KR20190119255A - High voltage bus bar manufacturing method for electric car - Google Patents

Abstract

The present invention relates to a high voltage bus bar manufacturing method for an electric car. The high voltage bus bar manufacturing method for an electric car comprises a preparing step (S1), a preheating step (S2), a welding step (S3), a melting molding step (S4), a grounding terminal region determining step (S5), and a delaminating step (S6). A bus bar is preheated to heat-fix a thermally-bonded insulation mixture of a powder state including nylon particles by heat welding and reheat and melt the same so as to form an insulation coating layer with a regular thickness. The insulation coating layer of both end regions of the bus bar is cut to form a cutting line so as to peel an abandoned coating layer of the outside by using the cutting line as boundaries, thereby forming a grounding terminal without damage to a surface (plating) of the bus bar.

Description

High voltage bus bar manufacturing method for electric car

The present invention relates to a method for manufacturing a high-pressure busbar for an electric vehicle, and more particularly, to heat-fusion fix an insulation mixture prepared in a powder state containing nylon particles by preheating the busbar and heat-melting it. After forming the insulation coating layer with uniform thickness, cut the insulation coating layer at both ends of the busbar to form a cutting line, and peel off the outer discard coating layer around the cutting line to form the ground terminal without damaging the busbar surface (plating). It relates to a high-pressure busbar manufacturing method for an electric vehicle.

In general, a busbar is a conductive line for supplying power to a driving motor in an environmentally friendly vehicle such as a hybrid vehicle or an electric vehicle, and mainly configures a battery pack by electrically connecting a plurality of battery cells mounted in the vehicle. In recent years, as the battery pack capacity and output of electric vehicles increase, high voltage is applied to the busbars, so the standard for insulation treatment is reinforced.

Accordingly, in Patent Publication No. 10-567755, which is conventionally published, a polyvinyl chloride (PVC), a plasticizer (DOP), a non-toxic stabilizer, a flame retardant and a pigment in a powder form to coat (or coat) a busbar in a vacuum at a predetermined ratio. A vacuum mixing step of mixing the mixture through agitation and removing bubbles mixed on the liquid raw material in the mixing process by operating a vacuum pump; and before dipping the busbar into the mixed raw material, 300 A preparation step consisting of a heating step of heating for 10 minutes in a heating furnace of ℃; The coating step of dipping the busbar for 20-30 seconds in the dipping tank of the dipping machine containing the liquid raw material prepared by color through the vacuum mixing step, and the busbar coated on the surface in the coating step to the heating furnace Including a dipping step consisting of a aging step to harden the coating state by heating for 30 seconds at a temperature of 150 ~ 300 ℃, and a cooling step to cool the coated bus bar by putting the bus bar subjected to the aging step in cooling water for 1 minute. The technology made is pre-registered.

However, the prior art has a problem in that the thickness of the coating layer is uneven due to the phenomenon of flowing down by gravity after the coating step is made, including a coating step of dipping the busbar in a liquid mixed raw material, and the mixed raw material. Heats up at 300 ℃ for 10 minutes, it takes a lot of time and energy to prepare and also needs to be heated continuously to keep the mixed raw materials in a liquid state. There was a problem.

In addition, due to the characteristics of polyvinyl chloride (PVC), which is the main ingredient of the mixed raw material, cold resistance is low, so it is easily cracked when exposed to the external environment in winter, so it is not suitable for a battery pack busbar for an electric vehicle. The surface of the busbar was rubbed in the process of partially peeling both ground terminal parts, and in the case of the high-pressure busbar for the electric vehicle, the corrosion-plated part of the surface was damaged, leading to a closed end that shortened the busbar life.

Accordingly, the present invention has been conceived to solve the above problems, preheating the busbar to heat-bond the insulation mixture prepared in the powder state containing the nylon particles by heat fusion, and heat-melt it again to a uniform thickness After forming the insulation coating layer, cut the insulation coating layer at both ends of the busbar to form a cutting line, and peel off the outer discard coating layer around the cutting line to form the ground terminal without damaging the busbar surface (plating). It is an object of the present invention to provide a method for manufacturing a high pressure busbar for a fire.

