KR20190007856A - Battery pack of electric vehicle Hardening jig for duct bonding - Google Patents

Abstract

The present invention relates to a hardening jig for adhesion of a battery pack duct of an electric vehicle and, more specifically, to a hardening jig for adhesion of a battery pack duct of an electric vehicle, capable of shortening a curing time when curing a two-piece type electric vehicle battery pack duct and ensuring stable adhesion while satisfying a requirement of a fire burning test, which is one of the requirements of GBT31467.3 certified in China.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack for an electric vehicle,

The present invention relates to a curing jig for bonding a battery pack duct of an electric vehicle, and more particularly, to a curing jig for bonding a battery pack to a two-piece type electric appliance, which satisfies the fire burning test requirement of GBT31467.3, The present invention relates to a curing jig for bonding a battery pack duct of an electric vehicle, which is capable of shortening a curing time when curing a battery pack duct for an automobile and guiding stable adhesion.

Demand for electric vehicles is increasing worldwide, and China is growing rapidly, supported by full support from the national level, and is the largest market.

As the electric vehicle market grows, the demands of consumers increase as well, and the automakers in each country are striving to reflect these consumer requirements. One of the main requirements is fuel efficiency improvement.

In particular, in the case of electric vehicles (HEV, PHEV, EV, hydrogen fuel cell vehicle, etc.), research and investment are concentrated on many aspects such as weight saving of the vehicle and increase of the battery capacity.

In order to reduce the weight of electric vehicles, attempts have been actively made to apply lightweight materials to individual parts.

Nonetheless, it is one of the other important conditions in the Chinese market. It is possible to sell a vehicle only if the product satisfies the combustion test, especially the self-extinguishing performance test.

The Chinese certification standard related to this combustion test is GBT31467.3 (Lithium-ion Traction Battery Pack and System for electric vehicles safety requirements and test methods) It is stipulated that the battery cells should not explode when they are directly or indirectly heated for about 130 seconds in the form of direct heating for 60 seconds after indirect heating for 60 seconds and self-extinguishing (self-extinguishing) within 2 minutes It is one standard.

In addition, ECE R-100 is defined for similar certification standards in Europe.

Steel or aluminum has a very high melting point, so it is not a problem in the above certification standards, but it is relatively higher than synthetic resin (plastic) in terms of weight and cost, There is a problem with the satisfaction of the certification standard.

At this time, both the thermoplastic resin and the thermosetting resin can be used as the synthetic resin, but since the thermoplastic resin is melted in the flame of about 700 ° C, the self-extinguishing property is not available and the required performance can not be satisfied. In particular, SMC (unsaturated polyester containing glass fiber) has excellent dimensional stability and low specific gravity compared with steel, so it is widely regarded as a cover material for protecting the inside of battery pack. However, In order to have self-extinguishing ability within 2 minutes, it is necessary to contain a large amount of flame retardant, which causes a rise in the price, and thus it is in a state of limiting the competitiveness.

In order to solve this problem, the present applicant has developed a thermosetting resin composition for a battery pack for an electric vehicle and filed a patent application (Application No. 10-2016-0172465).

On the other hand, a duct used in a battery pack can be formed by one step molding through blow molding when molding with a thermoplastic resin, but since the thermoplastic resin melts quickly in a high temperature flame, It has the disadvantage of not being able to prevent entry.

Therefore, the thermosetting resin can be self-extinguishing property when it is molded by the thermosetting composition developed by the applicant of the present invention. However, since the blow molding, which is a one-step molding, is impossible, the thermosetting resin has a structure that is divided and formed by two- .

By the way, the adhesive is divided into a structural and a watertight, and the structural strength is excellent in the bonding strength, but the curing time is short and the workability is poor. For watertightness, the bonding strength is relatively lower than the structural strength.

However, when watertight applications are used, the curing time is too long (more than 5 minutes), which is problematic because the production capacity of 30,000 units per year can not be met.

Korean Patent Publication No. 10-2016-0041311 (Apr. 18, 2016) " Battery pack including fire-resistant safety member " Korean Patent Registration No. 10-1223032 (Oct. 31, 2013) "Composition for inner shell and inner shell for manufacturing electrode active material of secondary battery containing silicon carbide" Korean Patent Registration No. 10-1396034 (Apr. 2014, 2014.) 'Flame retardant and chemical resistant thermoplastic polycarbonate composition'

The present invention has been made in view of the above-described problems in the prior art, and it is an object of the present invention to provide a two-piece type semiconductor device which satisfies the requirements of the fire burning test, one of the requirements of GBT31467.3, There is provided a curing jig for adhering a battery pack duct of an electric vehicle, which is capable of shortening a curing time when curing a battery pack duct for an electric vehicle and capable of stably bonding.

The present invention provides a device for achieving the above object, comprising: a chamber for providing a sealed space for curing a cemented object (P), which is a duct for a two-piece battery pack to which an adhesive is applied, in 5 minutes; And a heating source installed in the chamber to uniformly heat the inside of the chamber to a temperature of 60-70 ° C.

