Winding machine and winding method

Abstract

The present application discloses a winding machine and a winding method. The winding machine comprises: a winding pin for winding an electrode sheet to obtain a first cell assembly; a shaping device arranged downstream of the winding pin and used for shaping the first cell assembly to obtain the shaped first cell assembly; a measurement light curtain arranged on the shaping device, electrically connected to a controller, and used for sending a first electrical signal to the controller when the shaped first cell assembly is located at the shaping device, wherein the first electrical signal is used for representing a first tab width of the shaped first cell assembly; and the controller used for determining the first tab width on the basis of the first electrical signal, determining a first tab misalignment amount of the shaped first cell assembly on the basis of the first tab width, adjusting the diameter of the winding pin on the basis of the first tab misalignment amount, and controlling the winding pin having undergone diameter adjustment to wind the electrode sheet, so as to obtain a second cell assembly.

Description

Winding machine and winding method

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application 202411312128.1, filed on September 20, 2024, entitled “Winding machine and winding method”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a winding machine and a winding method. BACKGROUND

[0004] With the development of battery technology, users have increasingly high requirements for battery quality.

[0005] During production, the battery cell needs to go through winding, pre-pressing, cold-pressing and other processes. In the production process of the battery cell, the tab may be misaligned, which affects the safety of the battery.

[0006] Therefore, in order to reduce the tab misalignment and improve safety, a solution is needed to adjust the tab misalignment. SUMMARY

[0007] The present application provides a winding machine and a winding method, which can effectively reduce the tab misalignment.

[0008] In a first aspect, the present application provides a winding machine, comprising: a winding needle, configured to wind a tab to obtain a first battery cell assembly; a shaping device, arranged downstream of the winding needle, configured to shape the first battery cell assembly to obtain a shaped first battery cell assembly; a measurement light curtain, arranged at the shaping device and electrically connected to a controller, configured to send a first electric signal to the controller when the shaped first battery cell assembly is located at the shaping device, the first electric signal being used to represent a first tab width of the shaped first battery cell assembly; and the controller, configured to determine the first tab width based on the first electric signal, determine a first tab misalignment of the shaped first battery cell assembly based on the first tab width, adjust a diameter of the winding needle based on the first tab misalignment, and control the winding needle with the adjusted diameter to wind the tab to obtain a second battery cell assembly.

[0009] Thus, the measurement light curtain can accurately measure the tab width of the shaped battery cell assembly, thereby accurately determining the tab misalignment. Based on this, the diameter of the winding needle can be adjusted based on the tab misalignment of the shaped first battery cell assembly, so as to reduce the tab misalignment of the current battery cell assembly during winding of the current battery cell assembly (i.e. the second battery cell assembly), thereby achieving closed-loop adjustment and effectively reducing the tab misalignment.

[0010] In some embodiments, the measuring light curtain comprises: a transmitting end, disposed opposite to the receiving end and spaced apart by a preset distance, for transmitting measuring light to the receiving end, the position between the transmitting end and the receiving end being used for placing the tab of the first battery assembly after shaping; and the receiving end, electrically connected to the controller, for receiving the measuring light passing through the tab and generating a first electric signal based on the measuring light passing through the tab, and sending the first electric signal to the controller.

[0011] In this way, the transmitting end transmits the measuring light, and the receiving end receives the measuring light passing through the tab, so that the change in light can accurately reflect the width of the tab, and therefore the electric signal generated based on the measuring light passing through the tab can accurately represent the width of the tab.

[0012] In some embodiments, the winding machine further comprises: a feeding assembly, disposed between the winding needle and the shaping device, for moving the first battery assembly from the winding needle to the shaping device.

[0013] In this way, the first battery assembly can be automatically moved from the winding needle to the shaping device by the feeding assembly, realizing the automation of the production process of the battery assembly, saving labor costs, and improving production efficiency.

[0014] In some embodiments, the feeding assembly comprises: a first lifting shaft, a feeding manipulator, a manipulator telescopic cylinder, and a bidirectional module; the first lifting shaft, the manipulator telescopic cylinder, and the bidirectional module are respectively electrically connected to the controller; and the first lifting shaft, the manipulator telescopic cylinder, and the bidirectional module are respectively mechanically connected to the feeding manipulator.

[0015] In this way, the first battery assembly can be moved from the winding needle to the shaping device by the first lifting shaft, the feeding manipulator, the manipulator telescopic cylinder, and the bidirectional module, without the need for manual operation, saving labor costs and improving production efficiency.

[0016] In some embodiments, the controller is further configured to control the first lifting shaft to drive the feeding manipulator to move to the winding needle, control the manipulator telescopic cylinder to drive the feeding manipulator to pick up the first battery assembly from the winding needle, control the bidirectional module to drive the feeding manipulator to stretch the first battery assembly, and control the first lifting shaft to drive the feeding manipulator to move the stretched first battery assembly to the shaping device.

[0017] In this way, the first battery assembly can be automatically moved from the winding needle to the shaping device by the controller controlling the first lifting shaft, the manipulator telescopic cylinder, and the bidirectional module to drive the feeding manipulator, without the need for manual operation, saving labor costs and improving production efficiency.

[0018] In some embodiments, the shaping device comprises a pre-pressing assembly and / or a cold-pressing assembly; the pre-pressing assembly is arranged downstream of the winding needle and is used to pre-press the first battery cell assembly to obtain a pre-pressed first battery cell assembly; and the cold-pressing assembly is arranged downstream of the pre-pressing assembly and is used to cold-press the first battery cell assembly to obtain a cold-pressed first battery cell assembly.

[0019] In this way, the measurement light curtain can be arranged at the pre-pressing device to measure the tab width of the pre-pressed battery cell assembly, or can be arranged at the cold-pressing device to measure the tab width of the cold-pressed battery cell assembly, and the arrangement of the measurement light curtain is more flexible.

[0020] In some embodiments, the pre-pressing assembly comprises a sensor, a transplanting module, a pressing mechanism, a conveying mechanism, and a second lifting shaft; the sensor is arranged at a target position and is electrically connected to the controller, and the target position is used to place the first battery cell assembly; the transplanting module is mechanically connected to the pressing mechanism and is electrically connected to the controller; the conveying mechanism is electrically connected to the controller; and the second lifting shaft is mechanically connected to the pressing mechanism and is electrically connected to the controller.

[0021] In this way, the first battery cell assembly can be automatically pre-pressed by the sensor, the transplanting module, the pressing mechanism, the conveying mechanism, and the second lifting shaft, without the need for manual operation, thereby saving labor costs and improving production efficiency.

[0022] In some embodiments, the controller is further configured to control the conveying mechanism to convey the first battery cell assembly to the target position, control the sensor to detect whether the first battery cell assembly is placed at the target position, in the case that the first battery cell assembly is placed at the target position, control the transplanting module to drive the pressing mechanism to move above the target position, and control the second lifting shaft to drive the pressing mechanism to pre-press the first battery cell assembly to obtain a pre-pressed first battery cell assembly.

[0023] In this way, the first battery cell assembly can be automatically pre-pressed by the controller controlling the conveying mechanism, the sensor, the transplanting module, the pressing mechanism, and the second lifting shaft, without the need for manual operation, thereby saving labor costs and improving production efficiency.

[0024] In some embodiments, the pre-pressing assembly further comprises a bottom plate arranged below the conveying mechanism and above the pressing mechanism; the transmitting end is arranged at the pressing mechanism, and the receiving end is arranged at the bottom plate.

[0025] In this way, the measurement light curtain is arranged at the pre-pressing assembly to measure the tab width during the pre-pressing process, thereby saving time and improving production efficiency, and the positions of the transmitting end and the receiving end can be flexibly arranged.

[0026] In some embodiments, the pre-pressing assembly further comprises a bottom plate arranged below the conveying mechanism and a pressing mechanism arranged above the conveying mechanism; the emitting end is arranged on the bottom plate and the receiving end is arranged on the pressing mechanism.

[0027] In this way, the measuring light curtain is arranged on the pre-pressing assembly, so that the tab width can be measured during the pre-pressing process, time is saved, and production efficiency is improved. Moreover, the positions of the emitting end and the receiving end can be flexibly arranged.

[0028] In a second aspect, the application provides a winding method applied to the winding machine shown in any one of the embodiments of the first aspect. The method comprises: winding the pole piece by the winding needle to obtain a first battery assembly; shaping the first battery assembly by the shaping device to obtain a shaped first battery assembly, the shaping device being arranged downstream of the winding needle; sending a first electric signal to the controller by the measuring light curtain when the shaped first battery assembly is located at the shaping device, the first electric signal being used to represent a first tab width of the shaped first battery assembly, the measuring light curtain being arranged on the shaping device; determining the first tab width based on the first electric signal by the controller; determining a first tab misalignment amount of the shaped first battery assembly based on the first tab width by the controller; adjusting the diameter of the winding needle based on the first tab misalignment amount by the controller; and winding the pole piece by the winding needle with the adjusted diameter to obtain a second battery assembly controlled by the controller.

