Winding apparatus and battery production device

Abstract

The present application relates to a winding apparatus and a battery production device. The winding apparatus comprises: a first slitting mechanism, which is configured to slit an electrode sheet to be slit into at least two electrode sheets in the length direction of the electrode sheet to be slit; a second slitting mechanism, which is configured to slit a separator to be slit into at least two separators in the length direction of the separator to be slit; and a winding mechanism, which is configured to wind the slit electrode sheets and the slit separators in a one-to-one correspondence mode to form at least two electrode assemblies. In the present application, a first slitting mechanism can slit an electrode sheet to be slit into at least two electrode sheets, and a second slitting mechanism can slit a separator to be slit into at least two separators, such that the electrode sheets and the separators can be stacked in a one-to-one correspondence mode, and then wound by a winding mechanism to simultaneously form at least two electrode assemblies, effectively improving the winding efficiency of the electrode assemblies, thereby improving the overall production efficiency of batteries.

Description

A winding device and battery production equipment

[0001] Related applications

[0002] This application claims priority to Chinese patent application filed on May 28, 2024, with application number 2024211889579, entitled "A winding device and battery production equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and in particular to a winding device and battery production equipment. Background Technology

[0004] Depending on the manufacturing process, battery cells can be divided into wound battery cells and stacked battery cells. Among them, wound battery cells require the positive electrode, separator and negative electrode to be wound to form an electrode assembly with a core structure.

[0005] However, the current electrode assembly winding process is inefficient, affecting the overall production efficiency of the battery.

[0006] Summary of the Invention

[0007] Based on this, this application provides a winding device and battery production equipment.

[0008] In a first aspect, this application provides a winding device, including a first slitting mechanism, a second slitting mechanism and a winding mechanism. The first slitting mechanism is used to slit the electrode sheet to be cut into at least two electrode sheets along the length direction of the electrode sheet to be cut, the second slitting mechanism is used to slit the diaphragm to be cut into at least two diaphragms along the length direction of the diaphragm to be cut, and the winding mechanism is used to wind the slitted electrode sheets and diaphragms in a one-to-one correspondence to form at least two electrode assemblies.

[0009] With the above structure, the first slitting mechanism can slit the electrode sheet to be cut into at least two electrode sheets, and the second slitting mechanism can slit the separator to be cut into at least two separators. Thus, each electrode sheet and each separator can be stacked in a one-to-one correspondence. After being wound by the winding mechanism, at least two electrode assemblies can be formed simultaneously, which effectively improves the winding efficiency of the electrode assemblies and thus improves the overall production efficiency of the battery.

[0010] In some embodiments, the electrode sheet to be cut includes a first electrode sheet to be cut and a second electrode sheet to be cut. The first slitting mechanism includes a first slitting component and a second slitting component. The first slitting component is used to slit the first electrode sheet to be cut into at least two first electrode sheets along the length direction. The second slitting component is used to slit the second electrode sheet to be cut into at least two second electrode sheets along the length direction. Among them, one of the first electrode sheet and the second electrode sheet is a positive electrode sheet, and the other is a negative electrode sheet.

[0011] With the above structure, the first and second electrode sheets to be cut can be cut separately to form each first electrode sheet and each second electrode sheet. The first electrode sheets, each second electrode sheet and the separator are then stacked and wound together to form multiple electrode assemblies, thereby improving production efficiency.

[0012] In some embodiments, the diaphragm to be cut includes a first diaphragm to be cut and a second diaphragm to be cut, and the second slitting mechanism includes a third slitting component and a fourth slitting component. The third slitting component is used to slit the first diaphragm to be cut into at least two first diaphragms along the length direction, and the fourth slitting component is used to slit the second diaphragm to be cut into at least two second diaphragms along the length direction. Each first electrode, each first diaphragm, each second electrode and each second diaphragm are sequentially wound to form at least two electrode assemblies.

[0013] With the above structure, the first diaphragm to be cut and the second diaphragm to be cut can be cut separately to form each first diaphragm and each second diaphragm. The first electrode, the first diaphragm, the second electrode and the second diaphragm are stacked and wound in sequence to form multiple electrode assemblies, thereby improving production efficiency.

