BATTERY CELL CONNECTION ELEMENT, BATTERY CELL CONNECTION MODULE, BATTERY CELL CONNECTION ARRANGEMENT AND METHOD FOR TEMPERATURE AND ELECTRICALLY CONTACTING BATTERY CELLS

Description

[0001] The invention relates to a battery cell connecting element according to claim 1.

[0002] Furthermore, the invention relates to a battery cell connection module according to claim 3.

[0003] The invention also relates to a battery cell connection arrangement comprising at least two battery cell connection elements according to the invention and at least one battery cell connection module according to the invention, according to claim 8.

[0004] Furthermore, the invention relates to a battery cell arrangement with a plurality of battery cells and with a battery cell arrangement according to the invention, according to claim 11.

[0005] Finally, the invention also relates to a method for tempering and electrically contacting battery cells of a battery cell arrangement according to claim 13.

[0006] In particular, the battery cell connection module and the battery cell connection element are hereinafter referred to simply as "connection module" and "connection element" respectively.

[0007] Electromobility is becoming increasingly important in today's industrial development. In order to provide the necessary electrical energy, for example to operate a traction motor in an automobile, a large number of battery cells are required to provide the necessary electrical energy. In this process, it is often necessary to electrically connect these battery cells to form larger battery cell arrays. At the same time, these battery cells heat up considerably, particularly during operation, so it is also necessary to temperature-control or cool the battery cells in a battery cell array. There is therefore a need for a way to connect battery cells of this type in a way that is both electrically conductive and thermally effective.

[0008] In order to exploit existing synergy effects, it has already been proposed in the past to implement the electrical contacting of the battery cells and their temperature control using an arrangement of at least partially electrically conductive fluid line elements. A corresponding approach is described, for example, in DE 10 2018 109 421 A1 from the applicant's company.

[0009] WO 2018 / 021084 A1 discloses an electrically conductive means with a cooling function that can be used in a battery arrangement for an electric vehicle. As can be seen specifically from the Figure 1 A tubular element has flattened, sealed ends that serve for electrical contact. Lateral openings are provided through which fluid connections are branched off. As a result, the previously known device requires a relatively large amount of installation space, both axially and laterally.

[0010] The concepts developed so far in this context have proven to be still capable of improvement in practical implementation, because they require a relatively large amount of installation space and a relatively large number of manufacturing steps, which makes the corresponding manufacturing processes time-consuming and costly.

[0011] The invention is based on the object of remedying this situation and of providing a battery cell connecting element, a battery cell connecting module, a battery cell connecting arrangement, a battery cell arrangement and a method for tempering and electrically contacting battery cells of a battery cell arrangement, with which the aforementioned disadvantages can be avoided in order to achieve a more time- and cost-effective production of electrical energy storage devices, in particular for automobiles, which require less installation space.

[0012] The object is achieved according to the invention by a battery cell connecting element having the features of claim 1, by a battery cell connecting module having the features of claim 3, by a battery cell connecting arrangement having the features of claim 8, by a battery cell arrangement having the features of claim 11 and by a method for tempering and electrically contacting battery cells having the features of claim 13.

[0013] Advantageous further developments of the inventive idea are defined in the subclaims.

[0014] According to the invention, a battery cell connecting element comprises a base body designed as a fluid line element made of an electrically conductive material with a longitudinal axis, which base body is closed fluid-tight at both ends and has a circumferentially substantially closed casing wall, in which casing wall at least two openings, preferably punched-out portions, are arranged on a same side of the base body, which openings are arranged offset next to one another in the direction of the longitudinal axis.

[0015] An embodiment of the battery cell connecting element according to the invention further provides that the base body is substantially flat in sections, at least on its side opposite the openings, so that flat sections of the base body are aligned with the openings in a direction transverse to the longitudinal axis. Preferably, the base body has two substantially flat, parallel side walls, in one of which the openings are arranged. Most preferably, the other, opposite side wall has a counter contour (complementary contour) of a battery cell arrester, in order to be able to connect the battery cell connecting element to the battery cell arrester as effectively as possible.

[0016] If, as described, the base body is configured to be substantially flat in sections on its side opposite the openings, where the term "substantially" is intended to include standard manufacturing tolerances, the battery cell connecting element can be connected in a particularly simple and secure manner to battery cell conductors or terminals, which are also substantially flat. If the aforementioned flat sections of the base body are aligned with the openings in a direction transverse to the longitudinal axis, a geometrically advantageous configuration is created, because in (previously known) battery cell arrangements, the cell conductors of adjacent battery cells are generally arranged next to one another in a line.

[0017] An alternative embodiment of the battery cell connecting element comprises a base body designed as a fluid conducting element made of an electrically conductive material with a longitudinal axis, which base body is open at both ends and has a circumferentially substantially closed casing wall.

[0018] A combination of both designs of the battery cell connecting element with open ends and the aforementioned openings is also possible: the openings serve to insert a (welding) tool for connecting the connecting elements to electrical conductors of the battery cells (more on this below) and can be closed after assembly (using suitable plugs).

[0019] A battery cell connection module according to the invention comprises at least two receptacles, which receptacles are designed for the positive and / or non-positive reception of a battery cell connection element, and a fluid line section, which fluid line section has a fluid inlet line and a fluid outlet line, in which at least the fluid line section is designed in an electrically non-conductive material, preferably plastic, and in which the fluid inlet line and the fluid outlet line are arranged relative to the receptacles in such a way that the fluid inlet line is in fluid-conducting connection with one receptacle and the fluid outlet line is in fluid-conducting connection with the other receptacle.

[0020] A battery cell connection arrangement according to the invention comprises at least one first battery cell connection element, at least one second battery cell connection element, and at least one battery cell connection module, wherein the first battery cell connection element and the second battery cell connection element are each arranged in a respective receptacle, so that, on the one hand, the first battery cell connection element is in fluid-conducting connection with one of its openings to the fluid supply line and, on the other hand, the fluid outlet is in fluid-conducting connection with one of the openings of the second battery cell connection element, or so that the two battery cell connection elements are in fluid-conducting connection with one another via one of their openings and via the fluid line section, wherein in each case the two battery cell connection elements are spaced apart from one another so that there is no electrically conductive connection between the connection elements.

[0021] When the alternative embodiment of the battery cell connecting element is used, a correspondingly adapted alternative battery cell connecting arrangement comprises at least one first (alternative) battery cell connecting element, at least one second (alternative) battery cell connecting element and at least one battery cell connecting module, wherein the first (alternative) battery cell connecting element and the second (alternative) battery cell connecting element are each arranged in a respective receptacle,so that, on the one hand, the first (alternative) battery cell connecting element is in fluid-conducting connection with one of its open ends to the fluid supply line and, on the other hand, the fluid outlet is in fluid-conducting connection with one of the open ends of the second battery cell connecting element, or so that the two (alternative) battery cell connecting elements are in fluid-conducting connection with one another via one of their open ends and via the fluid line section, wherein in each case the two (alternative) battery cell connecting elements are spaced from one another by the intermediate fluid line section so that there is no electrically conductive connection between the (alternative) connecting elements.

