Winding method and winding device

Abstract

The invention provides a winding method and winding equipment, relates to the technical field of battery production, and aims to at least solve the problems of low detection efficiency, low accuracy, low productivity and the like when a battery cell formed after a winding process is detected in related technologies. The winding equipment comprises a first pole piece unwinding mechanism, a second pole piece unwinding mechanism, a first diaphragm unwinding mechanism, a second diaphragm unwinding mechanism, a winding mechanism, an auxiliary roller mechanism and a detection mechanism, the winding mechanism is used for winding a current first pole piece released by the first pole piece unwinding mechanism, a current first diaphragm released by the first diaphragm unwinding mechanism, a current second pole piece released by the second pole piece unwinding mechanism and a current second diaphragm released by the second diaphragm unwinding mechanism so as to form a current battery cell section; the auxiliary roller mechanism is used for applying pressure to the current battery cell section when abutting against the surface of the current battery cell section; and the detection mechanism is used for determining the detection result of the current cell section based on the current of the current loop.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to, but is not limited to, the technical field of battery production, and particularly relates to a winding method and a winding device. BACKGROUND

[0002] In the related art, the formed battery cell after the winding process is usually detected (for example, short circuit detection, open circuit detection, etc.), and there are problems of low detection efficiency, low accuracy, and low production rate. SUMMARY

[0003] The present disclosure provides a winding method and a winding device.

[0004] The technical scheme of the present disclosure is implemented as follows:

[0005] The present disclosure provides a winding device, comprising a first pole piece unwinding mechanism, a second pole piece unwinding mechanism, a first separator unwinding mechanism, a second separator unwinding mechanism, a winding mechanism, an auxiliary roller mechanism, and a detection mechanism, wherein:

[0006] The first pole piece unwinding mechanism is configured to release a first pole piece;

[0007] The second pole piece unwinding mechanism is configured to release a second pole piece;

[0008] The first separator unwinding mechanism is configured to release a first separator;

[0009] The second separator unwinding mechanism is configured to release a second separator;

[0010] The winding mechanism is configured to wind a current first pole piece released by the first pole piece unwinding mechanism, a current first separator released by the first separator unwinding mechanism, a current second pole piece released by the second pole piece unwinding mechanism, and a current second separator released by the second separator unwinding mechanism to form a current battery cell segment;

[0011] The auxiliary roller mechanism is configured to apply pressure to the current battery cell segment when pressed against the surface of the current battery cell segment;

[0012] The detection mechanism is configured to determine a detection result of the current battery cell segment based on a current of a current loop, wherein the current loop comprises the detection mechanism, a first conductive part of the first pole piece unwinding mechanism, a second conductive part of the second pole piece unwinding mechanism, and the current battery cell segment.

[0013] In the embodiments of the present disclosure, firstly, the auxiliary roller mechanism and the detection mechanism are integrated in the winding device, so that the winding, pressing and detection processes are carried out at the same time. Compared with the winding first, then pressing and finally detecting, on the one hand, the time of each independent process is reduced, the production efficiency is improved, thereby the production rate of the device is improved, on the other hand, the detection effect is improved, and the possibility of not detecting defects due to the pressure relief between the pole piece and the diaphragm, the pole piece and foreign matter (for example, burr, particle, dust, etc.), and the diaphragm and foreign matter is reduced; secondly, in the process of winding the current cell segment, the auxiliary roller mechanism continuously presses the current cell segment to sufficiently extrude the foreign matter, so that the influence of the foreign matter on the cell can be accurately detected, the possibility of missed detection and false detection is reduced, thereby the possibility of defective cell flowing out is reduced, and the heat dissipation and service life of the battery are ensured; thirdly, the conductive part is integrated in the pole piece unwinding mechanism, so that the pole piece unwinding mechanism has the conductive performance; then, the current loop is formed between the detection mechanism, the conductive part and the current cell segment, so that the short circuit caused by the foreign matter piercing the pole piece or the diaphragm, the open circuit caused by the current pole piece fracture, etc. can be effectively detected, the detection accuracy and comprehensiveness are improved, thereby the safety and reliability of the product are improved; finally, the current cell segment is automatically detected by the current of the current loop, compared with manual detection, the timeliness, accuracy, detection efficiency and automation degree of the detection result are improved, which can meet the production demand of high timeliness and high efficiency.

[0014] In some embodiments, the winding device further comprises a cutting mechanism, which is located upstream of the winding mechanism and is used to cut off the next pole piece released by the target pole piece unwinding mechanism in the case that the detection result of the current cell segment is a second detection result; wherein the second detection result represents that the current cell segment has defects, and the target pole piece unwinding mechanism comprises at least one of the first pole piece unwinding mechanism and the second pole piece unwinding mechanism.

[0015] In the embodiments of the present disclosure, on the one hand, the cutting mechanism is integrated in the winding device, which enriches the functions of the winding device and improves the versatility and adaptability of the winding device; on the other hand, the next pole piece is cut off in time when the current cell segment has an anomaly, which improves the pertinence of pole piece cutting processing, and compared with discarding the entire cell subsequently, only part of the cell is discarded, which achieves the purpose of saving materials, thereby reducing the manufacturing cost of the battery and improving the production rate of the device.

[0016] In some embodiments, the winding device further comprises a receiving mechanism, which is located upstream of the cutting mechanism and is used to connect the cut-off next pole piece to the winding mechanism to form a next cell.

[0017] In the embodiments of the present disclosure, on the one hand, the receiving mechanism is integrated in the winding device, which enriches the functions of the winding device and improves the versatility and adaptability of the winding device; on the other hand, after the next pole piece is cut off, the receiving mechanism is used to timely receive the pole piece, so as to ensure the normal production of the product and meet the production requirements of high timeliness and high efficiency.

[0018] In some embodiments, the auxiliary roller mechanism includes a first auxiliary roller mechanism and a second auxiliary roller mechanism symmetrically distributed, the first auxiliary roller mechanism is located on one side of the winding mechanism and is used to apply pressure to the current cell segment when pressing against the surface of the current cell segment; and the second auxiliary roller mechanism is located on the other side of the winding mechanism and is used to apply pressure to the current cell segment after being pressed by the first auxiliary roller mechanism when pressing against the surface of the current cell segment.

[0019] In the embodiments of the present disclosure, the current cell segment is pressed by two independent auxiliary roller mechanisms, which not only reduces the interference between them, but also increases the pressure duration of the current cell segment and improves the efficiency of defect detection.

[0020] In some embodiments, the auxiliary roller mechanism includes an auxiliary roller and a driving member, the driving member includes a first driving member and a second driving member, the first driving member is used to drive the auxiliary roller to approach or move away from the current cell segment, so as to reduce or increase the distance between the auxiliary roller and the current cell segment; and the second driving member is used to drive the auxiliary roller to roll on the surface of the current cell segment at a target rolling speed and a target rolling direction, so as to apply pressure to the current cell segment; wherein the target rolling speed is the same as the winding speed of the winding mechanism, and the target rolling direction is opposite to the winding direction of the winding mechanism.

[0021] In the embodiments of the present disclosure, on the one hand, the first driving member timely drives the auxiliary roller to move to approach or move away from the current cell segment, so as to ensure the normal progress of the pressing process; on the other hand, the second driving member drives the auxiliary roller to roll at the same rolling speed as the winding speed of the winding device and in the opposite rolling direction to the winding direction, so as to ensure that the pole piece and the separator are in a continuous pressing state, thereby improving the efficiency of defect detection.

[0022] In some embodiments, the auxiliary roller mechanism further comprises a pressure detection mechanism and a displacement detection mechanism, the displacement detection mechanism being configured to detect a current distance between the auxiliary roller and the current cell segment; the first driving member being further configured to drive the auxiliary roller to move based on the current distance detected by the displacement detection mechanism; the pressure detection mechanism being configured to detect a current pressure between the auxiliary roller and the current cell segment; and the first driving member being further configured to drive the auxiliary roller to move in a case where the current pressure is not within a pressure threshold range, so that the pressure between the auxiliary roller and the current cell segment is within the pressure threshold range.

[0023] In the embodiments of the present disclosure, on the one hand, the distance between the auxiliary roller and the current cell segment is accurately detected by the displacement detection mechanism integrated in the auxiliary roller mechanism, so as to accurately control the movement of the auxiliary roller; on the other hand, the pressure between the auxiliary roller and the current cell segment is detected in real time by the pressure detection mechanism integrated in the auxiliary roller mechanism, so as to accurately press the current cell segment, and the possibility of poor effect due to too small pressure and deformation of the cell segment due to too large pressure is reduced.

[0024] In some embodiments, the width of the auxiliary roller is not less than the width of the current cell segment.

[0025] In the embodiments of the present disclosure, by setting the width of the auxiliary roller to be not less than the width of the current cell segment, it is ensured that the pole piece is uniformly pressed in the whole, and the efficiency of defect detection is improved.

[0026] In some embodiments, the surface of the auxiliary roller is covered with a flexible material.

[0027] In the embodiments of the present disclosure, by covering the surface of the auxiliary roller with a flexible material, the wear resistance and smoothness of the auxiliary roller are effectively improved, so as to prolong the service life of the auxiliary roller, reduce the possibility of scratching and scratching the cell due to rough surface, and enhance the protection of the cell.

[0028] The present disclosure provides a winding method, which comprises:

[0029] The auxiliary roller mechanism of the winding device is controlled to apply pressure to the current cell segment when pressing against the surface of the current cell segment; wherein the winding device further comprises a first pole piece unwinding mechanism, a second pole piece unwinding mechanism, a first separator unwinding mechanism, a second separator unwinding mechanism, a winding mechanism and a detection mechanism, and the current cell segment is formed by the winding mechanism winding the current first pole piece released by the first pole piece unwinding mechanism, the current first separator released by the first separator unwinding mechanism, the current second pole piece released by the second pole piece unwinding mechanism and the current second separator released by the second separator unwinding mechanism;

[0030] determine a detection result of the current cell segment based on a current of a current loop; wherein the current loop comprises the detection mechanism, a first conductive part of the first pole piece unwinding mechanism, a second conductive part of the second pole piece unwinding mechanism, and the current cell segment.

