JP2021099940A - Cell unit, battery including the same, and manufacturing method of the same - Google Patents

Abstract

To provide a cell unit, a battery including the same, and a manufacturing method of the same, which reduce heat conduction between a plurality of heat sources and increase the heat transfer efficiency from the heat sources to a cooling portion.SOLUTION: A cell unit 1 includes a plurality of cells 50, a multilayer sheet 10 disposed at least between the cells 50, and a heat-dissipating structure 30 provided with a plurality of heat-dissipating members 20 disposed at least at one end of the cells 50, the heat-dissipating members 20 increasing the heat dissipation from the cells 50. The multilayer sheet 10 includes a rubber sheet, a heat insulating sheet that is laminated on both sides thereof and capable of reducing the heat transfer between adjacent cells 50, and a first heat conduction sheet that is laminated on the outside thereof and has excellent thermal conductivity. The heat-dissipating members 20 are long members in contact with at least one end of the cells 50 and have a second heat conduction sheet covering their outer surface.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cell unit, a battery including the cell unit, and a method for manufacturing the battery.

Currently, there are active movements around the world to gradually convert conventional gasoline-powered vehicles or diesel-powered vehicles to electric vehicles in order to reduce the burden on the global environment. In particular, electric vehicles are becoming more widespread in China as well as in European countries such as France, the Netherlands, and Germany. The spread of electric vehicles has issues such as the development of high-performance batteries and the installation of a large number of charging stations. In particular, technological development for enhancing the charge / discharge function of lithium-based automobile batteries has become a major issue. It is well known that the above-mentioned automobile battery cannot fully exert its charge / discharge function at a high temperature of 60 degrees Celsius or higher. For this reason, it is important to improve the heat dissipation of the battery as well as the circuit board described above.

In order to promote heat transfer from a heat source such as a battery to a coolant, it is necessary to form a heat transfer path with a material having high thermal conductivity and reduce the thermal resistance between the heat source and the material having high thermal conductivity. You will need it. For example, as a structure that promotes heat transfer from a heat source to a coolant, a water-cooled pipe is arranged in a metal housing having excellent thermal conductivity such as aluminum, and a battery cell (simply referred to as a "cell") is used. A structure in which an adhesive rubber sheet is sandwiched between the bottom surface of the housing is adopted. In a battery having such a structure, the cell transfers heat to the housing through a rubber sheet and is effectively removed by water cooling.

On the other hand, various batteries such as automobile batteries may cause thermal runaway due to an internal short circuit or the like, resulting in abnormal heat generation or ignition. In recent years, as an automobile battery, a battery in which a plurality of cells are arranged side by side in a housing is known. In a battery in which a plurality of cells are mounted side by side, when abnormal heat generation or ignition occurs in one cell, heat is transferred to surrounding cells, which causes further problems such as ignition, smoking, and explosion. There is a risk. In order to minimize the damage caused by such a defect, a method of making it difficult to transfer the heat of the cell having an abnormally high temperature to the surrounding cells is being studied. For example, a refractory material or a heat insulating layer between a plurality of cells is being studied. Etc. are known (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2018-20604

However, in the conventional battery as described above, since the rubber sheet has lower thermal conductivity than aluminum or graphite, it is difficult to efficiently transfer heat from the cell to the housing. A method of sandwiching a spacer such as graphite instead of the rubber sheet is also conceivable, but a gap is generated between the cell and the spacer, and the heat transfer efficiency is lowered. Further, as described above, it is necessary to suppress heat transfer between cells at the time of abnormally high temperature or ignition of cells. On the other hand, it is desired to improve the heat transfer efficiency from a heat source such as a cell to a cooling portion in normal times other than abnormally high temperature of the cell or ignition.

The present invention has been made in view of the above problems, and includes a cell unit capable of reducing heat conduction between a plurality of cells and increasing the heat transfer efficiency from the cell to the cooling portion. It is an object of the present invention to provide a battery and a method for manufacturing the battery.

(1) The cell unit according to the embodiment for achieving the above object includes a cell as a plurality of heat sources, a multilayer sheet arranged at least between the plurality of cells, and at least one end of the cell. A cell unit including a heat radiating structure provided in a portion and provided with a plurality of heat radiating members for enhancing heat radiating from the cell, wherein the multilayer sheet is a rubber sheet made of a rubber-like elastic body and the rubber. A heat insulating sheet that is continuously or separately laminated on both sides of the sheet and can reduce heat conduction between a plurality of adjacent cells, and a rubber sheet that is separated and laminated on the outside of the heat insulating sheet. A first heat conductive sheet containing at least one of metal, carbon, or ceramics, which is more excellent in heat conductivity than the heat insulating sheet, and the heat radiating member is at least one end of the cell. It is a long member that comes into contact with the water, and includes a second heat conductive sheet that covers the outer surface thereof.

(2) In the cell unit according to another embodiment, the heat radiating member is preferably a tubular member having a hollow portion along the length direction thereof.

(3) In the cell unit according to another embodiment, preferably, the heat radiating member is a member provided inside the second heat conductive sheet, and is a cushion that is more easily deformed than the second heat conductive sheet. It is equipped with a member.

(4) In the cell unit according to another embodiment, preferably, the heat radiating member has a hollow portion along the length direction thereof, and the cushion member has the hollow portion long in the length direction of the heat radiating member. It is a tubular cushion member provided, and the second heat conductive sheet is spirally wound in the length direction of the cushion member.

(5) In the cell unit according to another embodiment, preferably, the second heat conductive sheet and the cushion member have a form in which the second heat conductive sheet and the cushion member integrally travel in one direction in a spiral shape.

(6) In the cell unit according to another embodiment, preferably, the heat radiating structure is connected by a connecting member in a state where a plurality of the heat radiating members are arranged in a direction orthogonal to the length direction thereof.

(7) In the cell unit according to another embodiment, preferably, the heat radiating structure is formed by the connecting member in a state where the plurality of the heat radiating members are arranged in a direction orthogonal to the direction in which the plurality of cells are arranged. It is connected.

(8) In the cell unit according to another embodiment, preferably, the heat insulating sheet is a sheet containing silica airgel.

(9) In the cell unit according to another embodiment, the rubber sheet is preferably a sheet containing silicone rubber.

(10) The cell unit according to another embodiment preferably has a heat conductive oil on the surface of the second heat conductive sheet for increasing the heat conductivity from the cell in contact with the surface to the surface. Have.

(11) In the cell unit according to another embodiment, preferably, the thermally conductive oil has higher thermal conductivity than the silicone oil and the silicone oil, and is composed of one or more of metal, ceramics or carbon. Includes with filler.

