Cell contacting system and electrical energy storage

Abstract

The invention relates to a cell contacting system (15) and an electrical energy storage device (10), wherein the cell contacting system (15) comprises a flexible printed circuit board (45), at least one cell connector arrangement (35) with at least one cell connector (50), a hold-down device (160), and at least one sensor (100), wherein the flexible printed circuit board (45) comprises an arm section (110), wherein the sensor (100) is arranged on the arm section (110), wherein the hold-down device (160) comprises a connection section (165), a spring section (170), and a support section (175), wherein the connection section (165) is mechanically connected to the cell connector (50), wherein the spring section (170) is arranged on the connection section (165), wherein the spring section (170) extends away from the connection section (165) and a first section arranged at a distance from the connection section (165). The facility has a floor area of ​​200.which is in contact with the arm section (110) and / or the sensor (100), wherein the spring section (170) provides a contact force (FS) that acts from the spring section (170) in the direction of the arm section (110), wherein the support section (175) extends away from the connecting section (165) and has a second contact surface (205) arranged at a distance from the connecting section (165), wherein the support section (175) is configured to provide a second counterforce (FG2) for at least partial support of the contact force (FS).

Description

[0001] The invention relates to a cell contacting system according to claim 1 and an electrical energy storage device for an electric vehicle according to claim 10.

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

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

[0004] The object of the invention is to provide an improved cell contacting system and an improved energy storage system.

[0005] This problem is solved by means of a cell contacting system according to claim 1 and an electrical energy storage device according to claim 10. Advantageous embodiments are specified in the dependent claims.

[0006] It was recognized that an improved cell contacting system for a vehicle's electrical energy storage device can be provided by a cell contacting system comprising a flexible printed circuit board, at least one cell connector assembly with at least one cell connector, a hold-down device, and at least one sensor. The flexible printed circuit board has a base section and an arm section that is connected to and extends away from the base section. The sensor is located on the arm section. The hold-down device has a connection section, a spring section, and a support section, wherein the connection section is mechanically connected to the cell connector. The spring section is located on the connection section, and the support section is attached to the connection section opposite the spring section.The spring section extends away from the connecting section and has a first contact surface arranged at a distance from the connecting section. The first contact surface rests against the arm section and / or the sensor. The spring section is designed to provide a clamping force acting from the spring section towards the arm section. The support section extends away from the connecting section and has a second contact surface arranged at a distance from the connecting section. The support section is designed to provide a second counterforce to at least partially support the clamping force.

[0007] This design has the advantage of preventing unwanted torsion of the connection section due to the contact force and unwanted line-borne stress on the mechanical connection between the cell connector and the connection section. This ensures that mechanical damage to the cell contacting system is avoided, making the system particularly vibration-resistant and giving it a long service life.

[0008] In a further embodiment, the spring section and / or the support section is designed in a band-like form, with the spring section having an S-shaped or Z-shaped profile. This design has the advantage that the hold-down device can be manufactured from a particularly cost-effective sheet metal material, especially nickel-coated sheet metal. The S-shaped or Z-shaped profile also has the advantage that the spring section can compress and retract particularly well, thus exhibiting high flexibility.

[0009] In another embodiment, the spring section between the first contact surface and the connection section has a first stiffness. The support section has a second stiffness that is greater than the first stiffness of the spring section.

[0010] In a further embodiment, the spring section has a recess on the first contact surface, in which the sensor is arranged. The recess is preferably designed as a through-opening in the spring section. This design has the advantage that the spring section does not rest directly on the sensor.

[0011] It is particularly advantageous if the recess is open on one side. Preferably, the recess is open on the side facing away from, for example, the connection section. This design has the advantage that at least one conductor track of the flexible printed circuit board can be routed in the area of ​​the open recess without the conductor track being contacted by the spring section.

[0012] In a further embodiment, the spring section is ribbon-shaped and has at least one first coil and one second coil, wherein the spring section is bent substantially between 160° and 200° inclusive at the first coil and / or the second coil. This ensures the S-shaped configuration. Furthermore, it ensures that the spring section lies flat against the arm section at the first contact surface, thus preventing unwanted edge loading of the arm section.

[0013] In a further embodiment, the spring section comprises at least a first sub-section and at least a second sub-section, wherein the first coil adjoins the connecting section. The first sub-section connects the first coil to the second coil. The first sub-section and the second sub-section are essentially plate-shaped, preferably arranged parallel to each other. The second sub-section adjoins the second coil on a side facing away from the first sub-section. The first contact surface can be arranged on the second sub-section. This design has the advantage that the spring section can be manufactured particularly easily and cost-effectively using a stamping and bending process. Furthermore, it eliminates the need for complex winding processes for manufacturing the spring section, such as winding a coil spring.

