Contact system, electrical energy storage device and method for manufacturing the electrical energy storage device

Abstract

The invention relates to a contacting system (15), an electrical energy storage device (10), and a method for manufacturing the electrical energy storage device (10), wherein the contacting system (15) comprises at least one flexible printed circuit board (35), a connecting pad (75), and a temperature sensor (50), wherein the flexible printed circuit board (35) has a through-pass area (110) in a plate section (65), wherein the temperature sensor (50) is arranged on the plate section (65), wherein the connecting pad (75) has a first pad side surface (80) and a second pad side surface (85) which is arranged opposite the first pad side surface (80), wherein the connecting pad (75) abuts the plate section (65) at the first pad side surface (80), wherein the connecting pad (75) is arranged in a first partial area (155) on the through-pass area (110), and wherein the connecting pad (75) is metallurgically bonded at least in a second partial area (160) of the Connection pads (75),which is arranged offset from the first sub-section (155), is connected to the plate section (65), wherein the passage area (110) is designed to be transparent for a predefined electromagnetic radiation (150), so that the electromagnetic radiation (150) can be introduced into the first sub-section (155) of the connection pad (75) to activate the connection pad (75).

Description

The invention relates to a contacting system according to claim 1, an electrical energy store according to claim 9 and a method for producing the electrical energy store according to claim 10.US 2020 / 0295325 A1 discloses a battery module having electrochemical cells which are fastened in a housing.It is an object of the invention to provide an improved contacting system, an improved electrical energy store and an improved method for producing the electrical energy store.This object is achieved by means of a contacting system according to patent claim 1, an electrical energy store according to patent claim 9 and a method for producing the electrical energy store according to patent claim 10. Advantageous embodiments are given in the dependent claims.It has been recognized that an improved contacting system for an electrical energy store, in particular for a traction battery, of a vehicle can be provided in that the contacting system has at least one flexible printed circuit board, a connecting pad and a temperature sensor. The flexible printed circuit board has a passage region in a plate portion, wherein the temperature sensor is arranged on the plate portion. The connection pad includes a first pad side surface and a second pad side surface disposed opposite to the first pad side surface. At the first pad side surface, the connection pad abuts the plate portion.The connecting pad is arranged in a first partial region on the passage region, wherein the connecting pad is connected to the plate section in a materially bonded manner at least in a second partial region of the connecting pad, which is arranged offset with respect to the first partial region. The passage region is configured to be transmissive for predefined electromagnetic radiation, in particular for light radiation, such that the electromagnetic radiation can be introduced into the first subsection of the connection pad for activating the connection pad.This configuration has the advantage that the plate section can be connected to the energy storage cell in a particularly simple and cost-effective manner in a materially bonded manner via the connecting pad, so that a good thermal connection of the plate section and of the connecting section to the energy storage cell is possible.It is particularly advantageous if the connecting pad comprises at least one of the following materials: thermoplastic, wax, one or more polymeric materials, polypropylene, polyethylene, HDPE, LDPE, adhesive material, polyacrylate, polyacrylic, carboxymethylcellulose (CMC), thermosetting plastic, acrylate. One or more of these materials are always particularly suitable for being activated for polymerization by means of electromagnetic radiation.It is particularly advantageous if the connecting pad is designed to be thermally conductive. In particular, the connecting pad has a thermal conductivity of 2 W / (m·K) to 5 W / (m·K). This ensures good thermal connection of the temperature sensor to the energy storage cell. Furthermore, the connecting pad serves as a tolerance compensation, so that the thermal resistance between the temperature sensor and the energy storage cell is particularly low.In a further embodiment, the plate section has a first side surface and a second side surface arranged opposite the first side surface, wherein the passage region has a through-opening which extends at least in sections between the first side surface and the second side surface. The temperature sensor is arranged on the first side surface and the first pad side surface of the connection pad abuts on the second side surface. An optical resistance for the electromagnetic radiation, in particular light radiation, can be kept particularly low through the through-opening.In a further embodiment, the flexible printed circuit board has a substrate layer and at least one electrically conductive conductive conductive layer having at least one conductor track. The conductive layer is