WO2016080696A1 - Plaque de refroidissement pour batterie secondaire et module de batterie secondaire muni de celle-ci - Google Patents

Plaque de refroidissement pour batterie secondaire et module de batterie secondaire muni de celle-ci Download PDF

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Publication number
WO2016080696A1
WO2016080696A1 PCT/KR2015/012048 KR2015012048W WO2016080696A1 WO 2016080696 A1 WO2016080696 A1 WO 2016080696A1 KR 2015012048 W KR2015012048 W KR 2015012048W WO 2016080696 A1 WO2016080696 A1 WO 2016080696A1
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WIPO (PCT)
Prior art keywords
cooling plate
secondary battery
rib
plate
cooling
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PCT/KR2015/012048
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English (en)
Korean (ko)
Inventor
최승렬
Original Assignee
주식회사 엘지화학
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Priority claimed from KR1020150154411A external-priority patent/KR101816974B1/ko
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to JP2017519302A priority Critical patent/JP6448069B2/ja
Priority to EP15861814.0A priority patent/EP3223357B1/fr
Priority to US15/515,221 priority patent/US10847850B2/en
Publication of WO2016080696A1 publication Critical patent/WO2016080696A1/fr

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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
    • 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
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H01M10/6555—Rods or plates arranged between the cells
    • 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
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • 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
    • 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
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/222—Inorganic material
    • H01M50/224—Metals
    • 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
    • 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 provides a cooling plate for a secondary battery that can improve the safety of the battery by minimizing deformation when penetrating the battery module due to external shock and stimulation, and as a result, reducing the impact on adjacent unit cells, as well as excellent cooling effect; It relates to a secondary battery module including the same.
  • pouch type secondary batteries that can be applied to products such as mobile phones with a thin thickness in terms of battery shape, and lithium ion batteries with high energy density, discharge voltage, and output stability in terms of materials, and lithium ion polymer batteries.
  • lithium secondary batteries There is a high demand for lithium secondary batteries.
  • the secondary battery may have various shapes such as a cylindrical shape and a square shape.
  • the secondary battery When the secondary battery is used to drive a motor requiring a large power, for example, an electric vehicle, the secondary battery may be connected in series using a plurality of secondary batteries as a unit cell.
  • a large capacity secondary battery assembly (hereinafter referred to as a 'battery module') will be constructed.
  • Each unit cell constituting the battery module includes an electrode assembly in which a positive electrode plate and a negative electrode plate are laminated through a separator, a battery case including a space part in which the electrode assembly is embedded, and partially exposed to the outside of the battery case. It includes a positive electrode provided in the electrode assembly, positive and negative electrode terminals electrically connected to the current collector of the negative electrode plate.
  • Each unit cell is, for example, in the case of a rectangular secondary battery, and the positive terminal and the negative terminal protruding from the upper part of the battery case are arranged alternately with the positive terminal and the negative terminal of the neighboring unit cell, and then the negative terminal and the positive terminal are respectively connected.
  • the battery module is configured.
  • the battery module is configured by connecting several to several dozen unit cells, heat generated in each unit cell should be easily discharged.
  • the heat dissipation characteristics of the battery module are very important to determine the performance of the battery.
  • the charge and discharge of the battery is accompanied by heat entry and exit, the amount of heat generated is proportional to the capacity of the unit cell, that is, the number of stacked unit cells. Heat generated during charging and discharging is released during the resting period. The thicker the battery, the heat generated during the discharge tends not to be released sufficiently during the resting period. If the heat generated in this manner accumulates in the battery, the temperature inside the battery is increased, and as a result, the battery performance is degraded, and in severe cases, the risk of explosion is caused.
  • the battery module when the battery module is applied as a large-capacity secondary battery for driving an electric vacuum cleaner, an electric scooter, or a motor for an automobile, since the battery module is charged and discharged with a large current, the temperature of the battery is increased to a considerable temperature by the heat generated inside the battery. do.
  • Patent Document 1 Korean Patent Publication No. 2012-0048938 (2012.05.16 publication)
  • the first technical problem to be solved by the present invention is to minimize the deformation when penetrating the battery module due to the external shock and stimulation, with excellent cooling effect, and as a result the effect on the adjacent unit cell is reduced in the unit cell It is to provide a secondary battery cooling plate that can improve the safety of the battery, such as the occurrence of short.
  • a second technical problem to be solved by the present invention is to provide a secondary battery module and a battery pack including the cooling plate.
  • a plurality of cooling units are formed spaced apart from each other along the longitudinal direction in the cooling plate, a plurality of inner surfaces of the cooling unit Provided is a cooling plate for a secondary battery in which reinforcing ribs are formed.
  • a secondary battery module in which a plurality of unit cells capable of charging and discharging are arranged at intervals, a secondary battery module having the cooling plate interposed between the unit cells is provided. do.
  • a battery pack including the secondary battery module.
