Winding device and battery production equipment

Abstract

The utility model relates to a winding device and battery production equipment, and the winding device comprises a first slitting mechanism which is used for slitting a to-be-cut pole piece into at least two pole pieces in the length direction of the to-be-cut pole piece; the second slitting mechanism is used for slitting the to-be-cut diaphragm into at least two diaphragms in the length direction of the to-be-cut diaphragm; and the winding mechanism is used for winding the slit pole pieces and the diaphragms in a one-to-one correspondence manner to form at least two electrode assemblies. The first slitting mechanism can slit the to-be-cut pole piece into at least two pole pieces, and the second slitting mechanism can slit the to-be-cut diaphragm into at least two diaphragms, so that the pole pieces and the diaphragms can be stacked in a one-to-one correspondence manner, and then the pole pieces and the diaphragms can be wound at the same time to form at least two electrode assemblies after being wound by the winding mechanism; and the winding efficiency of the electrode assembly is effectively improved, so that the overall production efficiency of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a winding device and battery production equipment. Background Art

[0002] According to different manufacturing processes, battery cells can be divided into wound battery cells and stacked battery cells. Among them, the wound battery cells require the positive electrode sheet, the separator and the negative electrode sheet to be wound to form an electrode assembly with a core structure.

[0003] However, the current efficiency of the electrode assembly winding process is low, which affects the overall production efficiency of the battery. Utility Model Content

[0004] Based on this, it is necessary to provide a winding device and battery production equipment to address the problem that the current electrode assembly winding process is inefficient and affects the overall production efficiency of the battery.

[0005] In the first aspect, the present 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 thereof, the second slitting mechanism is used to slit the diaphragm to be cut into at least two diaphragms along the length direction thereof, and the winding mechanism is used to wind the slit electrode sheets and diaphragms one by one to form at least two electrode assemblies.

[0006] Through the above structure, the first cutting mechanism can cut the electrode sheet to be cut into at least two electrode sheets, and the second cutting mechanism can cut the diaphragm to be cut into at least two diaphragms. Thus, each electrode sheet and each diaphragm can be stacked one by one, and then after being wound by the winding mechanism, at least two electrode assemblies can be wound simultaneously, effectively improving the winding efficiency of the electrode assembly, thereby improving the overall production efficiency of the battery.

[0007] In some embodiments, the electrode to be cut includes a first electrode to be cut and a second electrode to be cut, and 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 to be cut into at least two first electrode pieces along the length direction of the first electrode piece, and the second cutting component is used to cut the second electrode piece to be cut into at least two second electrode pieces along the length direction of the second electrode piece; wherein, one of the first electrode piece and the second electrode piece is a positive electrode piece, and the other is a negative electrode piece.

[0008] Through the above structure, the first electrode piece to be cut and the second electrode piece to be cut can be cut separately to form each first electrode piece and each second electrode piece, and each first electrode piece, each second electrode piece and the diaphragm are stacked and wound to form multiple electrode assemblies, thereby improving production efficiency.

[0009] In some embodiments, 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, and 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 first electrode sheet, each first diaphragm, each second electrode sheet and each second diaphragm are wound in sequence to form at least two electrode assemblies.

[0010] Through 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 pole piece, the first diaphragm, the second pole piece and the second diaphragm are stacked and wound in sequence to form multiple electrode assemblies, thereby improving production efficiency.

[0011] In some embodiments, the winding device also includes a separation mechanism, which is arranged between the first slitting mechanism and the winding mechanism, and / or the second slitting mechanism and the winding mechanism along the feeding direction, and the separation mechanism is used to separate the first pole pieces, the second pole pieces, the first diaphragms and the second diaphragms along the width direction.

[0012] By setting up a separation mechanism, each first pole piece, each second pole piece, each first diaphragm and each second diaphragm after cutting are separated respectively, so as to facilitate the subsequent winding operation and improve the operation efficiency.

[0013] In some embodiments, the separation mechanism includes multiple groups of separation roller groups, each group of separation roller groups includes at least two separation rollers, the rotation axes of each separation roller in each group are set at an angle, and / or each separation roller in each group is constructed as a tapered roller; wherein each separation roller is used to support and separate each first pole piece, each second pole piece, each first diaphragm and each second diaphragm.

[0014] By setting up a separation roller, on the basis of supporting each first pole piece, each second pole piece, each first diaphragm and each second diaphragm, it is possible to drive each first pole piece, each second pole piece, each first diaphragm and each second diaphragm to be separated after cutting, so as to facilitate the subsequent winding operation.

