LIQUID-COOLED MOTOR VEHICLE TRACTION BATTERY MODULE

Abstract

A liquid-cooled motor vehicle traction battery module with a rigid and fluid-tight module housing in which a plurality of plate-like identical battery cells are accommodated. A plurality of identical deformable compression elements are provided between the battery cells and the battery cells are cooled by module-internal liquid cooling. Rigid cooling plates, which have cooling ducts for cooling liquid, are arranged between two mutually adjacent battery cells. Either a cooling plate or a compression element, against which the battery cells respectively directly bear, is in each case alternately arranged between two mutually adjacent battery cells.

Claims

1. A motor vehicle traction battery module comprising: a rigid and fluid-tight module housing, a plurality of identical battery cells positioned within the housing, wherein the battery cells are configured to be cooled by module-internal liquid cooling, a plurality of identical deformable compression elements disposed between battery cells, and rigid cooling plates, which have cooling ducts for cooling liquid, arranged between two mutually adjacent battery cells.

2. The motor vehicle traction battery module as claimed in claim 1, wherein the module housing has a plurality of wall panels which are parallel to one another and to the battery cells, wherein the compression elements bear against the respective wall panels and one of the battery cells bears directly against one of the compression elements.

3. The motor vehicle traction battery module as claimed in claim 1, wherein the compression elements are in the form of plates.

4. The motor vehicle traction battery module as claimed in claim 1, wherein two planar surfaces of the cooling plates make contact with the respectively adjacent battery cells.

5. The motor vehicle traction battery module as claimed in claim 1, wherein the compression elements are each adhesively bonded to at least one of the two adjacent battery cells.

6. The motor vehicle traction battery module as claimed in claim 1, wherein the cooling fluid flowing in the cooling plate cooling ducts is a dielectric liquid which directly cools the battery cells.

7. The motor vehicle traction battery module as claimed in claim 1, wherein wall panels of the module housing, which are parallel to one another, are formed in one piece with one another and are part of an extrusion profile.

8. The motor vehicle traction battery module as claimed in claim 1, wherein a separate structural component composed of glass fiber-reinforced composite material is arranged between a wall panel and a neighboring compression element.

9. A motor vehicle comprising the motor vehicle traction battery module of claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] An exemplary embodiment of the invention will be explained in more detail below with reference to the drawing.

[0016] The sole FIGURE shows a diagrammatic and perspective view of a vertical cross section through a motor vehicle traction battery module.

DETAILED DESCRIPTION OF THE INVENTION

[0017] The sole figure shows a perspective view of a vertical cross section through a motor vehicle traction battery module 10 with a rigid and fluid-tight metal module housing 20. The rated voltage of the traction battery module 10 is, for example, 400 V or 800 V, and therefore is what is known as a high-voltage traction battery module. In the present case, “fluid-tight” is to be understood to mean that cooling liquid connections are provided but otherwise the module housing 20 is fluid-tight. The traction battery module 10 is rectangular and elongate in the vehicle transverse direction Y. In the present case, the sectional plane shown lies in a vertical transverse plane XZ of the traction battery module 10, that is to say in a vertical longitudinal plane of the motor vehicle in question.

[0018] A top wall 21 situated at the top in a horizontal plane, a lower bottom wall 23 situated in a horizontal plane, a wall panel 22 designed as a side wall and a wall panel 22′ forming a central separating wall of the module housing 20 are illustrated. The right-hand side wall panel is not illustrated. All of the wall panels 22, 22′, the bottom wall 23 and the top wall 21 are formed in one piece with one another and are parts of a metal extrusion profile which is closed by corresponding covers at both of its end sides. The separating wall wall panel 22′ divides the interior of the module housing 20 into two halves which are mirror-inverted with respect to the separating wall wall panel 22′. All of the wall panels 22, 22′ lie in a vertical transverse plane YZ.

[0019] Each of the two module housing halves is filled between the wall panels 22, 22′ delimiting them in each case, in each case in accordance with a specific stacking pattern with a plurality of battery cells 30, 30′, a plurality of deformable compression elements 40, 40′, a plurality of cooling plates 50 and two plate-like structural components 70.

[0020] The mutually identical battery cells 30, 30′ are in the form of what are known as pouch cells and each have a cell voltage of 30-100 V.

[0021] The cooling plates 50 are all of identical design to one another. Each cooling plate 50 is is formed by a cooling plate body 51 in which cooling ducts 52 running linearly in the vehicle transverse direction Y are provided for the cooling liquid flowing through the traction battery module 10. The two large surfaces 53 of each cooling plate 50 are of smooth and planar design, and do not have any sharp edged projections. The cooling liquid is an electrically non-conductive dielectric liquid, for example a suitable oil.

[0022] The plate-like and elastically deformable compression elements 40, 40′ are also all of identical design to one another in each case and are formed by a suitable elastic and full-surface-area plastic body 41.

[0023] The structural component 70 adjoins each vertical wall panel 22, 22′ in each case, is likewise of plate-like design and is formed by a plate-like body 71 composed of a glass fiber-reinforced composite material.

[0024] The structural components 70, the battery cells 30, 30′, the compression elements 40, 40′ and the cooling plates 50 are all parallel to one another in a vertical transverse plane YZ and each have approximately the same base area. The abovementioned elements are arranged in a specific sequence and order in relation to one another: either a cooling plate 50 or a compression element 40, 40′ is respectively alternately arranged between two mutually adjacent battery cells 30, 30′, wherein the battery cells 30, 30′ are each arranged so as to bear directly against the cooling plate 50 in question or directly against the compression element 40, 40′ in question. The plate-like structural component 70 is respectively arranged between a compression element 40′ indirectly adjoining a wall panel 22, 22′ and the wall panel 22, 22′ in question.

[0025] For easier assembly, all of the battery cells 30, 30′ are each adhesively bonded to an adjoining compression element 40, 40′ before assembly. It goes without saying that larger units including a cooling plate 50 can also already be combined with other elements by means of appropriate adhesive bonding to form an assembly unit before assembly.