CN219779063U - Battery device - Google Patents

Abstract

The utility model discloses a battery device, which comprises a battery and an insulating bracket, wherein the insulating bracket is arranged on the outer surface of the battery; the battery is provided with a flange structure, the insulating bracket is provided with a groove part, and the groove part is used for accommodating the flange structure; the clamping piece is arranged in the groove part and is used for being abutted against the flange structure so as to prevent the flange structure from being separated from the groove part. According to the insulating support provided by the utility model, the clamping piece is arranged on the contact surface of the groove part and the flange structure, and can clamp the flange structure in the groove part, so that the flange structure is prevented from being separated from the groove part, the connection between the insulating support and a battery is not firm, and the insulating failure is caused.

Description

Battery device

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery device.

Background

At present, the battery comprises a battery cell and a shell assembly, after the battery cell is assembled, the battery shell and a cover plate are assembled, and the battery shell and the cover plate are connected by welding in the related art, but due to the structural limitation of the battery shell and the cover plate, the welding effect of the battery shell and the cover plate is poor.

Therefore, the flange edge is arranged at the opening end of the battery shell or the circumferential outer edge of the cover plate, and when the battery shell is connected with the cover plate, the flange edge of the battery shell and the flange edge of the cover plate are welded together, or the cover plate and the flange edge of the battery shell are welded, so that the welding area can be increased; not only is convenient for welding, but also the stability after welding is higher.

The flange edge protrudes out of the surface of the shell of the battery, so that the battery is easy to be damaged by collision or the insulating property of the battery is easy to be influenced; the prior art will provide an insulating support on the outer surface of the battery, which insulating support wraps at least part of the flange.

However, when the insulating support wraps the outer surface of the battery, the insulating support at the position of the flange edge of the battery has a tilting phenomenon, and is not tightly attached to the battery, so that the battery is separated from the insulating support, insulation failure is caused, and potential safety hazards exist.

Accordingly, there is a need for a battery device that overcomes the above-described drawbacks.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model aims to provide a battery device, wherein an insulating bracket can be closely attached to a flange structure of a battery, so that the flange structure is prevented from being separated from the insulating bracket, and meanwhile, the insulating bracket can play a role in supporting the battery.

The utility model adopts the following technical scheme:

a battery device comprises a battery and an insulating bracket, wherein the insulating bracket is arranged on the outer surface of the battery; the battery is provided with a flange structure, the insulating bracket is provided with a groove part, and the groove part is used for accommodating the flange structure; the clamping piece is arranged in the groove part and is used for being abutted against the flange structure so as to prevent the flange structure from being separated from the groove part.

Compared with the prior art, the utility model has the beneficial effects that:

in the battery device provided by the utility model, the insulating bracket arranged on the outer surface of the battery is provided with the groove part matched with the flange structure of the battery, the clamping piece is arranged in the groove part, and the flange structure of the battery can be clamped in the groove part by the clamping piece, so that the battery is tightly attached to the insulating bracket, and the connecting effect is enhanced.

Drawings

FIG. 1 is a schematic view of an insulating bracket according to the present utility model;

FIG. 2 is a schematic view of a part of the structure of embodiment 1 of the present utility model;

FIG. 3 is a schematic view of the structure of FIG. 2 from another perspective;

FIG. 4 is a schematic view showing a part of the structure of embodiment 2 of the present utility model;

FIG. 5 is a schematic view of the structure of FIG. 4 from another perspective;

FIG. 6 is a schematic view of a portion of another embodiment of FIG. 4;

FIG. 7 is a schematic diagram of the overall structure of the present utility model;

fig. 8 is a schematic view of the structure of a battery according to the present utility model;

FIG. 9 is a schematic view of the structure of FIG. 2 from another perspective;

in the figure: 1. a battery; 101. a flange structure; 102. a bottom surface; 103. a top surface; 104. a side surface; 105. an end face; 2. an insulating support; 201. a side portion; 202. an end portion; 203. a clamping hole; 204. diagonal rib members; 205. chamfering; 206. a buckle; 207. a groove portion; 208. protruding ribs; 209. a barb member.

