FR3056342A1 - BATTERY TEMPERATURE MANAGEMENT - Google Patents

Abstract

The description relates in particular to a temperature management device of an electric battery, the electric battery comprising a first cell (CEL1) and a second cell (CEL2). The device comprises a heat sink (HS) made of thermal conductive material, the heat sink containing a phase change material, the heat sink being arranged to be placed between the first cell and the second cell and to be in thermal contact with the first cell and with the second cell. The device comprises a cooling circuit comprising cooling tubes (CP), at least one of said cooling tubes being connected to the heat sink, through which it passes, and being arranged to be filled with a cooling fluid.

Description

® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number: 3,056,342 (to be used only for reproduction orders)

©) National registration number: 16 58842

COURBEVOIE

©) Int Cl ⁸ : H 01 M 10/659 (2017.01), H 01 M 10/625

A1 PATENT APPLICATION

©) Date of filing: 21.09.16. © Applicant (s): VALEO THERMAL SYSTEMS ©) Priority: Simplified joint stock company - FR. ©) Inventor (s): AZZOUZ KAMEL, TRAORE ISSIAKA, BLANDIN JEREMY, TISSOT JULIEN and BOISSELLE (43) Date of public availability of the PATRICK. request: 23.03.18 Bulletin 18/12. ©) List of documents cited in the report preliminary research: Refer to end of present booklet (© References to other national documents ©) Holder (s): VALEO THERMAL SYSTEMS related: Joint stock company. ©) Extension request (s): @) Agent (s): VALEO THERMAL SYSTEMS.

BATTERY TEMPERATURE MANAGEMENT.

FR 3 056 342 - A1 (6 /) The description relates in particular to a device for managing the temperature of an electric battery, the electric battery comprising a first cell (CEL1) and a second cell (CEL2). The device comprises a thermal drain (HS) made of thermal conductive material, the thermal drain containing a phase change material, the thermal drain being arranged to be placed between the first cell and the second cell and to be in thermal contact with the first cell and with the second cell. The device comprises a cooling circuit comprising cooling tubes (CP), at least one of said cooling tubes being connected to the heat sink, which it passes through, and being arranged to be filled with a cooling fluid.

OUT SPR1

BATTERY TEMPERATURE MANAGEMENT

The description relates in particular to a battery temperature management device, in particular a battery for a hybrid or all-electric motor vehicle.

Electric and hybrid vehicles are in fact fitted with electric batteries, the temperature of which, for optimal use in charge and discharge, must remain within a range ensuring a satisfactory compromise between battery life and battery efficiency. Indeed, if the temperature within the battery is too high, this deteriorates its lifespan and if the temperature there is too low, this reduces its efficiency. To maintain good performance and prevent further deterioration, electric batteries are usually combined with a cooling system, which can be active or passive, to dissipate the heat produced by the batteries. An example of an active system, requiring mechanical energy, is an indirect cooling system. An indirect cooling system is a system intended to be integrated not in a refrigeration circuit used for air conditioning but in an additional cooling loop (in which a cooling fluid circulates). The evacuation of the calories provided by the electric cells of the battery is thus carried out by means of the indirect cooling system, towards a refrigerating circuit used for air conditioning. However, such an indirect cooling system, which typically implements permanent cooling, is costly in energy and therefore reduces the range of the vehicle powered by the battery. Indeed, electrical energy is necessary for the circulation of the cooling fluid, as well as for the supply of a compressor allowing the circulation of the refrigerant in the refrigerating circuit used for air conditioning (also called chiller in English).

The circulation of the cooling fluid in the indirect cooling system leads moreover to an inhomogeneity of the temperature of the cooling fluid and therefore to an inhomogeneity of the cooling of the electric battery. As the coolant progresses through the indirect cooling system, it absorbs the energy released by the electric heater and heats up. The temperature difference between the inlet and the outlet can in some cases reach several degrees.

