Electrical energy storage device for a motor vehicle and motor vehicle

Abstract

Electrical energy storage device (1) for storing electrical energy for a motor vehicle, comprising a plurality of storage cells (2) designed to store the electrical energy, each of which has a cell housing (4) defining a receiving space (5) and a conducting element (7) through which a temperature control medium can flow and which penetrates the receiving space (5), and comprising a contacting device (9) designed separately from the storage cells (2), via which the storage cells (2) are electrically connected to one another, characterized in that: - the contacting device (9) has domes (10, 11) through which the temperature control medium can flow and which are inserted into the line elements (7), via which the temperature control medium can be introduced into the line elements (7) and / or discharged from the line elements (7), and - the storage cells (2) are held on a cell holder (12) which is formed separately from the storage cells (2) and separately from the contacting device (9) and at least limits relative movements between the storage cells (2), by means of which the domes (10, 11) are held in the line elements (7).

Description

[0001] The invention relates to an electrical energy storage device for a motor vehicle according to the preamble of patent claim 1 or 16. Furthermore, the invention relates to a motor vehicle with at least one such energy storage device.

[0002] A battery system for an electric vehicle is known from US 2019 / 0 393 571 A1. Furthermore, DE 102 02 807 A1 discloses a device for regulating the temperature of high-performance secondary batteries for vehicle applications. Furthermore, DE 10 2018 213 637 A1 discloses a cooling lance for cooling an electrically conductive contact body.

[0003] US 10 003 112 B1 shows a battery pack comprising, for use with a supply of heat transfer fluid, a plurality of battery modules arranged in one or more rows, and an elongated backplane positioned between the rows or adjacent to a row. The backplane has outer longitudinal surfaces and includes a plurality of busbar assemblies, the number of which corresponds to the number of battery modules and which are connected to the outer longitudinal surfaces. The elongated backplane defines internal conduits configured to receive heat transfer fluid from the supply and extend along a length of the backplane adjacent to the busbar assemblies. End plates of the battery modules have negative and positive voltage terminals that mate with corresponding electrical terminals of a respective one of the busbar assemblies.An electrical connection between each busbar assembly and the corresponding voltage terminals is made via a push-to-connect operation, with the positive terminal covered by a touch-safe barrier.

[0004] DE 10 2016 009 910 A1 relates to a battery device with a tubular housing which surrounds a battery cell space in which at least one battery cell or at least one battery cell coil is accommodated or at least receivable, wherein the housing has an outer casing and axially opposite end faces, on each of which at least one electrical contact is arranged, and wherein a cooling line is guided through the battery cell space and through the housing surfaces, wherein opposite regions of the housing have a mechanical plug-in connection element of the housing, opposite regions of the housing have an electrical plug-in connection element of the at least one electrical contact, and opposite regions of the housing have a fluidic plug-in connection element of the cooling line, in particular by means of which identically constructed battery devices can be arranged in series in at least one direction to form a unit.

[0005] In DE 10 2008 009 041 A1, the assembly comprises several prefabricated battery cells that are sealed to the outside by a cell housing, with the battery cells arranged in rows. The housing comprises walls that engage opposite outer regions of a periphery of the battery cells. The walls are deformed relative to one another in the radial direction of the battery cells by a holding unit in order to radially clamp the battery cells. Each wall of the battery cell comprises a half-shell-shaped clamping section. The clamping sections rest against axial end sections of the battery cells.

[0006] WO 2022 / 063632 A1 relates to an energy storage cell in the form of a cylindrical round cell with an outer diameter of at least 30 mm, comprising an electrode-separator assembly in the following sequence: anode, separator, cathode. The electrode-separator assembly has the shape of a hollow cylindrical winding with two terminal end faces and a winding sheath located between them. The energy storage cell comprises a housing surrounding a hollow cylindrical interior. Inside the housing, the electrode-separator assembly is axially aligned in the form of a winding.To define the interior, the housing comprises: - a first annular closure element having an outer diameter and an inner diameter; - a second annular closure element having an outer diameter and an inner diameter; - a first tubular housing part having two end circular openings, the diameter of the first tubular housing part being matched to the outer diameter of the first annular closure element and the second annular closure element; and - a second tubular housing part having two end circular openings, the diameter of the second tubular housing part being matched to the inner diameter of the first annular closure element and the second annular closure element.The strip-shaped electrodes of the electrode-separator assembly are contacted via the longitudinal edges of the electrodes, which protrude from the end faces of the hollow cylindrical coil. The energy storage cell comprises an at least partially metallic contact element that is in direct contact with one of the longitudinal edges and is preferably connected to it by welding. The first or second annular closure element acts as the contact element. The second tubular housing part of the housing defines a channel that is open at both ends and runs axially through the energy storage cell.

[0007] WO 2019 / 043413 A1 provides a support element for a plurality of cylindrical battery cells. The support element has a generally channel-shaped configuration and comprises a base and two upright walls disposed at opposite edges of the base. The walls extend generally perpendicular to the base. The base is provided with a plurality of open-bottomed recesses, each configured to receive a single cylindrical battery cell. Each well is provided with first and second elastic alignment means arranged to bias a cell located in a well in mutually perpendicular directions.

[0008] EP 2 461 394 B1 discloses a storage device comprising a set of electrical energy storage cells, i.e., front cells, and a flange, e.g., front flange or rear flange, with a set of holding elements, each element cooperating with one of the cells to hold the cell in a fixed position relative to other cells. Each cell is separated from other cells by a distance greater than the specified threshold. Conductive elements electrically connect each electrical pole of one of the cells to a positive pole or a negative pole and / or to an electrical pole of the latter cell. An independent claim is also included for a method of manufacturing an electrical energy storage device for vehicles.

[0009] DE 11 2012 007 185 B4 shows an electrical storage device having a plurality of electrical storage elements, each of the elements extending in a predetermined direction and having a positive electrode terminal and a negative electrode terminal at both ends in the predetermined direction, the elements being aligned in a plane perpendicular to the predetermined direction.Furthermore, the electric storage device has a bus bar that electrically connects the plurality of electric storage elements; and has a housing in which the plurality of electric storage elements are accommodated, wherein the housing has an opening portion configured to allow a heat exchange medium for adjusting a temperature of the electric storage element to pass therethrough and extends in the predetermined direction, and a portion of the bus bar extends in the predetermined direction and is arranged along a wall surface of the housing in which the opening portion is formed, the portion being arranged at a position different from a position of the opening portion.

[0010] DE 10 2020 004 357 A1 relates to a contacting device for an electric accumulator, which comprises a plurality of accumulator cells, each having a positive pole and a negative pole, with a first busbar for contacting the positive poles and with a second busbar for contacting the negative poles, as well as with a heat transfer body through which a cooling fluid can flow and which can be thermally coupled to the positive poles and the negative poles for controlling the temperature of the accumulator cells. According to the invention, the busbars have at least one channel element through which the cooling fluid can flow, and the heat transfer body is formed at least partially by the busbars. Furthermore, the invention relates to an accumulator arrangement with an electric accumulator and a contacting device.

[0011] DE 10 2007 010 750 B3 shows a single electrochemical cell comprising an electrode stack wound around and unfolded on a cooling tube. The cooling tube, in cross-section, is made of a thermally conductive material on its surface facing the electrode stack. The cooling tube is designed as a thermally conductive rod, and the thermally conductive rod is a solid material made of a thermally conductive metallic material. The material of the thermally conductive rail is aluminum and copper.

[0012] The object of the present invention is to provide an electrical energy storage device for a motor vehicle and a motor vehicle with such an electrical energy storage device, so that a particularly advantageous temperature control can be realized in a particularly space-saving and cost-effective manner.

[0013] This object is achieved according to the invention by an electrical energy storage device having the features of patent claim 1, by a motor vehicle having the features of patent claim 15, and by an electrical energy storage device having the features of patent claim 16. Advantageous embodiments of the invention are the subject of the dependent claims.

[0014] A first aspect of the invention relates to an electrical energy storage device, also simply referred to as a storage device, for storing, in particular electrochemically, electrical energy or electrical current for a motor vehicle.

[0015] The electrical energy store is preferably designed as a battery, in particular as a secondary battery, so that the electrical energy can be or is stored electrochemically by means of the energy store. The motor vehicle, preferably designed as a motor vehicle, in particular as a passenger car, has the electrical energy store in its fully manufactured state. The electrical energy store is preferably designed as a high-voltage component whose electrical voltage, in particular electrical operating or nominal voltage, is preferably greater than 50 volts, in particular greater than 60 volts, and very preferably amounts to several hundred volts. This makes it possible, for example, to achieve particularly high electrical outputs for electrically, in particular purely electrically, driving the motor vehicle.The motor vehicle is preferably designed as a hybrid or electric vehicle, in particular as a battery-electric vehicle (BEV). Thus, in its fully manufactured state, the motor vehicle has, for example, at least one electric machine by means of which the motor vehicle can be driven electrically, in particular purely electrically. For this purpose, the electric machine is supplied with the electrical energy stored in the electrical energy storage device. The electric machine is preferably a high-voltage component whose electrical voltage, in particular electrical operating or nominal voltage, is preferably greater than 50 volts, in particular greater than 60 volts, and very preferably amounts to several hundred volts.

