WO2022215881A1 - 이차전지 및 이의 제조 방법 - Google Patents
이차전지 및 이의 제조 방법 Download PDFInfo
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- WO2022215881A1 WO2022215881A1 PCT/KR2022/003519 KR2022003519W WO2022215881A1 WO 2022215881 A1 WO2022215881 A1 WO 2022215881A1 KR 2022003519 W KR2022003519 W KR 2022003519W WO 2022215881 A1 WO2022215881 A1 WO 2022215881A1
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- discharge hole
- safety vent
- secondary battery
- electrode
- block
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- 230000004913 activation Effects 0.000 claims description 37
- 238000007789 sealing Methods 0.000 claims description 37
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 7
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Images
Classifications
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
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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
- H01M10/04—Construction or manufacture in general
- H01M10/049—Processes for forming or storing electrodes in the battery container
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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
- 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
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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
- 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
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
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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
- 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
- H01M50/167—Lids or covers characterised by the methods of assembling casings with lids by crimping
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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
- 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
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/308—Detachable arrangements, e.g. detachable vent plugs or plug systems
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
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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
- 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
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
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- H01M4/0438—Processes of manufacture in general by electrochemical processing
- H01M4/044—Activating, forming or electrochemical attack of the supporting material
- H01M4/0445—Forming after manufacture of the electrode, e.g. first charge, cycling
- H01M4/0447—Forming after manufacture of the electrode, e.g. first charge, cycling of complete cells or cells stacks
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- 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
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- 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 secondary battery and a manufacturing method thereof, and more particularly, to a secondary battery capable of discharging gas generated in an activation process and a manufacturing method thereof.
- lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries, which have advantages such as high energy density, discharge voltage, and output stability.
- secondary batteries are classified according to the structure of the electrode assembly in which a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode are stacked.
- a jelly roll-type electrode assembly in which a long sheet-shaped anode and anode are wound with a separator interposed therebetween, and a plurality of cathodes and anodes cut into units of a predetermined size are sequentially stacked with a separator interposed therebetween. and stacked electrode assemblies.
- the secondary battery includes a cylindrical battery in which the electrode assembly is embedded in a cylindrical case, a prismatic battery in which the electrode assembly is embedded in a prismatic case, and a pouch in which the electrode assembly is embedded in a pouch-shaped case of an aluminum laminate sheet. It can be classified as a type battery.
- the secondary battery can be used appropriately in the market when it has safety while satisfying the performance suitable for the intended use.
- design factors are determined by considering these performance and safety aspects at the same time. Batteries that have been designed and manufactured are subjected to safety evaluations such as overcharge, overdischarge, impact, nail test, and hot box as well as performance evaluation such as lifespan, high rate characteristics, and high/low temperature characteristics.
- Cylindrical secondary batteries among various types of secondary batteries prevent additional reactions by blocking current between electrode terminals and electrode tabs when gas is rapidly generated inside the secondary battery in an abnormal state such as overcharging and the internal pressure exceeds a certain level. and a current interrupt device (CID).
- CID current interrupt device
- FIG. 1 is a partial cross-sectional view showing a cross-section of an upper portion of a conventional cylindrical secondary battery.
- the electrode assembly 20 is accommodated in the cylindrical case 30 , and the cap assembly 40 is mounted on the open upper portion of the cylindrical case 30 to manufacture the cylindrical secondary battery 10 . .
- the electrode assembly 20 may be a jelly roll type electrode assembly in which the first electrode 21 , the second electrode 22 , and the separator 23 are wound.
- the cap assembly 40 may include a top cap 41 , a safety vent 42 for internal pressure drop, and a current interruption member 43 (Current Interrupt Device, CID).
- the upper cap 41 and the safety vent 42 may form a structure in close contact with each other, and the safety vent 42 may be connected to the center of the current blocking member 43 .
- a first electrode tab 21t protruding from the first electrode 21 may be connected to a lower end of the current blocking member 43 .
- the first electrode 21 may be a positive electrode
- the first electrode tab 21t may be a positive electrode tab.
- the upper cap 41 may be electrically connected to the electrode assembly 20 by being directly or indirectly connected to the safety vent 42, the current blocking member 43, and the first electrode tabs 21t, It can function as an electrode terminal.
- a gasket 70 for sealing between the cap assembly 40 and the cylindrical case 30 and a CID gasket 80 surrounding the edge of the current blocking member 43 may be disposed.
- FIG. 2 is a partial cross-sectional view illustrating a state when the internal pressure of the cylindrical secondary battery of FIG. 1 is increased.