[0029] In this way, the tab width of the shaped battery assembly can be accurately measured by the measuring light curtain, so that the tab misalignment amount can be accurately determined. Based on this, the diameter of the winding needle can be adjusted based on the tab misalignment amount of the shaped first battery assembly, so that the tab misalignment amount of the current battery assembly can be reduced during the winding of the current battery assembly (i.e., the second battery assembly), thereby realizing closed-loop adjustment and effectively reducing the tab misalignment.

[0030] In some embodiments, before the diameter of the winding needle is adjusted based on the first tab misalignment amount by the controller, the method further comprises: obtaining a first pole piece parameter by the controller, the first pole piece parameter being a parameter of the pole piece used to generate the second battery assembly; determining a second tab misalignment amount corresponding to the first pole piece parameter based on a first preset correspondence relationship by the controller, the first preset correspondence relationship comprising a correspondence relationship between the pole piece parameter and the tab misalignment amount; and adjusting the diameter of the winding needle based on the first tab misalignment amount by the controller, comprising: adjusting the diameter of the winding needle based on the first tab misalignment amount when the second tab misalignment amount is within a first preset range.

[0031] In this way, the tab misalignment amount of the battery assembly that can be produced can be predicted based on the pole piece parameter, and the winding is performed only when the tab misalignment amount is within an acceptable range, thereby avoiding the production of a battery assembly with an excessive tab misalignment amount and causing resource waste.

[0032] In some embodiments, the winding machine further comprises an embossing roller configured to roll the tab sheet for generating the second battery cell assembly, and a tension roller configured to stretch the tab sheet for generating the second battery cell assembly; and the method further comprises: in a case where the second tab misalignment exceeds the first preset range, adjusting, by the controller, the pressure of the embossing roller and / or the tension of the tension roller.

[0033] In this way, by the above process, in a case where the tab misalignment of the battery cell assembly that can be produced using the current tab sheet exceeds the acceptable misalignment range, the thickness of the tab sheet can be changed by adjusting the pressure of the embossing roller and / or the tension of the tension roller, so as to reduce the tab misalignment of the battery cell assembly, thereby avoiding the production of battery cell assemblies with excessive tab misalignment and causing resource waste.

[0034] In some embodiments, after the first tab misalignment of the first battery cell assembly is determined by the controller based on the first tab width, the method further comprises: winding the tab sheet by the winding needle to obtain a second battery cell assembly; shaping the second battery cell assembly by the shaping device to obtain a shaped second battery cell assembly; in a case where the shaped second battery cell assembly is located at the shaping device, sending, by the measurement curtain, a second electrical signal to the controller, the second electrical signal being used to represent a second tab width of the shaped second battery cell assembly; determining, by the controller, the second tab width based on the second electrical signal; determining, by the controller, a third tab misalignment of the shaped second battery cell assembly based on the second tab width; and in a case where the third tab misalignment is within a second preset range, updating, by the controller, the first preset correspondence relationship based on the third tab misalignment.

[0035] In this way, by the above process, in a case where the actual tab misalignment of the second battery cell assembly is less than the minimum tab misalignment predicted based on the first preset correspondence relationship, the first preset correspondence relationship can be recalibrated, so as to improve the accuracy of tab misalignment prediction and avoid the production of battery cell assemblies with excessive tab misalignment.

[0036] In some embodiments, in a case where the third tab misalignment is within the second preset range, updating, by the controller, the first preset correspondence relationship based on the third tab misalignment comprises: in a case where the third tab misalignment is within the second preset range, adding, by the controller, the third tab misalignment and the corresponding first tab parameters to a fitting sample set; in a case where the number of fitting samples included in the fitting sample set reaches a preset threshold, fitting, by the controller, the fitting samples in the fitting sample set to obtain a second preset correspondence relationship; and updating, by the controller, the first preset correspondence relationship to the second preset correspondence relationship.

[0037] Therefore, by the above process, the fitting sample can be collected in the process of producing the battery cell assembly, and the correspondence between the tab parameter and the tab misplacement amount is refitted when the number of fitting samples reaches the preset threshold, so as to automatically adjust the logic of predicting the tab misplacement amount, and improve the prediction accuracy of the tab misplacement amount.

[0038] In some embodiments, the adjusting, by the controller, the diameter of the winding needle based on the first tab misplacement amount includes: determining, by the controller, a first diameter change amount corresponding to the first tab misplacement amount based on a third preset correspondence, the third preset correspondence including a correspondence between a tab misplacement amount and a diameter change amount of the winding needle; and adjusting, by the controller, the diameter of the winding needle based on the first diameter change amount.

[0039] Therefore, the third preset correspondence can be used to determine the diameter change amount of the winding needle corresponding to the first tab misplacement amount, so as to accurately adjust the diameter of the winding needle, and effectively reduce the tab misplacement amount of the battery cell assembly.

[0040] In some embodiments, after the adjusting, by the controller, the first tab misplacement amount of the first battery cell assembly after shaping based on the first tab width, the method further includes: in a case where the third tab misplacement amount exceeds a third preset range, obtaining, by the controller, a plurality of tab misplacement amounts and diameter change amounts corresponding thereto; fitting, by the controller, the plurality of tab misplacement amounts and the diameter change amounts corresponding thereto to obtain a fourth preset correspondence; and updating, by the controller, the third preset correspondence to the fourth preset correspondence.

[0041] Therefore, by the above process, in a case where the first diameter change amount determined based on the third preset correspondence is inaccurate, the correspondence between the tab misplacement amount and the diameter change amount of the winding needle is refitted, so as to automatically adjust the logic of determining the diameter change amount, and improve the accuracy of adjusting the diameter of the winding needle.

[0042] In a third aspect, the present application provides a winding method applied to the controller in the winding machine as shown in any one of the embodiments of the first aspect, and the method includes: determining a first tab width of a first battery cell assembly after shaping based on a first electrical signal, the first electrical signal being an electrical signal sent by a measurement curtain to the controller in a case where the first battery cell assembly after shaping is located at a shaping device, the first electrical signal being used to represent the first tab width of the first battery cell assembly after shaping, the first battery cell assembly being obtained by winding the tab by a winding needle, the first battery cell assembly after shaping being obtained by shaping the first battery cell assembly by a shaping device, the measurement curtain being arranged on the shaping device, and the shaping device being arranged downstream of the winding needle; determining a first tab misplacement amount of the first battery cell assembly after shaping based on the first tab width; adjusting a diameter of the winding needle based on the first tab misplacement amount; and controlling the winding needle after the diameter adjustment to wind the tab to obtain a second battery cell assembly.

[0043] Therefore, the tab width of the shaped cell assembly can be accurately measured by the light curtain, so as to accurately determine the tab misalignment amount. Based on this, the diameter of the winding needle can be adjusted based on the tab misalignment amount of the previous cell assembly (i.e., the first cell assembly) after shaping, so as to reduce the tab misalignment amount of the current cell assembly (i.e., the second cell assembly) during winding of the current cell assembly, thereby realizing closed-loop adjustment and effectively reducing the tab misalignment.

[0044] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0045] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limitations on the present application. Moreover, in the entire drawings, the same reference numerals are used to designate the same components. In the drawings:

[0046] FIG. 1 is a structural schematic diagram of a winding machine according to some embodiments of the present application;

[0047] FIG. 2 is a structural schematic diagram of a winding machine according to some embodiments of the present application;

[0048] FIG. 3 is a structural schematic diagram of a winding machine according to some embodiments of the present application;

[0049] FIG. 4 is a structural schematic diagram of a winding machine according to some embodiments of the present application;

[0050] FIG. 5a is a structural schematic diagram of a winding machine according to some embodiments of the present application;

[0051] FIG. 5b is a structural schematic diagram of a winding machine according to some embodiments of the present application;

[0052] FIG. 6 is a control flowchart of a controller according to some embodiments of the present application;

[0053] FIG. 7 is a flowchart of a winding method according to some embodiments of the present application;

[0054] FIG. 8 is a flowchart of a winding method according to some embodiments of the present application;

[0055] FIG. 9 is a flowchart of a winding method according to some embodiments of the present application.

[0056] In the drawings, the figures are not necessarily to scale as the illustrations are for illustrative purposes only. DETAILED DESCRIPTION

[0057] The embodiments of the present application will be described in detail with reference to the drawings, wherein the following embodiments are only used to clarify the present application, and therefore, should not be used to limit the scope of the present application.

