WO2019024873A1 - Batterie au lithium-ion à bloc souple et procédé de fabrication associé - Google Patents

Batterie au lithium-ion à bloc souple et procédé de fabrication associé Download PDF

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Publication number
WO2019024873A1
WO2019024873A1 PCT/CN2018/098068 CN2018098068W WO2019024873A1 WO 2019024873 A1 WO2019024873 A1 WO 2019024873A1 CN 2018098068 W CN2018098068 W CN 2018098068W WO 2019024873 A1 WO2019024873 A1 WO 2019024873A1
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WIPO (PCT)
Prior art keywords
cell
battery
electrode tab
lithium ion
negative electrode
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PCT/CN2018/098068
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English (en)
Chinese (zh)
Inventor
钟宽
陈宝荣
吉纯
曾庆苑
李影
Original Assignee
格力电器（武汉）有限公司
珠海格力电器股份有限公司
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Publication of WO2019024873A1 publication Critical patent/WO2019024873A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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 invention relates to the technical field of lithium ion battery production, in particular to a soft-pack lithium ion battery and a manufacturing method thereof.
  • the soft-packed lithium ion battery using the aluminum plastic film has the characteristics of simple structure, small volume, light weight, shape according to needs, high energy density, high safety, and the like. Its application range is more and more extensive, and the demand is also increasing.
  • the current large-capacity soft-package batteries generally adopt a laminated production method: that is, a die-cut positive and negative electrode sheets and a separator are laminated together, which is characterized in that the fabricated battery has small internal resistance and is suitable for large current discharge, but its disadvantages.
  • the process is complicated, the production cost is high, the lamination efficiency is low, and the performance consistency is poor, and it is difficult to ensure the flatness of the battery in the subsequent charging and discharging, thereby affecting the cycle life.
  • the present invention provides a soft-package lithium ion battery, so that the production cost of a large-capacity soft-pack lithium-ion battery can be reduced, and at the same time, the large-capacity soft-pack battery can have excellent flatness and an ideal cycle life.
  • the present invention also provides a method of manufacturing a soft-pack lithium ion battery.
  • the present invention provides a soft-packed lithium ion battery comprising a battery core assembly and a soft package outer casing, wherein the battery core assembly comprises a plurality of battery cells in parallel with each other, and the battery cells are wound.
  • the cell assembly has a thickness of more than 1 cm.
  • the thickness of any one of the above-mentioned battery cells is not more than 1 cm.
  • the tab of the above-mentioned battery cell is any one of a full-ear, a multi-pole or a monopole.
  • the battery cell has a rectangular shape, and the positive electrode tab and the negative electrode tab of the battery cell are symmetrically distributed on both sides in the longitudinal direction of the battery cell.
  • the cell unit has a rectangular shape, and the positive electrode tab and the negative electrode tab of the cell unit are located on one side of the cell unit.
  • the above-mentioned battery core assembly includes 2 to 7 battery cells in parallel with each other.
  • the method for manufacturing a soft-package lithium ion battery disclosed in the present invention comprises the steps of:
  • Step 1) stacking the positive electrode sheets, the separator and the negative electrode sheets, and winding them to form the above-mentioned battery cells;
  • Step 2) stacking at least two of the above-mentioned battery cells to form a whole in parallel, and then welding the positive electrode tabs in the positive electrode bonding zone of the whole body, and forming the above-mentioned battery core assembly after welding the negative electrode tabs in the negative electrode bonding zone, the above electricity
  • the thickness of the core assembly is greater than 1 cm;
  • Step 3 The above-mentioned battery core assembly is fabricated into a soft-packed lithium ion battery by subsequent processing.
  • the subsequent processing includes: punching, top side sealing, liquid injection, hot and cold pressing, chemical formation, jig baking, secondary encapsulation, and partial volume.
  • the cell body prepared in the above step 1) has a rectangular shape, and the cell unit has a thickness of 5 mm to 10 mm, a width of 5 cm to 15 cm, and a length of 10 cm to 25 cm.
  • the positive blanking area is the positive electrode tab welding area
  • the negative electrode blanking area is the negative electrode tab welding area
  • the above step 1) further includes the above-mentioned battery core In the width direction of the single body, both ends of the positive electrode tab welding region and the negative electrode tab welding region are cut, and the cutting amount is 0.5 cm - 1 cm.
