CN219226564U - Insulation structure and battery - Google Patents

Abstract

The utility model provides an insulating structure and a battery, and relates to the technical field of vehicle parts. The electrolyte can only infiltrate from the gap between the bottom support sheet and the bottom surface of the film, and then infiltrates into the battery core through the cutting part, and the linear cutting part is arranged on the bottom surface of the film, so that the battery core is different from the conventional hole, if the battery core is subjected to powder falling, the battery core is difficult to fall out from the cutting part, and even if the battery core falls out from the cutting part, the bottom support sheet is protected, and the battery can not be in contact with the battery shell to cause short circuit, so that the safety of the battery is improved.

Description

Insulation structure and battery

Technical Field

The utility model relates to the technical field of vehicle parts, in particular to an insulating structure and a battery.

Background

With the adoption of a large number of lithium ion batteries as power sources for new energy automobiles, the lithium ion battery industry is rapidly developed. Unlike cylindrical and soft-packed lithium ion batteries, in the manufacturing process of square aluminum-shell lithium ion batteries, a layer of insulating film is generally required to be wrapped on a winding core and then the winding core is put into a shell, in order to ensure that electrolyte can permeate into an electric core inside the insulating film, a permeation hole is generally required to be formed in the bottom of the insulating film, and although the insulating film can realize permeation of the electrolyte, as the electric core is generally a cuboid, powder (powder refers to anode materials and cathode materials on a pole piece) can be generated after the electric core collides with a round corner at the side wall of a shell, and the dropped powder is possibly in contact with the battery shell to cause short circuit, so that a certain potential safety hazard exists.

Disclosure of Invention

The utility model aims to solve the problem that potential safety hazards exist when the existing insulating film outside the battery cell allows electrolyte to permeate.

In order to solve the problems, the utility model provides an insulation structure, which comprises a planar insulation film and a bottom support piece, wherein the planar insulation film comprises a folding part and a film bottom surface, the folding part is folded to enable the planar insulation film to form a cylindrical insulation bag with an open top, the cylindrical insulation bag wraps the bottom surface and the circumferential side surface of an electric core, the top edge of the circumferential side wall of the cylindrical insulation bag is in sealing connection with a cover plate of a battery, the film bottom surface is provided with at least one group of linear cutting parts, the cutting parts penetrate through the film bottom surface, the bottom support piece is arranged on one side, far away from the electric core, of the film bottom surface, and the bottom support piece covers the linear cutting parts.

Compared with the prior art, the insulation structure provided by the utility model has the following beneficial effects:

when the insulating structure is used for packaging the battery core of the battery, the bottom support piece can be connected to one side of the bottom surface of the film, the bottom support piece connected to the bottom surface of the film is used for covering the cutting part, then the bottom surface of the battery core is horizontally placed on one side of the film bottom surface of the planar insulating film, which is far away from the bottom support piece, afterwards, the folding part of the planar insulating film can be folded to form a cylindrical insulating bag with an open top, the cylindrical insulating bag further wraps the bottom surface and the circumferential side surface of the internal battery core, then the cover plate of the battery can be fixed to the top of the battery core, the polar posts in the cover plate are in butt joint conduction with the polar lugs on the top of the battery core, the cover plate and the top edge of the circumferential side wall of the cylindrical insulating bag are sealed by plastic, and finally the cover plate and the top edge of the circumferential side wall of the cylindrical insulating bag are all filled into the battery shell.

Further, the shoe sheet is point-connected to the bottom surface of the membrane.

Further, a plurality of connection points are arranged on the bottom support sheet, the connection points and the cutting parts are staggered, and the bottom support sheet is bonded or hot-melt welded with the bottom surface of the film through the connection points.

Further, the two ends of the bottom support piece are respectively provided with a first positioning hole, and the bottom surface of the film is provided with a second positioning hole corresponding to the first positioning hole.

Further, in the length direction of the bottom support piece, the distance from the center of the first positioning hole to the corresponding end part of the bottom support piece is 5-25mm; and/or the length of the bottom support piece is 5-10mm smaller than the inner length of the battery shell, and the width of the bottom support piece is 4-10mm smaller than the inner width of the battery shell.

