WO2022255673A1 - 이차 전지 및 이의 제조 방법 - Google Patents
이차 전지 및 이의 제조 방법 Download PDFInfo
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- WO2022255673A1 WO2022255673A1 PCT/KR2022/006535 KR2022006535W WO2022255673A1 WO 2022255673 A1 WO2022255673 A1 WO 2022255673A1 KR 2022006535 W KR2022006535 W KR 2022006535W WO 2022255673 A1 WO2022255673 A1 WO 2022255673A1
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- cid
- hole
- secondary battery
- electrode
- vent
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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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
- H01M50/50—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
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
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- H01M10/049—Processes for forming or storing electrodes in the battery container
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- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M50/10—Primary casings; Jackets or wrappings
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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 having advantages such as high energy density, discharge voltage, and output stability.
- secondary batteries are classified according to the structure of an electrode assembly having a laminated structure of a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode.
- a jelly roll-type electrode assembly having a structure in which long sheet-type positive and negative electrodes are wound with a separator interposed therebetween, and a plurality of positive and negative electrodes cut in units of a predetermined size are sequentially stacked with a separator interposed therebetween. and stacked electrode assemblies.
- the secondary battery is 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-type case of an aluminum laminate sheet can be classified as type batteries.
- a secondary battery can be suitably used in the market only when it satisfies the performance suitable for the purpose of use and at the same time has safety.
- design factors are determined by simultaneously considering these aspects of performance and safety.
- safety evaluations such as overcharge, overdischarge, impact, nail test, hot box, etc. are conducted along with performance evaluations such as lifespan, high rate characteristics, high/low temperature characteristics, etc. will proceed
- cylindrical secondary batteries rapidly generate gas inside the secondary battery in an abnormal state such as overcharging, and when the internal pressure exceeds a certain level, the current between the electrode terminal and the electrode tab is blocked to prevent additional reactions from occurring.
- It may include a CID (Current Interrupt Device) filter that
- 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 a cylindrical case 30, and the cap assembly 40 is mounted on an open top of the cylindrical case 30 to manufacture a 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 interrupt device (CID) filter 43 .
- 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 CID filter 43 .
- a first electrode tab 21t protruding from the first electrode 21 may be connected to a lower end of the CID filter 43 .
- the first electrode 21 may be an anode
- the first electrode tab 21t may be a cathode tab.
- the top cap 41 may be directly or indirectly connected to the safety vent 42, the CID filter 43, and the first electrode tabs 21t to be electrically connected to the electrode assembly 20, and the electrode It can function as a terminal.
- a gasket 70 for sealing between the cap assembly 40 and the cylindrical case 30 and a CID gasket 80 surrounding an edge of the CID filter 43 may be disposed.
- FIG. 2 is a partial cross-sectional view showing the state of the cylindrical secondary battery of FIG. 1 when internal pressure increases.
- the shape of the safety vent 42 is reversed, and the CID filter 43 is separated to cut off the current. do. Specifically, the CID filter 43 is divided into a part 43a connected to the safety vent 42 and a part 43b connected to the first electrode tab 21t, and the top cap 41 functioning as an electrode terminal and Current flow between the first electrode tabs 21t is blocked.
- the notch portion of the safety vent 42 is cut off, the safety vent 42 is opened, and internal gas is discharged.
- the structural rigidity is excellent, but when the safety vent 42 is opened and internal gas is discharged, the top cap 41 removes the spatial portion. There is a disadvantage in that the safety vent 42 cannot be completely opened due to heat, so that gas discharge is limited. In addition, there may be a case in which the CID filter 43 is not clearly separated, so that current continues to flow even in an abnormal operating state.
- a lithium secondary battery performs a formation process, that is, an activation process in 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 degassing process In this activation process, 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 the degassing process.
- the conventional cylindrical secondary battery 10 needs to be sealed after electrolyte injection, it is not easy to discharge gas generated in the activation process. If the gas generated in the activation process is not discharged, it may interfere with the battery reaction between the positive electrode and the negative electrode, thereby adversely affecting the initial capacity of the battery, the formation of a stable solid electrolyte interface (SEI), and life performance development characteristics. In addition, the gas cannot be discharged, which affects the result of the safety evaluation described above.
- SEI solid electrolyte interface
- An object to be solved by the present invention is to provide a secondary battery capable of discharging gas after an activation process and a manufacturing method thereof.
- a secondary battery includes an electrode assembly; a battery case having an open top in which the electrode assembly is accommodated; and a cap assembly coupled to the open top of the battery case.
- the cap assembly may include a safety vent; and a CID filter located below the safety vent.
- the safety vent is exposed to the outside from an upper end, a vent hole passing vertically through the safety vent is formed, and a CID hole passing vertically through the CID filter and connected to the vent hole is formed.
