Connection module for an electrical energy storage system and energy supply system

Abstract

Connection module (3) for electrical coupling between an electrical energy storage device (2), in particular a traction battery (2), and a traction network (4) of a motor vehicle, comprising: - a first connecting element (31) for connecting to the electrical energy storage device (2) and a second connecting element (32) for connecting to the traction network (4); - several busbars (33, 34) connecting the first and the second connecting element (31, 32) to each other; - a primary current measuring element (35); - a non-contact operating secondary current measuring element (52) designed as a magnetic field-sensitive current sensor, in particular as an AMR or GMR sensor, wherein the secondary current measuring element (52) is arranged between two parallel contacts of the first connecting element (31) in order to detect a measuring magnetic field formed when current flows through two busbars (33, 34).

Description

Technical field

[0001] The invention relates to electrical energy storage devices for energy supply systems in motor vehicles, in particular measures for redundant current measurement in such an energy supply system. Technical background

[0002] Due to legal requirements, the functionality of sensors and actuators in motor vehicles must be continuously monitored. In particular, current measurement in a traction network is monitored using a redundant current measurement system. While primary current measurement is typically performed using shunts, Hall effect sensors or shunts can be used as secondary current sensors. However, Hall effect sensors have the disadvantage of being relatively inaccurate, which makes diagnosing malfunctions more difficult. Using a shunt as a secondary current meter, on the other hand, is relatively expensive, as each shunt requires its own analog-to-digital converter for synchronous current measurement.

[0003] Another option for secondary current measurement is to use an AMR sensor (AMR: Anisotropic Magnetoresistance). However, AMR-based current measurement methods always require a U-shaped busbar to create a sufficient magnetic field through the current flow to ensure the necessary measurement accuracy and to eliminate interference fields. The U-shape of the busbar must be provided separately, so the AMR sensor is typically connected to the battery system's busbars via a screw connection, or a busbar of this shape is required.

[0004] Typically, a shunt is used for primary current measurement, connected to the battery unit via screw connections. Secondary current measurement is currently arranged separately, resulting in additional installation effort in addition to the specially designed busbar.

[0005] It is therefore an object of the present invention to provide an improved battery connection module that is simpler in design and allows redundant current measurement. Disclosure of the invention

[0006] This problem is solved by the connection module for an electrical energy storage device of an energy supply system of a motor vehicle according to claim 1 and by the energy supply system according to the dependent claim.

[0007] Further details are specified in the dependent claims.

[0008] According to a first aspect, a connection module for an electrical energy storage device of a motor vehicle, in particular a traction battery, is provided, comprising: - a first and a second connecting element for connecting to the electrical energy storage system and to a traction network; - several busbars connecting the first and second connecting elements; - a primary current measuring element; - a non-contact secondary current measuring element.

[0009] Furthermore, the secondary current measuring element can be designed as a magnetic field-sensitive current sensor, in particular as an AMR or GMR sensor.

[0010] The connection module described above serves for the electrical coupling between an electrical energy storage device and the traction network of a motor vehicle. One feature of this module is its integration of secondary current measurement. This is achieved by equipping the terminals connecting the traction battery to the module with a non-contact secondary current measuring element, such as an AMR sensor. This eliminates the need for an additional U-shaped busbar, typically used to mount a current sensor operating on an AMR measurement. Simultaneously, existing busbars within the connection module can be utilized for battery current measurement via the non-contact secondary current sensing device.

[0011] By providing non-contact secondary current measurement within the battery connection module, the non-contact current sensor can be separated from the rest of the traction network.

[0012] Furthermore, the primary current measuring element can be designed with a measuring resistor, in particular with a shunt.

[0013] According to one embodiment, the battery connection module is provided as a separate unit enclosed by a housing.

[0014] The connection module may also include one or more of the following components, which are connected to one or more of the busbars: - an overcurrent protection device; - a switching unit for disconnecting or closing a current flow through the busbars between the first and second connecting element; and - a pre-charging circuit.

[0015] Alternatively, the pre-charging circuit can also be implemented using a semiconductor with appropriate control together with a separating element.

[0016] Furthermore, the secondary current measuring element can be arranged at contacts of the first connecting element.

[0017] It may be possible to arrange the secondary current measuring element between two parallel contacts of the first connecting element in order to detect a measuring magnetic field formed when current flows.

[0018] According to another aspect, an energy supply system for a motor vehicle is provided, which includes an electrical energy storage device and the above connection module, which is designed to electrically connect the electrical energy storage device to a traction network. List of characters

[0019] The embodiments are explained in more detail below with reference to the accompanying drawings. These show: Fig. 1. A schematic representation of a battery system comprising a traction battery and a battery connection module; and Fig. 2 A top view of an example of a battery connection module with a positioned AMR sensor. Description of embodiments

[0020] Fig. Figure 1 shows a schematic representation of an energy supply system 1 in the form of a battery system with an electrical energy storage device, in particular a traction battery 2. The traction battery 2 It can be composed of a number of battery cells connected in series and / or parallel. The traction battery 2 features an electrical battery connection element 21 in the form of a contact connection, which can be designed as a screw or plug connection, in order to connect it to a battery connection module 3 (Connection module) to connect. The battery connection module3 This includes a first electrical connecting element. 31 with contacts 31a , 31b up, which leads to the battery connection element 21 the traction battery 2 corresponding, so that an electrical connection between the traction battery 2 and the battery connection module 3 can be manufactured.

