Top cover assembly, battery and electric device

Abstract

The utility model relates to the technical field of batteries, in particular to a top cover assembly, a battery and an electric device. The top cover assembly comprises a top cover piece, a reinforcing piece and a pole, the pole penetrates to the outer side of the top cover piece from the inner side of the top cover piece through the pole hole, and a step is annularly arranged on the periphery of the end, located on the outer side of the top cover piece, of the pole; the reinforcer is supported on the step, and the pole is connected with the reinforcer through welding. According to the technical scheme, the reinforcing piece is supported by the pole column through the step, the stability of connection between the pole column and the reinforcing piece is improved, the pole column and the reinforcing piece are connected through welding, the connection effect between the pole column and the reinforcing piece is improved, and the structural stability and reliability of pole column connection are further improved. By applying the top cover assembly to the battery, better battery quality and longer service life can be ensured. The battery is applied to the power utilization device, so that a good power supply effect of the battery on the power utilization mechanism can be ensured, and good use performance of the power utilization mechanism is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a top cover assembly, a battery and an electric device. 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, the top cover assembly is arranged at the open end of the housing, and the top cover assembly and the housing together form a containing space, in which the battery cell is accommodated. 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. As a component for transmitting and conducting current in the top cover assembly, the structure design of the pole column assembly has an important impact 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, and the structural tightness and reliability of the pole column riveting connection are poor.

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

[0006] The purpose of the utility model is to provide a top cover assembly, a battery and an electric device, which can improve the structural stability of the pole column connection and 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, in which a pole column hole is formed;

[0010] A pole column, which passes through the pole column hole from the inner side of the top cover sheet to the outside of the top cover sheet, and a step is provided around the outer circumference of the end of the pole column located outside the top cover sheet;

[0011] A reinforcing member, which is supported on the step, and the pole column and the reinforcing member are connected by welding.

[0012] As an optional solution, the reinforcing member is arranged outside the top cover sheet and surrounds the circumference of the pole column, and the top surfaces of the adjacent areas 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.

[0013] As an alternative, a mating surface is further provided on the outer periphery of the terminal post. The mating surface is provided on the side of the step away from the top cover sheet, and the mating surface is a cylindrical surface or a conical surface.

[0014] As an alternative, the top cover assembly further includes:

[0015] an upper plastic part, wherein:

[0016] at least a part of the upper plastic part is arranged between the top cover sheet and the reinforcing member; and / or

[0017] the upper plastic part covers the weld between the terminal post and the reinforcing member.

[0018] As an alternative, the top of the terminal post has a boss portion, the upper plastic part is disposed around the outer periphery of the boss portion, and the top surface of the upper plastic part is flush with the top surface of the boss portion.

[0019] As an alternative, the top cover assembly further includes:

[0020] 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 part 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 is in plug-in fit with the anti-twist groove.

[0021] As an alternative, the anti-twist protrusion is in the shape of a block, a strip, a ring, or a combination of any two or three of the above.

[0022] As an alternative, the terminal post 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 disposed in the receiving groove.

[0023] As an alternative, the top cover assembly further includes a sealing member, and the sealing member is disposed between the top cover sheet and the terminal post.

[0024] A battery, comprising 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 disposed at the open end of the housing.

[0025] An electrical device, comprising an electrical mechanism and the above-mentioned battery, and the battery is configured to supply electrical energy to the electrical mechanism.

[0026] Compared with the prior art, the beneficial effects of the present utility model are:

[0027] The top cover assembly provided by the present utility model includes a top cover sheet, a reinforcing member, and a terminal post. The terminal post passes through from the inner side of the top cover sheet through a terminal post hole to the outer side of the top cover sheet, and a step is annularly provided on the outer periphery of the end of the terminal post located on the outer side of the top cover sheet; the reinforcing member is supported on the step, and the terminal post and the reinforcing member are connected by welding. By providing a step to support the reinforcing member, the terminal post can support the reinforcing member, improving the stability of the connection between the terminal post and the reinforcing member. By connecting the terminal post and the reinforcing member by welding, it helps to improve the connection effect between the terminal post and the reinforcing member, and further improves the structural stability and reliability of the terminal post connection.

[0028] By applying the above top cover assembly, the battery provided by the present utility model can ensure good battery quality and a long service life.

