WO2012165767A2 - Batterie secondaire, et procédé de fabrication associé - Google Patents

Batterie secondaire, et procédé de fabrication associé Download PDF

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Publication number
WO2012165767A2
WO2012165767A2 PCT/KR2012/003485 KR2012003485W WO2012165767A2 WO 2012165767 A2 WO2012165767 A2 WO 2012165767A2 KR 2012003485 W KR2012003485 W KR 2012003485W WO 2012165767 A2 WO2012165767 A2 WO 2012165767A2
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WO
WIPO (PCT)
Prior art keywords
cap
bonding member
heating
secondary battery
molten
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2012/003485
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English (en)
Korean (ko)
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WO2012165767A3 (fr
Inventor
정영호
김영덕
홍지준
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Route JD Inc
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Route JD Inc
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Publication of WO2012165767A2 publication Critical patent/WO2012165767A2/fr
Publication of WO2012165767A3 publication Critical patent/WO2012165767A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B23K1/0016—Soldering of electronic components
    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • 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
    • H01M50/147—Lids or covers
    • H01M50/155—Lids or covers characterised by the material
    • H01M50/157—Inorganic material
    • H01M50/159—Metals
    • 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
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/191—Inorganic material
    • 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/198—Sealing members characterised by the material characterised by physical properties, e.g. adhesiveness or hardness
    • 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

Definitions

  • the present invention relates to a secondary battery and a method of manufacturing the same, and more particularly, to a secondary battery for joining a can and a cap by using a melt bonding member having a melting point lower than the melting point of the can and cap forming a case of the secondary battery. It relates to a manufacturing method.
  • batteries that can be repeatedly charged / discharged that is, secondary batteries are classified into nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, lithium secondary batteries, and the like.
  • lithium secondary batteries are generally used in consideration of their lifetime and capacity. It is becoming.
  • the lithium secondary battery is classified into a lithium metal battery using a liquid electrolyte, a lithium ion battery, and a lithium polymer battery using a polymer solid electrolyte according to the type of electrolyte.
  • Lithium polymer batteries are classified into fully solid lithium polymer batteries containing no organic electrolyte at all and lithium ion polymer batteries using a gel polymer electrolyte containing organic electrolyte according to the type of polymer solid electrolyte.
  • Lithium ion secondary batteries have improved energy density and repeated service life characteristics compared to conventional secondary battery products, and these advantages have steadily increased demand and usage range.
  • the lithium ion secondary battery maintains a more stable performance against the change and risk factors of the external environment due to the high energy density, and in the abnormal situation, the contents of the electrode leak out of the case (pack) to violate the safety. To prevent this from happening, it is necessary to introduce fundamental safety measures in the product design.
  • the existing metal exterior material is generally composed of a can (container) for accommodating the contents of the battery and a cap (cover) covering the material, and the material is iron, stainless steel, aluminum and other metals, or These alloys are used.
  • the metal sheath which is permanently bonded and / or sealed by welding, not only provides the reliability of long-term use of the battery, but also protects the contents of the battery from external environmental factors such as pressure and mechanical shock, temperature and humidity changes, and at the same time It effectively prevents harmful chemicals from leaking out.
  • the conventional sealing method of welding a can and a cap of a battery by a method such as welding by applying a metal exterior material has the following problems.
  • the present invention has been conceived to improve the problems of the prior art as described above, by bonding using a dissimilar metal melt at a temperature lower than the melting point of the base material (eg, freely selectable from around 140 ° C), It is possible to minimize the heat transferred to the inside, can be easily and quickly sealed without constraints of the shape of the bonding site, there is no deformation of the base material, control the bonding area by controlling the coating amount of dissimilar metal melt material of the battery Provided is a secondary battery having improved sealing structure of a metal packaging material and a method of manufacturing the same.
  • the vent mechanism can release the sealability of the cell at a specific temperature by selecting the material of the appropriate dissimilar metal melt.
  • a secondary battery integrated with a sealing and / or a joint of a battery and a method of manufacturing the same This object is focused on the ease of controlling the coating amount and the bonding area of the molten material, it is possible to implement a secondary battery having a vent integrated sealing design capable of pressure durability control.
  • a secondary battery according to the present invention for achieving the above object is a metallic can including an accommodating portion and an opening for accommodating the electrode assembly and the electrolyte; A metallic cap positioned in the opening of the can to seal the can; And a fusion bonding member having a melting point lower than a melting point of the can and the cap and joining the can and the cap in a state interposed between the can and the cap. The can and the cap can be joined in a molten state.
