Pre-welding jig

Abstract

The utility model belongs to the technical field of welding, and discloses a pre-welding jig which comprises a machine frame, a first clamp, a second clamp, a welding assembly, a first driving piece and a positioning assembly, the first clamp and the second clamp are used for clamping the two ends of a battery cell shell and are both arranged on the machine frame, and the first clamp and the second clamp are provided with a first avoiding opening and a second avoiding opening respectively. The welding assembly is used for penetrating through the first receding opening and the second receding opening to weld the battery cell shell, the first driving piece is used for driving the first clamp to rotate with the axis of the battery cell shell as the center, and the battery cell shell and the second clamp are both driven by the first clamp to synchronously rotate. The first positioning piece is provided with a positioning part and is in transmission connection with the second clamp, the first receding opening and the second receding opening are both coaxial with the positioning part, the second positioning piece can be inserted into and withdrawn from the positioning part, and the pre-welding jig can avoid the problem of welding omission at the two ends of the battery cell shell and can improve the coaxiality of pre-welding points at the two ends of the battery cell shell.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to a pre-welding jig. Background Art

[0002] When producing cylindrical battery cells, after the battery cell body is placed in the shell and the lid is closed, the cover plate and the shell need to be sealed and welded. Before sealing and welding, the cover plate and the shell are generally pre-welded to fix their position.

[0003] The existing process generally uses a laser to spot weld the circumferential edge of the cylindrical shell and the cover plate. Specifically, the active end fixture and the driven end fixture respectively clamp the two ends of the shell, and then the driving motor drives the active end fixture to rotate, and the active end fixture drives the shell and the driven end fixture to rotate together. When it rotates to the position where pre-welding is required, the driving motor stops driving, and the welding head pre-welds the shell and the cover plate.

[0004] In the above structure, the active end clamp drives the driven end clamp to rotate together through the shell. When the driving motor stops driving, the coaxiality of the two ends of the shell is low, which is prone to welding leaks during pre-welding. Even if there is no welding leak, the coaxiality of the pre-welding points at both ends of the shell is also low, thereby reducing the yield rate of the pre-welding process.

[0005] Therefore, it is urgent to propose a pre-welding fixture to solve the above technical problems. Utility Model Content

[0006] The utility model aims to provide a pre-welding jig, which can avoid the problem of welding leaks at both ends of a battery core shell and improve the coaxiality of pre-welding points at both ends of the battery core shell.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] Pre-welded jigs, including:

[0009] frame;

[0010] A first clamp and a second clamp, both of which are arranged on the frame, and are configured to clamp opposite ends of the battery core shell, respectively, and the first clamp is provided with a first avoidance opening, and the second clamp is provided with a second avoidance opening;

[0011] A welding assembly, the welding assembly is used to weld the battery core shell through the first avoidance opening and the second avoidance opening;

[0012] A first driving member, wherein a driving end of the first driving member is connected to the first clamp, and the first driving member is used to drive the first clamp to rotate around the axis of the battery cell shell, and the battery cell shell and the second clamp are driven by the first clamp to rotate synchronously;

[0013] The positioning assembly includes a first positioning member and a second positioning member, the first positioning member is transmission-connected to the second fixture, a positioning portion is provided on the first positioning member, the first avoidance opening and the second avoidance opening are both coaxially arranged with the positioning portion, and the second positioning member is configured to be able to insert into and withdraw from the positioning portion.

[0014] Optionally, the positioning assembly further includes a second driving member, a driving end of the second driving member is connected to the second positioning member, and the second driving member is used to drive the second positioning member to insert into and withdraw from the positioning portion.

[0015] Optionally, the positioning assembly also includes a first slide groove and a first slide rail that are slidably matched, one of the first slide groove and the first slide rail is set on the frame, and the other is set on the second positioning member, the second driving member is a linear driving member, and the driving direction of the second driving member is the same as the extension direction of the first slide rail.

[0016] Optionally, the positioning assembly further includes a connecting shaft, both ends of which are respectively connected to the first positioning member and the second fixture.

