Battery roll core and battery
By using conductive rods instead of winding needles, the problem of large battery core diameter is solved, resulting in a reduction in battery core diameter and an improvement in production efficiency. This technology is suitable for products such as small appliances and automobiles.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN UTILITY ENERGY CO LTD
- Filing Date
- 2025-06-25
- Publication Date
- 2026-06-23
AI Technical Summary
Existing battery cores have a large diameter, making them unsuitable for products that require smaller sizes, such as capacitive pens.
By using a first conductive rod and a second conductive rod to replace the traditional winding needle, the electrode sheet and separator do not need to be unwound after winding. The diameter of the conductive rod can be smaller than that of the traditional winding needle, forming a battery core with a smaller diameter.
This technology enables a reduction in the diameter of the battery core, simplifies the winding process, improves production efficiency, and makes the battery suitable for products such as small appliances and automobiles.
Smart Images
Figure CN224400404U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of battery technology, specifically relating to a battery core and a battery. Background Technology
[0002] Battery cores are typically formed by rotating the electrodes and separators using a winding needle in a battery winding machine. After the electrodes and separators are wound, the winding needle needs to be removed from them, which requires considerable force. To ensure the strength of the winding needle, it needs to have a large diameter, resulting in a large diameter battery core formed after the electrodes and separators are wound on the needle. Utility Model Content
[0003] The purpose of this application is to provide a battery core and a battery to solve the technical problem of large diameter battery cores in the prior art.
[0004] To achieve the above objectives, an embodiment of the first aspect of this application provides a battery core, comprising: a first electrode, the first electrode including a first current collector and a first active material layer disposed on the first current collector; a second electrode, having the opposite polarity to the first electrode; the second electrode including a second current collector and a second active material layer disposed on the second current collector; a separator disposed between the first electrode and the second electrode; a first conductive rod extending along the width direction of the first electrode and electrically connected to the winding start end of the first current collector; a second conductive rod extending along the width direction of the first electrode and electrically connected to the winding start end of the second current collector; the second conductive rod and the first conductive rod being spaced apart along the width direction of the first electrode; the first electrode, the separator, and the second electrode being wound around the first conductive rod and the second conductive rod.
[0005] In some embodiments, the second conductive rod and the first conductive rod are located at the same position along the length of the first electrode.
[0006] In some embodiments, in the direction perpendicular to the first conductive rod, the maximum dimensions of the first conductive rod and the second conductive rod are 0.5mm-1.5mm, respectively.
[0007] In some embodiments, the first conductive rod and the first active material layer are spaced apart on the surface of the first current collector; and / or, the second conductive rod and the second active material layer are spaced apart on the surface of the second current collector.
[0008] In some embodiments, the first conductive rod and the second conductive rod are spaced 2mm-5mm apart along the length of the first conductive rod.
[0009] In some embodiments, a first conductive rod extends out of a first current collector and forms a first tab; and / or, a second conductive rod extends out of a second current collector and forms a second tab.
[0010] In some embodiments, the lengths of the first conductive rod and the second conductive rod are equal.
[0011] In some embodiments, the first electrode includes two layers of first active material located on both sides of the first current collector; two second electrodes and two diaphragms are respectively provided, the two second electrodes are respectively connected to the side of the two diaphragms away from the first active material layer, and the two second current collectors of the two second electrodes are in contact with each other.
[0012] In some embodiments, the two diaphragms are an integral structure, and one end of the two diaphragms is connected along their own length direction; and / or, the two second current collectors in the two second electrodes are an integral structure, and one end of the two second current collectors is connected along their own length direction.
[0013] An embodiment of the second aspect of this application also provides a battery, including a housing and at least one battery core as described in the first aspect embodiment, the battery core being located within the housing.
[0014] The beneficial effects of the battery core and battery provided in this application are as follows: the first and second conductive rods can replace the winding needle, and after the first electrode, separator, and second electrode are wound onto the first and second conductive rods, it is not necessary to remove the first and second conductive rods. Therefore, the first and second conductive rods do not need to be subjected to large forces, and their diameters can be smaller than those of traditional winding needles. The first electrode, separator, and second electrode can be wound to form a battery core with a smaller diameter. The embodiments of this application can solve the technical problem of a large battery core diameter. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the structure of a battery core provided in some embodiments of this application;
[0017] Figure 2 Schematic diagram of the unfolded state of the battery core provided in some embodiments of this application Figure 1 ;
[0018] Figure 3 Schematic diagram of the unfolded state of the battery core provided in some embodiments of this application Figure 2 .
