WO2023284825A1 - 集流体组件、电池单体和电池包 - Google Patents

集流体组件、电池单体和电池包 Download PDF

Info

Publication number
WO2023284825A1
WO2023284825A1 PCT/CN2022/105695 CN2022105695W WO2023284825A1 WO 2023284825 A1 WO2023284825 A1 WO 2023284825A1 CN 2022105695 W CN2022105695 W CN 2022105695W WO 2023284825 A1 WO2023284825 A1 WO 2023284825A1
Authority
WO
WIPO (PCT)
Prior art keywords
protrusion
current collector
collector assembly
plate
protrusions
Prior art date
Application number
PCT/CN2022/105695
Other languages
English (en)
French (fr)
Inventor
周龙
吴聪苗
郭敏
蓝金花
Original Assignee
厦门海辰储能科技股份有限公司
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.)
Filing date
Publication date
Priority claimed from CN202121604602.XU external-priority patent/CN217691556U/zh
Priority claimed from CN202110798340.3A external-priority patent/CN113422170A/zh
Priority claimed from CN202110798225.6A external-priority patent/CN113422169A/zh
Priority claimed from CN202110798222.2A external-priority patent/CN113422168A/zh
Priority claimed from CN202121604710.7U external-priority patent/CN217691564U/zh
Priority claimed from CN202121604477.2U external-priority patent/CN217691563U/zh
Priority claimed from CN202110798108.XA external-priority patent/CN113422165A/zh
Priority claimed from CN202121603148.6U external-priority patent/CN217691560U/zh
Application filed by 厦门海辰储能科技股份有限公司 filed Critical 厦门海辰储能科技股份有限公司
Priority to EP22841458.7A priority Critical patent/EP4340116A1/en
Publication of WO2023284825A1 publication Critical patent/WO2023284825A1/zh
Priority to US18/399,740 priority patent/US20240128602A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • 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
    • 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
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • 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
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • 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 invention relates to the technical field of batteries, in particular to a current collector assembly, a battery cell and a battery pack.
  • the single-layer tab is welded with copper foil on both sides of the composite tab by means of ultrasonic roll welding, and the welded copper foil is welded on the soft connection.
  • each layer of tabs needs to be welded, thus increasing the welding cost and the material cost of the copper foil. After welding, the welded part is vulnerable to damage.
  • the present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the present invention proposes a current collector assembly, a battery cell and a battery pack.
  • the current collector assembly is ingeniously designed to reduce the difficulty of welding the tabs and protect the tabs from damage.
  • the invention also proposes a battery cell.
  • the invention also provides a battery pack.
  • a current collector assembly according to the present invention includes:
  • the multi-layer tabs are stacked in the thickness direction of the tabs;
  • the protective plate is arranged on one side of the multi-layer tab in the thickness direction;
  • the connecting plate is arranged on the other side of the multi-layer tab in the thickness direction;
  • the protrusion is arranged between the connecting plate and the protective plate, the protrusion passes through the multiple layers of the tabs and is electrically connected to the multiple layers of the tabs.
  • the current collector assembly of the present invention by providing protrusions, the welding difficulty of the tabs is reduced, the welding process of the workers is simplified, the manufacturing hours are reduced, the labor cost is reduced, and the connection strength between the tabs and the connecting plate is improved.
  • the connection is stable, and the protective plate is set to protect the tab from being damaged during welding.
  • one end of the protrusion is connected to the connection plate, and the other end of the protrusion is located inside the outer surface of the protection plate.
  • the current collector assembly of the present invention by setting the protective plate covering the protrusion, the top of the protrusion is prevented from exceeding the protective plate, thereby avoiding damage to the protrusion, prolonging the service life of the current collector assembly, and improving the contact between the tab and the protrusion.
  • the connection strength between the tabs and the connection are stable, reducing the possibility of the tabs being separated from the protrusions during transportation or use, ensuring the reliability of the battery cell, reducing the failure rate, and ensuring the use of the battery pack. Safety, to avoid the occurrence of accidents.
  • the other end of the protrusion is connected to the protective plate.
  • the other end of the protrusion is fixed to the inner surface of the protective plate.
  • the protrusion is provided on the connection plate, and the protrusion is connected to the protection plate after passing through multiple layers of the tabs.
  • the protrusion is provided on the protective plate, and the protrusion is connected to the connecting plate after passing through multiple layers of the tabs.
  • the height of the protrusion is in the range of 0.1mm to 3mm.
  • the current collector assembly includes a plurality of protrusions arranged in a matrix.
  • the protrusion extends along a straight line and/or a curve.
  • the plurality of protrusions are connected to the multiple layers of tabs by ultrasonic welding, and the density of the plurality of protrusions arranged in the ultrasonic vibration direction is greater than that in other directions.
  • the tab includes: a supporting insulating layer, and a first conductive layer and a second conductive layer respectively covering surfaces on both sides of the supporting insulating layer in the thickness direction.
  • the current collector assembly includes a conductive connection assembly, and the conductive connection assembly includes a protection plate and a connection plate; wherein, at least one of the connection plate and the protection plate is Protrusions are provided, and the protrusions pierce through the multi-layer tabs through high-frequency vibration and are electrically connected to the multiple-layer tabs, and the frequency of the high-frequency vibration is in the range of 15KHz-40KHz.
  • the protrusions pierce the multi-layer tabs through high-frequency vibration, and the high-frequency vibration acts on the contact surface of the solder, so that the surfaces of the two objects rub against each other to generate heat, forming a gap between the molecular layers. Fusion, thereby improving the welding speed between the protrusion and the multi-layer lug, ensuring a stable connection between the lug and the connecting plate, and prolonging the service life of the current collector assembly.
  • the amplitude of the dither is in the range of 5um to 100um.
  • the protrusion extends on the surface of the connecting plate or the protection plate, and the vibration direction of the high-frequency vibration is parallel to the extending direction of the protrusion.
  • the high-frequency vibration is vibration generated by ultrasonic welding.
  • the connecting plate is provided with the protrusion, one end of the protrusion is connected with the connecting plate, and the protrusion provided on the connecting plate pierces through multiple holes through high-frequency vibration.
  • the tabs are layered and electrically connected to multiple layers of the tabs, and the other end of the protrusion is connected to the protective plate.
  • the other end of the protrusion is fixed to the inner surface of the protective plate or embedded in the protective plate by ultrasonic welding.
  • the protection plate is provided with the protrusion, and the protrusion provided on the protection plate is connected to the connection plate after piercing through multiple layers of the tabs through high-frequency vibration.
  • At least one of the connecting plate and the protective plate is provided with a plurality of protrusions, and the plurality of protrusions are arranged in a matrix.
  • the density of the plurality of protrusions arranged in the vibration direction of the high-frequency vibration is greater than that in other directions except the vibration direction of the high-frequency vibration.
  • the plurality of protrusions extend along the vibration direction of the high-frequency vibration and are arranged at intervals perpendicular to the vibration direction of the high-frequency vibration.
  • the current collector assembly includes a conductive connection assembly, and the conductive connection assembly includes a protection plate and a connection plate; wherein, at least one of the connection plate and the protection plate is A protrusion is provided, and the protrusion includes a connection section and a puncture section connected in the height direction, one end of the connection section is connected with the connection plate or the protection plate, and the puncture section is connected to the connection section.
  • the piercing section is configured to be suitable for piercing the multi-layer tab, and the protrusion is electrically connected to the multi-layer tab.
  • the puncture end is easy to pierce through the multi-layer tab, and the welding energy is easy to penetrate the connecting plate and the multi-layer tab, thereby reducing the
  • the difficulty of welding simplifies the welding process of workers, reduces the man-hours of production, reduces labor costs, and prolongs the service life of current collector components.
  • the cross-sectional areas of the connecting sections are the same, and the connecting sections are electrically connected to multiple layers of the tabs.
  • the piercing section is formed in the shape of a cone or a frustum of cone.
  • the protrusion extends along a straight line and/or a curve on the surface of the connecting plate or the protective plate, and the section of the piercing section perpendicular to the extending direction of the protrusion is formed in a triangle or trapezoid.
  • the cross-sectional area of the piercing section decreases gradually, and the apex angle of the piercing section is not greater than 120°.
  • the height of the piercing section is not greater than 2 mm.
  • the connecting section transitions smoothly with the puncturing section.
  • At least one of the connecting plate and the protective plate is provided with a plurality of protrusions, and the plurality of protrusions are arranged in a matrix.
  • the protrusion includes a first protrusion and a second protrusion; the first protrusion is provided on the protection plate, and the first protrusion passes through the multi-layer
  • the tabs are electrically connected to the tabs of multiple layers; second protrusions are provided on the connecting plate, and the second protrusions pass through the tabs of multiple layers and are electrically connected to the tabs of multiple layers.
  • connection strength between the tab and the protrusion is further improved by setting the protrusion on the protection plate and the connection plate at the same time, making the connection stable, ensuring the piercing effect of the protrusion, and increasing the The contact area between the protrusion and the tab stabilizes the reliability of the conductive connection, reduces the failure rate, ensures the yield rate of the battery cell, and also ensures the safety of the battery pack, avoiding accidents.
  • the protective plate is provided with a plurality of the first protrusions, and the plurality of first protrusions are arranged at intervals in the plane where the protective plate is located, and the connecting plate is provided with a plurality of the first protrusions.
  • the second protrusions, a plurality of second protrusions are arranged at intervals in the plane where the connecting plate is located.
  • At least one group of adjacent two first protrusions is provided with a second protrusion, or at least one group of adjacent two first protrusions is provided with a second protrusion. There is a first protrusion between the two second protrusions.
  • the plurality of first protrusions and the plurality of second protrusions are alternately arranged in a plane perpendicular to the thickness direction of the tab.
  • the first protrusion is connected to the connecting plate after passing through multiple layers of the tabs
  • the second protrusion is connected to the protective plate after passing through the multiple layers of the tabs.
  • the surface of the connecting plate facing away from the tab in the thickness direction is the first surface
  • the surface of the protective plate facing away from the tab in the thickness direction is the second surface
  • the first Both ends of the protrusion in the thickness direction of the tab and both ends of the second protrusion in the thickness direction of the tab are located inside the first surface and inside the second surface.
  • any one of the first protrusion and the second protrusion includes: a connection section and a piercing section connected in the height direction, one end of the connection section is connected with the connection plate or the protection plate, The piercing section is connected to the other end of the connecting section, and the piercing section is configured to be suitable for piercing the multi-layer tab.
  • the cross-sectional areas of the connecting sections are the same, and the connecting sections are electrically connected to multiple layers of the tabs.
  • the current collector assembly includes a pole piece, and the pole piece includes a current collector and a plurality of the pole lugs, and the plurality of the pole lugs are stacked; The first conductive layer and the second conductive layer on both sides of the supporting insulating layer in the thickness direction.
  • the battery cell according to the fifth aspect of the present invention includes the current collector assembly of any one of the first to fourth aspects of the present invention.
  • the battery cell of the present invention by applying the current collector assembly of the above-mentioned first aspect to the battery cell, the difficulty of assembling the battery cell is reduced, the manufacturing hours of the battery cell are reduced, the labor cost is reduced, and the the reliability of the battery cell.
  • the battery pack according to the sixth aspect of the present invention includes the battery cell according to the fifth aspect of the present invention.
  • the safety performance of the battery pack is improved, the reliability of the battery pack is ensured, and dangers are avoided by arranging the battery cells of the fifth aspect above.
  • Fig. 1 is a schematic diagram of a current collector assembly according to an embodiment of the first aspect of the present invention
  • FIG. 2 is a schematic diagram of a side view of the current collector assembly shown in FIG. 1;
  • Fig. 3 is a schematic diagram of the connecting plate shown in Fig. 1;
  • Figure 4 is a schematic illustration of a side view of the connecting plate shown in Figure 3;
  • Fig. 5 is a partially enlarged view of the protrusion shown in Fig. 4;
  • Fig. 6 is the schematic diagram of the connecting plate of another embodiment shown in Fig. 1;
  • Fig. 7 is a schematic diagram of another embodiment of the connecting plate shown in Fig. 1;
  • Fig. 8 is a schematic diagram of the connecting plate shown in Fig. 1, wherein the protrusion is formed as a cone;
  • Figure 9 is a schematic illustration of a side view of the connecting plate shown in Figure 8.
  • Fig. 10 is a schematic diagram of another embodiment of the connecting plate shown in Fig. 1;
  • Figure 11 is a schematic illustration of a side view of the connecting plate shown in Figure 10;
  • Fig. 12 is a schematic diagram of the connection plate shown in Fig. 1, wherein the protrusion includes a connection section and a puncture section;
  • Figure 13 is a schematic illustration of a side view of the connecting plate shown in Figure 12;
  • Figure 14 is a schematic view of the connecting plate shown in Figure 1, wherein the protrusions are formed as pyramids;
  • Figure 15 is a schematic illustration of a side view of the connection plate shown in Figure 14;
  • Fig. 16 is a schematic diagram of a connecting plate of a specific embodiment shown in Fig. 1;
  • Figure 17 is a schematic illustration of a side view of the connection plate shown in Figure 16;
  • FIG. 18 is a schematic illustration of a side view of the current collector assembly shown in FIG. 16;
  • Fig. 19 is a schematic diagram of a battery cell according to an embodiment of the second aspect of the present invention.
  • Figure 20 is a schematic diagram of the current collector assembly shown in Figure 19;
  • Figure 21 is a schematic diagram of the connecting plate shown in Figure 19;
  • Figure 22 is a schematic diagram of a top view of the connecting plate shown in Figure 20;
  • Figure 23 is a schematic diagram of a battery cell in another embodiment
  • Figure 24 is a schematic diagram of the current collector assembly shown in Figure 23;
  • Figure 25 is a schematic diagram of the connecting plate shown in Figure 23;
  • Figure 26 is a schematic illustration of a top view of the connecting plate shown in Figure 25;
  • Fig. 27 is a schematic diagram of a battery cell in yet another embodiment
  • Figure 28 is a schematic diagram of the current collector assembly shown in Figure 27;
  • Figure 29 is a schematic diagram of the connecting plate shown in Figure 27;
  • Figure 30 is a schematic illustration of a top view of the connecting plate shown in Figure 29;
  • Fig. 31 is a schematic diagram of a current collector.
  • FIG. 32 is a schematic illustration of a side view of the current collector assembly shown in FIG. 1;
  • Fig. 33 is a schematic diagram of the current collector assembly, wherein the first protrusion is formed on the protection plate;
  • FIG. 34 is a schematic illustration of a side view of the current collector assembly shown in FIG. 33;
  • FIG. 35 is a schematic diagram of the protective plate shown in FIG. 34 .
  • connection plate 101
  • a current collector assembly 200 according to an embodiment of the first aspect of the present invention will be described below with reference to FIGS. 1-31 .
  • the current collector assembly 200 includes: a multi-layer tab 20211 , a protective plate 201 , a connecting plate 101 and a protrusion 1012 .
  • the current collector assembly 200 includes a multi-layer tab 20211 , a protective plate 201 , a connecting plate 101 and a protrusion 1012 .
  • the multi-layer tabs 20211 are stacked in the thickness direction of the tabs 20211, the protective plate 201 is set on one side of the multi-layer tabs 20211 in the thickness direction, and the connecting plate 101 is set on the other side of the multi-layer tabs 20211 in the thickness direction
  • One end of the protrusion 1012 is connected to the connection plate 101 , the protrusion 1012 passes through the multi-layer tab 20211 and is electrically connected to the multi-layer tab 20211 , and the other end of the protrusion 1012 is located inside the outer surface of the protection plate 201 .
  • the multi-layer tab 20211 is stacked, and the protective plate 201 is arranged on one side of the multi-layer tab 20211 (for example, as shown in FIG. 2 ).
  • the connection plate 101 is arranged on the other side of the multi-layer tab 20211 (such as the lower side of the multi-layer tab 20211 shown in FIG.
  • the upper end of the riser 1012 is located in a surface of the protective plate 201 facing the connection plate 101.