Further, the cutting parts are provided with two groups, the two groups of cutting parts are sequentially arranged along the width direction of the bottom surface of the film, each group of cutting parts comprises a plurality of cutting parts sequentially arranged along the length direction of the bottom surface of the film, through holes are formed in the bottom support sheet and penetrate through the upper surface and the lower surface of the bottom support sheet, and the through holes are staggered with the cutting parts.

Further, the folded part comprises a first film big surface, a second film big surface, two bottom turnover surfaces, two first side turnover surfaces and two second side turnover surfaces, wherein the first film big surface and the second film big surface are respectively connected to two long sides of the film bottom surface, the two bottom turnover surfaces are respectively connected to two short sides of the film bottom surface, the two first side turnover surfaces are respectively connected to two opposite sides of the first film big surface, the two second side turnover surfaces are respectively connected to two opposite sides of the second film big surface, the first film big surface and the second film big surface are respectively wrapped on two first side surfaces which are oppositely arranged in the battery core, one bottom turnover surface and the second side turnover surface on the same side are wrapped on one second side surface in the battery core, the other first side surface, the bottom surface on the same side and the second side turnover surface on the same side are respectively connected to two second side surfaces in the battery core, and the second side surfaces in the battery core are wrapped on the second side surfaces.

Further, a first folding line trace is arranged between the first film large surface and the film bottom surface, a second folding line trace is arranged between the second film large surface and the film bottom surface, third folding line traces are respectively arranged between the bottom folding surface and the film bottom surface, fourth folding line traces are respectively arranged between the first side folding surface and the first film large surface, and fifth folding line traces are respectively arranged between the second side folding surface and the second film large surface.

Further, two fourth folding lines between the first side folding surface and the first film large surface are arranged, the two fourth folding lines are parallel and are arranged at intervals, two fifth folding lines between the second side folding surface and the second film large surface are arranged, and the two fifth folding lines are parallel and are arranged at intervals.

The utility model also provides a battery comprising the insulating structure.

Since technical improvements and advantageous effects of the battery are the same as those of the insulating structure, the battery will not be described.

Drawings

FIG. 1 is a schematic diagram of an insulation structure according to an embodiment of the present utility model;

fig. 2 is a schematic structural view of a first planar insulating film according to an embodiment of the present utility model;

fig. 3 is a schematic structural view of a first planar insulating film folded into a cylindrical insulating bag with an open top according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of a second planar insulating film according to an embodiment of the present utility model;

fig. 5 is a schematic view showing a structure in which a second planar insulating film according to an embodiment of the present utility model is folded into a cylindrical insulating bag with an open top and then placed in a battery case.

Reference numerals illustrate:

1. a bottom support sheet; 11. a first positioning hole; 12. a through hole; 13. a connection point; 21. a membrane bottom surface; 211. a second positioning hole; 212. a cutting section; 22. a first film major surface; 23. a second film large surface; 24. a bottom turnover surface; 25. a first side fold-over surface; 26. a second side fold-over surface; 271. a first fold line trace; 272. a second fold line trace; 273. a third fold line trace; 274. fourth fold line mark; 275. fifth fold line mark; 3. a battery case; 31. and (5) side fillets.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "front", "rear", "upper", "lower", "left" and "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Moreover, in the drawings, the X-axis represents the longitudinal direction, i.e., the front-to-back position, and the positive direction of the X-axis (i.e., the arrow of the X-axis is directed) represents the front, and the negative direction of the X-axis (i.e., the direction opposite to the positive direction of the X-axis) represents the rear; the Y-axis in the drawing represents the lateral direction, i.e., the left-right position, and the positive direction of the Y-axis (i.e., the arrow of the Y-axis points) represents the left, and the negative direction of the Y-axis (i.e., the direction opposite to the positive direction of the Y-axis) represents the right; the Z-axis in the drawing represents vertical, i.e., up-down position, and the positive direction of the Z-axis (i.e., the arrow pointing in the Z-axis) represents up and down, and the negative direction of the Z-axis (i.e., the direction opposite to the positive direction of the Z-axis).

