Top cover assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a top cover assembly and a battery. The top cover assembly comprises a cover plate, a pole and a sealing ring, and a first mounting hole is formed in the cover plate; the polar column comprises a column body and a substrate, one end of the column body is connected to the substrate, the other end of the column body penetrates through the first mounting hole, an annular groove is formed in the surface, facing the cover plate, of the substrate, and a clamping groove is inwards formed in the side wall of the annular groove; the cylinder is sleeved with the sealing ring, the sealing ring comprises a sealing ring body, a flange part and a clamping part, the flange part is arranged on the face, facing the base plate, of the sealing ring body in a protruding mode, the flange part is embedded in the annular groove, the clamping part is arranged on the side, facing the clamping groove, of the flange part in a protruding mode, and the clamping part is embedded in the clamping groove in a limited mode. Through the arrangement of the clamping part and the clamping groove, the clamping groove can limit the movement of the clamping part, and the connection stability of the sealing ring on the pole is enhanced, so that the possibility that the sealing ring slips along the pole body to cause the failure of the sealing performance is thoroughly eliminated, and the use safety and reliability of the battery are further improved.

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 various fields due to their advantages such as high energy density and long life. The top cover is one of the important components of lithium batteries, and its sealing performance will directly affect the safety factor of the entire lithium battery. If the top cover seal of the lithium battery fails, it will cause the risk of internal battery leakage, short circuit, fire or even explosion.

[0003] Currently, the sealing performance of lithium battery top covers is mainly guaranteed by compressing the sealing rings on the poles or plates. To reduce the possibility of sealing ring failure, existing related technologies provide a power battery top cover in which the sealing ring is provided with a first boss. The first boss can enhance the reliability and stability of the connection between the sealing ring and the cover plate, preventing the sealing ring from slipping when the pole and the cover plate are riveted. However, during the operation of the lithium battery, when the pressure between the pole and the cover plate changes significantly, the pressing force of the cover plate on the sealing ring will decrease, resulting in insufficient pressing force of the sealing ring and loosening. Therefore, existing related technologies still cannot eliminate the risk of sealing ring failure.

[0004] Based on the above, there is an urgent need for a top cover assembly and a battery to solve the problems existing in the existing related technologies. Utility Model Content

[0005] The first object of the present utility model is to provide a top cover assembly that can completely eliminate the possibility of failure of the sealing performance of the sealing ring.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Top cover assembly, including:

[0008] A cover plate, wherein a first mounting hole is formed on the cover plate;

[0009] A pole, comprising a column and a base plate, one end of the column being connected to the base plate, the other end of the column being passed through the first mounting hole, an annular groove being formed on a side of the base plate facing the cover plate, and a slot being formed inwardly on a side wall of the annular groove;

[0010] The sealing ring is sleeved on the column and includes a sealing ring body, a flange portion and a clamping portion. The sealing ring body is provided with the flange portion on a side facing the substrate, the flange portion is embedded in the annular groove, and the flange portion is provided with the clamping portion on a side facing the clamping groove, and the clamping portion is limitedly embedded in the clamping groove.

[0011] Preferably, the vertical cross-section of the clamping portion is triangular, and a straight side of the clamping portion is connected to the flange portion;

[0012] Furthermore, the vertical cross-section of the card slot is triangular, and the card slot is cooperatively connected to the card connection portion.

[0013] Preferably, a straight side of the clamping portion is connected to the flange portion, and a length of the straight side of the clamping portion is the same as a length of a side wall of the flange portion, so that the straight side of the clamping portion abuts against the surface of the sealing ring body at an end.

[0014] Preferably, the inclination angle between the oblique side of the clamping portion and the other straight side of the clamping portion is a, and a satisfies: 39°<a<76°.

[0015] Preferably, the horizontal projection length of the hypotenuse of the clamping portion is L, and 0.1mm≤L≤0.5mm.

[0016] Preferably, the clamping portion is an annular structure;

[0017] Furthermore, the horizontal cross section of the slot is annular.

