Battery module and electric device

Abstract

The utility model discloses a battery module, including end board, side plate and dismounting structure, end board with side plate passes through dismantling structure is detachably connected, be equipped with the blocking piece on end board for preventing external force to press dismantling structure, the utility model discloses realized the detachable connection of end board and side plate, improved dismounting convenience, the utility model discloses still discloses a kind of electric device.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery module and an electrical device. Background Technology

[0002] Existing technologies use end plates and side plates to fix the stacked cells in the battery module. However, the end plates and side plates are mostly connected and fixed by welding. This method makes disassembly difficult, inconvenient for module maintenance, and requires a large investment in production and processing costs. Utility Model Content

[0003] To address the problem of difficult assembly and disassembly caused by the welding method used to fix the end plate and side plate of the battery module, the purpose of this utility model is to provide a battery module that solves the above problem, realizes the detachable connection of the end plate and side plate, and improves the convenience of assembly and disassembly.

[0004] This utility model provides a battery module, including an end plate, a side plate, and a disassembly structure. The end plate and the side plate are detachably connected through the disassembly structure. The end plate is provided with a stop to prevent external force from pressing on the disassembly structure.

[0005] In one embodiment, the battery module includes a cell assembly, the cell assembly including a plurality of cells, the cells having a thickness direction, and the plurality of cells of the cell assembly arranged along the thickness direction; an end plate is disposed on the outside of the cell assembly along the thickness direction; a stop is disposed on the side of the end plate away from the cell assembly along the thickness direction, and a disassembly / assembly structure is detachably connected to the side of the end plate away from the cell assembly along the thickness direction; along the thickness direction, the distance from the side of the stop away from the cell assembly to the cell assembly is not less than the distance from the side of the disassembly / assembly structure away from the cell assembly to the cell assembly.

[0006] In one embodiment, the disassembly structure includes fasteners and / or snap-fit ​​components.

[0007] In one embodiment, the disassembly structure includes fasteners, the fasteners including bolts, the bolts being used to detachably connect the end plate and the side plate; both the end plate and the side plate are provided with disassembly holes that mate with the bolts.

[0008] In one embodiment, the end plate has an assembly surface, an assembly boss is provided on the assembly surface, and a disassembly hole is provided on the end plate at the assembly boss.

[0009] In one embodiment, the stop includes a baffle connected to the end plate, the baffle including a through hole for hoisting and / or fixing the battery module.

[0010] In one embodiment, the stop further includes a support plate, the support plate having two adjacent surfaces, one surface of which is connected to the stop plate and the other surface of which is connected to the end plate.

[0011] In one embodiment, the battery module includes a cell assembly, which includes a plurality of cells. The cells have a first direction, a second direction, and a thickness direction that are perpendicular to each other. The plurality of cells in the cell assembly are arranged along the thickness direction. Each cell has a tab located at the end of the cell along the first direction. The cell assembly has end plates on both sides along the thickness direction and side plates on both sides along the second direction.

[0012] In one embodiment, each end plate is provided with two stops, which are symmetrically arranged relative to the middle section of the end plate perpendicular to the second direction.

[0013] In one embodiment, the side plate includes a main body and two bent portions connected to the main body; the main body is disposed on the outside of the cell assembly along the second direction, and the two end plates are detachably connected to the two bent portions of the side plate one-to-one through the disassembly and assembly structure; along the thickness direction, the bent portions are connected to the side of the end plate away from the cell assembly.

[0014] In one embodiment, the end plate has an assembly surface away from the cell assembly along the thickness direction, the stop is disposed on the assembly surface, and an assembly boss is provided on the assembly surface; along the thickness direction, the disassembly structure is detachably connected to the side of the assembly boss away from the cell assembly.

[0015] In one embodiment, along the thickness direction, the distance from the side of the stop away from the assembly surface to the assembly surface is not less than the distance from the side of the disassembly structure away from the assembly surface to the assembly surface.

