Fireproof high-thermal-conductivity phase-change thermal insulation pad and thermal insulation structure for battery module

Abstract

The utility model discloses a fireproof high thermal conductivity phase change heat insulation pad, a heat insulation structure for a battery module, a phase change structure (1) and a heat insulation piece (2), the phase change structure (1) comprises a first heat exchange part (11) and at least one second heat exchange part (12), the second heat exchange part (12) is vertically arranged on the first heat exchange part (11), and the second heat exchange part (12) and the first heat exchange part (11) form a heat insulation accommodating position; the heat insulation piece (2) is arranged at the heat insulation accommodating position; the end face, away from the heat insulation piece, of the first heat exchange part (11) serves as the end face making contact with the water cooling plate. The foam metal is made into the L-shaped structure or the U-shaped structure, the first heat exchange part is completely in contact with the water cooling plate in the holes of the L-shaped structure or the U-shaped structure made of the phase change material, the contact area with the water cooling plate is increased, the heat insulation pad is arranged on the L-shaped placing position or the U-shaped placing position, and under the condition that self heat insulation is completed, the heat exchange effect is good. And the phase change structure also increases direct heat exchange contact with the battery monomers, so that the heat exchange efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy battery heat insulation, and particularly relates to a fireproof and highly heat-conductive phase change heat insulation pad and a heat insulation structure for a battery module. Background Art

[0002] At present, most of the phase change aerogel heat insulation pads adopt an I-shaped structure. On the one hand, the low thermal conductivity of the phase change material cannot achieve heat transfer quickly, and the phase change material cannot absorb the heat generated by the battery quickly. On the other hand, the contact area between the I-shaped structure phase change material and the water cooling plate is small, and it cannot achieve rapid heat exchange with the water cooling plate, resulting in low heat exchange efficiency. Content of the Utility Model

[0003] The utility model provides a fireproof and highly heat-conductive phase change heat insulation pad and a heat insulation structure for a battery module to solve the deficiencies described in the above-mentioned prior art.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A fireproof and highly heat-conductive phase change heat insulation pad includes a phase change structure and a heat insulation member. The phase change structure includes a first heat exchange part and at least one second heat exchange part. The second heat exchange part is vertically arranged on the first heat exchange part, and the second heat exchange part and the first heat exchange part form a heat insulation accommodation position; the heat insulation member is arranged in the heat insulation accommodation position; the end face of the first heat exchange part away from the heat insulation member is used as the end face in contact with the water cooling plate. By changing the structure of the phase change structure and using the first heat exchange part as the end face in contact with the water cooling plate, the contact area with the battery cell and the water cooling plate is increased, and the heat exchange speed is accelerated.

[0006] As a preferred solution of the utility model, the second heat exchange part is one, and the heat insulation accommodation position formed by the first heat exchange part and the second heat exchange part is an L-shaped placement position. The heat insulation member is placed on the L-shaped placement position; the end face of the first heat exchange part facing the L-shaped placement position is the first heat exchange end face I, and the end face of the first heat exchange part opposite to the first heat exchange end face I is the first heat exchange end face II in contact with the water cooling plate; the end face of the second heat exchange part facing the L-shaped placement position is the second heat exchange end face I; the heat insulation member is in contact with the first heat exchange end face I and the second heat exchange end face I. The phase change structure is set to be L-shaped, increasing the contact area with the battery cell and the water cooling plate.

[0007] As a preferred solution of the utility model, the second heat exchange part is two, and the heat insulation accommodation position formed by the first heat exchange part and the two second heat exchange parts is a U-shaped placement position. The heat insulation member is placed in the U-shaped placement position. The phase change structure is set to be U-shaped, making the contact area between the phase change structure and the battery cell and the water cooling plate larger.

[0008] As a preferred embodiment of the present utility model, the phase change structure includes a metal foam member and a phase change material, and the phase change material is filled in the pores of the metal foam member. The metal foam member is made of metal foam, and can be fabricated using 3D printing, powder metallurgy, or a foaming agent process.

[0009] As a preferred embodiment of the present utility model, the pore diameters of the metal foam member are distributed in a gradient from the inside to the outside along the thickness direction of the second heat exchange portion; the outermost layer has small pore diameters, which can generate capillary force to ensure that the phase change material does not leak when it melts; the inner pore diameters gradually increase, which can increase the filling amount of the phase change material. Using 3D printing technology, the pore diameters formed when making the L-shaped metal foam can be controlled to present a stepped distribution.

