A squeegee

Abstract

The utility model relates to battery manufacturing technical field discloses a kind of patting machine, comprising: battery cell bracket, for receiving and conveying battery cell;Lower pressing component, set in the top of the battery cell bracket, for compacting and fixing the battery cell on the battery cell bracket;And patting component, set in at least one side of the battery cell bracket, the patting component includes the multiple groups of patting head arranged along battery cell conveying path, multiple groups of the patting head are all driven by patting drive part, for the tab of the battery cell end surface on the battery cell bracket sequentially carries out patting operation;Wherein, the patting head is equipped with profiling block, and the profiling block between multiple groups of the patting head has mutually different patting angle.The utility model carries out patting operation by multiple groups of patting head, and the multi-angle patting of battery cell tab can be realized.

Description

Technical Field

[0001] This utility model belongs to the field of battery manufacturing technology, specifically relating to a flattening machine. Background Technology

[0002] In the manufacturing process of batteries and other rechargeable batteries, the battery cell is the core component, which is usually formed by winding or stacking positive electrode plates, negative electrode plates, and separators. On both sides of the battery cell, positive and negative tabs are led out for connection. The tabs need to be bent towards the center of the battery cell end face until the tabs are completely attached to the battery cell end face. This process is called tab flattening.

[0003] Existing flattening mechanisms often have a fixed flattening angle, which makes it difficult to adapt to the process requirements of different cell specifications for the tab forming angle. Furthermore, the tab shape after flattening is inconsistent, resulting in a high defect rate for the produced cells. Utility Model Content

[0004] To address the shortcomings of the prior art, this utility model provides a flattening machine that performs flattening operations using multiple sets of flattening heads, enabling multi-angle flattening of the battery cell tabs.

[0005] The technical effects to be achieved by this utility model are realized through the following aspects: This utility model provides a flattening machine, comprising: Cell support brackets are used to support and transport battery cells; A pressing assembly, disposed above the cell holder, is used to press and fix the cell located on the cell holder; and A flattening assembly is disposed on at least one side of the cell tray. The flattening assembly includes multiple sets of flattening heads arranged along the cell conveying path. The multiple sets of flattening heads are driven by a flattening drive component and are used to perform flattening operations on the tabs of the cell end face on the cell tray in sequence. The flat-head is equipped with contour blocks, and the contour blocks of the multiple sets of flat-heads have different flat-heading angles.

[0006] In some implementations, a flattening groove is provided on the end face of the contour block facing the tab. The flattening groove includes a first limiting surface for centering the battery cell and a second limiting surface for flattening the battery cell tab. The first limiting surface and the second limiting surface are coaxially arranged from the outside to the inside along the radial direction of the flattening groove.

[0007] In some implementations, the flattening groove further includes a third limiting surface for preventing the tab from flipping over, the third limiting surface being located between the first limiting surface and the second limiting surface.

[0008] In some implementations, on the cross-section of the contour block, the included angle α between the two sides of the first limiting surface is not equal to the included angle β between the two sides of the second limiting surface; Multiple sets of flattening heads are arranged along the cell conveying path, and the included angle β of the flattening grooves increases sequentially.

[0009] In some implementations, the included angle β is greater than or equal to 100° and less than or equal to 180°.

[0010] In some implementations, the flattening assembly further includes a fixed plate, a linear guide rail, and a ball screw. The fixed plate is mounted on the linear guide rail. One side of the fixed plate is rotatably connected to the ball screw via a bearing. Multiple sets of flattening heads are mounted on the other side of the fixed plate. The driving end of the flattening drive is connected to one end of the ball screw.

[0011] In some implementations, the pressing assembly includes a pressing cylinder and a positioning member driven by the pressing cylinder, the movement direction of the positioning member being perpendicular to the flattening direction of the flattening head, for laterally pressing and constraining the battery cell.

[0012] In some implementations, the end of the positioning element that contacts the sidewall of the battery cell is arc-shaped.

[0013] In some implementations, the contour block is detachably connected to the flattening head.

[0014] In some implementations, the flattening assembly further includes a horizontal adjustment knob and a vertical adjustment knob for adjusting the position of the multiple sets of flattening heads.