PCM is an acronym from the English expression Phase Change Material meaning phase change material. A phase change material is a material which absorbs heat over a limited temperature range. When the PCM temperature becomes higher than the maximum temperature of this temperature range, and when the phase change of the PCM is completed (the two conditions being cumulative), the phase change material has only a low heat sensitive, and its ability to absorb heat becomes negligible. It then only represents an additional thermal resistance hindering the evacuation of heat from its environment. It is known to incorporate in a battery PCM plates between the cells of this battery.

By applying PCM to the entire surface of a cell, we are precisely faced with the problem linked to the fact that PCM absorbs heat up to a certain threshold, but once this threshold is crossed, it becomes thermally resistant (it therefore loses its usefulness), which is contrary to the desired effect.

The invention aims to improve the situation.

The invention relates in particular to a device for managing the temperature of an electric battery, the electric battery comprising a first cell and a second cell, the device comprising:

a thermal drain made of thermal conductive material, the thermal drain containing a phase change material, the thermal drain being arranged to be placed between the first cell and the second cell and to be in thermal contact with the first cell and with the second cell,

- A cooling circuit comprising cooling tubes, at least one of said cooling tubes being connected to the heat sink, which it crosses, and being arranged to be filled with a cooling fluid.

Such a device is advantageous in particular in that it makes it possible to keep the electric battery in its optimum temperature range (for example 20 ° C - 30 ° C) as well as to improve the uniformity of the temperature at the circuit level cooling, which is for example an indirect cooling system, and therefore at the level of the electric battery.

When the stress on the vehicle increases sharply over sufficiently long periods, the thermal power to be discharged at the cells is greater. The inertia of the indirect cooling system is improved compared to the state of the art and makes it possible to adapt quickly enough to these power peaks to avoid a temperature rise in the cells. In addition to managing this inertial constraint, the energy cost of the sudden increase in cold production is reduced compared to the prior art.

The device according to the invention may include one or more of the following characteristics taken alone or in combination.

The invention relates in particular to a temperature management device in which the phase change material of the heat sink contains an added thermal conductive material.

The invention relates in particular to a temperature management device in which the heat sink contains a structure made of thermal conductive material.

The invention relates in particular to a temperature management device in which the cooling circuit comprises first and second coolant collectors, one of the first coolant manifold and the second coolant manifold comprising a coolant inlet and one of the first coolant manifold and the second coolant manifold including a coolant outlet, the coolant tubes connecting the two manifolds, at least one of the coolant tubes io cooling being arranged to bring coolant from the first collector to the second collector, at least one of the cooling tubes being arranged to bring coolant from the second collector to the first collector.

According to one embodiment, the coolant inlet and the coolant outlet belong to the first coolant manifold.

According to one embodiment, the coolant inlet belongs to the first coolant manifold and the coolant outlet belongs to the second coolant manifold.

According to one embodiment, the coolant inlet belongs to the second coolant manifold and the coolant outlet belongs to the first coolant manifold.

According to one embodiment, the coolant inlet and the coolant outlet belong to the second coolant manifold.

The invention relates in particular to a temperature management device comprising compensation means for absorbing the possible expansion of at least one cell of the device.

The invention relates in particular to a temperature management device comprising at least one compression spring, the compression spring being a coil spring, threaded on one of the cooling tubes and placed in abutment against the first or second collector of coolant. The coil spring is for example of cylindrical shape.

The invention relates in particular to a temperature management device comprising at least one leaf spring, the leaf spring being fixed on the first or the second coolant manifold.

The invention relates in particular to a temperature management device comprising at least one pad, the pad being fixed to the first or the second coolant manifold.

The invention relates in particular to a temperature management device in which the heat sink is formed by two metal plates fixed to one another, between which the phase change material is enclosed.

according to one embodiment, one of the two metal plates comprises edges and a concave region.

According to one embodiment, the two metal plates comprise a cavity.

According to one embodiment, the two metal plates are substantially planar and connected by walls.

