Pole group, battery monomer, battery module and battery box
By designing the tabs as sheet-like triangular structures and bending them along the axis of the electrode assembly body, the problem of low yield of battery cells caused by overlapping tabs was solved, and high yield of battery cells, modules and boxes was achieved.
Patent Information
- Application Number
- CN202423266160.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-12-30
AI Technical Summary
The tabs of existing cylindrical electrode groups are sheet-like rectangular or trapezoidal structures, resulting in a lot of overlap between the tabs, making them difficult to flatten and preventing electrolyte from penetrating, thus reducing the yield of individual battery cells.
The electrode tabs are designed as sheet-like triangular structures, with one side of the tab connected to the electrode assembly body. Multiple tabs are arranged sequentially along the winding direction of the electrode assembly body and bent toward the axis. Laser cutting technology is used to improve the dimensional accuracy and production efficiency of the tabs, reduce the overlap of the tabs, and ensure electrolyte penetration.
It improves the connection reliability between the electrode assembly and the electrode assembly body, reduces the probability of uneven electrode tabs, enhances the permeability of electrolyte in the battery cell, and improves the yield of battery cells, modules and boxes.
Smart Images
Figure CN223843140U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to an electrode assembly, a battery cell, a battery module, and a battery box. Background Technology
[0002] Currently, cylindrical electrode groups are divided into full-tab electrode groups and multi-tab electrode groups. A full-tab electrode group refers to an electrode group with multiple tabs extending from its end, and these tabs are stacked sequentially to form a relatively thick electrode group. A multi-tab electrode group refers to an electrode group with multiple tabs extending from its end, and these tabs are staggered.
[0003] The tabs on multi-tab electrode assemblies are mostly rectangular or trapezoidal sheet structures. When multiple staggered tabs are flattened, the overlapping parts between the tabs due to their rectangular or trapezoidal sheet structure cause unevenness. Furthermore, the overlapping parts prevent the electrolyte from penetrating the tabs and wetting the interior of the electrode assembly, reducing the yield of individual battery cells.
[0004] Therefore, there is an urgent need to propose a new type of electrode assembly, battery cell, battery module, and battery box to solve the above-mentioned technical problems. Utility Model Content
[0005] The first objective of this invention is to provide an electrode assembly that improves the yield rate of individual battery cells.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] The pole group includes:
[0008] The polar group body is rolled up;
[0009] The electrode tab is a sheet-like triangular structure. One side of the electrode tab is connected to one end of the electrode assembly body. There are multiple electrode tabs, which are arranged sequentially along the winding direction of the electrode assembly body, and all of the electrode tabs are bent towards the axial direction of the electrode assembly body.
[0010] Optionally, the electrode tab is a sheet-like isosceles triangular structure, and the base of the electrode tab is connected to one end of the electrode assembly body.
[0011] Optionally, the angle of the apex of the electrode ear on the side opposite to the electrode assembly body is 25°-50°.
[0012] Optionally, multiple tabs are connected sequentially along the winding direction of the pole assembly body.
[0013] Optionally, the electrode ear near the center of the electrode assembly body is called the central electrode ear, and the electrode ear near the outer periphery of the electrode assembly body is called the peripheral electrode ear. The apex angle of the central electrode ear on the side away from the electrode assembly body is smaller than the apex angle of the peripheral electrode ear on the side away from the electrode assembly body.
[0014] Optionally, from the center of the pole assembly body along the winding direction of the pole assembly body to the outer periphery of the pole assembly body, the apex angle of the pole tab on the side away from the pole assembly body gradually increases.
[0015] The second objective of this invention is to provide a battery cell with a high yield rate.
[0016] To achieve this objective, the present invention adopts the following technical solution:
[0017] A battery cell includes a battery casing and the aforementioned electrode assembly, with the terminals disposed within the battery casing.
[0018] The third objective of this invention is to provide a battery module with a high yield rate.
[0019] To achieve this objective, the present invention adopts the following technical solution:
[0020] The battery module includes at least two of the aforementioned battery cells, and the at least two battery cells are electrically connected.
[0021] The fourth objective of this invention is to provide a battery box with a high yield rate.
[0022] To achieve this objective, the present invention adopts the following technical solution:
[0023] The battery box includes a box body and the aforementioned battery modules, with the battery modules housed within the box body.
