Sodium electric commercial energy storage cabinet based on phase change gravity heat pipe

Abstract

The application belongs to the technical field of system thermal management, and discloses a sodium electric industrial and commercial energy storage cabinet based on a phase-change gravity heat pipe. The cabinet comprises a cabinet body, a supporting mechanism, a battery pack and a cooling mechanism. The cabinet body comprises a battery cabin, the supporting mechanism is arranged in the battery cabin, a plurality of battery packs are placed along the Z axis on the supporting mechanism, the cooling mechanism comprises a plurality of cooling components and a plurality of heat dissipation fins, each battery pack is provided with at least one cooling component, the cooling component comprises an evaporation chamber and a plurality of phase-change gravity heat pipes, the phase-change working medium is arranged in the evaporation chamber, the two ends of the phase-change gravity heat pipe are communicated with the evaporation chamber, the phase-change gravity heat pipe extends to one side of the supporting mechanism along the X axis to the left or right, the phase-change gravity heat pipe has a first pipe section and a second pipe section with a height difference along the Z axis, and the outer wall of the plurality of phase-change gravity heat pipes on the same side of the supporting mechanism is sleeved with at least one heat dissipation fin. The cooling mechanism has a simple structure, does not need a complex cooling liquid conveying pipeline, and improves the safety of the industrial and commercial energy storage cabinet.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of system thermal management, and particularly relates to a sodium industrial and commercial energy storage cabinet based on a phase change gravity heat pipe. BACKGROUND

[0002] The industrial and commercial energy storage cabinet is a modular energy storage system specially designed for industrial and commercial scenes, mainly used for storage, management and optimized use of electric energy, which integrates battery packs, battery management systems (BMS), energy management systems (EMS) and the like in a standardized cabinet, and has the characteristics of flexible deployment, high energy efficiency and safety and reliability. The normal work of the battery pack needs to be carried out within a certain temperature range, and high temperature will affect its working performance and reduce its cycle life. If effective cooling measures are not taken, it will cause thermal runaway and cause serious harm.

[0003] In the related art, the industrial and commercial energy storage cabinet mainly adopts air cooling and liquid cooling. The air cooling forms a directional air flow by installing a fan on the top or side of the cabinet body to dissipate heat, but the heat dissipation efficiency is low and the temperature uniformity is poor. The liquid cooling circulates the cooling liquid in the pipeline between the battery packs to directly or indirectly contact the battery modules for heat exchange, but the cost is high and there is a risk of liquid leakage, which needs regular maintenance.

[0004] Therefore, it is necessary to provide a sodium industrial and commercial energy storage cabinet based on a phase change gravity heat pipe to solve the above problems. SUMMARY

[0005] The present application aims to provide a sodium industrial and commercial energy storage cabinet based on a phase change gravity heat pipe, which utilizes the vapor-liquid conversion of the phase change working medium to achieve heat dissipation of the industrial and commercial energy storage cabinet, has good heat dissipation effect, simple structure and low safety hazards.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] A sodium industrial and commercial energy storage cabinet based on a phase change gravity heat pipe, comprising:

[0008] A cabinet body comprising a battery compartment, and a support mechanism arranged in the battery compartment;

[0009] A plurality of battery packs are arranged on the support mechanism along the Z-axis;

[0010] The cooling mechanism comprises a plurality of cooling assemblies and a plurality of heat dissipation fins, each of the battery packs is provided with at least one cooling assembly, the cooling assembly comprises an evaporation chamber and a plurality of phase-change gravity heat pipes, the phase-change working medium is contained in the evaporation chamber, the two ends of the phase-change gravity heat pipe are communicated with the evaporation chamber, and the phase-change gravity heat pipe extends to one side of the support mechanism along the X axis to the left or to the right, the phase-change gravity heat pipe has a first pipe section and a second pipe section with a height difference along the Z axis, and the outer wall of the plurality of phase-change gravity heat pipes located on the same side of the support mechanism is at least sleeved with one heat dissipation fin.

[0011] As preferred, the plurality of phase-change gravity heat pipes are divided into two groups of phase-change gravity heat pipe groups, the two groups of phase-change gravity heat pipe groups are distributed along the X axis, the plurality of phase-change gravity heat pipes located on the left side of the X axis extend to one side of the support mechanism along the X axis to the left, and the plurality of phase-change gravity heat pipes located on the right side of the X axis extend to one side of the support mechanism along the X axis to the right.

