Fixing device of battery module

Abstract

The utility model relates to the technical field of batteries, and discloses a fixing device of a battery module, the fixing device is used for fixing the battery module, the battery module comprises a plurality of battery cell groups which are arranged side by side, each battery cell group has deformation quantity along the battery cell arrangement direction, and the fixing device comprises a bottom plate, a plurality of fixing plates and a plurality of fixing plates, the side plate assembly comprises a first side plate, a second side plate, a third side plate and a fourth side plate which are arranged along the periphery of the bottom plate, and the first side plate, the second side plate, the third side plate and the fourth side plate are sequentially connected end to end and are encircled to form an accommodating groove for accommodating a plurality of battery cell groups; the two ends of the fourth side plate are detachably connected with the ends, deviating from the second side plate, of the first side plate and the third side plate respectively, and the linear distance between the fourth side plate and the second side plate is smaller than or equal to the length of the battery cell group before deformation. The utility model has the advantages that the synchronous fixing of a plurality of battery cell groups can be realized, the structure is simple, the assembly is easy, and the production cost is low.

Description

Technical Field

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

[0002] In automotive or mobile device applications, battery modules must withstand complex external forces such as vibration, bumps, and impacts. To prevent cells from loosening or being damaged due to mechanical stress, existing technologies typically place end plates at both ends of the cell assembly and secure them to the cell assembly with steel straps. However, for large-capacity battery packs, which integrate multiple cell assemblies, using separate end plates and steel straps for each cell assembly would not only significantly increase battery pack production costs but also drastically reduce overall assembly efficiency. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to propose a battery module fixing device that can realize the synchronous fixing of multiple battery cell groups, and has a simple structure, is easy to assemble, and has low production cost.

[0004] The technical solution adopted by this utility model to solve its technical problem is to provide a fixing device for a battery module, which is used to fix the battery module, the battery module including multiple battery cell groups arranged side by side, and each battery cell group having a deformation along the battery cell arrangement direction, the fixing device including:

[0005] Base plate;

[0006] A side plate assembly includes a first side plate, a second side plate, a third side plate, and a fourth side plate arranged around the perimeter of the base plate. The first side plate, the second side plate, the third side plate, and the fourth side plate are connected end to end in sequence and enclose a receiving groove for accommodating multiple battery cell groups. The two ends of the fourth side plate are detachably connected to the ends of the first side plate and the third side plate that are away from the second side plate. The straight-line distance between the fourth side plate and the second side plate is less than or equal to the length of the battery cell group before deformation.

[0007] Furthermore, the bottom plate is provided with a locking assembly at one end near the fourth side plate. The locking assembly is located on the side of the fourth side plate away from the receiving groove and has a locking member that abuts against the middle part of the fourth side plate.

[0008] Furthermore, the locking assembly includes a mounting base disposed on the base plate and having a gap between it and the fourth side plate. The locking member is movably disposed on the mounting base and has a first moving position and a second moving position. When the locking member is in the first moving position, its end abuts against the fourth side plate; when the locking member is in the second moving position, its end is separated from the fourth side plate.

[0009] Furthermore, the mounting base includes a connecting part and a mounting part. The connecting part is horizontally fixed on the base plate, and the mounting part is vertically disposed on the connecting part and parallel to the fourth side plate. The locking member is rotatably disposed on the mounting part and perpendicular to the mounting part.

[0010] Furthermore, the mounting base includes two reinforcing ribs disposed on the connecting portion, and the two reinforcing ribs are respectively perpendicularly connected to both sides of the mounting portion.

[0011] Furthermore, the locking element is a bolt, which includes an integrally formed head and a threaded portion, the threaded portion being threadedly connected to the mounting portion, and a washer being provided between the head and the mounting portion.

[0012] Furthermore, the first side plate, the second side plate, and the third side plate are vertically fixedly connected in sequence, and the first side plate and the third side plate are each provided with a bent edge parallel to the fourth side plate at the end near the fourth side plate.

[0013] Furthermore, the first side plate is provided with a plurality of first reinforcing rods, the second side plate is provided with a plurality of second reinforcing rods, the third side plate is provided with a plurality of third reinforcing rods, and the fourth side plate is provided with a plurality of fourth reinforcing rods, wherein the first reinforcing rod, the second reinforcing rod, the third reinforcing rod and the fourth reinforcing rod are hollow structures.

