WO2019183865A1 - 一种电池电芯及其制备方法、电池、电子设备 - Google Patents

一种电池电芯及其制备方法、电池、电子设备 Download PDF

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Publication number
WO2019183865A1
WO2019183865A1 PCT/CN2018/080988 CN2018080988W WO2019183865A1 WO 2019183865 A1 WO2019183865 A1 WO 2019183865A1 CN 2018080988 W CN2018080988 W CN 2018080988W WO 2019183865 A1 WO2019183865 A1 WO 2019183865A1
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WO
WIPO (PCT)
Prior art keywords
electrode sheet
positive electrode
separator
negative electrode
battery cell
Prior art date
Application number
PCT/CN2018/080988
Other languages
English (en)
French (fr)
Inventor
余玉英
Original Assignee
深圳前海优容科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳前海优容科技有限公司 filed Critical 深圳前海优容科技有限公司
Priority to PCT/CN2018/080988 priority Critical patent/WO2019183865A1/zh
Publication of WO2019183865A1 publication Critical patent/WO2019183865A1/zh

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409Separators, membranes or diaphragms characterised by the material
    • H01M50/443Particulate material
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/489Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Definitions

  • the present invention relates to the field of battery technologies, and in particular, to a battery cell, a preparation method thereof, a battery, and an electronic device.
  • a positive electrode sheet, a separator, and a negative electrode sheet which are laminated are usually included.
  • the inventors of the present application found in the long-term research and development that the length and width of the negative electrode sheet in the battery are respectively greater than the length and width of the positive electrode sheet, and the length and width of the separator are respectively larger than the length and width of the negative electrode sheet, and the separator and the positive electrode sheet,
  • the negative electrode sheets need to be stacked separately, so that the positive electrode sheet, the separator and the negative electrode sheet stacking process all need different clamping fixtures, the alignment precision is high, the alignment times are many, and the stacking process is complicated.
  • the invention provides a battery cell, a preparation method thereof, a battery and an electronic device, so as to solve the technical problem that the separator, the positive electrode sheet and the negative electrode sheet are stacked separately in the prior art, the alignment precision is high, the alignment times are many, and the stacking process is complicated.
  • one technical solution adopted by the present invention is to provide a battery cell, which is formed by stacking a positive electrode sheet, a separator and a negative electrode sheet, and the separator is integrally formed on the positive electrode sheet and/or Or at least one side of the negative electrode sheet for isolating the positive electrode sheet and the negative electrode sheet.
  • another technical solution adopted by the present invention is to provide a battery including the battery cell described above.
  • another technical solution adopted by the present invention is to provide an electronic device including the above battery.
  • another technical solution adopted by the present invention is to provide a method for preparing a battery cell, including:
  • the positive electrode sheet, the separator, and the negative electrode sheet Forming the positive electrode sheet, the separator, and the negative electrode sheet to form the battery cell, wherein the positive electrode sheet and/or the separator of at least one side of the negative electrode sheet are correspondingly disposed on the positive electrode sheet and the Between the negative electrode sheets.
  • the present invention can reduce the number of alignments of the positive electrode sheet, the separator and the negative electrode sheet by integrally molding the separator on at least one side of the positive electrode sheet and/or the negative electrode sheet, and simplifies the preparation process of the battery.
  • FIG. 1 is a schematic structural view of an embodiment of a battery cell of the present invention.
  • FIG. 2 is a schematic exploded view showing an embodiment of a battery cell of the present invention
  • FIG. 3 is a schematic structural view of a diaphragm in an embodiment of a battery cell of the present invention.
  • FIG. 4 is a bottom plan view showing an embodiment of a battery cell of the present invention.
  • Figure 5 is a schematic exploded view showing another embodiment of the battery cell of the present invention.
  • FIG. 6 is a schematic structural view of another embodiment of a battery cell of the present invention.
  • Figure 7 is a schematic exploded view showing another embodiment of the battery cell of the present invention.
  • FIG. 8 is a schematic structural view of another embodiment of a battery cell of the present invention.
  • FIG. 9 is a schematic structural view of another embodiment of a battery cell of the present invention.
  • Figure 10 is a schematic exploded view showing another embodiment of the battery cell of the present invention.
  • Figure 11 is a schematic exploded view showing another embodiment of the battery cell of the present invention.
  • Figure 12 is a schematic exploded view showing another embodiment of the battery cell of the present invention.
  • FIG. 13 is a schematic flow chart of an embodiment of a method for preparing a battery cell of the present invention.
  • FIG. 14 is a schematic flow chart of an embodiment of a method for preparing a battery cell of the present invention.
  • 15 is a schematic flow chart of another embodiment of a method for preparing a battery cell of the present invention.
  • Figure 16 is a schematic structural view of an embodiment of a battery of the present invention.
  • 17 is a schematic structural view of an embodiment of an electronic device of the present invention.
  • the battery cell is formed by stacking a positive electrode sheet 102, a separator 1022 and a negative electrode sheet 104, wherein the separator 1022 is integrally formed on at least the positive electrode sheet 102 and/or the negative electrode sheet 104.
  • One side is used to isolate the positive electrode tab 102 and the negative electrode tab 104.
  • the length and/or width of the separator is greater than or equal to the length and/or width of the negative electrode sheet 104.
  • the separator 1022 is integrally formed on the side of the positive electrode tab 102 adjacent to the negative electrode tab 104 to isolate the positive electrode tab 102 and the negative electrode tab 104.
  • the length and width of the negative electrode sheet 104 are respectively larger than the length d1 and the width d2 of the positive electrode sheet 102, and the length d3 and the width d4 of the separator 1022 are respectively larger than the length and width of the negative electrode sheet 104, so as to avoid direct contact between the positive electrode sheet 102 and the negative electrode sheet 104 to cause a short circuit. .
  • the negative electrode 104 is aligned with the positive electrode 102, and the diaphragm 1022 does not need to be aligned.
  • the diaphragm is translucent, and the contour of the positive electrode can be displayed by the illumination of the light to facilitate the negative electrode.
