CN219642973U

CN219642973U - Cover plate assembly, battery and electric equipment

Info

Publication number: CN219642973U
Application number: CN202320251375.XU
Authority: CN
Inventors: 刘家瑾; 王飞飞; 杜勤明; 孙亚君; 许祖滨
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2023-02-08
Filing date: 2023-02-08
Publication date: 2023-09-05
Anticipated expiration: 2033-02-08

Abstract

The utility model discloses a cover plate assembly, a battery and electric equipment. The cover plate is provided with a first through hole, the pole column assembly penetrates through the first through hole, the pole column assembly is provided with a step sealing part, the sealing ring is clamped between the cover plate and the step sealing part, the outer periphery of the sealing ring is provided with an outer boss, and the outer boss is at least partially embedded and sealed with the step sealing part. In the cover plate assembly, the outer convex platform at the outer periphery of the sealing ring is at least partially embedded and sealed with the step sealing part of the pole assembly, so that after the sealing ring is compressed, the gap between the pole assembly and the cover plate is reduced, the risk of high-voltage conduction between the pole assembly and the cover plate is reduced, and further the risk of out-of-control electrical performance of the battery is reduced.

Description

Cover plate assembly, battery and electric equipment

Technical Field

The utility model relates to the technical field of batteries, in particular to a cover plate assembly, a battery and electric equipment.

Background

The battery comprises a cover plate assembly, the cover plate assembly comprises a pole assembly, a sealing ring and an aluminum cover plate, and the sealing ring seals the interval between the pole assembly and the aluminum cover plate to ensure the tightness of the battery. However, in the related art, a gap exists between the post assembly and the aluminum cover plate after the sealing ring is compressed, and when high-voltage charging and discharging occurs, the gap causes the risk of high-voltage conduction between the post assembly and the aluminum cover plate, and part of insulation voltage resistance cannot meet the requirement, so that the risk of electrical property out of control exists.

Disclosure of Invention

The embodiment of the utility model provides a cover plate assembly, a battery and electric equipment.

A cover plate assembly according to an embodiment of the present utility model includes:

the cover plate is provided with a first through hole;

the pole assembly penetrates through the first through hole and is provided with a step sealing part;

the sealing ring is clamped between the cover plate and the step sealing part, an outer boss is arranged on the outer periphery of the sealing ring, and the outer boss is at least partially embedded and sealed with the step sealing part.

In the cover plate assembly, the outer convex platform at the outer periphery of the sealing ring is at least partially embedded and sealed with the step sealing part of the pole assembly, so that after the sealing ring is compressed, the gap between the pole assembly and the cover plate is reduced, the risk of high-voltage conduction between the pole assembly and the cover plate is reduced, and further the risk of out-of-control electrical performance of the battery is reduced.

In some embodiments, the step seal has a first inclined surface inclined away from the outer boss in the first through hole axis direction, and the outer boss has a second inclined surface, the first inclined surface being in mating connection with the second inclined surface.

In some embodiments, the sealing ring includes a supporting portion and a penetrating portion, the supporting portion is connected to a periphery of the penetrating portion, the outer boss is disposed at an outer periphery of the supporting portion, the penetrating portion penetrates through the first through hole, and a groove is disposed at a portion of the penetrating portion opposite to an inner wall of the first through hole;

the cover plate assembly comprises an insulating part, the insulating part is arranged on one side of the cover plate, a second through hole aligned with the first through hole is formed in the insulating part, a convex part is arranged at the edge of the second through hole, and the convex part is at least partially filled in the groove.

In certain embodiments, the recess and the projection are both annular.

In certain embodiments, the pole assembly comprises:

the pole comprises a first connecting part and a second connecting part, wherein the first connecting part is connected to the top end of the second connecting part, the second connecting part penetrates through the first through hole, and the hole walls of the second connecting part and the first through hole are separated by the penetrating part and the protruding part.

In certain embodiments, the pole assembly comprises:

the plastic piece is used for wrapping the outer periphery of the first connecting part, the plastic piece is provided with the step sealing part, the step sealing part is positioned on the bottom surface of the first connecting part, and the step sealing part is arranged on the bottom surface of the first connecting part;

the fixing piece is fixedly connected with the plastic piece and the cover plate.

In some embodiments, the cover plate assembly includes a lead-out member, a third connecting portion is protruding from a top surface of the lead-out member, the third connecting portion is connected to the pole, the lead-out member is separated from the cover plate by the insulating member, and the third connecting portion is separated from an inner wall of the first through hole by the protruding portion.