[0017] Optionally, at least one of the first clamp and the second clamp is a movable clamp, the movable clamp is movably connected to the frame, the movable direction of the movable clamp is parallel to the axis of the battery cell shell, and the movable direction of the movable clamp is in the direction toward and away from the battery cell shell.

[0018] Optionally, the pre-welding fixture further includes a distance measuring element, the position when the movable clamp clamps the battery cell shell is the first position, and the position when the movable clamp releases the battery cell shell is the second position, and the distance measuring element is used to measure the distance between the first position and the second position.

[0019] Optionally, the pre-welding jig further comprises a support structure, and the support structure is configured to support the battery cell shell below the battery cell shell.

[0020] Optionally, the supporting structure includes a roller group, the roller group includes two rollers, the axes of the two rollers are parallel to the axis of the battery cell shell, and the battery cell shell can be mounted between the two rollers.

[0021] Optionally, the pre-welding jig further comprises a clamping structure, which is located on a side of the battery cell shell away from the supporting structure, the clamping structure can move in a direction toward and away from the battery cell shell, and is used to press the battery cell shell onto the supporting structure.

[0022] Optionally, the clamping structure includes a fifth driving member, an elastic member and a clamping member, the fifth driving member is a linear driving member, the driving direction of the fifth driving member is the same as the deformation direction of the elastic member, and the fifth driving member is used to drive the clamping member to move in a direction toward and away from the battery cell shell;

[0023] The driving end of the fifth driving member is connected to one end of the elastic member, and the side of the pressing member facing away from the battery core shell is connected to the other end of the elastic member;

[0024] And / or, the elastic member is arranged on a side of the pressing member facing the battery cell housing.

[0025] Beneficial effects of the utility model:

[0026] The utility model provides a pre-welding jig, in which a first positioning member is transmission-connected with a second clamp, a first avoidance opening on the first clamp and a second avoidance opening on the second clamp are both coaxial with a positioning portion on the first positioning member, and when the second positioning member is inserted into the positioning portion, the first avoidance opening and the second avoidance opening have high coaxiality, thereby being able to avoid the problem of welding leaks at both ends of a battery cell shell, and after the welding assembly pre-welds the two ends of the battery cell shell through the first avoidance opening and the second avoidance opening, the coaxiality of the pre-welding points at both ends of the battery cell shell is high, thereby improving the yield rate of the pre-welding process of the battery cell shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the pre-welding fixture provided in the embodiment of the utility model. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the structure of the pre-welding fixture provided in the embodiment of the utility model. Figure 2 ;

[0029] Figure 3 It is a structural schematic diagram of a positioning assembly provided by an embodiment of the utility model;

[0030] Figure 4 yes Figure 1 A local enlarged view of point A in FIG.

[0031] Figure 5 yes Figure 3 A partial enlarged view of point B in FIG.

[0032] In the figure:

[0033] 10. Battery shell;

[0034] 110, frame; 111, third slide rail; 112, fourth slide rail; 120, first movable frame; 130, second movable frame; 140, sliding frame; 210, first clamp; 211, first avoidance opening; 220, second clamp; 221, second avoidance opening; 310, first driving member; 320, third driving member; 330, fourth driving member; 410, first positioning member; 411, positioning part; 420, second positioning member; 430, second driving member; 440, first slide rail; 450, connecting shaft; 500, distance measuring element; 610, roller; 620, second slide rail; 630, sixth driving member; 640, roller frame; 651, position detection element; 652, scale; 653, pointer; 710, fifth driving member; 720, elastic member; 730, pressing member. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] The present embodiment provides a pre-welding jig, which can avoid the problem of welding leaks at both ends of the battery core shell and improve the coaxiality of the pre-welding points at both ends of the battery core shell.

[0040] It should be noted that, in the present embodiment, the battery cell shell includes a shell and two top covers, the shell is provided with openings at both opposite ends, and the two top covers are respectively sealed at the two openings, and pre-welding of the battery cell shell refers to spot welding the edge of the shell opening with the top cover to achieve the fixing effect of the shell and the top cover before the shell and the top cover are formally welded.

