Battery cell gasket pressing device and battery cell gasket pressing system

Abstract

The application provides a battery cell tab pressing device and a battery cell tab pressing system. The battery cell tab pressing device comprises a fixed seat, a moving assembly, a floating assembly, a mounting base, a copper nozzle and a pre-pressing stabilizing assembly. The moving assembly is fixed to the fixed seat and is used to drive the floating assembly to move relative to the fixed seat. The floating assembly is located between the moving assembly and the mounting base. The copper nozzle and the pre-pressing stabilizing assembly are both mounted to the mounting base. The pre-pressing stabilizing assembly comprises a first elastic member and an insulating support block. The two ends of the first elastic member abut against the insulating support block and the mounting base respectively. The end face of the insulating support block away from the mounting base is flush with the end face of the copper nozzle away from the mounting base. The battery cell tab pressing device and the battery cell tab pressing system can improve the stability of the tab pressing process and the welding quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery manufacturing equipment, in particular to a battery cell tab pressing device and a battery cell tab pressing system. BACKGROUND

[0002] In the manufacturing process of the blade cell module, the metal tab is used to connect the adjacent cell poles. The tab pressing mechanism is the key equipment to ensure the close fit of the tab and the pole, and its performance has an important influence on the stability of the welding process and the quality of the final product.

[0003] Currently, copper nozzles are commonly used to press the tabs. In order to avoid short circuit between the cells caused by copper nozzle pressing, the common pressing schemes in the prior art include staggered pressing scheme (copper nozzles on both sides of the module are staggered, and there is a situation that the cell is pressed by one side) and empty position pressing scheme (both sides of the cell are pressed, but the pressed cells are arranged at intervals). In the staggered pressing scheme, when the copper nozzle presses the tab, the opposite side of the cell pressed by one side has no support, and if the pressing force is too large, the cell will move, and if the pressing force is too small, the tab will not fit well, and the welding quality cannot be guaranteed. In the empty position pressing scheme, due to the size tolerance and stacking position deviation of the cell itself, it is not possible to guarantee that all copper nozzles press the tab onto the pole, and if the pressing force is too large, the tab is easy to deform, resulting in abnormal welding quality.

[0004] Therefore, it is necessary to provide an improved battery cell tab pressing device and a battery cell tab pressing system to solve the above problems. SUMMARY

[0005] The present application provides a battery cell tab pressing device and a battery cell tab pressing system to improve the stability of the tab pressing process and the welding quality.

[0006] The present application discloses a battery cell tab pressing device, comprising a fixed seat, a moving assembly, a floating assembly, a mounting base, a copper nozzle and a pre-pressing stabilizing assembly, the moving assembly is fixed to the fixed seat and is used to drive the floating assembly to move relative to the fixed seat, and the floating assembly is located between the moving assembly and the mounting base; the copper nozzle and the pre-pressing stabilizing assembly are both mounted on the mounting base, the pre-pressing stabilizing assembly comprises a first elastic member and an insulating support block, the two ends of the first elastic member abut against the insulating support block and the mounting base respectively, and the end face of the insulating support block away from the mounting base is flush with the end face of the copper nozzle away from the mounting base.

[0007] Further, the mounting base comprises an outer frame, a floating matching frame and a mounting table, the inner and outer sides of the floating matching frame are connected with the mounting table and the outer frame respectively, the floating assembly is matched with the floating matching frame, and the mounting table is connected with the copper nozzle and the pre-pressing stabilizing assembly.

[0008] Further, the mounting table comprises a base, two copper nozzle mounting positions protruding from the base away from one side of the floating assembly, and two support block mounting positions protruding from the copper nozzle mounting positions to the left and right sides respectively; the two copper nozzles are mounted in the two copper nozzle mounting positions respectively, and one of the two support block mounting positions is provided with the pre-pressing stabilizing assembly.

[0009] Further, the pre-pressing stabilizing assembly further comprises a first guide rod, one end of the first guide rod is fixed to the support block mounting position, the first guide rod penetrates through the insulating support block and is relatively movable with the insulating support block, and the first elastic member is sleeved outside the first guide rod.