[0016] The energy storage device has a plurality of storage cells in or by means of which the electrical energy is to be stored or is stored, in particular electrochemically. The storage cells are also referred to as cells and are individual cells, thus components formed separately from one another. In particular, the respective storage cell is a battery cell, thus a secondary cell. In other words, it is preferably provided that the respective storage cell is designed as an accumulator or as an accumulator cell. For example, the respective storage cell has two end sides which are spaced apart from one another, in particular along a spacing direction, which end sides are also referred to as end faces or are formed by end faces.In particular, the spacing direction coincides with a longitudinal extension direction of the respective memory cell, which extends, for example, at least substantially elongately along its respective longitudinal extension direction and thus has an elongate extension, hence a longitudinal extension, along the respective longitudinal extension direction.

[0017] The respective storage cell has a respective cell housing, which delimits, in particular directly, a respective receiving space of the respective storage cell. In particular, the receiving space is partially and, for example, directly delimited by the end faces. For example, the respective cell housing has a respective cell shell, also referred to as a housing shell, which is arranged at least along the spacing direction between the end faces and partially, in particular directly, delimits the receiving space. The storage cell could fundamentally be designed as a round cell, so that the respective storage cell can, for example, be cylindrical on the outer circumference, thus having the shape of a particularly right circular cylinder.However, the preceding and following statements are also readily applicable to storage cells which have a shape other than cylindrical on the outer circumference and are, for example, prismatic or have a shape different therefrom. In particular, a respective storage device of the respective storage cell is accommodated in the receiving space. The electrical energy can be stored, in particular electrochemically, by means of the respective storage device. For example, the respective storage device comprises at least one electrode. In particular, the respective storage device can have at least or exactly two electrodes.In particular, a first of the electrodes has a first electrical polarity, while a second of the electrodes has a second electrical polarity, wherein the second electrical polarity is a different electrical polarity from the first electrical polarity, in particular wherein the electrical polarities are opposite to one another. Thus, for example, one of the electrodes is a cathode, while the other electrode can be an anode. Alternatively or additionally, the respective storage device can have a respective, in particular liquid, electrolyte, wherein the respective electrode can be in, in particular direct, contact with the electrolyte.

[0018] Each storage cell further comprises a respective conduit element which penetrates the receiving space and, for example, also the end faces or end surfaces. A temperature control medium, for example a liquid, can flow through the conduit element, by means of which the respective storage cell can be temperature-controlled, i.e. cooled and / or heated. Since the conduit element penetrates the receiving space and, for example, also the end faces or end surfaces, it is conceivable for the conduit element itself, i.e. considered on its own, to open at both ends, i.e. at the respective two ends, into a respective environment of the respective storage cell. Thus, for example, the temperature control medium can be introduced into the conduit element from outside the storage cell and then flow through the conduit element, in particular at a first of the ends.At the second end, for example, the temperature control medium can be discharged from the line element and led to the environment of the storage cell, for example. The respective storage cell has, for example, two connection elements, also referred to as terminals, which are also referred to as electrode connections. The electrode connections are, for example, respective contact areas. The respective storage cell can provide the electrical energy stored in the respective storage cell via the electrode connections, i.e. via the contact areas. In addition, the respective storage cell can be supplied with electrical energy via its electrode connections, i.e. via its contact areas, which can thus be stored in the respective storage cell. For example, the contact areas are arranged on the same end face, i.e. on a first of the end faces or on the second end face.The end faces face away from one another along the spacing direction. One of the electrode connections, and therefore one of the contact regions, is, for example, an electrical positive pole of the respective storage cell and is therefore also referred to as the cathode. The other electrode connection, and therefore the other contact region, is, for example, a respective negative pole of the respective storage cell and is therefore also referred to as the anode. This means that one electrode connection can be the electrical positive pole and the other electrode connection can be the electrical negative pole of the respective storage cell. The conduction element is, for example, formed separately from at least one of the end faces or separately from both end faces and is connected to the at least one end face, in particular to the two end faces.

[0019] Furthermore, the electrical energy storage device has a contacting device formed separately from the storage cells and separately from the conducting elements, via which the storage cells are electrically connected to one another. As a result, the storage cells are connected, for example, in series or parallel. In particular, the contacting device can be electrically contacted to the respective connection elements of the respective storage cell, whereby the storage cells can be electrically connected to one another, in particular such that the storage cells are connected or electrically connected to one another in parallel, i.e., in a parallel circuit, or in series, i.e., in a series circuit. The contacting device is also referred to as a contacting system or contact system.

[0020] In order to be able to realize particularly advantageous temperature control, i.e., cooling and / or heating, of the storage cells in a particularly space-saving and cost-effective manner, the invention provides that the contacting device has domes through which the temperature control fluid can flow and which are inserted into the line elements, via which the preferably liquid temperature control medium can be introduced into the line elements and / or discharged from the line elements. The contacting device thus has at least a dual function. On the one hand, the contacting device is used to electrically connect the storage cells to one another via or by means of the contacting device.Secondly, the contacting device is also used to guide the temperature control medium, which is preferably in the form of a fluid, i.e., to conduct it and thereby introduce it into the line elements and / or discharge it from the line elements, i.e., to discharge it from the line elements. Thus, the contacting device is also used to supply the line elements with the temperature control medium via the domes and / or to discharge or discharge the temperature control medium from or from the line elements via the domes. Preferably, the contacting device is formed from an electrically conductive material, in particular from an electrically conductive metallic material, so that the storage cells can be electrically connected to one another via the contacting device.In this regard, it has proven particularly advantageous to use an electrically non-conductive tempering medium, so that the tempering medium is preferably designed as a non-conductor. A non-conductor is understood in particular to be a material whose electrical conductivity is less than 10. -8 S*cm -1 or a specific resistance of over 10 8 Ω*cm. This helps prevent unwanted short circuits.

[0021] The respective dome is a respective, in particular elongated, projection through which the temperature control medium can flow. Thus, for example, the temperature control medium flowing through the respective dome can flow from the dome into the line element, and thus flow out of the respective dome and flow into the line element. Furthermore, it is conceivable that the temperature control medium flowing through the respective line element can flow out of the line element and into the respective dome and can subsequently be discharged from the line element by means of the respective dome. For example, first of the domes penetrate the respective first end faces of the storage cells, and for example, second of the domes penetrate the respective second end faces of the respective storage cells.

[0022] According to the invention, the electrical energy store further comprises a cell holder which is formed separately from the storage cells and separately from the contacting device and is also simply referred to as a holder. The storage cells are held, in particular directly, on the cell holder, as a result of which relative movements between the storage cells are at least limited, in particular prevented. In other words, it is provided that the cell holder at least limits, in particular prevents, relative movements between the storage cells. In particular, the storage cells are held to one another or together via the cell holder. This is to be understood in particular that the storage cells are held relative to one another by means of the cell holder in a pattern predetermined by the cell holder.Furthermore, it is particularly preferably provided that the storage cells, in particular in pairs, are held at a respective distance from one another by means of the cell holder, so that it is preferably provided that the storage cells do not touch one another. For example, the contacting device is held, in particular directly, on the cell holder. By means of the cell holder, the domes are held in the conduction elements, in particular relative to the storage cells, and are thus secured. In other words, it is further provided that the cell holder at least limits, in particular prevents, relative movements between the domes and the conduction elements. The cell holder therefore also has a dual function. On the one hand, the cell holder is used to hold the storage cells together, i.e. to at least limit, in particular prevent, relative movements between the storage cells.Secondly, the cell holder is used to secure the domes in the conduction elements, thus at least limiting, and in particular preventing, relative movements between the domes and the storage cells or the conduction elements. Since the contacting device, the cell holder, and the storage cells are designed separately from one another, the electrical energy storage device can be manufactured particularly easily and thus quickly and cost-effectively. For this purpose, for example, the domes are inserted into the conduction elements, and the storage cells are held on the cell holder, which is particularly associated with the cell holder also securing the domes in the conduction elements. This allows for a particularly simple and compact design of the electrical energy storage device, as well as a time- and cost-effective production option.By using the line elements, the storage cells can be cooled particularly effectively and efficiently, in particular in the manner or principle of inversion cooling, without, however, actually implementing such inversion cooling and thus having to accept the disadvantages of such inversion cooling. Inversion cooling means that during operation of the electrical energy storage device, the temperature control medium, which is for example liquid and preferably electrically non-conductive, flows directly onto and around the storage cells. This can ensure advantageous heat exchange between the temperature control medium and the storage cells. Disadvantages of such inversion cooling, however, can include unwanted leaks and unwanted corrosion effects, which can now be avoided by specifically guiding the temperature control medium using the line elements.A particularly advantageous heat exchange between the temperature control medium and the respective storage cell can be ensured via the conduit element. If, for example, the temperature control medium has a higher temperature than the respective storage cell while flowing through the conduit element, heat can be transferred from the temperature control medium to the respective storage cell via the respective conduit element, whereby the respective storage cell can be heated and / or kept warm. If, for example, the temperature control medium has a lower temperature than the respective storage cell while flowing through the respective conduit element, heat can be transferred from the respective storage cell to the temperature control medium via the respective conduit element, whereby the respective storage cell is cooled.In particular, it is conceivable for the conducting element to penetrate or pass through the respective storage device, thereby ensuring particularly effective and efficient temperature control of the respective storage cell. Undesired leaks and corrosion effects can advantageously be avoided with the electrical energy storage device according to the invention. The electrical energy storage device, designed, for example, as a high-voltage battery (HV battery), can be made significantly more compact and slimmer than conventional solutions. Furthermore, the material used to manufacture the electrical energy storage device can be kept low. The number of parts, the costs, and the installation space required for the electrical energy storage device can be kept particularly small. The contacting device enables space-saving contacting of the storage cells as well as effective and efficient cooling of the storage cells.Separate, additional receptacles for contacting components can be avoided. Since the cell holder (also referred to as a carrier or designed as a carrier) and the contacting device are designed separately from each other, the cell holder can be designed simply and thus cost-effectively. For example, the cell holder is made of a plastic. For example, the cell holder is manufactured by injection molding, in particular by plastic injection molding.

