Cylindrical battery cell leveling method and device, battery cell leveling equipment, medium and product
By determining multiple flattening positions based on the cell length and controlling the torque threshold during the flattening process of cylindrical cells, the problem of undervoltage or overvoltage of the cells is solved, and the cells are compacted and precisely flattened.
Patent Information
- Application Number
- CN202511787966.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-28
- Publication Date
- 2026-03-06
AI Technical Summary
Existing methods for flattening cylindrical cells only use set left and right flattening positions, which can lead to undervoltage or overvoltage in the cells.
The left pre-flattening position, right pre-flattening position, left flattening position, and right flattening position are determined according to the design length and actual length of the battery cell. The flattening block is controlled to move at a preset speed, and the pressing and holding processes are performed a preset number of times according to the torque threshold to ensure that the torque of the flattening block does not exceed the threshold.
This effectively avoids undervoltage or overvoltage of the battery cell, ensures that the tabs are pressed firmly without damaging the battery cell, and improves the efficiency and accuracy of flattening.
Smart Images
Figure CN121618010A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a method, apparatus, equipment, medium and product for flattening cylindrical battery cells. Background Technology
[0002] With the development of technology, energy storage systems that can improve the stability of power grid operation have emerged. Energy storage systems can charge during off-peak hours and discharge during peak hours, and can also smooth power fluctuations from wind and solar power, improving grid connection quality and ensuring stable grid operation. All-tab cylindrical batteries are essential in energy storage systems; therefore, researchers in the power grid field conduct research and development on all-tab cylindrical batteries. After the positive electrode, separator, and negative electrode are precisely wound into cylindrical cells using a winding machine, the tabs need to be pre-folded and smoothed, then flattened and welded to the combiner plate before being encapsulated to form the battery.
[0003] In existing technologies, cylindrical battery cells are typically flattened using a cell flattening device. The cylindrical battery cell is placed in the device, and left and right flattening positions are set. The left flattening block is moved to the left flattening position, while the right flattening block is moved to the right flattening position. The left and right flattening blocks press the flattened tabs firmly, thus achieving flattening.
[0004] In summary, the existing flattening method for cylindrical cells only uses set left and right flattening positions, which can lead to undervoltage or overvoltage in the cells. Summary of the Invention
[0005] The cylindrical battery cell flattening method, apparatus, battery cell flattening equipment, medium, and product provided in this application are intended to solve the problem of undervoltage or overvoltage of the battery cell caused by existing cylindrical battery cell flattening methods that only flatten the cells by setting left and right flattening positions.
[0006] In a first aspect, embodiments of this application provide a method for flattening a cylindrical battery cell, including:
[0007] Based on the obtained cell design length and actual cell length, determine the left pre-pressing position, right pre-pressing position, left pressing position, and right pressing position;
[0008] Control the left flat block to move from the preset left starting position to the left pre-flat position at a first preset speed, and control the right flat block to move from the preset right starting position to the right pre-flat position at the first preset speed;
[0009] Based on the torque threshold, the left flattening position, and the right flattening position, the left flattening block and the right flattening block are controlled to perform a preset number of flattening presses and pressure holding processes.
[0010] Control the left flat block to move to the preset left starting position, and control the right flat block to move to the preset right starting position.
[0011] In one possible implementation, determining the left pre-pressing position, right pre-pressing position, left pressing position, and right pressing position based on the obtained cell design length and actual cell length includes:
[0012] The sum of half the actual length of the battery cell and the preset first distance is used as the pre-sampling distance;
[0013] The position at the pre-sampling distance to the left of the preset cell center position is taken as the left pre-sampling position;
[0014] The position at the pre-sampling distance to the right of the preset cell center position is taken as the right pre-sampling position;
[0015] The difference between half the actual length of the battery cell and the preset second distance is taken as the flattening distance;
[0016] The position at the flattening distance to the left of the preset cell center position is taken as the left flattening position;
[0017] The position at the flattening distance to the right of the preset cell center position is taken as the right flattening position.
[0018] In one possible implementation, each time the left and right flat blocks are controlled to perform pressing and holding pressure processes, it includes:
[0019] Determine the holding time based on the current number of attempts;
[0020] According to the second preset speed, the left flat-striking block is controlled to move from the left pre-flat-striking position to the left flat-striking position, while the right flat-striking block is controlled to move from the right pre-flat-striking position to the right flat-striking position; the second preset speed is less than the first preset speed;
[0021] When any one of the multiple stopping conditions is detected, control the left and right flat blocks to stop moving;
[0022] After the specified pressure holding time, control the left flat block to move to the left pre-flat position, and control the right flat block to move to the right pre-flat position;
[0023] The plurality of stopping conditions include:
[0024] The torque applied to the left-hand flat block reaches the torque threshold.
