Integrated helium bag sealing nail for square lithium battery
Through the gas detection technology of integrated helium-packed sealing nails, the problem that traditional lithium battery sealing nails cannot judge the leakage of welding interfaces is solved, and the reliability and safety of lithium batteries are improved.
Patent Information
- Application Number
- CN202421743488.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-07-23
AI Technical Summary
The sealing nails of traditional square shell lithium batteries cannot effectively determine whether the welding interface is leaking, resulting in liquid leakage in the battery, posing a safety hazard.
The integrated helium-pack sealing nail is used to detect gas detection in the gas storage tank and helium storage port, combined with laser welding and gas detection mechanism, to detect whether it leaks after welding to ensure sealing.
Improve the reliability and safety of lithium batteries to ensure that the sealing performance meets design requirements.
Smart Images
Figure CN223124186U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of power battery manufacturing, in particular to an integrated helium-packaged sealing nail for square lithium batteries. Background Art
[0002] Lithium batteries include structures such as a housing, electrolyte, and cover plate. There is a liquid injection hole on the cover plate. To prevent the welding slag from subsequent sealing sheet welding, the dust from laser cleaning, and the moisture in the air, after injecting the electrolyte, the battery needs to be sealed with a sealing nail. Lithium batteries usually need to detect the sealing performance of the battery. The sealing nail on the traditional square shell battery is a single sealing nail without any available space. When sealing and welding with the liquid injection port, it is impossible to determine whether there is a leak at the welding interface, resulting in the outflow of defective batteries, causing battery leakage and potential safety hazards. Summary of the Utility Model
[0003] In view of the above situation, to overcome the deficiencies of the prior art, the purpose of the present utility model is to provide, and its advantages solve the problems raised in the above background art.
[0004] The above technical purpose of the present utility model is achieved through the following technical solutions:
[0005] An integrated helium-packaged sealing nail for square lithium batteries includes a square shell lithium battery body. On both sides of the top of the square lithium battery body, a battery positive electrode and a battery negative electrode are respectively provided. A welding interface is opened at the top of the square lithium battery body between the battery positive electrode and the battery negative electrode. A liquid injection port is communicated at the bottom of the welding interface. A liquid injection hole is communicated at the bottom of the liquid injection port. The liquid injection hole is communicated with the inside of the square lithium battery body. A sealing nail is hermetically embedded in the welding interface. The top of the sealing nail is set as a head, and a nail part is provided below the head. A gas storage groove is opened on one side of the nail part. A gas storage bag is provided in the gas storage groove, and a gas storage diaphragm is provided outside the gas storage groove.
[0006] By adopting the above technical solution, during the sealing operation, the operator hermetically embeds the sealing nail into the welding interface. At this time, the sealing nail is welded by cooperating with an external laser welding. During the welding operation, the welding heat melts the gas storage diaphragm outside the gas storage groove and melts and releases the gas in the gas storage bag by heating the gas storage bag. The external gas detection mechanism detects the gas around the welded nail for leakage. Whether the gas leaks can be used to determine whether the welding is sealed, improving the use reliability and safety of the square shell lithium battery.
[0007] Further setting: A cylindrical aluminum sheet is fixedly connected to the top of the head in a matching manner.
[0008] By adopting the above technical solution, the cylindrical aluminum sheet can provide good corrosion resistance and weldability for the head of the welded nail.
[0009] Further setting: One side of the gas storage tank is provided with a helium storage port, a helium gas bag is placed in the helium storage port, and a helium storage film is arranged outside the helium storage port.
[0010] By adopting the above technical solution, during the welding operation, the welding heat melts the helium storage film at the helium storage port and melts the helium gas bag to release helium gas, so that the sealing performance can be tested to a certain extent by using the characteristics of helium gas, ensuring that the sealing performance of the battery meets the design requirements.
[0011] Further setting: The nail part gradually tapers from top to bottom.
[0012] By adopting the above technical solution, through the setting that the nail part of the sealing nail gradually tapers from top to bottom, it can gradually fit with the liquid injection port and the liquid injection hole, playing a certain sealing role.
[0013] Further setting: The sealing nail is of a symmetric structure.
[0014] By adopting the above technical solution, the setting that the sealing nail is of a symmetric structure can improve the sealing effect, thereby realizing the isolation between the inside of the battery and the external environment.
[0015] Further setting: The top of the square lithium battery body is fixedly connected with a sealing aluminum cover.
[0016] By adopting the above technical solution, the setting of the sealing aluminum cover can play a role in fixing and sealing, and at the same time can avoid the influence of the outside on the battery, playing a certain protective role.
[0017] In summary, the utility model has the following beneficial effects:
[0018] When the sealing operation is carried out for the utility model, the operator matches and seals the sealing nail into the welding port, and at this time, the sealing nail is welded by cooperating with the external laser welding. During the welding operation process, the welding heat melts the gas storage diaphragm outside the gas storage tank and melts the gas storage bag to release the gas in the gas storage bag. The external gas detection mechanism is used to detect the leakage of the gas around the welding nail. Whether the gas leaks can be used to determine whether the welding is sealed, improving the use reliability and safety of the square shell lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The drawings described herein are used to provide a further understanding of the utility model, and constitute a part of this application, but do not constitute an improper limitation to the utility model. In the drawings:
[0020] Figure 1 is a schematic structural diagram of the square lithium battery body of the utility model;
[0021] Figure 2 is a schematic structural diagram of the sealing nail of the utility model.
