WO2022237807A1 - 大容量电池的导电连接片、极柱、集流盘及导电连接结构 - Google Patents

大容量电池的导电连接片、极柱、集流盘及导电连接结构 Download PDF

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Publication number
WO2022237807A1
WO2022237807A1 PCT/CN2022/092058 CN2022092058W WO2022237807A1 WO 2022237807 A1 WO2022237807 A1 WO 2022237807A1 CN 2022092058 W CN2022092058 W CN 2022092058W WO 2022237807 A1 WO2022237807 A1 WO 2022237807A1
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WIPO (PCT)
Prior art keywords
pole
conductive
capacity battery
conductive connection
battery according
Prior art date
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PCT/CN2022/092058
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English (en)
French (fr)
Inventor
翟腾飞
刘毅
雷政军
张三学
Original Assignee
陕西奥林波斯电力能源有限责任公司
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.)
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Priority claimed from CN202110527767.XA external-priority patent/CN113517521A/zh
Priority claimed from CN202110527612.6A external-priority patent/CN113314807A/zh
Priority claimed from CN202110527774.XA external-priority patent/CN113224472A/zh
Priority claimed from CN202110527610.7A external-priority patent/CN113224474A/zh
Priority claimed from CN202110678638.0A external-priority patent/CN113381134A/zh
Priority claimed from CN202110680665.1A external-priority patent/CN113381135A/zh
Application filed by 陕西奥林波斯电力能源有限责任公司 filed Critical 陕西奥林波斯电力能源有限责任公司
Publication of WO2022237807A1 publication Critical patent/WO2022237807A1/zh

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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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • 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 application relates to the field of batteries, in particular to a conductive connection piece, a pole, a current collecting plate and a conductive connection structure of a large-capacity battery.
  • Lithium-ion batteries have been widely used due to their high specific energy, long charge and discharge life, and wide operating temperature range.
  • the traditional lithium battery design adopts steel case, aluminum-plastic film or plastic case, etc.
  • the current extraction structure is designed according to the charge and discharge of small current. This design is difficult to carry large current charge and discharge, which affects the use effect and load demand of lithium battery.
  • the pole of the battery is the output terminal of the battery current, and the current of the battery is exported through the connection between the pole and the winding core.
  • the current transfer between the pole of the cylindrical battery and the internal cell in the lithium battery industry mostly requires the transfer of parts such as plates and adapter plates. There are many parts, lengthy welding process, less internal space, and the capacity of the battery is not high.
  • the maximum capacity of known cylindrical batteries does not exceed 100Ah.
  • the maximum capacity of the existing lithium battery is 400Ah for the square battery, while the maximum capacity for the cylindrical battery is not more than 100Ah.
  • the poles and tabs of the battery are connected by sheet connectors. This structure cannot meet the needs of charging and discharging large-capacity batteries. If it is used on a large-capacity battery, when the charging and discharging current of the battery is greater than the carrying capacity of the connecting piece, the connecting piece will easily heat up or even burn out, which will easily cause damage to the battery or thermal runaway. If you design a battery with a capacity greater than 1000Ah, the connection between the pole and the tab becomes the biggest problem.
  • pole and tab current collectors of large-capacity batteries need to be fully connected, but when welding, the poles and tabs must be completely connected. Due to the influence of the pole, the vertical projection of the pole of the flow plate cannot be welded with the tab current collector, so the current transmission surface is much smaller, and poor contact will cause the contact surface to heat up, which affects the charging and discharging of the large-capacity battery .
  • the present application proposes a conductive connecting piece, a pole, a current collecting plate and a conductive connecting structure of a large-capacity battery.
  • the conductive connecting piece realizes the reliable connection between the current collecting plate and the pole, and at the same time greatly increases the overcurrent area of the pole to realize the high current charging and discharging of the battery, which is suitable for large capacity Battery.
  • the conductive connection structure requires only a small number of parts to realize the connection between the tab and the pole, and at the same time satisfies the ability to pass a large current.
  • a reliable connection between the current collecting plate and the pole can be realized, and the flow area can be greatly increased at the same time.
  • the present application provides a conductive connecting sheet of a large-capacity battery, the conductive connecting sheet is a planar conductive sheet or a foldable conductive sheet, and the conductive connecting sheet is respectively connected to a pole, a tab or a current collector.
  • a rectangular connection grid of equal width and distance is provided in the middle of the conductive connecting piece along the centerline, and both sides of the grid of the conductive connecting piece are respectively connected to poles and lugs or tab current collectors.
  • the two sides of the grid on the same surface of the conductive connecting sheet are respectively connected to the poles and tabs or tab current collectors.
  • the conductive connecting sheet can be folded along the central line.
  • the thickness of the conductive connecting sheet is not greater than 3mm.
  • the shape and size of both sides of the grid are the same as that of the tab current collecting plate.
  • the conductive connection sheet is composed of a plurality of metal connection sheets with different lengths, and the metal connection sheets can be folded after being welded.
  • the metal connecting sheet is folded into an M shape after welding.
  • the metal connection sheet is folded, the metal connection sheet is completely included in the upward projection surface of the top surface of the winding core.
  • the thickness of the metal connecting sheet is no greater than 2 mm, and no less than 2 layers.
  • a pole of a large-capacity battery including a pole and the aforementioned conductive connecting piece, and the pole includes an upper pole insert, an insulating gasket, a pole lower insert, and an insulating connector , the side of the same surface of the conductive connecting piece is welded in the center of the pole. After welding, the pole is bent outwards at 90 degrees along the vertical center line of the grid, and the other side is welded with the tab current collector, and then the unwelded surface is folded up and down. The two layers are compressed and welded, or conductive adhesive is added between the upper and lower layers to connect.
  • the upper pole insert has a ring structure, and a plurality of evenly distributed installation holes can be opened on the ring for fixing with the pole lower insert.
  • the insulating gasket is a silicone rubber gasket, which can be stuck on the edge of the pole hole of the battery cover, and the upper pole insert and the top surface of the battery lid, the pole bottom insert and the side of the pole hole,
  • the lower insert of the pole is insulated from the bottom surface of the upper cover of the battery, and the upper and lower sides of the insulating gasket have the same installation holes as the upper insert of the pole.
  • the main body of the lower pole insert is a columnar structure
  • the middle part of the waist has the same ring structure as the pole upper insert
  • the ring has installation holes with the same distribution and size as the pole upper insert
  • the bottom With a frusto-conical welded base.
  • the insulating connector is a rivet
  • the head of the rivet is provided with an insulating post to ensure that the rivet does not contact the battery cover after riveting.
  • the material of the conductive connecting piece, the upper pole insert, and the lower pole insert is copper or aluminum or copper or aluminum with plating.
  • the present application provides another pole of a large-capacity battery, which includes a pole and the aforementioned conductive connecting piece, and the pole includes an upper pole insert, an insulating gasket, a pole lower insert, and a lower insert current collector. Plates and insulating connectors, the metal connecting sheets of different lengths of the conductive connecting piece are from short to long, one end is welded on the tab current collecting plate in turn, and the other end is sequentially welded on the pole lower insert current collecting plate, each time The welding positions of the two metal connecting sheets are parallel but not overlapping from the inside to the outside.
  • the upper pole insert has a ring structure, and a plurality of evenly distributed installation holes can be opened on the ring for fixing with the pole lower insert.
  • the insulating gasket is a silicone rubber gasket, which can be stuck on the edge of the pole hole of the battery cover, and the upper pole insert and the top surface of the battery lid, the pole bottom insert and the side of the pole hole,
  • the lower insert of the pole is insulated from the bottom surface of the upper cover of the battery, and the upper and lower sides of the insulating gasket have the same installation holes as the upper insert of the pole.
  • the main body of the lower pole insert is a columnar structure
  • the middle part of the waist has the same ring structure as the pole upper insert
  • the ring has installation holes with the same distribution and size as the pole upper insert
  • the bottom With a frusto-conical welded base.
  • the shape and size of the collector plate of the lower insert is the same as that of the lug collector plate, and it is centrally welded to the round platform at the bottom of the lower insert of the pole.
  • the metal connecting sheet is welded, it needs to be folded into an M shape or other shapes, and after folding, the metal connecting sheet is completely included in the upward projection surface of the top surface of the winding core.
  • the insulating connector is a rivet
  • the head of the rivet is provided with an insulating post to ensure that the rivet does not contact the battery cover after riveting.
  • the material of the conductive connecting sheet, the metal connecting sheet, the upper pole insert, and the lower pole insert is copper or aluminum or copper or aluminum with plating.
  • the present application provides a conductive connection structure for a large-capacity battery, including a current collecting plate and a conductive connecting sheet, the conductive connecting sheet is a planar conductive sheet, and the current collecting plate includes a plate body and a package arranged on the plate body. Edge, the conductive connecting piece is arranged in the wrapping; wherein, the wrapping is the same shape and size as the pole.
  • the bottom surface of the current collecting plate is welded to the tab, and the wrapping is welded to the body of the pole.
