Battery cell with integrated temperature control chamber

Abstract

Battery cell (10) for an electrical energy storage device (20) for a motor vehicle, comprising: a cell housing (12); a temperature control chamber (14) for flow with a temperature control fluid, wherein the temperature control chamber (14) is formed at least partially by the cell housing (12); and at least one guide element (16) arranged in the temperature control chamber (14) for directing the temperature control fluid in the temperature control chamber (14), wherein: the cell housing (12) is formed at least partially as a double wall, comprising an inner wall (12a) and an outer wall (12b) spaced apart from the inner wall (12a); and the temperature control chamber (14) is arranged between the inner wall (12a) and the outer wall (12b), wherein the at least one guide element (16): a) is deformable by deformation of the inner wall (12a);and / or b) is designed to decouple the outer wall (12b) from any deformation and / or movement of the inner wall (12a) that occurs when the inner wall (12a) is subjected to a load; and / or c) is designed to interrupt and / or reduce the transmission of the load to the outer wall (12b) when the inner wall (12a) is subjected to a load.

Description

The invention relates to a battery cell and an electrical energy storage device comprising such a battery cell. Electrical energy storage devices (e.g., high-voltage batteries) for motor vehicles typically consist of a large number of electrically interconnected or connectable battery cells. These battery cells may have a rigid cell casing, e.g., made of aluminum, which usually houses an electrode stack or coil and an electrolyte. The cell casing prevents electrolyte leakage and protects the battery components from environmental influences such as water or dirt. To ensure optimal and long-term battery cell performance, thermal conditioning is essential. One method involves immersing the battery cells directly in a heat-conducting (and preferably electrically non-conductive) fluid (so-called immersion cooling). However, this requires significant effort to ensure the components are airtight. Alternatively, the battery cells can be positioned on a temperature control plate with a channel structure through which a liquid heat transfer fluid flows (so-called bottom plate cooling). A disadvantage of this method is that the battery cells are only cooled on one side at the bottom. During charging and discharging, heat can also be generated on the side of the cell, which cannot be effectively dissipated by bottom-only cooling. From DE 10 2018 215 580 A1, a cell housing for a battery cell of a high-voltage battery of an electrically powered motor vehicle is known, with housing walls which enclose a housing interior for receiving a galvanic cell, wherein at least one of the housing walls is double-walled and the cell housing has a temperature control connection which is fluidically coupled to the at least one space formed by the double-walled housing wall and through which a temperature control medium for temperature control of the galvanic cell can be supplied to and / or removed from the at least one space. US Patent 5,460,900 A discloses a lead-acid storage battery for starting, lighting, and ignition applications that minimizes convection-induced heat transfer from the environment surrounding the battery under the vehicle hood to the battery itself and comprises an injection-molded, integral plastic container with a multi-wall configuration in which an inner container holds the battery cell elements and at least one outer container, spaced apart from the inner container, provides at least one liquid compartment to allow liquid flow through the liquid compartment to achieve the desired thermal regulation, the liquid flow path being created by a series of spaced liquid guide vanes. US Patent 6,376,126 B1 discloses a composite battery container for housing one or more cell elements comprising alternating positive and negative plates interspersed with separator material. The composite battery container includes a battery housing that defines one or more cell compartments. The cell compartments have elastic, flexible spacer and plate support ribs that are integrally molded into the sides and bottom of the cell compartments but have different material properties than the battery housing. The battery housing is made of a rigid, inexpensive plastic, while the ribs are made of a flexible thermoplastic elastomer. The flexible ribs deform elastically when a cell element is inserted into the cell compartment and return to a substantially undeformed, originally shaped position when the cell element is removed.The ribs are formed in every suitable orientation and at every suitable acute or obtuse angle to the cell compartment walls. From DE 10 2017 201 015 A1, a battery device is known comprising at least one battery cell with a cell housing and a temperature control device for maintaining the temperature of the respective battery cell, which has several channels for conveying a temperature control medium. Improved thermal management is achieved if, at least in one battery cell, at least one channel is integrally formed, at least partially, in a wall of the cell housing. Accordingly, the object of the invention is to provide an improved battery cell. A preferred object of the invention is to provide a battery cell that can be temperature-controlled as effectively and over as large an area as possible, and which in particular enables targeted cooling of the cell sides in a simple manner. These problems can be solved using the features of the independent claims. Advantageous embodiments and applications of the invention are the subject of the dependent claims and are explained in more detail in the following description with partial reference to the figures. A first independent aspect of the present disclosure relates to a battery cell for an electrical energy storage device (e.g. for a high-voltage battery) for a motor vehicle. The battery cell has a cell housing, preferably prismatic. The cell housing can be made of plastic and / or aluminum, but this is only