Battery cell welding jig with adjustable welding position and battery cell welding device

Abstract

The application discloses a welding position-adjustable battery cell welding jig and a battery cell welding device. The welding position-adjustable battery cell welding jig comprises a first guide piece tab adjusting piece. The first guide piece is used for abutting against a to-be-welded part of a tab. The first guide piece is provided with a welding channel. An opening of a first end of the welding channel is arranged in alignment with the to-be-welded part. The welding channel is used for allowing laser to pass through. The tab adjusting piece is movably arranged along a stacking direction of a battery cell. The tab adjusting piece changes the length of the to-be-welded part by adjusting the depth of insertion into a tab wrinkle.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a cell welding fixture and cell welding apparatus with adjustable welding position. Background Technology

[0002] In the battery manufacturing process, battery cells need to be packaged into a casing to form a battery. The processing quality of the cell packaging process directly affects the battery's sealing performance, shock resistance, and thermal management performance. Typically, laser welding is used to ensure the casing is sealed to prevent electrolyte leakage. For dual-tab cells, each cell has protruding tabs on both sides. During packaging, one tab is first welded to the casing cover. Then, the cell is flipped over for packaging, and a second welding is performed to secure the other tab to the casing. The second welding process requires high precision; for example, the welding laser must accurately target the cell's tabs, and the tabs must not move during the welding process. Currently, there is a lack of effective control methods for the tabs during the welding process. Utility Model Content

[0003] To solve at least one of the above-mentioned technical problems, this application provides a battery cell welding fixture and a battery cell welding device with adjustable welding position, which can improve the accuracy and reliability of the electrode welding process. The technical solution adopted is as follows.

[0004] The first aspect of this application provides an adjustable welding position battery cell welding fixture, comprising a first guide and a tab adjustment member. The first guide is used to abut against the part to be welded on the tab. The first guide is provided with a welding channel, the opening of the first end of the welding channel is aligned with the part to be welded, and the welding channel allows a laser to pass through. The tab adjustment member is movably disposed along the stacking direction of the battery cell, and the length of the part to be welded is changed by adjusting the depth of insertion into the tab fold.

[0005] In some embodiments of this application, the cell fixture further includes a second guide, the second guide having a guide portion that is plugged into the welding channel, and the second guide being movable relative to the first guide to allow the guide portion to exit the welding channel.

[0006] In some embodiments of this application, the welding channel has a first end and a second end disposed opposite to each other, a laser passes through the welding channel from the second end to the first end, and the guide portion is movable along the axial direction of the welding channel, the guide portion being able to enter or exit the welding channel from the opening at the second end.

[0007] In some embodiments of this application, the sidewall of the welding channel is provided with an opening groove, and the guide portion is movable radially along the welding channel, and the guide portion can enter or exit the welding channel from the opening groove.

[0008] In some embodiments of this application, the cell welding fixture further includes a positioning mechanism disposed at the first end of the welding channel, the positioning mechanism being used to clamp the cell.

[0009] In some embodiments of this application, the positioning mechanism includes a driving structure and at least a first pressing block and a second pressing block. The first pressing block clamps the battery cell along a first direction, and the second pressing block clamps the battery cell along a second direction. The first direction and the second direction are perpendicular to each other. The driving mechanism simultaneously drives the first pressing block and the second pressing block to move.

[0010] In some embodiments of this application, the positioning mechanism further includes a first transmission link and a first reset member. One end of the first transmission link is connected to the first pressure block. The driving mechanism is provided with a first driving inclined surface. The other end of the first transmission link is slidably connected to the first driving inclined surface. The first driving inclined surface is used to drive the first transmission link to move in a first direction when the driving mechanism moves in a second direction. The first pressure block moves in the first direction and moves away from the surface of the battery cell. The first reset member is connected to the first transmission link. The first reset member is used to apply an elastic force to the first transmission link and keep the first pressure block abutting against the surface of the battery cell.

[0011] In some embodiments of this application, the positioning mechanism further includes a second transmission link, a third transmission link, an inclined guide, and a second reset member. The driving mechanism is provided with a second driving inclined surface, and the second driving inclined surface and the first driving inclined surface are distributed along the circumference of the driving mechanism.

