JP2022094801A - LIB cooling plate and LIB cooling kit - Google Patents

Abstract

To provide a LIB cooling plate and a LIB cooling kit that is lightweight, can efficiently and uniformly cool the entire LIB, and has good thermal efficiency.SOLUTION: Provided is a box-shaped LIB cooling plate with open top with two opposite sides and bottom, the two facing sides are provided with a cooling solvent inlet for inflowing a cooling solvent and a cooling solvent outlet for allowing the cooling solvent to flow out, and the bottom surface has a plurality of ribs. In a projection drawing in an opposite direction, the ratio of the total width of the plurality of ribs to the width of the internal space of the LIB cooling plate is 0.4 to 0.98, and the bottom and the side contain resin.SELECTED DRAWING: None

Description

The present invention relates to a cooling plate for LIB (lithium ion battery) and a cooling kit for LIB including the cooling plate for LIB.

The LIB used in the power supply device for a vehicle can output a large current and generates heat during charging / discharging to raise the temperature. Therefore, a cooling system for the LIB may be provided.
As such a cooling system for LIB, a system having a flow path such as a cooling pipe through which a cooling solvent flows has been conventionally used (for example, Patent Documents 1 and 2).

International Publication No. 2020/02729 Japanese Unexamined Patent Publication No. 2009-134901

However, since the conventional cooling system as described in Patent Documents 1 and 2 has a structure in which the cooling solvent flows through a long flow path, the temperature of the cooling solvent becomes higher toward the downstream side of the flow path, and the LIB is cooled. There is a problem of spots on the surface. Further, if the entire system is made of metal as in the cooling system of Patent Document 1, the weight is heavy, the metal has high thermal conductivity, and heat escapes to the outside, so improvement in thermal efficiency is desired.

Therefore, an object of the present invention is to provide a cooling plate for LIB and a cooling kit for LIB, which are lightweight, can efficiently and uniformly cool the entire LIB, and have good thermal efficiency.

As a result of diligent studies to solve the problem, the present inventors decided to make a plate having a specific box shape with an inlet / outlet for a cooling solvent, having a plurality of specific ribs on the bottom surface, and containing resin on the bottom surface and the side surface. The present invention was completed by finding that the above problems could be solved.

That is, the present invention is as follows.
[1]
A box-shaped cooling plate for LIB with an open top surface having two opposite sides and a bottom surface.
The two facing surfaces are provided with a cooling solvent inlet for flowing in the cooling solvent and a cooling solvent outlet for flowing out the cooling solvent, respectively.
The bottom surface has a plurality of ribs and has a plurality of ribs.
In the projection drawing in the facing direction, the ratio of the total width of the plurality of ribs to the width of the internal space of the cooling plate for LIB is 0.4 to 0.98.
A cooling plate for LIB, wherein the bottom surface and the side surface contain a resin.
[2]
The LIB cooling according to [1], wherein the ratio of the average of the widths of the plurality of ribs to the width of the internal space of the LIB cooling plate is 0.05 to 0.3 in the projection drawing in the facing direction. plate.
[3]
The cooling plate for LIB according to [1] or [2], which has a plurality of rib rows composed of a plurality of ribs arranged in a direction perpendicular to the facing direction at a predetermined pitch in the facing direction.
[4]
The LIB cooling plate according to [3], wherein the ratio of the pitch to the width of the internal space of the LIB cooling plate in the projection drawing in the opposite direction is 0.01 to 0.43.
[5]
[1] to [1] to [1] to [1] to [1] to [1] to [1] to [1] to [1] to [1] to [1] to [1] to [1] to [1] to [1] to [1] to [1] to [1] to [1] to [1]-[ 4] The cooling plate for LIB according to any one of.
[6]
In a plan view with the cooling solvent inlet side on the left and the cooling solvent outlet side on the right, the straight line indicating the extending direction of the rib having the extending direction and the plan view shape has a positive inclination. When the angle θ is a positive angle and the straight line indicating the extending direction of the rib having the plan view shape having the extending direction has a negative inclination, the angle θ is a negative angle. The cooling plate for LIB according to [5], wherein the total of θ is −90 ° to 90 °.
[7]
The cooling plate for LIB according to any one of [1] to [6], wherein the bottom surface and the side surface are resin foams.
[8]
The cooling plate for LIB according to any one of [1] to [7], which has a groove portion capable of accommodating packing on the upper surface of the side surface.
[9]
A cooling kit for LIB, which comprises the cooling plate for LIB according to any one of [1] to [8], a metal plate, and packing.

According to the present invention, it is possible to provide a cooling plate for LIB and a cooling kit for LIB, which are lightweight, can efficiently and uniformly cool the entire LIB, and have good thermal efficiency.

It is a schematic diagram which shows an example of the cooling plate for LIB of this embodiment. (A) is a plan view, and (B) is a cross-sectional view when the cooling plate for LIB shown in (A) is cut by a plane along a line AA. It is a schematic sectional drawing which shows an example of the cooling kit for LIB of this embodiment.

Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described in detail. The present invention is not limited to the following embodiments, and can be variously modified and implemented within the scope of the gist thereof.

[Cooling plate for LIB]
The LIB cooling plate of the present embodiment is a box-shaped LIB cooling plate having an open top surface having two opposite side surfaces and a bottom surface, and has a cooling solvent inlet for flowing a cooling solvent into the two opposite side surfaces. The bottom surface has a plurality of ribs, respectively, and the internal space of the cooling plate for the LIB, which is the total width of the plurality of ribs in the projection view in the facing direction. The ratio to the width of the above is 0.4 to 0.98, and the bottom surface and the side surface thereof are characterized by containing a resin.
In the LIB cooling plate of the present embodiment, the cooling solvent in the LIB cooling plate is agitated by vibration caused by starting, stopping, accelerating and decelerating the vehicle body on which the LIB cooling plate is mounted. Further, since the cooling plate for LIB of the present embodiment has a box shape having no flow path that determines the flow of the cooling solvent and has a plurality of specific ribs on the bottom surface, the cooling solvent is used in the entire cooling plate for LIB. Is efficiently stirred, there is little temperature unevenness of the cooling solvent, and the entire LIB can be cooled uniformly and efficiently.

