Pre-assembly unit for a battery, and an assembly method for a battery

Abstract

The invention relates to a pre-assembly unit for a battery, comprising at least the following components: - a cell stack with at least one battery cell and a fastening surface by means of which the cell stack can be fastened to a housing; and - at least one adhesive layer attached to the attachment surface of the cell stack, with an adhesive surface on the housing side arranged on the side facing away from the cell stack, The pre-assembly unit is designed to be inserted into a housing of the battery in an insertion direction and to be bonded to the housing by means of the adhesive layer in an adhesive direction transverse to the insertion direction. The pre-assembly unit is characterized primarily in that the pre-assembly unit has a release agent that is freely movable with respect to the adhesive layer along an insertion direction on the housing side of the adhesive layer. A pre-assembly unit for a battery is proposed which enables particularly simple bonding of a cell stack in a housing.

Description

The invention relates to a pre-assembly unit for a battery, a pre-assembly set with such a pre-assembly unit for a battery, and an assembly method for a battery.Batteries, for example traction batteries for motor vehicles, have a plurality of battery cells which are connected to one another in parallel or in series. In this case, a plurality of battery cells are arranged in cell stacks. The cell stacks are in turn arranged in module housings and / or battery housings. A battery comprises, for example, a plurality of corresponding battery modules or cell stacks.In this case, a secure connection of the cell stacks to the housing is necessary in order to prevent the battery cells from slipping with respect to the corresponding housing, for example in the event of severe accelerations of the motor vehicle, shocks or crashes.The cell stacks are inserted into the housing during assembly. An adhesive layer is arranged on one side of the cell stack. For adhesive bonding, the cell stack is pressed with the adhesive layer against the housing. For this purpose, for example, a spring element is arranged on that side opposite the adhesive layer or battery cells are compressed by the housing under prestress along the pressing direction in such a way that a corresponding pressing force is provided as a result.Due to the relative movements between the housing wall and the cell stack during the insertion of the cell stack or adhesive layer, it is not possible to insert the cell stack without stripping off the adhesive or, in the case of a double-sided adhesive tape, without the cell stack adhering directly at the beginning of the housing and positioning into the end position being made more difficult or impossible.Proceeding from this, the object of the present invention is to overcome at least partially the disadvantages known from the prior art. The features according to the invention are evident from the independent claims, for which advantageous embodiments are shown in the dependent claims. The features of the claims can be combined in any technically expedient manner, wherein the explanations from the following description and features from the figures, which comprise supplementary configurations of the invention, can also be used for this purpose.The invention relates to a pre-assembly unit for a battery, comprising at least the following components:a cell stack having at least one battery cell and a fastening surface, by means of which the cell stack can be fastened to a housing; andat least one adhesive layer fastened to the fastening surface of the cell stack, having a housing-side adhesive surface arranged on the sides facing away from the cell stack,wherein the pre-assembly unit is designed to be inserted into a housing of the battery in an insertion direction and to be bonded to the housing by means of the adhesive layer in an adhesive direction transverse to the insertion direction.The preassembly unit is above all characterized in that the preassembly unit has a separating means which is freely movable with respect to the adhesive layer along an insertion direction on the housing side of the adhesive layer.Ordinal numbers used in the preceding and following description, unless expressly stated to the contrary, serve only for the clear distinguishability and do not represent an order or ranking of the designated components. An ordinal number greater than one does not require that a further such component must necessarily be present.Here, a pre-assembly unit for a battery, for example a lithium ion battery, is proposed. Such a battery is, for example, a traction battery of a motor vehicle. The pre-assembly unit has a cell stack and an adhesive layer.The cell stack comprises at least one battery cell, preferably a plurality of battery cells. Preferably, a plurality of battery cells are stacked to form a cell stack. Particularly preferably, the battery cells of a cell stack are arranged in a stacked manner along the adhesive direction.The cell stack further comprises a fastening surface on one side in the direction of the adhesive direction. Preferably, the fixing surface is