CN212195159U - Battery module tight fixing device and electric motor car expand - Google Patents

Abstract

The utility model relates to the field of automotive technology, a tight fixing device and electric motor car of battery module expand is disclosed, include the battery module and expand tight mechanism. The battery module is provided with a plurality of insertion holes, and the axis of each insertion hole extends along the vertical direction; the tight mechanism of expanding is provided with a plurality of tight monomers that expand that are linked together with the shunt tubes including setting up the shunt tubes on the frame on the shunt tubes, and each tight monomer that expands can the one-to-one insert each cartridge hole in, and the tight monomer that expands is configured to can expand tightly to be fixed in the cartridge hole to make battery module locking assemble on the frame. The utility model discloses a tight fixing device expands through the tight monomer that expands and is fixed in the mode in the cartridge hole with the battery module and fix on the frame, when the tight free tight power that expands disappears, the battery module can drop from the frame fast, so its fast loading and unloading that can realize the battery module fast practices thrift the change time, improves user experience.

Description

Battery module tight fixing device and electric motor car expand

Technical Field

The utility model relates to the field of automotive technology, especially, relate to a tight fixing device of battery module inflation and electric motor car.

Background

With the deep development of the new energy automobile market, electric automobiles with high endurance mileage, low cost and high-rate quick charging are more and more favored by the market.

When the energy storage of the battery pack or the battery module is insufficient, the battery pack or the battery module needs to be replaced in time or temporarily charged. In order to save time effectively, the current research and development direction mainly includes the directions of high energy storage, fast charging, fast replacement and the like of a battery pack or a battery module. However, in the conventional electric vehicle capable of realizing the quick charging performance, the time required for charging the state of charge from 0% to 80% is between 30 minutes and 40 minutes, and the problem of long charging time is caused. For long-distance driving users and users with time shortage, more time is undoubtedly delayed, and the user experience is reduced. And the quick replacement of battery package or battery module then can save time greatly, improves user experience, and then promotes the market competition of electric motor car. However, the current assembly device for the battery pack or the battery module on the automobile frame is complex in design and high in cost, and meanwhile, the assembly and disassembly steps of the battery pack or the battery module are still time-consuming and tedious.

Therefore, it is urgently needed to provide a battery module tight fixing device and electric motor car that expands, and it can realize the fast loading and unloading of battery module fast, practices thrift the change time, improves user experience.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a tight fixing device expands of battery module, its fast loading and unloading that can realize the battery module fast practices thrift the change time, improves user experience.

To achieve the purpose, the utility model adopts the following technical proposal:

a battery module tight fixing device that expands includes:

the battery module is provided with a plurality of insertion holes, and the axis of each insertion hole extends along the vertical direction;

the expansion mechanism comprises a shunt pipe arranged on the frame, a plurality of expansion units communicated with the shunt pipe are arranged on the shunt pipe, each expansion unit can be inserted into each insertion hole in a one-to-one correspondence mode, and the expansion units are configured to be capable of being expanded and fixed in the insertion holes, so that the battery module is locked and assembled on the frame.

Optionally, the expansion mechanism further comprises a power source, an inlet of the shunt tube is communicated with an outlet of the power source, and the power source can convey high-pressure hydraulic oil or high-pressure gas into each expansion unit through the shunt tube, so that the expansion units are expanded and fixed on the insertion holes.

Optionally, the expansion mechanism further comprises:

and the inlet of the two-position two-way electric control valve is communicated with the outlet of the power source, and the outlet of the two-position two-way electric control valve is communicated with the inlet of the flow dividing pipe.

Optionally, at least two flange plates are arranged on the outer side wall of the battery module, the two flange plates are oppositely distributed on two sides of the battery module, and a plurality of insertion holes are formed in each flange plate.

Optionally, the number of the flange plates is two, the battery module is rectangular, one of the two opposite outer side walls of the battery module is provided with one of the flange plates, and the other of the two opposite outer side walls of the battery module is provided with the other of the flange plates.

