Battery string processing equipment and battery string

Abstract

The utility model relates to the field of photovoltaic cells, in particular to battery string processing equipment and a battery string, the processing equipment comprises a cutting mechanism, the cutting mechanism comprises a cutting piece, the cutting piece is used for cutting a welding strip of a processing section, and the welding strip is provided with an end part after being cut; the gluing mechanism comprises a gluing piece, and the gluing piece is used for spraying insulation glue on the uncut welding strip in the processing section; or the gluing piece is used for spraying the insulating glue on the end part formed after the welding strip is cut in the processing section; and the bearing mechanism is used for bearing the battery string, and the bearing mechanism has a moving freedom degree, so that the bearing mechanism can drive the battery string to move, the cutting piece can cut the welding strip in the processing section, and the gluing piece sprays insulation glue on the welding strip or the end part in the processing section. The technical problem that the processing quality of the battery string processing equipment is low is solved, and the technical effect of improving the processing quality of the battery string processing equipment is achieved.

Description

Technical Field

[0001] This application relates to the field of photovoltaic cells, and in particular to the design of a battery string processing device and a battery string. Background Technology

[0002] As a special type of battery, the BC battery has its positive and negative electrodes located on the same side of the battery string. This compact layout greatly improves the battery's energy density and flexibility.

[0003] In the existing technology, during the production and processing stage of battery strings, due to technical limitations, it is difficult to precisely cut the welding strips at the edges of the battery strings to a very short length. As a conductive component connecting the battery strings, the length and shape of the welding strips are crucial to the performance and safety of the batteries. Longer welding strips not only increase the complexity of battery assembly, but also make the ends of the welding strips prone to bending during subsequent processing, transportation, or installation. Once the ends of the welding strips bend and come into contact with adjacent battery strings or other conductive components, it can cause a short circuit in the battery strings.

[0004] Therefore, the technical problem with existing technologies is that the processing quality of battery string processing equipment is relatively low. Utility Model Content

[0005] This application provides a battery string processing device and a battery string, which solves the technical problem of low processing quality of the battery string processing device and achieves the technical effect of improving the processing quality of the battery string processing device.

[0006] On the one hand, the battery string processing equipment provided in this application adopts the following technical solution:

[0007] A battery string processing device is used to process battery strings, wherein the battery cells of the battery string have solder strips between them. A processing segment is defined as a solder strip cut between the battery cells according to preset requirements. The device includes: a cutting mechanism, comprising a cutting element for cutting the solder strip of the processing segment, wherein the cut solder strip has an end; an adhesive coating mechanism, comprising an adhesive coating element for spraying insulating adhesive onto the uncut solder strip within the processing segment; or, the adhesive coating element for spraying insulating adhesive onto the end formed after cutting the solder strip within the processing segment; and a support mechanism for supporting the battery string, the support mechanism having a degree of freedom of movement, allowing the support mechanism to move the battery string so that the cutting element can cut the solder strip within the processing segment, and the adhesive coating element can spray insulating adhesive onto the solder strip or the end formed within the processing segment.

[0008] Preferably, the adhesive application mechanism further includes an adhesive application base; the adhesive application component is rotatably connected to the adhesive application base, so that the position of the adhesive application component can be adjusted by rotation.

[0009] Preferably, the adhesive applicator has at least two degrees of freedom of movement, one in the horizontal direction and one in the vertical direction, so as to adjust the position of the adhesive applicator.

[0010] Preferably, the direction of movement of the battery string is defined as the working direction; the cutting assembly further includes a cutting seat, which has a degree of freedom of movement perpendicular to the working direction, so as to drive the cutting element to adjust its position.

[0011] Preferably, the direction of movement of the battery string is defined as the working direction; the battery string processing equipment further includes an air blowing mechanism, which is located on the side of the cutting mechanism in the working direction and is arranged adjacent to the cutting mechanism, so that the air blowing mechanism can blow air to remove the cut solder strip.

[0012] Preferably, the air blowing mechanism includes: an air blowing base; an air knife having an air outlet, the air outlet being inclined toward the movement path of the battery string.