formed of the battery cell which is the outermost battery cell in the direction of the adhesion direction. It should be noted that in this disclosure, the phrase in one direction or opposite a direction is used to define a unique direction, while the phrase along a direction is used to define only an orientation parallel to the direction. The insertion direction represents the direction in which the pre-assembly unit is inserted into a housing during assembly. The adhesive direction is arranged transversely, preferably orthogonally, to the insertion direction and represents the direction in which the cell stack is pressed by means of the adhesive layer during adhesive bonding. The transverse direction is transverse, preferably orthogonal, to the insertion direction and the adhesion direction.Preferably, the at least one battery cell is a rigid battery cell. Such a battery cell preferably has a rigid cell housing. For example, the battery cell is a prismatic cell.The adhesive layer has an adhesive surface on the housing side. The housing-side adhesive surface is arranged on a side of the adhesive layer which points away from the cell stack. The housing-side adhesive surface thus points in the direction of the adhesive direction. The adhesive layer is arranged and fastened, preferably bonded, to the fastening surface of the cell stack.Preferably, the adhesive layer has two adhesive surfaces which are arranged on both sides of the adhesive layer along the adhesive direction. Thus, a battery-side adhesive surface is oriented in the direction of the cell stack and the housing-side adhesive surface is oriented in the direction of the adhesive direction, and thus in an assembled state in the direction of the housing wall, by means of which the adhesive layer is to be bonded. The battery-side adhesive surface is thus preferably in contact with the fastening surface.For example, the adhesive layer is a double-sided adhesive tape or other adhesive. For example, the adhesive is a multicomponent adhesive or a thermal adhesive.The pre-assembly unit is designed to be inserted into a housing of the battery in the insertion direction during assembly. Such a housing is, for example, a battery housing or a battery module housing. During the assembly of the battery, a plurality of cell stacks or pre-assembly units are preferably inserted into a battery module housing or a battery housing. For example, a plurality of battery module housings are subsequently assembled to form a battery.Furthermore, the cell stack is designed to be glued in the housing during assembly, in a fixed end position. For this purpose, the cell stack is preferably pressed against a housing wall along the adhesive direction, so that the cell stack is bonded to the housing wall by means of the adhesive layer. The contact pressure force is preferably applied to a pressure surface of the cell stack, which is preferably arranged opposite and particularly preferably parallel to the fastening surface.The pre-assembly unit now further comprises a separating means that is freely movable along the insertion direction. The separating agent is freely movable on the housing side of the adhesive layer. This means that the separating agent is arranged such that it is movable on the side of the adhesive layer facing away from the cell stack, i.e. the side with the housing-side adhesive surface.Freely movable in the present disclosure means that the separating means is movable without considerable resistance. For this purpose, the separating agent is preferably arranged and designed such that it is movable along the insertion direction without overcoming an adhesive force with respect to the adhesive layer.Accordingly, the separating means is designed to pass the adhesive layer and the housing wall, to which the adhesive layer is bonded after insertion into the housing, from one another. Preferably, the release agent is not in direct contact with the adhesive layer.For example, a cover layer is arranged on the adhesive layer for this purpose. The covering layer is arranged in such a way that it is arranged between the adhesive layer and the separating agent during a movement of the separating agent along the insertion direction, for example during insertion. For example, the separating means and the covering layer are connected to one another at one end along the insertion direction, preferably at the insertion-side end of the pre-assembly unit, which is first pushed into the housing. The separating agent and the covering layer are preferably connected to one another in such a way that the covering layer can be removed from the adhesive layer by means of the separating agent, for example after the pre-assembly unit has been inserted into the housing.Alternatively or additionally, the separating agent is in contact with the cell stack, for example with the fastening surface of the cell stack, in regions at which the adhesive layer is recessed.For example, the separating means is guided along the insertion direction.The pre-assembly unit proposed here enables simple and secure assembly of cell stacks in housings.It is furthermore proposed in an advantageous embodiment of the pre-assembly unit that the separating