  • 104 is aligned with the positive electrode tab 102.
  • the separator 1022 can be aligned with the positive electrode sheet 102 when the separator 1022 is integrally formed on the positive electrode sheet 102 such that the negative electrode sheet 104 is aligned with the positive electrode sheet 102, that is, aligned with the separator 1022.
  • the negative electrode tab 104 is disposed in alignment with the separator 1022 integrally formed on the positive electrode tab 102, and it is not necessary to align the positive electrode tab 102.
  • the separator may also be integrally formed on the side of the negative electrode tab 104 adjacent to the positive electrode tab 102 to isolate the positive electrode tab 102 and the negative electrode tab 104.
  • the positive electrode sheet 102 is disposed in alignment with the negative electrode sheet 104, or the positive electrode sheet 102 is aligned with the separator 1022 integrally formed on the negative electrode sheet 104.
  • the diaphragm 1022 includes a first connecting layer 1022a, an insulating layer 1022b, and a second connecting layer 1022c, which are sequentially stacked, wherein the first connecting layer 1022a and the second connecting layer 1022c may both be PVDF.
  • the insulating layer 1022b may be made of an oxide ceramic material having an oxide particle diameter of less than 50 nm, such as magnesium oxide, Zirconium oxide, aluminum oxide, boehmite, calcium oxide, etc., the oxide ceramic material has good heat resistance, and it is difficult to change the physical and chemical properties of the positive and negative electrode sheets due to heat generation.
  • the membrane 1022 can also be a single layer of insulating layer such as magnesium oxide, zirconia, alumina, boehmite, calcium oxide, and the like.
  • the separator by integrally molding the separator on one side of the positive electrode sheet or the negative electrode sheet, the number of times of alignment of the positive electrode sheet, the separator and the negative electrode sheet can be reduced, and the preparation process of the battery can be simplified.
  • another embodiment of the battery cell of the present invention comprises a positive electrode sheet 102, a negative electrode sheet 104 and a separator, wherein the negative electrode sheet 104 is disposed on the positive electrode sheet 102; and the separator is integrally formed on the positive electrode sheet 102 near the negative electrode sheet 104, respectively.
  • the one side, and the side of the negative electrode tab 104 adjacent to the positive electrode tab 102 are used to isolate the positive electrode tab 102 and the negative electrode tab 104.
  • the length and width of the negative electrode sheet 104 are respectively greater than the length and width of the positive electrode sheet 102, and the length and width of the separator 1022 on the positive electrode sheet 102 are respectively greater than the length and width of the positive electrode sheet 102, and the length of the separator 1042 on the negative electrode sheet 104 is The width is greater than the length and width of the negative electrode tab 104, respectively.
  • the negative electrode 104 is aligned with the positive electrode 102, and the separator 1022 does not need to be aligned; or the negative electrode 104 is aligned with the separator 1022 integrally formed on the positive electrode 102, and the positive electrode 102 does not need to be aligned; or the negative electrode
  • the diaphragm 1042 on the 104 is aligned with the diaphragm 1022 on the positive electrode tab 102.
  • the separator 1022 on the positive electrode sheet 102 includes a first connecting layer 1022a, an insulating layer 1022b, and a second connecting layer 1022c which are sequentially stacked, and a separator 1042 and a positive electrode sheet 102 on the negative electrode sheet 104.
  • the separator 1022 has the same structure, in which the second connection layer 1022c of the separator 1022 on the positive electrode sheet 102 and the second connection layer (not shown) of the separator 1042 on the negative electrode sheet 104 are well bonded, so that the positive electrode sheet 102 is provided. It is tightly bonded to the negative electrode tab 104.
  • the separator by integrally forming the separator on the opposite side of the positive electrode sheet and the negative electrode sheet, the number of alignments of the positive electrode sheet, the separator and the negative electrode sheet can be reduced, and the preparation process of the battery can be simplified.
  • another embodiment of the battery cell of the present invention comprises a positive electrode sheet 202, a negative electrode sheet 204 and a separator 2022, wherein the negative electrode sheet 204 is disposed on the positive electrode sheet 202; the separator 2022 is integrally formed on the positive electrode sheet 202 near the negative electrode.
  • One side of the sheet 204 is used to isolate the positive electrode tab 202 and the negative electrode tab 204.
  • the length and width of the separator 2022 and the length and width of the positive electrode sheet 202 are equal to the length and width of the negative electrode tab 204, respectively.
  • the negative electrode tab 204 When the battery is assembled, the negative electrode tab 204 is aligned with the separator 2022 integrally formed on the positive electrode tab 202, and it is not necessary to align the positive electrode tab 202, and since the length and width of the separator 2022 are equal to the length and width of the negative electrode tab 204, the separator is made The alignment of 2022 with the negative electrode tab 204 is simpler.
  • the separator 2022 may be a single insulating layer, or may include a first connecting layer, an insulating layer and a second connecting layer which are sequentially stacked, so that the separator 2022 is separated from the positive electrode tab 202 and the negative electrode tab 204.
  • the combination with the positive electrode sheet 202 and the negative electrode sheet 204 is tight.
  • another embodiment of the battery cell of the present invention comprises a positive electrode sheet 202, a negative electrode sheet 204 and a separator, wherein the negative electrode sheet 204 is disposed on the positive electrode sheet 202; and the separator is integrally formed on the positive electrode sheet 202 near the negative electrode sheet 204, respectively.
  • the one side, and the side of the negative electrode plate 204 adjacent to the positive electrode tab 202 are used to isolate the positive electrode tab 202 and the negative electrode tab 204.
  • the length and width of the separator 2022 on the positive electrode sheet 202 are equal to the length and width of the positive electrode sheet 202, respectively, and the length and width of the separator 2042 on the negative electrode sheet 204 are equal to the length and width of the negative electrode sheet 204, respectively.
  • the length and width of the diaphragm 2042 are equal.
