Tab structure, soft package battery and electric device

Abstract

The application relates to a tab structure, a soft package battery and an electric equipment, and belongs to the technical field of power batteries. The tab structure is provided with a punching platform structure, the punching platform structure is configured to have at least one open side, and the parameters of the punching platform height, the thickness ratio, the edge roundness and the punching angle are limited, the material bending modulus is optimized, the stress is dispersed, and the tab deformation and fracture are prevented; by limiting the thickness to height ratio, the tab thickness is maximally reduced under 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] The present application relates to the technical field of power batteries, in particular to a tab structure, a soft package battery and an electric device. BACKGROUND

[0002] With the development of battery technology, soft package batteries appear; soft package batteries have the advantages of large specific energy, small volume, light weight and large application market. The soft package battery is mainly composed of a tab, a pole group and a packaging film. The pole group and the tab are packaged by the packaging film, and the packaging film is sealed by hot pressing.

[0003] In the related art, the soft package battery tab is a flat plate, which is stacked into a PACK, and the circuit is turned on by welding the positive and negative tabs to the bus bar.

[0004] Under the whole vehicle use condition, the tab will be stressed. In the case of unchanged or thinned plate thickness, the structural strength is poor, and long-term use is prone to stress deformation, internal short circuit or cracking. SUMMARY

[0005] Therefore, it is necessary to provide a tab structure, a soft package battery and an electric device to structure the connecting piece, improve the structural strength of the connecting piece, and also reduce the thickness of the connecting piece to reduce the cost, thereby providing the product quality of the soft package battery and avoiding the failure risk in use.

[0006] A tab structure comprises:

[0007] A connecting piece, at least one landing structure is arranged on the connecting piece;

[0008] At least one side of the landing structure is configured as an open structure;

[0009] The structure of the connecting piece defines a length direction, a width direction and a thickness direction;

[0010] In the thickness direction, the height Y1 of the landing structure satisfies: 0.2mm ≤ Y1 ≤ 50mm;

[0011] In the thickness direction, the thickness t1 of the connecting piece satisfies: 0.15mm ≤ t1 ≤ 10mm;

[0012] The ratio between the height Y1 of the landing structure and the thickness t1 of the connecting piece satisfies: 0.5 ≤ Y1 / t1 ≤ 5.

[0013] In one of the embodiments, in the width direction, the distance X1 between the landing structure and the tab glue satisfies: 0.5mm ≤ X1 ≤ 50mm.

[0014] In one of the embodiments, the radius R2 of the transition fillet between the punch platform structure and the connecting piece satisfies: 0.5mm≤R2≤5mm.

[0015] In one of the embodiments, the edge fillet radius R1 based on the ratio of Y1 / t1 satisfies one of the following conditions:

[0016] When 0.5≤Y1 / t1<1, 0.5mm≤R1≤5mm;

[0017] When 1≤Y1 / t1<2.6, 1.5mm≤R1≤5mm;

[0018] When 2.6≤Y1 / t1≤5, 3mm≤R1≤5mm.

[0019] In one of the embodiments, the included angle A between the punch wall surface and the punch bottom surface of the punch platform structure satisfies: 95°≤A≤160°.

[0020] In one of the embodiments, the radius R2 of the transition fillet between the punch platform structure and the connecting piece satisfies: 0.5mm≤R2≤5mm.

[0021] In one of the embodiments, in the length direction, the edge distance e between the punch platform structure and the proximal edge of the connecting piece satisfies: 0.5mm≤e≤20mm.

[0022] In one of the embodiments, when the number of the punch platform structures is multiple, the spacing f in the length direction between adjacent punch platform structures satisfies: 1mm≤f≤30mm.

[0023] In another aspect, the application further provides a soft package battery comprising the above-mentioned tab structure, and the connecting piece is connected with the battery cell.

[0024] In another aspect, the application further provides an electric device, which is powered by the above-mentioned soft package battery.

[0025] The tab structure described above forms a local reinforcement area by providing at least one punch platform structure on the connecting piece, which can effectively disperse external load, resist bending and tensile stress, effectively alleviate fatigue stress accumulation under long-term cyclic load through the punch platform structure, and prolong the service life of the battery; at the same time, the ratio (0.5 ≤ Y1 / t1 ≤ 5) of the height of the punch platform (0.2mm ≤ Y1 ≤ 50mm) to the thickness of the connecting piece (0.15mm ≤ t1 ≤ 10mm) optimizes the bending section modulus of the material, avoiding insufficient strength caused by thickness reduction; in addition, by limiting the ratio of thickness to height (Y1 / t1), the thickness of the tab is maximally reduced under the premise of ensuring strength, realizing material thinning and reducing manufacturing cost.

