Battery busbar system and electrical energy storage for an electric vehicle

Abstract

The invention relates to a battery busbar system (15) and an electrical energy storage device (10) with the battery busbar system (15) for an electric vehicle, wherein the battery busbar system (15) comprises a printed circuit board arrangement (55) and a cell connector arrangement (46), wherein the printed circuit board arrangement (55) comprises at least a first flexible printed circuit board (75) and a second flexible printed circuit board (80), wherein the cell connector arrangement (46) comprises at least a first cell connector (45) and a second cell connector (50) arranged offset from the first cell connector (45), wherein the first cell connector (45) is electrically connectable to at least one first energy storage cell (25) of an energy storage cell arrangement (20) of the electrical energy storage device (10) and the second cell connector (50) is electrically connectable to at least one second energy storage cell (30) of the energy storage cell arrangement (20) of the electrical energy storage device (10).wherein the first cell connector (45) is electrically and mechanically connected to the first flexible printed circuit board (75) and the second cell connector (50) is connected to the second flexible printed circuit board (80), wherein the first flexible printed circuit board (75) and the second flexible printed circuit board (80) are arranged at least sectionally in a stack.

Description

[0001] The invention relates to a battery busbar system according to claim 1 and an electrical energy storage device according to claim 10.

[0002] Electrical energy storage systems for electric vehicles are known. Many of these systems use so-called cylindrical cells to store electrical energy. The cylindrical cells are electrically connected via cell connectors. Monitoring is performed by a battery management system, which is electrically connected to the cylindrical cells via a battery busbar system and a circuit board to measure the cell voltage.

[0003] The object of the invention is to provide an improved battery busbar system and an improved electrical energy storage system.

[0004] This problem is solved by means of a battery busbar system according to claim 1, and by means of an electrical energy storage device according to claim 10. Advantageous embodiments are specified in the dependent claims.

[0005] It was recognized that an improved battery busbar system for a vehicle's electrical energy storage system can be provided by comprising a printed circuit board assembly and a cell connector assembly. The printed circuit board assembly includes at least one first flexible printed circuit board and one second flexible printed circuit board. The cell connector assembly includes at least one first cell connector and a second cell connector arranged offset from the first cell connector. The first cell connector is electrically connectable to at least one first energy storage cell of an energy storage cell assembly of the electrical energy storage system, and the second cell connector is electrically connectable to at least one second energy storage cell of the energy storage cell assembly of the electrical energy storage system.The first cell connector is electrically and mechanically connected to the first flexible printed circuit board, and the second cell connector is connected to the second flexible printed circuit board. The first and second flexible printed circuit boards are arranged, at least partially, in a stack.

[0006] This design has the advantage that the battery busbar system can also be designed in very confined installation spaces and can provide sufficient information through the flexible printed circuit boards arranged one above the other in a stack to supply a battery management system of the electrical energy storage with enough information about the operating parameters of the electrical energy storage.

[0007] The first and second flexible printed circuit boards (PCBs) arranged in the stack can be designed particularly simply, often with only one or two layers, thanks to the stacked arrangement. This results in very low manufacturing costs for both PCBs. Furthermore, the stacked arrangement of flexible PCBs enables a modular design for the battery busbar system. This modular design allows the number of electrical energy storage cells contacted by the battery busbar system to be varied depending on the number of flexible PCBs used.

[0008] In a further embodiment, the first flexible printed circuit board has a first base section and the second flexible printed circuit board has a second base section. The first base section and the second base section each extend along a first axis. The first base section also extends substantially parallel to the second base section. This design has the advantage that the base section can be guided, particularly in a stack with the second base section. In particular, the first base section and the second base section can be formed with identical widths in a direction perpendicular to the first axis, so that the installation space required for the first and second base sections is particularly small.

[0009] It is particularly advantageous if a gap is arranged between the first and second base sections. This design has the advantage that unwanted rubbing, for example caused by vibrations in the electric vehicle, between the first and second base sections can be prevented by the gap. The circuit board arrangement can be made particularly flat by having the first and second base sections lie directly against each other, but be able to slide relative to one another.

[0010] In a further embodiment, the first flexible printed circuit board has a first arm arrangement with at least one first contact arm, and the second flexible printed circuit board has a second arm arrangement with at least one second contact arm. The first contact arm adjoins the first base section and extends between the first base section and the first cell connector, connecting the first cell connector to the first base section. The second contact arm adjoins the second base section and extends between the second base section and the second cell connector, connecting the second cell connector to the second base section. The second contact arm is arranged offset along the first axis relative to the first contact arm.This design has the advantage that the contact arms allow the electrical energy storage devices to move along the first axis without deforming the base section in each instance.

