WO2016197382A1 - 二次电池电芯 - Google Patents

二次电池电芯 Download PDF

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Publication number
WO2016197382A1
WO2016197382A1 PCT/CN2015/081309 CN2015081309W WO2016197382A1 WO 2016197382 A1 WO2016197382 A1 WO 2016197382A1 CN 2015081309 W CN2015081309 W CN 2015081309W WO 2016197382 A1 WO2016197382 A1 WO 2016197382A1
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WO
WIPO (PCT)
Prior art keywords
cathode
anode
pole piece
current collector
film
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/CN2015/081309
Other languages
English (en)
French (fr)
Inventor
郭培培
何平
赵义
方宏新
程文强
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.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co 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 Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to CN202010514054.5A priority Critical patent/CN111525180B/zh
Priority to CN201580078253.3A priority patent/CN107534127B/zh
Priority to PCT/CN2015/081309 priority patent/WO2016197382A1/zh
Publication of WO2016197382A1 publication Critical patent/WO2016197382A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/72—Grids
    • 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 an electrochemical energy storage device, and more particularly to a secondary battery cell.
  • Lithium-ion batteries (a type of secondary battery) are widely used in various electronic products. As electronic products tend to be smaller and more intelligent, higher requirements are placed on the energy density of lithium-ion batteries.
  • the prior art mainly aims to increase the energy density by forming a groove on the pole piece and welding the tab ear in the groove.
  • a Chinese patent document CN203733894U which is issued on July 23, 2014, discloses a lithium ion battery in which a cathode is provided with a first groove, a second groove is disposed on the anode film, and the cathode tab is welded to the cathode.
  • the anode tab is soldered in the second recess, the upper and lower surfaces of the cathode tab are covered with a first insulating adhesive layer, and the surface of the cathode diaphragm corresponding to the second recess is pasted with a second insulating Adhesive layer.
  • the cathode film adhered by the second insulating layer is prevented because the second insulating layer on the surface of the cathode film cannot prevent the active lithium in the bonded cathode film from being released.
  • the active lithium in the sheet will be diffused by concentration diffusion to the anode pole of the opposite position, but the anode ear of the alignment is the second groove and there is not enough space to embed the above-mentioned free active lithium, so the active lithium will be enriched.
  • the first insulating rubber layer and the second insulating rubber layer are green rubber, and the green rubber is a single-sided insulating rubber layer.
  • the single-sided insulating rubber layer Since the back surface of the single-sided insulating rubber layer is very smooth, the single-sided insulating rubber layer is When the back surface and the separator are in contact with each other, the lithium ion battery is loose in the area where the single-sided insulating layer is adhered. In the battery shaping process and charging and discharging process of the lithium ion battery, the area is raised and becomes the largest. The deformation zone, so the lithium ion battery of this structure still has serious deformation problems.
  • an object of the present invention is to provide a secondary battery cell which, while forming a secondary battery, improves the energy density of the secondary battery.
  • the method can reduce the concentration of the cathode active material in the anode ear during the charging and discharging process, reduce the problem of precipitation of the cathode active material at the anode ear, and improve the safety performance of the secondary battery.
  • the present invention provides a secondary battery cell comprising an anode pole piece, an anode tab, a cathode pole piece, a cathode tab, and a separator.
  • the anode pole piece includes: an anode current collector; and an anode diaphragm disposed on a surface of the anode current collector.
  • the cathode pole piece includes: a cathode current collector; and a cathode diaphragm disposed on a surface of the cathode current collector.
  • the separator is disposed between the anode pole piece and the cathode pole piece.
  • the anode pole piece is formed with: an anode tab receiving groove, the bottom is an anode current collector and the circumference side is an anode diaphragm, and the anode pole is received in the anode tab receiving groove and electrically connected to the anode tab receiving groove Anode current collector.
  • the cathode pole piece is formed with a cathode tab receiving groove, a cathode current collector at the bottom and a cathode diaphragm on the circumference side, and the cathode tab is received in the cathode tab receiving groove and electrically connected to the cathode tab receiving groove.
  • the cathode pole piece is further formed with a cathode pole piece aligning groove, a bottom part is a cathode current collector and a circumference side is a cathode film, and is located at a region of the cathode pole piece opposite to the anode pole receiving groove.
  • the cathode pole piece alignment groove is located in a region of the cathode pole piece opposite to the anode pole receiving groove, and the cathode pole piece alignment groove has no cathode active material. Therefore, when the secondary battery cell forms a secondary battery, the anode tab is accommodated by the anode tab housing recess, and the cathode tab receiving recess receives the cathode tab to increase the energy density of the secondary battery, because the cathode The pole piece alignment groove is aligned with the anode pole, thereby reducing the cathode active material released to the anode pole, thereby reducing the free diffusion of the cathode active material to the aligned anode tab, thereby reducing the secondary battery During the charging and discharging process, the cathode active material is concentrated at the anode tab, which finally reduces the problem of precipitation of the cathode active material at the anode tab and improves the safety performance of the secondary
  • FIG. 1 is a schematic structural view of a secondary battery cell after being wound and formed according to an embodiment of the present invention
  • Figure 2 is a two-dimensional view of the cathode pole piece of the secondary battery cell of Figure 1 in which (a) is a cross-sectional view taken parallel to the direction of the paper of Figure 1, and (b) is a bottom view;
  • Figure 3 is a two-dimensional view of the anode pole piece of the secondary battery cell of Figure 1 in which (a) is a cross-sectional view taken parallel to the direction of the paper of Figure 1, and (b) is a plan view;
  • Figure 4 is an enlarged schematic view of the two dashed box regions of Figure 1, for the sake of clarity, shown in cross-section, wherein (a) is an enlarged schematic view of the right-hand box area indicated by arrow A, and (b) is An enlarged schematic view of the left box area indicated by arrow B;
  • Figure 5 is a block diagram showing the structure of the alternative embodiment of Figure 4.
  • FIG. 6 is a schematic view of a secondary battery cell after winding formation according to another embodiment of the present invention.
  • Figure 7 is an enlarged schematic view of the two dashed box regions of Figure 6, for clarity, shown in cross-section, wherein (a) is an enlarged schematic view of the right boxed area indicated by arrow A, and (b) is An enlarged schematic view of the left box area indicated by arrow B;
  • Figure 8 is a block diagram showing the structure of the alternative embodiment of Figure 7;
  • Figure 9 is a schematic view showing the structure of the prior art.
  • Figure 10 is an enlarged schematic view of the two dashed box regions of Figure 9, for clarity, shown in cross-section, wherein (a) is an enlarged schematic view of the right boxed area indicated by arrow A, and (b) is An enlarged schematic view of the left boxed area indicated by arrow B.
  • the secondary battery cell of the present invention includes an anode pole piece 1, an anode pole 2, a cathode pole piece 3, a cathode tab 4, and a separator 5.
  • the anode pole piece 1 includes an anode current collector 11 and an anode diaphragm 12 disposed on a surface of the anode current collector 11.
  • the cathode pole piece 3 includes a cathode current collector 31, and a cathode diaphragm (containing a cathode active material) 32 disposed on the surface of the cathode current collector 31.
  • the separator 5 is disposed between the anode pole piece 1 and the cathode pole piece 3.
  • the anode pole piece 1 is formed with an anode tab receiving groove G11, an anode current collector 11 at the bottom and an anode diaphragm 12 at the peripheral side.
  • the anode tab 2 is received in the anode tab receiving groove G11 and electrically connected to the anode pole.
  • the ear receives the anode current collector 11 at the groove G11.
  • the cathode pole piece 3 is formed with a cathode tab receiving groove G31, a cathode current collector 31 at the bottom and a cathode diaphragm 32 at the peripheral side.
  • the cathode tab 4 is received in the cathode tab receiving groove G31 and electrically connected to the cathode pole.
  • the ear accommodates the cathode current collector 31 at the groove G31.
  • the cathode pole piece 3 is further formed with a cathode pole piece aligning groove G32, a cathode current collector 31 at the bottom and a cathode film 32 at the periphery, and an area of the cathode pole piece 3 opposite to the anode tab accommodating groove G11. .
  • the cathode pole piece aligning groove G32 is located in a region of the cathode pole piece 3 opposite to the anode tab accommodating groove G11, and the cathode pole piece aligning groove G32 is absent.
  • the cathode active material is present, so after the secondary battery cell forms the secondary battery, the anode tab 2 is accommodated by the anode tab housing groove G11, and the cathode tab receiving groove G31 is accommodated to accommodate the cathode tab 4 to improve the secondary battery.
  • the cathode pole piece alignment groove G32 is aligned with the anode pole 2, the cathode active material released to the anode tab 2 is reduced, and the cathode active material is freely diffused to the opposite anode pole.
  • the cathode active material is enriched in the anode tab 2 during charging and discharging of the secondary battery, thereby finally reducing the problem of precipitation of the cathode active material at the anode tab 2, and improving the safety performance of the secondary battery. .
  • the cathode pole piece alignment groove G32 may be larger in length and width than the anode tab receiving groove G11.
  • the cathode pole piece alignment groove G32 is larger than the anode tab receiving groove G11 by 0.5 to 3 mm in length and width, and is preferably larger than the anode tab receiving groove G11 1 to 2 mm in length and width. .
  • the secondary battery cell in an embodiment, referring to FIG. 1, FIG. 2, FIG. 4, FIG. 5, FIG. 6, FIG. 7, and FIG. 8, the secondary battery cell is further The method may include: a double-sided insulating tape T1 for the cathode pole piece aligning groove, covering the entire cathode pole piece aligning groove G32, and bonding the separator 5 and the cathode around the cathode pole piece aligning groove G32 on both sides respectively Diaphragm 32.