[0041] Specifically, Figures 1 to 5 As shown, the pre-welding fixture includes a frame 110, a first clamp 210, a second clamp 220, a welding assembly (not shown in the figure), a first driving member 310 and a positioning assembly, wherein the first clamp 210 and the second clamp 220 are both arranged on the frame 110, the first clamp 210 and the second clamp 220 are configured to clamp the opposite ends of the battery core shell 10 respectively, the first clamp 210 is provided with a first avoidance opening 211, the second clamp 220 is provided with a second avoidance opening 221, the welding assembly is used to weld the battery core shell 10 through the first avoidance opening 211 and the second avoidance opening 221, and the first driving member The driving end of 310 is connected to the first clamp 210, and the first driving member 310 is used to drive the first clamp 210 to rotate around the axis of the battery cell shell 10, and the battery cell shell 10 and the second clamp 220 are driven by the first clamp 210 to rotate synchronously. The positioning assembly includes a first positioning member 410 and a second positioning member 420. The first positioning member 410 is transmission-connected to the second clamp 220. A positioning portion 411 is provided on the first positioning member 410. The first avoidance opening 211 and the second avoidance opening 221 are both coaxially arranged with the positioning portion 411, and the second positioning member 420 is configured to be able to insert and withdraw from the positioning portion 411.

[0042] Optionally, the positioning portion 411 may be a positioning hole or a positioning groove, depending on actual production requirements.

[0043] In the pre-welding jig provided in this embodiment, the first positioning member 410 is transmission-connected with the second clamp 220, the first avoidance opening 211 on the first clamp 210 and the second avoidance opening 221 on the second clamp 220 are both coaxial with the positioning portion 411 on the first positioning member 410, and when the second positioning member 420 is inserted into the positioning portion 411, the first avoidance opening 211 and the second avoidance opening 221 have a high coaxiality, thereby being able to avoid the problem of welding leaks at both ends of the battery cell shell 10; on the other hand, after the welding assembly pre-welds the two ends of the battery cell shell 10 through the first avoidance opening 211 and the second avoidance opening 221, the coaxiality of the pre-welding points at both ends of the battery cell shell 10 is high, thereby improving the yield rate of the pre-welding process of the battery cell shell 10.

[0044] Furthermore, if Figures 1 to 5 As shown, the positioning assembly further includes a connecting shaft 450, and both ends of the connecting shaft 450 are respectively connected to the first positioning member 410 and the second fixture 220, thereby realizing the transmission connection between the first positioning member 410 and the second fixture 220. It can be understood that in other embodiments, the first positioning member 410 can also be fixed on the second fixture 220, and the transmission connection between the first positioning member 410 and the second fixture 220 can also be realized.

[0045] Alternatively, if Figures 1 to 5 As shown, the positioning assembly also includes a second driving member 430, and the driving end of the second driving member 430 is connected to the second positioning member 420. Under the driving action of the second driving member 430, the second positioning member 420 can be inserted into and withdrawn from the positioning portion 411, thereby improving the degree of automation of the pre-welding fixture.

[0046] Preferably, if Figures 1 to 5 As shown, the positioning assembly also includes a first slide groove (not shown in the figure) and a first slide rail 440 that are slidably matched. The first slide rail 440 is arranged on the frame 110, and the first slide groove is arranged on the second positioning member 420. The second driving member 430 is a linear driving member, and the driving direction of the second driving member 430 is the same as the extension direction of the first slide rail 440, so as to achieve the guiding effect on the second positioning member 420 and improve the accuracy of the second positioning member 420 inserted into the positioning portion 411. Of course, in other embodiments, the first slide rail 440 can also be arranged on the second positioning member 420, and the first slide groove can be arranged on the frame 110, depending on the actual production needs.