[0031] In the embodiments of the present disclosure, firstly, the auxiliary roller mechanism and the detection mechanism are integrated in the winding device, so that the winding, pressing and detection processes are performed simultaneously. Compared with the process of winding first, pressing second and detecting last, on the one hand, the time of each independent process is reduced, the production efficiency is improved, thereby the production rate of the device is improved, on the other hand, the detection effect is improved, and the possibility of failing to detect defects due to the pressure relief between the pole piece and the separator, the pole piece and foreign matters (such as burrs, particles, dust, etc.), and the separator and foreign matters is reduced; secondly, in the process of winding the current cell segment, the auxiliary roller mechanism continuously presses the current cell segment to sufficiently extrude the foreign matters, so that the influence of the foreign matters on the cell can be accurately detected, the possibility of missed detection and false detection is reduced, thereby the possibility of defective cell flowing out is reduced, and the heat dissipation and service life of the battery are ensured; thirdly, the conductive part is integrated in the pole piece unwinding mechanism, so that the pole piece unwinding mechanism has the conductive property; then, the current loop is formed among the detection mechanism, the conductive part and the current cell segment, so that the short circuit caused by the foreign matters piercing the pole piece or the separator, the open circuit caused by the current pole piece breaking, etc. can be effectively detected, the detection accuracy and comprehensiveness are improved, thereby the safety and reliability of the product are improved; finally, the current of the current loop is used to automatically detect the current cell segment, compared with manual detection, the timeliness, accuracy, detection efficiency and automation degree of the detection result are improved, and the production demand of high timeliness and high efficiency can be met.

[0032] In some embodiments, the detection result of the current cell segment is determined based on the current of the current loop, including: determining the resistance of the current cell segment based on the current of the current loop and a current detection voltage; wherein the current detection voltage is determined based on the current separator; in a case that the resistance of the current cell segment is within a resistance threshold range, a first detection result is taken as the detection result of the current cell segment; wherein the first detection result represents that the current cell segment does not have defects; in a case that the resistance of the current cell segment is not within the resistance threshold range, a second detection result is taken as the detection result of the current cell segment; wherein the second detection result represents that the current cell segment has defects.

[0033] In the embodiments of the present disclosure, on the one hand, the current detection voltage is determined according to the current diaphragm, which not only improves the accuracy of the current detection voltage, but also is compatible with different diaphragms, improves the universality and adaptability, and meets the needs of high-flexible battery cell production; on the other hand, the detection result is determined according to the resistance of the current battery cell segment and the resistance threshold range, which improves the accuracy of the detection result.

[0034] In some embodiments, the winding method further comprises: in the case that the detection result of the current battery cell segment is a second detection result, controlling a cutting mechanism of the winding device to cut off a next electrode sheet released by a target electrode sheet unwinding mechanism; wherein the cutting mechanism is located upstream of the winding mechanism, and the target electrode sheet unwinding mechanism comprises at least one of the first electrode sheet unwinding mechanism and the second electrode sheet unwinding mechanism.

[0035] In the embodiments of the present disclosure, on the one hand, the cutting mechanism is integrated in the winding device, which enriches the functions of the winding device and improves the universality and adaptability of the winding device; on the other hand, the next electrode sheet is cut off in time when there is an anomaly in the current battery cell segment, which improves the pertinence of the electrode sheet cutting process, and compared with discarding the entire battery cell, only part of the battery cell is discarded, which saves materials and reduces the manufacturing cost of the battery, and improves the production rate of the device.

[0036] In some embodiments, the winding method further comprises: controlling a material connecting mechanism of the winding device to connect the next electrode sheet to the winding mechanism to form a next battery cell; wherein the material connecting mechanism is located upstream of the cutting mechanism.

[0037] In the embodiments of the present disclosure, on the one hand, the material connecting mechanism is integrated in the winding device, which enriches the functions of the winding device and improves the universality and adaptability of the winding device; on the other hand, after the next electrode sheet is cut off, the material connecting mechanism is used to timely connect the electrode sheet, which ensures the normal production of the product and meets the production needs of high timeliness and high efficiency.

[0038] In some embodiments, the auxiliary roller mechanism comprises an auxiliary roller, a driving member and a displacement detection mechanism, and the winding method further comprises: controlling the displacement detection mechanism to detect a current distance between the auxiliary roller and the current battery cell segment; based on the current distance, controlling the driving member to drive the auxiliary roller to move, so as to reduce or increase the distance between the auxiliary roller and the current battery cell segment.

[0039] In the embodiments of the present disclosure, on the one hand, the distance between the auxiliary roller and the current battery cell segment is accurately detected by the displacement detection mechanism integrated in the auxiliary roller mechanism, so as to accurately control the movement of the auxiliary roller; on the other hand, the auxiliary roller is timely driven to move by the driving member, which ensures the normal progress of the pressing process.

[0040] In some embodiments, the winding method further comprises: controlling a pressure detection mechanism of the auxiliary roller mechanism to detect a current pressure between the auxiliary roller and the current cell segment; in a case where the current pressure is not within a pressure threshold range, controlling the driving member to drive the auxiliary roller to move based on the current pressure, so that the pressure between the auxiliary roller and the current cell segment is within the pressure threshold range.

[0041] In the embodiments of the present disclosure, on the one hand, the pressure between the auxiliary roller and the current cell segment is detected in real time by the pressure detection mechanism integrated in the auxiliary roller mechanism, so as to accurately press the current cell segment, and the possibility of poor effect due to too small pressure and deformation of the cell segment due to too large pressure is reduced; on the other hand, the auxiliary roller is controlled to move according to the current pressure, so as to improve the accuracy of the movement of the auxiliary roller.

[0042] In some embodiments, the pressure threshold range comprises a first pressure threshold and a second pressure threshold, the first pressure threshold is smaller than the second pressure threshold; and the controlling the driving member to drive the auxiliary roller to move based on the current pressure comprises: in a case where the current pressure is smaller than the first pressure threshold, controlling the driving member to drive the auxiliary roller to move close to the current cell segment until a next pressure detected by the pressure detection mechanism is within the pressure threshold range; and in a case where the current pressure is greater than the second pressure threshold, controlling the driving member to drive the auxiliary roller to move away from the current cell segment until the next pressure detected by the pressure detection mechanism is within the pressure threshold range.

[0043] In the embodiments of the present disclosure, the auxiliary roller is controlled to move according to the current voltage and the pressure threshold range, so as to not only improve the accuracy of the movement of the auxiliary roller, but also ensure that the current cell segment is within a normal pressure range.

[0044] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, rather than limiting the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0045] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the technical solutions of the present disclosure.

[0046] Figure 1 A schematic structural diagram of a winding device provided for the embodiments of the present disclosure Figure One ;

[0047] Figure 2 A schematic diagram of the positional relationship between an auxiliary roller mechanism and a winding mechanism provided for the embodiments of the present disclosure

[0048] Figure 3 A component structure schematic diagram of an auxiliary roller mechanism provided for an embodiment of the present disclosure is shown in FIG. 1.

[0049] Figure 4 A schematic diagram of detecting the connection between a terminal and a conductive piece provided for an embodiment of the present disclosure is shown in FIG. 2.

[0050] Figure 5 A component structure schematic diagram of a winding device provided for an embodiment of the present disclosure is shown in FIG. 3. Figure Two

[0051] Figure 6 A component structure schematic diagram of a winding device provided for an embodiment of the present disclosure is shown in FIG. 4. Figure Three

[0052] Figure 7 An implementation flow schematic diagram of a winding method provided for an embodiment of the present disclosure is shown in FIG. 5. Figure One

[0053] Figure 8 An implementation flow schematic diagram of a winding method provided for an embodiment of the present disclosure is shown in FIG. 6. Figure Two DETAILED DESCRIPTION

[0054] In order to make the purposes, technical solutions and advantages of the present disclosure clearer, the following will further describe the present disclosure with reference to the drawings, and the described embodiments should not be regarded as limiting the present disclosure, and all other embodiments obtained by those skilled in the art without creative labor shall fall within the scope of protection of the present disclosure.

[0055] In the following description, "some embodiments" are described, which describe a subset of all possible embodiments, but it can be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0056] In the following description, the terms "first\second\third" are only to distinguish similar objects, and do not represent a specific order of the objects, and it can be understood that "first\second\third" can interchange the specific order or sequence as allowed, so that the embodiments of the present disclosure described herein can be implemented in an order other than that illustrated or described herein.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terms used herein are only for the purpose of describing the embodiments of the present disclosure, and are not intended to limit the present disclosure.

[0058] ​​​​In the related art, new energy batteries are increasingly widely used in life and industry. New energy batteries are not only applied to energy storage power systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing. The battery can be a battery monomer. The battery monomer refers to a basic unit that can realize the mutual conversion of chemical energy and electrical energy, and can be used to make a battery module or a battery pack, thereby being used to supply power to an electrical device. The battery monomer can be a secondary battery, which refers to a battery monomer that can be activated by charging after discharging. The battery monomer can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc. The battery can also be a single physical module including one or more battery monomers to provide higher voltage and capacity. When there are multiple battery monomers, the multiple battery monomers are connected in series, parallel or mixed connection through a busbar component. The electrode tab is a main component of the monomer battery, which directly determines the electrochemical performance and safety of the battery.

[0059] The electrode tab is a main component of the monomer battery, which directly determines the electrochemical performance and safety of the battery. The electrode tab is composed of a metal current collector and a uniform coating on the metal current collector. The electrode tab is conveyed in the form of a roll during the manufacturing process to coat, roll, and cut the battery electrode tab.

[0060] The winding process is an essential process in the battery production process, and the winding process refers to winding the electrode tab and the separator to form a battery cell. Currently, the battery cell formed after the winding process is usually subjected to short circuit, open circuit test, etc. For example, the battery cell of a cylindrical battery is subjected to a short circuit test at normal temperature and pressure, and for example, the battery cell of a square battery is first hot-pressed and then subjected to a short circuit test. In this way, since multiple processes (winding, pressing, testing, etc.) are required to complete the detection of the battery cell, the detection time is increased, the detection efficiency and productivity are reduced, and in addition, since the test is performed after the battery cell is pressed, there is a possibility that some defects cannot be normally detected due to the pressure release between the electrode tab and the separator, the electrode tab and foreign matter (e.g., burrs, particles, dust, etc.), and the separator and foreign matter, resulting in poor detection effect.

[0061] This disclosure provides a winding device. Firstly, by integrating an auxiliary roller mechanism and a detection mechanism, the winding, pressurizing, and detection processes are performed simultaneously. Compared to winding first, then pressurizing, and finally detecting, this reduces the time spent on each independent process, improving production efficiency and thus increasing the device's productivity. Secondly, it improves detection effectiveness, reducing the possibility of defects being missed due to pressure relief between the electrode and separator, the electrode and foreign matter, or the separator and foreign matter. Thirdly, during the winding of the current cell segment, the auxiliary roller mechanism continuously applies pressure to the current cell segment to fully compress foreign matter, enabling accurate detection of the impact of foreign matter on the cell and reducing the risk of missed or false detections. First, it improves the battery's heat dissipation and lifespan by reducing the possibility of defective cells flowing out. Second, it integrates conductive components into the electrode unwinding mechanism, giving the mechanism conductivity. Third, by forming a current circuit between the detection mechanism, the conductive components, and the current cell segment, it can effectively detect short circuits caused by foreign objects piercing the electrode or separator, open circuits caused by current electrode breakage, etc., improving detection accuracy and comprehensiveness, thereby improving product safety and reliability. Finally, it automatically detects the current cell segment using the current of the current circuit, which improves the timeliness, accuracy, efficiency, and automation of detection results compared to manual detection, meeting the needs of high-efficiency and high-time-efficiency production.

