Electrode assembly, battery and electric equipment

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to an electrode assembly, a battery and electric equipment, the electrode assembly comprises a main body part, at least one end face of the main body part is provided with a conductive piece, the main body part is provided with an inner ring layer and an outer ring layer along the winding direction of the main body part, the outer ring layer is located on the outer side of the inner ring layer, and the conductive piece is connected to the outer ring layer and provided with a connecting part protruding out of the end face; the connecting part is used for being connected with a shell, it is effectively ensured that a channel for electrolyte to enter is formed in the middle of the end face of the main body part of the electrode assembly, and the electrolyte can infiltrate the electrode assembly through the channel; besides, a current collecting plate is omitted, so that the material cost can be saved, the production process is simplified, the problem that the electrolyte is possibly prevented from permeating from gaps among the pole pieces to the middle part after the current collecting plate is welded is avoided, the electrolyte injection efficiency and the infiltration efficiency are further improved, and the cycle performance of the battery is optimized.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and specifically relates to an electrode assembly, a battery and an electrical device. Background Art

[0002] As a new type of secondary battery, lithium-ion battery has the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and green environmental protection. It has broad application prospects in portable appliances, power tools, large-scale energy storage, electric transportation power supply, etc.

[0003] At present, cylindrical batteries have become the focus of the energy storage market due to their advantages such as low internal resistance, high energy density, stable structure and high production efficiency. The pole ears of the electrode assemblies of existing cylindrical batteries are flattened or kneaded to form a dense and compact full-ear structure on the end face of the electrode assembly. After welding with the collector plate, this structure makes the collector plate and the full-ear structure fit tightly, thereby preventing the electrolyte from penetrating from the gap between the pole pieces to the middle, resulting in low injection efficiency and pole piece infiltration efficiency, which in turn affects the battery cycle. Utility Model Content

[0004] The purpose of the utility model is to provide an electrode assembly, a battery and an electrical device to address the deficiencies in the prior art, thereby solving the technical problem that the end face of the electrode assembly in the prior art is a dense and compact full-ear structure, and is tightly fitted to the collecting plate after welding, resulting in obstruction of electrolyte penetration, affecting the injection efficiency and the wetting efficiency, and further affecting the cycle performance of the battery.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, the utility model provides an electrode assembly, including a main body portion, at least one end face of the main body portion is provided with a conductive member, along the winding direction of the main body portion, the main body portion has an inner ring layer and an outer ring layer, the outer ring layer is located on the outside of the inner ring layer, the conductive member is connected to the outer ring layer and has a connecting portion protruding from the end face.

[0007] Preferably, the outer layer has a winding number of n, where n is 1-10.

[0008] Preferably, along the winding direction of the main body, a height H of the connecting portion gradually increases from the outer circle layer toward the inner circle layer.

[0009] Preferably, the height H of the connecting portion satisfies the relationship: H n =H1+(n-1)(b+c+2d), 0 n ​is the height of the connecting portion located on the nth outer ring layer, n is the number of winding turns of the outer ring layer, H1 is the height of the connecting portion of the outermost ring of the main body, and a is the distance between the end face and the opening of the shell.

[0010] Preferably, the conductive member located on each of the outer ring layers has at least one connecting portion.

[0011] Preferably, when the conductive member located on each of the outer ring layers has one connecting portion, the connecting portion is arranged corresponding to the outer ring layer.

[0012] Preferably, along the winding direction of the main body, the length L of the connecting portion corresponding to each outer ring layer satisfies the relationship: L n =3.14[D-2(n-1)(b+c+2d)], where L n is the length of the connecting portion located on the outer ring layer of the nth circle, n is the number of winding turns of the outer ring layer, R is the diameter of the main body, b is the thickness of the single-layer positive electrode sheet, c is the thickness of the single-layer negative electrode sheet, and d is the thickness of the single-layer separator.

[0013] Preferably, when the conductive member located on each of the outer ring layers has a plurality of the connecting portions, the plurality of connecting portions are arranged at intervals on the corresponding outer ring layers.

