WO2024088367A1 - 电极组件、单体电池、电池模组及电极组件的制备方法 - Google Patents

电极组件、单体电池、电池模组及电极组件的制备方法 Download PDF

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Publication number
WO2024088367A1
WO2024088367A1 PCT/CN2023/126999 CN2023126999W WO2024088367A1 WO 2024088367 A1 WO2024088367 A1 WO 2024088367A1 CN 2023126999 W CN2023126999 W CN 2023126999W WO 2024088367 A1 WO2024088367 A1 WO 2024088367A1
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WIPO (PCT)
Prior art keywords
diaphragm
support member
pole piece
electrode assembly
winding
Prior art date
Application number
PCT/CN2023/126999
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English (en)
French (fr)
Inventor
罗金树
Original Assignee
厦门海辰储能科技股份有限公司
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Publication of WO2024088367A1 publication Critical patent/WO2024088367A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • 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
    • H01M4/04—Processes of manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • H01M50/461—Separators, membranes or diaphragms characterised by their combination with electrodes with adhesive layers between electrodes and separators
    • 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 application relates to the field of battery technology, and in particular to an electrode assembly, a single cell, a battery module, and a method for preparing the electrode assembly.
  • the electrode assembly not only affects the power supply performance of the battery, but also affects the safety of the battery. After winding, a central hole is formed inside the electrode assembly.
  • the electrode sheet of the electrode assembly will generate a squeezing force after expansion, causing the center hole to collapse and even cause a short circuit.
  • the collapse of the center hole not only affects the power supply performance of the battery, but also affects the safety of the battery.
  • the electrode assembly can prevent the central hole from collapsing.
  • an electrode assembly comprising:
  • the first diaphragm comprises a first supporting section and a first isolating section, the first supporting section and the first isolating section are arranged adjacent to each other along the length direction of the first diaphragm, the first supporting section is located at a position close to the winding start side of the first diaphragm, and the first supporting section can be wound at least one circle;
  • a support member wherein the support member is arranged on at least one side of the first diaphragm along the thickness direction of the first diaphragm or/and at least one side of the second diaphragm along the thickness direction of the second diaphragm, and along the thickness direction of the first diaphragm, the projection of the support member on the first diaphragm is located within the first support segment, the projections of the first pole piece and the second pole piece on the first diaphragm are located outside the first support segment, and the first pole piece and the second pole piece are both spaced apart from the support member.
  • the first electrode piece and the second electrode piece are isolated by the first diaphragm and the second diaphragm to avoid a short circuit between the first electrode piece and the second electrode piece;
  • the first support segment can be wound at least one circle, and the setting position of the support member corresponds to the position of the first support segment, thereby improving the supporting capacity of the first support segment after winding, preventing the center hole from collapsing when the electrode assembly is subjected to external force, thereby ensuring the normal power supply of the battery and improving the safety of the battery.
  • a single cell comprising an electrode assembly as described in any of the above technical solutions.
  • a battery module comprising at least one single battery as described in the above technical solution.
  • the above-mentioned single cell and battery module both include the aforementioned electrode assembly.
  • the first support segment can be wound at least one circle, and the setting position of the support member corresponds to the position of the first support segment, thereby improving the supporting capacity of the first support segment after winding, preventing the center hole from collapsing when the electrode assembly is subjected to external force, thereby ensuring the normal power supply of the battery and improving the safety of the battery.
  • a method for preparing an electrode assembly comprising the following steps:
  • the first pole piece is arranged on a side of the first diaphragm away from the second diaphragm, and the second pole piece is arranged between the first diaphragm and the second diaphragm;
  • the first pole piece, the first separator, the second pole piece and the second separator are wound.
  • the preparation method of the above-mentioned electrode assembly first rolls up the first diaphragm and the second diaphragm in an empty state, then sets a support member on at least one of the first diaphragm and the second diaphragm, and then rolls in the first pole piece and the second pole piece.
  • the rolled electrode assembly has enhanced compressive strength of the center hole through the support member, thereby preventing the center hole of the electrode assembly from collapsing.
  • FIG1 is a cross-sectional view of the expanded structure of an electrode assembly in an embodiment of the present application.
  • FIG2 is a side view of the expanded structure of the electrode assembly in the embodiment of FIG1 ;
  • FIG. 3 is a flow chart of a method for preparing an electrode assembly in an embodiment of the present application.
  • 110 first pole piece; 120: second pole piece; 210: first diaphragm; 211: first supporting section; 2111: first pre-rolling area; 2112: first supporting area; 2113: first spacing area; 212: first isolation segment; 2121: second spacing area; 220: second diaphragm; 310: first supporting member; 320: second supporting member; 410: winding starting side; 420: winding ending side; 430: inner ring side; 440: outer ring side.
  • first and second are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number or order of the indicated technical features. Therefore, a feature defined as “first” or “second” may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality” is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
  • the battery module usually includes at least one single cell, and the single cell is provided with an electrode assembly to achieve cyclic charging and discharging.
  • a center hole is formed in the middle of the electrode assembly after winding.
  • the pole pieces of the electrode assembly are prone to expand and generate a squeezing force toward the center hole, thereby causing the center hole to collapse.
  • the center hole of the electrode assembly will also collapse.
  • an electrode assembly including a first electrode sheet 110 , a first diaphragm 210 , a second electrode sheet 120 , a second diaphragm 220 and a support member, wherein the first electrode sheet 110 , the first diaphragm 210 , the second electrode sheet 120 and the second diaphragm 220 are sequentially stacked and wound.
  • first pole piece 110 and the second pole piece 120 are respectively located on opposite sides of the first diaphragm 210, and the second diaphragm 220 and the first diaphragm 210 are respectively located on opposite sides of the second pole piece 120.
  • Such an arrangement makes it possible for the first pole piece 110 and the second pole piece 120 to not contact each other, thereby achieving insulation between the first pole piece 110 and the second pole piece 120.
  • the first diaphragm 210 has a first support segment 211 and a first isolation segment 212.
  • the first support segment 211 and the first isolation segment 212 are adjacently arranged along the length direction of the first diaphragm 210.
  • the first support segment 211 is located at a position of the first diaphragm 210 close to the winding starting side 410, and the first support segment 211 can be wound at least one circle.
  • the first diaphragm 210 includes a first support section 211 and a first isolation section 212 from the winding start side 410 to the winding end side 420.
  • the first support section 211 is used to improve the pressure resistance of the center hole
  • the first isolation section 212 is used to isolate the first pole piece 110 from the second pole piece 120.
