Sodium ion monolithic half cell

Abstract

The utility model relates to a sodium ion monolithic half cell, which belongs to the technical field of sodium ion cells and is used for solving at least one of the problems that a sodium ion monolithic cell with a specific structure is not disclosed in the prior art, commercial production is not formed and the like. A sodium ion monolithic half cell comprises a diaphragm bag, a sodium ion cell pole piece and a metal sodium counter electrode, the sodium ion cell pole piece is located in a cavity of the diaphragm bag, the metal sodium counter electrode is attached to the outer portion of the diaphragm bag, and the metal sodium counter electrode is formed by bonding sodium foil and aluminum foil conductive adhesive. The aluminum foil conductive adhesive is used as a metal sodium current collector and is bonded with the metal sodium foil to serve as a metal sodium counter electrode, so that the operation convenience of the sodium-ion monolithic half cell is improved, the preparation method is simple, the manufacturing speed of the sodium-ion monolithic half cell is improved, the commercial aluminum foil conductive adhesive is purchased, the subsequent disassembly is convenient, and the attaching process is simple; the monolithic half cell prepared by the utility model is high in yield and safety.

Description

Technical Field

[0001] The utility model relates to the technical field of sodium ion batteries, in particular to a sodium ion monolithic half-battery. Background Art

[0002] Lithium-ion batteries have been widely used in new energy vehicles, energy storage and other fields. Due to the limited material resources and rising prices of lithium-ion batteries, the sustainable development of lithium-ion battery shells is subject to certain restrictions. Relatively speaking, sodium-ion batteries have a similar working principle to lithium-ion batteries, and sodium ion resources are widely distributed, low in cost, and have good safety performance, and are expected to be widely used.

[0003] With the rapid development of sodium-ion batteries, the pace of product launch has accelerated, and the number of product failure points has gradually increased. The failure analysis method used for sodium-ion batteries is usually to disassemble the failed batteries of the product and assemble them into single-chip batteries for failure point analysis. This method is aimed at the capacity attenuation analysis of the finished battery and cannot distinguish the structural loss of the positive and negative electrode materials inside the battery. Summary of the invention

[0004] In view of the above analysis, the utility model aims to provide a sodium ion monolithic half-cell to solve the problem that the capacity attenuation analysis of the existing monolithic battery for the finished battery cannot distinguish the loss of the positive and negative electrode material structure inside the battery.

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

[0006] A sodium ion monolithic half-cell comprises a diaphragm bag, a sodium ion battery pole piece and a metallic sodium counter electrode, wherein the sodium ion battery pole piece is located in the cavity of the diaphragm bag, the metallic sodium counter electrode is attached to the outside of the diaphragm bag, and the metallic sodium counter electrode is formed by bonding sodium foil and aluminum foil with conductive adhesive.

[0007] Furthermore, the thickness of the sodium foil is 10-13 μm.

[0008] Furthermore, the aluminum foil conductive adhesive comprises an integrally formed aluminum foil conductive adhesive body and a first electrode tab.

[0009] Furthermore, the length of the first electrode tab is 1 to 2 cm, and the width of the first electrode tab is 0.5 to 1 cm.

[0010] Furthermore, the sodium foil and the aluminum foil conductive adhesive have the same shape and size.

[0011] Furthermore, the length of the sodium foil or the aluminum foil conductive adhesive body is 5 to 6 cm, and the width is 4 to 5 cm.

[0012] Furthermore, an opening is provided at the upper end of the diaphragm bag, and the sodium ion battery electrode is placed in the cavity of the diaphragm bag through the opening.

[0013] Furthermore, one side of the sodium ion battery pole piece is coated with a coating material to form a single-sided coating structure.

[0014] Furthermore, the sodium foil is arranged opposite to a side of a sodium ion battery electrode coated with the coating material.

[0015] Furthermore, the sodium ion battery pole piece includes an integrally formed sodium ion battery pole piece body and a second pole lug.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] (1) The utility model designs a novel sodium ion monolithic half-cell, which can perform failure analysis on the sodium ion battery and is helpful to distinguish the structural loss of the positive and negative electrode materials inside the battery. The utility model adopts aluminum foil conductive glue as the current collector of metallic sodium, and bonds it with metallic sodium foil as the metallic sodium counter electrode, which improves the convenience of operating the sodium ion monolithic half-cell. The preparation method is simple, which improves the speed of making the sodium ion monolithic half-cell. The commercial aluminum foil conductive glue is purchased, which is convenient for subsequent disassembly and the bonding process is simple. The monolithic half-cell prepared by the utility model has high yield and safety.

[0018] (2) The aluminum foil conductive adhesive of the utility model comprises an integrally formed aluminum foil conductive adhesive body and a first pole ear. The first pole ear is welded to an external pole ear and connected to an external circuit load for detection. The length and width of the first pole ear are controlled to facilitate welding with the external pole ear.

[0019] (3) The sodium foil of the utility model is formed by rolling a metallic sodium block. If the thickness of the metallic sodium foil is too thin, the subsequent cycle stability of the half-battery will be reduced. If it is too thick, the impedance of the battery will be increased, and the capacity will be lower in subsequent tests.

