Battery packaging structure convenient for sealing detection
By improving the matching method between the sealing nails and the top cover sheet of the battery packaging structure, rapid detection of poor welding of sealed aluminum nails is achieved, solving the problem of low sealing detection efficiency, and improving production efficiency and product reliability.
Patent Information
- Application Number
- CN202422172362.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-09-05
AI Technical Summary
In the prior art, the poor welding of sealed aluminum nails cannot be effectively detected, resulting in low seal detection efficiency and inability to identify false welding problems in time, which may cause battery fluid leakage and safety hazards.
Design a battery packaging structure that is easy to seal detection. Through the special cooperation between the sealing nails and the top cover sheet, it ensures that the sealing nails can be sucked up by the vacuum equipment when the welding is poor, so as to realize helium leakage to detect welding defects. A half-spin helium structure is used to reduce helium leakage and detection steps.
It improves the accuracy and production efficiency of seal detection, reduces the use of helium, eliminates liquid leakage at the aluminum nails sealed by the battery cell, and improves the reliability and service life of battery products.
Smart Images
Figure CN223218432U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery assembly, in particular to a battery packaging structure which is convenient for sealing detection. Background Art
[0002] After filling a prismatic aluminum-cased lithium battery, a sealing nail is inserted and then laser welded. Laser welding of the sealing nails often results in poor welds and hot spots due to equipment instability and impurities in the weld area. Helium testing is required to verify the weld seal. Currently available sealing nails seal the helium inside the battery cell after helium filling and compression. After welding, a secondary helium test fails to pull the sealing nails apart. Even if a poor weld is detected, the helium test cannot detect helium escaping from the battery cell due to the seal provided by the sealing nails, leading to a poor weld. Over time, this process causes the sealing nails to age, leading to electrolyte leakage from the battery. As electrolyte acts as a carrier of conductive ions, battery performance plummets. As a pressure differential develops between the inside and outside of the battery cell, moisture in the air also risks entering the cell, posing safety risks such as explosion and fire. Utility Model Content
[0003] The purpose of the utility model is to provide a battery packaging structure that is convenient for sealing detection, so as to solve the problem that the sealing detection efficiency of the existing sealing aluminum nails is low and it is difficult to ensure the sealing detection effect.
[0004] To achieve the above objectives, the present invention provides the following technical solution: a battery packaging structure that facilitates seal detection, comprising a sealing nail, a sealing aluminum nail, and a top cover sheet. The top cover sheet includes a liquid injection hole, the liquid injection hole comprising an upper large-diameter section and a lower small-diameter section. The sealing aluminum nail is welded and installed within the upper large-diameter section. The sealing nail and the lower small-diameter section have an interference fit. A movable gap B is defined between the upper surface of the sealing nail and the lower surface of the sealing aluminum nail. The sealing nail comprises a sealing section, a clamping section, and an introduction section. The sealing section has a cylindrical structure, the clamping section has a prismatic structure, the sealing section and the lower small-diameter section have an interference fit, and the fitting distance A between the sealing section and the lower small-diameter section is less than the movable gap B. The upper large-diameter section has a conical structure.
[0005] As a further improvement of the above technical solution:
[0006] The bottom of the lead-in section is an arc lead-in surface. The arc lead-in surface is rounded to the lead-in section, which is convenient for entry and installation.
[0007] An arc-shaped ventilation section is provided between the sealing section and the clamping section.
[0008] The length range of the fitting distance A is 0.3-0.5 mm.
[0009] The sealing aluminum nail includes a middle section and a transition portion and a bending portion that are symmetrically arranged in sequence relative to the middle section. The bending portion is in sealing contact with the upper large-diameter section by welding, and the transition portion is arranged in an arc surface.
[0010] The surface of the middle section does not exceed the surface of the top cover sheet.
[0011] An air gap is provided at the bent portion and the bottom of the upper large-diameter section.
[0012] Compared with the prior art, the beneficial effects of the present invention are:
[0013] Improved seal detection accuracy: The design of the sealing and locking sections of the sealant, as well as their integration with the top cover, ensures that even if a weld defect occurs within the aluminum sealant, the sealant can be lifted by vacuum suction, allowing internal helium leakage to be detected and effectively identifying a defective aluminum sealant weld. Because the distance between the sealing section and the top cover is smaller than the clearance, the sealant can be lifted by the vacuum equipment in the event of a weld defect, thus avoiding missed detections due to temporary sealing.
[0014] Improved production efficiency: The semi-insertion helium flushing structure allows for direct nail sealing after helium flushing, reducing helium leakage during the nailing process. It also eliminates the nail extraction and insertion steps, improving production efficiency. The improved sealing structure reduces helium leakage during the inspection process, thus saving helium usage.
[0015] Optimized the welding performance detection method: through clear steps (helium filling, nail pressing, welding, helium detection), the welding quality of sealed aluminum nails can be quickly detected, ensuring the quality of the product.
