CN110684358A - Filling, foaming, potting and sealing silica gel for new energy power battery, preparation method and application - Google Patents

Abstract

The invention discloses filling foaming encapsulating silica gel for a new energy power battery, which is prepared from the following raw materials: 25-35% by mass of vinyl silicone oil; 5-15% of alpha, w-dihydroxy polydimethylsiloxane; 12.5-15% by mass of a cross-linking agent; 5-7.5% by mass of aluminum hydroxide; 20-30% of flame retardant powder by mass fraction; 10-15% mass fraction of antimony hydroxide; 0.5-0.7% by mass of a treating agent; 0.1-0.18% by mass of a time delay agent; 0.2-0.6% by mass of a catalyst; 0.1-0.18% by mass of ethynl cyclohexanol; 0.1-0.15% by mass of a dye filler. In the glue-impregnated paper battery pack made of the material, all the space in the battery pack can be well filled. Meanwhile, the obtained filling foaming encapsulation silica gel of the new energy power battery has excellent performance.

Description

Filling, foaming, potting and sealing silica gel for new energy power battery, preparation method and application

technical field

The invention relates to the technical field of new energy power batteries, in particular to a filling, foaming, potting and sealing silica gel for new energy power batteries, a preparation method and applications.

Background technique

Power battery new energy vehicles are based on the principle of converting electrical energy provided by batteries into mechanical energy to achieve clean and environmentally friendly transportation, so there are high requirements for hard indicators such as battery storage, rapid charge and discharge, and energy density. performance, long life and other necessary use requirements.

In practice, the electrodes of the battery are easy to be short-circuited by moisture, the electrodes are easy to loosen and disconnect when the car is bumped, and the discharge current is large. These factors are easy to cause thermal runaway and fire. For the above reasons, the battery must realize temperature management, heating at low temperature, and heat dissipation at high temperature. There are special requirements for the selection of materials: it must be fireproof V0, excellent electrical performance, high and low temperature weather resistance, etc., and long service life.

In order to meet the insulation effect of heat insulation and shock absorption, and to meet the requirements of battery production and assembly, the battery industry now uses foamed rubber sheets to laminate polyacrylic acid, but polyacrylic acid has a temperature resistance of less than 120 ° C, so it is easy to crack and fall off. At the same time, most of the space inside the battery cannot be fitted.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a new energy power battery with excellent comprehensive performance such as heat insulation, shock absorption, moisture resistance, fire prevention, etc., which can solve the problem of filling, foaming, potting and sealing silica gel, and a glue-filling process, and solves the foaming process of traditional technology. Most of the space inside the battery cannot be filled completely by the glue and the weather resistance problem.

The present invention provides a filling, foaming, potting and sealing silica gel for a new energy power battery, which is prepared from the following raw materials:

25%-35% mass fraction of vinyl silicone oil;

5%-15% mass fraction of a,w-dihydroxy polydimethylsiloxane;

12.5%-15% mass fraction of cross-linking agent;

5%-7.5% mass fraction of aluminum hydroxide;

20%-30% mass fraction of flame retardant powder;

10%-15% mass fraction of antimony hydroxide;

0.5%-0.7% mass fraction of treatment agent;

0.1%-0.18% mass fraction of delay agent;

0.2%-0.6% mass fraction of catalyst;

0.1%-0.18% mass fraction of acetylene cyclohexanol;

0.1%-0.15% mass fraction of dyeing fillers.

Further, the vinyl silicone oil is selected from one or more of viscosities of 5,000, 10,000 and 20,000.

Further, the a,w-dihydroxy polydimethylsiloxane is selected from one or more of viscosities of 5000, 10000 and 20000.

Further, the crosslinking agent is selected from one or more of the hydrogen-containing silicone oil whose molar hydrogen content is 0.4%, 0.8%, and 1.6%.

Further, the flame retardant powder filler is selected from one or more of aluminum hydroxide, antimony hydroxide and nitrogen and phosphorus flame retardant powder.

Further, the treatment agent is selected from one or more of alkylsilane, n-decyltrimethoxysilane, dodecyltrimethoxysilane and hexadecyltrimethoxysilane.

