CN209401796U - battery pack - Google Patents

Abstract

The utility model provides a kind of battery apparatus can be cooling well by all monocell efficiency for constituting battery pack or heated.Battery apparatus (1) has the heat-conduction component (7) for transmitting cold energy or thermal energy possessed by the interior heat transfer medium flowed of heat transfer medium logical circulation road (6) of heat transmitter (4) to each monocell (3) of battery pack (2).In heat-conduction component (7), contact portion (15) are flanked by the 1st monocell, 1st linking part (18) and the 2nd linking part (19) form the variant part (10) with spring, 1st monocell flanks contact portion (15) and contacts with the 1st heating surface (13) of monocell (3), the heat transmitter that 1st monocell is flanked contact portion (15) and contacted with the heat-transfer area (5) of heat transmitter (4) by the 1st linking part (18) flanks contact portion (17) connection, the 2nd monocell contacted with the 2nd heating surface (14) of monocell (3) is flanked contact portion (16) and heat transmitter flanks contact portion (17) connection by the 2nd linking part (19).

Description

battery pack

technical field

The utility model relates to a battery pack device.

In the scope of the specification and claims, "aluminum" includes pure aluminum and aluminum alloys.

Background technique

For example, as a battery device for driving a motor of a hybrid vehicle, an electric vehicle, etc., a battery device in the form of a battery pack in which a plurality of small cells composed of various secondary batteries such as lithium-ion secondary batteries are used in series or in parallel is used. . In particular, electric vehicles require a larger capacity of battery packs in order to extend the cruising distance, so a plurality of battery packs are combined in series or in parallel.

However, the performance and life of the secondary battery vary depending on the use temperature, so it is necessary to use it at an appropriate temperature in order to use it efficiently for a long period of time.

Therefore, in order to reduce the temperature difference of all the single cells in the battery pack as described above, a cooling device provided with a metal cooling member whose top wall outer surface is a flat heat transfer surface has been proposed. In addition, it has a refrigerant passage through which a refrigerant flows (refer to Patent Document 1).

In the cooling device described in Patent Document 1, the battery pack is placed on the heat transfer surface of the cooling member through a heat conduction sheet made of synthetic resin such as silicone resin, and is cooled by the refrigerant flowing through the refrigerant passage of the cooling member. The cold energy transferred to the battery pack by the top wall of the component and the heat conduction sheet cools the battery pack. In order to improve the cooling efficiency of the battery pack, it is necessary to improve the adhesion between the heat transfer surface of the cooling component and the heat conduction sheet, as well as the heat receiving surface and heat conduction of the battery pack. The tightness of the sheet.

However, in the battery pack described above, each unit cell may be deformed, or at least a part of the unit cells may be shifted in the vertical direction, resulting in a step difference in the heating surface. Therefore, in order to absorb these deformations and step differences and improve the adhesion between the heat receiving surface of the battery pack and the heat conduction sheet, it is necessary to increase the wall thickness of the heat conduction sheet. However, since the thermal conductivity of the thermal conduction sheet made of synthetic resin is low, if the thickness of the thermal conduction sheet is increased, the thermal conductivity between the heat receiving surface of the battery pack and the heat transfer surface of the cooling member will decrease, and efficient cooling will not be possible. Single cells of the battery pack.

prior art literature

Patent Document 1: Japanese Patent No. 6020942

Contents of the invention

An object of the present invention is to solve the above problems and provide a battery pack device capable of efficiently cooling or heating all single cells constituting the battery pack.

In order to achieve the above object, the utility model includes the following technical solutions.

1) A battery pack device comprising a battery pack, a heat spreader and a heat transfer member, the battery pack is composed of a plurality of prismatic single cells, the heat spreader has a heat transfer surface on the outside, and has a flow heat transfer inside The heat transfer medium flow path of the medium, the heat conduction part transfers the cold energy or heat energy of the heat transfer medium flowing in the heat transfer medium flow path of the heat exchanger to each single cell of the battery pack, forming all the components of the battery pack The single cells are stacked with one surface facing the heat transfer surface side of the heat spreader and spaced from the heat transfer surface of the heat spreader. The side contact part and the heat spreader side contact part are constituted, the first cell side contact part is in contact with the first heat receiving surface of the cell facing the heat spreader side, and the second cell side contact part is in contact with the cell side contact part. The second heat receiving surface adjacent to the first heat receiving surface is in contact, and the heat spreader side contact portion is provided between the two single cell side contact portions in a manner protruding from the single cell to the heat spreader side, and is connected to the heat spreader The heat transfer surface is in contact, the first cell side contact part of the heat conduction member and the heat exchanger side contact part are connected by the first connecting part integrated with the two, and the second cell side contact part of the heat conduction member is connected to the heat exchanger side. The contact part is connected by the second connecting part which is integrated with both, and the deformation part is formed by the first cell side contact part, the first connecting part and the second connecting part, and the deformation part has spring elasticity, and when subjected to the Elastic deformation occurs when the first heat receiving surface of the battery approaches the heat transfer surface of the heat spreader.

