WO2022014888A1 - 안전성이 향상된 파우치형 이차전지 및 이를 포함하는 배터리 모듈 - Google Patents
안전성이 향상된 파우치형 이차전지 및 이를 포함하는 배터리 모듈 Download PDFInfo
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- WO2022014888A1 WO2022014888A1 PCT/KR2021/007778 KR2021007778W WO2022014888A1 WO 2022014888 A1 WO2022014888 A1 WO 2022014888A1 KR 2021007778 W KR2021007778 W KR 2021007778W WO 2022014888 A1 WO2022014888 A1 WO 2022014888A1
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- Prior art keywords
- pouch
- type secondary
- secondary battery
- gas pocket
- electrode lead
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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
- H01M50/105—Pouches or flexible bags
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
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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
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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
-
- 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
- H01M50/317—Re-sealable arrangements
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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
- H01M50/394—Gas-pervious parts or elements
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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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
- H01M50/512—Connection only in parallel
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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
- H01M50/543—Terminals
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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
- H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
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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
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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
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
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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
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/20—Pressure-sensitive devices
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
Definitions
- the present invention relates to a pouch-type secondary battery with improved safety and a battery module including the same.
- the present invention relates to a pouch-type secondary battery including a risk sensing device including a gas pocket disposed on an electrode lead and a current sensing unit moving according to the expansion of the gas pocket, and a battery module including the same.
- a pouch-type secondary battery is generally formed by forming an aluminum laminate sheet to form an accommodating part, and then accommodating an electrode assembly including a positive electrode, a separator, and a negative electrode in the accommodating part.
- the aluminum laminate sheet is easily deformable and can be manufactured in various shapes to form a pouch-type secondary battery suitable for various electronic devices.
- the aluminum laminate sheet is lightweight unlike the conventional cylindrical secondary battery or prismatic secondary battery, there is an advantage in that the energy density per weight of the pouch-type secondary battery can be improved.
- pouch-type secondary batteries when internal gas is generated during charging and discharging, the battery may generate heat and explode due to malfunction of the battery. can occur In particular, there is a risk of explosion because the gas generated during an internal short circuit cannot be discharged.
- FIG. 1 is a perspective view of a pouch-type secondary battery having a gas pocket.
- a pouch-type secondary battery having a gas pocket includes an electrode assembly 10 as shown in FIG. 1 ; It may include a case 20 having an accommodating part 21 accommodating the electrode assembly 10 and a gas pocket 22 accommodating gas generated in the accommodating part 21 .
- the pouch-type secondary battery having the gas pocket 22 has a separate space for accommodating gas. can prevent
- the gas pocket 22 increases the overall volume of the pouch-type secondary battery, it cannot be notified in advance before the function stop or damage of the pouch-type secondary battery occurs.
- FIG. 2 is a perspective view of a pouch-type secondary battery having a gas release inducing unit.
- the pouch-type secondary battery having a gas release inducing part includes an electrode assembly 10 and a case 20 having an accommodating part 21 for accommodating the electrode assembly 10, similar to the pouch-type secondary battery of FIG. 1 .
- a gas release guide part 23 for inducing gas release is included on the adjacent surface of the housing part of the case 20 .
- the gas release inducing part 23 is connected to the accommodating part 21 and a part of the sealing part sealing the periphery of the accommodating part 21 is sealed with a weak sealing force, or a part of the sealing part is not sealed in the form shown in FIG. 2 . may be in the form
- Patent Document 1 for the purpose of providing a battery module including a probe for detecting the expansion of a battery cell, there is a sensing probe that detects a change in the local volume expansion of a battery cell and transmits a signal. There is a problem in that measurement errors may occur depending on the expansion part.
- Patent Document 1 Korean Patent Publication No. 10-2017-0040919
- An object of the present invention is to solve the above problems, and it is an object of the present invention to measure the amount of gas inside the housing unit before the pouch-type secondary battery is broken.
- a pouch-type secondary battery includes an electrode assembly from which an electrode lead protrudes, a case including a housing for accommodating the electrode assembly, and a gas pocket disposed on the electrode lead and a danger sensing device including a current sensing unit moving according to the expansion of the gas pocket.
