CN219156800U - Adhesive tape for welding battery tab, welding structure and battery - Google Patents

Abstract

The utility model relates to a battery tab welding adhesive tape, a welding structure and a battery, wherein the battery tab welding adhesive tape comprises a base material; the middle part of one side surface of the base material is coated with an adhesive layer; the melting point of the substrate is 120-200 ℃. When the adhesive tape is used for bonding the final welding and printing positions of the electrode lugs, the adhesive tape can be bonded to the final welding and printing positions of the electrode lugs by means of the bonding force of the bonding layer. In addition, the base material can be heated to 120-200 ℃ by the heating strip or the heat source, and the base material is slightly dissolved and thermally adhered with the adhesive layer, so that the adhesive force of the adhesive tape is further improved. Therefore, in the subsequent processing and using process of the lithium ion battery, the adhesive tape is not easy to fall off spontaneously, and metal dust particles remained on the electrode lugs can be prevented from falling into the electrode group or the battery core all the time. The adhesive tape is prevented from falling into the battery cells, so that the internal resistance of the battery cells is prevented from being increased sharply, and the consistency between the battery cells is good.

Description

Adhesive tape for welding battery tab, welding structure and battery

Technical Field

The utility model relates to the technical field of lithium ion batteries, in particular to an adhesive tape for welding battery lugs, a welding structure and a battery.

Background

The pole assembling process of the lithium ion battery comprises the following steps: first, the positive/negative electrode lugs are pre-welded, then the positive/negative electrode lugs are cut, and then the cut positive/negative electrode lugs and tab/adapter pieces are subjected to final welding. Wherein, when the positive/negative electrode lugs are cut, metal dust particles are generated. Generally, metal dust particles generated in the cutting process are transferred to a collecting tank or outside a workshop by adopting a negative pressure device, so that the metal dust residue at the cutting position of the tab is reduced. Therefore, when the cut positive/negative electrode lugs and tab sheets/transfer sheets are welded in a final welding mode, tea-colored high-temperature adhesive tapes are respectively adhered to the two opposite sides of a final welding and printing position, and the tea-colored high-temperature adhesive tapes are used as battery lug welding adhesive tapes, so that metal dust particles remained on the lugs are prevented from falling into a pole group or a battery, and further the phenomenon of micro short circuit inside the battery caused by the metal dust particles is avoided, and the problems of large self discharge, poor consistency among batteries and the like are alleviated.

The traditional adhesive tape for welding the battery lugs consists of a base material and a glue layer, wherein the base material is polyethylene terephthalate, and the glue is polyacrylic acid glue. The adhesive tape for welding the traditional battery tab is adhered to the final welding and stamping part of the tab depending on the adhesive force of the polyacrylic acid adhesive layer. In the subsequent processing and use process of the lithium ion battery, the conventional adhesive tape for welding the battery tab is often accompanied by automatic falling, and the effect of preventing metal dust particles remained on the tab from falling into the electrode group or the battery core is lost. The traditional battery tab welding adhesive tape capable of automatically falling off can even fall into the battery core, so that the internal resistance of the battery core is increased sharply, and the consistency difference between the battery cores is increased.

At present, the adhesive tape for welding the electrode lugs of the traditional battery is poor in adhesion and easy to spontaneously fall off from the final welding and stamping positions of the electrode lugs.

Disclosure of Invention

The utility model provides a battery tab welding adhesive tape, a welding structure and a battery, which are used for solving the problems that the adhesive tape for the traditional battery tab welding is poor in adhesion and easy to spontaneously fall off from a final welding and stamping position of the tab.

The utility model provides an adhesive tape for welding battery lugs, which comprises a base material;

the middle part of one side surface of the base material is coated with an adhesive layer;

the melting point of the substrate is 120-200 ℃.

In some embodiments, the substrate is polypropylene.

In some embodiments, the adhesive layer is a polyacrylic acid glue layer.

In some embodiments, a predetermined distance is left between the edge of the adhesive layer and the edge of the corresponding side of the substrate.

In some embodiments, the tape has a thickness L of 30 μm to 80 μm;

and/or the thickness D of the substrate is 20 μm to 60 μm;

and/or the thickness C of the adhesive layer is 10 μm to 20 μm.

In some embodiments, the substrate has a width W of 5mm to 46mm;

and/or the width B of the adhesive layer is 5mm-40mm.

In some embodiments, the method further comprises a release film layer;

the release film layer is attached to one side of the bonding layer far away from the base material.

