WO2020078081A1 - 叠片电芯及其制作方法、锂电池 - Google Patents

叠片电芯及其制作方法、锂电池 Download PDF

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Publication number
WO2020078081A1
WO2020078081A1 PCT/CN2019/099759 CN2019099759W WO2020078081A1 WO 2020078081 A1 WO2020078081 A1 WO 2020078081A1 CN 2019099759 W CN2019099759 W CN 2019099759W WO 2020078081 A1 WO2020078081 A1 WO 2020078081A1
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WIPO (PCT)
Prior art keywords
electrode sheet
negative electrode
positive electrode
laminated cell
positive
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Ceased
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PCT/CN2019/099759
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English (en)
French (fr)
Inventor
王文华
蒋世用
钟宽
李影
李乾乾
段科
曾庆苑
何意
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Publication of WO2020078081A1 publication Critical patent/WO2020078081A1/zh
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • 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 disclosure relates to the technical field of lithium batteries, and in particular, to a laminated battery core, a manufacturing method thereof, and a lithium battery.
  • Laminated cells have many advantages and are widely used, such as: high energy density, discharge platform and volume specific capacity are higher than wound process batteries; not easy to deform; uniform internal structure, relatively uniform reaction rate; low internal resistance , Which is equivalent to multiple small pole pieces connected in parallel, which reduces the internal resistance; high rate discharge capacity is more, and multi-pole pieces connected in parallel are easier to complete large current discharge in a short time; pole pieces can have no flexibility.
  • the embodiments of the present disclosure provide a laminated cell and a manufacturing method thereof, and a lithium battery, which can reduce the production difficulty of the laminated cell.
  • a first aspect of an embodiment of the present disclosure provides a laminated cell, including:
  • the negative electrode sheet, the positive electrode sheet and the separator are of a strip-shaped structure.
  • the negative electrode sheet and the positive electrode sheet are alternately bent and stacked along their respective longitudinal directions, and the negative electrode sheet and the positive electrode sheet are separated by a separator.
  • the length direction of the negative electrode sheet and the length direction of the positive electrode sheet are disposed at an angle.
  • the length direction of the negative electrode sheet is perpendicular to the length direction of the positive electrode sheet.
  • the separator is provided with two pieces and has a belt-like structure. Both of the separators are consistent with the length direction of the negative electrode sheet, and are respectively attached to both sides of the negative electrode sheet in the thickness direction, and are bent along with the negative electrode sheet.
  • the separator is a belt-shaped structure, and the width of the separator is larger than the width of the negative electrode sheet.
  • both sides of the negative electrode sheet have continuous coating areas, and one side of the negative electrode sheet is provided with a first blank area.
  • the continuous coating area is used for coating negative electrode materials.
  • One end of the coating area along the longitudinal direction of the negative electrode sheet is used for setting a negative electrode ear.
  • the lamination cell is located on the outermost side in the lamination direction as a negative electrode sheet.
  • the inner side of the negative electrode sheet has a first continuous coating area and a first blank area, the continuous coating area is used to coat the negative electrode material, the first blank area is located along the negative electrode plate in the first continuous coating area One end of the length direction is used to set the negative ear.
  • the outer side of the negative electrode sheet has a second continuous coating area and a second blank area, the second continuous coating area is used to coat the negative electrode material, and the second continuous coating area is along the length of the negative electrode plate Both ends are provided with a second blank area, and the size of the second blank area along the length of the negative electrode sheet is consistent with the size of the single-folded negative electrode sheet.
  • both the inner and outer sides of the positive electrode sheet have a space coating area and a third blank area, the space coating area is used to coat the positive electrode material, and each blank area in the space coating area is located on the positive electrode At the bending place, the third blank area is located at one end of the positive electrode sheet along the length direction, and is used for setting the positive electrode ear.
  • the edge of the single coating area in the spaced coating area along the length of the positive electrode sheet does not exceed the edge of the negative electrode sheet in the width direction of itself.
  • the bent portion of the positive electrode sheet serves as a welding fixing position.
  • one of the side surfaces of the negative electrode sheet has a first blank area for setting the negative ear
  • one of the side surfaces of the positive electrode sheet has a third blank area for setting the positive ear.
  • the first blank area is provided along the width direction of the negative electrode sheet, and the third blank area is provided along the length direction of the positive electrode sheet, so that the extraction directions of the positive electrode ear and the negative electrode ear are the same; or
  • the first blank area is provided along the length direction of the negative electrode sheet, and the third blank area is provided along the width direction of the positive electrode sheet, so that the extraction directions of the positive electrode ear and the negative electrode ear are the same.
  • a third aspect of an embodiment of the present disclosure provides a lithium battery including the laminated cell of the above embodiment.
  • a third aspect of an embodiment of the present disclosure provides a method for manufacturing a laminated cell based on the foregoing embodiment, including:
  • the negative electrode sheet and the positive electrode sheet are alternately bent to form a laminated structure, and the separator is bent together with the electrode sheets having the same length direction, and the negative electrode sheet and the positive electrode sheet are separated by the separator.
  • the method for preparing a laminated cell before alternately bending the negative electrode sheet and the positive electrode sheet, the method for preparing a laminated cell further includes:
  • the two separators are respectively attached to both sides of the negative electrode in the thickness direction, and the longitudinal direction of the separator is consistent with the longitudinal direction of the negative electrode.
  • the step of alternately bending the negative electrode sheet and the positive electrode sheet to form a stacked structure includes:
  • the negative electrode and the positive electrode are vertically overlapped along their respective lengths, and the intersection is located at the end;
  • pole pieces located below are alternately bent toward the upper part of the other pole piece.
  • the method for preparing a laminated cell further includes:
  • the positive ear is welded to the third blank area of the positive electrode along the length of the positive electrode.
  • the method for preparing a laminated cell further includes:
  • the manufacturing method of the laminated cell further includes:
  • the positive electrode plates are vertically overlapped and arranged above the upper diaphragm, and the crossing position is located at the end;
  • the negative electrode sheet and the positive electrode sheet are both of a band structure, and are alternately bent and stacked.