(12) The battery according to the embodiment includes any one of the above cell units in a housing having a structure for flowing a coolant.

(13) The method for manufacturing a battery according to an embodiment is the method for manufacturing a battery described above, and is a laminating step of producing a cell unit with a film in which an auxiliary film is laminated on the heat radiating structure of the cell unit. An insertion step of inserting the cell unit with a film into the housing so that the cooling portion through which the coolant flows in the housing and the heat radiating structure are brought into close contact with each other via the auxiliary film, and the housing. It has a pull-out step of pulling out the auxiliary film from the air and bringing the heat-dissipating structure into contact with the cooling portion.

According to the present invention, there is provided a cell unit capable of reducing heat conduction between a plurality of cells and increasing heat transfer efficiency from the cell to a cooling portion, a battery including the cell unit, and a method for manufacturing the battery. it can.

FIG. 1 shows a perspective view of a cell unit according to the present embodiment. FIG. 2 shows a partially exploded perspective view of the cell stack constituting the cell unit according to the present embodiment. FIG. 3 shows a perspective view of the multilayer sheet constituting the cell unit according to the present embodiment and an enlarged view of a part A thereof. FIG. 4 shows a plan view (4A) of the heat radiating structure constituting the cell unit according to the present embodiment, a sectional view taken along line BB (4B) in the (4A), and a region C in the sectional view. An enlarged view (4C) is shown respectively. FIG. 5 shows a diagram for explaining a manufacturing process of a heat radiating member constituting the heat radiating structure. FIG. 6 shows a diagram for explaining a suitable manufacturing process of a modified example of the heat radiating structure. FIG. 7 shows a perspective view of the battery according to the present embodiment. FIG. 8 shows a flowchart including the main steps of the battery manufacturing method according to the present embodiment. 9A and 9B show the main steps of the battery manufacturing method according to the present embodiment, respectively. 10A and 10B show the main steps of the battery manufacturing method according to the present embodiment, respectively.

Next, each embodiment of the present invention will be described with reference to the drawings. It should be noted that each of the embodiments described below does not limit the invention according to the claims, and all of the elements and combinations thereof described in each embodiment are the means for solving the present invention. Is not always required.

1. 1. Cell unit FIG. 1 shows a perspective view of a cell unit according to the present embodiment.

(1) Schematic configuration of cell unit The cell unit 1 according to the present embodiment is preferably arranged at least between a battery cell (hereinafter, referred to as “cell”) 50 as a plurality of heat sources and a plurality of cells 50. The multilayer sheet 10 is provided, and a heat radiating structure 30 which is arranged at at least one end of the cell 50 and includes a plurality of heat radiating members 20 for enhancing heat radiating from the cell 50. The cell unit 1 preferably further includes a stack case 15. The stack case 15 is a case for accommodating a plurality of cells 50 and a multilayer sheet 10. The cell 50, the multilayer sheet 10, and the stack case 15 are elements constituting the cell stack 60 (see FIG. 2). Here, the cell unit 1 includes five cells 50, but the number of cells 50 provided in the cell unit 1 is not particularly limited. Further, the number of heat radiating members 20 constituting the heat radiating structure 30 provided in the cell unit 1 is also not particularly limited.

Next, each component of the cell unit 1 will be described.

(2) Cell Stack FIG. 2 shows a partially exploded perspective view of a cell stack constituting the cell unit according to the present embodiment.

As shown in FIG. 2, the cell stack 60 is a member in which a plurality of cells 50 and a multilayer sheet 10 arranged at least between the plurality of cells 50 are housed in a stack case 15. The stack case 15 preferably includes a case opening 17 provided on at least one surface (see FIG. 2). Therefore, the cell stack 60 is housed in the stack case 15 through the case opening 17 in a state where the plurality of cells 50 and the plurality of multilayer sheets 10 are laminated so that the multilayer sheets 10 sandwich both sides of the cell 50. The stack case 15 is preferably formed of a resin, metal, or the like, and more preferably made of a material that can withstand a temperature rise due to heat dissipation from the cell 50. The stack case 15 may be provided with a case opening 17 on a surface other than the upper surface on which the heat radiating structure 30 is placed, or may be provided with a plurality of case openings 17. Further, the stack case 15 may have a lid on the case opening 17. The form of the stack case 15 is not limited as long as the cell 50 and the multilayer sheet 10 can be accommodated, but the stack case 15 is preferably in a form in which the cell 50 and the multilayer sheet 10 can be accommodated in close contact with each other.

(3) Multi-layer sheet FIG. 3 shows a perspective view of the multi-layer sheet constituting the cell unit according to the present embodiment and an enlarged view of a part A thereof.

The multilayer sheet 10 is a sheet that is arranged at least between a plurality of (here, two) cells 50 and can conduct heat from the cells 50. The multilayer sheet 10 is laminated on both sides of the rubber sheet 13 continuously or separately, and can reduce heat conduction between a plurality of adjacent cells 50, and the heat insulating sheet 12 It is provided with a rubber sheet 13 and a first heat conductive sheet 11 which is separated and laminated on the outside of the surface and is superior in heat conductivity to the heat insulating sheet 12. Hereinafter, each component of the multilayer sheet 10 will be described.

(3-1) First Heat Conductive Sheet As shown in FIG. 3, the first heat conductive sheet 11 forms a sheet separately and laminated on the outside of the heat insulating sheet 12, that is, the outermost layer of the multilayer sheet 10. It is a sheet. The first heat conductive sheet 11 is preferably a sheet containing carbon, and more preferably 90% by mass or more of carbon. For example, a graphite film formed by firing a resin can be used for the first heat conductive sheet 11. However, the first heat conductive sheet 11 may be a sheet containing carbon and a resin. In that case, the resin may be a synthetic fiber, and in that case, an aramid fiber can be preferably used as the resin. The term "carbon" as used in the present application is broadly defined to include any structure composed of carbon (element symbol: C) such as graphite, carbon black having a lower crystallinity than graphite, diamond, and diamond-like carbon having a structure similar to diamond. Is interpreted as. In this embodiment, the first heat conductive sheet 11 can be a thin sheet obtained by curing a material obtained by blending and dispersing graphite fibers and carbon particles in a resin. The first heat conductive sheet 11 may be carbon fibers knitted in a mesh shape, and may be blended or knitted. Various fillers such as graphite fibers, carbon particles and carbon fibers are all included in the concept of carbon fillers.

