Battery module, particularly for electric vehicles, and battery comprising such a module or a plurality of such modules

Abstract

Battery module, particularly for electric vehicles, and battery comprising such a module or a plurality of such modules. The present invention relates to a module, particularly for electric vehicles, said module comprising a support (1), preferably rectangular in shape, having two substantially flat opposing faces (1a, 1b), one of which, referred to as the fixing face (1a), forms a fixing face, and a plurality of electrochemical cells (2), each extending between a first end (2a) and a second end (2b), and each being fixed by its first end (2a) to the fixing face (1a) of the support (1). It is characterized in that the fixing face has tapped cavities (10a) and in that the first end of each cell has an external thread (20a), such that each cell is fixed to the fixing face by screwing its first threaded end into one of the tapped cavities.It also relates to a battery comprising such a module or a plurality of such modules. Figure to be published with the abbreviation: Fig. 7.

Description

Title of the invention: Battery module, in particular for an electric vehicle and battery comprising such a module or a plurality of such modules

[0001] The present invention relates to the field of batteries, in particular for electric vehicles with battery and relates to a battery module, in particular for an electric vehicle. It also relates to a battery comprising such a module or a plurality of such modules.

[0002] There are at least two known categories of electric vehicles (with battery): battery electric vehicles (BEV) which use exclusively electric motors for their propulsion and hybrid electric vehicles (HEV) which are distinguished from the previous ones by the fact that they have a thermal engine coupled to at least one electric motor whose power supply is provided by a battery kept charged by the thermal engine.

[0003] The batteries used in these vehicles generally comprise one or more electrochemical battery cell module(s), each cell of which constitutes a single energy accumulator and comprises an envelope surrounding and protecting its functional part, as well as a positive terminal (or electrode) and a negative terminal (or electrode). The cells are electrically connected to each other in the module in series and / or in parallel. Furthermore, when the battery comprises a plurality of modules, the latter are electrically connected to each other in series and / or in parallel. The cells or modules are connected to each other using low-impedance conductors, generally in the form of bars or plates and known as bus bars.

[0004] The battery comprises a casing, attached or integrated into the vehicle, in which the modules are arranged, generally in several rows of modules.

[0005] The cells come in various shapes, generally prismatic or cylindrical.

[0006] In the case of cylindrical cells, the positive and negative terminals are located respectively at the two ends of the cell. They offer greater power than prismatic cells thanks to a faster discharge of their energy but can store less energy than prismatic cells. In addition, cylindrical cells are assembled and connected in series and / or in shunt in the module with welding or gluing, which is difficult to implement, often due to a difference in material between the cell casing and the bus bars or other elements for connecting, connecting or supporting the cells. On the other hand, gluing or welding does not allow for the replacement of a single cell, generally requiring the replacement of the entire module, which results in restrictive and costly interventions. In addition, cell replacement interventions frequently result in their destruction, which poses a problem for the recycling of modules which cannot be achieved.

[0007] Other problems arise with cylindrical cells, particularly those using lithium ion technology, which are used in hybrid or battery vehicles. Indeed, the cells generally need to be heated up to ensure optimum operating performance, which requires cooling of the cells to avoid any risk of fire or destruction of their functional part or increased aging of the cells.

[0008] The present invention aims to overcome at least one of these drawbacks.

[0009] For this purpose, the battery module, according to the present invention, in particular for an electric vehicle, said module comprising a support, preferably of rectangular parallelepiped shape, having two substantially planar opposite faces, one of which, called the fixing face, forms a fixing face, a plurality of electrochemical cells each extending between a first end and a second end, each cell being fixed, by its first end, on the fixing face of the support by extending substantially perpendicularly to the latter, characterized in that the fixing face comprises threaded cavities and in that the first end of each cell comprises an external thread, so that each cell is fixed in the fixing face by screwing its first threaded end into one of the threaded cavities.

[0010] Preferably, first conductive means electrically connect the first terminals together and second conductive means electrically connect the second terminals together. Furthermore, the first end of each cell may be provided with a first terminal of a first polarity, more particularly negative, and the second end may be provided with a second terminal of a second polarity, more particularly negative.

[0011] According to a preferred characteristic, the support can advantageously form, at least in a part comprising the tapped cavities, a low impedance electrical conductor, preferably a copper or aluminum conductor. The first conductive means can then be integrated into the support by being formed by said conductor.