  • This method of producing laminated cells does not require the electrode sheet to be cut, and the band structure is directly used to bend, which can avoid the occurrence of polar fragments and burrs, simplify the production process, the production process is easy to control, and the positive and negative plates are bent After folding, they are alternately laminated and pressed to play the role of fixing the electrode sheet, and it is not easy to deform during the process of transferring to the fixing process after the lamination is completed. Therefore, such a laminated cell can reduce the production difficulty and improve the pass rate of battery products.
  • FIG. 1 is a front view of an embodiment of a laminated cell of the present disclosure
  • FIG. 2 is a side view of an embodiment of a laminated cell of the present disclosure
  • 3A and 3B are schematic diagrams of the inside and outside of the negative electrode in the laminated cell of the present disclosure.
  • FIGS. 4A and 4B are schematic diagrams of the inside and outside of the positive electrode in the laminated cell of the present disclosure.
  • FIG. 5 is a schematic diagram of a diaphragm in a laminated cell of the present disclosure.
  • first and second appearing in this disclosure are for convenience of description only, to distinguish different component parts having the same name, and do not indicate a sequential or primary-secondary relationship.
  • orientation or positional relationship indicated by “upper”, “lower”, “top”, “bottom”, “front”, “back”, “inner”, and “outer” is used as the basis
  • the orientation or positional relationship shown in the drawings is only for the convenience of describing the present disclosure, and does not indicate or imply that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the scope of protection of the present disclosure .
  • the present disclosure provides a laminated cell.
  • it includes: a negative electrode sheet 1, a positive electrode sheet 2 and a separator 3, and the negative electrode sheet 1 and the positive electrode sheet 2 are both strip-shaped
  • the negative electrode sheet 1 and the positive electrode sheet 2 are alternately bent and stacked along their respective longitudinal directions, and the negative electrode sheet 1 and the positive electrode sheet 2 are separated by a separator 3.
  • the length direction is the extending direction of the band structure; after the negative electrode sheet 1 and the positive electrode sheet 2 are bent, the negative electrode sheet 1 and the positive electrode sheet 2 form an S shape along their respective longitudinal directions The extension direction of the bend.
  • this type of laminated core does not need to divide the electrode sheet, and directly adopts a band-shaped structure to bend, which can avoid the generation of pole fragments and burrs, which simplifies the production process and production process It is easy to control, and the positive and negative electrode pieces are alternately laminated and pressed after being bent, so that the positive and negative electrode pieces are staggered and fixed, and it is not easy to deform during the process of transferring to the fixing process after the lamination is completed. Therefore, while maintaining the advantages of conventional sliced laminated cells, such laminated cells can also reduce the production difficulty and improve the pass rate of battery products.
  • this type of laminated core does not show the phenomenon of inconsistent internal and external bending degrees, and the internal structure of the entire laminated core is unified.
  • the pole piece has good consistency, high flatness, and is not prone to deformation, so that the interface between the pole pieces is stable, the cycle performance is stable, and the internal reaction speed is relatively consistent.
  • the positive and negative electrode plates need not be stacked together, they are bent separately. During the ion circulation process in the battery, the electrode material coated on the positive and negative electrode plates is not prone to drop out in the bending area, so that The battery has high stability, good rate, cycle stability and high energy density.
  • the flatness of the cell is high, and the entire space can be fully utilized, which can increase the energy density of the cell.
  • the length direction of the negative electrode sheet 1 and the length direction of the positive electrode sheet 2 are disposed at an angle. In this way, after the negative electrode sheet 1 and the positive electrode sheet 2 are alternately bent, they can intersect each other in the entire length direction of the pole pieces, so that the pole pieces are mutually constrained in the length and width directions to play a limit fixing It is not easy to be deformed during the transfer to the fixing process after the lamination is completed, and it is also conducive to the subsequent welding process, which can further reduce the production difficulty and improve the pass rate of battery products.
  • the negative electrode sheet 1 and the positive electrode sheet 2 have the same length direction before being folded, and are arranged to overlap only at one end, so that cells that are alternately stacked on part of the length can also be formed.
  • the length direction of the negative electrode sheet 1 and the length direction of the positive electrode sheet 2 are perpendicular to each other.
  • the negative electrode sheet 1 and the positive electrode sheet 2 are both in the shape of a rectangular strip, it is easy to locate in the bending process, which is convenient for determining the bending position, and can ensure the alignment of the coating area after the negative electrode sheet 1 and the positive electrode sheet 2 are bent Quasi-property; moreover, this arrangement can form a rectangular parallelepiped laminated core and reduce the volume of the laminated core.
  • the separator 3 is provided with two pieces and has a belt-like structure, and the two separators 3 are consistent with the length direction of the negative electrode sheet 1 and are respectively attached to both sides of the negative electrode sheet 1 in the thickness direction, and Bend along with the negative electrode 1.
  • the separator 3 makes the negative electrode sheet 1 and the positive electrode sheet 2 non-conductive, and does not allow electrons to pass but only ions in the electrolyte.
  • the separator 3 may use a PP layer, a PE layer, or a composite layer of these two layers.
  • a ceramic layer may be coated on the separator 3.
  • the separator 3 may be attached to the positive electrode sheet 2.
  • the separator 3 is designed as a belt-shaped structure, which can be folded and laminated together with the pole pieces to simplify the production process, and the belt-shaped structure of the separator 3 is easy to cover the entire negative electrode sheet 1 to prevent the positive electrode sheet 2 and the negative electrode sheet 1 Conduction occurs between and improves the insulation performance of the battery cell.
  • separators 3 By providing separators 3 on both sides of the negative electrode sheet 1, both sides of the negative electrode sheet 1 can be separated from the positive electrode sheet 2 by the separator 3 during the process of bending the electrode sheet.
  • the width of the separator 3 is greater than the width of the negative electrode sheet 1 to ensure that the separator 3 can reliably cover the negative electrode sheet 1 and the positive electrode sheet 2 to prevent conduction and improve insulation reliability.
  • both sides of the negative electrode sheet 1 have a continuous coating area.
  • the continuous coating area is used for coating negative electrode materials.
  • One of the side surfaces of the negative electrode sheet 1 is provided with a first blank area 1B.
  • the region 1B is located at one end of the continuous coating region along the longitudinal direction of the negative electrode sheet 1 and is used for setting a negative electrode ear.
  • the negative electrode ear may be provided on either side of the negative electrode sheet 1.
