FR3122357A1 - Electricity storage battery box for vehicle, battery and associated process - Google Patents

Abstract

Electricity storage battery box for vehicle, battery and associated method This battery box (12) (10) comprises: - a frame (16); - a cover (18), the cover (18) defining with the frame (16) an interior volume; and - a system (20) for fixing the cover (18) to the frame (16) configured to fix the cover (18) to the frame (16), the fixing system (20) being movable between a locking configuration and a release setup. The fixing system (20) comprises: - a blocking member (46) secured to the frame (16); and - a support member (48). The locking member (46) is configured to exert a force on the support member (48) in the direction of the chassis (16) and the support member (48) is configured to exert on the cover (18 ) a force in the direction of the frame (16), when the fastening system (20) is in its locking configuration. Figure for the abstract: Figure 1

Description

Electricity storage battery box for vehicle, battery and associated process

The present invention relates to an electricity storage battery box for a vehicle, comprising:

- a frame made of a material shaped to prevent the passage of electromagnetic waves;

- a cover made of a material shaped to prevent the passage of electromagnetic waves, the cover defining with the frame an interior volume intended to accommodate at least one electricity storage cell; And

- a cover fixing system on the chassis configured to fix the cover on the chassis, the fixing system being movable between a locking configuration in which the fixing system fixes the cover on the chassis, and a release configuration.

Such boxes are configured to house one or more batteries and to protect said battery(ies) from the environment outside the box. Such boxes also make it possible to protect the exterior of the box from the batteries intended to be accommodated in the box.

The batteries intended to be housed in such a box typically contain a large number of electricity storage cells, making it possible to deliver electrical power compatible with the needs of an electrically powered vehicle. The direct current supplied by the electricity storage cells passes through choppers so that it can be used by the vehicle engine. This current chopping at high voltage, for example up to 800 Volts, and at high intensity, for example up to 1000 Amps, generates intense electromagnetic radiation. These electromagnetic waves can have undesirable effects, both for the passengers and for the electrical devices fitted to the vehicle.

Current electricity storage battery boxes may comprise a frame made of a material shaped to prevent the passage of electromagnetic waves and a cover made of a material shaped to prevent the passage of electromagnetic waves. In such boxes, the cover is screwed onto the frame. A large number of screws are required to hold the cover to the case.

However, such electricity storage battery boxes are not entirely satisfactory. Indeed, it is necessary to use a large number of screws to ensure good contact between the cover and the frame. However, such screws are sensitive to corrosion, such a box then being sensitive to corrosion. In addition, the cover and the chassis are not tightened towards each other between two adjacent screws, which compromises the effectiveness of the electromagnetic shielding offered by the case.

One of the aims of the invention is then to propose a casing resistant to corrosion and offering effective electromagnetic shielding.

To this end, the subject of the invention is a box as mentioned above, in which the fixing system comprises:

- A blocking member secured to the frame; And

- a support body,

the blocking member being configured to exert a force on the support member in the direction of the chassis and the support member being configured to exert a force on the bonnet in the direction of the chassis, when the fastening system is in its locking configuration.

Such a fixing system is particularly advantageous, such a support member distributing the force transmitted by the blocking member on the bonnet through the support member, thus improving the tightening of the bonnet on the chassis and the electromagnetic shielding, and also allowing the use of support members to further improve the electromagnetic shielding by avoiding the need for screws.

The vehicle electricity storage battery box may also have one or more of the above characteristics, considered individually or in all technically possible combinations:

