DE102022118634A1 - Electrical energy storage for a motor vehicle and motor vehicle - Google Patents

Abstract

The invention relates to an electrical energy storage device (1) for storing electrical energy for a motor vehicle, with a plurality of storage cells (2) designed to store the electrical energy, which are formed separately from the storage cells (2) and have relative movements between the storage cells (2 ) at least limiting cell holder (10) are held, which has a first holding part (11) with a first base element (13) arranged on a first side (SE1) of the memory cells (2) and a second holder part (12) with a on one of the first side (SE1) facing away from the second side (SE2) of the memory cells (2), and with two separately formed, separately from the memory cells (2) and separately from the cell holder (10). housing parts (18, 19) screwed together by means of screw elements (20) arranged between the storage cells (2), between which the cell holder (10) and the storage cells (2) are arranged.

Description

The invention relates to an electrical energy storage device for a motor vehicle according to the preamble of patent claim 1. The invention further relates to a motor vehicle with at least one such energy storage device.

The EP 3 082 174 A1 discloses an energy storage device in which a plurality of energy storage cells are arranged in at least two packing levels between a first cell holder and a second cell holder of the respective packing level. At least one of the energy storage cells of one of the packing levels is electrically connected to a corresponding energy storage cell of at least one adjacent packing level to form a cell stack by means of at least one contact element, which is arranged between the cell holders of adjacent packing levels facing one another. The energy storage device has an end plate above and below the cell stacks. The first cell holders and the second cell holders of the at least two packing levels each have a plurality of continuous fastening recesses, with a tensile fastening means extending through the fastening recesses of these cell holders, by means of which at least the energy storage cells of the at least one cell stack are clamped together. It is provided that a tensile force of the fastening means is applied to the cell stack at least indirectly by means of the upper and/or lower end plate to which the fastening means are fixed.

The object of the present invention is to create an electrical energy storage for a motor vehicle and a motor vehicle with at least one such electrical energy storage, so that a particularly high rigidity of the electrical energy storage can be achieved in a particularly advantageous manner.

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

A first aspect of the invention relates to an electrical energy storage device, also referred to simply as a storage device, for storing, in particular electrochemically, electrical energy or electric current for a motor vehicle. Preferably, the electrical energy storage is designed as a battery, in particular as a secondary battery, so that the electrical energy can be stored or stored, in particular electrochemically, by means of the electrical energy storage. The motor vehicle, which is preferably designed as a motor vehicle, in particular as a passenger car, thus has the electrical energy storage in its completely manufactured state. Preferably, the electrical energy storage is 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 most preferably is several hundred volts. This makes it possible, for example, to realize particularly large electrical powers for, in particular, purely electrical driving of 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, in particular purely electrically. For this purpose, the electrical machine is supplied with the electrical energy stored in the electrical energy storage. The electrical 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 most preferably is several hundred volts.

The electrical energy storage, also simply referred to as energy storage, has a plurality of storage cells in or by means of which the electrical energy, in particular electrochemically, is to be stored or stored. The memory cells are also referred to as cells and are individual cells, i.e. components designed separately from one another. In particular, the respective storage cell is a battery cell, therefore a secondary cell. Expressed again in other words, it is preferably provided that the respective memory cell is designed as an accumulator or as an accumulator cell.

For example, the respective memory cell has a cell housing through which a receiving space of the respective memory cell can be limited, in particular directly. For example, a respective storage device for storing the electrical energy, in particular electrochemically, is arranged in the respective receiving space of the respective storage cell. The storage device comprises, for example, at least one electrode. In particular, the respective storage device can preferably have at least or exactly two electrodes. For example, a first of the electrodes has a first electrical polarity, for example the respective second electrode has a second electrical polarity that is different from the first electrical polarity and which is in particular opposite to the first electrical polarity. Thus, for example, one of the electrodes is designed as a cathode and the other electrode as an anode. Alternatively or additionally, the respective storage device can have a respective, in particular liquid, electrolyte, for example the electrode being in, in particular direct, contact with the electrolyte.

The electrical energy storage also has a cell holder which is designed separately from the storage cells and is also simply referred to as a holder or carrier, on which the storage cells are held, in particular directly, whereby relative movements between the storage cells are at least limited, in particular prevented. This means that the cell holder at least limits, in particular prevents, relative movements between the storage cells. In particular, the memory cells are held together or held together via the cell holder. This is to be understood in particular as meaning that the memory cells are held relative to one another by means of the cell holder in a pattern predetermined by the cell holder. In addition, it is particularly preferably provided that the memory 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 memory cells do not touch each other directly. The cell holder has a first holder part arranged on a first side of the memory cells. In addition, the cell holder has a second holder part, which is arranged on a second side of the memory cells facing away from the first side. In particular, the cell holders are designed separately from one another, for example.

For example, the respective memory cell, in particular its respective cell housing, has two end faces or end faces, the end faces or the end faces being spaced apart from one another along a spacing direction of the respective memory cell and lying opposite one another. Furthermore, it is conceivable, for example, for the respective cell housing to have a respective housing jacket, which extends, in particular along the spacing direction, for example between the end faces or end faces. In particular, it is conceivable that the end faces or end faces and the housing jacket limit the respective receiving space, in particular directly. It is conceivable that the memory cell is a cylindrical memory cell, therefore a round cell and is therefore cylindrical or round or circular on the outer circumference, so that, for example, the housing jacket, also known as a cell jacket, is cylindrical or round or circular on the outer circumference. Furthermore, it is conceivable that the respective memory cell can have any shape on the outer circumference, so that the respective memory cell can be designed, for example, prismatically on the outer circumference. In particular, it is conceivable that the spacing direction of the respective memory cell coincides with a respective longitudinal extension direction of the respective memory cell, which can extend elongated along its longitudinal extension direction. It is particularly conceivable that a first of the end faces or end faces is arranged on the first side and is therefore assigned to the first holder part, for example, with the second end face or end face being arranged on the second side and thus, for example, facing the second holder part. In particular, the holder parts are solid and very preferably inherently rigid.