The invention relates in particular to a temperature management device in which the heat sink is, during its manufacture, arranged to receive a phase change material in liquid form, then to be mechanically closed in a sealed manner in order to retain the phase change material.

The invention relates in particular to an electric battery comprising at least a first cell and a second cell, the battery comprising a temperature management device according to an embodiment of the invention.

Other characteristics and advantages of the invention will appear on reading the description which follows. This is purely illustrative and should be read in conjunction with the accompanying drawings in which:

- Figures 1A and 1B are exploded views of devices according to embodiments of the invention, integrated in a battery;

- Figures 2A, 2B and 2C show three different embodiments of thermal drains of devices according to embodiments of the invention;

- Figure 3 shows a perspective view of a heat sink of a device according to an embodiment of the invention;

- Figures 4A and 4B show two different embodiments of a heat sink of a device according to an embodiment of the invention;

- Figures 5A, 5B and 5C show three different embodiments of a device according to an embodiment of the invention, comprising different means of compensating for the possible expansion of the cells of a battery according to an embodiment of the 'invention.

By qualifying an element of superior, inferior, above, below, vertical, horizontal, high or low, we refer unless otherwise specified to the provision of this element in the state assembled in a motor vehicle, in a frame of reference of the vehicle.

The following embodiments are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each element mentioned within the framework of an embodiment relates only to this same embodiment, or only to characteristics of this embodiment. only apply to this embodiment.

FIG. 1A is an exploded view of a device according to an embodiment of the invention, integrated in a battery. The device comprises a first manifold (in English, manifold) MAN1 and a second manifold MAN2. The first manifold MAN1 comprises an input IN and an output OUT, making it possible, respectively, to bring a cooling fluid into the first manifold and to make it leave it. The first and second collectors are connected by a set of cooling tubes CP (in English, cooling pipe), which are placed all around the cells to cool them well and ensure good temperature uniformity. Battery cells (in this case prismatic cells) are placed between the two collectors. Three cells are represented, but of course the battery can include more or less than three cells. The cells each include a positive terminal PT (in English positive terminal) and negative NT. Each cell is separated from the next cell by a heat sink HS (in English heat sink), which comprises a PCM phase change material. SPR1 springs (in English spring) are threaded on the cooling tubes in order to dampen the possible expansion of the battery cells. An enlarged view of one of these SPR1 springs is included for illustration (it is not an additional element of the device).

FIG. 1B is an exploded view of a device according to a variant of the embodiment illustrated in FIG. 1A, in which, in order to position the electrical cells in said device (once the latter has been assembled), the upper part (side electrical terminals PT and NT) is left free, that is to say without cooling tubes (the three upper tubes of FIG. 1A are not mounted in the device according to the variant of FIG. 1B). Thus, the cells can be incorporated into the device from above, then if necessary removed, without dismantling the device. In return, there is no top cooling.

FIGS. 2A, 2B and 2C represent three different embodiments of a heat sink HS of a device according to an embodiment of the invention, in vertical section. The three thermal drains are each formed from two corresponding aluminum strips (in English mating aluminum foils), respectively AF1 and AF2, AF1 'and AF2', as well as AF1 and AF2. According to a variant, the strips are formed from another metal or even from any thermally conductive material such as a metal-loaded plastic. According to a possible implementation, at least one of the strips comprises a concave region.

According to a first possible implementation (FIG. 2A), a first aluminum strip AF1 is deformed at its periphery, its deformed periphery being brought into contact with the corresponding, non-deformed periphery, of the second aluminum strip AF2. The two strips are then brazed at their peripheries to form a sealed enclosure (thanks to the deformed periphery, the deformation of which is intended to create a cavity between the two strips) which may contain a PCM phase change material. Instead of being brazed, they can also be welded, glued, etc.

