 36 for pressing and welding positive and negative welding electrodes.
- the illustrated lead plate 3 is provided with two welding points 37 on both sides of the welding slit 36, and a welding projection is provided at the welding point 37 so that welding can be reliably performed to the electrodes of the battery 1. In a state where this lead plate 3 is set in the filling chamber 23 of the battery holder 2, the connection recess 32 is guided to the electrode window 24, and the welding protrusion is in contact with the protrusion electrode 11 of the battery 1 and the flat electrode 12.
- the lead plate 3 is pressed by the welding electrode to contact the welding protrusion with the electrode of the battery 1 to connect it can.
- the projecting surface 33 can be spot-welded and reliably and stably connected to the electrode of the battery 1, the present invention does not specify the state of connecting the projecting surface 33 to the electrode of the battery 1 as spot welding. This is because the projecting surface can be connected to the electrode of the battery by laser welding or ultrasonic welding. In the step of connecting the projecting surface 33 to the electrode of the battery 1 by laser welding, the projecting surface 33 is pressed to be in contact with the electrode of the battery 1 in a state of irradiating a laser beam.
- the battery module 10 shown in the enlarged cross-sectional view of the main part of FIGS.
- the double-sided adhesive tape 4 and the second double-sided adhesive tape 5 are attached, and a sealing label 6 is attached to the surface of the lead plate 3 so as to close the connection recess 32.
- the first double-sided adhesive tape 4, the second double-sided adhesive tape 5, and the sealing label 6 prevent the uncured potting resin 13 from intruding into the interior from the outlet provided in the convex electrode 11. It adheres only to the convex electrode 11 side.
- the first double-sided adhesive tape 4 is ring-shaped and is in close contact with the outer peripheral edge of the battery 1, that is, the outer peripheral edge of the sealing plate and outside the convex electrode 11 and the outer peripheral cover 21 of the battery holder 2. As a result, the outer peripheral edge of the battery 1 is closely attached to the outer peripheral cover 21 of the battery holder 2 without any gap, thereby preventing the potting resin 13 from entering from the gap between the sealing plate and the outer peripheral cover 21.
- the first double-sided tape 4 shown in FIGS. 1 and 2 has a ring shape in which the inner diameter is approximately equal to the inner diameter of the electrode window 24 and the outer diameter is approximately equal to the outer diameter of the battery 1.
- the battery 1 is in close contact with the sealing plate of the battery 1 and the outer peripheral cover 21.
- the first double-sided adhesive tape 4 is larger than the outer diameter of the convex electrode 11 and has a shape such that the exposed surface of the convex electrode 11 is not reduced in a state of being attached to the sealing plate.
- the first double-sided adhesive tape 4 is a tape provided with an adhesive layer on both sides, and is disposed between the outer peripheral edge of the battery 1 and the outer peripheral cover 21 and pressed against the outer peripheral cover 21 for close contact.
- the second double-sided adhesive tape 5 is closely attached between the outer peripheral cover portion 21 of the battery holder 2 and the flat portion 31 of the lead plate 3 so that the surface of the outer peripheral cover portion 21 is in close contact with the flat portion 31 of the lead plate 3 Also, the penetration of the potting resin 13 from the gap between the outer peripheral cover portion 21 and the lead plate 3 is prevented.
- the outer shape of the second double-sided tape 5 is larger than the outer shape of the first double-sided tape 4 and is in close contact with the surface of the outer peripheral cover 21 over a wide area to reliably seal between the outer peripheral cover 21 and the lead plate 3 Do.
- the second double-sided tape 5 conforms to the inner shape of the filling chamber 23 so as to cover the area including the opening edges of the plurality of electrode windows 24 opened in the outer peripheral cover portion 21 of the battery holder 2. It has an outer shape.
- the outer shape of the second double-sided tape 5 is made equal to the outer shape of the lead plate 3 so that the whole of the lead plate 3 can be covered with one second double-sided tape 5.