  • the fusion bonding member may be melted by any one of contact resistance, high frequency heating, laser, light beam, pulse heat, or hot-ram.
  • the laser uses a YAG laser and can be absorbed by the fusion bonding member, and the light beam can be obtained by using a xenon lamp or a halogen lamp with high brightness.
  • the secondary battery according to the present invention includes a metallic can including an accommodating part and an open part accommodating the electrode assembly and the electrolyte solution; A metallic cap positioned in the opening of the can to seal the can; And a fusion bonding member having a melting point lower than a melting point of the can and the cap and joining the can and the cap in a state interposed between the can and the cap. 10. May be melted at 120 ° C.
  • the fusion bonding member may include at least one of gallium (Ga), indium (In), cadmium (Cd), or bismuth (Bi).
  • the molten bonding member is melted by a reflow apparatus including a heating furnace and a conveyor transported in the heating furnace, wherein the molten bonding member is applied by the conveyor in a state where it is applied to the junction of the can and the cap. It can be fed into the furnace and melted.
  • the melt bonding member may be melted by hot air or infrared rays heating the inside of the heating furnace.
  • the melt bonding member may be melted when the temperature of the accommodating part surrounded by the can and the cap rises to release the sealed state of the can and the cap.
  • the present invention comprises the steps of providing a metallic can including a receiving portion and an opening that is accommodated together with the electrode assembly and the electrolyte; Providing a metallic cap positioned at the opening of the can to seal the can; Providing a fusion bonding member having a melting point lower than a melting point of the can and the cap and between a junction of the can and the cap; And heating and melting the melt bonding member, and bonding the can and the cap to each other, wherein the bonding of the can and the cap comprises locally heating the reflow bonding member or reflowing the cap.
  • a method for manufacturing a secondary battery wherein the melt bonding member is heated.
  • Local heating of the molten bonding member may be performed using any one of contact resistance, high frequency heating, laser, light beam, pulse heat, or hot-ram. Can be heated locally.
  • the laser uses a YAG laser absorbed by the fusion bonding member, and the light beam can be obtained by using a xenon lamp or a halogen lamp with high brightness.
  • the reflow method may be applied when the melt bonding member is melted at 10 ° C. to 120 ° C.
  • the fusion bonding member may include at least one of gallium (Ga), indium (In), cadmium (Cd), or bismuth (Bi).
  • the molten bonding member may be melted by convection hot air, infrared rays, or heat of condensation.
  • a cooling jig may be used to prevent heat generated by hot air, infrared rays, or condensation heat that melts the fusion bonding member from being transferred to the battery element accommodated in the accommodating part.
  • the secondary battery according to the present invention in the process of melting and attaching different kinds of metals or metal compounds having a melting temperature range of a predetermined range to a base material (stainless steel, aluminum, iron, etc.) to be joined when sealing a metal exterior material.
  • a base material stainless steel, aluminum, iron, etc.
  • the following effects are obtained.
  • the bonding is performed at a lower temperature than the welding method, which is commonly used in the related art, it is possible to prevent the risk of thermal damage to the base metal or the components of the battery.
  • a temperature-sensitive vent mechanism that is relatively precisely controlled in a specific temperature range may be integrally implemented at the junction.
  • the joint itself can also be utilized as a pressure-sensitive vent mechanism that is controlled in a specific pressure range.
  • the field to which the secondary battery of the present invention can be particularly effectively applied is a thin light area secondary battery product, which has the effect of supplementing and improving the weak points of the prior art.
  • the present invention uses a local heating method to heat the molten bonding member, it is possible to reduce the possibility of being affected by heat in the battery components.
  • the present invention can increase the productivity of the secondary battery, because the melt bonding member can be melted by a reflow method using a conveyor system in the case of using a melt bonding member having a low melting point, the melt bonding portion at a lower temperature Since the ash can be melted, the onset temperature of the vent function can be lowered, thereby further increasing the safety of the secondary battery.
  • FIG. 1 is an exploded perspective view schematically illustrating a configuration of a rechargeable battery according to an exemplary embodiment of the present invention.
  • FIG. 2 is a plan view schematically illustrating the cap of FIG. 1.