Detailed Description

The utility model will be further described with reference to the accompanying drawings and detailed description below:

in the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Referring to fig. 1, 6 and 7, the utility model discloses a battery device, which comprises a battery 1 and an insulating bracket 2, wherein the battery 1 comprises a battery core and a shell component, and the battery core is assembled in the shell component; the insulating bracket 2 is arranged on the outer surface of the battery 1, wherein the outer surface refers to the side of the shell component, which is away from the battery core; the insulating support 2 is arranged on the outer surface of the battery 1 in a surrounding mode, and short circuit can be avoided when adjacent batteries 1 are contacted.

The battery 1 is provided with a flange structure 101, and the flange structure 101 is arranged at the joint of the battery 1 shell and the shell cover plate; in order to avoid the flange structure 101 from being damaged by collision or to affect the insulating performance of the battery 1, a groove portion 207 is provided on the side of the insulating holder 2 facing the battery 1, and the groove portion 207 can accommodate the flange structure 101 while the insulating holder 2 wraps the outer surface of the battery 1.

Referring to fig. 2 to 5, a clamping member is provided in the groove portion 207, and after the groove portion 207 accommodates the flange structure 101, the clamping member is used to clamp the flange structure 101, preventing the flange structure 101 from being separated from the groove portion 207, so that the connection between the insulating holder 2 and the battery 1 is not tight.

Based on the structure, with the battery 1 device of the utility model, the side of the insulating bracket 2 provided with the groove part 207 faces the battery 1, the groove part 207 is connected corresponding to the flange structure 101 of the battery 1, and other parts of the insulating bracket 2 are surrounded on the outer surface of the battery 1; after the insulating holder 2 is assembled with the battery 1, the clamping members of the groove portion 207 abut against the flange structure 101 of the battery 1, and the flange structure 101 is fixed in the groove portion 207.

In this way, while the insulating support 2 wraps the outer surface of the battery 1, the clamping member of the groove portion 207 also clamps the flange structure 101 in the groove portion 207, so that the insulating support 2 is tightly attached to the battery 1; even if the insulating holder 2 is tilted at a part of the position where the battery 1 is wrapped, the insulating holder 2 can be closely attached to the battery 1 through the groove 207, enhancing the connection effect, thereby preventing the insulating holder 2 from being separated from the battery 1, and causing insulation failure.

The insulating bracket 2 also plays a role in supporting and fixing the batteries 1, and when the batteries 1 are bumped from outside, the batteries 1 can be fixed in the battery 1 box by the insulating bracket 2, so that the batteries 1 are prevented from collision with each other; when the battery 1 is extruded externally, the insulating bracket 2 deforms to absorb a part of acting force, so that the battery 1 is buffered and supported for protection.

It should be noted that, the flange structure 101 may be a flange edge, a step or a protrusion, or other structures, which satisfies that the flange structure 101 and the edge of the cover plate of the housing are welded together;

since the structure of the case of the battery 1 may be composed of the bottom surface 102, the top surface 103, the two side surfaces 104, and the two end surfaces 105 together surrounding the battery cell, the flange structure 101 may be disposed along at least one of the bottom surface 102, the top surface 103, the two side surfaces 104, and the two end surfaces 105 of the battery 1.

Based on the structure, the insulating bracket 2 comprises a first bracket and a second bracket, wherein the first bracket comprises two side parts 201 and two end parts 202, the two side parts 201 are distributed on the two end faces 105 of the battery 1, and the two side parts 201 are distributed on the two side faces 104 of the battery 1;

the end part 202 is provided with a clamping hole 203, the side part 201 is provided with a buckle 206, and the clamping hole 203 is in buckling connection with the buckle 206, so that the insulating bracket 2 is surrounded on the outer surface of the battery 1; wherein the flange structure 101 of the battery 1 is accommodated in the groove portion 207 of the insulating holder 2.

In addition, the insulating holder 2 may partially wrap or entirely wrap the outer surface of the battery 1, and when the insulating holder 2 partially wraps the outer surface of the battery 1, the insulating holder 2 is in contact with at least one of the bottom surface 102, the top surface 103, the two side surfaces 104, and the two end surfaces 105 of the battery 1, and the contact surface of the insulating holder 2 and the battery 1 is provided with the groove portion 207 described above.

