Battery system

Abstract

A battery system (100) which comprises a metallic battery housing (200) and a metallic component housing (300), wherein at least one battery module (10) having at least one battery cell (12) and a control unit (20) for controlling and monitoring the at least one battery module (10) are arranged in the battery housing (200) and wherein at least one electrical component (80) is arranged in the component housing (300), which electrical component is electrically connected to the at least one battery module (10).

Claims

1. A battery system (100), comprising a metallic battery housing (200), and a metallic component housing (300), wherein at least one battery module (10) having at least one battery cell (12) and a control unit (20) for controlling and monitoring the at least one battery module (10) are arranged in the battery housing (200), wherein at least one electrical component (80) is arranged in the component housing (300) and is electrically connected to the at least one battery module (10), wherein the component housing (300) is arranged on the battery housing (200), wherein the component housing (300) and the battery housing (200) are mechanically connected to one another and electrically insulated from one another, wherein the battery housing (200) is connected to a first ground potential and the component housing (300) is connected to a second ground potential, wherein the first ground potential is different from the second ground potential, wherein a first temperature control device is formed between the battery housing (200) and the component housing (300), wherein the first temperature control device is insulated from the battery housing (200) and the component housing (300), wherein the first temperature control device includes a seal (330) between a battery housing upper part (220) and a component housing lower part (310), and wherein an area enclosed by the seal (330) between the battery housing upper part (220) and the component housing lower part (310) forms a first temperature control channel.

2. The battery system (100) according to claim 1, characterized in that the battery housing (200) and the component housing (300) are connected to one another in a cohesive or form-fitting manner.

3. The battery system (100) according to claim 1, characterized in that the battery housing (200) and/or the component housing (300) are in each case coated with an insulator (40).

4. The battery system (100) according to claim 1, characterized in that a disconnect switch unit (30) for disconnecting a discharging current or a charging current of the at least one battery module (10) is arranged in the battery housing (200).

5. The battery system (100) according to claim 1, characterized in that the battery housing (200) has a second temperature control device.

6. The battery system (100) according to claim 1, characterized in that the at least one electrical component (80) is a DC-DC converter.

7. The battery system (100) according to claim 2, characterized in that the battery housing (200) and/or the component housing (300) are in each case coated with an insulator (40).

8. The battery system (100) according to claim 7, characterized in that a disconnect switch unit (30) for disconnecting a discharging current or a charging current of the at least one battery module (10) is arranged in the battery housing (200).

9. The battery system (100) according to claim 8, characterized in that the battery housing (200) has a second temperature control device.

10. The battery system (100) according to claim 9, characterized in that the at least one electrical component (80) is a DC-DC converter.

11. A motor vehicle comprising at least one battery system (100) according to claim 1.

12. The motor vehicle according to claim 11, characterized in that the first ground potential is a floating potential.

13. The motor vehicle according to claim 12, characterized in that the second ground potential is equal to a potential of a body of the motor vehicle.

14. The motor vehicle according to claim 11, characterized in that the second ground potential is equal to a potential of a body of the motor vehicle.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Embodiments of the invention are explained in greater detail using the drawings and the following description.

(2) In the drawings:

(3) FIG. 1 shows a schematic sectional representation of a battery system according to the invention.

DETAILED DESCRIPTION

(4) FIG. 1 represents the subject matter of the invention merely schematically.

(5) FIG. 1 shows a schematic sectional representation of a battery system 100 according to the invention. In this case, the battery system 100 comprises a battery housing 200 made from cast aluminum which has a battery housing lower part 210 and a battery housing upper part 220 which is fitted on the battery housing lower part 210.

(6) The battery system 100 further comprises a component housing 300 made from cast aluminum which has a component housing lower part 310 and a component housing upper part 320.

(7) Furthermore, the battery system 100 comprises a battery module 10, a control unit 20 for controlling and monitoring the battery module 10 and a disconnect switch unit 30 for disconnecting a discharging current or a charging current of the battery module 10.

(8) The battery module 10 is arranged on a base 212 of the battery housing lower part 210 and in this case comprises a plurality of prismatic battery cells 12 arranged alongside one another which each have a positive terminal 13 and a negative terminal 14. FIG. 1 represents twelve battery cells 12, namely a first battery cell 121 to a twelfth battery cell 1212 when viewed from the left. More or less than twelve battery cells 12 can of course be arranged in the battery module 10. In this case, the battery cells 12 are electrically serially connected to one another by means of a plurality of cell connectors 15. In this case, the positive terminal 13 of the first battery cell 121 represents a positive terminal of the battery module 10 and the negative terminal 14 of the twelfth battery cell 1212 represents a negative terminal of the battery module 10.

(9) However, it is also conceivable for the battery cells 12 to be connected in parallel to one another.