- the shape of the safety vent 42 is reversed, and the current blocking member 43 is separated to supply current.
- the current blocking member 43 is divided into a portion 43a connected to the safety vent 42 and a portion 43b connected to the first electrode tab 21t, the upper cap 41 functioning as an electrode terminal, and Current flow between the first electrode tabs 21t is blocked.
- the safety vent 42 is opened while the notch portion of the safety vent 42 is cut, and the internal gas is discharged.
- the structural rigidity is excellent, but when the safety vent 42 is opened and the internal gas is discharged, the spatial part is formed by the top cap 41 There is a disadvantage in that the safety vent 42 is not fully opened for heat, so that the gas discharge is limited.
- a lithium secondary battery performs a formation process, that is, an activation process during a manufacturing process.
- the activation process is a process of activating the battery by performing charging and discharging after assembling the battery.
- a solid electrolyte interface (SEI) film is formed on the surface of the negative electrode. is formed
- SEI solid electrolyte interface
- the conventional cylindrical secondary battery 10 it is not easy to discharge the gas generated in the activation process because the seal must be maintained after the electrolyte is injected. If the gas generated in the activation process is not discharged, it may interfere with the cell reaction between the positive electrode and the negative electrode, which may adversely affect the initial capacity of the battery, the formation of a stable solid electrolyte interface (SEI), and life performance characteristics. In addition, the gas may not be discharged, which may affect the results of the above-described safety evaluation.
- SEI solid electrolyte interface
- An object of the present invention is to provide a secondary battery capable of discharging gas after a pre-activation process or an activation process, and a method for manufacturing the same.
- a secondary battery includes an electrode assembly; a battery case housing the electrode assembly and having an open top; and a cap assembly coupled to an open upper portion of the battery case, wherein the cap assembly includes a safety vent exposed to the outside from the top.
- a discharge hole is formed in the safety vent, and a block is filled in the discharge hole.
- the block may be joined to the discharge hole by ball welding.
- An upper end of the battery case may be bent to form a crimping portion surrounding the outer periphery of the safety vent.
- the safety vent may include a curling portion bent at the outer peripheral portion of the safety vent, and the crimping portion may be wrapped around the curling portion to be crimped together.
- the cap assembly may include a current blocking member positioned below the safety vent, and a central portion of the safety vent and the current blocking member may be connected to each other.
- the discharge hole may be located between the central portion and the outer peripheral portion of the safety vent.
- a method of manufacturing a secondary battery includes the steps of accommodating an electrode assembly in a battery case having an open top; coupling a cap assembly having a discharge hole formed at an open upper portion of the battery case; a gas discharging step of discharging the gas inside the battery case to the outside through the discharge hole; and a sealing step of filling the discharge hole with a block.
- the cap assembly includes a safety vent exposed to the outside from an upper end, and the discharge hole is formed in the safety vent.
- the block may be joined to the discharge hole by ball welding.
- the diameter of the block may be greater than the inner diameter of the discharge hole, and the block may be fired into the discharge hole, and the block may be inserted into the discharge hole.
- the coupling of the cap assembly may include forming a crimping part surrounding the safety vent by bending an upper end of the battery case.
- the safety vent may include a curling portion bent at an outer peripheral portion of the safety vent, and a crimping coupling may be made such that the crimping portion surrounds the curling portion.
- the method of manufacturing the secondary battery may further include a pre-activation step of activating the electrode assembly in advance.
- the gas generated in the pre-activation step may be discharged to the outside through the discharge hole.
- the method of manufacturing the secondary battery may further include an activation step of activating the electrode assembly.
- the activation step may be performed after the sealing step.
- the manufacturing method of the secondary battery may include a temporary sealing step of temporarily sealing the discharge hole; an activation step of activating the electrode assembly; and a temporary sealing releasing step of releasing the temporary sealing state of the discharge hole.
- the gas generated in the activation step may be discharged to the outside through the discharge hole.
- the step of degassing may occur simultaneously with the step of temporarily unsealing or immediately after the step of temporarily unsealing.
- the sealing step may be performed after the gas discharging step.
- the safety vent can be completely opened when the internal pressure rises, which can be effective for gas discharge.
- FIG. 1 is a partial cross-sectional view showing a cross-section of an upper portion of a conventional cylindrical secondary battery.
- FIG. 2 is a partial cross-sectional view illustrating a state when the internal pressure of the cylindrical secondary battery of FIG. 1 is increased.
- FIG. 3 is an exploded perspective view of a secondary battery according to an embodiment of the present invention.