[0020] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0022] Figure 1 This is a schematic diagram of the structure of an aluminum foil conductive adhesive of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of a sodium foil of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of a metallic sodium counter electrode of the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of a sodium ion battery pole piece of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of a sodium ion monolithic half-cell of the utility model;

[0027] Figure 6 for Figure 5 Cross-sectional view along the A-A' direction.

[0028] Reference numerals:

[0029] 11-aluminum foil conductive glue body, 12-first pole ear, 2-sodium foil, 3-sodium ion battery pole piece, 31-sodium ion battery pole piece body, 32-second pole ear, 4-diaphragm bag. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0031] A specific embodiment of the utility model is as follows Figure 1-6 As shown, a sodium ion monolithic half-cell is disclosed, comprising a diaphragm bag 4, a sodium ion battery pole piece 3 and a metallic sodium counter electrode, wherein the sodium ion battery pole piece 3 is located in the cavity of the diaphragm bag 4, the metallic sodium counter electrode is attached to the outside of the diaphragm bag 4, and the metallic sodium counter electrode is formed by bonding a sodium foil 2 and an aluminum foil conductive adhesive.

[0032] The utility model designs a novel sodium ion monolithic half-cell, adopts aluminum foil conductive glue 1 as the current collector of metallic sodium, and is bonded with metallic sodium foil 2 as the metallic sodium counter electrode, thereby improving the convenience of sodium ion monolithic half-cell operation, and the preparation method is simple, thereby improving the speed of sodium ion monolithic half-cell production, and the commercial aluminum foil conductive glue is purchased, and the subsequent disassembly is convenient, and the bonding process is simple. The monolithic half-cell prepared by the utility model has high yield and safety, and the sodium ion half-cell prepared by the utility model can perform failure analysis on the sodium ion battery, which is conducive to distinguishing the structural loss of the positive and negative electrode materials inside the battery.

[0033] In a specific embodiment, the thickness of the sodium foil 2 is 10-13 μm.

[0034] The sodium foil 2 of the utility model is formed by rolling a metal sodium block. If the thickness of the metal sodium foil 2 is too thin, the subsequent cycle stability of the half-battery will be reduced. If it is too thick, the impedance of the battery will be increased, and the capacity will be lower in subsequent detection.

[0035] In a specific embodiment, Figure 1 As shown, the aluminum foil conductive adhesive comprises an integrally formed aluminum foil conductive adhesive body 11 and a first electrode tab 12 .

[0036] In a specific embodiment, the length of the first electrode tab 12 is 1 to 2 cm, and the width of the first electrode tab 12 is 0.5 to 1 cm.

[0037] It should be noted that the first pole tab 12 of the utility model is obtained by cutting the aluminum foil conductive adhesive body 11, and the first pole tab 12 is explained by taking a rectangle as an example. The first pole tab 12 is welded with an external pole tab, connected to an external circuit load for detection, and the length and width of the first pole tab 12 are controlled to facilitate welding with the external pole tab.

[0038] In a specific embodiment, Figure 2 As shown, the sodium foil 2 and the aluminum foil conductive adhesive body 11 have the same shape and size, both of which are rectangular.

[0039] Preferably, the sodium foil 2 or the aluminum foil conductive adhesive body 11 has a length of 5 to 6 cm and a width of 4 to 5 cm.

[0040] In a specific embodiment, the sodium ion battery electrode 3 is a positive electrode or a negative electrode.

[0041] In a specific embodiment, the upper end of the diaphragm bag 4 is provided with an opening, and the sodium ion battery electrode 3 is placed in the cavity of the diaphragm bag 4 through the opening.

[0042] In a specific embodiment, one side of the sodium ion battery pole piece 3 is coated with a coating material to form a single-sided coating structure.

[0043] It should be noted that the coating material of the present invention is a positive electrode coating material or a negative electrode coating material, which is specifically determined according to whether the electrode is a positive electrode or a negative electrode. The coating materials are all materials in the prior art. The sodium ion battery electrode 3 described in the present invention is disassembled from a failed battery to be tested.

[0044] In a specific embodiment, the sodium foil 2 is arranged opposite to a side of the sodium ion battery electrode 3 coated with the coating material.

[0045] Specifically, the sodium foil 2 and the sodium ion battery pole piece 3 are stacked together.

[0046] In a specific embodiment, the material of the diaphragm bag 4 is a PP diaphragm.

[0047] In a specific embodiment, Figure 4 As shown, the sodium ion battery pole piece 3 includes an integrally formed sodium ion battery pole piece body 31 and a second pole ear 32 .

[0048] In a specific embodiment, the first pole tab 12 and the second pole tab 32 are staggered.

[0049] In a specific embodiment, the size of the sodium ion battery pole piece body 31 matches that of the diaphragm bag 4 , so that the sodium ion battery body 31 can be loaded into the diaphragm bag 4 .