[0012] The second transmission link is slidably connected to the second driving inclined surface. The third transmission link connects the second transmission link and the second pressure block. The inclined surface guide is connected to the third transmission link. The second driving inclined surface is used to drive the second transmission link to move in the first direction when the driving mechanism moves in the second direction. The inclined surface guide is used to guide the third transmission link to move in the second direction. The second pressure block moves in the second direction and away from the cell surface. The second reset member is connected to the second transmission link. The second reset member is used to apply an elastic force to the second transmission link and keep the second pressure block abutting against the cell surface.

[0013] In some embodiments of this application, the positioning mechanism further includes a third pressure block, which is spaced apart from the first pressure block and the second pressure block. The battery cell includes a first electrode and a second electrode disposed at both ends of the battery cell. The first guide is used to abut against the first electrode, and the third pressure block is used to clamp the second electrode along a second direction.

[0014] In some embodiments of this application, the positioning mechanism includes a substrate and a cell holder, the cell holder is disposed on the substrate and is used to accommodate the cell, the first pressure block and the second pressure block are disposed around the cell holder, and when the driving mechanism drives the first pressure block and the second pressure block to move, the first pressure block and the second pressure block move away from the cell holder.

[0015] Secondly, this application also provides a battery cell welding apparatus, including a laser component and the battery cell welding fixture provided in the first aspect, wherein the laser component is used to generate a laser and allow the laser to pass through the welding channel, and the laser is used to weld the tabs of the battery cell.

[0016] The embodiments of this application have at least the following beneficial effects: By controlling the different depths to which the tab adjusting member is inserted into the tab folds, the depth of the formed folds can be adjusted, thereby achieving adjustment of the length of the free end of the tab, further improving the control precision and reliability during tab welding. Using the first guide member to hold the tab in place prevents problems such as tab displacement or warping during the tab welding process, improving the stability and accuracy of the tab welding process. By setting a welding channel in the first guide member, the part of the tab to be welded can be exposed; the exposed part of the tab is the area that the welding laser can reach, thereby further limiting the range of laser welding and improving welding precision. During the adjustment of the fold depth by the tab adjusting member, using the first guide member to keep it abutting against the surface of the free end of the tab can prevent the free end of the tab from warping, further improving the accuracy and reliability of the tab during welding. Attached Figure Description

[0017] The present application will be further illustrated below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments illustrated in the following drawings are exemplary and are only used to explain the present application, and should not be construed as limiting the present application.

[0018] Figure 1 This is a schematic diagram of the electrode tab structure during battery cell welding;

[0019] Figure 2 This is a schematic diagram of the structure of the battery cell welding fixture provided in the embodiments of this application;

[0020] Figure 3 A schematic diagram showing the connection between the first guide and the second guide of the battery cell welding fixture provided in an embodiment of this application;

[0021] Figure 4 A first example diagram showing the separation of the first guide and the second guide of the battery cell welding fixture provided in this application embodiment;

[0022] Figure 5 A second example diagram showing the separation of the first guide and the second guide of the cell welding fixture provided in this application embodiment;

[0023] Figure 6 A schematic diagram of the positioning mechanism of the battery cell welding fixture provided in the embodiments of this application;

[0024] Figure 7 This is a top view of the positioning mechanism of the battery cell welding fixture provided in an embodiment of this application.

[0025] Figure label:

[0026] 1000. Battery cell welding fixture;

[0027] 100. First guide element; 110. Welding channel; 111. First end; 112. Second end; 113. Opening slot;

[0028] 200. Second guide component; 210. Guide section;

[0029] 300. Adjustable tab;

[0030] 400. Positioning mechanism;

[0031] 410. First pressing block; 420. Second pressing block;

[0032] 430. Drive mechanism; 431. First drive inclined plane; 432. Second drive inclined plane;

[0033] 441. First transmission link; 442. Second transmission link; 443. Third transmission link; 444. Inclined guide;

[0034] 451. First reset component; 452. Second reset component; 453. Third reset component;

[0035] 460. Third pressing block;

[0036] 471. Substrate; 472. Battery cell holder;

[0037] 2000, Battery cell; 2100, Tab; 2110, Wrinkle; 2120, Part to be soldered; 2200, Housing. Detailed Implementation