  • the cathode pole piece aligning groove covers the entire cathode pole piece aligning groove G32 with the double-sided insulating tape T1 and the separator 5 and the cathode are respectively bonded on both sides
  • the pole piece aligns the cathode diaphragm 32 around the groove G32, so the bonding area of the cathode pole piece aligning groove with the double-sided insulating tape T1 is closer than that of the single-sided insulating tape, thereby making the whole battery cell of the secondary battery
  • the strength is strengthened, so that the secondary battery cell is prevented from becoming a maximum deformation zone after the shaping process and the secondary battery charge and discharge expansion.
  • the secondary battery cell in an embodiment, referring to FIG. 1, FIG. 2, FIG. 4, FIG. 5, FIG. 6, FIG. 7, and FIG. 8, the secondary battery cell is further The method includes a double-sided insulating tape T2 for covering the cathode tab, covering the entire cathode tab receiving groove G31, and bonding the separator film 5 and the cathode diaphragm 32 around the cathode tab receiving groove G31 on both sides. .
  • the cathode tab receiving groove covers the entire cathode tab receiving groove G31 with the double-sided insulating tape T2 and the separator 5 is bonded on both sides, respectively
  • the cathode tab accommodates the cathode diaphragm 32 around the groove G31, so the bonding area of the cathode tab receiving groove with the double-sided insulating tape T2 is closer than that of the single-sided insulating tape, thereby making the integrity of the secondary battery cell Strengthening, thereby preventing the secondary battery cell from bulging into the maximum deformation zone after the shaping process and the secondary battery charge and discharge expansion.
  • the anode tab 2 may be electrically connected to the anode current collector 11 at the anode tab housing groove G11 by ultrasonic welding, laser welding or thermocompression bonding.
  • the cathode tab 4 may be electrically connected to the cathode current collector 31 at the cathode tab housing groove G31 by ultrasonic welding, laser welding or thermocompression bonding.
  • the anode tab receiving groove G11 may be formed by removing a corresponding portion of the anode film 12 by laser cleaning, mechanical cleaning or styrofoam cleaning to expose the anode current collector 11. Or the anode tab receiving groove G11 may be applied to the anode current collector 11 by pre-setting the heat-sensitive foaming paper before coating the anode film slurry, and then coating and drying the anode film slurry to form an anode film.
  • the foamed slurry which is dried on the anode current collector 11 is formed by drying on the anode current collector 11 and drying and then coating and drying the anode film slurry to form the anode film 12 and drying the anode film slurry.
  • the cathode tab housing recess G31 can remove a corresponding portion of the cathode diaphragm 32 to expose the cathode current collector 31 by laser cleaning, mechanical cleaning or styrofoam cleaning. Forming; or the cathode tab receiving groove G31 can be applied to the cathode current collector 31 by pre-setting the heat-sensitive foaming paper before coating the cathode film slurry, and then coating and drying the cathode film slurry to form a cathode film.
  • the sheet 32 is formed by peeling off the heat-sensitive styrofoam paper from the cathode current collector 31 when the cathode film slurry is dried; or the cathode tab receiving groove G31 can be pre-coated by coating before coating the cathode film slurry
  • the slurry is dried on the cathode current collector 31, and then the cathode film slurry is applied and dried to form the cathode film 32, and the foamed slurry dried at the time of drying the cathode film slurry is peeled off from the cathode current collector 11 .
  • the cathode pole piece alignment groove G32 can be removed by laser cleaning, mechanical cleaning or styrofoam cleaning to expose the corresponding portion of the cathode film 32 to be exposed.
  • the cathode current collector 31 is formed; or the cathode pole piece alignment groove G32 can be coated on the cathode current collector 31 by applying the heat-sensitive styrofoam paper before coating the cathode film slurry, and then drying and drying the cathode film
  • the slurry is formed by forming the cathode film 32 and peeling off the heat-sensitive styrofoam paper from the cathode current collector 31 when the cathode film slurry is dried; or the cathode pole piece aligning groove G32 can pass through the coating cathode film
  • the slurry is pre-coated with the foaming slurry on the cathode current collector 31 and dried, and then the cathode film slurry is coated and dried to form
  • the double-sided insulating tape T1 for the aligning groove of the cathode pole piece may be viscous at the beginning of the double sided or may be viscous at the beginning of one side and the other One side is a double-sided tape that is tacky after subsequent hot or cold pressing.
  • the double-sided insulating tape T2 for the cathode tab accommodating recess may be viscous at the beginning of the double-sided or one-sided initial viscous and another single The surface is a double-sided tape that is tacky after subsequent hot pressing or cold pressing.
  • the cathode pole piece 3 may be further formed with a cathode matching recess R31 and a cathode at the bottom.
  • the current collector 31 and the peripheral side are the cathode diaphragm 32, which are located on the opposite side of the cathode tab accommodation groove G31.
  • the arrangement of the cathode mating recess R31 facilitates ultrasonic welding of the cathode tab 4 into the cathode tab receiving recess G311.
  • the secondary battery cell may further include: a double face for the cathode pairing recess
  • the insulating tape T3 covers the entire cathode mating recess R31, and the separator film 5 and the cathode diaphragm 32 around the cathode mating recess R31 are bonded to the both surfaces, respectively.
  • the cathode counter recess R31 may be formed by removing a corresponding portion of the cathode film 32 to expose the cathode current collector 31 by laser cleaning, mechanical cleaning or styrofoam cleaning; or a cathode
  • the mating recess R31 may be coated on the cathode current collector 31 by coating the cathode film slurry 31 before coating the cathode film paste, and then drying and drying the cathode film slurry to form the cathode film 32 and in the dry cathode film.
  • the heat-sensitive styrofoam paper is peeled off from the cathode current collector 31 in the sheet slurry; or the cathode mating concave portion R31 can be pre-coated with the foaming slurry on the cathode current collector 31 and dried before the cathode film slurry is applied. Then, the cathode film slurry is applied and dried to form the cathode film 32, and the foamed slurry dried at the time of drying the cathode film slurry is peeled off from the cathode current collector 11.
  • the double-sided insulating tape T3 for the cathode mating recess may have a viscosity at the beginning of both sides of the double-sided or one-sided initial viscous and the other single-sided Adhesive double-sided tape after subsequent hot or cold pressing.
  • the anode pole piece 1 may be further formed with an anode mating recess R11 and an anode current collector 11 at the bottom.
  • the peripheral side is the anode diaphragm 12, which is located on the opposite side of the anode tab receiving groove G11.
  • the arrangement of the anode pairing recess R11 facilitates ultrasonic welding of the anode tab 2 in the anode tab receiving groove G11.
  • the cathode pole piece 3 may further be formed with a cathode pole piece aligning recess R32,
  • the bottom is the cathode current collector 31 and the peripheral side is the cathode diaphragm 32, which is located in the region of the cathode pole piece 3 opposite the anode mating recess R11, and is larger in length and width than the anode mating recess R11.
  • the cathode pole piece aligning recess R32 is larger than the anode mating recess R11 by 1 to 2 mm in length and width (ie, the length and the width are respectively 1-2 mm, and the thickness of the cathode diaphragm 32 and the anode diaphragm are the same as the depth. The relationship between the thicknesses of 12 is determined).
  • the cathode pole piece aligning recess R32 is larger in length and width than the anode mating recess R11, and can be adjusted according to actual conditions.
  • the secondary battery cell may further include: a cathode pole piece aligning concave portion
  • the entire cathode pole piece aligning recess R32 is covered with a double-sided insulating tape T4, and the separator film 5 and the cathode diaphragm 32 around the cathode pole piece aligning recess R32 are bonded to both surfaces.
  • the cathode pole piece aligning concave portion covers the entire cathode pole piece aligning concave portion R32 with the double-sided insulating tape T4 and adheres the separator film 5 and the cathode film piece 32 around the cathode pole piece aligning concave portion R32 on both sides, the cathode pole
  • the bonding area of the sheet-aligning concave portion with the double-sided insulating tape T4 is closer than that of the single-sided insulating tape, so that the integrity of the secondary battery cell is strengthened, thereby avoiding the secondary battery cell in the shaping process and the secondary battery charging. After the discharge is expanded, the region is raised to become the largest deformation zone.
  • the anode mating recess R11 may be formed by removing a corresponding portion of the anode film 12 by laser cleaning, mechanical cleaning or styrofoam cleaning to expose the anode current collector 11;
  • the anode pairing recess R11 may be coated on the anode current collector 11 by pre-positioning the heat-sensitive foaming paper before coating the anode film paste, and then drying and drying the anode film slurry to form the anode film 12 and at the dry anode.
  • the heat-sensitive styrofoam paper is peeled off from the anode current collector 11 at the time of the film slurry; or the anode-matching concave portion R11 can be pre-coated with the foaming syrup before the application of the anodic film slurry
  • the foamed slurry which is dried on the anode current collector 11 is formed by drying on the anode current collector 11 and drying and then coating and drying the anode film slurry to form the anode film 12 and drying the anode film slurry.
  • the cathode pole piece aligning recess R32 can be removed by laser cleaning, mechanical cleaning or styrofoam cleaning to expose the cathode current collector 31 to expose the cathode current collector 31.
  • the cathode pole piece aligning recess R32 can be applied to the cathode current collector 31 by pre-setting the heat-sensitive styrofoam paper before coating the cathode film paste, and then coating and drying the cathode film slurry to form a cathode
  • the film 32 is formed by peeling off the heat-sensitive styrofoam paper from the cathode current collector 31 when the cathode film slurry is dried; or the cathode pole piece aligning concave portion R32 can be pre-coated by applying the cathode film paste
  • the foam slurry is dried on the cathode current collector 31, and then the cathode film slurry is applied and dried to form the cathode film 32, and the foamed slurry dried at the time of drying the cathode film slurry is peeled off from the cathode current collector 11. form.