The electrical energy storage further has two housing parts that are designed separately from one another, separately from the storage cells and separately from the cell holder, namely a first housing part and a second housing part. For example, the respective housing part is designed as a plate. In particular, the housing parts form an enclosure or the housing parts are components of an enclosure, the enclosure also being referred to as a housing or storage housing. For example, the enclosure delimits a receiving area, in particular directly, with the storage cells and the cell holder being arranged in the receiving area. The cell holders and the memory cells are arranged between the housing parts, particularly when viewed along the spacing direction. In particular, the housing parts are solid and, most preferably, inherently rigid. The housing parts are screwed together using screw elements, the screw elements being arranged between the storage cells. For example, the housing parts are indirectly clamped together by means of the screw elements and here in particular are clamped towards one another, in particular viewed along the spacing direction, so that, for example, a tensile force acts in the screw elements. For example, the housing parts are supported against one another, particularly when viewed along the spacing direction, through the support of the holder parts and through the storage cells, so that in particular because the housing parts are clamped together by means of the screw elements, the holder parts and the memory cells arranged between the holder parts, particularly when viewed along the spacing direction, are braced and in particular compressed along the spacing direction or are pressed together. Expressed again in other words, for example, because the housing parts are clamped together by means of the screw elements, the housing parts are clamped against the holder parts in particular along the spacing direction, as a result of which the holder parts are clamped against the memory cells in particular when viewed along the spacing direction.

The first holder part has a first base element which is arranged on the first side. The second holder part has a second base element which is arranged on the second side. For example, the respective memory cell is at least indirectly, in particular directly, supported on the first base element in a first supporting direction. For example, the respective memory cell is supported at least indirectly, in particular directly, on the second base element in a second support direction opposite to the first support direction. Thus, for example, the first base element is clamped in the second support direction against the memory cells by means of the first housing part, and for example, the second holder part is clamped in the first support direction against the memory cells by means of the second housing part. For example, the support directions run parallel to the spacing direction or coincide with the spacing direction.

In order to be able to realize a particularly high rigidity of the electrical energy storage in a particularly advantageous manner, it is provided according to the invention that respective column elements of the cell holder are assigned to the respective storage cell. The respective column elements of the cell holder assigned to the respective memory cell form a respective column element group, and since a plurality of memory cells are provided, a plurality of column element groups are provided. The respective column elements assigned to the respective storage cell and forming the respective column element group are arranged successively and spaced apart from one another in the circumferential direction of the respective storage cell to which the respective column elements of the respective column element group are assigned. When we talk about the column elements below, unless otherwise stated, this means the respective column elements of the respective column element group assigned to the respective memory cell. When we talk about the column element group below, unless otherwise stated, this is to be understood as meaning the respective column element group, which includes the respective column elements assigned to the respective memory cell or is formed by them.

A plurality of first of the respective column elements of the respective column element group each have a respective first column part, which points from the first base element in a first direction pointing from the first side and from the first base element to the second side, which corresponds, for example, to the second support direction stands out. The plurality of first column elements of the respective column element group each also have a respective second column part, which points in a second direction pointing from the second side and from the second base element to the first side and opposite to the first direction, which corresponds, for example, to the first support direction , protrudes from the second base element, is formed separately from the respective first column part of the respective first column element and adjoins the respective first column part of the respective first column element in the first direction. The respective column parts of the respective first column element are connected to one another, in particular directly. As a result, the holder parts, which are designed separately from one another, are connected to one another, particularly when viewed along the spacing direction, whereby a particularly high rigidity of the electrical energy storage can be achieved.

Furthermore, it is provided according to the invention that at least a second of the respective column elements of the respective column element group, in particular several second of the respective column elements of the respective column element group, has or have a third column part, which projects in the first direction from the first base element and also as a designated first through hole, has first through opening. Furthermore, the second column element of the respective column element group has a fourth column part, which projects in the second direction from the second base element, is formed separately from the third column part of the second column element, adjoins the third column part of the second column element in the first direction and has a second through opening which is aligned with the first through opening and is also referred to as a second through hole. Each of the screw elements, by means of which the housing parts are screwed together, penetrates the through openings. Since, as described above, several column element groups are provided, a total of several second column elements are also provided, so that several first through openings and several second through openings are provided. The respective, first through-opening and the respective, second through-opening form a pair of through-openings, which is penetrated by a respective one of the screw elements. The screw elements, by means of which the housing parts are screwed together, thus penetrate the respective through openings of the respective ones Pairs of through-openings, whereby a particularly high rigidity of the electrical energy storage can be achieved. In particular, the invention makes it possible to achieve a very high level of rigidity, in particular structural rigidity, of the electrical energy storage device without having to cast a material, for example a two-component adhesive material, around the storage cells. The invention is based in particular on the finding that, in conventional solutions, the memory cells are embedded in a mass designed, for example, as a two-component adhesive mass or polyurethane (PU), in particular PU foam, or foam in general, in particular by casting the mass around the memory cells become. The memory cells are glued together using the mass, and the memory cells are glued to the cell holder, in particular to the holder parts, by means of the mass. A disadvantage in this regard is that even if a fast-hardening two-component adhesive is used as the mass, in a method for producing the energy storage device it is necessary to wait for the mass, which is formed, for example, as a resin and is initially liquid, to harden, so that the method is at least stands still for a curing time during which the mass hardens. In addition, casting masses designed as adhesives, for example, is not environmentally friendly and cannot be recycled, since intermediate layers usually have to be used. In addition, manipulation of parts is usually required, this manipulation being carried out using expensive devices such as robots. Additionally, bulk can result in excessive weight. The invention makes it possible to dispense with the use of such a mass, so that a particularly space-, weight- and cost-effective design of the electrical energy storage can be achieved, with particularly high rigidity, in particular structural rigidity, of the electrical energy storage device being achieved particularly through the use of the screw elements and the column elements Energy storage can be represented. In particular, the screws can function like bones or struts of a skeleton, in particular in such a way that the housing parts are screwed together and thereby connected to one another by means of the screw elements arranged between the storage cells, in particular in areas arranged between the storage cells, whereby a particularly rigid structure can be represented. Compared to the materials mentioned above, screws, for example, are much more environmentally friendly, lighter in weight and recyclable. In addition, the electrical energy storage device according to the invention can be produced much more quickly and therefore more cost-effectively than using a mass with which the storage cells are cast, since there is no need to wait until such a mass has hardened.

