Tab welding device and battery cell production equipment

Abstract

The utility model discloses a tab welding device and battery cell production equipment. The tab welding device comprises a base; the welding mechanism is mounted on the base; the first driving part is used for driving the welding mechanism to move, so that the welding mechanism is located at the working position or the avoiding position; when the welding mechanism is located at the avoiding position, the first detection mechanism can detect the welding position of the pole piece. The welding position of the pole piece on the welding station can be detected, and the quality of a battery cell is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of battery production equipment, and specifically to a tab welding device and battery cell production equipment. Background Art

[0002] During the production of battery cells, one process is to weld the tabs to the pole pieces. The position accuracy of the tabs relative to the pole pieces is crucial to the quality of the battery cells. In the prior art, after the pole pieces are transported to the welding station, the welding position of the pole pieces cannot be detected due to the obstruction of the welding mechanism. Therefore, if the pole pieces are offset, it cannot be detected, and the subsequent tabs will be placed in the wrong welding position on the pole pieces, affecting the quality of the battery cells.

[0003] Therefore, it is necessary to improve the existing technology and provide a new tab welding device and battery cell production equipment. Utility Model Content

[0004] One purpose of the present application is to provide a new technical solution for a tab welding device and a battery cell production equipment.

[0005] To achieve the above-mentioned purpose, according to the first aspect of the present application, a pole piece welding device is provided, comprising: a base; a welding mechanism, which is installed on the base and can move relative to the base; a first driving member, which is used to drive the welding mechanism to move so that the welding mechanism is in a working position or an avoidance position; and a first detection mechanism, which can detect the welding position of the pole piece when the welding mechanism is in the avoidance position.

[0006] Optionally, when the first detection mechanism detects that the welding position of the electrode piece is offset, a first signal is sent out, and the adjustment mechanism adjusts the welding position of the electrode piece according to the first signal; or, the electrode tab conveying mechanism adjusts the position of the electrode tab according to the first signal.

[0007] Optionally, the pole piece welding device further comprises a movable seat and a welding platform, wherein the movable seat is mounted on the base and can move relative to the base, the first driving member is used to drive the movable seat to move, the movable seat is mounted with a second driving member, and the second driving member is connected to the welding mechanism; the welding platform is used to carry the pole piece, and the second driving member is used to drive the welding mechanism to approach or move away from the welding platform.

[0008] Optionally, the base is provided with an opening, and when the welding mechanism is in the avoidance position, the first detection mechanism can detect the welding position of the pole piece through the opening.

[0009] Optionally, the first detection mechanism is used to detect the edge of the pole piece, and the adjustment mechanism is used to adjust the welding position of the pole piece along the width direction of the pole piece.

[0010] Optionally, the first detection mechanism is used to detect the boundary line between the coated area and the empty foil area of ​​the pole piece, and the adjustment mechanism is used to adjust the welding position of the pole piece along the length direction of the pole piece.

[0011] Optionally, the adjustment mechanism includes a pole piece conveying mechanism, and the pole piece conveying mechanism adjusts the welding position of the pole piece along the length direction of the pole piece according to the first signal.

[0012] Optionally, the pole piece welding device further comprises a second detection mechanism, which is located upstream of the welding mechanism in the pole piece conveying direction, and is used to detect the detection edge of the pole piece. When the second detection mechanism detects the detection edge of the pole piece, it sends a second signal, and the pole piece conveying mechanism conveys the pole piece of a predetermined length to the downstream according to the second signal.

[0013] Optionally, the tab conveying mechanism includes a third driving member, and / or a fourth driving member, and / or a fifth driving member and a clamp; the third driving member is used to drive the clamp to move along a first direction, the fourth driving member is used to drive the clamp to move along a second direction, and the fifth driving member is used to drive the clamp to move along a third direction, and the first direction, the second direction and the third direction intersect each other.

[0014] According to a second aspect of the present application, a battery cell production device is provided, comprising: the tab welding device as described above.