[0015] In some embodiments, the winding device further includes an unwinding mechanism, which is disposed upstream of the first slitting mechanism and the second slitting mechanism along the material feeding direction and is used for unwinding the electrode sheets and the diaphragms to be cut.

[0016] By providing an unwinding mechanism, the pole pieces to be cut and the diaphragms to be cut can be unwound to facilitate cutting.

[0017] In some embodiments, the winding device includes a die-cutting mechanism, which is arranged upstream of the first slitting mechanism along the feeding direction and is used to die-cut the pole piece to form a pole ear.

[0018] By providing a die-cutting mechanism, the pole ear area of ​​the pole piece can be die-cut to form the pole ear, so as to smoothly form the electrode assembly.

[0019] In some embodiments, the winding device further includes a deviation correction mechanism, which is disposed downstream of the first slitting mechanism along the material feeding direction and is used to drive each pole piece to move along its width direction.

[0020] By setting up a correction mechanism, the positions of the first pole piece and the second pole piece can be further adjusted, so that the first pole piece, the first diaphragm, the second pole piece and the second diaphragm can maintain a high alignment accuracy, which helps to improve the quality of the battery cell.

[0021] In some embodiments, the winding device further includes a tension mechanism, and the tension mechanism is used to adjust the tension of each pole piece and each diaphragm.

[0022] Therefore, the tension mechanism can adjust the tension of each first pole piece, each second pole piece, each first diaphragm and each second diaphragm, so as to ensure that each first pole piece, each second pole piece, each first diaphragm and each second diaphragm can be transported normally.

[0023] In a second aspect, the present application also provides a battery production device, comprising a winding device as described above, the winding device being used to wind stacked pole sheets and separators to form an electrode assembly.

[0024] The above-mentioned winding device and battery production equipment, the first cutting mechanism can cut the electrode sheet to be cut into at least two electrode sheets, and the second cutting mechanism can cut the diaphragm to be cut into at least two diaphragms, thereby, each electrode sheet and each diaphragm can be stacked one by one, and then after being wound by the winding mechanism, at least two electrode assemblies can be wound simultaneously, which effectively improves the winding efficiency of the electrode assembly, thereby improving the overall production efficiency of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of a winding device according to one or more embodiments.

[0026] Figure 2 It is a schematic structural diagram of a separation mechanism in a winding device according to one or more embodiments.

[0027] Explanation of the accompanying drawings: 100, winding device; 10, first slitting mechanism; 20, second slitting mechanism; 30, winding mechanism; 40, separation 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, separation roller. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0030] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, 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 implementation method.

[0034] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0035] A battery cell is the smallest unit that makes up a battery, and the structure of a battery cell usually includes a shell and an electrode assembly placed in the shell. Among them, the electrode assembly is the component in the battery cell where the electrochemical reaction actually occurs. The electrode assembly is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. When the positive electrode sheet, the separator and the negative electrode sheet are stacked in sequence, a laminated electrode assembly can be formed, and the laminated electrode assembly can be placed in the shell to form a laminated battery cell. After the stacked positive electrode sheet, the separator and the negative electrode sheet are wound, a wound electrode assembly can be formed, and the wound electrode assembly can be placed in the shell to form a wound battery cell.

[0036] At present, when a winding device is used to wind the electrode sheet and the separator to form an electrode assembly, the winding of one electrode assembly can usually be completed at a time. This results in a low production capacity of the winding device and a low winding efficiency of the electrode assembly, which ultimately affects the overall production efficiency of the battery.

[0037] Based on the above considerations, in order to solve the problem that the current electrode assembly winding process is inefficient and affects the overall production efficiency of the battery, a winding device is provided in one or more embodiments of the present application, wherein a first slitting mechanism can slit the electrode sheet to be cut into at least two electrode sheets, and a second slitting mechanism can slit the diaphragm to be cut into at least two diaphragms, thereby, each electrode sheet and each diaphragm can be stacked one by one, and then after being wound by the winding mechanism, at least two electrode assemblies can be wound simultaneously, thereby effectively improving the winding efficiency of the electrode assembly, thereby improving the overall production efficiency of the battery.

[0038] See also Figure 1 An embodiment of the present 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 thereof, the second slitting mechanism 20 is used to slit the diaphragm to be cut into at least two diaphragms along the length direction thereof, and the winding mechanism 30 is used to wind the slit electrode sheets and diaphragms in a one-to-one correspondence to form at least two electrode assemblies.