In order to be able to keep the number of parts and thus the weight, the installation space requirement and the costs of the electrical energy storage within a particularly low range, it is provided in one embodiment of the invention that one of the housing parts has internal threads which are formed in one piece with one another and into which the threads are inserted separately from the Screw elements formed in the housing part are screwed in directly. The feature that the internal threads are formed in one piece with one another means that the internal threads are formed from a single piece, therefore are formed from a monoblock or are formed by a monoblock. Expressed again in other words, the one housing part has an integrally formed body, therefore formed from a single piece, which is thus formed as a monoblock or is formed by a monoblock, the integrally formed body forming the internal threads into which the screw elements are screwed . For example, the respective screw element has a respective external thread formed with the respective internal thread, the respective external thread being screwed directly into the respective internal thread. Expressed again in other words, for example, the respective internal thread is introduced directly into the one-piece body, in particular by means of a method such as flow drilling and tapping or thermal drilling.

Furthermore, it is conceivable that the respective internal thread is formed by a respective threaded body, such as a nut, which is formed separately from the one housing part, the threaded body being connected, in particular screwed, to the one housing part. It is conceivable that the threaded bodies forming the internal threads are designed separately from one another and are connected to one another and/or each to one housing part. Furthermore, it is possible for the threaded bodies to be formed in one piece with one another, that is to say to be formed from a single piece that is connected, in particular welded, to one housing part.

A further embodiment is characterized in that the respective screw element is supported via its respective screw head, also referred to as a screw head, on another housing part, in particular directly or indirectly, for example via a washer. This allows the housing parts to be screwed together in a way that is lightweight, space-saving and cost-effective.

In order to be able to connect the holder parts to one another particularly easily and firmly and thus to be able to produce the electrical energy storage particularly easily and cost-effectively, it is provided in a further embodiment of the invention that the third column part and the fourth column part are locked together, in particular directly.

In order to be able to keep the number of parts and thus the costs, the installation space requirement and the weight of the electrical energy storage within a particularly low range, it is provided in a further embodiment of the invention that the respective holder part is formed in one piece, i.e. from a single piece. In other words, the respective holder part is not formed from several parts that are formed separately and connected to one another and is therefore composed, but rather the holder part is formed from a single piece, therefore designed as a monoblock or formed by a monoblock.

In a further, particularly advantageous embodiment of the invention, it is provided that the fourth column part has a receptacle into which the third column part engages. In this way, for example, the third column part and the fourth column part can be supported or supported on one another, in particular in the form of an interlocking of the third column part with the fourth column part or vice versa, whereby a particularly high level of rigidity can be achieved.

In a further, particularly advantageous embodiment of the invention, the respective housing part is formed from a metallic material and/or from a fiber-reinforced, in particular carbon fiber-reinforced, plastic. In particular, for example, the housing parts are made from the same metallic material. This makes it possible to achieve a particularly high level of rigidity for the energy storage device. The internal threads for the screw elements can be incorporated into the respective housing part, for example designed as a plate, in particular into the plastic before the plastic or the plastic matrix hardens.

Finally, it has proven to be particularly advantageous if the respective screw element is sealed against at least one of the housing parts by means of a sealing element formed separately from the housing part and preferably also separately from the respective screw element. This makes it possible to create an advantageous screw connection, whereby a particularly high level of rigidity can be achieved. For example, the sealing element is made of rubber. For example, the respective screw element is made of a metallic material, in particular steel. Furthermore, it is conceivable that the respective screw element is designed as a self-sealing screw element. Furthermore, it is conceivable that the respective screw element is designed as a respective screw. For example, the sealing element is made of a plastic, in particular PTFE (polytetrafluoroethylene). For example, the sealing element can be designed as a sealing ring. For example, the sealing ring is a thread sealing ring.

