Top cover assembly and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a top cover assembly and a battery. The top cover assembly comprises a top cover piece, a pole and a reinforcing part, the pole penetrates to the outer side of the top cover piece from the inner side of the top cover piece through a pole hole, the reinforcing part is arranged on the outer side of the top cover piece and surrounds the peripheral side of the pole, the top surfaces of the adjacent areas of the pole and the reinforcing part are located on the same plane to form a welding platform, and the pole and the reinforcing part are welded and connected at the welding platform; the connection effect of the pole and the reinforcer is improved, and the structural stability and reliability of pole connection are improved; and the pole and the reinforcer are welded at the welding platform, so that the welding effect is improved, and the structural stability and reliability of pole connection are further improved. By applying the top cover assembly to the battery, better battery quality and longer service life can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a top cover assembly and a battery. Background Art

[0002] Lithium batteries are widely used in energy storage base stations, electric vehicles, consumer electronics and other products due to their high specific energy, long service life, no memory effect, low self-discharge rate and environmental friendliness.

[0003] A battery includes a battery cell, a housing and a top cover assembly. One end of the housing is open, and the top cover assembly is arranged at the open end of the housing. The top cover assembly and the housing together form a receiving space, and the battery cell is accommodated in the receiving space. As an important component of a power battery, the top cover assembly plays roles such as sealing, integrating a liquid injection port, integrating an explosion-proof valve port, and transmitting and conducting current in the battery. The top cover assembly includes a pole column. As a component for transmitting and conducting current in the top cover assembly, the structural design of the pole column has an important influence on the performance of the battery such as capacity, energy density, electrothermal performance and safety.

[0004] In the prior art, the pole column is riveted on a metal ring and formed into a contact connection by riveting, rather than a fixed connection. The structural tightness and reliability of the pole column riveted connection are poor.

[0005] Therefore, there is an urgent need for a top cover assembly and a battery to solve the above problems. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a top cover assembly and a battery, which can improve the structural stability and reliability of the pole column connection and extend the service life of the battery.

[0007] To achieve the above purpose, the following technical solutions are provided:

[0008] A top cover assembly, comprising:

[0009] A top cover sheet, wherein a pole column hole is formed in the top cover sheet;

[0010] A pole column, the pole column passes through the pole column hole from the inner side of the top cover sheet to the outer side of the top cover sheet;

[0011] A reinforcing member, the reinforcing member is arranged on the outer side of the top cover sheet and surrounds the circumference of the pole column. The top surfaces of the adjacent regions of the pole column and the reinforcing member are in the same plane to form a welding platform, and the pole column and the reinforcing member are welded at the welding platform.

[0012] As an optional solution, the top cover assembly further comprises:

[0013] An upper plastic part, the upper plastic part is sleeved on the reinforcing member and at least partially clamped between the top cover sheet and the reinforcing member.

[0014] As an alternative, the outer peripheral surface of the reinforcing member includes an arc portion and an anti-rotation plane, and the inner wall surface of the upper plastic member fits with the outer peripheral surface of the reinforcing member.

[0015] As an alternative, the top cover sheet is provided with a stop ring around the periphery of the pole column. The stop ring is a multi-sided ring, and the side of the multi-sided ring can stop the apex angle of the reinforcing member, wherein the apex angle is formed at the connection between the arc portion and the anti-rotation plane.

[0016] As an alternative, the top cover assembly further includes an anti-twist structure. The anti-twist structure includes an anti-twist protrusion and an anti-twist groove. Among the surfaces of the top cover sheet and the upper plastic member facing each other, one is provided with the anti-twist protrusion and the other is provided with the anti-twist groove, and the anti-twist protrusion and the anti-twist groove are inserted and matched with each other.

[0017] As an alternative, the anti-twist protrusion is arranged in a ring around the reinforcing member and is non-circular.