[0010] Further, the moving assembly, the mounting table and the copper nozzle are internally provided with a light emitting channel penetrating therethrough, and the cell tab pressing device further comprises a shielding cover, the shielding cover is located between the moving assembly and the mounting base, and the shielding cover is located between the light emitting channel and the floating assembly.

[0011] Further, one end of the shielding cover is fixed to the inner wall of the floating cooperation frame, and the other end of the shielding cover is in close contact with the inner wall of the moving assembly.

[0012] Further, the moving assembly comprises a driving member, a connecting member and a moving base, the driving member is fixed to the fixed seat, the connecting member connects the driving member and the moving base respectively, and the moving base is connected with the floating assembly; the driving member is used for driving the connecting member to move and driving the moving base to move.

[0013] Further, the moving assembly further comprises a slidingly matched guide rail and a sliding block, the guide rail is fixed to the fixed seat, and the sliding block is fixed to the moving base.

[0014] The application further discloses a cell tab pressing system, which comprises at least one pair of oppositely arranged cell tab pressing devices.

[0015] Further, each of the cell tab pressing devices comprises two copper nozzles and one pre-pressing stabilizing assembly, the two copper nozzles are a first copper nozzle and a second copper nozzle respectively; in a first direction, the arrangement order of the copper nozzle and the pre-pressing stabilizing assembly on one side is: the first copper nozzle, the second copper nozzle and the pre-pressing stabilizing assembly; and the arrangement order of the copper nozzle and the pre-pressing stabilizing assembly on the other side is: the pre-pressing stabilizing assembly, the first copper nozzle and the second copper nozzle.

[0016] The cell tab pressing equipment and the cell tab pressing system of the present application can provide a pre-supporting force through the pre-pressing stabilizing assembly comprising the first elastic member and the insulating supporting block, and can form a stable pressing area together with the copper nozzle, thereby effectively preventing the movement of the cell during the pressing stage and the welding process. Meanwhile, the multi-stage floating compensation mechanism formed by the combination of the floating assembly and the elastic design of the pre-pressing stabilizing assembly can automatically absorb and adapt to the thickness tolerance and position deviation of the cell stack, ensure the uniform and reliable pressing force applied at each welding point, ensure the uniform adhesion of the tab and the pole, improve the consistency of the welding quality, and improve the stability of the pressing process and the welding quality.

[0017] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0019] Figure 1 is a perspective view of the cell tab pressing equipment of the present application.

[0020] Figure 2 is a perspective view of part of the structure in Figure 1

[0021] Figure 3 is a side view of Figure 2

[0022] Figure 4 is a perspective view of part of the structure in Figure 2

[0023] Figure 5 is a perspective view of the mounting base in Figure 1

[0024] Figure 6 is a perspective view of the mounting base, the copper nozzle and the pre-pressing stabilizing assembly in Figure 5

[0025] Figure 7 is a perspective view from another angle. Figure 2

[0026] Figure 8 is a perspective view of the light shield cooperating with the mounting base and the moving assembly.

[0027] Figure 9 is a schematic view of the cell tab pressing system of the present application when pressing the tab. ​​​​​​

[0028] Reference Signs List:

[0029] 10, fixed seat; 11, upper fixed plate; 12, lower fixed plate; 20, moving assembly; 21, driving piece; 211, fixed part; 212, telescopic part; 22, connecting piece; 23, moving base; 231, main base; 232, upper moving plate; 233, lower moving plate; 24, guide rail; 25, sliding block; 30, floating assembly; 31, second elastic piece; 32, second guide rod; 40, mounting base; 41, outer frame; 42, floating matching frame; 43, mounting table; 431, base; 432, copper nozzle mounting position; 433, support block mounting position; 50, copper nozzle; 51, first copper nozzle; 52, second copper nozzle; 60, pre-pressing stabilizing assembly; 61, first elastic piece; 62, insulating support block; 63, first guide rod; 70, light emitting channel; 80, shielding cover; 91, tab; 92, pole. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments (or, “modes of implementation”) of the present application will be described clearly and completely below with reference to the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0031] If the application embodiments involve directional indications or positional relationships (for example, up, down, left, right, front, back, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships, movement conditions, etc. between components in a certain specific posture (as shown in the drawings); if the specific posture changes, the directional indications or positional relationships also change accordingly. In addition, the terms “first”, “second”, etc. in the application embodiments are only used for convenience of description, and cannot be understood as indicating or implying relative importance.