- FIG. 4 is a cross-sectional perspective view of a safety vent included in the secondary battery of FIG. 3 .
- FIG. 5 is a cross-sectional view of an upper portion of a secondary battery according to an embodiment of the present invention.
- 6 to 9 are cross-sectional views for explaining a method of manufacturing a secondary battery according to an embodiment of the present invention.
- 10 to 13 are cross-sectional views for explaining a method of manufacturing a secondary battery according to another embodiment of the present invention.
- a part of a layer, film, region, plate, etc. when a part of a layer, film, region, plate, etc. is said to be “on” or “on” another part, it includes not only cases where it is “directly on” another part, but also cases where another part is in between. . Conversely, when we say that a part is “just above” another part, we mean that there is no other part in the middle.
- the reference part means to be located above or below the reference part, and it means to be located “on” or “on” in the direction opposite to the gravity. not.
- planar view it means when the target part is viewed from above, and when it is referred to as “cross-section”, it means when the cross-section obtained by cutting the target part vertically is viewed from the side.
- FIG. 3 is an exploded perspective view of a secondary battery according to an embodiment of the present invention.
- 4 is a cross-sectional perspective view of a safety vent included in the secondary battery of FIG. 3 .
- 5 is a cross-sectional view of an upper portion of a secondary battery according to an embodiment of the present invention.
- FIG. 5 is a cross-sectional view showing the upper part of the cross-section taken along the xz plane after each component of the secondary battery of FIG. 3 is assembled.
- a secondary battery 100 includes an electrode assembly 200; a battery case 300 in which the electrode assembly 200 is accommodated and an upper part thereof is opened; and a cap assembly 400 coupled to the open upper portion of the battery case 300 .
- the electrode assembly 200 may include a first electrode 210 , a second electrode 220 , and a separator 230 .
- the first electrode 210 , the second electrode 220 , and the separator 230 may be wound together to form the jelly roll-type electrode assembly 200 .
- the separator 230 may be interposed between the first electrode 210 and the second electrode 220 .
- the first electrode 210 may be formed by coating an electrode active material on the first electrode current collector. Meanwhile, the first electrode tab 213 may be attached to a portion of the first electrode current collector where the electrode active material is not applied and the first electrode current collector is exposed by welding or the like.
- the second electrode 220 may be formed by coating an electrode active material on the second electrode current collector. Meanwhile, the second electrode tab 223 may be attached to a portion of the second electrode current collector where an electrode active material is not applied and the second electrode current collector is exposed by welding or the like.
- the first electrode 210 may be an anode
- the second electrode 220 may be a cathode
- the first electrode tab 213 may be a positive electrode tab
- the second electrode tab 223 may be a negative electrode tab.
- the first electrode tab 213 and the second electrode tab 223 may protrude in opposite directions. 3
- the first electrode tab 213 may protrude in the direction (z-axis direction) in which the cap assembly 400 is located
- the second electrode tab 223 is the bottom of the battery case 300 . It may protrude in the direction (-z-axis direction) in which the sub is located.
- the battery case 300 is a structure accommodating the electrode assembly 200 impregnated with the electrolyte, and may include a metal material and may be a cylindrical case.
- the cap assembly 400 includes a safety vent 410 exposed to the outside from the top.
- a discharge hole 410H is formed in the safety vent 410
- the block 500 is filled in the discharge hole 410H.
- the discharge hole 410H and the block 500 will be described later.
- the cap assembly 400 may include a current interrupting member 420 (Current Interrupt Device, CID) positioned under the safety vent 410 .
- CID Current Interrupt Device
- the cap assembly 400 has a structure in which the top cap is removed, and the safety vent 410 may be exposed from the top to the outside.
- the safety vent 410 is positioned on the current blocking member 420 and may be electrically connected to the current blocking member 420 . Specifically, the central portion of the safety vent 410 and the first portion 421 of the current blocking member 420 to be described later may be physically and electrically connected. A first electrode tab 213 protruding from the first electrode 210 may be connected to a lower end of the current blocking member 420 .
- the safety vent 410 is a thin film structure through which an electric current passes, and may be a disk-shaped plate.
- the safety vent 410 , the current blocking member 420 , and the first electrode tabs 213 are sequentially connected, and the safety vent 410 may function as an electrode terminal guiding the electrical connection of the electrode assembly 200 .
- the current blocking member 420 is a plate member through which current passes, and through-holes 420H for discharging gas may be formed.