  • the positive electrode tab and the negative electrode tab have a thickness of 0.1 mm to 0.5 mm and a width of 3 cm to 10 cm.
  • the cell monomer produced in the above step 1) in the longitudinal direction of the cell unit, both ends of the coating on the negative electrode tab are beyond the coating on the positive electrode tab. In the layer, both ends of the separator exceed the coating on the negative electrode tab.
  • the positive electrode tab and the negative electrode tab are ultrasonically welded.
  • the positive electrode tab is an aluminum metal piece
  • the negative electrode tab is one of a nickel metal piece, a nickel plated metal piece, or a copper-nickel alloy metal piece.
  • the battery core assembly of the soft-packed lithium ion battery disclosed in the present invention is formed by a plurality of battery cells connected in parallel with each other, and each of the battery cells is wound.
  • the cell monomers, that is, the cell cells are cores, and the cell assembly formed by these cell cells has a thickness greater than 1 cm.
  • the wound type cell unit Compared with the lamination type production method, the wound type cell unit has higher production efficiency and lower production cost, and the structure in which a plurality of cell units are stacked in parallel can avoid the roll on the one hand.
  • the problem of high internal resistance of the winding structure cell can solve the problem of poor flatness of the thick core structure in the later charging and discharging process; the total number of cells formed by the parallel connection of multiple cells
  • the thickness of the battery assembly is greater than 1 cm, which makes the battery assembly have a larger capacity. Therefore, the soft-packed lithium ion battery made of the battery cell has high production efficiency, low production cost, and high energy density.
  • the battery capacity is large, and it can also improve the battery's high current charge and discharge performance.
  • FIG. 1 is a schematic structural view of a positive electrode tab or a negative pole tab disclosed in an embodiment of the present invention
  • FIG. 2 is a schematic view showing a position where a winding core is wound with a positive electrode and a separator according to a first embodiment of the present invention
  • FIG. 3 is a schematic structural view of a single battery cell after winding in the first embodiment
  • FIG. 4 is a schematic structural view of the battery cell shown in FIG. 3 after cutting the tab welding area at the edge;
  • Figure 5 is a schematic diagram showing the parallel connection of three battery cells in the first embodiment
  • FIG. 6 is a schematic structural view of a battery assembly formed by connecting three battery cells in parallel in a first embodiment after welding a large pole;
  • FIG. 7 is a schematic structural view of the battery assembly of FIG. 6 after completion of secondary packaging
  • FIG. 8 is a schematic view showing a position where a winding core is wound with a positive electrode and a separator according to a second embodiment of the present invention
  • Figure 9 is a schematic view showing the structure of the battery assembly in the second embodiment after welding the large tab
  • FIG. 10 is a schematic structural view of the battery assembly of FIG. 9 after the secondary packaging is completed.
  • 1 is a coating
  • 2 is a blanking zone
  • 3 is a positive pole piece
  • 4 is a negative electrode piece
  • 5 is a separator
  • 6 is a positive electrode bonding zone
  • 7 is a negative electrode bonding zone
  • 8 is a positive electrode tab
  • 9 is a negative electrode Extremely ear.
  • One of the cores of the present invention is to provide a soft-package lithium ion battery, so as to be able to reduce the production cost of a large-capacity soft-pack lithium-ion battery, and at the same time enable a large-capacity soft-pack battery to have excellent flatness and an ideal cycle life.
  • Another core of the present invention is to provide a method of fabricating a soft-pack lithium ion battery.
  • the soft-packed lithium ion battery disclosed in the present invention comprises a battery core assembly and a soft package outer casing, wherein the battery core assembly is formed by a plurality of battery cells connected in parallel with each other, and two adjacent battery cells are stacked one upon another. And any one of the battery cells is a wound type battery cell produced by winding, and the battery cell can also be simply referred to as a core, and the electricity formed by the parallel connection of a plurality of battery cells The thickness of the core assembly is greater than 1 cm.
  • the wound type cell unit Compared with the lamination type production method, the wound type cell unit has higher production efficiency and lower production cost, and the structure in which a plurality of cell units are stacked in parallel can avoid the roll on the one hand.