agent is formed by means of a folded section of a separating film, wherein a contact section of the separating film is fastened to the fastening surface of the cell stack by means of the adhesive layer.According to the embodiment proposed here, the separating agent is designed as a folded section of a separating film. The release film includes a contact portion adjacent to the folding portion. The contact section is arranged on the fastening surface of the cell stack by means of the adhesive layer. Preferably, the contact portion is a capping layer as described above.The housing-side adhesive surface is preferably covered by the contact section at least in the regions in which the release film would otherwise come into contact with the adhesive surface when the preassembly unit is inserted into the housing. For this purpose, the contact section is preferably formed as one or more film tracks along the insertion direction, wherein the film tracks continue in the form of the separating film and are exactly as wide or narrower in the region of the separating film in the transverse direction orthogonal to the adhesive direction and the insertion direction than in the region of the contact section.Preferably, the contact portion is at least as wide as the adhesive layer along the transverse direction and at least as long as the adhesive layer along the insertion direction, so that the entire adhesive layer is covered by the contact portion.The contact section is thus arranged in such a way that it is arranged between the adhesive layer and the release agent during a movement of the release agent along the adhesive layer, for example during insertion. For example, the separating means and the contact section are connected to one another at one end along the insertion direction, preferably at the insertion-side end. Preferably, the separating agent and the contact section are connected to one another in such a way that the contact section can be pulled off from the adhesive layer by means of the separating agent, for example after the pre-assembly unit has been inserted into the housing.It is furthermore proposed in an advantageous embodiment of the pre-assembly unit that the folding section is at least partially unfolded or rolled up at an insert-side end along the insertion direction of the pre-assembly unit.According to this embodiment, the folding section, i.e. the separating means, is now rolled up or unfolded at an insertion-side end of the pre-assembly unit before the pre-assembly unit is inserted into the housing. The folding section is preferably folded open or rolled up in such a way that, when the pre-assembly unit is inserted, the folding section is rolled off or unfolded. For example, for this purpose, an outer-side end of the folding section, which is arranged opposite an insertion-side end of the folding section, by means of which the folding section is fastened to the contact section, can be held firmly from outside the housing during insertion.It is furthermore proposed in an advantageous embodiment of the pre-assembly unit that the separating means is a spacer, wherein the spacer has at least one spacer strut which is arranged extending through an adhesive layer along the adhesive direction.According to the embodiment proposed here, the separating means is a spacer.The spacer has at least one spacer strut. The spacer bar is arranged to extend through the adhesive layer along the adhesion direction. Preferably, the at least one spacer is not in contact with the adhesive layer, so that no adhesive effect is present between the spacer and the adhesive layer. The spacer is thus designed to space the adhesive layer on the cell stack from the housing or the housing wall, respectively, when the pre-assembly unit is inserted, to which the adhesive layer is bonded during assembly.The spacer is preferably arranged and designed in such a way that the spacer can be moved counter to the insertion direction without coming into contact with the adhesive layer.The spacer preferably has a plurality of spacer struts. Preferably, the spacer struts are spaced apart from one another along the transverse direction. For example, the spacer comprises at least one connecting strut, by means of which the spacer struts are connected. For example, at least one of the connecting struts is arranged at a distance along the adhesion direction from the adhesive layer, on the housing side. When the pre-assembly unit is inserted, the connecting strut is thus arranged between the housing wall, to which the adhesive layer is bonded, and the adhesive layer and is spaced apart from the adhesive layer by the spacer struts. Alternatively or additionally, at least one of the connecting struts is arranged along the insertion direction at an outer-side end, i.e. opposite the insertion-side end, of the pre-assembly unit.For example, the spacer is preferably guided along the insertion direction by means of the spacer struts, for example by means of at least one rail. For example, the spacer is guided on the housing and / or on the cell stack.It is furthermore proposed in an advantageous embodiment of the pre-assembly unit that the at least one spacer strut of the spacer is arranged