Electrode assembly

Abstract

The utility model relates to an electrode assembly. The electrode assembly comprises a positive plate, a negative plate and diaphragms, the positive plate, the negative plate and the diaphragms are stacked and wound, the two faces of the positive plate are each provided with one diaphragm, and the two faces of the negative plate are each provided with one diaphragm; the positive plate comprises a positive current collector and a positive lug; the negative plate comprises a negative current collector and a negative lug; a first insulating coating is arranged on one surface, directly facing the positive tab, of the diaphragm, and covers the joint of the positive tab and the positive current collector; the diaphragm is provided with a second insulating coating; the second insulating coating is over against the back surface of the joint of the positive lug and the positive current collector; a third insulating coating is arranged on one surface, which is over against the negative tab, of the diaphragm; the third insulating coating covers the joint of the negative tab and the negative current collector; and the diaphragm is provided with a fourth insulating coating, and the fourth insulating coating is over against the back surface of the joint of the negative tab and the negative current collector. According to the scheme, the overall thickness of the electrode assembly can be adjusted.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an electrode assembly. Background Art

[0002] In the production process of 3C consumer wound lithium-ion batteries, gluing the positive and negative electrodes is an essential step. The gluing locations are mainly at the positive tabs and head and tail positions of the positive electrode sheets, and at the negative tabs and head and tail positions of the negative electrode sheets. The main function of gluing is to prevent lithium deposition due to uneven thinning of the head and tail of the electrode sheets during the charge and discharge process of lithium-ion batteries, thereby causing safety problems. However, gluing will increase the process cost and cause the thickness of the electrode assembly to increase, affecting the energy density of the electrode assembly, which is not conducive to product competition. Utility Model Content

[0003] In order to solve or partially solve the problems existing in the related art, the present application provides an electrode assembly that can reduce the overall thickness of the electrode assembly.

[0004] The first aspect of the present application provides an electrode assembly, which includes a positive electrode sheet, a negative electrode sheet and a separator, wherein the positive electrode sheet, the negative electrode sheet and the separator are stacked and wound, and each side of the positive electrode sheet has a layer of separator, and each side of the negative electrode sheet has a layer of separator; the positive electrode sheet includes a positive electrode collector and a positive electrode ear, one end of the positive electrode ear is connected to one side of the positive electrode collector, and the other end of the positive electrode ear extends outward along the width direction of the positive electrode collector; the negative electrode sheet includes a negative electrode collector and a negative electrode ear, one end of the negative electrode ear is connected to one side of the negative electrode collector, and the other end of the negative electrode ear extends outward along the width direction of the negative electrode collector The width direction of the current collector extends outward; the first insulating coating is provided on the side of the diaphragm facing the positive electrode ear, and the first insulating coating covers the connection between the positive electrode ear and the positive current collector; the diaphragm is provided with a second insulating coating, and the second insulating coating faces the back side of the connection between the positive electrode ear and the positive current collector; the third insulating coating is provided on the side of the diaphragm facing the negative electrode ear, and the third insulating coating covers the connection between the negative electrode ear and the negative current collector; the diaphragm is provided with a fourth insulating coating, and the fourth insulating coating faces the back side of the connection between the negative electrode ear and the negative current collector.

[0005] Furthermore, the positive electrode current collector includes a first blank area and a first area coated with a positive electrode active material coating, and the connection between the positive electrode tab and the positive electrode current collector is located in the first blank area.

[0006] Furthermore, the diaphragm is provided with a fifth insulating coating, and the fifth insulating coating covers the junction between the first blank area and the first region.

[0007] Furthermore, the first blank area includes a first giveway area and a first side area, the positive electrode ear is connected to the first giveway area, the first area is surrounded by the first giveway area, the first side area is located on one side of the length direction of the first area, and the diaphragm is provided with a sixth insulating coating, and the sixth insulating coating is located between the first insulating coating and the fifth insulating coating.

