Method for introducing a thermally conductive material into a battery module and injection arrangement
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- AUDI AG
- Filing Date
- 2021-03-02
- Publication Date
- 2026-06-11
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
[0001] The invention relates to a method for introducing a thermally conductive material into at least a first free space in a battery module, wherein the battery module is provided with a module housing and a cell pack with at least one battery cell arranged in the module housing, wherein the module housing has a first housing side and a second housing side opposite the first housing side, wherein the cell pack has a first side facing the first housing side and a second side opposite the first side facing the second housing side, and wherein the cell pack is arranged in the housing such that there is a first free space between the first side of the cell pack and the first housing side and a second free space between the second side and the second housing side.Furthermore, the thermal conductivity is filled into the first cavity, and simultaneously, a second thermal conductivity is filled into the second cavity. The invention also relates to an injection arrangement.
[0002] Battery housings for one or more battery modules, particularly for high-voltage batteries, are known in the prior art. A cooling device is often arranged below the housing base to dissipate heat from a battery module to the cooling device via the housing base. In principle, such a cooling device can also be arranged on any other side of a battery module. To improve the thermal connection to such a cooling device, it is also known to use a thermally conductive compound, also called a gap filler, which can be applied to such gaps, for example, between a module housing and the cooling base. Various methods are available for applying such a thermally conductive compound. For example, such a compound can be applied to the cooling base, and then the battery module can be placed on top.A similar procedure is described, for example, in DE 10 2018 222 459 A1. Since such a gap filler is a very viscous mass, pressing the module into place exerts very high forces on the battery module and also on the cooling tray, necessitating additional measures such as counter-supports to brace the cooling tray. A gentler alternative is to inject such a thermally conductive compound through a suitable access opening into the gap between the battery module (already placed on the tray or inserted into the housing) and the tray itself, as described, for example, in DE 10 2019 208 806 B3. This injection process is far gentler on the battery modules.
[0003] Furthermore, it is also known from the prior art, as described, for example, in EP 3 444 889 A1, to inject a thermally conductive adhesive into a battery module itself in order to improve the thermal connection between the battery cells housed in such a module or the module housing and the housing. Here, attempts are made to reduce the stress on the battery cells resulting from the injection pressure by, for example, injecting such a thermally conductive adhesive simultaneously through several injection holes provided in the underside of the housing, or by orienting the module vertically during injection and injecting the material at an upper edge so that it is further distributed under the influence of gravity.
[0004] This pressure acting on the battery cells is particularly problematic when the battery cells are, for example, pouch cells, since their casing is usually formed from two thin films joined together at an edge, where such an edge may have a circumferential fold or crimp or a folded area, i.e. generally a connection area that protrudes outwards.
[0005] Applying injection pressure to one side of the battery cell can result in very high local pressure on the other side of the cell, due to the protruding edge being pressed against the opposite inner surface of the housing. This, in turn, can damage the battery cells. The pressure reduction measures described above are only partially effective in this case. Therefore, the effort to find a gentler way to inject such a thermally conductive compound into a battery module remains.
[0006] DE 10 2018 125 289 B3 describes a method for introducing a thermal conductivity medium into a vehicle battery module, wherein several filling lances are inserted into gaps adjacent to a battery cell pack and the battery housing or side wall, and then the gap is filled with thermal conductivity medium. During this filling process, the individual filling lances are slowly withdrawn from the gap.
[0007] The object of the present invention is therefore to provide a method and an injection arrangement that makes it possible to fill a thermally conductive compound into a battery module in a manner that is as gentle as possible for at least one battery cell of the battery module.
[0008] This problem is solved by a method and an injection arrangement with the features according to the respective independent claims. Advantageous embodiments of the invention are the subject of the dependent claims, the description, and the figures.
[0009] In a method according to the invention for introducing a first thermally conductive material into at least a first cavity in a battery module, the battery module is provided with a module housing and a cell pack with at least one battery cell arranged in the module housing, wherein the module housing has a first housing side and a second housing side opposite the first housing side. Furthermore, the cell pack has a first side facing the first housing side and a second side opposite the first side of the cell pack and facing the second housing side. The cell pack is further arranged in the housing such that there is a first cavity between the first side of the cell pack and the first housing side, and a second cavity between the second side of the cell pack and the second housing side. The first thermally conductive material is then filled into the first cavity.Simultaneously with the filling of the first thermal conductivity compound into the first cavity, a second thermal conductivity compound is filled into the second cavity. The first thermal conductivity compound is filled into the first cavity through at least one filling opening in the first side of the housing, and the second thermal conductivity compound is filled into the second cavity through at least one second filling opening in the second side of the housing.