[0013] Preferably, the supporting mechanism includes: a support base having a supporting surface for supporting the battery string, and the supporting surface having an adsorption function to adsorb and fix the battery string.

[0014] Preferably, a curing mechanism is also included, which is used to cure the insulating adhesive on the cut and coated solder strip.

[0015] Preferably, the system also includes a vision mechanism for acquiring battery string location information.

[0016] On the other hand, the battery string provided in this application adopts the following technical solution:

[0017] A battery string includes a plurality of battery cells connected by solder strips, wherein an odd number of solder strips are connected and an even number of solder strips are broken to form ends, and the ends are provided with insulating adhesive, where n is a positive integer; or, an even number of solder strips are connected and an odd number of solder strips are broken to form ends, and the ends are provided with insulating adhesive, where n is a positive integer.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] The battery string processing equipment of this application is equipped with an adhesive coating mechanism, which can spray insulating adhesive onto the welding strips between battery cells. It can wrap the two ends formed by cutting with insulating adhesive after cutting, or spray insulating adhesive onto the welding strips before cutting. Both methods can make the ends formed after cutting the welding strips insulated, preventing the welding strips from bending and causing short circuits. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the battery string to be processed by the battery string processing equipment described in this application;

[0021] Figure 2 yes Figure 1 Enlarged view of A in the middle;

[0022] Figure 3 This is a schematic diagram of a battery string after it has been cut by the battery string processing equipment described in this application;

[0023] Figure 4 yes Figure 3 Enlarged view of B in the middle;

[0024] Figure 5 This is a schematic diagram of the battery string processing equipment described in this application;

[0025] Figure 6 This is a schematic diagram of the support mechanism of the battery string processing equipment described in this application;

[0026] Figure 7 This is a schematic diagram of the cutting mechanism of the battery string processing equipment described in this application;

[0027] Figure 8 This is a schematic diagram of the adhesive coating mechanism of the battery string processing equipment described in this application;

[0028] Figure 9 This is a schematic diagram of the battery string after the adhesive has been applied;

[0029] Figure 10 yes Figure 9 Enlarged view of C;

[0030] Figure 11 This is a schematic diagram of the curing mechanism of the battery string processing equipment described in this application.

[0031] Explanation of reference numerals in the attached drawings: 100, battery string; 110, battery cell; 120, welding strip; 121, processing section; 1211, end; 1212, insulating component; 200, bearing mechanism; 210, bearing seat; 220, bearing surface; 300, vision mechanism; 400, cutting mechanism; 410, cutting seat; 420, cutting component; 500, air blowing mechanism; 510, air blowing seat; 520, air knife; 600, glue application mechanism; 610, glue application seat; 620, glue application component; 700, curing mechanism. Detailed Implementation

[0032] The serial numbers assigned to components in this document, such as "first" and "second," are used solely to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used solely for the convenience of describing this application and simplifying the description. They 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, and therefore should not be construed as a limitation of this application.

[0033] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] This application provides a battery string 100 processing equipment and a battery string 100, which solves the technical problem of low processing quality of the battery string 100 processing equipment and achieves the technical effect of improving the processing quality of the battery string 100 processing equipment.

[0035] To better understand the above technical solutions, a detailed description of the technical solutions will be provided below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit the scope of this application.

[0036] This application proposes a battery string 100 processing equipment for processing the battery string 100. It should be noted that, Figure 1 , 2 As shown, the battery string 100 to be processed includes several battery cells 110. Parallel solder ribbons 120 are arranged on each battery cell 110. The solder ribbons 120 and the battery cells 110 are electrically connected by means of bonding or welding. Due to gaps between the battery cells 110, excess solder ribbons 120 are formed between them. The solder ribbons 120 need to be processed according to process requirements to ensure that the battery string 100 meets the process requirements. The solder ribbons 120 cut between the battery cells 110 according to preset requirements are defined as processing segments 121, where the cutting requirements are:

