Energy storage cell, energy storage cell assembly, motor vehicle, tie rod and method for producing energy storage cell assembly

Abstract

The invention relates to an energy storage cell (10) for a motor vehicle, comprising a housing (20) which defines an inner region (22); the invention relates to an energy storage cell (10) comprising a housing (20) and an end plate assembly (30) which is joined to the housing (20) and delimits an inner region (22), the end plate assembly having a connection terminal (32), the connection terminal (32) having a bore (36) on a surface (34) opposite the inner region (22), the bore (36) being open to the surroundings (U) of the energy storage cell (10), the connection terminal (32) having a first connection section (38) at the bore (36), the end plate assembly (30) has a first connection section (38) for detachably connecting the end plate assembly (30) to a pull rod (40) which is at least partially designed to be complementary to the first connection section (38). The invention also relates to an energy storage cell assembly, to a motor vehicle, to a tie rod and to a method for producing an energy storage cell assembly.

Description

Technical Field

[0001] The present invention relates to an energy storage battery cell, an energy storage battery cell assembly having the energy storage battery cell, a motor vehicle having the energy storage battery cell assembly, a pull rod for connecting with the energy storage battery cell, and a method for manufacturing the energy storage battery cell assembly. Background Art

[0002] Modern energy storage battery cells used in motor vehicle drive batteries, such as lithium-ion batteries (also referred to in the literature as lithium-ion secondary batteries), typically have a housing in the interior of which an electrolyte and an electrode assembly comprising an anode, a cathode, and a separator disposed therebetween are located. The housing of the energy storage battery cell (the so-called cell housing) is also referred to as a can ("can") in cylindrical energy storage battery cells. The energy storage battery cell also includes at least one connecting terminal (the so-called "pole") for contacting the energy storage battery cell via a cell connector. To electrically connect multiple energy storage battery cells in series and / or in parallel, the cell connector can make conductive contact with the connecting terminals of these multiple energy storage battery cells. Summary of the Invention

[0003] Against this background, the object of the present invention is to provide an energy storage battery cell to which a cell connector can be relatively easily connected, in particular while exerting the least possible mechanical load on the housing of the energy storage battery cell. Furthermore, the object of the present invention is to provide a corresponding energy storage battery cell assembly, a corresponding motor vehicle, a corresponding tie rod, and a method for producing the energy storage battery cell assembly.

[0004] This object is achieved by an energy storage battery cell according to claim 1 , an energy storage battery cell assembly having the features of claim 8 , a motor vehicle according to claim 9 , a tie rod according to claim 10 , and a method for producing an energy storage battery cell assembly having the features of claim 13 .

[0005] The energy storage battery cell is preferably constructed as a secondary battery and is provided for a vehicle drive battery, such as a lithium-ion battery. The energy storage battery cell comprises: a housing defining an interior area; and an end plate assembly joined to the housing and bounding the interior area, the end plate assembly having a connecting terminal. The connecting terminal has a hole on a surface opposite to the interior area that is open to the surroundings of the energy storage battery cell. The connecting terminal has a first connecting section at the hole. The first connecting section is preferably provided for detachably connecting the end plate assembly to a tie rod, the tie rod being constructed at least partially to be complementary to the first connecting section. Here, the tie rod preferably includes a second connecting section that is constructed to be complementary to the first connecting section.

[0006] This makes it possible to press the battery cell connector against the connection terminal from the outside without substantially introducing this pressure into the housing. That is, by establishing a connection between the first connecting section and the second connecting section, a reaction force opposite to the pressure can be applied to the end plate assembly by means of a pull rod. If the pressure and the reaction force are substantially equal in magnitude, the two forces cancel each other out, so that the mechanical load on the connection point between the housing and the end plate assembly and on the housing itself is as small as possible. As a result, the wall thickness of the housing can be reduced or the internal volume of the energy storage battery cell can be increased, thereby providing more space for the electrode assembly within a predetermined installation space. That is, an energy storage battery cell module having a plurality of energy storage battery cells proposed herein can actually be characterized by a higher energy density, and the energy storage battery cell module can still be easily manufactured (preferably automatically). In addition, the service life of the energy storage battery cells can be increased.

[0007] In the context of the present disclosure, the term "complementary" according to its general definition refers to two elements that complement each other. As explained in detail below, the complementary design of the first connecting section and the second connecting section can mean that the first connecting section can be connected to the second connecting section in a form-fitting or force-fitting manner.