  • the lamination cell is located on the outermost side in the lamination direction is the negative electrode sheet 1. Since the manufacturing cost of the positive electrode sheet 2 is relatively high, such a laminated cell can reduce the cost of the positive electrode sheet 2, thereby reducing the cost of the cell.
  • the inner surface of the negative electrode sheet 1 has a first continuous coating region 1A and a first blank region 1B.
  • the continuous coating region 1A is used for coating negative electrode materials and covers the entire width direction of the negative electrode sheet 1;
  • the first blank area 1B is located at one end of the negative electrode sheet 1 in the longitudinal direction, and is used to set a negative electrode ear extending in the width direction of the negative electrode sheet 1.
  • the width of the first blank region 1B may be the same as the width of the negative electrode ear. Capacity design.
  • the base of the negative electrode sheet 1 may use copper foil, and the coated negative electrode material may use a coating material in a conventional cell.
  • the continuous coating of negative electrode material can make the positive electrode sheet 2 have the negative electrode sheet 1 corresponding to it everywhere, and the negative electrode sheet 1 is not easy to be connected to the positive electrode sheet 2 at the bend, which improves the insulation of the laminated cell reliability.
  • the negative electrode ear can be pressed inside to prevent the occurrence of falling off.
  • the outer side of the negative electrode sheet 1 has a second continuous coating region 1C and a second blank region 1D.
  • the second continuous coating region 1C is used to coat the negative electrode material and covers the entire width of the negative electrode sheet 1.
  • the second continuous coating area 1C is provided with a second blank area 1D at both ends along the length of the negative electrode sheet 1, and the size of the second blank area 1D along the length of the negative electrode sheet 1 is bent with the negative electrode sheet 1 at a time The size is the same.
  • the second blank regions 1D are provided at both ends of the negative electrode sheet 1 to reduce the coating area of the negative electrode material to reduce costs , Can also reduce the thickness and weight of the battery.
  • both the inner and outer sides of the positive electrode sheet 2 have a space coating area 2A and a third blank area 2B.
  • the space coating area 2A is used to coat the positive electrode material, and each block in the space coating area 2A is coated.
  • the areas where the positive electrode material is distributed can be evenly spaced along the longitudinal direction of the positive electrode sheet 2, each blank area in the interval coating area 2A is located at the bend of the positive electrode sheet 2, and the third blank area 2B is located along the longitudinal direction of the positive electrode sheet 2
  • One end of the is used to set a positive electrode ear extending along the longitudinal direction of the positive electrode sheet 2.
  • the size of the third blank area 2B along the length of the positive electrode sheet 2 is consistent with the size of the positive electrode sheet 2 in a single bend
  • the width of the third blank area 2B is consistent with the width of the positive electrode ear
  • the width of the positive ear is designed according to the battery capacity .
  • the blank areas at both ends of the positive electrode sheet 2 are only the areas left after the positive electrode material is evenly coated, so that the positive electrode material covers the entire end more preferably.
  • the substrate of the positive electrode sheet 2 may use aluminum foil, and the coated positive electrode material may use a coating material in a conventional cell.
  • the positive electrode sheet 2 is coated at intervals, and there is no blank area on both sides, which can avoid the stress release of the film area and the exposed foil area on the leaking foil area of the full pole ear during rolling, and prevent the occurrence of Lithium analysis to improve battery life.
  • the positive electrode material is not coated at the bend of the positive electrode sheet 2, which can avoid the situation where the electrode sheet arching at the bend causes the material to drop and eventually leads to a reduction in the cycle performance of the cell; in addition, because the bend of the positive electrode sheet 2 is not Coated with positive electrode material, it can reduce the overall size of the battery compared to conventional batteries, which is convenient for installing the battery into the battery case, and the side with gaps between the positive and negative electrodes in the battery can face the battery.
  • the liquid injection hole is convenient for the injection and wetting of the electrolyte.
  • the positive tab extends along the length of the positive tab 2 and the negative tab extends along the width of the negative tab 1.
  • the vertical overlap arrangement can ensure that the positive and negative ears lead out in the same direction after forming the laminated cell.
  • the first blank area 1B can also be provided along the length of the negative electrode sheet 1
  • the third blank area 2B can be provided along the width direction of the positive electrode sheet 2. The negative electrode ears lead out in the same direction after forming the laminated cell.
  • the reserved welding points of the positive and negative ears may be arranged at the head, tail, middle or other positions of the pole pieces along the length direction.
  • the advantage of setting the reserved welding place of the pole lugs in the middle is that after the laminated core is formed, both the upper and lower pole pieces press the pole lugs, which can improve the firmness of the pole lugs.
  • the edge of the single coating area in the interval coating area 2A along the length of the positive electrode sheet 2 does not exceed the edge of the negative electrode sheet 1 along its width direction, so that the negative electrode sheet 1 can cover the positive electrode sheet 2, Make full use of the positive electrode sheet 2 to increase the battery capacity. If the gap is too large, it will also cause low battery energy utilization.
  • the bent portion of the positive electrode sheet 2 can be used as a welding fixed position because the positive electrode material is not coated. After the positive electrode sheet 2 is fixed, since the positive electrode sheet 2 and the negative electrode sheet 1 are alternately stacked, the stacked cell will be fixed as a whole.
  • the present disclosure also provides a lithium battery, including the laminated cell of the above embodiments, the laminated cell is placed in a case of the lithium battery.
  • the laminated cells are formed in a group, the side area where a gap is formed between the positive electrode sheet 2 and the negative electrode sheet 1 is upward, so as to increase the circulation channel of the electrolyte solution of the cell and accelerate the rate of electrolyte infiltration.
  • the lithium battery supported by this laminated cell has high stability, good rate, good cycle stability, and high energy density. The advantages will be specifically described below:
  • the internal resistance is low. It is equivalent to multiple small batteries connected in parallel, which reduces the internal resistance, which affects the cell rate performance and discharge platform to a certain extent.
  • Rate performance high rate discharge capacity is more. Multipolar plates are easier to complete large current discharge in a short time.
  • Discharge platform The discharge platform is high, the internal resistance is low and the polarization is small, so the discharge platform will be higher than the wound battery. For many electrical devices with high discharge cut-off voltage, the laminated core is the best choice.