[0039] It should be noted that the winding device 100 refers to a structure capable of winding the electrode sheet and the diaphragm to form an electrode assembly. The electrode sheet to be cut refers to the initial electrode sheet roll, which is relatively wide. It is necessary to cut the electrode sheet to meet the width size of the electrode assembly according to the size of the electrode assembly. The diaphragm to be cut refers to the initial diaphragm roll, which is relatively wide. It is necessary to cut the diaphragm to meet the width size of the electrode assembly according to the size of the electrode assembly.

[0040] Furthermore, the electrode sheets to be cut may include positive electrode sheets 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 in sequence. That is, the separator needs to be arranged between the positive electrode sheet and the negative electrode sheet to isolate the positive electrode sheet from the negative electrode sheet.

[0041] The first cutting mechanism 10 can cut the electrode piece to be cut along the length direction of the electrode piece to be cut, so as to form at least two electrode pieces. The second cutting mechanism 20 can cut the diaphragm to be cut along the length direction of the diaphragm to be cut, so as to form at least two diaphragms.

[0042] The slitting process can be performed by metal die cutting or laser cutting. When the slitting position is located in the coating area on the electrode, for example, when the positive electrode is slitting, one side needs to be slid in the coating area. At this time, only metal die cutting can be used. When the slitting position is located in the lug area, that is, when the slitting position is located in the uncoated area, metal die cutting or laser cutting can be used.

[0043] For ease of explanation, taking the example of cutting to form two electrode sheets and two separators, one of the electrode sheets may include a positive electrode sheet and a negative electrode sheet, and the positive electrode sheet, the negative electrode sheet and one of the separators are stacked, and the positive electrode sheet and the negative electrode sheet in the other electrode sheet are stacked with another separator, and then the two groups of positive electrode sheets, negative electrode sheets and separators respectively enter the winding mechanism 30 and are wound synchronously to form two electrode assemblies.

[0044] It can be understood that in some other embodiments, the pole piece to be cut can be cut into three or more pole pieces, 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 synchronously, thereby effectively improving the winding efficiency of the electrode assembly.

[0045] In addition, in the actual production process, the widths of the separator, negative electrode sheet, and positive electrode sheet decrease in sequence, that is, the separator has the largest width to better isolate the positive and negative electrode sheets. However, there will be a certain deviation between the widths of different batches of separators, which will easily lead to a certain deviation in alignment when the separator is used in the structure of different batches of electrode assemblies, resulting in a decrease in the quality rate of the electrode assembly.

[0046] Therefore, in the present 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 degree between the diaphragm and the positive and negative electrode sheets during the winding process is higher, thereby improving the quality rate of the electrode assembly.

[0047] Through the above structure, the first cutting mechanism 10 can cut the electrode sheet to be cut into at least two electrode sheets, and the second cutting mechanism 20 can cut the diaphragm to be cut into at least two diaphragms. Thus, each electrode sheet and each diaphragm can be stacked one by one, and then after being wound by the winding mechanism 30, at least two electrode assemblies can be wound simultaneously, which effectively improves the winding efficiency of the electrode assembly, thereby improving the overall production efficiency of the battery.

[0048] In some embodiments, the electrode to be cut includes a first electrode to be cut and a second electrode to be cut, and the first cutting mechanism 10 includes a first cutting component 11 and a second cutting component 12. The first cutting component 11 is used to cut the first electrode to be cut into at least two first electrode pieces along the length direction, and the second cutting component 12 is used to cut the second electrode to be cut into at least two second electrode pieces along the length direction. Among them, one of the first electrode piece and the second electrode piece is a positive electrode piece, and the other is a negative electrode piece.

[0049] Specifically, the structures of the first cutting component 11 and the second cutting component 12 can be set to be the same, the first cutting component 11 is used to cut the first pole piece to be cut into at least two first pole pieces along the length direction of the first pole piece to be cut, and the second cutting component 12 is used to cut the second pole piece to be cut into at least two second pole pieces along the length direction of the second pole piece to be cut.

[0050] When the first electrode is a positive electrode, the second electrode is a negative electrode. Conversely, when the first electrode is a negative electrode, the second electrode is a positive electrode.

[0051] Furthermore, the first cutting assembly 11 and the second cutting assembly 12 may both include a first cutter, and the first cutter is used to cut the first electrode piece to be cut and the second electrode piece to be cut along the length direction to form at least two first electrode pieces or at least two second electrode pieces.