• the blocking member comprises a main body secured to the frame and at least one tongue projecting from the main body so as to be offset from the frame, the support member comprising at least one opening, the at least one tongue extending in the at least one opening and exerting on the support member, at the level of the opening, a force in the direction of the frame, when the fixing system is in its locking configuration;
• the bearing member is a plate which comprises an outer bearing edge and an inner bearing edge, the outer bearing edge resting on the frame and the inner bearing edge resting on the bonnet when the fastening system is in its locking configuration, the or each opening extending between the inner bearing edge and the outer bearing edge;
• the box comprises a sealing element, the cover comprising a frame extending around the periphery of the interior volume and accommodating the sealing element, the support member resting on the frame of the cover and the element of the seal being pressed between the cover and the frame when the fastening system is in its locking configuration;
• the frame comprises a main plate and a rim, the main plate defining an upper face, the rim extending around the periphery of the main plate and forming an abutment extending along at least one edge of the upper face, the support member resting on the upper face and abutting on the rim when the fastening system is in its locking configuration;
• the frame comprises at least one slot and in which the support member comprises at least one tab, the tab being arranged in the slot and a support against an edge of the slot when the fastening system is in its locking configuration; And
• the support member comprises at least one puncture, the or at least one tongue comprising a beak, the beak being placed in the puncture and resting against an edge of the puncture when the fastening system is in its locking configuration; And

- the fastening system comprises a bar extending between the blocking member and the support member, the bar transmitting to the support member the force exerted by the blocking member on the support member support when the fastening system is in its locking configuration.

The invention further relates to an electricity storage battery for a vehicle comprising a box as mentioned above, and at least one electricity storage cell extending in the interior volume defined by the cover and the chassis.

The invention also relates to a method for mounting an electricity storage battery for a vehicle as mentioned above, in which the method comprises the following steps:

- placing the cover on the chassis to define an interior volume, at least one electricity storage cell being placed in said interior volume; And

- installation of the support member to bring the fastening system into its locking configuration, the locking member then exerting a force on the support member in the direction of the frame and the support member exerting on the hood a force in the direction of the chassis.

Other characteristics and advantages of the invention will emerge from the detailed description given below, by way of indication and in no way limiting, with reference to the appended figures, among which:

- there is a schematic representation in perspective of an electricity storage battery case for a vehicle according to a first embodiment of the invention;

- there is a schematic representation of a detail of the ;

- there is a cross-sectional schematic representation of the housing of the , wherein the cover fixing system on the frame is in its locking configuration;

- there is a representation similar to that of the , of a second embodiment of the invention;

- there is a representation of a detail of a particular variant of an electricity storage battery box for a vehicle according to the invention;

- there is a representation of a detail of another variant of an electricity storage battery box for a vehicle according to the invention;

- there is a representation similar to that of FIGS. 2 and 4, of a third embodiment of the invention, in which the system for fixing the cover to the frame is in its locking configuration; And

- there is a representation similar to that of the , of the embodiment presented in .

Referring to Figures 1 to 3, an electricity storage battery 10 for a vehicle comprises a box 12 and at least one electricity storage cell 14. The battery comprises for example at least one chopper (not shown).

The battery 10 is intended to equip a motor vehicle such as a car, a bus or a truck.

The vehicle is for example a vehicle propelled by an electric motor, the motor being powered electrically by the battery 10. Alternatively, the vehicle is of the hybrid type and thus comprises a heat engine and an electric motor powered electrically by the battery 10.

The battery typically comprises a large number of electricity storage cells 14.

The electricity storage cells 14 are of any suitable type: lithium-ion polymer (Li-Po), lithium-iron-phosphate (LFP), lithium-cobalt (LCO), lithium-manganese (LMO), nickel-manganese -cobalt (NMC), or are cells of the NiMH ( nickel metal hydride ) type.

The electricity storage cells 14 are parallelepipedal cells, or as a variant are pocket-type cells or even cylindrical cells.

The electricity storage cells 14 are typically distributed in one or more modules, typically in several modules. Each module comprises a plurality of electricity storage cells 14, integral with each other, and equipped with electrical conductors electrically connecting the cells to each other.

The or each chopper is electrically connected to the electricity storage cells 14, and is configured to chop the electric current produced by the electricity storage cells 14.

The box 12 comprises a frame 16, a cover 18 and a system 20 for fixing the cover 18 to the frame 16. The box 12 preferably further comprises a sealing element 22.

The frame 16 is made of a material shaped to prevent the passage of electromagnetic waves. The frame 16 is for example made of a metallic material such as steel or an aluminum alloy. As a variant, the material is a composite material preferably comprising electromagnetic shielding.

The frame 16 comprises for example a main plate 24 and a rim 26.