2) The battery pack device according to the above 1), wherein a substantially V-shaped deformed portion with the heat spreader-side contact portion as an apex is formed by the first connecting portion, the second connecting portion, and the heat spreader-side contact portion of the heat conduction member. .

3) The battery pack device according to the above 1) or 2), wherein, among the unit cells of the battery pack, the second end face opposite to the first end face provided with the terminal faces the heat transfer surface side of the heat exchanger, and the second end face of the unit cell The two end faces serve as the first heat-receiving surface, and any one of the two faces in the stacking direction of the side surfaces of the unit cells serves as the second heat-receiving surface, and one heat conduction member is disposed on each unit cell, except The second battery-side contact portion of the heat-conducting member other than the heat-conducting member at one end is disposed between adjacent battery cells of the battery pack.

4) The battery pack device according to the above 1) or 2), wherein, among the unit cells of the battery pack, the second end face opposite to the first end face provided with the terminal faces the heat transfer surface side of the heat exchanger, and the second end face of the unit cell The two end faces serve as the first heat receiving surfaces, and the two faces of the side surfaces of the unit cells that are paired in a direction perpendicular to the stacking direction serve as the second heat receiving surfaces, and two heat conduction members are arranged on each unit cell, The first cell side contact portions of the two heat conduction members are in contact with the first heat receiving surface of each cell, and the second cell side contact portions of the two heat conduction members are in contact with the second heat receiving surface of each cell.

5) The battery pack device according to the above 1) or 2), wherein any one of two faces of the side surfaces of the single cells of the battery pack that are paired in a direction perpendicular to the stacking direction becomes the first heat-receiving face. One of the two faces that are paired in the stacking direction on the side surfaces of the unit cells becomes the second heat receiving surface, and one heat conduction member is arranged on each unit cell, and the other heat conduction members except the heat conduction member at one end The second cell-side contact portion of the component is disposed between adjacent cells of the battery pack.

6) The battery pack device according to any one of 1) to 5) above, wherein the heat spreader has one heat transfer surface, and the battery pack is arranged only on the side of the heat spreader where the heat transfer surface is provided.

7) The battery pack device according to any one of 1) to 5) above, wherein the heat spreader has two heat transfer surfaces facing opposite sides, and the battery pack is arranged on both sides of the heat spreader.

8) The battery pack device according to any one of 1) to 7) above, wherein the carbon particles are composed of at least one selected from carbon nanotubes, graphene, graphite particles, and carbon fibers.

9) The battery pack device according to any one of 1) to 8) above, wherein the composite material of the composite body is composed of an aluminum matrix and carbon particles dispersed in the aluminum matrix.

10) The battery pack device according to the above 9), wherein the composite material of the composite has a plurality of carbon particle dispersed layers in which the carbon particles are dispersed in the plane direction in the aluminum material constituting the aluminum matrix, and A plurality of aluminum layers formed of the aluminum material of the aluminum matrix, the carbon particle dispersion layer and the aluminum layer are alternately stacked and arranged in the thickness direction of the composite body.

11) The battery pack device according to any one of 1) to 10) above, wherein the thermally conductive member is a laminate formed by bonding a single or multiple resin film layers to both surfaces of the composite body via an adhesive layer. Material.

12) The battery pack device according to the above 11), wherein the resin film layer is a multilayer resin film layer of a polyethylene terephthalate film and a nylon film, and the nylon film is disposed on the composite side.

13) The battery pack device according to the above 11) or 12), wherein the adhesive layer is a polyurethane adhesive layer.

According to the battery pack devices of 1) to 13) above, the heat transfer medium flows through the heat transfer medium passage of the heat transfer device, thereby bringing the cold energy or heat energy of the heat transfer medium into contact with the heat transfer device side via the heat transfer member. part, the first connecting part and the first cell side contact part to the first heat receiving surface of the cell, and through the heat spreader side contact part, the second connecting part and the second cell side contact part to the The second heating surface cools or heats the cells. The heat conduction member is composed of a first cell-side contact portion, a second cell-side contact portion, and a heat spreader-side contact portion, and the first cell-side contact portion is in contact with the first heat-receiving surface of the cell facing the heat spreader side. contact, the second cell-side contact portion is in contact with the second heat-receiving surface of the cell adjacent to the first heat-receiving surface, and the heat spreader-side contact portion is between the two cell-side contact portions so as to extend from the cell to the The side of the heat spreader is arranged in a protruding manner and is in contact with the heat transfer surface of the heat spreader. The first cell-side contact portion of the heat conduction member and the heat spreader side contact portion are connected by a first connecting portion integrated with the two, The second cell-side contact portion and the heat spreader-side contact portion of the heat conduction member are connected by the second connecting portion integrated with both, and the deformation is formed by the first cell-side contact portion, the first connecting portion, and the second connecting portion The deformation part has spring elasticity, and elastically deforms when receiving the force that brings the first heat receiving surface of the unit cell close to the heat transfer surface of the heat spreader, so even if each unit cell of the battery pack is deformed, Or the first heating surface of some single cells is offset and misaligned with the first heating surfaces of other single cells, and the elastic deformation of the deformation part can prevent the first heating surface of each single cell of the battery pack from the first heating surface of the heat conduction member. A poor contact occurs between the battery-side contact portions, and as a result, a decrease in thermal conductivity via the thermally conductive member between each unit cell of the battery pack and the heat transfer surface of the heat spreader can be suppressed. Therefore, it is possible to efficiently cool or heat all the cells constituting the battery pack.

