BATTERY BUSBAR SYSTEM AND ELECTRICAL ENERGY STORAGE WITH SUCH A BATTERY BUSBAR SYSTEM

Abstract

The invention relates to a battery busbar system (15) for an electrical energy storage device (10) of a vehicle and an electrical energy storage device (10), wherein the battery busbar system (15) comprises a flexible printed circuit board (45), a contact device (40), a connecting element (105) and at least one cell connector arrangement (35) with at least one cell connector (50), wherein the flexible printed circuit board (45) comprises a base section (85) with an outer contour (110) and at least one conductor track arrangement (65) with at least one conductor track (70), wherein the conductor track (70) of the flexible printed circuit board (45) is electrically connected to the contact device (40) and the connecting element (105) and extends from the connecting element (105) towards the contact device (40), wherein the base section (85) has at least one recess (165), wherein the connecting element (105) is at least partially inserted into the recess (165) is orderedwherein the connecting element (105) extends at least section by section between the base section (85) and the cell connector (50) and electrically connects the conductor track (70) to the cell connector (50).

Description

[0001] The invention relates to a battery busbar system according to claim 1 and an electrical energy storage device according to claim 13.

[0002] From JP 6864057 B2, a battery busbar system for an electrical energy storage device is known. The battery busbar system has an L-shaped arm that connects a base section of the printed circuit board to a cell connector. The L-shaped design of the arm requires a relatively large amount of installation space for the arrangement of the flexible printed circuit board.

[0003] The object of the invention is to provide an improved battery busbar system and an improved energy storage system. In particular, it is an object to provide a particularly compact battery busbar system that requires little installation space.

[0004] This problem is solved by means of a battery busbar system according to claim 1 and an electrical energy storage device according to claim 13. 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 flexible printed circuit board, a contact device, a connection element, and at least one cell connector arrangement with at least one cell connector. The flexible printed circuit board has a base section with an outer contour and at least one conductor arrangement with at least one conductor track. The conductor track of the flexible printed circuit board is electrically connected to the contact device and the connection element and extends from the connection element towards the contact device. In particular, the conductor track can extend along the outer contour of the base section, for example, parallel to the outer contour of the base section.The base section has at least one recess, wherein the connecting element is arranged at least partially within the recess. The connecting element extends at least partially between the base section and the cell connector and electrically connects the conductor track to the cell connector.

[0006] This design has the advantage that, by arranging the connecting element in the recess, the space requirement for the flexible circuit board to the side of the cell connector is particularly low, while at the same time providing high flexibility to allow movement of the cell connector relative to the flexible circuit board.

[0007] In another embodiment, the recess is completely enclosed by the base section and is arranged within the outer contour of the base section. The cell connector is guided past the base section, at least partially. This design has the advantage that the flexible printed circuit board can be manufactured particularly easily and cost-effectively with a particularly simple outer contour of the base section. In particular, the outer contour can, for example, be ribbon-shaped or rectangular. This also avoids waste material on the sides of the flexible printed circuit board, especially on the base section.

[0008] In another embodiment, the connecting element is attached to the base section at a fixed end and extends from the fixed end to a free end. In this embodiment, the connecting element is part of the flexible printed circuit board. The connecting element is electrically connected to the cell connector between the fixed end and the free end.

[0009] It is particularly advantageous if the fixed end is located on a side facing the cell connector and the free end on a side facing away from the cell connector. This design has the advantage that a soldered or welded connection between the connecting element and the cell connector can be created particularly easily.

[0010] In an alternative embodiment, the fixed end is located on a side facing away from the cell connector, and the free end is located on a side facing the cell connector. This embodiment has the advantage that, particularly with a straight design of the connecting element, a particularly simple design of the cell connector's connecting element is possible.

[0011] In a further embodiment, the connecting element has a first side surface extending between the fixed end and the free end, and a second side surface arranged offset from the first. The first and second side surfaces can each be planar and / or parallel to each other. A first recess section is arranged between the first side surface and the base section. A second recess section is arranged between the second side surface and the base section. This design has the advantage that even with large movements of the cell connector along the base section, contact between the connecting element and the recess is avoided.This is particularly advantageous if, for example, the connecting element and the base section are formed in one piece and of a single material, and thus both are part of the flexible printed circuit board.

[0012] In a further embodiment, the first recess section and / or the second recess section is slot-shaped on the connecting element and extends to the outer contour of the base section. This means that the first recess section and / or the second recess section is open towards the cell connector and can be manufactured particularly easily. In particular, this allows the flexible printed circuit board to be produced very easily from a sheet-shaped blank using a stamping or cutting process.