[0058] If not specifically described, all the embodiments and optional embodiments of the present application can be combined to form new technical solutions.

[0059] If not specifically described, all the technical features and optional technical features of the present application can be combined to form new technical solutions.

[0060] If not specifically described, all the steps of the present application can be performed in sequence or randomly, and preferably, in sequence. For example, the method comprises steps (a) and (b), which means that the method can comprise steps (a) and (b) performed in sequence, or steps (b) and (a) performed in sequence. For example, it is mentioned that the method can further comprise step (c), which means that step (c) can be added to the method in any order, for example, the method can comprise steps (a), (b) and (c), or steps (a), (c) and (b), or steps (c), (a) and (b), etc.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the use herein of terms such as “comprise” and “have” and any variations such as “comprises”, “comprising”, “has”, “having”, “including” and “includes” is intended to be inclusive of the terms “consist of” and “consisting of”.

[0062] In the description of the embodiments of the present application, the technical terms “first”, “second”, etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of “a plurality of” is two or more, unless otherwise explicitly and specifically limited.

[0063] Reference herein to “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0064] In the description of the embodiments of the present application, the term "and / or" is only to describe an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0065] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0066] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0067] At present, with the development of battery technology, users have higher and higher requirements for battery quality.

[0068] The inventors of the present application noticed that the battery cell needs to go through winding, pre-pressing, cold-pressing and other processes in production. In the production process of the battery cell, due to the thickness fluctuation of the anode and cathode tab materials and the separator material of the battery cell, the battery cell obtained by winding is prone to tab misplacement, which affects the safety of the battery. Therefore, in order to reduce tab misplacement and improve safety, a scheme capable of adjusting the tab misplacement amount is needed.

[0069] To solve the above technical problems, the inventors of the present application found that after the battery cell is completed, the production operator can take out the battery cell, measure the tab width of the battery cell using a tape measure or a film ruler, calculate the tab misplacement amount, input the tab misplacement amount through a human-machine interface (HMI) and save it, and then the HMI transmits the tab misplacement amount to the variable winding diameter control system of the controller to adjust the winding needle diameter. However, the accuracy of manually measuring the tab width is low, so the calculated tab misplacement amount is not accurate, which causes the adjustment of the winding needle diameter to be inaccurate, and the tab misplacement cannot be effectively reduced.

[0070] Therefore, the inventor of the present application has made further research and proposed a winding machine and a winding method, which can accurately measure the tab width of the shaped battery cell assembly by measuring the light curtain, so as to accurately determine the tab misalignment amount, and based on this, the diameter of the winding needle can be adjusted based on the tab misalignment amount of the shaped previous battery cell assembly (i.e. the first battery cell assembly), so as to reduce the tab misalignment amount of the current battery cell assembly (i.e. the second battery cell assembly) during the winding process of the current battery cell assembly, thereby realizing closed-loop adjustment and effectively reducing the tab misalignment.

[0071] The winding machine and the winding method provided by the embodiments of the present application will be described in detail below.

[0072] FIG. 1 is a structural schematic diagram of a winding machine provided by some embodiments of the present application.

[0073] As shown in FIG. 1, the winding machine 100 can include a winding needle 110, a shaping device 120, a measurement light curtain 130, and a controller 140.

[0074] The winding needle 110 can be electrically connected with the controller 140 and can be used to wind the pole piece to obtain the first battery cell assembly.

[0075] Specifically, the winding needle 110 can be used to wind the pole piece to obtain the first battery cell assembly when the pole piece reaches the winding station, and can also be used to wind the pole piece to obtain the second battery cell assembly when the pole piece reaches the winding station.

[0076] The diameter of the winding needle 110 can be changed. The first battery cell assembly obtained by winding can be in a winding drum shape.

[0077] For example, as shown in FIG. 2, the winding station can include a winding position 210, a rubberizing position 220, and a discharging position 230, and the winding needle can move between the winding position 210, the rubberizing position 220, and the discharging position 230. When the winding needle is located at the winding position 210, the winding needle can wind the cathode pole piece, the anode pole piece, and the separator to obtain the first battery cell assembly; then the winding needle can move to the rubberizing position 220, and when the winding needle is located at the rubberizing position 220, the first battery cell assembly can be rubberized; then the winding needle can move to the discharging position 230 to wait for discharging.

[0078] The shaping device 120 can be electrically connected with the controller 140 and can be arranged downstream of the winding needle 110, and can be used to shape the first battery cell assembly to obtain the shaped first battery cell assembly.

[0079] The shaped first battery cell assembly can be in a flat winding drum shape.

[0080] The measurement light curtain 130 can be arranged on the shaping device, can be electrically connected with the controller 140, and can be used to send a first electric signal to the controller 140 when the shaped first battery cell assembly is located at the shaping device. The first electric signal can be used to represent the first tab width of the shaped first battery cell assembly.

[0081] The measurement light curtain 130 can be used to measure the tab width of the first battery cell assembly during or after the shaping of the first battery cell assembly.

[0082] The measurement light curtain 130 can be an optical measurement and control system made by different principles of the action of light flux on photoelectric elements.

[0083] For example, the measurement accuracy of the measurement light curtain can be 0.01 mm, the measurement range can reach 150 mm, and two width information can be measured and sent to the controller at the same time. That is, if the first battery cell assembly includes two tabs, the first electric signal can include two electric signals, each electric signal can represent the tab width corresponding to one tab of the first battery cell assembly. Based on this, the first tab width can include the tab widths corresponding to the two tabs of the first battery cell assembly, respectively.

[0084] The controller 140 can be used to determine the first tab width based on the first electric signal, determine the first tab misalignment amount of the shaped first battery cell assembly based on the first tab width, adjust the diameter of the winding needle based on the first tab misalignment amount, and control the winding needle to wind the tab after the diameter adjustment to obtain a second battery cell assembly.

[0085] The controller 140 can be a programmable logic controller (PLC), or a combination of an industrial computer and a PLC.

[0086] The second battery cell assembly can be wound after the first battery cell assembly is wound.

[0087] Since the tab misalignment amount of the wound battery cell assembly can be changed by adjusting the diameter of the winding needle during winding, after the first tab misalignment amount of the first battery cell assembly is determined, the diameter of the winding needle can be adjusted based on the first tab misalignment amount to change the tab misalignment amount of the next battery cell assembly, i.e., the second battery cell assembly, wound by the winding needle.

[0088] Therefore, the tab width of the shaped battery cell assembly can be accurately measured by the measurement light curtain, so that the tab misalignment amount can be accurately determined. Based on this, the diameter of the winding needle can be adjusted based on the tab misalignment amount of the shaped previous battery cell assembly (i.e., the first battery cell assembly) so as to reduce the tab misalignment amount of the current battery cell assembly (i.e., the second battery cell assembly) during winding of the current battery cell assembly, thereby realizing closed-loop adjustment and effectively reducing tab misalignment.

[0089] In some embodiments of the present application, as shown in FIG. 3, the measurement light curtain can include a transmitting end 111 and a receiving end 112.

[0090] The transmitting end 111 can be arranged opposite to the receiving end 112 and spaced apart by a preset distance. The transmitting end 111 can be configured to emit measurement light to the receiving end 112. The position between the transmitting end 111 and the receiving end 112 can be used to place the tab of the shaped first battery cell assembly.

[0091] The receiving end 112 can be electrically connected to the controller. The receiving end 112 can be configured to receive the measurement light passing through the tab and generate a first electrical signal based on the measurement light passing through the tab, and send the first electrical signal to the controller.

[0092] Here, the preset distance can be set according to actual needs.

[0093] The shaping station can be arranged between the transmitting end 111 and the receiving end 112. The shaping station can be configured to place the first battery cell assembly.

[0094] When the shaped first battery cell assembly is located at the shaping station, the tab of the shaped first battery cell assembly is located between the transmitting end 111 and the receiving end 112. The measurement light emitted by the transmitting end 111 to the receiving end 112 can be partially blocked by the tab of the shaped first battery cell assembly.

[0095] The measurement light passing through the tab of the shaped first battery cell assembly can be the remaining part of the measurement light emitted by the transmitting end 111 and blocked by the tab of the shaped first battery cell assembly.

[0096] The receiving end 112 can convert the received remaining part of the measurement light into a first electrical signal.

[0097] Specifically, the transmitting end 111 can include a light source module, and the receiving end 112 can include a photoelectric element. When the measurement light emitted by the light source module passes through the tab of the shaped first battery cell assembly, part of the light will be blocked by the tab, causing the light flux projected onto the photoelectric element to change. The photoelectric element can convert the light signal into a first electrical signal and send the analog data of the first electrical signal to the controller 140.