According to a second possible implementation (FIG. 2B), a first aluminum strip AF1 'is deformed at its periphery, its deformed periphery being brought into contact with the corresponding periphery, which is also deformed, of the second aluminum strip AF2' . The two strips are brazed at their peripheries to form a sealed enclosure (thanks to the deformed peripheries, the deformations of which aim to create a cavity between the two strips) which can contain a PCM phase change material. Instead of being brazed, they can also be welded, glued, etc.

According to a third possible implementation (FIG. 2C), a first non-deformed aluminum strip AF1 is brought into contact with a second non-deformed aluminum strip AF2 using walls W (in English wall). The walls and strips are brazed to form a sealed enclosure that can contain a PCM phase change material. Instead of being brazed, they can also be welded, glued, etc.

The three aforementioned implementations in this case include an INT interlayer, which makes it possible to ensure thermal conduction of the heat sink even when the temperature of the phase change material has exceeded a threshold from which its thermal conduction becomes very low. The INT interlayer also makes it possible to structurally reinforce the heat drain. According to implementations not shown, no dividers are provided.

The three aforementioned implementations include a passage of the CP cooling tube, in an area free of PCM phase change material from the heat sink (which makes it possible to avoid PCM leaks).

This is for example the zone in which the aluminum strips are brazed (FIGS. 2A and 2B), or also the zone of the heat sink situated on the side of the wall W from which there is no material to be phase change (Figure 2C). The tube passages are located at the periphery of the aluminum strips.

FIG. 3 represents a perspective view of a heat sink of a device according to an embodiment of the invention, as shown in FIG. 2A. This perspective view is simplified and does not include in particular the filling system of the heat sink (allowing the introduction of the phase change material).

FIGS. 4A and 4B represent two different embodiments of a heat sink of a device according to an embodiment of the invention, illustrating the filling technique used to introduce the phase change material into the heat sink.

In FIG. 4A, there is the presence of a crimped tube C (crimped in English). This tube is initially used to pour the phase change material, in liquid form, into the heat sink. Once the phase change material has been introduced, the tube is crimped, for example by crushing its end with pliers. This closes the heat sink and thus prevents the phase change material from escaping.

In FIG. 4B, there is the presence of a riveted tube R (riveted in English). This tube is initially used to pour the phase change material, in liquid form, into the heat sink. Once the phase change material has been introduced, the tube is riveted, by introducing a sealed blind rivet at its end and by riveting it, for example using a riveting pliers. A blind rivet consists of a hollow body (typically a tube with a flange) of deformable alloy, and a rod (which is called a nail), one end of which is swollen. The riveting pliers make it possible to pull the rod with the swollen end and thus make it penetrate into the body of the rivet to carry out the riveting. This closes the heat sink and thus prevents the phase change material from escaping. Alternatively, the rivet is replaced by a mechanical plug of any suitable type.

FIGS. 5A, 5B and 5C represent three different embodiments of a device according to an embodiment of the invention, comprising different means of compensating for the possible expansion of the cells of a battery according to an embodiment of the invention.

In FIG. 5A, springs SPR1 are threaded on cooling tubes, which make it possible to position these springs and to keep them in position. When at least one battery cell expands, it compresses the SPR1 spring or springs, which makes it possible to contain the expansion while preventing destruction of the battery by expansion of its cells (by absorbing these expansions).

In Figure 5B, a PAD pad is attached to the first manifold

MANU When at least one battery cell expands, it compresses the pad, which makes it possible to contain the expansion while preventing destruction of the battery by expansion of its cells (by absorbing these expansions).

In FIG. 5C, plate springs SPR2 are fixed to the first manifold MAN1. When at least one battery cell expands, it compresses the SPR2 springs, which makes it possible to contain the expansion while preventing destruction of the battery by expansion of its cells (by absorbing these expansions).

A first embodiment relates to a device for managing the temperature of an electric battery. The electric battery (for example a hybrid motor vehicle battery or even an all-electric motor vehicle battery) comprises a first cell CEL1 and a second cell

CEL2. Of course it generally includes many other cells, not shown. These cells are for example cells formed by a plastic pouch containing an electrolyte, which are called pouch cell in English (pouch cell if one translates literally, but the person skilled in the art uses the English expression). Other types of cells are possible (for example prismatic cells).