[0018] Preferably, a plurality of the clamping portions are protruded on the flange portion at equal intervals around the axis of the column;

[0019] Around the axis of the column, a plurality of clamping grooves are formed on the side wall of the annular groove at equal intervals, and the clamping grooves are arranged in a one-to-one correspondence with the clamping portion.

[0020] Preferably, the sealing ring body, the flange portion and the clamping portion are integrally formed by an injection molding process.

[0021] Preferably, the horizontal cross-section of the pole is circular, and along the radial direction of the pole, the clamping groove is opened on the side wall of the annular groove away from the column.

[0022] A second object of the present invention is to provide a battery, which can effectively improve the safety and reliability of the battery by using the above-mentioned top cover assembly in the battery.

[0023] To achieve this purpose, the present invention adopts the following technical solutions:

[0024] The battery comprises a shell, a single cell and the above-mentioned top cover assembly, wherein the shell is provided with an opening, the single cell is accommodated in the shell, and the sealing cover of the top cover assembly is provided at the opening.

[0025] Beneficial effects of the utility model:

[0026] This embodiment provides a top cover assembly, wherein the sealing ring of the top cover assembly has a protruding engaging portion on the side of the flange portion facing the slot. During the process of the flange portion being embedded in the annular groove, the engaging portion can undergo elastic deformation and slide along the sidewall of the annular groove. After the flange portion is embedded in the annular groove, the engaging portion can elastically return to its original position and be embedded in the slot. The arrangement of the engaging portion and the slot allows the slot to limit the movement of the engaging portion, thereby strengthening the connection stability of the sealing ring to the pole, thereby completely eliminating the possibility of the sealing ring slipping along the pole body and causing sealing failure.

[0027] This embodiment also provides a battery. Since the above-mentioned top cover assembly is provided in the battery, the installation stability of the sealing ring of the battery is greatly enhanced, eliminating the possibility of the sealing performance failure of the sealing ring, thereby improving the safety and reliability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of a top cover assembly provided by an embodiment of the present utility model;

[0029] Figure 2 This is an exploded view of the top cover assembly provided by an embodiment of the present utility model;

[0030] Figure 3 is a top view of the top cover assembly provided by an embodiment of the present utility model;

[0031] Figure 4 yes Figure 3 Cross-sectional view along the middle line AA;

[0032] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0033] Figure 6 It is a cross-sectional view of the sealing ring provided in the embodiment of the utility model.

[0034] In the picture:

[0035] 1. Cover plate; 11. First mounting hole; 12. Liquid injection hole;

[0036] 2. Pole; 21. Column; 211. Annular protrusion; 22. Base plate; 221. Annular groove; 222. Slot;

[0037] 3. Sealing ring; 31. Sealing ring body; 32. Flange portion; 321. Clamping portion;

[0038] 4. Upper plastic part; 41. Second mounting hole; 42. Limiting groove;

[0039] 5. Remove the plastic parts;

[0040] 6. Explosion-proof valve. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0042] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0043] In the present invention, unless otherwise expressly specified or limited, a first feature being "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 being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0045] like Figure 1-Figure 5 As shown, this embodiment provides a top cover assembly for connecting to a housing containing a single battery cell to isolate the cell from the outside world. The top cover assembly primarily comprises a cover plate 1, a terminal 2, and a sealing ring 3. The cover plate 1 defines a first mounting hole 11, into which the sealing ring 3 is partially embedded. The terminal 2 partially passes through the first through-hole and is sealed and connected to the sealing ring 3, securing the terminal 2 to the cover plate 1.

[0046] Specifically, if Figure 5、 Figure 6 As shown, the pole 2 includes a column 21 and a base plate 22, one end of the column 21 is connected to the base plate 22, and the other end of the column 21 is passed through the first mounting hole 11. The base plate 22 is provided with an annular groove 221 on the side facing the cover plate 1; the sealing ring 3 is sleeved on the main body and includes a sealing ring body 31 and a flange portion 32. The sealing ring body 31 is provided with a flange portion 32 on the side facing the base plate 22, and the flange portion 32 is embedded in the annular groove 221.

