WO2019169546A1 - 卷绕式电芯 - Google Patents

卷绕式电芯 Download PDF

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Publication number
WO2019169546A1
WO2019169546A1 PCT/CN2018/078128 CN2018078128W WO2019169546A1 WO 2019169546 A1 WO2019169546 A1 WO 2019169546A1 CN 2018078128 W CN2018078128 W CN 2018078128W WO 2019169546 A1 WO2019169546 A1 WO 2019169546A1
Authority
WO
WIPO (PCT)
Prior art keywords
current collector
segment
wound
adhesive
material layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2018/078128
Other languages
English (en)
French (fr)
Inventor
江静
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningde Amperex Technology Ltd
Original Assignee
Ningde Amperex Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ningde Amperex Technology Ltd filed Critical Ningde Amperex Technology Ltd
Priority to EP18908778.6A priority Critical patent/EP3764452A4/en
Priority to PCT/CN2018/078128 priority patent/WO2019169546A1/zh
Priority to JP2020518486A priority patent/JP7208227B2/ja
Priority to KR1020207008850A priority patent/KR102519604B1/ko
Publication of WO2019169546A1 publication Critical patent/WO2019169546A1/zh
Priority to US16/829,988 priority patent/US11652212B2/en
Anticipated expiration legal-status Critical
Priority to US18/132,778 priority patent/US12176546B2/en
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • 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
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • 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
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/78—Shapes other than plane or cylindrical, e.g. helical
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H01M50/466—U-shaped, bag-shaped or folded
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/595—Tapes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to the field of battery technologies, and in particular, to a wound battery core.
  • lithium ion battery abuse is easy to fail especially in the case of a drop, and a safety accident occurs.
  • a double-sided adhesive or a hot melt adhesive is generally used to strengthen the bare cell and the package.
  • the method can reduce the moving collision of the bare cell, but this measure is easy to cause the tear of the aluminum foil to be closed, because there is an empty foil or a single-sided area in the outermost ring, the friction between the layers is weak, and the tear is easy to be displaced, further Cause a short circuit problem.
  • the present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a wound cell that can effectively avoid short circuits.
  • a wound cell according to the present invention includes: a first current collector and a second current collector, the winding end of the first current collector being at least half a turn beyond the trailing end of the second current collector.
  • the inventors of the present invention have found that after lengthening the length of the first current collector and causing the trailing end of the first current collector to exceed the end of the second current collector for at least half a turn, the following occurs: the outermost circumference of the wound cell For the first current collector, the secondary outer ring is the first current collector, and the outer outer ring is the second current collector, so the outermost and the outer outer rings of the wound cell are the first current collector, If the tail end of the first current collector is torn, the contact between the outermost ring and the outer outer ring of the first current collector does not occur, and the contact between the same pole is substantially.
  • the trailing end of the first current collector extends beyond the end of the second current collector by a half turn to one turn.
  • the trailing end of the first current collector abuts against the outer peripheral surface of the first current collector secondary outer ring.
  • the wound cell further includes: a separator, the separator being spaced between the first current collector and the second current collector, in a winding direction, A trailing end of the separator is between the trailing end of the first current collector and the trailing end of the second current collector.
  • the trailing end of the first current collector extends beyond the end of the separator at least half.
  • the wound cell includes: a first straight segment, The first bending section, the second straight section and the second bending section, the finishing end of the first current collector is located in the first straight section or the second straight section.
  • the trailing end of the first current collector and the trailing end of the second current collector are both located in the first straight section or the second straight section.
  • the trailing end of the first current collector is located in the first straight section or the second straight section
  • the finishing end of the second current collector is located in the first straight line a segment or the second straight segment, the end of the first current collector and the end of the second current collector are respectively located on opposite sides of the wound cell.
  • the first current collector includes: a first active material layer segment, a first empty foil segment, and a finishing segment sequentially connected, wherein the first empty foil segment surface is not provided with the first active material, a surface of the first active material layer is provided with a first active material layer, the finishing section is at least half a circle; and the second current collector comprises: a second active material layer segment and a second empty foil which are sequentially connected a second active material layer is disposed on a surface of the second active material layer segment, and a second active material layer is not disposed on the surface of the second empty foil segment; the wound cell includes an empty foil segment opposing region And a portion of the first empty foil segment and the second empty foil segment facing each other.
  • the first empty foil segments are from one half turn to one turn.
  • the first current collector includes: a first active material layer segment and a finishing portion sequentially connected, a surface of the first active material layer is provided with an active material layer, and the finishing portion is at least a half circle; the second current collector surface is provided with an active material layer, and the active material layer extends to the finishing end of the second current collector.
  • a region from the beginning end of the first current collector to the first time where the first current collector is bent is the first The initial section of a current collector; in the opposite direction of the winding, on the second current collector, the second collector end to the second current collector is bent first, and the outer circumference of the second current collector is straight. a segment; a projection of the first current collector and the outer circumference of the second current collector in a horizontal plane without overlapping regions.
  • the trailing end of the first current collector is bonded to the outer peripheral surface of the outermost circumference of the first current collector by an adhesive.
  • the adhesive is at least one of a single-sided adhesive, a double-sided adhesive, and a hot melt adhesive.
  • the adhesive is a double-sided tape or a hot melt adhesive, and the adhesive is also used to bond the package.
  • the adhesive is a single-sided adhesive
  • the wound-type battery is bonded with a double-sided tape or a hot-melt adhesive on the other side away from the end of the first current collector.
  • the double-sided tape or the hot melt adhesive is also used to bond the package.
  • the adhesive is also bent to extend away from the other side of the first current collector end.
  • the wound cell further includes: a first tab and a second tab, the first tab being electrically connected to the first current collector, the second tab Electrically connected to the second current collector, the projection of the first tab and the adhesive on the horizontal plane does not overlap or the projection of the second tab and the adhesive on the horizontal plane does not overlap.