[0010] Or the pore diameters of the metal foam member are the same from the inside to the outside along the thickness direction of the second heat exchange portion, and 3D printing technology is used to control the pore diameters.

[0011] Or the pore diameters of the metal foam member are disorderly distributed from the inside to the outside along the thickness direction of the second heat exchange portion. Fabricated using powder metallurgy and a foaming agent process, the pore sizes cannot be controlled, forming a disorderly and uneven porous structure.

[0012] As a preferred embodiment of the present utility model, the thickness ratio of the second heat exchange portion to the first heat exchange portion is 5:1 - 20:1.

[0013] As a preferred embodiment of the present utility model, the thickness ratio of the second heat exchange portion to the first heat exchange portion is 10:1 - 15:1.

[0014] The present utility model also provides a heat insulation structure for a battery module, including a water-cooled plate and the above-mentioned fireproof high thermal conductivity phase change heat insulation pad. The first heat exchange end face II is in direct contact with the water-cooled plate; the end face of the first heat exchange portion adjacent to the first heat exchange end face I is the first heat exchange end face III, and the first heat exchange end face III and the heat insulation member are in contact with the battery cell.

[0015] As a preferred embodiment of the present utility model, the end face of the second heat exchange portion opposite to the second heat exchange end face I is the second heat exchange end face II, and the second heat exchange end face II is in contact with another battery cell.

[0016] The present utility model also provides a heat insulation structure for a battery module, including a water-cooled plate and the above-mentioned thermal conductivity phase change heat insulation pad. The end face of the first heat exchange portion 11 away from the heat insulation member is in direct contact with the water-cooled plate; the end faces of the two second heat exchange portions away from the heat insulation member are both in contact with a battery cell.

[0017] In the present utility model, a foam metal is made into an L-shaped structure or a U-shaped structure, and a phase change material is placed in the pores of the L-shaped or U-shaped structure. The entire first heat exchange part is in contact with the water-cooled plate, increasing the contact area with the water-cooled plate. When the heat insulation pad is in the L-shaped placement position or the U-shaped placement position and completes its own heat insulation, the phase change structure also increases the direct heat exchange contact with the battery cell, accelerating the heat exchange efficiency. Moreover, the present utility model uses a porous foam metal as the matrix of the phase change material. On the one hand, it can fill more phase change materials to store a large amount of heat and keep the temperature fluctuation small. On the other hand, it can quickly transfer the heat of the battery cell to the water-cooled plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of the L-shaped fireproof high thermal conductivity phase change heat insulation pad of the present utility model.

[0020] Figure 2 It is an application schematic diagram of the L-shaped fireproof high thermal conductivity phase change heat insulation pad of the present utility model with only one battery cell installed.

[0021] Figure 3 It is an application schematic diagram of the L-shaped fireproof high thermal conductivity phase change heat insulation pad of the present utility model with two battery cells installed.

[0022] Figure 4 It is a schematic structural diagram of the U-shaped fireproof high thermal conductivity phase change heat insulation pad of the present utility model.

[0023] Figure 5 It is an application schematic diagram of the U-shaped fireproof high thermal conductivity phase change heat insulation pad of the present utility model.

[0024] Figure 6 It is a schematic structural diagram of the pore size gradient distribution of the foam metal part of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0026] Example 1:

[0027] A fireproof high - thermal - conductivity phase - change heat - insulating pad, as Figure 1 shown, includes a phase - change structure 1 and a heat - insulating member 2. The phase - change structure 1 is an L - shaped phase - change structure. The L - shaped phase - change structure 1 includes an L - shaped foam metal member and a phase - change material, and the phase - change material is filled in the pores of the L - shaped foam metal member. The phase - change material used can be an organic phase - change material or an inorganic phase - change material. When using an organic phase - change material, PEG, paraffin, fatty acid, or fatty alcohol can be used; when using an inorganic phase - change material, one or more of sodium nitrate, potassium nitrate, and lithium nitrate can be used.

[0028] The L - shaped foam metal member is made of foam metal and can be a porous structure made by 3D printing, powder metallurgy, and foaming agent processes.

