TRACTION BATTERY FOR AN ELECTRICALLY OR SEMI-ELECTRICALLY DRIVEN VEHICLE

Abstract

A traction battery for an electrically or semi-electrically driven vehicle. The traction battery includes at least one temperature sensor. The temperature sensor is configured as an infrared sensor and includes a sensor array having several sensor elements for spatially resolved detection of the temperature of a surface of one or more components of the traction battery. A deflection optic is arranged between the respective surface and the sensor array, via which optic the temperature sensor detects the respective surface.

Claims

1. A traction battery for an electrically or semi-electrically driven vehicle, wherein the traction battery comprises: at least one temperature sensor in the form of an infrared sensor that includes a sensor array having several sensor elements for spatially resolved detection of a temperature of a surface of one or more components of the traction battery, and a deflection optic arranged between the surface and the sensor array, wherein the temperature sensor detects the surface via the deflection optic.

2. The traction battery according to claim 1, wherein the deflection optic comprises a mirror or is formed by a mirror.

3. The traction battery according to claim 2, wherein the mirror is configured as a metal foil mirror.

4. The traction battery according to claim 2, wherein the mirror is metallically coated.

5. The traction battery according to claim 1, wherein the deflection optic is configured so as to cause a beam deflection of 70° to 110°.

6. The traction battery according to claim 1, wherein the temperature sensor comprises a mapping optic for mapping the surface to be measured onto the sensor array, wherein the deflection optic is arranged between the mapping optic of the temperature sensor and the surface.

7. The traction battery according to claim 1, wherein the one or more components of the traction battery is selected from a group consisting of: a battery cell, a battery module comprising several interconnected battery cells, a module connector, a contactor, a power bus, a connector, a current sensor, and a fuse.

8. The traction battery according to claim 1, wherein the surface of the component detected by the temperature sensor includes a coating, wherein a material of the coating has a higher emissivity than the coated material, wherein the material of the coating has a predetermined emissivity of more than 0.8 in an area of the infrared spectrum relevant to the infrared sensor.

9. The traction battery according to claim 1, wherein the traction battery comprises a battery module having several battery cells, wherein the battery module comprises a battery module housing, wherein the battery cells are arranged so as to be stacked one behind the other in a stacking direction (Y) in the battery module housing, wherein the temperature sensor detects a temperature of the respective surface of one or more of the battery cells via the deflection optic, wherein the temperature sensor and the deflection optic are arranged in the battery module housing.

10. The traction battery according to claim 9, wherein the infrared sensor is arranged such that an optical axis of the infrared sensor runs either parallel or approximately parallel to the stacking direction (Y) of the battery cells.

11. The traction battery according to claim 9, wherein the temperature sensor detects the temperature of the respective surface of all battery cells of the battery module via the deflection optic.

12. The traction battery according to claim 1, wherein the traction battery comprises a battery module having several battery cells, wherein the battery module comprises a battery module housing, wherein the battery cells are arranged so as to be stacked one behind the other in a stacking direction (Y) in the battery module housing, wherein the temperature sensor detects a temperature of the respective surface of one or more of the battery cells via the deflection optic, wherein the temperature sensor and the deflection optic are arranged outside of the battery module housing, wherein the battery module housing comprises one or more measurement openings that are permeable to infrared beams.

13. The traction battery according to claim 12, wherein the infrared sensor is arranged such that an optical axis of the infrared sensor runs either parallel or approximately parallel to the stacking direction (Y) of the battery cells.

14. The traction battery according to claim 12, wherein the temperature sensor detects the temperature of the respective surface of all battery cells of the battery module via the deflection optic.

15. A motor vehicle comprising the traction battery of claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In the following figures, the invention is explained in further detail with reference to embodiment examples, without being limited thereto. Here:

[0044] FIG. 1 shows an embodiment of the invention in a schematic representation,

[0045] FIG. 2 shows a second embodiment of the invention in a schematic representation in a view according to arrow II in FIG. 3,

[0046] FIG. 3 shows the second embodiment of the invention in a schematic representation in a view according to arrow III in FIG. 2,

[0047] FIG. 4 shows a further embodiment of the invention in a schematic representation.

