Cell connectors for an energy storage device and energy storage

Abstract

Cell connector (11a) for an energy storage device (3) for electrically contacting a first pole contact (22a) of a first energy storage cell (2a) and a second pole contact (22b) of a second energy storage cell (2b) of the energy storage device (3), in particular an energy storage device for a vehicle, comprising an electrically conductive base body (110) with a first contact surface (112a) for electrically contacting the first pole contact (22a) and a second contact surface (112b) for electrically contacting the second pole contact (22b), the base body (110) is overmolded in a partial area (110a) with a tempering structure (12) that enlarges the surface of the cell connector (11a), characterized in that the first and second contact surfaces (112a, 112b) are separated from one another by at least one recess (114) in the base body (110).

Description

[0001] The present invention relates to a cell connector according to the preamble of claim 1 and to an energy storage device, in particular an energy storage device for the automotive sector according to the preamble of claim 19 using a cell connector. Technological background

[0002] A central aspect of the development of electrically powered means of transport, such as electric vehicles, is the energy storage system. This requires energy storage systems with high power and energy density. Energy storage systems typically consist of a plurality of individual energy storage cells (e.g., lithium-ion battery cells) that are electrically interconnected. Energy storage systems generally require temperature management to ensure operation within an optimized temperature range. Energy storage cells typically have a narrow operating temperature range (e.g., between +15°C and +45°C). The functional safety, service life, and cycle stability of the energy storage cell, and thus the functional safety of the entire energy storage system, depend significantly on the energy storage cell remaining within this range. If the temperature exceeds a critical level, a condition known as "thermal runaway" occurs.Thermal runaway sets off an unstoppable chain reaction. The temperature rises dramatically within milliseconds, and the energy stored in the energy storage cell is suddenly released. This can result in temperatures of up to over 1000°C. The contents of the energy storage device become gaseous, resulting in a fire that is difficult to extinguish using conventional means. The danger of thermal runaway begins at a certain temperature (e.g., 60°C) and becomes extremely critical above a higher temperature threshold (e.g., 100°C). Consequently, energy storage systems, particularly those for electric vehicles, use an energy storage management system that not only controls and regulates the charging and discharging behavior of the energy storage cells, but also implements temperature management and emergency management measures in the event of a thermal runaway.To ensure the targeted release of gases in the event of thermal runaway, the gas-tight sealed energy storage cells can be equipped with vents. These vents can, for example, be designed as predetermined breaking points that allow gases to escape from the interior of the energy storage cell to the environment at a certain internal pressure. The escaping gases may contain electrolytes that can react with water to form hydrofluoric acid. To reduce the danger to surrounding components and / or people, such gases must be vented in a controlled and targeted manner.

[0003] To electrically connect the energy storage cells, energy storage devices have so-called cell connectors which, depending on the circuit type, electrically connect two or more poles of two or more energy storage cells. In a series connection, for example, the anode of one energy storage cell is connected to the cathode of another energy storage cell. In order to monitor and regulate the charge level of each energy storage cell, each cell connector can be electrically connected to the control and / or regulation electronics of the energy storage device. This allows the cell voltage of each individual energy storage cell to be measured and the charge level of the respective energy storage cell to be derived from the cell voltage. Furthermore, sensors, e.g. temperature sensors for monitoring the surface temperature of the energy storage cells, can also be provided and connected to the control and / or regulation electronics.In previous solutions, the control and / or regulation electronics are located in a separate module. Printed state of the art

[0004] From KR 10 2022 0 059 758 A, a connection frame extending over a plurality of battery cells of a vehicle battery is known. The connection frame is designed as an injection-molded body comprising individual, elongated busbars, provided separately for each pole contact, integrated into the entire connection frame. For this purpose, each busbar is overmolded with the frame at its distal end, with a cooling structure as an integral part of the entire frame. The cooling structure is intended to radiate heat. The busbars have a continuous, essentially rectangular shape.