[0029] When made by powder metallurgy and foaming agent processes, the pore diameters of the L - shaped foam metal member are disorderly distributed from the inside to the outside along the thickness direction of the second heat - exchange part 12. Because it is made by powder metallurgy and foaming agent processes, the pore size cannot be controlled, forming a porous structure that is disorderly and of different sizes.

[0030] When made by 3D printing technology, the pore diameters of the L - shaped foam metal member are gradient - distributed or uniformly distributed from the inside to the outside along the thickness direction of the second heat - exchange part 12. Specifically, according to actual production, when gradient - distributed, as Figure 6 shown, the L - shaped foam metal member has a first pore - diameter part 17, a second pore - diameter part 18, and a third pore - diameter part 19; the pore diameter of the first pore - diameter part is smaller than that of the second pore - diameter part, and the pore diameter of the second pore - diameter part is smaller than that of the third pore - diameter part; the second pore - diameter part and the first pore - diameter part are symmetrically arranged on both sides of the third pore - diameter part; and the first pore - diameter part is located outside the second pore - diameter part. The pore diameter of the first pore - diameter part is 10 nm - 100 μm; the pore diameter of the second pore - diameter part is 100 μm - 500 μm; the pore diameter of the third pore - diameter part is 500 μm - 1000 μm.

[0031] The outermost layer has small pore diameters, which can generate capillary force to ensure that the phase - change material does not leak when the phase - change material melts; the inner pore diameter gradually increases, which can increase the filling amount of the phase - change material.

[0032] Structurally, as Figure 1 shown, the phase - change structure 1 includes a first heat - exchange part 11 and a second heat - exchange part 12, and the thickness ratio of the second heat - exchange part 12 to the first heat - exchange part 11 is 5:1 - 20:1, preferably 10:1 - 15:1.

[0033] The first heat exchange part 11 and the second heat exchange part 12 form an L-shaped placement position, and the heat insulation part 2 is placed on the L-shaped placement position; the end face of the first heat exchange part 11 facing the L-shaped placement position is the first heat exchange end face I13, and the end face of the first heat exchange part 11 opposite to the first heat exchange end face I is the first heat exchange end face II14 in contact with the water-cooling plate 3; the end face of the second heat exchange part 12 facing the L-shaped placement position is the second heat exchange end face I15; the heat insulation part 2 is in contact with the first heat exchange end face I and the second heat exchange end face I. The phase change structure is set to be L-shaped to increase the contact area with the battery cell and the water-cooling plate and accelerate the heat exchange speed.

[0034] Applying the fireproof highly thermally conductive phase change heat insulation pad to the battery module can obtain a heat insulation structure for the battery module. As Figure 2 shown, it includes a water-cooling plate 3 and the fireproof highly thermally conductive phase change heat insulation pad as described above. The first heat exchange end face II is directly in contact with the water-cooling plate. The end face of the first heat exchange part 11 adjacent to the first heat exchange end face I is the first heat exchange end face III16, and the first heat exchange end face III and the heat insulation part 2 are in contact with the battery cell 4. The first heat exchange end face II quickly transfers the heat exchanged by the second heat exchange end face I, the first heat exchange end face I, and the first heat exchange end face III to the water-cooling plate to achieve rapid cooling.

[0035] Of course, in specific applications, the end face of the second heat exchange part 12 opposite to the second heat exchange end face I is the second heat exchange end face II, and the second heat exchange end face II is in contact with another battery cell. As Figure 3 shown, that is, two adjacent battery cells share one fireproof highly thermally conductive phase change heat insulation pad.

[0036] In this embodiment, the heat insulation part used is an aerogel heat insulation pad, which can be a frameless structure aerogel heat insulation pad or a framed structure aerogel heat insulation pad; when it is a frameless structure aerogel heat insulation pad, the heat insulation part includes double-sided tape, organic film material, and aerogel felt; when it is a framed structure aerogel heat insulation pad, the heat insulation part includes: double-sided tape, organic film material, a return frame filled with aerogel felt inside the return frame. The return frame can use a flame-retardant silicone rubber frame, a ceramic silicone rubber frame, an MPP frame, or a PP frame.