[0019] The following are the labeling elements in the figure:
[0020] 100. Battery winding core;
[0021] 10. First electrode; 11. First current collector; 12. First active material layer;
[0022] 20. Second electrode; 21. Second current collector; 22. Second active material layer;
[0023] 30. Diaphragm;
[0024] 40. First conductive rod; 41. First electrode tab;
[0025] 50. Second conductive rod; 51. Second electrode tab. Detailed Implementation
[0026] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0028] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0030] Existing lithium-ion and sodium-ion batteries typically use winding and stacking methods to manufacture the core. Winding requires using a needle to wind and shape the electrode and separator. Since the needle needs to withstand a certain amount of external force, its rigidity and toughness must be sufficient; otherwise, it is prone to breakage, affecting production efficiency. Therefore, the diameter of the needle is generally above 3mm, corresponding to a core diameter of typically above 5mm. For products such as capacitive pens on the market, which require battery diameters of 4mm, 3mm, or smaller, existing batteries are difficult to adapt to these products.
[0031] To address the aforementioned issues, this application provides a battery core in which a first and second conductive rod connected to the electrode sheet replaces the winding needle. After the electrode sheet and separator are wound and formed, the needle does not need to be removed. Therefore, the diameters of the first and second conductive rods can be smaller than the diameter of the traditional winding needle, thus solving the technical problem of a large diameter battery core.
[0032] An embodiment of the first aspect of this application provides a battery core that can be used to provide electrical energy in products such as electrical appliances and automobiles.
[0033] Please refer to Figures 1 to 3 The battery core 100 of this application embodiment includes a first electrode 10, a second electrode 20, a separator 30, a first conductive rod 40, and a second conductive rod 50. The first electrode 10 includes a first current collector 11 and a first active material layer 12 disposed on the first current collector 11. The second electrode 20 has the opposite polarity to the first electrode 10; the second electrode 20 includes a second current collector 21 and a second active material layer 22 disposed on the second current collector 21. The separator 30 is disposed between the first electrode 10 and the second electrode 20. The first conductive rod 40 extends along the width direction Y of the first electrode 10 and is electrically connected to the winding start end of the first current collector 11. The second conductive rod 50 extends along the width direction Y of the first electrode 10 and is electrically connected to the winding start end of the second current collector 21; the second conductive rod 50 and the first conductive rod 40 are spaced apart along the width direction Y of the first electrode 10. The first electrode 10, the diaphragm 30, and the second electrode 20 are wound around the first conductive rod 40 and the second conductive rod 50.
[0034] The battery core 100 achieves charging or discharging by the movement of ions between the positive and negative electrode plates. During charging, ions move from the positive electrode plate to the negative electrode plate, and during discharging, ions move from the negative electrode plate to the positive electrode plate.
[0035] One of the first electrode 10 and the second electrode 20 is a positive electrode, and the other is a negative electrode. Optionally, the first electrode 10 can be a positive electrode, the first current collector 11 is a positive current collector, and the first active material layer 11 is a positive active material; then the second electrode 20 is a negative electrode, the second current collector 21 is a negative current collector, and the second active material layer 22 is a negative active material. Optionally, the first electrode 10 can also be a negative electrode, the first current collector 11 is a negative current collector, and the first active material layer 12 is a negative active material; then the second electrode 20 is a positive electrode, the second current collector 21 is a positive current collector, and the second active material layer 22 is a positive active material.
[0036] Optionally, the positive electrode current collector can be aluminum foil. Optionally, the positive electrode active material can be lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, etc. Optionally, the negative electrode current collector can be copper foil, copper foam, etc. Optionally, the negative electrode active material can be graphite, silicon suboxide, etc.
