CN219226546U

CN219226546U - Battery monomer, battery and power consumption device

Info

Publication number: CN219226546U
Application number: CN202223528774.0U
Authority: CN
Inventors: 何金磊; 包瑞奇; 赵艺惠; 李磊
Original assignee: Shanghai Lanjun New Energy Technology Co Ltd
Current assignee: Shanghai Lanjun New Energy Technology Co Ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-06-20
Anticipated expiration: 2032-12-28

Abstract

The utility model relates to a battery cell, a battery and an electric device. The top cover assembly comprises a top cover and a pole, wherein a welding surface and a coating surface surrounding the welding surface are formed on a base of the pole, and the coating surface is separated from the welding surface by an isolation structure. When the pole and the adapter plate are welded, the heat conducting material can be arranged on the coating surface, and then the adapter plate is welded on the welding surface. Because the welding surface and the coating surface are separated by the isolation structure, impurities can be prevented from polluting the welding surface when the heat conducting material is arranged, and therefore the situations of cold joint, explosion welding and the like caused by pollution of the welding surface are avoided. And the heat conduction material is arranged between the switching sheet and the coating surface, so that the heat conduction efficiency between the switching sheet and the non-welding area of the pole base is effectively improved, and heat can be quickly conducted to the pole by the switching sheet and dissipated to the outside, and the heat dissipation efficiency of the battery is improved.

Description

Battery monomer, battery and power consumption device

Technical Field

The utility model relates to the technical field of new energy, in particular to a battery monomer, 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 pole post is arranged on the existing top cover component, and the pole lug of the battery core component is connected with the pole post on the top cover component through the switching piece, so that a complete overcurrent loop is formed.

When the battery works, heat generated in the battery core assembly is transferred to the switching piece through the lug, then transferred to the pole by the switching piece, and finally emitted to the external environment by the pole. The adapter piece is connected with the base of the pole by welding, and is limited by the process, and the welding area between the base of the pole and the adapter piece is only five percent to ten percent of the whole area of the base. The non-welding area may have poor heat conduction efficiency due to the gaps, so that heat conduction between the adapter plate and the pole is not smooth, and heat inside the battery cannot be timely dissipated to the outside.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a battery cell, a battery, and an electric device that improve heat dissipation efficiency.

A battery cell comprising:

a housing having an opening formed at one side thereof;

the battery cell assembly is accommodated in the shell and provided with a tab;

the top cover assembly is hermetically arranged at the opening and comprises a cover plate and a pole penetrating through the cover plate, a welding surface and a coating surface surrounding the welding surface are formed on a base of the pole, and the coating surface is separated from the welding surface by an isolation structure; and

And one end of the switching sheet is welded with the lug, the other end of the switching sheet is welded with the welding surface, and a heat conducting material is arranged between the coating surface and the switching sheet.

In one embodiment, the base of the pole is formed with an annular protrusion along the circumferential direction of the welding surface, and the annular protrusion forms the isolation structure.

In one embodiment, the base of the pole is provided with an annular groove along the circumferential direction of the welding surface, and the annular groove forms the isolation structure.

In one embodiment, the base of the pole is formed with a plurality of baffles arranged at intervals along the circumferential direction of the welding surface, and the plurality of baffles form the isolation structure.

In one embodiment, the coated surface is provided as a roughened surface.

In one embodiment, the thermally conductive material is a thermally conductive silicone or a metal foil.

In one embodiment, the welding surface and the coating surface are parallel to each other and are each perpendicular to the axis of the pole.

In one embodiment, the cover plate is in a strip shape, and two poles are respectively arranged at two ends of the length direction of the cover plate.

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

An electrical device comprising a battery as claimed in any one of the above preferred embodiments or as claimed in the above preferred embodiments.

When the battery cell is welded with the pole column and the switching piece, the heat conducting material can be arranged on the coating surface, and then the switching piece is welded on the welding surface. Because the welding surface and the coating surface are separated by the isolation structure, the arrangement of the heat conducting material can avoid impurity pollution to the welding surface, thereby avoiding the situations of cold joint, explosion welding and the like caused by the pollution of the welding surface. And the heat conduction material is arranged between the switching sheet and the coating surface, so that the heat conduction efficiency between the switching sheet and the non-welding area of the pole base is effectively improved, and heat can be quickly conducted to the pole by the switching sheet and dissipated to the outside, and the heat dissipation efficiency of the battery is improved.