  • the double-sided insulating tape T4 for the eccentric recess of the cathode pole piece may be viscous at the beginning of both sides of the double-sided or one-sided initial viscous and another single
  • the surface is a double-sided tape that is tacky after subsequent hot pressing or cold pressing.
  • the width of the anode tab receiving groove G11 is 1 to 2 times the width of the anode tab 2
  • the anode tab receiving groove G11 is The length is 1 to 3 times the length of the portion of the anode tab 2 housed in the anode tab receiving groove G11, and the depth of the anode tab receiving groove G11 is equal to the thickness of the anode film 12.
  • the width of the cathode tab receiving groove G31 is 1-2 times the width of the cathode tab 4, and the cathode tab receiving groove G31 is The length is 1 to 3 times the length of the portion of the cathode tab 4 housed in the cathode tab receiving groove G31, and the depth of the cathode tab receiving groove G31 is equal to the thickness of the cathode diaphragm 32.
  • the anode pole piece 1 is a unitary piece, and the secondary battery cell is a wound type cell, in the anode pole piece 1 In the unfolded state, the distance from the head to the tail of the anode pole piece 1 is defined as D1, and the distance between the center line of the anode tab receiving groove G11 to the head of the anode pole piece 1 is defined as d1, and d1 is in the self-anode
  • the head of the sheet 1 is in the range of 1/10D1 to 7/10D1 calculated, which is advantageous in reducing the DC resistance (Direct Current Resistance) of the secondary battery cell.
  • d1 is in the range of 3/10D1 to 7/10D1 calculated from the head of the anode pole piece 1. Further, the closer d1 is to the middle position of the anode pole piece 1 Set (ie 1/2D1), the smaller the DCR.
  • the anode current collector 11 is provided with the anode film 12 on only one surface near the head of the anode pole piece 1.
  • the cathode pole piece 3 is a unitary piece, and the secondary battery cell is a wound cell, and the cathode pole piece 3 is In the unfolded state, the distance from the head to the tail of the cathode pole piece 3 is defined as D2, the distance between the center line of the cathode tab receiving groove G31 to the head of the cathode pole piece 3 is defined as d2, and d2 is at the self-cathode
  • the head of the sheet 3 is in the range of 1/10D2 to 7/10D2 calculated, thereby contributing to lowering the DC resistance DCR of the secondary battery cell.
  • d2 is in the range of 3/10D2 to 7/10D2 calculated from the head of the cathode pole piece 3. Further, the closer to the intermediate position of the cathode pole piece 3 (i.e., 1/2D2), the smaller the DCR.
  • the double-sided tape includes a substrate and a glue layer coated on both 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.
  • the adhesive is already present on one side of the single side and the other side is the double-sided tape which is tacky after the subsequent hot pressing or cold pressing, a single-sided initial
  • the viscous adhesive layer may be a styrene-butadiene rubber layer, a polyurethane layer, a polyacrylate layer or a polyvinylidene fluoride layer; and the other single side may be a viscous adhesive layer after subsequent hot pressing or cold pressing.
  • the temperature-sensitive adhesive having no initial tack at normal temperature refers to a temperature-sensitive adhesive which does not cause adhesion to an object when a short-term contact occurs between the object and the temperature-sensitive adhesive at a normal temperature.
  • the pressure-sensitive adhesive having no initial tack at normal temperature refers to a pressure-sensitive adhesive which does not cause adhesion to an object when the object and the pressure-sensitive adhesive are temporarily contacted under a finger pressure at a normal temperature.
  • the temperature-sensitive adhesive having no initial tack at normal temperature may be selected from one or more of polyolefin, polyvinyl butyral, polyamide, and polyester.
  • the pressure sensitive adhesive having no initial tack at normal temperature may be selected from the group consisting of ethylene-butylene-polystyrene linear triblock copolymer (SEBS), styrene-butadiene block copolymer (SEPS), and epoxidized benzene.
  • SEBS ethylene-butylene-polystyrene linear triblock copolymer
  • SEPS styrene-butadiene block copolymer
  • ESIS ethylene-isoprene-styrene block copolymers
  • the secondary battery may be a lithium ion battery or a sodium ion battery.
  • the cathode active material contains lithium.
  • the cathode active material contains sodium.
  • the secondary battery may be a flexible packaging secondary battery.
  • the 423482 model flexible packaging lithium ion battery (the finished battery thickness is 4.2mm, the width is 34mm, the length is 82mm), the anode tab 2 and the cathode tab 4 are the same size, that is, the welding length of the tab is 15mm, the width of the tab is It is 4 mm and has a thickness of 0.06 mm.
  • the cathode pole piece region of the two alignment positions cleans the cathode pole piece alignment groove G32 and the cathode pole piece alignment concave portion R32.
  • the cathode tab receiving groove G31 and the cathode mating recess R31 each have a width of 6 mm and a length of 20 mm
  • the anode tab receiving groove G11 and the anode mating recess R11 each have a width of 6 mm and a length of 20 mm
  • the alignment groove G32 and the cathode pole piece aligning recess R32 have a width of 8 mm and a length of 22 mm, and the anode tab 2 is welded to the anode tab receiving groove G11, and the cathode tab 4 is soldered to the cathode tab.
  • the cathode pole piece aligning groove covers the entire cathode pole piece aligning groove G32 with the double-sided edge tape T1 and adheres the separator film 5 and the cathode film 32 around the cathode pole piece aligning groove G32 on both sides
  • the tab housing recess covers the entire cathode tab receiving recess G31 with double-sided insulating tape T2 and adheres the separator film 5 and the cathode diaphragm 32 around the cathode tab receiving recess G31 on both sides
  • the cathode mating recess is double
  • the surface insulating tape T3 covers the entire cathode mating recess R31 and adheres the separator film 5 and the cathode diaphragm 32 around the cathode mating recess R31 on both sides
  • the cathode pole piece aligning recess covers the entire cathode pole piece with the double-sided insulating tape T4.
  • the recessed portion R32 is bonded to the cathode film 32 around the isolation film 5 and the cathode pole piece aligning concave portion R32 on both sides, and the double-sided insulating tape T1 for the cathode pole piece aligning groove and the double-shaped cathode accommodating groove for the cathode pole piece Double-sided insulating tape T2, double-sided insulating tape T3 for cathode matching recess, double-sided insulating tape T4 for aligning concave portion of cathode pole piece, double-coated polyvinylidene fluoride on PET substrate which is viscous on both sides at the beginning Double-sided tape of the layer, anode pole piece 1 Cathode plate 3 and the insulating film 5 is wound, thereby forming a secondary battery cell.
  • the structure shown in FIG. 5 differs from the first embodiment in that there is no cathode matching recess R31, a double-sided insulating tape T3 for the cathode mating recess, an anode mating recess R11, a cathode pole piece aligning recess R32, and a cathode pole piece pair.
  • the double recessed insulating tape T4 is used for the recess. The rest are the same as in the first embodiment.
  • Single-sided setting cleaning the anode tab receiving groove G11 for welding the anode tab 2, and cleaning the cathode pole piece registration groove G32 in the cathode pole piece region where the anode tab 2 is aligned, and the cathode pole piece is aligned
  • the groove covers the entire cathode pole piece aligning groove G32 with a double-sided edge tape T1 and adheres the separator film 5 and the cathode film 32 around the cathode pole piece aligning groove G32 on both sides. The rest are the same as in the first embodiment.
  • the structure shown in FIG. 8 is different from that of Embodiment 4: the anode tab receiving groove G11 has a width of 6 mm and a length of 20 mm, and the cathode pole piece aligning groove G32 has a width of 4 mm and a length of both. 18mm. The rest is the same as in the fourth embodiment.
  • FIG. 9 and FIG. 10 The structure shown in FIG. 9 and FIG. 10 is different from the embodiment 1 in that there is no cathode pole piece alignment groove G32 and cathode pole piece alignment concave portion R32, but the cathode pole piece alignment receiving area is used for one side.
  • the insulating tape T1' is pasted on the surface of the corresponding region of the cathode diaphragm 32 opposite to the anode tab receiving groove G11, and the anode matching recess of the cathode diaphragm 32 is adhered by the single-sided insulating tape T4' of the cathode pole piece alignment pair region.
  • the surface of the corresponding region of the R11 alignment is bonded to the cathode diaphragm 32 around the cathode tab receiving groove G31 by the single-sided insulating tape T2' of the cathode tab receiving groove, and the single-sided insulating tape T3' is pasted by the cathode matching recess.
  • the cathode is matched to the cathode diaphragm 32 around the recess R31.
  • Example 1-2 20 soft-package lithium-ion battery samples were selected for 1000 cycles of charge and discharge tests, and the thickness of the samples before and after the test was measured, and the tested soft-package lithium-ion battery samples were tested. The lithium was disassembled and observed, and the results are shown in Table 1.
  • the cathode pole piece aligning groove G32 is larger than the anode tab accommodating groove G11 in length and width, can completely prevent lithium deposition, and can effectively control the deformation of the flexible package lithium ion battery. .
  • the cathode pole piece alignment groove G32 is smaller in length and width than the anode tab receiving groove G11, which can reduce lithium deposition and reduce the amount of deformation.