[0032] The embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the features in the following embodiments and modes of implementation can be supplemented or combined with each other.

[0033] As shown in FIG. 1, the present application provides a tab pressing device for pressing the tab 91 to the pole 92 of the blade cell and welding the tab 91 and the pole 92. The tab pressing device comprises a fixed seat 10, a moving assembly 20, a floating assembly 30, a mounting base 40, a copper nozzle 50, and a pre-pressing stabilizing assembly 60. Figures 1-2 The embodiments shown in FIG. 1 are two tab pressing devices arranged side by side. Figure 1

[0034] ​The fixed seat 10 is used to fix the whole cell gasket pressing device and connect with other devices (such as horizontal moving track or vertical moving track) in the process of assembling the cell module. The moving assembly 20 is fixed to the fixed seat 10 and used to drive the floating assembly 30 to move relative to the fixed seat 10.

[0035] Specifically, please refer to Figure 3 and Figure 4 , the moving assembly 20 includes a driving member 21, a connecting member 22 and a moving base 23. The driving member 21 is fixed to the fixed seat 10 and used to drive the connecting member 22 to move and further drive the moving base 23 to move. The driving member 21 is a cylinder and includes a fixed part 211 and an extension part 212. The extension part 212 can extend or retract relative to the fixed part 211. The fixed part 211 is fixed on the fixed seat 10, and the extension part 212 is connected with the connecting member 22 and can drive the connecting member 22 to move along the extension direction of the extension part 212. The connecting member 22 is connected with the driving member 21 and the moving base 23 respectively. The moving base 23 is connected with the floating assembly 30 to further drive the floating assembly 30 to move.

[0036] Further, the moving assembly 20 further includes a guide rail 24 and a sliding block 25. The guide rail 24 is fixed to the fixed seat 10 and arranged parallel to the extension direction of the extension part 212. The sliding block 25 is fixed to the moving base 23. The guide rail 24 and the sliding block 25 are in sliding fit to realize the smoothness of the movement of the moving assembly 20.

[0037] Specifically, the fixed seat 10 includes an upper fixed plate 11 above the moving base 23 and a lower fixed plate 12 below the moving base 23. The moving base 23 includes a main base 231, an upper moving plate 232 and a lower moving plate 233. The main base 231 is arranged perpendicular to the moving direction of the moving assembly 20. The upper moving plate 232 and the lower moving plate 233 are both arranged perpendicular to the main base 231 and connected to the upper and lower ends of the main base 231. The main base 231 is connected with the floating assembly 30, and the upper moving plate 232 is connected with the connecting member 22.

[0038] The guide rail 24 and the sliding block 25 are arranged above and below the moving base 23. The upper moving plate 232 is below the upper fixed plate 11, and the top of the upper moving plate 232 is provided with the sliding block 25. The bottom of the upper fixed plate 11 is correspondingly provided with the guide rail 24. The lower moving plate 233 is above the lower fixed plate 12, and the bottom of the lower moving plate 233 is provided with the sliding block 25. The top of the lower fixed plate 12 is correspondingly provided with the guide rail 24.

[0039] Thus, the upper and lower sides of the moving assembly 20 are guided by the guide rail 24 and the sliding block 25, ensuring that the moving base 23 moves linearly, greatly improving the movement accuracy and guidance of the moving base 23, without deviation or jamming, providing a guarantee for accurate pressing. At the same time, it also improves the overall structural stability, so that the reliability of the battery cell tab pressing equipment is improved.