[0062] The method provided in this disclosure can be executed by a winding device, a control device, etc. The winding device can be any suitable type and suitable for any scenario. In some embodiments, the winding device may include the control device. The control device may include, but is not limited to, at least one of a programmable logic controller (PLC), a host computer, a mid-level computer, a microcontroller, etc. In implementation, the control device may further include a processor and a memory storing processor-executable instructions; when the instructions are executed by the processor, the method provided in this disclosure is implemented.

[0063] The technical solutions in the embodiments of this disclosure will now be clearly and completely described with reference to the accompanying drawings.

[0064] Figure 1 A schematic diagram of the composition structure of a winding device provided in this embodiment of the present disclosure. Figure One ,like Figure 1 As shown, the winding equipment 10 includes a first electrode unwinding mechanism 11A, a second electrode unwinding mechanism 11B, a first diaphragm unwinding mechanism 12A, a second diaphragm unwinding mechanism 12B, a winding mechanism 13, an auxiliary roller mechanism 14, and a detection mechanism 15, wherein:

[0065] The first electrode sheet unwinding mechanism 11A is configured to release the first electrode sheet.

[0066] The second electrode sheet unwinding mechanism 11B is configured to release the second electrode sheet.

[0067] The first diaphragm unwinding mechanism 12A is configured to release the first diaphragm.

[0068] The second diaphragm unwinding mechanism 12B is configured to release the second diaphragm.

[0069] The winding mechanism 13 is configured to wind the current first electrode sheet released by the first electrode sheet unwinding mechanism, the current first diaphragm released by the first diaphragm unwinding mechanism, the current second electrode sheet released by the second electrode sheet unwinding mechanism, and the current second diaphragm released by the second diaphragm unwinding mechanism to form a current cell segment.

[0070] The auxiliary roller mechanism 14 is configured to apply pressure to the current cell segment when pressing against the surface of the current cell segment.

[0071] The detection mechanism 15 is configured to determine a detection result of the current cell segment based on the current of the current loop, wherein the current loop comprises the detection mechanism, the first conductive part of the first electrode sheet unwinding mechanism, the second conductive part of the second electrode sheet unwinding mechanism, and the current cell segment.

[0072] Here, the electrode sheet unwinding mechanism (including the first electrode sheet unwinding mechanism and the second electrode sheet unwinding mechanism) can be any suitable mechanism capable of achieving the unwinding function of the electrode sheet. In some embodiments, the electrode sheet unwinding mechanism can include an electrode sheet unwinding shaft on which the electrode sheet is wound, and in implementation, the electrode sheet unwinding shaft releases the electrode sheet when it rotates around its central axis. In some embodiments, the electrode sheet unwinding mechanism can also include an electrode sheet standby unwinding shaft, an electrode sheet unwinding device, etc. The electrode sheet standby unwinding shaft is used to release the standby electrode sheet, and the electrode sheet unwinding device is used to automatically switch the electrode sheet unwinding shaft to the electrode sheet standby unwinding shaft, i.e., to pull the tail of the electrode sheet on the electrode sheet unwinding shaft to the head of the electrode sheet standby unwinding shaft for engagement. In this way, the automatic unwinding of the electrode sheet is achieved through the unwinding device, improving the unwinding efficiency and thus the working efficiency of the winding device.

[0073] The forming material of the electrode sheet (including the first electrode sheet and the second electrode sheet) can be any suitable material, such as aluminum, nickel, copper, etc. The first electrode sheet and the second electrode sheet can be different electrode sheets. For example, the first electrode sheet can be an anode electrode sheet, and the second electrode sheet can be a cathode electrode sheet. For example, the second electrode sheet can be an anode electrode sheet, and the first electrode sheet can be a cathode electrode sheet.

[0074] In some embodiments, the electrode sheet unwinding mechanism further comprises an electrically conductive member (including a first electrically conductive member and a second electrically conductive member). The electrically conductive member can be any suitable component capable of achieving the function of electrical conduction. For example, a metal conductive roller. The material of the electrically conductive member can be any suitable material capable of achieving the function of electrical conduction. For example, stainless steel, carbon steel, aluminum, copper, etc.

[0075] In some embodiments, the electrically conductive member can be embedded in the electrode sheet unwinding mechanism, or can be arranged outside the electrode sheet unwinding mechanism, and the embodiments of the present disclosure are not limited.

[0076] The diaphragm unwinding mechanism (including a first diaphragm unwinding mechanism and a second diaphragm unwinding mechanism) can be any suitable mechanism capable of achieving the function of unwinding the diaphragm. In some embodiments, the diaphragm unwinding mechanism can comprise a diaphragm unwinding shaft on which the diaphragm is wound, and in implementation, the diaphragm unwinding shaft releases the diaphragm when it rotates around its central axis. In some embodiments, the diaphragm unwinding mechanism can further comprise a diaphragm standby unwinding shaft, a diaphragm roll changing device, etc. The diaphragm standby unwinding shaft is used to release the standby diaphragm, and the diaphragm roll changing device is used to automatically switch the diaphragm unwinding shaft to the diaphragm standby unwinding shaft, i.e., to pull the tail of the diaphragm on the diaphragm unwinding shaft to the head of the diaphragm standby unwinding shaft for engagement. In this way, the diaphragm roll changing device achieves automatic roll changing, improves roll changing efficiency, and thus improves the working efficiency of the winding device.

[0077] The diaphragm (including a first diaphragm and a second diaphragm) is also known as an isolation film, and has an insulating property. The material of the diaphragm can be any suitable material capable of achieving the isolation function, for example, PP (polypropylene) or PE (polyethylene). In some embodiments, the materials of the first diaphragm and the second diaphragm can be the same or different. In some embodiments, the first diaphragm can be an upper diaphragm, and the second diaphragm can be a lower diaphragm, to complete the wrapping of the cathode and anode sheets by the diaphragm.

[0078] In some embodiments, the width of the diaphragm is not less than the width of the electrode sheet, so that the diaphragm can completely wrap the electrode sheet, thereby achieving better insulation effect.

[0079] The winding mechanism can be any suitable mechanism capable of achieving the function of winding, for example, a winding needle. In some embodiments, the winding mechanism can comprise a winding shaft, which winds the electrode sheet and the diaphragm to form an electrode core segment when it rotates around its central axis. In some embodiments, the winding mechanism can be a hollow structure, a solid structure, etc. The cross section of the winding mechanism can be any suitable shape, for example, circular, elliptical, square, etc.

[0080] In some embodiments, the winding mechanism can first wind several turns of the separator before winding the pole piece, so as to improve the insulation effect of the battery cell.

[0081] The current battery cell section is formed by the current first pole piece, the current second pole piece, the current first separator, and the current second separator. The current first pole piece refers to the first pole piece wound by the winding mechanism at the current time, the current second pole piece refers to the second pole piece wound by the winding mechanism at the current time, the current first separator refers to the first separator wound by the winding mechanism at the current time, and the current second separator refers to the second separator wound by the winding mechanism at the current time. In some embodiments, the current battery cell section can be formed by a plurality of pole pieces and a plurality of separators, wherein the plurality of pole pieces refers to the pole pieces from a certain time to the current time, and the plurality of separators refers to the separators from a certain time to the current time. The certain time can refer to the start of winding, the previous time, etc. For example, the current battery cell section is formed by the pole pieces from the start of winding to the current time, and the separators from the start of winding to the current time.

[0082] The auxiliary roller mechanism (including other auxiliary roller mechanisms mentioned later) can be any suitable mechanism capable of achieving the pressing function. In implementation, the auxiliary roller mechanism is arranged on the periphery of the winding mechanism to press the current battery cell section. The auxiliary roller mechanism can be a hollow structure, a solid structure, etc. The cross section of the auxiliary roller mechanism can be any suitable shape, such as a circle, an ellipse, etc. In some embodiments, the shape of the cross section of the auxiliary roller mechanism is adapted to the shape of the cross section of the winding mechanism.

[0083] In some embodiments, the number of auxiliary roller mechanisms can be at least one, such as one, two, three, etc. For example, the number of auxiliary roller mechanisms is one, and the auxiliary roller mechanism can be arranged on any side of the winding mechanism, such as the right side, the upper side, etc. For another example, the number of auxiliary roller mechanisms can be two, and the two auxiliary roller mechanisms can be arranged on the periphery of the winding mechanism in a symmetrical or asymmetrical manner, etc. For example, the two auxiliary roller mechanisms are symmetrically arranged on the left and right sides of the winding mechanism. For another example, one auxiliary roller mechanism is arranged on the upper side of the winding mechanism, and the other auxiliary roller mechanism is arranged on the upper side of the winding mechanism. In some embodiments, the number of auxiliary roller mechanisms can be determined according to the size of the winding mechanism. In implementation, the number of auxiliary roller mechanisms is increased to sufficiently press the current battery cell section wound by the winding mechanism.

[0084] In some embodiments, the auxiliary roller mechanism applies a preset pressure to the current cell segment when it is attached to the surface of the current cell segment. The preset pressure can be any suitable pressure. For example, 0.2 MPa (megapascal), 0.28 MPa, etc. In some embodiments, the preset pressure can be within a pressure threshold range determined based on the material of the pole piece and the material of the diaphragm. For example, the pressure threshold range can be 0.1 MPa-0.5 MPa. For another example, the pressure threshold range can be 0.08 MPa-0.54 MPa.

[0085] In some embodiments, the auxiliary roller mechanism includes a first auxiliary roller mechanism and a second auxiliary roller mechanism symmetrically distributed; the first auxiliary roller mechanism is located on one side of the winding mechanism and is used to apply pressure to the current cell segment when it is pressed against the surface of the current cell segment; the second auxiliary roller mechanism is located on the other side of the winding mechanism and is used to apply pressure to the current cell segment after being pressed by the first auxiliary roller mechanism when it is pressed against the surface of the current cell segment.

[0086] Here, the first auxiliary roller mechanism and the second auxiliary roller mechanism can be any suitable mechanism that can achieve the pressure function. In some embodiments, the shape, structure, applied pressure, etc. of the first auxiliary roller mechanism and the second auxiliary roller mechanism can be the same or different. In implementation, the current cell segment is first pressed by the first auxiliary roller mechanism and then pressed by the second auxiliary roller mechanism to achieve sufficient pressure.