[0038] The embodiments of this application are described in detail below with reference to the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0039] In the description of this application, it should be understood that the terms "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0040] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0041] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] In the description of this application, the use of terms such as "as one implementation," "an embodiment," "some examples," "some embodiments," "illustrative embodiment," "example," "specific example," "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] In the battery manufacturing process, battery cells need to be packaged into a casing to form a battery. The processing quality of the cell packaging process directly affects the battery's sealing performance, shock resistance, and thermal management performance. Typically, laser welding is used to ensure the casing is sealed to prevent electrolyte leakage. For dual-tab cells, which have protruding tabs on both sides, the packaging process involves first welding one tab to the casing cover. Then, the cell is flipped over for packaging, and a second welding is performed to secure the other tab to the casing. The second welding process requires high precision; for example, the welding laser must accurately target the cell tab and ensure that the tab does not move during the welding process.

[0044] Based on this, the first aspect of this application provides a battery cell welding apparatus, which includes a laser component and a battery cell welding fixture 1000 (hereinafter referred to as the battery cell welding fixture 1000) with adjustable welding position. The battery cell welding fixture 1000 is used to fix the battery cell 2000 and the electrode 2100. The laser component is used to generate a laser and make the laser pass through the welding channel 110 in the battery cell welding fixture 1000. The laser is used to weld the electrode 2100 of the battery cell 2000. Using the battery cell welding apparatus of this application, the welding accuracy of the laser at the electrode 2100 can be improved, and the stability of the electrode 2100 during the welding process can be improved, thereby improving the welding quality.

[0045] Other components and operations of the battery cell welding apparatus and laser components are already described in the relevant art to those skilled in the art, and will not be described in detail here. The structure of the battery cell welding fixture 1000 will be described below.

[0046] Please see Figure 1 The battery cell 2000 typically has multiple tabs 2100, which protrude from the side of the battery cell 2000. During laser welding, the multiple tabs 2100 are welded and fixed to the housing 2200. One end of the tab 2100 is fixed in the electrode sheet of the battery cell 2000, and the other end is a free end. The free end of the tab 2100 is used for welding and fixing to the housing 2200. Therefore, the free end of the tab 2100 is the welding part 2120 of the tab 2100. To ensure the accuracy and quality of the welding of the battery cell 2000, the length of the free end of the tab needs to be controlled.

[0047] Please combine Figures 1 to 3The second aspect of this application provides a battery cell welding fixture 1000, including a first guide 100 and a tab adjusting member 300. The first guide 100 is used to abut against the welding portion 2120 of the tab 2100. The first guide 100 is provided with a welding channel 110, the opening of the first end 111 of the welding channel 110 is aligned with the welding portion 2120, and the welding channel 110 allows a laser to pass through. The tab adjusting member 300 is movably disposed along the stacking direction of the battery cell 2000, and the length of the welding portion 2120 is changed by adjusting the depth of insertion into the tab fold 2110. The tab adjuster 300 can be inserted into the tab fold 2110. The tab 2100 is bent to form a portion of the fold 2110 and a free end. The greater the depth of the fold 2110, the shorter the length of the exposed free end of the tab 2100; the shallower the fold 2110, the longer the exposed free end of the tab 2100. Therefore, it can be seen that the length of the free end can be changed by adjusting the depth of the fold 2110. Utilizing this principle, by controlling the different depths to which the tab adjuster 300 is inserted into the tab fold 2110, the depth of the formed fold 2110 is adjusted, thereby achieving adjustment of the length of the free end of the tab (i.e., the length of the welding portion 2120 of the tab 2100), further improving the control precision and reliability during the welding of the tab 2100. The first guide 100 presses down the tab 2100, preventing problems such as tab 2100 shifting or warping during the welding process, improving the stability and accuracy of the tab welding process. By providing a welding channel 110 in the first guide 100, the welding portion 2120 of the electrode 2100 can be exposed. The exposed portion of the electrode 2100 is the area that the welding laser can reach, thereby further limiting the range of laser welding and improving welding accuracy. During the adjustment of the depth of the wrinkle 2110 by the electrode adjustment member 300, the first guide 100 can also maintain contact with the surface of the free end of the electrode 2100, preventing the free end of the electrode 2100 from lifting up, further improving the accuracy and reliability of the electrode 2100 during welding.