  • the separator 2042 on the negative electrode tab 204 is aligned with the separator 2022 on the positive electrode tab 202, and since the length and width of the separator 2022 on the positive electrode tab 202 are equal to the length and width of the separator 2042 on the negative electrode tab 204, Make alignment assembly easier.
  • the separator by integrally molding the separator on one side of the positive electrode sheet and/or the negative electrode sheet, the number of times of alignment of the positive electrode sheet, the separator and the negative electrode sheet can be reduced, and the preparation process of the battery can be simplified.
  • Another embodiment of the battery cell of the present invention comprises a plurality of positive electrode sheets, a plurality of negative electrode sheets and a plurality of separators.
  • the positive electrode sheet of the surface portion of the battery cell is integrally formed with a separator on a side close to the negative electrode sheet, and the middle portion of the battery cell includes two A positive electrode sheet having a separator integrally formed on the side.
  • the battery cell includes a first positive electrode sheet 302, a first negative electrode sheet 3042, a second positive electrode sheet 306, a second negative electrode sheet 3044, and a separator which are sequentially stacked; wherein, the surface portion of the battery cell A separator 3022 is integrally formed on a side of the positive electrode sheet 302 adjacent to the first negative electrode sheet 3042, and a positive electrode sheet in the middle portion of the battery cell, that is, a separator 3062, 3064 is integrally formed on both sides of the second positive electrode sheet 306 for isolating the positive electrode.
  • the positive electrode sheet of the middle portion of the battery cell has only one piece.
  • the number of positive electrode sheets in the middle portion may be two or more, and the number of positive electrode sheets in the middle portion is two.
  • the positive electrode sheet of the intermediate portion may have a portion integrally formed with a separator only on one side of the positive electrode sheet, and the other side of the separator may be integrally formed on the negative electrode sheet.
  • the length and width of the separator 3022 of the first positive electrode sheet 302 and the separator 3062, 3064 of the second positive electrode sheet 306 are greater than the length and width of the first negative electrode sheet 3042 and the second negative electrode sheet 3044 to avoid direct and positive electrode sheets. Contact caused a short circuit.
  • the negative electrode tab is aligned with the positive electrode tab.
  • the diaphragm is translucent, and the contour shadow of the positive electrode tab can be displayed by the irradiation of light to facilitate alignment of the negative electrode tab 304 with the positive electrode tab 302; or the negative electrode
  • the sheet is aligned with the diaphragm integrally formed on the positive electrode sheet.
  • Another embodiment of the battery cell of the present invention comprises a plurality of positive electrode sheets, a plurality of negative electrode sheets and a plurality of separators, wherein a negative electrode sheet on a surface portion of the battery cell is integrally formed with a separator on a side close to the positive electrode sheet, and a middle portion of the battery cell includes two A negative electrode sheet having a separator integrally formed on the side.
  • the battery cell includes a first negative electrode tab 402, a first positive electrode tab 4042, a second negative electrode tab 406, a second positive electrode tab 4044, and a separator disposed in a stack; wherein the first negative electrode tab of the surface portion of the battery cell A separator 4022 is integrally formed on a side of the first positive electrode sheet 4042, and a separator 4062 is formed integrally on both sides of the negative electrode sheet of the battery cell, that is, the second negative electrode sheet 406, for isolating the positive electrode and the negative electrode, respectively.
  • the negative electrode sheet in the middle portion of the battery cell has only one piece.
  • the number of negative electrode sheets in the middle portion may be two or more, and when the number of negative electrode sheets in the middle portion is two or more.
  • the negative electrode sheet in the middle portion may have a portion in which a separator is integrally formed only on one side of the negative electrode sheet, and the separator on the other side is integrally formed on the positive electrode sheet.
  • the positive electrode tab is arranged in alignment with the negative electrode tab.
  • the diaphragm is translucent, and the contour shadow of the negative electrode tab can be displayed by the irradiation of light to facilitate alignment of the negative electrode tab with the positive electrode tab; or the positive electrode tab and the positive electrode tab are The separator integrally formed on the negative electrode sheet is aligned.
  • the battery cell includes a first positive electrode sheet 502, a first negative electrode sheet 504, a second positive electrode sheet 506, a second negative electrode sheet 508, and a separator disposed in a stack; wherein, the first negative electrode sheet 504 and the second positive electrode sheet
  • the 506 and the second negative electrode tab 508 are integrally formed with the separators 5042, 5062 and 5082 on the side close to the first positive electrode tab 502 for isolating the lower pole piece, and the first positive electrode tab 502 of the surface portion of the battery cell is not provided with a diaphragm. .
  • the positive electrode and the negative electrode are respectively arranged in alignment.
  • the diaphragm is translucent, and the contour shadow of the positive electrode can be displayed by the irradiation of light, so that the negative electrode is aligned with the positive electrode or passes through the light. Irradiation shows the contour shading of the negative electrode sheet to facilitate alignment of the positive electrode sheet with the negative electrode sheet; or the positive/negative electrode sheet is aligned with the separator integrally formed on the negative/positive electrode sheet.
  • the length and width of the positive electrode sheet, the separator, and the negative electrode sheet may be equal, respectively. Since the length and width of the positive electrode sheet, the separator and the negative electrode sheet are equal, the alignment assembly of the positive electrode sheet and the negative electrode sheet is simpler.
  • the separator by integrally molding the separator on at least one side of the positive electrode sheet and/or the negative electrode sheet, the number of times of alignment of the positive electrode sheet, the separator and the negative electrode sheet can be reduced, and the preparation process of the battery can be simplified.
  • an embodiment of a method for manufacturing a battery cell of the present invention includes:
  • the positive electrode sheet 102, the separator 1022, and the negative electrode sheet 104 are laminated to form a battery cell, wherein the separator of at least one side of the positive electrode sheet 102 and/or the negative electrode sheet 104 is disposed between the positive electrode sheet 102 and the negative electrode sheet 104.
  • the method further includes: integrally forming a separator on at least one side of the positive electrode sheet 102 and/or the negative electrode sheet 104.