The cooling plate for LIB of the present embodiment has two opposite side surfaces and a bottom surface, and has a box shape with an open top surface.
The shape of the bottom surface is not particularly limited as long as it can form a box shape with two opposite sides and the top surface is open, and may be determined according to the shape of the LIB to be cooled. For example, polygons such as squares, rectangles, parallelograms, trapezoids, and hexagons may be mentioned, and the corners may be rounded. Further, the shape may include curved sides such as an oval (a shape in which both ends of a pair of parallel straight lines are connected by a semicircle).
The average thickness of the bottom surface is preferably 3 to 30 mm, more preferably 5 to 25 mm, and even more preferably 7 to 20 mm from the viewpoint of strength and heat insulating properties.

The shapes of the two opposite side surfaces are not particularly limited, and examples thereof include polygons such as squares, rectangles, parallelograms, and trapezoids, and the corners may be rounded. Further, it may be a curved surface. The shapes of the two facing surfaces may be the same or different, but are preferably the same.
Further, the shape of the side surface other than the two facing side surfaces is not particularly limited, and may be the same shape as the two facing side surfaces.
The average thickness of each side surface is preferably 3 to 30 mm, more preferably 5 to 25 mm, and even more preferably 7 to 20 mm from the viewpoint of strength and heat insulating properties.

The angle formed by each side surface and the bottom surface is not particularly limited, but is preferably 90 °.

The cooling plate for LIB of the present embodiment is provided with a cooling solvent inlet for flowing in the cooling solvent and a cooling solvent outlet for flowing out the cooling solvent on two opposite sides thereof.
The opening shapes of the cooling solvent inlet and the cooling solvent outlet are not particularly limited, and examples thereof include a circular shape, an elliptical shape, and a polygonal shape. The opening shape may be the same or different between the cooling solvent inlet and the cooling solvent outlet.

FIG. 1 is a schematic view showing an example of a cooling plate for LIB according to the present embodiment. 1A is a plan view, and FIG. 1B is a cross-sectional view when the LIB cooling plate shown in FIG. 1A is cut along a plane along a line AA. The cooling plate 1 for LIB in FIG. 1 is an example including a cooling solvent inlet 2 and a cooling solvent outlet 3 having a rectangular bottom surface and side surfaces and having a rectangular opening shape.
In FIG. 1, the facing direction of the two facing surfaces including the cooling solvent inlet 2 and the cooling solvent outlet 3 is the x-axis direction, the direction perpendicular to the facing direction is the y-axis direction, and the direction perpendicular to the xy plane is perpendicular to the plane. The direction is the z-axis direction.
Hereinafter, the cooling plate for LIB of the present embodiment will be further described with reference to FIG. 1.

On the side surface having the cooling solvent inlet, the ratio of the opening width of the cooling solvent inlet to the inner dimension width of the side surface is preferably 0.05 to 0.5, more preferably 0.07 to 0.4. Yes, more preferably 0.1 to 0.3. When the ratio of the opening width of the cooling solvent inlet is within the above range, it becomes easy to appropriately adjust the flow rate of the refrigerant, and it becomes easy to optimize the stirring efficiency.
When the opening width of the cooling solvent inlet is not constant (for example, when the opening shape is a circle, an ellipse, a trapezoid, etc.), the above ratio is obtained from the maximum value of the opening width.
The opening width and the inner dimension width of the side surface of the cooling solvent inlet correspond to the widths _aw and Y in the y-axis direction in FIG. 1A, respectively.

On the side surface having the cooling solvent outlet, the ratio of the opening width of the cooling solvent outlet to the inner dimension width of the side surface is preferably 0.05 to 0.5, more preferably 0.07 to 0.4. Yes, more preferably 0.1 to 0.3. When the ratio of the opening width of the cooling solvent inlet is in the above range, it becomes easy to appropriately adjust the flow rate of the refrigerant, and it becomes easy to optimize the stirring efficiency.
When the opening width of the cooling solvent outlet is not constant (for example, when the opening shape is a circle, an ellipse, a trapezoid, etc.), the above ratio shall be obtained from the maximum value of the opening width.
The opening width and the inner dimension width of the side surface of the cooling solvent outlet correspond to the widths b _w and Y in the y-axis direction in FIG. 1A, respectively.

It is preferable that the cooling plate for LIB of the present embodiment has a groove portion capable of accommodating packing on the upper surface of each side surface. By fixing the metal plate described later to the upper surface of the side surface of the cooling plate for LIB via the packing accommodated in the groove, a highly water-stopping structure can be formed.
The grooves are preferably formed on the upper surfaces of all the side surfaces of the cooling plate for LIB, and it is more preferable that they communicate with each other.
FIG. 1 shows an example of a cooling plate for LIB having grooves on the upper surfaces of all side surfaces and communicating with each other.

The cooling plate for LIB of this embodiment has a plurality of ribs on the bottom surface.
The plurality of ribs hinder the flow of the cooling solvent from the cooling solvent inlet side to the cooling solvent outlet side, so that the cooling solvent is efficiently agitated.

The three-dimensional shape of the rib is not particularly limited. Hemispherical shape and the like can be mentioned. Above all, a pillar shape is preferable because the stirring efficiency is good and cracks are not easily chipped.
The plan-viewing shape of the rib is not particularly limited, and examples thereof include a polygonal shape such as a triangle, a quadrangle, a pentagon, and a hexagon, a circular shape, and an elliptical shape. In the case of a polygonal shape, the corners may be rounded. Above all, a quadrangular or elliptical shape is preferable because of good stirring efficiency and ease of shaping.

