Cover plate suitable for secondary ultrasonic welding and storage battery cover

Abstract

According to the cover plate suitable for secondary ultrasonic welding and the storage battery cover provided by the utility model, the welding studs on the bottom surface of the cover plate body are designed, so that during secondary ultrasonic welding, only the cover plate needs to be rotated by 180 degrees and then is welded again; at the moment, the positions, corresponding to the cover plate grooves, of the welding studs are staggered from the positions, corresponding to the cover plate grooves, of the welding studs during first-time ultrasonic welding, the influence caused by carbonization of the surfaces of welding spots due to first-time welding is avoided, and the risk that the safety valve seat is damaged due to excessive welding is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of storage battery technology, specifically relating to a cover plate and a storage battery cover suitable for secondary ultrasonic welding. Background Technology

[0002] After formation, a safety valve needs to be placed on the middle cover of the maintenance-free battery. Finally, a cover plate is welded to the surface of the middle cover to hold the safety valve in place and prevent it from falling off. Several welding studs are installed on the cover plate, and ultrasonic high-frequency welding is used to weld it to the middle cover. In practice, if the cover plate is poorly welded, it needs to be removed and re-welded. However, due to the carbonization of the weld points on the middle cover during the first welding, and the hardening of the plastic surface, the second welding is not ideal, requiring two welding passes. Excessive welding can easily cause the safety valve seat to break, leading to potential quality issues.

[0003] To address the aforementioned issues, existing technologies primarily focus on optimizing the initial welding process or improving the welding head design to increase the initial welding yield. For example, utility model CN202487690U discloses a welding head for lead-acid battery terminals, which reduces the pressure area and increases the non-uniformity of the welding contact surface by adopting a cylindrical welding head design, thereby improving the resistance heating efficiency and thus enhancing the welding effect. However, such technologies mainly focus on optimizing the initial process of terminal welding and do not address the changes in material properties and process adaptability issues in the secondary welding repair scenario of the cover plate. Therefore, how to achieve efficient secondary welding of carbonized weld points without damaging the safety valve structure remains a pressing technical challenge in this field. Utility Model Content

[0004] To address the aforementioned technical problems in the existing technology, this utility model provides a cover plate and a battery cover suitable for secondary ultrasonic welding.

[0005] This utility model provides a cover plate suitable for secondary ultrasonic welding, comprising a thin sheet-shaped cover plate body, the bottom surface of which is provided with protruding welding studs, and the shape of the cover plate body is symmetrical along both the central axis of its length and the central axis of its width; the welding studs include elongated welding studs extending along the length direction of the cover plate body and / or wide welding studs extending along the width direction of the cover plate body; the welding studs adopt an asymmetrical design, wherein each elongated welding stud is asymmetrically designed along the central axis of the length direction of the cover plate body, and each wide welding stud is asymmetrically designed along the central axis of the width direction of the cover plate body; in use, the top surface of the battery cover is provided with a cover plate groove, the cover plate is fitted into the cover plate groove, and the cover plate is welded to the bottom surface of the cover plate groove by ultrasonic welding; during secondary ultrasonic welding, the cover plate is rotated 180° and refitted with the cover plate groove, at which time the position of each welding stud corresponding to the cover plate groove is misaligned with the position of each welding stud corresponding to the cover plate groove during the first ultrasonic welding.

[0006] Furthermore, the welding studs include elongated welding studs extending along the length direction of the cover plate body and wide welding studs extending along the width direction of the cover plate body. During welding, the elongated welding studs preferentially bear the longitudinal bending stress of the cover plate, while the wide welding studs preferentially resist the transverse shear stress. The combined effect of the two can reduce the load concentration of the welding studs in a single direction and reduce the risk of safety valve seat fracture.

[0007] Furthermore, the longitudinal weld studs include multiple sets spaced apart along the length of the cover plate body, each set comprising multiple studs spaced apart along the width of the cover plate body; the transverse weld studs also include multiple sets spaced apart along the length of the cover plate body, each set comprising multiple studs spaced apart along the width of the cover plate body. The multiple sets of longitudinal and transverse weld studs are arranged in a crisscross pattern to form a spatial mesh support system, resulting in a more robust weld and further reducing the risk of safety valve seat breakage.

[0008] Furthermore, the longitudinal welding studs include 2-4 groups arranged at intervals along the length direction of the cover plate body, each group including 3-6 studs arranged at intervals along the width direction of the cover plate body; the transverse welding studs include 4-6 groups arranged at intervals along the length direction of the cover plate body, each group including 2-3 studs arranged at intervals along the width direction of the cover plate body.

[0009] Furthermore, the cross-sectional shape of the welding stud is triangular.

