Battery cell pack for a battery and battery

Abstract

It is particularly advantageous to mount or arrange a battery cell which changes with respect to its spatial expansion between a charged and a discharged state. [Solution] The battery cell pack 1 comprises battery cells 3 arranged next to each other, frame elements geometrically corresponding to the battery cells 3, wherein the battery cell 3 is fitted into the battery cell space formed by the two adjacent frame elements, thereby fixing the position of the battery cell 3 using the two adjacent frame elements, and one intermediate layer for each battery cell 3 arranged directly between the battery cells 3 and the frame elements so that the battery cell 3 is held in the battery cell space using the intermediate layer, wherein the intermediate layer is elastically compressed without breaking as specified by the expansion to the expanded dimensions of the directly adjacent battery cell 3, and the external dimensions 18 of the battery cell pack 1 remain constant despite the expansion of the battery cells 3.

Description

[Technical field]

[0001] The invention relates in particular to a battery cell pack having solid-state battery cells and in particular to a battery for an at least partially electrically drivable or mobile vehicle. [Background technology]

[0002] At least partially electrically driveable or mobile motor vehicles, in particular hybrid motor vehicles, electric motor vehicles, etc., are equipped with a battery, in particular a secondary battery, which stores and provides electrical energy for driving the motor vehicle by means of an electromechanical energy converter. For this purpose, the battery comprises a number of battery cells, which are formed, for example, as pouch cells. The battery cells are repeatedly charged and discharged during the operation of the motor vehicle, and each battery cell has different external dimensions, i.e. different three-dimensional dimensions, in the discharged and charged states. Due to the dimensional changes occurring during the operation of each battery cell, structural measures should be taken to receive (absorb) or compensate for the spatial (three-dimensional) dimensional changes at the mounting positions of the battery cells. The spatial dimensional changes appear in a volume difference of up to 10% per battery cell between the charged and discharged states.

[0003] Patent Document 1 proposes a battery having at least one battery cell and a conductor. Here, the conductor is arranged in a serpentine shape, which allows the conductor to follow the three-dimensional changes of the battery cell without damage. Patent Document 2 and Patent Document 3 each propose a battery assembly having two adjacent cell units, the cell units being adjacent to each other via a spacer element. At this time, a cooling passage is formed by the spacer element. In order to avoid the cooling passage formed by the spacer element being undesirably pressed together due to the expansion of the adjacent cell units, the spacer element is provided with a means for preventing the expansion of the cell units.

[0004] However, the conventional battery arrangement is particularly complex in terms of its structure and does not allow for a Cell-to-Pack integration with a sandwich structure, instead, the conventional battery arrangement requires at least one Cell-to-Module arrangement and only then is a Module-to-Pack integration possible. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] DE 102017008390 [Patent Document 2] DE 112012002517 [Patent Document 3] DE 112012002518 Summary of the Invention [Problem to be solved by the invention]

[0006] The object of the invention is to provide a particularly advantageous mounting or arrangement of battery cells which change in terms of their spatial extent between the charged and discharged state. [Means for solving the problem]

[0007] The problem is solved by the subject matter of the independent claims. Further possible embodiments of the invention are disclosed in the dependent claims, the description and the drawings.

[0008] According to the invention, a battery cell pack for a battery, in particular a vehicle battery, is proposed. In the specified mounting position of the battery cell pack, the battery or vehicle battery comprises a battery cell pack. The battery cell pack comprises a number of battery cells, in particular secondary battery cells, arranged next to one another. In one embodiment of the battery cell pack, each battery cell is formed as a solid-state battery cell. In this case, therefore, each battery cell comprises a solid electrolyte. In addition, in particular, each battery cell does not comprise any liquid. A battery cell configured in this way is called an ASSB cell (ASSB: All-Solid-State-Battery). Solid-state battery cells have the advantage of a particularly high energy density ratio and of improved operational safety.

[0009] In any case, the battery cell pack further comprises a number of frame elements which correspond geometrically to the battery cells, with the battery cells being positionally fixed by means of two directly adjacent frame elements, which are arranged relative to one another in such a way that a battery cell space is formed by or between the frame elements, in which the battery cells are fitted and thus positionally fixed or fixed in / at the directly adjacent frame elements.