[0047] The above arrangement can enhance the installation stability of the sealing ring 3. Specifically, when the pole 2 is not mounted on the cover plate 1 and the sealing ring 3 is sleeved on the pole 2, the flange portion 32 is loosely connected to the annular groove 221. When the pole 2 is riveted to the cover plate 1 and pressure is applied to the sealing ring 3 through the cover plate 1, the flange portion 32 of the sealing ring 3 is squeezed and expanded, thereby filling the gap between the flange portion 32 and the annular groove 221, so that the flange portion 32 is firmly embedded in the annular groove 221. This enhances the reliability and stability of the connection between the sealing ring 3 and the pole 2, and prevents the sealing ring 3 from slipping out of the first mounting hole 11 when the pole 2 and the cover plate 1 are riveted.

[0048] However, it should be noted that during the operation of the battery, when the pressure between the pole 2 and the cover 1 changes greatly, the pressing force of the cover 1 on the sealing ring 3 will become smaller, resulting in insufficient pressing force of the sealing ring 3 and the risk of loosening. Therefore, the performance of the sealing ring 3 will still fail, thereby affecting the safety of battery use.

[0049] To fundamentally address the above-mentioned technical drawbacks, the pole 2 provided in this embodiment has a snap-in groove 222 formed inwardly on the sidewall of the annular groove 221. In the sealing ring 3 provided in this embodiment, a snap-in portion 321 is provided protrudingly on the side of the flange 32 facing the snap-in groove 222. During the insertion of the flange 32 into the annular groove 221, the snap-in portion 321 is elastically deformed and slides along the sidewall of the annular groove 221. After the flange 32 is inserted into the annular groove 221, the snap-in portion 321 is elastically reset and retained within the snap-in groove 222. The provision of the snap-in portion 321 and the snap-in groove 222 allows the snap-in groove 222 to restrict the movement of the snap-in portion 321, thereby enhancing the connection stability of the sealing ring 3 to the pole 2 and completely eliminating the possibility of the sealing ring 3 slipping along the pole 21, causing the sealing performance to fail.

[0050] One of the specific implementations of this embodiment is that the horizontal cross-section of the pole 2 is circular to meet the actual working conditions. In addition, there are two poles 2, one of which is the positive pole and the other is the negative pole. The positive pole and the negative pole facilitate charging and discharging of the battery. The column 21 and the substrate 22 in the positive pole are made of metal aluminum and are integrally formed; the column 21 and the substrate 22 in the negative pole are respectively made of metal aluminum and metal copper, and the two are fixed by welding, bonding, etc., which is not limited in this embodiment. For the sake of convenience of description, the top cover assembly will be specifically introduced below using the positive pole as an example.

[0051] In this embodiment, the clamping portion 321 is annular in structure, and the horizontal cross-section of the clamping groove 222 is annular, so that the contact area between the sealing ring 3 and the substrate 22 in the vertical direction is increased, thereby improving the restraining effect of the substrate 22 on the sealing ring 3, making the sealing ring 3 more stable and meeting actual production requirements.

[0052] It is understood that in other parallel embodiments, a plurality of engaging portions 321 may be protruded at equal intervals on the flange portion 32 around the axis of the column 21, and a plurality of engaging grooves 222 may be formed at equal intervals on the sidewall of the annular groove 221, with the engaging grooves 222 corresponding one to one within the engaging portions 321. In this way, the contact area between the sealing ring 3 and the base plate 22 in the vertical direction may be increased, thereby improving the installation reliability of the sealing ring 3. Therefore, both of the above-mentioned implementations fall within the scope of protection of the present utility model.

[0053] Furthermore, in this embodiment, referring to Figure 6 As shown, the vertical cross-section of the clamping portion 321 is triangular, and a straight side of the clamping portion 321 is connected to the flange portion 32; the vertical cross-section of the clamping groove 222 is triangular, and the clamping groove 222 is cooperatively connected to the clamping portion 321. Through the above arrangement, the connection area between the clamping portion 321 and the flange portion 32 can be effectively increased, thereby improving the structural strength of the connection between the clamping portion 321 and the flange portion 32. In addition, in the radial direction, the thickness of the clamping portion 321 becomes thinner as it is farther away from the flange portion 32. In this way, when the flange portion 32 is embedded in the annular groove 221, the clamping portion 321 is more likely to undergo elastic deformation, ensuring that the flange portion 32 can be smoothly embedded in the annular groove 221, reducing obstacles to the installation of the sealing ring 3 on the base plate 22.

