Aqueous zinc ion battery

Abstract

The utility model belongs to the technical field of batteries, and particularly discloses an aqueous zinc ion battery which comprises a shell and a battery cell arranged in the shell, the battery cell comprises a positive electrode structure, a negative electrode structure, a diaphragm structure and ZnCl2 / ZnSO4 composite electrolyte, the diaphragm structure is arranged between the positive electrode structure and the negative electrode structure, and the ZnCl2 / ZnSO4 composite electrolyte is arranged in the shell. And the ZnCl2 / ZnSO4 composite electrolyte is poured between the positive electrode structure and the negative electrode structure. According to the aqueous zinc ion battery provided by the utility model, the positive electrode structure consists of the positive electrode current collector and the positive electrode active material layer, the positive electrode active material layer is in close contact with the positive electrode current collector, and the connecting bulge serves as a connecting framework of the positive electrode current collector and the positive electrode active material layer, so that active materials can be effectively prevented from falling off from the positive electrode current collector, and the stability of the positive electrode structure is improved; the negative electrode structure is composed of the conductive polymer coating and the negative electrode active material layer, the conductive polymer coating is beneficial to uniform deposition of zinc ions, and formation of zinc dendrites can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an aqueous zinc ion battery. Background Art

[0002] Lithium-ion batteries, as the core energy storage technology in the current new energy sector, dominate consumer electronics, electric vehicles, and large-scale energy storage systems. However, as market demands for battery energy density, cycle life, and safety performance continue to increase, the limitations of traditional lithium-ion batteries are becoming increasingly prominent. The core issue is that most lithium-ion batteries use organic electrolytes such as carbonates and ethers. These substances are flammable and have poor thermal stability. When the battery experiences thermal runaway, overcharge, or mechanical damage, it is very likely to cause electrolyte leakage, combustion, or even explosion, posing a serious threat to the safety of users and property. Therefore, the development of intrinsically safe next-generation battery technology has become an urgent issue for the industry.

[0003] Against this backdrop, zinc-ion batteries (especially aqueous zinc-ion batteries) have garnered widespread attention due to their unique advantages. Zinc, a plentiful metallic element in the Earth's crust, is both cost-effective and a sustainable resource. Furthermore, the aqueous electrolyte system fundamentally eliminates the risk of explosion associated with organic electrolytes, significantly enhancing the battery's intrinsic safety. Furthermore, zinc-ion batteries offer advantages such as environmental friendliness (no toxic precipitation) and a high theoretical capacity, making them a promising alternative to lithium-ion batteries.

[0004] However, existing zinc-ion battery technology still faces several key technical bottlenecks, which restrict its development progress:

[0005] One is the poor stability of the positive electrode active material: during the charge and discharge cycle, the positive electrode active material is prone to volume changes, which leads to a decrease in the binding force with the current collector, and eventually causes the active material to fall off, resulting in rapid decay of the battery capacity.

[0006] Second, uncontrolled zinc dendrite growth at the negative electrode: Uneven zinc deposition or side reactions can lead to uneven electroplating at the negative electrode, resulting in disordered zinc dendrite growth. Once a dendrite pierces the separator, it can directly short-circuit the positive and negative electrodes, causing localized overheating and even thermal runaway, a key safety hazard for batteries.

[0007] In summary, zinc ion batteries in the prior art have the problems of poor stability of the positive electrode active material and uncontrolled growth of negative electrode zinc dendrites. Utility Model Content

[0008] The utility model provides an aqueous zinc ion battery, which can solve the problems of poor stability of positive electrode active materials and uncontrolled growth of negative electrode zinc dendrites in zinc ion batteries in the prior art.

