Ultra-thin sheet-shaped full-tab energy storage element
By setting a bending section on the insulating shell of the electrode assembly to form a receiving cavity to accommodate the conductive layer and the active material layer, and exposing the conductive layer at the bonding surface to form a whole electrode tab, the problem of increased internal resistance of the stacked cell is solved, and the effect of increasing the electrode tab area and reducing internal resistance is achieved, thereby reducing production costs.
Patent Information
- Application Number
- CN202423230962.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2034-12-26
AI Technical Summary
With the increase in surface area of existing stacked cells, the traditional tab arrangement leads to an increased electron conduction path and internal resistance, and the production cost of full-tab batteries is high.
An ultrathin sheet-like all-tab energy storage element is designed by forming a cavity by setting a bending section on the insulating shell of the electrode assembly to accommodate the conductive layer and the active material layer, and forming a whole tab by exposing the conductive layer at the bonding surface, which simplifies the structure and reduces internal resistance.
It effectively increases the electrode area, promotes uniform electron conduction, reduces internal resistance, and lowers production costs.
Smart Images
Figure CN224683323U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of electrical energy storage technology, specifically an ultra-thin sheet-like omnipolar energy storage element. Background Technology
[0002] In some existing batteries, the surface area of the laminated cells is generally small. Even if the tabs are usually placed at one end of the battery, it will not significantly affect the resistance of the internal electronic conduction. However, with the development of battery technology, the surface area of laminated cells is increasing. The traditional method of placing the tabs at one end of the laminated cell easily leads to an increased electronic conduction path, resulting in increased internal resistance and compromising battery safety. To address this issue, a full-tab battery has been proposed. Existing full-tab batteries are all wound cylindrical batteries, essentially consisting of multiple tabs spaced apart at both ends of the cell, with each tab connected to the casing and the core post, respectively. The structure connecting the casing and the core post to the tabs is relatively complex, resulting in high production costs for cylindrical full-tab batteries. Utility Model Content
[0003] In view of this, the purpose of this utility model is to provide an ultra-thin sheet-like full-tab energy storage element that can effectively increase the tab area to reduce internal resistance.
[0004] To achieve the above objectives, this utility model provides the following technical solution: An ultra-thin sheet-like omnipolar energy storage element includes a first electrode assembly and a second electrode assembly disposed opposite to each other, with a diaphragm or solid electrolyte layer between the first electrode assembly and the second electrode assembly; The first electrode assembly includes a first insulating shell, a first conductive layer, and a first active material layer; a first end of the first insulating shell is bent toward the side where the second electrode assembly is located to form a first bent segment, and the end of the first bent segment is provided with a second bent segment bent toward the direction of the first end; the second bent segment is provided with a first mating surface facing the second electrode assembly, and the unbent area of the first insulating shell is provided with a second mating surface facing the second electrode assembly; The second electrode assembly includes a second insulating shell, a second conductive layer, and a second active material layer; the second end of the second insulating shell is bent toward the side where the first electrode assembly is located to form a third bent section, and the end of the third bent section is provided with a fourth bent section bent toward the direction of the second end; the fourth bent section is provided with a third mating surface facing the first electrode assembly, and the unbent area of the second insulating shell is provided with a fourth mating surface facing the first electrode assembly. A receiving cavity is formed between the first insulating shell and the second insulating shell, located between the first bent section and the third bent section; the first conductive layer is disposed on the second bonding surface, and the first active material layer is coated on the first conductive layer and located within the receiving cavity; the second conductive layer is disposed on the fourth bonding surface, and the second active material layer is coated on the second conductive layer and located within the receiving cavity; the diaphragm or solid electrolyte layer is located between the first active material layer and the second active material layer. The first insulating shell and the second insulating shell are sealed together; the second mating surface extends beyond the third mating surface and exposes the first conductive layer to form a first tab; the fourth mating surface extends beyond the first mating surface and exposes the second conductive layer to form a second tab.
[0005] Furthermore, both the first insulating shell and the second insulating shell are made of insulating thermoplastic material.
[0006] Furthermore, a first thermoplastic adhesive layer is provided on the surface of the first insulating shell facing the second insulating shell, extending from the first bonding surface to the second bonding surface, and the first conductive layer is fixed to the first bonding surface by the first thermoplastic adhesive layer.