[0016] Eliminate leakage from the aluminum sealing nails of the battery cell: By accurately identifying poor welding, avoid battery cell leakage caused by poor sealing, and improve product reliability and service life.
[0017] In general, the utility model optimizes the structure of battery packaging and also provides an efficient and reliable welding performance detection method, which helps to improve the overall quality and production efficiency of battery products. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of the overall structure of the utility model;
[0019] Figure 2 This is one of the schematic diagrams of the sealing nail structure of the utility model;
[0020] Figure 3 This is the second schematic diagram of the sealing nail structure of the utility model;
[0021] Figure 4 This is a schematic diagram of the semi-insertion and punching structure of the sealing nail of the utility model;
[0022] Figure 5 This is a schematic diagram of the sealing structure of the sealing glue nail of the utility model;
[0023] Figure 6 This is a schematic diagram of the positional relationship between the sealing aluminum nail and the sealing rubber nail of the utility model;
[0024] Figure 7 This is a schematic diagram of the sealing defect detection structure of the utility model.
[0025] Figure numerals: 100, sealing glue nail; 1001, sealing section; 1002, snap-on section; 1003, arc-shaped ventilation section; 1004, introduction section; 200, sealing aluminum nail; 2001, middle section; 2002, transition section; 2003, bending section; 300, top cover piece; 3001, liquid injection hole; 3002, upper large-diameter section; 3003, lower small-diameter section; 500, battery cell casing; 400, helium. DETAILED DESCRIPTION
[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.
[0027] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating directions or positions, are based on the directions or positions shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0028] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0030] The sealing fitting section of the currently commonly used sealing nails is relatively long, generally around 1.5-2.0mm, and the semi-insertion section is relatively short, making it impossible to achieve semi-insertion helium filling, and there is no leakage chamfer. The upward movable stroke of the sealing nail is limited by the sealing aluminum nail. When the sealing aluminum nail has a cold weld, after helium filling and pressing the nail, the sealing nail has sealed the internal helium inside the battery cell. After the sealing aluminum nail is welded, the gap between the sealing nail and the sealing aluminum nail after pressing is generally around 0.5mm, less than 1.5mm. The sealing nail cannot be pulled up during the secondary helium inspection and vacuum pumping. Due to the temporary sealing of the sealing nail, the helium inspection cannot detect that helium is extracted from the battery cell, resulting in the inability to detect poor welding of the sealing aluminum nail, and the inability to achieve rapid detection of the sealing aluminum nail.
[0031] like Figures 1 to 7 As shown, the battery packaging structure of this embodiment, which is convenient for sealing detection, includes a sealing nail 100, a sealing aluminum nail 200 and a top cover sheet 300, the top cover sheet 300 includes a liquid injection hole 3001, the liquid injection hole 3001 includes an upper large diameter section 3002 and a lower small diameter section 3003, the sealing aluminum nail 200 is welded and installed in the upper large diameter section 3002, the sealing nail 100 and the lower small diameter section 3003 are interference fit, and an active gap B is provided on the upper surface of the sealing nail 100 and the lower surface of the sealing aluminum nail 200, the sealing nail 100 includes a sealing section 1001, a clamping section 1002 and an introduction section 1004, the sealing section 1001 is a cylindrical structure, the clamping section 1002 is a prismatic structure, the sealing section 1001 and the lower small diameter section 3003 are interference fit, and the fitting distance A between the sealing section 1001 and the lower small diameter section 3003 is smaller than the active gap B.
[0032] The sealing section 1001 forms the seal between the sealing nail 100 and the top cover 300. Its design length is 0.4mm, ensuring that if the sealing nail is not properly welded during secondary helium inspection, the sealing section 1001 can be removed by vacuuming. The clamping section 1002 is the anchor point, featuring a nearly straight design with an interference fit with the lower small-diameter section 3003, allowing for partial insertion and helium injection. An arc-shaped vent section 1003 is located between the sealing section 1001 and the clamping section 1002. This arc-shaped vent section 1003 is located to prevent helium leakage when the nail is moved upward.
[0033] The bottom of the lead-in section 1004 is an arc lead-in surface, which is convenient for entry and installation.
[0034] The length of the fitting distance A ranges from 0.3 to 0.5 mm. If the fitting distance A is too short, the fitting stability cannot be guaranteed, and excessive pressure inside the cell housing 500 may cause it to break open. If the fitting distance A is too long, the sealing nail 100 cannot be sucked out, making it impossible to test the welding performance of the sealing aluminum nail 200.
[0035] The sealing aluminum nail 200 includes a middle section 2001 and a transition portion 2002 and a bending portion 2003 symmetrically arranged relative to the middle section 2001. The bending portion 2003 is in sealing contact with the upper large diameter section 3002 by welding, and the transition portion 2002 is arranged in an arc surface.