The ratio of the total width of each rib to the width of the internal space of the cooling plate for LIB is 0.4 to 0.98, preferably 0, in the facing projection of the two facing sides of the rib. It is .45 to 0.95, more preferably 0.5 to 0.9. When the ratio of the total width of each rib is in the above range, the dispersion of the plurality of ribs in the direction perpendicular to the opposite direction is good, and the ribs are the cooling solvent from the cooling solvent inlet side to the cooling solvent outlet side. It becomes a good obstacle to the flow and the cooling solvent is efficiently agitated.
Further, in the projection drawing in the opposite direction, the ratio of the average width of each rib to the width of the internal space of the cooling plate for LIB is preferably 0.05 to 0.3, more preferably 0.07. It is ~ 0.28, more preferably 0.1 ~ 0.25. When the average ratio of the widths of the ribs is in the above range, each rib has a good obstacle to the flow of the cooling solvent from the cooling solvent inlet side to the cooling solvent outlet side (the obstacle is enough to cause the cooling solvent to stay). The cooling solvent tends to be agitated efficiently.
When the width of each of the ribs is not constant (for example, when the three-dimensional shape of the rib is a cone shape, a cone shape, etc.), the above ratio is calculated from the maximum value of the width of each rib.
The width of each rib and the width of the internal space correspond to the widths d _w1 and Y, respectively, in FIG. 1A.

Further, in the projection drawing in the opposite direction, the ratio of the average height of each rib to the height of the internal space of the cooling plate for LIB is preferably 0.1 to 0.8, and more preferably 0. It is .2 to 0.7, more preferably 0.3 to 0.6. When the average ratio of the heights of the ribs is in the above range, each rib has a good obstruction of the flow of the cooling solvent from the cooling solvent inlet side to the cooling solvent outlet side (obstacle enough to cause the cooling solvent to stay). The cooling solvent tends to be agitated efficiently.
If the height of each rib is not constant, the ratio is calculated from the maximum value of the height of each rib.
The height of each rib and the height of the internal space correspond to the heights _dh and Z, respectively, in FIG. 1B.

Further, in the projection drawing of the ribs in the direction perpendicular to the facing direction of the two facing sides, the ratio of the total width of each rib to the width of the internal space of the cooling plate for LIB is 0.1 to 0.98. It is preferably 0.15 to 0.95, more preferably 0.2 to 0.9, and even more preferably 0.2 to 0.9. When the ratio of the total width of each rib is in the above range, the dispersion of the plurality of ribs in the opposite direction is good, and the ribs have a good obstacle to the flow of the cooling solvent from the cooling solvent inlet side to the cooling solvent outlet side. Therefore, the cooling solvent tends to be efficiently stirred.
Further, in the projection drawing in the direction perpendicular to the facing direction, the ratio of the average width of each rib to the width of the internal space of the cooling plate for LIB is preferably 0.005 to 0.3, which is more preferable. Is 0.008 to 0.28, more preferably 0.01 to 0.25. When the average ratio of the widths of the ribs is in the above range, each rib has a good obstacle to the flow of the cooling solvent from the cooling solvent inlet side to the cooling solvent outlet side (the obstacle is enough to cause the cooling solvent to stay). The cooling solvent tends to be agitated efficiently.
When the width of each rib is not constant (for example, when the three-dimensional shape of the rib is a cone shape, a cone shape, etc.), the above ratio is obtained from the maximum value of the width of each rib.
The width of each rib and the width of the internal space correspond to the widths d _w2 and X in FIG. 1A, respectively.

Further, for the ribs, the ratio of the area of the rib arrangement region where the ribs are arranged on the bottom surface of the cooling plate for LIB to the area of the bottom surface is preferably 0.001 to 0.5, and more preferably 0. It is 005 to 0.45, more preferably 0.01 to 0.4. When the ratio of the area of the rib placement region is within the above range, the placement density of the plurality of ribs is good, which hinders the flow of the cooling solvent from the cooling solvent inlet side to the cooling solvent outlet side, and the cooling solvent is efficient. It tends to be well agitated.

Further, the cooling plate for LIB of the present embodiment has a plurality of rib rows composed of a plurality of ribs arranged at a predetermined pitch in a direction perpendicular to the facing direction of the two facing side surfaces on the bottom surface in the facing direction. You may.
In the rib row, one end of the rib of the other rib row may be located between the ribs of one rib row between the adjacent rib rows when viewed from the opposite direction.
FIG. 1A is an example of a cooling plate for a LIB having six rib rows consisting of four ribs arranged at a predetermined pitch e in the y-axis direction in the x-axis direction.

In the rib row, the ratio of the pitch to the width of the internal space of the cooling plate for LIB in the projection drawing in the opposite direction is preferably 0.01 to 0.43, more preferably 0.03 to 0. It is 40, more preferably 0.05 to 0.38. When the pitch ratio is in the above range, the ribs constituting the rib row are well dispersed in the direction perpendicular to the opposite direction, and a good obstacle to the flow of the cooling solvent from the cooling solvent inlet side to the cooling solvent outlet side. (It does not cause an obstacle that causes the cooling solvent to stay), and the cooling solvent tends to be agitated efficiently.

In the cooling plate for LIB of the present embodiment, when the rib has a plan view shape having an extending direction, the absolute value of the small angle θ among the angles formed by the extending direction of the rib and the facing direction is 5 to 5. It is preferably 45 °, more preferably 7 to 40 °, and even more preferably 10 to 30 °. When the absolute value of the angle θ is in the above range, each rib becomes a good obstacle for the flow of the cooling solvent from the cooling solvent inlet side to the cooling solvent outlet side (it does not become an obstacle enough to cause the cooling solvent to stay). ), The cooling solvent tends to be agitated efficiently.
The extending direction of the rib is the direction connecting the width center of one end to be extended and the width center of the other end.

Further, in the cooling plate for LIB of the present embodiment, in a plan view with the cooling solvent inlet side on the left and the cooling solvent outlet side on the right, a straight line indicating the extending direction of the rib having the above-mentioned extending direction and having a plan view shape. When has a positive inclination, the above angle θ is defined as a positive angle, and when the straight line indicating the extending direction of the rib having a plan view shape having an extending direction has a negative inclination, the angle θ is defined as a negative angle. (See FIG. 1A), the sum of the angles θ of each rib is preferably −90 ° to 90 °, more preferably −80 ° to 80 °, and even more preferably −60 ° to 60 °. °. When the sum of the angles θ is in the above range, the ribs having a positive angle and the ribs having a negative angle are well mixed, and these ribs are the cooling solvent from the cooling solvent inlet side to the cooling solvent outlet side. It becomes a good obstacle to the flow, and the cooling solvent tends to be agitated efficiently.

