Energy storage device for a motor vehicle, motor vehicle and method for replacing a cylindrical cell of an energy storage device

Abstract

The invention relates to an energy storage device (10) for a motor vehicle, comprising a receiving space (12), several cylindrical cells (14; 14', 14a, 14b, 14") received in the receiving space (12), and a holding device (18) for holding the cylindrical cells (14; 14', 14a, 14b, 14"), wherein the holding device (18) comprises a holding element (18a) for each cylindrical cell (14; 14', 14a, 14b, 14"), which has an opening (20) into which the respective cylindrical cell (14; 14', 14a, 14b, 14") is inserted. Each retaining element (18a) comprises a cylindrical wall (22) which encloses an interior space in the radial direction and which has a distance (d) in the radial direction from the round cell (14; 14', 14a, 14b, 14") received in the opening (20), and several longitudinal webs (30) arranged inside the wall (22) and distributed in the circumferential direction (U) and projecting radially inwards.

Description

[0001] The invention relates to an energy storage device for a motor vehicle, comprising a receiving space, several cylindrical cells received in the receiving space, and a holding device for holding the cylindrical cells, wherein the holding device for each cylindrical cell includes a holding element having an opening into which the respective cylindrical cell is inserted. The invention further relates to a motor vehicle and a method for replacing a cylindrical cell.

[0002] Modern cylindrical cell designs, especially in automotive batteries such as high-voltage batteries, are often bonded together. This bonding means that if individual cells fail, the entire module must be replaced. The cooling system for the cylindrical cells is often implemented as a meandering aluminum profile between the cells, which is also bonded to them. Replacing individual modules results in a significantly high cost for each vehicle.

[0003] DE 10 2014 002 165 B3 describes a method for fixing cells to produce a cell block, wherein the cells are inserted into openings of a first cell carrier, inserted into openings of a second cell carrier, positioned in openings of a cell fixation device such that the cell fixation device is located between the two cell carriers, and the cell fixation device is compressed by means of the two cell carriers. The cell fixation device can be provided by a foam or a foam mat. After compression, the cell carriers are also connected to each other, in particular by screwing, welding, riveting, gluing, or clipping.

[0004] However, embedding cell areas in a compressed foam mat limits the cooling possibility and cooling efficiency.

[0005] Furthermore, DE 10 2017 009 385 A1 describes an energy storage device with round storage cells and a holder that has several first receptacles in which the first storage cells are arranged, and several second receptacles arranged offset from the first receptacles, in which the second storage cells are arranged offset from the first storage cells, wherein direct cooling is provided by means of which the storage cells can be supplied with a cooling fluid. Nevertheless, the aim to provide an energy storage device with the most efficient cooling option and the simplest possible exchange of battery cells remains.

[0006] The object of the present invention is therefore to provide an energy storage device, a motor vehicle and a method that enable the most efficient possible mounting of cylindrical cells and at the same time the most efficient possible cooling.

[0007] The problem is solved by an energy storage device, a motor vehicle, and a method with the features according to the respective independent patent claims. Advantageous embodiments of the invention are the subject of the dependent patent claims, the description, and the figures.

[0008] An energy storage device according to the invention for a motor vehicle comprises a receiving space, several cylindrical cells received in the receiving space, and a holding device for holding the cylindrical cells, wherein the holding device for each cylindrical cell comprises a holding element having an opening into which the respective cylindrical cell is inserted. Furthermore, each holding element comprises a cylindrical wall that encloses an interior space in the radial direction and that is spaced radially away from the cylindrical cell received in the opening, and wherein the respective holding element comprises several longitudinal webs arranged on the inside of the wall and distributed circumferentially and projecting radially inwards.