Features of the present invention to achieve this object, the preparation step (S1) for forming a fastening hole (1a) at both ends of the busbar (1); The preheating step (S2) of the bus bar (1) having passed through the preparation step (S1) to the first heating unit 100 and heated to 180 ~ 250 ℃; After the preheating step (S2), the fusion step (S3) for thermal welding and fixing the insulating mixture 10 of the powder state containing the nylon particles on the busbar (1) surface; The bus bar 1 passed through the fusion step S3 is introduced into the second heating part 100 ′ to melt the insulating mixture 10 in a powder state at 180 ° C. to 250 ° C. to form the insulating coating layer 20. Molding step (S4); Laser cutting the insulating coating layer 20 to form a cutting line 30 on both ends of the bus bar (1), and to determine the ground terminal area for dividing the discard coating layer 20 'with the cutting line 30 (S5) ); It is characterized in that it comprises a; peeling step (S6) to form a ground terminal (1 ') by removing the discard coating layer (20') of both ends of the busbar (1) on the basis of the cutting line (30).

In this case, the first and second heating parts 100 and 100 ′, the heating chamber 110 is provided so that the inlet and outlet 112, 114 at both ends are opened and closed by the door (112a) (114a), Inside the heating chamber 110 at the bottom of the heating chamber 110 through the movement path 120 is opened in the direction of the inlet 112 to the outlet 114 on the bottom surface of the heating chamber 110 through the movement path 120 And a plurality of shuttle rods 130 having a bus bar 1 fastening portion 132 at an end thereof, and installed at a lower portion of the heating chamber 110 to orbit a plurality of shuttle rods 130. Characterized in that it comprises a chain belt 140.

In addition, the first and second heating parts 100 and 100 ′ are orbitally moved within the heating chamber 110 and the heating chamber 110 in which the doorway 116 is opened and closed by the door 116a. It is characterized in that it comprises a chain belt 150, the shuttle rod 160 is connected to the chain belt 150 orbital movement, and provided with a bus bar (1).

In addition, in the fusion step (S3), the insulating mixture 10 of the powder state is stored in the powder tank 200 of which the upper part is opened, and the plurality of air nozzles 210 are installed in the powder tank 200 to the lower portion Compressed air is injected in the upward direction to form an air stem 220, characterized in that the insulating mixture 10 in the powder state by the compressed air is supported to reduce the frictional resistance when the bus bar (1) input. do.

In addition, in the fusion step (S3), the bus bar (1) after passing through the powder tank 200, characterized in that the non-fused insulation powder mixture 10 is provided by the vibration generating unit 300 is separated. .

In addition, in the step of determining the ground terminal region (S5), the busbar 1 is clamped to rotate the rotation clamp 400 and the insulating coating layer 20 of the busbar 1 rotated by the rotary clamp 400 It is characterized in that it comprises a laser generating unit 420 to form a strip-shaped cutting line 30 by cutting.

In addition, in the ground terminal region determination step (S5), the laser generating unit on the jig 500 on which the bus bar 1 is seated, and the upper or lower surface of the bus bar 1 seated on the jig 500, or on the upper and lower surfaces. 520 is installed to form a cutting line 30 is characterized in that it is provided.

In addition, in the step of determining the ground terminal region (S5), the discard coating layer 20 'is characterized in that it is provided to be divided by the cutting line 40 is connected to the cutting line 30 at different angles.

In addition, in the peeling step (S6), the clamp 600 for fixing the bus bar 1, and the non-metal scraper 620 for pressing the discard coating layer 20 'bordering the cutting line 30 is made of It is characterized by.

In addition, in the fusion step (S3), the upper edge portion of the powder tank 20 is characterized in that the suction nozzle 230 is provided to suck the insulating mixture 10 of the powder state scattered in the air.

According to the above configuration and action, the present invention heat-fix the heat-fixed insulation mixture prepared in the powder state containing the nylon particles by preheating the busbar, and heat-melting it again to form an insulation coating layer with a uniform thickness By cutting only the insulating coating layer at both ends of the busbar, a cutting line is formed, and the outer discard coating layer is peeled off along the cutting line to form a ground terminal without damaging the busbar surface (plating).