It should also be noted that the foregoing X-axis, Y-axis, and Z-axis are meant to be illustrative only and not indicative or implying that the apparatus or component in question must be oriented or configured in a particular orientation and operation and therefore should not be construed as limiting the present utility model.

Referring to fig. 1-3, an insulation structure according to an embodiment of the present utility model includes a planar insulation film and a bottom sheet 1, the planar insulation film includes a folded portion and a film bottom surface 21, the folded portion is folded to enable the planar insulation film to form a cylindrical insulation bag with an open top, the cylindrical insulation bag wraps a bottom surface and a circumferential side surface of a battery cell, a top edge of a circumferential side wall of the cylindrical insulation bag is in sealing connection with a cover plate of the battery, the film bottom surface 21 is provided with at least one set of linear cutting portions 212, the cutting portions 212 penetrate through the film bottom surface 21, the bottom sheet 1 is disposed on a side of the film bottom surface 21 away from the battery cell, and the bottom sheet 1 covers the linear cutting portions 212.

In this embodiment, when the insulating structure is used to package the battery core of the battery, the bottom support sheet 1 can be connected to one side of the film bottom surface 21, the bottom support sheet 1 connected to the film bottom surface 21 is used to cover the cutting portion 212, then the bottom surface of the battery core is horizontally placed on one side of the film bottom surface 21 of the planar insulating film far away from the bottom support sheet 1, afterwards, the folded portion of the planar insulating film can be folded to form a cylindrical insulating bag with an open top, then the cylindrical insulating bag is used to wrap the bottom surface and the circumferential side surface of the internal battery core, then the cover plate of the battery can be fixed to the top of the battery core, the polar post in the cover plate is in butt joint with the polar lug at the top of the battery core, and the cover plate is sealed with the top edge of the circumferential side wall of the cylindrical insulating bag, and finally the cover plate is filled in the battery shell 3.

It should be noted that, the tab at the top of the battery core is electrically connected with the pole on the cover plate, and the cover plate is fixed at the top opening of the battery housing 3 by means of plastic sealing, which are not in the improvement scope of the utility model, so that redundant description is omitted.

It will be appreciated that the shoe 1 is part of the edge structure of the present embodiment, and is made of an insulating material, and does not conduct electricity with the battery case 3.

On one hand, the bottom of the cylindrical insulating bag is provided with the bottom support sheet 1 made of materials, so that the cylindrical insulating bag is relatively thin and easy to deform during assembly, and the thickness of the bottom of the cylindrical insulating bag can be increased after the bottom support sheet 1 is increased, thereby being more beneficial to positioning during assembly; on the other hand, when placing on the plane insulating film after compressing tightly electric core and apron during the assembly, turn over the in-process of parcel electric core with the plane insulating film, the electric core also can push down the bottom of tube-shape insulating bag, and tube-shape insulating bag and electric core also can have the effect of pushing down to tube-shape insulating bag when battery case 3 in addition, can improve the bottom intensity of tube-shape insulating bag after increasing collet piece 1, and the pressure-bearing effect is better.

The linear cutting portion 212 may be a smooth straight line or a zigzag line.

Optionally, the shoe 1 is point-connected to the membrane bottom 21.

In this embodiment, the bottom plate 1 is connected to the bottom surface 21 of the membrane at a point, so that it is ensured that the bonding area between the bottom plate 1 and the bottom surface 21 of the membrane is permeable to the electrolyte after the bottom plate is connected to the bottom surface 21 of the membrane.

Referring to fig. 1, optionally, a plurality of connection points 13 are provided on the base sheet 1, and the connection points 13 are staggered from the cutting portions 212, and the base sheet 1 is adhered or heat-welded to the film bottom surface 21 through the connection points 13.

In this embodiment, the connection point 13 and the cutting portion 212 are staggered, that is, there is no overlapping area between the two, so that the electrolyte can be infiltrated into each position of the cutting portion 212. These connection points 13 may be connected to the film bottom surface 21 by bonding, or may be connected to the film bottom surface 21 by thermal welding.

Referring to fig. 1-3, optionally, the bottom plate 1 is provided with first positioning holes 11 near two ends in the length direction, and the bottom surface 21 of the film is provided with second positioning holes 211 corresponding to the first positioning holes 11.

