A welding strip pressing device and battery string welding equipment

Abstract

This invention relates to the field of battery cell welding technology, and more particularly to a strip clamping device and a battery stringing equipment. The strip clamping device includes a pressure head mounting frame and multiple pressure head assemblies. Each pressure head assembly includes a mounting shaft and a pressure head. Multiple mounting shafts are spaced apart on the pressure head mounting frame, and a pressure head is fitted onto the end of each mounting shaft. The pressure head can float and deflect relative to the mounting shaft. The pressure head mounting frame can synchronously drive each pressure head assembly downwards, so that the pressure head presses against the strip, simultaneously clamping multiple strips. The pressure head's ability to float and deflect relative to the mounting shaft allows it to compensate for downward pressure deviations. Furthermore, the pressure head can accommodate various specifications of strips, and through deflection adjustment, it has the ability to simultaneously clamp two strips, meeting the clamping requirements of small-pitch strips. The application of this strip clamping device in battery stringing equipment improves the applicability of the equipment and meets the welding requirements of small-pitch, multi-grid battery cells.

Description

Technical Field

[0001] This invention relates to the field of battery cell welding technology, and in particular to a welding strip pressing device and battery string welding equipment. Background Technology

[0002] With the continuous advancement of solar cell and module technology, solar cells have gradually evolved from having three or four main grid lines to having more grid lines with smaller spacing. When multi-grid solar cells are connected in series, a number of solder ribbons corresponding to the grid lines are required. In other words, when welding solar cells, the solar cell stringing equipment needs to process a larger number of solder ribbons at the same time.

[0003] The welding strip feeding section typically includes a welding strip shaping mechanism. This mechanism straightens multiple welding strips to meet welding requirements. The shaping mechanism includes a welding strip clamping device with multiple pressure heads spaced apart. Each pressure head is positioned opposite one welding strip, and the heads press down synchronously, clamping multiple welding strips simultaneously. However, errors can occur during the manufacturing and installation of the welding strip clamping device, and it is prone to wear over long-term use. This can lead to inaccurate pressure from the pressure heads onto the corresponding welding strips. Furthermore, the varying spacing between welding strips of different specifications makes it impossible for the clamping device to adequately compress welding strips of different sizes. Furthermore, as the number of grid lines increases, the grid spacing of the solar cell decreases relatively, meaning the distance between two adjacent solder strips decreases. Since the width of each pressure head is greater than the width of the solder strip, the solder strip pressing device cannot meet the pressure requirements of small-pitch solder strips, thus making the battery stringing equipment unable to meet the welding requirements of small-pitch, multi-grid solar cells.

[0004] Therefore, there is an urgent need to invent a battery stringing device to solve the above problems. Summary of the Invention

[0005] One object of the present invention is to provide a welding strip pressing device, which enables the pressing head to compensate for the downward pressure deviation, and the pressing head can be matched with a variety of welding strips of different specifications. Furthermore, the pressing head has the ability to press two welding strips simultaneously, thereby meeting the pressing requirements of small-pitch welding strips.

[0006] Another objective of this invention is to provide a battery stringing equipment that enables the pressure head to compensate for downward pressure deviation, improves the applicability of the battery stringing equipment, and enables the battery stringing equipment to meet the welding requirements of small-pitch, multi-grid battery cells.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A welding strip pressing device, comprising:

[0009] Pressure head mounting bracket; and

[0010] Multiple pressure head assemblies are provided, each of which includes a mounting shaft and a pressure head. The mounting shafts are spaced apart on the pressure head mounting frame, and a pressure head is fitted at the end of each mounting shaft. The pressure head can float and deflect relative to the mounting shaft. The pressure head mounting frame can synchronously drive each pressure head assembly to press down so that the pressure head presses against the welding strip.

[0011] As a preferred embodiment, a snap ring is provided on the outer peripheral wall of the mounting shaft, a snap groove is provided on the pressure head, an overlapping ring is provided on the groove wall of the snap groove, the snap ring is accommodated in the snap groove, a floating gap h exists between the end of the mounting shaft and the bottom wall of the snap groove, and the overlapping ring overlaps on the snap ring.

[0012] As a preferred embodiment, when the pressure head assembly is in a natural vertical state, the floating gap h between the end of the mounting shaft and the bottom wall of the snap-fit ​​groove is greater than or equal to 0.2 mm and less than or equal to 3 mm.

