WO2019083254A1 - Procédé de fabrication de boîtier de batterie cylindrique ayant une rugosité de surface améliorée - Google Patents

Procédé de fabrication de boîtier de batterie cylindrique ayant une rugosité de surface améliorée

Info

Publication number
WO2019083254A1
WO2019083254A1 PCT/KR2018/012565 KR2018012565W WO2019083254A1 WO 2019083254 A1 WO2019083254 A1 WO 2019083254A1 KR 2018012565 W KR2018012565 W KR 2018012565W WO 2019083254 A1 WO2019083254 A1 WO 2019083254A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery case
surface roughness
ironing
forming
cylindrical
Prior art date
Application number
PCT/KR2018/012565
Other languages
English (en)
Korean (ko)
Inventor
황보광수
이제준
정상석
김준탁
이길영
구성모
Original Assignee
주식회사 엘지화학
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 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to CN201880024824.9A priority Critical patent/CN110506344B/zh
Priority to US16/606,613 priority patent/US20200335736A1/en
Priority to JP2019556978A priority patent/JP7444357B2/ja
Priority to EP18870614.7A priority patent/EP3648192A4/fr
Priority to CN202310732830.2A priority patent/CN116742102A/zh
Priority claimed from KR1020180126665A external-priority patent/KR102252386B1/ko
Publication of WO2019083254A1 publication Critical patent/WO2019083254A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
    • H01M50/145—Primary casings; Jackets or wrappings for protecting against damage caused by external factors for protecting against corrosion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/30—Deep-drawing to finish articles formed by deep-drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • 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
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a method of manufacturing a cylindrical battery case, and more particularly, to a method of manufacturing a cylindrical battery case by improving the surface roughness of a battery case by performing a plurality of ironing processes during a manufacturing process To a method of manufacturing a cylindrical battery case.
  • the secondary battery includes a nickel cadmium battery, a nickel metal hydride battery, a lithium ion battery, and a lithium ion polymer battery.
  • a secondary battery is not only a compact product such as a digital camera, a P-DVD, an MP3P, a mobile phone, a PDA, a portable game device, a power tool and an e-bike, but also a large product requiring high output such as an electric car or a hybrid car, Power storage devices for storing power generation and renewable energy, and backup power storage devices.
  • the lithium secondary battery generally comprises a cathode, a separator, and an anode. These materials are selected in consideration of battery life, charge / discharge capacity, temperature characteristics, stability, and the like.
  • the secondary battery is classified into a cylindrical battery in which the case is cylindrical, a prismatic battery in which the case is square, and a pouch-type battery in which the case is thin laminate sheet, depending on the shape of the battery case.
  • an electrode assembly is embedded in a battery case as a power generating device capable of charging and discharging, which has a stacked structure of a positive electrode / separator / negative electrode.
  • the electrode assembly includes a jelly- Type structure in which a plurality of positive electrodes and negative electrodes of a predetermined size are sequentially stacked with a separator interposed therebetween.
  • the jelly-roll type electrode assembly has advantages such as easy manufacture and high energy density per weight, and jelly-roll type electrode assembly is easily manufactured especially in a cylindrical battery case.
  • the cylindrical battery case is generally formed by first punching a strip-shaped metal battery can made of a nickel-plated steel sheet to form a disk-shaped plate corresponding to a desired cylindrical battery case, and the plate is subjected to deep- It is molded into a middle cup sieve.
  • the intermediate cup body is formed into a second intermediate cup body near the cylindrical battery case by redrawing by a deep drawing process. Finally, the second intermediate cup body is DI (drawing and ironing) The case is molded.
  • the material of the existing cylindrical battery case is a steel sheet plated with Ni on low carbon steel, and the Ni layer serves as a protective layer for protecting the Fe layer.
  • the concept is shown in Fig.
  • the outer diameter preparation process of the cylindrical body is a drawing process, so that the surface of the battery case is provided with process results with a surface roughness higher than a specific level by drawing tension, and the surface gloss of such a cylindrical battery case is not high.