[0012] According to another preferred characteristic, the first terminal of each cell may be formed by the thread or the thread area. The thread or the thread area may then be in electrical contact with the tapped cavity concerned when the latter forms, with the other tapped cavities, at least part of the conductor provided for connect the first terminals together.

[0013] According to another additional characteristic, the support comprises at least one cooling chamber extending between the threaded cavities and the face of the support opposite the fixing face, said cooling chamber allowing, through it, the passage of a cooling fluid, preferably a dielectric fluid, to ensure the cooling of the cells.

[0014] The present invention also relates to a battery comprising a module or a plurality of battery modules electrically connected to each other in series and / or in parallel, a first main terminal of a first polarity and a second main terminal of a second polarity and a casing receiving and holding the module(s) arranged next to each other, said casing comprising two orifices respectively making the main terminals accessible, characterized in that the or each module consists of a battery module according to the present invention and in that the first main terminal is connected to first conductive means of one of the modules and the second main terminal is connected to second conductive means of the or one of the modules.

[0015] The invention will be better understood from the following description, which relates to a preferred embodiment, given by way of non-limiting example, and explained with reference to the appended schematic drawings, in which:

[0016] [Fig-1] is a partial perspective view of a module according to the present invention, in an embodiment comprising a cooling chamber, with a cell and a fluidic connector each screwed into one of the threaded cavities,

[0017] [Fig.2] is a perspective view of the support shown in [Fig.l] without the connector and cell,

[0018] [Fig.3] is a perspective view of the cell and fluidic connector shown in [Fig.l], without the support,

[0019] [Fig.4] partially shows the module shown in [Fig.l],

[0020] [Fig.5] shows the module shown in [Fig.l] with six cells and two fluid inlet and outlet connectors and, in exploded view, two frame-shaped insulation elements,

[0021] [Fig.6] is a partial perspective view of a battery, according to the present invention, showing a group of three modules shown in [Fig.5], connected together in series and fluidically connected (fluidically) to each other,

[0022] [Fig.7] is a partial perspective view of a battery, according to the present invention, showing a group of two modules represented in [Fig.5], connected together in parallel and fluidly connected to each other, and of which two cells are not represented to show or visualize the fluid connection between the two modules,

[0023] [Fig-8] is a partial perspective view of a battery, according to the present invention, showing a group of six modules shown in [Fig.5] connected together in parallel and fluidly connected to each other,

[0024] [Fig.9] is a partial perspective view of a battery according to the present invention comprising a housing in the open state and receiving the group of modules shown in [Fig.8],

[0025] [Fig. 10] is a partial perspective view of a battery, according to the present invention, showing a group of six modules shown in [Fig.5] connected together in a series arrangement and fluidly connected to each other,

[0026] [Fig. 11] is a partial view of a battery according to the present invention comprising a casing in the open state and receiving the group of modules shown in [Fig. 10],

[0027] [Fig. 12] shows the battery shown in [Fig. 11] in the closed state of the casing and with its own cooling system.

[0028] The appended figures, in particular 1 to 11, show, at least partially, at least one battery module M, according to the present invention, in particular for an electric vehicle, said module M comprising a support 1 (or a base), preferably of rectangular parallelepiped shape, having two substantially planar opposite faces 1a, 1b, one of which, called the fixing face 1a, forms a fixing face, a plurality of electrochemical cells 2, preferably of cylindrical shape. Each cell 2 extends between a first end 2a and a second end 2b. Each cell 1 is fixed, by its first end 2a, to the fixing face 1a of the support 1, extending substantially perpendicularly to the latter.

[0029] By electrochemical cell 2 is meant a cell 2 forming a single energy accumulator. Such a cell may be, for example, a lithium-ion cell 2.

[0030] The first end 2a of each cell 2 is provided with a first terminal 20a of a first polarity, for example positive, and the second end 2b is provided with a second terminal 20b of a second polarity, for example negative.

[0031] Preferably, first conductive means 1, 10a electrically connect the first terminals 20a to each other and second conductive means 3 electrically connect the second terminals 20b to each other. The cells 2 can then be electrically connected to each other in parallel in the module M.

[0032] According to the present invention, the fixing face 1a comprises threaded cavities (or housings) 10a. In addition, the first end 2a of each cell 2 comprises an external thread 20a (see in particular figures 3 and 4), so that each cell 2 is fixed in the fixing face 2a by screwing its first threaded end 2a into one of the threaded cavities 10a (see in particular figures 1, 4 to 8, 10).

