DE102019207592A1 - Electric energy storage system and automobile - Google Patents

Abstract

The invention relates to an electrical energy storage system (1), comprising a plurality of electrical components (4) with data transmission devices (5) for the optical transmission of data signals from and / or to at least one of the electrical components (4), the data transmission devices (5) via at least one ring-shaped optical waveguide (8) are connected to one another, and at least one inlet device (9) designed as an optical waveguide for introducing optical data signals into the ring-shaped optical waveguide (8) for each of the data transmission devices (5) and at least one outlet device (10) designed as an optical waveguide for routing optical data signals from the ring-shaped optical waveguide (8) for each of the data transmission devices (5), the ring-shaped optical waveguide (8) having the at least one inlet device (9) and the at least one outlet device on each of the data transmission devices (5) direction (10) is connected. The invention also relates to a motor vehicle with at least one electrical energy storage system (1).

Description

The invention relates to an electrical energy storage system. The invention also relates to a motor vehicle.

Electrically powered vehicles, such as, for example, electrically powered electric vehicles or hybrid vehicles, have an electrical energy storage system. Such an energy storage system usually comprises a battery with a plurality of battery modules connected in series. The individual battery modules are each monitored and controlled by a battery module controller. The battery module controllers are connected to a battery management controller by means of data transmission devices and a transmission path.

From the DE 10 2009 058 879 A1 an electrical energy storage system of a vehicle is known, the energy storage system having a plurality of electrical components and data transmission devices for transmitting data signals between the electrical components. The data transmission devices comprise at least one transmission path for electromagnetic radiation in the form of an optical waveguide.

The invention is based on the object of creating an electrical energy storage system in which optical signal transmission between data transmission devices of electrical components is improved, in particular with a view to simpler assembly.

The object is achieved according to the invention by an electrical energy storage system with the features of claim 1. Advantageous embodiments of the invention emerge from the subclaims.

In particular, an electrical energy storage system is created, comprising a plurality of electrical components with data transmission devices for optical transmission of data signals from and / or to at least one of the electrical components, the data transmission devices being connected to one another via at least one ring-shaped optical waveguide, and at least one inlet device designed as an optical waveguide for introducing optical data signals into the ring-shaped optical waveguide for each of the data transmission devices and at least one outlet device designed as an optical waveguide for discharging optical data signals from the ring-shaped optical waveguide for each of the data transmission devices, wherein the ring-shaped optical waveguide is connected to each of the data transmission devices with the at least one inlet device and the at least a diversion device is connected.

The electrical energy storage system makes it possible to improve optical signal transmission between electrical components. It is provided that the optical transmission of data signals takes place via a ring-shaped optical waveguide. With this ring-shaped optical waveguide, inlet devices designed as optical waveguides for introducing optical data signals into the ring-shaped optical waveguide for each of the data transmission devices and outlet devices designed as optical waveguides for discharging optical data signals from the ring-shaped optical waveguide for each of the data transmission devices are connected. It is therefore possible at each of the data transmission devices to introduce optical data signals into the ring-shaped optical waveguide via the at least one inlet device and to extract light from the annular optical waveguide via the at least one outlet device separately from the at least one inlet device.

Due to the ring shape and the separately designed inlet and outlet devices, an optical transmission path can be constructed more simply. During the manufacture or assembly of the electrical energy storage system, individual optical waveguides no longer have to be laid between data transmission devices, in particular arranged via coupling interfaces. The ring-shaped optical waveguide can already be connected to all inlet and outlet devices when it is connected to light transmitters and light receivers of the data transmission devices. It can be provided, for example, that the ring-shaped optical waveguide, together with the already connected inlet and outlet devices, is mechanically plugged into the data transmission devices and locked in a position provided for this purpose, without a separate plugging process having to be carried out for each light transmitter and each light receiver. This speeds up assembly of the electrical energy storage system in a vehicle.

Another advantage is that galvanic isolation is provided between the individual data transmission devices.