[0023] In order to be able to produce the electrical energy storage device particularly simply and thus quickly and cost-effectively, as well as to provide particularly effective and efficient temperature control, i.e. cooling and / or heating, of the storage cells, one embodiment of the invention provides that the first of the domes are designed as supply domes inserted into the line elements from a first side, via which the temperature control medium can be introduced into the line elements. For example, the respective first end face of the respective storage cell is arranged on the first side, so that the respective supply dome penetrates the respective first end face or end surface, for example. The second of the domes are designed as discharge domes, via which the temperature control medium can be discharged from the line elements, i.e. can be discharged from the line elements, wherein the second domes are inserted into the line elements from a second side.In this case, the respective second side is located opposite the first side, in particular along the spacing direction or along the longitudinal extension direction. Thus, for example, the respective second end face is arranged on the respective second side, so that, for example, the respective second dome (discharge dome) penetrates the respective second end face or end surface.

[0024] It has proven particularly advantageous if the contacting device has a supply line element common to the supply domes and through which the temperature control medium can flow, via which the supply domes can be supplied with the temperature control medium. Preferably, the respective supply dome is designed as a solid body and is thereby inherently rigid. Preferably, the supply line element is designed as a solid body and is thereby preferably inherently rigid. It is conceivable for the supply domes and the supply line element to be formed integrally with one another, so that, for example, the supply domes and the supply line element are formed from a single piece, thus designed as a monoblock or are formed by a monoblock.Furthermore, it is conceivable for the supply domes to be formed separately from one another, and for the respective supply dome and the supply line element to be formed separately from one another, such that the supply domes formed separately from one another and separately from the supply line element are connected to the supply line element and mechanically connected to one another via the supply line element. In particular, it is conceivable for the supply domes and the supply line element to be formed from the same electrically conductive material, for example a metallic material, wherein it is conceivable for the supply domes to be electrically conductively connected to the supply line element and thus electrically conductively connected to one another via the supply line element. Thus, the supply domes and, via the supply domes, the line elements can be supplied with the temperature control medium in a simple, cost-effective and space-efficient manner.

[0025] A further embodiment is characterized in that the contacting device has a discharge line element common to the discharge domes and through which the temperature control medium can flow, into which the temperature control medium can be introduced from the discharge domes, so that the temperature control medium can be discharged from the discharge domes via the discharge line element. The previous and following explanations regarding the supply line element and the supply domes can also be readily applied to the discharge line element and the discharge domes, and vice versa. Thus, it is conceivable for the discharge domes and the discharge line element to be integrally formed with one another, thus being formed from a single piece, so that, for example, the discharge domes and the discharge line element are designed as a monoblock or are formed by a monoblock.In other words, it is preferably provided that the discharge domes and the discharge line element are not formed and assembled as components formed separately from one another and connected to one another, but rather the discharge domes and the supply line element are preferably formed integrally with one another. Preferably, the respective discharge dome is a solid body and is preferably inherently rigid. Furthermore, it is preferably provided that the supply line element is a solid body and is particularly inherently rigid. Furthermore, it is conceivable that the discharge domes are formed separately from one another and separately from the discharge line element, wherein the respective discharge dome is connected to the discharge line element, such that the discharge domes are connected to one another via the discharge line element.In particular, it is conceivable that the discharge domes and the discharge line element are formed from the same electrically conductive, and in particular metallic, material. In particular, it is conceivable that the respective discharge dome is electrically connected to the discharge line element, so that, for example, the discharge domes are electrically connected to the supply line element and thus electrically connected to one another via the supply line element. By means of the discharge domes and the discharge line element, the temperature control medium can be discharged from the line elements in a space-saving and cost-effective manner, thus enabling a compact and cost-effective design of the electrical energy storage device.

[0026] For example, the supply domes and the supply line element form a first structural unit, or the supply domes and the supply line element are formed by a first structural unit. For example, the discharge domes and the discharge line element form a second structural unit, or the discharge domes and the discharge line element are formed by a second structural unit. For example, the structural units are designed separately from one another. For example, the first structural unit is arranged on the first side, in particular such that the supply domes are inserted into the line elements from the first side. For example, the second structural unit is arranged on the second side, in particular such that the discharge domes are inserted into the line elements from the second side. This makes it possible to create a structure for the electrical energy storage device that is simple, time-efficient, and cost-effective to manufacture.

[0027] In order to be able to produce the electrical energy storage device in a particularly time- and cost-effective manner, a further embodiment of the invention provides that the cell holder has a first holder part arranged on the first side, by means of which the supply domes are held in the line elements and thus secured. Furthermore, the cell holder preferably has a second holder part arranged on the second side, by means of which the discharge domes are held in the line elements. The holder parts are formed separately from one another and connected to one another. In particular, the holder parts are, for example, latched together, i.e., connected to one another in a form-fitting manner. In particular, it is conceivable for the holder parts to be detachably connected to one another in a non-destructive manner, in particular latched.

[0028] In order to keep the number of parts and thus the costs and space requirements of the electrical energy storage device to a particularly low level, a further embodiment of the invention provides for the respective holder part to be designed as a single piece, i.e., formed from a single piece. Thus, the respective holder part is preferably designed as a monoblock or formed by a monoblock. In particular, the respective holder part can be formed from a plastic. For example, the respective holder part is manufactured by injection molding, in particular by plastic injection molding.

[0029] In order to be able to produce the electrical energy storage device particularly cost-effectively, a further embodiment of the invention provides that the first holder part has a first cover element arranged on the first side, from which first column parts of the first holder part protrude in a first direction pointing from the first side and from the first cover element to the second side. The second holder part has a second cover element arranged on the second side, from which second column parts of the second holder part protrude in a second direction pointing from the second side and from the second cover element to the first side and opposite the first direction. In this case, for example, the storage cells are at least partially overlapped and thus covered by the first cover element when viewed in the second direction.For example, when viewed in the first direction, the memory cells are at least partially overlapped, and thus covered, by the second cover element.

[0030] A respective one of the first column parts and a respective one of the second column parts form a respective column part pair, the respective second column part of which adjoins the respective first column part of the respective column part pair in the first direction. The respective column parts of the respective column part pair are connected to one another, in particular latched together. For example, the respective column parts of the respective column part pair are non-destructively releasably connected to one another, in particular latched together. As a result, the holder parts, which are preferably formed separately from one another, are easily and firmly connected to one another, in particular along the spacing direction. As a result, the holder parts can hold the domes securely and firmly in the line elements so that, for example, the domes cannot be pushed out of the line elements by corresponding pressure from the temperature control medium.

[0031] In order to be able to electrically contact the storage cells using the contacting device in a simple and space-efficient manner, a further embodiment of the invention provides that at least some of the domes form a dome group, i.e., are components or members of a dome group. The domes of the dome group, i.e., the domes forming the dome group, are mechanically connected to one another by a connecting element of the contacting device, which is preferably designed as a solid body and very preferably inherently rigid. For example, the domes of the dome group are formed integrally with the connecting element and thus integrally with one another, so that, for example, the domes of the dome group and the connecting element are formed from a single piece.Furthermore, it is conceivable that the domes of the dome group are formed separately from one another and separately from the connecting element and are mechanically connected to the connecting element, so that the domes of the dome group are mechanically connected to one another via the connecting element. In particular, it is conceivable, especially when the domes of the dome group are the supply domes, that the connecting element is or forms the supply line element. In particular when the domes of the dome group are the discharge domes, the connecting element is, for example, the discharge line element or the connecting element forms the discharge line element.

[0032] The connecting element has a channel which is common to the domes of the dome group and through which the temperature control medium can flow, via which the temperature control medium can be supplied to the domes of the dome group or can be removed from the domes of the dome group.