[0048] Optionally, the direction of the depth of the fold 2110 is the same as the direction of the stacking of the cell 2000 tab 2100, such as... Figure 1 As shown, multiple tabs 2100 are stacked along the z-direction in the figure, and folds 2110 extend along the z-direction. Therefore, adjusting the depth of the folds 2110 can achieve the length adjustment of the free ends of the multiple tabs 2100.

[0049] For example, the tab adjusting member 300 can be in the form of a rod or a plate, specifically designed to extend into the tab fold 2110. By moving the tab adjusting member 300 through a power structure (such as a motor or cylinder), the depth of the tab fold 2110 can be adjusted by the tab adjusting member 300.

[0050] Because the welding channel 110 in the first guide 100 has a hollow structure, the electrode 2100 may warp when the first guide 100 abuts against the surface of the electrode 2100. To solve this problem, in some embodiments, the cell welding fixture 100 is further provided with a second guide 200. The second guide 200 has a guide portion 210, which is inserted into the welding channel 110. The second guide 200 is movable relative to the first guide 100 so that the guide portion 210 can be withdrawn from the welding channel 110. When the guide portion 210 of the second guide 200 is inserted into the welding channel 110 of the first guide 100, the guide portion 210 can be used to flatten the electrode 2100, preventing the portion of the electrode 2100 pressed into the welding channel 110 from warping, thereby further improving the welding effect of the electrode 2100. On the other hand, the first guide 100 and the second guide 200 can simultaneously approach the battery cell 2000 and abut against the surface of the tab 2100. The cooperative action of the first guide 100 and the second guide 200 improves the stability of the first guide 100 and the second guide 200 when they approach the battery cell 2000, and also improves the accuracy of the second guide 200 abutting against the surface of the tab 2100. The welding channel 110 can be aligned with the welding portion 2120 of the tab 2100. After the guide portion 210 retracts from the welding channel 110, the welding portion of the tab 2100 is exposed, facilitating laser entry into the welding channel 110 to weld the tab 2100.

[0051] In some embodiments, please combine Figure 3 and Figure 4 The welding channel 110 has a first end 111 and a second end 112 disposed opposite to each other. The laser passes through the welding channel 110 from the second end 112 to the first end 111. The guide portion 210 is movable along the axial direction of the welding channel 110 and can enter or exit the welding channel 110 from the opening of the second end 112. In this way, the entry or exit direction of the guide portion 210 is the same as the axial direction of the welding channel 110, which simplifies the structural arrangement of the welding channel 110 and simplifies the movement of the guide portion 210.

[0052] In some embodiments, please combine Figure 3 and Figure 5 The welding channel 110 has an opening groove 113 on its side wall. The guide part 210 is movable radially along the welding channel 110 and can enter or exit the welding channel 110 through the opening groove 113. By using the opening groove 113, the welding channel 110 forms an open channel, which allows the guide part 210 to enter or exit radially along the welding channel 110, reducing the difficulty of aligning the guide part 210 with the laser channel.

[0053] In some embodiments, please refer to Figure 6 and Figure 7 The battery cell welding fixture 1000 also includes a positioning mechanism 400, which is disposed at the first end 111 of the welding channel 110 and is used to clamp the battery cell 2000. By using the positioning mechanism 400 to clamp and fix the battery cell 2000, the battery cell 2000 can maintain good stability during the welding process. Furthermore, by utilizing the cooperation between the positioning mechanism 400 and the first guide 100, the second guide 200, and the tab adjusting member 300, the alignment accuracy between the welding channel 110 and the battery cell 2000, as well as between the tab adjusting member 300 and the battery cell 2000, can be improved. The positioning mechanism 400 will be further described below.

[0054] In some embodiments, the positioning mechanism 400 includes a driving structure and at least a first pressing block 410 and a second pressing block 420. The first pressing block 410 clamps the battery cell 2000 along a first direction, and the second pressing block 420 clamps the battery cell 2000 along a second direction. The first and second directions are perpendicular to each other. The driving mechanism 430 simultaneously drives the first pressing block 410 and the second pressing block 420 to move. By setting the first pressing block 410 and the second pressing block 420, the battery cell 2000 can be clamped in at least two directions, improving the stability of the battery cell 2000 during the welding process. The driving mechanism 430 can simultaneously drive the first pressing block 410 and the second pressing block 420, which helps to simplify the transmission structure of the first pressing block 410 and the second pressing block 420, reduce the number of power sources, and thus simplify the structure of the positioning mechanism 400.