[0054] In this embodiment, the angle of inclination between the oblique side of the engaging portion 321 and the other straight side of the engaging portion 321 is set to be a, which is greater than 39° and less than 76°. For example, a is 40°, 45°, 50°, 55°, 60°, 65°, 70°, or 75°.

[0055] In this embodiment, the horizontal projection length of the hypotenuse of the engaging portion 321 is set to L, which is greater than or equal to 0.1 mm and less than or equal to 0.5 mm. For example, L is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm.

[0056] By setting the inclination angle between the hypotenuse of the clamping portion 321 and the other straight side of the clamping portion 321 and the horizontal projection length of the hypotenuse of the clamping portion 321 within the above-mentioned ranges, not only can the clamping portion 321 be prevented from being damaged and deformed due to being too thin during the process of embedding the flange portion 32 into the annular groove 221, but it can also ensure that the bonding surface area between the hypotenuse of the clamping portion 321 and the clamping groove 222 is sufficient to form an interlocking, thereby improving the fixing effect of the sealing ring 3 on the substrate 22.

[0057] Further preferably, in this embodiment, the length of a straight side of the clamping portion 321 is the same as the length of the side wall of the flange portion 32, so that a straight side of the clamping portion 321 abuts against the bottom surface of the sealing ring body 31 at the end, thereby contributing to the stability of the clamping portion 321 and facilitating the production of the sealing ring 3.

[0058] Furthermore, in this embodiment, the sealing ring body 31, the flange portion 32 and the clamping portion 321 are integrally formed by an injection molding process, which not only simplifies the production process, but also makes the overall sealing ring 3 structure more sturdy and durable, thereby ensuring the sealing performance of the sealing ring 3.

[0059] Further, continue to refer to Figure 6 As shown, in this embodiment, along the radial direction of the pole 2, the clamping groove 222 is opened on the side wall of the annular groove 221 away from the column 21, so that the clamping portion 321 can be arranged on the outer wall of the flange portion 32 instead of the inner wall, thereby facilitating the design and manufacturing of the clamping portion 321 and reducing the injection molding manufacturing pressure of the sealing ring 3.

[0060] Optionally, refer to Figure 5 As shown, the top cover assembly provided in this embodiment also includes an upper plastic part 4, a lower plastic part 5 and an explosion-proof valve 6, wherein the upper plastic part 4 is provided with a second mounting hole 41, and the column 21 passes through the first mounting hole 11 and the second mounting hole 41 and is sealed and connected to the sealing ring body 31 and the upper plastic part 4. Part of the lower plastic part 5 is clamped between the substrate 22 and the cover plate 1, so that the pole 2 and the cover plate 1 can be insulated and isolated to prevent battery leakage. The explosion-proof valve 6 is embedded in the cover plate 1. When thermal runaway occurs inside the battery, resulting in a large amount of heat, the explosion-proof valve 6 can explode open to release the pressure inside the battery, thereby protecting the top cover assembly from explosion due to excessive pressure inside the battery.

[0061] Further, in this embodiment, continue to refer to Figure 5As shown, an annular protrusion 211 is provided on the periphery of the column 21, and a limiting groove 42 is provided on the upper plastic part 4. The annular protrusion 211 is connected with the limiting groove 42 by interference fit. In this way, the interference fit connection between the annular protrusion 211 and the limiting groove 42 can improve the connection stability and reliability between the upper plastic part 4 and the pole 2, and avoid the risk of the upper plastic part 4 being separated from the pole 2 when the top cover assembly is working normally.

[0062] Furthermore, in this embodiment, a liquid injection hole 12 is further provided on the cover plate 1 , and the liquid injection hole 12 is used to inject electrolyte into the battery.

