Sealing pin, battery packaging assembly, and battery

Abstract

The utility model discloses a kind of sealing nail, battery packaging assembly and battery, belong to battery technical field.The utility model's sealing nail, battery packaging assembly and battery, outer thread can be connected with the inner thread of injection hole with thread to close injection hole, to guarantee sealing property, to the electrolyte in electric core play protective effect;And outer thread and inner thread between still can form the air passage for gas passing, to make the helium in electric core can overflow through air passage, it is favorable to improve the accuracy of helium detection.Meanwhile, sealing element and rigid piece fixed connection, can avoid sealing element to appear drop, displacement etc. Problem, to be able to on the basis of guaranteeing sealing property, avoid sealing element to appear displacement or drop into electric core interior etc. Problem, it is favorable to improve the security of battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a sealing nail, a battery encapsulation component, and a battery. Background Technology

[0002] During battery production, the cells require multiple electrolyte injections and settling periods. After each injection, the injection port on the cover is typically sealed temporarily with adhesive pins to prevent moisture from the workshop environment from entering the cell and affecting the electrolyte and battery performance. After the injection process, an aluminum sheet is welded to the cover to seal the injection port. Following welding, the weld seal is tested using helium silicate detection.

[0003] However, existing adhesive pins are typically inserted into the injection hole using an interference fit, which makes it difficult for helium gas to escape from the cell, affecting the accuracy of helium detection. Furthermore, the adhesive pins may detach or shift, making them difficult to remove or reposition. If a pin falls into the cell, it can easily damage the cell's electrodes and even cause a safety accident. Utility Model Content

[0004] The purpose of this invention is to provide a sealing nail, a battery encapsulation component, and a battery that can improve the accuracy of helium detection and the safety of the battery.

[0005] To achieve the above objectives, firstly, the following technical solution is provided:

[0006] A sealing pin is used to seal the liquid injection hole on the battery cell cover. It includes a rigid component and a sealing component. The sealing component is fixedly connected to the rigid component. The sealing component is provided with an external thread. The external thread can be threadedly connected to the internal thread of the liquid injection hole to close the liquid injection hole. A gas passage can also be formed between the external thread and the internal thread to allow gas to pass through.

[0007] As a preferred technical solution for the aforementioned sealing nail, the rigid component includes:

[0008] A welding part, which can be welded to the cell cover to seal the liquid injection hole;

[0009] The nail tip is connected to one side of the welded part, and the seal covers the outside of the nail tip.

[0010] As a preferred technical solution for the aforementioned sealing nail, the rigid member further includes a columnar portion, which is connected between the nail tip and the welded portion. The nail tip has a conical structure, and the outer diameter of the large-diameter end of the nail tip is larger than the outer diameter of the columnar portion. The sealing member at least partially covers the outer side of the columnar portion.

[0011] As a preferred technical solution for the aforementioned sealing nail, one end of the sealing member is provided with a recessed mounting groove, and one end of the rigid member is inserted into and fixed in the mounting groove.

[0012] As a preferred technical solution for the aforementioned sealing nail, the sealing element includes a connecting portion and a covering portion. The connecting portion covers the outer side of the columnar portion, the external thread is provided on the connecting portion, and the covering portion covers the outer side of the nail tip.

[0013] The mounting groove is formed within the connecting portion and the covering portion.

[0014] As a preferred technical solution for the aforementioned sealing nail, an insulating component is provided below the battery cell cover, and the insulating component is provided with a through hole corresponding to the liquid injection hole;

[0015] The sealing element further includes a sealing structure that, when the external thread is threadedly connected to the internal thread of the battery cell cover to close the liquid injection hole of the battery cell cover, closes the through hole; when the air passage is formed between the external thread and the internal thread, the sealing structure opens the through hole.