[0021] Furthermore, the battery connection module 3 a second connecting element 32 with contacts 32a , 32b up to access the battery connection module 3 electrically with a traction network 4 to connect them. The traction network is used for this purpose. 4 with a suitable traction network connection element 41 provided. The connecting elements 21 , 31 , 32 , 41 can be designed as detachable plug connections.

[0022] The battery connection module 3includes a first and a second busbar 33 , 34 The busbars essentially connect (electrically) the contacts. 31a , 31b of the first connecting element 31 with the contacts 32a , 32b of the second connecting element 32 via corresponding busbars 33 , 34 One of the busbars 33 , 34 , in the present embodiment the first busbar 33 , is equipped with a primary current measuring element 35 equipped to allow current to flow through the first busbar 33 to measure. The primary current measuring element 35 It can, for example, be designed as a shunt (measuring resistor). The current is measured by tapping and evaluating the voltage across the shunt.

[0023] Furthermore, an overcurrent protection device can 36 in one of the power rails 33 , 34It must be designed to ensure overcurrent protection. This can be in the form of a fuse or a reusable overcurrent fuse, for example.

[0024] Furthermore, the battery connection module 3 a switching unit 37 on, such as two contactors 38 and 40 as switching elements (alternatively these can be implemented using semiconductors), with which both busbars 33 , 34 to be switched. One of the busbars points in parallel to the switching element. 38 a pre-charging circuit 39 on, which have a pre-charge resistor connected in series 50 and a pre-charging relay 51 features the pre-charging circuit 39 It serves to prevent electrical coupling of the traction battery. 2 to the traction network 4 to dampen the increase in current flow by first switching off the pre-charge relay 51 and the protector 38be switched on and after a certain time delay, especially if a pre-loading condition is met, the contactor 40 is switched on, so that the abrupt current changes via the busbars 33 , 34 can be limited.

[0025] The battery connection module 3 is further equipped with a secondary current measuring element 52 The secondary current measuring element is provided, preferably as a non-contact current sensor, in particular as an AMR measuring element. 52 It must be positioned so that it lies at a defined distance from the supply and return conductors to the battery. This ensures the secondary current measuring element... 52 exposed to a magnetic field generated by the current flowing through both busbars 33 , 34 is generated. The arrangement of the secondary current measuring element 52 along the power rails 33 , 34is essentially arbitrary.

[0026] In Fig. Figure 2 is a cross-sectional view through a conventional battery connection module. 3 shown. You can see the contacts. 31a , 31b of the first connecting element 31 to connect the first and second busbars 33 , 34 Between the first and second busbars 33, 34 immediately after the first connecting element 31 is the positioning of a secondary current measuring element 52 The battery connection module is indicated by a corresponding rectangle, 55. 3 is provided in a housing 45, which accommodates all of the components described above.

[0027] Alternatively, the secondary current measuring element can be used 52 at the contacts 31a , 31b of the first connecting element. In particular, two adjacent contacts can be arranged. 31a , 31b of the first connecting element31 The secondary current measuring element can be used. 52 to be positioned between them to achieve a sufficient strength of a measuring magnetic field generated when current flows. This eliminates the need for a U-shaped section of a busbar, which is otherwise required to generate the measuring magnetic field, thus reducing manufacturing costs. It is essential that currents flow through both busbars. 33 , 34 through the current measuring element 52 can be recorded. Reference symbol list 1 battery system 2 traction batteries 21 Battery connection element 3 Battery connection module 31 first connecting element 31a, 31b Contacts 32 second connecting element 32a, 32b Contacts 33 first busbar 34 second busbar 35 primary current measuring element 36 Overcurrent protection 37 Switching unit 38 Schütz 39 Pre-charging circuit 40 Schütz 50 pre-charge resistor 51 Pre-charge relays 52 secondary current measuring element 4 Traction network 41 Traction network connection element

Claims

[1] Connection module (1) for an electrical energy storage device (2) of a motor vehicle, in particular a traction battery, comprising: - a first and a second connecting element (31, 32) for connecting to the electrical energy storage (2) and to a traction network (4); - several busbars (33, 34) connecting the first and second connecting element (31, 32) together; - a primary current measuring element (35); - a non-contact secondary current measuring element (52). [2] Connection module (1) according to claim 1, wherein the primary current measuring element (35) is configured with a measuring resistor, in particular with a shunt. [3] Connection module (1) according to claim 1 or 2, which is enclosed by a housing (45). [4] Connection module (1) according to one of claims 1 to 3, wherein one or more of the following components are further connected to one or more of the busbars (33, 34): - an overcurrent protection (36); - Switching elements (38, 40) for disconnecting or closing a current flow through the busbars (33, 34) between the first and second connecting element (31, 32); and - a pre-charging circuit (39). [5] Connection module (1) according to one of claims 1 to 4, wherein the secondary current measuring element (52) is designed as a magnetic field sensitive current sensor, in particular as an AMR or GMR sensor. [6] Connection module (1) according to claim 5, wherein the secondary current measuring element (52) is arranged on contacts of the first connecting element (31). [7] Connection module (1) according to claim 6, wherein the secondary current measuring element (52) is arranged between two parallel contacts of the first connecting element (31) to detect a measuring magnetic field formed when current flows. [8] Connection module (1) according to claim 6, wherein the secondary current measuring element (52) is arranged on two parallel connecting elements to detect a measuring magnetic field formed when current flows. [9] Energy supply system for a motor vehicle comprising: - an electrical energy storage device (2); and - a connection module (1) according to one of claims 1 to 8, which is configured to electrically connect the electrical energy storage device (2) to a traction network (4).

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