In some embodiments, the cover plate is provided with a receiving groove, the first through hole is formed in the bottom surface of the receiving groove, and the pole assembly is partially received in the receiving groove.

The battery of the embodiment of the utility model comprises the cover plate assembly of any embodiment.

The electric equipment comprises the battery disclosed by the embodiment of the utility model.

Above-mentioned battery and consumer, through the design to apron subassembly structure, the outer boss of sealing washer periphery at least partly and the mutual gomphosis sealing connection of step sealing portion of utmost point post subassembly, reduced the clearance between utmost point post subassembly and the apron after the sealing washer compression, reduce the risk of high-pressure switch-on between utmost point post subassembly and the apron for this subassembly is optimized with insulating withstand voltage nature in whole power battery and is promoted, has stopped the inefficacy of battery electrical property in the use, guarantees the security of battery in the use.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the present utility model will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is an exploded schematic view of a closure assembly of an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a cover plate assembly according to an embodiment of the present utility model;

FIG. 3 is an enlarged schematic view of portion a of FIG. 2;

FIG. 4 is an enlarged schematic view of portion b of FIG. 2;

FIG. 5 is a schematic view of the seal ring according to the embodiment of the present utility model;

FIG. 6 is another schematic structural view of a seal ring according to an embodiment of the present utility model;

FIG. 7 is a cross-sectional view of a seal ring according to an embodiment of the present utility model;

fig. 8 is a schematic structural view of an insulator according to an embodiment of the present utility model;

FIG. 9 is an enlarged schematic view of portion c of FIG. 8;

FIG. 10 is a schematic structural view of a pole assembly according to an embodiment of the present utility model;

FIG. 11 is a cross-sectional view of a cover plate assembly according to an embodiment of the present utility model;

FIG. 12 is a schematic view of the structure of a cover plate according to an embodiment of the present utility model;

fig. 13 is an enlarged schematic view of the portion d in fig. 12.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the embodiments of the present utility model and are not to be construed as limiting the embodiments of the present utility model.

In an embodiment of the utility model, a first feature "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different embodiments, or examples, for implementing different structures of embodiments of the utility model. In order to simplify the disclosure of embodiments of the present utility model, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Embodiments of the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and do not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, embodiments of the present utility model provide examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

Referring to fig. 1 to 4, a cover assembly 100 according to an embodiment of the present utility model includes a cover 10, a post assembly 12 and a seal ring 14. The cover plate 10 is provided with a first through hole 16, the pole assembly 12 penetrates through the first through hole 16, the pole assembly 12 is provided with a step sealing part 18, the sealing ring 14 is clamped between the cover plate 10 and the step sealing part 18, the outer periphery of the sealing ring 14 is provided with an outer boss 20, and the outer boss 20 is at least partially mutually embedded and sealed with the step sealing part 18.

In the cover plate assembly 100, the outer protrusion 20 at the outer periphery of the sealing ring 14 is at least partially engaged with the step sealing portion 18 of the pole assembly 12, so that the gap between the pole assembly 12 and the cover plate 10 after the sealing ring 14 is compressed is reduced, the risk of high-voltage conduction between the pole assembly 12 and the cover plate 10 is reduced, and further the risk of electrical property runaway of the battery is reduced.

Specifically, the cover plate assembly 100 includes a cover plate 10, a pole assembly 12 and a sealing ring 14, the cover plate 10 is provided with a first through hole 16, the pole assembly 12 is penetrated through the first through hole 16, an outer boss 20 is arranged at the outer periphery of the sealing ring 14, the pole assembly 12 is provided with a step sealing part 18, and the sealing ring 14 is clamped between the cover plate 10 and the step sealing part 18. In one example, the material of the sealing ring 14 may be fluororubber, or the material of the sealing ring 14 may be nitrile rubber, ethylene propylene rubber, or other materials of the sealing ring 14 according to requirements. The outer boss 20 of the sealing ring 14 is at least partially embedded and sealed with the step sealing part 18, so that the gap between the post assembly 12 and the cover plate 10 after the sealing ring 14 is compressed is reduced, the risk of high-voltage conduction between the post assembly 12 and the cover plate 10 is reduced, and further the risk of electrical property runaway of the battery is reduced.

In the whole compression process, the outer boss 20 does not play a compression role in axial compression, so that the compression width of the sealing ring 14 is reduced, the internal stress of the sealing ring 14 after compression is reduced, the acting force of the sealing ring 14 on the cover plate 10 is also reduced, the stress deformation of the cover plate 10 is reduced, the compression amount of the sealing ring 14 is not qualified due to rebound after the cover plate 10 is prevented from being deformed, the tightness of a battery is influenced, and the risk of leakage of the battery can be prevented.

