Battery cell tab laser welding pressing device and system

Abstract

The utility model discloses a cell tab laser welding hold-down device and system, the hold-down device comprises a driving assembly and a hold-down assembly, the driving assembly comprises a first driving mechanism and a second driving mechanism, the bottom end of the hold-down assembly is provided with a rolling piece, and the second driving mechanism is connected with the hold-down assembly to drive the hold-down assembly to roll in the horizontal direction; the first driving mechanism is connected with the second driving mechanism so as to drive the pressing assembly to press up and down in the vertical direction. The first driving mechanism drives the rolling piece of the pressing assembly to press down the battery cell tab, the second driving mechanism is matched to drive the rolling piece of the pressing assembly to move back and forth in the horizontal direction, and under the combined action of the first driving mechanism and the second driving mechanism, laser welding of the battery cell tab is achieved. And the pressing assembly rolls the battery cell tab to flatten the wrinkles of the battery cell tab, so that the technical problem that the soft package battery cell tab is not flat in the laser welding process in the prior art is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery processing, and particularly relates to a laser welding pressing device and system for battery cell tabs. Background Art

[0002] In the prior art, batteries are connected in series and parallel through tabs and busbars to achieve over-current connection of the whole battery pack. In this process, laser welding is widely used due to its advantages such as high efficiency, precision, and small heat-affected zone. However, the laser welding process has extremely high requirements for controlling the gap between welding materials. Especially when the gap exceeds 20% of the thickness of the material itself (e.g., 0.2 mm for tabs with a thickness of 0.2 to 0.4 mm), it is extremely easy to cause poor welding, such as false welding, seriously affecting the safety and service life of the battery pack.

[0003] In the actual production process of batteries, usually, after the battery is fixed, the tabs and busbars are pressed and welded through a pressing plate with a dust-absorbing copper nozzle. However, compared with square power battery cells, due to the thinner tab thickness and structural fragility of soft-pack power battery cells, the tab bearing capacity of soft-pack battery cells is usually poor, and it is extremely easy to occur phenomena such as wrinkling, bulging, and unevenness during the pressing process before welding, which not only increases the welding difficulty but also easily leads to uneven heat distribution during welding, further increasing the risk of welding through or false welding. At the same time, most of the existing laser welding processing jigs or pressing mechanisms for soft-pack power battery cells are made of rigid body materials, which are extremely easy to damage the tabs of soft-pack battery cells. Therefore, how to ensure the flatness of the tabs of soft-pack battery cells in the laser welding process has become an important research topic for improving welding quality and ensuring the performance of the battery pack.

[0004] Therefore, the present application aims to propose a new laser welding pressing device and system for battery cell tabs to solve the above problems. Summary of the Utility Model

[0005] The main object of the utility model is to provide a laser welding pressing device and system for battery cell tabs, aiming to solve the technical problem that the tabs of battery cells are uneven in the laser welding process in the prior art, thereby affecting the safety and service life of the battery pack.

[0006] To achieve the above-mentioned utility model object, on the one hand, the utility model proposes a laser welding pressing device for battery cell tabs, which includes a driving component and a pressing component. The driving component includes a first driving mechanism and a second driving mechanism. A rolling member is provided at the bottom end of the pressing component. The second driving mechanism is connected to the pressing component to drive the pressing component to roll in the horizontal direction. The first driving mechanism and the second driving mechanism are connected to drive the pressing component to press up and down in the vertical direction.

[0007] Further, the pressing assembly includes a first connecting member, the second driving mechanism includes a second driving member and a second connecting member, the second connecting member is rotatably connected to the first connecting member, and the second driving member is fixedly connected to the second connecting member to drive the first connecting member to move in the horizontal direction.

[0008] Further, the first connecting member is provided with at least one first mounting hole corresponding to the bottom of the second connecting member, a first buffer is installed in the first mounting hole, and the first buffer is movably abutted against the bottom of the second connecting member.

[0009] Further, the second driving mechanism further includes a third connecting member, the third connecting member is fixedly connected to the second driving member, and the third connecting member is movably connected to the second connecting member.

[0010] Further, the third connecting member is provided with at least one second mounting hole corresponding to the top of the first connecting member, a second buffer is installed in the second mounting hole, and the second buffer is movably abutted against the top of the first connecting member.

[0011] Further, the pressing assembly further includes a pressing member, the pressing member is detachably connected to the first connecting member, and the rolling member is arranged at the bottom end of the pressing member.

[0012] Further, the pressing assembly further includes a dust suction member, and the dust suction member is detachably connected to the pressing member.

[0013] Further, a slope is arranged at the bottom of the dust suction member, a cleaning member is installed on the slope, and the cleaning member is arranged opposite to the rolling member to clean the surface of the rolling member.

[0014] Further, the pressing member is provided with a support arm, and the support arm is rotatably connected to the rolling member.

[0015] Further, the support arms are respectively arranged at both ends of the bottom of the pressing member, both ends of the rolling member are respectively rotatably connected to the two support arms, an opening is jointly formed by the support arms, the main body of the pressing member and the rolling member, the dust suction member is provided with a dust suction port, and the dust suction port and the opening are arranged opposite to each other and are in fit.

[0016] Further, the first driving mechanism includes a first driving member and a fixed seat, the first driving member is slidably connected to the fixed seat; the fixed seat is fixedly connected to the third connecting member through a sliding column, and the first driving member is slidably connected to the third connecting member.

[0017] In order to achieve the above-mentioned utility model purpose, a second aspect of the present utility model proposes a cell tab laser welding pressing system, which includes two cell tab laser welding pressing devices as described above, and the two pressing devices are arranged opposite to each other.

[0018] Beneficial effects:

[0019] Compared with the prior art, a laser welding pressing device for a battery cell tab of an embodiment of the present application includes a driving component and a pressing component. The driving component includes a first driving mechanism and a second driving mechanism. A rolling member is provided at the bottom end of the pressing component. The second driving mechanism is connected to the pressing component to drive the pressing component to roll in the horizontal direction. The first driving mechanism and the second driving mechanism are connected to drive the pressing component to press up and down in the vertical direction. A rolling member is provided at the bottom end of the pressing component, and the second driving mechanism is connected to the pressing component so that when the second driving mechanism operates, it can drive the pressing component to move back and forth in the horizontal direction. And the first driving mechanism is connected to the second driving mechanism so that when the first driving mechanism operates, it can drive the second driving mechanism to move back and forth in the vertical direction. Since the second driving mechanism is connected to the pressing component, when the second driving mechanism moves back and forth, it can drive the pressing component to move back and forth in the vertical direction to realize the pressing of the battery cell tab by the pressing component in the vertical direction, and under the combined action of the first driving mechanism and the second driving mechanism, before laser welding of the battery cell tab, the pressing component rolls the battery cell tab to flatten the wrinkles of the battery cell tab. It can effectively solve the technical problem that the soft package battery cell tab is uneven in the laser welding process in the prior art, thereby affecting the safety and service life of the battery pack.

