Single cell and battery pack
Patent Information
- Application Number
- CN202521961837.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-11
- Publication Date
- 2026-08-18
- Estimated Expiration
- 2035-09-11
AI Technical Summary
[0003]但是，裁切极耳组会产生金属碎屑，碎屑可能掉落到电芯中影响电芯安全性
[0007] In this application, the length of each tab is positively correlated with the distance between their relative convergence points, thereby aligning the tabs as much as possible and preventing some tabs from being too long and directly connected to the fusion section or the tab welding area. Furthermore, the solution in this application eliminates the need for tab cutting, preventing the generation of debris. In addition, the ratio of the distance L1 between the fusion section and the electrode welding area and the distance L2 between the fusion section and the tab welding area should be appropriate, i.e., a suitable L1/L2. If L1/L2 is too small, the fusion section will be too close to the electrode welding area, and the fusion section will be greatly affected by heat; conversely, if L1/L2 is too large, the fusion section will be too close to the tab welding area, and it will also be greatly affected by heat.
Smart Images
Figure CN224652660U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of battery cell structure, and specifically proposes a single battery cell and a battery pack. Background Technology
[0002] In a battery cell, multiple tabs are drawn out from the electrode sheet and brought together to form a tab assembly. The tab assembly is then electrically connected to the terminal post via an adapter plate. Because the bringing-to-gathering paths of each tab are different, the ends of the tabs after gathering will be uneven. The commonly used method is to cut the tab assembly to form aligned edges.
[0003] However, cutting the tab assembly will generate metal shavings, which may fall into the battery cell and affect the cell's safety. Utility Model Content
[0004] The purpose of this application is to solve at least some of the technical problems mentioned above, and this purpose is achieved through the following technical solutions:
[0005] This application proposes a single-cell battery, comprising terminals, a cell, and an adapter plate. The cell has multiple tabs leading out, which are brought together to form a tab assembly, and the length of each tab is positively correlated with the distance between their relative positions. The adapter plate has a tab welding area, a terminal welding area, and a fusible link. The tab welding area is welded to the tab assembly, the terminal welding area is welded to the terminal, and the fusible link is located between the tab welding area and the terminal welding area. The distance between the fusible link and the terminal welding area is L1, and the distance between the fusible link and the tab welding area is L2, satisfying 0.33 ≤ L1 / L2 ≤ 4.5.
[0006] The technical solution proposed in this application has at least the following technical effects:
[0007] In this application, the length of each tab is positively correlated with the distance between their relative convergence points, thereby aligning the tabs as much as possible and preventing some tabs from being too long and directly connected to the fusion section or the tab welding area. Furthermore, the solution in this application eliminates the need for tab cutting, preventing the generation of debris. In addition, the ratio of the distance L1 between the fusion section and the electrode welding area and the distance L2 between the fusion section and the tab welding area should be appropriate, i.e., a suitable L1 / L2. If L1 / L2 is too small, the fusion section will be too close to the electrode welding area, and the fusion section will be greatly affected by heat; conversely, if L1 / L2 is too large, the fusion section will be too close to the tab welding area, and it will also be greatly affected by heat. Attached Figure Description
[0008] To better integrate the content illustrated in the accompanying drawings with the description of the specific embodiments, a brief introduction to the drawings is provided below. It is understood that the accompanying drawings mentioned below are merely schematic illustrations of some embodiments of the relevant technical solutions and the technical solutions of this application. Without creative effort, those skilled in the art can create drawings illustrating other embodiments.
[0009] Specifically, the annotations for the accompanying drawings are as follows:
[0010] Figure 1 This is a partial structural schematic diagram of a single battery cell described in some embodiments of this application;
[0011] Figure 2 This is a first isometric view of a single cell described in some embodiments of this application;
[0012] Figure 3 This is a second isometric view of a single cell described in some embodiments of this application.