[0014] Preferably, along the winding direction of the main body, the length L of the connecting portion satisfies the relationship: L n ={3.14[D-2(n-1)(b+c+2d)]-mS} / m, where L n is the length of the connecting portion located on the nth outer ring layer, n is the number of winding turns of the outer ring layer, D is the diameter of the main body, b is the thickness of the single-layer positive electrode sheet, c is the thickness of the single-layer negative electrode sheet, d is the thickness of the single-layer separator, S is the interval between two adjacent connecting portions on each outer ring layer, and m is the number of corresponding connecting portions on each outer ring layer.

[0015] Preferably, the main body includes a first pole piece, a second pole piece and a diaphragm that are wound together, the diaphragm is arranged between the first pole piece and the second pole piece, the conductive member is arranged on the first pole piece and / or the second pole piece, and along the height direction of the main body, the connecting portion protrudes from the diaphragm.

[0016] In a second aspect, the utility model provides a battery, comprising a shell, a top cover and the electrode assembly in the above embodiment, wherein the top cover is arranged on the opening of the shell and forms an accommodating space between the top cover and the shell, the electrode assembly is arranged in the accommodating space, and the connecting part is connected to the side wall of the shell.

[0017] In a third aspect, the utility model provides an electrical device, comprising the battery in the above embodiment.

[0018] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0019] The electrode assembly of the utility model is provided with a conductive member on at least one end face of the main body of the electrode assembly, the conductive member is connected to the outer ring layer of the main body, and the conductive member has a connecting portion protruding from the end face of the main body, and the connecting portion is used to connect to the shell, which effectively ensures that a channel for electrolyte inlet is formed in the middle of the end face of the main body of the electrode assembly, and the electrolyte can infiltrate the electrode assembly through the channel, effectively solving the problem of poor infiltration effect caused by the dense and compact full-ear structure of the end face. In addition, the collector plate is eliminated, and the connecting portion is directly connected to the shell, which can not only save material costs and simplify the production process, but also avoid the problem that the collector plate may hinder the electrolyte from penetrating from the gap between the pole pieces to the middle after welding. This improves the injection efficiency and infiltration efficiency of the electrolyte and optimizes the cycle performance of the battery.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 It is a structural schematic diagram of the battery of the utility model.

[0023] Figure 2 It is a structural schematic diagram of the electrode assembly of the utility model.

[0024] Figure 3 This is another schematic diagram of the structure of the battery of the present utility model.

[0025] Figure 4 It is a structural schematic diagram of the first pole piece of the utility model.

[0026] Figure 5 It is a structural schematic diagram of the second pole piece of the utility model.

[0027] Figure 6 This is another structural schematic diagram of the first pole piece of the utility model.

[0028] Figure 7 This is another structural schematic diagram of the second pole piece of the utility model.

[0029] The reference numerals are described as follows:

[0030] 100. Battery;

[0031] 10. electrode assembly; 11. main body; 111. inner ring layer; 112. outer ring layer; 113. end surface; 114. first pole piece; 115. second pole piece; 12. conductive member; 121. connecting part; 122. hollow foil part;

[0032] 20. Shell; 21. First shell; 22. Second shell; 23. Insulator;

[0033] 30. Top cover;

[0034] 40. Pole;

[0035] f. The winding direction of the main body; g. The height direction of the main body. DETAILED DESCRIPTION

[0036] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0037] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0038] In the utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0039] In the utility model, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the utility model generally indicates that the associated objects before and after are in an "or" relationship.

[0040] The following will be combined with the attached Figures 1 to 7 The technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] The electric device of the embodiment of the utility model includes a battery 100. The electric device can be a car, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The car can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or an extended-range car, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. The embodiment of the present application does not impose any special restrictions on the above-mentioned electric devices.

[0042] See also Figures 1-2 The battery 100 of the embodiment of the utility model includes a shell 20, a top cover 30 and an electrode assembly 10. The top cover 30 is covered on the opening of the shell 20 and forms an accommodating space between the top cover 30 and the shell 20. The electrode assembly 10 is arranged in the accommodating space.

