Direct cooling plate assembly and power battery

Abstract

The utility model relates to the technical field of batteries, in particular to a direct cooling plate assembly and a power battery. The direct cooling plate assembly comprises a direct cooling plate and a graphite composite soaking film, a refrigerant flow channel is distributed in the direct cooling plate for refrigerant circulation, the graphite composite soaking film is laid on the surface of one side of the direct cooling plate, and the direct cooling plate is attached to the battery module through the graphite composite soaking film. When the temperature of the battery module rises, the heat of the battery module can be transferred to the direct cooling plate through the graphite composite soaking film, so that the refrigerant is subjected to phase change to absorb a large amount of heat, and the quick cooling of the battery module is realized. Meanwhile, the graphite composite soaking film has a high heat conductivity coefficient in the plane direction and has a good temperature uniformizing effect, so that the consistency of the surface temperature of the direct cooling plate is effectively improved, the temperature difference between battery cells of the battery module is reduced, the temperature consistency of the battery module is improved while efficient heat dissipation of the battery module is achieved, and the service life of the battery module is prolonged. The use safety and the cycle life of the battery module are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a direct cooling plate assembly and a power battery. BACKGROUND

[0002] At present, battery cooling mainly includes air cooling, liquid cooling and direct cooling.

[0003] Air cooling is the earliest applied battery cooling method, mainly using air to flow through the surface of the battery cell to take away the heat of the battery module, and the structure is relatively simple and the cost is also relatively low, but there are many deficiencies in heat distribution, energy efficiency and noise.

[0004] Liquid cooling is through the contact between the liquid cooling plate and the battery module, and the liquid cooling plate circulates cooling liquid (such as glycol solution), so as to use the cooling liquid as a heat exchange medium to take away the heat of the battery module; the cooling liquid has higher thermal conductivity, density and specific heat capacity than air, so it has better heat exchange effect than air cooling, but the cooling liquid has poor electrical insulation and has the risk of leakage.

[0005] Direct cooling is through the contact between the direct cooling plate and the battery module, and the direct cooling plate circulates refrigerant, and uses the principle of phase change refrigeration of the refrigerant to take away the heat of the battery module; compared with the liquid cooling method, the direct cooling has higher cooling efficiency, which is 3-4 times higher than the liquid cooling, and can better meet the demand of high-power charging and discharging of the battery, and the refrigerant is mainly R600a (isobutane), R134a (tetrafluoroethane), R410a (a mixture of difluoromethane and pentafluoroethane) and other new environmentally friendly refrigerants, which can also avoid the risk of short circuit caused by leakage of the heat exchange medium in the power battery.

[0006] However, the current direct cooling plate has a large temperature difference on the surface when the refrigerant flows in the flow channel of the direct cooling plate due to uneven distribution and phase change along the flow channel, which affects the temperature consistency of the battery module and is not conducive to the use safety and cycle life of the battery. CONTENT OF THE UTILITY MODEL

[0007] The utility model aims to provide a direct cooling plate assembly and a power battery, which can realize rapid cooling of the battery module and reduce the temperature difference between the battery cells.

[0008] The utility model provides a direct cooling plate assembly, which comprises a direct cooling plate and a graphite composite heat distribution film.

[0009] The direct cooling plate is provided with a refrigerant flow channel for circulating refrigerant.

[0010] The straight cooling plate is arranged on one side of a battery module, the graphite composite uniform heating film is arranged on the side of the straight cooling plate facing the battery module, and the straight cooling plate is attached to the battery module through the graphite composite uniform heating film.

[0011] Further, the graphite composite uniform heating film comprises a glue layer, a graphite layer and an organic polymer layer which are stacked in sequence, and the graphite composite uniform heating film is attached to the straight cooling plate through the glue layer.

[0012] Further, the organic polymer layer is one of a polycarbonate layer, a polypropylene layer, a polyethylene layer, a polyacrylonitrile layer, a polyamide layer and a polyester layer.

[0013] Further, the thickness of the graphite composite uniform heating film is 20-300 microns.

[0014] Further, the graphite composite uniform heating film is a complete piece, or the graphite composite uniform heating film is multiple pieces, and the multiple pieces of the graphite composite uniform heating film are arranged side by side and spaced apart.

