BATTERY BUSBAR SYSTEM, METHOD FOR ASSEMBLING THE BATTERY BUSBAR SYSTEM, ELECTRICAL ENERGY STORAGE AND METHOD FOR MANUFACTURING THE ELECTRICAL ENERGY STORAGE

Abstract

The invention relates to a battery busbar system (15), a method for assembling the battery busbar system (10), an electrical energy storage device, and a method for manufacturing the electrical energy storage device, wherein the battery busbar system (15) comprises a cell connector (55), a flexible printed circuit board (60) with a conductor track (80), a contact device (65), a spring element (155), and at least one temperature sensor (160), wherein the flexible printed circuit board (60) comprises a base section (100) and an arm section (105) arranged on the base section (100), wherein the ribbon-shaped arm section (105) comprises a contact section (140) and a substantially curved shaped section (135) adjoining the base section (100), wherein the temperature sensor (160) is arranged on the contact section (140), and the conductor track (80) extends over the arm section (105) and the base section (100).wherein the contact device (65) is arranged on the base section (100) and the conductor track (80) electrically connects the temperature sensor (160) to the contact device (65), wherein the cell connector (55) is arranged in a stacked manner between the application section (140) and the base section (100) and the spring element (155) is arranged between the application section (140) and the intermediate section (95), wherein the spring element (155) provides a clamping force (FS) when clamped.

Description

[0001] The invention relates to a battery busbar system according to claim 1, a method for assembling the battery busbar system according to claim 9, an electrical energy storage device according to claim 10 and a method for manufacturing the electrical energy storage device according to claim 11.

[0002] From EP 3 565 022 B1 a flexible printed circuit board and a carrier device for an electrical energy storage device are known.

[0003] Furthermore, a measuring device for an electrical energy storage device and an electrical energy storage device with the measuring device are known from DE 10 2023 111 286 A1.

[0004] Furthermore, CN 2 07 183 388 U shows a battery module that includes a variety of batteries, a variety of electrically connecting films and an FPC.

[0005] The object of the invention is to provide an improved battery busbar system, an improved method for assembling the battery busbar system, an improved electrical energy storage device and an improved method for manufacturing the electrical energy storage device.

[0006] This problem is solved by means of a battery busbar system according to claim 1, a method for assembling the battery busbar system according to claim 9, an electrical energy storage device according to claim 10, and a method for manufacturing the electrical energy storage device according to claim 11. Advantageous embodiments are specified in the dependent claims.

[0007] It was recognized that an improved battery busbar system for a vehicle's electrical energy storage system can be provided by comprising at least one cell connector arrangement with at least one cell connector, a flexible printed circuit board with at least one conductor arrangement with at least one conductor track, a contact device, a spring element, and at least one temperature sensor. The flexible printed circuit board has a base section and an arm section arranged on and extending away from the base section. The ribbon-shaped arm section has a contact section, for example, substantially plate-shaped, and a substantially curved forming section adjoining the base section. The temperature sensor is arranged on the contact section, and the conductor track extends over the arm section and the base section.The conductor track electrically connects the temperature sensor to the contact device. The contact device is arranged on the base section. Furthermore, the base section and at least one intermediate section of the cell connector can be arranged parallel to and offset from each other. The cell connector is arranged in a stacked fashion between the contact section and the base section, and the spring element is arranged between the contact section and the intermediate section. The spring element is configured to provide a clamping force when tensioned, and the intermediate section is configured to provide a counterforce to the clamping force, with the spring element being configured to use the clamping force to push the contact section away from the cell connector.

[0008] This design has the advantage that, due to the stacked configuration of the battery busbar system, it is particularly suitable for energy storage cell arrangements with a high number of energy storage cells in a small space, especially for electrical energy storage cell arrangements with cylindrical cells. The spring element ensures reliable contact of the temperature sensor, allowing the battery busbar system to reliably provide information about the temperature measured by the temperature sensor at the contact device.

[0009] In a further embodiment, the forming section is arc-shaped, in particular U-shaped, and extends from a fixed end of the arm section between the contact section and the base section around the intermediate section. This design has the advantage that the arc-shaped, in particular U-shaped, design prevents a kink in the flexible printed circuit board and thus ensures a long service life for the flexible printed circuit board even under large temperature fluctuations and therefore a large pivoting movement of the arm section.