an example. Furthermore, the battery cell has a temperature control chamber through which a temperature control fluid (e.g., cooling water) flows. The temperature control chamber is formed at least partially by the cell housing. For example, the temperature control chamber can be integrated at least partially into the cell housing and / or be at least partially bounded by the cell housing. The battery cell is characterized by at least one (e.g., rod-shaped) guide element arranged in the temperature control chamber to direct the temperature control fluid. For example, the at least one guide element can be designed and / or arranged to guide or channel the temperature control fluid along a predetermined flow path through the temperature control chamber. Preferably, the at least one guide element is arranged such that it deflects or changes the direction of the temperature control fluid within the temperature control chamber. Overall, this advantageously enables direct temperature control of the battery cell, whereby the temperature control fluid can be guided through the cell housing of the battery cell or its temperature control chamber. By appropriately designing the temperature control chamber, targeted temperature control of the cell sides can also be advantageously ensured – in addition to or as an alternative to indirect cooling of the cell base by means of a temperature control plate. According to the invention, the cell housing is at least partially double-walled. For this purpose, it can have an inner wall and an outer wall, preferably spaced apart from the inner wall. The inner wall can, for example, surround an electrode stack or electrode winding and / or an electrolyte of the battery cell. The outer wall can surround the inner wall and / or be arranged offset to the outside at a predetermined distance from the inner wall. The temperature control chamber can be arranged between the inner wall and the outer wall. For example, the temperature control chamber can be bounded inwards by the inner wall and outwards by the outer wall. This advantageously provides a simple method for integrating the temperature control chamber into the battery cell. According to another aspect, the at least one guiding element can connect the inner wall and the outer wall, preferably directly. For example, the at least one guiding element can have a first end and a second end, preferably opposite the first end, wherein the first end can be connected to the inner wall and the second end to the outer wall. This advantageously stabilizes the cell casing. Alternatively, or in addition, the at least one guide element can be wedge-shaped. For example, the at least one guide element can have a tapered shape. Alternatively, or in addition, the at least one guiding element can have a first contact surface that rests against the inner wall. The at least one guiding element can thus be connected to the inner wall via this first contact surface. Furthermore, the at least one guiding element can have a second contact surface that rests against the outer wall. The at least one guiding element can thus be connected to the outer wall via this second contact surface. Preferably, the second contact surface is larger than the first. For example, the at least one guiding element can widen from the inner wall towards the outer wall. According to a further aspect of the invention, the at least one guide element can be deformable, preferably elastically deformable, by a deformation of the inner wall (e.g., caused by swelling of the battery cell). Preferably, the at least one guide element can thus be modified in shape (e.g., compressible and / or flattenable) by applying pressure, e.g., as a result of deformation or movement of the inner wall. Advantageously, this allows a change in the inner wall (e.g., due to swelling) without necessarily altering the outer dimensions of the battery cell. Furthermore or alternatively, according to the invention, the at least one guide element can be configured to decouple the outer wall from any deformation and / or movement of the inner wall that occurs when the inner wall is subjected to a load. Preferably, the outer wall should thus be as unaffected as possible by any movement and / or deformation of the inner wall. This can be achieved, by way of example, by a deformation of the at least one guide element (e.g., mediated by the inner wall). This advantageously allows for the provision of a battery cell that is as swelling-neutral as possible (with respect to its external dimensions). Furthermore, or alternatively, according to the invention, the at least one guiding element can be designed to interrupt and / or reduce the transmission of the load to the outer wall when the inner wall is subjected to a load. This advantageously ensures that the external dimensions of the battery cell are as unaffected as possible by potential changes (e.g., due to aging) in the electrode stack or electrode winding enclosed by the inner wall. According to another aspect, the inner and outer walls can each be frame-shaped (e.g., polygonal frames). For example, the inner and outer walls can each be essentially rectangular frames or form a closed, multi-sided (e.g., four-sided) frame. In one embodiment, the inner and outer walls can each be designed as hollow profiles and preferably arranged concentrically. This advantageously provides a temperature control chamber that is as simple to manufacture as possible. Alternatively, or in addition, the inner wall can be thinner than the outer wall. The inner wall can therefore have a smaller wall or material thickness than the outer wall. Advantageously, this allows the outer wall to provide sufficient protection against environmental influences and external stresses, while the inner wall can react to changes in the electrode stack or coil and / or the electrolyte (e.g., due to aging). According to another aspect, the cell housing can have a base plate and / or a lid plate. The base plate and the lid plate can be connected to each other via the inner wall. For example, the inner wall can extend between the base plate and the lid plate. Additionally, or