CN219497947U

CN219497947U - Top cover assembly, battery cell, battery and electricity utilization device

Info

Publication number: CN219497947U
Application number: CN202320188119.0U
Authority: CN
Inventors: 赵艺惠; 何金磊; 张方超; 余鹏
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, a first insulating plate and a pole assembly. After the pole assembly is assembled with the cover plate, the first insulating plate can be well limited on the cover plate through the fit of the noncircular protruding structure and the groove structure, so that the first insulating plate is not easy to displace relative to the cover plate. Moreover, there is frictional force between the base of utmost point post and the first insulating plate, so the utmost point post also is difficult for removing for the first insulating plate, so also can play better spacing effect to the utmost point post to prevent effectively that the utmost point post from rotating, and then avoid leading to the sealed inefficacy between utmost point post and the apron because of the utmost point post rotates. Therefore, the above-described top cap assembly can improve the reliability of the battery. In addition, the utility model also provides a battery cell, 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.

The pole is assembled in the mounting hole of the cover plate in advance in a press riveting mode, and the pole and the mounting hole are round, so that the pole is easy to rotate after being mounted. The rotation of the pole may cause a failure in the seal between the pole and the mounting hole, thereby resulting in an inability to ensure the air tightness of the assembled housing and further affecting the reliability of the secondary battery.

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;

the first insulating plate is arranged on the back surface of the cover plate; a kind of electronic device with high-pressure air-conditioning system

The pole assembly comprises a pole, the pole comprises a main body and a base positioned at one end of the main body, and the main body penetrates through the mounting hole and enables the base to be abutted with the first insulating plate;

the back of the cover plate is provided with one of a noncircular protruding structure and a noncircular groove structure, the surface of the first insulating plate, which faces the cover plate, is provided with the protruding structure and the other one of the groove structures, the protruding structure or the groove structures are arranged along the circumference of the mounting hole, and the protruding structure is clamped in the groove structures.

In one embodiment, the projection arrangement is provided as an annular boss surrounding the mounting hole, and the recess arrangement is provided as an annular recess matching the annular boss.

In one embodiment, the height of the raised structures relative to the back of the cover plate is 0.1mm to 1mm.

In one embodiment, the protruding structure is disposed on the cover plate, the base is located in a non-circular area surrounded by the protruding structure, and a side contour of the base is configured to match a shape of the non-circular area.

In one embodiment, the non-circular region is countersunk relative to the back of the cover plate to form a non-circular lower counterbore within which the base is received.

In one embodiment, a gap is formed between the sidewall of the base and the sidewall of the lower counterbore, and the first insulating plate extends into the gap.

In one embodiment, the pole assembly further comprises a second insulating plate, the pole further comprises a compression ring which is arranged with the base along the axial direction of the main body at intervals, and the second insulating plate is sleeved on the main body and is compressed on the front face of the cover plate by the compression ring.

Above-mentioned top cap subassembly, post subassembly and apron assembly back, through noncircular protruding structure and groove structure cooperation, can be with the better limit of first insulation board in the apron to make the difficult displacement that takes place for the apron of first insulation board. Moreover, there is frictional force between the base of utmost point post and the first insulating plate, so the utmost point post also is difficult for removing for the first insulating plate, so also can play better spacing effect to the utmost point post to prevent effectively that the utmost point post from rotating, and then avoid leading to the sealed inefficacy between utmost point post and the apron because of the utmost point post rotates. 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; a kind of electronic device with high-pressure air-conditioning system

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 a bottom view of the cover plate of the header assembly of FIG. 2;

fig. 6 is a cross-sectional view of the cover plate of fig. 5 taken along C-C.

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, a first insulating plate 320 and a post assembly 330.

The cover plate 310 may be formed of a material having high mechanical strength, such as aluminum, aluminum alloy, or stainless steel, and the first insulating plate 320 may be formed of an insulating material such as plastic, rubber, or the like. The first insulating plate 320 is disposed at the back surface of the cap plate 310. Wherein the back surface refers to the surface of the cover plate 310 facing the inside of the case 100, i.e., the lower surface shown in fig. 3; the front side of the cover plate 310 refers to the opposite side, i.e., the upper surface shown in fig. 3. The cover plate 310 and the first insulating plate 320 are substantially identical in shape and each have a rectangular shape. The cover plate 310 and the first insulating plate 320 are generally connected by clamping, bonding, or the like. In addition, the first insulating plate 320 may be molded by injection molding.

