WO2021077257A1

WO2021077257A1 - Battery connector, battery assembly, and terminal

Info

Publication number: WO2021077257A1
Application number: PCT/CN2019/112243
Authority: WO
Inventors: 徐超; 苗利恒; 郑贤文; 邓俊; 王全搌
Original assignee: 海能达通信股份有限公司
Priority date: 2019-10-21
Filing date: 2019-10-21
Publication date: 2021-04-29

Abstract

A battery connector (100), a battery assembly (300) and a terminal (400). The battery connector (100) comprises at least one first electrode plate (121) insulated from each other. Each first electrode plate (121) comprises a first elastic arm (1211) and a planar support plate (1212). The first elastic arm (1211) comprises a deformed bent portion (12111) protruding outward from a plane in which the planar support plate (1212) is located. The battery connector (100) can prevent the terminal (400) from losing the charging power due to falling.

Description

Battery connector, battery assembly and terminal

【Technical Field】

This application relates to the field of terminal technology, and in particular to a battery connector, battery assembly and terminal.

【Background technique】

With the development of science and technology, the functions of the terminal have been greatly improved. In addition to the basic communication function, it also adds various new functions, such as Internet access and camera functions. With the improvement of various functions of the terminal, it has also become an indispensable part of people's daily life.

At present, the terminal energy is mainly based on the rechargeable battery carried by itself, and if the rechargeable battery is to provide energy for the terminal, a battery connector must be used. In the current terminal industry, one type of battery connector uses a single pole piece for charging and discharging. In this structure, when the terminal is dropped, the pole piece's instantaneous deformation causes the pole piece to separate from the battery assembly for longer than the capacitor's instantaneous discharge time. , Causing the terminal host to power down. Another structure is to use bipolar plates for charging and discharging. At this time, the instantaneous deformation of the bipolar plates is uncertain, which can reduce the probability of separation of the pole pieces and the battery assembly pole pieces, thereby reducing the probability of power failure of the terminal host. The structure still has the possibility that the terminal will lose power due to a drop.

[Summary of the invention]

In view of this, the present application provides a battery connector, a battery assembly, and a terminal, which can prevent the terminal from being powered off due to falling.

In order to solve the above technical problems, a technical solution adopted in this application is to provide a battery connector, including at least one mutually insulated first pole piece, the first pole piece including a first elastic arm and a plane support plate, so The first elastic arm includes a deformed bent portion, and the deformed bent portion protrudes outward from the plane where the plane support plate is located.

In order to solve the above technical problems, a technical solution adopted in this application is to provide a battery assembly including a battery main body and the aforementioned battery connector electrically connected to the output terminal of the battery main body.

In order to solve the above technical problems, a technical solution adopted in this application is to provide a terminal including a main circuit board, a first battery connector electrically connected to the main circuit board, a battery main body, and an output terminal of the battery main body. Connected second battery connector, the first battery connector and the second battery connector are the above-mentioned battery connectors, wherein the deformation of the first elastic arm of the first battery connector The bent portion abuts against the flat support plate of the second battery connector, and the deformed bent portion of the first elastic arm of the second battery connector abuts against the first battery connector. Plane support plate.

In order to solve the above technical problems, a technical solution adopted in this application is to provide a battery assembly comprising a battery main body, a discharge electrode sheet electrically connected to the output terminal of the battery main body, the discharge electrode sheet including a first area and a first area. In the second area, the first area is a flat area, and the second area is provided with an elastic sheet, the elastic sheet includes a deformed bent portion, and the deformed bent portion protrudes outward from the plane where the discharge electrode sheet is located.

In order to solve the above technical problems, a technical solution adopted in this application is to provide a terminal including a main circuit board, a battery connector electrically connected to the main circuit board, a battery body, and an output terminal of the battery body electrically connected The discharge electrode sheet, the battery connector is the above-mentioned battery connector, the discharge electrode sheet includes a first area and a second area, the first area is a flat area, and the second area is provided with an elastic sheet, so The elastic piece includes a deformed bent portion that protrudes outward from the plane where the discharge electrode piece is located, wherein the deformed bent portion of the first elastic arm of the battery connector abuts against the In the first area of the discharge electrode sheet, the deformed bent portion of the elastic sheet of the discharge electrode sheet abuts against the flat support plate of the battery connector.