[0055] For example, the first direction can be the horizontal direction, such as... Figure 6 The x-direction shown can be followed by a second direction, such as the vertical direction. Figure 6 The z-direction is shown. The first pressing block 410 can abut against the side of the battery cell 2000, and the second pressing block 420 can abut against the upper surface of the battery cell 2000. Of course, in other examples, the first direction and the second direction may not be limited to the horizontal or vertical directions. The following explanation will continue with the example of the first direction being horizontal and the second direction being vertical.

[0056] In some embodiments, the positioning mechanism 400 further includes a first transmission link 441 and a first reset member 451. One end of the first transmission link 441 is connected to the first pressure block 410. The driving mechanism 430 is provided with a first driving ramp 431. The other end of the first transmission link 441 is slidably connected to the first driving ramp 431. The first driving ramp 431 is used to drive the first transmission link 441 to move along the first direction when the driving mechanism 430 moves along the second direction. The first pressure block 410 moves along the first direction and moves away from the surface of the battery cell 2000. The first reset member 451 is connected to the first transmission link 441. The first reset member 451 is used to apply an elastic force to the first transmission link 441 and keep the first pressure block 410 abutting against the surface of the battery cell 2000. Utilizing the first driving ramp 431 of the driving mechanism 430, when the driving mechanism 430 moves along the second direction, it can generate a driving force on the first transmission link 441. The driving force can be decomposed into a component force in the first direction (e.g., ...). Figure 6 The negative x-axis (shown) and the component force in the second direction, the component force in the first direction can drive the first transmission link 441 to move along the first direction, thereby driving the first pressure block 410 away from the side of the battery cell 2000 along the first direction. At this time, the battery cell 2000 can be placed into the positioning mechanism 400, or the battery cell 2000 can be taken out of the positioning mechanism 400. The elastic force applied to the first transmission link 441 by the first reset member 451, the direction of the elastic force is opposite to the direction of the driving force of the drive mechanism 430 on the first transmission link 441, therefore, the first reset member 451 can make the first transmission link 441 move in the opposite direction of the first direction (e.g., the negative x-axis) and the component force in the second direction. The component force in the first direction can drive the first transmission link 441 to move in the opposite direction of the first direction (e.g., the negative x-axis) and the component force in the second direction. The component force in the first direction can drive the first transmission link 441 to move along ... Figure 6 As shown in the positive direction of the x-axis, the first transmission link 441 can drive the first pressure block 410 to remain in contact with the side of the battery cell 2000, thereby fixing the battery cell 2000 during the welding process.

[0057] In some embodiments, the positioning mechanism 400 further includes a second transmission link 442, a third transmission link 443, an inclined guide 444, and a second reset member 452. The driving mechanism 430 is provided with a second driving inclined surface 432, and the second driving inclined surface 432 and the first driving inclined surface 431 are distributed along the circumference of the driving mechanism 430. The second transmission link 442 is slidably connected to the second driving inclined surface 432. The third transmission link 443 connects the second transmission link 442 and the second pressure block 420. The inclined surface guide 444 is connected to the third transmission link 443. The second driving inclined surface 432 is used to drive the second transmission link 442 to move in the first direction when the driving mechanism 430 moves in the second direction. The inclined surface guide 444 is used to guide the third transmission link 443 to move in the second direction. The second pressure block 420 moves in the second direction and away from the surface of the battery cell 2000. The second reset member 452 is connected to the second transmission link 442. The second reset member 452 is used to apply an elastic force to the second transmission link 442 and keep the second pressure block 420 abutting against the surface of the battery cell 2000.

[0058] Using the second driving inclined surface 432 of the driving mechanism 430, when the driving mechanism 430 moves in the second direction, it can generate a driving force on the second transmission link 442. The driving force can be decomposed into a component force in the first direction and a component force in the second direction. The component force in the first direction can drive the second transmission link 442 to move in the first direction. The second transmission link 442 drives the third transmission link 443 to move. Due to the inclined guide 444, under the guidance of the inclined guide 444, the transmission force of the second transmission link 442 can be decomposed into a component force in the first direction and a component force in the second direction, thereby driving the third transmission link 443 to move in the second direction, thereby driving the second pressure block 420 to move away from the upper surface of the battery cell 2000 in the second direction. At this time, the battery cell 2000 can be placed into the positioning mechanism 400 or removed from the positioning mechanism 400. The elastic force applied to the second transmission link 442 by the second reset member 452 is opposite in direction to the driving force of the drive mechanism 430 on the second transmission link 442. Therefore, the second reset member 452 can make the second transmission link 442 move in the opposite direction of the first direction. The second transmission link 442 can drive the second pressure block 420 to remain in contact with the side of the battery cell 2000, thereby fixing the battery cell 2000 during the welding process.