alternatively, the base plate and the lid plate can also be connected to each other via the outer wall. For example, the outer wall can extend between the base plate and the lid plate. Preferably, the inner wall and the outer wall are arranged concentrically to each other. Accordingly, the base plate can cover the inner wall, which is preferably frame-shaped, and / or the outer wall, which is preferably frame-shaped, from below. Furthermore, the lid plate can cover the inner wall, which is preferably frame-shaped, and / or the outer wall, which is preferably frame-shaped, from above. According to another aspect, the at least one guide element can comprise at least one separating guide element. The at least one separating guide element can connect the base plate and the top plate (e.g., continuously). For example, the at least one separating guide element can be attached to both the base plate and the top plate, or extend (e.g., continuously) between the base plate and the top plate. Advantageously, this can provide a barrier for the temperature control fluid. In addition, or alternatively, the at least one guide element can comprise at least one base guide element. The at least one base guide element can be connected to the base plate (e.g., welded or bonded) and arranged at a distance from the cover plate. The at least one base guide element should therefore preferably not be directly connected to the cover plate. Preferably, the at least one base guide element is arranged at such a distance from the cover plate that a deflection (e.g., on the cover side), particularly preferably a 180° deflection, of the temperature control fluid is formed. For example, the at least one base guide element can be arranged oriented essentially perpendicular to a plane of extension of the cover plate. In addition, or alternatively, the at least one guide element can comprise at least one cover guide element. The at least one cover guide element can be connected to the cover plate (e.g., welded or bonded) and arranged at a distance from the base plate. The at least one cover guide element should therefore preferably not be directly connected to the base plate. Preferably, the at least one cover guide element is arranged at such a distance from the base plate that a deflection (e.g., on the base side), particularly preferably a 180° deflection, of the temperature control fluid is formed. For example, the at least one cover guide element can be arranged oriented essentially perpendicular to a plane of extension of the base plate. According to another aspect, at least one guide element can be rod-shaped. For example, at least one guide element can have a straight and / or elongated shape. Alternatively, or in addition, the at least one guide element can be a profile. For example, the at least one guide element can be a shaped body (e.g., rolled, drawn and / or pressed) whose cross-section is the same along its entire length. Alternatively, or in addition, the at least one guide element can be prismatic. Preferably, the at least one guide element has a triangular cross-section and / or a triangular base or top surface. Alternatively, or in addition, the at least one conductor element can have a longest extent along a vertical axis of the battery cell. For example, the at least one conductor element can have an extent along the vertical axis of the battery cell that is greater than a maximum extent perpendicular or radial to the vertical axis. According to another aspect, the cell housing can have at least one inlet (e.g., at the bottom). Preferably, the temperature control fluid can be supplied to the temperature control chamber via this at least one inlet. Furthermore, the cell housing can have at least one outlet (e.g., at the bottom). Preferably, the temperature control fluid can be discharged from the temperature control chamber via this at least one outlet. Here, the cell housing and the at least one guide element can form a flow guide, at least in sections, to direct the temperature control fluid from the at least one inlet to the at least one outlet in the temperature control chamber. For example, the cell housing and the at least one guide element can restrict the flow guide, at least in sections. This advantageously enables a controlled flow through the battery cell and / or the temperature control chamber. Another aspect is that the flow pattern can be U-shaped, at least in sections. For example, the flow pattern can have the shape of the letter "U" at least in sections. In addition, or alternatively, the flow pattern can change direction at least once. Preferably, the flow pattern changes direction by 180°. The temperature control fluid guided along the flow pattern can thus undergo a complete redirection. Alternatively, or in addition, the flow pattern can be meandering, at least in certain sections. This advantageously allows for the most homogeneous temperature distribution possible within the battery cell. According to another aspect, the at least one guide element can divide the temperature control chamber into several sections. Preferably, each of the several sections has its longest extent along a vertical axis of the battery cell. Furthermore, the several sections can be fluidically connected to one another, e.g., by the at least one guide element not completely separating adjacent sections. Alternatively, the several sections can also be fluidically separated from one another by the at least one guide element. Alternatively, or in addition, the at least one guide element can have multiple guide elements. Preferably, the multiple guide elements are all arranged in the same orientation, e.g., all oriented along the vertical axis of the battery cell. Furthermore, the multiple guide elements can be distributed around the circumference of the cell housing, for example. According to another aspect, the battery cell can have at least one through-hole for receiving a (e.g., elongated) fastening element (e.g., a screw). Preferably, the at least one through-hole extends through the temperature control chamber. The at least one through-hole can be surrounded by a corresponding wall. In one embodiment, the