Battery module fixing device and battery pack

Abstract

The utility model provides a battery module fixing device and a battery pack. The battery module fixing device comprises a box shell, a base and a fixing mechanism, the box shell is hollow. A mounting cavity is defined by the box shell and the base jointly, and the battery module is fixedly mounted in the mounting cavity. The fixing mechanism comprises a fastening assembly and a plurality of L-shaped positioning seats. The fastening assembly comprises a plurality of bolt fasteners, an upper fixing plate and a lower fixing plate. One end of each bolt fastener is connected to the upper fixing plate, the other end of each bolt fastener is connected to the lower fixing plate, a profiling convex surface is formed at one end of each L-shaped positioning seat, the profiling convex surfaces abut against the outer wall of the lower support for positioning, and one end of each L-shaped positioning seat is in threaded connection with the inner side wall of the lower end of the box shell. The other end of the L-shaped positioning seat is in threaded connection with the lower fixing plate, so that the profiling convex surface synchronously abuts against the outer side wall of the lower support, the battery module is effectively positioned, it is ensured that the battery module does not shake, and the use safety performance of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a battery module fixing device and a battery pack. Background Art

[0002] The power battery pack mainly consists of several parts, including battery modules, battery management system (BMS), electrical system and box. During the production and use of the power battery pack, the battery module, battery management system (BMS) and electrical system need to be assembled inside the box and fixed.

[0003] For example, Chinese patent document CN215342840U discloses a power battery pack structure, including a box, a box cover and a module, wherein the box cover is arranged on the top of the box, the module is arranged in the box, the module includes a plurality of battery cells and brackets arranged at both ends of the battery cells, the height direction of the battery cells is parallel to the bottom of the box, a first limiting structure is arranged between the bracket and the bottom of the box, the first limiting structure is used to limit the displacement of the module relative to the side wall of the box in a direction perpendicular to the height of the battery cells, a second limiting structure is arranged between the bracket and the top of the box, the second limiting structure is used to limit the displacement of the module relative to the side wall of the box in the direction of the height of the battery cells, a buffer pad is arranged between the bracket and the box cover, and the buffer pad is used to limit the displacement of the module relative to the box up and down. The module limit in the battery pack is simple, bolt fixing is reduced, the cost of the battery pack is reduced, and the assembly efficiency is high.

[0004] However, the technical solution disclosed in the above patent still has the following problems: although the above battery pack reduces the use and fixation of bolts and improves the efficiency of assembly, the limit structure of the module is too simple, so the above battery pack structure is only suitable for the assembly and fixation of miniaturized modules, that is, the above battery pack cannot effectively fix the larger modules, which causes the risk of the modules shaking easily, reducing the safety performance of the power battery pack. For example, multiple groups of modules need to be assembled and fixed to the box at the same time, so that the volume and weight of the overall module will increase significantly. Therefore, during the actual movement of the power battery pack with the vehicle, the inertia of the module will also increase significantly. The simple limit structure strength inside the above battery pack is not enough to reliably fix the multiple groups of modules, which easily causes the modules to shake, and ultimately reduces the safety performance of the power battery pack. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a battery module fixing device and a battery pack that can effectively prevent the battery module from shaking.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A battery module fixing device includes a battery module, wherein the battery module includes a plurality of cylindrical battery cells, an upper bracket and a lower bracket, wherein the upper bracket and the lower bracket are spliced ​​to position each of the cylindrical battery cells, and the battery module fixing device further includes:

[0008] A box shell, wherein the box shell is hollow;

[0009] A base, wherein the box shell and the base together form an installation cavity, the lower end of the box shell is detachably connected to the base, and the battery module is fixedly installed in the installation cavity;

[0010] The fixing mechanism comprises a fastening assembly and a plurality of L-shaped positioning seats; the fastening assembly comprises a plurality of bolt fasteners, an upper fixing plate and a lower fixing plate; one end of each of the bolt fasteners is connected to the upper fixing plate, and the other end of each of the bolt fasteners is connected to the lower fixing plate, the upper fixing plate cover is arranged on the top of the upper bracket, the lower fixing plate cover is arranged on the bottom of the lower bracket, and the upper fixing plate is also screwed to the inner side wall of the upper end of the box shell; one end of each of the L-shaped positioning seats is formed with a contoured convex surface, the contoured convex surface is abutted and positioned with the outer wall of the lower bracket, and one end of each of the L-shaped positioning seats is screwed to the inner side wall of the lower end of the box shell, and the other end of each of the L-shaped positioning seats is screwed to the lower fixing plate.