[0015] The pole piece welding device in the embodiment of the present application adopts a first driving member to drive the welding mechanism to a working position or an avoidance position. When it is necessary to detect the welding position of the pole piece, the first driving member drives the welding mechanism to retreat to the avoidance position without blocking the first detection mechanism. At this time, the first detection mechanism can detect the welding position of the pole piece below the welding mechanism. Therefore, if the pole piece is displaced during the transportation process, it will be discovered in time by the first detection mechanism, ensuring the accuracy of the pole piece welding. The battery cell production equipment adopts the above-mentioned pole piece welding device, which can ensure that the battery cell has good quality.

[0016] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0018] Figure 1 This is a working principle diagram of a tab welding device according to an embodiment of the present application.

[0019] Figure 2 It is a schematic diagram of the relative positions of the pole ear and the pole piece of one embodiment of the present application.

[0020] Figure 3 It is a partially enlarged schematic diagram of the relative position of the pole ear and the pole piece of an embodiment of the present application, at which time the position of the pole piece is offset.

[0021] Figure 4 It is a three-dimensional diagram of a tab welding device according to an embodiment of the present application.

[0022] Figure 5 It is a three-dimensional view from another angle of a tab welding device according to an embodiment of the present application.

[0023] Figure 6 This is a working principle diagram of a tab welding device according to an embodiment of the present application, in which the welding mechanism is in a working position.

[0024] Figure 7 This is a working principle diagram of a tab welding device according to an embodiment of the present application, in which the welding mechanism is in an avoidance position.

[0025] Figure 8 It is a front view of a tab conveying mechanism according to an embodiment of the present application.

[0026] Fig. 9 It is a top view of a tab conveying mechanism according to an embodiment of the present application.

[0027] Description of reference numerals:

[0028] 1. Welding mechanism; 2. Welding platform; 3. Pole piece; 301. Detection edge; 302. Edge; 303. Coating area; 304. Empty foil area; 305. Boundary line; 4. Roller; 5. Pole ear; 6. Second detection mechanism; 7. Base; 701. Opening; 8. First drive member; 9. First detection mechanism; 10. Pole ear conveying mechanism; 1001. Third drive member; 1002. Fourth drive member; 1003. Fifth drive member; 1004. Clamp; 11. Moving seat; 12. Second drive member; 13. Mounting seat; 14. Drive plate. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0032] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0033] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0034] In the following description, each driving component can adopt a power source such as a cylinder, a first motor, etc., and adopt a transmission method such as piston transmission, gear rack transmission, etc.

[0035] In the following description, the pole piece 3 and the pole tab 5 are only used to describe the working principle of the pole tab welding device and the battery cell production equipment, and should not be regarded as a part of any mechanism, device or equipment.

[0036] In the following description, "connection" includes both a direct connection between the two and an indirect connection between the two via, for example, an adapter plate, a driving member, etc.

[0037] like Figure 1 and Figure 2 As shown, in Figure 1 In the figure, only the roller 4 of the electrode conveying mechanism is shown, and other parts of the electrode conveying mechanism are omitted. The electrode conveying mechanism conveys the electrode 3 toward the welding mechanism 1, and the electrode 3 is supported by the welding platform 2 below the welding mechanism 1. The welding mechanism 1 can be an ultrasonic welding mechanism, a laser welding mechanism, a pressure welding mechanism, or the like, which can weld the electrode tab 5 to the electrode 3. After the second detection mechanism 6 upstream of the welding mechanism 1 detects the detection edge 301 on the electrode 3, it sends a second signal to the electrode conveying mechanism. After receiving the second signal, the electrode conveying mechanism will continue to convey a predetermined length of the electrode 3 toward the downstream based on the detection edge 301, and then the electrode conveying mechanism will suspend the conveying, and the electrode tab 5 will be placed in the welding position of the electrode 3, and the welding mechanism 1 will weld the electrode tab 5 to the electrode 3. As shown in Figure 2As shown in more detail, under ideal conditions, the pole piece 3 does not shift. After the pole piece conveying mechanism stops conveying the pole piece 3, the distance between one side of the pole ear 5 and the detection edge 301 is exactly A, and the distance between a flange of the pole ear 5 and the edge 302 of the pole piece 3 is exactly B. At this time, the welding position of the pole piece 3 is correct, and the pole ear 5 can be aligned with the welding position on the pole piece 3.