  • volume energy density the side space is fully utilized, the thickness and bending degree are uniform everywhere, and the volume energy density is high.
  • the internal structure of the battery cell is uniform, and it is not easy to deform, the reaction speed is relatively consistent, and it can also be applied to a larger volume battery cell.
  • the tension between the pole pieces increases to a lesser degree, and it is not easy to cause deformation of the battery core and affect the interface stability.
  • the present disclosure also provides a method for manufacturing a laminated cell based on the above embodiment.
  • it includes:
  • Step 101 The negative electrode sheet 1 and the positive electrode sheet 2 are alternately bent to form a laminated structure, and the separator 3 is bent together with the pole pieces having the same length direction, and the negative electrode sheet 1 and the positive electrode sheet 2 are separated by the separator 3.
  • step 101 before step 101, it further includes:
  • Step 100 Provide two diaphragms 3;
  • step 100 ' the two separators 3 are respectively attached to both sides of the negative electrode sheet 1 in the thickness direction, and the longitudinal direction of the separator 3 is consistent with the longitudinal direction of the negative electrode sheet 1.
  • the step of bending the negative electrode sheet 1 and the positive electrode sheet 2 alternately to form a stacked structure in step 101 specifically includes:
  • Step 101A The negative electrode sheet 1 and the positive electrode sheet 2 are vertically overlapped along their respective longitudinal directions, and the crossing position is located at the end, including the head or tail of the pole piece;
  • Step 101B Bending the pole pieces in turn toward the upper part of the other pole piece alternately.
  • the manufacturing method of the laminated cell further includes:
  • Step 103 Weld the negative electrode ear to the first blank area 1B of the negative electrode sheet 1 along the width direction of the negative electrode sheet 1;
  • Step 104 Weld the positive electrode ear to the third blank area 2B of the positive electrode sheet 2 along the length direction of the positive electrode sheet 2.
  • the execution order of steps 103 and 104 is not limited.
  • the manufacturing method of the laminated cell further includes:
  • Step 105 Weld and fix the positive electrode sheet 2 at each bending point to play a role of fixing the winding core and form an integrated structure.
  • step 105 is performed after steps 103 and 104, which makes welding of the negative electrode ear and the positive electrode ear more convenient.
  • the manufacturing method of the laminated cell shown in FIGS. 1 and 2 includes:
  • Step 201 attaching the two separators 3 to both sides of the negative electrode sheet 1 in the thickness direction, and the length direction is consistent; in some embodiments, the length of the separator 3 and the negative electrode sheet 1 may also be consistent;