[0008] Furthermore, the first blank areas are located at both ends of the positive electrode current collector, and the first region is located between the two first blank areas.

[0009] Furthermore, the negative electrode current collector includes a second blank area and a second area coated with a negative electrode active material coating, and the connection between the negative electrode tab and the negative electrode current collector is located in the second blank area.

[0010] Furthermore, the separator is provided with a seventh insulating coating layer, the seventh insulating coating layer is opposite to the second region, and the seventh insulating coating layer and the third insulating coating layer are located on the same side of the negative electrode current collector.

[0011] Furthermore, the separator is provided with an eighth insulating coating layer, the eighth insulating coating layer is opposite to the second blank area, and the eighth insulating coating layer and the third insulating coating layer are located on the same side of the negative electrode current collector.

[0012] Furthermore, the separator is provided with a ninth insulating coating layer, the ninth insulating coating layer is opposite to the second blank area, and the ninth insulating coating layer and the fourth insulating coating layer are located on the same side of the negative electrode current collector.

[0013] Furthermore, an edge of the second region of the side of the negative electrode current collector connected to the negative electrode tab is aligned with an edge of the ninth insulating coating layer.

[0014] The technical solution provided by the present application may include the following beneficial effects: the present application reduces the gluing process, improves the production efficiency of the electrode assembly, reduces the production cost, and reduces the overall thickness of the electrode assembly by coating the first insulating coating, the second insulating coating, the third insulating coating and the fourth insulating coating on the surface of the diaphragm, and uses the first insulating coating, the second insulating coating, the third insulating coating and the fourth insulating coating to replace the existing positive electrode sheet and negative electrode sheet surface gluing method, thereby improving the production efficiency of the electrode assembly, reducing the production cost, and reducing the overall thickness of the electrode assembly, thereby improving the energy density of the electrode assembly.

[0015] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0017] Figure 1 1 is a top view of the positive electrode sheet shown in an embodiment of the present application;

[0018] Figure 2 is a plan view of the positive electrode current collector shown in an embodiment of the present application;

[0019] Figure 3 1 is a top view of the negative electrode sheet shown in an embodiment of the present application;

[0020] Figure 4 is a plan view of the negative electrode current collector shown in an embodiment of the present application;

[0021] Figure 5 1 is another structural schematic diagram of the positive electrode sheet shown in an embodiment of the present application;

[0022] Figure 6 This is another structural schematic diagram of the negative electrode sheet shown in an embodiment of the present application.

[0023] Figure 1: Positive electrode sheet 1; positive electrode current collector 11; first blank area 111; first region 112; positive electrode ear 12; negative electrode sheet 2; negative electrode current collector 21; second blank area 211; second region 212; negative electrode ear 22; separator 3; first insulating coating 31; second insulating coating 32; third insulating coating 33; fourth insulating coating 34; fifth insulating coating 35; sixth insulating coating 36; seventh insulating coating 37; eighth insulating coating 38; ninth insulating coating 39; tenth insulating coating 40; eleventh insulating coating 41. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present application in more detail with reference to the accompanying drawings. Although the accompanying drawings illustrate embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0025] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0027] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," and the like should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0028] In response to the above problems, an embodiment of the present application provides an electrode assembly that can reduce the overall thickness of the electrode assembly.

[0029] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0030] Figure 1 1 is a top view of the positive electrode sheet shown in an embodiment of the present application; Figure 3 This is a top view of the negative electrode sheet shown in the embodiment of the present application.

[0031] See also Figure 1 and Figure 3The electrode assembly includes a positive electrode sheet 1, a negative electrode sheet 2 and a separator 3. The positive electrode sheet 1, the negative electrode sheet 2 and the separator 3 are stacked and wound together to form a roll core. In order to ensure that the positive electrode sheet 1 and the negative electrode sheet 2 in the roll core do not short-circuit, there can be two separators 3, and the two separators 3 are compounded on the two opposite sides of the positive electrode sheet 1 or on the two opposite sides of the negative electrode sheet 2, so that after the positive electrode sheet 1, the negative electrode sheet 2 and the roll core are wound, there is a layer of separator 3 on each side of the positive electrode sheet 1, and a layer of separator 3 on each side of the negative electrode sheet 2.

