Tab structure, soft package battery and electric equipment

Abstract

The invention relates to a tab structure, a soft package battery and electric equipment, and belongs to the technical field of power batteries. A punching table structure is arranged on a tab, the punching table structure is configured to be provided with at least one open side part, parameters of the height, the thickness ratio, the edge fillet and the punching angle of a punching table are limited, the bending modulus of a material is optimized, stress is dispersed, and the tab is prevented from being deformed and fractured; by limiting the ratio of the thickness to the height, the thickness of the tab is reduced to the greatest extent on the premise of ensuring the strength, the material is thinned, the manufacturing cost is reduced, the processing stability and the battery safety are improved, and the service life is prolonged.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to electrode structures, pouch batteries, and electrical equipment. Background Technology With the development of battery technology, pouch batteries have emerged. Pouch batteries have advantages such as high energy density, small size, and light weight, and have a large application market. Pouch batteries are mainly composed of tabs, electrode arrays, and encapsulation films. The encapsulation film encapsulates the electrode arrays and tabs, and is sealed by hot pressing.

[0002] In related technologies, the tabs of a pouch battery are flat plates. After being stacked into a PACK, the circuit is made conductive by welding the positive and negative tabs to a busbar.

[0003] Under the operating conditions of a vehicle, the electrode tabs will be subjected to stress. If the plate thickness remains unchanged or is reduced, the structural strength will be poor. With long-term use, they are prone to deformation under stress, which may lead to internal short circuits or cracks and fractures. Summary of the Invention

[0004] Therefore, it is necessary to address the above problems by providing a tab structure, a pouch battery, and an electrical device that strengthens the connecting tab to improve its structural strength. At the same time, the thickness of the connecting tab can be reduced to lower costs, thereby improving the product quality of the pouch battery and avoiding the risk of failure during use.

[0005] A pole ear structure, comprising: A connecting piece, wherein at least one punch structure is provided on the connecting piece; At least one side of the punching platform structure is configured as an open structure; The structure of the connecting piece defines the length, width, and thickness directions. In the thickness direction, the height Y1 of the punching platform structure satisfies: 0.2mm ≤ Y1 ≤ 50mm; In the thickness direction, the thickness t1 of the connecting piece satisfies: 0.15mm ≤ t1 ≤ 10mm; The ratio between the height Y1 of the punching platform structure and the thickness t1 of the connecting piece satisfies: 0.5 ≤ Y1 / t1 ≤ 5.

[0006] In one embodiment, the distance X1 between the punch structure and the tab adhesive in the width direction satisfies: 0.5mm ≤ X1 ≤ 50mm.

[0007] In one embodiment, the radius R2 of the transition fillet between the punching platform structure and the connecting piece satisfies: 0.5mm ≤ R2 ≤ 5mm.

[0008] In one embodiment, the corner radius R1 based on the ratio Y1 / t1 satisfies one of the following conditions: When 0.5 ≤ Y1 / t1 < 1, 0.5mm ≤ R1 ≤ 5mm; When 1 ≤ Y1 / t1 < 2.6, 1.5mm ≤ R1 ≤ 5mm; When 2.6 ≤ Y1 / t1 ≤ 5, 3mm ≤ R1 ≤ 5mm.

[0009] In one embodiment, the included angle A formed between the stamping wall surface and the stamping bottom surface of the stamping platform structure satisfies: 95° ≤ A ≤ 160°.

[0010] In one embodiment, the transition fillet radius R2 between the punching platform structure and the connecting piece satisfies: 0.5mm ≤ R2 ≤ 5mm.

[0011] In one embodiment, the distance e between the punch structure and the near edge of the connecting piece in the longitudinal direction satisfies: 0.5mm ≤ e ≤ 20mm.

[0012] In one embodiment, when there are multiple punching structures, the distance f between adjacent punching structures in the length direction satisfies: 1mm ≤ f ≤ 30mm.

[0013] On the other hand, this application also provides a pouch battery, including the above-mentioned tab structure, wherein the connecting piece is connected to the battery cell.

