HEAT EXCHANGER DEVICE AND METHOD FOR CONNECTING THE DEVICE

Description

FIELD OF INVENTION

[0001] The invention relates to the field of heat exchange devices, and in particular to heat exchange devices that can be used in the automotive sector. More specifically, the present invention relates to a heat exchange device and a method for connecting a heat exchange plate. TECHNOLOGICAL BACKGROUND OF THE INVENTION

[0002] Battery packs for motor vehicles are generally composed of elementary cells attached to a chassis and coupled to heat exchange means configured to regulate the temperature (heating or cooling) of the elementary cells when they are in operation.

[0003] These heat exchange methods may include heat exchange plates providing a fluid circulation channel in which a heat transfer fluid is likely to circulate.

[0004] The heat exchangers are also connected to an external fluid circuit. Specifically, this connection uses fittings. These fittings are generally crimped, welded, or brazed onto the surface of the heat exchange plates.

[0005] In this regard, documents WO2020 / 254757 A1, WO2020 / 031221 A1, and FR2832790 A1 disclose a method for connecting a heat exchanger to an external heat exchange circuit by means of a connecting fitting. This connecting fitting, in addition to its specific configuration, can be welded or bonded to a plate of the heat exchanger. Document US2021 / 270546 discloses a device according to the preamble of claim 1.

[0006] However, the solutions proposed in the aforementioned documents are not satisfactory. Indeed, the methods considered for attaching a connection fitting to a heat exchanger remain complicated to implement without necessarily fully meeting the requirements for temperature resistance, sealing, or mechanical strength.

[0007] One aim of the present invention is therefore to propose a heat exchange device provided with a connection nozzle whose fixing conforms to the requirements in terms of temperature resistance, sealing or mechanical resistance.

[0008] Another objective of the present invention is also to propose a method of fluidic connection of a conduit, by means of a connecting nozzle, simple to implement and conforming to the requirements in terms of temperature resistance, sealing or mechanical resistance. BRIEF DESCRIPTION OF THE INVENTION

[0009] The objectives of the present invention are, at least in part, achieved by a heat exchange device according to claim 1.

[0010] According to one method of implementation, the adhesive substance mechanically, advantageously chemically, and in a watertight manner, bonds the assembly area with the connection area.

[0011] According to one implementation method, the nozzle also includes a peripheral wedge projecting from the connection area and which circumscribes the connection area so as to delimit, with the internal wedge, the adhesion volume.

[0012] According to one embodiment, a seal, advantageously an O-ring or a lip seal, is disposed in a groove, formed on the connecting face, and interposed between the opening and the internal wedge, said internal wedge being interposed between the adhesive substance and the groove, advantageously the seal is in a compressed state in a range of 10% to 35% relative to its free volume.

[0013] According to one embodiment, the ratio between the surface of the connection area and the surface of the orifice is adjusted so that the assembly of the connection face with the assembly area has a tensile strength greater than 1 MPa, advantageously greater than 1.6 MPa, even more advantageously greater than 4.3 MPa.

[0014] According to one embodiment, the ratio between the surface of the connection area and the surface of the orifice is adjusted so that the assembly of the connection face with the assembly area presents a seal when a fluid circulates at a pressure greater than 1 bar, advantageously greater than 3 bar, even more advantageously greater than 7 bar.

[0015] The invention also relates to a motor vehicle equipped with a battery pack coupled to the heat exchange device according to the present invention, for the purpose of thermal regulation of the battery pack by said heat exchange device.

[0016] The invention also relates to a method of fluidic connection of a conduit, according to claim 8.

[0017] According to one implementation method, said process includes a heat treatment step d) intended to crosslink the adhesive substance.

[0018] According to one implementation method, step c) is preceded by a step c0) which includes the positioning of a seal, in particular an O-ring or a lip seal, in a groove formed on the connecting face, and interposed between the opening and the connecting area.

[0019] According to one embodiment, step c) of assembly includes the application of a force, called assembly force, adapted to maintain the joint compressed in a range of 10% to 35% until a predetermined level of crosslinking of the adhesive substance is reached, the predetermined crosslinking being a crosslinking that allows the compression of the joint to be maintained at a compression level between 10% and 35% as soon as the assembly force is no longer applied.

