CN218586244U - Battery device - Google Patents

Abstract

The application provides a battery device, which comprises an end plate, a support and a fixing component; one part of the end plate and the support is provided with a limiting groove, and the other part of the end plate and the support is provided with a limiting structure; the limiting groove is fixedly connected with the limiting structure through the fixing part. In the technical scheme, the fixing of the limiting groove and the limiting structure is realized by fixing the limiting groove and the limiting structure by the fixing part, so that the mounting firmness of the support and the end plate in the battery module is improved; meanwhile, the problem that the installation is too tight or too loose due to the fact that the interference ribs are cut in the interference connection process in the interference connection mode is solved. The connection mode of parts among the battery device that this application provided can install and dismantle many times, is convenient for change the part among the battery device.

Description

Battery device

Technical Field

The present application relates to the field of batteries, and more particularly, to a battery device.

Background

With the improvement of global environmental awareness, electric vehicles are increasingly popularized as new energy green travel vehicles; with the increasing support of new energy electric vehicles and charging infrastructures in the country, planning and deployment are performed from the aspects of top-level design, policy support and the like, electric vehicles are coming to the rapid development period, and then electric vehicles become a popular direction for the current industrial development of vehicles.

The current electric automobile adopts the electric energy stored by the storage battery as the power energy, along with the development of the electric automobile, the batteries of the main components of the electric automobile are also rapidly developed, and the battery device applied to the electric automobile at present adopts a plurality of battery modules to form a battery pack. The end plate and the holder of the battery device are one of the core members of the battery device.

However, in the prior art, the support and the end plate are connected through interference ribs, and the connection mode has low fault tolerance and often causes over-loose or over-tight assembly; and the interference rib of the support is cut by the metal of the end plate in the interference installation of metal and nonmetal, so that only one-time installation can be realized, and the problem of partial loose installation caused by the falling of the interference rib in the interference rib cutting process is solved.

SUMMERY OF THE UTILITY MODEL

The application provides a battery device for improve the fastness of support and end plate installation among the battery device.

The present application provides a battery device including an end plate, a holder, and a fixing member; one part of the end plate and the support is provided with a limiting groove, and the other part of the end plate and the support is provided with a limiting structure; the limiting groove is fixedly connected with the limiting structure through the fixing part. In the technical scheme, the fixing of the limiting groove and the limiting structure is realized by fixing the limiting groove and the limiting structure by the fixing part, so that the mounting firmness of the support and the end plate in the battery device is improved; meanwhile, the problem that the support and the end plate are assembled too loosely or too tightly is solved.

Drawings

Fig. 1 is a schematic structural diagram of a battery device according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of the basic structure of a prior art battery device;

fig. 3 is a schematic diagram illustrating that a support and an end plate of the battery device according to the embodiment of the present disclosure are inserted and removed along a first direction;

fig. 4 is a schematic view of a support structure in a battery device provided in an embodiment of the present application;

fig. 5 is a front view of an end plate structure in a battery device provided by an embodiment of the present application;

fig. 6 is a rear front view of a support and an end plate in a battery device provided by an embodiment of the present application;

FIG. 7 is an enlarged view of a portion A of FIG. 6 according to an exemplary embodiment of the present disclosure;

FIG. 8 is a schematic view of a structure of a limiting groove in a support according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a limiting structure in an end plate according to an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a fixing member provided in an embodiment of the present application;

fig. 11 is a schematic structural view of a first buffer and a second buffer provided in the present application;

fig. 12 is a schematic perspective view of an end plate in a battery device according to an embodiment of the present disclosure.

In the figure: 1. a support; 11. a limiting groove; 12. a card slot; 13. a first tank body; 14. a second tank body; 15. a first buffer member; 16. a second buffer member; 17. a limiting post; 2. an end plate; 21. a limiting structure; 211. a limiting rod; 212. a limiting end part; 22. a limiting hole; 3. a fixing member; 31. a limiting plate; 32. a connecting member; 33. avoiding the clamping piece; 34. a through groove; 321. a limiting bulge; 322. a support member; 111. a trench wall; 5. a support in the prior art; 6. prior art endplates.