  • the problem of high internal resistance of the winding structure cell can solve the problem of poor flatness of the thick core structure in the later charging and discharging process; the total number of cells formed by the parallel connection of multiple cells
  • the thickness of the battery assembly is greater than 1 cm, which makes the battery assembly have a larger capacity. Therefore, the soft-packed lithium ion battery made of the battery cell has high production efficiency, low production cost, and high energy density.
  • the battery capacity is large, and it can also improve the battery's high current charge and discharge performance.
  • the thickness of the battery core assembly is greater than 1 cm, the thickness of any one of the battery cells is not more than 1 cm, and the plurality of battery cells are superposed and connected in parallel.
  • the assembly method has a great advantage, which can effectively solve the problem of poor flatness which occurs in the later charging and discharging process of the present thick electric core.
  • the soft-packed lithium ion battery in the embodiment of the present invention does not limit the polar mode of the cell, and the tab may be any one of a single pole, a multi-pole or a full-ear. That is, the ear can be a monopole, a multi-pole or a full-ear.
  • the tab of the cell of the present embodiment preferably uses an all-pole. ear.
  • the winding of the battery cells is formed by relying on a specific winding needle, and the winding needle itself determines the width of the battery cells. Therefore, the same direction of the cell core and the winding direction is usually the case.
  • the lower side is the width side of the cell, and the side perpendicular to the cell winding direction is usually the length side of the cell.
  • the cell is generally rectangular, and the positive electrode tab 8 and the negative electrode tab 9 of the cell unit can be symmetrically distributed on both sides of the length direction of the cell, or can be the positive tab 8 and The negative electrode tabs 9 are all located on one side of the cell, as shown in Figures 6 and 9.
  • 2 to 7 cell units can be connected in parallel to form a cell assembly, and then subjected to subsequent punching, top side sealing, liquid injection, hot and cold pressing, formation,
  • a large-capacity soft-pack lithium-ion battery in which a plurality of battery cells are connected in parallel is formed by a process such as jig baking, secondary encapsulation, and volume division.
  • the invention also provides a method for manufacturing a soft-package lithium ion battery, which comprises the following steps:
  • the coating layer 1 of the sheet 4 exceeds both ends of the coating layer 1 of the positive electrode tab 3 in the longitudinal direction at both ends in the longitudinal direction of the cell, that is, the coating 1 of the negative electrode tab 4 needs to be covered.
  • the coating layer 1 of the positive electrode tab 3 is short-circuited in order to prevent the positive and negative electrodes from coming into contact with each other, and both ends of the separator 5 in the longitudinal direction of the battery cell exceed the two ends of the coating layer 1 of the negative electrode tab 4 in the longitudinal direction. .
  • the "cell core length direction" in the present embodiment specifically means a direction perpendicular to the battery winding direction.
  • the incoming materials of the positive electrode tab 3, the negative electrode tab 4, and the separator 5 are all elongated, and the winding direction is actually along the length direction of the positive electrode tab 3, the negative electrode tab 4, and the separator 5 of the incoming material.
  • the direction perpendicular to the winding direction is actually the width direction of the positive pole piece 3, the negative pole piece 4, and the separator 5, so those skilled in the art need to pay attention to the direction change in the description, and the winding is completed.
  • the length direction of the cell unit is actually the width direction of the positive electrode tab 3, the negative pole tab 4, and the separator 5;
  • Step 2 stacking the battery cells in at least two of the above steps and forming a whole in parallel, then soldering the positive electrode tabs in the positive electrode pad 6 of the whole, and forming the cell assembly after the negative electrode pads 7 are soldered to the negative electrode tabs.
  • the thickness of the battery assembly is greater than 1 cm to ensure the capacity of the battery assembly;
  • Step 3 The battery assembly is made into a soft-packed lithium ion battery through subsequent processing.
  • the so-called subsequent processing usually includes punching, top side sealing, liquid injection, hot and cold pressing, chemical formation, fixture baking, secondary packaging, and volume division.
  • subsequent processing since the above process is a mature process in the current production process of the soft-packed lithium ion battery, the above process will not be described again in this embodiment.
