Pole piece insulation protection gummed paper and secondary battery

Abstract

The utility model provides pole piece insulation protection gummed paper and a secondary battery, the pole piece insulation protection gummed paper comprises a first structural layer and a second structural layer, the first structural layer comprises a first hardness enhancement supporting layer and a first bonding layer which are stacked in sequence; the second structural layer comprises a second hardness enhancing supporting layer and a second bonding layer which are stacked in sequence, the second hardness enhancing supporting layer adheres to the side, away from the first hardness enhancing supporting layer, of the first bonding layer, and the second bonding layer adheres to the side, away from the first bonding layer, of the second hardness enhancing supporting layer. The first hardness enhancing supporting layer and the second hardness enhancing supporting layer form two insulating protection layers, so that the protection effect and the insulating effect of the pole piece insulating protection gummed paper on the pole piece are improved; the first hardness enhancing supporting layer and the second hardness enhancing supporting layer form two hardness supporting layers, so that the hardness of the pole piece insulation protection gummed paper is high, and the phenomenon that the pole piece insulation protection gummed paper is wrinkled in the pole piece adhesion process is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesive tape, and in particular to an electrode insulating protective adhesive tape and a secondary battery. Background Art

[0002] As technology advances, people's requirements for the performance of electronic products are gradually increasing. The increase in the performance of electronic products is actually an increase in the performance of batteries; using various thinner materials is to increase the energy density of batteries.

[0003] However, when the thickness of the material used is too thin, the strength of the material will decrease, which will bring difficulties to the battery production process. For example, as the thickness of the protective tape on the battery electrode decreases, when the hardness of the tape is not enough, the tape becomes soft, which makes the requirements for the adhesive laminating equipment higher, resulting in the tape being easily wrinkled during the process of sticking the electrode.

[0004] For example, the adhesive tape, battery cell and battery disclosed in the comparative document CN201721899240.5, the adhesive tape includes a substrate layer, a heat-conducting medium layer and a first adhesive layer, the heat-conducting medium layer is located between the substrate layer and the first adhesive layer, and the thermal conductivity of the heat-conducting medium layer is greater than that of the substrate layer and the first adhesive layer. The above solution solves the problem that the thermal conductivity of the adhesive tape is good, which improves the heat transfer efficiency between the baffle and the battery cell body. However, this solution fails to solve the problem that when the substrate layer is thin, the adhesive tape becomes soft, which causes the adhesive tape to easily wrinkle and other undesirable phenomena during the process of adhering to the pole piece. Utility Model Content

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a pole piece insulating protective tape and a secondary battery with high hardness to prevent the tape from wrinkling.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] A pole piece insulating protective tape, comprising a first structural layer and a second structural layer, wherein the first structural layer comprises a first hardness enhancing support layer and a first adhesive layer, the first adhesive layer and the first hardness enhancing support layer are stacked in sequence, and the first hardness enhancing support layer is used to increase the hardness of the tape;

[0008] The second structural layer includes a second hardness enhancing support layer and a second adhesive layer. The second hardness enhancing support layer and the second adhesive layer are stacked in sequence. The second hardness enhancing support layer is adhered to the side of the first adhesive layer facing away from the first hardness enhancing support layer. The second adhesive layer is located on the side of the second hardness enhancing support layer facing away from the first adhesive layer. The second hardness enhancing support layer is used to increase the hardness of the adhesive tape.

[0009] In one embodiment, the first adhesive layer includes a first connecting portion, a supporting portion, and a second connecting portion. The supporting portion is disposed between the first connecting portion and the second connecting portion. The first connecting portion is used for adhering to the electrode tab, and the second connecting portion is used for adhering to the electrode tab.

[0010] In one embodiment, the first connecting portion, the supporting portion, and the second connecting portion extend parallel to each other.

[0011] In one embodiment, the width of the first hardness-enhanced supporting layer is the same as the width of the first adhesive layer, and the width of the second hardness-enhanced supporting layer is the same as the width of the second adhesive layer.

[0012] In one embodiment, the thickness of the first hardness-enhanced supporting layer is 2 μm to 20 μm.

[0013] In one embodiment, the thickness of the second hardness-enhanced supporting layer is 6 μm - 10 μm.

[0014] In one embodiment, the thickness of the first adhesive layer is 2 μm to 4 μm.

[0015] In one embodiment, the thickness of the second adhesive layer is 2 μm to 6 μm.

[0016] In one embodiment, a receiving groove is further formed on one side of the second adhesive layer facing away from the second hardness-enhanced supporting layer.

[0017] A secondary battery includes the electrode tab insulating protective adhesive tape described in any one of the above embodiments.