[0009] The longitudinal ribs advantageously hold the cylindrical cells in position within the openings, particularly without the need for adhesives. Furthermore, these ribs advantageously create spaces between the cylindrical wall and the cylindrical cells, which can be used for heat dissipation and, in particular, through which a coolant can flow. The cylindrical cells can be easily inserted into the opening and, for example, in the event of repairs, just as easily removed from the openings of the respective retaining elements, especially each cylindrical cell individually and independently of the others. This provides a particularly convenient replacement or repair option for the cylindrical cells. This design thus advantageously allows the cylindrical cells to be permanently mounted without the need for adhesives or similar materials.The elimination of adhesive allows for the replacement of individual cells, significantly reducing repair costs. This provides an effective and cost-efficient repair solution for cylindrical energy storage systems, which can also be combined with an advantageous cooling option for the cells. This is because the presence of ribs leaves a large portion of the cylindrical cell's surface exposed, allowing for particularly efficient cooling.

[0010] The wall of each retaining element can be, for example, completely closed, or have a grid-like structure or similar design. In other words, the wall can also include openings and / or penetrations. The same applies to the inwardly projecting longitudinal webs. These, too, can be, for example, solid or closed, or optionally feature penetrations, openings, or similar features in the circumferential direction.

[0011] Furthermore, it is preferred that the longitudinal ribs project inwards far enough to contact the outer surface of the respective cylindrical cell held in the retaining element. This provides a particularly efficient holding mechanism for the cylindrical cells. The inwardly projecting end faces of the longitudinal ribs can thus be in direct contact with the cylindrical cells. It is also highly advantageous if each retaining element comprises, for example, at least three such longitudinal ribs or more than three. This allows for particularly secure radial fixation of the cylindrical cells within the respective retaining element. The longitudinal ribs can, for example, be arranged evenly distributed around the circumference.

[0012] The holding device or holding elements can be made of a metallic material, such as aluminum, or preferably of plastic. A plastic construction, in particular, allows for a certain degree of flexibility, making it especially easy to compensate for tolerances between the cells and the holding device.

[0013] A cylindrical cell is understood to be, in particular, a battery cell that has a substantially cylindrical geometry. Such a cylindrical cell may, for example, have a longitudinal axis and two end faces that define the cell on both sides with respect to this longitudinal axis. The cell poles of each cylindrical cell may also be located on these end faces. Both cell poles may be located on the same end face of the cylindrical cell or on opposite end faces. Furthermore, cylindrical cells can be lithium-ion cells.

[0014] The energy storage unit's housing can be provided, for example, by the interior of a battery casing. For cooling purposes, the entire housing can optionally be flooded or permeated by a coolant. To cool the cylindrical cells, their outer surfaces can be brought into direct contact with the coolant, particularly a liquid coolant. In this case, the use of an electrically non-conductive coolant, such as a cooling oil or similar substance, is highly advantageous. Generally speaking, a dielectric coolant, for example, can be used.

[0015] According to a further advantageous embodiment of the invention, the cylindrical cells are held in the respective interior spaces of the retaining elements by means of the longitudinal webs through clamping and / or frictional engagement. This allows the cylindrical cells to be reliably held in position and, if necessary, removed from the retaining elements with particular ease. In particular, the cylindrical cells should not be permanently bonded to the retaining elements, for example, by being glued or welded to them, or similar means.

[0016] According to a further advantageous embodiment of the invention, several cooling channels, separated by the longitudinal webs and through which a coolant, in particular a liquid coolant, can flow, are formed in the interior of a respective holding element between the cylindrical cell received in the holding element and the wall.

[0017] Because the wall is spaced away from the cylindrical cells, advantageously, gaps are formed between each cylindrical cell's outer surface and the spaced-away wall, which can be used for the flow of a coolant. Since the wall is spaced away from the cells by the longitudinal webs, correspondingly advantageous gaps for flow can be provided between the cell and the wall. The energy storage device is designed such that, during operation, and especially during operation of a cooling device for cooling the cylindrical cells, it is permeated by the coolant, particularly the liquid coolant. The coolant can thus flow through the cooling channels in the axial direction relative to the cell axes of the cylindrical cells.

