CN110993843A

CN110993843A - Contact and connection of battery module

Info

Publication number: CN110993843A
Application number: CN201910937721.8A
Authority: CN
Inventors: L.拉肯马歇尔; A.莱姆克; B.沙尔; F.韦舍; M.克林克; B.格勒格; H.福尔克马尔
Original assignee: Volkswagen AG
Current assignee: Volkswagen AG
Priority date: 2018-10-02
Filing date: 2019-09-30
Publication date: 2020-04-10
Anticipated expiration: 2039-09-30
Also published as: DE102018124364A1; KR20200038191A; CN110993843B; KR102281070B1

Abstract

The contacts of the battery module are closed and wired. A module carrier unit (2) for contacting a battery module (18) comprises: an electrically conductive carrier plate (4) for accommodating the battery module (18); and a plurality of connection terminals (6) for contacting poles (12, 14) of the battery module (18), wherein the connection terminals (6) are arranged on the carrier plate (4) such that the length of a connection path for electrically connecting a pole (12, 14) of the battery module (18) with a pole (12, 14) of a further battery module (18) can be minimized independently of the layout of the poles (12, 14) of the battery module (18) to be connected.

Description

Contact and connection of battery module

Technical Field

The invention relates to a module carrier unit, a system and a method for contacting and connecting battery modules.

Background

The publication DE 102014204245 a1 relates to a battery module having a plurality of galvanic cells, in particular battery cells, each having a first outer side comprising a first electrode and a second outer side comprising a second electrode, wherein the cells are electrically connected to one another by being connected to one another via the electrodes at the outer sides, respectively.

The publication DE 102014217119 a1 relates to a battery carrier for accommodating a plurality of battery cells, which has a plurality of recesses which are formed in a planar body at a distance from one another and are formed for accommodating in each case one battery cell. The battery cells, which can be accommodated in the cell carrier and are insulated from one another, can also be connected to one another by means of a connecting element, which comprises a first and a second contact element.

A disadvantage of the prior art mentioned is the cost of contacting and connecting the battery modules with battery poles which are each not arranged identically. In particular, differently positioned poles occur when battery modules of different manufacturers or different battery types are used. In this case, high contact and wiring costs are achieved because long connecting elements must be used for the desired connection of the poles. The use of such a connecting element is disadvantageous for several reasons. On the one hand, the wiring or contacting process when using long connecting elements is much more expensive and requires more connecting material, so that disadvantages not only with respect to material and manufacturing costs are obtained, but also with respect to the weight of the battery module. Furthermore, long connecting elements are often a critical point in particular with regard to wire disconnection and wire resistance, which has an adverse effect on efficient and robust contacting and wiring.

Disclosure of Invention

The object of the present invention is therefore to eliminate the disadvantages described above at least in part, and in particular to provide a device, a system and a method for contacting and connecting battery modules, which make it possible to achieve an extremely robust and energy-efficient electrical connection of different battery modules in a manner that is as simple and cost-effective as possible.

The above object is achieved by a device having the features of claim 1, a system according to claim 6 and a method according to claim 10. Further features and details emerge from the dependent claims, the description and the drawings. The technical features disclosed in connection with the device according to the invention are also applicable here in connection with the system according to the invention and the method according to the invention and vice versa, so that the disclosure in connection with the various inventive aspects is always mutually referred to. Suitable embodiments of the invention are explained in the dependent claims.

The module carrier unit according to the invention for contacting a battery module comprises: an electrically conductive carrier plate for receiving a battery module; and a plurality of connection terminals for contacting poles of the battery module. In this case, according to the invention, the connection ends are arranged on the carrier plate such that the length of the connection path for electrically connecting a pole of a battery module to a pole of another battery module can be minimized independently of the arrangement of the poles of the battery modules to be connected.

Contact is understood within the scope of the invention to mean the establishment of an electrical contact.

Within the scope of the present invention, the electrical conductivity is understood to be at least greater than 5 ∙ 10 under standard conditions^-6S/cm, especially at least more than 10⁴Conductivity of S/cm.

It is also easy to understand that: the module carrier unit according to the invention is suitable for contacting a battery module, also for contacting a capacitor or a fuel cell, or the like.

