Battery shell welding tool and ultrasonic plastic welding machine

Abstract

The battery shell welding tool comprises a welding head, a positioning jig and a discharging assembly, the welding head is arranged at the lower end of a transducer, the positioning jig is fixed to a base, the positioning jig is provided with a profiled groove for containing a battery shell to be welded, and an opening, used for feeding and discharging, of the profiled groove is formed in the upper end face of the positioning jig. A to-be-welded battery shell falls into the groove through the opening and is positioned in the groove, and the welding head and the positioning jig cooperate to carry out ultrasonic welding operation on the to-be-welded battery shell in the groove; an operation hole is formed in the groove bottom of the profiled groove, the discharging assembly is arranged on the base and located below the operation hole, and the discharging assembly pushes the welded battery shell upwards through the operation hole to be ejected out of an opening of the profiled groove. The battery shell to be welded is positioned through the positioning jig, the battery shell to be welded is laterally protected through the inner side wall of the groove, the ultrasonic welding quality is improved, the welded battery shell is upwards ejected out of the positioning jig through the discharging assembly, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production equipment, in particular to a battery shell welding tool and an ultrasonic plastic welding machine. Background Art

[0002] With the continuous development of electronic equipment technology, many small electrical equipment will use rechargeable lithium batteries as power sources. Lithium batteries can be integrated into electrical equipment, or installed on land-using equipment in a detachable and replaceable manner. For the detachable and replaceable method, the battery is required to have certain waterproof and dustproof properties to ensure the safety of lithium batteries. In the production process of such lithium battery products, the battery pack is generally fixed in the battery shell, and the shell and the cover are fixed by bolts. This fixing method requires nuts to be buried in the shell, and the bolts are installed by a screw machine. There are many production processes, low production efficiency, and general waterproof effect. Plastic shells and covers can also be fixed by ultrasonic welding, but during the ultrasonic welding process, the cover and shell need to be squeezed, and the side walls of the shell are easily squeezed and deformed, and even cause the shell to rupture or squeeze the battery pack inside the battery, affecting the quality of the battery. Utility Model Content

[0003] In order to solve the deficiencies of the prior art, the utility model provides a battery shell welding tool and an ultrasonic plastic welding machine.

[0004] In the first aspect, the utility model provides a battery shell welding tool, which is installed between the transducer and the base of the ultrasonic plastic welding machine, and includes a welding head, a positioning jig, and a blanking assembly. The welding head is arranged at the lower end of the transducer, and the positioning jig is fixed on the base. The positioning jig is provided with a groove for placing the battery shell to be welded, and the opening of the groove for loading and unloading is arranged on the upper end face of the positioning jig. The battery shell to be welded falls into and is positioned in the groove through the opening, and the welding head cooperates with the positioning jig to perform ultrasonic welding on the battery shell to be welded in the groove; an operating hole is opened at the bottom of the groove, and the blanking assembly is arranged on the base and located below the operating hole. The blanking assembly pushes the welded battery shell upward through the operating hole to be ejected from the opening of the groove.

[0005] In some of the embodiments, the inner side wall of the groove is provided with a positioning groove matching the protrusion of the battery shell to be welded, and the positioning groove extends from the opening of the groove to the bottom of the groove.

[0006] In some embodiments, the positioning fixture is square, and a circle of outer steps fixed to the base is provided at the lower end of the positioning fixture.

[0007] In some of the embodiments, the welding area of ​​the battery casing to be welded is located within the groove.

[0008] In some of the embodiments, the depth of the groove is lower than the thickness of the battery casing to be welded.

[0009] In some embodiments, the unloading assembly includes a mounting frame, a driving member and a ejecting plate, the mounting frame is vertically fixed under the base, the driving member is installed on one side of the mounting frame, the ejecting plate is arranged at the driving end of the driving member, the shape of the ejecting plate matches the operating hole, and the driving member drives the ejecting plate to move back and forth between the operating hole and the groove.

[0010] In some embodiments, the driving member is a double-axis cylinder, and the mounting frame is provided with a solenoid valve for controlling the movement of the double-axis cylinder. The solenoid valve and the double-axis cylinder are arranged side by side and connected through a pipeline.

[0011] In some embodiments, the operation hole is a square hole, and the operation hole is arranged through the center of the bottom of the groove.

[0012] In some embodiments, the welding head is overall square-shaped, and two outer walls in the width direction of the welding head are symmetrically provided with two concave surfaces. In the concave area, the welding head is provided with three grooves at equal intervals in the length direction, and the grooves penetrate and connect the two concave surfaces along the width direction of the welding head.