[0015] In summary, this utility model has at least the following advantages: This utility model provides a flattening machine that adopts a structural design in which the pressing component and the flattening component work together. By setting up multiple sets of flattening heads that work in sequence, and setting up detachable contour blocks on the flattening heads, the flattening angle between the contour blocks of each set of flattening heads is different. By flattening the same cell in sequence, the gradual flattening of the cell tabs can be achieved, which improves the overall flatness and angular accuracy of the cell tabs after flattening. It can effectively avoid problems such as local bulges, bending edges and warping of the tabs, and ensure the consistency of the shape of the cell tabs after flattening, thus meeting the requirements of cell assembly and subsequent use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the flattening machine provided in an embodiment of the present utility model.

[0017] Figure 2 Another structural schematic diagram of the flattening machine provided in this embodiment of the utility model.

[0018] Figure 3 This is a partially enlarged schematic diagram of the flattening machine provided in an embodiment of the present utility model.

[0019] Figure 4 This is a schematic diagram of the structure of the contour block provided in an embodiment of the present utility model.

[0020] Figure 5 Another structural schematic diagram of the contour block provided in this embodiment of the utility model.

[0021] Marked in the image: 1. Battery cell bracket; 2. Pressing assembly; 21. Pressing cylinder; 22. Positioning component; 3. Flattening assembly; 31. Flattening drive component; 311. First servo motor; 312. Second servo motor; 32. Flattening head; 33. Horizontal adjustment knob; 34. Vertical adjustment knob; 35. Fixing plate; 36. Linear guide rail; 4. Contouring block; 41. Flattening groove; 411. First limiting surface; 412. Second limiting surface; 413. Third limiting surface; 5. Battery cell; 6. Auxiliary components. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] Example 1: Please see Figure 1 , Figure 1 The structure of a flattening machine according to this utility model is shown. The flattening machine includes: a cell support 1 for receiving and conveying cell 5; a pressing component 2 disposed above the cell support 1 for pressing and fixing the cell 5 located on the cell support 1; and a flattening component 3 disposed on at least one side of the cell support 1. The flattening component 3 includes multiple sets of flattening heads 32 arranged along the conveying path of the cell 5. The multiple sets of flattening heads 32 are all driven by a flattening drive component 31 and are used to sequentially flatten the tabs on the end face of the cell 5 on the cell support 1. The flattening head 32 includes a contour block 4, and the contour blocks 4 of the multiple sets of flattening heads 32 have different flattening angles.

[0025] Specifically, the flattening machine includes a cell support 1, a pressing assembly 2, and a flattening assembly 3. The cell support 1 is used to receive and transport the cell 5. Its bearing surface can be provided with a positioning groove adapted to the shape of the cell 5. When the cell 5 moves to the positioning groove, the cell 5 is initially positioned so that the pressing assembly 2 can then position and secure the cell 5 in the positioning groove. To further achieve automated operation, the cell support 1 is also provided with a transport device for transporting the cell 5. This transport device can be, but is not limited to, a linear module driven by a servo motor, a jump plate, a slide table, or a synchronous belt conveyor, etc., to transport the cell 5 sequentially to different positioning grooves so that the flattening assembly 3 can perform flattening operations on the cell 5 sequentially.

[0026] The flattening component 3 is located on the side of the cell bracket 1 and is close to the pressing component 2. The pressing component 2 performs a pressing action in the vertical direction, while the flattening component 3 performs a flattening action in the horizontal direction. The flattening component 3 sequentially steps multiple sets of flattening heads 32 along the processing path of the cell 5. Each set of flattening heads 32 corresponds one-to-one with the positioning groove on the cell bracket 1, so that the tabs of the cell 5 located in the positioning groove can sequentially correspond to each set of flattening heads 32.

[0027] It is worth noting that the flattening head 3 is equipped with a contour block 4, which is used to press and flatten the tabs of the battery cell 5. Different contour blocks 4 with different flattening angles can be selected on different flattening heads 3 according to the actual production specifications of the battery cell 5, performing the flattening operation sequentially to achieve a gradual flattening effect. This contour block 4 is a detachable and replaceable structure, allowing for quick replacement according to the battery cell 5 model, and facilitating maintenance and upkeep.

