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
  • H01M10/655—Solid structures for heat exchange or heat conduction
  • H01M10/6554—Rods or plates
• • 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
  • H01M10/62—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
  • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
  • H01M10/647—Prismatic or flat cells, e.g. pouch cells
• • 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
  • H01M10/6567—Liquids
  • H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
  • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M2220/00—Batteries for particular applications
  • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
• • 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

• the present invention relates to the field of batteries, and more particularly the field of batteries for the electric propulsion of vehicles with hybrid or electric propulsion.
• an assembly comprising at least one battery module containing at least one electrochemical cell.
• This battery optionally comprises electrical or electronic means for managing the electrical energy of this at least one module.
• the battery pack often being designated by the English expression “battery pack”, this casing generally containing a mounting interface, and connection terminals.
• electrochemical cell generating current by chemical reaction, for example of lithium-ion (or Li-ion) type, of Ni-Mh or Ni type -Cd or even lead.
• a cooling plate for such an arrangement is known from patent document FR-A1 -3003938 and has a heat exchange plate comprising a base and a contact plate, the base being of molded plastic and the plate of contact being made in a thermally conductive material.
• the plastic base allows a greater variety of fixing methods with the support to which it is fixed, for example by adding specific fixing brackets.
• a drawback of this design is that the plate and the module are fixed independently of one another in the casing, causing positioning dispersions between the module and the plate.
• the housing having the interface assembly of the module and the plate is complex to achieve, all the more complex as this housing is generally a large part receiving several modules and several heat exchange plates.
• the aim of the invention is to remedy these drawbacks, in particular by optimizing the cooling plate.
• the invention relates to a heat exchange system comprising a battery module and a heat exchange plate by conduction with the battery module, this heat exchange plate comprising a base plate and a thermal contact plate in contact with the battery module and fixed to the base plate, the base plate comprising a first means for fixing the heat exchange plate on a support, and comprising a second means for fixing the heat exchange plate. the heat exchange plate against the battery module, this second fixing means being separate from the first fixing means.
• the base plate can be pre-assembled on the battery module, the one and the other then being precisely positioned between them due to a chain of reduced dimension.
• the base plate integrating the first and the second fixing means, the support receiving the base plate can be considerably simplified by comprising only the mounting interface of the base plate, and no longer the interface of the base plate. mounting the battery module.
• the base plate is made of plastic.
• the base plate can have a significant thickness, and then have a high rigidity of shape without being too heavy, compared to a metal base plate such as an aluminum alloy. This rigidity of form then makes it possible to fix several battery modules on the same base plate.
• the plastic material is heat-insulating, again compared to the metallic material.
• the base plate is made of a heat-insulating plastic material whose thermal conductivity (l) is less than 2 Wm-1 -K-1 at 20 ° C. This makes it possible in particular to avoid heat exchanges between the base plate and an environment outside the heat exchange system.
• the plastic material comprises a filler.
• plastics in the form of resins loaded with glass or carbon fibers then forming a material whose thermal conductivity will be a little higher than uncharged plastics, between 0.15 and 2 Wm-1 -K-1 at 20 ° C depending on the orientation or not of the fibers, and the direction of heat propagation considered, and allowing to increase the rigidity of the base plate and therefore, to increase its cut.
• the first fixing means or the second fixing means comprise a metal insert in the material of the base plate, this metal insert having a bore shaped to receive a screw.
• the first fixing means comprises for example a screw and an insert forming a spacer having a smooth central bore through which the screw passes.
• the screw tightening force is therefore taken up by the spacer and not by the base plate, the threaded end of the screw being caught in a threaded hole in the support. This prevents the plastic material from creeping.
• the second fixing means comprises for example a screw and an insert having a threaded central bore through which the threaded end of the screw passes, the screw head blocking the battery module against the heat exchange plate without risk of degrade the thread of the insert, the latter being metallic.
• the base plate and the thermal contact plate form a cavity between them through which a heat transfer fluid passes.
• the base plate comprises, in its thickness, a recess through which the heat transfer fluid passes, the cavity forming a first level of circulation of the heat transfer fluid, and the recess forming a second level of circulation of this heat transfer fluid.
