Battery cell winding method, system and device and storage medium
By obtaining the electrode thickness and calculating the electrode spacing during the cell winding process, and optimizing the electrode position using a winding curve model, the problem of electrode misalignment was solved, thus improving the safety and welding quality of the cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-17
- Publication Date
- 2026-03-31
AI Technical Summary
In the current technology, during the cell winding process, the electrode tabs are misaligned due to the thickness fluctuation of the electrode sheets in the electrode roll, which is difficult to correct effectively, affecting the safety of the cell and the welding quality.
By obtaining the thickness of the target electrode roll, calculating the electrode spacing, and performing electrode shearing during the winding process to form a battery cell, the electrode position is optimized using a winding curve model to reduce the impact of thickness fluctuations.
It effectively corrects electrode misalignment, improves cell safety, reduces welding defects and uneven thickness, and ensures that the cell can be smoothly placed into the battery casing.
Smart Images
Figure CN121769167A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery manufacturing technology, and in particular to a method, system, apparatus, and storage medium for winding battery cells. Background Technology
[0002] Currently, battery cells are formed by winding positive electrode sheets, negative electrode sheets, and a separator. During the winding process, the thickness fluctuations of the electrode sheets in the coil can easily cause misalignment of the electrode tabs.
[0003] To reduce the misalignment of the electrode tabs during the winding process, the rotation angle of the winding needle can be adjusted according to the current thickness of the electrode sheet during the winding process, so as to adjust the tension on the electrode sheet in the electrode roll and thus adjust the position of the electrode tabs.
[0004] However, in related technologies, when the thickness of the electrode sheets in the electrode winding fluctuates significantly, the resulting tab misalignment is substantial. Adjusting the winding needle rotation angle alone is insufficient to correct this large tab misalignment. Therefore, these technologies are ineffective in correcting tab misalignment within the battery cell, thus reducing the cell's safety. Summary of the Invention
[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.
[0006] This application provides a method, system, device, and storage medium for winding a battery cell, which can effectively correct the misalignment of the electrode tabs in the battery cell during the winding process, thereby improving the safety of the battery cell.
[0007] In a first aspect, embodiments of this application provide a method for winding a battery cell, comprising: Obtain the thickness of the target polar roll; Calculate the tab spacing of the target pole roll based on its thickness; Based on the tab spacing of the target electrode roll, the tabs of the target electrode roll are sheared and wound to form a battery cell.
[0008] Optionally, before obtaining the thickness of the target electrode roll, the method further includes: obtaining the thickness data of the parent roll; wherein the parent roll is divided into multiple target electrode rolls according to a preset width; corresponding to the multiple target electrode rolls, the thickness data of the parent roll is divided into multiple thickness data; using the multiple thickness data, the thickness data missing in the electrode sheet of the target electrode roll is filled to obtain the thickness of the target electrode roll; and the thickness of the target electrode roll and the preset identifier of the target electrode roll are associated and stored.
[0009] Optionally, after obtaining the thickness of the target electrode roll, the method further includes: when the target electrode roll is a negative electrode roll, inputting the rolling force into the thickness rebound model so that the thickness rebound model outputs the rebound amount of the electrode sheet in the target electrode roll; and adjusting the thickness of the target electrode roll according to the rebound amount of the electrode sheet in the target electrode roll.
[0010] Optionally, obtaining the thickness of the target polarity includes: reading a preset identifier of the target polarity; and obtaining the thickness of the target polarity based on the correlation between the thickness of the target polarity and the preset identifier.
[0011] Optionally, after obtaining the thickness of the target electrode roll, the method further includes: obtaining the electrode length consumed in replacing the target electrode roll; and updating the thickness of the target electrode roll based on the consumed electrode length.
[0012] Optionally, the tab spacing of the target electrode roll is calculated based on the thickness of the target electrode roll, including: inputting the thickness of the target electrode roll into the winding curve model so that the winding curve model outputs the tab spacing of the target electrode roll.