(10) The control unit 20 is arranged on the battery module 10. In this case, the control unit 20 is electrically connected to the battery module 10 or the individual battery cells 12 for controlling and monitoring via a plurality of conductors 18.

(11) The disconnect switch unit 30 for disconnecting a discharging current or a charging current of the battery module 10 is arranged above the control unit 20.

(12) In this case, the disconnect switch unit 30 has a first connection 31 and a second connection (not represented). The first connection 31 is in this case electrically connected to the positive terminal 13 of the first battery cell 121, which represents the positive terminal of the battery module 10, by means of a connector 50.

(13) The component housing 300 is arranged on the battery housing upper part 220 of the battery system 100 according to the invention, in which component housing an electrical component 80, which can be designed as a DC-DC converter, is arranged. In this case, the component housing 300 has a component housing lower part 310 and a component housing upper part 320 which is fitted on the component housing lower part 310.

(14) In this case, the battery housing upper part 220 and the component housing lower part 310 are each equipped with a feedthrough (not represented) for current and signal transmission. The disconnect switch unit 30 is electrically connected to the electrical component 80 by way of the feedthroughs.

(15) In this case, the battery housing upper part 220 is coated with an insulator 40. The insulator 40 can be cathodic dip coating, for example. It is also conceivable to use hard adonizing or insulating adhesive tape. In this case, the insulator 40 can be coated exclusively on a surface of the battery housing upper part 220 which faces the component housing lower part 310. It is also conceivable for the battery housing upper part 220 to be completely coated with the insulator 40.

(16) The component housing lower part 310 is in this case also coated with the insulator 40. In this case, the insulator 40 can be coated exclusively on a surface of the component housing lower part 310 which faces the battery housing upper part 220. It is also conceivable for the component housing lower part 310 to be completely coated with the insulator 40.

(17) The battery housing lower part 210 and/or the component housing upper part 320 can advantageously also be coated with the insulator 40.

(18) The battery housing upper part 220, the component housing lower part 310 and the component housing upper part 320 are screwed together. In this case, the battery housing upper part 220 has a plurality of first fixing holes 222. The component housing lower part 310 has a plurality of second fixing holes 312 and the component housing upper part 320 has a plurality of third fixing holes 322. In this case, the second and third fixing holes 312, 322 are each designed as a through hole. Electrically non-conductive screws 90, such as plastic screws, for example, are used for fixing together the battery housing upper part 220, the component housing lower part 310 and the component housing upper part 320.

(19) A sealing cord 330 is placed between the component housing lower part 310 and the battery housing upper part 220. A first temperature control channel 403 in a first temperature control device 402 for transmitting a temperature control medium is designed in a region enclosed by the sealing cord 330 between the component housing lower part 310 and the battery housing upper part 220. In this case, the first temperature control channel 403 is insulated from the battery housing upper part 220 and the component housing lower part 310. The first temperature control device 402 can also be designed as a Peltier element unit 401.

(20) The battery housing 200 can have a second temperature control device. In this case, the second temperature control device can have a second temperature control channel for transmitting the temperature control medium, which can be designed in the material of the battery housing lower part 210 and/or the battery housing upper part 220. The second temperature control device can also be designed as a Peltier element unit 401. The second temperature control device which is designed as a Peltier element unit can be arranged on the base 212 of the battery housing lower part 210 and between the base 212 and the battery module 10.

(21) In this case, the first temperature control channel 403 can be serially connected in a hydraulic manner to the second temperature control channel, in order to form a common temperature control circuit.

(22) A potential of the negative terminal of the battery module 10, which is represented by the negative terminal 14 of the twelfth battery cell 1212, is selected as ground potential for the control unit 20.

(23) The potential of the negative terminal of the battery module 10 can also be selected for the first ground potential of the battery housing 200. However, it is also conceivable for the first ground potential to be a floating potential.

(24) A different potential is selected for the second ground potential of the component housing 300, which potential is different from the first ground potential. The second ground potential is selected for the electrical component 80 which is arranged in the component housing 300.

(25) If the battery system 100 according to the invention is used in a motor vehicle, the component housing 300 can be electrically connected to a body of the motor vehicle and the second ground potential is thus equal to a potential of the body. In this case, the battery housing 200 can be electrically connected to the negative terminal of the battery module 10 and the first ground potential is thus equal to the potential of the negative terminal. In this case, the battery housing 200 can also be connected to a floating potential. This means that the battery housing 200 is electrically insulated from all other electrically conductive parts of the motor vehicle.

(26) The invention is not limited to the exemplary embodiments described herein and the aspects highlighted therein. In fact, within the range specified by the claims, a plurality of variations are possible which are within the scope of action of the person skilled in the art.