  • the wrapping is rectangular, circular or square, and the height of the wrapping is not less than 5mm, and the thickness is not more than 1mm.
  • the disk body of the collector disk is a circular disk body with a thickness not greater than 1 mm.
  • At least four liquid seepage holes are evenly distributed along the circumference of the circular disk near the edge.
  • the seepage holes are strip-shaped or circular seepage holes.
  • the conductive connecting piece is arranged between the pole and the area of the current collecting plate which is inconvenient to be welded.
  • the conductive connecting piece is an ultra-high conductive silica gel sheet, which has the same shape and size as the end face of the pole.
  • the collecting plate is made of aluminum or copper.
  • This application provides a conductive connection structure of a large-capacity battery, which is used to realize the electrical connection between the pole tab and the pole post.
  • a conductive connecting piece is added to the part that cannot be welded between the current collecting plate and the lug collecting plate, and the conductive connecting piece is a plane conductive piece.
  • the conductive connecting sheet is in the shape of a sheet with a thickness not greater than 3mm.
  • the conductive connecting piece is placed in the non-weldable area between the tab current collecting plate and the pole post current collecting plate, and the area is equal to the area of the non-weldable area.
  • the conductive connecting piece is made of metal or non-metal conductive material.
  • the material of the conductive connecting sheet is one or more of silver sheet, copper sheet, nickel sheet, aluminum sheet, graphite sheet, silver foam, copper foam, aluminum foam, nickel foam and graphite wool.
  • the conductive connecting sheet is silver sheet, copper sheet, silver foam or copper foam.
  • the present application provides a current collecting plate for a large-capacity battery.
  • the collecting plate is radially spaced along the circumference with a plurality of side strips, the current collecting plate is welded to the conductive connecting piece, and the multiple side strips can be turned upwards. Fold and connect with the pole, the conductive connecting piece is a plane conductive piece.
  • the plurality of side strips are evenly distributed rectangular side strips.
  • the collecting plate is circular, and a plurality of seepage grooves are evenly distributed along the circumference near the edge, and the thickness of the collecting plate is not greater than 1 mm.
  • the present application also provides a conductive connection structure for a large-capacity battery, including a pole, the aforementioned current collecting plate, a conductive connection piece, an insulating washer and a fastener.
  • seepage grooves with the same position and size are provided on the conductive connecting piece and the collecting plate.
  • the shaft of the pole is provided with an axial positioning ring, and the positioning ring is located under the insulating gasket under the upper cover of the battery when assembled.
  • the collecting plate is circular, and there are four seepage grooves evenly distributed along the circumference near the edge, and the thickness of the collecting plate is not greater than 1mm; one side of the collecting plate is first welded with the pole piece of the winding core, Solder with conductive lugs.
  • the conductive connecting piece is circular, the diameter is the same as that of the current collecting plate, the conductive connecting piece is provided with a seepage groove, the size and position of which are the same as the liquid seepage groove on the collecting plate, and the thickness of the conductive connecting piece is not greater than 1mm ;
  • the conductive connecting piece is first welded with the bottom surface of the pole, and then welded with the current collecting plate.
  • the current collecting plate and the conductive connecting piece are evenly coated with conductive glue on the surface of the inconvenient welding area below the projected surface of the pole, which can increase the flow area and ensure the contact between the current collecting plate and the conductive connecting piece.
  • the insulating gasket is a hollow cylinder with flanging, the height is half of the thickness of the battery cover, and they are respectively located on the upper and lower sides of the battery cover.
  • the fasteners are two fastening bolts, which respectively fix the pole and the battery cover from the upper and lower surfaces of the battery cover.
  • the material of the pole, the current collecting plate and the conductive connecting piece is aluminum or copper.
  • the present application also provides a conductive connection structure for a large-capacity battery, including a lower pole insert, an upper pole insert, an insulating gasket, a conductive connecting piece, a current collecting plate, and an insulating connector.
  • the bottom of the component is provided with a conductive plate, and the conductive plate is welded to the conductive connecting piece, and the conductive connecting piece is welded to the current collecting plate.
  • the pole body of the pole lower insert is provided with a positioning plate, and four positioning holes are provided on it.
  • the upper pole insert is in the shape of a ring, and is provided with positioning holes with the same position, diameter and number as the lower insert.
  • the conductive connecting piece is semicircular, and the upper and lower sides of the conductive connecting piece are respectively welded to the pole conductive plate and the current collecting plate.
  • the current collecting plate is semicircular, and the upper and lower sides of the current collecting plate are respectively welded to the conductive connecting piece and the winding core pole piece.
  • the surface where the conductive connecting piece and the current collecting plate are welded to each other is evenly coated with conductive glue on the contact surface of the inconvenient welding area below the projection surface of the pole conductive plate, which can increase the flow area and ensure the current collecting plate and the current collecting plate.
  • Good electrical conductivity between the contact surfaces of the conductive connecting pieces; furthermore, conductive connecting pieces can also be arranged at corresponding positions to achieve the same purpose.
  • the insulating washer has positioning holes, and the insulating washer is arranged on both sides of the battery cover.
  • the material of the lower pole insert, the upper pole insert, the conductive connecting piece and the current collecting plate is aluminum or copper.
  • the diameter of the conductive plate is larger than that of the pole body, so as to increase the welding area.
  • This application provides a conductive connection piece, pole, current collecting plate and conductive connection structure of a large-capacity battery, which maximizes the contact area between the pole and the tab, and ensures the connection reliability of each connection of the pole , suitable for high-current charging and discharging of large-capacity batteries.
  • This application provides a conductive connection piece, pole, current collecting plate and conductive connection structure of a large-capacity battery.
  • the structure is simple, the components are simple and easy to process, and the welding is convenient. efficient.
  • the multi-faceted welding of the current collecting plate and the pole can be realized, which can increase the flow area, and at the same time, it is inconvenient to connect the bottom surface of the pole and the current collecting plate.
  • the welding part is provided with a superconducting silica gel sheet, which can also increase the over-current area, so that the over-current requirement of the large-capacity battery can be met.
  • the pole has a pole current collecting plate
  • the tab has a tab current collecting plate. Since the pole is very thick, the connection between the pole and the pole current collecting plate and the tab current collecting plate cannot be welded.
  • the non-solderable part between the column collector plate and the tab collector plate generates heat due to poor contact, which maximizes the contact area between the pole and the tab, ensures the connection reliability of each connection of the pole, and is suitable for large-capacity batteries high current charge and discharge.
  • This application provides a conductive connection structure.
  • the rectangular side strips of the collector plate increase the contact flow area between the pole and the current collector, which can increase the flow area of the pole and meet the high-current charge and discharge of the battery. It can maximize the length of the battery winding core, which is beneficial to improve the capacity and energy density of the battery.
  • applying conductive glue to the parts where the conductive connecting piece and the current collecting plate are inconvenient to be welded can also increase the over-current area, which can meet the needs of large-capacity batteries. Core overcurrent requirements.
  • This application provides a conductive connection structure.
  • a conductive plate is provided at the end of the lower insert of the pole, and its diameter is larger than that of the pole body, which increases the welding area; at the same time, a conductive connecting piece and a current collecting plate are provided , the thickness of the two meets the welding requirements, and can meet the flow area requirements of large-capacity batteries.
  • the pole connection structure of the present application increases the contact area between the pole, the connector and the current collecting plate, and is suitable for high-current charging and discharging of a large-capacity battery. At the same time, the pole connection structure maximizes the length of the winding core in the casing, which is beneficial to increase the capacity and density of the battery.
  • FIG. 1 is a schematic structural view of the insert on the pole of the pole of the large-capacity battery of Example 1;
  • Fig. 2 is the structural schematic diagram of the insulating spacer of the pole of the large-capacity battery of embodiment 1;
  • Fig. 3 is a schematic structural view of the lower insert of the pole of the pole of the large-capacity battery in Example 1;
  • Example 4 is a schematic structural view of the conductive connecting piece of the pole of the large-capacity battery in Example 1;
  • Fig. 5 is an installation diagram of the conductive connecting piece, the lower insert of the pole, and the battery core in Example 1;
  • Fig. 6 is a diagram of the completion of the installation of the electric core, the lower pole insert and the conductive connecting piece of embodiment 1;
  • Example 7 is a general assembly diagram of the pole of the large-capacity battery and the upper battery cover of the battery cell in Example 1;
  • Example 8 is a schematic structural view of the insert on the pole of the pole of the large-capacity battery in Example 2;
  • Fig. 9 is a schematic structural diagram of the insulating gasket of the pole of the large-capacity battery in Example 2;
  • Fig. 10 is a schematic structural diagram of the insert under the pole of the pole of the large-capacity battery in Example 2;
  • Fig. 11 is a schematic diagram of the welding structure between the pole lower insert and the lower insert collector plate in Example 2;
  • Fig. 12 is a schematic diagram of the welding structure of the lower insert current collecting plate and the lug current collecting plate with multi-layer conductive connecting pieces in embodiment 2;
  • Fig. 13 is a diagram of completion of the installation of poles in the poles of the large-capacity battery in embodiment 2;
  • Example 14 is an overall schematic diagram of the conductive connection structure of the large-capacity battery in Example 3.