In this embodiment, before the bottom support sheet 1 is connected to the bottom surface 21 of the film, the first positioning hole 11 and the second positioning hole 211 may be first perforated by a columnar structure, so as to implement the lamination positioning of the bottom support sheet 1 and the bottom surface 21 of the film, and after positioning, the subsequent point connection between the bottom support sheet 1 and the bottom surface 21 of the film is facilitated.

It will be appreciated that after the bottom sheet 1 is point-connected to the bottom surface 21 of the film, the columnar structure is removed from the first positioning hole 11 and the second positioning hole 211, and then the first positioning hole 11 is sealed by the sealant or the adhesive tape, so as to prevent powder from falling from the first positioning hole 11, or seal both the first positioning hole 11 and the second positioning hole 211.

Referring to fig. 1, optionally, in the length direction of the bottom bracket sheet 1, a distance from the center of the first positioning hole 11 to the corresponding end of the bottom bracket sheet 1 is 5-25mm; and/or the length of the bottom support sheet 1 is 5-10mm smaller than the inner length of the battery shell 3, and the width of the bottom support sheet 1 is 4-10mm smaller than the inner width of the battery shell 3.

In this embodiment, the distance from the center of the first positioning hole 11 to the corresponding end of the bottom bracket 1 is 5-25mm, so as to reduce the processing difficulty of the first positioning hole 11; if two first positioning holes 11 are provided at one end of the bottom bracket 1, the distance between the two first positioning holes 11 and the corresponding long side of the bottom bracket 1 may be 5-25mm, so that the hole distance between the two first positioning holes 11 at the same end of the bottom bracket 1 is not too large, and the two first positioning holes 11 may be sealed by using a shorter adhesive tape.

In this embodiment, the length of the bottom support piece 1 is less than 5-10mm of the internal length of the battery case 3, and the width of the bottom support piece 1 is less than 4-10mm of the internal width of the battery case 3, so that the bottom support piece 1 is conveniently installed in the battery case 3, and interference between the bottom support piece 1 and the battery case 3 during assembly is prevented.

Referring to fig. 1, optionally, two sets of cutting portions 212 are provided, the two sets of cutting portions 212 are sequentially provided along the width direction of the film bottom surface 21, each set of cutting portions 212 includes a plurality of cutting portions 212 sequentially provided along the length direction of the film bottom surface 21, through holes 12 are provided on the bottom sheet 1, the through holes 12 penetrate through the upper and lower surfaces of the bottom sheet 1, and the through holes 12 are staggered with the cutting portions 212.

In this embodiment, the bottom plate 1 may further be provided with a through hole 12, so that the electrolyte in the battery case 3 may not only permeate between the bottom plate 1 and the bottom surface 21 of the film from the edge of the bottom plate 1, but also permeate between the bottom plate 1 and the bottom surface 21 of the film from the through hole 12, and finally permeate into the battery cell from the cutting portion 212. The cutting portions 212 are provided in two groups and each group has a plurality, that is, the cutting portions 212 are arranged on the membrane bottom surface 21 in a matrix, ensuring the efficiency of the electrolyte permeation.

Referring to fig. 2 and 3, optionally, the folded portion includes a first film large surface 22, a second film large surface 23, two bottom folded surfaces 24, two first side folded surfaces 25 and two second side folded surfaces 26, the first film large surface 22 and the second film large surface 23 are respectively connected to two long sides of the film bottom surface 21, the two bottom folded surfaces 24 are respectively connected to two short sides of the film bottom surface 21, the two first side folded surfaces 25 are respectively connected to two opposite sides of the first film large surface 22, the two second side folded surfaces 26 are respectively connected to two opposite sides of the second film large surface 23, wherein the first film large surface 22 and the second film large surface 23 are respectively wrapped on two first side surfaces (front side surface and rear side surface of the electric core), one folded surface 25, the bottom surface 24 on the same side and two short sides of the film bottom surface 21 are respectively connected to two short sides of the film bottom surface 21, the second side folded surface 26 is respectively connected to two opposite sides of the second side folded surface of the electric core, the first side folded surface is wrapped on the first side surface of the first side folded surface (front side surface and the rear side surface of the electric core), and the second side folded surface of the second side folded surface is wrapped on the second side surface of the second side of the electric core (the electric core), and the second side folded surface is wrapped on the second side surface of the second side of the electric core (the second side of the electric core) is wrapped on the second side of the second side surface (the side of the electric core).