In the cooling plate for LIB of the present embodiment, the bottom surface and the side surface contain resin, and it is preferable that the bottom surface and the side surface are made of resin. Since it contains a resin, it is lighter in weight and has better thermal efficiency than a conventional metal cooling plate for LIB.
The resin is not particularly limited, and may be a thermoplastic resin or a thermosetting resin, or may optionally be a resin composition further containing the additives described below.
Above all, the bottom surface and the side surface are preferably resin foams from the viewpoint of heat retention and weight reduction in a low temperature environment. The resin foam may contain a base resin containing a thermoplastic resin or a thermosetting resin, and may optionally be a foamed resin composition further containing an additive described below.

Examples of the resin foam include an extruded foam, an injection foam, a bead foam (a foam composed of foam particles), a stretched foam, a solvent-extracted foam, and the like, which will be described later, respectively. Refers to a foam produced by a method, a bead foaming method, a stretch foaming method, or a solvent extraction foaming method. Above all, a bead foam is preferable from the viewpoint of formability (easy to process even a complicated shape).
The foaming ratio of the resin foam is not particularly limited, but is preferably 2.0 to 20 cm ³ / g, and more preferably 3.5 to 15 cm ³ / g. When the foaming ratio is in the above range, it is easy to exhibit heat insulating properties while maintaining strength.

When the bottom surface and the side surface are resin foams, the surfaces of the bottom surface and the side surface may be coated with a water blocking material in order to improve the water stopping property.
The water blocking material is not particularly limited, and conventionally known materials can be used.

-Thermoplastic resin-
Examples of the thermoplastic resin include polyethylene, polypropylene, polyolefin resins such as EVA (ethylene-vinyl acetate copolymer), polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, ABS (acrylonitrile-butadiene-styrene) resin, and AS. (Acrylonitrile-styrene) resin, polystyrene resin, methacrylic resin, polyamide resin, polycarbonate resin, polyphenylene ether resin, polyimide resin, polyacetal resin, polyester resin, acrylic resin, cellulose resin, styrene resin , Polyvinyl chloride-based, polyurethane-based, polyester-based, polyamide-based, 1,2-polybutadiene-based, fluororubber-based thermoplastic elastomer, polyamide-based, polyacetal-based, polyester-based, fluorine-based thermoplastic engineering plastic, powder Examples include rubber. Further, a modified or crosslinked resin may be used as long as the effect of the present invention is not impaired.
Of these, amorphous resins are preferable, and polystyrene-based resins and polyphenylene ether-based resins are particularly preferable, from the viewpoints of linear expansion coefficient and rigidity.
These may be used alone or in combination of two or more.

－－Polystyrene resin －－
The polystyrene-based resin refers to a homopolymer of styrene and a styrene derivative, and a copolymer containing styrene and a styrene derivative as a main component (a component contained in the polystyrene-based resin in an amount of 50% by mass or more).
Examples of the styrene derivative include o-methylstyrene, m-methylstyrene, p-methylstyrene, t-butylstyrene, α-methylstyrene, β-methylstyrene, diphenylethylene, chlorostyrene, bromostyrene and the like.

Examples of the polystyrene-based resin of the homopolymer include polystyrene, polyα-methylstyrene, polychlorostyrene and the like.
Examples of the polystyrene-based resin of the copolymer include styrene-butadiene copolymer, styrene-acrylonitrile copolymer, styrene-maleic acid copolymer, styrene-maleic anhydride copolymer, and styrene-maleimide copolymer. Styrene-N-phenylmaleimide copolymer, styrene-N-alkylmaleimide copolymer, styrene-N-alkyl substituted phenylmaleimide copolymer, styrene-acrylic acid copolymer, styrene-methacrylic acid copolymer, styrene- Dual copolymers such as methyl acrylate copolymer, styrene-methyl methacrylate copolymer, styrene-n-alkyl acrylate copolymer, styrene-n-alkyl methacrylate copolymer, ethyl vinylbenzene-divinylbenzene copolymer, etc. A ternary copolymer such as ABS, butadiene-acrylonitrile-α-methylbenzene copolymer; styrene grafted polyethylene, styrene grafted ethylene-vinyl acetate copolymer, (styrene-acrylic acid) grafted polyethylene, styrene grafted polyamide, etc. Examples include graft copolymers.
These may be used alone or in combination of two or more.

The weight average molecular weight (Mw) of the polystyrene-based resin is preferably 180,000 to 500,000.
In the present disclosure, the weight average molecular weight (Mw) is measured by gel permeation chromatography (GPC) for the resin, and the molecular weight of the peak of the chromatogram is a calibration line obtained from the measurement of commercially available standard polystyrene. Refers to the weight average molecular weight obtained using (created using the peak molecular weight of standard polystyrene).

The content of the polystyrene-based resin in the base resin is not particularly limited, and may be appropriately adjusted so that the other components have a desired content.

--Polyphenylene ether-based resin ---
The polyphenylene ether (PPE) -based resin may be a polymer represented by the following general formula (1).
Here, in the general formula (1), R ¹ , R ² , R ³ and R ⁴ are independently represented by a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a phenyl group, or a halogen and the general formula (1). ) Indicates a haloalkyl group or a haloalkoxy group having at least two carbon atoms between the benzene ring and the benzene ring and containing no 3α-carbon atom. Further, in the formula (1), n is an integer representing the degree of polymerization.