  • the cooling plate for a secondary battery In the cooling plate for a secondary battery according to the present invention, deformation is minimized when penetrating the battery module due to external shock and stimulus, and as a result, shortening occurs in the unit cell in the battery module by reducing the influence of deformation of the cooling plate on the unit cell. By suppressing this, battery safety can be improved. In addition, it is possible to effectively dissipate the heat generated during charging and discharging to prevent the deterioration of the capacity characteristics of the battery, and to improve the battery life characteristics and the reliability of battery performance.
  • FIG. 1 is a perspective view schematically showing the structure of a secondary battery cooling plate according to an embodiment of the present invention.
  • FIG. 2 is a perspective view of a cooling unit having various structures in a cooling plate for a secondary battery according to an embodiment of the present invention.
  • FIG 3 is a perspective view illustrating a cooling unit having various structures in a cooling plate for a secondary battery according to an embodiment of the present invention.
  • FIG. 4 is a perspective view illustrating a cooling unit having various structures in a cooling plate for a secondary battery according to an embodiment of the present invention.
  • FIG. 5 is an exploded perspective view schematically showing the structure of a secondary battery module according to an embodiment of the present invention.
  • FIG. 6 is a graph showing the results of observing the heat radiating effect of the cooling plate in Experimental Example 1.
  • FIG. 8 is a diagram illustrating a nail penetration experiment when a flat plate cooling plate is installed.
  • FIG. 9 is a diagram illustrating a nail penetration experiment when a cooling plate according to an embodiment of the present invention is installed.
  • FIG. 1 is a perspective view schematically showing the structure of a secondary battery cooling plate according to an embodiment of the present invention. 1 is only an example for describing the present invention and the present invention is not limited thereto.
  • a secondary battery cooling plate 20 is a flat plate cooling plate, and includes a plurality of cooling units along a length direction (y-axis direction) in the cooling plate. 21 are spaced apart from each other, and a plurality of reinforcing ribs 22 are formed on the inner side of the cooling unit.
  • an upper portion of the cooling unit 21 may further include a reinforcing portion 23 for installing and supporting the cooling plate in the secondary battery module.
  • the cooling plate is interposed between the unit cells to prevent volume expansion and breakage of the unit cells, and serves to increase the cooling efficiency of the unit cells by quickly dissipating heat generated from the unit cells to the outside.
  • a flat plate cooling plate made of aluminum is mainly used as the cooling plate, and is included in close contact between unit cells without a space in the battery module. Accordingly, when an external shock is applied as in the nail penetration test, deformation occurs in the vertical direction on the cooling plate, which deforms an adjacent unit cell and causes a short. In addition, during charge and discharge, especially during charge and discharge at high temperatures, the heat generated in the unit cell is not sufficiently cooled during the rest step between charge and discharge cycles and accumulates to accelerate the deterioration of the battery capacity, thereby improving the life characteristics and battery performance. It lowered the reliability.
  • the cooling of the cooling plate when the impact and stimulus from the outside, such as nail penetration test is applied, the cooling of the cooling plate to minimize the deformation of the cooling plate to reduce the deformation of the adjacent unit cell, as a result, to suppress the occurrence of short
  • a cooling portion 21 in the form of an empty space in the plate 20 and forming a reinforcing rib 22 in the cooling portion to have a concave-convex structure it is possible to generate a charge and discharge of the space together with a reinforcing effect. By dissipating heat effectively, it is characterized by improving battery safety, life characteristics and reliability of battery performance.
  • a plurality of cooling parts 21 are formed spaced apart from each other along the longitudinal direction (y-axis direction), and a plurality of cooling plates 21 are formed on the inner surface of the cooling part. Reinforcing ribs 22 are formed.
  • the cooling plate 20 may be a single structure in which the cooling unit is formed, or two or more layers of structures in which two or more plates are disposed to face each other so that the cooling unit is formed.
  • the cooling plate when the cooling plate is a two-layer structure, the cooling plate includes a first plate and a second plate to be detachably coupled, the longitudinal direction of the cooling plate (y-axis between the first plate and the second plate) Direction; and a plurality of cooling parts spaced apart along each other, wherein a plurality of reinforcing ribs are formed on an inner surface of the cooling part, the reinforcing ribs protruding from the plurality of first ribs protruding from the first plate and the second plate. It may include a plurality of second ribs formed.
  • each of the first and second plate members may independently have a thickness of 0.2 times to 0.5 times, more specifically, 0.25 times to 0.4 times the thickness of the cooling plate.
  • the plurality of first ribs protruding from the first plate member may have a width of 0.1 mm to 1 mm, and may be spaced apart at intervals of 0.1 mm to 1 mm in the unit cooling unit.
  • the width and the separation distance of each of the unit ribs may be uniform or non-uniform within the above range.