[0052] In addition, the first cutting component 11 and the second cutting component 12 can also include a detection component and a control component that are communicatively connected to each other. The detection component can detect the actual width of the first electrode piece to be cut and the second electrode piece to be cut, and the control component can control the specific position of the first cutter according to the preset width, so that the width of each first electrode piece and each second electrode piece after cutting meets the preset width.

[0053] Through the above structure, the first electrode piece to be cut and the second electrode piece to be cut can be cut separately to form each first electrode piece and each second electrode piece, and each first electrode piece, each second electrode piece and the diaphragm are stacked and wound to form multiple electrode assemblies, thereby improving production efficiency.

[0054] In some embodiments, the separator to be cut includes a first separator to be cut and a second separator to be cut, and the second cutting mechanism 20 includes a third cutting assembly 21 and a fourth cutting assembly 22. The third cutting assembly 21 is used to cut the first separator to be cut into at least two first separators along the length direction, and the fourth cutting assembly 22 is used to cut the second separator to be cut into at least two second separators along the length direction. Each first electrode piece, each first separator, each second electrode piece and each second separator are wound in sequence to form at least two electrode assemblies.

[0055] Specifically, the structures of the third cutting component 21 and the fourth cutting component 22 can be set to be the same, the third cutting component 21 is used to cut the first diaphragm to be cut into at least two first diaphragms along the length direction of the first diaphragm to be cut, and the fourth cutting component 22 is used to cut the second diaphragm to be cut into at least two second diaphragms along the length direction of the second diaphragm to be cut.

[0056] Wherein, each of the first pole piece, the first diaphragm, the second pole piece and the second diaphragm are arranged in sequence so as to be wound to form an electrode assembly.

[0057] Furthermore, the third slitting assembly 21 and the fourth slitting assembly 22 may both include a second cutter, and the first diaphragm to be cut and the second diaphragm to be cut are respectively slid along the length direction by the second cutter to form at least two first diaphragms or at least two second diaphragms.

[0058] In addition, the third cutting component 21 and the fourth cutting component 22 can also include a detection component and a control component that are communicatively connected to each other. The detection component can detect the actual width of the first diaphragm to be cut and the second diaphragm to be cut, and the control component can control the specific position of the second cutter according to the preset width, so that the width of each first diaphragm and each second diaphragm after cutting meets the preset width.

[0059] Through 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 pole piece, the first diaphragm, the second pole piece and the second diaphragm are wound in sequence to form multiple electrode assemblies, thereby improving production efficiency.

[0060] In some embodiments, the winding device 100 also includes a separation mechanism 40, which is arranged 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 feeding direction, and the separation mechanism 40 is used to separate each first pole piece, each second pole piece, each first diaphragm and each second diaphragm along the width direction.

[0061] The separation mechanism 40 refers to a structure capable of separating the first pole pieces, the second pole pieces, the first diaphragms and the second diaphragms after cutting. Specifically, when the first cutting assembly 11 cuts the first pole piece to be cut into two first pole pieces, the separation mechanism 40 is located between the first cutting assembly 11 and the winding mechanism 30, and can separate the two first pole pieces along the width direction, so that a certain distance is pulled between the two first pole pieces, which is convenient for subsequent winding.

[0062] When the second cutting component 12 cuts the second pole piece to be cut into two second pole pieces, the separation mechanism 40 is located between the second cutting component 12 and the winding mechanism 30, and can separate the two second pole pieces along the width direction so that a certain distance is pulled between the two second pole pieces to facilitate subsequent winding.

[0063] When the third slitting component 21 slits the first diaphragm to be cut into two first diaphragms, the separation mechanism 40 is located between the third slitting component 21 and the winding mechanism 30, and can separate the two first diaphragms along the width direction so that a certain distance is pulled between the two first diaphragms to facilitate subsequent winding.

[0064] When the fourth slitting component 22 slits the second diaphragm to be cut into two second diaphragms, the separation mechanism 40 is located between the fourth slitting component 22 and the winding mechanism 30, and can separate the two second diaphragms along the width direction so that a certain distance is pulled between the two second diaphragms to facilitate subsequent winding.

[0065] Furthermore, the separated first pole piece, the first diaphragm, the second pole piece and the second diaphragm are stacked one by one, and then synchronously wound by the winding mechanism 30 to form a plurality of electrode assemblies.