In addition, the heat conduction member has a multilayer structure in which carbon particle-dispersed layers and aluminum layers are alternately laminated. The carbon particle-dispersed layer is formed by dispersing carbon particles in an aluminum material. The thermal conductivity is extremely high compared to the thermal conduction sheet of the , and the thermal conductivity between the heat spreader and the single cells of the battery pack is excellent. Therefore, it is possible to efficiently cool or heat the single cells of the battery pack.

According to the battery pack device of the above-mentioned 2), the deformation portion can be formed with a relatively simple structure.

According to the battery pack device of 7) above, a plurality of single cells can be cooled by one heat spreader, and the number of parts can be reduced.

According to the battery pack device of the above 8), the thermal conductivity of the complex can be improved. In addition, the composite of aluminum and carbon particles in the composite can be reliably performed.

According to the battery pack device of the above 9), the offset of the carbon particles in the aluminum matrix is reduced, and the thermal conductivity of the complex is uniform as a whole.

According to the battery pack device of the above 10), the carbon particle dispersed layer of the composite material and the aluminum layer are alternately laminated and arranged throughout the thickness direction of the plate-shaped composite body, so the thickness of the carbon particle dispersed layer can be reduced as much as possible, and the carbon particle can be increased. The number of particle dispersion layers can effectively improve the thermal conductivity of the composite.

According to the battery pack device of the above 11), the thermally conductive member is a laminated material in which resin film layers are bonded to both sides of the composite body, so it has excellent thermal conductivity, insulation, puncture resistance, corrosion resistance, abrasion resistance, and scratch resistance. Scrub resistance, water resistance, chemical resistance, and dust resistance are improved, and sufficient bending strength and spring elasticity can be imparted.

According to the battery pack device of the above 12), since the laminated material used as the heat conduction member includes the nylon film, the puncture resistance can be further improved, and since the nylon film is combined with the polyethylene terephthalate film, it is possible to use Improved water resistance.

According to the battery pack device of the above 13), since the adhesive layer is formed of the polyurethane adhesive layer in the laminated material used as the heat conduction member, high adhesive strength can be ensured regardless of the resin type of the resin film layer.

Description of drawings

FIG. 1 is a side view partially showing a battery pack device of the present invention.

Fig. 2 is a view of the arrow II-II in Fig. 1 .

3 is an enlarged cross-sectional view showing a part of a heat conduction member used in the battery pack device of FIG. 1 .

Fig. 4 is a front view corresponding to Fig. 2 showing another embodiment of the battery pack device of the present invention.

Fig. 5 is a plan view showing another embodiment of the battery pack device of the present invention.

6 is a cross-sectional view showing a first embodiment of a laminated material used as a heat conduction member in the battery pack device of FIG. 1 .

7 is a cross-sectional view showing a second embodiment of a laminate used as a heat conduction member in the battery pack device of FIG. 1 .

Explanation of reference signs

(1)(30)(40): battery pack unit

(2): battery pack

(3): single battery

(4): Heat transfer device

(5): heat transfer surface

(6): heat transfer medium flow path

(7): Heat conduction parts

(8): terminal

(9): Upper end face (1st end face)

(10): deformation part

(11): Lower end face (second end face)

(12): side

(12a): 1st vertical plane

(12b): Second vertical plane

(13): The first heating surface

(14): The second heating surface

(15): 1st cell side contact part

(16): 2nd cell side contact part

(17): Heat transfer side contact part

(18): 1st link

(19): The second link

(20): Complex

(21): composite material

(22): aluminum substrate

(23): carbon particles

(24): main surface epidermis

(25): Carbon particle dispersion layer

(26): aluminum layer

(27): aluminum plate

(51)(52): laminated materials

(61): 1st adhesive layer (adhesive layer)

(62): The second adhesive layer (adhesive layer)

(63): The third adhesive layer (adhesive layer)

(64): The 4th adhesive layer (adhesive layer)

(71): the first resin film layer (resin film layer)

(72): The second resin film layer (resin film layer)

(73): The third resin film layer (resin film layer)

(74): The 4th resin film layer (resin film layer)

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the following description, in the description with reference to each drawing, the up and down of each drawing is taken as the up and down direction.

In addition, the same code|symbol is attached|subjected to the same substance and the same part in all drawings.

1 and 2 show the battery pack device of the present invention, and FIG. 3 shows the structure of the heat conduction member used in the battery pack device of FIG. 1 and FIG. 2 .

