Novel sodium ion square energy storage cell cover plate and cell

Abstract

The utility model discloses a novel sodium ion square energy storage battery cell cover plate and a battery cell comprising the battery cell cover plate. The battery cell cover plate comprises a bright aluminum sheet, a pole and a lower plastic plate which are arranged on one side of the bright aluminum sheet, and a sealant arranged between the pole and the lower plastic plate; the upper plastic sheet and the welding sheet are arranged on the other side of the polished aluminum sheet, a first through hole is formed in the polished aluminum sheet, a second through hole is formed in the lower plastic plate, and the pole is embedded in the through hole of the lower plastic plate in a sleeved mode and penetrates through the annular sealant to be fixed in the first through hole; the upper plastic sheet and the welding sheet are ring-shaped, the upper plastic sheet fixes the pole column from the other side of the light aluminum sheet, the welding sheet is arranged on the outermost side of the upper plastic sheet, and the welding sheet and the pole column are welded and connected around the inner side surface of the ring-shaped hole of the welding sheet through a laser welding process along the direction from the first through hole to the second through hole. The battery cell cover plate is light and thin in structure and high in yield, can be instantly melted when the battery cell is short-circuited, cuts off the connection between the pole and the positive and negative electrodes of the battery cell, and protects the battery cell from being damaged.

Description

Technical Field

[0001] The utility model relates to the field of sodium ion batteries, and in particular to a novel sodium ion square energy storage battery cover and a battery. Background Art

[0002] In recent years, lithium-ion batteries have developed rapidly and have been widely used in all walks of life. However, the growing demand and scarce lithium resources directly restrict the development of lithium-ion batteries. At present, a large part of lithium resources rely on imports, which poses a risk of bottlenecks. In contrast, sodium atoms have similar atomic structures and chemical properties to lithium atoms. They are abundant in global reserves, safe in performance, and low in cost, and are increasingly attracting research attention in the field of energy storage.

[0003] The cover structure currently used in sodium-ion batteries is complex, with pressure plates, insulating plates, stop frames, and connecting plates for the positive and negative electrodes set around the poles. The design of such components is quite complicated, the production and manufacturing process is complex, the yield rate is extremely low, and when a short circuit occurs in the battery cell, the positive and negative electrodes of the battery cell cannot be disconnected in time, causing the entire battery cell to be easily damaged instantly, seriously affecting the safe use of the battery cell. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a novel sodium ion square energy storage battery cover and battery cell, which simplifies the production process and improves the production yield by designing the battery cell cover in a very simple and light manner. At the same time, the internal space of the entire battery cell is increased, the battery cell capacity is increased, and the safety problems caused by battery cell short circuit are reduced.

[0005] The technical solution adopted by the utility model is: to provide a novel sodium ion square energy storage battery cover, comprising a plain aluminum sheet, a pole and a lower plastic sheet arranged on one side of the plain aluminum sheet, and a sealant arranged between the pole and the lower plastic sheet; an upper plastic sheet and a welding sheet arranged on the other side of the plain aluminum sheet;

[0006] The bare aluminum sheet is provided with a first through hole, the lower plastic plate is provided with a second through hole, the sealant is in a ring shape, the pole is inserted into the through hole of the lower plastic plate, and is fixed in the first through hole of the bare aluminum sheet through the ring-shaped sealant;

[0007] The upper plastic sheet and the welding sheet are both in the shape of a ring. The upper plastic sheet fixes the pole from the other side of the bare aluminum sheet. The welding sheet is arranged on the outermost side of the upper plastic sheet. The welding sheet and the pole are welded and connected around the inner side of the annular hole of the welding sheet by a laser welding process along the direction from the first through hole to the second through hole.

[0008] Preferably, the pole has a pole boss, and the pole boss is composed of n boss columns and a boss panel, where n≥2.

[0009] Preferably, the boss column is made of aluminum material.

[0010] Preferably, the boss column is a solid column. When a short circuit occurs in the battery cell and the current is relatively high, the solid boss column can be used directly, and the high current can instantly melt the solid boss column.

[0011] Preferably, the boss column is a hollow column. When a short circuit occurs in the battery cell and the current is lower than that in the use environment of the solid boss column, the hollow boss column can be used directly, and the current is still sufficient to melt the hollow boss column instantly.

[0012] Furthermore, a battery cell is provided, which has the above-mentioned novel sodium ion square energy storage battery cell cover.

[0013] Preferably, the length of the battery cell is 170mm-175mm, the width is 65mm-75mm, and the height is 205mm-210mm.

[0014] The beneficial effects of the utility model are as follows: the new sodium ion square energy storage battery cover described in the present application is adopted, and the pole is tightly arranged on the light aluminum sheet through the upper plastic sheet and the lower plastic sheet, combined with the annular hole and the through-hole structure design, and the welding sheet is welded to the pole along the inner side of the annular hole through the laser welding process, so that the various structures of the entire battery cover are tightly fixed, such a cover structure is light and thin, the production and manufacturing process is simple, the yield rate is high, and the thinning and thickening of the cover can increase the battery capacity by at least 10%, thereby improving the battery storage capacity. Further, the pole of the present application is designed as a plurality of bosses and boss panels, and the bosses are made of aluminum. When the battery cell is short-circuited, the bosses can be melted instantly under the action of a large current. Since the pole is connected to the positive and negative poles of the battery cell, after the bosses of the poles are melted, the positive and negative poles of the battery cell will be quickly disconnected, protecting the battery cell from being easily damaged by a short circuit, improving the safety of the battery cell, and extending the service life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0016] Figure 1 This is a schematic diagram of the explosion structure of a novel sodium ion square energy storage battery cover for this application;

[0017] Figure 2 This is a schematic diagram of the main structure of a new type of sodium ion square energy storage battery cover for this application;

[0018] Figure 3 For along Figure 2 Schematic diagram of the structure when the rear convex column is solid when viewed from the AA line;

[0019] Figure 4 for Figure 3 Schematic diagram of the structure when the central boss column is hollow;

[0020] Figure 5 This is a schematic diagram of the main structure of a new type of sodium ion square energy storage battery cover plate pole in this application;

[0021] Figure 6 for Figure 5 Bottom view of

[0022] Figure 7 for Figure 5 Schematic diagram of the three-dimensional structure;

[0023] Figure 8 This is a schematic diagram of a battery cell structure for this application.