  • FIG. 2 is a plan view schematically illustrating the cap of FIG. 1.
  • FIG 3 is a view illustrating matters to be considered when selecting a temperature / pressure range of a melt bonding member according to preferred embodiments of the present invention.
  • FIG. 4 is a perspective view schematically showing an example of a melt bonding member 30 according to a preferred embodiment of the present invention.
  • 5 and 6 are diagrams schematically illustrating a process of sealing a secondary battery according to a preferred embodiment of the present invention.
  • FIG. 7 and 8 are cross-sectional views schematically illustrating secondary batteries according to another embodiment of the present invention.
  • FIG. 9 is a cross-sectional view illustrating a modification of the receiving groove formed on the surface of the can and the cap according to a preferred embodiment of the present invention.
  • FIG. 10 is a perspective view schematically illustrating a sealing assembly process of a rechargeable battery according to another exemplary embodiment of the present invention.
  • FIG. 11 is a perspective view schematically illustrating a bonding process of a secondary battery according to still another embodiment of the present invention.
  • FIG. 1 is an exploded perspective view schematically illustrating a configuration of a rechargeable battery according to an exemplary embodiment of the present invention.
  • the rechargeable battery 100 includes a metallic can 10, a metallic cap 20, and a fusion bonding member 30 interposed between the can 10 and the cap 20. .
  • the can 10 has an accommodating portion 12 for accommodating components of a battery including an electrode assembly 40 and an electrolyte (not shown), and has an open portion 14 open at one end thereof.
  • the can 10 may itself function as an electrode terminal.
  • the can 10 in this embodiment is shown as a tetrahedral shaped battery, it will be readily understood by those skilled in the art that the can 10 can be modified to any number of dimensions required by the industry, such as a cylindrical battery or any other type of battery.
  • the receiving portion 12 of the can 10 is schematically illustrated in a rectangular shape as a space for accommodating / receiving the electrode assembly 40 and the electrolyte solution, but the shape or shape of the electrode assembly 40 actually assembled. It may be changed in a corresponding form.
  • the opening 14 of the can 10 is covered by the cap 20 and is not particularly limited in shape and size.
  • the can 10 has a substantially flat joining plane 18 in the form of a flange projecting by a predetermined length in an outward direction substantially perpendicular to the side wall 16. This flange-shaped joining plane 18 is to ensure a stable joining area with respect to the thickness of the can 10.
  • the can 10 and / or the cap 20 may be configured such that the contents such as the electrode assembly 40 and the electrolyte, which are accommodated in the accommodating part 12, do not leak outside or inflow of outside air. And a material that ensures airtightness to the extent that the contents can operate normally against the pressure difference, physical, chemical, and climatic environmental impact between the inside and the outside.
  • can 10 and / or cap 20 has a thermal conductivity of at least about 10 kcal / mh ° C. (20 ° C.), a tensile strength of at least about 5 kgf / mm 2 , and a thickness of at least about 30 ⁇ m.
  • the electrode assembly 40 has a structure in which a cathode plate / separator / cathode plate is sequentially disposed (for example, a lamination type in which a plurality of unit electrodes are stacked or a jelly-roll type in which unit electrodes are wound), and the overall shape is a cuboid or coin type. It may be modified in various ways.
  • the positive electrode plate has a structure in which a positive electrode active material containing lithium-based oxide as a main component is applied to at least one side of the positive electrode current collector of an aluminum thin plate, and the negative electrode plate has at least one side of the negative electrode current collector of a copper thin plate. It is a structure to which the negative electrode active material which has a carbon material as a main component was apply
  • the positive electrode plate and the negative electrode plate each have a positive electrode tab and a negative electrode tab.
  • the positive electrode tab and the negative electrode tab may be disposed at different positions according to polarity, and the positive electrode tab and the negative electrode tab portion protruding from the positive electrode plate and the negative electrode plate may be attached with an insulating tape to prevent a short circuit between the electrode plates.
  • the separator uses a porous polymer film for separating the positive electrode plate and the negative electrode plate.
  • the structure of the electrode assembly 40 composed of the positive plate / separator / cathode plate can be modified by any person skilled in the art.
  • FIG. 2 is a plan view schematically illustrating the cap of FIG. 1.
  • FIG. 2 is a plan view schematically illustrating the cap of FIG. 1.
  • the cap 20 covers and seals the opening 14 of the can 10, and the cap 20 overlaps the joining plane 18 of the can 10. 22).
