Lithium battery insulation film without warpage and production process thereof

Abstract

The application discloses a kind of not to be raised lithium battery insulating film and its production process, belong to lithium battery insulating film technical field, including insulating base layer, antistatic layer, anti-warp base layer and release surface layer, the two side end surfaces of insulating base layer are connected with antistatic layer by adhesive, antistatic layer is connected with anti-warp base layer by adhesive, anti-warp base layer is connected with release surface layer by adhesive.The application solves the problem that the existing lithium battery insulating film is easy to warp after long time use, so that the lithium battery and the outside world cannot be better protected in the insulating state, and the use effect of lithium battery insulating film is reduced, the anti-warp base layer composed of reinforcing layer and buffer convex point is added between the antistatic layer and the release surface layer, which can effectively avoid the lithium battery insulating film from warping after long time use, and can better protect the lithium battery and the outside world in the insulating state, and can improve the use effect of lithium battery insulating film.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery insulation film, in particular to a non-warping lithium battery insulation film and a production process thereof. BACKGROUND

[0002] Lithium battery is a kind of battery with lithium metal or lithium alloy as negative electrode material and using non-aqueous electrolyte solution. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high requirements on the environment. Lithium ion battery is a kind of secondary battery, which mainly relies on the movement of lithium ions between the positive electrode and the negative electrode to work. During the charging and discharging process, Li+ embeds and de-embeds between the two electrodes. When charging, Li+ de-embeds from the positive electrode, embeds into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state. When discharging, it is the opposite. With the development of science and technology, lithium battery has become the mainstream.

[0003] Based on the current industry power lithium battery coated insulation film, it ensures that the individual battery is in an insulating state with the outside world during the charging and discharging process. The coating insulation film process of lithium battery in the production process is one of the key processes, and the quality of the coating insulation film has an important influence on the battery performance, which is the guarantee of safety and cycle life during the use of the battery.

[0004] A kind of insulation film and single battery are disclosed in Chinese patent with publication number CN218242200U, the insulation film includes substrate and adhesive layer, adhesive layer is located on one side of substrate;Insulation film is provided with first area, second area and third area along at least one end of its length direction, first area, second area and third area are sequentially arranged along the width direction of insulation film, second area is provided with extension area away from the side edge of insulation film middle part;By setting extension area away from the side edge of insulation film middle part in second area of insulation film, extension area increases the closed length of insulation film at the turning position of the side surface of the shell of single battery, can enhance waterproof effect, improve the waterproof performance of single battery.But the above-mentioned patent has the following defects in actual use process:

[0005] The existing lithium battery insulation film is prone to edge warping after long-term use, which cannot effectively ensure that the lithium battery is in an insulating state with the outside world, and reduces the use effect of the lithium battery insulation film. SUMMARY

[0006] The present application provides a non-warping lithium battery insulation film and a production process thereof, which can effectively prevent the lithium battery insulation film from warping after long-term use, can better ensure that the lithium battery is in an insulating state with the outside world, can improve the use effect of the lithium battery insulation film, and solves the problems raised in the above background.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0008] The application discloses a non-warping lithium battery insulating film, which comprises an insulating base layer, an anti-static layer, a warp-preventing base layer and a release surface layer, the two side end faces of the insulating base layer are connected with the anti-static layer through adhesive, the anti-static layer is connected with the warp-preventing base layer through adhesive, and the warp-preventing base layer is connected with the release surface layer through adhesive, wherein the adhesive is composed of the following raw materials in mass fraction: 10-18 parts of polyvinyl acetate, 5-12 parts of polyurethane prepolymer, 4-12 parts of polyvinyl alcohol and 3-8 parts of oxidized starch, and the ratio of polyvinyl alcohol to oxidized starch is 1.5:1.

[0009] Preferably, the insulating base layer is made of PP material, PE material and PPS material as raw materials, heated and melted in a heating furnace, poured into a mold, and then the molded product is sheared and trimmed, and the excess part of the corner is precisely processed.

[0010] Preferably, the anti-static layer is composed of the following raw materials in mass fraction: 6-18 parts of anti-static nylon material, 5-12 parts of anti-static PVC material and 3-8 parts of anti-static PC material.