[0010] In addition, the battery cell pack typically comprises at least one intermediate layer per battery cell, which is arranged directly between each battery cell and at least one of the frame elements positionally fixing the corresponding battery cell, whereby each battery cell is held in the battery cell space by means of the intermediate layer, in other words, the battery cell contacts by means of the intermediate layer either one of the frame elements or both frame elements which together form the battery cell space in which the battery cell is fitted in a defined manner.

[0011] The intermediate layer is formed so that it can be elastically compressed without breaking in a defined manner. Correspondingly, the battery cells, which are fitted into the battery cell space and are adjacent to the one or more intermediate layers, expand to an expanded dimension, so that the intermediate layer can be elastically compressed by the battery cells in a defined manner without breaking. The expanded dimension of the corresponding battery cell is then larger than the basic dimension of the corresponding battery cell. The expansion of the battery cell from its basic dimension to the expanded dimension is, for example, related to the actual state of charge (SOC). That is, the battery cell has the basic dimension in a discharged state (SOC=0), whereas the battery cell has the expanded dimension in a charged state (SOC>0). When the battery cell has the expanded dimension, the battery cell is larger in at least one spatial direction than when the battery cell has the basic dimension. In simple terms, when the battery cell has the expanded dimension, the battery cell is wider and / or longer and / or deeper than when the battery cell has the basic dimension.

[0012] In the battery cell pack, the size of the battery cell space and thus the external dimensions of the battery cell pack remain constant, especially in the three spatial directions, despite the expansion of the corresponding battery cells, because the dimensional changes in the battery space during the expansion of the corresponding battery cells are taken up or compensated for by one or more intermediate layers, by the respective intermediate layers being compressed in the battery cell space by the expansion of the corresponding battery cells. This means that the expanding or expanded battery cells exert a compressive force on the respective intermediate layers, which for example changes the thickness of each intermediate layer. The intermediate layers are then deformed, for example compressed, by the compressive force. The expansion of the battery cells does not appear as a dimensional change outside the battery cell space, since the frame elements which together form the battery cell space then remain relatively immobile with respect to each other. Thus, the geometry and the external dimensions of the frame elements remain constant, regardless of whether the battery cells have basic or expanded dimensions. Thus, the dimensions of the frame elements, and in particular the dimensions of the battery cell space, do not change during cycling of the battery cells.

[0013] Thus, advantageously, a cell-to-pack structure can be realized at the system level. In particular, a battery cell pack with a number of battery cells can be arranged in a sandwich structure and in particular connected, in particular glued, in a material-bonding manner to a housing element and / or a support element. For example, the battery cell pack can be glued to an upper housing side and to an underhousing side of a battery housing. Due to the sandwich structure, the battery cell pack can serve as a support element for the battery and / or a vehicle comprising the battery. For example, the vehicle body structure is reinforced by the sandwich structure of the battery cell pack. If such a battery cell pack or a battery comprising such a battery cell pack is used in a vehicle, this leads to particularly advantageous NVH qualities (NVH: noise, vibrations, harshness), since the battery cell pack or the battery has in particular few, in particular no, structural elements that can generate noise. Furthermore, due to the above-mentioned structure of the battery cell pack, the battery cell pack itself can be used as a support element. Furthermore, the battery cell pack can advantageously be incorporated into existing integration processes during battery or vehicle manufacturing without the need to significantly adapt the integration process to the battery cell pack.

[0014] Uneven distribution of pressure on each battery cell promotes dendrite growth inside the battery and ultimately destruction of the battery cell. The use of an intermediate layer, which is particularly provided entirely on / over the battery cell so that the entire width side of the battery cell is covered with the intermediate layer, ensures as even and flat a distribution of pressure as possible on the cells.

[0015] In another embodiment of the battery cell pack, each intermediate layer comprises a material having a Poisson's ratio (μ) of less than 0.3, i.e. μ<0.3, in particular μ<0.2, for example μ=0.1. In particular, each intermediate layer is formed of a material having such a small Poisson's ratio μ. Due to the particularly small Poisson's ratio μ, the intermediate layer undergoes no or only a small increase in dimensions transverse to the compression axis during compression along the compression axis. This ensures that the intermediate layer is pressed against one or more frame elements transverse to the expansion direction of the battery cells during expansion of the battery cells. This makes the battery cell pack particularly shape-stable, regardless of whether each battery cell has a basic dimension or an expanded dimension.