[0025] The left-side flat block reaches the stated left-side flat position;
[0026] The torque applied to the right-hand flat block reaches the torque threshold.
[0027] The right-side flat block reaches the aforementioned right-side flat position.
[0028] In one possible implementation, the method further includes: the acceleration of the left flat block moving from the left pre-flat position to the left flat position, and the acceleration of the right flat block moving from the right pre-flat position to the right flat position are both preset values.
[0029] In one possible implementation, during the process of controlling the left and right flat blocks to perform a preset number of pressing and holding processes, the distance between the left and right flat blocks is obtained in real time.
[0030] The minimum value among all the spacing between the flattened blocks is taken as the target spacing;
[0031] If the target spacing does not fall within the preset spacing range, an alarm will be triggered.
[0032] In one possible implementation, before determining the left pre-flattening position, right pre-flattening position, left flattening position, and right flattening position based on the obtained cell design length and actual cell length, the method further includes:
[0033] Obtain torque calculation parameters, including lead screw lead, lead screw efficiency coefficient, lead screw friction coefficient, flattening block mass, and calibrated flattening pressure;
[0034] The torque threshold is calculated based on the torque calculation parameters and the preset torque calculation formula.
[0035] Secondly, embodiments of this application provide a flattening device for a cylindrical battery cell, comprising:
[0036] The processing module is used to determine the left pre-flat position, right pre-flat position, left flat position, and right flat position based on the obtained cell design length and actual cell length.
[0037] The control module is used for:
[0038] Control the left flat block to move from the preset left starting position to the left pre-flat position at a first preset speed, and control the right flat block to move from the preset right starting position to the right pre-flat position at the first preset speed;
[0039] Based on the torque threshold, the left flattening position, and the right flattening position, the left flattening block and the right flattening block are controlled to perform a preset number of flattening presses and pressure holding processes.
[0040] Control the left flat block to move to the preset left starting position, and control the right flat block to move to the preset right starting position.
[0041] Thirdly, embodiments of this application provide a battery cell flattening device, comprising:
[0042] Processor, memory, communication interface;
[0043] The memory is used to store the executable instructions of the processor;
[0044] The processor is configured to execute the flattening method of the cylindrical battery cell according to any one of the first aspects by executing the executable instructions.
[0045] Fourthly, embodiments of this application provide a readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the flattening method for cylindrical battery cells as described in any of the first aspects.
[0046] Fifthly, embodiments of this application provide a computer program product, including a computer program, which, when executed by a processor, is used to implement the flattening method for cylindrical battery cells as described in any of the first aspects.
[0047] The cylindrical battery cell flattening method, apparatus, device, medium, and product provided in this application, after determining the left pre-flattening position, right pre-flattening position, left flattening position, and right flattening position based on the obtained designed length and actual length of the battery cell, controls the left flattening block to move from a preset left starting position to the left pre-flattening position at a first preset speed, and controls the right flattening block to move from a preset right starting position to the right pre-flattening position at a first preset speed; then, based on the torque threshold, the left flattening position, and the right flattening position, controls the left and right flattening blocks to perform a preset number of flattening and holding processes; finally, controls the left flattening block to move to the preset left starting position, and controls the right flattening block to move to the preset right starting position. This solution, by performing pressing and holding based on the torque threshold and the calculated left and right flattening positions, effectively avoids undervoltage or overvoltage situations in the battery cell. Attached Figure Description
[0048] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0049] Figure 1 A schematic diagram showing the positions of the battery cell and the flattening block provided in this application;
[0050] Figure 2 A schematic flowchart of an embodiment of the flattening method for cylindrical battery cells provided in this application;
[0051] Figure 3 Location diagram provided for this application;
[0052] Figure 4 A schematic flowchart of Embodiment 2 of the method for flattening cylindrical battery cells provided in this application;
[0053] Figure 5 A schematic flowchart of Embodiment 3 of the method for flattening cylindrical battery cells provided in this application;
[0054] Figure 6 A schematic diagram of an embodiment of the flattening device for cylindrical battery cells provided in this application;
[0055] Figure 7 This is a structural schematic diagram of a battery cell flattening device provided in this application.
[0056] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0057] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0058] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0059] With the development of technology, energy storage systems that can improve the stability of power grid operation have emerged. These systems can charge during off-peak hours and discharge during peak hours, and can also smooth power fluctuations from wind and solar power, improving grid connection quality and ensuring stable grid operation. All-tab cylindrical batteries are essential in energy storage systems; therefore, researchers in the power grid sector conduct research and development on all-tab cylindrical batteries, focusing not only on battery materials and structures but also on battery manufacturing methods.
[0060] In the production process of a full-tab cylindrical battery, the positive electrode, separator, and negative electrode are precisely wound into a cylindrical cell using a winding machine. Then, the tabs are pre-folded and smoothed, flattened, welded to the busbar, and then welded into the casing to form the battery.