1 is a block diagram schematically showing a method for manufacturing a high-voltage busbar for an electric vehicle according to an embodiment of the present invention.
Figure 2 is a schematic diagram showing a method of manufacturing a high-pressure bus bar for an electric vehicle according to an embodiment of the present invention.
3 to 4 is a block diagram showing the first and second heating parts of the high-pressure busbar manufacturing method for an electric vehicle according to an embodiment of the present invention.
5 is a block diagram showing a fusion step of the high-pressure busbar manufacturing method for an electric vehicle according to an embodiment of the present invention.
6 to 7 is a block diagram showing the ground terminal area determination step of the high-voltage busbar manufacturing method for an electric vehicle according to an embodiment of the present invention.
8 is a block diagram showing a peeling step of the high-pressure busbar manufacturing method for an electric vehicle according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically showing a method for manufacturing a high pressure bus bar for an electric vehicle according to an embodiment of the present invention, and FIG. 2 is a schematic view showing a method for manufacturing a high pressure bus bar for an electric vehicle according to an embodiment of the present invention. It is a block diagram.

The present invention relates to a method for manufacturing a high pressure busbar for an electric vehicle, wherein the method for manufacturing a high pressure busbar for an electric vehicle is heat-sealed and fixed to heat-bond the powder-containing insulating mixture containing nylon particles by preheating the busbar. After heating and melting to form an insulating coating layer with a constant thickness, the insulating coating layers at both ends of the busbar are cut to form a cutting line, and the outer discard coating layer is peeled off along the cutting line to damage the busbar surface (plating). In order to form a ground terminal without a main step including the preparation step (S1), preheating step (S2), fusion step (S3), melt molding step (S4), ground terminal area determination step (S5), peeling step (S6) Consists of the configuration.

1. Preparation (S1)

The preparation step S1 according to the present invention is a step of forming the fastening hole 1a at both ends of the busbar 1. The bus bar 1 press-processes the copper plate to form a conductive bar having fastening holes 1a formed at both ends, where the fastening holes 1a are used as bolt fastening portions when connecting battery cells for electric vehicles. On the other hand, the bus bar (1) after the press working step is preferably plated with nickel plating or tin plating is prepared in a state where the strength is reinforced while ensuring corrosion resistance.

2. Preheating step (S2)

Preheating step (S2) according to the present invention, the bus bar (1) after the preparation step (S1) is a step of heating to 180 ~ 250 ℃ by putting in the first heating unit (100). The busbar 1 is heated to 180 to 250 ° C. so that the insulating mixture 10 in a powder state is melted and attached to the surface of the busbar 1 when the busbar 1 is introduced into the powder bath 200 in the fusion step S3 described later. In this case, the heating unit 100 for heating the sub-bar 1 is provided as a straight type or a rotary type as shown in FIG. 4 as shown in FIG. 3, which will be described later with reference to FIGS. 3 to 4.

In FIG. 3, the first heating unit 100 according to an embodiment includes a heating chamber 110 provided at both ends thereof with openings and exits 112 and 114 opened and closed by doors 112a and 114a. The heating chamber 120 is opened in the direction from the inlet 112 to the outlet 114 on the bottom surface of the heating chamber 110 and the heating chamber 110 under the heating chamber 110 through the moving passage 120. A plurality of shuttle rods 130 extending inward and having a bus bar 1 fastening portion 132 at an end thereof, and installed at a lower portion of the heating chamber 110 to orbit a plurality of shuttle rods 130. It comprises a chain belt 140 is provided. 3 (a) is a cross-sectional view showing the plane of the first heating unit 100. When the door 112a of the inlet 112 side is opened, the shuttle rod 130 is moved by the driving force of the chain belt 140 and the busbar ( 1) is introduced into the heating chamber 110, a plurality of shuttle rods 130 are introduced into the heating chamber 110, discharge and input is repeated in sequence, and the bus bar (1) heating process is performed continuously .

In addition, Figure 3 (b) is a longitudinal cross-sectional view showing the first heating portion 110, the chain belt 140 is located under the heating chamber 110, the shuttle rod connected to the chain belt (140) Since 130 is transported along the moving path 120 opened to the bottom of the heating chamber, heat damage of the chain belt 140 due to internal heat of the heating chamber 110 is prevented and heat loss of the internal heating chamber 110 is prevented. There is an advantage.