[0038] like Figure 3 As shown in FIG. 1 , in actual production, the electrode 3 may be offset during transportation, which may cause incorrect welding positions. For example, in the width direction of the electrode 3, the edge 302 of the electrode 3 is offset from the position shown by the solid line to the position shown by the double-dotted line, resulting in the following: Figure 2 The value of B shown in becomes larger, or the actual length of the electrode 3 transported downstream by the electrode transport mechanism deviates greatly from the predetermined length, which may result in Figure 2 The value of A shown in becomes larger. The value of A or the value of B becomes larger or smaller, which will cause the relative position of the pole lug 5 and the pole piece 3 to change, the welding accuracy will become lower, and the quality of the battery cell will also be adversely affected. However, at this time, since the welding position of the pole piece 3 is below the welding mechanism 1, the offset of the welding position of the pole piece 3 cannot be detected due to the obstruction of the welding mechanism 1.

[0039] like Figures 4 to 9 As shown, the present application provides a pole piece welding device, comprising: a base 7; a welding mechanism 1, which is installed on the base 7 and can move relative to the base 7; a first driving member 8, which is used to drive the welding mechanism 1 to move so that the welding mechanism 1 is in a working position or an avoidance position; a first detection mechanism 9, which can detect the welding position of the pole piece 3 when the welding mechanism 1 is in the avoidance position.

[0040] In more detail, the base 7 can be a plate, or a structure formed by welding multiple plates, or a stamping part, a casting part, etc. The welding mechanism 1 can be installed on the base 7 through structures such as linear rails and slideways, so that the welding mechanism 1 can move relative to the base 7. The first driving member 8 can be installed on the base 7 or the surrounding fixed structure, and the first driving member 8 can drive the welding mechanism 1 to move, so that the welding mechanism 1 is in a state such as Figure 6 Working position as shown or in Figure 7 The first detection mechanism 9 can be a mechanism such as a CCD (Charge-Coupled Device) camera, a photoelectric sensor, etc. that can detect the welding position of the electrode 3. Figure 6 In the working position shown, the welding mechanism 1 welds the pole piece 3 and the pole ear 5. At this time, the first detection mechanism 9 does not need to perform detection, so it can be shielded by the welding mechanism 1. Figure 7In the avoidance position shown, the welding mechanism 1 avoids the first detection mechanism 9, and the first detection mechanism 9 can detect the welding position of the electrode 3 at the welding station. Therefore, if the electrode 3 is displaced during the transportation process, the position displacement will be discovered in time by the first detection mechanism 9 at the welding station. In addition, the first detection mechanism 9 can be set above the welding mechanism 1 (above the working position), and the space layout is compact.

[0041] In the embodiment of the present application, after solving the problem of how to detect the welding position of the electrode piece 3, it is also possible to further solve the problem of how to ensure the correct welding position of the electrode tab 5 and the electrode piece 3. When the first detection mechanism 9 detects that the welding position of the electrode piece 3 is offset, a first signal is sent, and the adjustment mechanism adjusts the welding position of the electrode piece 3 according to the first signal; or, the electrode tab conveying mechanism 10 adjusts the position of the electrode tab 5 according to the first signal.

