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), 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 a first flexible printed circuit board (75) and a second flexible printed circuit board (80), wherein the cell connector arrangement (46) comprises a first cell connector (45) and a second cell connector (50), wherein the first flexible printed circuit board (75) and the second flexible printed circuit board (80) are arranged at least sectionally in a stack, wherein the first flexible printed circuit board (75) comprises a first base section (85) and the second flexible printed circuit board (75) comprises a second base section (150),wherein the first flexible printed circuit board (75) has a first arm assembly (90) with a first contact arm (95) and the second flexible printed circuit board (80) has a second arm assembly (155) with a second contact arm (160), wherein the first contact arm (95) extends between the first base section (85) and the first cell connector (45) and connects the first cell connector (45) to the first base section (85), wherein the second contact arm (160) extends between the second base section (150) and the second cell connector (50) and connects, wherein the second contact arm (160) is arranged offset along the first axis (x) relative to the first contact arm (95).

Description

The invention relates to a battery busbar system according to patent claim 1 and an electrical energy store according to patent claim 8.Electrical energy stores for electric vehicles are known. In this case, in many electrical energy stores, so-called round cells are used which store the electrical energy. The round cells are electrically connected by means of cell connectors. Monitoring is carried out by means of a battery management system which is electrically connected to the round cells via a battery busbar system and a printed circuit board in order to detect a voltage of the round cells.U.S. Pat. No. 9,024,572 B2 and WO 2019 / 146197 A1 disclose electrical energy stores.It is an object of the invention to provide an improved battery busbar system and an improved electrical energy store.This object is achieved by means of a battery busbar system according to patent claim 1, and by means of an electrical energy store according to patent claim 8. Advantageous embodiments are given in the dependent claims.It has been recognized that an improved battery bus bar system for an electrical energy store of a vehicle can be provided in that the battery bus bar system has a printed circuit board arrangement and a cell connector arrangement. The circuit board arrangement has at least a first flexible circuit board and a second flexible circuit board. The cell connector arrangement has 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 arrangement of the electrical energy storage device and the second cell connector is electrically connectable to at least one second energy storage cell of the energy storage cell arrangement of the electrical energy storage device. The first cell connector is electrically and mechanically connected to the first flexible circuit board and the second cell connector is electrically and mechanically connected to the second flexible circuit board. The first flexible printed circuit board and the second flexible printed circuit board are arranged at least in sections in a stack.This configuration has the advantage that the battery busbar system can also be designed in very confined installation space conditions and can provide sufficient information by means of the flexible printed circuit boards arranged one above the other in the stack in order to supply a battery management system of the electrical energy store with sufficient information about operating parameters of the electrical energy store.The first and second flexible printed circuit board arranged in the stack can be formed particularly easily, in particular only in one or two layers, by the stack-like arrangement, with the result that the production costs for the first and second flexible printed circuit boards are particularly low. Furthermore, the flexible printed circuit boards arranged in the stack can enable a modular construction of the battery busbar system, by means of which the number of electrical energy storage cells which are contacted by the battery busbar system can also be varied accordingly as a function of the number of flexible printed circuit boards.The first flexible circuit board has a first base portion and the second flexible circuit board has a second base portion. The first base portion and the second base portion each extend along a first axis. The first base portion further extends substantially parallel to the second base portion. This configuration has the advantage that the base section can be guided in particular in a stack with the second base section. In this case, in particular in a direction perpendicular to the first axis, the first base section and the second base section can be formed with an identical width, so that the installation space requirement for the first and second base sections is particularly low.It is particularly advantageous if a gap is arranged between the first base section and the second base section. This configuration has the advantage that undesired scrubbing, for example by vibrations in the electric vehicle of the first base section and of the second base section on one another, can be avoided through the gap. The printed circuit board arrangement can be configured to be particularly flat in that the