arranged laterally offset at the passage region. This makes it possible to prevent the conductive layer, which is difficult to pass through by its electrically conductive material for the electromagnetic radiation, in particular for the light radiation, from strongly attenuating the electromagnetic radiation on the path from the first side surface to the second side surface.The substrate layer is transmissive for the electromagnetic radiation in the passage region. In this case, in particular the substrate layer is transparent in the passage region. As a result, the plate portion can be connected to the memory cell side surface with a particularly large area via the connection pad.In a further embodiment, the through-opening in the passage region penetrates the substrate layer. As a result, a particularly large amount of energy can be introduced into the connection pad for activating the connection pad.In a further embodiment, the flexible printed circuit board further comprises a connecting portion and a main portion, wherein the connecting portion adjoins the board portion. The main portion and the plate portion extend in two planes arranged offset from one another. The connecting portion is arranged inclined to the plate portion. This configuration ensures that the plate portion is arranged movably with respect to the main portion and can therefore carry along movements, in particular resulting from thermal expansion or thermal contraction of the energy storage cell arrangement, without the flexible printed circuit board being damaged in the process.An improved electrical energy store, in particular a traction battery, for a vehicle can be provided in that the electrical energy store has an energy storage cell arrangement having at least one energy storage cell and a contacting system. The contacting system is configured as described above. The electrical energy storage cell has a storage cell side face on a side facing the contacting system. The connection pad is disposed between the memory cell side surface and the plate portion. The connecting pad is connected to the memory cell side surface in a materially integral manner on a second pad side surface. The connection pad thermally connects the electrical energy storage cell to the temperature sensor.This embodiment has the advantage that mechanical means for pressing the temperature sensor against the energy storage cell can be dispensed with. The cohesive connection of the plate section, on which the temperature sensor is arranged, to the energy storage cell furthermore ensures a short thermal path between the temperature sensor and the energy storage cell. Furthermore, an air gap between the flexible printed circuit board, in particular the plate section, and the energy storage cell can be avoided by the connecting pad, such that the thermal resistance is particularly low.An improved method for producing an electrical energy store can be provided in that the contacting system, which is designed as described above, and at least one energy storage cell arrangement having at least one energy storage cell are provided. The contacting system is arranged on the energy storage cell arrangement in such a way that the connecting pad abuts with the second pad side surface on a storage cell side surface of the energy storage cell. Electromagnetic radiation is provided which is directed at the passage region. The electromagnetic radiation penetrates the passage region at least partially and is introduced into the connecting pad. The electromagnetic radiation activates the connecting pad and the connecting pad forms a cohesive connection to the memory cell side surface on the second pad side surface.This method has the advantage that a rapid activation of the connection pad is possible by means of the electromagnetic radiation. Furthermore, the means for providing the electromagnetic radiation can be integrated into a production plant in a particularly cost-effective and simple manner.It is particularly advantageous if the electromagnetic radiation has a wavelength of 350 nm to 950 nm. Additionally or alternatively, in particular the electromagnetic radiation can be laser radiation. This configuration has the advantage that the electromagnetic radiation, in particular light, can be directed onto the passage region in a very targeted manner by means of the laser radiation.In a further embodiment, the electromagnetic radiation acts on at least one first precursor of a material of the connection pad in the first sub-region and activates the first precursor. The first precursor is activated in the second sub-region from the first sub-region. The first precursor is cured to form the material. The first precursor polymerizes, so that a good reliable cohesive connection and a tough material are formed.In a further embodiment, the connection pad thermally connects the temperature sensor to the memory cell side surface via the plate portion.The invention is explained in more detail below with reference to figures. The following are shown: FIG. 1 shows a perspective illustration of an electrical energy store according to a first embodiment; FIG. 2 shows a perspective illustration of a detail A marked in FIG. 1 of the electrical energy store shown in FIG. 1 ; FIG. 3 shows a sectional view along a sectional plane A-A, shown in FIG. 2, through the electrical energy store; and FIG. 4 shows a sectional view along a sectional plane A-A shown in