Positive plate and negative plate of cylindrical lithium battery
By designing tab connection areas on the positive and negative electrode plates, the tabs are concentrated at the end of the cell, solving the problem of dispersed tab distribution in the prior art and realizing convenient tab connection and efficient assembly of lithium batteries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YINGDE BAY DISTRICT NEW ENERGY TECH CO LTD
- Filing Date
- 2024-12-30
- Publication Date
- 2026-05-05
AI Technical Summary
After existing cylindrical lithium batteries are wound into cells, the positive and negative tabs may be distributed in a scattered manner, which makes it inconvenient to connect them with insulating pads. In particular, the tabs are distributed at two corners at the end of the cell, making it difficult to connect them effectively.
The design of the tab connection area for the positive and negative electrodes ensures that after being wound into a battery cell, the tabs are concentrated in a preset area on the upper or lower end face of the battery cell, facilitating the connection of the tabs through insulating pads.
This design enables centralized connection of the positive and negative tabs at the end of the cell, facilitating effective connection of the insulating pads and improving the assembly efficiency and safety of lithium batteries.
Smart Images
Figure CN224204101U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium battery technology, specifically to a cylindrical lithium battery positive electrode and negative electrode. Background Technology
[0002] Cylindrical lithium batteries are widely used in various fields such as solar lighting, lawn lighting, backup power, power tools, and toy models. They are safe to use and will not burn or explode due to improper operation such as overcharging, over-discharging, or short circuits. They are highly safe and environmentally friendly. A cylindrical lithium battery generally consists of a metal casing, a wound section, and a sealing body. The wound section is formed by rolling up a positive electrode sheet, a first separator paper, a negative electrode sheet, and a second separator paper. A negative electrode tab is led out from the negative electrode sheet and connected to the bottom of the steel casing, while a positive electrode tab is led out from the positive electrode sheet and connected to the positive terminal.
[0003] For example, Chinese patent document No. 20232061349.1, published on September 15, 2023, discloses a lithium battery negative electrode sheet, a lithium battery winding, and a cylindrical lithium battery. The lithium battery winding includes a layered assembly composed of an inner positive electrode sheet, a middle separator, and a negative electrode sheet, which are wound into a cylindrical shape. The negative electrode sheet includes a lithium foil of equal width and a metal foil of equal width. The metal foil and the lithium foil are stacked side by side to form a long strip. The metal foil is located at the end of the negative electrode sheet and forms the outermost ring of the cylindrical winding. A negative electrode tab is welded on the metal foil, and the end of the negative electrode tab away from the cylindrical winding extends outward. The outermost ring is set as a non-reactive metal foil, which avoids the waste of lithium metal, reduces raw material costs, improves the utilization rate of the negative electrode, and makes the lithium battery more economical and environmentally friendly.
[0004] The aforementioned literature describes a negative electrode body formed by connecting a metal foil to the end of a lithium foil and linking the metal foil with the lithium foil as the active material. The lithium foil portion fully participates in the reaction to form a structure with relatively consistent composition, thereby avoiding waste of lithium metal, reducing raw material costs, and improving the utilization rate of the negative electrode. However, it does not specify the position of the tabs connected to the electrode body. Since there are more than two tabs on the electrode body, after winding to form a cell, the tabs at the end of the cell may be in a dispersed state, such as two tabs being arranged at opposite corners. This makes it inconvenient to connect the tabs together through the insulating pad. Utility Model Content
[0005] The primary objective of this invention is to provide a cylindrical lithium battery positive electrode sheet. After the positive electrode sheet is wound to form a cylindrical wound cell, the positive electrode tabs located at the upper end of the cell are concentrated in a preset area, thereby facilitating the connection of the positive electrode tabs through the insulating pad.
[0006] The second objective of this invention is to provide a cylindrical lithium battery negative electrode sheet. After the negative electrode sheet is wound to form a cylindrical wound cell, the tabs located at the lower end of the cell are concentrated in a preset area, which facilitates the negative tabs to pass through the insulating pad and connect together.