[0011] Preferably, the warp-preventing base layer comprises a reinforcing layer and a buffer convex point, one side end face of the reinforcing layer is connected with the anti-static layer through adhesive, the other side end face of the reinforcing layer is connected with the release surface layer through adhesive, and the reinforcing layer is provided with the buffer convex point.

[0012] Preferably, the reinforcing layer is composed of the following raw materials in mass fraction: 4-12 parts of nylon fiber and 4-15 parts of polyurethane fiber, and the mass ratio of the nylon fiber to the polyurethane fiber is 1:1-1.5.

[0013] Preferably, the buffer convex point is made of polyurethane as raw material, heated, melted and extruded through a screw extruder to form polyurethane particles, and the polyurethane particles are embedded in the reinforcing layer.

[0014] Preferably, the release surface layer is a PET-based silicone oil release film, and the thickness of the release surface layer is 20-60 microns.

[0015] According to another aspect of the application, a production process of the non-warping lithium battery insulating film is provided, which comprises the following steps:

[0016] S1: placing the insulating base layer on a laminator, applying adhesive on the insulating base layer, placing the anti-static layer on the insulating base layer, and laminating the insulating base layer and the anti-static layer together by using the laminator;

[0017] S2: applying adhesive on the anti-static layer, placing the warp-preventing base layer on the anti-static layer, and laminating the anti-static layer and the warp-preventing base layer together by using the laminator.

[0018] S3: Apply adhesive on the anti-warping base layer, place the release surface layer on the anti-warping base layer, and use a laminator to press the anti-warping base layer and the release surface layer together;

[0019] S4: Shearing and trimming the insulation base layer, anti-static layer, anti-warping base layer and release surface layer that are pressed together, and precisely processing the excess parts of the corners to produce a lithium battery insulation film.

[0020] Compared with the prior art, the beneficial effects of the present application are:

[0021] The non-warping lithium battery insulation film and its production process can effectively prevent the lithium battery insulation film from warping after long-term use, better ensure the insulation of the lithium battery from the outside world, and improve the use effect of the lithium battery insulation film. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the axonometric view of the non-warping lithium battery insulation film of the present application;

[0023] Figure 2 is the enlarged view of A in the Figure 1 ;

[0024] Figure 3 is the enlarged view of A in the Figure 2 ;

[0025] Figure 4 is the enlarged view of B in the Figure 3 .

[0026] In the figure: 1, insulation base layer; 2, anti-static layer; 3, anti-warping base layer; 31, reinforcing layer; 32, buffer bump; 4, release surface layer. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0028] To solve the problem that the existing lithium battery insulation film is prone to warping after long-term use, thereby failing to better ensure the insulation of the lithium battery from the outside world and reducing the use effect of the lithium battery insulation film, please refer to Figures 1-4 , the present embodiment provides the following technical solutions:

[0029] Embodiment one

[0030] A kind of not to rise lithium battery insulating film, including insulating base layer 1, anti-static layer 2, anti-warp base layer 3 and off-type surface layer 4, the two side end surfaces of insulating base layer 1 are connected with anti-static layer 2 by adhesive, anti-static layer 2 is connected with anti-warp base layer 3 by adhesive, anti-warp base layer 3 is connected with off-type surface layer 4 by adhesive, wherein the adhesive is composed of the following mass fraction of raw materials: polyvinyl acetate 10-18 parts, polyurethane prepolymer 5-12 parts, polyvinyl alcohol 4-12 parts and oxidized starch 3-8 parts, and the ratio of polyvinyl alcohol and oxidized starch is 1.5:1.

[0031] Insulating base layer 1 is made of PP material, PE material and PPS material as raw material, heated and melted by heating furnace, poured into the mold, after the mold is formed, the shaped product is sheared and trimmed, and the excess part of the corner is precisely treated.

[0032] It should be noted that the use of PP material, PE material and PPS material to make insulating base layer 1 can greatly improve the insulation performance of lithium battery insulating film.

[0033] Anti-static layer 2 is composed of the following mass fraction of raw materials: anti-static nylon material 6-18 parts, anti-static PVC material 5-12 parts and anti-static PC material 3-8 parts.

[0034] It should be noted that the use of anti-static nylon material, anti-static PVC material and anti-static PC material to make anti-static layer 2 can greatly improve the anti-static performance of lithium battery insulating film.