[0026] The present application also has the following advantages:

[0027] (1) The design of the punch platform edge fillet radius R1 and the transition fillet radius R2 (0.5mm-5mm) reduces the shear stress concentration during stamping forming, prevents the metal plate from being torn, and thus improves the overall structural durability;

[0028] (2) The present application limits the stamping wall angle (95° ≤ A ≤ 160°), which balances the stamping forming difficulty and material utilization rate: too small angle is easy to cause uneven wall forming, and too large angle wastes welding space, while the present application limits the angle range to ensure the stability of the stamping process and avoid material waste;

[0029] (3) The present application limits the distance between the tab rubber and the punch platform (0.5mm ≤ X1 ≤ 50mm): a reasonable distance range avoids interference problems during tab rubber processing, and at the same time prevents material redundancy caused by too large distance, and simplifies the packaging process;

[0030] (4) When the number of punch platforms is multiple, the setting of the distance between adjacent punch platforms (1mm ≤ f ≤ 30mm) makes the load distribution more uniform, avoids tab cracking or breaking caused by local stress concentration, and thus reduces the risk of internal short circuit;

[0031] (5) The present application limits the edge distance (0.5mm ≤ e ≤ 20mm) between the punch platform and the proximal edge of the connecting piece, ensures the reasonable distance between the punch platform and the edge of the tab, prevents the edge material from tearing during stamping, and avoids potential safety hazards caused by processing defects. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic diagram of the cooperation state of the tab structure and the battery cell in the present application.

[0033] Figure 2 is a schematic diagram of the punch platform structure in an embodiment of the present application.

[0034] Figure 3 is a front view of Figure 2

[0035] Figure 4 is a side view of Figure 3

[0036] Figure 5 is an enlarged view of I part in Figure 4

[0037] Figure 6 is a schematic view of the punch platform structure in another embodiment of the present application.

[0038] Wherein: 100, connecting piece; 200, battery cell; 300, punch platform structure; 400, tab rubber;

[0039] 310, punch wall surface; 320, punch bottom surface. DETAILED DESCRIPTION

[0040] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is to be understood that the present application is not limited in this regard. In other instances, well-known methods have not been described in detail in order to avoid unnecessarily obscuring the present application.

[0041] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0042] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.​​​

[0043] In the present application, unless specifically defined and limited otherwise, if there is a description of the term "installation", "connection", "connection", "fixation" and the like, these terms should be broadly interpreted. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the present application, unless specifically defined and limited otherwise, if there is a description of the term "installation", "connection", "connection", "fixation" and the like, these terms should be broadly interpreted. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and are not the only embodiment.

[0046] Referring to Figure 1 As shown, a soft package battery in an embodiment of the present application is shown, including a connecting sheet 100, a battery cell 200, a punching platform structure 300, and a tab rubber 400, and the length direction, the width direction, and the thickness direction are defined based on the structure of the connecting sheet 100;

[0047] The connecting sheet 100 is connected with the battery cell 200 through the tab rubber 400, and the battery cell 200 and the connecting sheet 100 are sealed and packaged by a packaging film (not shown in the figure); The connecting sheet 100 is provided with at least one punching platform structure 300, which is formed by a punching process to form a local reinforcement area for improving the structural strength and deformation resistance of the connecting sheet 100;

[0048] Further, at least one side of the punching platform structure 300 is configured to be open; as Figure 2As shown, in one embodiment, two punch platform structures 300 are included, and each punch platform structure 300 has an open side; as further shown Figure 6 As shown, in another embodiment, a single punch platform structure is used, and a punch platform structure 300 is arranged on the connecting sheet 100, and the punch platform structure 300 is configured to have two open sides.

[0049] In some embodiments, in the thickness direction, the height Y1 of the punch platform structure 300 satisfies: 0.2mm ≤ Y1 ≤ 50mm, and the height Y1 is set to balance the structural strength and space utilization: if Y1 is too small (<0.2mm), the structural strengthening effect is insufficient; if Y1 is too large (>50mm), too much space is occupied, affecting the battery packaging volume.

[0050] In some embodiments, in the thickness direction, the thickness t1 of the connecting sheet 100 satisfies: 0.15mm ≤ t1 ≤ 10mm, and the ratio of the height Y1 of the punch platform structure 300 to the tab thickness t1 satisfies: 0.5 ≤ Y1 / t1 ≤ 5. In one embodiment, when t1 is 0.3mm, the value range of Y1 is 0.15mm to 1.5mm; the ratio optimizes the bending section modulus of the material, allowing the connecting sheet 100 to be thinned to reduce costs while ensuring strength.

[0051] In some embodiments, in the width direction, the distance X1 between the punch platform structure 300 and the tab rubber 400 satisfies: 0.5mm ≤ X1 ≤ 50mm; the distance X1 is set to avoid interference between the punch platform structure 300 and the tab rubber 400 during processing, while preventing material redundancy due to excessive distance. In one embodiment, X1 is 2mm, and the tab rubber 400 can be smoothly coated without additional adjustment of the packaging parameters.