[0033] Thus, thanks to their fixing by screwing directly into the support 1, the cells 2 of such a battery M module can be easily fixed, which reduces intervention costs and can be dismantled and replaced individually without requiring replacement of the entire M module, which makes interventions less restrictive and reduces their costs. Furthermore, because no destruction of the M module is carried out during these interventions, it is possible to recycle the M module.

[0034] Preferably, the support 1 can advantageously form, at least in a part comprising the threaded cavities 10a, a low-impedance electrical conductor, preferably a copper or aluminum conductor. In this case, the first conductive means 1, 10a can be integrated into the support 1 by being formed by said conductor. Such a conductor can be connected to a main terminal B1 of the battery, or to a conductor of another module M according to the present invention formed by the first or second conductive means 1, 10a, 3. Furthermore, the first terminal of each cell 2 can be formed by the thread 20a or the area of ​​the thread in contact with the relevant threaded cavity 10a.Thus, it is possible to simultaneously screw and make electrical contact between the cells 2 with the conductor provided to electrically connect their first terminals together, which facilitates the connection of the cells 2 and reduces the cost price of the module accordingly.

[0035] If we refer more particularly to figures 3 and 4, we can see that the or each cylindrical cell 2 comprises a cylindrical envelope and that the external thread 20a is made in the external surface of the envelope at the level of the first end 2a.

[0036] In a preferred embodiment, as can be seen in particular in [Fig. 4], the support 1 may comprise at least one cooling chamber 1e extending between the threaded cavities 10a and the face 1b of the support 1 opposite the fixing face 1a. The cooling chamber 1e allows, through it, the passage of a cooling fluid, for example a dielectric fluid, to ensure the cooling of the cells 2. Such a cooling chamber 1e makes it possible to cool the cell(s) 2 and the module and therefore the battery comprising the module M or a plurality of modules M connected to each other. Thus, the cooling fluid cools at least a portion of the support 1, that is to say at least the area of ​​the threaded cavities 10a which in turn cool the cells 2 by thermal conduction between their surfaces in contact.

[0037] In a preferred embodiment of the support 1 comprising a cooling chamber 1e and making it possible to bring into contact or immerse at least a part of the first end 2a of the cells 2, as can be seen in particular in FIGS. 1, 2 and 4, the bottom of the threaded cavities 10a may comprise an opening 100a, called the fluid communication opening 100a, opening into the chamber 1e. cooling so as to put the latter in fluid communication with the tapped cavity 10a. In addition, the module M may comprise sealing means 4a preventing the escape of the cooling fluid from the tapped cavities 10a while allowing the immersion or contact of at least a portion of the first end 2a in or with the cooling fluid. In the case where the conductor, provided to electrically connect the first terminals 20a, is formed at least in part by the tapped cavities 10a, this embodiment also makes it possible to obtain cooling of the conductor thus in contact with the cooling fluid.This characteristic thus makes it possible to directly (or individually) cool the or each cell 2 (directly) in contact or in immersion, by at least part of its first end 2a, with or in the cooling fluid, which significantly improves or optimizes the cooling of each cell and / or its connections / contacts.

[0038] If we refer more particularly to [Fig. 4], we can see that the bottom of the threaded cavities 10a can comprise an annular edge 101a surrounding the fluid communication opening 100a. The sealing means 4a can consist of annular seals which can each be interposed (at least one) between the annular edge 101a and the end edge of the first end 2a (of the corresponding cell 2) screwed into the corresponding threaded cavity 10a.

[0039] This characteristic relating to cooling, thanks to the presence of such a cooling chamber in the support 1, and where appropriate its extension into the threaded cavities 10a allowing individual cooling of each cell 2 by immersion or direct contact of their first end 2a in or with the cooling liquid, makes it possible to use cells 2, for example using lithium ion technology, requiring the most favorable cooling possible, in particular when they require high temperature increases for their optimum operation. This is particularly the case for cells 2 used for hybrid electric vehicle (HEV) or battery electric vehicle (BEV) batteries. Such a cooling system according to the present invention thus makes it possible to avoid any risk of fire or destruction of the functional part of the cells 2 or increased aging of the latter.

[0040] In the case where the conductor provided for electrically connecting the first terminals 20a is integrated into the support 1 by being formed at least in part by the area of ​​the tapped cavities 10a and where each cell 2 is immersed or in direct contact with the cooling fluid, the cooling fluid is more particularly a dielectric fluid / liquid due to its properties specific to such an application of immersing a current-conducting element in a fluid.