[0011] This allows thermal tolerances to be compensated for by means of the contact arm. The offset of the first and second contact arms makes it possible to contact different electrical energy storage cells via the plate element.

[0012] In a further embodiment, the first arm arrangement comprises at least two first contact arms arranged offset along the first axis, each connected at its first fixed end to the first base section. The second contact arm is arranged between the two first contact arms along the first axis. The alternating arrangement of the first and second contact arms allows for a particularly close longitudinal connection to different cell connectors.

[0013] In a further embodiment, the first flexible printed circuit board (PCB) has a first mounting section and the second flexible PCB has a second mounting section. The first mounting section is tab-shaped and has a first mounting receptacle, being attached to the first base section at a second fixed end and extending away from the first base section. The second mounting section is tab-shaped and has a second mounting receptacle. The second mounting section is attached to the second base section at a fifth fixed end and extends away from the second base section. The first mounting receptacle and the second mounting receptacle are arranged overlapping. This overlapping arrangement allows the first flexible PCB and the second flexible PCB to be connected to each other.In particular, the first and second mounting points can, for example, guide a fastening element, such as a carrier for the battery busbar system. Furthermore, the aligned and overlapping arrangement of the first and second mounting points facilitates the alignment of the first and second flexible printed circuit boards relative to each other. Additionally, the two mounting sections allow the two circuit boards to be connected for transport.

[0014] In a further embodiment, the battery busbar system has a fastening element, wherein the fastening element extends through and connects the first and second mounting receptacles. This ensures the defined orientation of the first and second flexible circuit boards even during transport of the circuit board assembly. In particular, this prevents unwanted mechanical stress on a contact element to which, for example, the first and second base sections are connected.

[0015] In another embodiment, the battery busbar system has a carrier, wherein the first flexible circuit board and the second flexible circuit board are attached to the carrier within the stack. This ensures a secure hold for the first and second flexible circuit boards. It also prevents the two flexible circuit boards from unintentionally slipping relative to each other.

[0016] In a further embodiment, the first flexible printed circuit board (PCB) has a first alignment section and the second flexible PCB has a second alignment section, wherein the first alignment section is tab-shaped and has a first alignment receptacle. The first alignment section is attached to the first base section at a third fixed end and extends away from the first base section. The second alignment section is tab-shaped and has a second alignment receptacle, wherein the second alignment section is attached to the second base section at a sixth fixed end and extends away from the second base section. The overlapping alignment sections ensure a defined orientation of the first flexible PCB and the second flexible PCB.

[0017] It was recognized that an improved electrical energy storage system for an electric vehicle can be provided by an electrical energy storage system comprising an energy storage cell arrangement and a battery busbar system as described above. The energy storage cell arrangement includes at least one first energy storage cell and a second energy storage cell arranged offset from the first. The first plate element is electrically and mechanically connected to a first terminal of the first energy storage cell, and the second plate element is connected to a third terminal of the second energy storage cell.The use of the battery busbar system has the advantage that accessibility to the energy storage cells, for example from above on the side facing the battery busbar system, is ensured, and thus the covering or overlapping of the electrical energy storage cells in particular by the flexible circuit boards arranged in the stack can be kept to a minimum.

[0018] In a further embodiment, the first terminal and the third terminal are arranged in a common third plane, wherein the first flexible circuit board and the second flexible circuit board extend at least partially parallel to the third plane. This allows the battery busbar system to be arranged flat on the energy storage cell arrangement.

[0019] The invention is explained in more detail below with the aid of figures. These show: Fig. 1 a section of a top view of an electrical energy storage device of an electric vehicle with a battery busbar system according to a first embodiment; Fig. 2 a top view of the battery busbar system of the in Fig. 1 electrical energy storage device shown; Fig. 3 a top view of a first flexible printed circuit board of the in Fig. 1 and Fig. 2 battery busbar systems shown; Fig. 4. A top view of a second flexible circuit board of the one in the Fig. 1 and Fig. 2 battery busbar systems shown; Fig. 5 a side view of a printed circuit board arrangement of the in the Fig. 1, Fig. 2, Fig. 3 to Fig. 4 battery busbar systems shown; Fig. 6 a sectional view along a Fig. Section plane AA shown in 5 through the in Fig. 5 battery busbar systems shown; Fig. 7 a section of a top view of a battery busbar system according to a second embodiment.

[0020] The following figures refer to a coordinate system for ease of understanding. This coordinate system has an x-axis (longitudinal direction), a y-axis (transverse direction), and a z-axis (height direction). The coordinate system can be right-handed.