[0037] Whether it is a frameless structure aerogel heat insulation pad or a framed structure aerogel heat insulation pad, the organic film material used can be PP, PC, PU, PI, or PET; the aerogel felt used is a pre-oxidized fiber aerogel felt, a ceramic fiber aerogel felt, a basalt fiber aerogel felt, or a glass fiber aerogel felt.

[0038] Embodiment 2:

[0039] A fireproof highly thermally conductive phase change heat insulation pad, as Figure 4As shown in the figure, there are two second heat exchange parts 12. The first heat exchange part 11 and the two second heat exchange parts 12 form a U-shaped phase change structure, and the formed heat insulation accommodation position is a U-shaped placement position, and the heat insulation part 2 is placed into the U-shaped placement position. And applying the fireproof high thermal conductivity phase change heat insulation pad to the battery module can obtain a heat insulation structure for the battery module, such as Figure 5 As shown in the figure, it includes a water cooling plate 3 and the above-mentioned thermal conductivity phase change heat insulation pad. The end face of the first heat exchange part 11 away from the heat insulation part is directly in contact with the water cooling plate; the end faces of the two second heat exchange parts away from the heat insulation part are both in contact with a battery cell, and the rest are the same as those in Embodiment 1.

[0040] In the description of this specification, the descriptions with reference to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0041] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A fireproof high thermal conductivity phase change heat insulation pad, characterized in that: It includes a phase change structure (1) and a heat insulation member (2). The phase change structure (1) includes a first heat exchange part (11) and at least one second heat exchange part (12). The second heat exchange part (12) is vertically arranged on the first heat exchange part (11), and the second heat exchange part (12) and the first heat exchange part (11) form a heat insulation accommodation position; the heat insulation member (2) is arranged in the heat insulation accommodation position; the end face of the first heat exchange part (11) away from the heat insulation member is used as the end face in contact with the water-cooled plate.

2. The fireproof high thermal conductivity phase change heat insulation pad according to claim 1, wherein: The second heat exchange part (12) is one. The heat insulation accommodation position formed by the first heat exchange part (11) and the second heat exchange part (12) is an L-shaped placement position, and the heat insulation member (2) is placed on the L-shaped placement position; the end face of the first heat exchange part (11) facing the L-shaped placement position is the first heat exchange end face I, and the end face of the first heat exchange part (11) opposite to the first heat exchange end face I is the first heat exchange end face II in contact with the water-cooled plate; the end face of the second heat exchange part (12) facing the L-shaped placement position is the second heat exchange end face I; the heat insulation member (2) is in contact with the first heat exchange end face I and the second heat exchange end face I.

3. The fireproof high thermal conductivity phase change heat insulation pad according to claim 1, wherein: The second heat exchange part (12) is two. The heat insulation accommodation position formed by the first heat exchange part (11) and the two second heat exchange parts (12) is a U-shaped placement position, and the heat insulation member (2) is placed in the U-shaped placement position.

4. The fireproof high thermal conductivity phase change heat insulation pad according to claim 2 or 3, characterized in that: The thickness ratio of the second heat exchange part (12) to the first heat exchange part (11) is 5:1 - 20:

1.

5. The fireproof high thermal conductivity phase change heat insulation pad according to claim 4, characterized in that: The thickness ratio of the second heat exchange part (12) to the first heat exchange part (11) is 10:1 - 15:

1.

6. A heat insulation structure for a battery module, characterized in that: It includes a water-cooled plate (3) and the fireproof high thermal conductivity phase change heat insulation pad as described in claim 2. The first heat exchange end face II is directly in contact with the water-cooled plate; the end face of the first heat exchange part (11) adjacent to the first heat exchange end face I is the first heat exchange end face III, and the first heat exchange end face III and the heat insulation member (2) are in contact with the battery cell.

7. The heat insulation structure for a battery module according to claim 6, wherein: The end face of the second heat exchange part (12) opposite to the second heat exchange end face I is the second heat exchange end face II, and the second heat exchange end face II is in contact with another battery cell.

8. A heat insulation structure for a battery module, characterized in that: It includes a water-cooled plate (3) and the fireproof high thermal conductivity phase change heat insulation pad as described in claim 3. The end face of the first heat exchange part (11) away from the heat insulation member is directly in contact with the water-cooled plate; both end faces of the two second heat exchange parts away from the heat insulation member are in contact with a battery cell.

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