An electrical energy storage system is, in particular, a battery which comprises a plurality of battery modules. Each of the battery modules includes battery cells in which the electrical energy is stored, in particular in electrochemical form. The battery modules also each include a battery module controller consisting of electrical components with a Data transmission device that monitors and controls the battery cells. Furthermore, the battery includes, in particular, a battery controller which consists of electrical components and which also has a data transmission device. The individual data transmission devices are connected to one another via the ring-shaped optical waveguide and the inlet and outlet devices. The battery controller controls the individual battery modules in particular by transmitting optical signals via the ring-shaped optical waveguide to the individual battery modules or to the respective battery module controller. The battery modules can, in particular, transmit status data and recorded sensor measurement values, etc. to the battery control.

The ring-shaped optical waveguide is, in particular, a ring-shaped medium that is suitable for the propagation and transmission of electromagnetic waves in the optical field. In particular, light guidance in the optical area takes place predominantly in the form of total reflection caused by a difference in the refractive index of the ring-shaped optical waveguide and a further medium, for example ambient air. The ring-shaped optical waveguide can in particular comprise a glass fiber, a plastic fiber or some other light guide element. The ring-shaped optical waveguide can in particular have a round or oval cross section. The term “ring-shaped” is not to be understood in the geometric sense here, but rather denotes the fact that the ring-shaped optical waveguide is self-contained, that is to say has no ends in relation to an intended direction of light propagation. However, a specific arrangement of the ring-shaped optical waveguide in the electrical energy storage system can deviate from a geometric ring shape.

An inlet device and an outlet device are designed in particular as optical waveguides. Here, too, light is guided predominantly according to the principle of total reflection due to a difference in the refractive indices of the inlet and outlet devices and a further medium, for example ambient air. These optical waveguides are connected to the ring-shaped optical waveguide. In particular, the inlet device and the outlet device can comprise a glass fiber, a plastic fiber or some other light guide element.

It can be provided that further optical elements are arranged between an inlet device and a light transmitter or an outlet device and a light receiver. Such an optical element can be a converging lens, for example.

The data transmission devices, the ring-shaped optical waveguide and the inlet and outlet devices can in particular be designed as part of a point-to-multipoint communication system in bus topology, in which a light transmitter brings in its information via the inlet device and several or all light receivers send it to the respective Can receive diversion devices directly. This means that information does not have to be sent from one sender to an addressee via several light transmitters / light receivers. This minimizes latency times and the necessary data traffic in the communication system. Compared to topologies in a ring structure ("daisy chain"), the data traffic is reduced by the factor ((m + 1) / 2) with M = number of end devices (e.g. for 1 battery control / battery management controller + 8 battery modules = 9 end devices, the data traffic is reduced by the factor 5). The bus structure also enables synchronization between the “end devices” or, in particular, between the battery modules. This can e.g. be necessary for a cross-module battery heating, in which the individual battery modules must switch on a respective heating current synchronously and out of phase with the other battery modules.

In one embodiment it is provided that data signals are introduced and diverted only in one direction of rotation of the ring-shaped optical waveguide. This makes it possible to achieve a high degree of efficiency in optical transmission. In particular, it is provided for this purpose that the introduction devices are oriented in such a way that light is introduced at least predominantly in one direction of rotation. Accordingly, it is provided in particular that the diverting devices are oriented in such a way that the light is diverted at least predominantly from one direction of rotation. This makes it possible to transmit optical data signals with a high degree of efficiency from one data transmission device to all other data transmission devices of the electrical energy storage system.

It can be provided that a light transmitter and a light receiver are provided for each inlet device and each outlet device. If an outlet or inlet device is defective, the transmission of optical data signals can be taken over by the remaining inlet or outlet device. This enables single-fault security to be achieved. In particular, an optical data signal can then be sent in the opposite direction of circulation to another data transmission device, which receives it and then initiates it in the direction of circulation.