[0013] Optionally, the electrode sheet of the target electrode roll is subjected to tab shearing and winding, including: during the winding process, detecting whether tab misalignment occurs; if tab misalignment occurs, inputting the thickness of the electrode sheet of the target electrode roll that has not undergone tab shearing into the winding curve model so that the winding curve model outputs the corrected tab spacing of the target electrode roll; and performing tab shearing and winding on the electrode sheet of the target electrode roll according to the corrected tab spacing of the target electrode roll.
[0014] Secondly, embodiments of this application provide a battery cell winding system, which includes at least a host computer and a winding machine, wherein: The host computer is electrically connected to the winding machine. It is used to obtain the thickness of the target pole roll, calculate the pole tab spacing of the target pole roll based on the thickness of the target pole roll, and send the pole tab spacing of the target pole roll to the winding machine. A winding machine is used to cut and wind the electrode sheets of a target electrode roll according to the electrode tab spacing to form a battery cell.
[0015] Thirdly, embodiments of this application provide a battery cell winding apparatus, comprising: The thickness acquisition module is used to acquire the thickness of the target polar roll. The spacing calculation module is used to calculate the tab spacing of the target electrode roll based on the thickness of the target electrode roll; The electrode winding module is used to cut and wind the electrode sheets of the target electrode roll according to the electrode tab spacing of the target electrode roll to form a battery cell.
[0016] Fourthly, embodiments of this application provide a storage medium storing program instructions, wherein the program instructions, when running, execute the cell winding method of the first aspect.
[0017] This application provides a method, system, apparatus, and storage medium for winding battery cells, which can achieve the following technical effects: During the cell winding process, the thickness of the target electrode roll is obtained in advance, and the tab spacing of the target electrode roll is calculated based on the thickness. While winding the electrode sheets of the target electrode roll, tab shearing is performed according to the tab spacing of the target electrode roll, thereby forming the cell. In this way, because the tab spacing of the target electrode roll is predetermined and determined with reference to the thickness of the target electrode roll, tab shearing during the winding process can reduce the impact of electrode thickness fluctuations on the tab position, effectively correcting tab misalignment in the cell and improving cell safety.
[0018] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description
[0019] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are considered similar elements. The drawings do not constitute a limitation of scale, and wherein: Figure 1 This is a schematic diagram of a battery cell winding method; Figure 2 This is a schematic diagram of a battery cell winding system provided in an embodiment of this application; Figure 3 This is a schematic diagram of a battery cell winding method provided in an embodiment of this application; Figure 4 This is a schematic diagram of a target pole roll provided in an embodiment of this application; Figure 5 This is a schematic diagram of the verification result of a winding curve model provided in an embodiment of this application; Figure 6 This is a schematic diagram illustrating a method for measuring the thickness of a master roll, as provided in an embodiment of this application. Figure 7 This is a schematic diagram of a battery cell winding device provided in an embodiment of this application; Figure 8 This is a schematic diagram of a battery cell winding device provided in an embodiment of this application. Detailed Implementation
[0020] Currently, battery cells are formed by winding positive electrode sheets, negative electrode sheets, and a separator. The specific winding method is as follows: Figure 1As shown, a battery cell is formed by sequentially wrapping a winding needle with a negative electrode sheet, a separator, a positive electrode sheet, and a separator. During the winding process, the thickness fluctuation of the positive or negative electrode sheet in the winding can easily cause the position of the cut tabs to shift, resulting in tab misalignment.
[0021] To reduce tab misalignment during winding, related technologies can adjust the rotation angle of the winding needle according to the current thickness of the electrode sheet. This adjusts the tension on the electrode sheet in the winding, thereby adjusting the position of the tabs. Specifically, if the electrode sheet is too thick, the rotation angle of the winding needle can be reduced to appropriately delay the leading tabs; if the electrode sheet is too thin, the rotation angle of the winding needle can be increased to appropriately advance the lagging tabs, thus adjusting the position of the tabs.
