FR3068121B1 - HEAT EXCHANGER HAVING A PHASE CHANGE MATERIAL RESERVOIR COMPRISING A TAB OF HOLDING AND FILLING A FILLING TUBE - Google Patents

Abstract

The present invention relates to a method for manufacturing a heat exchanger (5) comprising a heat exchange bundle delimiting a coolant circulation circuit, said heat exchange bundle comprising at least one tube (51) for circulation of said heat exchange fluid. heat transfer fluid, the heat exchanger (5) comprising at least one reservoir of phase change material (53) in thermal contact with an outer face of said at least one tube (51), said reservoir (53) being delimited by minus one tank plate (530) traversed by at least one phase change material introduction port (5303) and an opposite surface.

Description

Process for manufacturing a heat exchanger with a material tank with phase change comprising a tab for holding and closing a filling tube, and corresponding heat exchanger 1. Field of the invention

The field of the invention is that of heat exchangers, of the evaporator type in particular, for a motor vehicle.

More specifically, the invention relates to evaporators employing a phase change material. 2. Prior Art

In motor vehicles, it is known to implement an air conditioning device for regulating the temperature of the passenger compartment of the vehicle.

More specifically, these air conditioning devices use a heat exchanger, in particular an evaporator, such as that shown in FIG. 1. Such an evaporator 1 comprises a heat exchange bundle formed of a stack of tubes 10 and interlayers 11, placed between two consecutive tubes 10 and allowing a heat exchange between a flow of air passing through the beam (and more precisely through the spacers) and a coolant (such as a refrigerant) flowing in the tubes 10 .

For vehicles equipped with an automatic engine shutdown system during short stops of the vehicle in particular, a function has been developed and allows, when the engine of the vehicle is stopped and no longer drives the compressor of setting circulation of the coolant, to maintain the cooling of the passenger compartment of the vehicle, thus improving the comfort of the passengers of the motor vehicle.

To do this, the evaporator 1 uses a reservoir of phase change material 12 able to store cold when the motor vehicle engine is running and then return it to the air passing through the evaporator 1 so as to Cool it for a limited time when the vehicle engine is stopped.

A heat exchanger 1 of this type, partially illustrated in FIG. 2, comprises a tank plate 120 which, after brazing with an outer face of a tube 10 of the heat exchange bundle, forms a tank 12 filled with phase change.

It will be noted that, in a conventional manner, the tube 10 is obtained by brazing two tube plates 101, 102 between which an inner spacer 103 is placed (FIG. 2).

The tank 12 of phase change material is thus in thermal contact with an outer face of the tube 10, the tank being delimited by the tank plate 120 and an opposite surface corresponding to the outer face of the tube 10.

The tank of phase change material comprises a filling tube 121 for injecting a phase change material into the tank 12.

This filling tube 121 is obtained by cutting a tube of great length produced by extrusion. It comprises, at a first end, a phase change material introduction opening 1210 and at a second end a flattened portion 1211 whose end 1212 is closed by crimping. A side wall of the flattened portion 1211 of the filling tube 121, intended to be applied against the tank plate 120, is traversed by at least one filling orifice 1213 provided to cooperate with at least one insertion orifice 122 formed in the tank plate 120. The assembly of the heat exchanger 1 is carried out in the following manner.

Plates of tube 101, 102 are joined in pairs to form a stack of tubes 10, an inner spacer 103 being optionally interposed between the tube plates 101, 102 of a pair constituting a tube 10. Tabs 11 may be inserted into some of the spaces 13 located between the tubes 10. Some of these spaces 13 alternately house a reservoir 12 of phase change materials 12.

A filling tube 121 is placed by an operator on the tank plate 120 of each tank 12 such that its filling ports 1213 communicate with the introduction ports 122 of the corresponding tank plate 120. The filling tube 121 is optionally secured to the corresponding tank plate 120 by crimping.

A tank plate 120 associated with a filler tube 121 is placed in each desired space 13 between two consecutive tubes 10 and pressed against one of these tubes 10 to form a tank 12 of phase change material.

The components of the evaporator are held against each other by means of tools provided for this purpose before being placed in an oven for brazing in which they are secured to each other in a sealed manner .