[0037] Along the thickness direction Z of the first electrode 10, a separator 30 is disposed between adjacent first electrode 10s and second electrode 20s, separating the first electrode 10s and second electrode 20s. The separator 30 is an insulating membrane, preventing short circuits between the first electrode 10s and second electrode 20s. The separator 30 also allows ions to pass through it and move between the first electrode 10s and second electrode 20s. The first active material layer 12 and the second active material layer 22 are respectively located on two surfaces of a separator 30 along its own thickness direction. Optionally, the material of the separator 30 can be polyethylene, polypropylene, etc. Optionally, the separator 30 can be a gel separator, which has low thermal conductivity and high temperature resistance.
[0038] The length direction of the second electrode 20 and the length direction of the diaphragm 30 are the same as the length direction X of the first electrode 10. The width direction of the second electrode 20 and the width direction of the diaphragm 30 are the same as the width direction Y of the first electrode 10. The thickness direction of the second electrode 20 and the thickness direction of the diaphragm 30 are the same as the thickness direction Z of the first electrode 10.
[0039] The length direction of the first conductive rod 40 is the width direction Y of the first electrode 10. The first conductive rod 40 is connected to one side of the first current collector 11 along its thickness direction. The first conductive rod 40 is electrically connected to the first current collector 11 and can conduct electricity between the first current collector 11 and the external circuit of the battery core 100. Optionally, a tab can be connected to one end of the first conductive rod 40 near the edge of the first current collector 11 along its length direction. Optionally, the material of the first conductive rod 40 can be aluminum, nickel, etc. Optionally, the first conductive rod 40 can be welded to the first current collector 11, and the connection between the first conductive rod 40 and the first current collector 11 is stable and conductive. Optionally, the first conductive rod 40 can be cylindrical, prismatic, etc.
[0040] The first current collector 11 is the first end of the first current collector 11 along its own winding direction, and also one end of the first current collector 11 along its own length direction; the first current collector 11 is located in the middle of the battery core 100 along its own thickness direction, and the thickness direction of the battery core 100 is perpendicular to the length direction of the first conductive rod 40.
[0041] The second conductive rod 50 has the same length direction as the first conductive rod 40. The second conductive rod 50 is connected to one side of the second current collector 21 along its thickness direction. The second conductive rod 50 is electrically connected to the second current collector 21, enabling it to conduct electricity between the second current collector 21 and the external circuitry of the battery core 100. Optionally, a tab can be connected to one end of the second conductive rod 50 near the edge of the second current collector 21 along its length direction. Optionally, the material of the second conductive rod 50 can be aluminum, nickel, etc. Optionally, the second conductive rod 50 can be welded to the second current collector 21, ensuring a stable connection and conductivity between the two. The cross-sectional shape of the second conductive rod 50 perpendicular to its length direction is the same as that of the first conductive rod 40 perpendicular to its length direction. Optionally, the second conductive rod 50 can be a cylindrical structure, a prism structure, etc.
[0042] The starting end of the winding of the second current collector 21 is the first end of the second current collector 21 along its own winding direction, and also one end of the second current collector 21 along its own length direction; the starting end of the winding of the second current collector 21 is located in the middle of the battery core 100 along its own thickness direction.
[0043] The second conductive rod 50 and the first conductive rod 40 are spaced apart along their own length direction. The end of the second conductive rod 50 away from the first conductive rod 40 along its own length direction is close to the edge of the second current collector 21, and the end of the first conductive rod 40 away from the second conductive rod 50 along its own length direction is close to the edge of the first current collector 11.
[0044] The winding start ends of the first current collector 11, the second current collector 21, and the diaphragm 30 are located close to each other. That is, the entire first conductive rod 40 and the second conductive rod 50 are located at the winding start end of the entire first electrode 10, the second electrode 20, and the diaphragm 30. The first electrode 10, the diaphragm 30, and the second electrode 20 are wound around the entire first conductive rod 40 and the second conductive rod 50.
[0045] Optionally, on a plane perpendicular to the length direction of the first conductive rod 40, the orthographic projections of the first conductive rod 40 and the second conductive rod 50 at least partially overlap, the maximum dimension of the first conductive rod 40 and the second conductive rod 50 as a whole in the direction perpendicular to their own length is smaller, and the thickness of the battery core 100 is smaller.
