Separator unwinding device and stacking device

Abstract

Separator unwinding device, characterized in that the following are arranged in sequence in the direction of movement of the separator (9): an unwinding mechanism (1), a splice platform (2), a tension dancer roller mechanism (3), a buffer mechanism (4), a micro tension control mechanism (5) and a separator web edge control (6); wherein the micro tension control mechanism (5) comprises: a drive component (501); a tension roller (502) and a rocker arm (503), wherein the tension roller (502) is connected to the drive component (501) via the rocker arm (503), wherein the drive component (501) serves to pivot the rocker arm (503) in order to allow the tension roller (502) to relax or tighten the separator (9).

Description

Technical field

[0001] The present utility model relates to the technical field of battery manufacturing equipment and in particular to a separator unwinding device and a stacking device. Background technology

[0002] In the battery manufacturing process, a separator unwinding device is generally used to unwind the separator of the battery cell.

[0003] During the unwinding process, insufficient tension on the separator can lead to problems such as slackness and unwinding, which impairs the uniformity of the separator unwinding and reduces the unwinding effect. Therefore, known separator unwinding devices apply a higher tension to the separator during unwinding. However, applying a higher tension easily leads to greater tension fluctuations in the separator, subjecting it to excessively high tensile forces. This can cause cracking and thus reduce the reliability of the separator unwinding device. Content of the utility model

[0004] In light of this, the present utility model provides a separator unwinding device and a stacking device to solve the problem that, in known separator unwinding devices, the tension fluctuation of the separator is greater during the unwinding process and the separator easily tears, leading to the poor reliability of the separator unwinding device.

[0005] In a first aspect, the present utility model provides a separator unwinding device in which, arranged in the direction of movement of the separator, are: an unwinding mechanism, a splicing platform, a tension dancer roller mechanism, a buffer mechanism, a micro-tension control mechanism and a separator web edge control; wherein The micro-voltage control mechanism includes: a drive component; a tension roller and a rocker arm, wherein the tension roller is connected to the drive component via the rocker arm, the drive component serving to pivot the rocker arm to allow the tension roller to relax or tighten the separator.

[0006] In a second aspect, the present utility model also provides a stacking device comprising: a stacking table; the above-mentioned separator unwinding device, wherein the stacking table is arranged on the side of the separator web edge control facing away from the micro tension control mechanism, wherein the separator passes through the separator web edge control and enters the stacking table.

[0007] Advantageous Effects: The present utility model performs the unwinding of the separator by the unwinding mechanism and provides the separator's kinetic energy. The separator then enters the splicing platform for roll exchange and splicing. The tensioning dancer roller mechanism adjusts the separator's tension in real time after the splicing platform. The buffering mechanism buffers the separator, effectively reducing external resistance during the separator's movement and compensating for the separator's speed at the unwinding mechanism and its speed upon entry into the stacking table. The rocker arm is pivoted by the drive component to allow the tensioning roller to release or tighten the separator, thus enabling precise control of the separator tension. This reduces tension fluctuations and prevents cracking, resulting in stable separator unwinding and high reliability. Illustration of the attached figures

[0008] To more clearly explain the specific embodiments of the present utility model or the prior art technical solutions, the drawings to be used in the description of the specific embodiments or the prior art are briefly presented. It is obvious that the drawings in the following description represent some embodiments of the present utility model, and that a person skilled in the art can derive other drawings from these without any creative effort. Fig. Figure 1 is a schematic structural view of a separator unwinding device according to an embodiment of the present utility model; Fig. Figure 2 is a schematic structural view of a micro-voltage control mechanism of the separator unwinding device according to an embodiment of the present utility model. Explanation of reference symbols:

[0009] Unwinding mechanism 1; Splicing platform 2; Tension dancer roller mechanism 3; Buffer mechanism 4; First partial roll 401; Second partial roll 402; Micro tension control mechanism 5; Drive component 501; Telescopic element 5011; Proportional valve 5012; Tension roller 502; Rocking arm 503; Fixed shaft 504; Force application roller 505; Separator web edge control 6; Main drive mechanism 7; Main drive roller 701; Main follower roller 702; Stacking table 8; Separator 9; Deflection roller 10. Specific embodiments

[0010] To clarify the purpose, technical solution, and advantages of the embodiments of this utility model, the technical solution in these embodiments is described clearly and completely below with reference to the drawings in those embodiments. Obviously, the described embodiments represent only a portion of the embodiments of this utility model and not all of them. All other embodiments that a person skilled in the art could derive from the embodiments in this utility model without inventive activity fall within the scope of protection of this utility model.