[0013] Specifically, the annotations for the figure marks in the instruction manual are as follows:
[0014] 10. Battery cell; 101. Electrode assembly; 1011. First electrode; 20. Adapter piece; 201. Fusible link; 202. Electrode welding area; 203. Terminal welding area; 30. Terminal. Detailed Implementation
[0015] To make the embodiments of this application clearer, they will be described below in conjunction with the accompanying drawings. It should be understood that the content mentioned below represents only some embodiments of this application, and not all embodiments are listed exhaustively. Therefore, other embodiments that can be obtained based on the following embodiments without any inventive effort fall within the protection scope of this application.
[0016] It should be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to impose strict limitations on the technical solutions unless the context clearly indicates otherwise. For example, the use of "a," "an," and "the" to modify a feature does not preclude the possibility that the feature may be plural in other embodiments.
[0017] It should be understood that the terms "comprising," "including," and "having" are open-ended, indicating the presence of the stated features but not excluding the possibility of other features in the embodiment. Similarly, the use of terms such as "first," "second," etc., to describe multiple features only indicates the distinction between one feature and another, and such terms do not imply order or sequence unless explicitly stated in the context.
[0018] It should be understood that, unless the context clearly indicates otherwise, the terms "setup," "connection," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a direct connection or an indirect connection via a medium. Those skilled in the art will understand the specific meaning of these terms in this document based on the specific circumstances.
[0019] In addition, for ease of description, the text will use terms of spatial relative relationship to describe the position of one feature relative to another feature, such as "inner", "outer", "end", "side", "upper", "middle", "lower", "high", "low", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations besides those shown in the accompanying drawings of the specification.
[0020] The embodiments of this application are described below with reference to the accompanying drawings. It can be understood that the technical features involved in the different embodiments described below can be combined with each other as long as they do not conflict with each other.
[0021] Firstly, referring to Figures 1 to 3 This application proposes a single-cell battery comprising a terminal post 30, a cell 10, and an adapter plate 20. The cell 10 has multiple tabs leading out, which converge to form a tab assembly 101, and the length of each tab is positively correlated with the distance between their relative convergence positions. The adapter plate 20 has a tab welding area 202, a terminal post welding area 203, and a fusible portion 201. The tab welding area 202 is welded to the tab assembly 101, the terminal post welding area 203 is welded to the terminal post 30, and the fusible portion 201 is located between the tab welding area 202 and the terminal post welding area 203. The distance between the fusible portion 201 and the terminal post welding area 203 is L1, and the distance between the fusible portion 201 and the tab welding area 202 is L2, satisfying 0.33 ≤ L1 / L2 ≤ 4.5.
[0022] In this embodiment, the length of each tab is positively correlated with the distance between their relative convergence positions, thereby aligning the tabs as much as possible and preventing some tabs from being too long and directly connected to the fusion section 201 or the tab welding area 202. Furthermore, it eliminates the need for tab cutting, preventing the generation of debris. In addition, the ratio of the distance L1 between the fusion section 201 and the electrode welding area 203, and the distance L2 between the fusion section 201 and the tab welding area 202, should be appropriate, i.e., a suitable L1 / L2 ratio. If L1 / L2 is too small, the fusion section 201 will be too close to the electrode welding area 203, and the fusion section 201 will be greatly affected by heat; conversely, if L1 / L2 is too large, the fusion section 201 will be too close to the tab welding area 202, and it will also be greatly affected by heat. For example, L1 / L2 can take any one of the following values: 0.33, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, and 4.5, or be within the range of any two of these values.
[0023] It should be noted that when the current inside the battery is too high, the fuse 201 will melt and disconnect the circuit in order to avoid thermal runaway.
[0024] In some embodiments, the distance L1 between the fused portion 201 and the electrode welding area 203 satisfies 2mm≤L1≤18mm.
[0025] In this embodiment, based on the above analysis, L1 should also be appropriate. For example, L1 can be any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm and 18mm or within the range of any two of these values.