[0013] In another embodiment, the connecting element and the base section are arranged essentially in a common plane. The cell connector is arranged at least partially parallel to the base section and / or inclined, preferably perpendicularly, spaced apart in the plane from the base section. This design has the advantage that the battery busbar system is particularly flat.

[0014] In a further embodiment, the outer contour of the base section has a first base side surface facing the cell connector. The cell connector comprises a cell connector element and a connecting element attached to the cell connector element. The cell connector element is configured to electrically contact an energy storage cell of the electrical energy storage device. The cell connector element is preferably aligned parallel to the first base side surface. The cell connector element and the base section are arranged in the same plane and spaced apart by a gap. The connecting element extends between the connecting element and the cell connector element and electrically connects the cell connector element to the connecting element.This design has the advantage that the battery busbar system is particularly flat and that the space under the connecting element can be used to position the connection element and / or the base section of the flexible printed circuit board. This also reduces the space required in the transverse direction, especially parallel to the connecting element.

[0015] In a further embodiment, the connecting element is shaped like a hollow body and / or ring-shaped and / or partially ring-shaped and / or circular and / or elliptical and / or beam-shaped. In particular, the connecting element is designed to be straight.

[0016] In a further embodiment, the connecting element comprises at least one matrix material and at least one electrically conductive filler material embedded in the matrix material, wherein the matrix material provides a metallurgical bond between the cell connector and the base section. Preferably, the matrix material comprises at least one of the following matrix materials: elastomer, rubber, polyurethane, silicone, closed-cell foam, open-cell foam, mixed-cell foam, or foam. Preferably, the connecting element comprises at least one of the following filler materials: aluminum or copper. This embodiment has the advantage that, due to the elastically reversible matrix material, the connecting element is significantly more elastic and deformable than the flexible printed circuit board.This allows movement of the cell connector relative to the flexible printed circuit board to be absorbed by the elastically reversible matrix material and prevents deformation of the flexible printed circuit board, in particular compression or folding of the flexible printed circuit board.

[0017] In another embodiment, the cell connector engages in the recess, and the connecting element at least partially, preferably completely, fills the recess. This design has the advantage that vibration cracks in the connecting element are avoided. This is particularly true when the recess is completely filled by the connecting element.

[0018] An improved electrical energy storage system for an electric vehicle, in particular a hybrid vehicle or a fully electric vehicle, is provided by the electrical energy storage system comprising the battery busbar system configured as described above. Additionally, the electrical energy storage system includes a storage cell arrangement with at least two energy storage cells, wherein the cell connector electrically connects the energy storage cells to one another.

[0019] The invention is explained in more detail below with the aid of figures. These show: Fig. 1 a schematic representation of an electrical energy storage device with a battery busbar system according to a first embodiment; Fig. 2 one in Fig. 1 marked section A of a constructive design of the battery busbar system of the in Fig. 1 electrical energy storage device shown; Fig. 3 one in Fig. 2 marked section B of the in Fig. 2 battery busbar systems shown; Fig. 4 a sectional view along a Fig. Section plane CC shown in 3 through the in Fig. 3 battery busbar systems shown; Fig. 5 a schematic perspective representation of a battery busbar system according to a second embodiment; Fig. 6 one in Fig. Section D shown in Figure 5 shows the battery busbar system with a view towards the underside of the flexible circuit board; Fig. 7 a sectional view along a Fig. Section EE shown in 6 through the in Fig. 6 Battery busbar system shown according to the second embodiment; Fig. 8 a top view of a battery busbar system according to a third embodiment; Fig. 9 a sectional view along a Fig. Section EE shown in section 8 through the in Fig. 8 Battery busbar system shown according to the third embodiment; and Fig. 10 a section of a top view of a battery busbar system according to a fourth embodiment.

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

[0021] Fig. Figure 1 shows a schematic representation of an electrical energy storage device 10 with a battery busbar system 15 according to a first embodiment.

[0022] The electrical energy storage device 10 can, for example, be configured as a traction battery for an electrically powered vehicle, in particular a fully electric vehicle or a hybrid vehicle. The one in Fig. The electrical energy storage device 10 shown can also be just one module or block of a larger electrical energy storage device 10 or the traction battery. Fig. Figure 1 schematically shows only the electrical energy storage device 10, so that, for example, only a part of the battery busbar system 15 is shown.

[0023] In addition to the battery busbar system 15, the electrical energy storage device 10, for example, comprises a storage cell arrangement 20 with at least one electrical energy storage cell 25. The electrical energy storage cell 25 can, for example, be configured as a lithium-ion cell, lithium iron phosphate cell, punch cell, prismatic cell, and / or cylindrical cell. The electrical energy storage cell 25 can also be configured as a supercapacitor. Other configurations of the energy storage cell 25, both in terms of shape and chemical composition, are also possible.

