Tab protection glue without adapter plate design as well as preparation method and application of tab protection glue

Abstract

The invention belongs to the technical field of adhesives, and particularly relates to a tab protection adhesive without adapter plate design as well as a preparation method, a protection method and application of the tab protection adhesive. The tab protection glue contains polyolefin resin, tackifying resin, anhydride modified wax and modified polybutadiene resin in a mass ratio of 100: (15-400): (5-200): (5-200), and the modified polybutadiene resin is selected from at least one of hydroxyl modified polybutadiene resin, silane modified polybutadiene resin and anhydride modified polybutadiene resin. The tab protection glue provided by the invention has excellent electrolyte resistance, and can meet the use requirement of being exposed in electrolyte for a long time.

Description

Technical Field

[0001] The invention belongs to the field of adhesives, and in particular relates to a tab protection adhesive without a transfer sheet design, and a preparation method and application thereof. Background Art

[0002] Technological innovation is the lifeline that determines the survival of an enterprise and the core driving force for the high-quality development of the lithium battery industry. The adapter-free tab welding technology is a process optimization of the traditional "tab ultrasonic pre-welding-tab and connecting piece ultrasonic final welding-connecting piece and cover plate laser welding". The adapter structure is removed in the middle to reduce the process flow, and the tab ultrasonic pre-welding to multi-layer tab and cover plate laser welding is realized, which effectively improves the internal space utilization and current capacity of the battery cell, and enables the battery's high energy ratio, ultra-fast charging, safety and other performance innovations, while lowering the cost and improving the stability. However, since the temperature of laser welding is very high and it is easy to melt the metal, the molten metal welding slag will enter the battery cell, causing a direct short circuit between the positive and negative poles of the battery, resulting in rapid heating and fire or explosion.

[0003] In order to prevent metal welding slag from entering the battery cell, the main method at present is to stick tape on the surface of the adapter to prevent the welding slag from falling into the battery cell. However, since the ultrasonic welding and laser welding areas are not flat, the tape cannot be 100% attached to the weld mark, and during the operation of the battery, the temperature is generally above 40°C. At this time, the electrolyte will slowly penetrate into the glue layer of the tape, but most of the tapes currently used are not resistant to electrolyte. Therefore, during the long-term erosion of the electrolyte, the tape will gradually detach from the adapter, making the use of tape to protect the adapter welding slag ineffective. In view of this, it is urgent to develop a tab protection glue with excellent electrolyte resistance. Summary of the invention

[0004] The first purpose of the present invention is to solve the problem that the existing tab protection glue is not resistant to electrolyte, and to provide a tab protection glue with good electrolyte resistance and no adapter sheet design.

[0005] The second object of the present invention is to provide a method for preparing the tab protection adhesive without the adapter sheet design.

[0006] The third object of the present invention is to provide the application of the tab protection glue of the above-mentioned adapter design in a battery.

[0007] Specifically, the ear protection glue provided by the present invention contains a polyolefin resin, a tackifying resin, an anhydride-modified wax and a modified polybutadiene resin in a mass ratio of 100:(15-400):(5-200):(5-200), wherein the modified polybutadiene resin is selected from at least one of a hydroxyl-modified polybutadiene resin, a silane-modified polybutadiene resin and an anhydride-modified polybutadiene resin.

[0008] The preparation method of the tab protection glue of the adapter plate provided by the present invention comprises the steps of melt-mixing polyolefin resin, tackifying resin, anhydride-modified wax and modified polybutadiene resin to obtain the tab protection glue of the adapter plate.

[0009] The key to the present invention is to use polyolefin resin, tackifying resin, anhydride-modified wax and modified polybutadiene resin (at least one of hydroxy-modified polybutadiene resin, silane-modified polybutadiene resin and anhydride-modified polybutadiene resin) in combination, and the obtained ear protection glue has excellent electrolyte resistance and can meet the use requirements of long-term exposure to electrolyte. It is speculated that the reason may be due to: on the one hand, the stable molecular structure, low solubility and good electrochemical stability of polyolefin resin give it good electrolyte resistance; on the other hand, due to the anhydride-modified wax and hydroxy-modified polybutadiene resin, silane-modified polybutadiene resin and anhydride-modified polybutadiene resin and metal substrates (such as copper, aluminum, etc.) can form abundant hydrogen bonds, these hydrogen bonds can make the glue layer closely fit to the surface of the substrate to form a dense glue layer, so that it is not easy to be destroyed in an environment corroded by the electrolyte. That is, the present invention synergistically improves the electrolyte resistance of the ear protection glue from multiple dimensions.