  • Example 15 is an exploded view of the conductive connection structure of the large-capacity battery in Example 3.
  • Fig. 16 is a schematic diagram of the current collecting plate structure of the conductive connection structure of the large-capacity battery in embodiment 3;
  • Fig. 17 is a schematic diagram of the second embodiment of the collector plate structure
  • Fig. 18 is a schematic diagram of the third structure of the collecting plate in embodiment 3.
  • FIG. 19 is a schematic diagram of a conductive connection structure of a large-capacity battery in Example 3.
  • Example 20 is a second schematic diagram of the conductive connection structure of the large-capacity battery in Example 3.
  • FIG. 21 is a schematic diagram of a pole with a collector plate in Embodiment 4.
  • Fig. 22 is a schematic diagram of a winding core with a lug collecting plate in embodiment 4.
  • Fig. 23 is a schematic diagram of the conductive connecting sheet in embodiment 4.
  • Fig. 24 is a position diagram of the conductive connecting piece and the tab current collecting plate in embodiment 4.
  • Fig. 25 is a schematic diagram of welding installation of a pole with a current collecting plate, a conductive connecting piece, and a tab with a current collecting plate in embodiment 4;
  • Fig. 26 is the completion diagram of pole installation in embodiment 4.
  • FIG. 27 is an overall schematic diagram of the conductive connection structure of the large-capacity battery in Example 5.
  • Figure 29 is a schematic structural view of the pole in Example 5.
  • Fig. 30 is a schematic diagram of the structure of the collector plate before welding in Example 5.
  • Fig. 31 is a schematic diagram of the structure of the current collector plate after welding in Example 5.
  • Figure 33 is a schematic structural view of an insulating gasket in Example 5.
  • Example 34 is an overall schematic diagram of the conductive connection structure of the large-capacity battery in Example 6;
  • 35 is a schematic structural view of the conductive connection structure of the large-capacity battery in Example 6;
  • Fig. 36 is a schematic diagram of the structure of the lower insert of the pole in Example 6;
  • Fig. 37 is a schematic diagram of the structure of the insulating washer in the sixth embodiment.
  • the conductive connecting sheet 14 of this embodiment is circular and can be folded, and a rectangular connection grid of equal width and equal distance is provided in the middle along the central line.
  • the pole of the large-capacity battery in this embodiment includes an upper pole insert 11 , an insulating gasket 12 , a lower pole insert 13 , a conductive connecting piece 14 and an insulating rivet 16 .
  • FIG. 5 shows the assembly structure of the conductive connecting piece 14 , the lower pole insert 13 and the battery winding core 15 .
  • the pole lower insert 13 and the half surface of the grid side of the conductive connecting piece 14 are fully welded by laser to ensure the maximum contact surface between the pole and the conductive connecting piece.
  • the conductive connecting piece 14 After welding, the conductive connecting piece 14 is bent 90 degrees, and the pole The insert under the column faces outward, and the other half of the conductive connecting piece 14 is laser-welded with the lug collector plate of the winding core 15, and then the conductive connecting piece 14 is bent as shown in Figure 6. Compression welding or conductive glue can be added to maximize the conductive area and conductive capacity of the conductive connection piece.
  • the pole of the battery, the pole of this large-capacity battery maximizes the connection cross-sectional area of the pole and the tab, ensures the connection reliability of each connection of the pole, and is suitable for high-current charging and discharging of large-capacity batteries.
  • the conductive connecting sheet of this embodiment is composed of multilayer metal connecting sheets 26 , which can be folded after welding.
  • the pole of the large-capacity battery of this embodiment includes an upper pole insert 21, an insulating gasket 22, a lower insert collector plate 24, a multi-layer metal connection sheet 26, and a pole under the pole. Inserts 23 and insulating rivets 27.
  • the lower insert collecting plate 24 is welded on the bottom round table of the pole lower insert 23 to ensure that the pole lower insert 23 is welded at the center of the chassis of the conductive connecting piece, the welding area is maximized, and the contact surface full contact.
  • the lug collector plate 25 of the winding core and the lower insert collector plate 24 of the welded pole lower insert 23 are placed side by side on a plane, and the multi-layer 0.5mm Thick metal connecting sheets 26 are layered and welded in sequence from short to long tab current collecting plate 25 and lower insert collecting plate 24, using multi-layer metal connecting sheets 26 to connect the tab current collecting plate 25 and the pole lower insert set
  • the flow plate 24 can maximize the cross-sectional area of the connection between the two, and ensure that a large current can be smoothly transmitted to the pole through the multi-layer metal connection sheet.
  • the multi-layer metal connecting sheet 26 After the multi-layer metal connecting sheet 26 is welded, it needs to be folded into an M shape. After folding, it is ensured that the multi-layer metal connecting sheet is completely included in the upward projection surface of the core.
  • this embodiment provides a conductive connection structure for a large-capacity battery, including a current collecting plate 33 and a conductive connecting piece 32, the conductive connecting piece 32 is a plane conductive plate, and the current collecting plate 33 includes a circular plate body 331 and a rectangular, circular or square encapsulation 332 disposed on the circular disc body 331 , and the conductive connecting sheet 32 is disposed within the rectangular, circular or square encapsulation 332 .
  • the bottom surface of the collector plate 33 is welded with the tab 34 , and the wrapping is welded with the pole body of the pole.
  • the wrapping 332 has the same shape and size as the pole 31 , that is to say, the wrapping 332 matches the body of the rectangular, circular or square pole 31 .
  • the height of the above-mentioned hemming is not less than 5mm, and the thickness is not more than 1mm.
  • the disk body 331 of the collector disk 33 is a circular disk body with a thickness not greater than 1 mm.
  • the collector plate 33 is circular and has a thickness not greater than 1 mm.
  • the circular plate body 331 has at least four seepage holes 333 uniformly distributed along the circumference near the edge.
  • the above-mentioned conductive connecting piece 32 is an ultra-high conductive silica gel sheet, which is rectangular, round or square in shape, and has the same size as the end face of the pole; the bottom surface of the current collecting plate 33 is welded to the tab 34, and its rectangular, round or square wrapping Welded with the pole column body; the surface of the pole column 31 and the current collecting plate 33 welded to each other is provided with a conductive connecting piece 32 on the contact surface of the inconvenient welding area below the projected surface of the pole end surface, that is, on the area surrounded by the wrapping edge.
  • the conductive connecting piece is closely combined with the end surface of the pole 31.
  • the material of the collecting plate 33 is preferably aluminum or copper.
  • the current collecting plate 33 is first welded to the tab 34 above the winding core 35, and then the current collecting plate 33 is welded to the pole 31.
  • the rectangular, circular or square shape on the current collecting plate 33 The wrapping 332 is welded with the pole 31 column body, and the surface of the pole 31 and the pole current collector 33 is welded to each other.
  • the contact surface of the inconvenient welding area below the projection surface of the pole end is provided with a conductive connecting piece 32, that is, in the wrapping
  • the area surrounded by 332 is provided with a conductive connecting piece 32 , which is closely combined with the end surface of the pole 31 .
  • the pole has a pole current collecting plate
  • the pole ear has a pole ear current collecting plate
  • the conductive connecting piece 43 is placed on the pole.
  • press the pole collector plate on the pole lug collector plate 42 align the two collector plates, and use a laser welding machine to weld the other poles except the pole.
  • the post collector plate is welded to the lug collector plate to ensure that the conductive connecting piece is pressed tightly after welding.
  • the insulating gasket 45 is inserted into the battery upper cover 47, and then the insulating gasket 45 and each mounting hole of the battery upper cover 47 Alignment, put the battery cover 47 covered with the insulating gasket 45 into the pole 41 with the current collecting plate in Fig. 5, and align the installation holes.
  • the conductive connection structure of the large-capacity battery maximizes the connection cross-sectional area of the pole and the tab, ensures the connection reliability of each connection of the pole, and is suitable for the high current of the large-capacity battery Discharge.
  • the conductive connection structure of the large-capacity battery of this embodiment includes a pole 54, a current collector 58, a conductive connection piece 57, a first insulating washer 52 and a second insulating washer 55, a first tight Firmware 51 and second fastener 56, above-mentioned collecting plate 58 is circular, and collecting plate 58 distributes a plurality of side strips radially along the circumference, and collecting plate 58 is welded with conductive connecting piece 57, and multiple side strips Fold up and connect with pole 54.
  • the above-mentioned conductive connecting piece 57 is circular, and its diameter is the same as that of the collecting plate 58.
  • the conductive connecting piece is provided with a seepage tank, the size and position of which are the same as those on the collecting plate 58, and the thickness of the conductive connecting piece 57 is not greater than 1 mm; the conductive connecting piece 57 is first welded to the bottom surface of the pole, and then welded to the current collecting plate 58.
  • the shaft of the pole 54 is provided with an axial positioning ring 541, and the positioning ring 541 is located under the insulating gasket 55 on the lower surface of the battery cover 53 when assembled, so as to ensure the insulation between the pole and the battery cover.