- the current blocking member 420 may include a first portion 421 connected to the safety vent 410 and a second portion 422 connected to the first electrode tab 213 , and the first portion 421 . ) may be located at a central portion of the current blocking member 420 , and the second portion 422 may be located at an outer peripheral portion of the current blocking member 420 .
- the shape of the safety vent 410 may be reversed.
- the first portion 421 of the current blocking member 420 is raised together, so that the first portion 421 and the second portion 422 of the current blocking member 420 are separated. can be separated from each other.
- a space between the first part 421 and the second part 422 may be designed to have a rather weak strength.
- the current between the safety vent 410 and the first electrode tab 213 is cut off by the separation of the first part 421 and the second part 422 .
- a notch structure such as a kind of groove may be provided in the safety vent 410 .
- the notch structure is broken or torn, and the safety vent 410 is opened, and internal gas is discharged.
- the safety vent 42 since the upper cap 41 is located on the safety vent 42 , the safety vent 42 cannot be fully opened due to the spatial part being inferior. As a result, the gas cannot be effectively discharged.
- the top cap 41 itself may interfere with gas discharge.
- the safety vent 410 since the safety vent 410 is exposed from the top without the top cap, the shape of the safety vent 410 can be freely reversed or separated when the internal pressure rises. Therefore, compared to the conventional cylindrical secondary battery 10, it is more effective in discharging gas.
- the safety vent 410 is formed with a penetrating discharge hole 410H, and the block 500 is filled in the discharge hole 410H.
- the discharge hole 410H may be a circular through hole, and the block 500 may have a ball shape.
- the ball-shaped block 500 may be joined to the discharge hole 410H by ball welding.
- the ball welding refers to a joining method in which a ball-shaped configuration is fired into a hole having a diameter smaller than that of the ball, and the hole is blocked. That is, as will be described later, the diameter of the ball-shaped block 500 before filling in the discharge hole 410H may be larger than the inner diameter of the discharge hole 410H.
- the lithium secondary battery performs a formation process, ie, an activation process, during a manufacturing process.
- This activation process is generally performed by repeating charging and discharging with a constant current or constant voltage in a certain range.
- a large amount of gas is generated due to the formation of an electrode film or decomposition of moisture inside the cell. Since the gas generated in the activation process is large and continuously reacts with the electrode film, a process for discharging it is required. This is called a degassing or degassing process.
- the secondary battery 100 may discharge a gas generated in a pre-activation process or an activation process, which will be described later, to the outside through an exhaust hole 410H formed in the safety vent 410 .
- the pre-activation process or the activation process is performed on the secondary battery 100 in which the battery case 300 and the cap assembly 400 are combined, and the gas generated in the process is discharged to the outside through the discharge hole 410H.
- discharge When the discharge of the gas is completed, the secondary battery 100 may be sealed by filling the block 500 in the discharge hole 410H by the above-described ball welding method.
- the secondary battery 100 according to the present embodiment can easily discharge the gas inside the battery case 300 , thereby preventing an increase in internal pressure and a decrease in performance. In other words, it is possible to solve problems such as expansion and deformation of the electrode assembly due to gas or lithium precipitation caused by residual gas bubbles.
- the safety vent 410 since the safety vent 410 according to the present embodiment has a structure exposed to the outside according to the removal of the top cap, it is easy to form the discharge hole 410H for discharging gas.
- the conventional cylindrical secondary battery 10 since the upper cap 41 exists, it is structurally quite difficult to block the discharge hole provided for the discharge of the gas again after the gas is discharged.
- discharge holes In order to discharge the gas, discharge holes must be formed in both the top cap 41 and the safety vent 42 , and it is structurally complicated and difficult to block the discharge hole formed in the safety vent 42 due to the existence of the top cap 41 .
- cap assembly 400 since the cap assembly 400 according to the present embodiment has a structure in which the safety vent 410 is exposed at the uppermost end, it is easy to seal the discharge hole 410H after the gas is discharged.
- Ball welding which is a mechanical bonding method described above, may also be applied without limitation.
- the battery case 300 may include a crimping part 300C and a beading part 300B.
- the beading portion 300B refers to a portion in which a portion of the cylindrical battery case 300 is recessed in the center direction of the electrode assembly 200 to prevent the electrode assembly 200 from flowing.
- the crimping part 300C is located above the beading part 300B and refers to a part surrounding the cap assembly 400 , and is for stable coupling of the cap assembly 400 .
- An upper end of the battery case 300 may be bent to surround the cap assembly 400 to form a crimping portion 300C. More specifically, the upper end of the battery case 300 may be bent to surround the outer peripheral portion of the safety vent 410 to form the crimping portion 300C.
