High-capacity solid sodium ion battery cell

Abstract

The utility model relates to a high-capacity solid sodium ion battery cell which is characterized by comprising a positive plate (1) and a negative plate (2), the positive plate (1) is provided with a positive tab (11), the negative plate (2) is provided with a negative tab (21), and the positive tab (11) and the negative tab (21) are oppositely arranged; the positive plate (1) or the negative plate (2) is provided with a positioning groove (111); the positive plate (1) comprises ternary sodium; the negative plate (2) comprises hard carbon; the device further comprises a diaphragm (3) and an aluminum plastic film (5). The positive plates (1) and the negative plates (2) are stacked in sequence, and the diaphragms (3) are arranged between the adjacent positive plates (1) and negative plates (2); the positive tab (11) and the negative tab (21) are oppositely arranged and are exposed from the diaphragm (3); the aluminum-plastic film (5) surrounds the positive plate (1), the negative plate (2) and the diaphragm (3), and electrolyte is arranged in the aluminum-plastic film (5).

Description

Technical Field

[0001] The utility model relates to a large-capacity solid-state sodium ion pole piece and a battery core thereof. Background Art

[0002] With the application of sodium-ion batteries in energy storage, the capacity of single cells is increasing. As the cell electrodes become larger, the absolute charge and discharge currents become enormous. Therefore, the cell tabs must be able to withstand high current overloads without heating. In the lamination process, if the tabs are on the same side of the electrode, electrons will be transferred along the shortest distance between the positive and negative electrode tabs, which will affect the released capacity of the cell, especially during high-rate charge and discharge, where the temperature rise effect is very significant. To solve this problem, the present invention innovates the discharge method of the positive and negative tabs, effectively resolving this issue. Although sodium batteries and lithium batteries have many similarities, sodium-ion batteries and lithium-ion batteries differ significantly in the negative electrode current collector and negative electrode tab. Due to potential reasons, sodium-ion batteries, especially solid-state sodium batteries, use the same negative electrode current collector as the positive electrode current collector, which is aluminum foil. The negative electrode tabs, like the positive electrode tabs, are also aluminum foil with selant. This can easily lead to confusion during the production process and is difficult to distinguish. The present invention effectively solves this problem and uses slots to fix and position the positive and negative tabs in the combined battery pack, facilitating welding. Utility Model Content

[0003] One purpose of the present invention is to solve or alleviate the above technical problems.

[0004] The method adopted by the utility model is a large-capacity solid-state sodium ion electrode, which includes a positive electrode and a negative electrode; the positive electrode is provided with a positive electrode ear, and the negative electrode is provided with a negative electrode ear, and the positive electrode ear and the negative electrode ear are arranged opposite to each other.

[0005] According to a further technical solution, the positive electrode sheet or the negative electrode sheet is provided with a positioning groove.

[0006] According to a further technical solution, the positive electrode sheet includes ternary sodium.

[0007] In a further technical solution, the negative electrode sheet includes hard carbon.

[0008] A large-capacity solid-state sodium-ion battery cell comprises the large-capacity solid-state sodium-ion electrode sheet, a separator and an aluminum-plastic film; the positive electrode sheet and the negative electrode sheet are stacked in sequence, and a separator is provided between adjacent positive and negative electrode sheets; the positive electrode tab and the negative electrode tab are arranged opposite to each other and are both exposed from the separator; the aluminum-plastic film surrounds the positive electrode sheet, the negative electrode sheet and the separator, and an electrolyte comprising sodium hexafluorophosphate and an organic solvent is provided in the aluminum-plastic film.

[0009] According to a further technical solution, there is one less positive electrode sheet than the negative electrode sheet.

[0010] According to a further technical solution, a separator is provided on the outside of the outermost negative electrode sheet.

[0011] According to a further technical solution, the diaphragm is a single piece.

[0012] Made into BT120888699, capacity 600Ah.2C test discharge capacity tab temperature. The use of the present invention and the use of the present invention without the comparison of the performance of the following.

[0013] Case Patented product of this invention No patent for this invention 1 60℃ 102℃ 2 65℃ 101℃ 3 63℃ 100℃ 4 65℃ 103℃ 5 62℃ 102℃

[0014] The effect achieved by the utility model is that the battery performance and production stability can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view schematic diagram of the positive electrode sheet 1 of an embodiment of the present utility model.

[0016] Figure 2 It is a front view schematic diagram of the negative electrode sheet 2 of an embodiment of the present utility model.