[0098] Among them, the photoelectric element can refer to the photosensitive diode. When there is no light, the photosensitive diode is the same as the ordinary diode, and the reverse current is small, which is called the dark current of the photosensitive diode; When there is light, the carrier is excited, and the electron-hole is generated, which is called photoelectric carrier. Under the action of the external electric field, the photoelectric carrier participates in the conduction, forming a reverse current much larger than the dark current, which is called the photocurrent. The size of the photocurrent is proportional to the light intensity, so the electric signal on the load resistor changes with the light intensity.

[0099] In this way, the emission end emits the measurement light, and the receiving end receives the measurement light passing through the tab, so that the change of the light can accurately reflect the width of the tab, and therefore the first electric signal generated based on the measurement light passing through the tab can accurately represent the width of the tab.

[0100] In some embodiments of the present application, the winding machine can further include a discharging assembly.

[0101] The discharging assembly can be arranged between the winding needle and the shaping device, and can be used to move the first battery assembly from the winding needle to the shaping device.

[0102] Specifically, the discharging assembly can be used to move the first battery assembly from the winding station to the shaping station.

[0103] For example, as shown in FIG. 2, when the winding needle is located at the discharging position 230, the discharging assembly 150 can move the first battery assembly from the discharging position to the shaping device.

[0104] After the discharging assembly moves the first battery assembly from the discharging position of the winding station to the shaping device, the shaping device can shape the first battery assembly.

[0105] In this way, the first battery assembly can be automatically moved from the winding needle to the shaping device by the discharging assembly, realizing the automation of the battery assembly production process, which can save labor costs and improve production efficiency.

[0106] In some embodiments of the present application, as shown in FIG. 4, the discharging assembly can include a first lifting shaft 151, a discharging manipulator 152, a manipulator telescopic cylinder 153, and a bidirectional module 154.

[0107] Among them, the first lifting shaft 151, the manipulator telescopic cylinder 153 and the bidirectional module 154 are respectively electrically connected with the controller; the first lifting shaft 151, the manipulator telescopic cylinder 153 and the bidirectional module 154 are respectively mechanically connected with the discharging manipulator 152.

[0108] The controller can be used to control the first lifting shaft 151, the mechanical hand telescopic cylinder 153 and the bidirectional module 154. The first lifting shaft 151, the mechanical hand telescopic cylinder 153 and the bidirectional module 154 can be used to drive the unloading mechanical hand 152.

[0109] The unloading mechanical hand 152 can include multiple groups of clamping poles, and each group of clamping poles can include an outer clamping pole 1521 and an inner clamping pole 1522. For example, the unloading mechanical hand 152 can include two groups of clamping poles.

[0110] When the unloading mechanical hand 152 clamps the first battery cell assembly, the outer clamping pole 1521 can be located outside the first battery cell assembly, and the inner clamping pole 1522 can be inserted into the first battery cell assembly.

[0111] In this way, through the first lifting shaft, the unloading mechanical hand, the mechanical hand telescopic cylinder and the bidirectional module, the battery cell assembly can be moved from the winding needle to the shaping device without manual operation, saving labor costs and improving production efficiency.

[0112] In some embodiments of the present application, as shown in FIG. 4, the unloading assembly can further include a motor mounting seat 155, a bidirectional module assembly motor transmission protective cover 156, an unloading mechanical hand tension cylinder 157, a drag chain 158, a lifting shaft motor 159, a lifting shaft module mounting support 160, a sensor protective cover 161, a bidirectional module mounting seat 162, a buffer 163, a cylinder stroke top block 164, an unloading mechanical hand mounting bottom plate 165 and a bidirectional module assembly 166. The unloading mechanical hand tension cylinder 157 is used to drive the clamping poles of the unloading mechanical hand to clamp or loosen.

[0113] In some embodiments of the present application, the controller can be used to control the first lifting shaft 151 to drive the unloading mechanical hand 152 to move to the winding needle, control the mechanical hand telescopic cylinder 153 to drive the unloading mechanical hand 152 to clamp the first battery cell assembly from the winding needle, control the bidirectional module 154 to drive the unloading mechanical hand 152 to stretch the first battery cell assembly, and control the first lifting shaft 151 to drive the unloading mechanical hand 152 to move the stretched first battery cell assembly to the shaping device.

[0114] Specifically, the controller can first control the first lifting shaft 151 to drive the unloading mechanical hand 152 to move to the unloading position in the winding station, then control the mechanical hand telescopic cylinder 153 to drive the unloading mechanical hand 152 to clamp the first battery cell assembly from the unloading position in the winding station, move the first battery cell assembly away from the winding needle, then control the first lifting shaft 151 to drive the unloading mechanical hand 152 to move the first battery cell assembly to the battery cell stretching station, then control the bidirectional module 154 to drive the two groups of clamping poles of the unloading mechanical hand 152 to move reversely, stretch the first battery cell assembly from a circular shape to an elliptical shape, and control the first lifting shaft 151 to drive the unloading mechanical hand 152 to move the first battery cell assembly to the shaping device.

[0115] Thus, by controlling the first lifting shaft, the mechanical hand telescopic cylinder and the bidirectional module to drive the unloading mechanical hand through the controller, the first battery cell assembly can be automatically moved from the winding needle to the shaping device, without manual operation, saving labor cost and improving production efficiency.

[0116] In some embodiments of the present application, the shaping device can include a pre-pressing assembly and / or a cold-pressing assembly.

[0117] For example, as shown in FIG. 2, the shaping device can include a pre-pressing assembly 121 and a cold-pressing assembly 122.

[0118] The pre-pressing assembly can be arranged downstream of the winding needle and can be used to pre-press the first battery cell assembly to obtain a pre-pressed first battery cell assembly.

[0119] The pre-pressing assembly can be provided with a pre-pressing station, which can be a position for pre-pressing the battery cell assembly.

[0120] The pre-pressing assembly can be used to pre-press the first battery cell assembly when it reaches the pre-pressing station to obtain a pre-pressed first battery cell assembly.

[0121] The cold-pressing assembly can be arranged downstream of the pre-pressing assembly and can be used to cold-press the first battery cell assembly to obtain a cold-pressed first battery cell assembly.

[0122] The cold-pressing assembly can be provided with a cold-pressing station, which can be a position for cold-pressing the battery cell assembly.

[0123] The cold-pressing assembly can be used to cold-press the first battery cell assembly when it reaches the cold-pressing station to obtain a cold-pressed first battery cell assembly.

[0124] Thus, the measurement light curtain can be arranged at the pre-pressing device to measure the tab width of the pre-pressed battery cell assembly, or arranged at the cold-pressing device to measure the tab width of the cold-pressed battery cell assembly, and the arrangement of the measurement light curtain is more flexible.

[0125] In addition, since the battery cell assembly is pre-pressed before cold-pressing in the production process, the measurement light curtain arranged at the pre-pressing device can measure the tab width more timely, so as to adjust the winding needle diameter more timely and avoid producing more tab misaligned battery cell assemblies.

[0126] In some embodiments of the present application, as shown in FIGS. 5a and 5b, the pre-pressing assembly can include a sensor 1211, a transplanting module 1212, a pressing mechanism 1213, a conveying mechanism 1214 and a second lifting shaft 1215.

[0127] The inductor 1211 can be arranged at the target position, and the inductor 1211 can be electrically connected to the controller. The target position can be used to place the first battery cell assembly, and the target position can be a pre-pressing station. The inductor 1211 can be a battery cell material inductor, which can be used to detect whether the battery cell assembly is placed at the target position.

[0128] The transplanting module 1212 can be mechanically connected to the pressing mechanism 1213, and the transplanting module 1212 can be electrically connected to the controller.

[0129] The conveying mechanism 1214 can be electrically connected to the controller. The conveying mechanism 1214 can include a logistics line belt.

[0130] The second lifting shaft 1215 can be mechanically connected to the pressing mechanism 1213, and the second lifting shaft 1215 can be electrically connected to the controller. Specifically, the two ends of the second lifting shaft 1215 can be mechanically connected to the pressing mechanism 1213 and the conveying mechanism 1214, respectively.

[0131] The controller can be used to control the inductor 1211, the transplanting module 1212, the conveying mechanism 1214, and the second lifting shaft 1215. The transplanting module 1212 and the second lifting shaft 1215 can be used to drive the pressing mechanism 1213.

[0132] The pressing mechanism 1213 can move horizontally along the conveying direction of the conveying mechanism 1214 under the driving of the transplanting module 1212, and the initial position of the pressing mechanism 1213 can be located at the leftmost side. When the battery cell assembly is placed at the pre-pressing station, the controller can control the transplanting module 1212 to drive the pressing mechanism 1213 to move from the leftmost side to above the pre-pressing station.