[0022] However, in related technologies, when the thickness of the electrode sheets in the electrode roll fluctuates significantly, the resulting tab misalignment is substantial. Adjusting the rotation angle of the winding needle can only achieve minor adjustments to the tab position, making it difficult to correct large tab misalignments. Therefore, when the thickness of the electrode sheets in the electrode roll fluctuates significantly, related technologies struggle to effectively correct tab misalignment within the battery cell. Tab misalignment within the battery cell can easily lead to internal short circuits, excessively high local current densities, and thermal runaway, reducing the cell's safety. Tab misalignment can also result in poor tab welding processes or excessive / uneven cell thickness, making it difficult to insert the cell into the battery casing.
[0023] Therefore, embodiments of this application provide a method, system, apparatus, and storage medium for winding a battery cell. The solution calculates the tab spacing of the target electrode roll based on its thickness before winding the target electrode roll to form the battery cell. This allows for tab shearing during subsequent winding of the target electrode roll, referencing the tab spacing. By determining the tab spacing based on the thickness of the target electrode roll, the impact of thickness fluctuations on tab position during winding is reduced, effectively correcting tab misalignment within the battery cell, preventing thermal runaway, and improving cell safety. Furthermore, solving the tab misalignment problem also reduces the likelihood of poor tab welding and uneven or excessively thick battery cells, ensuring proper placement of the battery cell within the battery casing.
[0024] To provide a more detailed understanding of the features and technical content of the embodiments of this application, the implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this application. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.
[0025] The terms "first," "second," etc., used in the specification, claims, and drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. Unless otherwise stated, the term "a plurality of" means two or more.
[0026] In this embodiment, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B. The term "and / or" describes an association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B. The term "correspondence" can refer to an association or binding relationship; A corresponding to B means that there is an association or binding relationship between A and B.
[0027] The following describes the method embodiments provided in this application.
[0028] Before providing a more detailed description of the method embodiments provided in this application, the system to which the method provided in the embodiments of this application is applicable will be described.
[0029] Combination Figure 2 As shown in the figure, this application provides a battery cell winding system, which includes at least: a roller press 21, a thickness gauge 22, a slitting machine 23, a host computer 24, and a winding machine 25.
[0030] Roller press 21 is used to compact the coated and dried electrode sheets in order to increase the compaction density of the electrode, prevent the thickness of the electrode sheets from varying too much, and improve the flatness of the electrode sheet surface.
[0031] The thickness gauge 22 is electrically connected to the host computer 24 and is used to measure the thickness of the electrode sheet after rolling, obtain the thickness data of the master roll after rolling, and upload the thickness data of the master roll to the host computer 24.
[0032] The slitting machine 23 is used to cut the rolled master roll into multiple target electrode rolls according to a preset width, wherein the width of the target electrode roll is related to the desired cell length. For example, when the cell length is 8cm, the master roll can be cut to a width of 8cm to obtain target electrode rolls that match the cell length.
[0033] The host computer 24 is electrically connected to the winding machine 25. It is used to determine the thickness of each target pole roll after the master roll is cut according to the thickness data of the master roll, and to determine the pole tab spacing of the target pole roll according to the thickness of the target pole roll, and to send the pole tab spacing of the target pole roll to the winding machine 25.
[0034] The winding machine 25 is used to wind the target electrode roll and the separator to form a battery cell. The winding machine 25 integrates an electrode tab cutting module, which is used to cut the electrode tabs on the electrode sheet of the target electrode roll. The electrode tab cutting module can cut the electrode tabs by laser cutting.
[0035] The winding method of the battery cell provided in the embodiments of this application will be described below.
[0036] Combination Figure 3 As shown in the figure, this application provides a method for winding a battery cell, which can be applied to the above-mentioned battery cell winding system. The method includes the following steps: S31, obtain the thickness of the target polar roll.
[0037] In step S31, the target electrode roll refers to the electrode roll to be loaded and wound. The thickness of the target electrode roll is related to the thickness and length of the electrode sheets within it. Since the thickness of the target electrode roll fluctuates, the thickness of the electrode sheets at different locations within the target electrode roll may vary. The thickness of the target electrode roll can be represented by a thickness data set, where the data corresponds sequentially to the thickness data of each longitudinal position of the electrode sheets within the target electrode roll. Combined with... Figure 4 As shown in the figure, this application embodiment provides a schematic diagram of a target electrode roll. The longitudinal direction of the target electrode roll refers to the direction in which the electrode sheet is wound, that is, the direction indicated by the arrow in the figure.