  • the integrated formation of the membrane 1022 on at least one side of the positive electrode sheet 102 and/or the negative electrode sheet 104 specifically includes:
  • first connection layer 1022a, the insulating layer 1022b, and the second connection layer 1022c may be directly compounded or compounded by industrial glue or the like.
  • the separator 1022 is composited to at least one side of the positive electrode sheet 102 and/or the negative electrode sheet 104.
  • the first connecting layer 1022a and the second connecting layer 1022c may be made of PVDF, PMMA or the like, and have good bonding property with the positive electrode tab 102 and the negative electrode tab 104, and the first connecting layer 1022a and the second connecting layer are connected.
  • the layer 1022c may be composited with the positive electrode tab 102 and the negative electrode tab 104, respectively.
  • the insulating layer 1022b may be made of an oxide ceramic material having an oxide particle diameter of less than 50 nm, such as magnesium oxide, zirconium oxide, aluminum oxide, boehmite, calcium oxide, etc., and the oxide ceramic material has good heat resistance and is not easy to be positive.
  • the negative electrode sheet heats up to change its physical and chemical properties.
  • the separator 1022 is integrally formed on at least one side of the positive electrode sheet 102, and the positive electrode sheet 102, the separator 1022 and the negative electrode sheet 104 are laminated to form a battery cell, and the negative electrode sheet 104 can be directly compounded to the separator 1022.
  • Two connection layers 1022c When the negative electrode sheet 104 is combined with the second connecting layer 1022c, the negative electrode sheet 104 is aligned with the positive electrode sheet 102, and the positive electrode sheet 102, the separator 1022, and the negative electrode sheet 104 are laminated to form a battery cell, for example, the center of the negative electrode sheet 104 and the positive electrode sheet 102.
  • the center i.e., the center of the second connecting layer 1022c
  • the negative electrode sheet 104 is aligned with the separator integrally formed on the positive electrode sheet 102, and the positive electrode sheet 102, the separator 1022, and the negative electrode sheet 104 are laminated.
  • Forming the battery cells for example, aligning the center of the negative electrode tab 104 with the center of the diaphragm 1022, and eliminating the need to align with the positive electrode tab 102, can complete the stacking of the batteries.
  • the separator is integrally formed on at least one side of the negative electrode sheet, and the positive electrode sheet 102 and the negative electrode sheet are laminated to form a battery cell, the positive electrode sheet 102 is aligned with the negative electrode sheet 104, or the positive electrode sheet is integrally formed with The separator on the positive electrode sheet 102 is aligned, and the positive electrode sheet 102, the separator 1022, and the negative electrode sheet 104 are laminated to form a battery cell.
  • the separator is integrally formed on at least one side of the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet, the separator, and the negative electrode sheet are laminated to form a battery cell, and the separator on the negative electrode sheet and the separator on the positive electrode sheet are aligned to each other.
  • the sheet, separator and negative electrode sheets are laminated to form a battery cell.
  • the membrane 1022 can also be a single layer of insulating layer such as magnesium oxide, zirconia, alumina, boehmite, calcium oxide, and the like.
  • the width of the negative electrode tab 104 is larger than the width of the positive electrode tab 102.
  • the length and width of the negative electrode tab 104 may be equal to the length and width of the positive electrode tab 102 such that the positive electrode tab 102 and the negative electrode tab 104 may use the same clamp during the stacking process and are easily aligned for battery assembly. The process is simple.
  • FIG. 1 , FIG. 3 and FIG. 15 another embodiment of a method for preparing a battery cell of the present invention includes:
  • S901 providing a positive electrode sheet 102, a negative electrode sheet 104 and a separator 1022, wherein the separator is integrally formed on at least one side of the positive electrode sheet 102 and/or the negative electrode sheet 104 for isolating the positive electrode sheet 102 and the negative electrode sheet 104;
  • the method further includes: integrally forming a separator on at least one side of the positive electrode sheet 102 and/or the negative electrode sheet 104.
  • the method includes: S900, sequentially coating a first connection layer 1022a, an insulation layer 1022b, and a second connection layer 1022c on at least one side of the positive electrode sheet 102 and/or the negative electrode sheet 104 to form a separator;
  • 1 ⁇ m (micrometer) of PVDF may be coated on the positive electrode sheet 102 as the first connection layer 1022a, and 1 ⁇ m of magnesium oxide is coated on the first connection layer 1022a as the insulating layer 1022b on the insulating layer 1022b. 1 ⁇ m of PVDF was applied as a second tie layer.
  • the thickness of the first connection layer 1022a, the insulating layer 1022b, and the second connection layer 1022c may also be 0.8 ⁇ m, 1.2 ⁇ m, or 1.5 ⁇ m, or the like.
  • the first connection layer 1022a and the second connection layer 1022c may also be PMMA, and the insulating layer 1022b may also be zirconia, alumina, boehmite, calcium oxide or the like.
  • the separator by integrally molding the separator on at least one side of the positive electrode sheet and/or the negative electrode sheet, the number of times of alignment of the positive electrode sheet, the separator and the negative electrode sheet can be reduced, and the preparation process of the battery can be simplified.
  • the battery cell embodiment of the present invention includes a battery cell 2002. Specifically, the structure of the cell is referred to the battery cell embodiment described above, and details are not described herein again.
  • the separator by integrally molding the separator on at least one side of the positive electrode sheet and/or the negative electrode sheet, the number of times of alignment of the positive electrode sheet, the separator and the negative electrode sheet can be reduced, and the preparation process of the battery can be simplified.
  • an embodiment of the electronic device 300 of the present invention includes a battery 3002. Specifically, the structure of the battery 2002 is described in the above battery embodiment, and details are not described herein again.
  • the separator by integrally molding the separator on at least one side of the positive electrode sheet and/or the negative electrode sheet, the number of times of alignment of the positive electrode sheet, the separator and the negative electrode sheet can be reduced, and the preparation process of the battery can be simplified.