first base section and the second base section bear directly against one another, but are displaceable with respect to one another.The first flexible circuit board includes a first arm assembly having at least one first contact arm and the second flexible circuit board includes a second arm assembly having at least one second contact arm. The first contact arm connects to the first base portion and extends between the first base portion and the first cell connector, the first contact arm connecting the first cell connector to the first base portion, the second contact arm connects to the second base portion and extends between the second base portion and the second cell connector, the second contact arm connecting the second cell connector to the second base portion, the second contact arm being offset from the first contact arm along the first axis. This configuration has the advantage that a movement of the electrical energy stores along the first axis can be carried along by means of the contact arms without the base section being deformed in each case in the process. Thermal tolerances can thereby be compensated by means of the contact arm. The offset of the first and second contact arms thereby offers the possibility of contacting different electrical energy storage cells via the plate element.In a further embodiment, the first arm arrangement has at least two first contact arms which are arranged offset along the first axis and are each connected to the first base section by the first fixed end. Along the first axis, the second contact arm is arranged between the two first contact arms. The alternating arrangement of the first and second contact arms makes a particularly tight connection to different cell connectors possible in the longitudinal direction.In a further embodiment, the first flexible printed circuit board has a first fastening section and the second flexible printed circuit board has a second fastening section. The first fastening portion is tab-shaped and has a first fastening receptacle, wherein the first fastening portion is fastened at a second fixed end to the first base portion and extends away from the first base portion. The second fastening section is tab-shaped and has a second fastening receptacle. The second attachment portion is attached at a fifth fixed end to the second base portion and extends away from the second base portion. The first fastening receptacle and the second fastening receptacle are arranged so as to overlap. By the covering arrangement, the first flexible printed circuit board and the second flexible printed circuit board can be connected to one another. In particular, for example, a fastening element, for example of a carrier of the battery busbar system, can be guided through the first and second fastening receptacles. The first and second fastening receptacles also support an alignment of the first flexible printed circuit board and the second flexible printed circuit board with respect to one another by their aligned and covering arrangement. Furthermore, at the two fastening sections, the two printed circuit boards can be connected to one another for transport.In a further embodiment, the battery busbar system has a fastening element, wherein the fastening element reaches through and connects the first fastening receptacle and the second fastening receptacle. As a result, the defined alignment of the first and second flexible printed circuit boards can be ensured even during transport of the printed circuit board arrangement. In particular, an unwanted mechanical load of a contact device to which the first and second base sections are connected, for example, is avoided in this case.In another embodiment, the battery busbar system includes a carrier, wherein the first flexible circuit board and the second flexible circuit board are attached to the carrier in the stack. This ensures secure retention of the first flexible circuit board and the second flexible circuit board. Also, an undesired slipping of the two flexible printed circuit boards with respect to one another is avoided.In a further embodiment, the first flexible printed circuit board has a first alignment section and the second flexible printed circuit board has a second alignment section, wherein the first alignment section is designed in the form of a tab and has a first alignment receptacle. The first alignment portion is fixed at a third fixed end to the first base portion and extends away from the first base portion. The second alignment portion is tab-shaped and has a second alignment receptacle, wherein the second alignment portion is fastened at a sixth fixed end to the second base portion and extends away from the second base portion. By means of the alignment sections, which are arranged overlapping one another, a defined alignment of the first flexible printed circuit board and of the second flexible printed circuit board can be ensured.It has been recognized that an improved electrical energy store for an electric vehicle can be provided in that the electrical energy store has an energy storage cell arrangement and a battery busbar system described above. The energy storage cell arrangement has at least one first energy storage cell and a second energy storage cell arranged offset from the first energy storage cell. The first plate element is electrically and mechanically connected to a first connection pole of the first energy storage cell and the second plate element is electrically and mechanically connected to a third connection