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Abstract

本发明提供了一种二次电池电芯，其包括阳极极片、阳极极耳、阴极极片、阴极极耳以及隔离膜。阳极极片包括阳极集流体以及阳极膜片。阴极极片包括阴极集流体以及阴极膜片。隔离膜设置于阳极极片和阴极极片之间。阳极极片形成有：阳极极耳收容凹槽，底部为阳极集流体而周侧为阳极膜片，阳极极耳收容于阳极极耳收容凹槽内并电连接于阳极极耳收容凹槽处的阳极集流体。阴极极片形成有：阴极极耳收容凹槽，底部为阴极集流体而周侧为阴极膜片，阴极极耳收容于阴极极耳收容凹槽内并电连接于阴极极耳收容凹槽处的阴极集流体。阴极极片还形成有：阴极极片对位凹槽，底部为阴极集流体而周侧为阴极膜片，位于阴极极片的与阳极极耳收容凹槽对位的区域。

Description

二次电池电芯 技术领域
本发明涉及电化学储能装置，尤其涉及一种二次电池电芯。
背景技术
锂离子电池(为二次电池的一种)在各类电子产品中均有广泛的应用。随着电子产品趋向小型化、智能化，对锂离子电池的能量密度提出了更高的要求。现有技术主要是通过在极片上开设凹槽，将极耳焊接在凹槽内，从而达到提升能量密度的目的。
于2014年7月23日授权公告的中国专利文献CN203733894U公开了一种锂离子电池，其中阴极膜片上设置有第一凹槽，阳极膜片上设置有第二凹槽，阴极极耳焊接于第一凹槽内，阳极极耳焊接于第二凹槽内，阴极极耳的上下两个表面上覆盖有第一绝缘胶层，第二凹槽对应的阴极膜片的表面贴有第二绝缘胶层。然而，在充放电循环过程中，由于阴极膜片的表面上的第二绝缘胶层无法阻止被粘盖的阴极膜片中的活性锂游离出来，因此被第二绝缘胶层粘盖的阴极膜片中的活性锂将通过浓差扩散游离至对位的阳极极耳处，但对位的阳极极耳为第二凹槽而无足够空间镶嵌上述游离出的活性锂，因此活性锂将富集在阳极极耳处，使得阳极极耳处出现严重的析锂问题。同时，在该专利文献中，第一绝缘胶层和第二绝缘胶层为绿胶，绿胶为单面绝缘胶层，由于单面绝缘胶层的背面非常光滑，使得单面绝缘胶层的背面和隔离膜接触时不能粘附在一起，造成锂离子电池在粘贴了单面绝缘胶层的区域比较疏松，在锂离子电池的电芯整形工序及充放电过程中，该区域隆起而成为最大变形区，因此该结构的锂离子电池还存在着严重的变形问题。
发明内容
鉴于现有技术中存在的问题，本发明的目的在于提供一种二次电池电芯，当二次电池电芯形成二次电池后，在提高二次电池的能量密度的同时， 能减轻二次电池在充放电过程中阴极活性物质富集在阳极极耳处，减轻阳极极耳处出现析出阴极活性物质的问题，提高二次电池的安全性能。
为了实现上述目的，本发明提供了一种二次电池电芯，其包括阳极极片、阳极极耳、阴极极片、阴极极耳以及隔离膜。
阳极极片包括：阳极集流体；以及阳极膜片，设置在阳极集流体的表面。阴极极片包括：阴极集流体；以及阴极膜片，设置在阴极集流体的表面。隔离膜设置于阳极极片和阴极极片之间。阳极极片形成有：阳极极耳收容凹槽，底部为阳极集流体而周侧为阳极膜片，阳极极耳收容于阳极极耳收容凹槽内并电连接于阳极极耳收容凹槽处的阳极集流体。阴极极片形成有：阴极极耳收容凹槽，底部为阴极集流体而周侧为阴极膜片，阴极极耳收容于阴极极耳收容凹槽内并电连接于阴极极耳收容凹槽处的阴极集流体。阴极极片还形成有：阴极极片对位凹槽，底部为阴极集流体而周侧为阴极膜片，位于阴极极片的与阳极极耳收容凹槽对位的区域。
本发明的有益效果如下:
在根据本发明所述的二次电池电芯中，阴极极片对位凹槽位于阴极极片的与阳极极耳收容凹槽对位的区域，阴极极片对位凹槽无阴极活性物质存在，所以当二次电池电芯形成二次电池后，在利用阳极极耳收容凹槽收容阳极极耳、阴极极耳收容凹槽收容阴极极耳来提高二次电池的能量密度的同时，因为阴极极片对位凹槽与阳极极耳对位，从而减少了向阳极极耳游离的阴极活性物质，从而减少了阴极活性物质游离扩散至对位的阳极极耳处，进而能减轻在二次电池充放电过程中阴极活性物质富集在阳极极耳处，最终减轻了阳极极耳处出现析出阴极活性物质的问题，提高二次电池的安全性能。
附图说明
图1是根据本发明的一实施例的二次电池电芯卷绕成型后的结构示意图；
图2是图1的二次电池电芯的阴极极片展开后的两个视图，其中(a)为平行于图1的纸面方向做出的剖视图，而(b)为仰视图；
图3是图1的二次电池电芯的阳极极片展开后的两个视图，其中(a)为平行于图1的纸面方向做出的剖视图，而(b)为俯视图；
图4是图1的两个虚线方框区域的放大示意图，为了清楚起见，以剖视图方式示出，其中(a)为由箭头A指示的右侧方框区域的放大示意图，而(b)为由箭头B指示的左侧方框区域的放大示意图；
图5示出了图4的替代实施例的结构示意图；
图6是根据本发明另一实施例的二次电池电芯卷绕成型后的示意图；
图7是图6的两个虚线方框区域的放大示意图，为了清楚起见，以剖视图方式示出，其中(a)为由箭头A指示的右侧方框区域的放大示意图，而(b)为由箭头B指示的左侧方框区域的放大示意图；
图8示出了图7的替代实施例的结构示意图；
图9示出了现有技术的结构示意图；
图10是图9的两个虚线方框区域的放大示意图，为了清楚起见，以剖视图方式示出，其中(a)为由箭头A指示的右侧方框区域的放大示意图，而(b)为由箭头B指示的左侧方框区域的放大示意图。
其中，附图标记说明如下：
1阳极极片
11阳极集流体
12阳极膜片
G11阳极极耳收容凹槽
R11阳极配对凹部
2阳极极耳
3阴极极片
31阴极集流体
32阴极膜片
G31阴极极耳收容凹槽
G32阴极极片对位凹槽
R31阴极配对凹部
R32阴极极片对位凹部
4阴极极耳
5隔离膜
T1阴极极片对位凹槽用双面绝缘胶带
T2阴极极耳收容凹槽用双面绝缘胶带
T3阴极配对凹部用双面绝缘胶带
T4阴极极片对位凹部用双面绝缘胶带
T1'阴极极片对位收容区用单面绝缘胶带
T2'阴极极耳收容凹槽用单面绝缘胶带
T3'阴极配对凹部用单面绝缘胶带
T4'阴极极片对位配对区用单面绝缘胶带
具体实施方式
下面参照附图来详细说明根据本发明的二次电池电芯以及实施例和对比例的测试结果。
首先说明根据本发明的二次电池电芯。
参照图1至图8，本发明的二次电池电芯包括阳极极片1、阳极极耳2、阴极极片3、阴极极耳4以及隔离膜5。
阳极极片1包括：阳极集流体11；以及阳极膜片12，设置在阳极集流体11的表面。阴极极片3包括：阴极集流体31；以及阴极膜片(含有阴极活性物质)32，设置在阴极集流体31的表面。隔离膜5设置于阳极极片1和阴极极片3之间。
阳极极片1形成有：阳极极耳收容凹槽G11，底部为阳极集流体11而周侧为阳极膜片12，阳极极耳2收容于阳极极耳收容凹槽G11内并电连接于阳极极耳收容凹槽G11处的阳极集流体11。
阴极极片3形成有：阴极极耳收容凹槽G31，底部为阴极集流体31而周侧为阴极膜片32，阴极极耳4收容于阴极极耳收容凹槽G31内并电连接于阴极极耳收容凹槽G31处的阴极集流体31。
阴极极片3还形成有：阴极极片对位凹槽G32，底部为阴极集流体31而周侧为阴极膜片32，位于阴极极片3的与阳极极耳收容凹槽G11对位的区域。
在根据本发明所述的二次电池电芯中，阴极极片对位凹槽G32位于阴极极片3的与阳极极耳收容凹槽G11对位的区域，阴极极片对位凹槽G32无 阴极活性物质存在，所以当二次电池电芯形成二次电池后，在利用阳极极耳收容凹槽G11收容阳极极耳2、阴极极耳收容凹槽G31收容阴极极耳4来提高二次电池的能量密度的同时，因为阴极极片对位凹槽G32与阳极极耳2对位，从而减少了向阳极极耳2游离的阴极活性物质，减少了阴极活性物质游离扩散至对位的阳极极耳2处，进而能减轻在二次电池充放电过程中阴极活性物质富集在阳极极耳2处，最终减轻了阳极极耳2处出现析出阴极活性物质的问题，提高二次电池的安全性能。
在根据本发明所述的二次电池电芯中，在实施例中，阴极极片对位凹槽G32在长度和宽度上均可大于阳极极耳收容凹槽G11。在一实施例中，阴极极片对位凹槽G32在长度和宽度上均大于阳极极耳收容凹槽G11 0.5～3mm，优选在长度和宽度上均大于阳极极耳收容凹槽G11 1～2mm。在这种情况下，能够完全避免在二次电池充放电过程中阴极活性物质富集在阳极极耳2处，最终完全克服阳极极耳2处出现析出阴极活性物质的问题，进一步提高二次电池的安全性能。
在根据本发明所述的二次电池电芯中，在一实施例中，参照图1、图2、图4、图5、图6、图7以及图8，所述二次电池电芯还可包括：阴极极片对位凹槽用双面绝缘胶带T1，覆盖整个阴极极片对位凹槽G32，且在两面上分别粘接隔离膜5和阴极极片对位凹槽G32周围的阴极膜片32。
在根据本发明所述的二次电池电芯中，由于阴极极片对位凹槽用双面绝缘胶带T1覆盖整个阴极极片对位凹槽G32且在两面上分别粘接隔离膜5和阴极极片对位凹槽G32周围的阴极膜片32，所以阴极极片对位凹槽用双面绝缘胶带T1粘接区域比采用单面绝缘胶带时更紧密，从而使得二次电池电芯的整体性加强，从而避免二次电池电芯在整形工序以及二次电池充放电膨胀后该区域隆起成为最大变形区。
在根据本发明所述的二次电池电芯中，在一实施例中，参照图1、图2、图4、图5、图6、图7以及图8，所述二次电池电芯还可包括：阴极极耳收容凹槽用双面绝缘胶带T2，覆盖整个阴极极耳收容凹槽G31，且在两面上分别粘接隔离膜5和阴极极耳收容凹槽G31周围的阴极膜片32。