[0087] Figure 2 A schematic diagram of the position relationship between the auxiliary roller mechanism and the winding mechanism provided by the embodiments of the present disclosure is shown in FIG. 1. As shown in FIG. 1, the auxiliary roller mechanism includes a first auxiliary roller mechanism 14A and a second auxiliary roller mechanism 14B symmetrically distributed, the first auxiliary roller mechanism 14A is located on the left side of the winding mechanism 13, and the second auxiliary roller mechanism 14B is located on the right side of the winding mechanism 13. Figure 2

[0088] In the embodiments of the present disclosure, the current cell segment is pressed by two independent auxiliary roller mechanisms respectively, which not only reduces the interference between each other, but also increases the pressure duration of the current cell segment and improves the efficiency of defect detection.

[0089] In some embodiments, the auxiliary roller mechanism 14 includes an auxiliary roller and a driving member, the driving member includes a first driving member and a second driving member; the first driving member is used to drive the auxiliary roller to approach or move away from the current cell segment to reduce or increase the distance between the auxiliary roller and the current cell segment; the second driving member is used to drive the auxiliary roller to roll on the surface of the current cell segment at a target rolling speed and a target rolling direction to apply pressure to the current cell segment.

[0090] ​Here, the auxiliary roller (including other auxiliary rollers mentioned later) can be any suitable roller capable of achieving the function. The number of auxiliary rollers can be at least one, for example, one, two, etc. The auxiliary roller is in communication connection with the driving member.

[0091] In some embodiments, the width of the auxiliary roller is not less than the width of the current cell segment.

[0092] Here, the width of the auxiliary roller can refer to the axial length of the auxiliary roller. The width of the current cell segment can refer to the axial length of the cell segment wound on the winding mechanism. In implementation, the width of the auxiliary roller is greater than or equal to the width of the current cell segment, which can ensure that the pole piece is uniformly pressed, and the efficiency of defect detection is improved.

[0093] In some embodiments, if the cross section of the auxiliary roller is circular, the outer diameter of the auxiliary roller can be set according to the diameter of the cell. For example, the outer diameter of the auxiliary roller is not greater than the diameter of the cell, so as to reduce the impact of pressure on the winding mechanism, thereby prolonging the service life of the winding mechanism.

[0094] In some embodiments, the surface of the auxiliary roller is covered with a flexible substance.

[0095] Here, the flexible substance can be any suitable substance with flexible function. For example, rubber, silicone, carbon fiber, elastic polyurethane. In some embodiments, the flexible substance can be integrally formed with the auxiliary roller, or the flexible substance can be wrapped around the auxiliary roller. In this way, by covering the surface of the auxiliary roller with a flexible substance, the wear resistance and smoothness of the auxiliary roller are effectively improved, thereby prolonging the service life of the auxiliary roller, reducing the possibility of scratching and scratching the cell due to rough surface, and enhancing the protection of the cell.

[0096] The driving member (including the first driving member, the second driving member, and other driving members mentioned later) can be any suitable component capable of achieving the driving function. For example, motor, air cylinder, motor, etc. The first driving member is mainly used to drive the auxiliary roller to move, so as to approach or move away from the current cell segment. The first driving member can include but is not limited to motor, air cylinder, etc. The second driving member is mainly used to drive the auxiliary roller to roll (or rotate) on the surface of the current cell segment when the auxiliary roller is attached to the current cell segment, so as to apply pressure to the current cell segment. The second driving member can include but is not limited to motor, motor, etc.

[0097] The target rolling speed can be the same as the winding speed of the winding mechanism. The target rolling direction can be opposite to the winding direction of the winding mechanism. In some embodiments, when the number of auxiliary rollers is at least two, the target rolling direction of at least one auxiliary roller is opposite to the winding direction, so as to ensure that the pole piece and the separator are in a pressed state, and the possibility of winding abnormality is reduced.

[0098] In the embodiments of the present disclosure, on the one hand, the first driving member drives the auxiliary roller to move close to or away from the current cell segment, ensuring the normal progress of the pressing process; on the other hand, the second driving member drives the auxiliary roller to roll at the same rolling speed as the winding speed of the winding device and in the opposite rolling direction to the winding direction, ensuring that the pole piece and the separator are in a continuous pressing state, thereby improving the efficiency of defect detection.

[0099] In some embodiments, the auxiliary roller mechanism 14 further comprises a pressure detection mechanism and a displacement detection mechanism; the displacement detection mechanism is configured to detect the current distance between the auxiliary roller and the current cell segment; the first driving member is further configured to drive the auxiliary roller to move based on the current distance detected by the displacement detection mechanism; the pressure detection mechanism is configured to detect the current pressure between the auxiliary roller and the current cell segment; and the first driving member is further configured to drive the auxiliary roller to move so that the pressure between the auxiliary roller and the current cell segment is within the pressure threshold range when the current pressure is not within the pressure threshold range.

[0100] Here, the displacement detection mechanism can be any suitable mechanism capable of displacement detection. For example, a displacement sensor. In some embodiments, the displacement detection mechanism can be arranged on one side of the first driving member or the auxiliary roller to detect the distance between the auxiliary roller and the cell segment in real time. In some embodiments, the number of displacement detection mechanisms is adapted to the number of auxiliary rollers. For example, if the number of auxiliary rollers is one, the number of displacement detection mechanisms can also be one. For another example, if the number of auxiliary rollers is two, the number of displacement detection mechanisms can also be two.

[0101] In some embodiments, the first driving member is connected to the auxiliary roller and the displacement detection mechanism respectively, and is configured to drive the auxiliary roller to move close to or away from the cell segment. During winding, since the diameter of the current cell segment wound by the winding mechanism is changing, the distance detected by the displacement detection mechanism in real time is also changing, and therefore the first driving member is required to drive the auxiliary roller to move to ensure that the distance between the auxiliary roller and the current cell segment is appropriate, thereby reducing the possibility of winding abnormalities.

[0102] The pressure detection mechanism can be any suitable mechanism capable of pressure detection, such as a pressure sensor. In some embodiments, the pressure detection mechanism can be disposed in the auxiliary roller to detect the pressure between the auxiliary roller and the cell segment. In some embodiments, the number of pressure detection mechanisms can be at least one, and the number of pressure detection mechanisms is adapted to the number of auxiliary rollers. For example, if there is only one auxiliary roller, then there can be at least one pressure detection mechanism. For instance, if there are two pressure detection mechanisms, each used to detect the pressure between each end of the auxiliary roller and the cell segment, this ensures that the pressure deviation applied to each end of the auxiliary roller is not too large, thereby improving the accuracy of pressure application.

[0103] In some embodiments, the second drive element is connected to both the auxiliary roller and the pressure detection mechanism to apply pressure to the cell segment.

[0104] The pressure threshold range can be any suitable range. In some embodiments, the pressure threshold range is determined based on the material of the electrode and the material of the separator. In some embodiments, the pressure threshold range may include a first pressure threshold and a second pressure threshold, where the first pressure threshold is less than the second pressure threshold. In some embodiments, if the current pressure is less than the first pressure threshold, it indicates that the current pressure is too low, and the distance between the auxiliary roller and the current cell segment needs to be reduced. In implementation, the first driving member can be used to drive the auxiliary roller closer to the current cell segment to prevent the cell from becoming loose or uneven. If the current pressure is greater than the second pressure threshold, it indicates that the current pressure is too high, and the distance between the auxiliary roller and the current cell segment needs to be increased. In implementation, the first driving member can be used to drive the auxiliary roller away from the current cell segment to prevent the cell from becoming deformed or wrinkled. During the driving of the auxiliary roller, the pressure between the auxiliary roller and the current cell segment is detected in real time by the pressure detection mechanism until the pressure detected by the pressure detection mechanism is within the pressure threshold range.

[0105] Figure 3 This is a schematic diagram of the composition structure of an auxiliary roller mechanism provided in an embodiment of the present disclosure, as shown below. Figure 3 As shown, the auxiliary roller mechanism includes an auxiliary roller 141, a driving member, a displacement detection mechanism 143, and a pressure detection mechanism 144. The driving member includes a first driving member 1421 and a second driving member 1422. There are two pressure detection mechanisms 144, which are used to detect the pressure between each end of the auxiliary roller 141 and the current cell segment.

[0106] In the embodiments of the present disclosure, on the one hand, the distance between the auxiliary roller and the current cell segment is accurately detected by the displacement detection mechanism integrated in the auxiliary roller mechanism, so as to accurately control the movement of the auxiliary roller; on the other hand, the pressure between the auxiliary roller and the current cell segment is detected in real time by the pressure detection mechanism integrated in the auxiliary roller mechanism, so as to accurately pressurize the current cell segment, and the possibility of poor effect due to too small pressure and cell segment deformation due to too large pressure is reduced.

[0107] The detection mechanism can be any suitable mechanism capable of achieving the detection function. For example, a current detection device, a resistance detection device, etc. In some embodiments, the number of detection mechanisms can be at least one. The detection structure at least includes a detection terminal and a detector, the number of detection terminals can be at least two, and the detector can be any suitable instrument capable of achieving the detection function, such as a current detector, a resistance detector, etc. For example, the detection mechanism includes a first detection terminal and a second detection terminal, the first detection terminal is connected to the first conductive part of the first pole piece winding mechanism, and the second detection terminal is connected to the second conductive part of the second pole piece winding mechanism. A loop is formed between the first detection terminal, the first conductive part, the cell segment, the second conductive part, the second detection terminal and the detector.

[0108] Figure 4 A connection diagram between a detection terminal and a conductive part provided by an embodiment of the present disclosure is shown in FIG. 1, wherein the detection terminal 151 of the detection mechanism is connected to the end of the first conductive part 111 of the first pole piece unwinding mechanism. Figure 4

[0109] The detection result can include but is not limited to a first detection result, a second detection result, etc. The first detection result indicates that the current cell segment does not have defects. The second detection result indicates that the current cell segment has defects, such as pole piece strip, pole piece rupture, and diaphragm puncture.

[0110] In some embodiments, the determination method of the detection result can include but is not limited to current, resistance, etc. The resistance is determined based on the current and a detection voltage, and the detection voltage is determined based on the diaphragm. In practice, because the materials of different diaphragms are different, the puncture voltage they can withstand may also be different. The determination method of the resistance can include but is not limited to the ratio between the detection voltage and the current, and the weighted value of the ratio.

[0111] ​For example, if the current is within the current threshold range, the first detection result is taken as the detection result of the current cell segment; if the current is not within the current threshold range, the second detection result is taken as the detection result of the current cell segment. In implementation, if the current loop is in normal state, the current should be within the current threshold range; if the current loop is in open circuit state (e.g. caused by broken tab), the current should be less than the minimum current (i.e. the minimum value of the current threshold range); if the current loop is in short circuit state (e.g. caused by puncture of the separator), the current should be greater than the maximum current (i.e. the maximum value of the current threshold range).

