WO2022149941A1 - 팽창완화 유닛을 포함하는 전지 모듈 - Google Patents
팽창완화 유닛을 포함하는 전지 모듈 Download PDFInfo
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- WO2022149941A1 WO2022149941A1 PCT/KR2022/000416 KR2022000416W WO2022149941A1 WO 2022149941 A1 WO2022149941 A1 WO 2022149941A1 KR 2022000416 W KR2022000416 W KR 2022000416W WO 2022149941 A1 WO2022149941 A1 WO 2022149941A1
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- Prior art keywords
- battery
- cell
- expansion
- battery module
- module
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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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
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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
- H01M10/0481—Compression means other than compression means for stacks of electrodes and separators
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
- H01M10/647—Prismatic or flat cells, e.g. pouch 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
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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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular 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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch 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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
- H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
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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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
- H01M50/291—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by their shape
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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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
- H01M50/293—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs 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
- H01M50/30—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
- 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 battery module including an expansion/relaxation unit.
- a battery module including an expansion relief unit capable of preventing a shortening of the life of the battery cell by arranging an expansion relief unit capable of pressurizing the battery cell in the case and/or inside of the battery module to relieve lithium plating behavior is about
- EVs electric vehicles
- HEVs hybrid electric vehicles
- P-HEVs plug-in hybrid electric vehicles
- ESSs energy storage devices
- Lithium secondary batteries act as batteries by repeating insertion and desorption of lithium ions from the negative electrode and the positive electrode. There is an electrolyte containing lithium salts between these electrodes, in which lithium ions move but electrons do not.
- lithium plating causes a side reaction with the electrolyte, change of the kinetic balance of the secondary battery, and the like. This not only reduces the capacity and cycle life of the battery, but also causes a safety problem in that the overcharge control function is lost.
- lithium metal deposits as dendrites on the electrode surface, seriously threatening the safety of the battery.
- metallic lithium deposited as a dendrite penetrates the separator and comes into contact with the opposite electrode, it causes an internal short circuit, resulting in a rapid chemical reaction and temperature rise. As a result, the cell or module can ignite and explode, with dangerous consequences.
- Lithium plating occurs more at a position near the protruding electrode tab of the battery cell, and the cell expands at the position as the number of charge/discharge and cycle increases. This phenomenon is larger in a battery module in which a plurality of battery cells are stacked than in a unit battery cell.
- the cycle life of the battery cells constituting the battery module may be shorter than that of the unit battery cells, and the scale of the accident may increase due to the plurality of battery cells.
- the battery module 100 includes a cell stack 200 in which a plurality of battery cells 21, 22, ..., n-1, n are stacked in a module case (reference numerals not shown). stored within The outer wide surfaces of the two battery cells 21 and n disposed on the outermost side of the cell stack 200 face the first side cover 130 and the second side cover 140 of the module case, respectively, and the An expansion relief control pad 180 is positioned between the outermost battery cell and the side cover of the module case, and a resin for fixing the cell stack 200 between the cell stack 200 and the lower cover 120 .
- Layer 400 may be interposed.
- an adhesive 300 may be interposed between the battery cells facing each other at a predetermined portion.
- the battery cells 21, 22, ..., n-1, n in the battery module 100 according to the prior art are repeatedly expanded and contracted during charging and discharging, and the electrode active material is dropped or deteriorated due to the deformation, In addition, it triggers a side reaction to deteriorate the performance of the battery.
- the cell swell is generally provided with an expansion relief pad 180 between the module case and the outermost battery cell or between the battery cells, so that when the battery cell expands, it is compressed and acts as a buffer. Controlling the swelling.
- FIG. 4 is a battery cell according to the prior art (21, 22, ..., n-1, n) using one battery cell 21 disposed at the outermost side as an example to explain before and after deformation of the battery cell It is a schematic diagram for This expansion may appear in all battery cells including the battery cell disposed at the outermost layer. Referring to FIG. 4 , the portion adjacent to the electrode tab and the electrode lead 2 of the battery cell 21 expands relatively more. As the expansion of the central part is suppressed, the left and right outer shells where the electrode tabs are located rather expand by the gases generated inside. As charging and discharging continue, this type of deformation becomes more and more significant. In the cell stack 200 in which each of the battery cells is expanded and a plurality of them are combined, the deformation of the shape appears even greater. This not only shortens the life of the battery module 100, but also causes accidents such as fire.