[0043] See also Figures 1 to 7 The electrode assembly 10 of the embodiment of the utility model includes a main body 11, and at least one end face 113 of the main body 11 is provided with a conductive member 12. Along the winding direction f of the main body 11, the main body 11 has an inner ring layer 111 and an outer ring layer 112, and the outer ring layer 112 is located on the outside of the inner ring layer 111. The conductive member 12 is connected to the outer ring layer 112 and has a connecting portion 121 protruding from the end face 113.

[0044] Compared with the prior art, the electrode assembly 10 of the embodiment of the utility model is provided with a conductive member 12 on at least one end face 113 of the main body 11 of the electrode assembly 10, the conductive member 12 is connected to the outer ring layer 112 of the main body 11, and the conductive member 12 has a connecting portion 121 protruding from the end face 113 of the main body 11, and the connecting portion 121 is used to connect with the shell 20, which effectively ensures that the electrode assembly 10 is formed with a channel for electrolyte inlet in the middle of the end face 113 of the main body 11, and the electrolyte can infiltrate the electrode assembly 10 through the channel, effectively solving the problem of poor infiltration effect caused by the dense and compact full-ear structure of the end face 113. In addition, the collector plate is eliminated, and the connecting portion 121 is directly connected to the shell 20, which can not only save material costs and simplify the production process, but also avoid the problem that the collector plate may hinder the electrolyte from penetrating from the gap between the pole pieces to the middle after welding. In addition, the injection efficiency and infiltration efficiency of the electrolyte are improved, and the cycle performance of the battery 100 is optimized.

[0045] It is understandable that the connection portion 121 is located on the outer ring layer 112, and during die-cutting, only the portion of the convex portion of the inner ring layer 111 on the end surface 113 needs to be removed by die-cutting, thereby reducing the difficulty of die-cutting.

[0046] It is understandable that the connecting portion 121 is connected to the side wall of the housing 20. Since the conductive member 12 is connected to the outer ring layer 112, the main body 11 forms a channel for electrolyte inlet in the inner ring layer 111. That is, the gap between two adjacent pole pieces. The electrolyte can infiltrate the electrode assembly 10 through the channel, effectively solving the problem of poor infiltration effect due to the dense and compact full-ear structure of the end face 113.

[0047] Specifically, the connection portion 121 is welded to the side wall of the housing 20 or bonded with a conductive adhesive.

[0048] It is understandable that, since the conductive member 12 is connected to the outer ring layer 112, and the connecting portion 121 of the conductive member 12 is connected to the side wall of the housing 20. The overall thickness of the connecting portion 121 should not be too thick or too thin. If the overall thickness of the connecting portion 121 is thick, the connecting portion 121 is prone to problems such as poor welding or poor bonding during the process of connecting the connecting portion 121 to the side wall of the housing 20, making the connection between the connecting portion 121 and the side wall of the housing 20 unstable, causing the connecting portion 121 to fall off easily. If the overall thickness of the connecting portion 121 is thin, the structural emphasis of the connecting portion 121 is poor, and it is more likely to break when subjected to external force or vibration. Therefore, the thickness of the outer ring layer 112 is controlled by adjusting the number of windings of the outer ring layer 112, thereby effectively controlling the overall thickness of the connecting portion 121. Avoiding the overall thickness of the connecting portion 121 being too thick or too thin ensures the connection effect of the connecting portion 121 with the side wall of the housing 20 while ensuring the structural strength of the connecting portion 121.

[0049] In addition, when the number of windings of the electrode assembly 10 is constant, the proportion of the outer layer 112 on the main body 11 can be effectively controlled by adjusting the number of windings of the outer layer 112, thereby ensuring the proportion of the inner layer 111 on the main body 11. It is avoided that the proportion of the inner layer 111 is compressed due to the large proportion of the outer layer 112, thereby ensuring the injection efficiency and infiltration efficiency of the electrolyte.

[0050] In some embodiments, the number of windings of the outer layer 112 is n, and n is 1 to 10. By setting the number of windings of the outer layer 112, when the number of windings of the outer layer 112 is 1 to 10, that is, when n is 1 to 10, it is possible to avoid the overall thickness of the connecting portion 121 being too thick or too thin, ensuring the connection effect between the connecting portion 121 and the side wall of the housing 20, and also ensuring the proportion of the inner layer 111, ensuring the injection efficiency and the infiltration efficiency of the electrolyte.