[0061] In existing technologies, cylindrical battery cells are typically flattened using a cell flattening device. The cylindrical battery cell is placed in the device, and left and right flattening positions are set. The left flattening block is moved to the left flattening position, while the right flattening block is moved to the right flattening position. The left and right flattening blocks press the flattened tabs firmly, thus achieving flattening.
[0062] For example, Figure 1 This is a schematic diagram showing the positions of the battery cell and the flattening block provided in this application, as shown below. Figure 1 As shown, the cylindrical battery cell is placed horizontally between the left and right flat blocks. The left flat block moves to the left and the right flat block moves to the right, pressing the tabs of the cylindrical battery cell tightly.
[0063] Because flattening is performed only by setting the left and right flattening positions, it can lead to undervoltage or overvoltage of the battery cells.
[0064] To address the problems existing in the prior art, the inventors, during their research on the flattening method for cylindrical battery cells, discovered that to avoid undervoltage or overvoltage situations, the left pre-flattening position, right pre-flattening position, left flattening position, and right flattening position can be determined by the designed length and actual length of the battery cell. After the left flattening block moves to the left pre-flattening position and the right flattening block moves to the pre-flattening position, the left and right flattening blocks are controlled to perform flattening and voltage holding processes based on the torque threshold, the left flattening position, and the right flattening position. This ensures that the torque of the flattening blocks does not exceed the torque threshold and that the flattening blocks do not exceed the flattening position, thus preventing undervoltage or overvoltage situations. Based on the above inventive concept, the cylindrical battery cell flattening scheme of this application was designed.
[0065] The following provides an example illustrating the application scenarios of the flattening method for cylindrical battery cells provided in this application.
[0066] For example, in this application scenario, the positive electrode, separator, and negative electrode are precisely wound into a cylindrical battery cell by a winding machine. After the tabs are pre-folded and smoothed, the cylindrical battery cell is placed horizontally between the left and right flattening blocks of the battery cell flattening device.
[0067] Workers will input the designed length and actual length of the cylindrical battery cells into the battery cell leveling equipment in advance. Therefore, the battery cell leveling equipment will determine the left pre-leveling position, right pre-leveling position, left leveling position, and right leveling position based on the designed length and actual length of the battery cell.
[0068] Then, control the left flat block to move from the preset left starting position to the left pre-flat position at the first preset speed, and control the right flat block to move from the preset right starting position to the right pre-flat position at the first preset speed.
[0069] It should be noted that the first preset speed can be 380mm / s, 400mm / s, 420mm / s, etc. The embodiments of this application do not limit the first preset speed, and it can be determined according to the actual situation.
[0070] Then, based on the torque threshold, the left flattening position, and the right flattening position, the left flattening block and the right flattening block are controlled to perform a preset number of flattening presses and pressure holding processes.
[0071] It should be noted that the preset number of flattening times can be 1, 2, 3, etc. This application embodiment does not limit the preset number of flattening times, which can be determined according to the actual situation.
[0072] Finally, control the left flattening block to move to the preset left starting position, and control the right flattening block to move to the preset right starting position to complete the flattening process of the cylindrical battery cell.
[0073] It should be noted that the above scenario is only an example of an application scenario provided by the embodiments of this application. The embodiments of this application do not limit the actual form of the various devices included in the scenario, nor do they limit the interaction method between devices. In the specific application of the solution, it can be set according to actual needs.
[0074] The technical solution of this application will now be described in detail through specific embodiments. It should be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.
[0075] Figure 2This is a flowchart illustrating an embodiment of the cylindrical battery cell flattening method provided in this application. The execution entity in this embodiment is a battery cell flattening device. This embodiment describes how the battery cell flattening device calculates the left pre-flattening position, right pre-flattening position, left flattening position, and right flattening position, and then combines this with a torque threshold to explain the flattening process of the cylindrical battery cell. The method in this embodiment can be implemented through software, hardware, or a combination of both. Figure 2 As shown, the flattening method for this cylindrical battery cell specifically includes the following steps:
[0076] S201: Based on the obtained cell design length and actual cell length, determine the left pre-flat position, right pre-flat position, left flat position, and right flat position.
[0077] In the battery production process, batteries of the same specification are produced in batches to improve production efficiency. Therefore, before flattening cylindrical cells, the designed length and actual length of the cells can be input into the cell flattening equipment for use during the flattening process.
[0078] In this step, the cell flattening device needs to determine the left pre-flattening position, right pre-flattening position, left flattening position, and right flattening position based on the cell's designed length and actual length in order to flatten the cell.
[0079] Specifically, half of the actual length of the battery cell and the preset first distance are used as the pre-shooting flat distance.