The main plate 24 is for example parallelepipedic. A height of the main plate is negligible compared to the other dimensions of the main plate 24, that is to say that it is at least ten times lower than the other dimensions of the main plate 24.

The main plate 24 comprises an upper face 28 facing the cover 18 and a lower face 30 extending from the side of the main plate 24 opposite the cover 18.

In a particular variant, as illustrated in the embodiment of the at 3, the main plate 24 comprises an upper plate 32 and a lower plate 34. The upper plate 32 defines the upper face 28 and the lower plate 34 defines the lower face 30. The upper plate 32 and the lower plate 34 are for example parallel to each other and spaced apart.

The main plate 24 comprises for example a reinforcement 36 extending between the upper plate 32 and the lower plate 34. The reinforcement 36 connects for example the upper plate 32 and the lower plate 34 in the space arranged between the upper plate 32 and bottom plate 34.

In a variant not shown, the plate 24 comprises only one upper face 28 and has no lower face 30. The plate 24 then for example has no rim 26.

In another variant not shown, the plate 24 is solid, that is to say that the upper plate 32 and the inner plate 34 are made in one piece, the reinforcement 36 then being formed by a monolithic block extending between the top plate 32 and bottom plate 34.

Rim 26 extends around the periphery of main plate 24. When main plate 24 includes top plate 32 and a bottom plate 34, rim 26 connects top plate 32 to bottom plate 34 and preferably holds top plate 32 and the bottom plate 34 in position relative to each other.

The rim 26 forms an abutment extending along at least one edge of the upper face 28 of the main plate 24. In other words, the rim 26 protrudes from the upper face 28 along at least one edge of upper face 28.

In the embodiment of the , the frame 16 comprises four flanges 26 and the upper face 28 of the main plate 24 comprises four edges, each flange 26 extending along one of the edges of the upper face 28.

The flange 26 is for example a profile having an omega profile. One of the bases of the omega, forming the omega profile, for example forms the abutment 36 extending along at least one edge of the upper face 28. The other base of the omega profile is optional, as illustrated in where the other base is absent.

Alternatively, the flange 26 is for example formed by a profile having an L profile, a double L profile or any other shape that can form a stop extending along at least one edge of the upper face 28.

The cover 18 is made of a material shaped to prevent the passage of electromagnetic waves. The cover 18 is for example made of a metallic material such as steel or an aluminum alloy. As a variant, the material is a composite material preferably comprising electromagnetic shielding.

The cover 18 defines with the frame 16 an interior volume 38. The cover 18 defines for example a cavity closed off by the frame 16 to form the interior volume 38.

The interior volume 38 is intended to accommodate the at least one electricity storage cell 14. The interior volume 38 accommodates for example the at least one electricity storage cell 14, for example all of the storage cells of electricity 14 from the battery 10, and preferably accommodates the or each chopper of the battery (not shown).

The cover 18 comprises for example an upper bottom 40, at least one side wall 42 and preferably comprises a frame 44.

As illustrated on the , the cover 18 has, seen perpendicular to a plane formed by the upper bottom 40, a substantially rectangular shape.

The upper bottom 40 extends for example substantially parallel to the main plate 24 and away from the main board 24.

The or each side wall 42 preferably extends from the upper bottom 40 towards the frame 16, thus defining the interior volume 38.

The frame 44 extends around the periphery of the interior volume 38. As for example illustrated in the , the frame 44 is connected to the or each side wall 42 and extends around the periphery of the side wall or walls 42.

The frame 44 has for example an omega shape when it is seen in section along a section plane parallel to the side wall 42 to which the frame 44 is connected. The outer bases of the omega are, for example, adapted to rest on frame 16.

The frame 44 accommodates for example the sealing element 22. When the sectional view of the frame 44 is in the shape of an omega, the sealing element 22 is placed in the cavity formed by the omega with the frame 16 .

The omega shape of the frame 44 forms a bump projecting from the upper face 28 of the frame 16.