The module carrier unit according to the invention for contacting a battery module can preferably be used in a motor vehicle, in particular in an electric or hybrid vehicle, and is preferably arranged there within a drive, in particular in the region of a battery pack. The module carrier unit according to the invention can also be used in all modularly constructed energy stores (static cell energy stores for solar installations, battery systems in ships, aircraft, engineering machines).

In particular, the minimization according to the invention of the length of the connection path for electrically connecting the poles of the first battery module with the poles of the second battery module can be achieved in particular by establishing an indirect electrical connection between the first pole of the first battery module and the second pole of the second battery module via the carrier plate. This is then achieved, for example, by: the carrier plate is electrically connected to one pole of the first battery module and one pole of the second battery module and the carrier plate and the respective pole thus have the same potential.

In particular, it has been seen that: by the connection of the poles of the two battery modules via the carrier plate, there is a much higher flexibility with regard to the use of battery modules of different manufacturers and battery types, since, by means of the connection via the carrier plate, there is always a short connection path regardless of the arrangement of the poles of the battery modules to be connected and therefore simultaneously robust, energy-efficient and cost-effective connection of the battery modules.

In order to ensure a particularly flexible layout and contacting or wiring of the battery module in this case, provision can be made according to the invention for: the carrier plate has an electrically conductive core and an insulating layer arranged around the core. In this case, the electrically conductive core is preferably at least partially composed of an aluminum material, in particular at least partially composed of a copper material. The corresponding design not only indicates good electrical conductivity, but also good thermal conductivity, which is advantageous, in particular, with regard to efficient heat dissipation. The insulating layer arranged around the electrically conductive core is formed in the form of an electrically non-conductive connection, preferably in the form of plastic, ceramic or the like. In this case, the insulating layer can also be applied to the conductive core of the carrier plate according to the invention, for example in the form of a lacquer, film or paint.

In particular, in order to ensure short connection paths for the connections of the individual modules of the battery cells and at the same time provide as great flexibility as possible for the layout of the battery modules, provision may also be made for: the connection end according to the invention is arranged within an edge region of the carrier plate. In this case, the edge region is preferably arranged at an outer region of the carrier plate and is preferably formed in the form of a frame or the like. In this case, the size of the edge region can advantageously be determined and/or varied with respect to the size of the battery module that can be arranged on the carrier plate. Alternatively or cumulatively to the arrangement of the connection ends in the edge region of the carrier plate, a combination of connection ends outside the edge region and/or inside and/or below the particular carrier plate is also conceivable.

According to the invention, with regard to the most flexible possible layout of the poles of the battery module or the most flexible possible use of battery modules of different manufacturers and module types, provision can be made in particular for: these connection ends are arranged at least partially on mutually opposite sides of the carrier plate. In the case of a rectangular shape of the particular carrier plate, it can be particularly advantageous with regard to the most flexible possible wiring: the carrier plate has at least four connecting ends which are arranged at least partially on mutually opposite sides of the carrier plate. In this case, in particular, the connection terminals are arranged on the carrier plate such that two connection terminals lying opposite one another are electrically connected to the same pole of the battery module. It is also conceivable that: the connection terminals for making electrical connections can also be arranged below the carrier plate, so that electrical connections for connecting adjacent carrier plates, for example, proceeding from the carrier plate, can also be guided via the underside of the plate.

With regard to simple insertion and removal or replacement of the battery module, these connection ends can advantageously be designed such that a releasable electrical connection can be established between the battery poles and the connection ends. In this case, the particular connecting end arranged on the carrier plate is likewise at least partially made of a copper material, at least partially made of an aluminum material or at least partially made of a ferrous material and is preferably connected to the carrier plate in a form-fitting, force-fitting or material-fitting manner. In the embodiment of the carrier plate surrounded by the insulating layer, the connection terminals are electrically connected to the electrically conductive core and are preferably connected to the electrically conductive core in a form-fitting, force-fitting or material-fitting manner. In this way, a form-fitting, force-fitting or material-fitting electrical connection can likewise be established between the carrier plate and the poles of the battery module via these connection ends. In this case, the electrical connection can be formed in a releasable manner, for example in the form of a plug connection or a screw connection, but also in a non-releasable manner, for example in the form of a soldered connection, a welded connection or a press connection. In addition, within the scope of flexible contacting, it is advantageously also possible for different contacting methods to be present in parallel.