In addition, the present invention is characterized by comprising a fixing frame 400 as a support; A heating chamber 410 provided on the upper surface of the stationary frame 400 in a state where the lower surface is opened in a rectangular box shape and one side surface and a surface opposite thereto are open; An inner sliding guide 430 installed at an open lower end of the heating chamber 410; An outer sliding guide 440 installed outside the heating chamber 410 in parallel with the inner sliding guide 430; A slider 450 seated on the external sliding guide 440; A plurality of clamps 460 mounted on the slider 450 to fix two pieces of the shaped pellets P bonded in a state of being coated with an adhesive so as not to flow; And a heating source (470) provided on the inner ceiling of the heating chamber (410).

At this time, a temperature sensor is further provided inside the heating chamber 410 to control the heating source 470 to uniformly heat the inside of the heating chamber 410 to a temperature of 60-70 ° C .

The heating source 470 is also characterized by a hot air or an infrared lamp.

Further, the screen 420 is further provided with openings on both sides of the heating chamber 410 so as to be slidably opened and closed in the vertical direction to seal the heating chamber 410.

According to the present invention, the curing time can be shortened when the battery pack duct for a two-piece type electric vehicle is cured while satisfying the requirement of the fire burning test, which is one of the requirements of GBT31467.3, An effect of enabling stable adhesion can be obtained.

FIG. 1 is an exemplary view showing a test example of a Chinese certification standard GBT31467.3 related to a battery module for an electric vehicle.
FIG. 2 is an enlarged fragmentary view showing a battery pack duct assembly structure for an electric vehicle using the thermosetting resin according to the present invention.
3 is an exemplary view of a curing jig according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Before describing the present invention, the following specific structural or functional descriptions are merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms, And should not be construed as limited to the embodiments described herein.

In addition, since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

In the present invention, even if the two-piece battery pack duct formed by using the thermosetting resin composition developed by the applicant of the present invention is adhered by the adhesive for watertight sealing, it is hardened at a specific temperature and shortened to 1/2 or more than the existing curing time, And a hardening jig capable of sufficiently achieving mass production capability.

At this time, the thermosetting resin composition for molding the battery pack duct comprises 17-20 wt% of an unsaturated polyester resin; 13-15% by weight of any one selected from among styrene-butadiene-styrene (SBS), polystyrene (PS), polyvinyl acetate (PVAc), polymethylmethacrylate (PMMA), polyethylene (PE) and PS / PVAc copolymer; 15 to 20% by weight of calcium carbonate as a filler; 1-3 wt% KYOWMAG (Magnesium Oxide) as thickener; 4-25 wt% of any one flame retardant selected from aluminum hydroxide (ATH), phosphorus / nitrogen compound compound, DBDPE (deca bromodiphenyl ethane) and antimony trioxide; 0.5 to 1% by weight of zinc stearate as a release agent and TBPB (T-Butyl-peroxy Benzoate) or TBIC (TriButyl Isopropyl Mono Peroxy Carbonate) as a curing agent and the balance glass fiber.

Here, the unsaturated polyester resin is advantageous in that it can be molded at room temperature depending on the application even if only a catalyst and an accelerator are added to the liquid resin, and has a merit that the specific gravity is small and weight can be reduced. It is advantageous in that it is comparable to a metal material by weight, and further has excellent heat resistance.

The filler is a kind of inorganic filler added to reinforce mechanical strength and to enhance heat resistance.

In addition, the thickener is added to control the viscoelasticity adjusting agent, that is, the viscosity. The flame retardant is the most important component in the present invention and is intended to increase the self-extinguishing ability while using a small amount.

The releasing agent is intended to improve releasability after molding, the curing agent is to promote curing, and the glass fiber is to enhance self-extinguishing property through penetration bonding of the flame retardant materials.

On the other hand, the duct is made of two pieces, and one side has a groove structure in which a mating member can be fitted, and the other side has a projection structure that fits in the groove. The adhesive is applied to the groove structure, And have mutually fixed structures.

For example, as shown in FIG. 2, the duct is divided into a first duct 100 and a second duct 200, and an insertion guide 210 having a groove on a coupling surface of the second duct 200 .

An insertion protrusion 110 is formed on a corresponding surface of the first duct 100.

When the adhesive 300 is applied to the groove of the insertion guide 210 and then the insertion hole 110 is inserted into the groove of the insertion guide 210, the insertion protrusion 110 is not inserted easily, so that the fixing stability is improved. The adhesive does not flow down during application and even when the structure is complicated, the coated state can be maintained accurately, and uniform fixing force can be maintained without causing nonuniform adhesive force across the entire shape.

In particular, the groove formed by the insertion guide 210 is preferably a U-shaped channel.

Since such a channel is capable of foaming processing, it is a method of press molding after roping when a thermosetting resin is formed, so that the most suitable assembly shape is provided in the present invention.

In addition, a stopper 120 is formed at one side of the insertion protrusion 110 of the first duct 100 at a right angle to increase the coupling stability and to increase the mold composition of the first and second ducts 100 and 200 desirable.