[0024] The beneficial effects of this utility model are:
[0025] The electrode assembly provided by this utility model has a tab in the form of a sheet-like triangular structure. One side of the tab is connected to one end of the electrode assembly body to ensure a high connection reliability between the tab and the electrode assembly body. Multiple tabs are arranged sequentially along the winding direction of the electrode assembly body. When multiple tabs are flattened so that they are all bent towards the axis of the electrode assembly body, the overlap between adjacent tabs is small due to the sheet-like triangular structure of the tabs, which reduces the probability of the tabs not being flattened. Furthermore, because the overlap between adjacent tabs is small, the electrolyte in the battery case can permeate through the tabs and wet the electrode assembly body, which has the effect of improving the yield of individual battery cells. Attached Figure Description
[0026] Figure 1 This is a top view of the pole assembly provided in Embodiment 1 of this utility model;
[0027] Figure 2 This is a schematic diagram of the structure of the pole body before winding, as provided in Embodiment 1 of this utility model.
[0028] In the picture:
[0029] 100, electrode; 200, electrode sheet. Detailed Implementation
[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0033] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0034] Example 1
[0035] This embodiment provides an electrode assembly that improves the yield rate of individual battery cells.
[0036] Specifically, such as Figure 1As shown, the electrode assembly includes an electrode assembly body (not shown in the figure) and electrode tabs 100. The electrode assembly body is rolled up, and the electrode tabs 100 are sheet-like triangular structures. One side of the electrode tabs 100 is connected to one end of the electrode assembly body. There are multiple electrode tabs 100, which are arranged sequentially along the winding direction of the electrode assembly body, and all of the electrode tabs 100 are bent toward the axial direction of the electrode assembly body.
[0037] Based on the above design, the tab 100 has a sheet-like triangular structure. One side of the tab 100 is connected to one end of the electrode assembly body to ensure high connection reliability between the tab 100 and the electrode assembly body. Multiple tabs 100 are arranged sequentially along the winding direction of the electrode assembly body. When multiple tabs 100 are flattened so that they are all bent towards the axis of the electrode assembly body, the overlap between adjacent tabs 100 is small due to the sheet-like triangular structure of the tab 100, which reduces the probability of the tabs 100 not being flattened. Furthermore, because the overlap between adjacent tabs 100 is small, the electrolyte inside the battery case can permeate through the tabs 100 and wet the electrode assembly body, which has the effect of improving the yield of individual battery cells.
[0038] like Figure 2 As shown, before the electrode assembly body is wound into a roll, the electrode assembly body is a sheet-like rectangular structure (hereinafter referred to as electrode sheet 200). Multiple triangular tabs 100 are located on one side of the electrode sheet 200. The electrode sheet 200 is wound around an axis parallel to its width direction to obtain the rolled electrode assembly body. The above-described process of winding the electrode sheet 200 into a rolled electrode assembly body is a common process in the art and will not be elaborated upon here.
[0039] In this embodiment, the sheet-like triangular structure is made by laser cutting. Laser cutting is a common process in the field, with advantages such as high cutting precision and high efficiency. Therefore, using laser cutting to prepare the triangular tab 100 is beneficial to improving the dimensional accuracy of the tab 100 and improving production efficiency.
[0040] Optionally, such as Figure 1 As shown, multiple tabs 100 are connected sequentially along the winding direction of the pole group body, so that current can flow directly from one tab 100 to another tab 100 adjacent to it. It can be seen that this structural design can reduce the impedance of the pole group and improve the conductivity of the unit.
[0041] Optionally, such as Figure 1As shown, the tab 100 is a sheet-like isosceles triangular structure, and the base of the tab 100 is connected to one end of the electrode assembly body. This structural design is beneficial to the high flatness of multiple tabs 100 after being flattened and bent. In particular, the tabs 100 close to the outer periphery of the electrode assembly body are flattened by the outer tabs along the winding direction of the electrode assembly body. The outer tabs press against the inner tabs 100 on the side away from the electrode assembly body. Therefore, the tabs 100 close to the outer periphery of the electrode assembly body are not easy to flatten. In this embodiment, the tab 100 is set as a sheet-like isosceles triangular structure, which provides a guarantee for improving the flatness of the tabs 100 close to the outer periphery of the electrode assembly body.
[0042] Furthermore, the angle of the apex of the tab 100 away from the electrode assembly body is 25°-50°. For example, the angle of the apex of the tab 100 away from the electrode assembly body can be 25°, 30°, 45° or 50°, etc. If the apex angle is less than 25°, when the electrode 200 is wound into a rolled electrode assembly body, the apex of the tab 100 away from the electrode assembly body is easily folded and damaged. If the apex angle is greater than 50°, the overlapping area of the tabs 100 near the center of the electrode assembly body increases, causing the tabs 100 near the center of the electrode assembly body to bulge upward. In addition, setting the apex angle within 50° allows for a gap between two adjacent tabs 100 (especially the tabs 100 located in the outer peripheral area of the electrode assembly body), which is beneficial for the electrolyte to penetrate into the electrode assembly body through the gap. As can be seen, in this embodiment, the apex angle is designed to be 25°-50°, which can not only reduce the probability of the tab 100 being damaged by bending when the electrode sheet 200 is wound, but also improve the flatness of the tab 100 bending towards the axis of the electrode assembly body, and also facilitate the immersion of electrolyte into the electrode assembly body.