- the second double-sided tape 5 has a through hole 5A open at a portion facing the plurality of electrode windows 24 opened at the bottom of the filling chamber 23.
- the through hole 5A is connected to the connection recess 32 of the lead plate 3. Are connected to the projecting electrode 11 exposed from the electrode window 24.
- the inner diameter of the through hole 5A opened in the second double-sided tape 5 is also substantially equal to the inner diameter of the electrode window 24 and is slightly larger than the outer diameter of the convex portion electrode 11 exactly. It is because it adheres and it does not narrow the exposed surface of the convex part electrode 11.
- the second double-sided tape 5 is also a tape provided with an adhesive layer on both sides, and is disposed between the outer peripheral cover portion 21 and the lead plate 3 and is pressed and brought into close contact with the lead plate 3.
- the sealing label 6 is a tape provided with an adhesive layer on one side of the tape which does not transmit the potting resin 13.
- the sealing label 6 is in close contact with the flat portion 31 of the lead plate 3 in a state of closing the opening of the connection recess 32.
- the sealing label 6 has a shape in which the sealing label 6 is in close contact with the flat surface 31 of the entire periphery of the connection recess 32 and is in close contact with the flat surface 31 to prevent the potting resin 13 from flowing into the connection recess 32.
- the sealing label 6 of FIGS. 4 and 5 covers a plurality of connecting recesses 32 adjacent to each other so as to cover and close a region including the plurality of connecting recesses 32 to which the convex electrode 11 is connected.
- the sealing label 6 shown in the figure has an outer shape.
- the sealing label 6 shown in the figure has a zigzag outer shape so as to simultaneously close the four connection recesses 34 arranged in a zigzag shape.
- the sealing label 6 is attached to the surface of each lead plate 3 and is in close contact with the entire peripheral portions of the plurality of connecting recesses 32 adjacent to each other to reliably close the opening of the connecting recesses 32. .
- the power supply module 10 having the above structure is assembled in the following steps. (1) Attach the first double-sided tape 4 to the outer peripheral edge of the sealing plate of each battery 1. (2) The battery 1 to which the first double-sided tape 4 is attached is inserted into the insertion portion 22 of the divided battery holder 2, the respective battery holders 2 are connected, and the outer circumference of the first double-sided tape 4 is It adheres to the inner surface of the cover 21. In this state, the sealing plate is in close contact with the inner surface of the outer peripheral cover portion 21, and the gap between the sealing plate and the outer peripheral cover portion 21 is closed.
- the second double-sided tape 5 is attached to the outside of the electrode window 24 on the upper surface of the outer peripheral cover 21 of the battery holder 2 or on the inner surface of the lead plate 3 and on the outer periphery of the connection recess 32
- the second double-sided tape 5 is attached as follows.
- the lead plate 3 is guided to the filling chamber 23 of the battery holder 2 and the second double-sided tape 5 is in close contact with the inner surface of the lead plate 3 and the surface of the outer peripheral cover portion 21.
- the gap with the part 21 is closed.
- the connection recess 32 of the lead plate 3 is guided by the electrode window 24 of the outer peripheral cover portion 21, and the projecting surface 33 is in contact with the electrode of the battery 1.