- Lithium-plating of the battery cells (21, 22, ..., n-1, n) in the battery module 100 is alleviated, thereby extending the life of the battery cells in the battery module 100, and also the battery module should increase the stability of However, there is a limit to suppressing the lithium-plating phenomenon due to the electrochemical mechanism of the battery cell.
- Patent Document 1 forms a microcapsule containing a stabilizing material for stabilizing lithium precipitated from the negative electrode during overcharging of the secondary battery between the negative electrode and the separator between the negative electrode and the separator, and the surface of the microcapsule collapses when the secondary battery is overcharged so that the stabilizing material is leaked.
- a lithium secondary battery for stabilizing lithium formed in a thermoplastic resin layer.
- Patent Document 2 is a method for detecting lithium precipitation on a negative electrode in real time by observing a change in battery voltage according to SOC when charging a secondary battery, characterized in that the point at which the battery voltage increase rate slows down is determined as the lithium precipitation point A method for detecting lithium precipitation was disclosed.
- Patent Documents 1 and 2 disclose a technology for securing safety by lithium precipitation in a lithium secondary battery
- the battery cell disposed in the battery module is equipped with an expansion relief unit for alleviating the expansion generated during the charging and discharging process.
- the battery module is not disclosed.
- Patent Document 1 Republic of Korea Patent Publication No. 2017-0111566
- Patent Document 2 Republic of Korea Patent Publication No. 2017-0023583
- An object of the present invention is to solve the above problems, and to provide a battery module including an expansion relief unit that can prevent shortening of the life of the battery cell in the battery module while using the existing battery module and battery cell as it is do.
- Another object of the present invention is to provide a battery module including an expansion relief unit in which gas generated in the process of using the battery module does not stay in the electrode assembly of the battery cell and can move quickly to the periphery.
- a battery module according to the present invention includes a cell stack in which one or more battery cells are stacked and a module case for accommodating the cell stack therein, and the most An expansion relief unit having a convex portion capable of pressing at least a portion of the battery cell may be disposed to face the outermost battery cell disposed outside.
- the expansion relief unit may include an expansion relief unit positioned between an outermost battery cell disposed at the outermost part of the cell stack and the module case.
- the expansion relief unit may be disposed for all of the outermost battery cells disposed in the outermost of the cell stack.
- the convex portion of the expansion relief unit may be located only in a predetermined portion of the central portion of the outermost battery cell.
- the convex portion of the expansion relief unit may be formed of an elastic material.
- the convex portion of the expansion relief unit may be deformed into a concave shape when a predetermined pressure or more is applied.
- An adhesive layer may be used between the surfaces of the battery cells facing each other.
- the adhesive layer may be applied to the entire surface facing the battery cells.
- the expansion relief unit may be integrally formed with the side cover of the module case.
- the present invention may also provide a battery pack including the battery module and a device including the battery pack.
- one or two or more non-conflicting components among the above components may be selected and combined.
- the expansion relief unit in the outermost battery cell, it is possible to suppress abnormal expansion according to the number of times of charging and discharging of the battery cell and the battery module, thereby preventing shortening of the service life of the battery cell, Accordingly, stability can also be improved.
- the convex portion of the expansion relief unit is deformed into a concave shape above a certain pressure, the pressure on the center of the battery cell and battery module is reduced, so that the electrode tab does not expand, thereby reducing the occurrence of lithium-plating. Therefore, it is possible to prevent accidents such as a rise in the internal temperature of the battery cell and fire of the battery module.
- the expansion/relaxation unit according to the present invention can be easily disposed without changing the existing battery module, there is no need to change the battery module production process, so there is an economic advantage.
- FIG. 1 is a schematic diagram of a battery module according to the prior art.
- FIG. 2 is a cross-sectional view taken along line A-A' of FIG. 1 .
- FIG. 3 is an exploded perspective view of the battery module shown in FIG. 1 .
- FIG. 4 is a schematic diagram for explaining the before and after deformation of the battery cell according to the prior art.
- FIG. 5 is an exploded perspective view of a battery module according to a first embodiment of the present invention.
- FIG. 6 is a cross-sectional view taken along line A-A' of FIG. 5 .
- FIG. 7 is an exploded perspective view of a battery module according to a second embodiment of the present invention.
- FIG. 5 is an exploded perspective view of a battery module according to a first embodiment of the present invention
- FIG. 6 is a cross-sectional view taken along line A-A' of FIG. 5 .
