Sodium ion button type symmetrical battery

Abstract

The utility model provides a sodium ion button type symmetrical battery, which comprises a cathode shell, a first rubberized pole piece, a diaphragm, a second rubberized pole piece and an anode shell which are sequentially arranged from top to bottom, and the first rubberized pole piece and the second rubberized pole piece are battery pole pieces coated with conductive adhesive. According to the utility model, the conductive adhesive covers the active material layer on one side of the first rubberized pole piece and the active material layer on one side of the second rubberized pole piece, so that the contact and electrochemical reaction between electrolyte and the active material layers can be prevented, the scrubbing process of NMP (N-Methyl Pyrrolidone) and deionized water is avoided, and the assembly convenience of the sodium ion button type symmetrical battery is improved; therefore, the time for manufacturing the button-type symmetrical battery can be shortened, and the accuracy of a test result is not influenced.

Description

TECHNICAL FIELD

[0001] The utility model relates to sodium ion battery failure analysis technical field, especially in kind of sodium ion button type symmetry battery. BACKGROUND

[0002] Lithium ion battery has been widely applied in new energy automobile, energy storage and other fields, due to the limitation of lithium ion battery material resources, the price is rising, lithium ion battery sustainable development is limited to a certain extent, under the relative circumstances, sodium ion battery has the similar working principle with lithium ion battery, and sodium ion resource distribution is extensive, low cost, good safety performance is expected to be widely applied, therefore with the rapid development of sodium battery, the rhythm of product launch is accelerated, and the product failure point also gradually increases.

[0003] In the prior art, NMP is used to wipe off the active material layer of one side of the pole piece, and then the pole piece is cut into a corresponding size, and assembled into a positive or negative button type symmetry battery for corresponding electrochemical test to analyze the positive and negative internal resistance. The process is complicated and time-consuming, and NMP is corrosive and harmful to human health. UTILITY MODEL CONTENT

[0004] To solve the above problems, the utility model aims at providing a kind of sodium ion button type symmetry battery, by using conductive glue to cover the active material layer of one side of the first adhesive pole piece and the second adhesive pole piece, the contact between electrolyte and the active material layer can be prevented, and electrochemical reaction can be avoided, the washing process of NMP and deionized water is avoided, and the convenience of sodium ion button type symmetry battery assembly is improved.

[0005] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0006] A kind of sodium ion button type symmetry battery, including negative pole shell, first adhesive pole piece, diaphragm, second adhesive pole piece and positive pole shell installed from top to bottom, the first adhesive pole piece and the second adhesive pole piece are both battery pole pieces with conductive glue.

[0007] Further, the first adhesive pole piece and the second adhesive pole piece are positive pole pieces or negative pole pieces with conductive glue, and the positive pole pieces or negative pole pieces each include upper and lower active material layers and a middle current collector, the conductive glue is attached to the active material layer, and one side of the conductive glue of the first adhesive pole piece and the second adhesive pole piece respectively faces the negative pole shell and the positive pole shell.

[0008] Further, the conductive glue is copper foil conductive glue or aluminum foil conductive glue.

[0009] Further, the positive plate or the negative plate is a plate taken out after being disassembled from a failed sodium ion battery.

[0010] Further, the negative shell and the first pasted glue plate are provided with a spring and a gasket.

[0011] Further, the positive shell and the negative shell are 2015, 2024 or 2032 type.

[0012] Further, the thickness of the first pasted glue plate and the second pasted glue plate is 1.1-1.8mm.

[0013] Further, the first pasted glue plate and the second pasted glue plate are round plates with a diameter of 1.2-1.8cm.

[0014] Further, the diaphragm is a round diaphragm with a diameter of 1.3-1.9cm.

[0015] Further, the round diaphragm is a PP, PE or glass fiber diaphragm.