[0020] According to one embodiment, the ratio between the surface of the connection zone and the surface of the orifice is adjusted so that the assembly of the connection face with the assembly zone, at the end of step d), has a tensile strength greater than 1 MPa, advantageously greater than 1.6 MPa, even more advantageously greater than 4.3 MPa.

[0021] According to one embodiment, the ratio between the surface area of ​​the connection zone and the surface area of ​​the orifice is adjusted so that the assembly of the connection face with the assembly zone, at the end of step d) exhibits a seal when circulating a fluid at a pressure greater than 1 bar, advantageously greater than 3 bar, even more advantageously greater than 7 bar.

[0022] According to one implementation method, the first preparation step includes the removal of a layer of native aluminum oxide that may be present on the assembly area, and the adjustment of the roughness of said assembly area in a roughness range between 1.4 µm and 2.6 µm, advantageously greater than 1.9 µm, the first step implementing a LASER process or a mechanical abrasion process.

[0023] According to one implementation method, the first preparation step includes the formation of an adhesion layer on the assembly area; advantageously, the adhesion layer is formed according to at least one of the following sub-steps: anodizing or chemical conversion of the assembly zone, the formation of a Ti / Zr layer on the assembly zone.

[0024] According to one embodiment, said process includes a second step b0) surface preparation of the connecting face and carried out before step b), the second step b0) includes a plasma treatment and / or a chemical treatment and / or a laser treatment suitable to give the connecting face a surface energy greater than 36 mN / m, advantageously greater than 50 mN / m. Brief description of the drawings

[0025] Other features and advantages of the invention will become apparent from the detailed description that follows, with reference to the accompanying figures in which: [ Fig.1 ] There [ Fig.1 ] is a schematic representation of a heat exchange plate implemented in the connection method according to the present invention; [ Fig. 2 ] There [ Fig. 2] is a schematic representation of a connecting end fitting that can be used in the connection process according to the present invention; in particular, the connecting end fitting is represented in a cross-sectional plane passing through the axis XX'; [ Fig.3 ] There [ Fig.3 ] is a schematic diagram illustrating the formation of an adhesion layer, particularly on this [ Fig.3 ], the heat exchange plate is shown in a cross-section perpendicular to the assembly face and passing through the orifice; [ Fig. 4 ] There [ Fig. 4 ] is a schematic representation of the execution of step b) corresponding to the deposition of an adhesive substance on a connection area of ​​the connecting tip shown in the [ Fig. 2 ], in particular, the connecting end is represented according to a cutting plane passing through the axis XX'; [ Fig. 5 ] There [ Fig. 5] is a schematic representation of the execution of step c) corresponding to the assembly of the connection zone with the adhesion zone, in particular the connection end and the heat exchange plate are represented according to a cutting plane passing through the axis XX'; [ Fig. 6 ] There [ Fig. 6 ] is a schematic representation relating to the execution of a step c0) on a connecting end fitting provided with a groove intended to house a seal, in particular the connecting end fitting is represented according to a cutting plane passing through the axis XX'; [ Fig. 7 ] There [ Fig. 7 ] is a schematic representation of the execution of step c) corresponding to the deposition of an adhesive substance on a connection area of ​​the connecting tip shown in the [ Fig. 6 ], in particular the connecting end and the heat exchange plate are represented according to a cutting plane passing through the axis XX'. DETAILED DESCRIPTION OF THE INVENTION

[0026] The present invention relates to a heat exchange device. More particularly, the heat exchange device comprises a main element having a substantially flat assembly face, comprising aluminium, and providing a fluid circulation channel opening through an orifice disposed on the assembly face of said main element.

[0027] The heat exchange device also includes a connection fitting comprising a flat connection base.

[0028] In particular, the connection base includes a face, called the connection face, through which an opening of a connection channel emerges.