The sealing element 22 is of any suitable type. It can be toroidal, four-lobed, with several lips, or any other suitable geometry. The sealing element 22 can be made of EPDM (ethylene-propylene-diene-monomer), of NBR (nitrile butadiene rubber, in English, corresponding to a butadiene-acrylonitrile copolymer), or even of FPM (fluorinated polymer) , FKM (Fluoroelastomers or Fluorocarbons in English), AEM (Acrylic Ethylene Elastomers in English) depending on the chemical substances such as oil, fuel, acid, glycol water, etc. that may be in contact with this element.

The sealing element 22 is arranged between the cover 18 and the frame 16. The sealing element 22 is arranged on the periphery of the interior volume 38 and provides sealing between the interior volume 38 and the exterior of the case.

The system for fixing the cover 18 to the frame 16, also called in the rest of the description fixing system 20, comprises at least one locking member 46 and at least one support member 48.

The attachment system 20 is movable between a locking configuration, in which the attachment system 20 secures the cover 18 to the frame 16, and a release configuration. When the fastening system 20 is in its release configuration, the cover 18 is released and is movable relative to the frame 16.

The fastening system 20 is for example mobile between its locking and release configurations by moving the support member 48 between an installed position and an uninstalled position.

The locking member 46 is configured to exert a force on the support member 48 in the direction of the frame 16 and the support member 48 is configured to exert a force on the cover 18 in the direction of the frame 16, when the fastening system 20 of the cover 18 is in its locking configuration. The forces exerted by the blocking member 46 and by the support member 48 are oriented in substantially the same direction.

The blocking member 46 is integral with the frame 16. The blocking member 46 is in particular fixed to the upper face 28 of the frame 16. The blocking member 46 extends along the periphery of the cover 18 when the cover 18 is arranged opposite frame 16.

In the variant presented on the at 3, the fastening system 20 comprises four locking members 46 arranged along the periphery of the cover 18 and more particularly along the frame 44 of the cover 18.

Locking member 46 preferably includes a main body 50 and at least one tab 52. Locking member 46 further preferably includes a plurality of tabs 52. has for example thirteen tongues 52 of a blocking member 46.

The locking member 46 is preferably formed from an elastic material. The locking member 46 is for example formed from a material whose Young's modulus is between 50 and 300 GPa, preferably between 150 and 250 GPa, and even more preferably approximately equal to 200 GPa.

The main body 50 and the at least one tongue 52 are for example made in one piece. The main body 50 and the at least one tab 52 are for example formed together by stamping a plate, for example metal.

The main body 50 is integral with the frame 16. The main body 50 is for example a flat bar extending along the periphery of the cover 18, and more particularly along the frame 44.

The main body 50 is for example welded to the frame 18.

Each tongue 52 protrudes from the main body 50 so as to be offset from the frame 16. In other words, the end of each tongue 52 is not pressed against the frame 16 but extends away from the frame 16. Each tab 52 protrudes from main body 50 in a direction away from cover 18, when cover 18 is installed on frame 16.

As illustrated in , each tab 52 has a sigmoid profile when viewed in cross section along a plane perpendicular to a direction of elongation of the main body 50. One end of the sigmoid profile is then connected to the main body 50 and the opposite end of the sigmoid profile is free.

Each tongue 52 extends from the main body 50 in a general direction forming an angle with respect to the upper face 28 of the main plate 24 of the frame 16, the angle being between 15° and 45°, the angle being for example substantially equal to 30°.

The support member 48 is preferably made of a shaped material to prevent the passage of electromagnetic waves. The support member 48 is for example made of a metallic material such as steel or an aluminum alloy. As a variant, the material is a composite material preferably comprising electromagnetic shielding.

The support member 48 is also preferably made of an elastic material. The support member 48 is for example formed from a material whose Young's modulus is between 50 and 300 GPa, preferably between 150 and 250 GPa, and even more preferably approximately equal to 200 GPa.

The support member 48 is for example a plate, as illustrated in the example of the .

The support member 48 comprises at least one opening 54. Each opening 54 is configured to receive a tab 52 of the locking member 46. The support member 48 is brought into its installed position by inserting the tab 52 into opening 54. In other words, fastening system 20 is brought into its locking configuration by inserting tab 52 into opening 54.