pole of the second energy storage cell.The use of the battery busbar system has the advantage that accessibility to the energy storage cells is ensured, for example, from above on the side facing the battery busbar system, and as a result a covering or overlapping of the electrical energy storage cells in particular by the flexible printed circuit boards arranged in the stack can be kept low.In a further embodiment, the first connection pole and the third connection pole are arranged in a common third plane, wherein the first flexible printed circuit board and the second flexible printed circuit board extend at least in sections parallel to the third plane. As a result, the battery busbar system can be arranged flat on the energy storage cell arrangement.The invention is explained in more detail below with reference to figures. The following are shown: FIG. 1 shows a detail of a plan view of an electrical energy store of an electric vehicle having a battery busbar system according to a first embodiment; FIG. 2 shows a plan view of the battery busbar system of the electrical energy store shown in FIG. 1 ; FIG. 3 shows a plan view of a first flexible printed circuit board of the battery busbar system shown in FIGS. 1 and 2 ; FIG. 4 shows a plan view of a second flexible printed circuit board of the battery busbar system shown in FIGS. 1 and 2 ; FIG. 5 shows a side view of a printed circuit board arrangement of the battery busbar system shown in FIGS. 1, 2, 3 to 4; FIG. 6 shows a sectional view along a sectional plane A-A shown in FIG. 5 through the battery busbar system shown in FIG. 5 ; FIG. 7 shows a detail of a plan view of a battery busbar system according to a second embodiment.In the following figures, reference is made to a coordinate system for ease of understanding. The coordinate system has an x-axis (longitudinal direction), a y-axis (transverse direction) and a z-axis (height direction). The coordinate system can be designed as a right-hand system.FIG. 1 shows a detail of a plan view of an electrical energy store 10 of an electric vehicle having a battery busbar system 15 according to a first embodiment.The electrical energy store 10 has a battery busbar system 15 and an energy store cell arrangement 20. The energy storage cell arrangement 20 preferably has a multiplicity of electrical energy storage cells 25, 30. In the embodiment, the energy storage cells 25, 30 are arranged, for example, in a narrow packing arrangement and are designed, for example, as round cells. The arrangement has such a high packing density that the energy storage cells 25, 30 are arranged close to one another, preferably in direct contact with one another.The energy storage cell 25, 30 can be designed, for example, as a lithium ion cell, lithium iron phosphate cell or as a supercap. It is of course also possible for the energy storage cell 25, 30 to be of a different design. It is also possible that instead of the geometric configuration formed as a round cell, the energy storage cell 25, 30 has a different geometric shape. In particular, it is possible here, for example, for the energy storage cell 25, 30 to be shaped prismatically or as a pouch cell.In the embodiment, the electrical energy store 10 is designed, for example, as a traction battery for an electric vehicle, in particular a fully electric vehicle or a hybrid vehicle. It is of course also possible for the electrical energy store 10 to be designed as a supply battery, for example for storing electrical energy in a building.The energy storage cell arrangement 20 has a multiplicity of electrical energy storage cells 25, 30, wherein, for easier understanding of the embodiment, 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 each of identical design. This also relates to the further energy storage cells 25, 30.The first energy storage cell 25 extends along the z-axis and has a first connection pole 35 and a second connection pole arranged on a side facing away from the observer.The second energy storage cell 30 has a third connection pole 40, which is arranged on the side of the second energy storage cell 30 facing the observer. Furthermore, the second energy storage cell 30 has a fourth connection pole, which is arranged on a side facing away from the observer and is thereby concealed for the observer.At the first connection pole 35 to fourth connection pole 40, the energy storage cells 25, 30 are connected to one another by power electricity in order to discharge or charge the energy storage cell 25, 30.The battery busbar system 15 is arranged on the energy storage cell arrangement 20. The battery busbar system 15 has a cell connector arrangement 46 having 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 busbar.The contact device 60 is connected to the printed circuit board arrangement 55 and can be connected in terms of data technology to a battery management system. At the contact device 60, the battery busbar system 15 provides information about at least one operating state of the electrical energy store 10, in particular about the energy store cell arrangement 20 and its energy store cells 25, 30. The information can have, for example, information about a battery voltage of the energy storage cells 25, 30 and / or a temperature of the respective energy storage cells 25, 30.In the embodiment, the first cell connector 45 contacts a plurality of first connection poles 35 of the first energy storage cells 25, so that the plurality of first energy storage cells 25 are connected in parallel by means