[0063] Another purpose of this embodiment is to provide a battery, which includes a shell, a single cell and the above-mentioned top cover assembly. The shell is provided with an opening, the single cell is accommodated in the shell, and the sealing cover of the top cover assembly is provided at the opening. It can be understood that the top cover assembly has a size and shape that matches the opening on the shell, thereby ensuring the stability and reliability of the connection between the top cover assembly and the shell. Since the sealing ring 3 of the above-mentioned top cover assembly is provided with a clamping portion 321, the clamping portion 321 is limited and clamped in the card slot 222, so that the card slot 222 can limit the movement of the clamping portion 321 in the vertical direction, thereby limiting the sealing ring 3 from being separated from the pole 2. By providing the above-mentioned top cover assembly in the battery, the installation stability of the sealing ring 3 of the battery is greatly enhanced, eliminating the possibility of failure of the sealing performance of the sealing ring 3, thereby improving the safety and reliability of the battery.

[0064] Throughout this specification, references to terms such as "some embodiments" and "other embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0065] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Top cover assembly, characterized in that, include: A cover plate (1), wherein a first mounting hole (11) is formed on the cover plate (1); A pole (2), the pole (2) comprising a column (21) and a base plate (22), one end of the column (21) being connected to the base plate (22), the other end of the column (21) being passed through the first mounting hole (11), an annular groove (221) being provided on a side of the base plate (22) facing the cover plate (1), and a clamping groove (222) being provided inwardly on a side wall of the annular groove (221); A sealing ring (3) is sleeved on the column (21) and comprises a sealing ring body (31), a flange portion (32) and a clamping portion (321). The sealing ring body (31) is provided with the flange portion (32) on one side facing the substrate (22). The flange portion (32) is embedded in the annular groove (221). The flange portion (32) is provided with the clamping portion (321) on one side facing the clamping groove (222). The clamping portion (321) is limitedly embedded in the clamping groove (222).

2. The top cover assembly according to claim 1, wherein: The vertical cross-section of the clamping portion (321) is triangular, and a straight side of the clamping portion (321) is connected to the flange portion (32); Furthermore, the vertical cross-section of the card slot (222) is triangular, and the card slot (222) is cooperatively connected to the card connection portion (321).

3. The top cover assembly according to claim 2, wherein: A straight side of the clamping portion (321) is connected to the flange portion (32), and the length of the straight side of the clamping portion (321) is the same as the length of the side wall of the flange portion (32), so that the straight side of the clamping portion (321) abuts against the surface of the sealing ring body (31) at the end.

4. The top cover assembly according to claim 2, wherein: The inclination angle between the oblique side of the clamping portion (321) and the other straight side of the clamping portion (321) is a, and a satisfies: 39°<a<76°.

5. The top cover assembly according to claim 4, wherein: The horizontal projection length of the hypotenuse of the clamping portion (321) is L, and 0.1 mm≤L≤0.5 mm.

6. The top cover assembly according to claim 1, wherein: The clamping portion (321) is an annular structure; Furthermore, the horizontal cross section of the slot (222) is annular.

7. The top cover assembly according to claim 1, wherein: A plurality of the clamping portions (321) are protruded on the flange portion (32) at equal intervals around the axis of the column (21); Around the axis of the column (21), a plurality of the clamping grooves (222) are evenly spaced on the side wall of the annular groove (221), and the clamping grooves (222) are arranged in a one-to-one correspondence with the clamping portion (321).

8. The top cover assembly according to claim 1, wherein: The sealing ring body (31), the flange portion (32) and the clamping portion (321) are integrally formed by an injection molding process.

9. The top cover assembly according to claim 8, wherein: The horizontal cross-section of the pole (2) is circular, and along the radial direction of the pole (2), the clamping groove (222) is opened on the side wall of the annular groove (221) away from the column (21).

10. A battery, characterized in that The invention comprises a shell, a single battery cell and a top cover assembly according to any one of claims 1 to 9, wherein the shell is provided with an opening, the single battery cell is accommodated in the shell, and the sealing cover of the top cover assembly is provided at the opening.

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