Detailed Description

The present application is described in further detail below with reference to the figures and examples. The features and advantages of the present application will become more apparent from the description.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not conflict with each other.

The battery device provided by the application can be but is not limited to a battery module and a battery pack.

In order to facilitate understanding of the battery device provided in the embodiments of the present application, the overall structure of the battery device will be described first.

Referring to fig. 1, a battery device provided in an embodiment of the present application includes a basic structure including an end plate 2, a holder 1, and a fixing member 3. However, as shown in fig. 2, the existing battery device includes only two basic structures, namely, an end plate 6 and a support 5, in the prior art, when the end plate 6 and the support 5 are assembled, interference ribs between the support 5 and the end plate 6 are mostly adopted for connection, but such a connection mode has high requirements on manufacturers, has low fault tolerance, and often causes that the support 5 and the end plate 6 are assembled too loosely or too tightly; if one of the parts in the support 5 or the end plate 6 is made of metal, and the other part provided with the interference rib is made of nonmetal, in the interference installation process of the support 5 and the end plate 6, the interference rib made of nonmetal is cut by the other part made of metal, so that only one-time installation can be realized, and the interference rib cutting process causes the interference rib to fall off, so that the installation is loose partially. Therefore, the embodiment of the application provides a battery device, which is used for improving the mounting firmness of a support 1 and an end plate 2 in the battery device; meanwhile, the problem that the support 1 is assembled with the end plate 2 too loosely or too tightly is solved. The following detailed description is made with reference to the specific drawings and examples.

Referring to fig. 1, fig. 3, fig. 4, fig. 5, and fig. 7 together, fig. 3 shows a schematic diagram of inserting and removing a holder 1 and an end plate 2 in a first direction in a battery device provided in an embodiment of the present application, fig. 4 shows a schematic diagram of a structure of the holder 1 in the battery device provided in the embodiment of the present application, fig. 5 shows a schematic diagram of a structure of the end plate 2 provided in the embodiment of the present application, and fig. 7 shows a partially enlarged view of the holder 1 and the end plate 2 in the battery device provided in the embodiment of the present application after being inserted.

In the end plate 2 and the support 1 of the embodiment of the application, one part is provided with a limiting groove 11, and the other part is provided with a limiting structure 21; the limiting groove 11 is fixedly connected with the limiting structure 21 through the fixing part 3. In a specific implementation manner of this embodiment, the limiting groove 11 is disposed at an end of the support 1 close to the end plate 2 along the plugging direction, and an opening direction faces the end plate 2; the limiting structure 21 is arranged at the end part of the end plate 2 close to the support 1 along the plugging direction; after the limiting groove 11 and the limiting structure 21 are spliced, the fixing part 3 is used for fixing, so that the overall firmness of the battery device is improved, and the condition that the support and the end plate are assembled loosely or tightly is also improved. It should be understood that, in the above example, the description has been made by taking an example in which the stopper groove 11 is provided at the end of the holder 1 close to the end plate 2 in the inserting and extracting direction, and the stopper structure 21 is provided at the end of the end plate 2 close to the holder 1 in the inserting and extracting direction. However, in other specific embodiments in the embodiment of the present application, an embodiment may also be adopted in which the limiting groove 11 is disposed at an end of the end plate 2 close to the support 1 in the inserting and extracting direction, and the limiting structure 21 is disposed at an end of the support 1 close to the end plate 2 in the inserting and extracting direction.

The first direction in fig. 3 is the inserting and pulling direction of the support 1.

The limiting groove 11 and the limiting structure 21 are inserted to form a clamping groove 12, and the fixing part 3 is inserted into the clamping groove 12 to fixedly connect the limiting groove 11 and the limiting structure 21. The assembly of the limiting groove 11 and the limiting structure 21 will be described with reference to the specific drawings.