[0059] The drive mechanism 430 is equipped with both a first drive ramp 431 and a second drive ramp 432, which enables the drive mechanism 430 to drive the first transmission link 441 and the second transmission link 442 to move simultaneously. Moreover, the second drive ramp 432 and the first drive ramp 431 are distributed along the circumference of the drive mechanism 430. In this way, the second transmission link 442 and the first transmission link 441 can be reasonably distributed on the outer periphery of the drive mechanism 430, avoiding mutual interference between the first transmission link 441 and the second transmission link 442.

[0060] For example, the drive mechanism 430 may include a lifting slider and a power structure such as a cylinder or a motor, wherein the cylinder drives the lifting slider to rise or fall in the second direction. The first transmission link 441 and the first drive inclined surface 431 can be connected by a pulley, which reduces the friction between them and improves the stability and reliability of the sliding connection between the first transmission link 441 and the first drive inclined surface 431. Similarly, the second transmission link 442 and the second drive inclined surface 432 can also be connected by a pulley, and the specific arrangement can be the same as that of the first transmission link 441, which will not be described again here. Optionally, the first reset member 451 and the second reset member 452 can be springs. The springs deform under compression, and during the spring's extension and recovery process, they push the first transmission link 441 and the second transmission link 442 to reset.

[0061] For the dual-tab battery cell 2000, both ends of the cell 2000 are provided with tabs 2100. When welding one side of the tab 2100, the other side of the tab 2100 needs to be fixed. Therefore, in some embodiments, the positioning mechanism 400 further includes a third clamping block 460, which is spaced apart from the first clamping block 410 and the second clamping block 420. The battery cell 2000 includes a first tab and a second tab disposed at both ends of the cell 2000. The first guide 100 is used to abut against the first tab, and the third clamping block 460 is used to clamp the second tab along a second direction. By using the third clamping block 460 to clamp the second tab of the battery cell 2000, the stability and accuracy of the battery cell 2000 during the welding process of the first tab can be further improved, and the displacement or damage of the second tab can be avoided. The first pressure block 410, the second pressure block 420 and the third pressure block 460 are arranged at intervals. On the one hand, this can make full use of the space on the positioning mechanism 400 to ensure that the three pressure blocks can abut against the corresponding positions of the battery cell 2000. On the other hand, it can ensure that the three pressure blocks work independently and avoid mutual interference.

[0062] Optionally, the third pressure block 460 can also be driven by the drive mechanism 430. The specific configuration of the drive mechanism 430 driving the third pressure block 460 can refer to the first pressure block 410 and the second pressure block 420. The drive mechanism 430 drives the third pressure block 460 away from the surface of the second electrode tab, which facilitates the insertion or removal of the battery cell 2000. During the soldering of the first electrode tab, the third reset member 453 can be used to drive the third pressure block 460 to reset, so that the third pressure block 460 can remain in contact with the surface of the second electrode tab.

[0063] In some embodiments, the positioning mechanism 400 includes a substrate 471 and a cell holder 472. The cell holder 472 is disposed on the substrate 471 and is used to accommodate the cell 2000. A first pressing block 410 and a second pressing block 420 are disposed around the cell holder 472. When the driving mechanism 430 drives the first pressing block 410 and the second pressing block 420 to move, the first pressing block 410 and the second pressing block 420 move away from the cell holder 472. The cell holder 472 can clamp the two sides of the cell 2000 together with the first pressing plate, and the cell holder 472 and the second pressing plate can clamp the upper and lower surfaces of the cell 2000 together. Therefore, the cell holder 472 can be used to further limit and fix the cell 2000, improve the stability and alignment accuracy of the cell 2000 during the electrode tab 2100 welding process, and improve the welding effect of the cell 2000.