  • the insulating washer 52 and the insulating washer 55 are hollow cylinders with flanging, the height is half of the thickness of the battery cover 53, and are respectively located on the upper and lower sides of the battery cover.
  • the first fastener 51 and the second fastener 56 respectively fix the pole and the battery upper cover from the upper and lower surfaces of the battery upper cover.
  • the surfaces of the current collecting plate 58 and the conductive connecting piece 57 are welded to each other, and the conductive glue is evenly applied to the inconvenient welding area below the projected surface of the pole 54, so as to ensure the conductivity between the two contact surfaces.
  • conductive connecting pieces may also be provided at corresponding positions to achieve the same purpose.
  • the axial positioning ring 541 of the pole post 54 is located under the upper battery cover 53 , and is insulated from the upper battery cover 53 by the first insulating washer 52 and the second insulating washer 55 , and is insulated from the upper battery cover 53 by the first fastener 51 and
  • the second fastener 56 is fixedly connected with the battery upper cover 53 .
  • the conductive connecting piece 57 is first welded to the bottom surface of the pole 54, and the current collecting plate 58 is first welded to the pole piece, and then welded to the conductive connecting piece 57.
  • connection between the pole and the current collecting plate is completed.
  • This connection structure increases the welding area between the current collecting plate and the pole, that is, adding multiple rectangular side strips on the current collecting plate, and the rectangular side strips are folded up. Welding with the pole body improves the conduction capacity of the pole, which is suitable for high-current charging and discharging of the battery.
  • the pole connection structure is simple and easy to process, and the welding is convenient, and is suitable for the battery cell connection of a large-capacity battery.
  • the conductive connection structure of the large-capacity battery in this embodiment includes a lower pole insert 65, an upper pole insert 62, an insulating gasket 63, a conductive connecting piece 66, a current collecting plate 67 and an insulating connecting piece 61 , wherein, the bottom of the lower pole insert 65 is provided with a conductive plate 653, the conductive plate 653 is welded to the conductive connecting piece 66, and the conductive connecting piece 66 is welded to the current collecting plate 67.
  • a positioning disc 652 is provided on the column body of the lower pole insert, and four positioning holes 654 are provided on the positioning disc 652 .
  • the upper insert of the pole is in the shape of a ring, and is provided with positioning holes with the same position, aperture and number as the lower insert.
  • the conductive connecting piece 66 is semicircular, and the upper and lower surfaces of the conductive connecting piece are respectively welded to the conductive plate 653 and the current collecting plate 67 .
  • the current collecting plate 67 is semicircular, and the upper and lower sides of the current collecting plate are respectively welded to the conductive connecting piece 66 and the pole piece of the winding core 68 .
  • conductive glue is evenly applied on the contact surface of the inconvenient welding area below the projection surface of the conductive plate 653 of the pole.
  • conductive connecting pieces may also be provided at corresponding positions to achieve the same purpose.
  • the insulating washer 63 As shown in FIG. 37 , there are positioning holes on the insulating washer 63 , and the insulating washer is arranged on both sides of the battery upper cover 64 .