[0014] In some embodiments, the winding apparatus further includes a separation mechanism disposed between the first slitting mechanism and the winding mechanism, and / or the second slitting mechanism and the winding mechanism along the material feeding direction. The separation mechanism is used to separate each first electrode, each second electrode, each first diaphragm and each second diaphragm along the width direction.

[0015] By setting up a separation mechanism, the first electrode, the second electrode, the first diaphragm, and the second diaphragm are separated after being cut, so as to facilitate subsequent winding operations and improve operational efficiency.

[0016] In some embodiments, the separation mechanism includes multiple sets of separation rollers, each set of separation rollers including at least two separation rollers, the rotation axes of the separation rollers in each set being angularly arranged, and / or, each separation roller in each set being configured as a tapered roller; wherein, each separation roller is used to support and separate each first electrode, each second electrode, each first diaphragm and each second diaphragm.

[0017] By setting a separation roller, while supporting each first electrode sheet, each second electrode sheet, each first diaphragm, and each second diaphragm, the separated first electrode sheet, each second electrode sheet, each first diaphragm, and each second diaphragm can be driven to separate, so as to facilitate subsequent winding operations.

[0018] In some embodiments, the winding apparatus further includes an unwinding mechanism, which is disposed upstream of the first slitting mechanism and the second slitting mechanism along the feeding direction, for unwinding the electrode sheet to be cut and the diaphragm to be cut.

[0019] By setting up an unwinding mechanism, the electrode sheets and diaphragms to be cut can be unwound, so as to facilitate their slitting.

[0020] In some embodiments, the winding apparatus includes a die-cutting mechanism disposed upstream of the first slitting mechanism along the feeding direction, and is used to die-cut tabs on the electrode sheet.

[0021] By setting up a die-cutting mechanism, the tab area of ​​the electrode sheet can be die-cut to form a tab, so as to facilitate the formation of the electrode assembly.

[0022] In some embodiments, the winding device further includes a correction mechanism, which is disposed downstream of the first slitting mechanism along the material feeding direction and is used to drive each electrode sheet to move along its width direction.

[0023] By setting up a correction mechanism, the positions of the first and second electrodes can be further adjusted, so that the first electrode, the first separator, the second electrode, and the second separator can maintain a high alignment accuracy, which helps to improve the quality of the battery cell.

[0024] In some embodiments, the winding apparatus further includes a tension mechanism for adjusting the tension of each electrode and each diaphragm.

[0025] Therefore, the tension mechanism can adjust the tension of each first electrode, each second electrode, each first diaphragm, and each second diaphragm, thereby ensuring that each first electrode, each second electrode, each first diaphragm, and each second diaphragm can be transported normally.

[0026] Secondly, this application also provides a battery manufacturing apparatus, including the winding device described above, which is used to wind stacked electrodes and separators to form an electrode assembly.

[0027] The aforementioned winding device and battery production equipment have a first slitting mechanism that can slit the electrode sheet to be cut into at least two electrode sheets, and a second slitting mechanism that can slit the separator to be cut into at least two separators. Thus, each electrode sheet and each separator can be stacked in a one-to-one correspondence. After being wound by the winding mechanism, at least two electrode assemblies can be formed simultaneously, effectively improving the winding efficiency of the electrode assemblies and thus improving the overall production efficiency of the battery. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0029] Figure 1 is a schematic diagram of the structure of a winding device according to one or more embodiments.

[0030] Figure 2 is a structural schematic diagram of the separation mechanism in a winding apparatus according to one or more embodiments.