[0008] The housing is preferably sealed by an end plate assembly. An electrode assembly and an electrolyte can be arranged in the interior of the housing. The electrode assembly preferably includes an anode, a cathode, and a separator (one-piece or multi-piece) arranged between the anode and cathode. The anode or cathode preferably comprises a corresponding metal electrode (e.g., copper on the anode side; aluminum on the cathode side), coated with an active material. Advantageously, the material of the anode of the electrode assembly comprises silicon, in particular silicon oxide or a silicon-carbon composite. This can effectively increase the energy density of the energy storage battery cell. The electrode assembly can be constructed in a wound (so-called jelly roll) or stacked (e.g., a so-called Z-stack). In particular (but not exclusively) in the latter case, the anode, cathode, and / or separator are preferably each constructed in multiple pieces. The current discharge element (so-called discharge flag) of the electrode assembly can make contact with the connection terminal on the inside (i.e., in the interior area or on the side of the connection terminal facing the interior area). This contact can be designed to be electrically conductive.

[0009] The energy storage battery cell is preferably configured as a cylindrical or prismatic battery cell. When the energy storage battery cell is observed along the surface normal of the surface, the hole (relative to the energy storage battery cell or the connecting terminal) is preferably arranged centrally (arranged in the center). Most preferably, under the same observation (i.e., when the energy storage battery cell is observed from above in the installed position), the hole is located at the center of the connecting terminal. If the energy storage battery cell is configured as a cylindrical battery cell, the central longitudinal axis of the energy storage battery cell preferably extends through the hole. Conversely, if the energy storage battery cell is configured as a prismatic battery cell, at least one main surface of the energy storage battery cell may extend through the hole. This central arrangement of the hole makes it possible to apply a counterforce, thereby effectively reducing the mechanical load acting on the housing of the energy storage battery cell.

[0010] The hole is preferably designed as a blind hole. This makes it relatively easy and efficient to seal the interior area. In particular, it is simple to prevent the interior area from communicating with the surrounding fluid-conducting environment through the hole. In a preferred embodiment, the end plate assembly, in particular the connecting terminal, includes a rivet. The rivet preferably has exactly one head; therefore, it preferably does not have a closed head. The rivet can be designed as a flat-head rivet to achieve the most compact possible design of the end plate assembly. The rivet can be arranged so that its head is located on the side of the connecting terminal opposite the surface. In other words, the head of the rivet can be located on the inside, in particular in the interior area. The end of the rivet opposite the head can form a portion of the aforementioned surface of the connecting terminal (opposite the interior area). At this end of the rivet, the connecting terminal can include a connecting section, which can be configured as a ring, for example. In particular, the connecting section can include a through-hole. The inner circumference of the connecting section can contact the outer circumference of the rivet and is preferably connected to the rivet by a material-locking connection (most preferably welded) at the interface thus formed. The hole is preferably configured in the rivet.Most preferably, the hole and the rivet are coaxially aligned with each other.

[0011] The end plate assembly can also have an end plate. The contour of the end plate can be defined by the inner circumference of the housing at the end of the housing on the connection terminal side. That is, the outer circumference of the end plate can be in contact with the inner circumference of the housing. Correspondingly, the end plate assembly can close the housing. The shape of the end plate preferably depends on the geometry of the energy storage battery cell. The end plate is preferably configured as a flat plate. The end plate can include an opening, in particular a through-hole. The rivet can extend through the through-hole. The through-hole can be arranged coaxially with the hole and / or the rivet. In order to seal the internal area, a sealing element (for example, an O-ring) can be clamped between the head of the rivet and the surface of the end plate facing the internal area. The main section of the rivet containing the hole can extend through the sealing element. The end plate can be connected to the housing materially at its interface with the housing (in particular welded).

[0012] On the side / face of the end plate opposite to the inner area, the connecting terminal can be indirectly supported by means of a seal. The seal can be passed through by a rivet. The seal is preferably also arranged coaxially with the rivet. The seal and / or the sealing element can be preferably constructed to be insulating. The current can be directly conducted from the electrode assembly to the connecting terminal (including the rivet) through the current outlet to reduce losses. Preferably, the seal may include a (non-planar) profile on its surface facing the inner area, which is complementary to the profile on the surface of the seal facing away from the inner area. For example, the seal may have protrusions on the surface facing the inner area, which can engage in corresponding recesses on the surface of the end plate facing away from the inner area. Similarly, the seal may have a profile on its surface away from the inner area, which is complementary to the profile of the surface of the connecting terminal facing the inner area / end plate at least in sections.

