Combined welding pressure head

Abstract

The utility model discloses a combined welding pressure head which comprises an integral pressure head and a plurality of separated pressure heads, a plurality of mounting notches are formed in the bottom of the integral pressure head in the circumferential direction, the separated pressure heads can be connected to the mounting notches in the manner of moving in the axial direction, and annular pressure sensors and distance sensors are mounted on the top surfaces of the mounting notches; the separating type pressing head is connected with the integral type pressing head in the mode that the separating type pressing head can move in the axial direction of a connecting bolt through the connecting bolt, the connecting bolt is sleeved with an elastic piece, and the two ends of the elastic piece abut against the top face of the mounting notch and the separating type pressing head respectively. The utility model has the beneficial effects that the gap between the aluminum bar and the nickel sheet can be compensated, the occurrence of pseudo soldering is reduced, and the welding quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a welding pressure head for compensating for the welding gap of a nickel sheet. Background Art

[0002] Nowadays, power energy batteries are developing rapidly, and competition in the lithium battery industry is becoming increasingly fierce. The development of battery pack structure has gradually become the focus of industry development. It is necessary to achieve both innovative battery pack structure and quality cost control. Under the common requirements of the two, a series of technical difficulties have emerged that need to be overcome.

[0003] At present, the welding of the top aluminum sheet and nickel sheet after the module is put into the box has gradually become one of the structural solutions for battery packs to increase costs and efficiency. However, compared with the benefits brought by this structural solution, the problems of the inclination angle of the aluminum sheet surface and the height difference of the pole caused by the uneven glue layer lead to the failure of the nickel sheet welding. Among them, the most basic and common risk of poor welding is the problem of the nickel sheet and the aluminum sheet not being able to be pressed tightly.

[0004] The conventional welding pressure head is an integral welding pressure head. The traditional welding pressure head only monitors the pressure under Hooke's law. This method will lead to the risk of deformation of the nickel sheet and the aluminum sheet during nickel sheet welding. It also leads to welding quality risks of cold welding and welding through because it cannot be pressed into place. Especially for the nickel sheet welding after the current CTP module is put into the box, it causes serious cost waste and does not conform to the current expansion of the battery pack design plan for cost reduction and efficiency improvement of nickel sheet welding.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the utility model, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to ordinary technicians in this field. Utility Model Content

[0006] The technical problem to be solved by the utility model is: how to solve the problem of how to solve the problem that the integral welding pressure head presses down to contact the aluminum sheet / nickel sheet, when the aluminum sheet itself has an inclination angle or there is a height difference between the aluminum sheets, the traditional welding pressure head pressing method will cause failure, thereby leading to the welding quality risk problem of false welding and weld penetration.

[0007] The utility model solves the above technical problems through the following technical means:

[0008] A combined welding pressure head comprises an integral pressure head and a plurality of separate pressure heads, wherein a plurality of mounting slots are provided at the bottom of the integral pressure head in a circumferential direction, the separate pressure heads are connected at the mounting slots so as to be movably axially, and an annular pressure sensor and a distance sensor are installed on the top surface of the mounting slots; the separate pressure heads are connected to the integral pressure heads via connecting bolts so as to be movably axially along the connecting bolts, an elastic member is sleeved on the outside of the connecting bolts, and the two ends of the elastic member respectively abut against the top surface of the mounting slots and the separate pressure heads.

[0009] In the utility model, firstly, downward pressure is performed by the integral pressure head, and the annular pressure sensor and the distance sensor simultaneously monitor the downward pressure process. After reaching the maximum compression amount, the separate pressure head continues to press down until the nickel sheet and the aluminum row are fitted together. The utility model achieves welding gap compensation in the nickel sheet welding process and improves the nickel sheet welding quality by monitoring the performance of the work performed by the welding pressure head during downward pressure.

[0010] Preferably, the elastic member is a compression spring, and the compression spring is sleeved on the outside of the connecting bolt.

[0011] The compression spring can provide compression force for the later gap compensation to achieve the fit between the nickel sheet and the aluminum row.

[0012] Preferably, a bolt connection hole and a cylindrical space are provided at the top of the mounting slot, the bolt connection hole and the cylindrical space are coaxially arranged, and the two form a step-like structure, the top of the connecting bolt is connected to the bolt connection hole, the annular pressure sensor is installed in the cylindrical space, and the top end of the elastic member abuts against the top surface of the cylindrical space.

[0013] The utility model adopts connecting bolts to connect and limit the separated pressure head and the integrated pressure head, so the assembly is convenient.

