CN212907908U

CN212907908U - Battery cell structure and electric vehicle

Info

Publication number: CN212907908U
Application number: CN202021820259.8U
Authority: CN
Inventors: 张五堂; 何金磊
Original assignee: Shanghai Lanjun New Energy Technology Co Ltd
Current assignee: Shanghai Lanjun New Energy Technology Co Ltd
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2021-04-06
Anticipated expiration: 2030-08-26

Abstract

An embodiment of the utility model provides an electricity core structure and electric vehicle relates to the power battery field. This electricity core structure includes naked electric core, electric core insulating piece, electric core gasket, utmost point post, explosion-proof valve, top cap structure and casing, the casing with top cap structure is stainless steel material, and the casing includes integrative drain pan and two side casings that set up, and two side casing intervals set up in the relative both sides of drain pan, and drain pan and two side casings enclose into the installation cavity, and the naked electric core outside is provided with electric core insulating piece, and naked electric core and electric core insulating piece are all installed in the installation cavity, and electric core gasket pad is located between naked electric core and the drain pan, and top cap structure is connected with drain pan and two side casings to the seal installation cavity, utmost point post set up in top cap structure to be connected with naked electric core electricity, explosion-proof valve sets up in top. The embodiment of the utility model provides a can reduce the assembly manufacturing degree of difficulty, promote inner space utilization.

Description

Battery cell structure and electric vehicle

Technical Field

The utility model relates to a power battery field particularly, relates to an electricity core structure and electric vehicle.

Background

For the cell structure of the existing secondary battery, the problems that the assembly of a naked cell into a shell is difficult, the space at two ends is wasted seriously, the welding yield is low and the like exist.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electricity core structure and electric vehicle, it can reduce the assembly manufacturing degree of difficulty, promotes inner space utilization.

The embodiment of the utility model is realized like this:

in a first aspect, an embodiment of the present invention provides a cell structure, which includes a bare cell, a cell insulation sheet, a cell gasket, a pole, an explosion-proof valve, a top cap structure and a casing, the shell and the top cover structure are made of stainless steel materials, the shell comprises a bottom shell and two side shells which are integrally arranged, the two side shells are arranged on two opposite sides of the bottom shell at intervals, and the bottom shell and the two side shells form an installation cavity, the outer side of the naked electric core is provided with an electric core insulation sheet, the naked electric core and the electric core insulation sheet are both arranged in the installation cavity, the electric core gasket is arranged between the naked electric core and the bottom shell, the top cover structure is connected with the bottom shell and the two side shells, and seal the installation cavity, the utmost point post set up in the top cap is structural, and with naked electric core electricity is connected, explosion-proof valve set up in the top cap is structural.

In an alternative embodiment, the side shell has opposite first and second ends, the first end being disposed on the bottom shell and the second end being welded to the top lid structure.

In an alternative embodiment, the second end portion is provided with a flange portion, a first welding opening is provided on an edge of an outer surface of the top cover structure, and the flange portion is accommodated in the first welding opening and welded to the top cover structure.

In an alternative embodiment, the end face of the flange and the side wall of the first welding opening form a laser weld seam for welding the flange and the roof structure.

In an alternative embodiment, a second welding port is disposed on an edge of an inner surface of the top cover structure, and the second end portion extends into the second welding port and is welded to the top cover structure.

In an alternative embodiment, the second weld opening has a first stop surface and a second stop surface connected to each other, the first stop surface and the second stop surface forming an angle, the first stop surface and the second end forming a laser weld for welding, and the second stop surface being configured to stop against an inner wall of the side shell.

In an optional embodiment, the second end is provided with a positioning protrusion, the bare cell and the cell insulation sheet are located below the positioning protrusion or flush with the positioning protrusion, and the top cover structure is welded to the positioning protrusion.

In an alternative embodiment, the positioning protrusion includes a first bending portion, a second bending portion, a third bending portion and a fourth bending portion connected in sequence, wherein the first bending portion is bent toward a first direction relative to the side shell, the second bending portion is bent toward a second direction opposite to the first direction relative to the first bending portion, the third bending portion is bent toward the second direction relative to the second bending portion, the fourth bending portion is bent toward the first direction relative to the third bending portion, and the third bending portion and the fourth bending portion form a welding opening welded to the top cover structure.