[0013] As a result, the connecting terminal can be supported on the end plate not only in the axial direction (i.e., in the main extension direction / along the axis of the rivet) but also in the transverse direction (i.e., perpendicular to the main extension direction / axis of the rivet), particularly when the rivet does not contact the end plate. This design concept thus offers a relatively high degree of flexibility in the selection of materials for the various components of the end plate assembly. Because the connecting terminal extends through the opening and is supported on both sides of the end plate (via sealing elements or seals), the connecting terminal can be secured to the end plate when the end plate is clamped.

[0014] In another variant, the end plate can have a first plate portion and a second plate portion. The energy storage battery cell according to this variant is preferably a cylindrical battery cell. The second plate portion can form a connection terminal and accordingly include a hole into which the tie rod can engage. The first plate portion can, together with an additional seal between the first plate portion and the housing (the additional seal can extend along the circumference of the first plate portion), seal the interior area of ​​the housing from the surrounding environment. The first plate portion and the second plate portion can contact each other in the edge area of ​​the energy storage battery cell. Starting from this contact point, the first plate portion can extend so that its distance from the second plate portion increases as the distance from the housing increases. On the surface of the first plate portion facing the electrode assembly, a contact plate for contacting by means of a current discharge element can be provided.

[0015] The pull rod proposed herein includes a second connecting section for connecting to the first connecting section of the energy storage battery cell. This connection is preferably non-destructively detachable. Accordingly, the connection is preferably form-locked and / or force-locked, but in particular not materially bonded. The second connecting section can be designed to complement the first connecting section. Thus, a form-locked or at least force-locked support for the clamping device (pressing sleeve) in the connecting terminal or rivet can be integrated into the hole. This makes it possible to reduce or avoid the introduction of forces into other battery cell components (insulation, seals, cover, battery cell housing).

[0016] To enable relatively quick and easy (especially automated) conductive connection of energy storage battery cells to the cell connectors, thereby minimizing mechanical load on the housing, tie rods can be used. As described in detail below in conjunction with the method for manufacturing an energy storage battery cell assembly, the tie rods, by engaging in the holes and establishing the connection between the first and second connection sections, can apply a force to the connecting terminal directed away from the electrode assembly. Consequently, the connecting terminal can be effectively pulled toward the cell connector by means of the tie rods connected thereto. Conversely, the clamping device (also known as a clamp) can press the cell connector toward the end plate assembly.

[0017] To enable the tie rod to be non-destructively secured to / fixed in the hole to the connecting terminal so that the connecting terminal can be pulled outward, the first connecting section can, for example, include a barb, a thread, and / or the (first) connecting half of a snap-on connection. In particular, the barb can be implemented as a constriction in the hole. In a particularly preferred embodiment, the inner diameter of the hole at the end facing away from the interior region / electrode assembly (the "outside") can be smaller than the inner diameter of the hole closer to the interior region. If the first connecting section includes a thread, the thread can be configured as an internal thread. Accordingly, the second connecting section can be configured as an external thread that mates with the internal thread. In a snap-on variant, the second connecting section can be similarly configured as a second connecting half that mates with the first connecting section. For example, in a snap-on variant, the second connecting section can be configured with a journal.

[0018] In particular, when the first connection section includes a barb, the pull rod can include a core and a sleeve for the core, or be constructed as a core that is at least partially introduced into the sleeve. In order to fix the pull rod to the connection terminal, the diameter of the pull rod at the second connection section can be variable by axial displacement of the sleeve. This can be achieved particularly cleverly by configuring the core at least partially in sections so that the diameter of the core increases in the direction of the longitudinal end of the core (which is provided for engagement in the hole). The second connection section can include the longitudinal end of the core and the longitudinal end of the sleeve. When the core is at least partially introduced into the sleeve, the sleeve can be displaced along the core in the direction of the longitudinal end of the core, so that the outer diameter of the sleeve at the longitudinal end of the sleeve increases. The sleeve can advantageously be grooved at the longitudinal end to facilitate expansion. Thus, an "expandable" pulling mechanism can be implemented with the help of the pull rod.