[0014] On the other hand, this application also provides an electrical device that is powered by the aforementioned pouch battery.

[0015] The aforementioned tab structure, by setting at least one punch structure on the connecting piece to form a localized reinforced area, can effectively disperse external loads and resist bending and tensile stresses. The punch structure effectively alleviates fatigue stress accumulation under long-term cyclic loading, extending battery life. Simultaneously, this application optimizes the flexural section modulus of the material by limiting the ratio of the punch height (0.2mm ≤ Y1 ≤ 50mm) to the connecting piece thickness (0.15mm ≤ t1 ≤ 10mm) (0.5 ≤ Y1 / t1 ≤ 5), avoiding insufficient strength due to thickness reduction. Furthermore, by limiting the thickness-to-height ratio (Y1 / t1), the tab thickness is minimized to the maximum extent while ensuring strength, achieving material thinning and reducing manufacturing costs. This application also has the following advantages: (1) The design of the fillet radius R1 and transition fillet radius R2 of the punching platform in this application (0.5mm~5mm) reduces the shear stress concentration during stamping and prevents the metal plate from cracking, thereby improving the overall structural durability; (2) This application limits the stamping wall angle (95° ≤ A ≤ 160°). This angle range balances the stamping difficulty and material utilization: if the angle is too small, it will easily lead to uneven wall formation, and if the angle is too large, it will waste welding space. This application limits the angle range to ensure the stability of the stamping process and avoid material waste. (3) This application limits the distance between the tab adhesive and the punching station (0.5mm ≤ X1 ≤ 50mm): the reasonable distance range avoids the interference problem during the tab encapsulation process, and at the same time prevents material redundancy caused by excessive distance, and simplifies the encapsulation process; (4) When there are multiple punching stations, the setting of the distance between adjacent punching stations (1mm ≤ f ≤ 30mm) makes the load distribution more uniform, avoids the cracking or breakage of the electrode lugs caused by local stress concentration, and thus reduces the risk of internal short circuit. (5) This application limits the edge distance between the punch and the near edge of the connecting piece (0.5mm ≤ e ≤ 20mm) to ensure a reasonable distance between the punch and the edge of the tab, prevent the edge material from tearing during stamping, and avoid potential safety hazards caused by processing defects. Attached Figure Description

[0016] Figure 1 This is a schematic diagram showing the interaction between the tab structure and the battery cell in this application.

[0017] Figure 2 This is a schematic diagram of the punching platform structure in one embodiment of this application.

[0018] Figure 3 for Figure 2 The main view.

[0019] Figure 4 for Figure 3 Side view.

[0020] Figure 5 for Figure 4 Enlarged view of part I (enlarged view of the transition fillet between the punching structure and the connecting piece).

[0021] Figure 6 This is a schematic diagram of the punching platform structure in another embodiment of this application.

[0022] Among them: 100, connecting piece; 200, battery cell; 300, punching platform structure; 400, electrode tab adhesive; 310. Stamped wall surface; 320. Stamped bottom surface. Detailed Implementation

[0023] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0024] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application.

[0025] Furthermore, where the terms "first" and "second" appear, these terms are 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 with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0029] See Figure 1 As shown, a soft-pack battery according to an embodiment of this application is illustrated, including a connecting piece 100, a cell 200, a punching structure 300, and an electrode adhesive 400, with the length direction, width direction, and thickness direction defined based on the structure of the connecting piece 100. The connecting piece 100 is connected to the battery cell 200 by the tab adhesive 400, and the battery cell 200 and the connecting piece 100 are sealed and encapsulated by the encapsulation film (not shown in the figure); the connecting piece 100 is provided with at least one punch structure 300, which is formed by the stamping process to form a local reinforcement area to improve the structural strength and deformation resistance of the connecting piece 100. Furthermore, at least one side of the punching platform structure 300 is configured as open; such as Figure 2 As shown, in one specific embodiment, two punching platform structures 300 are included, and each punching platform structure 300 has an open side; as another example... Figure 6 As shown, in another specific embodiment, a single punch structure is adopted, and a punch structure 300 is provided on the connecting piece 100. The punch structure 300 is configured to have two open sides.