[0037] like Figure 3 , 4 As shown, specifically, the solder ribbons 120 between the battery cells 110 need to be interrupted at intervals. In other words, the battery cells 110 are arranged with at least the nth, (n+1)th, and (n+2)th solder ribbons. Based on the processing technology: the odd-numbered solder ribbons 120 between the nth and (n+1)th battery cells 110 are interrupted, and the even-numbered solder ribbons 120 are retained; the even-numbered solder ribbons 120 between the (n+1)th and (n+2)th battery cells 110 are interrupted, and the odd-numbered solder ribbons 120 are retained; or,

[0038] Based on the processing technology: the even-numbered solder strips 120 between the nth and (n+1)th solar cells 110 are broken, while the odd-numbered solder strips 120 are retained; the odd-numbered solder strips 120 between the (n+1)th and (n+2)th solar cells 110 are broken, while the even-numbered solder strips 120 are retained. It can be understood that the distinction between odd-numbered and even-numbered solder strips 120 is intended to form the positive and negative electrodes.

[0039] It should be noted that the welding strip 120 cut between the battery cells 110 based on preset requirements is defined as the processing segment 121. The cutting requirement is the welding process mentioned above. In other words, the processing segment 121 refers to the welding strip 120 between the battery cells 110. The battery string 100 processing equipment proposed in this application is mainly used for processing the processing segment 121, and has completed the cutting and spraying of insulating adhesive on the processing segment 121.

[0040] The battery string 100 processing equipment proposed in this application is used to process the solder strip 120 (i.e., processing section 121) between battery cells 110, especially the processes of cutting the solder strip 120 and spraying insulating adhesive. Figure 5 As shown, the battery string 100 processing equipment includes a carrying mechanism 200, a vision mechanism 300, a cutting mechanism 400, an air blowing mechanism 500, an adhesive coating mechanism 600, and a curing mechanism 700. The carrying mechanism 200 is used to carry the battery string 100, and the carrying mechanism 200 has a degree of freedom of movement, so that the battery string 100 can be imaged and positioned under the vision mechanism 300, the welding strip 120 can be cut on the cutting mechanism 400, the cutting welding strip 120 can be removed by blowing air on the air blowing mechanism 500, the insulating adhesive can be sprayed on the adhesive coating mechanism 600, and the insulating adhesive can be cured on the curing mechanism 700.

[0041] Generally, the battery string 100 is cut and then coated with adhesive under the drive of the carrying mechanism 200. First, the battery string 100 is positioned by the vision mechanism 300 to determine its position information, thereby ensuring the accuracy of the subsequent cutting and coating processes. After positioning, the battery string 100 passes through the cutting mechanism 400, the air blowing mechanism 500, the adhesive coating mechanism 600, and the curing mechanism 700 in sequence. The processing section 121 is on the cutting mechanism 400, which cuts the solder strip 120 of the processing section 121. Simultaneously or subsequently, the processing section 121 is on the air blowing mechanism 500, which blows away the cut solder strip 120 debris. Next, the processing section 121 moves to the adhesive coating mechanism 600, which applies adhesive to the ends 1211 formed by the broken solder strip 120 within the processing section 121. Then, the battery string 100 moves to the curing mechanism 700, which cures the insulating adhesive.

[0042] Alternatively, the battery string 100 can be glued and then cut under the drive of the support mechanism 200. First, the battery string 100 is positioned using a vision mechanism 300 to determine its location, ensuring the accuracy of subsequent cutting and gluing processes. After positioning, the battery string 100 passes sequentially through a gluing mechanism 600, a cutting mechanism 400, an air blowing mechanism 500, and a curing mechanism 700. The processing section 121 moves to the gluing mechanism 600, where insulating adhesive is sprayed onto the welding strip 120 within the processing section 121, covering the entire welding strip 120. Next, the processing section 121 moves to the cutting mechanism 400, where the welding strip 120 is cut. Simultaneously or subsequently, the processing section 121 passes to the air blowing mechanism 500, which blows away the cut welding strip 120 debris. Finally, the battery string 100 moves to the curing mechanism 700, where the insulating adhesive is cured.