[0022] A battery cell arrangement according to the invention comprises a plurality of battery cells and a, in particular alternative, battery cell connection arrangement, wherein the individual battery cells each have a first cell conductor with a first electrical polarity and a second cell conductor with a second electrical polarity, in which the first cell conductor of a battery cell is electrically conductively connected to the second cell conductor of another battery cell via a, in particular alternative, battery cell connection element, and in which the first, in particular alternative, battery cell connection element is fluidly connected to the second, in particular alternative, battery cell connection element via the fluid line section of the battery cell connection module.

[0023] A method according to the invention for tempering and electrically contacting battery cells of a battery cell arrangement includes: a) Providing at least two, in particular alternative, battery cell connecting elements; b) Providing at least one battery cell connecting module; c) Arranging the battery cell connecting elements in the battery cell connecting module to create a, in particular alternative, battery cell connecting arrangement; d) Producing the battery cell arrangement by attaching the, in particular alternative, battery cell connecting arrangement to an arrangement of battery cells and electrically conductively, preferably materially, connecting the, in particular alternative, battery cell connecting elements to the cell conductors; e) Flowing a temperature control fluid through the, in particular alternative, battery cell connecting elements and the fluid line section or sections; and f) Electrically contacting the battery cells via the, in particular alternative, battery cell connecting elements.

[0024] The starting point of the present invention is therefore the above-defined, in particular alternative, battery cell connecting element, which can function both as an electrical connector and as a fluid conduction element and is accordingly suitable for conducting a temperature control fluid for a battery cell arrangement. Due to the design of its base body made of an electrically conductive material, the battery cell connecting element according to the invention can be used to connect electrical terminals (of different polarity) in a battery cell arrangement.

[0025] However, the invention also encompasses battery cell connecting elements in which not the entire base body is made of an electrically conductive material, but only parts thereof. The two openings enable a simple (material-to-material) connection of the battery cell connecting element to the aforementioned electrical connections of a battery cell arrangement, because a correspondingly used tool can be inserted through the openings. In the alternative embodiment, a (material-to-material) connection of the battery cell connecting element to the aforementioned electrical connections of a battery cell arrangement preferably takes place by means of a fillet weld between an (outer) wall of the connecting element and the aforementioned electrical connections.

[0026] The battery cell connecting element according to the invention can thus be used to construct battery cell arrangements in a simple and cost-effective manner. This will be discussed in more detail below.

[0027] Advantageously, the battery cell connecting element according to the invention, in its two alternatives, can be used together with a battery cell connecting module according to the invention, which has battery cell connecting module receptacles for receiving battery cell connecting elements according to the invention. In this way, the interaction of the battery cell connecting element and the battery cell connecting module makes it possible to create a battery cell connecting arrangement according to the invention that enables the production of battery cell arrangements according to the invention in a particularly simple and cost-effective manner. This will also be discussed in more detail below.Within the scope of the present invention, it is possible in this way to create a preconfigured battery cell connection arrangement according to the invention by bringing together (at least two) battery cell connection elements according to the invention and at least one battery cell connection module according to the invention, by the use of which electrically contactable and thermally temperature-controlled battery cell arrangements can be produced particularly easily.

[0028] In this way, the present invention also provides a method according to the invention for tempering and electrically contacting battery cells of a battery cell arrangement, which method is based on the above-described use of (at least two) battery cell connecting elements according to the invention and a battery cell connecting module according to the invention, which together form a battery cell connecting arrangement according to the invention.

[0029] The further developments of the battery cell connecting element according to the invention described below also apply to its alternative design, unless they specifically relate to the openings as such or the fluid-tight sealed ends.

[0030] Another development of the battery cell connecting element according to the invention provides that the base body, at least with the exception of its (closed) ends, has an oval cross-section. Such a configuration has proven particularly advantageous in terms of manufacturing technology and also with regard to the required installation space. The oval cross-section is advantageously created by forming a central, rectangular cross-section with attached semicircles and accordingly has the shape of a "stadium oval." However, the invention is by no means limited to such cross-sections of the base body.

[0031] In yet another embodiment of the battery cell connecting element according to the invention, the base body can be flattened and / or folded at its ends and thus closed. Additionally, the base body can be sealed at its ends by a material bond, in particular by welding or soldering. This also results in a particularly simple battery cell connecting element in the manner of a fluid line element closed at the end, which can be advantageously used within the scope of the present invention.

[0032] In order to be able to compensate in particular for manufacturing tolerances, dimensional tolerances and thermal geometry changes, a highly preferred development of the battery cell connecting element according to the invention provides that the base body has two substantially identical halves along its longitudinal axis, between which a central section with a modified shape is arranged, which central section preferably has at least one circumferentially encircling bellows corrugation, most preferably a plurality of such bellows corrugations, and is preferably formed integrally with the remaining base body.

[0033] Such bellows corrugations or ring corrugations are known to those skilled in the art and have been used for decades in flexible metal hoses, particularly to absorb thermally induced movements and deformations.

[0034] Yet another development of the battery cell connecting element according to the invention provides that the openings have a clear opening cross-section suitable for inserting a tool, preferably a welding tool, preferably a clear opening cross-section of approximately 5 mm to approximately 30 mm. It has already been pointed out that the aforementioned openings can advantageously be used to insert a tool into the battery cell connecting element in order to connect it (in a material-to-material manner) to a cell conductor of a battery cell. As the applicant has discovered, the dimensions specified above are particularly suitable in this context.

[0035] A first development of the battery cell connection module according to the invention provides that it has a first number of more than two receptacles and a second number of more than one fluid line section. Each fluid line section always connects at least two receptacles to one another in a fluid-conducting manner.

[0036] While, within the scope of the present invention, the battery cell connecting elements described above can also provide for the electrically conductive connection of two battery cell cell conductors in addition to their fluid conduction function, the battery cell connecting module according to the invention, with its fluid conduction section, serves to connect two battery cell connecting elements to one another in a fluid-conducting manner. Due to the design of at least the fluid conduction section in an electrically non-conductive material, it is simultaneously ensured that battery cell cell conductors are not inadvertently electrically connected to one another, which could lead to a short circuit. In this way, it is possible to separate the electrical contacting of the battery cells from their temperature control.

[0037] As a rule, battery cells are arranged adjacently in such a way that the arrangement of the electrical poles is swapped between two directly adjacent battery cells. For example, in this way a positive pole of a first battery cell is located next to the negative pole of another battery cell and vice versa. With the aid of a battery cell connecting element according to the invention, two such adjacent connections of different polarity can be electrically connected to one another in order to be able to connect several battery cells in series. The interaction of a battery cell connecting element according to the invention with a battery cell connecting module according to the invention now makes it possible to continue the fluid conduction function ensured by the battery cell connecting element via the battery cell connecting module and its fluid conduction section, with electrical separation, to another, directly adjacent cell arrester.In this way, the series connection of the battery cells described above can be achieved without causing an electrical short circuit.