[0038] In this embodiment, the thickness of the target polar roll and its preset identifier are stored together. When obtaining the thickness of the target polar roll, the preset identifier can be read, and the thickness data associated with the preset identifier can be obtained based on the association between the thickness of the target polar roll and the preset identifier, thereby obtaining the thickness of the target polar roll. The preset identifier of the target polar roll is used to uniquely identify the target polar roll. Thus, the corresponding thickness data can be quickly obtained through the unique identifier of the target polar roll, improving the convenience of obtaining the thickness of the target polar roll.
[0039] S32, calculate the tab spacing of the target electrode roll based on the thickness of the target electrode roll.
[0040] In step S32, the tab spacing of the target electrode roll can be pre-calculated based on the thickness of the target electrode roll using a winding curve model. Specifically, the winding curve model can be an Archimedean spiral model, trained iteratively based on actual data of tab shearing during the actual winding process. During the training and iterative generation of the winding curve model, the influence of factors such as the upper and lower tolerances of the electrode sheet and the winding tension on the electrode sheet on the tab spacing is considered. Data such as the thickness of the electrode roll (positive and negative), the diaphragm thickness, the winding tension, and the thickness tolerance of the electrode sheet are input into the winding curve model for iterative training. The winding curve model mainly calculates the tab spacing based on the spiral equation r = a × θ + b, where r is the instantaneous radius of winding, a is the instantaneous radius increment per radian during winding, θ is the angle of rotation of the winding needle during winding, and b is the initial winding radius. Specifically, the process of calculating the tab spacing of the target electrode roll using the winding curve model is as follows: The radius of the winding needle is calculated based on its circumference. To ensure the winding needle has an insulating bottom layer, a pre-wound diaphragm of a predetermined number of turns needs to be wound onto the needle before winding the target electrode sheet, forming the bottom layer. Thus, the initial winding radius *b* can be calculated based on the needle radius and the predetermined number of diaphragm turns. Based on the helix equation, with the instantaneous radius *r*, the rotation angle *θ* of the winding needle, and the initial winding radius *b* known, the instantaneous radius increment *a* corresponding to each radian during winding can be calculated. Based on the calculated instantaneous radius increment *a* corresponding to each radian during winding, the initial winding radius *b*, the required eccentricity of the tab relative to the winding center, and the predetermined width of the tab, the specific position of the tab on each turn of the electrode sheet can be calculated, i.e., the starting and ending positions of the tab, thereby obtaining the tab spacing on the electrode sheet in the target electrode roll.
[0041] In this embodiment, the process of calculating the tab spacing is encapsulated as a winding curve model, and the calculation of the tab spacing is performed using the winding curve model, which can improve the calculation efficiency of the tab spacing. During the construction of the winding curve model, various factors affecting the tab spacing are also considered, thereby improving the accuracy of the calculations performed by the constructed winding curve model.
[0042] In this embodiment, to further ensure the accuracy of the winding curve model calculation, the winding curve model was verified. Specifically, the misalignment amount of the tab spacing output by the winding curve model was calculated, and the difference between this misalignment amount and the actual misalignment amount measured after tab shearing and winding based on the tab spacing output by the winding curve model was calculated. The smaller the misalignment difference, the more accurate the tab spacing output by the winding curve model. Specifically, the winding curve model can be verified using the winding process of 400 battery cells. The verification results can be as follows: Figure 5As shown, the misalignment difference of 400 cells was within 4mm, and the number of cells with a misalignment difference within 3mm accounted for approximately 90%. This demonstrates that the winding curve model has high calculation accuracy.
[0043] S33, according to the tab spacing of the target electrode roll, the tabs of the target electrode roll are sheared and wound to form a battery cell.
[0044] In step S33, when the electrode sheet of the target electrode roll is wound, the electrode sheet of the target electrode roll can be sheared according to the electrode tab spacing of the target electrode roll, so as to obtain an electrode sheet with multiple tabs to participate in the winding and form a multi-tab battery cell.