[0042] In more detail, the first detection mechanism 9 is electrically connected to the first driving member 8, that is, the first detection mechanism 9 can be electrically connected to the first driving member 8 directly or indirectly through a single chip microcomputer, a central processing unit, etc., so the first detection mechanism 9 can send an electrical signal to the first driving member 8. Figure 7 As shown, when the welding mechanism 1 is in the avoidance position, the first detection mechanism 9 can detect the welding position of the electrode 3. When the first detection mechanism 9 detects that the welding position of the electrode 3 is correct, it will send a third signal, such as a high-level signal or a third coded signal, etc. The first driving member 8 will drive the welding mechanism 1 to the position as shown in FIG. 1 according to the third signal sent by the first detection mechanism 9. Figure 6 The electrode piece 3 and the electrode lug 5 are welded in the working position shown in the figure. At this time, the relative position of the electrode piece 3 and the electrode lug 5 is correct. The first detection mechanism 9 is electrically connected to the adjustment mechanism (not shown in the figure). The adjustment mechanism can be a electrode piece correction mechanism, or the electrode piece conveying mechanism can be directly used as the adjustment mechanism. When the first detection mechanism 9 detects that the welding position of the electrode piece 3 is incorrect, for example, by detecting Figure 3 When the edge 302 of the pole piece 3 shown in the figure identifies that the position of the pole piece 3 is offset and causes the B value to increase, the first detection mechanism 9 will send a first signal, such as a low-level signal or a first coded signal different from the third coded signal, and the adjustment mechanism adjusts the welding position of the pole piece 3 according to the first signal sent by the first detection mechanism 9, so as to Figure 3 The edge 302 of the electrode piece 3 shown is adjusted from the double-dotted line position back to the solid line position, so that the electrode piece 3 is restored to the correct position relative to the electrode lug 5. Alternatively, the first detection mechanism 9 is electrically connected to the electrode lug conveying mechanism 10. When the first detection mechanism 9 detects that the welding position of the electrode piece 3 is incorrect, for example, by detecting Figure 3When the edge 302 of the pole piece 3 shown identifies that the position of the pole piece 3 is offset, causing the B value to increase, the first detection mechanism 9 will send a first signal, such as a low-level signal or a first coded signal different from the third coded signal, and the pole lug conveying mechanism 10 adjusts the position of the pole lug 5 according to the first signal. At this time, the pole piece 3 is no longer adjusted, but the pole lug 5 is adjusted to compensate for the position offset of the pole piece 3. At this time, the relative position of the pole lug 5 and the pole piece 3 can also be ensured to be correct. Then, the first driving member 8 drives the welding mechanism 1 to enter the working position to weld the pole lug 5 and the pole piece 3 together.

[0043] As can be seen from the above description, by using the pole tab welding device of the present application, even if the pole piece 3 is shifted during the transportation process, resulting in an incorrect position of the pole piece 3, the pole tab welding device can still ensure the correct relative position between the pole tab 5 and the pole piece 3 by identifying the position of the pole piece 3 and adjusting the position of the pole piece 3 or the pole tab 5, thereby ensuring the welding accuracy of the pole tab 5. The battery cell production equipment can ensure that the battery cell has good quality by using the above-mentioned pole tab welding device.

[0044] The technology of using photoelectric sensors, CCD cameras, etc. to detect the position of the pole piece and send out signals is known and will not be described in detail herein. Similarly, the specific structure of the pole piece conveying mechanism and adjustment mechanism (such as various pole piece correction mechanisms) is also known and will not be described in detail herein.

[0045] like Figure 4 and Figure 5 As shown, the tab welding device further includes a moving seat 11 and a welding platform 2. The moving seat 11 is mounted on the base 7 and can move relative to the base 7. The first driving member 8 is used to drive the moving seat 11 to move. The moving seat 11 is mounted with a second driving member 12, and the second driving member 12 is connected to the welding mechanism 1. The welding platform 2 is used to carry the pole piece 3, and the second driving member 12 is used to drive the welding mechanism 1 to approach or move away from the welding platform 2.

