Liquid cooling plate heat preservation structure and battery pack shell

Abstract

The utility model provides a liquid cooling plate heat preservation structure and a battery pack shell. The heat preservation structure of the liquid cooling plate is used for heat insulation and heat preservation of the liquid cooling plate integrated on a battery pack shell, and comprises a heat preservation cotton layer which covers one side, facing the outside of the battery pack shell, of the liquid cooling plate; and the partition plate is arranged between the liquid cooling plate and the heat preservation cotton layer, and the liquid cooling plate and the heat preservation cotton layer are separated by the partition plate. According to the heat preservation structure of the liquid cooling plate, the heat preservation cotton layer can be separated from the liquid cooling plate through the arrangement of the partition plate, moisture in the heat preservation cotton layer is prevented from making contact with the liquid cooling plate, the heat preservation and insulation effects are guaranteed, meanwhile, corrosion to the liquid cooling plate is reduced, and therefore the service life of the liquid cooling plate is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a liquid cooling plate insulation structure. The utility model also relates to a battery pack housing provided with the liquid cooling plate insulation structure. Background Art

[0002] With the development of electric vehicles, the thermal safety of electric vehicle power batteries has become one of the important performance indicators of electric vehicles. In power batteries, the battery pack shell is equipped with multiple cells arranged in a certain arrangement. When the power battery is working, since each cell is arranged in a relatively small shell, heat will accumulate and cause the temperature in the battery pack to exceed its normal operating temperature. If the heat cannot be dissipated in time, it will cause the battery performance to decay faster, reduce the service life and even cause the battery to catch fire. Therefore, it is particularly important to dissipate the heat of the cells in the battery pack.

[0003] At present, the cooling of battery modules usually adopts the method of setting a liquid cooling plate, which is placed against the outer surface of the battery module, so that the coolant in the flow channel of the liquid cooling plate can also absorb heat and transfer the heat to the cooling mechanism outside the battery pack. At the same time, in order to facilitate the setting of the liquid cooling plate in the battery pack and improve the compactness of the battery pack, the liquid cooling plate is usually integrated on the battery pack shell.

[0004] Since the liquid cooling plate is integrated on the battery pack shell, one side of the liquid cooling plate is exposed to the outside of the battery pack. At this time, the liquid cooling plate will form heat transfer with the external environment of the battery pack, resulting in a decrease in the cooling effect of the liquid cooling plate on the battery pack module in the battery pack. In order to avoid the decrease in the cooling effect of the liquid cooling plate, the liquid cooling plate is usually covered with a thermal insulation layer to improve the thermal insulation performance of the liquid cooling plate.

[0005] However, the thermal insulation cotton layer is directly covered on the liquid cooling plate, which makes it easy for the thermal insulation cotton layer to absorb water vapor in the external environment of the battery pack or condensed water generated by the cooling of the liquid cooling plate, causing moisture accumulation on the outer surface of the liquid cooling plate. The liquid cooling plate is in a humid environment for a long time, which can easily cause corrosion to the liquid cooling plate and reduce the service life of the liquid cooling plate. Utility Model Content

[0006] In view of this, the utility model aims to provide a liquid cooling plate insulation structure, which can reduce the corrosion of the liquid cooling plate while ensuring the thermal insulation effect, thereby increasing the service life of the liquid cooling plate.

[0007] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0008] A liquid cooling plate insulation structure is used to insulate and heat the liquid cooling plate integrated on a battery pack shell, comprising: a thermal insulation cotton layer covering the side of the liquid cooling plate facing the outside of the battery pack shell; a partition arranged between the liquid cooling plate and the thermal insulation cotton layer, the partition separating the liquid cooling plate from the thermal insulation cotton layer.

[0009] Furthermore, the partition plate is spaced apart from the liquid cooling plate.

[0010] Furthermore, an edge extending toward the liquid cooling plate is formed at the periphery of the partition; the edge is connected to the edge of the liquid cooling plate, so that the partition and the liquid cooling plate form a heat-insulating cavity.

[0011] Furthermore, the edge is connected to the edge of the liquid cooling plate by welding.

