Electrode assembly, battery monomer, power utilization device and manufacturing equipment of electrode assembly

Abstract

The utility model discloses an electrode assembly, a battery monomer, a power utilization device and manufacturing equipment of the electrode assembly. The electrode assembly comprises a first electrode plate, wherein the first electrode plate is repeatedly folded into a plurality of first sub-electrode plates which are connected in sequence; at least two diaphragms respectively cover the two sides of the first electrode plate; the polarity of the second electrode plates is opposite to that of the first electrode plates, and each second electrode plate is arranged between every two adjacent first sub-electrode plates. According to the electrode assembly, the battery monomer, the power utilization device and the manufacturing equipment of the electrode assembly disclosed by the invention, the manufacturing efficiency of the electrode assembly can be improved.

Description

Technical Field

[0001] This application relates to the technical field of battery cells, and particularly to an electrode assembly, a battery cell, an electrical device, and a manufacturing apparatus for the electrode assembly. Background Art

[0002] When manufacturing the electrode assembly of a battery, the separator is usually repeatedly folded, and the cut positive electrode sheet and negative electrode sheet are inserted between the folded separators to form the electrode assembly. During the manufacturing process, the positive electrode roll and the negative electrode roll need to be cut separately to form the positive electrode sheet and the negative electrode sheet. The number of cuts is relatively large, and the position correction needs to be performed each time the positive electrode sheet and the negative electrode sheet are inserted, making the manufacturing process of the electrode assembly very complicated and reducing the manufacturing efficiency of the electrode assembly. Summary of the Utility Model

[0003] Embodiments of this application provide an electrode assembly, a battery cell, an electrical device, and a manufacturing apparatus for the electrode assembly, which can improve the manufacturing efficiency of the electrode assembly.

[0004] In a first aspect, embodiments of this application provide an electrode assembly, including: a first electrode sheet, which is repeatedly folded multiple times to form a plurality of first sub-electrode sheets connected in sequence; a plurality of separators, at least two of which respectively cover both sides of the first electrode sheet; and a plurality of second electrode sheets, having a polarity opposite to that of the first electrode sheet, and the second electrode sheets are disposed between two adjacent first sub-electrode sheets.

[0005] In the embodiments of the first aspect of this application, along the width direction of the first electrode sheet, at least one end of the folding position of the first electrode sheet is provided with a first notch.

[0006] In the embodiments of the first aspect of this application, both ends of the second electrode sheet along its own length direction are provided with second notches, and the second notches are located at at least one end of the second electrode sheet along its own width direction.

[0007] In the embodiments of the first aspect of this application, along the thickness direction of the electrode assembly, the orthographic projection of the first sub-electrode sheet covers the orthographic projection of the second electrode sheet.

[0008] In the embodiments of the first aspect of this application, along the thickness direction of the electrode assembly, the orthographic projection of the first sub-electrode sheet is located within the orthographic projection of the separator; the separators located on both sides of the first electrode sheet are at least partially connected.

[0009] In the embodiments of the first aspect of this application, the electrode assembly further includes a first tab and a second tab; the number of the first tabs is multiple and they are respectively connected to the first sub-electrode sheets in one-to-one correspondence; the number of the second tabs is multiple and they are respectively connected to the second electrode sheets in one-to-one correspondence; along the thickness direction of the electrode assembly, the orthographic projections of the multiple first tabs overlap, the orthographic projections of the multiple second tabs overlap, and the orthographic projections of the multiple first tabs and the orthographic projections of the multiple second tabs are spaced apart.

[0010] In an embodiment of the first aspect of the present application, the distances from the first tabs corresponding to two adjacent first sub-electrode tabs to the connection of the two adjacent first sub-electrode tabs are equal.

[0011] In a second aspect, an embodiment of the present application provides a battery cell, including: a housing having an accommodation space; an electrode assembly according to the embodiment of the first aspect of the present application, the electrode assembly being disposed in the accommodation space; and an end cap connected to the housing, the end cap and the housing encapsulating the electrode assembly in the accommodation space.

[0012] In a third aspect, an embodiment of the present application provides an electrical device including the battery cell according to the embodiment of the second aspect of the present application.