In Fig. 1 and Fig. 2, battery pack device (1) comprises battery pack (2), heat spreader (4) and heat conduction member (7), and battery pack (2) is made of a plurality of square lithium ion secondary batteries etc. flat Shaped square cells (3), the heat spreader (4) is arranged under the battery pack (2), has a heat transfer surface (5) outside the heat spreader (4), and the heat spreader (4) There is a heat transfer medium flow path (6) for the heat transfer medium inside, and the heat conduction member (7) transfers the cold energy of the heat transfer medium flowing in the heat transfer medium flow path (6) of the heat exchanger (4) Or heat energy is transferred to each single cell (3) of the battery pack (2).

The single cells (3) constituting the battery pack (2) have a certain height (dimensions in the up-down direction in FIG. 1), a certain thickness (dimensions in the left-right direction in FIG. 1) and a certain width (dimensions in the left-right direction in FIG. 2). Flat square column, with a protruding upper end surface (9) (first end surface), lower end surface (11) (second end surface) and side surface (12) with a pair of terminals (8) protruding, the side surface (12) is defined by the thickness direction A pair of first vertical surfaces (12a) facing different directions (left-right direction in FIG. 1 ) and a pair of second vertical surfaces (12b) facing different directions (left-right direction in FIG. 2 ) in the width direction. All single cells (3) face the heat transfer surface (5) side of the heat exchanger (4) with one surface, that is, the lower end surface (11) and are spaced between the heat transfer surface (5) of the heat exchanger (4). The battery pack (2) is formed by connecting all the single cells (3) in series or in parallel by using the terminal (8) and stacking them in the thickness direction in a spaced state. Here, the lower end surface (11) of the unit cell (3) facing the heat spreader (4) side becomes the first heat receiving surface (13), and the side adjacent to the first heat receiving surface (13) (left side in FIG. 1 ) of the first vertical surface (12a) becomes the second heating surface (14).

The heat spreader (4) is formed in a flat shape using metal, such as aluminum, and has a certain height (dimensions in the vertical direction of FIG. 1), a certain length (dimensions in the left-right direction of FIG. direction), the upper surface becomes the heat transfer surface (5). The heat transfer medium flow path (6) extends in the longitudinal direction of the heat spreader (4), and is formed in parallel in the width direction of the heat spreader (4). A heat transfer medium that imparts cooling energy or heat energy to the cells (3) constituting the battery pack (2) flows through the heat transfer medium flow path (6).

The heat conduction member (7) is formed using a plate-shaped composite body (20) including a composite material formed by compounding aluminum and carbon particles, and is arranged for each unit cell (3). A thermally conductive part (7). The heat conduction member (7) consists of a first cell-side contact portion (15) in contact with the first heat-receiving surface (13) of each cell (3) facing the side of the heat spreader (4), and each cell (3) The second cell-side contact portion (16) that is in contact with the second heat-receiving surface (14) adjacent to the first heat-receiving surface (13), and between the two cell-side contact portions (15) (16) from each The single cell (3) is provided so as to protrude toward the side of the heat spreader (4) and constitutes a heat spreader side contact portion (17) which is in contact with the heat transfer surface (5) of the heat spreader (4). The second cell-side contact portion (16) of the other heat-conducting member (7) except the heat-conducting member (7) at one end is arranged on the two adjacent cells (3) of the battery pack (2). 1 Between the vertical planes (12a). The first cell side contact portion (15) of the heat conduction member (7) and the heat exchanger side contact portion (17) are connected through the first connecting portion (18) integrated with both, and the second contact portion of the heat conduction member (7) The cell side contact part (16) and the heat exchanger side contact part (17) are connected through the second connection part (19) integrated with both, and the first cell side contact part (15), the first connection part (18) and the second connecting portion (19) form a deformation portion (10), the deformation portion (10) has spring elasticity, and is subjected to the first heat receiving surface (13) of the single cell (3) and the heat spreader (4 ) Elastic deformation occurs when the heat transfer surface (5) approaches the force in the up and down direction. The first connection part (18), the second connection part (19) and the heat exchanger side contact part (17) form a substantially V-shape with the heat exchanger side contact part (17) as an apex.

As shown in Figure 3, the complex (20) forming the heat conduction part (7) is composed of a plate-shaped composite material (21) and an aluminum main surface skin layer (24), and the composite material (21) includes an aluminum matrix (22 ) and carbon particles (23) dispersed in the aluminum matrix (22), the main surface skin layer (24) covers the two main surfaces (21a) facing opposite sides of the composite material (21). The composite material (21) is formed by combining aluminum and carbon particles (23).

The composite material (21) is provided with a plurality of carbon particle dispersion layers (25) in which carbon particles (23) are dispersed in the planar direction in the aluminum material constituting the aluminum matrix (22) in a laminated form, and the aluminum matrix (22) is composed of A plurality of aluminum layers (26) formed of aluminum material.

