Battery strip changing apparatus and method, and die cutter

Abstract

The present disclosure provides a battery material tape changing device and method, and a die cutting machine, and relates to the technical field of battery production, so as to at least solve the problems of battery material tape powder dropping and affecting the accuracy of die cutting machine operation in the related art due to the use of torque control mode. The battery material tape changing device comprises: a first unwinding roller and a second unwinding roller, the first unwinding roller is used for unwinding the battery material tape, and the second unwinding roller is used for unwinding the standby battery material tape; a changing device is used for pulling the material tape of the first unwinding roller to move; a control device is used for, in response to receiving a changing signal, controlling the changing device to pull the tail of the battery material tape on the first unwinding roller to be jointed with the head of the battery material tape on the second unwinding roller at a fixed movement speed, and controlling the changing device to cut off the battery material tape on the first unwinding roller.

Description

Technical Field

[0001] This disclosure relates to, but is not limited to, the field of battery manufacturing technology, and particularly to a battery strip rewinding device and method, and a die-cutting machine. Background Technology

[0002] In related technologies, during the battery production process, a die-cutting machine is used to cut battery strips to form tabs. During the roll changing process of the die-cutting machine, a torque control mode is usually adopted (i.e., the movement speed and torque are both variable), which makes it easy for the roll changing device and the unwinding roller to collide, causing the battery strip to shed powder, which in turn affects the accuracy of the die-cutting machine. Summary of the Invention

[0003] This disclosure provides a battery strip rewinding device and method, and a die-cutting machine.

[0004] The technical solution of this disclosure embodiment is implemented as follows:

[0005] This disclosure provides a battery tape changing device, including:

[0006] A first unwinding roller and a second unwinding roller, wherein the first unwinding roller is used to unwind the battery strip and the second unwinding roller is used to unwind spare battery strip.

[0007] A roll changing device is used to pull the material strip of the first unwinding roller to move;

[0008] A control device is configured to, in response to receiving a roll change signal, control the roll changer to pull the tail end of the battery strip on the first unwinding roller and engage the head end of the battery strip on the second unwinding roller at a fixed speed, and control the roll changer to cut the battery strip on the first unwinding roller.

[0009] In some embodiments, the control device is further configured to: in response to receiving the roll change signal, control the roll changer to move the tail end of the battery strip on the first unwinding roller to a first position according to a first control mode; wherein the movement speed in the first control mode is a variable movement speed; in response to determining a target position, control the roll changer to move the tail end of the battery strip on the first unwinding roller from the first position to a second position according to a second control mode, such that the tail end of the battery strip on the first unwinding roller engages with the head end of the battery strip on the second unwinding roller; wherein the movement speed in the second control mode is the fixed movement speed; and control the roll changer to cut the battery strip on the first unwinding roller based on the target position.

[0010] In this embodiment, firstly, by employing different control modes at different stages, the accuracy of the winding device operation is improved; secondly, in the first stage, a variable speed is used to quickly move to the first position, which shortens the movement time and improves the winding efficiency compared to using a fixed speed; finally, in the second stage, a fixed speed is used to move to the second position, which reduces the possibility of collision between the winding device and the unwinding roller compared to using a variable speed, thereby improving the quality and performance of the battery strip.

[0011] In some embodiments, the control device is further configured to: determine the target location based on the detection information from the first detection device.

[0012] In this embodiment of the disclosure, by automatically identifying the target position in the roll changing device, the accuracy of the target position is improved and the automation level of the equipment is enhanced.

[0013] In some embodiments, the rewinding device further includes a drive unit connected to the rewinding device; the control unit is further configured to send a first control command to the drive unit in response to receiving the rewinding signal; the drive unit is configured to receive the first control command and, according to the first control mode, drive the rewinding device to pull the tail end of the battery material strip on the first unwinding roller to the first position.

[0014] In this embodiment, on the one hand, the driving device is controlled by a first control command, which improves the accuracy of control; on the other hand, the driving device drives the changing device to pull the first unwinding roller to the first position according to the changing speed, which shortens the movement time and improves the changing efficiency compared to a constant speed.

[0015] In some embodiments, the driving device is further configured to: drive the winding device to rotate from an initial position to a preset position; drive the winding device to move along a first direction from the preset position to a third position, so that the winding device passes through the battery strip on the first unwinding roller; and, according to the first control mode, drive the winding device to pull the tail of the battery strip on the first unwinding roller to the first position along a second direction; wherein the second direction is perpendicular to the first direction.

[0016] In this embodiment, on the one hand, the drive device drives the roll changing device to move from the initial position to the third position so as to accurately pass through the battery material strip on the first unwinding roller; on the other hand, the drive device drives the roll changing device to pull the first unwinding roller to the first position according to the varying speed, which shortens the movement time and improves the roll changing efficiency compared to a constant speed.

[0017] In some embodiments, the rewinding device further includes a drive unit connected to the rewinding device; the control unit is further configured to send a second control command to the drive unit in response to determining the target position; the drive unit is further configured to receive the second control command and drive the rewinding device to pull the tail of the battery material strip on the first unwinding roller from the first position to the second position according to the second control mode.

[0018] In this embodiment, on the one hand, the driving device is controlled by a second control command, which improves the accuracy of control; on the other hand, the driving device drives the changing device to pull the first unwinding roller to the second position at a fixed speed, which reduces the possibility of collision between the changing device and the unwinding roller compared to a variable speed, thereby improving the quality and performance of the battery strip.

[0019] In some embodiments, the rewinding device includes a rewinding pressure roller and a cutter located on the rewinding pressure roller; the control device is further configured to, in response to receiving the rewinding signal, control the rewinding pressure roller to pull the tail end of the battery strip on the first unwinding roller to engage the head end of the battery strip on the second unwinding roller at the fixed motion speed; and control the cutter to extend to cut the battery strip on the first unwinding roller.

[0020] In this embodiment of the disclosure, by integrating the cutter into the roll changing device, compared with setting up the cutter separately, not only is the cost and equipment complexity reduced, but the application scenarios of the roll changing device are also broadened.

[0021] This disclosure also provides a method for changing the roll of battery material strip, the method comprising:

[0022] In response to receiving a roll change signal, the roll change device is controlled to pull the tail end of the battery strip on the first unwinding roller and engage the head end of the battery strip on the second unwinding roller at a fixed speed; wherein, the first unwinding roller is used to unwind the battery strip, and the second unwinding roller is used to unwind the spare battery strip.

[0023] The control device cuts the battery material strip on the first unwinding roller.

[0024] In this embodiment, firstly, automatic roll changing is performed by a roll changing device, which reduces labor costs and improves efficiency and automation compared to manual roll changing. Secondly, by integrating the cutting function into the roll changing device, compared to setting up a separate cutting device, not only are costs and equipment complexity reduced, but the application scenarios of the roll changing device are also broadened. Finally, by controlling the roll changing device to move the battery strip at a fixed speed, compared to using a variable speed, the possibility of collision between the roll changing device and the unwinding roller is reduced, thereby reducing the possibility of strip powder shedding. This improves the performance of the strip while also enhancing the accuracy of the die-cutting machine, meeting the needs of high-timeliness and high-efficiency production.

