A battery with improved positive terminal structure
By setting radial and circumferential grooves on the positive electrode current collector of the lithium battery and setting welding ears on the edges, the problems of poor battery electrical connection and uneven liquid electrolyte injection are solved, and more efficient electrolyte distribution and current conduction are achieved, improving the capacity and safety of the battery.
Patent Information
- Application Number
- CN202421263379.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-04
AI Technical Summary
In the process of collecting and transferring electrical energy, existing lithium batteries have problems such as poor electrical connection, dummy welding and excessive resistance, resulting in reduced battery capacity and safety, and uneven injection of liquid electrolytes.
A battery with improved positive electrode terminal structure is designed. By providing multiple radial grooves and circumferential grooves on the positive electrode current collector and welding ears on the edges, uniform distribution of the electrolyte and good conduction of current is achieved.
It improves the uniformity of electrolyte injection, reduces welding difficulty and resistance thermal loss, and enhances the capacity and safety performance of the battery.
Smart Images
Figure CN222720620U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field related to secondary non-aqueous electrolyte cylindrical batteries, and in particular relates to a battery with an improved positive terminal structure. Background Art
[0002] With the development of electric vehicles and electrochemical energy storage technology, batteries, especially lithium-ion battery technology, as core components, are developing rapidly. Lithium batteries are generally composed of positive electrode materials, negative electrode materials and non-aqueous electrolytes. In order to pursue higher battery capacity and lower production costs, people have made a lot of improvements to the key components of lithium batteries and achieved great progress. However, after chemical energy is converted into electrical energy, it is necessary to face the problem of collecting and transmitting electrical energy. It is becoming increasingly important to collect current with low loss and reduce energy waste.
[0003] The current collector is one of the important components of the full-ear battery. It is used to lead the electric energy of the battery core to the positive or negative terminal of the battery. If the electrical connection between the current collector and the winding core is not good, or there are problems such as cold welding and excessive resistance, it will directly lead to a reduction in the capacity and safety of the battery. In addition, lithium batteries using liquid electrolytes are still the mainstream, which faces the problem of how to make the electrolyte injection fast and uniform. Utility Model Content
[0004] The purpose of the utility model is to provide a battery with an improved positive terminal structure. Through the special structural design of the current collector, the electrical connection ability between the current collector and the core is improved, and the manufacturing is convenient and the manufacturing difficulty is reduced. At the same time, the uniformity of electrolyte injection is improved, and it is suitable for large-capacity, high-power cylindrical lithium batteries.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] The utility model relates to a battery with an improved positive terminal structure, which comprises: a winding core, which is wound by a positive electrode sheet, a negative electrode sheet and a separator arranged between the positive electrode sheet and the negative electrode sheet; a core column, which penetrates the inside of the winding core to support the winding core; a battery shell, which is used to wrap the winding core and the electrolyte; and a battery shell cover, which is installed at the open end of the battery shell to close the battery shell;
[0007] A positive electrode current collector is arranged at one end of the winding core close to the battery shell cover. The positive electrode current collector is in the shape of a disc, and a plurality of radial grooves and circumferential grooves are arranged on the disc surface. The plurality of radial grooves and circumferential grooves are intersected and connected, and a plurality of liquid inlet holes are evenly distributed at the bottom of the radial grooves and the circumferential grooves. The positive electrode current collector also includes a plurality of welding ears arranged at the edge of the positive electrode current collector, and the welding ears are located between two adjacent radial grooves.
[0008] Through the above design, the positive electrode current collector is in the shape of a disk, and a plurality of radial grooves and circumferential grooves are arranged on the disk surface, the plurality of radial grooves and circumferential grooves are intersected and connected, and a plurality of liquid inlet holes are evenly distributed at the bottom of the radial grooves and circumferential grooves, so that the electrolyte can be evenly distributed on the current collector, avoiding the problem of uneven liquid injection when there is only a central liquid inlet hole; it also includes a plurality of welding ears arranged on the edge of the positive electrode current collector, the welding ear is located between two adjacent radial grooves, and the welding ear is arranged on the edge of the positive electrode current collector, and the welding ear is bent downward to be welded with the core positive electrode sheet, which simplifies the difficulty of the welding process, and at the same time, the large welding area of the welding ear is used to improve the conductivity of the electrical connection, so that the current is better conducted and collected. And because the welding part is not conventionally concentrated on the surface of the welding disk, the fluidity of the electrolyte is further improved, and the influence of welding on the injection is reduced.