  • the first rib may have a height corresponding to a thickness of 0.1 times to 0.3 times, more specifically, 0.15 times to 0.25 times the thickness of the cooling plate.
  • the height of each of the unit ribs may be the same within the above range, or may be different.
  • the plurality of second ribs protruding from the second plate member may have a width of 0.1 mm to 1 mm, and may be spaced apart at intervals of 0.1 mm to 1 mm in the unit cooling unit.
  • the width and the separation distance of each of the unit ribs may be uniform or non-uniform within the above range.
  • the second rib may have a thickness corresponding to a thickness of 0.1 times to 0.3 times, more specifically, 0.15 times to 0.25 times the thickness of the cooling plate.
  • the height of each of the unit ribs may be the same within the above range, or may be different.
  • the first and second ribs may have the same width or different widths within the above-described range.
  • first and second ribs may be formed to be spaced apart from each other within the above-mentioned range, or to be spaced apart from each other by the same distance to be staggered, or may be formed spaced apart from each other to correspond only a part. have.
  • first and second ribs may have the same height or may have different heights.
  • each of the first and second ribs may have various shapes such as quadrangular, hemispherical, pyramid, and the like, and any one or two or more of them may be mixed and included.
  • the first and second ribs may have the same shape or may have different shapes.
  • a partition portion may be further provided in the cooling plate 20 to partition the plurality of cooling portions between the first plate member and the second plate member, and the partition portion may have an inner surface of the first plate member and the second plate member. In each protruding from each end can be abutted.
  • the partition may have a width of 0.1mm to 2mm, more specifically 0.5mm to 1mm.
  • the first rib and the second rib may be disposed to face each other.
  • the ends of the first rib and the second rib may be disposed to face each other at a predetermined interval.
  • the end portion of the first rib and the end portion of the second rib may be disposed facing away from each other at intervals corresponding to the thickness of 0.05 times to 0.15 times, more specifically 0.1 times to 0.14 times the thickness of the cooling plate. have.
  • the first rib and the second rib may be disposed to be shifted.
  • each end of the first rib and the second rib may overlap each other, or the ends of the first rib and the second rib may be positioned in a straight line.
  • each end of the first rib and the second rib is 0.05 to 0.1 times the thickness of the cooling plate, more specifically 0.06 to 0.08 Can be overlapped to the height corresponding to the thickness of the pear.
  • 2 to 4 show various forms of reinforcing ribs protruding in the cooling portion of the cooling plate in the cooling plate of the two-layer structure. 2 to 4 are only examples for explaining the present invention, but the present invention is not limited thereto.
  • the cooling plate 20 when the cooling plate 20 is a two-layer structure, the cooling plate 20 is detachably coupled to the first plate 20a and the second plate 20b.
  • a plurality of cooling parts 21 spaced apart along the longitudinal direction (y-axis direction) of the cooling plate, and a plurality of reinforcing ribs 22 are formed on the inner surface of the cooling part 21.
  • the reinforcing rib 22 may include a plurality of first ribs 22a protruding from the first plate 20a and a plurality of second ribs 22b protruding from the second plate 20b. have.
  • a partition 21c may be further provided between the first plate 20a and the second plate 20b to partition the plurality of cooling units 21, and the partition 21c may be formed in the first plate 20a and the second plate 20b. Protrusions are formed on the inner surfaces of the first plate member 20a and the second plate member 20b, respectively, so that each end portion may abut.
  • a1 denotes the thickness of the first plate 20a
  • b1 denotes the thickness of the second plate
  • c1 denotes the height of the first rib 22a
  • d1 denotes the height of the second rib 22b
  • e1 represents the interval (or separation distance) between the distal end of the first rib (22a) and the distal end of the second rib (22b), the specific value is the same as described above.
  • the first rib 22a and the second rib 22b may be disposed to face each other.
  • end portions of the first rib 22a and the second rib 22b may be disposed to face each other at a predetermined interval, and more specifically, the first rib 22a and the first rib 22a may be disposed to face each other.
  • the ends of the two ribs 22b may be disposed to face each other at a separation distance e1 corresponding to a thickness of 0.05 to 0.15 times the thickness of the cooling plate.
  • the thickness (a1, b1) of the first plate and the second plate, the height (c1, d1) of the first rib and the second rib, and the separation distance e1 between the end of the first rib and the end of the second rib corresponds to the thickness of the cooling plate.
  • the first rib 22a and the second rib 22b may be disposed to be offset.
  • each end of the first rib 22a and the second rib 22b may overlap each other as shown in FIG. 3 or the first rib 22a and the second rib 22b as shown in FIG. 4.
  • the ends of may be located in a straight line.
  • the height e2 of the overlap portion is 0.05 to 0.1 times the thickness of the cooling plate, more specifically 0.06 to 0.08 Can be overlapped to the height corresponding to the thickness of the pear.
  • the height of the first rib and the second rib is subtracted from the total length of the thickness (a2, b2) of the first plate and the second plate and the height (c2, d2) of the first rib and the second rib.