[0012] As preferred, the phase-change gravity heat pipe further comprises a third pipe section, a fourth pipe section and a fifth pipe section, the third pipe section and the fourth pipe section both extend along the Z axis, the lengths of the third pipe section and the fourth pipe section are different, one end of the third pipe section is communicated with the evaporation chamber, the other end of the third pipe section is communicated with one end of the first pipe section, the other end of the first pipe section is provided with a first bidirectional stop valve, one end of the fourth pipe section is communicated with the evaporation chamber, the other end of the fourth pipe section is communicated with one end of the second pipe section, the other end of the second pipe section is provided with a second bidirectional stop valve, the fifth pipe section has a U-shaped structure, a plurality of heat dissipation fins are sleeved on the outer wall of the fifth pipe section, and the two ends of the fifth pipe section are respectively connected to the first bidirectional stop valve and the second bidirectional stop valve, so that the phase-change gravity heat pipe is communicated into a loop.

[0013] As preferred, a plurality of fans are arranged on one side of the cabinet along the Y axis, the plurality of fans are all opposite to the plurality of heat dissipation fins, and a louver is arranged on the other side of the cabinet along the Y axis, and the louver is used for ventilation.

[0014] As preferred, the inner wall and / or the outer wall of the cabinet is provided with a first heat insulation member.

[0015] As preferred, the support mechanism comprises:

[0016] Two bracket assemblies are arranged along the X axis, the bracket assembly has an avoiding space penetratingly arranged along the X axis, and the phase-change gravity heat pipe can extend to one side of the support mechanism through the avoiding space.

[0017] A plurality of supporting assemblies are distributed along the Z axis, the two ends of the supporting assembly are respectively connected to two bracket assemblies, and the battery pack is placed on the supporting assembly.

[0018] As preferred, the battery pack further comprises:

[0019] a box body having a receiving cavity, a top end of the box body having an opening;

[0020] a battery module fixedly received in the receiving cavity, the cooling assembly sealing cover being arranged at the opening and abutting against the battery module.

[0021] As preferred, a heat conducting member is arranged between the cooling assembly and the battery module.

[0022] As preferred, the battery module comprises:

[0023] a cell group comprising a plurality of cells, the plurality of cells being stacked along a Y axis, and a second heat insulation member being arranged between two adjacent cells;

[0024] a fixing assembly comprising two end plates and a plurality of connecting members, the two end plates being arranged at two sides of the cell group along the Y axis, and two ends of the connecting members being fixed to the two end plates, so that the fixing assembly clamps and fixes the cell group.

[0025] As preferred, a positive plate and a negative plate are arranged at two ends of the cell along an X axis, respectively, and the positive plate and the negative plate of two adjacent cells are arranged in opposite directions, and the battery module further comprises an aluminum bar assembly, two aluminum bar assemblies being arranged at two ends of the cell group along the X axis, the aluminum bar assembly comprising:

[0026] a plurality of aluminum bars, the aluminum bars being connected to the positive plate and the negative plate of two adjacent cells;

[0027] a first insulation member, the first insulation member being arranged between two adjacent aluminum bars.

[0028] The present application has the following advantages:

[0029] The sodium battery commercial energy storage cabinet based on the phase change gravity heat pipe comprises a cabinet body, a supporting mechanism, a battery pack and a cooling mechanism, the cabinet body comprises a battery cabin, the supporting mechanism is arranged in the battery cabin, a plurality of battery packs are arranged on the supporting mechanism along a Z axis, the cooling mechanism comprises a plurality of cooling assemblies and a plurality of heat dissipation fins, each battery pack is provided with at least one cooling assembly, the cooling assembly comprises an evaporation chamber and a plurality of phase change gravity heat pipes, the evaporation chamber contains phase change working medium, two ends of the phase change gravity heat pipe are communicated with the evaporation chamber, and the phase change gravity heat pipe extends to one side of the supporting mechanism along an X axis to the left or to the right, the phase change gravity heat pipe has a first pipe section and a second pipe section with a height difference along the Z axis, and at least one heat dissipation fin is arranged on the outer wall of the plurality of phase change gravity heat pipes on the same side of the supporting mechanism.

