Battery liquid cooling pipeline and battery management system

Abstract

The embodiment of the application provides a battery liquid cooling pipeline and a battery management system. The battery liquid cooling pipeline comprises a pipeline body for conveying refrigerant; the pipeline body has an outer surface in a radial direction; a first structure support layer is formed at the outer surface; a first thermal insulation layer is formed on a side of the first structure support layer away from the pipeline body; and a flame-retardant layer is formed on a side of the first thermal insulation layer away from the pipeline body. Through the cooperation of the first structure support layer, the first thermal insulation layer and the flame-retardant layer, the stability of the pipeline body can be improved, especially in the case that the battery is in thermal runaway and high-temperature gas is sprayed out, the pipeline body can be prevented from melting, rupturing or sealing failure under the impact of the high-temperature gas, and the heat of the external environment can be prevented from being transferred to the refrigerant conveyed in the pipeline body, so that the refrigerant can continuously exchange heat with the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery liquid cooling pipeline and battery management system. Background Technology

[0002] During thermal runaway, the power battery will generate high-temperature gas, which will impact the liquid cooling pipeline inside the power battery when it is released.

[0003] Existing liquid cooling pipelines are mostly made of polymer materials, which makes them prone to melting, cracking or sealing failure under the impact of high-temperature gases, resulting in poor stability in use. Utility Model Content

[0004] This application provides a battery liquid cooling pipeline and a battery management system, which can avoid problems such as melting, cracking or sealing failure of the pipeline body under the impact of high temperature gas, and improve the structural stability of the pipeline body.

[0005] In a first aspect, embodiments of this application provide a battery liquid cooling pipeline, including...

[0006] A pipeline body for conveying refrigerant; the pipeline body has an outer surface in the radial direction;

[0007] A first structural support layer is formed on the outer surface;

[0008] A first thermal insulation layer is formed on the side of the first structural support layer away from the pipeline body;

[0009] A flame-retardant layer is formed on the side of the first insulation layer away from the pipe body.

[0010] In one possible implementation, the first structural support layer is a ceramic-based material layer, a metal-based composite layer, or an inorganic non-metallic layer.

[0011] In one possible implementation, the pipe body has a thickness dimension H along the radial direction of the pipe body, and the first structural support layer has a thickness dimension D1, wherein the ratio of D1 to H is 0.001-0.005.

[0012] In one possible implementation, the first insulation layer is a ceramic insulation layer, an aerogel insulation layer, a glass wool composite insulation layer, or an organic insulation layer.

[0013] In one possible implementation, the pipe body has a thickness dimension H along the radial direction of the pipe body, and the first insulation layer has a thickness dimension D2, wherein the ratio of D2 to H is 0.025-0.075.

[0014] In one possible implementation, one or more heat dissipation holes are provided at the first heat insulation layer; the diameter of the heat dissipation holes gradually decreases along the radial direction of the pipe body and along the direction close to the pipe body.

[0015] In one possible implementation, the heat dissipation hole is embedded with a phase change material.

[0016] In one possible implementation, at least a portion of the flame-retardant layer is an intumescent layer and / or a thermochromic layer.

[0017] In one possible implementation, the pipe body has a thickness dimension H along the radial direction of the pipe body, and the flame retardant layer has a thickness dimension D3, wherein the ratio of D3 to H is 0.0125-0.0375.

[0018] Secondly, embodiments of this application provide a battery management system, including,

[0019] Monitoring equipment;

[0020] Such as the battery liquid cooling pipeline mentioned above;

[0021] The monitoring device is used to monitor in real time at least one of the volume and color of the flame-retardant layer of the battery liquid cooling pipeline.

[0022] This application provides a battery liquid cooling pipeline and battery management system. By simultaneously providing a first structural support layer, a first heat insulation layer, and a flame retardant layer on the outer surface of the pipeline body, with the first structural support layer directly disposed on the outer surface, the first heat insulation layer disposed on the side of the first structural support layer away from the pipeline body, and the flame retardant layer disposed on the side of the first heat insulation layer away from the pipeline body, the synergistic protection of the first structural support layer, the first heat insulation layer, and the flame retardant layer can significantly improve the stability of the pipeline body. Especially in the event of thermal runaway of the battery and the emission of high-temperature gases, it can prevent the pipeline body from melting, cracking, or failing to seal under the impact of high-temperature gases, and can also prevent heat from the external environment from being transferred to the refrigerant transported inside the pipeline body, thereby enabling the refrigerant to continuously exchange heat with the battery. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0024] Figure 1 A schematic diagram of a battery liquid cooling pipeline provided in some embodiments of this application;

[0025] Figure 2 This is a cross-sectional view of a battery liquid cooling pipeline provided in some embodiments of this application.