DETAILED DESCRIPTION OF THE INVENTION

[0048] In FIGS. 1 to 4, the invention is only shown schematically for reasons of better understanding. The size ratios of the components shown in the figures do not correspond to reality. If the components were to be correctly represented, i.e. with correctly reproduced size ratios, the understanding of the present invention would be more difficult, so that such a representation is omitted.

[0049] FIG. 1 shows a traction battery, wherein said traction battery shows an arrangement for measuring the temperature of a surface 1 of a battery module 2 of the traction battery formed in the vehicle vertical direction Z. To measure the temperature of the surface 1 of the battery module 2, the traction battery comprises a temperature sensor, wherein this temperature sensor is, in the present case, configured as an infrared sensor 3, thus detecting the infrared radiation radiated from the surface 1. By means of an electronic evaluation system, not shown in greater detail, the temperature of the surface 1 and thus the battery module 2 can be adjusted based on the measured infrared radiation. In order to achieve a spatially resolved detection of the temperature of the surface 1, the infrared sensor 3 comprises a sensor array having several sensor elements. In the present case, the sensor elements are arranged in a 2D matrix arrangement.

[0050] The infrared sensor 3 is not aimed directly at the surface 1 of the battery module 2, but rather a deflection optic is arranged between the infrared sensor 3 and the surface 1, wherein this deflection optic is, in the present case, formed by an infrared mirror 4. In the present case, the deflection mirror 4 causes a deflection of the beam path 5 by approximately 90°. Accordingly, an optical axis of the infrared sensor 3 is configured in the vehicle longitudinal direction X, wherein, by the deflection of the beam path 5 on the deflection mirror 4, the surface 1 facing in the vehicle vertical direction Z is mapped onto the sensor array of the infrared sensor 3.

[0051] FIGS. 2 and 3 show a further embodiment of the invention in a schematic view, wherein, in this embodiment, the surfaces 1 of several battery cells 6 of a battery module 2 are detected by means of the infrared sensor 3. The battery cells 6 are arranged one behind the other arranged in a stacked manner in the vehicle transverse direction Y, as shown schematically in FIGS. 2 and 3. The battery cells 6 are arranged in a battery module housing 7 of the battery module 2, wherein both the infrared sensor 3 and the deflection mirror 4 are also arranged in the battery module housing 7. In the present case, the infrared sensor 3 and the mirror 4 are mounted on the inside of an upper housing wall of the battery module housing 7.

[0052] FIG. 4 shows a further embodiment of the invention in a schematic representation, wherein this embodiment differs substantially from the embodiment shown in FIGS. 2 and 3 in that the mirror 4 and the infrared sensor 3 are arranged outside of the battery module housing 7. For example, the mirror 4 and the infrared sensor 3 can be mounted on a battery housing, not shown in detail, of the traction battery. To enable a measurement of the surfaces 1 of the battery cells 6, the module housing 7 has a measurement opening, wherein this measurement opening is closed by a measurement window 8, wherein this measurement window 8 is permeable to infrared radiation in the wavelength range detectable by the infrared sensor 3. Furthermore, the surface 1 of the respective battery cell 6 detected by the infrared sensor 3 is provided with a coating 9, which has an emissivity of greater than 0.8 in the range of the infrared spectrum that is relevant to the infrared sensor 3 and, accordingly, has a higher emissivity than the coated material of the respective cell 6.

LIST OF REFERENCE NUMBERS

[0053] 1 Surface [0054] 2 Battery module [0055] 3 Infrared sensor [0056] 4 Mirror [0057] 5 Radiation path [0058] 6 Battery cells [0059] 7 Battery module housing [0060] 8 Measurement window [0061] 9 Coating