FIG. 2 through an electrical energy store according to a second embodiment.In the following figures, reference is made to a coordinate system for ease of understanding. The coordinate system has an x-axis (longitudinal direction), a y-axis (transverse direction) and a z-axis (height direction). The coordinate system can be designed as a right-hand system.FIG. 1 shows a perspective illustration of an electrical energy store 10 according to a first embodiment.The electrical energy store 10 has a contacting system 15 and an energy store cell arrangement 20. The energy storage cell arrangement 20 preferably has a multiplicity of electrical energy storage cells 25. The energy storage cell 25 can be designed prismatically or as a round cell. The energy storage cell 25 can be designed, for example, as a lithium ion cell, lithium iron phosphate cell or as a supercap. Of course, another configuration of the energy storage cell 25 is also possible both in its chemical configuration and in its geometric configuration.In the embodiment, the electrical energy store 10 is designed, for example, as a traction battery for an electrically driven vehicle, in particular a fully electric vehicle or a hybrid vehicle. Of course, the electrical energy store 10 can also be designed as a supply battery.In the embodiment, each of the electrical energy storage cells 25 has, by way of example, a first connection pole and a second connection pole which is arranged offset with respect to the first connection pole on the respective energy storage cell 25. In FIG. 1, the connection poles of the energy storage cell 25 are concealed by the contacting system 15 shown in FIG. 1, which is arranged, for example, on the top side of the energy storage cell arrangement 20. The first connection pole and the second connection pole serve to connect the electrical energy storage cells 25 to one another in a power-electric manner.Furthermore, in FIG. 1, the energy storage cells 25 are arranged next to one another in a stack by way of example along the longitudinal axis (x axis). In FIG. 1, the contacting system 15 can be arranged above the stack of energy storage cells 25 of the energy storage cell arrangement 20, for example.The contacting system 15 comprises a carrier 30, a flexible printed circuit board 35, at least one contact device 40, a cell connector arrangement 45 and a temperature sensor 50.The flexible circuit board 35 is also referred to as a flexible printed circuit board (FPCB). The flexible printed circuit board 35 is designed to transmit signals and / or information about operating parameters, for example a voltage and / or a temperature.The cell connector assembly 45 may include one or more cell connectors. Each of the cell connectors of the cell connector arrangement 45 connects the first and second connection pole to one another in a power-electric manner. The respective energy storage cell 25 is charged or discharged via the cell connector arrangement 45. Here, currents of 10 amperes to 500 amperes can occur and can be transmitted to a battery terminal (not shown in FIG. 1 ) by means of the cell connector arrangement 45.In the embodiment, the flexible printed circuit board 35 is arranged, by way of example, above the cell connector arrangement 45. In the z-direction, the carrier 30 can be arranged between the cell connector arrangement 45 and the flexible printed circuit board 35. The carrier 30 is configured to at least partially support and / or support the flexible printed circuit board 35.Substantially parallel to the x-axis, the flexible printed circuit board 35 can have, for example, at least one main section 55. The main portion 55 may be connected to the contactor 40 at one side. By means of the contact device 40, the contacting system 15 can be connected, for example, to a battery management system. In the embodiment, for example, the contact device 40 is arranged laterally on the electrical energy store 10. The main section 55 is configured in the form of a strip or plate and extends substantially in a first plane, which is configured, for example, as an xy plane and is arranged at a distance from the energy storage cell arrangement 20.The flexible circuit board 35 additionally includes a connection portion 60 and a board portion 65 in addition to the main portion 55. In particular, it is possible for the flexible printed circuit board 35 to have a plurality of connecting portions 60 and a plurality of plate portions 65. However, for reasons of clarity, FIG. 1 shows only one of the plate sections 65 and one of the connecting sections 60. The connecting portion 60 is disposed between the board portion 65 and the main portion 55, and connects the board portion 65 of the flexible circuit board 35 to the main portion 55.The plate portion 65 is arranged offset in the transverse direction from the main portion 55, for example. The plate portion 65 is also arranged offset in the z direction toward the energy storage cell arrangement 20. In this case, the plate section 65 can extend in a second plane parallel to the first plane and thus parallel to the main section 55. The plate portion 65 has the temperature sensor 50 disposed thereon.FIG. 2 shows a perspective illustration of a detail A marked in FIG. 1 of the electrical energy store 10 shown in FIG. 1.On the side facing the contacting system 15, the energy storage cell 25 of the energy storage cell arrangement 20 has a storage cell side surface 