[0026] Figure label:

[0027] 100. Pipe body; 110. Outer surface; 120. Inner surface;

[0028] 200. First structural support layer;

[0029] 300, First heat insulation layer; 310, First heat dissipation hole; 320, First paraffin microcapsule;

[0030] 400, Flame-retardant layer;

[0031] 500. Second structural support layer;

[0032] 600, Second heat insulation layer; 610, Second heat dissipation hole; 620, Second paraffin microcapsule.

[0033] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0034] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0035] During thermal runaway, the power battery will generate high-temperature gas, which will impact the liquid cooling pipeline inside the power battery when it is released.

[0036] Existing liquid cooling pipelines are mostly made of polymer materials, which makes them prone to melting, cracking or sealing failure under the impact of high-temperature gases, resulting in poor stability in use.

[0037] This application provides a battery liquid cooling pipeline and battery management system. By simultaneously providing a first structural support layer, a first heat insulation layer, and a flame retardant layer on the outer surface of the pipeline body, with the first structural support layer directly disposed on the outer surface, the first heat insulation layer disposed on the side of the first structural support layer away from the pipeline body, and the flame retardant layer disposed on the side of the first heat insulation layer away from the pipeline body, the synergistic protection of the first structural support layer, the first heat insulation layer, and the flame retardant layer can significantly improve the stability of the pipeline body. Especially in the event of thermal runaway of the battery and the emission of high-temperature gases, it can prevent the pipeline body from melting, cracking, or failing to seal under the impact of high-temperature gases, and can also prevent heat from the external environment from being transferred to the refrigerant transported inside the pipeline body, thereby enabling the refrigerant to continuously exchange heat with the battery.

[0038] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0039] Firstly, see [the following] Figure 1 As shown, this application embodiment provides a battery liquid cooling pipeline, including a pipeline body 100, which is used to transport a refrigerant, which is not limited to gas or liquid; in the radial direction of the pipeline body 100, the pipeline body 100 has an outer surface 110.

[0040] Furthermore, in this embodiment of the application, a first structural support layer 200 is provided on one side of the outer surface 110 of the pipeline body 100. The first structural support layer 200 can provide support for the pipeline body 100 to improve the structural strength of the pipeline body 100 and prevent the pipeline body 100 from collapsing under the influence of the external environment. In particular, when the battery experiences thermal runaway and emits high-temperature gas, it can prevent the pipeline body 100 from collapsing under the impact of high-temperature gas.

[0041] Furthermore, in this embodiment of the application, a first heat insulation layer 300 is provided on one side of the outer surface 110 of the pipeline body 100. The first heat insulation layer 300 can isolate the temperature of the external environment of the pipeline body 100, thereby preventing the pipeline body 100 from being affected by the external environment. Especially in the case of thermal runaway of the battery and the emission of high-temperature gas, it can prevent the pipeline body 100 from melting and cracking under the impact of high-temperature gas, resulting in collapse. It can also prevent the heat of the external environment from being transferred to the refrigerant transported inside the pipeline body 100, thereby enabling the refrigerant to continuously exchange heat with the battery.

[0042] Furthermore, in this embodiment of the application, a flame-retardant layer 400 is provided on one side of the outer surface 110 of the pipeline body 100. The flame-retardant layer 400 can provide a relatively sealed environment for the pipeline body 100, especially in the event of thermal runaway of the battery, which can ensure the structural stability of the pipeline body 100.

[0043] It should be noted that, in some embodiments, at least one of a first structural support layer 200, a first heat insulation layer 300, and a flame-retardant layer 400 may be provided on the outer surface 110 of the pipe body 100, all of which can provide protection for the pipe body 100. In some embodiments, the first structural support layer 200 and the first heat insulation layer 300 may be provided simultaneously on the outer surface 110 of the pipe body 100, with the first structural support layer 200 directly disposed on the outer surface 110 and the first heat insulation layer 300 disposed on the side of the first structural support layer 200 away from the pipe body 100. In some embodiments, the first structural support layer 200 and the flame-retardant layer 400 may be provided simultaneously on the outer surface 110 of the pipe body 100, with the first structural support layer 200 directly disposed on the outer surface 110 and the flame-retardant layer 400 disposed on the side of the first heat insulation layer 300 away from the pipe body 100. In some embodiments, a first heat insulation layer 300 and a flame retardant layer 400 may be simultaneously provided on the outer surface 110 of the pipeline body 100. The first heat insulation layer 300 is directly provided on the outer surface 110, and the flame retardant layer 400 is provided on the side of the first heat insulation layer 300 away from the pipeline body 100.