在根据本发明所述的二次电池电芯中，由于阴极极耳收容凹槽用双面绝缘胶带T2覆盖整个阴极极耳收容凹槽G31且在两面上分别粘接隔离膜5和 阴极极耳收容凹槽G31周围的阴极膜片32，所以阴极极耳收容凹槽用双面绝缘胶带T2粘接区域比采用单面绝缘胶带时更紧密，从而使得二次电池电芯的整体性加强，从而避免二次电池电芯在整形工序以及二次电池充放电膨胀后该区域隆起成为最大变形区。
在根据本发明所述的二次电池电芯中，阳极极耳2可采用超声波焊接、激光焊接或热压焊接方式电连接于阳极极耳收容凹槽G11处的阳极集流体11。
在根据本发明所述的二次电池电芯中，阴极极耳4可采用超声波焊接、激光焊接或热压焊接方式电连接于阴极极耳收容凹槽G31处的阴极集流体31。
在根据本发明所述的二次电池电芯中，阳极极耳收容凹槽G11可通过激光清洗、机械清洗或发泡胶清洗将阳极膜片12的对应部分去除以露出阳极集流体11而形成；或者阳极极耳收容凹槽G11可通过涂布阳极膜片浆料之前预置热敏型发泡胶纸在阳极集流体11上、之后涂布并干燥阳极膜片浆料以形成阳极膜片12且在干燥阳极膜片浆料时热敏型发泡胶纸从阳极集流体11上剥离形成；或者阳极极耳收容凹槽G11可通过在涂布阳极膜片浆料之前预涂发泡浆料在阳极集流体11上并干燥、之后涂布并干燥阳极膜片浆料以形成阳极膜片12且在干燥阳极膜片浆料时干燥的发泡浆料从阳极集流体11上剥离形成。
在根据本发明所述的二次电池电芯中，阴极极耳收容凹槽G31可通过激光清洗、机械清洗或发泡胶清洗将阴极膜片32的的对应部分去除以露出阴极集流体31而形成；或者阴极极耳收容凹槽G31可通过涂布阴极膜片浆料之前预置热敏型发泡胶纸在阴极集流体31上、之后涂布并干燥阴极膜片浆料以形成阴极膜片32且在干燥阴极膜片浆料时热敏型发泡胶纸从阴极集流体31上剥离形成；或者阴极极耳收容凹槽G31可通过在涂布阴极膜片浆料之前预涂发泡浆料在阴极集流体31上并干燥、之后涂布并干燥阴极膜片浆料以形成阴极膜片32且在干燥阴极膜片浆料时干燥的发泡浆料从阴极集流体11上剥离形成。
在根据本发明所述的二次电池电芯中，阴极极片对位凹槽G32可通过激光清洗、机械清洗或发泡胶清洗而将阴极膜片32的的对应部分去除以露出 阴极集流体31而形成；或者阴极极片对位凹槽G32可通过涂布阴极膜片浆料之前预置热敏型发泡胶纸在阴极集流体31上、之后涂布并干燥阴极膜片浆料以形成阴极膜片32且在干燥阴极膜片浆料时热敏型发泡胶纸从阴极集流体31上剥离形成；或者阴极极片对位凹槽G32可通过在涂布阴极膜片浆料之前预涂发泡浆料在阴极集流体31上并干燥、之后涂布并干燥阴极膜片浆料以形成阴极膜片32且在干燥阴极膜片浆料时干燥的发泡浆料从阴极集流体11上剥离形成。
在根据本发明所述的二次电池电芯中，阴极极片对位凹槽用双面绝缘胶带T1可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。
在根据本发明所述的二次电池电芯中，阴极极耳收容凹槽用双面绝缘胶带T2可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。
在根据本发明所述的二次电池电芯中，在一实施例中，参照图1、图4、图6以及图7，阴极极片3还可形成有：阴极配对凹部R31，底部为阴极集流体31而周侧为阴极膜片32，位于阴极极耳收容凹槽G31的正对背侧。阴极配对凹部R31的设置，便于阴极极耳4超声焊接于阴极极耳收容凹槽G311中。
在根据本发明所述的二次电池电芯中，在一实施例中，参照图1、图4、图6以及图7，所述二次电池电芯还可包括：阴极配对凹部用双面绝缘胶带T3，覆盖整个阴极配对凹部R31，且在两面上分别粘接隔离膜5和阴极配对凹部R31周围的阴极膜片32。
在根据本发明所述的二次电池电芯中，阴极配对凹部R31可通过激光清洗、机械清洗或发泡胶清洗将阴极膜片32的对应部分去除以露出阴极集流体31而形成；或者阴极配对凹部R31可通过涂布阴极膜片浆料之前预置热敏型发泡胶纸在阴极集流体31上、之后涂布并干燥阴极膜片浆料以形成阴极膜片32且在干燥阴极膜片浆料时热敏型发泡胶纸从阴极集流体31上剥离形成；或者阴极配对凹部R31可通过在涂布阴极膜片浆料之前预涂发泡浆料在阴极集流体31上并干燥、之后涂布并干燥阴极膜片浆料以形成阴极膜片32且在干燥阴极膜片浆料时干燥的发泡浆料从阴极集流体11上剥离形成。
在根据本发明所述的二次电池电芯中，阴极配对凹部用双面绝缘胶带T3可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。
在根据本发明所述的二次电池电芯中，在一实施例中，参照图1、图3以及图4，阳极极片1还可形成有：阳极配对凹部R11，底部为阳极集流体11而周侧为阳极膜片12，位于阳极极耳收容凹槽G11的正对背侧。阳极配对凹部R11的设置，便于阳极极耳2超声焊接于阳极极耳收容凹槽G11中。
在根据本发明所述的二次电池电芯中，在一实施例中，参照图1、图2、图3以及图4，阴极极片3还可形成有：阴极极片对位凹部R32，底部为阴极集流体31而周侧为阴极膜片32，位于阴极极片3的与阳极配对凹部R11对位的区域，且在长度和宽度上均大于阳极配对凹部R11。优选地，阴极极片对位凹部R32在长度和宽度上均大于阳极配对凹部R11 1～2mm(即长度和宽度分别大1～2mm，至于深度是否相同可以阴极膜片32的厚度与阳极膜片12的厚度之间的关系来确定)。当然，阴极极片对位凹部R32在长度和宽度上均大于阳极配对凹部R11的数值可以视实际情况来调整。
在根据本发明所述的二次电池电芯中，在一实施例中，参照图1、图2、图3以及图4，所述二次电池电芯还可包括：阴极极片对位凹部用双面绝缘胶带T4，覆盖整个阴极极片对位凹部R32，且在两面上分别粘接隔离膜5和阴极极片对位凹部R32周围的阴极膜片32。由于阴极极片对位凹部用双面绝缘胶带T4覆盖整个阴极极片对位凹部R32且在两面上分别粘接隔离膜5和阴极极片对位凹部R32周围的阴极膜片32，所以阴极极片对位凹部用双面绝缘胶带T4粘接区域比采用单面绝缘胶带时更紧密，从而使得二次电池电芯的整体性加强，从而避免二次电池电芯在整形工序以及二次电池充放电膨胀后该区域隆起成为最大变形区。
在根据本发明所述的二次电池电芯中，阳极配对凹部R11可通过激光清洗、机械清洗或发泡胶清洗将阳极膜片12的对应部分去去除以露出阳极集流体11而形成；或者阳极配对凹部R11可通过涂布阳极膜片浆料之前预置热敏型发泡胶纸在阳极集流体11上、之后涂布并干燥阳极膜片浆料以形成阳极膜片12且在干燥阳极膜片浆料时热敏型发泡胶纸从阳极集流体11上剥离形成；或者阳极配对凹部R11可通过在涂布阳极膜片浆料之前预涂发泡浆 料在阳极集流体11上并干燥、之后涂布并干燥阳极膜片浆料以形成阳极膜片12且在干燥阳极膜片浆料时干燥的发泡浆料从阳极集流体11上剥离形成。
在根据本发明所述的二次电池电芯中，阴极极片对位凹部R32可通过激光清洗、机械清洗或发泡胶清洗将阴极膜片32的的对应部分去去除以露出阴极集流体31而形成；或者阴极极片对位凹部R32可通过涂布阴极膜片浆料之前预置热敏型发泡胶纸在阴极集流体31上、之后涂布并干燥阴极膜片浆料以形成阴极膜片32且在干燥阴极膜片浆料时热敏型发泡胶纸从阴极集流体31上剥离形成；或者阴极极片对位凹部R32可通过在涂布阴极膜片浆料之前预涂发泡浆料在阴极集流体31上并干燥、之后涂布并干燥阴极膜片浆料以形成阴极膜片32且在干燥阴极膜片浆料时干燥的发泡浆料从阴极集流体11上剥离形成。
在根据本发明所述的二次电池电芯中，阴极极片对位凹部用双面绝缘胶带T4可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。
在根据本发明所述的二次电池电芯中，在一实施例中，阳极极耳收容凹槽G11的宽度为阳极极耳2的宽度的1～2倍，阳极极耳收容凹槽G11的长度为阳极极耳2的收容于阳极极耳收容凹槽G11内的部分的长度的1～3倍，阳极极耳收容凹槽G11的深度等于阳极膜片12的厚度。
在根据本发明所述的二次电池电芯中，在一实施例中，阴极极耳收容凹槽G31的宽度为阴极极耳4的宽度的1～2倍，阴极极耳收容凹槽G31的长度为阴极极耳4的收容于阴极极耳收容凹槽G31内的部分的长度的1～3倍，阴极极耳收容凹槽G31的深度等于阴极膜片32的厚度。
在根据本发明所述的二次电池电芯中，在一实施例中，参照图3，阳极极片1为一整体片，二次电池电芯为卷绕式电芯，在阳极极片1展开状态下，阳极极片1的头部至尾部的距离定义为D1，阳极极耳收容凹槽G11的中心线至阳极极片1的头部之间的距离定义为d1，d1处于自阳极极片1的头部起计算的1/10D1～7/10D1的范围内，从而有利于降低二次电池电芯的直流阻抗DCR(Direct current resistance)。优选地，d1处于自阳极极片1的头部起计算的3/10D1～7/10D1的范围内。进一步地，d1越靠近阳极极片1的中间位 置(即1/2D1)，DCR越小。
在根据本发明所述的二次电池电芯中，在一实施例中，参照图3，阳极集流体11位于阳极极片1的头部附近处仅一个表面设置阳极膜片12。