[0014] Preferably, a mounting groove is further provided on the side of the cylindrical space, and the distance sensor is connected in the mounting groove.

[0015] The mounting groove is used to install a distance sensor, which is used to record whether the maximum deformation of the aluminum bar has been reached.

[0016] Preferably, the separate pressure heads are arc-shaped blocks, and the outer walls of all the separate pressure heads and the outer wall of the integral pressure head substantially form a complete cylindrical surface.

[0017] The gaps between all separate pressure heads and the integral pressure head are small, so as to cover as much pressing area as possible.

[0018] Preferably, a through hole is formed axially through the interior of the separate pressure head, and a limiting step is provided at the bottom of the through hole. The connecting bolt passes through the bottom of the separate pressure head and is threadedly connected to the integral pressure head, and the nut end of the connecting bolt is limited at the limiting step.

[0019] Preferably, the top end of the elastic member abuts against the top of the installation slot, and the bottom end of the elastic member abuts against the top surface of the limiting step.

[0020] Preferably, the elastic member is a cylindrical compression block with a central portion penetrating therethrough.

[0021] Preferably, when the combined welding pressure head is not in use, the bottom end of the separate pressure head protrudes from the bottom surface of the integral pressure head, and the protruding height is the same as the height of the top surface of the separate pressure head from the bottom surface of the annular pressure sensor.

[0022] This setting is for the separation pressure head to move upward. After the top surface of the separation pressure head contacts the annular pressure sensor, the annular pressure sensor senses the pressure and starts to activate the distance sensor to record the downward distance. The design is ingenious.

[0023] Preferably, the number of the separate pressure heads is 4-12, and the separate pressure heads are arranged in a circumferential array.

[0024] The separate pressure heads are evenly arranged to cover as large an area as possible and reduce dead corners.

[0025] The advantages of the utility model are:

[0026] In the utility model, firstly, downward pressure is performed by the integral pressure head, and the annular pressure sensor and the distance sensor simultaneously monitor the downward pressure process. After reaching the maximum compression amount, the separate pressure head continues to press down until the nickel sheet and the aluminum row are fitted together. The utility model achieves welding gap compensation in the nickel sheet welding process and improves the nickel sheet welding quality by monitoring the performance of the work performed by the welding pressure head during downward pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a combined welding pressure head according to an embodiment of the utility model;

[0028] Figure 2 It is an exploded schematic diagram of a combined welding pressure head according to an embodiment of the utility model;

[0029] Figure 3 This is a front view of a combined welding pressure head according to an embodiment of the utility model;

[0030] Figure 4 yes Figure 3 Sectional view at AA;

[0031] Figure 5 This is a schematic structural diagram of an integral pressure head according to an embodiment of the utility model;

[0032] Figure 6 yes Figure 4 Enlarged view of point B in the middle;

[0033] Figure 7 This is a schematic diagram of the working of the combined welding pressure head of the utility model embodiment Figure 1 ;

[0034] Figure 8 This is a schematic diagram of the working of the combined welding pressure head of the utility model embodiment Figure 2 ;

[0035] Fig. 9 This is a schematic diagram of the working of the combined welding pressure head of the utility model embodiment Figure 3 ;

[0036] Numbers in the figure:

[0037] 1. Combined welding pressure head; 11. Integral pressure head; 111. Installation notch; 112. Bolt connection hole; 113. Cylindrical space; 114. Installation slot; 12. Separate pressure head; 13. Annular pressure sensor; 14. Distance sensor; 15. Connection bolt; 16. Compression spring;

[0038] 2. Aluminum busbar; 3. Nickel sheet. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] Embodiment 1:

[0041] A combined welding pressure head can press down the aluminum bar 2 and the nickel sheet 3 to a fitting state.

[0042] like Figure 1 , Figure 2 , Figure 5As shown, the combined welding pressure head 1 includes an integral pressure head 11 and a plurality of separate pressure heads 12. The bottom of the integral pressure head 11 is provided with a plurality of mounting notches 111 along the circumferential direction. The separate pressure head 12 is connected to the mounting notch 111 in an axially movable manner. An annular pressure sensor 13 is installed on the top surface of the mounting notch 111, and a distance sensor 14 is also installed on the top surface of the mounting notch 111. The separate pressure head 12 is connected to the integral pressure head 11 in an axially movable manner along the connecting bolt 15. A compression spring 16 is sleeved on the outside of the connecting bolt 15 so that the bottom of the separate pressure head 12 protrudes from the bottom of the integral pressure head 11.