  • the multi-layer tabs 20211 are stacked up and down, the protective plate 201 is located on the upper side of the multi-layer tabs 20211, the connecting plate 101 is located on the lower side of the multi-layer tabs 20211, the connecting plate 101 and the The lower ends of the protrusions 1012 are connected, the upper ends of the protrusions 1012 are suitable for piercing the multi-layer tabs 20211 , the protrusions 1012 and the tabs 20211 are electrically connected, and the upper ends of the protrusions 1012 are located in the lower surface of the protection plate 201 . It can be understood that the protrusion 1012 is covered by the protective plate 201 .
  • the current collector assembly 200 of the embodiment of the present invention by setting the protective plate 201 covering the protrusion 1012, the top of the protrusion 1012 is prevented from exceeding the protective plate 201, thereby preventing the protrusion 1012 from being damaged and prolonging the lifetime of the current collector assembly 200.
  • the service life improves the connection strength between the tab 20211 and the protrusion 1012, and the connection is stable, which reduces the possibility of the tab 20211 being separated from the protrusion 1012 during transportation or use, and ensures the reliability of the battery cell 1000 It reduces the failure rate, ensures the safety of the battery pack, and avoids accidents.
  • the other end of the protrusion 1012 is connected to the protective plate 201 .
  • the upper end of the protrusion 1012 is connected to the protection plate 201 , and the protrusion 1012 and the protection plate 201 can be connected by means of welding, bonding, clamping, plugging and the like.
  • the other end of the protrusion 1012 is fixed on the inner surface of the protection plate 201 .
  • the upper end of the protrusion 1012 is fixed on the lower surface of the protection plate 201 .
  • the good product rate of 1000 battery cells reduces the danger of the battery pack and makes it safer to use.
  • the protrusion 1012 is provided on the connecting plate 101, and the protrusion 1012 is connected to the protective plate 201 after passing through the multi-layer lug 20211, and the protrusion 1012 can be integrally formed with the connecting plate 101, thus, The number of components of the current collector assembly 200 is reduced, the overall connection strength of the current collector assembly 200 is improved, the connection stability between the protrusion 1012 and the tab 20211 is improved, the defective rate of the current collector assembly 200 is reduced, and the The service life of the current collector assembly 200.
  • connection plate 101 and the protrusion 1012 are arranged separately, and the protrusion 1012 is connected to the connection plate 101 by welding, bonding, inserting or clamping, so that the connection plate 101 and the protrusion 1012 is two independent parts, which reduces the production difficulty of the current collector assembly 200, reduces the production cost of the current collector assembly 200, and improves the error tolerance rate during the welding process of the protrusion 1012 and the tab 20211.
  • the protrusion 1012 is connected to the connection plate 101 by welding, the connection method is simple, and the connection between the protrusion 1012 and the connection plate 101 is firm and not easily damaged.
  • the protrusions 1012 can be connected to the connecting plate 101 by means of electromagnetic pulse welding; the plurality of protrusions 1012 can also be connected to the connecting plate 101 by means of friction welding; the plurality of protrusions 1012 can also be connected to the connecting plate 101 by means of ultrasonic welding
  • the connecting board 101 is connected.
  • the protrusion 1012 is provided on the protective plate 201, and the protrusion 1012 is connected to the connecting plate 101 after passing through the multi-layer tab 20211, and the protrusion 1012 can be integrally formed with the protective plate 201, so that , reducing the number of components of the current collector assembly 200, improving the overall connection strength of the current collector assembly 200, improving the connection stability between the protrusion 1012 and the tab 20211, reducing the defective rate of the current collector assembly 200, and extending the The service life of the current collector assembly 200 is extended.
  • the protective plate 201 and the protrusion 1012 are arranged separately, and the protrusion 1012 is connected to the protective plate 201 by welding, bonding, plugging or clamping, so that the protective plate 201 and the protrusion 1012 is two independent parts, which reduces the production difficulty of the current collector assembly 200, reduces the production cost of the current collector assembly 200, and improves the error tolerance rate during the welding process of the protrusion 1012 and the tab 20211.
  • the protrusion 1012 is connected to the protective plate 201 by welding, the connection method is simple, and the protrusion 1012 is firmly connected to the protective plate 201 and is not easily damaged.
  • the protrusion 1012 can be connected to the protective plate 201 by means of electromagnetic pulse welding; the plurality of protrusions 1012 can also be connected to the protective plate 201 by friction welding; the plurality of protrusions 1012 can also be connected to the protective plate 201 by ultrasonic welding.
  • the protection board 201 is connected.
  • the height of the protrusion 1012 ranges from 0.1 mm to 3 mm in the thickness direction of the tab 20211 . That is to say, the height of the protrusion 1012 protruding from the connection plate 101 is in the range of 0.1mm to 3mm, so that not only avoids the waste of materials, but also ensures the connection strength between the tab 20211 and the connection plate 101, and the battery cell
  • the overall structure of the 1000 is easy to assemble into a battery pack, which saves installation space, makes the structure compact, reduces the volume of the battery pack, and reduces transportation costs.
  • the height of the protrusion 1012 can be: 0.1mm, 0.15mm, 0.2mm, 0.4mm, 0.55mm, 0.6mm, 0.85mm, 1.0mm, 1.1mm, 1.2mm, 1.35mm, 1.4mm, 1.5mm, 1.6 mm, 1.7mm, 1.8mm, 2.0mm, 2.2mm, 2.45mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, etc.
  • the width of the protrusion 1012 is in the range of 0.1mm-3mm, thereby not only avoiding material waste, but also ensuring the stability of the connection between the tab 20211 and the connecting plate 101 .
  • the width of the protrusion 1012 can be: 0.1mm, 0.15mm, 0.2mm, 0.3mm, 0.4mm, 0.55mm, 0.6mm, 0.85mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.35mm, 1.4 mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.45mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, etc.
  • the current collector assembly 200 includes a plurality of protrusions 1012 arranged in a matrix.
  • the plurality of protrusions 1012 arranged in an array improves the connection strength between the tabs 20211 and the protrusions 1012, prevents the tabs 20211 from being separated from the protrusions 1012 during transportation or use, and improves the yield rate of the battery cell 1000.
  • the contact area between the protrusion 1012 and the tabs 20211 of each layer is increased, the flow-through area is increased, the heat dissipation is balanced, the battery pack is less likely to fail, the user's risk factor is reduced, and the user's experience is improved.
  • the protrusion 1012 extends along a straight line and/or a curve on the surface of the connecting plate 101 . That is to say, the protrusion 1012 on the surface of the connecting plate 101 may extend along a straight line, the protrusion 1012 may also extend along a curve on the surface of the connecting plate 101, and the protrusion 1012 may also extend on the surface of the connecting plate 101 Extend in a straight line and then in a curve, or in a curve and then in a straight line.
  • the welding requirements of different composite current collectors 202 are met, the connection strength between the tabs 20211 and the connecting plate 101 is improved, the use range of the connecting plate 101 is expanded, and the production cost of the connecting plate 101 is reduced.
  • the plurality of protrusions 1012 are connected to the multi-layer tabs 20211 by ultrasonic welding.
  • the protrusion 1012 extends along a curve on the upper surface of the connecting plate 101, the protrusion 1012 is formed in a ring shape, and four grooves are formed on the upper part of the protrusion 1012, and the four grooves are formed on the upper part of the protrusion 1012. Evenly spaced, and the four grooves are recessed from the upper end of the protrusion 1012 in the vertical direction, which increases the contact area between the protrusion 1012 and each layer of tabs 20211, increases the flow area, and improves the connection strength.
  • the density of the plurality of protrusions 1012 arranged in the ultrasonic vibration direction is greater than that in other directions. That is to say, the plurality of protrusions 1012 protrude toward the direction away from the connecting plate 101, the plurality of protrusions 1012 are arranged in the most densely in the ultrasonic vibration direction, and the plurality of protrusions 1012 are arranged in the direction other than the ultrasonic vibration direction.
  • the denseness of the plurality of protrusions 1012 is smaller than the denseness of the plurality of protrusions 1012 in the ultrasonic vibration direction.
  • the plurality of protrusions 1012 are arranged in an array on the surface of the connecting plate 101 , and the arrangement of the plurality of protrusions 1012 is the most dense along the ultrasonic vibration direction. It should be noted here that when the density of the plurality of protrusions 1012 arranged in the direction of ultrasonic vibration is high enough, the protrusions 1012 are formed in the shape of a strip extending in the direction of ultrasonic vibration.
  • the distance between two adjacent protrusions 1012 in the ultrasonic vibration direction is L1
  • the distance between two adjacent protrusions 1012 perpendicular to the ultrasonic vibration direction is L2
  • L1 and L2 satisfy: 0.5mm ⁇ L1 ⁇ 10mm, 0.5mm ⁇ L2 ⁇ 10mm, and L1 ⁇ L2. That is to say, the distance between two adjacent protrusions 1012 in the direction of ultrasonic vibration is not greater than the distance between two adjacent protrusions 1012 perpendicular to the direction of ultrasonic vibration, that is, a plurality of protrusions 1012 in the vertical
  • the denseness of arrangement in the direction of ultrasonic vibration is smaller than that of arrangement in the direction of ultrasonic vibration. In this way, the welding speed is further improved, the production efficiency is improved, the production cost is reduced, the arrangement of the protrusions 1012 is optimized, the weak welding points between the tabs 20211 and the connecting plate 101 are avoided, and the product quality is improved.
  • the distance L1 between two adjacent protrusions 1012 in the ultrasonic vibration direction can be: 0.5mm, 0.7mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5 mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc.
  • the distance L2 between two adjacent protrusions 1012 perpendicular to the ultrasonic vibration direction can be: 0.5mm, 0.7mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm , 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm and so on.
  • a plurality of protrusions 1012 extend along the ultrasonic vibration direction on the surface of the connecting plate 101 and are arranged at intervals in a direction perpendicular to the ultrasonic vibration.
  • a plurality of protrusions 1012 extend along the vibration direction of the ultrasonic wave on the upper surface of the connecting plate 101, and are arranged at intervals in a direction perpendicular to the direction of the ultrasonic vibration.
  • the protrusions 1012 are formed in a strip shape, increasing the The contact area between the tab 20211 and the protrusion 1012 avoids weak welding between the tab 20211 and the protrusion 1012 and improves the connection strength between the tab 20211 and the connecting plate 101 .
  • the distance L2 between two adjacent protrusions 1012 is not less than the width d of the protrusions 1012 . That is to say, the distance L2 between two adjacent protrusions 1012 in the direction perpendicular to the ultrasonic vibration direction is greater than or equal to the width d of the protrusions 1012, and L2 may be greater than d, or L2 may be equal to d.
  • the length of the protrusion 1012 in the ultrasonic vibration direction is L
  • the width of the protrusion 1012 perpendicular to the ultrasonic vibration direction is d
  • L and d satisfy: L*2+d*2 ⁇ X
  • X is the width of tab 20211.
  • the circumference of the protrusion 1012 should not be smaller than the width of the tab 20211 .
  • the width X of the tab 20211 is the side length of the tab 20211 perpendicular to the direction of ultrasonic vibration. Referring to FIG. 16 , the length of the tab 20211 in the left and right direction is the width of the tab 20211 .
  • the connecting plate 101 and the protrusion 1012 are made of the same material. Due to different materials, the parameters such as temperature resistance and resistance of conductors are also different, and there are great potential safety hazards. However, using the same material ensures the reliability of the battery cell 1000, reduces the failure rate, and also ensures the safety of the battery pack. Use safety to avoid accidents.
  • connection board 101 is made of T2 pure copper or copper alloy or the like.
  • the conductive connection assembly 100 includes: a connection plate 101 and a protrusion 1012, the connection plate 101 is used to connect with the multi-layer tab 20211 of the current collector 202 by ultrasonic welding, the connection plate 101 includes: the connection plate 101 and The protrusion 1012 provided on the connecting plate 101, the protrusion 1012 protrudes from one side surface of the connecting plate 101 in the thickness direction, the conductive connecting assembly 100 includes a plurality of protrusions 1012, and the plurality of protrusions 1012 pass through the multi-layer electrode Ear 20211.
  • the tab 20211 includes: a supporting insulating layer 202113 and a first conductive layer 202111 and a second conductive layer 202112 respectively covering the surfaces on both sides of the supporting insulating layer 202113 in the thickness direction.
  • the supporting insulating layer 202113 is located between the first conductive layer 202111 and the second conductive layer 202112, and the first conductive layer 202111 and the second conductive layer 202112 respectively cover the upper surface and the lower surface of the supporting insulating layer 202113 .
  • the supporting insulating layer 202113 is a composite polymer insulating layer.
  • the protrusion 1012 includes two parts: a connection section 10121 and a puncture section 10122.
  • the lower part of the protrusion 1012 is the connection section 10121, and the upper part of the protrusion 1012 is the puncture section 10122.
  • 10121 is connected to the connecting plate 101, and the piercing section 10122 is connected to the upper end of the connecting section 10121.
  • the piercing section 10122 of the protrusion 1012 is used to pierce the multi-layer tab 20211
  • the connecting section 10121 of the protrusion 1012 is used to connect the multi-layer tab 20211, so that welding energy can easily penetrate the connecting plate 101 and the tab 20211 , reducing the welding difficulty between the tab 20211 and the connection plate 101, reducing the man-hours of manufacture, improving the connection strength between the tab 20211 and the connection plate 101, and the connection is stable, which ensures the piercing effect of the protrusion 1012 and improves connection strength.
  • a current collector assembly 200 according to a specific embodiment of the present invention will be described below with reference to FIGS. 1-31 .
  • the protrusion 1012 is formed in a long strip shape, and the current collector assembly 200 has a multi-layer tab 20211, a protective plate 201, a connecting plate 101 and a plurality of protrusions 1012, and each protrusion 1012 protrudes upward from the connecting plate 101 , and a plurality of protrusions 1012 extend along the direction of ultrasonic vibration on the upper surface of the connecting plate 101, the thickness of the connecting plate 101 is 0.8 mm, the length L of the protrusion 1012 is 13 mm, and the width d of the protrusion 1012 is 0.6 mm , the height of the protrusions 1012 is 0.6 mm, the distance L2 between two adjacent protrusions 1012 is 2.4 mm, the protrusions 1012 extend in a straight line on the upper surface of the connection plate 101, and the connection plate 101 is integrally formed with a plurality of protrusions 1012,
  • the tab 20211 has three layers, which are from top to bottom:
  • a current collector assembly 200 according to an embodiment of the second aspect of the present invention will be described below with reference to FIGS. 1-31 .
  • the current collector assembly 200 includes: a current collector 202 and a conductive connection assembly 100 .
  • the current collector assembly 200 includes: a current collector 202 and a conductive connection assembly 100, the current collector 202 includes a multi-layer tab 20211, the multi-layer tab 20211 is stacked in the thickness direction of the tab 20211, and the conductive connection assembly 100 includes a protective plate 201 and connecting plate 101, the protective plate 201 is set on one side of the multilayer tab 20211 in the thickness direction, and the connecting plate 101 is set on the other side of the multilayer tab 20211 in the thickness direction, wherein the connecting plate 101 and the protective plate At least one of the 201 is provided with a protrusion 1012, and the protrusion 1012 pierces the multi-layer tab 20211 and electrically connects with the multi-layer tab 20211 through high-frequency vibration, and the frequency of the high-frequency vibration is in the range of 15KHz-40KHz.
  • the connecting plate 101 is provided with a protrusion 1012 .
  • the protection plate 201 is provided with a protrusion 1012 .
  • both the connection plate 101 and the protection plate 201 are provided with protrusions 1012 .
  • the multi-layer tabs 20211 are stacked in the thickness direction of the tabs 20211, the protective plate 201 is arranged on one side of the multi-layer tabs 20211 in the thickness direction, and the connecting plate 101 is arranged on the multi-layer tabs 20211 in the thickness direction.
  • the protrusion 1012 On the other side, one end of the protrusion 1012 is connected to the connection plate 101, the protrusion 1012 passes through the multi-layer tab 20211 and is electrically connected to the multi-layer tab 20211, and the other end of the protrusion 1012 is located on the outer surface of the protection plate 201
  • the protrusion 1012 can be formed on the connecting plate 101 , and the protrusion 1012 can also be formed on the protection plate 201 , and the protrusion 1012 pierces the multi-layer tab 20211 through high-frequency vibration in the vibration frequency range of 15KHz-40KHz.
  • the vibration frequency of high frequency vibration can be: 15KHz, 20KHz, 25KHz, 30KHz, 35KHz, 40KHz and so on.
  • the protrusion 1012 pierces the multi-layer tab 20211 through high-frequency vibration, and the high-frequency vibration acts on the contact surface of the solder, so that the surfaces of the two objects rub against each other to generate heat, forming
  • the fusion between the molecular layers further improves the welding speed between the protrusion 1012 and the multi-layer tab 20211 , ensures a stable connection between the tab 20211 and the connecting plate 101 , and prolongs the service life of the current collector assembly 200 .
  • the amplitude of the high-frequency vibration when the amplitude of the high-frequency vibration is in the range of 5 um to 100 um, the welding effect can be further improved, the welding speed can be further increased, and the difficulty of welding can be further reduced.