Further, the catalyst is selected from platinum catalyst.

The present invention also provides a method for preparing the above-mentioned filling, foaming, potting and sealing silica gel for a new energy power battery, which comprises the following steps:

Mix vinyl silicone oil with a,w-dihydroxy polydimethylsiloxane, stir and mix for 30-50min to obtain foamed silica gel base;

Take the base material, add nitrogen-phosphorus flame retardant powder, aluminum hydroxide and antimony hydroxide, stir and mix for 30-50min, and then add a treatment agent to process the filler to obtain a flame-retardant foamed silica gel base material;

Take the flame-retardant foamed silica gel base material and add hydrogen-containing silicone oil, color paste and acetylene cyclohexanol to obtain the flame-retardant foamed silica gel base material A component;

The flame-retardant foamed silica gel base material is taken and a platinum catalyst is added to obtain the B component of the flame-retardant foamed silica gel base material.

Further, mixing 25%-35% mass fraction of vinyl silicone oil with 5%-15% mass fraction a,w-dihydroxy polydimethylsiloxane, and stirring and mixing for 30-50min to obtain a foamed silica gel base ;

Then add 5%-7.5% mass fraction of aluminum hydroxide, 20%-30% mass fraction of flame retardant powder, 10%-15% mass fraction of antimony hydroxide, stir and mix for 30-50min and add 0.5%-0.7% The filler is treated with a mass fraction of the treating agent to obtain a flame retardant foamed silica gel base material;

Add 12.5% mass fraction of 1.6% hydrogen-containing silicone oil, 0.18% mass fraction of acetylene cyclohexanol, and 0.1%-0.15% mass fraction of black dyed fillers to the flame-retardant foamed silica gel base material; obtain flame-retardant foamed silica gel group A Minute;

The flame-retardant foamed silica gel base material is taken and added with a catalyst in a mass fraction of 0.2% to 0.6% to obtain the B component of the flame-retardant foamed silica gel.

The invention also provides an application of filling, foaming, potting and sealing silica gel for a new energy power battery, and applying the A component and the B component obtained above to the gap of the battery pack according to a set ratio.

The filling, foaming, potting and sealing silica gel for a new energy power battery disclosed by the invention and the glue filling process can well fill the entire space in the battery pack in the glue-filled paper battery pack. At the same time, the filled, foamed and potted silica gel for the new energy power battery has excellent tensile strength, elongation, water absorption, combustion flame spread index, combustion smoke concentration, volume resistivity, flame retardancy, and thermal conductivity.

Description of drawings

Fig. 1 is a schematic diagram of stirring A component/B component according to the present invention.

Figure 2 is a schematic structural diagram of the present invention after stirring the A component/B component and filling.

FIG. 3 is a schematic structural diagram of a filled battery pack obtained by filling the filling, foaming, potting and sealing silica gel of the new energy power battery of the present invention and then baking.

Detailed ways

Below in conjunction with specific embodiment and description accompanying drawing, the present invention will be further elaborated and described:

The raw materials involved in the present invention are all commercially available.

The preparation method of filling, foaming, potting and sealing silica gel for new energy power battery is as follows:

Step 1, mixing vinyl silicone oil and a,w-dihydroxy polydimethylsiloxane, stirring and mixing for 30-50min to obtain foamed silica gel base;

Step 2, take the base material and add nitrogen-phosphorus flame retardant powder, aluminum hydroxide and antimony hydroxide, stir and mix for 30-50min, add a treatment agent to process the filler to obtain a flame-retardant foamed silica gel base material;

Step 3, take the flame retardant foamed silica gel base material and add hydrogen-containing silicone oil, color paste and acetylene cyclohexanol to obtain component A of the flame retardant foamed silica gel base material;

Step 4, take the flame-retardant foamed silica gel base material and add platinum catalyst to obtain the B component of the flame-retardant foamed silica gel base material.