[0016] In one embodiment of the battery cell pack, each battery cell is configured with a foam material, particularly polyurethane foam, that is particularly open-celled and therefore capable of absorbing or compensating for the dimensional changes from the basic dimensions of the battery cell to the expanded dimensions due to the expansion of the battery cell.

[0017] In order to ensure a particularly long service life and particularly reliable operation of the battery cell pack, according to one development of the battery cell pack, the intermediate layer is respectively configured, i.e. shaped and arranged, in such a way that an initial pressure acts on each battery cell even when the battery cell is not expanded, i.e. has its basic dimensions, said initial pressure being at most 10 bar, preferably at most 5 bar, in particular at most 1 bar.

[0018] According to another embodiment, the battery cell pack comprises two pressure plates and two clamping elements, in particular clamping bands. The pressure plates define the battery cell pack along its longitudinal extension and are pressed against one another along its longitudinal extension by the clamping elements or clamping bands. For this purpose, the clamping elements and the pressure plates are connected to one another in a snap-in, interlocking and / or materially bonded manner. For example, the clamping elements and the pressure plates are welded, in particular laser-welded, clinched, screwed, riveted, glued, etc. to one another. The battery cells, the frame elements and the intermediate layer are then arranged between the pressure plates along the longitudinal extension, so that the battery cells, the frame elements and the intermediate layer are pressed against one another by the pressure plates and by the clamping elements. Furthermore, if the battery cells, the frame elements and the intermediate layer are arranged between the pressure plates in the defined manner, the clamping elements are subjected to a tensile load between the pressure plates.

[0019] Generally, for a battery cell pack, the battery cells, frame elements and intermediate layers can be arranged according to the following sequence: pressure plate (if present)-intermediate layer-battery cell-intermediate layer-frame element-intermediate layer-battery cell-intermediate layer-frame element, etc. With regard to the arrangement of the battery cells, frame elements and intermediate layers, the battery cell pack is in particular formed with mirror symmetry, so that at the corresponding end of the battery cell pack, the "last" battery cell is followed by the "last" intermediate layer, which is then followed by the corresponding pressure plate.

[0020] In developments of the battery cell pack, alternative / alternative arrangements of the pressure plate, battery cells, frame element and intermediate layer may be obtained, for example: pressure plate (if present)-intermediate layer-battery cell-intermediate layer-battery cell-intermediate layer-frame element-intermediate layer-battery cell-intermediate layer-battery cell-intermediate layer-frame element (and so on) or pressure plate (if present)-battery cell-intermediate layer-battery cell-frame element-battery cell-intermediate layer-battery cell-frame element (and so on).

[0021] The configuration of the battery cell pack with the pressure plate and the clamping element results in a particularly strong or stable battery cell pack structure, which can be used, for example in automotive construction, as a support element for or for an automotive vehicle in a particularly resource-efficient and / or structural space-efficient manner.

[0022] In another configuration of the battery cell pack, for example to further support an advantageous and particularly stable battery cell pack structure, the frame elements are fixed to one another by means of connecting elements. The connecting elements are snap-in, interlocking and / or material-bonding elements, in particular adhesive elements. This means that the frame elements are, for example, glued to one another. In general, the frame elements of the battery cell pack can be made of synthetic resin. In this case, it is conceivable to bond the frame elements to one another in a material-bonding manner using rigid plastic welding (plastic welding). Furthermore, it generally applies for each frame element that it comprises a base plate and a band arranged along the outer edge of the base plate, where the band protrudes from the base plate on both sides so as to form two opposing shells by the base plate and the band. Each frame element therefore has a double T-shape in cross section. This means that each frame element comprises an upper belt and a lower belt as well as a web connecting the upper belt to the lower belt, the belt being formed by the band and the web being formed by the base plate. And, as mentioned above, if two of the frame elements (the frame element arranged on the left and the frame element arranged on the right) are directly adjacent to each other, the battery cell space is defined on the inside by both webs and the belts, and the left shell of the right frame element and the right shell of the left frame element together form the battery cell space. If the frame elements are connected to each other in a snap-in, interlocking and / or materially bonded manner, the frame elements can be configured to be connected to each other via the upper and lower belts, i.e. the bands.