  • the first current collector is a cathode current collector
  • the second current collector is an anode current collector
  • the first current collector body is made of aluminum
  • the second current collector body is made of copper.
  • the first current collector is an anode current collector
  • the second current collector is a cathode current collector
  • the first current collector body material is copper
  • the second current collector body material is aluminum
  • FIG. 1 is a schematic view of a wound cell according to a first embodiment of the present invention
  • Figure 2 is a schematic view of a wound cell according to a second embodiment of the present invention.
  • Figure 3 is a schematic view of a wound cell according to a third embodiment of the present invention.
  • Figure 4 is a schematic view of a wound cell according to a fourth embodiment of the present invention.
  • Figure 5 is a schematic view of a wound cell according to a fifth embodiment of the present invention.
  • Figure 6 is a schematic view of a wound cell according to a sixth embodiment of the present invention.
  • Figure 7 is a schematic view of a wound cell according to a seventh embodiment of the present invention.
  • Figure 8 is a schematic view of a wound cell according to an eighth embodiment of the present invention.
  • Figure 9 is a schematic view of a wound cell according to a ninth embodiment of the present invention.
  • Figure 10 is a perspective view of a first angle of a wound cell according to an embodiment of the present invention.
  • Figure 11 is a perspective view of a second angle of a wound cell in accordance with an embodiment of the present invention.
  • Figure 12 is a schematic illustration of a wound cell and package in accordance with an embodiment of the present invention.
  • a first current collector 1 a finishing end 1a of the first current collector; a starting end 1b of the first current collector;
  • first active material layer segment 11 a first active material layer segment 11; a first empty foil segment 12; a finishing segment 13; a starting segment 14;
  • a second current collector 2 a finishing end 2a of the second current collector; a starting end 2b of the second current collector; a second active material layer 21; a second empty foil section 22; an outer ring straight section 23;
  • Isolation film 3 active material layer 4; adhesive 5;
  • first and second may include one or more of the features, either explicitly or implicitly.
  • a plurality means two or more unless otherwise stated.
  • connection In the description of the present invention, it should be noted that the terms “installation”, “connected”, and “connected” are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or integrally connected; can be mechanical or electrical; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of the two components.
  • Connected, or integrally connected can be mechanical or electrical; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of the two components.
  • the specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.
  • wound cell 10 according to an embodiment of the present invention will be described in detail below with reference to Figs.
  • a wound cell 10 includes a first current collector 1 and a second current collector 2, and in the winding direction, the trailing end 1a of the first current collector 1 is exceeded.
  • the closing end 2a of the second current collector 2 is at least half a turn.
  • the winding direction of the wound cell 10 means that the point is along the first current collector 1, the second current collector 2 or the isolating film 3 from the inner side at a point on each of the winding type electric core diagrams as shown in FIGS.
  • the direction of the outer movement is the winding direction, and the winding direction may be two, that is, clockwise and counterclockwise winding, as shown in FIGS. 1 to 3 and 7, the winding direction of the wound core 10 is Clockwise, as shown in Figures 4-6, the winding direction of the wound cell 10 is counterclockwise.
  • One circle refers to calculation from a point on the wound cell 10 as a starting end, and one point in the winding direction to another point is defined as an end end, and the end end is at the beginning end and the center of the circle is in a On the straight line, the starting end is between the end and the center of the circle, and the half circle is half of the above one.
  • the wound core 10 includes: a first straight section p1, a first bending section w1, a second straight section p2, and a second bending section w2, as described in FIGS.
  • the first flat The straight segment p1 and the second straight segment p2 are portions of the wound core 10 that are parallel to the horizontal direction, and the first straight segment p1 is at the upper portion of the center of the wound cell 10, and the second straight segment p2 is a lower portion of the wound cell; the first bent portion w1 and the second bent portion w2 are portions of the wound core 10 that are parallel to the vertical direction, and the first bent portion w1 is in the wound battery On the left side of the center 10, the second winding section w2 is on the right side of the center of the wound cell 10.
  • the half turn generally includes a combination of any one of the straight segments and any one of the bent segments, for example, a combination of the first straight segment p1 and the first bent segment w1, and, for example, the first bent segment w1 and the second straight portion The combination of segment p2.
  • the first current collector 1 and the second current collector 2 are formed with a starting end and a closing end, and the starting end is generally located inside the wound cell 10, and the closing end is generally located. The outside of the wound cell 10.
  • the first current collector 1 may be a cathode current collector, the second current collector 2 is an anode current collector, the first current collector 1 is made of aluminum, and the second current collector 2 is made of copper.
  • the first current collector 1 is an anode current collector
  • the second current collector 2 is a cathode current collector
  • the first current collector 1 is made of copper
  • the second current collector 2 is made of aluminum.
  • the closing end of the conventional first current collector may also exceed the length of the closing end of the second current collector, but the length thereof is much smaller than the half length of the wound cell.
  • the end of the first current collector will be torn due to special circumstances, and if the inner layer is also torn after the tearing, the first current collector and the second current collector will contact and short-circuit, resulting in a problem.
  • the battery is less secure.
  • the packaging bag 20 and the battery core are bonded by glue, although the function of the fixed battery core is played to some extent, but the viscosity of the rubber will cause the first current collector 1 to some extent when the battery core is dropped.
  • the tear at the end of the end 1a Those skilled in the art will consider starting from the performance of the glue, but fail to achieve better results.
  • the development direction of the battery cell is small in size and large in capacity, and the growth of the first current collector 1 will cause an increase in the thickness of the wound cell 10, so those skilled in the art are avoiding the increase of the current collector. length.
  • the inventors of the present invention have found that after lengthening the length of the first current collector 1 and causing the trailing end 1a of the first current collector 1 to exceed the closing end 2a of the second current collector 2 by at least half a turn, the following occurs:
  • the outermost ring of the core 10 is the first current collector 1
  • the secondary outer ring is the first current collector 1
  • the outer outer ring is the second current collector 2, so the outermost circle and the second of the wound cell 10
  • the outer ring is the first current collector 1, so that even if the closing end 1a of the first current collector 1 is torn, the contact between the outermost ring and the secondary outer ring of the first current collector 1 does not occur, and the essence thereof For the contact between the same pole.