[0032] See also Figure 1 and Figure 3 The positive electrode sheet 1 includes a positive electrode current collector 11 and a positive electrode tab 12. One end of the positive electrode tab 12 is connected to one side of the positive electrode current collector 11, and the other end of the positive electrode tab 12 extends outward along the width direction of the positive electrode current collector 11. The negative electrode sheet 2 includes a negative electrode current collector 21 and a negative electrode tab 22. One end of the negative electrode tab 22 is connected to one side of the negative electrode current collector 21, and the other end of the negative electrode tab 22 extends outward along the width direction of the negative electrode current collector 21.

[0033] See also Figure 1 and Figure 3 In one of the separators 3, a first insulating coating 31 is provided on the side of the separator 3 facing the positive electrode tab 12. The first insulating coating 31 can cover the connection between the positive electrode tab 12 and the positive electrode current collector 11. A second insulating coating 32 is provided on the other separator 3. The second insulating coating 32 faces the back of the connection between the positive electrode tab 12 and the positive electrode current collector 11. The second insulating coating 32 corresponds to the first insulating coating 31, and the connection between the positive electrode tab 12 and the positive electrode current collector 11 is located between the second insulating coating 32 and the first insulating coating 31. In one of the separators 3, a third insulating coating 33 is provided on the side of the separator 3 facing the negative electrode tab 22. The third insulating coating 33 covers the connection between the negative electrode tab 22 and the negative electrode current collector 21. A fourth insulating coating 34 is provided on another separator 3. The fourth insulating coating 34 is opposite to the back of the connection between the negative electrode ear 22 and the negative electrode current collector 21. The fourth insulating coating 34 corresponds to the third insulating coating 33. The connection between the negative electrode ear 22 and the negative electrode current collector 21 is located in the middle of the fourth insulating coating 34 and the third insulating coating 33.

[0034] The present application reduces the gluing process, improves the production efficiency of the electrode assembly, reduces the production cost, and reduces the overall thickness of the electrode assembly by coating the first insulating coating 31, the second insulating coating 32, the third insulating coating 33 and the fourth insulating coating 34 on the surface of the diaphragm 3, and uses the first insulating coating 31, the second insulating coating 32, the third insulating coating 33 and the fourth insulating coating 34 to replace the existing surface gluing method of the positive electrode sheet 1 and the negative electrode sheet 2, thereby improving the energy density of the electrode assembly.

[0035] Figure 2 It is a plan view of the positive electrode current collector shown in an embodiment of the present application.

[0036] See also Figure 1 and Figure 2 The positive electrode current collector 11 includes a first blank area 111 and a first area 112 coated with a positive electrode active material coating, and the connection between the positive electrode ear 12 and the positive electrode current collector 11 is located in the first blank area 111. Specifically, the positive electrode current collector 11 can be an aluminum foil, the portion of the aluminum foil surface that is not coated with the positive electrode active material coating is the first blank area 111, and the portion of the aluminum foil surface that is coated with the positive electrode active material coating is the first area 112. The diaphragm 3 is provided with a fifth insulating coating 35, and the fifth insulating coating 35 covers the junction of the first blank area 111 and the first area 112, wherein a portion of the fifth insulating coating 35 faces the first blank area 111, and a portion of the fifth insulating coating 35 faces the first area 112. The fifth insulating coating 35 can prevent the junction of the first blank area 111 and the first area 112 from being unevenly thinned, thereby causing lithium deposition.