Referring to fig. 1, 3, 4, 5, 6 and 7 in combination, fig. 6 shows a front view of the battery device after the holder 1 is inserted into the end plate 2, and fig. 7 shows a partial enlarged view of a portion a in fig. 6.

The structure of the limiting structure 21 is not specifically limited in the embodiments of the present application, and the limiting structure 21 is a cross structure capable of playing a clamping function, such as: cross, T, Y, X, L structures; in a specific implementation manner in the embodiment of the present application, the overall structure of the limiting structure 21 is a T-shaped structure, when the limiting structure 21 is inserted into the limiting groove 11, the limiting structure 21 is partially located in the limiting groove 11, and a part of the groove wall 111 of the limiting groove 11 and a part of the limiting structure 21 located in the limiting groove 11 enclose a clamping groove 12; the structure of the card slot 12 is not specifically limited in the embodiment of the present application, and the card slot 12 may be an L-shaped structure or other accommodating structures capable of clamping the limiting structure 21.

Wherein, limit structure 21 can be for components of parts fixed connection form also can be integrated into one piece parts, prefers to select integrated into one piece parts.

The fixing part 3 is clamped in the clamping groove 12, and two opposite sides of the fixing part 3 along the first direction are respectively in one-to-one corresponding butt joint with part of the groove wall 111 of the limiting groove 11 and part of the limiting structure 21 in the limiting groove 11; because in a specific implementation manner of the embodiment of the present application, the card slot 12 is an accommodating cavity having a horizontal direction and a vertical direction, and the fixing component 3 is a T-shaped cross structure, two crossed portions of the fixing component 3 are respectively inserted into the accommodating cavities of the card slot 12 in the horizontal direction and the vertical direction, so as to perform a good fixing function. If the slot 12 is a receiving cavity of another type in some embodiments, the fixing member 3 is correspondingly configured to be inserted into the slot 12 and fix the limiting groove 11 and the limiting structure 21.

Referring to fig. 3, 7, 8 and 10 together, fig. 8 shows a schematic structural view of the limiting groove 11 provided in the embodiment of the present application, and fig. 10 shows a schematic structural view of the fixing member 3 provided in the embodiment of the present application.

The structure of the limiting groove 11 is not particularly limited in the embodiments of the present application, and the limiting groove 11 may be a "convex" structure or other structure having a plurality of receiving chambers, receiving the limiting structure 21, and being capable of being inserted into the fixing part 3. In a specific implementation manner of the embodiment of the present application, the limiting groove 11 includes a first groove body 13 and a second groove body 14 which are communicated with each other; the first groove body 13 is far away from the end part of the support 1 close to the end plate 2 along the plugging direction, and the width of the first groove body 13 is smaller than that of the second groove body 14; adopt above-mentioned scheme, first cell body 13's width is less than second cell body 14's width, and after limit structure 21 and first cell body 13 butt completely, the chamber that holds that second cell body 14 and limit structure 21's partial structure enclose can insert fixed part 3, improves among the battery device support 1 and end plate 2's fastness.

The second direction in fig. 8 is the width direction of the first tank body 13 and the second tank body 14.

Specifically, the limiting structure 21 is partially inserted into the first groove body 13, and partially inserted into the second groove body 14; the groove wall 111 of the second groove body 14, the part of the limiting structure 21 inserted into the first groove body 13 and the part of the limiting structure 21 inserted into the second groove body 14 enclose a clamping groove 12, and the fixing component 3 can be inserted into the clamping groove 12 to fixedly connect the support 1 and the end plate 2 in the battery device. The limiting structure 21 will be described with reference to the specific drawings.

Referring to fig. 4, 7, 9 and 10 in combination, fig. 9 shows a schematic structural diagram of the limiting structure 21 in the end plate 2 according to the embodiment of the present application, and fig. 10 shows a schematic structural diagram of the fixing component 3 according to the embodiment of the present application.