Abstract

本发明公开了一种电池电芯及其制备方法、电池、电子设备,电池电芯由正极片、隔膜和负极片叠加而成,隔膜一体成形于正极片和/或负极片的至少一侧,用于隔离正极片和负极片。本发明通过将隔膜一体成形于正极片和/或负极片的至少一侧,能够减少正极片、隔膜和负极片的对齐次数,简化电池的制备过程。

Description

一种电池电芯及其制备方法、电池、电子设备
【技术领域】
本发明涉及电池技术领域,特别涉及一种电池电芯及其制备方法、电池、电子设备。
【背景技术】
随着手机、笔记本电脑、数码相机等小型电子产品和电动汽车、电动工具等能源动力产品的发展,电池的应用也越来越广泛。现有的电池中,通常包括层叠设置的正极片、隔膜、负极片。在制备过程中,通常需要先将正极片、隔膜和负极片切割成小块,再依次层叠设置。
本申请的发明人在长期的研发中发现,电池中负极片的长度和宽度分别大于正极片的长度和宽度,隔膜的长度和宽度又分别大于负极片的长度和宽度,而隔膜与正极片、负极片需要分别堆叠,使得正极片、隔膜和负极片堆叠过程都需要采用不同的夹具,对齐精度要求高,对齐次数多,堆叠过程复杂。
【发明内容】
本发明提供一种电池电芯及其制备方法、电池、电子设备,以解决现有技术中隔膜与正极片、负极片分别堆叠,对齐精度要求高,对齐次数多,堆叠过程复杂的技术问题。
为解决上述技术问题,本发明采用的一个技术方案是提供一种电池电芯,所述电池电芯由正极片、隔膜和负极片叠加而成,所述隔膜一体成形于所述正极片和/或所述负极片的至少一侧,用于隔离所述正极片和所述负极片。
为解决上述技术问题,本发明采用的另一个技术方案是提供一种电池,所述电池包括上述的电池电芯。
为解决上述技术问题,本发明采用的另一个技术方案是提供一种电子设备,所述电子设备包括上述的电池。
为解决上述技术问题,本发明采用的另一个技术方案是提供一种电池电芯的制备方法,包括:
提供正极片、负极片和隔膜,其中所述隔膜一体成形于所述正极片和/或所述负极片的至少一侧,用于隔离所述正极片和所述负极片;
将所述正极片、所述隔膜和所述负极片层叠形成所述电池电芯,其中所述正极片和/或所述负极片的至少一侧的隔膜对应设置于所述正极片与所述负极片之间。
本发明通过将隔膜一体成形于正极片和/或负极片的至少一侧,能够减少正极片、隔膜和负极片的对齐次数,简化电池的制备过程。
【附图说明】
为了更清楚地说明本发明实施例中的技术方案,下面将对实施例描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图,其中:
图1是本发明电池电芯一实施例的结构示意图;
图2是本发明电池电芯一实施例的结构分解示意图;
图3是本发明电池电芯一实施例中隔膜的结构示意图;
图4是本发明电池电芯一实施例的仰视结构示意图;
图5是本发明电池电芯另一实施例的结构分解示意图;
图6是本发明电池电芯另一实施例的结构示意图;
图7是本发明电池电芯另一实施例的结构分解示意图;
图8是本发明电池电芯另一实施例的结构示意图;
图9是本发明电池电芯另一实施例的结构示意图;
图10是本发明电池电芯另一实施例的结构分解示意图;
图11是本发明电池电芯另一实施例的结构分解示意图;
图12是本发明电池电芯另一实施例的结构分解示意图;
图13是本发明电池电芯的制备方法一实施例的流程示意图;
图14是本发明电池电芯的制备方法一实施例的流程示意图;
图15是本发明电池电芯的制备方法另一实施例的流程示意图;
图16是本发明电池实施例的结构示意图;
图17是本发明电子设备实施例的结构示意图。
【具体实施方式】
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,均属于本发明保护的范围。
参见图1,本发明电池电芯一实施例中,电池电芯由正极片102、隔膜1022和负极片104叠加而成,其中,隔膜1022一体成形于正极片102和/或负极片104的至少一侧,用于隔离正极片102和负极片104。其中,隔膜的长度和/或宽度大于等于负极片104的长度和/或宽度。
参见图1至图4,在本实施例中,隔膜1022一体成形于正极片102上靠近负极片104的一侧,以隔离正极片102和负极片104。负极片104的长度和宽度分别大于正极片102的长度d1和宽度d2,隔膜1022的长度d3和宽度d4分别大于负极片104的长度和宽度,以避免正极片102与负极片104直接接触造成短路。电池装配时,负极片104与正极片102对齐设置,不需要再对齐隔膜1022,在一装配实施例中,隔膜是半透明的,可以通过光线的照射显示出正极片的轮廓阴影,便于负极片104与正极片102对齐。在本实施例中,可以通过在隔膜1022一体成形于正极片102上时即将隔膜1022与正极片102对齐,以使得负极片104与正极片102对齐时,即与隔膜1022对齐。或者,负极片104与一体成形于正极片102上的隔膜1022对齐设置,不需要再对齐正极片102。
在其他实施例中,隔膜还可以一体成形于负极片104靠近正极片102的一侧,以隔绝正极片102和负极片104。正极片102与负极片104对齐设置,或正极片102与一体成形于负极片104上的隔膜1022对齐设置。
参见图3,在本实施例中,隔膜1022包括依次层叠设置的第一连接层1022a、绝缘层1022b和第二连接层1022c,其中,第一连接层1022a和第二连接层1022c都可以为PVDF(Polyvinylidene Fluoride,聚偏氟乙烯)、PMMA (Polymethyl Methacrylate,聚甲基丙烯酸甲酯)等材料制成,与正极片102和负极片104的结合性良好;绝缘层1022b可以为氧化物颗粒直径小于50nm的氧化物陶瓷材料制成,例如氧化镁、氧化锆、氧化铝、勃姆石、氧化钙等,氧化物陶瓷材料的耐热性良好,不易因正负极片发热而改变其物理、化学特性。