  • the amplitude of high frequency vibration can be: 5um, 10um, 15um, 20um, 25um, 30um, 35um, 40um, 45um, 50um, 55um, 60um, 65um, 70um, 75um, 80um, 85um, 90um, 95um, 100um, etc. Wait.
  • the protrusion 1012 extends on the surface of the connecting plate 101 or the protection plate 201 , and the vibration direction of the high-frequency vibration is parallel to the extending direction of the protrusion 1012 . That is to say, the protrusion 1012 can extend on the surface of the connection plate 101, and the protrusion 1012 can also extend on the surface of the protective plate 201.
  • the extending direction of the protrusion 1012 is parallel to the direction of the high-frequency vibration, and the extending direction of the protrusion 1012 is parallel to the direction of the high-frequency vibration. The direction is consistent, which helps to speed up the welding speed of the protrusion 1012 and the tab 20211, reduces production time, and improves production efficiency.
  • the protrusion 1012 extends along a curve on the upper surface of the connecting plate 101, the protrusion 1012 is formed in a ring shape, and four grooves are formed on the upper part of the protrusion 1012, and the four grooves are formed on the upper part of the protrusion 1012. Evenly spaced, and the four grooves are recessed from the upper end of the protrusion 1012 in the vertical direction, which increases the contact area between the protrusion 1012 and each layer of tabs 20211, increases the flow area, and improves the connection strength.
  • the high-frequency vibration is vibration generated by ultrasonic welding. Due to ultrasonic welding, the welding speed is fast, the welding strength is high, and the sealing is good. It replaces the traditional welding/bonding process. Good electrical conductivity, extremely low or almost zero resistivity, short welding time, no need for any flux, gas, solder, no sparks during welding, environmentally friendly and safe.
  • the ultrasonic welding pressure is not less than 20N, and the welding time is not less than 30ms.
  • connection plate 101 is provided with a protrusion 1012, and one end of the protrusion 1012 is connected to the connection plate 101, and the protrusion 1012 provided on the connection plate 101 pierces through the multi-layer tab through high-frequency vibration 20211 and is electrically connected to the multi-layer tab 20211 , and the other end of the protrusion 1012 is connected to the protective plate 201 .
  • the lower end of the protrusion 1012 is connected to the connecting plate 101 , the protrusion 1012 pierces the multi-layer tab 20211 under the high-frequency vibration of ultrasonic welding, and the protrusion 1012 is electrically connected to the multi-layer tab 20211 .
  • the protrusion 1012 is more likely to pierce the multi-layer tab 20211, further speeding up the welding speed.
  • the other end of the protrusion 1012 is fixed to the inner surface of the protection plate 201 or embedded in the protection plate 201 by ultrasonic welding.
  • the upper end of the protrusion 1012 is fixedly connected to the protective plate 201 by ultrasonic welding, and the upper end of the protrusion 1012 is connected to the lower surface of the protective plate 201 .
  • the connection strength between the lug 20211 and the protrusion 1012 is further improved, and the detachment of the lug 20211 and the protrusion 1012 is avoided, so that the structure of the current collector assembly 200 is more stable, ensuring the production yield of the current collector assembly 200, and improving the efficiency of the current collector assembly 200.
  • the good product rate of 1000 battery cells reduces the risk of battery packs.
  • the upper end of the protrusion 1012 can also be embedded in the protective plate 201 and connected with the protective plate 201 .
  • the protective plate 201 is provided with a protrusion 1012 , and the protrusion 1012 provided on the protective plate 201 pierces through the multi-layer tab 20211 through high-frequency vibration and is connected to the connecting plate 101 .
  • the upper end of the protrusion 1012 is connected to the protective plate 201, the protrusion 1012 pierces the multi-layer tab 20211 under the high-frequency vibration of ultrasonic welding, and the lower end of the protrusion 1012 is connected to the connecting plate 101, and the protrusion 1012 is connected to the connecting plate 101.
  • 1012 is electrically connected to the multi-layer tab 20211. Therefore, when the protective plate 201 is under the action of its own gravity during welding, the protrusion 1012 is more likely to pierce the multi-layer tabs 20211 , which speeds up the welding speed.
  • the current collector assembly 200 includes a plurality of protrusions 1012 arranged in a matrix. Specifically, a plurality of protrusions 1012 are arranged in a matrix on one side of the connection plate 101, and the plurality of protrusions 1012 arranged in an array improves the connection strength between the tab 20211 and the connection plate 101, avoiding the During use, the tabs 20211 and the connecting plate 101 are separated from each other, which improves the yield rate of the battery cell 1000, increases the contact area between the protrusion 1012 and each layer of the tabs 20211, increases the flow area, and achieves a balanced heat dissipation.
  • the battery pack is not easy to break down, which reduces the risk factor of the user and improves the experience of the user.
  • the density of the plurality of protrusions 1012 arranged in the vibration direction of the high-frequency vibration is greater than that in other directions except the vibration direction of the high-frequency vibration. That is to say, the denseness of the multiple protrusions 1012 arranged in the ultrasonic vibration direction is greater than that of other directions.
  • the density of the arrangement is the largest, and the density of the plurality of protrusions 1012 in directions other than the direction of ultrasonic vibration is smaller than that of the plurality of protrusions 1012 in the direction of ultrasonic vibration.
  • the plurality of protrusions 1012 extend along the vibration direction of the high-frequency vibration and are arranged at intervals perpendicular to the vibration direction of the high-frequency vibration.
  • a plurality of protrusions 1012 extend along the vibration direction of the ultrasonic wave on the upper surface of the connecting plate 101, and are arranged at intervals in a direction perpendicular to the direction of the ultrasonic vibration.
  • the protrusions 1012 are formed in a strip shape, increasing the The contact area between the tab 20211 and the protrusion 1012 avoids weak welding between the tab 20211 and the protrusion 1012 and improves the connection strength between the tab 20211 and the connecting plate 101 .
  • the current collector assembly 200 includes a pole piece 2021.
  • the pole piece 2021 includes a plurality of tabs 20211, and the plurality of tabs 20211 are stacked.
  • the first conductive layer 202111 and the second conductive layer 202112 on both sides in the thickness direction.
  • the supporting insulating layer 202113 is located between the first conductive layer 202111 and the second conductive layer 202112, and the first conductive layer 202111 and the second conductive layer 202112 respectively cover the upper surface and the lower surface of the supporting insulating layer 202113 .
  • the supporting insulating layer 202113 can be a polymer layer.
  • the ultrasonic wave cannot be transmitted to the multi-layer tab 20211 at the bottom. Insufficient friction will lead to false welding and unreliable welding.
  • the friction force during welding can be increased, and the phenomenon of unreliable welding caused by false welding can be improved.
  • the battery cell 1000 may include at least two pole pieces 2021 , one is a positive pole piece and the other is a negative pole piece.
  • the multiple tabs 20211 that are stacked can be formed by winding one pole piece plate and stacking multiple pole tabs 20211 on the pole piece plate, or by stacking multiple pole piece plates and making each The tabs 20211 on the pole sheet are aligned, and finally a plurality of tabs 20211 stacked are formed.
  • the plurality of tabs 20211 can be two tabs 20211, or more than two tabs 20211.
  • a current collector assembly 200 according to a specific embodiment of the present invention will be described below with reference to FIGS. 1-31 .
  • the protrusion 1012 is formed in a strip shape
  • the current collector assembly 200 has a current collector 202 and a conductive connection assembly 100
  • the upper surface of the connection plate 101 is provided with a plurality of protrusions 1012
  • the plurality of protrusions 1012 are formed on the connection plate.
  • the upper surface of 101 extends along the ultrasonic vibration direction
  • the thickness of connecting plate 101 is 0.8 mm
  • the height of protrusion 1012 is 0.6 mm
  • the length L of protrusion 1012 is 13 mm
  • the width d of protrusion 1012 is 0.6 mm.
  • the distance L2 between each protrusion 1012 is 2.4 mm.
  • the protrusions 1012 extend in a straight line on the upper surface of the connection plate 101.
  • the connection plate 101 is integrally formed with a plurality of protrusions 1012.
  • the tab 20211 has three layers, which are respectively from top to bottom. : the first conductive layer 202111, the second conductive layer 202112 and the supporting insulating layer 202113, the protective plate 201 is arranged on the top of the multi-layer tab 20211, the upper end of the protrusion 1012 is connected with the protective plate 201, and the vibration frequency of the ultrasonic wave is 15KHz-40KHz Within the range, the amplitude is in the range of 5um to 100um, the ultrasonic welding pressure is not less than 20N, and the welding time is not less than 30ms.
  • a current collector assembly 200 according to an embodiment of the third aspect of the present invention will be described below with reference to FIGS. 1-31 .
  • the current collector assembly 200 includes: a current collector 202 and a conductive connection assembly 100 .
  • the current collector assembly 200 includes: a current collector 202 and a conductive connection assembly 100, the current collector 202 includes a multi-layer tab 20211, the multi-layer tab 20211 is stacked in the thickness direction of the tab 20211, and the conductive connection assembly 100 includes a protective plate 201 and connecting plate 101, the protective plate 201 is set on one side of the multilayer tab 20211 in the thickness direction, and the connecting plate 101 is set on the other side of the multilayer tab 20211 in the thickness direction, wherein the connecting plate 101 and the protective plate At least one of the 201 is provided with a protrusion 1012, the protrusion 1012 includes a connecting section 10121 and a piercing section 10122 connected in the height direction, one end of the connecting section 10121 is connected with the connecting plate 101 or the protective plate 201, and the piercing section 10122 is connected to the connection On the other end of the segment 10121 , the piercing segment 10122 is configured to pierce the multi-layer tab 20211 , and the protrusion
  • the connecting plate 101 is provided with a protrusion 1012 .
  • the protection plate 201 is provided with a protrusion 1012 .
  • both the connection plate 101 and the protection plate 201 are provided with protrusions 1012 .
  • the multi-layer tabs 20211 are stacked in the thickness direction of the tabs 20211, the protective plate 201 is arranged on one side of the multi-layer tabs 20211 in the thickness direction, and the connecting plate 101 is arranged on the multi-layer tabs 20211 in the thickness direction.
  • one end of the protrusion 1012 is connected to the connection plate 101, the protrusion 1012 passes through the multi-layer tab 20211 and is electrically connected to the multi-layer tab 20211, and the other end of the protrusion 1012 is located on the outer surface of the protection plate 201 Inside, the protrusion 1012 can be formed on the connection plate 101 , and the protrusion 1012 can also be formed on the protection plate 201 , and the protrusion 1012 is electrically connected to the multi-layer tab 20211 .
  • the protrusion 1012 includes two parts: a connecting section 10121 and a piercing section 10122.
  • a connecting section 10121 When the protrusion 1012 is formed on the connecting plate 101, one end of the connecting section 10121 is connected to the connecting plate 101, and the other end of the connecting section 10121 is connected to the piercing section 10122.
  • the protrusion 1012 When the protrusion 1012 is formed on the protective plate 201 , one end of the connecting section 10121 is connected with the protective plate 201 , and the other end of the connecting section 10121 is connected with the piercing section 10122 .
  • the piercing section 10122 is formed with a piercing end, and the piercing end is used to pierce the multi-layer tab 20211 .
  • the multi-layer tabs 20211 are stacked up and down, the protective plate 201 is located on the upper side of the multi-layer tabs 20211, the connecting plate 101 is located on the lower side of the multi-layer tabs 20211, and the protrusion 1012 and The tabs 20211 are electrically connected.
  • the protrusion 1012 When the protrusion 1012 is formed on the connecting plate 101, the upper end of the protrusion 1012 is located in the lower surface of the protective plate 201, and the protrusion 1012 includes two parts: a connecting section 10121 and a piercing section 10122, and the lower part of the protrusion 1012 is a connecting section 10121, the upper part of the protrusion 1012 is a piercing section 10122, the connecting section 10121 is connected to the connecting plate 101, the piercing section 10122 is connected to the upper end of the connecting section 10121, when the protrusion 1012 is formed on the protective plate 201, the lower end of the protrusion 1012 is located at On the upper surface of the connecting plate 101, the upper part of the protrusion 1012 is a connecting section 10121, and the lower part of the protrusion 1012 is a piercing section 10122.
  • the puncture end is easy to pierce the multi-layer tab 20211, and the welding energy is easy to penetrate the connecting plate 101 and the multi-layer tab.
  • Layering the tabs 20211 reduces the difficulty of welding the tabs 20211 , simplifies the welding process for workers, reduces man-hours, labor costs, and prolongs the service life of the current collector assembly 200 .
  • the connecting sections 10121 have the same cross-sectional area, and the connecting sections 10121 are electrically connected to the multi-layer tabs 20211 .
  • the connecting section 10121 has the same cross-sectional area, the piercing section 10122 of the protrusion 1012 is used to pierce the multi-layer tab 20211, and the connecting section 10121 of the protrusion 1012 is used to connect the multi-layer tab 20211, in this way, the welding energy is easy to penetrate the connection plate 101 and the tab 20211, which reduces the difficulty of welding the tab 20211 and the connection plate 101, reduces the man-hours of manufacture, and improves the connection strength between the tab 20211 and the connection plate 101, The connection is stable, ensuring the piercing effect of the protrusion 1012 and improving the connection strength.
  • the piercing section 10122 is formed in the shape of a cone or a frustum of cone. That is to say, the piercing section 10122 can be in the shape of a cone, and the piercing section 10122 can also be in the shape of a truncated cone.
  • the cone tip angle of the cone is greater than 5° and less than 150°, which is more conducive to balancing the connection strength and welding difficulty between the protrusion 1012 and the tab 20211, and avoiding the need to ensure the protrusion.
  • the connection strength between the protrusion 1012 and the tab 20211 ignores the difficulty of welding, or ignores the connection strength between the protrusion 1012 and the tab 20211 in order to reduce the difficulty of welding, so as to ensure the piercing effect of the protrusion 1012 and improve the connection strength.
  • the apex angle of a cone can be: 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150° etc.
  • the ratio between the radius of the top surface and the radius of the bottom surface of the piercing section 10122 is not greater than 0.6. That is to say, the top surface of the piercing section 10122 has a certain angle with the peripheral surface of the piercing section 10122 , and the area of the top surface of the piercing section 10122 is smaller than the area of the bottom surface of the piercing section 10122 .
  • the top surface of the protrusion 1012 is easy to pierce the multi-layer tab 20211 , which ensures the piercing effect of the protrusion 1012 , reduces the melting of the protrusion 1012 during the welding process, and improves the reliability of the battery cell 1000 .
  • the ratio between the radius of the top surface and the radius of the bottom surface of the piercing section 10122 can be: 0.6, 0.55, 0.5, 0.45, 0.4, 0.35, 0.3, 0.25, 0.2, 0.15, 0.1 and so on.
  • the radius of the top surface of the piercing section 10122 is not greater than 1.5mm, and the radius of the bottom surface of the piercing section 10122 is not greater than 2.5mm.
  • the protrusion 1012 extends along a straight line and/or a curve on the surface of the connecting plate 101 or the protective plate 201 , and the section of the piercing section 10122 perpendicular to the extending direction of the protrusion 1012 is formed as a triangle or trapezoid.
  • the protrusion 1012 can extend along a straight line on the surface of the connection plate 101, the protrusion 1012 can also extend along a curve on the surface of the connection plate 101, and the protrusion 1012 can also extend along a curve on the surface of the protection plate 201, and the protrusion 1012 can also extend along a straight line on the surface of the protective plate 201, and the protrusion 1012 on the surface of the connecting plate 101 can also first extend along a straight line and then extend along a curve, or first extend along a curve and then extend along a straight line, or the protrusion 1012
  • the surface of the protective plate 201 may also extend along a straight line first and then extend along a curve, or first extend along a curve and then extend along a straight line.
  • the protrusion 1012 extends along a curve on the upper surface of the connecting plate 101, the protrusion 1012 is formed in a ring shape, and four grooves are formed on the upper part of the protrusion 1012, and the four grooves are formed on the upper part of the protrusion 1012. Evenly spaced, and the four grooves are recessed from the upper end of the protrusion 1012 in the vertical direction, which increases the contact area between the protrusion 1012 and each layer of tabs 20211, increases the flow area, and improves the connection strength.
  • the angle of the piercing end in the cross-section is not greater than 120°. That is, the protrusion 1012 may be a prism.
  • the protrusion 1012 with a triangular cross-section is easier to pierce the multi-layer tab 20211 of the current collector 202, the piercing effect of the protrusion 1012 can be guaranteed, and the angle of the piercing end is not greater than 120°, which can further ensure the piercing of the protrusion 1012 As a result, the difficulty of welding between the tab 20211 and the connecting plate 101 is further reduced.
  • the angle of the puncture end can be: 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55° °, 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115°, 120°, etc.