[0024] The energy storage cell 25 has a battery side surface 30 that faces the battery busbar system 15. The battery side surface 30 can, for example, be planar and extend in an xy-plane.

[0025] In this embodiment, the battery busbar system 15 comprises, by way of example, at least one cell connector arrangement 35, a contact device 40, preferably at least one flexible printed circuit board 45, at least one first battery terminal 75, and a second battery terminal 80. Additionally, the battery busbar system 15 can have a carrier 61 which is arranged adjacent to the battery side surface 30. The carrier 61 can be single-layered or multi-layered.

[0026] The cell connector arrangement 35 comprises at least one cell connector 50, preferably several cell connectors 50, arranged, for example, in a first cell connector row 62. The first cell connector row 62 can, for example, be aligned parallel to the x-axis.

[0027] Additionally, the cell connector arrangement 35 can have at least one cell connector 50, preferably several cell connectors 50, arranged, for example, in a second cell connector row 63. The second cell connector row 63 can, for example, be aligned parallel to the x-axis and / or parallel to the first cell connector row 62.

[0028] The first cell connector row 62 and the second cell connector row 63 of cell connectors 50 of the cell connector arrangement 35 are spaced apart from each other in the transverse direction (y-direction), with a free space 90 arranged between the cell connector rows 62, 63.

[0029] The respective cell connector 50, for example, electrically connects a first terminal of the energy storage cell 25 with a second terminal of another energy storage cell 25 of the storage cell arrangement 20, which is located, for example, closest to the energy storage cell 25. The cell connector 50 can be electrically conductive. The cell connectors 50 are electrically connected to each other, for example, only via the energy storage cell 25.

[0030] The cell connector 50 can, for example, include a cell connector element 55, which is manufactured from a plate-shaped blank and comprises, for example, a particularly electrically conductive material such as aluminum and / or copper and / or steel. In particular, the cell connector element 55 can be made of a material that predominantly (greater than 50% by mass) contains aluminum.

[0031] The cell connector element 55 is, for example, arranged essentially parallel to the battery side surface 30. It is also conceivable that the cell connector 50 electrically connects several terminals of several energy storage cells 25. The energy storage cells 25 can be electrically connected to each other by means of the cell connector 50 in parallel and / or in series and / or in parallel-series.

[0032] Mechanically, the cell connector 50 can be connected to the respective terminal pole of the associated energy storage cell 25, for example, by means of a material-bonded connection, in particular a welded connection, most advantageously by means of an ultrasonic welded connection or a laser welded connection.

[0033] The cell connector arrangement 35 can be electrically connected to at least one battery terminal 75, 80. The electrical energy storage device 10 can be electrically connected to a high-voltage system of the vehicle via the battery terminal 75, 80. The electrical energy stored in the energy storage cell 25 can be supplied via the battery terminal 75, 80, or the energy storage cell 25 of the storage cell arrangement 20 can be charged with electrical energy.

[0034] In this embodiment, the flexible printed circuit board 45 is arranged transversely between the two cell connector rows 62, 63 of the cell connector 50. The flexible printed circuit board 45 can be positioned essentially at the same level as the cell connector arrangement 35. A slight vertical offset (z-direction) relative to the cell connector arrangement 35 is also possible.

[0035] The flexible printed circuit board (FPC) 45 can be single-layer or multi-layer. The flexible printed circuit board 45 is also referred to as a flexible printed circuit (FPC).

[0036] The flexible printed circuit board 45 has a flexible carrier layer 60 on and / or at which at least one conductor arrangement 65 with at least one conductor 70 is arranged. For the sake of clarity, the representation of the conductor 70 is omitted. Fig. 1. The conductor track 70 can, for example, be electrically connected to the cell connector 50. Furthermore, the conductor track 70 extends towards the contact device 40 and connects the cell connector 50 to the contact device 40 electrically in sections.

[0037] Due to the flexible carrier layer 60 of the flexible printed circuit board 45, the flexible printed circuit board 45 can be bent reversibly and non-destructively with minimal force by an angle of at least 30° up to and including 300°. In particular, the flexible printed circuit board 45 is especially well suited to be laid parallel to the battery side surface 30 or laid within the carrier and / or to conforming to the battery side surface 30.

[0038] Additionally, the battery busbar system 15 can also include at least one sensor, for example a temperature sensor, which is electrically connected to, for example, one of the conductor tracks 70. The temperature sensor can be thermally connected to at least one of the energy storage cells 25.