[0023] In a development of the battery cell pack, the battery cell pack comprises a further coupling element for fastening the frame element to the clamping element. This further coupling element can be formed identically or similarly to the (first) coupling element described above. It is also possible that the first coupling element and / or the further or second coupling element have a dual function, i.e., firstly, the function of coupling the frame elements to each other and, secondly, the function of coupling the frame element to the clamping element. In this respect, it is possible that the battery cell pack is configured to have only one coupling element, i.e., either the first coupling element or the second coupling element.

[0024] Fastening the frame element to the clamping element by means of the first and / or second connecting elements advantageously further supports a particularly strong or stable structure of the battery cell pack.

[0025] In addition, the invention relates to a battery, in particular for a motor vehicle, with a battery cell pack formed according to the above description. The battery, in particular the secondary battery, can be called a high-voltage battery. For example, a battery with one or more battery cell packs can be used as a drive battery for a motor vehicle, in which case the motor vehicle is configured to be at least partially electrically drivable or mobile. In this respect, the motor vehicle is, for example, a hybrid motor vehicle, an electric motor vehicle, etc. The motor vehicle is configured in particular as a private car and / or a commercial vehicle. However, this does not exclude the use of the battery or the battery cell pack for other applications (marine sector, aviation sector, etc.).

[0026] The features, advantages and advantageous features of a battery cell pack according to the invention may be considered as features, advantages and advantageous features of a battery according to the invention, and vice versa.

[0027] According to one development of the battery, the battery comprises a battery housing formed by a housing lower part and at least one housing upper part, where one or more battery cell packs and the housing lower part are glued to one another by means of a first adhesive device, and the battery cell pack and the housing upper part are glued to one another by means of a second adhesive device. In particular, the battery cell pack and the housing lower part or the housing upper part are glued to one another by means of a clamping element or a clamping band. This means that the adhesive device is in direct contact with the housing upper part or the housing lower part on the one hand and in contact with the corresponding clamping band on the other hand. In other words, the adhesive device is arranged between the upper part of the clamping element and the housing lower part and between the lower part of the clamping element and the housing lower part, so that the housing lower part and the battery cell pack as well as the housing upper part and the battery cell pack are bonded to one another in a material-bonding manner.

[0028] Furthermore, the invention relates to a vehicle equipped with a battery formed according to the above description. The features, advantages and advantageous features of the battery according to the invention may be regarded as features, advantages and advantageous features of the vehicle according to the invention and vice versa.

[0029] Further features of the invention will become apparent from the claims, the drawings and the description of the drawings. The features and combinations of features described herein above and those merely shown in the description and / or drawings below can be used not only in the respective described combinations but also in other combinations or alone, without departing from the scope of the invention. [Brief description of the drawings]

[0030] [Figure 1] FIG. 2 is a perspective view of a battery cell pack. [Diagram 2] FIG. 2 is an exploded view of the battery cell pack taken along section II-II (see FIG. 1). [Diagram 3]FIG. 2 shows the battery cell pack in an assembled state, cut along section II-II. [Figure 4] FIG. 1 is a plan view of a battery with two battery cell packs. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] In the various figures, identical and functionally identical elements are labeled with the same reference numbers.

[0032] A battery cell pack 1, a battery 2 comprising the battery cell pack 1, and a vehicle (not shown) are described below in a common description. For this purpose, FIG. 1 shows a perspective view of the battery cell pack 1 with a number of battery cells 3 arranged next to each other. In FIG. 1, only some of the battery cells 3 are correspondingly numbered. In this example, each battery cell 3 is formed as a solid-state battery cell. This applies to battery cells that simply have a solid electrolyte and no liquid components, but the invention is not limited to liquid-free battery cells. Rather, the term "battery cell" here includes all forms of pouch cells that expand in operation. Each battery cell 3 or solid-state battery cell is therefore a so-called ASSB cell.

[0033] Furthermore, it can be seen from FIG. 1 that in this example the battery cell pack 1 comprises two pressure plates 4, 5 and two clamping elements 6, 7. The battery cell pack 1 is laterally delimited along a longitudinal extension direction 8 by the pressure plates 4, 5. The clamping elements 6, 7, which are here each configured as a clamping band, extend completely along the longitudinal extension direction 8 of the battery cell pack 1 and are connected to the pressure plates 4, 5 in a snap-fit, interlocking and / or materially bonded manner. In this example, the clamping elements 6, 7 or the clamping bands and the pressure plates 4, 5 are riveted to one another. In FIG. 1, corresponding riveting points 9 can be seen, only some of which are given corresponding reference numbers for reasons of clarity.