[0046] When manufacturing the battery core 100, the first conductive rod 40 is fixed to the first current collector 11, and the second conductive rod 50 is fixed to the second current collector 21. Then, the first electrode 10, the separator 30, and the second electrode 20 are stacked together, and the first conductive rod 40 and the second conductive rod 50 are pushed closer to each other along the thickness direction of the separator 30; finally, the first electrode 10, the separator 30, and the second electrode 20 are wound around the first conductive rod 40 and the second conductive rod 50.
[0047] The beneficial effects of this application's embodiments are as follows: the first conductive rod 40 and the second conductive rod 50 can replace the winding needle. After the first electrode 10, the separator 30, and the second electrode 20 are wound onto the first conductive rod 40 and the second conductive rod 50, it is not necessary to remove the first conductive rod 40 and the second conductive rod 50. Therefore, the first conductive rod 40 and the second conductive rod 50 do not need to be subjected to large forces, and their diameters can be smaller than those of traditional winding needles. After the first electrode 10, the separator 30, and the second electrode 20 are wound, a battery core 100 with a smaller diameter can be formed. This application's embodiments can solve the technical problem of a large battery core diameter.
[0048] In some embodiments, the first electrode 10, the diaphragm 30, and the second electrode 20 are fixed together, resulting in greater stability during winding. Optionally, the first electrode 10, the diaphragm 30, and the second electrode 20 can be fixed by hot pressing.
[0049] The first electrode 10, separator 30, and second electrode 20 are fixed together, facilitating manual winding of the first electrode 10, separator 30, and second electrode 20. This eliminates the need for winding needles on a large winding machine, simplifying the process. Furthermore, manual winding reduces the force on the first conductive rod 40 and second conductive rod 50, allowing for a smaller diameter diameter of the first conductive rod 40 and second conductive rod 50. This results in a smaller diameter battery core 100 formed after winding the first electrode 10, separator 30, and second electrode 20. It is understood that the winding process is not limited to manual winding; appropriate winding equipment can also be used.
[0050] In some embodiments, please refer to Figure 2 and Figure 3 Along the length direction X of the first electrode 10, the second conductive rod 50 and the first conductive rod 40 are located at the same position.
[0051] Along the length X of the first electrode 10, the greater the distance between the first conductive rod 40 and the second conductive rod 50, the larger the overall size of the first conductive rod 40 and the second conductive rod 50, and thus the larger the size of the battery core 100 in the direction of the distance between the first conductive rod 40 and the second conductive rod 50. If the second conductive rod 50 and the first conductive rod 40 are located at the same position along the length X of the first electrode 10, then the size of the first conductive rod 40 and the second conductive rod 50 in a direction perpendicular to their own length is smaller, resulting in a smaller size of the battery core 100 in that direction and a smaller volume of the battery core 100.
[0052] In some embodiments, please refer to Figure 2 and Figure 3 In the direction perpendicular to the first conductive rod 40, the maximum dimensions of the first conductive rod 40 and the second conductive rod 50 are 0.5mm and 1.5mm, respectively.
[0053] The direction perpendicular to the first conductive rod 40 refers to multiple directions perpendicular to the length direction of the first conductive rod 40. Optionally, when the first conductive rod 40 and the second conductive rod 50 are cylindrical structures, in the multiple directions perpendicular to the first conductive rod 40, the maximum dimension of the first conductive rod 40 is its diameter, and the maximum dimension of the second conductive rod 50 is its diameter. Optionally, when the first conductive rod 40 and the second conductive rod 50 are both quadrangular prism structures, in the multiple directions perpendicular to the first conductive rod 40, the maximum dimension of the first conductive rod 40 is the diagonal dimension of its cross-section perpendicular to its own length, and the maximum dimension of the second conductive rod 50 is the diagonal dimension of its cross-section perpendicular to its own length.