The carbon particle dispersion layer (25) and the aluminum layer (26) are arranged in an alternate lamination state throughout the entire thickness direction of the composite material (21), so that the aluminum layer (26) exists at the lower end of the upper and lower ends, and the carbon layer exists at the upper end. The particles are arranged in the form of a dispersion layer (25). In each carbon particle dispersion layer (25), carbon particles (23) are dispersed in the aluminum matrix (22) along the plane direction of the composite material (21), and hardly dispersed in the thickness direction of the composite material (21). Carbon particles (23) do not substantially exist in each aluminum layer (26). The plurality of carbon particle dispersed layers ( 25 ) and the plurality of aluminum layers ( 26 ) are bonded and integrated by, for example, sintering and compositing. The thickness of the carbon particle dispersed layer (25) is not limited, but is preferably 1 to 100 μm. The thickness of the aluminum layer (26) is not limited, but is preferably 5 to 200 μm.

The main surface skin layer ( 24 ) of the composite body ( 20 ) is composed of an aluminum plate ( 27 ) formed separately from the composite material ( 21 ) and integrated with the composite material ( 21 ), for example, by sintering. That is, the main surface skin layer (24) on the upper side of FIG. The layer (26) is bonded and integrated. Furthermore, the lower main surface skin layer (24) is not essential.

The type of carbon particles used in the composite material (21) is not limited, but it is preferable to use carbon particles having as high thermal conductivity as possible, that is, carbon particles with high thermal conductivity. In particular, natural graphite particles and artificial graphite particles are preferably used as carbon particles. As the natural graphite particles, flaky graphite particles and the like are used. As the artificial graphite particles, isotropic graphite particles, anisotropic graphite particles, pyrolytic graphite particles, and the like are used. When the carbon particles are natural graphite particles and artificial graphite particles, it is preferable to use natural graphite particles and artificial graphite particles having an average particle diameter of not less than 10 μm and not more than 3 mm.

In addition, as the carbon particles of the composite material (21), at least one selected from carbon fibers, carbon nanotubes, and graphene may also be used. As the carbon fibers, pitch-based carbon fibers, PAN-based carbon fibers, and the like are used. As the carbon nanotubes, single-walled carbon nanotubes, multiwalled carbon nanotubes, vapor grown carbon fibers (VGCF (registered trademark)) and the like are used. When the carbon particles are carbon fibers, it is particularly preferable to use short carbon fibers having an average fiber length of not less than 10 μm and not more than 2 mm. When the carbon particles are carbon nanotubes, it is particularly preferable to use carbon nanotubes having an average length of not less than 1 μm and not more than 10 μm.

Not shown, the manufacturing method of the composite (20) includes the following steps: apply the coating liquid to one side of the aluminum foil made of the material constituting the aluminum matrix (22), and obtain the coated foil with the carbon particle layer formed thereon. Process; Process of forming a laminated body in which a plurality of coated foils are laminated with carbon particle layers facing the same direction; Coated foil in which the carbon particle layer in the aluminum foil is positioned at one end of the laminated body in the stacking direction and faces outward On the carbon particle layer of the laminated body, the aluminum plate (27) that becomes one main surface skin layer (24) is laminated, and is positioned at the other end of the stacking direction of the laminated body and does not set the surface of the side of the carbon particle layer in the aluminum foil , the process of laminating the aluminum plate (27) that becomes the other main surface skin layer (24); A process of heating and sintering in a sintering atmosphere (such as a non-oxidizing atmosphere), thereby sintering and integrating a plurality of coated foils, and sintering and integrating two aluminum plates (27) with the coated foils.

The coating solution contains carbon particles (23), a binder, and a solvent for the binder in a mixed state. For example, the carbon particles (23), the binder, and the solvent can be stirred and mixed by a stirring mixer in a mixing container. And get. In addition, a dispersant, a surface conditioner, etc. can be added to a coating liquid as needed.

The binder is used to give the carbon particles (23) adhesion to one side of the aluminum foil, and to suppress the carbon particles (23) from falling off from the aluminum foil. The binder is usually made of resin such as organic resin. Specifically, polyethylene oxide, polyvinyl alcohol, acrylic resin, or the like can be used as the binder.

Solvents are used to dissolve the adhesive. Specifically, as a solvent, a hydrophilic solvent (for example, isopropanol, water), an organic solvent, or the like can be used.

As the stirring mixer, a disperser, a planetary mixer, a bead mill, or the like can be used.

The sintering method of the laminated body and the two aluminum plates (27) can be selected from vacuum hot pressing method, spark plasma sintering method (SPS method), hot isostatic pressing sintering method (HIP method), extrusion method, calendering method, etc. . In addition, the spark plasma sintering method is also called a pulse energization sintering method.

The binder present in the laminated body disappears by sublimation or dispersion in the middle of heating the laminated body in such a manner that the temperature of the laminated body rises from approximately room temperature to the sintering temperature of the laminated body in this step, and is removed from the laminated body. remove.

In the step of sintering the laminated body and the two aluminum plates (27), the laminated body is heated as described above, and a part of the metal material of the aluminum foil penetrates into the carbon particle layer and fills fine voids (such as In the gap between the carbon particles (23) in the carbon particle layer), the gap is almost eliminated. As a result, the density of the composite material (21) increases, and the strength of the composite material (21) increases.