[0011] The battery cell comprises a battery cell body, which includes a separator and two electrodes of opposite polarity, namely the positive electrode and the negative electrode. The battery cell body operates through the movement of metal ions between the positive and negative electrodes. The battery cell cycle is the process of metal ions moving from the positive electrode to the negative electrode and then from the negative electrode to the positive electrode. The battery cell further comprises tabs, the tabs being electrically connected to the electrodes, with the positive tab being electrically connected to the positive electrode and the negative tab being electrically connected to the negative electrode. Charging and discharging of the battery cell are effected through the positive and negative tabs.The electrode comprises a current collector and an active material layer, the active material layer being coated onto the surface of the current collector. If the electrode is a positive electrode, the current collector can be made of aluminum, and the active material layer can be made of lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate. If the electrode is a negative electrode, the current collector can be made of copper, and the active material layer can be made of carbon or silicon. The separator serves as an insulating layer to prevent an internal short circuit in the battery caused by contact between the positive and negative electrodes, and it acts as a semipermeable layer to prevent the passage of large volumes of molecules while allowing the passage of small volumes of charged ions.

[0012] The following will refer to Fig. 1 to Fig. 2 the embodiments of the present utility model are described.

[0013] According to one embodiment of the present utility model, in a first aspect, as in Fig. Figure 1 shows a separator unwinding device in which the following are arranged in sequence in the direction of movement of the separator 9: the unwinding mechanism 1, the splicing platform 2, the tension dancer roller mechanism 3, the buffer mechanism 4, the micro tension control mechanism 5 and the separator web edge control 6.

[0014] Furthermore, the micro-tension control mechanism 5 comprises: the drive component 501, the tension roller 502 and the rocker arm 503, wherein the tension roller 502 is connected to the drive component 501 via the rocker arm 503, wherein the drive component 501 serves to pivot the rocker arm 503 in order to allow the tension roller 502 to relax or tighten the separator 9.

[0015] It is evident from this that the separator unwinding device provided by the embodiment of the present utility model performs the unwinding of the separator 9 by the unwinding mechanism 1 and provides the kinetic energy of the separator 9. The separator 9 then enters the splicing platform 2 for roll exchange and splicing, wherein the tension dancer roller mechanism 3 adjusts the tension of the separator 9 after the splicing platform 2 in real time, the buffer mechanism 4 buffers the separator 9, effectively reduces the external resistance during the separator 9's movement, and compensates for the speed of the separator 9 at the unwinding mechanism 1 and its speed upon entry into the stacking table 8.The rocker arm 503 is pivoted by the drive component 501 to allow the tension roller 502 to release or tighten the separator 9, thereby precisely controlling the tension of the separator 9, reducing tension fluctuations, and thus preventing cracking. This results in stable unwinding of the separator 9 and ensures high reliability. Furthermore, the separator web edge control 6 ensures that the relative position of the separator 9 is fixed, allowing it to enter the stacking table 8 stably.

[0016] It should be noted that the embodiment of the present utility model does not restrict the specific structure of the unwinding mechanism 1. Any known structure can be selected as required; for example, the unwinding mechanism 1 can use an electric unwinding machine, a pneumatic unwinding device, etc. Likewise, the embodiment of the present utility model does not restrict the splicing platform 2 and the tension dancer roller mechanism 3. For example, the splicing platform 2 can use a manual splicing platform. The tension dancer roller mechanism 3 comprises a cylinder, a control valve, and several deflection rollers, wherein the cylinder is electrically connected to the control valve and the extension and retraction ends of the cylinder have an adjusting roller.By controlling the extension and retraction of the cylinder via the control valve, the extending and retracting mechanism actuates the adjusting roller, thus tensioning or releasing the separator 9 and precisely controlling its unwinding tension. The multiple deflection rollers are used for carrying and transporting the separator 9.

