FR3088144A1 - Battery box - Google Patents

Abstract

Battery box A battery box (10), in particular for an at least partially electrically driven vehicle, comprises an upper part (12) and a lower part (14) together forming a closed box (16) in which a space housing (17) is made in which an electric energy accumulator (22) is adapted to be inserted. Refrigerant lines (34) are integrated into the battery box (10). The lower part (14) comprises a side wall (44) and a metal bottom plate (24) which are connected to each other by a transition section (42), the side wall (44) and the section transition (42) being made of a plastic material, in particular an SMC material, and the bottom plate (24) being made in the form of a support for the energy accumulator (22), being turned towards the space housing (17) with its front face (26) and towards the coolant pipes (34) with its rear face (28), and being embedded in the transition section (42) along its peripheral edge (40 ). Figure for the abstract: Figure 1

Description

Description

Title of the invention: Battery box The invention relates to a battery box which has a housing space for an electric energy accumulator, in particular for use in an at least partially driven vehicle. electrically for the transport of passengers and / or loads, and to a vehicle having such a battery box.

The electrical energy store must be protected as best as possible against environmental influences. It is also necessary to have the possibility of cooling the electrical energy storage device. As low a weight as possible and simple manufacturing are desired.

The object of the invention is to provide an improved battery box which takes account of the criteria mentioned above.

This object is achieved by a battery box which is in particular designed for a vehicle at least partially electrically driven, the battery box comprising an upper part and a lower part together forming a closed box in which a space for housing is made in which an electric energy accumulator is able to be inserted. Refrigerant lines which are integrated in the battery box are also provided. The lower part comprises a side wall and a metal bottom plate which are connected to each other by a transition section, the side wall and the transition section being made of a plastic material. The bottom plate is made in the form of a support for the energy accumulator, is turned towards the housing space with its front face and towards the refrigerant pipes with its rear face, and is embedded in the section of transition along its peripheral edge.

The battery case according to the invention combines the advantages of different materials, namely the flexible shaping of a plastic material with a low weight with the good thermal conductivity of a metal. The plastic material is particularly preferably an SMC (Sheet Molding Material) material.

Since the refrigerant lines are arranged on the rear face of the bottom plate, the refrigerant flowing therein does not enter the housing space and therefore does not reach in contact with the energy accumulator.

Since the bottom plate can be directly embedded in the lower part during manufacturing, a stable and fluid-tight connection is generated with little manufacturing effort between the bottom plate and the transition section.

A seal is advantageously provided between the upper part and the lower part to seal a separation line between the upper part and the lower part and thus also close the housing space at this location vis-à-vis of

Γ environment.

The housing space can then easily be completely closed vis-à-vis the environment to protect the energy accumulator against environmental influences.

A conventionally known battery pack composed of a plurality of individual accumulator cells can for example be used as an energy accumulator, control electronics can also be integrated into the energy accumulator .

The energy accumulator is preferably placed substantially directly on the bottom plate, so that a good thermal transfer to the refrigerant lines is given.

The bottom plate must be made with an inherent rigidity so as to be able to support the weight of the energy accumulator without deforming in an essential manner. A thickness of 1.5 to 3 mm, for example, then proved to be sufficient, especially when the bottom plate is made of aluminum.

The bottom plate can for example be embedded in that the transition section covers an area of the front face and an opposite area of the rear face of the bottom plate along the peripheral edge of the bottom plate, and thus engages around the peripheral edge.

The embedding is preferably carried out by shaping the SMC material of the transition section before it hardens. As an alternative, it would of course also be possible to manufacture the transition section by coating the peripheral edge of the bottom plate by casting or by injection with an appropriate plastic material.

The bottom plate is advantageously embedded in the transition section without interruption along the whole of its peripheral edge to obtain a fluid-tight connection between the transition section and the bottom plate.

The side wall can of course have any suitable shape, so that the housing space and also the outer contour of the box can easily be adapted to the shape of the energy accumulator and to the conditions of mounting space in a vehicle.

In one possible embodiment, the upper part forms a larger partial volume of the housing space, while the lower part only forms a smaller partial volume.

In the normal mounting position, the energy accumulator is placed on the bottom plate so that the refrigerant flows below the energy accumulator. It would however also be conceivable to reverse the mounting position, so that the lower part forms the section of the battery box which is arranged at the top in the vehicle in the assembled state.

The transition section and the side wall advantageously merge into one another in one piece, so that these components can be produced in a manufacturing step. The entire lower part can be made of an SMC material, with the exception of the bottom plate.

The transition section may extend from the side of the bottom plate in the plane of the bottom plate. However, it would also be conceivable to manufacture the bottom plate with a straightened edge on which the transition section joins.

In a preferred embodiment, fastening elements for fixing the energy accumulator are arranged in the lower part, the fastening elements being embedded in the lower part. It is in this way possible to provide, already during manufacture, fixing points for the energy accumulator in the battery case, which simplifies the mounting of the energy accumulator in the finished battery case.