[0010] In a further embodiment, the spring element is connected on one side to the intermediate section and on the other side to the contact section. On a side facing away from the cell connector, the contact section has a battery contact surface for thermal contact with an energy storage cell of the electrical energy storage system. The temperature sensor is arranged on a side of the contact section facing the cell connector and is thermally connected to the battery contact surface. This design has the advantage that the battery contact surface can be flat, thus ensuring good, even contact between the battery contact surface and the associated electrical energy storage cell.

[0011] In a further embodiment, the system section, the intermediate section, and the base section have at least partial overlap along an axis. The axis is inclined, preferably perpendicular, to the intermediate section. The overlap has the advantage of ensuring the stacked configuration and thus allowing the battery busbar system to be particularly compact in spatial directions perpendicular to the mounting axis.

[0012] In a further embodiment, the arm section is connected to the base section at a fixed end, the base section extending substantially in a first plane. The attachment section extends substantially in a second plane and is preferably aligned parallel to the base section.

[0013] In a further embodiment, the intermediate section of the cell connector is ribbon-shaped and extends essentially along a first principal direction. The arm section extends essentially along a second principal direction, the second principal direction being inclined, in particular perpendicular, to the first principal direction. This design has the advantage that the arm section can be guided laterally in an arc, in particular in a U-shape, around the cell connector. This prevents collisions with the cell connector and thus avoids potential wear or friction of the arm section against the cell connector. This ensures a long service life.

[0014] In another embodiment, the base section has a recess, with the arm section protruding from the recess. The recess essentially follows a flattened shape of the arm section. This design has the advantage that the arm section and the base section can be manufactured from a blank of the flexible printed circuit board extending in the first plane.

[0015] In a further embodiment, the spring element is at least partially hollow, with the spring element arranged circumferentially around the temperature sensor. This allows the spring element to enclose the temperature sensor and preferably seal it fluid-tight against the sensor's surroundings.

[0016] An improved method for assembling the battery busbar system described above can be provided by supplying the cell connector assembly with at least the cell connector, the flexible printed circuit board, the contact device, the spring element, and the temperature sensor. The contact device and the temperature sensor are arranged on the flexible printed circuit board. The spring element is arranged on the contact section of the arm section. The flexible printed circuit board is arranged on the cell connector assembly such that the base section is offset and parallel to the intermediate section. The arm section is bent around the cell connector from the base section in the forming section such that the spring element is arranged between the contact section and the intermediate section of the cell connector, and the intermediate section is arranged between the base section and the spring element.This design has the advantage that, by bending the arm section out of the base section, the material requirement for the production of the flexible printed circuit board with the base section and the arm section is particularly low.

[0017] An improved electrical energy storage system for a vehicle can be provided by comprising the battery busbar system described above and an energy storage cell arrangement with at least one first energy storage cell and a second energy storage cell arranged offset from the first. The battery busbar system is arranged on the energy storage cell arrangement. The cell connector is electrically connected at a first connection section to a terminal of the first energy storage cell and at a second connection section to a terminal of the second energy storage cell. The intermediate section connects the first connection section to the second connection section both electrically and mechanically.The spring element uses its tension force to press the assembly section against the first energy storage cell, and the temperature sensor is thermally connected to the first energy storage cell. This allows the temperature of the first energy storage cell to be measured during operation of the electrical energy storage system, and information about the temperature of the first energy storage cell is provided to the contact device. Based on this information, a battery management system can control the charging and / or discharging of the energy storage cell assembly.

[0018] An improved method for manufacturing the electrical energy storage device can be provided by using the battery busbar system described above to provide an energy storage cell assembly with the first energy storage cell and the second energy storage cell, which is offset from the first. The battery busbar system is mounted along an axis on the energy storage cell assembly. The cell connector is electrically connected at the first connection section to the terminal of the first energy storage cell and at the second connection section to the terminal of the second energy storage cell. The spring element is tensioned between the intermediate section and the first energy storage cell such that the spring force presses the assembly section against the first energy storage cell, thermally connecting the temperature sensor to the first energy storage cell.

[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; Fig. 2 a perspective view of a section of the in Fig. 1 electrical energy storage device shown; Fig. 3 one in Fig. 1 marked section A of the in Fig. 1 electrical energy storage device shown; Fig. 4 one in Fig. 3 marked section C of the in Fig. 3 battery busbar systems shown; Fig. 5 a semi-transparent representation of the in Fig. 4 shown section C; Fig. 6 a sectional view along a Fig. Section BB shown in section 3 through the in Fig. 3 battery busbar systems shown; Fig. 7 a flowchart of a procedure for assembling the in the Fig. Battery busbar system shown in 1 to 6; Fig. 8 a top view of a section of a battery busbar system during a third process step; Fig. 9 a flowchart of a process for producing the in the Fig. 1 to 6 of the electrical energy storage devices shown; and Fig. 10 a schematic representation of the electrical energy storage during a seventh process step.