In FIG. 4, the first heating unit 100 according to another embodiment may include a heating chamber 110 and an orbital movement within the heating chamber 110 provided with the door 116 opened and closed by the door 116a. It comprises a chain belt 150, the shuttle rod 160 is connected to the chain belt 150 orbital movement, is provided so that the bus bar (1) is caught. The doorway 116 is open at one side of the heating chamber 110 so that the busbar 1 is loaded and unloaded, and a pair of chain belts 150 are orbited by a plurality of sprockets inside the heating chamber 110. The movement, the pair of chain belt 150 is connected to each other by a horizontal shuttle rod 160 is provided so that the busbar 1 is fastened to the medallin fasteners (rings bound to the busbar fastening hole).

When the chain belt 150 is rotated at an isometric angle, when the shuttle rod 160 stops at a position corresponding to the doorway 116, the door 116a is opened to open the first busbar 1 heated by the robot arm. After loading and unloading into the fusion step (S3) to be described later, the bus bar 1 is repeatedly loaded to take the new bus bar 1 to the shuttle rod 160 to continuously heat the bus bar 1.

3. Fusion step (S3)

The fusion step (S3) according to the present invention, after the preheating step (S2), is a step of thermal welding fixing the insulating mixture 10 of the powder state containing the nylon particles on the surface of the busbar (1). In this case, the insulating mixture may include an orange pigment so that the insulating coating layer 20 may be identified as orange.

In FIG. 5 (a), the powdered insulating mixture 10 is stored in a powder tank 200 having an open top, and a plurality of air nozzles 210 are installed inside the powder tank 200 to upward from the bottom. As the compressed air is injected to form an air stem 220, the insulating mixture 10 in the powder state is supported by the compressed air to reduce the frictional resistance when the bus bar 1 is injected. The insulating mixture 10 is prepared in a size of 20 to 60 Micron particles, and the particles of the insulating mixture 10 in a powder state are prepared without being compacted by compressed air injected through the air nozzle 210.

Accordingly, when the busbar 1 is introduced into the powder tank 200, the busbar 1 is quickly supplied in the direction of gravity without receiving frictional resistance due to the flotation force of the powdered insulating mixture 10, and then the busbar 1 itself is retained. The thermally insulating mixture 10 is melted by heat and fused to the busbar 1 surface. Since the insulating mixture 10 in the powder state is attached due to the fusion method using the bus bar 1 own heat, the insulation thickness 10 has an advantage of maintaining the fusion thickness uniformly.

On the other hand, in Figure 5 (b), the upper edge portion of the powder tank 20 is provided with a suction nozzle 230 to suck the insulating mixture 10 of the powder state scattered in the air. Suction nozzle 230 is disposed in a plurality of places, or is installed in a ring shape to suck the air, the powdered insulating mixture 10 is scattered in the powder tank 20 to move to the upper part is recovered and processed in the workplace As well as being kept clean, reuse of the recovered powdered insulating mixture 10 prevents expensive waste of materials.

In addition, in the fusion step (S3), the bus bar 1 is provided after the powder bath 200, the unfused insulation powder mixture 10 is separated by the vibration generating unit 300. The bus bar 1 is moved in a locked state to the ring-shaped fastener, and is configured to transmit the vibration of the vibration generating unit 300 to the fastener. When the vibration of the vibration generating unit 300 is applied, the powdered insulating mixture 10 remaining in the unfused state on the surface of the busbar 1 is removed and removed, so that the uniformity of fusion thickness uniformity of the insulating mixture 10 is more precise. maintain.

4. Melt molding step (S4)

In the melt molding step S4 according to the present invention, the busbar 1 having undergone the fusion step S3 is introduced into the second heating part 100 ′ and the insulating mixture 10 in a powder state at 180 to 250 ° C. Melting to form the insulating coating layer 20. When the bus bar 1 is heated to 180 to 250 ° C. in the second heating part 100 ′, the insulating mixture 10 in a powder state is completely melted and fused to each other to form a single insulating coating layer 20. At this time, since one side of the powdered insulating mixture 10 is fused to the busbar 1, the powder is mixed and integrally heated and melted from the outside of the powdered insulating mixture 10 when it is injected into the second heating part 100 '. As a result, the problem of flowing down in the molten state is prevented.

Meanwhile, since the second heating unit 100 ′ has the same configuration as the first heating unit 100 of the preheating step S2, the second heating unit 100 ′ will be described in detail with reference to FIGS. 3 to 4. Refer to the description of the first heating unit 100.