[0025] In some embodiments, the step of controlling the rewinding device to engage the tail end of the battery strip on the first unwinding roller with the head end of the battery strip on the second unwinding roller at a fixed speed in response to receiving the rewinding signal includes: in response to receiving the rewinding signal sent by the second detection device, sending a control command to the drive device, such that the drive device, based on the control command, drives the rewinding device to engage the tail end of the battery strip on the first unwinding roller with the head end of the battery strip on the second unwinding roller at the fixed speed.

[0026] In this embodiment, on the one hand, the control accuracy is improved by controlling the drive device through control commands; on the other hand, by driving the change device to pull the first unwinding roller at a fixed speed, the possibility of collision between the change device and the unwinding roller is reduced compared to a variable speed, thereby improving the quality and performance of the battery strip.

[0027] In some embodiments, the control command includes a first control command and a second control command; the step of sending a control command to the drive device in response to receiving the roll change signal sent by the second detection device, so that the drive device drives the roll change device to pull the tail of the battery strip on the first unwinding roller to engage with the head of the battery strip on the second unwinding roller at the fixed movement speed, includes: in response to receiving the roll change signal sent by the second detection device, sending the first control command to the drive device, so that the drive device, based on the first control command and in a first control mode, drives the roll change device to move the tail of the battery strip on the first unwinding roller to a first position; wherein the movement speed in the first control mode is a variable movement speed; in response to determining a target position, sending the second control command to the drive device, so that the drive device, based on the second control command and in a second control mode, drives the roll change device to move the tail of the battery strip on the first unwinding roller from the first position to a second position; wherein the movement speed in the second control mode is the fixed movement speed.

[0028] In this embodiment, firstly, by employing different control commands at different stages, the accuracy of the winding device operation is improved; secondly, in the first stage, a variable speed is used to quickly move to the first position, which shortens the movement time and improves the winding efficiency compared to using a fixed speed; finally, in the second stage, a fixed speed is used to move to the second position, which reduces the possibility of collision between the winding device and the unwinding roller compared to using a variable speed, thereby improving the quality and performance of the battery strip.

[0029] In some embodiments, controlling the winding device to cut the battery strip on the first unwinding roller includes: controlling the cutter on the winding device to extend; and controlling the cutter to cut the battery strip on the first unwinding roller.

[0030] In this embodiment of the disclosure, by integrating the cutter into the roll changing device, compared with setting up the cutter separately, not only is the cost and equipment complexity reduced, but the application scenarios of the roll changing device are also broadened.

[0031] This disclosure also provides a die-cutting machine, which includes an unwinding mechanism, a cutting mechanism, and a winding mechanism arranged sequentially along the conveying direction of the battery material strip, wherein:

[0032] The unwinding mechanism includes any of the above-described rewinding devices for releasing the battery material strip;

[0033] The cutting mechanism is used to cut the battery strip to form tabs;

[0034] The winding mechanism is used to wind up the battery material strip.

[0035] In this embodiment, firstly, automatic roll changing via a roll-changing device reduces labor costs and improves efficiency and automation compared to manual roll changing. Secondly, integrating the cutting function into the roll-changing device reduces costs and equipment complexity compared to a separate cutting device, and broadens the application scenarios of the roll-changing device. Thirdly, controlling the roll-changing device to move the battery strip at a fixed speed reduces the possibility of collision between the roll-changing device and the unwinding roller compared to using a variable speed, thereby reducing the possibility of strip powder shedding. This improves both the performance of the strip and the accuracy of the die-cutting machine, meeting the demands of high-efficiency and high-timeliness production. Finally, integrating different mechanisms into the die-cutting equipment enhances its versatility and adaptability, reducing battery production costs while improving production efficiency and quality.

[0036] In some embodiments, the winding mechanism includes a winding roller, a spare winding roller, and a tape receiving device, wherein the tape receiving device is used to cut the unwound battery material tape and wind it onto the spare winding roller after the winding roller has finished winding.

[0037] In this embodiment of the disclosure, the tape splicing device enables automatic winding and splicing, improving winding efficiency and thus enhancing the working efficiency of the die-cutting machine.

[0038] In some embodiments, the die-cutting machine further includes at least one of the following: a slitting mechanism, a third detection device, a marking mechanism, a dust removal mechanism, a web guiding mechanism, and a tension adjusting mechanism, wherein: the slitting mechanism is located between the cutting mechanism and the winding mechanism, and is used to slit the battery strip; the third detection device is located in the unwinding mechanism and / or in the slitting mechanism, and is used to acquire images of the battery strip; based on the images of the battery strip, a detection result of the battery strip is determined; wherein the detection result characterizes whether the battery strip has defects; the marking mechanism is located in the cutting mechanism and / or in the slitting mechanism. The mechanism between the unwinding mechanism and the winding mechanism is used to mark the battery strip if the inspection results indicate defects; the dust removal mechanism, located between the cutting mechanism and the slitting mechanism, and / or between the slitting mechanism and the winding mechanism, is used to remove dust from the battery strip after cutting; the correction mechanism, located between the unwinding mechanism and the cutting mechanism, and / or between the cutting mechanism and the slitting mechanism, is used to correct the deviation of the battery strip; the tension adjustment mechanism, located between the slitting mechanism and the winding mechanism, is used to adjust the winding tension of the winding mechanism.

[0039] In this embodiment of the disclosure, by integrating a multi-functional mechanism into the die-cutting equipment, the functions of the die-cutting machine are enriched, which not only improves the quality of die-cutting but also increases the efficiency of die-cutting, thereby enhancing the versatility and adaptability of the die-cutting machine.

[0040] In this embodiment of the disclosure, the rewinding device includes a first unwinding roller, a second unwinding roller, a rewinding device, and a control device. The first unwinding roller is used to unwind battery strip, and the second unwinding roller is used to unwind spare battery strip. The rewinding device is used to pull the strip on the first unwinding roller to move. The control device is used to respond to receiving a rewinding signal, control the rewinding device to pull the tail of the battery strip on the first unwinding roller to engage with the head of the battery strip on the second unwinding roller at a fixed speed, and control the rewinding device to cut the battery strip on the first unwinding roller. In this way, firstly, automatic roll changing by the roll changing device reduces labor costs and improves efficiency and automation compared to manual roll changing. Secondly, by integrating the cutting function into the roll changing device, compared to setting up a separate cutting device, not only are costs and equipment complexity reduced, but the application scenarios of the roll changing device are also broadened. Finally, by controlling the roll changing device to pull the battery strip at a fixed speed, compared to using a variable speed, the possibility of collision between the roll changing device and the unwinding roller is reduced, thereby reducing the possibility of strip powder shedding. This improves both the performance of the strip and the accuracy of the die-cutting machine, meeting the needs of high-timeliness and high-efficiency production.

[0041] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0042] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the specification, serve to illustrate the technical solutions of this disclosure.

