阅读说明：本技术 一种动力电池侧板绝缘胶膜 (Power battery side plate insulating glue film ) 是由 谢海龙 邓建波 陈洪野 吴小平 于 2020-12-29 设计创作，主要内容包括：本发明公开了一种动力电池侧板绝缘胶膜,所述绝缘胶膜包括薄膜层、以及涂覆在薄膜层上胶黏剂层,可在低压力0.2Mpa～1Mpa、短的热压时间300s～900s下完成热压,同时对低表面能铝板都有良好的粘合强度和粘接效果,所述胶黏剂层为热熔胶层或热固胶层,所述胶黏剂层包括以下重量份组分：基体树脂30～80份、增粘树脂10～30份、阻燃剂20～70份、偶联剂0.05～1份、固化剂1～5份、固化促进剂0.1～0.5份和溶剂20～30份,所述基体树脂与增粘树脂总量为100份。本发明用于电池模组的侧板绝缘,能够使得侧板达到阻燃和耐冷热冲击的性能,并且易于实施,只需将该绝缘膜直接热压贴覆于铝板制成叠层结构即可,该绝缘胶膜性能稳定,生产效率高,性价比高。(The invention discloses an insulating adhesive film for a power battery side plate, which comprises a thin film layer and an adhesive layer coated on the thin film layer, can finish hot pressing under low pressure of 0.2 Mpa-1 Mpa and short hot pressing time of 300 s-900 s, and has good adhesive strength and bonding effect on low surface energy aluminum plates, wherein the adhesive layer is a hot melt adhesive layer or a thermosetting adhesive layer, and comprises the following components in parts by weight: 30-80 parts of matrix resin, 10-30 parts of tackifying resin, 20-70 parts of flame retardant, 0.05-1 part of coupling agent, 1-5 parts of curing agent, 0.1-0.5 part of curing accelerator and 20-30 parts of solvent, wherein the total amount of the matrix resin and the tackifying resin is 100 parts. The side plate insulation film is used for insulation of the side plate of the battery module, can enable the side plate to achieve the performances of flame retardance and cold and heat shock resistance, is easy to implement, only needs to be directly hot-pressed and pasted on an aluminum plate to form a laminated structure, and is stable in performance, high in production efficiency and high in cost performance.)

1. The utility model provides a power battery curb plate insulating glue membrane which characterized in that: the insulating glued membrane includes thin layer (1) and coating adhesive layer (2) on thin layer (1), adhesive layer (2) are hot melt adhesive layer or thermosetting adhesive layer, adhesive layer (2) include the following part by weight component: 70-90 parts of matrix resin, 10-30 parts of tackifying resin, 20-70 parts of flame retardant, 0.05-1 part of coupling agent, 1-5 parts of curing agent, 0.1-0.5 part of curing accelerator and 20-30 parts of solvent, wherein the total amount of the matrix resin and the tackifying resin is 100 parts.

2. The power battery side plate insulating glue film as claimed in claim 1, wherein: the matrix resin is one or a mixture of more of polyester resin, polyurethane, alkyd resin, epoxy resin, acrylic resin and silica gel.

3. The power battery side plate insulating glue film as claimed in claim 1, wherein: the tackifying resin is one or a mixture of rosin resin, terpene resin, petroleum resin and phenolic resin.

4. The power battery side plate insulating glue film as claimed in claim 1, wherein: the flame retardant is one or a mixture of several of phosphorus flame retardant, nitrogen flame retardant and silicon flame retardant.

5. The power battery side plate insulating glue film as claimed in claim 1, wherein: the coupling agent is a silane coupling agent or a titanate coupling agent.

6. The power battery side plate insulating glue film as claimed in claim 1, wherein: the curing agent is one or a mixture of more of isocyanate curing agent, latent amine curing agent, cyanate curing agent and anhydride curing agent.

7. The power battery side plate insulating glue film as claimed in claim 1, wherein: the curing accelerator is an organic tin accelerator.

8. The power battery side plate insulating glue film as claimed in claim 1, wherein: the solvent is one or a mixture of ethyl acetate and butanone.

9. The power battery side plate insulating glue film as claimed in claim 1, wherein: the film layer (1) is any one of a polyethylene terephthalate film layer, a polybutylene terephthalate film layer, a polyethylene naphthalate film layer or a polyimide film layer.

10. The power battery side plate insulating glue film as claimed in claim 1, wherein: the thickness of the film layer (1) is 50-150 mu m, and the thickness of the adhesive layer (2) is 0.025 mm-0.040 mm.

Technical Field

The invention belongs to the technical field of insulating glue films, and particularly relates to a power battery side plate insulating glue film.