[0018] Compared with the prior art, the present disclosure has at least the following advantages:

[0019] For the above-mentioned electrode tab insulating protective adhesive tape and secondary battery, by laminating the first hardness-enhanced supporting layer, the second hardness-enhanced supporting layer, and the second adhesive layer in sequence, two insulating protective layers are formed by the first hardness-enhanced supporting layer and the second hardness-enhanced supporting layer in the electrode tab insulating protective adhesive tape, thereby improving the protection and insulation effects of the electrode tab insulating protective adhesive tape on the electrode tab; the first hardness-enhanced supporting layer and the second hardness-enhanced supporting layer form two hardness supporting layers, making the electrode tab insulating protective adhesive tape harder, thus reducing the phenomenon of wrinkling during the process of adhering the electrode tab insulating protective adhesive tape to the electrode tab, and further improving the efficiency of adhering the electrode tab insulating protective adhesive tape to the electrode tab. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present disclosure and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0021] Figure 1 Schematic diagram of the structure of the pole piece insulating protective adhesive tape for an embodiment;

[0022] Figure 2 For Figure 1 Another schematic diagram of the pole piece insulating protective adhesive tape shown;

[0023] Figure 3 Schematic diagram of the structure of a secondary battery for an embodiment;

[0024] Figure 4 For Figure 3 Enlarged partial structure diagram of the secondary battery shown at A. Detailed implementation manners

[0025] To facilitate the understanding of the present disclosure, the following will describe the present disclosure more comprehensively with reference to the relevant drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure content of the present disclosure understood more thoroughly and comprehensively.

[0026] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present disclosure belongs. The terms used in the specification of the present disclosure herein are only for the purpose of describing specific implementation manners and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0028] To better understand the technical solutions and beneficial effects of the present disclosure, the following further details the present disclosure with specific embodiments:

[0029] Such as Figures 1 to 4As shown in the figure, it is the pole piece insulating protective adhesive tape 10 of an embodiment of the present disclosure, which includes a first structural layer 100 and a second structural layer 200. The first structural layer 100 includes a first hardness-enhanced support layer 110 and a first adhesive layer 120. The first adhesive layer 120 and the first hardness-enhanced support layer 110 are stacked in sequence, and the first hardness-enhanced support layer is used to increase the hardness of the adhesive tape.

[0030] Further, the second structural layer 200 includes a second hardness-enhanced support layer 210 and a second adhesive layer 220. The second hardness-enhanced support layer 210 and the second adhesive layer 220 are stacked in sequence. The second hardness-enhanced support layer 210 adheres to the side of the support portion 122 away from the first hardness-enhanced support layer 110, and the second adhesive layer 220 is located on the side of the second hardness-enhanced support layer 210 away from the support portion 122. The second hardness-enhanced support layer is used to increase the hardness of the adhesive tape.

[0031] In this embodiment, when the pole piece insulating protective adhesive tape 10 adheres to the pole piece, the first hardness-enhanced support layer 110, the first adhesive layer 120, the second hardness-enhanced support layer 210, and the second adhesive layer 220 are stacked in sequence on the pole piece. The first hardness-enhanced support layer 110 and the second hardness-enhanced support layer have good insulation performance. The first hardness-enhanced support layer 110 and the second hardness-enhanced support layer 210 form two insulating protective layers in sequence; the first hardness-enhanced support layer 110 and the second hardness-enhanced support layer 210 form two hardness support layers, which increases the hardness of the pole piece insulating protective adhesive tape 10, so that the pole piece insulating protective adhesive tape 10 is not easily deformed and wrinkled.

[0032] For the above-mentioned pole piece insulating protective adhesive tape 10, by stacking the first hardness-enhanced support layer 110, the second hardness-enhanced support layer 210, and the second adhesive layer 220 in sequence, the first hardness-enhanced support layer 110 and the second hardness-enhanced support layer 210 form two insulating protective layers in the pole piece insulating protective adhesive tape 10, thereby improving the protection effect and insulation effect of the pole piece insulating protective adhesive tape 10 on the pole piece; the first hardness-enhanced support layer 110 and the second hardness-enhanced support layer 210 form two hardness support layers, making the pole piece insulating protective adhesive tape 10 harder, thereby reducing the phenomenon of wrinkling during the process of the pole piece insulating protective adhesive tape 10 adhering to the pole piece, and further improving the efficiency of the pole piece insulating protective adhesive tape adhering to the pole piece.