  • a diaphragm process a diaphragm process after the ironing process.
  • Japanese Patent Laid-Open Publication No. 2003-263974 discloses a method of manufacturing a sheet metal punching process for punching a metal can made of a strip-shaped metal plate to form a regular-sized plate material, a step of forming the plate material to form a first half cup shape having a cross-
  • There is a difference because it is not a technique that specifies corrosion resistance enhancement through reduction of illumination.
  • Japanese Patent No. 4,119,612 discloses a rectangular rectangular battery can having a transversely sectioned shape in which a power generating element is housed and constitutes a prismatic battery, characterized in that the substantially rectangular short side plate portion has a thickness larger than the thickness of the long side plate portion
  • Japanese Patent No. 4,119,612 discloses a rectangular rectangular battery can having a transversely sectioned shape in which a power generating element is housed and constitutes a prismatic battery, characterized in that the substantially rectangular short side plate portion has a thickness larger than the thickness of the long side plate portion
  • Japanese Laid-Open Patent Publication No. 2009-037980 discloses that the above-mentioned intermediate cup body is subjected to one-stage drawing processing and three-stage ironing processing by a drawing and ironing machine at a time in a continuous manner. However, There is a difference because it is not a technique that specifies strengthening configuration.
  • the inventors of the present application have conducted intensive research and various experiments. Therefore, it is a primary object of the present invention to solve the above-mentioned problems of the prior art, and it is an object of the present invention to solve an environment susceptible to relatively high corrosion of an electric vehicle battery, And an improved method of manufacturing a cylindrical battery case.
  • an object of the present invention is to provide a battery case in which deep drawing is performed for forming an outer diameter of the battery case, Is performed a plurality of times.
  • primary ironing may be performed during deep drawing to form the body of the battery case
  • secondary ironing may be performed during deep drawing to form the stepped portion of the battery case.
  • the surface roughness (Ra) of the battery case after the ironing process may be 0.1 m or less.
  • the thickness reduction of the battery case after the ironing process performed in a plurality of times may be constant.
  • a method of manufacturing a steel plate comprising: forming a nickel plating layer on at least one surface of a steel sheet; A second step of subjecting the steel sheet of the first step to a heat treatment in a reducing atmosphere; A third step of blanking and drawing the steel sheet of the second step; A fourth step of performing first deep drawing and first ironing for forming the steel sheet in the third step for forming the battery case body; A fifth step of performing second deep-drawing processing for forming the body in the fourth step; A sixth step of performing a third deep drawing and a second ironing for forming a step on the body in the fifth step; And a seventh step of forming a taper and a flange on the body of the sixth step.
  • the surface roughness (Ra) of the battery case after the primary ironing process may be 0.2 ⁇ or less.
  • the surface roughness (Ra) of the battery case after the secondary ironing process may be 0.1 ⁇ or less.
  • the battery case may be a secondary battery including a battery case manufactured by the cylindrical battery case manufacturing method.
  • it may be a device including the secondary battery.
  • the device may be a device selected from the group consisting of an electronic device, an electric vehicle, a hybrid vehicle, and a power storage device.
  • FIG. 1 is a conceptual view of a nickel plating layer of a conventional cylindrical secondary battery.
  • FIG. 2 is a graph showing corrosion resistance test results of a conventional cylindrical secondary battery.
  • Example 3 is a photograph of the appearance of the cylindrical battery case of Example 1 and Comparative Example 1
  • FIG. 1 is a conceptual view of a nickel plating layer of a conventional cylindrical secondary battery.
  • a nickel-plated steel sheet formed by forming a nickel plating layer on the surface of a steel sheet is used as a material for a cylindrical secondary battery case.
  • the nickel-plated steel sheet is mainly applied to a battery case in which strong alkaline potassium hydroxide such as an alkaline dry battery or a nickel-cadmium storage battery is used as an electrolytic solution.