In one embodiment it is provided that the at least one inlet device and / or the at least one diversion device has an oval cross-section at least at one connection point with the annular optical waveguide. As a result, a connection between the ring-shaped optical waveguide and the inlet and outlet devices can be made mechanically more stable, since a contact area is enlarged. A main axis of an ellipse formed by the oval cross section runs in particular parallel to a direction of rotation in the ring-shaped optical waveguide. In order to save installation space, the inlet and outlet devices can then be bent away from the annular optical waveguide in the direction of a minor axis of this ellipse, since a minimum bending radius in this direction is reduced compared to a bend along the main axis.

In one embodiment it is provided that a surface normal of an inlet surface of the at least one inlet device and / or a surface normal of an outlet surface of the at least one outlet device is each oriented at an angle of less than 90 ° to a direction of rotation within the annular optical waveguide. Since injected data signals or decoupled data signals no longer have to be deflected by 90 °, the coupling of optical data signals into the inlet device or the extraction of optical data signals from the outlet device can take place at a shorter distance from the ring-shaped optical waveguide. As a result, the installation space required for introducing and discharging can be reduced. An inlet surface here denotes the surface through which light from a light transmitter of a data transmission device is coupled into the inlet device. A diverting surface here denotes the area through which light is decoupled from the diverting device of a data transmission device and fed to a light receiver.

In a further developing embodiment it is provided that the angle is greater than or equal to 45 °. In this way, a compromise can be found between a reduced installation space for the inlet device and the outlet device and requirements for a structure of the data transmission devices, in particular an arrangement and orientation of light transmitters and light receivers.

In a further embodiment it is provided that the at least one inlet device on or in front of an inlet surface and / or the at least one outlet device on or in front of a outlet surface have at least one Fresnel lens. In this way it can be achieved that an angle at which optical data signals are introduced or discharged can be reduced with respect to the direction of rotation in the annular optical waveguide, so that the installation space required for introduction and discharge can be reduced.

In one embodiment it is provided that the ring-shaped optical waveguide is formed in one piece with the inlet devices and the outlet devices. This makes it possible to reduce the cost of producing the electrical energy storage system. In particular, it can be provided that the ring-shaped optical waveguide and the inlet and outlet devices are cast together in one piece by means of molding.

In one embodiment it is provided that the ring-shaped optical waveguide, the inlet devices and / or the outlet devices comprise a polymer. The polymer can be based, for example, on polymethyl methacrylate (PMMA or acrylic glass). This enables particularly simple production, for example by means of a molding process.

• Fällt beispielsweise ein Lichtempfänger einer Datenübertragungseinrichtung in einem Batteriemodul aus, so kann vorgesehen sein, dass eine Kommunikation über eine Spannungsregelung einer Batteriesteuerung erfolgt. Hierzu kann die Batteriesteuerung beispielswiese kurzzeitig eine Phase einer Motorwicklung kurzschließen. Ein hierdurch hervorgerufener Spannungseinbruch kann von einem Spannungssensor im Batteriemodul erfasst und ausgewertet werden. Zum Beispiel kann vorgesehen sein, dass Batteriemodule zyklisch ein „Alive“-Signal an die Batteriesteuerung senden müssen. Die Batteriesteuerung quittiert dann einen Empfang des „Alive“-Signals. Empfängt eine Datenübertragungseinrichtung aufgrund eines defekten Lichtempfängers keine solche Quittierung von der Batteriesteuerung, so wird von dem betroffenen Batteriemodul eine Information an die Batteriesteuerung versendet, dass eine unquittierte Information versendet wurde. Die Batteriesteuerung schließt nach Empfang dieser Information eine Phase einer Motorwicklung zweimal innerhalb einer bestimmten Zeit kurz. Der doppelte kurzzeitige Spannungseinbruch kann von einem Spannungssensor im Batteriemodul erfasst werden und wird als Quittierungszeichen gewertet. In diesem Notbetrieb kann daher weiterhin eine Kommunikation trotz des defekten Lichtempfängers erfolgen, sodass eine Einfehlersicherheit bereitgestellt werden kann.