When the fastening system 20 is in its locking configuration, the at least one tongue 52 thus extends into the at least one opening 54. The at least one tongue 52 exerts in particular on the support member 48, at the level of the opening 54, a force in the direction of the frame 16 when the fastening system 20 is in its locking configuration.

The support member 48 comprises for example an outer support edge 56 and an inner support edge 58. As visible on the , the or each opening 54 extends between the outer bearing edge 56 and the inner bearing edge 58.

The inner bearing edge 58 bears against the cover 18 when the cover fixing system 20 is in its locking configuration.

The inner bearing edge 58 is preferably of complementary shape to the periphery of the cover 18. In particular, the inner bearing edge 58 is of complementary shape to the frame 44 and exerts on the frame 44 a force in the direction of the frame 16 when the fastening system 20 is in its locking configuration. When the box 12 includes a sealing element 22, the sealing element 22 is then pressed between the cover 18 and the frame 16 when the fastening system 20 is in its locking configuration.

When the omega shape of the frame 44 forms a bump projecting from the upper face 28 of the main plate 24 of the chassis 16, the inner bearing edge 58 defines, for example, a shaped groove corresponding to the bump projecting from to the upper face 28. Such an arrangement makes it possible in particular to block the movement of the support member 48 relative to the frame 44.

The plate forming the support member 48 extends for example in a general direction forming an angle with respect to the upper face 28 of the main plate 24 of the frame 16, the angle being between 5° and 45°, the the angle being for example substantially equal to 15°.

As illustrated in , the plate forming the support member 48, the omega forming the frame 44 and the upper face 28 of the main plate 24 of the frame 16 together define a hollow volume in which the blocking member 46 extends at least partially .

The outer bearing edge 56 bears against the frame 16 when the fastening system 20 is in its locking configuration. The outer bearing edge 56 is in particular bearing on the upper face 28 of the main plate 24 of the frame 16.

In the embodiment of at 3, the support member 48 is in abutment on the flange 26 when the fastening system 20 of the cover 18 is in its locking configuration. More particularly, the outer bearing edge 56 is then simultaneously resting on the upper face 28 and in abutment on the rim 26.

As seen on the , the battery 10 alternatively comprises a retaining member 60, intended to secure the battery 10 to a vehicle structure. The holding member 60 extends for example through the frame 16. The support member 48 then comprises an orifice 62 intended to accommodate the holding member 60. When the fastening system 20 of the cover 18 is in its locking configuration, the holding member 60 extends through the orifice 62.

A method for mounting an electricity storage battery 10 for a vehicle as previously described will now be presented.

In a first step, the cover 18 is placed on the frame 16 to define the interior volume 38. Prior to this first step, or during this first step, at least one electricity storage cell 14 is placed in the cover 18 and/or on the frame 16 so that it is placed in the interior volume 38 defined by the cover 18 and the frame 16. Preferably, all of the electricity storage cells 14 and the all of the choppers are placed in the cover 18 and/or on the frame 16 so that they are placed in the interior volume 38 defined by the cover 18 and the frame 16 when the cover 18 is put in place on the frame 16. Alternatively, at least one chopper or all of the choppers are arranged away from the box 12, that is to say that the chopper(s) are installed away from the cover 18 and/ or chassis 16.

In a second step, the support member 48 is put in place, or in other words, is brought into its installed position, to bring the fastening system 20 of the cover 18 to the frame 16 in its locking configuration.

The support member 48 is then moved towards the blocking member 46 so that the tongues 52 of the blocking member 46 are inserted into the openings 54 of the support member 48. When the support 48 is in its installed position, the tabs 52 pass through the openings 54, the inner bearing edge 58 rests on the frame 44 and the outer bearing edge 56 rests on the upper face 28 of the main plate 24 of the chassis 16 .

The outer support edge 56 is in abutment on the flange 26, the flange 26 preventing a displacement of the support member 48 away from the cover 18 parallel to the upper face 28.