The fastening elements are for example arranged radially outside the bottom plate. The fastening elements may for example be threaded sleeves which receive screws provided on the energy storage device.

The bottom plate is preferably provided with a covering on the rear face diverted from the housing space, the refrigerant pipes being arranged between the rear face of the bottom plate and an internal face of the covering. which is turned towards the bottom plate. The refrigerant lines can thus easily be integrated into the battery box.

Particularly advantageously, the refrigerant lines are formed by sections of channels molded on the inner face of the covering. Thanks to the connection between the cover and the bottom plate, the channel sections are closed vis-à-vis the environment, whereby the refrigerant pipes are made. Thus, the coolant can be directly guided through the channel sections, and other coolant lines below the bottom plate can be omitted.

It is also necessary to manufacture the covering in an SMC material and to exploit its good formability. The channel sections are for example determined by a ribbed structure which can be produced simply by shaping an SMC plate before it hardens.

To create a fluid-tight connection between the covering and the lower part, the covering can be connected to the lower part in a fluid-tight manner in a connecting section, in particular by gluing.

The connecting section and the transition section are then for example superimposed, so that the covering is circumferentially connected, preferably glued to the lower part in the recessed area of the bottom plate.

The channel sections are preferably coated with a metal sheet along the covering, which must be made of the same material as the bottom plate, therefore in particular aluminum.

The metal sheet can for example be bonded to the inner face of the covering on the face facing the covering.

On its lateral edges, the metal sheet is advantageously directly connected to the bottom plate in a fluid-tight manner, for example by brazing, so that the refrigerant in the channel sections comes into contact only with the plate background and metallic foil. In this way, the inner face of all the walls of the coolant pipes is made of metal, and the components in the environment of the channel sections and in particular the connection between the covering and the lower part are protected against corrosion by the refrigerant.

The lower part and the upper part of the box can each be provided with radially projecting fixing structures for attachment to one another.

It is possible to insert the lower part together with the covering in a support component which is made in a deformable manner and sufficiently robust to offer the battery case protection against a mechanical charge, for example in collision situations , and against wear. The attachment of the box to the support component can be carried out by the fixing structures.

The invention also relates to a vehicle comprising a battery box as described above.

In the following, the invention will be described in more detail by means of an exemplary embodiment with reference to the accompanying drawings. These show:

- Figure 1 a schematic sectional view of a section of a battery case according to the invention;

- Figure 2 an enlargement of detail of Figure 1; and [0037] - Figure 3 a schematic exploded representation of a battery case according to the invention.

The figures show a battery box 10 in a vehicle (not shown) fully or partially electrically driven. The battery box 10 is shown in a possible mounting position.

The battery box 10 is substantially composed of an upper part 12 and a lower part 14 manufactured separately from the latter, which together form a box 16 which is closed vis-à-vis the environment and which encloses a housing space 17. To close the box 16, the upper part 12 is placed on the lower part 14 along a dividing line which is not shown in detail (see also FIG. 3).

In this example, the box 16 is inserted into a separate non-deformable support component 18 which also serves as collision protection for the entire battery box 10. For this purpose, the support component 18 has means suitable not shown in detail here. A robust reinforcement 20 for protection against wear is arranged on the rear face of the support component 18. The support component 18 is only optionally part of the battery case 10.

An energy accumulator 22 is able to be inserted into the box 16.

The lower part 14 of the box 16 comprises a metal bottom plate 24 which is for example made of a non-deformable aluminum sheet and which has good thermal conductivity.

The energy accumulator 22 is substantially in direct contact with a front face 26 of the bottom plate 24, so that it is possible to evacuate thermal energy from the energy accumulator 22 via the bottom plate 24.

A rear face 28 of the bottom plate 24 which is arranged on the side of the bottom plate 24 which is diverted from the housing space 17 is covered with a cover 30, the refrigerant lines 34 being provided in the intermediate space between an inner face 32 of the covering 30 and the rear wall 28 of the bottom plate 24.

The cover 30 is circumferentially connected to the lower part 14 in a connecting section 36, in this case by means of a bonding connection 38 (see Figures 1 and 2).

In the example shown here, the covering 30 is composed of an SMC plate shaped before hardening, in which an appropriate ribbed structure defining a plurality of channel sections is inserted. The refrigerant lines 34 are formed in that the ribbed structure rests on the rear face 28 of the bottom plate 24 and thus forms sections of separate channels. The ribbed structure is of course then chosen so that all of the channel sections are connected to one another so as to be able to guide the refrigerant from an inlet to an outlet (not shown). A flow of coolant is thus obtained along the rear face 28 of the bottom plate 24, which generates a regular cooling effect on the surface of the bottom plate 24. This is illustrated by the arrows in FIG. 3 .