[0016] As a preferred technical solution of the above-mentioned sealing nail, the sealing structure includes a boss, which protrudes between the connecting part and the covering part and can cover the end of the through hole near the battery cell cover to close the through hole; the boss can also elastically deform as the sealing nail moves so that the boss can be located at the end of the through hole away from the battery cell cover, and the boss is separated from the insulating component.

[0017] As a preferred embodiment of the sealing nail, the sealing nail further includes a magnetic element, which is fixed to the welding part, and the outer diameter of the magnetic element is smaller than the outer diameter of the welding part.

[0018] To achieve the above objectives, a second aspect also provides a battery packaging assembly, including a cell cover and a sealing pin as described in the first aspect above, wherein the cell cover has an injection hole and an internal thread that is threadedly connected to the external thread.

[0019] To achieve the above objectives, a third aspect also provides a battery, including a battery encapsulation assembly as described in the second aspect above.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] This invention relates to a sealing pin, a battery encapsulation assembly, and a battery. The external thread on the sealing element connects with the internal thread of the electrolyte injection hole to seal it, ensuring a tight seal and protecting the electrolyte within the cell. Furthermore, the external and internal threads form a gas passage, allowing helium gas inside the cell to escape, thus improving the accuracy of helium detection. Simultaneously, the sealing element is fixedly connected to a rigid component, preventing it from detaching or shifting. This ensures a tight seal while preventing displacement or the sealing element from falling into the cell, thereby enhancing battery safety. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the battery encapsulation assembly when the sealing structure closes the through hole in an embodiment of this utility model;

[0023] Figure 2 This is a cross-sectional view of the battery encapsulation assembly when the sealing structure opens the through hole in an embodiment of this utility model;

[0024] Figure 3 This is a schematic diagram of the first structure of the sealing nail in an embodiment of this utility model;

[0025] Figure 4 This is a schematic diagram of the second structure of the sealing nail in an embodiment of this utility model;

[0026] Figure 5 This is a cross-sectional view of the sealing nail in an embodiment of this utility model.

[0027] Figure label:

[0028] 1. Cell cover; 11. Injection hole; 2. Sealing nail; 21. Rigid component; 211. Welded part; 212. Nail tip; 213. Columnar part; 22. Sealing component; 221. Mounting groove; 222. Connecting part; 223. Covering part; 224. Boss; 23. Magnetic component; 3. Insulating component; 31. Through hole. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0036] like Figures 1 to 5 As shown, this embodiment provides a sealing nail, a battery encapsulation assembly, and a battery. The battery includes a cell body and a battery encapsulation assembly. The battery encapsulation assembly includes a cell cover 1 and a sealing nail 2. The cell cover 1 covers the opening of the cell body and has an injection hole 11. The sealing nail 2 is used to seal the injection hole 11 on the cell cover 1. The injection hole 11 has an internal thread.

[0037] The sealing pin 2 includes a rigid member 21 and a sealing member 22. The sealing member 22 is fixedly connected to the rigid member 21. The sealing member 22 is provided with an external thread. The external thread is threadedly connected to the internal thread of the injection hole 11 to close the injection hole 11. A gas passage for gas to pass through can be formed between the external thread and the internal thread.

[0038] In this embodiment, the sealing pin 2 has an external thread that can connect with the internal thread of the injection hole 11 to seal the injection hole 11, thereby ensuring a tight seal and preventing moisture in the air from entering the battery cell and affecting the electrolyte. This protects the electrolyte inside the battery cell. Furthermore, the external and internal threads form a gas passage, allowing helium gas inside the battery cell to escape, which improves the accuracy of helium detection. Simultaneously, the sealing pin 2 is installed using a threaded connection, facilitating quick assembly and disassembly, thus improving the convenience of multiple injection operations while ensuring a tight seal.

[0039] In this embodiment, the sealing nail 2 and the sealing element 22 are fixedly connected to the rigid element 21, which can prevent the sealing element 22 from falling off or shifting. This ensures the sealing performance and prevents the sealing element 22 from falling into the battery cell, thus improving the safety of the battery.