  • the wound cell 10 of the embodiment of the present invention by appropriately setting the length of the first current collector 1, even if the trailing end 1a of the first current collector 1 is torn, the outermost circumference of the first current collector 1 and There is also no short circuit in contact between the secondary outer rings.
  • the closing end 1a of the first current collector 1 exceeds the closing end 2a of the second current collector 2 by half a turn to one turn.
  • the closing end 1a of the first current collector 1 exceeds the ending end 2a of the second current collector 2 by three quarters, as shown in FIG. 3 and FIG.
  • the closing end 1a of the first current collector 1 is beyond the closing end 2a of the second current collector 2
  • the closing end 1a of the first current collector 1 exceeds the second current collector 2
  • the closing end 2a is half a circle.
  • the first current collector 1 and the second current collector 2 thus disposed are less in thickness increase, and the occurrence of a short circuit problem can be avoided.
  • the closing end 1a of the first current collector 1 abuts against the outer peripheral surface of the primary outer ring of the first current collector.
  • the outermost circumference and the outer outer circumference of the first current collector 1 are directly abutted, so that the overall structure of the wound core 10 can be made reliable, and the first current collector 1 and the second current collector can be effectively avoided.
  • the wound cell 10 further includes: a separator 3, which is spaced between the first current collector 1 and the second current collector 2, and is isolated along the winding direction.
  • the trailing end of the membrane 3 is located between the trailing end 1a of the first current collector 1 and the trailing end 2a of the second current collector 2. That is, in the winding direction, the trailing end of the separator 3 extends beyond the trailing end 2a of the second current collector 2, and the trailing end 1a of the first current collector 1 extends beyond the trailing end of the separator 3.
  • the separator 3 can effectively isolate the first current collector 1 and the second current collector 2 in the winding direction, so that the first current collector 1 and the second current collector 2 can be effectively prevented from contacting, and the occurrence of a short circuit phenomenon can be avoided.
  • the closing end 1a of the first current collector 1 is at least half a turn beyond the closing end of the separator 3.
  • the closing end 1a of the first current collector 1 exceeds the closing end half of the separator 3, as shown in FIG.
  • the closing end 1a of the current collector 1 extends beyond the closing end of the separator 3 by three quarters.
  • the closing end 1a of the first current collector 1 extends beyond the closing end of the separator 3. This makes it possible to have a sufficient safety distance between the first current collector 1 and the second current collector 2, so that the safety of the battery cells can be improved.
  • the closing end 1a of the first current collector 1 is located in the first straight section p1 or the second straight section p2.
  • the closing end 1a of the first current collector 1 is located in a straight section, so that the closing end 1a of the first current collector 1 is easily arranged and fixed, so that the overall reliability can be improved.
  • the closing end 1a of the first current collector 1 and the closing end 2a of the second current collector 2 have different arrangements, for example, as shown in FIGS. 1 to 7, the closing ends 1a and 2 of the first current collector 1
  • the closing ends 2a of the current collector 2 are both located in the first straight section p1 or the second straight section p2.
  • the closing end 1a of the first current collector 1 is located at the first straight section p1 or the second straight section p2
  • the closing end 2a of the second current collector 2 is located at the first straight line.
  • the segment p1 or the second straight segment p2, the closing end 1a of the first current collector 1 and the closing end 2a of the second current collector 2 are respectively located on both sides of the wound cell 10.
  • the closing end 1a of the first current collector 1 and the closing end 2a of the second current collector 2 may be arranged in different stages, and when the closing end 1a of the first current collector 1 is located in the first straight section p1, the second current collector 2 The closing end 2a is located in the second straight section p2, and when the closing end 2a of the second current collector 2 is located in the first straight section p1, the closing end 1a of the first current collector 1 is located in the second straight section p2.
  • the closing end 1a of the first current collector 1 and the closing end 2a of the second current collector 2 can be made flat. And stable, the overall thickness of the wound cell 10 is suitable.
  • wound cell 10 formed by winding the different first current collector 1 and second current collector 2 will be described below.
  • the first current collector 1 comprises: a first active material layer section 11, a first empty foil section 12 and a finishing section 13 connected in series, and the free end of the finishing section 13 is a finishing end 1a.
  • the surface of the first empty foil segment 12 is not provided with the active material layer 4, and the active material layer 4 is the first active material layer.
  • the first active material layer 11 is provided with a first active material layer on the surface thereof, and the first active material layer can be selected. Set on both sides, you can also choose one-sided settings.
  • the finishing section 13 is at least half a circle, and the connection point of the finishing section 13 and the first empty foil section 12 is indicated by a point c1;
  • the second current collector 2 comprises: a second active material layer section 21 and a second empty foil section 22 which are sequentially connected
  • the active material layer 4 is a second active material layer, and the first active material layer and the second active material layer may be the same or different.
  • a second active material layer is disposed on the surface of the second active material layer 21,
  • the wound cell 10 includes an empty foil segment opposing region, the empty foil segment opposing region, the partial region of the first empty foil segment 12 and the second empty foil segment 22 facing each other.
  • the second empty foil section 22 corresponds to the first empty foil section 12 in the winding direction. That is, the finishing section 13 is a portion of the first current collector 1 that is beyond the second current collector 2, so that the closing end 1a of the first current collector 1 can be made to exceed the second current collector 2 by appropriately setting the length of the finishing section 13.
  • the end 2a is at least half a turn.
  • an empty foil region ie, an empty foil segment opposing region
  • the current collector in the empty foil region can be formed in the wound cell 10
  • the surface is not provided with the active material layer 4, and the empty foil region can improve the safety of use of the wound cell 10.
