A cylindrical battery

Abstract

The utility model discloses a cylindrical battery, is equipped with the roll core in the casing, and the roll core two ends are connected with positive current collector disc and negative current collector disc respectively, and the negative current collector disc is connected with screw pole post, and the screw pole post insulation penetrates to the casing outside and is connected with the nut, and the positive current collector disc is connected with the casing, and the roll core includes a plurality of roll core monomer, and a plurality of roll core monomers are formed by the lamination of one positive plate, one diaphragm and one negative plate and are wound in the roll core lining, and the adjacent two roll core monomers are roll core series connection area, and the positive plate's tab area, the tab area of negative plate and roll core series connection area all are equipped with a plurality of pinholes, and the side wall of roll core lining is equipped with a plurality of lining holes. Advantageous effects: the utility model integrates multiple roll core monomers in single cylindrical battery, forms the inner series formula big cylindrical battery, improves the capacity and energy density of single cylindrical battery. Without setting up roll core connecting piece, setting up roll core lining supports roll core, and the setting of pinhole and lining hole is favorable to the circulation of electrolyte.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical battery technology, and specifically to a cylindrical battery. Background Technology

[0002] Traditional cylindrical batteries initially dominated the consumer electronics and electric vehicle markets due to their high standardization and flexible assembly capabilities. However, traditional cylindrical batteries are typically single-cell structures with small capacities. As new energy vehicles demand higher energy density, faster charging performance, and lower system costs, single cylindrical cells can no longer meet power requirements. Multiple cylindrical cells need to be connected in series to form a battery pack. During assembly, the positive and negative electrodes of each cell must be welded together using connectors. This welding process is prone to problems such as explosions and incomplete soldering, increasing the difficulty of assembly. Furthermore, the inner ring of the cell's central hole can collapse in the later stages of cycling, leading to lithium plating and even a drop in electrolyte levels. Moreover, after the positive and negative electrode tabs are flattened, this area becomes relatively dense, and the electrolyte can only diffuse into the core through these tabs, increasing the difficulty of diffusion. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a cylindrical battery that integrates multiple wound core cells within a single cylindrical cell to form an internally connected large cylindrical battery, thereby improving the capacity and energy density of the single cylindrical cell. The multiple wound core cells are formed by stacking and winding a positive electrode sheet, a separator, and a negative electrode sheet, eliminating the need for core connectors. A core liner is located at the center of the core to support the entire core. Furthermore, several holes are formed in the negative electrode tab area, the positive electrode tab area, the core liner, and the core series connection area to facilitate electrolyte flow.

[0004] The purpose of this utility model is achieved through the following technical measures: A cylindrical battery, comprising: a housing, a core disposed inside the housing, a positive current collector and a negative current collector respectively connected to both ends of the core, a screw terminal connected to the negative current collector, the screw terminal extending through insulation to the outside of the housing and connected to a nut on the outside of the housing, the positive current collector connected to the housing, the core comprising multiple core units, the multiple core units being spaced apart along the axial direction of the cylindrical battery, the multiple core units being formed by stacking a positive electrode sheet, a separator and a negative electrode sheet and winding them around the core liner, the area between two adjacent core units being a core series connection area, the tab area of ​​the positive electrode sheet, the tab area of ​​the negative electrode sheet and the core series connection area are all provided with several pinholes, and the side wall of the core liner is provided with several liner holes.

[0005] In some embodiments, the positive electrode sheet includes a plurality of positive electrode coating areas spaced apart along the width direction of the positive electrode sheet, and an uncoated area is formed between two adjacent positive electrode coating areas. The negative electrode sheet is arranged correspondingly to the positive electrode sheet. When the positive electrode sheet, the negative electrode sheet and the separator are wound into a core, each positive electrode coating area corresponds to a core unit and each uncoated area corresponds to a core series area.

[0006] In some embodiments, the ratio of the total pore area on the positive electrode and the negative electrode to the total area of ​​the uncoated area of ​​the electrode is 1-10%.

[0007] In some embodiments, the height of the core serial connection area is 1-30mm.

[0008] In some embodiments, the aperture of the pinhole is 1-100 μm.

[0009] In some embodiments, the length of the core is 10-1200 mm.

[0010] In some embodiments, the diameter of the core is 10-110 mm.