[0033] It has proven particularly advantageous if contacting fingers, in particular in addition to the domes of the dome group, protrude from the connecting element. For example, the contacting fingers are formed integrally with the connecting element, so that, for example, the connecting element and the contacting fingers are formed from a single piece, thus formed by a monoblock or designed as a monoblock. For example, the domes of the dome group protrude from the connecting element in a first spacing direction. For example, the contacting fingers, also simply referred to as fingers, arms or little arms, protrude from the connecting element in a second spacing direction, wherein, for example, the second spacing direction runs obliquely or preferably perpendicular to the first spacing direction.In the fully manufactured state of the electrical energy storage device, for example, the first spacing direction is the first direction, particularly when the domes of the dome group are the supply domes. Furthermore, it is conceivable for the first spacing direction to be the second direction, particularly when the domes of the dome group are the discharge domes. In particular, for example, the contacting fingers and the connecting element are formed from the same or the same electrically conductive, in particular metallic, material, wherein the contacting fingers are preferably electrically conductively connected to the connecting element.Furthermore, it is preferably provided that the domes of the dome group and the connecting element are formed from the same, electrically conductive, in particular metallic, material, wherein preferably the domes of the dome group are electrically conductively connected to the connecting element, so that preferably the domes of the dome group are electrically conductively connected to one another via the connecting element.

[0034] The aforementioned electrode terminals of the respective storage cell, also referred to as contact areas, are also referred to as electrical connection elements, since the storage cells are electrically connected to one another via their electrical connection elements. It is provided that in each case, in particular precisely, one of the contacting fingers is electrically contacted with in each case, in particular precisely, one of the electrical connection elements, thus the contact areas, of the respective storage cell, so that the storage cells are electrically connected to one another via their electrical connection elements and the contacting fingers, and in particular the connecting element.

[0035] For example, it is conceivable that the domes of the dome group, the connecting element, and the contacting fingers form the first or second component, i.e., are formed by the first component or the second component. This allows for a particularly simple and space-efficient electrical connection of the memory cells.

[0036] In order to be able to realize a particularly simple and cost-effective construction of the electrical energy storage device, it is provided in a further embodiment of the invention that between the respective contacting finger and the respective other connection element of the respective storage cell, with whose respective one connection element the respective contacting finger is electrically contacted, an electrical insulation element is arranged, for example, directly touching the respective contacting finger on the one hand and the respective further connection element on the other hand, by means of which the respective contacting finger is electrically insulated from the respective further connection element. The electrical insulation element is thus an insulator, i.e. a non-conductor, whose electrical conductivity is preferably less than 10 -8 S * cm -1The electrical insulation element can, for example, be a layer that is applied, for example, to the respective contacting finger. For example, the layer is formed by a film made in particular from a plastic, or the layer is formed by a coating such as a varnish. Alternatively or additionally, it is conceivable for the respective contacting finger to have a respective recess, formed, for example, by an indentation, through which the respective contacting finger is electrically spaced from the respective further connection element, such that electrical contact between the respective contacting finger and the respective further connection element is avoided.In this way, undesired electrical contact between the respective contact finger and the respective additional connection element can be avoided in a particularly simple and cost-effective manner, whereby undesired short circuits can be avoided in a particularly simple and cost-effective manner.

[0037] In order to achieve particularly effective and efficient temperature control of the storage cells in a particularly simple, cost-effective and space-saving manner, a further embodiment of the invention provides that the respective dome is sealed against the respective line element into which the respective dome is inserted by means of a respective sealing element formed separately from the respective line element and separately from the respective dome. For example, the respective sealing element is made of rubber. For example, the sealing element is a sealing ring, in particular an O-ring. This allows unwanted leaks to be prevented simply, in a space-saving and cost-effective manner.Furthermore, the sealing element can be a sleeve, in particular made of rubber, arranged, in particular inserted, between the respective dome and the respective storage cell, for example, wherein the sleeve has, for example, a collar or flange as a stop, via which the sleeve is supported, for example, at least indirectly, in particular directly, on the respective storage cell. For example, the respective dome penetrates the sleeve, so that, for example, the respective dome is inserted into the respective sleeve and / or pushed through the respective sleeve.

[0038] A further embodiment is characterized in that at least the first of the sealing elements are arranged in corresponding recesses of the respective cell housings. This allows for undesired relative movements between the first sealing elements and the cell housings to be avoided in a space-saving manner, thus preventing undesired leaks. This allows for effective and efficient temperature control. For example, if necessary and thus purely by way of example or option, the respective sealing element, also simply referred to as a seal, can be L-shaped, i.e., designed as an L-shaped seal.

[0039] In order to be able to realize particularly effective and efficient temperature control in a particularly space-saving and cost-effective manner, it is provided in a further embodiment of the invention that at least one respective component of the respective storage cell, which is formed separately from the respective cell housing and arranged in the respective receiving space, is fixed to the respective cell housing by the respective indentation. In other words, the indentation is preferably used to at least limit, in particular prevent, relative movements between the respective component and the respective cell housing. The indentation therefore preferably also has a dual function. On the one hand, the indentation is used to at least limit, in particular prevent, undesired relative movements between the component and the respective cell housing.Secondly, the recess is used to fix the respective first sealing element relative to the housing. This allows for a particularly cost-effective and space-saving design of the electrical energy storage device.

[0040] For example, the respective indentation is created by crimping.

[0041] Finally, it has proven particularly advantageous if the respective component has a respective contact element and / or a respective electrical heating element, in particular a PTC element. This embodiment is based on the finding that a fixing process, by means of which relative movements between the already provided component and the respective cell housing are at least limited, in particular prevented, is used to also fix the respective first sealing element to the respective cell housing. This allows the electrical energy storage device to be manufactured particularly cost-effectively.

[0042] A second aspect of the invention relates to a motor vehicle, preferably designed as a motor vehicle, in particular as a passenger car, with at least one electrical energy storage device according to the first aspect of the invention. Advantages and advantageous embodiments of the first aspect of the invention are to be regarded as advantages and advantageous embodiments of the second aspect of the invention, and vice versa.

[0043] A third aspect of the invention relates to an electrical energy storage device for storing electrical energy for a motor vehicle, comprising a plurality of storage cells designed to store the electrical energy, each of which has a cell housing defining a receiving space and a conducting element through which a temperature control medium can flow and which penetrates the receiving space, and comprising a contacting device designed separately from the storage cells, via which contacting device the storage cells are electrically connected to one another.

[0044] In order to be able to realize particularly advantageous temperature control, i.e. cooling and / or heating, of the storage cells in a particularly space-saving and cost-effective manner, the invention provides that the respective line element has a respective dome through which the temperature control medium can flow and which is inserted into a channel system of the contacting device through which the temperature control medium can flow, wherein the temperature control medium can be introduced from the channel system of the contacting device into the line elements via the domes and / or can be discharged from the line elements and introduced into the channel system of the contacting device. The storage cells are held on a cell holder which is formed separately from the storage cells and separately from the contacting device and at least limits relative movements between the storage cells and by means of which cell holder the domes are held in the line elements.Advantages and advantageous embodiments of the first and second aspects of the invention are to be regarded as advantages and advantageous embodiments of the third aspect of the invention, and vice versa. The third aspect is thus, so to speak, the kinematic reversal of the first aspect of the invention, since in the first aspect of the invention, the domes of the contacting device are inserted into the line elements, and since in the third aspect of the invention, the domes of the line elements are inserted into the contacting device, whose channel system can be flowed through by the temperature control medium. Thus, the contacting device, in the interior of which the channel system is arranged or runs, can be flowed through by the temperature control medium.

[0045] Further details of the invention will become apparent from the following description of a preferred embodiment and from the drawings. In the drawings: Fig. 1 is a schematic exploded view of an electrical energy storage device for a motor vehicle; Fig. 2 a schematic perspective view of two structural units of the electrical energy storage device; Fig. 3 a schematic perspective view of one of the structural units; Fig. 4 a schematic perspective view of an electrical insulation element of the electrical energy storage device; Fig. 5 a further schematic perspective view of the assembly according to Fig. 3; Fig. 6 a schematic perspective view of a starting workpiece from which the assembly according to Fig. 5 can be produced; Fig. 7 a schematic sectional view of the electrical energy storage device; Fig. 8 shows a further schematic sectional view of the electrical energy storage device; Fig. 9 a schematic perspective view of storage cells of the electrical energy storage device; Fig. 10 is a further schematic sectional view of the electrical energy storage device; and Fig. 11 shows a partial schematic top view of the electrical energy storage device.

[0046] In the figures, identical or functionally identical elements are provided with the same reference numerals.