[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.

[0022] The electrical energy storage device 10 can, for example, be designed as a traction battery for an electrically powered vehicle, in particular a fully electric vehicle or a hybrid vehicle. The in Fig. The electrical energy storage device 10 shown can also be just one module or one block of a larger electrical energy storage device 10 or the traction battery.

[0023] The electrical energy storage device 10 comprises a battery busbar system 15 and an energy storage cell arrangement 20. The energy storage cell arrangement 20 comprises at least one first energy storage cell 25 and a second energy storage cell 30, which is arranged offset from the first energy storage cell 25. For the sake of clarity, in Fig. 1 only a part of the energy storage cells 25, 30 of the energy storage cell arrangement 20 are shown.

[0024] The electrical energy storage cell 25, 30 can, for example, be designed as a lithium-ion or lithium iron phosphate cell. Of course, the energy storage cell 25, 30 can also be designed in other ways. Fig. For example, the energy storage cell 25, 30 is configured as a cylindrical cell. It is also possible that the energy storage cell 25, 30 has a different geometric shape and is configured, for example, as a prismatic cell or a punch cell. It should be noted that the energy storage cell 25, 30 can be configured differently with regard to both its geometric design and its chemical composition.

[0025] Each of the energy storage cells 25, 30 has a first terminal 35 and a second terminal 40. The first terminal 35 can, for example, be configured as the positive terminal and the second terminal 40 as the negative terminal of the respective energy storage cell 25, 30. In this embodiment, for example, the first terminal 35 and the second terminal 40 are arranged on the end face of the energy storage cell 25, 30 facing the battery busbar system 15. The first terminal 35 and the second terminal 40 are each arranged on a battery side surface 45 of the respective energy storage cell 25, 30. The battery side surface 45 can be stepped at the respective terminals 35, 40. Alternatively, the battery side surface 45 can, for example, extend substantially in an xy-plane.

[0026] The first terminal 35 and the second terminal 40 serve to connect the respective energy storage cell 25, 30 to the respective other energy storage cell 25, 30 in a power-electrical manner. Electrical energy stored in the energy storage cell 25, 30 is thereby released via the first terminal 35 and the second terminal 40, or the respective energy storage cell 25, 30 is charged via the first and second terminal 35, 40.

[0027] The battery busbar system 15 includes, by way of example, a cell connector arrangement 50 with at least one cell connector 55, a flexible printed circuit board 60, and a contact device 65. The contact device 65 is arranged on the flexible printed circuit board 60. The contact device 65 can be mechanically connected to a carrier layer 70 of the flexible printed circuit board 60.

[0028] The flexible printed circuit board 60 has, in addition to the carrier layer 70, a conductor arrangement 75 which is arranged on the carrier layer 70. The conductor arrangement 75 has at least one conductor 80, wherein the conductor 80 is electrically conductive. The conductor 80 is electrically contacted at one end by the contact device 65.

[0029] Besides the in Fig. The conductor arrangement 75 can also include further conductors, which are shown schematically as an example in 1 conductor track 80, for the sake of clarity in Fig. 1 are not shown.

[0030] The flexible printed circuit board 60 can be single-layered or multi-layered. The flexible printed circuit board 60 is also referred to as a flexible printed circuit. The flexible printed circuit board 60, in particular the substrate layer 70, can be reversibly bent non-destructively with low force through an angle of 30° to 300° inclusive, preferably at least 100 to 10,000 times.

[0031] In this embodiment, the conductor track arrangement 75 is preferably arranged on one side facing the energy storage cell arrangement 20.

[0032] Furthermore, the carrier layer 70 can be mechanically connected to the cell connector arrangement 50, in particular the cell connector 55, especially by a material bond.

[0033] In this embodiment, the cell connector 55 is exemplarily designed as a ribbon and comprises a first connection section 85, a second connection section 90 arranged offset from the first connection section 85, and an intermediate section 95. The intermediate section 95 connects the first connection section 85 to the second connection section 90. In this embodiment, for example, the intermediate section 95 is designed to extend essentially in an xy-plane. The shape of the intermediate section 95 can be freely chosen. Fig. 1, for example, the intermediate section 95 is L-shaped, although other configurations are also possible.