Background

At present, because of the advantages of low emission, light pollution, low maintenance and the like, the electric automobile gradually replaces the traditional fuel oil automobile, a battery pack is used as a power source of the electric automobile and is usually formed by combining a plurality of battery modules, the battery modules are formed by combining side plates, end plates and lithium batteries arranged in a module frame formed by the side plates and the end plates, the side plates of the battery modules are generally aluminum plates, one side surface of each aluminum plate needs to be insulated, so that the side surface needs to be covered with an insulating layer, the insulating layers of the side plates are all formed by hot pressing through a hot pressing insulating adhesive film bonding aluminum plate process laminated structure, the surface is covered with the insulating layers at present, and the hot pressing condition pressure is more than 2Mpa hot; the number of the laminated layers is increased for improving the efficiency, the hot pressing time of the side plate production is prolonged due to the increase of the number, and meanwhile, the hot pressing pressure is unstable, so that the poor hot pressing in large batch can be caused; meanwhile, when the aluminum plate with low surface energy is used, poor hot-press bonding in batch can also occur; meanwhile, part of novel water-cooling side plates cannot be subjected to high-pressure and long-time hot pressing due to the hollow structure.

Disclosure of Invention

The invention aims to provide an insulating adhesive film for a side plate of a power battery, which can enable the side plate to achieve the performances of flame retardance and cold and heat shock resistance, is easy to implement, and has stable performance, high production efficiency and high cost performance.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides an insulating glued membrane of power battery curb plate, insulating glued membrane includes the thin layer and coats on the thin layer adhesive layer, can accomplish the hot pressing under low pressure 0.2Mpa ~ 1Mpa, short hot pressing time 300s ~ 900s, all has good adhesive strength and bonding effect to low surface energy aluminum plate simultaneously, the adhesive layer is hot melt adhesive layer or hot setting glue film, the adhesive layer includes following parts by weight component: 30-80 parts of matrix resin, 10-30 parts of tackifying resin, 20-70 parts of flame retardant, 0.05-1 part of coupling agent, 1-5 parts of curing agent, 0.1-0.5 part of curing accelerator and 20-30 parts of solvent, wherein the total amount of the matrix resin and the tackifying resin is 100 parts.

The technical scheme of further improvement in the technical scheme is as follows:

1. in the scheme, the matrix resin is one or a mixture of modified resin of polyester resin, polyurethane, alkyd resin, epoxy resin, acrylic resin and silica gel.

2. In the scheme, the tackifying resin is one or a mixture of rosin resin, terpene resin, petroleum resin and phenolic resin.

3. In the scheme, the flame retardant is one or a mixture of several of a phosphorus flame retardant, a nitrogen flame retardant and a silicon flame retardant.

4. In the above scheme, the coupling agent is a silane coupling agent or a titanate coupling agent.

5. In the scheme, the curing agent is one or a mixture of more of isocyanate curing agent, latent amine curing agent, cyanate curing agent and anhydride curing agent.

6. In the above scheme, the curing accelerator is an organotin accelerator.

7. In the scheme, the solvent is one or a mixture of ethyl acetate and butanone.

8. In the above scheme, the film layer is any one of a polyethylene terephthalate film layer, a polybutylene terephthalate film layer, a polyethylene naphthalate film layer or a polyimide film layer.

9. In the scheme, the thickness of the film layer is 50-150 mu m, and the thickness of the adhesive layer is 0.025 mm-0.040 mm.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

the power battery side plate insulating film disclosed by the invention is formed by combining the insulating film layer and the adhesive layer, is simple in structure, and the adhesive layer is a hot-melt adhesive layer or a thermosetting adhesive layer and is used for insulating the side plate of the battery module, so that the side plate can achieve the performances of flame retardance and cold and thermal shock resistance, and is easy to implement.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

In the figure: 1. a thin film layer; 2. and an adhesive layer.

Detailed Description

The invention is further described below with reference to the following examples:

an insulating adhesive film for a power battery side plate comprises a film layer 1 and an adhesive layer 2 coated on the film layer 1, wherein the adhesive layer 2 is a hot melt adhesive layer or a thermosetting adhesive layer; the insulating film has wide processing hot pressing window range, and has good bonding strength and bonding effect at low pressure of 0.2-1 Mpa and short hot pressing time of 300-900 s; and also has excellent adhesive strength to aluminum plates with low surface energy.