The stopper 120 is brought into surface contact with one side surface of the insertion guide 210 to perform an insertion depth limiting function in accordance with the contact so as to excessively push the adhesive 300 to prevent the adhesive 300 from escaping to the outside, .

In addition, the support surface through the surface contact is formed, so that the two pieces are assembled and the shape synthesis is improved.

The present invention is characterized in that the curing time of the adhesive used in the two-piece assembly structure of such a duct is effectively shortened so that the mass production capability can be obtained.

According to the study by the present inventor, it has been confirmed through trial and error that the conventional hardening time is reduced to 1/2 when the water-tight adhesive commonly used in the related art is heated at a constant temperature of 60 to 70 캜.

It should be noted that, in order to accelerate the curing, when the temperature exceeds 70 ° C, localized carbonization occurs and the adhesion function becomes poor. If the temperature is kept below 60 ° C, the curing time shortening effect can not be obtained.

In particular, a hot air or infrared lamp should be used as a heat source to heat the surface to which the workpiece is applied while maintaining such temperature conditions uniformly.

In addition, a heating chamber that can be maintained at a uniform temperature must be provided.

To this end, the present invention provides a curing jig as illustrated in Fig.

3, the curing jig according to the present invention includes a fixing frame 400. As shown in FIG.

The fixed frame 400 is a movable support.

A heating chamber 410 is installed on the upper surface of the fixed frame 400.

At this time, the heating chamber 410 has a rectangular box shape with a lower surface opened, and has a structure in which a side surface and a surface opposite to the side surface are kept open.

The screen 420 is slidably opened and closed by a combination of a motor and a ball screw on both open sides of the heating chamber 410.

In this case, the screen 420 maintains temperature uniformity by preventing heat loss when the inside of the heating chamber 410 is heated to a predetermined temperature.

An inner sliding guide 430 is installed at the lower end of the heating chamber 410 and an outer sliding guide 440 is installed at the outer side of the heating chamber 410 in parallel with the inner sliding guide 430. do.

Further, a slider 450 is seated on the external sliding guide 440.

Accordingly, the slider 450 may slide along the outer sliding guide 440 and move to the upper portion of the inner sliding guide 430.

Particularly, the slider 450 is provided with a plurality of clamps 460, so that the two-piece bonded cargo P bonded with the adhesive can be stably fixed without flowing.

A heating source 470 is installed on the inner surface of the heating chamber 410.

In this case, a preferable heating source 470 is hot air or an infrared lamp.

The driving of the heating source 470, the clamp 460 and the slider 450 and the operation of the screen 420 are designed to be controlled through the PLC as an industrial controller.

The present invention having such a configuration has the following operational relationship.

A fixed object P to which two pieces are bonded under the presence of an adhesive but is in an uncured state is placed on the slider 450 and fixed firmly using a clamp 460. [

Then, the slider 450 moves and stops on the inner sliding guide 430.

Then, the screen 420 is lowered to keep the heating chamber 410 in a closed state, and the inside of the heating chamber 410 is maintained at a predetermined temperature, preferably 60-70 ° C, while the heating source 470 is driven.

At this time, a temperature sensor may be further installed in the heating chamber 410 to maintain temperature uniformity.

By doing so, the adhesive can be cured within 5 minutes, minimizing the process cycle time.

As described above, the curing time of the conventional adhesive can be shortened to 5 minutes or less through the curing jig, thereby maximizing the working efficiency.

100: first duct 110: insertion projection
120: Stopper 200: Second duct
210: insertion guide 300: adhesive

Claims (5)

A chamber for providing an airtight space for curing the pellets (P), which is a duct for a two-packed battery pack bonded with an adhesive applied thereto, within 5 minutes;
And a heating source installed in the chamber to uniformly heat the inside of the chamber to a temperature of 60-70 ° C.
A fixing frame 400 as a support chain;
A heating chamber 410 provided on the upper surface of the stationary frame 400 in a state where the lower surface is opened in a rectangular box shape and one side surface and a surface opposite thereto are open;
An inner sliding guide 430 installed at an open lower end of the heating chamber 410;
An outer sliding guide 440 installed outside the heating chamber 410 in parallel with the inner sliding guide 430;
A slider 450 seated on the external sliding guide 440;
A plurality of clamps 460 mounted on the slider 450 to fix two pieces of the shaped pellets P bonded in a state of being coated with an adhesive so as not to flow;
And a heating source (470) provided on the inner ceiling of the heating chamber (410).
The method of claim 2,
A temperature sensor is additionally provided in the heating chamber 410 to control the heating source 470 to uniformly heat the inside of the heating chamber 410 to a temperature of 60-70 ° C. Curing jig for pack duct bonding.
The method of claim 2,
Wherein the heating source (470) is a hot air or infrared lamp.
The method of claim 2,
Wherein a screen (420) is installed on both open sides of the heating chamber (410) so as to open and close the heating chamber (410) in a vertical direction to seal the heating chamber (410).

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