在其他实施例中,隔膜1022还可以为单层绝缘层,例如氧化镁、氧化锆、氧化铝、勃姆石、氧化钙等。
本发明实施例通过将隔膜一体成形于正极片或负极片的一侧,能够减少正极片、隔膜和负极片的对齐次数,简化电池的制备过程。
参见图5,本发明电池电芯另一实施例包括正极片102、负极片104和隔膜,其中,负极片104设置于正极片102上;隔膜分别一体成形于正极片102上靠近负极片104的一侧,和负极片104上靠近正极片102的一侧,用于隔离正极片102和负极片104。其中,负极片104的长度和宽度分别大于正极片102的长度和宽度,正极片102上的隔膜1022的长度和宽度分别大于正极片102的长度和宽度,负极片104上的隔膜1042的长度和宽度分别大于负极片104的长度和宽度。电池装配时,负极片104与正极片102对齐设置,不需要再对齐隔膜1022;或负极片104与一体成形于正极片102上的隔膜1022对齐设置,不需要再对齐正极片102;或负极片104上的隔膜1042与正极片102上的隔膜1022对齐设置。
参见图3,在本实施例中,正极片102上的隔膜1022包括依次层叠设置的第一连接层1022a、绝缘层1022b和第二连接层1022c,负极片104上的隔膜1042与正极片102上的隔膜1022结构相同,其中,正极片102上的隔膜1022的第二连接层1022c与负极片104上的隔膜1042的第二连接层(图中未示出)的结合性良好,使得正极片102与负极片104结合紧密。
本发明实施例通过将隔膜分别一体成形于正极片和负极片相对的一侧,不仅能够减少正极片、隔膜和负极片的对齐次数,简化电池的制备过程。
参见图6和图7,本发明电池电芯另一实施例包括正极片202、负极片204和隔膜2022,其中,负极片204设置于正极片202上;隔膜2022一体成形于正极片上202靠近负极片204的一侧,用于隔离正极片202和负极片204。其中,隔膜2022的长度和宽度、正极片202的长度和宽度分别与的负极片204的长度和宽度都相等。电池装配时,负极片204与一体成形于正极片202上的隔膜2022对齐设置,不需要再对齐正极片202,并且由于隔膜2022的长度和宽度与负极片204的长度和宽度都相等,使得隔膜2022与负极片204的对齐装配更简单。
在本实施例中,隔膜2022可以为单层绝缘层,也可以包括依次层叠设置的第一连接层、绝缘层和第二连接层,以使得隔膜2022在隔离正极片202和负极片204的同时,与正极片202和负极片204的结合紧密。
参见图8,本发明电池电芯另一实施例包括正极片202、负极片204和隔膜,其中,负极片204设置于正极片202上;隔膜分别一体成形于正极片202上靠近负极片204的一侧,和负极板204上靠近正极片202的一侧,用于隔离正极片202和负极片204。其中,正极片202上的隔膜2022的长度和宽度分别与正极片202的长度和宽度相等,负极片204上的隔膜2042的长度和宽度分别与的负极片204的长度和宽度都相等,隔膜2022和隔膜2042的长度和宽度分别相等。电池装配时,负极片204上的隔膜2042与正极片202上的隔膜2022对齐设置,并且由于正极片202上的隔膜2022的长度和宽度与负极片204上的隔膜2042的长度和宽度都相等,使得对齐装配更简单。
本发明实施例通过将隔膜一体成形于正极片和/或负极片的一侧,能够减少正极片、隔膜和负极片的对齐次数,简化电池的制备过程。
本发明电池电芯另一实施例包括多片正极片、多片负极片和多片隔膜,电池电芯表面部分的正极片靠近负极片的一侧一体成形有隔膜,电池电芯中间部分包括两侧一体成形有隔膜的正极片。
参见图9和图10,电池电芯包括依次层叠设置的第一正极片302、第一负极片3042、第二正极片306、第二负极片3044、隔膜;其中,电池电芯表面部分的第一正极片302靠近第一负极片3042的一侧一体成形有隔膜3022,电池电芯中间部分的正极片,即第二正极片306的两侧一体成形有隔膜3062、3064,用于分别隔离正极片和负极片,在本实施例中,电池电芯中间部分的正极片只有一片,在其他实施例中,中间部分的正极片的数量可以为两片以上,当中间部分的正极片数量为两片以上时,中间部分的正极片可以有部分只在正极片的其中一侧一体成形有隔膜,另一侧的隔膜则一体成形于负极片上。其中,第一正极片302的隔膜3022,第二正极片306的隔膜3062、3064的长度和宽度大于第一负极片3042、第二负极片3044的长度和宽度,以避免正极片与负极片直接接触造成短路。电池装配时,负极片与正极片对齐设置,在一装配实施例中,隔膜是半透明的,可以通过光线的照射显示出正极片的轮廓阴影,便于负极片304与正极片302对齐;或负极片与一体成形于正极片上的隔膜对齐设置。
本发明电池电芯另一实施例包括多片正极片、多片负极片和多片隔膜,电池电芯表面部分的负极片靠近正极片的一侧一体成形有隔膜,电池电芯中间部分包括两侧一体成形有隔膜的负极片。
参见图11,电池电芯包括依次层叠设置的第一负极片402、第一正极片4042、第二负极片406、第二正极片4044、隔膜;其中,电池电芯表面部分的第一负极片402靠近第一正极片4042的一侧一体成形有隔膜4022,电池电芯中间部分的负极片,即第二负极片406的两侧一体成形有隔膜4062、4064,用于分别隔离正极片和负极片,在本实施例中,电池电芯中间部分的负极片只有一片,在其他实施例中,中间部分的负极片的数量可以为两片以上,当中间部分的负极片数量为两片以上时,中间部分的负极片可以有部分只在负极片的其中一侧一体成形有隔膜,另一侧的隔膜则一体成形于正极片上。电池装配时,正极片与负极片对齐设置,在一装配实施例中,隔膜是半透明的,可以通过光线的照射显示出负极片的轮廓阴影,便于负极片与正极片对齐;或正极片与一体成形于负极片上的隔膜对齐设置。