[0046] Specifically, in the present embodiment, the welding mechanism 1 is indirectly mounted on the base 7, but the present application does not exclude the solution that the welding mechanism 1 is directly mounted on the base 7. The moving seat 11 can also be a stamping, a casting, a separate plate, a welded part of multiple plates, etc. The moving seat 11 is mounted on the base 7 through structures such as linear rails and slideways, so it can move relative to the base 7. Taking the first drive member 8 as an example of a motor, the output shaft of the first drive member 8 is connected to the lead screw, the lead screw and the nut thread cooperate, the nut is fixedly connected to the drive plate 14, and the drive plate 14 is fixedly connected to the moving seat 11, so when the output shaft of the first drive member 8 rotates, it can drive the drive plate 14 to move through the lead screw nut structure, and the drive plate 14 drives the moving seat 11 to move, or the first drive member 8 can also use a cylinder, the piston rod of the cylinder is connected to the moving seat 11, so as to drive the moving seat 11 to move. The moving seat 11 is equipped with a second drive member 12, and the second drive member 12 is connected to the welding mechanism 1. The welding platform 2 is used to carry the pole piece 3. It can be considered that the welding position of the pole piece 3 is an area located on the welding platform 2. When the pole tab 5 needs to be welded to the pole piece 3, the second driving member 12 can drive the welding mechanism 1 to approach the welding platform 2, so that the welding mechanism 1 abuts against the pole tab 5; when the welding is completed, the second driving member 12 can drive the welding mechanism 1 away from the welding platform 2, and the pole piece conveying mechanism continues to convey the pole piece 3 downstream until the next welding position of the pole piece 3 reaches the top of the welding platform 2, and the pole tab 5 is placed on the pole piece 3. This structure is conducive to providing space for the pole tab 5 to be placed on the pole piece 3 when the welding mechanism 1 needs to contact the pole tab 5 for welding.

[0047] like Figure 4 and Figure 5 As shown, the base 7 is provided with an opening 701 . When the welding mechanism 1 is in the avoidance position, the first detection mechanism 9 can detect the welding position of the pole piece 3 through the opening 701 .

[0048] In more detail, the opening 701 can be a square hole, a round hole, or a concave structure. This structure enables the first detection mechanism 9 to be arranged in the Z direction directly above the welding mechanism 1 in the working position, so that the detection of the welding position of the pole piece 3 directly below the welding mechanism 1 is more accurate. When the welding mechanism 1 is in the working position, it will partially or completely block the opening 701, and the first detection mechanism 9 cannot detect the welding position of the pole piece 3 through the opening 701. When the welding mechanism 1 is in the avoidance position, the first detection mechanism 9 can detect the welding position of the pole piece 3 through the opening 701.

[0049] like Figure 3 As shown, in one embodiment, the first detection mechanism 9 is used to detect the edge 302 of the pole piece 3 , and the adjustment mechanism is used to adjust the welding position of the pole piece 3 along the width direction of the pole piece 3 .

[0050] In more detail, taking the CCD camera as an example, the CCD camera can identify the edge 302 of the pole piece 3. When the edge 302 of the pole piece 3 changes compared to the reference position, for example, when it shifts to the position indicated by the double dotted line, the shift of the edge 302 will be detected by the CCD camera. At this time, the pole piece 3 is adjusted along the width direction through an adjustment mechanism (such as a common pole piece correction mechanism) to make the edge 302 of the pole piece 3 return to the position indicated by the solid line, thereby completing the adjustment of the welding position of the pole piece 3 and ensuring that the relative position of the pole ear 5 and the pole piece 3 in the width direction is correct.

[0051] like Figure 3 As shown, in another embodiment, the first detection mechanism 9 is used to detect the boundary line 305 between the coated area 303 and the empty foil area 304 of the pole piece 3, and the adjustment mechanism is used to adjust the welding position of the pole piece 3 along the length direction of the pole piece 3.