[0014] Furthermore, a plurality of the fourth reinforcing rods are disposed on the side of the fourth side plate opposite to the receiving groove, wherein at least two of the fourth reinforcing rods correspond one-to-one with the two bent edges and are detachably connected by fasteners, and at least one of the fourth reinforcing rods is opposite to the locking member and has a positioning surface that can abut against the locking member.

[0015] Furthermore, a plurality of second reinforcing rods are disposed on the side of the second side plate facing the receiving groove, and the side of the second reinforcing rods facing the receiving groove is provided with an isolation structure, the projection of the isolation structure along the horizontal direction perpendicular to the second side plate can cover the area where the plurality of second reinforcing rods are located.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] 1. In this utility model, the fixing device includes a base plate and a first side plate, a second side plate, a third side plate, and a fourth side plate arranged around the base plate. The four side plates are connected end to end in sequence and form a receiving groove for accommodating multiple battery cell groups. The fourth side plate is detachably connected to the first and third side plates, and the straight-line distance between the fourth side plate and the second side plate is less than or equal to the length of the battery cell group before deformation. This design can fix multiple battery cell groups simultaneously, eliminating the need for independent end plates and steel strips for each battery cell group, effectively saving production costs and significantly improving assembly efficiency. In addition, through the spacing design between the fourth side plate and the second side plate and the cooperation of their detachable structure, not only is efficient installation of the battery cell group achieved, but a pre-tightening force can also be formed on the battery cell group after assembly, thereby effectively suppressing the expansion deformation of the battery cells.

[0018] 2. In this utility model, a locking assembly is also provided on the side of the base plate near the fourth side plate. This locking assembly is located on the side of the fourth side plate away from the receiving groove and has a locking member that abuts against the middle part of the fourth side plate. This design enhances the rigidity of the middle area of ​​the fourth side plate, ensures uniform transmission of preload, reduces the risk of bending of the middle part of the fourth side plate due to cell expansion, and improves the overall structural stability.

[0019] 3. In this utility model, the locking assembly includes a mounting base disposed on the base plate and having a gap between it and the fourth side plate. The locking member is movably disposed on the mounting base and has a first moving position and a second moving position. When the locking member is in the first moving position, its end abuts against the fourth side plate; when the locking member is in the second moving position, its end separates from the fourth side plate. This design allows the locking member to be moved to the corresponding position to lock and unlock the fourth side plate, significantly simplifying the assembly and disassembly process and improving operational efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the fixing device in this utility model.

[0021] Figure 2 This is an exploded view of the fixing device in this utility model.

[0022] Figure 3 for Figure 2 A structural diagram from another perspective.

[0023] Figure 4 This is an exploded view of a partial structure of the fixing device in this utility model.

[0024] Figure 5 This is a schematic diagram of the battery module being assembled in a mounting device.

[0025] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0026] 100. Base plate; 200. First side plate; 210. Bending edge; 220. First reinforcing rod; 300. Second side plate; 310. Second reinforcing rod; 320. Isolation structure; 400. Third side plate; 410. Third reinforcing rod; 500. Fourth side plate; 510. Fourth reinforcing rod; 511. Positioning surface; 600. Receiving groove; 700. Locking assembly; 710. Locking element; 711. Head; 712. Screw part; 713. Washer; 720. Mounting base; 721. Connecting part; 722. Mounting part; 723. Reinforcing rib; 800. Fastener; 900. Battery module; 910. Cell assembly. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0032] like Figures 1 to 5 As shown, in this embodiment, a battery module fixing device is used to fix a battery module 900, which includes a plurality of battery cell groups 910 arranged side by side, and each battery cell group 910 has a deformation along the battery cell arrangement direction. The fixing device includes:

[0033] Base plate 100;