[0018] According to a further advantageous embodiment of the invention, the energy storage device comprises a coolant supply port and a coolant discharge port, each opening into the receiving chamber. Thus, a coolant can advantageously be introduced directly into the receiving chamber via the supply port, flow through the aforementioned cooling channels, and thereby flow directly past the outer surfaces of the respective cylindrical cells, and then discharged from the receiving chamber via the coolant discharge port. As it flows through the receiving chamber, the coolant comes into direct contact at least with the outer surfaces of the battery cells, i.e., the cylindrical cells, or can even flow completely around the battery cells, including their terminals and cell connectors. This enables particularly efficient cooling of the cylindrical cells.

[0019] According to a further advantageous embodiment of the invention, the retaining elements are attached to one another. In principle, it is also conceivable that the retaining elements can be positioned or are positioned loosely relative to one another. However, attaching the retaining elements to one another increases the stability and strength of the overall arrangement. Furthermore, this also simplifies the manufacture of the retaining device and the assembly of the energy storage unit. The individual retaining elements of the retaining device can, for example, be arranged in rows and columns relative to one another. The arrangement of the retaining elements in two adjacent rows can also be offset from one another, for example by half a width or the radius of a retaining element. This allows for a hexagonal structure, also known as a honeycomb structure. This enables a particularly dense arrangement of the cylindrical cells relative to one another. However, other arrangements are also possible.

[0020] According to a further advantageous embodiment of the invention, each holding element has a base with a central through-opening that faces a releasable cell venting opening of the respective cylindrical cell. The base of each holding element can, for example, be formed by an annular base flange projecting radially inwards. The through-opening in the base can have a minimum diameter smaller than the diameter of the respective cylindrical cell. This allows the cylindrical cell to be held in the holding element by means of the base. The central through-opening also advantageously provides a venting option in the event of thermal runaway of the cylindrical cell. The gas then escaping from the cylindrical cell's released venting opening can thus escape much more easily through this through-opening. This facilitates simpler gas removal.

[0021] According to a further advantageous embodiment of the invention, the cylindrical cells comprise a first cylindrical cell and a second cylindrical cell, each of which includes a first cell pole at end faces pointing in the same first direction, wherein these cell poles are electrically contacted via a first cell connector. The contacting, especially of adjacent cylindrical cells, is particularly simple when this is done via poles at end faces pointing in the same first direction.

[0022] According to a further advantageous embodiment of the invention, the cylindrical cells comprise a third cylindrical cell, wherein the first and third cylindrical cells each have a second cell pole on end faces pointing in the same direction, and the second cell poles are electrically connected via a second cell connector. Thus, both cell poles of each cylindrical cell can be located on the same end face. This allows for particularly simple contact between the cylindrical cells. Furthermore, this also provides a particularly advantageous repair and replacement option, as will be explained in more detail later.This makes it easy to replace one of the cylindrical cells, for example, the first one. The cell connectors attached to it can be cut, the cylindrical cell, including the remaining connector sections, removed from the energy storage unit, and replaced with a new cylindrical cell. This new cell might be equipped with one or two repair connectors, which are then connected to the second and / or third cylindrical cell remaining in the energy storage unit. This allows individual cylindrical cells to be replaced without having to replace an entire energy storage module.

[0023] The energy storage device can be designed as a high-voltage battery or a medium-voltage battery.

[0024] Furthermore, the invention also relates to a motor vehicle with an energy storage device according to the invention or one of its embodiments.

[0025] The motor vehicle according to the invention is preferably designed as a motor vehicle, in particular as a passenger car or truck, or as a passenger bus or motorcycle. The motor vehicle can, for example, be designed as an electric vehicle. The energy storage device can function as a traction battery for the motor vehicle. The motor vehicle can also include a cooling device to cool the energy storage device. During operation of the cooling device, the receiving space of the energy storage device can be supplied with coolant, in particular a liquid coolant, as already described above.