[0047] Alternatively, if Figures 1 to 5 As shown, at least one of the first clamp 210 and the second clamp 220 is a movable clamp, which is movably connected to the frame 110, and the movable direction of the movable clamp is parallel to the axis of the battery cell shell 10, and the movable direction of the movable clamp is along the direction toward and away from the battery cell shell 10, so that the first clamp 210 and the second clamp 220 cooperate with each other to fix the battery cell shell 10.

[0048] Furthermore, in this embodiment, the first clamp 210 and the second clamp 220 are both movable clamps. Figures 1 to 5 As shown, the pre-welding fixture further includes a third driving member 320 and a fourth driving member 330, the driving end of the third driving member 320 is connected to the first clamp 210, and the third driving member 320 is used to drive the first clamp 210 to move in the direction toward (x2 direction) and away from (x1 direction) the battery core shell 10, so that the first clamp 210 clamps and releases the battery core shell 10, and the driving end of the fourth driving member 330 is connected to the second clamp 220, and the fourth driving member 330 is used to drive the second clamp 210 to move in the direction toward (x2 direction) and away from (x1 direction) the battery core shell 10. The second clamp 220 moves along the direction toward (x1 direction) and away from (x2 direction) the battery cell shell 10, so that the second clamp 220 clamps and releases the battery cell shell 10. When the first clamp 210 and the second clamp 220 both clamp the battery cell shell 10, the first clamp 210 and the second clamp 220 cooperate with each other to fix the battery cell shell 10. By setting the first clamp 210 and the second clamp 220 as movable clamps, the operation of clamping the battery cell shell 10 is more flexible and efficient.

[0049] It is understandable that in other embodiments, the first clamp 210 may be a movable clamp, and the second clamp 220 may be fixed on the frame 110 (i.e., the fourth driving member 330 is omitted), and only through the movement of the first clamp 210, the first clamp 210 and the second clamp 220 cooperate to fix the battery cell shell 10. Of course, the second clamp 220 may also be a movable clamp, and the first clamp 210 may be fixed on the frame 110 (i.e., the third driving member 320 is omitted), and only through the movement of the second clamp 220, the first clamp 210 and the second clamp 220 cooperate to fix the battery cell shell 10.

[0050] Preferably, if Figures 1 to 5 As shown, the pre-welding fixture also includes a distance measuring element 500. The position of the movable clamp when clamping the battery cell shell 10 is the first position, and the position of the movable clamp when releasing the battery cell shell 10 is the second position. The distance measuring element 500 is used to measure the distance between the first position and the second position (that is, the distance moved when the movable clamp moves from the second position to the first position). Since the position of the welding assembly is fixed, by observing the distance moved when the movable clamp moves from the second position to the first position, it can be judged whether the distance moved by the movable clamp is too long or too short. When the distance moved by the movable clamp is too long or too short, the battery cell shell 10 will be offset in the x1 direction or the x2 direction, thereby making the point to be welded on the battery cell shell 10 (that is, the pre-welding point) unable to be aligned with the welding assembly, affecting the pre-welding effect.

[0051] In this embodiment, the distance moved by the first clamp 210 when it moves from the second position to the first position is a fixed value (the distance value driven by the third driving member 320 to drive the first clamp 210 to move can be pre-input on the controller), the distance measuring element 500 is connected to the controller signal, and the distance measuring element 500 is used to measure the distance moved by the second clamp 220 when it moves from the second position to the first position, and the preset distance value moved by the second clamp 220 when it moves from the second position to the first position is pre-input in the controller. When the actual distance value measured by the distance measuring element 500 is equal to the preset distance value, it is regarded that the pre-welding point on the battery cell shell 10 is aligned with the welding assembly. When the actual distance value measured by the distance measuring element 500 is not equal to the preset distance value, it is regarded that the pre-welding point on the battery cell shell 10 is not aligned with the welding assembly.

[0052] It is understandable that in other embodiments, the distance moved by the second fixture 220 when it moves from the second position to the first position may be a constant, and the distance measuring element 500 is used to measure the distance moved by the first fixture 210 when it moves from the second position to the first position; or the distance measuring element 500 is used to measure the distance moved by the first fixture 210 when it moves from the second position to the first position, and the distance measuring element 500 is also used to measure the distance moved by the second fixture 220 when it moves from the second position to the first position, depending on actual production needs.