  • Step 202 The positive electrode sheet 2 is vertically overlapped and disposed above the upper separator 3, and the crossing position of the positive electrode sheet 2 and the negative electrode sheet 1 is located at one end;
  • Step 203 First bend the negative electrode sheet 1 together with the separator 3 upward to press the positive electrode sheet 2, and then bend the positive electrode sheet 2 upward to press the separator 3 above the negative electrode sheet 1, the positive electrode sheet 2 is spaced apart from each coating area 2A The blank area is located at the bend;
  • Step 204 the negative electrode sheet 1 and the positive electrode sheet 2 are alternately bent in turn until the entire length is bent.
  • each positive electrode sheet 2 corresponds to a negative electrode sheet 1 above and below, and is separated by a separator 3.
  • the upper and lower surfaces of each positive electrode sheet 2 form a negative electrode sheet 1 with the opposite negative electrode sheet 1.
  • Battery cells, so that each battery cell is arranged in parallel can reduce the internal resistance.
  • FIG. 1 after the negative electrode sheet 1 is bent, a continuous S-shaped structure is formed, and the bending positions on the left and right sides are the bending positions of the negative electrode sheet 1.
  • FIG. 2 after the positive electrode sheet 2 is bent, a continuous S-shaped structure is formed, and the bending positions on the left and right sides are the bending positions of the positive electrode sheet 2.

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Abstract

一种叠片电芯及其制作方法、锂电池，其中，叠片电芯包括负极片(1)、正极片(2)和隔膜(3)，负极片(1)和正极片(2)均为带状结构，负极片(1)和正极片(2)沿各自的长度方向交替弯折层叠设置，负极片(1)和正极片(2)之间均通过隔膜(3)隔开。此种生产叠片电芯的方式无需将电极片进行分切，直接采用带状结构弯折，可避免产生极片断面和毛刺，简化了生产工艺，生产过程容易控制，而且正负极片弯折后相互交替层叠压住，起到电极片固定的作用，在叠片完成后转移至固定工序的过程中不容易发生变形，由此可降低生产难度，并提高电池产品的合格率。

Description

叠片电芯及其制作方法、锂电池
本公开是以申请号为 201811208462.7，申请日为 2018年10月17日的中国申请为基础，并主张其优先权，该中国申请的公开内容在此作为整体引入本公开中。
技术领域
本公开涉及锂电池技术领域，尤其涉及一种叠片电芯及其制作方法、锂电池。
背景技术
目前，方形电池主要有卷绕及叠片工艺。叠片电芯具有诸多优点而得到广泛的应用，例如：能量密度高，放电平台和体积比容量都高于卷绕工艺电池；不容易变形；内部结构统一，反应速率相对一致；内阻较低，相当于多个小极片并联，降低了内阻；高倍率放电容量较多，多极片并联更容易在短时间内完成大电流放电；极片可以没有弹性。
但是，叠片电芯在生产时也有一些缺点，例如：(1)分切繁琐，合格率低。每个电池有几个小片，每个小片有四个切面，切片工艺又是易产生不良的冲切，因此对单个电池而言，产生极片断面、毛刺的概率大大增加。(2)生产控制复杂。(3)常规叠片完成后，因内部有很多小片，易在转移至焊接过程中变形。
发明内容
本公开的实施例提供了一种叠片电芯及其制作方法、锂电池，能够降低叠片电芯的生产难度。
本公开的实施例第一方面提供了一种叠片电芯，包括：
负极片、正极片和隔膜，负极片和正极片均为带状结构，负极片和正极片沿各自的长度方向交替弯折层叠设置，负极片和正极片之间均通过隔膜隔开。
在一些实施例中，负极片的长度方向和正极片的长度方向成角度设置。
在一些实施例中，负极片的长度方向和正极片的长度方向垂直设置。
在一些实施例中，隔膜设有两片且为带状结构，两片隔膜均与负极片的长度方向一致，分别贴合在负极片沿厚度方向的两侧，且随负极片弯折。
在一些实施例中，隔膜为带状结构，隔膜的宽度大于负极片的宽度。
在一些实施例中，负极片的两个侧面均具有连续涂布区域，负极片的其中一个侧面设有第一空白区域，连续涂布区域用于涂布负电极材料，第一空白区域位于连续涂布区域沿负极片的长度方向的一端，用于设置负极耳。
在一些实施例中，叠片电芯沿层叠方向位于最外侧的为负极片。
在一些实施例中，负极片的内侧面具有第一连续涂布区域和第一空白区域，连续涂布区域用于涂布负电极材料，第一空白区域位于第一连续涂布区域沿负极片的长度方向的一端，用于设置负极耳。
在一些实施例中，负极片的外侧面具有第二连续涂布区域和第二空白区域，第二连续涂布区域用于涂布负电极材料，第二连续涂布区域沿负极片的长度方向的两端均设有第二空白区域，第二空白区域沿负极片的长度方向的尺寸与负极片单次弯折的尺寸一致。