[0054] If the maximum dimensions of the first conductive rod 40 and the second conductive rod 50 are less than 0.5 mm in the direction perpendicular to the first conductive rod 40, then the strength of the first conductive rod 40 and the second conductive rod 50 is low, and they are easily damaged. If the maximum dimensions of the first conductive rod 40 and the second conductive rod 50 are greater than 1.5 mm in the direction perpendicular to the length of the first conductive rod 40, then the battery core 100 has a larger dimension in the direction perpendicular to the length of the first conductive rod 40.
[0055] Optionally, in the direction perpendicular to the first conductive rod 40, the maximum dimensions of the first conductive rod 40 and the second conductive rod 50 can be 0.5 mm, resulting in a smaller dimension of the battery core 100 in the direction perpendicular to the length of the first conductive rod 40. Optionally, in the direction perpendicular to the first conductive rod 40, the maximum dimensions of the first conductive rod 40 and the second conductive rod 50 can also be 1.5 mm, resulting in higher strength and less susceptibility to damage for both the first conductive rod 40 and the second conductive rod 50. Optionally, in the direction perpendicular to the first conductive rod 40, the maximum dimensions of the first conductive rod 40 and the second conductive rod 50 can also be 0.6 mm, 1 mm, 1.3 mm, etc.
[0056] The beneficial effects of this application embodiment are that, in the direction perpendicular to the first conductive rod 40, the maximum size of the first conductive rod 40 and the maximum size of the second conductive rod 50 are limited to the above range, which can both ensure the strength of the first conductive rod 40 and the second conductive rod 50, and make the battery core 100 smaller in size in the direction perpendicular to the length direction of the first conductive rod 40.
[0057] In some embodiments, please refer to Figure 2 The first conductive rod 40 and the first active material layer 12 are spaced apart on the surface of the first current collector 11. That is, the first conductive rod 40 and the first active material layer 12 are located on the same surface of the first current collector 11 along its thickness direction, and are spaced apart on this surface. Optionally, the first conductive rod 40 and the first active material layer 12 are spaced apart on the surface of the first current collector 11 along the length direction of the first current collector 11, and the portion of the first current collector 11 between the first conductive rod 40 and the first active material layer 12 can contact the first conductive rod 40 and conduct electricity.
[0058] The beneficial effect of this application embodiment is that: the first conductive rod 40 and the first active material layer 12 are spaced apart on the surface of the first current collector 11, which can prevent the first active material layer 12 from affecting the electrical connection between the first conductive rod 40 and the first current collector 11.
[0059] In some embodiments, please refer to Figure 2 The second conductive rod 50 and the second active material layer 22 are spaced apart on the surface of the second current collector 21. That is, the second conductive rod 50 and the second active material layer 22 are located on the same surface of the second current collector 21 along its thickness direction, and are spaced apart on this surface. Optionally, the second conductive rod 50 and the second active material layer 22 are spaced apart on the surface of the second current collector 21 along the length direction of the second current collector 21, and the portion of the second current collector 21 between the second conductive rod 50 and the second active material layer 22 can contact and conduct electricity with the second conductive rod 50.
[0060] The beneficial effect of this application embodiment is that the second conductive rod 50 and the second active material layer 22 are spaced apart on the surface of the second current collector 21, which can prevent the second active material layer 22 from affecting the electrical connection between the second conductive rod 50 and the second current collector 21.
[0061] In some embodiments, please refer to Figure 2 The first conductive rod 40 and the first active material layer 12 are disposed at a distance from each other on the surface of the first current collector 11. The second conductive rod 50 and the second active material layer 22 are disposed at a distance from each other on the surface of the second current collector 21.
[0062] In some embodiments, please refer to Figure 2 and Figure 3 Along the length of the first conductive rod 40, the first conductive rod 40 and the second conductive rod 50 are spaced 2mm-5mm apart.
[0063] Before winding the first electrode 10, the diaphragm 30, and the second electrode 20, the first conductive rod 40 and the second conductive rod 50 are completely offset along the thickness direction of the diaphragm 30, resulting in a relatively large overall size of the first conductive rod 40 and the second conductive rod 50 along the thickness direction of the diaphragm 30. To reduce the overall size of the first conductive rod 40 and the second conductive rod 50 along the thickness direction of the diaphragm 30, it is necessary to push the first conductive rod 40 and the second conductive rod 50 closer together along the thickness direction of the diaphragm 30, making them closer together or located at the same position. When pushing the first conductive rod 40 and the second conductive rod 50 closer together along the thickness direction of the diaphragm 30, the diaphragm 30 between the first conductive rod 40 and the second conductive rod 50 is stretched. If the size of the diaphragm 30 between the first conductive rod 40 and the second conductive rod 50 is less than 2 mm along the length direction of the first conductive rod 40 and the second conductive rod 50, the diaphragm 30 is prone to breakage after being stretched.