  • the battery core assembly is formed by a plurality of battery cells connected in parallel with each other, and the battery cell is produced by winding, and the thickness of the battery core assembly is greater than 1cm, the winding type battery cell has high production efficiency and low production cost, and the structure in which a plurality of battery cells are stacked in parallel can avoid the problem of high internal resistance of the wound structure cell on the one hand, and the other
  • the aspect can solve the problem that the thick core structure always has poor flatness in the later charging and discharging process; the thickness of the battery core formed by the parallel connection of the plurality of battery cells is greater than 1 cm, which makes the cell assembly larger.
  • the capacity of the soft-packed lithium ion battery produced by the method for manufacturing a soft-packed lithium ion battery disclosed in the above embodiments is not only high in production efficiency, low in production cost, but also high in energy density and large in battery capacity. Features, and can also improve battery high current charge and discharge performance.
  • the cell unit produced in the step 1) of the above embodiment has a thickness of usually 5 mm to 10 mm and a width of 5 cm to 15 cm (this value usually varies depending on the needle), and the length is 10 cm to 25 cm (this is The values vary depending on the width of the positive electrode tab, the negative pole tab, and the separator feed, and the above numerical intervals include the endpoint values.
  • the positive electrode tab 3 and the negative electrode tab 4 have a blanking area 2 in addition to the coating 1, and in the all-pole cell unit after the winding is completed, the positive electrode remains.
  • the white area is the positive electrode bonding zone 6, and the negative electrode blanking zone is the negative electrode bonding zone 7, and the step 1) further includes: in the width direction of the cell unit, both ends of the positive electrode bonding zone 6 and the negative electrode bonding zone 7 are Cut and cut to a size of 0.5cm-1cm.
  • the positive electrode tab 8 and the negative electrode tab 9 have a thickness of 0.1 mm to 0.5 mm and a width of 3 cm to 10 cm, and the width direction of the tab is identical to the width direction of the cell. That is, the thickness of the positive electrode tab 8 is between 0.1 mm and 0.5 mm, the width is between 3 cm and 10 cm, and the thickness of the negative electrode tab 9 is between 0.1 mm and 0.5 mm, and the width is between 3 cm and 10 cm.
  • the welding of the positive electrode tab 8 and the negative electrode tab 9 is preferably ultrasonic welding, the positive electrode tab 8 is an aluminum metal piece, and the negative electrode tab 9 is a nickel metal piece, a nickel plated metal piece or a copper-nickel alloy.
  • the negative electrode tab 9 is a nickel metal sheet, a nickel-plated copper metal sheet or a copper-nickel alloy metal sheet.
  • the manufacturing method of the above-mentioned soft-packed lithium ion battery will be further elaborated in a specific manufacturing embodiment.
  • the left-right direction in FIG. 2 is the width direction
  • the up-and-down direction is the length direction.
  • the body is wound in the length direction.
  • the first specific manufacturing example is a first specific manufacturing example:
  • a positive electrode piece having a coating width of 134 mm, a blanking area width of 12 mm, a negative electrode piece having a coating width of 140 mm, a blanking area width of 11 mm, and a diaphragm having a width of 144.5 mm were wound into a core, so that a was 2 mm, b is 4 mm, c is 3 mm and d is 1.5 mm, and the obtained cell unit has a width of 8 cm, a length of 16.1 cm, and a thickness of 8 mm.
  • the capacity of the prepared cell monomer was 16.2 Ah, and the three cell assemblies formed in parallel had a thickness of 27 mm, a capacity of 48.6 Ah, an internal resistance of 3.0 m ⁇ , and a discharge capacity of 1.5 C of 98% of 0.2C.
  • a is that the negative electrode coating layer exceeds the size of the positive electrode coating layer at one end
  • b is the size of the negative electrode coating layer beyond the positive electrode coating layer at the other end
  • c is the separator that exceeds the negative electrode coating layer at one end.
  • Size, d is the size of the separator at the other end beyond the negative electrode coating.
  • the left-right direction in FIG. 2 is the width direction
  • the up-and-down direction is the length direction
  • the cell unit is wound in the longitudinal direction.
  • a positive electrode piece having a coating width of 120 mm, a blanking area width of 14 mm, a negative electrode piece having a coating width of 126 mm, a blanking area width of 10 mm, and a diaphragm having a width of 132 mm were wound into a cell unit, so that a It is 2 mm, b is 4 mm, c is 3 mm, and d is 3 mm, and the obtained cell unit has a width of 8.2 cm, a length of 14.8 cm, and a thickness of 5.5 mm.
