WO2019115973A1 - Heat exchanger comprising means for equalising electrical potential - Google Patents

Heat exchanger comprising means for equalising electrical potential Download PDF

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Publication number
WO2019115973A1
WO2019115973A1 PCT/FR2018/053295 FR2018053295W WO2019115973A1 WO 2019115973 A1 WO2019115973 A1 WO 2019115973A1 FR 2018053295 W FR2018053295 W FR 2018053295W WO 2019115973 A1 WO2019115973 A1 WO 2019115973A1
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WO
WIPO (PCT)
Prior art keywords
heat exchanger
tongue
electrical
storage element
plate
Prior art date
Application number
PCT/FR2018/053295
Other languages
French (fr)
Inventor
Christophe Denoual
Original Assignee
Valeo Systemes Thermiques
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Systemes Thermiques filed Critical Valeo Systemes Thermiques
Publication of WO2019115973A1 publication Critical patent/WO2019115973A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0308—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other
    • F28D1/035—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other with U-flow or serpentine-flow inside the conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/004—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using protective electric currents, voltages, cathodes, anodes, electric short-circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
    • F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
    • F28F3/044—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being pontual, e.g. dimples
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
    • F28F9/002—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core with fastening means for other structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007—Auxiliary supports for elements
    • F28F9/0075—Supports for plates or plate assemblies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/24—Safety or protection arrangements; Arrangements for preventing malfunction for electrical insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H01M10/6557—Solid parts with flow channel passages or pipes for heat exchange arranged between the cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • Heat exchanger comprising electrical potential equalization means
  • the present invention relates to the field of heat exchangers for batteries, and more particularly the batteries of a vehicle with electric and / or hybrid motorization.
  • the invention relates more particularly to heat exchangers having electric potential equalization means intended to bear against electrical vehicle modules.
  • the battery In the field of electric and hybrid vehicles, the battery is generally formed of a plurality of electrical cells forming one or more modules arranged in a protective housing to form what is called a battery pack.
  • a problem lies in the fact that during their operation, the electrical modules are caused to heat up and may thereby be damaged.
  • the battery life can decrease sharply.
  • the thermal regulation of the modules is essential in order, firstly, to maintain them in good condition to optimize their lifetime and, secondly, to ensure the reliability, autonomy, and performance of the module. vehicle.
  • This regulation of the temperature of the battery, in particular its cooling, is in particular ensured by means of a coolant, such as water or brine, which circulates in the lines of a circuit placed in the inside the battery pack housing and connecting one or more heat exchangers with thermoregulatory plates, in contact with the electric modules, so as to regulate their temperature by thermal conduction.
  • a coolant such as water or brine
  • These plate heat exchangers generally consist of two stamped metal plates brazed one on the other and delimiting, between them, an internal coolant circulation circuit.
  • the coolant can then circulate between the heat exchange plates to achieve a heat exchange to absorb the heat emitted by the modules to cool them or bring them heat if the temperature thereof is insufficient.
  • Such a tab thus makes it possible to connect / ground the electrical modules that can become accidentally electrically conductive and thus to secure the battery pack.
  • the invention aims to solve all or part of the problems of the prior art.
  • the subject of the invention is a heat exchanger of at least one electrical energy storage element, in particular for a motor vehicle, comprising a first plate and a second plate joined to each other so as to delimit an internal circuit.
  • coolant circulation system at least one of said plates being intended to come into thermal contact with said at least one electrical energy storage element
  • said heat exchanger comprising at least one electric potential equalization tab protruding from an edge of said heat exchanger and intended to come into contact with said at least one electrical energy storage element so as to prevent the formation of an electrical voltage between said heat exchanger and said at least one electrical energy storage element .
  • said at least one tongue comprises two parts arranged at least partially facing each other and configured in a geometrically similar manner, a first tongue portion projecting from an edge of said first plate and a second tongue portion projecting from an edge of said second plate.
  • the potential equalization element of the heat exchanger is in two parts arranged vis-à-vis, each plate having an element half formed integrally with the corresponding plate.
  • the potential equalization element thus has a double thickness, which makes it possible to increase its rigidity and its mechanical strength.
  • Such a tab prevents or at least greatly reduces the formation of electrical potential differences, and therefore of an electrical voltage, between the conductive bodies (heat exchanger and battery modules) of the battery pack.
  • the tongue thus makes it possible to secure the battery pack, in particular in the event of a short-circuit, by grounding the exchanger and the modules, so as to avoid any disturbance of the operation of the vehicle and to protect the operator during manipulations. battery pack (during maintenance operations in particular).
  • This approach also makes it possible to minimize the size of the tongue, while ensuring a predetermined minimum cross-section, and to simplify the integration of the heat exchanger into the battery pack.
  • such a heat exchanger requires only one type of plate for its manufacture, which reduces the complexity and assembly time, as well as the manufacturing costs of the heat exchanger.
  • said first and second parts of the tongue are joined to one another by brazing during assembly by brazing the plates together.
  • the tongue obtained can then be bent or curved to come into electrical contact with an electrical module placed in thermal contact with one of the plates of the exchanger.
  • the two tongue portions are not secured to each other, the half-tongues can be folded in opposite directions to come into electrical contact each with an electrical module placed in thermal contact with one of the plates of the exchanger.
  • said tongue has at least one contact surface with said at least one electrical energy storage element.
  • Such a contact surface makes it possible to ensure the continuity of electrical potential equalization between the heat exchanger and the battery electrical module or modules.
  • said at least one contact surface is flat or has reliefs.
  • reliefs allows the equalization tab to have an improved mechanical strength so as to be able to withstand the particular deformations that may be caused during transport and handling of the heat exchanger for example.
  • Reliefs or specific shapes provide better mechanical resistance to deformation and facilitate handling of the tabs.
  • said tongue is intended to be bent so that said at least one contact surface comes to be pressed against a face of said at least one electrical energy storage element.
  • said at least one contact surface extends perpendicularly to the planes of the plates of the heat exchanger.
  • said at least one contact surface of said tongue comprises fixing means to said at least one electrical energy storage element.
  • said tongue has a thickness of between 1 and 2 mm.
  • Such a thickness allows the potential equalization tab to have a high mechanical strength and to withstand the deformations that may be caused during transport and handling of the heat exchanger for example.
  • the heat exchanger comprises a plurality of potential equalization tongues distributed over its peripheral edge, each of the tongues consisting of two parts arranged at least partially facing each other. a first tongue portion projecting from an edge of said first plate, and a second tongue portion projecting from an edge of said second plate.
  • the heat exchanger can thus have a plurality of potential equalization tabs each intended to be secured to a separate electrical module in thermal contact with the exchanger.
  • each electrical module disposed against one of the plates of the heat exchanger is connected to an electric potential equalization element carried by the exchanger.
  • the first and second parts of the tongue are separated, the free end of said first tongue portion being intended to come into contact with a first electrical energy storage element arranged in contact with each other. with the first plate of the heat exchanger, and the free end of said second tongue portion being intended to come into contact with a second element of storage of electrical energy disposed in thermal contact with the second plate of the heat exchanger.
  • the portions of the electrical potential equalization tab may be bent in two opposite directions so as to come into contact with two separate electrical modules located on either side of the heat exchanger.
  • the invention further proposes a battery pack comprising at least one heat exchanger as described above for the regulation of at least one electric battery module.
  • said battery pack comprises at least two electric battery modules arranged on either side of a heat exchanger as described above.
  • FIG. 1 is a perspective view of a heat exchanger according to a particular embodiment of the invention.
  • FIG. 2 is an exploded view of the heat exchanger of FIG. 1;
  • FIG. 3 is a detailed view of the potential equalization tab of the heat exchanger of FIG. 1;
  • FIG. 4 is a partial view of an assembly of two battery electric modules between which the heat exchanger of FIG. 1 is arranged; and FIG. 5 illustrates a particular implementation of the invention in which two heat exchangers in accordance with the invention are each arranged between two adjacent electrical modules.