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 an exploded 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 a schematic diagram illustrating a connection relationship between a post and a tab in the battery cell shown in fig. 1;

FIG. 5 is a schematic view of the pole shown in FIG. 4;

fig. 6 is a schematic structural view of a pole according to another embodiment of the present utility model.

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 and a battery. 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.

Referring to fig. 1, the present utility model further provides a battery cell 10, and the power utilization device may also include the battery cell 10 and be powered by the battery cell 10. The battery can 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 battery cells 10.

The plurality of battery cells 10 can be electrically connected in series, parallel or a combination of series and parallel, and are in communication connection with a battery management system for controlling and monitoring the operating states of the battery cells 10 to form a battery pack. In addition, the plurality of battery cells 10 may be connected in series and/or in parallel, and form a battery module with the module management system, and then the plurality of battery modules are electrically connected in series, in parallel or in a mixed manner of series and parallel, and form a battery pack together with the battery management system.

In the above battery, the plurality of battery cells 10 may be mounted on a supporting structure such as a case, a frame, a bracket, etc., and the battery cells 10 may be electrically connected to each other, or the battery cells 10 and the battery management system may be electrically connected to each other by a bus member. The battery cell 10 may be a lithium ion battery, a sodium ion battery or a magnesium ion battery, and its outer contour may be a cylinder, a flat body, a rectangular parallelepiped or other shapes, but is not limited thereto. In particular, in the present embodiment, the battery cell 10 is a lithium ion prismatic battery.

Referring to fig. 4, the battery cell 10 according to the preferred embodiment of the utility model includes a housing 100, a cell assembly 200, a cap assembly 300 and a connecting plate 400.

The housing 100 is used for accommodating the battery cell assembly 200, the electrolyte and other components, and is generally formed of materials such as aluminum, aluminum alloy and stainless steel, and has high mechanical strength. An opening (not shown) is formed at one side of the case 100, through which the cell assembly 200 can be mounted in the case 100. In particular, in the present embodiment, the outer contour of the housing 100 has a rectangular parallelepiped shape.

The cell assembly 200 is a core component of the battery cell 10. To adapt to the shape of the housing 100, the cell assembly 200 in this embodiment is flat. Specifically, the cell assemblies 200 generally include a bare cell 210 and an insulating sheet 220, and each cell assembly 200 may include one or more bare cells 210. The bare cell 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 cell 210 formed by winding may be pressed into a flat shape. The insulating sheet 220 is coated on the outer periphery of the bare cell 210, and exposes the tab of the bare cell 210. The insulating sheet 220 may be polyimide, polyethylene, polyvinylidene fluoride, or the like, and can protect the bare cell 210 and perform a good insulating function between the bare cell 210 and the inner wall of the case 100.

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 this embodiment, the top cover assembly 300 is substantially rectangular.

Referring to fig. 2 and 3, the top cover assembly 300 includes a cover plate 310 and a pole 330. The pole 330 is mounted on the cover 310 and penetrates the cover 310 in the thickness direction.

The cover plate 310 may be formed of a material having high mechanical strength, such as aluminum, aluminum alloy, or stainless steel. The cover plate 310 includes an outer surface and an inner surface, which are oppositely disposed, and the inner surface refers to a surface of the cover plate 310 facing the inside of the case 110 when the cap assembly 300 seals the opening of the case 100. The inner surface of the cover 310 is also generally provided with an injection molded lower plastic 320, and the lower plastic 320 has a substantially rectangular shape as the cover 310. The cover plate 310 is generally provided with a liquid injection hole 311 penetrating in the thickness direction, the liquid injection hole 311 is generally a circular hole, and the positions of the lower plastic 320 corresponding to the liquid injection hole 311 are also provided with through holes (not shown). After the cap assembly 300 seals the opening of the case 100, the electrolyte may be injected into the inside of the case 100 through the injection hole 311. After the injection is completed, the injection hole 311 is also plugged by laser welding.