[0007] Furthermore, a second thermoplastic adhesive layer is provided on the surface of the second insulating shell facing the first insulating shell, extending from the third bonding surface to the fourth bonding surface, and the second conductive layer is fixed on the fourth bonding surface through the second thermoplastic adhesive layer.
[0008] Furthermore, the first mating surface and the fourth mating surface are sealed by heat sealing.
[0009] Furthermore, the second and third mating surfaces are sealed by heat sealing.
[0010] Furthermore, the joint between the first insulating shell and the second insulating shell is sealed by heat sealing.
[0011] Furthermore, a solid electrolyte layer is provided between the first electrode assembly and the second electrode assembly; the sum of the thicknesses of the first conductive layer, the first active material layer, the solid electrolyte layer, and the second active material layer is equal to the height of the first bending segment; the sum of the thicknesses of the first active material layer, the solid electrolyte layer, the second active material layer, and the second conductive layer is equal to the height of the second bending segment.
[0012] Furthermore, a diaphragm is provided between the first electrode assembly and the second electrode assembly; the sum of the thicknesses of the first conductive layer, the first active material layer, the diaphragm, and the second active material layer is equal to the height of the first bent section; the sum of the thicknesses of the first active material layer, the diaphragm, the second active material layer, and the second conductive layer is equal to the height of the second bent section.
[0013] The beneficial effects of this utility model are as follows: This invention discloses an ultra-thin sheet-like omnipolar energy storage element. By respectively arranging a first bending segment and a second bending segment opposite to each other on a first insulating shell and a second insulating shell, a cavity is formed between the first and second insulating shells. This cavity can accommodate a first conductive layer, a first active material layer, a separator or solid electrolyte layer, a second active material layer, and a second conductive layer, thereby constructing a cell for energy storage. By setting the second bonding surface to extend beyond the third bonding surface, the first conductive layer is exposed on the third bonding surface, forming the first tab. Similarly, By setting the fourth bonding surface to extend beyond the first bonding surface, the second conductive layer can be exposed outside the first bonding surface to form the second tab. That is, both the first tab and the second tab are set as a whole tab structure located at one end of the cell. Compared with the existing method of setting tabs only locally, it can effectively increase the area of the first tab and the second tab and avoid the problem of excessive temperature caused by excessive current at the tab position. At the same time, the first tab and the second tab are located at the two ends of the cell respectively. During charging and discharging, the electron conduction inside the cell can be more evenly distributed, which can effectively reduce the internal resistance. Attached Figure Description
[0014] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration: Figure 1 This is a schematic diagram of the structure of an embodiment of the ultra-thin sheet-like omnipolar energy storage element of this utility model.
[0015] Explanation of reference numerals in the attached figures: 10-First electrode assembly; 11-First insulating shell; 111-First bent section; 112-Second bent section; 113-First bonding surface; 114-Second bonding surface; 12-First conductive layer; 13-First active material layer; 14-First tab; 15-First thermoplastic adhesive layer; 20 - Second electrode assembly; 21 - Second insulating shell; 211 - Third bending section; 212 - Fourth bending section; 213 - Third bonding surface; 214 - Fourth bonding surface; 22 - Second conductive layer; 23 - Second active material layer; 24 - Second electrode tab; 25 - Second thermoplastic adhesive layer; 30 - Solid electrolyte layer; 40 - Receiving cavity; 41 - First heat-sealing structure; 42 - Second heat-sealing structure. Detailed Implementation
[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.
[0017] like Figure 1 As shown, the ultra-thin sheet-like omnipolar energy storage element of this embodiment includes a first electrode assembly 10 and a second electrode assembly 20 disposed opposite to each other, with a diaphragm or solid electrolyte layer 30 provided between the first electrode assembly 10 and the second electrode assembly 20.
[0018] The first electrode assembly 10 in this embodiment includes a first insulating shell 11, a first conductive layer 12, and a first active material layer 13. The first end of the first insulating shell 11 is bent towards the side where the second electrode assembly 20 is located, forming a first bent segment 111. The end of the first bent segment 111 has a second bent segment 112 bent towards the direction of the first end. The second bent segment 112 has a first mating surface 113 facing the second electrode assembly 20, and the unbent area of the first insulating shell 11 has a second mating surface 114 facing the second electrode assembly 20.
