CN219497946U

CN219497946U - Top cover assembly, battery cell, battery and electricity utilization device

Info

Publication number: CN219497946U
Application number: CN202320185844.2U
Authority: CN
Inventors: 张方超; 余鹏; 李磊; 徐晓东
Original assignee: Shanghai Lanjun New Energy Technology Co Ltd
Current assignee: Shanghai Lanjun New Energy Technology Co Ltd
Priority date: 2023-02-08
Filing date: 2023-02-08
Publication date: 2023-08-08
Anticipated expiration: 2033-02-08

Abstract

The utility model relates to a top cover assembly, which comprises a cover plate and a pole assembly, wherein a boss is formed at the edge of a mounting hole on the cover plate and protrudes from the front surface of the cover plate along the axial direction of the mounting hole; the pole assembly comprises a pole and a first insulating plate, the pole penetrates through the mounting hole, the first insulating plate is sleeved on the pole and arranged on the front face of the cover plate, a clamping groove is formed in the surface, facing the cover plate, of the first insulating plate, and the boss is clamped in the clamping groove. After the pole assembly is assembled with the cover plate, the first insulating plate can be well limited on the cover plate through the matching of the boss and the clamping groove, so that the first insulating plate is not easy to rotate along with the pole, and limit can be realized on the pole. Moreover, the arrangement of the boss can enable the part of the cover plate to be thickened, and the strength of the edge of the mounting hole can be increased, so that the deformation resistance of the cover plate can be improved. Therefore, the above-described top cap assembly can improve the reliability of the battery. In addition, the utility model also provides a battery monomer, a battery and an electric device.

Description

Top cover assembly, battery cell, battery and electricity utilization device

Technical Field

The utility model relates to the technical field of new energy, in particular to a top cover assembly, a battery cell, a battery and an electric device.

Background

Secondary batteries generally include a case, a battery cell assembly, and a top cap assembly, the battery cell assembly being received in the case and sealed by the top cap assembly. The top cover assembly is provided with a pole, and the pole penetrates through the cover plate of the top cover assembly and is welded with the pole lug of the battery core assembly, so that the pole is used as a terminal of a battery.

After the pole is assembled in the mounting hole formed in advance in the cover plate, upper plastic is generally formed around the pole in an injection molding mode, and the upper plastic can play a sealing role between the pole and the mounting hole. Because the pole and the mounting hole are round, the pole is easy to rotate after being mounted. The rotation of the pole can drive the upper plastic to rotate, so that the sealing between the pole and the mounting hole is invalid, and the reliability of the secondary battery is further affected.

Disclosure of Invention

In view of the above, it is desirable to provide a top cap assembly that can improve the reliability of the battery.

A header assembly, comprising:

the cover plate is provided with a mounting hole, a boss is formed at the edge of the mounting hole, and the boss protrudes out of the front surface of the cover plate along the axial direction of the mounting hole; and

The pole assembly comprises a pole and a first insulating plate, the pole penetrates through the mounting hole, the first insulating plate is sleeved on the pole and arranged on the front face of the cover plate, the first insulating plate faces the surface of the cover plate to form a clamping groove, and the boss is clamped in the clamping groove.

In one embodiment, a plurality of bosses are provided, and a plurality of bosses are provided at intervals along the circumferential direction of the mounting hole.

In one embodiment, each boss extends along an arc line, the mounting hole is circular, and a plurality of bosses are arranged concentrically with the mounting hole.

In one embodiment, the pole comprises a main body, a base and a compression ring, wherein the base and the compression ring are arranged at intervals along the axial direction of the main body, the main body penetrates through the mounting hole and enables the base to be abutted to the back surface of the cover plate, and the compression ring is used for compressing the first insulating plate on the front surface of the cover plate.

In one embodiment, the pole assembly further comprises a sealing ring sleeved on the main body and clamped between the base and the back surface of the cover plate.

In one embodiment, the cover plate further comprises a second insulating plate, and the second insulating plate is arranged on the back surface of the cover plate.

In one embodiment, the cover plate is provided with two mounting holes, and the pole assemblies are provided with two mounting holes, and the two pole assemblies are respectively mounted in the two mounting holes.

Above-mentioned top cap subassembly, post subassembly and apron assembly back can be located the apron with first insulation board better through the cooperation of boss and draw-in groove to make first insulation board be difficult for rotating along with the post, and can realize spacing to the post. Moreover, the arrangement of the boss can enable the part of the cover plate to be thickened, and the strength of the edge of the mounting hole can be increased, so that the deformation resistance of the cover plate can be improved. Therefore, the above-described top cap assembly can improve the reliability of the battery.

In addition, the utility model also provides a battery monomer, a battery and an electric device.