[0030] The sodium electric commercial energy storage cabinet generates heat when working, at least one cooling component is arranged in each battery pack, the heat generated by the battery pack is conducted to the evaporation chamber of the cooling component, the phase change working medium in the evaporation chamber absorbs the heat generated by the battery pack, part of the heat is used to sublimate the phase change working medium from a liquid state to a gas state, and the other part of the heat is used to increase the temperature of the phase change working medium in the gas state, the phase change working medium in the gas state flows upward into the phase change gravity heat pipe and flows in the phase change gravity heat pipe under the push of the pressure difference, the phase change working medium in the gas state flows to the first pipe section, and then continues to flow to the position of the phase change gravity heat pipe sleeved with the heat dissipation fins, the phase change working medium in the gas state transmits heat to the phase change gravity heat pipe, the phase change gravity heat pipe transmits heat to the heat dissipation fins sleeved on the outer wall, since the heat dissipation fins have a large heat dissipation area, the heat dissipation fins can effectively and quickly perform convective heat exchange with the surrounding air to dissipate heat to the surrounding environment, so that the phase change working medium is cooled and re-liquefied, the liquefied phase change working medium flows back to the second pipe section under the action of gravity, and then continues to flow into the evaporation chamber to continue to participate in the next heat absorption, heat transmission and heat dissipation process, forming a circulating heat dissipation system and continuously dissipating heat of the battery pack.

[0031] Compared with the related air cooling system and liquid cooling system, the cooling mechanism in the application utilizes the vaporization and liquefaction process of the phase change working medium to transfer heat, the phase change process of the phase change working medium can absorb a large amount of heat, quickly take away the heat generated by the battery pack, effectively reduce the temperature of the battery pack, and can uniformly absorb the heat of the battery pack to avoid local overheating; through the combination of the phase change gravity heat pipe and the heat dissipation fins, the heat dissipation stability is better, the heat dissipation efficiency is higher, and the vaporized phase change working medium can be quickly liquefied and fall into the evaporation chamber to re-perform the next round of heat dissipation on the battery pack. The cooling mechanism realizes heat dissipation of the battery pack through the combination of the evaporation chamber, the phase change gravity heat pipe and the heat dissipation fins, has a simple structure, does not need a complex cooling liquid conveying pipeline, reduces the safety hidden danger caused by pipeline burst and the like, improves the safety and service life of the battery pack, and further improves the safety and service life of the sodium electric commercial energy storage cabinet. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structure schematic view of a wall of the sodium electric commercial energy storage cabinet based on the phase change gravity heat pipe provided by the application;

[0033] Figure 2 is a structure schematic view of the battery pack and the cooling mechanism;

[0034] Figure 3 is Figure 2 is a local enlarged view of A in

[0035] Figure 4is a structural schematic view of a battery pack and a partial cooling assembly provided by the present application;

[0036] Figure 5 is a structural schematic view of a cabinet body and a supporting mechanism provided by the present application;

[0037] Figure 6 is a partial structural schematic view of a battery pack provided by the present application;

[0038] Figure 7 is a schematic view of a battery cell group and a fixing assembly provided by the present application;

[0039] Figure 8 is a structural schematic view of a second insulation member provided by the present application;

[0040] Figure 9 is a structural schematic view of a battery cell provided by the present application;

[0041] Figure 10 is a structural schematic view of a battery module provided by the present application;

[0042] Figure 11 is a structural schematic view of an aluminum bar assembly provided by the present application.

[0043] In the figure:

[0044] 1, cabinet body; 11, battery cabin;

[0045] 2, supporting mechanism; 21, bracket assembly; 211, bracket body; 22, supporting assembly; 221, supporting member;

[0046] 3, battery pack; 31, box body; 311, accommodating cavity; 32, battery module; 321, battery cell group; 3211, battery cell; 32111, positive plate; 32112, negative plate; 3212, second heat insulation member; 3213, second insulation member; 322, fixing assembly; 3221, end plate; 3222, connecting member; 323, aluminum bar assembly; 3231, aluminum bar; 3232, first insulation member; 324, copper bar; 33, mounting plate;

[0047] 4, cooling mechanism; 41, cooling assembly; 411, evaporation chamber; 412, phase-change gravity heat pipe; 4121, first pipe segment; 4122, second pipe segment; 4123, third pipe segment; 4124, fourth pipe segment; 4125, fifth pipe segment; 42, heat dissipation fin. DETAILED DESCRIPTION

[0048] The application will be further described below in conjunction with the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not to be used to limit the scope of the application. In addition, it is to be understood that, for ease of description, only the parts related to the application are shown in the drawings.