The beneficial effect of the present application is that the battery connector in the present application includes a first elastic arm and a flat support plate by arranging the first pole piece, and the deformed bent portion of the first elastic arm outwards from the plane where the flat support plate is located. Protruding, so that the battery assembly and the terminal host can be connected through the mating of the two battery connectors, and in the mating of the two battery connectors, the first elastic arm in one battery connector abuts the plane of the other battery connector The support plate, so that no matter how the terminal is dropped, the first pole pieces in the two battery connectors can abut each other to prevent the terminal from being powered off due to the drop.

【Explanation of the drawings】

In order to more clearly describe the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained from these drawings without creative work. among them:

FIG. 1 is a schematic structural diagram of an embodiment of the battery connector of the present application;

Fig. 2 is a schematic diagram of the exploded structure of the battery connector in Fig. 1;

Figure 3 is a schematic diagram of two first pole pieces in the process of assembling two battery connectors;

4 is a schematic diagram of the first pole piece and the discharge electrode piece in the process of assembling the battery connector and the discharge electrode piece;

Fig. 5 is a schematic structural diagram of the first pole piece in Fig. 1 in an application scenario;

Fig. 6 is a schematic structural diagram of the first pole piece in Fig. 1 in another application scenario;

Fig. 7 is a schematic diagram of the connector in Fig. 1;

Figure 8 is a schematic diagram of two battery connectors in the process of assembling two battery connectors;

FIG. 9 is a schematic structural diagram of an embodiment of the battery assembly of the present application;

FIG. 10 is a schematic structural diagram of an implementation manner of a terminal of the present application;

11 is a schematic structural diagram of another embodiment of the battery assembly of the present application;

Figure 12 is a schematic view of the structure of the shrapnel in Figure 11;

FIG. 13 is a schematic structural diagram of another implementation manner of a terminal of the present application.

【Detailed ways】

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of this application.

1 to FIG. 2, FIG. 1 is a schematic structural diagram of an embodiment of the battery connector of the present application, and FIG. 2 is an exploded structural schematic diagram of the battery connector in FIG. 1. The battery connector 100 includes an upper cover 110, a first pole piece 121 and a lower cover 130.

The first pole piece 121 is used to electrically connect with the output terminal of the battery assembly. The number of the first pole piece 121 is at least one, such as two. The at least one first pole piece 121 is insulated from each other. Specifically, the first pole piece 121 may be arranged at intervals. , There is a predetermined distance for insulation, or an insulation material may be provided between them for insulation. The first pole piece 121 includes a first elastic arm 1211 and a flat support plate 1212. The first elastic arm 1211 includes a deformed bent portion 12111. The deformed bent portion 12111 protrudes outward from the plane where the flat support plate 1212 is located. When a force is applied, the deformed bent portion 12111 can be deformed, and when the external force disappears, the deformed bent portion 12111 returns to its original shape.

The battery connectors 100 can be used in pairs in the terminal. Specifically, one battery connector 100 is electrically connected to the main circuit board of the terminal host, and the other battery connector 100 is electrically connected to the output terminal of the battery body in the battery assembly. When the battery assembly is installed for the terminal host, the two battery connectors 100 abut each other, as shown in FIG. 3, which is a schematic diagram of the two first pole pieces of the two battery connectors 100 during the assembly process. Then, the deformed bent portion 12111 of the first elastic arm 1211 of one first pole piece 121 abuts against the plane support plate 1212 of the other first pole piece 121, so that when the terminal falls, regardless of the direction in which the terminal falls, it can be guaranteed The deformed bent portion 12111 of one first pole piece 121 abuts against the plane support plate 1212 of the other first pole piece 121, so as to prevent the terminal from being powered down due to falling.