[0029] By applying the above battery, the electrical device provided by the present utility model can ensure a good power supply effect of the battery to the electrical mechanism and ensure good performance of the electrical mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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 the description of 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.

[0031] Figure 1 It is a schematic structural diagram of the top cover assembly provided by the embodiment of the present utility model;

[0032] Figure 2 It is a cross-section of the top cover assembly provided by the embodiment of the present utility model Figure 1 ;

[0033] Figure 3 It is a cross-section of the top cover assembly provided by the embodiment of the present utility model Figure 2 ;

[0034] Figure 4 It is a partial structural schematic diagram of the top cover assembly provided by the embodiment of the present utility model Figure 1 ;

[0035] Figure 5 It is a partial structural schematic diagram of the top cover assembly provided by the embodiment of the present utility model Figure 2 ;

[0036] Figure 6 It is a partial structural schematic diagram of the top cover assembly provided by the embodiment of the present utility model Figure 3 .

[0037] REFERENCE MARKS:

[0038] 100. Top cover assembly;

[0039] 10. Top cover sheet; 11. Anti-twist protrusion; 12. Explosion-proof hole; 13. Terminal hole; 14. Accommodating groove;

[0040] 20. Terminal; 21. Contact part; 22. Vertical part; 221. Step; 222. Fitting surface; 23. Boss part;

[0041] 30. Reinforcing member; 31. Anti-rotation plane; 32. Arc part;

[0042] 40. Welding platform;

[0043] 50. Upper plastic part;

[0044] 60. Sealing member; 61. First part; 62. Second part; 63. Third part. Detailed implementation manner

[0045] In order to make the above objects, features and advantages of the present application more obvious and understandable, the following will describe in detail the specific implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand 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 connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0046] In the description of the present application, it should be understood that if there are 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", etc., 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 therefore should not be construed as a limitation of the present application.

[0047] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating 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 there is a term "plural", the meaning of "plural" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0048] In this application, unless otherwise clearly specified or limited, if terms such as "installed", "connected", "linked", "fixed", etc. appear, these terms shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] In this application, unless otherwise clearly specified or limited, 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 indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than 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 merely indicates that the first feature is at a lower horizontal level than the second feature.

[0050] 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.

[0051] This embodiment provides an electric device, which includes a battery and an electric mechanism. The battery can provide electrical energy to the electric mechanism, thereby enabling the electric mechanism to automatically complete a preset action through electrical energy, ensuring good performance of the electric mechanism, saving manpower, and improving productivity.

[0052] Specifically, the electrical device can be a vehicle, a mobile phone, a portable device, a laptop, a ship, a spacecraft, an electric toy or an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle or a hybrid electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator or a planer, etc. This embodiment does not limit the above electrical devices.

[0053] The battery provided in this embodiment 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 a good supporting and protecting effect on 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.

[0054] As Figures 1 - 3 shown, the top cover assembly 100 includes a top cover sheet 10 and a pole column 20. The top cover sheet 10 is provided with a pole column hole 13, which penetrates from the inner side of the top cover sheet 10 through the pole column hole 13 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 pole of the electric core is connected to the positive pole column, and the negative pole 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.

[0055] As Figures 1 - 3 shown, the pole column 20 includes a connected abutting portion 21 and a vertical portion 22. The diameter of the abutting portion 21 is greater than the diameter of the pole column hole 13. By increasing the abutting area of the pole column 20 and the top cover sheet 10 through the abutting portion 21, the connection stability between the pole column 20 and the top cover sheet 10 is improved.

[0056] Optionally, the top cover sheet 10 is provided with a receiving groove 14, and the abutting portion 21 is arranged in the receiving groove 14. By arranging the abutting portion 21 in the receiving groove 14, the height of the pole column 20 can be reduced in the vertical direction, thereby reducing the height of the battery and improving the energy density of the battery.

[0057] 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.

[0058] The top cover assembly 100 further includes an explosion-proof sheet (not shown in the figure). An explosion-proof hole 12 is formed in the top cover sheet 10, and the explosion-proof sheet is welded inside the explosion-proof hole 12. During use, when gas is generated inside the housing and the air pressure inside the housing reaches the explosion-proof threshold of the explosion-proof sheet, the explosion-proof sheet ruptures, and the gas is discharged from the explosion-proof hole 12 to release the internal pressure of the battery, thereby avoiding the explosion of the housing.