[0007] To achieve the above objectives, this utility model provides a cylindrical lithium battery positive electrode sheet, including a positive electrode sheet body and two or more positive electrode tabs. The positive electrode sheet body is provided with a positive electrode tab connection area, the length of which is 4 to 6% of the length of the positive electrode sheet body. The positive electrode tab connection area is located at both ends of the positive electrode sheet body, and the distance from the positive electrode tab connection area to the end of the positive electrode sheet body is 6 to 12% of the length of the positive electrode sheet body. The positive electrode tabs are respectively connected to the positive electrode tab connection area.
[0008] Furthermore, the positive electrode connection area includes a positive electrode connection area one and a positive electrode connection area two, and the distance from the positive electrode connection area one to one end of the positive electrode body is 6 to 10% of the length of the positive electrode body.
[0009] Furthermore, the distance from the positive electrode tab connection area two to the other end of the positive electrode body is 8 to 12% of the length of the positive electrode body.
[0010] The above configuration allows the positive electrode body to be wound into a cylindrical cell when the positive electrode body is wound into a cylindrical cell. The position of the positive electrode tab connected in the positive electrode tab connection area one on the upper end of the cell can be used as the starting reference point. After the positive electrode body is wound into a cylindrical cell, the positive electrode tab connected in the positive electrode tab connection area two can be located on the same side as the positive electrode tab connected in the positive electrode tab connection area one. This makes the positive electrode tabs in the positive electrode tab connection area one and the positive electrode tabs in the positive electrode tab connection area two concentrated in the preset area at the upper end of the cell. This makes it easier for the positive electrode tabs to pass through the insulating pad and connect together when assembling the cylindrical lithium battery.
[0011] Furthermore, the width of the positive electrode connected in positive electrode connection region one is the same as the width of the positive electrode connected in positive electrode connection region two.
[0012] The above configuration allows the positive electrode tabs, concentrated in a pre-defined area at the top of the cell, to be better connected together after passing through the insulating pads, once the positive electrode body is wound into a cylindrical cell.
[0013] Another aspect of this utility model provides a cylindrical lithium battery negative electrode sheet, including a negative electrode sheet body and two or more negative electrode tabs. The negative electrode sheet body is provided with a negative electrode tab connection area. The length of the negative electrode tab connection area is 4 to 6% of the length of the negative electrode sheet body. The negative electrode tab connection area is located at both ends of the negative electrode sheet body. The distance from the negative electrode tab connection area to the end of the negative electrode sheet body is 10 to 17% of the length of the negative electrode sheet body. The negative electrode tabs are respectively connected to the negative electrode tab connection area.
[0014] Furthermore, the negative electrode tab connection area includes a negative electrode tab connection area one and a negative electrode tab connection area two, and the distance from the negative electrode tab connection area one to one end of the negative electrode body is 10 to 15% of the length of the negative electrode body.
[0015] Furthermore, the distance from the second negative electrode tab connection area to the other end of the negative electrode body is 12 to 17% of the length of the negative electrode body.
[0016] The above configuration allows the negative electrode sheet to be wound into a cylindrical cell when the negative electrode sheet is wound into a cylindrical cell. The position of the negative electrode tab connected in the negative electrode tab connection area one on the lower end face of the cell can be used as the starting reference point. After the negative electrode sheet is wound into a cylindrical cell, the negative electrode tab connected in the negative electrode tab connection area two can be located on the same side as the negative electrode tab connected in the negative electrode tab connection area one. This makes the negative electrode tabs in the negative electrode tab connection area one and the negative electrode tabs in the negative electrode tab connection area two concentrated in the preset area at the lower end of the cell. This makes it easier for the negative electrode tabs to pass through the insulating pad and connect together when assembling the cylindrical lithium battery.
[0017] Furthermore, the width of the negative electrode connected in negative electrode connection area one is the same as the width of the negative electrode connected in negative electrode connection area two.
[0018] The above configuration allows the negative electrode tabs, concentrated in a pre-defined area at the top of the cell, to be better connected after passing through the insulating pads, once the negative electrode body is wound into a cylindrical cell. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the positive electrode body structure in this utility model.