- a first electrode tab extending from the electrode assembly is bonded to the CID filter, and the CID hole is closed or opened by the first electrode tab.
- vent hole and the CID hole may be positioned on the same vertical line, and the first electrode tab closing the CID hole may be visible from the outside through the vent hole and the CID hole.
- the vent hole may have a larger diameter than the CID hole.
- the first electrode tab may include an upper tab portion and a lower tab portion.
- the lower tab portion may be connected to the electrode assembly, and one end of the upper tab portion connected to the lower tab portion may be bonded to the CID filter.
- the CID hole may be closed or opened while the other end of the upper tab part is in close contact with or spaced apart from the lower surface of the CID filter.
- the first electrode tab may include a material having an elastic restoring force, and the other end of the upper tab portion may be elastically adhered to the lower surface of the CID filter.
- a lower end of the inner circumferential surface of the CID hole and the upper tab portion may be welded together.
- the first electrode tab may include a protrusion inserted into the CID hole.
- the secondary battery may further include a sealing ball inserted into the CID hole.
- An upper end of the battery case may be bent to form a crimping portion while covering an outer circumferential portion of the safety vent.
- a method of manufacturing a secondary battery includes accommodating an electrode assembly in a battery case with an open top; coupling a cap assembly including a safety vent and a CID filter to an open top of the battery case; an activation step of activating the electrode assembly; and a gas discharge step of discharging the gas generated in the activation step to the outside through a vent hole formed in the safety vent and a CID hole formed in the CID filter.
- the safety vent is exposed to the outside from the top.
- a first electrode tab extending from the electrode assembly is bonded to the CID filter with the CID hole closed.
- the CID hole may be opened by pressing the first electrode tab downward through the vent hole and the CID hole, and the gas may be discharged to the outside through the CID hole and the vent hole.
- a bar member or a suction device may be inserted through the vent hole and the CID hole to press the first electrode tab downward.
- the CID hole may be closed again by removing the pressing force on the first electrode tab and returning the first electrode tab to its original position.
- the manufacturing method of the secondary battery may further include a welding step of welding a lower end of the inner circumferential surface of the CID hole to the first electrode tab after the gas discharge step.
- the method of manufacturing the secondary battery may further include a sealing ball insertion step of inserting a sealing ball into the CID hole through the vent hole.
- the manufacturing method of the secondary battery may further include melting the sealing ball inserted into the CID hole.
- the safety vent can be completely opened when the internal pressure rises, thereby effectively discharging gas.
- 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 showing the state of the cylindrical secondary battery of FIG. 1 when internal pressure increases.
- 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.
- FIG. 6 is a partial view showing an enlarged portion “A” in FIG. 5 .
- FIG. 7 is a partial view showing a first electrode tab having protrusions according to a modified embodiment of the present invention.
- FIG. 8 is a partial view showing a sealing ball inserted into a CID hole according to an embodiment of the present invention.
- 9 to 15 are cross-sectional views for explaining a method of manufacturing a secondary battery according to an embodiment of the present invention.
- a part such as a layer, film, region, plate, etc.
- a part when a part is said to be “directly on” another part, it means that there is no other part in between.
- a reference part means to be located above or below the reference part, and to necessarily be located “on” or “on” in the opposite direction of gravity does not mean not.
- planar image it means when the target part is viewed from above, and when it is referred to as “cross-sectional image”, it means when a cross section of the target part cut 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.
- FIG. 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 an upper portion of a section cut along the xz plane after assembling each component of the secondary battery of FIG. 3 .
- a secondary battery 100 includes an electrode assembly 200; a battery case 300 having an open top in which the electrode assembly 200 is accommodated; and a cap assembly 400 coupled to the open top of the battery case 300 .
- the electrode assembly 200 may include a first electrode 210, a second electrode 220, and a separator 230.
- the jelly roll-type electrode assembly 200 may be formed by winding the first electrode 210 , the second electrode 220 , and the separator 230 together.
- 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 the 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. As shown in FIG. 3 , the first electrode tab 213 may protrude in the direction where the cap assembly 400 is located (the z-axis direction), and the second electrode tab 223 is the bottom of the battery case 300. It may protrude in the direction where the portion is located (-z-axis direction).
- the first electrode tab 213 may be connected to the cap assembly 400
- the second electrode tab 223 may be connected to the bottom of the battery case 300 . That is, the cap assembly 400 and the battery case 300 may each function as an electrode terminal of the secondary battery 100 .
- the battery case 300 is a structure for accommodating the electrode assembly 200 impregnated with electrolyte, and may include a metal material and may be a cylindrical case.
- the cap assembly 400 includes a safety vent 410 and a current interrupt device (CID) filter 420 located under the safety vent 410 .