[0053] Optionally, the distance measuring element 500 is a laser distance measuring sensor. In other implementation schemes, it may be other distance measuring elements, which are not listed here one by one.

[0054] Alternatively, if Figures 1 to 5 As shown, a fourth slide rail 112 is provided on the frame 110, and a fourth slide groove (not shown in the figure) is provided on the sliding frame 140. The fourth slide rail 112 is slidably matched with the fourth slide groove. The extension direction of the fourth slide rail 112 is the same as the driving direction of the fourth driving member 330. The fixed ends of the first slide rail 440 and the second driving member 430 are both arranged on the sliding frame 140, and the driving end of the fourth driving member 330 is connected to the sliding member. When the fourth driving member 330 is started, the sliding frame 140, the second driving member 430, the first positioning member 410, the connecting shaft 450 and the second clamp 220 can move together along the driving direction of the fourth driving member 330, and the setting of the fourth slide groove and the fourth slide rail 112 plays a guiding role in the above-mentioned movement, so that the second clamp 220 can clamp the battery cell shell 10 more accurately.

[0055] Alternatively, if Figures 1 to 5As shown, the fixed end of the third driving member 320 is arranged on the frame 110, the driving end of the third driving member 320 is connected to the second movable frame 130, the fixed end of the first driving member 310 is arranged on the second movable frame 130, and the driving end of the first driving member 310 is connected to the first clamp 210, thereby, the third driving member 320 can drive the first driving member 310, the second movable frame 130 and the first clamp 210 to move along the x1 direction and the x2 direction.

[0056] Optionally, the pre-welding jig further includes a support structure, which is configured to support the battery cell case 10 below the battery cell case 10 to improve the stability of the battery cell case 10 between the first clamp 210 and the second clamp 220 .

[0057] Furthermore, if Figures 1 to 5 As shown, the supporting structure includes a roller group, which includes two rollers 610. The axes of the two rollers 610 are parallel to the axis of the battery cell shell 10, and the battery cell shell 10 can be mounted between the two rollers 610. The roller 610 can rotate around its own axis. When the battery cell shell 10 rotates under the driving action of the first driving member 310, the friction between the roller 610 and the battery cell shell 10 can be reduced.

[0058] Furthermore, if Figures 1 to 5 As shown, the roller assembly also includes a roller frame 640, and the two rollers 610 are rotatably arranged on the roller frame 640. The supporting structure also includes a sixth driving member 630, and the fixed end of the sixth driving member 630 is installed on the frame 110. The driving end of the sixth driving member 630 is connected to the roller frame 640. The sixth driving member 630 is used to drive the roller frame 640 to move in the vertical direction so that the roller 610 can be supported on the lower part of the battery cell shell 10 and the roller 610 can be separated from the battery cell shell 10.

[0059] Preferably, if Figures 1 to 5 As shown, the support structure also includes a second slide groove (not shown in the figure) and a second slide rail 620 that are slidably matched. The second slide rail 620 is arranged on the frame 110, and the second slide groove is arranged on the roller frame 640. The second slide rail 620 extends in the vertical direction to guide the movement of the roller frame 640 and the roller 610, thereby improving the reliability of supporting the battery cell shell 10. Of course, in other embodiments, the second slide rail 620 can also be arranged on the roller frame 640, and the second slide groove can be arranged on the frame 110, depending on actual production needs.

[0060] Alternatively, if Figures 1 to 5As shown, one battery cell shell 10 corresponds to two roller groups, and the two roller groups are respectively located at opposite ends of the battery cell shell 10, that is, one roller group is arranged close to the first clamp 210, and the other roller group is arranged close to the second clamp 220, so that both ends of the battery cell shell 10 can be well supported, and the stability and reliability of the support structure for the battery cell shell 10 are improved. It should be pointed out that the two roller groups corresponding to one battery cell shell 10 can be driven and connected to the same sixth driving member 630, or can be driven and connected to two sixth driving members 630 respectively, depending on production needs.