• 1 eine schematische Explosionsansicht eines elektrischen Energiespeichers für ein Kraftfahrzeug;
• 2 ausschnittsweise eine schematische Draufsicht des Energiespeichers;
• 3 ausschnittsweise eine schematische Draufsicht eines Gehäuseteils des elektrischen Energiespeichers;
• 4 ausschnittsweise eine schematische Perspektivansicht des Energiespeichers;
• 5 ausschnittsweise eine weitere schematische Perspektivansicht des Energiespeichers;
• 6 ausschnittsweise eine weitere schematische Perspektivansicht des Energiespeichers;
• 7 eine schematische Perspektivansicht einer ersten Ausführungsform einer Baueinheit des elektrischen Energiespeichers;
• 8 eine schematische Perspektivansicht einer zweiten Ausführungsform der Baueinheit;
• 9 ausschnittsweise eine weitere schematische Perspektivansicht des elektrischen Energiespeichers;
• 10 ausschnittsweise eine schematische Schnittansicht des elektrischen Energiespeichers; und
• 11 ausschnittsweise eine weitere schematische Draufsicht des einen Gehäuseteils des elektrischen Energiespeichers.

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 refinements of the first aspect of the invention are to be viewed as advantages and advantageous refinements of the second aspect of the invention and vice versa. Further details of the invention result from the following description of preferred exemplary embodiments with the associated drawings. This shows:

• 1 a schematic exploded view of an electrical energy storage device for a motor vehicle;
• 2 a detail of a schematic top view of the energy storage device;
• 3 a detail of a schematic top view of a housing part of the electrical energy storage device;
• 4 a detail of a schematic perspective view of the energy storage device;
• 5 a detail of a further schematic perspective view of the energy storage device;
• 6 a detail of a further schematic perspective view of the energy storage device;
• 7 a schematic perspective view of a first embodiment of a structural unit of the electrical energy storage;
• 8th a schematic perspective view of a second embodiment of the structural unit;
• 9 a detail of a further schematic perspective view of the electrical energy storage;
• 10 a detail of a schematic sectional view of the electrical energy storage; and
• 11 a detail of a further schematic top view of one housing part of the electrical energy storage.

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

1 shows a schematic exploded view of an electrical energy storage device 1 for a motor vehicle. This means that the motor vehicle, which is preferably designed as a motor vehicle, in particular as a passenger car, has, in its fully manufactured state, the electrical energy storage 1, which is also simply referred to as a storage device. As will be explained in more detail below, electrical energy or electrical current, in particular electrochemically, can be stored in the energy storage 1 or by means of the energy storage 1, so that the electrical energy storage 1 is preferably a battery, in particular a secondary battery. In particular, the electrical energy storage 1 is a high-voltage battery, that is, a high-voltage storage (HV storage), the electrical voltage, in particular electrical operating or nominal voltage, is preferably greater than 50 volts, in particular greater than 60 volts, and preferably several is 100 volts. The energy storage 1 has a plurality of storage cells 2, which in the exemplary embodiment shown in the figures are designed as round cells and are therefore cylindrical on the outer circumference. However, the previous and following statements can also be easily transferred to those memory cells 2 which are not cylindrical on the outer circumference, and therefore have a shape different from a cylindrical shape on the outer circumference. The electrical energy can be stored, in particular electrochemically, in or by means of the memory cells 2, so that the respective memory cell 2 is preferably designed as a secondary cell. It can be seen that the memory cells 2 are components designed separately from one another and are therefore individual cells.

The respective memory cell 2 has a respective, in 1 by a double arrow 3, which is a longitudinal extension direction in the exemplary embodiment shown in the figures, so that the respective memory cell 2 has a longitudinal extension running along the longitudinal extension direction. The respective memory cell 2 has a respective, first end face S1 and a respective, second end face S2, with the end faces S1 and S2 of the respective memory cell 2 facing away from one another along the spacing direction, that is to say in the longitudinal extension direction, of the respective memory cell 2 and thereby on respective ones , in particular free, ends of the respective memory cell 2 are arranged. For example, the respective memory cell 2 has two electrode connections, namely a first electrode connection and a second electrode connection. The electrode connections are also referred to as electrical connection elements, connections or terminals. For example, the electrode connections are also referred to as contact areas or the electrode connections are contact areas of the respective memory cell 2. In other words, the electrode connections are contact areas, which are also referred to as connection areas, or the electrode connections are also referred to as contact areas or connection areas.

The electrical energy storage 1 has, for example, a contacting device, not shown in the figures, which is electrically contacted or connected to the respective contact areas of the respective storage cell 2, in particular directly, whereby the storage cells 2 are electrically connected to one another via the contacting device and thereby, for example, in series or are connected in parallel to each other. For example, a first of the respective electrode connections or contact areas of the respective memory cell 2 is a first electrical pole of the respective memory cell 2 or the respective first electrode connection or contact area forms a first electrical pole of the respective memory cell 2. The respective second electrode connection or contact area of the respective memory cell 2 is or forms, for example, a second electrical pole of the respective memory cell 2, wherein the first electrical pole has a first electrical polarity and the respective second electrical pole has a second electrical polarity that is different from the first polarity and in particular opposite to the first electrical polarity. For example, the first electrical pole is an electrical positive pole of the respective memory cell 2, so that the respective first contact area or electrode connection is also referred to, for example, as a cathode connection or cathode. For example, the respective second electrical pole is a respective second electrical negative pole of the respective memory cell 2, so that the respective second electrode connection or contact area of the respective memory cell 2 is also referred to as an anode connection or anode. It is conceivable that the two contact areas of the respective memory cell 2 are arranged on the same end face S1 and/or S2 of the respective memory cell 2.