[0011] In one embodiment, one end of each of the L-shaped positioning seats extends to the bottom surface of the lower fixing plate and forms a pressure-bearing plane, so that the pressure-bearing plane fits with the bottom surface of the lower fixing plate, and one end of each of the L-shaped positioning seats is provided with a first through hole;

[0012] The lower fixing plate is provided with a first rivet, and a threaded end of the first rivet is passed through the first through hole and is threadedly connected to a nut.

[0013] In one of the embodiments, the contoured convex surface is arranged perpendicular to the pressure-bearing plane.

[0014] In one embodiment, a second through hole is formed at the other end of each of the L-shaped positioning seats;

[0015] The battery module fixing device also includes a plurality of first screw members, and a threaded end of each of the first screw members is inserted into a corresponding second through hole and is threadedly connected to an inner side wall of the lower end of the box shell.

[0016] In one embodiment, each of the L-shaped positioning seats is an integrally formed structure.

[0017] In one embodiment, each of the L-shaped positioning seats is further provided with a gap for avoiding air, each of the gaps for avoiding air is located at a bend of the corresponding L-shaped positioning seat, and the gap for avoiding air is connected to the second through hole.

[0018] In one embodiment, two side walls of the upper bracket are respectively provided with first card slots, and two side walls of the lower bracket are respectively provided with second card slots, and the length direction of each first card slot coincides with the length direction of the corresponding second card slot.

[0019] In one embodiment, the battery module fixing device also includes a shock-absorbing and buffering component, which includes a plurality of PC sheets and a plurality of rubber elastic sheets, each of the PC sheets is bonded to the corresponding rubber elastic sheet, one end of each of the rubber elastic sheets is clamped in the corresponding first clamping slot, and the other end of each of the rubber elastic sheets is clamped in the corresponding second clamping slot, so that a side of each of the PC sheets facing away from the corresponding rubber elastic sheet is elastically abutted against the inner wall of the box shell.

[0020] In one embodiment, the base is provided with a plurality of reinforcement bone positions, the plurality of reinforcement bone positions are arranged in a grid shape, and some of the reinforcement bone positions are recessed in the top surface of the base to form a placement area;

[0021] The shock absorbing and buffering assembly also includes a fiber soft board and a rubber board. The rubber board is located directly above the fiber soft board. The fiber soft board and the rubber board are both arranged in the placement area, and the top surface of the rubber board abuts against the bottom surface of the lower fixing plate.

[0022] A battery pack, comprising an upper cover and any one of the above battery module fixing devices, wherein the upper cover is arranged on the upper end of the box shell and is detachably connected to the box shell;

[0023] The battery pack also includes a battery management system, which is located on the top surface of the upper fixing plate. The battery management system is used to be electrically connected to the battery module and control the normal operation of the battery pack.

[0024] Compared with the prior art, the utility model has at least the following advantages:

[0025] 1. By using nuts to tighten the bolt fasteners, the upper fixing plate and the lower fixing plate form a locking force to the upper bracket and the lower bracket to gather toward the middle; at the same time, the upper fixing plate is also screwed to the inner wall of the upper end of the box shell, which effectively improves the connection stability between the upper end of the battery module and the box shell, thereby ensuring that the battery module will not shake in the installation cavity, so as to improve the safety performance of the battery pack.