[0028] In some embodiments, the flattening heads 32 are in three groups, each performing flattening operations on the five tabs of the battery cell at different angles. Each group of flattening heads 32 can be independently configured to drive the flattening drive unit 31, or a single flattening drive unit 31 can be used to perform the flattening operation synchronously. The flattening drive unit 31 can be a servo motor, stepper motor, or hydraulic cylinder, or other components that can provide precise linear drive, depending on the actual situation.

[0029] Understandably, when the five tabs of the battery cell are flattened, the operation mode of the flattening machine can be configured according to the actual situation. Parameters such as the frequency of the flattening reciprocating motion, the duration of the flattening and pressing, and the pressure applied during flattening can be preset. This flattening machine can be installed as an independent module on an external frame and integrated into the automated production line of battery manufacturing, working collaboratively with other battery manufacturing equipment. This application does not limit its scope in this regard.

[0030] In another embodiment, the flattening drive 31 of the flattening assembly 3 includes a first servo motor 311 and a second servo motor 312. The first servo motor 311 and the second servo motor 312 are arranged opposite each other and are respectively installed on both sides of the cell bracket 1 to jointly flatten the cell 5. The drive end of the first servo motor 311 is provided with a flattening head 32, which acts on the tab end of the cell 5, while the drive end of the second servo motor 312 is provided with an auxiliary component 6, which acts on the other end of the cell 5 to provide relative force. The two servo motors cooperate to achieve synchronous flattening. Under the coordination of the control system, the two servo motors move synchronously and with the same parameters towards each other, so that they can act on both ends of the cell 5 simultaneously and with equal force. The drive of the two servo motors can greatly reduce the displacement and vibration of the cell 5 caused by the flattening force during the flattening process, ensuring the positioning stability of the cell 5 on the cell bracket 1.

[0031] In this embodiment, the battery cell 5 is transferred to the battery cell holder 1 by an external mechanism. The battery cell 5 is then transported step by step by a transport device, delivering it to the positioning slot directly below the pressing assembly 2. The transport device stops, and the pressing assembly 2 starts, pressing down and fixing the battery cell 5 in the positioning slot. While descending and pressing, a certain pressure is maintained to achieve a stable fixation of the battery cell 5 and prevent displacement during the flattening process. When the pressing assembly 2 presses down, the flattening assembly 3 is driven by the flattening drive 31 to drive the flattening head 32, causing the flattening head 32 to flatten vertically towards the electrode tab of the battery cell 5. After the battery cell 5 is flattened at the first angle, the flattening assembly 3 retracts, and then the pressing assembly 2 releases the battery cell 5. The transport device then moves the battery cell 5 to the next positioning slot so that the battery cell 5 can perform a second angle flattening action. The flattening machine sets up multiple flattening heads 32 at different angles along the processing path of the battery cell 5 to achieve flattening of the battery cell 5 tabs from multiple angles. This effectively eliminates foundation deformation and avoids tilting and warping phenomena that occur when flattening at a single angle, ensuring the consistency of the shape of the battery cell 5 tabs after flattening and meeting the requirements for battery cell 5 assembly and subsequent use.

[0032] Example 2: This embodiment is a further structural optimization of the flattening machine of this utility model. Please refer to [link / reference]. Figure 4 and Figure 5 and combined Figure 1 .

[0033] In some embodiments, a flattening groove 41 is provided on the end face of the contour block 4 facing the electrode tab. The flattening groove includes a first limiting surface 411 for centering the battery cell 5 and a second limiting surface 412 for flattening the battery cell electrode tab. The first limiting surface 411 and the second limiting surface 412 are arranged coaxially from the outside to the inside along the radial direction of the flattening groove 41.

[0034] Specifically, the flattening head 32 is equipped with a contour block 4 at its working end. The end face of the contour block 4 facing the tab of the battery cell 5 is provided with a flattening groove 41 whose contour matches the connection between the tab and the housing of the battery cell 5. During the flattening action, the inner contour of the flattening groove 41 causes the tab of the battery cell 5 to bend along the contour during the flattening process, thereby achieving a flattening effect of the tab at a certain angle.