[0012] Furthermore, a distance L between the partition and the liquid cooling plate satisfies: L≥8mm.

[0013] Furthermore, a vacuum joint connected to the thermal insulation cavity is provided on the edge, and the gas in the thermal insulation cavity is extracted to the outside of the thermal insulation cavity via the vacuum joint.

[0014] Furthermore, the relative pressure P in the insulation cavity satisfies: -115kPa≤P≤-85kPa.

[0015] Furthermore, the outer surface of the partition is coated with an anti-corrosion layer.

[0016] Furthermore, the liquid cooling plate is integrated on the top wall or the bottom wall of the battery pack shell.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The liquid cooling plate insulation structure described in the utility model can separate the insulation cotton layer from the liquid cooling plate by setting a partition, thereby preventing moisture in the insulation cotton layer from contacting the liquid cooling plate, while ensuring the insulation effect and reducing corrosion to the liquid cooling plate, thereby increasing the service life of the liquid cooling plate.

[0019] By setting the partition and the liquid cooling plate at a distance, the heat transfer effect between the liquid cooling plate and the partition is reduced, making it difficult for the heat of the external environment to be transferred to the liquid cooling plate through the insulation cotton layer and the partition, thereby improving the thermal insulation effect.

[0020] By setting an edge connected to the liquid cooling plate, an insulating cavity is formed, which reduces the contact area between the liquid cooling plate and the partition. By utilizing the good thermal insulation performance of the insulating cavity, it is difficult for the heat of the external environment to be transferred to the liquid cooling plate, thereby improving the thermal insulation and cooling effect.

[0021] The edge is connected to the liquid cooling plate by welding, which can improve the connection strength between the partition and the liquid cooling plate, improve the stability of the partition fixation, and can improve the sealing effect of the insulation cavity by welding, thereby improving the insulation performance of the insulation cavity.

[0022] The distance L between the partition and the liquid cooling plate is ≥8mm, so that there is a sufficient insulation distance between the partition and the liquid cooling plate, further improving the insulation effect of the insulation cavity.

[0023] A vacuum joint connected to the insulation cavity is provided on the edge. Through the setting of the vacuum joint, the gas in the insulation cavity can be extracted, so that the insulation cavity is evacuated, thereby improving the insulation performance of the insulation cavity and enhancing the thermal insulation effect.

[0024] The relative pressure P in the insulation cavity satisfies: -115kPa≤P≤-85kPa, so as to improve the structural stability of the partition and the insulation cavity while ensuring the insulation effect.

[0025] By coating the partition with an anti-corrosion layer, the corrosion effect of external moisture on the partition can be reduced to a certain extent, thereby increasing the service life of the liquid cooling plate insulation structure.

[0026] The liquid cooling plate is integrated on the top wall or bottom wall of the battery pack shell, so that the liquid cooling plate has a larger cooling area to improve the cooling effect on the battery module, and at the same time facilitates the installation and setting of the liquid cooling plate insulation structure.

[0027] Another object of the present utility model is to provide a battery pack shell, on which a liquid cooling plate is integrated, and on which the liquid cooling plate insulation structure as described above is provided.

[0028] The battery pack shell and / or the liquid cooling plate insulation structure described in the present invention have the same beneficial effects as those of the prior art, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of the overall structure of the liquid cooling plate insulation structure according to the first embodiment of the present utility model;

[0031] Figure 2 This is an exploded view of the liquid cooling plate insulation structure according to the first embodiment of the present utility model;

[0032] Figure 3 For the utility model Figure 1 A partial cross-sectional view of the position indicated by AA;

[0033] Description of reference numerals:

[0034] 1. Liquid cooling plate; 101. Connecting seat;

[0035] 2. partition; 201. edge; 202. vacuum joint;

[0036] 3. Thermal insulation cotton layer; 4. Thermal insulation cavity. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0038] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0039] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0042] Embodiment 1

[0043] This embodiment relates to a liquid cooling plate insulation structure for heat insulation of a liquid cooling plate 1 integrated on a battery pack housing. Figure 1 , Figure 2As shown, the liquid cooling plate insulation structure of this embodiment includes an insulation cotton layer 3 and a partition 2.