of the first cell connector 45. In the embodiment, the second cell connector 50 of the cell connector arrangement 46 contacts third connection poles 40 of the plurality of second energy storage cells 30, such that the second energy storage cells 30 are connected in parallel, for example.In the embodiment, the first cell connector 45 and the second cell connector 50 are manufactured from a sheet metal material, for example, so that the first energy storage cells 25 are electrically connected to one another by means of the first cell connector 45 and the second energy storage cells 30 are electrically connected to one another by means of the second cell connector 50 in a simple manner.It is pointed out that the energy storage cells 25, 30 can of course also be interconnected with one another in a different manner. In particular, it is conceivable that the energy storage cells 25, 30 can be electrically connected to one another, for example, in series or in series-parallel. For this purpose, the cell connector arrangement 46 is respectively configured accordingly.In the embodiment, for example, the cell connector 45, 50 is formed in a strip shape and extends substantially in an xy plane.The printed circuit board arrangement 55 is arranged on a side of the cell connector arrangement 46 facing away from the energy storage cell arrangement 20.In the embodiment, it is to be ensured that the printed circuit board arrangement 55 requires particularly little installation space, in particular in the y direction, and the printed circuit board arrangement 55 is thereby of particularly slender design. In particular, this is necessary in order to allow secure access to, for example, the first and third connection terminals 35, 40, in order to connect the respective cell connector 45, 50 to the respectively assigned connection terminal 35, 40, for example, by means of a spot welding method.The carrier 70 may be disposed, for example, between the circuit board assembly 55 and the cell connector assembly 46. The carrier 70 can be manufactured, for example, from an electrically non-conductive material. The bracket 70 serves to secure the circuit board assembly 55, and preferably the cell connector assembly 46.FIG. 2 shows a plan view of the battery busbar system 15 of the electrical energy store 10 shown in FIG. 1, the illustration of the cell connector arrangement 46 in FIG. 2 being omitted.The printed circuit board arrangement 55 of the battery busbar system 15 has 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 circuit board 80 is substantially hidden by the first flexible circuit board 75 in FIG. 2. In this case, the second flexible printed circuit board 80 is arranged, for example, 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 circuit board 75 and the second flexible circuit board 80 are preferably arranged one above the other in a stack.Furthermore, the first and second flexible printed circuit boards 75, 80 arranged in the stack can each be configured as a single layer. As a result, the flexible printed circuit board 75, 80 can be adapted to the configuration of the energy storage cell arrangement 20 in a particularly flexible and simple manner.The first flexible circuit board 75 has a first base portion 85. The first base section 85 extends, for example, along the x-axis substantially in a first plane 210, which is formed, for example, as an xy-plane. The first base portion 85 may be formed in a strip shape.Further, the first flexible circuit board 75 includes a first arm assembly 90 having at least one first contact arm 95. In FIG. 2, for example, two contact arms 95 of the first arm arrangement 90 are shown, wherein the two first contact arms 95 are arranged offset with respect to one another in the x direction.Each first contact arm 95 is laterally connected to the first base portion 85 at a first fixed end 100. In this case, for example, the two first contact arms 95 can be connected to the first fixed end 100 in the transverse direction in each case on the same transverse side of the first base section 85. It is of course also possible for the first contact arms 95 to be arranged opposite and / or on both sides of the first base section 85 in the transverse direction.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 has, for example, a plate-shaped configuration. The plate element 110, 115 can for example predominantly comprise nickel as material.The first plate member 110 includes a first board connection portion 111 and a first cell connector connection portion 112 disposed opposite to each other in FIG. 2, for example, in the lateral direction of the first board connection portion 111. The first circuit board terminal portion 111 is connected to the first cell connector terminal portion 112.The second plate element 115 has a second circuit board connection portion 116 and a second cell connector connection portion 117 which is arranged opposite in FIG. 2 for example in the transverse direction to the second circuit board connection portion 116. The second circuit board terminal portion 116 is connected to the second cell connector terminal portion 117.In the embodiment, for example, the first plate member 110 is arranged transversely between the first cell connector 45 and the first contact arm 95. In this case, the first plate element 110 with the first printed circuit board connection section 111 is electrically and mechanically connected to a first free end 105 of the first contact arm 95 and with the first cell connector connection