  • the cap 20 has a plate shape as a whole, and may have a through hole (not shown) through which an electrode terminal (not shown) of the electrode assembly 40 may penetrate. An insulation material, a terminal plate (not shown) may be included.
  • the cap 20 may be provided with an electrolyte injection hole (not shown) for injecting electrolyte into the can 10 in a sealed state.
  • the can 10 and / or the cap 20 is preferably plated with nickel or copper in order to improve the bonding property with the fusion bonding member 30.
  • the melt bonding member 30 has a melting point lower than the melting point of the metallic can 10 and the cap 20, and the second bonding plane 22 of the bonding plane 18 and the cap 20 of the can 10. Is located between the junctions,
  • the melt bonding member 30 has a melting point that is lower than the melting point of the base material, and has a melting point without fear of internal heat transfer, and thus can be expected to have sufficient bonding strength due to its excellent bonding property with the base material. Affinity) and may be selected from various kinds of metals and metal compounds in consideration of the property of melting and releasing the sealing property when reaching a specific temperature. On the other hand, the reason for using the alloy as the fusion bonding member 30, can lower the melting point than the single metal, improve the mechanical strength, lower the price, can be expected to bond affinity with the base metal That is, it can have various liquidus-solidus temperature ranges. Available types and features of the fusion bonding member 30 are as shown in Table 1 below (type 1 of the fusion bonding member).
  • the fusion bonding member 30 is described as including lead, but it is apparent to those skilled in the art that lead or alloy thereof may not be selected in consideration of environmentally friendly factors.
  • the melt bonding member 30 has a melting point between about 100 ° C and about 450 ° C, more preferably between about 138 ° C and about 250 ° C.
  • the melt bonding member 30 selects, for example, Sn-8Zn-3Bi having a melting point of 190 ° C. This is because in the conventional method of welding by plasma welding, a high heat of 1000 ° C. or more is applied directly to the exterior material, a lot of energy / time is required to achieve the process conditions, the electrolyte is separated at 100 ° C., and the separator is formed at 120 to 140 ° C. This is because major components of the secondary battery 100 may be thermally damaged during the welding process, such as blocking pores and breaking the separator at 150 to 180 ° C.
  • the fusion bonding member 30 has a low temperature capable of melting, preferably avoiding the high heat source is disposed in the process, and the general purpose equipment (e.g. For example, it is preferable to use a heater, a jig).
  • melt bonding member 30 is not released or weakened in the general operating range (eg, less than 80 °C) of the secondary battery 100, the generalized heat-resistant harsh test standard (UL standard for lithium ion battery) 130 °C), which maintains hermetic seal so as not to cause leakage unless the internal pressure is rapidly increased (in the range where the insulation of the separator is not broken so that an internal short circuit does not occur), but it is known to pose a fatal danger to the safety of the battery. It is desirable that the sealability be sufficiently released before reaching the internal thermal runaway onset temperature (eg, about 200 ° C.) of the positive electrode material.
  • the generalized heat-resistant harsh test standard UL standard for lithium ion battery 130 °C
  • vent mechanism of the conventional secondary battery adhere means are provided in some narrow area of the exterior material
  • the vent mechanism even if the vent mechanism is operated, the discharge through a sufficient area compared to the ejection pattern of the internal material is prevented. It is difficult, and moreover, the vent hole is clogged by the ejecting material.
  • the intended wide area can be utilized as the vent mechanism, and the temperature and the endurance pressure can be easily adjusted within such a range.
  • the temperature / pressure range selection of the fusion bonding member 30 may refer to FIG. 3.
  • FIG. 3 Those skilled in the art will understand that the temperature and pressure of FIG. 3 are merely exemplary, and that the optimum values can be varied in various ways depending on the product design.
  • the melt bonding member 30 according to the embodiments of the present invention may be melted by local heating.
  • the melt bonding member 30 By locally heating the melt bonding member 30 as described above, it is possible to reduce the possibility of major components of the secondary battery 100 being damaged by heat for heating the melt bonding member 30.
  • a method of locally heating the molten bonding member 30 may include contact resistance, high frequency sealing, laser, light beam, pulse heat, or hot-ram. Either way can be used.
  • the contact resistance method uses the same principle as that of resistance welding, and is melted by heat generated by contact resistance between at least one of the can 10 or the cap 20 and the fusion bonding member 30.