[0031] Explanation of reference numerals in the attached drawings: 100, winding device; 10, first slitting mechanism; 20, second slitting mechanism; 30, winding mechanism; 40, separating mechanism; 50, unwinding mechanism; 60, correction mechanism; 70, tension mechanism; 11, first slitting assembly; 12, second slitting assembly; 21, third slitting assembly; 22, fourth slitting assembly; 41, separating roller. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0033] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0034] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0038] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0039] A battery cell is the smallest unit that makes up a battery. The structure of a battery cell typically includes a casing and an electrode assembly placed inside the casing. The electrode assembly is the part of the battery cell where the actual electrochemical reaction occurs. The electrode assembly is mainly formed by winding or stacking positive and negative electrode plates, and a separator is usually placed between the positive and negative electrode plates. When the positive electrode plate, separator, and negative electrode plate are stacked sequentially, a stacked electrode assembly is formed. Placing the stacked electrode assembly into a casing forms a stacked battery cell. Conversely, winding the stacked positive electrode plate, separator, and negative electrode plate forms a wound electrode assembly. Placing the wound electrode assembly into a casing forms a wound battery cell.

[0040] Currently, in the process of winding electrodes and separators to form electrode assemblies using a winding device, only one electrode assembly can typically be wound at a time. This results in low production capacity of the winding device and low winding efficiency of the electrode assemblies, ultimately affecting the overall production efficiency of the battery.

[0041] Based on the above considerations, in order to solve the problem of low efficiency in the current electrode assembly winding process, which affects the overall production efficiency of the battery, one or more embodiments of this application provide a winding device. The first slitting mechanism can slit the electrode sheet to be cut into at least two electrode sheets, and the second slitting mechanism can slit the separator to be cut into at least two separators. Thus, each electrode sheet and each separator can be stacked in a one-to-one correspondence. After being wound by the winding mechanism, at least two electrode assemblies can be formed simultaneously, which effectively improves the winding efficiency of the electrode assembly, thereby improving the overall production efficiency of the battery.

[0042] Referring to Figure 1, one embodiment of this application provides a winding device 100, including a first slitting mechanism 10, a second slitting mechanism 20, and a winding mechanism 30. The first slitting mechanism 10 is used to slit the electrode sheet to be cut into at least two electrode sheets along the length direction of the electrode sheet to be cut. The second slitting mechanism 20 is used to slit the diaphragm to be cut into at least two diaphragms along the length direction of the diaphragm to be cut. The winding mechanism 30 is used to wind each of the slitted electrode sheets and each of the diaphragms in a one-to-one correspondence to form at least two electrode assemblies.

[0043] It should be noted that the winding device 100 refers to a structure capable of winding electrode sheets and separators to form an electrode assembly. The electrode sheet to be cut refers to the initial electrode sheet roll, which is relatively wide and needs to be cut according to the dimensions of the electrode assembly to meet the width requirements. The separator to be cut refers to the initial separator roll, which is relatively wide and needs to be cut according to the dimensions of the electrode assembly to meet the width requirements.

[0044] Furthermore, the electrode sheets to be cut may include positive and negative electrode sheets. When winding to form an electrode assembly, the positive electrode sheet, the separator, and the negative electrode sheet are usually wound sequentially. That is, the separator needs to be placed between the positive and negative electrode sheets to isolate them.

[0045] The first slitting mechanism 10 can slit the electrode sheet to be slit along the length direction of the electrode sheet to be slit, so as to form at least two electrode sheets. The second slitting mechanism 20 can slit the diaphragm to be slit along the length direction of the diaphragm to be slit, so as to form at least two diaphragms.

[0046] The slitting process can be carried out using either metal cutting dies or laser cutting. When the slitting location is on the coated area of ​​the electrode, such as when slitting the positive electrode, one side needs to be slitted from the coated area. In this case, only metal cutting dies can be used. However, when the slitting location is on the tab area, i.e., on the uncoated area, either metal cutting dies or laser cutting can be used.

[0047] For ease of explanation, taking the cutting to form two electrodes and two separators as an example, one electrode may include a positive electrode and a negative electrode, and the positive electrode and the negative electrode are stacked with one of the separators. The positive electrode and the negative electrode in the other electrode are stacked with the other separator. Then, the two sets of positive electrodes, negative electrodes and separators enter the winding mechanism 30 respectively and are wound synchronously to form two electrode assemblies.