The subject of the invention is also a system for the wiring of battery modules. Here, the specific system includes: a base unit for accommodating the module carrier unit described above; a plurality of the above-described modular carrier units; and a plurality of battery modules arranged on the module carrier unit. Thereby, the system according to the invention brings the same advantages as have been described in detail in connection with the modular carrier unit according to the invention.

Advantageously, the particular base unit for receiving the module carrier unit can be formed in the form of a battery pack base or the like and can be embodied both electrically conductive and electrically non-conductive or insulating. The particular carrier plate is preferably arranged in a sandwich-like manner with respect to the construction of the particular system between the base unit and the battery module, wherein the carrier plate and the base unit and/or the battery module are preferably arranged at least substantially parallel to one another at least along a surface, wherein in particular the carrier plate and the flat sides of the base unit and/or the battery module are arranged substantially parallel to one another. Alternatively or cumulatively to the battery modules arranged within the particular system, there can also be capacitors or fuel cells or solar cells or the like arranged on the module carrier unit and wired to each other and/or to the battery module according to the invention.

In the context of the electrically conductive base unit, according to the invention, provision can be made, in particular, for simple and flexible connection of the individual battery modules: the base unit has an electrically insulating recess for receiving the module carrier unit. Such an embodiment allows, in particular, an electrically conductive and non-insulating design of the particular base unit, which enables improved heat dissipation.

With regard to the most compact possible layout of the particular system, these recesses can preferably be formed in the form of recesses for accommodating the module carrier units surface-flush. This compact arrangement is advantageous in particular with regard to a space-saving embodiment of the system according to the invention. In this case, the recesses can also preferably be drilled deeper and ensure a flush accommodation of the surface of the battery module arranged on the module carrier unit. According to the invention, alternatively or cumulatively thereto, provision may be made for: the particular system is enclosed in or integrated into the housing.

In order to ensure an efficient and effective dissipation of the heat losses occurring within the battery module, the particular base unit may advantageously also have coolant channels for the cooling of the module carrier plate. In this case, the coolant channel is preferably arranged immediately adjacent to the module carrier plate. In the context of an arrangement immediately adjacent to the module carrier plate, the coolant channel is then either electrically insulated from the module carrier unit or operated by means of an electrically non-conductive, but thermally well-conducting coolant, such as thermally conducting oil or the like. With regard to efficient cooling, the coolant channels may also preferably have flow-guiding means for guiding the flow in order to dissipate the heat generated during the current transmission as uniformly as possible from the battery module or the particular system.

Furthermore, the subject matter of the invention is also a battery pack comprising a module carrier unit as described above, in particular comprising a system as described above.

The invention also relates to a method for contacting a battery module. In this case, a specific method for contacting a battery module comprises the following steps: establishing a first electrical connection between a first pole of a first battery module and the module carrier unit; and establishing a second electrical connection between the second pole of the first battery module and the first pole of the second battery module. The method according to the invention further comprises the following steps: a third electrical connection is established between the first pole of the first battery module and the second pole of the second battery module via the at least one module carrier unit in order to minimize the length of the connection path of the electrical connection between the first pole of the first battery module and the second pole of the second battery module independently of the layout of the poles of the battery modules to be connected. The method according to the invention thereby brings about the same advantages as have already been described in detail in connection with the module carrier unit according to the invention and the system according to the invention.

In this case, the second step of the method according to the invention, i.e. the establishment of the second electrical connection, can also be established by means of a carrier plate arranged below the second battery module. In the case of contact-making or wiring of the battery modules, these battery modules can be connected not only in series with one another but also in parallel with one another, so that the first pole of the battery module can be both the negative pole of the battery module and the positive pole of the battery module. By establishing the first and third electrical connections according to the invention, the carrier plate has in particular the potential of one of the poles of the first battery module. Alternatively or cumulatively, the method according to the invention can also produce a single type or a conceivable combination of single types of contacting or electrical connection between the battery modules, capacitors, fuel cells, solar cells or the like.

Drawings

Further advantages, features and details of the invention emerge from the following description, in which embodiments of the invention are described in detail with reference to the drawings. The features mentioned in the claims and in the description may each be present individually or in any combination to reflect the inventive essence.