[0017] In one embodiment, the drive component 501 comprises, as shown in Fig. 1 and Fig. Figure 2 shows the telescopic element 5011 and the proportional valve 5012, wherein the telescopic element 5011 is electrically connected to the proportional valve 5012, wherein the extension and retraction of the telescopic element 5011 can be precisely controlled by the proportional valve 5012 in order to pivot the rocker arm 503 and thereby allow the tension roller 502 to relax or tighten the separator 9, to control the tension of the separator 9, to reduce tension peaks during deflection and to improve the stability of the transport of the separator 9.

[0018] In particular, the telescopic element 5011 can use conventional telescopic elements, such as a cylinder, a telescopic motor, etc. The proportional valve 5012 can use an electric proportional valve. The embodiment of the present utility model does not impose any further restrictions in this regard.

[0019] Furthermore, the separator unwinding device can also include a voltage sensor to detect the voltage of the separator 9 in real time, wherein the voltage sensor is electrically connected to the proportional valve 5012 and the proportional valve 5012 adjusts the stroke of the telescopic element 5011 in real time according to the voltage detected by the voltage sensor in order to reduce voltage fluctuations.

[0020] Furthermore, in one embodiment, as in Fig. Figure 2 shows the micro-tension control mechanism 5 further comprising a fixed axis 504, wherein the fixed axis 504 is arranged on one side of the separator 9, and wherein the rocker arm 503 is pivotably arranged on the fixed axis 504. The fixed axis 504 serves to support the rocker arm 503, wherein the rocker arm 503 rotates about the fixed axis 504 to cause the two ends of the rocker arm 503 to rotate in opposite directions. One end of the rocker arm 503 is rotatably connected to the telescopic element 5011, and the other end has the tension roller 502.

[0021] When the tension of the separator 9 needs to be reduced, the extension of the telescopic element 5011 is controlled by the proportional valve 5012, whereby the end of the rocker arm 503 connected to the tension roller 502 actuates the tension roller 502 to release the tension of the separator 9, thereby reducing the tension of the separator 9.

[0022] If the tension of the separator 9 needs to be increased, the proportional valve 5012 controls the retraction of the telescopic element 5011, whereby the end of the rocker arm 503 connected to the tensioning roller 502 actuates the tensioning roller 502 to tension the separator 9, thereby increasing the tension of the separator 9.

[0023] It should be noted that the embodiment of the present utility model does not restrict the pivotable nature of the rocker arm 503 and the fixed axis 504. Any known rotational form can be selected as required. For example, a round opening can be provided in the central region of the rocker arm 503, with the fixed axis 504 rotating through the round opening relative to the rocker arm 503. Furthermore, several round openings can be provided on the rocker arm 503, with the fixed axis 504 being selected as required to be installed in the corresponding round opening in order to precisely control the magnitude of the tension of the separator 9 in conjunction with the stroke of the telescopic element 5011 according to the distance of the lever arm.

[0024] Furthermore, in one embodiment, as in Fig. Figure 2 shows a force introduction roller 505 mounted near the end of the rocker arm 503 on the telescopic element 5011, the force introduction roller 505 being pivotally connected to the extension and retraction ends of the telescopic element 5011. This pivotal connection of the force introduction roller 505 to the extension and retraction ends of the telescopic element 5011 avoids direct frictional contact between the extension and retraction ends of the telescopic element 5011, reduces wear on both the extension and retraction ends of the telescopic element 5011 and the rocker arm 503, and extends the service life. The force introduction roller 505 can also act as a buffer to absorb the impact force during the movement process. Furthermore, the arrangement of the force introduction roller 505 also contributes to improved movement precision, i.e., improved control precision of the tension of the separator 9.