[0048] Understandably, in some other embodiments, the electrode sheet to be cut can be cut into three or more electrode sheets, and the diaphragm to be cut can be cut into three or more diaphragms. In this way, three or more electrode assemblies can be wound simultaneously, thereby effectively improving the winding efficiency of the electrode assembly.

[0049] Furthermore, in actual production, the widths of the separator, negative electrode, and positive electrode decrease sequentially, with the separator having the largest width to better isolate the positive and negative electrodes. However, there can be some deviation in the width of separators from different batches. This can easily lead to misalignment when the separator is used in the structure of electrode assemblies from different batches, resulting in a decrease in the yield of the electrode assemblies.

[0050] Therefore, in this application, the second slitting mechanism 20 can slit the diaphragm to be cut according to a preset width, so that the width of the diaphragm after slitting meets the production requirements, and the alignment between the diaphragm and the positive and negative electrode sheets is higher during the winding process, thereby improving the yield of the electrode assembly.

[0051] With the above structure, the first slitting mechanism 10 can slit the electrode sheet to be cut into at least two electrode sheets, and the second slitting mechanism 20 can slit the separator to be cut into at least two separators. Thus, each electrode sheet and each separator can be stacked in a one-to-one correspondence. After being wound by the winding mechanism 30, at least two electrode assemblies can be formed simultaneously, which effectively improves the winding efficiency of the electrode assembly and thus improves the overall production efficiency of the battery.

[0052] In some embodiments, the electrode sheet to be cut includes a first electrode sheet to be cut and a second electrode sheet to be cut. The first slitting mechanism 10 includes a first slitting component 11 and a second slitting component 12. The first slitting component 11 is used to slit the first electrode sheet to be cut into at least two first electrode sheets along the length direction, and the second slitting component 12 is used to slit the second electrode sheet to be cut into at least two second electrode sheets along the length direction. One of the first electrode sheet and the second electrode sheet is a positive electrode sheet, and the other is a negative electrode sheet.

[0053] Specifically, the first slitting component 11 and the second slitting component 12 can be configured to have the same structure. The first slitting component 11 is used to slit the first electrode sheet to be cut into at least two first electrodes along the length direction of the first electrode sheet to be cut, and the second slitting component 12 is used to slit the second electrode sheet to be cut into at least two second electrodes along the length direction of the second electrode sheet to be cut.

[0054] In this configuration, when the first electrode is the positive electrode, the second electrode is the negative electrode. Conversely, when the first electrode is the negative electrode, the second electrode is the positive electrode.

[0055] Furthermore, both the first slitting component 11 and the second slitting component 12 may include a first cutter, which cuts the first electrode sheet and the second electrode sheet to be cut along the length direction to form at least two first electrode sheets or at least two second electrode sheets.

[0056] In addition, the first slitting assembly 11 and the second slitting assembly 12 may also include a detection element and a control element that are connected to each other. The detection element can detect the actual width of the first electrode sheet and the second electrode sheet to be cut, and the control element can control the specific position of the first cutter according to the preset width, so that the width of each first electrode sheet and each second electrode sheet after slitting meets the preset width.

[0057] With the above structure, the first and second electrode sheets to be cut can be cut separately to form each first electrode sheet and each second electrode sheet. The first electrode sheets, each second electrode sheet and the separator are then stacked and wound together to form multiple electrode assemblies, thereby improving production efficiency.

[0058] In some embodiments, the diaphragm to be cut includes a first diaphragm to be cut and a second diaphragm to be cut. The second slitting mechanism 20 includes a third slitting component 21 and a fourth slitting component 22. The third slitting component 21 is used to slit the first diaphragm to be cut into at least two first diaphragms along the length direction, and the fourth slitting component 22 is used to slit the second diaphragm to be cut into at least two second diaphragms along the length direction. Each first electrode, each first diaphragm, each second electrode, and each second diaphragm are sequentially wound to form at least two electrode assemblies.

[0059] Specifically, the third slitting component 21 and the fourth slitting component 22 can be configured to have the same structure. The third slitting component 21 is used to slit the first slitting membrane into at least two first slitting membranes along the length direction of the first slitting membrane, and the fourth slitting component 22 is used to slit the second slitting membrane into at least two second slitting membranes along the length direction of the second slitting membrane.