Optionally, the expansion unit comprises:

the plug-in column is fixedly connected to the flow dividing pipe at one end, the other end of the plug-in column can penetrate through the plug-in hole, a cavity communicated with a pipeline of the flow dividing pipe is formed in the plug-in column, and a plurality of through holes communicated with the cavity are annularly arranged on the peripheral wall of one end, penetrating through the plug-in hole, of the plug-in column;

the elastic expansion assemblies are arranged on the through holes in a sealing mode in a one-to-one correspondence mode, and when the expansion single body expands, the elastic expansion assemblies can partially extend out of the peripheral wall of the inserting column and tightly press against the lower end face of the inserting hole;

and the limiting flange is convexly arranged on the side wall of the inserting column, and the lower end surface of the limiting flange can be abutted against the upper end surface of the inserting hole.

Optionally, the elastic expansion assembly comprises:

the elastic sealing element is arranged on one end of the through hole in a sealing mode, and the end is communicated with the cavity;

the steel balls are accommodated in the through holes and can partially extend out of the peripheral wall of the inserting column, and when the expansion single body expands, the steel balls are pressed against the hole wall of one end, not provided with the elastic sealing element, of each through hole, so that the steel balls can be pressed against the lower end face of the inserting hole.

Optionally, the battery module includes:

the module shell is provided with the insertion holes;

a plurality of battery cells loaded in the module case.

An object of the utility model is to provide an electric motor car, the tight fixing device that expands of battery module on the electric motor car can realize the loading and unloading of battery module fast and change, practices thrift the change time, improves user experience.

To achieve the purpose, the utility model adopts the following technical proposal:

the electric vehicle comprises a vehicle frame, wherein the vehicle frame is provided with the battery module expansion fixing device.

Optionally, the shunt tube and the frame are integrally formed.

The utility model has the advantages that:

the utility model discloses an among the battery module fastening device that expands, be provided with a plurality of cartridge holes on the battery module, the shunt tubes sets up on the frame, and the tight monomer that expands on the shunt tubes can expand tightly and be fixed in the cartridge hole on the battery module, and then fixes the battery module on the frame. And when the free tight power of expanding of cancellation, the tight monomer that expands then can not fix in the cartridge hole at the tight, and then the battery module can drop from the frame fast, so it can realize the fast loading and unloading of battery module fast, practices thrift the change time, improves user experience.

Drawings

Fig. 1 is a schematic structural view of the expansion mechanism of the expansion fixing device for battery modules according to the present invention when separated from the battery modules;

fig. 2 is a schematic structural view of the expansion mechanism and the battery module provided by the present invention during expansion connection;

FIG. 3 is an enlarged partial schematic view at A in FIG. 2;

fig. 4 is a schematic view of a disassembled structure of the expansion unit provided by the present invention;

fig. 5 is a cross-sectional view of the expansion unit with steel balls hidden.

In the figure:

1-a battery module; 11-insertion holes; 12-a flange plate;

2-a tensioning mechanism; 21-a shunt tube; 22-expansion monomer; 221-inserting columns; 2211-chamber; 2212-through holes; 222-an elastic sealing member; 223-steel balls; 224-position-defining flange.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1-3, the battery module tightening and fixing device of the present embodiment is mainly used to achieve quick assembly and disassembly of a battery module at the bottom of a frame (not shown in the drawings) of an automobile, improve assembly and disassembly speed, and save replacement time, wherein an X direction represents a first direction parallel to a horizontal plane, a Y direction represents a second direction parallel to the horizontal plane, the Y direction and the X direction are perpendicular to each other, and a Z direction represents a vertical direction. The battery module tight fixing device that expands includes battery module 1 and tight mechanism 2 that expands. The battery module 1 is provided with a plurality of insertion holes 11, and the axis of each insertion hole 11 extends along the vertical direction; the expansion mechanism 2 comprises a shunt pipe 21 arranged on the frame, a plurality of expansion units 22 communicated with the shunt pipe 21 are arranged on the shunt pipe 21, each expansion unit 22 can be inserted into each insertion hole 11 in a one-to-one correspondence mode, and the expansion units 22 are configured to be capable of being expanded and fixed in the insertion holes 11, so that the battery module 1 is locked and assembled on the frame.