• the heat transfer fluid has a path in the cavity which is a function of zones of the battery module to be cooled, this path possibly being for example rectilinear in several parallel channels or in the form of overlapping coils or not.
• the heat transfer fluid travels through the recess which is not a function of thermal stresses since the base is in thermo-insulating material, but depending on the desired pressure drop of the fluid, generally minimal.
• the second level of circulation makes it possible to transport the heat transfer fluid in an isothermal manner.
• This recess also makes it possible to increase the structural rigidity of the base plate without making it heavier.
• the first level and the second level are fluidly connected in series.
• the second level then forms a fluid return circuit which, being thermally isolated, does not disturb the performance of the heat exchange occurring between the battery module and the heat exchange plate.
• the heat transfer fluid of the first level is completely emptied through the second level.
• the first level and the second level are fluidly connected in parallel.
• the second level then forms a circuit transporting part of the heat transfer fluid which, being thermally insulated, will not be heated by the fluid in the cavity.
• This second level will, for example, open into a cavity and / or a recess of a second heat exchange plate.
• the subject of the invention is also a battery comprising a heat exchange system as described above, and a casing confining the heat exchange system, the support being a bottom of the casing.
• This housing comprises, for example, a receptacle receiving the heat exchange system, this receptacle being covered with a cover. This casing then forms a confined internal space protecting all the modules and heat exchange plates from any splashing water or shocks.
• the subject of the invention is also a method for assembling a battery as described above, this method comprising successively a first step of assembling the heat exchange plate against the battery module, and a second step. assembly step of this assembly on the bottom of the housing.
• FIG 1 shows a heat exchange system according to the invention.
• FIG 2 Figure 2 shows this heat exchange system with a section to the right of the second fixing means.
• FIG. 1 shows a heat exchange system according to a particular embodiment of the invention, without limitation.
• This heat exchange system comprises ten battery modules 2 and a single heat exchange plate 1 by conduction with each of the battery modules 2.
• the battery modules 2 are divided into a group of eight modules 2 and a group of two. modules 2, and in a variant not shown there are two thermal plates 2 of different size, one being in thermal contact with each of the modules of the group of eight modules 2, the other being in thermal contact with each of the modules of the group of two modules 2.
• two thermal plates 2 of different size, one being in thermal contact with each of the modules of the group of eight modules 2, the other being in thermal contact with each of the modules of the group of two modules 2.
• other configurations are possible, with three or more plates, and modules 2 of any shape.
• the modules 2 are preferably parallelepipedal and have a face in contact with the heat exchange plate 1.
• this face is a bottom face of the modules 2 when the modules 2 are in position. of use in a land vehicle for example, but as a variant this face can equally well be any face of the module 2.
• thermal paste or a thermal mat 12 (see Figure 2) promoting heat exchange by conduction between the module 2 and the plate 1 by filling in asperities or voids created by manufacturing dispersions of modules 2 or plates 1.
• the heat exchange by conduction between the module 2 and the plate 1 is a thermal flow considered in both possible directions: the heat going from the module 2 to the plate 1 for cooling of the module 2 or, conversely , going from plate 1 to module 2 for heating of module 2.
• a network of heat transfer fluid pipes (not shown) connects the plates 1 together, this heat transfer fluid transporting the calories to an exchanger (not shown) for example, an air / heat transfer fluid exchanger.
• FIG. 2 illustrates the heat exchange plate 1 in thermal contact with the face of the module 2.
• This plate 1 comprises a base plate 3 and a thermal contact plate 4 in contact with the battery module 2 and fixed. to the base plate 3, for example by crimping or gluing or screwing.
• the base plate 3 comprises a first fixing means 6 of the heat exchange plate 1 on a support (not shown).
• the base plate 3 comprises a second fixing means 7 of the heat exchange plate 1 against the battery module 2. This second fixing means 7 is separate from the first fixing means 6.
• the base plate 3 is made of plastic, for example injected plastic.
• the plastic material includes a filler.
• the first fixing means 6 or the second fixing means 7 comprise a metal insert 10, 8 in the material of the base plate 3, this metal insert 10, 8 having a bore shaped to receive a screw (not shown ).
• the insert 10 of the first fixing means 6, called the first insert 10 is a spacer having a smooth central bore through which a first screw passes the threaded end of which is caught in a threaded hole in the support, each end of the spacer flush with the outer surface of the base plate 3 so that the spacer takes up all of the clamping force between the head of the first screw and the support.
• the insert 8 of the second fixing means 7, called the second insert 8 has a threaded central bore engaged with the threaded end of a second screw, this second screw passing through a smooth bore 14 of the module 2, the head of the second screw tightening the battery module 2 against the heat exchange plate 1 without risk of damaging the thread of the second insert 8, the latter being metallic.