When the first heat conductive sheet 11 is a sheet containing carbon and a resin, even if the resin exceeds 50% by mass or 50% by mass or less with respect to the total mass of the first heat conductive sheet 11. There may be. That is, it does not matter whether or not the first heat conductive sheet 11 uses resin as the main material as long as there is no major problem in heat conduction. As the resin, for example, a thermoplastic resin can be preferably used. As the thermoplastic resin, a resin having a high melting point that does not melt when conducting heat from a heat source is preferable, and for example, polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polyamideimide (PAI), and fragrance. Group polyamide (aramid fiber) and the like can be preferably mentioned. The resin is dispersed in the gaps between the carbon fillers, for example, in the form of particles or fibers in the state before molding of the first heat conductive sheet 11. In addition to the carbon filler and the resin, the first heat conductive sheet 11 may be dispersed with AlN or diamond as a filler for further enhancing the heat conduction. Further, instead of the resin, an elastomer that is more flexible than the resin may be used. The first heat conductive sheet 11 can also be a sheet containing metals and / or ceramics in place of or with carbon as described above. As the metal, those having relatively high thermal conductivity such as aluminum, copper, and alloys containing at least one of them can be selected. Further, as the ceramics, ceramics having _{relatively high thermal conductivity such as Al 2} O ₃ , AlN, cBN, and hBN can be selected.

It does not matter whether the first heat conductive sheet 11 is excellent in conductivity or not. The thermal conductivity of the first heat conductive sheet 11 is preferably 10 W / mK or more. In this embodiment, the first heat conductive sheet 11 is preferably a film made of graphite, and is made of a material having excellent heat conductivity and conductivity. The first heat conductive sheet 11 is preferably a sheet having excellent curvature (or flexibility), and the thickness thereof is not limited, but 0.02 to 3 mm is preferable, and 0.1 to 0.5 mm is more preferable. preferable. However, since the thermal conductivity of the first heat conductive sheet 11 decreases as the thickness increases, the thickness thereof is determined by comprehensively considering the strength, flexibility and heat conductivity of the sheet. Is preferable.
(3-2) Heat-insulating sheet As shown in FIG. 3, the heat-insulating sheet 12 is a sheet that is separated and laminated inside the first heat conductive sheet 11 and outside the rubber sheet 13. The heat insulating sheet 12 is preferably a silica airgel sheet in which a sheet-like fiber mass is used as a carrier and silica airgel is impregnated and supported. As the sheet-like fiber mass, glass fiber; silica fiber, alumina fiber, titania fiber, ceramic fiber such as silicon carbide fiber; metal fiber; artificial mineral fiber such as rock wool and basalt fiber; carbon fiber; whisker, etc. are used as the manufacturing method. It is possible to use a sheet-like molded product such as a non-woven fabric, a mat, or a felt, which is formed into a paper shape or a board shape, or is molded into a sheet shape by appropriately adding a binder. Of these, in order to effectively obtain the heat insulating effect of silica airgel, a carrier capable of maintaining the shape as a carrier even at a heat resistant temperature (about 750 ° C.) of silica airgel is more preferable. The porosity of the silica airgel is preferably 60% or more, more preferably 80% or more. The silica airgel may be simply impregnated and dispersed in the sheet-shaped fiber mass, or may be supported in the form of constituent fibers of the sheet-shaped fiber mass by using a binder or the like.

The thermal conductivity of the heat insulating sheet 12 is preferably 0.2 W / mk or less, more preferably 0.15 W / mK or less. The heat insulating sheet 12 exhibits excellent heat insulating properties due to the convection in the pores based on the carrier and the pores based on silica airgel and its low thermal conductivity. The thickness of the heat insulating sheet 12 is not limited, but is preferably 0.05 to 2 mm, more preferably 0.1 to 1.0 mm. However, the thinner the thickness of the heat insulating sheet 12, the smaller the amount of silica airgel supported, so that the heat insulating property is lowered. Therefore, it is preferable that the thickness of the heat insulating sheet 12 is determined by comprehensively considering the strength, flexibility and heat insulating property of the sheet. Further, as a heat insulating sheet 12, in addition to silica airgel, steatite (MgO · _SiO 2), zirconia _(ZrO 2), cordierite _{(2MgO · 2Al 2 O 3 ·} 5SiO 2), forsterite (2MgO · _SiO 2), or mullite sheet may be used with one or more of the _{(3Al 2 O 3 · 2SiO 2} ).

(3-3) Rubber Sheet As shown in FIG. 3, the rubber sheet 13 is a sheet that is laminated inside the heat insulating sheet 12, that is, is sandwiched between the heat insulating sheets 12. The rubber sheet 13 is a sheet made of a rubber-like elastic body. The word "elastic body" or "cushion member" may be used instead of the word "rubber-like elastic body". The rubber sheet 13 has a function of enhancing the adhesion between the heat source and the first heat conductive sheet 11 by exerting a cushioning property between the plurality of heat sources, and the load applied to the first heat conductive sheet 11 and the heat insulating sheet 12 causes the rubber sheet 13 to become the first. 1 It also functions as a protective member to prevent the heat conductive sheet 11 and the heat insulating sheet 12 from being damaged. The rubber sheet 13 is a member having a lower thermal conductivity than the first thermal conductive sheet 11.

The rubber sheet 13 may be either a sponge-like member having air bubbles inside or a rubber-like elastic body containing no air bubbles, but is more preferably a sponge-like member. The rubber sheet 13 is preferably a thermosetting elastomer such as silicone rubber, urethane rubber, isoprene rubber, ethylene propylene rubber, natural rubber, ethylene propylene diene rubber, nitrile rubber (NBR) or styrene butadiene rubber (SBR); urethane-based. , Ester-based, styrene-based, olefin-based, butadiene-based, fluorine-based and other thermoplastic elastomers, or composites thereof. The rubber sheet 13 is preferably made of a material having high heat resistance that can maintain its shape without being melted or decomposed by the heat transmitted through the first heat conductive sheet 11 and the heat insulating sheet 12. In this embodiment, the rubber sheet 13 is more preferably a silicone sponge sheet which is a foam sheet of silicone rubber. _{The rubber sheet 13 may be configured by dispersing fillers typified by Al 2} O ₃ , AlN, cBN, hBN, diamond particles, etc. in the rubber in order to increase the thermal conductivity as much as possible.

The first heat conductive sheet 11, the heat insulating sheet 12, and the rubber sheet 13 may be fixed by using a fixing means such as a heat-resistant adhesive or double-sided tape, or may be fixed without using any fixing means. Is also good.