[0064] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A welding fixture for battery cells with adjustable welding position, characterized in that: include A first guide member is used to abut against the part to be welded on the electrode tab. The first guide member is provided with a welding channel. The opening at the first end of the welding channel is aligned with the part to be welded. The welding channel allows the laser to pass through. A tab adjustment component is provided, which is movably disposed along the stacking direction of the battery cell. The tab adjustment component changes the length of the part to be welded by adjusting the depth of insertion into the tab fold.

2. The adjustable welding position battery cell welding fixture according to claim 1, characterized in that: The cell welding fixture further includes a second guide member, which has a guide portion that is plugged into the welding channel. The second guide member is movable relative to the first guide member so that the guide portion exits from the welding channel.

3. The adjustable welding position battery cell welding fixture according to claim 2, characterized in that: The welding channel has a first end and a second end that are arranged opposite to each other. The laser passes through the welding channel from the second end to the first end. The guide part is movable along the axial direction of the welding channel and can enter or exit the welding channel from the opening at the second end.

4. The adjustable welding position battery cell welding fixture according to claim 2, characterized in that: The sidewall of the welding channel is provided with an opening groove, and the guide part is movable radially along the welding channel. The guide part can enter or exit the welding channel through the opening groove.

5. The cell welding fixture with adjustable welding position according to any one of claims 1 to 4, characterized in that: The battery cell welding fixture also includes a positioning mechanism, which is located at the first end of the welding channel and is used to clamp the battery cell.

6. The adjustable welding position battery cell welding fixture according to claim 5, characterized in that: The positioning mechanism includes a driving structure and at least a first pressing block and a second pressing block. The first pressing block clamps the battery cell along a first direction, and the second pressing block clamps the battery cell along a second direction. The first direction and the second direction are perpendicular to each other. The driving mechanism simultaneously drives the first pressing block and the second pressing block to move.

7. The adjustable welding position battery cell welding fixture according to claim 6, characterized in that: The positioning mechanism further includes a first transmission link and a first reset member. One end of the first transmission link is connected to the first pressure block. The driving mechanism is provided with a first driving inclined surface. The other end of the first transmission link is slidably connected to the first driving inclined surface. The first driving inclined surface is used to drive the first transmission link to move in a first direction when the driving mechanism moves in a second direction. The first pressure block moves in the first direction and moves away from the surface of the battery cell. The first reset member is connected to the first transmission link. The first reset member is used to apply an elastic force to the first transmission link and keep the first pressure block abutting against the surface of the battery cell.

8. The adjustable welding position battery cell welding fixture according to claim 7, characterized in that: The positioning mechanism further includes a second transmission link, a third transmission link, an inclined guide, and a second reset component. The driving mechanism is provided with a second driving inclined surface, and the second driving inclined surface and the first driving inclined surface are distributed along the circumference of the driving mechanism. The second transmission link is slidably connected to the second driving inclined surface. The third transmission link connects the second transmission link and the second pressure block. The inclined surface guide is connected to the third transmission link. The second driving inclined surface is used to drive the second transmission link to move in the first direction when the driving mechanism moves in the second direction. The inclined surface guide is used to guide the third transmission link to move in the second direction. The second pressure block moves in the second direction and away from the cell surface. The second reset member is connected to the second transmission link. The second reset member is used to apply an elastic force to the second transmission link and keep the second pressure block abutting against the cell surface.

9. The adjustable welding position battery cell welding fixture according to claim 6, characterized in that: The positioning mechanism further includes a third pressure block, which is spaced apart from the first pressure block and the second pressure block. The battery cell includes a first electrode and a second electrode disposed at both ends of the battery cell. The first guide is used to abut against the first electrode, and the third pressure block is used to clamp the second electrode along a second direction.

10. The cell welding fixture with adjustable welding position according to any one of claims 6 to 9, characterized in that: The positioning mechanism includes a substrate and a cell holder. The cell holder is disposed on the substrate and is used to accommodate the cell. The first pressing block and the second pressing block are disposed around the cell holder. When the driving mechanism drives the first pressing block and the second pressing block to move, the first pressing block and the second pressing block move away from the cell holder.

11. A battery cell welding device, characterized in that: The device includes a laser assembly and a cell welding fixture with adjustable welding position as described in any one of claims 1 to 10, wherein the laser assembly is used to generate a laser and allow the laser to pass through the welding channel, and the laser is used to weld the tabs of the cell.

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