[0018] As an alternative, the pole column includes an abutting portion and a vertical portion connected to each other. A receiving groove is formed in the top cover sheet, and the abutting portion is arranged in the receiving groove.

[0019] As an alternative, the top cover assembly further includes a sealing member. The sealing member is arranged on the outer periphery of the pole column and is located between the top cover sheet and the pole column.

[0020] As an alternative, the cross section of the sealing member is L-shaped.

[0021] A battery includes a housing, an electric core, and the above-mentioned top cover assembly. The electric core is accommodated in the housing. One end of the housing is open, and the top cover assembly is arranged at the open end of the housing.

[0022] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0023] The top cover assembly provided by the present utility model includes a top cover sheet, a pole column, and a reinforcing member. The pole column passes through from the inner side of the top cover sheet through the pole column hole to the outside of the top cover sheet. The reinforcing member is arranged outside the top cover sheet and surrounds the periphery of the pole column. The top surfaces of the adjacent regions of the pole column and the reinforcing member are in the same plane to form a welding platform, and the pole column and the reinforcing member are welded and connected at the welding platform. By welding the pole column and the reinforcing member, it helps to improve the connection effect between the pole column and the reinforcing member, and improve the structural stability and reliability of the pole column connection; by making at least part of the pole column and the top surface of the reinforcing member be in the same plane to form a welding platform and welding the pole column and the reinforcing member at the welding platform, it helps to improve the welding effect, and further improve the structural stability and reliability of the pole column connection.

[0024] The battery provided by the present utility model can ensure better battery quality and longer service life by applying the above-mentioned top cover assembly. Brief Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments of the present utility model. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present utility model and these drawings.

[0026] Figure 1 Structural schematic diagram of the top cover assembly provided by the embodiment of the present utility model;

[0027] Figure 2 is Figure 1 Cross-sectional view taken along line A-A in

[0028] Figure 3 is Figure 2 Partial enlarged view at B in

[0029] Figure 4 Partial structural schematic diagram of the top cover assembly provided by the embodiment of the present utility model;

[0030] Figure 5 Structural schematic diagram of the top cover sheet and the stop ring provided by the embodiment of the present utility model.

[0031] Reference Numerals:

[0032] 100, top cover assembly;

[0033] 10, top cover sheet; 11, anti-twist protrusion; 12, explosion-proof hole; 13, pole hole; 14, stop ring;

[0034] 20, pole; 21, abutting portion; 22, vertical portion;

[0035] 30, strengthening member; 31, anti-rotation plane; 32, arc portion;

[0036] 40, welding platform;

[0037] 50, upper plastic part;

[0038] 60, sealing member; 61, first part; 62, second part. Detailed Embodiments

[0039] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. A lot of specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0040] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0041] In addition, if terms such as "first" and "second" appear, these terms are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0042] In the present application, unless otherwise clearly specified and limited, if terms such as "mounted", "connected", "connected to", "fixed" appear, these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0043] In this application, unless otherwise clearly specified and defined, if there is a description such as a first feature being "on" or "under" a second feature, its meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0045] This embodiment provides a battery, which includes a housing, a top cover assembly 100 and an electric core. Among them, the electric core is accommodated in the housing, and the housing realizes the functions of better supporting and protecting the electric core. The top end of the housing is provided with an open mouth, and the top cover assembly 100 is arranged at the open end of the housing. The top cover assembly 100 and the housing form a sealed space, which plays a role in encapsulating the electric core.

[0046] As Figures 1-3 shown, the top cover assembly 100 includes a top cover sheet 10 and pole columns 20. The top cover sheet 10 is provided with pole column holes 13, and the pole columns 20 pass through the pole column holes 13 from the inner side of the top cover sheet 10 to the outside of the top cover sheet 10. The number of the pole columns 20 is two. One of the two pole columns 20 is a positive pole column, and the other is a negative pole column. The positive electrode of the electric core is connected to the positive pole column, and the negative electrode of the electric core is connected to the negative pole column. The top surface of the pole column 20 is connected to the electrical device, realizing the power supply function of the electric core to the electrical device.