[0020] Compared with the prior art, a laser welding pressing system for a battery cell tab of an embodiment of the present application includes the above-mentioned laser welding pressing device for a battery cell tab, and two pressing devices are arranged opposite to each other. It can be understood that the laser welding pressing system for a battery cell tab of the present application can include all the technical features and technical effects of the above-mentioned pressing device, which will not be elaborated here. Description of the drawings

[0021] Figure 1 Schematic three-dimensional structure diagram of the pressing device according to an embodiment of the present invention;

[0022] Figure 2 Another schematic three-dimensional structure diagram of the pressing device according to an embodiment of the present invention;

[0023] Figure 3 Another schematic three-dimensional structure diagram of the pressing device according to an embodiment of the present invention;

[0024] Figure 4 Schematic three-dimensional structure diagram of the connection position between the second driving mechanism and the pressing component according to an embodiment of the present invention;

[0025] Figure 5 Front view of the pressing device according to an embodiment of the present invention;

[0026] Figure 6 Schematic diagram of the three-dimensional structure of the connection position between the dust suction part and the pressing part in an embodiment of the present utility model;

[0027] Figure 7 Schematic three-dimensional diagram of the pressing device pressing the electrode tab and the bus bar of the battery cell in an embodiment of the present utility model;

[0028] Figure 8 Side view of the pressing mechanism pressing the electrode tab and the bus bar of the battery cell in an embodiment of the present utility model;

[0029] Figure 9 Schematic diagram of the leveling and welding of the electrode tab and the bus bar of the battery cell provided in an embodiment of the present utility model.

[0030] Wherein:

[0031] 1. Pressing assembly; 10. Rolling part; 110. First mounting hole; 11. First connecting part; 12. Pressing part; 120. Support arm; 121. Opening; 13. Dust suction part; 130. Inclined surface; 131. Dust suction port; 14. Cleaning part;

[0032] 2. Driving assembly; 20. First driving mechanism; 200. First driving part; 201. Fixed seat; 21. Second driving mechanism; 210. Second driving part; 211. Second connecting part; 212. Third connecting part; 2120. Second mounting hole;

[0033] 3. First buffer;

[0034] 4. Second buffer;

[0035] 5. Sliding column;

[0036] 6. Bus bar;

[0037] 7. Electrode tab of battery cell;

[0038] 8. Scanning lens;

[0039] 9. Pressing device.

[0040] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0041] It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0042] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically and clearly defined.

[0043] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0044] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0045] The soft-pack battery cell mainly includes a positive electrode tab, a negative electrode tab, an electrolyte, a separator, and a casing. Exemplarily, the positive electrode tab and the negative electrode tab of the soft-pack battery are respectively arranged at both ends of the battery cell and extend out of the casing for connection with an external circuit. Inside the battery cell, the positive electrode tab and the negative electrode tab are connected to the current collectors (such as aluminum foil and copper foil) inside the battery cell to facilitate connection with the internal circuit of the battery cell, thereby achieving the purpose of leading the current out of the casing. During the charge and discharge process of the soft-pack battery cell monomer, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode of the battery cell. The separator is arranged between the positive electrode and the negative electrode to prevent the positive electrode and the negative electrode from directly contacting, playing a role in preventing the positive electrode and the negative electrode from short-circuiting, and at the same time allowing the active ions to pass through. The electrolyte plays a role in conducting the active ions between the positive electrode and the negative electrode. The present application does not specifically limit the type of the electrolyte, and it can be selected according to the actual application scenario and requirements.

[0046] When the soft-pack battery cell is applied to an electric vehicle, since the voltage and capacity of a single battery cell are limited, usually single battery cells with parameters such as capacity, voltage, and internal resistance as consistent as possible are grouped by series or parallel arrangement to form a battery or a battery module that meets the actual requirements. In the prior art, when the soft-pack battery cell monomers are grouped, usually the positive electrode tabs and the negative electrode tabs between multiple single battery cells are connected through a bus bar, that is, the single battery cells are connected in series through the bus bar. It can also be that the positive electrode tabs and the negative electrode tabs between multiple single battery cells are respectively connected through a bus bar, that is, the single battery cells are connected in parallel through the bus bar. Usually, welding or plugging is used to connect the battery cell tabs and the bus bar. Among them, when welding, usually a laser device is used to weld the battery cell tab and the bus bar together. When welding, in order to limit the welding position and ensure the welding accuracy and stability, usually a copper nozzle is used to press the battery cell tab and the bus bar during the welding process. When laser welding, not only the welding position of the battery cell tab and the bus bar is limited within the range of the copper nozzle, but also the battery cell tab and the bus bar can be pressed tightly, which helps to improve the welding quality.

[0047] However, the inventor found that in actual production, the thickness of the soft-pack battery cell tab is between 0.2 and 0.4 mm, and its own structural strength is not high. When using the copper nozzle to press down the battery cell tab, since the copper nozzle is usually a rectangular ring or a circular ring, wrinkles, bulges and other uneven surfaces of the battery cell tab usually appear in the part that is not pressed tightly inside the ring, so that a gap appears between the battery cell tab and the bus bar. After laser welding, a series of welding defects such as virtual welding and explosion welding will occur, affecting the performance of the battery after grouping. Exemplarily, such as the current-carrying capacity at the welding point is reduced, and the heat dissipation capacity at the welding point is reduced.

[0048] To solve the problem of the unevenness of the tabs of the soft-pack battery cell during the laser welding process, the embodiment of the present application provides a laser welding pressing device for the tabs of the battery cell. The first driving mechanism drives the rolling member of the pressing assembly to press down the tab of the battery cell, and cooperates with the second driving mechanism to drive the rolling member of the pressing assembly to move back and forth in the horizontal direction. Under the combined action of the first driving mechanism and the second driving mechanism, before the laser welding of the tab of the battery cell, the pressing assembly rolls and presses the tab of the battery cell to flatten the wrinkles of the tab of the battery cell, effectively solving the technical problem of the unevenness of the tab of the soft-pack battery cell in the laser welding process. The following will describe in detail the laser welding pressing device for the tabs of the battery cell in the embodiment of the present application with reference to the accompanying drawings.

[0049] Please refer to Figures 1 to 9 , in this embodiment, a laser welding pressing device for the tabs of the battery cell is provided, including a driving assembly 2 and a pressing assembly 1. The driving assembly 2 includes a first driving mechanism 20 and a second driving mechanism 21. A rolling member 10 is provided at the bottom end of the pressing assembly 1. The second driving mechanism 21 is connected to the pressing assembly 1 to drive the pressing assembly 1 to roll in the horizontal direction; the first driving mechanism 20 and the second driving mechanism 21 are connected to drive the pressing assembly 1 to press down in the vertical direction.