  • FIGS. 1 and 2 illustrate a heat exchanger 1 according to a particular embodiment of the invention.
  • FIG. 2 is an exploded view of the heat exchanger 1 which comprises a first plate 10a and a second plate 10b symmetrical.
  • the two plates 10a, 10b are intended to be assembled by brazing so as to delimit an internal circuit C of circulation of a coolant.
  • Each rectangular plate 10a, 10b comprises a wall 12a, 12b extending partially along the longitudinal axis of the corresponding plate.
  • the circuit C has a "U" shape, the branches of the "U” being separated by a partition 12 formed by the walls 12a, 12b.
  • Each of the plates 10a, 10b comprises studs configured to disturb the flow of the coolant and thus improve the heat exchange with the battery electrical module or modules (not shown) arranged in thermal contact with the heat exchanger 1 within the pack battery of an electric or hybrid vehicle.
  • Figure 1 is a view of the heat exchanger 1 of Figure 2 once the plates 10a, 10b assembled.
  • the heat exchanger 1 comprises a first fluidic connection flange, referred to as a fluidic supply flange, and a second fluidic connection flange, called a fluidic discharge flange, which are respectively disposed at each end of the fluidic circuit C, on the same side edge of the heat exchanger 1.
  • the supply flange 20 is configured to feed the heat transfer fluid circuit C and the discharge flange 30 is configured to discharge the heat transfer fluid from the circuit C.
  • the flanges 20, 30 of connection are intended to be coupled, in a sealed manner, with supply lines and fluid discharge respectively (not shown).
  • a tab 11 of electrical potential equalization protrudes on a second side edge of the heat exchanger 1, opposite the first edge carrying the flanges 20, 30 connection.
  • the tongue 11 of flat rectangular shape, is bent upwards and has two portions 111, 112 extending in two orthogonal planes.
  • a first portion 111 which extends in the plane of the plates 10a, 10b, is extended by a second curved portion 112, itself extended by a third end portion 113 which is perpendicular to the first portion 111.
  • the third portion 113 of the potential equalization tab 11 has a surface 114 of electrical contact with an electric battery module (not shown) which is intended to come into thermal contact with the plate 10a of the heat exchanger.
  • the tongue 11 comprises a first tongue portion 11a protruding from a side edge of the first plate 10a, and a second tongue portion 11b projecting from a side edge of the tongue. second plate 10b and coming to press against the first tongue portion 11a when the plates 10a, 10b are contiguous.
  • the first and second parts 11a, 11b of tongues thus extend facing one another and are superimposed so that the thickness of the tongue is substantially equal to the thickness of the heat exchanger 1 .
  • the first and second tongue portions 11a, 11b here have the same thickness as that of the first and second plates 10a, 10b respectively.
  • the thickness of the tongue 11 is thus greater than the tongue of the heat exchangers described in relation with the prior art, which increases its mechanical strength.
  • FIG. 3 is a detailed view of the electrical potential equalization tab 11 of the heat exchanger 1 of FIGS. 1 and 2.
  • the first and second parts 11a, 11b of the tongue 11 are pressed against each other and joined by soldering, so as to form a single tongue 11 whose thickness "e" corresponds to the sum of the thicknesses of the first and second parts 11a, 11b.
  • the thickness of the potential equalization tab 11 is greater than the tabs of the prior art so that, for an identical cross-sectional value, the width of the tab 11 is smaller compared to the width of the tabs of the tab. prior art.
  • the electric potential equalization tongue 11 has a thickness "e" of 1 mm and a width 33 mm.
  • the tongue 11 has a cross section of 33 mm 2 , the cross section corresponding to the width "I" multiplied by the thickness "e".
  • the tongue 11 is bent so that its contact surface 114 comes to press against a face of an electrical module disposed in thermal contact with a plate 11a, 11b of the heat exchanger 1.
  • the contact surface 114 extends here perpendicular to the plane of the plates 11a, 11b of the heat exchanger 1.
  • the tongue 11 has a substantially L-shaped cross-section.
  • the surface 114 of contact is planar so that it can be easily secured to a flat face of the electrical module, by laser welding or by screwing for example.
  • FIG. 4 is a view of the heat exchanger 1 when it is disposed between two battery electric modules 40, 40 'within a battery pack.
  • the heat exchanger 1 is arranged between two adjacent electrical modules 40, 40 'so that the first plate 10a is in thermal contact with a face of a first electrical module 40 and the second plate 10b is in position. thermal contact with a face of a second module 40 'electric.
  • the electric potential equalization tongue 11 is formed by brazing the first and second tongue portions 11a, 11b together.
  • the tongue 11 is bent and its contact surface 114 is disposed against a face of one of the electrical modules, in this case the first electrical module 40.
  • an outer face of the electrical module 40 is in contact with the single potential equalization tab 11 having, in this example, a cross section of 33 mm 2 .
  • the tongue 11 ensures the passage of the current of the electrical module 40 to the heat exchanger 1.
  • FIG. 5 illustrates a particular embodiment of the invention in which the first and second parts 11a, 11b of the tongue 11 of each heat exchanger 1 according to the invention, are separated (in that they are not secured to one another) so that their free ends can be spaced apart from each other.
  • a heat exchanger 1 according to the invention being disposed between two adjacent electrical modules so as to thermally regulate them.
  • Each heat exchanger 1 is thus arranged between two adjacent modules 40, 40 ', 40 "electrical.
  • the first part 11a of the tongue is bent to come into contact with a first electrical module 40 located on a first side of the exchanger 1 and the second part 11b of the tongue is curved to come into contact with a second electrical module 40 'located on a second side of the exchanger 1.
  • the first part 11a of the tongue is bent to come into contact with the second electrical module 40 'located on a first side of the exchanger 1 and the second part 11b of the tongue is bent to come into contact with a third electrical module 40 "located on a second side of the exchanger 1.
  • each heat exchanger 1 is electrically connected to two separate electrical modules through the first and second tab portions 11a, 11b which are folded in opposite directions.
  • each electrical module 40, 40 ', 40 is coupled, on one and the same face, to two separate tongue portions of separate heat exchangers.
  • each electrical module is coupled to two tongue portions each having a cross-sectional area of 16.5 mm 2 (0.5 mm thick for 33 mm width) for a potential equalization link having a total cross section of 33 mm 2 , ie the sum of the cross sections of the two tongue portions.
  • a potential equalization link having a total cross section of 33 mm 2 , ie the sum of the cross sections of the two tongue portions.
  • the plates of the heat exchanger according to the invention are made of an electrically conductive material, such as aluminum.
  • Such a material has in particular excellent properties of thermal conductivity, electrical conductivity, and resistance to corrosion, as well as a low mass.
  • each plate has a thickness of 0.5 mm.
  • each plate has a thickness of between 0.5 and 1 mm.
  • the first and second tongue portions are obtained during stamping of the first and second plates respectively.
  • each tongue portion is shaped, bent for example, before the solder assembly of the first and second plates.
  • the tongue portions are simultaneously bent after assembly of the first and second plates.
  • the tongue parts are shaped after their mutual bonding.
  • the tongue portions are shaped after joining them to at least one battery electrical module.
  • the contact surface of the tongue may have one or more openings for the passage of fastening means, in particular screws, for securing the potential equalization tab to the electrical module.
  • the contact surface of the potential equalization tongue has reliefs, such as pads, ribs or corrugations for example.
  • the heat exchanger 1 has, on one or more of its peripheral edges, several potential equalization tongues each intended to come into contact with a separate electrical module.