  • the length a1 + b1 + c1 + d1-e1 corresponds to the thickness of the cooling plate.
  • the thicknesses a3 and b3 of the first and second plates and the first and second ribs corresponds to the thickness of the cooling plate.
  • the cooling plate 20 may further include a reinforcing part 23 for installing and supporting the cooling plate in the secondary battery module on the upper part of the cooling part 21. Accordingly, the surface on which the cooling unit 21 in the cooling plate is located is in contact with the heat generating surface of the unit cell, and the reinforcing unit 22 passes outside the unit cell.
  • the reinforcing portion 23 may be a rectangular flat plate, may be formed integrally with the cooling unit on the cooling unit 21, or formed as a separate member from the cooling unit and then welded It may be bonded.
  • the cooling plate 20 may specifically have a flat plate shape, and may have a size corresponding to the front surface of the unit cell.
  • the cooling plate as described above is in contact with the front surface of one side of the unit cell, one side end passes through the outside of the unit cell. Accordingly, the cooling air supplied to the secondary battery module cools the heat transferred to the cooling plate to the outside while flowing through the mesh in the cooling plate.
  • the cooling plate 20 can be used without particular limitation as long as it is generally used for the manufacture of the cooling plate. Specifically, aluminum, aluminum alloy, stainless steel, copper, silver, aluminum oxide, etc. may be mentioned, One of these alone or a mixture of two or more thereof may be used. More specifically, the cooling plate 20 may include aluminum or an aluminum alloy.
  • the first plate, the second plate, the first rib, the second rib, the partition, and the reinforcing part of the cooling plate may also include the same material as described above.
  • the thickness of the cooling plate 20 may be 1.5mm to 3mm, more specifically 1.7mm to 2mm.
  • the cooling plate 20 preferably has an opening ratio of 70% by volume to 90% by volume.
  • an opening ratio of 70% by volume to 90% by volume.
  • a secondary battery module including the cooling plate is provided.
  • the secondary battery module a plurality of unit cells capable of charging and discharging are arranged at intervals, and the cooling plate is interposed between the unit cells.
  • 5 is an exploded perspective view schematically showing the structure of a secondary battery module according to an embodiment of the present invention. 5 is only an example for describing the present invention and the present invention is not limited thereto.
  • a plurality of unit cells 10 capable of charging and discharging are arranged at intervals, and between the unit cells 10.
  • a plate-shaped cooling plate 20 is interposed therebetween, and a plurality of cooling parts 21 are formed spaced apart from each other along the longitudinal direction (y-axis direction) in the cooling plate, and a plurality of reinforcing ribs are provided on an inner side surface of the cooling part. (22) is formed.
  • the secondary battery module 100 is a plurality of unit cells are electrically connected in series or in parallel by a connector (not shown), at the same time, tightened, modularized by a binding band (not shown), wherein
  • the secondary battery module 100 includes a cooling plate 20 disposed between each unit cell 10.
  • the secondary battery module 100 may further include an ending plate (not shown) for preventing damage to the unit cell 10 when the binding band is tightened.
  • the secondary battery module may be installed in a separate housing (not shown) forming an outer case, wherein the cooling air supplied to the housing passes through the cooling plate 20 interposed between the unit cells 10, In this process, heat generated in the unit cell is exchanged, and the exchanged air is discharged to the outside of the housing to release heat generated in the unit cell to the outside.
  • the unit cell 10 is a unit for producing power by having an electrode assembly in which the positive electrode plate and the negative electrode plate with the separator interposed therebetween, it will be included in the form stored in the battery case Can be.
  • the unit cell 10 is an electrode assembly, a battery case having an inner space for accommodating the electrode assembly, one end (eg, one end) is connected to the electrode assembly, the other end (eg, The other end) may include an electrode lead of the positive and negative electrodes protruding out of the battery case, and a sealing part sealing the inlet of the battery case.
  • the battery case in the unit cell 10 may be a pouch-type battery case composed of an upper laminate sheet and a lower laminate sheet, the upper laminate sheet and the lower laminate sheet is formed by heat-sealed along the outer peripheral surface of the battery case It may be implemented in a structure having a sealing portion.
  • the upper and lower laminate sheets constituting the battery case may be a laminate sheet including a metal layer and a resin layer covering them.
  • a polyolefin-based resin layer (Polyolepin Layer), which is an inner layer serving as a sealing material, having a thermal compression property, and a metal foil layer (mainly an aluminum layer) that maintains mechanical strength and serves as a barrier layer of water and oxygen.
  • an outer layer (mainly a nylon layer) serving as a protective layer are composed of a multilayer film structure in which a stack is sequentially stacked.
  • Commonly used as the polyolefin-based resin layer is CPP (Casted Polypropylene).