[0014] In a further embodiment, the connection section is plate-shaped and has a first upper surface and a lower surface, with the lower surface facing the arm section and the first upper surface facing away from the arm section. The connection section is connected to the cell connector at its lower surface. This design has the advantage that, for example, a tool, such as a sonotrode, can be placed on the first upper surface for mechanical connection, or that electromagnetic radiation, such as laser radiation, can be introduced into the connection section via the first upper surface for mechanical connection of the connection section to the cell connector.

[0015] In a further embodiment, the cell connector has a plate-shaped projection, wherein the connecting section is materially bonded to the projection, in particular welded, especially laser welded. The projection can extend into a gap between the flexible circuit board and the cell connector.

[0016] An improved electrical energy storage system for an electric vehicle, particularly a hybrid or fully electric vehicle, can be provided by the electrical energy storage system comprising a cell contacting system configured as described above and a storage cell arrangement with at least two energy storage cells. The cell connector electrically connects the energy storage cells to one another. The energy storage cell has a battery side surface facing the cell contacting system. The contact force presses the arm section against the battery side surface, and the sensor is thermally connected to the battery side surface. The support section rests against the battery side surface with its second contact surface.

[0017] This design has the advantage that the mechanical connection between the cell connector and the connection section is subjected primarily to tensile stress, but not shear stress, thus preventing the connection from unintentionally tearing. Furthermore, it ensures reliable contact between the arm section and the battery side surface, resulting in a particularly low thermal resistance between the sensor and the battery side surface.

[0018] The invention is explained in more detail below with the aid of figures. These show: Fig. 1 a schematic representation of an electrical energy storage device with a cell contacting system; Fig. 2 one in Fig. 1 marked section A of a constructive design of the cell contacting system; Fig. 3 a perspective view of a Fig. 2 shown hold-down device of the in Fig. 2 cell contacting systems shown in a relieved and / or disassembled state; Fig. 4 a side view of the in the Fig. 2 and Fig. 3 hold-down devices shown in a disassembled / relieved state; Fig. 5 a perspective representation of the in Fig. 2 to 4 of the shown hold-down devices; Fig. 6 a sectional view along a Fig. 2 section plane CC shown through the in Fig. 2 cell contacting systems shown; Fig. 7 den in Fig. Section A shown in Figure 1 during a fourth manufacturing step; Fig. 8 a section of a sectional view of the cell contacting system during assembly on the energy storage cell assembly; and Fig. 9 the in Fig. 8. Sectional view shown in the fully assembled state of the cell contacting system on the storage cell arrangement for the formation of the electrical energy storage system.

[0019] 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.

[0020] Fig. Figure 1 shows a schematic representation of an electrical energy storage device 10 with a cell contacting system 15.

[0021] The electrical energy storage device 10 can, for example, be configured as a traction battery for an electrically powered vehicle, in particular a fully electric vehicle or a hybrid vehicle. The one in Fig. The electrical energy storage device 10 shown can also be just one module or block of a larger electrical energy storage device 10 or the traction battery.

[0022] In Fig. Figure 1 schematically depicts the electrical energy storage device 10. The constructive design, in particular the cell contacting system 15, is discussed in the following figures.

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

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

[0025] In this embodiment, the cell contacting system 15 comprises, by way of example, at least one cell connector arrangement 35, a contact device 40, preferably at least one flexible printed circuit board 45, at least one first battery terminal 75 and one second battery terminal 80. Additionally, the cell contacting system 15 can have a carrier 55, which is arranged, for example, above the battery side surface 30.

[0026] The cell connector arrangement 35 comprises at least one cell connector 50, preferably several cell connectors 50, which can, for example, be arranged in a cell connector row 60. The cell connector row 60 can, for example, be aligned parallel to the x-axis.

[0027] The respective cell connector 50, for example, electrically connects a first terminal of the energy storage cell 25 to a second terminal (in Fig. (1 not shown) a further energy storage cell 25 of the storage cell arrangement 20, for example, arranged closest to the energy storage cell 25. The cell connector 50 can be electrically conductive. The cell connectors 50 can be electrically connected to each other, for example, only via the energy storage cell 25. Of course, it is also conceivable that the cell connector 50 electrically connects several terminals of several energy storage cells 25. The energy storage cells 25 can be electrically connected to each other in parallel and / or series and / or parallel-series by means of the cell connector 50.

[0028] Mechanically, the cell connector 50 can be connected to the respective terminal pole of the associated energy storage cell 25, for example, by means of a material-bonded connection, in particular a welded connection, most advantageously by means of an ultrasonic welded connection or a laser welded connection.

