Sealing rubber pin, battery cover plate, battery, and energy storage device

Abstract

The present application relates to the technical field of batteries. Disclosed are a sealing rubber pin, a battery cover plate, a battery and an energy storage device. The sealing rubber pin comprises a head part (1) and a sealing part (2), wherein a first limiting part and a second limiting part that protrude in the radial direction of the sealing rubber pin are provided on the sealing part (2), the first limiting part is located at the end of the sealing part (2) close to the head part (1), the second limiting part is located at the end of the sealing part (2) distant from the head part (1), and the diameter of the sealing part (2) is greater than that of an electrolyte injection hole in the battery cover plate. The sealing rubber pin has a good sealing effect, thereby avoiding the risk of electrolyte leakage in the battery, and ensuring the stability and reliability of the battery.

Description

Sealant nails, battery covers, batteries and energy storage devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number CN202323069338.6 filed with the Patent Office of China on November 13, 2023, entitled “Sealing nails, battery cover, battery and energy storage device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a sealing nail, a battery cover, a battery, and an energy storage device. Background Art

[0004] As lithium-ion battery technology matures, it is widely used as a power battery in electric vehicles and energy storage. Simultaneously, people have increasing expectations for the performance and safety of lithium-ion batteries. Currently, after liquid injection (primarily post-formation liquid injection), traditional single-cell batteries are typically sealed by driving a sealing nail into the injection hole. The sealing nail cap is then installed and welded to the top cover for resealing.

[0005] However, in the existing technology, the pressure between the sealing nail and the liquid filling port on the plain aluminum plate is small, that is, the compression ratio is small, resulting in an inability to achieve a good sealing effect. There is a risk of leakage, that is, the risk of corroding the battery, thereby reducing the battery life and causing battery safety problems.

[0006] Application Contents

[0007] In view of this, the present application proposes a sealing nail, a battery cover, and a battery and energy storage device to improve the sealing reliability.

[0008] In a first aspect, the present application provides a sealing nail, wherein the sealing nail is made of fluororubber material and comprises a head and a sealing portion;

[0009] The sealing portion is provided with a first limiting portion and a second limiting portion protruding radially along the sealing nail, the first limiting portion is located at an end of the sealing portion close to the head, and the second limiting portion is located at an end of the sealing portion away from the head, and the diameter of the sealing portion is larger than the diameter of the liquid injection hole on the battery cover.

[0010] Beneficial effect: By setting the diameter of the sealing part larger than the diameter of the liquid injection hole on the battery cover, an interference fit with the liquid injection hole can be achieved, thereby improving the radial sealing ability. At the same time, the first limiting part and the second limiting part also improve the axial sealing ability of the liquid injection hole due to volume expansion, thereby improving the reliability of the sealing of the liquid injection hole, thereby avoiding the risk of battery leakage and ensuring the stability and reliability of the battery.

[0011] In an optional embodiment, the first limiting portion includes a plurality of limiting protrusions provided on the sealing portion, and the plurality of limiting protrusions are arranged at intervals around the axial direction of the sealing nail; and / or the second limiting portion includes a limiting boss provided on the sealing portion, and the limiting boss is arranged to extend axially around the sealing nail.

[0012] Beneficial effects: The coordinated arrangement of multiple limiting protrusions and limiting bosses has a simple structure and is easy to manufacture.

[0013] In an optional embodiment, the head is provided with a plurality of removal portions arranged axially at intervals around the sealing nail, and a guide rib is formed between two adjacent removal portions, each of the guide ribs is used to guide the head to embed into the injection hole, and the plurality of guide ribs correspond one-to-one to the plurality of limiting protrusions.

[0014] Beneficial effects: The setting of the material removal part is conducive to the helium injection operation into the injection hole after pre-pressing the sealing nail. At the same time, the setting of the guide rib is conducive to improving the convenience of embedding the sealing nail into the injection hole and reducing the difficulty of the sealing nail operation.

[0015] In an optional embodiment, there is a smooth transition between the guide rib and the corresponding limiting protrusion; and / or the surface of the removal portion is a flat section.

[0016] Beneficial effects: The smooth transition between the guide rib and the corresponding limiting protrusion is conducive to further improving the convenience of embedding the sealing nail into the injection hole, and the surface of the removed part is a flat section, which is conducive to forming a larger helium injection channel between the sealing nail and the injection hole after pre-compression.

[0017] In an optional embodiment, the cross section of the limiting boss is an inverted trapezoid.

[0018] Beneficial effect: The cross section of the limiting boss is an inverted trapezoid, which can prevent the sealing nail from falling into the battery, thereby achieving a more reliable use effect.

[0019] In an optional embodiment, the difference between the radial protrusion dimension of the limiting protrusion and the radius dimension of the sealing portion is between 0.05-0.3 mm.