[0009] An aqueous zinc ion battery comprises a housing and a battery cell disposed within the housing, wherein the battery cell comprises a positive electrode structure, a negative electrode structure, a diaphragm structure, and a ZnCl2 / ZnSO4 composite electrolyte, wherein the diaphragm structure is disposed between the positive electrode structure and the negative electrode structure, and the ZnCl2 / ZnSO4 composite electrolyte is perfused between the positive electrode structure and the negative electrode structure;

[0010] The positive electrode structure includes a positive electrode current collector and a positive electrode active material layer, wherein a side of the positive electrode current collector facing the diaphragm structure is provided with a plurality of connection protrusions, and the positive electrode active material layer is coated on the side of the positive electrode current collector provided with the connection protrusions;

[0011] The negative electrode structure includes a negative electrode active material layer and a conductive polymer coating, wherein the conductive polymer coating is coated on a side of the negative electrode active material layer facing the separator structure;

[0012] The diaphragm structure includes a diaphragm polymer coating and a diaphragm skeleton, and the diaphragm skeleton is arranged on a side of the diaphragm polymer coating facing the positive electrode structure.

[0013] Furthermore, the shape of the connecting protrusion is truncated cone, T-shaped or hourglass-shaped.

[0014] Furthermore, a plurality of communication channels are provided on the surface of the diaphragm skeleton.

[0015] Furthermore, the inner diameter of the communicating channel is 300-800 nm.

[0016] Furthermore, the thickness of the diaphragm skeleton is 10-40 μm;

[0017] The thickness of the membrane polymer coating is 60-200 nm.

[0018] According to an aqueous zinc ion battery provided by the utility model, the diaphragm structure is composed of a diaphragm skeleton and a diaphragm polymer coating. By providing a plurality of connecting channels on the surface of the diaphragm skeleton, it is beneficial to the uniform transport of zinc ions. At the same time, the diaphragm polymer coating provides a certain mechanical strength, effectively prevents the formation of zinc dendrites, and protects the integrity of the diaphragm skeleton, thereby improving the rate performance and cycle stability of the zinc ion battery.

[0019] Furthermore, the housing includes a positive electrode shell and a negative electrode shell that are arranged opposite to each other, and an inner cavity for accommodating the battery cell is formed between the positive electrode shell and the negative electrode shell.

[0020] Furthermore, a mounting groove is provided on an edge of a side surface of the positive electrode housing close to the negative electrode housing, and a mounting protrusion is provided on the negative electrode housing at a position corresponding to the mounting groove, and the mounting protrusion cooperates with the mounting groove.

[0021] Furthermore, the inner surface of the installation groove is also provided with a plastic inner layer.

[0022] According to an aqueous zinc ion battery provided by the utility model, a mounting groove is provided on the positive electrode shell, and a mounting protrusion that matches the mounting groove is provided on the negative electrode shell, that is, the positive electrode shell and the negative electrode shell have a concave-convex structure that can overlap, and a plastic inner layer is provided in the mounting groove of the negative electrode shell. When pressed together with the negative electrode shell, a structure similar to an "expansion screw" is formed to achieve sealing between the positive electrode shell and the negative electrode shell and stability of the connection structure.

[0023] Furthermore, the positive electrode active material layer continuously covers the side of the positive electrode current collector provided with the connecting protrusions, and the positive electrode active material layer completely covers a plurality of the connecting protrusions.

[0024] Furthermore, a spring is provided on a side of the negative electrode active material layer away from the conductive polymer coating.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. The utility model provides an aqueous zinc ion battery, wherein the positive electrode structure consists of a positive electrode current collector and a positive electrode active material layer. The positive electrode current collector has a plurality of connecting protrusions, and channels are formed between adjacent connecting protrusions. When the positive electrode active material is embedded in the channels by coating, a positive electrode active material layer is formed. The positive electrode active material layer is in close contact with the positive electrode current collector, and the connecting protrusions serve as a connecting skeleton between the two, which can effectively prevent the active material from falling off from the positive electrode current collector, thereby increasing the stability of the positive electrode structure.