[0010] Thus, the thermal conductivity can advantageously be injected simultaneously, at least temporarily, into opposite sides of the cell pack. This allows the battery cells of the cell pack to be kept in mechanical equilibrium, i.e., in terms of force. In other words, the injection of the first thermal conductivity into the first cavity exerts a force on at least one battery cell of the cell pack, which is counteracted by an opposing force caused by the simultaneous injection of the second thermal conductivity into the second cavity. Since the thermal conductivity is a relatively viscous mass, particularly both the first and the second thermal conductivity, the forces acting on the cell pack, which are still present, can be distributed much more evenly and therefore no longer act locally on the battery cells.This significantly reduces the likelihood of battery cell damage. This is particularly advantageous for pouch cells; however, the described method can also be applied to other battery cells, such as prismatic or cylindrical cells, and also allows for a gentler filling of cavities with a thermally conductive compound.
[0011] The thermal interface material can be the gap filler mentioned earlier. Such a thermal interface material can have a viscous and / or pasty consistency. It therefore has a higher viscosity than, for example, water. Furthermore, the first and second thermal interface materials can preferably be the same thermal interface material.
[0012] The at least one battery cell of the cell pack can, for example, be a lithium-ion cell. Furthermore, it can have any shape. The battery cell can also have two terminal contacts, which are preferably not located on the first and second sides of the cell pack. In other words, the terminals of the battery cell should preferably not be embedded in the thermal interface material.
[0013] Furthermore, the first and second sides of the module housing can, for example, define the top and bottom of the battery module. In principle, however, the first and second sides of the housing can be any side of the module, provided these two sides are opposite each other. The same applies to the two sides of the cell pack, which can also be called the cell stack. For clarity, however, the first and second sides of the cell pack, as well as the first and second sides of the module housing (i.e., the first and second housing sides), will sometimes be referred to as the top and bottom. The dimension of the battery module in a first direction, from the top to the bottom, will, for example, define the height of the battery module. It is also preferred that the cell pack comprises several battery cells. These can then, for example, be arranged next to each other perpendicular to the first direction.The orientation of these multiple battery cells can, for example, define a longitudinal direction of the battery module. Preferably, the multiple battery cells of the cell pack are clamped together. Furthermore, the cell pack can be clamped within the module housing in such a way, particularly clamped across different housing sides (first and second), that the cell pack is held within the module housing by this clamping force. This clamping force ensures that the first side has the first clearance from the first housing side and, in particular, also a distance from the first housing side, while the second side simultaneously has the second clearance from the second housing side and, in particular, can also have a distance from the second housing side. Furthermore, the first and second sides of the cell pack need not necessarily be planar in a direction perpendicular to the first direction.On the contrary, especially when the battery cells are designed as pouch cells, for example, the surface structure of the first side of the cell pack is characterized by the protruding crimped and folded joints described earlier. Parts of these protruding crimped and folded joints may, under certain circumstances, touch the first and / or second side of the casing. Consequently, the height of the cell pack, when viewed in the first direction, is not necessarily constant in a second direction perpendicular to the first.
[0014] In a particularly advantageous embodiment of the invention, the cell pack, comprising at least one pouch cell, preferably several pouch cells, is provided as the at least one battery cell when the battery module is supplied. As already described, the invention offers particularly significant advantages in the case of pouch cells, since pouch cells are especially susceptible to damage during conventional injection processes due to their uneven edge geometry. The invention enables a particularly gentle thermal interface material injection process specifically for pouch cells. Pouch cells can thus be thermally bonded to the inner surfaces of the module housing in a particularly gentle manner.