  • the capacity of the single cell formed by the fabrication was 10.1 Ah, and the thickness of the four cell assemblies formed in parallel was 26 mm, the capacity was 40.4 Ah, the internal resistance was 1.8 m ⁇ , and the 1.5 C discharge capacity was 98.5% of 0.2 C.
  • the up-and-down direction in FIG. 8 is the width direction
  • the left-right direction is the length direction
  • the cell unit is wound in the longitudinal direction.
  • the positive electrode sheet having a positive electrode coating width of 71 mm and a whitening width of 9 mm was die-cut, so that the width of the metal-welded portion of the blank area was 5 cm; and the negative electrode layer having a width of the negative electrode coating of 74 mm and a blank width of 7 mm was used. Die-cutting, the width of the metal weld zone of the white space is 5 cm, and then the separator of width 80 mm, the positive and negative pole pieces are wound, so that a is 2 mm, b is 1 mm, c is 4 mm, and d is 2 mm. A cell monomer having a width of 80 mm, a length of 140 mm, and a thickness of 5.5 mm was obtained.
  • the four battery cells are superimposed, and the positive and negative poles are welded by ultrasonic welding in the positive and negative electrode tabs.
  • the ear size is: thickness 0.2mm, width 4mm, the positive electrode ear is aluminum ear, and the negative electrode ear is nickel plated copper ear.
  • the positive electrode tab, the negative pole tab, and the diaphragm should be overlapped.
  • FIG. 2 and FIG. 8 only for the sake of clarity, the relationship between the three dimensions is shown, and the components are only staggered and intercepted.

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

Abstract

L'invention concerne une batterie au lithium-ion à bloc souple, comprenant un ensemble de cellules et une enveloppe formant bloc souple. L'ensemble de cellules comprend une pluralité de corps de cellules uniques qui sont connectés en parallèle. Chaque corps de cellule unique est un corps de cellule de type spiralé. L'épaisseur de l'ensemble de cellules est supérieure ou égale à 1 cm. Le corps de cellule de type spiralé est plus avantageux en terme de rendement de production et plus rentable en terme de coûts de production. La structure selon laquelle les corps de cellules uniques sont assemblés en parallèle permet d'éviter un problème de résistance interne élevée du corps de cellule de type spiralé. La structure résout également un problème de mauvaise planéité apparaissant fréquemment dans un processus de charge/décharge d'une structure de cellule spiralée épaisse sur une période ultérieure. L'épaisseur de l'ensemble de cellules est supérieure à 1 cm lorsque les corps de cellules uniques sont connectés en parallèle, de sorte que l'ensemble de cellules a une capacité supérieure. La batterie au lithium-ion à bloc souple a un haut rendement et de faibles coûts de production, a une densité d'énergie élevée et une grande capacité, et a une performance de charge/décharge de courant de forte intensité améliorée. L'invention concerne également un procédé de fabrication de la batterie au lithium-ion à bloc souple.
PCT/CN2018/098068 2017-08-01 2018-08-01 Batterie au lithium-ion à bloc souple et procédé de fabrication associé WO2019024873A1 (fr)

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CN201710647960.0 2017-08-01
CN201710647960.0A CN107293809A (zh) 2017-08-01 2017-08-01 一种软包锂离子电池及其制造方法

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CN113540652A (zh) * 2020-03-30 2021-10-22 北京小米移动软件有限公司 电池及终端设备
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CN110948111B (zh) * 2019-12-09 2022-02-15 多氟多新能源科技有限公司 一种软包锂离子电池的极耳复合焊接方法
CN111725552A (zh) * 2020-08-05 2020-09-29 广州鹏辉能源科技股份有限公司 纽扣电池及其制造方法
CN112349950A (zh) * 2020-11-30 2021-02-09 蜂巢能源科技有限公司 Hev软包电芯及电池包
CN112531295A (zh) * 2020-12-22 2021-03-19 厦门海辰新能源科技有限公司 一种锂离子电池结构及极耳电连接方法
CN113078407B (zh) * 2021-04-29 2023-12-26 武汉蔚能电池资产有限公司 小容量电芯双重并联的高容量电池模组及其回收利用方法
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