laterally of the adhesive layer along the transverse direction; preferably, the at least one spacer strut of the spacer is arranged between two adhesive layers in each case along the transverse direction.According to this embodiment, the at least one spacer strut of the spacer is arranged or guided along the transverse direction laterally of the adhesive layer. For example, two spacer struts are arranged along the transverse direction on both sides of the adhesive layer.In one exemplary embodiment, the pre-assembly unit has a plurality of adhesive layers. In other words, the adhesive layer consists of a plurality of separate tracks. For example, such traces of the adhesive layer or such adhesive layers are arranged parallel to one another and spaced apart from one another along the transverse direction. In such an embodiment, the spacer struts are now arranged or guided between the tracks or adhesive layers, so that the spacer struts can be moved along the insertion direction without coming into contact with the adhesive layer.It is furthermore proposed in an advantageous embodiment of the pre-assembly unit that the separating agent is at least as long as the adhesive layer along the insertion direction.According to this embodiment, the release agent is at least as long as the adhesive layer. For a release film, this means that the folded section in a folded-out state, for example after insertion of the pre-assembly unit into the housing, is at least as long as the adhesive layer. Preferably, the folded portion of such a release film is longer than the adhesive layer and the contact portion of the release film.By means of this embodiment, when the preassembly unit is inserted into the housing, the separating film can be arranged in a double layer between the adhesive layer and the housing or the housing wall, with which the adhesive layer is bonded. Preferably, a protrusion of the folding section protrudes from the housing at the outside end. After the pre-assembly unit has been inserted into the housing, the separating film can thus be removed by means of the folding section, for example by being pulled on the protrusion.It is furthermore proposed in an advantageous embodiment of the pre-assembly unit that a compression spring is arranged on a pressure surface of the battery cell opposite the fastening surface.According to this embodiment, a compression spring is now arranged on a pressure surface of the cell stack. For example, the compression spring is a foam element, a disk spring or another restoring element. The pressure surface is preferably formed by an outermost battery cell along the adhesive direction, which is arranged on the side of the cell stack facing away from the adhesive layer. Preferably, the compression spring presses the cell stack against the housing, preferably against a housing wall which lies opposite the housing wall to which the adhesive layer is bonded.Alternatively or additionally, such a compression spring is fastened to the housing, preferably to the corresponding housing wall.Furthermore alternatively or additionally, the cell stack is inserted into the housing in a state pretensioned along the adhesive direction. That is, the cell stack is compressed along the adhesive direction when it is inserted into the housing. The contact pressure force is thus provided by means of the elastic restoring force of the cell stack.According to a further aspect, a pre-assembly set for a battery is proposed, comprising at least the following components:at least one pre-assembly unit according to an embodiment according to the above description;at least one housing which is designed to receive the pre-assembly unit by means of insertion and has at least one housing wall which is designed to be bonded to the cell stack by means of the adhesive layer.The pre-assembly set for a battery proposed here comprises at least one pre-assembly unit according to the preceding description and a housing.The pre-assembly set preferably comprises a plurality of such pre-assembly units.The at least one housing is designed to receive the pre-assembly unit by means of insertion. Furthermore, the housing has at least one housing wall which is designed in such a way that the cell stack of the inserted preassembly unit can be fastened to the housing wall by means of the adhesive layer.The housing is, for example, a battery housing or a battery module housing. The housing is preferably designed to accommodate a plurality of cell stacks. For example, at least one cell stack can be pushed into the housing from opposite sides. The housing preferably comprises a stop which limits the insertion of the pre-assembly unit at a defined end position along the insertion direction. In a housing into which at least one cell stack can be inserted from each of the two opposite sides, preferably both end positions of the cell stacks are defined by means of a common stop, which is preferably arranged centrally in the housing along the insertion direction.Furthermore, a plurality of cell stacks can preferably be accommodated in a common housing along the transverse direction and / or adhesive direction.The housing is preferably tunnel-shaped. In this case, the housing has an