[0013] In a fourth aspect, an embodiment of the present application provides a manufacturing device for an electrode assembly, for manufacturing the electrode assembly according to the embodiment of the first aspect of the present application. The manufacturing device for the electrode assembly includes: a composite folding mechanism including a folding roller, and a first protrusion extending along the axial direction of the folding roller is provided on the outer peripheral surface of the folding roller.

[0014] In an embodiment of the fourth aspect of the present application, a second protrusion extending along the circumferential direction of the folding roller is further provided on the outer peripheral surface of the folding roller, and at least two second protrusions are provided, respectively located at both ends of the folding roller along its axial direction.

[0015] In the electrode assembly, battery cell, electrical device, and manufacturing device for the electrode assembly provided by the embodiments of the present application, the first electrode sheet of the electrode assembly is reciprocally folded into a plurality of sequentially connected first sub-electrode sheets, separator sheets are disposed on both sides of the first electrode sheet and are folded together with the first electrode sheet, and the second electrode sheet is inserted between two adjacent first sub-electrode sheets. The separator wraps the first electrode sheet, and after being compounded into one body, it is bent integrally, which can protect the first electrode sheet. The second electrode sheet does not need to be bent and is inserted between the first sub-electrode sheets, which can protect the second electrode sheet. When manufacturing the electrode assembly, only the second electrode sheet needs to be cut, reducing the number of cutting times and also reducing the alignment difficulty between the first electrode sheet and the second electrode sheet. Therefore, the manufacturing efficiency of the electrode assembly can be improved. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the following described drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram before the first electrode sheet and the separator of the electrode assembly according to the embodiment of the present application are folded.

[0018] Figure 2 For Figure 1 a schematic structural view of a first electrode sheet and a separator of the electrode assembly according to an embodiment of the present application in the A-A cross-section.

[0019] Figure 3 a schematic structural view of an electrode assembly according to an embodiment of the present application.

[0020] Figure 4 a schematic structural view of a first electrode sheet of the electrode assembly according to an embodiment of the present application before folding.

[0021] Figure 5 a schematic structural view of a first electrode sheet of the electrode assembly according to an embodiment of the present application after cutting.

[0022] Figure 6 a schematic structural view of the electrode assembly according to an embodiment of the present application with the separator hidden.

[0023] Figure 7 another schematic structural view of a first electrode sheet of the electrode assembly according to an embodiment of the present application before folding.

[0024] Figure 8 an explosion schematic view of a battery cell according to an embodiment of the present application.

[0025] Figure 9 a schematic view of an electrical device according to an embodiment of the present application.

[0026] Figure 10 a schematic structural view of a composite folding mechanism of a manufacturing device for an electrode assembly according to an embodiment of the present application.

[0027] Figure 11 a schematic structural view of a folding roller of a composite folding mechanism of a manufacturing device for an electrode assembly according to an embodiment of the present application.

[0028] Reference numerals:

[0029] 1, first electrode sheet; 11, first sub-electrode sheet; 12, first notch; 13, first tab;

[0030] 2, separator;

[0031] 3, second electrode sheet; 31, second notch; 32, second tab;

[0032] 100, battery cell; 200, housing; 300, end cap; 400, electrode assembly;

[0033] 10, folding roller; 101, first protrusion; 102, second protrusion. Detailed implementation manners

[0034] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to those skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present application by showing examples of the present application.

[0035] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The embodiments will be described in detail below with reference to the accompanying drawings.

[0036] Relative terms such as first and second are used solely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual such relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0037] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "above" or "over" another layer or another region, it may mean directly above the other layer or another region, or there may be other layers or regions between it and the other layer or another region. And if the component is flipped, this layer or region will be "below" or "beneath" the other layer or another region.