[0060] Each of the first electrode, the first diaphragm, the second electrode, and the second diaphragm is arranged sequentially to facilitate winding into an electrode assembly.

[0061] Furthermore, both the third slitting component 21 and the fourth slitting component 22 may include a second cutter, which cuts the first septum to be cut and the second septum to be cut along the length direction to form at least two first septums or at least two second septums.

[0062] In addition, the third slitting assembly 21 and the fourth slitting assembly 22 may also include a detection element and a control element that are connected to each other. The detection element can detect the actual width of the first slit and the second slit to be cut, and the control element can control the specific position of the second cutter according to the preset width, so that the width of each first slit and each second slit after slitting meets the preset width.

[0063] With the above structure, the first diaphragm to be cut and the second diaphragm to be cut can be cut separately to form each first diaphragm and each second diaphragm, and the first electrode, the first diaphragm, the second electrode and the second diaphragm can be wound in sequence to form multiple electrode assemblies, thereby improving production efficiency.

[0064] In some embodiments, the winding device 100 further includes a separation mechanism 40, which is disposed between the first slitting mechanism 10 and the winding mechanism 30, and / or the second slitting mechanism 20 and the winding mechanism 30 along the material feeding direction. The separation mechanism 40 is used to separate each first electrode, each second electrode, each first diaphragm and each second diaphragm along the width direction.

[0065] The separation mechanism 40 refers to a structure capable of separating each of the first electrode sheets, second electrode sheets, first diaphragms, and second diaphragms after slitting. Specifically, when the first slitting assembly 11 slits the first electrode sheet to be cut into two first electrode sheets, the separation mechanism 40 is located between the first slitting assembly 11 and the winding mechanism 30, and can separate the two first electrode sheets along the width direction, so that the two first electrode sheets are separated by a certain distance, which facilitates subsequent winding.

[0066] When the second slitting component 12 slits the second electrode sheet into two second electrode sheets, the separation mechanism 40 is located between the second slitting component 12 and the winding mechanism 30. It can separate the two second electrode sheets along the width direction, so that the two second electrode sheets are separated by a certain distance, which is convenient for subsequent winding.

[0067] When the third slitting component 21 slits the first diaphragm into two first diaphragms, the separation mechanism 40 is located between the third slitting component 21 and the winding mechanism 30. It can separate the two first diaphragms along the width direction, so that the two first diaphragms are separated by a certain distance, which facilitates subsequent winding.

[0068] When the fourth slitting component 22 cuts the second diaphragm into two second diaphragms, the separation mechanism 40 is located between the fourth slitting component 22 and the winding mechanism 30. It can separate the two second diaphragms along the width direction, so that the two second diaphragms are separated by a certain distance, which facilitates subsequent winding.

[0069] Furthermore, the separated first electrode, first diaphragm, second electrode, and second diaphragm are stacked one-to-one and then simultaneously wound by the winding mechanism 30 to form multiple electrode assemblies.

[0070] By setting the separation mechanism 40, each of the first electrode, second electrode, first diaphragm, and second diaphragm after slitting is separated to facilitate subsequent winding operations and improve operational efficiency.

[0071] In some embodiments, the separation mechanism 40 includes multiple sets of separation roller groups, each set of separation roller groups including at least two separation rollers 41, the rotation axes of the separation rollers 41 in each set being angularly arranged, and / or, each separation roller 41 in each set being configured as a tapered roller. Each separation roller 41 is used to support and separate each first electrode, each second electrode, each first diaphragm, and each second diaphragm.

[0072] Specifically, each set of separating rollers may include two separating rollers 41, which are capable of rotating about their respective axes, i.e., the axes of each separating roller 41 form a rotation axis.

[0073] Furthermore, the rotation axes of the two separating rollers 41 are set at an angle, and each separating roller 41 is used to support one of the first electrode sheets, the second electrode sheet, the first diaphragm, or the second diaphragm. Taking the first electrode sheet as an example, after the two first electrode sheets are cut, they move along the intersecting direction under the drive of their respective separating rollers 41, thereby gradually increasing the distance between the two first electrode sheets in the width direction, so as to facilitate the winding of the two first electrode sheets respectively.