In a specific implementation manner of the embodiment of the present application, the limiting structure 21 includes a limiting rod 211 and a limiting end 212; the limiting rod 211 is fixed at one end of the end plate 2 facing the support 1, and part of the limiting rod 211 is inserted into the second groove body 14;

the limiting end part 212 is fixed at one end of the limiting rod 211 far away from the end plate 2, and the limiting end part 212 is inserted into the first groove body 13;

the partial structure of the limiting end 212 and the limiting rod 211 located in the second groove body 14 and the groove wall 111 of the second groove body 14 enclose a clamping groove 12.

By adopting the above technical scheme, after the limiting end part 212 is inserted into the first groove body 13, the partial structure of the limiting rod 211 is inserted into the second groove body 14, the partial structure of the limiting end part 212 facing the second groove body 14, the partial structure of the limiting rod 211 located in the second groove body 14 and the groove wall 111 of the second groove body 14 enclose the clamping groove 12, and the fixing part 3 can be conveniently inserted into the clamping groove 12 to fixedly connect the limiting structure 21 with the limiting groove 11.

Referring to fig. 1, fig. 3, fig. 7, fig. 8 and fig. 9, in particular, in an embodiment of the present application, the limiting rod 211 and the limiting end 212 form a T-shaped limiting structure 21;

the number of the two retaining grooves 12 defined by the partial structure of the retaining end 212 and the retaining rod 211 located in the second groove body 14 and the groove wall 111 of the second groove body 14 is two, and the two retaining grooves 12 are split at two opposite sides of the retaining rod 211. The fixing member 3 will be described below with reference to the accompanying drawings.

Referring to fig. 1, 3, 7, 8, 9 and 10 in combination, in particular, in a specific implementation of the embodiment of the present application, the fixing component 3 includes a limiting plate 31 that is snapped into each card slot 12. The external structural shape of the limiting plate 31 is the same as the space shape of the containing cavity in the clamping groove 12; after the limiting end 212 is inserted into the first groove body 13, the partial structure of the limiting rod 211 is inserted into the second groove body 14, the limiting end 212 faces the partial structure of the second groove body 14, the limiting rod 211 is located in the partial structure of the second groove body 14 and the groove wall 111 of the second groove body 14 form the clamping groove 12 in a surrounding mode, when the limiting plate 31 is inserted into the clamping groove 12, the partial structure of the limiting end 212 faces the limiting plate 31 and abuts against the partial structure of the limiting end 212, the partial structure of the limiting plate 31 inserted into the clamping groove 12 abuts against each groove wall 111 inside the clamping groove 12, the limiting plate 31 fixedly abuts against the limiting end 212 in the first groove body 13, and further, the fixed connection between the support 1 and the end plate 2 is achieved.

Adopt above-mentioned technical scheme, insert by spacing tip 212 towards the partial structure of second cell body 14 through limiting plate 31, gag lever post 211 is located the partial structure of second cell body 14 and the draw-in groove 12 that the cell wall 111 of second cell body 14 encloses, the fastness that support 1 and end plate 2 are connected has been improved, and then the stability of battery device at the in-process of transport has been guaranteed, the problem of too tight or too loose installation that the interference muscle that causes with the mode of interference connection is cut and lead to at the in-process of interference connection has also been improved simultaneously, the connected mode among the embodiment's the embodiment in this application can be installed and dismantled many times, be convenient for change the part among the battery device.

The number of the card slots 12 and the number of the limiting plates 31 are not unique, and the embodiment of two card slots 12 and two limiting plates 31 is preferred; the number of the card slots 12 and the limiting plate 31 should be equal.