[0034] The side panel assembly includes a first side panel 200, a second side panel 300, a third side panel 400, and a fourth side panel 500 arranged around the base plate 100. The first side panel 200, the second side panel 300, the third side panel 400, and the fourth side panel 500 are connected end to end in sequence and enclose a receiving groove 600 for accommodating multiple battery cell groups 910. The two ends of the fourth side panel 500 are detachably connected to the ends of the first side panel 200 and the third side panel 400 that are away from the second side panel 300, respectively. The straight-line distance between the fourth side panel 500 and the second side panel 300 is less than or equal to the length of the battery cell group 910 before deformation. This design can simultaneously fix multiple battery cell groups 910, eliminating the need for separate end plates and steel strips for each battery cell group 910, effectively saving production costs and significantly improving assembly efficiency. In addition, through the spacing design between the fourth side plate 500 and the second side plate 300 and the cooperation of their detachable structure, not only is efficient installation of the battery cell group 910 achieved, but a pre-tightening force can also be formed on the battery cell group 910 after assembly, thereby effectively suppressing the expansion deformation of the battery cells.

[0035] Specifically, in this embodiment, the battery module 900's cell assembly 910 is generally formed by stacking multiple cells. To prevent short circuits between cells due to expansion or vibration, an insulating sheet with elastic deformation capability is typically provided between adjacent cells. This insulating sheet undergoes elastic deformation when the cell assembly 910 is compressed by preload, absorbing the mechanical stress between the cells. Therefore, the length of the cell assembly 910 in its free state (before deformation) is greater than its length after being preloaded and compressed in the fixing device (after deformation), meaning that the cell assembly 910 has deformation along the cell arrangement direction.

[0036] like Figures 1 to 5 As shown, in this embodiment, the fixing device mainly consists of a base plate 100, a side plate assembly, and a locking assembly 700. The base plate 100 and the side plate assembly are the core components for fixing the battery module 900, while the locking assembly 700 serves as an auxiliary constraint component, ensuring the stability of the fixing of the multiple cell groups 910 of the battery module 900.

[0037] In this embodiment, the base plate 100 is rectangular, providing a stable foundation support platform. The side plate assembly includes a first side plate 200, a second side plate 300, a third side plate 400, and a fourth side plate 500. The four side plates are connected end to end and arranged around the base plate 100, forming a rectangular receiving slot 600 for accommodating multiple battery cell groups 910. This design achieves synchronous fixing and overall constraint of multiple battery cell groups 910, eliminating the need for separate end plates for each battery cell group 910 as required by traditional battery modules 900. This not only simplifies the overall structure but also significantly reduces material usage and processing steps, effectively lowering production costs.

[0038] Preferably, in this embodiment, the first side plate 200, the second side plate 300, the third side plate 400, and the fourth side plate 500 are perpendicularly connected to the base plate 100 to form a stable three-dimensional frame structure. The first side plate 200 and the third side plate 400 are long side plates, extending along the long side of the base plate 100; the second side plate 300 and the fourth side plate 500 are short side plates, arranged along the short side of the base plate 100.

[0039] In this embodiment, the two ends of the fourth side plate 500 are detachably connected to the ends of the first side plate 200 and the third side plate 400 that are away from the second side plate 300, respectively, and the straight-line distance between the fourth side plate 500 and the second side plate 300 is less than or equal to the length of the cell assembly 910 before deformation. This design allows the entire side plate assembly to be assembled with the base plate 100 and the other three side plates before the cell assembly 910 is installed, forming a receiving groove 600 with openings on both sides. Thus, when installing the cell assembly 910, it is only necessary to place the cell assembly 910 into the receiving groove 600, and then install and fix the fourth side plate 500, which greatly simplifies the assembly process and improves work efficiency. The spacing design between the fourth side plate 500 and the second side plate 300 ensures that the cell assembly 910 will be subjected to a certain preload after assembly. This preload force can provide reverse constraint when the cell assembly 910 expands due to temperature changes or other reasons, effectively suppressing its expansion deformation and preventing excessive stress concentration inside the cell assembly 910, thereby extending the service life of the battery module 900.

[0040] In this embodiment, the first side plate 200, the second side plate 300, and the third side plate 400 are vertically fixedly connected in sequence. Specifically, the three are stably connected by welding, riveting, or bolting to form a stable U-shaped structural foundation. This design not only enhances the structural rigidity of the entire fixing device but also provides an accurate positioning reference for the subsequent installation of the fourth side plate 500.