  • the sealing part is formed by applying heat and pressure to the outer circumferential surface portion where the upper laminate sheet and the lower laminate sheet of the battery case are in contact with each other by thermally compressing the resin layer.
  • the thermocompression process may be performed under conditions of 0.1 MPa to 10 MPa under 120 to 250 ° C. using electric heat and a press.
  • the electrode lead protrudes from the outer circumferential surface of the upper end of the battery case in which the electrode lead is placed, the insulating film between the electrode lead can be improved in consideration of the thickness of the electrode lead and heterogeneity with the battery case material.
  • thermally crimp in the state of being interposed therebetween, it is not necessarily limited thereto.
  • the electrode assembly is not particularly limited as long as it is a structure that connects a plurality of electrode tabs to form an anode and a cathode.
  • the electrode assembly may be a stacked electrode assembly in which a positive electrode plate including a positive electrode active material coating part on at least one surface of the positive electrode current collector and a negative electrode plate including a negative electrode active material coating part on at least one surface of the negative electrode current collector are laminated through a separator. have.
  • the electrode assembly is a jelly-roll type electrode assembly wound so that the positive electrode plate including a positive electrode active material coating portion on at least one surface of the positive electrode current collector, and the negative electrode plate including the negative electrode active material coating portion on at least one surface of the negative electrode current collector to face through a separator.
  • the positive electrode plate including a positive electrode active material coating portion on at least one surface of the positive electrode current collector
  • the negative electrode plate including the negative electrode active material coating portion on at least one surface of the negative electrode current collector to face through a separator.
  • the electrode assembly may include a plurality of unit electrode assemblies in which a positive electrode plate including a positive electrode active material coating part on at least one surface of the positive electrode current collector and a negative electrode plate including a negative electrode active material coating part on at least one surface of the negative electrode current collector are laminated through a separator. Each overlapping portion is interposed with a separation film, and the separation film may be a stack-foldable electrode assembly surrounding each unit electrode assembly.
  • the electrode assembly may be a stack-foldable electrode assembly.
  • the negative electrode plate includes a negative electrode current collector, and a negative electrode active material coating portion coated with a negative electrode active material on at least one side, preferably both sides of the negative electrode current collector.
  • the negative electrode current collector is not particularly limited as long as it has high conductivity without causing chemical change in the battery.
  • copper, stainless steel, aluminum, nickel, titanium, calcined carbon, copper, Surface treated with carbon, nickel, titanium, silver or the like on the surface of the stainless steel, aluminum-cadmium alloy and the like can be used.
  • the negative electrode current collector may have a thickness of 3 ⁇ m to 500 ⁇ m.
  • fine concavities and convexities may be formed on the surface of the negative electrode current collector to enhance the bonding force of the negative electrode active material.
  • it can be used in various forms, such as a film, a sheet, a foil, a net, a porous body, a foam, a nonwoven body.
  • the negative electrode active material coating unit includes a negative electrode active material, a binder and a conductive material.
  • a compound capable of reversible intercalation and deintercalation of lithium may be used.
  • Specific examples include carbonaceous materials such as artificial graphite, natural graphite, graphitized carbon fibers, and amorphous carbon;
  • Metallic compounds capable of alloying with lithium such as Si, Al, Sn, Pb, Zn, Bi, In, Mg, Ga, Cd, Si alloys, Sn alloys or Al alloys; Or composites comprising metallic compounds and carbonaceous materials;
  • silicon-based compounds such as SiOx (0 ⁇ x ⁇ 2), and one or more of these may be used.
  • a metal lithium thin film may be used as the anode active material.
  • the binder serves to improve adhesion between the negative electrode active material particles and adhesion between the negative electrode active material and the negative electrode current collector.
  • Specific examples include polyvinylidene fluoride (PVDF), polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, Polyethylene, polypropylene, ethylene-propylene-diene polymer (EPDM), sulfonated-EPDM, ethylene- (meth) acrylic acid copolymer, styrene-butadiene rubber, fluorine rubber or various copolymers thereof and the like. One kind alone or a mixture of two or more kinds may be used.
  • Such a binder may be included in 1% by weight to 30% by weight based on the total weight of the negative electrode active material coating portion.
  • the conductive material is used to impart conductivity to the electrode, and in the battery constituted, any conductive material can be used without particular limitation as long as it has electronic conductivity without causing chemical change.
  • any conductive material can be used without particular limitation as long as it has electronic conductivity without causing chemical change.
  • Specific examples thereof include graphite such as natural graphite and artificial graphite; Carbon-based materials such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, summer black and carbon fiber; Metal powder or metal fibers such as copper, nickel, aluminum, and silver; Conductive whiskeys such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Or conductive polymers such as polyphenylene derivatives, and the like, or a mixture of two or more kinds thereof may be used.
  • the conductive material may be included in an amount of 1% by weight to 30% by weight based on the total weight of the negative electrode active material coating portion.