[0034] At the first connection section 85, the cell connector 55 is electrically and mechanically connected to the first energy storage cell 25, and at the second connection section 90, the cell connector 55 is electrically and mechanically connected to the second energy storage cell 30.

[0035] In this embodiment, the cell connector 55 connects the first energy storage cell 25 to the second energy storage cell 30 in parallel. Of course, it is also possible for the cell connector 55 to connect the first energy storage cell 25 to the second energy storage cell 30 in series or in series-parallel.

[0036] The cell connector arrangement 50 is preferably arranged in the z-direction between the battery side surface 45 and the flexible circuit board 60.

[0037] The flexible printed circuit board 60 has a base section 100 and an arm section 105. The base section 100 is essentially plate-shaped and extends in a first plane 110. In this embodiment, the first plane 110 is essentially configured as an xy plane. One or more battery recesses 116 can be arranged in the base section 100, each battery recess 116 being aligned with the respective energy storage cell 25, 30. The battery recess 116 can, for example, have a recess contour that is essentially corresponding to a shell contour of the respective aligned energy storage cell 25, 30.

[0038] Fig. Figure 2 shows a perspective view of a section of the Fig. 1 shown electrical energy storage device 10.

[0039] On one side facing the flexible printed circuit board 60, the intermediate section 95 has at least one connection area 170, wherein the cell connector 55 is mechanically connected to the substrate layer 70 of the flexible printed circuit board 60 at the connection area 170. The connection can, for example, be a metallurgical connection, in particular a welded connection. In particular, the substrate layer 70 of the flexible printed circuit board 60 can be laser-welded or ultrasonically welded to the connection area 170 of the intermediate section 95.

[0040] During operation of the electrical energy storage device 10, for example during charging or discharging with electrical energy via the battery connection 75, 80, an operating parameter changes, for example a cell voltage and / or a cell temperature of the energy storage cell 25, 30. In particular, during a fast charging process of the energy storage cell arrangement 20, the energy storage cells 25, 30 heat up considerably.In order to optimally charge or discharge the energy storage cell 25, 30, and to avoid charging or discharging with excessive electrical power, a battery management system (not shown) monitors the cell voltage of the energy storage cell 25, 30 and preferably the cell temperature of the energy storage cell arrangement 20, and controls, for example, the fast charging process, in order to avoid damage and / or destruction of the energy storage cell 25, 30 of the electrical energy storage device 10.

[0041] Furthermore, the geometric extent of the energy storage cell 25, 30, especially in the z-direction, changes due to temperature.

[0042] Fig. 3 shows one in Fig. 1 marked section A of the in Fig. 1 shown electrical energy storage device 10.

[0043] In Fig. For the sake of clarity, the representation of the energy storage cell arrangement 20 is omitted in Figure 3.

[0044] The arm section 105 is ribbon-shaped and projects out from the first plane 110, in which the base section 100 extends. The arm section 105, for example, has an essentially U-shaped basic form and is bent around the intermediate section 95 in such a way that the arm section 105 is formed at a distance from the intermediate section 95.

[0045] In this embodiment, the intermediate section 95 extends along the arm section 105 along a first principal extension direction 115, which in Fig. 3 is indicated by a dashed line. The first principal extension direction 115 can be essentially parallel to the y-axis.

[0046] The arm section 105 is ribbon-shaped and has, for example, a substantially identical width b in the y-direction. The width b is smaller than a maximum length of the arm section 105, which specifies a second principal extension direction 120 of the arm section 105.

[0047] The second principal extension direction 120 forms an angle α with the first principal extension direction 115, such that the second principal extension direction 120 is inclined to the first principal extension direction 115. In particular, for example, the second principal extension direction 120 can be perpendicular to the first principal extension direction 115.

[0048] Fig. 4 shows one in Fig. 3 marked section C of the in Fig. 3 shown battery busbar system 15.

[0049] The arm section 105 is connected at a fixed end 125 to the base section 100 of the flexible printed circuit board 60. Adjacent to the fixed end 125, for example, a recess 130 is arranged in the base section 100, which is shaped as a kind of elongated hole and essentially has a recess contour corresponding to a flattened shape of the arm section 105. In other words, when the battery busbar system 15 is disassembled, the arm section 105 can be inserted into the recess 130, so that both the base section 100 and the arm section 105 are arranged in the first plane 110.