[0015] In a further advantageous embodiment of the invention, the first free space comprises several first sub-areas arranged side by side perpendicular to a first direction, and the second free space comprises several second sub-areas arranged side by side perpendicular to the first direction, wherein each first sub-area is associated with a second sub-area and is arranged in the first direction above the associated second sub-area, wherein the first and second thermally conductive materials are filled in such a way that each first sub-area is filled with the first thermally conductive material in a manner that overlaps with the filling of the second thermally conductive material into the associated second sub-area. The first direction can, in particular, correspond to the first direction defined above.This embodiment of the invention has the significant advantage of enabling a particularly uniform filling of the thermal conductivity on both sides of the cell pack. As a result, opposite sides, and especially parts of these opposite sides of the cell pack, are almost always in force equilibrium due to the correspondingly filled thermal conductivity. This prevents the formation of local pressure points and effectively counteracts potential damage to the battery cells. Such homogeneous filling can be achieved not only in the second direction defined above, but also, for example, in a third direction perpendicular to the first and second directions.
[0016] Especially with pouch cells that lack a defined edge geometry, it is often the case that the first and second cavities differ from each other in terms of their geometry and volume. Accordingly, achieving a uniform distribution of the thermal interface material on both sides of the cell pack cannot be achieved simply by setting the same flow rate or filling pressure for the thermal interface material on both sides.
[0017] Accordingly, a further, highly advantageous embodiment of the invention is achieved if, during the filling of the first and second thermal conductivity materials, the current fill level of the first and second cavities is detected and the filling of the first and / or second thermal conductivity materials is controlled depending on the respective current fill levels. This advantageously allows for a uniform filling of the thermal conductivity materials on both sides of the cell pack. The filling of the thermal conductivity materials into the first and second cavities is carried out according to a control system that depends on the current fill level of the respective cavities.For example, if the thermal conductivity on the first side of the cell pack has spread less than on the second side, the flow rate used to fill the first side can be increased accordingly, and vice versa. The filling process can also be controlled or regulated so that the product of the filling pressure and the area wetted by the thermal conductivity is approximately the same for both sides of the cell pack at any given time.
[0018] It is particularly advantageous if the amount of thermal conductivity filled into the first and / or second cavity per unit of time is controlled based on a measured difference between the current fill level of the first cavity and the current fill level of the second cavity. Such control can be implemented as described above. For example, an optical detection device can be used to monitor the fill level. Several inspection openings can be provided in the first and second sides of the housing, which can also function as vents, allowing air to escape during the filling process. These openings...For example, a laser beam can be projected through inspection openings to detect whether the thermal interface material spreading in the respective cavities has already reached these openings, which are preferably distributed across the respective sides of the housing. This allows for the detection of the thermal interface material fill level at the various positions on the first and / or second side of the cell pack and how far the corresponding thermal interface material fronts have spread on the respective sides of the cell pack. However, other detection methods for determining the current fill level are also conceivable.
[0019] As an alternative to such a controlled filling process, it can also be based on pre-determined filling parameters. These parameters may, for example, have been determined experimentally beforehand and ensure that the filling process is carried out in such a way as to achieve uniform filling on both sides of the cell pack. This advantageously eliminates the need for monitoring the filling status.
[0020] According to the invention, the first thermal conductivity compound is filled into the first cavity through at least one first filling opening in the first housing side, and the second thermal conductivity compound is filled into the second cavity through at least one second filling opening in the second housing side. For example, an injection device can move up to such a filling opening and then inject the thermal conductivity compound through the filling opening into the respective cavity. In addition to the at least one filling opening, each housing side, i.e., the first and the second housing side, preferably also has a vent hole so that the air displaced by the injected thermal conductivity compound can escape.Multiple vent holes can be provided in different positions, ensuring that the respective spaces can be completely filled, even if some of the vent openings are already covered by the spreading thermal compound.
[0021] Furthermore, it is particularly advantageous if not only several vent openings but also several filling openings are provided. Therefore, it represents a further highly advantageous embodiment of the invention if the first thermally conductive material is filled into the first cavity through several first filling openings in the first housing side, at least overlapping in time, and in particular simultaneously, and the second thermally conductive material is filled into the second cavity through several second filling openings in the second housing side, at least overlapping in time, and in particular simultaneously. By filling the thermally conductive material into the respective housing sides simultaneously through several filling openings, faster and more uniform filling of the spaces or cavities can be achieved, and the local pressure on the battery cells can also be significantly reduced.In other words, by providing multiple filling openings, the filling pressure can be reduced, since the thermal conductivity compound no longer needs to be pressed into areas that are so far apart.