section 112 to the first cell connector 45. The first plate member 110 electrically connects the first contact arm 95 to the first cell connector 45.The first flexible printed circuit board 75 has at least one first conductor track 120, wherein the first conductor track 120 extends respectively over the first contact arm 95 and the first base section 85 and as far as the contact device 60. The first conductor track 120 thus electrically connects the contact device 60 to the first cell connector 45 and thus to the first electrical energy storage cell 25 via the first plate element 110.FIG. 3 shows a plan view of the first flexible printed circuit board of the battery busbar system 15 shown in FIGS. 1 and 2 and the first plate elements 110 arranged on the first flexible printed circuit board 75.In addition, the first flexible circuit board 75 may include, for example, a first mounting portion 125 and a first aligning portion 130. In the embodiment, the first fastening portion 125 and / or the first alignment portion 130 are tab-shaped. The first fastening portion 125 is fastened to the first base portion 85, for example, by a second fixed end 135, and extends away from the first base portion 85, for example, in the transverse direction. The first attachment portion 125 is electrically separated from the first conductive path 120. In this case, for example, an electrically conductive layer in the first fastening section 125 can be dispensed with. It is of course also possible for conductive material to be provided in the first fastening section 125.The first fastening section 125 furthermore has 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.In the embodiment, for example, the first fixing portion 125 is disposed on the opposite side to the first contact arm 95 in the transverse direction. Furthermore, the first fastening portion 125 is arranged between the two first contact arms 95 of the first arm arrangement 90 in the longitudinal direction.The alignment section 130 can be arranged on the first base section 85 opposite in the transverse direction and, for example, at the same height as the first fastening section 125 in the longitudinal direction, wherein the first alignment section 130 has, for example, a first alignment receptacle 145 which, in the 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 dispensed with.The first alignment section 130 is, for example, of tab-shaped design and adjoins the first base section 85 with a third fixed end 149 and extends away from the first base section 85, for example in the transverse direction, from the third fixed end 149. In this case, the first alignment section 130 can likewise be arranged between two first contact arms 95 in the longitudinal direction and can be arranged at a distance from the two first contact arms 95.FIG. 4 shows a plan view of the second flexible printed circuit board 80 of the battery busbar system 15 shown in FIGS. 1 and 2.The second flexible circuit board 80 includes a second base portion 150 and a second arm assembly 155. The second base section 150 extends substantially along the x-axis and is arranged below the first base section 85 in the mounted state of the battery busbar system 15 in the z-direction. The second base section 150 may have substantially the same extension in the transverse direction as the first base section 85 and may be oriented parallel to the first base section 85.The second arm assembly 155 includes at least one second contact arm 160. In the embodiment, a plurality of second contact arms 160 are provided, which are offset with respect to one another in the x direction, in each case at a fourth fixed end 165 on the second base section 150. At this time, from the fourth fixed end 165, the second contact arms 160 extend away from the second base portion 150 in the same transverse direction from the second base portion 150. In this case, the number of second contact arms 160 can be different from a number of first contact arms 95.In each case at a second free end 170 of the second contact arm 160, the second contact arm 160 is electrically and mechanically connected, for example soldered, to an associated second printed circuit board termination section 116 of the second plate element 115. The second plate element 115 is in turn electrically and mechanically connected, for example connected in a materially bonded manner, for example welded or soldered, to the associated second cell connector 50 (not shown in FIG. 4 ) on a transverse side facing away from the second contact arm 160 with the second cell connector connection section 117.The second flexible printed circuit board 80 has at least one second conductor track 175, wherein the second conductor track 175 extends in each case via the second contact arm 160 and the second base section 150 toward the contact device 60. In this case, the second conductor track 175 electrically connects the contact device 60 to the associated second plate element 115. The second conductor tracks 175 can be guided in parallel offset to one another in the transverse direction within the second base section 150.Furthermore, analogously to the first flexible printed circuit board 75, the second flexible printed circuit board 80 can have a second fastening section 180 and / or a second alignment section 185. The second fastening portion 180 can be formed identically to the first fastening portion 125, for example.In this case, the second fastening portion 180 on the side of the second base portion 150 opposite the second contact