[0045] In this embodiment, the number of tabs to be cut during the winding process can be preset. When the number of tabs cut reaches the preset number, it is determined that one battery cell has been wound.
[0046] The cell winding method provided in this application allows for the pre-determining of the target electrode roll thickness during the winding process, and the calculation of the tab spacing based on this thickness. Simultaneously with winding the electrode sheets of the target electrode roll, tab shearing is performed according to the tab spacing to form the cell. Thus, because the tab spacing of the target electrode roll is predetermined and determined with reference to the target electrode roll thickness, tab shearing during winding reduces the impact of electrode thickness fluctuations on tab position, effectively correcting tab misalignment and improving cell safety. Furthermore, resolving tab misalignment also reduces the likelihood of defective tab welding and uneven or excessive cell thickness, ensuring proper placement of the cell within the battery casing.
[0047] The optional implementation methods involved in the battery cell winding method provided in the embodiments of this application will be described below.
[0048] Optionally, before step S31 above, i.e., before obtaining the thickness of the target electrode roll, the method further includes: obtaining the thickness data of the parent roll; dividing the parent roll into multiple target electrode rolls according to a preset width; dividing the thickness data of the parent roll into multiple thickness data sets; using the multiple thickness data sets to fill in the missing thickness data of the electrode sheets in the target electrode rolls to obtain the thickness of the target electrode rolls; and associating and storing the thickness of the target electrode rolls with a preset identifier of the target electrode rolls.
[0049] The specific implementation method of cutting the rolled master roll into multiple target pole rolls according to a preset width has been described in the aforementioned embodiments and will not be repeated here.
[0050] In this embodiment, the thickness gauge typically uses a "Z"-shaped scanning method to measure the thickness of the master roll. The specific scanning method is as follows: Figure 6 As shown. After the master volume is divided into multiple target polar volumes according to a preset width, the thickness data of the master volume can be divided into multiple thickness data sets according to the division method of the multiple target polar volumes. Combined with... Figure 6 As shown, taking the average division of the parent roll into two target pole rolls as an example, the thickness data of the parent roll is divided into two parts according to the dividing line: thickness data 1 and thickness data 2. In thickness data 1, region A is valid data, and in thickness data 2, region B is valid data. Since the thickness of the pole pieces within a short distance of the target pole rolls is similar, missing thickness data in the target pole rolls can be filled using the valid data to obtain the complete thickness data of the pole pieces in the target pole rolls, and thus the thickness of the target pole rolls. For thickness data 1 and thickness data 2, symmetrical filling can be performed using the valid data from region A and region B.
[0051] It should be noted that when performing data filling, the data filling distance can be set, that is, the thickness data within the preset distance on the electrode can be regarded as the same. The preset distance ranges from 0.2m to 0.8m, and the specific values can be 0.3m, 0.4m, 0.5m, 0.6m or 0.7m.
[0052] In this embodiment, after the master volume is divided into multiple target polar volumes, a preset identifier is assigned to each target polar volume. The preset identifier is used to distinguish between multiple target polar volumes. Since different target polar volumes may have the same thickness, to facilitate subsequent lookup of the thickness of each target polar volume, the thickness of the target polar volume and the preset identifier can be associated and stored.
[0053] In this implementation method, since the target electrode roll is obtained by cutting the mother roll, and the thickness gauge only measures the thickness data of the mother roll, the missing thickness data of the target electrode roll can be filled by using the effective data of the mother roll, so as to obtain the complete thickness data of the target electrode roll, thereby obtaining a more accurate thickness of the target electrode roll, and thus ensuring the accuracy of the subsequent calculation of the electrode tab spacing of the target electrode roll based on the thickness of the target electrode roll.
[0054] Furthermore, in the above embodiments, after obtaining the thickness of the target electrode roll, that is, before associating and storing the thickness of the target electrode roll with the preset identifier, it is necessary to consider the thickness rebound of the negative electrode roll when the target electrode roll is a negative electrode roll. Specifically, when the target electrode roll is a negative electrode roll, the rolling force is input to the thickness rebound model so that the thickness rebound model outputs the rebound amount of the electrode sheet in the target electrode roll, and the thickness of the target electrode roll is adjusted according to the rebound amount of the electrode sheet in the target electrode roll.