[0047] The top cover assembly 100 further includes a lower plastic part (not shown in the figure). The lower plastic part is arranged below the top cover sheet 10 and is used to insulate the top cover sheet 10 from the electric core to prevent the electric core from being short-circuited with the top cover sheet 10.

[0048] The top cover assembly 100 further includes an explosion-proof sheet (not shown in the figure). The top cover sheet 10 is provided with an explosion-proof hole 12, and the explosion-proof sheet is welded in the explosion-proof hole 12. During use, when gas is generated in the housing and the air pressure in the housing reaches the explosion-proof threshold of the explosion-proof sheet, the explosion-proof sheet breaks, and the gas is discharged from the explosion-proof hole 12, releasing the internal pressure of the battery, thereby avoiding the housing from bursting.

[0049] The top cover assembly 100 further includes a protection sheet (not shown in the figure). The protection sheet is disposed within the explosion-proof hole 12 and above the explosion-proof sheet. The protection sheet is used to protect the explosion-proof sheet to prevent the explosion-proof sheet from cracking and failing due to external pressure on the battery. A weak part is provided on the protection sheet. When the explosion-proof sheet cracks, the protection sheet can burst open from the weak part to release gas.

[0050] In the prior art, the pole column 20 is riveted to the metal ring, and the riveting forms a contact connection, not a fixed connection. The structural tightness and reliability of the riveted connection of the pole column 20 are relatively poor.

[0051] To solve the above problems, as Figures 1-3 shown, the top cover assembly 100 provided in this embodiment further includes a reinforcing member 30. The reinforcing member 30 is disposed outside the top cover sheet 10 and surrounds the circumferential side of the pole column 20. The top surfaces of the adjacent regions of the pole column 20 and the reinforcing member 30 are in the same plane to form a welding platform 40. The pole column 20 and the reinforcing member 30 are welded at the welding platform 40, which helps to improve the connection effect between the pole column 20 and the reinforcing member 30 and improve the structural stability and reliability of the connection of the pole column 20; by making the top surfaces of the adjacent regions of the pole column 20 and the reinforcing member 30 in the same plane to form the welding platform 40 and welding the pole column 20 and the reinforcing member 30 at the welding platform 40, it helps to prevent the problem of welding misalignment caused by the top surfaces of the adjacent regions of the pole column 20 and the reinforcing member 30 not being in the same horizontal plane, improve the welding effect, and further improve the structural stability and reliability of the connection of the pole column 20.

[0052] The top cover assembly 100 further includes a seal 60. The seal 60 is disposed on the outer periphery of the pole column 20 and between the top cover sheet 10 and the pole column 20. At least part of the seal 60 is located within the pole column hole 13 to improve the sealing performance at the pole column 20 and prevent the electrolyte inside the battery case from leaking to the outside of the battery. Specifically, the seal 60 can be a fluororubber seal ring or a rubber seal ring, etc., which has the advantages of good sealing effect and excellent durability.

[0053] Optionally, as Figure 3 shown, the seal 60 includes a first part 61 and a second part 62. The first part 61 is disposed within the pole column hole 13 and between the pole column 20 and the top cover sheet 10; the second part 62 is disposed inside the top cover sheet 10 and between the top cover sheet 10 and the pole column 20. The cross section of the seal 60 is generally L-shaped, which improves the sealing performance on the one hand; and prevents short circuits caused by burrs formed during the processing of the top cover sheet 10 and the pole column 20 on the other hand.

[0054] As Figures 1-3As shown, the terminal post 20 includes an abutting portion 21 and a vertical portion 22 connected to each other. The diameter of the abutting portion 21 is greater than the diameter of the terminal post hole 13. By means of the abutting portion 21, the abutting area between the terminal post 20 and the top cover plate 10 is increased, and the connection stability between the terminal post 20 and the top cover plate 10 is improved.