[0112] For example, if the resistance is within the resistance threshold range, the first detection result is taken as the detection result of the current cell segment; if the resistance is not within the resistance threshold range, the second detection result is taken as the detection result of the current cell segment. In implementation, if the current loop is in normal state, the resistance should be within the resistance threshold range; if the current loop is in open circuit state (e.g. caused by broken tab), the resistance should be greater than the maximum resistance (i.e. the maximum value of the resistance threshold range); if the current loop is in short circuit state (e.g. caused by puncture of the separator), the resistance should be less than the minimum resistance (i.e. the minimum value of the resistance threshold range).

[0113] In some embodiments, the detection mechanism or the winding device further comprises a prompting device. The prompting device can be any suitable device, such as an indicator light, a buzzer, etc. In implementation, if the detection result of the current cell segment is the second detection result, the prompting device is prompted to facilitate timely processing by the staff.

[0114] In some embodiments, the winding device 10 further comprises a cutting mechanism; the cutting mechanism is located upstream of the winding mechanism and is used to cut off the next tab released by the target tab unwinding mechanism if the detection result of the current cell segment is the second detection result.

[0115] Here, the cutting mechanism (including other cutting mechanisms mentioned later) can be any suitable mechanism capable of achieving the cutting function. For example, a cutter, a cutting head, etc. The cutting mechanism is located upstream of the winding mechanism and is mainly used to cut off the next tab in time when the cell segment has defects such as broken tab and short circuit. The next tab (including the next first tab and the next second tab) refers to the tab released by the target tab unwinding mechanism after the current tab. In some embodiments, the cutting mechanism is also used to cut off the tab when the entire cell is normally wound to facilitate the formation of the next cell.

[0116] The target electrode sheet unwinding mechanism can include at least one of the first electrode sheet unwinding mechanism and the second electrode sheet unwinding mechanism. For example, in a case where the second detection result indicates that the first electrode sheet has a crack, a broken belt, or the like, the first electrode sheet unwinding mechanism is taken as the target electrode sheet unwinding mechanism. For another example, in a case where the second detection result indicates that the second electrode sheet has a crack, a broken belt, or the like, the second electrode sheet unwinding mechanism is taken as the target electrode sheet unwinding mechanism. For yet another example, in a case where the second detection result indicates that the separator is punctured, both the first electrode sheet unwinding mechanism and the second electrode sheet unwinding mechanism are taken as the target electrode sheet unwinding mechanism.

[0117] In some embodiments, the number of the cutting mechanisms can be at least one. In implementation, the number of the cutting mechanisms can be adapted to the number of the electrode sheet unwinding mechanisms. For example, the number of the cutting mechanisms is one, and the next first electrode sheet and the next second electrode sheet are both cut off by the cutting mechanism. For another example, the number of the cutting mechanisms can also be two, one cutting mechanism is located between the first electrode sheet unwinding mechanism and the winding mechanism, and is used to cut off the next first electrode sheet, and the other cutting mechanism is located between the second electrode sheet unwinding mechanism and the winding mechanism, and is used to cut off the next second electrode sheet, so that different electrode sheets are cut by different cutting mechanisms, improving the pertinence and accuracy of the cutting process.

[0118] In this way, on the one hand, the cutting mechanism is integrated in the winding device, enriching the functions of the winding device, and thus improving the versatility and adaptability of the winding device; on the other hand, the next electrode sheet is cut off in time when the current cell segment has an abnormality, improving the pertinence of the electrode sheet cutting process, and compared with subsequent invalidation of the entire cell, only part of the cell is invalidated, achieving the purpose of saving materials, and thus reducing the manufacturing cost of the battery and improving the production rate of the device.

[0119] In some embodiments, the winding device 10 further includes a receiving mechanism; the receiving mechanism is located upstream of the cutting mechanism, and is used to connect the next electrode sheet cut off to the winding mechanism to form the next cell.

[0120] Here, the receiving mechanism (including other receiving mechanisms mentioned later) can be any suitable mechanism that can realize the receiving function. For example, a receiving plate and the like. The receiving plate is located upstream of the cutting mechanism and downstream of the unwinding mechanism. The receiving plate is mainly used to limit and guide the electrode sheet to the winding mechanism. In implementation, after the next electrode sheet (including the next first electrode sheet and / or the next second electrode sheet) is cut off by the cutting mechanism, the next electrode sheet is received by the receiving mechanism to the winding mechanism.

[0121] In some embodiments, the number of the receiving mechanisms can be at least one. In implementation, the number of the receiving mechanisms can be adapted to the number of the cutting mechanisms. For example, if the number of the cutting mechanisms is two, the number of the receiving mechanisms can also be two, one receiving mechanism is located between the first anode tab unwinding mechanism and the first cutting mechanism for receiving the next anode tab into the winding mechanism, and the other receiving mechanism is located between the second anode tab unwinding mechanism and the second cutting mechanism for receiving the next cathode tab into the winding mechanism, so that different receiving mechanisms are used to receive different next tabs into the winding mechanism, improving the specificity and accuracy of the receiving.

[0122] In this way, on the one hand, the receiving mechanism is integrated in the winding device, enriching the functions of the winding device, and thus improving the versatility and adaptability of the winding device; on the other hand, after cutting the next tab, the receiving mechanism is used to timely receive the tab, ensuring the normal production of the product to meet the high-time and high-efficiency production requirements.

[0123] Figure 5 A schematic diagram of a winding device according to an embodiment of the present disclosure Figure Two As shown in Figure 5 The winding device includes an anode tab unwinding mechanism 11A (corresponding to the first tab unwinding mechanism), a cathode tab unwinding mechanism 11B (corresponding to the second tab unwinding mechanism), an upper separator unwinding mechanism 12A (corresponding to the first separator unwinding mechanism), a lower separator unwinding mechanism 12B (corresponding to the second separator unwinding mechanism), a winding mechanism 13, an auxiliary roller mechanism, a detection mechanism, a first cutting mechanism 161, a second cutting mechanism 162, a first receiving mechanism 171, a second receiving mechanism 172, a first driving roller 181, and a second driving roller 182. The auxiliary roller mechanism includes a first driving member 141, a second driving member (not shown in the figure), and an auxiliary roller 142. The detection mechanism includes a first detection terminal 151, a second detection terminal 152, and a detector 153. Wherein:

[0124] The number of the first driving roller 181 can be at least one, which is used to drive the transmission of the anode tab;

[0125] The number of the second driving roller 182 can be at least one, which is used to drive the transmission of the cathode tab;

[0126] The winding mechanism 13 is used to wind the anode tab released by the anode tab unwinding mechanism 11A, the upper separator released by the upper separator unwinding mechanism 12A, the cathode tab released by the cathode tab unwinding mechanism 11B, and the lower separator released by the lower separator unwinding mechanism 12B to form a cell segment;

[0127] The first driving member 141 is configured to drive the auxiliary roller 142 to move close to or away from the cell segment during winding of the cell segment by the winding mechanism 13;

[0128] The second driving member is configured to drive the auxiliary roller 142 to roll on the surface of the cell segment in a rolling direction opposite to the winding direction at a rolling speed same as the winding speed when the auxiliary roller 142 is attached to the surface of the cell segment;

[0129] The first detection terminal 151 is connected with the first conductive member 111 of the anode tab unwinding mechanism 11A, and the second detection terminal 152 is connected with the second conductive member 112 of the cathode tab unwinding mechanism 11B. The detector 153, the first detection terminal 151, the first conductive member 111, the cell segment, the second conductive member 112 and the second detection terminal 152 form a loop;

[0130] The detector 153 is configured to determine the resistance of the cell segment according to the current of the loop, and determine the detection result of the cell segment according to the resistance of the cell segment;

[0131] The first cutting mechanism 161 is configured to cut off the next anode tab released by the anode tab unwinding mechanism 11A when the detection result of the cell segment indicates that the cell segment has defects or the current cell winding is completed;

[0132] The first cutting mechanism 161 is configured to cut off the next anode tab released by the anode tab unwinding mechanism 11A when the detection result of the cell segment indicates that the cell segment has defects or the current cell winding is completed;

[0133] The second cutting mechanism 162 is configured to cut off the next cathode tab released by the cathode tab unwinding mechanism 11B when the detection result of the cell segment indicates that the cell segment has defects or the current cell winding is completed;

[0134] The second cutting mechanism 162 is configured to cut off the next cathode tab released by the cathode tab unwinding mechanism 11B when the detection result of the cell segment indicates that the cell segment has defects or the current cell winding is completed.

[0135] Figure 6 A component structure of a winding device provided by the embodiment of the present disclosure Figure Three As Figure 6As shown, the winding device comprises an anode electrode tab unwinding mechanism 11A, a cathode electrode tab unwinding mechanism 11B, an upper separator unwinding mechanism 12A, a lower separator unwinding mechanism 12B, a winding mechanism 13, a first auxiliary roller mechanism 14A, a second auxiliary roller mechanism 14B, a detection mechanism 15, a first cutting mechanism 161, a second cutting mechanism 162, a first receiving mechanism 171, a second receiving mechanism 172, a first driving roller 181, and a second driving roller 182. The first auxiliary roller mechanism 14A comprises a third driving member 141A (corresponding to the first driving member described above), a fourth driving member (corresponding to the second driving member described above, not shown in the figure), and a first auxiliary roller 142A. The second auxiliary roller mechanism 14B comprises a fifth driving member 141B (corresponding to the first driving member described above), a sixth driving member (corresponding to the second driving member described above, not shown in the figure), and a second auxiliary roller 142B. The detection mechanism 15 comprises a first detection terminal 151, a second detection terminal 152, and a detector 153. Wherein:

[0136] The number of the first driving roller 181 can be at least one, for driving the transmission of the anode electrode tab;

[0137] The number of the second driving roller 182 can be at least one, for driving the transmission of the cathode electrode tab;

[0138] The winding mechanism 13 is used for winding the anode electrode tab released by the anode electrode tab unwinding mechanism 11A, the upper separator released by the upper separator unwinding mechanism 12A, the cathode electrode tab released by the cathode electrode tab unwinding mechanism 11B, and the lower separator released by the lower separator unwinding mechanism 12B, to form a battery cell segment;

[0139] The third driving member 141A is used for driving the first auxiliary roller 142A to move close to or away from the battery cell segment;

[0140] The fourth driving member is used for driving the first auxiliary roller 142A to roll on the surface of the battery cell segment at the same rolling speed as the winding speed and in the opposite rolling direction when the first auxiliary roller 142A is attached to the surface of the battery cell segment;

[0141] The fifth driving member 142A is used for driving the second auxiliary roller 142B to move close to or away from the battery cell segment;

[0142] The sixth driving member is used for driving the second auxiliary roller 142B to roll on the surface of the battery cell segment at the same rolling speed as the winding speed and in the opposite or same rolling direction when the second auxiliary roller 142B is attached to the surface of the battery cell segment;

[0143] The first detection terminal 151 is connected with the first conductive piece 111 of the anode pole piece unwinding mechanism 11A, and the second detection terminal 152 is connected with the second conductive piece 112 of the cathode pole piece unwinding mechanism 11B. The detector 153, the first detection terminal 151, the first conductive piece 111, the battery cell segment, the second conductive piece 112 and the second detection terminal 152 form a loop;

[0144] The detector 153 is configured to determine the resistance of the battery cell segment according to the current of the loop, and determine the detection result of the battery cell segment according to the resistance of the battery cell segment.