[0043] Figure 1 A schematic diagram of the implementation process of a battery strip rewinding method provided in this embodiment of the present disclosure. Figure 1 ;

[0044] Figure 2 A schematic diagram of the composition structure of a battery strip changing device provided in this embodiment of the disclosure. Figure 1 ;

[0045] Figure 3 A schematic diagram of the composition structure of a battery strip changing device provided in this embodiment of the disclosure. Figure 2 ;

[0046] Figure 4 A schematic diagram of the composition structure of a battery strip changing device provided in this embodiment of the disclosure. Figure 3 ;

[0047] Figure 5 A schematic diagram of the implementation process of a battery strip rewinding method provided in this embodiment of the present disclosure. Figure 2 ;

[0048] Figure 6 A schematic diagram of the composition structure of a die-cutting machine provided in this embodiment of the present disclosure. Figure 1 ;

[0049] Figure 7 A schematic diagram of the composition structure of a die-cutting machine provided in this embodiment of the present disclosure. Figure 2 . Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this disclosure clearer, the disclosure will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this disclosure. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0051] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0052] In the following description, the terms “first, second, third” are used merely to distinguish similar objects and do not represent a specific ordering of objects. It is understood that “first, second, third” may be interchanged in a specific order or sequence where permitted, so that the embodiments of this disclosure described herein can be implemented in an order other than that illustrated or described herein.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing embodiments of this disclosure only and is not intended to be limiting of this disclosure.

[0054] In related technologies, power batteries are widely used in energy storage systems, electric vehicles, military equipment, and aerospace, among other fields. Power batteries can be individual cells, battery modules, or battery packs. The electrode strip (e.g., the electrode sheet) is a major component of a single battery cell, directly determining its electrochemical performance and safety. The electrode sheet consists of a metal current collector and a uniform coating applied to the metal current collector. During manufacturing, the electrode sheets are transported in rolls for coating, rolling, and slitting processes.

[0055] Currently, the production equipment for the upstream processes of battery cells (e.g., die-cutting machines, coating equipment, cold pressing equipment) all adopt a "roll-to-roll" unwinding and winding structure. During the automatic roll-changing process in the die-cutting machine, torque control is typically used. A roll-changing device (e.g., a rocker arm shaft) engages the electrode sheets on the unwinding shaft with the electrode sheets on the new unwinding shaft to achieve automatic roll changing. This process makes it easy for the roll-changing device and the unwinding shaft to collide, causing electrode powder to fall off and affecting the coaxiality and tightness of the roll-changing shafts in the die-cutting machine, thus impacting the accuracy of the die-cutting machine's operation.

[0056] This disclosure provides a battery electrode sheet rewinding device. First, the rewinding is automatically performed by the rewinding device, which reduces labor costs and improves efficiency and automation compared to manual rewinding. Second, by integrating the cutting function into the rewinding device, compared to setting up a separate cutting device, not only are costs and equipment complexity reduced, but the application scenarios of the rewinding device are also broadened. Finally, by controlling the rewinding device to pull the battery strip at a fixed speed, compared to using a variable speed, the possibility of collision between the rewinding device and the unwinding roller is reduced, thereby reducing the possibility of strip powder shedding. This improves the performance of the strip and the accuracy of the die-cutting machine, meeting the needs of high-efficiency and high-timeliness production. The method provided in this disclosure can be executed by a computer device, which can be any suitable device with data processing capabilities. Understandably, in industrial production, "computer equipment" can refer to both host computers (such as servers, laptops, tablets, desktop computers, and smartphones) and slave computers (such as industrial PCs, programmable logic controllers (PLCs), and tape changing equipment). This tape changing equipment can be any suitable type and application for changing tape. For example, in battery manufacturing, this tape changing equipment could be used for the die-cutting process.

[0057] The technical solutions in the embodiments of this disclosure will now be clearly and completely described with reference to the accompanying drawings.

[0058] Figure 1 A schematic diagram of the implementation process of a battery strip rewinding method provided in this embodiment of the present disclosure. Figure 1 ,like Figure 1 As shown, the roll changing method includes steps S11 to S12, wherein:

[0059] Step S11: In response to receiving the roll change signal, control the roll change device to pull the tail end of the battery strip on the first unwinding roller and engage the head end of the battery strip on the second unwinding roller at a fixed speed; wherein, the first unwinding roller is used to unwind the battery strip, and the second unwinding roller is used to unwind the spare battery strip.

[0060] Here, the roll change signal can be any suitable signal. In implementation, this roll change signal can be sent by a second detection device. The second detection device can be any suitable device, such as a camera, sensor, etc. In some embodiments, the camera can be deployed around the unwinding rollers (i.e., the first unwinding roller and the second unwinding roller), and the camera can capture images of the unwinding rollers. When the image of the unwinding roller indicates that the battery strip on it is about to be unwound, the roll change signal is generated and sent. In some embodiments, the sensor can be deployed on the unwinding rollers, and the sensor can measure the feed length of the battery strip on the unwinding rollers or the roll diameter of the unwinding rollers. When the feed length or roll diameter meets preset conditions, the roll change signal is generated and sent.

[0061] The roll changing device can be any suitable device capable of performing the roll changing function, such as a shaft or roller.

[0062] A fixed motion speed represents an approximately constant speed. In practice, this fixed motion speed v can be a speed with a deviation within a threshold σ, i.e., v∈[v1-σ,v1+σ], where σ is small, such as 1, 0.5, etc., and v1 is a constant speed. In some embodiments, this fixed motion speed can be determined based on the properties of the material strip, the size of the rewinding device, etc. The properties of the material strip can include, but are not limited to, material, thickness, and process.

[0063] The battery strip can be any suitable strip, such as an electrode sheet.

[0064] The first unwinding roll refers to the unwinding roll that is currently unwinding, and the second unwinding roll refers to the spare unwinding roll. In practice, the first unwinding roll and the second unwinding roll can be interchanged. After the first unwinding roll has finished unwinding, the second unwinding roll is used as the new first unwinding roll, and the first unwinding roll is used as the new second unwinding roll.

[0065] In some embodiments, step S11 includes step S111, wherein:

[0066] Step S111: In response to receiving the roll change signal sent by the second detection device, a control command is sent to the drive device so that the drive device, based on the control command, drives the roll change device to pull the tail of the battery material strip on the first unwinding roller and engage the head of the battery material strip on the second unwinding roller at the fixed motion speed.

[0067] Here, the second detection device can be any suitable device capable of performing detection functions, such as a camera or sensor. In implementation, when the second detection device detects that the material strip on the first unwinding roller is about to be unwound completely, it generates and sends the roll change signal.

[0068] The driving device can be any suitable device capable of performing the driving function, such as an electric motor.

[0069] The control command can be any suitable command. When implemented, the control command is used to control the operation of the drive device so that the drive device drives the roll changing device to move.

[0070] In this way, on the one hand, the accuracy of control is improved by controlling the drive device through control commands; on the other hand, by driving the change device to pull the first unwinding roller at a fixed speed, the possibility of collision between the change device and the unwinding roller is reduced compared to the variable speed, thereby improving the quality and performance of the battery strip.

[0071] In some embodiments, the control command includes a first control command and a second control command; step S111 includes steps S1111 to S1112, wherein:

[0072] Step S1111: In response to receiving the roll change signal sent by the second detection device, the first control command is sent to the drive device, so that the drive device drives the roll change device to pull the tail of the battery material strip on the first unwinding roller to a first position according to the first control mode based on the first control command; wherein, the movement speed in the first control mode is a variable movement speed.

[0073] Here, different control commands can be used to select different control modes (including a first control mode and a second control mode). The first / second control command may or may not include the corresponding control mode. In implementation, if the first / second control command includes the corresponding control mode, parsing the first / second control command will yield the corresponding control mode; if the first / second control command does not include the corresponding control mode, different commands or different identifiers can be used to obtain the corresponding control mode. For example, parsing the mode field in the first / second control command will yield the corresponding control mode; for instance, 1 represents the first control mode and 0 represents the second control mode.