The battery 1 is not covered with the outer surface of the insulating bracket 2, which is more beneficial to heat dissipation of the battery 1, thereby improving the service performance of the battery 1.

Likewise, the insulating holder 2 can partially or entirely accommodate the flange structure 101, i.e., when the flange structure 101 is entirely covered with the groove portion 207, electrical connection of the flange structure 101 with external components can be directly avoided.

In the case where the flange structure 101 is partially covered with the groove portion 207, since the insulating holder 2 has a certain thickness, it is possible to prevent the uncovered portion from being electrically connected to an external member to some extent even after the battery 1 is assembled.

In addition, the clamping members may be raised structures along the side walls of the groove portion 207, or other structures such as adhesive assemblies, snap assemblies, etc. that secure the flange structure 101 within the groove portion 207.

Further, referring to fig. 2 and 3, the groove portion 207 has an open end and a sidewall, and the clip is provided on the sidewall of the groove portion 207; the clamping piece is a protruding rib 208, and the protruding rib 208 extends from the opening end of the groove part 207 to a port far away from the opening end; the protruding ribs 208 are provided protruding on the side walls of the groove portion 207, and the protruding ribs 208 are used to abut against the flange structure 101, exerting pressure on the flange structure 101 to prevent the flange structure 101 from being detached from the groove portion 207.

On the basis of this structure, when the battery 1 and the insulating holder 2 are assembled, the flange structure 101 of the battery 1 extends into the groove portion 207 from the open end of the groove portion 207 of the insulating holder 2, and in the groove portion 207, the protruding ribs 208 on the side wall of the groove portion 207 press the flange structure 101, so that the flange structure 101 is relatively firmly clamped in the groove portion 207, thereby preventing the insulating holder 2 from being separated from the battery 1.

Wherein, protruding rib 208 extends to the port that keeps away from the open end of recess portion 207, because flange structure 101 also stretches into the port that keeps away from the open end of recess portion 207, protruding rib 208 arranges along the installation direction of flange structure 101, more is convenient for flange structure 101 and recess portion 207 installation cooperation.

Further, the protruding rib 208 may be provided with a slope on an end near the open end of the groove portion 207, the slope being inclined toward an end far from the open end; thus, when the flange structure 101 is mounted, the end of the protruding rib 208 near the opening end can guide the flange structure 101 to extend into the groove portion 207, so that the flange structure 101 and the groove portion 207 can be mounted conveniently.

In addition, the protruding ribs 208 may be distributed on one side wall of the groove portion 207, or may be distributed on both side walls of the groove portion 207; the protruding ribs 208 may be arranged at intervals along the length direction of the side wall, or may be arranged continuously along the length direction of the side wall.

Further, referring to fig. 4 and 5, the clamping member may be a barb member 209, where the barb member 209 is convexly disposed on a sidewall of the groove portion 207, and the barb member 209 is configured to abut against the flange structure 101, press and hook the flange structure 101, and prevent the flange structure 101 from being separated from the open end of the groove portion 207.

On the basis of the structure, when the battery 1 and the insulating bracket 2 are assembled, the flange structure 101 of the battery 1 extends into the groove part 207 from the opening end of the groove part 207 of the insulating bracket 2, and in the groove part 207, the barb piece 209 on the side wall of the groove part 207 presses the flange structure 101, so that the flange structure 101 is firmly clamped in the groove part 207; the barb 209 can catch the edge of the flange structure 101 when the flange structure 101 tends to move toward the outside of the open port, thereby preventing the insulating holder 2 from being detached from the battery 1.

Thus, the barbs 209 on the side walls of the groove 207 can press the flange 101, so that the flange 101 is firmly clamped in the groove 207; the barb portion of the barb 209 is disposed away from the open end of the groove portion 207, so that the barb 209 is able to hook the edge of the flange structure 101 as the flange structure 101 moves toward the outside of the open port, thereby preventing the flange structure 101 from being disengaged from the open end.

Wherein, in order to better cooperate with the barb element 209, the edge of the flange structure 101 may be further provided with a convex edge, so that when the flange structure 101 cooperates with the groove portion 207, the barb element 209 can simultaneously press and hook the flange structure 101, thereby fixing the flange structure 101 in the groove portion 207 and hooking the flange structure 101 when the flange structure 101 moves out of the open end.