[0080] It should be noted that the preset first distance can be 1mm, 2mm, 3mm, 4mm, etc. This application embodiment does not limit the preset first distance, and it can be determined according to the actual situation.
[0081] The position at the pre-sampling distance to the left of the preset cell center position is defined as the left pre-sampling position. In other words, the distance between the left pre-sampling position and the preset cell center position is the pre-sampling distance, and the left pre-sampling position is located to the left of the preset cell center position.
[0082] The position at the pre-sampling distance to the right of the preset cell center position is defined as the right pre-sampling position. In other words, the distance between the right pre-sampling position and the preset cell center position is the pre-sampling distance, and the right pre-sampling position is located to the right of the preset cell center position.
[0083] The difference between half the actual length of the battery cell and the preset second distance is taken as the flattening distance.
[0084] It should be noted that the preset second distance can be 0.2mm, 0.3mm, 0.4mm, etc. The embodiments of this application do not limit the preset second distance, which can be determined according to the actual situation.
[0085] The position at the left-side flattening distance from the preset battery cell center position is defined as the left flattening position. In other words, the distance between the left flattening position and the preset battery cell center position is the flattening distance, and the left flattening position is located to the left of the preset battery cell center position.
[0086] The position at the right-side flattening distance from the preset battery cell center position is defined as the right flattening position. In other words, the distance between the right flattening position and the preset battery cell center position is the flattening distance, and the right flattening position is located to the right of the preset battery cell center position.
[0087] It should be noted that the preset cell center position is the center position of the cylindrical cell after it has been flattened under normal circumstances.
[0088] For example, in Figure 1 On this basis, Figure 3 The location diagram provided for this application, such as Figure 3 As shown, before flattening the cylindrical battery cell, the left flattening block is located at a preset left starting position, and the right flattening block is located at a preset right starting position. The distance between the left pre-flattening position and the preset center position of the battery cell is the pre-flattening distance, and the distance between the left pre-flattening position and the preset center position of the battery cell is the flattening distance. Both the left pre-flattening position and the left flattening position are located to the left of the preset center position of the battery cell. The distance between the right pre-flattening position and the preset center position of the battery cell is the pre-flattening distance, and the distance between the right flattening position and the preset center position of the battery cell is the flattening distance. Both the right pre-flattening position and the right flattening position are located to the right of the preset center position of the battery cell.
[0089] S202: Control the left flat block to move from the preset left starting position to the left pre-flat position at the first preset speed, and control the right flat block to move from the preset right starting position to the right pre-flat position at the first preset speed.
[0090] In this step, after the cell flattening device determines the left pre-flattening position, the right pre-flattening position, the left flattening position, and the right flattening position, in order to improve the flattening efficiency, the left flattening block is controlled to move from the preset left starting position to the left pre-flattening position at a first preset speed, and the right flattening block is controlled to move from the preset right starting position to the right pre-flattening position at a first preset speed.
[0091] S203: Based on the torque threshold, the left flattening position, and the right flattening position, control the left flattening block and the right flattening block to perform a preset number of flattening presses and pressure holding processes.
[0092] In this step, the cell flattening device controls the left flattening block to move to the left pre-flattening position, and the right flattening block to move to the right pre-flattening position. Based on the torque threshold, the left flattening position, and the right flattening position, the device controls the left and right flattening blocks to perform a preset number of flattening and pressure holding processes.
[0093] Specifically, the process of controlling the left and right flat blocks to perform pressing and holding pressure each time is as follows:
[0094] First, determine the holding time based on the current number of attempts. The cell flattening equipment stores the correspondence between the number of attempts and the holding time market, so the holding time corresponding to the current number of attempts can be determined.
[0095] For example, a pressure holding time of 0.5 seconds corresponds to 1 pressurization cycle; a pressure holding time of 0.2 seconds corresponds to 2 pressurization cycles; and a pressure holding time of 0.1 seconds corresponds to 3 pressurization cycles. This embodiment does not explicitly establish a direct correspondence between the number of pressurization cycles and the pressure holding time; this can be determined based on actual circumstances.
[0096] According to the second preset speed, control the left flat-striking block to move from the left pre-flat-striking position to the left flat-striking position, and at the same time control the right flat-striking block to move from the right pre-flat-striking position to the right flat-striking position.
[0097] It should be noted that the second preset speed is less than the first preset speed. The second preset speed can be 180mm / s, 200mm / s, 220mm / s, etc. This application embodiment does not limit the second preset speed, and it can be determined according to the actual situation.
[0098] When any one of the multiple stopping conditions is detected, the left and right flat blocks are controlled to stop moving.
[0099] After the pressure holding time is completed, control the left flat block to move to the left pre-flat position, and control the right flat block to move to the right pre-flat position.
[0100] Among them, several stopping conditions include:
[0101] The torque applied to the left-hand flat block reaches the torque threshold.