In some embodiments, the step seal 18 has a first inclined surface 22, the first inclined surface 22 being inclined away from the outer boss 20 in the axial direction of the first through hole 16, the outer boss 20 having a second inclined surface 24, the first inclined surface 22 being in mating engagement with the second inclined surface 24.

In this way, the first inclined surface 22 and the second inclined surface 24 are engaged with each other, so that the seal ring 14 and the step seal portion 18 can be fitted and sealed to each other.

Specifically, the step seal 18 has a first inclined surface 22, as shown in fig. 4, the step seal 18 has a stepped-down step structure, the first inclined surface 22 may be inclined obliquely downward, the outer boss 20 has a second inclined surface 24, the second inclined surface 24 may be inclined obliquely upward, and the second inclined surface 24 is cooperatively connected with the first inclined surface 22, so that the seal ring 14 and the step seal 18 are mutually engaged and sealed, thereby making the sealing effect better.

In some embodiments, the sealing ring 14 includes a supporting portion 26 and a penetrating portion 28, the supporting portion 26 is connected to the periphery of the penetrating portion 28, the outer boss 20 is disposed on the outer periphery of the supporting portion 26, the penetrating portion 28 penetrates through the first through hole 16, a groove 30 is disposed at a portion, opposite to the inner wall of the first through hole 16, of the penetrating portion 28, the cover plate assembly 100 includes an insulating member 32, the insulating member 32 is disposed on one side of the cover plate 10, a second through hole 34 aligned with the first through hole 16 is formed in the insulating member 32, a convex portion 36 is disposed at an edge of the second through hole 34, and the convex portion 36 is at least partially filled in the groove 30.

In this way, the inner wall of the first through hole 16 can be completely separated from the post 38, preventing the risk of short-circuiting.

Specifically, as shown in fig. 6 and 7, the sealing ring 14 includes a supporting portion 26 and a penetrating portion 28, the penetrating portion 28 penetrates the first through hole 16, a portion of the penetrating portion 28 opposite to the inner wall of the first through hole 16 is provided with a groove 30, the cover plate assembly 100 includes an insulating member 32, as shown in fig. 9 and 11, the insulating member 32 is mounted below the sealing ring 14, a second through hole 34 is provided in the insulating member 32, the second through hole 34 is aligned with the first through hole 16, a protrusion 36 is provided at an edge of the second through hole 34, and the protrusion 36 is partially filled in the groove 30 of the sealing ring 14. The groove 30 designed on the sealing ring 14 can effectively freely squeeze the penetrating part 28 of the sealing ring 14, and reduce the stress of the compressed part of the sealing ring 14 on the pole 38 and the cover plate 10.

The sealing ring 14 is sleeved on the pole column 38, the abutting part 26 of the sealing ring 14 is mutually embedded and hermetically connected with the step sealing part 18, the pole column 38 and the cover plate 10 are separated, after the sealing ring 14 is compressed, the pole column 38 and the cover plate 10 are fully filled, a vacuum state cannot occur, as shown in fig. 3, one surface of the pole column 38, which is close to the cover plate 10, cannot be in contact with the cover plate 10, and in a high-voltage state, the pole column 38 and the cover plate 10 are completely filled, cannot be broken down by high voltage, the short-circuit risk is prevented, the risk that the insulation voltage resistance of the battery assembly cannot reach the standard is avoided, and the risk that the battery is out of control.

In certain embodiments, both the recess 30 and the projection 36 are annular.

In this way, the insulator 32 and the seal ring 14 are assembled and sealed in accordance with the shape of the post 38, and the sealing effect can be ensured.

Specifically, the protrusion 36 is disposed on the insulating member 32, the groove 30 is disposed on the sealing ring 14, the assembled protrusion 36 is at least partially filled in the groove 30, the protrusion 36 and the groove 30 are both annular, the annular groove 30 is disposed on the contact surface of the sealing ring 14 and the insulating member 32, the annular protrusion 36 is disposed on the insulating member 32, the sealing ring 14 is sleeved on the pole 38 during assembly, the protrusion 36 is partially filled in the groove 30, and the pole 38 can be completely isolated from the external cover plate 10, so that the sealing effect is ensured. At the same time, annular projection 36 and recess 30 are easier to machine when sealing ring 14 and insulator 32 are machined.

In some embodiments, referring to fig. 10, the pole assembly 12 includes a pole 38, the pole 38 includes a first connecting portion 40 and a second connecting portion 42, the first connecting portion 40 is connected to a top end of the second connecting portion 42, the second connecting portion 42 penetrates the first through hole 16, and the second connecting portion 42 is separated from a hole wall of the first through hole 16 by the penetrating portion 28 and the protruding portion 36.