A battery cell comprising:

a housing having an opening formed at least one side;

the battery cell assembly is accommodated in the shell; and

The cap assembly of any one of the above preferred embodiments, wherein the cap assembly seals an opening provided to the housing.

A battery comprising a plurality of cells as described in the preferred embodiments above.

An electrical device comprising a battery cell as described in the above preferred embodiments or a battery as described in the above preferred embodiments.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a battery cell according to a preferred embodiment of the present utility model;

fig. 2 is a top view of the cap assembly in the battery cell of fig. 1;

FIG. 3 is a cross-sectional view of the cap assembly shown in FIG. 2 taken along line A-A;

FIG. 4 is an enlarged schematic view of a portion B of the cross-sectional view of the header assembly of FIG. 3;

fig. 5 is an isometric view of a cover plate in the header assembly of fig. 2.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

The utility model discloses an electric device, a battery and a battery cell. The electric device can be a vehicle, a mobile phone, portable equipment, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, energy storage equipment, recreation equipment, an elevator, lifting equipment and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, or an electric plane toy, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and the like; the energy storage device can be an energy storage wall, a base station energy storage, a container energy storage and the like; the amusement device may be a carousel, a stair jump machine, or the like. The present application does not particularly limit the above-described power consumption device.

For pure electric vehicles, the battery can be used as a driving power supply, so that the battery can replace fossil fuel to provide driving power.

The battery may be a battery pack or a battery module. When the battery is a battery pack, the battery pack specifically includes a Battery Management System (BMS) and a plurality of the battery cells. The battery management system is used for controlling and monitoring the working states of the battery monomers. In addition, a plurality of battery cells can be connected in series and/or in parallel and form a battery module together with a module management system, and then the battery modules are electrically connected in series, in parallel or in a mode of mixing the series and the parallel and form a battery pack together with the battery management system.

The battery pack or the battery module can be arranged on a supporting structure such as a box body, a frame and a bracket, and the battery cells can be electrically connected through a confluence part. The battery cell may be a lithium ion battery, a sodium ion battery or a magnesium ion battery, and its external contour may be a cylinder, a flat body, a cuboid or other shapes, but is not limited thereto. In this embodiment, the battery cell is a lithium ion prismatic battery.

Referring to fig. 1, a battery cell 10 according to a preferred embodiment of the present utility model includes a housing 100, a cell assembly 200, and a cap assembly 300.

The case 100 has a hollow structure having an accommodating space therein for accommodating the battery cell assembly 200, the electrolyte, and other components. At least one end of the housing 100 is formed with an opening (not shown) through which the cell assembly 200 can be fitted into the housing 100. Since the case 100 in the present embodiment is applied to a square battery, the external contour of the case 100 has a rectangular parallelepiped shape.

The battery cell assembly 200 is a core member of the battery cell 10, and is housed in the case 100. To adapt to the shape of the housing 100, the cell assembly 200 in this embodiment has a rectangular parallelepiped shape. The battery cell assembly 200 generally includes a bare cell 210 and an insulating sheet 220, where the insulating sheet 220 can protect the bare cell 210 and perform a better insulating function between the bare cell 210 and the inner wall of the housing 100. Specifically, the material of the insulating sheet 220 may be polyimide, polyethylene, polyvinylidene fluoride, or the like. Each of the battery cell assemblies 200 may include one or more bare battery cells 210, each of the bare battery cells 210 may be formed of a positive electrode sheet, a negative electrode sheet, and a separator having an insulating function between the negative electrode sheet and the positive electrode sheet by winding or lamination, and the bare battery cells 210 formed by winding may be pressed into a flat shape.

The bare cell 210 has a positive tab (not shown) and a negative tab (not shown), which are led out from the positive and negative tabs of the bare cell 210, respectively, and the insulating sheet 220 is coated on the outer periphery of the bare cell 210 and exposes the tab. The positive electrode tab and the negative electrode tab may be located at the same end of the battery cell assembly 200, or may be located at opposite ends of the battery cell assembly 200.

The cap assembly 300 is hermetically disposed at the opening of the case 100 to form a relatively closed environment inside the case 100, thereby isolating the cell assembly 200 from the external environment. The shape of the top cover assembly 300 is adapted to the shape of the opening of the housing 100, and in particular, in the present embodiment, the top cover assembly 300 is substantially rectangular.

Referring to fig. 2 and 3, the top cap assembly 300 includes a cap plate 310 and a pole assembly 330. Wherein:

the cover plate 310 may be formed of a material having high mechanical strength, such as aluminum, aluminum alloy, or stainless steel. The cover 310 has a back surface and a front surface, wherein the back surface refers to a surface of the cover 310 facing the interior of the housing 100, i.e. a lower surface shown in fig. 1; the front side of the cover 310 is referred to as the upper surface shown in fig. 1.