arms 160 in the transverse direction can be connected to the second base portion 150 with a fifth fixed end 181 and can extend away from the second base portion 150 in the transverse direction. The second fastening portion 180 has a second fastening receptacle 182, which preferably extends completely through the second fastening portion 180 in the z direction. The second fastening receptacle 182 can be formed geometrically identically to the first fastening receptacle 140.Opposite in the transverse direction and, for example, at the same height as the second fastening portion 180 in the x direction, the second alignment portion 185 can be arranged on the second base portion 150. The second alignment section 185 is, for example, of tab-shaped design and extends away from the second base section 150 starting from a sixth fixed end 191. At the sixth fixed end 191, the second aligning portion 185 is fixed to the second base portion 150.The second alignment section 185 has a second alignment receptacle 190 which extends preferably completely through the second alignment section 185 in the z direction. Both the second mounting portion 180 and the second alignment portion 185 may be formed of substrate material of the second flexible circuit board 80. Furthermore, the second alignment portion 185 and / or the second attachment portion 180 are electrically separated from the second conductive path 175.The second alignment receptacle 190 can preferably be formed identically to the first alignment receptacle 145. In the embodiment, for example, the second alignment portion 185 is disposed between two second contact arms 160.In the mounted state of the first printed circuit board 75 and the second printed circuit board 80 one above the other in the stack in the z direction, the first fastening receptacle 140 and the second fastening receptacle 182 (cf. FIG. 2 ) are aligned with one another. In this case, a fastening element 195 of the carrier 70 can pass through the first fastening receptacle 140 and the second fastening receptacle 182 and fasten the first and second flexible printed circuit boards 75, 80 to the carrier 70, preferably at a defined distance from one another.Furthermore, an alignment element 200 (cf. FIG. 2 ) can pass through the first alignment receptacle 145 and the second alignment receptacle 190 in the z direction. The alignment element 200 serves to fasten the first and second flexible circuit boards 75, 80 to one another during transport of the first and second flexible circuit boards 75, 80 and, in the mounted state on the carrier 70, defines the first and second flexible circuit boards 75, 80 in both the x and y directions and around the z axis, such that the first and second flexible circuit boards 75, 80 are arranged one above the other in the stack. The alignment element 200 can be formed as a separate component from the carrier 70 or part of the carrier 70.FIG. 5 shows a side view of the battery busbar system 15 shown in FIGS. 1, 2, 3 to 4.Clearly, the offset in the z-direction of the first and second flexible printed circuit boards 75, 80 is shown in FIG. 5. In this case, in the embodiment, for example, the carrier 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 this case, the carrier 70 is arranged above the energy storage cell arrangement 20 and below the printed circuit board arrangement 55 in the z direction. Further, above the substrate 70, the second flexible circuit board 80 is first disposed. By the fastening element 195, the first flexible printed circuit board 75 can be arranged above the second flexible printed circuit board 80 at a distance from the second flexible printed circuit board 80 by a gap 205. The gap 205 disposed between the first flexible circuit board 75 and the second flexible circuit board 80 prevents the first flexible circuit board 75 from scrubbing the second flexible circuit board 80.In the embodiment, the first base portion 85 extends in the first plane 210 which is formed as an xy plane, for example. The second base portion 150 extends in a second plane 215 that is oriented parallel to the first plane 210. The connection poles 35, 40 of the energy storage cells 25, 30 can be arranged, for example, in each case in a third plane 220, wherein the third plane 220 is also oriented parallel to the first and second planes 210, 215.FIG. 6 shows a sectional view along a sectional plane A-A shown in FIG. 5 through the battery busbar system 15 shown in FIG. 5.The first contact arm 95 can have an S- or Z-shaped profile in section, wherein the first contact arm 95 protrudes 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 protrudes with the first free end 105 on a side facing away from the electrical energy store 10. In this case, the first plate element 110 can electrically contact the first conductor track 120 with the first printed circuit board connection section 111 on the upper side on the first contact arm 95.In the z-direction toward the energy storage cell arrangement 20, the second flexible printed circuit board 80 is arranged starting from the first flexible printed circuit board 75. The gap 205 between the first flexible printed circuit board 75 and the second flexible printed circuit board 80 can be clearly seen in FIG. 6.By way of example, the second contact arm 160 also protrudes from the second plane 215 in which the second base section 150 extends. In this case, on the upper side of the second contact arm 160, the second plate element 115 can be electrically and mechanically connected to the second contact arm 160. The second contact arm 160 can be formed in an S-shaped or Z-shaped manner in the sectional plane A-A.