[0020] Figure 2 This is a schematic diagram of the negative electrode body structure in this utility model.
[0021] Figure 3 This is a schematic diagram of the stacked positive electrode body and negative electrode body in this utility model. Detailed Implementation
[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0023] Example 1.
[0024] like Figure 1As shown, a cylindrical lithium battery positive electrode includes a positive electrode body s1 and two or more positive tabs s2. In this embodiment, two positive tabs s2s are provided. The positive electrode body 1 is provided with positive tab connection areas, which are located at both ends of the positive electrode body s1. The length of the positive tab connection area is 4-6% of the length of the positive electrode body s1. In this embodiment, the length of the positive tab connection area is 5% of the length of the positive electrode body s1. The positive tab connection area includes a first positive tab connection area s31 and a second positive tab connection area s31. 32. The distance from one end of the positive electrode tab connection region s31 to the positive electrode body s1 is 6-10% of the length of the positive electrode body s1, and the distance from the other end of the positive electrode tab connection region s32 to the other end of the positive electrode body s1 is 8-12% of the length of the positive electrode body s1. In this embodiment, the distance from one end of the positive electrode tab connection region s31 to the other end of the positive electrode body s1 is 7% of the length of the positive electrode body s1, and the distance from the other end of the positive electrode tab connection region s32 to the other end of the positive electrode body s1 is 9% of the length of the positive electrode body s1. The two positive electrodes s2 are divided into... The positive tab s2 connected to positive tab connection area one (s31) and positive tab connection area two (s32) is connected separately. The width of the positive tab s2 connected to positive tab connection area one (s31) is the same as the width of the positive tab s2 connected to positive tab connection area two (s32). This structure allows the positive tab s2 connected to positive tab connection area one (s31) to be used as the starting reference point when the positive electrode body (s1) is wound into a cylindrical battery cell. After the positive electrode body (s1) is wound into a cylindrical battery cell, the positive tab s2 connected to positive tab connection area two (s32) can be connected to positive tab connection area two (s32). In section 2, the positive tab s2 is located on the same side as the positive tab s2 connected in positive tab connection area one s31, so that the positive tab s2 in positive tab connection area one s31 and the positive tab s2 in positive tab connection area two s32 are concentrated in the preset area at the upper end of the cell. Since the cross-sectional shape of the upper end of the cell is circular, the preset area is a fan-shaped area of 0~30° within the cross-section and centered on the center of the cross-section. This makes it easy for the positive tabs to pass through the insulating pad and connect together when assembling the cylindrical lithium battery.
[0025] Example 2.
[0026] like Figure 2As shown, a cylindrical lithium battery negative electrode sheet includes a negative electrode sheet body s4 and two or more negative electrode tabs s5. In this embodiment, there are two negative electrode tabs s5. The negative electrode sheet body s4 has a negative electrode tab connection area, the length of which is 4-6% of the length of the negative electrode sheet body s4. In this embodiment, the length of which is 5% of the length of the negative electrode sheet body s4. The negative electrode tab connection area is located at both ends of the negative electrode sheet body s4. The negative electrode tab connection area includes a first negative electrode tab connection area s61 and a second negative electrode tab connection area s62. The first negative electrode connection region s61 and the second negative electrode connection region s62 are located at both ends of the negative electrode body s4. The distance from the first negative electrode connection region s61 to one end of the negative electrode body s4 is 10-15% of the length of the negative electrode body s4, and the distance from the second negative electrode connection region s62 to the other end of the negative electrode body s4 is 12-17% of the length of the negative electrode body s4. In this embodiment, the distance from the first negative electrode connection region s61 to one end of the negative electrode body s4 is 12% of the length of the negative electrode body s4, and the distance from the second negative electrode connection region s62 to the other end of the negative electrode body s4 is 12% of the length of the negative electrode body s4. The negative electrode sheet s4 is 14% of the length of the main body. Two negative electrode tabs s5 are connected to negative electrode tab connection area one s61 and negative electrode tab connection area two s62, respectively. The width of the negative electrode tab s5 connected in negative electrode tab connection area one s61 is the same as the width of the negative electrode tab s5 connected in negative electrode tab connection area two s62. This structure allows the negative electrode sheet s4 to be wound into a cylindrical battery cell, with the position of the negative electrode tab s5 connected in negative electrode tab connection area one s61 at the lower end face of the battery cell as the starting reference point. After the negative electrode sheet s4 is wound into a cylindrical battery cell, the connection... The negative tab s5 in negative tab connection area 2 s62 is located on the same side as the negative tab s5 in negative tab connection area 1 s61, so that the negative tab s5 in negative tab connection area 1 s61 and the negative tab s5 in negative tab connection area 2 s62 are concentrated in the preset area at the lower end of the cell. Since the cross-sectional shape of the lower end of the cell is circular, the preset area is a fan-shaped area of 0~30° within the cross-section and centered on the center of the cross-section. This makes it easy for the negative tabs to pass through the insulating pad and connect together when assembling cylindrical lithium batteries.