In addition, in the present embodiment, the cover plate 310 is provided with a explosion-proof hole (not shown) 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. When the gas pressure in the case 100 exceeds a threshold value, the explosion-proof valve 340 is opened to release the pressure in the case 100, thereby preventing the explosion of the battery cell 10.

It should be appreciated that in other embodiments, the explosion proof holes in the cover plate 310 may be omitted and the explosion proof valve 340 may be disposed on the sidewall of the housing 100.

The cover 310 and the lower plastic 320 are provided with mounting holes (not shown) through which the pole 330 passes. Specifically, the pole 330 is inserted into the mounting hole, the pole 330 is pressed against the edge of the mounting hole by the pressing ring, and the upper and lower sides of the pole 330 and the cover 310 are respectively insulated and sealed by the upper rubber ring and the sealing ring. The two posts 330 are generally provided and distributed at both ends of the cover 310 in the longitudinal direction, and can serve as positive and negative terminals of the battery cell 10, respectively.

The end of the pole 330 extending into the housing 100 is electrically connected to the tab of the cell assembly 200 via the switching tab 400. Specifically, a base (not shown) is disposed at one end of the pole 330 extending into the housing 100, and two ends of the adapter piece 400 are welded to the pole lug of the battery cell assembly 200 and the base of the pole 330, respectively. Correspondingly, two switching pieces 400 are also provided to electrically connect the tabs of the positive electrode and the negative electrode of the battery cell assembly 200 with the posts 330 of the positive electrode and the negative electrode, respectively. The switching sheet 400 is of a metal sheet structure, and specifically, the switching sheet 400 for connecting the tab of the positive electrode with the post 330 of the positive electrode may be an aluminum sheet, and the switching sheet 400 for connecting the tab of the negative electrode with the post 330 of the negative electrode may be a copper sheet.

Referring to fig. 5 and 6, a welding surface 301 and a coating surface 302 are formed on the base of the pole 330, and the coating surface 302 surrounds the welding surface 301. Furthermore, the coated surface 302 and the welded surface 301 are separated by an isolating structure.

The number of the welding surfaces 301 may be one or a plurality of the welding surfaces may be spaced apart from each other. When the welding surface 301 is one, the coating surface 302 is disposed around the circumference of the welding surface 301; when the number of the welding surfaces 301 is plural, the coating surface 302 is disposed entirely around the circumferential direction of the plurality of welding surfaces 301 and extends into the gaps between the plurality of welding surfaces 301.

The above-described isolation structure may take many forms as long as it is capable of physically isolating the coated face 302 from the welded face 301. As shown in fig. 5, in the present embodiment, the base of the pole 330 is formed with an annular protrusion 331 along the circumferential direction of the welding surface 301, and the annular protrusion 331 constitutes the above-described isolation structure. Annular projection 331 may be continuous or discontinuous with a gap therebetween.

In another embodiment, as shown in fig. 6, the base of the pole 330 is provided with an annular groove 332 along the circumferential direction of the welding surface 301, and the annular groove 332 forms the above-mentioned isolation structure. Specifically, the annular groove 332 may be formed on the surface of the base of the pole 330 by punching and etching, and the isolation structure formed by the annular groove 332 does not protrude from the surface of the base of the pole 330, so that the space occupied by the pole 330 can be reduced, thereby being beneficial to improving the battery capacity.

Obviously, in other embodiments, the above-mentioned isolation structure may be of other forms. For example, the base of the pole 330 is formed with a plurality of barriers (not shown) spaced apart along the circumference of the welding surface 301, and the barriers constitute the above-mentioned isolation structure.

Referring to fig. 4 again, one end of the adapting piece 400 is welded to the tab, the other end is welded to the welding surface 301, and a heat conducting material (not shown) is disposed between the coating surface 302 and the adapting piece 400. The shape of the portion of the tab 400 welded to the base of the pole 330 matches the shape of the base surface. For example, when the isolation structure is the annular protrusion 331, the adapting piece 400 is formed with a recess into which the annular protrusion 331 can be clamped; when the isolation structure is the annular groove 332, the adaptor piece 400 is formed with a protrusion portion capable of being snapped into the annular groove 332.

It should be noted that the coating surface 302 and the welding surface 301 may be in the same plane or in different planes.