[0102] The left-hand flat block reaches the left-hand flat position.
[0103] The torque applied to the right-hand flat block reaches the torque threshold.
[0104] The right-hand flat block reaches the right-hand flat position.
[0105] When any of the multiple stopping conditions is met, the left and right flattening blocks are controlled to stop moving, ensuring that the torque of the flattening blocks does not exceed the torque threshold and that the flattening blocks do not move beyond the flattening position. This ensures that the tabs of the cylindrical battery cells are pressed tightly and that they are not damaged.
[0106] It should be noted that the acceleration of the left flat block as it moves from the left pre-flat position to the left flat position, and the acceleration of the right flat block as it moves from the right pre-flat position to the right flat position, are both preset values.
[0107] The left-side flat block moves from the left pre-flat position to the left flat position, accelerating from 0 with a preset acceleration value. If it can accelerate to the second preset speed, it will run at a constant speed after accelerating to the second preset speed.
[0108] The right-side flat block moves from the right pre-flat position to the right flat position, accelerating from 0 with a preset acceleration value. If it can accelerate to the second preset speed, it will run at a constant speed after accelerating to the second preset speed.
[0109] The acceleration of both the left and right flat blocks is a preset value, and the constant acceleration ensures consistent flattening pressure.
[0110] The preset value can be 900 mm / s², 1000 mm / s², 1200 mm / s², etc. This application embodiment does not limit the preset value and can be determined according to the actual situation.
[0111] It should be noted that the preset distance between the left starting position and the left pre-pressing position may not be equal to the preset distance between the right starting position and the right pre-pressing position. Therefore, this step should be performed after the left pressing block has moved to the left pre-pressing position and the right pressing block has moved to the right pre-pressing position. If one of the two pressing blocks moves to the corresponding pre-pressing position first, it needs to stop moving and wait for the other pressing block to move to the corresponding pre-pressing position before performing this step, so that the two pressing blocks are synchronized.
[0112] It should be noted that the torque of the flattening block in this application can be characterized using the torque of a servo motor. The battery cell flattening device has a servo motor, which drives a lead screw to rotate. The flattening block is connected to the lead screw, and the rotation of the lead screw can move the flattening block. Therefore, the torque and position of the flattening block can be determined through the operating data of the servo motor.
[0113] S204: Control the left flat block to move to the preset left starting position, and control the right flat block to move to the preset right starting position.
[0114] In this step, after completing the preset number of flattening and pressure holding processes, the cell flattening device controls the left flattening block to move to the preset left starting position and controls the right flattening block to move to the preset right starting position, thus completing the flattening of the cylindrical cell and facilitating the subsequent flattening of other cylindrical cells.
[0115] The cylindrical battery cell flattening method provided in this embodiment determines the left pre-flattening position, right pre-flattening position, left flattening position, and right flattening position based on the obtained cell design length and actual cell length. Then, it controls the left flattening block to move from a preset left starting position to the left pre-flattening position at a first preset speed, and controls the right flattening block to move from a preset right starting position to the right pre-flattening position at the same first preset speed. Furthermore, based on the torque threshold, the left flattening position, and the right flattening position, it controls the left and right flattening blocks to perform a preset number of flattening and holding processes. Finally, it controls the left flattening block to move to the preset left starting position and the right flattening block to move to the preset right starting position. This solution uses torque thresholds and left and right flattening positions calculated based on the cell design length to perform pressing and pressure holding, ensuring that the torque of the flattening block does not exceed the torque threshold and that the flattening block does not move beyond the flattening position. This ensures that the tabs of the cylindrical cell are pressed tightly and that the cylindrical cell is not damaged, effectively avoiding undervoltage or overvoltage situations.
[0116] Furthermore, by moving the flattening block from the starting position to the pre-flattening position at a relatively fast speed, the flattening efficiency can be improved. Multiple pressing and holding processes can improve the flatness and compactness of the cylindrical battery cell's tabs. By first moving the flattening block from the starting position to the pre-flattening position, if the battery cell's placement is not between the two pre-flattening positions, the flattening block can push the battery cell between them, thus achieving battery cell positioning.
[0117] Figure 4 This is a flowchart illustrating a second embodiment of the cylindrical battery cell flattening method provided in this application. Based on the above embodiments, this application describes how the battery cell flattening equipment acquires the spacing between the flattening blocks in real time during the pressing and holding processes, and then determines whether to issue an alarm based on the spacing between the flattening blocks. Figure 4 As shown, the flattening method for this cylindrical battery cell specifically includes the following steps:
[0118] S401: During the process of controlling the left and right flat blocks to perform a preset number of pressing and holding operations, the distance between the left and right flat blocks is obtained in real time.
[0119] In order to determine whether there is any abnormality in the flattening due to equipment failure, the battery cell flattening device can obtain the distance between the left and right flattening blocks in real time during the process of controlling the left and right flattening blocks to perform a preset number of flattening and holding processes.