[0029] The connecting base is, in this respect, assembled with the main body, by means of an adhesive substance bonding an assembly area of ​​the assembly face, peripheral to the orifice, with a connection area of ​​the connection face and peripheral to the opening, the opening and the orifice being in correspondence with each other.

[0030] According to the present invention, the adhesive substance comprises either an epoxy glue or a polyurethane glue or an acrylic glue or a hybrid glue, the hybrid glue comprising at least two chemical functions selected from the epoxy function, the cyanoacrylate function, the acrylic function, the polyurethane function.

[0031] The main component may include a heat exchange plate, a beam, or a diffuser. The following description will be limited to the consideration of a heat exchange plate. However, those skilled in the art can adapt the principles described below to other components such as a beam or a diffuser.

[0032] The invention also relates to a method for connecting a conduit, by means of a connecting fitting, to a main component. The main component is notably provided with a predominantly flat assembly face and comprises aluminum.

[0033] The main component is also provided with a fluid circulation channel opening through an orifice located on the assembly face. The connecting fitting includes a flat base, called the connecting base. The connecting base includes a face, called the connecting face, through which opens an opening of a channel, called the connecting channel, of said connecting fitting.

[0034] The method, according to the present invention, comprises performing the following steps: a) a first step of surface preparation of a peripheral assembly area to the orifice, the first step comprising laser treatment and / or abrasion treatment and / or chemical treatment; b) a step of deposition of an adhesive substance on one and / or the other of the assembly area and a connecting area of ​​the connecting face and peripheral to the opening, the adhesive substance comprising either an epoxy adhesive or a polyurethane adhesive or an acrylic adhesive or a hybrid adhesive, the hybrid adhesive comprising at least two chemical functions from among the epoxy function, the cyanoacrylate function, the acrylic function, the polyurethane function; c) a step of assembly of the assembly area and the connecting face.

[0035] To the [ Fig.1 ], we can see a partial representation of a heat exchange plate 10. The heat exchange plate 10 comprises aluminum.

[0036] The heat exchange plate 10 is in particular a plate of a heat exchanger, and which defines a fluid circulation channel opening through an orifice 11 at the level of an assembly face 12 of the heat exchange plate 10.

[0037] To the [ Fig. 2 ], we can see a schematic representation of a connecting fitting 20 intended to be fixed to the heat exchange plate.

[0038] In particular, the connecting end fitting 20 comprises a main body 21 which is generally cylindrical in shape and terminates at one of its ends by a base, called the connecting base 22. The connecting end fitting 20 comprises a channel, called the connecting channel 23, which extends in a direction defined by an axis of revolution XX' of the main body 21, and which opens through an opening 24 arranged on a face, called the connecting face 25 of the connecting base 23.

[0039] The method according to the present invention includes a first step a) of surface preparation of an assembly area 13 peripheral to the orifice 11.

[0040] The extent and / or characteristics of the assembly area 13 will be discussed later in the statement of the present invention.

[0041] According to the present invention, the first step a) of surface preparation can be carried out by means of laser treatment and / or abrasion treatment and / or chemical treatment and / or chemical conversion.

[0042] It is understood that a surface treatment makes it possible to decontaminate the assembly area 13 to give it a surface energy and / or a particular chemical state, and in particular compatible with the implementation of an adhesive substance which will be described in the rest of the description of the present invention.

[0043] The native aluminum oxide layer remains uncontrollable. In particular, it may exhibit limited adhesion and consequently form a zone of weakness. Therefore, according to a specific implementation method, the first step (a) can be performed to remove a native aluminum oxide layer that may be present in the assembly area. It is understood that the removal of the aluminum oxide layer during the execution of the first step is effective only in the assembly area.

[0044] A particularly advantageous aspect of using a laser process is the growth, during the removal of the native aluminum oxide layer, of a new aluminum oxide layer with a controlled thickness and texture. In this regard, the laser process may involve illumination with laser radiation of a wavelength λ between 900 nm and 1550 nm, for example, 1064 nm, and a fluence between 5 J / cm² and 134 J / cm², advantageously between 5 J / cm² and 15 J / cm². The laser used may be a pulsed laser or a continuous-wave laser.