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 formed to be particularly narrow in the transverse direction. This provides good accessibility in the z direction from above to a large part of the electrical energy storage cells 25, 30 and to the cell connectors 45, 50, so that even in the case of narrow installation space requirements, in particular in the transverse direction, the flexible printed circuit boards 75, 80 arranged in the stack provide a reliable connection of the respectively joined electrical energy storage cells 25, 30.The flexible printed circuit boards 75, 80 arranged in the stack can, for example, respectively ensure voltage taps via the first and second conductor tracks 120, 175, which taps can be evaluated by the battery management system via the contact device 60.Furthermore, the offset of the contact arms 95, 160 in the longitudinal direction makes it possible to contact individual rows of energy storage cells 25, 30, which are connected in parallel by the cell connector 45, 50, in each case, a first part of the cell connectors 45, 50 being electrically connected to the contact device 60 via the first flexible printed circuit board 75 and a second part of the cell connectors 45, 50 being electrically connected to the contact device 60 by means of the second flexible printed circuit board 80.Furthermore, the above-described configuration ensures that the battery busbar system 15 can be produced particularly simply and cost-effectively. In particular, the first and second plate elements 110, 115 can be identical in design, for example.Furthermore, the energy storage cell arrangement 20 can have a particularly large number of electrical energy storage cells 25, 30. Furthermore, for example, a further flexible printed circuit board can additionally be arranged on the stack of flexible printed circuit boards 75, 80 in order 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.FIG. 7 shows a detail of a plan view of a battery busbar system 15 according to a second embodiment.The battery busbar system 15 is substantially identical to the battery busbar system 15 shown in FIGS. 1, 2, 3, 4, 5 to 6. Only the differences of the battery busbar system 15 according to the second embodiment shown in FIG. 7 from the battery busbar system 15 according to the first embodiment shown in FIGS. 1, 2, 3, 4, 5 to 6 will be discussed below.In the exemplary embodiment, the first flexible printed circuit board 75, which is arranged on a side facing away from the energy storage cell arrangement 20, is embodied to be shortened in the longitudinal direction, for example, in comparison with the second flexible printed circuit board 80.In the embodiment, for example, one of the two cell connectors 45, 50, for example, the second cell connector 50 in FIG. 7, has a third plate element 225.The third plate element 225 is substantially a combination of the first plate element 110 and the second plate element 115. The third plate member 225 includes both the first circuit board connection portion 111 and the second circuit board connection portion 116. The first printed circuit board connection section 111 and the second printed circuit board connection section are arranged offset with respect to one another in the longitudinal direction. The first contact arm 95 is electrically connected to the first circuit board terminal portion 111. The second contact arm 160 is electrically connected to the second circuit board terminal portion 116.In the plan view of the third plate element 225 shown in FIG. 7, the third plate element 225 is V-shaped. The third plate member 225 includes either the second cell connector terminal portion 117 shown in FIG. 7 or the first cell connector terminal portion 112. In FIG. 7, the third plate member 225 is in electrical contact with the second cell connector 50 via the second cell connector terminal portion 117.Alternatively, it is also possible for the third plate element to make electrical contact with the first cell connector connection portion 112 (instead of the second cell connector connection portion 117), the first cell connector 45.The configuration shown in FIG. 7 has the advantage that the first flexible printed circuit board 75 can be formed to be shortened and the first conductor track 120 of the first flexible printed 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.List of reference characters10 Electrical energy store 15 Battery busbar system 20 Energy store cell arrangement 25 First energy store cell 30 Second energy store cell 35 First terminal pole (of the first energy store cell) 40 Third terminal pole (of the second energy store cell) 45 First cell connector 46 Cell connector arrangement 50 Second cell connector 55 Printed circuit board arrangement 60 Contact device 65 Plate element arrangement 70 Carrier 75 First flexible printed circuit board 80 Second flexible printed circuit board 85 First base 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 printed circuit board terminal section 112 First cell connector terminal section 115 Second plate element 116 Second printed circuit board terminal section 117 Second cell connector terminal section 120 First conductor track 125 First fastening section 130 First alignment section 135 Second fixed end (of the first fastening section) 140 First fastening receptacle 145 First alignment receptacle 149 Third fixed contact The alignment element of the second alignment element is shown as having a second alignment portion (of the first alignment portion) 150 second base portion 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 conductive path 180 second fixing portion 181 fifth fixed end (of the second fixing portion) 182 second fixing receptacle 185 second alignment portion 191 sixth fixed end (of the second alignment portion) 190 second alignment receptacle 195 fixing element 200 alignment element 205 gap 210 first plane 215 second plane 220 third plane 225 third plate element