[0044] The heat-insulating cotton layer 3 covers the side of the liquid cooling plate 1 facing the outside of the battery pack shell, and the partition 2 is arranged between the liquid cooling plate 1 and the heat-insulating cotton layer 3, and the partition 2 can separate the liquid cooling plate 1 from the heat-insulating cotton layer 3. The moisture in the heat-insulating cotton layer 3 can only contact with the partition 2, and will not accumulate on the outer surface of the liquid cooling plate 1 and contact with the liquid cooling plate 1 for a long time, so that the partition 2 protects the liquid cooling plate 1.

[0045] As described above, the liquid cooling plate insulation structure of the present embodiment can separate the insulation cotton layer 3 from the liquid cooling plate 1 by setting the partition 2, thereby preventing moisture in the insulation cotton layer 3 from contacting the liquid cooling plate 1. While ensuring the thermal insulation effect, it reduces corrosion to the liquid cooling plate 1, thereby increasing the service life of the liquid cooling plate 1.

[0046] Based on the above overall introduction, specifically, the liquid inlet and outlet of the liquid cooling plate 1 of this embodiment are integrated in a connecting seat 101, and the connecting seat 101 is arranged on a side surface of the liquid cooling plate 1 facing the inside of the battery pack shell. Through the connecting seat 101, the liquid inlet and outlet can be fixed on the side wall of the battery pack shell and penetrate the battery pack shell to facilitate the external cooling liquid circulation pipeline to be connected to the liquid cooling plate 1.

[0047] In addition, during specific implementation, the thermal insulation cotton layer 3 of this embodiment can be bonded to the partition plate 2 by structural adhesive to facilitate the fixation of the thermal insulation cotton layer 3.

[0048] Since the thermal insulation cotton layer 3 will absorb a certain amount of moisture, the thermal insulation performance of the thermal insulation cotton layer 3 will decrease. Therefore, in order to ensure the thermal insulation effect of the liquid cooling plate insulation structure, the partition 2 of this embodiment is spaced apart from the liquid cooling plate 1, which reduces the heat transfer effect between the liquid cooling plate 1 and the partition 2, making it difficult for the heat from the external environment to be transferred to the liquid cooling plate 1 through the thermal insulation cotton layer 3 and the partition 2, thereby improving the thermal insulation effect of the liquid cooling plate insulation structure of this embodiment.

[0049] In order to further improve the thermal insulation effect of the liquid cooling plate insulation structure, such as Figure 1 , Figure 2 and Figure 3As shown, the periphery of the partition 2 of this embodiment is formed with an edge 201 extending toward the liquid cooling plate 1, and the edge 201 is connected to the edge of the liquid cooling plate 1, so that the partition 2 and the liquid cooling plate 1 are surrounded by an insulating cavity 4, which reduces the contact area between the liquid cooling plate 1 and the partition 2, and the insulating cavity 4 has a good insulating effect, making it difficult for the heat of the external environment to be transferred to the liquid cooling plate 1, thereby improving the thermal insulation and cooling effect of the liquid cooling plate insulation structure of this embodiment. At the same time, due to the setting of the insulating cavity 4, the heat transfer effect between the liquid cooling plate 1 and the partition 2 is poor, thereby reducing the generation of condensed water to a certain extent, and reducing the absorption of moisture by the thermal insulation cotton layer 3, thereby improving the thermal insulation effect. In addition, the edge 201 of the partition 2 is connected to the edge of the liquid cooling plate 1, which can improve the anti-bending performance of the liquid cooling plate 1, thereby improving the liquid cooling plate 1, that is, the structural strength of the battery pack shell.

[0050] In order to improve the stability of the connection between the partition 2 and the liquid cooling plate 1, and at the same time improve the sealing effect of the heat insulation cavity 4. The edge 201 of this embodiment is connected to the edge of the liquid cooling plate 1 by welding, which can improve the connection strength between the partition 2 and the liquid cooling plate 1, improve the stability of the partition 2 fixation, and improve the sealing effect of the heat insulation cavity 4 by welding, thereby improving the heat insulation performance of the heat insulation cavity 4. In specific implementation, the edge 201 and the liquid cooling plate 1 can be welded and connected by carbon dioxide shielded welding, and the connection strength and sealing effect at the welding seam are better. Of course, other conventional welding methods can also be used to ensure the stable connection between the partition 2 and the liquid cooling plate 1.