[0015] Further, the straight cooling plate has a first direction and a second direction which are perpendicular to each other, the straight cooling plate has a size a along the first direction and a size b along the second direction;

[0016] The graphite composite uniform heating film forms a coverage area on the straight cooling plate, the coverage area has a size c along the first direction and a size d along the second direction, and 50%*a≤c≤a and 50%*b≤d≤b.

[0017] Further, the straight cooling plate comprises a substrate and a heat exchange pipe;

[0018] The side of the substrate facing the battery module is provided with a mounting groove, and the heat exchange pipe is adaptively embedded in the mounting groove, and the inside of the heat exchange pipe forms the refrigerant flow channel;

[0019] The heat exchange pipe forms a first flat portion on the side facing the slot of the mounting groove, and the first flat portion is flush with the side surface of the substrate facing the battery module.

[0020] Further, the heat exchange pipe forms a second flat portion, and the first flat portion and the second flat portion are located on opposite sides of the heat exchange pipe.

[0021] Further, the substrate is an aluminum substrate;

[0022] The heat exchange pipe is a copper pipe or an aluminum pipe.

[0023] The utility model further provides a power battery which comprises the straight cooling plate assembly of any one of the above.

[0024] Compared with the prior art, the direct-cooling plate assembly has the beneficial effects that:

[0025] The direct-cooling plate assembly provided by the utility model includes a direct-cooling plate and a graphite composite uniform heating film, the direct-cooling plate is internally arranged with a refrigerant flow channel, refrigerant as a refrigerant can circulate in the direct-cooling plate, and the side surface of the direct-cooling plate is paved with the graphite composite uniform heating film; the direct-cooling plate is arranged on one side of the battery module, and the side surface of the direct-cooling plate provided with the graphite composite uniform heating film faces the battery module, so that the direct-cooling plate is attached to the battery module through the graphite composite uniform heating film. When the temperature of the battery module rises in the working process, the heat of the battery module can be transmitted to the direct-cooling plate through the graphite composite uniform heating film, so that the refrigerant circulating in the direct-cooling plate is phase changed due to heat, a large amount of heat is absorbed in the phase change process of the refrigerant, and the purpose of refrigeration is achieved, and rapid cooling of the battery module is realized.

[0026] Meanwhile, the graphite composite uniform heating film arranged between the battery module and the direct-cooling plate has a high thermal conductivity in the plane direction, so that the graphite composite uniform heating film has a good temperature equalization effect, thereby effectively improving the consistency of the surface temperature of the direct-cooling plate, avoiding the problem that the surface temperature difference of the direct-cooling plate is large due to the refrigerant flow channel distribution and the non-uniform phase change of the refrigerant along the path, and further reducing the temperature difference between each cell of the battery module, so that the temperature consistency of the battery module is improved while the high-efficiency heat dissipation of the battery module is realized, and the use safety and the cycle life of the battery module are improved.

[0027] The utility model also provides a kind of power battery, including the direct-cooling plate assembly of described, so the power battery also has the beneficial effects of direct-cooling plate assembly. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can also be obtained by those skilled in the art without creative labor.

[0029] Figure 1 The structure schematic view of the direct-cooling plate assembly provided by the utility model embodiment under the first visual angle is shown in the figure.

[0030] Figure 2 The structure schematic view of the heat exchange pipe of the direct-cooling plate assembly provided by the utility model embodiment is shown in the figure.

[0031] Figure 3 The structure schematic view of the heat exchange pipe of the direct-cooling plate assembly provided by the utility model embodiment is shown in the figure.

[0032] Figure 4The structure schematic diagram of the straight cooling plate assembly provided by the embodiment of the present application under the second visual angle is shown.

[0033] Reference signs:

[0034] 1 - straight cooling plate, 11 - base plate, 12 - heat exchange pipe, 13 - first flat part, 14 - second flat part, 2 - graphite composite heat uniform film, 3 - battery module. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0036] The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.

[0037] Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of the present application.

[0038] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] The following will be described with reference to Figures 1 to 4 The straight cooling plate assembly and power battery according to some embodiments of the present application are described.

[0041] This application provides a direct cooling plate assembly for heat dissipation of a battery module.