[0038] If the battery cell connecting element is equipped with open ends, an electrically non-conductive line element, preferably made of plastic, can be inserted (introduced or pushed) into the battery cell connecting elements to conduct fluid from connecting element to connecting element. This also makes it possible to continue the fluid conduction function ensured by the battery cell connecting element via the line element while electrically isolating it to another, immediately adjacent cell arrester. In this way, the series connection of the battery cells described above, along with temperature control, can also be achieved - as part of an alternative method - without causing an electrical short circuit. The line element can penetrate several connecting elements connected in series and connect them fluidically.

[0039] If the battery cell connecting element has openings of the type mentioned, the line element can have corresponding openings.

[0040] The openings of the connecting element and the line element, which are aligned in the assembled state, can then be sealed fluid-tight together with a plug or closure part.

[0041] The battery cell connecting element and the line element can be connected to one another by a material bond. For this purpose, at least one adhesive groove or the like (i.e., a defined structure for receiving adhesive as a connecting and sealing agent) can be provided on the connecting element, which is preferably filled with adhesive from the outside via an opening before or after the line element is inserted. Alternatively or additionally, at least one adhesive groove or adhesive channel can be provided on the line element, which essentially serves the same purpose.

[0042] After being inserted into one or more battery cell connecting elements, the cross-section of the conducting element can be enlarged ("inflated" or otherwise deformed outwards) in order to line the battery cell connecting element(s) in a force-fitting or form-fitting manner.

[0043] The first development of the battery cell connection module according to the invention already mentioned above provides that a larger number of battery cells can also be connected to form a correspondingly large battery cell arrangement.

[0044] Yet another development of the battery cell connection module according to the invention provides that the fluid line sections and / or the receptacles run in or parallel to a common plane and / or are arranged distributed over the circumference of a rectangle. This results in an arrangement comprising the battery cell connection elements according to the invention and the battery cell connection module according to the invention, which is particularly suitable for subsequent use with an array of battery cells in order to connect them to one another in the manner described above.

[0045] Yet another development of the battery cell connection module according to the invention provides that a first fluid line section has a supply line for a temperature control fluid to the first fluid line section, and a second fluid line section has an outlet for a temperature control fluid from the second fluid line section. In this way, the battery cell connection module can be connected to an external temperature control or cooling circuit via the supply line or connected to such a circuit. The temperature control fluid then returns to this external circuit via the outlet.

[0046] Yet another development of the battery cell connection module according to the invention provides that the fluid line section or sections are open on a first side of the battery cell connection module, and in which the receptacles are arranged on a second side of the battery cell connection module facing away from the first side. Such a configuration ensures that, via the fluid line sections open on one side, even with battery cell connection elements that are already accommodated in the corresponding receptacles of the battery cell connection module, the openings continue to be accessible from the outside in the manner described above in order to (materially) connect the battery cell connection elements to the cell conductors.In other words, the battery cell connectors can first be inserted into the battery cell connector module, and then the battery cell connectors are connected to the cell conductors. This greatly simplifies handling, especially of the battery cell connectors.

[0047] This also applies analogously to the alternative design of the battery cell connecting elements, which, however, do not provide any openings, so that external accessibility plays a less important role, as long as the connection option described above (fillet weld welding) is retained. The fluid line section can simply be another (pipe) line section, which is always arranged (interposed) between two open ends of different battery cell connecting elements.

[0048] In order to nevertheless ensure the aforementioned fluid conduction of the temperature control fluid via the battery cell connecting elements and the battery cell connecting module, a highly preferred further development of the battery cell connecting module provides that it additionally has at least one cover part, which cover part seals the at least one fluid line section, preferably several fluid line sections, most preferably all fluid line sections, in a fluid-tight manner to the outside. For this purpose, corresponding sealing elements can advantageously be arranged or molded onto the cover part or in a peripheral region of the fluid line sections. The same also applies to the area of the fluid supply line and the fluid outlet line of the battery cell connecting module, at which points it interacts with a battery cell connecting element in the region of one of the relevant openings.This ensures fluid tightness in all cases. With the alternative design of the battery cell connecting elements, such a cover part is essentially unnecessary.

[0049] Yet another development of the battery cell connection module according to the invention provides that it has a further receptacle for receiving an electronic circuit board (PCB - Printed Circuit Board). This further receptacle is preferably surrounded by the receptacles for the battery cell connection elements and by the fluid line sections. In this way, the installation space usually available in battery cell arrangements centrally above the battery cells can be advantageously used for the arrangement of an electronic circuit board in particular, because an (electrically conductive and / or fluid-conducting) connection of the cell conductors is usually only required in the edge regions of the battery cell arrangement.

[0050] Furthermore, in a further development of the battery cell connection module according to the invention, galvanic connections can be provided from the additional receptacle, extending to the receptacles for the battery cell connection elements. This makes it easy to electrically connect the circuit board accommodated in the additional receptacle to the battery cell connection elements.

[0051] This may be necessary or advantageous, for example, if the electronic board is intended to form a battery management system (BMS). In this context, it may be necessary, for example, to determine and / or adjust the potential of the individual battery cells. The aforementioned galvanic connections can be used for this purpose because complex, additional wiring of the battery cell arrangement to the BMS (the electronic board) is unnecessary.

[0052] A further design for the connection to the electronic circuit board can be achieved by printing (for example, using screen printing or pad printing) conductor tracks onto the battery cell connection module. This eliminates the need for complex galvanic connection structures, making the component lighter and more cost-effective. Contacting can be ensured using mechanically preloaded spring elements.

[0053] A first refinement of the battery cell connection arrangement according to the invention provides that the battery cell connection elements and the fluid line sections together form a closed fluid circuit. If necessary, this closed fluid circuit can be sealed off from the outside by the cover part mentioned above. The term "closed fluid circuit" expressly includes the presence of the supply and outlet lines for the temperature control fluid mentioned above.

[0054] Yet another development of the battery cell connection arrangement according to the invention provides that the battery cell connection elements, optionally with the cover part removed, are accessible from the first side via the fluid supply line or the fluid outlet and via the respective openings from the outside. This ensures that the use of a battery cell connection arrangement according to the invention with a corresponding development enables a subsequent (materially bonded) connection of the individual battery cell connection elements from the aforementioned first side to the cell conductors of a battery cell arrangement. This facilitates the handling of the aforementioned elements, as already mentioned.

[0055] Yet another development of the battery cell connection arrangement according to the invention provides that an electronic circuit board is accommodated in said further receptacle, which electronic circuit board preferably has electronic components for controlling the operation of a battery cell arrangement comprising a plurality of battery cells. This has already been mentioned above.