在一些实施例中，正极片的内外侧面均具有间隔涂布区域和第三空白区域，间隔涂布区域用于涂布正电极材料，间隔涂布区域中的的各空白区域均位于正极片的弯折处，第三空白区域位于正极片沿长度方向的一端，用于设置正极耳。
在一些实施例中，间隔涂布区域中单片涂布区域沿正极片长度方向的边缘不超过负极片沿自身宽度方向的边缘。
在一些实施例中，正极片的弯折处作为焊接固定位置。
在一些实施例中，负极片的其中一个侧面具有用于设置负极耳的第一空白区域，正极片的其中一个侧面具有用于设置正极耳的第三空白区域，
第一空白区域沿负极片的宽度方向设置，第三空白区域沿正极片的长度方向设置，以使正极耳和负极耳的引出方向相同；或者
第一空白区域沿负极片的长度方向设置，第三空白区域沿正极片的宽度方向设置，以使正极耳和负极耳的引出方向相同。
本公开的实施例第三方面提供了一种锂电池，包括上述实施例的叠片电芯。
本公开的实施例第三方面提供了一种基于上述实施例叠片电芯的制备方法，包括：
将负极片和正极片交替弯折形成层叠结构，隔膜随长度方向一致的极片一起弯折，并使负极片和正极片之间均通过隔膜隔开。
在一些实施例中，在将负极片和正极片交替弯折之前，叠片电芯制备方法还包括：
提供两片隔膜；
将两片隔膜分别贴合在负极片沿厚度方向的两侧，且隔膜的长度方向与负极片的长度方向一致。
在一些实施例中，将负极片和正极片交替弯折形成层叠结构的步骤包括：
将负极片和正极片沿各自的长度方向垂直交叠设置，且交叉位置位于端部；
依次将位于下方的极片交替朝向另一个极片的上部弯折。
在一些实施例中，在负极片和正极片交替弯折完毕后，叠片电芯制备方法还包括：
将负极耳沿负极片的宽度方向焊接在负极片的第一空白区域上；
将正极耳沿正极片的长度方向焊接在正极片的第三空白区域上。
在一些实施例中，在负极片和正极片交替弯折完毕后，叠片电芯制备方法还包括：
将正极片的各个弯折处进行焊接固定。
在一些实施例中，叠片电芯制作方法还包括：
将两片隔膜分别贴合在负极片沿厚度方向的两侧，且长度方向一致；
将正极片垂直交叠设置于上层隔膜的上方，且交叉位置位于端部；
先将负极片连同隔膜一起向上弯折压住正极片，再将正极片向上弯折压住负极片上方的隔膜，正极片上间隔涂布区域的各空白区域位于弯折处；
将负极片和正极片依次交替弯折。
本公开一些实施例的叠片电芯，负极片和正极片均为带状结构，且采用交替弯折层叠设置的方式。此种生产叠片电芯的方式无需将电极片进行分切，直接采用带状结构弯折，可避免产生极片断面和毛刺，简化了生产工艺，生产过程容易控制，而且正负极片弯折后相互交替层叠压住，起到电极片固定的作用，在叠片完成后转移至固定工序的过程中不容易发生变形。因此，此种叠片电芯可降低生产难度，并提高电池产品的合格率。
附图说明
此处所说明的附图用来提供对本公开的进一步理解，构成本申请的一部分，本公开的示意性实施例及其说明用于解释本公开，并不构成对本公开的不当限定。在附图中：
图1为本公开叠片电芯的一个实施例的主视图；
图2为本公开叠片电芯的一个实施例的侧视图；
图3A和图3B分别为本公开叠片电芯中负极片的内外侧示意图；
图4A和图4B分别为本公开叠片电芯中正极片的内外侧示意图；
图5为本公开叠片电芯中隔膜的示意图。
具体实施方式
以下详细说明本公开。在以下段落中，更为详细地限定了实施例的不同方面。如此限定的各方面可与任何其他的一个方面或多个方面组合，除非明确指出不可组合。尤其是，被认为是优选的或有利的任何特征可与其他一个或多个被认为是优选的或有利的特征组合。
本公开中出现的“第一”、“第二”等用语仅是为了方便描述，以区分具有相同名称的不同组成部件，并不表示先后或主次关系。
在本公开的描述中，采用了“上”、“下”、“顶”、“底”、“前”、“后”、“内”和“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开，而不是指示或暗示所指的装置必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开保护范围的限制。
如图1至图5所示，本公开提供了一种叠片电芯，在一些实施例中，包括：负极片1、正极片2和隔膜3，负极片1和正极片2均为带状结构，负极片1和正极片2沿各自的长度方向交替弯折层叠设置，负极片1和正极片2之间均通过隔膜3隔开。负极片1和正极片2在弯折之前，其长度方向为带状结构的延伸方向；负极片1和正极片2弯折之后，负极片1和正极片2沿各自的长度方向均形成S形等弯曲的延伸方向。
此种叠片电芯与常规的切片式叠片电芯相比，无需将电极片进行分切，直接采用带状结构弯折，可避免产生极片断面和毛刺，简化了生产工艺，生产过程容易控制，而且正负极片弯折后相互交替层叠压住，使正负极片交错固定，在叠片完成后转移至固定工序的过程中不容易发生变形。因此，此种叠片电芯在保持常规切片式叠片电芯优点的同时，还可降低生产难度，并提高电池产品的合格率。
此种叠片电芯与正负极片和隔膜重叠设置整体卷绕的电芯相比，其一，极片不会出现内外折弯程度不一致的现象，在整个叠片电芯内部结构统一，在高度方向上极片一致性较好，平整度高，不容易发生变形，使极片之间的界面稳定性高、循环性能稳定，内部反应速度相对一致。其二，由于正负极片无需层叠在一起，而是单独进行弯折，在电池内部离子循环过程中，正负极片上涂布的电极材料在弯折区域不容易产生 掉料的情况，使电池稳定性高、倍率性好、循环稳定性好、能量密度高。其三，电芯平整度高，整个空间能够完全利用，可提高电芯能量密度。
在一些实施例中，在弯折之前，负极片1的长度方向和正极片2的长度方向成角度设置。这样，负极片1和正极片2在交替弯折后，能够在极片的整个长度方向上都相互穿插交错，使极片之间在长度和宽度方向上均相互约束，以起到限位固定的作用，在叠片完成后转移至固定工序的过程中不容易发生变形，也有利于后续的焊接工序，可进一步降低生产难度，并提高电池产品的合格率。
可替代地，负极片1和正极片2在弯折前长度方向一致，只在一端重叠设置，这样也可形成在部分长度段上交替层叠的电芯。
在一些实施例中，如图1和图2所示，在弯折之前，负极片1的长度方向和正极片2的长度方向垂直设置。该实施例在负极片1和正极片2均为矩形带状结构时，在弯折过程中易于定位，方便确定弯折位置，可保证负极片1和正极片2弯折后涂布区域的对准性；而且，此种设置方式可形成长方体状的叠片电芯，减小叠片电芯的体积。
如图1和图5所示，隔膜3设有两片且为带状结构，两片隔膜3均与负极片1的长度方向一致，分别贴合在负极片1沿厚度方向的两侧，且随负极片1一起弯折。隔膜3可使负极片1和正极片2之间不导电，不允许电子通过只允许电解液中的离子通过。例如，隔膜3可采用PP层、PE层或者这两种层的复合层，在一些实施例中，还可以在隔膜3上涂布陶瓷层。可替代地，隔膜3也可与正极片2贴合。
该实施例将隔膜3设计为带状结构，可随极片一起弯折层叠，以简化生产工艺，而且带状结构的隔膜3易于将负极片1整体覆盖，防止正极片2与负极片1之间发生导通，提高电芯的绝缘性能。通过在负极片1的两侧均设置隔膜3，在极片弯折的过程中，负极片1的两个侧面均能通过隔膜3与正极片2隔开。