[0050] The arm section 105 has a shaping section 135 and a fitting section 140.

[0051] The formed section 135 of the arm section 105 is arranged following the fixed end 125, wherein the formed section 135 is essentially U-shaped or curved. The formed section 135 can, for example, be curved around approximately 180° and project out of the first plane 110 in the direction of the energy storage cell arrangement 20. The formed section 135 is curved such that it is bent around the intermediate section 95 and is positioned closer to the energy storage cell arrangement 20 than the intermediate section 95.

[0052] The system section 140 adjoins the molded section 135 on a side facing away from the fixed end 125 and can extend in a second plane 145. The second plane 145 is, for example, aligned parallel to the first plane 110, so that the second plane 145 is also designed as an xy plane.

[0053] The system section 140 has a battery mounting surface 150, wherein the battery mounting surface 150 is preferably substantially planar. The battery mounting surface 150 can be arranged on a side of the system section 140 facing away from the intermediate section 95 and the base section 100.

[0054] In the assembled state of the battery busbar system 15 on the energy storage cell arrangement 20, the battery mounting surface 150 preferably rests against the first energy storage cell 25, in particular against the battery side surface 45, and can be thermally connected to the battery side surface 45.

[0055] The base section 100, the intermediate section 95, and the attachment section 140 are arranged stacked at intervals along the z-direction. The attachment section 140, the intermediate section 95, and the base section 100 overlap in the z-direction. An overlap in the z-direction is defined as the projection of at least two components—in this embodiment, for example, the intermediate section 95, the attachment section 140, and the base section 100—along the z-axis into a projection plane (for example, an xy-plane) oriented perpendicular to the projection direction. In this projection plane, the components, for example, the base section 100, the intermediate section 95, and the attachment section 140, overlap.

[0056] Furthermore, the battery busbar system 15 comprises a spring element 155 and preferably a temperature sensor 160. The temperature sensor 160 is arranged on the system section 140, preferably on a side facing the intermediate section 95. The temperature sensor 160 is thermally connected to the battery mounting surface 150 via the system section 140. It is also possible for the temperature sensor 160 to be arranged on the battery mounting surface 150.

[0057] The spring element 155 is also arranged between the intermediate section 95 and the mounting section 140. The spring element 155 is preferably bonded to the mounting section 140, for example by adhesive bonding. The spring element 155 is preferably arranged circumferentially around the temperature sensor 160.

[0058] In the z-direction opposite, the spring element 155 rests against the intermediate section 95.

[0059] The spring element 155 can, for example, be made of a foam material. Of course, it is also possible that the spring element 155 has a different design.

[0060] When the battery busbar system 15 is mounted on the energy storage cell arrangement 20, the spring element 155 is tensioned and thus points in relation to the Fig. The embodiment shown in Figure 4 has a shorter extension in the z-direction.

[0061] In its tensioned state, the spring element 155 provides a tension force FS that acts along the z-axis in the direction of the energy storage cell arrangement 20. On the side facing the intermediate section 95, the spring element 155 is supported by the intermediate section 95, with the cell connector 55 providing a counterforce FG on the intermediate section 95.

[0062] The counterforce FG causes the clamping force FS to act in the direction of the energy storage cell arrangement 20, thus pushing the spring element 155 away from the cell connector 55 and pressing it against the respective associated battery side surface 45 in the assembled state to ensure a secure thermal contact between the battery side surface 150 and the respective battery side surface 45.

[0063] This design has the advantage that even with thermal expansion or contraction of the energy storage cell 25, 30, the system section 140 remains reliably in contact with the battery mounting surface 150, thus ensuring secure thermal contact between the battery mounting surface 150 and the respective energy storage cell 25, 30. This thermal connection and coupling of the temperature sensor 160 to the battery mounting surface 150 allows the temperature sensor 160 to reliably and quickly detect the temperature of the battery side surface 45.

[0064] Fig. 5 shows a semi-transparent representation of the in Fig. 4 shown excerpt C.

[0065] This includes in Fig. 5 hidden lines are shown as dashed lines.

[0066] The conductor track 80 extends over the base section 100, the shaped section 135 and the mounting section 140 to the temperature sensor 160 and electrically connects the temperature sensor 160 to the contact device 65. It should be noted that in Fig. Figure 5 shows only one possible routing of the conductor track 80 to connect the temperature sensor 160 to the contact device 65. Of course, several conductor tracks 80, in particular at least two conductor tracks 80, can be provided to connect the temperature sensor 160 to the contact device 65 via the arm section 105 and the base section 100.