[0021] Fig. Figure 1 shows a section of a top view of an electrical energy storage device 10 of an electric vehicle with a battery busbar system 15 according to a first embodiment.

[0022] The electrical energy storage device 10 comprises a battery busbar system 15 and an energy storage cell arrangement 20. The energy storage cell arrangement 20 preferably comprises a plurality of electrical energy storage cells 25, 30. In this embodiment, the energy storage cells 25, 30 are, for example, arranged in a close packing arrangement and are, for example, designed as cylindrical cells. The arrangement has such a high packing density that the energy storage cells 25, 30 are arranged close to each other, preferably in direct contact with each other.

[0023] The energy storage cell 25, 30 can, for example, be configured as a lithium-ion cell, a lithium iron phosphate cell, or a supercapacitor. Of course, it is also possible for the energy storage cell 25, 30 to have a different configuration. It is also possible that, instead of the cylindrical shape, the energy storage cell 25, 30 has a different geometric form. In particular, it is possible, for example, for the energy storage cell 25, 30 to be prismatic or pouch-shaped.

[0024] In this embodiment, the electrical energy storage device 10 is configured, for example, as a traction battery for an electric vehicle, in particular a fully electric vehicle or a hybrid vehicle. Of course, it is also possible for the electrical energy storage device 10 to be configured as a supply battery, for example, for storing electrical energy in a building.

[0025] The energy storage cell arrangement 20 comprises a plurality of electrical energy storage cells 25, 30. For the sake of clarity, only a first energy storage cell 25 and an exemplary second energy storage cell 30 are discussed. The first and second energy storage cells 25, 30 are identical in design. This also applies to the other energy storage cells 25, 30.

[0026] The first energy storage cell 25 extends along the z-axis and has a first terminal pole 35 and a second terminal pole located on a side facing away from the viewer.

[0027] The second energy storage cell 30 has a third terminal 40, which is located on the side of the second energy storage cell 30 facing the viewer. Furthermore, the second energy storage cell 30 has a fourth terminal, which is located on a side facing away from the viewer and is therefore concealed from the viewer.

[0028] The energy storage cells 25, 30 are electrically connected to each other at the first terminal 35 to the fourth terminal 40 in order to discharge or charge the energy storage cell 25, 30.

[0029] The battery busbar system 15 is arranged on the energy storage cell arrangement 20. The battery busbar system 15 comprises a cell connector arrangement 46 with at least one first cell connector 45 and at least one second cell connector 50, a printed circuit board arrangement 55, a contact device 60, and preferably a carrier 70. The first cell connector 45 and / or the second cell connector 50 can also be referred to as a busbar.

[0030] The contact device 60 is connected to the circuit board assembly 55 and can be connected to a battery management system via data transmission. The battery busbar system 15 provides information at the contact device 60 about at least one operating state of the electrical energy storage device 10, in particular about the energy storage cell assembly 20 and its energy storage cells 25, 30. This information can, for example, include information about the battery voltage of the energy storage cells 25, 30 and / or the temperature of the respective energy storage cells 25, 30.

[0031] In this embodiment, the first cell connector 45 contacts several first terminals 35 of the first energy storage cells 25, so that the several first energy storage cells 25 are connected in parallel by means of the first cell connector 45. In this embodiment, the second cell connector 50 of the cell connector arrangement 46 contacts third terminals 40 of the several second energy storage cells 30, so that the second energy storage cells 30 are, for example, connected in parallel.

[0032] In this embodiment, the first cell connector 45 and the second cell connector 50 are, for example, made of sheet metal material, so that the first energy storage cells 25 are electrically connected to each other in a simple power electrical manner by means of the first cell connector 45 and the second energy storage cells 30 are electrically connected to each other by means of the second cell connector 50.

[0033] It should be noted that the energy storage cells 25, 30 can of course also be interconnected in other ways. In particular, it is conceivable that the energy storage cells 25, 30 can be electrically interconnected in series or in series-parallel. The cell connector arrangement 46 is designed accordingly for this purpose.

[0034] In this embodiment, for example, the cell connector 45, 50 is designed in a strip shape and extends essentially in an xy-plane.

[0035] The circuit board arrangement 55 is arranged on one side of the cell connector arrangement 46 facing away from the energy storage cell arrangement 20.

[0036] In this embodiment, it must be ensured that the printed circuit board assembly 55 requires particularly little installation space, especially in the y-direction, and is therefore designed to be particularly slim. This is especially necessary to allow safe access to, for example, the first and third terminals 35, 40, in order to connect the respective cell connectors 45, 50 to their respective terminals 35, 40, for example, by means of a spot welding process.