  • the first support section 211 can be wound at least one circle, so that the circumference of the center hole after winding is supported by the first support section 211, thereby improving the pressure resistance.
  • the support member is arranged on at least one side of the first diaphragm 210 along the thickness direction of the first diaphragm 210 and/or at least one side of the second diaphragm 220 along the thickness direction of the second diaphragm 220, and along the thickness direction of the first diaphragm 210, the projection of the support member on the first diaphragm 210 is located inside the first support segment 211, and the projections of the first pole piece 110 and the second pole piece 120 on the first diaphragm 210 are located outside the first support segment 211, and the first pole piece 110 and the second pole piece 120 are both spaced apart from the support member.
  • a support member is provided on at least one side of at least one of the first diaphragm 210 and the second diaphragm 220 to improve the external pressure resistance of the first support section 211 after winding, thereby preventing the central hole from collapsing under the action of extrusion.
  • a support member (first support member 310 ) is provided on the side of the first diaphragm facing the second diaphragm, and support members (first support member 310 and second support member 320 ) are provided on opposite sides of the second diaphragm to improve the external pressure resistance of the first support segment 211 .
  • the projection of the support member on the first diaphragm 210 is located within the first support section 211, so that the support function of the support member is mainly used in the middle area of the first support section 211 to concentrate the force to resist the external pressure.
  • the first pole piece 110 and the second pole piece 120 are located outside the first support section and in the first isolation section when projected along the thickness direction of the first diaphragm 210, so that the first pole piece 110 and the second pole piece 120 have a better isolation effect and avoid short circuit caused by contact.
  • the electrode assembly includes a first electrode sheet 110 and a second electrode sheet 120 through a first diaphragm 210 and a second
  • the diaphragm 220 achieves isolation to avoid a short circuit between the first pole piece 110 and the second pole piece 120;
  • the first support segment 211 can be wound at least one circle, and the setting position of the support member corresponds to the position of the first support segment 211, thereby improving the supporting capacity of the first support segment 211 after winding, preventing the center hole from collapsing when the electrode assembly is subjected to external force, thereby ensuring the normal power supply of the battery and improving the safety of the battery.
  • the support member is made of insulating material.
  • the first support segment 211 has a first pre-rolling area 2111 and a first support area 2112.
  • the first pre-rolling area 2111 and the first support area 2112 are adjacently arranged along the length direction of the first diaphragm 210.
  • the first pre-rolling area 2111 is located at a position of the first support segment 211 close to the winding starting side 410.
  • the first pre-rolling area 2111 can be wound at least one circle.
  • the direction from the winding start side 410 to the winding end side 420 is the length direction of the first diaphragm 210, which is also the length direction of the second diaphragm 220, and the direction perpendicular to the length direction is the width direction.
  • the left-right direction in the perspective of FIG. 1 and FIG. 2 is the length direction of the first diaphragm 210; the up-down direction in the perspective of FIG. 2 is the width direction of the first diaphragm 210.
  • the first pre-rolling area 2111 and the first supporting area 2112 are adjacently arranged, and the first pre-rolling area 2111 can be wound at least one circle to improve the supporting strength of the first supporting section 211 after winding.
  • the support member includes a first support member 310 .
  • the projection of the first support member 310 on the first diaphragm 210 is located in the first support area 2112 , and the first support member 310 is disposed between the first diaphragm 210 and the second diaphragm 220 .
  • the first support member 310 is located between the first diaphragm 210 and the second diaphragm 220. After the first pre-rolled area 2111 is unrolled for at least one turn, the first support member 310 is wound during further winding, thereby improving the compressive strength of the first support segment 211 and preventing the center hole from collapsing when the electrode assembly is subjected to external pressure.
  • the length of the first supporting member 310 is equal to the length of the first supporting area 2112 .
  • the support member further includes a second support member 320,
  • the second support member 320 is located on a side of the second diaphragm 220 away from the first support member 310 , and along the thickness direction of the first diaphragm 210 , a projection of the second support member 320 on the first diaphragm 210 at least partially overlaps with a projection of the first support member 310 on the first diaphragm 210 .
  • the joint arrangement of the second support member 320 and the first support member 310 greatly enhances the pressure resistance of the first diaphragm 210 and the second diaphragm 220 wound at the position of the center hole, thereby preventing the center hole from collapsing after being compressed.
  • a first support member 310 is arranged between the first diaphragm 210 and the second diaphragm 220, and a second support member 320 is arranged on the side of the second diaphragm 220 facing away from the first support member 310.
  • the size of the second support member 320 is roughly the same as or completely the same as the size of the first support member 310. In the thickness direction of the first diaphragm 210, the first support member 310 and the second support member 320 overlap.
  • first support member 310 and the second support member 320 are substantially rectangular in shape so as to be wound together with the first diaphragm 210 and the second diaphragm 220 .
  • the first supporting section 211 further has a first spacing area 2113 .
  • the first spacing area 2113 is located at a side of the first supporting area 2112 away from the first pre-rolling area 2111 .
  • the provision of the first spacing area 2113 ensures that the first pole piece 110 and the second pole piece 120 are spaced apart from the support member in the first support section 211; at the same time, even if the first support area 2113 is punctured, part of the first spacing area 2113 can be utilized to avoid as much as possible the short circuit between the first pole piece 110 or the second pole piece 120 and other parts.
  • FIG2 To show the positional relationship between the first pole piece 110, the second pole piece 120 and the second support member 320, the side view of FIG2 also shows the first pole piece 110 and the second pole piece 120 located on the other side of the second diaphragm 220, and is indicated by a dotted line.
  • FIG1 and FIG2 it can be seen that: in the length direction of the second diaphragm 220, there is a first spacing area 2113 between the first support member 310 and the second pole piece 120, and there is also a first spacing area 2113 between the second support member 320 and the second pole piece 120.
  • the industry has A center pin is clamped in the center hole, and the center pin is usually made of stainless steel and has conductive properties. If the electrode assembly is squeezed from the outside, the center hole collapses, and even the first electrode sheet 110 or the second electrode sheet 120 inside the electrode assembly is connected to the center pin, causing a short circuit problem and creating a safety hazard.
  • the first diaphragm 210 and the second diaphragm 220 are aligned on the winding starting side 410, and are wound along the first pre-rolling area 2111 for at least one circle, and then the first support member 310 and the second support member 320 are arranged and wound, and then further wound along the first spacing area 2113, so that the first support section 211 forms a reliable support structure to avoid the center hole collapsing under pressure, causing the center needle and the first pole piece 110 or the second pole piece 120 to be conductive and cause a short circuit, thereby eliminating safety hazards.