  • the bonding member 30 is melted.
  • it is preferable that the can 10 and the cap 20 are pressurized from both sides in the molten state toward the melt bonding member 30 in the molten state.
  • the fusion bonding member 30 may be melted by a resistance seam welder (not shown) having a welding electrode in contact with the surface of the can 10 and the cap 20. Since the resistance seam welder is the same as or similar to that used for general resistance seam welding, a detailed description thereof will be omitted.
  • the melt bonding member 30 When the melt bonding member 30 is melted by the contact resistance, the melt bonding member 30 may have a resistance of the can 10 and the cap 20, a welding electrode contacting the can 10 and the cap 20 (not shown). C) and the contact resistance between the can 10 and the cap 20 and the heat generated by the resistance between the melt bonding member 30 and at least one of the can 10 or the cap 20. . At this time, the resistance between at least one of the can 10 or the cap 20 and the melt bonding member 30 is preferably larger than the remaining resistance.
  • the contact resistance between the welding electrode contacting the can 10 and the cap 20 and the can 10 and the cap 20 can be controlled according to the material, shape or size of the welding electrode.
  • the molten state of the fusion bonding member 30 may be controlled by controlling the magnitude or duration of the welding current supplied to the welding electrode or the pressure applied by the welding electrode to the can 10 and the cap 20.
  • the welding electrode may have a disk shape, and may press the can 10 and the cap 20 continuously while rotating while being in contact with the can 10 and the cap 20.
  • the method of locally heating the fusion bonding member 30 by high frequency sealing uses a high frequency sealer or a high frequency sealer, and uses high frequency induction heating.
  • a high frequency sealer or a high frequency sealer uses high frequency induction heating.
  • the permanent magnet in the center of the coil shape is inserted and removed, the magnetic field is changed and an electromagnetic induction phenomenon occurs in which the current flows in the conductor.
  • an alternating magnetic flux is generated by flowing an alternating current through the coil instead of the permanent magnet.
  • Induced current eddy current
  • the method using high frequency heating or high frequency sealer has a very short heating time, uniformly manages heating temperature, heating time and heating output, and can effectively prevent overheating.
  • the method using a laser is a method of heating the fusion bonding member 30 in a non-contact manner, and it is preferable to use a YAG laser.
  • YAG laser is advantageous in the automation of equipment because the wavelength is as short as 1.06 ⁇ m and can be absorbed well in the molten bonding member 30, and can be transmitted in the quartz fiber (fiber).
  • the method using the light beam is also non-contact, and a light source may use a xenon lamp or a halogen lamp with high brightness.
  • Pulse heat is a contact heating method, it can be said that the application of resistance welding. Pulse heating is to press the contact of the tip (heater material) of various shapes to the junction of the can 10 and the cap 20, and to flow the current through the tip for a short time and to utilize the joule heat of the tip generated at that time Can be heated. Since the tip contacted by the pulse heating generates heat only during the current flow time, the melting and cooling of the molten bonding member 30 can be performed at almost the same time, and thus the influence of the heat of the main components of the battery is reduced. It can be said little.
  • the material of the tip is high resistance, excellent workability, molybdenum (Mo) or tungsten (W) that does not melt in the molten bonding member 30 may be used.
  • the hot-ram method is also a contact heating method, which is a method of contact press soldering from a ram that is always heated by a sheath heater to maintain a high temperature.
  • This method can be used when joining pre-soldered parts and is suitable for simultaneous heating of multiple conductors of wide width, such as flexible substrates, because they can heat temperatures uniformly over a wide range. . Accordingly, the hot ram method may be applied even when the can 10 and the cap 20 formed of a conductor having a thin thickness and a large area are heated at the same time.
  • the melting bonding member 30 illustrated in Table 1 has a melting point of about 100 ° C. to about 450 ° C., but is largely different from a general operating temperature range (less than 80 ° C.) of the secondary battery 100. There is also some difference from the thermal runaway onset temperature (200 ° C.) of the positive electrode material. Therefore, the present invention may use a melt bonding member 30 having a lower melting point and having a different composition in addition to the melt bonding member 30 having the composition shown in Table 1 above.