[0010] In a preferred embodiment, when the hydroxyl value in the hydroxyl-modified polybutadiene resin is controlled at 40-55 mgKOH / g and / or the content of silane groups in the silane-modified polybutadiene resin is controlled at 2-20 wt% and / or the content of anhydride groups in the anhydride-modified polybutadiene resin is controlled at 10-20 wt%, the tab protective glue can be endowed with better electrolyte resistance. DETAILED DESCRIPTION

[0011] The tab protection glue without adapter sheet provided by the present invention contains polyolefin resin, tackifying resin, anhydride modified wax and modified polybutadiene resin in a mass ratio of 100:(15-400):(5-200):(5-200). The mass ratio of the polyolefin resin to the tackifying resin is 100:(15-400), such as 100:15, 100:20, 100:50, 100:80, 100:100, 100:150, 100:200, 100:250, 100:300, 100:350, 100:400 or any value therebetween; the mass ratio of the polyolefin resin to the anhydride modified wax is 100:(5-200), such as 100:5, 100:10 , 100:20, 100:50, 100:100, 100:150, 100:200 or any value therebetween; the mass ratio of the polyolefin resin to the modified polybutadiene resin is 100:(5-200), such as 100:5, 100:10, 100:20, 100:30, 100:40, 100:50, 100:60, 100:80, 100:100, 100:150, 100:200 or any value therebetween.

[0012] In the present invention, the content of the polyolefin resin is preferably 10 to 60 parts by weight, such as 10, 15, 20, 22, 25, 28, 30, 32, 35, 38, 40, 42, 45, 48, 50, 52, 55, 58, 60 parts by weight or any value therebetween; the content of the tackifying resin is preferably 10 to 40 parts by weight, such as 10, 12, 15, 18, 20, 25, 30, 35, 40 parts by weight or any value therebetween; the content of the anhydride modified wax is preferably 5 to 20 parts by weight, such as 5, 8, 10, 12, 15, 18, 20 parts by weight or any value therebetween; the content of the modified polybutadiene resin is preferably 3 to 20 parts by weight, such as 3, 5, 8, 10, 12, 15, 18, 20 parts by weight or any value therebetween.

[0013] In the present invention, the type and quantity of the polyolefin resin are not particularly limited, and it can be at least one of the homopolymers and copolymers of α-olefins and cycloolefins. Among them, the α-olefin can be listed as at least one of ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene and 4-methyl-1-pentene. The cycloolefin can be listed as at least one of cyclobutene, cyclopentene and cyclohexene. The polyolefin resin is preferably a compound of two resins with different number average molecular weights, different softening points and different viscosities, which can not only improve the overall fluidity, but also provide sufficient bonding strength and better electrolyte corrosion resistance for the hot melt adhesive. Specifically, the number average molecular weight of the polyolefin resin is preferably 6000 to 20000 g / mol, such as 6000 g / mol, 7000 g / mol, 8000 g / mol, 9000 g / mol, 10000 g / mol, 15000 g / mol, 20000 g / mol or any value therebetween. The softening point of the polyolefin resin is preferably 70°C to 170°C, such as 70°C, 100°C, 120°C, 150°C, 170°C or any value therebetween.

[0014] In the present invention, the tackifying resin is conducive to making the hot melt adhesive have suitable viscosity and fluidity, reducing the difficulty of operation when using the hot melt adhesive, and improving the bonding ability of the hot melt adhesive. Specifically, specific examples of the tackifying resin include, but are not limited to: at least one of C5 petroleum resin, C9 petroleum resin, dicyclopentadiene DCPD resin, coumarone-indene resin, styrene series resin, condensation resin, hydrocarbon petroleum resin and hydrogenated petroleum resin. In addition, the softening point of the tackifying resin is preferably 80°C to 140°C, such as 80°C, 100°C, 120°C, 130°C, 140°C or any value therebetween.