Specifically, in some embodiments, the steps are as follows:

Mix vinyl silicone oil with a,w-dihydroxy polydimethylsiloxane, stir and mix for 30-50min to obtain foamed silica gel base;

Then add 5%-7.5% mass fraction of aluminum hydroxide, 20%-30% mass fraction of flame retardant powder, 10%-15% mass fraction of antimony hydroxide, stir and mix for 30-50min and add 0.5%-0.7% The filler is treated with a mass fraction of the treating agent to obtain a flame retardant foamed silica gel base material;

Add 12.5% mass fraction of 1.6% hydrogen-containing silicone oil, 0.18% mass fraction of acetylene cyclohexanol, and 0.1%-0.15% mass fraction of black dyeing fillers to the flame-retardant foamed silica gel base material; obtain flame-retardant foamed silica gel group A Minute;

Take the flame-retardant foamed silica gel base material and add a catalyst with a mass fraction of 0.2% to 0.6% to obtain the B component of the flame-retardant foamed silica gel;

The A and B components are then mixed in proportions.

Among them, a,w-dihydroxypolydimethylsiloxane is the basic material of silicone rubber, and the molecular structure is a hydroxyl-terminated linear silicone oil.

The function of the cross-linking agent is to link the above-mentioned basic materials into a 3-dimensional network structure through the cross-linking agent.

The role of aluminum hydroxide is mainly to strengthen the mechanical tensile and tear strength of the colloidal structure.

The function of the flame retardant powder is to make the fireproof grade of the colloid reach UL94-V0.

The function of antimony hydroxide is to make the fireproof grade of the colloid reach UL94-V0.

The function of the delay agent is to delay the reaction speed of the foamed colloid, so that the production is easy to control.

The role of the catalyst is to enable the blowing agent to rapidly stabilize and reduce chemical reactions.

Example 1

Taking a filling, foaming, potting and sealing silicone formulation for new energy power batteries as an example, 35% mass fraction of 20000cps vinyl silicone oil and 5% mass fraction of 20000cps a,w-dihydroxy polydimethylsiloxane were used as an example. Oxane, stirred and mixed for 30-50min to obtain foamed silica gel base; then 5% mass fraction of aluminum hydroxide, 26.57% mass fraction of nitrogen-phosphorus flame retardant powder, 15% mass fraction of antimony hydroxide, stirred and mixed for 30 -After 50min, 0.7% hexadecyltrimethoxysilane was added to process the filler to obtain a flame retardant foamed silica gel base;

Component A: take 500 grams of flame-retardant foamed silica gel base material, add 62.5 grams of 1.6% hydrogen-containing silicone oil, 0.9 grams of acetylene cyclohexanol, and 0.75 grams of black dyeing filler; Foam silica gel A component;

Component B: take 500 grams of flame-retardant foamed silica gel base material, and add 3 grams of platinum catalyst (5000 ppm). The B component of the flame-retardant foamed silica gel is obtained.

The performance of curing after mixing A and B evenly is as follows:

serial number Test items unit Test standard Technical indicators 1 Exterior / / assorted 2 density g.cm3 ASTM D1056 0.5±0.05 3 Compressive stress, 25% kpa ASTM D1056 110±11 4 Compression set % ASTM D1056 ≤5.0 5 Tensile Strength Mpa GB/T 528-2009 ≥0.4 6 Elongation % GB/T 528-2009 ≥100 7 water absorption % ASTM D570 ≤5.0 8 Environmental testing / ROHS qualified 9 Burning flame spread index / ASTM E162 qualified 10 combustion smoke concentration / ASTM E 662-2015 qualified 11 Burning toxic gas emissions / SMP 800-C-2009 qualified 12 low temperature bending / ASTM D1056 -55℃ qualified 13 Dielectric strength Kv/mm GB/T 1695-2005 ≥3.5 14 Volume resistivity Ω.cm GB/T 1695-2005 ≥1.0*10¹⁵ 15 flame retardancy / UL94-2013 V-0 16 Thermal conductivity W/(M.K) ASTM D5930 0.09