[0016] Beneficial effects: the conductive glue covers one side of the active material layer of the first pasted glue plate and the second pasted glue plate, which can prevent the contact between the electrolyte and the active material layer and the electrochemical reaction, avoid the scrubbing process of NMP and deionized water, and improve the convenience of assembling the sodium ion button type symmetrical battery; thereby the time for manufacturing the button type symmetrical battery can be reduced, and the accuracy of the test result is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings that form a part of the present application are used to provide a further understanding of the present application, and the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0018] Fig. 1 The structure schematic view of the sodium ion button type symmetrical battery is shown in the present application.

[0019] Fig. 2 The structure schematic view of the first pasted glue plate or the second pasted glue plate of the sodium ion button type symmetrical battery is shown in the present application. DETAILED DESCRIPTION

[0020] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0021] The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0022] Embodiment 1

[0023] ReferenceFigs. 1-2 A sodium-ion button-type symmetrical battery comprises, from top to bottom, a negative shell 1, a first pasted electrode tab 2, a separator 3, a second pasted electrode tab 4, and a positive shell 5, wherein the first pasted electrode tab 2 and the second pasted electrode tab 4 are both battery electrode tabs pasted with conductive adhesive 6.

[0024] In this embodiment, the conductive adhesive covers one side of the active material layer of the first pasted electrode tab and the second pasted electrode tab, which prevents the contact between the electrolyte and the active material layer and the occurrence of electrochemical reaction, avoids the scrubbing process of NMP and deionized water, and improves the convenience of assembling the sodium-ion button-type symmetrical battery, thereby reducing the time for making the button-type symmetrical battery and not affecting the accuracy of the test results.

[0025] In a specific example, the first pasted electrode tab 2 and the second pasted electrode tab 4 are both positive electrode tabs or negative electrode tabs pasted with conductive adhesive 6, and each of the positive electrode tab or the negative electrode tab comprises upper and lower active material layers 7 and a current collector 8 in the middle, wherein the conductive adhesive 6 is pasted on the active material layer 7, and one side of the conductive adhesive 6 of the first pasted electrode tab 2 and the second pasted electrode tab faces the negative shell 1 and the positive shell 5, respectively.

[0026] In this embodiment, the two pasted electrode tabs are two positive electrode tabs or two negative electrode tabs, and two positive electrode tabs are used to test the internal resistance of the positive electrode tab, and two negative electrode tabs are used to test the internal resistance of the negative electrode tab; one side of the conductive adhesive pasted on the two electrode tabs faces the positive / negative shell.

[0027] In a specific example, the conductive adhesive 6 is copper foil conductive adhesive or aluminum foil conductive adhesive.

[0028] In a specific example, the positive electrode tab or the negative electrode tab is taken out from the electrode tab disassembled from a failed sodium-ion battery.

[0029] In a specific example, the negative shell 1 and the first pasted electrode tab 2 are provided with a spring 9 and a gasket 10.

[0030] The spring and the gasket in this embodiment mainly serve to support the battery and maintain the proper spacing of the internal components of the battery; the use of the spring and the gasket helps to ensure the structural integrity and stability of the battery during the assembly process and the use process.

[0031] In a specific example, the positive shell 5 and the negative shell 1 are of type 2015, 2024, or 2032.

[0032] In a specific example, the thickness of the first pasted electrode tab 2 and the second pasted electrode tab 4 is 1.1-1.8 mm.

[0033] It should be noted that the thickness of the pasted electrode sheet is too small, which can easily lead to a decrease in the porosity of the electrode sheet during the rolling process to make the composite electrode sheet, thereby making the test result of the internal resistance of the electrode sheet larger, and the thickness is too large, which is not conducive to the adhesion of the conductive adhesive and the active material layer, and can easily lead to poor contact, thereby making the test result of the internal resistance of the electrode sheet larger.

[0034] In a specific example, the first pasted electrode sheet 2 and the second pasted electrode sheet 4 are in the form of a circular sheet with a diameter of 1.2-1.8 cm.

[0035] The upper limit of the diameter of the embodiment is to adapt to the size of the existing positive and negative electrode shells, and a too small diameter is not conducive to the alignment between the electrode sheets, thereby leading to a larger test result of the internal resistance of the electrode sheet.