The tube plates 101, 102 and tank plates 120 are made of clad metal. Brazing therefore does not require the addition of a filler metal, these plates being coated.

On the other hand, since the filler tubes 121 are obtained from an extruded tube, they are made of uncladed metal. The brazing of a filling tube 121 to the corresponding tank plate 120 therefore requires the supply of filler metal, for example in the form of a solder paste which, on the one hand, makes it possible to ensure the mechanical connection. from the filling tube 121 to the tank plate 120 and secondly to ensure that this connection is further sealed.

This addition of filler metal is an additional and precise operation for the operator with the load that assumes control in terms of quantity and location. This operation therefore generates additional manufacturing costs.

Proper positioning of a filler tube 121 relative to the matched tank plate 120 also requires accuracy on the part of the operator in having the load.

Furthermore, during the displacement in the oven of the pre-assembled assembly of parts, it can happen that a relative displacement occurs between the filling tube and its tank plate that can introduce a misalignment of the filling orifices 1213 and introduction 122 and therefore difficulties in subsequently injecting the phase change material into the reservoir 12.

In addition, it may happen that the mechanical strength of the connection between the filling tube 121 and the corresponding tank plate 120 is a little fair so that during the filling phase change material degradation of this connection can occur causing a risk of leakage of phase change material. OBJECTIVES OF THE INVENTION The object of the invention is in particular to provide an effective solution to at least some of these various problems.

In particular, according to at least one embodiment, an object of the invention is to provide a technique for optimizing the manufacture of a heat exchanger with a phase change material reservoir.

In particular, the object of the invention is, according to at least one embodiment, to provide such a technique which makes it possible to simplify the manufacture of a heat exchanger with a tank of material with phase change, and to reduce the cost thereof. .

Another object of the invention is, according to at least one embodiment, to provide such a technique which makes it possible to improve the mechanical connection between the filler tube and the tank plate of a tank of material with phase change. .

Another object of the invention is, according to at least one embodiment, to provide such a technique which improves the sealing of the mechanical connection between the filler tube and the tank plate of a material tank. phase change. 4. Presentation of the invention

For this, the invention proposes a method of manufacturing a heat exchanger comprising a heat exchange bundle delimiting a coolant circulation circuit, said heat exchange bundle comprising at least one circulation tube of said heat transfer fluid, the heat exchanger comprising at least one tank of phase change material in thermal contact with an outer face of said at least one tube, said tank being delimited by at least one tank plate traversed by at least one feed orifice; phase change material and an opposing surface, said tank comprising a filler tube comprising a side wall traversed by at least one filler port cooperating with said at least one orifice for introducing said tank plate, said tank plate comprising a tab for holding and closing an end of said tube, said method comprising : a step of fitting one end of said filling tube along said tongue; a step of placing said at least one filling orifice of said filling tube in communication with said at least one orifice for introducing said tank plate; a step of securing said filling tube to said tank plate by welding.

The principle of the invention therefore consists in pre-assembling the filler tube to the tank plate before brazing by introducing a tab integral with the tank plate in one end of the filler tube and placing the introduction ports in communication with one another. and filling.

The filling tube then forms with the tank plate an assembly that can be handled by an operator without the risk of displacement of the filling tube with respect to the tank plate to ensure that they retain their correct positioning before welding.

After welding, in particular by brazing, the tongue reinforces the mechanical connection between the tube and the tank plate.

According to a possible characteristic, said step of placing said at least one filling orifice of said filler tube into communication with said at least one orifice for introducing said tank plate comprises the introduction of a collar projecting from the surface of said tank plate. said tank plate around said at least one introduction port within said at least one fill port.

This improves the maintenance of the filling tube and the tank plate after pre-assembly and ensure proper alignment of the introduction and filling ports.

According to a possible characteristic, said step of fitting is followed by a folding step of said tongue until the side wall of said filling tube bears against said tank plate.

According to a possible characteristic, said folding and communicating steps take place essentially concomitantly, said tongue being configured to cause, at the end of its folding, said at least one filling orifice of said filler tube in communication with said at least one least one orifice for introducing said tank plate.

According to one possible characteristic, said step of joining by welding is of the type without filler metal, said tank plate being made of clad metal and said uncladed metal filler tube.