[0040] The floating assembly 30 is located between the moving assembly 20 and the mounting base 40, and includes a second elastic member 31 and a second guide rod 32. One end of the second guide rod 32 is fixed to the mounting base 40, and the other end penetrates the main base 231 of the moving base 23 and is relatively movable with the main base 231. The second elastic member 31 is sleeved outside the second guide rod 32, and the two ends abut against the mounting base 40 and the moving base 23, respectively. In this embodiment, the second elastic member 31 is a spring, and the second guide rod 32 is a light axis bolt.

[0041] By setting the floating assembly 30, the position and angle of the mounting base 40, the copper nozzle 50 and the pre-pressing stabilizing assembly 60 can be adjusted to compensate for the height and angle deviation of the stacked battery cells, providing a guarantee for the forward pressing of the copper nozzle 50 and the tab 91 when the copper nozzle 50 is pressed, effectively improving the fitting accuracy of the copper nozzle 50 and the tab 91.

[0042] As Figure 5 And Figure 6 The mounting base 40 includes an outer frame 41, a floating matching frame 42 and a mounting table 43. The inner and outer sides of the floating matching frame 42 are connected with the mounting table 43 and the outer frame 41, respectively. The outer frame 41 is sleeved outside the floating matching frame 42, and the floating matching frame 42 is located outside the mounting table 43 and wraps the mounting table 43 from the side close to the floating assembly 30. The floating assembly 30 cooperates with the floating matching frame 42, and the second elastic member 31 abuts against the floating matching frame 42. The mounting table 43 is connected with the copper nozzle 50 and the pre-pressing stabilizing assembly 60.

[0043] Specifically, the mounting table 43 includes a base 431, two copper nozzle mounting positions 432 and two support block mounting positions 433. The base 431 is located inside the floating matching frame 42. The two copper nozzle mounting positions 432 are both protrudingly arranged from the base 431 to the side away from the floating assembly 30. The two support block mounting positions 433 are respectively protrudingly arranged from the copper nozzle mounting positions 432 to the left and right sides. The two copper nozzle mounting positions 432 are both mounted with the copper nozzle 50, and one of the two support block mounting positions 433 is mounted with the pre-pressing stabilizing assembly 60.

[0044] That is, four installation positions are formed on the installation base 43, two installation positions in the middle are copper nozzle installation positions 432, and two copper nozzles 50 are installed on the two copper nozzle installation positions 432. Two installation positions on the two sides are support block installation positions 433, and one of the two support block installation positions 433 is installed with a pre-pressing stabilizing assembly 60. In this way, on each installation base 43, a combination arrangement of “copper nozzle 50, copper nozzle 50, pre-pressing stabilizing assembly 60” or “pre-pressing stabilizing assembly 60, copper nozzle 50, copper nozzle 50” can be formed.

[0045] In the floating assembly 30, the number of the second elastic members 31 and the second guide rods 32 is eight, and each of the upper part and the lower part of each of the four installation positions of the installation base 43 corresponds to one second elastic member 31 and one second guide rod 32, respectively. When the tab 91 is pressed, each installation position can be supported by the elastic force of the second elastic member 31 along the moving direction of the moving assembly 20, so that the fitting accuracy of the copper nozzle 50 and the pre-pressing stabilizing assembly 60 with the tab 91 and the fitting accuracy of the tab 91 with the pole 92 are further improved.

[0046] The copper nozzle 50 and the pre-pressing stabilizing assembly 60 are both installed on the installation base 40. The copper nozzle 50 is fixed on the copper nozzle installation position 432 by a fixing member, and presses the tab 91 during the welding process of the tab 91 and the pole 92.

[0047] The pre-pressing stabilizing assembly 60 includes a first elastic member 61, an insulating support block 62, and a first guide rod 63. One end of the first guide rod 63 is fixed on the support block installation position 433, and the other end penetrates through the insulating support block 62 and can move relative to the insulating support block 62. The first elastic member 61 is sleeved outside the first guide rod 63, and the two ends thereof abut against the insulating support block 62 and the support block installation position 433 of the installation base 40, respectively. In the embodiment, the first elastic member 61 is a spring, and the first guide rod 63 is a light shaft bolt. Each insulating support block 62 corresponds to two first elastic members 61 and first guide rods 63.