The channel sections are here coated with a metal sheet 39, in this example of an aluminum sheet (see Figure 2). The lateral edges 41 of the metal sheet 39 extend to the rear face 28 of the bottom plate 24 and are directly connected to the bottom plate 24, for example by soldering. The metal sheet 39 is also fixed, in particular glued to the inner face 32 of the covering 30.

The cooling channels 34 are thus entirely surrounded by metal in the region of the bottom plate 24, and the refrigerant does not come into contact with components in the environment.

The coolant lines 34 are adapted to be connected at their inlet and their outlet to a vehicle cooling system in which the battery box 10 is mounted, via connections (not shown in detail). ).

The lower part 14 of the box 16 and the covering 30 with the refrigerant lines 34 formed between them together form the cooling system for the energy accumulator 22.

The bottom plate 24, along its peripheral edge 40, is embedded in the lower part 14, more precisely in a transition section 42 surrounding the peripheral edge 40 of the bottom plate 24. This is shown so more detailed in figure 2.

In this example, the lower part 14 is substantially composed of the bottom plate 24, the transition section 42 and a side wall 44 joining the transition section 42.

The side wall 44 and the transition section 42 are here made in one piece and made of an SMC material by shaping.

In this example, the embedding of the bottom plate 24 in the lower part 14 is carried out in that the transition section 42 extends circumferentially along the front face 26 and the rear face 28 of the bottom plate 24 in the area of the peripheral edge 40 of the bottom plate 24 and thus engages around the peripheral edge 40, so that the latter is covered on either side by the material of the transition section 42 (see figure 2). This connection is undeformable and fluid-tight all along the peripheral edge 40.

The connecting section 36 and the transition section 42 are here superimposed.

Fastening elements 46 for fixing the energy accumulator 22 are provided radially outside the bottom plate 24, in the side wall 44 of the lower part 14. In this example, the fastening elements 46 are embedded in the material of the lower part 14, for example by inserting, before hardening, threaded sleeves in the material SMC of the lower part 14.

The energy accumulator 22 has here, as conventionally known, structures for the reception of screws 48 which are capable of being screwed into the threaded sockets, to fix the energy accumulator 22 integrally in the lower part 14 before closing the box (see FIG. 1).

Several fastening structures 50 radially projecting by means of which the upper part 12 and the lower part 14 can be connected to each other are provided along the connecting line between the lower part 14 and the part top of box 16 (see Figure 1). Here, the support component 18 also has corresponding fixing structures in the appropriate places, so that the box 16 can be attached to the support component 18. A screw connection can for example be provided for the fastener.

Claims (1)

Claims [Claim 1] Battery box (10), in particular for an at least partially electrically driven vehicle, comprising an upper part (12) and a lower part (14) together forming a box (16) closed in which a housing space (17) is provided in which an electric energy accumulator (22) is able to be inserted, and comprising refrigerant lines (34) which are integrated in the housing battery (10), the lower part (14) comprising a side wall (44) and a metal bottom plate (24) which are connected to each other by a transition section (42), the side wall ( 44) and the transition section (42) being made of a plastic material, and the bottom plate (24) being made in the form of a support for the energy accumulator (22), being turned towards the housing space (17) with its front face (26) and towards the coolant pipes (34) with its rear face (28), and being embedded in the transition section (42) along its peripheral edge (40). [Claim 2] Battery case (10) according to claim 1, characterized in that the transition section (42) and the side wall (44) merge in one piece with one another. [Claim 3] Battery box (10) according to one of the preceding claims, characterized in that attachment elements (46) for fixing the energy accumulator (22) are arranged in the lower part (14), the fastening elements (46) being embedded in the material of the lower part (14). [Claim 4] Battery box (10) according to one of the preceding claims, characterized in that the bottom plate (24) is provided with a covering (30) on the rear face (28) which is diverted from the housing space (17 ), the coolant lines (34) being arranged between the rear face (28) of the bottom plate (24) and an inner face (32) of the cover (30) which faces the bottom plate (24) ). [Claim 5] Battery box (10) according to claim 4, characterized in that the coolant lines (34) are sections of channels molded on the inner face (32) of the cover (30). [Claim 6] Battery box (10) according to one of claims 4 or 5, characterized in that the covering (30) is made of an SMC material. [Claim 7] Battery box (10) according to one of claims 4 to 6, characterized in that the cover (30) is connected to the lower part (14) of fluid tight in a connecting section (36). [Claim 8] Battery box (10) according to claim 7, characterized in that the cover (30) is connected to the lower part (14) in the connecting section (36) by gluing. [Claim 9] Battery box (10) according to one of claims 7 and 8, characterized in that the connecting section (36) and the transition section (42) are superimposed. [Claim 10] Battery box (10) according to one of the preceding claims, characterized in that the lower part (14) and the upper part (12) each have radially projecting fixing structures (50) for the attachment one to the other. [Claim 11] Battery box (10) according to one of the preceding claims, characterized in that the side wall (44) and the transition section (42) are made of an SMC material. [Claim 12] Vehicle comprising a battery box (10) according to one of the preceding claims. 1/3