[0013] As a preferred embodiment, each of the pressure head assemblies further includes:

[0014] An elastic element is provided between each of the mounting shafts and the pressure head mounting bracket.

[0015] As a preferred embodiment, the pressure head mounting bracket is provided with a plurality of through holes spaced apart, and each through hole has a receiving groove on its wall. The outer peripheral wall of the mounting shaft is provided with a limiting shoulder. The mounting shaft is movably inserted into each through hole. The elastic element is located in the corresponding receiving groove and sleeved on the corresponding mounting shaft, and both ends of the elastic element abut against the corresponding limiting shoulder and the bottom wall of the receiving groove, respectively.

[0016] As a preferred embodiment, the welding strip clamping device further includes:

[0017] A limiting component is installed on the pressure head mounting bracket. The limiting component can abut against the limiting shoulder to limit the downward movement of the mounting shaft relative to the pressure head mounting bracket.

[0018] As a preferred embodiment, the welding strip clamping device further includes:

[0019] A drive assembly, the output of which is connected to the pressure head mounting bracket, the drive assembly being configured to drive the pressure head mounting bracket to move up and down relative to the welding strip.

[0020] As a preferred embodiment, the welding strip clamping device further includes:

[0021] A mounting bracket, on which the drive assembly is mounted; and

[0022] At least two guide shafts are symmetrically fixed on the fixed frame, the guide shafts extend in the vertical direction, and the two ends of the pressure head mounting frame are slidably sleeved on the guide shafts on the corresponding sides.

[0023] As a preferred embodiment, the fixing frame includes:

[0024] A fixing plate on which the drive assembly and the guide shaft are mounted;

[0025] Connecting side plates, both ends of the fixing plate are connected to the connecting side plates; and

[0026] A base is disposed below the pressure head assembly. A pad is detachably mounted on the base. The pad is disposed opposite to a plurality of pressure head assemblies. The pad is used to place the welding strip. The base is located between the connecting side plates and its two ends are detachably connected to the connecting side plates. The pressure head mounting bracket and the pressure head assembly are both located within the space enclosed by the fixing plate, the connecting side plates, and the base.

[0027] A battery stringing apparatus includes a strip pressing device as described above.

[0028] The beneficial effects of this invention are:

[0029] The welding strip clamping device provided by this invention arranges multiple mounting shafts spaced apart on a pressure head mounting frame, with a pressure head fitted at the end of each mounting shaft. This allows the welding strip clamping device to simultaneously clamp multiple welding strips via the pressure heads as the pressure head mounting frame moves downward. Furthermore, the pressure heads can float and deflect relative to the mounting shafts. Even if the pressure head initially contacts the side of the welding strip during the downward pressure, it can still float and deflect relative to the mounting shaft under the downward pressure, ensuring stable pressure against the welding strip and compensating for any downward pressure deviation. This also allows the pressure head to accommodate various welding strip specifications, and the deflection adjustment during downward pressure enables simultaneous clamping of two welding strips, meeting the clamping requirements of a larger quantity and multiple small-pitch welding strips.

[0030] The battery stringing equipment provided by the present invention, by applying the above-mentioned welding strip pressing device, compensates for the downward pressure deviation of the pressure head, improves the applicability of the battery stringing equipment, and enables the battery stringing equipment to meet the welding requirements of small-pitch, multi-grid battery cells. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the welding strip pressing device provided in an embodiment of the present invention;

[0032] Figure 2This is a cross-sectional view of the welding strip pressing device provided in an embodiment of the present invention;

[0033] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0034] Figure 4 yes Figure 2 A magnified view of a section at point B in the middle.