[0029] The cell connector arrangement 35 can be electrically connected to at least one battery terminal 75, 80. The electrical energy storage device 10 can be electrically connected to a high-voltage system of the vehicle via the battery terminal 75, 80. The electrical energy stored in the energy storage cell 25 can be supplied via the battery terminal 75, 80, or the energy storage cell 25 of the storage cell arrangement 20 can be charged with electrical energy.

[0030] The flexible printed circuit board 45 is arranged transversely, for example, at a distance from the cell connector arrangement 35. The flexible printed circuit board 45 can be single-layer or multi-layered. The flexible printed circuit board 45 is also referred to as a Flexible Printed Circuit (FPC).

[0031] The flexible printed circuit board 45 has a flexible carrier layer 85 on and / or at which at least one conductor arrangement 90 with at least one conductor 95 is arranged. For the sake of clarity, in Fig. 1. The representation of the conductor track arrangement 90 has been omitted.

[0032] At least one conductor track 95 of the conductor track arrangement 90 can, for example, be electrically connected directly or indirectly to one of the cell connectors 50. Furthermore, the conductor track arrangement 90 extends towards the contact device 40 and electrically connects the cell connector 50 to the contact device 40.

[0033] Due to the flexible carrier layer 85 of the flexible printed circuit board 45, the flexible printed circuit board 45 can be bent reversibly and non-destructively with minimal force by an angle of at least 30° up to and including 300°. In particular, the flexible printed circuit board 45 is especially well suited for being laid parallel to the battery side surface 30 or laid within the carrier 55 and / or conforming to the battery side surface 30.

[0034] In this embodiment, the cell contacting system 15 additionally comprises at least one sensor 100. The sensor 100 can, for example, be a temperature sensor, which is electrically connected to one of the conductor tracks 95 of the conductor track arrangement 90. The sensor 100 can be thermally connected to at least one of the energy storage cells 25 on the battery side surface 30.

[0035] The sensor 100 can be electrically connected to the contact device 40 via at least one conductor track 95 of the conductor track arrangement 90. The conductor track arrangement 90 extends, for example, from the base section 105 across the first connection area 145 to the first contact area 125, for example on a side facing away from the battery side surface 30.

[0036] During operation of the electrical energy storage device 10, for example during charging or discharging via the battery terminals 75, 80, the cell voltage and temperature of the energy storage cell 25, for example, change. In particular, the energy storage cell 25 can heat up considerably during a fast charging process. To optimally charge the energy storage cell 25 and / or prevent it from being charged with excessive electrical power, a battery management system (not shown) monitors both the cell voltage and the cell temperature of the energy storage cell 25 and controls the fast charging and / or discharging process in such a way as to prevent damage and / or destruction of the energy storage cell 25. The battery management system can be connected to the contact device 40 for this purpose.

[0037] During charging or discharging, the geometric extent of the energy storage cell 25 changes depending on the temperature. Of particular relevance here is the temperature-dependent change in the thickness of the energy storage cell 25 in the longitudinal direction (x-direction).

[0038] Fig. 2 shows one in Fig. 1 marked section A of a constructive design of the cell contacting system 15.

[0039] In Fig. In Figure 2, the battery side surface 30 and the storage cell arrangement 20 are arranged on a side facing away from the viewer. For the sake of clarity, the representation of the storage cell arrangement 20 with the energy storage cells 25 is omitted. Fig. 2 waived.

[0040] The flexible printed circuit board 45 has a base section 105 and an arm section 110. The base section 105 can be ribbon-like and, for example, extend substantially along the x-axis in the longitudinal direction. The arm section 110 is attached to the base section 105. In particular, the arm section 110 and the base section 105 are, for example, formed in one piece and made of a single material.

[0041] In Fig. Figure 2 shows only one arm section 110 and only one base section 105. Of course, the flexible printed circuit board 45 can have several base sections 105 and / or several arm sections 110, for example, several arm sections 110 being arranged on one base section 105.

[0042] The arm section 110 has a fixed end 115, at which the arm section 110 is arranged on the base section 105. The arm section 110 extends, for example, essentially in a straight line to a free end 120, which is arranged longitudinally offset from the fixed end 115.

[0043] The arm section 110 of the flexible printed circuit board 45 has a first contact area 125, which is essentially plate-shaped. The first contact area 125 adjoins the free end 120 in the longitudinal direction. The first contact area 125 is arranged in the z-direction towards the battery side surface 30 and, in the assembled state, rests against the battery side surface 30 with a first arm section side surface 130, for example.

[0044] The sensor 100 is arranged in the z-direction on a second arm section side surface 135 facing away from the first arm section side surface 130. The sensor 100 can be encapsulated in a capsule 140 and arranged on the second arm section side surface 135.