- the battery module 1000 includes a plurality of battery cells (not shown) inside a module case (not shown) having a substantially hexahedral shape. It may be configured to include the stacked cell stack 1200 and the expansion relief unit 1500 .
- the module case has an upper cover 1110, a lower cover 1120, and a first side cover 1130 and a second side cover 1140 facing each other so as to be positioned toward the wide side of the cell stack 1200, the electrode tab. It may be composed of a front cover 1150 and a rear cover 1160 positioned on the disposed surface.
- the front cover 1150 and the rear cover 1160 are disposed to face the direction in which the electrode leads of the battery cells are positioned to protect the electrode leads and the bus bar 1170, and the like, and a pair of side covers 1130 and 1140. They protect the side (XZ plane) of the cell stack 1200 accommodated inside the module case.
- the upper cover 1110 and the lower cover 1120 protect the upper and lower portions of the cell stack 1200 .
- upper cover 1110, lower cover 1120, a pair of side covers 1130, 1140, front cover 1150, and rear cover 1160 can be individually manufactured and configured to be assembled with each other, If necessary, it is also possible to manufacture and configure some constituent parts integrally.
- the battery cells having the above configuration are placed in close contact with the side surfaces (XZ plane) in a state in which they stand in parallel with the first side cover 1130 and the second side cover 1140 of the module case, and are placed inside the module case.
- the cell stack 1200 accommodated in the module case inner space is configured by stacking a plurality of battery cells in close contact with a wide surface, and the battery cells include a cell case (not shown) and an electrode lead for accommodating an electrode assembly (not shown). (not shown) is included.
- the cell case is a pouch type (laminate sheet) cell case, and after at least one electrode assembly is accommodated in the receiving unit, the edge is fused to seal the receiving unit, and a pair of electrode leads are connected to both sides or one side of the electrode assembly. It protrudes to the outside of the cell case.
- the anode tab and the cathode tab of the electrode assembly are electrically connected to each other, they may be exposed to the outside of the cell case, or the cell assembly and the electrode lead may be directly connected to each other without the tab.
- the electrode assembly 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, or a stacked assembly in which a rectangular positive electrode and a negative electrode are stacked with a separator interposed therebetween;
- a stack-folding assembly in which unit cells are wound by a long separation film, or a lamination-stacking assembly in which battery cells are stacked with a separator interposed therebetween and attached to each other may be formed, but is not limited thereto.
- the electrode assembly as described above is accommodated in a cell case, and the cell case is typically composed of 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-based 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.
- polyolefin-based 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 expansion relief unit 1500 may be located between a pair of side covers 1130 and 1140 of the module case and the cell stack 1200 .
- the expansion relief unit 1500 as described above has an approximately flat flat plate portion 1520 and a convex portion 1510 formed to protrude toward the cell stack 1200 based on the wide surface (XZ plane) of the flat plate portion 1520.
- the convex portion 1510 may be located at the central portion in the longitudinal direction (X-axis direction) of the flat plate portion 1520, and the convex portion 1510 is located at the outermost portion of the cell stack 1200. It may be located in close contact with the central part of the outermost side surface (X-axis direction of the XZ plane) of the battery cell.
- the portion of the convex portion 1510 in close contact with the outermost side of the outermost battery cell of the cell stack 1200 may have a flat shape or an arc shape.
- the convex part 1510 of the expansion and relief unit 1500 is in close contact with a predetermined part on the central part of the battery cell to relieve the expansion limit through deformation at a predetermined pressure.
- the convex portion 1510 of the expansion and relief unit 1500 is located in close contact with or close to the outermost battery cell of the cell stack 1200 .
- the convex part 1510 when the pressure applied to the convex part 1510 is equal to or greater than a certain pressure due to the expansion of the battery cell according to the charging/discharging process to a certain volume or more, the convex part 1510 is deformed into a rather concave shape as a whole.
- the convex surface of the convex part 1510 is permanently deformed as a whole in the direction of the side covers 1130 and 1140 of the module case, so that the convex part 1510 has a rather concave shape.
- pressure is not applied to the battery cells that have been expanded beyond a certain level.
- the shape of the convex part 1510 is changed closer to the side covers 1130 and 1140 of the module case than the flat part 1520 .
- the expansion and relief unit 1500 that is deformed in shape during the charging/discharging process, it is possible to control the degree of pressurization of the battery cell in which charging and discharging is performed.