[0045] According to this implementation method, the first step a) can be performed to adjust the roughness of the assembly area within a range of Ra roughnesses between 1.4 µm and 2.6 µm, advantageously greater than 1.9 µm. This roughness is advantageously measured using a pointed roughness tester, for example, the Marsurf PS10 roughness tester with a PHT 6-350 probe and equipped with a 2 µm tip. The measurement parameters are as follows: Measurement speed: 1.0 mm / s Measurement length: 10 mm Measurement force: 0.75 mN Standard followed: DIN EN ISO 4287

[0046] According to another implementation method illustrated in the [ Fig.3 The first preparation step (a) may also include the formation of an adhesion layer 14 on the assembly area. It is understood that the formation of the adhesion layer may be limited to the assembly area 11 only.

[0047] According to one alternative, the adhesion layer 14 is formed by performing an anodizing, for example selective, of the assembly area. According to another alternative, the adhesion layer may consist of the formation of a Ti / Zr layer on the assembly area 11. Also as an alternative, the chemical treatment may include a chemical conversion treatment.

[0048] The joining method according to the present invention also includes a step b) of depositing an adhesive substance on one and / or the other of the assembly area 13 and a joining area 26 of the joining face 25 and peripheral to the opening 24.

[0049] The adhesive substance comprises either an epoxy glue, a polyurethane glue, an acrylic glue, or a hybrid glue, the hybrid glue comprising at least two chemical functions from among the epoxy function, the cyanoacrylate function, the acrylic function, the polyurethane function.

[0050] There [ Fig. 4 ] illustrates, in this respect, the deposition of the adhesive substance 27 on the connection area 26.

[0051] Advantageously, the connection zone 26 can be internally delimited by an internal wedge 28. In particular, the internal wedge 28 is projecting from the connection zone 27 and is circumscribed by said connection zone. For example, the internal wedge is annular or oblong in shape.

[0052] Also advantageously, the connection zone 26 can also be externally delimited by a peripheral wedge 29 projecting from the connection zone 26 and which circumscribes the connection zone 26.

[0053] There [ Fig. 5 ] is a schematic representation of a step c) of assembly of the assembly area and the connection area.

[0054] During this assembly step c), the opening 24 and the orifice 11 are aligned with each other, and the adhesive substance 27 spreads to fill a space between the assembly area 13 and the connection area 26. The application of the adhesive substance 28 thus makes it possible to mechanically, advantageously chemically, and hermetically bond the assembly area 13 with the connection area 26.

[0055] By "sealed", we mean sealed against a coolant, and in particular against a coolant that may contain glycol.

[0056] In this respect, the implementation of the internal wedge 28 and the peripheral wedge 29 also makes it possible to define a volume, called the adhesion volume 30 ([ Fig. 5]), between the joining zone 26 and the assembly zone 13, and in which the adhesive substance 27 is intended to be contained. In other words, the internal spacer 28 and the peripheral spacer 29 limit the volume into which the adhesive substance can spread during the execution of either of steps b) and c). In particular, the internal spacer 28 and the peripheral spacer 29 limit the overflow of adhesive substance 27 that may occur during the execution of step c).

[0057] In addition, the internal wedge 28 allows the opening to be isolated from the adhesion volume and, consequently, from the adhesive substance 27.

[0058] Furthermore, it is understood that the internal wedge 28 and the peripheral wedge 29 are in contact with the assembly face 12 at the end of step c).

[0059] According to a particularly advantageous embodiment, it is possible to consider only the internal wedge 28 (device without a peripheral wedge 29). This latter configuration thus provides a flow (and / or creep) path for the adhesive substance other than towards the opening 24.

[0060] According to another particularly advantageous embodiment, it is possible to consider a discontinuous peripheral wedge 29 (open, for example in the form of a crenellation) so as to provide a flow (and / or creep) path for the adhesive substance other than towards the opening 24.

[0061] In a particularly advantageous embodiment, the adhesive substance may comprise beads, for example glass beads, whose dimensions (it is understood that these are average dimensions) are adapted to impose a predetermined distance between the joining zone 26 and the assembly zone 13. It is understood that if the beads in question were spherical, their dimensions would be equal to their diameter. This particular embodiment may be considered alone or in combination with one or both of the internal and peripheral spacers.