The temperature management device comprises a heat sink HS made of thermal conductive material (such as a metal). The material used is for example aluminum or copper, aluminum being advantageous since it is less expensive.

The heat sink contains a phase change material (called

PCM). It is for example a composite PCM. According to a possible implementation, the PCM is associated with a polymer, the storage capacity of the PCM is then generally reduced in proportion to the level of polymer present in the PCM.

Such a phase change material is for example solid at a temperature below 20 ° C, but can become liquid for example at 25 °.

According to a possible implementation, the heat sink comprises between 10g and 50g (for example 20g) of phase change material.

According to a possible implementation, the PCM is chosen so that its phase change temperature is slightly higher than the optimal temperature for using the battery, which makes it easier to absorb heat peaks.

The heat sink is arranged to be placed between the first cell and the second cell and to be in thermal contact (as opposed to thermal insulation) with the first cell and with the second cell. io According to one implementation, this thermal contact with each cell (the first and the second) is direct (the thermal drain directly touches the cell concerned). Thus, the heat sink is able to receive heat from each cell and to transfer it to the phase change material it contains. By thermal contact is meant a contact having a conductivity at least equal to that of the phase change material when it is in a most conductive phase, and quantitatively sufficient to ensure rapid thermal transfer. According to a possible implementation, a rapid thermal transfer is a thermal transfer which lasts less than 15 seconds, in the sense or when the temperature of a cell rises, the temperature of the thermal drain (when the material with phase memory n has not exceeded its threshold temperature making it resistant) reaches the cell temperature to within 2% in less than 15 seconds.

This bringing the heat drain into contact with the cell is particularly advantageous for the pouch cell type cells, the plastic envelope of which is not very heat conductive and which can therefore have an inhomogeneous temperature in the absence of such contact with a drain thermal over most of their surface. The cells generally have a substantially parallelepipedal and flattened shape. The heat sink is preferably in contact with the major part (more than 90%), even all, of the largest face (in terms of surface) of the cell considered, which allows good heat exchange. This is advantageous compared to solutions which would consist in placing PCM between a cell and a cooler (when the PCM exceeds its phase change temperature, it becomes a thermal insulator). The walls of the heat sink act as a fin by extending the exchange surface with the cooling fluid described below. The PCM can thus quickly absorb the heat given off by the cells and it can also regenerate quickly via the coolant. This ensures good smoothing of heat peaks.

The temperature management device includes a cooling circuit. The cooling circuit comprises cooling tubes CP, at least one of said cooling tubes being connected to the heat sink, which it passes through, and being arranged to be filled with a cooling fluid. The cooling fluid is for example a cooling liquid (for example brine). The connection of the cooling tube to the heat sink is understood as a thermal connection, which can be carried out for example by simple contact. According to a possible implementation, a hole with a diameter identical to that of the cooling tube is made in the heat sink and allows contact between the tube and the heat drain. If necessary, the hole is very slightly larger in diameter than that of the cooling tube, in such a case (as in the previous case) an olive can be passed through the tubes in order to expand them and press them against the thermal drains. . According to a possible implementation, the gap between the cooling tube and the hole is filled with thermal paste. The connection between the cooling tube and the thermal drain thus allows the heat released by the thermal drain (from at least one cell of the battery) to be communicated to the cooling tube which evacuates it thanks to the cooling fluid. it contains.

According to a possible implementation, an electric cell initially to

22 ° C (which is its optimal temperature for use) is likely to give off a thermal power of 23W during a peak of 10 seconds. The PCM is chosen with a phase change temperature of 23 ° C. Thanks to the PCM, it can be seen that the temperature stagnates at the approach of 23 ° C. The higher the amount of PCM, the lower the temperature peak due to the greater inertia of PCM. Once the peak has passed, it can be seen that without PCM the temperature would start to drop while, with the PCM according to the invention, the temperature stagnates due to the regeneration of PCM. With PCM, the temperature takes longer to drop to 22 ° C. The PCM thus smooths up and down in temperature. The PCM is useful in particular in the event of a significant increase in cell temperature.