[0033] Such as Figure 1As shown, in one embodiment, the width of the first hardness-enhanced support layer 110 is the same as the width of the first adhesive layer 120, and the width of the second hardness-enhanced support layer 210 is the same as the width of the second adhesive layer 220. In this embodiment, the first adhesive layer 120 adheres to the first hardness-enhanced support layer 110. By making the first hardness-enhanced support layer 110 completely fit the first adhesive layer 120, the problem of the first hardness-enhanced support layer 110 warping is prevented. The second adhesive layer 220 adheres to the second hardness-enhanced support layer 210. By making the second hardness-enhanced support layer 210 completely fit the second adhesive layer 220, the problem of the second hardness-enhanced support layer 210 warping is prevented. Thus, the first hardness-enhanced support layer 110, the first adhesive layer 120, the second hardness-enhanced support layer 210, and the second adhesive layer 220 are stacked in sequence to form the tightly integrated pole piece insulating protective adhesive tape 10.

[0034] As Figure 1 and Figure 4 shown, in one embodiment, the first adhesive layer 120 includes a first connecting portion 121, a support portion 122, and a second connecting portion 123. The support portion 222 is disposed between the first connecting portion 121 and the second connecting portion 123. The second hardness-enhanced support layer 210 adheres to the side of the support portion 122 facing away from the first hardness-enhanced support layer 110. In this embodiment, the first connecting portion 121 is used to adhere to the pole piece, and the second connecting portion 123 is used to adhere to the pole piece. The pole piece insulating protective adhesive tape 10 forms avoidance areas above the first adhesive layer 120 and the second connecting portion 123 respectively. When the pole piece insulating protective adhesive tape 10 adheres to the connection between the pole piece and the pole ear, the coating positions on both sides of the connection of the pole piece are thicker, and the avoidance areas of the thinner parts of the pole piece insulating protective adhesive tape 10 accommodate the thicker sides of the pole piece coating, so that the second hardness-enhanced support layer 210 and the second adhesive layer 220 of the thicker part of the pole piece insulating protective adhesive tape 10 are located on the thinner side of the pole piece without coating, thereby reducing the total thickness of the pole piece and the pole piece insulating protective adhesive tape 10, and further improving the energy density of the battery.

[0035] As Figure 1 shown, in one embodiment, the first connecting portion 121, the support portion 122, and the second connecting portion 123 extend parallel to each other. In this embodiment, the first connecting portion 121, the support portion 122, and the second connecting portion 123 extend parallel to each other, so that the structures between the first hardness-enhanced support layer 110, the first adhesive layer 120, the second hardness-enhanced support layer 210, and the second adhesive layer 220 of the pole piece insulating protective adhesive tape 10 along the extension direction are the same, thereby enabling the cut pole piece insulating protective adhesive tape 10 to be applied to the mass production of batteries.

[0036] In one embodiment, the thickness of the second hardness-enhancing support layer 210 is 6 μm - 10 μm. In this embodiment, when the first hardness-enhancing support layer 110 is relatively thin, the thickness of the second hardness-enhancing support layer 210 affects the hardness of the second hardness-enhancing support layer 210. The second hardness-enhancing support layer 210 is used to increase the hardness of the pole piece insulating protective adhesive tape 10. The thickness of the second hardness-enhancing support layer 210 is 6 μm - 10 μm. The thickness of the second hardness-enhancing support layer 210 is greater than 6 μm, preventing the second hardness-enhancing support layer 210 from being too soft, thus avoiding the problem of the pole piece insulating protective adhesive tape 10 wrinkling. The thickness of the second hardness-enhancing support layer 210 is less than 10 μm, making the thickness of the pole piece insulating protective adhesive tape 10 relatively thin, thereby improving the energy density of the battery.

[0037] In one embodiment, the thickness of the first adhesive layer 120 is 2 μm - 4 μm. In this embodiment, the first adhesive layer 120 is mainly used to bond the first hardness-enhancing support layer 110, the second hardness-enhancing support layer 210 and the surface of the product. The thickness of the first adhesive layer 120 is 2 μm - 4 μm, so that the first adhesive layer 120 is relatively thin, thereby reducing the influence of the first adhesive layer 120 on the hardness and thickness of the pole piece insulating protective adhesive tape 10.

[0038] In one embodiment, the thickness of the second adhesive layer 220 is 2 μm - 6 μm. In this embodiment, the second adhesive layer 220 can be used to adhere to the connection between the pole piece and the pole ear. When the position where the second adhesive layer 220 adheres is relatively low, the thickness of the second adhesive layer 220 is 2 μm - 6 μm. By selecting the appropriate thickness of the second adhesive layer 220, the second adhesive layer 220 fits the connection between the pole piece and the pole ear, so that the pole piece insulating protective adhesive tape 10 adheres to the surface of the pole piece smoothly.