When the battery module 1 needs to be loaded, a worker can transport the battery module 1 to the position right below the frame through a transport device (not shown in the figure), and enables the insertion holes 11 on the battery module 1 to be opposite to the expansion monomers 22 on the shunt tubes 21 one by one, and at the moment, the expansion monomers 22 are in a state without expansion and expansion force; then, under the lifting and conveying of the conveying device, the battery module 1 is pushed into the frame from bottom to top to be used for loading the battery module 1; at this time, the expansion units 22 are inserted into the insertion holes 11 in a one-to-one correspondence. Then, the expansion pressure is conveyed into each expansion unit 22, and the expansion units 22 are expanded and fixed in the insertion holes 11 through the expansion and expansion effects of the expansion units 22, so that the rapid assembly of the battery module 1 is finally realized. When the battery module 1 needs to be unloaded, the transportation device only needs to be parked under the battery module 1; then the expansion force in each expansion unit 22 is cancelled, the battery module 1 can automatically fall off to the transportation device under the action of gravity, and the unloading is quick and time-saving. The expansion unit 22 of the shunt tube 21 of the present embodiment can be tightly fixed to the insertion hole 11 of the battery module 1, thereby fixing the battery module 1 to the vehicle frame. And when tight monomer 22 that expands the tight power of expanding cancellation, tight monomer 22 that expands then can not fix in cartridge hole 11 expanding tightly, and then battery module 1 can drop from the frame fast, so its fast loading and unloading that can realize battery module fast practices thrift the change time, has improved user experience.

As shown in fig. 1-2, in the present embodiment, the battery module 1 has a rectangular parallelepiped shape, and two flange plates 12 are provided on the battery module 1. One of the flange plates 12 is provided on one of the opposite outer side walls of the battery module 1 in the first direction; along the first direction, another flange plate 12 is disposed on another outer sidewall of two opposite outer sidewalls of the battery module 1, the length of each flange plate 12 extends along the second direction, a plurality of insertion holes 11 are formed on each flange plate 12 at intervals along the second direction, and eight insertion holes are formed on each flange plate 12 in this embodiment. Correspondingly, fixed shunt tubes 21 that set up on the frame also have two, and two shunt tubes 21's length all extends along the second direction, and two shunt tubes 21 set up on the frame along the first direction interval side by side, and then two shunt tubes 21 can with the position one-to-one of two flange plates 12 on the battery module 1. The tightening mechanism 2 of the present embodiment is tightened to the flange plates 12 on both sides of the battery module 1, so that the battery module 1 is fixed to the vehicle frame in a balanced and stable manner. In other embodiments, four side walls of the battery module 1 may be respectively provided with one flange plate 12, each flange plate 12 is respectively provided with a plurality of insertion holes 11, four corresponding shunt tubes 21 are also provided, the four shunt tubes 21 correspond to the four flange plates 12 one by one, and the battery module 1 can be tightly connected around the battery module 1, so that the battery module 1 can be more stably fixed.

As shown in fig. 3-5, in this embodiment, the expansion unit 22 includes a post 221, a plurality of elastic expansion members and a retaining flange 224. One end of the inserting column 221 is fixedly connected to the shunt tube 21 in a welding manner, the diameter of the inserting column 221 is smaller than the aperture of the inserting hole 11, the other end of the inserting column 221 can penetrate through the inserting hole 11, and a cavity 2211 communicated with the pipeline of the shunt tube 21 is formed in the inserting column 221. In this embodiment, cavity 2211 is opened in one end of inserting the not connected shunt tubes 21 of post 221, and simultaneously, vertical intercommunication pipeline (not marked in the figure) has been seted up along the axis direction on inserting post 221, the one end intercommunication shunt tubes 21 of vertical intercommunication pipeline, the other end of vertical intercommunication pipeline stretches into bottom position department in cavity 2211, and the one of stretching into cavity 2211 of vertical intercommunication pipeline is served along the radial direction of vertical intercommunication pipeline and has been seted up the export, and then make cavity 2211 be linked together through the pipeline of vertical intercommunication pipeline with shunt tubes 21. The insertion column 221 is provided with a plurality of through holes 2212 which are communicated with the chambers 2211 circularly through the peripheral wall of one end of the insertion hole 11; the elastic expansion assemblies are hermetically arranged on the through holes 2212 in a one-to-one correspondence manner, and when the expansion units 22 expand, the elastic expansion assemblies can partially extend out of the peripheral wall of the plug column 221 and tightly press against the lower end face of the plug hole 11. Specifically, the resilient expansion assembly includes a resilient seal 222 and a steel ball 223. The elastic sealing pieces 222 are arranged on one end of the through hole 2212, which is communicated with the cavity 2211, in a sealing way in a one-to-one correspondence way; the steel balls 223 are correspondingly accommodated in the through holes 2212. The bottom of the cavity 2211 is opened with a bottom opening, and when the assembly of the elastic sealing member 222 and the steel ball 223 is completed, the bottom opening of the cavity 2211 can be sealed by welding a bottom sealing block (not shown).