[0074] The control mode (including the first control mode and the second control mode) can be any suitable mode, such as position control mode, torque control mode, etc. In implementation, this control mode includes motion speed, torque, etc. The first control mode can be the position control mode, that is, both motion speed and torque are gradually increased.

[0075] The first position can be any suitable position. In practice, the first position can be a position close to the second position. The second position refers to the corresponding pasting position on the second unwinding reel. In practice, both the first and second positions are located in the second direction. The second direction can be any suitable direction, such as the X-axis or Y-axis in a Cartesian coordinate system.

[0076] Step S1112: In response to determining the target position, a second control command is sent to the drive device, so that the drive device, based on the second control command and in accordance with the second control mode, drives the winding device to pull the tail of the battery material strip on the first unwinding roller from the first position to the second position; wherein, the movement speed in the second control mode is the fixed movement speed.

[0077] Here, the target position represents the position where the cutter extends. In implementation, the rewinding device includes a cutter located on the rewinding pressure roller, which rotates to drive the cutter to rotate. In some embodiments, the straight line formed between the target position and the second position has a preset angle with the second direction, for example, 5 degrees. In some embodiments, the target position can be determined by a first detection device, which can be any suitable device, such as a camera or sensor. The first detection device is connected to the rewinding pressure roller and detects the values ​​of various points on the disk at the end of the rewinding pressure roller. The detection values ​​are different for non-target positions and target positions. In implementation, the detection position of the first detection device is fixed. During the rotation of the rewinding pressure roller, the first detection device can detect various points on the disk. When the detected position is the target position (i.e., the detection value is the set value), the rewinding pressure roller can be fixed so that it stops rotating, and the battery material strip on the first unwinding roller is moved to the second position at a fixed speed.

[0078] The second control command may or may not include the second control mode. The second control mode may be torque limiting under position control mode, that is, the torque increases gradually while the movement speed is constant.

[0079] The second position refers to the corresponding pasting position on the second unrolling spool.

[0080] In this embodiment, firstly, by employing different control commands at different stages, the accuracy of the winding device operation is improved; secondly, in the first stage, a variable speed is used to quickly move to the first position, which shortens the movement time and improves the winding efficiency compared to using a fixed speed; finally, in the second stage, a fixed speed is used to move to the second position, which reduces the possibility of collision between the winding device and the unwinding roller compared to using a variable speed, thereby improving the quality and performance of the battery strip.

[0081] Step S12: Control the winding device to cut the battery material strip on the first unwinding roller.

[0082] Here, the rewinding device includes a cutting device, such as a cutter, which cuts the battery strip on the first unwinding roller to complete the automatic rewinding.

[0083] In some embodiments, step S12 includes steps S121 to S122, wherein:

[0084] Step S121: Control the cutter on the roll changing device to extend.

[0085] Here, the rewinding device may include a rewinding pressure roller and a cutter located on the rewinding pressure roller. In implementation, the rewinding pressure roller drives the cutter to rotate. In some embodiments, after determining the cutter's extension position (i.e., the target position), the rewinding pressure roller is fixed to stop rotating, thereby fixing the target position. When the rewinding pressure roller pulls the battery strip on the first unwinding shaft to engage with the battery strip on the second unwinding shaft, the cutter is controlled to extend. In some embodiments, a corresponding extension control command can be sent to the rewinding device, causing the rewinding device to extend the cutter on the rewinding pressure roller based on the extension control command. In this way, by integrating the cutter into the rewinding device, compared to setting up a separate cutter, not only are costs and equipment complexity reduced, but the application scenarios of the rewinding device are also broadened.

[0086] Step S122: Control the cutter to cut the battery material strip on the first unwinding roller.

[0087] Here, a corresponding cutting control command can be sent to the rewinding device, so that the rewinding device cuts the battery strip based on the cutting control command. Alternatively, a corresponding motion control command can be sent to the drive device, so that the drive device drives the rewinding device to move, thereby driving the cutter to cut the battery strip.

[0088] In this embodiment, firstly, automatic roll changing is performed by a roll changing device, which reduces labor costs and improves efficiency and automation compared to manual roll changing. Secondly, by integrating the cutting function into the roll changing device, compared to setting up a separate cutting device, not only are costs and equipment complexity reduced, but the application scenarios of the roll changing device are also broadened. Finally, by controlling the roll changing device to move the battery strip at a fixed speed, compared to using a variable speed, the possibility of collision between the roll changing device and the unwinding roller is reduced, thereby reducing the possibility of strip powder shedding. This improves the performance of the strip while also enhancing the accuracy of the die-cutting machine, meeting the needs of high-timeliness and high-efficiency production.

[0089] Based on the above embodiments, this disclosure also provides a battery strip changing device. Figure 2 A schematic diagram of the composition structure of a battery strip changing device provided in this embodiment of the disclosure. Figure 1 ,like Figure 2 As shown, the winding changer 20 includes a first unwinding roller 21, a second unwinding roller 22, a winding changer 23, and a control device 24, wherein:

[0090] The first unwinding roller 21 is used to unwind the battery strip;

[0091] The second unwinding roller 22 is used to unwind the spare battery material strip;

[0092] The winding device 23 is used to pull the material strip of the first unwinding roller to move;

[0093] The control device 24 is configured to, in response to receiving a roll change signal, control the roll change device to pull the tail end of the battery strip on the first unwinding roller and engage the head end of the battery strip on the second unwinding roller at a fixed speed, and control the roll change device to cut the battery strip on the first unwinding roller.

[0094] Here, the first unwinding roll 21 refers to the unwinding roll that is currently unwinding, and the second unwinding roll 22 refers to the spare unwinding roll. In practice, the first unwinding roll 21 and the second unwinding roll 22 can be interchanged. After the first unwinding roll 21 has finished unwinding, the second unwinding roll 22 is used as the new first unwinding roll, and the first unwinding roll is used as the new second unwinding roll.

[0095] The roll changing device can be any suitable device capable of performing the roll changing function, such as a shaft or roller.

[0096] The roll change signal can be sent by a second detection device, which can be a camera, sensor, etc. In practice, when the second detection device detects that the battery material strip on the first unwinding roller is about to be unwound completely, it generates and sends the unwinding signal to the control device.

[0097] The control device can be any suitable device capable of performing control functions, such as a PLC.

[0098] In some embodiments, the rewinding device includes a rewinding pressure roller and a cutter located on the rewinding pressure roller; the control device is further configured to, in response to receiving the rewinding signal, control the rewinding pressure roller to pull the tail end of the battery strip on the first unwinding roller to engage the head end of the battery strip on the second unwinding roller at the fixed motion speed; and control the cutter to extend to cut the battery strip on the first unwinding roller.

[0099] Here, the rewinding pressure roller drives the cutter to rotate. In implementation, after determining the cutter position, the rewinding pressure roller can be fixed to prevent further rotation, thus fixing the cutter position. In some embodiments, the control device can send an extension control command to the rewinding device, which, based on the extension control command, drives the cutter to extend from the rewinding pressure roller. In some embodiments, after cutting the battery strip on the first unwinding roller, it is necessary to control the cutter to retract into the rewinding pressure roller. In implementation, the cutter is defaulted to being in the unwinding pressure roller. Thus, by integrating the cutter into the rewinding device, compared to setting up a separate cutter, not only are costs and equipment complexity reduced, but the application scenarios of the rewinding device are also broadened.