  • the heat exchanger may have as many tabs as there are electrical modules arranged against the two plates constituting it so as to prevent or at least reduce the differences in electrical potential between each of the electrical modules and the heat exchanger.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Battery Mounting, Suspending (AREA)
  • Secondary Cells (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

The invention concerns a heat exchanger (1) for controlling the temperature of at least one power storage element (40), in particular for a motor vehicle, comprising a first plate (10a) and a second plate (10b) that are secured together so as to delimit an internal heat transfer fluid circulation circuit (C), at least one of said plates (10a, 10b) being intended to come into thermal contact with said at least one power storage element (40), said heat exchanger (1) comprising at least one electrical potential equalising tab (11) that protrudes from one edge of said heat exchanger (1) and is intended to come into contact with said at least one power storage element (40) so as to prevent the formation of an electrical voltage between said heat exchanger (1) and said at least one power storage element (40), said at least one tab (11) consisting of two parts arranged at least partially facing each other and configured in a geometrically similar manner, a first tab part (lia) protruding from an edge of said first plate (10a), and a second tab part (11b) protruding from an edge of said second plate (10b).

Description

Echangeur thermique comprenant des moyens d'égalisation de potentiel électrique  Heat exchanger comprising electrical potential equalization means
Domaine technique de l'invention Technical field of the invention
La présente invention relève du domaine des échangeurs thermiques pour batteries, et plus particulièrement les batteries d'un véhicule à motorisation électrique et/ou hybride.  The present invention relates to the field of heat exchangers for batteries, and more particularly the batteries of a vehicle with electric and / or hybrid motorization.
L'invention concerne plus particulièrement des échangeurs thermiques possédant des moyens d'égalisation de potentiel électrique destinés à venir en appui avec des modules électriques de véhicule.  The invention relates more particularly to heat exchangers having electric potential equalization means intended to bear against electrical vehicle modules.
Etat de la technique State of the art
Dans le domaine des véhicules électriques et hybrides, la batterie est généralement formée d'une pluralité de cellules électriques formant un ou plusieurs modules disposées dans un boîtier de protection afin de former ce que l'on appelle un pack batterie.  In the field of electric and hybrid vehicles, the battery is generally formed of a plurality of electrical cells forming one or more modules arranged in a protective housing to form what is called a battery pack.
Un problème posé réside dans le fait que durant leur fonctionnement, les modules électriques sont amenées à chauffer et risquent de ce fait de s'endommager.  A problem lies in the fact that during their operation, the electrical modules are caused to heat up and may thereby be damaged.
Par ailleurs, en cas de température trop basse, l'autonomie de la batterie peut décroître fortement.  In addition, if the temperature is too low, the battery life can decrease sharply.
Par conséquent, la régulation thermique des modules est essentielle afin, d'une part, de les maintenir en bon état pour optimiser leur durée de vie et, d'autre part, d'assurer la fiabilité, l'autonomie, et la performance du véhicule.  Therefore, the thermal regulation of the modules is essential in order, firstly, to maintain them in good condition to optimize their lifetime and, secondly, to ensure the reliability, autonomy, and performance of the module. vehicle.
Cette régulation de la température de la batterie, notamment son refroidissement, est notamment assurée au moyen d'un fluide caloporteur, tel que de l'eau ou de l'eau glycolée, qui circule dans les conduites d'un circuit placées à l'intérieur du boîtier du pack batterie et reliant un ou plusieurs échangeurs thermiques à plaques thermorégulatrices, en contact avec les modules électriques, de manière à réguler leur température par conduction thermique. This regulation of the temperature of the battery, in particular its cooling, is in particular ensured by means of a coolant, such as water or brine, which circulates in the lines of a circuit placed in the inside the battery pack housing and connecting one or more heat exchangers with thermoregulatory plates, in contact with the electric modules, so as to regulate their temperature by thermal conduction.
Ces échangeurs thermiques à plaques sont généralement constitués de deux plaques métalliques embouties brasées l'une sur l'autre et délimitant, entre elles, un circuit interne de circulation de fluide caloporteur.  These plate heat exchangers generally consist of two stamped metal plates brazed one on the other and delimiting, between them, an internal coolant circulation circuit.
Le fluide caloporteur peut alors circuler entre les plaques d'échange thermique pour réaliser un échange calorifique permettant d'absorber la chaleur émise par les modules afin de les refroidir ou leur apporter de la chaleur si la température de ceux-ci est insuffisante.  The coolant can then circulate between the heat exchange plates to achieve a heat exchange to absorb the heat emitted by the modules to cool them or bring them heat if the temperature thereof is insufficient.
Par ailleurs, pour des raisons de sécurité, une isolation électrique doit être prévue entre chaque échangeur thermique et le ou les modules de batterie en contact thermique avec ce dernier.  Furthermore, for safety reasons, electrical insulation must be provided between each heat exchanger and the battery module or modules in thermal contact with the latter.
Pour l'égalisation de potentiel électrique entre l'échangeur thermique et les modules électriques, il est connu de mettre en œuvre une languette d'égalisation de potentiel électrique faisant saillie depuis un bord d'une des deux plaques de l'échangeur et qui vient en contact électrique avec le module électrique qui se trouve en contact thermique avec ce dernier.  For the equalization of electrical potential between the heat exchanger and the electrical modules, it is known to implement an electrical potential equalization tongue protruding from an edge of one of the two plates of the exchanger and which comes in electrical contact with the electrical module which is in thermal contact with the latter.
Une telle languette permet ainsi de relier/mettre à la terre les modules électriques qui peuvent devenir accidentellement conducteurs d'électricité et donc de sécuriser le pack batterie.  Such a tab thus makes it possible to connect / ground the electrical modules that can become accidentally electrically conductive and thus to secure the battery pack.
Toutefois, l'augmentation du niveau d'électrification et de la puissance électrique des véhicules actuels nécessite d'augmenter la puissance de la batterie du véhicule.  However, increasing the level of electrification and electric power of current vehicles requires increasing the power of the vehicle battery.
Une telle augmentation requiert, pour des raisons de sécurité, d'augmenter la dimension de la languette d'égalisation de potentiel des échangeurs thermiques, et en particulier leur section transversale correspondant à la largeur de la languette multipliée par son épaisseur.  Such an increase requires, for reasons of safety, to increase the size of the potential equalization tab of the heat exchangers, and in particular their cross section corresponding to the width of the tab multiplied by its thickness.
Cela entraîne toutefois des contraintes d'intégration et de fixation des échangeurs thermiques sur les modules au sein du pack batterie. Par ailleurs, une augmentation de la taille des languettes fragilise mécaniquement ces dernières et augmente les risques de déformation de ces dernières lors de leur fabrication, manipulation, transport et assemblage au module électrique correspondant. However, this entails integration and fixing constraints of the heat exchangers on the modules within the battery pack. Moreover, an increase in the size of the tabs mechanically weakens the latter and increases the risk of deformation of the latter during their manufacture, handling, transport and assembly to the corresponding electrical module.
Exposé de l'invention Presentation of the invention
L'invention a pour but de résoudre tout ou partie des problèmes de l'art antérieur.  The invention aims to solve all or part of the problems of the prior art.
A cet effet, l'invention a pour objet un échangeur thermique d'au moins un élément de stockage d'énergie électrique, notamment pour un véhicule automobile, comprenant une première plaque et une seconde plaque solidarisées entre elles de sorte à délimiter un circuit interne de circulation de fluide caloporteur, au moins une desdites plaques étant destinée à venir en contact thermique avec ledit au moins un élément de stockage d'énergie électrique, ledit échangeur thermique comprenant au moins une languette d'égalisation de potentiel électrique faisant saillie à partir d'un bord dudit échangeur thermique et destinée à venir au contact dudit au moins un élément de stockage d'énergie électrique de sorte à empêcher la formation d'une tension électrique entre ledit échangeur thermique et ledit au moins un élément de stockage d'énergie électrique.  For this purpose, the subject of the invention is a heat exchanger of at least one electrical energy storage element, in particular for a motor vehicle, comprising a first plate and a second plate joined to each other so as to delimit an internal circuit. coolant circulation system, at least one of said plates being intended to come into thermal contact with said at least one electrical energy storage element, said heat exchanger comprising at least one electric potential equalization tab protruding from an edge of said heat exchanger and intended to come into contact with said at least one electrical energy storage element so as to prevent the formation of an electrical voltage between said heat exchanger and said at least one electrical energy storage element .