More generally, the phase change temperature is selected slightly above the optimum temperature for using the electrical cells in order to absorb heat peaks. The optimal temperature for using electrical cells is generally between about 10 ° C and about 40 ° C, depending on the type of battery.

According to a second embodiment, the phase change material of a heat sink of a temperature management device according to the first embodiment contains an added thermal conductive material. By thermal conductor is meant that the added material conducts heat at least as well as the phase change material when the latter is in a phase where it is the most thermal conductor. The thermal conductive material added is for example a metallic foam, a powder (for example metallic), a set of metallic particles and / or carbon particles and / or graphene. Thus, even when the phase change material has become intrinsically insulating, the fact that it contains the added material makes the assembly (phase change material plus added material) much more thermal conductor than the change material would be. phase alone, which allows the cells to continue to cool by absorbing heat and providing a greater mass to dissipate this heat. In addition, the addition of a material in the form of particles or powder makes it possible to retain a certain flexibility for the heat sink, which allows it to more easily withstand any expansion of the cells.

According to a third embodiment, the heat sink of a temperature management device according to the first or second embodiment contains an INT structure made of thermal conductive material. By thermal conductor, it is meant that the structure conducts at least as well the heat as the phase change material when the latter is in a phase where it is the most thermal conductor.

The structure is for example a structure of the turbulator type. This structure, alone or in combination with the added material of the second embodiment, also makes it possible to substantially increase the thermal conductivity of the heat sink. In addition, the structure gives greater rigidity to the heat sink, which can allow it to oppose a deformation of neighboring cells, or else to slide in the cooling tubes instead of being deformed (in the hypothesis where it is not attached to these cooling tubes).

The structure is for example metallic (for example aluminum or even copper, but aluminum is advantageous for its lower cost). The structure can be a spacer. The structure can also consist of a set of fins (for example metallic).

According to a possible implementation, this structure is embedded in the phase change material, in order to give it a certain thermal conductivity. For example, the thermal conductivity of the phase change material is increased tenfold by the presence of the structure. The structure may be that of a turbulator, which then makes it possible to reuse available structures, but does not aim to generate the slightest turbulence on an air flow, since no air in principle passes through this turbulator which is in l species embedded in the phase change material.

According to an alternative, the structure improves the thermal conductivity of the entire device, thanks to its own high thermal conductivity, but is not embedded in the phase change material. For example, the heat sink comprises two sub-modules separated by a turbulator which establishes thermal contact between the two sub-modules.

When the structure is a spacer, it is for example obtained from two flat plates of heat-conductive metal (for example two strips of aluminum or copper), each of the flat plates being provided with a plurality of inclined louvers produced by cutting and forming.

According to a fourth embodiment, the cooling circuit of a temperature management device according to one of the first to the third

embodiments includes a first fluid manifold cooling MAN1 and a second collector of fluid of 15 cooling MAN2. One among the first collector of fluid of cooling MAN1 and the second collector of fluid of cooling MAN2 includes an IN entry of fluid of cooling. Mon among the first collector of fluid of cooling MAN1 and the second collector of fluid of 20 cooling MAN2 includes an OUT output of fluid of

cooling. This input IN and this output OUT are for example connected to a pump making it possible to circulate the cooling fluid in the cooling circuit (the pump is arranged to suck the cooling fluid by the output OUT and to correlatively inject the cooling fluid through the input IN). According to one possible implementation, the cooling circuit is a closed circuit. For example, the pump is placed in series (between the IN inlet and the OUT outlet) with a pipe in thermal contact with a refrigerant circuit used for air conditioning (in which circulates for example a refrigerant such as R134a) . The thermal connection of the pipe can be made for example by simple contact. The refrigeration circuit and the cooling circuit, sealed relative to each other (their fluids do not mix), then communicate their heat. More specifically, the cooling circuit dissipates its heat via the refrigeration circuit. The refrigeration circuit thus makes it possible to cool the cooling fluid coming from the cooling circuit and consequently the cells of the battery.

