WO2019013591A1 - Module de batteries - Google Patents

Module de batteries Download PDF

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Publication number
WO2019013591A1
WO2019013591A1 PCT/KR2018/007986 KR2018007986W WO2019013591A1 WO 2019013591 A1 WO2019013591 A1 WO 2019013591A1 KR 2018007986 W KR2018007986 W KR 2018007986W WO 2019013591 A1 WO2019013591 A1 WO 2019013591A1
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WO
WIPO (PCT)
Prior art keywords
welding
electrode lead
bus bar
electrode
electrode leads
Prior art date
Application number
PCT/KR2018/007986
Other languages
English (en)
Korean (ko)
Inventor
최항준
윤한종
이강일
Original Assignee
주식회사 엘지화학
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020180081313A external-priority patent/KR102144945B1/ko
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to CN201880005614.5A priority Critical patent/CN110140235B/zh
Priority to EP18832083.2A priority patent/EP3654411B1/fr
Priority to ES18832083T priority patent/ES2972804T3/es
Priority to PL18832083.2T priority patent/PL3654411T3/pl
Priority to US16/345,862 priority patent/US11011804B2/en
Priority to JP2019548854A priority patent/JP7027634B2/ja
Publication of WO2019013591A1 publication Critical patent/WO2019013591A1/fr

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/22—Spot welding
    • 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
    • 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
    • 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, and more particularly, to a battery module having improved weldability of an electrical connection structure, a battery pack including the battery module, and an automobile.
  • the secondary rechargeable batteries are nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries.
  • lithium secondary batteries have almost no memory effect compared to nickel- It is very popular because of its low self-discharge rate and high energy density.
  • the lithium secondary batteries mainly use a lithium-based oxide and a carbonaceous material as a cathode active material and an anode active material, respectively.
  • the lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate each coated with such a positive electrode active material and a negative electrode active material are disposed with a separator interposed therebetween, and an outer casing, that is, a battery case, for sealingly storing the electrode assembly together with the electrolyte solution.
  • a lithium secondary battery can be classified into a can type secondary battery in which an electrode assembly is embedded in a metal can, and a pouch type secondary battery in which an electrode assembly is embedded in a pouch of an aluminum laminate sheet, depending on the shape of the casing.
  • secondary batteries are widely used not only in small-sized devices such as portable electronic devices, but also in medium to large-sized devices such as automobiles and electric power storage devices.
  • carbon energy is getting depleted and the interest in the environment is increasing, attention is focused on hybrid cars and electric cars worldwide, including the US, Europe, Japan, and Korea.
  • the most important components in such hybrid vehicles and electric vehicles are battery packs that give drive power to vehicle motors. Since hybrid vehicles and electric vehicles can obtain the driving force of the vehicle through charging and discharging of the battery pack, the fuel efficiency is higher than that of the vehicle using only the engine, and the users are increasingly increasing in terms of not discharging or reducing pollutants. to be.
  • Most battery packs particularly medium- to large-sized battery packs such as hybrid cars, electric vehicles and Energy Storage Systems (ESS), include a plurality of secondary batteries, which are connected in series and / So that the output is improved.
  • pouch-type secondary batteries are widely used because they are easy to be stacked, light in weight, and can contain a large number of batteries in a middle- or large-sized battery pack.
  • the electrical connection between the secondary batteries is often constituted by a method of directly contacting the electrode leads with each other.
  • the electrode leads of the same polarity are connected to each other and the electrode leads of the other polarity are connected to each other in order to connect them in series.
  • the bus bar may be bonded to the electrode lead, particularly, to two or more electrode leads. At this time, the connection between the electrode lead and the bus bar is often made by welding.
  • FIG. 1 is a partial perspective view schematically showing a structure in which an electrode lead and a bus bar are welded to each other in a conventional battery module.
  • Fig. 2 is a cross-sectional view taken along the line A1-A1 'in Fig. 1, and is a diagram showing the welded part in a schematic form.
  • cracks when pores or cracks are generated in the welded portion, cracks can be rapidly grown due to external vibration or impact. For example, when a crack occurs at a point A3 in Fig. 1, such a crack can be rapidly enlarged along the direction of the arrow A4, that is, along the length direction of the welding line, by vibration or impact.
  • the direction in which the external force is applied may be a direction perpendicular to the welding line (left and right direction in FIG. 1).
  • the cross-sectional area of the welded portion in the direction in which the external force is applied is low, .
  • cracks often start from the end of the welding line. These cracks may continue to grow along the weld line.
  • the welding strength at any one end can be reduced.
  • welding may be performed in such a manner that the laser is continuously irradiated from one end of the welding line to the other end. In the portion where welding starts, sufficient heat is not transferred to the electrode lead, There may be a problem of falling.
  • the weldability is poor, and particularly, it is vulnerable to vibration and impact. Furthermore, when the battery module is applied to an automobile, it may be exposed to a large and large vibration or shock, and therefore it is necessary that the weldability for the connection of the electrode lead and / or the bus bar is stably secured.
  • a battery module comprising: a cell assembly including a plurality of secondary cells stacked in at least one direction and each having an electrode lead, the plurality of secondary cells being electrically connected through the electrode leads; And at least one electrode lead formed of an electrically conductive material and electrically connected to the electrode lead of the secondary battery, wherein at least one of the electrode leads includes at least one of the other electrode leads and the contacted bus bars, As shown in Fig.
  • the welding spot may be configured to have a plurality of spiral welding lines.
  • the welding spot may be configured such that the plurality of welding lines have the same rotational direction as each other, and at least a part of one welding line is inserted between the other welding lines.
  • the welding spot may be configured such that a straight line connecting each inner end of the plurality of welding lines and a straight line connecting the respective outer ends are parallel to each other.
  • the welding spot may be configured so that the inner ends of the plurality of welding lines are connected to each other.
  • a plurality of welding spots may be provided for one electrode lead.
  • a plurality of welding spots provided in one electrode lead can be configured so that the outer end thereof is positioned on one straight line.
  • the welding spot may be configured to weld a plurality of mutually stacked electrode leads and one bus bar.
  • the electrode lead may have a concave portion formed concavely inwardly, and the welding spot may be configured such that at least a part of the welding spot is located in the concave portion.
