WO2017219345A1 - 卷绕式电芯 - Google Patents

卷绕式电芯 Download PDF

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Publication number
WO2017219345A1
WO2017219345A1 PCT/CN2016/087027 CN2016087027W WO2017219345A1 WO 2017219345 A1 WO2017219345 A1 WO 2017219345A1 CN 2016087027 W CN2016087027 W CN 2016087027W WO 2017219345 A1 WO2017219345 A1 WO 2017219345A1
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WO
WIPO (PCT)
Prior art keywords
tab
current collector
pole piece
active material
material layer
Prior art date
Application number
PCT/CN2016/087027
Other languages
English (en)
French (fr)
Inventor
郭培培
肖良针
高伟
王可飞
赵义
何平
Original Assignee
宁德新能源科技有限公司
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
Application filed by 宁德新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to CN201680083816.2A priority Critical patent/CN109565084A/zh
Priority to CN202210662249.3A priority patent/CN115020825A/zh
Priority to PCT/CN2016/087027 priority patent/WO2017219345A1/zh
Publication of WO2017219345A1 publication Critical patent/WO2017219345A1/zh
Priority to US16/194,539 priority patent/US11658344B2/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—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
    • 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
    • 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
    • H01M4/70—Carriers or collectors characterised by shape or form
    • 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
    • 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 batteries, and more particularly to a wound cell.
  • Figure 14 is a schematic view of winding of an embodiment of a wound cell in the prior art.
  • the wound cell includes a first pole piece 1, a first tab 2, a second pole piece 3, a second tab 4, and a separator 5.
  • the head of the first pole piece 1 ie, the first winding start segment B1
  • the head of the second pole piece 3 ie, the second winding start segment B2
  • the first pole The ear 2 and the second tab 4 are welded to the blank current collectors of the heads of the first pole piece 1 and the second pole piece 3, respectively, and then the insulating glue is respectively attached to the first tab 2 and the second tab 4.
  • 15 is a winding view of a prior art wound cell in another embodiment, in which a central portion of the first pole piece 1 and a middle portion of the second pole piece 3 are respectively provided with a first tab housing.
  • the groove 13 and the second tab receiving groove 33, and the first tab 2 and the second tab 4 are respectively received in the first tab receiving groove 13 on the first pole piece 1 and the second pole piece 3
  • the upper second tab is received in the recess 33.
  • the wound cell in FIG. 14 causes the position of the first tab 2 and the position of the second tab 4 to become the maximum thickness region of the battery, and the winding of the first tab 2 and the second tab 4 The size of the cell is wasted, resulting in a lower energy density of the cell. Further, since the first tab 2 and the second tab 4 are respectively located at the head of the first pole piece 1 and the head of the second pole piece 3, the DC resistance (DCR) of the wound cell is large. The wound cell in Fig. 15 is easily deformed during the cycle, and the cycle expansion ratio is large.
  • an object of the present invention is to provide a wound cell which improves the capacity density of the cell and reduces the internal resistance, and at the same time solves the problem that the cell is easily deformed during recycling.
  • the problem of large cyclic expansion rate is to provide a wound cell which improves the capacity density of the cell and reduces the internal resistance, and at the same time solves the problem that the cell is easily deformed during recycling.
  • the present invention provides a wound cell comprising: a first pole piece, a first tab, a second pole piece, a second tab, and a separator.
  • the first pole piece includes: a first current collector; and a first active material layer coated on a surface of the first current collector.
  • the second pole piece includes: a second current collector; and a second active material layer coated on a surface of the second current collector.
  • the isolation film is disposed between the first pole piece and the second pole piece to isolate the first pole piece and the second pole piece.
  • the first pole piece has a first winding start section, and the first active material layer is not coated on both the front and back surfaces of the first current collector of the first winding start stage and is defined as the first head A blank current collector, the first tab is fixed to the first head blank current collector.
  • a second pole receiving groove is formed in a middle portion of the second pole piece, a bottom portion of the second tab receiving groove is a second current collector, a circumferential side is a second active material layer, and a second pole is received in the second pole The second current collector is received in the recess and electrically connected to the second tab receiving groove.
  • the first tab is welded to the first head blank current collector
  • the second pole piece has a second tab receiving recess formed therein
  • the second tab is received in the second
  • the tab receives the second current collector in the recess and is electrically connected to the second tab receiving recess.
  • the wound cell of the present invention is significantly different from the wound cell shown in FIG. 14 in the prior art in that the first tab and the second tab are not simultaneously disposed on the head of the corresponding pole piece.
  • the internal resistance of the wound cell is reduced while the energy density of the cell is increased.
  • the wound type battery of the present invention is less likely to be deformed during the use of the wound battery core and has a lower cycle expansion ratio than the wound type battery core shown in Fig. 15 of the prior art.
  • FIG. 1 is a schematic view of winding of an unwound cell according to an embodiment of the present invention
  • Figure 2 is a schematic view of the second pole piece of Figure 1 after deployment
  • Figure 3 is a bottom view of Figure 2;
  • Figure 4 is a deformation view of Figure 3;
  • Figure 5 is a schematic view of the first pole piece of Figure 1 after deployment
  • Figure 6 is a plan view of Figure 5;
  • Figure 7 is a winding view of another embodiment of a wound cell according to the present invention.
  • Figure 8 is a deformation diagram of Figure 7, wherein the first tab is two;
  • Figure 9 is another variation of Figure 7;
  • Figure 10 is a perspective view showing the welding of the first tab and the third tab of Figure 1;
  • Figure 11 is a perspective view showing the welding of the first tab and the third tab of Figure 8;
  • Figure 12 is a perspective view showing the welding of the second and fourth tabs of Figure 1;
  • Figure 13 is a deformation diagram of Figure 12, wherein the second tab is two;
  • Figure 14 is a schematic view showing the winding of an electric winding core in an embodiment in the prior art
  • Figure 15 is a schematic view of winding of a prior art wound cell in another embodiment.