[0045] The first attachment area 125 is connected to the fixed end 115 via a first connecting area 145 of the arm section 110, which is, for example, inclined at an angle to the first attachment area 125.

[0046] The design of the first connection area 145 and the first attachment area 125 can, for example, be such that the base section 105, the first attachment area 125, and the first connection area 145 extend essentially along the longitudinal direction. The arm section 110 can be arranged parallel to the cell connector arrangement 35, spaced apart from the cell connector arrangement 35 by a gap 150.

[0047] By designing the circuit board 45 as a flexible circuit board 45, the first plant area 125 can be moved in the z-direction (in Fig. 2 (schematically indicated by a double arrow) be reversibly movable, with height compensation being achieved by pivoting the first connection area 145 relative to the first contact area 125 and the base section 105. In the assembled state, the first contact area 125, with its first arm section side surface 130, preferably rests flatly, and in particular over its entire surface, against the battery side surface 30, ensuring good thermal contact between the sensor 100 and the battery side surface 30 via the first contact area 125. The base section 105 can be aligned parallel to the first contact area 125.

[0048] Furthermore, the cell contacting system 15 includes a hold-down device 160. The hold-down device 160 is arranged on the arm section 110 and provides a contact force FS with which the hold-down device 160 acts on the second arm section side surface 135. With the contact force FS, the first contact area 125 with the first arm section side surface 130 is pressed against the battery side surface 30, so that even in the event of temperature-related expansion or contraction of the energy storage cell 25, a secure contact between the first arm section side surface 130 and the battery side surface 30 is ensured, and thus good thermal contact / connection between the sensor 100 and the battery side surface 30, and thus between the associated energy storage cell 25, is ensured.

[0049] Furthermore, the hold-down device 160 can be electrically conductive. The hold-down device 160 can also be electrically connected to the conductor track arrangement 90.

[0050] The constructive design of the hold-down device 160 is discussed in the following figures.

[0051] Fig. Figure 3 shows a perspective view of a [structure / project] in [location] Fig. 2 shown hold-down 160 of the in Fig. 2 cell contacting system 15 shown in relieved and / or disassembled state.

[0052] The hold-down device 160 comprises a connecting section 165, a spring section 170, and a support section 175. In this embodiment, the hold-down device 160, together with the connecting section 165, the spring section 170, and the support section 175, is manufactured in one piece from a single material, preferably a thin-walled sheet metal material. In particular, the hold-down device 160 can be made of a steel material, especially spring steel, or of nickel, especially nickel strip and / or nickel-plated steel strip. The hold-down device 160 can be manufactured, for example, from a strip material using a stamping and bending process.

[0053] The connection section 165 is essentially plate-shaped and extends, for example, in an xy-plane. The connection section 165 has a first side 180 and a second side 185 arranged opposite the first side 180 in the x-direction.

[0054] The spring section 170, for example, connects to the first side 180 in the x-direction. Opposite the first side 180, the support section 175 connects to the second side 185 in the x-direction.

[0055] The connection section 165 further comprises, for example, a first upper surface 190 and a lower surface 195 arranged opposite the first upper surface 190 in the z-direction. The lower surface 195 faces both the spring section 170 and the support section 175. The first upper surface 190 faces away from both the spring section 170 and the support section 175. The connection section 165 can be attached to the cell connector 50 (in) at the lower surface 195 or at the first upper surface 190. Fig. 3 (not shown) must be attached.

[0056] Both the spring section 170 and the support section 175 extend away from the connecting section 165. The spring section 170 has, for example, a first contact surface 200. The first contact surface 200 can be planar. The first contact surface 200 is preferably offset in the z-direction relative to the underside 195 and is located on a side of the spring section 170 facing away from the connecting section 165. The first contact surface 200 is adjacent to the battery side surface 30 (not in Fig. (3 shown) facing the first mounting surface 200. In the longitudinal direction, the first mounting surface 200 can have at least partial overlap in the x-direction with the connecting section 165. An overlap in the x-direction is understood to mean that when two components are projected in the z-direction onto a projection plane, for example an xy-plane, the two components, for example the first mounting surface 200 and the connecting section 165, overlap and / or superimpose on each other in the projection plane.

[0057] In this embodiment, for example, the spring section 170 can have a substantially S-shaped basic form. Of course, it is also possible for the spring section 170 to have a different design, for example a Z-shaped, a U-shaped, or a stepped configuration.