[0145] The first cutting mechanism 161 is configured to cut off the next anode pole piece released by the anode pole piece unwinding mechanism 11A when the detection result of the battery cell segment indicates that the battery cell segment has defects or the current battery cell winding is completed.

[0146] The first cutting mechanism 161 is configured to cut off the next anode pole piece released by the anode pole piece unwinding mechanism 11A when the detection result of the battery cell segment indicates that the battery cell segment has defects or the current battery cell winding is completed.

[0147] The second cutting mechanism 162 is configured to cut off the next cathode pole piece released by the cathode pole piece unwinding mechanism 11B when the detection result of the battery cell segment indicates that the battery cell segment has defects or the current battery cell winding is completed.

[0148] The second cutting mechanism 162 is configured to cut off the next cathode pole piece released by the cathode pole piece unwinding mechanism 11B when the detection result of the battery cell segment indicates that the battery cell segment has defects or the current battery cell winding is completed.

[0149] In this embodiment, firstly, an auxiliary roller mechanism and a detection mechanism are integrated into the winding equipment, enabling the simultaneous execution of the three processes of winding, pressurizing, and detection. Compared to winding first, then pressurizing, and finally detecting, this approach reduces the time spent on each independent process, improving production efficiency and thus increasing equipment productivity. Furthermore, it improves detection effectiveness, reducing the possibility of defects going undetected due to pressure relief between the electrode and diaphragm, the electrode and foreign matter (e.g., burrs, particles, dust), or the diaphragm and foreign matter. Secondly, during the winding of the current cell segment, the auxiliary roller mechanism continuously applies pressure to the current cell segment to fully compress foreign matter, accurately detecting the impact of foreign matter on the cell and reducing missed detections. The possibility of false detection is reduced, thus lowering the likelihood of defective cells leaving the battery and ensuring heat dissipation and lifespan. Secondly, the integration of conductive components into the electrode unwinding mechanism gives it conductivity. Then, by forming a current circuit between the detection mechanism, the conductive components, and the current cell segment, short circuits caused by foreign objects piercing the electrode or separator, and open circuits caused by current electrode breakage, can be effectively detected, improving detection accuracy and comprehensiveness, thereby enhancing product safety and reliability. Finally, the current in the current circuit is used to automatically detect the current cell segment, which, compared to manual detection, improves the timeliness, accuracy, efficiency, and automation of the detection results, meeting the demands of high-efficiency and high-time-sensitivity production.

[0150] Based on the above embodiments, this disclosure also provides a winding method, which is applied in a control device. Figure 7 A schematic diagram of the implementation process of a winding method provided in this embodiment of the present disclosure. Figure One ,like Figure 7 As shown, the winding method includes steps S71 to S72, wherein:

[0151] Step S71: Control the auxiliary roller mechanism of the winding equipment to apply pressure to the current cell segment when it presses against the surface of the current cell segment; wherein, the winding equipment further includes a first electrode unwinding mechanism, a second electrode unwinding mechanism, a first diaphragm unwinding mechanism, a second diaphragm unwinding mechanism, a winding mechanism and a detection mechanism, and the current cell segment is formed by the winding mechanism winding the current first electrode released by the first electrode unwinding mechanism, the current first diaphragm released by the first diaphragm unwinding mechanism, the current second electrode released by the second electrode unwinding mechanism and the current second diaphragm released by the second diaphragm unwinding mechanism.

[0152] Here, the control device can be any suitable device capable of performing control functions, such as a host computer, a PLC, or a host computer + PLC. In some embodiments, the control device can be located within the winding equipment or can be independent of the winding equipment. The control device is communicatively connected to the winding equipment. The winding equipment can be any of the winding equipment described above.

[0153] The control device can send a control signal to control the auxiliary roller mechanism to move to apply pressure to the current cell segment. The control signal can be any suitable signal mainly used to control the movement of the auxiliary roller mechanism. The applied pressure should be within a pressure threshold range.

[0154] In some embodiments, the control device is also used to control the first tab unwinding mechanism, the second tab unwinding mechanism, the first separator unwinding mechanism, the second separator unwinding mechanism, the winding mechanism, etc. When winding each cell, the winding mechanism can be controlled to wind a certain number of turns of the separator first, and then the winding mechanism is controlled to wind the cell segment.

[0155] The length of the current cell segment is not greater than the length of the cell, and the current cell segment refers to a part of a cell.

[0156] Step S72, determining a detection result of the current cell segment based on the current, wherein the current loop includes the detection mechanism, the first conductive part of the first tab unwinding mechanism, the second conductive part of the second tab unwinding mechanism, and the current cell segment.

[0157] Here, the detection result can include but is not limited to a first detection result, a second detection result, etc. The first detection result indicates that the current cell segment has no defects. The second detection result indicates that the current cell segment has defects, such as tab breakage, tab rupture, and separator puncture.

[0158] The determination method of the detection result can include but is not limited to the current, resistance, etc. The resistance is determined based on the current. For example, the detection result is determined according to the current and a current threshold range, i.e., if the current is within the current threshold range, the first detection result is taken as the detection result; otherwise, if the current is not within the current threshold range, the second detection result is taken as the detection result. For another example, the detection result is determined according to the resistance and a resistance threshold range, i.e., if the resistance is within the resistance threshold range, the first detection result is taken as the detection result; otherwise, if the resistance is not within the resistance threshold range, the second detection result is taken as the detection result.

[0159] In some embodiments, the detection mechanism can transmit the current to the control device, so that the control device determines the detection result according to the current. In implementation, the detection mechanism can be in communication connection with the control device, or can be in communication connection with the winding device.

[0160] In the embodiments of the present disclosure, firstly, the auxiliary roller mechanism and the detection mechanism are integrated in the winding device, so that the winding, pressing and detection processes are carried out at the same time. Compared with winding first, pressing second and detection last, on the one hand, the time of each independent process is reduced, the production efficiency is improved, so that the production rate of the device is improved, on the other hand, the detection effect is improved, and the possibility of not detecting defects due to the pressure relief between the pole piece and the diaphragm, the pole piece and the foreign matter (for example, burr, particle, dust, etc.), and the diaphragm and the foreign matter is reduced; secondly, in the process of winding the current battery cell segment, the auxiliary roller mechanism continuously presses the current battery cell segment to sufficiently extrude the foreign matter, so that the influence of the foreign matter on the battery cell can be accurately detected, the possibility of missed detection and false detection is reduced, so that the possibility of defective battery cell flowing out is reduced, and the heat dissipation and service life of the battery are ensured; thirdly, the conductive part is integrated in the pole piece unwinding mechanism, so that the pole piece unwinding mechanism has the conductive property; then, the current loop is formed between the detection mechanism, the conductive part and the current battery cell segment, so that the short circuit caused by the foreign matter piercing the pole piece or the diaphragm, the open circuit caused by the current pole piece fracture, etc. can be effectively detected, the detection accuracy and comprehensiveness are improved, and the safety and reliability of the product are improved; finally, the current battery cell segment is automatically detected by the current of the current loop, compared with manual detection, the timeliness, accuracy, detection efficiency and automation degree of the detection result are improved, and the production demand of high timeliness and high efficiency can be met.

[0161] In some embodiments, the step S72 comprises steps S721 to S723, wherein:

[0162] Step S721, determining the resistance of the current battery cell segment based on the current of the current loop and the current detection voltage.

[0163] Here, the current detection voltage can be any suitable detection voltage, for example, 50V (volt, abbreviated as V), 100V, etc. In some embodiments, the current detection voltage is determined based on the current diaphragm, and different diaphragms can correspond to different detection voltages. The current detection voltage can be provided by the detection mechanism, and the detection mechanism can provide a suitable voltage detection range, for example, 40V-600V, 50V-500V.

[0164] The determination method of the resistance can include but is not limited to the ratio between the current detection voltage and the current, the weighting of the ratio, etc. For example, the ratio is taken as the resistance.

[0165] Step S722, in the case that the resistance of the current battery cell segment is within the resistance threshold range, taking the first detection result as the detection result of the current battery cell segment.

[0166] Here, the resistance threshold range can be any suitable range. For example, 1MΩ (mega-ohm) to 1.3MΩ. In implementation, different battery cells can correspond to different resistance threshold ranges. In implementation, if the current loop is in a normal state at this time, that is, the resistance is within the resistance threshold range, then the first detection result can be taken as the detection result of the current battery cell segment.

[0167] Step S723, in the case where the resistance of the current battery cell segment is not within the resistance threshold range, taking the second detection result as the detection result of the current battery cell segment.

[0168] Here, if the current loop is in an open circuit state (for example, due to a broken tab), at this time, the resistance will be much larger than the maximum resistance (i.e., the maximum value of the resistance threshold range), and if the current loop is in a short circuit state (for example, due to a punctured separator causing the negative and positive tabs to be short-circuited), at this time, the resistance is relatively small, which will be much smaller than the minimum resistance (i.e., the minimum value of the resistance threshold range), then the second detection result can be taken as the detection result of the current battery cell segment.

[0169] In the embodiments of the present disclosure, on the one hand, the current detection voltage is determined according to the current separator, not only improving the accuracy of the current detection voltage, but also being compatible with different separators, improving the universality and adaptability, and being able to meet the needs of high-flexibility battery cell production; on the other hand, the detection result is determined according to the resistance of the current battery cell segment and the resistance threshold range, improving the accuracy of the detection result.

[0170] In some embodiments, the auxiliary roller mechanism includes an auxiliary roller, a driving member, and a displacement detection mechanism, and the winding method further includes steps S731 to S732, wherein:

[0171] Step S731, controlling the displacement detection mechanism to detect the current distance between the auxiliary roller and the current battery cell segment.

[0172] Here, the current distance can be any suitable distance. In some embodiments, the control device can transmit a displacement detection signal to the displacement detection mechanism, so that the displacement detection mechanism detects the current distance between the auxiliary roller and the current battery cell segment based on the displacement detection signal. The displacement detection signal can be any suitable signal for detecting displacement. In this way, compared with real-time detection, the number of detections is reduced, and the hardware consumption is reduced.

[0173] In some embodiments, the displacement detection mechanism transmits the current distance to the control device. The displacement detection mechanism and the control device can be directly communicatively connected, or can be communicatively connected through the driving member, that is, the displacement detection mechanism and the driving member are connected, and the driving member and the control device are connected.

[0174] Step S732, based on the current distance, control the driving member to drive the auxiliary roller to move, so as to reduce or increase the distance between the auxiliary roller and the current cell section.