- the current sensing unit may include an electrode lead contacting unit in contact with the electrode lead and a gas pocket contacting unit in contact with the gas pocket and moving the current sensing unit using a force of the gas pocket to expand.
- the electrode lead contact portion may have a greater distance from the electrode lead due to the expansion of the gas pocket.
- the gas pocket contact portion may contact the gas pocket in a direction in which the gas pocket expands.
- the gas pocket contact portion may have a larger cross-sectional area than the electrode lead contact portion.
- At least the electrode lead contact portion of the current sensing unit may be a conductor.
- At least the outer surface of the gas pocket contact portion of the current sensing unit may be made of an insulating material.
- the insulating material may be a material having an adhesive force.
- One side of the current sensing unit may be connected to a voltage measuring device.
- a portion in which the gas pocket and the receiving part are connected may be sealed weakly than the sealing part.
- the gas pocket may expand when the internal pressure of the accommodating part is greater than or equal to a preset range.
- one surface of the gas pocket may be in contact with the electrode lead, and the other surface may be in contact with the current sensing unit.
- One gas pocket may exist on both sides of the current sensing unit.
- the gas pocket may exist on a terrace portion formed by a sealing portion of a portion from which the electrode lead protrudes, or may be disposed on at least the electrode lead.
- the present invention may be a battery module including any one of the pouch-type secondary batteries described above.
- the pouch-type secondary batteries may be connected in parallel.
- the present invention may be a battery pack including the above-mentioned pouch-type secondary battery. It may also be a device in which the pouch-type secondary battery is mounted.
- one or two or more components that do not conflict among the above components may be selected and combined.
- the pouch-type secondary battery according to the present invention improves the safety of the battery by preventing in advance whether or not gas is generated inside the housing and the function stop or rupture of the pouch-type secondary battery due to the generated gas. .
- FIG. 1 is a perspective view of a pouch-type secondary battery having a gas pocket.
- FIG. 2 is a perspective view of a pouch-type secondary battery having a gas release inducing unit.
- FIG 3 is a perspective view of a pouch-type secondary battery according to a first embodiment of the present invention.
- FIG. 4 is a plan view of a pouch-type secondary battery according to a first embodiment of the present invention.
- FIG. 5 is a side cross-sectional view of a pouch-type secondary battery according to a first embodiment of the present invention.
- FIG. 6 is a perspective view of a pouch-type secondary battery according to a second embodiment of the present invention.
- FIG. 7 is a plan view of a pouch-type secondary battery according to a second embodiment of the present invention.
- FIG. 8 is a plan view of a pouch-type secondary battery according to a third embodiment of the present invention.
- FIG. 9 is a side cross-sectional view of a pouch-type secondary battery according to the present invention.
- FIG. 10 is a schematic diagram of a method for manufacturing a pouch-type secondary battery according to the present invention.
- FIG. 3 is a perspective view of a pouch-type secondary battery according to a first embodiment of the present invention
- FIG. 4 is a plan view of a pouch-type secondary battery according to the first embodiment of the present invention
- FIG. 5 is a first embodiment of the present invention It is a side cross-sectional view of a pouch-type secondary battery according to
- the electrode assembly 100 in which the electrode lead 110 protrudes and a housing unit accommodating the electrode assembly 100 ( Danger detection including a case 200 including a case 210, a gas pocket 310 disposed on the electrode lead 110, and a current sensing unit 320 moving according to the expansion of the gas pocket 310 device 300 .
- the electrode assembly 100 is a jelly-roll-type assembly having a structure in which a separator is interposed between a long sheet-shaped positive electrode and a negative electrode and then wound up, or a unit of a structure in which a rectangular positive electrode and a negative electrode are stacked with a separator interposed therebetween.
- a stacked assembly consisting of cells, a stack-folding assembly in which unit cells are wound by a long separation film, or a lamination-stacking assembly in which unit cells are stacked with a separator interposed therebetween and attached to each other, etc. can be done, but is not limited thereto.
- the electrode lead 110 may have a structure in which the positive electrode tab and the negative electrode tab of the electrode assembly 100 are electrically connected to each other and then exposed to the outside of the case, and the electrode lead 110 is directly connected without the positive electrode tab and the negative electrode tab. It may have a structure connecting the outside of the electrode assembly 100 and the case 200, but is not limited thereto. Since the pouch-type secondary battery as described above corresponds to generally known configurations, a detailed description thereof will be omitted.