In particular, in the present embodiment, the top cover assembly 300 further includes a second insulating plate 320, and the second insulating plate 320 is disposed on the back surface of the cap plate 310. The second insulating plate 320 can abut against the cell assembly 200 in the housing 100, thereby playing a role in limiting and buffering the cell assembly 200. The second insulating plate 320 and the cover plate 310 have substantially the same shape and are rectangular, and may be formed of an insulating material such as plastic or rubber. The cover plate 310 and the second insulating plate 320 are generally connected by means of clamping, bonding, or the like. Typically, the cap plate 310 and the second insulating plate 320 are integrally formed by injection molding.

The cover plate 310 is generally provided with a pouring hole 302 penetrating in the thickness direction. Correspondingly, through holes (not shown) are also formed in the second insulating plate 320 at positions corresponding to the liquid injection holes 302, and the liquid injection holes 302 are generally circular holes. After the cap assembly 300 seals the opening of the case 100, an electrolyte may be injected into the inside of the case 100 through the injection hole 302. After the injection is completed, the injection hole 302 is also typically plugged by laser welding.

In addition, the cover plate 310 in this embodiment is provided with an explosion-proof hole 303 (see fig. 5) penetrating in the thickness direction, and the top cover assembly 300 further includes an explosion-proof valve 340, where the explosion-proof valve 340 is hermetically disposed in the explosion-proof hole 303. When the gas pressure in the housing 100 exceeds the threshold value, the explosion-proof valve 340 is opened to release the pressure in the housing 100, thereby preventing the explosion of the battery cell 10.

It should be appreciated that in other embodiments, the explosion proof hole 303 on the cover plate 310 may be omitted and the explosion proof valve 340 may be mounted on the bottom wall or the side wall of the housing 100.

Referring to fig. 4 and 5, the cover 310 is provided with a mounting hole 301, and the mounting hole 301 can be used for mounting the pole assembly 300. The second insulating plate 320 is also provided with corresponding clearance holes at positions corresponding to the mounting holes 301. Further, the edge of the mounting hole 301 is formed with a boss 311, and the boss 311 protrudes from the front surface of the cover plate 310 in the axial direction of the mounting hole 301.

The boss 311 is not a continuous annular structure, and may be in a block shape, a columnar shape, or the like, and may be provided in plural or in one. The boss 311 can thicken a portion of the cover plate 310, and the boss 311 can serve as a reinforcing rib to increase the strength of the edge of the mounting hole 301, so that the deformation resistance of the cover plate 310 can be improved.

The pole assembly 330 includes a pole 331 and a first insulating plate 332. The pole 331 is disposed through the mounting hole 301, the first insulating plate 332 is sleeved on the pole 331 and disposed on the front surface of the cover plate 310, a clamping groove (not shown) is formed on the surface of the first insulating plate 332 facing the cover plate 310, and the boss 311 is clamped in the clamping groove. In the present embodiment, the mounting hole 301 is circular, and the main body of the pole 331 is cylindrical, so that the direction of the pole 331 is not needed to be distinguished during assembly, which is beneficial to improving efficiency.

The post assembly 330 is typically installed by staking. In the present embodiment, the pole 331 includes a main body 3311, a base 3312 and a clamp ring 3313 arranged along the axial direction of the main body 3311 at intervals, the main body 3311 is inserted into the mounting hole 301 and makes the base 3312 contact with the back surface of the cover plate 310, and the clamp ring 3313 presses the first insulating plate 332 against the front surface of the cover plate 310.

The body 3311 is generally cylindrical with the base 3312 and compression ring 3313 extending circumferentially of the body 3311 and the radial dimensions of the base 3312 and compression ring 3313 being greater than the radial dimensions of the body 3311. The base 3312 may be rectangular or circular, the compression ring 3313 may be generally annular, and the body 3311, base 3312 and compression ring 3313 may be generally integrally formed. When the pole assembly 330 is assembled, the pole 331 sequentially passes through the second insulating plate 320 and the cover plate 310 from bottom to top until the base 3312 abuts against the back surface of the cover plate 310, specifically the second insulating plate 320; then, a first insulating plate 332 is injection molded at the cover plate 310 and the main body 3311, and the first insulating plate 332 is filled in the gap between the main body 3311 and the mounting hole 301 and is arranged on the front surface of the cover plate 310; finally, the end of the pole 331 away from the base 3312 is swaged to deform the body 3311 and to obtain a clamp ring 3313.

After the pole assembly 330 is assembled with the cover plate 310, the first insulating plate 332 can be sealed between the pole 331 and the mounting hole 301, and the first insulating plate 332 can be well limited to the cover plate 310 through the matching of the boss 311 and the clamping groove, so that the first insulating plate 332 is not easy to rotate along with the pole 331, and limiting can be achieved on the pole 331. In this way, the seal failure between the pole 331 and the mounting hole 301 can be effectively prevented.