[0041] Preferably, the first side plate 200, the second side plate 300, and the third side plate 400 are integrally formed with the base plate 100, specifically formed by bending three sides of the base plate 100 upwards by 90°, and the three are connected by welding. This design not only simplifies the manufacturing process but also further improves the overall strength and rigidity of the fixing device.

[0042] In this embodiment, both the first side plate 200 and the third side plate 400 have a bent edge 210 parallel to the fourth side plate 500 at one end near the fourth side plate 500. Preferably, the bent edge 210 is formed by bending the ends of the first side plate 200 and the third side plate 400 from the inside out at a 90° angle. This design provides good positioning support and connection foundation for the installation of the fourth side plate 500, not only enhancing the load-bearing capacity of the first side plate 200 and the third side plate 400 on the fourth side plate 500, but also improving the overall rigidity and deformation resistance of the connection part 721.

[0043] In this embodiment, the fourth side plate 500 is provided separately, and its two ends are detachably connected to the bent edges 210 of the first side plate 200 and the third side plate 400 by fasteners 800. This design not only facilitates the quick installation and removal of the fourth side plate 500, but also makes the entire battery module 900 more flexible during the assembly process.

[0044] In this embodiment, the first side plate 200 is provided with multiple first reinforcing rods 220, the second side plate 300 is provided with multiple second reinforcing rods 310, the third side plate 400 is provided with multiple third reinforcing rods 410, and the fourth side plate 500 is provided with multiple fourth reinforcing rods 510. The first reinforcing rods 220, second reinforcing rods 310, third reinforcing rods 410, and fourth reinforcing rods 510 are hollow structures. This design effectively improves the structural strength and deformation resistance of the entire fixing device. Simultaneously, the hollow structure reduces the overall weight while maintaining strength, which is beneficial for achieving a lightweight design of the battery module 900.

[0045] Preferably, in this embodiment, two first reinforcing rods 220 and two third reinforcing rods 410 are provided. The first reinforcing rod 220 is fixed to the side of the first side plate 200 opposite to the receiving groove 600 by welding or screws, and is spaced apart along the height direction of the first side plate 200. The third reinforcing rod 410 is fixed to the side of the third side plate 400 opposite to the receiving groove 600 by welding or screws, and is spaced apart along the height direction of the third side plate 400. This design avoids interference with the internal space of the receiving groove 600, thereby maximizing the installation space of the cell assembly 910. At the same time, the spaced arrangement can effectively enhance the bending stiffness of the side plate and improve its load-bearing capacity against external loads. Especially when the battery module 900 is subjected to complex working conditions such as vibration and impact, it helps to maintain the stability and safety of the overall structure.

[0046] In this embodiment, multiple second reinforcing rods 310 are fixed to the side of the second side plate 300 facing the receiving groove 600 by welding or screws. Preferably, there are six second reinforcing rods 310. Two of them are arranged horizontally and are spaced apart along the height direction of the second side plate 300; the remaining four are arranged vertically and are spaced apart along the width direction of the second side plate 300, and the vertical reinforcing rods are connected to the horizontal reinforcing rods to form an approximately grid-like support structure. This not only effectively improves the overall rigidity and deformation resistance of the side plate, but also provides stronger restraint when the battery cell assembly 910 expands, preventing structural instability or deformation caused by uneven local stress.

[0047] In this embodiment, the second reinforcing rod 310 has an isolation structure 320 on the side facing the receiving groove 600. For example... Figure 4 As indicated by the arrow, the projection of the isolation structure 320 along the horizontal direction perpendicular to the second side plate 300 can cover the area where multiple second reinforcing rods 310 are located. This design achieves electrical isolation between the battery pack 910 and the second reinforcing rods 310, effectively avoiding the risk of short circuits.

[0048] In this embodiment, the isolation structure 320 is a planar or plate-like structure with folded edges. Preferably, the isolation structure 320 is a plate-like structure with folded edges. This design significantly improves the overall rigidity and deformation resistance of the isolation structure 320, enabling it to maintain good structural stability when subjected to cell expansion forces or external vibrations.