The respective memory cell 2 has a respective cell housing 4, through which it looks particularly good 10 can be seen, a respective recording space 5 of the respective memory cell 2 is limited, in particular directly. For example, the respective cell housing 4, which can include the end faces S1 and S2 or end faces forming the respective end faces S1 and S2, a respective housing jacket 6, which extends, for example, along the respective spacing direction of the respective memory cell 2 at least between the end faces S1 and S2. For example, the receiving space 5, also referred to as the interior of the respective memory cell 2, is also partially and in particular directly delimited by the housing jacket 6. For example, a respective storage device 7 of the respective storage cell 2 is arranged in the receiving space 5, wherein the electrical energy can be stored, in particular electrochemically, by means of the respective storage device.

Particularly good looking 10 It can be seen that the respective storage cell 2 also has a respective line element 8 through which a temperature control medium can flow, that is to say for cooling and/or heating the respective storage cell 2, which has a channel 9 through which the preferably liquid temperature control medium can flow, in particular directly delimited . The line element 8 penetrates or passes through the respective receiving space 5 of the respective storage cell 2 and also the end faces S1 and S2 or the end faces, so that the preferably liquid temperature control medium comes from outside the respective storage cell 2 and thus from a respective environment of the respective storage cell 2 itself Taken alone, this means that it can be introduced into the line element 8, i.e. into the channel 9. The temperature control medium can then flow through the line element 8, thus the channel 9, and the temperature control medium can then be removed from the respective line element 8 and thus, for example, be guided to the respective surroundings of the memory cell 2 itself. In this way, a particularly effective and efficient temperature control, i.e. heating and/or cooling, of the respective storage cell 2 can be realized, in particular in the manner of immersion cooling, without actually having to implement such immersion cooling and having to accept the disadvantages of immersion cooling. However, the previous and following statements can also be easily transferred to those memory cells 2 which are not cylindrical on the outer circumference, and therefore have a shape different from a cylindrical shape on the outer circumference. Immersion cooling is to be understood in particular as meaning that during operation of the electrical energy storage device 1, the temperature control medium flows directly to and around the storage cells 2, whereby an effective and efficient heat exchange can take place between the temperature control medium and the respective storage cell 2. However, the disadvantages of such immersion cooling can be that it can lead to undesirable leaks and undesirable corrosion effects. Undesirable corrosion effects can occur in particular because the temperature control agent designed as a liquid can creep into the crimped area due to capillary effects or can come into contact with the open material. These disadvantages can now be avoided with the energy storage device 1. At the same time, effective and efficient temperature control of the storage cells 2 can be ensured, since an effective and efficient heat exchange between the respective storage cell 2 and the temperature control medium flowing through the respective line element 8 can be guaranteed via the respective line element 8.

Particularly good looking 1 It can be seen that the electrical energy storage 1 has a cell holder 10 which is designed separately from the storage cells 2 and is also referred to as a holder or carrier. The memory cells 2 are held at least indirectly, in particular directly, on the cell holder 10, whereby the cell holder 10 at least limits, in particular prevents, relative movements between the memory cells 2. The cell holder 10 has at least or exactly two holder parts 11 and 12. The holder part 11 and/or the holder part 12 are preferably formed in one piece, and are therefore formed from a single piece. For example, the holder part 11 and/or the holder part 12 is formed from a plastic, in particular from a heat-conducting plastic. For example, the holder part 11 and/or the holder part 12 is produced by injection molding, in particular by plastic injection molding. In principle, it is conceivable that the holder parts 11 and 12 are identical, that is to say structurally identical, whereby the holder parts 11 and 12 can be produced, for example, by means of the same or by means of the same tool, in particular by means of the same or by means of the same injection molding tool. As a result, the cell holder 10 can be manufactured particularly cost-effectively. It can be seen that the holder parts 11 and 12 are components that are designed separately from one another and are connected to one another, in particular in a non-destructively detachable manner. In the present case, the holder parts 11 and 12, as will be explained in more detail below, are locked together and thus clipped together, that is, connected to one another in a form-fitting manner. Furthermore, the memory cells 2 are held at a respective distance from one another by means of the cell holder 10, and the memory cells 2 are arranged in one by means of the cell holder 10 1 particularly easily recognizable patterns are kept relative to one another. In the exemplary embodiment shown, a non-destructive release or separation of the holder parts 11 and 12 is not necessarily provided, but is in principle conceivable.

The first holder part 11 has a first base element 13 arranged on a first side SE1 of the memory cells 2, and the second holder part 12 has a second base element 14 arranged on a second side SE2 of the memory cells 2. It can be seen that the sides SE1 and SE2 point away from one another along the respective spacing direction of the respective memory cell 2 and lie opposite one another. The respective end face S1 is arranged on the first side SE1 and thus faces the first base element 13, and the respective end face S2 is arranged on the second side SE2 and is thus assigned to the second base element 14. The memory cells 2 are at least indirectly supported in a first support direction illustrated by an arrow 15 and are supported on the base element 13, for example via an insulator or an insulator layer and/or a contacting device, in particular directly. In addition, the memory cells 2 are at least indirectly supported in a second support direction illustrated by an arrow 16 and are supported on the base element 14, for example via an insulator or an insulator layer and/or a contacting device, in particular directly. Based on the arrows 15 and 16 it can be seen that the second support direction is opposite to the first support direction or vice versa. In addition, the respective support direction runs parallel to the spacing direction. In particular, it is conceivable that the memory cells are electrically connected to one another via the contacting device mentioned.