Further, referring to fig. 4 and 5, the barb 209 has a first slope and a second slope protruding from the sidewall, and the first slope intersects with the second slope; the first inclined surface is gradually inclined from one end close to the open end to one end far away from the open end toward a side wall far away from the groove portion 207, and can guide the flange structure 101 to extend into the groove portion 207, so that the flange structure 101 and the groove portion 207 are mounted.

On the basis of the structure, the flange structure 101 stretches into the groove part 207 and is contacted with the first inclined plane, and the inclination of the first inclined plane facilitates the flange structure 101 to stretch into the groove part 207;

as the first inclined surface is inclined gradually toward the side wall away from the groove portion 207 from the end near the open end to the end away from the open end, the second inclined surface intersecting the first inclined surface is also inclined gradually toward the side wall away from the groove portion 207 from the end near the open end to the end away from the open end; in this case, since the mounting direction of the flange structure 101 is from the opening end of the groove 207 to the port far from the opening end, both the first inclined surface and the second inclined surface are inclined in the mounting direction of the flange structure 101.

Thus, the barb 209 formed by the first inclined surface and the second inclined surface gradually decreases in thickness from one end on the side wall to one end where the first inclined surface and the second inclined surface intersect, and the intersection of the first inclined surface and the second inclined surface is the part with the smallest thickness, so that the barb has certain deformability and elasticity.

As the flange structure 101 enters the groove portion 207, the barb 209 presses the flange structure 101 more and more significantly, and the intersection of the first and second inclined surfaces deforms, so that the flange structure 101 can enter the groove portion 207 under the pressing of the barb 209, away from the port of the open end.

Thus, while the first inclined surface facilitates the protrusion of the flange structure 101 into the groove portion 207, as the flange structure 101 is protruded, the flange structure 101 is more and more pressed by the barb 209, so that the flange structure 101 is easily installed into the groove portion 207 and is not easily detached.

The second inclined surface is located at the inner side of the first inclined surface, and the second inclined surface is gradually inclined from one end close to the open end to one end far away from the open end towards the side wall far away from the groove portion 207, so that the second inclined surface forms a barb portion, and when the flange structure 101 moves towards the open end, a barb portion is formed between the second inclined surface and the side wall at an interval, and hooks the flange structure 101, so that the flange structure is not easy to separate.

In addition, referring to fig. 6, the barb 209 may be an inclined rib 204, where the inclined rib 204 is disposed on the sidewall, and gradually inclines from one end near the open end to one end far from the open end toward the sidewall far from the groove 207; the end portions of the diagonal ribs 204 remote from the side walls are spaced apart from the side walls to form barbs.

On the basis of this structure, since the inclination direction of the diagonal rib 204 coincides with the installation direction of the flange structure 101, the diagonal rib 204 can guide the flange structure 101 to extend into the groove portion 207; since one end of the diagonal rib 204 is fixed to the side wall, the other end of the diagonal rib 204 is spaced from the side wall, and therefore, when the flange structure 101 passes through the end portion of the diagonal rib 204 away from the side wall, the end portion is pressed toward the direction of the side wall, and the diagonal rib 204 is deformed by the pressing, so that the flange structure 101 is fitted into the port of the groove portion 207 away from the open end by the diagonal rib 204.

In this way, after the flange structure 101 is installed into the groove portion 207 by the diagonal rib 204, since the barb portion exists on the side of the diagonal rib 204 away from the open end, the flange structure 101 is hooked by the barb portion when moving toward the open end, so that the flange structure 101 is not easy to disengage from the groove portion 207

In addition, two diagonal ribs 204 may be provided, the two diagonal ribs 204 being arranged at intervals along the open end toward the port away from the open end, such that a side of the two diagonal ribs 204 near the open end is capable of guiding the flange structure 101 to be installed into the groove portion 207, and an end away from the side wall is respectively formed with two barb portions at intervals with the side wall, the two barb portions jointly interfering with the flange structure 101 to protrude from the groove portion 207; the connection effect between the insulating holder 2 and the battery 1 is enhanced.

The clip may be other structures that can secure the flange structure 101 within the groove 207, such as a snap-fit structure.