[0051] In order to further improve the thermal insulation performance of the thermal insulation cavity 4, the spacing L between the partition 2 and the liquid cooling plate 1 of this embodiment satisfies: L ≥ 8mm. When the spacing between the partition 2 and the liquid cooling plate 1 is too small, even if a certain distance is left between the partition 2 and the liquid cooling plate 1, the heat of the external environment can also be transferred to the liquid cooling plate 1 through the partition 2 via the gas between the partition 2 and the liquid cooling plate 1, thereby resulting in a decrease in the cooling effect of the liquid cooling plate 1. Therefore, the setting of the above-mentioned spacing L allows sufficient thermal insulation spacing between the partition 2 and the liquid cooling plate 1, making it difficult for heat to be transferred to the liquid cooling plate 1 via the gas between the partition 2 and the liquid cooling plate 1, thereby further improving the thermal insulation effect of the thermal insulation cavity 4. In specific implementation, in order to minimize the volume of the thermal insulation structure of the liquid cooling plate, the spacing L between the partition 2 and the liquid cooling plate 1 of this embodiment can be selected as 10mm. While ensuring sufficient thermal insulation spacing, the volume of the thermal insulation structure of the liquid cooling plate is reduced, thereby improving the compactness of the battery pack. Of course, the spacing L can also be selected from other values ​​within this atmosphere, and no specific limitation is made here.

[0052] Since there is a certain amount of gas in the insulation cavity 4, although the gas is a poor conductor of heat, the presence of the gas in the insulation cavity 4 will still transfer heat to the liquid cooling plate 1. In order to further improve the thermal insulation effect of the liquid cooling plate 1 in this embodiment, a vacuum joint 202 connected to the insulation cavity 4 is provided on the edge 201 of this embodiment, and the gas in the insulation cavity 4 is extracted to the outside of the insulation cavity 4 via the vacuum joint 202.

[0053] It is understandable that when the gas in the insulation cavity 4 is extracted, the gas pressure in the insulation cavity 4 decreases, the corresponding gas density will also decrease, the mean free path of the gas molecules will increase, and the collision frequency and intensity between the gas molecules and the inner wall of the insulation cavity 4 will be relatively weakened, thereby causing the heat transfer effect of the insulation cavity 4 to decrease. Therefore, by setting the vacuum joint 202, the gas in the insulation cavity 4 can be extracted, so that the insulation cavity 4 is evacuated, thereby improving the insulation performance of the insulation cavity 4, and improving the thermal insulation effect of the cooling structure of the liquid cooling plate 1 of this embodiment.

[0054] The relative pressure P in the insulation cavity 4 of this embodiment satisfies: -115kPa≤P≤-85kPa. When the value of the relative pressure in the insulation cavity 4 is too large, that is, the difference between the air pressure in the insulation cavity 4 and the atmospheric pressure is small, the vacuum degree in the insulation cavity 4 is insufficient, and the thermal insulation performance of the insulation cavity 4 cannot meet the thermal insulation needs. When the value of the relative pressure in the insulation cavity 4 is too small, that is, the difference between the air pressure in the insulation cavity 4 and the atmospheric pressure is large, since the partition 2 is a plate-like structure, the atmospheric pressure exerts a large pressure on the partition 2, which can easily cause the partition 2 to deform and dent due to the atmospheric pressure, and easily cause the structure of the partition 2 to be destroyed, resulting in leakage of the insulation cavity 4. In specific implementation, the relative pressure P can be selected to be -100kPa, which can improve the structural stability of the partition 2 and the insulation cavity 4 while ensuring the thermal insulation effect, thereby improving the thermal insulation effect of the liquid cooling plate insulation structure.