[0061] Alternatively, if Figures 1 to 5 As shown, the roller assembly also includes a position detection element 651, a scale 652 and a pointer 653, wherein the position detection element 651 can be a laser ranging sensor or a photoelectric sensor, etc. The position detection element 651 is used to detect the consistency of the distance of each rise of the roller frame 640, the scale 652 is set on the frame 110, and the pointer 653 is set on the roller frame 640, which is used to manually observe the consistency of the distance of each rise of the roller frame 640 to ensure that after the sixth driving member 630 drives the roller 610 to rise each time, the roller 610 can stably and reliably support the battery cell shell 10.

[0062] Optionally, the pre-welding jig also includes a clamping structure, which is located on the side of the battery cell shell 10 away from the supporting structure. The clamping structure can move in the direction toward (z2 direction) and away from (z1 direction) the battery cell shell 10, and the clamping structure is used to press the battery cell shell 10 against the supporting structure to improve the stability of the supporting effect of the supporting structure on the battery cell shell 10.

[0063] Preferably, if Figures 1 to 5 As shown, the clamping structure includes a fifth driving member 710, an elastic member 720 and a clamping member 730. The fifth driving member 710 is a linear driving member. The driving direction of the fifth driving member 710 is the same as the deformation direction of the elastic member 720. The fifth driving member 710 is used to drive the clamping member 730 to move in the direction toward and away from the battery cell shell 10. The driving end of the fifth driving member 710 is connected to one end of the elastic member 720, and the side of the clamping member 730 facing away from the battery cell shell 10 is connected to the other end of the elastic member 720. When the clamping member 730 is pressed on the battery cell shell 10 under the driving action of the fifth driving member 710, the elastic member 720 can play a buffering role to prevent the battery cell shell 10 from being compressed and deformed.

[0064] In another embodiment, the elastic member 720 is arranged on the side of the pressing member 730 facing the battery cell shell 10. When the pressing member 730 moves toward the direction of the battery cell shell 10 (z2 direction) under the driving action of the fifth driving member 710, the elastic member 720 first contacts the battery cell shell 10, and then the fifth driving member 710 continues to drive the pressing member 730 to move in the z2 direction. The elastic member 720 is compressed and deformed until the fifth driving member 710 stops driving. This structural setting can also reduce the probability of the battery cell shell 10 being compressed and deformed. Of course, the elastic member 720 can also be arranged on the side of the pressing member 730 facing the battery cell shell 10 and the side away from the battery cell shell 10. The two elastic members 720 simultaneously buffer the compression force of the pressing member 730 to prevent the battery cell shell 10 from being compressed and deformed.

[0065] Optionally, the elastic member 720 may be an elastic element such as a spring or rubber.

[0066] Alternatively, if Figures 1 to 5 As shown, the driving end of the fifth driving member 710 is connected to one end of the elastic member 720 through the first movable frame 120, the first movable frame 120 is provided with a third slide groove (not shown in the figure), the frame 110 is provided with a third slide rail 111, the third slide rail 111 is slidably matched with the third slide groove, and the third slide rail 111 extends in the vertical direction, playing a guiding role in the movement of the pressing member 730. Of course, in other embodiments, the third slide groove can also be set on the frame 110, and the third slide rail 111 can be set on the first movable frame 120.

[0067] Alternatively, if Figures 1 to 5 As shown, the pre-welding fixture provided in this embodiment is capable of pre-welding eight battery cell shells 10, that is, the number of the first clamps 210 and the second clamps 220 are both eight and correspond one to one with the eight battery cell shells 10. Of course, in other implementation schemes, the number of the first clamps 210 and the second clamps 220 may also be other, such as five, ten or even more, depending on actual production needs.