  • first empty foil segment 12 and the second empty foil segment 22 have the same length, and the first empty foil segment 12 is half a turn to one turn.
  • the length of the first empty foil section 12 and the second empty foil section 22 may be one turn, of course, the first empty foil section 12 and the second empty foil section 22
  • the length can also be half a circle, three quarters of a circle, one half and a half.
  • the first empty foil section 12 and the second empty foil section 22 thus disposed can make the overall length of the empty foil region suitable, which can be advantageous for ensuring the safety of use of the wound cell 10.
  • the first current collector 1 comprises: a first active material layer segment 11 and a finishing section 13 connected in sequence, a first active material layer The surface of 4 is provided with an active material layer 4, the finishing section 13 is at least half a turn, the surface of the second current collector 2 is provided with an active material layer 4, and the active material layer 4 extends to the finishing end 2a of the second current collector 2.
  • the first current collector 1 and the second current collector 2 of this embodiment both omit the arrangement of the empty foil segments, and the wound battery cells 10 thus arranged are compact in structure and simple in arrangement.
  • the first bent portion of the first current collector 1 to the first current collector 1 is the initial portion 14 of the first current collector 1, along the roll
  • the region where the second current collector 2 ends 2a to 2 is first bent is the outer ring straight portion 23 of the second current collector 2
  • the first current collector The projection of the starting section 14 of 1 and the outer section of the second current collector 2 in the horizontal plane has no overlapping area.
  • the starting end 1b of the first current collector 1 and the closing end 2a of the second current collector 2 are not in error, up to two Adjacent to each other, it is possible to contribute to lowering the overall thickness of the wound cell 10, and it is possible to avoid an increase in the thickness of the wound cell 10.
  • the closing end 1a of the first current collector 1 is fixed in the present invention, and the closing end 1a of the first current collector 1 is bonded to the outermost circumference of the first current collector 1 by the adhesive 5 On the outer peripheral surface.
  • the use of the adhesive 5 on the one hand makes it possible to make the end 1a of the first current collector 1 close and simple and reliable, and on the other hand, the cost of the wound core 10 can be reduced.
  • the adhesive 5 has various options.
  • the adhesive 5 may be at least one of a single-sided adhesive, a double-sided adhesive, and a hot melt adhesive. Any of the above-mentioned adhesives 5 can effectively bond the trailing end 1a of the first current collector 1 to the secondary outer ring of the first current collector 1, and the bonding effect is good.