[0035] The flattening groove 41 includes a first limiting surface 411 and a second limiting surface 412 coaxially arranged. The maximum diameter D1 defined by the first limiting surface 411 is greater than the maximum diameter D2 defined by the second limiting surface 412. The first limiting surface 411 is used to guide and initially position the tabs of the battery cell 5, guiding the tabs of the battery cell 5 to the center area of ​​the end face of the battery cell. The second limiting surface 412 is used to flatten and shape the tabs of the battery cell 5, so that the tabs of the battery cell 5 undergo precise plastic deformation at a preset angle and remain stable without springback. During the flattening process, the first limiting surface 411 with a larger diameter first contacts the outer side of the tab to perform initial alignment and pre-bending. Then, the top part of the tab enters the area of ​​the second limiting surface 412, which is more recessed, under the guidance of the first limiting surface, to receive the second stage of flattening and shaping. The third limiting surface 413 is used to prevent the tab of cell 5 from turning over. This flattening method can effectively avoid irregular bending of the tab of cell 5 during the flattening process, and achieve a high-quality layered progressive flattening effect.

[0036] In another embodiment, the flattening groove 41 further includes a third limiting surface 413 for preventing the tab from flipping over, the third limiting surface 413 being located between the first limiting surface 411 and the second limiting surface 412.

[0037] Specifically, the flattening groove 41 is provided with a third limiting surface 413, which is used to prevent the tab of the battery cell 5 from turning over during the flattening process. The third limiting surface 413 is located in the area between the first limiting surface 411 and the second limiting surface 412. The third limiting surface 413 can effectively avoid the tab from turning over or curling due to excessive bending angle at one time and lack of material channeling, greatly reducing the risk of rebound of the tab after flattening and ensuring the durability of the flatness of the tab of the battery cell 5 after flattening. In addition, the vertical depth of the three limiting surfaces increases sequentially from the outside to the inside, providing ample space for the longer part of the top of the tab to be accommodated and guided, ensuring that it can be smoothly guided into the flattening groove 41 and bent during the flattening process.

[0038] Furthermore, the contour block 4 and the flattening head 32 are detachably connected. The contour block 4 has a detachable structure, and the flattening head 32 can be equipped with a standardized quick-change connector. The rear of the contour block 4 has a matching interface. The two can be quickly locked and separated by means of buckles, locking pins, or magnetic auxiliary mechanisms. The flattening machine can flexibly configure contour blocks 4 at different angles according to different product process requirements, realizing high-quality and stable flattening operations on the 5-pole tabs of various specifications of battery cells, significantly improving the versatility and production efficiency of the equipment.

[0039] In some embodiments, on the cross section of the contour block 4, the included angle α between the two sides of the first limiting surface 411 is not equal to the included angle β between the two sides of the second limiting surface 412; multiple sets of flattening heads arranged along the cell conveying path have their flattening grooves with the included angle β increasing sequentially.

[0040] Specifically, the five tabs of the battery cell are first guided and bent by the first limiting surface 411, and then shaped and fixed by the second limiting surface 412. The angles formed by the two limiting surfaces are different, both of which serve a guiding function. The differentiated design of the angles between the two limiting surfaces is a way to achieve the progressive composite flattening of the tabs.

[0041] Furthermore, multiple flattening heads 32 are arranged along the cell conveying path. As the cells 5 are flattened sequentially, the included angle β of the flattening grooves 41 on the shaping blocks 4 of the flattening heads 32 increases sequentially, allowing the tabs of the cells 5 to undergo a progressive flattening process from initial alignment to final shaping. This design, with its progressively increasing included angle β, decomposes the traditional single high-strain flattening operation into multiple low-strain progressive forming processes, ensuring the flattening quality and consistency of the tabs of the cells 5 and effectively preventing damage to the tabs during the flattening process.

[0042] like Figure 4 and Figure 5 As shown, in some embodiments, the included angle β is greater than or equal to 100° and less than or equal to 180°.