[0024] In the figure: 1-plain aluminum sheet, 11-first through hole; 2-pole, 21-pole boss, 211-boss column, 212-boss panel; 3-lower plastic plate, 31-second through hole; 4-sealant, 5-upper plastic sheet, 6-welding sheet. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0026] like Figure 1-Figure 4 As shown, a novel sodium ion square energy storage battery cover is provided, comprising a plain aluminum sheet 1, a pole 2 and a lower plastic plate 3 arranged on one side of the plain aluminum sheet 1, and a sealant 4 arranged between the pole 2 and the lower plastic plate 3; an upper plastic sheet 5 and a welding sheet 6 arranged on the other side of the plain aluminum sheet 1; the plain aluminum sheet 1 is the base structure of the battery cover, the pole 2 is a conductor, the pole 2 is connected to the positive and negative electrodes of the battery cell, and the insulation between the pole 2 and the plain aluminum sheet 1 needs to be ensured during the structural design. A first through hole 11 is formed on the bare aluminum sheet 1, a second through hole 31 is formed on the lower plastic plate 3, the sealant 4 is in a ring shape, the pole 2 is inserted into the through hole 31 of the lower plastic plate 3, and is fixed in the first through hole 11 on the bare aluminum sheet 1 through the ring-shaped sealant 4; the upper plastic sheet 5 and the welding sheet 6 are both in a ring shape, the upper plastic sheet 5 fixes the pole 2 from the other side of the bare aluminum sheet 1, the welding sheet 6 is arranged on the outermost side of the upper plastic sheet 5, and the welding sheet 6 and the pole 2 are welded and connected around the inner side of the ring hole of the welding sheet 6 along the direction from the first through hole 11 to the second through hole 31 by a laser welding process.

[0027] like Figure 5-Figure 7As shown, the pole 2 has a pole boss 21, which is composed of n boss columns 211 and a boss panel 212, where n≥2. The boss column 211 is made of aluminum material, has good conductivity, and is light in weight. It can be used for the cell cover to reduce the weight of the cover.

[0028] like Figure 3 As shown, the boss column 211 is solid.

[0029] like Figure 4 As shown, the boss column 211 is hollow.

[0030] This structural design is mainly to prevent the boss column 211 of the pole 2 from being quickly fused when the battery cell encounters a short circuit, cutting off the connection between the pole 2 and the positive and negative electrodes of the battery cell, thereby preventing the battery cell 2 from being easily damaged when it encounters a short circuit, improving the safety of the battery cell, and extending the service life of the battery cell. The hollow boss column 211 can further reduce the weight of the battery cell cover, making the entire battery cell cover thinner and lighter, and at the same time, when the battery cell encounters a short circuit, the current can still meet the rapid melting of the hollow boss column 211.

[0031] like Figure 8 As shown, a battery cell having the novel sodium ion square energy storage battery cell cover plate described above in the present application, the dimensions of the battery cell satisfy: length 170mm-175mm, width 65mm-75mm, height 205mm-210mm.

[0032] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A novel sodium ion square energy storage battery cover, characterized in that: It comprises a plain aluminum sheet (1), a pole (2) and a lower plastic plate (3) arranged on one side of the plain aluminum sheet (1), and a sealant (4) arranged between the pole (2) and the lower plastic plate (3); an upper plastic sheet (5) and a welding sheet (6) arranged on the other side of the plain aluminum sheet (1); The bare aluminum sheet (1) is provided with a first through hole (11), the lower plastic plate (3) is provided with a second through hole (31), the sealant (4) is in a ring shape, the pole (2) is inserted into the through hole (31) of the lower plastic plate (3), and is fixed in the first through hole (11) on the bare aluminum sheet (1) through the ring-shaped sealant (4); The upper plastic sheet (5) and the welding sheet (6) are both in an annular shape. The upper plastic sheet (5) fixes the pole (2) from the other side of the bare aluminum sheet (1). The welding sheet (6) is arranged on the outermost side of the upper plastic sheet (5). The welding sheet (6) and the pole (2) are welded and connected around the inner side surface of the annular hole of the welding sheet (6) by a laser welding process along the direction from the first through hole (11) to the second through hole (31).

2. A novel sodium ion square energy storage battery cover according to claim 1, characterized in that: The pole (2) has a pole boss (21), and the pole boss (21) is composed of n boss columns (211) and a boss panel (212), where n≥2.

3. A novel sodium ion square energy storage battery cover according to claim 2, characterized in that: The boss column (211) is made of aluminum material.

4. A novel sodium ion square energy storage battery cover according to claim 3, characterized in that: The boss column (211) is a solid column.

5. A novel sodium ion square energy storage battery cover according to claim 3, characterized in that: The boss column (211) is a hollow column.

6. A battery cell, characterized in that: A novel sodium ion square energy storage battery cell cover as claimed in claim 1.

7. A battery cell according to claim 6, characterized in that: The length of the battery cell is 170mm-175mm, the width is 65mm-75mm, and the height is 205mm-210mm.

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