Specifically, in another specific implementation manner in the embodiment of the present application, when the number of the card slots 12 is two, the number of the limiting plates 31 is two, and the fixing component 3 further includes a connecting member 32 connecting the two limiting plates 31. After the limiting end part 212 is inserted into the first groove body 13, part of the limiting rod 211 is inserted into the second groove body 14, the part of the limiting end part 212 facing the second groove body 14, the part of the limiting rod 211 located in the second groove body 14 and the groove wall 111 of the second groove body 14 enclose a clamping groove 12, when the limiting plate 31 is inserted into the clamping groove 12, the part of the limiting plate 31 facing the limiting end part 212 abuts against the part of the limiting end part 212, the part of the limiting plate 31 inserted into the clamping groove 12 abuts against each groove wall 111 inside the clamping groove 12, and the limiting end part 212 is fixedly abutted against the first groove body 13 by the limiting plate 31; since the connecting member 32 is disposed at the connecting end portion of the two position-limiting plates 31, when the position-limiting plates 31 are completely inserted into the slots 12, the connecting member 32 also abuts against the limiting rod 211, and further, the fixed connection between the support 1 and the end plate 2 is further enhanced.

Adopt above-mentioned technical scheme, through setting up the end connection of connecting piece 32 with two limiting plates 31, restricted limiting plate 31 and inserted the inside length of draw-in groove 12, when having avoided not setting up connecting piece 32, limiting plate 31 inserts the back from draw-in groove 12 one end, along with battery device's transport, jolt, limiting plate 31 is at the inside not hard up other end roll-off from draw-in groove 12 of draw-in groove, leads to the not hard up problem of being connected of support 1 and end plate 2.

In a specific implementation manner in the embodiment of the present application, the fixing part 3 is provided with a limiting protrusion 321 on the side facing the support 1 at the end where the connecting piece 32 is located; spacing arch 321 is spacing to be connected with support 1, and after support 1 and end plate 2 passed through fixed part 3 fixed connection, owing to set up spacing arch 321 on the surface of fixed part 3 and the contact of support 1, at battery device transport, the difficult pine of follow between support 1 and the end plate 2 of in-process fixed part 3 that jolts takes off, the landing, has further improved between the battery device inner part and whole battery device's stability.

In another specific embodiment in the embodiment of the present application, the fixing member 3 is provided with a support 322 on the side of the connecting member 32 facing the end plate 2, and the support 322 abuts against the end plate 2. Adopt above-mentioned technical scheme, support 1 passes through fixed part 3 fixed connection back with end plate 2, connecting piece 32 one side and spacing tip 212 butt in the fixed part 3, connecting piece 32 opposite side is provided with support piece 322, support piece 322 and end plate 2 butt, can further restrict fixed part 3 and support 1, end plate 2 assembly accomplishes the back, connecting piece 32 one end slightly rocks in 1 plug orientation of support in the fixed part 3, because battery device is carrying in the battery device among the battery device 1 with end plate 2 assembly back, the in-process of jolting appears not hard up the problem.

Specifically, in another specific implementation manner in the embodiment of the present application, the fixing component 3 further includes an avoiding clip 33 abutting against the limiting rod 211, and the avoiding clip 33 is fixedly connected to the connecting piece; when the limit plates 31 are inserted into the slots 12, the connecting piece 32 for connecting the two limit plates 31 in the fixing part 3 abuts against the limit rod 211; if it dodges 33 connecting piece 32 of fastener and direct and the gag lever post 211 butt not to set up, because the width of gag lever post 211 can set up different width as required, connecting piece 32 is many times with gag lever post 211 butt or along with battery device's motion, jolt, connecting piece 32 all has wearing and tearing with gag lever post 211 butt position to support 1 can become flexible gradually with being connected of end plate 2.

The avoiding clamping piece 33 is arranged in the specific implementation mode in the embodiment of the application, one end, facing the limiting rod 211, of the avoiding clamping piece 33 is set to be in a shape matched with the peripheral outline of the limiting rod 211, when the limiting plate 31 is inserted into the clamping groove 12, the avoiding clamping piece 33 is closely abutted to the limiting rod 211, and the problem that the connection between the support 1 and the end plate 2 is loose is further improved in the moving and bumping process of the whole battery device.