[0041] In order to be able to ensure the supply / inlet of fluid or the outlet of the fluid from the cooling chamber (see in particular figures 1, 3 to 8, 10), the present invention may provide that the module M further comprises at least two fluidic connectors 5, preferably identical, namely a fluidic inlet connector 5 allowing the fluid to enter the chamber 1b and a fluidic outlet connector 5 allowing the fluid to exit the chamber 2. In addition, each connector 5 may comprise an external thread 50a allowing its fixing in one of the threaded cavities 10a and a fluidic passage 50b passing through it, preferably axially, opening into the space of the threaded cavity 10a communicating with the chamber 2. This latter characteristic makes it possible to produce a single type of threaded cavities 10a adapted both for screwing the cells 2 and that of the fluidic connectors 5, this in order not to impose the location of the cells 2 and the connectors 5 on the support 1 and to reduce the price return of support 1.

[0042] The module M may further comprise sealing means 4b preventing the cooling fluid from escaping from the threaded cavities 10a receiving said fluid connectors 5 ([Fig.4]). This characteristic is more particularly advantageous when the cooling fluid is in a liquid form. Indeed, if the fluid is in a gaseous form, for example if the fluid consists of air, the sealing means 4b, such as for example an annular seal, have, more particularly, only the interest of limiting losses and of forcing the pump 9c of a supply unit 9a, 9b, 9c of the cooling circuit to which we will return later.

[0043] In a preferred embodiment, each fluid connector 5 may comprise a fixing base 5a comprising the external thread 50a and a connection end piece 5b which can be axially traversed by the fluid passage 50b. The connection end piece 5b is suitable and intended to be connected to a complementary connector 6 fixed to the end of a fluid supply or outlet conduit 7 (see in particular FIGS. 1, 3 and 4).

[0044] The connection end piece 5b, as illustrated (visible) in particular in Figures 1, 3 to 8, 10, may be suitable and intended to be connected to a connector 6 by assembly by elastic fitting, preferably reversible, as illustrated in the appended figures. Such an assembly allows rapid assembly, in particular by snap-fastening. For this purpose, the connection end piece 5b may have a male shape suitable for being elastically fitted into a female connector 6 fixed to the end of a conduit 7. To achieve the snap-fastening, the connection end piece may comprise at least one external rib 51b cooperating with a rib of the connector 6. The present invention may provide other assemblies (not illustrated in the appended figures) not being made by elastic deformation, such as for example by screwing.

[0045] If we refer to at least one of figures 5 to 11 we can see that the module M can comprise a support plate 8 supporting an electrically conductive plate forming the second conductive means 3. The support plate 8 may comprise holes 8a each arranged in the axis of a threaded cavity 10a and receiving the second end 2b of one of the cells 2 so as to bring the second terminal 20b of each cell 2 into electrical contact with a contact point 3a of the conductive plate 3 to electrically connect the second terminals 20b of the cells 2 together. The conductive plate 3 may be connected to or integrate a main terminal B2 of a battery comprising one or more module(s) M according to the present invention.

[0046] The present invention may provide insulating elements II, 12, for example in the form of a frame, namely an insulating element II surrounding the support 1 on its periphery and an insulating element 12 surrounding the conductive plate 3 on its periphery, and possibly the support plate 8 (see in particular [Fig. 5]). It may also provide insulating elements, for example of annular or cylindrical shape, surrounding the second end 2b around the second terminal 20b.

[0047] The attached figures 6 to 12 also show, at least partially, a battery, according to the present invention, comprising:

[0048] - one or a plurality (at least two) of connected battery modules M electrically with each other in series and / or in parallel,

[0049] - a first main terminal B1 of a first polarity and a second terminal main B2 of a second polarity,

[0050] - a casing C receiving and holding the module(s) M arranged next to each other others, said casing C comprising two orifices C3, C4 making the main terminals Bl, B2 respectively accessible.

[0051] The casing C can be an element specific to the battery and in this case be added with the battery in a vehicle or be an integral part of the vehicle, for example by being integrated into the chassis of the vehicle.

[0052] According to the present invention, the or each module M1, M2 consists of a battery module according to the present invention.

[0053] The first main terminal B1 is connected to the first conductive means 1, 10a of the or one of the modules M and the second main terminal B2 is connected to the second conductive means 3 of one of the modules M.