More specifically, in the present embodiment, as shown in fig. 3 to 5, the elastic expansion assemblies have five elastic sealing members 222 and five steel balls 223, in other embodiments, the elastic expansion assemblies may be one, two, three, four or six or more elastic expansion assemblies, the limiting flange 224 has an annular structure, the limiting flange 224 is protruded around the outer peripheral wall of the plug 221, and may be welded or integrally formed with the plug 221, and in this embodiment, the limiting flange 224 and the plug 221 are integrally formed. Meanwhile, in order to enable the steel ball 223 to move in the corresponding through hole 2212 and partially protrude from the outer circumferential wall of the plug column 221, in the present embodiment, the diameter of the steel ball 223 is larger than the aperture of the end of the through hole 2212 where the elastic sealing member 222 is not hermetically disposed. In order to ensure that the cavity 2211 of the expansion unit 22 is always in a sealed state and prevent the pressure in the cavity 2211 from being released through the through hole 2212, the elastic sealing member 222 of this embodiment is made of elastic rubber, and the shape of the elastic sealing member is approximately spherical shell-shaped, the open end of the housing of the elastic sealing member 222 is fixed to one end of the through hole 2212, which is communicated with the cavity 2211, in an interference fit manner, a receiving space for receiving the steel ball 223 is formed between the opening of the housing of the elastic sealing member 222 and the through hole 2212, the steel ball 223 can be movably assembled in the receiving space, because the steel ball 223 cannot be expanded out of the through hole 2212, the open end of the housing of the elastic sealing member 222 is fixed to one end of the through hole 2212, which is in an interference fit manner, and the pressure in the cavity 2211 cannot.

When the expansion unit 22 expands, as shown in fig. 5, in this embodiment, hydraulic oil is used as high-pressure gas or high-pressure hydraulic oil, that is, hydraulic oil flows into the vertical communication pipeline of the plug column 221 through the shunt tube 21 and finally flows into the chamber 2211, so that the pressure in the chamber 2211 increases, and each elastic sealing member 222 transmits the expansion force to each steel ball 223, so that each steel ball 223 presses against the hole wall of the end of each through hole 2212 where the elastic sealing member 222 is not disposed. Therefore, under the action of the expansion pressure in the cavity 2211, the steel balls 223 are pressed against the hole wall of the through hole 2212 at the end where the elastic sealing element 222 is not arranged, so that the steel balls 223 cannot move, and further, the steel balls 223 can be pressed against the lower end surface of the insertion hole 11; the limiting flange 224 is protruded on the outer side wall of the insertion column 221, and the lower end surface of the limiting flange 224 can abut against the upper end surface of the insertion hole 11, so that the expansion unit 22 is finally expanded and fastened in the insertion hole 11. When the expansion force is removed, although the steel ball 223 can abut against the lower end surface of the insertion hole 11 under the elastic support of the elastic sealing member 222, the elastic sealing member 222 can elastically deform and loses the support of the expansion pressure in the cavity 2211, so that when the steel ball 223 extends out of one end of the peripheral wall of the insertion column 221 and is subjected to extrusion force from the lower end surface of the insertion hole 11, the elastic sealing member 222 can deform, and meanwhile, the steel ball 223 can retract into the through hole 2212, so that the support force cannot be generated on the lower end surface of the insertion hole 11, the battery assembly 1 can automatically fall off under the action of gravity, and the battery module 1 can be rapidly disassembled.