[0051] Specifically, the number of winding turns of the outer ring layer 112 is 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 or 10 turns, but is not limited to the listed values, and other values ​​within the numerical range are also applicable.

[0052] Preferably, the outer layer 112 has 3 to 10 windings, that is, n is 3 to 10. For example, the outer layer 112 has 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 or 10 windings, but is not limited to the listed values, and other values ​​within the numerical range are also applicable.

[0053] See also Figures 1-2 , Figures 4 to 7 In some embodiments, along the winding direction f of the main body 11, the height H of the connecting portion 121 gradually increases from the outer ring layer 112 to the inner ring layer 111. Since the diameter of the main body 11 gradually decreases from the outer ring layer 112 to the inner ring layer 111, the closer the connecting portion 121 is to the inner ring layer 111, the greater the distance between the connecting portion 121 and the side wall of the housing 20. Therefore, by setting the height H of the connecting portion 121, the height H of the connecting portion 121 is gradually increased from the outer ring layer 112 to the inner ring layer 111, which effectively ensures that the height H of the connecting portion 121 is sufficient, and avoids the inability of the connecting portion 121 to connect to the side wall of the housing 20 due to insufficient height H of the connecting portion 121.

[0054] Furthermore, the height H of the connecting portion 121 satisfies the relationship: n =H1+(n-1)(b+c+2d), 0 n ​is the height of the connecting portion 121 located on the outer layer 112 of the nth circle, n is the number of windings of the outer layer 112, H1 is the height of the connecting portion 121 of the outermost circle of the main body 11, a is the distance between the end face 113 and the opening of the shell 20, b is the thickness of the single-layer positive electrode sheet, c is the thickness of the single-layer negative electrode sheet, and d is the thickness of the single-layer separator. Since the connecting portion 121 needs to be connected to the side wall of the shell 20, the closer the connecting portion 121 is to the inner layer 111, the greater the distance between the connecting portion 121 and the side wall of the shell 20. Therefore, H n =H1+(n-1)(b+c+2d), 0

[0055] See also Figures 1-2 , Figures 4 to 7 In some embodiments, the conductive member 12 on each outer layer 112 has at least one connecting portion 121. This effectively ensures that the conductive member 12 on each outer layer 112 can be connected to the side wall of the housing 20 through the connecting portion 121, thereby ensuring the charge and discharge performance of the electrode assembly 10.

[0056] Specifically, the connection portion 121 includes at least the following configurations:

[0057] The first setting method: Please refer to Figures 4-5 When the conductive member 12 on each outer layer 112 has a connecting portion 121, the connecting portion 121 is arranged corresponding to the outer layer 112. At this time, the length L of the connecting portion 121 is equal to the circumference of the outer layer 112 corresponding thereto, thereby improving the charge and discharge performance of the electrode assembly 10 and reducing the internal resistance.

[0058] Furthermore, along the winding direction f of the main body 11, the length L of the connecting portion 121 corresponding to each of the outer ring layers 112 satisfies the relationship: L n =3.14[D-2(n-1)(b+c+2d)], where L n ​is the length of the connecting portion 121 located on the outer layer 112 of the nth circle, n is the number of windings of the outer layer 112, D is the diameter of the main body 11, b is the thickness of the single-layer positive electrode sheet, c is the thickness of the single-layer negative electrode sheet, and d is the thickness of the single-layer separator. It is effectively ensured that the length L of the connecting portion 121 is equal to the circumference of the corresponding outer layer 112, thereby improving the charge and discharge performance of the electrode assembly 10.

[0059] The second setting method: Please refer to Figures 6-7 When the conductive member 12 on each outer ring layer 112 has a plurality of connecting portions 121, the plurality of connecting portions 121 are arranged at intervals on the corresponding outer ring layer 112. When each outer ring layer 112 is connected to the side wall of the housing 20 through the connecting portion 121, the plurality of connecting portions 121 can provide a plurality of connecting points, which can effectively reduce the difficulty of connecting the connecting portion 121 to the side wall of the housing 20 while ensuring the conductive efficiency of the electrode assembly 10. In addition, in each outer ring layer 112, the plurality of connecting portions 121 are arranged at equal intervals.

