MOTOR VEHICLE TRACTION BATTERY ASSEMBLY

Abstract

A motor vehicle traction battery assembly has a battery control unit and battery modules. Each battery module includes a degassing opening. A plurality of busbars is arranged in a rail tunnel, to which the battery modules are electrically connected. The rail tunnel is fluidly shielded by a tunnel lid. The battery control unit includes an interior having a gas-tight battery control unit housing body in which connection rails and an electronic battery controller are accommodated. The electrical connections between the busbars and the connection rails are formed by vertical contact bodies, which pass through a connection opening lying in the horizontal plane between the rail tunnel and the battery control unit interior. The connection opening is fluidly sealed by a sealing wall, through which the contact bodies pass in a fluid-tight manner.

Claims

1. A motor vehicle traction battery assembly comprising: a battery control unit comprising a gas-tight battery control unit housing body defining an interior that is sized to accommodate connection rails and an electronic battery controller; a plurality of battery modules, each comprising a degassing opening and each being electrically connected to the battery control unit; a rail tunnel extending in a longitudinal vehicle direction that directly abuts the battery modules; a tunnel lid fluidly shielding the rail tunnel; and a plurality of busbars arranged in the rail tunnel, the busbars being electrically connected to the battery modules, wherein electrical connections between the busbars and the connection rails are formed by vertical contact bodies, which pass through a connection opening lying in a horizontal plane between the rail tunnel and the battery control unit interior, and wherein the connection opening is fluidly sealed by a sealing wall, through which the vertical contact bodies pass in a fluid-tight manner.

2. The motor vehicle traction battery assembly according to claim 1, wherein the sealing wall is a plastic body.

3. The motor vehicle traction battery assembly according to claim 2, wherein the sealing wall forms insulation shells, which respectively surround pin-like bodies of the vertical contact bodies.

4. The motor vehicle traction battery assembly according to claim 2, wherein the sealing wall comprises a stiffening element embedded in the plastic body.

5. The motor vehicle traction battery assembly according to claim 1, wherein the battery control unit further comprises at least one non-shielded contactor switch.

6. The motor vehicle traction battery assembly according to claim 1, wherein the sealing wall forms a flange seal between a flange of the tunnel lid and a mating flange of the battery control unit housing body.

7. A motor vehicle comprising the motor vehicle traction battery assembly of claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] An exemplary embodiment of the invention will be explained in further detail in the following with reference to the drawings. The figures show:

[0019] FIG. 1 a perspective view of a motor vehicle traction battery assembly having twelve battery modules and a front-face battery control unit,

[0020] FIG. 2 a vertical cross-section II-II of the battery control unit of FIG. 1, and FIG. 3 a vertical longitudinal section III-III of the traction battery assembly of FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

[0021] The figures show a motor vehicle traction battery assembly 10, which is formed substantially by two longitudinal rows 20′, 20″, each having six battery modules 20 and one battery control unit 50 centrally abutting the two battery module longitudinal rows 20′, 20″.

[0022] All battery modules 20 and battery control unit 50 lie on a single horizontal plane XY. The battery modules 20, which are identical to one another, are each elongated in the shape of a flat bolt, wherein their small end faces 21 lie in the vertical longitudinal plane XZ. The proximal end faces 21 of the battery modules 20 each have a degassing opening 22, through which the battery modules 20 can degas into a rail tunnel 14.

[0023] Above the battery modules 20, there is provided the rail tunnel 14, which extends in the longitudinal vehicle direction X and in which a plurality of busbars 16 are arranged in the longitudinal direction, with which the battery modules 20 are each directly or indirectly electrically connected. The rail tunnel 14 is shielded against the environment in a fluid-tight manner by a lid 18 that is centered with respect to the vehicle, elongated, and positioned on top. Beneath the battery modules 20 and the battery control unit 50, an actively liquid-cooled heat sink plate 12 is provided.

[0024] In an interior 53 consisting of a gas-tight metal housing body 52, the battery control unit 50 comprises an electronic battery controller 54 comprising a plurality of contactor switches 56. The battery controller 54 comprises connection rails 58 corresponding to the busbars 16, which rails are electrically connected to one another by a vertical and electrically conductive contact body 30. With its upper end, the contact body 30 is inserted, for example pressed, into a respective receptacle 32, which is connected to the relevant busbar 16.

[0025] As shown in FIGS. 2 and 3, a connection opening 55 lying in the horizontal plane XY is defined between the rail tunnel 14 and the battery control unit interior 53, through which opening the vertical contact bodies 30 pass.

[0026] A fluid-tight sealing wall 40 is arranged in the connection opening 55, which fluidly seals the connection opening 55 so that no gases can enter the battery control unit interior 53 from the rail tunnel 14.

[0027] The sealing wall 40 is formed by a plastic body 40′, which also forms cylindrical contact sleeves 34, which completely wrap the cylindrical pin-like contact bodies 30 over their circumference and vertical extension, respectively. In the sealing wall plastic body 40′, there is embedded a laminar, metal stiffening element 44 that lies in a horizontal plane XY and stiffens the sealing wall 40 in the normal direction.

[0028] The sealing wall 40 further forms a flange seal between a flange 18″ of the portion 18′ of the tunnel lid 18 protruding from the connection opening 55 and a corresponding mating flange 23 of the battery control unit housing body 52. The two flanges 18″, 23 are vertically tensioned with one another by flange bolts 19.