[0035] In the picture:

[0036] 1. Pressure head mounting bracket; 11. Through hole; 111. Receiving groove;

[0037] 2. Pressure head assembly; 21. Mounting shaft; 211. Snap-fit ​​ring; 212. Limiting shoulder; 22. Pressure head; 221. Snap-fit ​​groove; 2211. Overlap ring; 23. Elastic element;

[0038] 3. Drive assembly; 31. Drive component; 32. Connector; 321. Mounting slot;

[0039] 4. Fixing bracket; 41. Fixing plate; 42. Connecting side plate; 43. Base; 431. Pad; 44. Screws;

[0040] 5. Guide shaft; 51. Guide shaft body; 52. Mounting bushing; 53. Limit nut;

[0041] 6. Limiting assembly; 61. Limiting bolt. Detailed Implementation

[0042] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0043] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and 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. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0046] Existing ribbon clamping devices have multiple pressure heads spaced apart, each facing a single ribbon. These heads press down synchronously to clamp multiple ribbons simultaneously, enabling straightening and meeting the welding requirements of multi-busbar solar cells. However, errors can occur during manufacturing and installation, and wear can lead to inaccurate pressure from the pressure heads onto the corresponding ribbons. Furthermore, the varying spacing between ribbons of different specifications makes it impossible to apply sufficient pressure to ribbons of different sizes. Additionally, as the number of busbars increases, the grid spacing decreases, meaning the distance between adjacent ribbons decreases. Since the width of each pressure head is greater than the width of the ribbon, the clamping device cannot adequately press down on small-pitch ribbons, thus preventing the battery stringing equipment from meeting the welding requirements of small-pitch, multi-busbar solar cells.

[0047] To solve the above problems, such as Figure 1As shown, this embodiment provides a welding strip pressing device, which includes a pressure head mounting frame 1 and multiple pressure head assemblies 2. Each pressure head assembly 2 includes a mounting shaft 21 and a pressure head 22. The multiple mounting shafts 21 are spaced apart on the pressure head mounting frame 1, and a pressure head 22 is fitted at the end of each mounting shaft 21. The pressure head 22 can float and deflect relative to the mounting shaft 21. The pressure head mounting frame 1 can synchronously drive each pressure head assembly 2 to press down, so that the pressure head 22 presses against the welding strip. By arranging multiple mounting shafts 21 spaced apart on the pressure head mounting frame 1, and each mounting shaft 21 having a pressure head 22 fitted at its end, the welding strip pressing device can synchronously press multiple welding strips through the pressure heads 22 during the downward movement of the pressure head mounting frame 1. Furthermore, the pressure head 22 can float and deflect relative to the mounting shaft 21, so that even if the pressure head 22 contacts the side of the welding strip first during the pressing process, the pressure head 22 can still float and deflect relative to the mounting shaft 21 under the action of the downward pressure, ensuring that the pressure head 22 can firmly press the welding strip, thereby compensating for the downward pressure deviation of the pressure head 22, and enabling the pressure head 22 to match a variety of welding strips of different specifications. Moreover, the pressure head 22 can be deflected and adjusted during pressing to have the ability to press two welding strips at the same time, so as to meet the pressing requirements of more quantities and multiple small-pitch welding strips.

[0048] In addition, such as Figure 1 As shown, the welding strip pressing device provided in this embodiment also includes a drive component 3. The output end of the drive component 3 is connected to the pressure head mounting frame 1, and the drive component 3 can drive the pressure head mounting frame 1 to rise and fall relative to the welding strip. This allows multiple pressure head assemblies 2 to be driven to rise and fall simultaneously with only one drive component 3, thereby realizing the pressing down and rising reset process of the pressure head assembly 2. It is not necessary to match a drive component 3 for each pressure head assembly 2, thus reducing the number of drive components 3, saving space, and reducing the cost of the welding strip pressing device, making it suitable for multi-grid operation.

[0049] Specifically, the drive assembly 3 provided in this embodiment includes a drive component 31 and a connecting seat 32. The connecting seat 32 is fixed on the pressure head mounting frame 1, and the output end of the drive component 31 is connected to the connecting seat 32. The drive component 31 drives the pressure head mounting frame 1 to rise and fall through the connecting seat 32. The drive component 31 can be a drive cylinder, which has the advantages of reliable operation and easy installation and control. Preferably, the connecting seat 32 has a mounting groove 321, and the output end of the drive component 31 is snapped into the mounting groove 321, so that the connection between the output end of the drive component 31 and the connecting seat 32 can allow for a certain installation error, making the installation more convenient.