[0037] See also Figure 1 In one embodiment, the first blank region 111 includes a first clearance region and a first side region. The positive electrode tab 12 is connected to the first clearance region. The first region 112 surrounds the first clearance region. The first region 112 surrounds the connection between the positive electrode tab 12 and the positive electrode current collector 11. The positive electrode current collector 11 also has a first clearance region on the back side of the connection between the positive electrode tab 12 and the positive electrode current collector 11. The two first clearance regions are of the same size and correspond to each other. The area of the first insulating coating 31 is larger than that of the first clearance region, and the first insulating coating 31 completely covers one of the first clearance regions. The area of the second insulating coating 32 is larger than that of the first clearance region, and the second insulating coating 32 completely covers the other first clearance region. The first side region is located on one side of the first region 112 in the longitudinal direction. One of the separators 3 is provided with a sixth insulating coating 36, which is located between the first insulating coating 31 and the fifth insulating coating 35. The other separator 3 also has a tenth insulating coating layer 40. The tenth insulating coating layer 40 and the second insulating coating layer 32 are located on the same side of the positive electrode current collector 11, and the tenth insulating coating layer 40 is located between the second insulating coating layer 32 and the fifth insulating coating layer. The thickness of the first insulating coating layer 31 and the second insulating coating layer 32 is 1-12 μm, the width of the first insulating coating layer 31 and the second insulating coating layer 32 is 14-24 μm, and the length of the first insulating coating layer 31 and the second insulating coating layer 32 is 26-36 μm. The thickness of the sixth insulating coating layer 36 and the tenth insulating coating layer 40 is 1-12 μm, the width of the sixth insulating coating layer 36 and the tenth insulating coating layer 40 is 16-26 μm, and the length of the sixth insulating coating layer 36 and the tenth insulating coating layer 40 is 24-34 μm. The thickness of the fifth insulating coating layer 35 is 1-12 μm, and the length and width of the fifth insulating coating layer 35 are both 15-20 μm.

[0038] Figure 5 This is another structural schematic diagram of the positive electrode sheet shown in an embodiment of the present application.

[0039] See also Figure 5 In one embodiment, the first blank areas 111 are located at both ends of the positive electrode current collector 11, and the first region 112 is located between the two first blank areas 111. The connection between the positive electrode tab 12 and the positive electrode current collector 11 is on one of the first blank areas 111. The thickness of the first insulating coating 31, the second insulating coating 32, and the fifth insulating coating 35 is 1 to 12 μm, the width of the first insulating coating 31, the second insulating coating 32, and the fifth insulating coating 35 is 8 to 25 μm, and the length of the first insulating coating 31, the second insulating coating 32, and the fifth insulating coating 35 is 8 to 25 μm.

[0040] Figure 4 It is a plan view of the negative electrode current collector shown in an embodiment of the present application.

[0041] See also Figure 3 and Figure 4 The negative electrode current collector 21 includes a second blank area 211 and a second region 212 coated with a negative electrode active material coating. The connection between the negative electrode tab 22 and the negative electrode current collector 21 is located in the second blank area 211. Specifically, the positive electrode current collector 11 can be a copper foil. The portion of the copper foil surface not coated with a negative electrode active material coating is the second blank area 211, and the portion of the copper foil surface coated with a negative electrode active material coating is the second region 212. The second blank area 211 includes a second clearance area and a second side area. The negative electrode tab 22 is connected to the second clearance area.