[0040] Optionally, the rigid component 21 includes a welded portion 211 and a nail tip 212. The welded portion 211 can be welded to the cell cover 1 to seal the injection hole 11. The nail tip 212 is connected to one side of the welded portion 211, and the sealing component 22 covers the outside of the nail tip 212. During the injection stage, the external thread of the sealing component 22 can be threaded to the internal thread of the injection hole 11, which seals the injection hole 11 to protect the electrolyte and facilitates the disassembly and assembly of the sealing nail 2, improving the convenience of multiple injection operations. After the injection process is completed, the welded portion 211 is welded to the cell cover 1, thereby sealing the injection hole 11. At this time, helium gas can escape through the gas passage between the external and internal threads, ensuring the accuracy of helium detection.

[0041] In other words, the rigid component 21 has a nail-like structure, which facilitates the insertion or removal of the sealing nail 2 from the injection hole 11. For example, the rigid component 21 is made of a metal material, such as aluminum, which can reduce costs and achieve lightweighting while meeting structural strength requirements.

[0042] For example, the seal 22 is made of fluororubber, silicone rubber, or epoxy resin, which can improve the sealing performance. Of course, the seal 22 can also be made of other materials that can achieve a seal, and this is not limited thereto.

[0043] For example, the seal 22 and the rigid member 21 are fixedly connected by adhesive, which not only ensures the reliability of the connection between the seal 22 and the rigid member 21, but also helps to reduce assembly difficulty and cost. Of course, the seal 22 and the rigid member 21 can also be fixedly connected by welding or other methods, and the seal 22 can also be fixedly connected to the rigid member 21 by casting molding, which is not limited here.

[0044] Optionally, the sealing nail 2 also includes a magnetic component 23, which is fixed to the welding part 211. The outer diameter of the magnetic component 23 is smaller than the outer diameter of the welding part 211. Magnetic components can be installed on assembly equipment such as robotic arms, and the magnetic components can be attracted and connected to the magnetic component 23. This allows the assembly equipment to drive the sealing nail 2 to perform insertion and removal actions, which not only improves insertion and removal efficiency and reduces the risk of cracking and breakage of the sealing nail 2, but also allows the sealing nail 2 to drive the cell cover 1 to rise and fall, so that the cell cover 1 can be assembled with the cell body.

[0045] For example, the magnetic component 23 is made of iron and is fixed to the welded part 211 by welding or gluing, so that the two are firmly connected and not easy to fall off.

[0046] Optionally, the magnetic element 23 has a disc-shaped structure, and the axis of the disc-shaped structure coincides with the axis of the sealing nail 2, which can improve the uniformity of the force on the sealing element 22, and is conducive to improving the sealing effect and the service life of the sealing element 22.

[0047] Optionally, the rigid member 21 further includes a columnar portion 213, which connects the nail tip 212 and the welded portion 211. The nail tip 212 has a conical structure, and the outer diameter of the large-diameter end of the nail tip 212 is larger than the outer diameter of the columnar portion 213. The sealing member 22 at least partially covers the outside of the columnar portion 213. It should be noted that a step can be formed between the nail tip 212 and the columnar portion 213. By having the sealing member 22 at least partially cover the outside of the columnar portion 213, the step can limit the sealing member 22, which helps to improve the stability of the connection between the sealing member 22 and the rigid member 21 and prevents the sealing member 22 from falling off and into the battery cell.

[0048] Optionally, one end of the seal 22 is provided with a recessed mounting groove 221, and one end of the rigid member 21 is inserted into and fixed in the mounting groove 221, thereby increasing the contact area between the seal 22 and the rigid member 21 and improving the stability of the connection between the seal 22 and the rigid member 21, and preventing the seal 22 from falling off and into the battery cell.