- the sealing gasket 700 may be mounted on inner surfaces of the crimping part 300C and the beading part 300B to increase sealing force between the cap assembly 400 and the battery case 300 . That is, the gasket 700 is positioned between the battery case 300 and the cap assembly 400, and the upper end of the battery case 300 is bent to perform crimping to form the crimping part 300C. can That is, mounting of the cap assembly 400 and sealing of the secondary battery 100 may be achieved by crimping.
- the gasket 700 may be positioned between the crimping part 300C and the safety vent 410 .
- a bent portion 410B may be formed in the safety vent 410 according to the present embodiment. Specifically, as shown in FIGS. 4 and 5 , a portion of the safety vent 410 may be bent in an upward direction to form a bent portion 410B. Such a bent portion 410B is formed, it is possible to reduce the deformation transferred to the safety vent 410 during crimping.
- the first portion 421 of the current blocking member 420 is raised together, and the first portion of the current blocking member 420 is raised. 421 and the second portion 422 are separated from each other.
- the bent portion 410B bent in an upward direction may be formed to increase the distance between the safety vent 410 and the current blocking member 420 while minimizing the height of the cap assembly 400 itself.
- the cap assembly 400 in the case of the above-described crimping coupling, strong physical compression may be applied to the cap assembly 400 , and accordingly, there may be a problem in that the cap assembly 400 is damaged.
- the safety vent 410 is damaged in a structure in which the safety vent 410 is exposed without a top cap.
- the thickness of the safety vent 410 is formed to be thicker than before in order to supplement the rigidity of the safety vent 410 , there is a high possibility that the shape reversal or separation of the safety vent 410 may not be implemented properly when the internal pressure rises.
- a curling part 410C (Curling part) is provided in a portion corresponding to the crimping part 300C of the safety vent 410.
- the safety vent 410 may include a curling portion 410C bent at the outer peripheral portion of the safety vent 410 .
- FIGS. 3 and 4 the appearance of the flange part (410F, Flange part) is shown before the curling part (410C) is formed, and in FIG. 5, the flange part (410F) is bent inward and the curling part ( 410C) was formed.
- the crimping part 300C of the battery case 300 may wrap the safety vent 410 with the gasket 700 interposed therebetween, and among them, the crimping coupling is made by surrounding the curling part 410C of the safety vent 410 .
- the central portion of the safety vent 410 is made of one layer, but the outer peripheral portion of the safety vent 410 wrapped around the crimping unit 300C may be made of two layers. That is, by providing the curling part 410C, damage to the safety vent 410 that may occur during crimping is prevented, and at the same time, when the internal pressure rises, the shape of the safety vent 410 does not interfere with reversal or separation. .
- the discharge hole 410H may be located between a central portion and an outer peripheral portion of the safety vent 410 .
- the central portion of the safety vent 410 means a portion connected to the first portion 421 of the current blocking member 420
- the outer peripheral portion of the safety vent 410 is the portion where the curling portion 410C is formed. it means.
- 6 to 9 are cross-sectional views for explaining a method of manufacturing a secondary battery according to an embodiment of the present invention, showing a cross-section of an upper portion of the secondary battery.
- the method of manufacturing a secondary battery includes the steps of accommodating the electrode assembly 200 in the battery case 300 with an open top and the battery case 300 ) and coupling the cap assembly 400 in which the discharge hole 410H is formed in the open upper portion.
- the electrode assembly 200 may be in the form of a jelly roll in which the first electrode 210 , the second electrode 220 , and the separator 230 are wound together, and the battery case 300 is a cylindrical case.
- the electrolyte may be injected into the battery case 300 together with the electrode assembly 200 before the cap assembly 400 is coupled.
- the cap assembly 400 includes a safety vent 410 exposed to the outside from the top, and a discharge hole 410H is formed in the safety vent 410 .
- the specific structures of the safety vent 410 and the discharge hole 410H are described above, and thus will be omitted.
- the coupling of the cap assembly 400 includes bending the upper end 300U of the battery case 300 to form a crimping part 300C surrounding the safety vent 410 .
- the safety vent 410 may include a curling portion 410C bent at the outer peripheral portion of the safety vent 410, and crimping coupling may be made such that the crimping portion 300C surrounds the curling portion 410C. have.
- the curling portion 410C may be formed by bending the upwardly upward flange portion 410F (refer to FIG. 4 ) inward.
- the method of manufacturing the secondary battery according to the present embodiment includes a gas discharging step of discharging the gas inside the battery case 300 to the outside through the discharge hole 410H.