(4) Heat Dissipation Structure FIG. 4 shows a plan view (4A) of a heat dissipation structure constituting the cell unit according to the present embodiment, a sectional view taken along line BB (4B) in the (4A), and a cross section thereof. An enlarged view (4C) of the area C in the figure is shown.

The heat radiating structure 30 is preferably connected by the connecting member 25 in a state where a plurality of heat radiating members 20 are arranged in a direction orthogonal to the length direction thereof (see FIG. 4). Further, the heat radiating structure 30 is preferably connected by the connecting member 25 in a state where the plurality of heat radiating members 20 are arranged in a direction orthogonal to the direction in which the plurality of cells 50 are arranged (see FIG. 1).

The heat radiating member 20 is a long member that contacts at least one end of the cell 50, and includes a second heat conductive sheet 21 that covers the outer surface thereof. Further, the heat radiating member 20 is preferably a tubular member having a hollow portion 23 along the length direction thereof, and is a member provided inside the second heat conductive sheet 21, and is a second heat conductive sheet 21. A cushion member 22 that is more easily deformed than the above is provided. The cushion member 22 is preferably a tubular cushion member including a hollow portion 23 that is long in the length direction of the heat radiating member 20. The second heat conductive sheet 21 is preferably wound in a spiral shape in the length direction of the cushion member 22. The heat radiating structure 30 preferably has a heat conductive oil on the surface of the second heat conductive sheet 21 for increasing the heat conductivity from the cell 50 in contact with the surface to the surface. The plurality of heat radiating members 20 constituting the heat radiating structure 30 have a substantially cylindrical shape when not pressed by the cell 50, but when the cell 50 is pressed, the heat radiating member 20 is compressed and flattened by the pressure. become. In the present application, the "cross section" or "longitudinal cross section" is a direction in which one heat radiation structure 30 is vertically cut into the other heat radiation structure 30 along a direction orthogonal to the direction in which the cells 50 are arranged. Means a cross section. Hereinafter, each component of the heat dissipation structure 30 will be described.

(4-1) Second Heat Conductive Sheet The second heat conductive sheet 21 is a sheet that covers the outer surface of the heat radiating member 20. Like the first heat conductive sheet 11, the second heat conductive sheet 21 is preferably a sheet containing carbon, and more preferably 90% by mass or more of carbon. Since the second heat conductive sheet 21 has the same configuration as the first heat conductive sheet 11, detailed description thereof will be omitted. The thickness of the second heat conductive sheet 21 is not limited, but is preferably 0.02 to 3 mm, more preferably 0.03 to 0.5 mm. However, since the thermal conductivity of the second heat conductive sheet 21 decreases as the thickness increases, the thickness thereof is determined by comprehensively considering the strength, flexibility and heat conductivity of the sheet. Is preferable. The width and length of the second heat conductive sheet 21 are not particularly limited, and the outer surface of the cushion member 22 is wound and advanced in the length direction of the cushion member 22, and the entire surface or most of the outer surface is covered. Any width and length that can be covered will do.

(4-2) Cushion member The important functions of the cushion member 22 are deformability and resilience. The resilience depends on the elastic deformability of the cushion member 22. Deformability is a characteristic required to follow the shape of the heat source, especially in the case of a battery cell that contains semi-solid materials such as lithium-ion batteries and contents that also have liquid properties in a easily deformable package. In many cases, the design dimensions are irregular or the dimensional accuracy cannot be improved. Therefore, it is important to maintain the deformability of the cushion member 22 and the resilience for maintaining the following force.

The cushion member 22 is a long solid or hollow member, and is preferably a tubular member (also referred to as a tubular cushion member) having a hollow portion 23 that is long in the length direction of the heat radiating member 20. However, the cushion member 22 does not include the hollow portion 23, and may be a solid member, for example, a columnar member. In this embodiment, the hollow portion 23 penetrates in the length direction of the cushion member 22. However, at least one of both ends of the hollow portion 23 in the length direction may be closed. When both ends of the hollow portion 23 are closed, a closed hollow region is formed in the cushion member 22.

The cushion member 22 has a function of improving the contact between the second heat conductive sheet 21 and the heat source even when the heat source in contact with the heat radiating member 20 is not flat. Further, the hollow portion 23 facilitates the deformation of the cushion member 22, and in addition contributes to the weight reduction of the heat radiating structure 30. The cushion member 22 also has a function as a protective member for preventing the second heat conductive sheet 21 from being damaged by a load applied to the second heat conductive sheet 21 from a heat source or the like. The cushion member 22 is more easily elastically deformed than the second heat conductive sheet 21, and is less likely to crack or crack due to deformation due to pressing from a heat source or the like and its release. Therefore, the cushion member 22 can suppress the situation where the second heat conductive sheet 21 is cracked. In this embodiment, the cushion member 22 is a member having a lower thermal conductivity than the second thermal conductive sheet 21.

The cushion member 22 is preferably a thermosetting elastomer such as silicone rubber, urethane rubber, isoprene rubber, ethylene propylene rubber, natural rubber, ethylene propylene diene rubber, nitrile rubber (NBR) or styrene butadiene rubber (SBR); urethane-based , Ester-based, styrene-based, olefin-based, butadiene-based, fluorine-based and other thermoplastic elastomers, or composites thereof. The cushion member 22 is preferably made of a material having high heat resistance that can maintain its shape without being melted or decomposed by the heat transmitted through the second heat conductive sheet 21. In this embodiment, the cushion member 22 is more preferably made of a urethane-based elastomer impregnated with silicone or silicone rubber. _{The cushion member 22 may be configured by dispersing a filler typified by Al 2} O ₃ , AlN, cBN, hBN, diamond particles, or the like in rubber in order to increase its thermal conductivity as much as possible. The cushion member 22 may contain air bubbles or may not contain air bubbles. Further, the "cushion member" means a member that is highly flexible and can be elastically deformed so as to be in close contact with the surface of a heat source, and in this sense, it can be read as a "rubber-like elastic body". Further, as a modification of the cushion member 22, a metal may be used instead of the rubber-like elastic body. The cushion member 22 can also be made of a sponge or a solid (a non-porous structure such as a sponge) formed of resin, rubber, or the like.