  • the conductive connection structure of the large-capacity battery in this embodiment completes the connection between the pole post and the current collecting plate through the following steps: the conductive plate 653 of the lower insert 65 of the pole post is laser welded to the conductive connecting piece 66, and the current collecting plate 67 is connected to the negative plate. 69 welding, apply conductive glue evenly on the unwelded side of the conductive connecting piece 66 and the current collecting plate 67 or set the conductive connecting piece, then weld the conductive connecting piece 66 and the current collecting plate 67, and then nest the insulating gasket 62 on the battery On the cover 64 , the upper pole insert 62 and the lower pole insert 65 are combined with the battery upper cover through insulating rivets 61 .
  • This structure can greatly improve the overcurrent capacity of the pole, and can be used for welding large-capacity battery cells.

Abstract

本申请涉及一种大容量电池的导电连接片、极柱、集流盘及导电连接结构，该导电连接片为平面导电片或能够折叠的金属导电片，所述导电连接片分别与极柱、极耳或集流盘连接。该导电连接片通过增大极柱与集流盘的接触面积，实现集流盘与极柱的可靠连接，同时大幅提升极柱的过流面积，实现电池的大电流充放电。同时，导电连接结构仅需较少的零部件即可实现极耳与极柱的连接，同时还满足大电流通过能力。此外，还可实现集流盘与极柱的可靠连接，同时可大幅提升过流面积。

Description

大容量电池的导电连接片、极柱、集流盘及导电连接结构 技术领域
本申请涉及电池领域，具体涉及一种大容量电池的导电连接片、极柱、集流盘及导电连接结构。
背景技术
锂离子电池由于具有比能量高、充放电寿命长、使用温度范围宽等特点而得到广泛的应用。传统的锂电池设计采用钢壳、铝塑膜或塑壳等设计，电流的引出结构按小电流充放设计，该设计难以承载大电流充放电，影响锂电池的使用效果和负载需求。电池的极柱是电池电流的输出端，通过极柱与卷芯连接将电池的电流导出。目前锂电池行业圆柱电池极柱与内部电芯的电流传递大都需要极板、转接板等零件转接传递，零件较多、焊接工序冗长、内部空间少，且电池的容量不高，市场上已知的圆柱电池最大容量不超过100Ah。
大容量电池要求有极柱及其连接件有足够大的过流面积，而过流面积与连接件的尺寸和厚度相关，当连接件厚度超过1mm时，当前的激光焊接工艺就不能保证极耳与集流盘及连接件的焊接质量，并且大功率的激光焊接产生的高温会破坏极片结构，甚至引起电芯热失控。
现有锂电池最大容量的方形电池为400Ah，而最大容量的圆柱电池不大于100Ah，电池的极柱和极耳间通过薄片连接件连接，这种结构不能满足大容量电池充放电的需求。如果使用在大容量电池上，在电池充放电电流大于连接片的载流量时，连接片很容易发热、甚至烧坏，很容造成电池的损坏或者热失控。如果设计一款容量大于1000Ah的电池，极柱和极耳的连接则成为了最大的问题，大容量电池极柱集流盘、极耳集流盘需完全连接，但在焊接时，极柱集流盘的极柱垂直向下投影由于极柱的影响无法与极耳集流盘焊接，这样电流的传输面就小了很多，不良的接触会导致接触面发热，影响了大容量电池的充放电。
发明内容
为解决上述问题，本申请提出了一种大容量电池的导电连接片、极柱、集流盘及导电连接结构。该导电连接片通过增大极柱与集流盘的接触面积，实现集流盘与极柱的可靠连接，同时大幅提升极柱的过流面积，实现电池的大电流充放电，适用于大容量电池。同时，导电连接结构仅需较少的零部件即可实现极耳与极柱的连接，同时还满足大电流通过能力。此外，还可实现集流盘与极柱的可靠连接，同时可大幅提升过流面积。
本申请提供一种大容量电池的导电连接片，所述导电连接片为平面导电片或能够折叠的导电片，所述导电连接片分别与极柱、极耳或集流盘连接。
优选的，所述导电连接片中部沿中心线位置设有等宽等距的矩形连接格栅，所述导电连接片的格栅两侧分别与极柱以及极耳或极耳集流盘连接。
优选的，所述导电连接片同一面的格栅两侧，分别与极柱以及极耳或极耳集流盘连接。
优选的，所述导电连接片能够沿中心线位置折叠。
优选的，所述导电连接片的厚度不大于3mm。
优选的，当大容量电池中设置极耳集流盘时，格栅两侧形状大小与极耳集流盘相同。
优选的，所述导电连接片由多个长短不同的金属连接薄片组成，所述金属连接薄片焊接好后能够折叠。
优选的，所述金属连接薄片焊接后折叠成M型。
优选的，所述金属连接薄片折叠后金属连接薄片完全包括在卷芯的顶面向上投射面内。
优选的，金属连接薄片厚度不大于2mm，不少于2层。
本申请的另一方面提供一种大容量电池的极柱，包括极柱及前述的导电连接片，所述极柱包括极柱上镶件、绝缘垫片、极柱下镶件和绝缘连接件，导电连接片同面的一侧居中焊接极柱，焊好后极柱向外沿格栅垂直中线折弯90度， 另一侧焊接极耳集流盘，再将未焊接面对折后上下两层压紧焊接，或者在上下两层间加入导电胶连接。
优选的，所述极柱上镶件为环状结构，环上可开多个均匀分布的安装孔，用于与极柱下镶件进行固定。
优选的，所述绝缘垫片为硅橡胶垫圈，可卡放于电池上盖极柱孔边缘处，对极柱上镶件与电池上盖顶面、极柱下镶件与极柱孔侧面、极柱下镶件与电池上盖底面进行绝缘，所述绝缘垫片的上、下面带有与极柱上镶件相同的安装孔。
优选的，所述极柱下镶件主体为柱状结构，腰中部带有与极柱上镶件相同的环状结构，环上带有与极柱上镶件分布、大小相同的安装孔，底部带有圆台状的焊接底板。
优选的，所述绝缘连接件为铆钉，铆钉头带有绝缘柱，保证铆接后，铆钉不与电池上盖接触。
优选的，所述导电连接片、极柱上镶件、极柱下镶件材质为铜或铝或带有镀层的铜或铝。
本申请提供另一种大容量电池的极柱，其包括极柱和前述的导电连接片，所述极柱包括极柱上镶件、绝缘垫片、极柱下镶件、下镶件集流盘和绝缘连接件，所述导电连接片的不同长度的金属连接薄片由短到长，一端依次焊接在极耳集流盘上，另一端依次焊接在极柱下镶件集流盘上，每个金属连接薄片的焊接位置从内到外平行并列但不重叠。
优选的，所述极柱上镶件为环状结构，环上可开多个均匀分布的安装孔，用于与极柱下镶件进行固定。
优选的，所述绝缘垫片为硅橡胶垫圈，可卡放于电池上盖极柱孔边缘处，对极柱上镶件与电池上盖顶面、极柱下镶件与极柱孔侧面、极柱下镶件与电池上盖底面进行绝缘，所述绝缘垫片的上、下面带有与极柱上镶件相同的安装孔。
优选的，所述极柱下镶件主体为柱状结构，腰中部带有与极柱上镶件相同的环状结构，环上带有与极柱上镶件分布、大小相同的安装孔，底部带有圆台状的焊接底板。
优选的，所述的下镶件集流盘形状大小与极耳集流盘相同，居中焊接在极柱下镶件底部圆台上。
优选的，金属连接薄片焊接好后，需进行折叠，折叠成M型或其它形状，折叠后金属连接薄片完全包括在卷芯的顶面向上投射面内。
优选的，所述绝缘连接件为铆钉，铆钉头带有绝缘柱，保证铆接后，铆钉不与电池上盖接触。
优选的，所述导电连接片、金属连接薄片、极柱上镶件、极柱下镶件材质为铜或铝或带有镀层的铜或铝。
本申请提供一种大容量电池的导电连接结构，包括集流盘和导电连接片，所述导电连接片为平面导电片，所述集流盘包括盘体和设置在所述盘体上的包边，所述导电连接片设置在所述包边内；其中，所述包边与极柱的形状、大小相同。
优选的，所述集流盘的底面与极耳焊接，所述包边与极柱柱身焊接。
优选的，所述包边为矩形、圆形或正方形，且包边的高度不低于5mm，厚度不大于1mm。
优选的，所述集流盘的盘体为圆形盘体且厚度不大于1毫米。
优选的，所述圆形盘体沿圆周靠近边沿位置均布有至少四个渗液孔。
优选的，所述渗液孔为条形或圆形渗液孔。
优选的，所述导电连接片设置在极柱与集流盘不便焊接的区域之间。所述导电连接片为超高导电硅胶片，与极柱端面的形状、大小相同。
优选的，所述集流盘的材质为铝或铜。
本申请提供一种大容量电池的导电连接结构，用于实现极耳与极柱的电连接，所述极柱带有极柱集流盘，极耳带有极耳集流盘，在极柱集流盘与极耳集流盘间不能焊接的部分增加了导电连接片，所述导电连接片为平面导电片。
优选的，所述导电连接片为薄片状，厚度不大于3mm。
优选的，所述导电连接片置于极耳集流盘与极柱集流盘间的不能焊接区域，面积等于不能焊接区域面积。
优选的，所述导电连接片为金属或非金属导电材料。
优选的，所述导电连接片的材质为银片、铜片、镍片、铝片、石墨片、泡沫银、泡沫铜、泡沫铝、泡沫镍和石墨棉的一种或多种。
优选的，所述导电连接片为银片、铜片、泡沫银或泡沫铜。
本申请提供了一种大容量电池的集流盘，所述集流盘沿圆周径向间隔分布多个边条，所述集流盘与导电连接片焊接，所述多个边条能够向上翻折并与极柱连接，所述导电连接片为平面导电片。
优选地，所述多个边条为均匀分布的矩形边条。
优选地，所述集流盘为圆形，沿圆周靠近边沿位置均布有多个渗液槽，集流盘厚度不大于1mm。