at least one through-hole has several (e.g., four) through-holes. The multiple through-holes can, for example, each be arranged in a corner region of the inner or outer wall. This advantageously enables secure mounting of the battery cell. Furthermore, the disclosure relates to an electrical energy storage device for a motor vehicle. The electrical energy storage device comprises at least one battery cell, as described in this document. Preferably, the at least one battery cell comprises several battery cells, which may, for example, be arranged in the form of a battery cell stack. Furthermore, the electrical energy storage device includes a temperature control device (e.g., a temperature control plate) for temperature control of the at least one battery cell. The temperature control device may have a fluid channel through which the temperature control fluid can flow and which is in fluid communication with the temperature control chamber. For example, the fluid channel of the temperature control device may be fluidically connected to the inlet and / or outlet. Accordingly, the temperature control fluid can be supplied to the at least one battery cell or its temperature control chamber via the temperature control device. Likewise, the temperature control fluid can be received by the temperature control device after it has flowed through the at least one battery cell or its temperature control chamber. In addition to supplying the at least one battery cell with temperature control fluid, the temperature control device may advantageously provide additional temperature control for the at least one battery cell, e.g.,on their underside, enable. According to one aspect, the at least one battery cell and the temperature control device can be connected to each other. For example, the at least one battery cell and the temperature control device can be screwed together. For this purpose, a suitable fastening element (e.g., a screw) can be inserted into the at least one through-hole of the at least one battery cell and screwed into a blind hole or a through-thread in the temperature control device. Ultimately, the present disclosure relates to a motor vehicle (e.g., a truck or a bus) comprising an electrical energy storage device and / or a battery cell as disclosed in this document. Preferably, the motor vehicle is a commercial vehicle, i.e., a motor vehicle specifically designed and equipped for transporting goods and / or towing one or more (e.g., agricultural) trailers. For example, the commercial vehicle could be a truck, a semi-trailer truck, a construction vehicle, and / or an agricultural machine (e.g., a tractor). The aspects and features of this disclosure described above can be combined in any way. Further details and advantages are described below with reference to the accompanying drawings. These show: Fig. 1 a schematic representation of an electrical energy storage device according to one embodiment; Fig. 2A a schematic representation of an electrical energy storage device according to another embodiment; Fig. 2B a schematic representation of a battery cell according to one embodiment; Fig. 3A a schematic representation of an electrical energy storage device according to another embodiment; Fig. 3B a schematic representation of a battery cell according to another embodiment; Fig. 4A a schematic representation of an electrical energy storage device according to another embodiment; and Fig. 4B a schematic representation of age-related changes in a battery cell according to another embodiment. The embodiments shown in the figures are at least partially identical, so that similar or identical parts are provided with the same reference numerals and, to avoid repetition, reference is also made to the description of the other embodiments or figures for their explanation. Figures 1, 2A, 3A, and 4A each show different views of an electrical energy storage device 20 for a motor vehicle (not shown separately). The electrical energy storage device 20 can provide electrical energy for at least one electric drive unit to power the motor vehicle. For example, the motor vehicle can be powered by a central electric drive, by several electric wheel hub drives, or by several wheel-mounted electric drives. The electrical energy storage device 20 can be designed as a high-voltage energy storage device. The high-voltage energy storage device can be operated, for example, with a DC voltage between 60 V and 1.5 kV, particularly preferably between 400 V and 850 V. The electrical energy storage device 20 can be charged externally via an electrical charging cable connected to a charging socket of the motor vehicle. The electrical energy storage device 20 comprises at least one battery cell 10. The at least one battery cell 10 can, for example, be a lithium-ion battery cell. The at least one battery cell 10 can comprise an electrolyte 1 and an electrode stack and / or electrode winding (not shown). Electrical energy can be stored in the at least one battery cell 10. The at least one battery cell 10 – which is also disclosed and usable independently of the features of the electrical energy storage device 20 – has a cell housing 12 (see also detailed illustrations 2B and 3B). The cell housing 12 can, for example, be prismatic or have a cuboid outer shape. The cell housing 12 can be made of plastic or metal, e.g., aluminum. The cell housing 12 preferably serves to protect the at least one battery cell 10 against environmental influences such as moisture and / or dirt. The cell housing 12 can have a length. This can, for example, denote a spatial extent along a longitudinal axis L of the cell housing 12 or of the at least one battery cell 10. The longitudinal axis L can run in the direction of the longest extent of the cell housing 12 or of the at least one battery cell 10. The cell housing 12 can also have a width. This can, for example, denote a spatial extent along a transverse axis Q of the cell housing 12 or of the at least one battery cell 10. The transverse axis Q can, for example, be oriented in the direction of the shortest extent of the cell housing 12 or of the at least one battery cell 10. For