  • the nickel plated layer is resistant to corrosion against an alkaline substance, has a stable contact resistance when the battery is connected to an external terminal, and has an advantage of excellent spot weldability when assembling a battery.
  • FIG. 2 is a graph showing corrosion resistance test results of a conventional cylindrical secondary battery.
  • the corrosion resistance test of the cylindrical rechargeable battery cell case was carried out at 60 ° C and 95% RH for 7 days as a storage test under high temperature and high humidity conditions, and spot corrosion of the surface was confirmed.
  • Spot corrosion was confirmed on the surface of the test result, and at least one spot corrosion was confirmed at a sample number of 50 to 100% based on the total sample quantity.
  • the battery case manufacturing process of the conventional cylindrical secondary battery may have a step (# 1) of bricking and drawing nickel-plated base metal, and idling the base metal.
  • the No Tubing model of the EV secondary battery can be exposed to a relatively corrosive environment.
  • a secondary battery such as Tesla
  • only a secondary battery satisfying corrosion conditions within a limit of 60 ° C (95% RH) and 7days after high temperature and high humidity storage is allowed. Therefore, the ironing process, which is a method of realizing a high-gloss surface of the battery case for improving the corrosion resistance, was reflected.
  • the surface roughness of the cylindrical secondary battery cell case generates a potential difference inside the metal, thereby creating an environment in which local corrosion is liable to occur. Therefore, by reducing the surface roughness (Ra) value, the surface area can be reduced to improve the corrosion resistance.
  • the ironing process is divided into two processes, and the final ironing process is changed to the process after drawing to improve the gloss.
  • Drawing process has roughness and luster disappearing due to tensile force of side part, and ironing process can push down material and maintain thickness reduction and uniformity, which can reduce the roughness and gloss by compression friction of die. That is, the larger the ironing amount, the lower the surface roughness.
  • primary ironing may be performed during deep drawing to form the body of the battery case
  • secondary ironing may be performed during deep drawing to form the stepped portion of the battery case.
  • the surface roughness (Ra) of the battery case after the ironing process may be 0.1 m or less.
  • the thickness reduction of the battery case after the ironing process performed in a plurality of times may be constant.
  • the ironing process proceeds 0.04 mm at a time in the case of two times of progressing, .
  • the thickness reduction value of the battery case can be kept the same.
  • a method of manufacturing a steel plate comprising: forming a nickel plating layer on at least one surface of a steel sheet; A second step of heat treating the steel sheet in the first step in a reducing atmosphere; A third step of blanking and drawing the steel sheet of the second step; A fourth step of performing first deep drawing and first ironing for forming the steel sheet in the third step for forming the battery case body; A fifth step of subjecting the steel sheet of the fourth step to a second deep-drawing process for forming a battery case body; A sixth step of performing a third deep drawing and a second ironing for forming a step on the body in the fifth step; And a seventh step of forming a taper and a flange on the body of the sixth step.
  • the surface roughness (Ra) of the battery case after the primary ironing process may be 0.2 ⁇ or less.
  • the surface roughness (Ra) of the battery case after the secondary ironing process may be 0.1 ⁇ or less.
  • the battery case may be a secondary battery including a battery case manufactured by the cylindrical battery case manufacturing method.
  • it may be a device including the secondary battery.
  • the device may be a device selected from the group consisting of an electronic device, an electric vehicle, a hybrid vehicle, and a power storage device.
  • step (# 1) of bricking and drawing the nickel-plated base metal and idling the base metal may be performed.
  • the cylindrical battery case was manufactured through trimming (# 13).
  • the ironing process is a process of reducing the thickness of the base material by 0.04 mm.
  • the ironing process is performed to reduce the base material thickness by 0.04 mm.
  • the ironing process of the step (# 8) is performed by reducing the thickness of the base material by 0.08 mm, and in the step # 10, the body ironing step is omitted.