[0030] In some embodiments, in the thickness direction, the height Y1 of the punching structure 300 satisfies: 0.2mm ≤ Y1 ≤ 50mm. The setting of the height Y1 balances the structural strength and space utilization: if Y1 is too small (<0.2mm), the structural reinforcement effect is insufficient; if Y1 is too large (>50mm), it occupies too much space and affects the battery packaging volume.

[0031] In some embodiments, in the thickness direction, the thickness t1 of the connecting piece 100 satisfies: 0.15mm ≤ t1 ≤ 10mm, and the ratio of the height Y1 of the punch structure 300 to the electrode thickness t1 satisfies: 0.5 ≤ Y1 / t1 ≤ 5. In a specific embodiment, when t1 is 0.3mm, the value of Y1 ranges from 0.15mm to 1.5mm; this ratio optimizes the flexural section modulus of the material, allowing the connecting piece 100 to be thinned to reduce costs while ensuring strength.

[0032] In some embodiments, the distance X1 between the punch structure 300 and the tab adhesive 400 in the width direction satisfies: 0.5mm ≤ X1 ≤ 50mm. This distance X1 setting avoids interference between the punch structure 300 and the tab adhesive 400 during processing, while also preventing material redundancy due to excessive spacing. In one specific embodiment, X1 is 2mm, allowing for smooth encapsulation of the tab adhesive 400 without requiring additional adjustments to encapsulation parameters.

[0033] In some embodiments, the fillet radius R1 of the punching platform structure 300 satisfies: 0.5mm ≤ R1 ≤ 5mm, specifically limited according to the ratio of Y1 / t1. When 0.5 ≤ Y1 / t1 < 1, 0.5mm ≤ R1 ≤ 5mm; When 1 ≤ Y1 / t1 < 2.6, 1.5mm ≤ R1 ≤ 5mm; When 2.6 ≤ Y1 / t1 ≤ 5, 3mm ≤ R1 ≤ 5mm; By limiting the radius R1 of the edge fillet, stress concentration during stamping is reduced, and cracking due to excessive shear force at the edge is avoided.

[0034] like Figure 4 As shown, in some embodiments, an included angle A is formed between the stamping wall surface 310 and the stamping bottom surface 320 of the stamping platform structure 300, wherein the included angle A satisfies: 95° ≤ A ≤ 160°; the range of angle A ensures the feasibility of the stamping process: if the stamping wall surface angle A is too small (<95°), the wall surface is difficult to form and the material thickness is uneven; if the stamping wall surface angle A is too large (>160°), the space for welding with the busbar is wasted.

[0035] In addition, the transition fillet radius R2 between the punching structure 300 and the connecting piece 100 satisfies: 0.5mm ≤ R2 ≤ 5mm, which further alleviates stress concentration during punching.

[0036] In some embodiments, the edge distance e between the punch structure 300 and the edge of the connecting piece 100 in the longitudinal direction satisfies: 0.5mm ≤ e ≤ 20mm; the limitation of the edge distance e prevents the edge of the connecting piece 100 from tearing during stamping, while avoiding wasted space.

[0037] When there are multiple punching platform structures 300, the distance f between adjacent punching platform structures 300 in the length direction satisfies: 1mm ≤ f ≤ 30mm. This distance ensures uniform load distribution and reduces the risk of fracture caused by local stress concentration.

[0038] In other embodiments, this application also provides an electrical device powered by the aforementioned pouch battery.

[0039] This application conducts experiments based on the height Y1 of the punching platform structure 300 in the thickness direction, the thickness t1 of the connecting piece 100 in the thickness direction, the ratio of Y1 / t1, the radius of the edge fillet R1 of the punching platform structure 300, and the range of the transition fillet radius R2 between the punching platform structure 300 and the connecting piece 100. The results are shown in Table 1.