[0025] In one embodiment, as in Fig. As shown in Figure 1, the micro-tension control mechanism 5 is arranged as a pair, wherein the pair of micro-tension control mechanisms 5 is arranged on opposite sides of the separator 9, leaving a gap for the passage of the separator 9 between the pair of tension rollers 502.

[0026] In particular, during the battery cell stacking process, the separator 9, supplied by the separator unwinding device, must be switched back and forth between the positive electrode side and the negative electrode side. As shown in Fig. As shown in Figure 1, the separator 9 must be switched back and forth between position A and position B, whereby the speed change of the separator 9 is greater and the voltage fluctuation is greater during the switching process. By arranging a pair of micro-voltage control mechanisms 5 in the embodiment of the present utility model, the voltage on both sides of the separator 9 is controlled by a pair of tension rollers 502, thereby effectively reducing the speed change of the separator 9, lowering the voltage fluctuation, and significantly improving the stability and reliability of the separator unwinding device.

[0027] In addition, the precise control of the voltage by the separator unwinding device can also improve the application range of the separator 9 in order to reduce the manufacturing costs of the battery cell.

[0028] In one embodiment, as in Fig. As shown in Figure 1, the buffer mechanism 4 is a multi-stage buffer mechanism comprising: several first partial rollers 401 and several second partial rollers 402, wherein the several first partial rollers 401 are spaced apart on a first side, and wherein the several second partial rollers 402 are spaced apart on a second side, with the first side being opposite the second side, for example, the first side being the top side and the second side being the bottom side, or the first side being the front side and the second side being the rear side. The separator 9 passes alternately through the first partial roller 401 and the second partial roller 402.By arranging the multiple first partial rollers 401 and the multiple second partial rollers 402, the buffer distance can be effectively reduced, the corresponding acceleration reduced, and thereby the external resistance during separator operation 9 effectively reduced and the voltage fluctuation of the separator 9 reduced.

[0029] Furthermore, as in Fig. Figure 1 shows a deflection roller 10 arranged between the buffer mechanism 4 and the micro-voltage control mechanism 5. The deflection roller 10 serves to adjust the direction of the separator 9 so that the separator 9 enters the micro-voltage control mechanism 5.

[0030] It should be noted that the embodiment of the present utility model does not limit the number of first sub-rolls 401 and second sub-rolls 402. Two, three, or more than three can be selected as required.

[0031] Examples include, as in Fig. Figure 1 shows two first partial rollers 401 and three second partial rollers 402 arranged, the three second partial rollers 402 being collinear and the line formed by the two first partial rollers 401 being parallel to the line formed by the three second partial rollers 402. The separator 9 passes alternately through the second partial roller 402 and the first partial roller 401.

[0032] In one embodiment, as in Fig. As shown in Figure 1, a main drive mechanism 7 is arranged between the tension dancer roller mechanism 3 and the buffer mechanism 4. Before the separator 9 leaves the tension dancer roller mechanism 3 and enters the buffer mechanism 4, the main drive mechanism 7 reduces the tension fluctuations of the unwinding of the separator 9.

[0033] Furthermore, in one embodiment, as in Fig. Figure 1 shows the main drive mechanism 7, the main drive roller 701. Along a first direction, the main drive roller 701 is arranged between the several first partial rollers 401 and the several second partial rollers 402, and along a second direction, the main drive roller 701 is arranged between the tension-dancer roller mechanism 3 and the buffer mechanism 4. The main drive roller 701 can eliminate the fluctuations of the separator 9 from the unwinding mechanism 1 to the main drive roller 701, with the tension being redistributed by the main drive roller 701 to achieve precise control of the tension of the separator 9.

[0034] In particular, the first direction is the transport direction of the separator 9 between the first partial roller 401 and the second partial roller 402, as indicated by the arrow X in Fig. Figure 1 shows the direction of transport of the separator 9 between the tension dancer roller mechanism 3 and the buffer mechanism 4, as indicated by the arrow Y in Figure 1. Fig. 1 shown.

[0035] It should be noted that in the embodiment of the present utility model, the main drive roller 701 and the unwinding mechanism 1 are used to move the separator 9, while the other rollers are all follower rollers.