- the safety vent 410 is exposed to the outside from the top.
- a vent hole 410H vertically penetrating through the safety vent 410 is formed, and a CID hole 420H penetrating vertically through the CID filter 420 and connected to the vent hole 410H is formed.
- the meaning that the vent hole 410H and the CID hole 420H are connected means that spaces inside the holes formed by each are connected to each other.
- the cap assembly 400 has a structure in which the top cap is removed, and the safety vent 410 is exposed to the outside from the top.
- This safety vent 410 is positioned on the CID filter 420 and may be electrically connected to the CID filter 420 . Specifically, a central portion of the safety vent 410 excluding the vent hole 410H and a first portion 421 of the CID filter 420 excluding the CID hole 420H, which will be described later, may be physically and electrically connected.
- a first electrode tab 213 extending from the electrode assembly 200 is bonded to the CID filter 420 . Specifically, the first electrode tab 213 protruding from the first electrode 210 may be bonded to the lower end of the CID filter 420 .
- the safety vent 410 is a thin film structure through which current passes, and may be a disk-shaped plate.
- the safety vent 410 , the CID filter 420 , and the first electrode tab 213 are sequentially connected so that the safety vent 410 may function as an electrode terminal guiding electrical connection of the electrode assembly 200 .
- the CID filter 420 is a plate member through which current passes, and outlet ports 422H for discharging gas may be formed.
- the CID filter 420 may include a first part 421 connected to the safety vent 410 and a second part 422 connected to the first electrode tab 213, and the first part 421 may be located in the center of the CID filter 420, and the second part 422 may be located in the outer circumference of the CID filter 420.
- the shape of the safety vent 410 may be reversed. According to the shape reversal of the safety vent 410, the first part 421 of the CID filter 420 is raised together, and the first part 421 and the second part 422 of the CID filter 420 are separated from each other. It can be. In order to induce such a separation according to an increase in internal pressure, the first portion 421 and the second portion 422 may be designed to have somewhat weak strength. Current between the safety vent 410 and the first electrode tab 213 is blocked 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 cut or torn to open the safety vent 410, and internal gas is discharged.
- the conventional cylindrical secondary battery (10, see FIG. 1)
- the top cap 41 since the top cap 41 is located on the safety vent 42, the safety vent 42 cannot be completely opened due to inferior space. As a result, the gas cannot be effectively discharged. Also, the top cap 41 itself may interfere with gas discharge.
- the safety vent 410 since the safety vent 410 is exposed to the outside from the top without a top cap, the safety vent 410 can be freely reversed in shape or separated when the internal pressure rises without hindrance. have. Therefore, compared to the conventional cylindrical secondary battery 10, gas discharge is more effective, and current interruption by separation of the first part 421 and the second part 422 can be made more reliably in an abnormal operating state.
- vent hole 410H structures of the vent hole 410H, the CID hole 420H, and the first electrode tab 213 according to the present embodiment will be described in detail.
- FIG. 6 is a partial view showing an enlarged portion “A” in FIG. 5 .
- the first electrode tab 213 extending from the electrode assembly 200 is bonded to the CID filter 420 .
- the CID hole 420H is closed or opened by the first electrode tab 213 .
- vent hole 410H and the CID hole 420H are connected.
- the safety vent 410 and the CID filter 420 are coupled, and the vent hole 410H and the CID hole 420H may be connected to each other at a portion where the safety vent 410 and the CID filter 420 are coupled.
- the CID hole 420H may be formed in the first portion 421 of the CID filter 420 connected to the safety vent 410 .
- the CID hole 420H is closed, and when the first electrode tab 213 is spaced apart from the CID filter 420, the CID hole 420H is closed. (420H) is open.
- a long rod is passed through the vent hole 410H of the safety vent 410 and the CID hole 420H of the CID filter 420, and then the first electrode tab 213 closing the CID hole 420H is removed. You can press in the downward direction. Accordingly, while the CID hole 420H is opened, gas generated in an activation process described later may be discharged to the outside through the CID hole 420H and the vent hole 410H. Therefore, it is possible to solve problems such as expansion and deformation of the electrode assembly due to residual gas or lithium precipitation due to residual gas bubbles.
- the secondary battery 100 since the secondary battery 100 according to the present embodiment has a structure in which the top cap is removed, it is easy to pass a long rod through the vent hole 410H and the CID hole 420H. In other words, the first electrode tab 213 may be pressed by inserting a bar without damaging the vent hole 410H and the CID hole 420H.
- the CID hole 420H is closed by the first electrode tab 213, it can stably charge and discharge during the activation process.
- the internal gas may be discharged to the outside through the opened CID hole 420H by pressing the first electrode tab 213 downward.