[0056] In order to avoid, in particular, time-consuming and costly subsequent wiring or cabling of the electronic circuit board, yet another development of the battery cell connection arrangement according to the invention provides that the electronic circuit board and / or at least some of the electronic components located thereon electrically contact the battery cell connection elements via the aforementioned galvanic connections or are in electrically conductive connection with them.

[0057] It has proven particularly advantageous for practical use if the battery cell connecting elements are held in a form-fitting and / or force-fitting manner on the battery cell connecting module in the region of the receptacles. In particular, so-called snap-in, clamp-in, or clip connections are suitable in this area, which can be implemented particularly easily and cost-effectively, especially if the battery cell connecting module is formed as an injection-molded part in a plastic material. However, the invention is by no means limited to such a configuration of the battery cell connecting module.

[0058] Any sealing elements already mentioned can be directly molded or cast onto the battery cell connection module during manufacture (2K injection molding). The use of separate sealing elements is also possible. This particularly applies to the transitions from the battery cell connection elements to the battery cell connection module and from the battery cell connection module to the cover part. Corresponding sealing elements can also be arranged on the cover part.

[0059] In a first refinement of the battery cell arrangement according to the invention, the battery cell connecting elements can be integrally connected to the cell conductors. This has already been pointed out repeatedly. Such a connection is particularly secure and durable.

[0060] Yet another development of the battery cell arrangement according to the invention provides that the battery cell connecting elements and the fluid line section or sections are filled with a temperature control fluid (dielectric) or are permeated by such a temperature control fluid. In this way, particularly efficient temperature control of the battery cells or cell dischargers can be achieved.

[0061] Finally, a further development of the method according to the invention provides that in step d) the battery cell connecting elements are connected, preferably welded, to the cell conductors from the outside through the fluid supply line or the fluid outlet and via the respective openings, and in which subsequently, before step e), the cover part is placed on to close the battery cell connecting arrangement and the relevant fluid flow paths.

[0062] In this way, the present invention makes it possible to transfer the arrester cooling of cell arresters in a battery cell arrangement into a arrester cooling module or to further develop it into one. According to the above description, the aforementioned (battery cell connection) module comprises a frame-like base body, which is preferably made of injection-molded plastic. The metallic elements (the battery cell connecting elements) for electrically connecting the battery cells can be inserted into this base body and advantageously fixed via a clip or snap connection or the like. This results in an assembly / handling aid, as described above, which can ideally support the advantageously relatively thin-walled connecting elements during their (elastic) molding onto the cell arresters.The base body made of an electrically non-conductive material (preferably injection-molded plastic) also ensures the insulation of all components with a different electrical potential.

[0063] It has already been mentioned that the (metallic) connecting elements can be manufactured directly from a semi-finished product (pipe) by forming. For end-to-end sealing, the respective ends (pipe ends) can be crimped and welded or soldered. Soldering, in particular, can also influence the material properties in a single process step.

[0064] The required fluid seal (for the temperature control fluid) can be achieved by inserting the metallic connecting elements and securing them to the connection module by means of an elastic form fit, particularly in the area of the openings.

[0065] Advantageously, the metallic connecting elements are made of a material with good electrical and thermal conductivity, preferably an aluminum alloy or copper.

[0066] One design variant provides for the aforementioned base body of the battery cell connection module to be manufactured in a multi-component injection molding process and for the sealing elements required for sealing against the connecting elements, which were already referred to above, to be directly injected (molded) onto it.

[0067] Furthermore, within the scope of another development of the invention, it is proposed to notch the connecting elements above the battery terminals (cell conductors), thus creating access to the welded seam connection between the metallic connecting elements and the cell conductor. This has already been repeatedly mentioned above (openings, punched-out sections). Furthermore, this can result in the advantage that the fluid channels for the temperature control fluid can be produced in a single assembly step in the z-direction. The aforementioned z-direction refers to a (vertical) direction transverse to a plane containing the cell conductors of a battery cell arrangement. However, the invention is by no means limited to such a geometry; in principle, it is possible to form inlets and outlets for the temperature control fluid within or parallel to the aforementioned plane.

[0068] Within the scope of another development of the invention, it is possible to attach the cover part for closing the fluid-carrying channels to the remaining connection module via film hinges, so that the handling effort is reduced.

[0069] In a further development of the method already described above, it is within the scope of the present invention to first produce the connection module using a (2K) injection molding process and then to produce the metallic connection elements and clip them into the connection module. The metallic connection elements can then be elastically molded onto the cell conductors of a battery cell arrangement by being supported in / on the base body (of the connection module) while the latter is fastened, for example by clipping, to the battery cell arrangement. The electrical connections of the metallic connection elements to the cell conductors are then created in a welding process, preferably in the z-direction. The fluid channels are then closed by fitting the cover part. At the end of these process steps, a leak test can be carried out.

[0070] Deviating from the above description, a variant is possible in which a (metallic) connecting element forms a so-called module conductor. In other words: At least one of the metallic connecting elements can protrude (laterally) from the battery cell arrangement and thus form the aforementioned module conductor, i.e., an electrical connection for the entire battery cell arrangement.

[0071] It has already been mentioned that certain galvanic connections can be provided, for example, to integrate a BMS into the base body of the connection module. Further developing this idea, designs are possible in which temperature measuring elements or other types of sensors are integrated directly into the base body of the connection module.

[0072] It has already been pointed out that the module base body is preferably made of a plastic. In a further development of this idea, we specifically suggest manufacturing the base body of the connecting module from PP30GF or PA.

[0073] A multi-part variant can be provided, in which the base body of the connection module secures the metallic connecting elements, and an additional fluid line body, which is attached to the battery cell assembly only after the base body has been assembled, is used to close the fluid channels. This essentially corresponds to the use of a cover part already mentioned above.

[0074] In a further development of this idea, it can be provided that the fluid line body(s) (cover part(s) are sealed with a seal or an injection-molded sealing element that is mechanically prestressed, or that the sealing is carried out via an adhesive connection, which in turn can be fixed via a clip connection or the like until the adhesive has completely cured.

[0075] Furthermore, channels for battery cell degassing can be provided in the battery cell connection module. In this context, it is possible to form these channels in the plastic or to form them as additional (metallic) inserts. Such a design can advantageously allow for fluid inlet or outlet, as well as the electrical contact, to be positioned almost completely freely on the connection module.

[0076] The invention described above is characterized by its lightweight construction properties, the extensive functional integration, the ease of assembly and handling, its modular design, the achievable electrical insulation and the interface thus created with the automotive industry.