[0013] In the second aspect, the utility model also provides an ultrasonic plastic welding machine, including a frame, a base, an ultrasonic generator and a transducer, wherein the transducer is arranged above the base through the frame, and the transducer is arranged on the frame in a lifting manner, and the transducer is electrically connected to the ultrasonic generator, and the battery shell welding tooling described in the first aspect is arranged between the base and the transducer.

[0014] Compared with the prior art, the utility model has the following beneficial effects: the battery shell to be welded is positioned by the groove of the positioning jig, the groove is only open on the upper side, and the four inner side walls and the groove bottom of the groove can well position the battery shell to be welded, ensuring that the main body of the battery shell to be welded can remain stable during the welding process, improving the quality of ultrasonic welding, and after welding is completed, the blanking assembly under the positioning jig pushes the welded battery shell upward out of the positioning jig, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the ultrasonic plastic welding machine according to an embodiment of the present application.

[0016] Figure 2 It is a schematic diagram of the assembly structure of the base and the positioning fixture of an embodiment of the present application.

[0017] Figure 3 It is a schematic diagram of the assembly structure of the base and the blanking component of the embodiment of the present application.

[0018] Figure 4 It is a schematic diagram of the exploded view of the battery casing welding tooling of the embodiment of the present application.

[0019] Figure 5 It is a three-dimensional schematic diagram of a battery housing to be welded in an embodiment of the present application placed on a positioning fixture.

[0020] Figure 6 It is a schematic diagram of the exploded structure of the battery housing to be welded and the positioning fixture in an embodiment of the present application.

[0021] Reference numerals: 101, ultrasonic generator; 102, frame; 103, transducer;

[0022] 1. Base; 11. Square hole;

[0023] 2. welding head; 21. concave surface; 22. intermediate groove;

[0024] 3. Positioning fixture; 31. Profile groove; 32. Opening; 33. Inner wall; 34. Groove bottom; 35. Positioning groove; 36. Operating hole; 37. External step;

[0025] 4. Unloading assembly; 41. Mounting frame; 42. Driving member; 43. Ejector plate; 44. Solenoid valve; 45. Pipeline;

[0026] 5. Battery shell to be welded; 51. Main body; 52. Cover; 53. Bump; 54. Teeth; 55. Inner step. DETAILED DESCRIPTION

[0027] The specific implementation modes of the present utility model are introduced with reference to the accompanying drawings.

[0028] refer to Figure 1 The figure is a schematic diagram of the three-dimensional structure of the ultrasonic plastic welding machine. The right side of the figure is an ultrasonic generator 101, and the left side is, from top to bottom, a frame 102, a transducer 103, a welding head 2, a battery shell 5 to be welded, a positioning fixture 3 and a base 1. The battery shell 5 to be welded is placed on the positioning fixture 3. The ultrasonic generator 101 provides an electrical signal to the transducer 103, and the transducer 103 converts it into mechanical vibration and transmits it to the welding head 2. The welding head 2 is pressed down to the battery shell 5 to be welded, and the cover 52 of the battery pack to be welded is welded and fixed to the main body 51.

[0029] refer to Figures 1 to 6A battery shell welding tool is installed between the transducer 103 and the base 1 of the ultrasonic plastic welding machine, including a welding head 2, a positioning fixture 3, and a blanking assembly 4. The welding head 2 is arranged at the lower end of the transducer 103, the positioning fixture 3 is fixed on the base 1, and the positioning fixture 3 is provided with a groove 31 for placing the battery shell 5 to be welded. The opening 32 of the groove 31 for loading and unloading is arranged on the upper end surface of the positioning fixture 3. The battery shell 5 to be welded falls into and is positioned in the groove 31 through the opening 32. The welding head 2 cooperates with the positioning fixture 3 to perform ultrasonic welding on the battery shell 5 to be welded in the groove 31; the groove bottom 34 of the groove 31 is provided with an operating hole 36, the blanking assembly 4 is arranged on the base 1 and is located below the operating hole 36, and the blanking assembly 4 pushes the welded battery shell upward through the operating hole 36 to be ejected from the opening 32 of the groove 31.