[0100] In some embodiments, the control device 24 is further configured to: in response to receiving the roll change signal, control the roll change device to move the tail of the battery strip on the first unwinding roller to a first position according to a first control mode; wherein the movement speed in the first control mode is a variable movement speed; in response to determining a target position, control the roll change device to move the tail of the battery strip on the first unwinding roller from the first position to a second position according to a second control mode, such that the tail of the battery strip on the first unwinding roller engages with the head of the battery strip on the second unwinding roller; wherein the movement speed in the second control mode is the fixed movement speed; and control the roll change device to cut the battery strip on the first unwinding roller based on the target position.

[0101] Here, the first control mode differs from the second control mode. For example, the first control mode could be a position control mode, and the second control mode could be torque limiting within the position control mode. In implementation, each control mode can include, but is not limited to, motion speed, torque, etc.

[0102] The first and second positions are quite close, with the second position referring to the corresponding pasting position on the second unwinding reel. In practice, both the first and second positions are located in the second direction. This second direction can be the X-axis in a Cartesian coordinate system.

[0103] In this way, firstly, by using different control modes in different stages, the accuracy of the winding device operation is improved; secondly, in the first stage, using a variable speed to quickly move to the first position shortens the movement time and improves the winding efficiency compared to using a fixed speed; finally, in the second stage, using a fixed speed to move to the second position reduces the possibility of collision between the winding device and the unwinding roller compared to using a variable speed, thereby improving the quality and performance of the battery strip.

[0104] In some embodiments, the control device 24 is further configured to: determine the target position based on the detection information from the first detection device.

[0105] Here, the first detection device can be any suitable device capable of performing detection functions, such as a camera or sensor. In implementation, this first detection device is connected to the rewinding pressure roller and is used to acquire detection values ​​at various points on the disc at the end of the rewinding pressure roller. There may be a notch or break at the cutter extension position (i.e., the target position) on this disc. By detecting each point on this disc, the cutter extension position can be obtained. For example, during the rotation of the disc, the first detection device collects data at each point it passes through. If the detection value at a point meets preset conditions, such as being 0 or having an empty value, then that point is taken as the target position. In this way, by automatically identifying the target position in the rewinding device, the accuracy of the target position is improved, and the automation level of the equipment is enhanced.

[0106] In some embodiments, the roll changing device 20 further includes a drive device connected to the roll changing device 23; the control device is further configured to send a first control command to the drive device in response to receiving the roll changing signal; the drive device is configured to receive the first control command and drive the roll changing device to move the tail end of the battery material strip on the first unwinding roller to the first position according to the first control mode.

[0107] Here, the driving device can be any suitable device capable of performing the driving function, such as a motor.

[0108] Different control commands can be used to select different control modes (including a first control mode and a second control mode). In implementation, the first / second control command may or may not include the corresponding control mode.

[0109] The first control mode may include, but is not limited to, motion speed, torque, etc. In implementation, this first control mode may be a position control mode.

[0110] In this way, on the one hand, the accuracy of control is improved by controlling the drive device through the first control command; on the other hand, the drive device drives the changing device to pull the first unwinding roller to the first position according to the changing speed, which shortens the movement time and improves the changing efficiency compared to a constant speed.

[0111] In some embodiments, the driving device is further configured to: drive the winding device to rotate from an initial position to a preset position; drive the winding device to move along a first direction from the preset position to a third position, so that the winding device passes through the battery strip on the first unwinding roller; and, according to the first control mode, drive the winding device to pull the tail of the battery strip on the first unwinding roller to the first position along a second direction; wherein the second direction is perpendicular to the first direction.

[0112] Here, the initial position refers to the starting position of the roll changing device. The preset position is at a certain angle to the initial position, for example, 90 degrees. In practice, the roll changing device is controlled to rotate 90 degrees from the initial position to the preset position.

[0113] The first direction can be any suitable direction, and it is perpendicular to the second direction. For example, if the second direction is the X-axis in a Cartesian coordinate system, then the first direction can be the Y-axis in a Cartesian coordinate system. In some embodiments, the second direction is perpendicular to the plane, and the first direction is parallel to the plane.

[0114] The third position can be any suitable position, and this third position, along with the first and second positions, is located in the second direction. In implementation, the third position can serve as the starting point for the winding device to operate in the second direction, and the second position can serve as the ending point for the winding device to operate in the second direction.

[0115] In some implementations, during the process of driving the roll changing device, the drive device can be controlled by the control device sending different control commands to control the drive device to drive the roll changing device to move, or it can be achieved by the control device sending a single control command.

[0116] In this way, on the one hand, the drive device drives the roll changing device to move from the initial position to the third position so as to accurately pass through the battery material strip on the first unwinding roller; on the other hand, the drive device drives the roll changing device to pull the first unwinding roller to the first position according to the varying speed, which shortens the movement time and improves the roll changing efficiency compared to a constant speed.

[0117] In some embodiments, the control device is further configured to send a second control command to the drive device in response to determining the target position; the drive device is further configured to receive the second control command and, according to the second control mode, drive the winding device to pull the tail of the battery material strip on the first unwinding roller from the first position to the second position.

[0118] Here, the target position represents the position where the cutter extends. In some embodiments, the straight line formed between the target position and the second position has a preset angle with the second direction, for example, 10 degrees. The second control command may or may not include the second control mode. If the second control command does not include the second control mode, the control mode can be determined by a specified field in the second control command. For example, if the specified field is 1, it indicates that the control mode is the second control mode; if the specified field is 0, it indicates that the control mode is the first control mode.

[0119] Figure 3 A schematic diagram of the composition structure of a battery strip changing device provided in this embodiment of the disclosure. Figure 2 ,like Figure 3 As shown, the rewinding device 20 includes a first unwinding roller 21, a second unwinding roller 22, and a rewinding device 23. The rewinding device 23 includes a rewinding pressure roller 231 and a cutter 232 located on the rewinding pressure roller 231, wherein:

[0120] The changing pressure roller 231 moves from a preset position to a third position along the first direction Y to pass through the material strip 211 on the first unwinding roller 21;

[0121] According to the first control mode, the changing pressure roller 231 moves from the third position to the first position along the second direction X;

[0122] The position of the cutter 232 is determined from the disc at the end of the rewinding pressure roller 231, and the rewinding pressure roller 231 is locked and no longer rotated;

[0123] According to the second control mode, the changing pressure roller 231 moves from the first position 283 to the second position 284 along the second direction X to achieve the engagement of the material strip 211 on the first unwinding roller 21 and the material strip 221 on the second unwinding roller 22.

[0124] The cutter 232 extends from the changing pressure roller 231 and cuts the material strip 211 on the first unwinding roller 21 to achieve automatic roll changing.

[0125] In this way, on the one hand, the control accuracy is improved by controlling the drive device through the second control command; on the other hand, by driving the change device to pull the first unwinding roller to the second position at a fixed speed, the possibility of collision between the change device and the unwinding roller is reduced compared to the variable speed, thereby improving the quality and performance of the battery strip.