[0026] 2. The other ends of the multiple L-shaped positioning seats are respectively screwed to the lower fixing plate, and at the same time, one ends of the multiple L-shaped positioning seats are respectively screwed to the inner wall of the lower end of the box shell, so that the multiple contoured convex surfaces are synchronously abutted against the outer wall of the lower bracket, so that the lower end of the battery module can be effectively positioned to avoid the battery module from slipping or shaking relative to the lower fixing plate due to inertia, thereby effectively improving the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a schematic diagram of the structure of a battery module fixing device in one embodiment;

[0029] Figure 2 is a schematic structural diagram of a battery pack in another embodiment;

[0030] Figure 3 for Figure 1 A schematic diagram of the structure of the box shell and base of the battery module fixing device shown;

[0031] Figure 4 for Figure 1 An exploded schematic diagram of the structure of the battery module fixing device shown;

[0032] Figure 5 for Figure 1 An exploded schematic diagram of the structure of the battery module fixing device shown;

[0033] Figure 6 for Figure 1 A schematic diagram of a partial structure of a battery module fixing device shown;

[0034] Figure 7 for Figure 2 Schematic diagram of the structure of the three stacked sub-battery modules of the battery pack shown. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] The present disclosure provides a battery module fixing device, including a battery module, wherein the battery module includes a plurality of cylindrical cells, an upper bracket and a lower bracket, wherein the upper bracket is spliced ​​with the lower bracket to position each of the cylindrical cells. The battery module fixing device also includes a box shell, a base and a fixing mechanism. The box shell is hollow. The box shell and the base together form an installation cavity, the lower end of the box shell is detachably connected to the base, and the battery module is fixedly installed in the installation cavity. The fixing mechanism includes a fastening assembly and a plurality of L-shaped positioning seats; the fastening assembly includes a plurality of bolt fasteners, an upper fixing plate and a lower fixing plate; one end of each of the bolt fasteners is connected to the upper fixing plate, and the other end of each of the bolt fasteners is connected to the lower fixing plate, the upper fixing plate cover is arranged on the top of the upper bracket, the lower fixing plate cover is arranged on the bottom of the lower bracket, and the upper fixing plate is also screwed to the inner side wall of the upper end of the box shell; one end of each of the L-shaped positioning seats is formed with a contoured convex surface, the contoured convex surface is abutted and positioned with the outer wall of the lower bracket, and one end of each of the L-shaped positioning seats is respectively screwed to the inner side wall of the lower end of the box shell, and the other end of each of the L-shaped positioning seats is respectively screwed to the lower fixing plate.

[0039] See also Figures 1 to 7 In order to better understand the battery module fixing device 10 of the present application, the battery module fixing device 10 is further explained below:

[0040] The battery module fixing device 10 of one embodiment further includes a box shell 200, a base 300 and a fixing mechanism 400. The box shell 200 is hollow. The box shell 200 and the base 300 together form an installation cavity 201, the lower end of the box shell 200 is detachably connected to the base 300, and the battery module 100 is fixedly installed in the installation cavity 201.

[0041] In one embodiment, the fixing mechanism 400 includes a fastening assembly 410 and a plurality of L-shaped positioning seats 420; the fastening assembly 410 includes a plurality of bolt fasteners 4110, an upper fixing plate 4120 and a lower fixing plate 4130; one end of each of the bolt fasteners 4110 is connected to the upper fixing plate 4120, and the other end of each of the bolt fasteners 4110 is connected to the lower fixing plate 4130, the upper fixing plate 4120 is covered on the top of the upper bracket 120, and the lower fixing plate 4130 is connected to the upper fixing plate 4120. The plate 4130 is covered on the bottom of the lower bracket 130, and the upper fixing plate 4120 is also screwed to the inner wall of the upper end of the box shell 200; a contoured convex surface 4210 is formed at one end of each of the L-shaped positioning seats 420, and the contoured convex surface 4210 is abutted against the outer wall of the lower bracket 130 for positioning, and one end of each of the L-shaped positioning seats 420 is respectively screwed to the inner wall of the lower end of the box shell 200, and the other end of each of the L-shaped positioning seats 420 is respectively screwed to the lower fixing plate 4130.