在根据本发明所述的二次电池电芯中，在一实施例中，参照图2，阴极极片3为一整体片，二次电池电芯为卷绕式电芯，在阴极极片3展开状态下，阴极极片3的头部至尾部的距离定义为D2，阴极极耳收容凹槽G31的中心线至阴极极片3的头部之间的距离定义为d2，d2处于自阴极极片3的头部起计算的1/10D2～7/10D2的范围内，从而有利于降低二次电池电芯的直流阻抗DCR。优选地，d2处于自阴极极片3的头部起计算的3/10D2～7/10D2的范围内。进一步地，越靠近阴极极片3的中间位置(即1/2D2)，DCR越小。
在根据本发明所述的二次电池电芯中，双面胶带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。
在根据本发明所述的二次电池电芯中，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。所述常温下无初粘性的温敏胶是指在常温下，当物体和温敏胶之间发生短暂接触时，不会对物体产生粘结作用的温敏胶。所述常温下无初粘性的压敏胶是指在常温下，当物体和压敏胶之间在指压下发生短暂接触时，不会对物体产生粘结作用的压敏胶。所述常温下无初粘性的温敏胶可选自聚烯烃、聚乙烯醇缩丁醛、聚酰胺类以及聚酯类中的一种或几种。所述常温下无初粘性的压敏胶可选自乙烯-丁烯-聚苯乙烯线性三嵌段共聚物(SEBS)、苯乙烯-丁二烯嵌段共聚物(SEPS)以及环氧化苯乙烯-异戊二烯-苯乙烯嵌段共聚物(ESIS)中的一种或几种。
在根据本发明的二次电池电芯中，二次电池可为锂离子电池或钠离子电池。当采用锂离子电池时，阴极活性物质含锂。当采用钠离子电池时，阴极活性物质含钠。所述二次电池可为软包装二次电池。
最后说明根据本发明的以软包装锂离子电池作为举例的实施例和对比 例及测试结果。
实施例1
以423482型号软包装锂离子电池(成品电池厚度为4.2mm、宽度为34mm、长度为82mm)为例，阳极极耳2与阴极极耳4尺寸一致，即极耳的焊接长度为15mm，极耳宽度为4mm、厚度为0.06mm。
采用图1～4所示的结构，经冷压工序后的极片(阳极极片1的单层阳极膜片12的厚度为67μm、阴极极片3的单层阴极膜片32的厚度为53μm)，采用激光在阳极极片1的1/2处(即d1＝1/2D1)清洗出用于焊接阳极极耳2的阳极极耳收容凹槽G11以及阳极配对凹部R11，并在阳极极耳2对位的阴极极片区清洗出阴极极片对位凹槽G32以及阴极极片对位凹部R32。采用激光在阴极极片3的1/2处(即d2＝1/2D2)清洗出用于焊接阴极极耳4的阴极极耳收容凹槽G31以及阴极配对凹部R31。其中阴极极耳收容凹槽G31以及阴极配对凹部R31各自宽度均为6mm、长度均为20mm，阳极极耳收容凹槽G11以及阳极配对凹部R11各自宽度均为6mm、长度均为20mm，阴极极片对位凹槽G32以及阴极极片对位凹部R32各自宽度均为8mm、长度均为22mm，将阳极极耳2焊接于阳极极耳收容凹槽G11、将阴极极耳4焊接于阴极极耳收容凹槽G31。阴极极片对位凹槽用双面缘胶带T1覆盖整个阴极极片对位凹槽G32且在两面上分别粘接隔离膜5和阴极极片对位凹槽G32周围的阴极膜片32，阴极极耳收容凹槽用双面绝缘胶带T2覆盖整个阴极极耳收容凹槽G31且在两面上分别粘接隔离膜5和阴极极耳收容凹槽G31周围的阴极膜片32，阴极配对凹部用双面绝缘胶带T3覆盖整个阴极配对凹部R31且在两面上分别粘接隔离膜5和阴极配对凹部R31周围的阴极膜片32，阴极极片对位凹部用双面绝缘胶带T4覆盖整个阴极极片对位凹部R32且在两面上分别粘接隔离膜5和阴极极片对位凹部R32周围的阴极膜片32，阴极极片对位凹槽用双面绝缘胶带T1、阴极极耳收容凹槽用双面绝缘胶带T2、阴极配对凹部用双面绝缘胶带T3、阴极极片对位凹部用双面绝缘胶带T4均为双面初始时均已有粘性的PET基材上双面涂覆聚偏氟乙烯层的双面胶带，阳极极片1、阴极极片3和隔离膜5卷绕，由此形成二次电池电芯。
实施例2
采用图5所示的结构，与实施例1的不同之处：无阴极配对凹部R31、阴极配对凹部用双面绝缘胶带T3、阳极配对凹部R11、阴极极片对位凹部R32以及阴极极片对位凹部用双面绝缘胶带T4。其余同实施例1。
实施例3
采用图6和图7所示的结构，与实施例1的不同之处：采用激光方式在阳极极片1的3/4处(即d1＝3/4D1，靠近头部附近的阳极膜片12单面设置)清洗出用于焊接阳极极耳2的阳极极耳收容凹槽G11，并在阳极极耳2对位的阴极极片区清洗出阴极极片对位凹槽G32，阴极极片对位凹槽用双面缘胶带T1覆盖整个阴极极片对位凹槽G32且在两面上分别粘接隔离膜5和阴极极片对位凹槽G32周围的阴极膜片32。其余同实施例1。
实施例4
采用如图8所示的结构，与实施例3的不同之处：无阴极配对凹部R31以及阴极配对凹部用双面绝缘胶带T3。其余同实施例3。
对比例1
采用如图8所示结构，与实施例4的不同之处：阳极极耳收容凹槽G11的宽度为6mm、长度均为20mm，阴极极片对位凹槽G32的宽度为4mm、长度均为18mm。其余同实施例4。
对比例2
采用图9和图10所示的结构，与实施例1的不同之处：无阴极极片对位凹槽G32和阴极极片对位凹部R32，但采用阴极极片对位收容区用单面绝缘胶带T1'粘贴阴极膜片32的与阳极极耳收容凹槽G11对位的相应区域的表面，采用阴极极片对位配对区用单面绝缘胶带T4'粘贴阴极膜片32的阳极配对凹部R11对位的相应区域的表面，采用阴极极耳收容凹槽用单面绝缘胶带T2'粘贴阴极极耳收容凹槽G31周围的阴极膜片32，采用阴极配对凹部用单面绝缘胶带T3'粘贴阴极配对凹部R31周围的阴极膜片32。
在实施例1-4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。
表1 实施例1-4与对比例1-2的测试结果
Figure PCTCN2015081309-appb-000001
从表1看出，实施例1-4无析锂；而对比例1和对比例2有析锂，且对比例2比对比例1析锂严重；实施例1-4的变形量远小于对比例1和对比例2。对比例1的变形量比对比例2的变形量小，但对比例1的变形量大于实施例4的变形量。
由此可见，实施例1-4中，阴极极片对位凹槽G32在长度和宽度上均大于阳极极耳收容凹槽G11，能完全避免析锂，且能有效控制软包装锂离子电池的变形。相比对比例2，在对比例1中，阴极极片对位凹槽G32在长度和宽度上均小于阳极极耳收容凹槽G11，能减轻析锂，并减轻变形量。

Claims (29)

  1. 一种二次电池电芯，包括：
    阳极极片(1)，包括：
    阳极集流体(11)；以及
    阳极膜片(12)，设置在阳极集流体(11)的表面；
    阳极极耳(2)；
    阴极极片(3)，包括：
    阴极集流体(31)；以及
    阴极膜片(32)，设置在阴极集流体(31)的表面；
    阴极极耳(4)；以及
    隔离膜(5)，设置于阳极极片(1)和阴极极片(3)之间；
    其中，
    阳极极片(1)形成有：
    阳极极耳收容凹槽(G11)，底部为阳极集流体(11)而周侧为阳极膜片(12)，阳极极耳(2)收容于阳极极耳收容凹槽(G11)内并电连接于阳极极耳收容凹槽(G11)处的阳极集流体(11)；
    阴极极片(3)形成有：
    阴极极耳收容凹槽(G31)，底部为阴极集流体(31)而周侧为阴极膜片(32)，阴极极耳(4)收容于阴极极耳收容凹槽(G31)内并电连接于阴极极耳收容凹槽(G31)处的阴极集流体(31)；
    其特征在于，
    阴极极片(3)还形成有：
    阴极极片对位凹槽(G32)，底部为阴极集流体(31)而周侧为阴极膜片(32)，位于阴极极片(3)的与阳极极耳收容凹槽(G11)对位的区域。
  2. 根据权利要求1所述的二次电池电芯，其特征在于，阴极极片对位凹槽(G32)在长度和宽度上均大于阳极极耳收容凹槽(G11)。
  3. 根据权利要求2所述的二次电池电芯，其特征在于，阴极极片对位凹槽(G32)在长度和宽度上均大于阳极极耳收容凹槽(G11)0.5～3mm。
  4. 根据权利要求1所述的二次电池电芯，其特征在于，所述二次电池电芯还包括：
    阴极极片对位凹槽用双面绝缘胶带(T1)，覆盖整个阴极极片对位凹槽(G32)，且在两面上分别粘接隔离膜(5)和阴极极片对位凹槽(G32)周围的阴极膜片(32)。
  5. 根据权利要求1所述的二次电池电芯，其特征在于，所述二次电池电芯还包括：
    阴极极耳收容凹槽用双面绝缘胶带(T2)，覆盖整个阴极极耳收容凹槽(G31)，且在两面上分别粘接隔离膜(5)和阴极极耳收容凹槽(G31)周围的阴极膜片(32)。
  6. 根据权利要求1所述的二次电池电芯，其特征在于，
    阳极极耳(2)采用超声波焊接、激光焊接或热压焊接方式电连接于阳极极耳收容凹槽(G11)处的阳极集流体(11)。
  7. 根据权利要求1所述的二次电池电芯，其特征在于，
    阴极极耳(4)采用超声波焊接、激光焊接或热压焊接方式电连接于阴极极耳收容凹槽(G31)处的阴极集流体(31)。
  8. 根据权利要求1所述的二次电池电芯，其特征在于，
    阳极极耳收容凹槽(G11)通过激光清洗、机械清洗或发泡胶清洗将阳极膜片(12)的对应部分去除以露出阳极集流体(11)而形成；或者
    阳极极耳收容凹槽(G11)通过涂布阳极膜片浆料之前预置热敏型发泡胶纸在阳极集流体(11)上、之后涂布并干燥阳极膜片浆料以形成阳极膜片(12)且在干燥阳极膜片浆料时热敏型发泡胶纸从阳极集流体(11)上剥离形成；或者