The energy storage 1 also has an enclosure 17, also referred to as a housing or storage housing, which at least partially and preferably directly delimits a receiving area 21. The memory cells 2 and the cell holder 10, therefore the holder parts 11 and 12, are arranged in the receiving area 21. The housing 17 has at least or exactly two housing parts formed separately from one another, separately from the cell holder 10 and separately from the memory cells 2, namely a first housing part 18 and a second housing part 19. For example, the housing parts 18 and 19 are formed from a metallic material. In the exemplary embodiment shown in the figures, the respective housing part 18, 19 is designed as a plate, in particular as an end plate. It can be seen that the housing part 18 is arranged on the first side SE1 of the memory cells 2, and the housing part 19 is arranged on the second side SE2 of the memory cells 2. Thus, the holder parts 11 and 12 and the memory cells 2 are arranged between the housing parts 18 and 19, viewed along the respective spacing direction. The respective plate can be a section from the underside of a tub or from a flat area of a lid, in particular an inverted or convex tub.

The energy storage device 1 also comprises screw elements 20 designed as screws, by means of which the housing parts 18 and 19 are screwed together and thereby clamped together. The screw elements 20 are arranged between the storage cells 2, in particular in relation to a plane which runs perpendicular to the respective spacing direction. This is to be understood in particular as meaning that, in particular in the plane mentioned, areas are arranged between the memory cells 2, through which the screw elements 20 extend, in particular in the axial direction of the respective screw element 20. The respective axial direction of the respective screw element 20 runs parallel to the spacing direction or coincides with the spacing direction of the respective memory cell 2.

In particular, the housing parts 18 and 19 are screwed together by means of the screw elements 20 and are thereby clamped together in such a way that a tensile force acts in the respective screw element 20. By means of the respective tensile force, the housing parts 18 and 19 are clamped towards one another, so that the base element 13 is tensioned in the second support direction (arrow 16) against the storage cells 2 by means of the housing part 18, and so that the base element 14 is clamped in the first support direction (arrow 16) by means of the housing part 19. Arrow 15) is tensioned against the memory cells 2. This ensures that the holder parts 11 and 12 and the memory cells 2 as well as the housing parts 18 and 19 hold together particularly firmly. The holder parts 11 and 12 and also the housing parts 18 and 19 are each inherently rigid and designed as solid bodies.

In order to be able to realize a particularly high rigidity of the electrical energy storage device 1 in a particularly simple manner, it is particularly good to look at it in conjunction with 2 can be seen, the respective memory cell 2 is assigned respective column elements 22 of the cell holder 10, the respective column elements 22 assigned to the respective memory cell 2 form a respective column element group 23 and in the circumferential direction of the respective memory cell 2 extending around the respective spacing direction of the respective memory cell 2, the respective Column elements 22 are assigned to the respective column element group 23, are arranged successively and spaced apart from one another. The respective circumferential direction of the respective memory cell 2 is in 2 using the example of one of the memory cells 2 illustrated by a double arrow 24. In particular, the circumferential direction runs in the aforementioned plane.

In 2 are several, first of the column elements 22 of the column element group 23 with 25 designated. As if from a synopsis of 1 and 2 can be seen, the respective first column element 25 of the respective column element group 23 each has a respective first column part 26, which points from the first side SE1 and from the first base element 13 to the second side SE2, illustrated by the arrow 16, first direction, which therefore corresponds to the second support direction, protrudes from the first base element 13. Furthermore, the respective, first column element 25 of the respective column element group 23 has a respective, second column part 27, which points in a direction from the second side SE2 and from the second base element 14 to the first side SE1, opposite the first direction, indicated by the arrow 15 illustrated, second direction, which corresponds to the first support direction, protrudes from the second base element 14 and is formed separately from the respective first column part 26 of the respective first column element 25 and extends in the first direction to the respective first column part 26 of the respective , first column element 25 connects. The respective column parts 26 and 27 of the respective first column element 25 of the respective column element group 23 are formed separately from one another and connected to one another. For this purpose, the respective column part 26, 27 of the respective first column element 25 has at least one respective connecting element 28, 29, which in the present case is designed as a latching element. By means of the connecting elements 28 and 29, the column parts 26 and 27 of the respective first column element 25 are locked together and thereby connected to one another, in particular in a non-destructive manner. In the present case, for example, it is provided that the column parts 26 and 27 are connected to one another in a non-destructively detachable manner by means of the connecting elements 28 and 29. A non-destructively detachable connection is conceivable.

In the present case, the column parts 26 and 27 are captively connected to one another, in particular locked, by means of the connecting elements 28 and 29. “Captive” can mean a non-destructive or destructive connection.

In 2 second of the respective column elements 22 of the respective column element group 23 are designated 30. The respective, second column element 30 of the respective column element group 23 has a respective, third column part 31, which projects in the first direction from the first base element 13 and has a respective, first through opening. The respective, second column element 30 of the respective column element group 23 has a respective, fourth column part 32, which projects in the second direction from the second base element 14 and is formed separately from the respective, third column part 31 of the respective, second column element 30 and is located in the first direction connects to the respective third column part 31 of the respective second column element 30 and has a second through opening 33 aligned with the respective first through opening. The respective second through opening is particularly good 10 can be seen, in which the respective first through opening 34, designated 34, can also be seen. Particularly good looking 10 It can also be seen that each of the screw elements 20, by means of which the housing parts 18 and 19 are screwed together, penetrates the respective, aligned through openings 33 and 34 of the respective, second column element 30. In relation to the electrical energy storage device 1 as a whole, it is thus provided that the respective screw elements 20 penetrate the respective, aligned through openings 33 and 34 of the respective, second column elements 30 of the respective column element groups 23. In this way, a particularly high rigidity, in particular structural rigidity, of the electrical energy storage 1 can be guaranteed.