[0027] 2. The utility model provides an aqueous zinc ion battery, in which the negative electrode structure is composed of a conductive polymer coating and a negative electrode active material layer. The conductive polymer coating is conducive to the uniform deposition of zinc ions, which can effectively reduce the formation of zinc dendrites, and avoid the dendrites piercing the diaphragm due to uncontrolled growth of negative electrode zinc dendrites, causing short circuits between the positive and negative electrodes, and triggering local overheating or even thermal runaway. At the same time, due to the provision of the conductive polymer coating, it has closer physical contact with the diaphragm structure, reducing the interface impedance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 A schematic structural diagram of an aqueous zinc ion battery provided by the present invention;

[0030] Figure 2This is an exploded diagram of the structure of an aqueous zinc ion battery provided by the utility model;

[0031] Figure 3 This is an exploded view of the structure of the shell of an aqueous zinc ion battery provided by the utility model;

[0032] Figure 4 A schematic structural diagram of a shell of an aqueous zinc ion battery provided by the utility model;

[0033] Figure 5 This is a schematic diagram of the structure of Example 2 provided by the present utility model;

[0034] Figure 6 This is a schematic diagram of the structure of Example 3 provided by the present utility model;

[0035] Figure 7 This is a schematic structural diagram of Example 4 provided by the present utility model.

[0036] Explanation of the accompanying drawings: 1. positive electrode current collector; 2. positive electrode active material layer; 3. diaphragm polymer coating; 4. diaphragm skeleton; 5. conductive polymer coating; 6. negative electrode active material layer; 7. spring; 8. negative electrode shell; 9. positive electrode shell; 11. outer shell; 12. positive electrode structure; 13. negative electrode structure; 14. diaphragm structure; 100. inner cavity; 101. connecting protrusion; 102. first connecting section; 103. second connecting section; 104. connecting hourglass piece; 111. mounting groove; 112. plastic inner layer; 401. connecting channel; 801. mounting protrusion. DETAILED DESCRIPTION

[0037] The specific implementation methods of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific implementation methods.

[0038] Lithium-ion batteries, as the core energy storage technology in the current new energy sector, dominate consumer electronics, electric vehicles, and large-scale energy storage systems. However, as market demands for battery energy density, cycle life, and safety performance continue to increase, the limitations of traditional lithium-ion batteries are becoming increasingly prominent. The core issue is that most lithium-ion batteries use organic electrolytes such as carbonates and ethers. These substances are flammable and have poor thermal stability. When the battery experiences thermal runaway, overcharge, or mechanical damage, it is very likely to cause electrolyte leakage, combustion, or even explosion, posing a serious threat to the safety of users and property. Therefore, the development of intrinsically safe next-generation battery technology has become an urgent issue for the industry.

[0039] Against this backdrop, zinc-ion batteries (especially aqueous zinc-ion batteries) have garnered widespread attention due to their unique advantages. Zinc, a plentiful metallic element in the Earth's crust, is both cost-effective and a sustainable resource. Furthermore, the aqueous electrolyte system fundamentally eliminates the risk of explosion associated with organic electrolytes, significantly enhancing the battery's intrinsic safety. Furthermore, zinc-ion batteries offer advantages such as environmental friendliness (no toxic precipitation) and a high theoretical capacity, making them a promising alternative to lithium-ion batteries.

[0040] However, existing zinc-ion battery technology still faces several key technical bottlenecks, which restrict its development progress:

[0041] One is the poor stability of the positive electrode active material: during the charge and discharge cycle, the positive electrode active material is prone to volume changes, which leads to a decrease in the binding force with the current collector, and eventually causes the active material to fall off, resulting in rapid decay of the battery capacity.

[0042] Second, uncontrolled zinc dendrite growth at the negative electrode: Uneven zinc deposition or side reactions can lead to uneven electroplating at the negative electrode, resulting in disordered zinc dendrite growth. Once a dendrite pierces the separator, it can directly short-circuit the positive and negative electrodes, causing localized overheating and even thermal runaway, a key safety hazard for batteries.

[0043] The third is insufficient shell sealing design: zinc metal has high chemical activity. If the battery shell sealing performance is poor, the zinc negative electrode will easily react with moisture and oxygen in the air (such as generating Zn(OH)2 or H2), which will not only cause the electrolyte to fail, but also cause the battery to swell due to gas production, further exacerbating safety hazards.

[0044] In summary, zinc ion batteries in the prior art have problems such as poor stability of the positive electrode active material, uncontrolled growth of negative electrode zinc dendrites, and insufficient shell sealing design.

