Battery module assembly, and method of attaching circuit board of battery management system to battery module assembly

Abstract

To provide a battery module assembly and an assembly method for a circuit board of a battery management system in the battery module assembly, which enable a space-optimized positioning of a circuit board of a battery monitoring unit.SOLUTION: A battery module assembly includes: a first battery module (8) and a second battery module (9), each including one or more battery cells; a circuit board of a battery monitoring unit; and a retaining element (16) which has a receptacle in which the circuit board is arranged, where the retaining element (16) is arranged between the first battery module (8) and the second battery module (9).SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a battery module assembly with a holding element for a circuit board of a battery monitoring unit and a method for assembling a circuit board of a battery management system on said battery module assembly. [Background technology]

[0002] A battery module assembly spatially combines multiple battery modules, often arranged within a housing that also contains other components such as cable harnesses and battery monitoring electronics.

[0003] [Patent Document 1] (International Publication WO2010 / 040520A2) discloses an automotive battery with four battery modules and integrated cell monitoring, where the four battery modules are arranged directly adjacent to each other and the cell monitoring electronics are arranged on one of the battery modules.

[0004] German Patent Application DE 10 2010 014 905 A1 discloses an energy storage cell unit which comprises six energy storage cell units arranged next to one another, on which a CSE circuit board 28 with the corresponding control electronics is arranged. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. WO2010 / 040520A2 [Patent Document 2] German Patent Application Publication No. DE102010014905A1 Summary of the Invention [Problem to be solved by the invention]

[0006] It is an object of the present invention to provide a battery module assembly which allows a space-optimized positioning of the circuit board of a battery monitoring unit, and a method for assembling the circuit board of a battery management system in said battery module assembly. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention proposes a battery module assembly comprising a battery module, a circuit board of a battery monitoring unit, and a holding element having a receiving portion on which the circuit board is arranged, the battery module including a first battery module and a second battery module, each of the battery modules including one or more battery cells, and the holding element being arranged between the first battery module and the second battery module.

[0008] In one possible embodiment of the invention, the holding element can be made of foamed plastic. This foamed plastic can in particular be expanded polypropylene (EPP). Foamed plastic, in particular EPP, can be manufactured with good tolerances, has a certain elasticity and can be easily localized formed. This means that by using foamed plastic, the holding element can be easily attached to the battery module assembly with high positional accuracy between the battery modules over a long service life. Furthermore, foamed plastic has a very low density, which offers a significant weight advantage over, for example, metal holding elements. Furthermore, foamed plastic has a high damping constant, which allows the holding element made of foamed plastic to damp vibrations on the circuit board.

[0009] In another possible embodiment, the holding element can have a recess as a receiving part into which the circuit board is inserted, in particular the circuit board can be arranged in the recess without projecting from the first battery module towards the second battery module and / or vice versa.

[0010] Furthermore, the circuit board can be attached to the holding element by one or more fastening elements, which can be expansion dowels with elastic extensions, which can be placed in holes in the holding element.

[0011] In yet another possible embodiment, the holding element may have a first battery module contact surface facing the side wall of the second battery module and a second battery module contact surface facing the side wall of the first battery module.

[0012] The first battery module contact surface and the second battery module contact surface can be arranged laterally, in particular orthogonally, to the first battery module contact surface and / or the second battery module contact surface, at least in their overlapping portions. Alternatively or in combination therewith, the first battery module contact surface and the second battery module contact surface can be arranged laterally, in particular orthogonally, to the sidewall of the first battery module and / or the sidewall of the second battery module, at least in their overlapping portions.

[0013] In the state where the holding element is not attached, the distance from the first battery module contact surface to the second battery module contact surface in a direction perpendicular to the first battery module contact surface and the second battery module contact surface can be equal to or greater than the distance between the first battery module and the second battery module in the same direction. Alternatively or in combination with this, in the state where the holding element is not attached, the distance from the first battery module contact surface to the second battery module contact surface is equal to or greater than the distance from the first battery module to the second battery module in a direction perpendicular to the side wall of the first battery module and / or the side wall of the second battery module. In other words, the distance from the first battery module contact surface to the second battery module contact surface can be equal to or greater than the distance formed between the first battery module and the second battery module.