In an optional embodiment, the top cover structure includes a top cover body and two side cover bodies disposed at two ends of the top cover body, the top cover body and the side cover bodies are correspondingly connected to the bottom casing and the side casings, a liquid injection hole is disposed on the top cover body, the pole and the explosion-proof valve are disposed on the side cover bodies, and the pole is located below the explosion-proof valve.

In a second aspect, an embodiment of the present invention provides an electric vehicle, including the battery cell structure according to any one of the foregoing embodiments.

The embodiment of the utility model provides a beneficial effect is: the embodiment of the utility model provides an electricity core structure and electric vehicle: this electric core structure includes naked electric core, electric core insulating piece, utmost point post, explosion-proof valve, top cap structure and casing, and the drain pan and two side casings of casing enclose into the installation cavity, and drain pan and two side casings are integrative to be set up, can make the wholeness of casing higher. The shell and the top cover are made of stainless steel materials, and compared with aluminum alloy materials, the cost of the stainless steel materials is lower, so that the cost of mechanical parts is reduced; the stainless steel material has higher strength, and the wall thickness can be weakened without reducing the structural strength; meanwhile, more internal spaces can be provided for accommodating the naked electric core after the wall thickness is reduced, and the purpose of increasing the capacity of the electric core is achieved; the weight of mechanical parts can be reduced by reducing the wall thickness, and the energy density of the battery cell is improved; the laser welding performance of the stainless steel material is superior to that of the aluminum alloy material, and the stamping performance of the stainless steel material is superior to that of the aluminum alloy material, so that the manufacturing cost is reduced. The embodiment of the utility model provides a can be applied to the manufacturing of long thin type electricity core to can promote the welding goodness, reduce the assembly and make the degree of difficulty, reduce machine parts weight and account for, promote the utilization ratio of inner space.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is an explosion structure diagram of a cell structure provided in an embodiment of the present invention;

FIG. 2 is a schematic structural view of the housing of FIG. 1;

FIG. 3 is a schematic structural view of the top cover structure of FIG. 1;

FIG. 4 is a schematic view of the housing of FIG. 2 from another perspective;

FIG. 5 is an enlarged schematic view of the vicinity of A in FIG. 4;

fig. 6 is a schematic view of a connection structure of the flanging part and the top cover structure according to an embodiment of the present invention;

fig. 7 is a schematic view of a connection structure between the second end portion and the second welding port according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a positioning protrusion according to an embodiment of the present invention;

fig. 9 is a schematic view of the connection structure of the positioning protrusion and the top cover structure in fig. 8.

Icon: 100-cell structure; 110-bare cell; 120-cell insulation sheet; 130-cell gasket; 140-pole; 150-an explosion-proof valve; 160-a top cover structure; 161-a top cover body; 162-side cover body; 163-first weld port; 164-second weld interface; 1641-first stop surface; 1642-second stop face; 170-a housing; 171-a bottom shell; 172-side shell; 173-a first end portion; 174-a second end; 1741-flanging part; 1742-locating the projection; 1743-a first bend; 1744-a second bend; 1745-third bend; 1746-fourth bend; 176-positioning the convex hull; 180-a seal; 190-laser weld.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a battery cell structure 100. The cell structure 100 may be applied to a power battery, and may be applied to an electric vehicle as a part of the power battery. The electric vehicle can be a new energy automobile, engineering or industrial equipment and the like, such as an AGV and the like. The embodiment of the utility model provides an electricity core structure 100 can promote the welding goodness, reduce the assembly and make the degree of difficulty, reduce machine parts weight and account for, promote inner space utilization.

The embodiment of the utility model provides an in, this electric core structure 100 includes naked electric core 110, electric core insulating piece 120, electric core gasket 130, utmost point post 140, explosion-proof valve 150, top cap structure 160 and casing 170, casing 170 and top cap structure 160 are stainless steel material, casing 170 includes integrative drain pan 171 and two side shells 172 that set up, two side shells 172 intervals set up in the relative both sides of drain pan 171, and drain pan 171 encloses into the installation cavity with two side shells 172, naked electric core 110 outside is provided with electric core insulating piece 120, naked electric core 110 and electric core insulating piece 120 are all installed in the installation cavity, electric core gasket 130 fills up and locates between naked electric core 110 and the drain pan 171, top cap structure 160 is connected with drain pan 171 and two side shells 172, and the seal installation cavity, utmost point post 140 sets up on top cap structure 160, and be connected with naked electric core 110 electricity, explosion-proof valve 150 sets up on.