  • the positive electrode plate includes a positive electrode current collector and a positive electrode active material coating portion coated with a positive electrode active material on at least one surface, preferably both surfaces of the positive electrode current collector.
  • the positive electrode current collector is not particularly limited as long as it is conductive without causing chemical change in the battery.
  • the surface of stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum or stainless steel Surface treated with carbon, nickel, titanium, silver, or the like may be used.
  • the positive electrode current collector may have a thickness of 3 ⁇ m to 500 ⁇ m, and may form fine irregularities on the surface of the positive electrode current collector to increase the adhesion of the positive electrode active material.
  • it can be used in various forms, such as a film, a sheet, a foil, a net, a porous body, a foam, a nonwoven body.
  • the positive electrode active material coating part may be coated on both sides of the positive electrode current collector, and the active material may be coated on only one surface of the positive electrode current collector, but considering the capacity of the secondary battery, the positive electrode active material may be coated on both sides. Coated may be more preferred.
  • the positive electrode plate may include insulating tapes at both ends of the positive electrode plate flat coating part, that is, at the beginning and the end of the positive electrode plate flat coating part, in order to prevent a short circuit from occurring during the charging and discharging process.
  • the insulating tape may be the same as described above with respect to the negative electrode plate.
  • the positive electrode tab may be attached to be electrically conductive by welding such as laser welding, ultrasonic welding, resistance welding, or a conductive adhesive, and an insulating tape may be attached to the positive electrode tab to prevent a short circuit between electrodes.
  • the unit cell 10 includes electrode tabs extending from the electrode assembly, and electrode leads welded to the electrode tabs.
  • the electrode terminal may be located in one or both directions of the unit cell.
  • the electrode terminals may be electrically connected in series or in parallel on one or two sides of the battery module.
  • the separator interposed between the positive electrode plate and the negative electrode plate may be an insulating thin film having high ion permeability and mechanical strength.
  • the separator is a porous polymer film, for example, a porous polymer film made of a polyolefin-based polymer such as ethylene homopolymer, propylene homopolymer, ethylene / butene copolymer, ethylene / hexene copolymer and ethylene / methacrylate copolymer Or a laminate structure of two or more thereof.
  • the separator may be a porous nonwoven fabric, for example, a non-woven fabric made of glass fiber or polyethylene terephthalate fiber having a high melting point.
  • a gel polymer electrolyte may be coated on the separator to increase the stability of the battery.
  • Representative examples of such gel polymers include polyethylene oxide, polyvinylidene fluoride or polyacrylonitrile.
  • the solid electrolyte may also serve as a separator.
  • the pores included in the separation membrane may have a pore diameter of 0.01 ⁇ m to 10 ⁇ m.
  • the separator may be one having a thickness of 5 ⁇ m to 300 ⁇ m.
  • the separator is preferably extended longer than the end of the negative electrode plate to block the cathode electrode even if the separator shrinks by heat.
  • the separator may be extended by at least 5mm from the cathode end.
  • a battery pack including the battery module is provided.
  • the battery pack includes a power tool; Electric vehicles including electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs); Or it can be used as a power source for any one or more of the system for power storage.
  • Electric vehicles including electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs); Or it can be used as a power source for any one or more of the system for power storage.
  • a flat Al cooling plate having a structure as shown in FIG. 1 was prepared (thickness a1 of the first plate material: 0.5 mm, thickness b1 of the second plate material: 0.5 mm, height c1 of the first rib). ): 0.3 mm, height of the second rib (d1): 0.3 mm, separation distance between the end of the first rib and the second rib (e1): 0.2 mm, width of the first and second ribs: 0.2 mm, respectively Separation distance between one rib and the second rib: 0.2 mm, width of the partition: 0.5 mm, thickness of the cooling plate: 1.7 mm, opening ratio: 80% by volume).
  • a bicell stack-folding electrode assembly is housed in a cell packaging material such that electrode terminals in each electrode assembly are formed in one direction, and after injecting 1M LiPF 6 carbonate electrolyte, the cell packaging material 29 pouch-type unit cells were manufactured by thermal fusion of the outer circumferential surface.
  • the 29 unit cells were stored one by one in each space to be in close contact with the cooling plate.
  • the electrode terminals of the 29 unit cells were accommodated in the same direction so as to protrude only from one side of the battery module.
  • one terminal assembly was manufactured so that the connection between the stored unit cells and the unit cell and the external terminal were made at once.
  • the terminal assembly is formed with a terminal hole into which the electrode terminals of all the unit cells can be inserted, and the electrode terminals of the inserted unit cells are connected in series through the fastening with the bus bars already configured in the terminal assembly. Is also connected to the input and output terminals protruding out of the terminal assembly.
  • the terminal assembly was coupled to a portion where the electrode terminals were formed, and then welded to the case body to manufacture a battery module having a completely sealed module case.