Of course, only one battery connector 100 can also be used in the terminal. For example, one battery connector 100 is electrically connected to the main circuit board of the terminal host. In the battery assembly, the output terminal of the battery body is set to be electrically connected to the discharge electrode sheet, such as As shown in FIG. 4, at this time, the discharge electrode sheet 200 includes a first area 210 and a second area 220. The first area 210 is a flat area, and the second area 220 is provided with an elastic sheet 230. The elastic sheet 230 includes a deformed bent portion 231 and an elastic sheet 230. The deformed bent portion 231 protrudes outward from the plane where the discharge electrode sheet 200 is located. Similar to FIG. 3, in the process of installing the battery assembly for the terminal host, the deformed bent portion 12111 of the first elastic arm 1211 of the first pole piece 121 abuts the first area 210 of the electrode piece 200, and the elastic piece of the electrode piece 200 230 abuts against the flat supporting plate 1212 of the first pole piece 121, so as to ensure that the first pole piece 121 is in contact with the discharge electrode piece 200 regardless of the direction in which the terminal is dropped, so as to prevent the terminal from being powered off due to falling.

The first elastic arm 1211 can be arranged side by side with the plane support plate 1212 (Figure 5), or can be arranged end to end (as shown in Figure 6). Here, the relative position of the first elastic arm 1211 and the plane support plate 1212 not limited. At the same time, when the first elastic arm 1211 and the plane support plate 1212 are arranged side by side, other elements can be arranged between the first elastic arm 1211 and the plane support plate 1212, which are not limited here.

Specifically, the material of the first pole piece 121 is a metal material. By setting the material of the first pole piece 121 as a metal material, in addition to providing the first pole piece 121 with a conductive function, the first pole piece 121 can also have a good deformation recovery performance.

Continuing to refer to Figures 1 and 2, the upper cover 110 and the lower cover 120 are buckled and connected to form the housing of the battery connector 100, and at the same time, a accommodating cavity for accommodating at least one first pole piece 121 is formed. For ease of assembly, the upper cover 110 and the lower cover 120 can be detachably connected by a buckle, a screw, or the like. Specifically, the upper cover 110 is provided with at least one first through hole 111, and the first through hole 111 exposes at least part of the planar support plate 1212 and the deformed bent portion 12111 of the first elastic arm 1211, and the deformation of the first elastic arm 1211 is bent at the same time. The portion 12111 protrudes outward from the first through hole 111. Optionally, at the same time, the plane support plate 1212 is all contained in the accommodating cavity of the housing, and its surface is exposed through the first through hole 111.

Referring to FIGS. 5 to 6, FIGS. 5 to 6 are schematic diagrams of the structure of the first pole piece 121 in FIG. 1 in different application scenarios.

The first pole piece 121 includes a first elastic arm 1211 and a flat support plate 1212, and also includes a bottom plate 1213, which is connected to the lower cover 130. Specifically, the bottom plate 1213 covers a portion of the lower cover 130, and the lower cover 130 and The bottom plate 1213 can be connected by the cooperation of the boss and the through hole.

At this time, the first elastic arm 1211 and the flat support plate 1212 are located on the same side of the bottom plate 1213, and the bottom plate 1213 is connected to one end of the first elastic arm 1211 and one end of the flat support plate 1212 through the transition portion 1214, so that the first elastic arm 1211 , There is a predetermined distance between the plane support plate 1212 and the bottom plate 1213 respectively. Specifically, one end of the first elastic arm 1211 and one end of the planar support plate 1212 may be connected to both ends of the bottom plate 1213 respectively, or may be connected to the same end of the bottom plate 1213.

Continuing to refer to FIG. 2, the lower cover 130 is provided with at least one second through hole 131 so that at least part of the first pole piece 121 extends outward from the second through hole 131 or exposes at least part of the first pole piece 121. Specifically, when the battery connector 100 is electrically connected to the circuit board using the SMT (Surface Mount Technology, surface mount technology) process, at least a part of the first pole piece 121 extending outward from the second through hole 131 or passing through the At least a part of the first pole piece 121 exposed by the two through holes 131 is soldered on the circuit board, so as to realize the electrical connection between the first pole piece 121 and the circuit board.

Wherein, in the application scenarios of FIGS. 5 and 6, when the first elastic arm 1211, the planar support plate 1212 and the same end of the bottom plate 1213 are connected, the free end 12131 of the bottom plate 1213 extends outward from the second through hole 131, Specifically, the free end 12131 of the bottom plate 1213 extends to be parallel to the plane where the outer side wall of the lower cover 130 is located.

Of course, in other application scenarios, it may also be the free end of the first elastic arm 1211, that is, the end of the first elastic arm 1211 that is not connected to the bottom plate 1213 extends outward from the second through hole 131. Specifically, at this time, the first elastic arm 1211 The free end of the arm 1211 can also extend to be parallel to the plane where the outer side wall of the lower cover 130 is located.