Selon l'invention, ladite au moins une languette comprend deux parties disposées au moins partiellement en regard l'une de l'autre et configurées de façon géométriquement similaire, une première partie de languette faisant saillie à partir d'un bord de ladite première plaque, et une seconde partie de languette faisant saillie à partir d'un bord de ladite seconde plaque.  According to the invention, said at least one tongue comprises two parts arranged at least partially facing each other and configured in a geometrically similar manner, a first tongue portion projecting from an edge of said first plate and a second tongue portion projecting from an edge of said second plate.
Ainsi, l'élément d'égalisation de potentiel de l'échangeur thermique est en deux parties disposées en vis-à-vis, chaque plaque présentant une moitié d'élément formée d'un seul tenant avec la plaque correspondante.  Thus, the potential equalization element of the heat exchanger is in two parts arranged vis-à-vis, each plate having an element half formed integrally with the corresponding plate.
L'élément d'égalisation de potentiel présente ainsi une double épaisseur, ce qui permet d'augmenter sa rigidité et sa tenue mécanique. The potential equalization element thus has a double thickness, which makes it possible to increase its rigidity and its mechanical strength.
Une telle languette empêche ou du moins réduit fortement la formation de différences de potentiels électriques, et donc d'une tension électrique, entre les corps conducteurs (échangeur thermique et modules de batterie) du pack batterie.  Such a tab prevents or at least greatly reduces the formation of electrical potential differences, and therefore of an electrical voltage, between the conductive bodies (heat exchanger and battery modules) of the battery pack.
Elle assure une liaison électrique permanente entre ces corps conducteurs et sécurise ainsi le pack batterie, lors du fonctionnement du véhicule ou lors des opérations de montage et de maintenance.  It provides a permanent electrical connection between these conductors and thus secures the battery pack, during operation of the vehicle or during assembly and maintenance operations.
La languette permet donc de sécuriser le pack batterie, notamment en cas de court-circuit, par la mise à la masse de l'échangeur et des modules, de sorte à éviter toute perturbation du fonctionnement du véhicule et protéger l'opérateur lors des manipulations du pack batterie (lors des opérations de maintenance notamment).  The tongue thus makes it possible to secure the battery pack, in particular in the event of a short-circuit, by grounding the exchanger and the modules, so as to avoid any disturbance of the operation of the vehicle and to protect the operator during manipulations. battery pack (during maintenance operations in particular).
Cette approche permet en outre de minimiser l'encombrement de la languette, tout en assurant une section transversale minimale prédéterminée, et de simplifier l'intégration de l'échangeur thermique dans le pack batterie.  This approach also makes it possible to minimize the size of the tongue, while ensuring a predetermined minimum cross-section, and to simplify the integration of the heat exchanger into the battery pack.
Par ailleurs, un tel échangeur thermique ne nécessite qu'un seul type de plaques pour sa fabrication, ce qui permet de réduire la complexité et le temps d'assemblage, ainsi que les coûts de fabrication de l'échangeur thermique.  Moreover, such a heat exchanger requires only one type of plate for its manufacture, which reduces the complexity and assembly time, as well as the manufacturing costs of the heat exchanger.
Selon un aspect particulier de l'invention, lesdites première et seconde parties de la languette sont solidarisées l'une à l'autre par brasage lors de l'assemblage par brasage des plaques entre elles.  According to a particular aspect of the invention, said first and second parts of the tongue are joined to one another by brazing during assembly by brazing the plates together.
La languette obtenue peut ensuite être pliée ou recourbée pour venir en contact électrique avec un module électrique placé en contact thermique avec une des plaques de l'échangeur.  The tongue obtained can then be bent or curved to come into electrical contact with an electrical module placed in thermal contact with one of the plates of the exchanger.
En outre, il n'est pas nécessaire de prévoir de couche de métal d'apport de brasage ce qui permet la fixation par soudure laser de la languette sur une face d'un module électrique en contact thermique avec l'échangeur. En variante, les deux parties de languette ne sont pas solidarisées entre elles, les demi-languettes pouvant être pliées dans des directions opposées pour venir en contact électrique chacune avec un module électrique placé en contact thermique avec une des plaques de l'échangeur. In addition, it is not necessary to provide solder metal layer which allows attachment by laser welding of the tongue on one side of an electrical module in thermal contact with the exchanger. Alternatively, the two tongue portions are not secured to each other, the half-tongues can be folded in opposite directions to come into electrical contact each with an electrical module placed in thermal contact with one of the plates of the exchanger.
Selon un autre aspect particulier de l'invention, ladite languette présente au moins une surface de contact avec ledit au moins un élément de stockage d'énergie électrique.  According to another particular aspect of the invention, said tongue has at least one contact surface with said at least one electrical energy storage element.
Une telle surface de contact permet d'assurer la continuité d'égalisation de potentiel électrique entre l'échangeur et le ou les modules électriques de batterie.  Such a contact surface makes it possible to ensure the continuity of electrical potential equalization between the heat exchanger and the battery electrical module or modules.
Selon un autre aspect particulier de l'invention, ladite au moins une surface de contact est plane ou présente des reliefs.  According to another particular aspect of the invention, said at least one contact surface is flat or has reliefs.
La mise en œuvre de reliefs permet à la languette d'égalisation de présenter une tenue mécanique améliorée de sorte à pouvoir notamment résister aux déformations pouvant être occasionnées lors du transport et de la manipulation de l'échangeur thermique par exemple.  The implementation of reliefs allows the equalization tab to have an improved mechanical strength so as to be able to withstand the particular deformations that may be caused during transport and handling of the heat exchanger for example.
Des reliefs ou formes spécifiques assurent une meilleure tenue mécanique à la déformation et facilitent la manipulation des languettes.  Reliefs or specific shapes provide better mechanical resistance to deformation and facilitate handling of the tabs.
Selon un autre aspect particulier de l'invention, ladite languette est destinée à être recourbée de sorte à ce que ladite au moins une surface de contact vienne se plaquer contre une face dudit au moins un élément de stockage d'énergie électrique.  According to another particular aspect of the invention, said tongue is intended to be bent so that said at least one contact surface comes to be pressed against a face of said at least one electrical energy storage element.
Une fois la languette pliée et plaquée, ladite au moins une surface de contact s'étend perpendiculairement aux plans des plaques de l'échangeur thermique.  Once the tab is folded and plated, said at least one contact surface extends perpendicularly to the planes of the plates of the heat exchanger.
Selon un autre aspect particulier de l'invention, ladite au moins une surface de contact de ladite languette comprend des moyens de fixation audit au moins un élément de stockage d'énergie électrique. Ainsi, la liaison d'égalisation de potentiel entre l'échangeur thermique et le module électrique assurée par le biais de la languette, est maintenue même lors de déplacements accidentels des modules électriques et/ou de l'échangeur thermique (lors du montage ou de la maintenance, par exemple). According to another particular aspect of the invention, said at least one contact surface of said tongue comprises fixing means to said at least one electrical energy storage element. Thus, the potential equalization connection between the heat exchanger and the electrical module provided by means of the tongue is maintained even during accidental movements of the electrical modules and / or the heat exchanger (during assembly or maintenance, for example).
Selon un autre aspect particulier de l'invention, ladite languette présente une épaisseur comprise entre 1 et 2 mm.  According to another particular aspect of the invention, said tongue has a thickness of between 1 and 2 mm.
Une telle épaisseur permet à la languette d'égalisation de potentiel de présenter une tenue mécanique élevée et de résister aux déformations pouvant être occasionnées lors du transport et de la manipulation de l'échangeur thermique par exemple.  Such a thickness allows the potential equalization tab to have a high mechanical strength and to withstand the deformations that may be caused during transport and handling of the heat exchanger for example.