[0060] Furthermore, along the winding direction f of the main body 11, the length L of the connecting portion 121 satisfies the relationship: L n ={3.14[D-2(n-1)(b+c+2d)]-mS} / m, where L n is the length of the connecting portion 121 located on the nth circle of the outer layer 112, n is the number of winding turns of the outer layer 112, D is the diameter of the main body 11, b is the thickness of the single-layer positive electrode sheet, c is the thickness of the single-layer negative electrode sheet, d is the thickness of the single-layer separator, S is the interval between two adjacent connecting portions 121 on each of the outer layer 112, and m is the number of corresponding connecting portions 121 on each of the outer layer 112.

[0061] See also Figures 1 to 7In some embodiments, the main body 11 includes a first pole piece 114, a second pole piece 115 and a diaphragm which are wound, the diaphragm is arranged between the first pole piece 114 and the second pole piece 115, and the conductive member 12 is arranged on the first pole piece 114 and / or the second pole piece 115. The polarities of the first pole piece 114 and the second pole piece 115 are opposite, so that the polarities of the conductive member 12 on the first pole piece 114 and the conductive member 12 on the second pole piece 115 are opposite. Therefore, when the conductive member 12 is located on the first pole piece 114 or the second pole piece 115, the conductive member 12 is located at one end of the main body 11; when the conductive member 12 is on both the first pole piece 114 and the second pole piece 115, the conductive member 12 on the first pole piece 114 is located at one end of the main body 11, and the conductive member 12 on the second pole piece 115 is located at the other end of the main body 11, or the conductive member 12 on the second pole piece 115 is located at one end of the main body 11, and the conductive member 12 on the first pole piece 114 is located at the other end of the main body 11. That is, the conductive member 12 is arranged at one end or both ends of the main body 11.

[0062] See also Figures 1-2 When the conductive member 12 is disposed at one end of the main body 11, the other end of the main body 11 is disposed as a full-ear structure, the conductive member 12 and the full-ear structure have opposite polarities, and a pole 40 is penetrated through the bottom wall of the shell 20, and the pole 40 is insulated and connected to the shell 20. After the electrode assembly 10 is placed in the shell, the full-ear structure is disposed toward the bottom wall of the shell 20, and the full-ear structure is connected to the pole 40, and the connecting portion 121 of the conductive member 12 is connected to the side wall of the shell 20.

[0063] See also Figure 3 When the conductive member 12 is disposed at both ends of the main body 11, the polarities of the conductive members 12 at both ends of the main body 11 are opposite, the housing 20 includes a first housing 2120, a second housing 2220 and an insulating member 23, one end of the first housing 2120 and one end of the second housing 2220 are both covered with a top cover 30, the other end of the first housing 2120 and the other end of the second housing 2220 are connected through the insulating member 23, the connecting portion 121 of the conductive member 12 at one end of the main body 11 is connected to the side wall of the first housing 2120, and the connecting portion 121 of the conductive member 12 at the other end of the main body 11 is connected to the side wall of the second housing 2220. Since the first housing 2120 and the second housing 2220 are insulated by the insulating member 23, the electrode assembly 10 is effectively prevented from short-circuiting.

[0064] Further, along the height direction g of the main body 11, the edge of the diaphragm protrudes from the first pole piece 114 and the second pole piece 115, and the connecting portion 121 protrudes from the diaphragm. By protruding the edge of the diaphragm from the first pole piece 114 and the second pole piece 115, it is effectively avoided that the first pole piece 114 and the second pole piece 115 contact and cause a short circuit of the electrode assembly 10. By protruding the connecting portion 121 from the diaphragm, it is effectively avoided that the diaphragm hinders the connection between the connecting portion 121 and the side wall of the housing 20.

[0065] See also Figure 2 , Figures 4 to 7 Further, the conductive member 12 has a hollow foil portion 122, the hollow foil portion 122 is arranged on one side of the first pole piece 114 and / or one side of the second pole piece 115, the hollow foil portion 122 is flush with the edge of the diaphragm on the same side, and the connecting portion 121 is connected to the hollow foil portion 122 located on the outer ring layer 112. Through the arrangement of the hollow foil portion 122, the hollow foil portion 122 is flush with the edge of the diaphragm on the same side, which effectively enhances the strength of the portion of the diaphragm that exceeds the end surface 113 of the main body 11, and prevents the diaphragm from being damaged in the material area due to excessive extrusion in a vibrating working environment.