When the battery connector 100 is electrically connected to the circuit board using the SMT process, the free end 12131 of the bottom plate 1213 or the free end of the first elastic arm 1211 can be directly welded to the circuit board, thereby realizing the connection between the first pole piece 121 and the main circuit board. Electric connection.

Optionally, in order to ensure the welding firmness of the battery connector 100 and the circuit board, referring to FIGS. 1, 2 and 7, the battery connector 100 further includes at least one connector 140.

The connecting member 140 includes a first flat plate 141 connected to the inner side wall of the lower cover 130, a second flat plate 142 standing perpendicular to the side of the first plate 141 and extending to the outside of the housing, and a second flat plate 142 standing perpendicular to the side of the second flat plate 142, and The third plate 143 is parallel to the first plate 141 opposite to the third plate 143, wherein the third plate 143 is attached to the outer wall of the lower cover 130. When welding the battery connector 100 on the circuit board, in addition to welding the free end 12131 of the bottom plate 1213 or the free end of the first elastic arm 1211 to the circuit board, the third plate 143 of the connecting member 140 can also be welded to the circuit board. Weld together to ensure the welding firmness of the battery connector 100 and the circuit board.

In an application scenario, the number of the first pole pieces 121 is two, and the two first pole pieces 121 are respectively used for electrical connection with the positive output terminal and the negative output terminal of the battery assembly. And as shown in FIG. 1, the two first pole pieces 121 are arranged in the same direction and side by side, and in each first pole piece 121, the first elastic arm 1211 and the plane support plate 1212 are arranged side by side.

In this application scenario, continue to refer to Figures 1 and 2, the battery connector 100 also includes a second pole piece 122 located between the two first pole pieces 121 and insulated from the first pole piece 121. The second pole piece 122 is available It is electrically connected to the temperature detection end of the battery assembly. The second pole piece 122 includes a second elastic arm 1221, and the deformed bent portion 12211 of the second elastic arm 1221 and the deformed bent portion 12111 of the first pole piece 121 have the same convex direction and extend to the same plane, that is, the first The outermost of the deformed bent portion 12111 of the elastic arm 1211 and the outermost of the deformed bent portion 12211 of the second elastic arm 1221 are on the same plane. At this time, when it is necessary to use two identical battery connectors 100 in pairs in the terminal, as shown in FIG. 8, the first pole piece 121 in one battery connector 100 abuts against the first pole piece 121 in the other battery connector 100. One pole piece 121, the second pole piece 122 in one battery connector 100 abuts against the second pole piece 122 in another battery connector 100, specifically, the first elastic arm 1211 of one first pole piece 121 abuts The plane supporting plate 1212 of the other first pole piece 121, and the second elastic arm 1221 of the second pole piece 122 abuts against the second elastic arm 1221 of the other second pole piece 122. Among them, the material of the second pole piece 122 is also a metal material.

It should be noted that in other embodiments, the number of the first pole piece 121 and the second pole piece 122 in the battery connector 100 may be other, and the relative positional relationship between the first pole piece 121 and the second pole piece 122 It may also be other. For example, the first pole piece 121 and the second pole piece 122 are arranged at intervals. In short, the present application does not limit the number and relative positional relationship of the first pole piece 121 and the second pole piece 122.

Referring to FIG. 9, FIG. 9 is a schematic structural diagram of an embodiment of the battery assembly of the present application. The battery assembly 300 includes a battery main body 310 and a battery connector 320 electrically connected to the output terminal of the battery main body 310. The battery connector 320 is the battery connector 100 in any one of the foregoing embodiments, and the detailed structure can be referred to the foregoing embodiment, which will not be repeated here.

Optionally, the battery assembly 300 further includes a battery circuit board 330. The battery circuit board 330 may be a flexible circuit board or a hard circuit board. Both ends of the battery circuit board 330 are connected to the battery main body 310 and the battery connector 320, respectively. Thus, the electrical connection between the battery main body 310 and the battery connector 320 is realized.