[0035] Anti-warp base layer 3 includes reinforcing layer 31 and buffer convex point 32, one side end surface of reinforcing layer 31 is connected on anti-static layer 2 by adhesive, the other side end surface of reinforcing layer 31 is connected on off-type surface layer 4 by adhesive, and buffer convex point 32 is arranged in reinforcing layer 31.

[0036] It should be noted that anti-warp base layer 3 can effectively avoid the edge lifting of lithium battery insulating film after long time use, and can better protect the lithium battery in insulating state with the outside world, and can improve the use effect of lithium battery insulating film.

[0037] Reinforcing layer 31 is composed of the following mass fraction of raw materials: nylon fiber 4 parts and polyurethane fiber 4 parts, wherein the mass ratio of nylon fiber and polyurethane fiber is 1:1-1.5.

[0038] It should be noted that nylon fiber is named polyamide fiber, which is the first synthetic polymer commercialized synthetic fiber product, which has the following characteristics:

[0039] Wear resistance: under the same conditions, its wear resistance is 10 times that of cotton and 20 times that of wool. If 15% of polyamide fibers are added to wool or cotton, the wear resistance of the material is increased by 3 times compared with pure wool or cotton.

[0040] Breaking strength: the breaking strength of the polyamide fiber for clothing is 5.0-6.4 g / d, and the high-strength fiber for industrial use is 7-9.5 g / d or even higher. The breaking strength of the wet state is about 85%-90% of that of the dry state.

[0041] Breaking elongation: the breaking elongation of polyamide fibers varies with different types. The elongation of high-strength fibers is lower, between 10% and 25%. The elongation of general clothing fibers is between 25% and 40%. The breaking elongation of the wet state is about 3-5% higher than that of the dry state.

[0042] Elastic recovery rate: the elastic recovery rate of polyamide fibers is excellent. When the elongation is 10%, the elastic recovery rate is 99%, while the elastic recovery rate of polyester is 67% under the same conditions, and the elastic recovery rate of rayon is only 32%.

[0043] Fatigue resistance: due to the good elastic recovery rate of polyamide fibers, the fatigue resistance is also good. The fatigue resistance of polyamide fibers is close to that of polyester fibers and higher than that of other chemical fibers and natural fibers. Under the same test conditions, the fatigue resistance of polyamide fibers is 7-8 times that of cotton fibers and several hundred times that of rayon.

[0044] It should be noted that polyurethane fibers have the characteristics of high breaking elongation, low modulus and high elastic recovery rate. In addition to high strength, other physical and mechanical properties are very similar to natural latex fibers. It is more resistant to chemical degradation than latex fibers and has moderate thermal stability with a softening temperature of about 200°C or higher.

[0045] Specifically, the reinforcing layer 31 is made of nylon fibers and polyurethane fibers, which can improve the overall strength of the anti-warping base layer 3 and prevent the anti-warping base layer 3 from warping due to bending.

[0046] The buffer protrusions 32 are made of polyurethane as raw material, heated, melted and extruded by a screw extruder to form polyurethane particles, and the polyurethane particles are embedded in the reinforcing layer 31.

[0047] It should be noted that the buffer protrusions 32 made of polyurethane as raw material have high wear resistance, high hardness and elasticity, which can effectively buffer the bending force received by the lithium battery insulation film as a whole, further preventing the lithium battery insulation film from warping due to bending.

[0048] The release surface layer 4 is a silicone oil release film with a PET substrate, and the thickness of the release surface layer 4 is 20-60 μm.

[0049] In order to better show the production process of the non-warping lithium battery insulating film, the embodiment presents a production process of the non-warping lithium battery insulating film, which comprises the following steps:

[0050] S1: Place the insulating base layer 1 on the laminator, and apply adhesive on the insulating base layer 1, place the anti-static layer 2 on the insulating base layer 1, and use the laminator to press the insulating base layer 1 and the anti-static layer 2 together;

[0051] S2: Apply adhesive on the anti-static layer 2, place the anti-warping base layer 3 on the anti-static layer 2, and use the laminator to press the anti-static layer 2 and the anti-warping base layer 3 together;

[0052] S3: Apply adhesive on the anti-warping base layer 3, place the release surface layer 4 on the anti-warping base layer 3, and use the laminator to press the anti-warping base layer 3 and the release surface layer 4 together;

[0053] S4: Shearing and trimming the insulating base layer 1, anti-static layer 2, anti-warping base layer 3 and release surface layer 4 that are pressed together, and precisely processing the excess parts of the edges and corners to produce the lithium battery insulating film.