[0014] In yet another possible embodiment, the holding element can have a first positioning portion including a first height positioning surface and a first side positioning surface. The first battery module contact surface, the first height positioning surface and the first side positioning surface can be arranged perpendicular to each other. Alternatively, or in combination therewith, the holding element can have a second positioning portion including a second height positioning surface and a second side positioning surface. The second battery module contact surface, the second height positioning surface and the second side positioning surface can be arranged perpendicular to each other. The first height positioning surface and the second height positioning surface can be arranged parallel to each other, in particular the first height positioning surface and the second height positioning surface can lie in a common plane.

[0015] Furthermore, the holding element may include a base contact surface arranged parallel to the first height positioning surface and / or the second height positioning surface. A distance from the base contact surface to the first height positioning surface may be equal to or greater than a height of the second battery module. Alternatively or in combination, a distance from the base contact surface to the second height positioning surface may be equal to or greater than a height of the first battery module.

[0016] In yet another possible embodiment, the first and second side locating surfaces can be disposed parallel to each other and in opposite directions toward each other, and the distance from the first to the second side locating surfaces can be equal to or greater than the common width of the first and second battery modules.

[0017] In yet another possible embodiment, the battery module assembly can include a first battery module, a second battery module, and a housing with an interior space in which the holding element is arranged. In particular, the holding element can have an end face arranged parallel to the base contact surface. This end face can be in direct or indirect contact with the cover of the housing. The distance between the end face and the base contact surface can be equal to or greater than the height of the interior space. In other words, the holding element can be inserted into the housing under a preload.

[0018] In a further possible embodiment, the holding element has a holding part, the free end of which extends along the longitudinal axis of the holding part. The holding part can have a recess in which the electronic component is arranged. The recess can be designed as a first groove extending parallel to the longitudinal axis of the holding part. A second groove can be formed in the holding part in the circumferential direction around the longitudinal axis of the holding part, in which an annular fastening element is arranged, which connects the electronic component to the holding part.

[0019] To solve the problem, the present invention also proposes a method for mounting a circuit board of a battery management system in a battery module assembly, the method comprising the steps of mounting a first battery module and a second battery module to a base element of a housing along a longitudinal axis such that a gap is formed between the first battery module and the second battery module, mounting the circuit board to a retaining element, and inserting the retaining element into the gap and moving the retaining element from a position outside the gap towards the base element in a radial plane relative to the longitudinal axis.

[0020] The assembly method of the present invention is particularly applicable to the battery module assembly of the above embodiment.

[0021] In yet another possible embodiment, the assembly method of the present invention may comprise the following steps: connecting a cover of the housing to a base element to form an internal space between the base element and the cover, positioning therein a first battery module, a second battery module and a holding element together with a circuit board, and simultaneously clamping the holding element between the base element and the cover.

[0022] Hereinafter, possible embodiments of a battery module assembly according to the present invention and an assembly method according to the present invention will be described with reference to the drawings. [Brief description of the drawings]