Referring to FIG. 10, FIG. 10 is a schematic structural diagram of an embodiment of a terminal of the present application. The terminal 400 includes a main circuit board 410, a first battery connector 420, and a battery assembly 430. The battery assembly 430 corresponds to the battery assembly in FIG. 9 The structure of 300 is the same, and the detailed structure can be referred to the above-mentioned embodiment. It specifically includes a battery main body 431 and a second battery connector 432, and the second battery connector 432 is electrically connected to the output terminal of the battery main body 431. Among them, the first battery connector 420 and the second battery connector 432 are the battery connector 100 in any one of the foregoing embodiments.

In the terminal 400, the deformed bent portion of the first elastic arm of the first battery connector 420 abuts against the plane support plate of the second battery connector 432, and the deformed bent portion of the first elastic arm of the second battery connector 432 The plane supporting plate abutting the first battery connector 420, wherein how the first battery connector 420 and the second battery connector 432 abut can be referred to FIG. 3, FIG. 9 and related content of the specification, which will not be repeated here.

Referring to FIG. 11, FIG. 11 is a schematic structural diagram of another embodiment of the battery assembly of the present application. The battery assembly 500 includes a battery main body 510, a discharge electrode sheet 520 and an elastic sheet 530.

The discharge electrode sheet 520 is electrically connected to the output terminal of the battery main body 510 and includes a first area 521 and a second area 522. The first area 521 is a plane area. The elastic sheet 530 is disposed on the second area 522, and the elastic sheet 530 is connected to the discharge electrode. The sheet 520 is electrically connected. As shown in FIG. 12, the elastic sheet 530 includes a deformed bent portion 531, and the deformed bent portion 531 protrudes outward from the plane where the discharge electrode sheet 520 is located.

12, the elastic sheet 530 also includes a bottom plate 532 and a transition portion 533. The bottom plate 533 is used to connect with the discharge electrode sheet 520. The transition portion 533 is used to connect the bottom plate 532 and the deformed bent portion 531. The transition portion 533 is provided so that the bottom plate There is a predetermined distance between 532 and the deformed bent portion 531.

In an application scenario, the bottom plate 532 has a flat structure, the transition portion 533 has an arched structure, and its end that is not connected to the bottom plate 532 is arranged parallel to the bottom plate 532, and the deformed bent portion 531 is not connected to the bottom plate 532 from the transition portion 533. The plane where one end is located protrudes outward.

In one application scenario, as shown in FIG. 12, the number of the discharge electrode sheets 520 is three, and the three discharge electrode sheets 520 are arranged side by side, and the elastic sheet 530 is not provided on the discharge electrode sheet 520 in the middle.

Referring to FIG. 13, FIG. 13 is a schematic structural diagram of another embodiment of a terminal of the present application. The terminal 600 includes: a main circuit board 610, a battery connector 620, and a battery assembly 630. The battery connector 620 is any one of the foregoing embodiments. The structure of the battery connector 100 and the battery assembly 630 is the same as that of the battery assembly 500 in the embodiment corresponding to FIG. 11. For details, please refer to the above-mentioned embodiment, which will not be repeated here.

In the terminal 600, the deformed bent portion of the first elastic arm of the battery connector 620 abuts against the first area of the battery assembly 630 where the electrode is placed, and the deformed bent portion of the elastic piece on the second area of the electrode abuts Flat support plate for battery connector. For how the battery connector 620 abuts against the electrode pads in the battery assembly 630, please refer to FIG. 4 and the contents of related manuals, which will not be repeated here.

It is worth noting that since the terminal 600 in FIG. 13 only uses one battery connector, its thickness is smaller than that of the terminal 400 in FIG. 10.

The above are only implementations of this application, and do not limit the scope of this application. Any equivalent structure or equivalent process transformation made using the content of the description and drawings of this application, or directly or indirectly applied to other related technologies In the same way, all fields are included in the scope of patent protection of this application.