[0026] Furthermore, the invention also relates to a method for exchanging a first cylindrical cell of an energy storage device according to the invention or of one of its embodiments for a fourth cylindrical cell, wherein the first cell connector is cut so that a first connector section remaining on the first cylindrical cell and a second connector section remaining on the second cylindrical cell are provided, wherein the first cylindrical cell with the first connector section is removed from the associated first holding element, and wherein the fourth cylindrical cell, which comprises an end face with a first cell pole on which a repair cell connector is or is arranged, is inserted into the first holding element and the repair cell connector is joined with the second connector section.

[0027] Depending on the cylindrical cell being replaced and its position within the cylindrical cell array, the second cell connector described above can be cut to replace the first cylindrical cell. This connector provides electrical contact between the first cylindrical cell and the optional third cylindrical cell before the first cylindrical cell is removed from the array. The fourth cylindrical cell, which is then inserted, can include another repair cell connector. After the fourth cylindrical cell is inserted, this connector is connected to the remaining connector section on the third cylindrical cell.

[0028] Laser welding is a very advantageous method of joining, but other joining methods are also conceivable, such as gluing and / or crimping and / or riveting.

[0029] The invention also includes further developments of the method according to the invention, which have features already described in connection with the further developments of the energy storage device according to the invention. For this reason, the corresponding further developments of the method according to the invention are not described again here. Conversely, the process steps described in connection with the method according to the invention and its embodiments enable the further development of the energy storage device according to the invention by means of further corresponding material features.

[0030] The invention also includes combinations of the features of the described embodiments. The invention therefore also includes realizations that each exhibit a combination of the features of several of the described embodiments, provided that the embodiments have not been described as mutually exclusive.

[0031] The following are exemplary embodiments of the invention described. This is illustrated by: Fig. 1 a schematic cross-sectional representation of an energy storage device according to an embodiment of the invention; Fig. 2 a schematic representation of a holding device with cylindrical cells included therein for an energy storage device according to an embodiment of the invention in a top view; Fig. 3 a schematic representation of an energy storage device in a top view of cell connectors connecting cylindrical cells according to an embodiment of the invention; Fig. 4 a schematic cross-sectional representation of cutting two cell connectors for replacing a round cell according to an embodiment of the invention; Fig. 5 a schematic representation of the energy storage system Fig. 4 when removing the cylindrical cell to be replaced according to an embodiment of the invention; Fig. 6 a schematic representation of the energy storage system Fig. 4 and Fig. 5 when inserting a new cylindrical cell with repair cell connectors according to an embodiment of the invention; Fig. 7 a schematic representation of an energy storage device with a replaceable cylindrical cell according to an embodiment of the invention; and Fig. 8 a schematic representation of possibilities for producing a joining connection between connector sections and a repair connector according to an embodiment of the invention.

[0032] The exemplary embodiments described below are preferred embodiments of the invention. In these exemplary embodiments, the described components each represent individual features of the invention, which can be considered independently of one another and each further develops the invention independently. Therefore, the disclosure is intended to include combinations of features of the embodiments other than those shown. Furthermore, the described embodiments can also be supplemented by further features of the invention already described.

[0033] In the figures, identical reference symbols denote functionally equivalent elements.

[0034] Fig. Figure 1 shows a schematic cross-sectional view of an energy storage device 10 according to an embodiment of the invention. The energy storage device 10 comprises a receiving space 12 in which several battery cells in the form of cylindrical cells 14 are arranged. The receiving space 12 can be provided as the interior of a housing 16. The energy storage device 10 also comprises a holding device 18 for holding the cylindrical cells 14 in the receiving space 12. The holding device 18 can comprise individual holding elements 18a, in particular one holding element 18a per cylindrical cell 14, wherein each cylindrical cell 14 is received in such a holding element 18a, in particular in an opening 20 provided by the respective holding element 18a. The geometry of the holding elements 18a will be explained in more detail later. In particular, each holding element 18a has a cylindrical wall 22 that surrounds the respective cells 14 in a radial direction.The wall 22 has a distance d from the respective cylindrical cell 14, forming a free-flowing area 24, which constitutes a cooling channel 24 through which a coolant 26 flows. The energy storage device 10 can accordingly include a coolant supply port 28 and a coolant discharge port 29 in the housing 16. A coolant 26, in particular a liquid and electrically non-conductive coolant 26, can be supplied to the receiving chamber 12 via the coolant supply port 28, flows through this chamber, in particular through the respective cooling channels 24 provided between the walls 22 and the cells 14, and then exits the receiving chamber 12 via the coolant discharge port 29.