[0037] The support 70 can, for example, be arranged between the printed circuit board assembly 55 and the cell connector assembly 46. The support 70 can, for example, be made of an electrically non-conductive material. The support 70 serves to fasten the printed circuit board assembly 55 and preferably the cell connector assembly 46.

[0038] Fig. Figure 2 shows a top view of the battery busbar system 15 of the in Fig. 1 shown electrical energy storage device 10, with reference to the representation of the cell connector arrangement 46 in Fig. 2 is waived.

[0039] The printed circuit board arrangement 55 of the battery busbar system 15 comprises at least one first flexible printed circuit board 75 and a second flexible printed circuit board 80 arranged directly below the first flexible printed circuit board 75 in the z-direction. The second flexible printed circuit board 80 is in Fig. 2 is essentially concealed by the first flexible printed circuit board 75. The second flexible printed circuit board 80 is, for example, arranged on a side facing the energy storage cell arrangement 20, and the first flexible printed circuit board 75 is arranged on a side facing away from the energy storage cell arrangement 20. The first flexible printed circuit board 75 and the second flexible printed circuit board 80 are preferably arranged in a stack one above the other.

[0040] Furthermore, the first and second flexible printed circuit boards 75, 80 arranged in the stack can each be designed as a single layer. This allows the flexible printed circuit board 75, 80 to be adapted particularly flexibly and easily to the configuration of the energy storage cell arrangement 20. Alternatively, it is of course also possible for the first and second flexible printed circuit boards 75, 80 to be designed as multilayers, in particular as two layers, with each layer having its assigned conductor track 120, 175.

[0041] The first flexible printed circuit board 75 has a first base section 85. The first base section 85 extends, for example, along the x-axis essentially in a first plane 210, which is configured, for example, as an xy-plane. The first base section 85 can be in a strip-like form.

[0042] Furthermore, the first flexible printed circuit board 75 has a first arm arrangement 90 with at least one first contact arm 95. Fig. Figure 2 shows, for example, two contact arms 95 of the first arm arrangement 90, wherein the two first contact arms 95 are arranged offset from each other in the x-direction.

[0043] Each first contact arm 95 is laterally connected to the first base section 85 at a first fixed end 100. In the transverse direction, for example, the two first contact arms 95 can each be connected to the first fixed end 100 on the same transverse side of the first base section 85. Of course, it is also possible for the first contact arms 95 to be arranged opposite each other in the transverse direction and / or on both sides of the first base section 85.

[0044] The first cell connector 45 further comprises at least one first plate element 110, and the second cell connector 50 preferably comprises at least one second plate element 115. The first plate element 110, for example, has a plate-shaped design. The plate element 110, 115 can, for example, predominantly comprise nickel as the material.

[0045] The first plate element 110 has a first printed circuit board connection section 111 and a first cell connector connection section 112, which is located opposite each other in Fig. 2, for example, is arranged transversely to the first circuit board connection section 111. The first circuit board connection section 111 is connected to the first cell connector connection section 112.

[0046] The second plate element 115 has a second printed circuit board connection section 116 and a second cell connector connection section 117, which is located opposite in Fig. 2, for example, is arranged transversely to the second circuit board connection section 116. The second circuit board connection section 116 is connected to the second cell connector connection section 117.

[0047] In this embodiment, for example, the first plate element 110 is arranged transversely between the first cell connector 45 and the first contact arm 95. The first plate element 110 is electrically and mechanically connected to a first free end 105 of the first contact arm 95 via the first circuit board connection section 111, and to the first cell connector 45 via the first cell connector connection section 112. The first plate element 110 electrically connects the first contact arm 95 to the first cell connector 45.

[0048] The first flexible printed circuit board 75 has at least one first conductor track 120, the first conductor track 120 extending over the first contact arm 95 and the first base section 85 and up to the contact device 60. The first conductor track 120 thus connects the contact device 60 electrically to the first cell connector 45 and thus to the first electrical energy storage cell 25 via the first plate element 110.

[0049] Fig. Figure 3 shows a top view of the first flexible printed circuit board of the in Fig. 1 and Fig. 2 battery busbar system 15 shown and the first plate elements 110 arranged on the first flexible printed circuit board 75.

[0050] Additionally, the first flexible printed circuit board 75 can, for example, have a first mounting section 125 and a first alignment section 130. In this embodiment, the first mounting section 125 and / or the first alignment section 130 are tab-shaped. The first mounting section 125 is, for example, attached to the first base section 85 by a second fixed end 135 and extends, for example, transversely from the first base section 85. The first mounting section 125 is electrically isolated from the first conductor track 120. An electrically conductive layer in the first mounting section 125 can be omitted, for example. Of course, it is also possible to include conductive material in the first mounting section 125.