[0043] It is understood that, since the battery string 100 has a certain length, the processing section 121 performs the process sequentially in the above-mentioned mechanisms, and the battery string 100 may be located on both the cutting mechanism 400 and the gluing mechanism 600 at the same time. On the battery string 100, the processing section 121 at the front performs gluing, while the processing section 121 at the rear performs cutting.

[0044] like Figure 5 , 6As shown, the support mechanism 200 is used to support the battery string 100. The support mechanism 200 has a degree of freedom of movement to drive the battery string 100 to move. In one embodiment, the support mechanism 200 can be driven in a linear direction by a conveyor belt, cylinder, electric cylinder, etc. Specifically, the support mechanism 200 includes a support base 210, which has a horizontally arranged support surface 220. The support surface 220 can support the battery string 100, and the support surface 220 has an adsorption capacity to fix the battery string 100 and prevent it from moving during processing and movement.

[0045] like Figure 5 As shown, the vision mechanism 300 is used to acquire the position information of the battery string 100 to locate it, providing precise data support for subsequent cutting and gluing operations. The vision mechanism 300 can use cameras, sensors, etc. for real-time monitoring and feedback to ensure the accuracy and stability of the operation process. Furthermore, the direction of movement of the battery string 100 is defined as the working direction, that is, the battery string 100 moves along the working direction. Multiple vision mechanisms 300 can be set up. In the working direction, the vision mechanisms 300 are respectively set before the cutting mechanism 400 and the gluing mechanism 600, so that the processing section 121 is accurately positioned before cutting and gluing.

[0046] like Figure 5 , 7 As shown, the cutting mechanism 400 is used to cut the processing section 121 on the battery string 100 according to cutting requirements, causing the welding strip 120 within the processing section 121 to break. The cutting mechanism 400 includes a cutting seat 410 and a cutting element 420. The cutting seat 410 is used to support the cutting element 420, and the cutting element 420 is connected to the cutting seat 410. In one embodiment, the cutting element 420 is a laser-cutting element 420. The cutting seat 410 has a vertical degree of freedom of movement perpendicular to the working direction, so as to drive the cutting element 420 to move on a path perpendicular to the moving direction of the battery string 100, thereby achieving precise cutting of the welding strip 120. The design of the cutting element 420 can be adjusted according to actual processing requirements to ensure the stability and efficiency of the cutting process.

[0047] It should be noted that after the cutting part 420 cuts the welding strip 120 in the processing section 121, the welding strip 120 breaks to form an end 1211. The end 1211 is then coated with insulating glue in a subsequent glue application operation to prevent the end 1211 from bending and causing a short circuit.

[0048] The air blowing mechanism 500 is located on one side of the cutting mechanism 400 and is used to blow air to remove the cut solder strip 120. The air blowing mechanism 500 can keep the working area clean and prevent the residue of the cut solder strip 120 from interfering with subsequent processing. Furthermore, the moving direction of the battery string 100 is defined as the working direction, and the air blowing mechanism 500 is placed on one side of the cutting mechanism 400 in the working direction and is arranged adjacent to the cutting mechanism 400. In this way, the air blowing mechanism 500 can blow air on the cut solder strip 120 after the cutting operation is completed to remove the waste or excess parts generated during cutting.

[0049] Furthermore, such as Figure 7 As shown, the air blowing mechanism 500 includes an air blowing seat 510 and an air knife 520. The air blowing seat 510 is the supporting part of the air blowing mechanism 500, used to fix and support the air knife 520, ensuring that the air knife 520 can work stably. The air blowing seat 510 may also include an interface for connecting to an air source to provide the airflow required for blowing. The air knife 520 has an air outlet; the air outlet is designed to be inclined so as to face the movement path of the battery string 100. The inclined air outlet design can ensure that the blown airflow can act on the cut welding strip 120 at an appropriate angle and force, thereby effectively blowing away the welding strip 120 waste.