  • the second diaphragm 220 has a second supporting segment and a second isolating segment, the second supporting segment has a second pre-rolling area, a second supporting area and a third spacing area, the second pre-rolling area corresponds to the first pre-rolling area 2111, the second supporting area corresponds to the first supporting area 2112, the third spacing area corresponds to the first spacing area 2113, and the second support member 320 is arranged in the second supporting area, which will not be repeated.
  • the first electrode sheet 110 is a positive electrode sheet
  • the second electrode sheet 120 is a negative electrode sheet.
  • the second electrode sheet 120 covers the first electrode sheet 110
  • the second diaphragm 220 covers the second electrode sheet 120, satisfying the requirements of the negative electrode covering the positive electrode and the diaphragm covering the negative electrode, thereby ensuring the product quality and safety of the electrode assembly.
  • the first isolation segment 212 has a second spacing area 2121, and the second spacing area 2121 is located at one end of the first isolation segment 212 close to the winding start side 410.
  • One end of the first pole piece 110 close to the winding start side 410 is aligned with one end of the second isolation area away from the winding start side 410, and one end of the second pole piece 120 close to the winding start side 410 is aligned with one end of the second isolation area close to the winding start side 410.
  • the edge of the second electrode 120 exceeds the edge of the first electrode 110 (positive electrode), so that the lithium ions separated from the positive electrode active material layer can be smoothly embedded in the negative electrode active material layer, thereby avoiding the lithium precipitation phenomenon on the second electrode 120 (negative electrode), thereby avoiding the diaphragm being blocked.
  • the safety accidents caused by puncture are improved, and the safety of the battery cell/electrode assembly of the secondary battery is improved.
  • a second spacing area 2121 is provided at one end of the first isolation segment 212 close to the winding starting side 410, and a second spacing area 2121 exists between one end of the first pole piece 110 close to the winding starting side 410 and the first spacing area 2113, and one end of the second pole piece 120 close to the winding starting side 410 is aligned with one end of the second spacing area 2121 close to the winding starting side 410, so that the first pole piece 110 and the second pole piece 120 are not wound in at the same time during winding, so that the electrode assembly has better support after winding.
  • the leftmost end of the first pole piece 110 is located to the right of the leftmost end of the second pole piece 120 .
  • the second pole piece 120 is wound in first, and then the first pole piece 110 is wound in after winding for a certain length.
  • the length of the first pre-rolling area 2111 is L1
  • the length of the first supporting area 2112 is L2
  • the length of the first spacing area 2113 is L3
  • the length of the second spacing area 2121 is L4 .
  • the length of L1 can make the first diaphragm 210 and the second diaphragm 220 roll at least one turn, for example, 1-2 turns.
  • the length of L2 can be equal to the length of the first support member 310 or the length of the second support member 320, for example, L2 can be 1mm-100mm.
  • the length of L3 can be 1mm-100mm.
  • the length of L4 is actually the length of the second pole piece 120 rolled in before the first pole piece 110, and L4 is not less than 3mm.
  • the first support member 310 is extended along the length direction of the first diaphragm 210 , and the width of the first support member 310 is greater than 0.5 times and less than 1 times the width of the first diaphragm 210 .
  • the first support member 310 is extended along the length direction of the first diaphragm 210 to facilitate winding.
  • the width of the first support member 310 is not greater than the width of the first diaphragm 210, thereby playing a supporting role for the middle area of the central hole.
  • the second support member 320 is extended along the length direction of the second diaphragm 220 , and the width of the second support member 320 is greater than 0.5 times and less than 1 times the width of the second diaphragm 220 .
  • the second support member 320 is extended along the length direction of the second diaphragm 220 to facilitate winding, and the width of the second support member 320 is not greater than the width of the second diaphragm 220. width, thereby supporting the middle area of the center hole.
  • the width of the second support member 320 is W1
  • the width of the second diaphragm 220 is W2
  • the width of the second diaphragm 220 is greater than the width of the second support member 320 .
  • the length of the first support member 310 is equal to the length of the second support member 320 , and the lengths of the first support member 310 and the second support member 320 are both equal to the length of the first support area 2112 .
  • the support member is a colloid, and the colloid is bonded to the first diaphragm 210 and/or the second diaphragm 220 .
  • the colloid is an insulator and is easy to be bonded to the first diaphragm 210 and the second diaphragm 220.
  • the first support member 310 is directly bonded between the first diaphragm 210 and the second diaphragm 220, and the second support member 320 is directly bonded to the side of the second diaphragm 220 away from the first support member 310.
  • the support member is a double-sided adhesive tape. After winding, the first support member 310, the second support member 320, the first diaphragm 210 and the second diaphragm 220 can make the first isolation section 212 form a stable inner shell, thereby having better support and effectively improving the problem of central hole collapse.
  • the thickness of the double-sided tape is 25 ⁇ m-100 ⁇ m.
  • the first pole piece 110 is located at the inner ring side 430 of the electrode assembly.
  • One end of the first pole piece 110 close to the winding end side 420 does not exceed one end of the first isolation segment 212 close to the winding end side 420;
  • one end of the second pole piece 120 close to the winding end side 420 exceeds one end of the first diaphragm 210 close to the winding end side 420, and does not exceed one end of the second diaphragm 220 close to the winding end side 420.
  • Such an arrangement enables the first diaphragm 210 , the second diaphragm 220 , the first pole piece 110 and the second pole piece 120 to be better rolled up after winding, thereby obtaining an electrode assembly with a more compact structure.
  • the side of the first diaphragm 210 away from the second pole piece 120 is the inner circle side 430
  • the side of the second diaphragm 220 away from the second pole piece 120 is the outer circle side 440.
  • the first pole piece 110 is located at the innermost side of the inner circle side 430
  • the second diaphragm 220 is located at the outermost side of the outer circle side 440.
  • the width of the first pole piece 110 is smaller than that of the second pole piece 120.
  • the width of the second pole piece 120 is smaller than the width of the first diaphragm 210 .
  • Such a configuration can enable the first diaphragm 210 and the second diaphragm 220 to effectively isolate the first electrode sheet 110 and the second electrode sheet 120, thereby avoiding contact between the first electrode sheet 110 and the second electrode sheet 120 to cause a short circuit; at the same time, when the first electrode sheet 110 is a positive electrode sheet and the second electrode sheet 120 is a negative electrode sheet, the edge of the negative electrode sheet exceeds the edge of the positive electrode sheet, which can enable the lithium ions detached from the positive electrode active material layer to be smoothly embedded in the negative electrode active material layer, thereby avoiding lithium plating on the negative electrode sheet, thereby avoiding safety accidents caused by puncturing the diaphragm, and improving the safety of the battery cell/electrode assembly of the secondary battery.