[0043] Specifically, the included angle β formed by the second limiting surface 412 is greater than the included angle α formed by the first limiting surface 411, making the flattening groove 41 have a gentler and more guiding shape. The first limiting surface 411 helps to ensure the centering of the battery cell 5 and to perform initial alignment and guidance of the electrode tabs. Among them, the included angle α formed by the first limiting surface 411 and the included angle formed by the third limiting surface 413 can both be selected, but are not limited to, fixed tilt angles, while the included angle β formed by the second limiting surface 412 is a customized angle. The tilt angle presented by this included angle β is different in different contour blocks 4 and can be adjusted accordingly to achieve the flattening operation.

[0044] It is worth noting that in some embodiments, the outward opening angle β of the second limiting surface 412 is 150°, 160° and 168° respectively. The specific situation can be determined according to the actual production situation, and this application does not limit it.

[0045] In this embodiment, a contour block 4 is installed on the flattening head 32, and the contour block 4 is provided with a flattening groove 41 for flattening the tabs. The groove is provided with a first limiting surface 411 and a second limiting surface 412, which form a graded guide to achieve flattening of the tabs of the battery cell 5. The maximum diameter defined by the first limiting surface 411 in the flattening groove 41 is greater than the maximum diameter D2 defined by the third limiting surface 413, thereby effectively avoiding irregular bending of the tabs of the battery cell 5 during the flattening process and achieving a high-quality layered flattening effect. The included angle α formed by the first limiting surface 411 and the included angle β formed by the second limiting surface 412 can be customized according to actual needs to ensure the stability of the tab forming angle and the flatness of the flattening.

[0046] Example 3: This embodiment is a further structural optimization of the flattening machine of this utility model. Please refer to [link / reference]. Figures 1 to 3 .

[0047] In some embodiments, the flattening assembly 3 further includes a fixing plate 35, a linear guide rail 36, and a ball screw. The fixing plate 35 is mounted on the linear guide rail 36. One side of the fixing plate 35 is rotatably connected to the ball screw 36 via a bearing. The other side of the fixing plate 35 is equipped with multiple sets of the flattening heads 32. The driving end of the flattening drive member 31 is connected to one end of the ball screw.

[0048] Specifically, multiple flattening heads 32 can be mounted on a fixed plate 35 and distributed along the conveying direction of the battery cell 5. The flattening action is performed synchronously through the fixed plate 35. The fixed plate 35 is mounted on a linear guide rail 36, and the ball screw serves as a transmission component. The two ends of the ball screw are respectively fixed to the driving end of the flattening drive component 31 and the fixed plate 35. The ball screw is used to drive the ball screw to rotate in both directions, thereby driving the fixed plate 35 to move back and forth along the linear guide rail. This allows for adjustment of the distance between the flattening head 32 and the electrode tab. The ball screw, in conjunction with the linear guide rail 36, ensures that there is no positional deviation during the flattening process.

[0049] In some embodiments, the pressing assembly 2 includes a pressing cylinder 21 and a positioning member 22 driven by the pressing cylinder 21. The movement direction of the positioning member 22 is perpendicular to the flattening direction of the flattening head 32, and it is used to press and constrain the battery cell 5 from the side. The end of the positioning member 22 that contacts the side wall of the battery cell 5 is arc-shaped.

[0050] Specifically, the pressing assembly 2 drives the positioning component 22 via the pressing cylinder 21 to achieve lateral positioning of the battery cell 5. The movement direction of the positioning component 22 is perpendicular to the flattening direction of the flattening head 32, which is used to laterally press and constrain the battery cell 5 during the flattening operation, preventing the battery cell 5 from moving or vibrating during the flattening process. The end of the positioning component 22 that contacts the side wall of the battery cell 5 may be provided with an arc-shaped, V-shaped, or flexible padding contact portion to better adapt to the cylindrical or square housing structure of the battery cell 5, providing reliable constraint while avoiding damage to the battery cell 5.

[0051] In some embodiments, the flattening assembly 3 further includes a horizontal adjustment knob 33 and a vertical adjustment knob 34 for adjusting the position of the multiple flattening heads 32.