[0011] In some embodiments, the ratio of the total hole area of ​​the core liner to the side surface area of ​​the core liner is 1-10%.

[0012] In some embodiments, the diameter of the liner hole is 1-5 mm.

[0013] In some embodiments, a sealing ring is provided between the screw post and the housing, an upper insulating sheet is provided between the nut and the housing, and a lower insulating sheet is provided between the negative current collector and the housing.

[0014] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention integrates multiple wound core cells within a single cylindrical battery, forming an internally connected large cylindrical battery, thereby improving the capacity and energy density of the single cylindrical battery. The multiple wound core cells are formed by stacking and winding a positive electrode sheet, a separator, and a negative electrode sheet, eliminating the need for core connectors. A core liner is placed at the center of the core, providing support and preventing collapse of the inner core during later cycles. Furthermore, several liner holes are provided in the core liner to facilitate electrolyte flow. Several pinholes are provided in the negative and positive electrode tab areas, allowing electrolyte to diffuse into the core even after the core tabs are flattened. An uncoated core series connection area is provided, with several pinholes in this area. This core series connection area can store a large amount of electrolyte, ensuring sufficient electrolyte levels during later cycles. Electrolyte can permeate through the pinholes on the positive and negative electrodes, promoting electrolyte flow. In addition, the heat generated by the individual core cells can be transferred to the core series connection area and released through the core series connection area, improving the battery's safety performance.

[0015] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0016] Figure 1 This is an exploded view of the structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the core structure.

[0018] Figure 3 This is a schematic diagram of the inner lining of the core.

[0019] Figure 4 This is a schematic diagram of the positive electrode.

[0020] Among them, 1. Nut, 2. Upper insulating sheet, 3. Housing body, 4. Lower insulating sheet, 5. Negative current collector, 6. Screw pole, 7. Core, 8. Positive current collector, 9. Sealing sheet, 10. Cover plate, 11. Core unit, 12. Negative electrode lug area, 13. Core series connection area, 14. Positive electrode lug area, 15. Core liner, 16. Positive electrode coated area, 17. Uncoated area. Detailed Implementation

[0021] like Figures 1 to 4As shown, a cylindrical battery includes: a casing, a core 7 inside the casing, with a positive current collector 8 and a negative current collector 5 connected to its two ends respectively. A screw terminal 6 is connected to the negative current collector 5, extending through the casing and connected to a nut 1 on the outside of the casing. The positive current collector 8 is connected to the casing. The core 7 includes multiple core units 11, spaced apart along the axial direction of the cylindrical battery. Each core unit 11 is formed by stacking a positive electrode sheet, a separator, and a negative electrode sheet and winding them around a core liner 15. A core series connection area 13 is formed between adjacent core units 11. The tab areas of the positive and negative electrodes and the core series connection area 13 are all provided with several pinholes. Several liner holes are provided on the sidewall of the core liner 15. This invention integrates multiple core units 11 within a single cylindrical battery, forming an internally connected large cylindrical battery, thereby improving the capacity and energy density of the single cylindrical battery. Multiple core cells 11 are formed by stacking and winding a positive electrode sheet, a separator, and a negative electrode sheet, eliminating the need for core connectors. A core liner 15 is located at the center of the core 7, providing support and preventing the inner ring of the core 7 from collapsing during later cycles. The core liner 15 also has several liner holes to facilitate electrolyte flow. Several pinholes are provided in the negative electrode tab area 12 and the positive electrode tab area 14, allowing electrolyte to diffuse into the core 7 even after the tabs are flattened. An uncoated core series connection area 13 is provided, with several pinholes. This area can store a large amount of electrolyte, ensuring sufficient electrolyte levels during later cycles. Electrolyte can permeate through the pinholes on the positive and negative electrodes, promoting electrolyte flow. Furthermore, the heat generated by the core cells 11 can be transferred to and released through the core series connection area 13, improving battery safety.

[0022] In some embodiments, the positive electrode sheet includes a plurality of positive electrode coating areas 16 spaced apart along the width direction of the positive electrode sheet. The positive electrode sheet is wound along its length direction, and an uncoated area 17 is formed between two adjacent positive electrode coating areas 16. The negative electrode sheet is disposed correspondingly to the positive electrode sheet. The negative electrode sheet includes a plurality of negative electrode coating areas spaced apart along the width direction of the negative electrode sheet. The negative electrode sheet is wound along its length direction, and an uncoated area 17 is formed between two adjacent negative electrode coating areas. When the positive electrode sheet, negative electrode sheet, and separator are wound into a core 7, each positive electrode coating area 16 corresponds to a core unit 11, and each uncoated area 17 corresponds to a core series region 13.