[0015] In the present invention, the anhydride-modified wax can be anhydride-modified polyethylene wax, anhydride-modified polypropylene wax, or a mixture of the two. In addition, the content of anhydride groups in the anhydride-modified wax is preferably 1wt% or more, more preferably 1-10wt%, which can give the ear protection glue better electrolyte resistance. The content of anhydride groups in the anhydride-modified wax can be, for example, 1wt%, 2wt%, 4wt%, 6wt%, 8wt%, 10wt% or any value therebetween.

[0016] In the present invention, the number average molecular weight of the modified polybutadiene resin is preferably 1000-5000 g / mol, such as 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000 g / mol or any value therebetween. In addition, the hydroxyl value of the hydroxy-modified polybutadiene resin is preferably 40-55 mgKOH / g, such as 40, 42, 44, 46, 48, 50, 52, 55 KOH / g or any value therebetween. The content of silane groups in the silane-modified polybutadiene resin is preferably 2-20 wt%, such as 2 wt%, 4 wt%, 6 wt%, 8 wt%, 10 wt%, 12 wt%, 14 wt%, 16 wt%, 18 wt%, 20 wt% or any value therebetween. The content of the anhydride group in the anhydride-modified polybutadiene resin is preferably 10 to 20 wt%, such as 10 wt%, 12 wt%, 14 wt%, 16 wt%, 18 wt%, 20 wt% or any value therebetween. When the hydroxyl value in the hydroxy-modified polybutadiene resin, the content of the silane group in the silane-modified polybutadiene resin and the content of the anhydride group in the anhydride-modified polybutadiene resin are controlled within the above preferred ranges, the tab protective glue can be endowed with better electrolyte resistance.

[0017] The preparation method of the tab protection glue without the adapter sheet design provided by the present invention comprises the steps of melt-mixing polyolefin resin, tackifying resin, anhydride-modified wax and modified polybutadiene to obtain the tab protection glue without the adapter sheet design.

[0018] In the present invention, the conditions for melt mixing preferably include a temperature of 110 to 190°C, such as 110°C, 120°C, 150°C, 180°C, 190°C or any value therebetween; a stirring speed of 100 to 500rpm, such as 100rpm, 150rpm, 200rpm, 250rpm, 300rpm, 350rpm, 400rpm, 450rpm, 500rpm or any value therebetween; a vacuum degree of less than -0.01MPa, such as -0.01MPa, -0.008MPa, -0.005MPa, -0.003MPa, -0.001MPa or any value therebetween; and a time of 1 to 5h, such as 1h, 2h, 3h, 4h, 5h or any value therebetween.

[0019] In addition, the present invention also provides the application of the tab protection glue without adapter design in a battery. The type of the battery is not particularly limited, and can be a lithium ion battery or a lithium metal battery.

[0020] The present invention will be described in detail below through specific embodiments.

[0021] The raw material parts involved in the following examples and comparative examples are all parts by weight.

[0022] Example 1 Tab protection adhesive without adapter design and preparation method thereof

[0023] Weigh 40 parts of polyolefin resin (VESTOPLAST EP V2103 from Evonik), 12 parts of polyolefin resin (VESTOPLAST 704 from Evonik), 30 parts of tackifying resin (Escorez TM 5340), 15 parts of anhydride-modified polypropylene wax (Licocene pp MA 6252 from Klein, with anhydride group content of 7 wt%) and 3 parts of hydroxyl-modified polybutadiene (number average molecular weight of 2900 g / mol, hydroxyl value of 45 mgKOH / g) are placed in a reactor, melt mixed at a temperature of 170°C, the vacuum degree is controlled at -0.01 MPa, the stirring speed is set at 300 rpm, and the material is discharged after stirring for 2.5 hours to obtain a tab protection glue without a transfer sheet design.