- gas discharge is completed, leakage of the electrolyte solution is prevented by welding the first electrode tab 213 and the CID hole 420H to be sealed.
- the vent hole 410H and the CID hole 420H may have a minimum diameter into which a rod can be inserted.
- the vent hole 410H and the CID hole 420H may have a diameter of 1 to 3 mm, and thus discharge gas inside the battery case 300 to the outside, while the vent hole 410H and the CID hole Inflow of foreign substances through (420H) can be prevented.
- vent hole 410H and the CID hole 420H may be located on the same vertical line.
- the vent hole 410H and the CID hole 420H may be arranged in a vertical direction and positioned on the same vertical line. Accordingly, the first electrode tab 213 blocking the CID hole 420H can be seen from the outside through the vent hole 410H and the CID hole 420H. As a result, it is possible to easily check whether the CID hole 420H is closed from the outside of the secondary battery 100 . Furthermore, since the secondary battery 100 according to the present embodiment has a top cap removed, it is possible to more easily check whether the CID hole 420H is closed.
- the vent hole 410H and the CID hole 420H may be opened by pressing the first electrode tab 213 more effectively.
- the vent hole 410H is formed at the center point of the safety vent 410 and the CID hole 420H is formed at the center point of the CID filter 420, thereby minimizing strength weakening.
- only a portion of the vent hole 410H and the CID hole 420H may be positioned on the same vertical line.
- only half of the vent hole 410H and the CID hole 420H may be positioned on the same vertical line, and the other half may be positioned on different vertical lines. Accordingly, it is possible to prevent unnecessary objects or foreign substances from flowing into the vent hole 410H and the CID hole 420H, and also to prevent the first electrode tab 213 from being pressed by unnecessary objects.
- the diameter d1 of the vent hole 410H may be greater than the diameter d2 of the CID hole 420H.
- the vent hole 410H has a larger diameter than the CID hole 420H, so that the rod can easily pass therethrough.
- the vent hole 410H may have a larger diameter than the CID hole 420H.
- the diameter of the vent hole 410H may be 3 mm, and the diameter of the CID hole 420H may be 2 mm.
- the safety vent 410 and the CID filter 420 are combined, and the vent hole 410H and the CID hole 420H are connected to each other at the part where the safety vent 410 and the CID filter 420 are combined.
- the outer circumferential surface of the vent hole 410H and the outer circumferential surface of the CID hole 420H may be bonded to each other.
- the joint portion W may be formed by welding a lower outer circumferential surface of the vent hole 410H and an upper outer circumferential surface of the CID hole 420H.
- the safety vent 410 and the CID filter 420 are sealed and bonded, and foreign substances flow into the vent hole 410H and the CID hole 420H through the gap between the safety vent 410 and the CID filter 420. Electrolyte leakage can be prevented.
- the first electrode tab 213 may include an upper tab portion 213a and a lower tab portion 213b.
- the lower tab portion 213b may be connected to the electrode assembly 200 . That is, the lower tab portion 213b may be a portion extending from the electrode assembly 200 .
- One end of the upper tab portion 213a connected to the lower tab portion 213b may be bonded to the CID filter 420 .
- the one end of the upper tab portion 213a may be welded to the lower surface of the CID filter 420 to form a joint portion W.
- the other end of the upper tab portion 213a may close or open the CID hole 420H while being in close contact with or spaced apart from the lower surface of the CID filter 420 .
- the upper tab portion 213a closing the CID hole 420H is pressed with a rod, which will be described later, the other end of the upper tab portion 213a is separated from the CID filter 420 and the CID hole 420H is opened.
- the force pressing the other end of the upper tap part 213a is removed, the other end of the upper tap part 213a comes into close contact with the CID filter 420 again due to the elastic restoring force of the upper tap part 213a, thereby closing the CID hole 420H.
- the first electrode tab 213 can stably seal the CID hole 420H during the activation process of the secondary battery 100, and after the activation process, the first electrode tab 213 is spaced apart from the CID filter 420 to form the CID hole 420H. can be opened and the gas can be released.
- the first electrode tab 213 may include a material having elastic restoring force, and the other end of the upper tab portion 213a may be elastically adhered to the lower surface of the CID filter 420 .
- the first electrode tab 213 may be an alloy steel containing a material having elastic restoring force.
- the lower end of the inner circumferential surface of the CID hole 420H and the upper tab portion 213a of the first electrode tab 213 may be welded. That is, the other end of the upper tab portion 213a, which is in close contact with the lower surface of the CID filter 420, is bonded to the CID filter 420 after gas is discharged, and thus the CID hole 420H is completely sealed. As a result, it is possible to prevent inflow of foreign substances or leakage of electrolyte after gas is discharged.
- FIG. 7 is a partial view showing a first electrode tab having protrusions according to a modified embodiment of the present invention.