[0019] The second electrode assembly 20 in this embodiment includes a second insulating shell 21, a second conductive layer 22, and a second active material layer 23. The second end of the second insulating shell 21 is bent towards the side where the first electrode assembly 10 is located, forming a third bent segment 211. The end of the third bent segment 211 has a fourth bent segment 212 bent towards the direction of the second end. The fourth bent segment 212 has a third mating surface 213 facing the first electrode assembly 10, and the unbent area of the second insulating shell 21 has a fourth mating surface 214 facing the first electrode assembly 10.
[0020] Thus, in this embodiment, a receiving cavity 40 is formed between the first insulating shell 11 and the second insulating shell 21, located between the first bent section 111 and the third bent section 211. A first conductive layer 12 is disposed on the second bonding surface 114, and a first active material layer 13 is coated on the first conductive layer 12 and located within the receiving cavity 40. A second conductive layer 22 is disposed on the fourth bonding surface 214, and a second active material layer 23 is coated on the second conductive layer 22 and located within the receiving cavity 40. A diaphragm or solid electrolyte layer 30 is located between the first active material layer 13 and the second active material layer 23.
[0021] In this embodiment, the first insulating shell 10 and the second insulating shell 20 are sealed together. Specifically, both the first insulating shell 10 and the second insulating shell 20 are made of insulating thermoplastic material, and the joints between them are sealed by heat sealing. In this embodiment, the second mating surface 114 extends beyond the third mating surface 213, exposing the first conductive layer 12 to form the first tab 14. The fourth mating surface 214 extends beyond the first mating surface 113, exposing the second conductive layer 22 to form the second tab 24.
[0022] In a preferred embodiment of this invention, the surface of the first insulating shell 11 facing the second insulating shell 12 is provided with a first thermoplastic adhesive layer 15 extending from the first bonding surface 113 to the second bonding surface 114. The first conductive layer 12 is bonded and fixed to the first bonding surface 113 through the first thermoplastic adhesive layer 15, which can improve the bonding strength between the first conductive layer 12 and the first insulating shell 11. Similarly, correspondingly, the surface of the second insulating shell 21 facing the first insulating shell 11 is provided with a second thermoplastic adhesive layer 25 extending from the third bonding surface 213 to the fourth bonding surface 214. The second conductive layer 22 is bonded and fixed to the fourth bonding surface 214 through the second thermoplastic adhesive layer 25, which can improve the bonding strength between the second conductive layer 22 and the second insulating shell 21.
[0023] In a preferred embodiment of this invention, the first mating surface 113 and the fourth mating surface 214 are sealed by heat sealing, forming a first heat-sealing structure 41 between them. Similarly, the second mating surface 114 and the third mating surface 213 are sealed by heat sealing, forming a second heat-sealing structure 42 between them. This improves the sealing performance of the first sealing shell 11 and the second sealing shell 21 between the first tab 14 and the second tab 24.
[0024] In this embodiment, a solid electrolyte layer 30 is provided between the first electrode assembly 10 and the second electrode assembly 20. The sum of the thicknesses of the first conductive layer 12, the first active material layer 13, the solid electrolyte layer 30, and the second active material layer 23 is equal to the height of the first bending segment 111. The sum of the thicknesses of the first active material layer 13, the solid electrolyte layer 30, the second active material layer 23, and the second conductive layer 22 is equal to the height of the second bending segment 211.
[0025] Of course, in some other embodiments, a diaphragm may also be provided between the first electrode assembly 10 and the second electrode assembly 20. In this case, the sum of the thicknesses of the first conductive layer 12, the first active material layer 13, the diaphragm, and the second active material layer 23 is equal to the height of the first bent section 111. The sum of the thicknesses of the first active material layer 13, the diaphragm, the second active material layer 23, and the second conductive layer 22 is equal to the height of the second bent section 211.
[0026] The ultra-thin sheet-like omnipolar energy storage element of this embodiment, by respectively providing a first bending segment and a second bending segment opposite to each other on the first insulating shell and the second insulating shell, forms a cavity between the first insulating shell and the second insulating shell. This cavity can accommodate a first conductive layer, a first active material layer, a separator or solid electrolyte layer, a second active material layer, and a second conductive layer, thereby constructing a cell for energy storage. By setting the second bonding surface to extend beyond the third bonding surface, the first conductive layer can be exposed at the third bonding surface to form the first tab; similarly, through... By setting the fourth bonding surface to extend beyond the first bonding surface, the second conductive layer can be exposed outside the first bonding surface to form the second tab. That is, both the first tab and the second tab are set as a whole tab structure located at one end of the cell. Compared with the existing method of setting tabs only locally, it can effectively increase the area of the first tab and the second tab and avoid the problem of excessive temperature caused by excessive current at the tab position. At the same time, the first tab and the second tab are located at the two ends of the cell respectively. During charging and discharging, the electron conduction inside the cell can be more evenly distributed, which can effectively reduce the internal resistance.