(4-3) Connecting member The thread 25, which is an example of the connecting member, is a member that connects two or more heat radiating members 20 and restricts the free movement of the heat radiating member 20. The yarn 25 is preferably a yarn that can withstand a high temperature of about 120 ° C., and is preferably made of twisted yarn made of fibers such as natural fibers, synthetic fibers, carbon fibers, and metal fibers. It is preferable that the thread 25 has flexibility or a spatial region of a ring that allows the heat radiating member 20 to have a flat shape due to a load from a heat source or the like. As a method of sewing and connecting the heat radiating member 20 with the thread 25, it may be sewn by hand or by using a sewing machine. The sewing method of the thread 25 is not particularly limited, and any sewing method such as hand sewing, lock stitching, zigzag stitching, single chain stitching, double chain stitching, overlock stitching, flat stitching, safety stitching, and overlock stitching may be used. Further, according to the display symbols specified by JIS L 0120, suitable sewing methods are "101", "209", "301", "304", "401", "406", "407", and "410". , "501", "502", "503", "504", "505", "509", "512", "514", "602" and "605" It can be illustrated.

The gap between the heat radiating members 20 becomes narrow when the heat radiating member 20 is crushed by being pressed by the cell 50 or the like. If the heat radiating member 20 is hardly crushed, the adhesion between the second heat conductive sheet 21 and the cell 50 or the like may be lowered. The thickness of the heat radiating member 20 suitable for reducing such risk when compressed in the vertical direction, that is, in the direction from the cell 50 toward the cooling portion is at least the pipe diameter of the heat radiating member 20 (= circle-equivalent diameter: D). 80% of. Here, the "circle-equivalent diameter" means the diameter of a perfect circle having the same area as the cross-sectional area of the pipe when the heat radiating member 20 is cut perpendicular to the length direction thereof. When the heat radiating member 20 is a cylinder having a perfect circular cross section, its diameter is the same as the circle-equivalent diameter. When the heat radiating member 20 receives the above compression, it can be considered that the heat radiating member 20 is deformed so that the surface in contact with the cell 50 or the like is a flat surface and the direction of the gap L1 between the heat radiating members 20 is a substantially arc cross section. If the gap L1 is made sufficiently large, the heat radiating member 20 does not come into contact with the adjacent heat radiating member 20. On the contrary, if the gap L1 is too small, even if the heat radiating member 20 is compressed in the vertical direction, it may come into contact with the adjacent heat radiating member 20 and not be further crushed. If the gap L1 is set to 11.4% or more of the circle-equivalent diameter D of the heat-dissipating member 20, the heat-dissipating members 20 come into contact with each other when the heat-dissipating member 20 is compressed to a thickness of 80% of the circle-equivalent diameter D and deformed. Therefore, it is possible to prevent the deformation from becoming an obstacle. Therefore, in the heat radiating structure 30, it is preferable that a plurality of heat radiating members 20 are arranged so that the gap L1 between the heat radiating members 20 is 11.4% or more of the circle-equivalent diameter D of the heat radiating members 20 (FIG. 4). (See (4C)).

(4-4) Thermally Conductive Oil The thermally conductive oil preferably contains a silicone oil and a thermally conductive filler having a higher thermal conductivity than the silicone oil and consisting of one or more of metal, ceramics or carbon. The second heat conductive sheet 21 has a gap (hole or recess) microscopically. Normally, air is present in the gap, which may adversely affect the thermal conductivity. The heat conductive oil fills the gap and exists in place of air, and has a function of improving the heat conductivity of the second heat conductive sheet 21.

The heat conductive oil is provided on the surface of the second heat conductive sheet 21, at least the surface where the heat source or the like and the second heat conductive sheet 21 come into contact with each other. In the present application, the "oil" of the thermally conductive oil refers to a combustible substance that is liquid or semi-solid at room temperature (any temperature in the range of 20 to 25 ° C.) that is water-insoluble. Instead of the word "oil", "grease" or "wax" can also be used. The heat conductive oil is an oil having a property that does not interfere with heat conduction when heat is transferred from the heat source to the second heat conductive sheet 21. As the heat conductive oil, a hydrocarbon-based oil or a silicone oil can be used. The thermally conductive oil preferably contains a silicone oil and a thermally conductive filler having a higher thermal conductivity than the silicone oil and consisting of one or more of metal, ceramics or carbon.

Silicone oils preferably consist of molecules with a linear structure having a siloxane bond of 2000 or less. Silicone oil is roughly classified into straight silicone oil and modified silicone oil. Examples of the straight silicone oil include dimethyl silicone oil, methyl phenyl silicone oil, and methyl hydrogen silicone oil. Examples of the modified silicone oil include reactive silicone oil and non-reactive silicone oil. Reactive silicone oils include, for example, various silicone oils such as amino-modified type, epoxy-modified type, carboxy-modified type, carbinol-modified type, methacryl-modified type, mercapto-modified type, and phenol-modified type. The non-reactive silicone oil includes various silicone oils such as a polyether-modified type, a methylstyryl-modified type, an alkyl-modified type, a higher fatty acid ester-modified type, a hydrophilic special-modified type, a higher fatty acid-containing type, and a fluorine-modified type. Since silicone oil is an oil having excellent heat resistance, cold resistance, viscosity stability, and heat conductivity, it is applied to the surface of the second heat conductive sheet 21 to be applied between a heat source or the like and the second heat conductive sheet 21. It is particularly suitable as a heat conductive oil to intervene in. The thermally conductive oil preferably contains, in addition to the oil, a thermally conductive filler composed of one or more of metal, ceramics or carbon. Examples of the metal include gold, silver, copper, aluminum, beryllium, and tungsten. Examples of ceramics include alumina, aluminum nitride, cubic boron nitride, and hexagonal boron nitride. Examples of carbon include diamond, graphite, diamond-like carbon, amorphous carbon, and carbon nanotubes.

The heat conductive oil is preferably interposed between the heat source and the second heat conductive sheet 21 and preferably between the second heat conductive sheet 21 and the cooling portion. The heat conductive oil may be applied to the entire surface of the second heat conductive sheet 21 or may be applied to a part of the second heat conductive sheet 21. The method of allowing the heat conductive oil to exist in the second heat conductive sheet 21 is not particularly limited, and is sprayed with a spray, applied with a brush or the like, and the second heat conductive sheet 21 into the heat conductive oil. Any method such as dipping in the oil may be used. The heat conductive oil is not an essential configuration for the heat radiating structure 30, but an additional configuration that can be suitably provided.

2. Method for Manufacturing Cell Unit Next, an example of a suitable manufacturing method for cell unit 1 according to the present embodiment will be described. First, an example of a suitable manufacturing method of the heat radiating member 20 constituting the heat radiating structure 30 will be described.

FIG. 5 shows a diagram for explaining a manufacturing process of a heat radiating member constituting the heat radiating structure.