Note that, the top cover structure 160 may be provided with a liquid injection hole; optionally, the pour spout is positioned at the top and sealed by a seal 180, such as a sealing nail. The explosion-proof valve 150, the pole 140 and the like are arranged on the top cover structure 160; correspondingly, can set up the opening of assembling explosion-proof valve 150, utmost point post 140 isotructure on top cap structure 160, for example, set up the opening that supplies utmost point post 140 assembly on top cap structure 160, make utmost point post 140 and naked electric core 110 electricity be connected to make the positive and negative electrode of naked electric core 110 draw forth outside casing 170. Certainly, the pole 140 is divided into a positive connecting column and a negative connecting column, and the two connecting columns are respectively electrically connected with the positive electrode and the negative electrode of the bare cell 110 and used for leading out the positive electrode and the negative electrode of the bare cell 110. The two connection columns may be located on the same side or different sides of the cell structure 100, for example, the two connection columns are located on two opposite sides of the cell structure 100 and are located approximately opposite to each other.

In addition, the connection between the cap structure 160 and the housing 170 may be welding, including but not limited to: laser welding, electromagnetic welding, and resistance welding.

Optionally, in the embodiment of the present invention, the post 140 is located below the explosion-proof valve 150; of course, without limitation, in other embodiments of the present invention, the terminal post 140 may be located above the explosion-proof valve 150, or the terminal post 140 and the explosion-proof valve 150 may be located on different sides of the cell structure 100.

It should be noted that, the embodiment of the present invention does not specifically limit the positions of the explosion-proof valve 150, the terminal post 140 and the like on the top cover structure 160, and does not specifically limit the specific structural forms of the explosion-proof valve 150 and the terminal post 140.

In the present embodiment, the bottom case 171 and the two side cases 172 of the housing 170 form a substantially U-shape. The casing 170 and the two bottom cases 171 are substantially rectangular in shape, that is, the cell structure 100 is substantially rectangular in shape. The mounting chamber has an opening communicating with the mounting chamber on three sides of the case 170, and is closed by the bottom case 171 on the fourth side, i.e., the side of the bottom case 171. Naked electric core 110, electric core insulation board isotructure can be through the trilateral assembly of open-ended to in the installation cavity.

Referring to fig. 3, in an alternative embodiment, the top cover structure 160 may include a top cover body 161 and two side cover bodies 162 disposed at two ends of the top cover body 161, the top cover body 161 and the side cover bodies 162 are correspondingly connected to the bottom case 171 and the side cases 172, the top cover body 161 is provided with a liquid injection hole, the side cover bodies 162 are provided with the post 140 and the explosion-proof valve 150, and the post 140 is located below the explosion-proof valve 150. That is, the shape of the cap structure 160 generally matches the shape enclosed by the housing 170, thereby sealing the mounting cavity.

Optionally, in the embodiment of the present invention, the two side shells 172 have substantially identical shapes and sizes, so as to simplify the manufacturing process and reduce the manufacturing difficulty.

Alternatively, the housing 170 may be manufactured using an integral molding process, such as a bending process, or a stamping and bending process.

Alternatively, the material of the housing 170 may be a stainless steel material; the material of the top cap structure 160 may also be a stainless steel material.

Compared with aluminum alloy materials, the cost of the stainless steel material is lower, so that the cost of mechanical parts is reduced; the stainless steel material has higher strength, and the wall thickness can be weakened without reducing the structural strength; meanwhile, more internal spaces can be provided to accommodate the bare cell 110 after the wall thickness is reduced, so that the purpose of increasing the capacity of the cell is achieved; the weight of mechanical parts can be reduced by reducing the wall thickness, and the energy density of the battery cell is improved; the laser welding performance of the stainless steel material is superior to that of the aluminum alloy material, and the stamping performance of the stainless steel material is superior to that of the aluminum alloy material, so that the manufacturing cost is reduced. The embodiment of the utility model provides a can be applied to the manufacturing of long thin type electricity core to can promote the welding goodness, reduce the assembly and make the degree of difficulty, reduce machine parts weight and account for, promote the utilization ratio of inner space.