In the present embodiment, the pole assembly 330 further includes a sealing ring 333, and the sealing ring 333 is sleeved on the main body 3311 and clamped between the base 3312 and the back surface of the cover plate 310. When the pole assembly 330 is assembled, the sealing ring 333 is first sleeved on the main body 3311. As the body 3311 penetrates into the mounting hole 301, the base 3312 may compress the sealing ring 333 against the back surface of the cover plate 310. The seal ring 333 can realize sealing between the pole 331 and the mounting hole 301 from inside to outside, thereby further improving the sealing performance between the pole 331 and the mounting hole 301.

In the present embodiment, a plurality of bosses 311 are provided, and a plurality of bosses 311 are provided at intervals along the circumferential direction of the mounting hole 301. Correspondingly, a plurality of clamping grooves are formed in corresponding positions on the surface of the first insulating plate 332. The plurality of clamping grooves are matched with the plurality of bosses 311, so that the limiting effect on the first insulating plate 332 is better.

Further, in the present embodiment, each boss 311 extends along an arc line, and a plurality of bosses 311 are disposed concentrically with the mounting hole 301. Each boss 311 is arc-shaped, and each boss 311 comprises an inner arc-shaped edge and an outer arc-shaped edge. The inner arc edges of the plurality of bosses 311 are all located on the first concentric circle, the outer arc edges are all located on the second concentric circle, and the first concentric circle, the second concentric circle and the mounting hole 301 are concentrically arranged.

Therefore, the extending directions of the bosses 311 are consistent with the extending directions of the edges of the mounting holes 301, so that the reinforcing effect of the plurality of circular arc-shaped bosses 311 on the edges of the mounting holes 301 is better.

After the top cap assembly 300 seals the case 100, the base 3312 of the post 331 is welded to the positive tab or the negative tab. In particular, in the present embodiment, the positive tab and the negative tab are located on the same side of the cell assembly 200. Therefore, only one side of the case 100 is opened, and only one cap assembly 300 is provided, so that the cap assembly 300 is provided with two pole assemblies 330.

Specifically, two pole assemblies 330 may be distributed at both ends of the top cap assembly 300 in the length direction. The cover plate 310 is provided with two mounting holes 301, and two pole assemblies 330 are respectively mounted in the two mounting holes 301. The poles 331 of the two pole assemblies 330 are connected to the positive electrode tab and the negative electrode tab, respectively, so as to serve as the positive electrode terminal and the negative electrode terminal of the battery cell 10, respectively.

Above-mentioned battery cell 10 and top cap subassembly 300, post subassembly 330 and apron 310 assembly back can be with first insulating plate 332 limit well in apron 310 through the cooperation of boss 311 and draw-in groove to make first insulating plate 332 be difficult for rotating along with post 331, and can realize spacing to post 331. Moreover, the provision of the boss 311 can thicken a part of the cover plate 310 and can increase the strength of the edge of the mounting hole 301, so that the deformation resistance of the cover plate 310 can also be improved. Accordingly, the cap assembly 300 described above can improve the reliability of the battery cell 10.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. A header assembly, comprising:

2. The header assembly of claim 1, wherein a plurality of said bosses are provided, a plurality of said bosses being spaced circumferentially about said mounting aperture.

3. The header assembly of claim 2, wherein each boss extends along a circular arc, the mounting hole is circular, and a plurality of the bosses are disposed concentric with the mounting hole.

4. The top cap assembly of claim 1, wherein the pole includes a main body, a base and a clamp ring disposed at intervals along an axial direction of the main body, the main body is disposed through the mounting hole and abuts the base against a back surface of the cover plate, and the clamp ring presses the first insulating plate against a front surface of the cover plate.

5. The top cap assembly of claim 4, wherein the post assembly further comprises a sealing ring that is sleeved on the body and clamped between the base and the back of the cover plate.

6. The header assembly of claim 1, further comprising a second insulating plate disposed on a back surface of the cap plate.

7. The top cover assembly according to any one of claims 1 to 6, wherein two of the mounting holes are provided in the cover plate, two of the pole assemblies are provided, and two of the pole assemblies are respectively mounted in the two mounting holes.

8. A battery cell, comprising:

a housing having an opening formed at least one side;

the battery cell assembly is accommodated in the shell; and

The cap assembly according to any one of claims 1 to 7, wherein the cap assembly seals an opening provided in the housing.

9. A battery comprising a plurality of cells according to claim 8.

10. An electrical device comprising a battery cell as claimed in claim 8 or a battery as claimed in claim 9.