[0039] During operation of the electrical energy storage device 10, for example during charging or discharging with an electric battery via the battery terminals 75, 80, an operating parameter changes, such as the cell voltage of the energy storage cell 25. Furthermore, the energy storage cell 25 can heat up considerably, for example during a fast charging process. In particular, the cell voltage of the energy storage cell 25 also changes during the fast charging process. To optimally charge or discharge the energy storage cell 25 and / or to prevent charging with excessive electrical power, a battery management system (not shown) monitors the cell voltage of the energy storage cell 25 and controls, for example, the fast charging current to prevent damage and / or destruction of the energy storage cell 25 of the electrical energy storage device 10.

[0040] Furthermore, the geometric extent of the energy storage cell 25 changes with temperature. Of particular relevance is the temperature-dependent change in the longitudinal thickness of the energy storage cell 25.

[0041] Fig. 2 shows one in Fig. 1 marked section A of a constructive design of the battery busbar system 15 of the in Fig. 1 shown electrical energy storage device 10.

[0042] In addition, the cell connector 50 can have a connecting element 95 next to the plate-shaped cell connector element 55. The connecting element 95 can, for example, be arranged on the upper side of the cell connector element 55 on a side facing away from the battery side surface 30 and be mechanically and / or electrically connected to the cell connector element 55.

[0043] The cell connector element 55 preferably comprises a first material, preferably aluminum. The connecting element 95 preferably comprises a second material. In particular, the connecting element 95 comprises a second material which, in an electrochemical series with respect to the hydrogen electrode, is arranged between the first material and a third material from which the conductor track 70 is made. The connecting element 95, for example, comprises nickel as the predominant second material and / or is nickel-plated.

[0044] By means of the connecting element 95, the first material of the cell connector element 55 or of the connecting element 95 is electrochemically isolated from the third material of the conductor track 70 and intermetallic corrosion of the cell connector element 55 and / or the circuit board 45 is avoided.

[0045] In this embodiment, the connecting element 95 has a plate-shaped form and projects transversely beyond an outer contour 100 of the cell connector element 55 towards the circuit board 45. Furthermore, the connecting element 95 is arranged on the upper side of the cell connector element 55 on the side facing the circuit board 45.

[0046] In this embodiment, the connecting element 95 and the cell connector element 55 are, by way of example, formed in two parts. Of course, it is also possible for the connecting element 95 and the cell connector element 55 to be formed in one piece and made of a single material.

[0047] The battery busbar system 15 further comprises a connection element 105. The flexible printed circuit board 45 has a base section 85. The base section 85 is, for example, arranged essentially in a straight line, parallel to the x-axis. Furthermore, the base section 85 can be arranged between the two cell connector rows 62, 63 of cell connectors 50 in the free space 90 such that at least the base section 85 and the cell connector element 55 are arranged in a common plane, for example an xy-plane.

[0048] The flexible printed circuit board 45 has a base section 85. In particular, the printed circuit board 45 can have several connection elements 105, wherein a number of connection elements 105 can essentially correspond to a number of cell connectors 50.

[0049] In this embodiment, the circuit board 45 is arranged, for example, in the transverse direction between the two cell connector rows 62, 63 of cell connectors 50. The base section 85 can be essentially ribbon-shaped. Additionally, openings 106 can be arranged in the flexible circuit board 45, which are designed, for example, as through-holes to allow access to the battery side surface 30.

[0050] To ensure a position of the flexible printed circuit board 45 relative to the cell connector assembly 35, the flexible printed circuit board 45 and the cell connector assembly 35 can be attached to the carrier 61.

[0051] In this embodiment, the base section 85 is ribbon-like and extends essentially in the longitudinal direction. The base section 85 has an outer contour 110 which, in this embodiment, exemplarily delimits the base section 85 in the x and y directions. On the in Fig. On the side facing the viewer, which in the assembled state of the battery busbar system 15 is located on one side facing away from the storage cell arrangement 20, the flexible circuit board 45 has a top surface 115. Opposite the top surface 115 in the z-direction is a bottom surface 120, which in Fig. 2 is essentially concealed, arranged on circuit board 45.

[0052] The outer contour 110 has a first base side surface 125 on the cell connector row nearest to it and a second base side surface 130 on a side facing away from the first base side surface 125 in the transverse direction, wherein the base side surfaces 125, 130 connect the top surface 115 with the bottom surface 120.

[0053] In this embodiment, as shown in Fig. Figure 2 shows that the flexible printed circuit board 45 has several connecting elements 105, each connecting element 105 being electrically and mechanically connected to an associated connecting element 95 of the cell connector 50. The first base surface 125 is arranged directly adjacent to, or separated from, the nearest cell connector row 62, 63 of cell connector elements 55 by only a narrow gap 135, while the second base surface 130 has a greater distance to the same cell connector row 62, 63.