[0126] Figure 4 A schematic diagram of the composition structure of a battery strip changing device provided in this embodiment of the disclosure. Figure 3 ,like Figure 4 As shown, the rewinding device 20 includes a first unwinding roller 21, a second unwinding roller 22, a rewinding device 23, a control device 24, a drive device 25, a first detection device 26, and a second detection device 27. The rewinding device 23 includes a rewinding pressure roller 231 and a cutter 232, wherein:

[0127] After receiving the roll change signal from the second detection device 27, the control device 24 sends a first control command to the drive device 25;

[0128] After receiving the first control command, the drive device 25 drives the rewinding pressure roller 231 to rotate from the initial position to the preset position; drives the rewinding pressure roller 231 to move from the preset position to the third position along the first direction to pass through the battery material strip on the first unwinding roller 21; according to the first control mode, drives the rewinding pressure roller 231 to pull the tail of the battery material strip of the first unwinding roller 21 along the second direction to the first position.

[0129] The control device 24 sends a collection command to the first detection device 26, so that the first detection device 26 can collect the detection values ​​of each point on the disc at the end of the roll changing pressure roller 231 in real time based on the collection command, and determine the cutter position (i.e., the target position) based on the detection values ​​of each point.

[0130] The control device 24 sends a third control command to the drive device 25; wherein the third control command is used to fix the position of the cutter.

[0131] After receiving the third control command, the drive unit 25 fixes the roll changing pressure roller 231 to fix the position of the cutter.

[0132] Control device 24 sends a second control command to drive device 25;

[0133] After receiving the second control command, the drive device 25 drives the changing pressure roller 231 to pull the battery strip of the first unwinding roller 21 from the first position to the second position according to the second control mode, so as to realize the engagement of the tail of the battery strip on the first unwinding roller 21 with the head of the battery strip on the second unwinding roller 22.

[0134] The control device 24 sends a fourth control command to the drive device 25; wherein the fourth control command is used to control the extension of the cutter 232;

[0135] After receiving the fourth control command, the drive unit 25 controls the cutter 232 to extend from the rewinding pressure roller 231 to cut the battery strip on the first unwinding roller 21, thereby realizing automatic rewinding of the battery strip.

[0136] Figure 5 A schematic diagram of the implementation process of a battery strip rewinding method provided in this embodiment of the present disclosure. Figure 2 ,like Figure 5 As shown, the roll changing method includes steps S210 to S221, wherein:

[0137] In step S210, the PLC (corresponding to the aforementioned control device) receives the first unwinding roller change signal sent by the second detection device and sends a first control command to the motor (corresponding to the aforementioned drive device);

[0138] Step S211: Based on the first control command, the motor drives the swing arm shaft (corresponding to the aforementioned roll changing pressure roller) to rotate from the initial position to the preset position;

[0139] Step S212: The motor drives the rocker arm shaft to move from a preset position to a third position along the first direction, so that the rocker arm shaft passes through the material strip on the first unwinding roller;

[0140] Step S213: According to the position control mode (corresponding to the aforementioned first control mode), the motor drives the rocker arm shaft to move from the third position to the first position along the second direction;

[0141] Step S214: The PLC sends a data acquisition command to the first detection device;

[0142] Step S215: Based on the acquisition command, the first detection device determines the cutter position from various points on the disk at the end of the swing arm shaft;

[0143] Step S216: The PLC sends a third control command to the motor;

[0144] Here, the third control command is used to fix the position of the cutter.

[0145] Step S217: Based on the third control command, the motor fixes the position of the cutter on the disc at the end of the rocker arm shaft;

[0146] Step S218: The PLC sends a second control command to the motor;

[0147] Step S219: Based on the second control command, the motor drives the rocker arm shaft to move from the first position to the second position along the second direction according to the torque limit in the position control mode (corresponding to the aforementioned second control), so as to engage the tail of the strip on the first unwinding roller with the head of the strip on the second unwinding roller.

[0148] Step S220: The cutter on the swing arm shaft is extended by the motor to cut the strip on the first unwinding roller;

[0149] Step S221: The motor drives the rocker arm shaft back to its initial position.

[0150] In this embodiment, firstly, automatic roll changing is performed by a roll changing device, which reduces labor costs and improves efficiency and automation compared to manual roll changing. Secondly, by integrating the cutting function into the roll changing device, compared to setting up a separate cutting device, not only are costs and equipment complexity reduced, but the application scenarios of the roll changing device are also broadened. Finally, by controlling the roll changing device to move the battery strip at a fixed speed, compared to using a variable speed, the possibility of collision between the roll changing device and the unwinding roller is reduced, thereby reducing the possibility of strip powder shedding. This improves the performance of the strip while also enhancing the accuracy of the die-cutting machine, meeting the needs of high-timeliness and high-efficiency production.

[0151] Based on the above embodiments, this disclosure also provides a die-cutting machine. Figure 6 A schematic diagram of the composition structure of a die-cutting machine provided in this embodiment of the present disclosure. Figure 1 ,like Figure 6 As shown, the die-cutting machine 30 includes an unwinding mechanism 31, a cutting mechanism 32, and a winding mechanism 33 arranged sequentially along the conveying direction of the battery material strip, wherein:

[0152] The unwinding mechanism 31 includes the rewinding device described in any of the above-mentioned embodiments, and is used to release the battery material strip;

[0153] The cutting mechanism 32 is used to cut the battery strip to form tabs;

[0154] The winding mechanism 33 is used to wind up the slit battery strip.

[0155] Here, the cutting mechanism 32 can be any suitable mechanism capable of performing the cutting function. In some embodiments, the cutting mechanism 32 includes multiple cutting elements, with different cutting elements used to cut different areas of the strip. For example, two cutting elements are used to cut the blank areas at the two edges of the strip to form tabs, and one cutting element is used to cut the blank area in the middle of the strip to form tabs. The cutting elements may include, but are not limited to, cutters, cutting heads, etc.

[0156] The winding mechanism 33 can be any suitable mechanism capable of performing the winding function. In some embodiments, the number of winding mechanisms 33 can be at least one. In some embodiments, the number of winding mechanisms 33 matches the number of strips cut, with each winding mechanism 33 used to wind up a corresponding strip.

[0157] In some embodiments, the winding mechanism 33 includes a winding roller, a spare winding roller, and a tape-attaching device. The tape-attaching device is used to cut the unwound tape and wind it onto the spare winding roller after the winding roller has finished winding. In this way, automatic winding and tape-attaching are achieved through the tape-attaching device, which improves the winding efficiency and thus enhances the working efficiency of the die-cutting machine.

[0158] In some embodiments, the die-cutting machine further includes at least one of the following: a slitting mechanism, a third detection device, a marking mechanism, a dust removal mechanism, a deviation correction mechanism, and a tension adjustment mechanism, wherein:

[0159] The slitting mechanism is located between the cutting mechanism and the winding mechanism and is used to slitting the battery material strip;

[0160] The third detection device, located in the unwinding mechanism and / or in the slitting mechanism, is used to acquire images of the battery strip; based on the images of the battery strip, to determine the detection result of the battery strip; wherein the detection result indicates whether the battery strip has defects;

[0161] The marking mechanism is located in the cutting mechanism and / or between the slitting mechanism and the winding mechanism, and is used to mark the battery strip when the inspection results indicate that there are defects in the battery strip;

[0162] The dust removal mechanism is located between the cutting mechanism and the slitting mechanism, and / or between the slitting mechanism and the winding mechanism, and is used to remove dust from the battery strip after cutting.