[0049] In this embodiment, multiple fourth reinforcing rods 510 are fixed to the side of the fourth side plate 500 opposite to the receiving groove 600 by welding or screws. At least two fourth reinforcing rods 510 correspond one-to-one with the two bent edges 210 and are detachably connected by fasteners 800. At least one fourth reinforcing rod 510 is opposite to the locking member 710 and has a positioning surface 511 that abuts against the locking member 710. This design not only enhances the overall rigidity and load-bearing capacity of the fourth side plate 500 but also provides additional support and stability for the connection between the fourth side plate 500 and the first side plate 200 and the third side plate 400.

[0050] Preferably, in this embodiment, the fourth reinforcing rod 510 comprises seven rods. Two of them are horizontally arranged and spaced apart along the height direction of the fourth side plate 500; the remaining five are vertically arranged and spaced apart along the width direction of the fourth side plate 500, and the vertical reinforcing rods are connected to the horizontal reinforcing rods to form an approximately grid-like support structure. This design significantly improves the structural strength and deformation resistance of the fourth side plate 500 without significantly increasing the weight.

[0051] In this embodiment, a locking assembly 700 is also provided at one end of the base plate 100 near the fourth side plate 500. The locking assembly 700 is located on the side of the fourth side plate 500 opposite to the receiving groove 600 and has a locking member 710 that abuts against the middle part of the fourth side plate 500. This design, by arranging the locking assembly 700 on the outside of the fourth side plate 500, effectively constrains the fourth side plate 500, further enhancing its resistance to deformation when the battery cell assembly 910 expands. The locking member 710 acts on the middle region of the fourth side plate 500, which helps to evenly transmit external preload to the entire side plate structure, thereby reducing the risk of bending in the middle of the fourth side plate 500 due to battery cell expansion and improving the overall structural stability.

[0052] In this embodiment, the locking assembly 700 includes a mounting base 720 disposed on the base plate 100 and having a gap between it and the fourth side plate 500. A locking member 710 is movably mounted on the mounting base 720 and has a first moving position and a second moving position. When the locking member 710 is in the first moving position, its end abuts against the positioning surface 511 of the fourth reinforcing rod 510 on the fourth side plate 500, thereby applying a preload force to the fourth side plate 500. When the locking member 710 is in the second moving position, its end separates from the positioning surface 511 of the fourth reinforcing rod 510 on the fourth side plate 500, releasing the constraint on the fourth side plate 500. This design allows the locking member 710 to lock and unlock the fourth side plate 500 simply by moving to the corresponding position, significantly simplifying the assembly and disassembly process and improving operational efficiency.

[0053] In this embodiment, the mounting base 720 includes a connecting portion 721 and a mounting portion 722. The connecting portion 721 is plate-shaped and horizontally welded and fixed to the base plate 100, ensuring that the mounting base 720 as a whole has good structural stability and load-bearing capacity. The mounting portion 722 is vertically disposed on the connecting portion 721 and parallel to the fourth side plate 500 to ensure the positioning accuracy of the locking member 710. The locking member 710 is rotatably mounted on the mounting portion 722 and perpendicular to the mounting portion 722. This design allows the locking member 710 to rotate around an axis during operation, effectively locking or releasing the fourth side plate 500 when switching to different positions.

[0054] In this embodiment, the mounting base 720 includes two reinforcing ribs 723 vertically disposed on the connecting portion 721, and the two reinforcing ribs 723 are respectively vertically connected to both sides of the mounting portion 722. This design not only significantly improves the support strength of the mounting portion 722, but also effectively disperses the preload applied by the locking member 710, preventing structural damage caused by local stress concentration.

[0055] Preferably, in this embodiment, the reinforcing rib 723 is triangular in shape, integrally formed with the mounting portion 722, and formed by bending the two sides of the mounting portion 722 at 90°. This design not only enhances the overall structural strength and deformation resistance of the mounting base 720, but also simplifies the processing flow, which is beneficial to improving production efficiency and manufacturing consistency.

[0056] In this embodiment, the locking member 710 is a bolt, which includes an integrally formed head 711 and a threaded portion 712. The threaded portion 712 is threadedly connected to the mounting portion 722, and a washer 713 is provided between the head 711 and the mounting portion 722. This design simplifies the manufacturing process, improves production efficiency, and reduces the complexity of assembly steps. Furthermore, the application of the washer 713 further enhances the safety and durability of the overall structure.