  • the melt bonding member 30 of the present invention may be melted at 10 ° C to 120 ° C. If the melt bonding member 30 is melted at 10 ° C. to 120 ° C., the melt bonding member 30 may be formed even before the thermal runaway temperature of the positive electrode material is reached or even if the temperature is slightly higher than the general operating temperature range of the secondary battery 100. 30) may be melted. However, even in the case of having such a melting point, it is preferable to exclude the melt bonding member 30 having a melting point lower than the general operating temperature range of the secondary battery 100.
  • the molten bonding member 30 having a low melting point is formed of gallium (Ga), indium (In), cadmium (Cd), or bismuth (Bi), as illustrated in Table 2 below (Type 2 of the melting bonding member). It may include at least one.
  • the melt bonding member 30 is used by using a reflow method used for surface mounting technology (SMT). Can dissolve.
  • SMT surface mounting technology
  • the can 10 and the cap 20 may be bonded using a reflow apparatus (not shown) including a heating furnace and a conveyor transferred in the heating furnace.
  • the fusion bonding member 30 may be supplied into the heating furnace by the conveyor and melted while being applied to the bonding portion of the can 10 and the cap 20.
  • the melt bonding member 30 applied to the can 10 and the cap 20 may be melted and solidified while undergoing preheating, main heating (reflow heating), and cooling while passing through a heating furnace.
  • main heating reflow heating
  • cooling while passing through a heating furnace.
  • hot air or infrared rays may be supplied into the furnace.
  • the hot air method may supply the hot air to heat the molten bonding member 30 by convection the hot air inside the heating furnace. Without sufficient convection, the heating rate can be lowered and the heating time can be relatively long. In order to increase the heating rate, it is desirable to use forced convection and optimized gas flow together.
  • temperature uniformity of the surface of the can 10 and the cap 20 may be changed by the flow of hot air. Therefore, it is necessary to appropriately control the position of the heater that heats the air and the circulation method of the hot air so that the surfaces of the can 10 and the cap 20 are uniformly heated.
  • infrared rays operating at wavelengths of 1 ⁇ m or less to 6 ⁇ m may be radiated into a heating furnace. Compared with a hot air system, heating by infrared rays may cause overheating.
  • the melting bonding member 30 having a low melting point using the heat of condensation.
  • heat of condensation may be generated, and the can 10 and the cap 20 are formed using the heat of condensation.
  • heat the fusion bonding member 30 applied to the bonding portion of the When the molten bonding member 30 is heated by the heat of condensation, there is an advantage in that thermal damage of the main battery components of the secondary electrode 100 may be prevented.
  • the secondary battery 100 comprises the steps of providing a metallic can 10 including an accommodating part and an opening part in which an electrode assembly and an electrolyte are accommodated together, and the can 10 can be sealed.
  • Providing a metallic cap 20 located in the opening of the 10, having a melting point lower than the melting point of the can 10 and the cap 20 and melting between the can 10 and the junction of the cap 20 It can be prepared by the method of manufacturing a secondary battery 100 comprising the step of providing a bonding member 30 and the melting and melting of the bonding member 30 and bonding the can 10 and the cap 20. have.
  • the step of bonding the can 10 and the cap 20 may be performed by locally heating the melt bonding member 30 or by heating the melt bonding member 30 by a reflow method.
  • Local heating of the molten bonding member 30 may use any one of contact resistance, high frequency sealing, laser, light beam, pulse heat or hot-ram.
  • the molten bonding member 30 can be locally heated. By locally heating the molten bonding member 30 in this manner, it is possible to reduce the possibility of major components of the battery being adversely affected by heat.
  • a YAG laser absorbed by the fusion bonding member 30 may be used for heating using a laser, and a xenon lamp or halogen lamp having a high brightness may be obtained when heating with a light beam. have.
  • the melt bonding member 30 when the melt bonding member 30 is melted at 10 ° C to 120 ° C, the melt bonding member 30 may be melted by applying a reflow method.
  • the fusion bonding member 30 may include at least one of gallium (Ga), indium (In), cadmium (Cd) or bismuth (Bi).
  • the molten bonding member 30 having a low melting point When the molten bonding member 30 having a low melting point is heated by using a reflow method, the molten bonding member 30 may be melted using convection hot air, infrared rays, or condensation heat. At this time, a cooling jig may be used to prevent heat generated by hot air, infrared rays or condensation heat that melts the fusion bonding member 30 from being transmitted to the main battery elements of the battery.
  • the bonding or sealing state between the can 10 and the cap 20 is controlled according to the melting point of the fusion bonding member 30.