  • B1 first winding start section T2 second pole receiving groove is double-sided
  • a wound cell according to the present invention includes: a first pole piece 1, a first pole 2, a second pole piece 3, a second tab 4, and a separator. 5.
  • the first pole piece 1 includes: a first current collector 11; and a first active material layer 12 coated on a surface of the first current collector 11.
  • the second pole piece 3 includes: a second current collector 31; and a second active material layer 32 coated on the surface of the second current collector 31.
  • the separator 5 is disposed between the first pole piece 1 and the second pole piece 3 to isolate the first pole piece 1 and the second pole piece 3.
  • the first pole piece 1 has a first winding start segment B1, and the first winding start segment B1 is first
  • the first active material layer 12 is not coated on both the front and back surfaces of the current collector 11, and is defined as a first head blank current collector 111, and the first tab 2 is welded to the first head blank current collector 111.
  • the middle portion of the second pole piece 3 (the portion between the second winding start section B2 and the second winding end section D2 of the second pole piece 3 described below) is formed with the second tab receiving groove 33
  • the bottom of the second tab receiving recess 33 is a second current collector 31 and the peripheral side is a second active material layer 32.
  • the second tab 4 is received in the second tab receiving recess 33 and electrically connected to the second. The tabs receive the second current collector 31 at the recess 33.
  • the first tab 2 is fixed (eg, soldered, bonded) to the first head blank current collector 111, and the second tab 4 is received in the middle of the second pole piece 3
  • the second tab is received in the recess 33 and electrically connected to the second current collector 31 at the second tab receiving recess 33.
  • the wound cell of the present invention is compared with the wound cell shown in FIG. 13 in the prior art, since the first tab 2 and the second tab 4 are not simultaneously disposed in the winding of the corresponding pole piece. At the beginning, the internal resistance of the wound cell is significantly reduced while the energy density of the cell is increased.
  • the wound type electric core of the present invention is less likely to be deformed during the use of the wound electric core, and the cycle expansion ratio of the electric core is lowered. .
  • the circumferential side of the second tab receiving recess 33 may be open on one side of the three sides.
  • the circumferential side of the second tab receiving recess 33 may be closed on both sides by both sides.
  • the second active material layer 32 not only expands along the thickness direction of the second pole piece 3 (ie, the thickness direction T of the wound cell), thereby increasing the wound cell
  • the thickness of the second active material layer 32 also expands along the length direction of the second pole piece 3, thereby squeezing the thickness direction T to further increase the thickness of the wound cell. Since the circumferential side of the second tab receiving groove 33 closes both sides of the opening, the expansion force along the longitudinal direction of the second pole piece 3 is effectively released, so that the thickness direction T is not squeezed.
  • the thickness of the wound cell is reduced to a lesser extent.
  • the second pole piece 3 has a second winding start section B2.
  • the first winding start section B1 and the second winding start section B2 may respectively extend in different directions in the longitudinal direction (as shown in FIGS. 1, 7, 8, and 9).
  • the first winding start section B1 and the second winding start section B2 extend in the same direction in the longitudinal direction as shown in FIGS. 14 and 15.
  • both surfaces of the second current collector 31 of the second winding start segment B2 are coated
  • the second active material layer 32 is coated. The application of the second active material layer 32 to both faces of the second current collector 31 of the second winding start section B2 increases the energy density of the wound cell.
  • the first pole piece 1 may further have: a first winding finishing section D1, and the first current collecting body 11 of the first winding finishing section D1 is neither on both sides.
  • the first active material layer 12 is coated and defined as a first tail blank current collector 112.
  • the first tab 2 can be two, and the two first tabs 2 are substantially aligned in the thickness direction T of the wound cell.
  • One of the first tabs 2 is welded to the first head blank current collector 111, and the other first tab 2 is soldered to the first tail blank current collector 112, thereby reducing the DC resistance (DCR) of the wound cell.
  • DCR DC resistance
  • the wound cell may further include: a third tab 6 soldered to one end of the first tab 2 that is led out to the outside of the wound cell.
  • the width of the third tab 6 is smaller than the width of the first tab 2, and the thickness of the third tab 6 is greater than the thickness of the first tab 2, thereby ensuring the strength and strength of the third tab 6.
  • the overcurrent cross-sectional area reduces the maximum thickness of the cell after soldering of the first tab 2, and increases the energy density of the cell.
  • the second pole piece 3 may further have: a second winding finishing section D2, wherein both sides of the second current collector 31 of the second winding finishing section D2 may be coated
  • the second active material layer 32 is coated with the second active material layer 32 on only one side or the second active material layer 32 is not coated on both sides.
  • the second tabs 4 can be two, and correspondingly, the second tab receiving recesses 33 are two.
  • the two second tabs 4 are respectively received in the corresponding second tab receiving recesses 33 and are substantially aligned in the thickness direction T of the wound cells.
  • the wound cell may further include: a fourth tab 7 soldered to one end of the second tab 4 that is led out to the outside of the wound cell.
  • the width of the fourth tab 7 is smaller than the width of the second tab 4, and the thickness of the fourth tab 7 is greater than the thickness of the second tab 4, thereby ensuring the strength and strength of the fourth tab 7.
  • the cross-sectional area of the flow reduces the maximum thickness of the battery core after welding of the second tab 4, and improves the energy density of the battery core. degree.
  • the second pole receiving groove 33 is formed in the middle of the second pole piece 3, and the second tab receiving groove 33 is disposed on the second pole piece 3 at the second winding start. A portion between the segment B2 and the second winding finishing section D2.
  • the second tab receiving groove 33 is disposed at an intermediate portion of the second pole piece 3 between the second winding start section B2 and the second winding finishing section T2, which is a preferred second of the present invention. The position in which the tabs receive the recess 33 is provided, so that the internal resistance of the wound cell can be remarkably reduced.