[0048] The insulating support block 62 is made of high-strength insulating materials such as polyoxymethylene and bakelite, which fundamentally eliminates the risk of short circuit during the pressing process of the tab 91 and improves the operation safety. The end face of the insulating support block 62 away from the installation base 40 is flush with the end face of the copper nozzle 50 away from the installation base 40. In this way, the insulating support block 62 can contact the tab 91 synchronously with the copper nozzle 50 and provide a pre-supporting force, prevent the battery cell from moving or the tab 91 from deforming during the pressing stage, and improve the overall pressing stability and welding quality consistency of the equipment.

[0049] Meanwhile, the first elastic member 61 is combined with the elastic design of the floating assembly 30 to form a multi-stage floating compensation mechanism, which can automatically absorb and adapt to the thickness tolerance and position deviation of the cell stack, ensure that uniform and reliable pressing force can be applied at each welding point, further prevent the cell from shifting, and improve the pressing fit and welding quality.

[0050] As shown in Figure 7 and Figure 8 , the mobile assembly 20, the mounting table 43 and the copper nozzle 50 are internally provided with a light outlet channel 70 penetrating along the moving direction of the mobile assembly 20, which is used to provide a light path for laser welding of the tab 91 and the pole 92. The cell tab pressing equipment further comprises a shielding cover 80. The shielding cover 80 is located between the mobile assembly 20 and the mounting base 40, and between the light outlet channel 70 and the floating assembly 30, so as to prevent the welding slag splashed during the welding of the tab 91 and the pole 92 from falling onto the floating assembly 30, causing the copper nozzle 50 and the pre-pressing stabilizing assembly 60 to be pressed and stuck, improving the operation reliability of the cell tab pressing equipment, and prolonging the service life of the cell tab pressing equipment.

[0051] Specifically, one end of the shielding cover 80 close to the copper nozzle 50 is fixed to the inner wall of the floating matching frame 42 by fasteners, and the other end of the shielding cover 80 away from the copper nozzle 50 is tightly attached to the inner wall of the main base 231 of the mobile assembly 20, forming a dynamic sealing structure that can always maintain good shielding effect with the movement or floating of the mounting base 40.

[0052] The present application also provides a cell tab pressing system, which comprises at least one pair of cell tab pressing equipment as described above. A pair of cell tab pressing equipment is arranged oppositely, and simultaneously presses the tab 91 from both sides of the cell. Each cell tab pressing equipment comprises two copper nozzles 50 and one pre-pressing stabilizing assembly 60, and the two copper nozzles 50 are respectively a first copper nozzle 51 and a second copper nozzle 52. The first copper nozzle 51 and the second copper nozzle 52 are completely identical in structure.

[0053] As shown in Figure 9 , along the first direction, the arrangement order of the copper nozzle 50 and the pre-pressing stabilizing assembly 60 on one side is: the first copper nozzle 51, the second copper nozzle 52, the pre-pressing stabilizing assembly 60, and the arrangement order of the copper nozzle 50 and the pre-pressing stabilizing assembly 60 on the other side is: the pre-pressing stabilizing assembly 60, the first copper nozzle 51, and the second copper nozzle 52. The pole 92 on both sides of each cell can be supported by the copper nozzle 50 or the pre-pressing stabilizing assembly 60, avoiding the problem of cell shifting. At the same time, since there is no gap between the copper nozzle 50 and the pre-pressing stabilizing assembly 60, the two pressing points of each side tab 91 matched with the pole 92 can be pressed, and the tab 91 will not be deformed due to uneven force, further improving the welding quality.

[0054] Since each cell tab pressing device in the embodiment provides two copper nozzles 50 and one pre-pressing stabilizing assembly 60. In the process of cell production, after each welding, the cell module is moved two steps or the cell tab pressing device is moved two steps, and then the full welding of the cell pole 92 and the tab 91 is realized.