[0042] like Figure 1 As shown, the direct cooling plate assembly includes a direct cooling plate 1 and a graphite composite heat-spreading film 2. The direct cooling plate 1 is provided with refrigerant channels so that the refrigerant can flow inside the direct cooling plate 1, and the graphite composite heat-spreading film 2 is laid on one side surface of the direct cooling plate 1. The direct cooling plate 1 is used to be disposed on one side of the battery module 3, and the side surface of the direct cooling plate 1 with the graphite composite heat-spreading film 2 faces the battery module 3, so that the direct cooling plate 1 is in contact with the battery module 3 through the graphite composite heat-spreading film 2.

[0043] When the temperature of the battery module 3 rises during operation, the heat of the battery module 3 can be transferred to the direct cooling plate 1 through the graphite composite heat dissipation film 2. This causes the refrigerant flowing in the direct cooling plate 1 to undergo a phase change due to the heat. The phase change process of the refrigerant will absorb a large amount of heat, thereby achieving the purpose of cooling and realizing the rapid cooling of the battery module 3.

[0044] Meanwhile, the graphite composite heat dissipation film 2 located between the battery module 3 and the direct cooling plate 1 has a high thermal conductivity in its planar direction, which enables the graphite composite heat dissipation film 2 to have a good temperature uniformity effect, thereby effectively improving the uniformity of the surface temperature of the direct cooling plate 1. This avoids the problem of large surface temperature differences of the direct cooling plate 1 caused by the distribution of the refrigerant flow channel and the uneven phase change of the refrigerant along the process, thereby reducing the temperature difference between the cells of the battery module 3. This achieves efficient heat dissipation of the battery module 3 while improving the temperature uniformity of the battery module 3, and improving the safety and cycle life of the battery module 3.

[0045] In one embodiment of this application, preferably, the graphite composite heat-dissipating film 2 includes an adhesive layer, a graphite layer, and an organic polymer layer, which are stacked sequentially. Specifically, the adhesive layer is located on one side of the graphite layer, and the organic polymer layer is located on the other side. The adhesive layer is composed of a thermally conductive adhesive or similar bonding agent, serving an adhesive function. During use, the graphite composite heat-dissipating film 2 is adhered to one side of the direct cooling plate 1 by the adhesive layer. The graphite layer is made of graphite, which has a high thermal conductivity, serving a heat conduction function, allowing the heat from the battery module 3 to be quickly transferred to the direct cooling plate 1, and providing good temperature uniformity in its planar direction. The organic polymer layer is made of organic polymer materials, such as polycarbonate, polypropylene, polyethylene, polyacrylonitrile, polyamide, or polyester, serving an insulating and protective function.

[0046] In one embodiment of this application, preferably, the thickness of the graphite composite heat dissipation film 2 is 20μm to 300μm. The micron-level thickness can not only improve the temperature consistency of the surface of the direct cooling plate 1 and the cells of the battery module 3, but also does not occupy too much space and has almost no impact on the overall size of the system.

[0047] Preferably, the thermal conductivity of the graphite composite heat-dissipating film 2 in the planar direction is 600W / (m·K) to 2000W / (m·K), which enables rapid heat transfer between the battery module 3 and the direct cooling plate 1, and provides good temperature uniformity.

[0048] In one embodiment of this application, preferably, the graphite composite heat-spreading film 2 is a complete piece with a large size, so as to ensure the coverage of the graphite composite heat-spreading film 2 on the direct cooling plate 1 and effectively improve the temperature uniformity of the direct cooling plate 1.

[0049] Or, such as Figure 1 As shown, the graphite composite heat dissipation film 2 consists of multiple small-sized pieces, which are arranged side by side with intervals. This not only ensures the temperature consistency of the direct cooling plate 1, but also effectively reduces costs.

[0050] Preferably, such as Figure 4 As shown, the direct cooling plate 1 has a first direction and a second direction perpendicular to each other. The direct cooling plate 1 has a dimension a along the first direction and a dimension b along the second direction. The graphite composite heat dissipation film 2 forms a covering area on the direct cooling plate 1. The covering area has a dimension c along the first direction and a dimension d along the second direction, where c and d satisfy: 50%*a≤c≤a, 50%*b≤d≤b, thereby ensuring that the area of ​​the covering area is not less than 50% of the area of ​​the direct cooling plate 1, so as to ensure the temperature uniformity of the direct cooling plate 1.