- the case 200 typically has a laminate sheet structure of an inner layer/metal layer/outer layer. Since the inner layer is in direct contact with the electrode assembly, it must have insulation and electrolyte resistance, and for sealing with the outside, the sealing property, that is, the sealing portion where the inner layers are thermally bonded to each other must have excellent thermal bonding strength.
- the material of the inner layer may be selected from polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, polybutylene, etc., polyurethane resins and polyimide resins having excellent chemical resistance and good sealing properties, but is not limited thereto, Polypropylene excellent in mechanical properties such as tensile strength, rigidity, surface hardness, and impact resistance and chemical resistance is the most preferable.
- the metal layer in contact with the inner layer corresponds to a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside.
- an outer layer is provided on the other side of the metal layer, and this outer layer can be made of a heat-resistant polymer with excellent tensile strength, moisture permeability and air permeability prevention so as to secure heat resistance and chemical resistance while protecting the electrode assembly.
- a heat-resistant polymer with excellent tensile strength, moisture permeability and air permeability prevention so as to secure heat resistance and chemical resistance while protecting the electrode assembly.
- nylon or polyethylene terephthalate may be used, but is not limited thereto.
- the accommodating part 210 may be formed in both the upper and lower portions of the case 200 , or may exist only in either one of the upper and lower portions.
- the case 200 seals the outer surface of the accommodating part 210 to prevent substances in the accommodating part 210 from being discharged to the outside.
- the sealing portion 220 formed by sealing is bent in the direction of the receiving portion 210 to improve the energy density of the battery module.
- the terrace portion from which the electrode lead 110 protrudes in one direction or in both directions among the sealing portion 220 protrudes from the receiving portion 210 .
- the risk sensing device 300 may be located in the terrace portion of the sealing portion 220 or the electrode lead 110 adjacent to the terrace portion. That is, the risk sensing device 300 may be positioned from the terrace portion on the electrode lead, and may be present in a portion of the terrace portion or positioned on the electrode lead.
- the gas pocket 310 of the risk sensing device 300 may be connected to the receiving part 310 and the sealing part 220 . That is, the gas pocket 310 may be connected to the accommodating part 310 by a sealing force weaker than that of the sealing part 220 .
- the gas pocket 310 when the internal pressure of the accommodating part 210 is greater than or equal to a set range, the part connected to the accommodating part 210 by a weak sealing force is damaged, and gas moves inside the gas pocket 310. It may be in an expandable form. In this case, the gas pocket 310 may be of a form in which one expansion occurs, or may be divided into several zones and expand two or more times.
- the gas pocket 310 may be present on the sealing portion 220 of the portion where the electrode lead 110 protrudes, that is, the terrace portion, or may be disposed on the electrode lead 110 at least.
- the gas pocket 310 may be a part of the sealing part 220 .
- the gas pocket 310 may be a part of the sealing part 220 formed in a portion where the electrode lead 110 protruding from the electrode assembly 100 passes through the case 200 as shown in FIGS. 3 and 5 . .
- the gas pocket 310 according to the first embodiment is located at the outer third of the sealing part 220 , that is, when the sealing part 220 is divided into three equal parts, the furthest part of the accommodating part 210 is can be located on the side.
- the gas pocket 310 may be connected to the case 200 and made of the same material as that used for the case 200 .
- One side of the gas pocket 310 may be laminated like the electrode tab for sealing force, and the other side may be in contact with the current sensing unit 320 .
- At least one gas pocket 310 may exist in one pouch-type secondary battery.
- the gas pocket 310 may help the movement of the current sensing unit 320 on both sides of the current sensing unit 320 to facilitate the operation of the current sensing unit 320 . .
- the pouch-type secondary battery according to the present invention has a gas accommodating part capable of accommodating a certain gas in addition to the gas pocket 310 to prevent breakage of the pouch-type secondary battery, and when it exceeds a certain range, the gas pocket ( 310) to inform the danger. Also, on the contrary, after the gas pocket 310 is operated by the one-way valve of the gas accommodating part, the gas generated inside the pouch-type secondary battery may be accommodated in the gas accommodating part.