The CP cooling tubes are for example rigid straight tubes. According to a possible implementation, they are all identical to each other. The CP cooling tubes connect the two collectors. At least one of the cooling tubes is arranged to supply coolant from the first manifold to the second manifold. At least one of the cooling tubes is arranged to supply coolant from the second manifold to the first manifold. A cooling fluid circulation loop is thus created.

According to one embodiment, the inlet IN for coolant and the outlet OUT for coolant belong to the first manifold MAN1 for coolant.

According to one embodiment the input IN of coolant belongs to the first collector MAN1 of coolant and the output OUT of coolant belongs to the second collector

MAN2 coolant.

According to one embodiment, the inlet IN for coolant belongs to the second manifold MAN2 for coolant and the outlet OUT for coolant belongs to the first manifold MAN1 for coolant.

According to one embodiment, the inlet IN for coolant and the outlet OUT for coolant belong to the second collector MAN2 for coolant.

According to a fifth embodiment, a temperature management device according to the fourth embodiment comprises compensation means for absorbing the possible expansion of at least one cell (for example one at least among cells CEL1, CEL2) of the device.

According to a sixth embodiment, a temperature management device according to the fourth or the fifth embodiment comprises at least one compression spring SPR1. According to one possible implementation, such a spring constitutes a means of compensation according to the fifth embodiment. The compression spring is a coil spring, which is for example of cylindrical shape, threaded on one of the cooling tubes CP, and placed in abutment against the first coolant collector MAN1 or against the second coolant collector MAN2. Of course, there can be several compression springs SPR1. These compression springs SPR1 can all be placed in abutment against the same collector, or can for some be placed in abutment against the first collector and for others be placed in abutment against the second collector. A SPR1 spring ensures good thermal contact between the thermal drains and the cells, and also makes it possible to absorb the expansion of a cell and to prevent it from leading to a rupture of the cell and therefore to a electrolyte leakage.

According to a seventh embodiment, a temperature management device according to one of the fourth to the sixth embodiments comprises at least one leaf spring SPR2. According to one possible implementation, such a spring constitutes a means of compensation according to the fifth embodiment. The leaf spring is fixed to the first MAN1 coolant manifold or to the second MAN2 coolant manifold. Of course, there can be several SPR2 leaf springs. These SPR2 leaf springs can all be fixed on the same collector, or can for some be fixed on the first collector and for others be fixed on the second collector. It is possible to use the leaf spring SPR2 alone or in combination with the compression spring (s) SPR1. An SPR2 spring ensures good thermal contact between the thermal drains and the cells, and also makes it possible to absorb the expansion of a cell and to prevent it from leading to a rupture of the cell and therefore to a electrolyte leakage.

According to an eighth embodiment, a temperature management device according to one of the fourth to the seventh embodiments comprises at least one pad PAD. According to one possible implementation, such a cushion constitutes a means of compensation according to the fifth embodiment. The bearing is fixed on the first coolant manifold MAN1 or on the second coolant manifold MAN2. Of course, there can be several PAD pads. These PAD pads can all be fixed on the same collector, or can for some be fixed on the first collector and for others be fixed on the second collector. It is possible to use the PAD pad alone or in combination with the compression spring (s) SPR1 and / or in combination with the leaf spring (s) SPR2. A PAD pad ensures good thermal contact between the thermal drains and the cells, and also makes it possible to absorb the expansion of a cell and to prevent it from leading to a rupture of the cell and therefore to a electrolyte leakage.

According to a ninth embodiment, the heat sink HS of a temperature management device according to one of the first to the eighth embodiments is formed by two metal plates fixed to one another, between which the material to be phase change is locked. Such a heat sink can take different forms, in particular those shown in FIGS. 2A to 2C.