[0058] The support section 175, together with the connection section 165, has a Z-shaped configuration. On a side facing away from the connection section 165, the support section 175 has a second contact surface 205, wherein the first contact surface 200 and the second contact surface 205 are, for example, aligned parallel to each other. In this embodiment, the first contact surface 200 can be offset from the second contact surface 205 in the z-direction. In particular, the first contact surface 200 can be arranged between the underside 195 and the second contact surface 205 (referring only to the z-direction).

[0059] In this embodiment, for example, the second contact surface 205 does not overlap the connection section 165 in the x-direction. Of course, it would also be possible for the support section 175 to be designed such that, for example, the second contact surface 205 overlaps the connection section 165 in the x-direction. This would be possible, for example, if the connection section 165 and the support section 175 are U-shaped relative to each other.

[0060] The spring section 170 preferably has a first stiffness. The support section 175 has a second stiffness. In the embodiment, for example, the spring section 170 is designed such that the first stiffness is less than the second stiffness of the support section 175.

[0061] Fig. 4 shows a side view of the [unclear] in the Fig. 2 and Fig. 3 shown hold-down devices 160 in a disassembled / relieved state.

[0062] The spring section 170 preferably has a first coil 210, a first sub-section 215, a second coil 220 and a second sub-section 225.

[0063] The first coil 210 preferably adjoins the first side 180 directly. In the first coil 210, the spring section 170 is bent substantially between 160° and 200°, preferably substantially by 180°. The bending of the strip-shaped material of the spring section 170 occurs about a first bending axis 230, which runs parallel to the y-axis.

[0064] On a side facing away from the first side 180, the first subsection 215 adjoins the first coil 210. In the first subsection 215, the spring section 170, particularly in the unloaded / disassembled state, can be aligned parallel to the connecting section 165 and / or to the first contact surface 200. In the x-direction, the first subsection 215 preferably has complete overlap with the connecting section 165.

[0065] On the side opposite the first coil 210, the second coil 220 adjoins the first section 215. In the region of the second coil 220, the strip-shaped material of the spring section 170 is preferably bent substantially by 160° to 200° inclusive, and preferably substantially by 180°, about a second bending axis 235. The second bending axis 235 is preferably aligned parallel to the first bending axis 230, so that in this embodiment, the second bending axis 235 is also aligned, for example, parallel to the y-axis.

[0066] The second section 225 adjoins the second turn 220 on a side facing away from the first section 215. Like the first section 215, the second section 225 is plate-shaped and, for example, extends in an xy-plane. The first contact surface 200 is located on the second section 225 on a side facing away from the first section 215. The second section 225 preferably has partial overlap in the x-direction with the connecting section 165 and, for example, complete overlap in the x-direction with the first section 215. In the x-direction, the second section projects beyond the first side 180.

[0067] Preferably, the first sub-section 215 and the second sub-section 225 can be arranged parallel to each other. In the z-direction, the first sub-section 215 is arranged between the second sub-section 225 and the connecting section 165.

[0068] As explained above, the support section 175 is arranged opposite the spring section 170 in the longitudinal direction (x-direction). The support section 175 has a second contact area 240 and a second connection area 245, wherein the second contact area 240 and the second connection area 245 are each plate-shaped. The second connection area 245 adjoins the connecting section 165 on the second side 185 and forms a first angle α with the connecting section 165. Preferably, the first angle α is formed as an obtuse angle or as a right angle. Fig. 4 for example the second connection area 245 is arranged at an angle to the connection section 165.

[0069] The second system area 240 is offset in the z-direction relative to the connection section 165 and can be aligned parallel to the connection section 165. The second system surface 205 is located on the side facing away from the connection section 165. The second system area 240 is connected to the connection section 165 by means of the second connection area 245.

[0070] Fig. 5 shows a perspective view of the area in the Fig. 2 to 4 shown hold-downs 160.

[0071] In this embodiment, for example, a recess 250 is arranged in the second subsection 225 of the spring section 170. The recess 250 is designed, for example, as a through-opening and extends completely through the second subsection 225 in the z-direction. The recess 250 opens onto the first contact surface 200.

[0072] In this embodiment, for example, the recess 250 can be open towards an outer circumferential contour of the spring section 170, in particular the second sub-section 225. In particular, it is possible that the recess 250 is open on a longitudinal side facing away from the connecting section 165, in particular the first side 180 of the connecting section 165.

[0073] The spring section 170, the support section 175, and the connecting section 165 each have a transverse end face 252 that extends substantially in an xz-plane. The hold-down device 160 also has a transverse projection 251 on its end face, which is located on the end face 252 of the connecting section 165. The projection 251 is connected, for example, to the strip material of the connecting section 165 and the hold-down device 160. The projection 251 can be, as shown in Fig. 5 can be identified, for example, by having essentially a rectangular outer contour and being formed from the strip material in a plate-like form. The first upper surface 190 and the lower surface 195 extend flat over the bulge 251 and the remaining connection section 165. The bulge 251 can also be omitted.