Examples of polyphenylene ether-based resins include poly (2,6-dimethyl-1,4-phenylene) ether, poly (2,6-diethyl-1,4-phenylene) ether, and poly (2-methyl-6-ethyl). -1,4-phenylene) ether, poly (2-methyl-6-propyl-1,4-phenylene) ether, poly (2,6-dipropyl-1,4-phenylene) ether, poly (2-ethyl-6) -Propyl-1,4-phenylene) ether, poly (2,6-dibutyl-1,4-phenylene) ether, poly (2,6-dilauryl-1,4-phenylene) ether, poly (2,6-diphenyl) -1,4-diphenylene) ether, poly (2,6-dimethoxy-1,4-phenylene) ether, poly (2,6-diethoxy-1,4-phenylene) ether, poly (2-methoxy-6-ethoxy) -1,4-phenylene) ether, poly (2-ethyl-6-stearyloxy-1,4-phenylene) ether, poly (2,6-dichloro-1,4-phenylene) ether, poly (2-methyl- 6-Phenyl-1,4-phenylene) ether, poly (2,6-dibenzyl-1,4-phenylene) ether, poly (2-ethoxy-1,4-phenylene) ether, poly (2-chloro-1,, Examples thereof include 4-phenylene) ether and poly (2,6-dibromo-1,4-phenylene) ether. Among these, those in which R ¹ and R ² are alkyl groups having 1 to 4 carbon atoms and R ³ and R ⁴ are hydrogen or an alkyl group having 1 to 4 carbon atoms are particularly preferable.
These may be used alone or in combination of two or more.

The weight average molecular weight (Mw) of the polyphenylene ether-based resin is preferably 20,000 to 60,000.
In the present disclosure, the weight average molecular weight (Mw) is measured by gel permeation chromatography (GPC) for the resin, and the molecular weight of the peak of the chromatogram is a calibration line obtained from the measurement of commercially available standard polystyrene. Refers to the weight average molecular weight obtained using (created using the peak molecular weight of standard polystyrene).

From the viewpoint of heat resistance, flame retardancy, and processability, the content of the polyphenylene ether-based resin is preferably 20 to 80% by mass, more preferably 25 to 75% by mass with respect to 100% by mass of the base resin. %, More preferably 30 to 70% by mass.

Examples of the thermosetting resin include amino-based resins such as phenol-based resins, urea resins, and melamine resins, unsaturated polyester-based resins, and epoxy-based resins.
These may be used alone or in combination of two or more.

Additives include resins other than the above, flame retardants, flame retardants, antioxidants, heat stabilizers, lubricants, pigments, dyes, dripping inhibitors, weathering improvers, UV absorbers, light absorbers. , Plastics, mold release agents, antistatic agents, impact resistant modifiers, inorganic fillers, nucleating agents such as talc, rubber components and the like.
The content of the additive is preferably 40 parts by mass or less with 100 parts by mass of the base resin.

The flame retardant is not particularly limited, and examples thereof include an organic flame retardant and an inorganic flame retardant.
Examples of the organic flame retardant include halogen-based compounds typified by bromine compounds, non-halogen-based compounds typified by phosphorus-based compounds and silicone-based compounds, and the like.
Examples of the inorganic flame retardant include aluminum hydroxide, metal hydroxide typified by magnesium hydroxide, antimony trioxide, and antimony compounds typified by antimony pentoxide.
These may be used alone or in combination of two or more.

Among the above flame retardants, non-halogen flame retardants, which are organic flame retardants, are preferable, and phosphorus flame retardants and silicone flame retardants are more preferable, from the viewpoint of environmental friendliness.

As the phosphorus-based flame retardant, one containing phosphorus or a phosphorus compound can be used. Examples of phosphorus include red phosphorus. Further, examples of the phosphorus compound include a phosphoric acid ester and a phosphazene compound having a bond between a phosphorus atom and a nitrogen atom in the main chain.
Examples of the phosphoric acid ester include trimethyl phosphate, triethyl phosphate, tripropyl phosphate, tributyl phosphate, tripentyl phosphate, trihexyl phosphate, tricyclohexyl phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate and cresyldiphenyl. Examples thereof include phosphate, dicredylphenyl phosphate, dimethylethyl phosphate, methyldibutyl phosphate, ethyldipropyl phosphate, hydroxyphenyldiphenyl phosphate, resorcinol bisdiphenyl phosphate, etc., and phosphate ester compounds obtained by modifying these with various substituents and the like. , Various condensation type phosphate ester compounds are also mentioned.
Of these, triphenylphosphine and condensation-type phosphoric acid ester compounds are preferable from the viewpoints of heat resistance, flame retardancy, and foamability.
These may be used alone or in combination of two or more.

Examples of the silicone flame retardant include (mono or poly) organosiloxane.
Examples of the (mono or poly) organosiloxane include monoorganosiloxanes such as dimethylsiloxane and phenylmethylsiloxane; polydimethylsiloxane and polyphenylmethylsiloxane obtained by polymerizing them; and organopolysiloxanes such as copolymers thereof. And so on.
In the case of organopolysiloxane, the linking group of the main chain or the branched side chain is a hydrogen, an alkyl group or a phenyl group, preferably a phenyl group, a methyl group, an ethyl group or a propyl group, but is not limited thereto. The terminal bonding group may be a hydroxyl group, an alkoxy group, an alkyl group, or a phenyl group. The shape of the silicones is not particularly limited, and any shape such as oil-like, gum-like, varnish-like, powder-like, and pellet-like can be used.
These may be used alone or in combination of two or more.

The content of the flame retardant may be within the range of the content of the above additive, but from the viewpoint of improving the flame retardancy of the resin composition (foam), the base resin is 100 parts by mass, preferably 5 to 30 parts. It is by mass, more preferably 10 to 25 parts by mass.

Examples of the rubber component include butadiene, isoprene, 1,3-pentadiene and the like. These are preferably those dispersed in the form of particles in a continuous phase made of a polystyrene-based resin. As a method of adding these rubber components, the rubber component itself may be added, or a resin such as a styrene-based elastomer or a styrene-butadiene copolymer may be used as a rubber component supply source.

The content of the rubber component may be within the range of the content of the additive, but the base resin is 100 parts by mass, preferably 1 to 20 parts by mass, and more preferably 3 to 18 parts by mass. When the content of the rubber component is within the above range, the resin is excellent in flexibility and elongation, the foamed cell film is less likely to break during foaming, and a foam having excellent moldability and mechanical strength can be easily obtained.