First, the cushion member 22 having the hollow portion 23 is molded. Next, an adhesive is applied to the outer surface of the cushion member 22. Next, after the band-shaped second heat conductive sheet 21 is spirally wound on the outer surface of the cushion member 22, if there is a portion where the second heat conductive sheet 21 protrudes from both ends of the cushion member 22, the portion protrudes. Cut or cut the cushion member 22 together. Finally, the heat conductive oil is applied to the surface of the second heat conductive sheet 21. It is also possible to fix the cushion member 22 and the second heat conductive sheet 21 without interposing an adhesive. In that case, a cushion member 22 in a state before being completely cured is prepared, and a band-shaped second heat conductive sheet 21 is wound around the outer surface thereof. After that, the cushion member 22 is heated to be completely cured, and the second heat conductive sheet 21 is fixed to the outer surface of the cushion member 22.

The cutting step of cutting the portion protruding from both ends of the cushion member 22 of the second heat conductive sheet 21 and the coating step of applying the heat conductive oil are not limited to those performed at the above-mentioned timing. For example, the cutting step may be performed after the coating step.

The heat radiating structure 30 is manufactured by connecting a plurality of heat radiating members 20 manufactured by the above-mentioned manufacturing method with a thread 25 in a state of arranging them in a direction orthogonal to the length direction of the heat radiating member 20.

The cell unit 1 is manufactured by laminating the two heat radiating structures 30 manufactured as described above on the upper and lower surfaces of the cell stack 60. In the cell unit 1, preferably, the heat radiating structure 30 is laminated on the cell stack 60 so that the direction in which the plurality of heat radiating members 20 constituting the heat radiating structure 30 are arranged and the direction in which the plurality of cells 50 are arranged are orthogonal to each other. (See FIG. 1). By configuring the cell unit 1 in this way, the cell 50 and the multilayer sheet 10 can be more reliably brought into contact with the heat radiating member 20, so that the heat radiating from the cell 50 via the heat radiating member 20 can be sent to the cooling portion. It can be transmitted reliably.

In the cell unit 1 manufactured in this way, since the multilayer sheet 10 is arranged between the cells 50, even if one cell 50 abnormally generates heat or ignites, the heat insulating sheet constituting the multilayer sheet 10 is formed. With 12, the heat conduction to the adjacent cell 50 can be reduced. Further, even when the cell 50 expands during charging / discharging (heating) of the cell 50, the multilayer sheet 10 can follow the shape of the cell 50 by the rubber sheet 13. Further, since the cell unit 1 is provided with the heat radiating structure 30 at both ends of the cell 50 and the multilayer sheet 10, the heat from the cell 50 and the heat transferred from the cell 50 to the multilayer sheet 10 are surely transferred to the heat radiating structure 30. Can be made to. In the heat radiating structure 30, since a plurality of heat radiating members 20 are connected in a rod shape by threads 25, the heat radiating member follows the surface of the cell 50 in a state of being compressed by the cell 50 (see FIG. 4 (4C)). When the 20 is crushed in the vertical and horizontal directions and the cell 50 is removed, the original shape can be restored by the elastic force of the heat radiating member 20. Further, since each heat radiating member 20 has a structure in which the second heat conductive sheet 21 is spirally wound around the outer surface of the cushion member 22, the heat radiating structure 30 is excessively deformed with respect to the deformation of the cushion member 22. Do not restrain. Therefore, it is possible to reduce the heat conduction between the plurality of cells 50 and increase the heat transfer efficiency from the cell 50 to the cooling portion.

An example of a suitable manufacturing method of the modified example of the cell unit 1 according to the present embodiment will be described. In this modification, the heat radiating member 20 constituting the heat radiating structure 30 of the cell unit 1 described above is replaced with the heat radiating member 20a, but the heat radiating member 20 is manufactured by the same manufacturing method as the cell unit 1 described above. A detailed description will be omitted. Hereinafter, a suitable manufacturing method of the heat radiating member 20a will be described.

FIG. 6 shows a diagram for explaining a suitable manufacturing process of a modified example of the heat radiating structure.

First, the strip-shaped laminated sheet 28 is manufactured. In the production of the strip-shaped laminated sheet 28, the second heat conductive sheet 21 and the cushion member 22 are preferably fixed with an adhesive. Next, the strip-shaped laminated sheet 28 is wound in a spiral shape and advanced in one direction to manufacture a long heat-dissipating member 20a. As a manufacturing method in which an adhesive is not interposed between the second heat conductive sheet 21 and the cushion member 22, the following method can be exemplified. For example, the second heat conductive sheet 21 is attached on the cushion member 22 in an uncured state in which the cushion member 22 is not completely cured. Then, the cushion member 22 is completely cured by heating.

After winding the strip-shaped laminated sheet 28 in a spiral shape, both ends of the laminated sheet 28 may be cut to adjust the shape. Finally, the heat conductive oil is applied to the surface of the second heat conductive sheet 21. The heat radiating member 20a includes a hollow portion 23 penetrating in the length direction thereof. Unlike the heat radiating member 20 in the above-described embodiment, the hollow portion 23 also penetrates in the direction of the outer surface of the heat radiating member 20a. As described above, the cushion member 22 is arranged inside the second heat conductive sheet 21, and the second heat conductive sheet 21 and the cushion member 22 have a form in which the second heat conductive sheet 21 and the cushion member 22 integrally travel in one direction in a spiral shape. Since the heat radiating member 20a has a spiral shape as a whole, it is easier to expand and contract in the length direction of the heat radiating member 20a than the heat radiating member 20 described above.

3. 3. Battery Next, the battery according to this embodiment will be described.

FIG. 7 shows a perspective view of the battery according to the present embodiment.

In this embodiment, the battery 40 includes the cell unit 1 in a housing 41 having a structure for flowing the coolant 45. The battery 40 is, for example, a battery for an electric vehicle and includes a large number of cells 50. The battery 40 preferably includes a bottomed housing 41 that opens to at least one side. The housing 41 preferably has an opening 47 on at least one side surface. The housing 41 is preferably made of aluminum or an aluminum-based alloy. The cell 50 is arranged inside 44 of the housing 41. One or more water cooling pipes 43 are provided at the top and bottom of the housing 41, which is an example of the cooling portion 42, for flowing the cooling water, which is an example of the coolant 45. In this embodiment, there are two or more water-cooled pipes 43. However, one water-cooled pipe 43 may be provided on one or two sides of the housing 41 in a snake shape. The coolant 45 may be referred to as a cooling medium or a coolant. Although the details of the battery 40 will be described later, the cell unit 1 is arranged inside the housing 41 by inserting the cell unit 1 through the opening 47. Therefore, the cell 50 is arranged in the housing 41 so as to sandwich the heat radiating structure 30 with the cooling portion 42. Further, the cell 50 is arranged in the housing 41 so as to sandwich the multilayer sheet 10 between the cell 50 and the adjacent cell 50.