- the method of manufacturing the secondary battery according to the present embodiment may further include a pre-activation step of pre-activating the electrode assembly 200 accommodated in the battery case 300 .
- the pre-activation step is a process performed to discharge gas in advance before the activation step. That is, the pre-activation step is a process performed before the activation step for the purpose of generating gas. For example, in the pre-activation step, only charging at a low state of charge (SOC) may be performed.
- SOC state of charge
- the specific content of the pre-activation step may vary depending on the model, and as another embodiment, may be in the form of repeating charging and discharging with a constant current or constant voltage in a certain range.
- the pre-activation step charging may be performed through the safety vent 410 and the battery case 300 functioning as electrode terminals, or charging and discharging may be repeated.
- the cap assembly 400 is coupled to the open top of the battery case 300 by crimping, the pre-activation step may be performed.
- the gas discharge step the gas generated in the pre-activation step may be discharged from the inside of the secondary battery 100 to the outside through the discharge hole 410H. That is, the pre-activation step is performed in a state in which the discharge hole 410H is opened, and the gas generated in the process may be discharged to the outside through the discharge hole 410H.
- the method of manufacturing the secondary battery according to the present embodiment includes a sealing step of filling the block 500 in the discharge hole 410H.
- the block 500 may be joined to the discharge hole 410H by ball welding.
- the discharge hole 410H may be a circular through hole, and the block 500 may have a ball shape.
- the ball-shaped block 500 may be joined to the discharge hole 410H by ball welding.
- the diameter d2 of the ball-shaped block 500 may be larger than the inner diameter d1 of the discharge hole 410H.
- This block 500 is strongly fired into the discharge hole 410H, and the block ( 500) may be inserted into the discharge hole 410H.
- the discharge hole 410H may be sealed by using the ball welding of the interference insertion method.
- the secondary battery 100 according to the present embodiment has a structure in which the upper cap is removed and the safety vent 410 is exposed at the uppermost end, the discharge hole 410H is used after the gas is discharged using the ball welding method. ) is easy to seal.
- the method of manufacturing the secondary battery according to the present embodiment may further include an activation step of activating the electrode assembly 200 .
- the activation step may be performed after the sealing step. That is, after the gas generated in the pre-activation step is discharged, the discharge hole 410H is sealed in the sealing step.
- the activation step may be performed by repeating charging and discharging with a constant current or constant voltage within a certain range.
- the activation step is a process of repeatedly performing charging and discharging for the purpose of forming a solid electrolyte interface (SEI) film on the surface of the anode and selecting low voltage.
- SEI solid electrolyte interface
- the secondary battery 100 manufactured according to an embodiment of the present invention proceeds with the pre-activation step and discharges the gas generated in the process, thereby preventing problems such as expansion and deformation of the electrode assembly due to residual gas. It is possible to solve the problem of lithium precipitation caused by residual gas bubbles.
- 10 to 13 are cross-sectional views for explaining a method of manufacturing a secondary battery according to another embodiment of the present invention, showing a cross-section of an upper portion of the secondary battery.
- the method of manufacturing a secondary battery according to another embodiment of the present invention includes the steps of accommodating the electrode assembly 200 in the battery case 300 with an open top and the battery case ( and coupling the cap assembly 400 in which the discharge hole 410H is formed in the open upper portion of the 300 . Since the above steps are the same as those described above, further description will be omitted.
- the method of manufacturing the secondary battery according to the present embodiment may include a temporary sealing step of temporarily sealing the discharge hole 410H.
- the discharge hole 410H may be covered with the cover member 600 to temporarily block the discharge hole 410H.
- the cover member 600 having a portion corresponding to the diameter of the discharge hole 410H may be inserted into the discharge hole 410H.
- the method of manufacturing the secondary battery according to the present embodiment may include an activation step of activating the electrode assembly 200 .
- the activation step may be performed after the temporary sealing step.
- the activation step may be performed by repeating charging and discharging with a constant current or constant voltage within a certain range.
- the activation step is a process of repeatedly performing charging and discharging for the purpose of forming a solid electrolyte interface (SEI) film on the surface of the anode and selecting low voltage.
- SEI solid electrolyte interface
- the method of manufacturing the secondary battery according to the present embodiment may include a temporary sealing releasing step of releasing the temporary sealing state of the discharge hole 410H.
- the discharge hole 410H may be opened again by removing the cover member 600 from the discharge hole 410H.
- the temporary unsealing step may be performed after the activation step.
- the gas generated in the activation step may be discharged to the outside through the discharge hole 410H.