[0023] In some embodiments, the ratio of the total pore area on the positive electrode and the negative electrode to the total area of ​​the uncoated area of ​​the electrode is 1-10%.

[0024] In some embodiments, the height of the core series connection region 13 is 1-30 mm. Matching the height range of the core series connection region 13 with the height range of the positive and negative electrodes avoids energy density loss and promotes electrolyte storage.

[0025] In some embodiments, the pinhole diameter is 1-100 μm, which facilitates the flow of electrolyte while ensuring structural support for the winding core. Furthermore, the pinhole can be formed by rolling during a rolling process.

[0026] In some embodiments, the length of the winding core 7 is 10-1200 mm. Specifically, the maximum length of the winding core 7 can reach the maximum length of the vehicle system battery module.

[0027] In some embodiments, the diameter of the winding core 7 is 10-110 mm. Specifically, the maximum diameter of the winding core 7 can reach the maximum height of the vehicle system battery module.

[0028] In some embodiments, the ratio of the total hole area of ​​the core liner 15 to the side surface area of ​​the core liner 15 is 1-10%.

[0029] In some embodiments, the diameter of the liner hole is 1-5 mm.

[0030] In some embodiments, a sealing ring is provided between the screw post 6 and the housing, an upper insulating sheet 2 is provided between the nut 1 and the housing, and a lower insulating sheet 4 is provided between the negative current collector 5 and the housing.

[0031] In some embodiments, the positive electrode current collector 8 is provided with a liquid injection hole, which is sealed by a sealing sheet 9.

[0032] In some embodiments, the housing includes a housing body 3 and a cover plate 10, the cover plate 10 being used to seal the housing body 3.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] Furthermore, in the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0037] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A cylindrical battery, characterized in that, The device includes: a housing, a core inside the housing, a positive current collector and a negative current collector connected to both ends of the core, a screw terminal connected to the negative current collector, the screw terminal extending through insulation to the outside of the housing and connected to a nut on the outside of the housing, the positive current collector connected to the housing, the core comprising multiple core units spaced apart along the axial direction of the cylindrical battery, the multiple core units being formed by stacking a positive electrode sheet, a separator and a negative electrode sheet and winding them around the core liner, the area between two adjacent core units being a core series connection area, the tab area of ​​the positive electrode sheet, the tab area of ​​the negative electrode sheet and the core series connection area all having several pinholes, and the side wall of the core liner having several liner holes.

2. The cylindrical battery according to claim 1, characterized in that: The positive electrode sheet includes multiple positive electrode coating areas spaced apart along the width direction of the positive electrode sheet, and an uncoated area is formed between two adjacent positive electrode coating areas. The negative electrode sheet is arranged correspondingly to the positive electrode sheet. When the positive electrode sheet, negative electrode sheet and separator are wound into a core, each positive electrode coating area corresponds to a core unit, and each uncoated area corresponds to a core series area.

3. The cylindrical battery according to claim 1, characterized in that: The ratio of the total pore area on both the positive and negative electrode sheets to the total area of ​​the uncoated area of ​​the electrode sheet is 1-10%.

4. The cylindrical battery according to claim 1, characterized in that: The height of the core series connection area is 1-30mm.

5. The cylindrical battery according to claim 1, characterized in that: The diameter of the pinhole is 1-100 μm.

6. The cylindrical battery according to claim 1, characterized in that: The length of the core is 10-1200mm.

7. The cylindrical battery according to claim 1, characterized in that: The diameter of the core is 10-110 mm.

8. The cylindrical battery according to claim 1, characterized in that: The ratio of the total hole area of ​​the core liner to the side surface area of ​​the core liner is 1-10%.

9. The cylindrical battery according to claim 1, characterized in that: The diameter of the lining hole is 1-5mm.

10. The cylindrical battery according to claim 1, characterized in that: A sealing ring is provided between the screw post and the housing, an upper insulating sheet is provided between the nut and the housing, and a lower insulating sheet is provided between the negative current collector and the housing.

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