[0054] In a preferred embodiment of the battery, when the module(s) M comprise a cooling chamber, the module(s) M can be mutually connected to each other in a fluidic manner so that the chamber 1c of an upstream module M is in fluidic communication with the chamber 1c of a downstream module M. The fluidic outlet connector 5 of the upstream module M is connected, via a fluidic connection 6, 7, of the conduit 7 type provided with fittings 6, to the fluidic inlet connector 5 of the downstream module M.

[0055] If we refer to figures 10 and 11, we can see that the present invention can provide that the main terminal B1 is mounted on a conductive plate B10 which is applied against and fixed on, for example using screws, the lower face 1b of the support 1, itself conductive by forming a part of the conductor connecting the first terminals 20a of the cells 2.

[0056] In a preferred form, as can be seen in Figures 9, 11, 12, the casing C may comprise a tank C1 provided with a cover C2. The casing C may comprise two openings C5, C6, for example made in one of the sides of the tank C1, making accessible for their fluidic connection respectively the fluidic inlet connector 5, called the main fluidic inlet connector 5, of the or one of the modules M and the fluidic outlet connector 5, called the main fluidic outlet connector 5, of the or one of the modules M.

[0057] The casing C may further comprise:

[0058] - a cooling system 9 comprising a power supply unit 9a, 9b, 9c in cooling fluid, preferably dielectric fluid, a cooling fluid outlet pipe 9d and a cooling fluid inlet pipe 9e,

[0059] - connection means 6, 7, 6' connecting the fluid inlet connector 5 main to the outlet line 9d to supply cooling fluid to the cooling chamber of the module(s) M,

[0060] - connection means 6, 7, 6' connecting the fluid outlet connector 5 main to inlet line 9e to allow the return of coolant to the supply unit 9a, 9b, 9c.

[0061] The power supply unit 9a, 9b, 9c may comprise a reservoir 9a containing a cooling fluid, preferably a dielectric fluid, a heat exchanger 9b and a pump 9c ([Fig. 12]).

[0062] If we refer more particularly to figures 8 to 12, we can see that the connection means 6, 7, 6' connecting the main fluid inlet connector 5 to the outlet pipe 9d can comprise a pipe 7 provided at one of its ends with a connector 6, for example a female connector which can be assembled, for example by elastic fitting, to the male connection end piece 5b of the fluid inlet connector 5 and at its other end with a connection connector or sleeve 6' connected to the outlet pipe 9d.The connection means 6, 7, 6' connecting the main fluid outlet connector 5 to the inlet pipe 9e may also comprise a pipe 7 provided at one of its ends with a connector 6, for example a female connector which can be assembled, for example by elastic fitting, to the male connection end piece 5b of the main fluid outlet connector 5 and at its other end with a connection connector or sleeve 6' connected to the pipe 9e. entrance.

[0063] The cooling system 9 may be specific to the battery or formed in part, for example the power supply unit 9a, 9b, 9c, by an external cooling system, for example of a vehicle in which said battery is mounted.

[0064] Thus, thanks to such a module or such a battery according to the present invention, the cells 2 can be quickly connected in the module and replaced individually without requiring the replacement of the entire module and without damaging the latter. Furthermore, thanks to the screw connection, where appropriate simultaneously causing the electrical connection of the first terminal of the cell, it is possible to save soldering at least on the side of one of the polarities, in particular the negative side of the cells or of the module. Finally, such a module or such a battery is recyclable and offers great modularity.

[0065] Of course, the invention is not limited to the embodiment described and shown in the attached drawings. Modifications remain possible, in particular from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims

Claims

1. Battery module, in particular for an electric vehicle, said module comprising a support (1), preferably of rectangular parallelepiped shape, having two substantially planar opposite faces (1a, 1b), one of which, called the fixing face (1a), forms a fixing face, a plurality of electrochemical cells (2) each extending between a first end (2a) and a second end (2b), each cell (1) being fixed, by its first end (2a), on the fixing face (1a) of the support (1) by extending substantially perpendicularly to the latter, the fixing face (1a) comprising threaded cavities (10a) and the first end (2a) of each cell (2) comprising an external thread (20a), so that each cell (2) is fixed in the fixing face (2a) by screwing its threaded first end (2a) into one of the threaded cavities (10a),characterized in that the support (1) comprises at least one cooling chamber (le) extending between the threaded cavities (10a) and the face (1b) of the support (1) opposite the fixing face (la), said cooling chamber (le) allowing, through it, the passage of a cooling fluid, preferably a dielectric fluid, to ensure the cooling of the cells (2), in that the bottom of the threaded cavities (10a) comprises an opening (100a), called the fluid communication opening (100a), opening into the cooling chamber (le) so as to put the latter in fluid communication with the threaded cavity (10a) and in that the battery module comprises sealing means (4a) preventing the exit of the cooling fluid from the threaded cavities (10a) while allowing the immersion or contact of at least a part of the first end (2a) in or with the cooling fluid.