  • a cylindrical battery case was manufactured by the same procedure.
  • the cylindrical battery case of Example 1 has a significantly increased surface gloss compared to the cylindrical battery case of Comparative Example 1, .
  • the corrosion resistance test was carried out using the cylindrical battery case manufactured in Example 1 and Comparative Example 2.
  • the corrosion resistance test was carried out at 60 ° C and 95% RH for 7 days after storage under high temperature and high humidity conditions. Then, to check whether corrosion occurred on the surface of the cylindrical secondary battery cell case, . The results of the corrosion resistance test are shown in the photograph of FIG.
  • the cylindrical battery case was manufactured by the same process as in step 1 except that the ironing process of step (# 8) was performed by reducing the thickness of the base material by 0.15 mm.
  • the cylindrical battery case was fabricated by the same process as in step 1 except that the ironing process of step (# 8) was performed by reducing the thickness of the base material by 0.05 mm.
  • the surface roughness (R a ) value ranged from a minimum of 0.022 to a maximum of 0.040, and an average value thereof was 0.03.
  • the surface roughness (R a ) value ranged from 0.099 to 0.142 at the minimum, and the average value was 0.115.
  • the surface roughness (R a ) value of the cylindrical battery case of Comparative Example 3 showed a minimum value of 0.179 to a maximum of 0.309, and an average value thereof was 0.236.
  • the surface roughness (R z ) value ranged from a minimum of 0.152 to a maximum of 0.427, an average value was 0.202, and a surface roughness (R z ) value of the cylindrical battery case of Comparative Example 2 was the minimum 0.542 to a maximum value of 0.944 and an average value of 0.713.
  • the surface roughness (R z ) value of the cylindrical battery case of Comparative Example 3 exhibited a minimum value of 0.924 to a maximum value of 2.436, and an average value thereof was 1.497.
  • the cylindrical battery case of Example 1 of the present invention can confirm the surface roughness improving effect, and the corrosion resistance due to the surface roughness improvement can be sufficiently expected.
  • the manufacturing process of the cylindrical battery case has the effect of lowering the surface roughness by changing the thickness reduction process have.
  • the present invention has the effect of improving the corrosion characteristics of the surface roughness.
  • the inner surface of the cylindrical battery case wall is formed on a suitable rough surface, the contact area between the electrode assembly and the inner surface of the side wall is increased, thereby significantly reducing the internal resistance of the battery.
  • the supporting property of the conductive material is improved, and the post-storage characteristics of the battery can be maintained high for a long period of time.
  • the thickness of the side wall is formed thinner than the thickness of the bottom wall by the ironing process, the amount of the positive electrode mixture or the amount of the active material can be increased, and battery performance such as charge and discharge characteristics can be improved.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'un boîtier de batterie cylindrique, dans lequel, afin d'améliorer les caractéristiques de corrosion du boîtier de batterie, le processus de repassage parmi les processus de fabrication est réalisé plusieurs fois, ce qui permet d'améliorer la rugosité de surface du boîtier de batterie. La présente invention est avantageuse en ce que, lorsqu'un boîtier de batterie cylindrique est fabriqué, un processus de complétion du diamètre externe du corps de la batterie cylindrique est changé en un processus de réduction d'épaisseur, ce qui permet de réduire la rugosité de surface, et les caractéristiques de corrosion spécifiques à la rugosité de surface sont améliorées.
PCT/KR2018/012565 2017-10-23 2018-10-23 Procédé de fabrication de boîtier de batterie cylindrique ayant une rugosité de surface améliorée WO2019083254A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN201880024824.9A CN110506344B (zh) 2017-10-23 2018-10-23 制造具有减小的表面粗糙度的圆柱形电池壳体的方法
US16/606,613 US20200335736A1 (en) 2017-10-23 2018-10-23 Method of Manufacturing Cylindrical Battery Case Having Reduced Surface Roughness
JP2019556978A JP7444357B2 (ja) 2017-10-23 2018-10-23 表面粗度が改善された円筒型電池ケースの製造方法
EP18870614.7A EP3648192A4 (fr) 2017-10-23 2018-10-23 Procédé de fabrication de boîtier de batterie cylindrique ayant une rugosité de surface améliorée
CN202310732830.2A CN116742102A (zh) 2017-10-23 2018-10-23 制造具有减小的表面粗糙度的圆柱形电池壳体的方法