[0062] Furthermore, the connecting end 20 may include, extending from the main body 21 and projecting from the connecting face 25, means for guiding said connecting end 20. More particularly, the guiding means are configured to allow the opening 24 and the orifice 11 to be aligned. The guiding means may include a wedge, called a guide wedge 31, peripheral to the opening and intended to be inserted into the orifice 11. In this respect, the guide wedge 31 may have a shape conforming to the orifice 11 and / or frustoconical.

[0063] Optionally, after step c), a heat treatment step d) may be performed to accelerate the crosslinking of the adhesive substance. The details of step d), and in particular the specific heat cycle, depend on the adhesive substance in question.

[0064] The heat treatment considered for carrying out step d) may include a localized heating step. In particular, the heat treatment may include induction heating, and more specifically induction heating of the heat exchange plate 10 made, for example, of aluminum. Induction heating makes it possible, in this respect, to accelerate the crosslinking process of the adhesive substance. In particular, induction heating can be adapted to sufficiently accelerate crosslinking in a period of less than 2 minutes, advantageously less than 1 minute 30 seconds. For example, a crosslinking cycle may include a heating time followed by a cooling time. In particular, the heating time may be less than 1 minute 30 seconds, advantageously less than 1 minute. This latter aspect makes it possible to consider online control of the assembly's leak tightness, for example, leak tightness at a pressure of 3 bar.

[0065] Alternatively or in addition, both the connecting end 20 and the heat exchange plate 10 can be preheated before carrying out step c). This last point helps to compensate for any differences in thermal expansion that may occur during the execution of step d). This preheating also helps to maintain the alignment accuracy between the connecting end 20 and the heat exchange plate.

[0066] Advantageously, the ratio between the area of ​​the connection zone and the area of ​​the orifice is adjusted so that the assembly of the connection face with the assembly zone, at the end of step d), has a tensile strength greater than 1 MPa, advantageously greater than 1.6 MPa, even more advantageously greater than 4.3 MPa.

[0067] Advantageously, the ratio between the surface area of ​​the connection zone and the surface area of ​​the orifice is adjusted so that the assembly of the connection face with the assembly zone, at the end of step d) presents a seal when circulating a fluid at a pressure greater than 1 bar, advantageously greater than 3 bar, even more advantageously greater than 7 bar, for example greater than 9 bar, again for example greater than 11 bar.

[0068] The process according to the present invention may also include a second step (b0) of surface preparation of the joining face, performed before step (b). This second step (b0) comprises a plasma treatment and / or a chemical treatment and / or a laser treatment adapted to impart to the joining area a surface energy greater than 36 mN / m, advantageously greater than 50 mN / m. This latter aspect ensures better wettability of the joining area by the adhesive substance.

[0069] Surface energy can be measured with a goniometer (for example, the Krüss Mobile Surface Analyzer (MSA)). The method used involves a double droplet placed on the surface, and in particular the measurement of the contact angle of two drops of different liquids (water and diiodomethane), followed by a calculation of the surface energy of the solid.

[0070] According to a particularly advantageous embodiment which essentially retains the characteristics described above, the process according to the present invention may include the execution of a step c0). In particular, this step c0) is performed before step c). As illustrated in [ Fig. 6 Step c0) comprises positioning a seal 32 (for example, an O-ring or a lip seal) in a groove 33 formed on the connecting face and interposed between the opening and the connecting area. The seal 32 advantageously comprises at least one of the following materials: EPDM, NBR, HNBR, FKM, AEM, FVMQ, or silicone. Advantageously, the second processing step is not applied to the groove.

[0071] There [ Fig. 7[ ] is a schematic representation of step c) of assembling the assembly area and the connection area when the installation of the joint 32 is considered. In particular, step c) of assembly includes the application of a force, called the assembly force, adapted to maintain the joint compressed in a range of 10% to 35% until a predetermined level of crosslinking of the adhesive substance is reached, the predetermined crosslinking being a crosslinking that allows the compression of the joint to be maintained at a compression level between 10% and 35% as soon as the assembly force is no longer applied.