[0054] In this embodiment, the base section 85 extends along the x-axis and parallel to the x-axis. Furthermore, for example, the first base side surface 125 and / or the second base side surface 130 can each be aligned parallel to the x-axis and extend, for example, in an xz-plane.

[0055] As explained above, the energy storage cells 25 can heat up during the charging or discharging of the storage cell arrangement 20. During heating or cooling, the energy storage cells 25 can expand or contract. In this embodiment, the expansion or contraction occurs primarily in the longitudinal direction (x-direction). To compensate for this change in thickness, the cell connector element 55 can, for example, be flexibly deformable by means of a bulge 140 extending upwards or downwards in the z-direction.

[0056] Fig. 3 shows one in Fig. 2 marked section B of the in Fig. 2 shown battery busbar system 15.

[0057] The in Fig. Section B shown in Figure 3 is an example of the other connecting elements 105, cell connectors 50 and the flexible printed circuit board 45, which are also present, particularly at the base section 85. These are essentially identical to the embodiment described below.

[0058] The base section 85 has a recess 165. The recess 165 is, for example, located on the first base side surface 125 and extends in the z-direction through the base section 85 from the top surface 115 to the bottom surface 120. The recess 165 is preferably designed as a through-opening in the base section 85. On the side facing the first base side surface 125, the recess 165 is, for example, open in the transverse direction. In the transverse direction, the recess 165 extends from the first base side surface 125 along an axis 146 towards the second base side surface 130. The axis 146 can be aligned parallel to the y-axis. The recess 165 terminates at a recess base 147 spaced apart from the second base side surface 130. In the top view, the recess 165 can be seen in the following: Fig. 3. The recess 165 essentially has a rectangular shape in the base section 85. Of course, it would also be possible for the recess 165 to have a different shape.

[0059] In this embodiment, the connecting element 105 can be arranged at least partially, preferably completely, in the recess 165. It is also possible that only a portion of the connecting element 105 extends into the recess 165 and, for example, projects slightly upwards in the z-direction beyond, for example, the top surface 115.

[0060] The connecting element 105 is designed in a plate-like form in the embodiment and essentially has a rectangular shape in the Fig. 3 top view of the connecting element 105 shown.

[0061] The connecting element 105 can be connected and fastened at a first fixed end 145 to the base section 85, in particular to the recess base 147. In particular, it is possible that the connecting element 105 and the base section 85 are formed in one piece and of a single material, and thus the connecting element 105 is part of the flexible printed circuit board 45.

[0062] The connecting element 105 extends along an axis 146 from the base section 85 in the direction of the nearest cell connector element 55. The axis 146, and thus the connecting element 105, is inclined at an angle α to a principal extension direction of the base section 85. In particular, the connecting element 105 can, for example, be oriented perpendicular to the principal extension direction of the base section 85.

[0063] Starting from the fixed end 145, the connecting element 105 extends, in this embodiment, by way of example, towards the cell connector element 55 to a free end 150. In this embodiment, the free end 150 is, by way of example, arranged on the side facing the nearest cell connector element 55.

[0064] The free end 150 is arranged at an exemplary distance from the cell connector element 55. The gap 135 can be arranged between the free end 150 and the cell connector element 55.

[0065] Furthermore, for example, the first base face 125 and the free end 150 can be arranged in a common plane, in particular in a common xz-plane.

[0066] In the longitudinal direction, the connecting element 105 is bounded between the fixed end 145 and the free end 150 by a first side surface 155 and, offset longitudinally from the first side surface 155, by a second side surface 160. The first side surface 155 and the second side surface 160 can be aligned parallel to each other, so that, as already explained above, the connecting element 105 essentially has a rectangular, plate-like shape. In particular, the embodiment preferably avoids curves, especially an S-shaped or L-shaped configuration of the connecting element 105.

[0067] At least one of the conductor tracks 70 of the conductor track arrangement 65 extends along the base section 85 and the connecting element 105. The conductor track 70 is preferably electrically connected to the connecting element 95 between the fixed end 145 and the free end 150.

[0068] By arranging the connecting element 105 in the recess 165, the fixed end 145 is offset with respect to the first base side surface 125 and therefore has an increased distance to the associated cell connector element 55.

[0069] When the thickness of the electrical energy storage cell 25 changes thermally, the distance between the terminals, which are connected to each other via the cell connector element 55, also changes. During this movement, the terminal pole carries with it the connecting element 95 arranged on the cell connector element 55, causing it to move essentially along the x-axis. By connecting the rigid connecting element 95 (in the x- and y-directions), the connecting element 95 actuates the more flexible connecting element 105. The connecting element 105 pivots about a pivot axis 170, which is perpendicular to the top surface 115 and extends through the fixed end 145.