Further, the clamping member may be made of an insulating material, and may specifically be made of a plastic material.

On the basis of the structure, the clamping piece can be formed by extrusion molding of the insulating bracket 2; since the plastic material can be deformed, when the flange structure 101 is installed in the groove portion 207, the flange structure 101 firstly extends into the gap between the clamping members on the two sides, and the clamping members are extruded in the extending process, so that the installation gap becomes large after the clamping members are deformed, and after the flange structure 101 is extruded between the clamping members on the two sides, the clamping members extrude the flange structure 101 in the process of recovering the original shape, so that the flange structure 101 is clamped in the groove portion 207.

Further, the elastic modulus of the clamping piece is 1000-6000 MPa.

On the basis of this structure, the flange structure 101 has a lower strength due to the fact that the flange structure 101 is provided as a flange edge or other convex edge with a smaller thickness. When the flange structure 101 is inserted into the groove portion 207, if the elastic modulus of the material from which the clip is made is too high, the clip is not easily deformed, i.e., the hardness of the clip is high, and when the flange structure 101 is installed, the flange structure 101 is easily deformed by being squeezed between the clip on both side walls due to the high hardness of the clip, so that the flange structure 101 is bent or damaged.

Therefore, the material from which the clip is made requires a certain elastic force to grip the flange structure 101. In this way, when the flange structure 101 is assembled with the groove portion 207, the flange structure 101 presses the clamping members on both sides, so that the clamping members are elastically deformed and then are pressed between the two clamping members, and the clamping members on both sides can restore the original shape due to elasticity, and the flange structure 101 is pressed in the process of restoring the original shape, so that the flange structure 101 is fixedly installed in the groove portion 207.

In order to prevent the material of the clamping member from being too soft or too hard, the elastic modulus of the material of which the clamping member is made is set to be 1000-6000 MPa, if the elastic modulus of the material is too small, the material is easy to crumple and deform, and the structure is easily damaged after deformation and loses elasticity in the extrusion process with the flange structure 101;

if the elastic modulus of the material is too high, the formed clamping piece is too hard in material and weak in elastic deformation capability, and is difficult to maintain interference fit with the flange under the shaking working condition when being assembled with the flange structure 101, and the flange is easy to damage and is unfavorable for installation when being hard-bumped and hard-extruded in the installation process.

Specifically, the material of the clamping member may be a rubber material, the rubber material has a certain deformability and elasticity, and when the clamping member is assembled with the flange structure 101, the clamping member is extruded by the flange structure 101 to elastically deform, so that the flange structure 101 is extruded between the clamping members on two sides, and the clamping member abuts against and presses the flange structure 101 in the process of restoring the original shape, so that the flange structure 101 is installed in the groove part 207 and is not easy to separate. The clamping member does not damage the flange structure 101 during installation, but can clamp it relatively firmly.

Further, the clamping member is a cushion foam, and the cushion foam is attached to the side wall of the groove portion 207, so that the cushion foam can abut against the flange structure 101 and press the flange structure 101.

On the basis of the structure, the buffer foam is made of soft materials, has light weight and certain elasticity, and can be continuously attached to the side wall of the groove part 207 or attached to the side wall at intervals along the length direction of the groove part 207.

When the flange structure 101 stretches into the groove part 207 during assembly, the buffer foam can deform, so that an avoidance space stretching into the groove part 207 is provided for the flange structure 101, and after the flange structure 101 is installed, the buffer foam is restored to the original shape and is extruded for preventing the flange structure 101 from being separated from the groove part 207.

In addition, since the buffer foam is detachably attached in the groove portion 207, if the buffer foam is worn and damaged, the buffer foam can be replaced, and the reduction of the clamping capability of the clamping member is avoided.

Further, referring to fig. 2-5, the open end of the groove portion 207 is provided with a chamfer 205, which chamfer 205 may be used to guide the mounting of the flange structure 101 into the groove portion 207.

Since the flange structure 101 is thin, the flange structure 101 is clamped between the two side walls of the groove 207, and the space between the two side walls of the groove 207 is small, it is difficult to position the flange structure 101 and the open end of the groove 207 when the flange structure 101 with a thin thickness is inserted into the groove 207 during assembly.