[0163] The correction mechanism is located between the unwinding mechanism and the cutting mechanism, and / or between the cutting mechanism and the slitting mechanism, and is used to correct the deviation of the battery strip.

[0164] The tension adjustment mechanism is located between the slitting mechanism and the winding mechanism, and is used to adjust the winding tension of the winding mechanism.

[0165] Here, the slitting mechanism can be any suitable mechanism capable of performing the slitting function. The number of slitting mechanisms can be at least one. In some embodiments, the number of slitting mechanisms matches the number of conveyor belts, with each slitting mechanism used to slit the corresponding conveyor belt. In some embodiments, the slitting mechanism may include, but is not limited to, a slitting frame and at least one cutter located on the slitting frame, with the cutters spaced apart along the width of the conveyor belt, allowing the conveyor belt to be slit into at least two strips.

[0166] The third detection device can be any suitable device, such as a sensor or camera. The detection results can include, but are not limited to, results indicating the presence of defects or the absence of defects. Defects in the battery strip can be any suitable defect, such as metal leakage in the film area, dark spots, dark marks, cracks, etc. Other examples include excess / damaged / folded tabs, yellow labels, excess / damaged straight edges, and splicing.

[0167] The number of the third inspection device can be at least one. In some embodiments, the third inspection device is deployed in the unwinding mechanism, mainly for detecting defects in the quality of the strip, such as metal leakage, dark spots, dark marks, cracks, etc. The third inspection device may include two cameras, which respectively inspect the A / B sides (i.e., the front and back sides) of the strip for defects.

[0168] In some implementations, a third inspection device is deployed in the slitting mechanism, primarily for detecting other defects in the strip, such as excess / damaged / folded tabs, excess / damaged straight edges, and splicing. This third inspection device includes multiple cameras, using different cameras to detect different defects, thus improving the accuracy and specificity of the inspection results.

[0169] In this way, by deploying different detection devices in different locations to detect different defects in the battery strip, the comprehensiveness and accuracy of the detection are improved, thereby enhancing the quality and stability of the resulting batteries.

[0170] The marking mechanism can be any suitable mechanism capable of marking the material strip, such as a laser marking machine, color marking machine, pattern marking machine, etc. The number of marking mechanisms can be at least one. In some embodiments, the marking mechanism is located within the cutting mechanism and is used to mark the battery material strip if the quality inspection results indicate defects. In some embodiments, the marking mechanism is located between the slitting mechanism and the winding mechanism and is used to mark the battery material strip if the inspection results of the cut material strip indicate defects.

[0171] The dust removal mechanism can be any suitable mechanism capable of performing dust removal, such as a blower or a brush. In some embodiments, there can be at least one dust removal mechanism; for example, one dust removal mechanism can be deployed on each of the A and B sides of the material strip. This reduces the possibility of dust contamination on the material strip leading to poor battery performance.

[0172] The correction mechanism can be any suitable mechanism capable of performing correction functions. In some embodiments, the correction mechanism may include, but is not limited to, correction components, data acquisition components, etc. The data acquisition components may include, but are not limited to, cameras, rangefinders, etc., used to compare the acquired material strip information with standard information to determine whether the material strip has deviated. If a deviation exists, the correction component is controlled to move until the material strip information matches the standard information. In some embodiments, the number of correction mechanisms can be at least one. For example, the correction mechanism is located between the unwinding mechanism 31 and the cutting mechanism 32, used to correct the deviation of uncut material strip. Another example is that the correction mechanism is located between the cutting mechanism 32 and the slitting mechanism, used to correct the deviation of unslit material strip. In this way, by timely correcting the deviation of uncut material strip and / or unslit material strip, the possibility of uneven cutting and high scrap rate caused by material strip deviation is reduced.

[0173] The tension adjustment mechanism can be any suitable mechanism capable of tension adjustment. In some embodiments, the number of such tension adjustment mechanisms can be at least one. For example, the number of tension adjustment mechanisms may match the number of strips cut by the slitting mechanism. In this way, timely adjustment of the winding tension by the tension adjustment mechanism reduces the possibility of strip wrinkles, barrel bursts, and uneven winding.

[0174] Figure 7 A schematic diagram of the composition structure of a die-cutting machine provided in this embodiment of the present disclosure. Figure 2 ,like Figure 7 As shown, the die-cutting machine 30 includes an unwinding mechanism 31, a cutting mechanism 32, a slitting mechanism 34, a tension adjusting mechanism 35, and a winding mechanism 33 arranged sequentially along the conveying direction of the battery material strip. The die-cutting machine also includes a third detection device 36, a marking mechanism 37, a dust removal mechanism 38, and a deviation correction mechanism 39.

[0175] There are two third detection devices 36. One is located in the unwinding mechanism 31 and is used to detect the material strip to obtain the first detection result. The other is located in the slitting mechanism 34 and is used to detect the cut material strip to obtain the second detection result.

[0176] There are two marking mechanisms 37. One is located in the cutting mechanism 32 and is used to mark the strip with defects indicated by the first detection result. The other is located between the slitting mechanism 34 and the dust removal mechanism 38 and is used to mark the strip with defects indicated by the second detection result.

[0177] The dust removal mechanism 38 is located between the second marking mechanism 37 and the tension adjustment mechanism 35, and is used to remove dust from the slit strip.

[0178] There are two correction mechanisms 39. One is located between the unwinding mechanism 31 and the cutting mechanism 32, and is used to correct the deviation of the uncut strip. The other is located between the cutting mechanism 39 and the slitting mechanism 34, and is used to correct the deviation of the unslitting strip.

[0179] In this embodiment, firstly, automatic roll changing via a roll-changing device reduces labor costs and improves efficiency and automation compared to manual roll changing. Secondly, integrating the cutting function into the roll-changing device reduces costs and equipment complexity compared to a separate cutting device, and broadens the application scenarios of the roll-changing device. Thirdly, controlling the roll-changing device to move the battery strip at a fixed speed reduces the possibility of collision between the roll-changing device and the unwinding roller compared to using a variable speed, thereby reducing the possibility of strip powder shedding. This improves both the performance of the strip and the accuracy of the die-cutting machine, meeting the demands of high-efficiency and high-timeliness production. Finally, integrating different mechanisms into the die-cutting equipment enhances its versatility and adaptability, reducing battery production costs while improving production efficiency and quality.

[0180] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this disclosure. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this disclosure, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this disclosure. The sequence numbers of the above-described embodiments are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0181] In the several embodiments provided in this disclosure, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components may be combined, or integrated into another system, or some features may be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0182] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units; some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the embodiments of this disclosure, all functional units may be integrated into one processing unit, or each unit may be a separate unit, or two or more units may be integrated into one unit; the integrated unit may be implemented in hardware or in a combination of hardware and software functional units.