In addition, a part of the material constituting the aluminum foil permeates into the carbon particle layer, so that the carbon particles (23) in the carbon particle layer become along the aluminum matrix (22) of the composite material (21) of the obtained composite (20). In the state of being dispersed in the plane direction, the carbon particle layer becomes the carbon particle dispersed layer (25) of the composite material (21), and the aluminum foil becomes the aluminum layer (26) of the composite material (21). In addition, the aluminum plate (27) becomes the main surface skin layer (24).

Therefore, in the composite material (21), the carbon particle dispersed layers (25) and the aluminum layers (26) are arranged in a state of being alternately laminated throughout the entire thickness direction of the composite material (21) as described above. In this way a complex (20) is produced.

The composite (20) comprising the above composite material (21) is excellent in thermal conductivity. By laminating the resin film layer on the composite (20), the insulation, puncture resistance, corrosion resistance, abrasion resistance, water resistance (moisture resistance), chemical resistance, and scratch resistance of the thermally conductive member can be improved. , Improve dust resistance, and impart sufficient bending strength and spring elasticity. In the present invention, it is preferable to use a laminated material in which single or multiple resin film layers are bonded to both surfaces of the composite ( 20 ) by means of an adhesive layer as the thermally conductive member. In addition, the composite body (20) in Fig. 3 has aluminum main surface skin layers (24) on both sides of the aluminum-carbon composite material (21), but the composite body can also be changed to only one side of the composite material (21) A composite body with a main surface skin layer (24), or a composite body consisting of individual materials of the composite material (21).

Hereinafter, two embodiments of the laminated material will be described in detail with reference to FIGS. 6 and 7 .

Fig. 6 shows a first embodiment of the laminated material. The laminated material (51) is laminated with the first resin film layer (71) bonded by the first adhesive layer (61) on the first surface of the composite body (20), and laminated with the second adhesive layer on the second surface. (62) The joined second resin film layer (72). The first resin film layer (71) and the second resin film layer (72) are not limited to the same type of resin film layer, and may be different types of resin film layers.

Fig. 7 shows a second embodiment of the laminated material. The laminated material (52) is laminated with multiple resin film layers on both sides of the composite body (20). That is, the first resin film layer (71) joined by the first adhesive layer (61) is laminated on the first surface of the composite (20), and the outer surface of the first resin film layer (71) is formed by A third resin film layer (73) of a different type from the first resin film layer is bonded to the third adhesive layer (63). In addition, a second resin film layer (72) joined by a second adhesive layer (62) is laminated on the second surface of the composite (20), and the outer surface of the second resin film layer (72) is formed by A fourth resin film layer (74) of a different type from the second resin film layer (72) is bonded to the fourth adhesive layer (64). The first resin film layer (71) and the second resin film layer (73) may be the same type of resin film layer, or may be different types of resin film layers. Similarly, the third resin film layer (73) and the fourth resin film layer (74) may be the same type of resin film layer, or may be different types of resin film layers. In addition, the multilayer film layer may be three or more layers. Moreover, the case where the lamination|stacking number of the resin film layer of the 1st surface side and the resin film layer of the 2nd surface side differs also is contained in the technical scope of this invention.

In the present utility model, there is no particular limitation as the first resin film layer (71), the second resin film layer (72), the third resin film layer (73) and the fourth resin film layer (74), for example, Examples include polyethylene terephthalate (PET) film, nylon film (of which biaxially stretched nylon film is preferred), polystyrene (PS) film, polyethylene (PE) film, polypropylene (PP) film , Polyethylene naphthalate (PEN) film, polyimide (PI) film, polycarbonate (PC) film, acrylic resin film, epoxy resin film, etc. By laminating these resin films on a composite, the insulation, puncture resistance, corrosion resistance, abrasion resistance, water resistance (moisture resistance), chemical resistance, scratch resistance, and dust resistance of thermally conductive parts can be improved. Improve, and give sufficient bending strength and spring elasticity. In addition, in the case of the laminated resin films shown in FIG. 7, it is preferable to combine resin films having different properties. For example, nylon film has better puncture resistance than other films but slightly higher hygroscopicity. Therefore, by combining a polyethylene terephthalate film with high water resistance (moisture resistance), it is possible to provide both resin films for thermally conductive parts. excellent characteristics. In addition, when a nylon film and a polyethylene terephthalate film are laminated, it is preferable to use a nylon film as the first resin film layer (71) and the second resin film layer (72) on the side of the laminate (20). A polyethylene terephthalate film excellent in water resistance is used as the third resin film layer (73) and the fourth resin film layer (74) exposed outside.

The thicknesses of the first resin film layer (71), the second resin film layer (72), the third resin film layer (73) and the fourth resin film layer (74) are all preferably set in the range of 5 μm to 200 μm, Among them, 10 μm to 50 μm is particularly preferable.

The adhesive for forming the first adhesive layer (61), second adhesive layer (62), third adhesive layer (63) and fourth adhesive layer (64) is not particularly limited, for example, Polyurethane-based resins, olefin-based resins, ethylene-ethyl acetate copolymers (EVA), ethylene-acrylate copolymers, ethylene-methacrylate copolymers, etc., and other CPP (cast polypropylene) can also be used. Among them, polyurethane-based resins are preferably used, and in this case, high joint strength can be ensured regardless of the resin type of the resin film layer. In addition, since the urethane resin-based adhesive is offset, it is also advantageous in terms of cost.