[0052] In more detail, the coated area 303 of the pole piece refers to the portion of the pole piece 3 coated with active material, the empty foil area 304 of the pole piece 3 refers to the portion not coated with active material, and the pole lug 5 needs to be welded at a specific position of the empty foil area 304. In this embodiment, the coated area 303 and the empty foil area 304 are alternately arranged in the length direction of the pole piece 3, so there will be a boundary line 305 between the two, and this boundary line 305 can be detected by the first detection mechanism 9, so as to identify whether the pole piece 3 is in the correct welding position based on the boundary line 305, and identify whether the pole piece 3 has shifted in the length direction, for example, the pole piece 3 actually transported by the pole piece conveying mechanism to the welding mechanism 1 based on the detection edge 301 is too long or too short. If the electrode piece 3 actually conveyed by the electrode piece conveying mechanism to the welding mechanism 1 based on the detection edge 301 is too long or too short, the boundary line 305 will also be offset, and the offset of the boundary line 305 will be detected by the first detection mechanism 9. At this time, the adjustment mechanism adjusts the welding position of the electrode piece 3 along the length direction of the electrode piece 3. For example, the electrode piece conveying mechanism is used as an adjustment mechanism to pull back a section of the electrode piece 3 upstream, or continue to convey a section of the electrode piece 3 downstream, so that the welding position of the electrode piece 3 in the length direction can be adjusted. The adjustment mechanism can also use a separate mechanism that can pull the electrode piece 3 in the length direction.

[0053] In other embodiments of the present application, the coated area 303 may be a continuous area located in the middle of the pole piece 3, and the empty foil area 304 may be an area close to the edge 302 of the pole piece 3. In this case, the boundary line 305 is a straight line roughly parallel to the edge 302. Therefore, the boundary line 305 can also be used as a reference for identifying whether the pole piece 3 is sound-deflected in the width direction, playing a role similar to the edge 302.

[0054] In the embodiment of the present application, when the adjustment mechanism adopts the electrode conveying mechanism, the first detection mechanism 9 needs to be electrically connected to the electrode conveying mechanism, so as to send the third signal or the first signal to the electrode conveying mechanism, and the electrode conveying mechanism adjusts the welding position of the electrode 3 along the length direction of the electrode 3 according to the first signal, for example, pulling back a section of the electrode 3 upstream, or continuing to convey a section of the electrode 3 downstream. In this way, there is no need to add an additional electrode pulling mechanism.

[0055] like Figure 1 As shown, the pole piece welding device also includes a second detection mechanism 6. In the pole piece conveying direction, the second detection mechanism 6 is located upstream of the welding mechanism 1. The second detection mechanism 6 is used to detect the detection edge 301 of the pole piece 3. When the detection edge 301 of the pole piece 3 is detected, a second signal is sent. The pole piece conveying mechanism conveys the pole piece 3 of a predetermined length to the downstream according to the second signal sent by the second detection mechanism 6.

[0056] In more detail, the second detection mechanism 6 can use an image recognition mechanism, a photoelectric sensor, etc. to identify the detection edge 301. The second signal can be a high level signal, a low level signal, or a signal different from the first coded signal and the third coded signal.

[0057] The working process of the entire pole piece welding device is as follows: the pole piece conveying mechanism conveys the pole piece 3 toward the welding mechanism 1, and the pole piece 3 will be supported by the welding platform 2 below the welding mechanism 1. In the conveying direction of the pole piece 3, the second detection mechanism 6 upstream of the welding mechanism 1 will send a second signal to the pole piece conveying mechanism after detecting the detection edge 301 on the pole piece 3. After receiving the second signal, the pole piece conveying mechanism will continue to convey the pole piece 3 of a predetermined length downstream based on the detection edge 301. Then the pole piece conveying mechanism suspends conveying. The welding mechanism 1 is in the avoidance position, and the first detection mechanism 9 detects the welding position of the pole piece 3 (i.e., an area on the welding platform 2). If the first detection mechanism 9 sends a third signal, the first driving member 8 drives the welding mechanism 1 into the working position to weld the pole piece 5 to the pole piece 3. If the first detection mechanism 9 sends a first signal, the adjustment mechanism adjusts the position of the pole piece 3 in the length or width direction, so that the welding position of the pole piece 3 reaches the predetermined correct position, or, instead of adjusting the position of the pole piece 3, the pole piece conveying mechanism 10 adjusts the position of the pole piece 5 to compensate for the position deviation of the pole piece 3, so as to finally achieve the correct relative position of the pole piece 5 and the pole piece 3 and ensure the welding accuracy. After the welding is completed, the first driving mechanism 8 drives the welding mechanism 1 to retreat to the avoidance position, the pole piece conveying mechanism continues to convey the pole piece 3 downstream, and the first detection mechanism 9 detects the welding position of the pole piece 3.