[0133] In this way, by using the inductor, the transplanting module, the pressing mechanism, the conveying mechanism, and the second lifting shaft, the first battery cell assembly can be automatically pre-pressed without manual operation, thereby saving labor costs and improving production efficiency.

[0134] In some embodiments of the present application, the controller can also be used to control the conveying mechanism 1214 to convey the first battery cell assembly to the target position, control the inductor 1211 to detect whether the first battery cell assembly is placed at the target position, in the case that the first battery cell assembly is placed at the target position, control the transplanting module 1212 to drive the pressing mechanism 1213 to move above the target position, and control the second lifting shaft 1215 to drive the pressing mechanism 1213 to pre-press the first battery cell assembly to obtain the pre-pressed first battery cell assembly.

[0135] Specifically, the controller can first control the feeding mechanism 1214 to deliver the first battery cell assembly to the pre-pressing station, and control the inductor 1211 to detect whether the first battery cell assembly is placed at the pre-pressing station. If the first battery cell assembly is placed at the pre-pressing station, the controller can control the transplanting module 1212 to drive the pressing mechanism 1213 to move above the pre-pressing station, and control the second lifting shaft 1215 to drive the pressing mechanism 1213 to descend to a preset position to press and hold the first battery cell assembly.

[0136] In some embodiments of the present application, as shown in FIGS. 5a and 5b, the pre-pressing assembly can further include a pressing cylinder 1216, which can be mechanically connected with the pressing mechanism 1213 and electrically connected with the controller, and can be used to drive the pressing mechanism 1213 to hold the first battery cell assembly under the control of the controller.

[0137] Therefore, the controller can first control the feeding mechanism 1214 to deliver the first battery cell assembly to the pre-pressing station, and control the inductor 1211 to detect whether the first battery cell assembly is placed at the pre-pressing station. If the first battery cell assembly is placed at the pre-pressing station, the controller can control the transplanting module 1212 to drive the pressing mechanism 1213 to move above the pre-pressing station, and control the second lifting shaft 1215 to drive the pressing mechanism 1213 to descend to a preset position to press and hold the first battery cell assembly under the control of the controller.

[0138] The measuring curtain can automatically measure the first tab width of the first battery cell assembly during the holding process. After the holding and measurement are completed, the controller can control the pressing cylinder 1216 and the second lifting shaft 1215 to drive the pressing mechanism 1213 to ascend to the initial position, and upload the first tab width to the controller 140. The controller can also control the transplanting module 1212 to drive the pressing mechanism 1213 to move horizontally to the initial position, and control the feeding mechanism 1214 to deliver the first battery cell assembly to the next station, which can be a cold-pressing station.

[0139] In this way, the controller can control the feeding mechanism, the inductor, the transplanting module, the pressing mechanism, and the second lifting shaft to automatically pre-press the first battery cell assembly, without human operation, thereby saving labor costs and improving production efficiency.

[0140] In some embodiments of the present application, as shown in FIGS. 5a and 5b, the pre-pressing assembly can further include a bottom plate 1217, which can be arranged below the feeding mechanism 1214, and the pressing mechanism 1213 can be arranged above the feeding mechanism 1214.

[0141] Therefore, the transmitting end 111 can be arranged on the pressing mechanism 1213, and the receiving end 112 can be arranged on the bottom plate 1217.

[0142] Specifically, the transmitting end 111 can be mechanically connected with the pressing mechanism 1213, and the receiving end 112 can be mechanically connected with the bottom plate 1217.

[0143] For example, as shown in FIG. 5a, the transmitting end 111 is arranged on the pressing mechanism 1213, and the receiving end 112 is arranged on the bottom plate 1217.

[0144] In this way, the measuring light curtain is arranged on the pre-pressing assembly, so that the tab width can be measured during the pre-pressing process, time is saved, production efficiency is improved, and the positions of the transmitting end and the receiving end can be flexibly arranged.

[0145] In some embodiments of the present application, the pre-pressing assembly can further include a bottom plate, the bottom plate can be arranged below the conveying mechanism, and the pressing mechanism can be arranged above the conveying mechanism.

[0146] Therefore, the transmitting end can be arranged on the bottom plate, and the receiving end can be arranged on the pressing mechanism.

[0147] Specifically, the transmitting end can be mechanically connected with the bottom plate, and the receiving end can be mechanically connected with the pressing mechanism.

[0148] In this way, the measuring light curtain is arranged on the pre-pressing assembly, so that the tab width can be measured during the pre-pressing process, time is saved, production efficiency is improved, and the positions of the transmitting end and the receiving end can be flexibly arranged.

[0149] In some embodiments of the present application, as shown in FIG. 5a and FIG. 5b, the pre-pressing assembly can further include a transplanting module fixing member 1218, a connecting plate 1219, a lifting shaft motor 1220, a lifting shaft transmission protection cover 1221, a pressing mechanism lifting rod 1222, a pressing plate 1223, a linear bearing 1224, a pressing plate lifting rod 1225, a gas cylinder mounting seat 1226, a gas cylinder lifting rod 1227, a first conveying mechanism side fixing plate 1228, a conveying mechanism motor 1229, a conveying mechanism driving shaft 1230, a second conveying mechanism side fixing plate 1231, a throttle valve 1232, and a conveying mechanism driven shaft 1233. The connecting plate 1219 can be used to connect the second lifting shaft 1215 and the pressing mechanism 1213.

[0150] In some embodiments of the present application, as shown in FIG. 6, the control flow of the controller can include S601-S610. Specifically as follows:

[0151] S601, control the first lifting shaft drive to move the blanking mechanical arm to the blanking position in the winding work station.

[0152] S602, control the mechanical arm telescopic cylinder to drive the discharging mechanical arm to pick up the first battery cell assembly from the winding station.

[0153] S603, control the first lifting shaft to drive the discharging mechanical arm to move the first battery cell assembly to the battery cell stretching station.

[0154] S604, control the bidirectional module to drive the discharging mechanical arm to stretch the first battery cell assembly.

[0155] S605, control the first lifting shaft to drive the discharging mechanical arm to move the first battery cell assembly to the conveying mechanism of the pre-pressing assembly.

[0156] S606, control the conveying mechanism to convey the first battery cell assembly to the pre-pressing station.

[0157] S607, control the inductor to detect whether the first battery cell assembly is placed at the pre-pressing station.

[0158] If yes, execute S608; if no, return to execute S606.

[0159] S608, control the transplanting module to drive the pressing mechanism to move horizontally above the pre-pressing station.

[0160] S609, control the second lifting shaft to drive the pressing mechanism to descend to the preset position, so that the first battery cell assembly is initially formed.

[0161] S610, control the mechanical arm telescopic cylinder to drive the discharging mechanical arm to loosen and extract from the first battery cell assembly.

[0162] S611, control the mechanical arm telescopic cylinder to drive the discharging mechanical arm to return to the initial position.

[0163] S612, control the pressing cylinder to drive the pressing mechanism to descend to the preset position and keep pressure.

[0164] S613, control the measuring light curtain to measure the first tab width of the first battery cell assembly.

[0165] S614, judge whether the pressure keeping and measurement are completed.

[0166] If yes, execute S615; if no, return to execute S614.

[0167] S615, obtain the first tab width, and control the pressing cylinder and the second lifting shaft to return to the initial position.

[0168] S616, control the conveying mechanism to convey the first battery cell assembly to the cold-pressing station.

[0169] The specific process of S601-S616 can be referred to the above-mentioned embodiments, which will not be described here.

[0170] In the embodiments of the present application, the shaping device of the winding machine is provided with a measuring light curtain, so that the tab width can be automatically measured by the measuring light curtain without stopping the device for manual measurement of the tab width. Moreover, the tab width can be automatically uploaded to the upper computer without manual uploading, and then the tab misalignment amount can be calculated based on the tab width, and the winding needle diameter can be adjusted based on the tab misalignment amount, so that the device can be automatically adjusted in real time according to the incoming material fluctuation without manual adjustment of the battery cell.

[0171] The embodiments of the present application also provide a winding method, and the execution subject of the winding method can be a winding machine. The winding method provided by the embodiments of the present application is introduced below.

[0172] FIG. 7 is a flowchart of a winding method provided by some embodiments of the present application.