[0066] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. An electrode assembly, characterized in that: The invention comprises a main body (11), at least one end face (113) of the main body (11) being provided with a conductive member (12), along the winding direction (f) of the main body (11), the main body (11) having an inner ring layer (111) and an outer ring layer (112), the outer ring layer (112) being located outside the inner ring layer (111), the conductive member (12) being connected to the outer ring layer (112) and having a connecting portion (121) protruding from the end face (113).

2. The electrode assembly according to claim 1, characterized in that: The outer ring layer (112) has a winding number of n, where n is 1 to 10.

3. The electrode assembly according to claim 1, characterized in that: Along the winding direction (f) of the main body (11), the height H of the connecting portion (121) gradually increases from the outer circle layer (112) toward the inner circle layer (111).

4. The electrode assembly according to claim 3, characterized in that: The height H of the connecting portion (121) satisfies the relationship: n =H1+(n-1)(b+c+2d), 0 n is the height of the connecting portion (121) located on the nth circle of the outer ring layer (112), n is the number of winding turns of the outer ring layer (112), H1 is the height of the connecting portion (121) of the outermost circle of the main body (11), and a is the distance between the end face (113) and the opening of the shell (20).​ 5. The electrode assembly according to claim 1, characterized in that: The conductive member (12) located on each of the outer ring layers (112) has at least one connecting portion (121).

6. The electrode assembly according to claim 5, characterized in that: When the conductive member (12) located on each of the outer ring layers (112) has one connecting portion (121), the connecting portion (121) is arranged corresponding to the outer ring layer (112).

7. The electrode assembly according to claim 6, characterized in that: Along the winding direction (f) of the main body (11), the length L of the connecting portion (121) corresponding to each outer ring layer (112) satisfies the relationship: L n =3.14[D-2(n-1)(b+c+2d)], where L n is the length of the connecting portion (121) located on the nth outer layer (112), n is the number of windings of the outer layer (112), D is the diameter of the main body (11), b is the thickness of a single-layer positive electrode sheet, c is the thickness of a single-layer negative electrode sheet, and d is the thickness of a single-layer separator.

8. The electrode assembly according to claim 5, characterized in that: When the conductive member (12) located on each of the outer ring layers (112) has a plurality of connecting portions (121), the plurality of connecting portions (121) are arranged at intervals on the corresponding outer ring layers (112).

9. The electrode assembly according to claim 8, characterized in that: Along the winding direction (f) of the main body (11), the length L of the connecting portion (121) satisfies the relationship: L n ={3.14[D-2(n-1)(b+c+2d)]-mS} / m, where L n is the length of the connecting portion (121) located on the nth outer layer (112), n is the number of windings of the outer layer (112), D is the diameter of the main body (11), b is the thickness of a single-layer positive electrode sheet, c is the thickness of a single-layer negative electrode sheet, d is the thickness of a single-layer separator, S is the interval between two adjacent connecting portions (121) on each outer layer (112), and m is the number of corresponding connecting portions (121) on each outer layer (112).

10. The electrode assembly according to claim 1, characterized in that: The main body (11) comprises a first pole piece (114), a second pole piece (115) and a diaphragm which are wound together; the diaphragm is arranged between the first pole piece (114) and the second pole piece (115); the conductive member (12) is arranged on the first pole piece (114) and / or the second pole piece (115); and along the height direction (g) of the main body (11), the connecting portion (121) protrudes from the diaphragm.

11. A battery, characterized in that: It comprises a shell (20), a top cover (30) and an electrode assembly according to any one of claims 1 to 10, wherein the top cover (30) is arranged on the opening of the shell (20) and forms an accommodation space between the top cover (30) and the shell (20), the electrode assembly (10) is arranged in the accommodation space, and the connecting portion (121) is connected to the side wall of the shell (20).

12. An electrical equipment, characterized in that: Comprising the battery of claim 11.

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