[0058] like Figure 8 and Fig. 9As shown, the tab conveying mechanism 10 in one embodiment of the present application includes a third driving member 1001 and a clamp 1004. The third driving member 1001 is used to drive the clamp 1004 to move along the X direction, and the clamp 1004 is used to clamp the tab 5 so as to place the tab 5 on the pole piece 3. Due to the presence of the third driving member 1001, the clamp 1004 can adjust the position of the tab 5 along the width direction of the pole piece 3, thereby compensating for the offset of the pole piece 3 in the width direction. Optionally, the tab conveying mechanism 10 includes a fourth driving member 1002 and a clamp 1004, and the fourth driving member 1002 is used to drive the clamp 1004 to move along the Y direction, so that the clamp 1004 can adjust the position of the tab 5 along the length direction of the pole piece 3, and compensate for the offset of the pole piece 3 in the length direction. Optionally, the tab conveying mechanism 10 includes a fifth driving member 1003 and a clamp 1004, and the fifth driving member 1003 is used to drive the clamp 1004 to move along the Z direction, thereby adapting to different heights of the welding position. In such Figure 8 and Fig. 9 In the embodiment shown, the third driving member 1001, the fourth driving member 1002, the fifth driving member 1003 and the clamp 1004 exist at the same time, so the clamp 1004 has three degrees of freedom. The X direction, the Y direction and the Z direction intersect each other. In this article, the X direction refers to the first direction, the Y direction refers to the second direction, and the Z direction refers to the third direction. The three directions are different directions and can refer to the width direction, the length direction, and the up and down direction of the pole piece welding device, respectively.

[0059] In more detail, the clamping jaws 1004 can be cylinder clamping jaws, and the clamping and loosening of the pole lug 5 can be realized by the action of the cylinder. The third driving member 1001, the fourth driving member 1002, the fifth driving member 1003 and the clamping jaws 1004 can be directly connected or indirectly connected through structures such as adapter plates. The existence of the third driving member 1001, the fourth driving member 1002, and the fifth driving member 1003 alone enables the clamp 1004 to have the freedom to translate in one of the X direction, the Y direction, and the Z direction. When there are two driving members, the clamp 1004 can have the freedom to translate in two directions. The existence of the third driving member 1001, the fourth driving member 1002, and the fifth driving member 1003 at the same time enables the clamp 1004 to have the freedom to translate in three directions, namely, the X direction, the Y direction, and the Z direction. Therefore, no matter whether the pole piece 3 is offset in the length direction or the width direction, the clamp 1004 can place the pole ear 5 in the correct welding position, and retreat after welding is completed to facilitate the clamping of the next pole ear 5 and allow the pole piece 3 to continue to be transported, or enable the clamp 1004 to adapt to the height of different welding positions. In this embodiment, the mobile end of the third driving member 1001 is connected to the fourth driving member 1002, the mobile end of the fourth driving member 1002 is connected to the fifth driving member 1003, and the mobile end of the fifth driving member 1003 is connected to the clamp 1004, so that the clamp 1004 has translational freedom in three directions: X direction, Y direction and Z direction.