The cover plate 310 is generally provided with a liquid injection hole 313 penetrating in the thickness direction. Correspondingly, through holes (not shown) are also formed in the first insulating plate 320 at positions corresponding to the liquid injection holes 313, and the liquid injection holes 313 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 313. After the injection is completed, the injection hole 313 is also typically plugged by laser welding.

In addition, the cover plate 310 in this embodiment is provided with an explosion-proof hole 314 (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 314. 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 314 in the cover plate 310 may be omitted and the explosion proof valve 340 may be mounted on the bottom wall or 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 first insulating plate 320 is also provided with corresponding clearance holes at positions corresponding to the mounting holes 301. Further, the back surface of the cap plate 310 is provided with one of a non-circular protrusion structure 311 and a non-circular groove structure 321, and the surface of the first insulating plate 320 facing the cap plate 310 is provided with the other one of the protrusion structure 311 and the groove structure 322. The protruding structure 311 or the groove structure 321 is disposed along the circumferential direction of the mounting hole 301, and the protruding structure 311 is clamped in the groove structure 321.

In particular, in the present embodiment, the back surface of the cover plate 310 is provided with a non-circular protrusion structure 311, and the surface of the first insulating plate 320 facing the cover plate 310 is formed with a non-circular groove structure 321. The protruding structure 311 is not easily worn on the cover plate 310, and can play a role of a reinforcing rib, thereby increasing the mechanical strength of the cover plate 310.

The pole assembly 330 includes a pole 331, wherein the pole 331 includes a body 3311 and a base 3312 at one end of the body 3311. The body 3311 is generally cylindrical with the base 3312 extending circumferentially of the body 3311 and the radial dimension of the base 3312 being greater than the radial dimension of the body 3311. The body 3311 is inserted into the mounting hole 301 and the chassis 3312 is brought into contact with the first insulating plate 320.

After the post assembly 330 is assembled with the cap plate 310, the non-circular protrusion structure 311 interacts with the recess structure 321 to prevent the first insulating plate 320 from being displaced relative to the cap plate 310. Further, since there is a friction force between the base 3312 and the first insulating plate 320, the pole 331 is also not easily moved relative to the first insulating plate 320. Therefore, the post 331 after the assembly is not easily rotated, thereby avoiding failure of the seal between the post 331 and the cap plate 310 due to rotation of the post 331.

In this embodiment, the pole assembly 330 further includes a second insulating plate 332, and the pole 331 further includes a clamp ring 3313 spaced apart from the base 3312 along the axial direction of the body 3311. Similarly, the compression ring 3313 also extends circumferentially of the body 3311 and has a radial dimension greater than the radial dimension of the body 3311. The body 3311, base 3312, and compression ring 3313 are typically integrally formed.

Further, the second insulating plate 332 is sleeved on the main body 3311 and is pressed against the front surface of the cover plate 310 by the pressing ring 3313. The second insulating plate 332 can serve as an insulation and seal between the post 331 and the cap plate 310. The second insulating plate 332 is made of the same material as the first insulating plate 320, and may be injection molded during the assembly process.

The pole assembly 330 is assembled as follows: the pole 331 sequentially passes through the first insulating plate 320 and the cover plate 310 from bottom to top until the base 3312 abuts against the first insulating plate 320; then, the second insulating plate 332 is injection molded at the cover plate 310 and the main body 3311; 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.

In this embodiment, the pole 331 assembly 330 further includes a support ring 333, the support ring 333 is sleeved on the main body 3311 and is attached to the second insulating plate 332, and the compression ring 3313 presses the second insulating plate 332 against the front surface of the cover plate 310 through the support ring 333. The support ring 333 is typically a metal ring, which can increase the contact area between the compression ring 3313 and the second insulating plate 332, so that the compression ring 3313 can better fix the second insulating plate 332, and improve the stability of the installation of the pole assembly 330.

The base 3312 of the post 331 is welded to the positive or 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. At this time, the case 100 is opened only at one side, so that only one cap assembly 300 needs to be provided. The top cover assembly 300 is provided with two pole assemblies 330, the two pole assemblies 330 can be distributed at two ends of the top cover assembly 300 in the length direction, and the poles 331 of the two pole assemblies 330 are respectively connected with the positive pole lug and the negative pole lug, so that the two pole lugs are respectively used as the positive pole terminal and the negative pole terminal of the battery cell 10.