In one embodiment, it is provided that inlet surfaces of the inlet devices and outlet surfaces of the outlet devices are each arranged on a light transmitter and a light receiver of the respective data transmission device in such a way that the light transmitter can also send data signals via the outlet surface into the ring-shaped optical waveguide and the light receiver can also send data signals via the inlet surface can receive from the ring-shaped optical waveguide. In this way, despite a simple, that is to say no double or redundant, design with only one light transmitter and one inlet device or one light receiver and one outlet device per data transmission device, one-fault security can be achieved. If, for example, a defect occurs in the inlet device, the light transmitter can also couple optical data signals into the ring-shaped optical waveguide via the outlet device. If a defect occurs in the discharge device, the light receiver can also receive optical data signals from the ring-shaped optical waveguide via the discharge device. Even if the efficiency is greatly reduced in this case, optical data signals can still be transmitted.
Furthermore, single-fault security can be implemented as follows:

• If, for example, a light receiver of a data transmission device in a battery module fails, it can be provided that communication takes place via voltage regulation of a battery controller. For this purpose, the battery control can, for example, briefly short-circuit a phase of a motor winding. A voltage drop caused by this can be detected by a voltage sensor in the Battery module can be recorded and evaluated. For example, it can be provided that battery modules have to send an “Alive” signal to the battery controller at regular intervals. The battery control then acknowledges receipt of the "Alive" signal. If a data transmission device does not receive such an acknowledgment from the battery control due to a defective light receiver, the battery module concerned sends information to the battery control that unacknowledged information has been sent. After receiving this information, the battery control short-circuits a phase of a motor winding twice within a certain time. The double short-term voltage drop can be detected by a voltage sensor in the battery module and is interpreted as an acknowledgment symbol. In this emergency operation, communication can therefore continue to take place despite the defective light receiver, so that single-fault security can be provided.

If, on the other hand, the light transmitter of a data transmission device in a battery module fails, a battery module can still generate data signals by briefly switching on a battery heater of the battery module and transmit them to a battery controller. For example, if the battery control sends information to a battery module with a defective light transmitter, the information sent cannot be acknowledged by the battery module after it has been received. Since the battery control has not received an acknowledgment after a certain time, the battery control sends information to the battery module that information has not been acknowledged. This information is received by the battery module with the defective light transmitter. The battery module can then, for example, short-circuit the battery heater twice within a certain time. A voltage drop caused by this can be detected by the battery control via a voltage measurement. The battery control recognizes via the measured two voltage drops that communication with the battery module is restricted, but that the (first) information has been received.

In one embodiment it is provided that the data transmission devices each have only a single light transmitter and a single light receiver. This saves components and thus costs. Nonetheless, single-fault security can be implemented by the measures described above.

In particular, a motor vehicle is also created, comprising at least one electrical energy storage system according to any of the described embodiments.

• 1 eine schematische Darstellung einer Ausführungsform des elektrischen Energ iespeichersystem s;
• 2 eine schematische Darstellung einer Ausführungsform des elektrischen Energiespeichersystems zur Verdeutlichung einer Anordnung des ringförmigen Lichtwellenleiters in einer perspektivischen Ansicht;
• 3 eine schematische Darstellung einer alternativen Ausführungsform des elektrischen Energiespeichersystems zur Verdeutlichung einer Anordnung des ringförmigen Lichtwellenleiters in einer perspektivischen Ansicht;
• 4 eine schematische Darstellung einer Ausführungsform des ringförmigen Lichtwellenleiters, der Einleiteinrichtungen und der Ausleiteinrichtungen in einer perspektivischen Ansicht;
• 5 eine schematische Darstellung einer weiteren Ausführungsform des ringförmigen Lichtwellenleiters, der Einleiteinrichtungen und der Ausleiteinrichtungen in einer Draufsicht;
• 6a eine schematische Darstellung einer Ausführungsform einer Einleiteinrichtung bzw. einer Ausleiteinrichtung;
• 6b eine schematische Darstellung einer weiteren Ausführungsform eines Teils einer Einleiteinrichtung bzw. einer Ausleiteinrichtung;
• 7 eine schematische Darstellung einer Einleiteinrichtung und einer Ausleiteinrichtung mit einem Lichtsender und einem Lichtempfänger.