[0034] FIG. 2 shows an exploded view of the battery cell pack 1 cut along the section II-II (see FIG. 1). The battery cell pack 1 comprises a number of frame elements 10 which correspond geometrically to the battery cells 3, with the aid of which the corresponding battery cells 3 are fixed in position by means of two directly adjacent frame elements 10, by means of which the corresponding battery cells 3 are fitted into the battery cell spaces 11 formed by the two directly adjacent frame elements 10. Here, each frame element 10 has a double-shell shape with two shells facing away from each other or away from each other, and thus in cross section in the form of a double T-beam. Furthermore, here, each battery cell 3 is formed according to a flat cube, with the respective narrow side 12 of the battery cell 3 being arranged parallel to the longitudinal extension direction 8 and the respective wide side 13 of the battery cell 3 being arranged perpendicular to the longitudinal extension direction 8. In the assembled state (see FIG. 3 ), the upper belts 14 and the lower belts 15 of each frame element 10 are directly adjacent to each other, and each battery cell 3 is arranged parallel to each web 16 of each frame element 10. In this case, each battery cell 3 is arranged between the webs 16 of the frame elements 10.

[0035] In order that each battery cell 3 is held in the battery cell space 11 by the intermediate layer 17, the battery cell package 1 comprises at least one intermediate layer 17 for each battery cell 3, here two intermediate layers 17 arranged directly between each battery cell 3 and the frame element 10. It is possible for the battery cell pack 1 to be configured so that it is terminated at the frame element 10, at the intermediate layer 17 or at the battery cell 3. As mentioned above, in this example the battery cell pack 1 is terminated at the sides by the pressure plates 4, 5, so that in this example the battery cell pack 1 comprises two battery cells 3 which are adjacent to one of the frame elements 10 via the intermediate layer 17 only on one side. In this case, the "last" battery cell 3 is correspondingly adjacent to the respective pressure plate 4, 5 on the other side. This means that in this example two battery cell spaces 11 are obtained, which are formed on the one hand by the frame element and on the other hand by the corresponding pressure plate 4, 5. In this respect it is possible to configure so that each "last" battery cell 3 is at least partially surrounded by the respective pressure plate 4, 5.

[0036] Each battery cell 3 has basic dimensions, i.e. a basic width, a basic length and a basic depth (basic height), which the battery cell 3 expands to during its lifetime on the one hand and under charging on the other hand. For a new or brand new battery cell 3, the battery cell has basic dimensions, i.e. external dimensions corresponding to the basic dimensions, in an uncharged state (SOC=0). When the battery cell 3 is charged, it expands in terms of width and / or length and / or depth. Furthermore, the width and / or length and / or depth of the battery cell expand during the aging of the battery 3. However, in order to ensure a constant or identically remaining length 18 of the battery cell pack 1, regardless of the state of charge of the battery cells 3 of the battery cell pack 1 and regardless of the respective age of the battery cells 3 of the battery cell pack 1, each intermediate layer 17 is formed in a prescribed manner so as to be elastically compressible without breaking. Each intermediate layer 17 then comprises a material with a Poisson's ratio μ smaller than 0.3, i.e. μ<0.3, in particular μ<0.2, for example μ=0.1. In other words, each intermediate layer 17 is at least partially formed by a material with a particularly low Poisson's ratio μ. Here, each intermediate layer comprises a foamed material, in particular a polyurethane foam. This means that each intermediate layer 17 is at least partially formed of a foamed material, for example a polyurethane foam.

[0037] Thus, the expansion of each battery cell 3 to its expanded dimensions causes the intermediate layer 17 to compress elastically in a prescribed manner and without destruction, so that the size of the battery cell space 11, and thus the external dimensions, in particular the length 18, of the battery cell pack 1 remain constant despite the expansion of the corresponding battery cell 3.