[0026] In some embodiments, the distance L1 between the fused portion 201 and the electrode welding area 203 satisfies 1mm≤L2≤15mm.
[0027] In this embodiment, L2 should also be appropriate. For example, L2 can be any one of 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm and 15mm or within the range of any two of these values.
[0028] In some embodiments, the fusible portion 201 is a thinning structure, a widening structure, and / or a perforated structure.
[0029] In this embodiment, refer to Figure 2 The fuse section 201 has a perforated structure; refer to Figure 3 The fuse section 201 is a widened structure. Of course, the fuse section 201 can also be a thinned structure. All of the above are preferred implementation methods and can achieve the effect of fuse breaking when the overcurrent is large.
[0030] In some embodiments, refer to Figure 2 The tab assembly 101 is welded to the side of the adapter piece 20 facing the cell 10.
[0031] In this embodiment, the pole post 30 is generally welded to the side of the adapter plate 20 facing away from the battery cell 10, while the tab assembly 101 is welded to the side of the adapter plate 20 facing the battery cell 10. Therefore, it can effectively prevent some tabs in the tab assembly 101 from being too long and directly connected to the pole post 30.
[0032] In some embodiments, refer to Figure 3 The tab assembly 101 is welded to the side of the adapter piece 20 facing away from the battery cell 10.
[0033] In this embodiment, part of the thickness of the tab assembly 101 coincides with the thickness of the electrode post 30 in the height direction of the cell 10, resulting in high space utilization and increased volumetric energy density.
[0034] In some embodiments, multiple electrodes in the electrode assembly 101 are welded together to form a pre-welded area.
[0035] In this embodiment, the overall structural strength of the tab assembly 101 can be enhanced, preventing delamination and other issues from occurring.
[0036] In some embodiments, the pre-welded area at least partially overlaps with the tab welding area 202.
[0037] In this embodiment, the connection between the tab assembly 101 and the adapter piece 20 is improved, making the welding of the adapter piece 20 and the tab assembly 101 more convenient.
[0038] In some embodiments, the length of each tab increases in a gradient as the distance between its lead-out position and its convergence position increases.
[0039] In this embodiment, the size difference between each pair of adjacent tabs is equal, that is, the size of the tabs increases in a gradient, which facilitates manufacturing, reduces costs, and makes it easier to control the alignment of the ends of the tab assembly 101.
[0040] In some embodiments, the length of the tabs has a first gradient and a second gradient. The length of the tabs closer to the convergence position is the first gradient, and the length of the tabs farther from the convergence position is the second gradient. The second gradient is longer than the first gradient.
[0041] In this embodiment, with Figure 1Taking the structure shown as an example, the tab group 101 includes a horizontally extended first tab 1011. It can be understood that the distance between the extension position of the first tab 1011 (relative to the extension positions of other tabs) and the convergence position of the tab group 101 is the smallest. The length between two adjacent tabs among the multiple tabs above the first tab 1011 can be increased according to the first gradient. The length between two adjacent tabs among the multiple tabs below the first tab 1011 can be increased according to the second gradient. This setting is more in line with the tab length requirements when the tab group 101 is actually converged, and it is also convenient for the standardization and production of tab length.
[0042] In some embodiments, the length difference between the second gradient and the first gradient is greater than or equal to 2 mm and less than or equal to 10 mm.
[0043] In this embodiment, the length difference between the second gradient and the first gradient should not be too large; otherwise, some tabs will have excessive redundancy, resulting in uneven ends of the tab assembly 101, and some excessively long tabs may be directly connected to the pole post 30. Conversely, the length difference between the second gradient and the first gradient should not be too small; otherwise, some tabs may be insufficient in length, also causing uneven ends of the tab assembly 101. Therefore, the length difference between the second gradient and the first gradient should be moderate, for example, it can be any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm, or fall within the range of any two of these values.