[0044] In this embodiment, a first structural support layer 200, a first heat insulation layer 300, and a flame retardant layer 400 are simultaneously disposed on the outer surface 110 of the pipeline body 100. The first structural support layer 200 is directly disposed on the outer surface 110, the first heat insulation layer 300 is disposed on the side of the first structural support layer 200 away from the pipeline body 100, and the flame retardant layer 400 is disposed on the side of the first heat insulation layer 300 away from the pipeline body 100. Through the synergistic protection of the first structural support layer 200, the first heat insulation layer 300, and the flame retardant layer 400, the stability of the pipeline body 100 can be significantly improved. Especially in the event of thermal runaway of the battery and the emission of high-temperature gas, it can prevent the pipeline body 100 from melting, cracking, or failing to seal under the impact of high-temperature gas. It can also prevent heat from the external environment from being transferred to the refrigerant transported inside the pipeline body 100, thereby enabling the refrigerant to continuously exchange heat with the battery.

[0045] In some embodiments, the first structural support layer 200 is a ceramic-based material layer, a metal-based composite layer, or an inorganic non-metallic layer; wherein, the ceramic-based material layer can be an oxide ceramic layer, a silicon nitride ceramic layer, or a silicon carbide ceramic layer; the metal-based composite layer can be an aluminum-based ceramic composite coating or a titanium-based high-temperature resistant coating; and the inorganic non-metallic layer can be a mullite coating.

[0046] In this embodiment, the first structural support layer 200 is a ceramic-based material layer. Since the ceramic-based material layer can withstand temperatures up to 800 degrees Celsius, the first structural support layer 200 can maintain good structural stability in high-temperature environments. When the first structural support layer 200 is disposed on the outer surface 110 of the pipeline body 100, when the battery experiences thermal runaway and emits high-temperature gas, the first structural support layer 200 can stably support the pipeline body 100, thereby preventing the pipeline body 100 from collapsing.

[0047] Furthermore, in this embodiment, the material of the pipeline body 100 is aluminum or copper alloy, and the first structural support layer 200 is formed on the outer surface 110 of the pipeline body 100 by plasma electrolytic oxidation technology, thereby enabling the first structural support layer 200 to form a metallurgical bond with the outer surface 110 of the pipeline body 100, so that the first structural support layer 200 can be stably attached to the outer surface 110, thereby improving the protective effect of the first structural support layer 200 on the pipeline body 100.

[0048] In some implementations, see Figure 2 As shown, along the radial direction of the pipe body 100, the pipe body 100 has a thickness dimension H, and the first structural support layer 200 has a thickness dimension D1, wherein the ratio of D1 to H is 0.001-0.005.

[0049] It is understandable that the ratio of the thickness dimension D1 to H of the first structural support layer 200 is not less than 0.001, which can prevent the thickness dimension D1 of the first structural support layer 200 from being too small, affecting the structural strength of the first structural support layer 200 and causing the first structural support layer 200 to lose its function of supporting the pipeline body 100; while the ratio of the thickness dimension D1 to H of the first structural support layer 200 is not greater than 0.005, which can prevent the thickness dimension D1 of the first structural support layer 200 from being too large, affecting the heat exchange between the refrigerant transported in the pipeline body 100 and the battery.

[0050] For example, in the embodiments of this application, 5 micrometers ≤ D1 ≤ 20 micrometers.

[0051] In some embodiments, the first heat insulation layer 300 is a ceramic heat insulation layer, an aerogel heat insulation layer, a glass wool composite heat insulation layer, or an organic heat insulation layer. For example, in the embodiments of this application, the first heat insulation layer 300 is a ceramic heat insulation layer, and the ceramic heat insulation layer is formed by spraying a composite slurry of nano-alumina and boron nitride.