[0038] In addition, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0039] It should be understood that in the embodiments of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0040] The applicant has found that in the process of manufacturing an electrode assembly, single positive and negative electrode sheets are obtained by cutting, and then the separator is repeatedly folded in both directions, and then the positive and negative electrode sheets are respectively inserted into the inner sides of the folded parts of the separator. Since both the positive and negative electrode sheets need to be cut separately, the number of cutting operations is relatively large, which not only makes the process more complex, but also easily introduces impurities and causes damage to the electrode assembly. In addition, during the insertion of the positive and negative electrode sheets, it is necessary to position the relative positions of the positive electrode sheet, the negative electrode sheet, and the separator. Taking the case where the positive and negative electrode sheets are rectangular as an example, the four corners of the positive and negative electrode sheets need to be positioned. Therefore, there are many positioning control points, which also makes the process more complex. In summary, the common manufacturing process of the electrode assembly is relatively complex and has low efficiency.

[0041] In view of the above analysis, the applicant proposes an electrode assembly, a battery cell, an electrical device, and a manufacturing device for the electrode assembly. The electrode assembly includes a first electrode sheet, a second electrode sheet, and a separator. The first electrode sheet is repeatedly folded into a plurality of first sub-electrode sheets connected in sequence, and the separator is disposed on both sides of the first electrode sheet and folded together with the first electrode sheet. The second electrode sheet is inserted between two adjacent first sub-electrode sheets. The separator wraps the first electrode sheet, and after being compounded into one body, it is bent integrally, which can protect the first electrode sheet. The second electrode sheet does not need to be bent and is inserted between the first sub-electrode sheets, which can protect the second electrode sheet. When manufacturing the electrode assembly, only the second electrode sheet needs to be cut, reducing the number of cutting operations and also reducing the alignment difficulty between the first electrode sheet and the second electrode sheet. Therefore, the manufacturing efficiency of the electrode assembly can be improved.

[0042] Figure 1 FIG. is a schematic structural diagram of the first electrode sheet and the separator of the electrode assembly according to an embodiment of the present application before folding. Figure 2 is Figure 1 a schematic structural diagram of the first electrode sheet and the separator of the electrode assembly according to an embodiment of the present application in the A-A cross-section of FIG. Figure 3 FIG. is a schematic structural diagram of the electrode assembly according to an embodiment of the present application.

[0043] Please refer to Figures 1 to 3 , an embodiment of the present application provides an electrode assembly, including: a first electrode sheet 1, the first electrode sheet 1 is repeatedly folded multiple times into a plurality of first sub-electrode sheets 11 connected in sequence; a plurality of separators 2, at least two separators 2 respectively cover both sides of the first electrode sheet 1; a plurality of second electrode sheets 3, having a polarity opposite to that of the first electrode sheet 1, and the second electrode sheets 3 are disposed between two adjacent first sub-electrode sheets 11.

[0044] The first electrode sheet 1 and the second electrode sheet 3 have opposite polarities. For the convenience of description, in the embodiment of the present application, the first electrode sheet 1 may be a negative electrode sheet, and the second electrode sheet 3 may be a positive electrode sheet.

[0045] The separator 2 is provided with at least two layers that respectively cover both sides of the first electrode sheet 1, forming a three-layer structure of separator 2 - first electrode sheet 1 - separator 2. When manufacturing the electrode assembly, the coil material corresponding to the first electrode sheet 1 and the coil material of the separator 2 can be directly unrolled and compounded into a three-layer structure. The three-layer structure is repeatedly bent, and during the folding process, the three-layer structure alternately bends towards both sides, presenting a Z-shaped fold line. Crease lines are formed at the bending positions, and multiple crease lines formed by repeated bending can divide the first electrode sheet 1 into multiple segments connected in sequence, with each segment corresponding to a first sub-electrode sheet 11.

[0046] The second electrode sheet 3 is arranged between two adjacent first sub-electrode sheets 11. Taking two adjacent first sub-electrode sheets 11 as an example, the two first sub-electrode sheets 11 are bent and connected, and a crease line is formed at the bending position to separate the two first sub-electrode sheets 11. After bending, one side of these two first sub-electrode sheets 11 faces each other, and the other side faces away from each other. The second electrode sheet 3 can be inserted between the facing sides of these two first sub-electrode sheets 11. Considering that after each folding, there will always be one side of two adjacent first sub-electrode sheets 11 facing each other at the bending position, therefore, a second electrode sheet 3 can be arranged at each bending position. Thus, multiple second electrode sheets 3, the folded first electrode sheet 1, and the separator 2 can be stacked to form an electrode assembly.