[0030] The battery shell welding tooling of the embodiment of the present application positions the battery shell 5 to be welded by the groove 31 of the positioning fixture 3. The groove 31 has only an upper opening 32. The four inner side walls 33 and the groove bottom 34 of the groove 31 can well position the battery shell 5 to be welded, and provide better lateral protection for the battery shell 5 to be welded, thereby ensuring that the main body 51 of the battery shell 5 to be welded can remain stable during the welding process, thereby improving the quality of ultrasonic welding. After welding is completed, the unloading assembly 4 below the positioning fixture 3 lifts the welded battery shell upward, and pushes the battery shell out of the positioning fixture 3 to complete the unloading.

[0031] In order to position the battery housing 5 to be welded, in this embodiment, reference Figure 2 and Figure 6 The inner side wall 33 of the groove 31 is provided with a positioning groove 35 matching the protrusion 53 of the battery shell 5 to be welded, and the positioning groove 35 extends from the opening 32 of the groove 31 to the groove bottom 34.

[0032] It can be understood that, in such a configuration, a protrusion 53 is provided on the main body 51 of the battery shell 5 to be welded, and the protrusion 53 is used to facilitate the disassembly of the battery pack after the battery pack is installed on the land equipment. The cover 52 needs to be kept level when welding with the main body 51, and the thickness of the battery shell is not necessarily uniform. The ups and downs of the groove bottom 34 of the groove 31 will be optimized according to the end face of the battery shell, so that after the battery shell is placed in the groove 31, the cover 52 is horizontal, and the protrusion 53 protrudes compared to the end face of the main body 51, which can be well used as a directional positioning structure during the welding process. Through the assembly of the protrusion 53 and the positioning groove 35, each battery shell 5 to be welded is placed in the positioning fixture 3 in the same direction, thereby ensuring the consistency of the welding of each battery shell.

[0033] In order to fix the positioning fixture 3 on the base 1, in this embodiment, refer to Figure 1 and Figure 2The positioning fixture 3 is square in shape, and a circle of outer steps 37 fixed to the base 1 is provided at the lower end of the positioning fixture 3 .

[0034] It is understandable that, with such a configuration, soft-pack battery packs and cylindrical battery packs are mostly square-shaped, and the battery casing will also basically be square, so as to better protect the internal battery pack. A square groove 31 is provided on the square positioning fixture 3 to accommodate the square battery. The square frame-shaped outer step 37 of the positioning fixture 3 is convenient for installing bolts, and is fixed to the base 1 by bolts, thereby ensuring that the positioning fixture 3 and the base 1 can be better connected together.

[0035] In order to ensure the quality of welding, in this embodiment, reference Figure 5 The welding area of ​​the battery shell 5 to be welded is located in the groove 31.

[0036] It can be understood that, with such an arrangement, the side walls above the step 55 in the main body 51 of the battery casing are thinner, the main body 51 is placed in the groove 31, and the welding area is located in the groove 31, which can ensure that the side walls of the main body 51 in the welding area can be laterally protected by the inner side walls 33 of the groove 31, thereby preventing the welding head 2 from driving the cover 52 and the main body 51 to vibrate against each other during welding, thereby breaking the side walls of the main body 51 and causing cracks.

[0037] In order to ensure that the welding head 2 can contact and apply pressure to the battery housing, in this embodiment, reference Figure 5 The depth of the groove 31 is lower than the thickness of the battery shell 5 to be welded.

[0038] It can be understood that, in such a configuration, the main body 51 of the battery casing 5 to be welded is placed in the groove 31, and then the cover 52 is covered on the main body 51, and the end face of the cover 52 is higher than the groove 31, so that the welding head 2 can contact the cover 52 to transmit vibration and apply pressure to the cover 52 and the main body 51.

[0039] In order to push the welded battery shell out of the groove 31, in this embodiment, Figure 3 and Figure 4 The unloading assembly 4 includes a mounting frame 41, a driving member 42 and a ejecting plate 43. The mounting frame 41 is vertically fixed below the base 1. The driving member 42 is installed on one side of the mounting frame 41. The ejecting plate 43 is arranged at the driving end of the driving member 42. The shape of the ejecting plate 43 matches the operating hole 36. The driving member 42 drives the ejecting plate 43 to move back and forth between the operating hole 36 and the groove 31.

[0040] It can be understood that, with such a configuration, the battery shell falls into the groove 31 at the opening 32 by gravity. The groove 31 has only one opening 32 on the upper side. The battery shell in the groove 31 is lifted upward by the ejector plate 43 below the bottom 34 of the groove 31, which can ensure that the battery shell can be stably ejected from the groove 31, quickly complete the ejection of the battery shell, and improve production efficiency.