Selon une mise en œuvre particulière de l'invention, l'échangeur thermique comprend plusieurs languettes d'égalisation de potentiel réparties sur son bord périphérique, chacune des languettes étant constituée de deux parties disposées au moins partiellement en regard l'une de l'autre, une première partie de languette faisant saillie à partir d'un bord de ladite première plaque, et une seconde partie de languette faisant saillie à partir d'un bord de ladite seconde plaque.  According to one particular embodiment of the invention, the heat exchanger comprises a plurality of potential equalization tongues distributed over its peripheral edge, each of the tongues consisting of two parts arranged at least partially facing each other. a first tongue portion projecting from an edge of said first plate, and a second tongue portion projecting from an edge of said second plate.
L'échangeur thermique peut ainsi présenter plusieurs languettes d'égalisation de potentiel destinées chacune à être solidarisée à un module électrique distinct en contact thermique avec l'échangeur.  The heat exchanger can thus have a plurality of potential equalization tabs each intended to be secured to a separate electrical module in thermal contact with the exchanger.
Ainsi, chaque module électrique disposé contre une des plaques de l'échangeur thermique est relié à un élément d'égalisation de potentiel électrique porté par l'échangeur.  Thus, each electrical module disposed against one of the plates of the heat exchanger is connected to an electric potential equalization element carried by the exchanger.
Selon un autre aspect particulier de l'invention, les première et seconde parties de la languette sont séparées, l'extrémité libre de ladite première partie de languette étant destinée à venir en contact avec un premier élément de stockage d'énergie électrique disposé en contact thermique avec la première plaque de l'échangeur thermique, et l'extrémité libre de ladite seconde partie de languette étant destinée à venir en contact avec un deuxième élément de stockage d'énergie électrique disposé en contact thermique avec la deuxième plaque de l'échangeur thermique. According to another particular aspect of the invention, the first and second parts of the tongue are separated, the free end of said first tongue portion being intended to come into contact with a first electrical energy storage element arranged in contact with each other. with the first plate of the heat exchanger, and the free end of said second tongue portion being intended to come into contact with a second element of storage of electrical energy disposed in thermal contact with the second plate of the heat exchanger.
Les parties de la languette d'égalisation de potentiel électrique peuvent être pliées dans deux directions opposées de sorte à venir en contact avec deux modules électriques distincts situés de part et d'autre de l'échangeur thermique.  The portions of the electrical potential equalization tab may be bent in two opposite directions so as to come into contact with two separate electrical modules located on either side of the heat exchanger.
Une telle configuration permet d'assurer la continuité d'égalisation de potentiel électrique entre chaque échangeur et les modules électriques de batterie disposés de part et d'autre de ce dernier.  Such a configuration makes it possible to ensure the continuity of equalization of electrical potential between each exchanger and the battery electrical modules arranged on either side of the latter.
L'invention propose en outre un pack-batterie comprenant au moins un échangeur thermique tel que décrit précédemment pour la régulation d'au moins un module de batterie électrique.  The invention further proposes a battery pack comprising at least one heat exchanger as described above for the regulation of at least one electric battery module.
Selon un aspect particulier de l'invention, ledit pack-batterie comprend au moins deux modules de batterie électrique disposés de part et d'autre d'un échangeur thermique tel que décrit précédemment.  According to a particular aspect of the invention, said battery pack comprises at least two electric battery modules arranged on either side of a heat exchanger as described above.
Liste des figures List of Figures
D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lecture de la description suivante d'un mode de réalisation, donné à titre de simple exemple illustratif et non limitatif, et des dessins annexés, parmi lesquels :  Other features and advantages of the invention will emerge more clearly on reading the following description of an embodiment, given as a simple illustrative and nonlimiting example, and the appended drawings, among which:
- la figure 1 est une vue en perspective d'un échangeur thermique selon un mode de réalisation particulier de l'invention ;  - Figure 1 is a perspective view of a heat exchanger according to a particular embodiment of the invention;
- la figure 2 est une vue éclatée de l'échangeur thermique de la figure 1 ; FIG. 2 is an exploded view of the heat exchanger of FIG. 1;
- la figure 3 est une vue de détail de la languette d'égalisation de potentiel de l'échangeur thermique de la figure 1 ; FIG. 3 is a detailed view of the potential equalization tab of the heat exchanger of FIG. 1;
- la figure 4 est une vue partielle d'un assemblage de deux modules électriques de batterie entre lesquelles est disposé l'échangeur thermique de la figure 1 ; et - la figure 5 illustre une mise en œuvre particulière de l'invention dans laquelle deux échangeurs thermiques conformes à l'invention sont chacun disposés entre deux modules électriques adjacents. FIG. 4 is a partial view of an assembly of two battery electric modules between which the heat exchanger of FIG. 1 is arranged; and FIG. 5 illustrates a particular implementation of the invention in which two heat exchangers in accordance with the invention are each arranged between two adjacent electrical modules.
Description détaillée de l'invention Detailed description of the invention
Les figures 1 et 2 illustrent un échangeur thermique 1 selon un mode de réalisation particulier de l'invention.  Figures 1 and 2 illustrate a heat exchanger 1 according to a particular embodiment of the invention.
La figure 2 est une vue éclatée de l'échangeur thermique 1 qui comprend une première plaque 10a et une deuxième plaque 10b symétriques.  Figure 2 is an exploded view of the heat exchanger 1 which comprises a first plate 10a and a second plate 10b symmetrical.
Les deux plaques 10a, 10b sont destinées à être assemblées par brasage de sorte à délimiter un circuit C interne de circulation d'un fluide caloporteur.  The two plates 10a, 10b are intended to be assembled by brazing so as to delimit an internal circuit C of circulation of a coolant.
Chaque plaque 10a, 10b rectangulaire comprend une paroi 12a, 12b s'étendant partiellement selon l'axe longitudinal de la plaque correspondante.  Each rectangular plate 10a, 10b comprises a wall 12a, 12b extending partially along the longitudinal axis of the corresponding plate.
Une fois plaques 10a, 10b assemblées l'une à l'autre, par brasage préférentiellement, le circuit C présente une forme en « U », les branches du "U" étant séparée par une cloison 12 formée par les parois 12a, 12b.  Once plates 10a, 10b assembled to one another, by brazing preferentially, the circuit C has a "U" shape, the branches of the "U" being separated by a partition 12 formed by the walls 12a, 12b.
Chacune des plaques 10a, 10b comprend des plots configurés pour perturber l'écoulement du fluide caloporteur et ainsi améliorer les échanges thermiques avec le ou les modules électriques de batterie (non illustrés) disposés en contact thermique avec l'échangeur thermique 1 au sein du pack batterie d'un véhicule électrique ou hybride.  Each of the plates 10a, 10b comprises studs configured to disturb the flow of the coolant and thus improve the heat exchange with the battery electrical module or modules (not shown) arranged in thermal contact with the heat exchanger 1 within the pack battery of an electric or hybrid vehicle.
La figure 1 est une vue de l'échangeur thermique 1 de la figure 2 une fois les plaques 10a, 10b assemblées.  Figure 1 is a view of the heat exchanger 1 of Figure 2 once the plates 10a, 10b assembled.
L'échangeur thermique 1 comprend une première bride de raccordement fluidique, dite bride d'alimentation 20 fluidique, et une seconde bride de raccordement fluidique, dite bride d'évacuation 30 fluidique, qui sont respectivement disposées à chaque extrémité du circuit C fluidique, sur un même bord latéral de l'échangeur thermique 1. La bride d'alimentation 20 est configurée pour alimenter le circuit C en fluide caloporteur et la bride d'évacuation 30 est configurée pour évacuer le fluidique caloporteur provenant du circuit C. The heat exchanger 1 comprises a first fluidic connection flange, referred to as a fluidic supply flange, and a second fluidic connection flange, called a fluidic discharge flange, which are respectively disposed at each end of the fluidic circuit C, on the same side edge of the heat exchanger 1. The supply flange 20 is configured to feed the heat transfer fluid circuit C and the discharge flange 30 is configured to discharge the heat transfer fluid from the circuit C.
Les brides 20, 30 de raccordement sont destinées à être couplées, de manière étanche, avec des conduites d'alimentation et d'évacuation fluidique respectivement (non illustrées).  The flanges 20, 30 of connection are intended to be coupled, in a sealed manner, with supply lines and fluid discharge respectively (not shown).