[0068] In this embodiment, eight pre-welding points are provided on each battery cell shell 10, and four of the eight pre-welding points are located at one end of the battery cell shell 10, and the other four are located at the other end of the battery cell shell 10. Therefore, there are four first avoidance openings 211 on the first fixture 210, four second avoidance openings 221 on the second fixture 220, and four positioning portions 411 on the first positioning member 410. The four first avoidance openings 211 are arranged at intervals along the circumference of the first fixture 210, and the four second avoidance openings 221 are arranged at intervals along the circumference of the second fixture 220. The four first avoidance openings 211 and the four second avoidance openings 221 are respectively arranged relative to a corresponding pre-welding point on the battery cell shell 10. It can be understood that when the number of pre-welding points on the battery cell shell 10 changes, the number of the first avoidance openings 211, the second avoidance openings 221, and the positioning portions 411 can be adjusted accordingly, and no further details are given here.

[0069] In this embodiment, the first driving member 310 is a motor, and the second driving member 430, the third driving member 320, the fourth driving member 330, the fifth driving member 710 and the sixth driving member 630 are all reciprocating cylinders or screw-actuated motors.

[0070] The working process of the pre-welding fixture provided in this embodiment is briefly described below:

[0071] See also Figures 1 to 5 The battery shell 10 containing the battery body is transported to the top of the roller group along the transmission chain, the sixth driving member 630 is started, the roller frame 640 moves along the z1 direction and lifts the battery shell 10, the position detection element 651 detects the rising distance of the battery shell 10, and the operator can know the rising distance of the battery shell 10 by reading the value on the scale 652.

[0072] The fifth driving member 710 is started, and the pressing member 730 moves along the z2 direction and presses the battery cell shell 10 between the two rollers 610. During this process, the elastic member 720 can be compressed and deformed to buffer the pressing force applied by the pressing member 730 to the battery cell.

[0073] The third driving member 320 is started, and the first clamp 210 moves along the x2 direction so that the first clamp 210 clamps one end of the battery cell shell 10 . The fourth driving member 330 is started, and the second clamp 220 moves along the x1 direction so that the second clamp 220 clamps the other end of the battery cell shell 10 .

[0074] The first driving member 310 is started, and the first clamp 210, the battery cell shell 10, the second clamp 220 and the first positioning member 410 rotate around the axis of the battery cell shell 10. When the battery cell shell 10 rotates to a pre-welding point, the second driving member 430 drives the second positioning member 420 to be inserted into a corresponding positioning portion 411 on the first positioning member 410. At this time, the first driving member 310 is briefly stopped, and the welding assembly welds the two ends of the battery cell shell 10 through the first avoidance opening 211 and the second avoidance opening 221 respectively (i.e., pre-welding). After welding is completed, the second driving member 430 drives the second positioning member 420 to withdraw from the positioning portion 411, and the first driving member 310 continues to drive the first clamp 210, the battery cell shell 10, the second clamp 220 and the first positioning member 410 to rotate around the axis of the battery cell shell 10 until the battery cell shell 10 rotates to the next pre-welding point, and repeats the action at the previous pre-welding point.

[0075] When all the pre-welding points on the battery cell shell 10 are welded, the first driving member 310 stops driving, the third driving member 320 drives the first clamp 210 to move along the x1 direction so that the first clamp 210 releases the battery cell shell 10, the fourth driving member 330 drives the second clamp 220 to move along the x2 direction so that the second clamp 220 releases the battery cell shell 10, the fifth driving member 710 drives the clamping member 730 to move along the z1 direction so that the clamping member 730 releases the battery cell shell 10, the sixth driving member 630 drives the roller frame 640 to move along the z2 direction so that the battery cell shell 10 falls back onto the transmission chain, and then the battery cell shell 10 is transported to the next workstation by the transmission chain.