[0064] In the length direction of the first conductive rod 40 and the second conductive rod 50, if the size of the diaphragm 30 between the first conductive rod 40 and the second conductive rod 50 is greater than 5 mm, then the space between the first conductive rod 40 and the second conductive rod 50 is relatively large. During the winding process, the first electrode 10, the diaphragm 30, and the second electrode 20 are easily deformed into the space between the first conductive rod 40 and the second conductive rod 50 after being squeezed.
[0065] Optionally, the first conductive rod 40 and the second conductive rod 50 can be spaced 2mm apart along their length. During the winding process, the first electrode 10, the diaphragm 30, and the second electrode 20 are less likely to deform into the space between the first conductive rod 40 and the second conductive rod 50 after being compressed. Optionally, the first conductive rod 40 and the second conductive rod 50 can also be spaced 5mm apart along their length. This makes the diaphragm 30 between the first conductive rod 40 and the second conductive rod 50 less likely to break after being stretched. Optionally, the first conductive rod 40 and the second conductive rod 50 can also be spaced 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, etc., along their length.
[0066] The beneficial effects of this application embodiment are as follows: in the length direction of the first conductive rod 40, the distance between the first conductive rod 40 and the second conductive rod 50 is limited to the above-mentioned range, which can prevent the diaphragm 30 between the first conductive rod 40 and the second conductive rod 50 from being stretched and broken, and can also prevent the first electrode 10, the diaphragm 30 and the second electrode 20 from being squeezed and deformed into the space between the first conductive rod 40 and the second conductive rod 50 during the winding process.
[0067] In some embodiments, please refer to Figure 2 and Figure 3 The first conductive rod 40 extends to the outside of the first current collector 11 and forms the first electrode tab 41.
[0068] Along the length of the first conductive rod 40, the portion of the first conductive rod 40 extending beyond the first current collector 11 forms a first tab 41. When the first electrode 10 is a positive electrode, the first tab 41 is a positive tab. When the first electrode 10 is a negative electrode, the first tab 41 is a negative tab.
[0069] The beneficial effects of this application embodiment are as follows: the first tab 41 facilitates the electrical connection of the first current collector 11 to the external circuit of the battery core 100. The first tab 41 is part of the first conductive rod 40, eliminating the need to connect a separate tab to the first current collector 11, thus simplifying the manufacturing process of the battery core 100, and making the connection between the first tab 41 and the first current collector 11 more secure.
[0070] In some embodiments, please refer to Figure 2 and Figure 3 The second conductive rod 50 extends to the outside of the second current collector 21 and forms the second electrode tab 51.
[0071] Along the length of the second conductive rod 50, the portion of the second conductive rod 50 extending beyond the second current collector 21 forms a second tab 51. When the second electrode 20 is a positive electrode, the second tab 51 is a positive tab. When the second electrode 20 is a negative electrode, the second tab 51 is a negative tab.
[0072] The beneficial effects of this embodiment are as follows: the second tab 51 facilitates the electrical connection of the second current collector 21 to the external circuit of the battery core 100. The second tab 51 is part of the second conductive rod 50, eliminating the need to connect a separate tab to the second current collector 21, thus simplifying the manufacturing process of the battery core 100, and making the connection between the second tab 51 and the second current collector 21 more secure.
[0073] In some embodiments, please refer to Figure 2 and Figure 3 The first conductive rod 40 extends outside the first current collector 11 and forms a first electrode tab 41. The second conductive rod 50 extends outside the second current collector 21 and forms a second electrode tab 51.