  • the section along the extension direction of the protrusion 1012 is formed as a triangle, and in the section, the angle of the piercing end is not greater than 120°. That is to say, the protrusion 1012 can be a pyramid, and the protrusion 1012 can also be a cone.
  • the ratio of the upper base to the lower base of the cross section is not greater than 0.6. That is to say, the piercing section 10122 can also be a truss, the piercing section 10122 can also be a prism, the piercing section 10122 can also be a circular platform, the lower bottom of the protrusion 1012 is connected with the connecting plate 101, and the upper bottom of the protrusion 1012 is smaller than the protrusion.
  • the lower bottom of 1012, the piercing effect of the protrusion 1012 can be guaranteed, and the ratio of the upper bottom to the lower bottom of the section is not greater than 0.6, which can further ensure the piercing effect of the protrusion 1012 and further reduce the contact between the tab 20211 and the connecting plate 101. difficulty of welding.
  • the ratio of the upper base to the lower base of the section of the protrusion 1012 can be: 0.6, 0.55, 0.5, 0.45, 0.4, 0.35, 0.3, 0.25, 0.2, 0.15, 0.1 and so on.
  • the upper base of the section of the protrusion 1012 is not greater than 3 mm, and the lower base of the section of the protrusion 1012 is not greater than 5 mm.
  • the upper bottom of the section of the protrusion 1012 can be: 0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.4 mm, 2.6mm, 2.8mm, 3.0mm, etc.
  • the lower bottom of the section of the protrusion 1012 can be: 0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm , 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3.0mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4.0mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5.0 mm and so
  • the plurality of protrusions 1012 are connected to the multi-layer tabs 20211 by ultrasonic welding.
  • the cross-sectional area of the piercing section 10122 gradually decreases, and the apex angle of the piercing section 10122 is not greater than 120°.
  • the cross-sectional area of the piercing section 10122 gradually decreases from bottom to top, the bottom surface of the piercing section 10122 has the largest cross-sectional area, and the top of the piercing section 10122 has the largest cross-sectional area.
  • the cross-sectional area is the smallest, and the protrusion 1012 is easier to pierce the multi-layer tab 20211, which reduces the difficulty of welding the tab 20211 and the connecting plate 101, reduces the welding time between the tab 20211 and the connecting plate 101, and improves production efficiency.
  • the angle of the puncture segment 10122 apex angle can be: 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65° , 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115°, 120°, etc.
  • the height of the piercing section 10122 is not greater than 2 mm.
  • the height of the piercing section 10122 can be: 2mm, 1.8mm, 1.6mm, 1.4mm, 1.2mm, 1mm, 0.8mm, 0.6mm, 0.4mm, 0.2mm and so on.
  • the height of the connecting section 10121 is not greater than 3 mm.
  • the height of the connecting section 10121 can be: 3mm, 2.8mm, 2.6mm, 2.4mm, 2.2mm, 2mm, 1.8mm, 1.6mm, 1.4mm, 1.2mm, 1mm, 0.8mm, 0.6mm, 0.4mm, 0.2mm, etc. Wait.
  • the connection strength between the tab 20211 and the connection plate 101 is improved, the tab 20211 and the connection plate 101 are not easy to be separated, and the yield rate is improved.
  • the connecting section 10121 and the piercing section 10122 make a smooth transition. Due to the friction between the tab 20211 and the protrusion 1012 during the welding process, the protrusion 1012 that smoothly transitions between the connecting section 10121 and the puncture section 10122 is not easy to damage the tab 20211, prolonging the service life of the tab 20211 and ensuring the battery cell 1000 The yield rate improves the safety and reliability of the battery pack.
  • a current collector assembly 200 according to a specific embodiment of the present invention will be described below with reference to FIGS. 1-31 .
  • the protrusion 1012 is formed in a strip shape
  • the current collector assembly 200 has a current collector 202 and a conductive connection assembly 100
  • the upper surface of the connection plate 101 is provided with a plurality of protrusions 1012
  • the plurality of protrusions 1012 are formed on the connection plate.
  • the upper surface of 101 extends along the ultrasonic vibration direction, the thickness of connecting plate 101 is 0.8 mm, the height of protrusion 1012 is 0.6 mm, the distance L2 between two adjacent protrusions 1012 is 2.4 mm, and the connection section 10121 of protrusion 1012
  • the height is 0.4mm
  • the height of the puncture section 10122 of the protrusion 1012 is 0.2mm
  • the length L of the protrusion 1012 is 13mm
  • the width d of the protrusion 1012 is 0.6mm
  • the angle of the top angle of the puncture section 10122 is 67°.
  • Section 10121 has the same cross-sectional area in the up and down direction, and the cross-sectional area of piercing section 10122 gradually decreases in the direction from bottom to top.
  • the protrusion 1012 extends in a straight line on the upper surface of the connecting plate 101. 1012 is integrally formed, and the tab 20211 has three layers, which are respectively from top to bottom: the first conductive layer 202111, the second conductive layer 202112 and the supporting insulating layer 202113.
  • the upper end of 1012 is connected with the protective plate 201 .
  • a current collector assembly 200 according to an embodiment of the fourth aspect of the present invention will be described below with reference to FIGS. 1-35 .
  • the current collector assembly 200 includes: a multi-layer tab 20211 , a protective plate 201 and a connecting plate 101 .
  • the multi-layer tabs 20211 are stacked in the thickness direction of the tabs 20211
  • the protrusions 1012 include a first protrusion 31 and a second protrusion 32
  • the protective plate 201 is provided with a first protrusion 31 (see FIG. 34 ).
  • the protective plate 201 is arranged on one side of the multi-layer tab 20211 in the thickness direction, the first protrusion 31 passes through the multi-layer tab 20211 and is electrically connected with the multi-layer tab 20211, and the connecting plate 101 is provided with a second protrusion 32 (see FIG. 32 ), the connecting plate 101 is arranged on the other side of the multilayer tab 20211 in the thickness direction, and the second protrusion 32 passes through the multilayer tab 20211 and is electrically connected to the multilayer tab 20211 .
  • the first protrusion 31 is located on the protective plate 201
  • the second protrusion 32 is located on the connecting plate 101. Both the first protrusion 31 and the second protrusion 32 pierce the multi-layer tab 20211 and connect with the multi-layer pole.
  • the ears 20211 are electrically connected, the first protrusion 31 pierces the multi-layer tab 20211 and then connects with the connecting plate 101, the second protrusion 32 pierces the multi-layer tab 20211 and connects with the protection plate 201, the protection plate 201 and the connection plate 101 are respectively arranged on both sides of the multi-layer tab 20211 in the thickness direction.
  • the connection strength between the tab 20211 and the protrusion 1012 is further improved, so that the connection is stable and the protrusion 1012 is guaranteed. It has the piercing effect of 1012, increases the contact area between the protrusion 1012 and the tab 20211, stabilizes the reliability of the conductive connection, reduces the failure rate, ensures the yield rate of the battery cell 1000, and also ensures the battery pack Safe use, to avoid accidents.
  • the first protrusions 31 include a plurality, and the plurality of first protrusions 31 are arranged at intervals in the plane where the protective plate 201 is located, and the second protrusions 32 include a plurality, and the plurality of second protrusions 32 are arranged at intervals in the plane where the connecting plate 101 is located.
  • first protrusions 31 are arranged at intervals on the side surface of the protection plate 201 facing the connection plate 101
  • second protrusions 32 are arranged at intervals on the side surface of the connection plate 101 facing the protection plate 201
  • the first protrusion 31 and the second protrusion 32 are respectively provided on the protection plate 201 and the connection plate 101 to ensure the connection stability between the tab 20211 and the protrusion 1012 .
  • the first protrusion 31 is provided on the protective plate 201, and the first protrusion 31 is connected to the connecting plate 101 after passing through the multi-layer lug 20211, the first protrusion 31 can be integrally formed with the protective plate 201, the second The protrusion 32 is provided on the connection plate 101, and the second protrusion 32 is connected to the protection plate 201 after passing through the multi-layer lug 20211.
  • the second protrusion 32 can be integrally formed with the connection plate 101, thus reducing the number of current collector components.
  • the number of components is 200, which improves the overall connection strength of the current collector assembly 200, improves the connection stability between the protrusion 1012 and the tab 20211, reduces the defective rate of the current collector assembly 200, and prolongs the lifetime of the current collector assembly 200. service life.
  • first protrusion 31 and the second protrusion 32 are connected to the protection plate 201 and the connection plate 101 by welding, bonding, inserting or clamping respectively.
  • the welding speed is fast, the welding strength is high, and the sealing is good. It replaces the traditional welding/bonding process. Good electrical conductivity, extremely low or almost zero resistivity, short welding time, no need for any flux, gas, solder, no sparks during welding, environmentally friendly and safe.
  • the first protrusion 31 and the second protrusion 32 are respectively welded on the protective plate 201 and the connection plate 101 by ultrasonic waves.
  • the welding pressure is not less than 20N, and the welding time is not less than 30ms.
  • At least one second protrusion 32 is provided between two adjacent first protrusions 31, or at least one set of A first protrusion 31 is disposed between two adjacent second protrusions 32 .
  • a second protrusion 32 may be arranged between a group of two first protrusions 31, or it may be a group of two first protrusions 31
  • Two second protrusions 32 are arranged between them, one first protrusion 31 may be arranged between a group of two second protrusions 32, and two second protrusions 32 may be arranged between a group of two second protrusions 32.
  • One protrusion 31, etc., can also be multiple groups in some other embodiments.
  • the plurality of first protrusions 31 and the plurality of second protrusions 32 are alternately arranged in a plane perpendicular to the thickness direction of the tab 20211 .
  • one first protrusion 31 and one second protrusion 32 may be alternately arranged, or two first protrusions 31 and two second protrusions 32 may be alternately arranged, or three first protrusions may be arranged 31 and the three second protrusions 32 are arranged in a staggered manner, etc., with a certain regularity, which can ensure a stable connection between the tab 20211 and the protrusion 1012, improve the reliability of the conductive connection, and reduce the failure of the battery cell 1000 Rate.
  • the first protrusion 31 is connected to the connecting plate 101 after passing through the multi-layer tab 20211
  • the second protrusion 32 is connected to the protective plate 201 after passing through the multi-layer tab 20211 . That is to say, the upper end of the first protrusion 31 is connected with the protective plate 201, the lower end of the first protrusion 31 is connected with the connecting plate 101, the upper end of the second protrusion 32 is connected with the protective plate 201, and the lower end of the second protrusion 32 is It is connected with the connecting board 101.
  • the first protrusion 31 and the second protrusion 32 are respectively connected with the connection plate 101 and the protection plate 201 at the same time, which ensures a stable connection of the current collector assembly 200 , improves the yield rate of the battery cell 1000 , and is economical and reliable.
  • the surface of the connecting plate 101 away from the tab 20211 in the thickness direction is the first surface
  • the surface of the protective plate 201 away from the tab 20211 in the thickness direction is the second surface
  • the first protrusion 31 The two ends in the thickness direction of the tab 20211 and the two ends of the second protrusion 32 in the thickness direction of the tab 20211 are both located inside the first surface and inside the second surface. In short, both the first protrusion 31 and the second protrusion 32 are located between the connection plate 101 and the protection plate 201 .
  • any one of the first protrusion 31 and the second protrusion 32 includes: a connecting section 10121 and a piercing section 10122 connected in the height direction, one end of the connecting section 10121 is connected to the connecting plate 101 or The protective plates 201 are connected, and the piercing section 10122 is connected to the other end of the connecting section 10121 , and the piercing section 10122 is configured to pierce the multi-layer tab 20211 .
  • first protrusion 31 includes a connecting section 10121 and a piercing section 10122 connected in the height direction
  • second protrusion 32 includes a connecting section 10121 and a piercing section 10122 connected in the height direction
  • Both the first protrusion 31 and the second protrusion 32 include a connecting section 10121 and a piercing section 10122 connected in the height direction.
  • the first protrusion 31 includes a connecting segment 10121 and a piercing segment 10122 connected in the height direction
  • the lower end of the first protrusion 31 is located in the upper surface of the connecting plate 101
  • the upper part of the first protrusion 31 is the connecting segment 10121
  • the lower part of the first protrusion 31 is a piercing section 10122
  • the connecting section 10121 is connected to the protective plate 201
  • the piercing section 10122 is connected to the lower end of the connecting section 10121
  • the piercing section 10122 is formed with a piercing end
  • the piercing end is used to pierce the multi-layer tab 20211.
  • the second protrusion 32 includes a connecting section 10121 and a piercing section 10122 connected in the height direction
  • the upper end of the second protrusion 32 is located in the lower surface of the protective plate 201
  • the lower part of the second protrusion 32 is the connecting section 10121
  • the upper part of the second protrusion 32 is a piercing section 10122
  • the connecting section 10121 is connected to the connecting plate 101
  • the piercing section 10122 is connected to the upper end of the connecting section 10121
  • the piercing section 10122 is formed with a piercing end
  • the piercing end is used to pierce the multi-layer tab 20211.
  • a current collector assembly 200 according to a specific embodiment of the present invention will be described in detail below with reference to FIGS. 1-35 .
  • both the first protrusion 31 and the second protrusion 32 are formed in a strip shape
  • the current collector assembly 200 has a multi-layer tab 20211, a protection plate 201 and a connection plate 101
  • the protection plate 201 is provided with a first protrusion
  • the connecting plate 101 is provided with a second protrusion 32
  • the thickness of the connecting plate 101 is 0.8 mm
  • the length L of the second protrusion 32 is 13 mm
  • the width d of the second protrusion 32 is 0.6 mm
  • the height of 32 is 0.6mm
  • the height of the second connection section 10121 of the protrusion 1012 is 0.4mm
  • the height of the puncture section 10122 of the second protrusion 32 is 0.2mm
  • the angle of the apex of the puncture section 10122 is 67°.
  • Section 10121 has the same cross-sectional area in the up-down direction, and the cross-sectional area of piercing section 10122 decreases gradually in the direction from bottom to top.
  • the protrusion 1012 extends in a straight line on the upper surface of the connecting plate 101.
  • the protrusions 32 are integrally formed, the protective plate 201 is integrally formed with a plurality of first protrusions 31, and the tab 20211 has three layers, which are respectively from top to bottom: a first conductive layer 202111, a second conductive layer 202112 and a supporting insulating layer 202113 , the protection plate 201 is disposed above the multi-layer lug 20211 , and the first protrusion 31 and the second protrusion 32 are respectively connected to the connecting plate 101 and the protection plate 201 .
  • the current collector assembly 200 includes:
  • Multi-layer tabs 20211 the multi-layer tabs 20211 are stacked in the thickness direction of the tabs 20211;
  • the protective plate 201, the protective plate 201 is arranged on one side of the multi-layer tab 20211 in the thickness direction;
  • connection plate 101, the connection plate 101 is arranged on the other side of the multi-layer tab 20211 in the thickness direction;
  • the protrusion 1012 is disposed between the connecting plate 101 and the protective plate 201 , the protrusion 1012 passes through the multi-layer tab 20211 and is electrically connected to the multi-layer tab 20211 .
  • the current collector assembly 200 of the present invention by providing the protrusion 1012, the welding difficulty of the tab 20211 is reduced, the welding process of the worker is simplified, the manufacturing time is reduced, the labor cost is reduced, and the distance between the tab 20211 and the connecting plate 101 is improved.
  • the connection strength between the two, the connection is stable, the protective plate 201 is set to protect the tab 20211 from being damaged during welding, and the protrusion 1012 and the protective plate 201 are provided to ensure the welding strength of the tab 20211 and protect the tab 20211 from damage. In case of damage, ensure the overcurrent capability of the tab 20211.
  • the battery cell 1000 according to the embodiment of the fifth aspect of the present invention includes the current collector assembly 200 of any embodiment of the above-mentioned first aspect to the fourth aspect of the present invention.
  • the battery cell 1000 of the embodiment of the present invention by applying the current collector assembly 200 of the above-mentioned embodiment to the battery cell 1000, the difficulty of assembling the battery cell 1000 is reduced, and the manufacturing hours of the battery cell 1000 are reduced. The labor cost is reduced, and the reliability of the battery cell 1000 is guaranteed.
  • the battery pack according to the embodiment of the sixth aspect of the present invention includes the battery cell 1000 according to the embodiment of the fifth aspect of the present invention.
  • the safety performance of the battery pack is improved, the reliability of the battery pack is ensured, and the occurrence of danger is avoided by providing the battery cell 1000 in the embodiment of the second aspect above.
  • first and second are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as “first” and “second” may explicitly or implicitly include one or more of these features.
  • “plurality” means two or more, unless otherwise specifically defined.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种集流体组件(200)、电池单体(1000)和电池包，所述集流体组件(200)包括：多层极耳(20211)、保护板(201)、连接板(101)和凸起(1012)。多层极耳(20211)在极耳(20211)的厚度方向层叠布置；保护板(201)设在多层极耳(20211)在厚度方向的其中一侧，连接板(101)设在多层极耳(20211)在厚度方向的另一侧；凸起(1012)设在连接板(101)和保护板(201)之间，凸起(1012)穿过多层极耳(20211)并与多层极耳(20211)电连接。