[0045] Example 1

[0046] like Figures 1 to 4 As shown, this embodiment provides an aqueous zinc ion battery, including a housing 11 and a battery cell disposed in the housing 11, the battery cell including a positive electrode structure 12, a negative electrode structure 13, a diaphragm structure 14 and a ZnCl2 / ZnSO4 composite electrolyte;

[0047] The diaphragm structure 14 , i.e., the diaphragm, is disposed between the positive electrode structure 12 and the negative electrode structure 13 ;

[0048] The ZnCl2 / ZnSO4 composite electrolyte is poured between the positive electrode structure 12 and the negative electrode structure 13;

[0049] The positive electrode structure 12 includes a positive electrode current collector 1 and a positive electrode active material layer 2. The positive electrode current collector 1 has a plurality of connection protrusions 101 on one side facing the diaphragm structure 14. The positive electrode active material layer 2 is coated on the side of the positive electrode current collector 1 having the connection protrusions 101.

[0050] Specifically, one side of the positive electrode current collector 1 faces the inner wall of the housing 11, and the other side of the positive electrode current collector 1 (i.e., the side of the positive electrode current collector 1 facing the diaphragm structure 14) is integrally formed with a plurality of connecting protrusions 101, and the positive electrode active material layer 2 is coated on the side of the positive electrode current collector 1 provided with the connecting protrusions 101. The connecting protrusions 101 are integrally formed on the positive electrode current collector 1, avoiding the addition of additional adhesives or complex surface treatment processes, simplifying its production process, and making the structure more reliable.

[0051] More specifically, the positive electrode active material layer 2 continuously covers the side of the positive electrode current collector 1 where the connection protrusions 101 are provided, and completely covers all the connection protrusions 101; the continuously coated active material layer naturally fills and covers the connection protrusions 101, and has good process compatibility;

[0052] In the positive electrode structure 12, the positive electrode structure 12 is composed of a positive electrode current collector 1 and a positive electrode active material layer 2. The positive electrode current collector 1 has a plurality of connecting protrusions 101. Pores are formed between adjacent connecting protrusions 101. When the positive electrode active material is embedded in the pores by coating, the positive electrode active material layer 2 is formed. The positive electrode active material layer 2 is in close contact with the positive electrode current collector 1. The connecting protrusions 101 serve as a connecting skeleton between the two, which can effectively prevent the positive electrode active material layer 2 from falling off from the positive electrode current collector 1, thereby increasing the stability of the positive electrode structure 12.

[0053] The negative electrode structure 13 includes a negative electrode active material layer 6 and a conductive polymer coating 5. The conductive polymer coating 5 is coated on a side of the negative electrode active material layer 6 facing the separator structure 14. A spring 7 is provided on a side of the negative electrode active material layer 6 away from the conductive polymer coating 5.

[0054] Specifically, a conductive polymer coating 5 is coated on one side of the negative electrode active material layer 6 (i.e., the side of the negative electrode active material layer 6 facing the diaphragm structure 14), and a spring 7 is provided on the other side of the negative electrode active material layer 6. The spring 7 can create a certain amount of stress between the positive electrode structure 12, the negative electrode structure 13, and the diaphragm structure 14, ensuring close contact between the three, which is conducive to uniform zinc ion insertion and extraction.

[0055] More specifically, the conductive polymer coating 5 is evenly coated on the side of the negative electrode active material layer 6 facing the diaphragm structure 14; the side of the elastic piece 7 away from the negative electrode active material layer 6 faces the inner wall of the shell 11;

[0056] The negative electrode structure 13 is composed of a conductive polymer coating 5 and a negative electrode active material layer 6. The conductive polymer coating 5 is conducive to the uniform deposition of zinc ions, which can effectively reduce the formation of zinc dendrites, and prevent the uncontrolled growth of negative zinc dendrites, which may cause dendrites to pierce the diaphragm, causing a short circuit between the positive and negative electrodes, and causing local overheating or even thermal runaway. At the same time, due to the provision of the conductive polymer coating 5, it has a closer physical contact with the diaphragm structure 14, reducing the interface impedance.