[0035] Fig. Figure 2 shows a schematic representation of an energy storage device 10 in a top view, i.e., in the z-direction of the depicted coordinate system. The retaining elements 18a of the holding device 18, with the cylindrical cells 14 housed within them, are particularly visible. The retaining elements 18a are designed as a kind of cage or nest. These can be made of, for example, plastic or, alternatively, metal, such as aluminum. In particular, the retaining elements 18a, or at least parts thereof, can be manufactured as extruded profiles. In addition to the aforementioned wall 22 of each retaining element 18a, which surrounds the respective cylindrical cell 14 in the radial direction, each retaining element 18a also has several radially inwardly projecting longitudinal webs 30, which can also be referred to as ribs.The longitudinal webs 30 can extend lengthwise in the z-direction, which in this case is parallel to the axial direction of the respective cylindrical cells 14. In the present example, each retaining element 18a comprises eight such longitudinal webs 30. However, more or fewer such longitudinal webs 30 can also be provided, for example, at least three longitudinal webs 30 per retaining element 18a. The longitudinal webs 30 can be spaced apart from each other in a circumferential direction U and arranged distributed on the inside of the wall 22.

[0036] Furthermore, an exemplary retaining element 18a without a cylindrical cell 14 is illustrated, particularly to demonstrate the base 32 of the retaining element 18a. This base need not necessarily be solid or completely closed, but can, for example, be designed with a web structure and / or with one or more perforations. In this example, the base 32 is provided by a base ring or base flange 34, which surrounds an opening 36 having a diameter (not shown in detail) that is smaller than the diameter of a given cell 14. The opening 36 advantageously provides a degassing option, or a simplified degassing option, for the cylindrical cells 14. These can, for example, be designed as shown in Fig. Figure 1 schematically depicts each cell with a releasable cell degassing opening 38. This opening is located on an end face 40 of each cell, facing the base 32 of the respective holding element 18a. The cell poles 44a, 44b can also be located on the opposite end face 42 of each cell 14. The cell poles 44a, 44b of the cells 14 can also be interconnected via cell connectors, as shown in Figure 1. Fig. 3 illustrated.

[0037] Fig. Figure 3 shows a schematic representation of an energy storage device 10 in a top view from above along the z-direction, now also illustrating the cell connector arrangement 46 for electrically connecting the cells 14 to one another. The energy storage device 10 can also be configured as described previously. This cell connector arrangement 46 comprises several individual cell connectors 48. Each of these cell connectors 48 is electrically connected to at least one pole 44a or 44b of a first cell 14 and another pole 44a or 44b of a second cell 14. Several positive poles or several negative poles of respective cells 14, in particular of more than two cells 14, can also be connected to one another by such a cell connector 48 in order to realize a parallel connection of the cells 14 or cell series connections, i.e., series cell strings. Fig. Figure 3 shows an example of a complete assembly of cells 14 with a nest structure, i.e., holding device 18, and electrical interconnection, whereby in this case a 3p connection is represented by the cell connectors 48, according to which three series cell strings are connected in parallel. Other alternative interconnections are also possible.

[0038] The described setup offers a particularly advantageous repair option in the event of a defect in cell 14, as will now be explained in more detail below. For example, the defective cell, additionally designated 14', is to be replaced. In doing so, the cell connectors 48 connected to this cell 14' can be cut, which in Fig. 3 schematically illustrated by the dividing lines 50. The cell connectors 48 of the defective cell 14' are thus separated. Then, after removing cell 14', a new replacement cell 14" can be inserted (compare Fig. 6 and Fig. 7), with corresponding repair cell connectors 52a, 52b, as will now be explained in more detail below with reference to Fig. 4 to Fig. 8 is described.