The welding structure based on the same conception comprises a pole piece lug and the battery lug welding adhesive tape provided by any specific embodiment;

at least one side surface of the pole piece lug is attached with a battery lug welding adhesive tape.

In some embodiments, the battery tab welding adhesive tapes are respectively attached to the opposite side surfaces of the pole tab;

and/or, further comprising Tab/switch;

and the battery tab welding adhesive tape is attached to the welding points of the tab sheet/the switching sheet and the tab.

A battery based on the same conception comprises the battery tab welding adhesive tape provided by any of the specific embodiments or the welding structure provided by any of the specific embodiments.

The utility model has the beneficial effects that: according to the adhesive tape for welding the battery electrode lugs, the base material and the adhesive layer are arranged, the adhesive layer is coated on the middle part of one side surface of the base material, and the melting point of the base material is 120-200 ℃. When the adhesive tape for welding the battery tab is used for being adhered to the final welding and printing position of the tab, the adhesive tape can be adhered to the final welding and printing position of the tab by the adhesive force of the adhesive layer. In addition, the base material can be heated to 120-200 ℃ by the heating strip or the heat source, and the base material is slightly dissolved and thermally adhered with the adhesive layer, so that the adhesive force of the adhesive tape is further improved. Therefore, in the subsequent processing and using process of the lithium ion battery, the adhesive tape for welding the battery tab is not easy to fall off spontaneously, and the metal dust particles remained on the tab can be prevented from falling into the electrode group or the battery core all the time. The adhesive tape is prevented from falling into the battery cells, so that the internal resistance of the battery cells is prevented from being increased sharply, and the consistency between the battery cells is good.

Drawings

FIG. 1 is a front view of some embodiments of a battery tab welding tape according to the present utility model;

FIG. 2 is a top view of the battery tab welding tape shown in FIG. 1;

fig. 3 is a schematic view of a welded structure (with the battery tab welding tape removed);

FIG. 4 is a schematic view of a weld configuration of the present utility model;

fig. 5 is a partial enlarged view of the region F in fig. 4.

110, a substrate in the drawing; 120. an adhesive layer; 200. pole piece lugs; 300. and a switching piece.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

Examples of the embodiments are illustrated in the accompanying drawings, wherein like or similar symbols indicate like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "top," "bottom," "inner," "outer," "axis," "circumferential," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the present utility model or simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," "engaged," "hinged," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

As described in the background art, the conventional battery tab welding tape is composed of a substrate and a glue layer, wherein the substrate 110 is made of polyethylene terephthalate, and the glue is polyacrylic glue. The adhesive tape for welding the traditional battery tab is adhered to the final welding and stamping part of the tab depending on the adhesive force of the polyacrylic acid adhesive layer. In the subsequent processing and use process of the lithium ion battery, the conventional adhesive tape for welding the battery tab is often accompanied by automatic falling, and the effect of preventing metal dust particles remained on the tab from falling into the electrode group or the battery core is lost. The traditional battery tab welding adhesive tape capable of automatically falling off can even fall into the battery core, so that the internal resistance of the battery core is increased sharply, and the consistency difference between the battery cores is increased.

In order to improve the above problems, in one aspect of the present application, there is provided a battery tab welding tape, referring to fig. 1 and 2, which includes a base material 110 and an adhesive layer 120. The middle of one side of the substrate 110 is coated with an adhesive layer 120. The melting point of the substrate 110 is 120-200 ℃.

It should be noted that, for the conventional adhesive tape for welding the battery tab, the material of the base material 110 is polyethylene terephthalate, the glass transition temperature is high, the melting point is 250-255 ℃, and it is difficult to realize the adhesion between the base material 110 and the adhesive layer 120 by hot melting in a heating manner.

When the battery tab welding tape of the present utility model is used to adhere to the tab terminal weld, the tape can be attached to the tab terminal weld not only by the adhesive force of the adhesive layer 120. In addition, the substrate 110 can be heated to 120-200 ℃ by a heating strip or a heat source, and the substrate 110 is micro-melted and thermally adhered with the adhesive layer 120, so that the adhesive force of the adhesive tape is further improved. Therefore, in the subsequent processing and using process of the lithium ion battery, the adhesive tape for welding the battery tab is not easy to fall off spontaneously, and the metal dust particles remained on the tab can be prevented from falling into the electrode group or the battery core all the time. The adhesive tape is prevented from falling into the battery cells, so that the internal resistance of the battery cells is prevented from being increased sharply, and the consistency between the battery cells is good.