[0051] The first fastening section 125 further comprises a first fastening receptacle 140, wherein the first fastening receptacle 140 is designed as a through-opening which extends, for example, completely through the first fastening section 125 in the z-direction.

[0052] In this embodiment, for example, the first fastening section 125 is arranged in the transverse direction on the side opposite the first contact arm 95. Furthermore, in the longitudinal direction, the first fastening section 125 is arranged between the two first contact arms 95 of the first arm arrangement 90.

[0053] The alignment section 130 can be arranged opposite the first mounting section 125 in the transverse direction and, for example, at the same height in the longitudinal direction on the first base section 85, wherein the first alignment section 130, for example, has a first alignment receptacle 145, which in this embodiment is arranged, for example, as a through-opening in the first alignment section 130. The first alignment section 130 is also electrically separated from the first conductor track 120; in particular, electrically conductive material in the alignment section 130 can be omitted.

[0054] The first alignment section 130, for example, is tab-shaped and connects to the first base section 85 with a third fixed end 149, extending from the third fixed end 149 away from the first base section 85, for example, in a transverse direction. In the longitudinal direction, the first alignment section 130 can also be arranged between two first contact arms 95 and spaced apart from the two first contact arms 95.

[0055] Fig. Figure 4 shows a top view of the second flexible printed circuit board 80 of the [unclear text] in the Fig. 1 and Fig. 2 shown battery busbar system 15.

[0056] The second flexible printed circuit board 80 has a second base section 150 and a second arm arrangement 155. The second base section 150 extends substantially along the x-axis and is arranged in the z-direction below the first base section 85 when the battery busbar system 15 is assembled. The second base section 150 can have substantially the same transverse extent as the first base section 85 and can be aligned parallel to the first base section 85.

[0057] The second arm arrangement 155 has at least one second contact arm 160. In this embodiment, several second contact arms 160 are provided, each arranged at a fourth fixed end 165 on the second base section 150, offset from one another in the x-direction. The second contact arms 160 extend from the fourth fixed end 165 away from the second base section 150 in the same transverse direction. The number of second contact arms 160 can differ from the number of first contact arms 95.

[0058] At each of its second free ends 170, the second contact arm 160 is electrically and mechanically connected, for example by soldering, to an associated second circuit board termination section 116 of the second plate element 115. The second plate element 115 is in turn connected on a transverse side facing away from the second contact arm 160 to the second cell connector connection section 117 with the associated second cell connector 50 (in Fig. 4 (not shown) electrically and mechanically connected, for example by material bonding, for example by welding or soldering.

[0059] The second flexible printed circuit board 80 has at least one second conductor track 175, the second conductor track 175 extending over the second contact arm 160 and the second base section 150 towards the contact device 60. The second conductor track 175 electrically connects the contact device 60 to the associated second board element 115. The second conductor tracks 175 can be arranged parallel to each other in a transverse direction within the second base section 150.

[0060] Furthermore, analogous to the first flexible printed circuit board 75, the second flexible printed circuit board 80 can have a second mounting section 180 and / or a second alignment section 185. The second mounting section 180 can, for example, be identical to the first mounting section 125.

[0061] The second mounting section 180 can be connected to the second base section 150 by a fifth fixed end 181 on the side of the second base section 150 opposite the second contact arms 160 in the transverse direction and extend away from the second base section 150 in the transverse direction. The second mounting section 180 has a second mounting receptacle 182, which preferably extends completely through the second mounting section 180 in the z-direction. The second mounting receptacle 182 can be geometrically identical to the first mounting receptacle 140.

[0062] The second alignment section 185 can be arranged on the second base section 150, opposite the second mounting section 180 in the transverse direction and, for example, at the same height in the x-direction. The second alignment section 185 is, for example, tab-shaped and extends from a sixth fixed end 191 away from the second base section 150. The second alignment section 185 is attached to the second base section 150 at the sixth fixed end 191.

[0063] The second alignment section 185 has a second alignment receptacle 190, which preferably extends completely through the second alignment section 185 in the z-direction. Both the second mounting section 180 and the second alignment section 185 can be formed from substrate material of the second flexible printed circuit board 80. Furthermore, the second alignment section 185 and / or the second mounting section 180 are electrically isolated from the second conductor track 175.

[0064] The second alignment receptacle 190 can preferably be identical to the first alignment receptacle 145. In this embodiment, for example, the second alignment section 185 is arranged between two second contact arms 160.