[0038] In Fig. 3, a view of the battery cell pack 1 in the assembled state is shown cut along the section II-II. As indicated by the ellipses 19 in Fig. 2, the battery cell pack 1 can be formed in its longitudinal extension direction 8 by any number of units 20, each unit 20 comprising at least one battery cell 3 and an intermediate layer 17, in particular another intermediate layer 17. Two successive units 20 along the longitudinal extension direction 8 are then in contact with each other by means of a frame element 10. Thus, the following arrangement is obtained in the battery cell pack 1 along the longitudinal extension direction 8: pressure plate 4 - unit 20 - frame element 10 - unit 20 - frame element 10, etc. The "last" frame element 10 is followed by the "last" unit 20 and then by the pressure plate 5. The battery cells 3, the frame element 10 and the intermediate layer 17 are pressed against each other between the pressure plates 4, 5 along the longitudinal extension direction 8. In other words, the units 20 are pressed against one another between the pressure plates 4, 5 along the longitudinal extension direction 8. For this purpose, the clamping elements 6, 7 or the clamping bands and the pressure plates 4, 5 are riveted to one another at the riveting points 9 and / or are otherwise connected to one another in a snap-in, interlocking and / or materially bonded manner. The clamping elements 6, 7 are then subjected to a tensile load, so that at least the frame elements 10 are clamped to one another at the respective upper belt 14 and / or the respective lower belt 15. Alternatively or additionally, two frame elements 10 which are directly adjacent to one another along the longitudinal extension direction 8 are snap-in, interlocking and / or materially bonded to one another by means of a first connecting element 21. Since the respective frame elements 10 are made of synthetic resin in this example, the first connecting element 21 can be formed as a synthetic resin weld. The first connecting element 21 can also be formed as an adhesive point. In particular, both frame elements 10 which are directly adjacent to each other are fixed or secured to each other via their respective upper belts 14 and / or their respective lower belts 15 .

[0039] As can be seen in Figures 2 and 3, in this example it is furthermore arranged that the frame element 10 is fixed to the clamping elements 6, 7 by means of second connecting elements 22. The second connecting elements 22 are for example adhesive elements or adhesive layers arranged between the belts 14, 15 and the clamping elements or clamping bands 6, 7. By means of the first connecting elements 21 or by means of the second connecting elements 22, each connection between both frame elements 10 directly adjacent to each other and also between the frame elements 10 and the clamping elements 6, 7 can be realised. This means that the battery cell pack 1 can comprise only the first connecting elements 21 or only the second connecting elements 22, the corresponding connecting elements 21, 22 having a double function.

[0040] Each intermediate layer 17 is configured such that an initial pressure of up to 10 bar, preferably up to 5 bar, in particular up to 1 bar, acts on each battery cell 3 when the battery cell is not inflated, thereby ensuring reliable operation of the battery cells 3.

[0041] Thus, as each battery cell 3 expands from its basic dimension to its expanded dimension, at least one intermediate layer, in particular both intermediate layers 17, arranged in the battery cell space 11 in common with the battery cell 3, is compressed by the expanding battery cell 3, without affecting the geometry and dimensions of the battery cell space 11. In particular, each intermediate layer 17 is compressed by the amount that the battery cell 3 expands upon expansion. Thus, advantageously, the expansion or dimensional expansion of the battery cell 3 is accommodated (absorbed) or compensated for.

[0042] FIG. 4 shows a plan view of a battery 2 with two battery cell packs 1. The battery 2 is in particular designed for vehicles that can be driven at least partially electrically, i.e. for hybrid vehicles, electric vehicles, etc., and can serve as a drive battery for vehicles. The battery 2 can be called a high-voltage battery. According to FIG. 4, the battery 2 has a battery housing 23, which is formed by a lower housing part 24 and at least one upper housing part 25. Here, each battery cell pack 1 is held in a material-bonded manner both in the lower housing part 24 and in the upper housing part 25. This means that each battery cell pack 1 is connected in a material-bonded manner both in the lower housing part 24 and in the upper housing part 25. In this example, each battery cell pack 1 is glued to the housing parts 24, 25 by means of gluing devices 26, 27. The housing parts 24, 25 and the gluing devices 26, 27 are illustrated in FIGS. 2 and 3. It can further be seen in Figures 2 and 3 that in this example the battery cell pack 1 is glued to the housing lower part 24 or to the housing upper part 25 via its clamping bands or clamping elements 6, 7. In this respect, the glueing device 26 is between the housing upper part 25 and the clamping element 6 of the battery cell pack 1. In contrast, the glueing device 27 is between the clamping element 7 and the housing lower part 24.