[0047] Fig. 1 shows a schematic exploded view of an electrical energy storage device 1 for a motor vehicle. This means that the motor vehicle, preferably designed as a motor vehicle, in particular as a passenger car, in its fully manufactured state has the electrical energy storage device 1, also referred to simply as a storage device. As will be explained in more detail below, electrical energy or electrical current can be stored, in particular electrochemically, in the energy storage device 1 or by means of the energy storage device 1, so that the electrical energy storage device 1 is preferably a battery, in particular a secondary battery.In particular, the energy storage device 1 is a high-voltage battery, i.e. a high-voltage storage device (HV storage device) whose electrical voltage, in particular electrical operating or nominal voltage, is preferably greater than 50 volts, in particular greater than 60 volts, and very preferably amounts to several hundred volts. The energy storage device 1 has a plurality of storage cells 2, which in the embodiment shown in the figures are designed as round cells and thus cylindrical on the outer circumference. The electrical energy can be stored, in particular electrochemically, in or by means of the storage cells 2, so that the respective storage cell 2 is preferably designed as a secondary cell. It can be seen that the storage cells 2 are components formed separately from one another and are therefore individual cells.

[0048] The respective memory cell 2 has a respective, in Fig. 1 by a double arrow 3 and thus a longitudinal extension running along the longitudinal extension direction. The respective storage cell 2 has a respective first end face S1 and a respective second end face S2, wherein the end faces S1 and S2 of the respective storage cell 2 face away from one another in the longitudinal extension direction of the respective storage cell 2 and are arranged at respective, in particular free, ends of the respective storage cell 2. The respective storage cell 2 has two connections, also referred to as electrode connections, electrical connection elements or terminals, which are also referred to as connection regions or contacting regions or are designed as connection regions or contacting regions.As explained in more detail below, the storage cells 2 are electrically connected to one another via their electrode terminals, i.e., via their contact areas, and are connected, for example, in series or parallel. In particular, it is conceivable that the respective contact areas of the respective storage cell 2 can be arranged on the same respective end face S1 and / or S2.

[0049] How particularly good in conjunction with Fig. 7, the respective storage cell 2 has a respective cell housing 4 and a respective receiving space 5, which is formed or delimited, in particular directly, by the respective cell housing 4. In this case, for example, a respective storage device 6 of the respective storage cell 2 is arranged in the respective receiving space 5, wherein the electrical energy can be stored by means of the respective storage device 6. The respective storage cell 2 also has a respective line element 7, through which a preferably liquid temperature control medium can flow, as for example in Fig. 7 is illustrated by arrows. The end faces S1 and S2 are, for example, end faces or are formed by end faces. It is conceivable that the line element 7 can be formed separately from at least one of the end faces S1 and S2 and can be connected to the at least one end face S1, S2. Furthermore, Fig. 7 that the respective line element 7 has or, in particular, directly delimits a respective channel 8 through which the temperature control medium can flow. The respective line element 7 and thus the respective channel 8, which is also referred to as a temperature control channel, penetrate or pass through the respective receiving space 5 of the respective storage cell 2 and thus, for example, the respective storage device 6 of the respective storage cell 2.

[0050] Out of Fig. 1 shows that the energy storage device 1 also has a contacting device 9 formed separately from the storage cells 2, via which the storage cells 2 are electrically connected to one another. For this purpose, the contacting device 9 is electrically contacted, in particular directly, with the respective contact areas of the respective storage cell 2, so that the storage cells 2 are electrically connected to one another via their respective contact areas and via the contacting device 9. In particular, the contacting device 9 is formed from an electrically conductive, metallic material.

[0051] A first of the respective contact regions is or forms, for example, a first electrical pole of the respective memory cell 2. The second contact region of the respective memory cell 2 forms or is, for example, a second electrical pole of the respective memory cell 2, wherein the first electrical pole has a first electrical polarity and the second electrical pole has a second electrical polarity that is different from the first polarity and, in particular, opposite to the first electrical polarity. Thus, for example, the first electrical pole is a positive electrical pole, so that, for example, the respective first contact region is also referred to as a cathode terminal or cathode. For example, the second electrical pole is a negative electrical pole, so that the second contact region is also referred to as an anode terminal or anode. Fig. 9 and Fig. 11 the respective cathode is marked with a plus sign, and the respective anode is marked with a minus sign.

[0052] In order to be able to realize a particularly space-saving and cost-effective construction of the electrical energy storage device 1 as well as a particularly advantageous temperature control, i.e. cooling and / or heating of the storage cells 2, as is particularly well shown Fig. 1 to 7, the contacting device 9 has domes 10 and 11 through which the temperature control fluid can flow and which are inserted into the line elements 7, via which domes the temperature control medium can be introduced into the line elements 7 and discharged from the line elements 7, i.e. can be discharged from the line elements 7. Furthermore, the electrical energy store 1 has a cell holder 12 which is formed separately from the storage cells 2 and separately from the contacting device 9 and is also simply referred to as a holder, which in the embodiment shown in the figures has at least or exactly two holder parts 13 and 14. Preferably, the holder part 13 and / or the holder part 14 are formed in one piece, i.e. from a single piece. For example, the holder part 13 and / or the holder part 14 are formed from a plastic.For example, the holder part 13 and / or the holder part 14 is manufactured by injection molding, in particular by plastic injection molding. It is generally conceivable for the holder parts 13 and 14 to be identical, i.e., structurally identical, whereby, for example, the holder parts 13 and 14 can be manufactured using the same tool, or using the same tool, in particular using the same injection molding tool. This allows the cell holder 12 to be manufactured particularly cost-effectively. Fig. 1 that the holder parts 13 and 14 are components that are formed separately from one another and are connected to one another, in particular in a non-destructive manner. In the exemplary embodiment shown in the figures, the holder parts 13 and 14 are locked together in the fully manufactured state of the energy storage device 1 and are thus clipped together, i.e., they are connected to one another in a form-fitting manner. The storage cells 2 are supported, in particular directly, on the cell holder 12 and are held on the cell holder 12, whereby relative movements between the storage cells 2 among one another as well as relative movements between the respective storage cell 2 and the cell holder 12 are at least limited, preferably prevented. In addition, the storage cells 2 are held at a respective distance from one another by means of the cell holder 12, and the storage cells 2 are held by means of the cell holder 12 in a particularly well-designed Fig. 1 recognizable pattern relative to each other. In this case, for example, first of the memory cells 2 are arranged in a first cell row R1, while second of the memory cells 2 are arranged in a second cell row R2. This is to be understood in particular that the first memory cells 2 are arranged successively along a first straight line, whereby the first memory cells 2 form the first cell row R1, and the second memory cells 2 are arranged successively along a second straight line, whereby the second memory cells 2 form the second cell row R2. The first straight line and the second straight line preferably run parallel to each other, so that the cell rows R1 and R2 are arranged next to each other, in particular along a Fig. 1 by a double arrow 15 and perpendicular to the respective longitudinal direction of the respective storage cell 2, perpendicular to the first straight line, and perpendicular to the second straight line, which coincides with a direction referred to as the following direction. In particular, the storage cells 2 are structurally identical or have an identical design.

[0053] By means of the cell holder 12, which is formed separately from the contacting device 9 and separately from the storage cells 2, the domes 10 and 11 are held in the line elements 7 and thus secured, so that by means of the cell holder 12 relative movements between the respective dome 10, 11 and the respective line element 7 are at least limited, in particular prevented.

[0054] It can be seen that the contacting device 9 has several first structural units 16 and several second structural units 17. One of the structural units 16 is in Fig. 2, and one of the units 17 is also shown in Fig. 2. The modules 16 are identical, i.e., structurally identical, and the modules 17 are identical, i.e., structurally identical, with the respective module 16 and the respective module 17 differing from one another in their constructions. This will be explained in more detail below. It can be seen that some of the modules 16 and some of the modules 17 are arranged on a first side SE1 of the memory cells 2, such that the modules 16 and 17 arranged on the side SE1 alternate along the third straight line, i.e., along the sequential direction illustrated by the double arrow 15, i.e., are arranged in alternating succession. Some of the modules 16 and some of the modules 17 are arranged on a second side SE2 of the memory cells 2, with the second side SE2 being opposite the first side SE1 in the longitudinal direction of the memory cells 2.The structural units 16 and 17 arranged on the second side SE2 are arranged alternately, i.e. alternating, one after the other along the direction illustrated by the double arrow 15, i.e. along the third straight line.