[0060] In other embodiments of the present application, a robot with multiple degrees of freedom can also be used as the tab conveying mechanism 10 .

[0061] In one embodiment of the present application, the first detection mechanism 9 uses a CCD camera to adapt to a wider range of position detection purposes of the pole piece 3.

[0062] According to the second aspect of the present application, a battery cell production device is also provided. The battery cell production device adopts the aforementioned pole tab welding device, so that the welding accuracy of the pole tab 5 is improved and the quality of the produced battery cells can be guaranteed.

[0063] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0064] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A tab welding device, characterized in that: include: Base (7); A welding mechanism (1), the welding mechanism (1) being mounted on the base (7) and being movable relative to the base (7); A first driving member (8), the first driving member (8) being used to drive the welding mechanism (1) to move so that the welding mechanism (1) is in a working position or an avoidance position; A first detection mechanism (9), when the welding mechanism (1) is in the avoidance position, the first detection mechanism (9) can detect the welding position of the pole piece (3).

2. The tab welding device according to claim 1, characterized in that: When the first detection mechanism (9) detects that the welding position of the electrode piece (3) is offset, a first signal is sent out, and the adjustment mechanism adjusts the welding position of the electrode piece (3) according to the first signal; or, the electrode tab conveying mechanism (10) adjusts the position of the electrode tab (5) according to the first signal.

3. The tab welding device according to claim 1, characterized in that: The invention also comprises a movable seat (11) and a welding platform (2); the movable seat (11) is mounted on the base (7) and is movable relative to the base (7); the first driving member (8) is used to drive the movable seat (11) to move; the movable seat (11) is mounted with a second driving member (12); the second driving member (12) is connected to the welding mechanism (1); the welding platform (2) is used to carry the pole piece (3); the second driving member (12) is used to drive the welding mechanism (1) to approach or move away from the welding platform (2).

4. The tab welding device according to claim 1, characterized in that: The base (7) is provided with an opening (701), and when the welding mechanism (1) is in the avoidance position, the first detection mechanism (9) can detect the welding position of the pole piece (3) through the opening (701).

5. The tab welding device according to claim 2, characterized in that: The first detection mechanism (9) is used to detect the edge (302) of the pole piece, and the adjustment mechanism is used to adjust the welding position of the pole piece (3) along the width direction of the pole piece (3).

6. The tab welding device according to claim 2, characterized in that: The first detection mechanism (9) is used to detect the boundary line (305) between the coated area (303) and the empty foil area (304) of the pole piece, and the adjustment mechanism is used to adjust the welding position of the pole piece (3) along the length direction of the pole piece (3).

7. The tab welding device according to claim 6, characterized in that: The adjustment mechanism comprises a pole piece conveying mechanism, and the pole piece conveying mechanism adjusts the welding position of the pole piece (3) along the length direction of the pole piece (3) according to the first signal.

8. The tab welding device according to claim 1, characterized in that: The invention also comprises a second detection mechanism (6), wherein the second detection mechanism (6) is located upstream of the welding mechanism (1) in the direction of pole piece conveying, and the second detection mechanism (6) is used to detect the detection edge (301) of the pole piece (3). When the second detection mechanism (6) detects the detection edge (301) of the pole piece (3), a second signal is sent, and the pole piece conveying mechanism conveys the pole piece (3) of a predetermined length to the downstream according to the second signal.

9. The tab welding device according to claim 1, characterized in that: The tab conveying mechanism (10) comprises a third driving member (1001), and / or a fourth driving member (1002), and / or a fifth driving member (1003) and a clamp (1004); the third driving member (1001) is used to drive the clamp (1004) to move along a first direction, the fourth driving member (1002) is used to drive the clamp (1004) to move along a second direction, and the fifth driving member (1003) is used to drive the clamp (1004) to move along a third direction, and the first direction, the second direction and the third direction intersect each other.

10. A battery cell production device, characterized in that: It comprises the tab welding device as claimed in any one of claims 1 to 9.

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