[0039] Fig. Figure 4 shows a schematic cross-sectional representation of a portion of an energy storage device 10 according to an embodiment of the invention. Three cylindrical cells 14 are illustrated as examples; for the sake of simplicity, these will be referred to below as the first cylindrical cell 14', the second cylindrical cell 14a, and the third cylindrical cell 14b. The first cell 14' is electrically connected to the second cell 14a via a first cell connector 48a. The first cell 14' is also electrically connected to the third cell 14b via a second cell connector 48b. The respective cell connectors 48a and 48b have a bend 52 for this purpose, since the poles 44a and 44b, respectively, which are connected to each other via the cell connectors 48a and 48b, are arranged at different heights with respect to the z-direction shown. It is now assumed that the first cell 14' is defective and is to be replaced.For this purpose, the cell connectors 48a, 48b are first connected, as in . Fig. Figure 4 shows the connection being cut. The cutting is again illustrated by the dividing lines 50. After cutting, the first cell connector 48a is thus divided into a first connector section 49a, which remains at the second cell 14a, and a second connector section 49b, which remains at the first cell 14'. The second cell connector 48b is then divided accordingly into a first connector section 50a, which remains at the third cell 14b, and a second connector section 50b, which remains at the first cell 14'.

[0040] As in Fig. As shown schematically in Figure 5, after cutting 50, the defective cell 14' can now be removed. The removal process is illustrated here by arrow 51. Removal 51 is very simple, since cell 14', and in particular all other cells 14 of the energy storage unit 10, are merely inserted into their associated retaining element 18a, which, along with the entire retaining device 18, is not shown here for clarity. They are not glued, welded, or otherwise bonded to it. The defective cell 14' is thus removed along with the connecting sections 49b and 50b still attached to it. After removal 51, as shown in Figure 5, the defective cell 14' can be removed. Fig. As shown in Figure 6, a new cell 14" is inserted, specifically into the retaining element 18a from which the defective cell 14' was removed. The insertion is illustrated by arrow 53. In this example, the new cell 14" has two repair connectors 52a, 52b. Each of the cell poles 44a, 44b of the new cell 14" is connected to a corresponding repair connector 52a, 52b and electrically conductively contacted. These connectors can, for example, be welded to the corresponding poles 44a, 44b. The repair connectors 52a, 52b are shaped such that they come into contact with the connector sections 49a, 50a when the new cell 14" is inserted into the cell assembly as intended, as shown in Figure 6. Fig. Figure 7 shows that the repair connector 52a, 52b, and the remaining connector sections 49a, 50a in the cell assembly overlap when the new or repaired cell 14" is inserted. The connector section 49a can then be joined to the first repair connector 52a, and the second connector section 50a to the second repair connector 52b, via a corresponding joining connection 54.

[0041] Several joining methods are possible for this, which are exemplified in Fig.Figure 8 illustrates this. For example, joining can be achieved by welding and / or soldering. The joining connection 54 can therefore be designed as a welded connection 54a or a soldered connection 54a. Alternatively or additionally, it can be designed as an adhesive connection 54b. Another possibility is a connection by crimping, i.e., a crimp connection 54c. The joining connection 54 can also be designed as a riveted connection with one or more rivets 54d.

[0042] Overall, the examples demonstrate how the invention provides a repairable, directly cooled module assembly with cylindrical cells. The described arrangement offers an effective and cost-efficient repair solution for a battery with cylindrical cells. The cylindrical cells can be held upright by a cage, preferably made of plastic. The cage can be designed such that the cells are encased by a tube formed by the wall of the respective holding element. This tube has internal ribs that hold the cells in place. This design allows the cells to be permanently mounted without the need for adhesives. The elimination of adhesives allows for the replacement of individual cells, thereby reducing repair costs by up to 90%, for example.The defective cell can be easily removed from its grid, and the new cell inserted. The new cell can then include all the necessary components, namely the repair connectors, to establish the electrical connection outside the cell. The cell connector sections can be welded or otherwise joined together outside the cell. Welding on the cell itself is therefore unnecessary. The aforementioned ribs serve to position and secure the cells. These ribs can simultaneously form a channel around the cells, which can be filled with dielectric fluid, particularly the non-conductive coolant. The dielectric fluid then flows between the cells and the surrounding frame, enabling direct cooling of the cells. An insulating film around the cells is unnecessary with the plastic nest, resulting in further cost reduction. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2014 002 165 B3