  • a battery pack including a battery module according to the present invention.
  • an automobile including the battery module according to the present invention.
  • the weldability between the electrode leads and / or between the electrode leads and the bus bar is improved, and the welding strength can be improved.
  • the welding area can be increased in the direction in which such force acts have. Therefore, according to this aspect of the present invention, tensile strength can be improved between the electrode leads and / or between the electrode leads and the bus bars.
  • the welding area increases between the electrode leads and / or between the electrode leads and the bus bar, so that the tensile strength of the welding portion can be improved.
  • the welding state of the electrical connection structure can be stably maintained.
  • FIG. 1 is a partial perspective view schematically showing a structure in which an electrode lead and a bus bar are welded to each other in a conventional battery module.
  • Fig. 2 is a cross-sectional view taken along the line A1-A1 'in Fig. 1, and is a diagram showing the welded part in a schematic form.
  • FIG. 3 is a perspective view schematically showing a configuration of a battery module according to an embodiment of the present invention.
  • FIG. 4 is a front view of the configuration of a battery module according to an embodiment of the present invention.
  • FIG. 5 is a view schematically showing a configuration of a welding spot applied to an electrode lead of a battery module according to the present invention.
  • FIG. 6 is a diagram schematically illustrating a tornado shape of a welding spot according to another embodiment of the present invention.
  • FIG. 7 is a schematic representation of a tornado shape of a weld spot in accordance with another embodiment of the present invention.
  • FIG. 8 is a view schematically showing a configuration of a plurality of welding spots provided in an electrode lead in a battery module according to an embodiment of the present invention.
  • FIG. 9 is a cross-sectional view schematically showing a welding configuration between an electrode lead and a bus bar in a battery module according to an embodiment of the present invention.
  • FIG. 10 is a cross-sectional view schematically showing a welding configuration of an electrode lead and a bus bar according to another embodiment of the present invention.
  • FIG. 11 is a view schematically showing a configuration of a welding spot according to another embodiment of the present invention.
  • FIG. 12 is a view schematically showing the configuration of a welding spot according to another embodiment of the present invention.
  • FIG. 13 is a view schematically showing a configuration of a welding spot according to another embodiment of the present invention.
  • FIG. 14 is a view schematically showing a welding configuration of an electrode lead and a bus bar according to an embodiment of the present invention.
  • Fig. 15 is a view showing tensile strength measurement results for various examples and comparative samples of the present invention.
  • 16 is a view schematically showing a welding configuration of an electrode lead according to another embodiment of the present invention.
  • 17 is a view showing tensile strength measurement results of various other embodiments of the present invention.
  • FIG. 18 is an image of the peeling according to the tensile strength measurement according to one embodiment of the present invention.
  • Fig. 19 is an image of the peeling test according to the tensile strength measurement according to another embodiment of the present invention.
  • 20 is a view showing the interval between the electrode lead and the bus bar applied to various embodiments of the present invention and a comparative sample.
  • Fig. 21 is a diagram showing the result of defect measurement observed visually with respect to various examples and comparative samples of Fig. 20; Fig.
  • Fig. 22 is a view showing tensile strength measurement results for various examples and comparative samples of Fig. 20; Fig.
  • FIG. 23 is a view schematically showing a configuration of a plurality of welding spots provided in an electrode lead in a battery module according to another embodiment of the present invention.
  • FIG. 3 is a perspective view schematically showing a configuration of a battery module according to an embodiment of the present invention.
  • 4 is a front view of the configuration of a battery module according to an embodiment of the present invention.
  • the battery module according to the present invention may include a cell assembly 100 and a bus bar 200.
  • the cell assembly 100 may include a plurality of secondary batteries 110.
  • the cell assembly 100 may include a plurality of pouch-type secondary batteries as the secondary batteries 110.
  • the pouch-type secondary battery 110 may include an electrode assembly, an electrolyte, and a pouch exterior member.
  • the electrode assembly may be configured such that at least one positive electrode plate and at least one negative electrode plate are disposed with the separator interposed therebetween. More specifically, the electrode assembly can be divided into a winding type in which one positive electrode plate and one negative electrode plate are wound together with a separator, and a stacked type in which a plurality of positive electrode plates and a plurality of negative electrode plates are alternately stacked with a separator interposed therebetween .
  • the pouch exterior member may be configured in the form of an external insulating layer, a metal layer, and an internal adhesive layer. More specifically, such a pouch case is provided with a metal thin film (metal layer), such as an aluminum thin film, for protecting internal components such as an electrode assembly and an electrolytic solution, complementing the electrochemical properties of the electrode assembly and electrolyte, And can be configured to be included.
  • a metal thin film such as an aluminum thin film
  • An insulating layer, an inner adhesive layer In order to ensure electrical insulation between the internal components of the secondary battery 110 such as the electrode assembly and the electrolytic solution and other components outside the secondary battery 110, An insulating layer, an inner adhesive layer).
  • the pouch exterior member can be composed of two pouches, and at least one of them can be formed with a concave internal space.
  • the electrode assembly can be housed in the inner space of the pouch.
  • a sealing portion is provided on the outer circumferential surface of the two pouches, and these sealing portions are fusion-bonded to each other, so that the inner space accommodating the electrode assembly can be sealed.
  • the battery module according to one aspect of the present invention may employ various types of pouch-type secondary batteries known at the time of filing of the present invention. Therefore, detailed description of the internal structure of the secondary battery 110 provided in the cell assembly 100 will be omitted.
  • the plurality of pouch-shaped secondary batteries 110 may be stacked in at least one direction, for example, the lateral direction (Y-axis direction in the figure) as shown in the figure.
  • each of the pouch-shaped secondary batteries 110 has a shape erected in a vertical direction (Z-axis direction in the drawing) with respect to the sheet surface (XY plane in the figure), that is, a shape in which the large surface faces right and left, . ≪ / RTI >
  • each of the secondary batteries 110 can be arranged such that the large surfaces face each other.
  • the side where the electrode lead 111 is seen is referred to as the front side of the battery module. From the viewpoint of the front side, the upper, lower, left, right, front , And the back direction.