70. The memory cell side surface 70 can be planar, for example, at least in sections and extend, for example, substantially in an xy plane.In addition, the contacting system 15 has a connecting pad 75 between the plate section 65 and the memory cell side surface 70.The connection pad 75 has a first pad side surface 80 on the side facing the plate portion 65, and a second pad side surface 85 on the side facing the energy storage cell assembly 20. On the second pad side surface 85, the connecting pad 75 is connected to the memory cell side surface 70 in a materially integral manner.The bonding pad 75 comprises at least one of the following materials: thermoplastic, wax, one or more polymeric materials, polypropylene, polyethylene, HDPE, LDPE, adhesive material, polyacrylate, polyacrylic, carboxymethylcellulose (CMC), thermosetting plastic, acrylate.It is particularly advantageous if the connecting pad 75 is designed to be thermally conductive. Here, the thermal conductivity of the connection pad 75 may be between 2 W / (m·K) and 500 W / (m·K). In addition, in the connection pad 75, a thermally conductive filler may be embedded in the above-mentioned material to increase the thermal conductivity of the connection pad 75.The plate portion 65 is arranged offset in the z direction from the main portion 55 in FIG. 2. The plate section 65 has its outer contour 105. In the embodiment, the outer contour 105 is rectangular.The connecting portion 60 connecting the main portion 55 to the plate portion 65 is obliquely disposed in the embodiment. The oblique arrangement and the offset in the z direction ensure that the plate portion 65 is movable with respect to the main portion 55. In particular, a movement, in particular in the longitudinal direction, can be compensated for by a thermal expansion of the energy storage cell 25.The plate portion 65 has the temperature sensor 50 disposed thereon. The temperature sensor 50 can be designed, for example, as a thermistor. The temperature sensor 50 is thermally connected to the associated energy storage cell 25 via the plate portion 65 and the connection pad 75. The temperature sensor 50 is designed to determine, in particular to measure, a temperature of the energy storage cell 25 assigned to it.The flexible printed circuit board 35 has an electrically conductive conductive conductive layer 90. The conductive layer 90 has at least one first conductor track 95 and at least one second conductor track 100. The first and second conductor tracks 95, 100 extend from the main section 55 via the connecting section 60 to the plate section 65. The temperature sensor 50 is electrically connected to the first and second conductor tracks 95, 100. In operation, the temperature sensor 50 provides information about the temperature of the associated energy storage cell 25, wherein the information is transmitted as a data signal via the first and second conductor tracks 95, 100.The conductive layer 90 has an electrically conductive material, for example copper, for forming the first and / or conductor track 95, 100.Spaced apart from the outer contour 105, the plate section 65 furthermore has a passage region 110. The passage region 110 is arranged laterally, in the embodiment in the transverse direction, directly adjacent to the temperature sensor 50. The passage region 110 can have a rectangular configuration, for example.The passage region 110 is configured to be transmissive for electromagnetic radiation 150, in particular for light radiation, in particular for laser radiation, having a wavelength of 350 nm to 950 nm. For this purpose, the passage region 110 can be formed continuously between a first side surface 120 of the plate portion 55 and a second side surface 125 of the plate portion 55 arranged opposite in the z direction. Here, continuous is understood to mean that electromagnetic radiation 150 entering via the first or second side face 120, 125 is attenuated by less than 10% on the way as far as the oppositely arranged side face 120, 125.In the embodiment, the passage region 110 has a through opening 115. The through-opening 115 can extend, for example, between the first side surface 120 of the plate section 65, which is facing away from the energy storage cell 25, as far as a second side surface 125 of the plate section 65, which faces the energy storage cell 25. In this case, the conductive layer 90, in particular the first and second conductor tracks 95, 100, is guided laterally past the passage region 110, in particular past the through-opening 115.FIG. 3 shows a sectional view along a sectional plane A-A, shown in FIG. 2, through the electrical energy store 10.In FIG. 3, the energy storage cell 25 is only shown in sections. Furthermore, for easier visibility, the flexible printed circuit board 35 is illustrated to be significantly larger, in particular thicker, than is shown in FIG. 2.In the embodiment, the flexible printed circuit board 35 is formed as a single-layer flexible printed circuit board 35 formed with only one conductive layer 90. The configuration of the flexible printed circuit board 35 has the advantage that a material thickness of the flexible printed circuit board 35 in the z direction is particularly small. It is of course also conceivable for the flexible printed circuit board 35 to be formed in multiple layers.The flexible printed circuit board 35 has a first cover layer 130, which adjoins the first side surface 120 in