Referring to fig. 4, in an alternative embodiment, the side casing 172 has a first end 173 and a second end 174 opposite to each other, the first end 173 is disposed on the bottom casing 171, and the second end 174 is welded to the top cover structure 160. Alternatively, the first end 173 is integrally formed with the bottom case 171, for example, by bending, stamping, etc. to form the bottom case 171 and the side cases 172 of the housing 170.

Referring to fig. 5 and 6, in an alternative embodiment, the second end 174 is provided with a flanging portion 1741, the edge of the outer surface of the top cover structure 160 is provided with a first welding port 163, and the flanging portion 1741 is received in the first welding port 163 and is welded to the top cover structure 160. By providing the burring portion 1741 at the second end portion 174, the burring portion 1741 can be more easily fitted to the first welding port 163 at the time of assembly welding, thereby facilitating welding.

Optionally, the end face of the flanging portion 1741 forms a laser weld 190 with the side wall of the first welding opening 163, the laser weld 190 being used to weld the flanging portion 1741 and the roof structure 160. During welding, the laser welding 190 welds the flanged portion 1741 to the top cover structure 160.

Referring to fig. 7, in an alternative embodiment, the edge of the inner surface of the top cover structure 160 is provided with a second welding opening 164, and the second end 174 extends into the second welding opening 164 and is welded to the top cover structure 160.

Optionally, the second welding port 164 has a first stop surface 1641 and a second stop surface 1642 connected to each other, the first stop surface 1641 and the second stop surface 1642 form an included angle, the first stop surface 1641 and the second end 174 form a laser welding seam 190 for welding, and the second stop surface 1642 is used for stopping the inner wall of the side shell 172.

The first stop surface 1641 and the second stop surface 1642 can achieve quick positioning of the top cover structure 160 and the second end portion 174, thereby improving welding efficiency.

Referring to fig. 8 and 9, in an alternative embodiment, the second end 174 is provided with a positioning protrusion 1742, the bare cell 110 and the cell insulation sheet 120 are located below the positioning protrusion 1742 or are flush with the positioning protrusion 1742, and the top cover structure 160 is welded to the positioning protrusion 1742.

Further, the positioning protrusion 1742 includes a first bending portion 1743, a second bending portion 1744, a third bending portion 1745, and a fourth bending portion 1746 sequentially connected to each other, wherein the side shell 172 opposite to the first bending portion 1743 is bent toward the first direction, the second bending portion 1744 is bent toward the second direction opposite to the first direction, the third bending portion 1745 is bent toward the second direction opposite to the second bending portion 1744, the fourth bending portion 1746 is bent toward the first direction opposite to the third bending portion 1745, and the third bending portion 1745 and the fourth bending portion 1746 form a welding opening welded to the top cover structure 160.

This location bulge 1742 forms first kink 1743, second kink 1744, third kink 1745 and fourth kink 1746 through the bending process, can be convenient for with the assembly of top cap structure 160, promotes locating efficiency between them to it is more efficient to make the assembly.

It should be appreciated that, as shown, three options are possible to facilitate welding of the housing 170 to the cap structure 160.

In addition, a positioning boss 176 may be provided on the side casing 172, the positioning boss 176 being adjacent to an edge of the side casing 172 for positioning during assembly.

The embodiment of the utility model provides an electric vehicle including as in any one of the aforesaid embodiment's electric core structure 100, this electric vehicle's power battery can adopt foretell electric core structure 100.