Claims

1. A fixing device for a battery module, used to fix a battery module (900), the battery module (900) comprising a plurality of side-by-side arranged cell groups (910), and each of the cell groups (910) having a deformation along the cell arrangement direction, characterized in that, The fixing device includes: Base plate (100); A side panel assembly, comprising a first side panel (200), a second side panel (300), a third side panel (400), and a fourth side panel (500) arranged around the base plate (100). The first side panel (200), the second side panel (300), the third side panel (400), and the fourth side panel (500) are connected end to end in sequence and enclose a receiving groove (600) for accommodating multiple battery cell groups (910). The two ends of the fourth side panel (500) are detachably connected to the ends of the first side panel (200) and the third side panel (400) that are away from the second side panel (300), respectively. The straight-line distance between the fourth side panel (500) and the second side panel (300) is less than or equal to the length of the battery cell group (910) before deformation.

2. The battery module fixing device according to claim 1, characterized in that, The base plate (100) is also provided with a locking assembly (700) at one end near the fourth side plate (500). The locking assembly (700) is located on the side of the fourth side plate (500) away from the receiving groove (600) and has a locking member (710) that abuts against the middle part of the fourth side plate (500).

3. The battery module fixing device according to claim 2, characterized in that, The locking assembly (700) includes a mounting base (720) disposed on the base plate (100) and having a gap between it and the fourth side plate (500). The locking member (710) is movably disposed on the mounting base (720) and has a first moving position and a second moving position. When the locking member (710) is in the first moving position, its end abuts against the fourth side plate (500); when the locking member (710) is in the second moving position, its end is separated from the fourth side plate (500).

4. The battery module fixing device according to claim 3, characterized in that, The mounting base (720) includes a connecting part (721) and a mounting part (722). The connecting part (721) is horizontally fixed on the base plate (100). The mounting part (722) is vertically disposed on the connecting part (721) and parallel to the fourth side plate (500). The locking member (710) is rotatably disposed on the mounting part (722) and perpendicular to the mounting part (722).

5. The battery module fixing device according to claim 4, characterized in that, The mounting base (720) includes two reinforcing ribs (723) disposed on the connecting portion (721), and the two reinforcing ribs (723) are respectively perpendicularly connected to both sides of the mounting portion (722).

6. The battery module fixing device according to claim 4, characterized in that, The locking member (710) is a bolt, which includes an integrally formed head (711) and a threaded portion (712), the threaded portion (712) being threadedly connected to the mounting portion (722), and a washer (713) being provided between the head (711) and the mounting portion (722).

7. The battery module fixing device according to claim 2, characterized in that, The first side plate (200), the second side plate (300) and the third side plate (400) are vertically fixedly connected in sequence, and the first side plate (200) and the third side plate (400) are both provided with a bent edge (210) parallel to the fourth side plate (500) at the end near the fourth side plate (500).

8. The battery module fixing device according to claim 7, characterized in that, The first side plate (200) is provided with a plurality of first reinforcing rods (220), the second side plate (300) is provided with a plurality of second reinforcing rods (310), the third side plate (400) is provided with a plurality of third reinforcing rods (410), and the fourth side plate (500) is provided with a plurality of fourth reinforcing rods (510), and the first reinforcing rods (220), second reinforcing rods (310), third reinforcing rods (410) and fourth reinforcing rods (510) are hollow structures.

9. A battery module fixing device according to claim 8, characterized in that, Multiple fourth reinforcing rods (510) are provided on the side of the fourth side plate (500) away from the receiving groove (600), wherein at least two of the fourth reinforcing rods (510) correspond one-to-one with the two bent edges (210) and are detachably connected by fasteners (800), and at least one of the fourth reinforcing rods (510) is opposite to the locking member (710) and has a positioning surface (511) that can abut against the locking member (710).

10. A battery module fixing device according to claim 8, characterized in that, Multiple second reinforcing rods (310) are provided on the side of the second side plate (300) facing the receiving groove (600), and the side of the second reinforcing rods (310) facing the receiving groove (600) is provided with an isolation structure (320). The projection of the isolation structure (320) along the horizontal direction perpendicular to the second side plate (300) can cover the area where multiple second reinforcing rods (310) are located.

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