[0055] The cell tab pressing device and the cell tab pressing system of the present application can provide a pre-pressing stabilizing assembly 60 containing a first elastic member 61 and an insulating support block 62, which is installed side by side with the copper nozzle 50 and flush with the end face, and can work together during the pressing process. The insulating support block 62 can provide a pre-supporting force in advance, and together with the copper nozzle 50 forms a stable pressing area, effectively preventing the cell from moving during the pressing stage and the welding process. At the same time, the elastic design of the floating assembly 30 and the pre-pressing stabilizing assembly 60 constitutes a multi-stage floating compensation mechanism, which can automatically absorb and adapt to the thickness tolerance and position deviation of the cell stack, ensure that uniform and reliable pressing force can be applied at each welding point, ensure the uniform fit of the tab 91 and the pole 92, improve the consistency of the welding quality, and improve the stability of the pressing process and the welding quality.

[0056] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of the present application is not limited to the precise structure described in the above embodiments and shown in the accompanying drawings; any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery cell pressing device, characterized in that, The device includes a fixed base, a movable component, a floating component, a mounting base, copper nozzles, and a pre-pressure stabilizing component. The movable component is fixed to the fixed base and is used to move the floating component relative to the fixed base. The floating component is located between the movable component and the mounting base. The copper nozzles and the pre-pressure stabilizing component are both mounted on the mounting base. The pre-pressure stabilizing component includes a first elastic element and an insulating support block. The two ends of the first elastic element abut against the insulating support block and the mounting base, respectively. The end face of the insulating support block away from the mounting base is flush with the end face of the copper nozzle away from the mounting base. The battery cell pressing device includes two copper nozzles and one pre-pressure stabilizing component. The two copper nozzles are a first copper nozzle and a second copper nozzle, and their arrangement order is: first copper nozzle, second copper nozzle, pre-pressure stabilizing component.

2. The battery cell pressing device according to claim 1, characterized in that, The mounting base includes an outer frame, a floating mating frame, and a mounting platform. The inner and outer sides of the floating mating frame are connected to the mounting platform and the outer frame, respectively. The floating component mates with the floating mating frame, and the mounting platform is connected to the copper nozzle and the pre-pressure stabilizing component.

3. The battery cell pressing device according to claim 2, characterized in that, The mounting platform includes a base, two copper nozzle mounting positions protruding from the base away from the floating component, and two support block mounting positions protruding to the left and right sides respectively from the copper nozzle mounting positions; the copper nozzle is installed in each of the two copper nozzle mounting positions, and the pre-pressure stabilizing component is installed in one of the two support block mounting positions.

4. The battery cell pressing device according to claim 3, characterized in that, The pre-compression stabilizing component further includes a first guide rod, one end of which is fixed to the support block mounting position. The first guide rod passes through the insulating support block and is movable relative to the insulating support block. The first elastic element is sleeved on the outside of the first guide rod.

5. The battery cell pressing device according to claim 2, characterized in that, The moving component, the mounting platform, and the copper nozzle are provided with a through light emission channel. The battery cell pressing device also includes a shield, which is located between the moving component and the mounting base, and between the light emission channel and the floating component.

6. The battery cell pressing device according to claim 5, characterized in that, One end of the shield is fixed to the inner wall of the floating mating frame, and the other end of the shield is in close contact with the inner wall of the moving component.

7. The battery cell pressing device according to claim 1, characterized in that, The moving component includes a driving component, a connecting component, and a moving base. The driving component is fixed to the fixed base. The connecting component connects the driving component and the moving base respectively. The moving base is connected to the floating component. The driving component is used to drive the connecting component to move and drive the moving base to move.

8. The battery cell pressing device according to claim 7, characterized in that, The moving component also includes a sliding guide rail and a slider, the guide rail being fixed to the fixed base and the slider being fixed to the moving base.

9. A battery cell plate voltage matching system, characterized in that, It includes at least one pair of oppositely arranged cell clamping devices as described in any one of claims 1-8.

10. The cell plate voltage matching system according to claim 9, characterized in that, Along the first direction, the copper nozzle and the pre-pressure stabilizing component are arranged in the following order on one side: first copper nozzle, second copper nozzle, pre-pressure stabilizing component; the copper nozzle and the pre-pressure stabilizing component are arranged in the following order on the other side: pre-pressure stabilizing component, first copper nozzle, second copper nozzle.

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