[0005] DE 10 2021 106 125 A1 discloses a battery pack with overmolded busbars that provide parallel cooling paths. This includes an interconnect board assembly (ICBA), which, as an integral component, includes all the busbars intended for the battery module. Here, too, a distal end of each busbar is overmolded with the material of the interconnect board assembly. The busbars also have a continuous, essentially rectangular shape.

[0006] DE 10 2021 115 705 B3 discloses a battery for a motor vehicle in which the connection points of at least two battery cells are electrically connected to at least one busbar. The busbars are bonded to the battery housing via a thermal adhesive to dissipate heat from the busbar to the housing. This eliminates the need for cooling fluid channels.

[0007] DE 10 2007 063 178 A1 discloses a battery with a heat-conducting plate for controlling the temperature of the battery. The battery comprises a plurality of interconnected individual cells. The heat-conducting plate has holes and / or cutouts in the area of ​​the poles of the individual cells, through which the poles of the individual cells protrude or protrude. The heat-conducting plate is arranged between the individual cells and contact elements placed on the poles. Electrical cell connectors arranged pole by pole and / or a cell connector board are provided as contact elements for electrically connecting the poles of the individual cells. Furthermore, elastic elements and / or contact elements can be located on the top side of the heat-conducting plate. This sequence of individual layers must be clamped to the individual cells using screws during assembly. Assembly is therefore complex.

[0008] DE 10 2009 046 385 A1 discloses a battery with a degassing system. The degassing system is located on the side opposite the battery cell poles. There, a dedicated base plate with passages for degassing openings and a collecting basin for collecting the gases from the battery cells is located.

[0009] DE 10 2012 219 784 A1 discloses a battery module comprising a gas channel, a circuit board, and a battery module housing accommodating a plurality of battery cells. The gas channel is formed by a U-shaped profile with through-openings to the vents of the battery cells, as well as a circuit board that closes the U-shaped profile on the side facing away from the vents. The circuit board thus forms a wall of the gas channel and can come into direct contact with the gas when gas escapes from a gas outlet opening of a battery cell. During assembly, the circuit board is attached directly to the busbars. The U-shaped profile is not directly connected to the busbars. The disadvantage of this arrangement is that escaping gas can destroy the unprotected circuit board. Control and / or regulation of the battery module is no longer guaranteed in this case.Furthermore, no active temperature control of the battery cell surface or the cell connectors is provided.

[0010] EP 3 316 384 A1 discloses a circuit board arrangement according to the preamble of claim 1. A rigid circuit board is provided for control and / or regulation electronics, to which cell connectors for connecting the energy storage cells are directly applied. This direct connection of the cell connectors to the control and / or regulation electronics results in direct heat transfer from the electrical connections of the energy storage cells to the control and / or regulation electronics. Such an arrangement leads to unavoidable measurement deviations in voltage and temperature measurements.

[0011] Furthermore, a C-shaped, flexible circuit board carrying a temperature sensor element is attached to the rigid board. The flexible circuit board extends through a slot-shaped through-hole in the rigid board. The design is complex and costly, both in terms of the manufacturing of the individual components and the final assembly. Object of the present invention

[0012] The object of the above invention is to provide a cell connector for an energy storage device with improved temperature control. Solution to the task

[0013] The above object is achieved by the entire teaching of claim 1 and claim 19. Advantageous embodiments of the invention are claimed in the subclaims.

[0014] The invention relates to a cell connector for an energy storage device for electrically contacting a first pole contact of a first energy storage cell and a second pole contact of a second energy storage cell of the energy storage device, in particular an energy storage device for a vehicle, comprising an electrically conductive base body, preferably made of a flat material with a constant layer thickness, in particular of sheet metal, with a first contact surface which serves to electrically contact the first pole contact and a second contact surface which serves to electrically contact the second pole contact. According to the invention, the base body is provided in a partial region with a tempering structure which enlarges the surface of the cell connector, preferably overmolded. This ensures particularly good temperature control of the cell connector.Furthermore, according to the invention, the first and second contact surfaces are separated from each other by at least one recess. This recess allows the cell connector to exhibit a certain degree of elasticity. When the first and second contact surfaces are connected to energy storage cells, relative movements of the energy storage cells can be compensated for. Furthermore, the recess can shift the current flow toward the overmolded portion.