[0076] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A pre-welding fixture, characterized in that: include: Rack (110); A first clamp (210) and a second clamp (220), wherein the first clamp (210) and the second clamp (220) are both arranged on the frame (110), the first clamp (210) and the second clamp (220) are configured to respectively clamp two opposite ends of the battery cell shell (10), the first clamp (210) is provided with a first avoidance opening (211), and the second clamp (220) is provided with a second avoidance opening (221); A welding assembly, the welding assembly being used to weld the battery core shell (10) through the first avoidance opening (211) and the second avoidance opening (221); a first driving member (310), wherein a driving end of the first driving member (310) is connected to the first clamp (210), and the first driving member (310) is used to drive the first clamp (210) to rotate around the axis of the battery cell shell (10), and the battery cell shell (10) and the second clamp (220) are both driven by the first clamp (210) to rotate synchronously; A positioning assembly, the positioning assembly comprising a first positioning member (410) and a second positioning member (420), the first positioning member (410) being transmission-connected to the second clamp (220), a positioning portion (411) being provided on the first positioning member (410), the first avoidance opening (211) and the second avoidance opening (221) being both coaxially arranged with the positioning portion (411), and the second positioning member (420) being configured to be able to be inserted into and withdrawn from the positioning portion (411).

2. The pre-welding jig according to claim 1, characterized in that: The positioning assembly further comprises a second driving member (430), a driving end of the second driving member (430) being connected to the second positioning member (420), and the second driving member (430) being used to drive the second positioning member (420) to insert into and withdraw from the positioning portion (411).

3. The pre-welding jig according to claim 2, characterized in that: The positioning assembly also includes a first slide groove and a first slide rail (440) that are slidably matched, one of the first slide groove and the first slide rail (440) is arranged on the frame (110), and the other is arranged on the second positioning member (420), the second driving member (430) is a linear driving member, and the driving direction of the second driving member (430) is the same as the extension direction of the first slide rail (440).

4. The pre-welding jig according to claim 1, characterized in that: The positioning assembly further comprises a connecting shaft (450), and two ends of the connecting shaft (450) are respectively connected to the first positioning member (410) and the second clamp (220).

5. The pre-welding jig according to claim 1, characterized in that: At least one of the first clamp (210) and the second clamp (220) is a movable clamp, the movable clamp is movably connected to the frame (110), the movable direction of the movable clamp is parallel to the axis of the battery cell shell (10), and the movable direction of the movable clamp is in a direction toward and away from the battery cell shell (10).

6. The pre-welding jig according to claim 5, characterized in that: The pre-welding jig further comprises a distance measuring element (500); the position of the movable clamp when clamping the battery cell shell (10) is a first position; the position of the movable clamp when releasing the battery cell shell (10) is a second position; and the distance measuring element (500) is used to measure the distance between the first position and the second position.

7. The pre-welding jig according to claim 1, characterized in that: The pre-welding jig further comprises a support structure, wherein the support structure is configured to support the battery cell case (10) below the battery cell case (10).

8. The pre-welding jig according to claim 7, characterized in that: The supporting structure comprises a roller group, wherein the roller group comprises two rollers (610), the axes of the two rollers (610) are parallel to the axis of the battery cell shell (10), and the battery cell shell (10) can be mounted between the two rollers (610).

9. The pre-welding jig according to claim 7, characterized in that: The pre-welding jig further comprises a clamping structure, the clamping structure being located on a side of the battery cell shell (10) facing away from the support structure, the clamping structure being capable of moving in a direction toward and away from the battery cell shell (10), and the clamping structure being used to press the battery cell shell (10) onto the support structure.

10. The pre-welding jig according to claim 9, characterized in that: The clamping structure comprises a fifth driving member (710), an elastic member (720) and a clamping member (730); the fifth driving member (710) is a linear driving member; the driving direction of the fifth driving member (710) is the same as the deformation direction of the elastic member (720); the fifth driving member (710) is used to drive the clamping member (730) to move in a direction toward and away from the battery cell shell (10); The driving end of the fifth driving member (710) is connected to one end of the elastic member (720), and the side of the pressing member (730) facing away from the battery cell shell (10) is connected to the other end of the elastic member (720); And / or, the elastic member (720) is arranged on a side of the pressing member (730) facing the battery cell casing (10).

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