[0010] This utility model also provides a battery cover, including a middle cover and a cover plate. The top surface of the middle cover is provided with a cover plate groove, and the cover plate covers the cover plate groove. The cover plate is the cover plate suitable for secondary ultrasonic welding.

[0011] Furthermore, the bottom surface of the cover plate groove is provided with 6 acid injection holes, which are arranged in a 2×3 pattern and are symmetrically arranged along both the length and width directions of the battery cover. The bottom surface of the cover plate groove is provided with venting grooves, wherein the venting grooves extending to both ends of the length direction of the cover plate groove are symmetrical along the central axis of the width direction of the cover plate groove, and the venting grooves extending to both ends of the width direction of the cover plate groove are symmetrical along the central axis of the length direction of the cover plate groove. Correspondingly, the edge of the cover plate is provided with venting notches, and the notches correspond one-to-one with the extension of each venting groove to the side wall of the cover plate groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This invention designs the welding studs on the bottom surface of the cover plate body. During the second ultrasonic welding, the cover plate only needs to be rotated 180° and then re-welded. At this time, the position of each welding stud corresponding to the cover plate groove is misaligned with the position of each welding stud corresponding to the cover plate groove during the first ultrasonic welding. It will not be affected by the surface carbonization of the weld point caused by the first welding, thus avoiding the risk of damage to the safety valve seat caused by excessive welding. Attached Figure Description

[0014] Figure 1 This is a front view structural diagram of the cover plate of this utility model applicable to secondary ultrasonic welding.

[0015] Figure 2 Compared to the cover plate of this utility model suitable for secondary ultrasonic welding, Figure 1 A schematic diagram of the structure after rotating 180°.

[0016] Figure 3 This is a side view of the cover plate of this utility model, which is applicable to secondary ultrasonic welding.

[0017] Figure 4 This is a top view of the middle cover of the battery cover of this utility model.

[0018] Figure label:

[0019] 1. Cover plate body, 2. Welding stud, 3. Middle cover, 4. Cover plate groove, 5. Acid injection hole column. Detailed Implementation

[0020] like Figures 1-4 As shown, this embodiment provides a cover plate suitable for secondary ultrasonic welding, including a thin cover plate body 1. The bottom surface of the cover plate body 1 has protruding welding studs 2, preferably triangular in cross-sectional shape. The shape of the cover plate body 1 is symmetrical along both its length and width axes. The welding studs 2 include elongated welding studs 2 extending along the length direction of the cover plate body 1 and / or wide welding studs 2 extending along the width direction of the cover plate body 1. The welding studs 2 employ an asymmetrical design, wherein each elongated welding stud 2 is asymmetrically designed along the length axis of the cover plate body 1, and each wide welding stud 2 is asymmetrically designed along the width axis of the cover plate body 1.

[0021] To improve the welding effect, the welding studs 2 include a longitudinal welding stud 2 extending along the length of the cover plate body 1 and a transverse welding stud 2 extending along the width of the cover plate body 1. During welding, the longitudinal welding stud 2 preferentially bears the longitudinal bending stress of the cover plate, while the transverse welding stud 2 preferentially resists the transverse shear stress. The combined effect of the two can reduce the load concentration of the welding stud 2 in a single direction and reduce the risk of safety valve seat fracture.

[0022] To further improve the welding effect, the longitudinal welding studs 2 include multiple sets arranged at intervals along the length of the cover plate body 1, each set including multiple sets arranged at intervals along the width of the cover plate body 1; the transverse welding studs 2 also include multiple sets arranged at intervals along the length of the cover plate body 1, each set including multiple sets arranged at intervals along the width of the cover plate body 1. The multiple sets of longitudinal welding studs 2 and the multiple sets of transverse welding studs 2 are arranged in a cross pattern to form a spatial mesh support system, resulting in a stronger weld and further reducing the risk of safety valve seat breakage.

[0023] Preferred design of welding studs 2: The longitudinal welding studs 2 include 2-4 groups arranged at intervals along the length of the cover body 1, and each group includes 3-6 studs arranged at intervals along the width of the cover body 1; The transverse welding studs 2 include 4-6 groups arranged at intervals along the length of the cover body 1, and each group includes 2-3 studs arranged at intervals along the width of the cover body 1.

[0024] This embodiment also provides a battery cover, including a middle cover 3 and a cover plate. The top surface of the middle cover 3 is provided with a cover plate groove 4, and the cover plate is closed in the cover plate groove 4. The cover plate is the cover plate suitable for secondary ultrasonic welding mentioned above.