Par ailleurs, une languette 11 d'égalisation de potentiel électrique fait saillie sur un deuxième bord latéral de l'échangeur thermique 1, opposé au premier bord portant les brides 20, 30 de raccordement.  Furthermore, a tab 11 of electrical potential equalization protrudes on a second side edge of the heat exchanger 1, opposite the first edge carrying the flanges 20, 30 connection.
La languette 11, de forme rectangulaire à plat, est recourbée vers le haut et présente deux portions 111, 112 s'étendant dans deux plans orthogonaux.  The tongue 11, of flat rectangular shape, is bent upwards and has two portions 111, 112 extending in two orthogonal planes.
Une première portion 111, qui s'étend dans le plan des plaques 10a, 10b, est prolongée par une deuxième portion 112 courbe, elle-même prolongée par une troisième portion 113 d'extrémité qui est perpendiculaire à la première portion 111.  A first portion 111, which extends in the plane of the plates 10a, 10b, is extended by a second curved portion 112, itself extended by a third end portion 113 which is perpendicular to the first portion 111.
La troisième portion 113 de la languette 11 d'égalisation de potentiel présente une surface 114 de contact électrique avec un module électrique de batterie (non illustré) qui est destiné à venir en contact thermique avec la plaque 10a de l'échangeur thermique.  The third portion 113 of the potential equalization tab 11 has a surface 114 of electrical contact with an electric battery module (not shown) which is intended to come into thermal contact with the plate 10a of the heat exchanger.
Conformément à l'invention, la languette 11 comprend une première partie lia de languette, faisant saillie à partir d'un bord latéral de la première plaque 10a, et une seconde partie 11b de languette faisant saillie à partir d'un bord latéral de la seconde plaque 10b et venant se plaquer contre la première partie lia de languette lorsque les plaques 10a, 10b sont accolées. According to the invention, the tongue 11 comprises a first tongue portion 11a protruding from a side edge of the first plate 10a, and a second tongue portion 11b projecting from a side edge of the tongue. second plate 10b and coming to press against the first tongue portion 11a when the plates 10a, 10b are contiguous.
Les première et seconde parties lia, 11b de languette s'étendent ainsi en regard l'une de l'autre et sont superposées de sorte à ce que l'épaisseur de la languette soit sensiblement égale à l'épaisseur de l'échangeur thermique 1. Les première et seconde parties lia, 11b de languette présentent ici la même épaisseur que celle de la première et de la deuxième plaque 10a, 10b respectivement. The first and second parts 11a, 11b of tongues thus extend facing one another and are superimposed so that the thickness of the tongue is substantially equal to the thickness of the heat exchanger 1 . The first and second tongue portions 11a, 11b here have the same thickness as that of the first and second plates 10a, 10b respectively.
L'épaisseur de la languette 11 est ainsi supérieure à la languette des échangeurs thermiques décrits en relation avec l'art antérieur, ce qui accroît sa tenue mécanique.  The thickness of the tongue 11 is thus greater than the tongue of the heat exchangers described in relation with the prior art, which increases its mechanical strength.
Par ailleurs, la mise en œuvre d'une partie de languette sur chacune des deux plaques 10a, 10b, de l'échangeur thermique 1 permet de ne mettre en œuvre qu'un seul type de plaques pour la fabrication de l'échangeur thermique, ce qui réduit le temps et les coûts de fabrication de ce dernier.  Furthermore, the implementation of a tongue portion on each of the two plates 10a, 10b, of the heat exchanger 1 makes it possible to implement only one type of plate for the manufacture of the heat exchanger, which reduces the time and manufacturing costs of the latter.
La figure 3 est une vue de détail de la languette 11 d'égalisation de potentiel électrique de l'échangeur thermique 1 des figures 1 et 2. FIG. 3 is a detailed view of the electrical potential equalization tab 11 of the heat exchanger 1 of FIGS. 1 and 2.
Dans ce mode de mise en œuvre particulier, les première et deuxième parties lia, 11b de la languette 11 sont plaquées l'une contre l'autre et solidarisées par brasage, de manière à former une languette 11 unique dont l'épaisseur "e" correspond à la somme des épaisseurs des première et deuxième parties lia, 11b.  In this particular mode of implementation, the first and second parts 11a, 11b of the tongue 11 are pressed against each other and joined by soldering, so as to form a single tongue 11 whose thickness "e" corresponds to the sum of the thicknesses of the first and second parts 11a, 11b.
L'épaisseur de la languette 11 d'égalisation de potentiel est supérieure aux languettes de l'art antérieur de sorte que, pour une valeur de section transversale identique, la largeur de la languette 11 est plus faible comparée à la largeur des languettes de l'art antérieur.  The thickness of the potential equalization tab 11 is greater than the tabs of the prior art so that, for an identical cross-sectional value, the width of the tab 11 is smaller compared to the width of the tabs of the tab. prior art.
Tel que représenté, la languette 11 d'égalisation de potentiel électrique présente une épaisseur "e" de 1 mm et une largeur
Figure imgf000012_0001
de 33 mm. As shown, the electric potential equalization tongue 11 has a thickness "e" of 1 mm and a width
Figure imgf000012_0001
33 mm.
Ainsi, la languette 11 présente une section transversale de 33 mm2, la section transversale correspondant à la largeur "I" multipliée par l'épaisseur "e". Thus, the tongue 11 has a cross section of 33 mm 2 , the cross section corresponding to the width "I" multiplied by the thickness "e".
Par ailleurs, la languette 11 est recourbée de sorte que sa surface 114 de contact vienne se plaquer contre une face d'un module électrique disposé en contact thermique avec une plaque lia, 11b de l'échangeur thermique 1. La surface 114 de contact s'étend ici perpendiculairement au plan des plaques lia, 11b de l'échangeur thermique 1. Furthermore, the tongue 11 is bent so that its contact surface 114 comes to press against a face of an electrical module disposed in thermal contact with a plate 11a, 11b of the heat exchanger 1. The contact surface 114 extends here perpendicular to the plane of the plates 11a, 11b of the heat exchanger 1.
Tel qu'illustré, la languette 11 présente une section transversale sensiblement en forme de « L ».  As illustrated, the tongue 11 has a substantially L-shaped cross-section.
On note que la surface 114 de contact est plane de sorte à pouvoir être aisément solidarisée à une face plane du module électrique, par soudage laser ou par vissage par exemple.  Note that the surface 114 of contact is planar so that it can be easily secured to a flat face of the electrical module, by laser welding or by screwing for example.
La figure 4 est une vue de l'échangeur thermique 1 lorsqu'il est disposé entre deux modules 40, 40' électriques de batterie au sein d'un pack batterie. FIG. 4 is a view of the heat exchanger 1 when it is disposed between two battery electric modules 40, 40 'within a battery pack.
Tel qu'illustré, l'échangeur thermique 1 est agencé entre deux modules 40, 40' électriques adjacents de sorte que la première plaque 10a soit en contact thermique avec une face d'un premier module 40 électrique et que la seconde plaque 10b soit en contact thermique avec une face d'un deuxième module 40' électrique.  As illustrated, the heat exchanger 1 is arranged between two adjacent electrical modules 40, 40 'so that the first plate 10a is in thermal contact with a face of a first electrical module 40 and the second plate 10b is in position. thermal contact with a face of a second module 40 'electric.
La languette 11 d'égalisation de potentiel électrique est formée par l'assemblage par brasage des première et deuxième parties lia, 11b de languette.  The electric potential equalization tongue 11 is formed by brazing the first and second tongue portions 11a, 11b together.
La languette 11 est recourbée et sa surface de contact 114 est disposée contre une face d'un des modules électriques, en l'occurrence le premier module 40 électrique.  The tongue 11 is bent and its contact surface 114 is disposed against a face of one of the electrical modules, in this case the first electrical module 40.