[0049] Optionally, the seal 22 includes a connecting portion 222 and a covering portion 223. The connecting portion 222 covers the outside of the columnar portion 213, and the external thread is provided on the connecting portion 222. The covering portion 223 covers the outside of the nail tip 212. Thus, the covering portion 223 can cover the nail tip 212 to prevent the nail tip 212 from being rubbed and generating foreign objects. It also facilitates the columnar portion 213 to provide stable support for the external thread, which is beneficial to improving the sealing performance between the external thread and the internal thread.

[0050] Furthermore, the connecting part 222 and the covering part 223 form a mounting groove 221, which can increase the depth of the mounting groove 221. In other words, both the connecting part 222 and the covering part 223 are connected to the rigid member 21, which helps to further improve the stability of the connection between the sealing member 22 and the rigid member 21.

[0051] Specifically, the covering part 223 has a conical structure, which allows the covering part 223 and the nail tip 212 to fit together more tightly. On the one hand, it improves the stability of the connection between the sealing element 22 and the rigid element 21, and on the other hand, it facilitates the quick and accurate insertion of the sealing nail 2 into the injection hole 11. It can reduce the requirements for the processing accuracy of the sealing nail 2 while ensuring the sealing performance, which is conducive to reducing costs.

[0052] Optionally, such as Figure 1 and Figure 2 As shown, an insulating component 3 is provided below the battery cell cover 1. The insulating component 3 has a through hole 31 corresponding to the liquid injection hole 11, which can improve the insulation of the battery cell cover 1. Specifically, the insulating component 3 is an insulating plate, which is made of plastic material.

[0053] Furthermore, the sealing element 22 also includes a sealing structure. When the external thread is threadedly connected to the internal thread of the battery cell cover 1 to close the liquid injection hole 11 of the battery cell cover 1, the sealing structure closes the through hole 31. By simultaneously closing the liquid injection hole 11 through the external and internal thread connection and closing the through hole 31 through the sealing structure, not only is the sealing effect improved, but the machining accuracy requirements for the sealing pin 2 are also reduced, which helps to lower costs. In other words, if the external and internal threads cannot completely close the liquid injection hole 11 due to machining errors, the through hole 31 can be closed through the sealing structure to ensure sealing performance. This allows the sealing structure to have a certain correction effect, thereby reducing the machining accuracy requirements for the sealing pin 2.

[0054] Furthermore, when a gas passage is formed between the external and internal threads, the sealing structure opens the through hole 31, thereby preventing the sealing structure from blocking the helium gas and improving the accuracy of helium detection.

[0055] Optionally, the sealing structure includes a boss 224, which surrounds the outer periphery of the connection between the connecting portion 222 and the covering portion 223. In other words, the boss 224 protrudes between the connecting portion 222 and the covering portion 223 and can cover the end of the through hole 31 near the cell cover 1 to close the through hole 31. The boss 224 can also elastically deform as the sealing pin 2 moves, so that the boss 224 can be located at the end of the through hole 31 away from the cell cover 1, and the boss 224 is separated from the insulating member 3. This configuration not only has a simple structure and good manufacturing process, which helps to reduce costs, but also improves the convenience of the sealing structure in closing and opening the through hole 31 and the convenience of battery assembly.

[0056] Specifically, before the welding part 211 is welded to the cell cover 1 to seal the injection hole 11, the cell cover 1 and the insulating member 3 are spaced apart. The injection hole 11 is closed by connecting the external thread and the internal thread, and the boss 224 is placed on the end of the through hole 31 near the cell cover 1 to close the through hole 31. That is, at this time, the injection hole 11 is sealed by the sealing member 22. When it is necessary to weld the welding part 211 to the cell cover 1, the cell cover 1 and the sealing pin 2 are pressed down, so that the cell cover 1 and the insulating member 3 can come into contact. During the downward movement of the sealing pin 2, the boss 224 will undergo elastic deformation as the sealing pin 2 moves, and then pass through the through hole 31 and be located at the end of the through hole 31 away from the cell cover 1. The boss 224 is separated from the insulating member 3, so that the through hole 31 is in an open state, and then the welding part 211 can be welded to the cell cover 1. After the welding part 211 is welded to the battery cell cover 1, helium gas can enter the injection hole 11 through the through hole 31, and then overflow through the gas passage between the external thread and the internal thread to improve the accuracy of helium detection.