  • the width of the first pole piece 110 is W3
  • the width of the second pole piece 120 is W4 .
  • the width of the first pole piece 110 is smaller than that of the second pole piece 120 , thereby achieving better isolation through the first diaphragm 210 and the second diaphragm 220 .
  • a single cell comprising the electrode assembly as described in any of the above embodiments.
  • the single cell may be a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery or a magnesium ion battery, etc., without limitation.
  • the shape of the single cell may be a cylinder, a flat body, a cuboid or other shapes, without limitation.
  • a battery module comprising at least one single battery as described in the above embodiment.
  • the battery module may include two, three, or four single cells, etc., to have a greater power output capacity.
  • the single cell and the battery module both include the aforementioned electrode assembly, the first support segment 211 can be wound at least one circle, and the setting position of the support member corresponds to the position of the first support segment 211, thereby improving the supporting capacity of the first support segment 211 after winding, preventing the center hole from collapsing when the electrode assembly is subjected to external force, thereby ensuring the normal power supply of the battery and improving the safety of the battery.
  • this embodiment also provides a method for preparing an electrode assembly, comprising the following steps:
  • a support member is provided on at least one of the first diaphragm 210 and the second diaphragm 220 and is wound;
  • the first pole piece 110 is disposed on a side of the first diaphragm 210 away from the second diaphragm 220, and the second pole piece 120 is disposed between the first diaphragm 210 and the second diaphragm 220;
  • the first pole piece 110 , the first separator 210 , the second pole piece 120 , and the second separator 220 are wound.
  • the preparation method of the electrode assembly can be applied to the preparation of the electrode assembly described in any of the above-mentioned embodiments.
  • the compressive strength of the center hole of the wound electrode assembly is enhanced by the support, thereby preventing the center hole of the electrode assembly from collapsing.
  • the pre-rolled length of the first diaphragm 210 and the second diaphragm 220 can be 1-2 turns around the winding needle.
  • the support member can be set on both the first diaphragm 210 and the second diaphragm 220.
  • the support member set on the first diaphragm 210 is the first support member 310
  • the support member set on the second diaphragm 220 is the second support member 320.
  • Double-sided adhesive tape can be selected for the first support member 310 and the second support member 320.
  • first support member 310 The opposite sides of the first support member 310 are respectively bonded to the first diaphragm 210 and the second diaphragm 220, and the second support member 320 is bonded to the side of the second diaphragm 220 away from the first support member 310.