5. Ground terminal area determination step (S5)

In the step of determining the ground terminal region according to the present invention (S5), the insulating coating layer 20 is laser cut to form cutting lines 30 at both ends of the bus bar 1, and a discard coating layer bordering the cutting line 30. (20 ') is distinguished. Here, the insulating insulation coating layer 20 is cut by the laser generators 420 and 520, wherein the laser generators 420 and 520 are configured such that only the insulation coating layer 20, which is a non-metal, is cut. 30) to prevent damage to the busbar and busbar surface plating layer during formation. At this time, the insulating coating layer 20 is configured to be automatic as shown in Figure 6 (a) or semi-automatic as shown in Figure 6 (b), for a detailed description thereof will be described with reference to FIG.

In Figure 6 (a), in the ground terminal region determination step (S5), the bus bar (1) is clamped by the rotary clamp 400 and the rotational movement of the bus bar (1) rotated by the rotary clamp 400 It comprises a laser generator 420 for cutting the insulating coating layer 20 to form a strip-shaped cutting line (30). The rotary clamp 400 is provided to be rotated by the driving unit in a state in which the end of the busbar 1 is clamped to be exposed, and the laser generating unit 420 irradiates the laser toward the insulating coating layer 20 at a fixed position. A strip-shaped cutting line 30 is formed, and the discard coating layer 20 ′ to be peeled off is separated in the peeling step S6 described below based on the cutting line 30.

6 (b), in the ground terminal region determination step (S5), the jig 500 on which the bus bar 1 is seated, and the top or bottom or upper or lower bus bar 1 seated on the jig 500; The laser generating unit 520 is installed on the lower surface to form the cutting line 30. The jig 500 is provided such that the cutting line 30 is formed at the laser irradiation point of the laser generator 520 in consideration of the busbar shape. When the start button is operated while the busbar 1 is loaded on the jig 500, the insulating coating layer 20 is cut while the laser generator 520 or the jig 500 moves to form the cutting line 30. Then, the discard coating layer 20 ′ to be peeled off in the peeling step S6 described below based on the cutting line 30 is separated.

In FIG. 7, in the step of determining the ground terminal region (S5), the discard coating layer 20 ′ is provided to be divided by the cutting lines 40 connected to the cutting lines 30 at different angles. That is, as the discard coating layer 20 'is cut into 2 to 6 equal parts by the laser generating unit 520 to form the cutting line 40, the discard coating layer 20' without exerting a large force in the peeling step S6. Is formed.

6. Peeling step (S6)

The peeling step S6 according to the present invention is a step of forming the ground terminal 1 'by removing the discard coating layer 20' at both ends of the busbar 1 based on the cutting line 30. That is, when the discard coating layer 20 'is locally removed at both ends of the busbar, the ground terminal 1' is formed by exposing both ends of the busbar 1 together with the fastening hole, and the ground terminal 1 'is connected through the fastening hole. It is fastened to the battery cell to form a battery pack.

In FIG. 8, a clamp 600 for fixing the busbar 1 and a non-metal scraper 620 for pressing the discard coating layer 20 ′ on the cutting line 30 are included. The non-metal scraper 620 is disposed on one side or both sides of the bus bar 1, and pulls the discard coating layer 20 ′ in a state of being fitted into a gap between the cutting lines 30.

That is, the cutting line 30 is formed by cutting only the insulating coating layer 20 at both ends of the bus bar 1, and peeling off the outer discard coating layer 20 ′ at the cutting line 30. 1) The ground terminal 1a is quickly formed without damaging the surface plating portion.

On the other hand, the powdered insulating mixture 10 containing nylon particles has excellent cold resistance and insulation, and has a high durability, so that when the insulating coating layer 20 is formed on the entire area of the busbar 1, the ground terminal 1a region is formed. The problem that the surface plating layer is damaged due to excessive pressing force when peeling the insulating coating layer 20 at both ends of the busbar 1 to solve the problem is solved.