[0019] The energy storage battery cell assembly proposed herein includes at least one, and preferably a plurality of, energy storage battery cells as described in detail above. Furthermore, the energy storage battery cell assembly includes a battery cell connector, also described above, that is coupled to the connection terminals of the at least one energy storage battery cell. The energy storage battery cell assembly may be a (motor vehicle) energy storage device, in particular a drive battery for a motor vehicle.

[0020] Preferably, a plurality of the energy storage battery cells are provided and connected by means of a battery cell connector. The battery cell connector has a through-hole that overlaps with the hole in the connecting terminal. The through-hole of the battery cell connector can be aligned with / in line with the hole in the connecting terminal (particularly when viewed normal to the surface). Therefore, when the battery cell connector is mounted on the energy storage battery cell, the tie rod can quickly and efficiently engage the hole. The battery cell connector is preferably engaged with the connecting terminal using a tie rod and / or at least one clamping device. The battery cell connector is preferably connected to the connecting terminal by a material-locking connection, in particular by welding.

[0021] The motor vehicle proposed herein is preferably a land, water, or air vehicle, in particular a commercial vehicle or a passenger car. The motor vehicle comprises the energy storage battery cell assembly (or energy storage device) described in detail above. The energy storage battery cell assembly / energy storage device is preferably designed as a flat storage device. This device can be arranged in the floor area of ​​the motor vehicle, in particular between two adjacent axles (in particular the front and rear axles) of the motor vehicle.

[0022] In order to manufacture an energy storage battery cell assembly, in particular the above-mentioned energy storage battery cell assembly, a method is proposed herein, which includes the following steps, which can preferably be performed in the following order: providing the energy storage battery cell described in detail above and the pull rod described in detail above; arranging a battery cell connector having a through hole on the connecting terminal so that the through hole overlaps with the hole of the connecting terminal; connecting the first connecting section with the second connecting section; clamping the connecting terminal and the battery cell connector by applying a first force directed away from the inner area to the pull rod and applying a second force directed opposite to the first force to the connecting terminal; and constructing a - in particular a fixed - joining connection between the battery cell connector and the connecting terminal.

[0023] Furthermore, the method may include the above-mentioned features of the energy storage battery cell, or include steps for constructing these features. For example, the method may include establishing the joint connection between the battery cell connector and the connection terminal as a welded connection. That is, in this step, the battery cell connector can be welded to the connection terminal. In particular, the battery cell connector and the connection terminal can be welded by means of resistance welding. This can be achieved very cleverly in that the pull rod serves as the first electrode of the resistance welding device, and the second force is generated by a clamping device that also serves as the second electrode of the resistance welding device. When using, for example, tungsten carbide compounds in resistance welding, relatively large clamping forces are achieved, which can be balanced by means of a pulling mechanism. In contrast, if the battery cell connector and the connection terminal are welded by means of laser welding, the laser welding process can be performed simultaneously with the clamping of the connection terminal and the battery cell connector. Advantageously, clamping can reduce the distance between the components to be welded to achieve good current conduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Preferred embodiments of an energy storage battery cell, an energy storage battery cell assembly, a motor vehicle, a drawbar, and a method for manufacturing an energy storage battery cell assembly are now explained in more detail with reference to the accompanying schematic, non-scale drawings, in which:

[0025] Figure 1 A variant of an energy storage cell is shown in cross section, wherein the energy storage cell is contacted by means of a cell connector;

[0026] Figure 2 Shows the device in different states Figure 1 The pull rod of the energy storage battery cell;

[0027] Figure 3 Shown during the manufacture of energy storage battery cell components Figure 1 Energy storage battery cells together with Figure 2 The tie rod in which the connecting terminal is welded to the battery cell connector by means of laser welding;

[0028] Figure 4 Shown during the manufacture of energy storage battery cell components Figure 1 Energy storage battery cells together with Figure 2 a tie rod in which the connecting terminal is welded to the battery cell connector by resistance welding through the tie rod;

[0029] Figure 5 A further variant of an energy storage cell is shown in a detailed cross-sectional view, wherein the energy storage cell is designed as a cylindrical cell;

[0030] Figure 6 Show Figure 5 an energy storage battery cell in which the tie rod engages with a hole of a connection terminal;