[0041] In order to stabilize the lifting battery housing, in this embodiment, reference Figure 3 and Figure 4 The driving member 42 is a double-axis cylinder, and a solenoid valve 44 for controlling the action of the double-axis cylinder is arranged on the mounting frame 41. The solenoid valve 44 and the double-axis cylinder are arranged side by side and connected through a pipeline 45.

[0042] It can be understood that, with such a configuration, the double-axis cylinder restricts each other through the two piston rods, so that the ejection plate 43 will not shake or rotate, and each time the ejection plate 43 is lifted, it passes through the operating hole 36 in the same posture and lifts the battery casing, which is more stable to use; the double-axis cylinder has two air ports, and the gas inlet and outlet are controlled by the solenoid valve 44, so that the cylinder can be pushed out or pulled back, and the switching speed of the battery valve is fast, which improves the switching speed of the double-axis cylinder lifting and retracting actions, thereby improving production efficiency.

[0043] In order to ensure that the lifting plate 43 stably lifts the battery housing, in this embodiment, Figure 2 and Figure 4 The operating hole 36 is a square hole 11 , and the operating hole 36 is arranged through the center of the groove bottom 34 of the groove 31 .

[0044] It can be understood that, with such a configuration, the operating hole 36 is located in the center of the bottom 34 of the groove 31, which can ensure that the ejection plate 43 will contact the central area of ​​the lower end surface of the battery casing, so that the center of gravity of the battery casing will fall in the area of ​​the ejection plate 43, so that the ejection plate 43 can vertically lift the battery casing to avoid the battery casing from tilting during the lifting process, and ensure that the surface of the battery casing will not be scratched against the inner wall 33 of the groove 31, so that the entire lifting and unloading process of the battery casing is stable and smooth.

[0045] It should be further explained that the base 1 is provided with a square hole 11 communicating with the operating hole 36 , and in a non-moving state, the ejector plate 43 is located between the square hole 11 and the operating hole 36 .

[0046] In order to improve the quality of welding, in this embodiment, reference Figure 1 and Figure 4 The welding head 2 is in a square shape as a whole, and two outer side walls in the width direction of the welding head 2 are symmetrically provided with two concave surfaces 21. In the concave surface 21 area, the welding head 2 is provided with three intermediate grooves 22 at equal intervals in the length direction. The intermediate grooves 22 penetrate and connect the two concave surfaces 21 along the width direction of the welding head 2.

[0047] It can be understood that, with such a configuration, the welding head 2 needs to transmit the mechanical vibration of the transducer 103 to the cover 52 and the main body 51. The two concave surfaces 21 are for gathering energy. The position of the intermediate groove 22 is located at half the wavelength of the transverse wave. The intermediate groove 22 can attenuate the transverse wave of the ultrasonic vibration, thereby improving the uniformity of the welding layer between the cover 52 and the main body 51 and improving the quality of welding.

[0048] It should be further explained that a circle of teeth 54 is provided downwardly at the edge where the cover 52 is welded to the inner step 55 of the main body 51. During the ultrasonic vibration process, the teeth 54 will slowly insert into the inner step 55 of the main body 51 and melt, thereby making the welding layer between the cover 52 and the inner step 55 of the main body 51 more solid.

[0049] The battery shell welding tooling of the embodiment of the present application protects the side walls of the main body 51 of the battery shell laterally through the four inner walls 33 of the groove 31 of the positioning fixture 3, thereby preventing deformation and damage to the main body 51 except for the welding area during the welding process, ensuring that the main body 51 can remain stable during the welding process and improving the quality of ultrasonic welding. After the welding is completed, the dual-axis cylinder below lifts the battery shell welded in the groove 31 upward through the ejection plate 43, and the battery shell is vertically ejected from the positioning fixture 3, ensuring that the surface of the battery shell will not be scratched by the inner wall 33 of the groove 31, thereby protecting the safety of the battery shell.

[0050] The embodiment of the present application also provides an ultrasonic plastic welding machine, including a frame 102, a base 1, an ultrasonic generator 101 and a transducer 103. The transducer 103 is arranged above the base 1 through the frame 102. The transducer 103 is arranged on the frame 102 in a lifting manner. The transducer 103 is electrically connected to the ultrasonic generator 101. The above-mentioned battery shell welding tooling is arranged between the base 1 and the transducer 103.