    阳极极耳收容凹槽(G11)通过在涂布阳极膜片浆料之前预涂发泡浆料在阳极集流体(11)上并干燥、之后涂布并干燥阳极膜片浆料以形成阳极膜片(12)且在干燥阳极膜片浆料时干燥的发泡浆料从阳极集流体(11)上剥离形成。
  9. 根据权利要求1所述的二次电池电芯，其特征在于，
    阴极极耳收容凹槽(G31)通过激光清洗、机械清洗或发泡胶清洗将阴极膜片(32)的对应部分去除以露出阴极集流体(31)而形成；或者
    阴极极耳收容凹槽(G31)通过涂布阴极膜片浆料之前预置热敏型发泡胶纸在阴极集流体(31)上、之后涂布并干燥阴极膜片浆料以形成阴极膜片(32)且在干燥阴极膜片浆料时热敏型发泡胶纸从阴极集流体(31)上剥离形成；或者
    阴极极耳收容凹槽(G31)通过在涂布阴极膜片浆料之前预涂发泡浆料在阴极集流体(31)上并干燥、之后涂布并干燥阴极膜片浆料以形成阴极膜片(32)且在干燥阴极膜片浆料时干燥的发泡浆料从阴极集流体(11)上剥离形成。
  10. 根据权利要求1所述的二次电池电芯，其特征在于，
    阴极极片对位凹槽(G32)通过激光清洗、机械清洗或发泡胶清洗将阴极膜片(32)的对应部分去除以露出阴极集流体(31)而形成；或者
    阴极极片对位凹槽(G32)通过涂布阴极膜片浆料之前预置热敏型发泡胶纸在阴极集流体(31)上、之后涂布并干燥阴极膜片浆料以形成阴极膜片(32)且在干燥阴极膜片浆料时热敏型发泡胶纸从阴极集流体(31)上剥离形成；或者
    阴极极片对位凹槽(G32)通过在涂布阴极膜片浆料之前预涂发泡浆料在阴极集流体(31)上并干燥、之后涂布并干燥阴极膜片浆料以形成阴极膜片(32)且在干燥阴极膜片浆料时干燥的发泡浆料从阴极集流体(11)上剥离形成。
  11. 根据权利要求4所述的二次电池电芯，其特征在于，阴极极片对位 凹槽用双面绝缘胶带(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。
  12. 根据权利要求5所述的二次电池电芯，其特征在于，阴极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。
  13. 根据权利要求1所述的二次电池电芯，其特征在于，
    阴极极片(3)还形成有：
    阴极配对凹部(R31)，底部为阴极集流体(31)而周侧为阴极膜片(32)，位于阴极极耳收容凹槽(G31)的正对背侧。
  14. 根据权利要求13所述的二次电池电芯，其特征在于，所述二次电池电芯还包括：
    阴极配对凹部用双面绝缘胶带(T3)，覆盖整个阴极配对凹部(R31)，且在两面上分别粘接隔离膜(5)和阴极配对凹部(R31)周围的阴极膜片(32)。
  15. 根据权利要求13所述的二次电池电芯，其特征在于，
    阴极配对凹部(R31)通过激光清洗、机械清洗或发泡胶清洗将阴极膜片(32)的对应部分去除以露出阴极集流体(31)而形成；或者
    阴极配对凹部(R31)通过涂布阴极膜片浆料之前预置热敏型发泡胶纸在阴极集流体(31)上、之后涂布并干燥阴极膜片浆料以形成阴极膜片(32)且在干燥阴极膜片浆料时热敏型发泡胶纸从阴极集流体(31)上剥离形成；或者
    阴极配对凹部(R31)通过在涂布阴极膜片浆料之前预涂发泡浆料在阴极集流体(31)上并干燥、之后涂布并干燥阴极膜片浆料以形成阴极膜片(32)且在干燥阴极膜片浆料时干燥的发泡浆料从阴极集流体(11)上剥离形成。
  16. 根据权利要求14所述的二次电池电芯，其特征在于，阴极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。
  17. 根据权利要求1所述的二次电池电芯，其特征在于，
    阳极极片(1)还形成有：
    阳极配对凹部(R11)，底部为阳极集流体(11)而周侧为阳极膜片(12)，位于阳极极耳收容凹槽(G11)的正对背侧；
    阴极极片(3)还形成有：
    阴极极片对位凹部(R32)，底部为阴极集流体(31)而周侧为阴极膜片(32)，位于阴极极片(3)的与阳极配对凹部(R11)对位的区域，且在长度和宽度上均大于阳极配对凹部(R11)。
  18. 根据权利要求17所述的二次电池电芯，其特征在于，阴极极片对位凹部(R32)在长度和宽度上均大于阳极配对凹部(R11)1～2mm。
  19. 根据权利要求17所述的二次电池电芯，其特征在于，
    所述二次电池电芯还包括：
    阴极极片对位凹部用双面绝缘胶带(T4)，覆盖整个阴极极片对位凹部(R32)，且在两面上分别粘接隔离膜(5)和阴极极片对位凹部(R32)周围的阴极膜片(32)。
  20. 根据权利要求17所述的二次电池电芯，其特征在于，
    阳极配对凹部(R11)通过激光清洗、机械清洗或发泡胶清洗将阳极膜片(12)的对应部分去除以露出阳极集流体(11)而形成；或者
    阳极配对凹部(R11)通过涂布阳极膜片浆料之前预置热敏型发泡胶纸在阳极集流体(11)上、之后涂布并干燥阳极膜片浆料以形成阳极膜片(12)且在干燥阳极膜片浆料时热敏型发泡胶纸从阳极集流体(11)上剥离形成；或者
    阳极配对凹部(R11)通过在涂布阳极膜片浆料之前预涂发泡浆料在阳极集流体(11)上并干燥、之后涂布并干燥阳极膜片浆料以形成阳极膜片(12)且在干燥阳极膜片浆料时干燥的发泡浆料从阳极集流体(11)上剥离形成。
  21. 根据权利要求17所述的二次电池电芯，其特征在于，
    阴极极片对位凹部(R32)通过激光清洗、机械清洗或发泡胶清洗将阴极膜片(32)的对应部分去除以露出阴极集流体(31)而形成；或者
    阴极极片对位凹部(R32)通过涂布阴极膜片浆料之前预置热敏型发泡胶纸在阴极集流体(31)上、之后涂布并干燥阴极膜片浆料以形成阴极膜片(32)且在干燥阴极膜片浆料时热敏型发泡胶纸从阴极集流体(31)上剥离形成；或者
    阴极极片对位凹部(R32)通过在涂布阴极膜片浆料之前预涂发泡浆料在阴极集流体(31)上并干燥、之后涂布并干燥阴极膜片浆料以形成阴极膜片(32)且在干燥阴极膜片浆料时干燥的发泡浆料从阴极集流体(11)上剥离形成。
  22. 根据权利要求19所述的二次电池电芯，其特征在于，阴极极片对位凹部用双面绝缘胶带(T4)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。
  23. 根据权利要求1-22中任一项所述的二次电池电芯，其特征在于，
    阳极极耳收容凹槽(G11)的宽度为阳极极耳(2)的宽度的1～2倍，阳极极耳收容凹槽(G11)的长度为阳极极耳(2)的收容于阳极极耳收容凹槽(G11)内的部分的长度的1～3倍，阳极极耳收容凹槽(G11)的深度等于阳极膜片(12)的厚度。
  24. 根据权利要求1-22中任一项所述的二次电池电芯，其特征在于，
    阴极极耳收容凹槽(G31)的宽度为阴极极耳(4)的宽度的1～2倍，阴极极耳收容凹槽(G31)的长度为阴极极耳(4)的收容于阴极极耳收容凹槽(G31)内的部分的长度的1～3倍，阴极极耳收容凹槽(G31)的深度等于阴极膜片(32)的厚度。
  25. 根据权利要求1所述的二次电池电芯，其特征在于，
    阳极极片(1)为一整体片，二次电池电芯为卷绕式电芯，在阳极极片 (1)展开状态下，阳极极片(1)的头部至尾部的距离定义为D1，阳极极耳收容凹槽(G11)的中心线至阳极极片(1)的头部之间的距离定义为d1，d1处于自阳极极片(1)的头部起计算的1/10D1～7/10D1的范围内。
  26. 根据权利要求25所述的二次电池电芯，其特征在于，d1处于自阳极极片(1)的头部起计算的3/10D1～7/10D1的范围内。
  27. 根据权利要求25所述的二次电池电芯，其特征在于，阳极集流体(11)位于阳极极片(1)的头部附近处仅一个表面设置阳极膜片(12)。
  28. 根据权利要求1所述的二次电池电芯，其特征在于，
    阴极极片(3)为一整体片，二次电池电芯为卷绕式电芯，在阴极极片(3)展开状态下，阴极极片(3)的头部至尾部的距离定义为D2，阴极极耳收容凹槽(G31)的中心线至阴极极片(3)的头部之间的距离定义为d2，d2处于自阴极极片(3)的头部起计算的1/10D2～7/10D2的范围内。
  29. 根据权利要求28所述的二次电池电芯，其特征在于，d2处于自阴极极片(3)的头部起计算的3/10D2～7/10D2的范围内。
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110299567A (zh) * 2019-07-30 2019-10-01 广东利元亨智能装备股份有限公司 电芯配对设备
CN110542361A (zh) * 2019-09-29 2019-12-06 广东利元亨智能装备股份有限公司 检测装置
CN111755663A (zh) * 2019-03-29 2020-10-09 宁德新能源科技有限公司 极片及应用该极片的电芯
CN113285110A (zh) * 2021-03-24 2021-08-20 中航锂电（洛阳）有限公司 电池、涂胶方法及电芯的制造方法