In this embodiment, the first large film surface 22 and the second large film surface 23 are folded upwards to wrap the front side and the rear side of the battery cell; then, the first side folding surface 25 on the left side of the first film large surface 22 is folded again, the second side folding surface 26 on the left side of the second film large surface 23 is folded again, the second side folding surface 26 covers part of the first side folding surface 25 in the front-back direction, then the bottom folding surface 24 on the left side of the film bottom surface 21 is folded upwards, the bottoms of the first side folding surface 25 on the left side and the second side folding surface 26 are further covered, the left side wrapping and sealing of the battery core are realized after bonding, and similarly, the wrapping and sealing of the right side of the battery core is realized by the first side folding surface 25, the second side folding surface 26 and the bottom folding surface 24 on the right side after folding (fig. 3 is a perspective view of the planar insulating film after folding shown in fig. 2).

Referring to fig. 2, specifically, a first folding line trace 271 is disposed between the first large film surface 22 and the film bottom surface 21, a second folding line trace 272 is disposed between the second large film surface 23 and the film bottom surface 21, a third folding line trace 273 is disposed between the two bottom folding surfaces 24 and the film bottom surface 21, a fourth folding line trace 274 is disposed between the two first side folding surfaces 25 and the first large film surface 22, and a fifth folding line trace 275 is disposed between the two second side folding surfaces 26 and the second large film surface 23.

In this embodiment, the first folding line trace 271 is convenient for realizing the folding of the first large film surface 22 relative to the film bottom surface 21, the second folding line trace 272 is convenient for realizing the folding of the second large film surface 23 relative to the film bottom surface 21, the third folding line trace 273 is convenient for realizing the folding of the bottom folding surface 24 relative to the film bottom surface 21, the fourth folding line trace 274 is convenient for realizing the folding of the first side folding surface 25 relative to the first large film surface 22, and the fifth folding line trace is convenient for realizing the folding of the second side folding surface 26 relative to the second large film surface 23.

Referring to fig. 4, optionally, two fourth folding lines 274 are provided between each first side folding surface 25 and the first large film surface 22, and the two fourth folding lines 274 are parallel and spaced, two fifth folding lines 275 are provided between each second side folding surface 26 and the second large film surface 23, and the two fifth folding lines 275 are parallel and spaced.

In this embodiment, two fourth folding lines 274 are respectively parallel to and spaced from two sides of the first large film surface 22, and two fifth folding lines 275 are respectively parallel to and spaced from two sides of the second large film surface 23, so, after the planar insulating film is folded, an inclined plane is formed between the left side wall and the front side wall of the circumferential side wall, an inclined plane is formed between the left side wall and the rear side wall of the circumferential side wall, an inclined plane is formed between the right side wall and the front side wall of the circumferential side wall, an inclined plane is formed between the right side wall and the rear side wall of the circumferential side wall, and four inclined planes respectively correspond to the four side fillets 31 of the battery case 3, namely, as shown in fig. 5, the left side wall of the circumferential side wall of the cylindrical insulating bag is attached to the left side wall of the battery case 3, the right side wall of the circumferential side wall of the cylindrical insulating bag is attached to the right side wall of the battery case 3, the front side wall of the circumferential side wall of the cylindrical insulating bag is attached to the rear side wall of the battery case 3, and therefore the battery cell fully utilizes the inner space of the battery case 3, and the battery capacity is improved.

Another embodiment of the present utility model also provides a battery including the insulating structure as described above.

Since technical improvements and advantageous effects of the battery are the same as those of the insulating structure, the battery will not be described.

The battery can be applied to new energy automobiles and other electric equipment.

The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" and "a second" may explicitly or implicitly include at least one such feature.

Although the present disclosure is disclosed above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the disclosure.