1: busbar 10: insulation mixture
20: insulation coating layer 20 ': discard coating layer
30: cutting line 40: cutting line
100, 100 ': first and second heating sections 20: powder bath
300: vibration generating unit 400: rotary clamp
500: laser generating unit 600: clamp

Claims (10)

A preparation step (S1) of forming a fastening hole (1a) at both ends of the busbar (1);
The preheating step (S2) of the bus bar (1) having passed through the preparation step (S1) to the first heating unit 100 and heated to 180 ~ 250 ℃;
After the preheating step (S2), the fusion step (S3) for thermal welding and fixing the insulating mixture 10 of the powder state containing the nylon particles on the busbar (1) surface;
The bus bar 1 passed through the fusion step S3 is introduced into the second heating part 100 ′ to melt the insulating mixture 10 in a powder state at 180 ° C. to 250 ° C. to form the insulating coating layer 20. Molding step (S4);
Laser cutting the insulating coating layer 20 to form a cutting line 30 on both ends of the bus bar (1), and to determine the ground terminal area for dividing the discard coating layer 20 'with the cutting line 30 (S5) );
And a peeling step (S6) of forming a ground terminal (1 ') by removing the discard coating layer (20') at both ends of the busbar (1) with respect to the cutting line (30). High pressure busbar manufacturing method. The method of claim 1,
The first and second heating parts 100 and 100 ′, the heating chamber 110 is provided at both ends, the opening and exit 112, 114 is opened and closed by the door 112a (114a), and the heating The movement path 120 which opens in the direction from the inlet 112 to the exit 114 on the bottom surface of the chamber 110 and extends from the heating chamber 110 to the inside of the heating chamber 110 through the movement path 120. And a plurality of shuttle rods 130 having a bus bar 1 fastening portion 132 at an end portion thereof, and a chain installed below the heating chamber 110 to orbit a plurality of shuttle rods 130. High-pressure busbar manufacturing method for an electric vehicle, characterized in that comprises a belt (140). The method of claim 1,
The first and second heating parts 100 and 100 ′ include a heating chamber 110 provided with the door 116 opened and closed by the door 116a, and a chain belt orbiting in the heating chamber 110. And a shuttle rod (160) connected to the chain belt (150) and orbital movement and provided with the bus bar (1). The method according to any one of claims 1 to 3,
In the fusion step (S3), the insulating mixture 10 of the powder state is stored in the powder tank 200, the top of which is opened, a plurality of air nozzles 210 are installed inside the powder tank 200 from above the upper Compressed air is injected in the direction to form an air stem 220, characterized in that the insulating mixture 10 in the powder state is supported by the compressed air is provided to reduce the frictional resistance when the bus bar (1) is injected Method for manufacturing high pressure busbars for automobiles. The method of claim 4, wherein
In the fusion step (S3), the bus bar (1) after passing through the powder tank 200, the electric vehicle, characterized in that the unfused fusion insulation powder mixture 10 is provided by the vibration generating unit 300 is separated High pressure busbar manufacturing method. The method of claim 1,
In the ground terminal region determination step (S5), the bus bar 1 is clamped to rotate the rotation clamp 400 and the insulating coating layer 20 of the bus bar 1 rotated by the rotation clamp 400. The high-pressure busbar manufacturing method for an electric vehicle, characterized in that it comprises a laser generating portion 420 to form a band-shaped cutting line 30 by cutting. The method of claim 1,
In the ground terminal region determination step (S5), the laser generating unit 520 is disposed on the jig 500, on which the busbar 1 is seated, and on the top, bottom, or top and bottom surfaces of the busbar 1 seated on the jig 500. ) Is installed to form a cutting line 30, the high-voltage busbar manufacturing method for an electric vehicle. The method according to claim 6 or 7,
In the step of determining the ground terminal region (S5), the discard coating layer (20 ') is a high pressure for an electric vehicle, characterized in that it is provided by the cutting line 40 is connected to the cutting line 30 at different angles. Busbar manufacturing method. The method of claim 1,
In the peeling step (S6), characterized in that it comprises a clamp 600 for fixing the bus bar (1), and a non-metal scraper 620 for pressing the discard coating layer 20 'bordering the cutting line (30). The high pressure busbar manufacturing method for an electric vehicle. The method of claim 4, wherein
In the fusion step (S3), the high pressure bus bar for an electric vehicle, characterized in that the suction nozzle 230 is provided at the upper edge portion of the powder tank 20 to suck the insulating mixture 10 of the powder state scattered in the air. Manufacturing method.

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