[0077] Further features and advantages of the invention will become apparent from the following description of embodiments with reference to the drawings. Figure 1 shows an isometric view of a battery cell arrangement with battery cell connecting elements arranged thereon; Figure 2 shows an isometric detailed view of a battery cell connecting element; Figure 3a shows a first sectional view of the battery cell connecting element from Figure 2 ; Figure 3b shows a second sectional view of the battery cell connecting element from Figure 2 ; Figure 4 shows the battery cell arrangement from Figure 1with a battery cell connection module according to the invention in isometric view without cover part; Figure 5 shows the battery cell arrangement from Figure 4 with the cover part attached; Figure 6 shows a first section through the battery cell arrangement according to Figure 5 in detail; Figure 7 shows a second section through the battery cell arrangement according to Figure 5 in detail; Figure 8 shows an alternative embodiment of the battery cell connecting element and the battery cell connecting module; Figure 9 shows an alternative embodiment of a battery cell arrangement in a perspective overall view; Figure 10 shows a partial longitudinal section through the embodiment according to Figure 9 ; Figure 11 shows a partial cross-section through the embodiment according to Figure 9; and Figure 12 shows a partial cross-section through one of the embodiments according to Figure 9 alternative design. In the following detailed description of the figures, identical reference symbols designate identical or at least identically functioning elements. For reasons of clarity, not all elements appearing in each figure are explicitly identified. Therefore, in some cases, reference is made to other figures in the description of these figures.

[0078] Figure 1 shows an isometric overall view of an arrangement of battery cells (battery cell arrangement), which is designated in its entirety by the reference numeral 1. Reference numeral 2 denotes the individual battery cells, which are designed as so-called prismatic cells, without the invention being limited thereto, however. Each of the battery cells 2 is arranged in an approximately cuboid-shaped housing and has two so-called cell conductors 3 on its upper side, of which Figure 1only two are explicitly designated. Each battery cell 2 has a cell conductor with a first electrical polarity (for example, positive pole) and a second cell conductor with a second electrical polarity (for example, negative pole). Figure 1 some of the battery cells 2 or cell conductors 3 are explicitly marked with corresponding symbols (+ or -).

[0079] The battery cells 2 are electrically arranged in a series circuit, so that the voltages of the individual battery cells 2 add up to a larger total voltage. For this purpose, the battery cells 2 are arranged alternately with reversed electrical polarity, as shown. In other words: a cell arrester 3 with the first polarity of a given battery cell 2 is arranged directly adjacent to the cell arrester 3 with the second polarity of an adjacent battery cell 2, as shown. For reasons of clarity, Figure 1Not all cell conductors 3 are designated with a corresponding electrical polarity. The dashed meandering line in Figure 1 symbolizes a current flow path or current flow S through the battery cell arrangement 1. For this purpose, the cell conductors 3 of adjacent battery cells 2 with different polarity are each electrically connected to a battery cell connecting element 4. The exact design of the battery cell connecting elements 4 will be explained below, in particular with reference to Figures 2, 3a and 3b discussed in more detail.

[0080] In addition to the battery cell connecting elements 4 already mentioned, which each electrically connect different poles or cell conductors 3 of adjacent battery cells 2 with different electrical polarity, there are in the embodiment according to Figure 1or similarly designed battery cell connecting elements 4', each of which is electrically connected to only one battery cell conductor. According to the illustration in Figure 1 These battery cell connecting elements 4' are located at the beginning and end of the current flow path S and can thus preferably be used as so-called module arresters for electrically connecting the battery cell arrangement 1 to an external circuit. The battery cell connecting elements 4' differ from the previously mentioned battery cell connecting elements 4 essentially only in the absence of bellows corrugations in the central region of the battery cell connecting elements. This will also be discussed in more detail below.

[0081] Within the scope of the present invention, the battery cell connecting elements 4 not only serve to electrically connect adjacent battery cells 2, but they also fulfill a fluid conduction function for a temperature control fluid for controlling the temperature of the battery cells 2. This aspect will also be discussed further below.

[0082] On the subject of Figure 1 It should also be noted that adjacent battery cell connecting elements 4, 4' do not touch each other, so that no electrically conductive contact is formed between them. Such contact could otherwise lead to a short-circuit of the battery cell arrangement 1 and to the destruction of the battery cells 2.

[0083] In Figure 2 is a single battery cell connecting element 4 according to Figure 1shown in more detail. It comprises a base body 44 designed as a fluid conduction element (pipe section) made of an electrically conductive metal with a longitudinal axis L, which base body 44 is fluid-tightly sealed at its two ends 4a, 4b. The base body 44 has a circumferentially substantially closed casing wall, in which casing wall at least two openings 4da, 4ea, preferably punched out sections, are arranged on a same side of the base body. The openings 4da, 4ea are arranged offset next to one another in the direction of the longitudinal axis L.

[0084] In particular, the battery cell connecting element 4 is essentially designed as a flat pipe element with a flat, oval cross-section in many areas, as can be seen in particular from Figure 3bAt its front ends 4a, 4b, the battery cell connecting element 4 is sealed in a fluid-tight manner, for example, folded or integrally connected, for example, soldered. These front sides of the battery cell connecting element 4 are in Figure 2 designated by reference numerals 4aa and 4ba. In its central region between the ends 4a, 4b, the battery cell connecting element 4 has a corrugated section 4c in which a number of ring corrugations or bellows corrugations 4ca are formed. In the regions between each of its ends 4a, 4b and the corrugated region 4c, the battery cell connecting element 4 is essentially planar and has parallel side surfaces (side walls) or shell surface sections (shell wall sections), of which Figure 2only two are designated by reference numerals 4d and 4e. In each of these flat lateral surface sections 4d, 4e, an opening 4da, 4ea is formed, which defines an opening 4db, 4eb that communicates with an interior of the battery cell connecting element 4. In particular, through each of the openings 4da, 4ea, the Figure 2 The bellows corrugations 4ca and the corrugated area 4c ensure a certain elastic deformability of the battery cell connecting element in the direction of its longitudinal axis L, as shown. For this reason, the battery cell connecting elements 4 of the Figure 2 shown type according to Figure 1 for connecting different battery cells 2 (cf. Figure 1 ) used. Figure 3a shows a section through the battery cell connecting element 4 of the Figure 2along the longitudinal axis L. Figure 3b shows a section across it, for example according to the dashed vertical line in Figure 3a .

[0085] Accordingly, in the battery cell connecting element 4 shown, it is provided that the base body 44 is partially formed at least on its side opposite the openings 4da, 4ea (at reference symbols 4d', 4e'; cf. Figure 3a, 3b ) is substantially planar, so that preferably planar sections of the base body 44 are aligned with the apertures 4da, 4ea or the openings 4db, 4eb in a direction transverse to the longitudinal axis L. Specifically, the base body 44 accordingly has at least two side walls 4d, 4d' and 4e, 4e', which are arranged parallel to one another and are substantially planar in some sections, in each of which the respective aperture 4da, 4ea is arranged.