[0023] [Figure 1] 1 is a perspective view of a battery module assembly according to the present invention with the cover removed; [Diagram 2] FIG. 1 shows the retaining element in its pre-assembly position. [Diagram 3] FIG. 2 is a top view of the battery module assembly of FIG. 1 with the cover removed. [Figure 4] 2 is a cross-sectional view of the battery module assembly of FIG. 1 taken along a section through a first retaining element when the cover is attached; FIG. [Diagram 5]In the perspective view of the first retaining element of FIG. 1, the circuit board is shown in a position prior to being attached to the retaining element. [Figure 6] 2 is a perspective view of the first retaining element of FIG. 1 with a circuit board attached thereto; [Figure 7] FIG. 2 is a front view of the first retaining element of FIG. 1 when no circuit board is present. [Figure 8] FIG. 2 is a rear view of the first retaining element of FIG. 1 with a circuit board attached thereto; [Figure 9] FIG. 2 is a plan view of the first retaining element of FIG. 1; [Figure 10] FIG. 2 is a perspective cross-sectional view of the rear of the first retaining element of FIG. 1; [Figure 11] 4 is a flow chart of a method for assembling a circuit board of a battery management system to a battery module assembly. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] 1 to 10 show a battery module assembly 1 of the present invention, which will be described below. The battery module assembly 1 is composed of a housing 2 having a base element 4 and a cover 6, which together define an interior space 3 of the housing 2. Four battery modules are arranged in the housing 2, although the number of battery modules is not limited thereto. The battery modules include one or more battery cells, which are connected to each other via a high-voltage wiring harness, not shown.

[0025] The battery modules are arranged in pairs, a first battery module 8, 8' and a second battery module 9, 9'. The first battery module 8, 8' and the second battery module 9, 9' have the same design and are arranged rotated 180° relative to each other. In particular, the arrangement of the modules can be exactly one first battery module 8 and one second battery module 9.

[0026] The first battery module 8, 8' and the second battery module 9, 9' are arranged adjacent to each other along the longitudinal axis L of the battery module assembly 1. The first and second battery modules 8, 8', 9, 9' are arranged alternately. The first and second battery modules 8, 8', 9, 9' each have a flat side wall facing the other battery module. The side wall is arranged perpendicular to the longitudinal axis L. In other words, the side wall defines a plane perpendicular to the longitudinal axis L. A gap is formed between the first battery module 8, 8' and the adjacent second battery module 9, 9', and a holding element 16, 16' is arranged in each gap. The first holding element 16 is arranged between the first battery module 8 and the second battery module 9, and the second holding element 16' is arranged between the first battery module 8' and the second battery module 9'.

[0027] The first retaining element 16 and the second retaining element 16' are identical, and therefore these two components will be described together below with reference to the first retaining element 16.

[0028] As can be seen in particular in FIG. 2, when mounting the retaining element 16, the retaining element 16 is moved in a plane perpendicular to the longitudinal axis L of the battery module assembly 1 in a direction towards the base element 4 of the housing 2 and is inserted between the first battery module 8 and the second battery module 9. This assembly movement is indicated by arrows in FIG. 2. The retaining element 16 is pushed into said gap until the base contact surface 26 of the retaining element 16 contacts the base surface 5 of the base element 4. Alternatively, the retaining element 16 is pushed into said gap until it rests on either the first or the second battery module.

[0029] The holding element 16 consists of a body 17 made of expanded plastic. In this case, in particular, the body 17 is made of expanded polypropylene (EPP).

[0030] The retaining element 16 has a central recess 18 in which the circuit board 11 of the battery management system 10 is placed. The circuit board 11 is attached to the retaining element 16 by means of one or more fastening elements 19. In the illustrated example the fastening elements 19 are designed as expansion dowels which extend into holes 20 in the retaining element 16.

[0031] The circuit board 11 of the first holding element 16 is connected to the first battery module 8 and the second battery module 9 via a first cable harness. The first wire harness has a connector for the first battery module 8 and a connector for the second battery module 9, and the cell voltage and cell temperature of each battery module are detected via these. The circuit board 11 of the first holding element 16 is connected to the circuit board 11 of the second holding element 16' via a second wire harness. The circuit board 11 of the first holding element 16 and the circuit board 11 of the second holding element 16' can communicate with each other and with the central module of the battery monitoring unit via the second wire harness.

[0032] The holding element 16 has a first battery module contact surface 21 facing away from the second battery module 9. This first battery module contact surface 21 contacts a side wall of the second battery module 9. This first battery module contact surface 21 lies in a plane perpendicular to the longitudinal axis L. In this case, the first battery module contact surface 21 is a closed surface surrounding the recess 18. It is also conceivable for the first battery module contact surface 21 to consist of several partial surfaces which are spatially separated from one another and lie in a common plane.