[0047] The separator 2 covers both sides of the first electrode sheet 1, so the separator 2 can protect the first electrode sheet 1 and reduce the possibility of damage to the first electrode sheet 1 when the first electrode sheet 1 is bent. The second electrode sheet 3 is inserted between two adjacent first sub-electrode sheets 11, which can protect the unfolded second electrode sheet 3 and reduce the possibility of damage to the second electrode sheet 3. Therefore, the electrode assembly of the embodiment of the present application can reduce the risk of damage to the first electrode sheet 1 and the second electrode sheet 3.

[0048] When manufacturing the electrode assembly of the embodiment of the present application, mainly the second electrode sheet 3 is cut, and the cutting of the first electrode sheet 1 is reduced, so that the total number of cutting times is reduced. This can not only simplify the manufacturing process of the electrode assembly but also reduce the risk of introducing impurities during cutting. In addition, the separator 2 covers both sides of the first electrode sheet 1, reducing the number of positioning control points between the separator 2 and the first electrode sheet 1; when the second electrode sheet 3 is inserted after the first electrode sheet 1 is folded, the number of positioning control points between the first electrode sheet 1 and the second electrode sheet 3 can also be reduced. Exemplarily, when the first sub-electrode and the second electrode sheet 3 are rectangular, the control points between the first electrode sheet 1 and the separator 2 can be reduced from 4 to 2, and the control points between the first electrode sheet 1 and the second electrode sheet 3 can be reduced from 4 to 3. By reducing the number of positioning control points, the positioning and correction process of the electrode assembly can also be reduced, and the manufacturing efficiency of the electrode assembly of the embodiment of the present application can be improved.

[0049] Further, continue to refer to Figures 1 to 3, along the thickness direction of the electrode assembly, the orthographic projection of the first sub-electrode plate 11 covers the orthographic projection of the second electrode plate 3.

[0050] The size of the first sub-electrode plate 11 can be the same as that of the second electrode plate 3 or larger than that of the second electrode plate 3. Therefore, after the second electrode plate 3 is inserted between two adjacent first sub-electrode plates 11, the second electrode plate 3 may not protrude from the outer edge of the first sub-electrode plate 11, so that the first sub-electrode plate 11 and the separator 2 can protect the second electrode plate 3 and reduce the risk of damage to the electrode assembly in the embodiments of the present application.

[0051] Further, continue to refer to Figures 1 to 3 , along the thickness direction of the electrode assembly, the orthographic projection of the first sub-electrode plate 11 is located within the orthographic projection of the separator 2; the separators 2 on both sides of the first electrode plate 1 are at least partially connected.

[0052] The size of the separator 2 is larger than that of the first sub-electrode plate 11, so that the edge of the separator 2 can protrude from the edge of the first electrode plate 1, that is, the separator 2 can completely wrap the first electrode plate 1, which can not only reduce the short-circuit risk between the first electrode plate 1 and the second electrode plate 3, but also reduce the risk of damage to the first electrode plate 1 when the first electrode plate 1 is bent. Among the separators 2 on both sides of the first electrode plate 1, the parts protruding from the edge of the first electrode plate 1 can be pasted together to encapsulate the first electrode plate 1, which can reduce the influence of foreign objects on the first electrode plate 1.

[0053] Figure 4 This is a schematic structural diagram of the first electrode plate of the electrode assembly in the embodiments of the present application before folding.

[0054] Further, please refer to Figure 4 , along the width direction of the first electrode plate 1, at least one end of the folding part of the first electrode plate 1 is provided with a first notch 12.

[0055] In the process of manufacturing the electrode assembly in the embodiments of the present application, before the first electrode plate 1 is bent, the material of the first electrode plate 1 can be punched by a V-angle die to form the first notch 12. When folding the first electrode plate 1, the bending part can be located at the first notch 12 with the first notch 12 as a reference. Through the positioning of the first notch 12, the bending part can be accurately positioned, so that the sizes of the multiple first sub-electrode plates 11 formed by the bent first electrode plate 1 are basically the same, improving the manufacturing accuracy of the electrode assembly in the embodiments of the present application. In addition, when bending, due to the existence of the first notch 12, the bending is easier, thereby reducing the difficulty of the folding operation.