[0036] In a specific example, the separator 3 is a circular sheet-shaped separator with a diameter of 1.3-1.9 cm.

[0037] The embodiment limits the size of the separator, which can completely cover the pasted electrode sheet and avoid short circuit of the battery caused by contact between the electrode sheets.

[0038] In a specific example, the circular sheet-shaped separator is a PP, PE or glass fiber separator.

[0039] The specific manufacturing steps of the sodium ion button-type symmetrical battery of the embodiment are as follows: first, in a drying room, the battery is disassembled to take out the roll core, the roll core is transferred to an inert gas protection glove box, the contact between the electrode sheet and the moisture and oxygen in the air can be reduced, thereby reducing the possibility of oxidation reaction, the roll core is unfolded, the positive and negative electrodes are disassembled, the positive and negative electrode sheets are taken out respectively, the DMC solvent is repeatedly cleaned several times, and the sodium salt and the solvent are removed by soaking for 10-30 min, and the roll core is dried at room temperature; the copper foil conductive adhesive or the aluminum foil conductive adhesive is pasted on the other side of the electrode sheet, the metal rod is repeatedly rolled several times to increase the adhesion of the copper foil conductive adhesive or the aluminum foil conductive adhesive and the electrode sheet, the cutting machine is used to cut into a corresponding size, and the spring and the gasket are stacked together and placed in the negative electrode shell, the electrolyte is added dropwise, the separator is added, the other side of the electrode sheet pasted with the copper foil conductive adhesive or the aluminum foil conductive adhesive is placed, the active material layers of the two electrode sheets are opposite to each other, the positive electrode shell is covered, and then the button voltage piece machine is used for pressing, so as to obtain the sodium ion button-type symmetrical battery.

[0040] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A sodium-ion button symmetric cell, characterized in that, It comprises, from top to bottom, a negative shell (1), a first adhesive electrode sheet (2), a diaphragm (3), a second adhesive electrode sheet (4) and a positive shell (5), the first adhesive electrode sheet (2) and the second adhesive electrode sheet (4) are both battery electrode sheets coated with conductive adhesive (6), the first adhesive electrode sheet (2) and the second adhesive electrode sheet (4) are positive electrode sheets or negative electrode sheets coated with conductive adhesive (6), the positive electrode sheet or the negative electrode sheet comprises upper and lower active material layers (7) and a middle current collector (8), the conductive adhesive (6) is coated on the active material layer (7), one side of the conductive adhesive (6) of the first adhesive electrode sheet (2) and the second adhesive electrode sheet respectively faces the negative shell (1) and the positive shell (5).

2. The sodium-ion button symmetric cell of claim 1, wherein, The conductive adhesive (6) is copper foil conductive adhesive or aluminum foil conductive adhesive.

3. The sodium-ion button symmetric cell of claim 1, wherein, The positive electrode sheet or the negative electrode sheet is the electrode sheet taken out after disassembling from the failed sodium ion battery.

4. The sodium-ion button symmetric cell of claim 1, wherein, The negative shell (1) and the first adhesive electrode sheet (2) are provided with a spring (9) and a gasket (10).

5. The sodium-ion button symmetric cell of claim 1, wherein, The positive shell (5) and the negative shell (1) are 2015, 2024 or 2032 type.

6. The sodium-ion button symmetric cell of claim 1, wherein, The thickness of the first adhesive electrode sheet (2) and the second adhesive electrode sheet (4) is 1.1-1.8mm.

7. The sodium-ion button symmetric cell of claim 1, wherein, The first adhesive electrode sheet (2) and the second adhesive electrode sheet (4) are circular sheet-shaped with a diameter of 1.2-1.8cm.

8. The sodium-ion button symmetric cell of claim 1, wherein, The diaphragm (3) is a circular sheet-shaped diaphragm with a diameter of 1.3-1.9cm.

9. The sodium-ion button symmetric cell of claim 8, wherein, The circular sheet-shaped diaphragm is PP, PE or glass fiber diaphragm.

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