In the battery 40 having such a structure, the cell 50 transfers heat to the inside of the housing 41 (more specifically, the cooling portion 42) through the multilayer sheet 10 and / or the heat radiating structure 30, and is effectively removed by water cooling. Be heated. Further, since the multi-layer sheet 10 is arranged between the cells 50 of the battery 40, even if one cell 50 abnormally generates heat or ignites, the battery 40 is adjacent to the battery 40 by the heat insulating sheet 12 constituting the multi-layer sheet 10. The heat conduction to the cell 50 can be reduced. Further, even when the cell 50 expands during charging / discharging (heating) of the cell 50, the multilayer sheet 10 can follow the shape of the cell 50 by the rubber sheet 13. Therefore, it is possible to reduce the heat conduction between the plurality of cells 50 and increase the heat transfer efficiency from the cells 50. Further, in the heat radiating structure 30, since a plurality of heat radiating members 20 are connected in a bamboo blind shape by threads 25, for example, a situation in which the heat radiating members 20 are unevenly distributed due to vibration of an automobile or the like can be suppressed, and workability is improved. The coolant 45 is not limited to the cooling water, but is interpreted to include an organic solvent such as liquid nitrogen and ethanol. The coolant 45 is not limited to a liquid under the conditions used for cooling, and may be a gas or a solid.

4. Battery Manufacturing Method Next, a battery manufacturing method according to the present embodiment will be described.

FIG. 8 shows a flowchart including the main steps of the battery manufacturing method according to the present embodiment. 9A and 9B show the main steps of the battery manufacturing method according to the present embodiment, respectively. 10A and 10B show the main steps of the battery manufacturing method according to the present embodiment, respectively.

The battery manufacturing method according to this embodiment is a method of manufacturing the above-mentioned battery 40 (see FIG. 7) by arranging the cell unit 30 in the housing 41. The method for manufacturing the battery 40 according to this embodiment includes a stacking step (S110), an insertion step (S120), and a drawing step (S130). Hereinafter, each step will be described.

(1) Laminating step (S110)
The laminating step is a step of generating a cell unit 5 with a film in which the auxiliary film 32 is laminated on the heat radiating structure 30 of the cell unit 1 (see FIG. 9 (9A)). More specifically, the laminating step is a step of laminating the auxiliary film 32 on the two heat radiating structures 30 constituting the cell unit 1, that is, on the upper and lower surfaces of the cell unit 1.

The auxiliary film 32 is preferably a film made of resin. The resin is preferably polyethylene terephthalate (PET), polyethylene naphthalate, polyethylene isophthalate, polybutylene terephthalate, polyolefin, polyacetate, polycarbonate, polyphenylene sulfide, polyamide, ethylene-vinyl acetate copolymer, polyvinyl chloride, polyvinyl chloride. It is composed of vinylidene, synthetic rubber, liquid crystal polymer, etc. The auxiliary film 32 may be composed of one of these resins alone, or may be configured as a multilayer film in which two or more kinds of resins are combined. The auxiliary film 32 is a film that covers the heat radiating structure 30. Further, the auxiliary film 32 preferably includes a protruding portion 32a protruding outward from the upper surface or the lower surface of the cell unit 1 at one end of the heat radiating member 20 in the connecting direction (direction in which the plurality of cells 50 are lined up). The "protruding portion" may be paraphrased as a "surplus area". It is preferable that the protruding portion 32a has a size that can be grasped when an operator or the like pulls out the auxiliary film 32 from the housing 41 in the pulling step (S130) described later. The thickness of the auxiliary film 32 is not limited, but is preferably 0.001 to 0.1 mm, more preferably 0.01 to 0.05 mm. Further, the auxiliary film 32 is preferably a transparent or translucent film.

(2) Insertion step (S120)
The insertion step is a step of inserting the cell unit 5 with a film into the housing 41 so that the cooling portion 42 through which the coolant 45 flows in the housing 41 and the heat radiating structure 30 are in close contact with each other via the auxiliary film 32. (See FIG. 9 (9B)). More specifically, the insertion step is a step of inserting the cell unit 5 with a film through the opening 47 of the housing 41. By inserting the cell unit 5 with a film into the inside 44 of the housing 41 in this way, the cooling portions 42 provided at the top and bottom of the housing 41 and the heat radiating structure 30 are connected to each other via the auxiliary film 32. Can be brought into close contact. In the insertion step, it is preferable that the cell unit 5 with a film is inserted so that the protruding portion 32a of the auxiliary film 32 protrudes to the outside of the housing 41. That is, in the insertion step, it is preferable that the cell unit 5 with a film is inserted into the housing 41 from the side facing the protruding portion 32a.

(3) Pulling out step (S130)
The pull-out step is a step of pulling out the auxiliary film 32 from the housing 41 and bringing the heat radiating structure 30 into contact with the cooling portion 42 (see FIG. 10A). More specifically, the pull-out step is a step in which the auxiliary film 32 is pulled out to the outside of the housing 41 (in the direction of the arrow shown in FIG. 10A) while the protruding portion 32a is gripped by an operator or the like. By pulling out the auxiliary film 32 from the housing 41 in this way, the heat radiating structure 30 can be brought into contact with the cooling portion 42. In this way, the battery 40 as shown in FIG. 10 (10B) can be manufactured.

According to the above-mentioned manufacturing method, the battery 40 in which the cell unit 1 is arranged in the housing 41 is provided so as to bring the heat radiating structure 30 of the cell unit 1 into contact with the cell 50 and the cooling portion 42 without requiring a complicated manufacturing process. Can be manufactured. Further, according to the above-mentioned manufacturing method, even if the cell stack 60 and the heat radiating structure 30 are not fixed by a fixing means such as an adhesive or double-sided tape, the heat radiating structure can be obtained by using the auxiliary film 32. The cell unit 1 can be arranged in the housing 41 so that the heat radiating structure 30 comes into contact with the cell 50 and the cooling portion 42 while suppressing the misalignment of the body 30.

5. Other Embodiments As described above, the preferred embodiments of the present invention have been described, but the present invention is not limited to these, and can be implemented in various modifications.