[0056] Figure 5 This is a schematic structural diagram of the first electrode plate of the electrode assembly in the embodiments of the present application after cutting.

[0057] Further, please refer to Figure 5 , both ends of the second electrode sheet 3 along its length direction are provided with second notches 31, and the second notches 31 are located at at least one end of the second electrode sheet 3 along its width direction.

[0058] In the process of manufacturing the electrode assembly of the embodiment of the present application, before cutting the second electrode sheet 3, the material of the second electrode sheet 3 can be punched by a V-angle die to form the second notch 31. When cutting the second electrode sheet 3, the cutting position can be based on the second notch 31, so that the cutting position is located at the second notch 31. Through the positioning of the second notch 31, the cutting position can be accurately positioned, so that the sizes of the cut second electrode sheets 3 are basically the same, improving the manufacturing accuracy of the electrode assembly of the embodiment of the present application. In addition, when cutting, due to the existence of the second notch 31, the cutting is made easier, thereby reducing the difficulty of the cutting operation.

[0059] Figure 6 FIG. is a schematic structural diagram of the electrode assembly of the embodiment of the present application after removing the separator.

[0060] Further, please refer to Figure 6 , the electrode assembly further includes a first tab 13 and a second tab 32; the number of the first tabs 13 is multiple and is connected to the first sub-electrode sheets 11 in one-to-one correspondence; the number of the second tabs 32 is multiple and is connected to the second electrode sheets 3 in one-to-one correspondence; along the thickness direction of the electrode assembly, the orthographic projections of the multiple first tabs 13 overlap, the orthographic projections of the multiple second tabs 32 overlap, and the orthographic projections of the multiple first tabs 13 and the orthographic projections of the multiple second tabs 32 are arranged at intervals.

[0061] The number of the first tabs 13 is multiple and is connected to the first sub-electrode sheets 11 in one-to-one correspondence. Along the thickness direction of the electrode assembly, the orthographic projections of the multiple first tabs 13 overlap, which facilitates the connection between the first electrode sheet 1 and the outside. When the electrode assembly of the embodiment of the present application is applied to a battery cell, multiple first tabs 13 can be connected to one pole column of the battery cell to form one of the positive and negative electrodes of the battery cell. Similarly, the number of the second tabs 32 is multiple and is connected to the second electrode sheets 3 in one-to-one correspondence. Along the thickness direction of the electrode assembly, the orthographic projections of the multiple second tabs 32 overlap, which facilitates the connection between the second electrode sheet 3 and the outside. When the electrode assembly of the embodiment of the present application is applied to a battery cell, multiple second tabs 32 can be connected to the other pole column of the battery cell 100 to form the other of the positive and negative electrodes of the battery cell.

[0062] In addition, along the thickness direction of the electrode assembly, the orthographic projections of the multiple first tabs 13 and the orthographic projections of the multiple second tabs 32 are arranged at intervals, reducing the risk of short circuit between the first tab 13 and the second tab 32, and also facilitating the connection of the first tab 13 and the second tab 32 to the outside respectively.

[0063] Figure 7 Another structural schematic diagram before folding the first electrode sheet of the electrode assembly according to the embodiment of the present application.

[0064] Further, please refer to Figure 7 , the distances from the first pole ears 13 corresponding to two adjacent first sub-pole sheets 11 to the connection part of the two adjacent first sub-pole sheets 11 are equal.

[0065] Taking two adjacent first sub-pole sheets 11 as an example for illustration, the distances from the first pole ears 13 of these two first sub-pole sheets 11 to the connection part between these two first sub-pole sheets 11 are equal. After these two first sub-pole sheets 11 are bent, the orthographic projections of the two first pole ears 13 along the thickness direction of the electrode assembly can overlap. After the first electrode sheet 1 is completely bent, the orthographic projections of all the first pole ears 13 along the thickness direction of the electrode assembly can overlap.

[0066] Considering that the second electrode sheet 3 adopts a single-piece form, only by setting the second pole ears 32 at the same positions of each second electrode sheet 3, the orthographic projections of all the second pole ears 32 along the thickness direction of the electrode assembly can overlap.

[0067] Figure 8 An explosion schematic diagram of a battery cell according to the embodiment of the present application.