[0050] In this embodiment, the pressing assembly 1 is the core of the pressing device. In the embodiment of the present application, the pressing assembly 1 has two functions. One is to stably press the tab of the power battery cell at a predetermined position during the laser welding process to prevent the tab of the battery cell 7 from displacing or misaligning during the laser welding process; the other is to flatten the tab of the battery cell 7 before pressing the tab of the battery cell 7 against the bus bar 6. Specifically, a rolling member 10 is provided at the bottom end of the pressing assembly 1 of the present application for rolling and pressing the tab of the battery cell 7. Exemplarily, the rolling member 10 can be a roller shaft or a roller. When the rolling member 10 is provided at the bottom end of the pressing member 12, it can be realized that the rolling member 10 rotates along the radial cross-section of the fixed shaft by passing the fixed shaft through the rolling member 10 and fixing both ends of the fixed shaft at the bottom end of the pressing assembly 1, or it can be realized that the rolling member 10 rotates along the radial cross-section of the fixed shaft by fixing one end of the fixed shaft, thereby realizing the purpose of the rolling member 10 to roll. The second driving mechanism 21 is connected to the pressing assembly 1 in the horizontal direction. The second driving mechanism 21 is used to provide a driving force in the horizontal direction for the pressing assembly 1 to drive the movement of the pressing assembly 1 in the horizontal direction and cooperate with the pressing assembly 1 to realize the function of the rolling member 10 to move back and forth in the horizontal direction. The first driving mechanism 20 and the second driving mechanism 21 are connected. The first driving mechanism 20 is used to drive the second driving mechanism 21 to move back and forth in the vertical direction. At the same time, since the second driving mechanism 21 is connected to the pressing assembly 1, when the first driving mechanism 20 drives the second driving mechanism 21 to move at the vertical end, the pressing assembly 1 is also driven to move up and down at the vertical end.

[0051] In the above embodiments, the cell tab 7 is the part that leads out the positive and negative electrodes in a single cell, and the bus bar 6 is a structural member for conducting current, such as an aluminum connecting piece, a copper connecting piece, etc.; after the cell tab 7 is connected to the bus bar 6, it can provide a stable electron conduction path for the charging and discharging process of the battery, enabling current to flow into or out of the cells of the battery. Specifically, multiple single cells are connected in series through the bus bar 6 to form a cell stack. The cell tab laser welding and pressing device provided in this application is used in the pre-pressing process of welding the cell tab 7 to the bus bar 6 when multiple single cells are connected in series through the bus bar 6; before pre-pressing, first place the bus bar 6 on the auxiliary bracket, then stack the cell tab 7 on the bus bar 6, and then use the cell tab laser welding and pressing device provided in this application for leveling and pressing, and finally perform laser welding. Among them, when using the cell tab laser welding and pressing device provided in this application for pressing, the first driving mechanism 20 drives the rolling member 10 of the pressing assembly 1 to press down the cell tab 7, and then the second driving mechanism 21 starts to act to drive the rolling member 10 of the pressing assembly 1 to roll in the length direction of the cell tab 7 to achieve the purpose of rolling and leveling the cell tab 7. After rolling and leveling the cell tab 7, the rolling member 10 presses the cell tab 7 under the action of the first driving mechanism 20, and then laser welding of the cell tab 7 and the bus bar 6 is performed.

[0052] It should be noted that when the pressing assembly 1 presses the cell tab 7, it can be vertical pressing, or the pressing assembly 1 can press the cell tab 7 obliquely. This application does not limit the way the pressing assembly 1 presses the cell tab 7 and can be set according to actual application requirements. It can be understood that since the second driving member 210 can more easily control the direction and force of the pressing member 12 when the pressing assembly 1 presses the cell tab 7 obliquely, which helps to make the force more uniform during the process of rolling the cell tab 7 back and forth, so this application preferably adopts the pressing assembly 1 to press the cell tab 7 obliquely downward.

[0053] In the above embodiments, a rolling member 10 is provided at the bottom end of the pressing assembly 1, and the second driving mechanism 21 is connected to the pressing assembly 1 so that when the second driving mechanism 21 operates, it can drive the pressing assembly 1 to move back and forth in the horizontal direction. Moreover, the first driving mechanism 20 is connected to the second driving mechanism 21 so that when the first driving mechanism 20 operates, it can drive the second driving mechanism 21 to move back and forth in the vertical direction. Since the second driving mechanism 21 is connected to the pressing assembly 1, when the second driving mechanism 21 moves back and forth, it can drive the pressing assembly 1 to move back and forth in the vertical direction, so as to realize that the pressing assembly 1 presses the battery cell tab 7 in the vertical direction. Under the combined action of the first driving mechanism 20 and the second driving mechanism 21, before laser welding of the battery cell tab 7, the pressing assembly 1 rolls the battery cell tab 7 to flatten the wrinkles of the battery cell tab 7. It can effectively solve the technical problem that the soft-pack battery cell tab 7 is uneven in the laser welding process in the prior art, thereby affecting the safety and service life of the battery pack.

[0054] Please refer to Figures 1 to 9 , in an embodiment, the pressing assembly 1 includes a first connecting member 11, and the second driving mechanism 21 includes a second driving member 210 and a second connecting member 211. The second connecting member 211 is rotatably connected to the first connecting member 11, and the second driving member 210 is fixedly connected to the second connecting member 211 to drive the first connecting member 11 to move in the horizontal direction.

[0055] In this embodiment, the first connecting member 11 in the pressing assembly 1 is used to achieve a horizontal connection with the second connecting member 211 in the second driving mechanism 21, and the first connecting member 11 and the second connecting member 211 are rotatably connected through a bearing. The second connecting member 211 in the second driving mechanism 21 is used to be fixedly connected to the first connecting member 11 and the second driving member 210 in the pressing assembly 1 respectively. When the second connecting member 211 is respectively connected to the first connecting member 11 and the second driving member 210, when the second driving member 210 operates, it can transmit power to the second connecting member 211. Since the second connecting member 211 is simultaneously connected to the first connecting member 11, therefore, the power of the second driving member 210 can be transmitted to the first connecting member 11 through the second connecting member 211. At the same time, both the first connecting member 11 and the second driving member 210 are connected to the second connecting member 211, so the first connecting member 11 can be moved in the horizontal direction, and further the purpose of driving the rolling member 10 in the pressing assembly 1 to move back and forth in the horizontal direction by the second driving mechanism 21 can be achieved.

[0056] Furthermore, the first connecting member 11 is provided with at least one first mounting hole 110 corresponding to the bottom of the second connecting member 211, and a first buffer 3 is installed in the first mounting hole 110, and the first buffer 3 is movably abutted against the bottom of the second connecting member 211.