[0031] Figure 7 Shows multiple basis Figure 1 Energy storage battery monomer components of energy storage battery monomers;

[0032] Figure 8 Shown with Figure 7 Motor vehicles for transporting energy storage battery cells; and

[0033] Figure 9 A method for manufacturing an energy storage battery cell assembly is shown. DETAILED DESCRIPTION

[0034] Figure 1 An energy storage cell 10 is shown, which is in its Figure 2 The pull rod 40 is connected to the battery cell connector 102. The energy storage battery cell 10 and the battery cell connector 102 form a Figure 8 The energy storage battery cell assembly 100 (energy storage) of a motor vehicle 200 (here a passenger car) is shown in FIG. The energy storage battery cell assembly 100 may include a plurality of such energy storage battery cells 10, which are connected by means of the same battery cell connector 102 (see FIG. Figure 7 ). In this case, the energy storage cell 10 is designed as a prismatic cell without limiting the generality and comprises a housing 20 which defines an interior area 22 for accommodating an electrode assembly 24 and an electrolyte (not shown). The longitudinal sides (longitudinal walls) of the cell housing 12 can be parallel to one another and Figure 1 The main plane of the prismatic cell (central longitudinal plane) extends parallel to these longitudinal sides.

[0035] The energy storage battery cell 10 further includes an end plate assembly 30 joined to the housing 20, which defines the interior area 22. The housing 20 has an upper side ( Figure 1The end plate assembly 30 comprises an end plate 54, which is connected to the inner circumference of the housing 20 at its outer circumference by material locking, in particular by welding. The end plate 54 (for each pole) comprises at least one opening 56, through which a respective connection terminal 32 of the energy storage battery cell 10 extends. That is, if multiple poles / connection terminals 32 are provided, a corresponding opening 56 can be assigned to one connection terminal 32. What is described below with respect to the connection terminal 32 / opening 56 can apply to each connection terminal 32 or each opening 56. The connection terminal 32 is not only on the outside ( Figure 1 Upper middle) and inside ( Figure 1 The connecting terminal 32 is supported on the end plate 54 (center bottom). In particular, the connecting terminal 32 can indirectly contact the end plate 54 via a sealing element 33 (here, an O-ring; on the inside relative to the energy storage battery cell 10) and / or a seal 60 (on the outside relative to the energy storage battery cell 10). The sealing element 33 or seal 60 can be clamped between a section of the connecting terminal 32 and the end plate 54. Thus, the connecting terminal 32 can be stably fixed to the end plate 54 in this manner.

[0036] The connection terminal 32 has a hole 36 on the (outer) surface 34 opposite the inner region 22, which is open to the surroundings U of the energy storage battery cell 10. In this variant, the hole 36 is arranged centrally relative to the energy storage battery cell 10 or to the connection terminal 32 (i.e., the relevant pole of the energy storage battery cell) when the energy storage battery cell 10 is viewed along the surface normal of the surface 34. Preferably, the hole 36 is designed as a blind hole, although the hole 36 can alternatively be designed as a through hole in the plate part of the connection terminal 32 (see Figure 5 The connecting terminal 32 comprises a first connecting section 38 at / in the region of the hole 36 for detachably connecting the end plate assembly 30 to a tie rod 40 , which is designed at least in sections to be complementary to the first connecting section 38 .

[0037] Currently, the connecting terminal 32 has a rivet 50, in particular a flat-head rivet. The rivet 50 includes a head 52, which is arranged on the inner side relative to the energy storage battery cell 10. The current discharge element 26 of the electrode assembly 24 contacts the head 52. The (cylindrical) main section 55 of the rivet 50, which extends from the head 52 in the direction of the surrounding environment U of the energy storage battery cell through the end plate 54, includes a hole 36 on its surface opposite the head 52. A sealing element 33 is clamped between the head 52 and the surface of the end plate assembly 30 that delimits the inner area, in particular the end plate 54. In this way, the inner area 22 can be sealed effectively, simply and in a space-efficient manner relative to the opening 56 in the end plate 54. Accordingly, the connecting terminal 32 passes through the opening 56 and is fixed to the end plate when the end plate 54 is clamped.