insertion opening at at least one end along the insertion direction, which insertion opening allows the preassembly unit to be inserted into the tunnel. Preferably, at least one housing wall of the tunnel, preferably a lower housing wall, is designed to be bonded with the adhesive layer. Preferably, the opposite housing wall, preferably the upper housing wall, forms a counter support surface for the contact pressure force, for example for the compression spring.Preferably, the housing has a rectangular or cuboidal cross section as viewed in the direction of insertion. The housing is preferably a profile housing.According to a further aspect, a mounting method for a battery is proposed, comprising the following steps: a. providing a pre-mounting unit according to an embodiment according to the above description; b. inserting the pre-mounting unit along an insertion direction into a housing; c. removing the separating agent from the housing along the insertion direction; d. pressing the housing-side adhesive surface against a complementary housing wall of the housing along the adhesive direction and thus fastening the cell stack in the housing.The battery mounting method proposed here comprises the steps a., b., c. and d. explained below.In step a., at least one pre-assembly unit is provided as described above. Preferably, a plurality of such pre-assembly units are provided. Preferably, a pre-assembly set as described above is provided.In step b., the pre-assembly unit is inserted into a housing along the insertion direction according to the above description. When the pre-assembly unit is inserted into the housing, contact does not occur between the adhesive layer of the pre-assembly unit and the housing. Thus, the pre-assembly unit can be easily inserted into the housing along the insertion direction.In step c., the separating means of the pre-assembly unit is removed from the housing. For this purpose, the separating agent is preferably removed counter to the insertion direction. Alternatively, the separating means is removed, for example, along the insertion direction. Thus, the housing-side adhesive surface of the adhesive layer is exposed. When the separating means according to an embodiment is configured as described above, the separating means is removable with low force.In step d., the adhesive layer with the housing-side adhesive surface is pressed against a complementary housing wall of the housing. The cell stack is thus fixed in the housing. For example, the pressing is effected by means of the compression spring or by an elastic restoring force of the cell stack.It is furthermore proposed in an advantageous embodiment of the assembly method that the removal of the separating agent in step c. takes place counter to the insertion direction.The invention described above is explained in detail below in view of the relevant technical background with reference to the associated drawings, which show preferred embodiments. The invention is in no way limited by the purely schematic drawings, it being noted that the drawings are not dimensionally accurate and are not suitable for defining size ratios. It is shown in FIG. 1 : a cross section of a pre-assembly set with a separating film before assembly in a schematic illustration; FIG. 2 is a cross-section of the pre-assembly set according to FIG. 1 during assembly; FIG. 3 : a cross section of the pre-assembly set according to FIG. 1 after assembly; FIG. 4 : a cross section of a pre-assembly set with a spacer before assembly in a schematic illustration; FIG. 5 : shows the pre-assembly unit according to FIG. 4 in a cross-sectional view with viewing direction in the insertion direction; FIG. 6 : shows the pre-assembly unit according to FIG. 4 in a schematic plan view; FIG. 7 is a cross-section of the pre-assembly set according to FIG. 4 during assembly; and FIG. 8 : shows a cross section of the pre-assembly set according to FIG. 4 after assembly.FIG. 1 shows a cross section of a pre-assembly set 22 with a separating film 14 before assembly in a schematic illustration. The pre-assembly set 22 includes a pre-assembly unit 1 and a housing 6.Both pre-assembly units 1 can be pushed into the housing 6 along an insertion direction 7. Arranged orthogonally to the insertion direction 7 is an adhesive direction 11, as shown from top to bottom. Arranged orthogonally to the adhesive direction 11 and the insertion directions 7 is a transverse direction 19, as shown in the viewing direction.The housing 6 is a battery module housing having a plurality of cell stack receptacles 25. Further cell stack receptacles 25 are provided, for example, along the transverse direction 19 and are correspondingly concealed. Along the insertion direction 7, a stop 24 is arranged centrally in the housing 6, which defines an end position of the pre-assembly units 1 along the insertion direction 7.The insertion directions 7 of the two pre-assembly units 1 are opposite in the illustration, so that, in the illustration, the left pre-assembly unit 1 can be inserted into the housing 6 from left to right and the right pre-assembly unit 1 can be inserted from right to left.For the sake of clarity, the components of the pre-assembly unit 1 are