The lamination method in the case of lamination using the above-mentioned adhesive is not particularly limited in the case of a wet method, and examples thereof include dip coating, spin coating, gravure printing, die coating, knife coating, 3-roll (offset type), and slit coating Cloth, roll coating (2 rolls), spray coating, curtain coating, reverse roll coating, comma coating and other coating methods. Moreover, it does not specifically limit in the case of a dry method, For example, a dry lamination method, a thermal lamination method, a hot rolling method, etc. are mentioned.

In the battery pack device (1) described above, when cooling all the cells (3) constituting the battery pack (2), cooling liquid is supplied to the heat medium flow path (6) of the heat spreader (4). In this way, when the cooling liquid flows through the heat transfer medium passage (6) of the heat transfer device (4), the cold energy of the cooling liquid passes through the heat transfer side contact part (17) of the heat transfer member (7), the first The connection part (18) and the first cell side contact part (15) are transmitted to the first heat receiving surface (13) of the cell (3), and through the heat transfer part (17) of the heat conduction member (7), The second connection part (19) and the second cell side contact part (16) are transmitted to the second heat receiving surface (14) of the cell (3), and all the cells (3) of the battery pack (2) are cooled.

In the cold region, when it is necessary to heat the single cell (3) to an appropriate temperature before starting to use, the high-temperature heating liquid, which is a heat transfer medium capable of supplying heat energy, is directed to the heat transfer medium flow path of the heat exchanger (4) ( 6) Supply. In this way, when the heating liquid flows through the heat transfer medium flow path (6) of the heat exchanger (4), the thermal energy of the heating liquid is transferred to the cells (3) of the battery pack (2) in the same manner as in the case of cooling. All single cells (3) of the battery pack (2) are heated to an appropriate temperature on the two heating surfaces (13) (14).

As shown in Fig. 1, when at least a part of the single cells (3) are shifted and dislocated in the vertical direction and a level difference is generated on the lower surface of the battery pack (2), the deformation part (10) of the heat conduction member (7) follows the battery pack The shape of the lower surface of (2) is elastically deformed to prevent the first heat receiving surface (13) of each unit cell (3) of the battery pack (2) from contacting the first unit cell side (15) of the heat conduction member (7). ) and between the heat transfer side contact portion (17) of the heat conduction member (7) and the heat transfer surface (5) of the heat transfer device (4). Therefore, all the cells (3) constituting the battery pack (2) can be efficiently cooled or heated.

FIG. 4 shows another embodiment of the battery pack device of the present invention.

In the battery pack device (30) shown in Fig. 4, two second vertical surfaces (12b) on the side surfaces (12) of the single cells (3) of the battery pack (2) serve as second heat receiving surfaces (14), respectively. Two heat conduction members (7) are arranged for each unit cell (3), and are in contact with two heat conduction members on the left and right sides of the first heat receiving surface (13) of each unit cell (3) in FIG. 4 . The first cell side contact portion (15) of (7) is in contact with the second cell side contact portion (16) of one heat conducting member (7) on the two second heat receiving surfaces (14). That is, the first cell-side contact portion (15) of the heat conduction member (7) on the left side of FIG. 4 is in contact with each cell (3) on the left side of FIG. The second heat receiving surface (14) on the left side of Fig. 4 of each cell (3) is in surface contact, and the first cell side contact part (15) of the heat conduction member (7) on the right side of Fig. 4 is in contact with each cell (3) ), and the second cell-side contact portion (16) is in surface contact with the second heating surface (14) on the right side of FIG. 4 of each cell (3).

Other configurations of the battery pack device (30) are the same as those of the battery pack device (1) shown in Figs. 1 to 3 .

FIG. 5 shows another embodiment of the battery pack device of the present invention.

In the battery pack device (40) shown in Fig. 5, the heat spreader (4) has two heat transfer surfaces (5) facing opposite sides (upper and lower sides of Fig. 5 ), and on both sides of the heat spreader (4) The battery packs (2) are respectively arranged on the sides. In addition, among the side surfaces (12) of the unit cells (3) of each battery pack (2), the second vertical surface (12b) facing the side of the heat transfer surface (5) of the heat spreader (4) (the upper side in FIG. 5 The second vertical surface (12b) facing downward in the single cell (3) of the battery pack (2) in the battery pack (2), the second vertical face (12b) facing upward in the single cell (3) of the battery pack (2) on the lower side of the figure )) respectively become the first heating surface (13), and the first vertical surface (12a) adjacent to the first heating surface (13) (right side in Fig. 5) becomes the second heating surface (14).

