Tab structure

Abstract

The utility model relates to the technical field of battery processing, and particularly discloses a tab structure which is arranged on a pole piece, has a first direction and a second direction which are intersected, and comprises a tab non-welding area and a tab welding area, the tab non-welding area is connected to the pole piece in the first direction, the tab non-welding area is of a trapezoidal structure, and the surface of the tab non-welding area is coated with an insulating gluing layer; the tab welding area is connected to the tab non-welding area along the first direction; wherein the height of the tab non-welding area in the first direction is H2, the height of the tab welding area in the first direction is H1, and the H1 and the H2 meet the condition that H2 is larger than H1. According to the utility model, the tab non-welding area is designed into the trapezoidal structure, so that the tab folding problem in the winding process of the tab can be effectively solved, the surface of the tab non-welding area is coated with the insulating gluing layer, the structural strength of the tab non-welding area is enhanced, short circuit in the battery can be avoided, and the safety risk is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery processing technical field, especially a tab structure. BACKGROUND

[0002] At present, lithium ion batteries have two ways of making roll cores according to assembly process, namely, laminating and winding, wherein the winding process has high efficiency. Multi-tab winding needs to use a die cutting machine to cut multiple tabs, and the tab after die cutting is prone to folding during the passing roller process, especially when 5 mu m copper foil is used. Tab folding refers to the deformation or folding of the tab during battery manufacturing or use, which may cause internal short circuit, and in severe cases, it may cause safety problems of the battery.

[0003] In order to solve the problem of tab folding of lithium battery, the existing method has the following two solutions: (1) using reinforcing ribs to increase the design before tab cutting; (2) changing the shape and material of the tab to ensure its strength and toughness.

[0004] However, the above two solutions still have the problems of tab folding and short circuit after folding, which cannot guarantee the processing quality and cannot meet the high efficiency demand. INVENTION CONTENTS

[0005] The technical problem to be solved by the utility model is how to solve the problems of tab folding in the winding process and internal short circuit of the battery after folding.

[0006] In order to solve the above technical problem, the utility model provides a tab structure arranged on a tab, having a first direction and a second direction intersecting each other, comprising:

[0007] a tab non-welding area connected to the tab along the first direction, the tab non-welding area being a trapezoidal structure, and the surface of the tab non-welding area being coated with an insulating glue layer; and

[0008] a tab welding area connected to the tab non-welding area along the first direction;

[0009] Among them, the height of the tab non-welding area in the first direction is H2, the height of the tab welding area in the first direction is H1, and H1, H2 satisfy: H2> H1.

[0010] Further preferably, the width of the end of the tab non-welding area away from the tab in the second direction is equal to the width of the tab welding area in the second direction.

[0011] Further preferably, a width of the tab non-welding area away from one end of the tab is L1 in the second direction, and a width of the tab non-welding area close to one end of the tab is L2 in the second direction;

[0012] wherein the L1, L2 satisfy: L2>L1.

[0013] Further preferably, the tab non-welding area is in an isosceles trapezoidal structure.

[0014] Further preferably, an included angle between a hypotenuse and a base of the tab non-welding area is θ, and the included angle θ satisfies: 30°≤θ≤60°.

[0015] Further preferably, one end of the tab welding area away from the tab non-welding area is provided with a circular arc, and an R angle of the circular arc is 2-5mm.

[0016] Further preferably, a thickness of the insulating adhesive layer is 10-15μm.

[0017] Further preferably, the heights H1, H2 satisfy: 5mm≤H1<10mm, and 10≤H2≤15mm.

[0018] Compared with the prior art, the tab structure has the beneficial effects that:

[0019] The tab is designed into a tab non-welding area and a tab welding area, the purpose of the tab welding area is to ensure welding of the tab, the tab non-welding area is designed into a trapezoidal structure, which can effectively solve the problem of tab folding in the winding process, the surface of the tab non-welding area is coated with an insulating adhesive layer, the structural strength of the tab non-welding area is enhanced, the phenomenon of tab folding in the winding process can be avoided, the insulation of the tab non-welding area is ensured, in addition, the height H2 of the tab non-welding area in the first direction is limited to be greater than the height H1 of the tab welding area in the first direction, even if the tab welding area accidentally folds, the contact is also the insulating adhesive layer, which will not cause short circuit in the battery, reduce the safety risk, improve the battery processing quality, and meet the high efficiency requirement. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic view of the tab structure.

[0021] Reference signs:

[0022] 10, tab;

[0023] 20, tab non-welding area;

[0024] 30, tab welding area. DETAILED DESCRIPTION

[0025] The specific embodiments of the present application will be further described in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0026] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the 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 in the present application are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0027] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0028] In addition, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; 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, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0030] It is to be noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used herein are for the purpose of description only and are not intended to be limiting.

[0031] As shown in Figure 1 The embodiment provides a tab structure, which is arranged on the tab sheet 10 and has intersecting first direction X and second direction Y.

[0032] In some embodiments, the first direction X and the second direction Y are perpendicular to each other.

[0033] In some embodiments, the tab structure includes a tab non-welding area 20 and a tab welding area 30; the tab non-welding area 20 is connected to the tab sheet 10 along the first direction X, the tab non-welding area 20 is a trapezoidal structure, and the surface of the tab non-welding area 20 is coated with an insulating adhesive layer; the tab welding area 30 is connected to the tab non-welding area 20 along the first direction X; the tab is designed as the tab non-welding area 20 and the tab welding area 30 in the embodiment, the purpose of the tab welding area 30 is to ensure the welding of the tab, the tab non-welding area 20 is designed as a trapezoidal structure, which can effectively solve the tab folding problem in the winding process, the surface of the tab non-welding area 20 is coated with an insulating adhesive layer, which enhances the structural strength of the tab non-welding area 20 and can avoid the tab folding phenomenon in the winding process, and also ensures the insulation of the tab non-welding area 20.