The method for producing the resin foam is not particularly limited, and examples thereof include an extrusion foaming method, an injection foaming method, a bead foaming method (in-mold foaming method), a stretch foaming method, and a solvent extraction foaming method.
The extrusion foaming method is a method of obtaining a foam by injecting an organic or inorganic foaming agent into a molten resin using an extruder and releasing the pressure at the outlet of the extruder.
The injection foaming method is a method of obtaining a foam having pores by injection molding a resin having foamability and foaming it in a mold.
The bead foaming method (in-mold foaming method) is a method in which foamed particles are filled in a mold and heated with steam or the like to expand the foamed particles, and at the same time, the foamed particles are heat-sealed to obtain a foam. ..
The stretch foaming method is a method in which an additive such as a filler is kneaded in a resin in advance and the resin is stretched to generate microvoids to obtain a foam.
The solvent extraction foaming method is a method in which an additive that dissolves in a predetermined solvent is added to a resin, and a molded product is immersed in a predetermined solvent to extract the additive to obtain a foam.

The foaming agent is not particularly limited, and a commonly used gas can be used.
Examples thereof are inorganic gases such as air, carbon dioxide, nitrogen gas, oxygen gas, ammonia gas, hydrogen gas, argon gas, helium gas, neon gas; trichlorofluoromethane (R11), dichlorodifluoromethane (R12), chlorodifluoromethane. Fluorocarbons such as (R22), tetrachlorodifluoroethane (R112) dichlorofluoroethane (R141b) chlorodifluoroethane (R142b), difluoroethane (R152a), HFC-245fa, HFC-236ea, HFC-245ca, HFC-225ca; propane, n- Saturated hydrocarbons such as butane, i-butane, n-pentane, i-pentane, neopentane; dimethyl ether, diethyl ether, methyl ethyl ether, isopropyl ether, n-butyl ether, diisopropyl ether, furan, furfural, 2-methylfuran, tetrahydrofuran , Esters such as tetrahydropyran; dimethyl ketone, methyl ethyl ketone, diethyl ketone, methyl n-propyl ketone, methyl n-butyl ketone, methyl i-butyl ketone, methyl n-amyl ketone, methyl n-hexyl ketone, ethyl n-propyl ketone, ethyl. Ketones such as n-butylketone; alcohols such as methanol, ethanol, propyl alcohol, i-propyl alcohol, butyl alcohol, i-butyl alcohol, t-butyl alcohol; oxymethyl ester, oleic acid ethyl ester, oleate propyl ester, oleic acid Carboxylic acid esters such as butyl esters, amylic acid amyle esters, propionic acid methyl esters, propionic acid ethyl esters; chlorinated hydrocarbons such as methyl chloride and ethyl chloride; and the like can be mentioned.
These may be used alone or in combination of two or more.

From the viewpoint of flame retardancy, the foaming agent is preferably non-flammable or non-flammable or less, and from the viewpoint of gas safety, inorganic gas is more preferable. In addition, the inorganic gas is less soluble in the resin than the organic gas such as hydrocarbons, and the gas is easily released from the resin after the foaming process and the molding process. There is also. Further, when an inorganic gas is used, the resin is less likely to be plasticized by the residual gas, and there is an advantage that excellent heat resistance can be easily developed from an earlier stage without going through a process such as aging. Among the inorganic gases, carbon dioxide gas is preferable from the viewpoint of solubility in the resin and ease of handling. In addition, hydrocarbon-based organic gases are generally highly flammable, and when they remain in the foam, their flame retardancy tends to deteriorate.

The resin foam of the present embodiment is preferably a bead foam made of foamed particles produced by the above-mentioned bead foaming method. In the case of the bead foaming method, since a mold having a desired shape is created and foamed particles are filled therein for molding, it is easy to mold the foam into a finer shape or a complicated shape.

The foamed particles used in the bead foaming method can be obtained by impregnating (impregnating) the base resin with a foaming agent to cause foaming. Specifically, for example, according to the method described in Example 1 of JP-A-4-372630, a base resin (pellet-like, bead-like, etc.) is housed in a pressure-resistant container, and the gas in the container is dried air. After replacement with, the foaming agent (gas) is press-fitted to impregnate the base resin with the foaming agent (gas), and then the pressure is released to transfer the base material resin pellets from the pressure vessel to the foaming furnace to transfer the base material resin pellets to the base material. Examples thereof include a method of producing foamed particles by heating the resin pellets with pressurized steam while rotating the stirring blades in the foaming furnace to foam the resin pellets.
The conditions for impregnating the base resin with the foaming agent (gas) are not particularly limited, and from the viewpoint of more efficiently impregnating the base resin with the foaming agent (gas), for example, The impregnation pressure is preferably 0.3 to 30 MPa, the impregnation temperature is −20 to 100 ° C., and the impregnation time is preferably 10 minutes to 96 hours. Further, the maximum vapor pressure of the pressurized steam in the foaming furnace is preferably 30 to 700 kPa · G from the viewpoint of easily obtaining a desired magnification and improving the appearance.
In the method for producing foamed particles, the time from the completion of the release pressure in the pressure-resistant container (release of the impregnation pressure) to the start of heating by the pressurized steam in the foaming furnace is preferably less than 600 seconds. , 300 seconds or less, more preferably 120 seconds or less, and particularly preferably 60 seconds or less. When the time is within the above range, it is possible to suppress the non-uniform diffusion of the gas impregnated in the base resin, so that the bubble diameter can be made uniform and the increase in the bubble diameter can be prevented. ..

The method for molding the foam using the foamed particles is not particularly limited, but for example, the foamed particles are filled in the cavity of the molding die and heated to cause expansion and at the same time heat the foamed particles to each other. Examples thereof include a method of solidifying the product by cooling after fusion and molding. The method for filling the foamed particles is not particularly limited, and a known method can be used.
Before filling the cavity of the molding die with the foamed particles, it is preferable to pressurize the foamed particles with a gas. By applying a constant gas pressure to the bubbles of the foamed particles, the foamed particles constituting the obtained foam can be firmly fused to each other, and the rigidity and appearance of the molded body can be improved. The gas used for the pressure treatment is not particularly limited, but air or an inorganic gas is preferable from the viewpoint of ease of handling and economy. The method of the pressure treatment is not particularly limited, but after filling the foamed particles in the pressure vessel, a pressure gas is introduced and the pressure is increased to a maximum pressure of 0.1 to 20 MPa over 10 minutes to 96 hours. Therefore, a method of supplying gas into the pressurized container can be mentioned.
Examples of the heating method for forming the foamed particles include heating using a heat medium such as steam, heating using a heater such as an IR heater, and heating using microwaves. When heating using a heat medium, it may be a general-purpose heat medium, and steam is preferable from the viewpoint of efficiently heating the resin.