The cell unit 1 may include a heat radiating structure including both the heat radiating members 20 and 20a. The shape of the heat radiating members 20 and 20a may be other than a cylinder or a cylinder, such as an elliptical cylinder, an elliptical pillar, a square cylinder having a triangle or more, or a square pillar. The heat radiating member is not limited to the above-mentioned heat radiating members 20 and 20a. The heat radiating member is provided inside the heat conductive sheet and the heat conductive sheet for transferring heat from the heat source such as the first heat conductive sheet 11 and the second heat conductive sheet 21, and is provided in the heat source as compared with the heat conductive sheet. If a cushion member that is easily deformed according to the surface shape is provided, various types of heat radiating members such as the following may be used. For example, a form in which the outer surface of the tubular cushion member is covered with a heat conductive sheet, a form in which the outer surface of the tubular cushion member is covered with a heat conductive sheet at least once, and the overlapping region of the heat conductive sheet is in a non-adhesive state. , The outer surface of the long cushion member with vertical slits is covered with a heat conductive sheet, and the outer surface of the long cushion member with vertical slits is also covered with a heat conductive sheet with vertical slits. Various heat radiating members in the above-mentioned form can be used.

Further, although the heat radiating members 20 and 20a are provided with the cushion member 22, the cushion member 22 may not be provided.

Further, the spiral cushion member 22 in the heat radiating member 20a is not limited to the same width as the second heat conductive sheet 21, and may be larger or smaller than the width of the second heat conductive sheet 21.

Further, in the cell unit 1, the heat radiating structure 30 is laminated on the cell stack 60 so that the direction in which the plurality of heat radiating members 20 and 20a are arranged and the direction in which the plurality of cells 50 are arranged are orthogonal to each other, but the present invention is limited to this. Not done. For example, in the cell unit 1, the heat radiating structure 30 may be laminated on the cell stack 60 so that the direction in which the plurality of heat radiating members 20 and 20a are lined up and the direction in which the plurality of cells 50 are lined up are substantially parallel.

Further, the cell unit 1 may include a hollow heat conductive member that is in contact with at least the end face of the multilayer sheet 10 and is long in the length direction of the end face (the direction orthogonal to the direction in which the cells 50 are arranged). The outer surface of the heat conductive member is a member whose outer surface is covered with a heat conductive sheet for transferring heat from a heat source such as the first heat conductive sheet 11 or the second heat conductive sheet 21, and preferably the outer surface thereof. Is a member covered with a sheet having the same configuration as the multilayer sheet 10. Further, in this case, it is more preferable that the cell unit 1 is formed of a sheet in which the multilayer sheet 10 and the heat conductive member are continuous.

Further, the plurality of components of each of the above-described embodiments can be freely combined except when they cannot be combined with each other. For example, the heat radiating structure 30 constituting the cell unit 1 may include a heat radiating member 20a.

The cell unit and battery according to the present invention can be used, for example, as a battery for automobiles, a rechargeable battery for home use, and a battery for electronic devices such as PCs.

1 ... cell unit, 5 ... cell unit with film, 10 ... multi-layer sheet, 11 ... first heat conductive sheet, 12 ... heat insulating sheet, 13 ... rubber sheet, 20, 20a ... Heat dissipation member, 21 ... Second heat conductive sheet, 22 ... Cushion member (cylindrical cushion member is an example), 23 ... Hollow part, 25 ... Thread (example of connecting member) , 30 ... heat dissipation structure, 32 ... auxiliary film, 40 ... battery, 41 ... housing, 42 ... cooling part, 45 ... coolant, 50 ... cell (heat source) An example).

Claims (13)

With cells as multiple heat sources,
A multilayer sheet arranged at least between the plurality of cells and
A heat radiating structure arranged at at least one end of the cell and provided with a plurality of heat radiating members for enhancing heat radiating from the cell.
It is a cell unit equipped with
The multilayer sheet is
A rubber sheet made of a rubber-like elastic body and
A heat insulating sheet that is continuously or separatedly laminated on both sides of the rubber sheet and can reduce heat conduction between a plurality of adjacent cells.
A first heat conductive sheet that is separated and laminated on the outside of the heat insulating sheet and has a higher thermal conductivity than the rubber sheet and the heat insulating sheet and contains at least one of metal, carbon, or ceramics.
With
The heat radiating member is a long-shaped member that comes into contact with at least one end of the cell, and includes a second heat conductive sheet that covers the outer surface thereof. The cell unit according to claim 1, wherein the heat radiating member is a tubular member having a hollow portion along the length direction thereof. The heat-dissipating member according to claim 1 or 2, wherein the heat-dissipating member is a member provided inside the second heat-conducting sheet and is provided with a cushion member that is more easily deformed than the second heat-conducting sheet. Cell unit. The heat radiating member includes a hollow portion along the length direction thereof.
The cushion member is a tubular cushion member including the hollow portion that is long in the length direction of the heat radiating member.
The cell unit according to claim 3, wherein the second heat conductive sheet is spirally wound in the length direction of the cushion member. The cell unit according to claim 3, wherein the second heat conductive sheet and the cushion member integrally have a shape of traveling in one direction in a spiral shape. The method according to any one of claims 1 to 5, wherein the heat radiating structure is connected by a connecting member in a state in which a plurality of the heat radiating members are arranged in a direction orthogonal to the length direction thereof. Cell unit. The cell according to claim 6, wherein the heat radiating structure is connected by the connecting member in a state where the plurality of the heat radiating members are arranged in a direction orthogonal to the direction in which the plurality of cells are arranged. unit. The cell unit according to any one of claims 1 to 7, wherein the heat insulating sheet is a sheet containing silica airgel. The cell unit according to any one of claims 1 to 8, wherein the rubber sheet is a sheet containing silicone rubber. Any one of claims 1 to 9, wherein the surface of the second heat conductive sheet has a heat conductive oil for increasing the heat conductivity from the cell in contact with the surface to the surface. The cell unit described in. The cell according to claim 10, wherein the thermally conductive oil contains a silicone oil and a thermally conductive filler having a higher thermal conductivity than the silicone oil and consisting of one or more of metal, ceramics or carbon. unit. A battery according to any one of claims 1 to 11, wherein the cell unit according to any one of claims 1 to 11 is provided in a housing having a structure for flowing a coolant. The method for manufacturing a battery according to claim 12.
A laminating step of generating a cell unit with a film in which an auxiliary film is laminated on the heat radiating structure of the cell unit, and
An insertion step of inserting the cell unit with a film into the housing so that the cooling portion through which the coolant flows in the housing and the heat radiating structure are in close contact with each other via the auxiliary film.
A pull-out step of pulling out the auxiliary film from the housing and bringing the heat-dissipating structure into contact with the cooling portion.
A method of manufacturing a battery, which comprises having.

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