  • the adhesive 5 may be a double-sided tape or a hot-melt adhesive, and the adhesive 5 is also used to bond the package 20.
  • the adhesive 5 can be used not only for bonding the end 1a of the first current collector 1, but also for bonding the package 20, so that the adhesive 5 can be used in combination, thereby further saving costs.
  • the adhesive 5 is a single-sided adhesive
  • the wound core 10 is bonded with double-sided tape or hot melt adhesive on the other side away from the end 1 a of the first current collector 1 .
  • the double-sided tape or hot-melt adhesive is a bag adhesive 8
  • double-sided tape or hot-melt glue is also used to bond the bag 20 .
  • the adhesive 5 needs to be bonded to the opposite surfaces of the wound core 10, and specifically, the adhesive 5 is also bent to extend away from the end of the first current collector 1. One side, for example, extends to 0-20 mm away from the other side of the end of the first current collector 1. Thereby, the adhesive 5 can improve the overall reliability of the wound cell 10.
  • the wound core 10 further includes: a first tab 6 and a second tab 7, the first tab 6 being electrically connected to the first current collector 1, and the second tab 7 is electrically connected to the second current collector 2, the projection of the first tab 6 and the adhesive 5 at the horizontal plane does not overlap, or the projection of the second tab 7 and the adhesive 5 at the horizontal plane does not overlap.
  • the first tab 6, the second tab 7, and the adhesive 5 thus disposed can reduce the thickness of the wound cell 10.

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Abstract

一种卷绕式电芯，该卷绕式电芯包括：第一集流体和第二集流体，沿卷绕方向，第一集流体的收尾端超出第二集流体的收尾端至少半圈。本发明的发明人发现加长第一集流体的长度，并且使得第一集流体的收尾端超出第二集流体的收尾端至少半圈之后，会出现以下情况：卷绕式电芯的最外圈为第一集流体，次外圈为第一集流体，再次外圈才会为第二集流体，所以，在卷绕式电芯的最外圈和次外圈都为第一集流体，如此的话，即使第一集流体的收尾端撕裂，第一集流体的最外圈和次外圈之间接触也不会出现短路，其实质为同极之间的接触。

Description

卷绕式电芯 技术领域
本发明涉及电池技术领域，尤其涉及一种卷绕式电芯。
背景技术
相关技术中，锂离子电池滥用尤其是在跌落情况下很容易失效，发生安全事故，为改善跌落失效性能，通常采用双面胶或热熔胶等加强裸电芯与包装袋固定的方式，该方式可以减少裸电芯的移动碰撞，但该措施容易造成收尾空铝箔的撕裂，因在最外圈存在空箔或单面区，层与层之间摩擦力弱，容易位移撕裂，进一步引发短路问题。
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，本发明提出一种卷绕式电芯，该卷绕式电芯可以有效避免短路。
根据本发明的卷绕式电芯，包括：第一集流体和第二集流体，沿卷绕方向，所述第一集流体的收尾端超出所述第二集流体的收尾端至少半圈。
本发明的发明人发现加长第一集流体的长度，并且使得第一集流体的收尾端超出第二集流体的收尾端至少半圈之后，会出现以下情况：卷绕式电芯的最外圈为第一集流体，次外圈为第一集流体，再次外圈才会为第二集流体，所以，在卷绕式电芯的最外圈和次外圈都为第一集流体，如此的话，即使第一集流体的收尾端撕裂，第一集流体的最外圈和次外圈之间接触也不会出现短路，其实质为同极之间的接触。
在本发明的一些示例中，所述第一集流体的收尾端超出所述第二集流体的收尾端半圈至一圈。
在本发明的一些示例中，所述第一集流体的收尾端贴靠在所述第一集流体次外圈的外周面上。
在本发明的一些示例中，所述卷绕式电芯还包括：隔离膜，所述隔离膜间隔在所述第一集流体和所述第二集流体之间，沿卷绕方向，所述隔离膜的收尾端位于所述第一集流体的收尾端和所述第二集流体的收尾端之间。
在本发明的一些示例中，所述第一集流体的收尾端超出所述隔离膜的收尾端至少半 在本发明的一些示例中，所述卷绕式电芯包括：第一平直段、第一弯折段、第二平直段和第二弯折段，所述第一集流体的收尾端位于所述第一平直段或所述第二平直段。
在本发明的一些示例中，所述第一集流体的收尾端和所述第二集流体的收尾端均位于所述第一平直段或所述第二平直段。
在本发明的一些示例中，所述第一集流体的收尾端位于所述第一平直段或所述第二平直段，所述第二集流体的收尾端位于所述第一平直段或所述第二平直段，所述第一集流体的收尾端和所述第二集流体的收尾端分别位于所述卷绕式电芯的两侧。