[0067] In this embodiment, the spring element 155 is, for example, designed as a hollow body and surrounds the temperature sensor 160 on its circumference.

[0068] Preferably, the spring element 155 rests flat against the intermediate section 95 and internally defines a spring element chamber 165, in which the temperature sensor 160 is enclosed. Preferably, the spring element 155 is also bonded to the intermediate section 95 in a material-bonded manner to seal the spring element chamber 165 fluid-tight from the surrounding environment.

[0069] Fig. Figure 6 shows a sectional view along a [unclear] in Fig. Section BB shown in section 3 through the in Fig. 3 shown battery busbar system 15.

[0070] Additionally, in Fig. 6 the first energy storage cell 25 of the energy storage cell arrangement 20 arranged.

[0071] As mentioned above, the spring element 155 presses the battery mounting surface 150 at mounting section 140 against the battery side surface 45, thus ensuring good thermal contact between the temperature sensor 160 and the associated battery side surface 45. Since the cell connector 55 is electrically and mechanically connected to the energy storage cell 25, 30 at both the first connection section 85 and the second connection section 90, it is particularly advantageous if the arm section 105 is bent around the cell connector 55 near the respective connection section 85, 90. This allows the mounting section 140 with the temperature sensor 160 to be pressed against the energy storage cell 25, 30, and the temperature of the respective energy storage cell 25, 30 to be measured during operation of the electrical energy storage device 10.

[0072] Fig. Figure 7 shows a flowchart of a procedure for assembling the component in the Fig. Battery busbar system 1 to 6 shown 15. Fig. Figure 8 shows a top view of a section of a battery busbar system 15 during a third process step 215.

[0073] In a first process step 205, the flexible printed circuit board 60 is provided with the base section 100 and the arm section 105 arranged on the base section 100. The arm section 105 can be inserted into the recess 130, so that in the first process step 205 both the arm section 105 and the base section 100 extend in the first plane 110. For example, the arm section 105 and the base section 100 are provided with a one-piece, material-uniform carrier layer 70, such that the carrier layer 70 extends over the base section 100 and the arm section 105.

[0074] In the first process step 205, the flexible printed circuit board 60 is equipped with at least the contact device 65 and the temperature sensor 160, and both the contact device 65 and the temperature sensor 160 are electrically contacted with the respective conductor track 80 of the conductor track arrangement 75, so that the temperature sensor 160 is electrically connected to the contact device 65 via the conductor track arrangement 75.

[0075] In a second process step 210, the hollow-body-shaped spring element 155 is mounted on the system section 140, for example, in such a way that the spring element 155 is arranged around the temperature sensor 160 and is mechanically connected to the system section 140.

[0076] Following the second process step 210, the third process step 215 (see Fig. 8) the cell connector arrangement 50 with the cell connector 55 arranged on the base section 100.

[0077] At the connection area 170, the carrier layer 70 can be materially bonded to the cell connector 55 in a fourth process step 220. For this purpose, for example, in the fourth process step 220, which follows the third process step 215, the carrier layer 70 can be welded, laser welded or ultrasonically welded to the connection area 170.

[0078] In a fifth process step 225 following the fourth process step 220, the arm section 105 is bent out of the first plane 110 and bent around the cell connector 55 in such a way that the spring element 155 rests against the intermediate section 95 on the side facing away from the attachment section 140.

[0079] By using a contact adhesive, in the fifth process step 225 the spring element 155 can be connected to the cell connector 55 at the intermediate section 95 in a contact contact with the cell connector 55.

[0080] Fig. Figure 9 shows a flowchart of a procedure for assembling the [item] according to Fig. 7 manufactured and in the Fig. 1 to 6 shown battery busbar system 15 on the energy storage cell arrangement 20 for the production of the electrical energy storage device 10. Fig. Figure 10 shows a schematic representation of the electrical energy storage device 10 during a seventh process step 235.

[0081] In a sixth process step 230, the already manufactured battery busbar system 15 and the energy storage cell arrangement 20 are provided.

[0082] In a seventh procedural step 235 (see Fig. 10) The battery busbar system 15 is moved along the assembly axis 175, for example perpendicular to the battery side surface 45, in the direction of the energy storage cell arrangement 20 and the cell connector arrangement 50 is placed on it.