[0050] In this embodiment, as Figure 1 and Figure 2As shown, the welding strip clamping device also includes a fixed frame 4 and two guide shafts 5. The driving component 31 is mounted and fixed on the fixed frame 4, and the two guide shafts 5 are symmetrically fixed on the fixed frame 4, extending vertically. The two ends of the pressure head mounting frame 1 are slidably sleeved on the corresponding guide shafts 5. By providing two guide shafts 5, a guiding function is provided for the lifting and sliding of the pressure head mounting frame 1, ensuring that the lifting and sliding of the pressure head mounting frame 1 with respect to each pressure head assembly 2 is more reliable and stable. It should be noted that in other embodiments, a greater number of guide shafts 5 can be provided.

[0051] Preferably, such as Figure 1 and Figure 2 As shown, each guide shaft 5 includes a guide shaft body 51, a mounting sleeve 52, and a limiting nut 53. The mounting sleeve 52 is fixed to the fixing frame 4, and the guide shaft body 51 is fixed to the mounting sleeve 52. The limiting nut 53 is screwed onto the end of the guide shaft body 51. The pressure head mounting bracket 1 is slidably sleeved on the guide shaft body 51, and the pressure head mounting bracket 1 is located between the limiting nut 53 and the mounting sleeve 52. By setting the mounting sleeve 52 and the limiting nut 53, it is ensured that the pressure head mounting bracket 1 can only slide between the limiting nut 53 and the mounting sleeve 52 under the drive of the drive component 31, providing a mechanical limit for the lifting and lowering of the pressure head mounting bracket 1, and ensuring that the lifting and lowering adjustment of the pressure head mounting bracket 1 is more reliable. In addition, by setting the mounting sleeve 52, the stability and reliability of the installation and fixing of the guide shaft 5 and the fixing frame 4 are also greatly increased.

[0052] Combination Figure 1 and Figure 2 The specific structure of the fixing frame 4 is described below, such as Figure 1 and Figure 2 As shown, the mounting bracket 4 includes a mounting plate 41, connecting side plates 42, and a base 43. The mounting plate 41 is equipped with a drive component 31 and a mounting bushing 52. Both ends of the mounting plate 41 are connected to the connecting side plates 42. The base 43 is located below the pressure head assembly 2 and the mounting plate 41. A pad 431 is detachably mounted on the base 43, facing multiple pressure head assemblies 2. The pad 431 is used to hold multiple welding strips to be pressed. The base 43 is located between the connecting side plates 42, and its two ends are detachably connected to the connecting side plates 42. This ensures that the pressure head mounting bracket 1 and the pressure head assembly 2 are both located within the space enclosed by the mounting plate 41, connecting side plates 42, and base 43, greatly improving the protection of the pressure head mounting bracket 1 and the pressure head assembly 2, and making the structure more compact and aesthetically pleasing. By using the pad 431 to hold the multiple welding strips to be pressed, a certain degree of cushioning protection is provided for the welding strips, preventing damage during the pressing process. Furthermore, by detachably connecting the base 43 to the corresponding connecting side plate 42, it is easy to disassemble the base 43 and the connecting side plate 42, thereby cleaning the pressure head assembly 2 and the pad 431.

[0053] Preferably, in this embodiment, one end of the base 43 is rotatably connected to one of the connecting side plates 42, and the other end of the base 43 is rotatably connected to the other connecting side plate 42. When it is necessary to clean the pressure head assembly 2 and the pad 431, one end of the base 43 can be detached from the corresponding connecting side plate 42, and then the base 43 can be rotated around the other connecting side plate 42 to open the space enclosed by the fixing frame 4, which is convenient to operate.

[0054] Specifically, in this embodiment, the fixing frame 4 also includes screws 44. Screws 44 are used to realize the rotatable connection between the base 43 and the corresponding side connecting plate 42. Both ends of the base 43 are rotatably connected to the corresponding side connecting plate 42 by screws 44, which can ensure the relative fixation between the base 43 and the connecting plate 42. Furthermore, by removing the screw 44 from one end of the base 43, the base 43 can rotate around the screw 44 at the other end.