[0066] By providing the separation mechanism 40 , each first pole piece, each second pole piece, each first diaphragm and each second diaphragm after cutting are separated respectively, so as to facilitate the subsequent winding operation and improve the operation efficiency.

[0067] In some embodiments, the separation mechanism 40 includes multiple sets of separation rollers, each set of separation rollers includes at least two separation rollers 41, and the rotation axes of the separation rollers 41 in each set are arranged at an angle, and / or the separation rollers 41 in each set are configured as tapered rollers. Each separation roller 41 is used to support and separate each first pole piece, each second pole piece, each first diaphragm, and each second diaphragm.

[0068] Specifically, each separation roller group may include two separation rollers 41 , and the two separation rollers 41 can rotate around their respective axes, that is, the axis of each separation roller 41 forms a rotation axis.

[0069] Furthermore, the rotation axes of the two separation rollers 41 are arranged at an angle, and each separation roller 41 is used to support one of the first pole pieces or the second pole pieces or the first diaphragm or the second diaphragm. Taking the first pole piece as an example, after the two first pole pieces are cut, they are driven by their respective separation rollers 41 to move in intersecting directions, so that the distance between the two first pole pieces in the width direction gradually increases, so as to facilitate winding the two first pole pieces respectively.

[0070] In addition, the two separation 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.

[0071] By setting up the separation roller 41, on the basis of supporting each first pole piece, each second pole piece, each first diaphragm and each second diaphragm, it is possible to drive each first pole piece, each second pole piece, each first diaphragm and each second diaphragm to be separated after cutting, so as to facilitate the subsequent winding operation.

[0072] 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 material feeding direction and is used for unwinding the electrode sheets and the diaphragms to be cut.

[0073] Specifically, the material feeding direction refers to the conveying direction of the electrode pieces and the diaphragms, that is, the length direction of the electrode pieces and the diaphragms.

[0074] The unwinding mechanism 50 may include an unwinding roller rotatably arranged around the axial direction, the pole piece to be cut and the diaphragm to be cut are wound on the unwinding roller, and the unwinding of the pole piece to be cut and the diaphragm to be cut is achieved through the rotation of the unwinding roller.

[0075] By providing the unwinding mechanism 50 , the electrode sheets and the diaphragms to be cut can be unwound, so as to facilitate their slitting.

[0076] In some embodiments, the winding device 100 includes a die-cutting mechanism (not shown in the figure), which is arranged upstream of the first slitting mechanism 10 along the feeding direction and is used to die-cut the pole piece to form the pole ear.

[0077] The electrode assembly includes a full-ear structure and a multi-ear structure. The full-ear structure does not require die-cutting of the ear, while the multi-ear structure requires die-cutting of the ear to form a plurality of spaced-apart sub-ears.

[0078] Therefore, a die-cutting mechanism is also provided in the winding device 100, and the die-cutting mechanism is arranged upstream of the first cutting component 11 and the second cutting component 12. The die-cutting mechanism is first used to die-cut the pole ear area of ​​the first pole piece to be cut and the second pole piece to be cut to form a plurality of spaced sub-pole ears, and then the first cutting component 11 and the second cutting component 12 are used to cut the first pole piece to be cut and the second pole piece to be cut into at least two first pole pieces or at least two second pole pieces respectively.

[0079] By providing a die-cutting mechanism, the pole ear area of ​​the pole piece can be die-cut to form the pole ear, so as to smoothly form the electrode assembly.

[0080] In some embodiments, the winding device 100 further includes a deviation correction mechanism 60, which is disposed downstream of the first slitting mechanism 10 along the material feeding direction and is used to drive each pole piece to move along its width direction.

[0081] Specifically, the correction mechanism 60 may include a clamping member, which clamps each first pole piece and each second pole piece respectively, and then drives the clamped first pole pieces and each second pole piece to move along the width direction to adjust the positions of the first pole pieces and the second pole pieces.

[0082] By providing the deviation correction mechanism 60, the positions of the first pole piece and the second pole piece can be further adjusted, so that the first pole piece, the first diaphragm, the second pole piece and the second diaphragm can maintain a high alignment accuracy, which helps to improve the quality of the battery cell.

[0083] In some embodiments, the winding device 100 further includes a tension mechanism 70, and the tension mechanism 70 is used to adjust the tension of each pole piece and each diaphragm.

[0084] Specifically, the tension mechanism 70 can adjust the tension of each first pole piece, each second pole piece, each first diaphragm and each second diaphragm, so as to ensure that each first pole piece, each second pole piece, each first diaphragm and each second diaphragm can be transported normally.