Description

集流体组件、电池单体和电池包
优先权信息
本发明请求2021年07月14日向中国国家知识产权局提交的、专利申请号为202110798340.3、202110798108.X、202110798222.2、202110798225.6、202121603148.6、202121604602.X、202121604710.7、202121604477.2的专利申请的优先权和权益，并且通过参照将其全文并入此处。
技术领域
本发明涉及电池技术领域，尤其是涉及一种集流体组件、电池单体和电池包。
背景技术
相关技术中指出，单层极耳通过超声波辊焊的方式在复合极耳两侧焊接铜箔，焊接的铜箔在焊接在软连接上。该焊接方式每一层极耳都需要焊接，因此增加了焊接成本，以及铜箔的材料成本。焊接后，焊接部位易受到损伤。
发明内容
本发明旨在至少解决现有技术中存在的技术问题之一。为此，本发明在于提出一种集流体组件、电池单体和电池包，所述集流体组件设计巧妙，降低极耳的焊接难度，保护极耳免于受损。
本发明还提出一种电池单体。
本发明还提出一种电池包。
根据本发明的集流体组件，包括：
多层极耳，多层所述极耳在所述极耳的厚度方向层叠布置；
保护板，所述保护板设在所述多层极耳在厚度方向的其中一侧；
连接板，所述连接板设在所述多层极耳在厚度方向的另一侧；
凸起，设在所述连接板和所述保护板之间，所述凸起穿过多层所述极耳并与多层所述极耳电连接。
根据本发明的集流体组件，通过设置凸起，降低极耳的焊接难度，简化了工人的焊接过程，减少了制作工时，降低了人工成本，提高了极耳与连接板之间的连接强度，连接稳固，设置保护板，保护极耳在焊接时免于受损，通过设置凸起以及保护板，既保证了极耳焊接强度，又保护极耳免于受损，保证极耳的过流能力。
根据本发明第一方面的集流体组件，所述凸起的一端与所述连接板相连，所述凸起的另一端位于所述保护板的外侧表面的内侧。
根据本发明的集流体组件，通过设置覆盖凸起的保护板，避免了凸起的顶部超出保护板，从而避免了凸起受到损伤，延长了集流体组件的使用寿命，提高了极耳与凸起之间的连接强度，连接稳固，降低了在运输或使用过程中极耳与凸起发生脱离的可能性，保证了电池单体的可靠性，降低了故障率，也保证了电池包的使用安全性，避免了事故的发生。
在一些实施例中，所述凸起的所述另一端与所述保护板相连。
在一些实施例中，所述凸起的所述另一端固定于所述保护板的内侧表面。
在一些实施例中，所述凸起设于所述连接板上，且所述凸起穿过多层所述极耳后与所述保护板相连。
在一些实施例中，所述凸起设于所述保护板上，且所述凸起穿过多层所述极耳后与所述连接板相连。
进一步地，在所述极耳的厚度方向上，所述凸起的高度在0.1mm到3mm范围。
进一步地，所述集流体组件包括多个所述凸起，多个所述凸起呈矩阵式布置。
进一步地，在垂直于所述极耳厚度方向的平面内，所述凸起沿直线和/或曲线延伸。
更进一步地，多个所述凸起通过超声波焊接与多层所述极耳相连，且多个所述凸起在超声波振动方向上排列的密集程度大于其他方向的密集程度。
更进一步地，所述极耳包括：支撑绝缘层和分别覆盖在所述支撑绝缘层厚度方向两侧表面的第一导电层和第二导电层。
根据本发明第二方面的集流体组件，所述集流体组件包括导电连接组件，所述导电连接组件包括保 护板和连接板，；其中，所述连接板和所述保护板中的至少一个上设有凸起，所述凸起通过高频振动刺穿多层所述极耳并与多层所述极耳电连接，所述高频振动的频率在15KHz-40KHz范围。
根据本发明的集流体组件，通过高频振动使得凸起刺穿多层极耳，高频振动作用于焊接物的接触面，使两个物体表面相互摩擦从而产生热量，形成分子层之间的熔合，进而提升了凸起与多层极耳之间的焊接速度，保证了极耳与连接板之间稳固连接，延长了集流体组件的使用寿命。
在一些实施例中，所述高频振动的振幅在5um到100um范围内。
在一些实施例中，所述凸起在所述连接板或所述保护板的表面延伸，所述高频振动的振动方向平行于所述凸起的延伸方向。
在一些实施例中，所述高频振动为超声波焊接产生的振动。
在一些实施例中，所述连接板上设有所述凸起，所述凸起的一端与所述连接板相连，设在所述连接板上的所述凸起通过高频振动刺穿多层所述极耳并与多层所述极耳电连接，所述凸起的另一端与所述保护板相连。
进一步地，所述凸起的所述另一端通过超声波焊接固定于所述保护板的内侧表面或嵌入保护板内。
进一步地，所述保护板上设有所述凸起，且设在所述保护板的所述凸起通过高频振动刺穿多层所述极耳后与所述连接板相连。
进一步地，所述连接板和所述保护板中的至少一个上设有多个所述凸起，多个所述凸起呈矩阵式布置。
进一步地，多个所述凸起在所述高频振动的振动方向上排列的密集程度大于除所述高频振动的振动方向外的其他方向的密集程度。
更进一步地，多个所述凸起沿所述高频振动的振动方向延伸且在垂直于所述高频振动的振动方向间隔布置。
根据本发明第三方面的集流体组件，所述集流体组件包括导电连接组件，所述导电连接组件包括保护板和连接板，；其中，所述连接板和所述保护板中的至少一个上设有凸起，所述凸起包括在高度方向相连的连接段和穿刺段，所述连接段的一端与所述连接板或所述保护板相连，所述穿刺段连接在所述连接段的另一端，所述穿刺段构造成适于刺穿所述多层极耳，所述凸起与多层所述极耳电连接。
根据本发明的集流体组件，通过将具有穿刺段的凸起设置于集流体组件上，穿刺端易于刺穿多层极耳，焊接能量易于穿透连接板和多层极耳，降低了极耳的焊接难度，简化了工人的焊接过程，减少了制作工时，降低了人工成本，延长了集流体组件的使用寿命。
在一些实施例中，所述连接段的截面面积相同，所述连接段与多层所述极耳电连接。
在一些实施例中，所述穿刺段形成为圆锥体形状或圆台形形状。
在一些实施例中，所述凸起在所述连接板或所述保护板的表面沿直线和/或曲线延伸，所述穿刺段垂直于所述凸起延伸方向的截面形成为三角形或梯形。
在一些实施例中，在所述凸起的高度方向上，所述穿刺段的截面面积逐渐减小，且所述穿刺段的顶角不大于120°。
进一步地，在所述凸起的高度方向上，所述穿刺段的高度不大于2mm。
进一步地，所述连接段与所述穿刺段平滑过渡。
更进一步地，所述连接板和所述保护板中的至少一个上设有多个所述凸起，多个所述凸起呈矩阵式布置。
根据本发明第四方面的集流体组件，所述凸起包括第一凸起和第二凸起；所述保护板上设有第一凸起，所述第一凸起穿过多层所述极耳并与多层所述极耳电连接；所述连接板上设有第二凸起，所述第二凸起穿过多层所述极耳并与多层所述极耳电连接。
根据本发明的集流体组件，通过在保护板和连接板上同时设置凸起，进一步提高了极耳与凸起之间的连接强度，使得连接稳固，保证了凸起的刺穿效果，增加了凸起与极耳之间的接触面积，稳定了导电连接的可靠性，降低了故障率，保证了电池单体的良品率，也保证了电池包的使用安全性，避免了事故的发生。
在一些实施例中，所述保护板设有多个所述第一凸起，多个所述第一凸起在所述保护板所在平面内间隔设置，所述连接板设有多个所述第二凸起，多个所述第二凸起在所述连接板所在平面内间隔设置。
在一些实施例中，在垂直于所述极耳厚度方向的平面内，至少一组相邻的两个所述第一凸起之间设有一个第二凸起，或，至少一组相邻的两个第二凸起之间设有一个第一凸起。
在一些实施例中，多个所述第一凸起和多个所述第二凸起在垂直于所述极耳厚度方向的平面内交错布置。
在一些实施例中，所述第一凸起穿过多层所述极耳后与所述连接板连接，所述第二凸起穿过多层所述极耳后与所述保护板连接。
在一些实施例中，所述连接板在厚度方向上背离所述极耳的表面为第一表面，所述保护板在厚度方向上背离所述极耳的表面为第二表面，所述第一凸起在所述极耳的厚度方向上的两端和所述第二凸起在极耳厚度方向的两端均位于所述第一表面的内侧以及所述第二表面的内侧。
进一步地，所述第一凸起和所述第二凸起中的任一个均包括：在高度方向相连的连接段和穿刺段，所述连接段的一端与所述连接板或保护板相连，所述穿刺段连接在所述连接段的另一端，所述穿刺段构造成适于刺穿所述多层极耳。
进一步地，所述连接段的截面面积相同，所述连接段与多层所述极耳电连接。
更进一步地，所述集流体组件包括极片，所述极片包括集流体和多个所述极耳，多个所述极耳层叠设置；所述极片包括：支撑绝缘层和分别覆盖在所述支撑绝缘层厚度方向两侧表面的第一导电层和第二导电层。
根据本发明第五方面的电池单体，包括本发明上述第一方面至第四方面任一的集流体组件。
根据本发明的电池单体，通过将设置上述第一方面的集流体组件应用至电池单体，从而降低了电池单体的装配难度，减少了电池单体的制作工时，降低了人工成本，保证了电池单体的可靠性。
根据本发明第六方面的电池包，包括根据本发明上述第五方面的电池单体。
根据本发明的电池包，通过设置上述第五方面的电池单体，从而提升了电池包的安全性能，保证了电池包的可靠性，避免了危险的发生。
本发明的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。
附图说明
本发明的上述和/或附加的方面和优点从结合下面附图对实施方式的描述中将变得明显和容易理解，其中：
图1是根据本发明第一方面实施例的集流体组件的示意图；
图2是图1中所示的集流体组件的侧视图的示意图；
图3是图1中所示的连接板的示意图；
图4是图3中所示的连接板的侧视图的示意图；
图5是图4中所示的凸起的局部放大图；
图6是图1中所示的另一实施例的连接板的示意图；
图7是图1中所示的又一实施例的连接板的示意图；
图8是图1中所示的连接板的示意图，其中，凸起形成为圆锥体；
图9是图8中所示的连接板的侧视图的示意图；
图10是图1中所示的再一实施例的连接板的示意图；
图11是图10中所示的连接板的侧视图的示意图；
图12是图1中所示的连接板的示意图，其中，凸起包括连接段和穿刺段；
图13是图12中所示的连接板的侧视图的示意图；
图14是图1中所示的连接板的示意图，其中，凸起形成为棱锥体；
图15是图14中所示的连接板的侧视图的示意图；
图16是图1中所示的一个具体实施例的连接板的示意图；
图17是图16中所示的连接板的侧视图的示意图；
图18是图16中所示的集流体组件的侧视图的示意图；
图19是根据本发明第二方面实施例的电池单体的示意图；
图20是图19中所示的集流体组件的示意图；
图21是图19中所示的连接板的示意图；
图22是图20中所示的连接板的俯视图的示意图；
图23是另一个实施例的电池单体的示意图；
图24是图23中所示的集流体组件的示意图；
图25是图23中所示的连接板的示意图；
图26是图25中所示的连接板的俯视图的示意图；
图27是又一个实施例的电池单体的示意图；
图28是图27中所示的集流体组件的示意图；
图29是图27中所示的连接板的示意图；
图30是图29中所示的连接板的俯视图的示意图；
图31是集流体的示意图。
图32是图1中所示的集流体组件的侧视图的示意图；
图33是集流体组件的示意图，其中，第一凸起形成于保护板上；
图34是图33所示的集流体组件的侧视图的示意图；
图35是图34中所示的保护板的示意图。
附图标记：
导电连接组件100，连接板101，
凸起1012，连接段10121，穿刺段10122，
第一凸起31，第二凸起32，
集流体组件200，保护板201，
集流体202，极片2021，极耳20211，
第一导电层202111，第二导电层202112，支撑绝缘层202113，
电池单体1000。
具体实施方式
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。
下面参考图1-图31描述根据本发明第一方面实施例的集流体组件200。
如图1-图31所示，根据本发明第一方面实施例的集流体组件200，包括：多层极耳20211、保护板201、连接板101和凸起1012。
具体地，集流体组件200包括多层极耳20211、保护板201、连接板101和凸起1012。多层极耳20211在极耳20211的厚度方向层叠布置，保护板201设在多层极耳20211在厚度方向的其中一侧，连接板101设在多层极耳20211在厚度方向的另一侧，凸起1012的一端与连接板101相连，凸起1012穿过多层极耳20211并与多层极耳20211电连接，凸起1012的另一端位于保护板201的外侧表面的内侧。
也就是说，在极耳20211的厚度方向上(例如图2所示上下方向上)，多层极耳20211层叠设置，保护板201设置在多层极耳20211的一侧(例如图2所示多层极耳20211的上侧)，连接板101设置在多层极耳20211的另一侧(例如图2所示多层极耳20211的下侧)，连接板101与凸起1012的一端(例如图2所示凸起1012的下端)相连，凸起1012刺穿多层极耳20211，并且凸起1012与多层极耳20211电连接，凸起1012的另一端(例如图2所示凸起1012的上端)位于保护板201朝向连接板101的一层表面内。由此，避免了凸起1012受到损伤，延长了多层极耳20211的使用寿命。
参照图2所示，在上下方向上，多层极耳20211上下层叠设置，保护板201位于多层极耳20211的上侧，连接板101位于多层极耳20211的下侧，连接板101与凸起1012的下端相连，凸起1012的上端 适于刺穿多层极耳20211，凸起1012与极耳20211之间为电连接，凸起1012的上端位于保护板201的下侧表面内。可以理解的是，凸起1012被保护板201所覆盖。
根据本发明实施例的集流体组件200，通过设置覆盖凸起1012的保护板201，避免了凸起1012的顶部超出保护板201，从而避免了凸起1012受到损伤，延长了集流体组件200的使用寿命，提高了极耳20211与凸起1012之间的连接强度，连接稳固，降低了在运输或使用过程中极耳20211与凸起1012发生脱离的可能性，保证了电池单体1000的可靠性，降低了故障率，也保证了电池包的使用安全性，避免了事故的发生。
在本发明的一些实施例中，凸起1012的另一端与保护板201相连。参照图2所示，凸起1012的上端与保护板201相连，凸起1012与保护板201可以通过焊接连接、粘接、卡接、插接等等方式相连。
进一步地，凸起1012的另一端固定于保护板201的内侧表面。参照图2所示，凸起1012的上端固定于保护板201的下侧表面。这样，进一步提高了极耳20211与凸起1012的连接强度，避免极耳20211与凸起1012发生脱离，使得集流体组件200的结构更稳固，保证了集流体组件200的生产良品率，提高了电池单体1000的良品率，降低了电池包的危险性，使用更安全。
在本发明的一些实施例中，凸起1012设于连接板101上，且凸起1012穿过多层极耳20211后与保护板201相连，凸起1012可以与连接板101一体成型，这样，减少了集流体组件200的零部件数量，提高了集流体组件200的整体的连接强度，提升了凸起1012与极耳20211的连接稳定性，降低了集流体组件200的不良品率，延长了集流体组件200的使用寿命。
在本发明的另一些实施例中，连接板101与凸起1012采用分体设置，凸起1012通过焊接、粘接、插接或卡接于连接板101上，这样，连接板101与凸起1012为两个独立的部件，降低了集流体组件200的生产难度，减少了集流体组件200的生产成本，提高了凸起1012与极耳20211焊接过程中的容错率。
优选地，凸起1012通过焊接的方式与连接板101相连，连接方式简单，且凸起1012与连接板101连接稳固，不易损坏。
具体地，凸起1012可以通过电磁脉冲焊接的方式与连接板101相连；多个凸起1012也可以通过摩擦焊接的方式与连接板101相连；多个凸起1012还可以通过超声波焊接的方式与连接板101相连。
在本发明的又一些实施例中，凸起1012设于保护板201上，且凸起1012穿过多层极耳20211后与连接板101相连，凸起1012可以与保护板201一体成型，这样，减少了集流体组件200的零部件数量，提高了集流体组件200的整体的连接强度，提升了凸起1012与极耳20211的连接稳定性，降低了集流体组件200的不良品率，延长了集流体组件200的使用寿命。
在本发明的另一些实施例中，保护板201与凸起1012采用分体设置，凸起1012通过焊接、粘接、插接或卡接于保护板201上，这样，保护板201与凸起1012为两个独立的部件，降低了集流体组件200的生产难度，减少了集流体组件200的生产成本，提高了凸起1012与极耳20211焊接过程中的容错率。
优选地，凸起1012通过焊接的方式与保护板201相连，连接方式简单，且凸起1012与保护板201连接稳固，不易损坏。
具体地，凸起1012可以通过电磁脉冲焊接的方式与保护板201相连；多个凸起1012也可以通过摩擦焊接的方式与保护板201相连；多个凸起1012还可以通过超声波焊接的方式与保护板201相连。
在本发明的一些实施例中，在极耳20211的厚度方向上，凸起1012的高度在0.1mm到3mm范围。也就是说，凸起1012凸出于连接板101的高度在0.1mm到3mm范围，这样，既避免了材料的浪费，又能够保证了极耳20211与连接板101的连接强度，以及电池单体1000的整体结构便于装配成为电池包，节省了安装空间，使得结构紧凑，缩小了电池包的体积，降低了运输成本。
例如，凸起1012的高度可以为：0.1mm、0.15mm、0.2mm、0.4mm、0.55mm、0.6mm、0.85mm、1.0mm、1.1mm、1.2mm、1.35mm、1.4mm、1.5mm、1.6mm、1.7mm、1.8mm、2.0mm、2.2mm、2.45mm、2.6mm、2.7mm、2.8mm、2.9mm、3.0mm等等。
在本发明的一些实施例中，凸起1012的宽度在0.1mm-3mm范围内，由此，既避免了材料浪费，又能够保证了极耳20211与连接板101的连接稳定性。例如，凸起1012的宽度可以为：0.1mm、0.15mm、0.2mm、0.3mm、0.4mm、0.55mm、0.6mm、0.85mm、1.0mm、1.1mm、1.2mm、1.3mm、1.35mm、1.4mm、 1.5mm、1.6mm、1.7mm、1.8mm、1.9mm、2.0mm、2.1mm、2.2mm、2.3mm、2.45mm、2.6mm、2.7mm、2.8mm、2.9mm、3.0mm等等。
在本发明的一些实施例中，集流体组件200包括多个凸起1012，多个凸起1012呈矩阵式布置。阵列排布的多个凸起1012提高了极耳20211与凸起1012的连接强度，避免了在运输或者使用过程中极耳20211与凸起1012相互脱离，提升了电池单体1000的良品率，增加了凸起1012与每层极耳20211之间的接触面积，增大了过流面积，散热均衡，电池包不易发生故障，降低了使用者的危险系数，提高了使用者的使用感受。
在本发明的一些实施例中，凸起1012在连接板101的表面上沿直线和/或曲线延伸。也就是说，凸起1012在连接板101的表面上可以是沿直线延伸，凸起1012在连接板101的表面上也可以是沿曲线延伸，凸起1012在连接板101的表面上还可以是先沿直线延伸再沿曲线延伸，或者先沿曲线延伸再沿直线延伸。由此，满足了不同的复合集流体202的焊接需求，提高了极耳20211与连接板101之间的连接强度，扩展了连接板101的使用范围，降低了连接板101的生产成本。
可选地，多个凸起1012通过超声波焊接与多层极耳20211相连。
参照图29所示，凸起1012在连接板101的上表面沿曲线延伸，凸起1012形成为环形，在凸起1012的上部形成有四个凹槽，四个凹槽在凸起1012的上部均匀间隔布置，且四个凹槽在竖直方向上由凸起1012的上端面向下凹陷，增加了凸起1012与每层极耳20211之间的接触面积，增大了过流面积，提高了连接强度。