[0055] Optionally, a receiving groove is formed in the top cover plate 10, and the abutting portion 21 is arranged in the receiving groove. By arranging the abutting portion 21 in the receiving groove, the height of the terminal post 20 in the vertical direction can be reduced, thereby reducing the height of the battery and improving the energy density of the battery.

[0056] Optionally, the top cover assembly 100 further includes an upper plastic part 50. The upper plastic part 50 is sleeved on the reinforcing part 30 and at least partially clamped between the top cover plate 10 and the reinforcing part 30. The reinforcing part 30 is insulated and connected to the top cover plate 10 through the upper plastic part 50.

[0057] Optionally, the upper surface of the upper plastic part 50 and the upper surface of the reinforcing part 30 are in the same plane, so that the structure of the upper plastic part 50 and the reinforcing part 30 is compact.

[0058] During assembly, the upper plastic part 50 is pre-injected. After the seal 60 is sleeved on the terminal post 20, the terminal post 20 is inserted into the terminal post hole 13 from below the top cover plate 10, and the reinforcing part 30 is sleeved on the terminal post 20. The terminal post 20 and the reinforcing part 30 are riveted and pressed, so that the seal 60 is compressed by 30%-50%. The upper surface of the reinforcing part 30 is flush with the upper surface of the terminal post 20 to form a welding platform 40. The reinforcing part 30 and the terminal post 20 are welded at the welding platform 40, and the terminal post 20 and the reinforcing part 30 are tightly connected together by welding. Optionally, after the terminal post 20 is pre-stamped, after assembly, the upper surface of the reinforcing part 30 is flush with the upper surface of the terminal post 20 to form a welding platform 40, and the riveting process is omitted.

[0059] As Figure 1 and Figure 4 shown, the outer peripheral surface of the reinforcing part 30 includes an arc portion 32 and an anti-rotation plane 31. The inner wall surface of the upper plastic part 50 fits the outer peripheral surface of the reinforcing part 30 to realize the limitation of the reinforcing part 30 and prevent the reinforcing part 30 from rotating relative to the top cover plate 10.

[0060] Optionally, as Figures 3-5 shown, the top cover plate 10 is provided with a stop ring 14 around the periphery of the terminal post 20. The stop ring 14 is a multi-sided ring shape, and the side of the multi-sided ring shape can stop the top angle of the reinforcing part 30. The connection part of the arc portion 32 and the anti-rotation plane 31 forms a top angle, further preventing the reinforcing part 30 from rotating relative to the top cover plate 10.

[0061] Optionally, the top cover assembly 100 further includes an anti-twist structure. The anti-twist structure includes an anti-twist protrusion 11 and an anti-twist groove. The surface of the top cover sheet 10 facing the upper plastic part 50 is provided with the anti-twist protrusion 11, and the surface of the upper plastic part 50 facing the top cover sheet 10 is provided with the anti-twist groove. The anti-twist protrusion 11 is inserted and matched with the anti-twist groove to prevent the upper plastic part 50 from rotating relative to the top cover sheet 10, thereby further realizing the anti-torsion of the pole column 20. Among them, the anti-twist protrusion 11 can also block the inward penetration of the electrolyte. If the electrolyte penetrates from the outside to the inside at the positive electrode, it will reduce the internal resistance between the pole column 20 and the housing. If the electrolyte penetrates from the outside to the inside at the negative electrode, there may be a risk of short circuit. In other embodiments, the anti-twist protrusion 11 can be provided on the surface of the upper plastic part 50 facing the top cover sheet 10, and the anti-twist groove can be provided on the surface of the top cover sheet 10 facing the upper plastic part 50.

[0062] Optionally, the anti-twist protrusion 11 is arranged around the reinforcing member 30 and is non-circular, further improving the limiting effect of the anti-twist protrusion 11 on the upper plastic part 50 and further preventing the upper plastic part 50 from rotating relative to the top cover sheet 10.