  • Such a setting is convenient for setting the support member on the one hand, and also improves the pressure resistance of the electrode assembly on the other hand, preventing the central hole from collapsing after being compressed.

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
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  • Engineering & Computer Science (AREA)
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Abstract

本申请涉及一种电极组件、单体电池、电池模组及电极组件的制备方法，电极组件包括支撑件及依次层叠并卷绕设置的第一极片(110)、第一隔膜(210)、第二极片(120)和第二隔膜(220)，第一隔膜(210)具有第一支撑段(211)和第一隔离段(212)，第一支撑段(211)位于第一隔膜(210)的靠近卷绕起始侧(410)的位置，第一支撑段(211)能够卷绕至少一圈，支撑件设于第一隔膜(210)的沿第一隔膜(210)厚度方向的至少一侧或/和第二隔膜(220)的沿第二隔膜(220)厚度方向的至少一侧，第一极片(110)和第二极片(120)均与支撑件间隔设置。

Description

电极组件、单体电池、电池模组及电极组件的制备方法
本申请要求于2022年10月28日提交中国专利局、申请号为2022113364509、申请名称为“电极组件、单体电池、电池模组及电极组件的制备方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电池技术领域，特别是涉及一种电极组件、单体电池、电池模组及电极组件的制备方法。
背景技术
电极组件作为电池的重要部件之一，不仅影响着电池的供电性能，而且也影响着电池的使用安全。卷绕后电极组件的内部形成有中心孔。
然而，在电极组件循环使用的过程中，电极组件的极片在膨胀后会产生挤压力，导致中心孔塌陷，甚至导致短路。中心孔的塌陷不仅影响到电池的供电性能，而且也影响到电池的使用安全。
发明内容
基于此，针对上述电极组件的中心孔塌陷问题，有必要提供一种电极组件、单体电池、电池模组及电极组件的制备方法；该电极组件能够防止中心孔塌陷。
其技术方案如下：
一方面，提供了一种电极组件，包括：
第一极片、第一隔膜、第二极片和第二隔膜，所述第一极片、所述第一隔膜、所述第二极片和所述第二隔膜依次层叠并卷绕设置；
所述第一隔膜具有第一支撑段和第一隔离段，所述第一支撑段和所述第一隔离段沿所述第一隔膜的长度方向相邻设置，所述第一支撑段位于所述第一隔膜的靠近卷绕起始侧的位置，所述第一支撑段能够卷绕至少一圈；
支撑件，所述支撑件设于所述第一隔膜的沿所述第一隔膜厚度方向的至少一侧或/和所述第二隔膜的沿所述第二隔膜厚度方向的至少一侧，且沿所述第一隔膜的厚度方向，所述支撑件在所述第一隔膜上的投影位于所述第一支撑段内，所述第一极片和所述第二极片在所述第一隔膜上的投影位于所述第一支撑段外，所述第一极片和所述第二极片均与所述支撑件间隔设置。
上述电极组件，第一极片和第二极片通过第一隔膜和第二隔膜实现隔离，避免第一极片和第二极片之间发生短路；第一支撑段能够卷绕至少一圈，并使支撑件的设置位置与第一支撑段的位置对应，从而提高卷绕后第一支撑段的支撑能力，防止电极组件受到外力时导致中心孔塌陷，进而保证电池的正常供电，也提高电池的安全性。
另一方面，还提供了一种单体电池，包括如上述任一个技术方案所述的电极组件。
还提供了一种电池模组，包括至少一个如上述技术方案所述的单体电池。
上述单体电池和电池模组均包括前述的电极组件，第一支撑段能够卷绕至少一圈，并使支撑件的设置位置与第一支撑段的位置对应，从而在提高卷绕后第一支撑段的支撑能力，防止电极组件受到外力时导致中心孔塌陷，进而保证电池的正常供电，也提高电池的安全性。
另外，还提供了一种电极组件的制备方法，包括以下步骤：
将第一隔膜和第二隔膜夹在卷针上卷绕预设长度；
在第一隔膜和第二隔膜中的至少一者上设置支撑件并进行卷绕；
将第一极片设在所述第一隔膜的远离所述第二隔膜的一侧，将第二极片设在所述第一隔膜和所述第二隔膜之间；
将所述第一极片、所述第一隔膜、所述第二极片和所述第二隔膜卷绕。
上述电极组件的制备方法，首先空卷第一隔膜和第二隔膜，然后在第一隔膜和第二隔膜中的至少一者上设置支撑件，之后再卷入第一极片和第二极片，卷绕后的电极组件通过支撑件增强了中心孔的抗压强度，从而防止电极组件的中心孔塌陷。
本申请的一个或多个实施例的细节在下面的附图和描述中提出。本申请的其它特征、目的和优点将从说明书、附图以及权利要求书变得明显。
附图说明
为了更好地描述和说明本申请的实施例和/或示例，可以参考一幅或多幅附图。用于描述附图的附加细节或示例不应当被认为是对所公开的申请、目前描述的实施例和/或示例以及目前理解的这些申请的最佳模式中的任何一者的范围的限制。
图1为本申请实施例中电极组件的展开结构截面图；
图2为图1实施例中电极组件的展开结构侧视图；
图3为本申请实施例中电极组件的制备方法的流程图。
附图标注说明：
110：第一极片；120：第二极片；210：第一隔膜；211：第一支撑段；
2111：第一预卷区；2112：第一支撑区；2113：第一间隔区；212：第一隔离段；2121：第二间隔区；220：第二隔膜；310：第一支撑件；320：第二支撑件；410：卷绕起始侧；420：卷绕终止侧；430：内圈侧；440：外圈侧。
具体实施方式
为了便于理解本申请，下面将参照相关附图对本申请进行更全面的描述。附图中给出了本申请的较佳实施例。但是，本申请可以以许多不同的形式来实现，并不限于本文所描述的实施例。应该理解，提供这些实施例的目的是使对本申请的公开内容的理解更加透彻全面。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量或顺序。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本申请的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请。
电动汽车等用电设备上配备电池模组进行供电，电池模组通常包括至少一个单体电池，而单体电池设置有电极组件，以实现循环式的充放电。
电极组件在卷绕后中部形成中心孔，在电极组件充放电的过程中，电极组件的极片容易膨胀并产生朝向中心孔方向的挤压作用力，进而导致中心孔塌陷；同时，若电池受到外力的挤压时，也会导致电极组件的中心孔塌陷。
请参照图1和图2，提供了一种电极组件，包括第一极片110、第一隔膜210、第二极片120、第二隔膜220和支撑件，第一极片110、第一隔膜210、第二极片120和第二隔膜220依次层叠并卷绕设置。
图1所示的实施例中，第一极片110和第二极片120分别位于第一隔膜210的相对两侧，第二隔膜220和第一隔膜210分别位于第二极片120的相对两侧，如此设置，使得第一极片110和第二极片120之间互不接触，从而实现第一极片110与第二极片120之间的绝缘。