[0086] In Figure 3aThe black block arrows symbolize the already mentioned accessibility of the lower side surfaces or side walls 4d' and 4e' via the openings 4da, 4ea or the openings 4db, 4eb. In this way, the battery cell connecting element 4 can be connected to the underlying cell conductors 3 (in Figure 3a The direction symbolized by the block arrows 3a generally corresponds to the -z direction. The dashed arrow in Figure 3asymbolizes a possible flow path for the aforementioned temperature control fluid through the battery cell connecting element 4. Without restriction, the temperature control fluid can flow into the battery cell connecting element through the opening 4db and leave it again via the opening 4eb, as shown. In this way, the battery cell connecting element 4 can be used both for the electrically conductive connection of cell conductors 3 and for their temperature control, which will be discussed in more detail below. For this purpose, the battery cell connecting element 4 is preferably made of a metallic, electrically (and thermally) highly conductive material, in particular copper or an aluminum alloy (without restriction).

[0087] The Figure 3b , which has already been mentioned, shows a cross section through the battery cell connecting element 4 approximately according to the vertical, dashed line in Figure 3a. Accordingly, the battery cell connecting element in this area (and correspondingly also on the other side of the corrugated area 4c, cf. Figure 3a ) has a flat, oval cross-section, so that the previously mentioned side surfaces or casing wall sections 4d, 4e or 4d', 4e' are flat in the aforementioned areas. This particularly simplifies the connection of the battery cell connecting element 4 to the cell conductors 3 (see Figure 3a ).

[0088] Figure 4 shows a further isometric overall view of a battery cell arrangement 1 with several battery cells 2 and battery cell connecting elements 4, 4' connected to the cell conductors of the battery cells 2 according to Figure 1 or according to the Figures 2 to 3b However, the representation in Figure 4the aforementioned cell conductors and battery cell connecting elements 4, 4' are only partially visible because a battery cell connecting module 5 made of injection-molded plastic was placed on top of the battery cell arrangement 1 and accordingly also on the aforementioned battery cell connecting elements 4, 4'.

[0089] In the introductory part of the description it was already pointed out that advantageously - deviating from the previous description of the figures - the battery cell connecting elements 4, 4' (cf. Figure 1 ) in or on the battery cell connection module 5 according to Figure 5are arranged, wherein they are advantageously held in or on the battery cell connection module 5 in a force-fitting and / or form-fitting manner, for example by clip connections or the like. Subsequently, the battery cell connection module 5 with the battery cell connection elements 4, 4' is placed onto the battery cell connection arrangement 1 or the battery cells 2, as shown in Figure 4 shown. Suitable fastening structures (not shown) may be present on the battery cells 2, which interact with corresponding, complementary fastening structures (also not shown) on the battery cell connection module 5 to fasten the battery cell connection module 5 to the battery cells 2. The battery cells 2 may also be installed in a (module) housing (not shown) and mechanically prestressed. The fastening structures for mounting the battery cell connection module 5 are then preferably provided on this housing.

[0090] We will now discuss specific details of the battery cell connection module 5 in more detail: The battery cell connection module 5 is designed in the manner of a flat frame (as a base body) made of injection-molded plastic, which has a central recess 5a. A PCB (electronic circuit board) 6 is arranged in this central recess 5a, which is equipped with a series of electronic components 6a, of which, for reasons of clarity, Figure 4 only one is described in more detail. The PCB 6 is not inherently a component of the battery cell connection module 5. Around the aforementioned central recess 5a, the battery cell connection module 5 has a number of fluid line sections 5b, 5b', which are also formed as recesses in the battery cell connection module 5. The differences between the various fluid line sections 5b, 5b' will be discussed in more detail below.

[0091] Each of the fluid line sections 5b, 5b' has two terminal openings 5ba, 5bb, one of which functions as a fluid inlet and the other as a fluid outlet. On its Figure 4 The battery cell connection module 5 has receptacles for the positive and / or non-positive reception of battery cell connection elements 4, 4' (cf. Figures 1 to 3b ), wherein these receptacles are designed or arranged and adapted to the dimensions of the battery cell connecting elements 4, 4' in such a way that the openings 5ba, 5bb of the battery cell connecting module 5 each correspond to one of the openings 4db, 4ed (cf. Figures 2 to 3b ) of the battery cell connecting elements 4 correspond fluidically. In other words: a distance between adjacent openings 5ba, 5bb of two different fluid line sections 5b, 5b' corresponds exactly to a distance between the two openings 4db, 4eb of a battery cell connecting element 4 (cf. Figures 2 to 3b). The dimensions of the openings 5ba, 5bb and the openings 4da, 4ea (of the openings 4db, 4eb) are also coordinated. The specified distance can vary depending on whether the battery cell connecting element in question is a battery cell connecting element 4 with a corrugated area 4c or a battery cell connecting element 4' without a corrugated area (cf. Figure 1 ). At an upper edge of each of the recesses or fluid line sections 5b, 5b', a circumferential seal 5c is provided, which can be designed as a separate sealing element or molded onto the battery cell connection module 5. Comparable seals (not visible) are located at the bottom of the battery cell connection module 5 in the area of the openings 5ba, 5bb, where the battery cell connection module 5 interacts with the battery cell connection elements 4, 4' in a fluid-conducting manner.

[0092] The fluid line sections 5b' are longer than the fluid line sections 5b and each have an additional opening 5bc, which is fluidically connected to a supply line 5d or to an outlet line 5e for a temperature control fluid. In this way, a temperature control fluid can be supplied to the battery cell connection module 5 and also discharged from it again. The fluid line sections 5b, 5b' complement the battery cell connection elements 4 arranged below the battery cell connection module 5 (see. Figures 1 to 3b ) to a double-flow flow channel for the tempering fluid, which connects the inlet line 5d with the outlet line 5e. This is shown in Figure 4for a flow branch is shown schematically, see the (dashed) arrows. The solid arrows symbolize a flow of the temperature control fluid on the top side of the battery cell connection module 5 through the fluid line sections 5b and 5b', respectively, while the dashed arrows in Figure 4 a flow of the tempering fluid through an underlying battery cell connecting element 4 according to the Figures 1 to 3b symbolize. The transition of the temperature control fluid from the fluid line sections 5b, 5b' to the battery cell connecting elements 4 takes place through the corresponding or communicating openings, as described above.

[0093] In this way, the (in Figure 4 not visible) cell conductors of the battery cells 2 are electrically contacted on the one hand (cf. Figure 1) and on the other hand efficiently tempered (cooled), whereby the tempering fluid preferably does not follow the same meandering flow path as the one based on Figure 1 illustrated current flow p.

[0094] Since the individual battery cell connecting elements 4, 4' according to Figures 1 to 3b do not touch each other and the fluid line sections 5b, 5b' according to Figure 4 together with the remaining battery cell connecting module 5 are formed from an electrically non-conductive plastic, no electrical short circuit of the battery cell arrangement 1 occurs in this way - advantageously even if no (costly) dielectric is used as the temperature control fluid.