本申请同时提供了一种大容量电池的导电连接结构，包括极柱、前述的集流盘、导电连接片、绝缘垫圈和紧固件。
优选地，所述导电连接片和集流盘上均设有位置、大小相同的渗液槽。
所述极柱柱身部设有轴向定位环，所述定位环装配时位于电池上盖下方的绝缘垫圈之下。
优选的，所述集流盘为圆形，沿圆周靠近边沿均布有4个渗液槽，集流盘厚度不大于1mm；所述集流盘一面先与卷芯的极片焊接，另一面与导电连接片焊接。
优选的，所述导电连接片为圆形，直径与集流盘直径相同，导电连接片上设有渗液槽，大小、位置与集流盘上的渗液槽相同，导电连接片厚度不大于1mm；所述的导电连接片先和极柱底面焊接，再与集流盘焊接。
优选的，所述集流盘和导电连接片在极柱的投影面以下的不方便焊接区域的面上均匀涂抹有导电胶，可增加过流面积，确保集流盘和导电连接片接触之间良好的导电性；进一步优选的，也可在相应位置设置导电连接片，达到同样目的。
优选的，所述绝缘垫圈为带翻边的空心圆柱形，高度为电池上盖厚度的一半，分别位于电池上盖的上下面。
优选的，所述紧固件为两个紧固螺栓，分别从电池上盖的上下表面将极柱与电池上盖固定。
优选的，所述极柱、集流盘和导电连接片材质为铝或铜。
本申请同时提供了一种大容量电池的导电连接结构，包括极柱下镶件、极柱上镶件、绝缘垫圈、导电连接片、集流盘和绝缘连接件，所述的极柱下镶件的底部设有导电盘，所述的导电盘与导电连接片焊接，所述的导电连接片与集流盘焊接。
优选的，所述的极柱下镶件的柱身设有定位盘，其上设有4个定位孔。
优选的，所述的极柱上镶件为圆环状，设有与下镶件位置、孔径及数量相同的定位孔。
优选的，所述的导电连接片为半圆形，导电连接片的上下面分别与极柱导电盘和集流盘焊接。
优选的，所述的集流盘为半圆形，集流盘的上下面分别与导电连接片和卷芯极片焊接。
优选的，所述的导电连接片和集流盘相互焊接的面，在极柱导电盘投影面以下不便焊接区域的接触面上均匀涂抹有导电胶，可增加过流面积，确保集流盘和导电连接片接触面之间良好的导电性；进一步地，也可在相应位置设置导电连接片，达到同样目的。
优选的，所述的绝缘垫圈上有定位孔，绝缘垫圈设在电池上盖两侧。
优选的，所述的极柱下镶件、极柱上镶件、导电连接片和集流盘的材质为铝或铜。
优选的，所述导电盘的直径大于极柱本体的直径，用于增大焊接面积。
与现有技术相比，本申请包括如下有益效果：
1.本申请提供了一种大容量电池的导电连接片、极柱、集流盘及导电连接结构，最大化了极柱和极耳的接触面积，确保了极柱各个连接处的连接可靠性，适合于大容量电池的大电流充放电。
2.本申请提供了一种大容量电池的导电连接片、极柱、集流盘及导电连接结构，其结构简单，部件简单易加工，焊接方便，可以由下至上依次操作，工艺简单，操作效率高。通过在集流盘与极柱焊接的面上设置矩形、圆形或正方 形包边，可实现集流盘与极柱的多面焊接，可提高过流面积，同时在极柱底面与集流盘不便焊接的部位设置有超导电硅胶片，也可增加过流面积，这样就可满足大容量电芯的过流要求。
3.本申请提供的大容量电池的导电连接片、极柱、集流盘及导电连接结构中，极柱带有极柱集流盘，极耳带有极耳集流盘，由于极柱很厚，极柱与极柱集流盘连接处和极耳集流盘无法焊接，本申请通过在极柱集流盘与极耳集流盘间不能焊接的部分增加了导电连接片，避免了极柱集流盘和极耳集流盘间的不能焊接部分的接触不良而发热，最大化了极柱和极耳的接触面积，确保了极柱各个连接处的连接可靠性，适合于大容量电池的大电流充放电。
4.本申请提供了一种导电连接结构，集流盘的矩形边条增加了极柱与集流盘的接触过流面积，可提高极柱的过流面积，可满足电池大电流充放电，能最大程度提升电池卷芯的长度，有利于提升电池的容量和能量密度，同时导电连接片与集流盘不便焊接的部位涂抹导电胶焊接也可增加过流面积，这样就可满足大容量电芯的过流要求。
5.本申请提供了一种导电连接结构，在极柱下镶件的末端设有导电盘，其直径大于极柱本体的直径，增大了焊接面积；同时设有导电连接片和集流盘，二者的厚度满足焊接要求，可满足大容量电池的过流面积要求。本申请的极柱连接结构增大了极柱与连接件及集流盘的接触面积，适合于大容量电池的大电流充放电。同时，该极柱连接结构将壳体内卷芯的长度最大化，有利于提升电池的容量和密度。
本申请的其它优点、目标和特征将部分通过下面的说明体现，部分还将通过对本申请的研究和实践而为本领域的技术人员所理解。
附图说明
构成本申请的一部分的说明书附图用来提供对本申请的进一步理解，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。
图1为实施例1的大容量电池的极柱的极柱上镶件结构示意图；
图2为实施例1的大容量电池的极柱的绝缘垫片结构示意图；
图3为实施例1的大容量电池的极柱的极柱下镶件结构示意图；
图4为实施例1的大容量电池的极柱的导电连接片结构示意图；
图5为实施例1的导电连接片与极柱下镶件、电池卷芯安装图；
图6为实施例1的电芯、极柱下镶件和导电连接片安装完成图；
图7为实施例1的大容量电池的极柱与电芯电池上电池上盖总装图；
图8为实施例2的大容量电池的极柱的极柱上镶件结构示意图；
图9为实施例2的大容量电池的极柱的绝缘垫片结构示意图；
图10为实施例2的大容量电池的极柱的极柱下镶件结构示意图；
图11为实施例2中极柱下镶件与下镶件集流盘焊接结构示意图；
图12为实施例2中下镶件集流盘与极耳集流盘用多层导电连接片焊接结构示意图；
图13为实施例2大容量电池的极柱中极柱安装完成图；
图14为实施例3中大容量电池的导电连接结构的整体示意图；
图15为实施例3中大容量电池的导电连接结构的爆炸图；
图16为实施例3中大容量电池的导电连接结构的集流盘结构示意图一；
图17为实施例3的集流盘结构示意图二；
图18为实施例3的集流盘结构示意图三；
图19为实施例3中大容量电池的导电连接结构示意图一；
图20为实施例3中大容量电池的导电连接结构示意图二；
图21为实施例4中带有集流盘的极柱示意图；
图22为实施例4中带有极耳集流盘的卷芯示意图；
图23为实施例4中导电连接片示意图；
图24为实施例4中导电连接片与极耳集流盘位置图；
图25为实施例4中带有集流盘的极柱、导电连接片、带有集流盘的极耳焊接安装示意图；
图26为实施例4中极柱安装完成图；
图27为实施例5中大容量电池的导电连接结构的整体示意图；
图28为实施例5中大容量电池的导电连接结构的爆炸图；
图29为实施例5中极柱的结构示意图；
图30为实施例5中焊接前的集流盘结构示意图；
图31为实施例5中焊接后的集流盘结构示意图；
图32为实施例5中导电连接片的结构示意图；
图33为实施例5中绝缘垫圈的结构示意图；
图34为实施例6中大容量电池的导电连接结构的整体示意图；
图35为实施例6中的大容量电池的导电连接结构的结构示意图；
图36为实施例6中极柱下镶件结构示意图；
图37为实施例6中绝缘垫圈结构示意图。
附图标记：11-极柱上镶件，12-绝缘垫片，13-极柱下镶件，14-导电连接片，15-电池卷芯，16-绝缘铆钉，17-电池上盖，21-极柱上镶件，22-绝缘垫片，23-极柱下镶件，24-下镶件集流盘，25-极耳集流盘，26-多层金属连接薄片，27-绝缘铆钉，28-电池上盖，31-极柱，32-导电连接片，33-集流盘，331-圆形盘体，332-包边，333-渗液孔，34-极耳，35-卷芯，41-带有集流盘的极柱，42-极耳集流盘，43-导电连接片，44-极柱上镶件，45-绝缘垫片，46-绝缘连接件，47-电池上盖，51-第一紧固螺件，52-第一绝缘垫圈，53-电池上盖，54-极柱，55-第二绝缘垫圈，56-第二紧固螺件，57-导电连接片，58-集流盘，61-绝缘连接件，62-极柱上镶件，63-绝缘垫圈，64-电池上盖，65-极柱下镶件，66-导电连接片，67-集流盘，68-卷芯，69-负极片，610-正极片，651-极柱本体，652-极柱定位盘，653-导电盘，654-定位孔
具体实施方式
下面将结合本申请中的附图，对本申请中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。
实施例1
如图4所示，本实施例的导电连接片14为圆形，且能够折叠，中部沿中心线位置设有等宽等距的矩形连接格栅。
如图1至图4所示，本实施例的大容量电池的极柱包括极柱上镶件11、绝缘垫片12、极柱下镶件13、导电连接片14和绝缘铆钉16。图5给出了导电连接片14和极柱下镶件13、电池卷芯15的装配结构。极柱下镶件13与导电连接片14格栅一侧的半面居中激光满焊，保证极柱和导电连接片的接触面最大化，焊好后，将导电连接片14折弯90度，极柱下镶件朝外，导电连接片14的另一半面再与卷芯15的极耳集流盘激光焊接，再将导电连接片14折弯成如图6所示，两个折弯面间可压紧焊接或加导电胶来最大化导电连接片的导电面积和导电能力。
如图7所示，为防止极柱在安装时和安装后与电池上盖接触，将绝缘垫片12，套入电池上盖17，再将绝缘垫片12和电池上盖17的各安装孔对准，将套好绝缘垫片12的电池上盖17套入图5中的极柱下镶件13，各安装孔对准。
将极柱上镶件11套入极柱下镶件13，与电池上盖17的安装孔对准，用绝缘铆钉16拉紧各安装孔，完成极柱装配，即可获得本申请的大容量电池的极柱，此大容量电池的极柱最大化了极柱和极耳的连接横截面面积，确保了极柱各个连接处的连接可靠性，适合于大容量电池的大电流充放电。
实施例2
如图12所示，本实施例的导电连接片由多层金属连接薄片26组成，焊接后能够折叠。