[0003] DE 10 2017 009 385 A1

[0005]

Claims

[1] Energy storage device (10) for a motor vehicle, comprising - a recording room (12); - several round cells (14; 14', 14a, 14b, 14") recorded in the recording room (12); and - a holding device (18) for holding the cylindrical cells (14; 14', 14a, 14b, 14"), wherein the holding device (18) comprises a holding element (18a) for each cylindrical cell (14; 14', 14a, 14b, 14") which has an opening (20) into which the respective cylindrical cell (14; 14', 14a, 14b, 14") is inserted, characterized by , that each retaining element (18a) - comprises a cylindrical wall (22) which encloses an interior space in the radial direction and which has a radial distance (d) from the cylindrical cell (14; 14', 14a, 14b, 14") received in the opening (20), and - comprises several longitudinal webs (30) arranged on the inside of the wall (22) and distributed in the circumferential direction (U) and projecting radially inwards. [2] Energy storage device (10) according to claim 1, characterized by , that the round cells (14; 14', 14a, 14b, 14") are held in the respective interior spaces of the retaining elements (18a) by means of the longitudinal webs (30) by clamping and / or frictional engagement. [3] Energy storage device (10) according to any of the preceding claims, characterized by , that in the interior of a respective holding element (18a) between the cylindrical cell (14; 14', 14a, 14b, 14") received in the holding element (18a) and the wall (22) several cooling channels (24) separated by the longitudinal webs (30) and through which a coolant (26), in particular a liquid coolant (26), can flow, are formed. [4] Energy storage device (10) according to any of the preceding claims, characterized by , that the energy storage device (10) includes a coolant supply port (28) and a coolant discharge port (29), each of which leads into the receiving chamber (12). [5] Energy storage device (10) according to any of the preceding claims, characterized by, that the retaining elements (18a) are attached to each other. [6] Energy storage device (10) according to any of the preceding claims, characterized by , that each retaining element (18a) has a base (32) with a central through-opening (36) opposite a releasable cell degassing opening (38) of the respective round cell (14; 14', 14a, 14b, 14"). [7] Energy storage device (10) according to any of the preceding claims, characterized by , that the cylindrical cells (14; 14', 14a, 14b, 14") comprise a first cylindrical cell (14') and a second cylindrical cell (14a), each comprising a first cell pole (44a, 44b) at end faces (42) pointing in the same first direction (z), which are electrically contacted via a first cell connector (48a). [8] Energy storage device (10) according to any of the preceding claims, characterized by, that the cylindrical cells (14; 14', 14a, 14b, 14") comprise a third cylindrical cell (14b) and the first and third cylindrical cells (14', 14b) each comprise a second cell pole (44b, 44a) at end faces (42) pointing in the same first direction (z), which are electrically contacted via a second cell connector (48b). [9] Motor vehicle with an energy storage device (10) according to any of the preceding claims. [10] Method for replacing a first cylindrical cell (14') of an energy storage device (10) according to one of claims 7 or 8, with a fourth cylindrical cell (14"), - wherein the first cell connector (48a) is cut, so that a first connector section (49b) remaining at the first cylindrical cell (14') and a second connector section (49a) remaining at the second cylindrical cell (14a) are provided, - the first round cell (14') with the first connector section (49b) is removed from the associated first retaining element (18a), - the fourth round cell (14"), which includes an end face (42) with a first cell pole (44a, 44b) on which a repair cell connector (52a) is or will be arranged, is inserted into the first retaining element (18a) and the repair cell connector (52a) is joined with the second connector section (49a).

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