Example 2

Taking a filling, foaming and potting silicone formulation for new energy power batteries as an example, 30% mass fraction of 20000cps vinyl silicone oil and 10% mass fraction of 20000cps a,w-dihydroxy polydimethylsiloxane were used as an example. , stir and mix for 30-50min to obtain a foamed silica gel base; then add 5% mass fraction of aluminum hydroxide, 26.57% mass fraction of nitrogen-phosphorus flame retardant powder, 15% mass fraction of antimony hydroxide, stir and mix for 30-50min Then add 0.7% mass fraction of hexadecyltrimethoxysilane to process the filler to obtain flame-retardant foamed silica gel base material;

Component A: Take 500 grams of flame-retardant foamed silica gel base material, add 62.5 grams of 1.6% hydrogen-containing silicone oil, 0.9 grams of acetylene cyclohexanol, and 0.75 grams of black dyeing filler; obtain flame-retardant foamed silica gel group A Minute;

Component B: Take 500 grams of flame-retardant foamed silica gel base material, and add 3 grams of platinum catalyst (5000ppm). The B component of the flame-retardant foamed silica gel is obtained.

The properties of curing after mixing A and B evenly are as follows:

Example 3

Mix 25% of 20000cps vinyl silicone oil and 15% of 20000cps a,w-dihydroxy polydimethylsiloxane, stir and mix for 30-50min to obtain a foamed silica gel base; then add 5% of aluminum hydroxide, 26.57 % nitrogen-phosphorus flame retardant powder, 15% antimony hydroxide, stir and mix for 30-50 minutes, and then add 0.7% hexadecyltrimethoxysilane to process the filler to obtain a flame-retardant foamed silica gel base material.

Component A: take 1000 grams of flame-retardant foamed silica gel base material, add 125 grams of 1.6% hydrogen-containing silicone oil, 1.8 grams of acetylene cyclohexanol, and 1.5 grams of black dyeing filler; obtain flame-retardant foamed silica gel group A point.

Component B: take 1000 grams of flame retardant foamed silica gel base material, add 6 grams of platinum catalyst (5000ppm). The B component of the flame-retardant foamed silica gel is obtained.

The properties of curing after mixing A and B evenly are as follows:

serial number Test items unit Test standard Technical indicators 1 Exterior / / assorted 2 density g.cm3 ASTM D1056 0.2±0.02 3 Compressive stress, 25% kpa ASTM D1056 10±3 4 Compression set % ASTM D1056 ≤5.0 5 Tensile Strength Mpa GB/T 528-2009 ≥0.3 6 Elongation % GB/T 528-2009 ≥90 7 water absorption % ASTM D570 ≤5.0 8 Environmental testing / ROHS qualified 9 Burning flame spread index / ASTM E162 qualified 10 combustion smoke concentration / ASTM E 662-2015 qualified 11 Burning toxic gas emissions / SMP 800-C-2009 qualified 12 low temperature bending / ASTM D1056 -55℃ qualified 13 Dielectric strength Kv/mm GB/T 1695-2005 ≥2.0 14 Volume resistivity Ω.cm GB/T 1695-2005 ≥1.0*10¹⁵ 15 flame retardancy / UL94-2013 V-0 16 Thermal conductivity W/(M.K) ASTM D5930 0.06

The invention also provides an application of filling, foaming, potting and sealing silica gel for a new energy power battery.

As shown in Figure 1, the A/B components obtained above are stirred at a ratio of 1:1 and then poured into the interstitial space of the battery pack. As shown in Figure 2, the filled battery pack is baked, foamed, and formed, as shown in Figure 3. It can be seen from Figure 3 that the gap of the battery pack is filled with silica gel.