[0063] It should be noted that the top cover sheet 10 is made of 3-series aluminum alloy, and the 3-series aluminum alloy has good hardness and weldability. The pole column 20 is made of 1-series aluminum alloy, and the 1-series aluminum alloy has good electrical conductivity. The reinforcing member 30 is made of 3-series or 7-series aluminum alloy or other metal materials, ensuring high hardness on the one hand and good welding reliability with the pole column 20 on the other hand. The upper plastic part 50 is made of modified PPS (Polyphenylene sulfide), which has good insulation performance.

[0064] Note that in the description of this specification, the descriptions referring to the reference terms "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] The above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. Top cover assembly, characterized in that, Comprising: A top cover sheet (10), the top cover sheet (10) being provided with a pole hole (13); A pole (20), the pole (20) passing through the pole hole (13) from the inner side of the top cover sheet (10) to the outside of the top cover sheet (10); A reinforcing member (30), the reinforcing member (30) being arranged on the outside of the top cover sheet (10) and surrounding the circumference of the pole (20), the top surfaces of the adjacent regions of the pole (20) and the reinforcing member (30) being in the same plane to form a welding platform (40), and the pole (20) and the reinforcing member (30) being welded and connected at the welding platform (40).

2. The top cover assembly according to claim 1, characterized in that The top cover assembly further comprises: An upper plastic part (50), the upper plastic part (50) being sleeved on the reinforcing member (30) and at least partially clamped between the top cover sheet (10) and the reinforcing member (30).

3. The top cover assembly according to claim 2, characterized in that, The outer peripheral surface of the reinforcing member (30) comprises an arc part (32) and an anti-rotation plane (31), and the inner wall surface of the upper plastic part (50) fits with the outer peripheral surface of the reinforcing member (30).

4. The top cover assembly according to claim 3, wherein, A stop ring (14) is arranged around the periphery of the pole (20) on the top cover sheet (10), the stop ring (14) being a multi-sided ring, and the side edges of the multi-sided ring can stop the top corners of the reinforcing member (30), wherein the connection part of the arc part (32) and the anti-rotation plane (31) forms the top corner.

5. The top cover assembly according to claim 2, characterized in that, The top cover assembly further comprises an anti-twist structure, the anti-twist structure comprising an anti-twist protrusion (11) and an anti-twist groove. Among the surfaces of the top cover sheet (10) and the upper plastic part (50) facing each other, one is provided with the anti-twist protrusion (11), and the other is provided with the anti-twist groove, and the anti-twist protrusion (11) is in plug-in fit with the anti-twist groove.

6. The top cover assembly according to claim 5, wherein, The anti-twist protrusion (11) is arranged in a ring around the reinforcing member (30) and is non-circular.

7. The top cover assembly according to any one of claims 1-6, characterized in that, The pole (20) comprises a connected abutting part (21) and a vertical part (22), and a receiving groove is formed on the top cover sheet (10), and the abutting part (21) is arranged in the receiving groove.

8. The top cover assembly according to any one of claims 1-6, characterized in that The top cover assembly further comprises a sealing member (60), the sealing member (60) being arranged on the outer periphery of the pole (20) and located between the top cover sheet (10) and the pole (20).

9. The top cover assembly according to claim 8, wherein, The sealing member (60) comprises a first part (61) and a second part (62), the first part (61) being arranged in the pole hole (13) and located between the pole (20) and the top cover sheet (10); the second part (62) is arranged on the inner side of the top cover sheet (10) and located between the top cover sheet (10) and the pole (20).

10. A battery, characterized in that, Comprising a housing, an electric core and the top cover assembly according to any one of claims 1-9, the electric core being accommodated in the housing, one end of the housing being open, and the top cover assembly being arranged at the open end of the housing.

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