[0043] like Figure 5 As shown, the bottom of the integral pressure head 11 is cylindrical, and the middle part is vertically penetrated. The bottom of the integral pressure head 11 is provided with a plurality of mounting slots 111 along the circumferential direction. In this embodiment, there are eight mounting slots 111, so there are also eight separate pressure heads 12, and each mounting slot 111 is configured with a separate pressure head 12. A bolt connection hole 112 is provided at the top of the mounting slot 111, and a cylindrical space 113 exists at the bolt connection hole, and the cylindrical space 113 is used to install the annular pressure sensor 13 and the abutment compression spring 16. A mounting slot 114 is also provided next to the cylindrical space 113, and the mounting slot 114 is used to connect the distance sensor 14.

[0044] refer to Figure 2 , Figure 4 , Figure 6 As shown, the separate pressure head 12 is a block structure with a certain curvature, and the outer walls of the eight separate pressure heads 12 and the outer wall of the integral pressure head 11 roughly form a complete cylindrical surface. The interior of the separate pressure head 12 is axially penetrated to form a through hole, and an annular structure protrudes inward at the bottom of the through hole to form a limiting step. The connecting bolt 15 passes through the bottom of the separate pressure head 12 and is threadedly connected to the bolt connection hole 112 of the integral pressure head 11, and the nut end of the connecting bolt 15 is limited at the limiting step. The top end of the compression spring 16 abuts against the top surface of the cylindrical space 113, and the bottom end of the compression spring 16 abuts against the top surface of the limiting step. As shown Figure 3 As shown, when the combined welding pressure head 1 is not used, the bottom end of the separate pressure head 12 protrudes from the bottom surface of the integral pressure head 11, and the protruding height H2 is the same as the height of the top surface of the separate pressure head 12 from the bottom surface H1 of the annular pressure sensor 13.

[0045] In this embodiment, the annular pressure sensor 13 can sense the pressure after contacting the top surface of the separate pressure head 12, and then transmit the signal to the distance sensor 14. The distance sensor 14 records the pressing distance and sends a signal when the maximum deformation of the aluminum sheet is reached, and the integral pressure head 11 stops pressing down.

[0046] It should be noted that: before pressing down, the maximum deformation of the aluminum row 2 needs to be set first, that is, the maximum distance recorded by the distance sensor 14 from the start of the integral pressure head to the end of the pressing down. In the actual production process, the aluminum row 2 is bulged due to the process, but the height of the bulge is uncertain, which may be 1mm, 2mm, or 3mm. However, when the height of the bulge is less than the maximum deformation, when the combined welding pressure head 1 is pressed down, the aluminum row 2 and the nickel sheet 3 can be pressed down to a fitting state directly; when the height of the bulge is greater than the maximum deformation, when the combined welding pressure head 1 is pressed down, the integral pressure head 11 and the separate pressure head 12 need to be combined and pressed down to reach the maximum deformation, and then the separate pressure head compensates for the welding gap, that is, the separate pressure head continues to press down until the aluminum row 2 and the nickel sheet 3 are pressed down to a fitting state.

[0047] That is, what is finally achieved is that the aluminum bar 2 and the nickel sheet 3 are pressed down to a bonding state.

[0048] like Figure 7 As shown, it is assumed that the aluminum row 2 protrudes 3 mm, and the maximum deformation of the aluminum row is 2 mm.

[0049] The combined welding pressure head 1 presses down, and the raised high part of the aluminum bar 2 first contacts the separate pressure head 12. The separate pressure head 12 moves upward, and H1 gradually decreases until the top surface of the separate pressure head 12 contacts the annular pressure sensor 13. Then, the pressure is sensed, and the distance sensor 14 is started to record the downward distance. The combined welding pressure head 1 continues to press down. When the pressing distance monitored by the distance sensor 14 does not reach the expansion and contraction amount of 2 mm (the maximum deformation of the aluminum bar), the pressure continues to be pressed down until the maximum deformation of the aluminum bar 2 is reached.

[0050] like Figure 8 As shown in FIG. 1 , after being pressed down to the maximum deformation of 2 mm, there is still a gap of 1 mm between the nickel sheet 3 and the aluminum row 2. Due to the existence of the connecting spring 16, there is a downward elastic force, which starts to push the lower separation pressure head 12 downward to compensate for the gap between the aluminum row 2 and the nickel sheet 3 until the gap is as shown in FIG. Fig. 9 As shown, the aluminum bar 2 and the nickel sheet 3 are bonded together.