The invention is explained in more detail below on the basis of preferred exemplary embodiments with reference to the figures. Here show:

• 1 a schematic representation of an embodiment of the electrical energy storage system;
• 2 a schematic representation of an embodiment of the electrical energy storage system to illustrate an arrangement of the annular optical waveguide in a perspective view;
• 3 a schematic representation of an alternative embodiment of the electrical energy storage system to illustrate an arrangement of the annular optical waveguide in a perspective view;
• 4th a schematic representation of an embodiment of the ring-shaped optical waveguide, the inlet devices and the outlet devices in a perspective view;
• 5 a schematic representation of a further embodiment of the annular optical waveguide, the inlet devices and the outlet devices in a plan view;
• 6a a schematic representation of an embodiment of an inlet device or a discharge device;
• 6b a schematic representation of a further embodiment of a part of an inlet device or a discharge device;
• 7th a schematic representation of an inlet device and an outlet device with a light transmitter and a light receiver.

In 1 Figure 3 is a schematic representation of one embodiment of an electrical energy storage system 1 shown. The electrical energy storage system 1 includes a battery controller 2 and several battery modules 3 .

The battery control 2 and the battery modules 3 each include electrical components 4th with data transmission facilities 5 . The electrical components 4th form battery module controllers for each of the battery modules, for example 3 out. The electrical components 4th the battery control 2 form a control or regulation of the electrical energy storage system 1 out.

The data transmission facilities 4th each include a light transmitter 6th and a light receiver 7th with which optical data signals, for example in the form of optical light pulses, between the electrical components 4th or the battery modules 3 and the battery control 2 can be transferred. The light transmitter 6th can be designed as LEDs or laser diodes, for example. The light receivers 7th can for example be designed as photodiodes.

The data transmission facilities 4th are via a ring-shaped optical fiber 8th connected with each other. This is done via discharge devices 9 and diversion devices 10 . The discharge devices are for this purpose 9 with the ring-shaped optical fiber 8th connected. The inlet devices are on inlet surfaces (not shown) 9 at the respective light transmitter 6th arranged. The diversion devices 10 are also with the ring-shaped optical fiber 8th connected. The discharge devices are on discharge surfaces (not shown) 9 at the respective light transmitter 6th arranged.

The introduction of optical data signals takes place in such a way that the optical data signals after introduction in one direction of rotation 11 in the annular optical waveguide 8th circulate. The circulating optical data signals can then be routed out several times and in this way all electrical components 4th or all battery modules 3 and the battery control 2 are fed.

In 2 Figure 3 is a schematic representation of one embodiment of the electrical energy storage system 1 to illustrate an arrangement of the ring-shaped optical waveguide 8th shown in a perspective view. The illustration shows three battery modules 3 , which are arranged side by side to form a battery. The ring-shaped optical fiber 8th is at a top 12 of the battery modules 3 arranged and has no geometric ring shape but consists of an elongated section 13 in which the ring-shaped optical fiber 8th runs parallel to each other at a small distance and has two loop sections 14th at both ends of the battery. The optical data signals are introduced and discharged only on one strand of the two parallel strands in the elongated section 13 of the ring-shaped optical waveguide 8th . The advantage of this embodiment is that assembly of the ring-shaped optical waveguide 8th , the discharge devices 9 and the diversion devices 10 is locally concentrated so that it can be carried out more efficiently. For example, it can be provided that for each of the battery modules 3 one plug connection each for mechanical locking of the ring-shaped optical waveguide 8th , the discharge devices 9 and the diversion devices 10 on the respective battery module 3 must be trained.

In 3 Figure 3 is a schematic representation of an alternative embodiment of the electrical energy storage system 1 to illustrate an arrangement of the ring-shaped optical waveguide 8th shown in a perspective view. The embodiment corresponds essentially to that in FIG 2 embodiment shown. The difference, however, is that there is a spacing between parallel strands of the annular optical waveguide 8th in the elongated section 13 is bigger.