[0024] Example 2 Tab protection adhesive without adapter design and preparation method thereof

[0025] Weigh 25 parts of polyolefin resin (VESTOPLAST EP V2103 from Evonik), 25 parts of polyolefin resin (VESTOPLAST EP V2904 from Evonik), 35 parts of tackifying resin (Escorez TM 5320), 10 parts of anhydride modified polypropylene wax (Licocene pp MA 6452 from Klein, the anhydride group content is 7wt%) and 5 parts of silane modified polybutadiene (number average molecular weight is 3200g / mol, the silane group content is 2wt%) are placed in a reactor, melt mixed at a temperature of 110°C, the vacuum degree is controlled at -0.01MPa, the stirring speed is set to 500rpm, and the material is discharged after stirring for 5h to obtain the ear protection glue without adapter design.

[0026] Example 3: Tab protection adhesive without adapter design and preparation method thereof

[0027] Weigh 12 parts of polyolefin resin (VESTOPLAST EP V2904 from Evonik), 40 parts of polyolefin resin (VESTOPLAST 703 from Evonik), 30 parts of tackifying resin (Escorez TM5300), 15 parts of anhydride-modified polypropylene wax (Licocene pp MA 6252 from Klein, with anhydride group content of 7wt%) and 3 parts of anhydride-modified polybutadiene (number average molecular weight of 3200g / mol, anhydride group content of 12wt%) are placed in a reaction kettle, melt mixed at a temperature of 190°C, the vacuum degree is controlled at -0.01MPa, the stirring speed is set to 300rpm, and the material is discharged after stirring for 1h to obtain the ear protection glue without adapter design.

[0028] Example 4 Tab protection adhesive without adapter design and preparation method thereof

[0029] Weigh 30 parts of polyolefin resin (VESTOPLAST EP V2103 from Evonik), 25 parts of polyolefin resin (VESTOPLAST 703 from Evonik), 25 parts of tackifying resin (Escorez TM 5340), 15 parts of anhydride modified polypropylene wax (Licocene pp MA 6452 from Klein, with anhydride group content of 7wt%) and 5 parts of hydroxyl modified polybutadiene (number average molecular weight of 2900, hydroxyl value of 45mgKOH / g) are placed in a reactor, melt mixed at a temperature of 170°C, the vacuum degree is controlled at -0.01MPa, the stirring speed is set at 300rpm, and the material is discharged after stirring for 2.5h to obtain the ear protection glue without adapter design.

[0030] Example 5 Tab protection adhesive without adapter design and preparation method thereof

[0031] Weigh 40 parts of polyolefin resin (VESTOPLAST EP V2904 from Evonik), 15 parts of polyolefin resin (VESTOPLAST 704 from Evonik), 25 parts of tackifying resin (Escorez TM 5320), 12 parts of anhydride modified polypropylene wax (Licocene pp MA 6252 from Klein, the anhydride group content is 7wt%) and 8 parts of silane modified polybutadiene (number average molecular weight is 3200, the silane group content is 2wt%) are placed in a reaction kettle, melt mixed at a temperature of 170°C, the vacuum degree is controlled at -0.01MPa, the stirring speed is set to 300rpm, and the material is discharged after stirring for 2.5h to obtain the ear protection glue without adapter design.

[0032] Example 6 Tab protection adhesive without adapter design and preparation method thereof

[0033] Weigh 27 parts of polyolefin resin (VESTOPLAST EP V2103 from Evonik), 30 parts of polyolefin resin (VESTOPLAST 703 from Evonik), 25 parts of tackifying resin (EscorezTM 5300), 15 parts of anhydride-modified polypropylene wax (Licocene pp MA 6452 from Klein, with anhydride group content of 7wt%) and 3 parts of anhydride-modified polybutadiene (number average molecular weight of 3200, anhydride group content of 12wt%) are placed in a reaction kettle, melt mixed at a temperature of 170°C, the vacuum degree is controlled at -0.01MPa, the stirring speed is set at 300rpm, and the material is discharged after stirring for 2.5h to obtain the ear protection glue without adapter design.