[0009] Furthermore, there are four radial grooves extending from the center of the positive electrode current collector to its edge.
[0010] By extending a suitable number of radial grooves from the center of the positive electrode current collector to its edge, the uniformity of electrolyte injection is improved.
[0011] Furthermore, there are three circumferential grooves, which are concentric with the center of the positive electrode collector and are evenly arranged in the radial direction.
[0012] By having a suitable number of circumferential grooves that are concentric with the center of the positive electrode current collector and are evenly arranged in the radial direction, the uniformity of electrolyte injection is also improved.
[0013] Furthermore, the diameters of the multiple liquid inlet holes increase sequentially from the center to the edge of the positive electrode current collector.
[0014] The multiple liquid inlet holes that increase in size from the center to the edge of the positive electrode current collector improve the liquid inlet capacity on the edge side, making the electrolyte injection more uniform.
[0015] Furthermore, the plurality of radial grooves and the plurality of circumferential grooves have the same groove depth.
[0016] The plurality of radial grooves and the plurality of circumferential grooves are set to have the same groove depth, so that the electrolyte flows evenly, thereby improving the injection efficiency.
[0017] Furthermore, after the positive electrode current collector is assembled, the bottoms of the multiple radial grooves and the multiple circumferential grooves contact the positive electrode sheet, and the interference distance between the bottom of the groove and the top of the positive electrode sheet does not exceed one fifth of the groove depth.
[0018] The interference distance between the bottom of the multiple radial grooves and the multiple circumferential grooves and the top of the positive electrode sheet does not exceed one fifth of the groove depth, which reduces the deformation degree of the positive electrode sheet, thereby ensuring the conductivity and reducing the difficulty of installation.
[0019] Furthermore, the number of the multiple welding ears on the edge of the positive electrode current collector is 2-4.
[0020] Reasonable setting of the number of welding ears ensures a balance between conductivity and assembly difficulty.
[0021] Furthermore, the plurality of welding ears on the edge of the positive electrode current collector are evenly distributed along the circumferential direction.
[0022] The multiple welding ears that are evenly distributed can better collect the charges at different positions on the positive electrode sheet, thereby improving the current collecting capacity of the positive electrode current collector.
[0023] Furthermore, each welding ear is welded to the outermost circle of the positive electrode sheet after winding, and the total thickness after welding does not exceed 1.8 times the added thickness of the welding ear and the blank area of the positive electrode sheet.
[0024] Each welding ear is welded to the outermost circle of the positive electrode sheet after winding, which reduces the welding difficulty and facilitates the welding process. At the same time, the total thickness after welding does not exceed 1.8 times the added thickness of the welding ear and the blank area of the positive electrode sheet, which reduces the welding resistance, reduces the resistance heat loss, and improves the battery capacity.
[0025] Furthermore, the battery is a lithium-ion cylindrical battery.
[0026] The above-mentioned battery is more suitable for the manufacture and application of lithium-ion cylindrical batteries.
[0027] Compared with the prior art, the utility model provides a battery with an improved positive terminal structure, which has the following beneficial effects:
[0028] 1. A plurality of radial grooves and circumferential grooves are provided on the positive electrode current collector, and a plurality of liquid inlet holes are evenly distributed at the bottom of the radial grooves and the circumferential grooves, so that the electrolyte can be evenly distributed on the current collector, avoiding the problem of uneven liquid injection when there is only a central liquid inlet hole; a plurality of liquid inlet holes that increase in size from the center to the edge of the positive electrode current collector improve the liquid inlet capacity of the edge side, so that the electrolyte injection is more uniform.
[0029] 2. The welding ear is set at the edge of the positive electrode collector, and the welding ear is bent downward to be welded to the core positive electrode sheet, which simplifies the difficulty of the welding process. At the same time, the large welding area of the welding ear improves the conductivity of the electrical connection, so that the current is better conducted and collected. And because the welding part is not conventionally concentrated on the surface of the welding disk, the fluidity of the electrolyte is further improved, and the impact of welding on the injection is reduced. The interference distance between the bottom of the multiple radial grooves and the multiple circumferential grooves and the top of the positive electrode sheet does not exceed one-fifth of the groove depth, which reduces the deformation of the positive electrode sheet, ensuring the conductivity and reducing the difficulty of installation.