[0033] The holding element 16 has a second battery module contact surface 22 facing away from the first battery module 8. This second battery module contact surface 22 contacts a side wall of the first battery module 8. This second battery module contact surface 22 lies in a plane perpendicular to the longitudinal axis L. In the illustrated example, the second battery module contact surface 22 is composed of a first closed partial surface 22' and a second closed partial surface 22'', each of which lies in a plane.

[0034] The first battery module contact surface 21 and the second battery module contact surface 22 are arranged parallel to each other. The first battery module contact surface 21 and the second battery module contact surface 22 at least partially overlap in a direction parallel to the longitudinal axis L.

[0035] The distance between the first battery module contact surface 21 and the second battery module contact surface 22 in a direction parallel to the longitudinal axis L when the holding element 16 is mounted is equal to the distance between the first battery module 8 and the second battery module 9 in the same direction. The holding element 16 is arranged snugly between the first battery module 8 and the second battery module 9 in the direction parallel to the longitudinal axis L.

[0036] With the retaining element 16 unattached, the second battery module contact surface 22 has a first thickness in a direction parallel to the longitudinal axis L in the region of the second partial surface 22''. In other words, this thickness is applied to the second partial surface 22'' in a direction perpendicular to the plane associated with the second battery module contact surface 22. In this case, the thickness of the partial surface 22'' is wedge-shaped. The amount of thickness of the partial surface 22'' increases as the distance from the base contact surface 26 of the retaining element 16 increases.

[0037] The circuit board 11 is disposed within the recess 18 so as not to protrude relative to a plane associated with the first battery module contact surface 21 and a plane associated with the second battery module contact surface 22 .

[0038] When the retaining element 16 is inserted into the gap between the first battery module 8 and the second battery module 9, said thickness is deformed or compressed, and the area of ​​thickness forms a surface in the plane of the second battery module contact surface 22. The retaining element 16 is sandwiched (clamped) between the first battery module 8 and the second battery module 9. The retaining element 16 is arranged in a plane perpendicular to the longitudinal axis L and is frictionally engaged between the first battery module 8 and the second battery module 9.

[0039] It will be appreciated that both the first battery module contact surface 21 and the second battery module contact surface 22 may have one or more of the above thicknesses, and in the illustrated example, the second thickness is provided in the area designated by reference character 22' in FIG.

[0040] The holding element 16 has a first positioning portion 23 and a second positioning portion 23'. The first positioning portion 23 has a height positioning surface 24. The height positioning surface 24 is arranged parallel to the base contact surface 26. The height positioning surface 24 lies in a plane parallel to the longitudinal axis L. The second battery module 9 has a support surface 12 which is in contact with the height positioning surface 24 of the holding element 16.

[0041] The distance between the height positioning surface 24 of the first positioning portion 23 and the base contact surface 26 when the holding element 16 is not attached is greater than or equal to the distance between the support surface 12 of the second battery module 9 and the base surface 5 of the base element 4.

[0042] The first positioning portion 23 also comprises a side positioning surface 25. This side positioning surface 25 is arranged perpendicular to the height positioning surface 24. The side positioning surface 25 lies in a plane parallel to the longitudinal axis L. The second battery module 9 has a side contact surface 13 which contacts the side positioning surface 25 of the holding element 16.

[0043] The first positioning portion 23 further constitutes a part of the first battery module contact surface 21. The height positioning surface 24 and the side positioning surface 25 are perpendicular to the first battery module contact surface 21, respectively.

[0044] The second positioning portion 23' has a height positioning surface 24'. This height positioning surface 24' is arranged parallel to the base contact surface 26. The height positioning surface 24' lies in a plane parallel to the longitudinal axis L. The first battery module 8 has a support surface 12' which is in contact with the height positioning surface 24' of the holding element 16. The planes of the height positioning surface 24 of the first positioning portion 23 and the height positioning surface 24' of the second positioning portion 23' are arranged parallel to each other, in particular are identical.