[0042] See also Figure 3In one embodiment, the second region 212 surrounds the second clearance area, which surrounds the connection between the negative electrode tab 22 and the negative electrode current collector 21. The negative electrode current collector 21 also has a second clearance area on the back side of the connection between the negative electrode tab 22 and the negative electrode current collector 21. The two second clearance areas are identical in size and correspond to each other. The area of the third insulating coating 33 is larger than that of the second clearance area, and the third insulating coating 33 completely covers one of the second clearance areas. The area of the fourth insulating coating 34 is larger than that of the second clearance area, and the fourth insulating coating 34 completely covers the other second clearance area. One of the separators 3 is provided with a seventh insulating coating 37, which faces the second region 212 and is located on the same side of the negative electrode current collector 21 as the third insulating coating 33. The other separator 3 is also provided with an eleventh insulating coating 41, which faces the second region 212 and is located on the same side of the negative electrode current collector 21 as the fourth insulating coating 34. The thickness of the third insulating coating layer 33 and the fourth insulating coating layer 34 is 1 to 12 μm, the width of the third insulating coating layer 33 and the fourth insulating coating layer 34 is 14 to 24 μm, and the length of the third insulating coating layer 33 and the fourth insulating coating layer 34 is 26 to 36 μm. The thickness of the seventh insulating coating layer 37 and the eleventh insulating coating layer 41 is 1 to 12 μm, the width of the seventh insulating coating layer 37 and the eleventh insulating coating layer 41 is 6 to 18 μm, and the length of the seventh insulating coating layer 37 and the eleventh insulating coating layer 41 is 18 to 28 μm.

[0043] Figure 6 This is another structural schematic diagram of the negative electrode sheet shown in an embodiment of the present application.

[0044] See also Figure 6 In one embodiment, one separator 3 is provided with an eighth insulating coating layer 38, which faces the second blank area 211 and is located on the same side of the negative electrode current collector 21 as the third insulating coating layer 33. The other separator 3 is provided with a ninth insulating coating layer 39, which faces the second blank area 211 and is located on the same side of the negative electrode current collector 21 as the fourth insulating coating layer 34. The thickness of the third insulating coating layer 33, the fourth insulating coating layer 34, the eighth insulating coating layer 38, and the ninth insulating coating layer 39 are all 1 to 12 μm, the width of the third insulating coating layer 33, the fourth insulating coating layer 34, the eighth insulating coating layer 38, and the ninth insulating coating layer 39 are all 6 to 25 μm, and the length of the fourth insulating coating layer 34, the eighth insulating coating layer 38, and the ninth insulating coating layer 39 are all 6 to 25 μm. The edge of the second region 212 on the side of the negative electrode current collector 21 that connects to the negative electrode tab 22 is aligned with the edge of the ninth insulating coating layer 39.

[0045] See also Figure 1-6In some embodiments, the density of the first insulating coating 31, the first and second insulating coatings, the third insulating coating 33, the fourth insulating coating 34, the fifth insulating coating 35, the sixth insulating coating 36, the seventh insulating coating 37, the eighth insulating coating 38, the ninth insulating coating 39, the tenth insulating coating 40 and the eleventh insulating coating 41 are 1 to 20 g / m2, and the materials are the same, all consisting of inorganic fillers, binders, dispersants and thickeners, and all have good electronic and ionic insulation properties. The inorganic filler is one or more of barium oxide, silver oxide, yttrium oxide, calcium oxide, and titanium dioxide, and the inorganic filler can improve the insulation performance of the coating; the binder is one or more of epoxy resin, phenolic resin, urea-formaldehyde resin, polyurethane, polyvinyl acetal, perchlorethylene resin, chloroprene rubber, and nitrile rubber, and the binder is used to increase the adhesion of the insulating coating to prevent the powder from falling off when subjected to external force, thereby improving the safety performance of the battery; the dispersant is one or more of polyethylene glycol 200, polyethylene glycol 400, triethylhexyl phosphoric acid, sodium lauryl sulfate, methyl amyl alcohol, cellulose derivatives, polyacrylamide, gur gum, and fatty acid polyethylene glycol esters. The inorganic filler and the binder are uniformly mixed; the thickener is one or more of carboxymethyl cellulose, propylene glycol alginate, methyl cellulose, sodium starch phosphate, sodium carboxymethyl cellulose, sodium alginate, casein, sodium polyacrylate, polyoxyethylene, and polyvinyl pyrrolidone, and the thickener mainly plays a thickening and suspending role; the inorganic filler is calculated by mass fraction, the inorganic filler ratio is 60% to 80%, the binder ratio is 5% to 15%, the dispersant ratio is 10% to 20%, and the thickener ratio is 5% to 10%; the safety coating has good electronic and ionic insulation capabilities, and does not react with the electrolyte. The safety coating also has good thermal stability and corrosion resistance, and is not easy to fall off.