[0095] At reference numerals 5f and 5g, the battery cell connection module 5 has lateral recesses through which individual battery cell connection modules 4, 4' are accessible from the outside. Such battery cell connection modules 4, 4' can thus be used in a simple manner to electrically contact the entire battery cell arrangement 1.

[0096] The black block arrow in Figure 4 corresponds to the corresponding block arrows in Figure 3aand is intended to symbolize once again the accessibility of the battery cell connecting elements 4, 4' from the outside, i.e. also through the battery cell connecting module 5 or the aforementioned openings 5ba, 5bb. Within the scope of the invention, it is possible to first arrange the battery cell connecting elements 4, 4' in or on the battery cell connecting module 5, to place the battery cell connecting arrangement thus created, comprising the battery cell connecting element 4, 4' and the battery cell connecting module 5, onto the battery cells 2 or the battery cell arrangement 1, and only finally to connect the individual battery cell connecting elements 4, 4' to the underlying cell conductors (not shown) of the battery cells 2, as already described in detail above. This enormously improves handling and ease of assembly.

[0097] In this context, it may also be provided to arrange the PCB 6 in the central recess 5a of the battery cell connection module 5 and to place it together with the latter on the battery cell arrangement 1. Advantageously, galvanic connections (in Figure 4 shown as an example at reference numeral 6b), which can electrically connect the PCB 6 or certain electronic components 6a to the battery cell connecting elements 4, 4' and, accordingly, the cell conductors (not shown) of the battery cells 2. In this way, the PCB 6 can be used, in particular, to implement a Battery Management System (BMS) without the need for subsequent, time-consuming and costly cabling for this purpose.

[0098] To prevent the tempering fluid from escaping from the Figure 4upwardly open fluid line sections 5b, 5b', the battery cell connection module 5 comprises Figure 5 another cover part 5h, which cover part 5h tightly closes at least the fluid line sections 5b, 5b', but not the central recess 5a, so that no tempering fluid can escape from the fluid line sections 5b, 5b' (cf. Figure 4 ) can escape. For this purpose, the aforementioned seals 5c, in particular, engage the cover part 5h from below. Like the rest of the battery cell connection module 5, the cover part 5h is preferably made of an electrically non-conductive, injection-moldable plastic.

[0099] The following Figures 6 and 7 The sectional views shown are along the dashed or dash-dotted line in Figure 5 Figure 6 shows a section approximately along the dashed line in Figure 5. The (material-locking) connection of the battery cell connecting elements 4 according to Figure 3awith the underlying cell conductors 3 of the battery cells 2. It is also clearly visible how the cover part 5h closes off or seals the individual fluid line sections 5b at the top. Reference numeral 5i denotes the already mentioned receptacles for the battery cell connecting elements 4, in particular in the area of the corrugated sections 4c. Reference numeral 5j denotes hold-down elements, which can be intended to bring the battery cell connecting elements 4 into defined contact with the cell conductors 3 before a material-to-material connection of the battery cell connecting elements 4 to the cell conductors 3 takes place. In certain embodiments, such a material-to-material connection may even be dispensable under certain circumstances if the battery cell connecting module 5 already ensures a sufficiently firm, permanent fixation of the battery cell connecting elements 4 to the cell conductors 3.

[0100] Figure 7shows a corresponding sectional view approximately along the dotted line in Figure 5 . In particular, the outlet for the tempering fluid can be seen here, see reference numeral 5e according to Figure 4 and 5 .

[0101] In Figure 8Above, an alternative battery cell connecting element 4" with open ends is shown in longitudinal section. The associated battery cell connecting module 5' has two (plastic) half-shells 5.1 (upper shell) and 5.2 (lower shell), and is therefore designed in two parts. The temperature control fluid then flows in the direction of the longitudinal axis, i.e. parallel to the plane of the drawing through the arrangement (arrow F). The cross-section is shown below. The battery cell connecting elements 4" are sandwiched between the upper shell 5.1 and the lower shell 5.2. For the tool for connecting the battery cell arresters, openings 4da, 4ea may also be present between the area 4c and the half-shells 5.1, 5.2, but are closed after assembly (by plugs or the like made of an elastic material, reference numeral 7).

[0102] A variant without openings is also possible; in this case, the battery cell arresters can be connected laterally using a fillet weld.

[0103] Figure 9 shows in perspective another embodiment of the battery cell arrangement 1 with a number of battery cell connecting elements 4", which are essentially according to Figure 8 are designed. Reference numeral 4‴ denotes shortened (halved) versions of these connecting elements (without bellows corrugations), each of which covers only one arrester 3. On both sides of the arrangement 1, the connecting elements 4", 4‴ are connected in a fluid-conducting manner by an electrically insulating line element 8 made of plastic being guided through all of the relevant connecting elements 4", 4‴. The respective free ends of the line elements 8 open on the end faces of the arrangement 1 into a collecting element 9 with a supply line 9a and an outlet line 9b (cf. Figure 4 and 5, there reference numerals 5d, 5e). Preferably, the connecting elements 4", 4‴ are first attached (welded), as previously described, and then lined with the line elements 8. Finally, the collecting elements 9 are attached. Corresponding openings in the connecting elements 4", 4‴ (cf. Figure 8 ) and in the line elements are closed together with plug 7, see also Figures 10 to 12 .

[0104] Figure 10 shows a longitudinal section through the arrangement 1 according to Figure 9 , approximately in the area of the dashed circle. Newly designated are Figure 10 adhesive shaft 4f, which runs around the connecting element 4" at the end and is filled with an adhesive and sealant (not shown), in order to connect the line element 8 to the connecting element 4" in a fluid-tight and materially bonded manner.

[0105] Figure 11 shows a cross section through the connecting element 4" in approximately the same area.

[0106] Figure 12 shows an alternative design, whereby the type of representation of the Figure 10 However, here the connecting element 4" does not have adhesive corrugations, but rather circumferential adhesive grooves or channels 8a are arranged on the line element 8, which serve the same purpose.

Claims

1. Battery cell connection element (4, 4') having a main body (44) in the form of a fluid conduit element made from an electrically conductive material with a longitudinal axis (L), which main body (44) is preferably closed at its two ends (4a, 4b), in particular in a fluid-tight manner, and has a peripherally substantially closed casing wall, in which casing wall at least two apertures (4da, 4ea), preferably punch-puts, are arranged on the same side of the main body (44), which apertures (4da, 4ea) are arranged next to one another and offset in the direction of the longitudinal axis (L), characterized in that the main body (44) is configured to be substantially flat in some sections, at least on its side opposite the apertures (4da, 4ea), so that flat sections (4d', 4e') of the main body (44) are in alignment with the apertures (4da, 4ea) in a direction perpendicular to the longitudinal axis (L), in which preferably the main body (44) has two substantially flat side walls (4d, 4e, 4d', 4e') arranged parallel to one another in some sections, in one of which the apertures (4da, 4ea) are arranged.