[0055] In this embodiment, since the electrode material in the negative electrode roll is usually graphite, the graphite electrode is prone to rebound after being rolled in the previous rolling process and then slitting. To accurately determine the thickness of the negative electrode roll, the amount of thickness rebound of the electrode in the negative electrode roll needs to be considered. The amount of electrode rebound is related to the rolling force during electrode rolling; generally, the greater the rolling force during electrode rolling, the greater the rebound rate of the electrode.
[0056] Based on the correlation between the rolling force and rebound amount of the electrode sheet, a thickness rebound model can be trained. Specifically, a large amount of mapping data between rolling force and rebound amount can be collected as training data. Using this training data to train the thickness rebound model yields a well-trained model. When calculating the rebound amount of the electrode sheet in the negative electrode coil, the rolling force can be input into the trained thickness rebound model to obtain the rebound amount of the electrode sheet output by the model. The rebound amount of the electrode sheet is then superimposed on the thickness of the negative electrode coil to obtain its thickness.
[0057] By employing this implementation method, the amount of rebound of the electrode sheet in the negative electrode coil can be determined based on the rolling force during the rolling process. Adjusting the thickness of the negative electrode coil based on this rebound amount ensures the accuracy of the negative electrode coil thickness. Thus, during subsequent winding, performing negative electrode tab shearing based on the accurate thickness of the negative electrode coil guarantees the accuracy of the negative electrode tab spacing. Simultaneously adjusting the positive electrode tab shearing process ensures the accuracy of the positive electrode tab spacing.
[0058] Optionally, after step S31 above, i.e. after obtaining the thickness of the target electrode roll, the method further includes: obtaining the electrode length consumed in replacing the target electrode roll, and updating the thickness of the target electrode roll based on the consumed electrode length.
[0059] In this embodiment, since replacing the target electrode roll consumes a certain length of electrode sheet, the thickness of the target electrode roll needs to be updated based on the consumed electrode sheet length to ensure the accuracy of the target electrode roll thickness. Specifically, the electrode sheet consumption length during target electrode roll replacement mainly consists of the length of the pre-wound rubber roller in manual roll changing and the length of adhesive applied when connecting electrode rolls. The adhesive application length when connecting electrode rolls refers to the length before tab cutting after adhesive application. The aforementioned consumed electrode sheet length can be calculated based on the preset length of the winding rubber roller and the adhesive application length, thereby updating the target electrode roll thickness based on the consumed electrode sheet length.
[0060] By adopting this implementation method, the thickness of the target electrode roll can be updated according to the electrode sheet length consumed during electrode roll replacement, thereby ensuring the accuracy of the target electrode roll thickness. Then, based on the thickness of the target electrode roll, the tab spacing of the target electrode roll can be calculated to ensure the accuracy of the tab spacing.
[0061] Optionally, in step S33 above, performing tab shearing and winding on the electrode sheets of the target electrode roll includes: during the winding process, detecting whether tab misalignment occurs, and if tab misalignment occurs, inputting the thickness of the electrode sheets of the target electrode roll that have not undergone tab shearing into the winding curve model, so that the winding curve model outputs the corrected tab spacing of the target electrode roll. Based on the corrected tab spacing of the target electrode roll, performing tab shearing and winding on the electrode sheets of the target electrode roll.
[0062] In this embodiment, before the electrode sheets of the target electrode roll are wound, although the tab spacing of the target electrode roll can be calculated based on the thickness of the target electrode roll using a winding curve model, during the winding process, in order to further avoid tab misalignment, a CCD (Charge-Coupled Device, industrial vision inspection system) can be used to detect whether tab misalignment has occurred. If tab misalignment occurs, the tab spacing of the target electrode roll is recalculated based on the thickness of the electrode sheets of the target electrode roll before tab shearing is performed using the winding curve model. Based on the corrected tab spacing, tab shearing and winding of the target electrode roll's electrode sheets are then performed.