[0054] Example two

[0055] A non-warping lithium battery insulating film, comprising an insulating base layer 1, an anti-static layer 2, an anti-warping base layer 3 and a release surface layer 4, the two side end faces of the insulating base layer 1 are connected with the anti-static layer 2 by adhesive, the anti-static layer 2 is connected with the anti-warping base layer 3 by adhesive, and the anti-warping base layer 3 is connected with the release surface layer 4 by adhesive, wherein the adhesive is composed of the following raw materials in mass fraction: polyvinyl acetate 10-18 parts, polyurethane prepolymer 5-12 parts, polyvinyl alcohol 4-12 parts and oxidized starch 3-8 parts, and the ratio of polyvinyl alcohol to oxidized starch is 1.5:1.

[0056] The insulating base layer 1 is made of PP material, PE material and PPS material as raw materials, heated and melted in a heating furnace, poured into the mold, and after the mold is formed, the formed product is sheared and trimmed, and the excess parts of the edges and corners are precisely processed.

[0057] It should be noted that the use of PP material, PE material and PPS material to make the insulating base layer 1 can greatly improve the insulating performance of the lithium battery insulating film.

[0058] The anti-static layer 2 is composed of the following raw materials in mass fraction: anti-static nylon material 6-18 parts, anti-static PVC material 5-12 parts and anti-static PC material 3-8 parts.

[0059] It should be noted that the use of anti-static nylon material, anti-static PVC material and anti-static PC material to make the anti-static layer 2 can greatly improve the anti-static performance of the lithium battery insulating film.

[0060] The anti-warping base layer 3 comprises a reinforcing layer 31, one side end face of the reinforcing layer 31 is connected to the anti-static layer 2 through an adhesive, the other side end face of the reinforcing layer 31 is connected to the release surface layer 4 through an adhesive, and the reinforcing layer 31 is provided with a buffer bump 32.

[0061] It should be noted that the anti-warping base layer 3 can effectively prevent the lithium battery insulating film from warping after long-term use, and can better ensure that the lithium battery is in an insulating state with the outside world, thereby improving the use effect of the lithium battery insulating film.

[0062] The reinforcing layer 31 is composed of the following raw materials in mass fraction: nylon fiber 4 parts and polyurethane fiber 4 parts, wherein the mass ratio of nylon fiber to polyurethane fiber is 1:1-1.5.

[0063] Specifically, the reinforcing layer 31 is made of nylon fiber and polyurethane fiber, which can improve the overall strength of the anti-warping base layer 3 and prevent the anti-warping base layer 3 from warping due to bending.

[0064] The release surface layer 4 is a PET-based silicone oil release film, and the thickness of the release surface layer 4 is 20-60 μm.

[0065] The lithium battery insulating film is prepared by the same production process as in Example 1, and the difference between Example 1 and Example 2 is that the reinforcing layer 31 in Example 2 is not provided with a buffer bump 32.

[0066] Example Three

[0067] An anti-warping lithium battery insulating film comprises an insulating base layer 1, an anti-static layer 2, an anti-warping base layer 3, and a release surface layer 4, the two side end faces of the insulating base layer 1 are connected with the anti-static layer 2 through an adhesive, the anti-static layer 2 is connected with the anti-warping base layer 3 through an adhesive, and the anti-warping base layer 3 is connected with the release surface layer 4 through an adhesive, wherein the adhesive is composed of the following raw materials in mass fraction: polyvinyl acetate 10-18 parts, polyurethane prepolymer 5-12 parts, polyvinyl alcohol 4-12 parts, and oxidized starch 3-8 parts, and the ratio of polyvinyl alcohol to oxidized starch is 1.5:1.

[0068] The insulating base layer 1 is made of PP material, PE material and PPS material as raw materials, heated and melted in a heating furnace, poured into a mold, and after the mold is formed, the formed product is cut and trimmed, and the excess parts of the corners are precisely processed.

[0069] It should be noted that the insulating base layer 1 is made of PP material, PE material and PPS material, which can greatly improve the insulating performance of the lithium battery insulating film.