[0065] When the first circuit board 75 and the second circuit board 80 are stacked one above the other in the z-direction, the first mounting receptacle 140 and the second mounting receptacle 182 are (see figure). Fig. 2) aligned with each other. A fastening element 195 of the carrier 70 can extend through the first mounting receptacle 140 and the second mounting receptacle 182 and fasten the first and second flexible printed circuit boards 75, 80 to the carrier 70, preferably at a defined distance from each other.

[0066] Furthermore, an alignment element 200 (see Fig. 2) The first alignment receptacle 145 and the second alignment receptacle 190 extend through in the z-direction. The alignment element 200 serves to fasten the first and second flexible printed circuit boards 75, 80 to each other during transport and, when mounted on the carrier 70, to align the first and second flexible printed circuit boards 75, 80 in both the x- and y-directions and around the z-axis, so that the first and second flexible printed circuit boards 75, 80 are arranged one above the other in the stack. The alignment element 200 can be designed as a separate component from the carrier 70 or as part of the carrier 70.

[0067] Fig. 5 shows a side view of the [unclear] in the Fig. 1, Fig. 2, Fig. 3 to Fig. 4 battery busbar systems shown 15.

[0068] It is clear in Fig. Figure 5 shows the offset in the z-direction of the first and second flexible printed circuit boards 75, 80. In this embodiment, for example, the support 70 can be arranged in the z-direction between the energy storage cell arrangement 20 and the first and second flexible printed circuit boards 75, 80. In the z-direction, the support 70 is positioned above the energy storage cell arrangement 20 and below the printed circuit board arrangement 55. Furthermore, the second flexible printed circuit board 80 is arranged first above the support 70. The fastening element 195 allows the first flexible printed circuit board 75 to be positioned above the second flexible printed circuit board 80, separated from it by a gap 205. The gap 205 between the first flexible printed circuit board 75 and the second flexible printed circuit board 80 prevents the first flexible printed circuit board 75 from rubbing against the second flexible printed circuit board 80.

[0069] In this embodiment, the first base section 85 extends in a first plane 210, which is configured, for example, as an xy plane. The second base section 150 extends in a second plane 215, which is aligned parallel to the first plane 210. The terminal poles 35, 40 of the energy storage cells 25, 30 can, for example, each be arranged in a third plane 220, wherein the third plane 220 is also aligned parallel to the first and second planes 210, 215.

[0070] Fig. Figure 6 shows a sectional view along a [unclear] in Fig. Section plane AA shown in 5 through the in Fig. 5 shown battery busbar system 15.

[0071] The first contact arm 95 can have an S- or Z-shaped profile in cross-section, with the first contact arm 95 projecting in the z-direction from the first plane 210, in which the first base section 85 is arranged. For example, the first contact arm 95 projects with its first free end 105 on a side facing away from the electrical energy storage device 10. The first plate element 110 can then electrically contact the first conductor track 120 on the upper side of the first contact arm 95 with the first circuit board connection section 111.

[0072] In the z-direction towards the energy storage cell arrangement 20, the second flexible circuit board 80 is arranged starting from the first flexible circuit board 75. It is clearly visible in Fig. 6 the gap 205 between the first flexible circuit board 75 and the second flexible circuit board 80 can be seen.

[0073] For example, the second contact arm 160 also protrudes from the second plane 215, in which the second base section 150 extends. The second plate element 115 can be electrically and mechanically connected to the second contact arm 160 on its upper side. The second contact arm 160 can be S-shaped or Z-shaped in the section plane AA.

[0074] The above-described configuration of the battery busbar system 15 has the advantage that the base section 85, 150 of the flexible printed circuit boards 75, 80 can be particularly narrow in the transverse direction. This provides good accessibility in the z-direction from above to a large proportion of the electrical energy storage cells 25, 30 and to the cell connectors 45, 50, so that even with tight installation space requirements, especially in the transverse direction, a reliable connection of the respective connected electrical energy storage cells 25, 30 is ensured by the stacked flexible printed circuit boards 75, 80.

[0075] The flexible circuit boards 75, 80 arranged in the stack allow, for example, voltage taps to be made via the first and second conductor tracks 120, 175, which can be evaluated by the battery management system via the contact device 60.

[0076] Furthermore, the longitudinal offset of the contact arms 95, 160 offers the possibility of contacting individual rows of energy storage cells 25, 30, which are connected in parallel by the cell connector 45, 50, wherein a first part of the cell connectors 45, 50 is electrically connected to the contact device 60 via the first flexible circuit board 75 and a second part of the cell connectors 45, 50 is electrically connected to the contact device 60 by means of the second flexible circuit board 80.