  • a battery module was manufactured in the same manner as in the above embodiment except that the cooling plate was not used in the above embodiment.
  • a battery module was manufactured by the same method as in the above example except that a flat aluminum cooling plate (thickness: 1.7 mm) was used instead of the cooling plate in the above embodiment.
  • the heat dissipation effect in the battery module was evaluated for the cooling plate of the example.
  • the battery module (29 stack 42Ah class battery) was manufactured by stacking 29 unit cells having a bicell structure through the cooling plates of Example and Comparative Example 2, respectively.
  • the produced battery module was charged at 1C to 4.2V / 38mA at constant current / constant voltage (CC / CV) conditions at 25 ° C., and then discharged at 1C to 3.0V under constant current (CC) conditions. Except for changing the discharge C-rate in various ways as shown in Table 1, was carried out in the same manner as above to observe whether the temperature rise. The results are shown in Table 1 below.
  • the cooling plate of the above example was evaluated for the effect of preventing heat accumulation phenomenon occurring during a long-term cycle test of a high capacity battery cell.
  • the battery module (29 stack 42Ah class battery) was manufactured by stacking 29 unit cells having a bicell structure through the cooling plates of Example and Comparative Example 2, respectively.
  • the produced battery module was charged at 1C to 4.2V / 38mA at constant current / constant voltage (CC / CV) conditions at 45 ° C., and then discharged at 1C to 3.0V under constant current (CC) conditions. This cycle was repeated for 200 cycles.
  • the battery module manufactured by the same method as described above was charged at 2C to 4.2V / 38mA at constant current / constant voltage (CC / CV) conditions at 45 ° C, and then discharged at 2C to 3.0V under constant current (CC) conditions. . This cycle was repeated for 200 cycles. The results are shown in FIG.
  • the cooling plate of the example exhibited a heat accumulation phenomenon that was relaxed compared to the cooling plate of Comparative Example 2 due to the suppression of temperature rise during discharge and rapid cooling effect. From these results it can be seen that the application of the cooling plate according to the present invention can improve the cycle characteristics of the battery.
  • the diameter of the through hole formed in the cooling plate of the embodiment was 3 mm, which was smaller than the diameter of the through hole of Comparative Example 2 (4 mm), and in the unit cell adjacent to the cooling plate including the through hole, a unit in which penetration or deformation occurred.
  • the number of batteries decreased to three in the case of the example compared to Comparative Example 2 (four).
  • FIG. 8 is a diagram illustrating a nail penetration experiment when a flat plate cooling plate is installed.
  • FIG. 9 is a diagram illustrating a nail penetration experiment when a cooling plate according to an embodiment of the present invention is installed.
  • the conventional flat cooling plate P is a single-shaped plate having a full interior, deformation due to the thickness of the plate itself is large.
  • the cooling plate 20 of the dual structure according to the exemplary embodiment of the present invention is empty due to the presence of the cooling unit 21, deformation in the thickness direction may occur as much as empty space. Therefore, by applying the cooling plate 20 having a double hollow structure, the deformation of the plate due to the penetration of the nail T is reduced, and thus the deformation of the lower unit cell 10 is reduced, thereby shorting the short circuit of the unit cell 10. Can reduce accidents.
  • the above-described embodiment assumes that the first plate 20a and the second plate 20b are detachably coupled, but the deformation of the unit battery when the nail (or steel bar) penetrates. Since the effect of reducing the short circuit accident can be achieved only by the existence of the cooling part having the empty space shape, the first plate 20a and the second plate 20b are not necessarily separable.
  • first plate 20a and the second plate 20b may be detachably coupled for the convenience of assembly, but it is also possible to form one-piece.
  • another embodiment of the present invention is provided by inserting a heat absorbing material (not shown), which is a material capable of absorbing heat, into the cooling unit 21 formed in the cooling plate 20 of the present invention. It is possible. That is, the heat absorbing material may be provided in the cooling unit 21.
  • the heat absorbing material When the heat absorbing material is inserted into the cooling unit 21, the amount of heat absorbed by the cooling plate 20 from the unit cell 10 becomes larger. Therefore, when the heat absorbing material is placed in the cooling unit 21, the performance, safety, reliability, and lifespan of the battery may be further improved.
  • a gel material containing a large amount of moisture As a heat absorbing material, a gel material containing a large amount of moisture. Liquids that do not have a high flash point or flash point, such as silicone oil, can be used.
  • the capsule (not shown) is inserted into the cooling unit 21 formed in the cooling plate 20 of the present invention.
  • the inside of the capsule can be put into a material capable of phase change depending on the temperature.
  • a capsule may be provided in the cooling unit 21, and a phase change material may be contained in the capsule. And it is necessary to enter a material having a high heat capacity such as water as a phase changeable material.