[0051] In this embodiment, the vector of the "work" monitored by the downward pressure of the aluminum row 2 is 20-80kgf·mm, the maximum deformation of the aluminum sheet is 2mm, and the downward pressure is 10kgf-40kgf; according to the constraint conditions under the above "work" monitoring, when the integral pressure head 11 reaches the constraint conditions (the downward pressure limit of the welding pressure head), at this time, there is still a gap of 1mm in the aluminum row 2 that cannot be flattened, so the gap between the aluminum row 2 and the nickel sheet 3 is 1mm. This 1mm local gap is detected by the welding pressure head, and the separate pressure head 12 on the detection surface performs separate downward pressure, so that the nickel sheet 3 is pressed down to a fit shape with the aluminum row 2, thereby completing the gap compensation for the nickel sheet welding.

[0052] This embodiment starts from the concept of work in physics, decomposes the concept of work into pressure and displacement, and applies these two physical quantities to the welding pressure head. At the same time, the welding pressure head with these two physical quantity vector measurements has a separate telescopic performance. By monitoring the performance of work in the downward pressure of the welding pressure head, the welding gap compensation in the nickel sheet welding process is achieved, and the nickel sheet welding quality is improved. This method cleverly uses the product of pressure and displacement, combined with the universal telescopicity of the welding pressure head to achieve the compensation of the welding gap, thereby improving the nickel sheet welding quality requirements.

[0053] Embodiment 2:

[0054] In this embodiment, the compression spring 16 can be replaced by a compression block. The compression block can be a cylindrical block structure with a middle portion running through it. Of course, it can also be a structure such as an elastic sheet.

[0055] In the first and second embodiments, the number of the separate pressure heads 12 is not limited, but it is preferred that the separate pressure heads 12 are arranged in a uniform array.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A combined welding pressure head, characterized in that: It includes an integral pressure head and multiple separate pressure heads. The bottom of the integral pressure head is provided with multiple installation slots in the circumferential direction. The separate pressure head is connected at the installation slot so as to be movably axially. An annular pressure sensor and a distance sensor are installed on the top surface of the installation slot. The separate pressure head is connected to the integral pressure head through a connecting bolt so as to be movably axially along the connecting bolt. An elastic member is sleeved on the outside of the connecting bolt, and the two ends of the elastic member respectively abut against the top surface of the installation slot and the separate pressure head.

2. A combined welding pressure head according to claim 1, characterized in that: The elastic member is a compression spring, and the compression spring is sleeved on the outside of the connecting bolt.

3. A combined welding pressure head according to claim 1, characterized in that: A bolt connection hole and a cylindrical space are provided at the top of the mounting slot. The bolt connection hole and the cylindrical space are coaxially arranged and form a step-like structure. The top of the connecting bolt is connected to the bolt connection hole. The annular pressure sensor is installed in the cylindrical space, and the top end of the elastic member abuts against the top surface of the cylindrical space.

4. A combined welding pressure head according to claim 3, characterized in that: A mounting groove is also provided on the side of the cylindrical space, and the distance sensor is connected in the mounting groove.

5. The combined welding pressure head according to claim 1, characterized in that: The separate pressure heads are arc-shaped blocks, and the outer walls of all the separate pressure heads and the outer wall of the integral pressure head substantially form a complete cylindrical surface.

6. The combined welding pressure head according to claim 1, characterized in that: A through hole is formed axially through the interior of the separate pressure head, and a limiting step is provided at the bottom of the through hole. The connecting bolt passes through the bottom of the separate pressure head and is threadedly connected to the integral pressure head, and the nut end of the connecting bolt is limited at the limiting step.

7. A combined welding pressure head according to claim 6, characterized in that: The top end of the elastic member abuts against the top of the installation slot, and the bottom end of the elastic member abuts against the top surface of the limiting step.

8. The combined welding pressure head according to claim 1, characterized in that: The elastic member is a cylindrical compression block with a central portion penetrating therethrough.

9. The combined welding pressure head according to claim 1, characterized in that: When the combined welding pressure head is not in use, the bottom end of the separate pressure head protrudes from the bottom surface of the integral pressure head, and the protruding height is the same as the height of the top surface of the separate pressure head from the bottom surface of the annular pressure sensor.

10. The combined welding pressure head according to claim 1, characterized in that: The number of the separate pressure heads is 4 to 12, and the separate pressure heads are arranged in an array along a circumference.

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