2. Battery cell connection element (4, 4') according to claim 1, in which the main body (44) has two essentially identical halves along its longitudinal axis (L) between which a central section (4c) with a modified shape is arranged, which central section (4c) preferably has at least one circumferential bellows shaft (4ca), most preferably a plurality of such bellows shafts (4ca), and is preferably formed in one piece with the rest of the main body (44).

3. Battery cell connection module (5) having at least two mounts (5i), which mounts (5i) are each configured to each receive a battery cell connection element (4, 4') according to any one of the preceding claims in a form-fitting and / or force-fitting manner, and a fluid conduit section (5b, 5b'), which fluid conduit section (5b, 5b') has a fluid feed line (5ba) and a fluid outlet line (5bb), in which at least the fluid conduit section (5b, 5b') is made from an electrically non-conductive material, preferably plastic, and in which the fluid feed line (5ba) and the fluid outlet line (5bb) are arranged relative to the mounts (5i) such that the fluid feed line (5ba) is in fluidic connection with one mount (5i) and the fluid outlet line (5bb) is in fluidic connection with the other mount (5i).

4. Battery cell connection module (5) according to claim 3 having a first number of more than two mounts (5i) and a second number of more than one fluid conduit section (5b, 5b'), in which each fluid conduit section (5b, 5b') always fluidically connects at least two mounts (5i), in which the fluid conduit sections (5b, 5b') and / or the mounts (5i) extend in or parallel to a common plane respectively and / or are arranged distributed around the circumference of a rectangle, and in which preferably a first fluid conduit section (5b') has a feed line (5d) for a temperature control fluid to the first fluid conduit section (5b') and a second fluid conduit section (5b') has an outlet line (5e) for a temperature control fluid from the second fluid conduit section (5b').

5. Battery cell connection module (5) according to claim 3 or 4, in which the fluid conduit section (5b, 5b') or the fluid conduit sections (5b, 5b') are open on a first side of the battery cell connection module (5) and in which the mounts (5i) are arranged on a second side of the battery cell connection module (5) facing away from the first side, and with at least one cover part (5h), which cover part (5h) closes the at least one fluid conduit section (5b, 5b'), preferably a plurality of fluid conduit sections (5b, 5b'), most preferably all fluid conduit sections (5b, 5b'), to the outside in a fluid-tight manner, wherein the cover part is preferably connected to the battery cell connection module (5) via a film hinge.

6. Battery cell connection module (5) according to any one of claims 3 to 5 having a further mount (5a) for receiving an electronic board (6), which further mount (5a) is preferably surrounded by the mounts (5i) for the battery cell connection elements (4, 4') and by the fluid conduit sections (5b, 5b') according to claim 5.

7. Battery cell connection module (5) according to claim 6, in which galvanic connections (6b) extend from the further mount (5a) to the mounts (5i) for the battery cell connection elements (4, 4'), which connections (6b) are preferably formed by printing, for example screen printing or pad printing, conductor tracks onto the battery cell connection module (5).

8. Battery cell connection arrangement having at least one first battery cell connection element (4, 4') according to claim 1 or 2, at least one second battery cell connection element (4, 4') according to claim 1 or 2 and at least one battery cell connection module (5) according to any one of claims 3 to 7, in which the first battery cell connection element (4, 4') and the second battery cell connection element (4, 4') are each arranged in a respective mount (5i), so that, on the one hand, the first battery cell connection element (4, 4') is in fluidic connection with one of its apertures (4da, 4ea) with the fluid feed line (5ba) and, on the other hand, the fluid outlet line (5bb) is in fluidic connection with one of the apertures (4da, 4ea) of the second battery cell connection element (4, 4'), or so that the two battery cell connection elements (4, 4') are in fluidic connection with one another via one of their apertures (4da, 4ea) and via the fluid conduit section (5b, 5b'), wherein in each case the two battery cell connection elements (4, 4') are spaced apart from one another.

9. Battery cell connection arrangement according to claim 8 having a battery cell connection module (5) according to claim 4, in which the battery cell connection elements (4, 4') and the fluid conduit sections (5b, 5b') together form a closed fluid circuit, preferably and with reference back to claim 5, together with the cover part (5h) and most preferably excluding the feed line (5d) and the outlet line (5e).

10. Battery cell connection arrangement according to claim 8 or 9 having battery cell connection module (5) according to claim 6 and an electronic board (6) accommodated in the further mount (5a), which electronic board (6) preferably has electronic components (6a) for controlling the operation of a battery cell arrangement (1) with a plurality of battery cells (2), in which most preferably the electronic board (6) and / or at least some of the electronic components (6a) electrically contact the battery cell connection elements (4, 4') via the galvanic connections (6b).

11. Battery cell arrangement (1) having a plurality of battery cells (2) and a battery cell connection arrangement according to any one of claims 8 to 10, in which the individual battery cells (2) each have a first cell arrester (3) with a first electrical polarity and a second cell arrester (3) with a second electrical polarity, in which the first cell arrester (3) of a battery cell (2) is connected electrically conductively to the second cell arrester (3) of another battery cell (2) via a battery cell connection element (4), in which the first battery cell connection element (4) is connected in a fluidic manner to the second battery cell connection element (4) via the fluid conduit section (5b), and in which preferably the battery cell connection elements (4, 4') are connected to the cell arresters (3) in a materially-bonded manner.

12. Battery cell arrangement (1) according to claim 11, in which the battery cell connection elements (4, 4') and the fluid conduit section (5b, 5b') or the fluid conduit sections (5b, 5b') are filled with a temperature control fluid or are flowed through by a temperature control fluid.

13. Method for controlling the temperature and for electrically contacting battery cells (2) of a battery cell arrangement (1), including: a) providing battery cell connection elements (4, 4') according to claim 1 or 2; b) providing a battery cell connection module (5) according to any one of claims 3 to 7; c) arranging the battery cell connection elements (4, 4') in the battery cell connection module (5) to create a battery cell connection arrangement according to any one of claims 8 to 10; d) manufacturing the battery cell arrangement (1) according to claim 11 or 12 by attaching the battery cell connection arrangement on an arrangement of battery cells (2) and electrically connecting the battery cell connection elements (4, 4') to the cell arresters (3), preferably in a materially-bonded manner; e) flowing a temperature control fluid through the battery cell connection elements (4, 4') and the fluid conduit section (5b, 5b') or the fluid conduit sections (5b, 5b'); and f) electrically contacting the battery cells (2) via the battery cell connection elements (4, 4').

14. Method according to claim 13, in which in step d) the battery cell connection elements (4, 4') are connected, preferably welded, to the cell arresters (3) from the outside through the fluid feed line (5ba) or the fluid outlet line (5bb) and via the respective apertures (4da, 4ea), and in which, subsequently, before step e), the cover part (5h) according to claim 5 is fitted to close the battery cell connection arrangement.