[0042] In this embodiment, the bolt fastener 4110 is tightened by using a nut, so that the upper fixing plate 4120 and the lower fixing plate 4130 form a locking force that retracts the upper bracket 120 and the lower bracket 130 toward the middle; at the same time, the upper fixing plate 4120 is also screwed to the inner wall of the upper end of the box shell 200, which effectively improves the connection stability between the upper end of the battery module 100 and the box shell 200, thereby ensuring that the battery module 100 will not shake in the installation cavity 201, thereby improving the safety performance of the battery pack 20.

[0043] Furthermore, the other ends of the multiple L-shaped positioning seats 420 are respectively screwed to the lower fixing plate 4130, and at the same time, one ends of the multiple L-shaped positioning seats 420 are respectively screwed to the inner wall of the lower end of the box shell 200, so that the multiple contoured convex surfaces 4210 are synchronously abutted against the outer wall of the lower bracket 130, so that the lower end of the battery module 100 can be effectively positioned, avoiding the battery module 100 from slipping or shaking relative to the lower fixing plate 4130 due to inertia, thereby effectively improving the safety performance of the battery pack 20.

[0044] It should be noted that, in this embodiment, the entire battery module 100 in the mounting cavity 201 is composed of three stacked sub-battery modules (eg Figure 7 As shown in FIG. 2 , one end of the bolt fastener 4110 will be connected to the upper fixing plate 4120 of the topmost sub-battery module, and the other end of the bolt fastener 4110 will be connected to the lower fixing plate 4130 of the bottommost sub-battery module. It can be understood that in other embodiments, the entire battery module 100 in the installation cavity 201 can be multiple sub-battery modules, not limited to the same situation as the stacking of three sub-battery modules in the present embodiment.

[0045] like Figure 1 As shown, in one embodiment, one end of each L-shaped positioning seat 420 extends to the bottom surface of the lower fixing plate 4130 and forms a pressure-bearing plane 4220, so that the pressure-bearing plane 4220 is in contact with the bottom surface of the lower fixing plate 4130, and one end of each L-shaped positioning seat 420 is provided with a first through hole 4201. The lower fixing plate 4130 is provided with a first rivet 4132, and the threaded end of the first rivet 4132 is passed through the first through hole 4201 and is threadedly connected to the nut.

[0046] It is understandable that the pressure-bearing plane 4220 fits with the bottom surface of the lower fixing plate 4130, so that the threaded end of the first rivet 4132 is inserted into the first through hole 4201, and then the nut is tightened with the threaded end, so that the pressure-bearing plane 4220 and the bottom surface of the lower fixing plate 4130 fit better. In this embodiment, a plurality of first through holes 4201 are opened at one end of each L-shaped positioning seat 420, and a plurality of first rivets 4132 are used in conjunction with the corresponding first through holes 4201, so as to better limit the freedom of movement of one end of each L-shaped positioning seat 420, and ensure that one end of each L-shaped positioning seat 420 has a good connection stability with the lower fixing plate 4130.

[0047] like Figure 1 , Figure 4 and Figure 5 As shown in FIG. 1 , in one embodiment, the profiling convex surface 4210 is arranged perpendicular to the pressure-bearing plane 4220. It is understandable that, since the profiling convex surface 4210 is perpendicular to the pressure-bearing plane 4220, when one end of the L-shaped positioning seat 420 is connected to the bottom surface of the lower fixing plate 4130, the profiling convex surface 4210 moves to abut against the outer wall of the lower bracket 130, thereby limiting the lower bracket 130 from moving along the X-shaped bidirectional arrow (such as Figure 1 at the same time, through the combined use of multiple L-shaped positioning seats 420, that is, multiple contoured convex surfaces 4210 jointly form a reliable limit for the lower bracket 130, avoiding the problem of the lower bracket 130 being offset or shaking relative to the box shell 200.