[0074] Fig. Figure 6 shows a sectional view along a [unclear] in Fig. 2 section plane CC shown through the in Fig. 2 cell contacting systems shown 15.

[0075] Additionally, in Fig. 6 schematically indicates the battery side surface 30 of the storage cell arrangement 20.

[0076] The cell connector 50 has a projection 255 on one side facing the flexible circuit board 45. This projection is, for example, beam-shaped and extends along an axis 260 that is parallel to the y-axis. The projection 255 extends, for example, into the gap 150 between the flexible circuit board 45 and the other cell connectors 50. The projection 255 has a second top surface 265 on the side facing away from the battery side surface 30. This top surface is, for example, planar.

[0077] The cell connector 50 and the base section 105 essentially lie in a common xy-plane. The hold-down device 160 is preferably metallurgically bonded to the projection 255. In this embodiment, for example, the underside 195 of the connection section 165 rests against the second upper surface 265 of the projection 255. In particular, the hold-down device 160 can be welded to the underside 195 and the second upper surface 265, especially by ultrasonic or laser welding. Welding energy to weld the connection section 165 with its underside 195 to the second upper surface 265 can be introduced, for example, via the first upper surface 190 into the connection section 165 and the projection 255. For example, a sonotrode can be placed on the first upper surface 190, or the laser radiation can be introduced into the connection section 165 via the first upper surface 190.

[0078] The bulge 251 has the advantage that the surface area of ​​the first upper surface 190 and the lower surface 195 is increased, thus ensuring a good fit and a material-bonded connection between the connecting section 165 and the projection 255. Furthermore, the connecting section 165 is electrically connected to the projection 255 via this connection.

[0079] In this embodiment, for example, the sensor 100 engages in the recess 250. The encapsulation 140 encloses the sensor 100 at the first contact area 125 in such a way that a part of the second sub-area 225 of the spring section 170 of the retainer 160 is also enclosed in the encapsulation 140, ensuring a good material-bonded connection between the second sub-area 225, the sensor 100 and the first contact area 125.

[0080] The conductor track arrangement 90 with the conductor tracks 95 for connecting the sensor 100 can be routed through the outwardly open recess 250 to the sensor 100, thus preventing the second sub-area 225 from resting on the first contact surface 200 on the conductor track arrangement 90. In particular, this prevents mechanical damage and / or an electrical short circuit caused by the electrically conductive material of the hold-down device 160.

[0081] Furthermore, the hold-down device 160 can be electrically connected to one of the conductor tracks 95 of the conductor track arrangement 90, for example, laterally to the recess 250 on the first mounting surface 200. This connection can be made, for example, by means of a soldered connection. The hold-down device 160 thus electrically connects the conductor track 95 to the cell connector 50, so that additional information about the voltage of the energy storage cell 25 connected to the cell connector 50 can be provided via the hold-down device 160.

[0082] In the assembled state of the electrical energy storage device 10, the hold-down device 160 is clamped and provides the clamping force FS by means of the spring section 170. The clamping force FS presses the spring section 170 against the first arm section side surface 130 at the first contact surface 200. The clamping force FS presses the second arm section side surface 135 against the battery side surface 30, thus ensuring good thermal contact between the sensor 100 and the battery side surface 30. This allows the sensor 100 to quickly detect temperature changes in the battery side surface 30. The spring section 170 is supported against the connection section 165 by a first counterforce FG1. The first counterforce FG1 essentially corresponds to the clamping force FS.

[0083] Additionally, the support section 175 provides a second counterforce FG2 to the connection section 165, which can be in the same direction as the first counterforce FG1. The axis 260, arranged between the first counterforce FG1 and the second counterforce FG2, at least partially, and preferably completely, reduces the torque about the axis 260 generated by the first counterforce FG1. This reduces or eliminates shear stress on the bonded connection between the hold-down device 160 and the projection 255, thus ensuring a long-term, reliable connection between the hold-down device 160 and the cell connector 50.

[0084] By arranging the connecting section 165 longitudinally between the spring section 170 and the support section 175, sufficient space is provided to establish a reliable, metallurgical bond between the projection 255 and the connecting section 165. Furthermore, sufficient space is provided to position the tool for creating the metallurgical bond on the connecting section 165 or, for example, to direct electromagnetic radiation onto the connecting section 165.

[0085] The recess 250 eliminates the need for an additional wire bridge to connect the sensor 100. Furthermore, the recess 250 can be easily produced during the manufacturing of the hold-down device 160, for example, during a stamping process.