[0044] Secondly, embodiments of this application propose a battery pack comprising the single cell of the first aspect. Therefore, the battery pack of the second aspect possesses all the technical effects of the single cell of the first aspect, the technical effects of which will not be elaborated further.
[0045] It should be noted that the battery pack in this embodiment only presents the structure related to the improvement points. Of course, it may also include other components. For example, the battery pack may also include a housing for accommodating multiple individual cells and an insulating pad for isolating the individual cells, etc. Other components will not be described here.
[0046] In particular, the term "and / or" in this application should be understood as follows:
[0047] In the first case, the term “and / or” between the first subject and the second subject includes any of the following meanings: (1) only the first subject; (2) only the second subject; and (3) both the first subject and the second subject.
[0048] In the second case, the term "and / or" between the last two of three or more subjects means including at least any one of the subjects. For example, "first subject, second subject and / or third subject" has the same meaning as "first subject and / or second subject and / or third subject", specifically including the following combinations: (1) only the first subject; (2) only the second subject; (3) only the third subject; (4) first subject and second subject and no third subject; (5) first subject and third subject and no second subject; (6) second subject and third subject and no first subject; and (7) first subject, second subject and third subject;
[0049] Furthermore, the character " / " in this application indicates that the objects before and after it are in an "or" relationship.
[0050] Finally, although the embodiments of this application have been described above in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the concept of this application, and such modifications and variations all fall within the scope of protection of this application.
Claims
1. A single-cell battery, characterized in that, include: pole (30); The battery cell (10) has multiple tabs leading out, and the multiple tabs are brought together to form a tab group (101), and the length of each tab is positively correlated with the distance between its relative gathering position; The adapter piece (20) is provided with a tab welding area (202), a pole welding area (203) and a fusion section (201). The tab welding area (202) is welded to the tab assembly (101), the pole welding area (203) is welded to the pole (30), and the fusion section (201) is located between the tab welding area (202) and the pole welding area (203). The distance between the fusion section (201) and the pole welding area (203) is L1, and the distance between the fusion section (201) and the tab welding area (202) is L2, and satisfies 0.33≤L1 / L2≤4.
5.
2. The single-cell battery according to claim 1, characterized in that, The distance L1 between the fused section (201) and the pole welding area (203) satisfies 2mm≤L1≤18mm.
3. The single-cell battery according to claim 1, characterized in that, The distance L2 between the fused portion (201) and the electrode welding area (202) satisfies 1mm≤L2≤15mm.
4. The single-cell battery according to claim 1, characterized in that, The fused portion (201) is a thinning structure, a widening structure, and / or a perforated structure.
5. The single-cell battery according to claim 1, characterized in that, The tab assembly (101) is welded to the side of the adapter plate (20) facing the battery cell (10).
6. The single-cell battery according to claim 1, characterized in that, The tab assembly (101) is welded to the side of the adapter plate (20) facing away from the battery cell (10).
7. The single-cell battery according to claim 1, characterized in that, The multiple electrodes in the electrode assembly (101) are welded together to form a pre-welded area.
8. The single-cell battery according to claim 7, characterized in that, The pre-welded area at least partially overlaps with the tab welding area (202).
9. The single-cell battery according to any one of claims 1 to 8, characterized in that, The length of each tab increases in a gradient as the distance between its lead-out position and its convergence position increases.
10. The single-cell battery according to claim 9, characterized in that, The length of the electrode has a first gradient and a second gradient. The length of the electrode closer to the convergence position is the first gradient, and the length of the electrode farther from the convergence position is the second gradient. The second gradient is longer than the first gradient.
11. The single-cell battery according to claim 10, characterized in that, The length difference between the second gradient and the first gradient is greater than or equal to 2 mm and less than or equal to 10 mm.
12. A battery pack, characterized in that, Includes the single-cell battery as described in any one of claims 1 to 11.