Therefore, a chamfer 205 structure may be provided at the open end of the groove 207, and the chamfer 205 may be a round chamfer, and since the round chamfer structure has a certain arc, when the flange structure 101 is installed, the flange structure 101 is outside the groove 207 and can slide into the open end along the arc of the chamfer 205 structure, so that a positioning connection between the flange structure 101 and the groove 207 can be achieved.

In addition, the chamfer 205 may be a chamfer, and the chamfer is disposed at the opening end, so that the entrance of the opening end can be enlarged, so that the flange structure 101 and the groove 207 can be positioned conveniently, and the flange structure 101 can be conveniently inserted into the groove 207.

Further, a chamfer 205 may be provided on either side of the open end of the groove portion 207, or a chamfer 205 may be provided on both sides of the open end of the groove portion 207.

Thus, compared to the right angle structure, the chamfer 205 enlarges the entrance of the groove portion 207, and when the flange structure 101 is to be installed into the groove portion 207, it is only necessary to place the flange structure 101 near the entrance of the groove portion 207, and then slide the flange structure 101 into the groove portion 207 along the arc section or the slope section of the chamfer 205, thereby improving the assembly efficiency.

In addition, the chamfers 205 are provided on both sides of the open end of the groove portion 207, so that the entrance of the groove portion 207 can be further enlarged, so that the flange structure 101 can slide into the groove portion 207 along the arc surface of the circular chamfer or the inclined surface of the inclined chamfer, whether on the upper side or the lower side of the open end of the groove portion 207, thereby facilitating the installation of the flange structure 101 with the groove portion 207;

the flange structure 101 is not easily separated from the groove 207 by the clamping piece. In this way, the connection effect between the flange structure 101 and the groove portion 207 can be improved.

The battery device in the present embodiment may be a battery pack or a battery pack, which is common in the prior art, in addition to the above-described battery 1 and battery pack.

It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the utility model as defined in the appended claims.

Claims (10)

1. A battery device, characterized by comprising a battery (1) and an insulating bracket (2), wherein the insulating bracket (2) is arranged on the outer surface of the battery (1); the battery (1) has a flange structure (101), the insulating holder (2) is provided with a groove portion (207), and the groove portion (207) is used for accommodating the flange structure (101); a clamping piece is arranged in the groove part (207) and is used for abutting against the flange structure (101) so as to prevent the flange structure (101) from being separated from the groove part (207).

2. The battery device according to claim 1, wherein the groove portion (207) has an open end and a side wall, the clip being provided on the side wall; the clip is a protruding rib (208), the protruding rib (208) extending from the open end to a port remote from the open end; the protruding ribs (208) are used for abutting against the flange structure (101) to prevent the flange structure (101) from being separated from the groove part (207).

3. The battery device according to claim 1, wherein the groove portion (207) has an open end and a side wall, the clip being provided on the side wall; the gripping member is a barb member (209), the barb member (209) being adapted to abut the flange structure (101) and to press the flange structure (101) to prevent the flange structure (101) from being disengaged from the open end.

4. A battery device according to claim 3, characterized in that the barb element (209) has a first slope and a second slope, the first slope intersecting the second slope; the first inclined surface is gradually inclined from an end close to the open end to an end far from the open end toward a side wall far from the groove portion (207) to guide the flange structure (101) to be mounted into the groove portion (207).

5. The battery device of any one of claims 1 to 4, wherein the clip is made of a plastic material.

6. The battery device according to any one of claims 1 to 4, wherein the elastic modulus of the clip is 1000 to 6000MPa.

7. The battery device according to claim 6, wherein the clip is a cushion foam attached to a side wall of the groove portion (207), the cushion foam being configured to abut against the flange structure (101) and press the flange structure (101) to prevent the flange structure (101) from being separated from the groove portion (207).

8. The battery device according to claim 1, characterized in that the open end of the groove portion (207) is provided with a chamfer (205), the chamfer (205) being used for guiding the mounting of the flange structure (101) into the groove portion (207).

9. The battery device according to claim 8, wherein either side of the open end of the groove portion (207) is provided with the chamfer (205).

10. The battery device according to claim 8, wherein both sides of the open end of the groove portion (207) are provided with the chamfer (205).