[0015] Advantageously, the base body can have a first side and a second side, and the temperature control structure can extend along the entire length of the second side. This configuration is advantageous if the cell connector does not have a power tap.

[0016] The first side of the base body extends in the contact direction of the energy storage cells.

[0017] In a suitable embodiment, the temperature control structure can comprise a plurality of temperature control ribs, temperature control knobs, temperature control pins, and / or temperature control webs. Depending on the temperature control fluid surrounding the temperature control structure, this can achieve particularly effective temperature control and / or flow of the temperature control fluid.

[0018] For this purpose, the tempering ribs, tempering knobs, tempering pins and / or tempering webs can expediently be arranged in series with one another, parallel to one another and / or at equal distances from one another.

[0019] Because the temperature control structure is made of a thermally conductive, electrically insulating material, in particular a thermally conductive, electrically insulating plastic, particularly good heat transfer and electrical insulation of the cell connector are achieved.

[0020] For additional temperature control of the surface of an energy storage cell, a contact element with a contact surface for contacting the surface of the energy storage cell can be provided and the contact element can be connected to the temperature control structure.

[0021] In an advantageous embodiment, the contact element can be part of the temperature control structure.

[0022] In an alternative embodiment, the contact element can be a contact plate, preferably made of sheet metal.

[0023] There can be a gap between the contact plate and the base body, and the temperature control structure can join the base body and the contact plate together in the area of ​​the gap. The gap can electrically separate the contact plate and the base body.

[0024] Because the first and / or second contact surface and the contact surface of the contact element are positioned at a height offset from one another, thermal and electrical contacting of the first and / or second contact surface to the pole contacts of the energy storage cell as well as thermal contacting of the contact element to the surface of the energy storage cell is enabled.

[0025] The height offset can expediently be formed by at least one bend of the contact element.

[0026] Advantageously, the at least one bevel can be provided on both sides of the tempering structure.

[0027] Particularly suitable are the base body and the contact element as stamped or cut parts, preferably laser-cut parts, from a common plate-shaped blank. This allows the base body and the contact element to be manufactured particularly cost-effectively without creating any waste during the production of the contact element.

[0028] In a further advantageous embodiment, the contact element can extend to at least one degassing opening of the first and / or second and / or last energy storage cell, preferably to the degassing openings of the first and second energy storage cells, preferably at least partially enclosing them.

[0029] Furthermore, the contact element can partially or completely enclose an energy storage cell through the pole contact.

[0030] The temperature control structure can conveniently form an interface to a thermal conditioning system.

[0031] In an advantageous embodiment, the thermal conditioning system can have at least one temperature control channel in which the temperature control structure of the cell connector can be positioned.

[0032] In a particularly advantageous embodiment, the electrically conductive base body can consist of a flat material, preferably in the form of a plate, with a constant layer thickness or of a bent flat material with a constant layer thickness or of a material with a changing layer thickness, in particular a bent material with a changing layer thickness.

[0033] Furthermore, the invention relates to an energy storage device, in particular an energy storage device for a vehicle, with a plurality of energy storage cells arranged in series, wherein a cell connector according to at least one of claims 1 to 19 is provided. Description of the invention based on exemplary embodiments

[0034] Advantageous embodiments of the present invention are explained in more detail below with reference to the drawing figures. They show: Fig. 1a a plan view of an energy storage device with cell connectors, omitting a temperature control structure; Fig. 1b a perspective view of an energy storage device with cell connectors omitting a temperature control structure from Fig. 1; Fig. 2a a perspective view of a cell connector from Fig. 1 with tempering structure; Fig. 2b a perspective view of a terminal-side cell connector not belonging to the invention from Fig. 1 with tempering structure; Fig. 3a a perspective view of a further embodiment of a temperature control structure of a cell connector; Fig. 3b a perspective view of a further embodiment of a temperature control structure of a cell connector; Fig. 3c a perspective view of a further embodiment of a temperature control structure of a cell connector; Fig. 3d a perspective view of a further embodiment of a temperature control structure of a cell connector; Fig. 4a a perspective view of a further embodiment of a cell connector; Fig. 4b a side view of the cell connector according to Fig. 4a; Fig. 5a a perspective view of a further embodiment of a cell connector; Fig. 5b a side view of the cell connector according to Fig. 5a; Fig. 6a a perspective view of a further embodiment of a cell connector; and Fig. 6b a perspective view of a cell connector according to Fig. 6a without tempering structure.