[0070] The pivotability of the connecting element 105 enables decoupling of the base section 85 and thus decoupling of large parts of the flexible printed circuit board 45 from the respective cell connector element 55. This allows the base section 85 to be attached to the carrier 61 without stress or with only minimal mechanical stress. It also prevents vibration-induced fracture of the flexible printed circuit board 45.

[0071] In this embodiment, the recess 165 can have a first recess section 171 and a second recess section 175, wherein the first recess section 171 adjoins the first side surface 155 in the longitudinal direction and the second recess section 175 adjoins the second side surface 160 on a side facing away from the first side surface 155. The recess contour on the first recess section 171 can be formed parallel to the first side surface 155 and in the second recess section 175 parallel to the second side surface 160, such that both the first recess section 171 and the second recess section 175 are slot-shaped, preferably with a constant width.

[0072] Fig. Figure 4 shows a sectional view along a [unclear] in Fig. Section plane CC shown in 3 through the in Fig. 3 shown battery busbar system 15.

[0073] The first and second recess sections 171, 175 prevent contact between the first side surface 155 and / or the second side surface 160 with the base section 85 when the connecting element 105 is pivoted about the pivot axis 170, thus preventing damage to the flexible circuit board 45.

[0074] Fig. Figure 5 shows a schematic perspective view of a battery busbar system 15 according to a second embodiment.

[0075] The battery busbar system 15 according to the second embodiment is essentially identical to that described in the Fig. The first embodiment of the battery busbar system 15 is described in sections 1 to 4. The following discussion focuses exclusively on the differences between the two embodiments described in the following sections. Fig. 5 battery busbar system 15 shown compared to the one in the Fig. The battery busbar system 15 described in sections 1 to 4 according to the first embodiment has been incorporated. Furthermore, Fig. 5 simplified representation.

[0076] In this embodiment, the recess 165 in the base section 85 is arranged such that it is completely enclosed within the outer contour 110 of the base section 85. The recess 165 can be positioned closer to the first base side surface 125 facing the first cell connector row 62 than to the second base side surface 130. In other words, the recess is positioned closer to the first cell connector row 62 of cell connectors 50 that are to be contacted than to the cell connectors 50 that are not contacted.

[0077] The recess 165, for example, has a predominantly circular, elliptical, or rectangular shape. Due to the closed design of the recess 165, the base section 85 is closed both on the first base side surface 125 and on the second base side surface 130, which is arranged opposite it in the transverse direction.

[0078] The connecting element 95, for example, is guided parallel to the top surface 115 on the base section 85 towards the recess 165 and thus bridges a partial area 180 of the base section 85, which is arranged in the transverse direction between the recess 165 and the first base side surface 125.

[0079] Fig. 6 shows one in Fig. Section D shown in Figure 5 shows the battery busbar system 15 with a view towards the underside 120 of the flexible circuit board 45.

[0080] In this embodiment, the connecting element 105 is arranged in the recess 165 such that the fixed end 145, with which the connecting element 105 is connected to the base section 85, is located on the side facing the first base surface 125 and thus on the side facing the contacted cell connector element 55. The free end 150 of the connecting element 105 faces away from the first base surface 125 and thus from the contacted cell connector element 55 in the transverse direction. The connecting element 105 has, for example, a teardrop-shaped design.

[0081] It should be noted that it is of course also possible that, analogous to the one in the Fig. In the embodiment shown in 1 to 4, the fixed end 145 is arranged on the side facing away from the first base surface 125 and thus from the contacted cell connector element 55, and the connecting element 105 extends from the fixed end 145 to the first base surface 125 and thus to the contacted cell connector element 55.

[0082] By guiding the connecting element 95 parallel to the top surface 115, and thus by bridging the partial area 180 with the connecting element 95, the distance between the contact of the conductor track 70 on the connecting element 105 and the first base surface 125 can be chosen to be particularly large. Furthermore, pivotability about the pivot axis 170 is ensured, especially when the energy storage cells 25 move longitudinally, and compression of the connecting element 105 is avoided.

[0083] In this embodiment, for example, the connecting element 105 can be arranged essentially completely in the recess 165, so that the battery busbar system 15 is particularly flat in the z-direction.

[0084] Fig. Figure 7 shows a sectional view along a [unclear] in Fig. Section EE shown in 6 through the in Fig. 6 Battery busbar system 15 shown according to the second embodiment.

[0085] The bridging of the partial area 180 by the connecting element 95 is clearly shown, wherein the bridging of the partial area 180 is made possible, for example, by the fact that the flexible printed circuit board 45 is preferably thinner in the z-direction than the cell connector element 55.

[0086] Fig. Figure 8 shows a top view of a battery busbar system 15 according to a third embodiment.