  • Each of the secondary batteries 110 included in the cell assembly 100 may include an electrode lead 111.
  • the electrode lead 111 includes a positive electrode lead and a negative electrode lead, and can function as an electrode terminal of the secondary battery 110.
  • the electrode leads 111 are formed in a plate-like shape and can protrude to the outside of the pouch outer casing.
  • the electrode leads of each secondary battery 110 are disposed in front of the cell assembly 100 (in the -X-axis direction in the drawing) from at least one of the front end portion and the rear end portion of the cell assembly 100, Or in the rear (in the + X-axis direction in the drawing).
  • the electrode lead 111 may be made of a metal such as aluminum or copper to function as a terminal of a battery.
  • the electrode leads 111 may be formed in various thicknesses.
  • the electrode lead 111 may have a thickness of 0.1 mm to 1 mm. More specifically, the electrode lead 111 may have a thickness of 0.2 mm to 0.6 mm.
  • the electrode leads 111 can be configured to have various widths.
  • the electrode lead 111 may be configured to have a width of 20 mm to 60 mm.
  • the thickness and the width of the electrode lead 111 may be variously configured according to the specification or the type of the battery or the battery pack.
  • the electrode leads 111 of the secondary battery 110 may be connected to each other to be electrically connected to each other.
  • a plurality of secondary batteries can be connected to each other in series or in parallel by direct contact of the electrode leads.
  • the plurality of secondary cells may be connected to each other in series or in parallel by indirectly connecting the electrode leads through the bus bar 200.
  • the bus bar 200 may be electrically connected to an electrode lead of a secondary battery in contact with an electrode lead of the secondary battery.
  • the bus bar 200 is electrically connected to two or more electrode leads, thereby electrically connecting the electrode leads to each other.
  • the bus bar 200 is directly connected to at least one of the electrode leads to measure electrical characteristics at the electrode lead side.
  • the bus bar 200 may sense voltage across one or more secondary batteries.
  • the bus bar 200 may be formed of an electrically conductive material to be electrically connected to the electrode lead 111 of the secondary battery.
  • the bus bar 200 may be made of a metal such as copper or aluminum.
  • the bus bar 200 may be formed in the form of a plate (plate) or rod similar to the electrode lead 111. At this time, the bus bar 200 may be formed to have a thicker thickness than the electrode lead 111.
  • the bus bar 200 may be configured to have a thickness of 0.3 mm to 4 mm.
  • a thickness of the bus bar 200 is 0.6 mm or less when the thickness of the electrode lead 111 is 0.2 mm to 0.4 mm.
  • Lt; RTI ID 0.0 > mm. ≪ / RTI >
  • the thickness of such a bus bar may be variously configured according to the specification or kind of the battery or the battery pack, and the present invention is not limited to the specific thickness of the bus bar.
  • the electrode leads 111 provided in each secondary battery 110 of the cell assembly 100 can be coupled and fixed to the bus bar 200.
  • the electrode lead 111 of the secondary battery included in the cell assembly 100 can be coupled and fixed to another electrode lead 111, that is, the electrode lead 111 of another secondary battery provided in the cell assembly 100 have.
  • between the electrode lead 111 and the bus bar 200 and / or between the electrode lead 111 and the electrode lead 111 can be fixed to each other by welding.
  • the welding at this time can be performed by a laser welding method in which the laser is irradiated and the workpiece is welded. That is, the space between the electrode leads 111 and the electrode leads 111 and / or between the electrode leads 111 and the bus bars 200 may be laser-welded.
  • the electrode leads 111 of the plurality of secondary batteries included in the cell assembly 100 may be in contact with the other electrode leads 111 or in contact with the bus bar 200.
  • At least one electrode lead 111 of the plurality of electrode leads provided in the cell assembly 100 is welded to at least one of the other electrode leads 111 and the contacted bus bars 200, They can be fixed to each other by the spots W.
  • the electrode leads 111 when two or more electrode leads 111 are laminated in face-to-face contact with each other, the electrode leads 111 which are in contact with each other can be fixedly coupled to each other by the welding spot W.
  • the electrode lead 111 and the bus bar 200 can be coupled and fixed to each other by the welding spot W have.
  • the welding spot W at this time may be formed in a tornado shape. Such a tornado-shaped welding spot W configuration will be described in more detail with reference to Fig.
  • FIG. 5 is a view schematically showing a configuration of a welding spot applied to an electrode lead of a battery module according to the present invention.
  • FIG. 5 is an enlarged view of the portion B1 in FIG.
  • the welding spot W applied to the electrode lead may be configured in the form of a tornado.
  • the welding line is a path irradiated with a laser having an energy of a predetermined power or more, and the workpiece can be welded to each other around the welding line.
  • the welding line may be formed in a curved shape rather than a straight line, and moreover, the curved shape may be formed in a whirl-like shape. That is, the welding line may be configured such that at least a part of the welding line rotates in a clockwise or counterclockwise direction and moves from the outer side to the central side of the welding spot W. That is, the welding line may be configured to draw a circle whose diameter gradually decreases.
  • the welding line may be formed in such a manner that the laser irradiation path moves from the outside to the inside (center) direction or from the inside to the outside.
  • the welding spot W to be welded between the electrode lead and the electrode lead, and / or between the electrode lead and the bus bar can be configured in the form of a tornado.
  • welding strength between the electrode to be welded that is, between the electrode lead and the electrode lead, and / or between the electrode lead and the bus bar can be improved.
  • the welding portion can be formed uniformly and widely. Therefore, the welding portion can be stably maintained even in vibration or shock in various directions.
  • the welding spot W applied to the electrode lead 111 and / or the bus bar 200 may be configured to have a plurality of welding lines formed in a spiral shape. have.
  • one weld spot W may be configured with two weld lines, a first weld line denoted W1 and a second weld line denoted W2 .
  • the first welding line W1 and the second welding line W2 may have different outer ends. 5
  • the outer end o1 of the first welding line W1 indicated by o1 and the outer end of the second welding line W2 indicated by o2 are formed separately and at different positions Can be located.
  • a plurality of different spirals such as two spirals, are configured to form one tornado, that is, one welding spot.