参见图12,电池电芯包括依次层叠设置的第一正极片502、第一负极片504、第二正极片506、第二负极片508、隔膜;其中,第一负极片504、第二正极片506和第二负极片508靠近第一正极片502的一侧一体成形有隔膜5042、5062和5082,用于与下侧的极片隔离,电池电芯表面部分的第一正极片502不设隔膜。电池装配时,正极片、负极片分别对齐设置,在一装配实施例中,隔膜是半透明的,可以通过光线的照射显示出正极片的轮廓阴影,便于负极片与正极片对齐或通过光线的照射显示出负极片的轮廓阴影,便于正极片与负极片对齐;或正/负极片与一体成形于负/正极片上的隔膜对齐设置。
在其他实施例中,还可以为正极片、隔膜与负极片的长度和宽度分别都相等。由于正极片、隔膜与负极片的长度和宽度都相等,使得正极片、负极片的对齐装配更简单。
本发明实施例通过将隔膜一体成形于正极片和/或负极片的至少一侧,能够减少正极片、隔膜和负极片的对齐次数,简化电池的制备过程。
参见图1、图3、图13和图14,本发明电池电芯的制备方法一实施例包括:
S801、提供正极片102、负极片104和隔膜1022,其中隔膜一体成形于正极片102和/或负极片104的至少一侧,用于隔离正极片102和负极片104;
S802、将正极片102、隔膜1022和负极片104层叠形成电池电芯,其中正极片102和/或负极片104的至少一侧的隔膜对应设置于正极片102与负极片104之间。
在提供正极片102、负极片104和隔膜1022之前,还包括:在正极片102和/或负极片104的至少一侧一体化制备隔膜。
在本实施例中,在正极片102和/或负极片104的至少一侧一体化制备隔膜1022具体包括:
S8011、提供第一连接层1022a、绝缘层1022b和第二连接层1022c;
S8012、将第一连接层1022a、绝缘层1022b和第二连接层1022c依次层叠复合,制成隔膜1022;
在本实施例中,第一连接层1022a、绝缘层1022b和第二连接层1022c可以直接复合,或通过工业胶水等进行复合。
S8013、将隔膜1022复合至正极片102和/或负极片104的至少一侧。
在本实施例中,第一连接层1022a和第二连接层1022c都可以为PVDF、PMMA等材料制成,与正极片102和负极片104的结合性良好,第一连接层1022a、第二连接层1022c可以分别与正极片102、负极片104复合。绝缘层1022b可以为氧化物颗粒直径小于50nm的氧化物陶瓷材料制成,例如氧化镁、氧化锆、氧化铝、勃姆石、氧化钙等,氧化物陶瓷材料的耐热性良好,不易因正负极片发热而改变其物理、化学特性。
在本实施例中,隔膜1022一体成形于正极片102的至少一侧,将正极片102、隔膜1022和负极片104层叠形成电池电芯的过程中,负极片104可以直接复合至隔膜1022的第二连接层1022c。负极片104与第二连接层1022c复合时,负极片104与正极片102对齐,将正极片102、隔膜1022和负极片104层叠形成电池电芯,例如将负极片104的中心与正极片102的中心(即第二连接层1022c的中心)对齐,无需再与隔膜1022进行对齐;或将负极片104与一体成形于正极片102上的隔膜对齐,将正极片102、隔膜1022和负极片104层叠形成电池电芯,例如将负极片104的中心与隔膜1022的中心对齐,无需再与正极片102对齐,即可以完成电池的堆叠。
在其他实施例中,隔膜一体成形于负极片的至少一侧,将正极片、隔膜和负极片层叠形成电池电芯的过程中,正极片102与负极片104对齐,或正极片与一体成形于正极片102上的隔膜对齐,将正极片102、隔膜1022和负极片104层叠形成电池电芯。
在其他实施例中,隔膜一体成形于正极片和负极片的至少一侧,将正极片、隔膜和负极片层叠形成电池电芯的过程中,负极片上的隔膜和正极片上的隔膜对齐,将正极片、隔膜和负极片层叠形成电池电芯。
在其他实施例中,隔膜1022还可以为单层绝缘层,例如氧化镁、氧化锆、氧化铝、勃姆石、氧化钙等。
在本实施例中,负极片104的宽度大于正极片102的宽度。
在其他实施例中,负极片104的长度和宽度都可以等于正极片102的长度和宽度,以使得正极片102和负极片104在堆叠过程中可以使用同一种夹具,并且易于对齐,使得电池装配过程很简单。
参见图1、图3和图15,本发明电池电芯的制备方法另一实施例包括:
S901、提供正极片102、负极片104和隔膜1022,其中隔膜一体成形于正极片102和/或负极片104的至少一侧,用于隔离正极片102和负极片104;
S902、将正极片102、隔膜1022和负极片104层叠形成电池电芯。
在提供正极片102、负极片104和隔膜1022之前,还包括:在正极片102和/或负极片104的至少一侧一体化制备隔膜。
具体的,包括:S900、在正极片102和/或负极片104的至少一侧依次涂布第一连接层1022a、绝缘层1022b和第二连接层1022c,以形成隔膜;
在本实施例中,可以在正极片102上涂布1μm(微米)的PVDF作为第一连接层1022a,在第一连接层1022a上涂布1μm的氧化镁作为绝缘层1022b,在绝缘层1022b上涂布1μm的PVDF作为第二连接层。
在其他实施例中,第一连接层1022a、绝缘层1022b和第二连接层1022c的厚度还可以为0.8μm、1.2μm或1.5μm等。第一连接层1022a和第二连接层1022c还可以为PMMA,绝缘层1022b还可以为氧化锆、氧化铝、勃姆石、氧化钙等。
本发明实施例通过将隔膜一体成形于正极片和/或负极片的至少一侧,能够减少正极片、隔膜和负极片的对齐次数,简化电池的制备过程。