[0034] Example 7 Tab protection adhesive without adapter design and preparation method thereof

[0035] Weigh 40 parts of polyolefin resin (VESTOPLAST EP V2103 from Evonik), 10 parts of polyolefin resin (VESTOPLAST 703 from Evonik), 30 parts of tackifier resin (Escorez TM 5340), 10 parts of anhydride modified polypropylene wax (Licocene pp MA 6252 from Klein, with anhydride group content of 7 wt%) and 10 parts of hydroxyl modified polybutadiene (number average molecular weight of 2900, hydroxyl value of 45 mgKOH / g) are placed in a reactor, melt mixed at a temperature of 170°C, the vacuum degree is controlled at -0.01 MPa, the stirring speed is set at 300 rpm, and the material is discharged after stirring for 2.5 hours to obtain the ear protection glue without adapter design.

[0036] Example 8 Tab protection adhesive without adapter design and preparation method thereof

[0037] Weigh 30 parts of polyolefin resin (VESTOPLAST EP V2103 from Evonik), 27 parts of polyolefin resin (VESTOPLAST EP V2904 from Evonik), 20 parts of tackifier resin (Escorez TM 5320), 15 parts of anhydride modified polypropylene wax (Licocene pp MA 6452 from Klein, the anhydride group content is 7wt%) and 8 parts of silane modified polybutadiene (number average molecular weight is 3200, the silane group content is 2wt%) are placed in a reaction kettle, melt mixed at a temperature of 170°C, the vacuum degree is controlled at -0.01MPa, the stirring speed is set to 300rpm, and the material is discharged after stirring for 2.5h to obtain the ear protection glue without adapter design.

[0038] Example 9: Tab protection adhesive without adapter design and preparation method thereof

[0039] Weigh 30 parts of polyolefin resin (VESTOPLASTEP V2904 from Evonik), 30 parts of polyolefin resin (VESTOPLAST 703 from Evonik), 20 parts of tackifying resin (EscorezTM 5300), 10 parts of anhydride-modified polypropylene wax (Licocene pp MA 6252 from Klein, with anhydride group content of 7wt%) and 10 parts of anhydride-modified polybutadiene (number average molecular weight of 3200, anhydride group content of 12wt%) are placed in a reaction kettle, melt mixed at a temperature of 170°C, the vacuum degree is controlled at -0.01MPa, the stirring speed is set at 300rpm, and the material is discharged after stirring for 2.5h to obtain a tab protection glue without a transfer sheet design.

[0040] Example 10 Tab protection adhesive without adapter design and preparation method thereof

[0041] Weigh 10 parts of polyolefin resin (VESTOPLAST EP V2103 from Evonik), 25 parts of polyolefin resin (VESTOPLAST 703 from Evonik), 20 parts of polyolefin resin (VESTOPLAST 704 from Evonik), 35 parts of tackifier resin (Escorez TM 5340), 12 parts of anhydride modified polypropylene wax (Licocene pp MA 6452 from Klein, with anhydride group content of 7wt%) and 8 parts of hydroxyl modified polybutadiene (number average molecular weight of 2900, hydroxyl value of 45mgKOH / g) are placed in a reactor, melt mixed at a temperature of 170°C, the vacuum degree is controlled at -0.01MPa, the stirring speed is set at 300rpm, and the material is discharged after stirring for 2.5h to obtain the ear protection glue without adapter design.

[0042] Example 11 Tab protection adhesive without adapter design and preparation method thereof

[0043] The lug protection glue was prepared according to the method of Example 1, except that the hydroxy-modified polybutadiene was replaced by the same weight portion of non-preferred hydroxy-modified polybutadiene resin (number average molecular weight of 2500, hydroxyl value of 36 mgKOH / g), and the other conditions were the same as in Example 1 to obtain a lug protection glue without an adapter design.

[0044] Example 12 Tab protection adhesive without adapter design and preparation method thereof

[0045] The lug protection glue was prepared according to the method of Example 2, except that the silane-modified polybutadiene was replaced by an equal weight portion of a non-preferred silane-modified polybutadiene resin (number average molecular weight of 3000, silane group content of 1 wt%), and the remaining conditions were the same as those of Example 2 to obtain a lug protection glue without an adapter design.