The filling, foaming, potting and sealing silica gel for the new energy power battery disclosed by the invention and the glue filling process can well fill the space in the battery pack in the glue filling paper battery pack. At the same time, the filled, foamed and potted silica gel for the new energy power battery has excellent tensile strength, elongation, water absorption, combustion flame spread index, combustion smoke concentration, volume resistivity, flame retardancy, and thermal conductivity.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that , the technical solutions of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. A filling, foaming, potting and sealing silica gel for new energy power battery, characterized in that, it is prepared from the following raw materials: 25%-35% mass fraction of vinyl silicone oil; 5%-15% mass fraction of a,w-dihydroxy polydimethylsiloxane; 12.5%-15% mass fraction of cross-linking agent; 5%-7.5% mass fraction of aluminum hydroxide; 20%-30% mass fraction of flame retardant powder; 10%-15% mass fraction of antimony hydroxide; 0.5%-0.7% mass fraction of treatment agent; 0.1%-0.18% mass fraction of delay agent; 0.2%-0.6% mass fraction of catalyst; 0.1%-0.18% mass fraction of acetylene cyclohexanol; 0.1%-0.15% mass fraction of dyeing fillers. 2 . The filling, foaming, potting and sealing silica gel for a new energy power battery according to claim 1 , wherein the vinyl silicone oil is selected from one or more of viscosities of 5,000, 10,000 and 20,000. 3 . 3. The filling, foaming, potting and sealing silica gel for new energy power batteries according to claim 1, wherein the a,w-dihydroxy polydimethylsiloxane is selected from the group whose viscosity is 5000, 10000, One or more of 20000. 4. The filling, foaming, potting and sealing silica gel used for a new energy power battery according to claim 1, characterized in that: the molar hydrogen content of the hydrogen-containing silicone oil selected as the crosslinking agent is 0.4%, 0.8%, and 1.6%. one or more of them. 5. The filling, foaming, potting and sealing silica gel used for a new energy power battery according to claim 1, wherein the flame-retardant powder filler is selected from aluminum hydroxide, antimony hydroxide and nitrogen-phosphorus flame-retardant powder. one or more. 6. The filling, foaming, potting and sealing silica gel for new energy power batteries according to claim 1, wherein the treatment agent is selected from alkyl silane, n-decyl trimethoxy silane, dodecyl trimethoxy silane One or more of hexadecyl trimethoxy silane and hexadecyl trimethoxy silane. 7 . The filling, foaming, potting and sealing silica gel for a new energy power battery according to claim 1 , wherein the catalyst is a platinum catalyst. 8 . 8. A preparation method for the filling, foaming, potting and sealing silica gel of a new energy power battery according to any one of claims 1-7, characterized in that, comprising the following steps: Mix vinyl silicone oil with a,w-dihydroxy polydimethylsiloxane, stir and mix for 30-50min to obtain foamed silica gel base; Take the base material, add nitrogen-phosphorus flame retardant powder, aluminum hydroxide and antimony hydroxide, stir and mix for 30-50min, and then add a treatment agent to process the filler to obtain a flame-retardant foamed silica gel base material; Take the flame-retardant foamed silica gel base material and add hydrogen-containing silicone oil, color paste and acetylene cyclohexanol to obtain the flame-retardant foamed silica gel base material A component; The flame-retardant foamed silica gel base material is taken and a platinum catalyst is added to obtain the B component of the flame-retardant foamed silica gel base material. 9. The preparation method of the filling, foaming, potting and sealing silica gel of a new energy power battery as claimed in claim 8, characterized in that, Mix 25%-35% mass fraction of vinyl silicone oil with 5%-15% mass fraction a,w-dihydroxy polydimethylsiloxane, stir and mix for 30-50min to obtain foamed silica gel base; Then add 5%-7.5% mass fraction of aluminum hydroxide, 20%-30% mass fraction of flame retardant powder, 10%-15% mass fraction of antimony hydroxide, stir and mix for 30-50min and add 0.5%-0.7% The filler is treated with a mass fraction of the treating agent to obtain a flame retardant foamed silica gel base material; Add 12.5% mass fraction of 1.6% hydrogen-containing silicone oil, 0.18% mass fraction of acetylene cyclohexanol, and 0.1%-0.15% mass fraction of black dyeing fillers to the flame-retardant foamed silica gel base material; obtain flame-retardant foamed silica gel group A Minute; The flame-retardant foamed silica gel base material is taken and added with a catalyst in a mass fraction of 0.2% to 0.6% to obtain the B component of the flame-retardant foamed silica gel. 10. An application of filling, foaming, potting and sealing silica gel for a new energy power battery, characterized in that the A component and the B component according to claim 8 or 9 are applied to the gap of the battery pack according to a set ratio.

Images