[0038] On the outside of the end plate 54, the connecting terminal 32 is indirectly supported by a seal 60 on the surface 58 of the end plate 54 opposite the inner region 22. The main section 55 of the rivet 50 extends toward the outside of the end plate 54 through the seal 60 and (at least partially) through the connecting section 35 of the connecting terminal 32. The connecting section 35 of the connecting terminal 32 clamps the seal 60 against the surface 58 of the end plate 54 to provide additional sealing for the energy storage battery cell 10. The seal 60 has a profile on its underside that complements the profile on the surface 58 to counteract lateral displacement of the seal 60 under load. The main section 55 is joined to the connecting section 35, in particular, is connected thereto by a material-locking connection (preferably welded).

[0039] In order to connect the cell connector 102 to the energy storage battery cell 10 as firmly as possible, in particular to weld it thereto, it is advantageous to press the cell connector 102 (axially) against the connecting terminal 32 by means of a clamping device 106. In this way, the gap between the components to be connected can be reduced. In order not to introduce the required pressure (hereinafter also referred to as the second force 47) into the housing 24, it is provided that Figure 2 The tie rod 40 is introduced into the hole 36 with its second connecting section 42 complementary to the first connecting section 38 (here, to the hole 36) and, by virtue of this connection, is connected there to the connecting section 35 in a form-fitting and / or force-fitting manner. The clamping device 106 can advantageously be configured as a clamping sleeve. As shown in FIG. 3 , the inner diameter of the clamping sleeve is preferably larger than the outer diameter of the tie rod 40. The tie rod 40 is arranged coaxially with the clamping sleeve.

[0040] Currently, if Figure 1 As shown in FIG, the first connecting section 38 includes a barb onto which the second connecting section 42 of the tie rod 40 can engage. Instead of or in addition to the barb, the second connecting section 42 can be configured as a connecting half with a thread, in particular an external thread, or a snap-fit ​​connection. The battery cell connector 102 has a through-hole 104 that is aligned with the hole 36 (i.e., overlaps with the hole 36 of the connecting terminal 32).

[0041] Figure 2 The tie rod 40 is shown in two detailed views. The tie rod 40 comprises a second connecting section 42 for preferably non-destructively detachable connection with the Figure 1The second connecting section 42 is generally configured to be complementary to the first connecting section 38. In the preferred design, the tie rod 40 is configured with a core 44 and a sleeve 46 for the core 44. The core 44 is configured at least in sections so that the diameter of the core 44 increases in the direction of the longitudinal end 48 of the core 44. In particular, the core 44 has a longitudinal end 48 provided for engagement in the hole 36, at which the cross section of the core 44 is larger than the cross section of the main part 45 of the core 44 away from the longitudinal end 48. Similarly, the sleeve 46 has a longitudinal end 49 provided for engagement in the hole 36, at which the sleeve 46 can expand.

[0042] When the core 44 is at least partially introduced into the sleeve 46 (see Figure 2 , middle), while maintaining this engagement, the sleeve 46 can be displaced along the core 44 ("on the core") in the direction of the longitudinal end 48 of the core 44, so that the outer diameter of the sleeve 46 at the longitudinal end 49 of the sleeve 46 increases (see Figure 2 , right). The second connecting section 42 of the core 44 comprises two longitudinal ends 48, 49. In order to anchor the tie rod 40 to the connecting terminal 32 by establishing a positive and / or force-locking connection, the core 44 can first be brought to its Figure 3 or Figure 4 The sleeve 46 can then engage with the core 44 and be displaced in the direction of the connection terminal 32. When the longitudinal end 49 of the sleeve 46 reaches the longitudinal end 48 of the core 44, the pull rod 40 is Figure 3 and Figure 4 In order to resist the second force 47, the pull rod 40 can be pulled, that is, a first force 43 directed antiparallel to the second force 47 is applied to the pull rod 40 (see Figure 3 ). This results in the connection terminal 32 and the battery cell connector 102 being clamped (see step 308 of the method explained below).

[0043] exist Figure 3 In a variant of the embodiment, the battery cell connector 102 is welded to the connecting terminal 32 by means of laser welding. The laser beam 108 can form a joint connection 110 adjacent to and on the outside of the holding-down device 106. Figure 4 In a modification of , the joining connection 110 is established by resistance welding. In this case, the hold-down device 106 / hold-down sleeve forms a first welding electrode, and the pull rod 40 forms a second welding electrode, through which current flows during welding, respectively.