[0050] Exemplarily, the length of the sodium ion battery pole piece body 31 is 5 to 6 cm, and the width is 4 to 5 cm. The length of the diaphragm bag 4 is 5.5 to 6.5 cm, and the width is 4.3 to 5.3 cm.

[0051] Preferably, the second electrode tab 32 has a width of 0.5-1 cm and a length of 1-2 cm.

[0052] Preferably, the length and width of the sodium foil 2 are greater than the length and width of the sodium ion battery pole piece body 31, ensuring that the metal sodium foil 2 can completely cover the sodium ion battery pole piece body 31, thereby being able to fully exert its capacity in subsequent testing.

[0053] The sodium ion half-battery prepared by the utility model can be used to perform failure analysis on the sodium ion battery.

[0054] The technical solution of the present utility model is further explained below in conjunction with specific embodiments.

[0055] Example 1

[0056] like Figure 1-6 As shown, a sodium ion monolithic half-cell of the present embodiment comprises a diaphragm bag 4, a sodium ion battery pole piece 3 and a metallic sodium counter electrode, wherein the sodium ion battery pole piece 3 is located in the cavity of the diaphragm bag 4, the metallic sodium counter electrode is attached to the outside of the diaphragm bag 4, and the metallic sodium counter electrode is formed by bonding a sodium foil 2 and an aluminum foil conductive adhesive.

[0057] Specifically, Figure 5 The cross-sectional view along the A-A' direction is shown in Figure 6As shown, from left to lower right, a diaphragm bag 4, a sodium ion battery electrode 3, a diaphragm bag 4, a sodium foil 2 and an aluminum foil conductive adhesive body 11 are arranged in sequence.

[0058] Specifically, the aluminum foil conductive adhesive comprises an integrally formed aluminum foil conductive adhesive body 11 and a first pole ear 12. The length of the first pole ear 12 is 1 cm, and the width of the first pole ear 12 is 0.5 cm. The sodium foil 2 and the aluminum foil conductive adhesive body 11 have the same shape, both of which are rectangular. The length of the sodium foil 2 and the aluminum foil conductive adhesive body 11 is 6 cm, the width is 5 cm, and the thickness of the sodium foil 2 is 10 μm.

[0059] The upper end of the diaphragm bag 4 is provided with an opening, and the sodium ion battery pole piece 3 is placed in the cavity of the diaphragm bag 4 through the opening. One side of the sodium ion battery pole piece 3 is coated with a coating material to form a single-sided coating structure. The sodium foil 2 is arranged opposite to the side of the sodium ion battery pole piece 3 coated with the coating material. The material of the diaphragm bag 4 is a PP diaphragm.

[0060] The sodium ion battery pole piece 3 includes an integrally formed sodium ion battery pole piece body 31 and a second pole ear 32. The first pole ear 12 and the second pole ear 32 are staggered, and the sodium ion battery pole piece body 31 is matched with the size of the diaphragm bag 4. The length of the sodium ion battery pole piece body 31 is 5 cm and the width is 4 cm. The length of the diaphragm bag 4 is 5.5 cm and the width is 4.3 cm. The width of the second pole ear 32 is 0.5 cm and the length is 1 cm.

[0061] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A sodium ion monolithic half-cell, characterized in that: It includes a diaphragm bag, a sodium ion battery pole piece and a metal sodium counter electrode. The sodium ion battery pole piece is located in the cavity of the diaphragm bag, the metal sodium counter electrode is attached to the outside of the diaphragm bag, and the metal sodium counter electrode is formed by bonding sodium foil and aluminum foil with conductive glue.

2. A sodium ion monolithic half-cell according to claim 1, characterized in that: The thickness of the sodium foil is 10-13 μm.

3. A sodium ion monolithic half-cell according to claim 1 or 2, characterized in that: The aluminum foil conductive adhesive comprises an integrally formed aluminum foil conductive adhesive body and a first electrode tab.

4. A sodium ion monolithic half-cell according to claim 3, characterized in that: The length of the first electrode tab is 1-2 cm, and the width of the first electrode tab is 0.5-1 cm.

5. A sodium ion monolithic half-cell according to claim 3, characterized in that: The sodium foil and the aluminum foil conductive adhesive have the same body shape and size.

6. A sodium ion monolithic half-cell according to claim 5, characterized in that: The length of the sodium foil or aluminum foil conductive adhesive body is 5-6 cm and the width is 4-5 cm.

7. A sodium ion monolithic half-cell according to claim 1, characterized in that: The upper end of the diaphragm bag is provided with an opening, and the sodium ion battery pole piece is placed in the cavity of the diaphragm bag through the opening.

8. A sodium ion monolithic half-cell according to claim 1, characterized in that: One side of the sodium ion battery pole piece is coated with a coating material to form a single-sided coating structure.

9. A sodium ion monolithic half-cell according to claim 8, characterized in that: The sodium foil is arranged opposite to a side of the sodium ion battery pole piece coated with the coating material.

10. A sodium ion monolithic half-cell according to claim 1, characterized in that: The sodium ion battery pole piece comprises an integrally formed sodium ion battery pole piece body and a second pole ear.

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