[0035] Fig. Figure 1 shows an energy storage device 3 in its entirety. This is, in particular, a battery, e.g., for an electric vehicle with an electric drive. The energy storage device has a plurality of energy storage cells 2a, 2b, 2z arranged in series.

[0036] The energy storage cells 2a, 2b, 2z each have two Fig. 1 has pole contacts 22a, 22b concealed by cell connectors 11a, 11b, namely a pole contact 22a for an anode and a pole contact 22b for a cathode. The pole contacts 22a, 22b can have a substantially flat surface or be formed as small plates.

[0037] Furthermore, Fig. 1 a control and / or regulation electronics 16, which is electrically connected to the cell connectors 11a, 11b via connecting elements 15.

[0038] The cell connectors 11a, 11b can, for example, be welded to the pole contacts 22a, 22b. Furthermore, the cell connectors 11a, 11b can have through-holes 111. These can be used for positioning when attaching the cell connectors 11a, 11b to the pole contacts 22a, 22b. Furthermore, the through-holes 111 can serve as inspection openings. If necessary, measuring leads can be attached through the through-holes 111 to threaded holes located below the through-holes on the pole contacts 22a, 22b. This allows, for example, the contact between the cell connectors 11a, 11b and the pole contacts 22a, 22b to be checked.

[0039] In the exemplary embodiment, fourteen energy storage cells 2a, 2b, 2z are shown, which are electrically connected to one another in a series circuit by the cell connectors 11a, 11b. For this purpose, the energy storage cells 2a, 2b, 2z are each arranged rotated relative to one another, so that the pole contact 22a of the anode of the energy storage cell 2a is opposite the pole contact 22b of the cathode of the adjacent energy storage cell 2b, or the pole contact 22b of the cathode of the energy storage cell 2b is opposite the pole contact 22a of the anode of the adjacent energy storage cell 2a. The pole contact 22b of the cathode of the first energy storage cell 2a is connected to the terminal cell connector 11b. The pole contact 22a of the anode of the first energy storage cell 2a is connected via the cell connector 11a to the pole contact 22b of the cathode of the adjacent, second energy storage cell 2b.The pole contact 22a of the anode of the second energy storage cell 2b is in turn connected via a cell connector 11a to the pole contact 22b of the cathode of the third energy storage cell, etc. The pole contact 22a of the anode of the last energy storage cell 2z is connected to the cell connector 11b. The cell connectors 11b are provided for electrically connecting the energy storage device 3 to an electrical load (not shown), e.g., the electric motor of an electric vehicle. The two cell connectors 11b thus form the energy storage connections, i.e., the cathode and anode of the entire energy storage device 3.

[0040] In alternative embodiments of an energy storage device 3, a different number of energy storage cells can be provided and / or the energy storage cells can be connected in parallel. For this purpose, the cell connectors 11a, 11b can, for example, connect the electrical connections 22a of the anodes of two or more energy storage cells or the electrical connections 22b of the cathodes of two or more energy storage cells to one another. The energy storage cells can also be arranged in a row with the same orientation, i.e. not rotated, so that the electrical connections of the cathodes of the energy storage cells of the energy storage device 3 are arranged along a first line and the electrical connections of the anodes of the energy storage cells are arranged along a second line running parallel to the first line.