In particular, in another specific implementation manner of the embodiment of the present application, the fixing component 3 further includes a through slot 34; the through-groove 34 is used to receive the stopper 211 when the fixing member 3 is inserted into the inside of the catching groove 12.

Referring to fig. 1, fig. 3, fig. 4, fig. 5, fig. 7, fig. 9, fig. 11, and fig. 12 in combination, fig. 11 shows a schematic structural diagram of a first buffer and a second buffer provided in an embodiment of the present application, and fig. 12 shows a schematic structural diagram of an end plate in a battery device provided in an embodiment of the present application.

Specifically, in one specific implementation manner in the embodiment of the present application, a first buffer 15 is disposed in the first groove 13 toward the end plate 2, and is used for buffering the compression between the first groove 13 and the limiting end 212. When the support 1 is inserted into the end plate 2, the limiting structure 21 abuts against the first groove body 13, the limiting end part 212 in the limiting structure 21 extrudes the groove wall of the first groove body 13, and the first buffer member 15 is arranged in the first groove body 13 towards the end plate 2, so that the first buffer member 15 is compressed under pressure in the process of inserting the support 1 into the end plate 2; after support 1 and end plate 2 are pegged graft and are accomplished, insert draw-in groove 12 through fixed part 3 inside with support 1 and end plate 2 fixed, first bolster 15 turns to the reverse effort of recovery in-process release by compression state, can be connected more firmly with support 1 and end plate 2, realizes seamless connection, has further improved battery device's steadiness.

After the fixing component 3 is inserted into the slot 12, the width of the remaining gap between the slot wall of the first buffer 15 and the limiting end 212 of the first slot body 13 is smaller than the thickness of the first buffer 15 in resilience.

The specific material of the first buffer member 15 is not exclusive, and compressed foam is preferred.

Specifically, in another specific implementation manner in the embodiment of the present application, the end of the seat 1 close to the end plate 2 in the first direction is further provided with a second buffer 16; the second cushion member 16 serves to cushion the compression between the mount 1 and the end plate 2. When the support 1 is inserted into the end plate 2, one end of the support 1 facing the end plate 2 is abutted against one end of the end plate 2 facing the support 1 and is extruded; the end part of the support 1 close to the end plate 2 along the first direction is provided with a second buffer 16, so that the second buffer 16 is compressed by pressure in the process of inserting the support 1 and the end plate 2; after support 1 and end plate 2 are pegged graft and are accomplished, insert draw-in groove 12 inside through fixed part 3 and fix support 1 and end plate 2, second bolster 16 turns to the reverse effort of release among the recovery process by compression state, can be connected more firmly with support 1 and end plate 2, realizes seamless connection, has further improved battery device's steadiness.

After the support 1 and the end plate 2 are inserted, the width of the residual gap between the support 1 and the end plate 2 is smaller than the rebound thickness of the second buffer 16.

The second cushioning member 16 is preferably made of compressed foam, although this is not the only material.

Specifically, in another specific implementation manner in the embodiment of the present application, the end of the support 1 close to the end plate 2 in the first direction is provided with a limiting column 17; a limiting hole 22 is formed in the end part, close to the support 1, of the end plate 2 along the first direction; the limiting column 17 is inserted into the limiting hole 22.

Adopt above-mentioned technical scheme, when support 1 pegs graft with end plate 2, support 1 towards the one end of end plate 2 and the in-process of end plate 2 towards the one end butt of support 1, spacing post 17 inserts spacing hole 22, further reinforcing the fastness that support 1 and end plate 2 are connected to the removal on the horizontal direction after support 1 is connected with end plate 2 has been restricted.

In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on operational states of the present application, and are only used for convenience in describing and simplifying the present application, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise explicitly stated or limited. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The present application has been described above with reference to preferred embodiments, but these embodiments are merely exemplary and merely illustrative. On the basis of the above, the present application can be subjected to various substitutions and modifications, which are all within the scope of protection of the present application.