- the first electrode tab 213 may include a protrusion 213a-1 inserted into the CID hole 420H.
- the first electrode tab 213 may include an upper tab portion 213a and a lower tab portion 213b, and the protrusion 213a-1 protrudes from the upper tab portion 213a. can be formed
- the protrusion 213a - 1 is for increasing sealing force between the first electrode tab 213 and the CID hole 420H, and may have the same diameter as the diameter of the CID hole 420H. As the protrusion 213a-1 is inserted into the CID hole 420H, sealing force between the first electrode tab 213 and the CID hole 420H is increased.
- the protrusion 213a-1 is formed in a hemispherical raised structure, and accordingly, the protrusion 213a-1 can be easily coupled to or separated from the CID hole 420H.
- FIG. 8 is a partial view showing a sealing ball inserted into a CID hole according to an embodiment of the present invention.
- the secondary battery 100 may further include a sealing ball 500 inserted into the CID hole 420H.
- the sealing ball 500 When gas generated after the activation process is completely discharged, the sealing ball 500 may be inserted into the CID hole 420H.
- the sealing ball 500 is for sealing the CID hole 420H, has a cylindrical shape or a spherical shape, and seals the CID hole 420H while being inserted into the CID hole 420H through the vent hole 410H.
- the cylindrical or spherical sealing ball 500 may be bonded to the CID hole 420H by ball welding.
- the ball welding refers to a bonding method in which a ball-shaped structure is fired into a hole having a smaller diameter than the ball and the hole is blocked. That is, the diameter of the sealing ball 500 before filling the CID hole 420H may be larger than the inner diameter of the CID hole 420H.
- the sealing ball 500 after the sealing ball 500 is inserted into the CID hole 420H, it may be melted through a thermal fusion device (not shown). Accordingly, the sealing force between the CID hole 420H and the sealing ball 500 can be increased while the sealing ball 500 is bonded to the inner circumferential surface of the CID hole 420H.
- the safety vent 410 since the safety vent 410 according to the present embodiment has a structure that is exposed to the outside when the top cap is removed, it is easy to seal the CID hole 420H.
- the conventional cylindrical secondary battery (10, see FIG. 1)
- the top cap 41 Even if the CID hole is formed, it is structurally very difficult to close the CID hole again after gas is discharged because the top cap 41 is present. Holes must be formed in both the top cap 41 and the safety vent 42 for gas discharge. Due to the existence of the top cap 41, it is structurally necessary to block the holes formed in the safety vent 42 and the CID filter 43. is bound to be complex and difficult.
- the cap assembly 400 according to the present embodiment has a structure in which the safety vent 410 is exposed at the top, after gas is discharged, as described above, there is a gap between the bottom of the inner circumference of the CID hole 420H and the upper tab 213a. It is easy to seal the CID hole 420H by welding or inserting the sealing ball 500.
- the battery case 300 may include a crimping portion 300C and a beading portion 300B.
- the beading portion 300B refers to a portion in which a portion of the cylindrical battery case 300 is recessed toward the center of the electrode assembly 200, and is intended to prevent the electrode assembly 200 from moving.
- the crimping portion 300C refers to a portion located above the beading portion 300B and 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 and form a crimping portion 300C. More specifically, an upper end of the battery case 300 may be bent to surround the outer circumferential 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 portion 300C and the beading portion 300B to increase sealing force between the cap assembly 400 and the battery case 300 . Also, the gasket 700 may block electrical connection between the cap assembly 400 and the battery case 300 .
- a crimping portion 300C may be formed by placing a gasket 700 between the battery case 300 and the cap assembly 400, and performing crimping by bending an upper end of the battery case 300. . That is, mounting of the cap assembly 400 , sealing of the secondary battery 100 , and insulation between the battery case 300 and the cap assembly 400 may be performed by crimping. This gasket 700 may be located 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. Since the bent portion 410B is formed, deformation transmitted to the safety vent 410 during crimping may be reduced. In addition, as described above, according to the shape reversal of the safety vent 410 in an abnormal operating state, the first part 421 of the CID filter 420 is lifted together, so that the first part 421 of the CID filter 420 ) and the second part 422 are separated from each other. As a result, the flow of current is blocked.
- the bent portion 410B bent upward may be formed.
- the cap assembly 400 may be damaged.
- the safety vent 410 may be 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 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 properly implemented when the internal pressure rises.
- the thickness of the safety vent 410 is not simply increased, but a curling part 410C is provided at a portion corresponding to the crimping part 300C of the safety vent 410.
- the safety vent 410 may include a curling part 410C bent at an outer circumference of the safety vent 410 .
- FIGS. 3 and 4 show the flange part 410F before the curling part 410C is formed, and in FIG. 5, the flange part 410F is bent inward to curl the curling part ( 410 C) was formed.