- the expansion of the battery according to charging and discharging proceeds naturally, which can provide the most suitable pressure for improving the safety and lifespan of the battery.
- the expansion relief unit 1500 may be initially made of a material having elasticity so as to suppress the expansion of the battery cell.
- the convex portion 1510 of the expansion/relaxation unit 1500 positioned in close contact with the battery cell receives the expansion pressure.
- the convex portion 1510 which is convex toward the side of the battery cell, may be deformed by the expansion of the battery cell, and when the convex portion 1510 is not made of an elastic material, it is broken by the expansion pressure of the battery cell. It may cause damage and cause accidents such as fire. Therefore, by configuring the expansion relief unit 1500 of an elastic material, the battery cell is easily deformed during expansion, which is advantageous in preventing an accident.
- the flat plate portion 1520 of the expansion and relaxation unit 1500 maintains a flat shape regardless of deformation due to expansion and/or contraction of the battery cell, so that the gas generated inside the battery cell moves to both ends of the battery cell. It is advantageous in alleviating the deformation of the cell shape by the lithium plating produced.
- the convex portion 1510 may be in close contact with all or part of the height (Z-axis direction) of the battery cell, and in detail, may be disposed symmetrically from the center to both sides in the height direction. This is advantageous in relieving the expansion as the convex parts 1510 are in close contact with the outside of the central cell case at both ends of the battery cell, which is relatively easy to expand.
- the material of the expansion relief unit 1500 may be a metal or synthetic resin having elasticity, and specifically, a material including a soft elastic material such as polyurethane (PU) or EDPM (Ethlene Propylene Diene Monomer). can do.
- PU polyurethane
- EDPM Ethlene Propylene Diene Monomer
- the elastic material as described above has excellent absorbency to vibration and repulsion by compression, it can guide to provide the battery module 100 having excellent dimensional stability even when cell swelling occurs in a plurality of battery cells. have.
- the battery cell is deformed while suppressing the expansion of the battery cell while maintaining the shape up to a certain pressure, it is not particularly limited to the above materials.
- the expansion relief unit 1500 may have a form in which a convex part 1510 is formed in the center of the flat plate part 1520, and the convex part 150 is One or more may be formed, and the number of the convex portions 1510 is not particularly limited as long as expansion due to lithium plating of the battery cell can be alleviated.
- an adhesive 1300 may be applied between the side surfaces (XZ plane) of adjacent battery cells to adhere the battery cells.
- the adhesive 1300 is preferably applied to the entire side of the adjacent battery cells.
- the adjacent battery cells are stably closely coupled to each other, making the cell more stable.
- a laminate 1200 structure may be formed. Therefore, the cell stack 1200 can be stably accommodated in the module case without interposing the lower cover 1120 of the resin layer 400 used in the battery module according to the prior art.
- the resin layer for fixing the stacked battery cells and the lower surface of the module case in the existing battery module is not used, it is advantageous for the gas generated inside the battery cell to move in all the peripheral directions of the battery cell. As a result, since the gas generated inside the battery cell diffuses quickly and effectively and does not stay in the electrode assembly, the expansion of the battery cell is alleviated, which is advantageous in preventing shortening of the service life.
- the adhesive 1300 may be composed of a polyolefin such as polyethylene (PE), cast polypropylene (cPP), or polypropylene (PP) or a copolymer thereof.
- a polyolefin such as polyethylene (PE), cast polypropylene (cPP), or polypropylene (PP) or a copolymer thereof.
- FIG. 7 is an exploded perspective view of a battery module 2000 according to a second embodiment of the present invention.
- expansion relief unit 2500 is the same as the first embodiment except that it is formed integrally with a pair of side covers 2130 and 2140 of the module case, only the expansion relief unit 2500 will be described below. .
- the expansion relief unit 2500 in the second embodiment according to the present invention may be formed in the central portion of the first side cover 2130 and the second side cover 2140 of the module case in the longitudinal direction (X-axis direction).
- the flat portion of the expansion relief unit 2500 may be the side cover, and a portion of the side cover may be convexly bent toward the cell stack 2200 .
- the expansion relief unit 2500 is shown as being located in the central portion of the height (Z-axis direction) of the side covers 2130 and 2140 of the module case, but may be provided throughout the height (Z-axis direction) and , if the side covers 2130 and 2140 are combined with the upper cover 2110 and the lower cover 2120 to form a module case, it is not particularly limited.