For the generation of the expansion force of the expansion units 22, the expansion mechanism 2 of the present embodiment further includes a power source and an electric control device (not shown in the figure) in the prior art, an inlet of the shunt tube 21 is communicated with an outlet of the power source, and the power source can deliver high-pressure hydraulic oil or high-pressure gas into the chambers 2211 formed on each expansion unit 22 through the shunt tube 21, so that the expansion units 22 are expanded and fixed on the insertion holes 11. Specifically, this embodiment adopts the hydraulic pressure principle, and the power supply includes hydraulic pump and oil tank, and electrically controlled device is connected with hydraulic pump is automatically controlled, and the import of hydraulic pump and the export intercommunication of oil tank, hydraulic pump's export are passed through hydraulic line and shunt tubes 21's entry intercommunication, and the hydraulic pump is used for sending the hydraulic oil in the oil tank to in each bloated tight monomer 22's the cavity 2211, and then provides the tight pressure that expands for the bloated tightness of steel ball 223. In other embodiments, the air pressure expansion principle may also be adopted, the power source includes a high-pressure air tank and a high-pressure air delivery pipe, the electric control device is electrically connected with the high-pressure air tank to control the delivery of the high-pressure air, and the high-pressure air tank is communicated with the shunt pipes 21 through the high-pressure air delivery pipe to also play a role in driving the steel balls 223 to expand. Since the principles and control circuits of hydraulic drive and pneumatic drive are prior art, they are not described in detail.

Further, in order to effectively maintain the expansion pressure in the cavity 2211 of each expansion unit 22, in this embodiment, the expansion mechanism 2 further includes a two-position two-way electric control valve (not shown). Wherein, the inlet of the two-position two-way electric control valve is communicated with the outlet of the hydraulic pump, and the outlet of the two-position two-way electric control valve is communicated with the inlet of the shunt pipe 21. When high-pressure hydraulic oil needs to be conveyed into each cavity 2211 for expansion connection, the two-position two-way electric control valve is firstly in an open state and is kept in the open state for a certain time, such as 3-5 seconds; when the hydraulic pump pumps high-pressure hydraulic oil into each cavity 2211, and the steel ball 223 is pressed against the hole wall of the end, not provided with the elastic sealing element 222, of each through hole 2212 and cannot move, the two-position two-way electric control valve is automatically closed when reaching the closing time, so that the pressure in each cavity 2211 is locked, and the pressure maintaining effect is achieved. At this time, the hydraulic pump also stops working, and the locking work of the battery module 1 on the frame by the tightening mechanism 2 is completed. When battery module 1 is dismantled to needs pressure release, two-position two-way electric control valve opens, and the hydraulic pump does not work, and the pressure in each cavity 2211 alright accomplish the pressure release along the route of shunt tubes 21, hydraulic pump, oil tank this moment, and tight monomer 22 that expands no longer expands tightly connects battery module 1, and battery module 1 breaks away from under the action of gravity automatically, and then accomplishes the dismantlement work.

In addition, the battery module 1 of the present embodiment includes a module case and a plurality of battery cells (not shown in the drawings). Each plug-in hole 11 is opened on the module casing, and each battery monomer directly loads in the module casing, and it has cancelled the battery box shell design of current battery package, has simplified the packing, has practiced thrift the space of frame bottom greatly. Moreover, each battery cell is directly loaded in the module case to form an integrated single module, instead of designing a plurality of small modules, and then each small module is loaded in the battery box case, which is beneficial to improving the energy density of the battery module 1 and reducing the overall weight. In addition, in the present embodiment, the flange plate 12 is integrally formed with the module case of the battery module 1, so that the number of parts is reduced, and the manufacturing process and the assembly workload are simplified, thereby reducing the manufacturing cost.

In addition, this embodiment has still provided an electric motor car, and the electric motor car includes the frame, is equipped with the tight fixing device that expands of battery module that this embodiment provided on the frame, and it can realize battery module 1's fast loading and unloading, effectively saves the change time.

Further, in order to reduce the occupied space of the shunt pipe 21 of the expansion mechanism 2 on the frame, the design material is saved, and the design cost is further reduced. The shunt tube 21 and the frame of the electric vehicle in the embodiment are integrally formed. The shunt pipe 21 and the frame are integrally formed, so that the space for loading the battery module 1 at the bottom of the frame can be effectively saved, and further space is provided for the design and assembly of the battery module 1 with larger volume; meanwhile, a hydraulic cavity for containing hydraulic oil is directly formed in the frame, so that the use of pipes can be saved, and the overall design cost is reduced.