[0022] It is also advantageous if these filling openings on the same side of the housing are not arranged along a line. Providing several holes on the housing side that lie on the same line creates a kink or weak point that reduces the housing's stability. This can advantageously be prevented by distributing the filling openings, at least in some areas. For example, it is sufficient if the filling openings are arranged in a zigzag or serpentine pattern. Multiple filling openings can be provided on each side of the housing, both in the second and third directions.
[0023] Furthermore, the invention also relates to an injection arrangement for introducing a first thermally conductive material into at least a first free space in a battery module, wherein the injection arrangement comprises a battery module with a module housing and at least one cell pack arranged in the module housing with at least one battery cell, wherein the module housing has a first housing side and a second housing side opposite the first housing side, wherein the cell pack has a first side facing the first housing side and a second side opposite the first side, which faces the second housing side, wherein the cell pack is arranged in the housing such that there is a first free space between the first side of the cell pack and the first housing side and a second free space between the second side and the second housing side.Furthermore, the injection arrangement includes an injection device designed to fill the first thermal interface material into the first cavity. The injection device is further designed to fill the first thermal interface material into the first cavity and a second thermal interface material into the second cavity simultaneously, with the first thermal interface material being filled into the first cavity through at least one filling opening in the first side of the housing and the second thermal interface material being filled into the second cavity through at least one second filling opening in the second side of the housing. Preferably, the filling process occurs simultaneously, meaning it begins and ends at approximately the same time.
[0024] The advantages mentioned for the method according to the invention and its embodiments apply in the same way to the injection arrangement according to the invention.
[0025] Furthermore, it is preferred that the cell pack comprises several battery cells designed as pouch cells, which are arranged side by side in a second direction perpendicular to the first direction from the second housing side to the first housing side. Particularly significant advantages of the invention become apparent with regard to pouch cells, as already described.
[0026] It is particularly advantageous if the first and / or second side of the housing has a groove structure with several grooves running parallel to each other in a third direction, the third direction being perpendicular to the first and second directions.
[0027] This has the significant advantage that the connection points or folded or crimped edges, which are typically protruding at the edges of pouch cells (e.g., keel-shaped), can be at least partially accommodated by the recesses provided by the grooves. In other words, this provides a geometric design for the inner wall of the first and / or second housing side that corresponds to the geometric design of the surface structure of the first and / or second side of the cell pack. This reduces the volume of the free space to be filled, i.e., the first and / or second free space. This free space therefore also has a three-dimensional surface structure, both in the direction of the cell pack and in the direction of the respective housing side. The housing itself is preferably made of metallic material, preferably aluminum.
[0028] Metals, especially aluminum, have a significantly higher thermal conductivity than the aforementioned thermal interface material. In particular, the thermal conductivity of aluminum is approximately 50 times greater than that of typical gap fillers. Accordingly, it is especially advantageous to keep the gap to be filled with the thermal interface material as small as possible. This can be achieved by creating grooves on the first and / or second side of the housing. This significantly improves the thermal connection to, for example, a heat sink that is coupled to the battery module.
[0029] The invention also includes further developments of the injection arrangement according to the invention, which have features already described in connection with the further developments of the method according to the invention. For this reason, the corresponding further developments of the injection arrangement according to the invention are not described again here.