[0063] By adopting this implementation method, it is possible to further monitor whether tab misalignment occurs during the cell winding process, so that if tab misalignment occurs, the tab spacing can be corrected in time, and tab shearing can be performed according to the corrected tab spacing, thereby further reducing the occurrence of tab misalignment during the cell winding process.
[0064] The following describes the product embodiments provided in this application.
[0065] Combination Figure 7 As shown, this application embodiment provides a battery cell winding device 700, including a thickness acquisition module 701, a spacing calculation module 702, and a pole roll winding module 703.
[0066] Thickness acquisition module 701 is used to acquire the thickness of the target polar roll.
[0067] The spacing calculation module 702 is used to calculate the tab spacing of the target electrode roll based on the thickness of the target electrode roll.
[0068] The electrode winding module 703 is used to perform electrode shearing and winding on the electrode sheets of the target electrode roll according to the electrode tab spacing of the target electrode roll to form a battery cell.
[0069] Optionally, before acquiring the thickness of the target electrode roll, the thickness acquisition module 701 is further configured to: acquire the thickness data of the parent roll, which is then divided into multiple target electrode rolls according to a preset width; divide the thickness data of the parent roll into multiple sets of thickness data; use the multiple sets of thickness data to fill in the missing thickness data of the electrode sheets in the target electrode roll to obtain the thickness of the target electrode roll; and associate and store the thickness of the target electrode roll with a preset identifier of the target electrode roll.
[0070] Optionally, after obtaining the thickness of the target electrode roll, the thickness acquisition module 701 is further configured to: when the target electrode roll is a negative electrode roll, input the rolling force to the thickness rebound model so that the thickness rebound model outputs the rebound amount of the electrode sheet in the target electrode roll. The thickness of the target electrode roll is then adjusted based on the rebound amount of the electrode sheet in the target electrode roll.
[0071] Optionally, when acquiring the thickness of the target polar roll, the thickness acquisition module 701 is specifically used to: read the preset identifier of the target polar roll, and acquire the thickness of the target polar roll based on the correlation between the thickness of the target polar roll and the preset identifier.
[0072] Optionally, after obtaining the thickness of the target electrode roll, the thickness acquisition module 701 is also used to: obtain the electrode length consumed in replacing the target electrode roll, and update the thickness of the target electrode roll based on the consumed electrode length.
[0073] Optionally, when calculating the tab spacing of the target electrode roll based on the thickness of the target electrode roll, the spacing calculation module 702 is specifically used to: input the thickness of the target electrode roll into the winding curve model so that the winding curve model outputs the tab spacing of the target electrode roll.
[0074] Optionally, the electrode winding module 703 performs tab shearing and winding on the electrode sheets of the target electrode roll. Specifically, during the winding process, it detects whether tab misalignment occurs, and if tab misalignment occurs, inputs the thickness of the electrode sheet of the target electrode roll that has not undergone tab shearing to the winding curve model, so that the winding curve model outputs the corrected tab spacing of the target electrode roll. Based on the corrected tab spacing of the target electrode roll, it performs tab shearing and winding on the electrode sheets of the target electrode roll.
[0075] The battery cell winding device 700 provided in this application embodiment is used to implement the battery cell winding method in the foregoing embodiment. The specific implementation method and beneficial effects can be referred to the foregoing embodiment, and will not be repeated here.
[0076] Combination Figure 8As shown, this application embodiment provides a battery cell winding device 800, including a processor 801 and a memory 802. Optionally, the device may further include a communication interface 803 and a bus 804. The processor 801, memory 802, and communication interface 803 can communicate with each other via the bus 804. The communication interface 803 can be used for information transmission. The processor 801 can call logical instructions in the memory 802 to execute the battery cell winding method described in the above embodiment.
[0077] Furthermore, the logic instructions in the aforementioned memory 802 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.
[0078] The memory 802, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this application. The processor 801 executes functional applications and data processing by running the program instructions / modules stored in the memory 802, thereby implementing the battery cell winding method in the above embodiments.