  • the bonding or sealing state between the can 10 and the cap 20 can be controlled by the melting point of the fusion bonding member.
  • the sealing or bonding strength between the can 10 and the cap 20 may be adjusted by the area of the fusion bonding member 30 interposed between the can 10 and the cap 20.
  • FIG. 4 is a perspective view schematically showing an example of a melt bonding member 30 according to a preferred embodiment of the present invention.
  • the fusion bonding member 30 is in contact with the bonding plane 18 of the can 10 and the second bonding plane 22 of the cap 20 to be melted.
  • the cross section is pre-formed into an annular shape that is rectangular in shape and forms a substantially rectangular closed loop for post solidification.
  • the molten bonding member 30 is formed into a solid phase, including a method as described above, by direct heating by a hot wire heater (not shown), ultrasonic heating by high frequency, heating by resistance heat, and by a jig (not shown). The joint between the can 10 and the cap 20 is sealed while being pressed and melted by the applied pressure.
  • 5 and 6 are schematic diagrams respectively illustrating a process of sealing a secondary battery according to a preferred embodiment of the present invention.
  • the can 10 containing the electrode assembly 40 is inserted into the opening of the lower jig 52 so that the end of the lower jig 52 supports the flange of the can 10.
  • the melt bonding member 30 is positioned on the bonding plane 18 of the can 10 and the cap 20 is folded thereon to press the upper jig 54 at the top of the cap 20 to pressurize to a predetermined pressure and temperature. 6, as the melt bonding member 30 is solidified after melting, the cap 20 is firmly fixed to the can 10.
  • FIG. 7 and 8 are cross-sectional views schematically illustrating secondary batteries according to another embodiment of the present invention.
  • the rechargeable battery 200 may be preformed in at least one of the bonding plane 118 of the can 110 and the second bonding plane 122 of the cap 120.
  • the receiving grooves 119 and 123 are provided to accommodate the molten bonding member 30. That is, according to the present embodiment, by placing the can 110 and the cap 120 so that the fusion splicing member 30 can be inserted into the receiving grooves 119 and 123 to be considered by the jig as described above or by those skilled in the art. Pressing the can 110 and the cap 120 to a predetermined pressure and temperature using other devices may be used to melt the fusion bonding member 30 to melt in the bonding plane 118 and the second bonding plane 122. When the bonding member 30 is melted and solidified, the can 110 and the cap 120 are tightly sealed or bonded.
  • the secondary battery 200 may be a molten bonding member 30 previously formed in at least one of the bonding plane 118 of the can 110 and the second bonding plane 122 of the cap 120.
  • Flow facilitation (not shown) may be formed to allow even flow between the junction of the can 10 and the cap 20 in the molten state.
  • the flow promoting part may have a concave-convex or embossing form formed on at least one side of the junction of the can 10 or the cap 20.
  • the flow promoting portion may be formed to have a large surface roughness compared to its surroundings.
  • the receiving grooves 119, 123 of FIGS. 7 and 8 are shown as recessed in the joining surfaces 118, 122 of the can 110 and the cap 120 at right angles, as shown in FIG. 9.
  • the groove 210 and the recess 220 may be deformed to one of ordinary skill in the art such as a recessed groove 223 formed in a recess on at least one surface of the joining surfaces of the can 210 and the cap 220.
  • the melt bonding member 230 may be pre-molded in a circular cross section.
  • FIG. 10 is a perspective view schematically illustrating a sealing assembly process of a rechargeable battery according to another exemplary embodiment of the present invention.
  • the can 310 includes an extension 311 extending substantially vertically from the bonding plane 318, and the cap 320 is It is formed stepped from the edge of the cap plate 321 and is in contact with the bonding plane 318 of the can 310 and its end is in contact with the side wall of the extension 319 to form a predetermined space to melt the liquid in the space. It is provided with a step 323 that can accommodate the bonding member 330.
  • the cap 320 is positioned in the state in which the electrode assembly 40 is accommodated inside the can 310, and then in the space formed by the extension 319 and the step 323, the molten state ( When the melt bonding member 330 of the liquid phase is poured and the melt bonding member 330 is solidified, the can 310 and the cap 320 may be sealed and bonded.
  • a gas cat (not shown) may be interposed at a portion where the can 310 and the cap 320 contact each other.
  • FIG. 11 is a perspective view schematically illustrating a bonding process of a secondary battery according to still another embodiment of the present invention.