This avoids the need to provide filler metal to braze the filler tube to the tank plate, the one which is covered therefor brazing the filler tube. This simplifies the manufacture of the exchanger.

According to one possible feature, said step of fitting comprises inserting said tongue inside said filling tube over a length of at least one millimeter.

According to a possible characteristic, said folding step consists in folding said tab towards said tank plate essentially on 180 °, preferably essentially on 90 °.

According to a possible characteristic, a method according to the invention comprises a step of applying said tank plate against the outer surface of said tube of said heat exchange bundle, said external surface constituting said opposite surface.

According to a possible characteristic, a method according to the invention comprises a step of obtaining said tank plate and said tongue by stamping a single sheet.

The tongue may be an extension of said reservoir plate protruding at its periphery.

According to a possible characteristic, said obtaining step comprises a cutting phase of said tongue in said tank plate, said tab extending in a plane substantially parallel to said plate and shifted outside thereof.

The tongue is then formed in the wall of the tank plate which reduces the amount of material required. The invention also relates to a heat exchanger comprising a heat exchange bundle delimiting a coolant circulation circuit, said heat exchange bundle comprising at least one circulation tube of said coolant, said heat exchanger comprising at least one a phase change material tank in thermal contact with an outer face of said at least one tube, said tank being defined by at least one tank plate traversed by at least one phase change material introduction port and an opposite surface said tank comprising a filling tube comprising a side wall bearing against said tank plate, said side wall being traversed by at least one filling orifice cooperating with said at least one orifice for introducing said tank plate.

According to the invention, said tank plate comprises a tab for holding and closing said tube, said tongue being at least partly inserted inside said filling tube from one end thereof.

According to a possible characteristic, the insertion length of said tongue in said filling tube is at least equal to 1 millimeter.

According to a possible characteristic, said filling tube comprises at a first end a filling orifice and at a second end an opening, said tongue being introduced through said opening.

According to a possible characteristic, said at least one filling orifice accommodates a flange protruding on the surface of said tank plate around said at least one insertion orifice.

According to a possible characteristic, said tongue is formed in the mass of said tank plate.

According to a possible feature, said tongue is folded inside said filler tube and extends substantially parallel to said tank plate.

According to a possible characteristic, said tank of phase change material is delimited by the tank plate contiguous with said at least one tube of said heat exchange bundle, the opposite surface being formed by the external face of said at least one first tube. 5. List of Figures Other features and advantages of the invention will appear on reading the following description of particular embodiments, given by way of a simple illustrative and nonlimiting example, and the appended drawings among which: FIG. 1 illustrates a partial view of a heat exchanger according to the prior art in perspective; FIG. 2 illustrates a cross-sectional view of a tube associated with a reservoir of phase-change material and with an external interlayer of the exchanger of FIG. 1; Figures 3 and 4 illustrate perspective detail views of the connection between the filler tube and the tank plate of a tank of phase change material according to the prior art; Figure 5 illustrates a partial view of a heat exchanger according to the invention in perspective; Figure 6 illustrates an exploded partial view of the exchanger of Figure 5; FIG. 7 illustrates a cross-sectional view of a tube associated with a reservoir of phase-change material and with an external interlayer of the exchanger of FIG. 5; Figure 8 illustrates a detail view of the tongue of a tank plate before folding according to the invention; Figures 9 to 14 illustrate detailed views of the connection between a filling tube and a tank plate according to the invention; FIGS. 15 to 17 illustrate a variant of a cut-out tank plate; FIG. 18 illustrates an exemplary method of manufacturing a heat exchanger according to the invention. 6. Description of particular embodiments 6.1. Heat exchanger

FIGS. 5 to 17 show an evaporator according to the invention. The embodiment described below is an evaporator designed for heat exchange between an air flow and a refrigerant, especially for an air conditioning device of the passenger compartment of a motor vehicle.

It goes without saying that the invention also covers a condenser, a radiator or any other heat exchanger, regardless of the fluid that passes through it. The evaporator 5 according to the invention conventionally comprises a heat exchange bundle formed of a stack of tubes 51 and external spacers 52, blinds or not, placed between two consecutive tubes 51 and to increase the surface area. heat exchange between the flow of air passing through the bundle and the coolant (such as a refrigerant) flowing in the tubes 51.