Wherein:

fig. 1a shows a schematic diagram of a contact-making module carrier unit according to a first exemplary embodiment of the invention for a battery module in a plan view;

fig. 1b shows a schematic view of a modular carrier unit according to fig. 1a according to the invention in a sectional view along sectional line I-I;

fig. 2a shows a schematic diagram of a contact-making module carrier unit according to a second exemplary embodiment of the invention for a battery module in a plan view;

fig. 2b shows a schematic diagram of a contact-making module carrier unit according to a third exemplary embodiment of the invention for a battery module in a top view;

fig. 3a shows a schematic illustration of the arrangement of a battery module according to a first embodiment on a module carrier unit according to the invention for contacting the battery module;

fig. 3b shows a schematic illustration of the layout of a battery module according to a second embodiment on a module carrier unit according to the invention for contact-making of the battery module;

fig. 4a shows a schematic illustration of the layout of a battery module according to a third embodiment on a module carrier unit according to the invention for contact-making of the battery module;

fig. 4b shows the battery module according to fig. 4a in a view rotated 180 ° along the longitudinal axis of the battery module;

fig. 5 shows a schematic view of a system for the wiring of a battery module according to the invention in a top view;

fig. 6 shows a schematic view of a partial section of a system according to a second embodiment of the invention according to fig. 5, which system comprises a cooling channel 24 for efficient heat dissipation.

In the figures, the same reference numerals are used for the same technical features.

Detailed Description

Fig. 1a shows a schematic representation of a contact-making module carrier unit 2 according to a first exemplary embodiment of the invention for a battery module 18 in a plan view. In this case, the module carrier unit 2 comprises an electrically conductive carrier plate 4 having an inner region 4b and an edge region 4 a. In the edge region 4a, which extends in the present case in a frame-like manner around the inner region 4b, two connection terminals 6 are arranged in the present case opposite one another in each case for contacting the

poles

12, 14 of the battery pack 18. The connection end 6 can be formed in the form of a plug connection, a screw connection, a press connection, a welded connection, a soldered connection or the like, and can realize a form-fitting, force-fitting or material-fitting connection of the carrier plate 4 or the module carrier unit 2 to the

poles

12, 14 of the battery module 18. Alternatively or cumulatively to the arrangement of the connection ends 6 in the edge region 4a of the carrier plate 4, combinations of connection ends 6 outside the edge region 4a and/or inside the particular carrier plate 4 are also conceivable.

Fig. 1b shows a schematic representation of a modular carrier unit 2 according to the invention according to fig. 1a in a sectional view along the sectional line I-I. The electrically conductive core 10, which is arranged inside in the present case, can in particular be formed at least partially from a copper material, at least partially from an aluminum material or at least partially from a ferrous material, and in this case is electrically conductively connected directly to the connection terminal 6. The insulation arranged around the conductive core 10 can preferably be formed in the form of plastic, ceramic or the like and can be embodied, for example, as an insulating layer 8, insulating varnish, insulating film, insulating paint or the like.

Fig. 2a shows a schematic illustration of a module carrier unit 2 according to a second exemplary embodiment of the invention for contacting a battery module 18 in a plan view. According to this second embodiment of the module carrier unit 2 according to the invention, the module carrier unit in the present case has three connection ends 6 arranged in the edge region 4a of the carrier plate 4, of which two connection ends are arranged on mutually opposite sides.

Fig. 2b shows a schematic illustration of a module carrier unit 2 according to a third exemplary embodiment of the invention for contacting a battery module 18 in a plan view. According to a third exemplary embodiment, the module carrier unit 2 according to the invention comprises four connection terminals 6, which are arranged in the edge region 4a of the carrier plate 4, in each case two of which are arranged on opposite sides of the carrier plate 4, for contacting the

poles

12, 14 of the battery module 18. The more connection terminals 6 are arranged on a particular carrier plate 4 for contacting the

poles

12, 14 of the battery module 18 and the more evenly these connection terminals are distributed within the edge region 4a, the more flexible the respective connection possibilities are with respect to one of the

battery poles

12, 14 of the battery module 18 concerned.

Fig. 3a shows a schematic illustration of the arrangement of a battery module 18 according to a first embodiment on a module carrier unit 2 according to the invention for contacting the battery module 18. According to fig. 3a, the battery module 18 is arranged in the inner region 4b of the carrier plate 4 and has two connecting elements 16, which are arranged in the present case on the same side of the battery module 18, for connecting the

poles

12, 14 of this battery module 18 with the

poles

12, 14 of one or more battery modules 18. The connection device 16 can preferably be formed as a battery connector or the like and can advantageously be implemented at least partially flexibly. In the specific arrangement of the

poles

12, 14 of the battery module 18, no indirect connection according to the invention via the carrier plate 4 or the module carrier unit 2 according to the invention to the

poles

12, 14 of the other module 18 is required, since both

poles

12, 14 are arranged on the same side of the module 18 and can therefore be connected in a simple manner to the other battery module 18 which can be arranged next to it.