Claims

A battery connector, which includes at least one mutually insulated first pole piece, the first pole piece includes a first elastic arm and a plane support plate, the first elastic arm includes a deformed bent portion, and the deformed bent The part protrudes outward from the plane where the plane support plate is located.
The battery connector according to claim 1, wherein:

The battery connector further includes a housing, the housing includes an upper cover and a lower cover, the upper cover is buckled on the lower cover to form an accommodating cavity for accommodating at least one of the first pole pieces, and The upper cover is provided with at least one first through hole, and the first through hole exposes at least part of the planar support plate and the deformed bent portion of the first elastic arm, and at the same time, all of the first elastic arm The deformed bent portion protrudes outward from the first through hole.
The battery connector according to claim 2, wherein:

The first pole piece further includes a bottom plate connected to the lower cover, wherein the first elastic arm and the plane support plate are located on the same side of the bottom plate, and the bottom plate is connected to the bottom plate through a transition part. One end of the first elastic arm and one end of the flat support plate are connected so that a predetermined distance exists between the first elastic arm, the flat support plate and the bottom plate respectively.
The battery connector according to claim 3, wherein the first elastic arm and the planar support plate are connected to the same end of the bottom plate, and the lower cover is provided with at least one second through hole, the The free end of the bottom plate extends outward from the second through hole.
The battery connector according to claim 4, wherein:

The battery connector further includes at least one connecting piece, the connecting piece includes a first flat plate connected to the inner side wall of the lower cover, a first flat plate connected to the inner side wall of the lower cover, a vertical plate extending from one side of the first flat plate and extending toward the outside of the housing. A second flat plate and a third flat plate standing perpendicular to one side of the second flat plate and parallel and opposite to the first flat plate, wherein the third flat plate is attached to the outer side wall of the lower cover.
The battery connector according to claim 1, wherein the battery connector further has a second pole piece insulated from the first pole piece, the second pole piece comprising a second elastic arm, and the second elastic force The convex direction of the deformed bent portion of the arm and the deformed bent portion of the first pole piece are the same and extend to the same plane.
A battery assembly, comprising: a battery main body, and the battery connector according to any one of claims 1 to 6 electrically connected to the output end of the battery main body.
A terminal comprising a main circuit board, a first battery connector electrically connected to the main circuit board, a second battery connector electrically connected to the battery body and the output end of the battery body, and the first battery is connected The second battery connector is the battery connector according to any one of claims 1-6, wherein the deformed bent portion of the first elastic arm of the first battery connector abuts against the For the plane support plate of the second battery connector, the deformed bent portion of the first elastic arm of the second battery connector abuts the plane support plate of the first battery connector.
A battery assembly, comprising: a battery main body, a discharge electrode sheet electrically connected to the output terminal of the battery main body, the discharge electrode sheet including a first area and a second area, the first area is a plane area, and The second area is provided with an elastic sheet, the elastic sheet includes a deformed bent portion, and the deformed bent portion protrudes outward from the plane where the discharge electrode sheet is located.
The battery assembly according to claim 9, wherein the elastic sheet further comprises:

The bottom plate is connected with the discharge electrode sheet;

The transition part connects the bottom plate and the deformed bent part.
The battery assembly according to claim 10, wherein:

The bottom plate is a flat plate structure, the transition part is an arched structure, and one end of the transition part that is not connected to the bottom plate is arranged parallel to the bottom plate, and the deformed bent part is not connected to the bottom plate from the transition part. The plane on which one end of the bottom plate is connected protrudes outward.
A terminal comprising: a main circuit board, a battery connector electrically connected to the main circuit board, a battery main body, and a discharge electrode sheet electrically connected to the output terminal of the battery main body, the battery connector is as claimed The battery connector according to any one of 1-6, the discharge electrode sheet includes a first area and a second area, the first area is a plane area, the second area is provided with an elastic sheet, and the elastic sheet includes a deformed Bent portion, the deformed bent portion protrudes outward from the plane where the discharge electrode sheet is located, wherein the deformed bent portion of the first elastic arm of the battery connector abuts against the discharge electrode sheet In the first area, the deformed bent portion of the elastic sheet of the discharge electrode sheet abuts the plane support plate of the battery connector.
The terminal according to claim 12, wherein the elastic sheet further comprises:

The bottom plate is connected with the discharge electrode sheet;

The transition part connects the bottom plate and the deformed bent part.
The terminal according to claim 13, wherein:

The bottom plate is a flat plate structure, the transition part is an arched structure, and one end of the transition part that is not connected to the bottom plate is arranged parallel to the bottom plate, and the deformed bent part is not connected to the bottom plate from the transition part. The plane on which one end of the bottom plate is connected protrudes outward.