example, the longitudinal axis L and the transverse axis Q can each be oriented horizontally. Furthermore, the cell housing 12 or the at least one battery cell 10 can have a vertical axis H. This can preferably be perpendicular to the longitudinal axis L and the transverse axis Q.For example, the vertical axis H can be oriented vertically or parallel to the direction of gravity. The cell casing 12 can have a base plate 12c. The base plate 12c can be plate-shaped. The base plate 12c can, for example, have a flat and / or planar shape. For instance, the base plate 12c can be essentially cuboid. Furthermore, the cell housing 12 can have a cover plate 12d. The cover plate 12d can be plate-shaped. The cover plate 12d can, for example, have a flat and / or planar shape. For instance, the cover plate 12d can be essentially cuboid. The at least one battery cell 10 can also have contact terminals 2 (e.g., a positive terminal and a negative terminal). The contact terminals 2 can be arranged on the cover plate 12d. The cell housing 12 can further comprise a shell section connecting the base plate 12c and the cover plate 12d. Preferably, the shell section is frame-shaped (e.g., rectangular frame-shaped). For example, the shell section can be a (closed) hollow profile. The shell section can have a first end and a second end opposite the first end. The first end can be connected to the base plate 12c (e.g., welded). The second end can be connected to the cover plate 12d (e.g., pressed). The cell housing 12 can be double-walled, at least in sections. In principle, any area or component of the cell housing 12 can be double-walled; however, it is preferred that the casing section be double-walled. The cell housing 12, or the at least one battery cell 10, can have an inner wall 12a and an outer wall 12b. The outer wall 12b can define the outer boundaries of the cell housing 12. Accordingly, the outer wall 12b can face an external space or environment. The outer wall 12b can be coated with an electrically insulating film (e.g., a plastic film). In contrast, the inner wall 12a can face an interior space enclosed by the cell housing 12 for receiving the electrolyte 1 and / or the electrode stack or electrode winding. The inner wall 12a can, for example, be made of a thin, absorbent material.to limit the interior space for receiving the electrolyte 1 and / or the electrode stack or electrode coil. The inner and outer walls 12a, 12b should preferably be spaced apart from each other. For example, the outer wall 12b can be positioned further outwards than the inner wall 12a. The inner wall 12a and the outer wall 12b can each be substantially rectangular frames or form a closed, multi-sided (e.g., four-sided) frame. The inner wall 12a and the outer wall 12b can each have corner wall sections and substantially straight wall sections arranged between them. The inner wall 12a and the outer wall 12b can each be designed as a (closed) hollow profile (e.g., a rectangular hollow profile). The inner wall 12a and the outer wall 12b can be arranged concentrically to each other. For example, the inner wall 12a can be arranged concentrically within the outer wall 12b. Furthermore, the outer wall 12b can be thicker than the inner wall 12a. The inner wall 12a can connect the base plate 12c and the cover plate 12d. For example, the inner wall 12a can be connected to the base plate 12c at one end and to the cover plate 12d at the opposite end. The outer wall 12b can connect the base plate 12c and the cover plate 12d. For example, the outer wall 12b can be connected to the base plate 12c at one end and to the cover plate 12d at the opposite end. Accordingly, the base plate 12c can cover the inner wall 12a and / or the outer wall 12b from below. Furthermore, the cover plate 12d can cover the inner wall 12a and / or the outer wall 12b from above. The at least one battery cell 10 further comprises a temperature control chamber 14 for the flow of a temperature control fluid. The temperature control chamber 14 can provide a defined volume for the flow of the temperature control fluid. Preferably, the temperature control fluid 14 is a liquid, e.g., cooling water. The temperature control chamber 14 is also formed at least partially by the cell housing 12. For example, the temperature control chamber 14 can be formed by a (deliberately provided) free space or cavity in the cell housing 12, e.g., between the inner wall 12a and the outer wall 12b. Accordingly, the temperature control chamber 14 can be arranged between the inner wall 12a and the outer wall 12b or be bounded at least partially by the inner wall 12a and the outer wall 12b. The temperature control chamber 14 can be annular or frame-shaped. The temperature control chamber 14 can have a closed cross-section perpendicular to the vertical axis H, orThe temperature control chamber 14 is designed to be circumferential. Preferably, it extends along several (e.g., four) side surfaces of the at least one battery cell 10 or its cell housing 12. The cell housing 12 can further have at least one inlet 12e through which the temperature control fluid can be supplied to the temperature control chamber 14. Preferably, the inlet 12e is arranged on the base plate 12c. For example, the base plate 12c can have a passage that opens into the temperature control chamber 14. Furthermore, the cell housing 12 can have at least one drain 12f through which the temperature control fluid can be discharged from the temperature control chamber 14. Preferably, the drain 12f is also arranged on the base plate 12c. For example, the base plate 12c can have a further passage through which the temperature control chamber 14 is connected or can be connected to the outside. The at least one battery cell 10 also has at least one guide element 16, which is arranged in the temperature control chamber 14 for directing the temperature control fluid in the temperature control chamber 14. The at least one guide element 16 preferably serves to (selectively) influence the flow of the temperature control fluid in the temperature control chamber 14 and / or to guide the temperature control fluid through the temperature