In 4th Figure 3 is a schematic representation of an embodiment of the annular optical waveguide 8th , the discharge devices 9 and the diversion devices 10 shown in a perspective view. The discharge devices 9 and the diversion devices 10 are each on a bottom 15th with the ring-shaped optical fiber 8th connected.

It is provided in this embodiment that surface normals 16 of discharge surfaces 17th the discharge devices 9 and surface normals 18th of rejection surfaces 19th the diversion devices 10 each at an angle of 45 ° to a direction of rotation 11 inside the ring-shaped optical fiber 8th are oriented (only for one discharge device 9 and a diverter 10 shown). This means that optical data signals are at an angle of 45 ° to the ring-shaped optical waveguide 8th or to the direction of rotation 11 into the ring-shaped optical fiber 8th can be coupled in and at an angle of 45 ° from the annular optical waveguide 8th can be decoupled again. As a result, a smaller installation space can be realized with an arrangement of the annular optical waveguide 8th and the associated discharge devices 9 and diversion devices 10 on light transmitters and light receivers of the data transmission equipment.

The ring-shaped optical fiber 8th is integral with the discharge devices 9 and the diversion devices 10 educated. The ring-shaped optical fiber 8th , the discharge devices 9 and the diversion devices 10 can for example be produced inexpensively from PMMA in a molding process.

In 5 Figure 3 is a schematic representation of another embodiment of the annular optical waveguide 8th , the discharge devices 9 and the diversion devices 10 shown in a top view. The ring-shaped optical fiber 8th has a round cross-section. The discharge devices 9 and the diversion devices 10 also point at least at inlet surfaces 17th and discharge surfaces have round cross-sections. At connection points 20th show the discharge devices 9 or the diversion devices 10 each have an oval cross-section, with a main axis 21st one through the oval cross-section formed ellipse parallel to the ring-shaped optical waveguide 8th or to the direction of rotation 11 runs. This enables a mechanical stability of the connection between the ring-shaped optical waveguide 8th and the inlet device 9 or the diversion device 10 be increased and at the same time a bending radius of the discharge devices 9 or the diversion devices 10 in a direction perpendicular to the annular optical waveguide 8th or perpendicular to the direction of rotation 11 be kept small. As a result, the installation space required for introducing and discharging can be reduced, since the ring-shaped optical waveguide 8th , the discharge devices 9 and the diversion devices 10 can be arranged at a smaller distance on light transmitters and light receivers of the data transmission devices.

In 6a Figure 3 is a schematic representation of an embodiment of an inlet device 9 or a diversion device 10 shown. The discharge device 9 or the diversion device 10 largely corresponds to that in 5 embodiment shown.

At a discharge surface 17th or on a discharge surface 19th have the discharge device 9 or the diversion device 10 a Fresnel lens 22nd on. Depending on a facet orientation of facets 26th directs the Fresnel lens 22nd incident light 23 by an angle α, so that an installation height required for introduction and discharge can be reduced by the factor cos (a).

In 6b Figure 3 is a schematic representation of part of a further embodiment of an inlet device 9 or a diversion device 10 shown. The discharge device 9 or the diversion device 10 in this embodiment additionally comprise a Fresnel lens 22nd which as a disc 27 is formed and which in front of a discharge surface 17th or a discharge surface 19th are arranged, both on an upper side 24 as well as on a bottom 25th angled facets 26th are trained. The Fresnel lens guides depending on a facet orientation 22nd the beam in two partial steps by an angle a1 and α2 so that a total of α = α1 + α2 is deflected. This also makes it possible to reduce the installation space required for introducing and discharging.

Alternatively, it can also be provided that on the disk 27 only on one side 24 , 25th Facets 26th a Fresnel lens 22nd are trained.

In 7th is a schematic representation of an inlet device 9 and a diversion device 10 in an arrangement with a light transmitter 6th and a light receiver 7th shown to illustrate a further embodiment of the electrical energy storage system.