- the crimping portion 300C of the battery case 300 may wrap the safety vent 410 with the gasket 700 interposed therebetween.
- the crimping portion 410C of the safety vent 410 is wrapped around and crimping is performed.
- the central portion of the safety vent 410 is made of one layer, but the outer peripheral portion of the safety vent 410 wrapped by the crimping portion 300C may be made of two layers. That is, by providing the curling part 410C, it is intended to prevent damage to the safety vent 410 that may occur during crimping and at the same time not interfere with the shape reversal or separation of the safety vent 410 when the internal pressure rises. .
- 9 to 15 are cross-sectional views for explaining a method of manufacturing a secondary battery according to an embodiment of the present invention. Specifically, all of them showed a cross section of the upper part of the secondary battery.
- a method of manufacturing a secondary battery includes accommodating an electrode assembly 200 in a battery case 300 with an open top and a battery A step of coupling the cap assembly 400 including the safety vent 410 and the CID filter 420 to the open top of the case 300 is included.
- the electrode assembly 200 may have a jelly roll shape 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 solution together with the electrode assembly 200 may be injected into the battery case 300 before the cap assembly 400 is coupled.
- the safety vent 410 of the cap assembly 400 is exposed to the outside from the top, a vent hole 410H is formed in the safety vent 410, and a CID hole 420H is formed in the CID filter 420. Since the detailed structures of the safety vent 410 and the CID filter 420 have been described above, they will be omitted.
- the CID filter 420 is placed in a state in which the first electrode tab 213 extending from the electrode assembly 200 closes the CID hole 420H. is bonded to the underside of At this time, as described above, the first electrode tab 213 may include an upper tab portion 213a and a lower tab portion 213b.
- the upper tab portion 213a is brought into close contact with the lower surface of the CID filter 420, and then the other end of the upper tab portion 213a is moved to close the CID hole 420H.
- one end of the upper tab portion 213a is welded to the lower surface of the CID filter 420 .
- the other end of the upper tap part 213a closes the CID hole 420H while being in close contact with the lower surface of the CID filter 420 including the CID hole 420H, and one end of the upper tap part 213a is attached to the CID filter 420.
- the CID filter 420 and the first electrode tab 213 are connected.
- the first electrode tab 213 has elasticity in the direction of the CID hole 420H, and thus the CID hole 420H can be maintained in a closed state.
- the protrusion 213a-1 when the protrusion 213a-1 is formed on the upper tab 213a of the first electrode tab 213, connecting the CID filter 420 and the first electrode tab 213 In the process, the protrusion 213a-1 may be inserted into the CID hole 420H.
- the combining of the cap assembly 400 is a step of forming a crimping portion 300C surrounding the safety vent 410 by bending the upper end 300U of the battery case 300.
- the gasket 700 is placed between the safety vent 410 of the cap assembly 400 and the battery case 300, and the upper end 300U of the battery case 300 is bent to perform crimping.
- the safety vent 410 may include a curling portion 410C bent at the outer circumferential portion of the safety vent 410, and crimping may be performed such that the crimping portion 300C surrounds the curling portion 410C. have.
- This curling portion 410C may be formed by inwardly bending the upward flange portion 410F (see FIG. 4 ).
- the method of manufacturing a secondary battery according to the present embodiment includes an activation step of activating the electrode assembly 200 .
- the activation step may be performed by repeating charging and discharging with a constant current or 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 negative electrode and low voltage screening.
- Charging and discharging may be repeated by applying a constant current or voltage to the safety vent 410 and the battery case 300, which function as electrode terminals.
- a gas is generated inside the battery case 300 due to a mutual reaction between the electrode assembly and the electrolyte, and the gas increases pressure while accumulating inside the battery case 300 .
- the gas generated in the activation step is passed through a vent hole 410H formed in the safety vent 410 and a CID hole 420H formed in the CID filter 420. and a gas discharge step of discharging to the outside through.
- the first electrode tab 213 is pressed downward through the vent hole 410H and the CID hole 420H to open the CID hole 420H, and the gas is released into the CID hole 420H.
- the vent hole 410H through which it is discharged to the outside.
- the upper tab portion 213a is pressed.
- the first electrode tab 213 in the gas discharge step, the first electrode tab 213 may be pressed downward by inserting the rod member 1000 through the vent hole 410H and the CID hole 420H. Similarly, the bar member 1000 may press the upper tab portion 213a of the first electrode tab 213 downward. Then, as the CID hole 420H is opened, the gas generated inside the battery case 300 is discharged to the outside through the CID hole 420H and the vent hole 410H.