[0175] Here, according to the current distance, the distance between the auxiliary roller and the current cell section is adjusted. In implementation, the control device can send a corresponding driving signal to the driving member, so that the driving member drives the auxiliary roller to move according to the driving signal. For example, if the current distance indicates that the auxiliary roller should move away from the current cell section, at this time, the control device sends an away driving signal to the driving member, so that the driving member drives the auxiliary roller to move away from the current cell section according to the away driving signal; for another example, if the current distance indicates that the auxiliary roller should move close to the current cell section, at this time, the control device sends a close driving signal to the driving member, so that the driving member drives the auxiliary roller to move close to the current cell section according to the close driving signal.

[0176] In some embodiments, after the winding mechanism is controlled to wind the separator for several turns, the driving member is controlled to drive the auxiliary roller to move and be attached to the surface of the current cell section.

[0177] In the embodiments of the present disclosure, on the one hand, the distance between the auxiliary roller and the current cell section is accurately detected by the displacement detection mechanism integrated in the auxiliary roller mechanism, so as to accurately control the movement of the auxiliary roller; on the other hand, the driving member is controlled to timely drive the auxiliary roller to move, so as to ensure the normal progress of the pressing process.

[0178] In some embodiments, the winding method further comprises steps S741 to S742, wherein:

[0179] Step S741, control the pressure detection mechanism of the auxiliary roller mechanism to detect the current pressure between the auxiliary roller and the current cell section.

[0180] Here, the current pressure can be any suitable pressure. In some embodiments, the control device can transmit a pressure detection signal to the pressure detection mechanism, so that the pressure detection mechanism detects the current pressure between the auxiliary roller and the current cell section based on the pressure detection signal. The pressure detection signal can be any suitable signal for detecting pressure. In this way, compared with real-time detection, the number of detections is reduced, and the hardware consumption is reduced.

[0181] In some embodiments, the pressure detection mechanism transmits the current pressure to the control device. The pressure detection mechanism and the control device can be directly connected in communication, or can be connected in communication through the driving member, that is, the pressure detection mechanism and the driving member are connected, and the driving member and the control device are connected.

[0182] Step S742, in a case where the current pressure is not within the pressure threshold range, based on the current pressure, controlling the driving member to drive the auxiliary roller to move, so that the pressure between the auxiliary roller and the current cell segment is within the pressure threshold range.

[0183] Here, the pressure threshold range can be any suitable range. In some embodiments, the pressure threshold range is determined based on the material of the tab and the material of the separator. In implementation, the control device adjusts the distance between the auxiliary roller and the current cell segment according to the current pressure. In implementation, the control device can send a corresponding driving signal to the driving member, so that the driving member drives the auxiliary roller to move according to the driving signal.

[0184] In some embodiments, the pressure threshold range includes a first pressure threshold and a second pressure threshold, the first pressure threshold is less than the second pressure threshold; the "controlling the driving member to drive the auxiliary roller to move based on the current pressure" in step S742 includes step S7421 and / or step S7422, wherein:

[0185] Step S7421, in a case where the current pressure is less than the first pressure threshold, controlling the driving member to drive the auxiliary roller to move closer to the current cell segment until the next pressure detected by the pressure detection mechanism is within the pressure threshold range.

[0186] Here, the first pressure threshold can be any suitable pressure value. In implementation, if the current pressure is less than the first pressure threshold, it indicates that the current pressure is too small, and the distance between the auxiliary roller and the current cell segment needs to be reduced. The control device can send a corresponding driving signal to the driving member, so that the driving member drives the auxiliary roller to move closer to the current cell segment until the next pressure is within the pressure threshold range, to prevent the cell from being loose, irregular, etc. In some embodiments, the distance between the auxiliary roller and the current cell segment can be adjusted step by step to gradually adjust the pressure value between the two, until the pressure between the two is within the pressure threshold range.

[0187] Step S7422, in a case where the current pressure is greater than the second pressure threshold, controlling the driving member to drive the auxiliary roller to move away from the current cell segment until the next pressure detected by the pressure detection mechanism is within the pressure threshold range.

[0188] Here, the second pressure threshold value can be any suitable pressure value. In implementation, when the current pressure is greater than the second pressure threshold value, it indicates that the current pressure is too large, and the distance between the auxiliary roller and the current cell segment needs to be increased. The control device can send a corresponding driving signal to the driving member to drive the auxiliary roller away from the current cell segment until the next pressure is within the pressure threshold range, so as to prevent the cell from deforming, wrinkling, etc. In some embodiments, the distance between the auxiliary roller and the current cell segment can be adjusted step by step to gradually adjust the pressure value between the two, until the pressure between the two is within the pressure threshold range.

[0189] In this way, the auxiliary roller movement is controlled according to the current voltage and the pressure threshold range, which not only improves the accuracy of the auxiliary roller movement, but also ensures that the current cell segment is within the normal pressure range.

[0190] In the embodiments of the present disclosure, on the one hand, the pressure detection mechanism integrated in the auxiliary roller mechanism is used to detect the pressure between the auxiliary roller and the current cell segment in real time, so as to accurately press the current cell segment and reduce the possibility of poor effect due to too small pressure and cell segment deformation due to too large pressure; on the other hand, the auxiliary roller movement is controlled according to the current pressure, which improves the accuracy of the auxiliary roller movement.

[0191] In some embodiments, when the detection result of the current cell segment is the second detection result, and / or when the cell winding is completed, the winding method further includes step S75, wherein:

[0192] Step S75, controlling the cutting mechanism of the winding device to cut off the next pole piece released by the target pole piece unwinding mechanism.

[0193] Here, the cutting mechanism can be any suitable mechanism that can realize the cutting function. For example, a cutter, a cutting head, etc. The number of cutting mechanisms can be at least one. The cutting mechanism is located upstream of the winding mechanism.

[0194] The target pole piece unwinding mechanism includes at least one of the first pole piece unwinding mechanism and the second pole piece unwinding mechanism.

[0195] In some embodiments, the cutting mechanism and the control device can be directly connected in communication, or can be connected in communication through the winding device and the control device. In implementation, the control device sends a cutting signal to the cutting mechanism according to the second detection result transmitted by the winding device and / or the cell completion signal, so that the cutting mechanism cuts off the next pole piece in time based on the cutting signal.

[0196] The cell completion signal can be any suitable signal representing completion of winding of the current cell. In some embodiments, the cell completion signal can be generated when the length of the cell segment wound by the winding mechanism is equal to the length of one cell, so that the cutting mechanism timely cuts off the next pole piece.

[0197] In some embodiments, the cutting mechanism comprises a first cutting mechanism and a second cutting mechanism, and the step S75 comprises a step S751 and / or a step S752, wherein:

[0198] The step S751 comprises controlling the first cutting mechanism to cut off the next first pole piece released by the first pole piece unwinding mechanism.

[0199] Here, when the detection result of the current cell segment is the second detection result and / or the cell winding is completed, the control device sends a cutting signal to the first cutting mechanism, so that the first cutting mechanism timely cuts off the next first pole piece based on the cutting signal.

[0200] The step S272 comprises controlling the second cutting mechanism to cut off the next second pole piece released by the second pole piece unwinding mechanism.

[0201] Here, when the detection result of the current cell segment is the second detection result and / or the cell winding is completed, the control device sends a cutting signal to the second cutting mechanism, so that the second cutting mechanism timely cuts off the next second pole piece based on the cutting signal.

[0202] In this way, the corresponding pole piece is timely cut off by different cutting mechanisms, which not only reduces the interference between them, but also improves the cutting efficiency and pertinence.

[0203] In the embodiments of the present disclosure, on the one hand, the cutting mechanism is integrated in the winding device, which enriches the functions of the winding device and improves the versatility and adaptability of the winding device; on the other hand, the next pole piece is timely cut off when the current cell segment is abnormal, which improves the pertinence of pole piece cutting processing, and compared with subsequent invalidation of the entire cell, only part of the cell is invalidated, which achieves the purpose of saving materials, thereby reducing the manufacturing cost of the battery and improving the production rate of the device.

[0204] In some embodiments, after the cutting mechanism cuts off the next pole piece, the winding method further comprises a step S76, wherein:

[0205] The step S76 comprises controlling a material receiving mechanism of the winding device to connect the next pole piece to the winding mechanism to form a next cell.

[0206] Here, the material receiving mechanism can be any suitable mechanism capable of realizing the material receiving function, such as a material receiving plate, etc. The number of the material receiving mechanism can be at least one. In implementation, the number of the material receiving mechanism can be adapted to the number of the cutting mechanism.

[0207] In some embodiments, the receiving mechanism can be directly connected with the control device, or can be connected through communication between the winding device and the control device. In implementation, the control device sends a receiving signal to the receiving mechanism according to the cutting completion signal transmitted by the winding device, so that the receiving mechanism receives the next pole piece into the winding mechanism based on the receiving signal, so as to facilitate the winding mechanism to wind the pole piece to form the next battery cell.

[0208] The cutting completion signal can be any suitable signal representing the completion of cutting the pole piece. In some embodiments, the cutting completion signal is automatically generated when the cutting mechanism cuts the next pole piece, so that the receiving mechanism timely receives the pole piece.

[0209] In some embodiments, the receiving mechanism includes a first receiving mechanism and a second receiving mechanism, and the step S76 includes a step S761 and / or a step S762, wherein:

[0210] The step S761 controls the first receiving mechanism to connect the next first pole piece into the winding mechanism.

[0211] Here, after cutting the next first pole piece, the control device sends a receiving signal to the first receiving mechanism, so that the first receiving mechanism timely connects the next first pole piece into the winding mechanism based on the receiving signal.

[0212] The step S762 controls the second receiving mechanism to connect the next second pole piece into the winding mechanism.

[0213] Here, after cutting the next second pole piece, the control device sends a receiving signal to the second receiving mechanism, so that the second receiving mechanism timely connects the next second pole piece into the winding mechanism based on the receiving signal.

[0214] In this way, the corresponding pole piece is timely received by different receiving mechanisms, which not only reduces the interference between them, but also improves the receiving efficiency and pertinence.

[0215] In the embodiments of the present disclosure, on the one hand, the receiving mechanism is integrated in the winding device, which enriches the functions of the winding device and improves the versatility and adaptability of the winding device; on the other hand, after cutting the next pole piece, the receiving mechanism is used to timely receive the pole piece, which ensures the normal production of products to meet the production requirements of high timeliness and high efficiency.