[0059] The top cover assembly 100 further includes a protection sheet (not shown in the figure). The protection sheet is disposed inside the explosion-proof hole 12 and above the explosion-proof sheet. The protection sheet is used to protect the explosion-proof sheet from being broken and invalidated due to external pressure on the battery. A weak portion is provided on the protection sheet. When the explosion-proof sheet ruptures, the protection sheet can burst open from the weak portion to release the gas.

[0060] 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.

[0061] 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. A step 221 is provided around the outer periphery of the end of the pole column 20 located outside the top cover sheet 10. The reinforcing member 30 is supported on the step 221, and the pole column 20 and the reinforcing member 30 are connected by welding. By providing the step 221 to support the reinforcing member 30, the pole column 20 supports the reinforcing member 30, improving the stability of the connection between the pole column 20 and the reinforcing member 30. By connecting the pole column 20 and the reinforcing member 30 by welding, it helps to improve the connection effect between the pole column 20 and the reinforcing member 30, and further improves the structural stability and reliability of the connection of the pole column 20.

[0062] 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 and connected at the welding platform 40. By making at least part of the pole column 20 flush with the top surface of the reinforcing member 30 to form the welding platform 40, welding the pole column 20 and the reinforcing member 30 at the welding platform 40 can prevent the problem of welding misalignment caused by the instability of the levelness due to the reinforcing member 30 and the pole column 20 not being in the same horizontal plane, which helps to improve the welding effect, and further improves the structural stability and reliability of the connection of the pole column 20.

[0063] As Figure 2 shown, a mating surface 222 is further provided on the outer periphery of the pole column 20. The mating surface 222 is provided on the side of the step 221 away from the top cover sheet 10. The mating surface 222 is a cylindrical surface. The reinforcing member 30 is supported on the step 221 and sleeved on the circumferential side of the cylindrical surface to improve the stability of the connection between the reinforcing member 30 and the pole column 20.

[0064] Optionally, as Figure 3 shown, the mating surface 222 is a conical surface. The reinforcing member 30 is supported on the step 221 and sleeved on the periphery of the conical surface, further improving the connection stability between the reinforcing member 30 and the terminal 20.

[0065] As Figures 1 - 3 shown, the top cover assembly 100 further includes a seal 60. The seal 60 is disposed on the outer periphery of the terminal 20 and located between the top cover sheet 10 and the terminal 20. At least a part of the seal 60 is located in the terminal hole 13 to improve the sealing performance at the terminal 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.

[0066] Optionally, as Figure 2 and Figure 3 shown, the seal 60 includes a first part 61, a second part 62 and a third part 63 which are connected to each other. The first part 61 is disposed between the reinforcing member 30 and the top cover sheet 10; the second part 62 is disposed in the terminal hole 13 and located between the terminal 20 and the top cover sheet 10; the third part 63 is disposed in the receiving groove 14 and located between the top cover sheet 10 and the terminal; the cross section of the seal 60 is generally U-shaped, on the one hand, improving the sealing performance and preventing the electrolyte from penetrating from the outside into the terminal 20; on the other hand, preventing a short circuit caused by burrs formed during the processing of the top cover sheet 10 and the terminal 20. In other embodiments, the seal 60 may also only include the second part 62 and the third part 63, and at this time the cross section of the seal 60 is L-shaped.

[0067] Optionally, the top cover assembly 100 further includes an upper plastic part 50. At least a part of the upper plastic part 50 is disposed between the top cover sheet 10 and the reinforcing member 30 and / or the upper plastic part 50 covers the weld between the terminal 20 and the reinforcing member 30. The reinforcing member 30 is insulated and connected to the top cover sheet 10 through the upper plastic part 50.

[0068] As Figures 1 - 3 shown, the top of the terminal 20 has a boss part 23. The upper plastic part 50 is disposed around the outer periphery of the boss part 23, and the top surface of the upper plastic part 50 is flush with the top surface of the boss part 23, making the structure of the top cover assembly 100 compact and the appearance more beautiful.

[0069] 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 into the anti-twist groove in a matching manner to prevent the upper plastic part 50 from rotating relative to the top cover sheet 10, thereby realizing the anti-twist of the pole column 20. In other embodiments, the anti-twist protrusion 11 may be provided on the surface of the upper plastic part 50 facing the top cover sheet 10, and the anti-twist groove may be provided on the surface of the top cover sheet 10 facing the upper plastic part 50.