control chamber 14. The at least one guide element 16 can be substantially rod-shaped. For example, the at least one guide element 16 can have a straight and / or elongated shape. Preferably, the at least one guide element 16 has its longest extent along the vertical axis H of the at least one battery cell 10 or its cell housing 12. The at least one guide element 16 can thus be oriented along the vertical axis H or perpendicular to a plane of extension of the base plate 12c and / or the cover plate 12d. The at least one guide element 16 can be, for example, B. a profile (e.g.a solid profile). The at least one guide element 16 can be extruded and / or pressed. The at least one guide element 16 can be made of plastic and / or metal. The at least one guide element 16 can be arranged between the inner wall 12a and the outer wall 12b (see Fig. 1, Fig. 2B, Fig. 3B and Fig. 4B). The at least one guide element 16 can connect the inner wall 12a and the outer wall 12b (e.g., in a web-like manner). For example, the at least one guide element 16 can have a first end and a second end, preferably opposite the first end, wherein the first end can be connected to the inner wall 12a and the second end to the outer wall 12b. The at least one guide element 16 can have a first contact surface 16a that abuts the inner wall 12a. Furthermore, the at least one guide element 16 can have a second contact surface 16b that abuts the outer wall 12b. Preferably, the second contact surface 16b is larger than the first contact surface 16a.For example, the at least one guide element 16 can widen from the inner wall 12a to the outer wall 12b. The at least one guide element 16 can thus be wedge-shaped, for example. For example, the at least one guide element 16 can have a shape that tapers to a point towards the inner wall 12a. Preferably, the at least one guide element 16 has a triangular cross-section and / or a triangular base or top surface. The at least one guide element 16 can also be prismatic. The at least one guide element 16 can be a component separate from the inner or outer wall 12a, 12b. However, the at least one guide element 16 can also be integrally formed with the inner wall 12a and / or outer wall 12b or be integrally connected to the inner wall 12a and / or outer wall 12b. The at least one guide element 16 can be deformable by a deformation of the inner wall 12a (e.g., caused by swelling of the electrode stack or electrode winding received in the inner wall 12a) (see Fig. 4B). Preferably, the at least one guide element 16 is elastically deformable. For example, the at least one guide element 16 can be compressible and / or compressible by a deformation of the inner wall 12a perpendicular to the vertical axis H. The deformation of the inner wall 12a can be caused by, for example, a change in the shape of the inner wall 12a. B. a bulge of the inner wall 12a, e.g. along the transverse axis Q.The at least one guide element 16 can thus be configured to decouple the outer wall 12b from any deformation and / or movement of the inner wall 12a that occurs when the inner wall 12a is subjected to a load. The at least one guide element 16 can be configured to interrupt and / or reduce the transmission of the load to the outer wall 12b when the inner wall 12a is subjected to a load. As shown in Fig. 4B, this ensures that the outer wall 12b, or the external dimensions of the at least one battery cell 10, are as unaffected as possible by any movement and / or deformation of the inner wall 12a. In Fig. 4B, the situation at the beginning of the life cycle of the at least one battery cell 10 is shown on the left, while the situation at the end of the life cycle of the at least one battery cell 10 is shown on the right. Furthermore, the cell housing 12 and the at least one guide element 16 can form, at least partially, a flow guide 18 for guiding the temperature control fluid from the at least one inlet 12e to the at least one outlet 12f in the temperature control chamber 14. As shown in Fig. 2A or Fig. 3A, the flow guide 18 can be U-shaped, at least partially. For example, the flow guide 18 can have two sections oriented along the vertical axis H, which are connected by a connecting section oriented transversely to the vertical axis H. The at least one battery cell 10 or the at least one guide element 16 can comprise at least one bottom guide element 16.2, which is connected to the base plate 12c and spaced apart from the cover plate 12d. Preferably, the at least one bottom guide element 16.2 is spaced from the cover plate 16d in such a way that a deflection, particularly preferably a 180° deflection, of the temperature control fluid is formed (on the cover side). Accordingly, the temperature control fluid guided along the flow guide 18 can undergo a change of direction, in particular a complete deflection. Furthermore, the at least one battery cell 10 or the at least one conductive element 16 can comprise at least one separating conductive element 16.1, which connects the base plate 12c and the cover plate 12d (e.g., continuously). Accordingly, the at least one separating conductive element 16.1 can form a barrier for the temperature control fluid within the temperature control chamber 14. As shown in Fig. 3A, the at least one battery cell 10 or the at least one guide element 16 can also comprise at least one cover guide element 16.3, which is connected to the cover plate 12d and spaced apart from the base plate 12c. Preferably, the at least one cover guide element 16.3 is spaced apart from the base plate 12c such that a deflection, particularly preferably a 180° deflection, of the temperature control fluid is formed (on the bottom side). Accordingly, the temperature control fluid guided along the flow guide 18 can undergo a change of direction, in particular a complete deflection. The at least one guide element 16 can also comprise several guide elements 16. Preferably, the several guide elements 16 have one or more bottom guide elements 16.2, one or more separating guide elements 16.1, and / or one or more cover guide elements 16.3. The several guide elements 16 can be arranged circumferentially distributed