[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 injection arrangement with a battery module during a first time step of an injection process according to an embodiment of the invention; Fig. 2 a schematic representation of the injection process at a later second time step according to an embodiment of the invention; Fig. 3 a schematic cross-sectional representation of the injection process at a later third time according to an embodiment of the invention; Fig. 4 a schematic representation of a top view of an end face of a pouch cell in a module housing for an injection arrangement according to an embodiment of the invention; and Fig. 5 a schematic representation of a battery module for an injection arrangement 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 representation of an injection arrangement 10 with a battery module 12 during an injection process at a first time step t1 according to an embodiment of the invention. The battery module 12 has a module housing 14 in which a cell pack 16 is arranged. The cell pack 16 generally comprises at least one battery cell 18, preferably several battery cells, here by way of example five battery cells 18. These are preferably designed as pouch cells. Furthermore, the battery cells 18 of the cell pack 16 are arranged side by side in the x-direction shown here. Between the cells 18 and also outside the cell pack 16, further elements, such as insulating layers, swelling plates or swelling pads, clamping elements or the like, can be arranged, which, however, are not shown here and are not relevant to the invention.The module housing 14 has a first side 14a and a second side 14b opposite the first side 14a. The cell pack 16 also has a first side 16a facing the first housing side 14a and a second side 16b opposite the first side 16a, facing the second housing side 14b. In the present case, the first housing side 14a represents a top side of the housing 14 and the second housing side 14b a bottom side of the housing 14. Similarly, the first side 16a of the cell pack 16 represents a top side of the cell pack 16, and the second side 16b of the cell pack 16 represents a bottom side of the cell pack 16. Furthermore, the cell pack 16 is arranged on the housing 14 such that a first free space 20a is arranged between the first side 16a of the cell pack 16 and the first housing side 14a, and a second free space 20b is arranged between the second side 16b and the second housing side 14b.
[0035] To ensure optimal thermal contact between battery cells within a housing and an external cooling element, such as a cooling plate or similar device, it is advantageous to fill gaps, such as the two gaps 20a and 20b described above, with a gap filler or thermally conductive compound. This can be achieved by injecting such a compound. With conventional injection methods, the injection process and the material viscosity generate a corresponding pressure that acts on the cells. This pressure and force typically act unilaterally on the cells or cell packs / stacks (referred to here as cell packs), resulting in relatively high forces that cannot be counteracted due to a lack of suitable points of application on the cell.In practice, gap filler injection or compression currently creates a buoyancy effect on the cells that cannot be counteracted. Particularly with pouch cells, this can lead to cell damage due to their geometry.
[0036] Such a pouch cell, although preferably intended to be used as a battery cell 18 within the scope of the invention, is, for example, in Fig. 4 shown. Fig. Figure 4 shows a schematic top view of an end face 18a of such a pouch cell. The representation can, for example, be used as a top view along the y-axis, as is also shown, for example, in Fig. The top surface 18b of such a cell defines a region of the top surface 16a of the cell pack 16. Similarly, a bottom surface 18c of the cell defines a part of the bottom surface 16b of the cell pack 16. Pouch cells typically have protruding, sometimes irregularly shaped, connection points 22 in the edge region, which can, for example, represent folded or crimped edges. This results in an uneven geometry of the first and second sides 16a, 16b of the cell pack 16. If pressure is now exerted on such a cell from one side, its opposite side with the connection point 22 would be pressed against the corresponding housing wall, causing local pressure and potentially damaging the cell. The invention advantageously reduces, if not eliminates, the probability of such damage. This will now be demonstrated using the following: Fig. 1, Fig. 2 to Fig. 3 explains this in more detail. This can advantageously be achieved by applying the thermal conductivity 24 as uniformly as possible to both sides 16a, 16b of the cell pack 16. In other words, the thermal conductivity 24 is applied to both sides simultaneously or at least overlapping in time. This allows the cells to be kept in mechanical equilibrium, and, most importantly, prevents any local forces from acting on them. The gap filler material ensures a uniform distribution of force across the contact surfaces of the cells, thereby minimizing the local pressure on the cells. Fig. Figure 1 shows the injection process, as already described, at a first time step t1. Fig. 2 to a later second time step t2 and Fig. 3 to a later time step t3. The injection takes place through at least one injection opening 26 on a first housing side 14a, and through at least one housing opening 28 on the second housing side 14b. Furthermore, an injection device 30 can be used for the injection, which moves to both sides of the respective openings 26, 28 and can, for example, be designed in the form of a nozzle or syringe, and injects the thermal conductivity 24 under an adjustable filling pressure. In the present example, the thermal conductivity 24 is injected in the first time step t1 with a first filling pressure p1, in the second time step t2 with a second filling pressure p2, and in the third time step t3 with a third filling pressure p3. Furthermore, in the first time step t1, the area of the cell pack 16 wetted by the thermal conductivity 24 is designated A1, in the second time step t2 with A2, and in the third time step t3 with A3.Although, for example, the filling pressure p1 and the area A1 are designated the same for the first time interval t1, this is not necessarily the case for the top and bottom surfaces. Ideally, at least the product of filling pressure and area should be the same for the top and bottom surfaces 16a, 16b. In other words, the following should apply: p(O)⋅A(O)=p(U)⋅A(U). Here, p denotes the injection pressure and A the area of the respective cell pack side 16a or 16b wetted by the thermal conductivity 24. O represents the top side 16a and U the bottom side 16b of the cell pack. This equality should apply at least approximately for each time step of the injection process in order to achieve the most ideal force distribution possible on the battery cells 18. To ensure this, injection can be performed based on experimentally determined injection parameters or by means of a control system. In the latter case, it is advantageous, for example, to monitor the injection state on the respective side and to make adjustments, such as to the injection pressure or the volume flow rate, depending on a difference between the two sides 16a and 16b.