在一些实施例中，隔膜3的宽度大于负极片1的宽度，以保证隔膜3能可靠地覆盖住负极片1和正极片2，以防发生导通，提高绝缘可靠性。
在一些实施例中，负极片1的两个侧面均具有连续涂布区域，连续涂布区域用于涂布负电极材料，负极片1的其中一个侧面设有第一空白区域1B，第一空白区域1B位于连续涂布区域沿负极片1长度方向的一端，用于设置负极耳。负极耳可设在负极片1的任一侧面。
在一些实施例中，如图1和图2所示，叠片电芯沿层叠方向位于最外侧的为负极片1。由于正极片2的制作成本较高，此种叠片电芯可减小正极片2的成本，从而降 低电芯成本。
如图3A所示，负极片1的内侧面具有第一连续涂布区域1A和第一空白区域1B，连续涂布区域1A用于涂布负电极材料，覆盖了负极片1的整个宽度方向；第一空白区域1B位于负极片1沿长度方向的一端，用于设置沿负极片1宽度方向延伸的负极耳，第一空白区域1B的宽度可与负极耳的宽度一致，负极耳的宽度根据电池的容量设计。例如，负极片1的基体可采用铜箔，涂布的负电极材料可采用常规电芯中的涂布材料。
连续涂布负电极材料的方式能够使正极片2在各处都有负极片1与之对应，且负极片1在弯折处不容易与正极片2发生导通，提高叠片电芯的绝缘可靠性。而且，在负极片1内侧固定负极耳的方式能够将负极耳压在内侧，防止发生脱落。
如图3B所示，负极片1的外侧面具有第二连续涂布区域1C和第二空白区域1D，第二连续涂布区域1C用于涂布负电极材料，覆盖了负极片1的整个宽度方向；第二连续涂布区域1C沿负极片1的长度方向的两端均设有第二空白区域1D，第二空白区域1D沿负极片1的长度方向的尺寸与负极片1单次弯折的尺寸一致。
由于负极片1沿叠片高度方向的最外侧面不与正电极2配合，因此在负极片1的两端均设有第二空白区域1D可以减小负电极材料的涂布面积，以降低成本，还能减小电芯厚度和重量。
如图4A和4B所示，正极片2的内外侧面均具有间隔涂布区域2A和第三空白区域2B，间隔涂布区域2A用于涂布正电极材料，间隔涂布区域2A中各块涂布正电极材料的区域可沿正极片2的长度方向均匀间隔设置，间隔涂布区域2A中的各空白区域均位于正极片2的弯折处，第三空白区域2B位于正极片2沿长度方向的一端，用于设置沿正极片2长度方向延伸的正极耳。例如，第三空白区域2B的沿正极片2长度方向的尺寸与正极片2单次弯折的尺寸一致，第三空白区域2B的宽度与正极耳的宽度一致，正极耳的宽度根据电池容量设计。如图4A和4B，正极片2两端的空白区域只是正电极材料均匀间隔涂布后剩下的区域，更优地使正电极材料将整个端部覆盖。例如，正极片2的基体可采用铝箔，涂布的正电极材料可采用常规电芯中的涂布材料。
该实施例中的正极片2采用间隔涂布，两边不留空白区域的涂布极片，可避免辊压时膜区与露箔区对全极耳的漏箔区进行应力释放，并防止产生析锂现象，提高电池使用寿命。而且，在正极片2的弯折处不涂布正电极材料，可避免弯折处极片拱起引 起掉料最终导致电芯循环性能降低的情况；另外，由于正极片2的弯折处不涂布正电极材料，相比常规电芯来说可减小电芯的外形尺寸，便于将电芯装入电池壳体中，还可将电芯中正负极之间具有缝隙的一侧正对电池的注液孔，便于电解液的注入润湿。
如图3A和4A所示，正极耳沿正极片2的长度方向延伸，负极耳沿负极片1的宽度方向延伸，这种设置方式的目的在于，由于负极片1和正极片2在长度方向上垂直交叠设置，可保证正极耳和负极耳在形成叠片电芯后引出方向一致。除了上述实施例给出的极耳设置方式，也可使第一空白区域1B沿负极片1的长度方向设置，第三空白区域2B沿正极片2的宽度方向设置，最终也可使正极耳和负极耳在形成叠片电芯后引出方向一致。
预留的正极耳和负极耳的焊接处可设置在极片沿长度方向的头部、尾部、中间或其它位置。将预留的极耳焊接处设在中间位置的优点在于，在形成叠片电芯后，上下方均有极片压住极耳，可提高极耳固定的牢固性。
在一些实施例中，间隔涂布区域2A中单片涂布区域的沿正极片2长度方向的边缘不超过负极片1沿自身宽度方向的边缘，以使负极片1能够覆盖正极片2，以充分利用正极片2提高电池容量。如果间隙太大会也会造成电池能量利用率低。
在一些实施例中，正极片2的弯折处由于未涂布正电极材料，可作为焊接固定位置。正极片2固定后，由于正极片2与负极片1交替叠加设置，叠片电芯将整体固定。
其次，本公开还提供了一种锂电池，包括上述各实施例的叠片电芯，叠片电芯置于锂电池的壳体中。此种叠片电芯在成组时，正极片2与负极片1之间形成缝隙的侧面区域向上，以增加电芯电解液的流通通道，加快电解液的浸润速率。
采用此种叠片电芯支撑的锂电池稳定性高、倍率性好、循环稳定性好、能量密度高，下面将具体说明其优点：
(1)内阻：内阻较低。相当于多个小电池并联，降低了内阻，内阻在一定程度上影响电芯倍率性能和放电平台。
(2)倍率性能：高倍率放电容量较多。多极片更容易在短时间内完成大电流放电。
(3)放电平台：放电平台高，内阻较低极化较小，因而放电平台会高于卷绕电池，对于很多放电截止电压高的用电设备，选取叠片电芯最优。
(4)体积能量密度：侧边空间利用充分，各处厚度和弯折程度均匀，体积能量密度高。
(5)厚度变形：电芯内部结构统一，不容易发生变形，反应速度相对一致，也可适用于较大体积的电芯。在使用过程中，电芯经过数次放电后，极片厚度增加后，极片间的张力加大程度较小，不容易引起电芯变形而影响界面稳定性。
最后，本公开还提供了一种基于上述实施例叠片电芯的制作方法，在一个实施例中，包括：
步骤101、将负极片1和正极片2交替弯折形成层叠结构，隔膜3随长度方向一致的极片一起弯折，并使负极片1和正极片2之间均通过隔膜3隔开。
在一些实施例中，在步骤101之前，还包括：
步骤100、提供两片隔膜3；
步骤100’、将两片隔膜3分别贴合在负极片1沿厚度方向的两侧，且隔膜3的长度方向与负极片1的长度方向一致。
在一些实施例中，步骤101中将负极片1和正极片2交替弯折形成层叠结构的步骤具体包括：
步骤101A、将负极片1和正极片2沿各自的长度方向垂直交叠设置，且交叉位置位于端部，包括极片的头部或尾部；
步骤101B、依次将位于下方的极片交替朝向另一个极片的上部弯折。
在一些实施例中，在负极片1和正极片2交替弯折完毕后，此种叠片电芯的制作方法还包括：
步骤103、将负极耳沿负极片1的宽度方向焊接在负极片1的第一空白区域1B上；
步骤104、将正极耳沿正极片2的长度方向焊接在正极片2的第三空白区域2B上。其中，步骤103和104的执行顺序不受限制。
在一些实施例中，在负极片1和正极片2交替弯折完毕后，此种叠片电芯的制作方法还包括：
步骤105、将正极片2在各个弯折处焊接固定，起到固定卷芯的作用，形成一体结构。较优地，步骤105在步骤103和104之后执行，可使负极耳和正极耳的焊接更加方便。
在一个具体的实施例中，图1和图2所示叠片电芯的制作方法包括：
步骤201、将两片隔膜3分别贴合在负极片1沿厚度方向的两侧，且长度方向一致；在一些实施例中，隔膜3与负极片1的长度也可一致；
步骤202、将正极片2垂直交叠设置于上层隔膜3的上方，且正极片2与负极片 1的交叉位置位于一端；