在本发明的一些示例中，所述第一集流体包括：依次连接的第一活性材料层段、第一空箔段和收尾段，所述第一空箔段表面不设置第一活性材料，所述第一活性材料层段的表面上设置有第一活性材料层，所述收尾段为至少半圈；所述第二集流体包括：依次连接的第二活性材料层段和第二空箔段，所述第二活性材料层段的表面上设置有第二活性材料层，所述第二空箔段表面不设置第二活性材料层；所述卷绕式电芯包括空箔段相对区，所述空箔段相对区内，所述第一空箔段的部分区域与所述第二空箔段面向彼此。
在本发明的一些示例中，所述第一空箔段相对区为半圈至一圈。
在本发明的一些示例中，所述第一集流体包括：依次连接的第一活性材料层段和收尾段，所述第一活性材料层的表面设置有活性材料层，所述收尾段为至少半圈；所述第二集流体表面设置有活性材料层，所述活性材料层延伸至所述第二集流体的收尾端。
在本发明的一些示例中，沿卷绕方向，在所述第一集流体上，所述第一集流体的起始端至所述第一集流体第一次发生弯折的区域为所述第一集流体的起始段；沿卷绕反方向，第二集流体上，所述第二集流体收尾端至第二集流体最先发生弯折的区域为第二集流体的外圈平直段；所述第一集流体的起始段与所述第二集流体的外圈平直段在水平面的投影无重叠区域。
在本发明的一些示例中，所述第一集流体的收尾端通过粘接胶粘接在所述第一集流体最外圈的外周面上。
在本发明的一些示例中，所述粘接胶为单面胶、双面胶和热熔胶中的至少一种。
在本发明的一些示例中，所述粘接胶为双面胶或热熔胶，所述粘接胶还用于粘接包装袋。
在本发明的一些示例中，所述粘接胶为单面胶，所述卷绕式电芯在远离所述第一集流体收尾端的另一侧粘接有双面胶或热熔胶，所述双面胶或所述热熔胶还用于粘接包装袋。
在本发明的一些示例中，所述粘接胶还弯折延伸至远离所述第一集流体收尾端的另一侧。
在本发明的一些示例中，所述卷绕式电芯还包括：第一极耳和第二极耳，所述第一极耳与所述第一集流体电连接，所述第二极耳与所述第二集流体电连接，所述第一极耳和所述粘接胶在水平面的投影不重叠或所述第二极耳和所述粘结胶在水平面的投影不重叠。
在本发明的一些示例中，所述第一集流体为阴极集流体，所述第二集流体为阳极集流体；所述第一集流体主体材质为铝，所述第二集流体主体材质为铜。
在本发明的一些示例中，所述第一集流体为阳极集流体，所述第二集流体为阴极集流体；所述第一集流体主体材质为铜，所述第二集流体主体材质为铝。
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例的描述中将变得明显和容易理解，其中：
图1是根据本发明第一实施例的卷绕式电芯的示意图；
图2是根据本发明第二实施例的卷绕式电芯的示意图；
图3是根据本发明第三实施例的卷绕式电芯的示意图；
图4是根据本发明第四实施例的卷绕式电芯的示意图；
图5是根据本发明第五实施例的卷绕式电芯的示意图；
图6是根据本发明第六实施例的卷绕式电芯的示意图；
图7是根据本发明第七实施例的卷绕式电芯的示意图；
图8是根据本发明第八实施例的卷绕式电芯的示意图；
图9是根据本发明第九实施例的卷绕式电芯的示意图；
图10是根据本发明实施例的卷绕式电芯的第一角度的立体图；
图11是根据本发明实施例的卷绕式电芯的第二角度的立体图。
图12是根据本发明实施例的卷绕式电芯和包装袋的示意图。
附图标记：
卷绕式电芯10；
第一集流体1；第一集流体的收尾端1a；第一集流体的起始端1b；
第一活性材料层段11；第一空箔段12；收尾段13；起始段14；
第二集流体2；第二集流体的收尾端2a；第二集流体的起始端2b；第二活性材料层段21；第二空箔段22；外圈平直段23；
隔离膜3；活性材料层4；粘接胶5；
第一极耳6；第二极耳7；包装袋粘接胶8；
包装袋20；
第一平直段p1；第一弯折段w1；第二平直段p2；第二弯折段w2。
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，仅用于解释本发明，而不能理解为对本发明的限制。
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，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，除非另有说明，“多个”的含义是两个或两个以上。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；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。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明中的具体含义。
下面参考图1-图12详细描述根据本发明实施例的卷绕式电芯10。
如图1-图7所示，根据本发明实施例的卷绕式电芯10包括：第一集流体1和第二集流体2，沿卷绕方向，第一集流体1的收尾端1a超出第二集流体2的收尾端2a至少半圈。卷绕式电芯10的卷绕方向是指在如图1-图7所示各卷绕式电芯示意图上某一点沿着第一集流体1、第二集流体2或隔离膜3从内向外移动的方向为卷绕方向，卷绕方向可以有两种，即顺时针和逆时针卷绕，如图1-图3、图7所示，卷绕式电芯10的卷 绕方向均为顺时针，如图4-图6所示，卷绕式电芯10的卷绕方向均为逆时针。
一圈指的是从卷绕式电芯10上的某个点作为起始端开始计算，沿着卷绕方向一周到达另一个点定为结束端，结束端与起始端以及此圈的中心在一条直线上，起始端在结束端与此圈中心之间，半圈即为上述一圈的一半。例如，卷绕式电芯10包括：第一平直段p1、第一弯折段w1、第二平直段p2和第二弯折段w2，如图1-图7所述，第一平直段p1与第二平直段p2为卷绕式电芯10上与水平方向平行的部分，且第一平直段p1在卷绕式电芯10中心的上部，第二平直段p2在卷绕式电芯的下部；第一弯折段w1与第二弯折段w2为卷绕式电芯10上与竖直方向平行的部分，且第一弯折段w1在卷绕式电芯10中心的左边，第二卷绕段w2在卷绕式电芯10中心的右边。
半圈一般包括任意一个平直段和任意一个弯折段的组合，例如，第一平直段p1和第一弯折段w1的组合，又如，第一弯折段w1和第二平直段p2的组合。其中，在卷绕式电芯10卷绕时，第一集流体1和第二集流体2会形成有起始端和收尾端，起始端一般位于卷绕式电芯10的内部，收尾端一般位于卷绕式电芯10的外部。
其中，第一集流体1可以为阴极集流体，第二集流体2为阳极集流体；第一集流体1主体材质为铝，第二集流体2主体材质为铜。或者，第一集流体1为阳极集流体，第二集流体2为阴极集流体；第一集流体1主体材质为铜，第二集流体2主体材质为铝。如此设置的第一集流体1和第二集流体2可以使得卷绕式电芯10的设置简单。
需要说明的是，传统的第一集流体的收尾端也会超出第二集流体的收尾端一段长度，但是其长度远小于卷绕式电芯的半圈长度。这样就会存在一个问题，第一集流体的收尾端会由于特殊情况撕裂，撕裂之后如果内部层也撕裂，就会出现第一集流体和第二集流体接触并短路的问题，导致电芯的安全性较低。