[0041] The Fig. 2a and Fig. 2b show cell connectors 11a, 11b for electrically contacting the pole contacts 22a, 22b of the energy storage cells 2a, 2a, 2z with a tempering structure 12. In the embodiment according to Fig. 1a and Fig. 1b shows two terminal cell connectors 11b and thirteen cell connectors 11a.

[0042] The cell connectors 11a are each provided to electrically connect a pole contact 22a of an energy storage cell, e.g., 2a, to a pole contact 22b of an adjacent energy storage cell, e.g., 2b. For this purpose, the cell connectors 11a comprise a base body 110 with a first contact surface 112a and a second contact surface 112b, which are each connected, e.g., welded, to a pole contact 22a, 22b.

[0043] The two cell connectors 11b are provided to provide a contacting means on the first energy storage cell 2a and the last energy storage cell 2z to an electrical load (not shown), e.g., an electric motor of an electric vehicle, or to a neighboring energy storage device. The cell connectors 11b have a base body 113 with a contact surface 112a, which is connected, e.g., welded, to the pole contact 22b of the cathode of the first energy storage cell 2a or the pole contact 22a of the anode of the last energy storage cell 2z. Furthermore, the base body 113 has a current tap 110d. The current taps 110d of the two cell connectors 11b thus form the connections of the anode and cathode of the energy storage device 3.

[0044] The base bodies 110, 113 of the cell connectors 11a, 11b consist of an electrically conductive flat material with a preferably constant layer thickness, e.g., a sheet metal. The respective base body 110, 113 has a first side S1, S1' and a second side S2, S2' and is in each case in the region of the second side S2, S2' in a Fig. 2a and Fig. 2b, the partial area 110a concealed by the cell connector 11a, 11b is overmolded with a tempering structure 12 that enlarges the surface of the cell connector 11a, 11b. The tempering structure 12 has, for example, a plurality of tempering ribs 124a running parallel to one another.

[0045] In an alternative embodiment not shown, the base body 110, 113 can consist of a bent flat material with a constant layer thickness or a material with a changing layer thickness, for example a bent material with a changing layer thickness.

[0046] The temperature control structure 12 is preferably a thermally conductive, electrically insulating material, in particular plastic.

[0047] In the cell connector 11a, the temperature control structure 12 extends along the entire length L1 of the second side S2. In the cell connector 11b, the temperature control structure 12 extends only along the length L2 of the second side S2' in the region of the contact surface 112a.

[0048] A recess 114 can be provided between the contact surfaces 112a, 112b of the cell connector 11a. On the one hand, this recess shifts the current flow and the resulting heat into the partial area 110a overmolded by the temperature control structure 12. On the other hand, the base body 110 exhibits greater elasticity. Thermal expansion or relative movements of the adjacent energy storage cells 2a, 2b, 2z can thus be better compensated.

[0049] Furthermore, the base bodies 110, 113 of the cell connectors 11a, 11b can have recesses 115, e.g., in the form of crescent-shaped through-openings. These also increase the elasticity of the base bodies 110, 113.

[0050] The Fig. 3a to 3d show various embodiments of the tempering structure 12. Tempering wave structures 124b, tempering knobs 124c, tempering pins 124d or tempering webs 124e can be provided as the tempering structure.

[0051] The Fig. 4a, Fig. 4b, Fig. 5a, Fig. 5b, Fig. 6a, Fig. 6b show alternative embodiments of cell connectors 11a, in which an additional contact element 121a, 121b, 121c is provided, which is in direct contact with the top side 23 of the energy storage cell via a contact surface 122a, 122b, 122c. This allows for temperature control of the energy storage cells 2a, 2b, 2z.

[0052] The contact element 121a of the tempering structure 12 of Fig. 4a and Fig. 4b is injected around the end region of the base body 110 in such a way that its contact surface 122a rests on the surface of the energy storage cell or the height of the pole contact 22a, cf. Fig. 4b, bridged.

[0053] Fig. 5a and Fig. 5b and the Fig. 6a and Fig. 6b show two further alternative embodiments of cell connectors 11a with a contact element 121b, 121c, for example a contact plate.