  • the phase changeable material in the capsule sublimates from liquid to gas, where the phase change material absorbs large heat. Can be. Accordingly, the cooling plate 20 can effectively absorb heat from the unit cell 10.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

La présente invention concerne une plaque de refroidissement pour une batterie secondaire ; dans une plaque de refroidissement de type à panneau plat, une pluralité de parties de refroidissement sont formées en étant espacées les unes des autres dans la plaque de refroidissement le long de sa direction longitudinale, et une pluralité de nervures de renforcement sont formées dans des surfaces internes des parties de refroidissement ; un module de batterie secondaire muni de ladite plaque de refroidissement est également décrit. La plaque de refroidissement pour batterie secondaire de la présente invention permet une déformation minimale lorsque le module de batterie est pénétré par un choc externe et une stimulation. En conséquence, l'effet de déformation de la plaque de refroidissement sur la batterie de l'unité est réduit, l'apparition de courts-circuits dans la batterie de l'unité à l'intérieur du module de batterie est empêchée, et la stabilité de la batterie est ainsi améliorée. De plus, la chaleur générée pendant la charge/décharge est libérée de manière efficace, et, de ce fait, il est possible d'éviter le déclin de la capacité de la batterie, et la durée de vie et la fiabilité des performances de la batterie peuvent être améliorées.
PCT/KR2015/012048 2014-11-17 2015-11-10 Plaque de refroidissement pour batterie secondaire et module de batterie secondaire muni de celle-ci WO2016080696A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2017519302A JP6448069B2 (ja) 2014-11-17 2015-11-10 二次電池用冷却プレート及びこれを含む二次電池モジュール
EP15861814.0A EP3223357B1 (fr) 2014-11-17 2015-11-10 Module de batterie secondaire avec une plaque de refroidissement
US15/515,221 US10847850B2 (en) 2014-11-17 2015-11-10 Cooling plate for secondary battery and secondary battery module including the same

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20140160228 2014-11-17
KR10-2014-0160228 2014-11-17
KR10-2015-0154411 2015-11-04
KR1020150154411A KR101816974B1 (ko) 2014-11-17 2015-11-04 이차전지용 냉각 플레이트 및 이를 포함하는 이차전지 모듈

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EP3413379A1 (fr) * 2017-06-07 2018-12-12 Lithium Energy and Power GmbH & Co. KG Dispositif de securite pour une batterie
JP2019510346A (ja) * 2016-12-22 2019-04-11 中国▲鉱▼▲業▼大学 相変化材料による熱管理および空気による熱管理を組み合わせた階段式の電池熱管理システム
US20210234214A1 (en) * 2018-05-03 2021-07-29 Lawrence Livermore National Security, Llc Compact temperature control system and method for energy modules
US11862776B2 (en) 2022-02-21 2024-01-02 Contemporary Amperex Technology Co., Limited Battery, power consumption device, and method and device for producing battery

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KR102369355B1 (ko) * 2018-12-21 2022-02-28 주식회사 엘지에너지솔루션 이차전지용 이동형 온도측정기구 및 냉각팬을 포함하는 충방전 장치
CN109921114B (zh) * 2019-03-20 2021-03-16 昆山宝创新能源科技有限公司 车辆及其电池包的防护方法和装置
DE102019113603A1 (de) * 2019-05-22 2020-11-26 Lisa Dräxlmaier GmbH Kühlplatte für eine batterie eines kraftfahrzeugs und batterie für ein kraftfahrzeug mit einer kühlplatte
CN111477997B (zh) * 2020-03-25 2022-01-11 安徽沃博源科技有限公司 液冷板及液冷装置
CN111463519B (zh) * 2020-04-08 2022-11-22 重庆长安新能源汽车科技有限公司 一种电池缓冲隔热冷却板、动力电池包及汽车
CN113241485B (zh) * 2021-05-08 2022-05-06 傲普(上海)新能源有限公司 一种增加相变换热的电池包
CN113677169A (zh) * 2021-09-10 2021-11-19 新风光电子科技股份有限公司 一种分离式相变散热的逆变装置
CN116325314A (zh) * 2022-02-21 2023-06-23 宁德时代新能源科技股份有限公司 电池、用电设备、制备电池的方法和设备
KR20240117127A (ko) * 2022-02-21 2024-07-31 컨템포러리 엠퍼렉스 테크놀로지 씨오., 리미티드 전지 및 전기 장치
WO2023155622A1 (fr) * 2022-02-21 2023-08-24 宁德时代新能源科技股份有限公司 Batterie et dispositif électrique

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EP3413379A1 (fr) * 2017-06-07 2018-12-12 Lithium Energy and Power GmbH & Co. KG Dispositif de securite pour une batterie
US20210234214A1 (en) * 2018-05-03 2021-07-29 Lawrence Livermore National Security, Llc Compact temperature control system and method for energy modules
US11862776B2 (en) 2022-02-21 2024-01-02 Contemporary Amperex Technology Co., Limited Battery, power consumption device, and method and device for producing battery

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