[0046] The scheme of the present application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the description are not necessarily required for this application. In addition, it is understood that the steps in the method of the embodiment of the present application can be adjusted in sequence, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0047] The embodiments of the present application have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. An electrode assembly, characterized in that: The positive electrode sheet, the negative electrode sheet and the separator are stacked and wound, and each side of the positive electrode sheet has a layer of separator, and each side of the negative electrode sheet has a layer of separator; The positive electrode sheet includes a positive electrode current collector and a positive electrode tab, one end of the positive electrode tab is connected to one side of the positive electrode current collector, and the other end of the positive electrode tab extends outward along the width direction of the positive electrode current collector; The negative electrode sheet includes a negative electrode current collector and a negative electrode tab, one end of the negative electrode tab is connected to one side of the negative electrode current collector, and the other end of the negative electrode tab extends outward along the width direction of the negative electrode current collector; The diaphragm is provided with a first insulating coating on a side facing the positive electrode ear, and the first insulating coating covers the connection between the positive electrode ear and the positive electrode collector; the diaphragm is provided with a second insulating coating, and the second insulating coating faces the back side of the connection between the positive electrode ear and the positive electrode collector; the diaphragm is provided with a third insulating coating on a side facing the negative electrode ear, and the third insulating coating covers the connection between the negative electrode ear and the negative electrode collector; the diaphragm is provided with a fourth insulating coating, and the fourth insulating coating faces the back side of the connection between the negative electrode ear and the negative electrode collector.

2. The electrode assembly according to claim 1, wherein: The positive electrode current collector includes a first blank area and a first area coated with a positive electrode active material coating. The connection between the positive electrode tab and the positive electrode current collector is located in the first blank area.

3. The electrode assembly according to claim 2, wherein: The diaphragm is provided with a fifth insulating coating, and the fifth insulating coating covers the junction between the first blank area and the first region.

4. The electrode assembly according to claim 3, wherein: The first blank area includes a first giveway area and a first side area, the positive electrode ear is connected to the first giveway area, the first area is surrounded by the first giveway area, the first side area is located on one side of the length direction of the first area, and the diaphragm is provided with a sixth insulating coating, and the sixth insulating coating is located between the first insulating coating and the fifth insulating coating.

5. The electrode assembly according to claim 2 or 3, characterized in that: The first blank areas are located at both ends of the positive electrode current collector, and the first region is located between the two first blank areas.

6. The electrode assembly according to claim 1, wherein: The negative electrode current collector includes a second blank area and a second area coated with a negative electrode active material coating, and the connection between the negative electrode tab and the negative electrode current collector is located in the second blank area.

7. The electrode assembly according to claim 6, wherein: The separator is provided with a seventh insulating coating layer, the seventh insulating coating layer is opposite to the second region, and the seventh insulating coating layer and the third insulating coating layer are located on the same side of the negative electrode current collector.

8. The electrode assembly according to claim 6, wherein: The separator is provided with an eighth insulating coating layer, the eighth insulating coating layer is opposite to the second blank area, and the eighth insulating coating layer and the third insulating coating layer are located on the same side of the negative electrode current collector.

9. The electrode assembly according to claim 8, characterized in that: The separator is provided with a ninth insulating coating layer, the ninth insulating coating layer is opposite to the second blank area, and the ninth insulating coating layer and the fourth insulating coating layer are located on the same side of the negative electrode current collector.

10. The electrode assembly according to claim 9, characterized in that: An edge of the second region of the negative electrode current collector connected to the negative electrode tab is aligned with an edge of the ninth insulating coating layer.

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