[0036] The surface of the middle section 2001 does not exceed the surface of the top cover sheet 300 .
[0037] An air gap is provided between the bent portion 2003 and the bottom of the upper large diameter section 3002 .
[0038] This embodiment introduces a welding performance detection method:
[0039] STEP1 Helium filling: Figure 4 As shown, the sealing nail 100 is half-inserted into the top cover sheet 300, and the clamping section 1002 is interference-fitted with the lower small-diameter section 3003 to prevent the sealing nail 100 from falling out during the process before being pressed in. After vacuuming, helium 400 is filled into the inner cavity of the battery cell housing 500 (as shown in the direction of the arrow) through the gaps between the three clamping positions of the clamping section 1002;
[0040] STEP2 Press nails: Figure 5 As shown, when the helium is filled to the required concentration or pressure, the sealing nail 100 is pressed down, and the helium is sealed and retained in the battery cell housing 500, and the lower small diameter section 3003 and the sealing section 1001 cooperate to form a seal;
[0041] STEP3 welding: Figure 6 As shown, the sealing aluminum nail 200 and the top cover sheet 300 are laser welded;
[0042] STEP4 Helium test: Figure 7 As shown, when a weld defect occurs between the aluminum sealing nail 200 and the top cover sheet 300, the vacuum environment draws the sealant nail 100 upwards, close to the sealant nail 100. Because the distance A between the sealing section 1001 and the lower small-diameter section 3003 is less than the clearance B, the curved vent section 1003 is exposed, allowing helium 400 to escape from the curved vent section 1003. This helium 400 is then drawn into the detection sensor, triggering an alarm. This indicates a weld defect and requires rework.
[0043] The utility model discloses that when there is a defect in the welding of the sealing aluminum nail, the sealing nail can effectively suck out the helium in the inner cavity of the battery cell after the vacuum suction moves upward to the right position, so as to accurately identify the poor welding of the sealing aluminum nail, reduce the possibility of missing the inspection of the battery cell due to the poor welding of the sealing nail, and put an end to the leakage of the sealing aluminum nail of the battery cell.
[0044] This new sealant nail can be partially inserted and helium-flushed, thus saving time for nail extraction and insertion during helium testing and improving production efficiency. The semi-insertion and helium-flushing structure allows for immediate nail compression and sealing after helium flushing, significantly reducing helium leakage from the helium flushing to nail compression, thus saving helium usage during testing.
[0045] The above is only an embodiment of the present invention, and common knowledge such as the specific structure and characteristics of the scheme are not described in detail here. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claim involved.
Claims
1. A battery packaging structure that facilitates sealing detection, comprising a sealing glue nail (100), a sealing aluminum nail (200) and a top cover sheet (300), characterized in that: The top cover sheet (300) includes a liquid injection hole (3001), and the liquid injection hole (3001) includes an upper large diameter section (3002) and a lower small diameter section (3003). The sealing aluminum nail (200) is welded and installed in the upper large diameter section (3002). The sealing glue nail (100) and the lower small diameter section (3003) are interference fit. The upper surface of the sealing glue nail (100) and the lower surface of the sealing aluminum nail (200) are provided with movable The gap B, the sealing nail (100) comprises a sealing section (1001), a clamping section (1002) and an introduction section (1004), the sealing section (1001) is a cylindrical structure, the clamping section (1002) is a prismatic structure, the sealing section (1001) and the lower small-diameter section (3003) are interference-fitted, and the fitting distance A between the sealing section (1001) and the lower small-diameter section (3003) is smaller than the active gap B.
2. The battery packaging structure for facilitating sealing detection according to claim 1, characterized in that: The bottom of the introduction section (1004) is an arc introduction surface.
3. The battery packaging structure for facilitating sealing detection according to claim 1, characterized in that: An arc-shaped ventilation section (1003) is provided between the sealing section (1001) and the clamping section (1002).
4. The battery packaging structure for facilitating sealing detection according to claim 2 or 3, characterized in that: The length range of the fitting distance A is 0.3-0.5 mm.
5. The battery packaging structure for facilitating sealing detection according to claim 1, characterized in that: The sealing aluminum nail (200) comprises a middle section (2001) and a transition portion (2002) and a bending portion (2003) which are symmetrically arranged in sequence relative to the middle section (2001); the bending portion (2003) and the upper large-diameter section (3002) are in sealed contact by welding, and the transition portion (2002) is arranged in an arc surface.
6. The battery packaging structure for facilitating sealing detection according to claim 5, characterized in that: The surface of the middle section (2001) does not exceed the surface of the top cover sheet (300).
7. The battery packaging structure for facilitating sealing detection according to claim 6, characterized in that: An air gap is provided at the bottom of the bending portion (2003) and the upper large-diameter section (3002).