[0055] The domes 10 are first domes or are also referred to as first domes, whereby the domes 10 are supply domes that are inserted into the line elements 7 from the first side SE1. This is particularly good from Fig. 7. The tempering fluid can be introduced into the line elements 7 via the supply domes (domes 10), as shown in Fig. 7 is illustrated by the arrows shown there. The domes 11 are second domes or are also referred to as second domes, wherein the domes 11 (second domes) are inserted into the line elements 7 from the second side SE2 opposite the first side SE1 in the longitudinal direction of the respective storage cell 2. The second domes 11 are, as can be seen particularly well from Fig. 7, discharge domes, through which the tempering medium can be discharged from the line elements 7, i.e. can be discharged from the line elements 7. This is also shown in Fig. 7 by the arrows shown there. Fig. 1 it can be seen that the supply domes are the domes 10 of the structural units 16 and 17 arranged on the first side SE1, and the domes 11 are the domes 11 of the structural units 16 and 17 arranged on the side SE2. Since the temperature control medium is introduced into the line elements 7 via the structural units 16 and 17 arranged on the side SE1, the structural units 16 and 17 arranged on the side SE1 are also referred to as supply units. Since the temperature control medium is discharged from the line elements 7 via the structural units 16 and 17 arranged on the side SE2, the structural units 16 and 17 arranged on the second side SE2 are also referred to as discharge units. Thus, the Fig. The structural units 16 and 17 shown in Figure 2 can be two of the discharge units or two of the supply units. The structural units 16 and 17, i.e. the discharge units and the supply units, are structural units, i.e. components or parts of the contacting device 9. The contacting device 9 thus has a dual function. On the one hand, the contacting device 9 is electrically contacted, in particular directly, with the contact areas of the storage cell 2, so that the storage cells 2 are electrically connected to one another via the contacting device 9. On the other hand, the temperature control medium is conducted by means of the contacting device 9 in such a way that the temperature control medium is introduced into the line elements 7 by means of the contacting device 9 and discharged from the line elements 7. The cell holder 12 also has a dual function.On the one hand, the cell holder 12 is used to at least limit, and in particular to prevent, relative movements between the storage cells 2. On the other hand, the cell holder 12 is used to secure the domes 10 and 11 in the conduction elements 7.

[0056] It can be seen that the respective cell row R1, R2 is assigned, in particular, exactly one of the supply units and, in particular, exactly one of the removal units. Furthermore, the respective cell row R1, R2 is assigned, in particular, exactly one of the structural units 16 and, in particular, exactly one of the structural units 17. For example, if the supply unit assigned to the respective cell row R1, R2 is formed by one of the structural units 16, the removal unit assigned to the respective cell row R1, R2 is formed by one of the structural units 17. Furthermore, it is provided that if the supply unit assigned to the respective cell row R1, R2 is formed by one of the structural units 17, the removal unit assigned to the respective cell row R1, R2 is formed by one of the structural units 16. In the Fig. 1, the supply unit assigned to the cell row R1 is formed by one of the structural units 16 and the removal unit assigned to the cell row R1 is formed by one of the structural units 17, and the supply unit assigned to the cell row R2 is formed by one of the structural units 17, and the removal unit assigned to the cell row R2 is formed by one of the structural units 16.

[0057] Out of Fig. 2 it can be seen that the domes 10, 11 of the respective structural unit 16, 17 form a dome group, wherein the domes 10, 11 of the respective structural unit 16, 17 forming the dome group are mechanically connected to each other by a respective connecting element 18 of the respective structural unit 16, 17. Fig. 7 shows that the respective connecting element 18 has a channel 19 common to the domes 10, 11 of the dome group and through which the temperature control medium can flow, via which the temperature control medium can be supplied to the domes 10, 11 of the dome group or discharged from the domes 10, 11 of the dome group. If, for example, the structural unit 16, 17 is used as one of the supply units, the channel 19 is a supply channel via which the temperature control medium can be supplied to the domes 10, 11 of the dome group. If the respective structural unit 16, 17 is used, for example, as one of the discharge units, the channel 19 is or functions as a discharge channel via which the temperature control medium can be discharged from the domes 10, 11 of the dome group. If the assembly unit 16, 17 is used as one of the feed units, the domes 10, 11 of the dome group are the previously described feed domes (Dome 10).If the respective construction unit 16, 17 is used as one of the discharge units, the domes 10, 11 of the dome group are the discharge domes (Dome 11).

[0058] With regard to the structural units 16 and 17 (supply units) arranged on the side SE1, the respective connecting element 18 of the respective supply unit is a respective supply line element common to the respective supply domes (domes 10) of the respective supply unit and through which the temperature control medium can flow, via which the respective supply domes of the respective supply unit can be supplied with the temperature control medium.With regard to the structural units 16 and 17 (discharge units) arranged on the SE2 side, the respective connecting element 18 of the respective discharge unit is a discharge line element which is common to the respective discharge domes (domes 11) of the respective discharge unit and through which the temperature control medium can flow, into which the temperature control medium can be introduced from the respective discharge domes of the respective discharge unit, so that the temperature control medium can be discharged from the respective discharge domes of the respective discharge unit via the respective discharge line element of the respective discharge unit.

[0059] Out of Fig. 1 shows that the holder part 13 is arranged on the SE1 side and the holder part 14 is arranged on the SE2 side. The holder parts 13 and 14 are formed separately from one another and connected to one another, so that the supply domes are held, i.e., secured, in the line elements 7 by means of the holder part 13 and the discharge domes by means of the holder part 14.

[0060] The first holder part 13 has a first cover element 20 arranged on the first side SE1, from which first column parts 22 protrude in a first direction pointing from the first side SE1 and from the first cover element 20 to the second side SE2, indicated by an arrow 21. The second holder part 14 has a second cover element 23 arranged on the second side SE2, from which second column parts 25 of the second holder part 14 protrude in a second direction pointing from the second side SE2 and from the second cover element 23 to the first side SE1 and thus to the first cover element 20, opposite to the first direction and indicated by an arrow 24. A respective one of the first column parts 22 and a respective one of the second column parts 25 form a respective column part pair 29, which is particularly well-known from Fig. 7 can be seen. The respective second column part 25 of the respective column part pair 29 adjoins the respective first column part 22 of the respective column pair 29 in the first direction. The respective column parts 22 and 25 of the respective column part pair 29 are connected to one another, in particular locked to one another. In particular, for example, the first holder part 13 is supported in the first direction, in particular directly, on the supply units. Furthermore, it is conceivable that the second holder part 14 is supported in the second direction, in particular directly, on the discharge units. As a result, the domes 10 and 11 are held securely and firmly in the line elements 7.

[0061] If necessary, the respective line element 7 and / or the respective dome 10, 11 can be insulated, particularly on the side of the temperature control medium, also referred to as fluid, for example by a coating and / or painting and / or in some other way. The background in this regard may be that the line element 7, for example formed as a tube and / or as a solid body and / or from a metallic material and / or from an electrically conductive material, and / or the dome 10, 11, for example formed as a tube and / or as a solid body and / or from a metallic material and / or from an electrically conductive material, can be an anode -, for example, but the connecting element can sometimes electrically contact the anode - and sometimes the cathode +. The insulation can prevent a short circuit.

[0062] It can be seen that the respective dome 10, 11 is sealed against the respective line element 7, into which the respective dome 10, 11 is inserted, by means of a respective sealing element 42 formed separately from the respective line element 7 and separately from the respective dome 10, 11. The sealing element, also simply referred to as a seal, could, for example, be designed as an L-shaped seal. In the present case, it is provided that at least the first of the sealing elements 42 are arranged in corresponding recesses 43 of the respective cell housings 4.

[0063] The sealing element, which is designed, for example, and thus only optionally, as an O-ring, keeps the respective dome 10, 11 away from the line element 7, which is designed, for example, as an inner tube. At an electrical potential of, for example, 4 volts, the distance between the respective dome 10, 11 and the line element should be at least 1.6 millimeters to ensure a sufficient creepage distance. It is conceivable to completely electrically insulate the connecting element 18 inside and out, especially except for those locations where electrical contact is desired.

[0064] The respective storage cell 2 is assigned to respective column part pairs 29. The respective column part pairs 29 assigned to the respective storage cell 2 are arranged successively and spaced apart from one another in the circumferential direction extending around the longitudinal direction of the respective storage cell 2, to which the respective column part pairs 29 are assigned. The respective circumferential direction of the respective storage cell 2 is in Fig. 11 is illustrated by a double arrow 30.

[0065] Out of Fig. 2 that the respective domes 10, 11 of the respective dome group and thus of the respective structural unit 16, 17 protrude in a first spacing direction from the respective connecting element 18 of the respective structural unit 16, 17. The first spacing direction is illustrated by an arrow 31. The respective structural unit 16 differs in particular from the respective structural unit 17 in that contacting fingers 32 protrude from the respective connecting element 18 of the respective structural unit 16 in a second spacing direction illustrated by an arrow 26, wherein the second spacing direction runs obliquely or, in this case, perpendicular to the first spacing direction. The respective structural unit 17 does not have these contacting fingers 32. In particular, it is conceivable that the respective connecting element 18 and the respective contacting fingers 32 are formed integrally with one another, thus being formed from a single piece. Fig. 11 it can be seen that the respective contacting finger 32 is electrically contacted with one of the electrical connection elements of one of the storage cells 2. With regard to the cell row R1, for example, the following is provided: For example, the connecting element 18 of the structural unit 16 arranged on the first side SE1 and assigned to the cell row R1 is electrically contacted with the cathodes + of the storage cells 2 of the cell row R1, whereby, for example, the cathodes of the storage cells 2 of the cell row R1 are electrically connected to one another via the connecting element 18 of the structural unit 16 assigned to the cell row R1 and arranged on the first side SE1, or the connecting element 18 of the structural unit 16 arranged on the first side SE1 and assigned to the cell row R1 is electrically insulated or galvanically separated from the cathodes + of the storage cells 2 of the cell row R1.The respective contacting finger 32 of the assembly 16 assigned to the cell row R1 and arranged on the first side SE1 is electrically contacted with the respective anode - of the respective storage cell 2 of the cell row R2. Furthermore, the respective contacting finger 32 of the assembly 16 assigned to the cell row R1 and arranged on the first side SE1 is electrically contacted with the respective cathode + of the respective storage cell 2 of the cell row R1.