[0052] In some embodiments, the edge radius R1 of the punch platform structure 300 satisfies: 0.5mm ≤ R1 ≤ 5mm, which is further limited according to the ratio of Y1 / t1:

[0053] When 0.5 ≤ Y1 / t1 <1, 0.5mm ≤ R1 ≤ 5mm;

[0054] When 1 ≤ Y1 / t1 <2.6, 1.5mm ≤ R1 ≤ 5mm;

[0055] When 2.6 ≤ Y1 / t1 ≤ 5, 3mm ≤ R1 ≤ 5mm;

[0056] By limiting the edge radius R1, stress concentration during stamping is reduced, and the edge is prevented from being pulled apart due to excessive shear force.

[0057] As shown,Figure 4 As shown, in some embodiments, the angle A between the punching wall surface 310 and the punching bottom surface 320 of the punching platform structure 300 satisfies: 95° ≤ A ≤ 160°; the range of the angle A ensures the feasibility of the punching process: if the punching wall surface angle A is too small (< 95°), the wall surface is difficult to form and the material thickness is uneven; if the punching wall surface angle A is too large (> 160°), the space for welding the busbar is wasted.

[0058] In addition, the transition fillet radius R2 between the punching platform structure 300 and the connecting sheet 100 satisfies: 0.5mm ≤ R2 ≤ 5mm, which further relieves the stress concentration during punching.

[0059] In some embodiments, in the length direction, the edge distance e of the punching platform structure 300 and the connecting sheet 100 edge satisfies: 0.5mm ≤ e ≤ 20mm; the limitation of the edge distance e prevents the connecting sheet 100 edge from tearing during punching, while avoiding space waste.

[0060] When the number of the punching platform structure 300 is multiple, the spacing f in the length direction between adjacent punching platform structures 300 satisfies: 1mm ≤ f ≤ 30mm, which ensures the uniform distribution of load and reduces the risk of fracture caused by local stress concentration.

[0061] In addition, in other embodiments, the application also provides a power-using equipment powered by the soft package battery described above.

[0062] Based on the height Y1 of the punching platform structure 300 in the thickness direction, the thickness t1 of the connecting sheet 100 in the thickness direction, the ratio of Y1 / t1, the edge fillet radius R1 of the punching platform structure 300, and the numerical range of the transition fillet radius R2 between the punching platform structure 300 and the connecting sheet 100, experiments are conducted, and the results are shown in Table 1.

[0063] Table 1

[0064]

[0065] Through the analysis of the data in Table 1, it can be known that when Y1 / t1 > 5, the metal plate groove wall will crack during punching; when 0.5 ≤ Y1 / t1 < 1 and R1 < 0.5mm, the metal plate edge fillet R1 will crack during punching; when 1 ≤ Y1 / t1 < 2.6 and R1 < 1.5mm, the metal plate edge fillet R1 will crack during punching; when 2.6 ≤ Y1 / t1 ≤ 5 and R1 < 3mm, the metal plate edge fillet R1 will crack during punching;

[0066] When R2 < 0.5mm, the metal plate edge fillet R2 will crack during punching.

[0067] In summary, the connecting piece 100 is connected with the battery cell 200, and a soft package battery is formed after packaging. The mechanical strengthening effect of the punching platform structure 300 significantly improves the bending and tensile resistance of the connecting piece 100, and can effectively avoid deformation, cracking or internal short circuit in long-term use. At the same time, by limiting the ratio (Y1 / t1) between the height Y1 of the punching platform structure 300 in the thickness direction and the thickness t1 of the connecting piece 100 in the thickness direction, the thickness of the tab is maximally reduced under the premise of ensuring the strength, the material is thinned, the material cost is reduced, and the parameter optimization of the punching platform structure ensures the stability of the processing technology and the packaging efficiency.

[0068] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0069] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A tab structure, characterized by, The application relates to a tab structure of a soft package battery. The tab structure comprises a connecting piece and at least one punching platform structure arranged on the connecting piece. At least one side of the punching platform structure is open. The structure of the connecting piece defines a length direction, a width direction and a thickness direction. 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. In the width direction, the distance X1 between the punching platform structure and the jelly roll glue satisfies 0.5mm <= X1 <= 50mm. The edge rounding radius R1 of the punching platform structure satisfies 0.5mm <= R1 <= 5mm. The edge rounding radius R1 of the punching platform structure satisfies the following conditions based on the ratio 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.

2. The tab structure of claim 1, wherein, The punching wall surface and the punching bottom surface of the punching platform structure form an included angle A, and the included angle A satisfies 95° <= A <= 160°.

3. The tab structure of claim 1, wherein, The radius R2 of the transition rounding between the punching platform structure and the connecting piece satisfies 0.5mm <= R2 <= 5mm.

4. The tab structure of claim 1, wherein, In the length direction, the edge distance e between the punching platform structure and the proximal edge of the connecting piece satisfies 0.5mm <= e <= 20mm.

5. The tab structure of claim 1, wherein When the number of the punching platform structures is multiple, the distance f between adjacent punching platform structures in the length direction satisfies 1mm <= f <= 30mm.

6. A pouch battery, characterized by, The application further relates to a soft package battery comprising the tab structure of any one of claims 1-5.

7. An electric device, characterized by The application further relates to a use of the soft package battery of claim 6 to supply power to the electric device.

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