Claims (10)

1. The utility model provides an insulation structure, its characterized in that includes plane insulating film and collet piece (1), the plane insulating film includes folding portion and membrane bottom surface (21), the folding portion is folded so that the plane insulating film forms the open tubular insulation bag that sets up in top, tubular insulation bag parcel electric core's bottom surface and circumference side, the topside of the circumference lateral wall of tubular insulation bag and the apron sealing connection of battery, membrane bottom surface (21) are provided with at least a set of linear cutting part (212), cutting part (212) run through membrane bottom surface (21), collet piece (1) set up in membrane bottom surface (21) keep away from one side of electric core, just collet piece (1) cover the line cutting part (212).

2. Insulation structure according to claim 1, characterized in that the underwire sheet (1) is point-connected to the membrane bottom surface (21).

3. Insulation structure according to claim 2, characterized in that the shoe sheet (1) is provided with a plurality of connection points (13), and the connection points (13) are staggered with the cutting part (212), and the shoe sheet (1) is adhered or hot-melt welded with the film bottom surface (21) through the connection points (13).

4. The insulation structure according to claim 2, wherein the bottom sheet (1) is provided with first positioning holes (11) at both ends thereof, respectively, and the film bottom surface (21) is provided with second positioning holes (211) corresponding to the first positioning holes (11).

5. The insulation structure according to claim 4, characterized in that the distance from the center of the first positioning hole (11) to the corresponding end of the shoe (1) is 5-25mm along the length direction of the shoe (1); and/or the length of the bottom support sheet (1) is 5-10mm smaller than the inner length of the battery shell (3), and the width of the bottom support sheet (1) is 4-10mm smaller than the inner width of the battery shell (3).

6. The insulation structure according to claim 1, wherein the cutting portions (212) are provided with two groups, the two groups of cutting portions (212) are sequentially arranged along the width direction of the film bottom surface (21), each group of cutting portions (212) comprises a plurality of cutting portions (212) sequentially arranged along the length direction of the film bottom surface (21), through holes (12) are formed in the base sheet (1), the through holes (12) penetrate through the upper surface and the lower surface of the base sheet (1), and the through holes (12) are staggered with the cutting portions (212).

7. The insulation structure according to claim 1, wherein the folded portion comprises a first film large surface (22), a second film large surface (23), two bottom folded surfaces (24), two first side folded surfaces (25) and two second side folded surfaces (26), the first film large surface (22) and the second film large surface (23) are respectively connected to two long sides of the film bottom surface (21), the two bottom folded surfaces (24) are respectively connected to two short sides of the film bottom surface (21), the two first side folded surfaces (25) are respectively connected to two opposite sides of the first film large surface (22), the two second side folded surfaces (26) are respectively connected to two opposite sides of the second film large surface (23), the first film large surface (22) and the second film large surface (23) are respectively wrapped on two first sides oppositely arranged in the electric core, the two first side folded surfaces, the second side folded surfaces (25) are respectively wrapped on two opposite sides of the electric core, the second side folded surfaces (24) are wrapped on the same side of the electric core, and the second side folded surfaces (24) are wrapped on the same side of the electric core, the two second sides and the two first sides in the battery cell constitute circumferential sides of the battery cell.

8. The insulation structure according to claim 7, wherein a first folding line mark (271) is provided between the first large film surface (22) and the film bottom surface (21), a second folding line mark (272) is provided between the second large film surface (23) and the film bottom surface (21), a third folding line mark (273) is provided between the two bottom folding surfaces (24) and the film bottom surface (21), a fourth folding line mark (274) is provided between the two first side folding surfaces (25) and the first large film surface (22), and a fifth folding line mark (275) is provided between the two second side folding surfaces (26) and the second large film surface (23).

9. The insulation structure according to claim 8, wherein two fourth folding lines (274) between each first side folding surface (25) and the first film large surface (22) are provided, and the two fourth folding lines (274) are arranged in parallel and at a distance, two fifth folding lines (275) between each second side folding surface (26) and the second film large surface (23) are provided, and the two fifth folding lines (275) are arranged in parallel and at a distance.

10. A battery comprising an insulating structure according to any one of claims 1-9.

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