并且，在本领域中，通过胶粘接包装袋20和电芯，虽然一定程度上起到固定电芯的作用，但是胶的粘性在电芯跌落时也会一定程度上导致第一集流体1的收尾端1a的撕裂。本领域技术人员考虑从胶的性能处入手，但是未能取得较好效果。
而且，在本领域中，电芯的发展方向是体积小，容量大，第一集流体1的增长将导致卷绕式电芯10的厚度增加，所以，本领域技术人员在避免增大集流体的长度。本发明的发明人发现加长第一集流体1的长度，并且使得第一集流体1的收尾端1a超出第二集流体2的收尾端2a至少半圈之后，会出现以下情况：卷绕式电芯10的最外圈为第一集流体1，次外圈为第一集流体1，再次外圈才会为第二集流体2，所以，在卷绕式电芯10的最外圈和次外圈都为第一集流体1，如此的话，即使第一集流体1的收尾端1a撕裂，第一集流体1的最外圈和次外圈之间接触也不会出现短路，其实质为同极 之间的接触。
由此，根据本发明实施例的卷绕式电芯10，通过合理设置第一集流体1的长度，即使第一集流体1的收尾端1a撕裂，第一集流体1的最外圈和次外圈之间接触也不会出现短路。
其中，第一集流体1的收尾端1a超出第二集流体2的收尾端2a半圈至一圈。例如，如图1、图2、图5和图7所示，第一集流体1的收尾端1a超出第二集流体2的收尾端2a四分之三圈，又如，如图3和图6所示，第一集流体1的收尾端1a超出第二集流体2的收尾端2a一圈，再如，如图4所示，第一集流体1的收尾端1a超出第二集流体2的收尾端2a半圈。如此设置的第一集流体1和第二集流体2厚度增加少，而且能够避免短路问题的出现。
可选地，如图1所示，第一集流体1的收尾端1a贴靠在第一集流体1次外圈的外周面上。由此，第一集流体1的最外圈和次外圈采用直接贴靠的方式，从而可以使得卷绕式电芯10整体结构可靠，而且可以有效避免第一集流体1和第二集流体2之间的短路。
具体地，如图1-图7所示，卷绕式电芯10还包括：隔离膜3，隔离膜3间隔在第一集流体1和第二集流体2之间，沿卷绕方向，隔离膜3的收尾端位于第一集流体1的收尾端1a和第二集流体2的收尾端2a之间。也就是说，沿卷绕方向，隔离膜3的收尾端超出第二集流体2的收尾端2a，第一集流体1的收尾端1a超出隔离膜3的收尾端。由此，隔离膜3可以沿卷绕方向有效隔离第一集流体1和第二集流体2，从而可以有效避免第一集流体1和第二集流体2接触，可以避免短路现象的发生。
进一步地，第一集流体1的收尾端1a超出隔离膜3的收尾端至少半圈。例如，如图1、图2、图4、图5和图7所示，第一集流体1的收尾端1a超出隔离膜3的收尾端半圈，又如，如图3所示，第一集流体1的收尾端1a超出隔离膜3的收尾端四分之三圈，再如，如图6所示，第一集流体1的收尾端1a超出隔离膜3的收尾端一圈。这样可以使得第一集流体1和第二集流体2之间具有足够安全距离，从而可以提高电芯的安全性。
另外，第一集流体1的收尾端1a位于第一平直段p1或者第二平直段p2。换言之，第一集流体1的收尾端1a位于一个平直段，这样第一集流体1的收尾端1a易于布置固定，从而可以有利于提升整体的可靠性。
其中，第一集流体1的收尾端1a和第二集流体2的收尾端2a具有不同的布置形式，例如，如图1-图7所示，第一集流体1的收尾端1a和第二集流体2的收尾端2a均位 于第一平直段p1或第二平直段p2。又如，如图8和图9所示，第一集流体1的收尾端1a位于第一平直段p1或第二平直段p2，第二集流体2的收尾端2a位于第一平直段p1或第二平直段p2，第一集流体1的收尾端1a和第二集流体2的收尾端2a分别位于卷绕式电芯10的两侧。换言之，第一集流体1的收尾端1a和第二集流体2的收尾端2a可以异段布置，当第一集流体1的收尾端1a位于第一平直段p1时，第二集流体2的收尾端2a位于第二平直段p2，当第二集流体2的收尾端2a位于第一平直段p1时，第一集流体1的收尾端1a位于第二平直段p2。由此，通过合理设置第一集流体1的收尾端1a和第二集流体2的收尾端2a的位置，可以使得第一集流体1的收尾端1a和第二集流体2的收尾端2a平整和稳定，卷绕式电芯10的整体厚度适宜。
下面再对应描述一下根据不同的第一集流体1和第二集流体2所卷绕形成的卷绕式电芯10。
根据本发明的一个可选实施例，第一集流体1包括：依次连接的第一活性材料层段11、第一空箔段12和收尾段13，收尾段13的自由端为收尾端1a，第一空箔段12表面不设置活性材料层4,活性材料4层为第一活性材料层，第一活性材料层段11的表面上设置有第一活性材料层，第一活性材料层可以选择两面设置，也可以选择单面设置。
收尾段13为至少半圈，收尾段13和第一空箔段12的连接点用点c1表示；第二集流体2包括：依次连接的第二活性材料层段21和第二空箔段22，第二空箔段22表面不设置活性材料层4，活性材料层4为第二活性材料层，其中第一活性材料层和第二活性材料层可以相同，或者也可以不同。第二活性材料层段21的表面上设置有第二活性材料层，
卷绕式电芯10包括空箔段相对区，空箔段相对区内，第一空箔段12的部分区域与第二空箔段22面向彼此。或者说，第二空箔段22与第一空箔段12沿卷绕方向相对应。也就是说，收尾段13为第一集流体1超出第二集流体2的部分，这样通过合理设置收尾段13的长度，可以使得第一集流体1的收尾端1a能够超出第二集流体2的收尾端2a至少半圈。由此，通过第一空箔段12和第二空箔段22的对应，可以在卷绕式电芯10内形成一个空箔区域，即空箔段相对区，该空箔区域内的集流体表面未设置有活性材料层4，空箔区域可以提升卷绕式电芯10的使用安全性。
具体地，第一空箔段12和第二空箔段22的长度相同，第一空箔段12为半圈至一圈。如图1、图2、图4和图7所示，第一空箔段12和第二空箔段22的长度可以为一圈，当然，第一空箔段12和第二空箔段22的长度还可以为半圈、四分之三圈、一圈半等。如此设置的第一空箔段12和第二空箔段22可以使得空箔区域整体长度适宜，可以有利于保证卷绕式电芯10的使用安全性。
根据本发明的另一个可选实施例，如图3、图5和图6所示，第一集流体1包括：依次连接的第一活性材料层段11和收尾段13，第一活性材料层4的表面设置有活性材料层4，收尾段13为至少半圈，第二集流体2表面设置有活性材料层4，活性材料层4延伸至第二集流体2的收尾端2a。相较于上述实施例，该实施例的第一集流体1和第二集流体2均省略了空箔段的设置，如此设置的卷绕式电芯10结构紧凑，布置简单。
沿卷绕方向，在第一集流体1上，第一集流体1的起始端1b至第一集流体1第一次发生弯折的区域为第一集流体1的起始段14,沿卷绕反方向，第二集流体2上，第二集流体2收尾端2a至第二集流体2最先发生弯折的区域为第二集流体2的外圈平直段23,第一集流体1的起始段14与第二集流体2的外圈平直段23在水平面的投影无重叠区域。也就是说，当卷绕式电芯10整体放置在有水平面上时，第一集流体1的起始端1b和第二集流体2的收尾端2a两者之间不会相错，最多两个彼此邻近，从而可以有利于降低卷绕式电芯10的整体厚度，可以避免卷绕式电芯10的厚度增加。