如图8至图12所示，本实施例的大容量电池的极柱包括极柱上镶件21、绝缘垫片22、下镶件集流盘24、多层金属连接薄片26、极柱下镶件23和绝缘铆钉27。
如图11所示，下镶件集流盘24焊接在极柱下镶件23的底部圆台上，保证极柱下镶件23焊接在导电连接片底盘中央处，焊接面积最大化，使得接触面完全接触。
如图12所示和图13所示，将卷芯的极耳集流盘25与焊好极柱下镶件23的下镶件集流盘24并列放在一个平面上，用多层0.5mm厚的金属连接薄片26分层从短 到长依次焊接极耳集流盘25与下镶件集流盘24，使用多层金属连接薄片26连接极耳集流盘25和极柱下镶件集流盘24，能最大化两者间的连接横截面面积，确保大电流能顺利通过多层金属连接薄片传递到极柱上。多层金属连接薄片26焊接好后，需进行折叠，折叠成M型，折叠后保证多层金属连接薄片完全包括在卷芯的顶面向上投射面内。
为防止极柱在安装时和安装后与电池上盖接触，将绝缘垫片22套入电池上盖28，各安装孔对准，再将套好绝缘垫片22的电池上盖28套入极柱下镶件23，各安装孔对准。将极柱上镶件21套入极柱下镶件23，与电池上盖28的安装孔对准，用绝缘铆钉27拉紧各安装孔，完成极柱装配，即可获得本申请的大容量电池的极柱，此大容量电池的极柱结构最大化了极柱和极耳的连接横截面面积，确保了极柱各个连接处的连接可靠性，适合于大容量电池的大电流充放电。
实施例3
如图14至图20所示，本实施例提供一种大容量电池的导电连接结构包括集流盘33和导电连接片32，导电连接片32为平面导电片，集流盘33包括圆形盘体331和设置在圆形盘体331上的矩形、圆形或正方形包边332，导电连接片32设置在矩形、圆形或正方形包边332内。集流盘33的底面与极耳34焊接，包边与极柱的柱身焊接。包边332与极柱31的形状、大小相同，也就是说，包边332与矩形、圆形或正方形极柱31的柱身相吻合。上述包边的高度不低于5mm，厚度不大于1mm。集流盘33的盘体331为圆形盘体且厚度不大于1毫米。集流盘33为圆形且厚度不大于1毫米，圆形盘体331沿圆周靠近边沿位置均布有至少四个渗液孔333。
上述导电连接片32为超高导电硅胶片，形状为矩形、圆型或正方形，与极柱端面的大小相同；集流盘33的底面与极耳34焊接，其矩形、圆形或正方形包边与极柱柱身焊接；极柱31和集流盘33相互焊接的面，在极柱端面投影面以下不便焊接区域的接触面设有导电连接片32，也就是在包边包围的面积上设导电连接片，并与极柱31的端面结合紧密。集流盘33的材质优选为铝或铜。
如图14至图20所示，先将集流盘33与卷芯35上方的极耳34焊接，再将集流盘 33与极柱31焊接，集流盘33上的矩形、圆形或正方形包边332与极柱31柱身焊接，极柱31和极集流盘33相互焊接的面，在极柱端面投影面以下不便焊接区域的接触面设有导电连接片32，也就是在包边332包围的面积上设导电连接片32，并与极柱31的端面结合紧密。
实施例4
如图21到图26所示，本实施例的大容量电池的导电连接结构中，极柱带有极柱集流盘，极耳带有极耳集流盘，将导电连接片43放在极耳集流盘42的几何中心位置，将带有极柱集流盘压紧在极耳集流盘42上，两个集流盘对准，用激光焊接机将除极柱处外的其它极柱集流盘与极耳集流盘焊接，保证焊接后导电连接片被压紧。
如图26所示，为防止极柱在安装时和安装后与电池上盖接触，将绝缘垫片45，套入电池上盖47，再将绝缘垫片45和电池上盖47的各安装孔对准，将套好绝缘垫片45的电池上盖47套入图5中的带有集流盘极柱41，各安装孔对准。
将极柱上镶件44套入带有集流盘极柱41，与电池上盖47的安装孔对准，用绝缘连接件46拉紧各安装孔，完成极柱装配，即可获得本申请大容量电池的导电连接结构，此大容量电池的导电连接结构最大化了极柱和极耳的连接横截面面积，确保了极柱各个连接处的连接可靠性，适合于大容量电池的大电流充放电。
实施例5
如图27至图33所示，本实施例的大容量电池的导电连接结构包括极柱54、集流盘58、导电连接片57、第一绝缘垫圈52和第二绝缘垫圈55、第一紧固件51和第二紧固件56，上述集流盘58为圆形，集流盘58沿圆周径向间隔分布多个边条，集流盘58与导电连接片57焊接，多个边条向上翻折并与极柱54连接。沿集流盘58的圆周靠近边沿均布有4个渗液槽，这样有利于电解液在卷芯均匀分布，集流盘厚度不大于1mm；集流盘一面先与卷芯的极片焊接，另一面与导电连接片 57焊接。
上述导电连接片57为圆形，直径与集流盘58直径相同，导电连接片上设有渗液槽，大小、位置与集流盘58上的渗液槽相同，导电连接片57的厚度不大于1mm；导电连接片57先和极柱底面焊接，再与集流盘58焊接。
上述极柱54柱身部设有轴向的定位环541，定位环541装配时位于电池上盖53的下表面的绝缘垫圈55下方，这样可保证极柱与电池上盖的绝缘。
上述绝缘垫圈52和绝缘垫圈55为带翻边的空心圆柱形，高度为电池上盖53厚度的一半，分别位于电池上盖的上下面。第一紧固件51和第二紧固件56分别从电池上盖的上下表面将极柱与电池上盖固定。其中集流盘58和导电连接片57相互焊接的面,在极柱54投影面以下不便焊接的区域均匀涂抹导电胶，可确保两者接触面之间的导电性。本实施例中，也可在相应位置设置导电连接片，达到同样目的。
如图28所示，极柱54轴向的定位环541位于电池上盖53下方，通过第一绝缘垫圈52和第二绝缘垫圈55与电池上盖53绝缘，并通过第一紧固件51和第二紧固件56与电池上盖53固定连接。导电连接片57先和极柱54底面焊接，集流盘58先与极片焊接，再与导电连接片57焊接，集流盘58与导电连接片57在极柱54投影面积以下不方便施焊的区域均匀涂抹导电胶，然后将上述两个部件从边沿焊接牢固，再将集流盘58圆周延伸的多个矩形边条向上翻折后与极柱54的柱身焊接牢固。通过以上步骤，完成了极柱与集流盘的连接，该连接结构通过增大集流盘与极柱的焊接面积，即在集流盘上增加多个矩形边条，矩形边条上折后与极柱柱身焊接，提高了极柱的导流能力，适合电池大电流充放电。该极柱连接结构简单易加工，施焊方便，适合大容量电池的电芯连接。
实施例6
如图34所示，本实施例的大容量电池的导电连接结构包括极柱下镶件65、极柱上镶件62、绝缘垫圈63、导电连接片66、集流盘67和绝缘连接件61，其中，极柱下镶件65的底部设有导电盘653，导电盘653与导电连接片66焊接，导电连 接片66与集流盘67焊接。极柱下镶件的柱身设有定位盘652，定位盘652上设有4个定位孔654。极柱上镶件为圆环状，设有与下镶件位置、孔径及数量相同的定位孔。
上述导电连接片66为半圆形，导电连接片的上下面分别与导电盘653和集流盘67焊接。集流盘67为半圆形，集流盘的上下面分别与导电连接片66和卷芯68的极片焊接。导电连接片66和集流盘67相互焊接的面，在极柱的导电盘653投影面以下不便焊接区域的接触面上均匀涂抹有导电胶。本申请中，也可在相应位置设置导电连接片，达到同样目的。
如图37所示，绝缘垫圈63上有定位孔，绝缘垫圈设在电池上盖64两侧。
本实施例中的大容量电池的导电连接结构通过以下步骤完成极柱与集流盘的连接：极柱下镶件65的导电盘653与导电连接片66激光焊接，集流盘67与负极片69焊接，在导电连接片66和集流盘67的未焊接一面均匀涂抹导电胶或设置导电连接片，再将导电连接片66和集流盘67焊接，然后将绝缘垫圈62嵌套于电池上盖64上，极柱上镶件62与极柱下镶件65通过绝缘铆钉61与电池上盖组合在一起。该结构可大幅提升极柱的过流能力，可用于大容量电池电芯的焊接。
最后应当说明的是：以上实施例仅用以说明本申请的技术方案而非对其限制，尽管参照上述实施例对本申请进行了详细的说明，所属领域的普通技术人员应当理解：依然可以对本申请的具体实施方式进行修改或者等同替换，而未脱离本申请精神和范围的任何修改或者等同替换，其均应涵盖在本申请的权利要求保护范围之内。
由技术常识可知，本申请可以通过其它的不脱离其精神实质或必要特征的实施方案来实现。因此，上述公开的实施方案，就各方面而言，都只是举例说明，并不是仅有的。所有在本申请范围内或在等同于本申请的范围内的改变均被本申请包含。

Claims (58)

  1. 一种大容量电池的导电连接片，其特征在于：所述导电连接片为平面导电片或能够折叠的导电片，所述导电连接片分别与极柱、极耳或集流盘连接。
  2. 根据权利要求1所述的大容量电池的导电连接片，其特征在于：所述导电连接片中部沿中心线位置设有等宽等距的矩形连接格栅，所述导电连接片的格栅两侧分别与极柱以及极耳或集流盘连接。
  3. 根据权利要求2所述的大容量电池的导电连接片，其特征在于：所述导电连接片能够沿中心线位置折叠。
  4. 根据权利要求3所述的大容量电池的导电连接片，其特征在于：所述导电连接片的厚度不大于3mm。
  5. 根据权利要求1所述的大容量电池的导电连接片，其特征在于：所述大容量电池中设置极耳集流盘，格栅两侧的导电连接片形状大小与极耳集流盘相同。
  6. 根据权利要求1所述的大容量电池的导电连接片，其特征在于：所述导电连接片包括多个长短不同的金属连接薄片，所述金属连接薄片焊接好后能够折叠。
  7. 根据权利要求6所述的大容量电池的导电连接片，其特征在于：所述金属连接薄片焊接后折叠成M型。
  8. 根据权利要求6或7所述的大容量电池的导电连接片，其特征在于：所述金属连接薄片折叠后金属连接薄片完全包括在卷芯的顶面向上投射面内。
  9. 根据权利要求6所述的大容量电池的导电连接片，其特征在于：所述金属连接薄片厚度不大于2mm，不少于2层。