[0068] Please refer to Figure 8 , the embodiment of the present application further provides a battery cell 100, including: a housing 200 having an accommodation space; the electrode assembly 400 of the foregoing embodiment of the present application, and the electrode assembly 400 is disposed in the accommodation space; an end cap 300 connected to the housing 200, and the end cap 300 and the housing 200 encapsulate the electrode assembly 400 in the accommodation space.

[0069] The housing 200 and the end cap 300 can be connected together to form a hollow box-shaped structure, and the internal part is the accommodation space of the housing 200, and the electrode assembly 400 can be installed in the accommodation space. After the end cap 300 and the housing 200 are connected together, the electrode assembly 400 can be protected. It should be noted that the number of the electrode assemblies 400 can be at least one.

[0070] Figure 9 A schematic diagram of an electrical device according to the embodiment of the present application.

[0071] Please refer to Figure 9, embodiments of the present application further provide an electrical device, including the battery cell 100 of the foregoing embodiments of the present application. Exemplarily, the electrical device may be an electrical device such as a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, or a spacecraft. Embodiments of the present application will be described by taking the electrical device as an electric vehicle as an example. A single battery cell 100 can directly supply power to the electrical device, or multiple battery cells 100 can form a battery pack to supply power to the electrical device together.

[0072] Embodiments of the present application further provide a manufacturing device for an electrode assembly 400, which is used to manufacture the electrode assembly 400 of the foregoing embodiments of the present application.

[0073] Figure 10 It is a schematic structural diagram of a composite folding mechanism of the manufacturing device for the electrode assembly of the embodiments of the present application. Figure 11 It is a schematic structural diagram of a folding roller of a composite folding mechanism of the manufacturing device for the electrode assembly of the embodiments of the present application.

[0074] Please refer to Figure 10 and Figure 11 , the manufacturing device for the electrode assembly 400 of the embodiments of the present application includes: a composite folding mechanism, including a folding roller 10, and a first protrusion 101 extending along the axial direction of the folding roller 10 is provided on the outer peripheral surface of the folding roller 10.

[0075] Before folding, the materials of the first electrode sheet 1 and the separator 2 are in a rolled state. Two rolls of separator 2 materials are respectively arranged on both sides of the first electrode sheet 1 material roll. The first electrode sheet 1 material roll and the separator 2 material roll are simultaneously unrolled to form a three-layer structure. By pressing the three-layer structure with the folding roller 10, while pressing the three-layer structure into a whole, the first protrusion 101 of the folding roller 10 can press the three-layer structure, so that the first electrode sheet 1 and the separators 2 on both sides can be bent synchronously. The position where the first protrusion 101 presses the three-layer structure corresponds to the bending position of the first electrode sheet 1. At least two folding rollers 10 alternately press the three-layer structure from both sides of the three-layer structure, which can make the three-layer structure fold repeatedly. Exemplarily, a hydraulic cylinder can be used to move the folding roller 10 closer to or farther from the three-layer structure. Considering that the first electrode sheet 1 and the separator 2 can enter the composite folding mechanism in a strip form, and the folded first electrode sheet 1 can be directly discharged, therefore, the composite folding mechanism can be an institution on the production line of the manufacturing device for the electrode assembly 400 of the embodiments of the present application. That is to say, the unrolling process, the cutting process of the second electrode sheet 3, the insertion of the second electrode sheet 3, the positioning and deviation correction process of the second electrode sheet 3 can all adopt conventional devices in the technical field of the present application. Since the cutting of the first electrode sheet 1 is reduced, the manufacturing efficiency of the electrode assembly 400 can be improved.

[0076] Further, continue to refer to Figure 11, a second protrusion 102 extending along the circumferential direction of the folding roller 10 is further provided on the outer circumferential surface of the folding roller 10. There are at least two second protrusions 102, which are respectively located at both ends of the folding roller 10 along its axial direction.