[0086] Fig. 7 shows the one in Fig. Section A shown in Figure 1 during a fourth manufacturing step. Fig. Figure 8 shows a section of a sectional view of the cell contacting system 15 during assembly on the energy storage cell arrangement 20. Fig. 9 shows the in Fig. 8 shown sectional view in the fully assembled state of the cell contacting system 15 on the storage cell arrangement 20 for the formation of the electrical energy storage device 10.

[0087] To manufacture the cell contacting system 15, in a first manufacturing step the flexible printed circuit board 45 is produced and equipped with the sensor 100.

[0088] In a second manufacturing step, for example, the hold-down device 160 can be cut and bent from a thin-walled sheet material, such as steel and / or nickel, using a stamping and bending process. In particular, the spring section 170 can also be formed into an S- or Z-shape.

[0089] In a third manufacturing step, the hold-down device 160 is positioned on the arm section 110 such that the sensor 100 is arranged in the recess 250 and the conductor tracks 95 of the sensor 100 run in the recess 250.

[0090] In the fourth manufacturing step (see Fig. 7) The arm section 110 and the base section 105 of the flexible printed circuit board 45 are positioned on a support surface 270, for example, of a mounting device. The support surface 270 can be planar and extend in an xy-plane. The second contact surface 205 of the support section 175 and the arm section 110 rest flat on the support surface 270.

[0091] In a fifth manufacturing step, the hold-down device 160 is electrically connected, for example by soldering, to one of the conductor tracks 95 of the conductor track arrangement 90 at the first contact surface 200. The rear support of the hold-down device 160 by means of the support section 175 prevents the hold-down device 160 from tilting on the arm section 110, thus reliably preventing tilting of the hold-down device 160 during soldering or connecting, for example, at the first contact surface 200 and the conductor track 95. Furthermore, a predefined layer thickness of a solder joint thus produced between the first contact surface and the conductor track 95 can be ensured.

[0092] In a sixth manufacturing step, the cell connector 50 is positioned at the connection section 165 and inserted, for example, into a space 275 between the system section 170 and the connection section 165.

[0093] In a seventh manufacturing step, the connecting section 165 is joined to the projection 255 by a material bond, for example by welding. For this purpose, for example a sonotrode can be placed on the first top surface 190 or electromagnetic radiation, in particular laser radiation, can be introduced via the first top surface 190 into the hold-down device 160, in particular the connecting section 165 and the projection 255.

[0094] In the assembly of the electrical energy storage device 10, the cell contacting system 15 is placed onto the storage cell arrangement 20, for example by a movement along the z-axis (in Fig. 8 represented by an arrow).

[0095] In an unloaded / unloaded state of the cell contacting system 15, as already described above (see above). Fig. 8), in particular the turns 210, 220 form, for example, a 180° arc.

[0096] In an eighth manufacturing step, the cell contacting system 15 is placed onto the battery side surface 30. During this process, the spring section 170 is deformed so that it springs in the z-direction. This tensioning of the spring section 170 provides the contact force FS (see figure). Fig. 9) The spring section 170 can deform, so that at least the first subsection 215 and at least part of the connecting section 165 are shaped at an angle to each other. The clamping force FS is selected such that secure, full-surface contact of the first contact surface 200 with the first contact area 125 of the arm section 110 is ensured. This also ensures good thermal contact between the arm section 110 and the battery side surface 30.

[0097] The above-described design also has the advantage that continuous pressure of the arm section 110 against the battery side surface 30 is ensured even during thermal expansion or contraction of the associated energy storage cell 25. Furthermore, the above-described design of the retainer 160 is vibration-resistant, and the retainer 160 prevents the arm section 110 from unintentionally lifting off the battery side surface 30, even under strong vibrations.

[0098] Furthermore, the contact force FS is specified by the spring section 170 and its geometric design, reliably preventing over-pressing of the arm section 110 against the battery side surface 30. It is also ensured that the contact force FS is sufficiently high to press the arm section 110 against the battery side surface 30. Reference symbol list 10 electrical energy storage devices 15 cell contacting system 20 memory cell arrangement 25 Energy storage cells 30 Battery side surface 35 cell connector arrangement 40 Contact device 45 flexible printed circuit boards 50 cell connectors 55 carriers 60 cell connector series 75 Battery connection 80 Battery connection 85 flexible carrier layer 90 conductor track arrangement 95 conductor track 100 Sensor 105 Basic section 110 arm section 115 fixed end 120 free end 125 first attachment area (of the arm section) 130 first arm section side surface 135 second arm section side surface 140 encapsulations 145 first connection area (of the arm section) 150 gap 160 hold-down devices 165 Connection section 170 spring section 175 Support section 180 first page (of the connecting section) 185 second page (of the connecting section) 190 first top side (of the connection section) 195 bottom 200 first contact surface (of the spring section) 205 second support surface (of the support section) 210 first turn 215 first sub-area 220 second turn 225 second sub-area 230 first bending axis 235 second bending axis 240 second installation area (of the support section) 245 second connection area (of the support section) 250 Recess (of the spring section) 251 Bulge (of the connecting section) 252 Front 255 lead (of the cell connector) 260 axle 265 second upper surface (of the protrusion) 270 mm contact area 275 Room FS contact force FG1 first opposing force FG2 second counterforce α first angle