[0066] The structural unit 17 assigned to cell row R2 and arranged on the first side SE1, and following the structural unit 16 assigned to cell row R1 and arranged on the first side SE1 along the third straight line, whose domes 10 are used as supply domes by means of which the temperature control medium can be introduced into the conducting elements 7 of the storage cells 2 of cell row R2, is, for example, electrically contacted neither with the anodes - nor with the cathodes + of the storage cells 2 of the second cell row R2. For this purpose, for example, the structural unit 17 assigned to cell row R2 and arranged on the first side SE1 is electrically insulated from the two contact areas, i.e., from both the respective anode and the respective cathode of the respective storage cell 2 of cell row R2.Furthermore, the structural unit 17 assigned to the cell row R2 and arranged on the first side SE1 and following the structural unit 16 assigned to the cell row R1 and arranged on the first side SE1 along the third straight line is not electrically contacted with either the anodes or the cathodes of the storage cells 2 of the first cell row R1. Furthermore, the structural unit 17 assigned to the cell row R2 and arranged on the first side SE1 and following the structural unit 16 assigned to the cell row R1 and arranged on the first side SE1 along the third straight line is not electrically contacted with either the anodes or the cathodes of the storage cells 2 of a third cell row R3, which immediately follows the second cell row R2 along the third straight line.For example, the structural unit 17 assigned to the cell row R2 and arranged on the first side SE1 and following the structural unit 16 assigned to the cell row R1 and arranged on the first side SE1 along the third straight line is not electrically contacted with any contact areas of the memory cells 2.

[0067] With regard to the structural unit 16 assigned to the cell row R2 and arranged on the second side SE2, the behavior with respect to the memory cells 2 of the cell row R2 is, for example, the same as with the structural unit 16 assigned to the cell row R1 and arranged on the first side SE1 with respect to the memory cells 2 of the cell row R1.Thus, for example, it is provided that the connecting element 18 of the structural unit 16 assigned to the cell row R2 and arranged on the second side SE2 is electrically contacted with the cathodes of the storage cells 2 of the cell row R2, so that, for example, the cathodes of the storage cells 2 of the cell row R2 are electrically connected to one another via the connecting element 18 of the structural unit 16 assigned to the cell row R2 and arranged on the second side SE2, or the connecting element 18 of the structural unit 16 assigned to the cell row R2 and arranged on the second side SE2 is electrically insulated or galvanically separated from the cathodes of the storage cells 2 of the cell row R2.

[0068] The respective contacting finger 32 of the assembly 16 assigned to the cell row R2 and arranged on the second side SE2 is electrically contacted with the respective anode - the respective storage cell 2 of the third cell row R3. Furthermore, the respective contacting finger 32 of the assembly 16 assigned to the cell row R2 and arranged on the second side SE2 is electrically contacted with the respective cathode - the respective storage cell 2 of the second cell row R2. It can be seen that third of the storage cells 2 are arranged consecutively along a fourth straight line and thereby form the third cell row R3, which is arranged along the third straight line and thus along the sequential direction illustrated by the double arrow 15 next to the second cell row R2, such that the second cell row R2 is arranged along the third straight line between the cell rows R1 and R3.With regard to the structural unit 16 assigned to the cell row R3 and arranged on the first side SE1, the situation with regard to the memory cells 2 of the cell row R3 is the same as with the structural unit 16 assigned to the cell row R1 and arranged on the first side SE1 with regard to the memory cells 2 of the cell row R1.This means that the connecting element 18 of the structural unit 16 assigned to the cell row R3 and arranged on the first side SE1 is electrically contacted with the cathodes of the storage cells 2 of the third cell row R3, so that the cathodes + of the storage cells 2 of the third cell row R3 are electrically connected to one another via the connecting element 18 of the structural unit 16 assigned to the cell row R3 and arranged on the first side SE1, or the connecting element 18 of the structural unit 16 assigned to the cell row R3 and arranged on the first side SE1 is electrically insulated from the cathodes + of the storage cells 2 of the third cell row R3 and, for example, also from their anodes -.The respective contacting finger 32 of the structural unit 16 assigned to the cell row R3 and arranged on the first side SE1 is electrically contacted with the respective anode - of the respective storage cell 2 of a fourth cell row R4, wherein fourths of the storage cells 2 are arranged one after the other along a fifth straight line and thereby form the fourth cell row R4. The respective contacting finger 32 of the structural unit 16 assigned to the cell row R3 and arranged on the first side SE1 is also electrically contacted with the respective cathode + of the respective storage cell 2 of the third cell row R3. The fourth cell row R4 is arranged along the third straight line next to the third cell row R3, so that along the third straight line the third cell row R3 is arranged between the cell rows R2 and R4. This means that the anodes and cathodes of the storage cells 2 and thus the storage cells 2 are connected along one or via a line shown in . Fig. 8 are electrically connected to one another via a connection path illustrated by a dashed line. For example, the respective structural unit 16, 17 can be integrally connected, in particular welded, to the respective storage cell 2.

[0069] Out of Fig. 9 it can be seen that the respective cell housing 4 can have a respective housing shell 33, which can be arranged or run between the respective end faces S1 and S2 of the respective storage cell 2, in particular viewed along the respective longitudinal extension direction of the respective storage cell 2. In this case, for example, at least part of the cathode is formed by the housing shell 33. Furthermore, it is conceivable that, for example, one, in particular another, part of the cathode is formed by the end face S1 and / or S2. Furthermore, it is conceivable that at least part of the anode is formed by the end face S2 and / or S2.

[0070] In Fig. 4 shows an electrical insulation element in a schematic perspective view and is designated by 34. For example, the insulation element is designed as a coating and / or as a film and / or made of a plastic and / or a lacquer. All possible embodiments, materials, and configurations are conceivable for implementing the insulation element 34. The insulation element 34 is used, for example, to prevent electrical contact between the respective connecting element 18 and the contact areas of the respective storage cell 2.Thus, for example, with regard to the respective structural unit 16, it can be provided that the electrical insulation element 34 is arranged, in particular in the longitudinal direction of the respective storage cell 2, between the respective connecting element 18 of the respective structural unit 16 and the respective cathode and / or the respective anode of the respective storage cell 2, so that by means of the insulation element 34 the respective connecting element 18 of the respective structural unit 16 is electrically insulated from the respective cathode and / or anode of the respective storage cell 2. The insulation element 34 can alternatively or additionally also be used for the respective connecting element 18 of the respective structural unit 17, so that it is conceivable that the insulation element 34 is arranged between the respective connecting element 18 and the respective structural unit 17 and the respective anode and / or the respective cathode of the respective storage cell 2.It is thus conceivable that the respective connecting element 18 of the respective structural unit 17 is electrically insulated from the respective anode and / or the respective cathode of the respective storage cell 2 by means of the electrical insulating element 34. For example, the electrical insulating element 34 can be a film, which is also referred to as an insulating film. The insulating element 34 can be arranged loosely on the respective connecting element 18, or the insulating element 34 is glued to the connecting element 18 or glued onto the connecting element 18 or applied to the connecting element 18, in particular as a lacquer and / or coating and / or otherwise, so that, for example, the connecting element 18 is provided with the insulating element 34, in particular coated.

[0071] In Fig. 3, dashed lines illustrate an insulation region 27 in which, for example, a further electrical insulation element can be arranged or is arranged. By means of the further electrical insulation element, for example, the respective contacting finger 32 can be electrically insulated from at least or precisely one of the contact regions of the respective memory cell 2, so that, for example, the further electrical insulation element prevents the respective contacting finger 32 from simultaneously touching both contact regions of the respective memory cell 2, thus simultaneously electrically contacting both contact regions of the respective memory cell 2.Alternatively or in addition to the use of the further electrical insulation element, it would be conceivable for the respective contacting finger 32 to have an indentation by means of which the respective contacting finger 32 is spaced from one of the contact regions of the respective storage cell 2, thereby preventing electrical contact between the respective contacting finger 32 and the respective contact region of the respective storage cell 2. This can also prevent the respective contacting finger 32 from electrically contacting both contact regions of the respective storage cell 2 at the same time. In particular, it is conceivable for the respective contacting finger 32 to be integrally connected, in particular welded, to the respective storage cell 2, i.e. to the respective contact region of the respective storage cell 2.