around the cell housing 12. Preferably, the several guide elements 16 are all oriented in the same way, e.g., all along the vertical axis H of the at least one battery cell 10 or its cell housing 12. This allows the temperature control chamber 14 to be divided into several sections. Two adjacent sections can be fluidically connected to each other, e.g., two sections separated from each other by a bottom guide element 16.2 and / or a cover guide element 16.3. However, two adjacent sections can also be fluidically separated from each other, e.g., two by a separating guide element 16.1 separate sections. Preferably, each of the multiple sections has its longest extent along a vertical axis H of the at least one battery cell 10 or its cell housing 12. In the case of multiple guide elements 16, the flow guidance 18 can furthermore be designed to be meandering, at least in sections. For example, a bottom guide element 16.2 and a top guide element 16.3 can be arranged next to each other at a distance. Furthermore, the cell housing 12 can have a flange plate 12g. The flange plate 12g can be plate-shaped. The flange plate 12g can, for example, have a flat and / or planar shape. For instance, the flange plate 12g can be essentially cuboid. The flange plate 12g can be connected to the cover plate 12d. For example, the flange plate 12g can be arranged above the cover plate 12d or cover the cover plate 12d. The flange plate 12g can also have openings. One of the contact poles 2 can extend through each of the openings or be led outwards. The flange plate 12g can also project laterally beyond the cover plate 12d. Furthermore, the at least one battery cell 10 can have at least one through-hole 11 for receiving a (e.g., elongated) fastening element 13 (e.g., a screw). Preferably, the at least one through-hole 11 extends through the base plate 12c, the temperature control chamber 14, the cover plate 12d, and / or the flange plate 12g. In one embodiment, the at least one through-hole 11 has several (e.g., four) through-holes 11. The several through-holes 11 can, for example, be arranged in the area of ​​the corner wall regions of the inner wall 12a and / or the outer wall 12b. In addition to the at least one battery cell 10 described above, the electrical energy storage device 20 has a temperature control device 21 for maintaining the temperature of the at least one battery cell 10. Preferably, the temperature control device 21 is a temperature control plate. Accordingly, the temperature control device 21 or the temperature control plate can be plate-shaped. The temperature control device 21 or the temperature control plate can, for example, have a flat and / or planar shape. For instance, the temperature control device 21 or the temperature control plate can be substantially cuboidal. The temperature control device 21 and the at least one battery cell 10 can be connected to each other. For example, the at least one battery cell 10 and the temperature control device 21 can be screwed together. For this purpose, the electrical energy storage device 20 can have a corresponding fastening element 13 (e.g., a screw) that can be received in the at least one through-hole 11 of the at least one battery cell 10 and can, for example, be screwed into a blind hole or a through-thread in the temperature control device 21. The temperature control device 21 and the at least one battery cell 10 can be in direct contact with each other. Alternatively, a gap filler 23 (e.g., a gasket and / or a gap pad) can also be arranged between the temperature control device 21 and the at least one battery cell 10. The at least one battery cell 10 can be arranged upright on the temperature control device 21.Preferably, the base plate 12c of the at least one battery cell 10 is arranged adjacent to or near the temperature control device 21. The temperature control device 21 can support or carry the at least one battery cell 10. The temperature control device 21 further comprises a fluid channel 22. This channel can be permeated by the temperature control fluid. Accordingly, the fluid channel 22 and the temperature control chamber 14 can be fluidically connected. For example, the fluid channel 22 of the temperature control device 21 can be fluidically connected to the inlet 12e and / or the outlet 12f. The temperature control fluid can thus be supplied to the at least one battery cell 10 or its temperature control chamber 14 via the temperature control device 21. Likewise, the temperature control fluid, after flowing through the at least one battery cell 10 or its temperature control chamber 14, can be received by the temperature control device 21. The temperature control device 21 and the at least one battery cell 10 can therefore be permeated by the same temperature control fluid. The at least one battery cell 10 can further comprise several battery cells 10. The several battery cells 10 can each be identical in design. The several battery cells 10 can be arranged in a single layer. Preferably, the several battery cells 10 are all oriented in the same way. For example, the cover plates 12d of the several battery cells 10 can each be oriented upwards. Within the layer, the several battery cells 10 can be arranged in the form of a battery cell stack or several battery cell stacks. Within a battery cell stack, the battery cells 10 can be stacked side by side or one behind the other along a stacking direction. The stacking direction can, for example, be horizontally oriented. Furthermore, it is possible that a compensating element (e.g., a gap pad) is arranged between each pair of battery cells 10 to bridge a gap between the battery cells 10 of a battery cell stack. The multiple battery cells 10, or their respective temperature control chambers 14, can each be fluidically connected to the temperature control device 21, or its fluid channel 22. The fluid channel 22 can be arranged below the multiple battery cells 10. Preferably, the fluid channel 22 runs along the stacking direction (see Fig. 1A, Fig. 2A, Fig. 3A, or Fig. 4A). The fluid channel 22 can have several, preferably parallel, sections. The sections can be separated from each