[0049] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0050] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0051] In the description of the present embodiment, the terms "upper", "lower", "right", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0052] As Figures 1-11As shown, the embodiment provides a sodium electric commercial energy storage cabinet based on phase change gravity heat pipe, which comprises a cabinet body 1, a supporting mechanism 2, a battery pack 3 and a cooling mechanism 4. The cabinet body 1 comprises a battery cabin 11, the supporting mechanism 2 is arranged in the battery cabin 11, a plurality of battery packs 3 are placed on the supporting mechanism 2 along the Z axis, and the cooling mechanism 4 comprises a plurality of cooling components 41 and a plurality of heat dissipation fins 42. Each battery pack 3 is provided with at least one cooling component 41, the cooling component 41 comprises an evaporation chamber 411 and a plurality of phase change gravity heat pipes 412, the evaporation chamber 411 contains phase change working medium, the two ends of the phase change gravity heat pipe 412 are communicated with the evaporation chamber 411, and the phase change gravity heat pipe 412 extends to one side of the supporting mechanism 2 along the X axis to the left or to the right. The phase change gravity heat pipe 412 has a first pipe segment 4121 and a second pipe segment 4122 with a height difference along the Z axis, and at least one heat dissipation fin 42 is arranged on the outer wall of the phase change gravity heat pipe 412 located on the same side of the supporting mechanism 2.

[0053] The cabinet body 1 provides mechanical support and structural framework for the entire sodium electric commercial energy storage cabinet. The cabinet body 1 comprises the battery cabin 11 for accommodating the battery pack 3 and the cooling mechanism 4. The supporting mechanism 2 is located inside the battery cabin 11 and directly bears and fixes a plurality of battery packs 3 stacked along the Z axis, ensuring that the plurality of battery packs 3 are stably and orderly stacked in the battery cabin 11. The battery pack 3 is the core unit of the sodium electric commercial energy storage cabinet and can store and release electric energy. It should be noted that the cabinet body 1 also comprises an electrical cabin for installing high-voltage boxes, PCS and other electrical equipment. The structure and arrangement of the electrical cabin refer to the sodium electric commercial energy storage cabinet in the prior art, and the embodiment is not limited in this regard.

[0054] For convenience of description, in the embodiment, the first pipe segment 4121 of the phase change gravity heat pipe 412 is defined as higher on the Z axis, and the second pipe segment 4122 of the phase change gravity heat pipe 412 is defined as lower on the Z axis.

[0055] The sodium electric commercial energy storage cabinet in the embodiment generates heat when working. Each battery pack 3 is provided with at least one cooling assembly 41. The heat generated by the battery pack 3 is conducted to the evaporation chamber 411 of the cooling assembly 41. The phase-change working medium in the evaporation chamber 411 absorbs the heat generated by the battery pack 3. Part of the heat is used to sublimate the phase-change working medium from a liquid state to a gaseous state. Another part of the heat is used to increase the temperature of the gaseous phase-change working medium. The gaseous phase-change working medium flows upward into the phase-change gravity heat pipe 412 and flows in the phase-change gravity heat pipe 412 under the push of the pressure difference. The gaseous phase-change working medium flows to the first pipe section 4121 and then continues to flow to the position of the phase-change gravity heat pipe 412 sleeved with the heat dissipation fins 42. The gaseous phase-change working medium transfers heat to the phase-change gravity heat pipe 412. The phase-change gravity heat pipe 412 transfers heat to the heat dissipation fins 42 sleeved on the outer wall. Since the heat dissipation fins 42 have a large heat dissipation area, the heat dissipation fins 42 can effectively and quickly perform convective heat exchange with the surrounding air to dissipate heat to the surrounding environment, so that the phase-change working medium is cooled and re-liquefied. The liquefied phase-change working medium flows back to the second pipe section 4122 under the action of gravity and then continues to flow into the evaporation chamber 411 to continue to participate in the next heat absorption, heat transfer and heat dissipation process, forming a circulating heat dissipation system and continuously dissipating heat for the battery pack 3.