如图1所示，第一隔膜210具有第一支撑段211和第一隔离段212，第一支撑段211和第一隔离段212沿第一隔膜210的长度方向相邻设置，第一支撑段211位于第一隔膜210的靠近卷绕起始侧410的位置，第一支撑段211能够卷绕至少一圈。
图1所示的实施例中，第一隔膜210由卷绕起始侧410至卷绕终止侧420分别为第一支撑段211和第一隔离段212，第一支撑段211用于提高中心孔的抗压能力，第一隔离段212用于使第一极片110和第二极片120隔离。第一支撑段211能够卷绕至少一圈，使卷绕后中心孔的周向通过第一支撑段211进行支撑，提高抗压能力。
如图1所示，支撑件设于第一隔膜210的沿第一隔膜210的厚度方向的至少一侧或/和第二隔膜220的沿第二隔膜220的厚度方向的至少一侧，且沿第一隔膜210的厚度方向，支撑件在第一隔膜210上的投影位于第一支撑段211内，第一极片110和第二极片120在第一隔膜210上的投影位于第一支撑段211外，第一极片110和第二极片120均与支撑件间隔设置。
在第一隔膜210和第二隔膜220中的至少一者的至少一侧设置支撑件，以利用支撑件提高卷绕后第一支撑段211的对外抗压能力，从而防止中心孔在挤压作用下产生塌陷。
如图1所示，在第一隔膜的朝向第二隔膜的一侧设有支撑件(第一支撑件310)，而第二隔膜的相对两侧均有支撑件(第一支撑件310和第二支撑件320)，以提高第一支撑段211的对外抗压能力。
支撑件在第一隔膜210上的投影位于第一支撑段211内，使得支撑件的支撑作用主要用在第一支撑段211的中部区域，以集中力量抵抗外部压力。第一极片110和第二极片120在沿第一隔膜210的厚度方向上投影时位于第一支撑段外并处于第一隔离段内，从而使第一极片110和第二极片120之间具有更好的隔离效果，避免接触造成短路。
该电极组件，第一极片110和第二极片120通过第一隔膜210和第二 隔膜220实现隔离，避免第一极片110和第二极片120之间发生短路；第一支撑段211能够卷绕至少一圈，并使支撑件的设置位置与第一支撑段211的位置对应，从而在提高卷绕后第一支撑段211的支撑能力，防止电极组件受到外力时导致中心孔塌陷，进而保证电池的正常供电，也提高电池的安全性。
可选地，支撑件由绝缘材质制成。
在一个实施例中，请参照图1和图2，第一支撑段211具有第一预卷区2111和第一支撑区2112，第一预卷区2111和第一支撑区2112沿第一隔膜210的长度方向相邻设置，第一预卷区2111位于第一支撑段211的靠近卷绕起始侧410的位置，第一预卷区2111能够卷绕至少一圈。
结合图1和图2所示，由卷绕起始侧410至卷绕终止侧420的方向为第一隔膜210的长度方向，也是第二隔膜220的长度方向，与长度方向垂直的方向为宽度方向。例如，图1和图2视角下的左右方向为第一隔膜210的长度方向；图2视角下的上下方向为第一隔膜210的宽度方向。
沿第一隔膜210的长度方向，第一预卷区2111和第一支撑区2112相邻设置，第一预卷区2111能够卷绕至少一圈，以提高卷绕后第一支撑段211的支撑强度。
如图1所示，支撑件包括第一支撑件310，沿第一隔膜210的厚度方向，第一支撑件310在第一隔膜210上的投影位于第一支撑区2112内，且第一支撑件310设在第一隔膜210和第二隔膜220之间。
图1所示的实施例中，第一支撑件310位于第一隔膜210和第二隔膜220之间，当第一预卷区2111空卷至少一圈之后，进一步卷绕时开始卷绕第一支撑件310，从而提高第一支撑段211的抗压能力，防止电极组件受到外部压力时导致中心孔塌陷。
可选地，第一支撑件310的长度与第一支撑区2112的长度相等。
在一个实施例中，请参照图1和图2，支撑件还包括第二支撑件320， 第二支撑件320位于第二隔膜220的背离第一支撑件310的一侧，沿第一隔膜210的厚度方向，第二支撑件320在第一隔膜210上的投影与第一支撑件310在第一隔膜210上的投影至少部分重合。
第二支撑件320和第一支撑件310的联合设置，使得中心孔位置处卷绕的第一隔膜210和第二隔膜220的抗压能力大大增强，从而防止受压后中心孔产生塌陷。
如图1所示，第一隔膜210和第二隔膜220之间设置有第一支撑件310，第二隔膜220的背离第一支撑件310的一侧设有第二支撑件320，第二支撑件320的尺寸和第一支撑件310的尺寸大致相当或完全相同，在第一隔膜210的厚度方向上，第一支撑件310和第二支撑件320重合。
可选地，第一支撑件310和第二支撑件320的形状大致为矩形，以便于随同第一隔膜210和第二隔膜220进行卷绕。
在一个实施例中，请参照图1，第一支撑段211还具有第一间隔区2113，第一间隔区2113位于第一支撑区2112的远离第一预卷区2111的一侧。
第一间隔区2113的设置确保了第一极片110和第二极片120均与第一支撑段211内的支撑件相互间隔；同时，即使第一支撑区2113被刺破，也能够利用第一间隔区2113的部分尽可能的避免第一极片110或第二极片120与其他部分导通发生短路。
为展示第一极片110、第二极片120和第二支撑件320的位置关系，图2的侧视图中也示出了位于第二隔膜220的另一侧的第一极片110和第二极片120，并用虚线标示。结合图1和图2可知：在第二隔膜220的长度方向上，第一支撑件310和第二极片120之间具有第一间隔区2113，第二支撑件320与第二极片120之间也具有第一间隔区2113。当第一支撑段211全部卷绕后，第一预卷区2111、第一支撑区2112和第一间隔区2113的抗压能力得到增强，从而防止中心孔的塌陷。
传统的电极组件结构中，为了解决中心孔塌陷的问题，行业内有在中 心孔内夹设中心针，中心针通常为不锈钢材质，具有导电特性。若电极组件受到外部挤压，则中心孔塌陷，甚至导致电极组件内部的第一极片110或第二极片120与中心针导通，进而引起短路问题，产生安全隐患。
本申请提供的实施例，第一隔膜210和第二隔膜220在卷绕起始侧410对齐，并沿第一预卷区2111卷绕至少一圈，然后设置第一支撑件310和第二支撑件320并卷绕，之后沿第一间隔区2113进一步卷绕，从而使第一支撑段211形成可靠的支撑结构，避免受压的情况下中心孔塌陷而导致中心针和第一极片110或第二极片120导通引起短路，从而杜绝安全隐患。
可选地，第二隔膜220具有第二支撑段和第二隔离段，第二支撑段具有第二预卷区、第二支撑区和第三间隔区，第二预卷区与第一预卷区2111对应，第二支撑区与第一支撑区2112对应，第三间隔区与第一间隔区2113对应，而第二支撑件320设在第二支撑区，不再赘述。
在一个实施例中，第一极片110为正极极片，第二极片120为负极极片。
如图1所示，可以理解的是：卷绕后的电极组件中，第二极片120包覆第一极片110，第二隔膜220包覆第二极片120，满足负极包覆正极、隔膜包覆负极的要求，确保电极组件的产品质量和使用安全。
在一个实施例中，请参照图1，第一隔离段212具有第二间隔区2121，第二间隔区2121位于第一隔离段212的靠近卷绕起始侧410的一端。第一极片110的靠近卷绕起始侧410的一端与第二隔离区的远离卷绕起始侧410的一端对齐，第二极片120的靠近卷绕起始侧410的一端与第二隔离区的靠近卷绕起始侧410的一端对齐。
如此设置，当第一极片110为正极极片，第二极片120为负极极片时，第二极片120(负极极片)的边缘超出第一极片110(正极极片)的边缘，能够使正极活性物质层上脱离的锂离子顺利嵌入至负极活性物质层上，从而避免在第二极片120(负极极片)上出现析锂现象，进而避免了因隔膜被 刺穿而引发的安全事故，提高了二次电池的电芯/电极组件的安全性。