[0120] It should be noted that the battery cell flattening equipment contains a servo motor, which drives a lead screw to rotate. The flattening blocks are connected to the lead screw, and the rotation of the lead screw moves the flattening blocks. Therefore, the torque and position of the flattening blocks can be determined by the operating data of the servo motor, and thus the spacing between the flattening blocks can be determined.
[0121] S402: Use the minimum value among all the spacings of the flattened blocks as the target spacing.
[0122] In this step, after the pressing and holding processes are completed, the cell flattening equipment takes the minimum value among all the flattening block spacings as the target spacing. The target spacing represents the length of the cylindrical cell after flattening.
[0123] S403: If the target spacing is not within the preset spacing range, an alarm will be issued.
[0124] In this step, after the cell flattening device obtains the target spacing, it determines whether the target spacing falls within the preset spacing range. If the target spacing does not fall within the preset spacing range, it indicates that the length of the cylindrical cell after flattening is abnormal, the flattening process is malfunctioning, and the cell flattening device is faulty, thus triggering an alarm.
[0125] It should be noted that the preset spacing range can be 88.7-89.3 mm, 88.8-89.3 mm, 88.7-89.2 mm, etc. This application embodiment does not limit the preset spacing range, and it can be determined according to the actual situation.
[0126] It should be noted that the preset spacing range can also be generated based on the cell design length and a preset error value. The difference between the cell design length and the preset error value is taken as the minimum value of the preset spacing range; the sum of the cell design length and the preset error value is taken as the maximum value of the preset spacing range; and thus, the preset spacing range can be generated based on the maximum and minimum values of the preset spacing range. The preset error value can be 0.2mm, 0.3mm, 0.4mm, etc. This application embodiment does not limit the preset error value and can determine it according to the actual situation.
[0127] The cylindrical cell flattening method provided in this embodiment improves the safety of the cell flattening equipment and the subsequent flattening process by issuing an alarm when the minimum distance between the left and right flattening blocks is determined to be outside the preset distance range.
[0128] Figure 5 This is a flowchart illustrating Embodiment 3 of the cylindrical battery cell flattening method provided in this application. Based on the above embodiments, this application describes the calculation of the torque threshold by the battery cell flattening device before the flattening process. Figure 5 As shown, the flattening method for this cylindrical battery cell specifically includes the following steps:
[0129] S501: Obtain torque calculation parameters.
[0130] In this step, to ensure that there is no undervoltage or overvoltage during the flattening process of the cylindrical battery cell, the battery cell flattening equipment can obtain torque calculation parameters before flattening in order to calculate the torque threshold.
[0131] The torque calculation parameters include lead screw lead, lead screw efficiency coefficient, lead screw friction coefficient, flattening block mass, and calibrated flattening pressure.
[0132] It should be noted that the calibrated flattening pressure is the pressure that can press the tabs of the cylindrical cell tightly while ensuring that the cylindrical cell will not be damaged.
[0133] S502: Calculate the torque threshold based on the torque calculation parameters and the preset torque calculation formula.
[0134] In this step, after the cell flattening device obtains the torque calculation parameters, it can calculate the torque threshold based on the torque calculation parameters and the preset torque calculation formula.
[0135] The preset torque calculation formula is: ,in, This represents the torque threshold, and P represents the lead of the lead screw. This represents the lead screw efficiency coefficient. This represents the coefficient of friction of the lead screw. W represents the acceleration due to gravity, F represents the mass of the flattening block, and F represents the calibrated flattening pressure.
[0136] The flattening method for cylindrical cells provided in this embodiment calculates the torque threshold by calibrating the flattening pressure. During the subsequent movement of the flattening blocks from the pre-flattening position to the flattening position, if the torque of the flattening blocks reaches the torque threshold, the two flattening blocks stop moving. This method can both press the tabs of the cylindrical cells firmly and ensure that the cylindrical cells are not damaged.
[0137] The following are embodiments of the apparatus described in this application, which can be used to execute the embodiments of the method described in this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the method described in this application.
[0138] Figure 6 This is a schematic diagram of an embodiment of the cylindrical battery cell flattening device provided in this application; the device can be integrated into the battery cell flattening equipment in the above method embodiments, or it can be implemented through the battery cell flattening equipment in the above method embodiments. Figure 6 As shown, the flattening device 60 for the cylindrical battery cell includes:
[0139] Processing module 61 is used to determine the left pre-flat position, right pre-flat position, left flat position and right flat position based on the obtained cell design length and actual cell length;
[0140] Control module 62 is used for:
[0141] Control the left flat block to move from the preset left starting position to the left pre-flat position at the first preset speed, and control the right flat block to move from the preset right starting position to the right pre-flat position at the first preset speed;
[0142] Based on the torque threshold, the left and right flattening positions, control the left and right flattening blocks to perform a preset number of flattening presses and pressure holding processes;
[0143] Control the left flat block to move to the preset left starting position, and control the right flat block to move to the preset right starting position.