  • the inner ends of the respective spirals can be located at different positions. 5
  • an inner end i1 of the first welding line W1 and an inner end i2 of the second welding line W2 are located at the center of the welding spot W
  • the two inner ends i1 and i2 may be configured as separate from each other. In this case, it can be said that the first welding line W1 and the second welding line W2 are separated from each other without being connected to each other.
  • the welding spot W may be configured such that a plurality of welding lines constituting the welding spot W have the same rotational direction.
  • the two welding lines that is, the first welding line W1 and the second welding line W2 may both be configured to rotate so that the inside direction is clockwise have.
  • At this time, at least a part of one welding line can be configured in a form inserted between different welding lines.
  • the first welding line W1 may be configured such that a portion thereof is inserted between the second welding lines W2.
  • the welding configuration in which the plurality of spiral-shaped welding lines form one welding spot W, that is, one tornado, one welding line in the form of a spiral forms a welding spot
  • the welding performance can be further improved as compared with the welding configuration comprising
  • the welding strength of the outer or inner side of the welding spot may be somewhat lower .
  • a laser irradiation path is formed from the outer end o1 to the inner end i1 of the first welding line W1
  • the welding depth can not be sufficiently formed and the welding strength may be lower than the inside end i1.
  • a welding spot W configured in the form of a tornado
  • the interval of each welding line the diameter of the welding spot, the number of turns of the spiral, the distance between the inner ends, Or the material, the number and shape of the weld spots, and the like.
  • the spacing of the weld lines constituting the tornado may be comprised between 0.002 mm and 0.006 mm. More specifically, the distance between the first welding line W1 and the second welding line W2 may be comprised between 0.003 mm and 0.004 mm.
  • the diameter of the weld spot such as the maximum width of the tornado, may be comprised between 1.5 mm and 3 mm. 5
  • the distance between the outer end o1 of the first welding line W1 and the outer end o2 of the second welding line W2 may be comprised between 2.0 mm and 2.5 mm .
  • the medial end-to-end distance in one tornado may be comprised between 0.15 mm and 0.25 mm. More specifically, in the configuration of Fig. 5, the distance between the inner end i1 of the first welding line W1 and the inner end i2 of the second welding line W2 may be 0.2 mm. According to such a configuration, it is possible to prevent a crack from being generated in the welded portion due to over-welding in the vicinity of the inner end portion or deterioration of the welding force due to the weak welding.
  • At least some of the parameters may be configured to be dependent on the setting values of the other parameters.
  • the spacing of the weld lines may be 0.0035 mm or more and 0.0045 mm or less.
  • the interval of the welding line at this time may be 0.004 mm.
  • the welding strength may be lowered due to over-welding.
  • the interval of the welding line is 0.005 mm, weak welding phenomenon may occur.
  • the interval of the welding line may be 0.0025 mm or more and 0.0035 mm or less.
  • the interval of the welding line at this time may be 0.003 mm. If, in such a diameter tornado configuration, the spacing of the weld lines is 0.004 mm, there may be a bus bar weld failure due to weak welding. On the contrary, in the case of a tornado configuration having such a diameter, when the interval of the welding lines is 0.002 mm, the welding strength may be lowered due to over-contact.
  • the thicknesses of the two lines are different from each other. However, It does not mean that the weld thickness of the two lines should be different.
  • each of the outer ends, i.e., the plurality of outer ends, of the plurality of welding lines are positioned opposite to each other with respect to one center line Lt; / RTI >
  • the weld spot can be divided into four quadrants based on the center point p of the weld spot W.
  • the center point p of the weld spot W is a point located at the center of the weld spot W, for example, the distance between o1 and o2, which is the outer end of the two weld lines, It is the center point of the circle.
  • two straight lines perpendicular to each other can be drawn, passing through the center point p of the weld spot W. For example, a straight line passing through the center point p in parallel with the Y axis in Fig.
  • a region located at the right upper end by the two straight lines c11 and c12 is referred to as a first quadrant Q1
  • a region located at the upper left end is referred to as a second quadrant Q2
  • the region located at the lower left corner is referred to as the third quadrant Q3
  • the region located at the lower right corner may be referred to as the fourth quadrant Q4.
  • the outer end o1 of the first welding line W1 and the outer end o2 of the second welding line W2 are located in different quadrants . ≪ / RTI >
  • the outer end o1 of the first welding line W1 and the outer end o2 of the second welding line W2 may be configured to be located in quadrants that are not adjacent but opposite to each other.
  • the outer end o1 of the first welding line W1 when the outer end o1 of the first welding line W1 is located in the third quadrant Q3, the outer end o2 of the second welding line W2 is located at the second quadrant Q3, Can be configured to be located in the first quadrant (Q1), which is not adjacent to the third quadrant but located on the opposite side from each other. If one of the outer ends of the two welding lines W1, W2, such as o1, is located at the straight line c12, the other outer end, such as o2, may also be located on the straight line c12. However, in this case, the two outer ends o1 and o2 may be located on opposite sides with respect to the straight line c11.
  • the present invention it is possible to further improve the welding strength of the tornado-shaped welding spot W.
  • the fatigue that may occur in the vicinity of the end of one or more weld lines may be distributed rather than being concentrated in a particular portion, thereby further improving the welding performance.
  • the welding spot W may be configured such that a straight line connecting each inner end of the plurality of welding lines and a straight line connecting the respective outer ends are parallel to each other. This will be described in more detail with reference to FIG.
  • FIG. 6 is a diagram schematically illustrating a tornado shape of a welding spot according to another embodiment of the present invention.
  • FIG. 6 is another implementation that can be applied to the portion B1 of FIG.
  • FIG. 6 is another implementation that can be applied to the portion B1 of FIG.
  • the straight line connecting the outer end o1 of the first welding line W1 and the outer end o2 of the second welding line W2 may be c2.
  • the straight line connecting the inner end i1 of the first welding line W1 and the inner end i2 of the second welding line W2 may also be c2.
  • the angle formed by the straight line connecting the outer ends o1 and o2 of the plurality of welding lines and the straight line connecting the inner ends i1 and i2 of the plurality of welding lines is 0, and both straight lines are parallel to each other Lt; / RTI >
  • the straight line connecting the outer ends o1, o2 to the plurality of welding lines and the straight line connecting the inner ends i1, i2 may be the same straight line c2. That is, the tornado can be configured such that both the outer end and the inner end of the plurality of welding lines are located on one straight line.