- the secondary battery 100 since the secondary battery 100 according to the present embodiment has a structure in which the top cap is removed, it is easy to pass the rod member 1000 through the vent hole 410H and the CID hole 420H. In other words, the first electrode tab 213 may be pressed by inserting a bar without damaging the vent hole 410H and the CID hole 420H. In addition, since the top cap is removed, gas can be discharged more smoothly.
- a method of manufacturing a secondary battery according to a modified embodiment of the present invention may include a gas discharge step using a suction device 1100 .
- a separate suction device 1100 not the rod member 1000 in FIG. 11 , is inserted through the vent hole 410H and the CID hole 420H to form the upper tab portion 213a of the first electrode tab 213. can be pressed in the downward direction.
- the suction device 1100 may suck gas inside the battery case 300 .
- the gas inside the battery case 300 can be removed more effectively.
- the CID hole 420H may be closed again by removing the force pressing the first electrode tab 213 and returning the first electrode tab 213 to its original position. Removing the force pressing the first electrode tab 213 means removing the rod member 1000 or the suction device 1100 .
- gas discharge is finished.
- the manufacturing method of the secondary battery according to the present embodiment may further include a welding step of welding the lower end of the inner circumferential surface of the CID hole 420H to the first electrode tab 213 after the gas discharge step.
- a separate welding device (not shown) is inserted through the vent hole 410H and the CID hole 420H to weld the lower end of the inner circumferential surface of the CID hole 420H to the first electrode tab 213.
- FIG. 13 it is expressed that a joint portion W is formed at the corresponding portion by welding.
- the upper tab portion 213a is in close contact with the CID hole 420H, the upper tab portion 213a and the inner circumferential surface of the CID hole 420H are welded to seal between the CID filter 420 and the first electrode tab 213. .
- the CID hole 420H may be primarily sealed after the gas discharge step.
- the manufacturing method of the secondary battery according to the present embodiment may further include a sealing ball insertion step of inserting the sealing ball 500 into the CID hole 420H through the vent hole 410H.
- the sealing ball 500 may be inserted into the CID hole 420H in an interference fitting manner. Accordingly, the CID hole 420H may be effectively sealed.
- the sealing ball 500 may be bonded to the CID hole 420H by ball welding.
- the CID hole 420H may be a circular through-hole, and the sealing ball 500 may have a cylindrical or spherical shape.
- the sealing ball 500 is strongly launched into the CID hole 420H, and the sealing ball 500 may be inserted into the CID hole 420H.
- the manufacturing method of the secondary battery according to the present embodiment may further include melting the sealing ball 500 inserted into the CID hole 420H.
- the melting device 1200 may be inserted through the vent hole 410H, and then heat may be applied to the sealing ball 500. Accordingly, the partially melted sealed ball 500 is bonded to the inner circumferential surface of the CID hole 420H. Then, the CID hole 420H can be completely sealed.
- the activation step a large amount of gas is generated due to the formation of an electrode film or the decomposition of moisture inside the cell. Since the gas generated in the activation step is large and continuously reacts with the electrode film, a process for discharging it is required. As described above, the secondary battery 100 manufactured according to an embodiment of the present invention is finally sealed after discharging the gas generated in the activation step, so that problems such as expansion and deformation of the electrode assembly due to residual gas or residual gas bubbles It is possible to solve the problem of lithium precipitation caused by
- 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 can be applied to means of transportation such as electric bicycles, electric vehicles, hybrids, or energy storage systems (ESS), but is not limited thereto and can be applied to various devices that can use secondary batteries.
- means of transportation such as electric bicycles, electric vehicles, hybrids, or energy storage systems (ESS), but is not limited thereto and can be applied to various devices that can use secondary batteries.
- ESS energy storage systems
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
Claims (16)
- 전극 조립체;상기 전극 조립체가 수납되고, 상부가 개방된 전지 케이스; 및상기 전지 케이스의 개방된 상부에 결합되는 캡 조립체를 포함하고,상기 캡 조립체는, 안전 벤트; 및 상기 안전 벤트 아래에 위치한 CID 필터를 포함하고,상기 안전 벤트는, 상단에서 외부로 노출되며,상기 안전 벤트에 상하로 관통된 벤트홀이 형성되고,상기 CID 필터에, 상하로 관통되고 상기 벤트홀과 연결되는 CID 홀이 형성되며,상기 전극 조립체로부터 연장된 제1 전극탭이 상기 CID 필터에 접합되며,상기 CID 홀은 상기 제1 전극탭에 의해 폐쇄되거나 개방되는 이차 전지.
- 제1항에서,상기 벤트홀 및 상기 CID 홀은 동일한 수직선 상에 위치하고,상기 CID 홀을 폐쇄한 상기 제1 전극탭이 상기 벤트홀 및 상기 CID 홀을 통해 외부에서 보여지는 이차 전지.
