Traction battery for an electrically powered vehicle and corresponding vehicle

Abstract

Traction battery (10) for an electrically powered vehicle, having the following features: - the traction battery (10) comprises at least one layer (11) of battery cells for storing electrical energy and - the traction battery (10) has two inlet channels (14) on the housing side and an outlet channel (16) fluidically connected to the inlet channels (14) for conducting coolant through the layer (11), characterized by the following features: - the traction battery (10) has on the housing side a reversing collector (15) connecting the inlet channels (14) to the outlet channel (16) for diverting the coolant, - the battery cells each comprise an elongated can and two poles arranged at the front of the can, - the inlet channels (14) and the outlet channel (16) are arranged on the one hand in layer (11) and the reversing collector (15) is arranged on the other hand in layer (11), - the inlet channels (14) are arranged to guide the coolant over the poles and - the outlet channel (16) is suitably arranged to guide the coolant over the cans.

Description

[0001] The present invention relates to a traction battery for an electrically powered vehicle according to the preamble of claim 1. The present invention further relates to a correspondingly equipped vehicle. State of the art

[0002] The traction battery of an electric vehicle is known in the art. Several modules with multiple battery cells may be contained within the traction battery. The modules may be arranged side by side or one above the other, with the stacked module layers separated from each other by bases / covers / intermediate bases.

[0003] US 2011 / 0 189 521 A1 and DE 10 2014 216 698 A1 each disclose the subject matter of the preamble of claim 1.

[0004] DE 10 2009 035 470 A1 relates to a battery with a heat-conducting plate arranged in a battery housing for controlling the temperature of the battery. Several individual cells, electrically connected in parallel and / or series by means of cell connectors, are thermally connected to the heat-conducting plate. Insulating elements are arranged between the heat-conducting plate and the individual cells, surrounding the electrical terminal contacts of the individual cells in a sheath-like manner. When the individual cells are not mounted, the height of the insulating elements is greater than the height of the terminal contacts, so that the insulating elements project beyond the terminal contacts.

[0005] DE 10 2012 111 969 A1 relates to a battery arrangement for use in a motor vehicle with a battery housing in which at least two battery cells are arranged by means of a holding device, wherein the battery cells are electrically connected to one another via a cell connecting element, wherein a cooling arrangement for cooling the battery cells with a cooling medium is provided, which cooling arrangement has at least one flow chamber, a conveying device and a heat exchanger for the cooling medium, wherein the battery cells are arranged with their cell poles on the cell connecting element, wherein a printed circuit board is formed parallel to the cell connecting element and a second flow chamber is formed between the printed circuit board and the cell connecting element, wherein the printed circuit board has first openings in the region of the battery cells arranged on the cell connecting element.

[0006] DE 10 2011 009 000 A1 describes a heat exchanger for an electrochemical energy storage device, in which horizontal channels penetrate the energy storage device. The channels are arranged one above the other in several levels, with each level possibly having several horizontal channels, and are connected by supply and discharge channels.

[0007] DE 10 2009 029 629 A1 describes a heat exchanger for temperature control and support of battery units. This comprises several flat tubes that form a holding frame for accommodating the battery units.

[0008] US Pat. No. 8,298,699 B2 describes an energy storage device with a stacked structure, which has a plurality of holes perpendicular to the stacking direction through which coolant can flow through the structure. The holes are connected by lines, so that coolant is guided from a first hole to the next hole.

[0009] EP 0 177 225 B1 describes a stack of mainly flat battery cells with a cooling system, wherein coolant is directed parallel to the longer side of each cell. Disclosure of the invention

[0010] The invention provides a traction battery for an electrically powered vehicle and a correspondingly equipped vehicle according to the independent claims.

[0011] One advantage of this solution is the countercurrent cell cooling it achieves, dissipating the heat generated by the traction battery during vehicle operation into the environment. The cooling thus serves to protect the traction battery from overheating and maintain its temperature-dependent operating characteristics.

[0012] Further advantageous embodiments of the invention are specified in the dependent patent claims. Short description of the drawing

[0013] An embodiment of the invention is shown in the drawing and is described in more detail below.

[0014] The single figure shows the section of a traction battery according to the invention. Embodiments of the invention

[0015] The figure schematically illustrates the operating principle according to the invention using a cross-section of a traction battery 10 for an electrically powered vehicle. In the present example, the traction battery 10 comprises two layers 11, 12 of battery cells for storing electrical energy, adjacent to an intermediate floor 13 on either side. The battery cells each comprise an elongated can and two terminals arranged on the front side of the can and are combined into modules (not shown in the drawing). In the assembly shown, the modules, plugged together to form the upper layer 11, form a composite over which the cooling medium is conducted.

[0016] The traction battery 10 has, on the right side of its housing (as shown in the illustration), two inlet channels 14 and one outlet channel 16 for conducting the coolant through the layer 11. On the left side of the housing (as shown in the illustration), the traction battery 10 has an insert part fluidically connecting the inlet channels 14 to the outlet channel 16 with an integrated flow contour for deflection, which is referred to below as the reversing header 15.

[0017] After the inlet channels 14 have directed the coolant from right to left into layer 11 and over the poles, the reverse collector 15 directs the collected coolant in the opposite direction. The coolant then flows from left to right to the outlet channel 16 and is directed over the cell cans by its vertically centered arrangement with respect to layer 11.

Claims

[1] Traction battery (10) for an electrically powered vehicle, having the following features: - the traction battery (10) comprises at least one layer (11) of battery cells for storing electrical energy and - the traction battery (10) has two inlet channels (14) on the housing side and an outlet channel (16) fluidically connected to the inlet channels (14) for conducting coolant through the layer (11), characterized by following features: - the traction battery (10) has on the housing side a reversing collector (15) connecting the inlet channels (14) to the outlet channel (16) for diverting the coolant, - the battery cells each comprise an elongated can and two poles arranged at the front of the can, - the inlet channels (14) and the outlet channel (16) are arranged on the one hand in layer (11) and the reversing collector (15) is arranged on the other hand in layer (11), - the inlet channels (14) are arranged to guide the coolant over the poles and - the outlet channel (16) is suitably arranged to guide the coolant over the cans. [2] Traction battery (10) according to claim 1, characterized by following features: - the traction battery (10) comprises a base, cover or intermediate base (13) and - the layer (11) rests against the base, lid or intermediate base (13). [3] Traction battery (10) according to claim 1 or 2, characterized by following features: - the battery cells are combined into modules and - the modules are connected to the layer (11). [4] Vehicle, characterized by following feature: - the vehicle comprises a traction battery (10) according to one of claims 1 to 3 for operating the vehicle.

Images