[0083] In this process, on the side of the battery busbar system 15 facing away from the energy storage cell arrangement 20, the battery busbar system 15 is pressed onto the energy storage cell arrangement 20, so that the first connection section 85 is at the first connection pole 35 of the first energy storage cell 25 and the second connection section 90 is at the second connection pole 40 of the second energy storage cell 30.

[0084] In an eighth process step 240, the first connection section 85 is mechanically and electrically connected to the associated terminal 35, 40 of the first energy storage cell 25, and the second connection section 90 is electrically and mechanically connected to the terminal 35, 40 of the second energy storage cell 30, for example by means of a welding process, in particular a laser welding or ultrasonic welding process. The battery busbar system 15 remains along the mounting axis 175 (see figure). Fig. 10) pressed.

[0085] When pressing the battery busbar system 15, the battery mounting surface 150 is placed on the battery side surface 45 and the spring element 155 is tensioned, so that the spring element 155 acts with the tension force FS against the battery side surface 45 and a secure contact with and thermal coupling of the temperature sensor 160 with the battery side surface 45 of the respective associated energy storage cell 25, 30 is ensured.

[0086] The mechanical and electrical connection of the cell connector 55 ensures that the spring element 155 can be supported on the rear side of the cell connector 55, in particular on the intermediate section 95, even over the lifetime of the electrical energy storage device 10.

[0087] After completion of the eighth process step 240, the electrical energy storage device 10 can be further assembled, however the battery busbar system 15 and the electrical energy storage cell arrangement 20 are fully assembled.

[0088] The electrical energy storage device 10 described above and the two methods for assembling the battery busbar system 15 and for manufacturing the electrical energy storage device 10 have the advantage that reliable temperature measurement is ensured during operation of the electrical energy storage device 10 and, secondly, the battery busbar system 15 and the electrical energy storage device 10 can be assembled with a few process steps. Reference symbol list 10 electrical energy storage devices 15 Battery busbar system 20 Energy storage cell arrangement 25 first energy storage cell 30 second energy storage cell 35 first terminal 40 second terminal 45 Battery side surface 50 cell connector arrangement 55 cell connectors 60 flexible printed circuit boards 65 Contact device 70 carrier layer 75 Conductor arrangement 80 conductor track 85 first connecting section 90 second connecting section 95 Intermediate section 100 Basic section 105 arm section 110 first level 115 first main extension direction 116 Battery recess 120 second main extension direction 125 fixed end of arm section 130 recess 135 Form section 140 Plant section 145 second level 150 battery system area 155 spring element 160 temperature sensor 165 spring element space 170 connection area 175 Mounting axle 205 first procedural step 210 second procedural step 215 third procedural step 220 fourth procedural step 225 fifth procedural step 230 sixth procedural step 235 seventh process step 240 eighth process step b width FS clamping force FG Counterforce α angle