Furthermore is over 10 It can be seen that the housing part 18 has a body 35 which is designed in one piece and is therefore formed from a single piece and which forms respective internal threads 36. The internal threads 36 are therefore formed in one piece with one another. In particular, for example, the body 35 can be the first housing part 18 itself, so that the first housing part 18 can be formed in one piece and can form the internal thread 36. The respective screw element 20 has a respective external thread 37 corresponding to the respective internal thread 36, which is screwed directly into the respective corresponding internal thread 36. In addition, for example, the respective screw element 20 penetrates a respective, corresponding and preferably thread-free through opening 51 of the housing part 19. The respective screw element 20 has a respective screw head 38, via which the respective screw element 20 is attached to the housing part at least indirectly, in particular directly, along its axial direction 19 is supported. As a result, the housing parts 18 and 19 can be clamped together in a particularly simple and space-saving, cost-effective and weight-efficient manner. For example, the respective screw head 38 has a respective tool attack 39, which can be designed, for example, as a non-round or polygonal, in particular as an internally non-round or internal polygon such as an internal square or an internal hexagon. By means of the tool attack 39, a screwing tool can be connected to the respective screwing element 20 in a torque-transmitting, in particular rotationally fixed, manner, thereby using the screwing tool the respective screw element 20 is rotated relative to the housing parts 18 and 19 and can thereby be screwed into the respective internal thread 36.

For example, the respective fourth column part 32 has a respective receptacle 40 ( 1 ), into which, for example, the respective, corresponding, third column part 31 engages, in particular directly. Furthermore is over 10 It can be seen that, for example, the housing part 19 has a recess 41, in particular designed as an indentation, in which the respective screw element 20, in particular the respective screw head 38, is at least partially accommodated.

The housing parts 18 and 19 and the holder parts 11 and 12 arranged between them as well as the memory cells 2 arranged between them form a sandwich structure, of which, for example, the housing parts 18 and 19 form cover layers and the memory cells 2 and the cell holder 10 form a core layer arranged between the cover layers, which also simply referred to as the core. As a result, a particularly high level of rigidity, in particular structural rigidity, of the energy storage device 1 can be achieved in a way that is economical in terms of installation space and weight. For example, the housing part 18 is a top plate, which can be a base plate of a self-supporting body of the motor vehicle when the motor vehicle is fully manufactured. For example, the interior of the motor vehicle is at least partially limited downwards in the vertical direction of the vehicle by the floor plate. For example, the housing part 19 is a lower plate, which can be a housing cover of the housing 17, for example. Thus, in particular, the housing part 18 is part of a supporting structure of the body of the motor vehicle.

In 3 It can be seen that in principle all internal threads 36 and all through openings 51, also referred to as holes, in the housing parts 18 and 19 can be used to screw the housing parts 18 and 19 together. In particular is off 3 However, it can be seen that not all of the internal threads 36 and not all of the through openings 51 have to be used in order to screw the housing parts 18 and 19 together. There are in 3 Pattern illustrates in or according to which the screw elements 20, by means of which the housing parts 18 and 19 are screwed together, can be arranged. In 3 a first of the patterns is designated 42, the first pattern 42 being hexagonal. A second of the patterns is designated 43, the second pattern 42 being triangular. In other words, pattern 42 is a hexagon, pattern 43 is a triangle. A third of the patterns is designated 44, the third pattern 44 being hexagonal and extending in particular over two rows of cells. Patterns 42 and 43 only extend over exactly one row of cells. A fourth of the patterns is designated 45, the fourth pattern 45 being triangular and extending over, in particular exactly, three rows of cells. It is conceivable that one of the patterns is rectangular or parallelogram-shaped.

Recognizable 3 are also the recesses 41 designed as knobs or depressions in order to be able to realize advantageous aerodynamics and advantageous acoustics. In addition, the housing part 19, which is made of sheet metal, for example, is stiffened by the knobs. The housing part 18 is preferably made of sheet metal. In particular is off 3 It can be seen that the screw connection of the housing parts 18 and 19 to one another can be designed in any way, in particular in that all internal threads 36 and all through openings 51 or not all internal threads 36 and not all through openings 51 are used to screw the housing parts 18 and 19 together .

According to 4 until 6 For example, all internal threads 36 and all through openings 51 and consequently all second column elements 30 are used to screw the housing parts 18 and 19 together. This is also in 7 the case. In 6 and 7 The theoretical maximum number of screw connections is shown, where in 6 Of the housing parts 18 and 19, which are presently designed as plates, only one of the housing parts 18 and 19, namely the housing part 19, and only the screw elements 20, which are presently designed as screws, are shown. In addition, there are 7 the memory cells 2 are also shown. If this maximum number of screw elements 20 is provided, whereby the number of screw elements 20 corresponds or can correspond to the number of column elements 22, then, for example, the or all column elements 22 are designed as the column elements 30, which are penetrated by the screw elements 20. The first column elements 25 would then not be provided.

8th shows an embodiment in which not all internal threads 36 and therefore not all through openings 51 and not all second column elements 30 are used to screw together the housing parts 18 and 19, so that some of the through openings 51, some of the internal threads 36 and some of the second column elements 30 are free of screw elements and are therefore not penetrated by screw elements.

Out of 10 It can be seen that, for example, the respective screw element 20 is secured against that by means of a respective sealing element 46 Housing part 18 is sealed, in particular in that the sealing element 46 rests directly on the housing part 19 on the one hand and directly on the respective screw element 20 on the other hand. The sealing element 46 is formed separately from the housing parts 18 and 19 and separately from the respective screw element 20. For example, the respective sealing element 46 is made of a plastic such as PTFE. In particular, the sealing element 46 can be a sealing ring. Alternatively or additionally, it is conceivable to seal the respective screw element 20 against the housing part 18 by means of a respective sealing element 47. In particular, it is conceivable that the sealing element 47 is arranged in the internal thread 36 or between the internal thread 36 and the respective screw element 20. For example, the sealing element 47 can be a sealing ring, in particular a thread sealing ring. Furthermore, it is conceivable that the respective screw element 20 is designed as a self-sealing screw.