[0183] The above description is merely an embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A roll changing apparatus of a battery cell tape characterized by comprising: The application relates to a battery strip changing device. The battery strip changing device comprises: a first unwinding roller and a second unwinding roller, the first unwinding roller is used for unwinding a battery strip, and the second unwinding roller is used for unwinding a standby battery strip; a changing device used for pulling the battery strip of the first unwinding roller to move; a control device used for, in response to receiving a changing signal, controlling the changing device to pull the tail of the battery strip on the first unwinding roller to be jointed with the head of the battery strip on the second unwinding roller at a fixed movement speed and controlling the changing device to cut off the battery strip on the first unwinding roller; 2. The roll changing apparatus according to claim 1, characterized in that, the control device is further used for, in response to receiving the changing signal, controlling the changing device to pull the tail of the battery strip on the first unwinding roller to move to a first position in a first control mode; wherein the movement speed in the first control mode is a variable movement speed; and in response to determining a target position, controlling the changing device to pull the tail of the battery strip on the first unwinding roller to move from the first position to a second position in a second control mode, so that the tail of the battery strip on the first unwinding roller is jointed with the head of the battery strip on the second unwinding roller; wherein the movement speed in the second control mode is the fixed movement speed. The control device is further used for:

3. The roll changing apparatus according to claim 1, characterized in that, controlling the changing device to cut off the battery strip on the first unwinding roller based on the target position. The control device is further used for:

4. The change apparatus according to claim 1, characterized by determining the target position based on detection information of a first detection device. The battery strip changing device further comprises a driving device connected with the changing device; the control device is further used for, in response to receiving the changing signal, sending a first control instruction to the driving device; 5. The roll changing apparatus according to claim 4, characterized in that, the driving device is used for, in response to receiving the first control instruction, driving the changing device to pull the tail of the battery strip on the first unwinding roller to move to the first position in the first control mode. The driving device is further used for: driving the changing device to rotate from an initial position to a preset position; driving the changing device to move from the preset position to a third position in a first direction, so that the changing device penetrates through the battery strip on the first unwinding roller; 6. The roll changing apparatus according to claim 1, characterized by driving the changing device to pull the tail of the battery strip on the first unwinding roller to move to the first position in the second direction in the first control mode; wherein the second direction is perpendicular to the first direction. The battery strip changing device further comprises a driving device connected with the changing device; the control device is further used for, in response to determining the target position, sending a second control instruction to the driving device; 7. The change apparatus according to any one of claims 1 to 6, characterized by, the driving device is further used for, in response to receiving the second control instruction, driving the changing device to pull the tail of the battery strip on the first unwinding roller to move from the first position to the second position in the second control mode. The changing device comprises a changing pressure roller and a cutter on the changing pressure roller; The control device is further configured to, in response to receiving the roll changing signal, control the roll changing pressure roller to pull the tail of the battery strip on the first unwinding roller to engage with the head of the battery strip on the second unwinding roller at the fixed movement speed. The control device is further configured to control the cutter to extend to cut the battery strip on the first unwinding roller.

8. A method of changing a battery cell tape, characterized by, The roll changing method comprises: In response to receiving a roll changing signal, controlling a roll changing device to pull the tail of the battery strip on a first unwinding roller to engage with the head of the battery strip on a second unwinding roller at a fixed movement speed; wherein the first unwinding roller is configured to unwind the battery strip, and the second unwinding roller is configured to unwind a standby battery strip; Controlling the roll changing device to cut the battery strip on the first unwinding roller. The response to receiving the roll changing signal and controlling the roll changing device to pull the tail of the battery strip on the first unwinding roller to engage with the head of the battery strip on the second unwinding roller at the fixed movement speed comprises: In response to receiving the roll changing signal, controlling the roll changing device to pull the tail of the battery strip on the first unwinding roller to a first position at a first control mode; wherein the movement speed in the first control mode is a variable movement speed; In response to determining the target position, controlling the roll changing device to pull the tail of the battery strip on the first unwinding roller from the first position to a second position at a second control mode, so that the tail of the battery strip on the first unwinding roller engages with the head of the battery strip on the second unwinding roller; wherein the movement speed in the second control mode is the fixed movement speed.

9. The method of changing a roll according to claim 8, characterized in that, The response to receiving the roll changing signal and controlling the roll changing device to pull the tail of the battery strip on the first unwinding roller to engage with the head of the battery strip on the second unwinding roller at the fixed movement speed further comprises: In response to receiving the roll changing signal sent by the second detection device, sending a control instruction to the driving device, so that the driving device drives the roll changing device to pull the tail of the battery strip on the first unwinding roller to engage with the head of the battery strip on the second unwinding roller at the fixed movement speed based on the control instruction.

10. The method of changing a roll according to claim 9, characterized in that, The control instruction comprises a first control instruction and a second control instruction. The response to receiving the roll changing signal sent by the second detection device and sending a control instruction to the driving device to drive the roll changing device to pull the tail of the battery strip on the first unwinding roller to engage with the head of the battery strip on the second unwinding roller at the fixed movement speed comprises: In response to receiving the roll changing signal sent by the second detection device, sending the first control instruction to the driving device, so that the driving device drives the roll changing device to pull the tail of the battery strip on the first unwinding roller to a first position at a first control mode based on the first control instruction; wherein the movement speed in the first control mode is a variable movement speed; In response to determining the target position, the second control instruction is sent to the driving device, so that the driving device drives the battery strip changing device to move the tail of the battery strip on the first unwinding roller from the first position to a second position according to a second control mode based on the second control instruction; wherein the movement speed in the second control mode is the fixed movement speed.

11. The roll changing method according to any one of claims 8 to 10, characterized in that, The control of the battery strip changing device to cut off the battery strip on the first unwinding roller comprises: Controlling the cutter on the battery strip changing device to extend; Controlling the cutter to cut off the battery strip on the first unwinding roller.

12. A die cutting machine characterized by, The die cutting machine comprises an unwinding mechanism, a cutting mechanism, and a winding mechanism arranged in sequence along the conveying direction of the battery strip, wherein: The unwinding mechanism comprises the battery strip changing device according to any one of claims 1 to 7, and is used to release the battery strip; The cutting mechanism is used to cut the battery strip to form a tab; The winding mechanism is used to wind the battery strip.

13. The die cutting machine of claim 12, wherein, The winding mechanism comprises a winding roller, a standby winding roller, and a belt connecting device, wherein: The belt connecting device is used to cut off the unwound battery strip and wind it onto the standby winding roller after the winding of the winding roller is completed.

14. The die cutting machine according to claim 12 or 13, characterized in that The die cutting machine further comprises at least one of the following: a slitting mechanism, a third detection device, a marking mechanism, a dust removal mechanism, a deviation correction mechanism, and a tension adjustment mechanism, wherein: The slitting mechanism is located between the cutting mechanism and the winding mechanism, and is used to slit the battery strip; The third detection device is located in the unwinding mechanism and / or in the slitting mechanism, and is used to acquire an image of the battery strip; based on the image of the battery strip, a detection result of the battery strip is determined; wherein the detection result represents whether the battery strip has a defect; The marking mechanism is located in the cutting mechanism and / or between the slitting mechanism and the winding mechanism, and is used to mark the battery strip if the detection result represents that the battery strip has a defect; The dust removal mechanism is located between the cutting mechanism and the slitting mechanism and / or between the slitting mechanism and the winding mechanism, and is used to remove dust on the battery strip after cutting is completed; The deviation correction mechanism is located between the unwinding mechanism and the cutting mechanism and / or between the cutting mechanism and the slitting mechanism, and is used to correct the deviation of the battery strip; The tension adjustment mechanism is located between the slitting mechanism and the winding mechanism, and is used to adjust the winding tension of the winding mechanism.

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