[0077] Considering that the size of the separator 2 is larger than that of the first sub-electrode sheet 11, so that the edge of the separator 2 can protrude from the edge of the first electrode sheet 1. When the folding roller 10 squeezes the three-layer structure formed by the first electrode sheet 1 and the separators 2 on both sides, the second protrusion 102 can squeeze the part where the edge of the separator 2 protrudes from the edge of the first electrode sheet 1, and make the separators 2 on both sides of the first electrode sheet 1 fit together, thereby protecting the first electrode sheet 1 and reducing the entry of impurities into the electrode assembly 400, and further reducing the influence of impurities on the electrode assembly 400.

[0078] In summary, the embodiment of the present application provides an electrode assembly, a battery cell, an electrical device and a manufacturing device for the electrode assembly. The first electrode sheet of the electrode assembly is reciprocally folded into a plurality of successively connected first sub-electrode sheets. The separator is arranged on both sides of the first electrode sheet and folded together with the first electrode sheet. The second electrode sheet is inserted between two adjacent first sub-electrode sheets. The separator wraps the first electrode sheet and is integrally bent after being compounded into one body, which can protect the first electrode sheet. The second electrode sheet does not need to be bent and is inserted between the first sub-electrode sheets, which can protect the second electrode sheet. When manufacturing the electrode assembly, only the second electrode sheet needs to be cut, reducing the number of cutting times and also reducing the alignment difficulty between the first electrode sheet and the second electrode sheet. Therefore, the manufacturing efficiency of the electrode assembly can be improved.

[0079] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An electrode assembly, characterized in that, Comprising: A first electrode sheet, which is repeatedly folded back and forth into a plurality of first sub-electrode sheets connected in sequence; A plurality of separators, at least two of which respectively cover both sides of the first electrode sheet; A plurality of second electrode sheets, having polarities opposite to those of the first electrode sheet, and the second electrode sheets are disposed between two adjacent first sub-electrode sheets.

2. The electrode assembly according to claim 1, wherein Along the width direction of the first electrode sheet, at least one end of the folding portion of the first electrode sheet is provided with a first notch.

3. The electrode assembly according to claim 1, characterized in that, Both ends of the second electrode sheet along its own length direction are provided with second notches, and the second notches are located at at least one end of the second electrode sheet along its own width direction.

4. The electrode assembly according to claim 1, characterized in that Along the thickness direction of the electrode assembly, the orthographic projection of the first sub-electrode sheet covers the orthographic projection of the second electrode sheet.

5. The electrode assembly according to claim 1, characterized in that, Along the thickness direction of the electrode assembly, the orthographic projection of the first sub-electrode sheet is located within the orthographic projection of the separator; the separators located on both sides of the first electrode sheet are at least partially connected.

6. The electrode assembly according to claim 1, characterized in that, The electrode assembly further includes a first tab and a second tab; the number of the first tabs is multiple, and they are connected to the first sub-electrode sheets in one-to-one correspondence; the number of the second tabs is multiple, and they are connected to the second electrode sheets in one-to-one correspondence; along the thickness direction of the electrode assembly, the orthographic projections of the multiple first tabs overlap, the orthographic projections of the multiple second tabs overlap, and the orthographic projections of the multiple first tabs and the orthographic projections of the multiple second tabs are arranged at intervals.

7. The electrode assembly according to claim 6, wherein The distances from the first tabs corresponding to two adjacent first sub-electrode sheets to the connection portion of the two adjacent first sub-electrode sheets are equal.

8. A battery cell, characterized in that, Comprising: A housing having an accommodation space; The electrode assembly according to any one of claims 1 to 7, the electrode assembly being disposed in the accommodation space; An end cap connected to the housing, and the end cap and the housing encapsulate the electrode assembly in the accommodation space.

9. An electrical device, characterized in that, Including the battery cell according to claim 8.

10. A manufacturing device for an electrode assembly, characterized in that, For manufacturing the electrode assembly according to any one of claims 1 to 7, the manufacturing equipment of the electrode assembly includes: A composite folding mechanism, including a folding roller, and a first protrusion extending along its own axial direction is provided on the outer peripheral surface of the folding roller.

11. The manufacturing apparatus for the electrode assembly according to claim 10, characterized in that, A second protrusion extending along the circumferential direction of the folding roller is further provided on the outer peripheral surface of the folding roller, and at least two second protrusions are provided, respectively located at both ends of the folding roller along its own axial direction.

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