  10. 一种大容量电池的极柱，其特征在于：包括极柱及权利要求1至5任一所述的导电连接片，所述极柱包括极柱上镶件、绝缘垫片、极柱下镶件和绝缘连接件，所述导电连接片同面的一侧居中焊接极柱，焊好后极柱向外沿格栅垂直中线折弯90度，另一侧焊接极耳或极耳集流盘，再将未焊接面对折后上下两层压紧焊接，或者在上下两层间加入导电胶连接。
  11. 根据权利要求10所述的大容量电池的极柱，其特征在于：所述极柱上镶件为环状结构，环上开有多个均匀分布的安装孔，用于与极柱下镶件进行固定。
  12. 根据权利要求10所述的大容量电池的极柱，其特征在于：所述绝缘垫片为硅橡胶垫圈，卡放于电池上盖极柱孔边缘处，对极柱上镶件与电池上盖顶面、极柱下镶件与极柱孔侧面、极柱下镶件与电池上盖底面进行绝缘，所述绝缘垫片的上、下面带有与极柱上镶件相同的安装孔。
  13. 根据权利要求10所述的大容量电池的极柱，其特征在于：所述极柱下镶件主体为柱状结构，腰中部带有与极柱上镶件相同的环状结构，环上带有与极柱上镶件分布、大小相同的安装孔，底部带有圆台状的焊接底板。
  14. 根据权利要求10所述的大容量电池的极柱，其特征在于：所述绝缘连接件为铆钉，铆钉头带有绝缘柱，保证铆接后，铆钉不与电池上盖接触。
  15. 根据权利要求10所述的大容量电池的极柱，其特征在于：所述导电连接片、极柱上镶件、极柱下镶件材质为铜或铝或带有镀层的铜或铝。
  16. 一种大容量电池的极柱，其特征在于：包括极柱和权利要求6至9任一所述的导电连接片，所述极柱包括极柱上镶件、绝缘垫片、极柱下镶件、下镶件集流盘和绝缘连接件，所述导电连接片的不同长度的金属连接薄片由短到长，一端依次焊接在极耳集流盘上，另一端依次焊接在极柱下镶件集流盘上，每个金属连接薄片的焊接位置从内到外平行并列但不重叠。
  17. 根据权利要求16所述的大容量电池的极柱，其特征在于：所述极柱上镶件为环状结构，环上开有多个均匀分布的安装孔，用于与极柱下镶件进行固定。
  18. 根据权利要求16所述的大容量电池的极柱，其特征在于：所述绝缘垫片为硅橡胶垫圈，卡放于电池上盖极柱孔边缘处，对极柱上镶件与电池上盖顶面、极柱下镶件与极柱孔侧面、极柱下镶件与电池上盖底面进行绝缘，所述绝缘垫片的上、下面带有与极柱上镶件相同的安装孔。
  19. 根据权利要求16所述的大容量电池的极柱，其特征在于：所述极柱下镶件为柱状结构，腰中部带有与极柱上镶件相同的环状结构，环上带有与极柱上镶件分布、大小相同的安装孔，底部带有圆台状的焊接底板。
  20. 根据权利要求16所述的大容量电池的极柱，其特征在于：所述下镶件集流盘形状大小与极耳集流盘相同，居中焊接在极柱下镶件底部圆台上。
  21. 根据权利要求16所述的大容量电池的极柱，其特征在于：所述金属连接薄片焊接好后，折叠成M型，折叠后金属连接薄片完全包括在卷芯的顶面向上投射面内。
  22. 根据权利要求16所述的大容量电池的极柱，其特征在于：所述绝缘连接件为铆钉，铆钉头带有绝缘柱，保证铆接后，铆钉不与电池上盖接触。
  23. 根据权利要求15所述的大容量电池的极柱，其特征在于：所述导电连接片、金属连接薄片、极柱上镶件、极柱下镶件材质为铜或铝或带有镀层的铜或铝。
  24. 一种大容量电池的导电连接结构，其特征在于：包括集流盘和权利要求1所述的平面导电片,所述集流盘包括盘体和设置在所述盘体上的包边，所述导电连接片设置在所述包边内；所述包边与极柱的形状、大小相同。
  25. 根据权利要求24所述的大容量电池的导电连接结构，其特征在于：所述集流盘的底面与极耳焊接，所述包边与极柱柱身焊接。
  26. 根据权利要求25所述的大容量电池的导电连接结构，其特征在于：所述包边为矩形、方形或圆形，且包边的高度不低于5mm，厚度不大于1mm。
  27. 根据权利要求24所述的大容量电池的导电连接结构，其特征在于：所述集流盘的盘体为圆形盘体且厚度不大于1毫米。
  28. 根据权利要求27所述的大容量电池的导电连接结构，其特征在于：所述圆形盘体沿圆周靠近边沿位置均布有至少四个渗液孔。
  29. 根据权利要求24所述的大容量电池的导电连接结构，其特征在于：所述导电连接片设置在极柱与集流盘未焊接的区域。
  30. 根据权利要求24所述的大容量电池的导电连接结构，其特征在于：所述导电连接片为超高导电硅胶片，与极柱端面的形状、大小相同。
  31. 根据权利要求24至30任一项所述的大容量电池的导电连接结构，其特征在于：所述集流盘与极柱连接盘的材质为铝或铜。
  32. 一种大容量电池的导电连接结构，用于实现极耳与极柱的电连接，其特征在于：所述极柱带有极柱集流盘，所述极耳带有极耳集流盘，在所述极柱集流盘与极耳集流盘间未焊接的部分设导电连接片，所述导电连接片为权利要求1所述的平面导电片。
  33. 根据权利要求32所述的大容量电池的导电连接结构，其特征在于：所述导电连接片为薄片状，厚度不大于3mm。
  34. 根据权利要求32所述的大容量电池的导电连接结构，其特征在于：所述导电连接片置于极耳集流盘与极柱集流盘间的未焊接区域，面积等于未焊接区域的面积。
  35. 根据权利要求32所述的大容量电池的导电连接结构，其特征在于：所述导电连接片为金属或非金属导电材料。
  36. 根据权利要求35所述的大容量电池的导电连接结构，其特征在于：所述导电连接片为银片、铜片、镍片、铝片、泡沫银、泡沫铜、泡沫镍、泡沫铝和石墨片、石墨棉的一种或多种。
  37. 根据权利要求36所述的大容量电池的导电连接结构，其特征在于：所述导电连接片为银片、铜片、泡沫银或泡沫铜。
  38. 一种大容量电池的集流盘，其特征在于：所述集流盘沿圆周径向间隔分布多个边条，所述集流盘与导电连接片焊接，所述多个边条能够向上翻折并与极柱连接，所述导电连接片为权利要求1所述的平面导电片。
  39. 根据权利要求38所述的大容量电池的集流盘，其特征在于：所述多个边条为均匀分布的矩形边条。
  40. 根据权利要求38所述的大容量电池的集流盘，其特征在于：所述集流盘为圆形，沿圆周靠近边沿位置均布有多个渗液槽，所述集流盘厚度不大于1mm。
  41. 一种大容量电池的导电连接结构，包括极柱、导电连接片、绝缘垫圈和紧固件和权利要求38至40中任一项所述的集流盘。
  42. 根据权利要求41所述的大容量电池的导电连接结构，其特征在于：所述导电连接片和集流盘上均设有位置、大小相同的渗液槽。
  43. 根据权利要求41所述的大容量电池的导电连接结构，其特征在于：所述极柱柱身部设有轴向定位环，所述定位环装配时位于电池上盖下方的绝缘垫圈之下。
  44. 根据权利要求41所述的大容量电池的导电连接结构，其特征在于：所述导电连接片为圆形，其直径与集流盘直径相同，所述导电连接片上设有渗液槽，大小、位置与集流盘上的渗液槽相同，所述导电连接片厚度不大于1mm。
  45. 根据权利要求43或44所述的大容量电池的导电连接结构，其特征在于：所述导电连接片和集流盘相互焊接的面，在极柱导电盘投影面以下未焊接区域的接触面上均匀涂抹有导电胶。
  46. 根据权利要求41所述的大容量电池的导电连接结构，其特征在于：所述绝缘垫圈为带翻边的空心圆柱形，高度为电池上盖厚度的一半，分别位于电池上盖的上下面。
  47. 根据权利要求41所述的大容量电池的导电连接结构，其特征在于：所述紧固件为两个紧固螺母，分别从电池上盖的上下表面将极柱与电池上盖固定。
  48. 根据权利要求41所述的大容量电池的导电连接结构，其特征在于：所述极柱、集流盘和导电连接片的材质为铝或铜。
  49. 一种大容量电池的导电连接结构，包括极柱下镶件、极柱上镶件、绝缘垫圈、导电连接片、集流盘和绝缘连接件，其特征在于：所述导电连接片为权利要求1所述的平面导电片，所述的极柱下镶件底部设有导电盘，所述导电盘与导电连接片焊接，所述导电连接片与集流盘焊接。
  50. 根据权利要求49所述的大容量电池的导电连接结构，其特征在于：所述极柱下镶件柱身设有定位盘，所述定位盘设有定位孔。
  51. 根据权利要求49所述的大容量电池的导电连接结构，其特征在于：所述极柱上镶件为圆环状，设有与下镶件位置、孔径及数量相同的定位孔。
  52. 根据权利要求48所述的大容量电池的导电连接结构，其特征在于：所述导电连接片为半圆形，导电连接片的上下面分别与导电盘和集流盘焊接。
  53. 根据权利要求49所述的大容量电池的导电连接结构，其特征在于：所述 集流盘为半圆形，集流盘的上下面分别与导电连接片和卷芯极片焊接。
  54. 根据权利要求52或53所述的大容量电池的导电连接结构，其特征在于：所述导电连接片和集流盘相互焊接的面，在极柱导电盘投影面以下未焊接区域的接触面上均匀涂抹有导电胶。
  55. 根据权利要求52或53所述的大容量电池的导电连接结构，其特征在于：所述导电连接片和集流盘相互焊接的面，在极柱导电盘投影面以下未焊接区域的接触面上设有导电连接片。
  56. 根据权利要求49所述的大容量电池的导电连接结构，其特征在于：所述绝缘垫圈上有定位孔，绝缘垫圈设在电池上盖两侧。
  57. 根据权利要求49所述的大容量电池的导电连接结构，其特征在于：所述极柱下镶件、极柱上镶件、导电连接片和集流盘的材质为铝或铜。
  58. 根据权利要求49所述的大容量电池的导电连接结构，其特征在于：所述导电盘直径大于极柱本体的直径。
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