2. Battery module according to claim 1, characterized in that the bottom of the threaded cavities (10a) comprises an annular edge (101a) surrounding the fluid communication opening (100a) and in that the sealing means (4a) consist of annular seals each interposed between the annular edge (101a) and the end edge of the first end screwed into the corresponding threaded cavity (10a).

3. Battery module, according to any one of claims 1 to 2, characterized in that it further comprises, on the one hand, at least two fluid connectors (5), preferably identical, namely a fluid inlet connector (5) allowing the fluid to enter the chamber (1b) and a fluid outlet connector (5) allowing the fluid to exit the chamber (2), each connector (5) comprising an external thread (50a) allowing its fixing in one of the tapped cavities (10a) and a fluid passage (50b) passing axially through it, opening into the space of the tapped cavity (10a) communicating with the chamber (2).

4. Battery module, according to claim 3, characterized in that each fluid connector (5) comprises a fixing base (5a) comprising the external thread (50a) and a connection end piece (5b) axially traversed by the fluid passage (50b), said connection end piece (5b) being suitable and intended to be connected to a connector (6) fixed to the end of a conduit or pipe (7) for supplying or discharging the fluid.

5. Battery module according to any one of claims 1 to 4, characterized in that the first end (2a) of each cell (2) is provided with a first terminal (20a) of a first polarity and the second end (2b) is provided with a second terminal (20b) of a second polarity, in that it comprises first conductive means (1, 10a) electrically connecting the first terminals (20a) together and second conductive means (3) electrically connecting the second terminals (20b) together and in that it comprises a support plate (8) supporting an electrically conductive plate forming the second conductive means (3),said support plate (8) comprising holes (8a) each arranged in the axis of a threaded cavity (10a) and receiving the second end (2b) of one of the cells (2) so as to put the second terminal (20b) of each cell (2) into electrical contact with a contact point (3a) of the conductive plate (3) to electrically connect the second terminals (20b) of the cells (2) together.,

6. Battery comprising one or a plurality of battery modules (M) electrically connected to each other in series and / or in parallel, a first main terminal (Bl) of a first polarity and a second main terminal (B2) of a second polarity and a casing (C) receiving and holding the modules (M) arranged next to each other, said casing (C) comprising two orifices (C3, C4) respectively making the main terminals (Bl, B2) accessible, characterized in that the or each module (Ml, M2) consists of a battery module according to any one of claims 1 to 5 and in that the first main terminal (B1) is connected to first conductive means (1, 10a) of the or one of the modules (M) and the second main terminal (B2) is connected to second conductive means (3) of the or one of the modules (M).

7. Battery, according to claim 6 taken in combination with any one of claims 3 to 4, characterized in that the modules (M) are mutually connected to each other in a fluidic manner so that the chamber (Ic) of an upstream module (M) is in fluidic communication with the chamber (Ic) of a downstream module (M), the fluidic outlet connector (5) of the upstream module (M) being connected, via a fluidic connection (6, 7), of the conduit (7) type provided with fittings (6), to the fluidic inlet connector (5) of the downstream module (M).

8. Battery according to claim 7, characterized in that the casing (C) comprises two openings (C5, C6) making accessible for their fluid connection respectively the fluid inlet connector (5), called the main fluid inlet connector (5), of the or one of the modules (M) and the fluid outlet connector (5), called the main fluid outlet connector (5), of the or one of the modules (M) and in that it further comprises, on the one hand, a cooling system (9) comprising a supply unit (9a, 9b, 9c) for cooling fluid, preferably dielectric fluid, a cooling fluid outlet pipe (9d) and a cooling fluid inlet pipe (9e) and, on the other hand, connection means (6, 7,6') connecting the main fluid inlet connector (5) to the outlet pipe (9d) to supply cooling fluid to the cooling chamber (le) of the module(s) (M) and connection means (6, 7, 6') connecting the main fluid outlet connector (5) to the inlet pipe (9e) to allow the return of the cooling fluid to the supply unit (9a, 9b, 9c).,

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