Claims (14)

1. A battery device is characterized by comprising an end plate, a support and a fixing component; one part of the end plate and the support is provided with a limiting groove, and the other part of the end plate and the support is provided with a limiting structure; the limiting groove is fixedly connected with the limiting structure through the fixing part.

2. The battery device according to claim 1, wherein the limiting groove is arranged at an end of the support close to the end plate in the plugging and unplugging direction, and the opening direction of the limiting groove faces the end plate; the limiting structure is arranged at the end part of the end plate close to the support in the plugging direction;

the limiting structure is partially positioned in the limiting groove, and a part of groove wall of the limiting groove and a part of structure of the limiting structure positioned in the limiting groove form a clamping groove;

the fixing part is clamped in the clamping groove, and two opposite sides of the fixing part along the first direction are respectively in one-to-one corresponding butt joint with part of groove walls of the limiting groove and part of structures of the limiting structure in the limiting groove;

the first direction is the plugging and unplugging direction of the support.

3. The battery device according to claim 2, wherein the limiting groove has a structure of a shape like a Chinese character 'tu'; the limiting groove comprises a first groove body and a second groove body which are communicated; the first groove body is far away from the end part of the support close to the end plate along the plugging direction, and the width of the first groove body is smaller than that of the second groove body;

the limiting structure is partially inserted into the first groove body and partially inserted into the second groove body; and the groove wall of the second groove body, the part of the limiting structure inserted into the first groove body and the part of the limiting structure inserted into the second groove body are encircled to form the clamping groove.

4. The battery device of claim 2, wherein the retention structure is integrally formed with the end plate.

5. The battery device of claim 3, wherein the retention structure comprises:

the limiting rod is fixed at one end, facing the support, of the end plate, and the limiting rod is partially inserted into the second groove body;

the limiting end part is fixed at one end of the limiting rod, which is far away from the end plate, and the limiting end part is inserted into the first groove body;

the limiting end, the part of the limiting rod, which is positioned on the second groove body, and the groove wall of the second groove body are enclosed to form the clamping groove.

6. The battery device according to claim 5, wherein the limiting rod and the limiting end part form a T-shaped limiting structure;

the limiting end part, the part of the limiting rod, which is positioned on the second groove body, and the groove wall of the second groove body are enclosed, the number of the clamping grooves is two, and the two clamping grooves are split at two opposite sides of the limiting rod.

7. The battery device according to any one of claims 2 to 6, wherein the fixing member includes a stopper plate that is caught to each of the catching grooves.

8. The battery device according to claim 7, wherein when the number of the catching grooves is two, the number of the limiting plates is two, and the fixing member further includes a connecting member connecting the two limiting plates.

9. The battery device according to claim 8, wherein when the stopper structure includes a stopper rod, the fixing member further includes an escape catch abutting against the stopper rod; the avoiding clamping piece is fixedly connected with the connecting piece.

10. The battery device according to claim 8, wherein the fixing member further comprises a stopper protrusion provided on a side of an end of the connecting member facing the holder.

11. The battery device according to claim 8, wherein the fixing member further includes a support member provided on a side of the connecting member facing the end plate, and the support member abuts against the end plate.

12. The battery device according to claim 7, wherein when the limiting structure includes a limiting end portion, a first buffer member is disposed in the limiting groove toward the end plate to buffer the compression between the limiting groove and the limiting end portion.

13. The battery device according to claim 7, wherein a second buffer member is further provided on an end portion of the holder in the first direction, the end portion being close to the end plate; the second buffer member is used for buffering the extrusion between the support and the end plate.

14. The battery device according to claim 7, wherein the end of the support near the end plate in the first direction is further provided with a limiting column; a limiting hole is further formed in the end part, close to the support, of the end plate along the first direction; the limiting column is inserted into the limiting hole.

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