[0087] The battery busbar system 15 in Fig. 8 is essentially identical to the one in the Fig. Battery busbar system 15 shown in 1 to 7 according to the first and second embodiments, in particular to the one shown in Fig. second embodiment shown in 5 to 7.

[0088] The following will focus exclusively on the differences of the in Fig. 8 shown battery busbar system 15 according to the third embodiment compared to the one in the Fig. Battery busbar system 15 shown in sections 5 to 7 according to the second embodiment.

[0089] In this embodiment, the base section 85 of the flexible printed circuit board 45 and the connecting element 105 are formed in two parts. The connecting element 105 is hollow, in particular ring-shaped. A partially ring-shaped and / or circular and / or elliptical design would also be possible.

[0090] The connecting element 105 preferably comprises a matrix material and at least one electrically conductive filler material embedded in the matrix material.

[0091] It is particularly advantageous if the connecting element 105 comprises at least one of the following matrix materials: elastomer, rubber, polyurethane, silicone. Furthermore, the connecting element 105 preferably comprises at least one of the following filler materials: aluminum, copper.

[0092] In this embodiment, the connecting element 105 essentially fills the recess 165 completely and is preferably materially bonded to the base section 85.

[0093] Fig. Figure 9 shows a sectional view along a [unclear] in Fig. Section EE shown in section 8 through the in Fig. 8 Battery busbar system 15 shown according to the third embodiment.

[0094] In contrast to the one in the Fig. The embodiment shown in 1 to 7 is in the Fig. 8 and Fig. 9 the flexible circuit board 45, for example, is arranged above the cell connector 50 instead of in the free space 90, so that the underside 120 is arranged on the side facing the cell connector 50.

[0095] The cell connector 50 can, as already mentioned in the Fig. As explained in Figures 1 to 7, the connecting element 95 has a pin-shaped form and extends substantially at an angle, in particular perpendicularly to the underside 120. The connecting element 95 can also have a T-shaped profile in cross-section. Alternatively, the connecting element 95 and the cell connector element 55 can be formed in one piece and made of a single material.

[0096] The connecting element 95 engages in the recess 165 and in the connecting element 105 and is preferably arranged centered with respect to the recess 165. In particular, the connecting element 95 can be materially bonded to the matrix material.

[0097] This design has the advantage that the matrix material, which is preferably designed as an open-pore foam and / or closed-pore foam and / or mixed-pore foam, enables good electrical contact between the conductor track 70 and the cell connector 50 while simultaneously providing high flexibility between the flexible circuit board 45 and the cell connector 50, so that movement in the longitudinal direction (x-direction), especially at the cell connector 50, relative to the flexible circuit board 45 in the base section 85 can be reversibly elastically compensated by the connecting element 105 without deforming the base section 85 of the flexible circuit board 45.

[0098] Fig. Figure 10 shows a section of a top view of a battery busbar system 15 according to a fourth embodiment.

[0099] The battery busbar system 15 is essentially identical to the one in the Fig. The battery busbar system 15 described in sections 1 to 4 is designed. The differences of the system described in the following will be discussed in contrast. Fig. 10 battery busbar system 15 according to the fourth embodiment compared to the one shown in the Fig. 1 to 4 described battery busbar system 15 according to the first embodiment.

[0100] In Fig. 10 Some of the connecting elements 95 and the attachment elements 105 extend obliquely at an angle α along the axis 146 to the main extension direction of the base section 85. In particular, the angle α can be, for example, from 30° inclusive to 75° inclusive, and especially 45°.

[0101] This design has the advantage that even in difficult installation space situations a good and flexible connection of the cell connector 50 to the base section 85 and the flexible circuit board 45 is possible. Reference symbol list 10 electrical energy storage devices 15 Battery busbar system 20 memory cell arrangement 25 Energy storage cells 30 Battery side surface 35 cell connector arrangement 40 Contact device 45 flexible printed circuit boards 50 cell connectors 55 cell connector element 60 flexible carrier layer 61 carriers 62 first cell connector row 63 second cell connector row 65 Conductor arrangement 70 conductor track 75 Battery connection 80 Battery connection 85 Basic section 90 free space 95 Connecting element 100 cell connector element outer contour 105 Connecting element 106 Opening 110 Outer contour 115 Top 120 bottom 125 first base side surface 130 second base side surface 135 gap 140 bulge 147 Reason for recess 145 fixed end 146 axle 150 free end 155 first side surface (of the connecting element) 160 second side surface (of the connecting element) 165 recess 170 swivel axis 171 first recess section 175 second recess section 180 sub-area α angle QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 6864057 B2

[0002]