[0054] According to Fig. 5a and Fig. 5b, the contact element 121b is overmolded by the temperature control structure 12 and has an offset 127a. The offset 127a can have essentially the same height as the pole contacts 22a, 22b with respect to the top side 23. This allows the base body 110 and the contact element 121b to be connected to one another, for example, on one plane, with the result that the contact element 121b rests directly on the top side of the energy storage cells. A gap 129a is provided between the base body 110 and the contact element 121b so that the base body 110 and the contact element 121b are not in direct contact with one another. The base body 110 and the contact element 121b are connected to one another via the temperature control structure 12. By means of an electrically non-conductive tempering structure 12, the base body 110 and the contact element 121b, 121c can thus be electrically insulated from each other.The contact element 121b may be made of the same material as the base body 110.

[0055] The variants of the Fig. 6a and Fig. 6b has an additional offset 127b between the two contact surfaces 112a, 112b. The contact element 121c extends to the vents 21 and surrounds the pole contacts 22a, 22b of the energy storage cells 2a, 2b. The additional offset 127b can further increase the thermal conduction between the contact element 121c and the temperature control structure 12, as well as the mechanical stability of the cell connector 11a.

[0056] The offset 127a, 127b can be generated, for example, by two bends of a plate-shaped raw material, e.g., a sheet, as can be seen from Fig. 6b, in which the tempering structure is omitted for illustrative reasons.

[0057] The base body 110 and the contact element 121b, 121c can advantageously be produced from a common plate-shaped blank, for example cut or punched.

[0058] Corresponding contact elements can also be provided for the end cell connectors 11b. The geometry of the contact element for a cell connector 11b can be easily adapted to the geometry of the cell connector 11b.

[0059] The cell connectors 11a, 11b or the temperature control structures 12 can further have an interface to a thermal conditioning system, for example, a temperature control channel (not shown), and can be connected to it, for example, by welding or adhesive bonding, preferably in the region of the temperature control structure 12. For connection to a cell connector 11a, 11b, the temperature control channel can, for example, have through-openings into which the cell connectors 11a, 11b and / or the temperature control structure 12 can be inserted. The interface to the thermal conditioning system can, for example, be provided on the temperature control structure 12. The interface can, for example, be designed such that the interface can close the through-openings of a temperature control channel. The temperature control channel can, for example, be provided to receive and / or conduct a temperature control fluid, for example, a temperature control liquid.

[0060] Alternatively, the cell connectors 11a, 11b can also be used without a temperature control channel. In this case, the ambient air can be used for temperature control, for example. LIST OF REFERENCE SYMBOLS 2a first energy storage cell 2b second energy storage cell 2z last energy storage cell 3 energy storage 11a Cell connector 11b Cell connector 111 Passage opening 110 basic bodies 113 basic bodies 110a sub-area 110d power tap 112a Contact surface 112b Contact surface 12 Tempering structure 121a Contact element 121b Contact element 121c contact element 122a Contact surface 122b Contact surface 122c contact surface 124a Tempering ribs 124b Tempering wave structure 124c tempering knobs 124d tempering pens 124e tempering bars 127a offset 127b Offset 129a gap 129b gap 15 connecting elements 16 Control and / or regulation electronics 21 Degassing opening 22a pole contact 22b Pole contact 23 Top