[0016] In one embodiment, the end plate has components on the assembly surface, and along the thickness direction, the distance from the side of the stop away from the assembly surface to the assembly surface is not less than the distance from the side of the component away from the assembly surface to the assembly surface.

[0017] This utility model also provides an electrical device comprising the battery module described above.

[0018] The beneficial effects of this utility model are as follows: the end plate and the side plate are detachably connected by the disassembly structure, which is easier to assemble and fix than welding, and helps to reduce production and processing costs and assembly process difficulty; the disassembly structure realizes the detachable connection of the end plate and the side plate, improves the convenience of disassembly and assembly, and facilitates module maintenance; the end plate is provided with a stop to prevent the disassembly structure from being damaged by external pressure and improves connection stability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the battery module of this utility model.

[0021] Figure 2 yes Figure 1 Partial disassembly diagram.

[0022] Figure 3 yes Figure 1 A partial schematic diagram.

[0023] Figure 4 yes Figure 3 A diagram showing the area without a protective barrier.

[0024] Figure 5 yes Figure 3 A schematic diagram from another perspective, without the disassembly / reassembly structure.

[0025] Figure 6 yes Figure 5 A schematic diagram showing the installation and disassembly structure without a protective plate.

[0026] Figure 7 yes Figure 3 A side view diagram.

[0027] Figure 8 This is a structural diagram of the side panel.

[0028] Figure 9 This is a partial schematic diagram of the end plate.

[0029] In the diagram: 1. End plate; 11. Assembly surface; 111. Assembly boss; 2. Side plate; 21. Main body; 22. Bending part; 3. Disassembly and assembly structure; 4. Stop; 41. Baffle; 411. Through hole; 42. Support plate; 5. Components; 6. Cell assembly; 61. Cell; 611. Tab; 7. Protective plate; 8. Disassembly and assembly hole. Detailed Implementation

[0030] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of this utility model. Based on the description of this utility model, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0032] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar properties, not to indicate or imply relative importance or a specific order.

[0034] The terms “including,” “comprising,” or any other variations thereof are intended to cover a non-exclusive inclusion, which includes not only those elements listed but also other elements not expressly listed.

[0035] This utility model provides a battery module, such as Figures 1 to 3 As shown, it includes an end plate 1, a side plate 2, and a disassembly structure 3. The end plate 1 and the side plate 2 are detachably connected through the disassembly structure 3. The end plate 1 is provided with a stop 4 to prevent external force from pressing on the disassembly structure 3.

[0036] In this embodiment, the end plate 1 and the side plate 2 are detachably connected by the disassembly structure 3, which is easier to assemble and fix than welding, and helps to reduce production and processing costs and assembly process difficulty. The disassembly structure 3 realizes the detachable connection between the end plate 1 and the side plate 2, improves the convenience of disassembly and assembly, and facilitates module maintenance. The end plate 1 is provided with a stop 4, which can prevent the disassembly structure 3 from being damaged by external pressure and improve the connection stability.

[0037] As one implementation method, such as Figures 1 to 3As shown, the battery module includes a cell assembly 6, which includes multiple cells 61. Each cell 61 has a thickness direction D, and the multiple cells 61 of the cell assembly 6 are arranged along the thickness direction D. An end plate 1 is disposed on the outside of the cell assembly 6 along the thickness direction D. A stop 4 is disposed on the side of the end plate 1 away from the cell assembly 6 along the thickness direction D. A disassembly / assembly structure 3 is detachably connected to the side of the end plate 1 away from the cell assembly 6 along the thickness direction D. The distance from the side of the stop 4 away from the cell assembly 6 along the thickness direction D to the cell assembly 6 is not less than the distance from the side of the disassembly / assembly structure 3 away from the cell assembly 6. In this embodiment, the relationship between the distance from the side of the stop 4 away from the cell assembly 6 and the distance from the side of the disassembly / assembly structure 3 away from the cell assembly 6 is defined. This helps the stop 4 to bear external forces on behalf of the disassembly / assembly structure 3, preventing the disassembly / assembly structure 3 from being affected by external forces and thus affecting the connection stability of the end plate 1 and the side plate 2, achieving reliable physical isolation and protection.