[0072] The degree of crosslinking of an adhesive depends on its chemistry and thermal history. A person skilled in the art, based on their general knowledge and the relevant chemistry, can determine the optimal conditions for achieving a given degree of crosslinking.

[0073] It is understood that the device thus obtained may be without the seal 32. Indeed, the adhesive substance 27 certainly has the function of ensuring an assembly of the different elements, but also, depending on its chemical and / or physical properties, of making the assembly watertight according to the specifications defined in this statement.

[0074] The invention also relates to a heat exchange device which essentially retains the characteristics described above.

[0075] The invention also relates to a motor vehicle equipped with a battery pack coupled to the heat exchange device according to the present invention, for the purpose of temperature regulation of the battery pack by said heat exchange device.

[0076] Of course, the invention is not limited to the embodiments described and alternative embodiments can be made without departing from the scope of the invention as defined by the claims.

Claims

1. Heat exchange device which comprises: - a main member (10) which is provided with a substantially planar assembly face (12), said member comprising aluminum and providing a fluid circulation channel which leads to a port (11) arranged on the assembly face (12) of said main member (10); - a connection end piece (20) comprising a planar connection base (22), the connection base (22) comprising a face, referred to as the connection face (25), through which an opening (24) of a connection channel (23) extends, the connection base (22) being joined to the main member (10) by means of an adhesive substance (27) which binds an assembly region (13) of the assembly face (12), which region is peripheral to the port (11), to a connection region (26) of the connection face (25), which region is peripheral to the opening (24), the opening (24) and the port (11) corresponding to one another, the adhesive substance (27) comprising an epoxy adhesive, a polyurethane adhesive, an acrylic adhesive or a hybrid adhesive, the hybrid adhesive comprising at least two chemical functions chosen from the epoxy function, the cyanoacrylate function, the acrylic function or the polyurethane function, the device being characterized in that the connection end piece comprises an internal shim (28), which is advantageously annular or oblong, projects relative to the connection region (26) and is circumscribed by said connection region (26), the internal shim (28) being configured to define a space, referred to as the adhesion space (30), between the connection region (26) and the assembly region (13), in which space the adhesive substance (27) is received.

2. Heat exchange device according to claim 1, wherein the adhesive substance (27) binds the assembly region (13) to the connection region (26) in a mechanical, advantageously chemical, and sealing manner.

3. Heat exchange device according to either claim 1 or claim 2, wherein the end piece also comprises a peripheral shim (29) which projects relative to the connection region (26) and which circumscribes the connection region (26) so as to delimit, with the internal shim (28), the adhesion space (30).

4. Heat exchange device according to any of claims 1 to 3, wherein a seal (32), advantageously an O-ring seal or a lip seal made of EPDM or silicon, is arranged in a groove (33) provided on the connection face (25), and inserted between the opening (24) and the internal shim (28), said internal shim (28) being interposed between the adhesive substance (27) and the groove (33), and the seal (32) is advantageously in a compressed state within a range of 10% to 35% with respect to the free state volume thereof.

5. Heat exchange device according to any of claims 1 to 4, wherein the ratio between the surface area of the connection region (26) and the surface area of the port (11) is adjusted so that the joint between the connection face (25) and the assembly region (13) has a tensile strength greater than 1 MPa, advantageously greater than 1.6 MPa, even more advantageously greater than 4.3 MPa.

6. Heat exchange device according to any of claims 1 to 4, wherein the ratio between the surface area of the connection region (26) and the surface area of the port (11) is adjusted so that the joint between the connection face (25) and the assembly region (13) is sealed when a fluid is circulated at a pressure greater than 1 bar, advantageously greater than 3 bar, even more advantageously greater than 7 bar.

7. Motor vehicle provided with a battery pack coupled to the heat exchange device according to any of claims 1 to 6 for the purpose of regulating the temperature of the battery pack by means of said heat exchange device.