  • the first tab 2 may be electrically connected to the first head blank current collector 111 by ultrasonic welding, laser welding or thermocompression bonding.
  • the second tab 4 may be electrically connected to the second current collector 31 at the second tab receiving recess 33 by ultrasonic welding, laser welding or thermocompression bonding.
  • the second pole piece 3 is further formed with a second tab pairing recess 34 , the bottom is a second current collector 31 and the circumference side is The second active material layer 32 is located on the opposite side of the second tab housing recess 33. Similar to the second tab receiving recess 33, the circumferential side of the second tab pairing recess 34 may be open on one side of the three sides, or both sides may be closed on both sides. Providing the second tab pairing recess 34 facilitates soldering of the second tab 4 within the second tab receiving recess 33.
  • the second tab receiving recess 33 may be formed by removing a corresponding portion of the second active material layer 32 by laser cleaning or mechanical cleaning to expose the second current collector 31.
  • the second tab receiving groove 33 can be coated on the second current collector 31 and then dried and dried by applying the cathode diaphragm slurry to the second current collector 31.
  • the second active material layer 32 is formed to be formed, and the heat-sensitive styrofoam paper is peeled off from the second current collector 31 when the cathode film slurry is dried.
  • the second tab pairing recess 34 may be formed by removing a corresponding portion of the second active material layer 32 by laser cleaning or mechanical cleaning to expose the second current collector 31.
  • the second tab pairing recess 34 can be applied to the second current collector 31 by applying a thermal film of the thermal film before and after coating the cathode film paste, and then drying and drying the cathode film slurry.
  • the second active material layer 32 is formed and peeled off from the second current collector 31 when the cathode film slurry is dried.
  • the wound cell may further include: a double-sided insulating tape T1 for the first tab, The separator 5 and the first tab 2 are bonded to each other on both sides.
  • the wound cell may further include: a double-sided insulating tape T2 for the second tab receiving groove, covering a portion of the second pole around the second tab 4 and the second tab 4 The ear receives the groove 33.
  • the wound cell may further include: a double-sided insulating tape T3 for the second tab-shaped recess, covering the entire second-pole matching recess 34, and respectively bonding the separation film 5 on both sides
  • the second active material layer 32 around the recess 34 is matched with the second tab.
  • the double-sided insulating tape T1 for the first tab and the double-sided insulating tape T2 for the second tab-accommodating recess and the double-sided insulating tape T3 for the second tab-shaped recess are double-sided insulated.
  • the bonding area of the tape is tighter than that of the single-sided insulating tape, so that the integrity of the wound cell is strengthened, thereby preventing the winding cell from becoming the largest deformation zone after the shaping process and the charging and discharging expansion. .
  • the double-sided insulating tape T1 for the first tab has a tackiness when the double-sided initial is used, or a single-sided initial adhesive is present, and the other single surface is subjected to subsequent hot pressing or cold pressing. Sticky double-sided tape.
  • the second-pole insulating tape T2 has a tackiness when the double-sided insulating tape T2 is initially used, or a single-sided initial adhesive is present, and the other single-sided is subjected to subsequent hot pressing or Adhesive double-sided tape after cold pressing.
  • the second tab-shaped recessed portion has a double-sided insulating tape T3 which is initially viscous when both sides are double-sided or has a viscous one-sided initial and another single-sided is subjected to subsequent hot pressing or cold Adhesive double-sided tape after pressing.
  • the double-sided insulating tape T1 for the first tab the double-sided insulating tape T2 for the second tab-accommodating recess, and the double-sided insulating tape T3 for the second tab-shaped recess include the substrate and the coating. a layer of glue overlying the two surfaces of the substrate.
  • the adhesive layer of the double-sided adhesive tape which has been viscous on both sides may be a styrene-butadiene rubber layer, a polyurethane layer, a polyacrylate layer or a polyvinylidene fluoride layer.
  • a single layer of adhesive layer which is initially viscous may be a styrene-butadiene rubber layer, a polyurethane layer, a polyacrylate layer or a polyvinylidene fluoride layer; and the other side is a temperature-sensitive adhesive layer which is viscous after subsequent hot pressing or cold pressing, and may be a temperature-sensitive adhesive which has no initial tack at normal temperature or has no initial temperature at normal temperature.
  • a viscous pressure sensitive adhesive may be a temperature-sensitive adhesive which has no initial tack at normal temperature or has no initial temperature at normal temperature.
  • the size of the first tab 2 may coincide with the size of the second tab 4. Further, the first tab 2 may have a width of 6 mm and a thickness of 0.06 mm. The width of the second tab 4 is 6mm, thickness is 0.06mm.
  • the first active material layer 12 of the first pole piece 1 may have a thickness of 131 ⁇ m
  • the second active material layer 32 of the second pole piece 3 may have a thickness of 112 ⁇ m.
  • the first pole piece 1 may be a positive pole piece and the second pole piece 3 is a negative pole piece
  • the first current collector 11 is a positive current collector and the second current collector 31 is a negative current collector
  • the first active The substance layer 12 is a positive electrode active material layer and the second active material layer 32 is a negative electrode active material layer.
  • the first pole piece 1 may be a negative pole piece and the second pole piece 3 is a positive pole piece
  • the first current collector 11 is a negative current collector and the second current collector 31 is a negative current collector
  • the first active The material layer 12 is a negative electrode active material layer and the second active material layer 32 is a positive electrode active material layer.
  • first winding start segment B1 of the first pole piece 1 described above is a layer of the first pole piece 1 on the side of the winding center (ie, immediately adjacent to the winding needle) in the thickness direction T.
  • the first winding start section B1 may have only a flat portion as shown in Figs. 1, 7, and 8; or the first pole piece 1 of the layer may have a flat portion and a fold back from the flat portion Part, as shown in Figure 9).
  • the first winding end section D1 of the first pole piece 1 is the first pole piece 1 in which the first pole piece 1 is in the outermost layer of the wound cell.