[0216] Figure 8 An implementation flow of a winding method provided by an embodiment of the present disclosure Figure Two As shown in Figure 8 The winding method includes steps S801 to S808, wherein:

[0217] Step S801, control the anode electrode piece unwinding mechanism to release the anode electrode piece, the upper diaphragm unwinding mechanism to release the upper diaphragm, the cathode electrode piece unwinding mechanism to release the cathode electrode piece and the lower diaphragm unwinding mechanism to release the lower diaphragm;

[0218] Step S802, control the winding mechanism to wind the current anode electrode piece, the current upper diaphragm, the current cathode electrode piece and the current lower diaphragm in a preset winding direction, to form a current battery cell segment;

[0219] Step S803, control the first driving member to drive the auxiliary roller to be attached to the surface of the current battery cell segment, and control the second driving member to drive the auxiliary roller to roll on the surface of the current battery cell segment at a target rolling speed and a target rolling direction;

[0220] Step S804, control the displacement sensor (corresponding to the aforementioned displacement detection mechanism) to detect the current distance between the auxiliary roller and the current battery cell segment;

[0221] Step S805, control the pressure sensor (corresponding to the aforementioned pressure detection mechanism) to detect the current pressure between the auxiliary roller and the current battery cell segment;

[0222] Step S806, according to the current distance and the current pressure, control the driving member to drive the auxiliary roller to move until the winding is completed;

[0223] Step S807, in the case that the detection result of the current battery cell segment is the second detection result or the battery cell winding is completed, control the cutting mechanism to cut off the next anode electrode piece and / or the next cathode electrode piece;

[0224] Here, the winding, the detection and the pressure of the current battery cell segment are carried out simultaneously.

[0225] Step S808, control the material receiving mechanism to receive the next anode electrode piece and the next cathode electrode piece into the winding mechanism.

[0226] In the embodiments of the present disclosure, firstly, in the process of winding the current battery cell segment, the winding, the pressure and the detection are carried out simultaneously, which not only reduces the time of each independent process and improves the production efficiency, but also improves the detection effect and reduces the possibility that the defects cannot be detected due to the pressure relief between the electrode piece and the diaphragm, the electrode piece and the foreign matter, and the diaphragm and the foreign matter; secondly, when the current battery cell segment has an abnormality, the next electrode piece is cut off in time, which improves the pertinence of the electrode piece cutting process and achieves the purpose of saving materials; finally, after cutting off the next electrode piece, the material receiving mechanism is used to receive the electrode piece in time, which ensures the normal production of products and meets the production demand of high timeliness and high efficiency.

[0227] It should be understood that every feature, structure, or characteristic described above that is mentioned in connection with an "embodiment" or "one embodiment" is intended to mean that the particular feature, structure, or characteristic is included in at least one embodiment of the disclosure. Therefore, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that the sequence of the processes described above in various embodiments of the disclosure does not mean the order of execution, and the execution order of the processes should be determined according to their functions and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the disclosure. The sequence numbers of the above embodiments of the disclosure are only for description, and do not represent the advantages or disadvantages of the embodiments. It should be noted that in this paper, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or include elements inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0228] In several embodiments provided by the disclosure, it should be understood that the disclosed devices and methods can be implemented in other ways. The above-described device embodiments are only illustrative, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each component part shown or discussed can be through some interface, indirect coupling or communication connection between devices or units, which can be electrical, mechanical or other forms. The units described above as separate components can be or can not be physically separated, and the components shown as units can be or can not be physical units; they can be located in one place, or distributed on multiple network units; some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment. In addition, each functional unit in the embodiments of the disclosure can be integrated into a processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be realized in the form of hardware or hardware plus software functional unit.

[0229] The above merely describes the embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure.

Claims

1. A winding device, characterized in that, It includes a first electrode unwinding mechanism, a second electrode unwinding mechanism, a first diaphragm unwinding mechanism, a second diaphragm unwinding mechanism, a winding mechanism, an auxiliary roller mechanism, and a detection mechanism, wherein: The first electrode unwinding mechanism is used to release the first electrode. The second electrode unwinding mechanism is used to release the second electrode. The first diaphragm unwinding mechanism is used to release the first diaphragm; The second diaphragm unwinding mechanism is used to release the second diaphragm; The winding mechanism is used to wind the current first electrode released by the first electrode unwinding mechanism, the current first diaphragm released by the first diaphragm unwinding mechanism, the current second electrode released by the second electrode unwinding mechanism, and the current second diaphragm released by the second diaphragm unwinding mechanism to form the current cell segment. The auxiliary roller mechanism is used to apply pressure to the current battery cell segment when it is pressed against the surface of the current battery cell segment; The detection mechanism is used to determine the detection result of the current cell segment based on the current of the current circuit; wherein the current circuit includes the detection mechanism, the first conductive element of the first electrode unwinding mechanism, the second conductive element of the second electrode unwinding mechanism, and the current cell segment.

2. The winding equipment according to claim 1, characterized in that, The winding equipment also includes a cutting mechanism, wherein: The cutting mechanism, located upstream of the winding mechanism, is used to cut the next electrode released by the target electrode unwinding mechanism when the detection result of the current cell segment is the second detection result; wherein the second detection result indicates that the current cell segment has a defect, and the target electrode unwinding mechanism includes at least one of the following: the first electrode unwinding mechanism and the second electrode unwinding mechanism.

3. The winding equipment according to claim 2, characterized in that, The winding equipment also includes a receiving mechanism, wherein: The receiving mechanism, located upstream of the cutting mechanism, is used to connect the cut next electrode sheet to the winding mechanism to form the next battery cell.

4. The winding equipment according to claim 1, characterized in that, The auxiliary roller mechanism includes a symmetrically distributed first auxiliary roller mechanism and a second auxiliary roller mechanism, wherein: The first auxiliary roller mechanism, located on one side of the winding mechanism, is used to apply pressure to the current cell segment when it is pressed against the surface of the current cell segment; The second auxiliary roller mechanism, located on the other side of the winding mechanism, is used to apply pressure to the current cell segment after it has been pressurized by the first auxiliary roller mechanism when it is pressed against the surface of the current cell segment.

5. The winding apparatus according to any one of claims 1 to 4, characterized in that, The auxiliary roller mechanism includes an auxiliary roller and a driving component, wherein the driving component includes a first driving component and a second driving component, wherein: The first driving member is used to drive the auxiliary roller closer to or further away from the current cell segment, so as to reduce or increase the distance between the auxiliary roller and the current cell segment; The second driving member is used to drive the auxiliary roller to roll on the surface of the current cell segment at a target rolling speed and a target rolling direction to apply pressure to the current cell segment; wherein the target rolling speed is the same as the winding speed of the winding mechanism, and the target rolling direction is opposite to the winding direction of the winding mechanism.

6. The winding device according to claim 5, characterized in that, The auxiliary roller mechanism further includes a pressure detection mechanism and a displacement detection mechanism, wherein: The displacement detection mechanism is used to detect the current distance between the auxiliary roller and the current cell segment; The first driving member is further configured to drive the auxiliary roller to move based on the current distance detected by the displacement detection mechanism; The pressure detection mechanism is used to detect the current pressure between the auxiliary roller and the current cell segment; The first drive member is further configured to drive the auxiliary roller to move when the current pressure is not within the pressure threshold range, so that the pressure between the auxiliary roller and the current cell segment is within the pressure threshold range.

7. The winding device according to claim 5, characterized in that, The width of the auxiliary roller is not less than the width of the current cell segment.

8. The winding device according to claim 5, characterized in that, The surface of the auxiliary roller is covered with a flexible material.

9. A winding method, characterized in that, The winding method includes: The auxiliary roller mechanism of the control winding equipment applies pressure to the current cell segment when it presses against the surface of the current cell segment; wherein, the winding equipment further includes a first electrode unwinding mechanism, a second electrode unwinding mechanism, a first diaphragm unwinding mechanism, a second diaphragm unwinding mechanism, a winding mechanism, and a detection mechanism, and the current cell segment is formed by the winding mechanism winding the current first electrode released by the first electrode unwinding mechanism, the current first diaphragm released by the first diaphragm unwinding mechanism, the current second electrode released by the second electrode unwinding mechanism, and the current second diaphragm released by the second diaphragm unwinding mechanism; Based on the current of the current circuit, the detection result of the current cell segment is determined; wherein, the current circuit includes the detection mechanism, the first conductive element of the first electrode unwinding mechanism, the second conductive element of the second electrode unwinding mechanism, and the current cell segment.

10. The winding method according to claim 9, characterized in that, The determination of the detection result of the current cell segment based on the current of the current circuit includes: The resistance of the current cell segment is determined based on the current current of the current circuit and the current detection voltage; wherein the current detection voltage is determined based on the current separator. If the resistance of the current cell segment is within the resistance threshold range, the first detection result is taken as the detection result of the current cell segment; wherein, the first detection result indicates that the current cell segment has no defects; If the resistance of the current cell segment is not within the resistance threshold range, the second detection result is taken as the detection result of the current cell segment; wherein, the second detection result indicates that the current cell segment has a defect.

11. The winding method according to claim 9, characterized in that, The winding method further includes: If the detection result of the current cell segment is the second detection result, the cutting mechanism of the winding equipment is controlled to cut the next electrode released by the target electrode unwinding mechanism; wherein, the cutting mechanism is located upstream of the winding mechanism, and the target electrode unwinding mechanism includes at least one of the following: the first electrode unwinding mechanism and the second electrode unwinding mechanism.

12. The winding method according to claim 11, characterized in that, The winding method further includes: The receiving mechanism of the winding equipment connects the next electrode to the winding mechanism to form the next cell; wherein the receiving mechanism is located upstream of the cutting mechanism.

13. The winding method according to any one of claims 9 to 12, characterized in that, The auxiliary roller mechanism includes an auxiliary roller, a driving component, and a displacement detection mechanism; the winding method further includes: The displacement detection mechanism is controlled to detect the current distance between the auxiliary roller and the current cell segment; Based on the current distance, the drive unit is controlled to drive the auxiliary roller to move, thereby reducing or increasing the distance between the auxiliary roller and the current cell segment.

14. The winding method according to claim 13, characterized in that, The winding method further includes: The pressure detection mechanism of the auxiliary roller mechanism detects the current pressure between the auxiliary roller and the current cell segment; If the current pressure is not within the pressure threshold range, the drive unit is controlled to drive the auxiliary roller to move based on the current pressure, so that the pressure between the auxiliary roller and the current cell segment is within the pressure threshold range.

15. The winding method according to claim 14, characterized in that, The pressure threshold range includes a first pressure threshold and a second pressure threshold, wherein the first pressure threshold is smaller than the second pressure threshold. The step of controlling the drive component to drive the auxiliary roller to move based on the current pressure includes: If the current pressure is less than the first pressure threshold, control the drive to drive the auxiliary roller closer to the current cell segment until the next pressure detected by the pressure detection mechanism is within the pressure threshold range; If the current pressure is greater than the second pressure threshold, the drive unit is controlled to drive the auxiliary roller away from the current cell segment until the next pressure detected by the pressure detection mechanism is within the pressure threshold range.

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