[0070] The anti-static layer 2 is made of the following raw materials in mass parts: anti-static nylon material 6-18 parts, anti-static PVC material 5-12 parts, and anti-static PC material 3-8 parts.

[0071] It should be noted that the anti-static layer 2 is made of anti-static nylon material, anti-static PVC material and anti-static PC material, which can greatly improve the anti-static performance of the lithium battery insulation film.

[0072] The anti-warping base layer 3 includes a reinforcing layer 31 and a buffer bump 32. One side of the reinforcing layer 31 is connected to the anti-static layer 2 by an adhesive, and the other side of the reinforcing layer 31 is connected to the release surface layer 4 by an adhesive. The reinforcing layer 31 has a buffer bump 32 embedded therein.

[0073] It should be noted that the anti-warping base layer 3 can effectively prevent the lithium battery insulation film from warping after long-term use, and can better ensure that the lithium battery is in an insulating state with the outside world, thereby improving the use effect of the lithium battery insulation film.

[0074] The reinforcing layer 31 is made of the following raw materials in mass parts: nylon fiber 4 parts and polyurethane fiber 15 parts, wherein the mass ratio of nylon fiber to polyurethane fiber is 1:1-1.5.

[0075] Specifically, the reinforcing layer 31 is made of nylon fiber and polyurethane fiber, which can improve the overall strength of the anti-warping base layer 3 and prevent the anti-warping base layer 3 from warping due to bending.

[0076] The buffer bump 32 is made of polyurethane as a raw material, which is heated, melted and extruded by a screw extruder to form polyurethane particles, wherein the polyurethane particles are embedded in the reinforcing layer 31.

[0077] It should be noted that the buffer bump 32 made of polyurethane has good wear resistance, high hardness and elasticity, which can effectively buffer the bending force of the lithium battery insulation film and further prevent the lithium battery insulation film from warping due to bending.

[0078] The release surface layer 4 is a PET-based silicone release film with a thickness of 20-60 μm.

[0079] The lithium battery insulation film is prepared by the same production process as in Example One, except that the mass parts of polyurethane fiber are increased in Example Three.

[0080] Example Four

[0081] The application discloses a non-curling lithium battery insulating film which comprises an insulating base layer 1, an anti-static layer 2, an anti-curling base layer 3 and a release surface layer 4, the two side end faces of the insulating base layer 1 are connected with the anti-static layer 2 through adhesive, the anti-static layer 2 is connected with the anti-curling base layer 3 through adhesive, and the anti-curling base layer 3 is connected with the release surface layer 4 through adhesive, wherein the adhesive is composed of the following raw materials in mass fraction: 10-18 parts of polyvinyl acetate, 5-12 parts of polyurethane prepolymer, 4-12 parts of polyvinyl alcohol and 3-8 parts of oxidized starch, and the ratio of polyvinyl alcohol to oxidized starch is 1.5:1.

[0082] The insulating base layer 1 is made of PP material, PE material and PPS material, is heated and melted in a heating furnace, is poured into a mold, is cut and trimmed after being shaped in the mold, and is precisely processed at the corners to be made.

[0083] It should be noted that the insulating base layer 1 made of PP material, PE material and PPS material can greatly improve the insulation performance of the lithium battery insulating film.

[0084] The anti-static layer 2 is composed of the following raw materials in mass fraction: 6-18 parts of anti-static nylon material, 5-12 parts of anti-static PVC material and 3-8 parts of anti-static PC material.

[0085] It should be noted that the anti-static layer 2 made of anti-static nylon material, anti-static PVC material and anti-static PC material can greatly improve the anti-static performance of the lithium battery insulating film.

[0086] The anti-curling base layer 3 comprises a reinforcing layer 31 and a buffer convex point 32, one side end face of the reinforcing layer 31 is connected to the anti-static layer 2 through adhesive, the other side end face of the reinforcing layer 31 is connected to the release surface layer 4 through adhesive, and the buffer convex point 32 is arranged in the reinforcing layer 31.

[0087] It should be noted that the anti-curling base layer 3 can effectively avoid the edge curling of the lithium battery insulating film after long-time use, can better guarantee that the lithium battery is in an insulating state with the outside world, and can improve the use effect of the lithium battery insulating film.