Fig. 3b shows a schematic illustration of the layout of a battery module 18 according to a second embodiment on a module carrier unit 2 according to the invention for contacting the battery module 18. The battery module 18 of the second embodiment likewise has two

poles

12, 14 which are led out on the upper side of the battery module 18, however, the two poles are arranged on different sides of the battery module 18. In this embodiment it is reasonable that: the pole 14, which in the present case is formed as a negative pole, is connected to the carrier plate 4 via the connection 6, for example, by means of the connection device 16, so that the carrier plate 4 is at the same potential as the negative pole 14 of the battery module 18 and the connection of the negative pole 14 of the battery module 18 to the

poles

12, 14 of the other battery module 18 can be effected simply via the carrier plate 4. This electrical connection can then be realized by means of a further connection device 16, which in the present case is arranged next to the positive pole 12. The positive pole 12 is already on the correct side so that the connection via the connection means 16 can be arranged directly on the positive pole.

In this way it is possible to: the use of long connecting means 16 for the electrical connection of the

poles

12, 14 of the battery module 18 is avoided and the wiring is only carried out via short connecting means 16 which are arranged compactly on the carrier plate 4. Not only is unnecessary weight of the long connecting device 16 saved thereby, but a simpler, more durable, and more efficient way of electrically connecting different battery modules 18 is provided.

Fig. 4a shows a schematic illustration of the arrangement of a battery module 18 according to a third embodiment on a module carrier unit 2 according to the invention for contacting the battery module 18. According to the present exemplary embodiment, the battery module 18 comprises a bolt 20, which is inserted into a sleeve 20', and a sleeve 20', by means of which the battery module 18 is screwed in the present case to the carrier plate or the base plate and by means of which contact can likewise be made. In the present case, one of the screws 20 is in this case connected via the sleeve 20' and the last of the battery cells 28 arranged inside the battery module 18 to the negative pole 14 of the battery module 18 by means of the connection 21, so that according to this embodiment a connection or contact-making of the battery module 18 to the carrier plate 4 can be achieved by the electrical connection of the carrier plate 4 to the relevant screw 20. Such electrical connections require bolts with enlarged contact surfaces at the bottom of the module. The contact surface is screwed to a carrier plate which does not allow insulation in the receiving region. The force required for reliable electrical contact is applied by means of a screw connection.

Fig. 4b shows the battery module 18 according to fig. 4a in a view rotated by 180 ° about the longitudinal side, in which the bottom of the battery module 18 is shown in a partial top view. It is possible to see the holes or threads of the bolts 20 inserted into the bottom, which bolts can preferably be used for contacting the carrier plate 4, in that electrically conductive fastening means, such as rivets, screws or pins, are screwed through the carrier plate 4 (not shown here) into the holes or threads of the bolts 20 or are otherwise inserted and fixed into the holes or threads of the bolts 20. The connection is then made in the present case by means of the holes or threads of the marked screws, which are connected to the negative pole 14 of the battery module 18 by means of a threaded sleeve inside the battery module 18.

Fig. 5 shows a schematic representation of a system 1 according to the invention for the wiring of a battery module 18 in a plan view. In this case, the system 1 has a base unit 22 which is configured to receive the module carrier unit 2 and is preferably formed in the form of a battery pack base or the like. The base unit 22 can be implemented not only electrically conductive, but also electrically non-conductive or insulating. In the present case, a total of ten recesses 26 arranged next to one another are arranged on the base unit 22 for receiving the module carrier units 2. In this case, these recesses 26 are formed in the present case non-conductively and electrically insulate the base unit 22 from the module carrier unit 2. In the present case, the carrier plate 4 is arranged in a sandwich-like manner between the base unit 22 or the recess 26 and the battery module 18 in the recess 26 or on the recess 26. Furthermore, within the scope of a compact layout, the cutouts 26 can also be formed and adapted to the carrier plate 4 such that the carrier plate 4 can be inserted into the cutouts 26 flush with the surface.