- the battery module of the present invention is optimally used for a battery module having a structure in which the end face side of a battery provided with a discharge valve is sealed with potting resin.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Mounting, Suspending (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
Description
この構造の電池モジュールは、ポッティング樹脂を介して隣接する電池を熱結合できるので、電池を定位置に配置して温度斑を少なくできる特徴がある。排出弁の排出口を凸部電極に設けている電池は、電池の端部をポッティング樹脂に埋設するときにポッティング樹脂が排出口から流入するのを阻止する必要がある。流入するポッティング樹脂が排出弁の正常な動作を阻害するからである。本発明者は、このことを実現するために、図7の拡大断面図に示すように、電池101の凸部電極111に封止ラベル106を付着して、ポッティング樹脂に埋設する構造を開発した。この図の電池モジュールは、排出ガスで破損するリング状の封止ラベル106を、凸部電極111側の端面に付着している。封止ラベル106は、中心に凸部電極111の中央部を露出させる接着穴107を開口しており、外周部を封口板112の外周部に付着している。この封止ラベル106は、凸部電極111の外周部と封口板112の外周部とに付着されて、凸部電極111の立ち上り部に設けている排出口113をカバーして、ポッティング樹脂が排出口113から流入するのを防止できる。
電池1は、両端に正負の電極を設けており、一方の電極を封口板の凸部電極11とし、他方の端部を外装缶の底面の平面電極12としている。電池1は、凸部電極11に排出口を設けているリチウムイオン二次電池の円筒形電池である。リチウムイオン二次電池は、大きさや重量に対する容量が大きく、電池モジュール10のトータル容量を大きくできる。ただし、本発明の電池モジュールは、電池1をリチウムイオン二次電池には特定しない。電池1には、充電できる他の電池、たとえばニッケル水素電池やニッケルカドミウム電池等も使用できる。また、図の電池モジュール10は、電池1を円筒形電池とするが、電池には角形電池も使用できる。各々の電池1は、その両端の凸部電極11にリード板3をスポット溶接などの方法で溶接して、隣接する電池1を直列又は並列に接続している。
電池ホルダー2は、電池1を平行姿勢とし、凸部電極11及び平面電極12のある端面を同一平面に配置して定位置に配置する。電池ホルダー2は、プラスチック等の絶縁材を成形して制作される。図3と図4に示す電池ホルダー2は、両端面を同一平面に配置している各々の電池1の両端面部をカバーする外周カバー部21と、各々の電池1を挿入して定位置に配置する挿入部22とを一体的に成形して設けている。電池ホルダー2は、すべての電池1を平行な姿勢で定位置に配置して、電池1の両端にリード板3を溶接して接続するが、各々の電池1の端面に平面状のリード板3を接続するために、電池ホルダー2は、各々の電池1をその両端部がほぼ同一面に位置するように、挿入部22に入れて特定の位置に配置している。
リード板3は、導電性の金属板で、隣接する電池1の端部に接続されて、電池1を直列又は並列に接続する。リード板3は、電池1の正負の電極である凸部電極11と平面電極12に接続されて、電池1を直列又は並列に接続する。リード板3は、平面部31に接続凹部32を設けている。平面部31は、電池ホルダー2の充填室23の底面、すなわち、電池ホルダー2に設けた外周カバー部21の外面に配置され、接続凹部32は、外周カバー部21の電極窓24に案内されて、電池1の電極に向かって突出する突出面33を電池1に接続している。リード板3は、接続凹部32の周囲は平面部31があって、平面部31に接着される封止ラベル6で接続凹部32の開口部を閉塞できる形状としている。