The molding method for molding the resin composition containing the thermoplastic resin or the thermosetting resin and optionally the additive on the side surface and the bottom surface of the cooling plate for LIB is not particularly limited, and a known method can be used. .. For example, injection molding, extrusion molding, heat press molding, compression molding, transfer molding, casting molding, laser welding molding, reaction injection molding (RIM molding), rim molding (LIM molding), spray molding and the like can be mentioned.

The method for processing the resin foam on the side surface and the bottom surface of the LIB cooling plate is not particularly limited, but is a method of filling a molding die with foamed particles or a resin having foamability, and resin foaming. Examples thereof include a method of cutting the body with a cutting tool such as a saw blade and a die cutting blade, a method of cutting with a mill, a method of adhering a plurality of foams with heat or an adhesive, and the like. Above all, since the cooling plate for LIB including the ribs can be integrally molded, the method of filling the foamed particles in the molding die and molding is preferable.

<Cooling kit for LIB>
The LIB cooling kit of the present embodiment is characterized by including the above-mentioned LIB cooling plate of the present embodiment, a metal plate, and packing.
The metal plate is fixedly mounted on the upper surface of the side surface of the cooling plate for LIB so as to form a box shape (which becomes the upper surface of the cooling plate for LIB) together with the cooling plate for LIB. A packing is interposed between the metal plate and the upper surface of the side surface of the cooling plate for LIB to form a waterproof structure. When the cooling plate for LIB has the above-mentioned groove on the upper surface of the side surface thereof, it is preferable that the packing can be accommodated in the groove from the viewpoint of enhancing the water stopping property.
FIG. 2 is a schematic cross-sectional view showing an example of the LIB cooling kit of the present embodiment (ribs of the LIB cooling plate are not shown). The metal plate 7 is fixedly attached to the LIB cooling plate via the packing 6 accommodated in the groove portion to form the LIB cooling kit 10.

Examples of the metal species constituting the metal plate include aluminum, aluminum alloy, copper, and copper alloy. Of these, aluminum and aluminum alloys are preferable from the viewpoint of lightness.
The plan view shape of the metal plate is not particularly limited as long as it can be combined with the LIB cooling plate to form a box shape (which is the upper surface of the LIB cooling plate), and is, for example, a square, a rectangle, or a parallelogram. , Trapezoid, hexagon and other polygons, and the corners may be rounded. Further, the shape may include curved sides such as an oval (a shape in which both ends of a pair of parallel straight lines are connected by a semicircle).
The method of fixing and mounting the metal plate to the LIB cooling plate is not particularly limited, and for example, a flange is provided on the upper surface of the side surface of the LIB cooling plate, and the flange and the outer peripheral end of the metal plate are riveted or screwed. The method and the like can be mentioned.

The shape of the packing is not particularly limited as long as it is possible to fix the upper surface of all the side surfaces of the cooling plate for LIB and the metal plate with sufficient strength to form a waterproof structure. When the cooling plate for LIB has the above-mentioned groove on the upper surface of the side surface thereof, the shape of the packing is preferably a shape that can be accommodated in the groove from the viewpoint of enhancing the water stopping property.
The packing material is not particularly limited as long as it is possible to fix the LIB cooling plate and the metal plate with sufficient strength to form a waterproof structure, and the packing material is not particularly limited, for example, SBR (styrene-butadiene rubber). , NBR (acrylonitrile-butadiene rubber), EPDM (ethylene propylene / diene rubber), CR (chloroprene rubber) and other synthetic rubbers.

Hereinafter, embodiments of the present invention will be described with reference to examples. However, the scope of the present invention is not limited to the examples.

[Measuring method]
The measurement methods used in the examples and comparative examples are as follows.

(1) Temperature uniformity of cooling solvent After operating LIB (LEV50-4 manufactured by Lithium Energy Japan Corporation) for 3 hours at an environmental temperature of 45 ° C., the cooling kits for LIB obtained in Examples and Comparative Examples Was cooled using. The cooling water input temperature was 10 ° C. and the flow rate was 0.15 L / min. 10 minutes after cooling, near the center of each of the eight locations (cooling solvent inlet, cooling solvent outlet, four corners of the kit, cooling solvent inlet and outlet) (midpoint in the x-axis direction in FIG. 1A). The temperature of the cooling solvent was measured at 8 places in total).
The temperature uniformity of the cooling solvent was evaluated according to the following evaluation criteria.
<Evaluation criteria>
〇 (Good): The difference between the maximum and minimum values of the temperatures at 8 locations is less than 5 ° C. × (impossible): The difference between the maximum and minimum values of the temperatures at 8 locations is 5 ° C or more.

(2) Cooling efficiency The difference (Ta-Tb) between the temperature Ta of the LIB main body before cooling and the temperature Tb of the LIB main body after 10 minutes cooling was obtained, and the cooling efficiency was evaluated according to the following evaluation criteria. The temperature of the LIB main body was set to the center temperature of the top plate of the LIB.
<Evaluation criteria>
〇 (Good): (Ta-Tb) is 5 ° C or higher × (impossible): (Ta-Tb) is less than 5 ° C