- the expansion/relaxation unit 2500 may have a rectangular shape, and other polygonal, circular, or oval shapes. If elastic deformation is possible by the expansion of the battery cell, the shape is particularly limited. doesn't happen
- the battery module according to the present invention as described above may be applied to various devices and vehicles such as electric vehicles or hybrid vehicles.
- the present invention relates to a battery module comprising a cell stack in which one or more battery cells are stacked and a module case for accommodating the cell stack therein, wherein at least one of the outermost battery cells disposed at the outermost side of the cell stack is provided. It relates to a battery module in which an expansion relief unit provided with a convex portion capable of pressing a portion is disposed, which is industrially available.
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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)
- Battery Mounting, Suspending (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
Claims (11)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17/917,528 US20230135785A1 (en) | 2021-01-11 | 2022-01-11 | Battery module including swelling relief unit |
| CN202280003559.2A CN115461920B (zh) | 2021-01-11 | 2022-01-11 | 电池模块以及包括该电池模块的电池组和装置 |
| ES22736918T ES3014767T3 (en) | 2021-01-11 | 2022-01-11 | Battery module including swelling relief unit |
| EP22736918.8A EP4113724B1 (en) | 2021-01-11 | 2022-01-11 | Battery module including swelling relief unit |
| JP2022567408A JP7625320B2 (ja) | 2021-01-11 | 2022-01-11 | 膨脹緩和ユニットを含む電池モジュール |
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| KR1020210003604A KR102834536B1 (ko) | 2021-01-11 | 2021-01-11 | 팽창완화 유닛을 포함하는 전지 모듈 |
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| EP (1) | EP4113724B1 (ko) |
| JP (1) | JP7625320B2 (ko) |
| KR (1) | KR102834536B1 (ko) |
| CN (1) | CN115461920B (ko) |
| ES (1) | ES3014767T3 (ko) |
| HU (1) | HUE070549T2 (ko) |
| WO (1) | WO2022149941A1 (ko) |
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| KR20230067335A (ko) * | 2021-11-09 | 2023-05-16 | 에스케이온 주식회사 | 배터리 셀 적층체 제조방법 |
| CN118712638A (zh) * | 2023-03-27 | 2024-09-27 | 比亚迪股份有限公司 | 电池模组和车辆 |
| KR20250035238A (ko) * | 2023-09-05 | 2025-03-12 | 삼성에스디아이 주식회사 | 배터리 모듈 |
| CN221057624U (zh) * | 2023-09-21 | 2024-05-31 | 宁德时代新能源科技股份有限公司 | 缓冲垫、电池单体、电池和具有其的用电设备 |
| IT202300021093A1 (it) * | 2023-10-11 | 2025-04-11 | Ferrari Spa | Pacco batteria per un veicolo stradale a propulsione elettrica e metodo di compensazione della variazione di spessore di una cella elettrochimica per tale pacco batteria |
| KR102658636B1 (ko) * | 2023-11-21 | 2024-04-18 | (주)금창 | 리빙 힌지 구조의 배터리 모듈 케이스 |
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- 2021-01-11 KR KR1020210003604A patent/KR102834536B1/ko active Active
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- 2022-01-11 HU HUE22736918A patent/HUE070549T2/hu unknown
- 2022-01-11 US US17/917,528 patent/US20230135785A1/en active Pending
- 2022-01-11 WO PCT/KR2022/000416 patent/WO2022149941A1/ko not_active Ceased
- 2022-01-11 ES ES22736918T patent/ES3014767T3/es active Active
- 2022-01-11 CN CN202280003559.2A patent/CN115461920B/zh active Active
- 2022-01-11 JP JP2022567408A patent/JP7625320B2/ja active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| EP4113724B1 (en) | 2025-02-26 |
| JP2023525016A (ja) | 2023-06-14 |
| CN115461920A (zh) | 2022-12-09 |
| CN115461920B (zh) | 2025-01-28 |
| KR102834536B1 (ko) | 2025-07-15 |
| HUE070549T2 (hu) | 2025-06-28 |
| ES3014767T3 (en) | 2025-04-24 |
| KR20220101507A (ko) | 2022-07-19 |
| EP4113724A1 (en) | 2023-01-04 |
| US20230135785A1 (en) | 2023-05-04 |
| JP7625320B2 (ja) | 2025-02-03 |
| EP4113724A4 (en) | 2023-09-20 |
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