[0055] Preferably, such as Figure 2 and Figure 3 As shown, a snap-fit ​​ring 211 is provided on the outer peripheral wall of the mounting shaft 21, and a snap-fit ​​groove 221 is provided on the pressure head 22. An overlapping ring 2211 is provided on the groove wall of the snap-fit ​​groove 221, and the snap-fit ​​ring 211 is accommodated in the snap-fit ​​groove 221. There is a floating gap h between the end of the mounting shaft 21 and the bottom wall of the snap-fit ​​groove 221, and the overlapping ring 2211 overlaps the snap-fit ​​ring 211, so that after the pressure head 22 is sleeved on the end of the mounting shaft 21, the pressure head 22 can float and deflect relative to the mounting shaft 21 under the action of external extrusion force. Furthermore, the above arrangement allows the pressure head 22 to deflect in three independent directions relative to the mounting shaft 21, ensuring the flexibility of the pressure head 22 adjustment. Preferably, the pressure head 22 can be made of silicone or rubber to ensure that the pressure head 22 has a certain elasticity, making it easy to put the pressure head 22 on the mounting shaft 21, and also avoiding the pressure head 22 rigidly pressing against the welding strip, which greatly improves the protection of the welding strip.

[0056] Preferably, in this embodiment, such as Figure 3 As shown, when the pressure head assembly 2 is in a natural vertical state, the floating gap h between the end of the mounting shaft 21 and the bottom wall of the locking groove 221 is greater than or equal to 0.2 mm and less than or equal to 3 mm, thereby ensuring the flexibility of the floating deflection adjustment of the pressure head 22. Furthermore, in this embodiment, the outer diameter of the mounting shaft 21 where the pressure head 22 is mounted is a, the outer diameter of the locking ring 211 is c, and the inner diameter of the overlapping ring 2211 is b. Therefore, it is sufficient to ensure that a < b < c, and that the outer diameter of the locking ring 211 is c less than or equal to the inner diameter of the locking groove 221.

[0057] Preferably, such as Figure 2 and Figure 4As shown, each pressure head assembly 2 also includes an elastic element 23. An elastic element 23 is provided between each mounting shaft 21 and the pressure head mounting bracket 1, further avoiding rigid pressure between the pressure head 22 and the welding strip, and providing a buffering force for the pressure of the pressure head 22. Preferably, the elastic element 23 can be a spring, which has good elasticity and low cost.

[0058] Specifically, the pressure head mounting bracket 1 has multiple through holes 11 spaced apart, and each through hole 11 has a receiving groove 111 on its hole wall. The outer peripheral wall of the mounting shaft 21 is provided with a limiting shoulder 212. The mounting shaft 21 is movably inserted into each through hole 11. The elastic element 23 is located in the corresponding receiving groove 111 and sleeved on the corresponding mounting shaft 21. The two ends of the elastic element 23 abut against the corresponding limiting shoulder 212 and the bottom wall of the receiving groove 111, respectively, thereby preventing the elastic element 23 from coming off the mounting shaft 21. In addition, the outer diameter of the limiting shoulder 212 is matched with the inner diameter of the receiving groove 111, thus ensuring that the outer diameter of the limiting shoulder 212 is much larger than the inner diameter of the through hole 11. Furthermore, after the mounting shaft 21 passes through the receiving groove 111, a pressure head 22 is fitted on it. The design of the limiting shoulder 212 also limits the extreme position of the mounting shaft 21 moving upward, thereby preventing the mounting shaft 21 from floating upward and falling out of the through hole 11.

[0059] Furthermore, such as Figure 2 and Figure 4 As shown, the welding strip clamping device also includes a limiting component 6, which is installed on the lower end face of the pressure head mounting bracket 1. The limiting component 6 can abut against the lower end face of the limiting shoulder 212 to limit the downward movement of the mounting shaft 21 relative to the pressure head mounting bracket 1, thereby preventing the mounting shaft 21 from falling out of the through hole 11. Specifically, the limiting component 6 includes a plurality of spaced limiting bolts 61, with each pressure head 22 corresponding to one limiting bolt 61. The limiting bolts 61 are screwed onto the lower end face of the pressure head mounting bracket 1, and the screw head of the limiting bolt 61 can abut against the lower end face of the limiting shoulder 212, thereby limiting the downward movement of the mounting shaft 21 relative to the pressure head mounting bracket 1. By designing the limiting component 6 in the form of multiple limiting bolts 61, the structure is simple, and the limiting bolts 61 can be screwed onto one side of the mounting shaft 21, which facilitates installation. Preferably, a limiting bolt 61 can be provided between two adjacent mounting shafts 21. The two sides of the limiting bolt 61 can be used to limit the mounting shaft 21 on the corresponding side, making the structure more compact and reducing costs.