[0034] In some embodiments, in order to avoid short circuit inside the battery during the winding process, the height of the tab non-welding area 20 in the first direction X is H2, the height of the tab welding area 30 in the first direction X is H1, and H1 and H2 satisfy: H2>H1. In the embodiment, the height H2 of the tab non-welding area 20 in the first direction X is greater than the height H1 of the tab welding area 30 in the first direction X, so even if the tab welding area 30 accidentally folds, it will contact the insulating adhesive layer and will not cause short circuit inside the battery, thereby reducing the safety risk, improving the battery processing quality, and meeting the high efficiency demand.

[0035] In some embodiments, the width of the end of the tab non-welding area 20 away from the tab sheet 10 in the second direction Y is equal to the width of the tab welding area 30 in the second direction Y.

[0036] In some embodiments, the tab non-welding area 20 is in the shape of an isosceles trapezoid. The width of the tab non-welding area 20 away from the tab 10 in the second direction Y is L1, and the width of the tab non-welding area 20 close to the tab 10 in the second direction Y is L2; wherein L1, L2 satisfy: L2>L1. Designing the tab non-welding area 20 in the shape of an isosceles trapezoid with a narrow top and a wide bottom can effectively solve the problem of tab folding during winding.

[0037] In some embodiments, the angle between the hypotenuse and the base of the tab non-welding area 20 is θ, and the angle θ satisfies: 30°≤θ≤60°; in some preferred embodiments, the angle θ is preferably 45°.

[0038] In some embodiments, the end of the tab welding area 30 away from the tab non-welding area 20 is provided with a circular arc, and the R angle of the circular arc is 2-5mm, and in some preferred embodiments, the R angle is 3mm.

[0039] In some embodiments, the thickness of the insulating adhesive layer is 10-15μm; in some preferred embodiments, the thickness of the insulating adhesive layer is 12μm, so as to ensure the structural strength and insulation performance of the tab non-welding area 20.

[0040] In some embodiments, the heights H1, H2 satisfy: 5mm≤H1<10mm, 10≤H2≤15mm, so as to ensure that the tab welding area 30 contacts the insulating adhesive layer after being bent, and short circuit does not occur inside the battery.

[0041] In summary, the embodiment of the utility model provides a tab structure, which designs the tab into a tab non-welding area 20 and a tab welding area 30, wherein the purpose of the tab welding area 30 is to ensure the welding of the tab, the tab non-welding area 20 is designed in the shape of a trapezoid, which can effectively solve the problem of tab folding during winding, the surface of the tab non-welding area 20 is coated with an insulating adhesive layer, which enhances the structural strength of the tab non-welding area 20, avoids the phenomenon of tab folding during winding, ensures the insulation of the tab non-welding area 20, and limits the height H2 of the tab non-welding area 20 in the first direction X to be greater than the height H1 of the tab welding area 30 in the first direction X, so that even if the tab welding area 30 accidentally folds, it contacts the insulating adhesive layer, short circuit does not occur inside the battery, the safety risk is reduced, the battery processing quality is improved, and the high efficiency requirement is met.

[0042] The above merely describes preferred embodiments of the present application, and it should be noted that, for those skilled in the art, some improvements and replacements can be made without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application. The basic principles, main features and advantages of the present application are shown and described above, and it is obvious for those skilled in the art that the present application is not limited to the details of the above preferred embodiments, and the embodiments should be considered as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims should be included in the present application.

[0043] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in the embodiments can also be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A tab structure provided in a tab, having a first direction and a second direction intersecting each other, characterized by, Comprise: A tab non-welding area connected to the tab piece along the first direction, the tab non-welding area is a trapezoidal structure, and the surface of the tab non-welding area is coated with an insulating glue layer; and A tab welding area connected to the tab non-welding area along the first direction; Wherein, the height of the tab non-welding area in the first direction is H2, the height of the tab welding area in the first direction is H1, and the H1, H2 satisfy: H2>H1.

2. The tab structure of claim 1, wherein, The width of the end of the tab non-welding area away from the tab piece in the second direction is equal to the width of the tab welding area in the second direction.

3. The tab structure of claim 1, wherein, The width of the end of the tab non-welding area away from the tab piece in the second direction is L1, and the width of the end of the tab non-welding area close to the tab piece in the second direction is L2; Wherein, the L1, L2 satisfy: L2>L1.

4. The tab structure of claim 1, wherein, The tab non-welding area is an isosceles trapezoidal structure.

5. The tab structure of claim 4, wherein, The included angle between the oblique side and the bottom side of the tab non-welding area is θ, and the included angle θ satisfies: 30°≤θ≤60°.

6. The tab structure of claim 1, wherein, The end of the tab welding area away from the tab non-welding area is provided with a circular arc, and the R angle of the circular arc is 2-5mm.

7. The tab structure of claim 1, wherein, The thickness of the insulating glue layer is 10-15μm.

8. The tab structure of claim 1, wherein, The height H1, H2 satisfy: 5mm≤H1<10mm, 10≤H2≤15mm.

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