[0050] like Figure 5 , 8 As shown, the adhesive application mechanism 600 is used to insulate the ends 1211 of the cut solder strip 120 or to spray insulating adhesive onto the entire section of the cut solder strip 120. The spraying mechanism includes an adhesive application base 610 and an adhesive application component 620; the adhesive application component 620 can spray insulating adhesive, while the adhesive application base 610 can flexibly adjust the position of the adhesive application component 620 to ensure uniform and accurate adhesive application onto the solder strip 120. The design of the adhesive application mechanism 600 makes the insulation process more efficient and reliable; the adhesive application component 620 is rotatably connected to the adhesive application base 610, allowing the position of the adhesive application component 620 to be adjusted. In one embodiment, a motor is provided on the adhesive application base 610, and the motor acts on the adhesive application component 620 to drive the adhesive application component 620 to rotate. The adhesive application base 610 has a degree of freedom of movement perpendicular to the working direction of the battery string 100, allowing the adhesive application base 610 to drive the adhesive application component 620 to perform a more precise adhesive application operation on the battery string 100. In one embodiment, the adhesive applicator 620 is a dispensing valve connected to an external supply. For example... Figure 9 , 10 As shown, after applying adhesive, an insulating element 1212 is formed on the end 1211 of the solder ribbon 120 to prevent the solder ribbon 120 from bending and causing a short circuit.

[0051] It should be noted that the adhesive applicator 620 is used to spray insulating adhesive onto the uncut solder strip 120 within the processing section 121; or, the adhesive applicator 620 is used to spray insulating adhesive onto the end portion 1211 formed after cutting the solder strip 120 within the processing section 121. In other words, in the working direction of the battery string 100, the adhesive applicator 600 can be located at the rear end of the cutting mechanism 400, and the execution process is cutting first, then applying adhesive; the adhesive applicator 600 can also be located at the front end of the cutting mechanism 400, and the execution process is applying adhesive first, then cutting.

[0052] like Figure 11 As shown, the curing mechanism 700 is used to cure the insulating adhesive on the cut and glued solder strip 120. The curing mechanism 700 ensures the curing effect of the insulating adhesive, thereby improving the safety and reliability of the battery string 100. In one embodiment, the curing mechanism 700 can be cured by ultraviolet light. The curing mechanism 700 is located at the end of the processing equipment described in this application, and the processed area (battery string 100) after cutting and glue application is cured in the curing mechanism 700.

[0053] This application also provides a battery string 100 structure, which is manufactured using the aforementioned battery string 100 processing equipment, such as... Figure 3 , 4 As shown, the battery string 100 includes several battery cells 110, which are connected by solder ribbons 120. Depending on the processing requirements, the solder ribbons 120 in the battery string 100 can be connected in two different ways: an odd number of solder ribbons 120 are connected, and an even number of solder ribbons 120 are broken to form ends 1211, with insulating adhesive applied to the ends 1211; or an even number of solder ribbons 120 are connected, and an odd number of solder ribbons 120 are broken to form ends 1211, with insulating adhesive also applied to the ends 1211.

[0054] Furthermore, parallel-arranged solder ribbons 120 are provided on the battery cell 110. The solder ribbons 120 and the battery cell 110 can be electrically connected by means of bonding or welding. Due to the gaps between the battery cells 110, excess solder ribbons 120 are formed between the battery cells 110. The solder ribbons 120 need to be processed according to process requirements to ensure that the battery string 100 meets the process requirements. The solder ribbons 120 cut between the battery cells 110 according to preset requirements are defined as processing segments 121, wherein the cutting requirements are:

[0055] Specifically, the solder ribbons 120 between the battery cells 110 need to be interrupted at intervals. In other words, the battery cells 110 are arranged with at least the nth, (n+1th), and (n+2th)th solder ribbons. Based on the manufacturing process: the odd-numbered solder ribbons 120 between the nth and (n+1th)th battery cells 110 are interrupted, and the even-numbered solder ribbons 120 are retained; the even-numbered solder ribbons 120 between the (n+1th)th and (n+2th)th battery cells 110 are interrupted, and the odd-numbered solder ribbons 120 are retained, where n is a positive integer; or,

[0056] Based on the manufacturing process: the even-numbered solder strip 120 between the nth and (n+1)th solar cells 110 is broken, retaining the odd-numbered solder strip 120; the odd-numbered solder strip 120 between the (n+1)th and (n+2)th solar cells 110 is broken, retaining the even-numbered solder strip 120, where n is a positive integer. It can be understood that the distinction between odd-numbered and even-numbered solder strips 120 is intended to form the positive and negative electrodes.