[0057] In the above embodiment, the first buffer 3 is used to absorb the impact energy between the second connecting member 211 and the first connecting member 11, slow down the transmission of vibration, and limit the rotatable range between the first connecting member 11 and the second connecting member 211 through the bearing. When the second driving member 210 drives the second connecting member 211 to move in the horizontal direction, this movement will be transmitted to the first connecting member 11 that is movably connected to the second connecting member 211. Since the movement between mechanical components is often accompanied by impact and vibration, the presence of the first buffer 3 can effectively absorb this impact energy and slow down the transmission of vibration, thereby making the movement of the entire mechanical system more stable. Further, two first mounting holes 110 may be provided on the first connecting member 11. The first buffer 3 is provided in both of the two first mounting holes 110, and the first buffer 3 is located at both ends of the first connecting member 11. The first buffers 3 at both ends are uniformly and movably abutted against the second connecting member 211. The two provided first buffers 3 cooperate with each other to maintain the balance of the first connecting member 11, so that the first connecting member 11 is always in a horizontal state. Furthermore, it can ensure that the rolling members 10 at the bottom in the pressing assembly 1 maintain a relatively horizontal state, and ensure that the rolling members 10 can closely fit the electrode tabs 7 of the battery cell.

[0058] In actual application, for example, the upper part of the first connecting member 11 can be a "⊥"-like structure, and the part of the second connecting member 211 connected to the first connecting member 11 can be a rectangular block structure. When the first connecting member 11 is connected to the second connecting member 211, the vertical section of the "⊥" structure of the first connecting member 11 is connected to the second connecting member 211, wherein the second connecting member 211 can be provided with a threaded hole, and the vertical section of the "⊥" structure can be provided with a through hole, which can be threadedly connected and fixed to the threaded hole on the second connecting member 211 by a bolt with a thread on the bottom passing through the through hole, and the bolt and the through hole are connected by a bearing to enable the first connecting member 11 to rotate in the radial section of the bolt, thereby realizing the function of relative rotation when the second connecting member 211 is connected to the first connecting member 11. When the second driving member 210 is connected to the second connecting member 211, it can be located on the same side of the second connecting member 211 as the first connecting member 11, or on two opposite sides of the second connecting member 211. The present application does not make any specific restrictions on the positions at which the first connecting member 11 and the second driving member 210 are respectively connected to the second connecting member 211, as long as the connection between the three is satisfied. The present application preferably adopts the arrangement in which the first connecting member 11 and the second driving member 210 are respectively located on two opposite sides of the second connecting member 211. It can be understood that this arrangement can connect the first connecting member 11 and the second connecting member 211 to the second driving member 210 as a whole, which facilitates the driving of the second driving member 210 and makes the disassembly and assembly of the second driving member 210 easier. It can be understood that the upper part of the first connecting member 11 is a "⊥" vertical section that can be connected to other components, and the horizontal section that can be connected to other components, which is convenient for the connection of other components, that is, the first mounting hole 110 of the present application is arranged on the horizontal section on one side of the "⊥" structure, and is arranged at the front and rear ends of the horizontal section. The first buffer 3 is arranged in the first mounting hole 110 and abuts against the second connecting member 211, so that in the process of leveling the battery cell tab 7, even if an uneven or irregularly shaped tab surface is encountered, the first buffer 3 can effectively reduce the shaking or deviation caused by uneven force, thereby ensuring the stability and accuracy of leveling and pressing. Specifically, the second driving member 210 can be a motor, a cylinder or any other driving device. The present application does not limit the type of the second driving member 210. When the second driving member 210 is connected to the second connecting member 211, it can be a bolt-matched threaded hole or a nut fixed connection.

[0059] In the above embodiment, the second connecting member 211 is movably connected to the first connecting member 11, and the second driving member 210 is fixedly connected to the second connecting member 211. This not only enables the second driving member 210 to drive the first connecting member 11 to move in the horizontal direction, but also enables the first connecting member 11 to move relative to the second connecting member 211. At the same time, a first buffer 3 is installed in the first mounting hole 110 of the first connecting member 11, and the first buffer 3 is in movable abutment with the second connecting member 211, which can ensure that the rolling member 10 in the pressing assembly 1 is in a horizontal state, can adaptively adjust the fitting degree between the rolling member 10 and the electrode tab 7 of the battery cell, and ensure that the rolling member 10 can stably roll and press the electrode tab 7 of the battery cell.

[0060] Please refer to Figures 1 to 9 , in one embodiment, the second driving mechanism 21 further includes a third connecting member 212. The third connecting member 212 is fixedly connected to the second driving member 210, and the third connecting member 212 is movably connected to the second connecting member 211.

[0061] In this embodiment, the third connecting member 212 is used to fix the second driving member 210 and connect to the second connecting member 211. Further, the second connecting member 211, the third connecting member 212 and the second driving member 210 are connected to form an integral body, and after forming an integral body, it can be used to connect to the first driving mechanism 20. The movable connection between the third connecting member 212 and the second connecting member 211 is used to ensure that the second connecting member 211 can move when the second driving member 210 drives the second connecting member 211 to move.

[0062] In actual application of the above embodiments, for example, when the second connecting member 211 is movably connected to the third connecting member 212, a concave chute or a convex slider may be provided on the second connecting member 211, and a corresponding convex slider or a concave chute may be provided on the third connecting member 212. The sliding connection is achieved through the cooperation of the chute and the slider. As can be seen from the above content, the second driving member 210 is fixedly connected to the second connecting member 211. Therefore, when the slider cooperates with the chute, when the second driving member 210 drives the second connecting member 211, the second connecting member 211 can move back and forth; when the second connecting member 211 is movably connected to the third connecting member 212, it may also be that the middle part of the upper portion of the second connecting member 211 is concave, and connecting arms are formed on both sides. Through holes are provided at the same height of the connecting arms on both sides. At the same time, through holes are also provided on the third connecting member 212. The second connecting member 211 and the third connecting member 212 are rotatably connected to each other through a rotating shaft passing through the through holes of the two, and the second connecting member 211 is rotatably connected to the third connecting member 212 through the rotating shaft. Since the second driving member 210 is fixedly connected to the second connecting member 211, when the second driving member 210 drives the second connecting member 211 to move, the second connecting member 211 can swing slightly in the horizontal direction through the rotating shaft. It can be understood that in the manner of realizing the back-and-forth swing of the second connecting member 211, when the second connecting member 211 is connected to the third connecting member 212, it may also be that the upper portion of the second connecting member 211 protrudes, and the corresponding position of the third connecting member 212 is concave. Through holes are provided at the protruding position, and corresponding holes are provided on both side surfaces at the concave position. When the two are connected, the protruding and concave portions can be matched, and then the rotating shaft is inserted into the through hole to realize the connection between the protruding and concave portions. The present application does not specifically limit the manner of movably connecting the third connecting member 212 and the second connecting member 211, as long as it can be ensured that when the second driving member 210 drives the second connecting member 211, the second connecting member 211 can move back and forth in the horizontal direction. It can be understood that during the laser welding of the battery cell tab 7, the welding track is usually not too long. Therefore, the position range of the rolling member 10 rolling back and forth is relatively small. The second connecting member 211 and the third connecting member 212 can be slidably connected, or the second connecting member 211 can move back and forth relative to the third connecting member 212 through the connection of the rotating shaft. However, in the actual process of the rolling member 10 rolling the battery cell tab 7, the swinging manner can better ensure the stability of the entire structure than the sliding manner. Therefore, the present application preferably adopts any of the above swinging manners to realize the movable connection between the second connecting member and the third connecting member 212.