参见图16,本发明电池200实施例包括电池电芯2002,具体的,电芯的结构参见上述电池电芯实施例,在此不再赘述。
本发明实施例通过将隔膜一体成形于正极片和/或负极片的至少一侧,能够减少正极片、隔膜和负极片的对齐次数,简化电池的制备过程。
参见图17,本发明电子设备300一实施例包括电池3002,具体的,电池2002的结构参见上述电池实施例,在此不再赘述。
本发明实施例通过将隔膜一体成形于正极片和/或负极片的至少一侧,能够减少正极片、隔膜和负极片的对齐次数,简化电池的制备过程。
以上所述仅为本发明的实施方式,并非因此限制本发明的专利范围,凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换,或直接或间接运用在其他相关的技术领域,均同理包括在本发明的专利保护范围内。

Claims (20)

  1. 一种电池电芯,所述电池芯片由正极片、隔膜和负极片叠加而成,其特征在于,所述隔膜一体成形于所述正极片和/或所述负极片的至少一侧,用于隔离所述正极片和所述负极片。
  2. 根据权利要求1所述的电池电芯,其特征在于,包括多片正极片、多片负极片和多片隔膜,所述电池电芯表面部分的正极片靠近负极片的一侧一体成形有隔膜,所述电池电芯中间部分包括两侧一体成形有隔膜的正极片。
  3. 根据权利要求1所述的电池电芯,其特征在于,包括多片正极片、多片负极片和多片隔膜,所述电池电芯的表面部分的负极片靠近正极片的一侧一体成形有隔膜,所述电池电芯中间部分包括两侧一体成形有隔膜的负极片。
  4. 根据权利要求1-3任一所述的电池电芯,其特征在于,
    所述隔膜一体成形于所述正极片的至少一侧,所述负极片与所述正极片对齐设置或所述负极片与一体成形于所述正极片上的所述隔膜对齐设置。
  5. 根据权利要求1-3任一所述的电池电芯,其特征在于,
    所述隔膜一体成形于所述负极片的至少一侧,所述正极片与所述负极片对齐设置或所述正极片与一体成形于所述负极片上的所述隔膜对齐设置。
  6. 根据权利要求1-3任一所述的电池电芯,其特征在于,
    所述隔膜一体成形于所述正极片和所述负极片的至少一侧,所述负极片上的隔膜和所述正极片上的隔膜对齐设置。
  7. 根据权利要求1所述的电池电芯,其特征在于,
    所述隔膜为单层绝缘层。
  8. 根据权利要求1所述的电池电芯,其特征在于,所述隔膜包括:
    第一连接层;
    绝缘层,设置于所述第一连接层上;
    第二连接层,设置于所述绝缘层上。
  9. 根据权利要求7或8所述的电池电芯,其特征在于,
    所述绝缘层为氧化物陶瓷。
  10. 根据权利要求9所述的电池电芯,其特征在于,
    所述氧化物陶瓷的氧化物颗粒直径小于50nm。
  11. 根据权利要求8所述的电池电芯,其特征在于,
    所述第一连接层和所述第二连接层为PVDF或PMMA。
  12. 一种电池,其特征在于,所述电池包括权利要求1-11任一所述电池电芯。
  13. 一种电子设备,其特征在于,所述电子设备包括权利要求12所述的电池。
  14. 一种电池电芯的制备方法,其特征在于,包括:
    提供正极片、负极片和隔膜,其中所述隔膜一体成形于所述正极片和/或所述负极片的至少一侧,用于隔离所述正极片和所述负极片;
    将所述正极片、所述隔膜和所述负极片层叠形成所述电池电芯,其中所述正极片和/或所述负极片的至少一侧的隔膜对应设置于所述正极片与所述负极片之间。
  15. 根据权利要求14所述的方法,其特征在于,在所述提供正极片、负极片和隔膜之前,所述方法包括:
    在所述正极片和/或所述负极片的至少一侧一体化制备隔膜;
  16. 根据权利要求15所述的方法,其特征在于,所述在所述正极片和/或所述负极片的至少一侧一体化制备隔膜具体包括:
    提供第一连接层、绝缘层和第二连接层;
    将所述第一连接层、绝缘层和第二连接层依次层叠复合,制成隔膜;
    将所述隔膜复合至正极片和/或负极片的至少一侧。
  17. 根据权利要求15所述的方法,其特征在于,所述在所述正极片和/或所述负极片的至少一侧一体化制备隔膜的方法具体包括:
    在所述正极片和/或负极片的至少一侧依次涂布第一连接层、绝缘层和第二连接层,以形成隔膜。
  18. 根据权利要求14所述的方法,其特征在于,所述隔膜一体成形于所述正极片的至少一侧,所述将所述正极片、所述隔膜和所述负极片层叠形成所述电池电芯包括:
    将所述负极片与所述正极片对齐或将述负极片与一体成形于所述正极片上的所述隔膜对齐;
    将所述正极片、所述隔膜和所述负极片层叠形成所述电池电芯。
  19. 根据权利要求14所述的方法,其特征在于,所述隔膜一体成形于所述负极片的至少一侧,所述将所述正极片、所述隔膜和所述负极片层叠形成所述电池电芯包括:
    将所述正极片与所述负极片对齐或将所述正极片与一体成形于所述正极片上的所述隔膜对齐;
    将所述正极片、所述隔膜和所述负极片层叠形成所述电池电芯。
  20. 根据权利要求14所述的方法,其特征在于,所述隔膜一体成形于所述正极片和所述负极片的至少一侧,所述将所述正极片、所述隔膜和所述负极片层叠形成所述电芯包括:
    将所述负极片上的隔膜和所述正极片上的隔膜对齐;
    将所述正极片、所述隔膜和所述负极片层叠形成所述电池电芯。
PCT/CN2018/080988 2018-03-29 2018-03-29 一种电池电芯及其制备方法、电池、电子设备 WO2019183865A1 (zh)

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