[0052] Specifically, both the horizontal adjustment knob 33 and the vertical adjustment knob 34 are mounted on the flattening head 32. The horizontal adjustment knob 33 is used to precisely adjust the position of the flattening head 32 along the length of the cell bracket 1, and to calibrate the alignment between the contour block 4 on the flattening head 32 and the electrode tab of the cell 5. The vertical adjustment knob 34 is used to precisely adjust the height of the flattening head 32 so that the contour block 4 on the flattening head 32 can be adapted to the radial distance of the electrode tab of the cell 5. The operator can ensure that each set of flattening heads 32 maintains precise concentricity with the end face of the cell 5 before operation, thereby ensuring that the electrode tabs of all cells 5 can obtain a uniform, consistent and high-quality flattening effect, while greatly simplifying the equipment debugging and changeover process.

[0053] Furthermore, these two adjustment knobs can control one set of flat-head 32 individually or control multiple sets of flat-head 32 simultaneously. The adjustment knobs are micrometer structures with precision threads, such as horizontal micrometer adjustment knobs and vertical micrometer adjustment knobs. Both can be equipped with locking nuts, which can be firmly locked in position after fine adjustment to achieve free fine adjustment and ensure the concentricity of flat-head 32 and battery cell 5.

[0054] In this embodiment, during the flattening process, the positioning member 22 in the pressing assembly 2 is driven by the pressing cylinder 21 to position the battery cell 5. The end of the positioning member 22 that contacts the side wall of the battery cell 5 may have a contact portion composed of an arc shape, a V shape, or a flexible pad, providing reliable constraint while avoiding damage to the battery cell 5. Before the flattening operation, the positional relationship of the flattening head 32 can be precisely adjusted by the horizontal adjustment knob 33 and the vertical adjustment knob 34 to ensure that the tabs of the battery cell 5 can achieve a high-quality flattening effect.

[0055] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0057] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0058] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0059] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A flattening machine, characterized in that, include: Cell support brackets are used to support and transport battery cells; A pressing component is disposed above the cell holder and is used to press and fix the cell located on the cell holder; as well as A flattening assembly is disposed on at least one side of the cell tray. The flattening assembly includes multiple sets of flattening heads arranged along the cell conveying path. The multiple sets of flattening heads are driven by a flattening drive component and are used to perform flattening operations on the tabs of the cell end face on the cell tray in sequence. The flat-head is equipped with contour blocks, and the contour blocks of the multiple sets of flat-heads have different flat-heading angles.

2. The flattening machine according to claim 1, characterized in that, The contour block has a flattening groove on its end face facing the electrode tab. The flattening groove includes a first limiting surface for centering the battery cell and a second limiting surface for flattening the battery cell electrode tab. The first limiting surface and the second limiting surface are coaxially arranged from the outside to the inside along the radial direction of the flattening groove.

3. The flattening machine according to claim 2, characterized in that, The flattening groove also includes a third limiting surface for preventing the tab from flipping over, the third limiting surface being located between the first limiting surface and the second limiting surface.

4. The flattening machine according to claim 2, characterized in that, On the cross-section of the contour block, the included angle α between the two sides of the first limiting surface is not equal to the included angle β between the two sides of the second limiting surface; Multiple sets of flattening heads are arranged along the cell conveying path, and the included angle β of the flattening grooves increases sequentially.

5. The flattening machine according to claim 4, characterized in that, The included angle β is greater than or equal to 100° and less than or equal to 180°.

6. The flattening machine according to claim 1, characterized in that, The flattening assembly also includes a fixing plate, a linear guide rail, and a ball screw. The fixing plate is mounted on the linear guide rail. One side of the fixing plate is rotatably connected to the ball screw via a bearing. Multiple sets of flattening heads are mounted on the other side of the fixing plate. The driving end of the flattening drive is connected to one end of the ball screw.

7. The flattening machine according to claim 1, characterized in that, The pressing assembly includes a pressing cylinder and a positioning member driven by the pressing cylinder. The movement direction of the positioning member is perpendicular to the flattening direction of the flattening head, and is used to laterally press and constrain the battery cell.

8. The flattening machine according to claim 7, characterized in that, The end of the positioning element that contacts the side wall of the battery cell is arc-shaped.

9. The flattening machine according to claim 1, characterized in that, The contour block is detachably connected to the flattening head.

10. The flattening machine according to claim 1, characterized in that, The flattening assembly also includes a horizontal adjustment knob and a vertical adjustment knob for adjusting the position of the multiple flattening heads.

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