the embodiment. The first cover layer 130 is arranged on a side of the flexible printed circuit board 35 facing away from the energy storage cell arrangement 20. Further, the temperature sensor 50 is disposed on the first side surface 120.The first cover layer 130 is disposed on the conductive layer 90 and covers the conductive layer 90. The conductive layer 90 is electrically insulated and mechanically protected by the first cover layer on the side facing away from the energy storage cells 25. In this case, the first covering layer 130 is connected to the conductive layer 90 in a materially integral manner. For this purpose, for example, an adhesive bond can be arranged between the first covering layer 130 and the conductive layer 90.On the side of the conductive layer 90 facing away from the first cover layer 130, a substrate layer 140 is arranged. The substrate layer 140 comprises an electrically non-conductive material. For example, the substrate layer 140 may be made of a PI (polyimide) or a PET layer. The use of polyimide or polyethylene terephthalate (PET) makes the substrate layer 140 flexible.On the side facing away from the first cover layer 130, a second cover layer 145 may be arranged on the substrate layer 140. The second cover layer 145 can also be dispensed with. The second cover layer 145 is connected to the substrate layer 140 in a materially bonded manner, for example. A further conductive layer (not shown in FIG. 3 ) can also be arranged between the substrate layer 140 and the second cover layer 145.The substrate layer 140 or the second cover layer 145 adjoin the second side surface 125. The connecting pad 75 abuts the first pad side surface 80 on the second side surface and is connected thereto in a materially integral manner.In the embodiment, the conductive layer 90 is interrupted in the passage region 110. This is ensured, for example, by the through-opening 115 extending at least as far as the substrate layer 140 starting from the first side surface 120.In order to produce the electrical energy store 10 shown in FIGS. 1 and 2, the contacting system 15 and the energy store cell arrangement 20 are provided in a first method step.In a second method step, the connecting pad 75 is arranged on the memory cell side surface 70, such that the connecting pad 75 bears with the second pad side surface 85 essentially flat against the memory cell side surface 70.In a third method step, which follows the second method step or is carried out simultaneously with the second method step, the contacting system 15 with the plate section 65 is positioned on the energy storage cell arrangement 20 in such a way that the plate section 65 with the second side surface 125 bears substantially flatly on the first pad side surface 80.The contacting system 15 is pre-assembled in this case, so that the temperature sensor 50 is already electrically connected to the first and second conductor tracks 95, 100. Furthermore, the contact device 40 can be electrically connected to the flexible printed circuit board 35. The connection pad 75 can also be applied, for example, to the tough-viscous layer applied to the plate section 55. It would also be possible for the connecting pad 75 to be applied to the storage cell side surface 70 in a preparation step, for example in a tough viscous manner, and to adhere to the storage cell side surface. The connecting pad 75 comprises at least a first precursor of the material and preferably a second precursor of the materialIn a fourth method step following the third method step, which can also be dispensed with, the plate portion 55 is preferably pressed in the direction of the memory cell side surface 70, so that the second side surface 125 reliably bears against the first pad side surface 80 and the connecting pad 75 with the second pad side surface 85 bears flatly against the memory cell side surface 70.In a fifth method step, which is optionally carried out simultaneously with the fourth method step, electromagnetic radiation 150, which is designed, for example, as light radiation, in particular as laser radiation, is directed onto the passage region 110. The electromagnetic radiation 150 may have a wavelength of 350 nm to 950 nm, for example. Because the passage region 110 is continuous for the electromagnetic radiation 150, in particular for example the substrate layer 140 and / or the second cover layer 145 are transparent, the electromagnetic radiation 150 acts on the connecting pad 75 through the plate section 65.The first precursor and, for example, the second precursor, if present, is activated by the electromagnetic radiation 150, such that the first precursor is activated for reaction, for example with the second precursor, and forms the second material. In this case, when activated by means of the electromagnetic radiation 150, a starting energy can be introduced into a first partial region 155 of the connection pad 75 in order to activate the reaction of the first precursor, optionally with the second precursor, to form the material. The first subsection 155 of the connection pad 75 overlaps the passage region 110 in the z-direction. Here, an overlap in the z direction is understood to mean that, when two components are projected in the z direction into a projection plane which is oriented perpendicularly to the projection direction, for example an xy plane, the two components, for example the passage region 110 and the first subregion 