[0055] Since the insulation cotton layer 3 covers the partition 2, when the insulation cotton layer 3 absorbs a certain amount of moisture, the moisture accumulates on the partition 2 and will easily cause corrosion to the partition 2, resulting in the destruction of the structure of the partition 2 and the sealing of the insulation cavity 4, thereby reducing the insulation and cooling effect of the insulation structure of the liquid cooling plate 1. Therefore, in order to reduce the corrosion of the partition 2, the outer surface of the partition 2 of this embodiment is coated with an anti-corrosion layer. Through the provision of the anti-corrosion layer, the corrosion effect of external moisture on the partition 2 can be reduced to a certain extent, thereby improving the service life of the insulation structure of the liquid cooling plate. In specific implementation, the anti-corrosion layer of this embodiment adopts conventional anti-corrosion coatings well known to those skilled in the art, such as epoxy resin coatings, etc., which can be coated and stably maintained on the outer surface of the partition 2.

[0056] In order to facilitate the installation of the liquid cooling plate 1 and the thermal insulation structure of the liquid cooling plate 1, the liquid cooling plate 1 of the present embodiment is integrated on the top wall or the bottom wall of the battery pack shell, so that the liquid cooling plate 1 has a larger cooling area to improve the cooling effect on the battery module, while facilitating the installation of the thermal insulation structure of the liquid cooling plate 1.

[0057] In summary, the liquid cooling plate insulation structure of this embodiment can separate the insulation cotton layer 3 from the liquid cooling plate 1 through the setting of the partition 2, so as to prevent the moisture in the insulation cotton layer 3 from contacting the liquid cooling plate 1. While ensuring the thermal insulation effect, it reduces the corrosion of the liquid cooling plate 1, thereby improving the service life of the liquid cooling plate 1 and has good practicality.

[0058] Embodiment 2

[0059] The present embodiment relates to a battery pack housing, on which a liquid cooling plate 1 is integrated. The battery pack housing of the present embodiment is provided with a liquid cooling plate insulation structure as described in the first embodiment.

[0060] By setting up the liquid cooling plate insulation structure, it can not only play a heat insulation effect on the liquid cooling plate 1 on the battery pack shell, but also reduce the corrosion of the liquid cooling plate 1, thereby increasing the service life of the liquid cooling plate 1 and the battery pack shell.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid cooling plate insulation structure, used for heat insulation of a liquid cooling plate integrated on a battery pack housing, characterized in that: include: A heat-insulating cotton layer, covering a side of the liquid cooling plate facing the outside of the battery pack shell; A partition is arranged between the liquid cooling plate and the thermal insulation cotton layer, and the partition separates the liquid cooling plate from the thermal insulation cotton layer.

2. The liquid cooling plate insulation structure according to claim 1, characterized in that: The partition plate is spaced apart from the liquid cooling plate.

3. The liquid cooling plate insulation structure according to claim 2, characterized in that: The partition is formed with an edge extending toward the liquid cooling plate at its periphery; The edge is connected to the edge of the liquid cooling plate, so that the partition plate and the liquid cooling plate form a heat insulation cavity.

4. The liquid cooling plate insulation structure according to claim 3, characterized in that: The edge is connected to the edge of the liquid cooling plate by welding.

5. The liquid cooling plate insulation structure according to claim 3, characterized in that: The distance L between the partition and the liquid cooling plate satisfies: L≥8mm.

6. The liquid cooling plate insulation structure according to claim 3, characterized in that: A vacuum joint communicating with the heat-insulating cavity is provided on the edge, and the gas in the heat-insulating cavity is extracted to the outside of the heat-insulating cavity via the vacuum joint.

7. The liquid cooling plate insulation structure according to claim 6, characterized in that: The relative pressure P in the insulation cavity satisfies: -115kPa≤P≤-85kPa.

8. The liquid cooling plate insulation structure according to any one of claims 1 to 7, characterized in that: The outer surface of the separator is coated with an anti-corrosion layer.

9. The liquid cooling plate insulation structure according to any one of claims 1 to 7, characterized in that: The liquid cooling plate is integrated on the top wall or the bottom wall of the battery pack housing.

10. A battery pack housing, wherein a liquid cooling plate is integrated on the battery pack housing, characterized in that: The battery pack shell is provided with a liquid cooling plate insulation structure according to any one of claims 1 to 9.

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