如图1所示，第一隔离段212的靠近卷绕起始侧410的一端设有第二间隔区2121，第一极片110的靠近卷绕起始侧410的一端与第一间隔区2113之间存在第二间隔区2121，而第二极片120的靠近卷绕起始侧410的一端对齐第二间隔区2121的靠近卷绕起始侧410的一端，以使第一极片110和第二极片120在卷绕时不同时卷入，以使卷绕后的电极组件具有更好的支撑。
如图1所示的视角下，第一极片110的最左端位于第二极片120的最左端的右侧，卷绕时，先卷入第二极片120，等卷绕一段长度后再卷入第一极片110。
如图1所示，沿第一隔膜210的长度方向上，第一预卷区2111的长度为L1，第一支撑区2112的长度为L2，第一间隔区2113的长度为L3，第二间隔区2121的长度为L4。
L1的长度能够使第一隔膜210和第二隔膜220空卷至少一圈，例如空卷1-2圈。L2的长度可以与第一支撑件310的长度或第二支撑件320的长度相等，例如L2可以是1mm-100mm。L3的长度可以为1mm-100mm。L4的长度实际为第二极片120比第一极片110先卷入的长度，L4不小于3mm。
在一个实施例中，第一支撑件310沿第一隔膜210的长度方向延伸设置，第一支撑件310的宽度为第一隔膜210的宽度的0.5倍以上1倍以下。
第一支撑件310沿第一隔膜210的长度方向延伸设置，以便于卷绕，第一支撑件310的宽度不大于第一隔膜210的宽度，从而起到对中心孔的中部区域的支撑作用。
在一个实施例中，第二支撑件320沿第二隔膜220的长度方向延伸设置，第二支撑件320的宽度为第二隔膜220的宽度的0.5倍以上1倍以下。
同理，结合图1和图2所示，第二支撑件320沿第二隔膜220的长度方向延伸设置，以便于卷绕，第二支撑件320的宽度不大于第二隔膜220 的宽度，从而起到对中心孔的中部区域的支撑作用。
如图2所示的实施例中，第二支撑件320的宽度为W1，第二隔膜220的宽度为W2，第二隔膜220的宽度大于第二支撑件320的宽度。
可选地，第一支撑件310的长度和第二支撑件320的长度相等，且第一支撑件310和第二支撑件320的长度均与第一支撑区2112的长度相等。
在一个实施例中，支撑件为胶体，胶体粘接在第一隔膜210或/和第二隔膜220上。
胶体为绝缘体，且便于粘设到第一隔膜210和第二隔膜220上。第一支撑件310直接粘贴在第一隔膜210和第二隔膜220之间，第二支撑件320直接粘贴在第二隔膜220的远离第一支撑件310的一侧。
可选地，支撑件为双面胶。卷绕后，第一支撑件310、第二支撑件320、第一隔膜210和第二隔膜220能够使第一隔离段212形成稳定的内壳，从而具备较好的支撑，有效改善中心孔塌陷的问题。
可选地，双面胶的厚度为25μm-100μm。
在一个实施例中，请参照图1，第一极片110位于电极组件的内圈侧430。第一极片110的靠近卷绕终止侧420的一端未超出第一隔离段212的靠近卷绕终止侧420的一端；第二极片120的靠近卷绕终止侧420的一端超出第一隔膜210的靠近卷绕终止侧420的一端，且未超出第二隔膜220的靠近卷绕终止侧420的一端。
如此设置，能够使卷绕后的第一隔膜210、第二隔膜220、第一极片110和第二极片120均能够更好的收卷，从而得到结构更加紧凑的电极组件。
如图1所示的视角下，第一隔膜210的远离第二极片120的一侧为内圈侧430，第二隔膜220的远离第二极片120的一侧为外圈侧440，卷绕时，第一极片110位于内圈侧430的最内侧，第二隔膜220位于外圈侧440的最外侧。
在一个实施例中，请参照图2，第一极片110的宽度小于第二极片120 的宽度，第二极片120的宽度小于第一隔膜210的宽度。
如此设置，能够使第一隔膜210和第二隔膜220起到对第一极片110和第二极片120的有效隔离，避免第一极片110和第二极片120之间产生接触造成短路；同时，当第一极片110为正极极片，第二极片120为负极极片时，负极极片的边缘超出正极极片的边缘，能够使正极活性物质层上脱离的锂离子顺利嵌入至负极活性物质层上，从而避免在负极极片上出现析锂现象，进而避免了因隔膜被刺穿而引发的安全事故，提高了二次电池的电芯/电极组件的安全性。
如图2所示，第一极片110的宽度为W3，第二极片120的宽度为W4，第一极片110的宽度小于第二极片120的宽度，从而通过第一隔膜210和第二隔膜220实现更好的隔离作用。
另一方面，还提供了一种单体电池，包括如上述任一个实施例所述的电极组件。
该单体电池可以是锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，对此不做限定。该单体电池的形状可以是圆柱体、扁平体、长方体或其它形状等，对此也不做限定。
还提供了一种电池模组，包括至少一个如上述实施例所述的单体电池。
该电池模组可以包括两个或三个或四个单体电池等，以具备更大的电能输出能力。
该单体电池和电池模组均包括前述的电极组件，第一支撑段211能够卷绕至少一圈，并使支撑件的设置位置与第一支撑段211的位置对应，从而在提高卷绕后第一支撑段211的支撑能力，防止电极组件受到外力时导致中心孔塌陷，进而保证电池的正常供电，也提高电池的安全性。
另外，请参照图3，本实施例还提供了一种电极组件的制备方法，包括以下步骤：
将第一隔膜210和第二隔膜220夹在卷针上卷绕预设长度；
在第一隔膜210和第二隔膜220中的至少一者上设置支撑件并进行卷绕；
将第一极片110设在第一隔膜210的远离第二隔膜220的一侧，将第二极片120设在第一隔膜210和第二隔膜220之间；
将第一极片110、第一隔膜210、第二极片120和第二隔膜220卷绕。
该电极组件的制备方法能够应用于上述任一个实施例所述的电极组件的制备，首先空卷第一隔膜210和第二隔膜220，然后在第一隔膜210和第二隔膜220中的至少一者上设置支撑件，之后再卷入第一极片110和第二极片120，卷绕后的电极组件通过支撑件增强了中心孔的抗压强度，从而防止电极组件的中心孔塌陷。
可选地，第一隔膜210和第二隔膜220的预卷长度可以是绕卷针卷绕1-2圈。支撑件可以在第一隔膜210和第二隔膜220上均设置，第一隔膜210上设置的支撑件为第一支撑件310，第二隔膜220上设置的支撑件为第二支撑件320，且第一支撑件310和第二支撑件320均可以选择双面胶，第一支撑件310的相对两侧分别与第一隔膜210和第二隔膜220粘接，第二支撑件320与第二隔膜220的远离第一支撑件310的一侧粘接。如此设置，一方面便于支撑件的设置，另一方面也提高电极组件的抗压能力，防止中心孔受压后塌陷。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对申请专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准，说明书及附图可以用于解释权利要求的 内容。

Claims (13)

  1. 一种电极组件，包括：
    第一极片、第一隔膜、第二极片和第二隔膜，所述第一极片、所述第一隔膜、所述第二极片和所述第二隔膜依次层叠并卷绕设置；