155, overlap in the projection plane.Via the first partial region 155, which is formed overlapping with the passage region 110 in the z-direction, a second partial region 160 which is arranged laterally offset with respect to the first partial region 155 of the connection pad 75 is activated. The second partial region does not overlap in the z direction with the passage region 110.In a sixth method step, which follows the fifth method step, the first precursor and, if appropriate, the second precursor are cured to form the material of the connection pad 75. Here, curing is understood to mean that the first precursor is polymerized. In this case, the connecting pad 75 forms a cohesive connection on the first pad side surface 80 to the second side surface 125 and on the second pad side surface 85 to the memory cell side surface 70. During curing, fillers which may be embedded in the first precursor and increase the thermal conductivity may be additionally fixed, in order to ensure good thermal bonding of the energy storage cell 25 to the plate section 65 via the connecting pad 75.After the sixth step, the pressing of the plate portion 65 toward the energy storage cell 25 may be ended. The temperature sensor 50 is arranged particularly close to the energy storage cell 25 by the connecting pad 75, so that good thermal connection and a short thermal path of the temperature sensor 50 to the energy storage cell 25 are ensured. As a result, a temperature change, in particular a strong temperature rise, of the energy storage cell 25 can be detected early by the temperature sensor 50.In the embodiment, the through-opening 115 extends exclusively through the first cover layer 130 and the conductive layer 90. it is of course also possible for the first cover layer 130 to be provided also in the region of the through-region 110, provided that the first cover layer 130 is formed continuously for the electromagnetic radiation.FIG. 4 shows a sectional view along a sectional plane A-A shown in FIG. 2 through an electrical energy store 10 according to a second embodiment.The electrical energy store 10 is substantially identical to the embodiment shown in FIGS. 1, 2 to 3. Furthermore, the electrical energy store 10 shown in FIG. 4 can likewise be produced using the production method described within the scope of FIGS. 1, 2 to 3. In the following, only the differences of the second embodiment of the electrical energy store 10 shown in FIG. 4 from the first embodiment shown in FIGS. 1, 2 to 3 will be discussed.In the second embodiment, the through-region 110 is modified such that the through-hole 115 extends completely between the first side surface 120 and the second side surface 125. This ensures that the electromagnetic radiation 150 for activating the first precursor of the connection pad 75 for forming the material of the connection pad 75 is not weakened on the way to the connection pad 75.Furthermore, in the embodiment, exclusively a cohesive connection is ensured in the second sub-region 160 of the connection pad 75 on the second side surface 125, wherein the activation of the precursor of the connection pad 75 takes place via the first sub-region 155, as already explained in the context of FIGS. 1, 2 to 3.The production method described in FIGS. 1, 2, 3 to 4 and the configurations of the contacting system 15 described in FIGS. 1, 2, 3 to 4 make it possible to ensure particularly rapid and simple production of the electrical energy store 10. Furthermore, a complicated laser welding method for connecting the plate section 65, in particular for thermally connecting the temperature sensor 50 to the energy storage cell 25, can be avoided. Furthermore, a surface compensation and tolerance compensation in the unevenness of the storage cell side surface 70 is provided by the connecting pad 75, so that the thermal connection of the temperature sensor 50 to the energy storage cell 25 is improved.List of reference characters10 Electrical energy store 15 Contacting system 20 Energy store cell arrangement 25 Energy store cell 30 Carrier 35 Flexible printed circuit board 40 Connecting element 45 Cell connector arrangement 50 Temperature sensor 55 Main section 60 Connecting section 65 Plate section 70 Storage cell side surface 75 Connecting pad 80 First pad side surface 85 Second pad side surface 90 Conductive layer 95 First conductor track 100 Second conductor track 105 Outer contour 110 Passage region 115 Passage opening 120 First side surface 125 Second side surface 130 First cover layer 140 Substrate layer 145 Second cover layer 150 Electromagnetic radiation 155 First subregion 160 Second subregion

Claims