[0063] Further, the third connecting member 212 is provided with at least one second mounting hole 2120 corresponding to the top of the first connecting member 11, and a second buffer 4 is installed in the second mounting hole 2120, and the second buffer 4 is movably abutted against the top of the first connecting member 11.

[0064] In the above embodiments, the second buffer 4 has the same functions and effects as the first buffer 3 described above, and will not be elaborated here. It should be noted that the second buffer 4 in the embodiments of the present application is disposed in the second mounting hole 2120 of the third connecting member 212. When the second connecting member 211 swings relative to the third connecting member 212 in a swinging manner, since the second buffer 4 is in active contact with the first connecting member 11, when the second driving member 210 drives the second connecting member 211 to swing, when the second connecting member 211 abuts against the second buffer 4, the second buffer 4 slows down the continuous swinging of the second connecting member 211, and functions to limit the swinging amplitude of the second connecting member 211 in the horizontal direction, so that the entire pressing assembly 1 is in a stable state when rolling the electrode tab 7 of the battery cell, which is beneficial to improving the stability of the entire pressing device.

[0065] Please refer to Figures 1 to 9 , in an embodiment, the pressing assembly 1 further includes a pressing member 12, the pressing member 12 is detachably connected to the first connecting member 11, and the rolling member 10 is disposed at the bottom end of the pressing member 12.

[0066] In this embodiment, the pressing assembly 1 includes a first connecting member 11 and a pressing member 12. The first connecting member 11 is detachably connected to the pressing member 12, which is beneficial to the replacement and maintenance of the pressing member 12.

[0067] It should be noted that in the actual production process, the production lines of battery modules and / or battery packs are usually continuously produced in batches without interruption. In the laser welding process, the pressing device of the electrode tab 7 of the battery cell frequently operates every day and is prone to damage during the process of rolling the electrode tab 7 of the battery cell multiple times, and it belongs to a vulnerable part. In the embodiments of the present application, the pressing assembly 1 is divided into a pressing member 12 and a first connecting member 11, and the first connecting member 11 is detachably connected to the pressing member 12, which is convenient for disassembly. From the above content, the first connecting member 11 is used for active connection with the second connecting member 211, and it is not convenient for disassembly and maintenance after connection. Therefore, the pressing assembly 1 is divided into a pressing member 12 and a first connecting member 11, and the rolling member 10 is disposed at the bottom end of the pressing member 12 to ensure the rolling function of the electrode tab 7 of the battery cell.

[0068] Exemplarily, in the above embodiment, the present application can be provided with a chute or a slider at the upper end of the pressing member 12, and a slider or a chute is correspondingly provided at the lower end of the first connecting member 11. The first connecting member 11 and the second connecting member 211 can be quickly positioned and connected preliminarily through the chute and the slider, and then the first connecting member 11 and the second connecting member 211 can be fixed by bolts to achieve quick disassembly and assembly of the two. Further, the chute or the slider provided on the first connecting member 11 and the slider or the chute provided on the pressing member 12 are inclined. When inclined, when the pressing member 12 is installed or disassembled, the chute and the slider are in a clamping state, and the inclined surface can provide a certain supporting effect, which is more conducive to the disassembly of the first connecting member 11 and the pressing member 12.

[0069] In the above embodiment, the present application can adopt the way of mutual clamping between the slider and the chute, and the disassembly and assembly of the first connecting member 11 and the pressing member 12 become very simple and fast. Since a reliable connection relationship is established between the first connecting member 11 and the pressing member 12, when it is necessary to replace or maintain the pressing member 12, only the chute and the slider need to be separated, and there is no need to use complex tools for cumbersome operations. When it is necessary to adjust the pressing member 12 or replace the pressing member 12 of different specifications, only the corresponding pressing member 12 needs to be replaced to achieve this, and there is no need to make large-scale modifications to the entire pressing assembly 1, which simplifies the assembly and disassembly process.

[0070] Please refer to Figures 1 to 9 , in an embodiment, the pressing assembly 1 further includes a dust suction member 13, and the dust suction member 13 is detachably connected to the pressing member 12. The pressing member 12 is provided with a support arm 120, and the support arm 12 is rotatably connected to the rolling member 10.

[0071] In this embodiment, the dust suction member 13 is used to collect foreign matters such as soot, welding slag, and spatter generated during the laser welding process.

[0072] It should be noted that in the welding process of the battery cell tab 7, since the composition between the battery cell tab 7 and the bus bar 6 materials is not uniform and contains more impurities or low-melting-point substances, it is easy to melt and form welding slag during the welding process. In addition, the surfaces of the battery cell tab 7 and the bus bar 6 are not cleaned properly and are affected by welding parameters, which easily forms welding slag during welding. Welding slag and smoke are easy to fall into the molten pool during laser welding, thereby affecting the welding quality. For example, if smoke and spatter are not removed in time, they are easy to adhere to the surface of the tab or the clamping piece 12 during laser welding, and are easy to fall into the molten pool during welding, resulting in defects such as blown welds and white holes during welding. In the prior art, a dust suction port is usually opened on the side wall of a square or round copper nozzle, and spatters or welding slag are directly sucked in through the dust suction port on the side wall. However, in actual use, it is usually necessary to clean the dust suction port of the copper nozzle at regular intervals. Since the size of the copper nozzle is small and the dust suction port is arranged on the inner wall of the copper nozzle, the welding slag retained in the dust suction port is very difficult to clean.

[0073] Exemplarily, in order to solve the problem that the dust collecting member 13 is difficult to clean, the bottom of the clamping member 12 of the present application is provided with a support arm 120 structure, and the rolling member 10 may be a roller, which is arranged on the support arm 120, wherein the support arm 120 is used to connect the clamping member 12 and the rolling member 10 and transmit power to the rolling member 10, so as to realize the function that the rolling member 10 can roll the battery cell tab 7. Since the support arm 120 is connected to the roller, the dust collecting member 13 and the clamping member 12 can be connected through the support arm 120. When the dust collecting member 13 is connected to the clamping member 12 through the support arm 120, the rolling member 10 and the dust collecting member 13 are arranged close to each other, which is conducive to sucking away welding slag, smoke and other foreign matter when the clamping member 12 rolls the battery cell tab. Specifically, the dust collecting member 13 and the support arm 120 can be connected by bolts with screw holes or nuts.