[0038] As one implementation, the disassembly / assembly structure 3 includes fasteners (such as...) Figure 3 (as shown) and / or snap-fit ​​connectors (not shown), the fastener connection is more reliable and the snap-fit ​​connectors are easier to install and remove; by providing a variety of options, the design flexibility is enhanced to adapt to different assembly scenarios.

[0039] As one implementation method, such as Figure 3 As shown, the disassembly structure 3 includes fasteners, including bolts, which are used to detachably connect the end plate 1 and the side plate 2. Compared with snap-fit ​​connections, bolted connections have the advantages of simple structure, stable connection, and convenient assembly and disassembly, ensuring a stable connection between the end plate 1 and the side plate 2, while also facilitating disassembly and assembly operations during later maintenance. Specifically, the bolts are used to detachably connect the end plate 1 and the bent portion 22 of the side plate 2 described below.

[0040] As one implementation method, such as Figure 5 , Figure 8 and Figure 9 As shown, both end plate 1 and side plate 2 are provided with mounting holes 8 for bolt engagement. The bolt engagement with the mounting holes 8 allows for a tight connection between end plate 1 and side plate 2. Specifically, at least the mounting holes 8 on end plate 1 are threaded holes. After the bolt passes through side plate 2, the engagement with the threaded hole on end plate 1 directly achieves a tight connection between end plate 1 and side plate 2. Alternatively, after the bolt passes through the mounting holes 8 on end plate 1 and side plate 2, a nut is screwed in to lock end plate 1 and side plate 2. The mounting holes 8 on side plate 2 are located on the bent portion 22 of side plate 2, as described below.

[0041] As one implementation method, such as Figure 5 and Figure 6As shown, the end plate 1 has an assembly surface 11, on which an assembly boss 111 (protruding outward from the assembly surface 11 along a direction perpendicular to the assembly surface 11) is provided. The disassembly and assembly holes 8 on the end plate 1 are provided on the assembly boss 111. Thus, a deeper disassembly and assembly threaded hole can be provided on the end plate 1, thereby matching a longer bolt for fixing and improving the connection stability between the end plate 1 and the side plate 2.

[0042] As one implementation method, such as Figure 5 and Figure 6 As shown, the stop 4 includes a baffle 41 connected to the end plate 1. The baffle 41 includes a through hole 411 for hoisting and / or fixing the battery module. Thus, the module can be hoisted and transported by engaging a hook with the through hole 411. When the module is placed inside the battery pack, bolts can be used to connect the through hole 411 to the corresponding threaded hole inside the battery pack to install the module. The stop 4 serves multiple functions, including protecting the disassembly and assembly structure 3, hoisting the module, and fixing the module, reducing the need for separate hoisting and module installation structures, which helps to reduce module weight and lower costs.

[0043] As one implementation method, such as Figure 5 and Figure 6 As shown, the stop 4 also includes a support plate 42, which has two adjacent surfaces, one of which is connected to the stop 41 and the other is connected to the end plate 1. The support plate 42 enhances the connection strength between the stop 41 and the end plate 1, making the overall structure of the stop 4 more stable, improving its resistance to external forces, and ensuring effective protection of the disassembly and assembly structure 3.

[0044] As one implementation method, such as Figure 5 and Figure 6 As shown, the baffle 41 is connected to the vertical assembly surface 11 of the end plate 1, and the two adjacent surfaces of the support plate 42 are the top surface and the side surface, respectively. The top surface of the support plate 42 is connected to the bottom surface of the baffle 41, and the side surface of the support plate 42 is connected to the assembly surface 11.

[0045] As one implementation method, such as Figure 5 As shown, the stop 4 includes a plurality of support plates 42 arranged at intervals in sequence to improve the overall stability of the stop 4.