[0144] Furthermore, the processing module 61 is specifically used for:
[0145] The sum of half the actual length of the battery cell and the preset first distance is used as the pre-shooting flat distance;
[0146] The position at the left pre-sampling distance from the center of the preset battery cell is taken as the left pre-sampling position;
[0147] The position at the pre-sampling distance to the right of the preset cell center position is taken as the right pre-sampling position;
[0148] The difference between half the actual length of the battery cell and the preset second distance is taken as the flattening distance;
[0149] The position at the left-side flattening distance of the preset cell center position is taken as the left flattening position;
[0150] The position at the right-side flattening distance of the preset cell center position is taken as the right flattening position.
[0151] Furthermore, the control module 62 is specifically used for:
[0152] Determine the holding time based on the current number of attempts;
[0153] According to the second preset speed, the left flat-striking block is controlled to move from the left pre-flat-striking position to the left flat-striking position, while the right flat-striking block is controlled to move from the right pre-flat-striking position to the right flat-striking position; the second preset speed is less than the first preset speed;
[0154] When any one of the multiple stopping conditions is detected, control the left and right flat blocks to stop moving;
[0155] After the pressure holding time, control the left flat block to move to the left pre-flat position, and control the right flat block to move to the right pre-flat position;
[0156] Among them, several stopping conditions include:
[0157] The torque applied to the left-hand flat block reaches the torque threshold;
[0158] The left-hand flat block reaches the left-hand flat position;
[0159] The torque applied when hitting the flat block with the right hand reaches the torque threshold.
[0160] The right-hand flat block reaches the right-hand flat position.
[0161] Furthermore, the acceleration of the left flat block as it moves from the left pre-flat position to the left flat position, and the acceleration of the right flat block as it moves from the right pre-flat position to the right flat position, are both preset values.
[0162] The acquisition module 63 is used to acquire the spacing between the left and right flat blocks in real time during the process of controlling the left and right flat blocks to perform a preset number of pressing and holding processes.
[0163] Furthermore, the processing module 61 is also used for:
[0164] The minimum value among all the spacing between the flattened blocks is taken as the target spacing;
[0165] If the target spacing is not within the preset spacing range, an alarm will be triggered.
[0166] Furthermore, before determining the left pre-flattening position, right pre-flattening position, left flattening position, and right flattening position based on the obtained cell design length and actual cell length, the acquisition module 63 is also used to acquire torque calculation parameters, including lead screw lead, lead screw efficiency coefficient, lead screw friction coefficient, flattening block mass, and calibrated flattening pressure.
[0167] The processing module 61 is also used to calculate the torque threshold based on the torque calculation parameters and the preset torque calculation formula.
[0168] The cylindrical cell flattening device provided in this embodiment is used to execute the technical solution of the cell flattening device in any of the aforementioned method embodiments. Its implementation principle and technical effect are similar, and will not be described again here.
[0169] Figure 7 This is a structural schematic diagram of a battery cell flattening device provided in this application. Figure 7 As shown, the cell flattening device 70 includes:
[0170] Processor 71, memory 72, communication interface 73;
[0171] Memory 72 is used to store executable instructions of processor 71;
[0172] The processor 71 is configured to execute the technical solution of the cell flattening device in any of the foregoing method embodiments by executing executable instructions.
[0173] Optionally, the memory 72 can be either standalone or integrated with the processor 71.
[0174] Optionally, when the memory 72 is a device independent of the processor 71, the cell flattening device 70 may further include:
[0175] Bus 74, memory 72 and communication interface 73 are connected to processor 71 through bus 74 and complete communication with each other. Communication interface 73 is used to communicate with other devices.
[0176] Optionally, the communication interface 73 can be implemented using a transceiver. The communication interface is used to enable communication between the database access device and other devices (e.g., clients, read-write databases, and read-only databases). The memory may include random access memory (RAM) and may also include non-volatile memory, such as at least one disk drive.
[0177] Bus 74 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, only one thick line is used in the diagram, but this does not indicate that there is only one bus or one type of bus.
[0178] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.
[0179] The cell leveling device also includes a left leveling mechanism and a right leveling mechanism. The left leveling mechanism includes a left servo motor, a lead screw, and a left leveling block, while the right leveling mechanism includes a right servo motor, a lead screw, and a right leveling block. The processor can control the rotation of the left and right servo motors.
[0180] The cell flattening device is used to execute the technical solution of the cell flattening device in any of the aforementioned method embodiments. Its implementation principle and technical effect are similar, and will not be described again here.