• the first insert 10 and the second insert 8 are for example overmolded by the base plate 3. As a variant, these inserts 10, 8 are screwed, glued, or crimped into the base plate 3.
• first and second inserts 10, 8 are arranged in the thickness of a rib 13 of the base plate 3, to promote adhesion between the inserts 10, 8 and the base plate 3.
• This rib 13 is ideally disposed partially or entirely along the length of one of the four sides of the base plate 3, ideally on the longer side so as to further stiffen the base plate 3.
• a second rib 13 is arranged parallel to the first, on the opposite side of the base plate 3, this second rib 13 also incorporating first and second means of fixing 6, 7.
• Other geometries of the ribs 13 and base plate 3 can be envisaged, in particular when the battery modules 2 are not parallelepipedal, for example cylindrical or with broken planes to adapt to the interfaces of the vehicle structure .
• the base plate 3 and the thermal contact plate 4 form a cavity 5 between them traversed by the heat transfer fluid.
• the base plate 3 comprises, in its thickness, a recess 11 through which the heat transfer fluid passes, the cavity 5 forming a first level of circulation of the heat transfer fluid, and the recess 11 forming a second level of circulation of this fluid. coolant.
• the first level and the second level are for example fluidly connected in series, but as a variant the first level and the second level are fluidically connected in parallel.
• this partition 15 advantageously participates in the stiffening of the base plate 3, in the same way as the rib 13.
• the series connection of the two levels is achieved, for example, by fluid communication (not shown) at one end of the heat exchange plate 1 between the two levels.
• This connection can be internal to the heat exchange plate 1 or external by using a pipe of the network of pipes for heat transfer fluid.
• the heat transfer fluid then passes successively through the first level then the second level, the second level then forming a fluid return circuit which, being thermally isolated, does not disturb the efficiency of the heat exchange occurring between the battery module 2 and the heat exchange plate 1.
• the heat transfer fluid from the first level is completely emptied through the second level.
• the parallel connection is made, for example, by providing an inlet for the coolant fluid in the heat exchange plate 1 common to the two levels, each level having a separate coolant outlet from one another.
• the fluid leaving the first level can then be channeled to the air / heat transfer fluid exchanger via the network of heat transfer fluid pipes, while the fluid leaving the second level can be channeled to a fluid inlet of another plate. heat exchange 1 before being in turn channeled to the air / heat transfer fluid exchanger.
• the second level then forms a circuit channeling part of the heat transfer fluid which, being thermally insulated, will not be heated by the fluid located in the cavity 5.
• This second level will lead, for example, into a cavity and / or a recess. a second heat exchange plate via the network of heat transfer fluid pipes.
• a casing confines this heat exchange system, this assembly then forming a battery, for example a traction battery of a vehicle.
• the support is for example a bottom of this casing.
• This casing isolates the modules 2 from all contact with splashing water, and confines all gaseous emissions from the modules 2 in the internal space of this casing.
• a vehicle in particular an electric or hybrid vehicle, advantageously comprises such a battery.
• a method of assembling such a battery successively comprising a first step of assembling the heat exchange plate 1 against the battery module 2, and a second step of assembling this assembly on the bottom of the housing is advantageous.
• This process makes it possible to have a module 2 and heat exchange plate 1 assembly pre-assembled, for example from a supplier, independently of the assembly of this assembly in the assembly line of the vehicle incorporating this casing.
• This process facilitates assembly while ensuring the quality of the assembly of module 2 on plate 1 in terms of relative positioning and thermal conductivity.
• the assembly line is also less complex and the line edges are less cluttered while having a reduced footprint.
• the first step of assembling the heat exchange plate 1 against the battery module 2 is carried out by an operator or an assembly means.
• automated system carrying out a first screwing sub-step using the second fixing means 7 which, in the example described above, comprises the second screw tightening the heat exchange plate 1 against the battery module 2.
• the second step of assembly of this assembly on the bottom of the casing is carried out by an operator or an automated assembly means performing a second screwing sub-step using the first fixing means 6 which, in the example described above, comprises the first screw tightening the heat exchange plate 1 against the bottom of the housing.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Secondary Cells (AREA)
• Battery Mounting, Suspending (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=68987946

Family Applications (1)

Country Status (4)

Family Cites Families (11)

• 2019
  • 2019-09-20 FR FR1910397A patent/FR3101140B1/fr active Active
• 2020
  • 2020-07-22 WO PCT/FR2020/051330 patent/WO2021053277A1/fr unknown
  • 2020-07-22 CN CN202080065768.0A patent/CN114424384A/zh active Pending
  • 2020-07-22 EP EP20757628.1A patent/EP4032140A1/de active Pending

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