Claims

[1] Cell contacting system (15) for an electrical energy storage device (10) of a vehicle, - wherein the cell contacting system (15) comprises a flexible printed circuit board (45), at least one cell connector arrangement (35) with at least one cell connector (50), a hold-down device (160) and at least one sensor (100), - wherein the flexible printed circuit board (45) has a base section (105) and an arm section (110) which is connected to the base section (105) and extends away from the base section (105), - wherein the sensor (100) is arranged on the arm section (110), - wherein the hold-down (160) has a connecting section (165), a spring section (170) and a support section (175), - wherein the connecting section (165) is mechanically connected to the cell connector (50), - wherein the spring section (170) is arranged on the connecting section (165) and the support section (175) is attached to the connecting section (165) opposite the spring section (170), - wherein the spring section (170) extends away from the connecting section (165) and has a first contact surface (200) arranged at a distance from the connecting section (165), which rests against the arm section (110) and / or the sensor (100), - wherein the spring section (170) is configured to provide a contact force (FS) acting from the spring section (170) in the direction of the arm section (110), - wherein the support section (175) extends away from the connection section (165) and has a second support surface (205) arranged at a distance from the connection section (165), - wherein the support section (175) is designed to provide a second counterforce (FG2) to at least partially support the clamping force (FS). [2] Cell contacting system (15) according to claim 1, - wherein the spring section (170) and / or the support section (175) is designed in a band-like form, - wherein the spring section (170) has an S-shaped or Z-shaped profile. [3] Cell contacting system (15) according to any one of the preceding claims, - wherein the spring section (170) between the first contact surface (200) and the connection section (165) has a first stiffness, - wherein the support section (175) has a second stiffness that is greater than the first stiffness of the spring section (170). [4] Cell contacting system (15) according to any one of the preceding claims, - wherein the spring section (170) has a recess (250) at the first contact surface (200), - wherein the sensor (100) is arranged in the recess (250), - wherein the recess (250) is preferably designed as a through-opening. [5] Cell contacting system (15) according to claim 4, - wherein the recess (250) is open on one side. [6] Cell contacting system (15) according to any one of the preceding claims, - wherein the spring section (170) is band-shaped, - wherein the spring section (170) has at least one first coil (210) and one second coil (220), - wherein at the first coil (210) and / or the second coil (220) the spring section (170) is substantially bent between 160° inclusive and 200° inclusive. [7] Cell contacting system (15) according to claim 6, - wherein the spring section (170) has at least a first sub-section (215) and at least a second sub-section (225), - wherein the first turn (210) connects to the connecting section (165), - wherein the first sub-section (215) connects the first turn (210) with the second turn (220), - wherein the first sub-area (215) and the second sub-area (225) are essentially plate-shaped, - wherein preferably the first sub-area (215) and the second sub-area (225) are arranged parallel to each other. [8] Cell contacting system (15) according to any one of the preceding claims, - wherein the connection section (165) is plate-shaped, - wherein the connection section (165) has a first top side (190) and a bottom side (195), - wherein the underside (195) faces the arm section (110) and the first upper side (190) faces away from the arm section (110), - wherein the connection section (165) is connected to the cell connector (50) on the underside (195). [9] Cell contacting system (15) according to any one of the preceding claims, - wherein the cell connector (50) has a plate-shaped projection (255), - wherein the connecting section (165) is materially bonded to the projection (255), in particular welded, in particular laser welded. [10] Electrical energy storage device (10) for an electric vehicle, in particular a hybrid vehicle or a fully electric vehicle, - wherein the electrical energy storage device (10) comprises a cell contacting system (15) according to one of the preceding claims and a storage cell arrangement (20) with at least two energy storage cells (25), - wherein the cell connector (50) electrically connects the energy storage cells (25) to each other, - wherein the energy storage cell (25) has a battery side surface (30) facing the cell contacting system (15), - wherein the contact force (FS) presses the arm section (110) against the battery side surface (30) and the sensor (100) is thermally connected to the battery side surface (30), - wherein the support section (175) rests against the second contact surface (205) on the battery side surface (30).

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