[0173] As shown in FIG. 7, the winding method can include the following steps:

[0174] S710, winding the tab sheet by the winding needle to obtain a first battery cell assembly;

[0175] S720, shaping the first battery cell assembly by the shaping device to obtain a shaped first battery cell assembly;

[0176] S730, under the condition that the shaped first battery cell assembly is located at the shaping device, sending a first electric signal to the controller by the measuring light curtain;

[0177] S740, determining a first tab width based on the first electric signal by the controller;

[0178] S750, determining a first tab misalignment amount of the shaped first battery cell assembly based on the first tab width by the controller;

[0179] S760, adjusting the diameter of the winding needle based on the first tab misalignment amount by the controller;

[0180] S770, winding the tab sheet by the winding needle with the adjusted diameter to obtain a second battery cell assembly by the controller.

[0181] Here, the first electric signal can be used to represent the first tab width of the shaped first battery cell assembly, and the measuring light curtain can be arranged at the shaping device. The shaping device can be arranged downstream of the winding needle.

[0182] The controller can determine the first tab width corresponding to the first electric signal based on the correspondence between the electric signal and the tab width. Specifically, the controller can pre-acquire electric signals and tab widths corresponding to a plurality of tabs respectively, fit the plurality of electric signals and the tab widths corresponding thereto respectively to obtain the correspondence between the electric signal and the tab width.

[0183] The first tab width can include an actual width of each of the at least one tab of the first battery cell assembly.

[0184] The first tab misalignment amount can include a misalignment amount of each of the at least one tab of the first battery cell assembly.

[0185] Specifically, for each tab, a standard tab width of the tab can be pre-set, and the misalignment amount of the tab can be equal to a difference between the actual width of the tab and the standard tab width.

[0186] Thus, the tab width of the shaped battery cell assembly can be accurately measured by the light curtain, so as to accurately determine the tab misalignment amount. Based on this, the diameter of the winding needle can be adjusted based on the tab misalignment amount of the shaped previous battery cell assembly (i.e., the first battery cell assembly), so as to reduce the tab misalignment amount of the current battery cell assembly (i.e., the second battery cell assembly) in the process of winding the current battery cell assembly, thereby realizing closed-loop adjustment and effectively reducing the tab misalignment.

[0187] In some embodiments of the present application, before S760, the method can further include:

[0188] obtaining, by the controller, the first tab parameter;

[0189] determining, by the controller based on a first preset correspondence relationship, a second tab misalignment amount corresponding to the first tab parameter;

[0190] Based on this, S760 can include:

[0191] adjusting, by the controller, the diameter of the winding needle based on the first tab misalignment amount, in a case where the second tab misalignment amount is within a first preset range.

[0192] Here, the first tab parameter can be a parameter used to generate the tab of the second battery cell assembly.

[0193] Exemplarily, the first tab parameter can include at least one of a thickness of the tab, a tab pitch of the tab, and a pressure for rolling the tab.

[0194] The first preset correspondence relationship can include a correspondence relationship between the tab parameter and the tab misalignment amount. The first preset correspondence relationship can be pre-calibrated. The first correspondence relationship can be used to predict, based on the tab parameter of the tab, a tab misalignment amount of a battery cell assembly that can be obtained after the tab is wound.

[0195] Exemplarily, the first preset correspondence relationship can be in the form of a table, a curve, or a formula.

[0196] The second tab misalignment amount can be a minimum value of the tab misalignment amount of the second battery cell assembly predicted based on the first tab parameter.

[0197] The first preset range can be an acceptable dislocation amount range. The first preset range can be set according to actual needs.

[0198] Specifically, if the second tab dislocation amount is in the first preset range, it can be considered that the tab dislocation amount of the battery cell assembly with the smallest tab dislocation amount produced by using the current tab is within the acceptable dislocation amount range, and thus the winding process can be entered. If the second tab dislocation amount exceeds the first preset range, it can be considered that the tab dislocation amount of the battery cell assembly with the smallest tab dislocation amount produced by using the current tab still exceeds the acceptable dislocation amount range, and thus the winding process is temporarily not entered.

[0199] In this way, the tab dislocation amount of the battery cell assembly that can be produced can be predicted based on the tab parameters, and the winding is performed again in a case where the tab dislocation amount is determined to be within the acceptable dislocation amount range, so as to avoid producing a battery cell assembly with an excessive tab dislocation amount and causing resource waste.

[0200] In some embodiments of the present application, the winding machine can further include an embossing roller and a tension roller, the embossing roller can be used to roll the tab used to generate the second battery cell assembly, and the tension roller can be used to stretch the tab used to generate the second battery cell assembly.

[0201] Based on this, after the controller determines the second tab dislocation amount corresponding to the first tab parameters based on the first preset correspondence, the method can further include:

[0202] In a case where the second tab dislocation amount exceeds the first preset range, the controller adjusts the pressure of the embossing roller and / or the tension of the tension roller.

[0203] Here, the greater the pressure of the embossing roller, the smaller the thickness of the tab after rolling, and the greater the tension of the tension roller, the smaller the thickness of the tab after stretching.

[0204] Specifically, if the second tab dislocation amount exceeds the first preset range, it can be considered that the tab dislocation amount of the battery cell assembly with the smallest tab dislocation amount produced by using the current tab still exceeds the acceptable dislocation amount range, and thus the thickness of the tab used to generate the second battery cell assembly can be changed by adjusting the pressure of the embossing roller and / or the tension of the tension roller, so as to reduce the dislocation amount of the second battery cell assembly.

[0205] In some embodiments of the present application, after adjusting the pressure of the embossing roller and / or the tension of the tension roller by the controller, the controller can reacquire the tab parameter for generating the tab of the second battery cell assembly. After adjusting the pressure of the embossing roller and / or the tension of the tension roller by the controller, the tab parameter will also change. The controller can determine whether the tab ear displacement corresponding to the changed tab parameter is within the first preset range based on the first preset correspondence relationship. If yes, the winding process can be entered. If not, the pressure of the embossing roller and / or the tension of the tension roller adjusted by the controller can be adjusted again until the tab ear displacement corresponding to the changed tab parameter is within the first preset range.

[0206] In this way, through the above process, in the case that the tab ear displacement of the battery cell assembly produced using the current tab exceeds the acceptable displacement range, the thickness of the tab can be changed by adjusting the pressure of the embossing roller and / or the tension of the tension roller by the controller, thereby reducing the tab ear displacement of the battery cell assembly and avoiding the production of battery cell assemblies with excessive tab ear displacement, thereby avoiding resource waste.

[0207] In some embodiments of the present application, after the controller determines the second tab ear displacement corresponding to the first tab parameter based on the first preset correspondence relationship, the method can further include:

[0208] The tab is wound by the winding needle to obtain a second battery cell assembly;

[0209] The second battery cell assembly is shaped by the shaping device to obtain a shaped second battery cell assembly;

[0210] In the case that the shaped second battery cell assembly is located at the shaping device, the second electric signal is sent to the controller by the measuring light curtain;

[0211] The second tab width is determined by the controller based on the second electric signal;

[0212] The third tab ear displacement of the shaped second battery cell assembly is determined by the controller based on the second tab width;

[0213] In the case that the third tab ear displacement is within the second preset range, the first preset correspondence relationship is updated by the controller based on the third tab ear displacement.

[0214] The second electric signal can be used to represent the second tab width of the shaped second battery cell assembly.

[0215] Here, the specific process of determining the third tab ear displacement of the second battery cell assembly can be the same as the specific process of determining the first tab ear displacement of the first battery cell assembly, which will not be repeated here.

[0216] Any tab misalignment amount in the second preset range can be less than the second tab misalignment amount.

[0217] The third tab misalignment amount can be an actual tab misalignment amount of the second battery cell assembly.

[0218] Specifically, the third tab misalignment amount being in the second preset range can represent that the actual tab misalignment amount of the reshaped second battery cell assembly is less than the second tab misalignment amount predicted based on the first preset correspondence relationship, and the first preset correspondence relationship should be used to predict the minimum tab misalignment amount. The third tab misalignment amount being less than the second tab misalignment amount can represent that the first preset correspondence relationship cannot accurately predict the minimum tab misalignment amount, and thus the first preset correspondence relationship needs to be recalibrated.

[0219] In addition, if the third tab misalignment amount is not in the second preset range, the first preset correspondence relationship does not need to be updated.

[0220] In this way, through the above process, the first preset correspondence relationship can be recalibrated when the actual tab misalignment amount of the second battery cell assembly is less than the minimum tab misalignment amount predicted based on the first preset correspondence relationship, so that the accuracy of tab misalignment amount prediction can be improved, and battery cell assemblies with tab misalignment amounts exceeding the standard can be avoided.