[0040] Table 1

[0041] Analysis of the data in Table 1 shows that when Y1 / t1 > 5, stamping will cause cracks in the groove wall of the metal plate; when 0.5 ≤ Y1 / t1 < 1 and R1 < 0.5 mm, stamping will cause cracks in the fillet radius R1 of the metal plate edge; when 1 ≤ Y1 / t1 < 2.6 and R1 < 1.5 mm, stamping will cause cracks in the fillet radius R1 of the metal plate edge; and when 2.6 ≤ Y1 / t1 ≤ 5 and R1 < 3 mm, stamping will cause cracks in the fillet radius R1 of the metal plate edge. When R2 < 0.5mm, the metal plate edge radius R2 will crack during stamping.

[0042] In summary, this application connects the connecting piece 100 to the battery cell 200, forming a pouch battery after encapsulation. The mechanical strengthening effect of the punch structure 300 significantly improves the bending and tensile strength of the connecting piece 100, effectively preventing deformation, cracking, or internal short circuits during long-term use. Furthermore, this application also minimizes the tab thickness while ensuring strength by limiting the ratio (Y1 / t1) between the height Y1 of the punch structure 300 in the thickness direction and the thickness t1 of the connecting piece 100 in the thickness direction. This achieves material thinning, reduces material costs, and the optimized parameters of the punch structure ensure the stability of the processing technology and packaging efficiency.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A tab structure, characterized in that, include: A connecting piece, wherein at least one punch structure is provided on the connecting piece; At least one side of the punching platform structure is configured to be open; The structure of the connecting piece defines the length, width, and thickness directions. In the thickness direction, the height Y1 of the punching platform structure satisfies: 0.2mm ≤ Y1 ≤ 50mm; In the thickness direction, the thickness t1 of the connecting piece satisfies: 0.15mm ≤ t1 ≤ 10mm; The ratio between the height Y1 of the punching platform structure and the thickness t1 of the connecting piece satisfies: 0.5 ≤ Y1 / t1 ≤ 5.

2. The electrode structure according to claim 1, characterized in that, In the width direction, the distance X1 between the punching platform structure and the tab adhesive satisfies: 0.5mm ≤ X1 ≤ 50mm.

3. The electrode structure according to claim 1, characterized in that, The radius R1 of the corner fillet of the punching platform structure satisfies: 0.5mm ≤ R1 ≤ 5mm.

4. The electrode structure according to claim 3, characterized in that, The fillet radius R1 of the edge, based on the ratio of Y1 / t1, satisfies one of the following conditions: When 0.5 ≤ Y1 / t1 < 1, 0.5mm ≤ R1 ≤ 5mm; When 1 ≤ Y1 / t1 < 2.6, 1.5mm ≤ R1 ≤ 5mm; When 2.6 ≤ Y1 / t1 ≤ 5, 3mm ≤ R1 ≤ 5mm.

5. The electrode structure according to claim 1, characterized in that, An angle A is formed between the stamping wall surface and the stamping bottom surface of the stamping platform structure, and the included angle A satisfies: 95° ≤ A ≤ 160°.

6. The electrode structure according to claim 1, characterized in that, The radius R2 of the transition fillet between the punching platform structure and the connecting piece satisfies: 0.5mm ≤ R2 ≤ 5mm.

7. The electrode structure according to claim 1, characterized in that, In the length direction, the distance e between the punching platform structure and the near edge of the connecting piece satisfies: 0.5mm ≤ e ≤ 20mm.

8. The electrode structure according to claim 1, characterized in that, When there are multiple punching structures, the distance f between adjacent punching structures in the length direction satisfies: 1mm ≤ f ≤ 30mm.

9. A pouch battery, characterized in that, Includes the tab structure as described in any one of claims 1-8.

10. An electrical appliance, characterized in that, Includes the pouch battery as described in claim 9, through which the electrical device is powered.

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