第1の両面テープ4はリング状で、電池1の外周縁部、すなわち封口板の外周縁部であって凸部電極11よりも外側と、電池ホルダー2の外周カバー部21との間に密着されて、電池1の外周縁部を電池ホルダー2の外周カバー部21に隙間なく密着して、封口板と外周カバー部21との隙間からのポッティング樹脂13の浸入を阻止する。図1と図2に示す第1の両面テープ4は、内径を電極窓24の内径にほぼ等しく、外径を電池1の外径にほぼ等しく、正確には僅かに小さくしてなるリング状で、電池1の封口板と外周カバー部21との間に密着している。第1の両面テープ4は凸部電極11の外径よりも大きく、封口板に付着される状態で、凸部電極11の露出面を小さくしない形状としている。第1の両面テープ4は、両面に粘着層を設けているテープで、電池1の外周縁部と外周カバー部21との間に配置され、外周カバー部21を押圧して密着される。
第2の両面テープ5は、電池ホルダー2の外周カバー部21とリード板3の平面部31との間に密着されて、外周カバー部21の表面をリード板3の平面部31に密着して、外周カバー部21とリード板3との隙間からのポッティング樹脂13の浸入を阻止する。第2の両面テープ5の外形は第1の両面テープ4の外形よりも大きく、外周カバー部21の表面に広い面積で密着されて、外周カバー部21とリード板3との間を確実に密閉する。図5に示す第2の両面テープ5は、電池ホルダー2の外周カバー部21に開口された複数の電極窓24の開口縁部を含む領域を被覆できるように、充填室23の内形に沿う外形としている。言い換えると、第2の両面テープ5の外形をリード板3の外形と等しくして、1枚の第2の両面テープ5で、リード板3の全体を被覆できるようにしている。さらに、第2の両面テープ5は、充填室23の底面に開口された複数の電極窓24と対向する部分に貫通孔5Aを開口しており、この貫通孔5Aにリード板3の接続凹部32を通過させて電極窓24から露出する凸部電極11に接続するようにしている。第2の両面テープ5に開口される貫通孔5Aの内径も、電極窓24の内径にほぼ等しく、正確には僅かに大きくして、凸部電極11の外径よりも大きくしている。付着されて凸部電極11の露出面を狭くしないためである。第2の両面テープ5も、両面に粘着層を設けているテープで、外周カバー部21とリード板3との間に配置され、リード板3を押圧して密着される。
封止ラベル6は、ポッティング樹脂13を透過させないテープの片面に粘着層を設けたテープである。この封止ラベル6は、リード板3の平面部31に、接続凹部32の開口部を閉塞する状態で密着される。封止ラベル6は、接続凹部32の全周の平面部31に密着される形状で、平面部31に密着されて、接続凹部32にポッティング樹脂13が流入するのを阻止する。図4と図5の封止ラベル6は、凸部電極11が接続される複数の接続凹部32を含む領域を被覆して閉塞できるように、互いに隣接して連なる複数の接続凹部32を被覆する外形としている。具体的には、図に示す封止ラベル6は、ジグザグ状に並ぶ4つの接続凹部34を同時に閉塞できるように、ジグザグ状の外形としている。この封止ラベル6は、各リード板3の表面に付着されて、互いに隣接する複数の接続凹部32の周辺部の全体に密着して、これ等の接続凹部32の開口部を確実に閉塞する。
(1)各々の電池1の封口板の外周縁部に第1の両面テープ4を付着する。
(2)第1の両面テープ4を付着している電池1を、分割された電池ホルダー2の挿入部22に挿入し、それぞれの電池ホルダー2を連結して、第1の両面テープ4を外周カバー部21の内面に密着する。この状態で封口板が外周カバー部21の内面に密着されて、封口板と外周カバー部21との隙間は閉塞される。
(3)電池ホルダー2の外周カバー部21の上面であって、電極窓24の外側に第2の両面テープ5を付着し、又は、リード板3の内面であって接続凹部32の外周に位置するように第2の両面テープ5を付着する。
(4)電池ホルダー2の充填室23にリード板3を案内して、第2の両面テープ5をリード板3の内面と、外周カバー部21の表面に密着して、リード板3と外周カバー部21との隙間を閉塞する。この状態で、リード板3の接続凹部32は外周カバー部21の電極窓24に案内されて、突出面33が電池1の電極に接触される。
(5)リード板3の接続凹部32に設けている突出面33を電池1の電極にスポット溶接する。
(6)リード板3の表面に封止ラベル6を付着して、リード板3に設けている接続凹部32の開口部をポッティング樹脂13が通過しないように閉塞する。
(7)未硬化で液状ないしペースト状のポッティング樹脂13を充填室23に注入して硬化させる。硬化するポッティング樹脂13は、リード板3を介して電池1に熱結合されて、電池1の温度上昇を低減する。
2…電池ホルダー
3…リード板
4…第1の両面テープ
5…第2の両面テープ