[0221] In some embodiments of the present application, the above process of updating the first preset correspondence relationship based on the third tab misalignment amount by the controller when the third tab misalignment amount is in the second preset range can include:

[0222] When the third tab misalignment amount is in the second preset range, adding the third tab misalignment amount and its corresponding first tab parameter to the fitting sample set by the controller;

[0223] When the number of fitting samples included in the fitting sample set reaches a preset threshold, fitting the fitting samples in the fitting sample set by the controller to obtain a second preset correspondence relationship;

[0224] Updating the first preset correspondence relationship to the second preset correspondence relationship by the controller.

[0225] Here, the fitting sample set can be used to save actual tab misalignment amounts less than the predicted tab misalignment amount and their corresponding tab parameters.

[0226] Specifically, after adding a fitting sample to the fitting sample set each time, it can be judged whether the number of fitting samples included in the fitting sample set reaches a preset threshold. If yes, the fitting samples in the fitting sample set can be fitted by the controller to obtain a new correspondence between the tab parameters and the tab misplacement amount, that is, a second preset correspondence, and then the first preset correspondence is updated to the second preset correspondence; if not, it can be waited until the next time a fitting sample is added to the fitting sample set, and then it is judged again whether the number of fitting samples included in the fitting sample set reaches the preset threshold.

[0227] The preset threshold can be set according to actual needs. Exemplarily, the preset threshold can be 3.

[0228] In this way, through the above process, fitting samples can be collected during the production of the battery assembly, and after the number of fitting samples reaches the preset threshold, the correspondence between the tab parameters and the tab misplacement amount is re-fitted, thereby realizing automatic adjustment of the logic of predicting the tab misplacement amount and improving the prediction accuracy of the tab misplacement amount.

[0229] In some embodiments of the present application, S760 can include:

[0230] determining, by the controller, a first diameter change corresponding to the first tab misplacement amount based on the third preset correspondence;

[0231] adjusting, by the controller, the diameter of the winding needle based on the first diameter change.

[0232] Here, the third preset correspondence can include a correspondence between the tab misplacement amount and the diameter change of the winding needle. The third preset correspondence can be pre-calibrated. Specifically, the correspondence between the tab misplacement amount and the diameter change of the winding needle can be pre-established in a statistical manner to obtain the third preset correspondence, or the diameter change of the winding needle under different tab misplacement amounts can be calculated using a trial method.

[0233] The third correspondence can be used to determine the diameter change of the winding needle based on the tab misplacement amount.

[0234] Exemplarily, the form of the third preset correspondence can be a table, a curve or a formula.

[0235] In this way, the diameter change of the winding needle corresponding to the first tab misplacement amount can be determined through the pre-calibrated third preset correspondence, thereby realizing accurate adjustment of the diameter of the winding needle and effectively reducing the tab misplacement amount of the battery assembly.

[0236] In some embodiments of the present application, after S750, the method can further include:

[0237] In a case where the third tab misalignment amount exceeds the third preset range, the controller obtains a plurality of tab misalignment amounts and respective corresponding diameter change amounts thereof;

[0238] The controller fits the plurality of tab misalignment amounts and respective corresponding diameter change amounts thereof to obtain a fourth preset corresponding relationship;

[0239] The controller updates the third preset corresponding relationship to the fourth preset corresponding relationship.

[0240] Here, the third preset range can be a preset acceptable tab misalignment amount range.

[0241] Specifically, if the actual tab misalignment amount of the second battery cell assembly, i.e., the third tab misalignment amount, exceeds the preset acceptable tab misalignment amount range, it can be understood that after adjusting the diameter of the winding needle, the tab misalignment amount of the produced second battery cell assembly is still out of standard, and thus it can be considered that the first diameter change amount of the winding needle is inaccurate, and the first diameter change amount is determined based on the third preset corresponding relationship, and thus it can be considered that the third preset corresponding relationship is inaccurate, and the corresponding relationship between the tab misalignment amount and the diameter change amount of the winding needle needs to be recalibrated.

[0242] Therefore, a plurality of tab misalignment amounts and respective corresponding diameter change amounts thereof can be collected, and the diameter change amount corresponding to the tab misalignment amount can refer to the diameter change amount of the winding needle based on the tab misalignment amount of the previous battery cell assembly, which can make the tab misalignment amount of the subsequent battery cell assembly not out of standard.

[0243] Fitting the plurality of tab misalignment amounts and respective corresponding diameter change amounts thereof can obtain a new corresponding relationship between the tab misalignment amount and the diameter change amount of the winding needle, i.e., the fourth preset corresponding relationship. Then the third preset corresponding relationship can be updated to the fourth preset corresponding relationship.

[0244] In addition, if the third tab misalignment amount does not exceed the third preset range, the third preset corresponding relationship does not need to be updated.

[0245] In this way, through the above process, in a case where the first diameter change amount determined based on the third preset corresponding relationship is inaccurate, the corresponding relationship between the tab misalignment amount and the diameter change amount of the winding needle can be recalibrated, thereby realizing automatic adjustment of the logic of determining the diameter change amount and improving the accuracy of the diameter adjustment of the winding needle.

[0246] Embodiments of the present application also provide a winding method, and the execution subject of the winding method can be a controller in a winding machine. The winding method provided by embodiments of the present application is introduced below.

[0247] FIG. 8 is a flowchart of a winding method provided by some embodiments of the present application.

[0248] As shown in Figure 8, the winding method may include the following steps:

[0249] S810, determine the width of the first tab of the first cell assembly after shaping based on the first electrical signal;

[0250] S820, determine the misalignment of the first tab of the first cell assembly after shaping based on the width of the first tab;

[0251] S830, adjusts the diameter of the winding needle based on the misalignment of the first electrode tab;

[0252] S840 controls the adjustment of the diameter of the winding pin to wind the electrode sheet, thus obtaining the second cell assembly.

[0253] The first electrical signal can be a signal sent to the controller via a measuring light curtain when the first shaped battery cell assembly is located at the shaping device. The first electrical signal can be used to characterize the width of the first tab of the shaped battery cell assembly. The first battery cell assembly can be obtained by winding a needle around an electrode sheet, and the shaped first battery cell assembly can be obtained by shaping the first battery cell assembly using a shaping device. The measuring light curtain can be located at the shaping device, which can be downstream of the winding needle.

[0254] The specific processes of S810-S840 can be found in the above embodiments, and will not be repeated here.

[0255] Therefore, the tab width of the shaped cell assembly can be accurately measured by measuring the light curtain, thereby accurately determining the tab misalignment. Based on this, the diameter of the winding needle can be adjusted based on the tab misalignment of the previous cell assembly (i.e., the first cell assembly) so as to reduce the tab misalignment of the current cell assembly (i.e., the second cell assembly) during the winding process, thus realizing closed-loop regulation and effectively reducing tab misalignment.

[0256] To better describe the entire solution, based on the above embodiments, a specific example is given as shown in Figure 9. The winding method may include S901-S913, which will be explained in detail below.

[0257] S901, Obtain the first electrode parameters used to generate the electrode of the second cell assembly.

[0258] S902, based on the first preset correspondence, determine the second electrode misalignment amount corresponding to the first electrode parameters.

[0259] S903, determine whether the misalignment of the second electrode ear is within the first preset range.

[0260] If yes, then execute S904; otherwise, execute S913.

[0261] S904, acquire a first tab misplacement amount of the first battery cell assembly.

[0262] S905, determine a first diameter change amount corresponding to the first tab misplacement amount based on a third preset correspondence relationship.

[0263] S906, adjust the diameter of the winding needle based on the first diameter change amount.

[0264] S907, control the winding needle with the adjusted diameter to wind the tab to obtain a second battery cell assembly.

[0265] S908, determine a third tab misplacement amount of the second battery cell assembly.

[0266] S909, determine whether the third tab misplacement amount is within a second preset range.

[0267] If yes, execute S910; if no, end.

[0268] S910, update the first preset correspondence relationship based on the third tab misplacement amount.

[0269] S911, determine whether the third tab misplacement amount exceeds a third preset range.

[0270] If yes, execute S912; if no, end.

[0271] S912, update the third preset correspondence relationship.

[0272] S913, adjust the pressure of the embossing roller and / or the tension of the tension roller, and return to execute S901.

[0273] The specific process of S901-S913 can refer to the above embodiments, which will not be repeated here.

[0274] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the application, and equivalent components can be substituted therefor, especially, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A winding machine comprising: roll a needle for winding a pole piece to obtain a first battery assembly; a shaping device arranged downstream of the winding needle for shaping the first battery assembly to obtain a shaped first battery assembly; a measuring light curtain arranged downstream of the shaping device and electrically connected to a controller for sending a first electrical signal to the controller when the shaped first battery assembly is located at the shaping device, the first electrical signal being used to represent a first tab width of the shaped first battery assembly; the controller is configured to determine the first tab width based on the first electrical signal, determine a first tab misalignment amount of the shaped first battery assembly based on the first tab width, adjust the diameter of the winding needle based on the first tab misalignment amount, and control the winding needle with the adjusted diameter to wind a pole piece to obtain a second battery assembly.