Furthermore, the adhesive system of the adhesive can be one or a mixture of modified adhesives of polyester resin, polyurethane, alkyd resin, epoxy resin, acrylic resin and silica gel. The glue of the insulating film has good adhesive strength to the aluminum plate, and has good adhesive strength and bonding effect even at low pressure of 0.2MPa to 1MPa, short hot pressing time of 300s to 900s and low surface energy of the aluminum plate. Furthermore, the thickness of the insulating film layer and the adhesive layer and the content of the flame-retardant filler in the adhesive layer can be adjusted according to the insulation and flame-retardant requirements of the side plate, wherein the thickness of the insulating film layer is 0.050 mm-0.15 mm, and the thickness of the adhesive layer is 0.025 mm-0.040 mm.

The adhesive layer is added with tackifying resin besides the main resin and the flame-retardant filler; the tackifying resin has excellent heat resistance and excellent polymer intermiscibility, the heat resistance of the adhesive layer of the insulating adhesive film adhesive is obviously improved after the tackifying resin is used, most of the tackifying resin is small-molecular resin, the fluidity of the adhesive layer is improved during hot pressing after the tackifying resin is added, and the wettability of the adhesive layer on the surface of an aluminum plate is improved, so that the adhesive film can keep good bonding effect and bonding performance under low pressure and short time of hot pressing.

Example 1: the insulating adhesive film of the power battery side plate comprises a thin film layer 1 and an adhesive layer 2 coated on the thin film layer 1, wherein the thickness of the thin film layer is 50 micrometers, the thickness of the adhesive layer is 0.025mm, and the adhesive layer 2 comprises the following components in percentage by weight: 90 parts of matrix resin, 10 parts of tackifying resin, 50 parts of flame retardant, 0.05 part of coupling agent, 5 parts of curing agent, 0.1 part of curing accelerator and 20 parts of solvent.

The matrix resin is polyester resin; the tackifying resin is rosin resin; the flame retardant is a phosphorus flame retardant; the coupling agent is a silane coupling agent; the curing agent is isocyanate curing agent; the curing accelerator is an organic tin accelerator; the solvent is a mixture of ethyl acetate and butanone; the film layer is a polyethylene terephthalate film layer.

Example 2: the insulating adhesive film of the power battery side plate comprises a thin film layer 1 and an adhesive layer 2 coated on the thin film layer 1, wherein the thickness of the thin film layer is 60 micrometers, the thickness of the adhesive layer is 0.040mm, and the adhesive layer 2 comprises the following components in percentage by weight: 85 parts of matrix resin, 15 parts of tackifying resin, 30 parts of flame retardant, 0.06 part of coupling agent, 3 parts of curing agent, 0.2 part of curing accelerator and 25 parts of solvent.

The matrix resin is polyurethane; the tackifying resin is terpene resin; the flame retardant is a nitrogen flame retardant; the coupling agent is titanate coupling agent; the curing agent is an anhydride curing agent; the curing accelerator is an organic tin accelerator; the solvent is ethyl acetate; the film layer is a polyethylene naphthalate film layer.

Example 3: the utility model provides a power battery curb plate insulating glued membrane, insulating glued membrane includes thin layer 1 and the coating of coating on thin layer 1 gluing agent layer 2, thin layer thickness is 100 mu m, gluing agent layer thickness is 0.030mm, gluing agent layer 2 includes the following weight percent's component: 75 parts of matrix resin, 25 parts of tackifying resin, 20 parts of flame retardant, 0.08 part of coupling agent, 1 part of curing agent, 0.5 part of curing accelerator and 30 parts of solvent.

The matrix resin is epoxy resin; the tackifying resin is petroleum resin; the flame retardant is a silicon flame retardant; the coupling agent is a silane coupling agent; the curing agent is cyanate ester curing agent; the curing accelerator is an organic tin accelerator; the solvent is butanone; the film layer is a polybutylene terephthalate film layer.

Example 4: the insulating adhesive film of the power battery side plate comprises a thin film layer 1 and an adhesive layer 2 coated on the thin film layer 1, wherein the thickness of the thin film layer is 150 micrometers, the thickness of the adhesive layer is 0.035mm, and the adhesive layer 2 comprises the following components in percentage by weight: 70 parts of matrix resin, 30 parts of tackifying resin, 60 parts of flame retardant, 1 part of coupling agent, 2 parts of curing agent, 0.2 part of curing accelerator and 20 parts of solvent.

The matrix resin is a mixed modified resin of polyester resin and acrylic resin; the tackifying resin is phenolic resin; the flame retardant is a nitrogen flame retardant; the coupling agent is titanate coupling agent; the curing agent is isocyanate curing agent; the curing accelerator is an organic tin accelerator; the solvent is ethyl acetate and butanone; the film layer is a polybutylene terephthalate film layer.