[0044] Figure 5The energy storage battery cell 10 shown in sections in the middle is Figure 1 The energy storage battery cell 10 in the embodiment of the present invention is different in that it is configured as a cylindrical battery cell. The connection terminal 32 of this energy storage battery cell 10 does not include a rivet 40. The end plate assembly 30 has a first plate portion that configures the inner side of the end plate 54. In addition, the end plate assembly 30 has a second plate portion that configures the outer side of the connection terminal 32. The first plate portion and the second plate portion are in contact with each other in the edge region of the housing 20 and are spaced apart from each other in the region of the central longitudinal axis A of the energy storage battery cell 10. In the edge region, a seal is also provided between the first plate portion and the second plate portion and the housing 20 for sealing the inner region 22.

[0045] In the region of the central longitudinal axis A, the second plate part preferably projects axially beyond the longitudinal ends of the housing 20 in order to enable contact as easily as possible via the battery cell connector 102. In this variant, the central longitudinal axis A also extends through the opening 36. The current discharge element 26 of the electrode assembly 24 is connected to the first plate part (only) indirectly via the current collecting element 28. Figure 6 It shows that, by means of the pulling mechanism of the pull rod 40 (the pulling mechanism is constructed Figure 5 The connection terminal 32 of the cylindrical energy storage battery cell 10 is used for the connection between the battery cell connector 102) basically corresponds to the connection between the cylindrical energy storage battery cell 10 and the battery cell connector 102. Figure 3 Explain the pulling mechanism. In addition, Figure 5 The energy storage battery cell 10 has Figure 1 All the features of the energy storage battery cell 10 in the embodiment of the present invention. In addition, Figure 2 The tie rod 40 is also used Figure 5 In this variant, the inner edge of the hole 36 serves as a first connecting section 38, on which the tie rod 40 acts (see Figure 6 ).

[0046] Figure 7 The energy storage battery cell assembly 100 is shown. The energy storage battery cell assembly has multiple Figure 1 The energy storage battery cells 10 are electrically connected by means of a common battery cell connector 102. Here, the energy storage battery cells 10 can be connected in different ways, such as in series or in parallel. In this way, the energy storage battery cell assembly 100 can be advantageously produced in an automated or semi-automated manner. The energy storage battery cell 10 includes the above-mentioned Figures 1 to 4 In a modified embodiment not shown, the energy storage battery cell assembly 100 includes a plurality of Figure 5 Energy storage battery cell 10. Each such energy storage battery cell assembly 100 can be Figure 8In the motor vehicle 200 , which is shown simplified in FIG, the cam is installed in the floor region between the front axle and the rear axle of the motor vehicle 200 .

[0047] The energy storage battery cell assembly 100 can be Figure 9 First, in a first step 302, an energy storage battery cell 10 and a tie rod 40 as shown in one of the above figures are provided, for example Figure 2 The tie rod 40 in the battery cell 10 can be provided in multiple energy storage battery cells; the following description of the energy storage battery cell 10 applies to each of the energy storage battery cells. In step 304, the battery cell connector 102 is positioned externally on the energy storage battery cell, such that its through hole 104 at least overlaps with the hole 36 of the connecting terminal 32, preferably leaving it completely accessible or exposed. Subsequently, the first connecting section 38 is connected to the second connecting section 42 (step 306).

[0048] Then, in step 308, a first force 43 directed away from the inner region 22 is applied to the tie rod 40 and a second force 47 directed opposite to the first force 43 is applied to the connecting terminal 32 (see Figure 3 ), the connecting terminal 32 and the battery cell connector 102 are clamped (pressed against each other) by means of the clamping device 106 and the tie rod 40. Finally, in step 310, a (especially fixed) joint connection is established between the battery cell connector 102 and the connecting terminal 32. This step may include, for example, combining Figure 3 and Figure 4 The battery cell connectors 102 are welded to the connection terminals 32 as explained. Subsequently, the clamping can be released and the tie rods 40 can be removed (step 312, optional).

[0049] For reasons of readability, the phrase "at least one" is partially omitted in this disclosure for simplicity. If a feature is described in the singular or indefinite form (e.g., a connection terminal, etc.), the plural form is also disclosed (e.g., at least one connection terminal, i.e., one connection terminal or a plurality of connection terminals). Here, "at least partially / partially" means partially / partially or completely. In the context of this disclosure, the term "substantially" includes both the exact characteristic or exact value, respectively, and deviations that are not significant for the function of the characteristic / value, such as deviations due to manufacturing tolerances.