    所述第一隔膜具有第一支撑段和第一隔离段，所述第一支撑段和所述第一隔离段沿所述第一隔膜的长度方向相邻设置，所述第一支撑段位于所述第一隔膜的靠近卷绕起始侧的位置，所述第一支撑段能够卷绕至少一圈；支撑件，所述支撑件设于所述第一隔膜的沿所述第一隔膜厚度方向的至少一侧或/和所述第二隔膜的沿所述第二隔膜厚度方向的至少一侧，且沿所述第一隔膜的厚度方向，所述支撑件在所述第一隔膜上的投影位于所述第一支撑段内，所述第一极片和所述第二极片在所述第一隔膜上的投影位于所述第一支撑段外，所述第一极片和所述第二极片均与所述支撑件间隔设置。
  2. 根据权利要求1所述的电极组件，其中，所述第一支撑段具有第一预卷区和第一支撑区，所述第一预卷区和所述第一支撑区沿所述第一隔膜的长度方向相邻设置，所述第一预卷区位于所述第一支撑段的靠近所述卷绕起始侧的位置，所述第一预卷区能够卷绕至少一圈；
    所述支撑件包括第一支撑件，沿所述第一隔膜的厚度方向，所述第一支撑件在所述第一隔膜上的投影位于所述第一支撑区内，且所述第一支撑件设在所述第一隔膜和所述第二隔膜之间。
  3. 根据权利要求2所述的电极组件，其中，所述支撑件还包括第二支撑件，所述第二支撑件位于所述第二隔膜的背离所述第一支撑件的一侧，沿所述第一隔膜的厚度方向，所述第二支撑件在所述第一隔膜上的投影与所述第一支撑件在所述第一隔膜上的投影至少部分重合。
  4. 根据权利要求3所述的电极组件，其中，所述第一支撑段还具有第一间隔区，所述第一间隔区位于所述第一支撑区的远离所述第一预卷区的一侧。
  5. 根据权利要求4所述的电极组件，其中，所述第一极片为正极极片， 所述第二极片为负极极片。
  6. 根据权利要求5所述的电极组件，其中，所述第一隔离段具有第二间隔区，所述第二间隔区位于所述第一隔离段的靠近所述卷绕起始侧的一端；
    所述第一极片的靠近所述卷绕起始侧的一端与所述第二隔离区的远离所述卷绕起始侧的一端对齐，所述第二极片的靠近所述卷绕起始侧的一端与所述第二隔离区的靠近所述卷绕起始侧的一端对齐。
  7. 根据权利要求3所述的电极组件，其中，所述第一支撑件沿所述第一隔膜的长度方向延伸设置，所述第一支撑件的宽度为所述第一隔膜的宽度的0.5倍以上1倍以下；
    或/和，所述第二支撑件沿所述第二隔膜的长度方向延伸设置，所述第二支撑件的宽度为所述第二隔膜的宽度的0.5倍以上1倍以下。
  8. 根据权利要求1-7任一项所述的电极组件，其中，所述支撑件为胶体，所述胶体粘接在所述第一隔膜或/和所述第二隔膜上。
  9. 根据权利要求8所述的电极组件，其中，所述第一极片位于所述电极组件的内圈侧；
    所述第一极片的靠近卷绕终止侧的一端未超出所述第一隔离段的靠近所述卷绕终止侧的一端；所述第二极片的靠近所述卷绕终止侧的一端超出所述第一隔膜的靠近所述卷绕终止侧的一端，且未超出所述第二隔膜的靠近所述卷绕终止侧的一端。
  10. 根据权利要求9所述的电极组件，其中，所述第一极片的宽度小于所述第二极片的宽度，所述第二极片的宽度小于所述第一隔膜的宽度。
  11. 一种单体电池，包括如权利要求1-10任一项所述的电极组件。
  12. 一种电池模组，包括至少一个如权利要求11所述的单体电池。
  13. 一种电极组件的制备方法，包括以下步骤：
    将第一隔膜和第二隔膜夹在卷针上卷绕预设长度；
    在第一隔膜和第二隔膜中的至少一者上设置支撑件并进行卷绕；
    将第一极片设在所述第一隔膜的远离所述第二隔膜的一侧，将第二极片设在所述第一隔膜和所述第二隔膜之间；
    将所述第一极片、所述第一隔膜、所述第二极片和所述第二隔膜卷绕。
PCT/CN2023/126999 2022-10-28 2023-10-27 电极组件、单体电池、电池模组及电极组件的制备方法 WO2024088367A1 (zh)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1713417A (zh) * 2004-06-25 2005-12-28 三星Sdi株式会社 电极组件和使用该电极组件的可再充电电池
CN105340122A (zh) * 2013-06-28 2016-02-17 日立汽车系统株式会社 扁平卷绕式二次电池
CN207074689U (zh) * 2017-06-20 2018-03-06 东莞市创明电池技术有限公司 电芯及锂电池
CN114335754A (zh) * 2021-12-24 2022-04-12 珠海冠宇电池股份有限公司 一种电池
KR20220092101A (ko) * 2020-12-24 2022-07-01 주식회사 엘지에너지솔루션 이차전지 및 이의 제조 방법
CN115513402A (zh) * 2022-10-28 2022-12-23 厦门海辰储能科技股份有限公司 电极组件、单体电池、电池模组及电极组件的制备方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204905342U (zh) * 2015-08-05 2015-12-23 天能电池集团有限公司 一种圆柱型锂离子电池极耳与使用该极耳的锂离子电池
CN107968182B (zh) * 2018-01-12 2023-12-15 宁德时代新能源科技股份有限公司 二次电池及汽车
CN210156503U (zh) * 2018-08-24 2020-03-17 惠州亿纬锂能股份有限公司 一种卷芯及锂离子电池
CN110770960A (zh) * 2018-09-30 2020-02-07 深圳市大疆创新科技有限公司 锂电芯、智能电池及锂电芯的制造方法
CN110190338A (zh) * 2018-12-22 2019-08-30 江苏时代新能源科技有限公司 电极组件和二次电池
CN112467231B (zh) * 2021-02-04 2021-09-14 江苏时代新能源科技有限公司 电极组件、电池单体、电池及电极组件的制造方法和设备
CN215644618U (zh) * 2021-05-31 2022-01-25 上海兰钧新能源科技有限公司 圆柱电芯、二次电池和汽车
CN216450704U (zh) * 2021-12-13 2022-05-06 宁德时代新能源科技股份有限公司 电极组件、电池单体、电池及用电设备

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1713417A (zh) * 2004-06-25 2005-12-28 三星Sdi株式会社 电极组件和使用该电极组件的可再充电电池
CN105340122A (zh) * 2013-06-28 2016-02-17 日立汽车系统株式会社 扁平卷绕式二次电池
CN207074689U (zh) * 2017-06-20 2018-03-06 东莞市创明电池技术有限公司 电芯及锂电池
KR20220092101A (ko) * 2020-12-24 2022-07-01 주식회사 엘지에너지솔루션 이차전지 및 이의 제조 방법
CN114335754A (zh) * 2021-12-24 2022-04-12 珠海冠宇电池股份有限公司 一种电池
CN115513402A (zh) * 2022-10-28 2022-12-23 厦门海辰储能科技股份有限公司 电极组件、单体电池、电池模组及电极组件的制备方法

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