[0181] This application also provides a readable storage medium storing a computer program thereon, which, when executed by a processor, implements the technical solutions provided in any of the foregoing method embodiments.
[0182] This application also provides a computer program product, including a computer program, which, when executed by a processor, is used to implement the technical solutions provided in any of the foregoing method embodiments.
[0183] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.
[0184] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A method of flattening a cylindrical cell, characterized by, The method comprises the following steps: determining the left pre-flattening position, the right pre-flattening position, the left flattening position and the right flattening position according to the obtained design length of the battery cell and the actual length of the battery cell; controlling the left flattening block to move from the preset left starting position to the left pre-flattening position at a first preset speed, and controlling the right flattening block to move from the preset right starting position to the right pre-flattening position at the first preset speed; controlling the left flattening block and the right flattening block to perform pre-set flattening times of pressing and pressure maintaining according to the torque threshold, the left flattening position and the right flattening position; controlling the left flattening block to move to the preset left starting position, and controlling the right flattening block to move to the preset right starting position.
2. The method of claim 1, wherein, The method further comprises the following steps: taking the sum of one-half of the actual length of the battery cell and a preset first distance as a pre-flattening distance; taking the position on the left side of the preset battery cell center position by the pre-flattening distance as the left pre-flattening position; taking the position on the right side of the preset battery cell center position by the pre-flattening distance as the right pre-flattening position; taking the difference between one-half of the actual length of the battery cell and a preset second distance as a flattening distance; taking the position on the left side of the preset battery cell center position by the flattening distance as the left flattening position; taking the position on the right side of the preset battery cell center position by the flattening distance as the right flattening position.
3. The method of claim 1, wherein, Each time the left flattening block and the right flattening block are controlled to perform pressing and pressure maintaining, the method comprises the following steps: determining a pressure maintaining duration according to the current number of times; controlling the left flattening block to move from the left pre-flattening position to the left flattening position at a second preset speed, and controlling the right flattening block to move from the right pre-flattening position to the right flattening position at the second preset speed; the second preset speed is smaller than the first preset speed; controlling the left flattening block and the right flattening block to stop moving when any one of a plurality of stop conditions is met; controlling the left flattening block to move to the left pre-flattening position and controlling the right flattening block to move to the right pre-flattening position after the pressure maintaining duration; The plurality of stop conditions comprise: the torque of the left flattening block reaches the torque threshold; the left flattening block reaches the left flattening position; the torque of the right flattening block reaches the torque threshold; the right flattening block reaches the right flattening position.
4. The method of claim 3, wherein, The acceleration of the left flattening block moving from the left pre-flattening position to the left flattening position and the acceleration of the right flattening block moving from the right pre-flattening position to the right flattening position are both preset values.
5. The method according to any one of claims 1 to 4, characterized in that, The method further comprises the following steps: acquiring the flattening block distance between the left flattening block and the right flattening block in real time during the process of controlling the left flattening block and the right flattening block to perform pre-set flattening times of pressing and pressure maintaining; taking the minimum value of all flattening block distances as a target distance; if the target distance does not belong to a preset distance range, an alarm is given.
6. The method according to any one of claims 1 to 4, characterized in that, Before the step of determining the left pre-flattening position, the right pre-flattening position, the left flattening position and the right flattening position according to the obtained design length of the battery cell and the actual length of the battery cell, the method further comprises the following steps: Obtain torque calculation parameters, the torque calculation parameters including lead screw lead, lead screw efficiency coefficient, lead screw friction coefficient, flat block mass and calibration flat pressure; Calculate the torque threshold according to the torque calculation parameters and a preset torque calculation formula.
7. A flattening device for cylindrical cells, characterized in that, It comprises: A processing module configured to determine a left pre-flattening position, a right pre-flattening position, a left flattening position and a right flattening position according to the obtained design length of the battery cell and the actual length of the battery cell; A control module configured to: Control the left flattening block to move from a preset left starting position to the left pre-flattening position at a first preset speed, and control the right flattening block to move from a preset right starting position to the right pre-flattening position at the first preset speed; Control the left flattening block and the right flattening block to perform a preset number of times of flattening and pressure maintaining according to the torque threshold, the left flattening position and the right flattening position; Control the left flattening block to move to the preset left starting position, and control the right flattening block to move to the preset right starting position.
8. An electrode cell flattening apparatus, characterized by, It comprises: A processor, a memory and a communication interface; The memory is configured to store executable instructions of the processor; The processor is configured to execute the flattening method of the cylindrical battery cell according to any one of claims 1 to 6 by executing the executable instructions.
9. A readable storage medium, having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the flattening method of the cylindrical battery cell according to any one of claims 1 to 6.
10. A computer program product, characterised in that, It comprises a computer program, which is executed by the processor to implement the flattening method of the cylindrical battery cell according to any one of claims 1 to 6.