[0020] Beneficial effect: The difference between the radial protrusion size of the limiting protrusion and the radius size of the sealing portion is between 0.05-0.3 mm, which helps to ensure the limiting effect of the limiting protrusion and prevent the sealing nail from slipping out of the injection hole.

[0021] In an optional embodiment, the head has an insertion end away from the sealing portion, the insertion end is used to be inserted into the liquid injection hole, and the insertion end is frustum-shaped; and / or the sealing nail is made of fluororubber.

[0022] Beneficial Effects: The frustum-shaped insertion end reduces the difficulty of pressing the sealant into the injection hole. Made of fluororubber, the sealant expands upon contact with the electrolyte, further enhancing the interference fit between the sealant and the injection hole, and thus improving radial sealing capabilities.

[0023] In a second aspect, the present application provides a battery cover, wherein the battery cover includes the sealing nails as described above.

[0024] In a third aspect, the present application provides a battery comprising the above-mentioned battery cover.

[0025] In a fourth aspect, the present application provides an energy storage device, in which the above-mentioned battery is provided.

[0026] The battery cover, battery and energy storage device described in this application have the same beneficial effects as the above-mentioned sealing nails compared to the prior art, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] FIG1 is a schematic diagram of the overall structure of the sealing nail according to an embodiment of the present invention;

[0029] Figures 2 and 3 are schematic structural diagrams of the structure shown in Figure 1 from other perspectives;

[0030] Description of reference numerals:

[0031] 1. Head; 11. Material removal part; 12. Guide rib; 13. Insertion end;

[0032] 2. Sealing part; 21. Limiting protrusion; 22. Limiting boss. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0034] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0035] Example 1

[0036] This embodiment relates to a sealing nail, which can not only form a good sealing effect on the liquid injection hole, but also reduce the difficulty of pressing the nail into the liquid injection hole, and has high practicality.

[0037] In terms of overall structure, as shown in FIG. 1 to FIG. 3 , the sealing nail of this embodiment is made of fluororubber, and includes a head 1 and a sealing portion 2 .

[0038] Among them, the sealing part 2 is provided with a first limiting part and a second limiting part protruding radially along the sealing nail. The first limiting part is located at the end of the sealing part 2 close to the head 1, and the second limiting part is located at the end of the sealing part 2 away from the head 1, and the diameter of the sealing part 2 is larger than the diameter of the liquid injection hole on the battery cover.

[0039] Specifically, in this embodiment, as an exemplary structure, the first limiting portion includes a plurality of limiting protrusions 21 provided on the sealing portion 2, and the plurality of limiting protrusions 21 are arranged at intervals around the axial direction of the sealing nail. Simultaneously, the second limiting portion includes a limiting boss 22 provided on the sealing portion 2, and the limiting boss 22 is arranged to extend axially around the sealing nail.

[0040] Here, the combination of multiple limiting protrusions 21 and limiting bosses 22 is simple in structure and easy to manufacture. In practice, preferably three limiting protrusions 21 are provided to facilitate the sealing portion 2 to be embedded in the injection hole while stably limiting the sealing nail in the injection hole.

[0041] Of course, the number and arrangement of the limiting protrusions 21 can also be set and adjusted accordingly according to actual limiting requirements. For example, they can be specifically set to two, four or five, etc., arranged axially around the sealing nail.

[0042] 1 and 2 , as a preferred embodiment, the head 1 of this embodiment is provided with a plurality of removal portions 11 arranged axially at intervals around the sealing nail, and a guide rib 12 is formed between two adjacent removal portions 11, each guide rib 12 is used to guide the head 1 to be embedded in the liquid injection hole, and the plurality of guide ribs 12 correspond one-to-one to the plurality of limiting protrusions 21.

[0043] It can be understood that the setting of the removal portion 11 can form a helium injection channel between the pre-pressed sealing nail and the injection hole, which is conducive to the helium injection operation into the injection hole. At the same time, the setting of the guide rib 12 is conducive to improving the convenience of embedding the sealing nail into the injection hole and reducing the difficulty of the sealing nail operation.

[0044] In specific implementation, as a preferred implementation form, in this embodiment, still referring to Figure 2, the smooth transition between the guide rib 12 and the corresponding limiting protrusion 21 can ensure the smoothness of the sealing nail being pressed into the injection hole from the head 1 to the sealing part 2, which is conducive to further improving the convenience of embedding the sealing nail into the injection hole.

[0045] At the same time, as a preferred implementation form, in this embodiment, the surface of the removal portion 11 is a flat section, so as to form a larger helium injection channel between the sealing nail and the injection hole after pre-compression, thereby facilitating the helium injection operation.