步骤203、先将负极片1连同隔膜3一起向上弯折压住正极片2，再将正极片2向上弯折压住负极片1上方的隔膜3，正极片2上间隔涂布区域2A的各空白区域位于弯折处；
步骤204、负极片1和正极片2依次交替弯折，直至将整个长度弯折完毕。
如图1和图2所示，每一块正极片2的上下方均对应一块负极片1，且之间通过隔膜3隔开，每一块正极片2的上下表面均与相对的负极片1形成一个电池单元，这样各个电池单元并联设置可降低内阻。图1中负极片1弯折后形成连续的S形结构，左右两侧的弯折处均为负极片1的弯折处。图2中正极片2弯折后形成连续的S形结构，左右两侧的弯折处均为正极片2的弯折处。
以上对本公开所提供的一种叠片电芯及其制作方法、锂电池进行了详细介绍。本文中应用了具体的实施例对本公开的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本公开的方法及其核心思想。应当指出，对于本技术领域的普通技术人员来说，在不脱离本公开原理的前提下，还可以对本公开进行若干改进和修饰，这些改进和修饰也落入本公开权利要求的保护范围内。

Claims (20)

  1. 一种叠片电芯，包括：负极片(1)、正极片(2)和隔膜(3)，所述负极片(1)和正极片(2)均为带状结构，所述负极片(1)和正极片(2)沿各自的长度方向交替弯折层叠设置，所述负极片(1)和正极片(2)之间均通过所述隔膜(3)隔开。
  2. 根据权利要求1所述的叠片电芯，其中所述负极片(1)的长度方向和所述正极片(2)的长度方向成角度设置。
  3. 根据权利要求2所述的叠片电芯，其中所述负极片(1)的长度方向和正极片(2)的长度方向垂直设置。
  4. 根据权利要求1所述的叠片电芯，其中所述隔膜(3)设有两片且为带状结构，两片所述隔膜(3)均与所述负极片(1)的长度方向一致，分别贴合在所述负极片(1)沿厚度方向的两侧，且随所述负极片(1)弯折。
  5. 根据权利要求1所述的叠片电芯，其特征在于，所述隔膜(3)为带状结构，所述隔膜(3)的宽度大于所述负极片(1)的宽度。
  6. 根据权利要求1所述的叠片电芯，其中所述负极片(1)的两个侧面均具有连续涂布区域，所述负极片(1)的其中一个侧面设有第一空白区域(1B)，所述连续涂布区域用于涂布负电极材料，所述第一空白区域(1B)位于所述连续涂布区域沿所述负极片(1)的长度方向的一端，用于设置负极耳。
  7. 根据权利要求1所述的叠片电芯，其中所述叠片电芯沿层叠方向位于最外侧的为负极片(1)。
  8. 根据权利要求7所述的叠片电芯，其中所述负极片(1)的内侧面具有第一连续涂布区域(1A)和第一空白区域(1B)，所述连续涂布区域(1A)用于涂布负电极材料，所述第一空白区域(1B)位于所述第一连续涂布区域(1A)沿所述负极片(1)的长度方向的一端，用于设置负极耳。
  9. 根据权利要求7所述的叠片电芯，其中所述负极片(1)的外侧面具有第二连续涂布区域(1C)和第二空白区域(1D)，所述第二连续涂布区域(1C)用于涂布负电极材料，所述第二连续涂布区域(1C)沿所述负极片(1)的长度方向的两端均设有所述第二空白区域(1D)，所述第二空白区域(1D)沿所述负极片(1)的长度方向的尺寸与所述负极片(1)单次弯折的尺寸一致。
  10. 根据权利要求1所述的叠片电芯，其中所述正极片(2)的内外侧面均具有间隔涂布区域(2A)和第三空白区域(2B)，所述间隔涂布区域(2A)用于涂布正电极材料，所述间隔涂布区域(2A)中的的各空白区域均位于所述正极片(2)的弯折处，所述第三空白区域(2B)位于所述正极片(2)沿长度方向的一端，用于设置正极耳。
  11. 根据权利要求10所述的叠片电芯，其中所述间隔涂布区域(2A)中单片涂布区域沿所述正极片(2)长度方向的边缘不超过所述负极片(1)沿自身宽度方向的边缘。
  12. 根据权利要求10所述的叠片电芯，其中所述正极片(2)的弯折处作为焊接固定位置。
  13. 根据权利要求3所述的叠片电芯，其中所述负极片(1)的其中一个侧面具有用于设置负极耳的第一空白区域(1B)，所述正极片(2)的其中一个侧面具有用于设置正极耳的第三空白区域(2B)，
    所述第一空白区域(1B)沿所述负极片(1)的宽度方向设置，所述第三空白区域(2B)沿所述正极片(2)的长度方向设置，以使所述正极耳和所述负极耳的引出方向相同；或者
    所述第一空白区域(1B)沿所述负极片(1)的长度方向设置，所述第三空白区域(2B)沿所述正极片(2)的宽度方向设置，以使所述正极耳和所述负极耳的引出方向相同。
  14. 一种锂电池，包括权利要求1～13任一所述的叠片电芯。
  15. 一种基于权利要求1～13任一所述叠片电芯的制作方法，包括：
    将所述负极片(1)和正极片(2)交替弯折形成层叠结构，所述隔膜(3)随长度方向一致的极片一起弯折，并使所述负极片(1)和正极片(2)之间均通过所述隔膜(3)隔开。
  16. 根据权利要求15所述的叠片电芯制作方法，其中在将所述负极片(1)和正极片(2)交替弯折之前，还包括：
    提供两片隔膜(3)；
    将两片所述隔膜(3)分别贴合在所述负极片(1)沿厚度方向的两侧，且所述隔膜(3)的长度方向与所述负极片(1)的长度方向一致。
  17. 根据权利要求15所述的叠片电芯制作方法，其中将所述负极片(1)和正极 片(2)交替弯折形成层叠结构的步骤包括：
    将所述负极片(1)和正极片(2)沿各自的长度方向垂直交叠设置，且交叉位置位于端部；
    依次将位于下方的极片交替朝向另一个极片的上部弯折。
  18. 根据权利要求15所述的叠片电芯制作方法，其中在所述负极片(1)和正极片(2)交替弯折完毕后，还包括：
    将负极耳沿所述负极片(1)的宽度方向焊接在所述负极片(1)的第一空白区域(1B)上；
    将正极耳沿所述正极片(2)的长度方向焊接在所述正极片(2)的第三空白区域(2B)上。
  19. 根据权利要求15所述的叠片电芯制作方法，其中在所述负极片(1)和正极片(2)交替弯折完毕后，还包括：
    将所述正极片(2)的各个弯折处进行焊接固定。
  20. 根据权利要求15所述的叠片电芯制作方法，还包括：
    将两片所述隔膜(3)分别贴合在所述负极片(1)沿厚度方向的两侧，且长度方向一致；
    将所述正极片(2)垂直交叠设置于上层隔膜(3)的上方，且交叉位置位于端部；
    先将所述负极片(1)连同隔膜(3)一起向上弯折压住所述正极片(2)，再将所述正极片(2)向上弯折压住所述负极片(1)上方的隔膜(3)，所述正极片(2)上间隔涂布区域(2A)的各空白区域位于弯折处；
    将所述负极片(1)和正极片(2)依次交替弯折。
PCT/CN2019/099759 2018-10-17 2019-08-08 叠片电芯及其制作方法、锂电池 Ceased WO2020078081A1 (zh)

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