- the step of degassing may occur simultaneously with the step of temporarily unsealing or immediately after the step of temporarily unsealing. In other words, while the discharge hole 410H is reopened through the temporary sealing release step, the gas generated inside the secondary battery 100 during the activation step may be discharged to the outside through the discharge hole 410H.
- a sealing step of filling the block 500 in the discharge hole 410H may be followed.
- the sealing step may be performed after the gas discharging step.
- the block 500 may be joined to the discharge hole 410H by ball welding.
- the discharge hole 410H may be a circular through hole, and the block 500 may have a ball shape.
- the block 500 is strongly fired into the discharge hole 410H, and the block 500 may be inserted into the discharge hole 410H. That is, ball welding may be performed.
- This sealing step may be the same as or similar to that described above with reference to FIG. 8 . Further description of the sealing step will be omitted to avoid repetition of the description.
- the secondary battery 100 manufactured according to another embodiment of the present invention is finally sealed after discharging the gas generated in the activation step, thereby preventing problems such as expansion and deformation of the electrode assembly due to residual gas or residual gas. It is possible to solve the problem of lithium precipitation caused by bubbles.
- a plurality of secondary batteries according to the present embodiment described above may be gathered to form a battery module.
- the battery module may be mounted together with various control and protection systems such as a battery management system (BMS) and a cooling system to form a battery pack.
- BMS battery management system
- the secondary battery, the battery module, or the battery pack may be applied to various devices. Specifically, it may be applied to transportation means such as an electric bicycle, an electric vehicle, a hybrid, etc., but is not limited thereto and may be applied to various devices that can use a secondary battery.
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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)
- Gas Exhaust Devices For Batteries (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
Claims (15)
- 전극 조립체;상기 전극 조립체가 수납되고, 상부가 개방된 전지 케이스; 및상기 전지 케이스의 개방된 상부에 결합되는 캡 조립체를 포함하고,상기 캡 조립체는, 상단에서 외부로 노출된 안전 벤트를 포함하고,상기 안전 벤트에 배출홀이 형성되며,상기 배출홀에 블록이 채워진 이차전지.
- 제1항에서,상기 블록은 상기 배출홀에 볼 용접(Ball welding)으로 접합되는 이차전지.
- 제1항에서,상기 전지 케이스의 상부 일단이 구부러져 상기 안전 벤트의 외주 부분을 감싸며 크림핑부를 형성하는 이차전지.
- 제3항에서,상기 안전 벤트는, 상기 안전 벤트의 상기 외주 부분에서 구부러진 컬링부를 포함하고,상기 크림핑부가 상기 컬링부를 감싸며 크림핑 결합이 이루어지는 이차전지.
- 제4항에서,상기 캡 조립체는 상기 안전 벤트 아래에 위치한 전류 차단 부재를 포함하고,상기 안전 벤트의 중심 부분과 상기 전류 차단 부재가 서로 연결되며,상기 배출홀은, 상기 안전 벤트의 상기 중심 부분과 상기 외주 부분 사이에 위치하는 이차전지.
- 전극 조립체를 상부가 개방된 전지 케이스에 수납하는 단계;상기 전지 케이스의 개방된 상부에 배출홀이 형성된 캡 조립체를 결합하는 단계;상기 전지 케이스 내부의 가스를 상기 배출홀을 통해 외부로 배출하는 가스 배출 단계; 및상기 배출홀에 블록을 채우는 밀봉 단계를 포함하고,상기 캡 조립체는, 상단에서 외부로 노출된 안전 벤트를 포함하며,상기 안전 벤트에 상기 배출홀이 형성되는 이차전지의 제조 방법.
- 제6항에서,상기 밀봉 단계에서, 상기 배출홀에 상기 블록을 볼 용접으로 접합시키는 이차전지의 제조 방법.
- 제7항에서,상기 배출홀의 내경보다 상기 블록의 직경이 더 크고,상기 블록이 상기 배출홀에 발사되어, 상기 블록이 상기 배출홀에 삽입되는 이차전지의 제조 방법.
- 제6항에서,상기 캡 조립체를 결합하는 단계는, 상기 전지 케이스의 상부 일단을 구부려 상기 안전 벤트를 감싸는 크림핑부를 형성하는 단계를 포함하는 이차전지의 제조 방법.
- 제9항에서,상기 안전 벤트는, 상기 안전 벤트의 외주 부분에서 구부러진 컬링부를 포함하고,상기 크림핑부가 상기 컬링부를 감싸도록 크림핑 결합이 이루어지는 이차전지의 제조 방법.