[0046] Example 13: Tab protection adhesive without adapter design and preparation method thereof

[0047] The lug protection glue was prepared according to the method of Example 3, except that the anhydride-modified polybutadiene was replaced by the same weight portion of non-preferred anhydride-modified polybutadiene resin (number average molecular weight of 3000, anhydride group content of 7.5wt%), and the other conditions were the same as in Example 3 to obtain a lug protection glue without an adapter design.

[0048] Example 14: Tab protection adhesive without adapter design and preparation method thereof

[0049] The lug protection glue was prepared according to the method of Example 3, except that the polyolefin resin (VESTOPLAST EP V2904 of Evonik) was replaced by the same weight portion of polyolefin resin (VESTOPLAST 703 of Evonik), and the other conditions were the same as those of Example 3 to obtain a lug protection glue without an adapter design.

[0050] Comparative Example 1: Tab protection adhesive without adapter design and preparation method thereof

[0051] The lug protection glue was prepared according to the method of Example 1, except that the hydroxy-modified polybutadiene was replaced by the same weight portion of polyisobutylene rubber (purchased from BASF, brand B10), and the other conditions were the same as those of Example 1 to obtain a lug protection glue without an adapter design.

[0052] Comparative Example 2: Tab protection adhesive without adapter design and preparation method thereof

[0053] The lug protection glue was prepared according to the method of Example 1, except that the hydroxy-modified polybutadiene was replaced by the same weight portion of mineral oil (purchased from Karamay Company, brand KN4010), and the other conditions were the same as in Example 1 to obtain the lug protection glue without adapter design.

[0054] Comparative Example 3: Tab protection adhesive without adapter design and preparation method thereof

[0055] The tab protection adhesive was prepared according to the method of Example 1, except that the anhydride-modified polypropylene wax was replaced by the same weight portion of non-anhydride-modified wax (Licocene pp 6102 from Klein), and the other conditions were the same as those of Example 1 to obtain a tab protection adhesive without an adapter design.

[0056] Test Case

[0057] (1) Viscosity: The tab protection glue obtained in the above examples and comparative examples was tested using a BROOKFIELD viscometer. 20 g of the tab protection glue was placed in a heating sleeve and melted at a temperature of 180° C. After the temperature stabilized, a No. 27 rotor was used to measure the viscosity data at a rotation speed of 10 rpm. The results are shown in Table 1.

[0058] (2) Surface drying time: The tab protection glue obtained in the above examples and comparative examples was dispensed onto an aluminum substrate at 180° C. The glue amount was 0.3 g ± 0.05 g. The finger touch method was used for testing. The time from finger touch until the glue was no longer sticky was recorded as the surface drying time. The results are shown in Table 1.

[0059] (3) Shear strength: First, preheat the 3-series aluminum substrate on a 180°C heating platform for 5 minutes, set the dispensing temperature to 180°C, quickly take the preheated substrate for dispensing, control the bonding area to 25.4mm*12.7mm, and the glue thickness to 0.15mm (controlled by copper wire). Then quickly overlap it with another preheated 3-series aluminum substrate on the overlap fixture, and finally clamp it with a dovetail clamp to prepare the sample, 5cps per group. Place the prepared sample in a constant temperature and humidity room (25°C / 55%RH) and let it stand for 24 hours. Then clamp the sample that has been cured for 24 hours on a tensile testing machine for a shear test. The tensile rate is 10mm / min. The results are shown in Table 1.

[0060] (4) Hardness: First, at 180°C, the glue was dispensed into a mold with a diameter and thickness of 15 mm. After standing for 24 h, the glue block was taken out and the hardness of the glue block was tested using a shore A hardness tester and the data was recorded. The results are shown in Table 1.

[0061] (5) Electrolyte resistance: With aluminum foil as the substrate, a line of glue was dotted on the substrate at 180°C. Then, a hot press was used to press the glue line open at 25°C and 0.2MPa for 5 seconds. The contact surface between the hot press and the glue line was separated by release paper. The release paper was removed, and the glue after pressing was left to stand for 24 hours before being placed in the electrolyte and soaked at room temperature for 7 days and 30 days. The results are shown in Table 1.