[0045] When the holding element 16 is not attached, the distance between the height positioning surface 24' of the second positioning portion 23' and the base contact surface 26 is greater than or equal to the distance between the support surface 12' of the first battery module 8 and the base surface 5 of the base element 4.

[0046] The second positioning portion 23' also comprises a side positioning surface 25' which is arranged perpendicular to the height positioning surface 24'. The side positioning surface 25' lies in a plane parallel to the longitudinal axis L. The first battery module 8 has a side contact surface 13' which contacts the side positioning surface 25 of the holding element 16.

[0047] The side positioning surface 25 of the first positioning portion 23 and the side positioning surface 25' of the second positioning portion 23' are disposed in opposite directions and face each other.

[0048] When the holding element 16 is not attached, the distance between the side positioning surface 25 of the first positioning portion 23 and the side positioning surface 25' of the second positioning portion 23 is greater than or equal to the distance between the side contact surface 13' of the first battery module 8 and the side contact surface 13 of the second battery module 9.

[0049] The second positioning portion 23' further constitutes a part of the second battery module contact surface 22. The height positioning surface 24' and the side positioning surface 25' are each perpendicular to the second battery module contact surface 22'.

[0050] The retaining element 16 has an end surface 27 in contact with the cover surface 7 of the cover 6. In the unattached state of the retaining element 16, the end surface 27 has a distance from the base contact surface 26 that is equal to or greater than the distance between the base surface 5 of the base element 4 and the cover surface 7 of the cover 6 in the assembled state. The relevant cover surface can be formed by the cover 6 itself, for example as shown in FIG. 4. Alternatively, the cover 6 can comprise one or more additional intermediate elements arranged between the retaining element 16 and the cover element shown in FIG. 4.

[0051] In the illustrated example, the end surface 27 is composed of four partial surfaces 27', 27''', 27''', 27'''', each of which lies in a common plane and is in contact with the cover surface 7. These four partial surfaces 27', 27''', 27''', 27'''', are distributed over the width of the holding element 16.

[0052] The first partial surface 27' is formed by the first positioning portion 23 and the fourth partial surface 27'''' is formed by the second positioning portion 23'. The second partial surface 27'' is formed by the free end of the first beam portion of the holding element 16. The third partial surface 27''' is formed by the free end of the second beam portion of the holding element 16.

[0053] The retaining element 16 is sandwiched between the base element 4 and the cover 6. For that purpose, the retaining element 16 is inserted into the gap between the first battery module 8 and the second battery module 9, after which the cover 6 is placed on the base element 4 and clamped together using a screw connection. Between the base element 4 and the cover 6 the retaining element 16 is slightly compressed. Due to the elasticity of the foamed plastic, any oversizing or undersizing between the retaining element 16, the first battery module 8, the second battery module 9 and the housing 2 is compensated. In this way the retaining element 16 together with the circuit board 11 is firmly arranged in the housing 2.

[0054] The second partial surface 27'' and the first thickness lie in a common first clamping surface, which is arranged orthogonally to the first battery module contact surface 21 and / or the second battery module contact surface 22. The third partial surface 27''' and the second thickness lie in a common second clamping surface, which is arranged orthogonally to the first battery module contact surface 21 and / or the second battery module contact surface 22. The recess 18 or the circuit board 11 is at least partially arranged between the first clamping surface and the second clamping surface.

[0055] The retaining element 16 further has a retaining portion 28 extending along a longitudinal body axis L_28 having a free end. The retaining portion 28 is formed with a first groove 29 extending along the longitudinal axis of the body axis L_28. An electronic component, for example one of the termination resistors 15 of the above-mentioned wire harness, can be placed in the first groove 29.