An introductory surface 17th and a discharge surface 19th are so above the light transmitter 6th and the light receiver 7th arranged that the light transmitter 6th via a club-shaped radiation characteristic 28 Data signals also via the rejection surface 19th into the ring-shaped optical fiber 8th can initiate and the light receiver 7th Data signals also via the introduction surface 17th from the ring-shaped optical fiber 8th can receive. The light transmitter is for this purpose 6th and the light receiver 7th at a distance 29 , which is a few millimeters, for example, to the inlet surface 17th or the discharge surface 19th arranged.

This allows despite a simple design with only one light transmitter 6th and an inlet device 9 or a light receiver and a diversion device 10 A single-fault security can be achieved per data transmission device. On a double version of light transmitters 6th and light receivers 7th can therefore be omitted.

List of reference symbols

1

electrical energy storage system

2

Battery control

3

Battery module

4th

electrical component

5

Data transmission device

6

Light transmitter

7th

Light receiver

8th

ring-shaped optical fiber

9

Discharge device

10

Diversion device

11

Direction of rotation

12

Top

13

section

14th

Loop section

15th

bottom

16

Surface normals

17th

Discharge surface

18th

Surface normals

19th

Rejection surface

20th

Connection point

21st

Main axis

22nd

Fresnel lens

23

incident light

24

Top (Fresnel lens)

25th

Underside (Fresnel lens)

26th

facet

27

disc

28

Radiation characteristic

29

distance

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102009058879 A1 [0003]

Claims (10)

An electrical energy storage system (1) comprising: a plurality of electrical components (4) with data transmission devices (5) for the optical transmission of data signals from and / or to at least one of the electrical components (4), wherein the data transmission devices (5) are connected to one another via at least one ring-shaped optical waveguide (8), and at least one feed device (9) designed as an optical waveguide for feeding optical data signals into the ring-shaped optical waveguide (8) for each of the data transmission devices (5) and at least one output device (10) designed as an optical waveguide for feeding out optical data signals from the annular optical waveguide (8) for each of the data transmission devices (5), wherein the ring-shaped optical waveguide (8) on each of the data transmission devices (5) is connected to the at least one inlet device (9) and the at least one outlet device (10). Electrical energy storage system (1) according to Claim 1 , characterized in that data signals are introduced and diverted only in one direction of rotation (11) of the annular optical waveguide (8). Electrical energy storage system (1) according to Claim 1 or 2 , characterized in that the at least one inlet device (9) and / or the at least one outlet device (10) have an oval cross-section at least at one connection point (20) with the annular optical waveguide (8). Electrical energy storage system (1) according to one of the preceding claims, characterized in that a surface normal (16) of an inlet surface (17) of the at least one inlet device (9) and / or a surface normal (18) of a outlet surface (19) of the at least one outlet device ( 10) is oriented at an angle of less than 90 ° to a direction of rotation (11) within the annular optical waveguide (8). Electrical energy storage system (1) according to one of the preceding claims, characterized in that the at least one inlet device (9) on or in front of an inlet surface (17) and / or the at least one outlet device (10) on or in front of a outlet surface (19) at least one Have Fresnel lens (22). Electrical energy storage system (1) according to one of the preceding claims, characterized in that the ring-shaped optical waveguide (8) is designed in one piece with the inlet devices (9) and the outlet devices (10). Electrical energy storage system (1) according to one of the preceding claims, characterized in that the ring-shaped optical waveguide (8), the inlet devices (9) and / or the outlet devices (10) comprise a polymer. Electrical energy storage system (1) according to one of the preceding claims, characterized in that inlet surfaces (17) of the inlet devices (9) and outlet surfaces (19) of the outlet devices (10) each in such a way on a light transmitter (6) and a light receiver (7) of the respective Data transmission device (5) are arranged so that the light transmitter (5) can also send data signals via the lead-out surface (19) into the ring-shaped optical waveguide (8) and the light receiver (7) can also send data signals via the lead-in surface (17) from the ring-shaped optical waveguide (8) ) can receive. Electrical energy storage system (1) according to one of the preceding claims, characterized in that the data transmission devices (5) each have only a single light transmitter (6) and a single light receiver (7). Motor vehicle, comprising at least one electrical energy storage system (1) according to any one of Claims 1 to 9 .

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