5A…貫通孔
6…封止ラベル
10…電池モジュール
11…凸部電極
12…平面電極
13…ポッティング樹脂
21…外周カバー部
22…挿入部
23…充填室
24…電極窓
25…周壁
31…平面部
32…接続凹部
33…突出面
34…分離スリット
35…連結部
36…溶接スリット
37…溶接点
101…電池
103…リード板
106…封止ラベル
107…接着穴
111…凸部電極
111A…露出面
112…封口板
113…排出口
133…接続部
136…スリット
137…溶接点
Claims (5)
- 内圧が設定圧力に上昇する状態で開弁する排出弁の排出口を端面の凸部電極に設けてなる複数の電池と、
前記電池を平行姿勢で定位置に配置してなる電池ホルダーと、
前記電池ホルダーで定位置に配置され、かつ端面を同一平面に配置してなる前記電池の凸部電極に接続してなるリード板と、
前記リード板に熱結合してなるポッティング樹脂とを備える電池モジュールであって、
前記電池ホルダーは、前記凸部電極を露出する電極窓を有すると共に、前記凸部電極の外周縁の対向面に配置する外周カバー部を有し、
前記リード板は、前記外周カバー部の表面に積層される平面部と、前記平面部に設けられて前記電池ホルダーの電極窓に案内されて、前記凸部電極に向かって突出して突出面を前記凸部電極に接続してなる接続凹部とを有し、
前記電池の外周縁部と前記電池ホルダーの外周カバー部との間に第1の両面テープが密着されて、前記電池の外周縁部が前記外周カバー部に密着され、
かつ、前記電池ホルダーの外周カバー部と前記リード板の平面部との間に第2の両面テープが密着されて、前記外周カバー部が前記リード板の前記平面部に密着され、
さらに、前記リード板の平面部に封止ラベルが密着されて、前記封止ラベルが前記リード板の接続凹部の開口部を閉塞して、
前記第1の両面テープと前記第2の両面テープと前記封止ラベルとで、前記凸部電極に設けてなる前記排出口へのポッティング樹脂の流入阻止構造としてなることを特徴とする電池モジュール。 - 請求項1に記載される電池モジュールであって、
前記電池が円筒形電池であることを特徴とする電池モジュール。 - 請求項1または2に記載される電池モジュールであって、
前記封止ラベルが、前記凸部電極が接続される前記接続凹部のうち、互いに隣接して連なる複数の前記接続凹部を被覆する外形であることを特徴とする電池モジュール。 - 請求項1ないし3のいずれかに記載される電池モジュールであって、
前記第1の両面テープは、リング状であって、内径が前記電極窓の内径に略等しく、外径が前記電池の外径に略等しいことを特徴とする電池モジュール。 - 請求項1ないし4のいずれかに記載される電池モジュールであって、
前記第2の両面テープは、リード板の外形と略等しい外形を有し、電池ホルダーに開口された複数の前記電極窓を含む領域を被覆すると共に、各電極窓と対向する位置には、該電極窓に沿う貫通孔を開口して、前記貫通孔に前記接続凹部を配置してなることを特徴とする電池モジュール。
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KR20230011107A (ko) * | 2021-07-13 | 2023-01-20 | (주)코미트 | 원형니켈단자가 표면실장된 전극결합판을 갖는 직병렬 리튬이온배터리팩 |
KR102598325B1 (ko) * | 2021-07-13 | 2023-11-02 | (주)코미트 | 원형니켈단자가 표면실장된 전극결합판을 갖는 직병렬 리튬이온배터리팩 |
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AU2018307012B2 (en) | 2024-02-22 |
JPWO2019021980A1 (ja) | 2020-05-28 |
AU2018307012A1 (en) | 2020-02-27 |
EP3660947A4 (en) | 2020-07-08 |
EP3660947B1 (en) | 2021-09-01 |
EP3660947A1 (en) | 2020-06-03 |
JP7160808B2 (ja) | 2022-10-25 |
US20200220147A1 (en) | 2020-07-09 |
US11276906B2 (en) | 2022-03-15 |
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