By means of the system according to the invention, a flexible connection of the battery module 18 with short connection paths is ensured independently of the arrangement of the

poles

12, 14 of the respective battery module 18, which enables a flexible selection of the battery module 18, in particular while maintaining a robust, cost-effective and energy-efficient embodiment.

Furthermore, in addition to the contacting and connection of the battery module 18, it is also possible with the system 1 in the present case for further energy stores, such as capacitors, fuel cells, solar cells or the like, to be arranged on the module carrier unit 2 and to be connected to one another and/or to the battery module 18.

Fig. 6 shows a schematic view of a partial section of a system 1 according to a second embodiment of the invention, which comprises coolant channels 24 for efficient heat dissipation. In the present case, the coolant channel 24 arranged inside the bottom unit 22 is arranged directly below the module carrier plate 4 in order to ensure as efficient a cooling or dissipation as possible of the heat generated during the current transmission. For electrical insulation between the carrier plate 4 and the coolant channel 24, the coolant channel 24 can either be insulated from the carrier plate 4 by means of the insulating layer 8 or can be operated by means of a coolant which is thermally conductive but electrically non-conductive, such as a thermally conductive oil or the like. With regard to efficient cooling, the coolant channels 24 can also preferably have flow-guiding means for guiding the flow, so that the heat generated during the current transmission can be dissipated as uniformly as possible from the battery module 18 or the particular system 1.

List of reference numerals

1 System for wiring of Battery modules

2 Module Carrier Unit

4 carrier plate

4a edge region

4b inner region

6 connecting end

8 insulating layer

10 Kernel

12 positive electrode

14 negative electrode

16 connecting device

18 battery module

20 bolt

20' sleeve

21 connection

22 base unit

24 coolant channels

26 recess

28 battery cells.

Claims

1. A module carrier unit (2) for contact-making of a battery module (18), the module carrier unit comprising:

-an electrically conductive carrier plate (4) for accommodating the battery module (18);

a plurality of connection terminals (6) for contacting poles (12, 14) of a battery module (18),

-wherein the connection ends (6) are arranged on the carrier plate (4) such that the length of a connection path for electrically connecting poles (12, 14) of the battery module (18) with poles (12, 14) of other battery modules (18) can be minimized independently of the layout of the poles (12, 14) of the battery module (18) to be connected.

2. The modular carrier unit (2) according to claim 1,

it is characterized in that the preparation method is characterized in that,

the carrier plate (4) has an electrically conductive core (10) and an insulating layer (8) arranged around the core (10).

3. The module carrier unit (2) according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the connecting end (6) is arranged within an edge region (4 a) of the carrier plate (4).

4. Modular carrier unit (2) according to one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the connecting ends (6) are arranged at least partially on mutually opposite sides of the carrier plate (4).

5. Modular carrier unit (2) according to one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the connecting end (6) is designed in such a way that a releasable electrical connection can be established between the battery poles (12, 14) and the connecting end (6).

6. A system (1) for wiring of battery modules (18), the system comprising:

-a base unit (22) for accommodating a modular carrier unit (2) according to one of claims 1 to 5;

-a plurality of modular carrier units (2) according to one of claims 1 to 5;

-a plurality of battery modules (18) arranged on the module carrier unit (2).

7. The system (1) according to claim 6,

it is characterized in that the preparation method is characterized in that,

the base unit (22) has an electrically insulating recess (26) for receiving the module carrier unit (2).

8. The system (1) according to claim 7,

it is characterized in that the preparation method is characterized in that,

the recess (26) is formed in the form of a recess for receiving the module carrier unit (2) flush with the surface.

9. System (1) according to one of claims 6 to 8,

it is characterized in that the preparation method is characterized in that,

the base unit (22) has a coolant channel (24) for cooling of the module carrier plate (4).

10. A method for contact-making of a battery module (18), the method comprising the steps of:

-establishing a first electrical connection between a first pole (12, 14) of a first battery module (18) and the module carrier unit (2);

-establishing a second electrical connection between the second pole (12, 14) of the first battery module (18) and the first pole (12, 14) of a second battery module (18);

-establishing a third electrical connection between the first pole of the first battery module (18) and the second pole (12, 14) of the second battery module (18) via at least one module carrier unit (2) in order to minimize the length of the connection path of the electrical connection between the first pole (12, 14) of the first battery module (18) and the second pole (12, 14) of the second battery module (18) independently of the layout of the poles of the battery modules (18) to be connected.