  • the welding performance can be further improved.
  • the straight line connecting between the outside end and the inside end of the tornado welding spot W is formed vertically in the direction in which the tensile proceeds, the fatigue of the end portion may be lowered.
  • the tensile is mainly formed in the left-right direction
  • the straight lines connecting the outer end and the inner end of the weld spot W are formed in the vertical direction, The stress exerted on the user can be mitigated.
  • each welding line is irradiated with a laser beam in the inner- Or by moving the laser irradiation path from the inner end to the outer end direction.
  • the first welding line W1 and the second welding line W2 are formed in such a manner that the laser is irradiated in the inner end direction from the outer end portion, or in the outer end direction from the inner end portion .
  • the welding line relatively formed first is formed in a form in which the laser is irradiated in the direction from the outer end to the inner end
  • the welding line formed relatively late can be configured in a form in which the laser is irradiated from the inner end to the outer end have.
  • the first welding line W1 is formed prior to the second welding line W2, the first welding line W1 is located at the outer end o1 And the laser irradiation path is moved in the direction of the inner end portion i1.
  • the second welding line W2 may be configured such that the laser irradiation path is moved from the inner end i2 to the outer end o2 as indicated by an arrow d2.
  • the laser irradiation for forming the second welding line W2 is started adjacent to the portion where the laser irradiation for forming the first welding line W1 ends,
  • the laser irradiation time for forming the first welding line W1 and the second welding line W2 can be shortened and the processability can be improved.
  • the welding spot may be configured so that the inner ends of the plurality of welding lines are connected to each other. This will be described in more detail with reference to FIG.
  • FIG. 7 is a schematic representation of a tornado shape of a weld spot in accordance with another embodiment of the present invention.
  • FIG. 7 may be another implementation configuration that may be applied to the portion B1 of FIG.
  • two welding lines W1 and W2 formed in a spiral shape are provided to form one tornado, and two tornadoes can be connected to each other at their inner ends, such as a portion indicated by B4.
  • the first welding line W1 and the second welding line W2 are each formed in a spiral shape and have different outer ends o1 and o2, And can be configured in a connected form.
  • a plurality of the welding spots W are provided for one electrode lead 111.
  • the electrode leads 111 exposed to the outside are located at the rear of the other electrode leads and / or the bus bar 200 and the plurality of welding spots As shown in Fig.
  • the plurality of welding spots W are formed in a tornado shape as described above, and can be arranged to be spaced apart from each other by a predetermined distance.
  • a plurality of welding spots W with respect to one electrode lead can be arranged in the vertical direction (Z-axis direction in the figure). More specifically, when a plurality of secondary batteries are arranged in the lateral direction (the Y-axis direction in the figure), the electrode leads of each secondary battery can be mutually contacted in a laminated form in the front-rear direction . At this time, the contact portion between the electrode lead and the electrode lead and / or between the electrode lead and the bus bar is formed in the vertical direction (Z-axis direction in the figure) and the short side is formed in the horizontal direction , Which is substantially rectangular in shape.
  • the plurality of welding spots may be arranged in the long-side direction, that is, in the vertical direction, in such a rectangular contact portion. That is, the welding spots may be arranged to be spaced a predetermined distance along the longitudinal direction of the front exposed portion of the electrode lead.
  • each of the welding spots is formed in a tornado shape, and not only is the welding performance excellent as it is, but also a plurality of welding spots are spaced apart from each other by a predetermined distance, so that the weldability can be more stably maintained. That is, since a plurality of welding spots are separated from each other, even if a crack or the like occurs in one welding spot W, such a crack is difficult to grow up to another welding spot W. Therefore, the welding state of the electrode leads can be stably maintained. Furthermore, even if the battery module is frequently exposed to vibration or impact, it is possible to prevent the crack from continuing to grow due to such vibration or impact, thereby preventing the occurrence of defective electrical connection of the electrode leads.
  • the applied load is distributed to a plurality of welding spots, so that the welding state of each welding spot can be more stably maintained.
  • the direction in which the force is mainly applied by impact, vibration (Y-axis direction in the figure) that is an arrangement direction.
  • the welding spots are arranged in the vertical direction (the Z-axis direction in the figure) with respect to one electrode lead as in the above-described configuration, a plurality of welding spots are arranged in a direction substantially perpendicular to the direction in which the force is applied.
  • the welding state of a plurality of welding spots with respect to an external force can be more stably maintained.
  • the plurality of welding spots provided in one electrode lead can be configured such that the outer end is located on one straight line. This will be described in more detail with reference to Fig.
  • FIG. 8 is a view schematically showing a configuration of a plurality of welding spots provided in an electrode lead in a battery module according to an embodiment of the present invention.
  • FIG. 8 is an example of an enlarged configuration for the portion B2 in FIG.
  • a large number of the welding spots W1 may be formed on the electrode leads in the vertical direction (the Z-axis direction in the figure).
  • the welding spots located at the uppermost position are referred to as a first welding spot Wa and the second welding spot Wb and the third welding spot Wc are sequentially referred to as a downward direction.
  • these three weld spots can each be configured in the form of a tornado consisting of two spirals, i.e. two weld lines.
  • each outer end, the first welding line Wc1 of the third welding spot, and the outer end of the second welding line Wc2 may all be configured to lie on one straight line labeled c4. That is, in this case, the six outer ends provided in the three welding spots can be configured to be all located on the same straight line.
  • the welding power of the workpieces by a plurality of welding spots can be further improved.
  • the force due to vibration or impact that is, the tensile force can be generated in the left-right direction.
  • the weld strength is weakened by the fatigue formed at the outer end Prevention or reduction.
  • the welding spot W may be configured to be welded between the electrode lead and the electrode lead, and / or between the electrode lead and the bus bar, as described above.
  • the welding spot W may be configured to weld a plurality of electrode leads and a bus bar together. This will be described in more detail with reference to FIG.