[0052] Because the first insulation layer 300 has poor thermal conductivity, when the battery experiences thermal runaway and emits high-temperature gas, the first insulation layer 300 can isolate most of the heat from the high-temperature gas, reduce the rate of temperature rise of the pipeline body 100 and the refrigerant, and thus prevent the pipeline body 100 from melting and cracking under the impact of the high-temperature gas, resulting in collapse. It can also prevent the heat from the external environment from being transferred to the refrigerant transported inside the pipeline body 100, thereby enabling the refrigerant to continuously exchange heat with the battery.

[0053] Furthermore, since the first heat insulation layer 300 is provided on the outer surface 110 of the pipe body 100, it is equivalent to increasing the thickness of the pipe body 100, which can improve the structural strength and stability of the pipe body 100 to a certain extent.

[0054] In some implementations, see Figure 2 As shown, along the radial direction of the pipe body 100, the pipe body 100 has a thickness dimension H, and the first heat insulation layer 300 has a thickness dimension D2, wherein the ratio of D2 to H is 0.025-0.075.

[0055] Understandably, the ratio of the thickness dimension D2 of the first insulation layer 300 to H is not less than 0.025, which can prevent the thickness dimension D2 of the first insulation layer 300 from being too small, affecting the heat insulation performance of the first insulation layer 300 and causing the first insulation layer 300 to lose its function of protecting the pipeline body 100; while the ratio of the thickness dimension D2 of the first insulation layer 300 to H is not greater than 0.075, which can prevent the thickness dimension D2 of the first insulation layer 300 from being too large, affecting the heat exchange between the refrigerant transported in the pipeline body 100 and the battery.

[0056] For example, in the embodiments of this application, 100 micrometers ≤ D2 ≤ 300 micrometers.

[0057] In some implementations, see Figure 2 As shown, a first heat dissipation hole 310 is provided on the first heat insulation layer 300, wherein the first heat dissipation hole 310 penetrates the first heat insulation layer 300; further, multiple first heat dissipation holes 310 are provided on the first heat insulation layer 300. For example, in the embodiment of this application, multiple first heat dissipation holes 310 are provided at intervals on the first heat insulation layer 300 along the circumferential direction and the radial direction of the first heat insulation layer 300.

[0058] In this embodiment, along the radial direction of the pipe body 100 and along the direction close to the pipe body 100, the diameter of the first heat dissipation hole 310 gradually decreases.

[0059] Understandably, due to the poor thermal conductivity of the first insulation layer 300, the aperture size of the first heat dissipation hole 310 gradually decreases along the radial direction of the pipe body 100 and along the direction close to the pipe body 100. In other words, the smaller the proportion of the first heat dissipation hole 310 in the first insulation layer 300 along the radial direction of the pipe body 100 and along the direction close to the pipe body 100, the better the heat insulation effect of the first insulation layer 300 along the radial direction of the pipe body 100 and along the direction close to the pipe body 100, thus preventing heat from the external environment from being transferred to the pipe body 100 and the refrigerant.

[0060] In some implementations, see Figure 2 As shown, a phase change material is disposed within the first heat dissipation hole 310. The phase change material can be paraffin microcapsules, fatty acid microcapsules, sugar alcohol microcapsules, or low-melting-point alloy microcapsules. Among them, fatty acid microcapsules can be stearic acid microcapsules or palmitic acid microcapsules; sugar alcohol microcapsules can be sorbitol microcapsules or xylitol microcapsules; and low-melting-point alloy microcapsules can be bismuth-tin alloy microcapsules or gallium-indium alloy microcapsules.

[0061] In this embodiment, the phase change material disposed in the first heat dissipation hole 310 is the first paraffin microcapsule 320. The paraffin particles in the first paraffin microcapsule 320 can absorb heat and undergo phase change under high temperature environment. Therefore, when the pipeline body 100 is impacted by high temperature gas, the first paraffin microcapsule 320 can absorb heat from the high temperature gas, thereby preventing heat from being transferred to the pipeline body 100.

[0062] In this embodiment of the application, by providing a first paraffin microcapsule 320 in the first heat dissipation hole 310 of the first heat insulation layer 300, the heat insulation performance of the first heat insulation layer 300 can be better improved, and the protection effect of the first heat insulation layer 300 on the pipeline body 100 can be improved.

[0063] Furthermore, since the first paraffin microcapsule 320 has a certain volume, in this embodiment of the application, the first paraffin microcapsule 320 is embedded in the first heat dissipation hole 310 so that the first paraffin microcapsule 320 can be relatively stably placed on the first heat insulation layer 300, thereby providing better protection for the pipeline body 100.