[0077] Furthermore, the design described above ensures that the battery busbar system 15 can be manufactured particularly easily and cost-effectively. In particular, the first and second plate elements 110, 115 can be identical.

[0078] Furthermore, the energy storage cell arrangement 20 can have a particularly large number of electrical energy storage cells 25, 30. Additionally, for example, another flexible printed circuit board can be arranged on the stack of flexible printed circuit boards 75, 80 to contact the energy storage cells 25, 30 of the energy storage cell arrangement 20 and to provide a corresponding voltage signal at the contact device 60.

[0079] Fig. Figure 7 shows a section of a top view of a battery busbar system 15 according to a second embodiment.

[0080] The battery busbar system 15 is essentially identical to the one in the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 to Fig. The battery busbar system 15 shown in section 6 is designed. The following only refers to the differences of the system shown in the following. Fig. 7 battery busbar system 15 according to the second embodiment compared to the one shown in the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 to Fig. 6 battery busbar system 15 shown according to the first embodiment.

[0081] In the exemplary embodiment, the first flexible circuit board 75, which is arranged on a side facing away from the energy storage cell arrangement 20, is, for example, shortened in the longitudinal direction compared to the second flexible circuit board 80.

[0082] In the embodiment, for example, one of the two cell connectors 45, 50 has in Fig. 7 for example the second cell connector 50, a third plate element 225.

[0083] The third plate element 225 is essentially a combination of the first plate element 110 and the second plate element 115. The third plate element 225 has both the first printed circuit board connection section 111 and the second printed circuit board connection section 116. The first printed circuit board connection section 111 and the second printed circuit board connection section are arranged longitudinally offset from each other. The first contact arm 95 is electrically connected to the first printed circuit board connection section 111. The second contact arm 160 is electrically connected to the second printed circuit board connection section 116.

[0084] In the Fig. In the top view of the third plate element 225 shown in Figure 7, the third plate element 225 is V-shaped. The third plate element 225 has either the Fig. 7 shown second cell connector connection section 117 or the first cell connector connection section 112. In Fig. 7 the third plate element 225 is in electrical contact with the second cell connector connection section 117 and the second cell connector 50.

[0085] Alternatively, it is also possible that the third plate element with the first cell connector connection section 112 (instead of the second cell connector connection section 117) electrically contacts the first cell connector 45.

[0086] The in Fig. The embodiment shown in Figure 7 has the advantage that the first flexible circuit board 75 can be made shorter and the first conductor track 120 of the first flexible circuit board 75 can be electrically connected to the second conductor track 175 and the respective cell connector 45, 50 by means of the third plate element 225. Reference symbol list 10 electrical energy storage devices 15 Battery busbar system 20 Energy storage cell arrangement 25 first energy storage cell 30 second energy storage cell 35 first terminal (of the first energy storage cell) 40 third terminal (of the second energy storage cell) 45 first cell connector 46 cell connector arrangement 50 second cell connectors 55 Printed circuit board arrangement 60 Contact device 65 Plate element arrangement 70 carriers 75 first flexible printed circuit board 80 second flexible printed circuit board 85 first basic section 90 first arm arrangement 95 first contact arm 100 first fixed end (of the first contact arm) 105 first free end (of the first contact arm) 110 first plate element 111 first circuit board connection section 112 first cell connector connection section 115 second plate element 116 second circuit board connection section 117 second cell connector connection section 120 first conductor track 125 first fastening section 130 first alignment section 135 second fixed end (of the first fastening section) 140 first mounting point 145 first alignment recording 149 third fixed end (of the first alignment section) 150 second base section 155 second arm arrangement 160 second contact arm 165 fourth fixed end (of the second contact arm) 170 second free end (of the second contact arm) 175 second conductor track 180 second fastening section 181 fifth fixed end (of the second fortification section) 182 second mounting point 185 second alignment section 191 sixth fixed end (of the second alignment section) 190 second alignment recording 195 Fastening element 200 alignment elements 205 gap 210 first level 215 second level 220 third level 225 third plate element