[0070] The anti-twist protrusion 11 is in the shape of a block, a strip, a ring, or any combination of the above two or three. Exemplarily, as Figure 4 shown, the anti-twist protrusion 11 is in the shape of a strip. The number of the strip-shaped anti-twist protrusions 11 is two, and the two strip-shaped anti-twist protrusions 11 are arranged on both sides of the radial direction of the reinforcing member 30, and the two strip-shaped anti-twist protrusions 11 further improve the anti-twist effect on the pole column 20. As Figure 5 shown, the two strip-shaped anti-twist protrusions 11 are arranged at an angle with the radial direction of the reinforcing member 30, further improving the anti-twist effect on the pole column 20. As Figure 6 shown, the anti-twist protrusion 11 is a combination of a strip and a block, further improving the anti-twist effect on the pole column 20.

[0071] Optionally, when the anti-twist protrusion 11 is in the shape of a block, the number of the anti-twist protrusions 11 is multiple, and the multiple anti-twist protrusions 11 are arranged at intervals along the circumferential direction of the pole column 20, further improving the anti-twist effect on the pole column 20.

[0072] Optionally, when the anti-twist protrusion 11 is in the shape of a ring, it may be a non-circular ring, further improving the anti-twist effect on the pole column 20.

[0073] As Figures 4 - 6 shown, the outer peripheral surface of the reinforcing member 30 includes an arc portion 32 and an anti-rotation plane 31, and the inner wall surface of the upper plastic part 50 is attached to the outer peripheral surface of the reinforcing member 30 to realize the limit of the reinforcing member 30 and prevent the reinforcing member 30 from rotating relative to the top cover sheet 10.

[0074] 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0075] The above is only the preferred embodiment of the present utility model and the technical principles applied. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments described herein. 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 utility model. Therefore, although the present utility model has been described in more detail through the above embodiments, the present utility model is not limited to the above embodiments. Without departing from the concept of the present utility model, it can also include more other equivalent embodiments, and the scope of the present utility model 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), and a step (221) being annularly provided on the outer periphery of one end of the pole (20) located outside the top cover sheet (10); A reinforcing member (30), the reinforcing member (30) being supported on the step (221), and the pole (20) and the reinforcing member (30) being connected by welding.

2. The top cover assembly according to claim 1, characterized in that, The reinforcing member (30) is arranged outside the top cover sheet (10) and surrounds the circumferential side of the pole (20), and the top surfaces of the adjacent regions of the pole (20) and the reinforcing member (30) are in the same plane to form a welding platform (40), and the pole (20) and the reinforcing member (30) are welded and connected at the welding platform (40).

3. The top cover assembly according to claim 1, wherein, A mating surface is further provided on the outer periphery of the pole (20), the mating surface is arranged on the side of the step (221) away from the top cover sheet (10), and the mating surface is a cylindrical surface or a conical surface.

4. The top cover assembly according to claim 1, characterized in that The top cover assembly further includes an upper plastic part (50), wherein: The upper plastic part (50) is at least partially arranged between the top cover sheet (10) and the reinforcing member (30); and / or The upper plastic part (50) covers the weld seam between the pole (20) and the reinforcing member (30).

5. The top cover assembly according to claim 4, wherein The top of the pole (20) has a boss part (23), the upper plastic part (50) is annularly arranged on the outer periphery of the boss part (23), and the top surface of the upper plastic part (50) is flush with the top surface of the boss part (23).

6. The top cover assembly according to claim 4, wherein The top cover assembly further includes: An anti-twist structure, the anti-twist structure includes 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) and the anti-twist groove are inserted and matched.

7. The top cover assembly according to claim 6, characterized in that, The anti-twist protrusion (11) is in a block shape, a strip shape, a ring shape, or a combination of any two or three of the above.

8. The top cover assembly according to any one of claims 1-7, characterized in that, The top cover assembly further includes a sealing member (60), and the sealing member (60) is arranged between the top cover sheet (10) and the pole (20).

9. A battery, characterized in that, Comprising a housing, an electric core, and the top cover assembly according to any one of claims 1-8, 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.

10. Electric device, characterized in that, Comprising an electric appliance and the battery according to claim 9, the battery is configured to supply electric energy to the electric appliance.

Images