[0030] 3. Each welding ear is welded to the outermost circle of the positive electrode sheet after winding, which reduces the welding difficulty and facilitates the welding process. At the same time, the total thickness after welding does not exceed 1.8 times the added thickness of the welding ear and the blank area of the positive electrode sheet, which reduces the welding resistance, reduces the resistance heat loss, and increases the battery capacity. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 The utility model is a schematic diagram of the overall structure of a battery with an improved positive terminal structure.
[0032] Figure 2 It is a front view of a positive electrode current collector of a battery with an improved positive terminal structure according to the utility model.
[0033] Figure 3 The utility model is a cross-sectional view of a positive electrode current collector of a battery with an improved positive terminal structure.
[0034] Figure 4 The utility model is a schematic diagram of a positive electrode sheet of a battery with an improved positive terminal structure.
[0035] Figure 5 The utility model is a schematic diagram of a negative electrode sheet of a battery with an improved positive terminal structure.
[0036] Among them, in the figure: 1. Sealing pin; 2. Battery shell cover; 3. Winding core; 4. Positive electrode current collector; 5. Battery shell; 6. Core column; 7. Radial groove, circumferential groove; 8. Liquid inlet hole; 9. Welding ear; 10. Positive electrode sheet; 11. Positive electrode sheet blank area; 12. Positive electrode sheet coating area; 13. Negative electrode sheet; 14. Negative electrode sheet blank area; 15. Negative electrode sheet coating area. DETAILED DESCRIPTION
[0037] The following is a clear and explicit description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. The descriptions herein are merely exemplary embodiments, which are only for the purpose of illustration and are not intended to limit the scope of the present invention. Therefore, it should be understood that various modifications and variations may be made thereto without departing from the scope of the present invention.
[0038] like Figure 1-3As shown, the utility model is a battery with an improved positive terminal structure, including a winding core 3, which is wound by a positive electrode sheet, a negative electrode sheet and a separator arranged between the positive electrode sheet and the negative electrode sheet; a core column 6, which runs through the inside of the winding core 3 to support the winding core 3; a battery shell 5, which is used to wrap the winding core 3 and the electrolyte; a battery shell cover 2, which is installed at the open end of the battery shell 5 to close the battery shell 5; a positive electrode collector 4, which is arranged at one end of the winding core 3 close to the battery shell cover 2, and the positive electrode collector 4 is in the shape of a disk, and a plurality of radial grooves and circumferential grooves 7 are arranged on the disk surface, the plurality of radial grooves and the circumferential grooves 7 are intersected and connected, and a plurality of liquid inlet holes 8 are evenly distributed at the bottom of the radial grooves and the circumferential grooves 7, and also includes a plurality of welding ears 9 arranged at the edge of the positive electrode collector 4, and the welding ear 9 is located between two adjacent radial grooves.
[0039] like Figure 2 As shown, there are 3-4 radial grooves 7 extending from the center of the positive current collector 4 to its edge. There are 2-3 circumferential grooves 7, which are concentric with the center of the positive current collector 4 and are evenly arranged in the radial direction. The number of radial grooves and circumferential grooves should not be too many, otherwise it will affect the flow between the electrolyte and the core, and will also increase the difficulty of processing. At the same time, in order to evenly distribute the electrolyte on the entire end surface of the current collector, the number should not be too small. The multiple liquid inlet holes 8 increase in diameter from the center to the edge of the positive current collector 4. Of course, in order to reduce the difficulty of processing, multiple liquid inlet holes can also have the same diameter. It is preferred to set multiple liquid inlet holes 8 from the center to the edge of the positive current collector 4, and the aperture increases in diameter, so that the distal liquid inlet hole has a liquid inlet capacity equivalent to that of the proximal liquid inlet hole.
[0040] like Figure 3 As shown, the multiple radial grooves and the multiple circumferential grooves 7 have the same groove depth. After the positive electrode current collector 4 is assembled, the groove bottoms of the multiple radial grooves and the multiple circumferential grooves 7 contact the positive electrode sheet, and the interference distance between the groove bottom and the top of the positive electrode sheet does not exceed one-fifth of the groove depth. The radial grooves and the circumferential grooves 7 have the same groove depth, which is convenient for stamping manufacturing and makes the electrolyte flow more uniform, thereby improving the injection efficiency. The interference distance between the groove bottoms of the multiple radial grooves 7 and the multiple circumferential grooves 7 and the top of the positive electrode sheet does not exceed one-fifth of the groove depth, which reduces the deformation degree of the positive electrode sheet, that is, ensures the conductivity and reduces the difficulty of installation.