[0057] The diaphragm structure 14 includes a diaphragm polymer coating 3 and a diaphragm skeleton 4. The diaphragm skeleton 4 is provided on a side of the diaphragm polymer coating 3 facing the positive electrode structure 12.

[0058] Specifically, the diaphragm structure 14 is arranged between the positive electrode structure 12 and the negative electrode structure 13; the diaphragm skeleton 4 is arranged toward the positive electrode structure 12, and the diaphragm polymer coating 3 is arranged toward the negative electrode structure 13; the diaphragm polymer coating 3 provides a certain mechanical strength, which can further effectively prevent the formation of zinc dendrites and protect the integrity of the diaphragm skeleton 4, thereby improving the rate performance and cycle stability of the zinc ion battery.

[0059] Example 2

[0060] like Figure 5 As shown, this embodiment provides an aqueous zinc ion battery, which is different from Example 1 in that, in this embodiment, the shape of the connecting protrusion 101 is a truncated cone;

[0061] When the shape of the connecting protrusion 101 is truncated cone-shaped, the two bottom surfaces of the truncated cone-shaped connecting protrusion 101 are marked, the bottom surface with a larger area is marked as the first bottom surface, and the bottom surface with a smaller area is marked as the second bottom surface. The first bottom surface of the connecting protrusion 101 is arranged toward the separator polymer coating 3, and the second bottom surface of the connecting protrusion 101 is arranged on the positive electrode current collector 1. Based on the above arrangement, a trapezoidal channel is formed between two adjacent connecting protrusions 101.

[0062] Since the positive electrode active material layer 2 continuously covers the side of the positive electrode current collector 1 on which the connecting protrusions 101 are provided, and completely covers all the connecting protrusions 101, that is, after the positive electrode active material layer 2 is coated on the positive electrode current collector 1, the positive electrode active material layer 2 can be embedded in the trapezoidal channel formed by two adjacent connecting protrusions 101, forming a strong mechanical interlocking structure. While ensuring close contact between the positive electrode active material layer 2 and the positive electrode current collector 1, the trapezoidal filling structure can effectively prevent the active material of the positive electrode active material layer 2 from falling off the positive electrode current collector 1, thereby increasing the stability of the positive electrode structure 12;

[0063] Specifically, during the battery cycle, this structure can effectively resist the shear force of the positive electrode active material layer 2 parallel to the surface of the positive electrode current collector 1, as well as the peeling force perpendicular to the surface of the positive electrode current collector 1, greatly reducing the risk of the active material peeling or falling off from the current collector.

[0064] Example 3

[0065] like Figure 6 As shown, this embodiment provides an aqueous zinc ion battery, which is different from Example 1 and Example 2 in that, in this embodiment, the shape of the connecting protrusion 101 is T-shaped;

[0066] When the connecting protrusion 101 is T-shaped, the T-shaped connecting protrusion 101 includes a first connecting segment 102 and a second connecting segment 103, and the first connecting segment 102 and the second connecting segment 103 are perpendicular to each other; specifically, one end of the first connecting segment 102 is connected to the second connecting segment 103, and the other end of the first connecting segment 102 is connected to the positive electrode current collector 1;

[0067] Since the positive electrode active material layer 2 continuously covers the side of the positive electrode current collector 1 on which the connecting protrusion 101 is provided, and completely covers all the connecting protrusions 101, that is, after the positive electrode active material layer 2 is covered on the positive electrode current collector 1, the positive electrode active material layer 2 can be completely covered on the outside of the T-shaped connecting protrusion 101, thereby forming a firm locking structure, effectively preventing the positive electrode active material layer 2 from falling off from the positive electrode current collector 1, and enhancing the stability of the positive electrode structure 12.