The locking member 46 exerts a force on the support member 48 in the direction of the frame 16. In particular, the tab(s) 52 exert a force on the support member 48 at the level of the openings 54. support member 48 being in abutment against the flange 26, the support member 48 is tensioned only in the direction of the frame 16 at the level of the openings 54. The support member 48 thus exerts a force on the cover 18 in the direction of frame 16. With reference to , the support member 48 is for example bent due to the force exerted by the tongues 52 at the level of the openings 54 and the resulting forces exerted by the frame 16 and the cover 18 at the level of the outer bearing edges 56 and interior 58.

When the box 12 includes a sealing element 22, the sealing element 22 is then pressed between the cover 18 and the frame 16 due to the force exerted by the support member 48 on the cover 18.

The use of a support member 48 comprising at least one opening 54 in which a tab 52 extends is particularly advantageous for tensioning the support member 48 in the direction of the frame 16, and this, particularly easy way. The position of the opening 54 between the edges of the outer support 56 and the inner support 58 also makes it possible to improve the plating of the support member 48 on the cover 18 and therefore of the cover 18 on the frame 16 .

A frame 44 extending around the periphery of the interior volume 38 makes it possible to improve the support of the support member 48 on the cover 18 and the sealing element 22 is particularly advantageous for limiting the exchanges of material between the interior volume 38 and battery exterior 10.

A rim 26 forming an abutment is particularly advantageous for preventing the support member 48 from moving away from the cover 18 and thus allows the support member 48 to be blocked in its installed position, between the lock 46 and flange 26. This ensures good support of the support member 48 on the cover 18.

A second embodiment will now be described with reference to the . Only the differences with the previously described embodiment are presented. Similar elements bear the same references.

In this embodiment, the fastening system 20 comprises several support members 48 for a blocking member 46. The blocking member 46 is configured to exert a force on each support member 48 and each support member 48 is configured to exert on the cover 18 a force in the direction of the frame 16.

Such a configuration facilitates the manufacture of the support members 48 and/or facilitates the assembly of the battery 10.

A particular variant of the invention will now be described, with reference to the . This variant is compatible with all the embodiments previously and subsequently described. Only the differences between this variant and the variant described in the main embodiment will be repeated in detail here. Similar elements bear the same references.

According to this variant, the frame 16 comprises at least one slot 64 and the support member 48 comprises at least one tab 66. The tab 66 is placed in the slot 64 and bears against an edge of the slot 64 when the system fixing 20 of the cover 18 is in its locking configuration. The cooperation between the tab 66 and an edge of the slot 64 prevents the movement of the support member 48 towards or away from the cover 18 parallel to the upper face 28. Such cooperation can for example replace the cooperation between the outer bearing edge 56 and the flange 26.

Another variant of the invention will now be described, with reference to the . This variant is compatible with all the embodiments previously and subsequently described. Only the differences between this variant and the variant described in the main embodiment will be repeated in detail here. Similar elements bear the same references.

According to this variant, the support member 48 comprises at least one puncture 68 and the at least one tongue 52 comprises a beak 70. The beak 70 forms the free end of the tongue 52 and is oriented towards the frame 16.

The spout 70 is disposed in the puncture 68 and bears against an edge of the puncture 68 when the fastening system 20 of the cover 18 is in its locking configuration. The cooperation between the beak 70 and an edge of the puncture 68 prevents the movement of the support member 48 towards or away from the cover 18. Such cooperation can for example replace the cooperation between the outer support edge 56 and the rim 26.

A third embodiment will now be described with reference to FIGS. 7 and 8. Only the differences with the principal embodiment previously described are presented. Similar elements bear the same references.

In this embodiment, the fastening system 20 of the cover 18 on the frame 16 comprises a bar 72. The bar 72 is for example of circular section and the diameter is chosen to adapt the pressure applied by the fastening system 20 on the outer support edge 56. In particular, an increase in the diameter of the bar 72 makes it possible to increase the pressure applied by the fastening system 20 on the outer support edge 56, and vice versa.

The bar 72 extends between the blocking member 46 and the support member 48, the bar 72 transmitting to the support member 48 the force exerted by the blocking member 46 on the support member. support 48 when the fastening system 20 is in its locking configuration. In this embodiment, the free end of the tongues 52 has a shape complementary to the bar 72 and is configured to hold the bar 72 on the support member 48. Such a bar 72 allows a good distribution of the force exerted by the locking member 46 on the support member 48 and therefore a good distribution of the force exerted by the support member 48 on the cover 18.

