MOTOR VEHICLE COMPRISING A TRACTION BATTERY MODULE

Abstract

A motor vehicle includes a traction battery module which has a hermetically sealed module housing in which at least one cell stack pair including a left-hand-side and a right-hand-side cell stack including, in each case, at least two battery cells is accommodated. The traction battery module is arranged in the vehicle floor and extends symmetrically in relation to the vehicle center (M) in the vehicle transverse direction (X). The traction battery module has a bottom wall in a horizontal plane. A gas space is formed in the module housing in the vehicle center (M) and between the left-hand-side cell stack and the right-hand-side cell stack with respect to the vehicle transverse direction (X). The module bottom wall has a degassing element centrally in the vehicle in the region of the gas space.

Claims

1. A motor vehicle comprising a traction battery module, the traction battery module comprising: a hermetically sealed module housing, at least one cell stack pair including a left-hand-side cell stack and a right-hand-side cell stack accommodated in the module housing, wherein each cell stack includes at least two battery cells, wherein the traction battery module is arranged in a vehicle floor, extends symmetrically with respect to a vehicle center (M) in a vehicle transverse direction (X) and has a bottom wall in a horizontal plane, a gas space formed in the module housing in the vehicle center (M) and between the left-hand-side cell stack and the right-hand-side cell stack with respect to the vehicle transverse direction (X), and wherein the module bottom wall includes a degassing element located centrally in the vehicle in the region of the gas space.

2. The motor vehicle as claimed in claim 1, wherein the gas space is substantially cuboidal and has a width (B) of at least 10 cm in the vehicle transverse direction (X).

3. The motor vehicle as claimed in claim 1, wherein the gas space is substantially cuboidal and has a width (B) of at most 30 cm in the vehicle transverse direction (X).

4. The motor vehicle as claimed in claim 1, wherein the gas space is substantially cuboidal and extends over the entire vertical extent of the cell stacks in a vertical direction (Z).

5. The motor vehicle as claimed in claim 1, wherein the gas space is substantially cuboidal and extends over an entire longitudinal extent (L) of one of the cell stacks in a vehicle longitudinal direction (Y).

6. The motor vehicle as claimed in claim 1, wherein the degassing element is a gas-tight rupture disk.

7. The motor vehicle as claimed in claim 1, further comprising a planar and liquid-cooled cooling base which (i) has a degassing opening, (ii) is disposed centrally in the vehicle, in vertical alignment with the degassing element, and (iii) is arranged below the module bottom wall.

8. The motor vehicle as claimed in claim 1, further comprising at least two cell stack pairs arranged adjacent to one another as seen in a vehicle longitudinal direction (Y), wherein the two gas spaces are insulated from one another in a gas-tight manner and a dedicated degassing element is respectively associated with each gas space.

9. The motor vehicle as claimed in claim 1, wherein four side walls of the module housing are formed in one piece from an extrusion profile.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] An exemplary embodiment of the invention will be explained in more detail below with reference to the drawings, in which:

[0012] FIG. 1 schematically shows a motor vehicle comprising a traction battery module in the vehicle floor,

[0013] FIG. 2 shows a cross section through the traction battery module of FIG. 1,

[0014] FIG. 3 shows a horizontal section through the traction battery module of FIGS. 1 and 2, and

[0015] FIG. 4 shows a bottom vehicle-floor view of a cooling base below the traction battery module of FIGS. 1-3.

DETAILED DESCRIPTION OF THE INVENTION

[0016] FIG. 1 schematically shows a motor vehicle 100 comprising an electric traction motor 104 which, in the vehicle floor 102, has a plurality of traction battery modules 10 which together form the traction battery of the motor vehicle 100. The direction of travel of the motor vehicle 100 is the vehicle longitudinal direction Y, the transverse direction is the vehicle transverse direction X and the vertical of said motor vehicle is the vehicle vertical axis Z.

[0017] Each traction battery module 10 has two cell stack pairs 600, 600′ in each case consisting of a left-hand-side cell stack 60 and a right-hand-side cell stack 60′, wherein the left-hand-side cell stack 60 is located in the left-hand-side vehicle half to the left of the vehicle center M and the right-hand-side cell stack 60′ is located in the right-hand-side vehicle half to the right of the vehicle center M. The traction battery module 10 extends substantially over most of the width of the vehicle floor 102. Each cell stack 60, 60′ in each case consists of a plurality of battery cells 62 which, in the present case, are in a vertical transverse plane, so that a proximal narrow side of each battery cell 62 adjoins a cuboidal gas space 66 that is disposed centrally in the module and constitutes a clearance which is not filled with a solid substance. The gas space 66 extends over the entire longitudinal extent in the longitudinal direction and over the entire vertical extent of the adjoining two cell stacks 60, 60′ in the vertical direction. The cuboidal gas space 66 has a width B of, for example, 20 cm in the vehicle transverse direction X.

[0018] The cuboidal metal module housing 20 that provides sealing in gas-tight manner has a left-hand-side side wall 21, a right-hand-side side wall 22, a top wall 25, a bottom wall 26, a front end wall 23 and a rear end wall 24. The module housing 20 is partially formed by an extrusion profile body which forms the four long housing walls 21, 22, 25, 26 and a separating wall 80, while the left-hand-side side wall 21 and right-hand-side side wall 22 of relatively small surface area were mounted on the extrusion profile body in a gas-tight manner, for example by welding, after insertion of the two cell stack pairs 600, 600′ into the profile body.

[0019] With respect to the transverse direction x, a degassing element 30, which is gas-tight in principle but is configured in such a way that it is permanently destroyed when a defined differential pressure between the gas space 66, 66′ and the outside atmospheric pressure is exceeded, is in each case arranged in the region of the vehicle center M and approximately in the center of the respective gas space 66, 66′ in the bottom wall 26. The degassing element 30 is formed in each case by a rupture disk 32 which is seated in a degassing opening 28 of the bottom wall 26 in a gas-tight manner.

[0020] A liquid-cooled cooling base 40, which is actively cooled approximately over the entire surface area by a cooling liquid 44 flowing through a cooling duct 42, is arranged adjoining the bottom of the bottom wall 26 of the module housing 20. The cooling base 40 is thermally coupled over the entire surface area to the module housing bottom wall 26, so that most of the heat generated by the traction battery module 10 is dissipated via the cooling base 40 in the charging mode or in the traction mode. The cooling base 40 has a corresponding degassing opening 46, through which the gas can escape from the gas space 66 perpendicularly downward to the vehicle center in the case of degassing, in vertical alignment with the degassing element 30.

[0021] It can be seen in the horizontal section of FIG. 3 that the outer module housing 20 contains two cell stack pairs 60, 60′ which are separated from one another in a gas-tight manner by the separating wall 80 that is in a vertical transverse plane, so that a dedicated gas space 66, 66′ and a dedicated degassing element 30, 30 are associated with each cell stack pair 600, 600′.