[0068] Example 4

[0069] like Figure 7 As shown, this embodiment provides an aqueous zinc ion battery, which is different from Example 1, Example 2, and Example 3 in that, in this embodiment, the shape of the connecting protrusion 101 is hourglass-shaped;

[0070] The shape of the connecting protrusion 101 is hourglass-shaped, and the hourglass-shaped connecting protrusion 101 includes two integrally formed connecting hourglass parts 104, and the two connecting hourglass parts 104 are arranged opposite to each other; using the hourglass-shaped connecting protrusion 101, when the positive electrode active material layer 2 is covered on the positive electrode current collector 1, the positive electrode active material layer 2 can be completely covered on the outside of the hourglass-shaped connecting protrusion 101, thereby forming a firm locking structure, effectively preventing the positive electrode active material layer 2 from falling off from the positive electrode current collector 1, and enhancing the stability of the positive electrode structure 12.

[0071] Example 5

[0072] like Figures 1 to 4 As shown, this embodiment provides an aqueous zinc ion battery. The difference from Example 1 is that in this embodiment, a plurality of connecting channels 401 are provided on the surface of the diaphragm skeleton 4;

[0073] The inner diameter of the communication channel 401 is 300-800 nm;

[0074] Since the diaphragm structure 14 includes a diaphragm polymer coating 3 and a diaphragm skeleton 4, the diaphragm skeleton 4 is arranged on a side of the diaphragm polymer coating 3 facing the positive electrode structure 12; therefore, a connecting channel 401 is provided on the diaphragm skeleton 4, so that the diaphragm structure 14 is conducive to the uniform transport of zinc ions.

[0075] Example 6

[0076] like Figures 1 to 4 As shown, this embodiment provides an aqueous zinc ion battery, which is different from Example 1 in that, in this embodiment, the thickness of the diaphragm skeleton 4 is 10-40 μm;

[0077] The thickness of the membrane polymer coating 3 is 60-200 nm;

[0078] Specifically, the thickness of the diaphragm skeleton 4 is preferably 20 μm, and the thickness of the diaphragm polymer coating 3 is preferably 100 nm;

[0079] The separator polymer coating 3, that is, a polymer coating, can be in close contact with the conductive polymer coating 5 on the negative electrode structure 13, thereby reducing interface impedance.

[0080] Example 7

[0081] like Figures 1 to 4 As shown, this embodiment provides an aqueous zinc ion battery. The difference from Example 1 is that in this embodiment, the housing 11 includes a positive electrode shell 9 and a negative electrode shell 8 arranged opposite to each other, and an inner cavity 100 for accommodating the battery cell is formed between the positive electrode shell 9 and the negative electrode shell 8; and the positive electrode shell 9 and the negative electrode shell 8 are sealed and assembled on the left and right sides;

[0082] A mounting groove 111 is provided on the edge of the positive electrode housing 9 on one side close to the negative electrode housing 8. A mounting protrusion 801 is provided on the negative electrode housing 8 at a position corresponding to the mounting groove 111. The mounting protrusion 801 cooperates with the mounting groove 111.

[0083] The inner surface of the mounting groove 111 is further provided with a plastic inner layer 112;

[0084] Specifically, a concave-convex structure is provided at the connection between the positive electrode housing 9 and the negative electrode housing 8, that is, the mounting protrusion 801 integrally formed on the negative electrode housing 8 cooperates with the mounting groove 111 on the positive electrode housing 9, so that the positive electrode housing 9 and the negative electrode housing 8 can be assembled quickly, thereby improving their assembly efficiency;

[0085] In addition, since a plastic inner layer 112 is provided on the inner surface of the mounting groove 111, when the positive electrode housing 9 and the negative electrode housing 8 are pressed together, the mounting protrusion 801 on the negative electrode housing 8 is pressed into the mounting groove 111 on the positive electrode housing 9. Due to the provision of the plastic inner layer 112, while further improving the sealing of the outer shell 11 after pressing, a structure similar to an "expansion screw" can be formed, further improving the structural stability of the outer shell 11.