[0043] Optionally, compared to the outer peripheral region of the electrode assembly body, the tabs 100 located in the central region of the electrode assembly body are more densely packed. Therefore, in this embodiment, from the center of the electrode assembly body along the winding direction of the electrode assembly body to the outer periphery of the electrode assembly body, the apex angle of the tabs 100 on the side away from the electrode assembly body gradually increases, so as to disperse the tabs 100 located in the central region of the electrode assembly body as much as possible, thereby improving the flatness of the tabs 100 located in the central region of the electrode assembly body.
[0044] This embodiment also provides a battery cell, which includes a battery casing and the aforementioned electrode assembly. The electrode posts are disposed inside the battery casing. The multiple tabs 100 of the aforementioned electrode assembly are all sheet-like triangular structures, which makes the flatness of the multiple tabs 100 bent towards the axis of the electrode assembly body relatively high. It also facilitates the electrolyte to penetrate through the tabs 100 and wet the electrode assembly body, thus improving the yield of the electrode assembly. Therefore, the battery cell using the aforementioned electrode assembly has a high yield.
[0045] This embodiment also provides a battery module, which includes at least two of the above-mentioned battery cells, and the at least two battery cells are electrically connected. The battery cells have a high yield rate, which is beneficial to improving the yield rate of the battery module.
[0046] This embodiment also provides a battery box, which includes a box body and the aforementioned battery module. The battery module is disposed inside the box body, and the battery box has a high yield rate.
[0047] Example 2
[0048] This embodiment provides a pole group, which differs from the pole group provided in Embodiment 1 in that:
[0049] The electrode tab 100 near the center of the electrode assembly body is the central electrode tab, and the electrode tab 100 near the outer periphery of the electrode assembly body is the peripheral electrode tab. The apex angle of the central electrode tab on the side away from the electrode assembly body is smaller than the apex angle of the peripheral electrode tab on the side away from the electrode assembly body, so as to disperse the electrode tabs 100 located in the central region of the electrode assembly body as much as possible, thereby improving the flatness of the electrode tabs 100 located in the central region of the electrode assembly body.
[0050] The remaining structure of the electrode assembly provided in this embodiment is the same as that in Embodiment 1, and will not be described again.
[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. An electrode assembly, characterized in that, include: The electrode assembly body is in a rolled shape; The electrode tab (100) is a sheet-like triangular structure. One side of the electrode tab (100) is connected to one end of the electrode assembly body. There are multiple electrode tabs (100), which are arranged sequentially along the winding direction of the electrode assembly body, and all of the electrode tabs (100) are bent toward the axial direction of the electrode assembly body.
2. The electrode assembly according to claim 1, characterized in that, The tab (100) is a sheet-like isosceles triangular structure, and the base of the tab (100) is connected to one end of the electrode assembly body.
3. The electrode assembly according to claim 1, characterized in that, The angle of the apex of the tab (100) facing away from the pole body is 25°-50°.
4. The electrode assembly according to claim 1, characterized in that, Multiple electrodes (100) are connected sequentially along the winding direction of the electrode assembly body.
5. The electrode assembly according to claim 1, characterized in that, The electrode tab (100) near the center of the electrode assembly body is the central electrode tab, and the electrode tab (100) near the outer periphery of the electrode assembly body is the peripheral electrode tab. The apex angle of the central electrode tab on the side away from the electrode assembly body is smaller than the apex angle of the peripheral electrode tab on the side away from the electrode assembly body.
6. The electrode assembly according to claim 1, characterized in that, From the center of the electrode assembly body along the winding direction of the electrode assembly body to the outer periphery of the electrode assembly body, the apex angle of the electrode tab (100) on the side away from the electrode assembly body gradually increases.
7. A single battery cell, characterized in that, It includes a battery casing and an electrode assembly as described in any one of claims 1-6, wherein the electrode assembly is disposed within the battery casing.
8. A battery module, characterized in that, It includes at least two battery cells as described in claim 7, and the at least two battery cells are electrically connected.
9. A battery box, characterized in that, It includes a housing and the battery module as described in claim 8, wherein the battery module is disposed within the housing.