[0056] A second groove 30 is formed in the holding part 28, which at least partially surrounds the longitudinal axis of the body axis L_28 in an annular manner. A ring-shaped fastening element 31 is arranged in this second groove 30, which completely surrounds the longitudinal axis of the body axis L_28 for fastening the electronic component 15 in the first groove 29. This fastening element 31 can be designed, for example, as a cable tie.

[0057] The retaining element 16 may have a fastener 14 by means of which the elements of the wire harness can be fixed to the retaining element 16. The fastener 14 may be in the form of a lamellar clip with anti-rotation protection which is inserted into a hole in the retaining element 16. The lamellar clip passes through the hole and can fit tightly against the retaining element 16 with an undercut.

[0058] Cooling channels for cooling the battery module assembly 1 are integrated into the base element 4 and / or the cover 6 .

[0059] The flow chart of FIG. 11 is used to explain a method for assembling the circuit boards of a battery management system within a battery module assembly.

[0060] In a first step V10, a first battery module 8 and a second battery module 9 are attached to the base element 4 of the housing 2 along the longitudinal axis L, forming a gap between the first battery module 8 and the second battery module 9. In particular, the battery modules 8, 9 are fixed to the base element 4.

[0061] In step V20, the circuit board 11 is attached to the holding element 16.

[0062] In a next step V30, the retaining element 16 is pressed into the gap, and the retaining element 16 moves in the radial plane from a position outside the gap towards the base element. In particular, when the retaining element 16 is inserted into the gap, the retaining element 16 clamps the first battery module 8 and the second battery module 9 simultaneously.

[0063] The retaining element 16 is forced into the gap until the retaining element 16 contacts the base contact surface 26 of the base surface 5 of the base element 4. Alternatively, the retaining element 16 is forced into the gap until the retaining element 16 contacts the height positioning surface 24 of the support surface 12 of the first or second battery module 8, 9.

[0064] In a further step V40, the cover 6 of the housing is connected to the base element 4. Between the cover 6 and the base element 4 an interior space 2 is formed, in which the first battery module 8, the second battery module 9 and the holding element 16 are arranged together with the circuit board 11. In particular, the holding element 16 is clamped between the base element 4 and the cover 6 during step V40. [Explanation of symbols]

[0065] 1 Battery Module Assembly 2. Housing 3. Interior space 4 Base Elements 5 Base surface 6 Cover 7 Cover surface 8. First Battery Module 9 Second Battery Module 10 Battery Management System 11 Circuit Board 12 Support surface 13 Side contact surface 14 Fixtures 15 Termination resistor 16 Retention elements 17 Main unit 18 Recess 19 Fixed elements 20 holes 21 Battery module contact surface 22 Battery module contact surface 23 Positioning section 24 Height positioning surface 25 Side positioning surface 26 Base contact surface 27 End face 28 Holding part 29 Groove 30 grooves 31 Fixed elements

Claims

1. A battery module assembly including a first battery module (8) and a second battery module (9) each including one or more battery cells, a circuit board (11) of a battery monitoring unit (10), and a holding element (16) having a receiving portion in which the circuit board (11) is placed, A battery module assembly, characterized in that a holding element (16) is arranged between a first battery module (8) and a second battery module (9).

2. 2. A battery module assembly according to claim 1, characterized in that the holding element (16) is made of foamed plastic, in particular expanded polypropylene (EPP).

3. 3. The battery module assembly according to claim 1 or 2, characterized in that the holding element (16) has a recess (18) as the receiving portion into which the circuit board (11) is inserted, and the circuit board (11) is arranged in the recess (18) without protruding, in particular without protruding in a direction from the first battery module (8) towards the second battery module (9).

4. 4. The battery module assembly according to claim 1, wherein the circuit board (11) is fixed to the holding element (16) by means of a fastening element (19).

5. 5. The battery module assembly according to claim 4, characterized in that the fastening element (19) is an expansion dowel having an elastic extension, said extension being disposed in a hole (20) of the holding element (16).