[0062] Table 1

[0063]

[0064] As can be seen from the results of Table 1, the ear protection glue provided by the present invention has low viscosity and short surface drying time. The thickness of the glue layer can be controlled to less than 0.4 mm under very small pressure. During use, there is no need to preheat the substrate, and adhesion will be generated when it comes into contact with the substrate. Furthermore, the ear protection glue provided by the present invention was soaked in the electrolyte for 7 days without falling off at all, and did not fall off or only partially fell off after soaking for 30 days, which shows that it has excellent electrolyte resistance and can achieve insulation protection for the ear. In addition, the ear protection glue provided by the present invention has lower hardness and higher flexibility (lower hardness means better flexibility), which can effectively avoid the risk of puncture during the bending of the pole piece.

[0065] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A tab protection adhesive without an adapter design, characterized in that: The ear protection glue contains a polyolefin resin, a tackifying resin, an anhydride-modified wax and a modified polybutadiene resin in a mass ratio of 100:(15-400):(5-200):(5-200), wherein the modified polybutadiene resin is selected from at least one of a hydroxyl-modified polybutadiene resin, a silane-modified polybutadiene resin and an anhydride-modified polybutadiene resin.

2. The tab protection adhesive without adapter sheet design according to claim 1, characterized in that: The content of the polyolefin resin is 10 to 60 parts by weight, the content of the tackifying resin is 10 to 40 parts by weight, the content of the anhydride modified wax is 5 to 20 parts by weight, and the content of the modified polybutadiene resin is 3 to 20 parts by weight.

3. The tab protection adhesive without adapter sheet design according to claim 1, characterized in that: The polyolefin resin is at least one of a homopolymer and a copolymer of an α-olefin and a cycloolefin; Preferably, the α-olefin is selected from at least one of ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene and 4-methyl-1-pentene; Preferably, the cycloolefin is selected from at least one of cyclobutene, cyclopentene and cyclohexene; Preferably, the number average molecular weight of the polyolefin resin is 6000 to 20000 g / mol; Preferably, the softening point of the polyolefin resin is 70°C to 170°C.

4. The tab protection adhesive without adapter design according to claim 1, characterized in that: The tackifying resin is selected from at least one of C5 petroleum resin, C9 petroleum resin, dicyclopentadiene DCPD resin, coumarone-indene resin, styrene series resin, condensation resin, hydrocarbon petroleum resin and hydrogenated petroleum resin.

5. The tab protection adhesive without adapter sheet design according to claim 1, characterized in that: The anhydride-modified wax is anhydride-modified polyethylene wax and / or anhydride-modified polypropylene wax; the content of anhydride groups in the anhydride-modified wax is preferably 1 wt % or more, more preferably 1 to 10 wt %.

6. The tab protection adhesive without adapter design according to claim 1, characterized in that: The number average molecular weight of the modified polybutadiene resin is 1000-5000; the hydroxyl value of the hydroxy-modified polybutadiene resin is 40-55 mgKOH / g; the content of silane groups in the silane-modified polybutadiene resin is 2-20 wt%; the content of anhydride groups in the anhydride-modified polybutadiene resin is 10-20 wt%.

7. The method for preparing the tab protection adhesive without adapter sheet design according to any one of claims 1 to 6, characterized in that: The method comprises the steps of melting and mixing polyolefin resin, tackifying resin, anhydride-modified wax and modified polybutadiene resin to obtain the tab protection adhesive with no transfer sheet design.

8. The method for preparing the tab protection adhesive without adapter design according to claim 7, characterized in that: The conditions for the melt mixing include a temperature of 110 to 190° C., a stirring speed of 100 to 500 rpm, a vacuum degree of less than -0.01 MPa, and a time of 1 to 5 hours.

9. Use of the tab protection adhesive with no adapter design as claimed in any one of claims 1 to 6 in a battery.

10. The use according to claim 9, characterized in that: The battery is a lithium ion battery or a lithium metal battery.

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