WO2021227896A1 (zh) * 2020-05-11 2021-11-18 珠海冠宇电池股份有限公司 电池和电子设备
CN113826240A (zh) * 2020-12-30 2021-12-21 宁德新能源科技有限公司 电极组件和电化学装置
CN114788035A (zh) * 2021-03-30 2022-07-22 宁德新能源科技有限公司 电极组件、电池及用电装置
CN115513611A (zh) * 2022-10-27 2022-12-23 惠州锂威新能源科技有限公司 电芯及电芯制造方法
CN116031364A (zh) * 2022-10-13 2023-04-28 宁德新能源科技有限公司 一种极片、电化学装置及电子设备
US12087914B2 (en) 2020-05-11 2024-09-10 Zhuhai Cosmx Battery Co., Ltd. Wound-type cell and preparation method thereof, battery and electronic product
US12278330B2 (en) 2014-01-17 2025-04-15 Ningde Amperex Technology Limited Lithium-ion battery having desirable safety performance
WO2025167366A1 (zh) * 2024-02-07 2025-08-14 宁德时代新能源科技股份有限公司 电极组件、电极组件的制造方法、电池单体、电池和用电装置
EP4672483A1 (en) * 2024-06-25 2025-12-31 Samsung Sdi Co., Ltd. BATTERY ELECTRODE PLATE AND ITS MANUFACTURING PROCESS

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110729447A (zh) * 2019-10-09 2020-01-24 惠州锂威新能源科技有限公司 一种电芯极片及电芯
EP4376206A4 (en) * 2021-07-23 2025-03-26 Ningde Amperex Technology Limited CELL AND ELECTRICAL DEVICE
EP4386966A4 (en) * 2021-09-30 2025-06-25 Ningde Amperex Technology Ltd. Cell and electric device using same
CN113948826B (zh) * 2021-11-18 2025-01-14 珠海冠宇电池股份有限公司 电极组件和电池
WO2023150970A1 (zh) * 2022-02-10 2023-08-17 宁德新能源科技有限公司 电芯、电池及用电设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103579666A (zh) * 2013-11-04 2014-02-12 维动新能源股份有限公司 一种低内阻复合锂离子电芯及其制作工艺
CN203733894U (zh) * 2014-01-17 2014-07-23 宁德新能源科技有限公司 锂离子电池
CN104157914A (zh) * 2014-09-02 2014-11-19 山东齐星新能源科技有限责任公司 一种高功率软包装锂离子电池及其制作工艺
CN204809314U (zh) * 2015-06-12 2015-11-25 宁德时代新能源科技有限公司 二次电池电芯

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100322096B1 (ko) * 1999-11-02 2002-02-06 김순택 리튬 폴리머 전지
CN201084764Y (zh) * 2007-07-30 2008-07-09 比亚迪股份有限公司 一种软包装电池
KR101152651B1 (ko) * 2007-09-12 2012-06-04 주식회사 엘지화학 양면 접착 테이프에 의해 안전성이 향상된 리튬 이차전지
JP2010080214A (ja) * 2008-09-25 2010-04-08 Sumitomo Electric Ind Ltd 電池
JP2012028089A (ja) * 2010-07-21 2012-02-09 Sanyo Electric Co Ltd 非水系二次電池及び非水系二次電池パック
WO2012127563A1 (ja) * 2011-03-18 2012-09-27 アロイ工業株式会社 リチウムイオン電池とその電極
CN202585646U (zh) * 2012-05-23 2012-12-05 深圳市迪凯特电池科技有限公司 一种新型卷绕结构的锂离子电池
CN203134896U (zh) * 2012-12-21 2013-08-14 中银（宁波）电池有限公司 一种电池集电体
CN104073179B (zh) * 2013-03-29 2019-05-07 日东电工（上海松江）有限公司 电化学装置用粘合带
CN103296314A (zh) * 2013-05-31 2013-09-11 深圳市格瑞普电池有限公司 叠片锂离子电池制备方法以及电池

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103579666A (zh) * 2013-11-04 2014-02-12 维动新能源股份有限公司 一种低内阻复合锂离子电芯及其制作工艺
CN203733894U (zh) * 2014-01-17 2014-07-23 宁德新能源科技有限公司 锂离子电池
CN104157914A (zh) * 2014-09-02 2014-11-19 山东齐星新能源科技有限责任公司 一种高功率软包装锂离子电池及其制作工艺
CN204809314U (zh) * 2015-06-12 2015-11-25 宁德时代新能源科技有限公司 二次电池电芯

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12278329B2 (en) 2014-01-17 2025-04-15 Ningde Amperex Technology Limited Lithium-ion battery having desirable safety performance
US12278330B2 (en) 2014-01-17 2025-04-15 Ningde Amperex Technology Limited Lithium-ion battery having desirable safety performance
CN111755663B (zh) * 2019-03-29 2022-12-13 宁德新能源科技有限公司 极片及应用该极片的电芯
CN111755663A (zh) * 2019-03-29 2020-10-09 宁德新能源科技有限公司 极片及应用该极片的电芯
CN110299567A (zh) * 2019-07-30 2019-10-01 广东利元亨智能装备股份有限公司 电芯配对设备
CN110542361A (zh) * 2019-09-29 2019-12-06 广东利元亨智能装备股份有限公司 检测装置
WO2021227896A1 (zh) * 2020-05-11 2021-11-18 珠海冠宇电池股份有限公司 电池和电子设备
US12087914B2 (en) 2020-05-11 2024-09-10 Zhuhai Cosmx Battery Co., Ltd. Wound-type cell and preparation method thereof, battery and electronic product
CN113826240A (zh) * 2020-12-30 2021-12-21 宁德新能源科技有限公司 电极组件和电化学装置
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CN114788035A (zh) * 2021-03-30 2022-07-22 宁德新能源科技有限公司 电极组件、电池及用电装置
CN116031364A (zh) * 2022-10-13 2023-04-28 宁德新能源科技有限公司 一种极片、电化学装置及电子设备
CN115513611A (zh) * 2022-10-27 2022-12-23 惠州锂威新能源科技有限公司 电芯及电芯制造方法
CN115513611B (zh) * 2022-10-27 2023-06-30 惠州锂威新能源科技有限公司 电芯及电芯制造方法
WO2025167366A1 (zh) * 2024-02-07 2025-08-14 宁德时代新能源科技股份有限公司 电极组件、电极组件的制造方法、电池单体、电池和用电装置
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