还需要说明的是，第一集流体1的收尾端1a的固定方式，在本发明中，第一集流体1的收尾端1a通过粘接胶5粘接在第一集流体1最外圈的外周面上。采用粘接胶5一方面可以使得第一集流体1的收尾端1a收尾简单可靠，另一方面可以降低卷绕式电芯10的成本。当然，粘接胶5有多种选择，例如，粘接胶5可以为单面胶、双面胶和热熔胶中的至少一种。上述任意一种的粘接胶5均可以有效将第一集流体1的收尾端1a粘接在第一集流体1的次外圈上，而且粘接效果好。
例如，结合图2和图12所示，粘接胶5可以为双面胶或者热熔胶，粘接胶5还用于粘接包装袋20。换言之，该粘接胶5不仅可以用于粘接第一集流体1的收尾端1a，还可以用于粘接包装袋20，这样该粘接胶5一体两用，从而可以进一步地节省成本。
又如，如图7所示，粘接胶5为单面胶，卷绕式电芯10在远离第一集流体1的收尾端1a的另一侧粘接有双面胶或热熔胶，该双面胶或热熔胶为包装袋粘接胶8，双面胶或热熔胶还用于粘接包装袋20。由此，通过将粘接第一集流体1的收尾端1a的粘接胶5和包装袋粘接胶8分离开，从而可以两者互不干涉，可以有利于卷绕式电芯10与包装袋20之间的粘接稳定性。
如图10和图11所示，粘接胶5需要粘接在卷绕式电芯10的两个相对表面，具体地，粘接胶5还弯折延伸至远离第一集流体1收尾端的另一侧，例如，延伸至至远离第一集流体1收尾端的另一侧0-20mm。由此，粘接胶5可以提高卷绕式电芯10的整体可靠性。
另外，如图3-图6所示，卷绕式电芯10还包括：第一极耳6和第二极耳7，第一 极耳6与第一集流体1电连接，第二极耳7与第二集流体2电连接，第一极耳6和粘接胶5在水平面的投影不重叠，或第二极耳7和粘结胶5在水平面的投影不重叠。如此设置的第一极耳6、第二极耳7和粘接胶5可以减小卷绕式电芯10的厚度。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示意性实施例”、“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一定指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何的一个或多个实施例或示例中以合适的方式结合。
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 (20)

  1. 一种卷绕式电芯，其特征在于，包括：第一集流体和第二集流体，沿卷绕方向，所述第一集流体的收尾端超出所述第二集流体的收尾端至少半圈。
  2. 根据权利要求1所述的卷绕式电芯，其特征在于，所述第一集流体的收尾端超出所述第二集流体的收尾端半圈至一圈。
  3. 根据权利要求1所述的卷绕式电芯，其特征在于，所述第一集流体的收尾端贴靠在所述第一集流体次外圈的外周面上。
  4. 根据权利要求1所述的卷绕式电芯，其特征在于，还包括：隔离膜，所述隔离膜间隔在所述第一集流体和所述第二集流体之间，沿卷绕方向，所述隔离膜的收尾端位于所述第一集流体的收尾端和所述第二集流体的收尾端之间。
  5. 根据权利要求4所述的卷绕式电芯，其特征在于，所述第一集流体的收尾端超出所述隔离膜的收尾端至少半圈。
  6. 根据权利要求1所述的卷绕式电芯，其特征在于，所述卷绕式电芯包括：第一平直段、第一弯折段、第二平直段和第二弯折段，所述第一集流体的收尾端位于所述第一平直段或所述第二平直段。
  7. 根据权利要求6所述的卷绕式电芯，其特征在于，所述第一集流体的收尾端和所述第二集流体的收尾端均位于所述第一平直段或所述第二平直段。
  8. 根据权利要求6所述的卷绕式电芯，其特征在于，所述第一集流体的收尾端位于所述第一平直段或所述第二平直段，所述第二集流体的收尾端位于所述第一平直段或所述第二平直段，所述第一集流体的收尾端和所述第二集流体的收尾端分别位于所述卷绕式电芯的两侧。
  9. 根据权利要求1所述的卷绕式电芯，其特征在于，所述第一集流体包括：依次连接的第一活性材料层段、第一空箔段和收尾段，所述第一空箔段表面不设置第一活性材料层，所述第一活性材料层段的表面上设置有第一活性材料层，所述收尾段为至少半圈；
    所述第二集流体包括：依次连接的第二活性材料层段和第二空箔段，所述第二活性材料层段的表面上设置有第二活性材料层，所述第二空箔段表面不设置第二活性材料层；
    所述卷绕式电芯包括空箔段相对区，所述空箔段相对区内，所述第一空箔段的部分区域与所述第二空箔段面向彼此。
  10. 根据权利要求9所述的卷绕式电芯，其特征在于，所述第一空箔段相对区为半圈至一圈。
  11. 根据权利要求1所述的卷绕式电芯，其特征在于，所述第一集流体包括：依次连接的第一活性材料层段和收尾段，所述第一活性材料层的表面设置有活性材料层，所述收 尾段为至少半圈；
    所述第二集流体表面设置有活性材料层，所述活性材料层延伸至所述第二集流体的收尾端。
  12. 根据权利要求1所述的卷绕式电芯，其特征在于，沿卷绕方向，在所述第一集流体上，所述第一集流体的起始端至所述第一集流体第一次发生弯折的区域为所述第一集流体的起始段；
    沿卷绕反方向，第二集流体上，所述第二集流体收尾端至第二集流体最先发生弯折的区域为第二集流体的外圈平直段；
    所述第一集流体的起始段与所述第二集流体的外圈平直段在水平面的投影无重叠区域。
  13. 根据权利要求1所述的卷绕式电芯，其特征在于，所述第一集流体的收尾端通过粘接胶粘接在所述第一集流体最外圈的外周面上。
  14. 根据权利要求13所述的卷绕式电芯，其特征在于，所述粘接胶为单面胶、双面胶和热熔胶中的至少一种。
  15. 根据权利要求14所述的卷绕式电芯，其特征在于，所述粘接胶为双面胶或热熔胶，所述粘接胶还用于粘接包装袋。
  16. 根据权利要求14所述的卷绕式电芯，其特征在于，所述粘接胶为单面胶，所述卷绕式电芯在远离所述第一集流体收尾端的另一侧粘接有双面胶或热熔胶，所述双面胶或所述热熔胶还用于粘接包装袋。
  17. 根据权利要求13所述的卷绕式电芯，其特征在于，所述粘接胶还弯折延伸至远离所述第一集流体收尾端的另一侧。
  18. 根据权利要求13所述的卷绕式电芯，其特征在于，还包括：第一极耳和第二极耳，所述第一极耳与所述第一集流体电连接，所述第二极耳与所述第二集流体电连接，所述第一极耳和所述粘接胶在水平面的投影不重叠或所述第二极耳和所述粘结胶在水平面的投影不重叠。
  19. 根据权利要求1所述的卷绕式电芯，其特征在于，所述第一集流体为阴极集流体，所述第二集流体为阳极集流体；所述第一集流体主体材质为铝，所述第二集流体主体材质为铜。
  20. 根据权利要求1所述的卷绕式电芯，其特征在于，所述第一集流体为阳极集流体，所述第二集流体为阴极集流体；所述第一集流体主体材质为铜，所述第二集流体主体材质为铝。
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