[0064] It is worth mentioning that, since the first heat insulation layer 300 is located between the first structural support layer 200 and the flame retardant layer 400, the first structural support layer 200 and the flame retardant layer 400 can work together to seal the first heat dissipation hole 310, thereby confining the first paraffin microcapsule 320 within the first heat dissipation hole 310. Even if the first paraffin microcapsule 320 undergoes a phase change, it will not detach from the first heat dissipation hole 310, thus improving the heat insulation performance of the first heat insulation layer 300.

[0065] In some embodiments, at least a portion of the flame retardant layer 400 is an intumescent layer; in the embodiments of this application, the intumescent layer is a silicone resin coating and contains an intumescent flame retardant.

[0066] It is understood that intumescent flame retardants can undergo irreversible volume expansion under high temperature conditions. In this embodiment, when the battery experiences thermal runaway and emits high-temperature gas, the expansion layer can undergo irreversible volume expansion under the impact of the high-temperature gas, thereby forming a dense isolation barrier on the side of the first heat insulation layer 300 away from the pipeline body 100, providing physical isolation, and can better protect the first heat insulation layer 300, the first structural support layer 200 and the pipeline body 100.

[0067] For example, in order to provide more comprehensive protection for the first heat insulation layer 300, the first structural support layer 200 and the pipeline body 100, in this embodiment of the application, the flame retardant layer 400 is an expansion layer as a whole.

[0068] In this embodiment of the application, at least a portion of the flame retardant layer 400 is a thermochromic layer. It is understood that when the flame retardant layer 400 is subjected to the impact of high-temperature gas, when the temperature of the thermochromic layer rises to a certain level, the thermochromic layer will produce an irreversible color change, which can provide a visual warning signal, thereby better reflecting the situation of thermal runaway of the battery and improving the safety of battery use.

[0069] For example, in this embodiment of the application, a thermochromic material is incorporated into the expansion layer, so that the expansion layer can also serve as a thermochromic layer. This allows the flame retardant layer 400 to protect the first heat insulation layer 300, the first structural support layer 200, and the pipeline body 100 through volume expansion, while also providing a visual warning signal through color changes.

[0070] In some implementations, see Figure 2 As shown, along the radial direction of the pipe body 100, the pipe body 100 has a thickness dimension H, and the flame retardant layer 400 has a thickness dimension D3, wherein the ratio of D3 to H is 0.0125-0.0375.

[0071] Understandably, the ratio of the thickness dimension D3 of the flame-retardant layer 400 to H is not less than 0.0125. This can prevent the thickness dimension D3 of the flame-retardant layer 400 from being too small, which would affect the protective performance of the physical isolation of the flame-retardant layer 400 and cause the flame-retardant layer 400 to lose its function of protecting the pipeline body 100. On the other hand, the ratio of the thickness dimension D3 of the flame-retardant layer 400 to H is not greater than 0.0375. This can prevent the thickness dimension D3 of the flame-retardant layer 400 from being too large, which would affect the heat exchange between the refrigerant transported in the pipeline body 100 and the battery.

[0072] For example, in the embodiments of this application, 50 micrometers ≤ D3 ≤ 150 micrometers.

[0073] In some embodiments, the number of the first structural support layer 200 and the first heat insulation layer 300 disposed on the outer surface 110 of the pipeline body 100 can be one or more, and the one or more first structural support layers 200 and the one or more first heat insulation layers 300 are located between the outer surface 110 and the flame retardant layer 400.

[0074] It is understandable that, since the flame retardant layer 400 will undergo volume changes under the impact of high-temperature gas, the flame retardant layer 400 can only be set on the side of the first structural support layer 200 and the first heat insulation layer 300 away from the pipeline body 100, so as to avoid the volume change of the flame retardant layer 400 from damaging the structure of the first structural support layer 200 and the first heat insulation layer 300.

[0075] In some implementations, see Figure 1 and Figure 2 As shown, in the radial direction of the pipe body 100, the pipe body 100 has an inner surface 120.

[0076] Furthermore, in the embodiments of this application, see... Figure 2 As shown, a second structural support layer 500 is provided on one side of the inner surface 120 of the pipeline body 100. The second structural support layer 500 can provide support for the pipeline body 100 to improve the structural strength of the pipeline body 100 and prevent the pipeline body 100 from collapsing under the influence of the external environment. In particular, in the case of thermal runaway of the battery and the emission of high-temperature gas, the pipeline body 100 can be prevented from collapsing under the impact of high-temperature gas.