Specifically, in the exemplary embodiment, the material of the substrate 110 is polypropylene, which has been widely used for manufacturing the plastic-aluminum film of the housing of the soft battery cell. Specifically, the material of the base material 110 is any one of homo-polypropylene, block-copolymerized polypropylene and random-copolymerized polypropylene.

Specifically, in the exemplary embodiment, adhesive layer 120 is a layer of polyacrylic acid, which provides better adhesion.

Specifically, in the exemplary embodiment, as shown in FIGS. 1 and 2, the width W of substrate 110 is 5mm-46mm, and/or the width B of adhesive layer 120 is 5mm-40mm. The edge of the adhesive layer 120 is spaced apart from the edge of the corresponding side of the substrate 110 by a preset distance a of 0 to 3mm. The thickness L of the tape is 30 μm to 80 μm, and/or the thickness D of the substrate 110 is 20 μm to 60 μm, and/or the thickness C of the adhesive layer 120 is 10 μm to 20 μm. Therefore, the adhesive tape is ensured to have better adhesive force, so that the adhesive tape is not easy to fall off from the final welding and printing position of the tab.

Specifically, in the exemplary embodiment, the battery tab welding adhesive tape further includes a release film layer attached to a side of the adhesive layer 120 away from the substrate 110. The release film layer can form a protection for the adhesive layer 120. When the adhesive tape is needed, the release film layer is firstly removed.

Fig. 3 shows a welded connection structure of tab and tab/tab 300 when the battery tab welding tape is not used.

In a second aspect of the present application, there is also provided a welding structure, referring to fig. 4 and 5, which includes a tab 200 and the battery tab welding tape provided in any of the above embodiments. At least one side of the tab 200 is attached with a battery tab welding tape. Therefore, the metal dust particles remained on the lugs can be effectively prevented from falling into the pole group or the battery cell. Moreover, the adhesive tape is not easy to fall off spontaneously from the final welding and printing position.

Preferably, in the exemplary embodiment, battery tab welding tapes are respectively attached to opposite side surfaces of the tab 200. Therefore, the metal dust particles remained on the lugs are further prevented from falling into the pole group or the battery cell. And/or the welding structure further comprises a Tab/adapter 300, and the battery Tab welding adhesive tape is attached to the welding points of the Tab/adapter 300 and the pole piece Tab 200. The overlap width E of the tape and the strip on Tab/transfer sheet 300 is 0-1mm.

In a third aspect of the present application, there is further provided a battery, including the welding structure provided in any of the above embodiments of the battery tab welding tape provided in any of the above embodiments.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "examples," "particular examples," "one particular embodiment," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The present utility model is not limited to the above preferred embodiments, and any person skilled in the art, within the scope of the present utility model, may apply to the present utility model, and equivalents and modifications thereof are intended to be included in the scope of the present utility model.

Claims (10)

1. An adhesive tape for welding battery tabs, comprising:

a substrate;

the middle part of one side surface of the base material is coated with an adhesive layer;

the melting point of the substrate is 120-200 ℃.

2. The battery tab welding tape according to claim 1, wherein the base material is polypropylene.

3. The battery tab welding tape of claim 1, wherein the adhesive layer is a polyacrylic acid gel layer.

4. A battery tab welding tape according to any one of claims 1 to 3, wherein a predetermined distance is left between an edge of the adhesive layer and an edge of the corresponding side of the base material.

5. The battery tab welding adhesive tape according to any one of claims 1 to 3, wherein the thickness L of the adhesive tape is 30 μm to 80 μm;

and/or the thickness D of the substrate is 20 μm to 60 μm;

and/or the thickness C of the adhesive layer is 10 μm-20 μm.

6. The battery tab welding adhesive tape according to any one of claims 1 to 3, wherein the width W of the base material is 5mm to 46mm;

and/or the width B of the bonding layer is 5mm-40mm.

7. The battery tab welding tape according to any one of claims 1 to 3, further comprising a release film layer;

the release film layer is attached to one side surface, far away from the base material, of the bonding layer.

8. A welding structure characterized by comprising a pole piece tab and the battery tab welding tape of any one of claims 1 to 7;

and at least one side surface of the pole piece lug is attached with the adhesive tape for welding the battery lug.

9. The welding structure according to claim 8, wherein the battery tab welding tapes are attached to opposite side surfaces of the pole tab, respectively;

and/or the battery Tab welding adhesive tape is attached to the welding points of the Tab/the switching piece and the Tab.

10. A battery comprising the battery tab welding tape according to any one of claims 1 to 7 or the welding structure according to claim 8 or 9.

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