Claims

[1] Battery busbar system (15) for an electrical energy storage device (10) of a vehicle, - wherein the battery busbar system (15) comprises a flexible printed circuit board (45), a contact device (40), a connecting element (105) and at least one cell connector arrangement (35) with at least one cell connector (50), - wherein the flexible printed circuit board (45) has a base section (85) with an outer contour (110) and at least one conductor arrangement (65) with at least one conductor (70), - wherein the conductor track (70) of the flexible printed circuit board (45) is electrically connected to the contact device (40) and the connecting element (105) and extends from the connecting element (105) towards the contact device (40), - wherein the base section (85) has at least one recess (165), - wherein the connecting element (105) is arranged at least partially in the recess (165), - wherein the connecting element (105) extends at least section by section between the base section (85) and the cell connector (50) and electrically connects the conductor track (70) to the cell connector (50). [2] Battery busbar system (15) according to claim 1, - wherein the recess (165) is completely enclosed on its circumference by the base section (85) and is arranged within the outer contour (110) of the base section (85), - wherein the cell connector (50) passes by the base section (85) at least in sections. [3] Battery busbar system (15) according to claim 1 or 2, - wherein the connecting element (105) is connected to the base section (85) at a fixed end (145) and extends from the fixed end (145) to a free end (150), - wherein the connecting element (105) is part of the flexible printed circuit board (45), - wherein the connecting element (105) is electrically connected to the cell connector (50) between the fixed end and the free end (150). [4] Battery busbar system (15) according to claim 3, - wherein the fixed end (145) is located on a side facing the cell connector and the free end (150) is located on a side facing away from the cell connector (50). [5] Battery busbar system (15) according to claim 3, - wherein the fixed end (145) is located on a side facing away from the cell connector (50) and the free end (145) is located on a side facing the cell connector (50). [6] Battery busbar system (15) according to any one of claims 3 to 5, - wherein the connecting element (105) has a first side surface (155) extending between the fixed end (145) and the free end (150) and a second side surface (160) arranged offset from the first side surface (155), - wherein a first recess section (171) of the recess (165) is arranged between the first side surface (155) and the base section (85), - wherein a second recess section (175) of the recess (165) is arranged between the second side surface (160) and the base section (85). [7] Battery busbar system (15) according to claim 6, - wherein the first recess section (171) and / or the second recess section (175) is formed in a slot shape on the connecting element (105) and extends to the outer contour (110) of the base section (85). [8] Battery busbar system (15) according to any one of the preceding claims, - wherein the connecting element (105) and the base section (85) are essentially arranged in a common plane, - wherein the cell connector (50) is arranged at least sectionally parallel to the base section (85) and / or inclined, preferably perpendicularly, spaced apart in the plane from the base section (85). [9] Battery busbar system (15) according to any one of the preceding claims - wherein the outer contour (110) of the base section (85) has a first base side surface (125) facing the cell connector (50), - wherein the cell connector (50) has a cell connector element (55) and a connecting element (95) which is attached to the cell connector element (55), - wherein the cell connector element (55) is configured to electrically contact an energy storage cell (25) of the electrical energy storage device (10), - wherein the cell connector element (55) is preferably aligned parallel to the first base side surface (125), - wherein the cell connector element (55) and the base section (85) are arranged in the common plane and spaced apart by a gap (135), - wherein the connecting element (95) is arranged extending between the connecting element (105) and the cell connector element (55) and electrically connects the cell connector element (55) to the connecting element (105). [10] Battery busbar system (15) according to any one of the preceding claims, - wherein the connecting element (105) is shaped like a hollow body and / or ring-shaped and / or partially ring-shaped and / or circular and / or elliptical and / or beam-shaped, - in particular the connecting element (105) is designed in a straight line. [11] Battery busbar system (15) according to any one of the preceding claims, - wherein the connecting element (105) comprises at least one matrix material and at least one electrically conductive filler material embedded in the matrix material, - wherein the matrix material connects the cell connector (50) to the base section (85) in a materially bonded manner, - wherein the matrix material preferably comprises at least one of the following matrix materials: elastomer, rubber, polyurethane, silicone, closed-cell foam, open-cell foam, mixed-cell foam, foam, - wherein preferably the connecting element (105) comprises at least one of the following filling materials: - Aluminum, copper. [12] Battery busbar system (15) according to any one of the preceding claims, - wherein the cell connector (50) engages in the recess (165) and the connecting element (105) at least partially, preferably completely, fills the recess (165). [13] Electrical energy storage device (10) for an electric vehicle, in particular a hybrid vehicle or a fully electric vehicle, - wherein the electrical energy storage device (10) comprises a battery busbar system (15) according to one of the preceding claims and a storage cell arrangement (20) with at least two energy storage cells (25), - wherein the cell connector (50) electrically connects the energy storage cells (25) to each other.

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