One or more external spacers 52 are each substituted by a reservoir of phase change material 53 which is capable of storing cold when the engine of the motor vehicle is running and then restoring it, for a limited time, to the air passing through the evaporator when the vehicle engine is shutdown.

Such a tank of phase change material, formed of at least one tank plate 530, will be described in more detail later.

Such a beam is partially shown in FIG. 5 on which are represented four tubes 51, two external spacers 52 and a reservoir of phase change material 53.

It is of course understood that the heat exchange bundle of the evaporator 5 may consist of a plurality of tubes 51 stacked in parallel with external spacers 52 in a longitudinal stacking direction.

FIG. 6 illustrates an exploded partial view of the evaporator 5 of FIG. 5.

In this FIG. 6, the illustrated part of the evaporator bundle 5 comprises: two tubes 51 intended for the circulation of a coolant; a tank plate 530 disposed between the two tubes 51 and contiguous thereto, forming a tank 53 for storing a phase change material; and two external spacers 52 for the passage of a flow of air to be cooled through the heat exchange bundle of the evaporator 1.

As illustrated in FIG. 7, which is a cross-sectional view of a tube 51 on which a tank plate 530 is assembled, each tube 51 comprises two tube plates 510, 511 stamped and brazed to each other. between which may be arranged an inner spacer 512 in the form of a corrugated sheet.

More specifically, the plates 510, 511 are stamped so as to form, after assembly, two adjacent conduits 513, 514.

The plates 510, 511 and the inner spacer 512 are configured to be sealed together to form a plurality of channels 515 in each of the ducts 512, 514, inside which circulates a coolant, which is here a refrigerant.

A tank plate 530 is configured to be sealingly joined to an outer face of the tube 51 to form a storage tank 53 for storing a phase change material.

Although this is not illustrated in FIG. 7, since it is a partial view of the evaporator 5, the tank plate 530 is contiguous with another tube 51 situated above the tank plate. 530.

In this embodiment, the tank 53 is formed of a tank plate 530 and an opposite surface, which is constituted by an outer face of a tube 51.

Thus, the phase-change material stored in the tank 53 is in direct contact with the external face of the tube 51, which facilitates and improves the heat exchange between the coolant circulating in the tube 51 and the stored phase-change material. in the tank 53.

In the portion of the heat exchange bundle illustrated in FIG. 6, each tube 51 comprises two external faces intended to be oriented towards a tank plate 530 and an outer spacer 52 respectively.

Each tube 51 further comprises two inner faces facing each other, and opposed to the outer faces, between which is disposed the inner spacer 512.

The tank plate 530 has an open face whose periphery or periphery 5301 is intended to come into contact with the external face of the tube 51.

The face of the tank plate 530 opposite the open face has a plurality of bosses 5309 which are distributed over the entire tank plate 530.

The bosses 5309 of the tank plate 530 coupled to a first tube 51 are tangent or flush with the outer face of a second tube 51 adjacent. Air passages are thus delimited outside the tank 53 of phase change material so that an air flow can flow between the tank plate 530 and the outer face of the second tube 51 adjacent to the beam. thermal exchange of the evaporator 5. This optimizes the heat exchange between the evaporator 5 and the air flowing through it.

The reservoir 53 conventionally comprises a filling tube 8. This filling tube 8 comprises at a first end 80 a filling opening 81. The first end 80 is extended by a second end 82 flattened.

The second flattened end 82 comprises a side wall 83 intended to be applied against the tank plate 530. This side wall 83 is traversed by at least one, in this case two, filling orifices 84. The second flattened end 82 ends by an opening 85.

The tank plate 530 is traversed by at least one, in this case two, introduction orifices 5303. It comprises a tab 5302 for closing and holding the second end 82 of the filling tube 80, in this case of its opening 85.

When the evaporator is assembled, the tongue 5302 is at least partially housed inside the second end 82 of the filling tube 8 from the opening 85 thereof. The filling orifice (s) 84 of the filling tube 8 then communicate with the introduction orifice (s) 5303 of the tank plate, the number of filling orifices being equal to the number of introduction orifice.