在本发明的一些实施例中，多个凸起1012在超声波振动方向上排列的密集程度大于其他方向的密集程度。也就是说，多个凸起1012朝向背离连接板101的方向上凸出，多个凸起1012在超声波振动方向上排列的密集程度最大，多个凸起1012在除了超声波振动方向外的其他方向上的密集程度小于多个凸起1012在超声波振动方向上的密集程度。
使用超声波焊接时，超声波作用于焊接物的接触面会产生每秒几万次的高频振动，沿超声波的振动方向密集排列多个凸起1012，凸起1012易于刺穿多层极耳20211，焊接能量穿透连接板101和极耳20211时更容易，降低了极耳20211与连接板101的焊接难度。
进一步地，多个凸起1012在连接板101的表面阵列布置，在沿超声波振动方向上多个凸起1012排列的密集程度最大。这里需要说明的是，当多个凸起1012在超声波振动方向上排列的密度足够大时，凸起1012形成为在超声波振动方向上延伸的长条形。
在本发明的一些实施例中，在超声波振动方向上相邻的两个凸起1012之间的间距为L1，在垂直于超声波振动方向上相邻两个凸起1012之间的间距为L2，其中，L1和L2满足：0.5mm≤L1≤10mm，0.5mm≤L2≤10mm，且L1≤L2。也就是说，在超声波振动方向上相邻的两个凸起1012之间的间距不大于在垂直于超声波振动方向上相邻两个凸起1012之间的间距，即多个凸起1012在垂直于超声波振动方向的方向上排列的密集程度小于超声波振动方向上排列的密集程度。这样，进一步提升了焊接速度，提高了生产效率，降低了生产成本，优化了凸起1012的排列方式，避免了极耳20211与连接板101之间存在不牢固的焊接点，提高了产品质量。
例如，在超声波振动方向上相邻的两个凸起1012之间的间距L1可以为：0.5mm、0.7mm、0.9mm、1mm、1.5mm、2mm、2.5mm、3mm、3.5mm、4mm、4.5mm、5mm、5.5mm、6mm、6.5mm、7mm、7.5mm、8mm、8.5mm、9mm、9.5mm、10mm等等。在垂直于超声波振动方向上相邻两个凸起1012之间的间距L2可以为：0.5mm、0.7mm、0.9mm、1mm、1.5mm、2mm、2.5mm、3mm、3.5mm、4mm、4.5mm、5mm、5.5mm、6mm、6.5mm、7mm、7.5mm、8mm、8.5mm、9mm、9.5mm、10mm等等。
在本发明的一个实施例中，多个凸起1012在连接板101的表面沿超声波振动方向延伸且在垂直于超声波振动的方向上间隔布置。参照图3所示，多个凸起1012在连接板101的上表面沿超声波的振动方向延伸，并且在垂直于超声波振动方向的方向上间隔布置，凸起1012形成为长条形，增大了极耳20211与凸起1012之间的接触面积，避免了极耳20211与凸起1012焊接不牢固，提高了极耳20211与连接板101之间的连接强度。
在本发明的一些实施例中，在垂直于超声波振动的方向上，相邻两个凸起1012之间的间距L2不小 于凸起1012的宽度d。也就是说，在垂直于超声波振动方向的方向上相邻两个凸起1012之间的间距L2大于等于凸起1012的宽度d，L2可以大于d，L2也可以等于d。由此，能够明确区分连接板101焊接时的放置方向，将凸起1012间距较宽的方向朝向垂直于超声波振动方向的方向放置，既能提高生产效率，又能使得凸起1012与极耳20211焊接的更牢固。
在本发明的一些实施例中，凸起1012在超声波振动方向的长度为L，凸起1012在垂直于超声波振动方向上的宽度为d，其中，L和d满足：L*2+d*2≥X，X为极耳20211的宽度。可以理解的是，凸起1012的周长应不小于极耳20211的宽度。这里需要说明的是，极耳20211的宽度X为极耳20211垂直于超声波振动方向上的边长，参照图16所示，极耳20211左右方向上的长度为极耳20211的宽度。
在本发明的一些实施例中，连接板101与凸起1012采用相同的材料制成。由于材质不同，导体的耐温和电阻等参数也不相同，存在较大的安全隐患，而使用相同的材质，则保证了电池单体1000的可靠性，降低了故障率，也保证了电池包的使用安全性，避免了事故的发生。
可选地，连接板101采用T2纯铜或铜合金等等。
在另一些实施例中，导电连接组件100包括：连接板101和凸起1012，连接板101用于通过超声波焊接与集流体202的多层极耳20211相连，连接板101包括：连接板101和设于连接板101上的凸起1012，凸起1012凸出于连接板101在厚度方向的其中一侧表面，导电连接组件100包括多个凸起1012，多个凸起1012穿过多层极耳20211。
在一些实施例中，极耳20211包括：支撑绝缘层202113和分别覆盖在支撑绝缘层202113厚度方向两侧表面的第一导电层202111和第二导电层202112。参照图31所示，支撑绝缘层202113位于第一导电层202111和第二导电层202112之间，第一导电层202111和第二导电层202112分别覆盖在支撑绝缘层202113的上层表面和下层表面上。
可选地，支撑绝缘层202113为复合高分子绝缘层。
在另一些实施例中，参照图5所示，凸起1012包括两部分：连接段10121和穿刺段10122，凸起1012的下部为连接段10121，凸起1012的上部为穿刺段10122，连接段10121与连接板101相连，穿刺段10122连接在连接段10121的上端。
具体地，凸起1012的穿刺段10122用于刺穿多层极耳20211，凸起1012的连接段10121用于连接多层极耳20211，这样，焊接能量易于穿透连接板101和极耳20211，降低了极耳20211与连接板101的焊接难度，减少了制作工时，提高了极耳20211与连接板101之间的连接强度，连接稳固，保证了凸起1012的刺穿效果的同时，提升连接强度。
下面将参考图1-图31描述根据本发明一个具体实施例的集流体组件200。
参照图16，凸起1012形成为长条形，集流体组件200具有多层极耳20211、保护板201、连接板101和多个凸起1012，每个凸起1012向上凸出于连接板101的上表面，并且多个凸起1012在连接板101的上表面沿超声波振动方向延伸，连接板101的厚度为0.8mm，凸起1012的长度L为13mm，凸起1012的宽度d为0.6mm，凸起1012的高度为0.6mm，相邻两个凸起1012的间距L2为2.4mm，凸起1012在连接板101的上表面沿直线延伸，连接板101与多个凸起1012一体成型，极耳20211具有三层，从上向下分别是：第一导电层202111、第二导电层202112和支撑绝缘层202113，保护板201设在多层极耳20211的上方，凸起1012的上端与保护板201相连。
下面参考图1-图31描述根据本发明第二方面实施例的集流体组件200。
如图1-图31所示，根据本发明第二方面实施例的集流体组件200，包括：集流体202和导电连接组件100。
具体地，集流体组件200包括：集流体202和导电连接组件100，集流体202包括多层极耳20211，多层极耳20211在极耳20211的厚度方向层叠布置，导电连接组件100包括保护板201和连接板101，保护板201设在多层极耳20211在厚度方向的其中一侧，连接板101设在多层极耳20211在厚度方向的另一侧，其中，连接板101和保护板201中的至少一个上设有凸起1012，凸起1012通过高频振动刺穿多层极耳20211并与多层极耳20211电连接，高频振动的频率在15KHz-40KHz范围。在一个实施例中，连接板101上设有凸起1012。在一个实施例中，保护板201上设有凸起1012。在一个实施例中，连接板101 和保护板201上均设有凸起1012。
也就是说，多层极耳20211在极耳20211的厚度方向层叠布置，保护板201设在多层极耳20211在厚度方向的其中一侧，连接板101设在多层极耳20211在厚度方向的另一侧，凸起1012的一端与连接板101相连，凸起1012穿过多层极耳20211并与多层极耳20211电连接，凸起1012的另一端位于保护板201的外侧表面的内侧，凸起1012可以形成于连接板101上，凸起1012也可以形成于保护板201上，凸起1012通过振动频率范围在15KHz-40KHz之间的高频振动刺穿多层极耳20211。
例如，高频振动的振动频率可以为：15KHz、20KHz、25KHz、30KHz、35KHz、40KHz等等。
根据本发明实施例的集流体组件200，通过高频振动使得凸起1012刺穿多层极耳20211，高频振动作用于焊接物的接触面，使两个物体表面相互摩擦从而产生热量，形成分子层之间的熔合，进而提升了凸起1012与多层极耳20211之间的焊接速度，保证了极耳20211与连接板101之间稳固连接，延长了集流体组件200的使用寿命。
在本发明的一些实施例中，当高频振动的振幅在5um到100um范围内时，能够进一步提升焊接效果，进一步提高焊接速度，进一步降低焊接难度。例如，高频振动的振幅可以为：5um、10um、15um、20um、25um、30um、35um、40um、45um、50um、55um、60um、65um、70um、75um、80um、85um、90um、95um、100um等等。
在本发明的一些实施例中，凸起1012在连接板101或保护板201的表面延伸，高频振动的振动方向平行于凸起1012的延伸方向。也就是说，凸起1012可以在连接板101表面延伸，凸起1012也可以在保护板201表面延伸，凸起1012的延伸方向与高频振动的方向平行，凸起1012延伸方向与高频振动方向一致，有助于加快凸起1012与极耳20211的焊接速度，减少生产时间，提高生产效率。
参照图29所示，凸起1012在连接板101的上表面沿曲线延伸，凸起1012形成为环形，在凸起1012的上部形成有四个凹槽，四个凹槽在凸起1012的上部均匀间隔布置，且四个凹槽在竖直方向上由凸起1012的上端面向下凹陷，增加了凸起1012与每层极耳20211之间的接触面积，增大了过流面积，提高了连接强度。
在本发明的一些实施例中，优选地，高频振动为超声波焊接产生的振动。由于超声波焊接，焊接速度快，焊接强度高、密封性好，取代了传统的焊接/粘接工艺，成本低廉，清洁无污染且不会损伤软连接片和极耳20211，焊接过程稳定，焊接后导电性好，电阻系数极低或近乎零，焊接时间短，不需任何助焊剂、气体、焊料，焊接过程中不产生火花，环保安全。
在一些实施例中，超声波的焊接压力不小于20N，焊接时间不小于30ms。
在本发明的一个实施例中，连接板101上设有凸起1012，凸起1012的一端与连接板101相连，设在连接板101上的凸起1012通过高频振动刺穿多层极耳20211并与多层极耳20211电连接，凸起1012的另一端与保护板201相连。参照图2所示，凸起1012的下端与连接板101相连，凸起1012在超声波焊接的高频振动下刺穿多层极耳20211，并且凸起1012与多层极耳20211为电连接。这样，焊接时极耳20211在自身重力的作用下，凸起1012更容易刺穿多层极耳20211，进一步加快了焊接速度。
进一步地，凸起1012的另一端通过超声波焊接固定于保护板201的内侧表面或嵌入保护板201内。例如图2所示，凸起1012的上端通过超声波焊接与保护板201固定连接，且凸起1012的上端与保护板201的下侧表面相连。这样，进一步提高了极耳20211与凸起1012的连接强度，避免极耳20211与凸起1012发生脱离，使得集流体组件200的结构更稳固，保证了集流体组件200的生产良品率，提高了电池单体1000的良品率，降低了电池包的危险性。
可选地，凸起1012的上端还可以嵌入保护板201内与保护板201相连。
在本发明的另一个实施例中，保护板201上设有凸起1012，且设在保护板201的凸起1012通过高频振动刺穿多层极耳20211后与连接板101相连。参照图2所示，凸起1012的上端与保护板201相连，凸起1012在超声波焊接的高频振动下刺穿多层极耳20211，并且凸起1012的下端与连接板101相连，凸起1012与多层极耳20211为电连接。由此，焊接时保护板201在自身重力的作用下，凸起1012更容易刺穿多层极耳20211，加快了焊接速度。
在本发明的一些实施例中，集流体组件200包括多个凸起1012，多个凸起1012呈矩阵式布置。具体 而言，多个凸起1012在连接板101的其中一侧表面呈矩阵式布置，阵列排布的多个凸起1012提高了极耳20211与连接板101的连接强度，避免了在运输或者使用过程中极耳20211与连接板101相互脱离，提升了电池单体1000的良品率，增加了凸起1012与每层极耳20211之间的接触面积，增大了过流面积，散热均衡，电池包不易发生故障，降低了使用者的危险系数，提高了使用者的使用感受。
在本发明的一些实施例中，多个凸起1012在高频振动的振动方向上排列的密集程度大于除高频振动的振动方向外的其他方向的密集程度。也就是说，多个凸起1012在超声波振动方向上排列的密集程度大于其他方向的密集程度，多个凸起1012朝向背离连接板101的方向上凸出，多个凸起1012在超声波振动方向上排列的密集程度最大，多个凸起1012在除了超声波振动方向外的其他方向上的密集程度小于多个凸起1012在超声波振动方向上的密集程度。
在本发明的一些实施例中，多个凸起1012沿高频振动的振动方向延伸且在垂直于高频振动的振动方向间隔布置。参照图3所示，多个凸起1012在连接板101的上表面沿超声波的振动方向延伸，并且在垂直于超声波振动方向的方向上间隔布置，凸起1012形成为长条形，增大了极耳20211与凸起1012之间的接触面积，避免了极耳20211与凸起1012焊接不牢固，提高了极耳20211与连接板101之间的连接强度。
在一些实施例中，集流体组件200包括极片2021，极片2021包括多个极耳20211，多个极耳20211层叠设置，极耳20211包括：支撑绝缘层202113和分别覆盖在支撑绝缘层202113厚度方向两侧表面的第一导电层202111和第二导电层202112。参照图31所示，支撑绝缘层202113位于第一导电层202111和第二导电层202112之间，第一导电层202111和第二导电层202112分别覆盖在支撑绝缘层202113的上层表面和下层表面上。具体地，支撑绝缘层202113可为高分子层，由于高分子抗压强度较低，在利用超声波焊接时，超声波无法传导到底部的多层极耳20211上，在没有凸起的状态下焊接时摩擦力不够，导致虚焊而引起焊接不可靠的现象。在本发明的实施例中，由于加入了多个凸起1012，可以增加焊接时摩擦力，改善虚焊而导致焊接不可靠的现象。
电池单体1000可包括至少两个极片2021，一个为正极片，另一个为负极片。层叠设置的多个极耳20211的形成方式可以是将一个极片板材卷绕并使极片板材上的多个极耳20211层叠设置，也可以是利用多个极片板材层叠设置并使每个极片板材上的极耳20211对齐，而最后形成层叠设置的多个极耳20211。多个极耳20211可以是两个极耳20211，或多于两个的极耳20211。
下面将参考图1-图31描述根据本发明一个具体实施例的集流体组件200。
参照图16，凸起1012形成为长条形，集流体组件200具有集流体202和导电连接组件100，连接板101的上表面设有多个凸起1012，并且多个凸起1012在连接板101的上表面沿超声波振动方向延伸，连接板101的厚度为0.8mm，凸起1012的高度为0.6mm，凸起1012的长度L为13mm，凸起1012的宽度d为0.6mm，相邻两个凸起1012的间距L2为2.4mm，凸起1012在连接板101的上表面沿直线延伸，连接板101与多个凸起1012一体成型，极耳20211具有三层，从上向下分别是：第一导电层202111、第二导电层202112和支撑绝缘层202113，保护板201设在多层极耳20211的上方，凸起1012的上端与保护板201相连，超声波的振动频率在15KHz-40KHz范围内，振幅在5um到100um范围内，超声波的焊接压力不小于20N，焊接时间不小于30ms。
下面参考图1-图31描述根据本发明第三方面实施例的集流体组件200。
如图1-图31所示，根据本发明第三方面实施例的集流体组件200，包括：集流体202和导电连接组件100。
具体地，集流体组件200包括：集流体202和导电连接组件100，集流体202包括多层极耳20211，多层极耳20211在极耳20211的厚度方向层叠布置，导电连接组件100包括保护板201和连接板101，保护板201设在多层极耳20211在厚度方向的其中一侧，连接板101设在多层极耳20211在厚度方向的另一侧，其中，连接板101和保护板201中的至少一个上设有凸起1012，凸起1012包括在高度方向相连的连接段10121和穿刺段10122，连接段10121的一端与连接板101或保护板201相连，穿刺段10122连接在连接段10121的另一端，穿刺段10122构造成适于刺穿多层极耳20211，凸起1012与多层极耳20211电连接。在一个实施例中，连接板101上设有凸起1012。在一个实施例中，保护板201上设有凸起1012。 在一个实施例中，连接板101和保护板201上均设有凸起1012。
也就是说，多层极耳20211在极耳20211的厚度方向层叠布置，保护板201设在多层极耳20211在厚度方向的其中一侧，连接板101设在多层极耳20211在厚度方向的另一侧，凸起1012的一端与连接板101相连，凸起1012穿过多层极耳20211并与多层极耳20211电连接，凸起1012的另一端位于保护板201的外侧表面的内侧，凸起1012可以形成于连接板101上，凸起1012也可以形成于保护板201上，凸起1012与多层极耳20211电连接。
凸起1012包括两部分：连接段10121和穿刺段10122，当凸起1012形成于连接板101上时，连接段10121的一端与连接板101相连，连接段10121的另一端与穿刺段10122相连，当凸起1012形成于保护板201上时，连接段10121的一端与保护板201相连，连接段10121的另一端与穿刺段10122相连。穿刺段10122形成有穿刺端，穿刺端用于刺穿多层极耳20211。
参照图2所示，在上下方向上，多层极耳20211上下层叠设置，保护板201位于多层极耳20211的上侧，连接板101位于多层极耳20211的下侧，凸起1012与极耳20211之间为电连接。当凸起1012形成于连接板101上时，凸起1012的上端位于保护板201的下侧表面内，凸起1012包括两部分：连接段10121和穿刺段10122，凸起1012的下部为连接段10121，凸起1012的上部为穿刺段10122，连接段10121与连接板101相连，穿刺段10122连接在连接段10121的上端，当凸起1012形成于保护板201上时，凸起1012的下端位于连接板101的上侧表面内，凸起1012的上部为连接段10121，凸起1012的下部为穿刺段10122，连接段10121与保护板201相连，穿刺段10122连接在连接段10121的下端。
根据本发明实施例的集流体组件200，通过将具有穿刺段10122的凸起1012设置于集流体组件200上，穿刺端易于刺穿多层极耳20211，焊接能量易于穿透连接板101和多层极耳20211，降低了极耳20211的焊接难度，简化了工人的焊接过程，减少了制作工时，降低了人工成本，延长了集流体组件200的使用寿命。