- FIG. 6 is a perspective view of a pouch-type secondary battery according to a second embodiment of the present invention
- FIG. 7 is a plan view of a pouch-type secondary battery according to a second embodiment of the present invention.
- the gas pocket 310 may be formed separately from the sealing unit 220 .
- the gas pocket 310 is disposed adjacent to the sealing part 220 sealing the electrode lead 110 , that is, the gas pocket 310 is disposed on the electrode lead 110 while securing the sealing force of the electrode lead 110 . ) is located within reach.
- the sealing force of the connection sealing part 221 connected to the gas pocket 310 is weaker than that of other parts, and when gas is generated inside the accommodation part 210 , the connection sealing part 221 is destroyed first. The gas moves in the gas pocket 310 .
- the gas pocket 310 may have a partially curved shape to be positioned on the electrode lead 110 as shown in FIGS. 6 and 7 .
- FIG. 8 is a plan view of a pouch-type secondary battery according to a third embodiment of the present invention.
- the gas pocket 310 is integrally formed with the sealing part 220 similar to the pouch-type secondary battery according to the first embodiment. may have an existing form.
- the gas pocket 310 When the gas pocket 310 is bent as in the second embodiment, in order to overcome that the flow or movement of gas may be obstructed, the gas pocket 310 according to the third embodiment is provided with the electrode lead 110 .
- the cover may be formed in a simple form.
- the gas pocket 310 is formed in the form of a pouch in which an excess portion covering the lid can be filled with unsealed gas, and a portion of the gas pocket 310 in contact with the sealing portion 220 is sealed.
- the force may be divided into two different parts.
- the portion in contact with the sealing portion 220 includes a connection sealing portion 221 having a lower sealing force than that of the sealing portion 220 and a peripheral sealing portion 222 , which is a portion having the same sealing force as that of the sealing portion 220 .
- connection sealing part 221 may be located at a portion except for the outer portion of the electrode lead 110 that affects the sealing force between the electrode lead 110 and the case 200 . At this time, in order to maintain the sealing force between the electrode lead 110 and the case 200 while smoothly supplying gas to the gas pocket 310 , the connection sealing part 221 is the electrode lead 110 . ), at least two or more parts may be formed around it.
- a one-way valve may be provided at the outermost part of the connection sealing part 221 , that is, at the point furthest from the sealing part, in order to allow the gas in the accommodation part 210 to move in only one direction.
- the gas passage 311 is integrally formed with the connection seal 221 , the gas passage and the peripheral seal 222 that is a seal 220 other than the gas passage in the gas pocket 310 .
- the surrounding seal can be sealed stronger than other seals.
- the peripheral sealing part 222 has better sealing force than other sealing parts, it is possible to solve the problem that the sealing force of the peripheral portion of the electrode lead 110 is weakened.
- FIG. 9 is a side cross-sectional view of a pouch-type secondary battery according to the present invention.
- the current sensing unit 320 is in contact with the electrode lead contact portion 321 in contact with the electrode lead 110 and the gas pocket 310 to expand the gas pocket 310 . It may include a gas pocket contact part 322 that moves the current sensing part 320 using a force.
- the electrode lead contact portion 321 may be separated from the electrode lead by the expansion of the gas pocket.
- the gas pocket contact part 322 contacts the gas pocket 310 in the direction in which the gas pocket 310 expands.
- the gas pocket contact part 322 may have a wider cross-section than the electrode lead contact part 321 . That is, in the current sensing unit 320, the electrode lead contact portion 321 is between the gas pockets 310, and the gas pocket contact portion 322 is located next to the electrode lead contact portion 321.
- the gas pocket ( 310) may be in contact with.
- the current sensing unit 320 may have a shape such as a T-shape, a cone shape, or a cross-section rising type.
- the current sensing unit 320 may sense a current moving through the electrode lead 110 through the electrode lead contact unit 321 .
- the electrode lead contact part 321 When the electrode lead contact part 321 is out of contact with the electrode lead 110 due to the expansion of the gas pocket 310, the electrode lead contact part 321 can no longer sense a current, and through this, the It is possible to know whether gas is generated inside the payment 21 .
- one side of the current sensing unit 320 may be connected to a voltage measuring device to convert the current sensed by the electrode tap contact unit 321 into a numerical unit or a signal.