[0046] As one implementation method, such as Figures 1 to 6As shown, the battery module includes a cell assembly 6, which includes multiple cells 61. Each cell 61 has a first perpendicular direction X (e.g., length direction), a second perpendicular direction Y (e.g., width direction), and a thickness direction D. The multiple cells 61 of the cell assembly 6 are arranged along the thickness direction D. Each cell 61 has a tab 611 located at its end along the first direction X. End plates 1 are provided on both sides of the cell assembly 6 along the thickness direction D, and side plates 2 are provided on both sides along the second direction Y. In this embodiment, the multiple cells 61 are arranged along the thickness direction D to form the cell assembly 6. The end plates 1 and side plates 2 form a stable frame structure, which can prevent the expansion of the cell assembly 6 along the thickness direction D and improve the neatness of the arrangement of the multiple cells 61 in the second direction Y. The tabs 611 are located at the ends of the cells 61 along the first direction X, and the end plates 1 and side plates 2 do not interfere with the tabs 611, facilitating the arrangement of current collectors (not shown).

[0047] As one implementation method, such as Figure 2 and Figure 8 As shown, the side plate 2 includes a main body 21 and two bent portions 22 connected to the main body 21. The main body 21 is disposed on the outside of the cell assembly 6 along the second direction Y. The two end plates 1 are detachably connected to the two bent portions 22 of the side plate 2 in a one-to-one correspondence through the disassembly and assembly structure 3. Along the thickness direction D, the bent portions 22 are connected to the side of the corresponding end plate 1 away from the cell assembly 6. In this embodiment, the side plate 2 is formed by bending a flat plate and includes a main body 21 and two bent portions 22. The main body 21 is attached to the outside of the cell assembly 6 along the second direction Y, and the bent portions 22 wrap around the side of the end plate 1 away from the cell assembly 6 along the thickness direction D and are connected to the end plate 1. The two bent portions 22 of the side plate 2 are respectively connected to the two end plates 1. Thus, the two side plates 2 and the two end plates 1 together form a robust frame, greatly improving the overall structural stability of the module. The side plate 2 is connected to the end plate 1 through the bent portion 22 located on the side of the end plate 1 away from the cell assembly 6 along the thickness direction D, allowing the disassembly and assembly structure 3 to be connected to a larger surface of the end plate 1, improving the convenience and stability of the connection. The side plate 2 can be integrally bent, resulting in high structural strength and high production efficiency.

[0048] As one implementation method, such as Figures 2 to 6 and Figure 9As shown, the end plate 1 has an assembly surface 11 that is away from the cell group 6 along the thickness direction D. The baffle 4 is provided on the assembly surface 11. The assembly surface 11 is provided with an assembly boss 111. Along the thickness direction D, the bent part 22 of the side plate 2 is detachably connected to the side of the assembly boss 111 away from the cell group 6 through the disassembly structure 3. This embodiment has the following advantages: the stop 4 and the disassembly / assembly structure 3 are located on the same plane, which can provide the most direct and effective protection for the disassembly / assembly structure 3; the assembly surface 11 is the surface of the end plate 1 away from the cell group 6 along the thickness direction D, and the disassembly / assembly operations (such as tightening bolts and snapping) are all performed outside the module, making assembly and disassembly very convenient without touching the inside of the module. The disassembly / assembly structure 3 and the stop 4 do not interfere with the cell group 6. If the assembly surface 11 is the surface of the end plate 1 close to the cell group 6 along the thickness direction D, then the bent portion 22 of the side plate 2 needs to be located between the cell group 6 and the end plate 1. If the bolt is screwed from the outside of the end plate 1 to the bent portion 22, it is difficult to set a deep threaded hole in the thinner bent portion 22, resulting in unstable connection. If the bolt is screwed from the bent portion 22 to the end plate 1, the operation will be difficult due to the obstruction of the battery group during the assembly process. In this solution, the assembly surface 11 is the end plate 1 away from the cell group 6 along the thickness direction D. The surface of the end plate 1 is conducive to the convenient and stable connection between the end plate 1 and the bending part 22. The assembly surface 11 is the surface of the end plate 1 away from the cell group 6 along the thickness direction D. This surface is the large surface of the end plate 1, which is conducive to providing space for the setting of the assembly boss 111. When multiple battery modules are arranged together in the battery pack, the multiple battery modules are usually arranged along the second direction Y. If the assembly surface 11 is the surface of the end plate 1 along the second direction Y, a gap needs to be set between every two adjacent modules to accommodate the disassembly structure 3. When there are many modules to be arranged in the battery pack, the arrangement along the second direction Y will have a significant impact on the space utilization. However, if the assembly surface 11 is the surface of the end plate 1 along the thickness direction D, the battery pack only needs to leave space at the side end of each module along the thickness direction D to accommodate the disassembly structure 3, which is conducive to improving the structural compactness. In addition, there is a need to arrange busbars on the surface of the end plate 1 along the first direction X. This implementation method can also avoid affecting the arrangement of busbars.