[0077] It is worth mentioning that the first structural support layer 200 can support the pipe body 100 on the outer surface 110 side, while the second structural support layer 500 can support the pipe body 100 on the inner surface 120 side. The first structural support layer 200 and the second structural support layer 500 work together to improve the structural stability of the pipe body 100 and prevent the pipe body 100 from collapsing under the impact of high temperature gas.

[0078] Furthermore, in the embodiments of this application, see... Figure 2As shown, a second heat insulation layer 600 is provided on one side of the inner surface 120 of the pipeline body 100. The second heat insulation layer 600 can isolate the temperature of the external environment of the pipeline body 100, thereby preventing the pipeline body 100 from being affected by the external environment. Especially in the case of thermal runaway of the battery and emission of high temperature gas, it can prevent the pipeline body 100 from melting and cracking under the impact of high temperature gas, resulting in collapse. It can also prevent the heat of the external environment from being transferred to the refrigerant transported inside the pipeline body 100, thereby enabling the refrigerant to continuously exchange heat with the battery.

[0079] It is worth mentioning that the first insulation layer 300 provides insulation for the pipe body 100 on the outer surface 110 side, while the second insulation layer 600 provides insulation for the pipe body 100 on the inner surface 120 side. The combination of the first insulation layer 300 and the second insulation layer 600 effectively improves the insulation effect, preventing heat from the external environment from being transferred to the refrigerant transported inside the pipe body 100, thus allowing the refrigerant to continuously exchange heat with the battery. Furthermore, the second insulation layer 600 itself possesses a certain structural strength, enabling it to support the pipe body 100 and further enhancing its structural strength.

[0080] It should be noted that, in some embodiments, at least one of a second structural support layer 500 and a second heat insulation layer 600 may be provided on the inner surface 120 of the pipe body 100, both of which can provide protection for the pipe body 100. In some embodiments, the second structural support layer 500 and the second heat insulation layer 600 may be provided simultaneously on the inner surface 120 of the pipe body 100, with the second structural support layer 500 directly disposed on the inner surface 120 and the second heat insulation layer 600 disposed on the side of the second structural support layer 500 facing away from the inner surface 120.

[0081] In the embodiments of this application, see Figure 2 As shown, a second structural support layer 500 and a second heat insulation layer 600 are simultaneously disposed on the inner surface 120 of the pipeline body 100. The second structural support layer 500 is directly disposed on the inner surface 120, and the second heat insulation layer 600 is disposed on the side of the second structural support layer 500 facing away from the inner surface 120. Through the synergistic protection of the second structural support layer 500 and the second heat insulation layer 600, the stability of the pipeline body 100 can be significantly improved. Especially in the event of thermal runaway of the battery and emission of high-temperature gas, the second structural support layer 500 can improve the structural strength of the pipeline body 100, preventing the pipeline body 100 from collapsing, and the second heat insulation layer 600 can prevent heat transfer to the refrigerant, allowing the refrigerant to continuously exchange heat with the battery.

[0082] In some embodiments, the number of the second structural support layer 500 and the second heat insulation layer 600 disposed on the inner surface 120 of the pipe body 100 can be one or more.

[0083] In some embodiments, the second structural support layer 500 is a ceramic-based material layer, a metal-based composite layer, or an inorganic non-metallic layer; wherein, the ceramic-based material layer can be an oxide ceramic layer, a silicon nitride ceramic layer, or a silicon carbide ceramic layer; the metal-based composite layer can be an aluminum-based ceramic composite coating or a titanium-based high-temperature resistant coating; and the inorganic non-metallic layer can be a mullite coating.

[0084] In this embodiment, the first structural support layer 200 is a ceramic-based material layer. Since the ceramic-based material layer can withstand a high temperature of 800 degrees Celsius, the second structural support layer 500 can maintain better structural stability in a high-temperature environment.

[0085] When the second structural support layer 500 is placed on the inner surface 120 of the pipeline body 100, when the battery experiences thermal runaway and emits high-temperature gas, the second structural support layer 500 can stably support the pipeline body 100, thereby preventing the pipeline body 100 from collapsing.

[0086] In some embodiments, the second heat insulation layer 600 is a ceramic heat insulation layer, an aerogel heat insulation layer, a glass wool composite heat insulation layer, or an organic heat insulation layer. For example, in the embodiments of this application, the second heat insulation layer 600 is a ceramic heat insulation layer, and the ceramic heat insulation layer is formed by spraying a composite slurry of nano-alumina and boron nitride.