Ainsi, une face extérieure du module 40 électrique est en contact avec l'unique languette 11 d'égalisation de potentiel présentant, dans cet exemple, une section transversale de 33 mm2. Thus, an outer face of the electrical module 40 is in contact with the single potential equalization tab 11 having, in this example, a cross section of 33 mm 2 .
La languette 11 assure le passage du courant du module 40 électrique vers l'échangeur thermique 1.  The tongue 11 ensures the passage of the current of the electrical module 40 to the heat exchanger 1.
La figure 5 illustre une mise en œuvre particulière de l'invention dans laquelle les première et deuxième parties lia, 11b de la languette 11 de chaque échangeur thermique 1 conforme à l'invention, sont séparées (en ce sens qu'elles ne sont pas solidarisées l'une à l'autre) de sorte que leurs extrémités libres puissent être écartées l'une de l'autre. FIG. 5 illustrates a particular embodiment of the invention in which the first and second parts 11a, 11b of the tongue 11 of each heat exchanger 1 according to the invention, are separated (in that they are not secured to one another) so that their free ends can be spaced apart from each other.
Dans l'exemple illustré, trois modules électriques sont juxtaposés, un échangeur thermique 1 conforme à l'invention étant disposé entre deux modules électriques adjacents de sorte à réguler thermiquement ces derniers.  In the illustrated example, three electrical modules are juxtaposed, a heat exchanger 1 according to the invention being disposed between two adjacent electrical modules so as to thermally regulate them.
Chaque échangeur thermique 1 est ainsi agencé entre deux modules 40, 40', 40" électriques adjacents.  Each heat exchanger 1 is thus arranged between two adjacent modules 40, 40 ', 40 "electrical.
Pour l'échangeur thermique 1 de droite sur la figure 5, la première partie lia de la languette est recourbée pour venir en contact un premier module 40 électrique situé sur un premier côté de l'échangeur 1 et la seconde partie 11b de la languette est recourbée pour venir en contact avec un deuxième module 40' électrique situé sur un deuxième côté de l'échangeur 1.  For the heat exchanger 1 on the right in FIG. 5, the first part 11a of the tongue is bent to come into contact with a first electrical module 40 located on a first side of the exchanger 1 and the second part 11b of the tongue is curved to come into contact with a second electrical module 40 'located on a second side of the exchanger 1.
Par ailleurs, pour l'échangeur thermique 1 de gauche sur la figure 5, la première partie lia de la languette est recourbée pour venir en contact avec le deuxième module 40' électrique situé sur un premier côté de l'échangeur 1 et la seconde partie 11b de la languette est recourbée pour venir en contact avec un troisième module 40" électrique situé sur un deuxième côté de l'échangeur 1.  Furthermore, for the heat exchanger 1 on the left in FIG. 5, the first part 11a of the tongue is bent to come into contact with the second electrical module 40 'located on a first side of the exchanger 1 and the second part 11b of the tongue is bent to come into contact with a third electrical module 40 "located on a second side of the exchanger 1.
Ainsi, chaque échangeur thermique 1 est relié électriquement à deux modules électriques distincts par le biais des première et deuxième parties de languette lia, 11b qui sont pliées dans des directions opposées.  Thus, each heat exchanger 1 is electrically connected to two separate electrical modules through the first and second tab portions 11a, 11b which are folded in opposite directions.
En d'autres termes, chaque module électrique 40, 40', 40" est couplé, sur une même face, à deux parties de languette solidaires d'échangeurs thermiques distincts.  In other words, each electrical module 40, 40 ', 40 "is coupled, on one and the same face, to two separate tongue portions of separate heat exchangers.
Tel qu'illustré, chaque module électrique est couplé à deux parties de languette présentant respectivement une section transversale de 16,5 mm2 (0,5 mm d'épaisseur pour une largeur de 33 mm) pour une liaison d'égalisation de potentiel présentant une section transversale totale de 33 mm2, c'est à dire la somme des sections transversales des deux parties de languette. Une telle configuration permet d'assurer la continuité d'égalisation de potentiel électrique entre chaque échangeur et les modules électriques de batterie disposés de part et d'autre de ce dernier. As illustrated, each electrical module is coupled to two tongue portions each having a cross-sectional area of 16.5 mm 2 (0.5 mm thick for 33 mm width) for a potential equalization link having a total cross section of 33 mm 2 , ie the sum of the cross sections of the two tongue portions. Such a configuration makes it possible to ensure the continuity of equalization of electrical potential between each exchanger and the battery electrical modules arranged on either side of the latter.
Les deux approches précédemment décrites garantissent en outre la résistance électrique requise, qui est classiquement inférieure à 0,01 Ohm à un courant de 25A pendant 5s sur toute la durée de vie.  The two previously described approaches further guarantee the required electrical resistance, which is conventionally less than 0.01 Ohm at a current of 25A for 5s over the lifetime.
Les plaques de l'échangeur thermique conforme à l'invention sont fabriquées dans un matériau électriquement conducteur, tel que l'aluminium.  The plates of the heat exchanger according to the invention are made of an electrically conductive material, such as aluminum.
Un tel matériau présente notamment d'excellentes propriétés de conductivité thermique, de conductivité électrique, et de résistance à la corrosion, ainsi qu'une masse faible.  Such a material has in particular excellent properties of thermal conductivity, electrical conductivity, and resistance to corrosion, as well as a low mass.
Toutefois, d'autres matériaux électriquement conducteurs peuvent être envisagés.  However, other electrically conductive materials can be envisaged.
Dans les modes de réalisation illustrés, chaque plaque présente une épaisseur de 0,5 mm.  In the illustrated embodiments, each plate has a thickness of 0.5 mm.
Dans d'autres modes de réalisation, chaque plaque présente une épaisseur comprise entre 0,5 et 1 mm.  In other embodiments, each plate has a thickness of between 0.5 and 1 mm.
De préférence, les première et seconde parties de languette sont obtenues lors de l'emboutissage des première et seconde plaques respectivement.  Preferably, the first and second tongue portions are obtained during stamping of the first and second plates respectively.
Dans un mode de réalisation particulier, chaque partie de languette est mise en forme, recourbée par exemple, avant l'assemblage par brasage des première et seconde plaques.  In a particular embodiment, each tongue portion is shaped, bent for example, before the solder assembly of the first and second plates.
Selon un autre mode de réalisation particulier, les parties de languette sont simultanément recourbées après l'assemblage des première et seconde plaques.  According to another particular embodiment, the tongue portions are simultaneously bent after assembly of the first and second plates.
Selon une approche particulière, les parties de languette sont mises en forme après leur solidarisation mutuelle.  According to a particular approach, the tongue parts are shaped after their mutual bonding.
Selon un mode de réalisation particulier, les parties de languette sont mises en forme après solidarisation de celles-ci à au moins un module électrique de batterie. Par ailleurs, la surface de contact de la languette peut présenter une ou plusieurs ouvertures destinées au passage de moyens de fixation, notamment de vis, destinés à solidariser la languette d'égalisation de potentiel au module électrique. According to a particular embodiment, the tongue portions are shaped after joining them to at least one battery electrical module. Furthermore, the contact surface of the tongue may have one or more openings for the passage of fastening means, in particular screws, for securing the potential equalization tab to the electrical module.
De façon avantageuse, la surface de contact de la languette d'égalisation de potentiel présente des reliefs, tels des plots, des nervures ou des ondulations par exemple.  Advantageously, the contact surface of the potential equalization tongue has reliefs, such as pads, ribs or corrugations for example.
Selon une mise en œuvre particulière de l'invention, l'échangeur thermique 1 présente, sur un ou plusieurs de ses bords périphériques, plusieurs languettes d'égalisation de potentiel destinées chacune à venir en contact avec un module électrique distinct.  According to a particular embodiment of the invention, the heat exchanger 1 has, on one or more of its peripheral edges, several potential equalization tongues each intended to come into contact with a separate electrical module.