[0049] As one implementation method, such as Figure 5 and Figure 7 As shown, along the thickness direction D, the distance from the side of the stop 4 away from the assembly surface 11 to the assembly surface 11 is not less than the distance from the side of the disassembly structure 3 away from the assembly surface 11 to the assembly surface 11. The disassembly structure 3 at the assembly surface 11 is easily affected by external forces along the thickness direction D during module movement and handling. In this embodiment, the dimensions of the stop 4 along the thickness direction D are quantitatively limited, which helps the disassembly structure 3 bear the external forces in the thickness direction D, preventing the disassembly structure 3 from being affected by external forces and thus affecting the connection stability of the end plate 1 and the side plate 2, achieving reliable physical isolation and protection.

[0050] As one implementation method, such asFigure 2 , Figure 5 and Figure 7 As shown, the end plate 1 has components 5 on the assembly surface 11. Along the thickness direction D, the distance from the side of the stop 4 away from the assembly surface 11 to the assembly surface 11 is not less than the distance from the side of the component 5 away from the assembly surface 11 to the assembly surface 11. The components 5 include the module's main busbar, sampling line connectors, etc. In this embodiment, the stop 4 can also provide a certain degree of protection for the components 5 on the assembly surface 11, preventing the components 5 from being damaged or failing due to external impacts, thereby improving the reliability and service life of the battery module. After assembling the end plate 1 with the cell group 6, the main busbar and sampling line connector are installed in sequence at the corresponding positions on the end plate 1; the side plate 2 is detachably connected to the end plate 1 after being aligned and placed, through the disassembly structure 3.

[0051] As one implementation method, such as Figures 3 to 6 and Figure 9 As shown, each end plate 1 is provided with two stops 4, which are symmetrically arranged relative to the middle section of the end plate 1 perpendicular to the second direction Y. The symmetrical arrangement ensures that the force points of the module are symmetrical during hoisting or installation, avoiding the generation of additional torque and ensuring the smooth hoisting and installation of the module. The symmetrical stops 4 can enhance the rigidity of the end plate 1 itself, prevent its deformation, and help improve the structural stability.

[0052] As one implementation method, such as Figure 1 As shown, the top of the battery module is equipped with a protective plate 7 for heat insulation and resistance to flame impact.

[0053] This utility model also provides an electrical device comprising the battery module described above.

[0054] The end plate 1 and side plate 2 of this utility model are detachably connected by the disassembly structure 3, which is easier to assemble and fix than welding, and helps to reduce production and processing costs and assembly process difficulty. The disassembly structure 3 realizes the detachable connection between the end plate 1 and the side plate 2, improves the convenience of disassembly and assembly, and facilitates module maintenance. The end plate 1 is provided with a stop 4, which can prevent the disassembly structure 3 from being damaged by external pressure and improve the connection stability.

[0055] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A battery module, characterized in that, It includes an end plate (1), a side plate (2) and a disassembly structure (3). The end plate (1) and the side plate (2) are detachably connected through the disassembly structure (3). The end plate (1) is provided with a stop (4) to prevent external force from pressing the disassembly structure (3).