  • the secondary battery according to the present embodiment uses the can 10 and the cap 20 illustrated in FIGS. 1 and 2, and uses the can 10 using a solder paste printer 401 known in the art.
  • the can 10 and the cap 20 by printing the molten bonding member 430 in a paste state on the bonding surface 18 of the paste 10 and then heating and pressurizing it to a predetermined temperature and a predetermined pressure with the cap 20 placed thereon. ) Can be melt bonded.
  • the secondary battery according to the preferred embodiments of the present invention is particularly useful when applied to a thin wide-area square battery (when the start-end distance of the junction is long or the area is large), but on the other hand
  • various batteries such as secondary batteries, nickel-cadmium batteries, and nickel hydrogen batteries, such as cylindrical batteries, coin-type batteries, and the like, may be applied to various types of exterior materials or bonding structures or shapes thereof. .
  • the present invention can be applied to secondary batteries or energy storage devices.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)

Abstract

La présente invention concerne une batterie secondaire, comprenant : une boîte métallique, comprenant une partie ouverte et une partie de logement servant à recevoir un ensemble électrode et un électrolyte ; un couvercle métallique, qui est placé sur la partie ouverte de la boîte afin de sceller la boîte ; et un élément de jonction fusible, qui présente un point de fusion inférieur au point de fusion de la boîte et du couvercle, et qui joint la boîte et le couvercle lorsqu'il est agencé dans la partie de jonction entre la boîte et le couvercle. L'élément de jonction fusible fond par échauffement local afin de joindre la boîte et le couvercle.
PCT/KR2012/003485 2011-05-27 2012-05-03 Batterie secondaire, et procédé de fabrication associé Ceased WO2012165767A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020110050406A KR101272178B1 (ko) 2011-05-27 2011-05-27 이차 전지 및 그 제조 방법
KR10-2011-0050406 2011-05-27

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WO2012165767A2 true WO2012165767A2 (fr) 2012-12-06
WO2012165767A3 WO2012165767A3 (fr) 2013-02-07

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WO (1) WO2012165767A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3422435A4 (fr) * 2017-01-06 2019-06-19 LG Chem, Ltd. Dispositif de fabrication d'élément de batterie utilisant un chauffage par induction
US20230143801A1 (en) * 2021-11-09 2023-05-11 Sk Innovation Co., Ltd. Method of manufacturing battery module
EP4166268A4 (fr) * 2020-08-18 2024-01-17 LG Energy Solution, Ltd. Appareil de soudage pour la fabrication d'une batterie secondaire, et procédé de soudage l'utilisant

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
CN109742271B (zh) * 2018-11-23 2022-02-15 深圳市鑫来旺电子科技有限公司 一种光伏电源模块的防水包装外壳及密封方法

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JPH08203482A (ja) * 1995-01-25 1996-08-09 Matsushita Electric Ind Co Ltd 全固体リチウム電池
JPH1147920A (ja) * 1997-07-24 1999-02-23 Showa Alum Corp アルミニウム製電池ケースの接合方法
JP2000090893A (ja) * 1998-09-17 2000-03-31 Japan Storage Battery Co Ltd 電池及び電池の製造方法
KR101152757B1 (ko) * 2009-07-15 2012-06-18 주식회사 루트제이드 이차 전지 및 에너지 저장 장치

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3422435A4 (fr) * 2017-01-06 2019-06-19 LG Chem, Ltd. Dispositif de fabrication d'élément de batterie utilisant un chauffage par induction
US10863590B2 (en) 2017-01-06 2020-12-08 Lg Chem, Ltd. Battery cell manufacturing device using induction heating
EP4166268A4 (fr) * 2020-08-18 2024-01-17 LG Energy Solution, Ltd. Appareil de soudage pour la fabrication d'une batterie secondaire, et procédé de soudage l'utilisant
US20240269783A1 (en) * 2020-08-18 2024-08-15 Lg Energy Solution, Ltd. Welding apparatus for manufacturing secondary battery and welding method using same
US20230143801A1 (en) * 2021-11-09 2023-05-11 Sk Innovation Co., Ltd. Method of manufacturing battery module

Also Published As

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WO2012165767A3 (fr) 2013-02-07
KR101272178B1 (ko) 2013-06-24
KR20120131914A (ko) 2012-12-05

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