在本发明的一些实施例中，连接段10121的截面面积相同，连接段10121与多层极耳20211电连接。参照图5所示，在上下方向上，连接段10121的截面面积相同，凸起1012的穿刺段10122用于刺穿多层极耳20211，凸起1012的连接段10121用于连接多层极耳20211，这样，焊接能量易于穿透连接板101和极耳20211，降低了极耳20211与连接板101的焊接难度，减少了制作工时，提高了极耳20211与连接板101之间的连接强度，连接稳固，保证了凸起1012的刺穿效果的同时，提升连接强度。
在本发明的一些实施例中，穿刺段10122形成为圆锥体形状或圆台形形状。也就是说，穿刺段10122可以为圆锥体形状，穿刺段10122也可以为圆台形状。
当穿刺段10122形成为圆锥体凸起1012，圆锥体的锥顶角度大于5°且小于150°，这样更有利于均衡凸起1012与极耳20211之间连接强度和焊接难度，避免为了保证凸起1012与极耳20211之间的连接强度忽视焊接难度，或者为了降低焊接难度忽视凸起1012与极耳20211之间的连接强度，从而在保证了凸起1012的刺穿效果的同时，提升连接强度。
例如，圆锥体的锥顶角度可以为：5°、10°、15°、20°、25°、30°、35°、40°、45°、50°、55°、60°、65°、70°、75°、80°、85°、90°、95°、100°、105°、110°、115°、120°、125°、130°、135°、140°、145°、150°等等。
当穿刺段10122形成为圆台形凸起1012，穿刺段10122的顶面半径与底面半径之间的比值不大于0.6。也就是说，穿刺段10122的顶面与穿刺段10122的周面具有一定角度，且穿刺段10122的顶面面积小于穿刺段10122的底面的面积。由此，凸起1012的顶面易于刺穿多层极耳20211，保证了凸起1012的刺穿效果，减少了凸起1012在焊接过程中的融化，提升了电池单体1000的可靠性。
例如，穿刺段10122的顶面半径与底面半径之间的比值可以为：0.6、0.55、0.5、0.45、0.4、0.35、0.3、0.25、0.2、0.15、0.1等等。
在一些实施例中，穿刺段10122的顶面半径不大于1.5mm，穿刺段10122的底面半径不大于2.5mm。
在本发明的一些实施例中，凸起1012在连接板101或保护板201的表面沿直线和/或曲线延伸，穿刺段10122垂直于凸起1012延伸方向的截面形成为三角形或梯形。也就是说，凸起1012可以在连接板101的表面沿直线延伸，凸起1012也可以在连接板101的表面沿曲线延伸，凸起1012也可以在保护板201 的表面沿曲线延伸，凸起1012还可以在保护板201的表面沿直线延伸，凸起1012在连接板101的表面上还可以是先沿直线延伸再沿曲线延伸，或者先沿曲线延伸再沿直线延伸，又或者凸起1012在保护板201的表面上还可以是先沿直线延伸再沿曲线延伸，或者先沿曲线延伸再沿直线延伸。由此，满足了不同的复合集流体202的焊接需求，扩展了连接板101的使用范围。
参照图29所示，凸起1012在连接板101的上表面沿曲线延伸，凸起1012形成为环形，在凸起1012的上部形成有四个凹槽，四个凹槽在凸起1012的上部均匀间隔布置，且四个凹槽在竖直方向上由凸起1012的上端面向下凹陷，增加了凸起1012与每层极耳20211之间的接触面积，增大了过流面积，提高了连接强度。
当穿刺段10122垂直于延伸方向的截面形成为三角形，在截面内，穿刺端的角度不大于120°。也就是说，凸起1012可以为棱柱体。截面为三角形的凸起1012更易于刺穿集流体202的多层极耳20211，凸起1012的刺穿效果能够得到保证，且穿刺端的角度不大于120°，能够进一步保证凸起1012的刺穿效果，进一步降低极耳20211与连接板101的焊接难度。
例如，穿刺段10122垂直于延伸方向的截面内，穿刺端的角度可以为：5°、10°、15°、20°、25°、30°、35°、40°、45°、50°、55°、60°、65°、70°、75°、80°、85°、90°、95°、100°、105°、110°、115°、120°等等。
在本发明的另一些实施例中，在凸起1012延伸方向上的截面形成为三角形，在截面内，穿刺端的角度不大于120°。也就是说，凸起1012可以棱锥体，凸起1012也可以为圆锥体。
例如，在穿刺段10122延伸方向的截面内，穿刺端的角度可以为：5°、10°、15°、20°、25°、30°、35°、40°、45°、50°、55°、60°、65°、70°、75°、80°、85°、90°、95°、100°、105°、110°、115°、120°等等。
当穿刺段10122垂直于延伸方向的截面形成为梯形，截面的上底与下底的比值不大于0.6。也就是说，穿刺段10122也可以为棱台，穿刺段10122也可以为棱柱，穿刺段10122还可以为圆台，凸起1012的下底与连接板101相连，凸起1012的上底小于凸起1012的下底，凸起1012的刺穿效果能够得到保证，且截面的上底与下底的比值不大于0.6，能够进一步保证凸起1012的刺穿效果，进一步降低极耳20211与连接板101的焊接难度。
例如，凸起1012的截面的上底与下底的比值可以为：0.6、0.55、0.5、0.45、0.4、0.35、0.3、0.25、0.2、0.15、0.1等等。
在一个实施例中，凸起1012的截面的上底不大于3mm，凸起1012的截面的下底不大于5mm。例如，凸起1012的截面的上底可以为：0.1mm、0.2mm、0.4mm、0.6mm、0.8mm、1.0mm、1.2mm、1.4mm、1.6mm、1.8mm、2.0mm、2.2mm、2.4mm、2.6mm、2.8mm、3.0mm等等；凸起1012的截面的下底可以为：0.1mm、0.2mm、0.4mm、0.6mm、0.8mm、1.0mm、1.2mm、1.4mm、1.6mm、1.8mm、2.0mm、2.2mm、2.4mm、2.6mm、2.8mm、3.0mm、3.2mm、3.4mm、3.6mm、3.8mm、4.0mm、4.2mm、4.4mm、4.6mm、4.8mm、5.0mm等等。
优选地，多个凸起1012通过超声波焊接与多层极耳20211相连。
在本发明的一些实施例中，在凸起1012的高度方向上，穿刺段10122的截面面积逐渐减小，且穿刺段10122的顶角不大于120°。参照图4和图5所示，在凸起1012的上下方向上，穿刺段10122的截面面积在从下往上的方向上逐渐减小，穿刺段10122底面的截面面积最大，穿刺段10122顶部的截面面积最小，凸起1012更容易刺穿多层极耳20211，降低了极耳20211与连接板101的焊接难度，减少了极耳20211与连接板101的焊接时长，提高了生产效率。
例如，穿刺段10122顶角的角度可以为：5°、10°、15°、20°、25°、30°、35°、40°、45°、50°、55°、60°、65°、70°、75°、80°、85°、90°、95°、100°、105°、110°、115°、120°等等。
进一步地，在凸起1012的高度方向上，穿刺段10122的高度不大于2mm。例如，穿刺段10122的高度可以为：2mm、1.8mm、1.6mm、1.4mm、1.2mm、1mm、0.8mm、0.6mm、0.4mm、0.2mm等等。由此，保证了凸起1012的刺穿效果，降低了极耳20211与连接板101的焊接难度，减少了制作工时，提高了焊接效率。
更进一步地，在凸起1012的高度方向上，连接段10121的高度不大于3mm。连接段10121的高度可以为：3mm、2.8mm、2.6mm、2.4mm、2.2mm、2mm、1.8mm、1.6mm、1.4mm、1.2mm、1mm、0.8mm、0.6mm、0.4mm、0.2mm等等。由此，提高了极耳20211与连接板101之间的连接强度，极耳20211与连接板101不易发生脱离，提高了良品率。
在本发明的一些实施例中，连接段10121与穿刺段10122平滑过渡。由于焊接过程中，极耳20211与凸起1012产生摩擦，连接段10121与穿刺段10122平滑过渡的凸起1012不易损伤极耳20211，延长了极耳20211的使用寿命，保证了电池单体1000的良品率，提高了电池包的安全可靠性。
下面将参考图1-图31描述根据本发明一个具体实施例的集流体组件200。
参照图16，凸起1012形成为长条形，集流体组件200具有集流体202和导电连接组件100，连接板101的上表面设有多个凸起1012，并且多个凸起1012在连接板101的上表面沿超声波振动方向延伸，连接板101的厚度为0.8mm，凸起1012的高度为0.6mm，相邻两个凸起1012的间距L2为2.4mm，凸起1012的连接段10121的高度为0.4mm，凸起1012的穿刺段10122的高度为0.2mm，凸起1012的长度L为13mm，凸起1012的宽度d为0.6mm，穿刺段10122的顶角的角度为67°，连接段10121在上下方向上的截面积相同，穿刺段10122在从下往上的方向上截面积逐渐减小，凸起1012在连接板101的上表面沿直线延伸，连接板101与多个凸起1012一体成型，极耳20211具有三层，从上向下分别是：第一导电层202111、第二导电层202112和支撑绝缘层202113，保护板201设在多层极耳20211的上方，凸起1012的上端与保护板201相连。
下面参考图1-图35描述根据本发明第四方面实施例的集流体组件200。
如图1-图35所示，根据本发明第四方面实施例的集流体组件200，包括：多层极耳20211、保护板201和连接板101。
具体地，多层极耳20211在极耳20211的厚度方向层叠布置，凸起1012包括第一凸起31和第二凸起32，保护板201上设有第一凸起31(参图34)，保护板201设在多层极耳20211在厚度方向的其中一侧，第一凸起31穿过多层极耳20211并与多层极耳20211电连接，连接板101上设有第二凸起32(参图32)，连接板101设在多层极耳20211在厚度方向的另一侧，第二凸起32穿过多层极耳20211并与多层极耳20211电连接。
也就是说，第一凸起31位于保护板201上，第二凸起32位于连接板101上，第一凸起31和第二凸起32均刺穿多层极耳20211并与多层极耳20211之间电连接，第一凸起31刺穿多层极耳20211后与连接板101相连，第二凸起32刺穿多层极耳20211与保护板201相连，保护板201和连接板101分别设在多层极耳20211在厚度方向上的两侧。
根据本发明实施例的集流体组件200，通过在保护板201和连接板101上同时设置凸起1012，进一步提高了极耳20211与凸起1012之间的连接强度，使得连接稳固，保证了凸起1012的刺穿效果，增加了凸起1012与极耳20211之间的接触面积，稳定了导电连接的可靠性，降低了故障率，保证了电池单体1000的良品率，也保证了电池包的使用安全性，避免了事故的发生。
在本发明的一些实施例中，第一凸起31包括多个，多个第一凸起31在保护板201所在平面内间隔设置，第二凸起32包括多个，多个第二凸起32在连接板101所在平面内间隔设置。也就是说，多个第一凸起31间隔布置在保护板201朝向连接板101的一侧表面上，多个第二凸起32间隔布置在连接板101朝向保护板201的一侧表面上，在保护板201和连接板101上分别设置第一凸起31和第二凸起32，保证了极耳20211与凸起1012之间的连接稳定性。
进一步地，第一凸起31设于保护板201上，且第一凸起31穿过多层极耳20211后与连接板101相连，第一凸起31可以与保护板201一体成型，第二凸起32设于连接板101上，且第二凸起32穿过多层极耳20211后与保护板201相连，第二凸起32可以与连接板101一体成型，这样，减少了集流体组件200的零部件数量，提高了集流体组件200的整体的连接强度，提升了凸起1012与极耳20211的连接稳定性，降低了集流体组件200的不良品率，延长了集流体组件200的使用寿命。
可选地，第一凸起31和第二凸起32分别通过焊接、粘接、插接或卡接于保护板201和连接板101上。
由于超声波焊接，焊接速度快，焊接强度高、密封性好，取代了传统的焊接/粘接工艺，成本低廉，清洁无污染且不会损伤软连接片和极耳20211，焊接过程稳定，焊接后导电性好，电阻系数极低或近乎零，焊接时间短，不需任何助焊剂、气体、焊料，焊接过程中不产生火花，环保安全。进一步优选地，第一凸起31和第二凸起32分别通过超声波焊接于保护板201和连接板101上，超声波的振动频率在15KHz-40KHz范围内，振幅在5um到100um范围内，超声波的焊接压力不小于20N，焊接时间不小于30ms。
在本发明的一些实施例中，在垂直于极耳20211厚度方向的平面内，至少一组相邻的两个第一凸起31之间设有一个第二凸起32，或，至少一组相邻的两个第二凸起32之间设有一个第一凸起31。也就是说，在垂直于极耳20211厚度方向的平面内，可以是一组两个第一凸起31之间布置一个第二凸起32，也可以是一组两个第一凸起31之间布置两个第二凸起32，还可以是一组两个第二凸起32之间布置一个第一凸起31，还可以是一组两个第二凸起32之间布置两个第一凸起31，等等，在另一些实施例中还可以是多组。
在本发明的一些实施例中，多个第一凸起31和多个第二凸起32在垂直于极耳20211厚度方向的平面内交错布置。例如，可以是一个第一凸起31和一个第二凸起32交错布置，也可以是两个第一凸起31和两个第二凸起32交错布置，还可以是三个第一凸起31和三个第二凸起32交错布置，等等具有一定的规律性，能够保证极耳20211与凸起1012之间连接稳定，提高了导电连接的可靠性，降低了电池单体1000的故障率。
在本发明的一些实施例中，第一凸起31穿过多层极耳20211后与连接板101连接，第二凸起32穿过多层极耳20211后与保护板201连接。也就是说，第一凸起31的上端与保护板201相连，第一凸起31的下端与连接板101相连，第二凸起32的上端与保护板201相连，第二凸起32的下端与连接板101相连。这样，第一凸起31和第二凸起32同时分别与连接板101和保护板201相连，保证了集流体组件200连接稳固，提高了电池单体1000的良品率，经济可靠。
在本发明的一些实施例中，连接板101在厚度方向上背离极耳20211的表面为第一表面，保护板201在厚度方向上背离极耳20211的表面为第二表面，第一凸起31在极耳20211的厚度方向上的两端和第二凸起32在极耳20211厚度方向的两端均位于第一表面的内侧以及第二表面的内侧。简言之，第一凸起31和第二凸起32均位于连接板101和保护板201之间。
在本发明的一些实施例中，第一凸起31和第二凸起32中的任一个均包括：在高度方向相连的连接段10121和穿刺段10122，连接段10121的一端与连接板101或保护板201相连，穿刺段10122连接在连接段10121的另一端，穿刺段10122构造成适于刺穿多层极耳20211。也就是说，可以是第一凸起31包括在高度方向相连的连接段10121和穿刺段10122，也可以是第二凸起32包括在高度方向相连的连接段10121和穿刺段10122，还可以是第一凸起31和第二凸起32均包括在高度方向相连的连接段10121和穿刺段10122。
当第一凸起31包括在高度方向相连的连接段10121和穿刺段10122时，第一凸起31的下端位于连接板101的上侧表面内，第一凸起31的上部为连接段10121，第一凸起31的下部为穿刺段10122，连接段10121与保护板201相连，穿刺段10122连接在连接段10121的下端，穿刺段10122形成有穿刺端，穿刺端用于刺穿多层极耳20211。
当第二凸起32包括在高度方向相连的连接段10121和穿刺段10122时，第二凸起32的上端位于保护板201的下侧表面内，第二凸起32的下部为连接段10121，第二凸起32的上部为穿刺段10122，连接段10121与连接板101相连，穿刺段10122连接在连接段10121的上端，穿刺段10122形成有穿刺端，穿刺端用于刺穿多层极耳20211。
下面参照图1-图35详细描述根据本发明一个具体实施例的集流体组件200。
具体地，第一凸起31和第二凸起32均形成为长条形，集流体组件200具有多层极耳20211、保护板201和连接板101，保护板201上设有第一凸起31，连接板101上设有第二凸起32，连接板101的厚度为0.8mm，第二凸起32的长度L为13mm，第二凸起32的宽度d为0.6mm，第二凸起32的高度为0.6mm，凸起1012的连接段10121第二的高度为0.4mm，第二凸起32的穿刺段10122的高度为0.2mm，穿刺段 10122的顶角的角度为67°，连接段10121在上下方向上的截面积相同，穿刺段10122在从下往上的方向上截面积逐渐减小，凸起1012在连接板101的上表面沿直线延伸，连接板101与多个第二凸起32一体成型，保护板201与多个第一凸起31一体成型，极耳20211具有三层，从上向下分别是：第一导电层202111、第二导电层202112和支撑绝缘层202113，保护板201设在多层极耳20211的上方，第一凸起31和第二凸起32分别与连接板101和保护板201相连。
综上所述，根据本发明的集流体组件200，包括：
多层极耳20211，多层极耳20211在极耳20211的厚度方向层叠布置；
保护板201，保护板201设在多层极耳20211在厚度方向的其中一侧；
连接板101，连接板101设在多层极耳20211在厚度方向的另一侧；
凸起1012，设在连接板101和保护板201之间，凸起1012穿过多层极耳20211并与多层极耳20211电连接。
根据本发明的集流体组件200，通过设置凸起1012，降低极耳20211的焊接难度，简化了工人的焊接过程，减少了制作工时，降低了人工成本，提高了极耳20211与连接板101之间的连接强度，连接稳固，设置保护板201，保护极耳20211在焊接时免于受损，通过设置凸起1012以及保护板201，既保证了极耳20211焊接强度，又保护极耳20211免于受损，保证极耳20211的过流能力。
根据本发明第五方面实施例的电池单体1000，包括本发明上述第一方面至第四方面任一实施例的集流体组件200。
根据本发明实施例的电池单体1000，通过将设置上述实施例的集流体组件200应用至电池单体1000，从而降低了电池单体1000的装配难度，减少了电池单体1000的制作工时，降低了人工成本，保证了电池单体1000的可靠性。
根据本发明第六方面实施例的电池包，包括根据本发明上述第五方面实施例的电池单体1000。
根据本发明实施例的电池包，通过设置上述第二方面实施例的电池单体1000，从而提升了电池包的安全性能，保证了电池包的可靠性，避免了危险的发生。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本发明的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接，还可以是通信；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
尽管已经示出和描述了本发明的实施例，本领域的普通技术人员可以理解：在不脱离本发明的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由权利要求及其等同物限定。