6. 6. The battery module assembly according to claim 1, wherein the holding element (16) has a first battery module contact surface (21) facing the second battery module (8) and the holding element (16) has a second battery module contact surface (22) opposite the first battery module (9), the first battery module contact surface (21) and the second battery module contact surface (22) being arranged transversely to the first battery module contact surface (21) and / or the second battery module contact surface (22) and at least partially overlapping each other.

7. 7. The battery module assembly according to claim 6, characterized in that, when the holding element (16) is not attached, the distance between the first battery module contact surface (21) and the second battery module contact surface (22) is equal to or greater than the distance between the first battery module and the second battery module in a direction perpendicular to the first battery module contact surface (21) and / or the second battery module contact surface (22).

8. 8. The battery module assembly according to claim 6 or 7, characterized in that the holding element (16) has a first positioning portion (23) including a first height positioning surface (24) and a first side positioning surface (25), and the first battery module contact surface (21), the first height positioning surface (24) and the first side positioning surface (25) are arranged perpendicular to each other, and / or the holding element (16) has a second positioning portion (23') including a second height positioning surface (24') and a second side positioning surface (25'), and the second battery module contact surface (22), the second height positioning surface (24') and the second side positioning surface (25') are arranged perpendicular to each other.

9. 9. The battery module assembly according to claim 8, characterized in that the first and second height positioning surfaces (24) and (24') are arranged parallel to each other, in particular lying in a common plane, the holding element (16) has a base contact surface (26) arranged parallel to the first and second height positioning surfaces (24) and (24'), the distance of the base contact surface (26) from the first height positioning surface (24) being equal to or greater than the height of the second battery module (9) and / or the distance of the base contact surface (26) from the second height positioning surface (24') being equal to or greater than the height of the first battery module (8).

10. 10. The battery module assembly according to claim 8 or 9, characterized in that the first side positioning surface (25) and the second side positioning surface (25') are arranged parallel to each other and oriented toward each other in opposite directions, and the distance between the first side positioning surface (25) and the second side positioning surface (25') is greater than or equal to the common width of the first battery module (8) and the second battery module (9).

11. 11. The battery module assembly according to claim 9 or 10, wherein the battery module assembly (1) comprises a first battery module (8), a second battery module (9), and a housing (2) having an interior space (3) in which a holding element (16) is arranged.

12. The battery module assembly according to any one of claims 1 to 11, characterized in that the holding element (16) has a holding portion (28) having a free end extending along a longitudinal axis (L_28) of the holding portion, the holding portion (28) having a recess (29) in which the electronic component (15) is arranged.

13. 13. A battery module assembly according to claim 12, characterized in that the recess (29) is designed as a first groove extending parallel to the longitudinal axis (L_28) of the holding part, and in the holding part (28) a second groove (30) is formed in the circumferential direction around the longitudinal axis (L_28) of the holding section, and in the second groove (30) an annular fastening element (31) is arranged, which connects the electronic component (15) to the holding section (28).

14. A method for mounting a circuit board of a battery management system to a battery module assembly, in particular a battery module assembly according to any one of claims 1 to 13, comprising the following steps (V10) to (V30): (V10): Attaching the first battery module (8) and the second battery module (9) to the base element (4) of the housing (2) along the longitudinal axis (L) such that a gap is formed between the first battery module (8) and the second battery module (9); (V20): Attaching the circuit board (11) to the holding element (16); (V30): Insert the retaining element (16) into the gap and move the retaining element (16) in a radial plane from a position outside the gap in a direction towards the base element (4).

15. 15. The method according to claim 14, characterized in that: (V40): Connect the cover (6) of the housing (2) to the base element (4), form an internal space (3) between the base element (4) and the cover (6), and place the first battery module (8), the second battery module (9), and the holding element (16) together with the circuit board (11) therein, and simultaneously clamp the holding element (16) between the base element (4) and the cover (6).

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