[0074] In addition, the two separating rollers 41 can also be set as tapered rollers. Since the roller surface of the tapered roller has a certain angle, the distance between the two first pole pieces along the width direction gradually increases with the tapered roller during the winding process, so that the two first pole pieces can be wound separately.

[0075] By setting the separation roller 41, while supporting each first electrode sheet, each second electrode sheet, each first diaphragm and each second diaphragm, it can drive the slit first electrode sheet, each second electrode sheet, each first diaphragm and each second diaphragm to separate, so as to facilitate the subsequent winding operation.

[0076] In some embodiments, the winding device 100 further includes an unwinding mechanism 50, which is disposed upstream of the first slitting mechanism 10 and the second slitting mechanism 20 along the feeding direction, for unwinding the electrode sheet to be cut and the diaphragm to be cut.

[0077] Specifically, the material feeding direction refers to the conveying direction of the electrode and the diaphragm, that is, the length direction of the electrode and the diaphragm.

[0078] The unwinding mechanism 50 may include an unwinding roller that is rotatably arranged about the axial direction, which winds the electrode sheet and the diaphragm to be cut onto the unwinding roller, and unwinds the electrode sheet and the diaphragm to be cut by rotating the unwinding roller.

[0079] By setting the unwinding mechanism 50, the electrode sheets and diaphragms to be cut can be unwound, so as to facilitate their slitting.

[0080] In some embodiments, the winding device 100 includes a die-cutting mechanism (not shown in the figure), which is disposed upstream of the first slitting mechanism 10 along the feeding direction and is used to die-cut tabs on the electrode sheet.

[0081] The electrode assembly includes a full-tab structure and a multi-tab structure. The full-tab structure does not require die-cutting of the tabs, while the multi-tab structure requires die-cutting of the tabs to form multiple spaced sub-tabs.

[0082] Therefore, the winding device 100 is also provided with a die-cutting mechanism, which is located upstream of the first slitting component 11 and the second slitting component 12. First, the die-cutting mechanism is used to die-cut the tab areas of the first electrode sheet to be cut and the second electrode sheet to be cut, so as to form multiple spaced sub-tabs. Then, the first electrode sheet to be cut and the second electrode sheet to be cut are cut into at least two first electrode sheets or at least two second electrode sheets respectively through the first slitting component 11 and the second slitting component 12.

[0083] By setting up a die-cutting mechanism, the tab area of ​​the electrode sheet can be die-cut to form a tab, so as to facilitate the formation of the electrode assembly.

[0084] In some embodiments, the winding device 100 further includes a correction mechanism 60, which is disposed downstream of the first slitting mechanism 10 along the feeding direction and is used to drive each electrode sheet to move along its width direction.

[0085] Specifically, the correction mechanism 60 may include a clamping member, which clamps each first electrode and each second electrode respectively, and then drives each clamped first electrode and each second electrode to move along the width direction to adjust the position of the first electrode and the second electrode.

[0086] By setting the correction mechanism 60, the positions of the first electrode and the second electrode can be further adjusted, so that the first electrode, the first separator, the second electrode and the second separator can maintain a high alignment accuracy, which helps to improve the quality of the battery cell.

[0087] In some embodiments, the winding device 100 further includes a tension mechanism 70, which is used to adjust the tension of each electrode and each diaphragm.

[0088] Specifically, the tension mechanism 70 can adjust the tension of each first electrode, each second electrode, each first diaphragm, and each second diaphragm, thereby ensuring that each first electrode, each second electrode, each first diaphragm, and each second diaphragm can be transported normally.

[0089] Based on the same concept as the winding device 100 described above, this application also provides a battery production apparatus, including the winding device 100 as described above, which is used to wind stacked electrode sheets and separators to form an electrode assembly.

[0090] According to one or more embodiments, the first electrode sheet to be cut, the second electrode sheet to be cut, the first diaphragm to be cut, and the second diaphragm to be cut are first unwound by the unwinding mechanism 50, so that they move along the feeding direction.