[0060] This embodiment also provides a battery stringing equipment. By applying the above-mentioned strip pressing device to press the strip, the downward pressure deviation of the pressure head 22 is compensated, the applicability of the battery stringing equipment is improved, and the battery stringing equipment can meet the welding requirements of small-pitch, multi-grid battery cells.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A solder strip hold-down device characterized by, The welding strip pressing device comprises: a pressing head mounting frame (1); and a plurality of pressing head assemblies (2), each of which comprises a mounting shaft (21) and a pressing head (22), a plurality of the mounting shafts (21) are arranged on the pressing head mounting frame (1) at intervals, one of the pressing heads (22) is sleeved on the end of each of the mounting shafts (21), the pressing head (22) can float and deflect relative to the mounting shaft (21), and the pressing head mounting frame (1) can drive each of the pressing head assemblies (2) to press down synchronously so that the pressing head (22) presses against a welding strip; a clamping ring (211) is arranged on the outer peripheral wall of the mounting shaft (21), a clamping groove (221) is formed in the pressing head (22), a lap joint ring (2211) is arranged on the groove wall of the clamping groove (221), the clamping ring (211) is accommodated in the clamping groove (221), and a floating gap h exists between the end of the mounting shaft (21) and the bottom wall of the clamping groove (221), and the lap joint ring (2211) is lapped on the clamping ring (211).

2. The weld strip hold down device of claim 1, wherein, When the pressing head assembly (2) is in a natural vertical state, the floating gap h between the end of the mounting shaft (21) and the bottom wall of the clamping groove (221) is greater than or equal to 0.2 mm and less than or equal to 3 mm.

3. The weld strip hold down device of claim 1, wherein, Each of the pressing head assemblies (2) further comprises: a resilient member (23), which is arranged between each of the mounting shafts (21) and the pressing head mounting frame (1).

4. The weld strip hold down device of claim 3, wherein, A plurality of through holes (11) are arranged on the pressing head mounting frame (1) at intervals, a receiving groove (111) is formed in the hole wall of each of the through holes (11), a limiting shaft shoulder (212) is arranged on the outer peripheral wall of the mounting shaft (21), the mounting shaft (21) is movably arranged in each of the through holes (11), the resilient member (23) is located in the corresponding receiving groove (111) and is sleeved on the corresponding mounting shaft (21), and the two ends of the resilient member (23) abut against the corresponding limiting shaft shoulder (212) and the bottom wall of the receiving groove (111) respectively.

5. The weld strip hold down device of claim 4, wherein, The welding strip pressing device further comprises: a limiting assembly (6) mounted on the pressing head mounting frame (1), which can abut against the limiting shaft shoulder (212) to limit the limit position of the downward movement of the mounting shaft (21) relative to the pressing head mounting frame (1).

6. The solder strip hold-down device according to any one of claims 1 to 5, characterized in that The welding strip pressing device further comprises: a driving assembly (3), the output end of which is connected with the pressing head mounting frame (1), and the driving assembly (3) is configured to drive the pressing head mounting frame (1) to ascend and descend relative to the welding strip.

7. The solder strip hold-down device of claim 6, wherein The welding strip pressing device further comprises: a fixing frame (4) on which the driving assembly (3) is mounted; and at least two guide shafts (5) which are symmetrically fixed to the fixing frame (4), extend in the vertical direction, and on which the two ends of the pressing head mounting frame (1) are slidably sleeved.

8. The solder strip hold-down device of claim 7, wherein, The fixing frame (4) comprises: A fixed plate (41) is provided with the driving assembly (3) and the guide shaft (5); A connecting side plate (42) is connected to both ends of the fixed plate (41); and A base (43) is arranged below the pressing head assembly (2), and a pad (431) is detachably arranged on the base (43). The pad (431) is arranged opposite to the plurality of pressing head assemblies (2) and used for placing the solder strip. The base (43) is located between the connecting side plates (42) and detachably connected to both ends of the connecting side plates (42). The pressing head mounting frame (1) and the pressing head assembly (2) are located in a space surrounded by the fixed plate (41), the connecting side plates (42) and the base (43).

9. A battery string welding apparatus, characterized by, The solder strip pressing device according to any one of claims 1-8.

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