[0022] In the figure, 1 is the square shell lithium battery body; 2 is the battery positive electrode; 3 is the battery negative electrode; 4 is the welding port; 5 is the liquid injection port; 6 is the liquid injection hole; 7 is the sealing nail; 8 is the head; 9 is the nail part; 10 is the gas storage tank; 11 is the gas storage bag; 12 is the gas storage diaphragm; 13 is the aluminum sheet; 14 is the helium storage port; 15 is the helium bag; 16 is the helium storage film; 17 is the sealing aluminum cover. Specific implementation mode
[0023] Regarding the foregoing and other technical contents, features and effects of the present utility model, they will be clearly presented in the following detailed description of the embodiments in conjunction with the attached Figure 1 to the attached Figure 2 In the detailed description of the embodiments, it will be clearly shown. The structural contents mentioned in the following embodiments are all with reference to the drawings of the specification.
[0024] The following will describe the exemplary embodiments of the present utility model with reference to the drawings.
[0025] Embodiment 1: An integrated helium bag sealing nail for a square lithium battery, as Figure 1 , 2 shown, including the square shell lithium battery body 1, the battery positive electrode 2 and the battery negative electrode 3 are respectively arranged on both sides of the top of the square lithium battery body. A welding port 4 is opened at the top of the square lithium battery body between the battery positive electrode 2 and the battery negative electrode 3. The bottom of the welding port 4 is communicated with a liquid injection port 5, the bottom of the liquid injection port 5 is communicated with a liquid injection hole 6, and the liquid injection hole 6 is communicated with the inside of the square lithium battery body. A sealing nail 7 is hermetically embedded in the welding port 4 in a matching manner. The sealing nail 7 is a symmetric structure. The top of the sealing nail 7 is set as the head 8, and the head 8 is provided with a nail part 9 below. A gas storage tank 10 is opened on one side of the nail part 9. A gas storage bag 11 is arranged in the gas storage tank 10. A gas storage diaphragm 12 is arranged outside the gas storage tank 10. A helium storage port 14 is arranged on one side of the gas storage tank 10. A helium bag 15 is placed in the helium storage port 14. A helium storage film 16 is arranged outside the helium storage port 14.
[0026] As Figure 2 shown, a cylindrical aluminum sheet 13 is fixedly connected to the top of the head 8 in a matching manner, and the nail part 9 gradually becomes thinner from top to bottom.
[0027] As Figure 1 shown, a sealing aluminum cover 17 is fixedly connected to the top of the square lithium battery body.
[0028] In the embodiment of the present utility model, during the sealing operation, the operator matches and seals the sealing nail 7 into the welded joint 4, and at this time, the sealing nail 7 is welded in cooperation with an external laser welding. During the welding operation, the welding heat melts the gas storage diaphragm 12 outside the gas storage tank 10, and the gas storage bag 11 is melted by heat to release the gas in the gas storage bag 11. The external gas detection mechanism is used to detect the leakage of the gas around the welding nail. Whether the welding is sealed can be determined by whether the gas leaks, which improves the use reliability and safety of the square shell lithium battery. At the same time, during the welding operation, the welding heat melts the helium storage film 16 at the helium storage port 14, and the helium gas bag 15 is melted by heat to release helium gas, which can utilize the characteristics of helium gas to a certain extent for the sealing performance test, ensuring that the sealing performance of the battery meets the design requirements.
[0029] The above is a further detailed description of the present utility model in combination with specific embodiments, and it cannot be determined that the specific implementation of the present utility model is only limited to this; for those skilled in the art of the present utility model and related technical fields, on the premise of the technical solution idea of the present utility model, the expansions, operation methods, and data replacements should all fall within the protection scope of the present utility model.
Claims
1. An integrated helium-pack sealed nail for a square lithium battery, comprising a square lithium battery body, characterized in that: On both sides of the top of the square lithium battery body, a battery positive electrode (2) and a battery negative electrode (3) are respectively provided. A welding port (4) is formed on the top of the square lithium battery body between the battery positive electrode (2) and the battery negative electrode (3). A liquid injection port (5) is communicated with the bottom of the welding port (4). A liquid injection hole (6) is communicated with the bottom of the liquid injection port (5). The liquid injection hole (6) is communicated with the inside of the square lithium battery body. A sealing nail (7) is hermetically and embedded in the welding port (4). The top of the sealing nail (7) is set as a head (8), and a nail part (9) is arranged below the head (8). An air storage groove (10) is formed on one side of the nail part (9). An air storage bag (11) is arranged in the air storage groove (10). An air storage diaphragm (12) is arranged outside the air storage groove (10).
2. The integrated helium-packing sealing nail for a square lithium battery according to claim 1, wherein: A cylindrical aluminum sheet (13) is fixedly connected to the top of the head (8) in a matching manner.
3. An integrated helium-filled sealing nail for a square lithium battery according to claim 1, characterized in that: A helium storage port (14) is arranged on one side of the air storage groove (10). A helium gas bag (15) is placed in the helium storage port (14). A helium storage film (16) is arranged outside the helium storage port (14).
4. The integrated helium-packing sealing nail for a square lithium battery according to claim 1, wherein: The nail part (9) gradually becomes thinner from top to bottom.
5. An integrated helium-filled sealing nail for a square lithium battery according to claim 1, characterized in that: The sealing nail (7) has a symmetrical structure.
6. An integrated helium-pack sealing nail for a square lithium battery according to claim 1, characterized in that: A sealing aluminum cover (17) is fixedly connected to the top of the square lithium battery body.