[0037] Fig. Figure 4 shows, as already described, a pouch cell. This cell typically has a thickness of, for example, 15.6 mm in the y-direction and a height h in the z-direction of, for example, between 100 and 101 mm. The protruding connection points 22 can initially be disregarded. These each have a height in the range of 2 to 3 mm. In this example, the connection point 22 on the underside 18c has a height H1 of 3 mm, and the connection point 22 on the opposite side 18b has a height H2 of 2 mm. The distance between the highest point of the connection point 22 on the top side 18b and the first housing side 14a can be, for example, 1 to 2 mm and is denoted here by d1, while the corresponding dimension on the underside 18c is denoted by d2 and can be, for example, only 0.7 mm.To fill these first and second cavities 20a, 20b with the thermal conductivity 24, a relatively large amount of such thermal conductivity 24 would be required without further measures. To reduce the amount of cavity 20a, 20b to be filled, the inner surface of the first and / or second housing side 14a, 14b can, for example, be designed with a geometry corresponding to the battery cells 18, for example with a type of groove structure, such as that shown in [reference]. Fig. Figure 4 shows the underside 14b. This underside, which has a grooved structure, is specifically designated 14c. Only a single groove 32 is shown here, which corresponds in its geometry to the connection point 22 on the underside 18c of cell 18.
[0038] The top side, i.e. the first housing side 14a, can also be designed with a corresponding geometry in order to advantageously reduce the required amount of thermal conductivity 24.
[0039] Furthermore, it shows Fig. Figure 5 shows a schematic and perspective view of a battery module 12 according to an embodiment of the invention. The first housing side 14a is shown in particular from the outside. This side has several filling openings 34 distributed across it, only some of which are marked with a reference numeral for clarity. These openings are preferably not located along the same line, so that no predetermined breaking point is created. By providing several such filling openings 34, a gentler and faster filling of the thermal interface material 24 can be achieved. Additionally, the first housing side 14a has vent openings 36, again only some of which are marked with a reference numeral for clarity. The air displaced during the filling process can escape from these vent openings 36. The second housing side 14b can be configured accordingly, although it is not shown here.When the thermal conductivity compound 24 is injected through these filling openings 34, it distributes itself evenly above and below in the various free spaces 20a, 20b. In the present case, in . Fig. In the example shown, flow fronts form from the filling openings 34 in and against the y-direction, eventually meeting at the front and rear edges of the housing 14 with respect to the y-direction shown. The vent holes 36 shown are therefore located at the theoretical ends of the respective flow fronts. This allows the respective free spaces 20a and 20b to be completely filled, as these vent openings 36 can be kept clear of the gap filler for as long as possible.
[0040] Overall, the examples show how the invention can provide a double-sided gap filler injection, which enables a particularly gentle introduction of a thermal conductivity material into a battery module, thus preventing possible damage to pouch cells.