In this way, by separating the penetrating portion 28 and the protruding portion 36 from the wall of the second connecting portion 42 and the first through hole 16, the risk of occurrence of a short circuit can be prevented.

Specifically, the protruding portion 36 of the insulating member 32 is partially filled in the groove 30 of the sealing ring 14 to separate the second connecting portion 42 from the hole wall of the first through hole 16, thereby completely separating the cover plate 10 and the pole 38, forming a staggered arrangement between the sealing ring 14 and the insulating member 32 at the second connecting portion 42 and the hole wall of the first through hole 16, and solving the insulation and voltage resistance problem of the cover plate 10 and the pole 38.

In some embodiments, referring to fig. 10, the pole assembly 12 includes a plastic member 44 and a fixing member 46, the plastic member 44 covers the outer periphery of the first connecting portion 40, the plastic member 44 has a step sealing portion 18, the step sealing portion 18 is located on the bottom surface of the first connecting portion 40, and the fixing member 46 fixedly connects the plastic member 44 and the cover plate 10.

In this way, the pole 38 is fixedly connected to the cover plate 10.

Specifically, the pole assembly 12 includes a plastic member 44 and a fixing member 46, where the plastic member 44 wraps the outer periphery of the first connection portion 40 and a portion of the fixing member 46, and the fixing member 46 is partially received on the cover plate 10 and is fixedly connected with the cover plate 10, and the fixing member 46 may be a fixing disc, and in one embodiment, the fixing member 46 is fixedly connected with the cover plate 10 by means of laser welding, so that the pole 38 is fixedly connected with the cover plate 10, and also plays a role of secondary sealing at the welding position. In other embodiments, the attachment of the fixing member 46 to the cover plate 10 may be by adhesive bonding or other fastening means. In one embodiment, the plastic member 44 is integrally formed by an injection molding process and fixedly coupled to the fixing member 46 and the first coupling portion 40. The fixed plastic member 44 has a "U" shaped slot formed therein in which the post 38 is partially received, as shown in FIG. 10, to prevent cracking between the post 38 and the plastic member 44, or misalignment in the vertical direction, thereby affecting the strength of the plastic member 44. In other embodiments, other processing options may be selected for the processing of plastic 44.

In some embodiments, referring to fig. 1 and 11, the cover assembly 100 includes the extracting member 48, the top surface of the extracting member 48 is convexly provided with a third connecting portion 50, the third connecting portion 50 is connected to the pole 38, the extracting member 48 is separated from the cover 10 by the insulating member 32, and the third connecting portion 50 is separated from the inner wall of the first through hole 16 by the protruding portion 36.

In this way, the drawer 48 can be prevented from contacting the cover plate 10.

Specifically, the cover plate assembly 100 includes the lead-out member 48, the top surface of the lead-out member 48 is provided with a third connecting portion 50, the third connecting portion 50 is used for being connected with the pole 38, the third connecting portion 50 penetrates through the second through hole 34 and is separated from the cover plate 10 by the insulating member 32, and the third connecting portion 50 is separated from the inner wall of the first through hole 16 by the protruding portion 36, so that the lead-out member 48 is completely separated from the cover plate 10 by the insulating member 32, and short circuit risks are prevented.

In some embodiments, referring to fig. 12 and 13, the cover plate 10 is provided with a receiving groove 52, the first through hole 16 is formed on a bottom surface of the receiving groove 52, and the pole assembly 12 is partially received in the receiving groove 52.

In this way, the positioning is easy during the assembly, and meanwhile, the pole assembly 12 is partially accommodated in the accommodating groove 52, so that the overall structure of the cover plate assembly 100 is more compact and stable.

Specifically, the cover plate 10 is provided with a receiving groove 52, and the fixing member 46 is partially received in the receiving groove 52. The first through hole 16 is formed in the bottom surface of the accommodating groove 52, the pole 38 passes through the first through hole 16, as shown in fig. 11, the plastic piece 44 wraps the pole 38 and the fixing piece 46 on the upper portion of the pole 38, and the fixing piece 46 is fixedly connected with the contact portion of the accommodating groove 52, so that the fixed connection of the plastic piece 44, the fixing piece 46 and the pole 38 is realized, and meanwhile, a certain sealing effect can be achieved. In the illustrated embodiment, the cover plate 10 is an aluminum stamped structural member, which is easily stamped and formed and has high strength. In other embodiments, the material and processing manner of the cover plate 10 may be selected according to specific requirements.