[0074] In some embodiments, please refer to Figure 3 The lengths of the first conductive rod 40 and the second conductive rod 50 are equal. With the overall length of the first conductive rod 40 and the second conductive rod 50 being fixed, it can prevent the length of the first conductive rod 40 or the second conductive rod 50 from becoming too long, prevent the first conductive rod 40 or the second conductive rod 50 from being damaged by force, and ensure the strength of the first conductive rod 40 and the second conductive rod 50.
[0075] In some embodiments, please refer to Figure 2 The first electrode 10 includes two layers of first active material 12 located on both sides of the first current collector 11.
[0076] Two second electrode plates 20 and two diaphragms 30 are respectively provided. The two second electrode plates 20 are respectively connected to the side of the two diaphragms 30 away from the first active material layer 12, and the two second current collectors 21 of the two second electrode plates 20 are in contact with each other.
[0077] The two first active material layers 12 are located on both sides of the first current collector 11 along the thickness direction.
[0078] Two layers of first active material 12 are provided with a diaphragm 30 on the side opposite to the first current collector 11 along their own thickness direction, so as to separate the first electrode 10 and the second electrode 20.
[0079] The two second active material layers 22 of the two second electrodes 20 are respectively located on the surfaces of the two separators 30 that are opposite to the first active material layer 12. Optionally, the second electrode 20 can be a negative electrode, and the two second current collectors 21 can be copper foil.
[0080] Before the first electrode 10, diaphragm 30, and second electrode 20 are wound together, the two second current collectors 21 of the two second electrodes 20 are located at both ends of the integral body composed of the first electrode 10, diaphragm 30, and second electrode 20 along its own thickness direction. After the first electrode 10, diaphragm 30, and second electrode 20 are wound together, one of the second current collectors 21 is wound onto the other second current collector 21, and the two second current collectors 21 are in contact with each other.
[0081] The beneficial effects of this embodiment are as follows: Before winding the first electrode 10, the diaphragm 30, and the second electrode 20, two second current collectors 21 are disposed at both ends of the integrally formed by the first electrode 10, the diaphragm 30, and the second electrode 20 along its own thickness direction, which can protect the diaphragm 30 between the two second current collectors 21. When the first electrode 10, the diaphragm 30, and the second electrode 20 are hot-pressed and fixed, the two second current collectors 21 are not easily damaged.
[0082] In some embodiments, please refer to Figure 3 The two separators 30 are an integral structure, and the two separators 30 are connected at one end along their own length direction. In other words, the two separators 30 can be formed by folding the same film, which can reduce the steps of picking up and positioning the separators 30, thereby improving the efficiency of manufacturing the battery core 100.
[0083] In some embodiments, please refer to Figure 3 The two second current collectors 21 in the two second electrode plates 20 are an integral structure. The two second current collectors 21 are connected at one end along their own length direction. That is to say, the two second current collectors 21 can be formed by folding the same current collector, which can reduce the steps of picking up and positioning the second current collectors 21, thereby improving the efficiency of manufacturing the battery core 100.
[0084] In some embodiments, please refer to Figure 3 The two diaphragms 30 are an integral structure, and their ends are connected along their length. The two second current collectors 21 in the two second electrodes 20 are an integral structure, and their ends are connected along their length.
[0085] Optionally, the second conductive rod 50 and the second active material layer 22 are connected to the same side of the second current collector 21, and the second conductive rod 50 is connected to one end of the second current collector 21 connected to the other second current collector 21.
[0086] In some embodiments, the diaphragm 30 extends to both ends of the first current collector 11 along its length direction to prevent the first electrode 10 from short-circuiting with the second electrode 20.
[0087] In some embodiments, please refer to Figures 1 to 3The battery core 100 includes a first electrode 10, a second electrode 20, a separator 30, a first conductive rod 40, and a second conductive rod 50. The first electrode 10 includes a first current collector 11 and a first active material layer 12 disposed on the first current collector 11. The second electrode 20 has the opposite polarity to the first electrode 10; the second electrode 20 includes a second current collector 21 and a second active material layer 22 disposed on the second current collector 21. The separator 30 is disposed between the first electrode 10 and the second electrode 20.