[0048] like Figure 1 As shown, in one embodiment, a second through hole 4202 is formed at the other end of each L-shaped positioning seat 420. The battery module fixing device 10 further includes a plurality of first screw members 500, and a threaded end of each first screw member 500 is passed through a corresponding second through hole 4202 and is threadedly connected to the inner side wall of the lower end of the box shell 200.

[0049] In one embodiment, each of the L-shaped positioning seats 420 is an integrally formed structure. It is understandable that the integrally formed structure can make the L-shaped positioning seat 420 have a good structural connection strength. In this embodiment, the threaded end of the first screw member 500 is also sleeved with a spring washer (not shown), and then the threaded end of the first screw member 500 is threadedly connected to the inner side wall of the lower end of the box shell 200, so that the first screw member 500 has a good anti-loosening and shock-absorbing effect, and finally ensures that the lower end of the box shell 200 is reliably connected to the lower fixing plate 4130.

[0050] like Figure 1 As shown, in one embodiment, each of the L-shaped positioning seats 420 is further provided with an air-avoiding notch 4203, each of the air-avoiding notches 4203 is located at the bend of the corresponding L-shaped positioning seat 420, and the air-avoiding notches 4203 are connected to the second through hole 4202. It can be understood that the provision of the air-avoiding notches 4203 facilitates the installation of the first screw member 500 and ensures the structural rationality of the L-shaped positioning seat 420. It can be understood that in this embodiment, the L-shaped positioning seat 420 is an integrally formed injection molded part, and the provision of the air-avoiding notches 4203 effectively reduces the consumption of injection molding raw materials, thereby improving the manufacturability of the L-shaped positioning seat 420.

[0051] like Figures 3 to 6 As shown, in one embodiment, the two side walls of the upper bracket 120 are respectively provided with first card slots 1201, and the two side walls of the lower bracket 130 are respectively provided with second card slots 1301, and the length direction of each first card slot 1201 coincides with the length direction of the corresponding second card slot 1301. In one embodiment, the battery module fixing device 10 further includes a shock absorbing and buffering assembly 600, and the shock absorbing and buffering assembly 600 includes a plurality of PC sheets 610 and a plurality of rubber elastic sheets 620, each of the PC sheets 610 is bonded to the corresponding rubber elastic sheet 620, one end of each rubber elastic sheet 620 is clamped in the corresponding first card slot 1201, and the other end of each rubber elastic sheet 620 is clamped in the corresponding second card slot 1301, so that the side of each PC sheet 610 away from the corresponding rubber elastic sheet 620 elastically abuts against the inner side wall of the box shell 200.

[0052] It can be understood that after the PC sheet 610 and the rubber elastic sheet 620 are bonded together, one end of the rubber elastic sheet 620 is clamped in the corresponding first clamping slot 1201, and the other end of the rubber elastic sheet 620 is clamped in the corresponding second clamping slot 1301, so that the side of the PC sheet 610 that is away from the corresponding rubber elastic sheet 620 forms an elastic abutment with the inner wall of the box shell 200, which plays a stable and reliable buffering and shock-absorbing role for the upper bracket 120 and the lower bracket 130, and avoids the outer walls of the upper bracket 120 and the lower bracket 130 from shaking and hitting the inner walls around the box shell 200, thereby causing the safety performance of the battery module 100 to decrease.

[0053] It should be noted that the PC sheet 610 is a PC plastic part with a relatively smooth outer surface after molding. Therefore, after the PC sheet 610 is bonded to the corresponding rubber elastic sheet 620, the rubber elastic sheet 620 can be snapped into the first slot 1201 and the second slot 1301. The relatively smooth outer surface of the PC sheet 610 is in contact with the inner wall of the box shell 200, thereby ensuring the smoothness of the installation of the battery module 100 into the installation cavity 201 and improving the assembly efficiency of the battery module 100.