Claims (40)

  1. 一种集流体组件，其特征在于，包括：
    多层极耳，多层所述极耳在所述极耳的厚度方向层叠布置；
    保护板，所述保护板设在所述多层极耳在厚度方向的其中一侧；
    连接板，所述连接板设在所述多层极耳在厚度方向的另一侧；
    凸起，设在所述连接板和所述保护板之间，所述凸起穿过多层所述极耳并与多层所述极耳电连接。
  2. 根据权利要求1所述的集流体组件，其特征在于，所述凸起的一端与所述连接板相连，所述凸起的另一端位于所述保护板的外侧表面的内侧。
  3. 根据权利要求2所述的集流体组件，其特征在于，所述凸起的所述另一端与所述保护板相连。
  4. 根据权利要求2或3所述的集流体组件，其特征在于，所述凸起的所述另一端固定于所述保护板的内侧表面。
  5. 根据权利要求1-4任一项所述的集流体组件，其特征在于，所述凸起设于所述连接板上，且所述凸起穿过多层所述极耳后与所述保护板相连。
  6. 根据权利要求1或2所述的集流体组件，其特征在于，所述凸起设于所述保护板上，且所述凸起穿过多层所述极耳后与所述连接板相连。
  7. 根据权利要求1-6任一项所述的集流体组件，其特征在于，在所述极耳的厚度方向上，所述凸起的高度在0.1mm到3mm范围。
  8. 根据权利要求1-7任一项所述的集流体组件，其特征在于，所述集流体组件包括多个所述凸起，多个所述凸起呈矩阵式布置。
  9. 根据权利要求1-8任一项所述的集流体组件，其特征在于，在垂直于所述极耳厚度方向的平面内，所述凸起沿直线和/或曲线延伸。
  10. 根据权利要求1-9任一项所述的集流体组件，其特征在于，多个所述凸起通过超声波焊接与多层所述极耳相连，且多个所述凸起在超声波振动方向上排列的密集程度大于其他方向的密集程度。
  11. 根据权利要求1-10任一项所述的集流体组件，其特征在于，所述极耳包括：支撑绝缘层和分别覆盖在所述支撑绝缘层厚度方向两侧表面的第一导电层和第二导电层。
  12. 根据权利要求1所述的集流体组件，其特征在于，所述集流体组件包括：
    导电连接组件，所述导电连接组件包括所述保护板和所述连接板；
    其中，所述连接板和所述保护板中的至少一个上设有所述凸起，所述凸起通过高频振动刺穿多层所述极耳并与多层所述极耳电连接，所述高频振动的频率在15KHz-40KHz范围。
  13. 根据权利要求12所述的集流体组件，其特征在于，所述高频振动的振幅在5um到100um范围内。
  14. 根据权利要求12或13所述的集流体组件，其特征在于，所述凸起在所述连接板和/或所述保护板的表面延伸，所述高频振动的振动方向平行于所述凸起的延伸方向。
  15. 根据权利要求12-14任一项所述的集流体组件，其特征在于，所述高频振动为超声波焊接产生的振动。
  16. 根据权利要求12-15任一项所述的集流体组件，其特征在于，所述连接板上设有所述凸起，所述凸起的一端与所述连接板相连，设在所述连接板上的所述凸起通过高频振动刺穿多层所述极耳并与多层所述极耳电连接，所述凸起的另一端与所述保护板相连。
  17. 根据权利要求16所述的集流体组件，其特征在于，所述凸起的所述另一端通过超声波焊接固定于所述保护板的内侧表面或嵌入所述保护板内。
  18. 根据权利要求12-15任一项所述的集流体组件，其特征在于，所述保护板上设有所述凸起，且设在所述保护板的所述凸起通过高频振动刺穿多层所述极耳后与所述连接板相连。
  19. 根据权利要求12-18任一项所述的集流体组件，其特征在于，所述连接板和所述保护板中的至少一个上设有多个所述凸起，多个所述凸起呈矩阵式布置。
  20. 根据权利要求19所述的集流体组件，其特征在于，多个所述凸起在所述高频振动的振动方向上排列的密集程度大于除所述高频振动的振动方向外的其他方向的密集程度。
  21. 根据权利要求19所述的集流体组件，其特征在于，多个所述凸起沿所述高频振动的振动方向延伸 且在垂直于所述高频振动的振动方向间隔布置。
  22. 根据权利要求1所述的集流体组件，其特征在于，所述集流体组件包括：
    导电连接组件，所述导电连接组件包括所述保护板和所述连接板；
    其中，所述连接板和所述保护板中的至少一个上设有所述凸起，所述凸起包括在高度方向相连的连接段和穿刺段，所述连接段的一端与所述连接板或所述保护板相连，所述穿刺段连接在所述连接段的另一端，所述穿刺段构造成适于刺穿所述多层极耳，所述凸起与多层所述极耳电连接。
  23. 根据权利要求22所述的集流体组件，其特征在于，所述连接段的截面面积相同，所述连接段与多层所述极耳电连接。
  24. 根据权利要求22或23所述的集流体组件，其特征在于，所述穿刺段形成为圆锥体形状或圆台形形状。
  25. 根据权利要求22-24任一项所述的集流体组件，其特征在于，所述凸起在所述连接板和/或所述保护板的表面沿直线和/或曲线延伸，所述穿刺段垂直于所述凸起延伸方向的截面形成为三角形或梯形。
  26. 根据权利要求22-25任一项所述的集流体组件，其特征在于，在所述凸起的高度方向上，所述穿刺段的截面面积逐渐减小，且所述穿刺段的顶角不大于120°。
  27. 根据权利要求22-26任一项所述的集流体组件，其特征在于，在所述凸起的高度方向上，所述穿刺段的高度不大于2mm。
  28. 根据权利要求22-27任一项所述的集流体组件，其特征在于，所述连接段与所述穿刺段平滑过渡。
  29. 根据权利要求22-28任一项所述的集流体组件，其特征在于，所述连接板和所述保护板中的至少一个上设有多个所述凸起，多个所述凸起呈矩阵式布置。
  30. 根据权利要求1所述的集流体组件，其特征在于，所述凸起包括第一凸起和第二凸起；
    所述保护板上的所述第一凸起，所述第一凸起穿过多层所述极耳并与多层所述极耳电连接；
    所述连接板上的所述第二凸起，所述第二凸起穿过多层所述极耳并与多层所述极耳电连接。
  31. 根据权利要求30所述的集流体组件，其特征在于，所述保护板设有多个所述第一凸起，多个所述第一凸起在所述保护板所在平面内间隔设置，所述连接板设有多个所述第二凸起，多个所述第二凸起在所述连接板所在平面内间隔设置。
  32. 根据权利要求31所述的集流体组件，其特征在于，在垂直于所述极耳厚度方向的平面内，至少一组相邻的两个所述第一凸起之间设有一个第二凸起，或，至少一组相邻的两个第二凸起之间设有一个第一凸起。
  33. 根据权利要求32所述的集流体组件，其特征在于，多个所述第一凸起和多个所述第二凸起在垂直于所述极耳厚度方向的平面内交错布置。
  34. 根据权利要求30-33任一项所述的集流体组件，其特征在于，所述第一凸起穿过多层所述极耳后与所述连接板连接，所述第二凸起穿过多层所述极耳后与所述保护板连接。
  35. 根据权利要求34所述的集流体组件，其特征在于，所述连接板在厚度方向上背离所述极耳的表面为第一表面，所述保护板在厚度方向上背离所述极耳的表面为第二表面，所述第一凸起在所述极耳的厚度方向上的两端和所述第二凸起在极耳厚度方向的两端均位于所述第一表面的内侧以及所述第二表面的内侧。
  36. 根据权利要求30-35任一项所述的集流体组件，其特征在于，所述第一凸起和所述第二凸起中的任一个均包括：在高度方向相连的连接段和穿刺段，所述连接段的一端与所述连接板或保护板相连，所述穿刺段连接在所述连接段的另一端，所述穿刺段构造成适于刺穿所述多层极耳。
  37. 根据权利要求36所述的集流体组件，其特征在于，所述连接段的截面面积相同，所述连接段与多层所述极耳电连接。
  38. 根据权利要求1-37任一项所述的集流体组件，其特征在于，所述集流体组件包括极片，所述极片包括集流体和多个所述极耳，多个所述极耳层叠设置；所述极片包括：支撑绝缘层和分别覆盖在所述支撑绝缘层厚度方向两侧表面的第一导电层和第二导电层。
  39. 一种电池单体，其特征在于，包括根据权利要求1-38任一项所述的集流体组件。
  40. 一种电池包，其特征在于，包括根据权利要求39所述的电池单体。
PCT/CN2022/105695 2021-07-14 2022-07-14 集流体组件、电池单体和电池包 WO2023284825A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22841458.7A EP4340116A1 (en) 2021-07-14 2022-07-14 Current collector assembly, battery cell, and battery pack
US18/399,740 US20240128602A1 (en) 2021-07-14 2023-12-29 Current collector assembly, battery cell, and battery pack

Applications Claiming Priority (16)

Application Number Priority Date Filing Date Title
CN202121604477.2 2021-07-14
CN202121604602.XU CN217691556U (zh) 2021-07-14 2021-07-14 集流体组件、电池单体和电池包
CN202110798340.3A CN113422170A (zh) 2021-07-14 2021-07-14 集流体组件、电池单体和电池包
CN202110798225.6A CN113422169A (zh) 2021-07-14 2021-07-14 集流体组件、电池单体和电池包
CN202121603148.6 2021-07-14
CN202110798222.2A CN113422168A (zh) 2021-07-14 2021-07-14 集流体组件、电池单体和电池包
CN202121604710.7U CN217691564U (zh) 2021-07-14 2021-07-14 集流体组件、电池单体和电池包
CN202121604602.X 2021-07-14
CN202121604477.2U CN217691563U (zh) 2021-07-14 2021-07-14 集流体组件、电池单体和电池包
CN202110798340.3 2021-07-14
CN202110798108.XA CN113422165A (zh) 2021-07-14 2021-07-14 集流体组件、电池单体和电池包
CN202121603148.6U CN217691560U (zh) 2021-07-14 2021-07-14 集流体组件、电池单体和电池包
CN202110798222.2 2021-07-14
CN202110798225.6 2021-07-14
CN202121604710.7 2021-07-14
CN202110798108.X 2021-07-14

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/399,740 Continuation US20240128602A1 (en) 2021-07-14 2023-12-29 Current collector assembly, battery cell, and battery pack

Publications (1)

Publication Number Publication Date
WO2023284825A1 true WO2023284825A1 (zh) 2023-01-19

Family

ID=84919050

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/105695 WO2023284825A1 (zh) 2021-07-14 2022-07-14 集流体组件、电池单体和电池包

Country Status (3)

Country Link
US (1) US20240128602A1 (zh)
EP (1) EP4340116A1 (zh)
WO (1) WO2023284825A1 (zh)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108695480A (zh) * 2017-03-30 2018-10-23 福特全球技术公司 用于电池单元的电互连部
CN110382212A (zh) * 2017-01-11 2019-10-25 多种材料焊接股份公司 将物体结合在一起
CN113422170A (zh) * 2021-07-14 2021-09-21 厦门海辰新能源科技有限公司 集流体组件、电池单体和电池包
CN113422169A (zh) * 2021-07-14 2021-09-21 厦门海辰新能源科技有限公司 集流体组件、电池单体和电池包
CN113422165A (zh) * 2021-07-14 2021-09-21 厦门海辰新能源科技有限公司 集流体组件、电池单体和电池包
CN113422168A (zh) * 2021-07-14 2021-09-21 厦门海辰新能源科技有限公司 集流体组件、电池单体和电池包

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110382212A (zh) * 2017-01-11 2019-10-25 多种材料焊接股份公司 将物体结合在一起
CN108695480A (zh) * 2017-03-30 2018-10-23 福特全球技术公司 用于电池单元的电互连部
CN113422170A (zh) * 2021-07-14 2021-09-21 厦门海辰新能源科技有限公司 集流体组件、电池单体和电池包
CN113422169A (zh) * 2021-07-14 2021-09-21 厦门海辰新能源科技有限公司 集流体组件、电池单体和电池包
CN113422165A (zh) * 2021-07-14 2021-09-21 厦门海辰新能源科技有限公司 集流体组件、电池单体和电池包
CN113422168A (zh) * 2021-07-14 2021-09-21 厦门海辰新能源科技有限公司 集流体组件、电池单体和电池包

Also Published As

Publication number Publication date
EP4340116A1 (en) 2024-03-20
US20240128602A1 (en) 2024-04-18

Similar Documents

Publication Publication Date Title
JP2010212241A (ja) ２次電池
JP5414476B2 (ja) ２次電池
CN112449733B (zh) 具有多层电池壳体的圆柱形二次电池及其制造方法
US20230014441A1 (en) Preparation method of current collector assembly, current collector assembly, battery cell, and battery pack
CN113422168A (zh) 集流体组件、电池单体和电池包
KR20080030698A (ko) 안전성이 향상된 이차전지의 제조방법
CN114614209A (zh) 电池
CN114614208A (zh) 电池
WO2023284825A1 (zh) 集流体组件、电池单体和电池包
CN113422165A (zh) 集流体组件、电池单体和电池包
CN113422169A (zh) 集流体组件、电池单体和电池包
CN217468709U (zh) 电池单体和电池包
CN113422166A (zh) 连接件、电池单体和电池包
WO2023284821A1 (zh) 连接件、电池单体和电池包
CN217691556U (zh) 集流体组件、电池单体和电池包
CN217691563U (zh) 集流体组件、电池单体和电池包
CN113422170A (zh) 集流体组件、电池单体和电池包
CN113422167A (zh) 连接件、电池单体和电池包
CN113422172A (zh) 连接件、电池单体和电池包
CN114566768A (zh) 一种极片、电化学装置以及电子设备
CN113422171A (zh) 连接件、电池单体和电池包
CN217691558U (zh) 连接件、电池单体和电池包
CN217691564U (zh) 集流体组件、电池单体和电池包
CN217691559U (zh) 连接件、电池单体和电池包
CN217691553U (zh) 集流体组件、电池单体和电池包

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22841458

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2022841458

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2022841458

Country of ref document: EP

Effective date: 20231212

NENP Non-entry into the national phase

Ref country code: DE