[0088] The first conductive rod 40 extends along the width direction Y of the first electrode 10 and is electrically connected to the winding start end of the first current collector 11. The first conductive rod 40 and the first active material layer 12 are spaced apart on the surface of the first current collector 11.
[0089] The second conductive rod 50 extends along the width direction Y of the first electrode 10 and is electrically connected to the winding start end of the second current collector 21; the second conductive rod 50 and the second active material layer 22 are spaced apart on the surface of the second current collector 21.
[0090] The second conductive rod 50 and the first conductive rod 40 are spaced apart along the width direction Y of the first electrode 10. Along the length direction X of the first electrode 10, the second conductive rod 50 and the first conductive rod 40 are located at the same position. In the direction perpendicular to the first conductive rod 40, the maximum dimensions of the first conductive rod 40 and the second conductive rod 50 are 0.5mm and 1.5mm, respectively. The first electrode 10, the diaphragm 30, and the second electrode 20 are wound around the first conductive rod 40 and the second conductive rod 50.
[0091] An embodiment of the second aspect of this application also provides a battery, the battery including a housing and at least one battery core 100 of any one of the embodiments of the first aspect, the battery core 100 being located inside the housing.
[0092] All battery coils 100 are housed in a single housing. Optionally, only one battery coil 100 may be used. Alternatively, multiple battery coils 100 may be used, and these multiple battery coils 100 may be connected in series or in parallel.
[0093] The beneficial effects of this application embodiment are as follows: The battery of this application embodiment includes the battery core 100 of the first aspect embodiment. After the first electrode 10, separator 30 and second electrode 20 are wound together, a battery core 100 with a smaller diameter can be formed, possessing all the effects of the battery core 100 of the first aspect embodiment. The outer casing can also protect the battery core 100 and prevent external debris from affecting the charging and discharging of the battery core 100.
[0094] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A battery winding core, characterized in that, include: The first electrode includes a first current collector and a first active material layer disposed on the first current collector; The second electrode has the opposite polarity to the first electrode; the second electrode includes a second current collector and a second active material layer disposed on the second current collector; A diaphragm is disposed between the first electrode and the second electrode; The first conductive rod extends along the width direction of the first electrode and is electrically connected to the winding start end of the first current collector. The second conductive rod extends along the width direction of the first electrode and is electrically connected to the winding start end of the second current collector; the second conductive rod and the first conductive rod are spaced apart along the width direction of the first electrode. The first electrode, the diaphragm, and the second electrode are wound around the first conductive rod and the second conductive rod.
2. The battery core as described in claim 1, characterized in that, Along the length of the first electrode, the second conductive rod and the first conductive rod are located at the same position.
3. The battery core as described in claim 1, characterized in that, In the direction perpendicular to the first conductive rod, the maximum dimensions of the first conductive rod and the second conductive rod are 0.5mm-1.5mm, respectively.
4. The battery core as described in claim 1, characterized in that, The first conductive rod and the first active material layer are spaced apart on the surface of the first current collector; and / or, the second conductive rod and the second active material layer are spaced apart on the surface of the second current collector.
5. The battery core as described in claim 1, characterized in that, Along the length of the first conductive rod, the first conductive rod is spaced 2mm-5mm apart from the second conductive rod.
6. The battery core as described in claim 1, characterized in that, The first conductive rod extends outside the first current collector and forms a first tab; and / or, the second conductive rod extends outside the second current collector and forms a second tab.
7. The battery core as described in claim 1, characterized in that, The first conductive rod and the second conductive rod are of equal length.
8. The battery core as described in any one of claims 1-7, characterized in that, The first electrode includes two layers of the first active material located on both sides of the first current collector; Two second electrodes and two diaphragms are respectively provided. The two second electrodes are respectively connected to the side of the two diaphragms facing away from the first active material layer, and the two second current collectors of the two second electrodes are in contact with each other.
9. The battery core as described in claim 8, characterized in that, The two diaphragms are an integral structure, and one end of the two diaphragms is connected along their own length direction; and / or, the two second current collectors in the two second electrodes are an integral structure, and one end of the two second current collectors is connected along their own length direction.
10. A battery, characterized in that, It includes a housing and at least one battery core according to any one of claims 1-9, the battery core being located within the housing.