  • the second winding start section B2 of the second pole piece 2 is a layer of the second pole piece 2 adjacent to the other side of the winding center in the thickness direction T (again, the second winding start section B2 may have only The flat portion is as shown in Figs. 1, 7, and 8; or the second pole piece 2 of the layer may have a flat portion and a folded back portion folded back from the flat portion, as shown in Fig. 9).
  • the second winding end section D2 of the second pole piece 2 is the second pole piece 2 in which the second pole piece 2 is on the outermost layer of the wound cell.
  • the wound cell according to the present invention is used for a flexible package lithium ion battery and is exemplified as an example and a comparative example and test result.
  • the first pole piece 1 is a negative electrode piece and the second pole piece 3 is a positive electrode piece.
  • the finished battery thickness is 4.6mm, the width is 40mm, the length is 90mm).
  • the first tab 2 and the second tab 4 are the same size, that is, the welding length of the tab is 15mm.
  • the ear width is 6 mm and the thickness is 0.06 mm.
  • the pole piece after the cold pressing process (the thickness of the one-side first active material layer 12 of the first pole piece 1 is 131 ⁇ m, and the one-side second active material layer 32 of the second pole piece 3) Thick Degree 112 ⁇ m), the first tab 2 is soldered to the first head blank current collector 111 of the first pole piece 1 by ultrasonic welding or brazing or electric resistance welding; the second pole piece 3 is used by laser or placeholder method.
  • the middle portion cleans or reserves the second tab receiving recess 33 and the second tab matching recess 34 for soldering the second tab 4, and then soldering the second tab 4 by ultrasonic welding or soldering or electric resistance welding It is into the second tab receiving groove 33.
  • the first active material layer 12 is made of graphite, and the second active material layer 32 is made of lithium cobaltate.
  • the peripheral side of the second tab accommodation groove 33 is open on one side of the three sides.
  • Embodiment 1 The difference from Embodiment 1 is that the circumferential side of the second tab accommodation groove 33 is closed on both sides by both sides.
  • the structure shown in FIG. 13 is different from that of the first embodiment: no recess is formed in the second pole piece 3 and the first pole piece 1, and the first tab 2 and the second tab 4 are respectively soldered.
  • the first head blank current collector 111 of the first winding start section B1 of the pole piece 1 and the second head blank current collector 31 of the second winding start section B2 of the second pole piece 3 are formed.