2. The battery module as described in claim 1, characterized in that, The battery module includes a cell assembly (6), which includes multiple cells (61). Each cell (61) has a thickness direction (D), and the multiple cells (61) of the cell assembly (6) are arranged along the thickness direction (D). The end plate (1) is disposed on the outside of the cell assembly (6) along the thickness direction (D). The stop (4) is disposed on the side of the end plate (1) away from the cell assembly (6) along the thickness direction (D). The disassembly structure (3) is detachably connected to the side of the end plate (1) away from the cell assembly (6) along the thickness direction (D). The distance from the side of the stop (4) away from the cell assembly (6) along the thickness direction (D) to the cell assembly (6) is not less than the distance from the side of the disassembly structure (3) away from the cell assembly (6) to the cell assembly (6).

3. The battery module as described in claim 1, characterized in that, The disassembly / assembly structure (3) includes fasteners and / or snap-fit ​​components.

4. The battery module as described in claim 1, characterized in that, The disassembly structure (3) includes fasteners, the fasteners include bolts, the bolts are used to detachably connect the end plate (1) and the side plate (2); both the end plate (1) and the side plate (2) are provided with disassembly holes (8) that cooperate with the bolts.

5. The battery module as described in claim 4, characterized in that, The end plate (1) has an assembly surface (11), and an assembly boss (111) is provided on the assembly surface (11). The disassembly and assembly holes (8) on the end plate (1) are provided on the assembly boss (111).

6. The battery module as described in claim 1, characterized in that, The baffle (4) includes a baffle (41) connected to the end plate (1), and the baffle (41) includes a through hole (411) for hoisting and / or fixing the battery module.

7. The battery module as described in claim 6, characterized in that, The baffle (4) also includes a support plate (42), which has two adjacent surfaces, one of which is connected to the baffle (41) and the other of which is connected to the end plate (1).

8. The battery module as described in any one of claims 1-7, characterized in that, The battery module includes a cell group (6), which includes multiple cells (61). Each cell (61) has a first direction (X), a second direction (Y), and a thickness direction (D) that are perpendicular to each other. The multiple cells (61) of the cell group (6) are arranged along the thickness direction (D). Each cell (61) has a tab (611) located at the end of the cell (61) along the first direction (X). The cell group (6) has end plates (1) on both sides along the thickness direction (D) and side plates (2) on both sides along the second direction (Y).

9. The battery module as described in claim 8, characterized in that, Each end plate (1) is provided with two stops (4), and the two stops (4) are symmetrically arranged relative to the middle section of the end plate (1) perpendicular to the second direction (Y).

10. The battery module as described in claim 8, characterized in that, The side plate (2) includes a main body (21) and two bent portions (22) connected to the main body (21); the main body (21) is disposed on the outside of the cell assembly (6) along the second direction (Y), and the two end plates (1) are detachably connected to the two bent portions (22) of the side plate (2) one by one through the disassembly structure (3); along the thickness direction (D), the bent portion (22) is connected to the side of the end plate (1) away from the cell assembly (6).

11. The battery module as described in claim 8, characterized in that, The end plate (1) has an assembly surface (11) that is away from the cell assembly (6) along the thickness direction (D), the stop (4) is provided on the assembly surface (11), and the assembly surface (11) is provided with an assembly boss (111); along the thickness direction (D), the disassembly structure (3) is detachably connected to the side of the assembly boss (111) away from the cell assembly (6).

12. The battery module as described in claim 11, characterized in that, Along the thickness direction (D), the distance from the side of the stop (4) away from the assembly surface (11) to the assembly surface (11) is not less than the distance from the side of the disassembly structure (3) away from the assembly surface (11) to the assembly surface (11).

13. The battery module as described in claim 11, characterized in that, The end plate (1) has components (5) on the assembly surface (11). Along the thickness direction (D), the distance from the side of the stop (4) away from the assembly surface (11) to the assembly surface (11) is not less than the distance from the side of the component (5) away from the assembly surface (11) to the assembly surface (11).

14. An electrical device comprising a battery module as described in any one of claims 1-13.

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