[0054] like Figures 4 to 7 As shown, in one embodiment, the base 300 is provided with a plurality of reinforcement bone positions 310, and the plurality of reinforcement bone positions 310 are arranged in a grid shape, and some of the reinforcement bone positions 310 are recessed in the top surface of the base 300 to form a placement area 301. The shock absorbing and buffering assembly 600 further includes a fiber soft board 630 and a rubber board 640, and the rubber board 640 is located directly above the fiber soft board 630. The fiber soft board 630 and the rubber board 640 are both arranged in the placement area 301, and the top surface of the rubber board 640 abuts against the bottom surface of the lower fixing plate 4130.

[0055] It can be understood that by strengthening the frame 310, it is ensured that the base 300 has sufficient structural strength, so that the base 300 can withstand the battery module 100 with a larger volume and weight; at the same time, a rubber plate 640 is provided on the bottom surface of the lower fixed plate 4130, so that the top surface of the rubber plate 640 and the bottom surface of the lower fixed plate 4130 form a large friction resistance, which can prevent the lower fixed plate 4130 from slipping relative to the rubber plate 640 due to inertia, and provide elastic buffering for the battery module 100, thereby effectively preventing the battery module 100 from shaking, and improving the safety performance of the battery pack 20.

[0056] The present application also provides a battery pack 20, comprising an upper cover 700 and a battery module fixing device 10 as described in any of the above embodiments, wherein the upper cover 700 is disposed on the upper end of the box shell 200 and is detachably connected to the box shell 200. The battery pack 20 also includes a battery management system (not shown), which is located on the top surface of the upper fixing plate 4120, and is used to be electrically connected to the battery module 100 and control the normal operation of the battery pack 20.

[0057] In this embodiment, nuts are used to tighten the bolt fasteners so that the upper fixing plate and the lower fixing plate form a locking force that retracts the upper bracket and the lower bracket toward the middle; at the same time, the upper fixing plate is also screwed to the inner wall of the upper end of the box shell, which effectively improves the connection stability between the upper end of the battery module and the box shell, thereby ensuring that the battery module will not shake in the installation cavity, thereby improving the safety performance of the battery pack.

[0058] Furthermore, the other ends of the multiple L-shaped positioning seats are respectively screwed to the lower fixing plate, and at the same time, one ends of the multiple L-shaped positioning seats are respectively screwed to the inner wall of the lower end of the box shell, so that the multiple contoured convex surfaces are synchronously abutted against the outer wall of the lower bracket, so that the lower end of the battery module can be effectively positioned, avoiding the battery module from slipping or shaking relative to the lower fixing plate due to inertia, thereby effectively improving the safety performance of the battery pack.

[0059] Compared with the prior art, the utility model has at least the following advantages:

[0060] 1. By using nuts to tighten the bolt fasteners, the upper fixing plate and the lower fixing plate form a locking force to the upper bracket and the lower bracket to gather toward the middle; at the same time, the upper fixing plate is also screwed to the inner wall of the upper end of the box shell, which effectively improves the connection stability between the upper end of the battery module and the box shell, thereby ensuring that the battery module will not shake in the installation cavity, so as to improve the safety performance of the battery pack.

[0061] 2. The other ends of the multiple L-shaped positioning seats are respectively screwed to the lower fixing plate, and at the same time, one ends of the multiple L-shaped positioning seats are respectively screwed to the inner wall of the lower end of the box shell, so that the multiple contoured convex surfaces are synchronously abutted against the outer wall of the lower bracket, so that the lower end of the battery module can be effectively positioned to avoid the battery module from slipping or shaking relative to the lower fixing plate due to inertia, thereby effectively improving the safety performance of the battery pack.