other by partitions in the temperature control device 21. At least one of the several sections can be a supply line. The supply line can be fluidically connected to the respective inlets 12e of the battery cells 10. At least one of the several sections can be a return line. The return line can be fluidically connected to the respective outlets 12f of the battery cells 10. Although the invention has been described with reference to specific embodiments, it is apparent to a person skilled in the art that various modifications can be made and equivalents can be used as substitutes without departing from the scope of the invention. Consequently, the invention is not intended to be limited to the disclosed embodiments, but rather to encompass all embodiments falling within the scope of the appended claims. In particular, the invention also claims protection for the subject matter and features of the dependent claims independently of the referenced claims. Reference symbol list 1 Electrolyte 2 Contact pole 10 Battery cell 11 Through hole 12 Cell housing 12a Inner wall 12b Outer wall 12c Base plate 12d Cover plate 12e Inlet 12f Outlet 12g Flange plate 13 Fastening element 14 Temperature control chamber 16 Guide element 16.1 Separating guide element 16.2 Base guide element 16.3 Cover guide element 16a First contact surface 16b Second contact surface 18 Flow guide 20 Electrical energy storage 21 Temperature control device 22 Fluid channel 23 Gap filler H Vertical axis L Longitudinal axis Q Transverse axis

Claims

Battery cell (10) for an electrical energy storage device (20) for a motor vehicle, comprising: a cell housing (12); a temperature control chamber (14) for flow with a temperature control fluid, wherein the temperature control chamber (14) is formed at least partially by the cell housing (12); and at least one guide element (16) arranged in the temperature control chamber (14) for directing the temperature control fluid in the temperature control chamber (14), wherein: the cell housing (12) is formed at least partially as a double wall, comprising an inner wall (12a) and an outer wall (12b) spaced apart from the inner wall (12a); and the temperature control chamber (14) is arranged between the inner wall (12a) and the outer wall (12b), wherein the at least one guide element (16): a) is deformable by deformation of the inner wall (12a);and / or b) is designed to decouple the outer wall (12b) from any deformation and / or movement of the inner wall (12a) that occurs when the inner wall (12a) is subjected to a load; and / or c) is designed to interrupt and / or reduce the transmission of the load to the outer wall (12b) when the inner wall (12a) is subjected to a load. Battery cell (10) according to claim 1, wherein the at least one guide element (16): a) connects the inner wall (12a) and the outer wall (12b); and / or b) is wedge-shaped; and / or c) has a first contact surface (16a) that abuts the inner wall (12a) and a second contact surface (16b) that abuts the outer wall (12b), wherein the second contact surface (16b) is larger than the first contact surface (16a). Battery cell (10) according to claim 1 or 2, wherein: the inner wall (12a) and the outer wall (12b) are frame-shaped; and / or the inner wall (12a) is thinner than the outer wall (12b). Battery cell (10) according to one of the preceding claims, wherein: the cell housing (12) further comprises a base plate (12c) and a cover plate (12d), wherein the base plate (12c) and the cover plate (12d) are connected to each other via the inner wall (12a) and the outer wall (12b). Battery cell (10) according to claim 4, wherein the at least one guide element (16) comprises: at least one separating guide element (16.1) connecting the base plate (12c) and the cover plate (12d); and / or at least one base guide element (16.2) connected to the base plate (12c) and spaced apart from the cover plate (12d); and / or at least one cover guide element (16.3) connected to the cover plate (12d) and spaced apart from the base plate (12c). Battery cell (10) according to one of the preceding claims, wherein the at least one guide element (16): a) is rod-shaped; and / or b) is a profile; and / or c) is prismatic; and / or d) has a longest extent along a vertical axis (H) of the battery cell (10). Battery cell (10) according to one of the preceding claims, wherein: the cell housing (12) has at least one inlet (12e); the cell housing (12) has at least one outlet (12f); and a flow guide (18) for guiding the temperature control fluid from the at least one inlet (12e) to the at least one outlet (12f) in the temperature control chamber (14) is formed at least sectionally through the cell housing (12) and the at least one guide element (16). Battery cell (10) according to claim 7, wherein the flow guide (18): a) is at least partially U-shaped; and / or b) changes its direction at least once; and / or c) is at least partially meandering. Battery cell (10) according to one of the preceding claims, wherein: the at least one guide element (16) divides the temperature control chamber (14) into several sections; and / or the at least one guide element (16) comprises several guide elements (16). Battery cell (10) according to one of the preceding claims, further comprising: at least one through hole (11) for receiving a fastening element (13). Electrical energy storage device (20) for a motor vehicle, comprising: at least one battery cell (10) according to one of the preceding claims; and a temperature control device (21) for temperature control of the at least one battery cell (10), wherein the temperature control device (21) has a fluid channel (22) through which the temperature control fluid flows and which is in fluid communication with the temperature control chamber (14). Electrical energy storage device (20) according to claim 11, wherein: the at least one battery cell (10) and the temperature control device (21) are connected to each other. motor vehicle comprising: an electrical energy storage device (20) according to claim 11 or 12 and / or a battery cell (10) according to any one of claims 1 to 10.

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