The tongue 5302 is formed in the mass of the tank plate 530. In other words, the tongue and the tank plate form a single piece.

The tongue extends essentially in the extension of the introduction orifice (s) 5303.

The tongue 5302 is an extension of the tank plate 530. It protrudes at its periphery and is partially folded substantially perpendicular to the plane of the tank plate and then substantially parallel to this plane towards the inside of the tank plate and way away from it to enter the second end 82 of the filling tube through the opening 85.

The dimensions of the tongue 5302 are chosen such that: the filling tube 8 can be fitted along it by introducing the end of the tongue 5302 from the opening 85, when the side wall 83 filling tube 8 is applied against the tank plate 530, filling orifice (s) 84 communicate with the introduction orifice (s) 5303, and after soldering of the assembly, the junction between the filling tube 8 and the tank plate 530 is sealed.

The tongue 5302 then closes the opening 85 of the end of the filling tube and holds it in position.

The tank plate 530 comprises a recess 5305 to accommodate the flattened end 82 of the filler tube 8 so that when the filler tube 8 is secured to the tank plate 530, its side wall 86 faces outwardly. of the tank plate 530 is substantially flush with the outer wall thereof.

In the variant illustrated in FIGS. 15 to 17, the tongue 5302 does not protrude at the periphery of the tank plate 530. It extends in a plane substantially parallel to the plane of the tank plate and in a manner offset towards the outside thereof, and results from a cut in the tank plate 530 inducing the formation of a light 5304 in the tank plate 530. In this case, the tongue does not consist of an additional amount of 530. On the contrary, it is formed from a part of the wall of the tank plate 530. This implementation therefore makes it possible to reduce the amount of material used to make a plate of reservoir and its tongue, and thus reduce the cost of material necessary for the manufacture of the evaporator.

The tongue 5302 is inserted inside the filling tube 8 over a distance of at least one millimeter. It essentially forms an "L" with a first flange 5302i substantially parallel to the plane of the tank plate 530 and introduced at least partly into the filler tube 8, and a second flange 53022 substantially perpendicular to the first 5302 !. These two wings are connected by a folding zone 5306.

The tongue 5302 makes it possible to close the opening 85 at the second end 82 of the filling tube 8 and to hold it in a more secure position and thus to avoid the separation of the filling tube 8 and the tank plate 530. and the appearance of leakage at their junction.

The tube plates 510, 511, the tank plates 530, the outer spacers 53 and the filling tubes 8 are made of metal, for example aluminum alloy or other.

These elements, except the filling tubes 8, are made of clad metal. In other words, they are coated with a filler metal necessary for their assembly by brazing.

The filling tubes 8 are preferably made of uncladed metal. This is particularly the case when they are produced at least partly by extrusion.

After filling a tank of material with phase change, the filling opening 81 is closed by means of a plug 9.

As will become clearer from the following description of a method of manufacturing an evaporator according to the invention, all the elements that make up the evaporator are secured to each other in a sealed manner by brazing. 6.2. Manufacturing process

The manufacture of an evaporator according to the invention obviously comprises a preliminary step 190 of collecting all of the components of the component, in particular tube plates 510, 511, internal spacers 512, external spacers 52, tank plates 530, tubes filling 8.

A tank plate 530 and its tongue 5302 are obtained by stamping the same sheet metal clad so that they form a single piece monoblock.

After stamping, the tongue preferentially forms with the main plane of the tank plate an angle substantially equal to 90 °. It could nevertheless form with it an angle of 180 ° or less, or an angle less than 90 °.

Tab 5302 includes a folding area, for example a mechanically weaker fold line 5306, to facilitate its folding as will become more clearly apparent thereafter.

This folding zone 5306 is provided at a distance from the bearing surface 5307 of the tank plate 530 against which the lateral wall 83 of the filling tube 8 abuts. This distance is chosen so that when the tongue is folded substantially parallel to the tank plate 530 and is located inside the end of the filler tube 8, the side wall 83 thereof is in contact with the bearing surface 5307.

In the embodiment in which the tongue does not protrude at the periphery of the tank plate, but results from a cutting of the wall thereof, this cutting phase of the tongue can be performed during the stamping.