[0072] For example, the domes 10, 11 of the respective structural unit 16, 17 are formed separately from one another and separately from the respective connecting element 18 of the respective structural unit 16, 17. It is conceivable that the respective dome 10, 11 of the respective structural unit 16, 17 is materially connected to the respective connecting element 18 of the respective structural unit 16, 17. In particular, the respective dome 10, 11 can be soldered or welded to the respective connecting element 18 of the respective structural unit 16, 17. The connecting element 18 can, for example, be formed as an extruded profile. Furthermore, it is conceivable that the respective structural unit 16, 17 is formed in one piece, whereby it is conceivable that the respective structural unit 16, 17 can be produced, for example, by injection molding, in particular by die casting.

[0073] In Fig. 6 shows a schematic perspective view of a starting workpiece and is designated by 36. In Fig. 6, for example, areas are designated by 37, wherein the areas 37 are separated from the remaining starting workpiece 36, in particular by punching, especially by punching out, in order to thereby produce from the starting workpiece 36, for example, the structural unit 16 having the contacting fingers 32. Fig. 6 shows that in the starting workpiece 36, the channel 19 is still open at both ends. For example, to close the channel 19 at one of its two ends, the connecting element 18, in particular the extrusion profile, is reshaped at one end such that two wall regions delimiting the channel 19 are moved toward each other, in particular pressed together. This is evident from Fig. 5 recognizable. In Fig. 5, one end of the channel 19, which is or will be closed at one end, is designated E1. It is conceivable to weld the connecting element 18 at one end E1, in particular by means of a laser, in order, for example, to securely close and thus seal the channel 19 at one end E1.

[0074] Out of Fig. 10 shows that the connecting element 18 can have a connection 40. For example, a line part formed separately from the connecting element 18 can be mechanically and fluidically connected to the connection 40, so that the temperature control medium can flow through the line part and the channel 19 and thus the connecting element 18. As shown in Fig.10 is illustrated by arrows, for example, the connection 40 arranged on the first side SE1 can be an inlet, so that the domes 10 then function as supply domes. Accordingly, the connection 40 arranged on the second side SE2 is a return, through which the temperature control medium flowing through the discharge domes (dome 11) flows. The reverse is conceivable, so that the connection 40 arranged on the side SE1 can function as a return and thus the domes 10 can function as discharge domes. Accordingly, the connection 40 arranged on the side SE2 can function as an inlet, so that the domes 11 arranged on the second side SE2 then function as supply domes. List of reference symbols 1 electrical energy storage unit 2 memory cells 3 double arrow 4 cell housings 5 Recording room 6 Storage device 7 Line element 8 channel 9 Contacting device 10 Cathedral 11 Cathedral 12 cell holders 13 first holder part 14 second holder part 15 Double arrow 16 first building unit 17 second building unit 18 Connecting element 19 Channel 20 first deck element 21 Arrow 22 first column part 23 second deck element 24 Arrow 25 second column part 26 Arrow 27 Isolation area 29 Pair of column parts 30 double arrow 31 Arrow 32 contact fingers 33 Housing shell 34 Insulation element 36 Starting workpiece 37 Area 40 connection 42 Sealing element 43 indentation E1 end R1 cell row R2 cell row R3 cell row R4 cell row S1 front side S2 front side SE1 page SE2 page + Cathode - Anode

Claims

[1] Electrical energy storage device (1) for storing electrical energy for a motor vehicle, comprising a plurality of storage cells (2) designed to store the electrical energy, each of which has a cell housing (4) defining a receiving space (5) and a conducting element (7) through which a temperature control medium can flow and which penetrates the receiving space (5), and comprising a contacting device (9) designed separately from the storage cells (2), via which the storage cells (2) are electrically connected to one another, characterized by , that: - the contacting device (9) has domes (10, 11) through which the temperature control medium can flow and which are inserted into the line elements (7), via which the temperature control medium can be introduced into the line elements (7) and / or discharged from the line elements (7), and - the storage cells (2) are held on a cell holder (12) which is formed separately from the storage cells (2) and separately from the contacting device (9) and at least limits relative movements between the storage cells (2), by means of which the domes (10, 11) are held in the line elements (7). [2] Electrical energy storage device (1) according to claim 1, characterized by , that: - the first of the domes (10, 11) are designed as supply domes inserted into the line elements (7) from a first side (SE1), via which the temperature control medium can be introduced into the line elements (7), and / or - second of the domes (10, 11) are designed as discharge domes inserted into the line elements (7) from a second side (SE2) opposite the first side (SE1), via which the temperature control medium can be discharged from the line elements (7). [3] Electrical energy storage device (1) according to claim 2, characterized bythat the contacting device (9) has a supply line element which is common to the supply domes and through which the temperature control medium can flow, via which the supply domes can be supplied with the temperature control medium. [4] Electrical energy storage device (1) according to claim 2 or 3, characterized by that the contacting device (9) has a discharge line element which is common to the discharge domes and through which the temperature control medium can flow, into which the temperature control medium can be introduced from the discharge domes, so that the temperature control medium can be discharged from the discharge domes via the discharge line element. [5] Electrical energy storage device (1) according to one of claims 2 to 4, characterized by , that: - the cell holder (12) has a first holder part (13) arranged on the first side (SE1), by means of which the feed domes are held in the line elements (7), - the cell holder (12) has a second holder part (14) arranged on the second side (SE2), by means of which the discharge domes are held in the line elements (7), and - the holder parts (13, 14) are formed separately from one another and connected to one another. [6] Electrical energy storage device (1) according to claim 5, characterized by that the respective holder part (13, 14) is formed in one piece. [7] Electrical energy storage device (1) according to claim 5 or 6, characterized by , that: - the first holder part (13) has a first cover element (20) arranged on the first side (SE1), from which first column parts (22) of the first holder part (13) protrude in a first direction (21) pointing from the first side (SE1) and from the first cover element (20) to the second side (SE2), - the second holder part (14) has a second cover element (23) arranged on the second side (SE2), from which second column parts (25) of the second holder part (14) protrude in a second direction (24) pointing from the second side (SE2) and from the second cover element (23) to the first side (SE1) and opposite to the first direction (21), - a respective one of the first column parts (22) and a respective one of the second column parts (25) form a respective column part pair (29), the respective second column part (25) of which adjoins the respective first column part (22) of the respective column part pair (29) in the first direction (21), and - the respective column parts (22, 25) of the respective column part pair (29) are connected to one another. [8] Electrical energy storage device (1) according to one of the preceding claims, characterized by , that: - at least some of the domes (10, 11) form a dome group, the domes (10, 11) of which are mechanically connected to one another by a connecting element (18) of the contacting device (9), - the connecting element (18) has a channel (19) which is common to the domes (10, 11) of the dome group and through which the temperature control medium can flow, via which the temperature control medium can be fed to the domes (10, 11) of the dome group or removed from the domes (10, 11) of the dome group. [9] Electrical energy storage device (1) according to claim 8, characterized by that contacting fingers (32) protrude from the connecting element (18), wherein each of the contacting fingers (32) is electrically contacted with an electrical connection element of each of the storage cells (2). [10] Electrical energy storage device (1) according to claim 9, characterized bythat between the respective contacting finger (32) and a respective further connection element of the respective memory cell (2), with whose respective one connection element the respective contacting finger (32) is electrically contacted, an electrical insulation element (34) is arranged, by means of which the respective contacting finger (32) is electrically insulated from the respective further connection element. [11] Electrical energy storage device (1) according to one of the preceding claims, characterized by that the respective dome (10, 11) is sealed against the respective line element (7) into which the respective dome (10, 11) is inserted, by means of a respective sealing element (42) formed separately from the respective line element (7) and separately from the respective dome (10, 11). [12] Electrical energy storage device (1) according to claim 11, characterized bythat at least the first of the sealing elements (42) are arranged in corresponding recesses (43) of the respective cell housings (4). [13] Electrical energy storage device (1) according to claim 12, characterized by that at least one respective component of the respective storage cell (2), which is formed separately from the respective cell housing (4) and arranged in the respective receiving space (5), is fixed to the respective cell housing (4) by the respective indentation (43). [14] Electrical energy storage device (1) according to claim 13, characterized by that the respective component comprises a respective contact element and / or a respective electrical heating element. [15] Motor vehicle, with at least one electrical energy storage device (1) according to one of the preceding claims. [16] Electrical energy storage device (1) for storing electrical energy for a motor vehicle, comprising a plurality of storage cells (2) designed to store the electrical energy, each of which has a cell housing (4) defining a receiving space (5) and a conducting element (7) through which a temperature control medium can flow and which penetrates the receiving space (5), and comprising a contacting device (9) designed separately from the storage cells (2), via which the storage cells (2) are electrically connected to one another, characterized by , that: - the respective line element (7) has a respective dome (10, 11) through which the temperature control medium can flow and which is inserted into a channel system of the contacting device (9) through which the temperature control medium can flow, wherein the temperature control medium can be introduced from the channel system of the contacting device (9) into the line elements (7) via the domes (10, 11) and / or can be discharged from the line elements (7) and introduced into the channel system of the contacting device (9), and - the storage cells (2) are held on a cell holder (12) which is formed separately from the storage cells (2) and separately from the contacting device (9) and at least limits relative movements between the storage cells (2), by means of which the domes (10, 11) are held in the line elements (7).

Images