- 제1항에서,상기 벤트홀은, 상기 CID 홀보다 큰 직경을 가지는 이차 전지.
- 제1항에서,상기 제1 전극탭은, 상측탭부 및 하측탭부를 포함하고,상기 하측탭부는 상기 전극 조립체에 연결되며,상기 하측탭부와 연결된 상기 상측탭부의 일단이 상기 CID 필터에 접합되는 이차 전지.
- 제4항에서,상기 상측탭부의 타단이 상기 CID 필터의 하면에 밀착되거나 이격되면서, 상기 CID 홀을 폐쇄하거나 개방하는 이차 전지.
- 제5항에서,상기 제1 전극탭은, 탄성 복원력을 가진 소재를 포함하고,상기 상측탭부의 상기 타단이 상기 CID 필터의 하면에 탄력적으로 밀착되는 이차 전지.
- 제4항에서,상기 CID 홀의 내주면 하단과 상기 상측탭부가 용접 접합되는 이차 전지.
- 제1항에서,상기 제1 전극탭은, 상기 CID 홀에 삽입되는 돌기부를 포함하는 이차 전지.
- 제1항에서,상기 CID 홀에 삽입된 밀폐볼을 더 포함하는 이차 전지.
- 제1항에서,상기 전지 케이스의 상부 일단이 구부러져 상기 안전 벤트의 외주 부분을 감싸며 크림핑부를 형성하는 이차 전지.
- 전극 조립체를 상부가 개방된 전지 케이스에 수납하는 단계;상기 전지 케이스의 개방된 상부에, 안전 벤트 및 CID 필터를 포함하는 캡 조립체를 결합하는 단계;상기 전극 조립체를 활성화하는 활성화 단계; 및상기 활성화 단계에서 발생한 가스를 상기 안전 벤트에 형성된 벤트홀과 상기 CID 필터에 형성된 CID 홀을 통해 외부로 배출하는 가스 배출 단계를 포함하고,상기 안전 벤트는, 상단에서 외부로 노출되며,상기 전극 조립체로부터 연장된 제1 전극탭이 상기 CID 홀을 닫은 상태로 상기 CID 필터에 접합되고,상기 가스 배출 단계에서, 상기 벤트홀과 상기 CID 홀을 통해 상기 제1 전극탭을 하부 방향으로 눌러 상기 CID 홀을 개방시키고, 상기 가스가 상기 CID 홀과 상기 벤트홀을 통해 외부로 배출되는 이차 전지의 제조 방법.
- 제11항에서,상기 가스 배출 단계에서,막대부재나 흡입 장치를 상기 벤트홀과 상기 CID 홀을 통해 삽입하여, 상기 제1 전극탭을 하부 방향으로 누르는 이차 전지의 제조 방법.
- 제11항에서,상기 가스 배출 단계 이후, 상기 제1 전극탭을 누르는 힘을 제거하고, 상기 제1 전극탭을 원위치로 복귀시켜 상기 CID 홀을 다시 폐쇄하는 이차 전지의 제조 방법.
- 제11항에서,상기 가스 배출 단계 이후, 상기 CID 홀의 내주면 하단을 상기 제1 전극탭과 용접하는 용접 단계를 더 포함하는 이차 전지의 제조 방법.
- 제11항에서,상기 벤트홀을 통해 상기 CID 홀에 밀폐볼을 삽입하는 밀폐볼 삽입 단계를 더 포함하는 이차 전지의 제조 방법.
- 제15항에서,상기 CID 홀에 삽입된 상기 밀폐볼을 용융하는 단계를 더 포함하는 이차 전지의 제조 방법.
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KR20190093360A (ko) * | 2018-02-01 | 2019-08-09 | 주식회사 엘지화학 | 리벳을 포함하는 캡 어셈블리 및 이를 포함하는 비딩부/클림핑부가 생략된 원통형 전지 |
KR20210072370A (ko) | 2019-12-09 | 2021-06-17 | 이장면 | 고데기 거치대 |
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- 2022-05-09 CN CN202280007657.3A patent/CN116547860A/zh active Pending
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EP3223333A1 (en) * | 2016-03-22 | 2017-09-27 | Samsung SDI Co., Ltd | Rechargeable battery |
KR20190011515A (ko) * | 2017-07-25 | 2019-02-07 | 주식회사 엘지화학 | 이차전지 |
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KR20190093360A (ko) * | 2018-02-01 | 2019-08-09 | 주식회사 엘지화학 | 리벳을 포함하는 캡 어셈블리 및 이를 포함하는 비딩부/클림핑부가 생략된 원통형 전지 |
KR20210072370A (ko) | 2019-12-09 | 2021-06-17 | 이장면 | 고데기 거치대 |
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