  • FIG. 9 is a cross-sectional view schematically showing a welding configuration between an electrode lead and a bus bar in a battery module according to an embodiment of the present invention.
  • FIG. 9 is an example of a sectional configuration taken along line B3-B3 'in FIG. In Fig. 9, for convenience of explanation, only a part of the electrode lead and a bus bar are shown.
  • a plurality of electrode leads that is, two electrode leads 111 are overlapped with each other in the left-right direction (Y-axis direction in the figure) (Upper surface in Fig. 9).
  • the two electrode leads 111 and one bus bar 200 are laminated in the front-rear direction (X-axis direction in the drawing).
  • the two electrode leads 111 and one bus bar 200 stacked one upon the other can be welded by one or more welding spots W. 3 and 4, two mutually stacked electrode leads 111 and one bus bar 200 are welded together by a plurality, such as six to eight weld spots W. [ .
  • each welding spot may have a first welding line W1 and a second welding line W2, as shown in Fig. 9, wherein each of the two welding lines may be formed in a spiral shape .
  • each weld spot may be configured in any one of the weld spot shapes shown in FIGS. 5-8. Therefore, in one cross section of the configuration in which the two electrode leads and the bus bar are combined, as shown in Fig. 9, a welding portion by a plurality of welding lines can be formed.
  • the plurality of electrode leads 111 are made of the same material, and the bus bar 200 may be made of a material different from the electrode leads.
  • the two electrode leads 111 may be made of aluminum and one bus bar 200 may be made of copper.
  • a plurality of secondary batteries are electrically connected in parallel, such a configuration may be provided.
  • the electrode leads and the bus bars which are mutually coupled and fixed to each other, are made of different materials, it is preferable that they are welded to each other by one or more welding spots formed in a tornado shape as in the present invention.
  • the weldability between a plurality of electrode leads and the bus bar can be stably secured.
  • the material of the electrode lead and the bus bar may be made of various materials according to various factors such as the type of the battery, the battery pack, and the characteristics of the device to which the battery pack is applied.
  • the two electrode leads that is, the positive electrode lead and the negative electrode lead, may be made of different materials.
  • one electrode lead and the bus bar may be made of the same material.
  • both of the two electrode leads and the bus bar may be made of the same material.
  • FIG. 9 two electrode leads and one bus bar are shown as being welded to each other. However, this is merely an example, and three or more electrode leads and one bus bar may be welded together . Also, at this time, a welding spot of a tornado shape as described above can be applied.
  • the electrode lead has a recess formed inwardly concave, and the welding spot may be configured to be positioned at least partially in the recess. This will be described in more detail with reference to FIG.
  • FIG. 10 is a cross-sectional view schematically showing a welding configuration of an electrode lead and a bus bar according to another embodiment of the present invention.
  • Fig. 10 for convenience of explanation, only a part of the electrode lead and the bus bar are shown.
  • two electrode leads 111 may be laminated and welded on the front surface (upper surface in FIG. 10) of the bus bar 200 by approaching from both sides with respect to one bus bar 200.
  • the two electrode leads 111 may each have a concave portion formed in a recessed shape in the inner direction (+ X-axis direction in Fig. 10) as indicated by G1 in Fig.
  • the inward direction refers to a direction toward the center of the battery module or the secondary battery, and may be a direction opposite to a direction in which the electrode leads protrude from the secondary battery body.
  • each electrode lead 111 extends upward (in the -X-axis direction in the drawing) and then bent in the horizontal direction (Y-axis direction) , It may be configured such that it is bent in the horizontal direction to form a concave portion and the end portion is bent upward again.
  • all or a part of the welding spot W may be located in the concave portion G1 formed by the bending of the electrode lead. That is, as shown in FIG. 10, the welding spot W may be located at a portion formed concavely in the two electrode leads 111.
  • the bonding force between the electrode leads 111 can be further improved. That is, not only the two electrode leads 111 are fixed to each other by the welding spot W, but also the mechanical coupling strength can be further improved by the coupling between the recesses G1. That is, when the concave portion is formed in the electrode lead located relatively forward (the upper portion in Fig. 10), a convex portion may be formed on the rear side of the electrode lead. The convex portion can be inserted into the concave portion of the electrode lead located further behind. Therefore, by this insertion between the electrode leads, the bonding force between the electrode leads can be further improved.
  • the tensile force applied to the weld spot W can be reduced by the concave portion G1.
  • the concave portion G1 formed in the electrode lead can buffer the lateral force applied to the electrode lead . Therefore, such a force can be reduced and transmitted to the welding spot W formed in the concave portion G1 without being transmitted.
  • the positions of the electrode leads and the positions of the welding spots can be easily grasped and guided by the concave portion G1, the bonding between the electrode leads and the welding process can be performed more smoothly.
  • one tornado that is, one welding spot is formed by two welding lines formed in a helical form.
  • three or more welding lines constitute one tornado A welding spot can be constructed.
  • FIG. 11 is a view schematically showing a configuration of a welding spot according to another embodiment of the present invention.
  • one tornado i.e., one weld spot W
  • the three welding lines w1, w2 and w3 may have a spiral shape from the outer end to the inner end, respectively.
  • the welding lines constituting the tornado are formed in a spiral shape from the outer end to the inner end, but the present invention is not necessarily limited to these embodiments.
  • FIG. 12 is a view schematically showing the configuration of a welding spot according to another embodiment of the present invention.
  • each welding line may be formed in a shape other than a complete spiral as a whole.
  • the outer end of the first welding line W1 and the outer end of the second welding line W2 can be formed in a bent form, such as a portion denoted by e1 and e2 . Further, at this time, the bent end portions of the first welding line W1 and the second welding line W2 may be formed in a straight line shape.
  • the restraining force against crack growth can be increased. Further, through the bending configuration of such a welding line, the fatigue applied to the distal end of the welding line can be reduced.
  • FIG. 13 is a view schematically showing a configuration of a welding spot according to another embodiment of the present invention.
  • each welding spot formed in a tornado shape is configured such that the width in the direction of arrangement of the welding spots is shorter than the width in the direction orthogonal thereto .
  • the width may be the distance between welding lines located at the outermost part of the welding spot.
  • the width of the weld spot may be the maximum distance of the straight line distance between the outermost weld lines of the weld spot.