[0074] For further information, see Figures 1 to 9 In one embodiment, the support arms 120 are respectively arranged at the two ends of the bottom of the clamping member, and the two ends of the rolling member 10 are respectively rotatably connected to the two support arms 120. The support arms 120 at both ends and the main body of the clamping member 12 and the rolling member 10 between the support arms 120 form an opening 121. The dust suction member 13 is provided with a dust suction port 131, and the dust suction port 131 and the opening 121 are relatively fitted.

[0075] In this embodiment, support arms 120 are respectively provided at both ends of the bottom of the pressing member 12. In addition to being able to connect the pressing member 12 and the rolling member 10 and transmit power to the rolling member 10, the support arms 120 at both ends are also used to mount the dust suction member 13. Specifically, the dust suction member 13 is provided with a dust suction cavity. One end of the dust suction cavity is provided with a dust suction port 131. Both ends of the rolling member are rotatably connected to the two support arms 120 respectively. The support arms 120, the main body of the pressing member 12 and the rolling member 10 together form an opening 121. The dust suction port 131 and the opening 121 are arranged opposite to each other and are in contact with each other. A dust suction pipe is provided on the other side of the dust suction member 13 away from the opening 121. By connecting to an external vacuum cleaner through the dust suction pipe, welding slag and fumes can be collected at the position of the dust suction port 131 of the dust suction member 13. And because the dust suction port 131 is arranged on the support arm 120 and is arranged opposite to and in contact with the opening 121, the support arm 120 can also be regarded as the side wall of the dust suction cavity as a whole. When the dust suction member 13 starts to work, foreign matters such as welding slag and fumes are more likely to enter the dust suction cavity through the opening 121 and the dust suction port 131. At the same time, when cleaning the dust suction member 13, only need to disassemble the dust suction member 13 from the pressing member 12 to clean the dust suction member 13 alone, which is convenient for cleaning and maintenance of the pressing member 12 and the dust suction member 13.

[0076] In the above embodiment, by setting the dust suction member 13, during the laser welding process, in cooperation with the pressing member 12, welding slag, fumes and other splashes can be sucked into the dust suction member 13, and then the collected welding slag and fumes are discharged from the dust suction member 13 through the dust suction interface. When the dust suction member 13 is working, the dust suction port 131 is closely attached to the pressing member 12. As the welding progresses, a vacuum device such as a vacuum cleaner is connected to the dust suction pipe of the dust suction member 13 to discharge the air in the dust suction member 13, forming a negative pressure. Under the action of the negative pressure, the welding slag and splashes generated in the welding area are sucked into the dust suction member 13 and are transported to the vacuum device through the dust suction pipeline. The whole dust suction process is continuous and efficient, ensuring the cleanliness of the welding area and the stability of the welding quality.

[0077] It can be understood that the present application does not make specific restrictions on the support arm 120, as long as it can be rotatably connected to the rolling member 10 to realize the rolling of the rolling member. Exemplarily, the support arm 120 of the present application can also be a structure separately provided in the middle of the bottom of the pressing member 12, that is, one end of the support arm 120 is integrally and / or detachably connected to the pressing member 12, and the other end of the support arm 120 is provided with a bending structure, and the end of the bending structure is connected to the rolling member 10 through a rolling shaft, which can also achieve the purpose of rolling the electrode tab 7 of the battery core by the rolling member 10. It should be noted that when the support arm 120 is connected to the dust suction member 13 in this setting manner of the support arm 120, the support arm 120 will block a part of the dust suction port 131, and rely entirely on the dust suction port 131 of the dust suction member 13 to suck welding slag, fumes, etc. into the dust suction cavity, and the actual dust suction effect is relatively poor. Therefore, the present application preferably adopts the setting manner of providing support arms 120 at both ends of the bottom of the pressing member 12.

[0078] Furthermore, a slope 130 is provided at the bottom of the dust suction member 13, and a cleaning member 14 is mounted on the slope 130. The cleaning member 14 is disposed opposite to the rolling member 10 to clean the surface of the rolling member 10.

[0079] In the above embodiment, a slope 130 is provided at the bottom of the dust suction member 13. The slope 130 is used to guide the fumes and welding slag generated during the laser welding process to concentrate towards the dust suction pipe, and the slope 130 can also effectively prevent the fumes and welding slag from accumulating in the dust suction cavity of the dust suction member 13. In the absence of the slope 130, these impurities may remain at the bottom of the dust suction member 13 and are difficult to be completely removed, while the design of the slope 130 facilitates the suction device to suck in the welding slag. At the same time, a cleaning member 14 is also provided on the slope 130, and the cleaning member 14 is disposed opposite to the rolling member 10 to clean the surface of the rolling member 10. The cleaning member 14 can be a scraper or a brush. The present application does not specifically limit the type of the cleaning member 14, as long as it can clean the rolling member 10. Preferably, the cleaning member 14 of the present application is a scraper. Exemplarily, the scraper is disposed on the slope 130, and its sharp edge can be disposed opposite to the rolling member 10, such as a roller shaft. When the roller shaft rolls, the scraper can scrape off the stubborn fumes and other residues attached to the surface of the roller shaft. By providing the cleaning member 14, not only can it ensure that the rolling member 10 is flat, but also it can reduce the quality problem of poor welding of the battery core tab 7 caused by incomplete cleaning.

[0080] Please refer to Figures 1 to 9 , in an embodiment, the first driving mechanism 20 includes a first driving member 200 and a fixed seat 201. The first driving member 200 is slidably connected to the fixed seat 201; the fixed seat 201 is slidably connected to the third connecting member 212 through a sliding column 5, and the first driving member 200 is fixedly connected to the third connecting member 212.

[0081] In this embodiment, from the above content, it can be known that the first driving mechanism 20 is connected to the second driving mechanism 21. Therefore, the first driving member 200 provides the power for the pressing assembly 1 to move in the vertical direction to drive the pressing assembly 1 to move back and forth in the vertical direction. The fixed seat 201 is used to connect the first driving mechanism 20 and the third connecting member 212, and can also be connected to other external devices to achieve movement or positioning in other directions.

[0082] In the above embodiments, by way of example, the first driving member 200 and the fixed seat 201 can be slidably connected through a slide rail and a slide groove. Specifically, this can be achieved by providing a slide rail on the fixed seat 201 and a slide groove on the first driving member 200. Further, the fixed seat 201 can be slidably connected to the third connecting member 212 through a sliding column 5, and the first driving member 200 is fixedly connected to the third connecting member 212. When the first driving member 200 drives the third connecting member 212 to move in the vertical direction, the third connecting member 212 and the fixed seat 201 can be displaced relative to each other in the vertical direction, thereby realizing the function of driving the pressing assembly 1 to press the electrode tab 7 of the battery cell in the vertical direction. The specific type of the first driving member 200 in this application is not specifically limited. Similar to the second driving member 210, it can be designed according to actual needs and can be a motor, a cylinder, a hydraulic cylinder, etc.