[0087] Because the second insulation layer 600 has poor thermal conductivity, when the battery experiences thermal runaway and emits high-temperature gas, the second insulation layer 600 can isolate most of the heat from the high-temperature gas, reduce the rate of temperature rise of the refrigerant, and thus prevent heat from the external environment from being transferred to the refrigerant transported inside the pipeline body 100, thereby enabling the refrigerant to continuously exchange heat with the battery.

[0088] Furthermore, since a second heat insulation layer 600 is provided on the inner surface 120 of the pipe body 100, it is equivalent to increasing the thickness of the pipe body 100, which can improve the structural strength and stability of the pipe body 100 to a certain extent.

[0089] In some implementations, see Figure 2As shown, a second heat dissipation hole 610 is provided on the second heat insulation layer 600, wherein the second heat dissipation hole 610 penetrates the second heat insulation layer 600; further, multiple second heat dissipation holes 610 are provided on the second heat insulation layer 600. For example, in the embodiment of this application, multiple second heat dissipation holes 610 are provided at intervals on the second heat insulation layer 600 along the circumferential direction and the radial direction of the second heat insulation layer 600.

[0090] In this embodiment, along the radial direction of the pipe body 100 and along the axis A near the pipe body 100, the diameter of the second heat dissipation hole 610 gradually decreases.

[0091] Understandably, due to the poor thermal conductivity of the second insulation layer 600, the aperture size of the second heat dissipation hole 610 gradually decreases along the radial direction of the pipe body 100 and along the axis A near the pipe body 100. In other words, the smaller the proportion of the second heat dissipation hole 610 in the second insulation layer 600 along the radial direction of the pipe body 100 and along the axis A near the pipe body 100, the better the heat insulation effect of the second insulation layer 600 along the radial direction of the pipe body 100 and along the axis A near the pipe body 100, thus preventing heat from the external environment from being transferred to the refrigerant.

[0092] In some implementations, see Figure 2 As shown, a phase change material is disposed within the second heat dissipation hole 610. The phase change material can be paraffin microcapsules, fatty acid microcapsules, sugar alcohol microcapsules, or low-melting-point alloy microcapsules. Among them, fatty acid microcapsules can be stearic acid microcapsules or palmitic acid microcapsules; sugar alcohol microcapsules can be sorbitol microcapsules or xylitol microcapsules; and low-melting-point alloy microcapsules can be bismuth-tin alloy microcapsules or gallium-indium alloy microcapsules.

[0093] In this embodiment, the phase change material disposed in the second heat dissipation hole 610 is the second paraffin microcapsule 620. The paraffin particles in the second paraffin microcapsule 620 can absorb heat and generate a phase change under high temperature environment. Therefore, when the pipeline body 100 is impacted by high temperature gas, the second paraffin microcapsule 620 can absorb the heat from the high temperature gas, thereby preventing the heat from being transferred to the refrigerant.

[0094] In this embodiment of the application, by providing a second paraffin microcapsule 620 in the second heat dissipation hole 610 of the second heat insulation layer 600, the heat insulation performance of the second heat insulation layer 600 can be better improved.

[0095] Furthermore, since the second paraffin microcapsule 620 has a certain volume, in this embodiment of the application, the second paraffin microcapsule 620 is embedded in the second heat dissipation hole 610 so that the second paraffin microcapsule 620 can be relatively stably positioned on the second heat insulation layer 600.

[0096] It is worth mentioning that, since the second paraffin microcapsule 620 is embedded in the second heat dissipation hole 610, and the opening of the second heat dissipation hole 610 at the end away from the inner surface 120 is smaller, in this embodiment of the application, see... Figure 2 As shown, the radial dimension of the opening at the end of the second heat dissipation hole 610 away from the inner surface 120 is smaller than the minimum radial dimension of the second paraffin microcapsule 620, so that the second heat dissipation hole 610 can limit the second paraffin microcapsule 620, preventing the second paraffin microcapsule 620 from detaching from the second heat insulation layer 600 through the second heat dissipation hole 610, and improving the stability of the second paraffin microcapsule 620 embedded in the second heat dissipation hole 610.

[0097] Secondly, this application provides a battery management system that includes the aforementioned battery liquid cooling pipeline, thus possessing the corresponding technical effects and advantages.