Claims
[1] Method for introducing a first thermal conductivity material (24) into at least one first free space (20a) in a battery module (12), comprising the steps: - Providing the battery module (12) with a module housing (14) and a cell pack (16) arranged in the module housing (14) with at least one battery cell (18), wherein the module housing (14) has a first housing side (14a) and a second housing side (14b) opposite the first housing side (14a), wherein the cell pack (16) has a first side (16a) facing the first housing side (14a) and a second side (16b) opposite the first side (16a) facing the second housing side (14b), wherein the cell pack (16) is arranged in the housing such that there is a first free space (20a) between the first side (16a) of the cell pack (16) and the first housing side (14a) and there is a second free space (20b) between the second side (16b) and the second housing side (14b); and - Pouring the first thermal conductivity compound (24) into the first free space (20a); - wherein, overlapping in time with the filling of the first thermal conductivity material (24) into the first free space (20a), a second thermal conductivity material (24) is filled into the second free space (20b), characterized by , that the first thermal conductivity compound (24) is filled into the first free space (20a) through at least one first filling opening (26, 28, 34) in the first housing side (14a) and the second thermal conductivity compound (24) is filled into the second free space (20b) through at least one second filling opening (26, 28, 34) in the second housing side (14b). [2] Method according to claim 1, characterized by , that when providing the battery module (12) the cell pack (16) with at least one pouch cell, preferably several pouch cells, is provided as the at least one battery cell (18). [3] Method according to any one of the preceding claims, characterized by, that the first free space (20a) has several first sub-areas arranged next to each other perpendicular to a first direction (z), and the second free space (20b) has several second sub-areas arranged next to each other perpendicular to the first direction (z), wherein each first sub-area is assigned to a second sub-area and is arranged in the first direction (z) above the assigned second sub-area, wherein the first and second thermal conductivity (24) are filled in such a way that each of the first sub-areas is filled with the first thermal conductivity (24) in a time overlapping manner with the filling of the second thermal conductivity (24) into the assigned second sub-area. [4] Method according to any one of the preceding claims, characterized by, that during the filling of the first and second thermal conductivity (24) a current filling state of the first and second free space (20a, 20b) is detected and the filling of the first and / or second thermal conductivity (24) is controlled depending on the respective current filling states. [5] Method according to claim 4, characterized by , that the quantity of first and / or second thermal conductivity (24) filled into the first and / or second free space (20a, 20b) per unit of time is controlled depending on a determined difference between the current filling state of the first free space (20a) and the current filling state of the second free space (20b). [6] Method according to any one of the preceding claims, characterized by, that the first thermal conductivity compound (24) is filled into the first free space (20a) through several first filling openings (26, 28, 34) in the first housing side (14a) at least overlapping in time, in particular simultaneously, and that the second thermal conductivity compound (24) is filled into the second free space (20b) through several second filling openings (26, 28, 34) in the second housing side (14b) at least overlapping in time, in particular simultaneously. [7] Injection arrangement (10) for introducing a first thermal conductivity material (24) into at least one first free space (20a) in a battery module (12), wherein the injection arrangement (10) comprises: - a battery module (12) with a module housing (14) and a cell pack (16) arranged in the module housing (14) with at least one battery cell (18), wherein the module housing (14) has a first housing side (14a) and a second housing side (14b) opposite the first housing side (14a), wherein the cell pack (16) has a first side (16a) facing the first housing side (14a) and a second side (16b) opposite the first side (16a) facing the second housing side (14b), wherein the cell pack (16) is arranged in the housing such that there is a first free space (20a) between the first side (16a) of the cell pack (16) and the first housing side (14a) and a second free space (20b) between the second side (16b) and the second housing side (14b); - an injection device (30) designed to inject the first thermal conductivity compound (24) into the first free space (20a); - wherein the injection device (30) is designed to inject the first thermal conductivity material (24) into the first free space (20a) and a second thermal conductivity material (24) into the second free space (20b) in a temporally overlapping manner, characterized by , that the injection device (30) is designed to inject the first thermal conductivity material (24) through at least one first filling opening (26, 28, 34) in the to fill the first housing side (14a) into the first free space (20a) and to fill the second thermal conductivity compound (24) through at least a second Filling opening (26, 28, 34) in the second housing side (14b) into the second free space (20b). [8] Injection arrangement (10) according to claim 7, characterized by , that the cell pack (16) comprises several battery cells (18) designed as pouch cells, which are arranged next to each other in a second direction (x) perpendicular to a first direction (z) from the second housing side (14b) to the first housing side (14a). [9] Injection arrangement (10) according to claim 8, characterized by , that the first and / or the second housing side (14a, 14b) has a groove structure with several grooves (32) running parallel to each other in a third direction (y), wherein the third direction (y) is perpendicular to the first and second directions (z, x).