In the present embodiment, the projection structure 311 is provided as an annular boss surrounding the mounting hole 301, and the groove structure 321 is provided as an annular groove matching the annular boss. The annular boss and the annular groove are continuous structures, and the limit effect is better when the annular boss and the annular groove are matched.

It should be noted that in other embodiments, the raised structures 311 may also be intermittent structures. For example, the projection structure 311 includes a plurality of columnar projections or plate-like projections, which are disposed at intervals along the circumferential direction of the mounting hole 301.

In the present embodiment, the height of the protruding structures 311 with respect to the back surface of the cover plate 310 is 0.1mm to 1mm. When the height of the protruding structure 311 is smaller than 0.1mm, the protruding structure 311 and the groove structure 321 cooperate to limit the first insulating plate 320 relatively poorly, and the first insulating plate 320 still moves relative to the cover plate 310 under the action of torsion; when the height of the protruding structure 311 is greater than 1mm, the thickness of the first insulating plate 320 is increased correspondingly, so that a larger space in the housing 100 is occupied, and the energy density of the battery cell 10 is reduced. The height of the protruding structures 311 is set to be 0.1mm to 1mm, so that the requirements of reliability and energy density improvement can be well met.

Preferably, the height of the protrusion structure 311 with respect to the back surface of the cover plate 310 is set to 0.1mm to 0.5mm.

Referring to fig. 6, in the present embodiment, the base 3312 is located in a non-circular area (not shown) surrounded by the bump structure 311, and the side profile of the base 3312 is configured to match the shape of the non-circular area. That is, the side profile of the base 3312 is also configured to be non-circular such that the base 3312 cannot rotate within the non-circular region. In this way, the protruding structure 311 can also directly limit the pole 331, thereby further preventing the pole 331 from rotating.

Further, in the present embodiment, the non-circular area surrounded by the protruding structure 311 is sunk relative to the back surface of the cover plate 310, so as to form a non-circular lower counterbore 312, and the base 3312 is accommodated in the lower counterbore 312. The base 3312 is matched with the lower counter bore 312, and the limiting effect on the pole 331 is further improved. In addition, the base 3312 is accommodated in the lower counterbore 312, so that the length of the pole 331 extending into the housing 100 can be reduced, and the utilization rate of the internal space of the housing 100 can be improved, which is beneficial to improving the energy density of the battery cell 10.

Referring again to fig. 4, in the present embodiment, a gap (not shown) is formed between the sidewall of the base 3312 and the sidewall of the lower counterbore 312, and the first insulating plate 320 extends into the gap. In this way, the sealability between the pole 331 and the cap plate 310 can be improved.

After the battery unit 10 and the top cap assembly 300 are assembled with the cover plate 310, the first insulating plate 320 can be well limited to the cover plate 310 through the fit of the non-circular protruding structure 311 and the groove structure 321, so that the first insulating plate 320 is not easy to displace relative to the cover plate 310. Moreover, friction exists between the base 3312 of the pole 331 and the first insulating plate 320, so that the pole 331 is not easy to move relative to the first insulating plate 320, and a good limiting effect can be achieved on the pole 331, so that the pole 331 is effectively prevented from rotating, and sealing failure between the pole 331 and the cover plate 310 due to rotation of the pole 331 is avoided. 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:

the cover plate is provided with a mounting hole;

2. The header assembly of claim 1, wherein the projection structure is provided as an annular boss surrounding the mounting hole and the recess structure is provided as an annular recess matching the annular boss.

3. The header assembly of claim 1, wherein the raised structures have a height of 0.1mm to 1mm relative to the back of the cover plate.

4. The header assembly of claim 1, wherein the raised structure is disposed on the cover plate, the base is positioned within a non-circular area defined by the raised structure, and a side profile of the base is configured to match a shape of the non-circular area.

5. The header assembly of claim 4, wherein the non-circular region is countersunk relative to a rear surface of the cover plate to form a non-circular lower counterbore within which the base is received.

6. The header assembly of claim 5, wherein a gap is formed between a sidewall of the base and a sidewall of the lower counterbore, the first insulating plate extending into the gap.

7. The top cap assembly of claim 1, wherein the pole assembly further comprises a second insulating plate, the pole further comprises a compression ring disposed at intervals along the axial direction of the main body with the base, and the second insulating plate is sleeved on the main body and is compressed on the front surface of the cover plate by the compression ring.

8. A battery cell, comprising:

a housing having an opening formed at least one side;

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.