[0088] The reinforcing layer 31 is composed of the following raw materials in mass fraction: 12 parts of nylon fiber and 4 parts of polyurethane fiber, and the mass ratio of the nylon fiber to the polyurethane fiber is 1:1-1.5.

[0089] Specifically, the reinforcing layer 31 made of nylon fiber and polyurethane fiber can improve the overall strength of the anti-curling base layer 3 and avoid edge curling of the anti-curling base layer 3 due to bending.

[0090] The buffer convex point 32 is made of polyurethane, heated, melted and extruded by a screw extruder to form polyurethane particles, wherein the polyurethane particles are embedded in the reinforcing layer 31.

[0091] It should be noted that the buffer convex point 32 made of polyurethane has high wear resistance, hardness and elasticity, which can effectively buffer the bending force of the lithium battery insulation film as a whole, further avoiding the edge lifting of the lithium battery insulation film due to bending.

[0092] The release surface layer 4 is a silicon oil release film with a PET substrate, and the thickness of the release surface layer 4 is 20-60μm.

[0093] The lithium battery insulation film is prepared by the same production process as Example 1, and the difference from Example 1 is that the mass fraction of nylon fiber is increased in Example 4.

[0094] Comparative Example

[0095] A lithium battery insulation film without edge lifting includes an insulation base layer 1, an anti-static layer 2 and a release surface layer 4, the two side end faces of the insulation base layer 1 are connected with the anti-static layer 2 by adhesive, and the anti-static layer 2 is connected with the release surface layer 4 by adhesive, wherein the adhesive is composed of the following raw materials in mass fraction: polyvinyl acetate 10-18 parts, polyurethane prepolymer 5-12 parts, polyvinyl alcohol 4-12 parts and oxidized starch 3-8 parts, and the ratio of polyvinyl alcohol to oxidized starch is 1.5:1.

[0096] The insulation base layer 1 is made of PP material, PE material and PPS material as raw materials, heated and melted by a heating furnace, poured into a mold, and after the mold is formed, the formed product is sheared and edged, and the excess parts of the corners are precisely processed.

[0097] It should be noted that the use of PP material, PE material and PPS material to make the insulation base layer 1 can greatly improve the insulation performance of the lithium battery insulation film.

[0098] The anti-static layer 2 is composed of the following raw materials in mass fraction: anti-static nylon material 6-18 parts, anti-static PVC material 5-12 parts and anti-static PC material 3-8 parts.

[0099] It should be noted that the use of anti-static nylon material, anti-static PVC material and anti-static PC material to make the anti-static layer 2 can greatly improve the anti-static performance of the lithium battery insulation film.

[0100] The release surface layer 4 is a silicon oil release film with a PET substrate, and the thickness of the release surface layer 4 is 20-60μm.

[0101] The lithium battery insulation film is prepared by the same production process as Example 1, and the difference from Example 1 is that the anti-edge base layer 3 is cancelled in the comparative example.

[0102] It should be noted that the lithium battery insulation film is prepared according to the production process provided in Examples 1-4 and Comparative Example, and the prepared lithium battery insulation film is subjected to the edge curling test, and the test results are shown in Table 1:

[0103] Table 1: Edge curling test results of lithium battery insulation film

[0104]

[0105] It should be noted that the higher the percentage of the edge curling test results of the prepared lithium battery insulation film, the more serious the edge curling.

[0106] As can be seen from Table 1, the lithium battery insulation films prepared in Examples 1-4 can effectively prevent edge curling.

[0107] Among them, compared with Example 1, the edge curling prevention performance of Example 2 decreases, which shows that the setting of the buffer bump 32 in the reinforcing layer 31 can improve the edge curling prevention performance of the lithium battery insulation film.

[0108] Among them, compared with Example 1, the edge curling prevention performance of Example 3 improves, which shows that increasing the mass fraction of polyurethane fiber can improve the edge curling prevention performance of the lithium battery insulation film.

[0109] Among them, compared with Example 1, the edge curling prevention performance of Example 4 improves, which shows that increasing the mass fraction of nylon fiber can improve the edge curling prevention performance of the lithium battery insulation film.

[0110] Among them, compared with Example 1, the edge curling prevention performance of the comparative example decreases, which shows that increasing the anti-edge base layer 3 can improve the edge curling prevention performance of the lithium battery insulation film.