[0039] As Figure 2 shown, in one embodiment, a receiving groove 2201 is further formed on one side of the second adhesive layer 220 facing away from the second hardness-enhancing support layer 210. In this embodiment, when the pole piece insulating protective adhesive tape 10 is cut and adhered to the connection between the pole piece and the pole ear, one end of the pole ear facing away from the pole piece is embedded in the receiving groove 2201, so that the position of the second adhesive layer 220 is lowered, thereby reducing the thickness of the first hardness-enhancing support layer 110, the first adhesive layer 120, the second hardness-enhancing support layer 210 and the second adhesive layer 220 on the pole piece, and thus improving the energy density of the battery.

[0040] As Figure 3 and Figure 4As shown, the present application also provides a secondary battery, including the electrode insulating protective adhesive tape 10 described in any of the above embodiments. In this embodiment, by sequentially laminating the first hardness enhancement support layer 110, the second hardness enhancement support layer 210, and the second adhesive layer 220, the electrode insulating protective adhesive tape 10 has a relatively high hardness, so that it is convenient for the electrode insulating protective adhesive tape 10 to adhere to the electrode, and the phenomenon of the electrode insulating protective adhesive tape 10 wrinkling is reduced.

[0041] Compared with the prior art, the present disclosure has at least the following advantages:

[0042] For the above-mentioned electrode insulating protective adhesive tape 10 and secondary battery, by sequentially laminating the first hardness enhancement support layer 110, the second hardness enhancement support layer 210, and the second adhesive layer 220, two insulating protective layers are formed in the electrode insulating protective adhesive tape 10 by the first hardness enhancement support layer 110 and the second hardness enhancement support layer 210, thereby improving the protection effect and insulating effect of the electrode insulating protective adhesive tape 10 on the electrode; the first hardness enhancement support layer 110 and the second hardness enhancement support layer 210 form two hardness support layers, making the electrode insulating protective adhesive tape 10 relatively hard, thus reducing the phenomenon of the electrode insulating protective adhesive tape 10 wrinkling during the process of adhering to the electrode, and further improving the efficiency of the electrode insulating protective adhesive tape 10 adhering to the electrode.

[0043] The above embodiments only represent several implementation manners of the present disclosure, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the disclosed patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several modifications and improvements can still be made, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent shall be subject to the appended claims.

Claims

1. A pole piece insulating protective tape, characterized in that: The adhesive tape comprises a first structural layer and a second structural layer, wherein the first structural layer comprises a first hardness enhancing support layer and a first adhesive layer, the first adhesive layer and the first hardness enhancing support layer are stacked in sequence, and the first hardness enhancing support layer is used to enhance the hardness of the adhesive tape; The second structural layer includes a second hardness enhancing support layer and a second adhesive layer. The second hardness enhancing support layer and the second adhesive layer are stacked in sequence. The second hardness enhancing support layer is adhered to the side of the first adhesive layer facing away from the first hardness enhancing support layer. The second adhesive layer is adhered to the side of the second hardness enhancing support layer facing away from the first adhesive layer. The second hardness enhancing support layer is used to enhance the hardness of the adhesive tape.

2. The electrode insulating protective tape according to claim 1, characterized in that: The width of the first hardness enhancing support layer is the same as the width of the first adhesive layer, and the width of the second hardness enhancing support layer is the same as the width of the second adhesive layer.

3. The electrode insulating protective tape according to claim 1, characterized in that: The first adhesive layer includes a first connecting portion, a supporting portion and a second connecting portion, the supporting portion is disposed between the first connecting portion and the second connecting portion, and the second hardness enhancing supporting layer is adhered to a side of the supporting portion away from the first hardness enhancing supporting layer.

4. The electrode insulating protective tape according to claim 3, characterized in that: The first connection portion, the support portion and the second connection portion extend parallel to each other.

5. The electrode insulating protective tape according to claim 1, characterized in that: The thickness of the first hardness enhancing support layer is 2 μm to 20 μm.

6. The electrode insulating protective tape according to claim 1, characterized in that: The thickness of the second hardness enhancing support layer is 6 μm-10 μm.

7. The electrode insulating protective tape according to claim 1, characterized in that: The thickness of the first adhesive layer is 2 μm to 4 μm.

8. The electrode insulating protective tape according to claim 1, characterized in that: The second adhesive layer has a thickness of 2 μm to 6 μm.

9. The electrode insulating protective tape according to claim 1, characterized in that: A receiving groove is also formed on a side of the second adhesive layer away from the second hardness enhancing support layer.

10. A secondary battery, characterized in that: The invention comprises the electrode insulating protective tape as claimed in any one of claims 1 to 9.

Images