Referring to fig. 1 to fig. 6, an electrical core structure 100 and an electric vehicle according to an embodiment of the present invention: this electricity core structure 100 includes naked electric core 110, electric core insulating piece 120, utmost point post 140, explosion-proof valve 150, capping structure 160 and casing 170, and the drain pan 171 and two side casings 172 of casing 170 enclose into the installation cavity, and drain pan 171 and two side casings 172 are integrative to be set up, can make casing 170's an organic whole nature higher. The shell 170 and the top cover structure 160 are made of stainless steel materials, and compared with aluminum alloy materials, the cost of the stainless steel materials is lower, so that the cost of mechanical parts is reduced; the stainless steel material has higher strength, and the wall thickness can be weakened without reducing the structural strength; meanwhile, more internal spaces can be provided to accommodate the bare cell 110 after the wall thickness is reduced, so that the purpose of increasing the capacity of the cell is achieved; the weight of mechanical parts can be reduced by reducing the wall thickness, and the energy density of the battery cell is improved; the laser welding performance of the stainless steel material is superior to that of the aluminum alloy material, and the stamping performance of the stainless steel material is superior to that of the aluminum alloy material, so that the manufacturing cost is reduced. The embodiment of the utility model provides a can be applied to the manufacturing of long thin type electricity core to can promote the welding goodness, reduce the assembly and make the degree of difficulty, reduce machine parts weight and account for, promote the utilization ratio of inner space.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The cell structure is characterized by comprising a bare cell (110), a cell insulation sheet (120), a cell gasket (130), a pole column (140), an explosion-proof valve (150), a top cover structure (160) and a shell (170), wherein the shell (170) and the top cover structure (160) are made of stainless steel materials, the shell (170) comprises a bottom shell (171) and two side shells (172) which are integrally arranged, the two side shells (172) are arranged on two opposite sides of the bottom shell (171) at intervals, the bottom shell (171) and the two side shells (172) enclose an installation cavity, the cell insulation sheet (120) is arranged on the outer side of the bare cell (110), the bare cell (110) and the cell insulation sheet (120) are both installed in the installation cavity, and the cell gasket (130) is arranged between the bare cell (110) and the bottom shell (171), the top cover structure (160) is connected with the bottom shell (171) and the two side shells (172) and seals the mounting chamber, the pole column (140) is arranged on the top cover structure (160) and is electrically connected with the bare cell (110), and the explosion-proof valve (150) is arranged on the top cover structure (160).

2. The cell structure of claim 1, wherein the side casing (172) has opposite first and second ends (173, 174), the first end (173) being disposed on the bottom case (171), the second end (174) being welded to the top cover structure (160).

3. The cell structure of claim 2, wherein the second end portion (174) is provided with a flanging portion (1741), and wherein a first welding opening (163) is provided on an outer surface edge of the top cover structure (160), and wherein the flanging portion (1741) is received in the first welding opening (163) and is welded to the top cover structure (160).

4. The cell structure of claim 3, wherein an end face of the flanging portion (1741) forms a laser weld seam (190) with a side wall of the first weld opening (163), the laser weld seam (190) being used for welding the flanging portion (1741) and the top cover structure (160).

5. The cell structure of claim 2, wherein a second welding opening (164) is provided on an edge of an inner surface of the cap structure (160), and the second end portion (174) extends into the second welding opening (164) and is welded to the cap structure (160).

6. The cell structure of claim 5, wherein the second weld opening (164) has a first stop surface (1641) and a second stop surface (1642) connected to each other, the first stop surface (1641) and the second stop surface (1642) forming an angle, the first stop surface (1641) forming a laser weld (190) with the second end (174) for welding, the second stop surface (1642) being configured to stop against an inner wall of the side casing (172).

7. The cell structure of claim 2, wherein the second end (174) is provided with a positioning protrusion (1742), the bare cell (110) and the cell insulation sheet (120) are located below the positioning protrusion (1742) or flush with the positioning protrusion (1742), and the top cover structure (160) is welded with the positioning protrusion (1742).

8. The cell structure according to claim 7, wherein the positioning protrusion (1742) comprises a first bending portion (1743), a second bending portion (1744), a third bending portion (1745), and a fourth bending portion (1746) connected in sequence, wherein the first bending portion (1743) is bent in a first direction with respect to the side shell (172), the second bending portion (1744) is bent in a second direction opposite to the first direction with respect to the first bending portion, the third bending portion (1745) is bent in the second direction with respect to the second bending portion (1744), the fourth bending portion (1746) is bent in the first direction with respect to the third bending portion (1745), and the third bending portion (1745) and the fourth bending portion (1746) form a welding port welded to the top cover structure (160).

9. The cell structure of any one of claims 1 to 8, wherein the top cover structure (160) comprises a top cover body (161) and two side cover bodies (162) arranged at two ends of the top cover body (161), the top cover body (161) and the side cover bodies (162) are correspondingly connected with the bottom case (171) and the side cases (172), a liquid injection hole is arranged on the top cover body (161), the pole post (140) and the explosion-proof valve (150) are arranged on the side cover bodies (162), and the pole post (140) is located below the explosion-proof valve (150).

10. An electric vehicle, characterized in that it comprises a cell structure (100) according to any of claims 1 to 9.