[0027] like Figure 3As shown, in this embodiment, since the distance from the positive electrode connection area to the end of the positive electrode body s1 is different from the distance from the negative electrode connection area to the end of the negative electrode body s4, the distance from the positive electrode s2 to the end of the positive electrode body s1 is different from the distance from the negative electrode s5 to the end of the negative electrode body s4. An insulating layer s7 is provided between the stacked layers of the positive electrode body s1 and the negative electrode body s4. In this way, when the stacked layers of the positive electrode body s1 and the negative electrode body s4 are wound into a cylindrical battery cell, the positive electrode s2 located in the preset area at the upper end of the battery cell and the negative electrode s5 located in the preset area at the lower end of the battery cell can be misaligned. This makes it easier to distinguish the positive electrode and the negative electrode during the assembly process and avoids incorrect assembly.
Claims
1. A cylindrical lithium battery positive electrode sheet, characterized in that: It includes a positive electrode body and two or more positive electrode tabs. The positive electrode body has a positive electrode tab connection area. The length of the positive electrode tab connection area is 4 to 6% of the length of the positive electrode body. The positive electrode tab connection area is located at both ends of the positive electrode body. The distance from the positive electrode tab connection area to the end of the positive electrode body is 6 to 12% of the length of the positive electrode body. The positive electrodes are respectively connected to the positive electrode tab connection area. The positive electrode tab connection area includes positive electrode tab connection area one and positive electrode tab connection area two. The distance from positive electrode tab connection area one to one end of the positive electrode body is 6 to 10% of the length of the positive electrode body.
2. The cylindrical lithium battery positive electrode sheet according to claim 1, characterized in that: The distance from the second positive electrode tab connection area to the other end of the positive electrode body is 8 to 12% of the length of the positive electrode body.
3. The cylindrical lithium battery positive electrode sheet according to claim 1, characterized in that: The width of the positive electrode connected in positive electrode connection region one is the same as the width of the positive electrode connected in positive electrode connection region two.
4. A cylindrical lithium battery negative electrode sheet, characterized in that: It includes a negative electrode body and two or more negative electrode tabs. The negative electrode body has a negative electrode tab connection area. The length of the negative electrode tab connection area is 4 to 6% of the length of the negative electrode body. The negative electrode tab connection area is located at both ends of the negative electrode body. The distance from the negative electrode tab connection area to the end of the negative electrode body is 10 to 17% of the length of the negative electrode body. The negative electrode tabs are respectively connected to the negative electrode tab connection area. The negative electrode tab connection area includes negative electrode tab connection area one and negative electrode tab connection area two. The distance from negative electrode tab connection area one to one end of the negative electrode body is 10 to 15% of the length of the negative electrode body.
5. A cylindrical lithium battery negative electrode sheet according to claim 4, characterized in that: The distance from the second negative electrode tab connection area to the other end of the negative electrode body is 12-17% of the length of the negative electrode body.
6. A cylindrical lithium battery negative electrode sheet according to claim 4, characterized in that: The width of the negative electrode connected in negative electrode connection area one is the same as the width of the negative electrode connected in negative electrode connection area two.