Example 5: the insulating adhesive film of the power battery side plate comprises a thin film layer 1 and an adhesive layer 2 coated on the thin film layer 1, wherein the thickness of the thin film layer is 120 micrometers, the thickness of the adhesive layer is 0.025mm, and the adhesive layer 2 comprises the following components in percentage by weight: 70 parts of matrix resin, 30 parts of tackifying resin, 70 parts of flame retardant, 0.09 part of coupling agent, 2.5 parts of curing agent, 0.3 part of curing accelerator and 30 parts of solvent.

The matrix resin is alkyd resin; the tackifying resin is a mixed modified resin of rosin resin and terpene resin; the flame retardant is a silicon flame retardant; the coupling agent is titanate coupling agent; the curing agent is a mixture of cyanate curing agent and anhydride curing agent; the curing accelerator is an organic tin accelerator; the solvent is butanone; the film layer is a polyethylene naphthalate film layer.

Comparative example 1: the insulating adhesive film of the power battery side plate comprises a thin film layer 1 and an adhesive layer 2 coated on the thin film layer 1, wherein the thickness of the thin film layer is 120 micrometers, the thickness of the adhesive layer is 0.025mm, and the adhesive layer 2 comprises the following components in percentage by weight: 95 parts of matrix resin, 5 parts of tackifying resin, 50 parts of flame retardant, 0.05 part of coupling agent, 5 parts of curing agent, 0.1 part of curing accelerator and 20 parts of solvent.

Comparative example 2: the insulating adhesive film of the power battery side plate comprises a thin film layer 1 and an adhesive layer 2 coated on the thin film layer 1, wherein the thickness of the thin film layer is 100 micrometers, the thickness of the adhesive layer is 0.035mm, and the adhesive layer 2 comprises the following components in percentage by weight: 100 parts of matrix resin, 50 parts of flame retardant, 0.05 part of coupling agent, 5 parts of curing agent, 0.1 part of curing accelerator and 20 parts of solvent.

Comparative example 3: the power battery side plate insulating adhesive film comprises a thin film layer 1 and an adhesive layer 2 coated on the thin film layer 1, wherein the thickness of the thin film layer is 150 micrometers, the thickness of the adhesive layer is 0.030mm, and the adhesive layer 2 comprises the following components in percentage by weight: 100 parts of tackifying resin, 50 parts of flame retardant, 0.05 part of coupling agent, 5 parts of curing agent, 0.1 part of curing accelerator and 20 parts of solvent.

Comparative example 4: the power battery side plate insulating adhesive film comprises a thin film layer 1 and an adhesive layer 2 coated on the thin film layer 1, wherein the thickness of the thin film layer is 150 micrometers, the thickness of the adhesive layer is 0.030mm, and the adhesive layer 2 comprises the following components in percentage by weight: 60 parts of matrix resin, 40 parts of tackifying resin, 80 parts of flame retardant, 0.05 part of coupling agent, 5 parts of curing agent, 0.1 part of curing accelerator and 20 parts of solvent.

The performance of the insulating adhesive films of examples 1 to 5 and comparative examples 1 to 3 was measured:

1. the detection method comprises the following steps:

(1) thickness of

Measuring the thickness of the polyester film layer and the adhesive layer by using a micrometer, measuring the thickness of each layer by using a section slicing method and then under a high-multiple-code microscope;

(2) adhesive Strength (N/mm)

The insulation film was cut into 25mm wide sample strips of 25mm x 125mm in size, laminated and pressed at high temperature to room temperature of 25 ℃ for 30 minutes, and then the adhesion strength between the insulation film and the aluminum plate was measured in units of N/mm according to the standard at an angle of 180 ° and a peeling speed of 100 mm/min. AGS-J, a Nippon Shimadzu Universal tensile machine.

(3) Flame retardancy

The coated insulating film was baked at a high temperature of 170 ℃//20 minutes, cooled to room temperature, sampled at a size of 250mm in length by 50mm in width, and burned according to UL94 standard. And judging the flame retardant grade according to the standard.

2. The result of the detection

TABLE 1 Performance test results for insulating adhesive films

Evaluation of adhesion Effect

Very good: the comprehensive performance is optimal; o: the performance OK is expressed, and the use requirement can be met;

and (delta): indicating poor performance; x: indicating very poor performance.

The detection data show that the insulating adhesive film prepared by the invention has good bonding strength and bonding effect under low pressure of 0.2 MPa-1 MPa and short hot pressing time of 300 s-900 s, and has high bonding strength and excellent flame retardant property.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.