[0079] The memory 802 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 802 may include high-speed random access memory and may also include non-volatile memory.
[0080] This application provides a storage medium storing computer-executable instructions configured to execute the battery cell winding method described in the above embodiments.
[0081] The aforementioned storage medium can be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.
[0082] The technical solutions of this application embodiment can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this application embodiment. The aforementioned storage medium can be a non-transitory storage medium, including: USB flash drive, portable hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, and other media capable of storing program code; it can also be a transient storage medium.
[0083] This application provides a computer program product, including a computer program, which, when executed by a processor, implements the battery cell winding method described in the above embodiments.
[0084] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.
[0085] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.
[0086] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection 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. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of this application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
[0087] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description; sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.
Claims
1. A method for winding a battery cell, characterized in that, include: Obtain the thickness of the target polar roll; Calculate the tab spacing of the target electrode roll based on its thickness; Based on the tab spacing of the target electrode roll, the electrode sheets of the target electrode roll are sheared and wound to form a battery cell.
2. The method according to claim 1, characterized in that, Before obtaining the thickness of the target polar roll, the method further includes: Obtain the thickness data of the master roll; wherein the master roll is divided into multiple target pole rolls according to a preset width; Corresponding to the multiple target polar volumes, the thickness data of the parent volume is divided into multiple thickness data sets; Using the multiple thickness data sets, fill in the missing thickness data of the target electrode roll to obtain the thickness of the target electrode roll; The thickness of the target electrode roll and its preset identifier are associated and stored.
3. The method according to claim 2, characterized in that, After obtaining the thickness of the target polar roll, the method further includes: When the target electrode roll is a negative electrode roll, the rolling force is input to the thickness rebound model so that the thickness rebound model outputs the rebound amount of the electrode sheet in the target electrode roll; The thickness of the target electrode roll is adjusted according to the amount of rebound of the electrode sheet in the target electrode roll.
4. The method according to claim 1 or 2, characterized in that, The process of obtaining the thickness of the target polar roll includes: Read the preset identifier of the target polar volume; The thickness of the target electrode roll is obtained based on the correlation between the thickness of the target electrode roll and the preset identifier.
5. The method according to claim 1, characterized in that, After obtaining the thickness of the target polar roll, the method further includes: Obtain the length of the electrode sheet required to replace the target electrode roll; The thickness of the target electrode roll is updated based on the length of the electrode sheet consumed.
6. The method according to claim 1, characterized in that, Based on the thickness of the target electrode roll, the tab spacing of the target electrode roll is calculated, including: The thickness of the target electrode roll is input into the winding curve model so that the winding curve model outputs the tab spacing of the target electrode roll.
7. The method according to claim 1, characterized in that, The step of performing tab shearing and winding on the target electrode sheet includes: During the winding process, check for any electrode misalignment. In the event of tab misalignment, the thickness of the target electrode roll without tab shearing is input into the winding curve model so that the winding curve model outputs the corrected tab spacing of the target electrode roll. Based on the corrected tab spacing of the target electrode roll, the tab shearing and winding are performed on the electrode sheets of the target electrode roll.
8. A battery cell winding system, characterized in that, The system includes at least a host computer and a winding machine, wherein: The host computer is electrically connected to the winding machine and is used to obtain the thickness of the target electrode roll, calculate the electrode tab spacing of the target electrode roll based on the thickness of the target electrode roll, and send the electrode tab spacing of the target electrode roll to the winding machine. The winding machine is used to cut and wind the electrode sheets of the target electrode roll according to the electrode tab spacing of the target electrode roll to form a battery cell.
9. A winding device for a battery cell, characterized in that, include: The thickness acquisition module is used to acquire the thickness of the target polar roll. The spacing calculation module is used to calculate the tab spacing of the target electrode roll based on the thickness of the target electrode roll; The electrode winding module is used to perform electrode shearing and winding on the electrode sheets of the target electrode roll according to the electrode tab spacing of the target electrode roll, so as to form a battery cell.
10. A storage medium storing program instructions, characterized in that, When the program instructions are executed, they perform the winding method of the battery cell as described in any one of claims 1 to 7.