Claims

[1] Cell connector (11a) for an energy storage device (3) for electrically contacting a first pole contact (22a) of a first energy storage cell (2a) and a second pole contact (22b) of a second energy storage cell (2b) of the energy storage device (3), in particular an energy storage device for a vehicle, comprising an electrically conductive base body (110) with a first contact surface (112a) for electrically contacting the first pole contact (22a) and a second contact surface (112b) for electrically contacting the second pole contact (22b), the base body (110) is overmolded in a partial area (110a) with a tempering structure (12) that enlarges the surface of the cell connector (11a), characterized by , that the first and second contact surfaces (112a, 112b) are separated from one another by at least one recess (114) in the base body (110). [2] Cell connector (11a) according to claim 1, characterized bythat the base body (110) has a first side (S1) and a second side (S2) and the tempering structure (12) extends along the entire length (L1) of the second side (S2). [3] Cell connector (11a, 11b) according to at least one of the preceding claims, characterized by that the first side (S1, S1') of the base body (110, 113) extends in the contacting direction of the energy storage cells (2a, 2b, 2z). [4] Cell connector (11a, 11b) according to at least one of the preceding claims, characterized by that the tempering structure (12) comprises a plurality of tempering ribs (124a), in particular corrugated tempering ribs (124b), tempering knobs (124c), tempering pins (124d) and / or tempering webs (124e). [5] Cell connector (11a, 11b) according to claim 4, characterized bythat the tempering ribs (124a), tempering knobs (124c), tempering pins (124d) and / or tempering webs (124e) are arranged in series with one another, parallel to one another and / or equally spaced from one another. [6] Cell connector (11a, 11b) according to at least one of the preceding claims, characterized by that the tempering structure (12) consists of a thermally conductive, electrically insulating material, in particular a thermally conductive, electrically insulating plastic. [7] Cell connector (11a, 11b) according to at least one of the preceding claims, characterized by that a contact element (121a, 121b, 121c) with a contact surface (122a, 122b, 122c) is provided for contacting the surface of the energy storage cell (2a, 2b, 2z) and the contact element (121a, 121b, 121c) is connected to the temperature control structure (12). [8] Cell connector (11a, 11b) according to claim 7, characterized bythat the contact element (121a) is part of the tempering structure (12). [9] Cell connector (11a, 11b) according to claim 7, characterized by that the contact element (121b, 121c) is a contact plate, preferably made of a sheet metal. [10] Cell connector (11a, 11b) according to claim 7 or 9, characterized by that there is a gap (129a, 129b) between the contact element (121b, 121c) and the base body (110, 113), and the tempering structure (12) combines the base body (110, 113) and the contact element (121b, 121c) in the region of the gap (129a, 129b). [11] Cell connector (11a, 11b) according to at least one of claims 7 to 10, characterized by that the first and / or second contact surface (112a, 112b) and the contact surface (122a, 122b, 122c) of the contact element (121a, 121b, 121c) are positioned at a height offset from one another. [12] Cell connector (11a, 11b) according to at least one of claims 7 or 9 to 11, characterized bythat the height offset is formed by at least one bevel (127a, 127b) of the contact element (121b, 121c). [13] Cell connector (11a, 11b) according to claim 12, characterized by that the at least one bevel (127a, 127b) is provided on both sides of the tempering structure. [14] Cell connector (11a, 11b) according to at least one of claims 7 or 9 to 12, characterized by that the base body (110, 113) and the contact element (122b, 122c) are stamped parts or cut parts, preferably laser-cut parts, from a common plate-shaped blank. [15] Cell connector (11a, 11b) according to at least one of claims 7 to 14, characterized bythat the contact element (122a, 122b, 122c) extends to at least one degassing opening (21) of the first and / or second and / or last energy storage cell (2a, 2b, 2z), preferably to the degassing openings (21) of the first and second energy storage cell (2a, 2b, 2z), preferably at least partially enclosing them. [16] Cell connector (11a, 11b) according to at least one of the preceding claims, characterized by that the tempering structure (12) forms an interface to a thermal conditioning system. [17] Cell connector (11a, 11b) according to claim 16, characterized by that the thermal conditioning system has at least one temperature control channel in which the temperature control structure (12) of the cell connector (11a, 11b) is positioned. [18] Cell connector (11a, 11b) according to at least one of the preceding claims, characterized bythat the electrically conductive base body (110, 113) consists of a, preferably platelet-shaped, flat material with a constant layer thickness or a bent flat material with a constant layer thickness or a material with a changing layer thickness, in particular a bent material with a changing layer thickness. [19] Energy storage device (3), in particular energy storage device for a vehicle, with a plurality of energy storage cells (2a, 2b, 2z) arranged in series, characterized by that a cell connector (11a, 11b) according to at least one of claims 1 to 18 is provided.

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