[0098] In the embodiments of this application, see Figure 1 As shown, the battery management system also includes monitoring equipment, which is used to monitor the flame retardant layer 400 in the battery liquid cooling pipeline in real time.

[0099] For example, the monitoring device is used to monitor the volume change of the flame-retardant layer 400 in real time. Since the flame-retardant layer 400 can expand in volume under high temperature conditions in this embodiment, when the monitoring device detects a volume change in the flame-retardant layer 400, the monitoring device can feed back the volume change information of the flame-retardant layer 400 to the battery management system, thereby enabling the battery management system to promptly detect the occurrence of thermal runaway in the battery, thus improving the safety of battery use in this embodiment.

[0100] For example, the monitoring device is used to monitor the color change of the flame retardant layer 400 in real time. Since the flame retardant layer 400 can change color under high temperature environment in this embodiment, when the monitoring device detects a color change in the flame retardant layer 400, the monitoring device can feed back the color change information of the flame retardant layer 400 to the battery management system, thereby enabling the battery management system to promptly detect the occurrence of thermal runaway in the battery, thereby improving the safety of battery use in this embodiment.

[0101] It is understood that, in the embodiments of this application, the monitoring device may include, but is not limited to, image monitoring devices, photoelectric sensors, or distance sensors.

[0102] For example, when the monitoring device includes an image monitoring device, such as a camera, the volume change of the flame-retardant layer 400 can be monitored in real time. Since different colors of the flame-retardant layer 400 have different refractive indices for light, when the monitoring device includes a photoelectric sensor, the color change of the flame-retardant layer 400 can be monitored in real time.

[0103] Thirdly, the embodiments of this application provide a power battery, which includes the above-mentioned battery liquid cooling pipeline or the above-mentioned battery management system, and therefore can have the corresponding technical effects and advantages.

[0104] Finally, it should be noted that other embodiments of this utility model will readily conceive of by those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of this utility model that follow the general principles of this utility model and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A battery liquid cooling pipeline, characterized in that: include, Pipe body (100) for conveying refrigerant; the pipe body (100) has an outer surface (110) in the radial direction. A first structural support layer (200) is formed on the outer surface (110); A first thermal insulation layer (300) is formed on the side of the first structural support layer (200) facing away from the pipe body (100); A flame-retardant layer (400) is formed on the side of the first insulation layer (300) away from the pipe body (100).

2. The battery liquid cooling pipeline according to claim 1, characterized in that: The first structural support layer (200) is a ceramic-based material layer, a metal-based composite layer, or an inorganic non-metallic layer.

3. The battery liquid cooling pipeline according to claim 1 or 2, characterized in that: Along the radial direction of the pipe body (100), the pipe body (100) has a thickness dimension H, and the first structural support layer (200) has a thickness dimension D1, wherein the ratio of D1 to H is 0.001-0.

005.

4. The battery liquid cooling pipeline according to claim 1, characterized in that: The first insulation layer (300) is a ceramic insulation layer, an aerogel insulation layer, a glass wool composite insulation layer, or an organic insulation layer.

5. The battery liquid cooling pipeline according to claim 1 or 4, characterized in that: Along the radial direction of the pipe body (100), the pipe body (100) has a thickness dimension H, and the first heat insulation layer (300) has a thickness dimension D2, wherein the ratio of D2 to H is 0.025-0.

075.

6. The battery liquid cooling pipeline according to claim 1 or 4, characterized in that: The first heat insulation layer (300) is provided with one or more heat dissipation holes; along the radial direction of the pipe body (100) and along the direction close to the pipe body (100), the diameter of the heat dissipation holes gradually decreases.

7. The battery liquid cooling pipeline according to claim 6, characterized in that: The heat dissipation holes are embedded with phase change material.

8. The battery liquid cooling pipeline according to any one of claims 1, 2, 4, and 7, characterized in that: At least a portion of the flame-retardant layer (400) is an intumescent layer and / or a thermochromic layer.

9. The battery liquid cooling pipeline according to claim 8, characterized in that: Along the radial direction of the pipe body (100), the pipe body (100) has a thickness dimension H, and the flame retardant layer (400) has a thickness dimension D3, wherein the ratio of D3 to H is 0.0125-0.0375.

10. A battery management system, characterized in that: include, Monitoring equipment; Battery liquid cooling pipeline as described in any one of claims 1-9; The monitoring device is used to monitor in real time at least one of the volume and color of the flame-retardant layer (400) of the battery liquid cooling pipeline.

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