According to a tenth embodiment, the heat sink HS of a temperature management device according to one of the first to the ninth embodiments is, during its manufacture, arranged to receive a phase change material in liquid form. , then to be mechanically sealed to retain the phase change material. Such a heat sink is for example provided with an injection pipe of phase change material previously heated to be in the liquid phase. Once the phase change material is injected, the pipe is crimped (as shown in Figure 4A) or riveted (as shown in Figure 4B), which allows it to be sealed. Such a mechanical closure avoids io heating the heat sink (which would be necessary in particular in the case of welding or soldering), which is advantageous since heating the heat drain could deteriorate the phase change material, which is not not necessarily able to withstand the temperature reached by the heat sink.

According to an eleventh embodiment, an electric battery comprises at least a first cell CEL1 and a second cell CEL2, as well as a device according to one of the first to the tenth embodiments. The battery is for example an electric or hybrid motor vehicle battery. According to a possible implementation, the battery comprises N cells and N-1 thermal drains located between these cells (N being an integer strictly greater than 1). According to a possible implementation, the battery comprises N cells and N + 1 thermal drains located between these cells, before the first cell and after the last cell (N being a strictly positive integer).

Claims (11)

1. Device for managing the temperature of an electric battery, the electric battery comprising a first cell (CEL1) and a 5 second cell (CEL 2), the device comprising: a thermal drain (HS) made of thermal conductive material, the thermal drain containing a phase change material (PCM), the thermal drain being arranged to be placed between the first cell and the second cell and to be in thermal contact with the first cell io and with the second cell, - A cooling circuit comprising cooling tubes (CP), at least one of said cooling tubes being connected to the heat sink, which it crosses, and being arranged to be filled with a cooling fluid. 2. The temperature management device according to claim 1, in which the phase change material of the heat sink contains an added thermal conductive material. 3. A temperature management device according to claim 1 or 2, wherein the heat sink contains a structure (INT) made of 20 thermal conductive material. 4. Temperature management device according to one of the preceding claims, in which the cooling circuit comprises a first (MAN1) and a second (MAN2) coolant collectors, one of the first coolant collector and the second 25 coolant manifold comprising a coolant inlet (IN) and one of the first coolant manifold and the second coolant manifold including a coolant outlet (OUT), the coolant tubes cooling (CP) connecting the two collectors, at least one of the 30 cooling being arranged to supply coolant from the first collector to the second collector, at least one of the cooling tubes being arranged to supply coolant from the second collector to the first collector. 5. A temperature management device according to claim 4, 5 comprising compensation means for absorbing the possible expansion of at least one cell (CEL1, CEL2) of the device. 6. A temperature management device according to claim 4 or 5, comprising at least one compression spring (SPR1), the compression spring being a coil spring, threaded on one of the cooling tubes (CP), and placed in stop against the first (MAN1) or the second (MAN2) coolant collector. 7. Temperature management device according to one of claims 4 to 6, comprising at least one leaf spring (SPR2), the leaf spring being fixed on the first (MAN1) or the second (MAN2) fluid collector of 15 cooling. 8. A temperature management device according to one of claims 4 to 7, comprising at least one pad (PAD), the pad being fixed on the first (MAN1) or the second (MAN2) coolant collector. 20 9. A temperature management device according to one of the preceding claims, in which the heat sink (HS) is formed by two metal plates (AF1, AF2) fixed to one another, between which the material for changing phase is locked up. 10. Temperature management device according to one of claims 25 above, in which the heat sink (HS) is, during its manufacture, arranged to receive a phase change material in liquid form, then to be mechanically closed (R, C) in a sealed manner in order to retain the material phase change. 11. Electric battery comprising at least a first cell (CEL1) 30 and a second cell (CEL2), the battery comprising a temperature management device according to one of the preceding claims. 1/5 MAN2