Claims

[1] Battery busbar system (15) for an electrical energy storage device (10) of a vehicle, - wherein the battery busbar system (15) comprises a printed circuit board assembly (55) and a cell connector assembly (46), - wherein the printed circuit board arrangement (55) comprises at least a first flexible printed circuit board (75) and a second flexible printed circuit board (80), - wherein the cell connector arrangement (46) comprises at least one first cell connector (45) and a second cell connector (50) arranged offset from the first cell connector (45), - wherein the first cell connector (45) is electrically connectable to at least one first energy storage cell (25) of an energy storage cell arrangement (20) of the electrical energy storage device (10) and the second cell connector (50) is electrically connectable to at least one second energy storage cell (30) of the energy storage cell arrangement (20) of the electrical energy storage device (10), - wherein the first cell connector (45) is electrically and mechanically connected to the first flexible printed circuit board (75) and the second cell connector (50) is electrically and mechanically connected to the second flexible printed circuit board (80), - wherein the first flexible printed circuit board (75) and the second flexible printed circuit board (80) are arranged at least section by section in a stack. [2] Battery busbar system (15) according to claim 1, - wherein the first flexible printed circuit board (75) has a first base section (85) and the second flexible printed circuit board (75) has a second base section (150), - wherein the first base section (85) and the second base section (150) each extend along a first axis (x), - wherein the first base section (85) extends essentially parallel to the second base section (150). [3] Battery busbar system (15) according to claim 2, - wherein a gap (205) is arranged between the first base section (85) and the second base section (150), - or - where the first base section (85) is directly adjacent to the second base section (150). [4] Battery busbar system (15) according to claim 2 or 3, - wherein the first flexible printed circuit board (75) has a first arm arrangement (90) with at least one first contact arm (95) and the second flexible printed circuit board (80) has a second arm arrangement (155) with at least one second contact arm (160), - wherein the first contact arm (95) connects to the first base section (85) and extends between the first base section (85) and the first cell connector (45), - wherein the first contact arm (95) connects the first cell connector (45) to the first base section (85), - wherein the second contact arm (160) connects to the second base section (150) and extends between the second base section (150) and the second cell connector (50), - wherein the second contact arm (160) connects the second cell connector (50) to the second base section (150), - wherein the second contact arm (160) is arranged offset along the first axis (x) to the first contact arm (95). [5] Battery busbar system (15) according to claim 4, - wherein the first arm arrangement (90) has at least two first contact arms (95) arranged offset along the first axis (x), each of which is connected to the first fixed end (100) on the first base section (85), - wherein the second contact arm (150) is arranged between the two first contact arms (95) along the first axis. [6] Battery busbar system (15) according to any one of claims 2 to 5, - wherein the first flexible printed circuit board (75) has a first mounting section (125) and the second flexible printed circuit board (80) has a second mounting section (180), - wherein the first fastening section (125) is designed in a tab shape and has a first fastening receptacle (140), - wherein the first fastening section (125) is attached to the first base section (85) and extends away from the first base section (85), - wherein the second fastening section (180) is designed in a tab shape and has a second fastening receptacle (182), - wherein the second fastening section (180) is attached to the second base section (150) and extends away from the second base section (150), - wherein the first mounting receptacle (140) and the second mounting receptacle (182) are arranged overlapping. [7] Battery busbar system (15) according to claim 6, - having a fastening element (195), - wherein the fastening element (195) passes through and connects the first fastening receptacle (140) and the second fastening receptacle (182). [8] Battery busbar system (15) according to any one of the preceding claims, - having a support (70), - wherein the first flexible printed circuit board (75) and the second flexible printed circuit board (80) are attached to the carrier (70) in the stack. [9] Battery busbar system (15) according to any one of claims 2 to 8, - wherein the first flexible printed circuit board (75) has a first alignment section (130) and the second flexible printed circuit board (80) has a second alignment section (185), - wherein the first alignment section (130) is designed in a tab shape and has a first alignment receptacle (145), - wherein the first alignment section (130) is attached to the first base section (85) and extends away from the first base section (85), - wherein the second alignment section (185) is designed in a tab shape and has a second alignment receptacle (190), - wherein the second alignment section (185) is attached to the second base section (150) and extends away from the second base section (150), - wherein the first alignment mount (145) and the second alignment mount (190) are arranged overlapping. [10] Electrical energy storage device (10) for an electric vehicle, - wherein the electrical energy storage device (10) comprises an energy storage cell arrangement (20) and a battery busbar system (15) according to any of the preceding claims, - wherein the energy storage cell arrangement (20) comprises at least a first energy storage cell (25) and a second energy storage cell (30) arranged offset from the first energy storage cell (25), - wherein the first cell connector (45) is electrically and mechanically connected to a first terminal (35) of the first energy storage cell (25) and the second cell connector (50) is electrically and mechanically connected to a third terminal (40) of the second energy storage cell (30). [11] Electrical energy storage device (10) according to claim 10, - wherein the first terminal pole (35) and the third terminal pole (40) are arranged in a common third plane (220), - wherein the first flexible printed circuit board (75) and the second flexible printed circuit board (80) extend at least partially parallel to the third plane (215).

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