8. Method for fluid connection of a pipe, by means of a connection end piece (20), to a main member (10) which is provided with a substantially planar assembly face (12) and comprises aluminum, said main member (10) being provided with a fluid circulation channel which leads to a port (11) arranged on the assembly face (12), the connection end piece (20) comprising a planar base, referred to as the connection base (22), the connection base (22) comprising a face, referred to as the connection face (25), through which an opening (24) of a channel, referred to as the connection channel (23), of said connection end piece (20) extends, the method comprising execution of the following steps: a) a first step of preparing the surface of an assembly region (13) which is peripheral to the port (11), the first step comprising a laser treatment and / or an abrasion treatment and / or a chemical, advantageously electro-chemical, treatment; b) a step of depositing an adhesive substance (27) on the assembly region (13) and / or on a connection region (26) of the connection face (25), which connection region is peripheral to the opening (24), the adhesive substance (27) comprising an epoxy adhesive, a polyurethane adhesive, an acrylic adhesive or a hybrid adhesive, the hybrid adhesive comprising at least two chemical functions from the epoxy function, the cyanoacrylate function, the acrylic function or the polyurethane function; c) a step of joining the assembly region (13) and the connection face (25) the method being characterized in that the connection end piece comprising an internal shim (28), which is advantageously annular or oblong, projects relative to the connection region (26) and is circumscribed by said connection region (26), the internal shim (28) being configured to define a space, referred to as the adhesion space (30), between the connection region (26) and the assembly region (13), in which space the adhesive substance (27) deposited during execution of step b) is received.

9. Fluid connection method according to claim 8, wherein said method comprises a step d) of heat treatment which is intended to cross-link the adhesive substance (27).

10. Fluid connection method according to either claim 8 or claim 9, wherein step c) is preceded by a step c0) which comprises positioning a seal (32), in particular an O-ring seal or a lip seal, in a groove (33) provided on the connection face (25) and inserted between the opening (24) and the connection region (26).

11. Fluid connection method according to claim 10, wherein joining step c) comprises applying a force, referred to as the joining force, which is suitable for keeping the seal (32) compressed in a range of 10% to 35% until a predetermined level of cross-linking of the adhesive substance (27) is reached, the predetermined cross-linking being cross-linking which makes it possible to keep the compression of the seal (32) at a compression between 10% and 35% as soon as the joining force is no longer applied.

12. Fluid connection method according to any of claims 8 to 11, wherein the ratio between the surface area of the connection region (26) and the surface area of the port (11) is adjusted so that the joint between the connection face (25) and the assembly region (13) at the end of step d) has a tensile strength greater than 1 MPa, advantageously greater than 1.6 MPa, even more advantageously greater than 4.3 MPa.

13. Fluid connection method according to any of claims 8 to 11, wherein the ratio between the surface area of the connection region (26) and the surface area of the port (11) is adjusted so that the joint between the connection face (25) and the assembly region (13) at the end of step d) is sealed when a fluid is circulated at a pressure greater than 1 bar, advantageously greater than 3 bar, even more advantageously greater than 7 bar.

14. Fluid connection method according to any of claims 8 to 13, wherein the first preparation step comprises removing a layer of native aluminum oxide which is likely to be present on the assembly region (13) and adjusting the roughness of said assembly region (13) in a roughness range between 1.4 µm and 2.6 µm, advantageously greater than 1.9 µm, the first step involving a LASER method or a mechanical abrasion method.

15. Fluid connection method according to any of claims 8 to 13, wherein the first preparation step comprises forming an adhesion layer (14) on the assembly region (13), and the adhesion layer (14) is advantageously formed according to at least one of the following sub-steps: - anodization or a chemical conversion treatment of the assembly region (13) - the formation of a layer of Ti / Zr on the assembly region (13).

16. Fluid connection method according to any of claims 8 to 15, wherein said method comprises a second step b0) of preparing the surface of the connection face (25), which is executed before step b), the second step b0) comprises a plasma treatment and / or a chemical treatment and / or a laser treatment which is suitable for giving the connection face (25) a surface energy greater than 36 mN / m, advantageously greater than 50 mN / m.