  • each welding spot W when two or more welding spots W are arranged in the vertical direction (the Z-axis direction in the figure), the vertical length of each welding spot is denoted by f1, and the horizontal direction of each welding spot Axial direction) width is f2, the tornado of each welding spot can be configured in such a manner that f2 is larger than f1. In this case, it can be said that each welding spot is formed in an approximately elliptic shape.
  • the battery module according to the present invention may further include a module case and the like in addition to the cell assembly 100 and the bus bar.
  • the module case may have an empty space formed therein, and may be configured to accommodate various components such as the cell assembly 100 and the bus bar in the empty space.
  • the battery module according to the present invention may further include various components of the battery module known at the time of filing of the present invention.
  • the battery pack according to the present invention may include at least one battery module according to the present invention.
  • the battery pack according to the present invention may include a pack case for storing the battery module, various devices for controlling charge and discharge of the battery module, such as a BMS (Battery Management System), a current sensor, . ≪ / RTI >
  • the battery module according to the present invention can be applied to an automobile such as an electric car or a hybrid car. That is, the automobile according to the present invention may include a battery module according to the present invention. Particularly, in the case of the battery module according to the present invention, the electrical connection state by the welding of the electrode lead 111 and / or the bus bar can be stably maintained even in case of impact or vibration. Therefore, in the case of a vehicle to which such a battery module is applied, the safety can be greatly improved.
  • the positive electrode leads of all the samples of the embodiment are made of aluminum and have a thickness of 0.2 mm
  • the negative electrode lead is made of copper and has a thickness of 0.2 mm
  • the bus bar is made of copper and has a thickness of 0.6 mm Respectively.
  • each welding spot was configured in the form of a tornado as shown in Fig.
  • the outer diameter (longest width) of the tornado was about 3 mm
  • the number of tornadoes was 6
  • the distance between the tornados was 3.4 mm
  • the distance between the welding lines was 0.004 mm.
  • the laser output was 1.5 kW and the speed was 100 mm / s.
  • Electrode leads and bus bars having the same material and shape as those of Examples 1 to 3, they were laminated in the same manner as in Examples 1 to 3. Then, the two electrode leads and the bus bar were welded together. At this time, the welding configurations were made as shown in FIG. 1, so that the samples of Comparative Examples 1 to 3 were prepared.
  • the total length of each welding line was set to 35 mm, and the interval between the welding lines was set to 1.2 mm.
  • the laser welding equipment of Miyachi Corporation was used for welding between the two electrode leads and the bus bar.
  • the laser output was 1.5 kW and the speed was 95 mm / s.
  • the lengths of the laser welding lines in the samples of Comparative Examples 1 to 3 were substantially similar to the total length of the laser welded portions in the samples of Examples 1 to 3.
  • the electrode leads and the bus bars in contact with the electrode leads stacked in the center were pulled in directions opposite to each other.
  • the right electrode lead 111 stacked at the center pulls in the right direction
  • the bus bar 200 at the lowermost position pulls in the left direction.
  • the measurement results are shown in Fig. 15 as Examples 1 to 3 and Comparative Examples 1 to 3.
  • the tensile strength was 46.484 kgf to 48.935 kgf, and the average tensile strength was 47.530 kgf.
  • the base material strength is 57.270 kgf, where the tensile strength measurement value corresponds to about 82.99% of the base material strength.
  • the tensile strength was 37.756 kgf to 41.972 kgf, and the average tensile strength was 40.371 kgf.
  • the base material strength is 57.270 kgf, it is about 70.49% of the base material strength.
  • Samples of Examples 4 to 6 were prepared by varying only the material and / or thickness of the electrode lead and the bus bar with respect to the overall configuration of the samples of Examples 1 to 3, particularly the welding configuration.
  • both the positive electrode lead and the negative electrode lead were made of aluminum and had a thickness of 0.4 mm.
  • the bus bar is made of copper and has a thickness of 3.0 mm.
  • each welding spot is configured in a tornado shape having only one spiral welding line as shown in FIG.
  • the diameter, the number of weld spots, the interval between weld spots, and the interval between weld lines were configured in the same manner as in Examples 4 to 6, that is, in Examples 1 to 3.
  • Example 10 Samples of Example 10 were prepared in the same form and the weld configuration as the samples of Examples 4 to 6 above.
  • Example 11 Samples of Example 11 were prepared in the same form and the weld configuration as the samples of Examples 7 to 9 above.
  • FIG. 18 is an image of the tensile strength measurement method according to Example 10 taken while the experiment is conducted
  • FIG. 19 is an image showing the tensile strength measurement method according to Example 11, to be.
  • each welding spot has a plurality of helical welding lines, that is, two helical welding lines, the welding portion is not easily peeled off , It can be seen that the welding can be done with a stronger strength. Thus, it can be seen that, in the case of a weld spot having two or more helical welding lines and formed with a tornado, the reliability of welding is further improved.
  • Samples of Examples 12 to 26 were prepared in such a manner that the overall configuration, particularly the welding configuration, of the samples of Examples 1 to 3 was substantially the same, but the materials and / or thicknesses of the electrode leads and bus bars were different.
  • the cathode lead was made of aluminum material to have a thickness of 0.4 mm, and the cathode lead was made of copper material to have a thickness of 0.2 mm.
  • the bus bar was made of copper and had a thickness of 3 mm.
  • the outer diameter of the tornado was about 3 mm
  • the number of tornadoes was 6, the distance between the tornadoes was 3.4 mm, and the distance between the welding lines was 0.004 mm.
  • the laser output was 1.5 kW and the speed was 100 mm / s.
  • the laser welding equipment used was FK-F6000-MM-CT of Miyachi Corporation as in the previous embodiments.
  • the gap between the electrode leads and the bus bar is different from each other. That is, for the 15 samples of Examples 12 to 26, the gap between the electrode leads stacked in the center directly in contact with the bus bar and the bus bars located thereunder was varied within a range of 0.04 mm to 0.6 mm In this state, the electrode lead and the bus bar were welded together. At this time, the distance between the electrode lead and the bus bar was maintained by interposing an intermediate member in a predetermined portion of the spaced space. The intervals between the leads and the bus bars in each of the examples of Examples 12 to 26 are as shown in the table of Fig.