[0062] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A battery module fixing device, comprising a battery module, wherein the battery module comprises a plurality of cylindrical cells, an upper bracket and a lower bracket, wherein the upper bracket and the lower bracket are spliced ​​to position each of the cylindrical cells, wherein: The battery module fixing device also includes: A box shell, wherein the box shell is hollow; A base, wherein the box shell and the base together form an installation cavity, the lower end of the box shell is detachably connected to the base, and the battery module is fixedly installed in the installation cavity; The fixing mechanism comprises a fastening assembly and a plurality of L-shaped positioning seats; the fastening assembly comprises a plurality of bolt fasteners, an upper fixing plate and a lower fixing plate; one end of each of the bolt fasteners is connected to the upper fixing plate, and the other end of each of the bolt fasteners is connected to the lower fixing plate, the upper fixing plate cover is arranged on the top of the upper bracket, the lower fixing plate cover is arranged on the bottom of the lower bracket, and the upper fixing plate is also screwed to the inner side wall of the upper end of the box shell; one end of each of the L-shaped positioning seats is formed with a contoured convex surface, the contoured convex surface is abutted and positioned with the outer wall of the lower bracket, and one end of each of the L-shaped positioning seats is screwed to the inner side wall of the lower end of the box shell, and the other end of each of the L-shaped positioning seats is screwed to the lower fixing plate.

2. The battery module fixing device according to claim 1, characterized in that: One end of each of the L-shaped positioning seats extends to the bottom surface of the lower fixing plate and forms a pressure-bearing plane, so that the pressure-bearing plane is in contact with the bottom surface of the lower fixing plate, and one end of each of the L-shaped positioning seats is provided with a first through hole; The lower fixing plate is provided with a first rivet, and a threaded end of the first rivet is passed through the first through hole and is threadedly connected to a nut.

3. The battery module fixing device according to claim 2, characterized in that: The contoured convex surface is arranged perpendicularly to the pressure-bearing plane.

4. The battery module fixing device according to claim 1, characterized in that: A second through hole is formed at the other end of each L-shaped positioning seat; The battery module fixing device also includes a plurality of first screw members, and a threaded end of each of the first screw members is inserted into a corresponding second through hole and is threadedly connected to an inner side wall of the lower end of the box shell.

5. The battery module fixing device according to claim 1, characterized in that: Each of the L-shaped positioning seats is an integrally formed structure.

6. The battery module fixing device according to claim 4, characterized in that: Each of the L-shaped positioning seats is also provided with a gap for avoiding air, each of the gaps for avoiding air is located at a bending position of the corresponding L-shaped positioning seat, and the gap for avoiding air is connected to the second through hole.

7. The battery module fixing device according to claim 1, characterized in that: The two side walls of the upper bracket are respectively provided with first card slots, and the two side walls of the lower bracket are respectively provided with second card slots, and the length direction of each first card slot coincides with the length direction of the corresponding second card slot.

8. The battery module fixing device according to claim 7, characterized in that: The battery module fixing device also includes a shock-absorbing and buffering component, which includes a plurality of PC sheets and a plurality of rubber elastic sheets. Each of the PC sheets is bonded to the corresponding rubber elastic sheet, one end of each of the rubber elastic sheets is clamped in the corresponding first clamping slot, and the other end of each of the rubber elastic sheets is clamped in the corresponding second clamping slot, so that a side of each of the PC sheets facing away from the corresponding rubber elastic sheet is elastically abutted against the inner side wall of the box shell.

9. The battery module fixing device according to claim 8, characterized in that: The base is provided with a plurality of reinforcement bone positions, the plurality of reinforcement bone positions are arranged in a grid shape, and some of the reinforcement bone positions are recessed in the top surface of the base to form a placement area; The shock absorbing and buffering assembly also includes a fiber soft board and a rubber board. The rubber board is located directly above the fiber soft board. The fiber soft board and the rubber board are both arranged in the placement area, and the top surface of the rubber board abuts against the bottom surface of the lower fixing plate.

10. A battery pack, characterized in that: It comprises an upper cover and a battery module fixing device as claimed in any one of claims 1 to 9, wherein the upper cover is arranged on the upper end of the box shell and is detachably connected to the box shell; The battery pack also includes a battery management system, which is located on the top surface of the upper fixing plate. The battery management system is used to be electrically connected to the battery module and control the normal operation of the battery pack.

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