[0050] The foregoing description of the present invention is for illustrative purposes only and is not intended to limit the present invention. Within the scope of the present invention, various changes and modifications may be made without departing from the scope of the present invention and its equivalents.

Claims

1. An energy storage battery cell (10) for a motor vehicle (200), the energy storage battery cell comprising: a housing (20) defining an interior region (22); and an end plate assembly (30) joined to the housing (20) and delimiting the inner region (22), the end plate assembly having connection terminals (32), The connection terminal (32) has a hole (36) on a surface (34) opposite the inner region (22) that is open toward the surroundings (U) of the energy storage battery cell (10). The connecting terminal (32) has a first connecting section (38) at the hole (36), which is used to detachably connect the end plate assembly (30) to a tie rod (40), which is constructed at least partially to be complementary to the first connecting section (38).

2. The energy storage battery cell (10) according to claim 1, wherein: When the energy storage battery cell (10) is viewed along the surface normal of the surface (34), the hole (36) is arranged centrally with respect to the energy storage battery cell (10) or with respect to the connection terminal (32), And / or, the hole (36) is configured as a blind hole.

3. Energy storage battery cell (10) according to any one of the preceding claims, in, The connecting terminal (32) includes a rivet (50), The head (52) of the rivet (50) is arranged on a side of the connecting terminal (32) opposite to the surface (34).

4. Energy storage battery cell (10) according to the preceding claim, wherein: The hole (36) is formed in the rivet (50).

5. Energy storage battery cell (10) according to any one of the preceding claims, in, The end plate assembly (30) also has an end plate (54) with an opening (56), The connecting terminal (32) passes through the opening (56) and is fixed on the end plate (54) when the end plate (54) is clamped.

6. Energy storage battery cell (10) according to the preceding claim, wherein: The connecting terminal (32) is supported indirectly by means of a seal (60) on a surface (58) of the end plate (54) that is opposite the inner region (22).

7. The energy storage battery cell (10) according to any one of the preceding claims, wherein: The first connection section (38) comprises a connection half of a barb, thread and / or a bayonet fitting.

8. An energy storage battery cell assembly (100), comprising: at least one energy storage battery cell (10), the energy storage battery cell being an energy storage battery cell according to any one of the preceding claims, and a battery cell connector (102) coupled to a connection terminal (32) of the at least one energy storage battery cell (10), The battery cell connector (102) has a through hole (104) that overlaps with the hole (36) of the connecting terminal (32).

9. A motor vehicle (200) comprising the energy storage battery cell assembly (100) according to the preceding claim.

10. A tie rod (40) comprising a second connecting section (42) for detachably connecting, preferably non-destructively, to a first connecting section (38) of an energy storage cell (10) according to any one of claims 1 to 8, in, The second connecting section (42) is configured to be complementary to the first connecting section (38).

11. The tie rod (40) according to claim 10, wherein: The connection is a form-fitting and / or force-fitting connection.

12. A tie rod (40) according to claim 10 or 11, comprising a core (44) and a sleeve (46) for the core (44), in, The core (44) is constructed at least in sections such that the diameter of the core (44) increases toward a longitudinal end (48) of the core (44). wherein the second connecting section (42) includes a longitudinal end portion of the core (44), In a state where the core (44) is at least partially introduced into the sleeve (46), the sleeve (46) can be displaced along the core (44) toward the longitudinal end of the core (44), so that the outer diameter of the sleeve (46) at the longitudinal end of the sleeve (46) increases.

13. A method (300) for manufacturing an energy storage battery cell assembly, comprising the following steps: Providing (302) an energy storage battery cell (10) according to any one of claims 1 to 7 and a pull rod (40) according to claim 10, 11 or 12; Arranging (304) a battery cell connector (102) having a through hole (104) on a connection terminal (32) such that the through hole (104) overlaps with a hole (36) of the connection terminal (32); Connecting (306) the first connecting section (38) to the second connecting section (42); clamping (308) the connecting terminal (32) and the battery cell connector (102) by applying a first force to the tie rod (40) directed away from the interior region (22) and applying a second force to the connecting terminal (32) directed opposite to the first force; and A joint connection, in particular a fixed one, is formed (310) between the battery cell connector (102) and the connecting terminal (32).

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