[0036] Furthermore, in one embodiment, as in Fig.Figure 1 shows the main drive mechanism 7 and the main follower roller 702. The main follower roller 702 is arranged on the side of the main drive roller 701 facing away from the micro-tension control mechanism 5, with a gap left between the main follower roller 702 and the main drive roller 701 to allow the separator 9 to pass through. The arrangement of the main follower roller 702 is advantageous for stabilizing the tension of the separator 9 as it enters the buffer mechanism 4 and for preventing wrinkling of the separator 9. Furthermore, after the separator 9 has passed through the gap between the main drive roller 701 and the main follower roller 702 and before entering the buffer mechanism 4, the friction between the separator 9 and the main drive roller 701 can be reduced, which contributes to extending the service life of the main drive roller 701.

[0037] The operating principle of the embodiment of the present utility model is as follows: The separator 9 is installed on the unwinding mechanism 1 and moves through the unwinding mechanism 1 to the splicing platform 2 for roll change and connection. The separator 9 then enters the tension dancer roller mechanism 3 to control the tension of the unwound separator 9. After passing the main drive roller 701, the separator 9 enters the buffer mechanism 4 for buffering, alternately passing the first partial roller 401 and the second partial roller 402. Finally, the separator 9 enters the micro-tension control mechanism 5 via the deflection roller 10. The proportional valve 5012 of the micro-tension control mechanism 5 controls the extension and retraction of the telescopic element 5011 to cause the rocker arm 503 to rotate about the fixed axis 504, thereby allowing the tension roller 502 to relax or tighten the separator 9 in order to control the tension of the separator 9.Finally, after passing through the separator web edge control 6, the separator 9 enters the stacking table 8.

[0038] To realize the basic functions of the separator unwinding device, the separator unwinding device in this embodiment may also include other necessary modules or components, such as a frame, a control system, etc. It should be noted that any suitable known structure may be selected for the other necessary modules or components included in the separator unwinding device. To describe the technical solution provided in this embodiment clearly and concisely, the above parts are not discussed in detail, and the drawings accompanying the description have also been simplified accordingly. However, it should be understood that this does not limit the scope of the present utility model.

[0039] According to an embodiment of the present utility model, a stacking device is further provided in another aspect, which essentially comprises: the stacking table 8 and the separator unwinding device, wherein the stacking table 8 is arranged on the side of the separator web edge control 6 facing away from the micro tension control mechanism 5, wherein the separator 9 passes through the separator web edge control 6 and enters the stacking table 8.

[0040] The stacking device provided by the embodiment of the present utility model performs the unwinding of the separator 9 by the unwinding mechanism 1 and provides the kinetic energy of the separator 9. The separator 9 then enters the splicing platform 2 for roll exchange and splicing, wherein the tension dancer roller mechanism 3 adjusts the tension of the separator 9 after the splicing platform 2 in real time, the buffer mechanism 4 buffers the separator 9, effectively reduces the external resistance during the movement of the separator 9, and compensates for the speed of the separator 9 at the unwinding mechanism 1 and the speed upon entry into the stacking table 8.The rocker arm 503 is pivoted by the drive component 501 to allow the tension roller 502 to relax or tighten the separator 9, thereby enabling precise control of the tension of the separator 9, reducing tension fluctuations of the separator 9, thus preventing cracking of the separator 9, ensuring stable unwinding of the separator 9 and exhibiting high reliability.

[0041] Furthermore, after the voltage fluctuation of the separator 9 has been reduced, damage to the edges of the separator 9 during the stacking process can also be effectively reduced, and defects such as the puncture of the separator 9 by foreign bodies can be reduced.

[0042] Although the embodiments of the present utility model have been described in conjunction with the drawings, the person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present utility model, such changes and modifications falling within the scope of protection defined by the attached claims.