The tank plate includes a flange 5308 around each insertion port 5303 which protrudes from the surface of the bearing surface 5307.

A filling tube 8 is obtained from a metal tube produced "per kilometer" by extrusion. The extrusion process does not make it possible to work with clad metals. The filling tubes are made of uncladed metal. It results from the cutting of a tube section and the flattening of one of their end, for example by stamping. Obtaining the tube plates 510, 511, internal spacers 512 and outer 52, and tank plates is conventional and is not described in more detail here.

A fill tube 8 is pre-assembled to each tank plate 530 (step 191).

Such pre-assembly comprises: a step 1910 for fitting the second end 83 of the filling tube 8 along the tongue 5302 by inserting the tongue through the opening 85 over at least one millimeter; a step 1912 of placing the filling port (s) 84 of the filling tube 8 in communication with the introduction orifice (s) 5303 of the tank plate 530.

In the case of a collapsible peripheral tongue, the step of fitting is followed by a step 1911 of folding the tongue 5302 along the fold line 5306 about 90 ° until the side wall 83 tube 8 is in abutment against the tank plate 530, in this case its surface 5307. The second flattened end 82 of the filling tube is then in the reservation 5305.

The folding and communicating steps take place essentially concomitantly, the tongue being configured to bring, at the end of its folding, the filling orifice (s) of the filling tube in communication with the orifices of introduction of the tank plate. The step of placing the filling orifice (s) 84 of the filling tube 8 in communication with the orifices for introducing the tank plate 530 comprises the introduction of the corresponding collar 5308 inside the orifice filling 84 corresponding.

The filling tube 8 is thus held in position on the tank plate due to the implementation of the tongue and the flanges. The presence of the collars improves the pre-assembly and in particular ensures the maintenance of a good alignment between the orifice (s) filling and orifice (s) introduction. However, they may not be implemented in a simplified version.

The pre-assembly of a filling tube to a tank plate makes it possible to obtain a homogeneous and manipulable subassembly by an operator without risk of relative displacement of the filling tube with respect to the tank plate.

The pre-assembly of the entire evaporator is then carried out (step 192).

This pre-assembly consists in stacking a plurality of tubes 51 against each other, each tube consisting of the stack of two tube plates 510, 511 with the appropriate interposition of an internal spacer 512. Some of the spaces between consecutive tubes 51 are filled with an outer spacer 52 or with a tank plate. This assembly is maintained pre-assembled by means of a tool provided for this purpose which keeps the various components of the evaporator slightly compressed against each other.

This pre-assembled assembly is then introduced into an oven inside which is implemented a soldering step 193 without filler metal. At the end of this brazing, the various components of the evaporator, including the filler tubes and the tank plates, are secured to each other in a sealed manner and the evaporator is removed from the furnace.

The filler metal of the tongue 5302 makes it possible to braze the tube on the tongue and to seal the opening 85. The tank plate and its tongue being clad on their two faces, this brazing of the tube filling on the tongue is obtained on both sides. The filler metal of the tank plate 530 makes it possible to braze the tube on the tank plate and to seal the contours of the filling orifices 84 and the introduction orifices 5303 in order to ensure a tight connection. filling tube on the tank plate.

The implementation of the tongue makes it possible to effectively seal the opening 85 at the second end 82 of the filling tube and to reinforce the mechanical strength of the connection between the filling tube and the tank plate.

The process then preferably comprises, in a conventional manner, a test step 194 which consists in checking the imperviousness of the evaporator.

The method then comprises a step 195 for filling the reservoir (s) with phase change material 53. This step consists of injecting, for example by vacuum drawing, a phase-change material inside each tank 53 via the filling tube 8 corresponding. This material flows into each filler pipe from its filler opening 81 and flows through the filler and introduction ports until it expands into the tanks 53. Each tank 53 is then closed by means of a plug 9 closing the filler opening 81 during a shutter step 196.