In addition, on the premise of ensuring that the frame has enough strength, the weight of the frame is reduced, the running energy consumption is further reduced, and the endurance mileage of the electric vehicle is improved. In this embodiment, the frame integrally formed with the shunt tube 21 is made of high-strength aluminum alloy. Therefore, the weight of the frame can be greatly reduced, and the effects of saving energy, reducing consumption and improving the endurance mileage are achieved.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims (10)

1. The utility model provides a battery module tight fixing device that expands which characterized in that includes:

the battery module (1) is provided with a plurality of insertion holes (11), and the axis of each insertion hole (11) extends along the vertical direction;

the expansion mechanism (2) comprises a shunt pipe (21) arranged on a frame, a plurality of expansion monomers (22) communicated with the shunt pipe (21) are arranged on the shunt pipe (21), the expansion monomers (22) can be correspondingly inserted into the insertion holes (11), and the expansion monomers (22) are configured to be capable of being expanded and fixed in the insertion holes (11), so that the battery module (1) is tightly locked and assembled on the frame.

2. The battery module expansion fixing device according to claim 1, wherein the expansion mechanism (2) further comprises a power source, an inlet of the shunt pipe (21) is communicated with an outlet of the power source, and the power source can deliver high-pressure hydraulic oil or high-pressure gas into each expansion unit (22) through the shunt pipe (21) to expand and fix the expansion unit (22) on the insertion hole (11).

3. The battery module tightening fixture according to claim 2, wherein the tightening mechanism (2) further comprises:

and the inlet of the two-position two-way electric control valve is communicated with the outlet of the power source, and the outlet of the two-position two-way electric control valve is communicated with the inlet of the shunt pipe (21).

4. The expansion fixing device of any one of claims 1-3, wherein at least two flange plates (12) are disposed on the outer side wall of the battery module (1), and the two flange plates (12) are oppositely disposed on two sides of the battery module (1), and each flange plate (12) is provided with a plurality of insertion holes (11).

5. The battery module expansion fixing device according to claim 4, wherein the number of the flange plates (12) is two, the battery module (1) has a rectangular parallelepiped shape, one of the two opposite outer side walls of the battery module (1) is provided with one flange plate (12), and the other of the two opposite outer side walls of the battery module (1) is provided with the other flange plate (12).

6. The battery module expansion fixing device according to claim 1, wherein the expansion unit (22) comprises:

the plug-in column (221) is fixedly connected to the flow dividing pipe (21) at one end, the other end of the plug-in column can penetrate through the insertion hole (11), a cavity (2211) communicated with the pipeline of the flow dividing pipe (21) is formed in the plug-in column (221), and a plurality of through holes (2212) communicated with the cavity (2211) are annularly arranged on the peripheral wall of one end, penetrating through the insertion hole (11), of the plug-in column (221);

the elastic expansion assemblies are arranged on the through holes (2212) in a sealing mode in a one-to-one correspondence mode, and when the expansion single body (22) expands, the elastic expansion assemblies can partially extend out of the peripheral wall of the plug column (221) and tightly press against the lower end face of the plug hole (11);

and the limiting flange (224) is arranged on the side wall of the inserting column (221) in a protruding mode, and the lower end face of the limiting flange (224) can abut against the upper end face of the inserting hole (11).

7. The battery module tensioning and fixing device of claim 6, wherein the elastic tensioning assembly comprises:

an elastic sealing member (222) which is arranged on one end of the through hole (2212) communicated with the cavity (2211) in a sealing way;

and the steel balls (223) are accommodated in the through holes (2212), the steel balls (223) can partially extend out of the peripheral wall of the inserting column (221), and when the expansion single body (22) expands, the steel balls (223) are pressed against the hole wall of one end, which is not provided with the elastic sealing element (222), of each through hole (2212), so that the steel balls (223) can be pressed against the lower end face of the inserting hole (11).

8. The battery module expansion fixing device according to claim 1, wherein the battery module (1) comprises:

the module shell is provided with the insertion holes (11);

a plurality of battery cells loaded in the module case.

9. An electric vehicle comprising a frame, wherein the frame is provided with the battery module expansion fixing device as claimed in any one of claims 1 to 8.

10. An electric vehicle as claimed in claim 9, characterized in that the shunt tube (21) is provided integrally with the frame.

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