[0025] The bottom surface of the cover plate groove 4 is provided with 6 acid injection hole columns 5, which are arranged in a 2×3 manner and are symmetrically arranged in both the length and width directions of the battery cover. The bottom surface of the cover plate groove 4 is provided with venting grooves. The venting grooves extending to both ends of the length direction of the cover plate groove 4 are symmetrical along the central axis of the width direction of the cover plate groove 4, and the venting grooves extending to both ends of the width direction of the cover plate groove 4 are symmetrical along the central axis of the length direction of the cover plate groove 4. Correspondingly, the edge of the cover plate is provided with venting notches, and the notches correspond one-to-one with the venting grooves extending to the side wall of the cover plate groove 4.

[0026] In use, the top surface of the battery's middle cover 3 is provided with a cover plate groove 4. The cover plate is fitted into the cover plate groove 4 and welded to the bottom surface of the cover plate groove 4 by ultrasonic welding. Figure 1 , Figure 2 and Figure 4 As shown, during the first welding, Figure 1 The weld stud 2 in the cover plate shown corresponds to Figure 4 Welding is performed at the solid lines on the three slots of the middle cover; during secondary welding, if... Figure 2 As shown, after rotating the cover plate 180°, align the weld pins 2 in the cover plate with the corresponding... Figure 4 Welding is performed at the dotted lines on the three grooves of the middle cover. At this time, the position of each welding stud 2 corresponding to the cover groove 4 is misaligned with the position of each welding stud 2 corresponding to the cover groove 4 during the first ultrasonic welding. This will not be affected by the surface carbonization of the weld point caused by the first welding, thus avoiding the risk of damage to the safety valve seat caused by excessive welding.

Claims

1. A cover plate suitable for secondary ultrasonic welding, comprising a thin cover plate body, wherein the bottom surface of the cover plate body is provided with raised welding studs, characterized in that, The shape of the cover plate body is symmetrical along both the central axis in the length direction and the central axis in the width direction; The welding studs include elongated welding studs extending along the length direction of the cover plate body and / or wide welding studs extending along the width direction of the cover plate body. The welding studs adopt an asymmetrical design, wherein each longitudinal welding stud is asymmetrically designed along the central axis of the length direction of the cover plate body, and each lateral welding stud is asymmetrically designed along the central axis of the width direction of the cover plate body. In use, the top surface of the battery cover is provided with a cover plate groove. The cover plate is fitted into the cover plate groove and is welded to the bottom surface of the cover plate groove by ultrasonic welding. During the second ultrasonic welding, the cover plate is rotated 180° and refitted with the cover plate groove. At this time, the position of each welding stud corresponding to the cover plate groove is misaligned with the position of each welding stud corresponding to the cover plate groove during the first ultrasonic welding.

2. The cover plate suitable for secondary ultrasonic welding according to claim 1, characterized in that, The welding studs include elongated welding studs extending along the length direction of the cover plate body and wide welding studs extending along the width direction of the cover plate body.

3. The cover plate suitable for secondary ultrasonic welding according to claim 2, characterized in that, The longitudinal welding studs include multiple sets arranged at intervals along the length direction of the cover plate body, and each set includes multiple studs arranged at intervals along the width direction of the cover plate body. The wide-direction welding studs include multiple groups arranged at intervals along the length direction of the cover plate body, and each group includes multiple studs arranged at intervals along the width direction of the cover plate body.

4. The cover plate suitable for secondary ultrasonic welding according to claim 3, characterized in that, The longitudinal welding studs include 2-4 groups arranged at intervals along the length direction of the cover plate body, and each group includes 3-6 studs arranged at intervals along the width direction of the cover plate body. The wide-direction welding studs include 4-6 groups arranged at intervals along the length direction of the cover plate body, and each group includes 2-3 studs arranged at intervals along the width direction of the cover plate body.

5. The cover plate suitable for secondary ultrasonic welding according to claim 1, characterized in that, The cross-sectional shape of the welding stud is triangular.

6. A battery cover, comprising a middle cover and a cover plate, wherein the top surface of the middle cover is provided with a cover plate groove, and the cover plate closes into the cover plate groove, characterized in that, The cover plate is the cover plate suitable for secondary ultrasonic welding as described in any one of claims 1-5.

7. The battery cover according to claim 6, characterized in that, The bottom surface of the cover groove is provided with 6 acid injection holes, which are arranged in a 2×3 pattern and are symmetrically arranged in both the length and width directions of the battery cover. The bottom surface of the cover plate groove is provided with an exhaust groove, wherein the exhaust grooves extending to both ends of the length direction of the cover plate groove are symmetrical along the central axis of the width direction of the cover plate groove, and the exhaust grooves extending to both ends of the width direction of the cover plate groove are symmetrical along the central axis of the length direction of the cover plate groove. Correspondingly, the edge of the cover plate is provided with an exhaust notch, and the notch corresponds one-to-one with the exhaust grooves extending to the side wall of the cover plate groove.

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