When the adapter piece 400 is welded to the pole 330, a heat-conducting paint, which may be a heat-conducting silica gel, may be coated on the coated surface 302; alternatively, a layer of metal foil with good heat conduction performance may be first laid on the coated surface 302, and the metal foil may be copper foil, aluminum foil, or the like. Since the welding surface 301 and the coating surface 302 are separated by the above-mentioned isolation structure, contamination of the welding surface 301 can be avoided when a heat conductive paint is applied or a metal foil is interposed, thereby ensuring the cleanliness of the welding surface 301. Then, the transfer sheet 400 is welded to the welding surface 301 by laser welding or the like. At this time, the space between the adaptor 400 and the coating surface 302, that is, the space between the adaptor 400 and the non-welding area of the base of the post 330 is filled with heat conductive materials such as heat conductive paint and metal foil, so that the heat conduction efficiency between the adaptor 400 and the non-welding area of the base of the post 330 is effectively improved, and the heat conducted from the battery cell assembly 200 to the adaptor 400 can be more rapidly conducted to the post 330.

In addition, when the isolation structure is the annular groove 332, the isolation structure can also serve to accommodate the excessive heat conductive paint. When too much thermally conductive coating is applied to the application surface 302, the excess thermally conductive coating can flow into the annular recess 332 under the compression of the patch 400, thereby avoiding spillage of the thermally conductive coating.

In the present embodiment, the coated surface 302 is provided as a roughened surface. That is, the surface of the coating surface 302 is formed with a microstructure, so that the coating surface 302 can enhance the adhesion with the heat conductive material and increase the contact area, thereby being beneficial to further improving the heat conduction efficiency of the non-welding area of the rotating sheet 400 and the pole 330 base.

In this embodiment, the welding face 301 and the coating face 302 are parallel to each other and are both perpendicular to the axis of the pole 330. The axis of the post 330 extends generally in the thickness direction of the cap plate 310 and is perpendicular to the surface of the adapter plate 400. Therefore, the arrangement of the welding surface 301 and the coating surface 302 perpendicular to the axis of the pole 330 can make the adapter piece 400 better fit with the welding surface 301 and the coating surface 302, thereby avoiding the generation of gaps.

In the above-described battery cell 10, when the electrode post 330 and the tab 400 are welded, a heat conductive material may be disposed on the coating surface 302, and then the tab 400 may be welded to the welding surface 301. Since the welding surface 301 and the coating surface 302 are separated by the isolation structure, impurities can be prevented from polluting the welding surface 301 when the heat conducting material is arranged, and therefore the situations of cold joint, explosion welding and the like caused by pollution of the welding surface 301 are avoided. In addition, the heat conducting material is disposed between the adaptor 400 and the coating surface 302, so that the heat conduction efficiency between the adaptor 400 and the non-welding area of the base of the pole 330 is effectively improved, and the heat can be more quickly conducted from the adaptor 400 to the pole 330 and dissipated to the outside, so that the heat dissipation efficiency of the battery cell 10 is improved.

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 battery cell, comprising:

a housing having an opening formed at one side thereof;

the battery cell assembly is accommodated in the shell and provided with a tab;

2. The battery cell according to claim 1, wherein the base of the post is formed with an annular protrusion along the circumferential direction of the welding surface, the annular protrusion constituting the isolation structure.

3. The battery cell of claim 1, wherein the base of the post defines an annular groove along the perimeter of the weld face, the annular groove forming the isolation structure.

4. The battery cell as recited in claim 1, wherein the base of the post is formed with a plurality of baffles disposed at intervals along the circumferential direction of the welding surface, the plurality of baffles constituting the isolation structure.

5. The battery cell of claim 1, wherein the coated surface is provided as a roughened surface.

6. The battery cell of claim 1, wherein the thermally conductive material is a thermally conductive silicone or a metal foil.

7. The battery cell of claim 1, wherein the weld face and the coated face are parallel to each other and are each perpendicular to an axis of the post.

8. The battery cell according to any one of claims 1 to 7, wherein the cap plate has a strip shape, and two of the poles are provided at both ends of the cap plate in a length direction, respectively.

9. A battery comprising a plurality of cells according to any one of claims 1 to 8.

10. An electrical device comprising a battery cell according to any one of claims 1 to 8 or a battery according to claim 9.