Claims (14)

1. A method of manufacturing a heat exchanger (5) comprising a heat exchange bundle delimiting a coolant circulation circuit, said heat exchange bundle comprising at least one tube (51) for circulating said coolant, the heat exchanger (5) comprising at least one phase change material tank (53) in thermal contact with an outer face of said at least one tube (51), said tank (53) being delimited by at least one plate reservoir (530) traversed by at least one phase change material introducing orifice (5303) and an opposite surface, said reservoir (53) comprising a filling tube (8) comprising a side wall (83) traversed by at least one filling orifice (84) cooperating with said at least one insertion orifice (5303) of said tank plate (530), said tank plate (530) comprising a tab (5302) for holding and sealing of an end of said fill tube (8), said method comprising: a step (1910) of fitting one end (82) of said fill tube (8) along said tongue (5302); a step (1912) of placing said at least one filling orifice (84) of said filling tube (8) in communication with said at least one introduction orifice (5303) of said tank plate (530); a step (193) for securing said filling tube (8) to said tank plate (530) by welding. 2. Method according to claim 1 wherein said step (1912) of placing said at least one filling orifice (84) of said filling tube (8) in communication with said at least one introduction orifice (5303) of said plate reservoir (530) comprises inserting, within said at least one fill port (84), a flange (5308) projecting from the surface (5307) of said tank plate (530) around said at least one introduction port (5303). 3. The method of claim 1 or 2 wherein said step (1910) of fitting is followed by a step (1911) of folding of said tongue (5302) until the side wall (83) of said tube filling (8) bears against said tank plate (530). 4. The method of claim 3 wherein said folding steps (1911) and communication (1912) take place substantially concomitantly, said tongue (5302) being configured to cause, at the end of its folding, said at least one a fill port (84) of said fill tube (8) in communication with said at least one introduction port (5303) of said tank plate (530). 5. Method according to any one of claims 1 to 4 wherein said step (193) for joining by welding is of the type without filler metal, said tank plate (530) being made of metal clad and said filling tube (8) uncladed metal. 6. Method according to any one of claims 1 to 5 wherein said step (1910) fitting comprises inserting said tongue (5302) inside said filling tube (8) over a length of at least one millimeter. 7. Method according to any one of claims 2 to 6 wherein said folding step (1911) comprises folding said tongue (5302) to said tank plate (530) substantially 180 °, preferably substantially 90 °. 8. Method according to any one of claims 1 to 7 comprising a step of applying said tank plate (530) associated with said filler tube (8) against the outer surface of said tube (51) of said exchange beam thermal, this outer surface constituting said opposite surface. 9. Heat exchanger (5) comprising a heat exchange bundle delimiting a coolant circulation circuit, said heat exchange bundle comprising at least one tube (51) for circulating said coolant, said heat exchanger (5). ) comprising at least one reservoir of phase change material (53) in thermal contact with an outer face of said at least one tube (51), said reservoir (53) being delimited by at least one tank plate (530) traversed by at least one phase change material introduction port (5303) and an opposing surface, said reservoir (53) comprising a fill tube (8) including a side wall (53) bearing against said tank plate (530); ), said side wall (83) being traversed by at least one filling orifice (84) cooperating with said at least one insertion orifice (5303) of said tank plate (530), characterized in that said plate reservoir (530) comprises a tongue (5302) for holding and sealing said filling tube (8), said tongue (5302) being at least partly inserted inside said filling tube (8) from one end (82) of it. 10. heat exchanger (5) according to claim 9 wherein the insertion length of said tongue (5302) in said filler tube (8) is at least equal to 1 millimeter. 11. Heat exchanger (5) according to claim 9 or 10 wherein said filler tube (8) comprises at a first end (80) a filling orifice (81) and at a second end (82) an opening (85). ), said tongue (5302) being introduced through said opening (85). The heat exchanger (5) according to any one of claims 9 to 11 wherein said at least one fill port (84) houses a flange (5308) projecting from the surface (5307) of said tank plate ( 530) around said at least one insertion orifice (5303). 13. Heat exchanger according to any one of claims 9 to 12 wherein said tongue (5302) is folded inside said filler tube (8) and extends substantially parallel to said tank plate (530). 14. Heat exchanger according to any one of claims 9 to 13 wherein said tank of phase change material (53) is delimited by the tank plate (530) contiguous to said at least one tube (51) of said beam. heat exchange, the opposite surface being formed by the outer face of said at least one first tube (51).