  • the electrode leads and the bus bars having the same material and shape as those of Examples 12 to 26 were stacked in the same manner as in Examples 12 to 26. Then, the two electrode leads and the bus bar were welded together. At this time, the welding configuration was the same as that of Comparative Examples 1 to 3. That is, in the case of Comparative Examples 4 to 18, two electrode leads and a bus bar were welded through two straight line welding lines as shown in FIG. The total length of the welding line was 35 mm and the distance between the welding lines was 1.2 mm. The laser output was 1.5 kW and the speed was 95 mm / s. In this case as well, the laser welding equipment used FK-F6000-MM-CT of Miyagi Korea Co., Ltd. as in the comparative examples
  • the gap (gap) between the electrode lead and the bus bar is sequentially changed from each other. That is, also in the case of Comparative Examples 4 to 18, as shown in Fig. 20, the gap between each lead and the bus bar was made to be the same as the samples of Examples 12 to 26. In this way, linear samples were welded to each of the comparative samples having different intervals.
  • the tensile strength was measured within a range of about 175 kgf to 210 kgf for all 15 samples.
  • the tensile strength was measured within the range of about 175 kgf to 210 kgf only for Comparative Examples 4 to 9 in which the gap (gap between the electrode lead and the bus bar) was set to be as small as 0.24 mm or less.
  • the tensile strength was measured as low as less than 170 kgf.
  • the weldability can be stably secured even if a gap is formed between the electrode lead and the bus bar to some extent .
  • the electrode lead and the bus bar can not be welded properly even if only 0.32 mm between the electrode lead and the bus bar is widened.
  • the weldability can be stably maintained even in the state where the gap is 0.6 mm.
  • the bus bar can be stably maintained.
  • FIG. 23 is a view schematically showing a configuration of a plurality of welding spots provided in an electrode lead in a battery module according to another embodiment of the present invention.
  • FIG. 23 is another example of the enlarged configuration for the portion B2 in FIG.
  • the present embodiment only the differences from the previous embodiments will be mainly described, and the detailed description of the parts that can be applied to the same or similar parts of the previous embodiments will be omitted.
  • each of the welding spots may be configured in the form of a tornado having two welding lines in a spiral form .
  • two or more weld spots may be configured so that the straight lines connecting the outer ends are formed in different directions. More specifically, in the configuration of Fig. 23, the straight lines connecting the respective outer ends of the three welding spots Wd, We, Wf may be formed in different directions. 23, a straight line connecting the outer ends of the two welding lines Wd1 and Wd2 to the welding spot Wd is referred to as C5 and two straight lines connecting the two welding lines We1, A straight line connecting the outer ends of the two welding lines Wf1 and Wf2 with respect to the welding spot Wf is referred to as C7. At this time, the straight lines C5, C6, and C7 may be configured so as not to be parallel to each other.
  • the straight line C6 may be configured to be inclined at an angle of about 30 degrees with respect to the straight line C5, and the straight line C7 may be configured to be inclined at an angle of about 60 degrees with respect to the straight line C5.
  • at least two or more welding spots provided in one electrode lead are not formed in exactly the same shape as each other, but are arranged in a range of more than 0 degrees and smaller than 360, It can be said that
  • the outer end connecting straight line of each welding spot may be configured so as not to be parallel to each other for all the welding spots. That is, all of the welding spots within one electrode lead are not formed to be equal to each other but may be configured to be rotated at a predetermined angle with respect to the center point.
  • the weldability between the electrode leads and / or the electrode leads and the bus bar can be stably ensured regardless of the direction in which the tensile force is applied.
  • the welding direction of the welding line at the outer end portion is formed differently for a plurality of welding spots. Therefore, in this case, even if the stress is applied in a specific direction, the fatigue of the outer end of each welding spot can be changed, and there can be a welding spot where the welding property is strongly maintained. Therefore, regardless of the direction in which the tensile force acts on the electrode leads, the weldability can be stably secured.
  • W1 first welding line
  • W2 second welding line

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Abstract

L'invention concerne un module de batteries dont la capacité de soudage est améliorée entre les conducteurs d'électrodes et/ou entre les conducteurs d'électrodes et les barres omnibus. Le module de batteries selon la présente invention comprend : un ensemble de piles ayant une pluralité d'accumulateurs, lesquels sont empilés dans au moins une direction, ont respectivement des conducteurs d'électrodes, et sont connectés électriquement entre eux par la connexion entre les conducteurs d'électrodes ; et une ou plusieurs barres omnibus formées d'un matériau électriquement conducteur et entrant en contact avec les conducteurs d'électrodes de l'accumulateur afin d'être connectées électriquement avec eux. Au moins un des conducteurs d'électrodes peut être couplé et fixé, par un point de soudage formé sous l'aspect d'une tornade, à au moins un élément parmi un conducteur d'électrode entrant en contact avec lui et une barre omnibus entrant en contact avec lui.
PCT/KR2018/007986 2017-07-14 2018-07-13 Module de batteries WO2019013591A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CN201880005614.5A CN110140235B (zh) 2017-07-14 2018-07-13 电池模块以及包括该电池模块的电池组和车辆
EP18832083.2A EP3654411B1 (fr) 2017-07-14 2018-07-13 Module de batteries
ES18832083T ES2972804T3 (es) 2017-07-14 2018-07-13 Módulo de batería
PL18832083.2T PL3654411T3 (pl) 2017-07-14 2018-07-13 Moduł akumulatorowy
US16/345,862 US11011804B2 (en) 2017-07-14 2018-07-13 Battery module
JP2019548854A JP7027634B2 (ja) 2017-07-14 2018-07-13 バッテリーモジュール

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KR20170089717 2017-07-14
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CN114868303A (zh) * 2019-11-20 2022-08-05 Sk新能源株式会社 电池模块
CN114868303B (zh) * 2019-11-20 2024-04-05 Sk新能源株式会社 电池模块
CN111426685A (zh) * 2020-03-20 2020-07-17 合肥国轩高科动力能源有限公司 一种锂电池激光焊接的检测方法

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