Claims

Battery busbar system (15) for an electrical energy storage device (10) of a vehicle, - wherein the battery busbar system (15) comprises at least one cell connector arrangement (50) with at least one cell connector (55), a flexible printed circuit board (60) with at least one conductor arrangement (75) with at least one conductor (80), a contact device (65), a spring element (155) and at least one temperature sensor (160), - wherein the flexible printed circuit board (60) comprises a base section (100) and an arm section (105) arranged on the base section (100) and extending away from the base section (100), - wherein the ribbon-shaped arm section (105) comprises a contact section (140) and a substantially curved shaped section (135) adjoining the base section (100),- wherein the temperature sensor (160) is arranged on the system section (140) and the conductor track (80) extends over the arm section (105) and the base section (100),- wherein the contact device (65) is arranged on the base section (100) and the conductor track (80) electrically connects the temperature sensor (160) to the contact device (65),- wherein the base section (100) and at least one intermediate section (95) of the cell connector (55) are arranged parallel to each other,- wherein the cell connector (55) is arranged in a stacked manner between the system section (140) and the base section (100) and the spring element (155) is arranged between the system section (140) and the intermediate section (95),- wherein the spring element (155) is configured to provide a clamping force (FS) when clamped, and the intermediate section (95) is configured to provide a counterforce (FG) to the clamping force (FS),- wherein the spring element (155) is formed,to push the system section (140) away from the cell connector (55) using the clamping force (FS). Battery busbar system (15) according to claim 1, wherein the forming section (135) is arc-shaped, in particular U-shaped, and extends from a fixed end of the arm section (105) between the attachment section (140) and the base section (100) around the intermediate section (95). Battery busbar system (15) according to one of the preceding claims,- wherein the spring element (155) is connected on one side to the intermediate section (95) and on the other side to the mounting section (140),- wherein on a side facing away from the cell connector (55) the mounting section (140) has a battery mounting surface (150) for thermal contacting an energy storage cell (25, 30) of the electrical energy storage device (10),- wherein the temperature sensor (160) is arranged on a side of the mounting section (140) facing the cell connector (55) and is thermally connected to the battery mounting surface (150). Battery busbar system (15) according to one of the preceding claims,- wherein the system section (140), the intermediate section (95) and the base section (100) have at least a partial overlap along an axis (z),- wherein the axis (z) is inclined, preferably perpendicular, to the intermediate section (95). Battery busbar system (15) according to one of the preceding claims,- wherein the arm section (105) is connected to the base section (100) at a fixed end (125),- wherein the base section (100) extends substantially in a first plane (110),- wherein the attachment section (140) extends substantially in a second plane (145) and is preferably aligned parallel to the base section (100). Battery busbar system (15) according to one of the preceding claims,- wherein the intermediate section (95) of the cell connector (55) is ribbon-shaped and extends substantially along a first principal extension direction (115),- wherein the arm section (105) extends substantially along a second principal extension direction (120),- wherein the second principal extension direction (120) is inclined, in particular perpendicular, to the first principal extension direction (115). Battery busbar system (15) according to one of the preceding claims,- wherein the base section (100) has a recess (130),- wherein the arm section (105) projects out of the recess (130),- wherein the recess (130) substantially follows a development of the arm section (105). Battery busbar system (15) according to one of the preceding claims,- wherein the spring element (155) is designed as a hollow body at least in sections,- wherein the spring element (155) is arranged circumferentially around the temperature sensor (160). A method for assembling a battery busbar system (15) according to one of the preceding claims, wherein the cell connector arrangement (50) with at least the cell connector (55), the flexible circuit board (60), the contact device (65), the spring element (155) and the temperature sensor (160) are provided, wherein the contact device (65) and the temperature sensor (160) are arranged on the flexible circuit board (60), wherein the spring element (155) is arranged on the contact section (140) of the arm section (105), wherein the flexible circuit board (60) is arranged on the cell connector arrangement (50) such that the base section (100) is offset and parallel to the intermediate section (95), wherein the arm section (105) is bent around the cell connector (55) in the forming section (135) from the base section (100) in such a way thatthat the spring element (155) is arranged between the attachment section (140) and the intermediate section (95) of the cell connector (55) and the intermediate section (95) is arranged between the base section (100) and the spring element (155). Electrical energy storage device (10) for a vehicle,- wherein the electrical energy storage device (10) comprises a battery busbar system (15) according to one of claims 1 to 8 and an energy storage cell arrangement (20) with at least one first energy storage cell (25) and a second energy storage cell (30) arranged offset from the first energy storage cell (25),- wherein the battery busbar system (15) is arranged on the energy storage cell arrangement (20),- wherein the cell connector (55) is electrically connected at a first connection section (85) to a terminal (35, 40) of the first energy storage cell (25) and at a second connection section (90) to a terminal (35, 40) of the second energy storage cell (30),- wherein the intermediate section (95) electrically and mechanically connects the first connection section (85) to the second connection section (90),- wherein the spring element (155) with the tension force (FS) presses the system section (140) against the first energy storage cell (25) and the temperature sensor (160) is thermally connected to the first energy storage cell (25). Method for manufacturing the electrical energy storage device (10) according to claim 10, wherein the battery busbar system (15) according to any one of claims 1 to 8 provides an energy storage cell arrangement (20) with the first energy storage cell (25) and the second energy storage cell (30) arranged offset from the first energy storage cell (25), wherein the battery busbar system (15) is arranged along a mounting axis (175) on the energy storage cell arrangement (20), wherein the cell connector (55) is electrically connected at the first connection section (85) to the terminal (35, 40) of the first energy storage cell (25) and at the second connection section (90) to the terminal (35, 40) of the second energy storage cell (30), wherein the spring element (155) is tensioned between the intermediate section (95) and the first energy storage cell (25) in such a way thatthat the spring element (155) with the tension force (FS) presses the system section (140) against the first energy storage cell (25) and the temperature sensor (160) is thermally connected to the first energy storage cell (25).

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