One heat conduction member (7) is provided for each single battery (3) of the two battery packs (2). The heat conduction member (7) consists of a first cell-side contact portion (15) in contact with the first heat-receiving surface (13) of each cell (3) facing the side of the heat spreader (4), and each cell (3) The second cell-side contact portion (16) that is in contact with the second heat-receiving surface (14) adjacent to the first heat-receiving surface (13), and between the two cell-side contact portions (15) (16) from each The single cell (3) is provided so as to protrude toward the side of the heat spreader (4) and constitutes a heat spreader side contact portion (17) which is in contact with the heat transfer surface (5) of the heat spreader (4). The second cell-side contact portion (16) of the other heat-conducting member (7) except the heat-conducting member (7) at one end is arranged on the two adjacent cells (3) of the battery pack (2). 1 Between the vertical planes (12a).

Other configurations of the battery pack device (40) are the same as those of the battery pack device (1) shown in Figs. 1 to 3 .

industry availability

The battery pack device of the present invention is preferably used for a battery pack composed of, for example, a lithium secondary battery.

Claims (10)

1. A battery pack device comprising a battery pack, a heat spreader and a heat conduction member, The battery pack is composed of a plurality of square cells, The heat transfer device has a heat transfer surface on the outside and a heat transfer medium flow path through which the heat transfer medium flows inside, The heat conduction member transfers the cold energy or heat energy of the heat transfer medium flowing in the heat transfer medium flow path of the heat exchanger to each unit cell of the battery pack, The battery pack device is characterized in that All the single cells constituting the battery pack are stacked with one side facing the heat transfer surface side of the heat spreader and spaced from the heat transfer surface of the heat spreader, The heat conduction member is composed of a first cell-side contact, a second cell-side contact, and a heat spreader-side contact, The first cell-side contact portion is in contact with the first heat-receiving surface of the cell facing the heat exchanger, The second cell-side contact portion is in contact with a second heat-receiving surface adjacent to the first heat-receiving surface of the cell, The heat spreader side contact portion is provided between the two single cell side contact portions in a manner protruding from the single cell toward the heat spreader side, and is in contact with the heat transfer surface of the heat spreader, The first cell-side contact portion and the heat exchanger-side contact portion of the heat conduction member are connected by a first connection portion integrated with both, The second cell-side contact portion and the heat exchanger-side contact portion of the heat conduction member are connected by a second connection portion integrated with both, The deformation part is formed by the first cell-side contact part, the first connection part and the second connection part, and the deformation part has spring elasticity, and is subjected to heat transfer between the first heat receiving surface of the cell and the heat spreader. Elastic deformation occurs when the surface approaches the force. 2. The battery pack device according to claim 1, wherein: A substantially V-shaped deformed portion with the heat spreader-side contact portion as an apex is formed by the first connection portion, the second connection portion, and the heat spreader-side contact portion of the heat conduction member. 3. The battery pack device according to claim 1 or 2, wherein: In the single cells of the battery pack, the second end surface opposite to the first end surface provided with the terminal faces the heat transfer surface side of the heat exchanger, The second end surface of the unit cell becomes the first heating surface, any one of the two faces paired in the stacking direction among the side faces of the cells serves as the second heat receiving face, Each cell is equipped with a heat conduction part, The second battery-side contact portions of the other heat-conducting members other than the heat-conducting member at one end are disposed between adjacent battery cells of the battery pack. 4. The battery pack device according to claim 1 or 2, wherein: In the single cells of the battery pack, the second end surface on the opposite side to the first end surface provided with the terminal faces the heat transfer surface side of the heat exchanger, The second end surface of the unit cell becomes the first heating surface, Among the side surfaces of the single cells, two surfaces that are paired in a direction perpendicular to the stacking direction serve as the second heat receiving surfaces, Each cell is equipped with two heat conduction parts, The first cell side contact portions of the two heat conduction members are in contact with the first heat receiving surface of each cell, and the second cell side contact portions of the two heat conduction members are in contact with the second heat receiving surface of each cell. 5. The battery pack device according to claim 1 or 2, wherein: Among the side surfaces of the single cells of the battery pack, any one of the two faces that are paired in a direction perpendicular to the stacking direction serves as the first heat receiving face, any one of the two faces paired in the stacking direction among the side faces of the cells serves as the second heat receiving face, Each cell is equipped with a heat conduction part, The second battery-side contacts of the other heat-conducting members other than the heat-conducting member at one end are disposed between adjacent battery cells of the battery pack. 6. The battery pack device according to claim 1 or 2, wherein: The heat spreader has a heat transfer surface, The battery pack is arranged only on the heat transfer surface side of the heat transfer device. 7. The battery pack device according to claim 1 or 2, wherein The heat spreader has two heat transfer faces facing opposite sides of each other, Battery packs are arranged on both sides of the heat spreader. 8. The battery pack device according to claim 1 or 2, wherein: The heat conduction member has a multilayer structure in which carbon particle dispersion layers and aluminum layers are alternately laminated, The carbon particle dispersion layer is formed by dispersing carbon particles in an aluminum material. 9. The battery pack device according to claim 1 or 2, wherein The heat conduction member is a laminated material in which a single or multiple resin film layers are bonded to both surfaces of the composite body via an adhesive layer. 10. The battery pack device according to claim 9, wherein: The resin film layer is a multilayer resin film layer of polyethylene terephthalate film and nylon film, The nylon film is disposed on the complex side.