[0083] Further, the first driving mechanism 20 may further include a mounting block for connecting to the third connecting member 212. Specifically, when the first driving mechanism 20 is connected to the third connecting member 212, the first driving member 200 is fixedly connected to the mounting block, and the fixed seat 201 and the mounting block are slidably connected through a sliding column 5. When the first driving member 200 moves, it can drive the mounting block to move relative to the fixed seat 201, and then the mounting block and the third connecting member 212 are fixedly connected by bolts. Since the mounting block is introduced into the first driving mechanism 20, when the first driving mechanism 20 and the second driving mechanism 21 are connected in the vertical direction, they only need to be fixedly connected together through the mounting member and the third connecting member 212, which is convenient for the overall disassembly, assembly and replacement of individual components.

[0084] Please refer to Figures 1 to 9 , in one embodiment, the present application further provides a laser welding pressing system for battery cell electrode tabs, including two of the above-mentioned laser welding pressing devices for battery cell electrode tabs, and the two pressing devices are arranged opposite to each other.

[0085] It should be noted that in actual production, the stability of the cell tab 7 needs to be maintained during the welding process. In the prior art, a square or round annular copper nozzle is usually used to press down the cell tab 7. When the square or round copper nozzle presses down the cell tab 7, there are multiple pressing points on the four sides of the square or the side of the circle, which can fix the welding area of the cell tab 7 to ensure the stability of the welding process between the cell tab 7 and the bus 6. The cell tab laser welding clamping device 9 provided in the present application can be rolled from one end of the cell tab 7 to the other end when used alone. After rolling and flattening, it can only press down one end of the cell tab, which is easily affected by external factors, such as collision, wind speed, etc., causing the cell tab 7 to deviate or the other end to easily warp or wrinkle again. In order to prevent the battery cell tab 7 from being offset during the laser welding process or the other end that is not pressed from being easily lifted or wrinkled again, the present application also provides a battery cell tab laser welding clamping system, in which the clamping devices 9 are arranged in pairs. When the battery cell tab 7 is laser welded, the two ends of the battery cell tab 7 can be clamped. When the battery cell tab 7 is flattened, the two clamping devices 9 can flatten the battery cell tab 7 at the same time, thereby improving the flattening efficiency of the battery cell tab 7.

[0086] In the above embodiment, the present application does not impose any specific restrictions on the shape of the cell tab 7 and the busbar 6 before welding, as long as the welding portion of the cell tab 7 and the busbar 6 is flat. For example, the cell tab 7 can be a bent tab, that is, a portion of the cell tab 7 after bending is used for welding with the busbar 6, such as Figure 8 and Figure 9 As shown; the battery cell tab 7 can also be an unbent sheet structure, a part of which is used to connect with the bus 6; at the same time, the bus 6 can be determined according to the specific battery cell stack structure, such as a "匚"-shaped structure, the upper and lower horizontal surfaces of which can be used for welding with the battery cell tab 7, or a "I"-shaped structure, the upper and lower surfaces or the opposite ends of the same surface can be used for welding with the battery cell tab 7.

[0087] Specifically, two clamping devices 9 are respectively arranged on both sides of the galvanometer lens 8 of the laser welding equipment, and are symmetrically arranged relative to the galvanometer lens. During welding, the galvanometer lens 8 is parallel to the two rolling elements 10 to weld the battery cell tabs 7, which can avoid accidental damage to the clamping device 9 by the laser. It can be understood that during laser welding of the battery cell tabs 7, the two ends of the battery cell tabs 7 can be clamped, that is, the two opposite ends of the battery cell tabs 7 used for welding with the bus 6 can be arranged along the length direction of the battery cell tabs 7, or can be arranged along the width direction of the battery cell tabs 7, or can be arranged along the diagonal direction of the welding area. This application does not make specific restrictions, and can be arranged according to the specific structure of the battery cell tabs 7 and the bus 6, as long as the battery cell tabs 7 remain stable during the welding process.

[0088] In the above embodiments, the laser welding and pressing system for the battery cell tab of the present application uses a PLC program to automatically control the pressing device 9. Exemplarily, when the PLC program controls the pressing device 9 to roll press the battery cell tab 7, one of the pressing devices 9 can press the battery cell tab 7, and the other pressing device 9 can roll press the battery cell tab 7, or both pressing devices 9 can roll press the battery cell tab 7 simultaneously. The present application preferably uses both pressing devices 9 to roll press the battery cell tab 7 simultaneously, which helps to reduce the operation time of the process, improve the processing efficiency, and reduce the processing cost. Further, when the present application uses both pressing devices 9 to roll press the battery cell tab 7 simultaneously, in order to avoid wrinkles caused by relative extrusion during the rolling process, when rolling, the two pressing devices 9 first approach each other to a distance of 0 - 0.5 mm, then simultaneously descend to contact and press the middle of the area to be welded of the battery cell tab 7 and the bus bar 6, and finally, under the control of the PLC program, the two pressing devices 9 roll press the battery cell tab 7 from the middle outwards in a direction away from each other. Even further, in order to avoid collision when the two pressing devices 9 approach each other, the stroke of both can be controlled by the PLC program, and when the two pressing devices 9 are installed, the maximum amplitude of the swing can be limited by the second buffer 4, thereby limiting the stroke of the two pressing devices 9 to ensure a safe distance of 0 - 0.5 mm when the two pressing devices 9 approach each other.

[0089] Please refer to Figures 1 to 9 , in actual use, the operation process of the laser welding and pressing system for the battery cell tab is as follows:

[0090] As Figure 9 shown, at the laser welding station of the battery cell tab 7 and the bus bar 6, a laser welding machine and a pressing system are provided. The pressing system is provided with a pair of pressing devices 9 for rolling the opposite ends of the welding position of the battery cell tab 7 and the bus bar 6. The vibration lens 8 of the laser welding machine is used to emit laser to weld the welding position of the battery cell tab 7 and the bus bar 6.

[0091] Initial state: Before the second driving member 210 in the two pressing devices 9 is started, it is in the initial position in the horizontal direction. At this time, the second driving members 210 in the pressing devices on both sides are farthest apart at the horizontal end, and the first driving member 200 is in the initial position at the top in the vertical direction. At this time, the rolling members 10 in the pressing assemblies 1 on both sides are at the same height and in a parallel state.

[0092] Rolling state: Under the control of the PLC program, the second driving parts 210 of the two pressing devices 9 are simultaneously started, driving the two pressing components to swing in the direction of approaching each other. When the two pressing components reach the maximum swing limit stroke of the second buffer 4, the distance between the two pressing components is 0 - 0.5 mm. At this time, the second driving parts of the two pressing devices 9 stop operating, maintaining this device state and the rolling part 10 is located in the middle of the area where the cell tab 7 and the busbar 6 are to be welded. As Figure 8 shown, then under the control of the PLC program, the first driving mechanism 20 is controlled, and the first driving part 200 drives the second driving mechanism 21 to move downward, thereby driving the pressing component 1 to move downward until the rolling part 10 presses the cell tab 7. During the process of pressing the cell tab 7, the first buffer 3 automatically balances the rolling part 10 to be in a balanced state, ensuring that the rolling part 10 is in contact with the cell tab 7. Then the PLC program controls the second driving parts 210 of the two pressing devices 9 to start driving the second connecting parts 211 to swing around the rotating shaft, moving outward from the middle in the direction of moving away from each other, thereby realizing the rolling of the rolling part 10 on the cell tab 7. During the swinging process, the second buffer 4 limits the swinging angle and speed to prevent the second connecting block from getting out of control and jamming under the drive of the second driving part 210.