[0051] It should be further explained that the ultrasonic generator 101 generates an electrical signal to the transducer 103, and the transducer 103 converts the electrical signal into mechanical vibration and transmits it to the welding head 2. The main body 51 and the cover 52 of the battery shell 5 to be welded are placed on the positioning fixture 3, and the main body 51 is stuck in the groove 31 of the positioning fixture 3. The welding head 2 is pressed down to contact the cover 52 and drive the cover 52 to vibrate. The contact surface between the edge of the cover 52 and the inner step 55 of the inner wall of the main body 51 is heated by friction. When the temperature reaches the melting point of the plastic material, the contact area between the edge of the cover 52 and the inner step 55 of the inner wall of the main body 51 is melted. After the plastic is melted, the welding head 2 will also apply a certain pressure to it to press the molten plastic tightly together. At the same time, the pressure can also promote the flow of the molten plastic, so that it can better fill the gap at the connection. After the ultrasonic vibration is stopped, the connection is cooled and solidified to form a uniform welding layer.

[0052] The ultrasonic plastic welding machine of the embodiment of the present application is used at the rear end of the battery assembly production line. After the battery pack and the control board are assembled to the main body 51, the cover 52 is welded and fixed to the main body 51 through the welding head 2 to form a battery with good sealing effect, thereby improving the waterproof and dustproof performance of the battery, reducing the assembly process and improving the production efficiency of the battery.

[0053] The above does not limit the technical scope of the present invention. Any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A battery shell welding tool, which is installed between the transducer and the base of an ultrasonic plastic welding machine, characterized in that: It includes a welding head, a positioning jig, and a blanking assembly. The welding head is arranged at the lower end of the transducer, the positioning jig is fixed on the base, the positioning jig is provided with a groove for placing the battery shell to be welded, the opening of the groove for loading and unloading is arranged on the upper end surface of the positioning jig, the battery shell to be welded falls into and is positioned in the groove through the opening, and the welding head cooperates with the positioning jig to perform ultrasonic welding on the battery shell to be welded in the groove; an operating hole is opened at the bottom of the groove, the blanking assembly is arranged on the base and is located below the operating hole, and the blanking assembly pushes the welded battery shell upward through the operating hole to eject it from the opening of the groove.

2. The battery casing welding tool according to claim 1, characterized in that: The inner side wall of the groove is provided with a positioning groove matching with the protrusion of the battery shell to be welded, and the positioning groove extends from the opening of the groove to the bottom of the groove.

3. The battery casing welding tool according to claim 1, characterized in that: The positioning fixture is square-shaped, and a circle of outer steps fixed to the base is arranged at the lower end of the positioning fixture.

4. The battery casing welding tool according to claim 1, characterized in that: The welding area of ​​the battery shell to be welded is located in the groove.

5. The battery casing welding tool according to claim 1, characterized in that: The depth of the groove is lower than the thickness of the battery shell to be welded.

6. The battery casing welding tool according to claim 1, characterized in that: The unloading assembly includes a mounting frame, a driving member and a ejecting plate. The mounting frame is vertically fixed below the base, the driving member is installed on one side of the mounting frame, the ejecting plate is arranged at the driving end of the driving member, the shape of the ejecting plate matches the operating hole, and the driving member drives the ejecting plate to move back and forth between the operating hole and the groove.

7. The battery casing welding tool according to claim 6, characterized in that: The driving member is a double-axis cylinder, and a solenoid valve for controlling the movement of the double-axis cylinder is arranged on the mounting frame. The solenoid valve and the double-axis cylinder are arranged side by side and connected through a pipeline.

8. The battery casing welding tool according to claim 7, characterized in that: The operating hole is a square hole, and the operating hole is arranged through the center of the bottom of the groove.

9. The battery casing welding tool according to claim 1, characterized in that: The welding head is in a square shape as a whole, and two outer side walls in the width direction of the welding head are symmetrically provided with two concave surfaces. In the concave surface area, the welding head is provided with three grooves at equal intervals in the length direction, and the grooves penetrate and connect the two concave surfaces along the width direction of the welding head.

10. An ultrasonic plastic welding machine, characterized in that: It comprises a frame, a base, an ultrasonic generator and a transducer, wherein the transducer is arranged above the base through the frame, the transducer is arranged on the frame in a lifting manner, the transducer is electrically connected to the ultrasonic generator, and the battery shell welding tooling according to any one of claims 1 to 9 is arranged between the base and the transducer.

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