[0086] The utility model provides an aqueous zinc ion battery, wherein the positive electrode structure 12 is composed of a positive electrode current collector 1 and a positive electrode active material layer 2, the positive electrode current collector 1 has a plurality of connecting protrusions 101, and channels are formed between adjacent connecting protrusions 101. When the positive electrode active material is embedded in the channel by coating, the positive electrode active material layer 2 is formed. The positive electrode active material layer 2 is in close contact with the positive electrode current collector 1, and the connecting protrusions 101 serve as a connecting skeleton between the two, which can effectively prevent the active material from falling off from the positive electrode current collector 1, thereby increasing the stability of the positive electrode structure 12; in addition, the negative electrode structure 13 is composed of a conductive polymer coating 5 and a negative electrode active material layer 6, the conductive polymer coating 5 is conducive to the uniform deposition of zinc ions, and can effectively reduce the formation of zinc dendrites, avoid the dendrites piercing the diaphragm due to the uncontrolled growth of negative electrode zinc dendrites, causing short circuits between the positive and negative electrodes, and triggering local overheating or even thermal runaway problems; at the same time, due to the provision of the conductive polymer coating 6, its physical contact with the diaphragm structure 14 is closer, reducing the interface impedance.

[0087] The above disclosures are only a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

[0088] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model 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 the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0089] In the description of the present utility model, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0090] It should also be noted that, in the description of this utility model, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

Claims

1. An aqueous zinc ion battery, characterized in that The invention comprises a housing (11) and a battery cell arranged in the housing (11), wherein the battery cell comprises a positive electrode structure (12), a negative electrode structure (13), a diaphragm structure (14), and a ZnCl2 / ZnSO4 composite electrolyte, wherein the diaphragm structure (14) is arranged between the positive electrode structure (12) and the negative electrode structure (13), and the ZnCl2 / ZnSO4 composite electrolyte is poured between the positive electrode structure (12) and the negative electrode structure (13); The positive electrode structure (12) comprises a positive electrode current collector (1) and a positive electrode active material layer (2); a side of the positive electrode current collector (1) facing the diaphragm structure (14) is provided with a plurality of connection protrusions (101); and the positive electrode active material layer (2) is coated on the side of the positive electrode current collector (1) provided with the connection protrusions (101); The negative electrode structure (13) comprises a negative electrode active material layer (6) and a conductive polymer coating (5), wherein the conductive polymer coating (5) is coated on a side of the negative electrode active material layer (6) facing the separator structure (14); The diaphragm structure (14) comprises a diaphragm polymer coating (3) and a diaphragm skeleton (4), wherein the diaphragm skeleton (4) is arranged on a side of the diaphragm polymer coating (3) facing the positive electrode structure (12).

2. An aqueous zinc ion battery according to claim 1, characterized in that, The shape of the connecting protrusion (101) is a truncated cone, a T-shape or an hourglass shape.

3. An aqueous zinc ion battery according to claim 1, characterized in that: The surface of the diaphragm skeleton (4) is provided with a plurality of communicating channels (401).

4. An aqueous zinc ion battery according to claim 3, characterized in that: The inner diameter of the communicating channel (401) is 300-800 nm.

5. An aqueous zinc ion battery according to claim 1, characterized in that: The thickness of the diaphragm skeleton (4) is 10-40 μm; The thickness of the membrane polymer coating (3) is 60-200 nm.

6. An aqueous zinc ion battery according to claim 1, characterized in that: The housing (11) comprises a positive electrode shell (9) and a negative electrode shell (8) arranged opposite to each other, and an inner cavity (100) for accommodating the battery cell is formed between the positive electrode shell (9) and the negative electrode shell (8).

7. An aqueous zinc ion battery according to claim 6, characterized in that: The edge of the positive electrode housing (9) on one side close to the negative electrode housing (8) is provided with a mounting groove (111), and a mounting protrusion (801) is provided on the negative electrode housing (8) at a position corresponding to the mounting groove (111), and the mounting protrusion (801) cooperates with the mounting groove (111).

8. An aqueous zinc ion battery according to claim 7, characterized in that: The inner surface of the installation groove (111) is further provided with a plastic inner layer (112).

9. An aqueous zinc ion battery according to claim 1, characterized in that: The positive electrode active material layer (2) continuously covers a side of the positive electrode current collector (1) provided with a connection protrusion (101), and the positive electrode active material layer (2) completely covers a plurality of the connection protrusions (101).

10. The aqueous zinc ion battery according to claim 1, characterized in that: A spring (7) is provided on a side of the negative electrode active material layer (6) away from the conductive polymer coating (5).

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