[0041] The number of the plurality of welding ears 9 on the edge of the positive electrode current collector 4 is 2-4.
[0042] The plurality of welding ears 9 on the edge of the positive electrode current collector 4 are evenly distributed along the circumferential direction.
[0043] Each welding ear 9 is welded to the outermost circle of the positive electrode sheet after winding, and the total thickness after welding does not exceed 1.8 times the thickness of the welding ear 9 and the blank area of the positive electrode sheet. Each welding ear is welded to the outermost circle of the positive electrode sheet after winding, which reduces the welding difficulty and facilitates the welding process. At the same time, the total thickness after welding does not exceed 1.8 times the thickness of the welding ear and the blank area of the positive electrode sheet, which reduces the welding resistance and reduces the resistance heat loss, which can effectively increase the battery capacity. It avoids problems such as cold welding and can also improve the safety performance of the battery.
[0044] like Figure 4-5 As shown, the positive electrode sheet 10 and the negative electrode sheet 13 are both foils that are easy to wind. Most of the areas of the positive electrode sheet 10 and the negative electrode sheet 13 are coated, and one end is left blank and uncoated for welding connection with the current collector; the battery is suitable for lithium-ion cylindrical batteries.
[0045] The utility model provides a battery with an improved positive terminal structure. The product has a simple manufacturing process and can better collect current during use, greatly reducing the resistance loss of the battery and greatly improving the performance of the lithium battery. At the same time, the utility model facilitates the injection of electrolyte and improves the uniformity of electrolyte injection.
Claims
1. A battery with an improved positive terminal structure, characterized in that: include: The winding core (3) is formed by winding a positive electrode sheet, a negative electrode sheet and a separator arranged between the positive electrode sheet and the negative electrode sheet; A core column (6) passing through the interior of the winding core (3) to support the winding core (3); A battery shell (5), used for wrapping the winding core (3) and the electrolyte; A battery case cover (2) mounted on the open end of the battery case (5) to close the battery case (5); A positive electrode current collector (4) is arranged at one end of the winding core (3) close to the battery shell cover (2), the positive electrode current collector (4) is in the shape of a disk, and a plurality of radial grooves and circumferential grooves (7) are arranged on the disk surface, the plurality of radial grooves and circumferential grooves (7) are intersecting and communicating with each other, a plurality of liquid inlet holes (8) are evenly distributed at the bottom of the radial grooves and the circumferential grooves (7), and also includes a plurality of welding ears (9) arranged at the edge of the positive electrode current collector (4), and the welding ears (9) are located between two circumferentially adjacent radial grooves.
2. A battery with an improved positive terminal structure according to claim 1, characterized in that: There are four radial grooves extending from the center of the positive electrode current collector (4) to its edge.
3. A battery with an improved positive terminal structure according to claim 2, characterized in that: There are three circumferential grooves (7), which are concentric with the center of the positive electrode current collector (4) and are evenly arranged in the radial direction.
4. A battery with an improved positive terminal structure according to claim 3, characterized in that: The diameters of the multiple liquid inlet holes (8) increase sequentially from the center to the edge of the positive electrode current collector (4).
5. A battery with an improved positive terminal structure according to claim 3, characterized in that: The plurality of radial grooves and the plurality of circumferential grooves (7) have the same groove depth.
6. A battery with an improved positive terminal structure according to claim 5, characterized in that: After the positive electrode current collector (4) is assembled, the groove bottoms of the plurality of radial grooves and the plurality of circumferential grooves (7) contact the positive electrode sheet, and the interference distance between the groove bottom and the top of the positive electrode sheet does not exceed one fifth of the groove depth.
7. A battery with an improved positive terminal structure according to claim 1, characterized in that: The number of the plurality of welding ears (9) on the edge of the positive electrode current collector (4) is 2-4.
8. A battery with an improved positive terminal structure according to claim 7, characterized in that: The plurality of welding ears (9) on the edge of the positive electrode current collector (4) are evenly distributed along the circumferential direction.
9. A battery with an improved positive terminal structure according to claim 8, characterized in that: Each welding ear (9) is welded to the outermost circle of the positive electrode sheet after winding, and the total thickness after welding does not exceed 1.8 times the added thickness of the welding ear (9) and the blank area of the positive electrode sheet.
10. A battery with an improved positive terminal structure according to any one of claims 1 to 9, characterized in that: The battery is a lithium-ion cylindrical battery.