[0056] Compared with the related air-cooled system and liquid-cooled system, the cooling mechanism 4 in the embodiment uses the evaporation and liquefaction process of the phase-change working medium to transfer heat. The phase-change process of the phase-change working medium can absorb a large amount of heat, quickly take away the heat generated by the battery pack 3, effectively reduce the temperature of the battery pack 3, and uniformly absorb the heat of the battery pack 3 to avoid local overheating. Through the combination of the phase-change gravity heat pipe 412 and the heat dissipation fins 42, the heat dissipation stability is better, the heat dissipation efficiency is higher, the vaporized phase-change working medium can be quickly liquefied and fall into the evaporation chamber 411, and the next round of heat dissipation for the battery pack 3 is performed. The cooling mechanism 4 realizes heat dissipation for the battery pack 3 through the combination of the evaporation chamber 411, the phase-change gravity heat pipe 412 and the heat dissipation fins 42. The structure is simple, and a complex cooling liquid conveying pipeline is not needed. The safety hidden danger caused by pipeline burst and other faults is reduced, the safety and service life of the battery pack 3 are improved, and then the safety and service life of the sodium electric commercial energy storage cabinet are improved.

[0057] It should be noted that the number of cooling mechanisms 4 provided on each battery pack 3 is not limited. As long as the area of the evaporation chamber 411 of the several cooling mechanisms 4 can cover the battery modules 32 placed in the battery pack 3, the battery modules 32 in the battery pack 3 can be ensured to be timely transferred to the evaporation chamber 411 of the cooling mechanism 4 when generating heat. Figure 4As shown, in the present embodiment, one cooling mechanism 4 is arranged on each battery pack 3, and the area of the evaporation chamber 411 of the cooling mechanism 4 is the same as the surface area of the top end face of the battery module 32.

[0058] In an alternative embodiment, the plurality of phase-change gravity heat pipes 412 on the plurality of battery packs 3 extend leftward along the X axis to the left side of the support mechanism 2, and the outer walls of the plurality of phase-change gravity heat pipes 412 are at least sleeved with one heat dissipation fin 42, and at this time, the heat dissipation fins 42 are arranged only on the left side of the support mechanism 2.

[0059] In another alternative embodiment, the plurality of phase-change gravity heat pipes 412 on the plurality of battery packs 3 extend rightward along the X axis to the right side of the support mechanism 2, and the outer walls of the plurality of phase-change gravity heat pipes 412 are at least sleeved with one heat dissipation fin 42, and at this time, the heat dissipation fins 42 are arranged only on the right side of the support mechanism 2.

[0060] In yet another alternative embodiment, the plurality of phase-change gravity heat pipes 412 on part of the battery packs 3 extend leftward along the X axis to the left side of the support mechanism 2, and the plurality of phase-change gravity heat pipes 412 on another part of the battery packs 3 extend rightward along the X axis to the right side of the support mechanism 2, and the outer walls of the plurality of phase-change gravity heat pipes 412 on the left side are at least sleeved with one heat dissipation fin 42, and the outer walls of the plurality of phase-change gravity heat pipes 412 on the right side are at least sleeved with one heat dissipation fin 42.

[0061] In the present embodiment, as shown, Figures 2-4 the plurality of phase-change gravity heat pipes 412 are divided into two groups of phase-change gravity heat pipes, and the two groups of phase-change gravity heat pipes are distributed along the X axis with a spacing, the plurality of phase-change gravity heat pipes 412 on the left side of the X axis extend leftward along the X axis to one side of the support mechanism 2, and the plurality of phase-change gravity heat pipes 412 on the right side of the X axis extend rightward along the X axis to one side of the support mechanism 2. By dividing the plurality of phase-change gravity heat pipes 412 into two groups of phase-change gravity heat pipes and extending the two groups of phase-change gravity heat pipes to the two sides of the support mechanism 2, respectively, the space on the two sides of the support mechanism 2 is fully utilized, and the space shortage and possible mutual interference caused by crowding all the phase-change gravity heat pipes 412 on one side are avoided, and it is also conducive to forming a smoother airflow channel around the phase-change gravity heat pipes 412, avoiding airflow channel obstruction caused by dense arrangement, and improving the heat dissipation efficiency.