  • the first pole piece 1 has a first tab receiving groove 13 for receiving the first tab 2, and the second pole piece 3 is provided with a second one.
  • the second tab of the tab 4 receives the recess 33 and completes the welding of the first tab 2 with the first tab receiving recess 13 and the welding of the second tab 4 and the second tab receiving recess 33.
  • Example 1-2 and Comparative Example 1-2 20 soft-package lithium-ion battery samples were respectively selected for 1000 cycles of charge and discharge test, and the thickness of the sample before and after the test was measured, and the test sample of the flexible package lithium ion battery was tested. The lithium was disassembled and observed, and the results are shown in Table 1.
  • Capacity test The battery is charged to the nominal upper limit voltage with a nominal current, and then discharged at the nominal current to the amount of power released by the cut-off voltage.
  • Thickness test Measured with a thickness gauge.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

一种卷绕式电芯，包括：第一极片（1）、第一极耳（2）、第二极片（3）、第二极耳（4）以及隔离膜（5）。第一极片包括第一集流体（11）和第一活性物质层（12）。第二极片包括第二集流体（31）和第二活性物质层（32）。第一极片的第一卷绕起始段（B1）的第一集流体的正反两个表面上均未涂覆第一活性物质层并定义为第一头部空白集流体（111），第一头部空白集流体焊接于一个第一极耳。第二极片形成有第二极耳收容凹槽（33），第二极耳收容凹槽的底部为第二集流体而周侧为第二活性物质层，第二极耳收容于第二极耳收容凹槽内并电连接于第二极耳收容凹槽处的第二集流体。该卷绕式电芯提高了卷绕式电芯的容量密度并降低了内阻，解决了电芯在循环使用过程中容易变形、循环膨胀率较大的问题。

Description

卷绕式电芯 技术领域
本发明涉及电池领域，尤其涉及一种卷绕式电芯。
背景技术
图14是现有技术中的卷绕式电芯的在一实施例中的卷绕示意图。卷绕式电芯包括第一极片1、第一极耳2、第二极片3、第二极耳4以及隔离膜5。其中，第一极片1的头部(即第一卷绕起始段B1)和第二极片3的头部(即第二卷绕起始段B2)均为空白集流体，第一极耳2和第二极耳4分别焊接于第一极片1和第二极片3的头部的空白集流体上，然后在第一极耳2和第二极耳4上分别粘贴绝缘胶。图15是现有技术中的卷绕式电芯的在另一实施例中的卷绕示意图，其中，第一极片1的中部和第二极片3的中部分别开设有第一极耳收容凹槽13和第二极耳收容凹槽33，并且第一极耳2和第二极耳4分别收容于第一极片1上的第一极耳收容凹槽13内和第二极片3上的第二极耳收容凹槽33内。
图14中的卷绕式电芯会造成第一极耳2所在位置和第二极耳4所在位置成为电池的最大厚度区，而第一极耳2和第二极耳4以外的卷绕式电芯的尺寸空间白白浪费，进而导致电芯能量密度较低。此外，由于第一极耳2和第二极耳4分别位于第一极片1的头部和第二极片3的头部，从而导致卷绕式电芯的直流电阻(DCR)较大。图15中的卷绕式电芯在循环过程中容易变形，循环膨胀率较大。
发明内容
鉴于背景技术中存在的问题，本发明的目的在于提供一种卷绕式电芯，其提升了电芯的容量密度并减小了内阻，同时解决了电芯在循环使用过程中容易变形、循环膨胀率较大的问题。
为了实现上述目的，本发明提供了一种卷绕式电芯，其包括：第一极片、 第一极耳、第二极片、第二极耳以及隔离膜。
第一极片包括：第一集流体；以及第一活性物质层，涂覆在第一集流体的表面上。第二极片包括：第二集流体；以及第二活性物质层，涂覆在第二集流体的表面上。隔离膜设置于第一极片和第二极片之间，以将第一极片和第二极片隔离开。
其中，第一极片具有第一卷绕起始段，第一卷绕起始段的第一集流体的正反两个表面上均未涂覆第一活性物质层并定义为第一头部空白集流体，第一极耳固定于第一头部空白集流体。第二极片的中部形成有第二极耳收容凹槽，第二极耳收容凹槽的底部为第二集流体而周侧为第二活性物质层，第二极耳收容于第二极耳收容凹槽内并电连接于第二极耳收容凹槽处的第二集流体。
本发明的有益效果如下：
在根据本发明的卷绕式电芯中，第一极耳焊接于第一头部空白集流体，第二极片的中部形成有第二极耳收容凹槽，第二极耳收容于第二极耳收容凹槽内并电连接于第二极耳收容凹槽处的第二集流体。本发明的卷绕式电芯与现有技术中图14所示的卷绕式电芯相比，由于未将第一极耳和第二极耳同时设置在相应极片的头部，从而明显降低了卷绕式电芯的内阻同时提高了电芯的能量密度。本发明的卷绕式电芯与现有技术中图15所示的卷绕式电芯相比，在卷绕式电芯循环使用过程中更不容易变形，并降低了循环膨胀率。
附图说明
图1是根据本发明的卷绕式电芯的在一实施例中的卷绕示意图；
图2是图1中的第二极片展开后的示意图；
图3是图2的仰视图；
图4是图3的变形图；
图5是图1中的第一极片展开后的示意图；