- the current sensing unit 320 is preferably a conductor in order to measure the current in contact with the electrode lead 110 as described above. That is, in the current sensing unit 320 , at least the electrode lead contact unit 321 is preferably a conductor.
- the entirety of the current sensing unit 320 may be a conductor, but the outer surface of the current sensing unit 320 , that is, at least the gas pocket contact portion 322 , so that electricity does not flow to other parts of the pouch-type secondary battery such as the gas pocket 310 . ) may be covered with an insulating material.
- the insulating material may be a material having an adhesive force for fixing the current sensing unit 320 .
- the insulating material may include at least one selected from the group consisting of polyethylene, polypropylene, polyvinyl fluoride, polyvinyl alcohol, polyvinyl polyamide imide, epoxy, acrylic, silicone, urethane, thermoplastic urethane, or thermoplastic ether ester. It may be a substance.
- the current sensing unit 320 may measure the amount of gas according to the degree of opening of the gas pocket 310 having several sealed portions because there is one or more.
- the present invention may be a battery module including at least one of the pouch-type secondary batteries described above.
- the battery module may be a pouch-type secondary battery connected in parallel to the battery module. This is because it is easy to recognize when an abnormality occurs in one unit cell when connected in series, whereas it is difficult to detect an abnormality in one unit cell in unit cells connected in parallel.
- the present invention may be a battery pack including the pouch-type secondary battery as described above.
- FIG. 10 is a schematic diagram of a method for manufacturing a pouch-type secondary battery according to the present invention.
- a portion to be the gas pocket 310 formed in the case and the electrode lead 110 may be first bonded, and then the remaining portion may be bonded. At this time, the portion to be the gas pocket 310 may be folded to form no empty space as shown in FIG. 10 after bonding, and then a contact portion with the remaining electrode lead 110 may be further welded.
- the present invention also provides a battery pack including the pouch-type secondary battery and a device including the battery pack, and since the battery pack and device are known in the art, detailed descriptions thereof are provided in the present specification. omit
- the device is, for example, a notebook computer, a netbook, a tablet PC, a mobile phone, an MP3, a wearable electronic device, a power tool, an electric vehicle (EV), a hybrid electric vehicle (HEV) , a Plug-in Hybrid Electric Vehicle (PHEV), an electric bicycle (E-bike), an electric scooter (E-scooter), an electric golf cart, or a system for power storage.
- EV electric vehicle
- HEV hybrid electric vehicle
- PHEV Plug-in Hybrid Electric Vehicle
- E-bike electric bicycle
- E-scooter electric golf cart
- a system for power storage or a system for power storage.
- the present invention is not limited thereto.
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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)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
Description
Claims (16)
- 전극 리드가 돌출되어 있는 전극조립체;상기 전극조립체를 수납하는 수납부를 포함하는 케이스; 및상기 전극 리드 상에 배치되어 있는 가스 포켓과 상기 가스 포켓의 팽창에 따라 이동하는 전류감지부를 포함하는 위험감지장치;를 포함하는 파우치형 이차전지.
- 제1항에 있어서,상기 전류감지부는,상기 전극 리드와 접촉하는 전극 리드 접촉부; 및상기 가스 포켓과 접하여 상기 가스 포켓의 팽창하는 힘을 이용해 상기 전류 감지부를 이동시키는 가스 포켓 접촉부;를 포함하는 파우치형 이차전지.
- 제2항에 있어서,상기 전극 리드 접촉부는 상기 가스 포켓의 팽창에 의해 상기 전극 리드와의 거리가 멀어지는 것을 특징으로 하는 파우치형 이차전지.
- 제2항에 있어서,상기 가스 포켓 접촉부는 상기 가스 포켓이 팽창하는 방향에서 상기 가스 포켓과 접촉하는 것을 특징으로 하는 파우치형 이차전지.
- 제4항에 있어서,상기 가스 포켓 접촉부는 상기 전극 리드 접촉부보다 단면 넓이가 더 넓은 것을 특징으로 하는 파우치형 이차전지.
- 제2항에 있어서,상기 전류감지부는 적어도 상기 전극 리드 접촉부가 도체인 것을 특징으로 하는 파우치형 이차전지.