Contacting system (15) for an electrical energy store (10) of a vehicle, - wherein the contacting system (15) comprises at least one flexible printed circuit board (35), a connecting pad (75) and a temperature sensor (50), - wherein the flexible printed circuit board (35) comprises a passage region (110) in a plate section (65), - wherein the temperature sensor (50) is arranged on the plate section (65), - wherein the connecting pad (75) comprises a first pad side surface (80) and a second pad side surface (85) arranged opposite the first pad side surface (80), - wherein the connecting pad (75) abuts the plate section (65) on the first pad side surface (80), - wherein the connecting pad (75) is arranged on the passage region (110) in a first sub-region (155), wherein the connecting pad (75) is connected to the plate portion (65) in a materially bonded manner at least in a second sub-region (160) of the connecting pad (75) which is arranged offset with respect to the first sub-region (155), - wherein the second pad side surface (85) is connectable to an energy storage cell (25) in a materially bonded manner, - wherein the passage region (110) is configured to be transmissive for a predefined electromagnetic radiation (150), such that the electromagnetic radiation (150) can be introduced into the first sub-region (155) of the connecting pad (75) for activating the connecting pad (75).Contacting system (15) according to claim 1, - wherein the connecting pad (75) comprises at least one of the following materials: - thermoplastic, wax, one or more polymeric materials, polypropylene, polyethylene, HDPE, LDPE, adhesive material, polyacrylate, polyacrylic, carboxymethylcellulose (CMC), thermosetting plastic, acrylate.The contacting system (15) according to any one of the preceding claims, - wherein the connecting pad (75) is formed to be thermally conductive, unfortunately, and / or - wherein the connecting pad (75) is formed to be thermally conductive, unfortunately, and has a thermal conductivity of 2 W / (m·K) to 500 W / (m·K).Contacting system (15) according to one of the preceding claims, - wherein the plate section (65) has a first side surface (120) and a second side surface (125) arranged opposite the first side surface (120), - wherein the passage region (110) has a through-opening (115) which extends at least in sections between the first side surface (120) and the second side surface (125), - wherein the temperature sensor (50) is arranged on the first side surface (120) and the first pad side surface (80) of the connection pad (75) abuts on the second side surface (125).Contacting system (15) according to one of the preceding claims, - wherein the flexible printed circuit board (35) has a substrate layer (140) and at least one electrically conductive conductive conductive layer (90) having at least one conductor track (95, 100), - wherein the conductive layer (90) is arranged laterally offset at the passage region (110).Contacting system (15) according to claim 5, - wherein in the passage region (110) the substrate layer (140) is continuous for the electromagnetic radiation (150).Contacting system (15) according to claim 5 or 6, - wherein in the passage region (110) the passage opening (115) penetrates the substrate layer (140).Contacting system (15) according to one of the preceding claims, - wherein the flexible printed circuit board (35) has a connecting section (60) and a main section (55), - wherein the connecting section (60) adjoins the board section (65), - wherein the main section (55) and the board section (65) extend in two planes arranged offset with respect to one another, - wherein the connecting section (60) is arranged inclined with respect to the board section (65).Electrical energy store (10) for a vehicle, - wherein the electrical energy store (10) has an energy store cell arrangement (20) having at least one energy store cell (25) and a contacting system (15) according to one of the preceding claims, - wherein the electrical energy store cell (25) has a storage cell side surface (70) on a side facing the contacting system (15), - wherein the connecting pad (75) is arranged between the storage cell side surface (70) and the plate portion (65), - wherein the connecting pad (75) is bonded to the storage cell side surface (70) on a second pad side surface (85), - wherein the connecting pad (75) thermally connects the electrical energy store cell (25) to the temperature sensor.Method for producing an electrical energy store (10) according to Claim 9, - wherein the contacting system (15) according to one of Claims 1 to 8 and at least one energy store cell arrangement (20) having at least one energy store cell (25) are provided, - wherein the contacting system (15) is arranged on the energy store cell arrangement (20) in such a way that the connection pad (75) bears with the second pad side face (85) against a storage cell side face (70) of the energy store cell (25), - wherein electromagnetic radiation (150) is provided which is directed towards the passage region (110), - wherein the electromagnetic radiation (150) at least partially penetrates the passage region (110) and is introduced into the connection pad (75), wherein the electromagnetic radiation (150) activates the connecting pad (75) and the connecting pad (75) forms a cohesive connection to the memory cell side surface (70) at least on the second pad side surface (85).Method according to claim 10, - wherein the electromagnetic radiation (150) has a wavelength of 350 nm to 950 nm, - and / or - wherein the electromagnetic radiation (150) is a laser radiation.Method according to Claim 10 or 11, - wherein the electromagnetic radiation (150) acts on at least one first precursor of a material of the connection pad (75) in the first subregion (155) and activates the first precursor, - wherein the first precursor is activated from the first subregion (155) in the second subregion (160), - wherein the first precursor is cured to form the material.Method according to one of claims 10 to 12, - wherein the connection pad (75) thermally connects the temperature sensor (50) to the memory cell side surface (70) via the plate portion (65).

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