Claims (10)

Box (12) of a battery (10) for storing electricity for a vehicle, comprising:
- a frame (16) made of a material shaped to prevent the passage of electromagnetic waves;
- a cover (18) made of a material shaped to prevent the passage of electromagnetic waves, the cover (18) defining with the frame (16) an interior volume (38) intended to accommodate at least one electricity storage cell ( 14); And
- a system (20) for fixing the cover (18) to the frame (16) configured to fix the cover (18) to the frame (16), the fixing system (20) being movable between a locking configuration in which the fastening system (20) secures the cover (18) to the frame (16), and a release configuration,
characterized in that the fastening system (20) comprises:
- a locking member (46) secured to the frame (16); And
- a support member (48),
the locking member (46) being configured to exert a force on the support member (48) in the direction of the chassis (16) and the support member (48) being configured to exert on the cover (18 ) a force in the direction of the frame (16), when the fastening system (20) is in its locking configuration. Case (12) according to Claim 1, in which the locking member (46) comprises a main body (50) integral with the frame (16) and at least one tab (52) projecting from the main body (50) so to be offset from the frame (16), the support member (48) comprising at least one opening (54), the at least one tab (52) extending into the at least one opening (54) and exerting on the support member (48), at the level of the opening (54), a force in the direction of the frame (16), when the fastening system (20) is in its locking configuration. Case according to Claim 2, in which the bearing member (48) is a plate which comprises an outer bearing edge (56) and an inner bearing edge (58), the outer bearing edge (56 ) resting on the frame (16) and the inner bearing edge (58) resting on the cover (18) when the fastening system (20) is in its locking configuration, the or each opening (54 ) extending between the inner bearing edge (58) and the outer bearing edge (56). Housing (12) according to any one of the preceding claims, in which the housing (12) comprises a sealing element (22), the cover (18) comprising a frame (44) extending around the periphery of the interior volume ( 38) and accommodating the sealing element (22), the support member (48) resting on the frame (44) of the cover (18) and the sealing element (22) being pressed between the cover (18) and the frame (16) when the fastening system (20) is in its locking configuration. A case (12) according to any preceding claim, wherein the frame (16) includes a main plate (24) and a rim (26), the main plate (24) defining a top face (28), the rim (26) extending around the periphery of the main plate (24) and forming an abutment extending along at least one edge of the upper face (28), the support member (48) resting on the upper face (28) and in abutment on the flange (26) when the fixing system (20) is in its locking configuration. Case (12) according to any one of the preceding claims, in which the frame (16) comprises at least one slot (64) and in which the support member (48) comprises at least one lug (66), the tab (66) being disposed in the slot (64) and bearing against an edge of the slot (64) when the fastening system (20) is in its locking configuration. Case (12) according to any one of claims 2 to 6, in which the support member (48) comprises at least one puncture (68), the or at least one tab (52) comprising a beak (70) , the spout (70) being disposed in the puncture (68) and resting against an edge of the puncture (68) when the fastening system (20) is in its locking configuration. Case (12) according to any one of the preceding claims, in which the fixing system (20) comprises a bar (72) extending between the locking member (46) and the support member (48) , the bar (72) transmitting to the support member (48) the force exerted by the locking member (46) on the support member (48) when the fastening system (20) is in its locking configuration. Electricity storage battery (10) for a vehicle comprising a casing (12) according to any one of claims 1 to 8, and at least one electricity storage cell (14) extending in the interior volume (38 ) defined by the cover (18) and the frame (16). A method of mounting a vehicle electricity storage battery (10) according to claim 9, wherein the method comprises the following steps:
- placing the cover (18) on the frame (16) to define an interior volume (38), at least one electricity storage cell (14) being placed in said interior volume (38); And
- installation of the support member (48) to bring the fixing system (20) into its locking configuration, the locking member (46) then exerting a force on the support member (48 ) in the direction of the frame (16) and the support member exerting on the cover (18) a force in the direction of the frame (16).