- 제6항에 있어서,상기 전류감지부는 적어도 가스 포켓 접촉부의 외면이 절연소재로 이루어진 것을 특징으로 하는 파우치형 이차전지.
- 제7항에 있어서,상기 절연소재는 접착력이 있는 소재인 것을 특징으로 하는 파우치형 이차전지.
- 제1항에 있어서,상기 전류감지부의 일측은 전압측정장치에 연결되어 있는 것을 특징으로 하는 파우치형 이차전지.
- 제1항에 있어서,상기 가스 포켓과 상기 수납부가 연결되는 부분은 상기 밀봉부보다 약하게 밀봉되어 있는 것을 특징으로 하는 파우치형 이차전지.
- 제10항에 있어서,상기 가스 포켓은 상기 수납부 내부 압력이 설정된 범위 이상인 경우 팽창하는 것을 특징으로 하는 파우치형 이차전지.
- 제1항에 있어서,상기 가스 포켓은 일면은 상기 전극 리드에, 타면은 상기 전류감지부에 접촉하여 있는 것을 특징으로 하는 파우치형 이차전지.
- 제1항에 있어서,상기 가스 포켓은 상기 전류감지부의 양측에 각 하나씩 존재하는 것을 특징으로 하는 파우치형 이차전지.
- 제1항에 있어서,상기 가스 포켓은 상기 전극 리드가 돌출되는 부위의 밀봉부에 의해 형성되는 테라스부 위에 존재하거나 적어도 상기 전극 리드 상에 배치된 것을 특징으로 하는 파우치형 이차전지.
- 제1항 내지 제14항에 따른 파우치형 이차전지를 포함하는 배터리 모듈.
- 제15항에 있어서,상기 파우치형 이차전지는 병렬로 연결되어 있는 것을 특징으로 하는 배터리 모듈.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17/915,839 US20230155216A1 (en) | 2020-07-15 | 2021-06-22 | Pouch-Shaped Secondary Battery with Improved Safety and Battery Module Including the Same |
| ES21842136T ES3053433T3 (en) | 2020-07-15 | 2021-06-22 | Pouch-shaped secondary battery with improved safety and battery module including the same |
| CN202180023668.6A CN115413385B (zh) | 2020-07-15 | 2021-06-22 | 具有改进的安全性的袋状二次电池和包括其的电池模块 |
| JP2022558530A JP7471728B2 (ja) | 2020-07-15 | 2021-06-22 | 安全性の向上したパウチ型二次電池及びこれを含むバッテリーモジュール |
| EP21842136.0A EP4113734B1 (en) | 2020-07-15 | 2021-06-22 | Pouch-shaped secondary battery with improved safety and battery module including the same |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020200087180A KR102916647B1 (ko) | 2020-07-15 | 2020-07-15 | 안전성이 향상된 파우치형 이차전지 및 이를 포함하는 배터리 모듈 |
| KR10-2020-0087180 | 2020-07-15 |
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| Publication Number | Publication Date |
|---|---|
| WO2022014888A1 true WO2022014888A1 (ko) | 2022-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2021/007778 Ceased WO2022014888A1 (ko) | 2020-07-15 | 2021-06-22 | 안전성이 향상된 파우치형 이차전지 및 이를 포함하는 배터리 모듈 |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20230155216A1 (ko) |
| EP (1) | EP4113734B1 (ko) |
| JP (1) | JP7471728B2 (ko) |
| KR (1) | KR102916647B1 (ko) |
| CN (1) | CN115413385B (ko) |
| ES (1) | ES3053433T3 (ko) |
| WO (1) | WO2022014888A1 (ko) |
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Also Published As
| Publication number | Publication date |
|---|---|
| ES3053433T3 (en) | 2026-01-22 |
| EP4113734B1 (en) | 2025-10-08 |
| CN115413385B (zh) | 2024-06-21 |
| US20230155216A1 (en) | 2023-05-18 |
| EP4113734A4 (en) | 2024-06-19 |
| CN115413385A (zh) | 2022-11-29 |
| KR102916647B1 (ko) | 2026-01-22 |
| JP2023519000A (ja) | 2023-05-09 |
| JP7471728B2 (ja) | 2024-04-22 |
| EP4113734A1 (en) | 2023-01-04 |
| KR20220009009A (ko) | 2022-01-24 |
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