[0043] It is also conceivable that the battery 2 does not have a separately formed battery housing 23. In this case, the pressure plates 4, 5 and the clamping elements 6, 7 serve as the outer surface of the battery 2, so to speak, as a housing for the battery 2. Due to the particularly stable construction of the battery cell pack 1, a separately formed battery housing 23 can be omitted, which offers mass advantages.

[0044] Overall, the invention shows a particularly advantageous possibility of fitting or arranging the battery cells 3, which change with respect to their spatial expansion between the charged and discharged states. The fitting or arranging of the battery cells 3 is particularly advantageous with respect to the now possible Cell-to-Pack structure at the system level. The conventional process step of first arranging the conventional battery cells according to Cell-to-Module in order to arrange the resulting module according to Module-to-Pack can be omitted, which is economically and environmentally favorable. Furthermore, the pressure plates 4, 5 and the clamping elements 6, 7 provide for a particularly strong or stable structure for the battery cell pack 1, so that the battery cell pack 1 can even act as a support structure. [Explanation of symbols]

[0045] 1 Battery Cell Pack 2 Battery 3 Battery Cells 4 Pressure Plate 5 Pressure Plate 6 Clamping elements 7 Clamping Elements 8 Longitudinal extension direction 9 Riveting points 10 Frame Elements 11 Battery cell space 12 Narrow side 13 Wide side 14 Upper Belt 15 Lower Belt 16 Web 17 Middle Class 18 Length 19 Ellipsis 20 units 21 First coupling element 22 Second coupling element 23 Battery housing 24 Lower part of housing 25 Upper part of housing 26 Next installation 27 Next installation

Claims

1. - A plurality of battery cells (3) arranged adjacent to each other; - A plurality of frame elements (10) geometrically corresponding to the battery cells (3), wherein the corresponding battery cells (3) are fitted into a battery cell space (11) formed by two frame elements (10) adjacent to each other directly, and the battery cells (3) are position-fixed using the two frame elements (10) adjacent to each other directly; - One intermediate layer (17) for each battery cell (3), the intermediate layer (17) being disposed directly between each battery cell (3) and the frame element (10) such that each battery cell (3) is held in the battery cell space (11) by the intermediate layer (17) comprising The intermediate layer (17) is elastically compressible without being ruptured as prescribed by the expansion of the directly adjacent battery cells (3) to their expanded dimensions, whereby, despite the expansion of the corresponding battery cells (3), the size of the battery cell space (11), and thus the external dimensions (18) of the battery cell pack (1), remain constant. A battery cell pack (1) characterized by this.

2. The battery cell pack (1) according to claim 1, characterized in that each battery cell (3) is formed as a solid battery cell.

3. The battery cell pack (1) according to claim 1 or 2, characterized in that each intermediate layer (17) has a material with a Poisson's ratio (μ) of less than 0.

3.

4. The battery cell pack (1) according to claim 1 or 2, characterized in that each intermediate layer (17) has a foamed material.

5. The battery cell pack (1) according to claim 1 or 2, characterized in that the intermediate layer (17) is configured such that an initial pressure of at most 10 bar, preferably at most 5 bar, particularly at most 1 bar, acts on each battery cell (3) when the battery cells are not expanded.

6. Two pressure-receiving plates (4, 5) and two clamping elements (6, 7) are provided. The pressure-receiving plates (4, 5) define a battery cell pack (1) along the longitudinal extension direction (8), and a battery cell (3), a frame element (10), and an intermediate layer (17) arranged between the pressure-receiving plates (4, 5) along the longitudinal extension direction (8) are clamped to each other. The battery cell pack (1) according to claim 1 or 2, characterized in that they are clamped to each other along the longitudinal extension direction (8) using the clamping elements (6, 7).

7. The battery cell pack (1) according to claim 1 or 2, characterized in that the frame elements (10) are fixed to each other using a coupling element (21).

8. The battery cell pack (1) according to claim 6, characterized in that the frame element (10) is fixed to the clamping elements (6, 7) using another coupling element (22).

9. A battery (2) comprising a battery cell pack (1) formed according to claim 1 or 2.

10. A battery housing (23) comprising a housing lower part (24) and a housing upper part (25) is provided. The battery cell pack (1) and the housing lower part (24) are adhered to each other using an adhesion device (27), and the battery cell pack (1) and the housing upper part (25) are adhered to each other using another adhesion device (26). The battery (2) according to claim 9, characterized in that.

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