[0043] This utility model relates to the technical field of battery manufacturing equipment and discloses a separator unwinding device and a stacking device. The separator unwinding device comprises, arranged in sequence in the direction of movement of the separator: an unwinding mechanism, a splicing platform, a tension dancer roller mechanism, a buffer mechanism, a micro-tension control mechanism, and a separator web edge control. The micro-tension control mechanism comprises: a drive component; a tension roller and a rocker arm; the tension roller being connected to the drive component via the rocker arm, the drive component serving to pivot the rocker arm to allow the tension roller to release or release tension on the separator.The separator unwinding device provided by the present utility model uses the drive component to pivot the rocker arm and to allow the tension roller to relax or tension the separator, thereby enabling precise control of the separator tension, reducing tension fluctuations and thus preventing cracking, resulting in stable separator unwinding and high reliability.

Claims

[1] Separator unwinding device, characterized by , that in the direction of movement of the separator (9) are arranged in sequence: an unwinding mechanism (1), a splice platform (2), a tension dancer roller mechanism (3), a buffer mechanism (4), a micro tension control mechanism (5) and a separator web edge control (6); wherein the micro tension control mechanism (5) comprises: a drive component (501); a tension roller (502) and a rocker arm (503), wherein the tension roller (502) is connected to the drive component (501) via the rocker arm (503), wherein the drive component (501) serves to pivot the rocker arm (503) in order to allow the tension roller (502) to relax or tighten the separator (9). [2] Separator unwinding device according to claim 1, characterized by, that the drive component (501) comprises a telescopic element (5011) and a proportional valve (5012), wherein the proportional valve (5012) extends and retracts the telescopic element (5011) to pivot the rocker arm (503). [3] Separator unwinding device according to claim 2, characterized by , that the micro-tension control mechanism (5) further comprises a fixed axis (504), wherein the fixed axis (504) is arranged on one side of the separator (9), wherein the rocker arm (503) is pivotably arranged on the fixed axis (504), wherein one end of the rocker arm (503) is rotatably connected to the telescopic element (5011), and the other end has the tension roller (502). [4] Separator unwinding device according to claim 3, characterized by, that the rocker arm (503) has a force introduction roller (505) at the end which is near the telescopic element (5011), wherein the force introduction roller (505) is pivotally connected to the extension and retraction end of the telescopic element (5011). [5] Separator unwinding device according to any one of claims 1 to 4, characterized by , that the micro-tension control mechanism (5) is arranged as a pair, wherein the pair of micro-tension control mechanisms (5) is arranged on opposite sides of the separator (9), leaving a gap for the passage of the separator (9) between the pair of tension rollers (502). [6] Separator unwinding device according to any one of claims 1 to 4, characterized by, that the buffer mechanism (4) is a multi-stage buffer mechanism comprising: several first partial rollers (401) and several second partial rollers (402), wherein the several first partial rollers (401) are spaced apart on a first side, wherein the several second partial rollers (402) are spaced apart on a second side, the first side being opposite the second side, wherein the separator (9) alternately passes through the first partial roller (401) and the second partial roller (402). [7] Separator unwinding device according to claim 6, characterized by , that a main drive mechanism (7) is further arranged between the tension dancer roller mechanism (3) and the buffer mechanism (4). [8] Separator unwinding device according to claim 7, characterized by, that the main drive mechanism (7) comprises a main drive roller (701), wherein the main drive roller (701) is arranged along a first direction between the multiple first partial rollers (401) and the multiple second partial rollers (402), and wherein the main drive roller (701) is arranged along a second direction between the tension dancer roller mechanism (3) and the buffer mechanism (4). [9] Separator unwinding device according to claim 8, characterized by , that the main drive mechanism (7) further comprises a main follower roller (702), wherein the main follower roller (702) is arranged on the side of the main drive roller (701) facing away from the micro-tension control mechanism (5), wherein a gap is left between the main drive roller (701) and the main follower roller (702) for the passage of the separator (9). [10] Stacking device, characterized by , that this includes: a stacking table (8); and a separator unwinding device according to any one of claims 1 to 9, wherein the stacking table (8) is arranged on the side of the separator web edge control (6) facing away from the micro tension control mechanism (5), wherein the separator (9) passes through the separator web edge control (6) and enters the stacking table (8).

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