[0091] The first and second electrode sheets to be cut first pass through a die-cutting mechanism to form multiple interspaced sub-electrodes in the electrode tab area. Then, the first electrode sheet to be cut is cut by the first slitting assembly 11 to form two first electrode sheets, the second electrode sheet to be cut is cut by the second slitting assembly 12 to form two second electrode sheets, the first diaphragm to be cut is cut by the third slitting assembly 21 to form two first diaphragms, and the second diaphragm to be cut is cut by the fourth slitting assembly 22 to form two second diaphragms.

[0092] Each first electrode, each first diaphragm, each second electrode, and each second diaphragm are stacked in sequence and wound by the winding mechanism 30 to form two electrode assemblies.

[0093] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0094] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A winding device, comprising: The first slitting mechanism is used to slit the electrode sheet to be cut into at least two electrode sheets along the length direction of the electrode sheet to be cut; The second slitting mechanism is used to slit the diaphragm to be cut into at least two diaphragms along the length of the diaphragm to be cut. and A winding mechanism is used to wind each of the slit electrode sheets and each of the diaphragms in a one-to-one correspondence to form at least two electrode assemblies.

2. The winding device according to claim 1, wherein, The electrode sheet to be cut includes a first electrode sheet to be cut and a second electrode sheet to be cut. The first cutting mechanism includes a first cutting component and a second cutting component. The first cutting component is used to cut the first electrode sheet to be cut into at least two first electrode sheets along the length direction. The second cutting component is used to cut the second electrode sheet to be cut into at least two second electrode sheets along the length direction. In this configuration, one of the first electrode and the second electrode is a positive electrode, and the other is a negative electrode.

3. The winding device according to claim 2, wherein, The diaphragm to be cut includes a first diaphragm to be cut and a second diaphragm to be cut. The second cutting mechanism includes a third cutting component and a fourth cutting component. The third cutting component is used to cut the first diaphragm to be cut into at least two first diaphragms along the length direction. The fourth cutting component is used to cut the second diaphragm to be cut into at least two second diaphragms along the length direction. Each of the first electrode, each of the first diaphragm, each of the second electrode and each of the second diaphragm are sequentially wound to form at least two electrode assemblies.

4. The winding device according to claim 3, wherein, The winding device further includes a separation mechanism, which is disposed between the first slitting mechanism and the winding mechanism, and / or the second slitting mechanism and the winding mechanism along the material feeding direction. The separation mechanism is used to separate each of the first electrode sheets, each of the second electrode sheets, each of the first diaphragms and each of the second diaphragms along the width direction.

5. The winding apparatus according to claim 4, wherein, The separation mechanism includes multiple sets of separation roller groups, each set of separation roller groups includes at least two separation rollers, the rotation axes of each separation roller in each set are set at an angle, and / or, each separation roller in each set is constructed as a tapered roller; Each of the separating rollers is used to support and separate each of the first electrode, each of the second electrode, each of the first diaphragm and each of the second diaphragm.

6. The winding apparatus according to any one of claims 1-5, wherein, The winding device further includes an unwinding mechanism, which is located upstream of the first slitting mechanism and the second slitting mechanism along the material feeding direction, and is used to unwind the electrode sheet to be cut and the diaphragm to be cut.

7. The winding apparatus according to any one of claims 1-6, wherein, The winding device includes a die-cutting mechanism, which is located upstream of the first slitting mechanism along the material feeding direction and is used to die-cut tabs on the electrode sheet.

8. The winding apparatus according to any one of claims 1-7, wherein, The winding device further includes a correction mechanism, which is located downstream of the first slitting mechanism along the material feeding direction and is used to drive each electrode sheet to move along its width direction.

9. The winding apparatus according to any one of claims 1-8, wherein, The winding device further includes a tension mechanism for adjusting the tension of each of the electrodes and each of the diaphragms.

10. A battery manufacturing apparatus, comprising a winding device as described in any one of claims 1-9, the winding device being used to wind stacked electrodes and separators to form an electrode assembly.

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