[0017] Figure 3 This is a front view schematic diagram of the positive electrode sheet 1 and the negative electrode sheet 2 placed together in an embodiment of the present invention, and the figure is used for comparing the positive electrode sheet 1 and the negative electrode sheet 2.

[0018] Figure 4 It is a schematic front view of the positive electrode sheet 1, the negative electrode sheet 2, and the separator 3 after being stacked in an embodiment of the present utility model.

[0019] Figure 5 It is a schematic front view of the positive electrode sheet 1, the negative electrode sheet 2, and the separator 3 after being stacked in an embodiment of the present utility model.

[0020] Figure 6 It is a front view schematic diagram of a cutaway aluminum-plastic film 5 of a large-capacity solid-state sodium ion battery cell according to an embodiment of the present utility model.

[0021] Designate the drawings in the specification Figure 1 The following is an abstract.

[0022] Positive electrode sheet 1; positive electrode ear 11; positioning groove 111; negative electrode sheet 2; negative electrode ear 21; separator 3; aluminum-plastic film 5. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention will be described below with reference to the accompanying drawings.

[0024] As a specific embodiment, the high-capacity solid-state sodium ion electrode of the embodiment of the present invention includes a positive electrode sheet 1 and a negative electrode sheet 2. A positioning groove 111 is provided on the positive electrode sheet 1 or the negative electrode sheet 2. This facilitates distinguishing and positioning the positive electrode sheet 1 and the negative electrode sheet 2, and also improves production stability.

[0025] The positioning groove 111 is 2*111 mm.

[0026] The positive electrode sheet 1 is provided with a positive electrode tab 11. The positive electrode sheet 1 comprises ternary sodium, and other specific components, structures, etc. are the prior art.

[0027] The negative electrode sheet 2 is provided with a negative electrode ear 21. The negative electrode sheet 2 comprises hard carbon, and other specific components, structures, etc. are conventional.

[0028] The large-capacity solid-state sodium ion battery cell further includes a diaphragm 3 and an aluminum-plastic film 5.

[0029] The positive electrode sheets 1 and the negative electrode sheets 2 are stacked in sequence, and a separator 3 is provided between adjacent positive electrode sheets 1 and negative electrode sheets 2. For example, there are two positive electrode sheets 1 and three negative electrode sheets 2.

[0030] The positive electrode tab 11 and the negative electrode tab 21 are arranged opposite to each other and are both exposed from the separator 3 , that is, the positive electrode tab 11 faces upward and the negative electrode tab 21 faces downward.

[0031] The aluminum-plastic film 5 surrounds the positive electrode sheet 1 , the negative electrode sheet 2 and the separator 3 , and an electrolyte including sodium hexafluorophosphate and an organic solvent is provided in the aluminum-plastic film 5 .

[0032] As one specific embodiment, the number of positive electrode sheets 1 is less than the number of negative electrode sheets 2 .

[0033] As one of the specific embodiments, a separator 3 is provided outside the outermost negative electrode sheet 2 .

[0034] As one of the specific implementations, the diaphragm 3 is a single piece.

Claims

1. Large-capacity solid-state sodium-ion battery cell, characterized by: The invention comprises a positive electrode sheet (1) and a negative electrode sheet (2); the positive electrode sheet (1) is provided with a positive electrode ear (11), the negative electrode sheet (2) is provided with a negative electrode ear (21), and the positive electrode ear (11) and the negative electrode ear (21) are arranged opposite to each other; the positive electrode sheet (1) or the negative electrode sheet (2) is provided with a positioning groove (111); the positive electrode sheet (1) comprises ternary sodium; the negative electrode sheet (2) comprises hard carbon; and further comprises a diaphragm (3) and an aluminum-plastic film (5); the positive electrode sheet (1) and the negative electrode sheet (2) are stacked in sequence, and a diaphragm (3) is provided between adjacent positive electrode sheets (1) and negative electrode sheets (2); the positive electrode ear (11) and the negative electrode ear (21) are arranged opposite to each other and are both exposed from the diaphragm (3); the aluminum-plastic film (5) surrounds the positive electrode sheet (1), the negative electrode sheet (2) and the diaphragm (3), and an electrolyte is provided in the aluminum-plastic film (5).

2. The large-capacity solid-state sodium ion battery cell according to claim 1, characterized in that: The number of positive electrode sheets (1) is less than that of negative electrode sheets (2).

3. The large-capacity solid-state sodium ion battery cell according to claim 2, characterized in that: A diaphragm (3) is provided on the outside of the outermost negative electrode sheet (2).

4. The large-capacity solid-state sodium ion battery cell according to claim 3, characterized in that: The diaphragm (3) is a single piece.

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