[0085] Based on the same concept as the above-mentioned winding device 100, the present application also provides a battery production equipment, including the above-mentioned winding device 100, which is used to wind the stacked pole sheets and separators to form an electrode assembly.

[0086] According to one or more embodiments, the first electrode piece to be cut, the second electrode piece to be cut, the first diaphragm to be cut, and the second diaphragm to be cut are first unwound by the unwinding mechanism 50 respectively, so as to move them along the feeding direction.

[0087] The first electrode piece to be cut and the second electrode piece to be cut first pass through the die-cutting mechanism, and die-cut in the electrode ear area to form a plurality of sub-electrode ears spaced from each other. Then, the first electrode piece to be cut passes through the first cutting component 11 to form two first electrode pieces, the second electrode piece to be cut passes through the second cutting component 12 to form two second electrode pieces, the first diaphragm to be cut passes through the third cutting component 21 to form two first diaphragms, and the second diaphragm to be cut passes through the fourth cutting component 22 to form two second diaphragms.

[0088] The first pole pieces, the first separators, the second pole pieces and the second separators are stacked in sequence and are respectively wound by the winding mechanism 30 to form two electrode assemblies.

[0089] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0090] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A winding device, characterized in that: include: A first cutting mechanism, used for cutting the electrode piece to be cut into at least two electrode pieces along its length direction; A second slitting mechanism is used to slit the diaphragm to be cut into at least two diaphragms along its length direction; and The winding mechanism is used to wind the cut pole pieces and the separators in a one-to-one correspondence to form at least two electrode assemblies.

2. The winding device according to claim 1, characterized in that The electrode pieces to be cut include a first electrode piece to be cut and a second electrode piece 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 piece to be cut into at least two first electrode pieces along the length direction, and the second cutting component is used to cut the second electrode piece to be cut into at least two second electrode pieces along the length direction; Among them, one of the first pole piece and the second pole piece is a positive pole piece, and the other is a negative pole piece.

3. The winding device according to claim 2, characterized in that The diaphragm to be cut includes a first diaphragm to be cut and a second diaphragm to be cut, the second slitting mechanism includes a third slitting assembly and a fourth slitting assembly, the third slitting assembly is used to slitting the first diaphragm to be cut into at least two first diaphragms along the length direction of the first diaphragm to be cut, and the fourth slitting assembly is used to slitting the second diaphragm to be cut into at least two second diaphragms along the length direction of the second diaphragm to be cut; Each of the first pole sheets, each of the first diaphragms, each of the second pole sheets and each of the second diaphragms are wound in sequence to form at least two of the electrode assemblies.

4. The winding device according to claim 3, characterized in that: The winding device also includes a separation mechanism, which is arranged between the first slitting mechanism and the winding mechanism, and / or the second slitting mechanism and the winding mechanism along the feeding direction, and the separation mechanism is used to separate the first pole pieces, the second pole pieces, the first diaphragms and the second diaphragms along the width direction.

5. The winding device according to claim 4, characterized in that The separation mechanism comprises a plurality of separation roller groups, each of the separation roller groups comprises at least two separation rollers, the rotation axes of the separation rollers in each group are arranged at an angle, and / or the separation rollers in each group are configured as tapered rollers; Wherein, each of the separation rollers is used to support and separate each of the first pole pieces, each of the second pole pieces, each of the first diaphragms, and each of the second diaphragms.

6. The winding device according to claim 1, characterized in that: The winding device further comprises an unwinding mechanism, which is arranged upstream of the first slitting mechanism and the second slitting mechanism along the material feeding direction and is used for unwinding the electrode sheet to be cut and the diaphragm to be cut.

7. The winding device according to claim 1, characterized in that The winding device comprises a die-cutting mechanism, which is arranged upstream of the first slitting mechanism along the material feeding direction and is used for die-cutting the pole piece to form a pole ear.

8. The winding device according to claim 1, characterized in that The winding device further comprises a deviation-correcting mechanism, which is arranged downstream of the first slitting mechanism along the material feeding direction and is used to drive each of the pole pieces to move along the width direction thereof.

9. The winding device according to claim 1, characterized in that: The winding device further comprises a tension mechanism, and the tension mechanism is used to adjust the tension of each of the pole pieces and each of the diaphragms.

10. A battery production device, characterized in that: It comprises a winding device as described in any one of claims 1 to 9, wherein the winding device is used to wind stacked pole sheets and separators to form an electrode assembly.

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