图6是图5的俯视图；
图7是根据本发明的卷绕式电芯的在另一实施例中的卷绕示意图；
图8是图7的变形图，其中第一极耳为两个；
图9是图7的另一变形图；
图10是图1中的第一极耳与第三极耳的焊接立体示意图；
图11是图8中的第一极耳与第三极耳的焊接立体示意图；
图12是图1中的第二极耳与第四极耳的焊接立体示意图；
图13是图12的变形图，其中第二极耳为两个；
图14是现有技术中的卷绕式电芯的在一实施例中的卷绕示意图；
图15是现有技术中的卷绕式电芯的在另一实施例中的卷绕示意图。
其中，附图标记说明如下：
1第一极片                B2第二卷绕起始段
11第一集流体             D2第二卷绕收尾段
111第一空白集流体        4第二极耳
12第一活性物质层         5隔离膜
13第一极耳收容凹槽       T1第一极耳用双面绝缘胶带
B1第一卷绕起始段         T2第二极耳收容凹槽用双面绝
D1第一卷绕收尾段         缘胶带
2第一极耳                T3第二极耳配对凹部用双面绝
3第二极片                缘胶带
31第二集流体             6第三极耳
32第二活性物质层         7第四极耳
33第二极耳收容凹槽       T厚度方向
34第二极耳配对凹部
具体实施方式
下面参照附图来详细说明根据本发明的卷绕式电芯。
参照图1，图7、图8和图9，根据本发明的卷绕式电芯包括：第一极片1、第一极耳2、第二极片3、第二极耳4以及隔离膜5。
第一极片1包括：第一集流体11；以及第一活性物质层12，涂覆在第一集流体11的表面上。第二极片3包括：第二集流体31；以及第二活性物质层32，涂覆在第二集流体31的表面上。隔离膜5设置于第一极片1和第二极片3之间，以将第一极片1和第二极片3隔离开。
其中，第一极片1具有第一卷绕起始段B1，第一卷绕起始段B1的第一 集流体11的正反两个表面上均未涂覆第一活性物质层12并定义为第一头部空白集流体111，第一极耳2焊接于第一头部空白集流体111。第二极片3的中部(如下面所述的第二极片3的第二卷绕起始段B2与第二卷绕收尾段D2之间的部分)形成有第二极耳收容凹槽33，第二极耳收容凹槽33的底部为第二集流体31而周侧为第二活性物质层32，第二极耳4收容于第二极耳收容凹槽33内并电连接于第二极耳收容凹槽33处的第二集流体31。
在根据本发明的卷绕式电芯中，第一极耳2固定于(例如焊接，粘接)第一头部空白集流体111，第二极耳4收容于第二极片3中部的第二极耳收容凹槽33内并电连接于第二极耳收容凹槽33处的第二集流体31。本发明的卷绕式电芯与现有技术中图13所示的卷绕式电芯相比，由于未将第一极耳2和第二极耳4同时设置在相应极片的卷绕起始段，从而明显降低了卷绕式电芯的内阻同时提高了电芯的能量密度。本发明的卷绕式电芯与现有技术中图14所示的卷绕式电芯相比，在卷绕式电芯循环使用过程中更不容易变形，并降低了电芯的循环膨胀率。
根据本发明的卷绕式电芯，在一实施例中，参照图3，第二极耳收容凹槽33的周侧可为三边封闭一边开口。
在一实施例中，参照图4，第二极耳收容凹槽33的周侧可为两边封闭两边开口。卷绕式电芯在充放电后，第二活性物质层32不仅会沿着第二极片3的厚度方向(即卷绕式电芯的厚度方向T)发生膨胀，从而增加卷绕式电芯的厚度，而且第二活性物质层32还会沿着第二极片3的长度方向发生膨胀，从而对厚度方向T产生挤压进而进一步增加卷绕式电芯的厚度。由于第二极耳收容凹槽33的周侧为两边封闭两边开口，从而使沿着第二极片3的长度方向的膨胀力得到有效释放，从而不会对厚度方向T产生挤压，在一定程度上减小了卷绕式电芯的厚度。
在一实施例中，参照图1，图7、图8和图9，第二极片3具有第二卷绕起始段B2。第一卷绕起始段B1和第二卷绕起始段B2在长度方向上可分别朝着不同的方向延伸(如图1、图7、图8和图9所示)。或者，第一卷绕起始段B1和第二卷绕起始段B2如图14和图15所示的那样在长度方向上朝着相同的方向延伸。
在一实施例中，第二卷绕起始段B2的第二集流体31的两个表面上均涂 覆有第二活性物质层32。第二活性物质层32涂覆在第二卷绕起始段B2的第二集流体31的两面上提高了卷绕式电芯的能量密度。
在一实施例中，参照图7、图8和图9，第一极片1还可具有：第一卷绕收尾段D1，第一卷绕收尾段D1的第一集流体11的两面均未涂覆第一活性物质层12并定义为第一尾部空白集流体112。
在一实施例中，参照图8和图9，第一极耳2可为两个，两个第一极耳2在卷绕式电芯的厚度方向T上大致对齐。其中一个第一极耳2焊接于第一头部空白集流体111，另一个第一极耳2焊接于第一尾部空白集流体112，从而减小了卷绕式电芯的直流电阻(DCR)和电芯在充放电时的产热量，且电芯的电流密度分布更均匀。
在一实施例中，参照图10和图11，卷绕式电芯还可包括：第三极耳6，焊接于第一极耳2的引出到卷绕式电芯外部的一端。
在一实施例中，第三极耳6的宽度小于第一极耳2的宽度，并且第三极耳6的厚度大于第一极耳2的厚度，从而在保证第三极耳6的强度和过流截面积的同时减小了第一极耳2焊接后电芯的最大厚度，提高了电芯的能量密度。
在一实施例中，参照图1和图8，第二极片3还可具有：第二卷绕收尾段D2，其中第二卷绕收尾段D2的第二集流体31的两面可以均涂覆第二活性物质层32或者只在一面涂覆第二活性物质层32或者两面均未涂覆第二活性物质层32。
在一实施例中，第二极耳4可为两个，相应地，第二极耳收容凹槽33为两个。两个第二极耳4分别收容于对应的第二极耳收容凹槽33中，且在卷绕式电芯的厚度方向T上大致对齐。
在这里补充说明的是，当第一极耳2和第二极耳4的数量适当地增加时，卷绕式电芯的充放电倍率也相应地增加。
在一实施例中，参照图12和图13，卷绕式电芯还可包括：第四极耳7，焊接于第二极耳4的引出到卷绕式电芯外部的一端。
在一实施例中，第四极耳7的宽度小于第二极耳4的宽度，并且第四极耳7的厚度大于第二极耳4的厚度，从而在保证第四极耳7的强度和过流截面积的同时减小了第二极耳4焊接后电芯的最大厚度，提高了电芯的能量密 度。
在这里补充说明的是，第二极片3的中部形成有第二极耳收容凹槽33指的是第二极耳收容凹槽33设置于第二极片3的处于第二卷绕起始段B2与第二卷绕收尾段D2之间的部分。优选地，第二极耳收容凹槽33设置于第二极片3的处于第二卷绕起始段B2与第二卷绕收尾段T2之间的中间部分，这是本发明优选的第二极耳收容凹槽33的设置位置，从而可以显著地减小卷绕式电芯的内阻。