In summary, the sealing ring 14 is sleeved on the second connecting portion 42, the penetrating portion 28 of the sealing ring 14 separates the second connecting portion 42 from the side wall of the first through hole 16, the abutting portion 26 separates the bottom surface of the first connecting portion 40 from the bottom of the accommodating groove 52 of the cover plate 10, then the cover plate 10 is fixed, a certain external force is applied to the upper surface of the pole 38, so that the pole 38, the sealing ring 14 and the cover plate 10 are compressed, and finally the sealing ring 14 is compressed to a certain height between the pole 38 and the cover plate 10, and then the fixing piece 46 is fixedly connected with the cover plate 10, so that the pole assembly 12, the sealing ring 14 and the cover plate 10 form an integral assembly, the sealing ring 14 plays a role in fixing the pole 38 after the fixed contact portion between the fixing space and the accommodating groove 52 is fixedly connected, and also has a certain sealing effect.

By controlling the overall height of the step seal 18, the maximum compression amount of the seal ring 14 after being compressed (i.e., the minimum thickness of the seal ring 14 after being compressed) can be controlled, so that the seal ring 14 is prevented from being compressed too much by external force and exceeding the internal performance requirement, and the seal ring 14 is prevented from being damaged, thereby reducing the stability of the seal ring 14 and shortening the service life of the seal ring 14. With the high design, the compression performance of the sealing ring 14 can be fully utilized, so that the performance of the sealing ring 14 is more stable.

After the sealing ring 14 is compressed, the compression amount is stable, the rebound is reduced, so that the risk of battery leakage is reduced, the problem of insulation and pressure resistance is improved, the failure of the electrical performance of the battery in the use process is avoided, and the tightness and the insulation and pressure resistance of the cover plate assembly 100 in the whole power battery are optimally improved.

A battery of an embodiment of the present utility model includes the cap plate assembly 100 of any of the embodiments described above.

The electric equipment comprises the battery of the embodiment.

According to the battery and the electric equipment, through the design of the structure of the cover plate assembly 100, the outer boss 20 at the outer periphery of the sealing ring 14 is at least partially embedded and sealed with the step sealing part 18 of the pole assembly 12, so that the gap between the pole assembly 12 and the cover plate 10 after the sealing ring 14 is compressed is reduced, the risk of high-voltage conduction between the pole assembly 12 and the cover plate 10 is reduced, the tightness and the insulation pressure resistance of the assembly in the whole power battery are optimally improved, the failure of the electrical performance of the battery in the use process is avoided, and the safety of the battery in the use process is ensured.

In particular, the powered device may include an energy storage device, a vehicle, an unmanned aerial vehicle, and the like. Vehicles include, but are not limited to, electric-only vehicles, hybrid vehicles, extended range electric vehicles, and the like.

In the description of the present specification, reference is made to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., meaning that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims

1. A cover plate assembly, comprising:

the cover plate is provided with a first through hole;

2. The cover plate assembly of claim 1, wherein the step seal has a first inclined surface inclined away from the direction along the first through hole axis toward the outer boss, the outer boss has a second inclined surface, and the first inclined surface is cooperatively connected with the second inclined surface.

3. The cover plate assembly according to claim 1, wherein the sealing ring comprises a supporting portion and a penetrating portion, the supporting portion is connected to the periphery of the penetrating portion, the outer boss is arranged on the outer periphery of the supporting portion, the penetrating portion penetrates through the first through hole, and a groove is formed in a portion, opposite to the inner wall of the first through hole, of the penetrating portion;

4. A cover plate assembly according to claim 3, wherein the recess and the projection are each annular.

5. The cover plate assembly of claim 3, wherein the post assembly comprises a post, the post comprises a first connecting portion and a second connecting portion, the first connecting portion is connected to the top end of the second connecting portion, the second connecting portion is penetrated by the first through hole, and the walls of the second connecting portion and the first through hole are separated by the penetrating portion and the protruding portion.

6. The cover plate assembly of claim 5, wherein the post assembly comprises:

7. The cover plate assembly according to claim 5, wherein the cover plate assembly comprises a lead-out member, a third connecting portion is convexly arranged on the top surface of the lead-out member and connected with the pole, the lead-out member and the cover plate are separated by the insulating member, and the third connecting portion and the inner wall of the first through hole are separated by the convex portion.

8. The cover plate assembly according to claim 1, wherein the cover plate is provided with a containing groove, the first through hole is formed in the bottom surface of the containing groove, and the pole assembly is partially contained in the containing groove.

9. A battery comprising the cap plate assembly of any one of claims 1-8.

10. A powered device comprising the battery of claim 9.