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2017-0137092 2017-10-23
KR20170137092 2017-10-23
KR10-2018-0126665 2018-10-23
KR1020180126665A KR102252386B1 (ko) 2017-10-23 2018-10-23 표면조도를 개선한 원통형 전지케이스 제조방법

Publications (1)

Publication Number Publication Date
WO2019083254A1 true WO2019083254A1 (fr) 2019-05-02

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Country Status (1)

Country Link
WO (1) WO2019083254A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3105785B2 (ja) * 1996-05-20 2000-11-06 東洋鋼鈑株式会社 側壁薄肉化金属缶
JP2002015712A (ja) 2000-04-28 2002-01-18 Matsushita Electric Ind Co Ltd 電池缶およびその製造方法
JP2003263974A (ja) 2002-03-08 2003-09-19 Matsushita Electric Ind Co Ltd 円筒形金属缶の製造方法
JP4119612B2 (ja) 1999-05-07 2008-07-16 松下電器産業株式会社 角形電池缶およびその製造方法
JP2008311198A (ja) * 2007-06-18 2008-12-25 Panasonic Corp 電池缶およびそれを備えた電池
JP2009037980A (ja) 2007-08-03 2009-02-19 Panasonic Corp 電池缶および金属缶用ブランクとこれを用いた電池缶および金属缶の製造方法
KR20100097262A (ko) * 2009-02-26 2010-09-03 이성영 바닥면을 갖는 케이스의 제조방법
KR101621253B1 (ko) * 2015-10-21 2016-05-16 공병인 2차 전지 케이스의 제조방법
KR101643091B1 (ko) * 2014-03-31 2016-07-26 가부시키가이샤 고베 세이코쇼 각형 전지 케이스의 성형 방법
KR20170137092A (ko) 2015-03-13 2017-12-12 노보루토 게엠베하 돌기를 구비하는 자극 장치

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3105785B2 (ja) * 1996-05-20 2000-11-06 東洋鋼鈑株式会社 側壁薄肉化金属缶
JP4119612B2 (ja) 1999-05-07 2008-07-16 松下電器産業株式会社 角形電池缶およびその製造方法
JP2002015712A (ja) 2000-04-28 2002-01-18 Matsushita Electric Ind Co Ltd 電池缶およびその製造方法
JP2003263974A (ja) 2002-03-08 2003-09-19 Matsushita Electric Ind Co Ltd 円筒形金属缶の製造方法
JP2008311198A (ja) * 2007-06-18 2008-12-25 Panasonic Corp 電池缶およびそれを備えた電池
JP2009037980A (ja) 2007-08-03 2009-02-19 Panasonic Corp 電池缶および金属缶用ブランクとこれを用いた電池缶および金属缶の製造方法
KR20100097262A (ko) * 2009-02-26 2010-09-03 이성영 바닥면을 갖는 케이스의 제조방법
KR101643091B1 (ko) * 2014-03-31 2016-07-26 가부시키가이샤 고베 세이코쇼 각형 전지 케이스의 성형 방법
KR20170137092A (ko) 2015-03-13 2017-12-12 노보루토 게엠베하 돌기를 구비하는 자극 장치
KR101621253B1 (ko) * 2015-10-21 2016-05-16 공병인 2차 전지 케이스의 제조방법

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