[0093] Dust suction state: During the process that the rolling parts 10 of the two pressing devices 9 roll the cell tab 7 outward from the middle in the direction of moving away from each other under the control of the PLC program, the PLC program controls the dust suction part 13 to be turned on in advance. The cleaning part 14 cleans the rolling parts 10, and inhales foreign matters through the dust suction part 13 and discharges them into the vacuum cleaner.

[0094] Welding process: Under the control of the PLC program, the vibrating lens 8 moves between the two pressing devices and performs laser welding along the direction parallel to the rolling part 10 according to the preset welding trajectory. After the welding is completed, the PLC program controls the dust suction part 13 to be turned off.

[0095] Reset state: After the welding is completed, the PLC program controls the vibrating lens 8 to reset, and simultaneously controls the first driving part 200 to drive the second driving mechanism 21 to move upward, returning to the initial position at the top in the vertical direction, waiting for the next cell tab 7 and busbar 6 to be welded.

[0096] In summary, a laser welding pressing device for a battery cell tab according to an embodiment of the present application includes a driving assembly 2 and a pressing assembly 1. The driving assembly 2 includes a first driving mechanism 20 and a second driving mechanism 21. A rolling member 10 is provided at the bottom end of the pressing assembly 1. The second driving mechanism 21 is connected to the pressing assembly 1 to drive the pressing assembly 1 to roll in the horizontal direction. The first driving mechanism 20 and the second driving mechanism 21 are connected to drive the pressing assembly 1 to press up and down in the vertical direction. In this technical solution, a rolling member 10 is provided at the bottom end of the pressing assembly 1, and the second driving mechanism 21 is connected to the pressing assembly 1 so that when the second driving mechanism 21 acts, it can drive the pressing assembly 1 to move back and forth in the horizontal direction. Moreover, the first driving mechanism 20 is connected to the second driving mechanism 21 so that when the first driving mechanism 20 acts, it can drive the second driving mechanism 21 to move back and forth in the vertical direction. Since the second driving mechanism 21 is connected to the pressing assembly 1, when the second driving mechanism 21 moves back and forth, it can drive the pressing assembly 1 to move back and forth in the vertical direction, so as to realize that the pressing assembly 1 presses the battery cell tab 7 in the vertical direction. Under the combined action of the first driving mechanism 20 and the second driving mechanism 21, before laser welding of the battery cell tab 7, the pressing assembly 1 rolls the battery cell tab 7 to flatten the wrinkles of the battery cell tab 7. It can effectively solve the technical problem that the battery cell tab 7 of a soft-pack battery cell is uneven in the laser welding process in the prior art, thereby affecting the safety and service life of the battery pack.

[0097] Compared with the prior art, a laser welding pressing system for a battery cell tab according to an embodiment of the present application includes two of the above-mentioned laser welding pressing devices for battery cell tabs, and the two pressing devices are arranged oppositely. It can be understood that the laser welding pressing system for a battery cell tab of the present application may include all the technical features and technical effects of the above-mentioned pressing device, which will not be elaborated here.

[0098] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A laser welding and pressing device for the tab of an electrode core, characterized in that, Comprising: A driving assembly and a pressing assembly. The driving assembly includes a first driving mechanism and a second driving mechanism. A rolling member is provided at the bottom end of the pressing assembly. The second driving mechanism is connected to the pressing assembly to drive the pressing assembly to roll in the horizontal direction; the first driving mechanism and the second driving mechanism are connected to drive the pressing assembly to press up and down in the vertical direction.

2. The laser welding and pressing device for the electrode tab of the battery cell according to claim 1, wherein The pressing assembly includes a first connecting member. The second driving mechanism includes a second driving member and a second connecting member. The second connecting member is rotatably connected to the first connecting member. The second driving member is fixedly connected to the second connecting member to drive the first connecting member to move in the horizontal direction.

3. The laser welding and pressing device for the electrode tab of the battery cell according to claim 2, wherein, The first connecting member is provided with at least one first mounting hole corresponding to the bottom of the second connecting member. A first buffer is installed in the first mounting hole. The first buffer is in movable abutment with the bottom of the second connecting member.

4. The laser welding and pressing device for the electrode tab of the battery cell according to claim 2, wherein, The second driving mechanism further includes a third connecting member. The third connecting member is fixedly connected to the second driving member. The third connecting member is movably connected to the second connecting member.

5. The electrode tab laser welding and pressing device for the battery cell according to claim 4, wherein, The third connecting member is provided with at least one second mounting hole corresponding to the top of the first connecting member. A second buffer is installed in the second mounting hole. The second buffer is in movable abutment with the top of the first connecting member.

6. The laser welding and pressing device for the electrode tab of the battery cell according to claim 2, wherein The pressing assembly further includes a pressing member. The pressing member is detachably connected to the first connecting member. The rolling member is provided at the bottom end of the pressing member.

7. The laser welding and pressing device for the electrode tab of the battery cell according to claim 6, wherein The pressing assembly further includes a dust suction member. The dust suction member is detachably connected to the pressing member.

8. The laser welding and pressing device for the tab of the battery cell according to claim 7, wherein, The bottom of the dust suction member is provided with an inclined surface. A cleaning member is installed on the inclined surface. The cleaning member is arranged opposite to the rolling member to clean the surface of the rolling member.

9. The laser welding and pressing device for the electrode tab of the battery cell according to claim 7, wherein, The pressing member is provided with a support arm. The support arm is rotatably connected to the rolling member.

10. The laser welding and pressing device for the electrode tab of the battery cell according to claim 9, wherein, The support arms are respectively arranged at both ends of the bottom of the pressing member. Both ends of the rolling member are respectively rotatably connected to the two support arms. The support arm, the main body of the pressing member and the rolling member together form an opening. The dust suction member is provided with a dust suction port. The dust suction port and the opening are arranged opposite to each other and are in contact with each other.

11. The laser welding and pressing device for the electrode tab of the battery cell according to claim 4, wherein The first driving mechanism includes a first driving member and a fixed seat. The first driving member is slidably connected to the fixed seat; the fixed seat is fixedly connected to the third connecting member through a sliding column. The first driving member is slidably connected to the third connecting member.

12. A laser welding and pressing system for the tab of an electrode core, characterized in that, Including two cell tab laser welding pressing devices according to any one of claims 1 to 11. The two pressing devices are arranged opposite to each other.

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