[Example 1]
S201A (manufactured by Asahi Kasei Co., Ltd.) is 50% by mass as a polyphenylene ether resin (PPE), bisphenol A-bis (diphenyl phosphate) (BBP) is 15% by mass as a non-halogen flame retardant, and the rubber component is 0.6. Add 10% by mass of impact-resistant polystyrene resin (HIPS) having a rubber concentration of 6% by mass and 25% by mass of GP685 (manufactured by PS Japan Co., Ltd.) as general-purpose polystyrene resin (PS) so as to be mass%. After heating, melting and kneading with an extruder, the base resin pellets were prepared.
According to the method described in Example 1 of JP-A-4-372630, the base resin pellets are housed in a pressure-resistant container, the gas in the container is replaced with dry air, and then carbon dioxide (gas) is used as a foaming agent. After injecting and impregnating the base resin pellets with 7% by mass of carbon dioxide under the conditions of a pressure of 3.2 MPa and a temperature of 11 ° C. for 3 hours, the base resin pellets are immediately transferred after being taken out from the pressure vessel. Then, the base resin pellets were foamed with pressurized steam having a maximum of 330 kPa · G while rotating the stirring blades at 77 rpm in the foaming furnace to obtain foamed particles. At this time, the time from the time when the impregnation was completed and the release pressure was completed to the start of introduction of the pressurized steam was 10 seconds.
Then, the foamed particles were placed in a container, and pressurized air was introduced (pressurized to 0.5 MPa over 1 hour and then held at 0.5 MPa for 8 hours) to perform a pressure treatment. This is filled in an in-mold molding die having steam holes, heated with steam to expand and fuse the foamed particles to each other, then cooled, taken out from the molding die, and a resin composed of foamed particles. A cooling plate for LIB of a foam (foaming ratio 10 cm ³ / g) was obtained.
The shape of the cooling plate for LIB was the shape shown in FIG. 1 except for the ribs (a rectangular parallelepiped shape with an open top surface having a cooling solvent inlet, a cooling solvent outlet, and a groove). The inner dimensions are 160 mm (x-axis direction) x 80 mm (y-axis direction) x 30 mm (z-axis direction), and the outer dimensions are 200 mm (x-axis direction) x 120 cm (y-axis direction) x 40 mm (z-axis direction). The thickness of the bottom surface was 10 mm, and the thickness of the side surface was 20 mm. The openings of the cooling solvent inlet and the cooling solvent outlet are both 15 mm (y-axis direction) × 15 mm (z-axis direction) squares, and the width center of the openings is located at the center of the side surface in the y-axis direction. The lower end of the opening is located at the lower end of each side surface. The depth of the groove was 5 mm and the width was 5 mm so that the center of the width of the groove was located at the center of the upper surface of each side surface in the lateral direction.
Further, after the packing was housed in the groove of the obtained cooling plate for LIB, an aluminum plate (200 mm × 120 mm × thickness 1 mm) was fixedly mounted on the upper surface of the side surface of the cooling plate for LIB to prepare a cooling kit for LIB. ..
Table 1 shows the shape, size, number, etc. of ribs and evaluation results of the LIB cooling plate and the LIB cooling kit.

[Comparative Example 1]
A cooling plate for LIB and a cooling kit for LIB were produced in the same manner as in Example 1 except that the ribs were not formed.
Table 1 shows the evaluation results of the LIB cooling plate and the LIB cooling kit.

[Example 2, Comparative Example 2]
A cooling plate for LIB and a cooling kit for LIB were produced in the same manner as in Example 1 except that the size, number, and the like of the ribs were changed as shown in Table 1.
Table 1 shows the shape, size, number, etc. of ribs and evaluation results of the LIB cooling plate and the LIB cooling kit.

[Comparative Example 3]
A cooling plate for LIB and a cooling kit for LIB were produced in the same manner as in Example 1 except that the bottom surface and all the side surfaces were made of aluminum.
Table 1 shows the evaluation results of the LIB cooling plate and the LIB cooling kit.

The LIB cooling plate of the present embodiment is lightweight, can efficiently and uniformly cool the entire LIB, and has good thermal efficiency. Therefore, the LIB to be mounted on an automobile, a railroad vehicle, an aircraft, or the like is cooled. It can be suitably used as a cooling plate.

1: Cooling plate for LIB 2: Cooling solvent inlet 3: Cooling solvent outlet 4: Rib 5: Groove 6: Packing 7: Metal plate 10: Cooling kit for LIB

Claims (9)

A box-shaped cooling plate for LIB with an open top surface having two opposite sides and a bottom surface.
The two facing surfaces are provided with a cooling solvent inlet for flowing in the cooling solvent and a cooling solvent outlet for flowing out the cooling solvent, respectively.
The bottom surface has a plurality of ribs and has a plurality of ribs.
In the projection drawing in the facing direction, the ratio of the total width of the plurality of ribs to the width of the internal space of the cooling plate for LIB is 0.4 to 0.98.
A cooling plate for LIB, wherein the bottom surface and the side surface contain a resin. The cooling for LIB according to claim 1, wherein the ratio of the average width of the plurality of ribs to the width of the internal space of the cooling plate for LIB is 0.05 to 0.3 in the projection drawing in the facing direction. plate. The cooling plate for LIB according to claim 1 or 2, which has a plurality of rib rows composed of a plurality of ribs arranged in a direction perpendicular to the facing direction at a predetermined pitch in the facing direction. The cooling plate for LIB according to claim 3, wherein the ratio of the pitch to the width of the internal space of the cooling plate for LIB in the projection drawing in the opposite direction is 0.01 to 0.43. Claims 1 to 4 wherein the rib has a plan view shape having an extending direction, and the absolute value of a small angle θ among the angles formed by the extending direction of the rib and the facing direction is 5 to 45 °. The cooling plate for LIB according to any one of the above items. In a plan view with the cooling solvent inlet side on the left and the cooling solvent outlet side on the right, the straight line indicating the extending direction of the rib having the extending direction and the plan view shape has a positive inclination. When the angle θ is a positive angle and the straight line indicating the extending direction of the rib having the plan view shape having the extending direction has a negative inclination, the angle θ is a negative angle. The cooling plate for LIB according to claim 5, wherein the total of θ is −90 ° to 90 °. The cooling plate for LIB according to any one of claims 1 to 6, wherein the bottom surface and the side surface are resin foams. The cooling plate for LIB according to any one of claims 1 to 7, which has a groove portion capable of accommodating packing on the upper surface of the side surface. A cooling kit for LIB, which comprises the cooling plate for LIB according to any one of claims 1 to 8, a metal plate, and a packing.

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