marked on the right pre-assembly unit 1 as shown, and the relevant surfaces of the pre-assembly unit 1 on the left pre-assembly unit 1 as shown.The preassembly unit 1 comprises a compression spring 21, a cell stack 3, an adhesive layer 8 and a separating film 14. the separating film 14 comprises a folding section 13 and a contact section 15. the folding section 13 forms a separating agent 12 which is freely movable along the insertion direction 7 below the contact section 15 when the preassembly unit 1 is inserted.The cell stack 3 comprises a plurality of battery cells 4, which are stacked one above the other along the adhesive direction 11 as shown. The cell stack 3 has a fastening surface 5, to which the adhesive layer 8 is fastened. According to the illustration, the fastening surface 5 is thus formed on the underside of the cell stack 3 of the lowermost battery cell 4.The adhesive layer 8 has a battery-side adhesive surface 9 and a housing-side adhesive surface 10. According to the illustration, the battery-side adhesive surface 9 is thus arranged on the upper side of the adhesive layer 8 and the housing-side adhesive surface 10 is arranged on the lower side of the adhesive layer 8. For example, the adhesive layer 8 is a two-sided adhesive tape or another adhesive.The contact portion 15 is arranged and fastened on the housing-side adhesive surface 10 and thus covers the housing-side adhesive surface 10. At an insertion-side end 16 of the pre-assembly unit 1, i.e. the end 16 of the pre-assembly unit 1 along the insertion direction 7, which is first introduced into the housing 6, the separating film 14 merges from the contact section 15 into the folding section 13. The folding section 13 is unfolded in sections according to the illustration. An outer end 26 of the folding section 13 is not folded and can also be held securely from the outside when it is inserted into the housing 6. The folding section 13 or the separating means 12 is thus freely movable with respect to the cell stack 3 and the adhesive layer 8 along the insertion direction 7.On a pressure surface 20 opposite the fastening surface 5, a compression spring 21 is arranged.FIG. 2 shows a cross section of the pre-assembly set 22 according to FIG. 1 during assembly. In contrast to FIG. 1, the pre-assembly units 1 are now inserted into the housing 6. Along the adhesion direction 11, the pre-assembly unit 1 is elastically compressed, substantially via compression of the compression spring 21, to fit into the housing 6. Accordingly, the pre-mounting unit 1 is held by the housing 6 in such a pre-tensioned state.During the insertion, the folded section 13 of the separating film 14 was unrolled. Thus, the folding section 13 now extends between the contact section 15 and the housing wall 23, by means of which the cell stack 3 is to be glued. The pre-assembly units 1 are now located in the defined end positions along the insertion direction 7 on the stop 24.FIG. 3 shows a cross section of the pre-assembly set 22 according to FIG. 1 after assembly. In contrast to FIG. 2, the separating film 14 is now removed from the pre-assembly unit 1. The removal of the separating film 14 takes place counter to the insertion direction 7.Thus, the housing-side adhesive surface 10 now abuts on the complementary housing wall 23 of the housing 6, by means of which the cell stack 3 is bonded. The restoring force applies a pressing force to the pressure surface 20 of the cell stack 3. Thus, the cell stack 3 and the adhesive layer 8 are pressed against the corresponding housing wall 23. The cell stack 3 is thus bonded to the housing wall 23.FIG. 4 shows a cross section of a pre-assembly set 22 with a spacer 17 before assembly in a schematic illustration. The preassembly set 22 corresponds substantially to the preassembly set 22 according to FIG. 1 and differs only in the separating means 12. according to FIG. 4, the separating means 12 is a spacer 17. the spacer 17 has a plurality of spacer struts 18, which extend through the adhesive layer 8 along the adhesion direction 11 and thus space the adhesive layer 8 from the housing 6 or the housing wall 23, respectively, to which the cell stack 3 is adhered, during insertion.The spacer 17 is designed to be guided on the housing wall 23 of the housing 6 along the insertion direction 7. The spacer struts 18 are arranged between tracks of the adhesive layer 8 and are in contact between these tracks with the fastening surface 5 of the cell stack 3.FIG. 5 shows the pre-assembly unit 1 according to FIG. 4 in a cross-sectional view with the viewing direction in the insertion direction 7. It can be seen here that the spacer 17 spaces the adhesive layer 8 from the housing wall 23. The spacer struts 18 each run laterally, or between, individual tracks of the adhesive layer 8 in this case. The spacer 17 can thus be pulled out of the housing 6 counter to the insertion direction 7, after the cell stack 3 has been positioned in the housing 6, without the spacer 17 adhering to the adhesive layer 8.FIG. 6 shows the pre-assembly unit 1 according to FIG. 4 in a schematic plan view. The viewing direction is here from bottom to top as shown. It can be seen how the spacer struts 18 are spaced