In 11 Further patterns 48, 49, 50, 52, 53 and 54 are illustrated, according to or in which the screw elements 20 can be arranged. It can be seen that the pattern 48 is, for example, hexagonal, the pattern 49 is triangular, the pattern 50 is rectangular, in particular square, the pattern 52 is parallelogram-shaped, the pattern 53 is triangular, but larger than the pattern 49, and the pattern 54 is hexagonal, but larger than since pattern is 48.

Reference symbol list

1

electrical energy storage

2

Memory cells

3

Double arrow

4

Cell casing

5

Recording room

6

Housing jacket

7

Storage facility

8th

Line element

9

channel

10

Cell holder

11

first holder part

12

second holder part

13

first basic element

14

second basic element

15

Arrow

16

Arrow

17

Enclosure

18

first housing part

19

second housing part

20

screw element

21

Recording area

22

Column elements

23

Column element group

24

Double arrow

25

first column element

26

first column part

27

second column part

28

connecting element

29

connecting element

30

second column element

31

third column part

32

fourth column part

33

second passage opening

34

first passage opening

35

Body

36

inner thread

37

external thread/

38

screw head

39

Tool attack

40

Recording

41

recess

42

Pattern

43

Pattern

44

Pattern

45

Pattern

46

Sealing element

47

Sealing element

48

Pattern

49

Pattern

50

Pattern

51

Passage opening

52

Pattern

53

Pattern

54

Pattern

S1

front side

S2

front side

SE1

first page

SE2

second page

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 3082174 A1 [0002]

Claims (10)

Electrical energy storage (1) for storing electrical energy for a motor vehicle, with a plurality of storage cells (2) designed to store the electrical energy, which are attached to a cell holder which is designed separately from the storage cells (2) and at least limits relative movements between the storage cells (2). (10) are held, which has a first holding part (11) with a first base element (13) arranged on a first side (SE1) of the memory cells (2) and a second holder part (12) with a on one of the first side ( SE1) facing away from the second side (SE2) of the memory cells (2), and with two separately formed, separately from the memory cells (2) and separately from the cell holder (10) and by means between the memory cells (2) arranged screw elements (20) screwed together housing parts (18, 19), between which the cell holder (10) and the storage cells (2) are arranged, characterized in that the respective storage cell (2) has respective column elements (22) of the cell holder (10) are assigned, the respective column elements (22) assigned to the respective storage cell (2) form a respective column element group (23) and in the circumferential direction (24) of the respective storage cell (2), the respective column elements (22) of the respective column element group (23) are assigned, are arranged sequentially and spaced apart from one another, wherein: - first of the respective column elements (22, 25) of the respective column element group (23) each have: ◯ a respective first column part (26), which is in one of the first Side (SE1) and from the first base element (13) to the second side (SE2), the first direction (16) protrudes from the first base element (13), and ◯ a respective second column part (27), which is in one of the second side (SE2) and from the second base element (14) to the first side (SE1), the second direction (15), which points opposite the first direction (16), projects from the second base element (14), separately from the respective, first column part (26) of the respective first column element (25) is formed and adjoins the respective first column part (26) of the respective first column element (25) in the first direction (16), the respective column parts (26, 27) of the respective first column element (25) are connected to one another, and - at least a second of the respective column elements (22, 30) of the respective column element group (23) has: ◯ a third column part (31), which in the first direction (16 ) protrudes from the first base element (13) and has a first through opening (34), and ◯ a fourth column part (32), which protrudes in the second direction (15) from the second base element (14), separately from the third column part ( 31) of the second column element (30) is formed, adjoins the third column part (31) of the second column element (30) in the first direction (16) and has a second through opening (33) aligned with the first through opening (34). , wherein each of the screw elements (20), by means of which the housing parts (18, 19() are screwed together, penetrates the through openings (33, 34). Electrical energy storage (1) according to Claim 1 , characterized in that one of the housing parts (18, 19) has internal threads (36) formed in one piece with one another, into which the screw elements (20) formed separately from the housing parts (18, 19) are screwed directly. Electrical energy storage (1) according to Claim 2 , characterized in that the respective screw element (20) is at least indirectly supported on the other housing part (19, 18) via its respective screw head (38). Electrical energy storage (1) according to one of the preceding claims, characterized in that the third column part (31) and the fourth column part (32) of the second column element (30) are locked together. Electrical energy storage (1) according to one of the preceding claims, characterized in that the respective holder part (11, 12) is formed in one piece. Electrical energy storage (1) according to one of the preceding claims, characterized in that the fourth column part (32) has a receptacle (40) into which the third column part (31) engages. Electrical energy storage (1) according to one of the preceding claims, characterized in that the respective holder part (11, 12) is made of a plastic. Electrical energy storage (1) according to one of the preceding claims, characterized in that the respective housing part (18, 19) is formed from a metallic material and/or from a fiber-reinforced plastic. Electrical energy storage (1) according to one of the preceding claims, characterized in that the respective screw element (20) is against at least one of the housing parts (18, 19). is sealed by means of a sealing element (46, 47) formed separately from the housing parts (18, 19). Motor vehicle, with at least one electrical energy storage (1) according to one of the preceding claims.

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