[0051] In one embodiment of this application, preferably, the direct cooling plate 1 includes a substrate 11 and a heat exchange tube 12, the substrate 11 being positioned facing the side of the battery module 3. Figure 1 An installation groove is provided on the upper side of the heat exchange tube 12, which is adapted to be embedded in the installation groove. The heat exchange tube 12 is fixed in the installation groove by bonding or welding. The interior of the heat exchange tube 12 forms the refrigerant flow channel for refrigerant circulation.

[0052] In this embodiment, such as Figure 2 As shown, the heat exchange tube 12 has a first flat portion 13 on the side facing the groove of the mounting groove, and the first flat portion 13 is flat with the upper surface of the substrate 11. This ensures the flatness of the upper surface of the direct cooling plate 1 and can also increase the contact area between the heat exchange tube 12 and the battery module 3 to a certain extent, thereby improving the heat exchange efficiency.

[0053] In this embodiment, preferably, as follows: Figure 3 As shown, the heat exchange tube 12 has a second flat portion 14 on the side facing the bottom of the mounting groove, which reduces the installation depth of the heat exchange tube 12 along the thickness direction of the straight cooling plate 1, which is also the heat transfer direction, to a certain extent, thereby improving the heat exchange efficiency.

[0054] In this embodiment, preferably, the substrate 11 is an aluminum substrate 11 easy to conduct heat, and the heat exchange pipe 12 is an aluminum pipe and a copper pipe, which are not only easy to conduct heat, but also not easy to leak.

[0055] The application also provides a power battery comprising the direct cooling plate assembly of any of the above embodiments.

[0056] In this embodiment, the power battery comprises the direct cooling plate assembly, so the power battery has all the beneficial effects of the direct cooling plate assembly, which will not be repeated here.

[0057] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cold plate assembly, comprising: The straight cooling plate and the graphite composite uniform heating film are included. The straight cooling plate is internally provided with a refrigerant flow channel for refrigerant circulation. The straight cooling plate is arranged on one side of a battery module, and the graphite composite uniform heating film is arranged on the side of the straight cooling plate facing the battery module, and the straight cooling plate is in contact with the battery module through the graphite composite uniform heating film. The straight cooling plate includes a base plate and a heat exchange pipe. The side of the base plate facing the battery module is provided with a mounting groove, and the heat exchange pipe is adaptively embedded in the mounting groove, and the inside of the heat exchange pipe forms the refrigerant flow channel. The side of the heat exchange pipe facing the slot of the mounting groove is provided with a first flat portion, and the first flat portion is flush with the side surface of the base plate facing the battery module. The heat exchange pipe is provided with a second flat portion, and the first flat portion and the second flat portion are located on opposite sides of the heat exchange pipe.

2. The cold plate assembly of claim 1, wherein, The graphite composite uniform heating film includes a glue layer, a graphite layer and an organic polymer layer which are stacked in sequence, and the graphite composite uniform heating film is bonded to the straight cooling plate through the glue layer.

3. The cold plate assembly of claim 2, wherein, The organic polymer layer is one of a polycarbonate layer, a polypropylene layer, a polyethylene layer, a polyacrylonitrile layer, a polyamide layer and a polyester layer.

4. The cold plate assembly of claim 1, wherein, The thickness of the graphite composite uniform heating film is 20-300 μm.

5. The cold plate assembly of claim 1, wherein, The graphite composite uniform heating film is a complete piece. Alternatively, the graphite composite uniform heating film is multiple pieces, and the multiple pieces of the graphite composite uniform heating film are arranged side by side and spaced apart.

6. The cold plate assembly of claim 1, wherein, The straight cooling plate has a first direction and a second direction perpendicular to each other, and has a size a along the first direction and a size b along the second direction. The graphite composite uniform heating film forms a coverage area on the straight cooling plate, and the coverage area has a size c along the first direction and a size d along the second direction, and 50%*a≤c≤a and 50%*b≤d≤b.

7. The cold plate assembly of claim 1, wherein, The base plate is an aluminum base plate. The heat exchange pipe is a copper pipe or an aluminum pipe.

8. A power cell, characterized by The straight cooling plate assembly of any one of claims 1-7 is included.

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