在一实施例中，第一极耳2可采用超声波焊接、激光焊接或热压焊接方式电连接于第一头部空白集流体111。
在一实施例中，第二极耳4可采用超声波焊接、激光焊接或热压焊接方式电连接于第二极耳收容凹槽33处的第二集流体31。
在一实施例中，参照图1、图2、图7、图8和图9，第二极片3还形成有：第二极耳配对凹部34，底部为第二集流体31而周侧为第二活性物质层32，位于第二极耳收容凹槽33的正对背侧。与第二极耳收容凹槽33类似，第二极耳配对凹部34的周侧可为三边封闭一边开口，也可为两边封闭两边开口。设置第二极耳配对凹部34有利于第二极耳4焊接于第二极耳收容凹槽33内。
在一实施例中，第二极耳收容凹槽33可通过激光清洗或机械清洗将第二活性物质层32的对应部分去除以露出第二集流体31而形成。
在一实施例中，第二极耳收容凹槽33可通过涂覆阴极膜片浆料之前预置热敏型发泡胶纸在第二集流体31上、之后涂覆并干燥阴极膜片浆料以形成第二活性物质层32且在干燥阴极膜片浆料时热敏型发泡胶纸从第二集流体31上剥离形成。
在一实施例中，第二极耳配对凹部34可通过激光清洗或机械清洗将第二活性物质层32的对应部分去除以露出第二集流体31而形成。
在一实施例中，第二极耳配对凹部34可通过涂覆阴极膜片浆料之前预置热敏型发泡胶纸在第二集流体31上、之后涂覆并干燥阴极膜片浆料以形成第二活性物质层32且在干燥阴极膜片浆料时热敏型发泡胶纸从第二集流体31上剥离形成。
在一实施例中，所述卷绕式电芯还可包括：第一极耳用双面绝缘胶带T1， 在两面上分别粘接隔离膜5和第一极耳2。
在一实施例中，所述卷绕式电芯还可包括：第二极耳收容凹槽用双面绝缘胶带T2，覆盖整个第二极耳4及第二极耳4周围的部分第二极耳收容凹槽33。
在一实施例中，所述卷绕式电芯还可包括：第二极耳配对凹部用双面绝缘胶带T3，覆盖整个第二极耳配对凹部34，且在两面上分别粘接隔离膜5和第二极耳配对凹部34周围的第二活性物质层32。
在这里补充说明的是，由于第一极耳用双面绝缘胶带T1、第二极耳收容凹槽用双面绝缘胶带T2和第二极耳配对凹部用双面绝缘胶带T3均采用双面绝缘胶带，其粘接区域比采用单面绝缘胶带时更紧密，从而使得卷绕式电芯的整体性加强，进而避免卷绕式电芯在整形工序以及充放电膨胀后该区域隆起成为最大变形区。在一实施例中，第一极耳用双面绝缘胶带T1为双面初始时均已有粘性或是一个单面初始时已有粘性而另一单面是经后续的热压或冷压后有粘性的双面胶带。
在一实施例中，第二极耳收容凹槽用双面绝缘胶带T2为双面初始时均已有粘性或是一个单面初始时已有粘性而另一单面是经后续的热压或冷压后有粘性的双面胶带。
在一实施例中，第二极耳配对凹部用双面绝缘胶带T3为双面初始时均已有粘性或是一个单面初始时已有粘性而另一单面是经后续的热压或冷压后有粘性的双面胶带。
在这里补充说明的是，第一极耳用双面绝缘胶带T1、第二极耳收容凹槽用双面绝缘胶带T2和第二极耳配对凹部用双面绝缘胶带T3均包括基材和涂覆在基材的两个表面的胶层。双面初始时均已有粘性的双面胶带的胶层可以为丁苯橡胶层、聚氨酯层、聚丙烯酸酯层或聚偏氟乙烯层。在一个单面初始时已有粘性而另一单面是经后续的热压或冷压后有粘性的双面胶带中，一个单面初始时已有粘性的胶层可以为丁苯橡胶层、聚氨酯层、聚丙烯酸酯层或聚偏氟乙烯层；而另一单面是经后续的热压或冷压后有粘性的胶层可以为常温下无初粘性的温敏胶或常温下无初粘性的压敏胶。
在一实施例中，第一极耳2的尺寸可与第二极耳4的尺寸一致。进一步地，第一极耳2的宽度可为6mm，厚度可为0.06mm。第二极耳4的宽度为 6mm，厚度为0.06mm。
在一实施例中，第一极片1的第一活性物质层12的厚度可为131μm，第二极片3的第二活性物质层32的厚度可为112μm。
在一实施例中，第一极片1可为正极极片而第二极片3为负极极片，第一集流体11为正极集流体而第二集流体31为负极集流体，第一活性物质层12为正极活性物质层而第二活性物质层32为负极活性物质层。
在一实施例中，第一极片1可为负极极片而第二极片3为正极极片，第一集流体11为负极集流体而第二集流体31为负极集流体，第一活性物质层12为负极活性物质层而第二活性物质层32为正极活性物质层。
在这里补充说明的是上述所述的第一极片1的第一卷绕起始段B1为紧邻卷绕中心(即紧邻卷针)沿厚度方向T的一侧的一层第一极片1(第一卷绕起始段B1可仅具有平的部分，如图1、图7、图8所示；或者该层第一极片1可具有平的部分和从该平的部分回折的回折部分，如图9所示)。第一极片1的第一卷绕收尾段D1为第一极片1处于卷绕式电芯的最外侧一层的第一极片1。第二极片2的第二卷绕起始段B2为紧邻卷绕中心沿厚度方向T的另一侧的一层第二极片2(同样地，第二卷绕起始段B2可仅具有平的部分，如图1、图7、图8所示；或者该层第二极片2可具有平的部分和从该平的部分回折的回折部分，如图9所示)。第二极片2的第二卷绕收尾段D2为第二极片2处于卷绕式电芯的最外侧一层的第二极片2。
最后补充说明根据本发明的卷绕式电芯用于软包装锂离子电池并作为举例的实施例和对比例及测试结果。其中，在下面所述的实施例及对比例中第一极片1为负极极片而第二极片3为正极极片。
实施例1
以464090型号软包装锂离子电池(成品电池厚度为4.6mm、宽度为40mm、长度为90mm)为例，第一极耳2与第二极耳4尺寸一致，即极耳的焊接长度为15mm，极耳宽度为6mm、厚度为0.06mm。
采用图1所示的结构，经冷压工序后的极片(第一极片1的单侧第一活性物质层12的厚度为131μm、第二极片3的单侧第二活性物质层32的厚 度为112μm)，采用超声焊接或钎焊或电阻焊将第一极耳2焊接到第一极片1的第一头部空白集流体111上；采用激光或占位法在第二极片3的中部清洗或预留出用于焊接第二极耳4的第二极耳收容凹槽33和第二极耳配对凹部34，随后采用超声焊接或钎焊或电阻焊将第二极耳4焊接到第二极耳收容凹槽33中。第一活性物质层12采用石墨，第二活性物质层32采用钴酸锂。第二极耳收容凹槽33的周侧为三边封闭一边开口。
实施例2
与实施例1的不同之处：第二极耳收容凹槽33的周侧为两边封闭两边开口。
对比例1
采用如图13所示结构，与实施例1的不同之处：第二极片3和第一极片1上没有开设任何凹槽，第一极耳2和第二极耳4分别焊接在第一极片1的第一卷绕起始段B1的第一头部空白集流体111和第二极片3的第二卷绕起始段B2的第二头部空白集流体31上。