- 제6항에서,상기 전극 조립체를 사전에 활성화하는 프리 활성화(Pre-activation) 단계를 더 포함하고,상기 가스 배출 단계에서, 상기 프리 활성화 단계에서 발생한 가스가 상기 배출홀을 통해 외부로 배출되는 이차전지의 제조 방법.
- 제11항에서,상기 전극 조립체를 활성화하는 활성화 단계를 더 포함하고,상기 활성화 단계는, 상기 밀봉 단계 이후에 이루어지는 이차전지의 제조 방법.
- 제6항에서,상기 배출홀을 임시로 밀봉하는 임시 밀봉 단계;상기 전극 조립체를 활성화하는 활성화 단계; 및상기 배출홀의 임시 밀봉 상태를 해제하는 임시 밀봉 해제 단계를 더 포함하고,상기 가스 배출 단계에서, 상기 활성화 단계에서 발생한 가스가 상기 배출홀을 통해 외부로 배출되는 이차전지의 제조 방법.
- 제13항에서,상기 가스 배출 단계는 상기 임시 밀봉 해제 단계와 동시에 또는 상기 임시 밀봉 해제 단계 직후에 이루어지는 이차전지의 제조 방법.
- 제13항에서,상기 밀봉 단계는, 상기 가스 배출 단계 이후에 이루어지는 이차전지의 제조 방법.
Priority Applications (4)
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CN202280007375.3A CN116472638A (zh) | 2021-04-08 | 2022-03-14 | 二次电池及该二次电池的制造方法 |
EP22784791.0A EP4228072A1 (en) | 2021-04-08 | 2022-03-14 | Secondary battery and manufacturing method of same |
JP2023526971A JP2023548187A (ja) | 2021-04-08 | 2022-03-14 | 二次電池およびその製造方法 |
US18/037,285 US20240006707A1 (en) | 2021-04-08 | 2022-03-14 | Secondary battery and manufacturing method of the same |
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KR1020210045794A KR20220139619A (ko) | 2021-04-08 | 2021-04-08 | 이차전지 및 이의 제조 방법 |
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EP (1) | EP4228072A1 (ko) |
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Citations (5)
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KR100319111B1 (ko) * | 1999-11-25 | 2001-12-29 | 김순택 | 각형 이차 전지의 캡 어셈블리 |
KR20070067779A (ko) * | 2005-12-23 | 2007-06-29 | 삼성에스디아이 주식회사 | 리튬 이차전지 및 그 제조방법 |
CN201069809Y (zh) * | 2007-05-23 | 2008-06-04 | 东莞新能源电子科技有限公司 | 一种柱形锂离子电池结构 |
KR20190056567A (ko) * | 2017-11-17 | 2019-05-27 | 주식회사 엘지화학 | 이차전지 |
KR20200078640A (ko) * | 2017-12-14 | 2020-07-01 | 삼성에스디아이 주식회사 | 원통형 이차 전지 |
-
2021
- 2021-04-08 KR KR1020210045794A patent/KR20220139619A/ko active Search and Examination
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2022
- 2022-03-14 JP JP2023526971A patent/JP2023548187A/ja active Pending
- 2022-03-14 US US18/037,285 patent/US20240006707A1/en active Pending
- 2022-03-14 CN CN202280007375.3A patent/CN116472638A/zh active Pending
- 2022-03-14 EP EP22784791.0A patent/EP4228072A1/en active Pending
- 2022-03-14 WO PCT/KR2022/003519 patent/WO2022215881A1/ko active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100319111B1 (ko) * | 1999-11-25 | 2001-12-29 | 김순택 | 각형 이차 전지의 캡 어셈블리 |
KR20070067779A (ko) * | 2005-12-23 | 2007-06-29 | 삼성에스디아이 주식회사 | 리튬 이차전지 및 그 제조방법 |
CN201069809Y (zh) * | 2007-05-23 | 2008-06-04 | 东莞新能源电子科技有限公司 | 一种柱形锂离子电池结构 |
KR20190056567A (ko) * | 2017-11-17 | 2019-05-27 | 주식회사 엘지화학 | 이차전지 |
KR20200078640A (ko) * | 2017-12-14 | 2020-07-01 | 삼성에스디아이 주식회사 | 원통형 이차 전지 |
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CN116472638A (zh) | 2023-07-21 |
US20240006707A1 (en) | 2024-01-04 |
EP4228072A1 (en) | 2023-08-16 |
KR20220139619A (ko) | 2022-10-17 |
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