L'échangeur thermique peut présenter autant de languettes qu'il y a de modules électriques disposés contre les deux plaques le constituant de manière à empêcher ou du moins réduire les différences de potentiels électriques entre chacun des modules électriques et l'échangeur thermique.  The heat exchanger may have as many tabs as there are electrical modules arranged against the two plates constituting it so as to prevent or at least reduce the differences in electrical potential between each of the electrical modules and the heat exchanger.
Dans un mode de réalisation particulier, plusieurs modules électriques sont en contact thermique avec une même plaque de l'échangeur thermique.  In a particular embodiment, several electrical modules are in thermal contact with the same plate of the heat exchanger.

Claims

REVENDICATIONS
1. Echangeur thermique (1) pour la régulation thermique d'au moins un élément de stockage d'énergie électrique (40), notamment pour un véhicule automobile, comprenant une première plaque (10a) et une seconde plaque (10b) solidarisées entre elles de sorte à délimiter un circuit (C) interne de circulation de fluide caloporteur, au moins une desdites plaques (10a, 10b) étant destinée à venir en contact thermique avec ledit au moins un élément de stockage d'énergie électrique (40), 1. Heat exchanger (1) for the thermal regulation of at least one electrical energy storage element (40), in particular for a motor vehicle, comprising a first plate (10a) and a second plate (10b) joined together so as to delimit an internal circuit (C) for circulation of coolant fluid, at least one of said plates (10a, 10b) being intended to come into thermal contact with said at least one electrical energy storage element (40),
ledit échangeur thermique (1) comprenant au moins une languette (11) d'égalisation de potentiel électrique faisant saillie à partir d'un bord dudit échangeur thermique (1) et destinée à venir au contact dudit au moins un élément de stockage d'énergie électrique (40) de sorte à empêcher la formation d'une tension électrique entre ledit échangeur thermique (1) et ledit au moins un élément de stockage d'énergie électrique (40),  said heat exchanger (1) comprising at least one electrical potential equalization tongue (11) projecting from an edge of said heat exchanger (1) and intended to come into contact with said at least one energy storage element electrical (40) so as to prevent the formation of an electrical voltage between said heat exchanger (1) and said at least one electrical energy storage element (40),
ledit échangeur thermique (1) étant caractérisé en ce que ladite au moins une languette (11) comprend deux parties disposées au moins partiellement en regard l'une de l'autre et configurées de façon géométriquement similaire, une première partie (lia) de languette faisant saillie à partir d'un bord de ladite première plaque (10a), et une seconde partie (11b) de languette faisant saillie à partir d'un bord de ladite seconde plaque (10b).  said heat exchanger (1) being characterized in that said at least one tongue (11) comprises two parts arranged at least partially facing one another and configured in a geometrically similar manner, a first portion (11a) of tongue protruding from an edge of said first plate (10a), and a second tongue portion (11b) projecting from an edge of said second plate (10b).
2. Echangeur thermique (1) selon la revendication 1, caractérisé en ce que lesdites première et seconde parties (lia, 11b) de la languette (11) sont solidarisées l'une à l'autre par brasage lors de l'assemblage par brasage des première et deuxième plaques entre elles. 2. heat exchanger (1) according to claim 1, characterized in that said first and second parts (11a, 11b) of the tongue (11) are secured to one another by soldering during assembly by soldering first and second plates between them.
3. Echangeur thermique (1) selon la revendication 1 ou 2, caractérisé en ce que ladite languette (11) présente au moins une surface (114) de contact avec ledit au moins un élément de stockage d'énergie électrique (40). 3. Heat exchanger (1) according to claim 1 or 2, characterized in that said tongue (11) has at least one surface (114) of contact with said at least one electrical energy storage element (40).
4. Echangeur thermique (1) selon la revendication 3, caractérisé en ce que ladite au moins une surface (114) de contact est plane ou présente des reliefs. 4. heat exchanger (1) according to claim 3, characterized in that said at least one surface (114) of contact is flat or has reliefs.
5. Echangeur thermique (1) selon la revendication 3 ou 4, caractérisé en ce que ladite languette (11) est destinée à être recourbée de sorte à ce que ladite au moins une surface (114) de contact vienne se plaquer contre une face dudit au moins un élément de stockage d'énergie électrique (40). 5. heat exchanger (1) according to claim 3 or 4, characterized in that said tongue (11) is intended to be bent so that said at least one surface (114) of contact comes to press against a face of said at least one electrical energy storage element (40).
6. Echangeur thermique (1) selon l'une quelconque des revendications 3 à 5, caractérisé en ce que ladite au moins une surface (114) de contact de ladite languette (11) comprend des moyens de fixation audit au moins un élément de stockage d'énergie électrique (40). 6. heat exchanger (1) according to any one of claims 3 to 5, characterized in that said at least one surface (114) of contact of said tongue (11) comprises fixing means to said at least one storage element of electrical energy (40).
7. Echangeur thermique (1) selon l'une quelconque des revendications 1 à 6, caractérisé en ce que ladite languette (11) présente une épaisseur (e) comprise entre 1 et 2 mm. 7. Heat exchanger (1) according to any one of claims 1 to 6, characterized in that said tongue (11) has a thickness (e) of between 1 and 2 mm.
8. Echangeur thermique (1) selon l'une quelconque des revendications 1 à 7, caractérisé en ce qu'il comprend plusieurs languettes (11) d'égalisation de potentiel réparties sur son bord périphérique et composées chacune d'une première partie (lia) de languette faisant saillie à partir d'un bord de ladite première plaque (10a), et d'une seconde partie (11b) de languette faisant saillie à partir d'un bord de ladite seconde plaque (10b). 8. heat exchanger (1) according to any one of claims 1 to 7, characterized in that it comprises a plurality of tabs (11) potential equalization distributed on its peripheral edge and each composed of a first part (lia ) tab projecting from an edge of said first plate (10a), and a second tongue portion (11b) projecting from an edge of said second plate (10b).
9. Echangeur thermique (1) selon la revendication 1, caractérisé en ce que les première et seconde parties (lia, 11b) de la languette (11) sont séparées, l'extrémité libre de ladite première partie (lia) de languette étant destinée à venir en contact avec un premier élément de stockage d'énergie électrique (40) disposé en contact thermique avec la première plaque (10a) de l'échangeur thermique (1), et l'extrémité libre de ladite seconde partie (11b) de languette étant destinée à venir en contact avec un deuxième élément de stockage d'énergie électrique (40') disposé en contact thermique avec la deuxième plaque (10b) de l'échangeur thermique (1). 9. Heat exchanger (1) according to claim 1, characterized in that the first and second portions (11a, 11b) of the tongue (11) are separated, the free end of said first tongue portion (11a) being intended to come into contact with a first electrical energy storage element (40); ) disposed in thermal contact with the first plate (10a) of the heat exchanger (1), and the free end of said second tongue portion (11b) being intended to come into contact with a second energy storage element electrical (40 ') disposed in thermal contact with the second plate (10b) of the heat exchanger (1).
10. Pack-batterie comprenant au moins un échangeur thermique (1) selon l'une des revendications 1 à 9, pour la régulation thermique d'au moins un élément de stockage d'énergie électrique (40), notamment pour un véhicule automobile 10. Battery pack comprising at least one heat exchanger (1) according to one of claims 1 to 9 for the thermal regulation of at least one electrical energy storage element (40), in particular for a motor vehicle
PCT/FR2018/053295 2017-12-14 2018-12-14 Heat exchanger comprising means for equalising electrical potential WO2019115973A1 (en)

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FR1762161 2017-12-14
FR1762161A FR3075342B1 (en) 2017-12-14 2017-12-14 THERMAL EXCHANGER INCLUDING EQUALIZING MEANS OF ELECTRICAL POTENTIAL

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US5634518A (en) * 1991-11-29 1997-06-03 Long Manufacturing Ltd. Full fin evaporator core
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DE102019133761A1 (en) * 2019-12-10 2021-06-10 Bayerische Motoren Werke Aktiengesellschaft Battery module for a battery, battery for a vehicle, vehicle and a method for producing equipotential bonding

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