[0057] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0058] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A battery string processing apparatus, characterized by, The application relates to a battery string (100) processing device, the battery string (100) has welding strips (120) between battery pieces (110), the welding strip (120) cut based on preset requirements between the battery pieces (110) is defined as a processing section (121), and the device comprises the following: a cutting mechanism (400) comprising: a cutting piece (420) used for cutting the welding strip (120) of the processing section (121), and the welding strip (120) is formed with an end portion (1211) after being cut; a gluing mechanism (600) comprising: a gluing piece (620) used for spraying insulating glue on the welding strip (120) not cut in the processing section (121) or on the end portion (1211) formed after the welding strip (120) is cut in the processing section (121); and a bearing mechanism (200) used for bearing the battery string (100), the bearing mechanism (200) has a movement degree of freedom, so that the bearing mechanism (200) can drive the battery string (100) to move, so that the cutting piece (420) can cut the welding strip (120) in the processing section (121), and the gluing piece (620) can spray insulating glue on the welding strip (120) or the end portion (1211) in the processing section (121).

2. The battery string processing apparatus according to claim 1, wherein The gluing mechanism (600) further comprises: a gluing seat (610), and the gluing piece (620) is rotationally connected to the gluing seat (610), so that the gluing piece (620) can be rotationally adjusted.

3. The battery string processing apparatus of claim 2, wherein The moving direction of the battery string (100) is defined as a working direction, the gluing seat (610) has a movement degree of freedom perpendicular to the working direction, so as to drive the gluing piece (620) to adjust the position.

4. The battery string processing apparatus of claim 1, wherein The moving direction of the battery string (100) is defined as a working direction, and the cutting mechanism (400) further comprises: a cutting seat (410) having a movement degree of freedom perpendicular to the working direction, so as to drive the cutting piece (420) to adjust the position.

5. The battery string processing apparatus according to claim 1 or 4, wherein The moving direction of the battery string (100) is defined as a working direction, and the battery string (100) processing device further comprises a blowing mechanism (500) located on one side of the cutting mechanism (400) in the working direction, and the blowing mechanism (500) is arranged adjacent to the cutting mechanism (400), so that the blowing mechanism (500) can blow the welding strip (120) after being cut to remove.

6. The battery string processing apparatus of claim 5, wherein The blowing mechanism (500) comprises: a blowing seat (510); a wind knife (520) having an air outlet, and the air outlet is obliquely arranged to face the moving path of the battery string (100).

7. The battery string processing apparatus of claim 1, wherein The bearing mechanism (200) comprises: The bearing seat (210) has a bearing surface (220) for bearing the battery string (100), and the bearing surface (220) has a adsorption function to adsorb and fix the battery string (100).

8. The battery string processing apparatus of claim 1, wherein, The curing mechanism (700) is further included for curing the insulating glue on the cut and glued welding strip (120).

9. The battery string processing apparatus of claim 1, wherein, The visual mechanism (300) is further included for acquiring the position information of the battery string (100).

10. A battery string, characterized by The battery string (100) includes a plurality of battery pieces (110) connected by welding strips (120), wherein the welding strips (120) arranged in odd numbers are connected, the welding strips (120) arranged in even numbers are broken and formed with end portions (1211), the end portions (1211) are provided with insulating glue, and n is a positive integer. The welding strips (120) arranged in even numbers are connected, the welding strips (120) arranged in odd numbers are broken and formed with end portions (1211), the end portions (1211) are provided with insulating glue, and n is a positive integer.

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