Claims

Battery busbar system (15) for an electrical energy store (10) of a vehicle, - wherein the battery busbar system (15) has a printed circuit board arrangement (55) and a cell connector arrangement (46), - wherein the printed circuit board arrangement (55) has at least a first flexible printed circuit board (75) and a second flexible printed circuit board (80), - wherein the cell connector arrangement (46) has 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) can be electrically connected to at least a first energy storage cell (25) of an energy storage cell arrangement (20) of the electrical energy store (10) and the second cell connector (50) can be electrically connected to at least a second energy storage cell (30) of the energy storage cell arrangement (20) of the electrical energy store (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 in sections in a stack, - 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 substantially parallel to the second base section (150), wherein the first flexible printed circuit board (75) has a first arm arrangement (90) having at least one first contact arm (95) and the second flexible printed circuit board (80) has a second arm arrangement (155) having at least one second contact arm (160), - wherein the first contact arm (95) adjoins 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) adjoins 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 from the first contact arm (95) along the first axis (x).Battery busbar system (15) according to Claim 1, - wherein a gap (205) is arranged between the first base section (85) and the second base section (150), - or - wherein the first base section (85) bears directly against the second base section (150).Battery busbar system (15) according to one of the preceding claims, - wherein the first arm arrangement (90) has at least two first contact arms (95) which are arranged offset along the first axis (x) and are each connected to the first base section (85) by the first fixed end (100), - wherein the second contact arm (150) is arranged between the two first contact arms (95) along the first axis.Battery busbar system (15) according to one of the preceding claims, - wherein the first flexible printed circuit board (75) has a first fastening portion (125) and the second flexible printed circuit board (80) has a second fastening portion (180), - wherein the first fastening portion (125) is tab-shaped and has a first fastening receptacle (140), - wherein the first fastening portion (125) is fastened to the first base portion (85) and extends away from the first base portion (85), - wherein the second fastening portion (180) is tab-shaped and has a second fastening receptacle (182), - wherein the second fastening portion (180) is fastened to the second base portion (150) and extends away from the second base portion (150), - wherein the first fastening receptacle (140) and the second fastening receptacle (182) are arranged overlapping.Battery busbar system (15) according to Claim 4, - 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).The battery busbar system (15) according to any one of the preceding claims, - comprising a carrier (70), - wherein the first flexible printed circuit board (75) and the second flexible printed circuit board (80) are fastened to the carrier (70) in the stack.The battery busbar system (15) according to any one of the preceding claims, - 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 tab-shaped and has a first alignment receptacle (145), - wherein the first alignment section (130) is fastened to the first base section (85) and extends away from the first base section (85), - wherein the second alignment section (185) is tab-shaped and has a second alignment receptacle (190), - wherein the second alignment section (185) is fastened to the second base section (150) and extends away from the second base section (150), - wherein the first alignment receptacle (145) and the second alignment receptacle (190) are arranged overlapping.Electrical energy store (10) for an electric vehicle, - wherein the electrical energy store (10) has an energy store cell arrangement (20) and a battery bus bar system (15) according to one of the preceding claims, - wherein the energy store cell arrangement (20) has at least one first energy store cell (25) and a second energy store cell (30) arranged offset from the first energy store cell (25), - wherein the first cell connector (45) is electrically and mechanically connected to a first connection pole (35) of the first energy store cell (25) and the second cell connector (50) is electrically and mechanically connected to a third connection pole (40) of the second energy store cell (30).Electrical energy store (10) according to Claim 8, - wherein the first connection pole (35) and the third connection 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 in sections parallel to the third plane (215).

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