apart from one another in the transverse direction 19 and run along the insertion direction 7 between the tracks of the adhesive layer 8. Vent recesses 27 for discharging hot gases of the cell stack 3 are arranged in the adhesive layer 8 in the event of a fault.FIG. 7 shows a cross section of the pre-assembly set 22 according to FIG. 4 during assembly. As in FIG. 2, the pre-assembly unit 1 has now been moved into the end position. In this case, the distance between the adhesive layer 8 and the housing wall 23 is maintained by means of the spacer 17.FIG. 8 shows a cross section of the pre-assembly set 22 according to FIG. 4 after assembly. As in FIG. 3, the spacer 17 is now removed from the pre-assembly unit 1. In this case, the spacer 17 can be easily removed from the pre-assembly unit 1, since the spacer struts 18 run in the adhesive layer 8 in the exceptions. Thus, there is no adhesive contact between the adhesive layer 8 and the spacer 17.A pre-assembly unit for a battery is proposed, which makes possible a particularly simple adhesive bonding of a cell stack in a housing.List of reference characters1 Preassembly unit 2 Battery 3 Cell stack 4 Battery cell 5 Fastening surface 6 Housing 7 Insertion direction 8 Adhesive layer 9 Battery-side adhesive surface 10 Housing-side adhesive surface 11 Adhesive direction 12 Separating agent 13 Folding section 14 Separating film 15 Contact section 16 Housing-side end 17 Spacer 18 Spacer strut 19 Transverse direction 20 Pressure surface 21 Compression spring 22 Preassembly set 23 Housing wall 24 Stop 25 Cell stack receiving means 26 Outer-side end 27 Vent recesses

Claims

Pre-assembly unit (1) for a battery (2), comprising at least the following components: - a cell stack (3) with at least one battery cell (4) and a fastening surface (5), by means of which the cell stack (3) can be fastened to a housing (6); and - at least one adhesive layer (8) fastened to the fastening surface (5) of the cell stack (3), having a housing-side adhesive surface (10) arranged on the sides facing away from the cell stack, wherein the pre-assembly unit (1) is designed to be inserted into a housing (6) of the battery (2) in an insertion direction (7) and to be bonded to the housing (6) by means of the adhesive layer (8) in an adhesive direction (11) transversely to the insertion direction (7), characterized in that the pre-assembly unit (1) has a separating agent (12) which is freely movable with respect to the adhesive layer (8) along an insertion direction (7) on the housing side of the adhesive layer (8).The pre-assembly unit (1) according to claim 1, wherein the separating means (12) is formed by means of a folded portion (13) of a separating film (14), wherein a contact portion (15) of the separating film (14) is fastened to the fastening surface (5) of the cell stack (3) by means of the adhesive layer (8).The pre-assembly unit (1) according to claim 1 or claim 2, wherein the folding section (13) is at least partially folded open or rolled up at an insert-side end (16) along the insertion direction (7) of the pre-assembly unit (1).The pre-assembly unit (1) according to claim 1, wherein the separating means (12) is a spacer (17), wherein the spacer (17) comprises at least one spacer strut (18), which is arranged extending along the adhesion direction (11) through adhesive layer (8).The pre-assembly unit (1) according to claim 4, wherein the at least one spacer strut (18) of the spacer (17) is arranged laterally of the adhesive layer (8) along the transverse direction (19), preferably the at least one spacer strut (18) of the spacer (17) is arranged between two adhesive layers (8) each along the transverse direction (19).The pre-assembly unit (1) according to any one of the preceding claims, wherein the separating means (12) is at least as long as the adhesive layer (8) along the insertion direction (7).The pre-assembly unit (1) according to any one of the preceding claims, wherein a compression spring (21) is arranged on a pressure surface (20) of the battery cell (4) opposite the fastening surface (5).A pre-assembly set (22) for a battery (2), comprising at least the following components: - at least one pre-assembly unit (1) according to one of the preceding claims; - at least one housing (6) which is configured to receive the pre-assembly unit (1) by means of insertion and comprises at least one housing wall (23) which is configured to be bonded to the cell stack (3) by means of the adhesive layer (8).Mounting method for a battery (2), comprising the following steps: a. providing a pre-mounting unit (1) according to one of Claim 1 to Claim 7; b. inserting the pre-mounting unit (1) into a housing (6) along an insertion direction (7); c. removing the separating agent (12) from the housing (6) along the insertion direction (7); d. pressing the housing-side adhesive surface (10) against a complementary housing wall (23) of the housing (6) along the adhesive direction (11) and thus fastening the cell stack (3) in the housing (6).Assembly method according to Claim 9, wherein the removal of the separating means (12) in step c. takes place counter to the insertion direction (7).

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