[0057] It should be noted that before welding part 211 is welded to the cell cover 1, the external thread and internal thread are connected. Specifically, the protrusion of the external thread is located in the groove of the internal thread, and the protrusion of the internal thread is located in the groove of the external thread. When welding part 211 to cell cover 1 is required, the sealing pin 2 is pressed down, and the protrusions of the external thread and the internal thread are aligned, thereby forming an air passage between the external thread and the internal thread. The air passage has a large flow area, which facilitates the overflow of helium gas, thereby achieving the purpose of accurate helium detection.

[0058] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A sealing pin for sealing the liquid injection hole (11) on the battery cell cover (1), characterized in that, The sealing pin (2) includes a rigid member (21) and a sealing member (22). The sealing member (22) is fixedly connected to the rigid member (21). The sealing member (22) is provided with an external thread. The external thread can be threaded to the internal thread of the injection hole (11) to close the injection hole (11). A gas passage for gas to pass through can also be formed between the external thread and the internal thread.

2. The sealing nail according to claim 1, characterized in that, The rigid component (21) includes: A welding part (211) is capable of being welded to the battery cell cover (1) to seal the liquid injection hole (11); The nail tip (212) is connected to one side of the welded part (211), and the seal (22) covers the outside of the nail tip (212).

3. The sealing nail according to claim 2, characterized in that, The rigid member (21) further includes a columnar portion (213), which is connected between the nail tip (212) and the welded portion (211). The nail tip (212) has a conical structure, and the outer diameter of the large-diameter end of the nail tip (212) is larger than the outer diameter of the columnar portion (213). The sealing member (22) at least partially covers the outside of the columnar portion (213).

4. The sealing nail according to claim 3, characterized in that, One end of the sealing member (22) is provided with a recessed mounting groove (221), and one end of the rigid member (21) is inserted into and fixed in the mounting groove (221).

5. The sealing nail according to claim 4, characterized in that, The sealing element (22) includes a connecting part (222) and a covering part (223). The connecting part (222) covers the outside of the columnar part (213), and the external thread is provided on the connecting part (222). The covering part (223) covers the outside of the nail tip (212). The mounting groove (221) is formed within the connecting portion (222) and the covering portion (223).

6. The sealing nail according to claim 5, characterized in that, An insulating component (3) is provided below the battery cell cover (1), and the insulating component (3) is provided with a through hole (31) corresponding to the liquid injection hole (11); The sealing element (22) further includes a sealing structure that, when the external thread is threadedly connected to the internal thread of the battery cell cover (1) to close the liquid injection hole (11) of the battery cell cover (1), the sealing structure closes the through hole (31); when the air passage is formed between the external thread and the internal thread, the sealing structure opens the through hole (31).

7. The sealing nail according to claim 6, characterized in that, The sealing structure includes a boss (224), which protrudes between the connecting part (222) and the covering part (223) and can cover the end of the through hole (31) near the cell cover (1) to close the through hole (31); the boss (224) can also elastically deform as the sealing nail (2) moves so that the boss (224) can be located at the end of the through hole (31) away from the cell cover (1) and the boss (224) is separated from the insulating member (3).

8. The sealing nail according to any one of claims 2-7, characterized in that, The sealing nail (2) also includes a magnetic element (23), which is fixed to the welding part (211), and the outer diameter of the magnetic element (23) is smaller than the outer diameter of the welding part (211).

9. A battery packaging assembly, characterized in that, The battery cell cover (1) includes a sealing pin (2) as described in any one of claims 1-8. The battery cell cover (1) has an injection hole (11) and an internal thread that is threadedly connected to the external thread.

10. A battery, characterized in that, Includes the battery packaging assembly as described in claim 9.

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