[0046] In addition, in this embodiment, as a preferred implementation form, the cross section of the limiting boss 22 is an inverted trapezoid, which can prevent the sealing nail from falling into the interior of the battery, thereby achieving a more reliable use effect.

[0047] Furthermore, as a preferred embodiment, the difference between the radial protrusion size of the limiting protrusion 21 and the radius size of the sealing portion 2 in this embodiment is between 0.05-0.3 mm. Such a setting helps to ensure the limiting effect of the limiting protrusion 21 and prevent the sealing nail from slipping out of the injection hole.

[0048] During specific setting, the above difference can be set and adjusted accordingly according to the actual axial sealing effect of the sealing nail and the convenience of pressing in, for example, it can be 0.05mm, 0.1mm, or 0.2mm.

[0049] Continuing with Figures 1 to 3 , as a preferred embodiment, the head 1 has an insertion end 13, distal from the sealing portion 2, for insertion into the injection hole. The insertion end 13 is truncated and conical in shape. This reduces the difficulty of pressing the sealant into the injection hole and improves the practicality of the sealant.

[0050] The sealing nail of this embodiment realizes an interference fit with the liquid injection hole by setting the diameter of the sealing part 2 larger than the diameter of the liquid injection hole on the battery cover, and utilizes the volume expansion characteristic of the fluororubber material after contact with the electrolyte, thereby improving the radial sealing ability. At the same time, the first limiting part and the second limiting part also improve the axial sealing ability of the liquid injection hole due to the volume expansion, thereby improving the reliability of the sealing of the liquid injection hole, thereby avoiding the risk of battery leakage and ensuring the stability and reliability of the battery.

[0051] Example 2

[0052] This embodiment relates to a battery cover plate, which includes the sealing nails in Example 1. At the same time, this embodiment also relates to a battery equipped with the battery cover plate, and an energy storage device equipped with the battery.

[0053] The battery cover, battery and energy storage device of this embodiment, by configuring the sealing nails in Example 1, can not only improve the convenience of pressing the sealing nails into the injection hole, but also improve the sealing of the injection hole, avoid the risk of leakage, and thus effectively improve safety performance.

[0054] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims. Industrial Applicability

[0055] By setting the diameter of the sealing part to be larger than the diameter of the injection hole on the battery cover, an interference fit with the injection hole can be achieved, thereby improving the radial sealing capability. At the same time, the first limiting part and the second limiting part also improve the axial sealing capability of the injection hole due to volume expansion, thereby improving the reliability of the sealing of the injection hole, thereby avoiding the risk of battery leakage and ensuring the stability and reliability of the battery.

Claims

1. A sealing nail, characterized by: The sealing nail comprises a head and a sealing part; The sealing portion is provided with a first limiting portion and a second limiting portion which protrude radially along the sealing nail, the first limiting portion is located at an end of the sealing portion close to the head, the second limiting portion is located at an end of the sealing portion away from the head, and the diameter of the sealing portion is larger than the diameter of the injection hole on the battery cover.

2. The sealing nail according to claim 1, characterized in that: The first limiting portion includes a plurality of limiting protrusions provided on the sealing portion, wherein the plurality of limiting protrusions are arranged at intervals around the axial direction of the sealing nail; and / or, The second limiting portion includes a limiting boss provided on the sealing portion, and the limiting boss is arranged to extend axially around the sealing nail.

3. The sealing nail according to claim 2, characterized in that: The head is provided with a plurality of removal portions which are arranged axially at intervals around the sealing nail, and a guide rib is formed between two adjacent removal portions, each of the guide ribs is used to guide the head to be embedded in the injection hole, and the plurality of guide ribs correspond one-to-one to the plurality of limiting protrusions.

4. The sealing nail according to claim 3, characterized in that: There is a smooth transition between the guide rib and the corresponding limiting protrusion; and / or, the surface of the material removal portion is a flat section.

5. The sealing nail according to claim 2, characterized in that: The cross section of the limiting boss is an inverted trapezoid.

6. The sealing nail according to claim 2, characterized in that: The difference between the radial protrusion dimension of the limiting protrusion and the radius dimension of the sealing portion is between 0.05-0.3 mm.

7. The sealing nail according to any one of claims 1 to 6, characterized in that: The head has an insertion end away from the sealing portion, the insertion end is used to be inserted into the injection hole, and the insertion end is in a truncated cone shape; and / or, The sealing nail is made of fluororubber.

8. A battery cover, characterized in that: The battery cover plate includes the sealing glue nail according to any one of claims 1 to 7.

9. A battery, characterized in that: Including the battery cover plate as claimed in claim 8.

10. An energy storage device, characterized in that: The energy storage device is provided with the battery described in claim 9.

Images