[0111] In summary, the non-edge lithium battery insulation film and the production process thereof can effectively avoid the edge curling of the lithium battery insulation film after long-term use, can better ensure that the lithium battery is in an insulating state with the outside world, and can improve the use effect of the lithium battery insulation film.

[0112] It should be noted that in this document, relational terms such as first and second and the like can only be used to distinguish one entity or action from another entity or action, without necessarily requiring or implying that these entities or actions exist in any actual relationship or order. Moreover, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusions, so that a process, method, article or apparatus that includes a list of elements does not only include those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or apparatus.

[0113] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous changes, modifications, substitutions and variations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A manufacturing process for a non-warping lithium battery insulating film, used to produce a non-warping lithium battery insulating film, wherein the non-warping lithium battery insulating film comprises an insulating base layer (1), an antistatic layer (2), an anti-warping base layer (3), and a release layer (4), characterized in that: The insulating base layer (1) has an antistatic layer (2) connected to both ends of the base layer (1) by an adhesive. The antistatic layer (2) is connected to an anti-warping base layer (3) by an adhesive. The anti-warping base layer (3) is connected to a release layer (4) by an adhesive. The adhesive is composed of the following raw materials in parts by mass: 10-18 parts of polyvinyl acetate, 5-12 parts of polyurethane prepolymer, 4-12 parts of polyvinyl alcohol and 3-8 parts of oxidized starch, and the ratio of polyvinyl alcohol to oxidized starch is 1.5:

1. The anti-warping base layer (3) includes a reinforcing layer (31) and buffer bumps (32). One end face of the reinforcing layer (31) is connected to the antistatic layer (2) by an adhesive, and the other end face of the reinforcing layer (31) is connected to the release layer (4) by an adhesive. Buffer bumps (32) are provided in the reinforcing layer (31). The manufacturing process for non-tilting lithium battery insulating film includes the following steps: S1: Place the insulating base layer (1) on the laminator and apply adhesive to the insulating base layer (1). Place the antistatic layer (2) on the insulating base layer (1) and press the insulating base layer (1) and the antistatic layer (2) together using the laminator. S2: Apply adhesive to the antistatic layer (2), place the anti-warping base layer (3) on the antistatic layer (2), and press the antistatic layer (2) and the anti-warping base layer (3) together using a laminator; S3: Apply adhesive to the anti-warping base layer (3), place the release layer (4) on the anti-warping base layer (3), and use a laminator to press the anti-warping base layer (3) and the release layer (4) together; S4: The insulating base layer (1), antistatic layer (2), anti-warping base layer (3) and release layer (4) that are pressed together are cut and trimmed, and the excess parts at the corners are precisely processed to produce a lithium battery insulating film.

2. The manufacturing process of a non-tilting lithium battery insulating film according to claim 1, characterized in that: The insulating base layer (1) is made of PP material, PE material and PPS material as raw materials. After being heated and melted in a heating furnace, it is poured into the mold. After the mold is formed, the formed product is cut and trimmed, and the excess parts at the corners are precisely processed to make it.

3. The manufacturing process for a non-tilting lithium battery insulating film according to claim 2, characterized in that: The antistatic layer (2) is composed of the following parts by weight of raw materials: 6-18 parts of antistatic nylon material, 5-12 parts of antistatic PVC material and 3-8 parts of antistatic PC material.

4. The manufacturing process of a non-tilting lithium battery insulating film according to claim 3, characterized in that: The reinforcing layer (31) is composed of the following parts by weight of raw materials: 4-12 parts of nylon fiber and 4-15 parts of polyurethane fiber, wherein the mass ratio of nylon fiber to polyurethane fiber is 1:1-1.

5.

5. The manufacturing process for a non-tilting lithium battery insulating film according to claim 4, characterized in that: The buffer bumps (32) are made of polyurethane as raw material, which is heated, melted and extruded by a screw extruder to form polyurethane particles, wherein the polyurethane particles are embedded in the reinforcing layer (31).

6. The manufacturing process of a non-tilting lithium battery insulating film according to claim 5, characterized in that: The release layer (4) is a silicone oil release film with a PET substrate, and the thickness of the release layer (4) is 20-60μm.

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