对比例2
采用如图14所示结构，与实施例1的不同之处：第一极片1上开设收容第一极耳2的第一极耳收容凹槽13，第二极片3上开设收容第二极耳4的第二极耳收容凹槽33，并完成第一极耳2与第一极耳收容凹槽13的焊接和第二极耳4与第二极耳收容凹槽33的焊接。
在实施例1-2和对比例1-2中分别选取20个软包装锂离子电池样品进行1000个循环充放电测试，对测试前后的样品的厚度进行测量，并且对测试后的软包装锂离子电池样品进行拆解观察析锂的情况，所得结果示如表1所示。
容量测试：采用标称电流将电芯充电到标称上限电压，然后再以标称电流放电到截至电压所释放出来的电量。
厚度测试：用测厚仪测量。
变形量＝(测试后平均厚度-测试前厚度)/测试前厚度*100％
表1实施例1-2与对比例1-2的测试结果
Figure PCTCN2016087027-appb-000001

Claims (17)

  1. 一种卷绕式电芯，包括：
    第一极片(1)，包括：
    第一集流体(11)；以及
    第一活性物质层(12)，涂覆在第一集流体(11)的表面上；
    第一极耳(2)；
    第二极片(3)，包括：
    第二集流体(31)；以及
    第二活性物质层(32)，涂覆在第二集流体(31)的表面上；
    第二极耳(4)；
    隔离膜(5)，设置于第一极片(1)和第二极片(3)之间，以将第一极片(1)和第二极片(3)隔离开；
    其特征在于，
    第一极片(1)具有第一卷绕起始段(B1)，第一卷绕起始段(B1)的第一集流体(11)的正反两个表面上均未涂覆第一活性物质层(12)并定义为第一头部空白集流体(111)，第一极耳(2)固定于第一头部空白集流体(111)；
    第二极片(3)的中部形成有第二极耳收容凹槽(33)，第二极耳收容凹槽(33)的底部为第二集流体(31)而周侧为第二活性物质层(32)，第二极耳(4)收容于第二极耳收容凹槽(33)内并电连接于第二极耳收容凹槽(33)处的第二集流体(31)。
  2. 根据权利要求1所述的卷绕式电芯，其特征在于，
    第二极耳收容凹槽(33)的周侧为三边封闭一边开口；或
    第二极耳收容凹槽(33)的周侧为两边封闭两边开口。
  3. 根据权利要求1所述的卷绕式电芯，其特征在于，
    第二极片(3)具有第二卷绕起始段(B2)；
    第一卷绕起始段(B1)和第二卷绕起始段(B2)在长度方向上分别朝着 不同的方向延伸；或
    第一卷绕起始段(B1)和第二卷绕起始段(B2)在长度方向上朝着相同的方向延伸。
  4. 根据权利要求3所述的卷绕式电芯，其特征在于，
    第二卷绕起始段(B2)的第二集流体(31)两个表面上均涂覆有第二活性物质层(32)。
  5. 根据权利要求3所述的卷绕式电芯，其特征在于，
    第一极片(1)还具有：第一卷绕收尾段(D1)，第一卷绕收尾段(D1)的第一集流体(11)的正反两个表面均未涂覆第一活性物质层(12)并定义为第一尾部空白集流体(112)。
  6. 根据权利要求5所述的卷绕式电芯，其特征在于，
    第一极耳(2)为两个；
    一个第一极耳(2)焊接于第一头部空白集流体(111)，另一个第一极耳(2)焊接于第一尾部空白集流体(112)。
  7. 根据权利要求1-6中任一项所述的卷绕式电芯，其特征在于，卷绕式电芯还包括：第三极耳(6)，焊接于第一极耳(2)的引出到卷绕式电芯外部的一端，且第三极耳(6)的宽度小于第一极耳(2)的宽度，第三极耳(6)的厚度大于第一极耳(2)的厚度。
  8. 根据权利要求1所述的卷绕式电芯，其特征在于，
    第二极片(3)还具有：第二卷绕收尾段(D2)，第二卷绕收尾段(D2)的第二集流体(31)的两面均涂覆第二活性物质层(32)或者只在一面涂覆第二活性物质层(32)或者两面均未涂覆第二活性物质层(32)。
  9. 根据权利要求1所述的卷绕式电芯，其特征在于，第二极耳(4)为两个，相应地，第二极耳收容凹槽(33)为两个。
  10. 根据权利要求1所述的卷绕式电芯，其特征在于，
    卷绕式电芯还包括：第四极耳(7)，焊接于第二极耳(4)的引出到卷绕式电芯外部的一端，且第四极耳(7)的宽度小于第二极耳宽度，第四极耳(7)的厚度大于第二极耳的厚度。
  11. 根据权利要求1所述的卷绕式电芯，其特征在于，第一极耳(2)采用超声波焊接、激光焊接或热压焊接方式电连接于第一头部空白集流体(111)。
  12. 根据权利要求1所述的卷绕式电芯，其特征在于，第二极耳(4)可采用超声波焊接、激光焊接或热压焊接方式电连接于第二极耳收容凹槽(33)处的第二集流体(31)。
  13. 根据权利要求1所述的卷绕式电芯，其特征在于，第二极片(3)还形成有：第二极耳配对凹部(34)，底部为第二集流体(31)而周侧为第二活性物质层(32)，位于第二极耳收容凹槽(33)的正对背侧。
  14. 根据权利要求1所述的卷绕式电芯，其特征在于，所述卷绕式电芯还包括：第一极耳用双面绝缘胶带(T1)，在两面上分别粘接隔离膜(5)和第一极耳(2)。
  15. 根据权利要求1所述的卷绕式电芯，其特征在于，所述卷绕式电芯还包括：第二极耳收容凹槽用双面绝缘胶带(T2)，覆盖整个第二极耳(4)及第二极耳(4)周围的部分第二极耳收容凹槽(33)。
  16. 根据权利要求13所述的卷绕式电芯，其特征在于，所述卷绕式电芯还包括：第二极耳配对凹部用双面绝缘胶带(T3)，覆盖整个第二极耳配对凹部(34)，且在两面上分别粘接隔离膜(5)和第二极耳配对凹部(34)周围的第二活性物质层(32)。
  17. 根据权利要求1-16中任一项所述的卷绕式电芯，其特征在于，第一极片(1)为正极极片而第二极片(3)为负极极片，第一集流体(11)为正极集流体而第二集流体(31)为负极集流体，第一活性物质层(12)为正极活性物质层而第二活性物质层(32)为负极活性物质层；或者
    第一极片(1)为负极极片而第二极片(3)为正极极片，第一集流体(11)为负极集流体而第二集流体(31)为正极集流体，第一活性物质层(12)为负极活性物质层而第二活性物质层(32)为正极活性物质层。
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