[0027] The ultra-thin sheet-like omnipolar energy storage device in this embodiment can be either a battery or a capacitor.
[0028] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.
Claims
1. An ultra-thin sheet-like omnipolar energy storage element, characterized in that: It includes a first electrode assembly and a second electrode assembly disposed opposite to each other, with a membrane or solid electrolyte layer provided between the first electrode assembly and the second electrode assembly; The first electrode assembly includes a first insulating shell, a first conductive layer, and a first active material layer; a first end of the first insulating shell is bent toward the side where the second electrode assembly is located to form a first bent segment, and the end of the first bent segment is provided with a second bent segment bent toward the direction of the first end; the second bent segment is provided with a first mating surface facing the second electrode assembly, and the unbent area of the first insulating shell is provided with a second mating surface facing the second electrode assembly; The second electrode assembly includes a second insulating shell, a second conductive layer, and a second active material layer; the second end of the second insulating shell is bent toward the side where the first electrode assembly is located to form a third bent section, and the end of the third bent section is provided with a fourth bent section bent toward the direction of the second end; the fourth bent section is provided with a third mating surface facing the first electrode assembly, and the unbent area of the second insulating shell is provided with a fourth mating surface facing the first electrode assembly. A receiving cavity is formed between the first insulating shell and the second insulating shell, located between the first bent section and the third bent section; the first conductive layer is disposed on the second bonding surface, and the first active material layer is coated on the first conductive layer and located within the receiving cavity; the second conductive layer is disposed on the fourth bonding surface, and the second active material layer is coated on the second conductive layer and located within the receiving cavity; the diaphragm or solid electrolyte layer is located between the first active material layer and the second active material layer. The first insulating shell and the second insulating shell are sealed together. The second bonding surface extends beyond the third bonding surface, exposing the first conductive layer on the third bonding surface to form a first tab; the fourth bonding surface extends beyond the first bonding surface, exposing the second conductive layer on the first bonding surface to form a second tab.
2. The ultra-thin sheet-like omnipolar energy storage element according to claim 1, characterized in that: Both the first insulating shell and the second insulating shell are made of insulating thermoplastic material.
3. The ultra-thin sheet-like omnipolar energy storage element according to claim 2, characterized in that: The first insulating shell has a first thermoplastic adhesive layer extending from the first bonding surface to the second bonding surface on its surface facing the second insulating shell, and the first conductive layer is fixed to the first bonding surface by the first thermoplastic adhesive layer.
4. The ultra-thin sheet-like omnipolar energy storage element according to claim 3, characterized in that: The second insulating shell has a second thermoplastic adhesive layer extending from the third bonding surface to the fourth bonding surface on its surface facing the first insulating shell, and the second conductive layer is fixed on the fourth bonding surface by the second thermoplastic adhesive layer.
5. The ultra-thin sheet-like omnipolar energy storage element according to claim 4, characterized in that: The first mating surface and the fourth mating surface are sealed by heat sealing.
6. The ultra-thin sheet-like omnipolar energy storage element according to claim 4, characterized in that: The second and third mating surfaces are sealed by heat sealing.
7. The ultra-thin sheet-like omnipolar energy storage element according to claim 2, characterized in that: The joint between the first insulating shell and the second insulating shell is sealed by heat sealing.
8. The ultra-thin sheet-like omnipolar energy storage element according to claim 1, characterized in that: A solid electrolyte layer is provided between the first electrode assembly and the second electrode assembly; the sum of the thicknesses of the first conductive layer, the first active material layer, the solid electrolyte layer, and the second active material layer is equal to the height of the first bending segment; the sum of the thicknesses of the first active material layer, the solid electrolyte layer, the second active material layer, and the second conductive layer is equal to the height of the second bending segment.
9. The ultra-thin sheet-like omnipolar energy storage element according to claim 1, characterized in that: A diaphragm is provided between the first electrode assembly and the second electrode assembly; the sum of the thicknesses of the first conductive layer, the first active material layer, the diaphragm, and the second active material layer is equal to the height of the first bent section; the sum of the thicknesses of the first active material layer, the diaphragm, the second active material layer, and the second conductive layer is equal to the height of the second bent section.