2. The winding machine of claim 1, wherein, The measuring light curtain comprises: a transmitting end arranged opposite to a receiving end and spaced apart by a preset distance, for transmitting measuring light to the receiving end, and a position between the transmitting end and the receiving end is used to place a tab of the shaped first battery assembly; the receiving end is electrically connected to the controller, for receiving the measuring light passing through the tab, and generating a first electrical signal based on the measuring light passing through the tab, and sending the first electrical signal to the controller.

3. The winding machine of claim 2, wherein, The winding machine further comprises: a feeding assembly arranged between the winding needle and the shaping device, for moving the first battery assembly from the winding needle to the shaping device.

4. The winding machine of claim 3, wherein, The feeding assembly comprises a first lifting shaft, a feeding manipulator, a manipulator telescopic cylinder and a bidirectional module; the first lifting shaft, the manipulator telescopic cylinder and the bidirectional module are respectively electrically connected to the controller; and the first lifting shaft, the manipulator telescopic cylinder and the bidirectional module are respectively mechanically connected to the feeding manipulator.

5. The winding machine according to claim 4, characterized in that, The controller is further configured to control the first lifting shaft to drive the feeding manipulator to move to the winding needle, control the manipulator telescopic cylinder to drive the feeding manipulator to clamp the first battery assembly from the winding needle, control the bidirectional module to drive the feeding manipulator to stretch the first battery assembly, and control the first lifting shaft to drive the feeding manipulator to move the stretched first battery assembly to the shaping device.

6. The winding machine of claim 3, wherein, The shaping device comprises a pre-pressing assembly and / or a cold-pressing assembly; the pre-pressing assembly is arranged downstream of the winding needle and is configured to pre-press the first battery assembly to obtain a pre-pressed first battery assembly; the cold-pressing assembly is arranged downstream of the pre-pressing assembly and is configured to cold-press the first battery assembly to obtain a cold-pressed first battery assembly.

7. The winding machine of claim 6, wherein, The pre-pressing assembly comprises an inductor, a transplanting module, a pressing mechanism, a conveying mechanism and a second lifting shaft; The inductor is arranged at a target position and electrically connected with the controller, and the target position is used for placing the first battery cell assembly; the transplanting module is mechanically connected with the pressing mechanism and electrically connected with the controller; the conveying mechanism is electrically connected with the controller; the second lifting shaft is mechanically connected with the pressing mechanism and electrically connected with the controller.

8. The winding machine of claim 7, wherein, The controller is further configured to control the conveying mechanism to convey the first battery cell assembly to the target position, control the inductor to detect whether the first battery cell assembly is placed at the target position, and in the case that the first battery cell assembly is placed at the target position, control the transplanting module to drive the pressing mechanism to move above the target position, and control the second lifting shaft to drive the pressing mechanism to pre-press the first battery cell assembly to obtain the pre-pressed first battery cell assembly.

9. The winding machine of claim 7, wherein, The pre-pressing assembly further comprises a bottom plate, the bottom plate is arranged below the conveying mechanism, and the pressing mechanism is arranged above the conveying mechanism. The transmitting end is arranged on the pressing mechanism, and the receiving end is arranged on the bottom plate.

10. The winding machine of claim 7, wherein, The pre-pressing assembly further comprises a bottom plate, the bottom plate is arranged below the conveying mechanism, and the pressing mechanism is arranged above the conveying mechanism. The transmitting end is arranged on the bottom plate, and the receiving end is arranged on the pressing mechanism.

11. A winding method applied to the winding machine of any one of claims 1-10, the method comprising: winding a pole piece by a winding needle to obtain a first battery cell assembly; shaping the first battery cell assembly by a shaping device arranged downstream of the winding needle to obtain a shaped first battery cell assembly; in the case that the shaped first battery cell assembly is at the shaping device, sending a first electric signal to a controller by a measuring light curtain, the first electric signal being used to represent a first tab width of the shaped first battery cell assembly, and the measuring light curtain being arranged on the shaping device; determining the first tab width by the controller based on the first electric signal; determining a first tab misalignment amount of the shaped first battery cell assembly by the controller based on the first tab width; adjusting a diameter of the winding needle by the controller based on the first tab misalignment amount; controlling the winding needle with the adjusted diameter to wind a pole piece to obtain a second battery cell assembly.

12. The method of claim 11, wherein, Before the adjusting of the diameter of the winding needle by the controller based on the first tab misalignment amount, the method further comprises: obtaining a first pole piece parameter by the controller, the first pole piece parameter being a parameter of a pole piece used to generate the second battery cell assembly; determining a second tab misalignment amount corresponding to the first pole piece parameter based on a first preset corresponding relationship by the controller, the first preset corresponding relationship comprising a corresponding relationship between a pole piece parameter and a tab misalignment amount; the adjusting of the diameter of the winding needle by the controller based on the first tab misalignment amount comprises: in the case that the second tab misalignment amount is within a first preset range, adjusting the diameter of the winding needle by the controller based on the first tab misalignment amount.

13. The method of claim 12, wherein, The winding machine further comprises an embossing roller for rolling the pole piece for generating the second battery cell assembly and a tension roller for stretching the pole piece for generating the second battery cell assembly. The method further comprises: In a case where the second tab misalignment amount exceeds the first preset range, adjusting, by the controller, the pressure of the embossing roller and / or the tension of the tension roller.

14. The method of claim 12, wherein, After determining, by the controller, the first tab misalignment amount of the first battery cell assembly based on the first tab width, the method further comprises: winding the pole piece by a winding needle to obtain a second battery cell assembly; shaping the second battery cell assembly by a shaping device to obtain a shaped second battery cell assembly; In a case where the shaped second battery cell assembly is located at the shaping device, sending, by a measurement light curtain, a second electrical signal to the controller, the second electrical signal being used to represent a second tab width of the shaped second battery cell assembly; determining, by the controller, the second tab width based on the second electrical signal; determining, by the controller, a third tab misalignment amount of the shaped second battery cell assembly based on the second tab width; In a case where the third tab misalignment amount is within a second preset range, updating, by the controller, the first preset correspondence relationship based on the third tab misalignment amount.

15. The method of claim 14, wherein, The updating, by the controller, the first preset correspondence relationship based on the third tab misalignment amount in the case where the third tab misalignment amount is within the second preset range comprises: In a case where the third tab misalignment amount is within the second preset range, adding, by the controller, the third tab misalignment amount and its corresponding first pole piece parameter to a fitting sample set; In a case where a number of fitting samples included in the fitting sample set reaches a preset threshold, fitting, by the controller, the fitting samples in the fitting sample set to obtain a second preset correspondence relationship; updating, by the controller, the first preset correspondence relationship to the second preset correspondence relationship.

16. The method of any one of claims 11-15, wherein, The adjusting, by the controller, the diameter of the winding needle based on the first tab misalignment amount comprises: determining, by the controller, a first diameter change amount corresponding to the first tab misalignment amount based on a third preset correspondence relationship, the third preset correspondence relationship comprising a correspondence relationship between tab misalignment amounts and diameter change amounts of the winding needle; adjusting, by the controller, the diameter of the winding needle based on the first diameter change amount.

17. The method of claim 14, wherein, After determining, by the controller, the first tab misalignment amount of the shaped first battery cell assembly based on the first tab width, the method further comprises: In a case where the third tab misalignment amount exceeds a third preset range, obtaining, by the controller, a plurality of tab misalignment amounts and their respectively corresponding diameter change amounts; fitting, by the controller, the plurality of tab misalignment amounts and their respectively corresponding diameter change amounts to obtain a fourth preset correspondence relationship; updating, by the controller, the third preset correspondence relationship to the fourth preset correspondence relationship.

18. A winding method applied to a controller in the winding machine according to any one of claims 1-10, the method comprising: determining a first tab width of a first shaped cell assembly based on a first electrical signal, the first electrical signal being an electrical signal sent to the controller by a measuring light curtain when the first shaped cell assembly is located at a shaping device, the first electrical signal being used to characterize the first tab width of the first shaped cell assembly, the first cell assembly being obtained by winding a tab by a winding needle, the first shaped cell assembly being obtained by shaping the first cell assembly by a shaping device, the measuring light curtain being arranged at the shaping device, the shaping device being arranged downstream of the winding needle; determining a first tab misalignment amount of the first shaped cell assembly based on the first tab width; adjusting a diameter of the winding needle based on the first tab misalignment amount; controlling the winding needle with the adjusted diameter to wind the tab to obtain a second cell assembly.

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