[0062] Furthermore, as shown, Figure 4 the plurality of phase-change gravity heat pipes 412 in the same group of phase-change gravity heat pipes are arranged along the Y axis with a spacing. The two groups of phase-change gravity heat pipes are distributed along the X axis with a spacing, and the plurality of phase-change gravity heat pipes 412 in each group of phase-change gravity heat pipes are arranged along the Y axis with a spacing, so that the plurality of phase-change gravity heat pipes 412 can be more uniformly arranged on the evaporation chamber 411, and it is ensured that the cooling mechanism 4 can uniformly lead out the heat of the battery pack 3, and avoid local temperature unevenness.

[0063] In some embodiments, a heat dissipation fin 42 is provided on one side of the support mechanism 2.

[0064] In other embodiments, such as Figure 2 As shown, multiple heat dissipation fins 42 are simultaneously provided on one side of the support mechanism 2, and the multiple heat dissipation fins 42 are distributed at intervals along the X-axis. The multiple heat dissipation fins 42 dissipate heat together, increasing the contact area with the air, so that the heat can be more fully transferred to the surrounding air through convection. The intervals between the multiple heat dissipation fins 42 provide airflow channels. When the air flows through the heat dissipation fins 42, the existence of the intervals allows the air to flow more smoothly between the heat dissipation fins 42, forming a good convection environment.

[0065] Optionally, such as Figures 2-4 As shown, the phase change gravity heat pipe 412 also includes a third pipe section 4123, a fourth pipe section 4124, and a fifth pipe section 4125. The third pipe section 4123 and the fourth pipe section 4124 both extend along the Z-axis, and their lengths are different. One end of the third pipe section 4123 is connected to the evaporation chamber 411, and the other end of the third pipe section 4123 is connected to one end of the first pipe section 4121. The other end of the first pipe section 4121 has a first bidirectional cutoff. The valve, one end of the fourth pipe section 4124 is connected to the evaporation chamber 411, the other end of the fourth pipe section 4124 is connected to one end of the second pipe section 4122, the other end of the second pipe section 4122 has a second bidirectional shut-off valve, the fifth pipe section 4125 has a U-shaped structure, a number of heat dissipation fins 42 are sleeved on the outer wall of the fifth pipe section 4125, and the two ends of the fifth pipe section 4125 are respectively connected to the first bidirectional shut-off valve and the second bidirectional shut-off valve, so that the phase change gravity heat pipe 412 is connected to form a loop.

[0066] The third pipe segment 4123 and the fourth pipe segment 4124 are arranged along the Z axis and have different lengths, so that the first pipe segment 4121 and the second pipe segment 4122 can communicate with the evaporation chamber 411 through the third pipe segment 4123 and the fourth pipe segment 4124 respectively, and the first pipe segment 4121 and the second pipe segment 4122 have a height difference along the Z axis; the first two-way stop valve and the second two-way stop valve are arranged at the other end of the first pipe segment 4121 and the other end of the second pipe segment 4122, so that the fifth pipe segment 4125 is nested in the heat dissipation fin 42; when assembling the sodium electric commercial energy storage cabinet, the battery pack 3 is placed behind the support mechanism 2, and a plurality of heat dissipation fins 42 with the fifth pipe segment 4125 nested therein are placed on one side of the support mechanism 2, so that the fifth pipe segment 4125 is connected to the first pipe segment 4121 and the second pipe segment 4122 through the first two-way stop valve and the second two-way stop valve to form a loop. The split type phase change gravity heat pipe 412 makes the first pipe segment 4121, the second pipe segment 4122, the third pipe segment 4123 and the fourth pipe segment 4124 located on the battery pack 3, and the fifth pipe segment 4125 is nested in the heat dissipation fin 42, which makes the assembly of the sodium electric commercial energy storage cabinet more simple and fast, and eliminates the interference between the phase change gravity heat pipe 412 and the support mechanism 2 during installation, as well as the problem of how to nest the heat dissipation fin 42 in the outer wall of the phase change gravity heat pipe 412 in a limited space. In addition, the flow of the phase change working medium can be adjusted through the first two-way stop valve and the second two-way stop valve to realize dynamic thermal management.

[0067] When the battery pack 3 generates heat due to temperature rise, the heat generated by the battery pack 3 is conducted to the evaporation chamber 411 of the cooling assembly 41, and the phase change working medium in the evaporation chamber 411 absorbs the heat generated by the battery pack 3 to reduce the temperature of the battery pack 3. The heat absorbed by the phase change working medium from the battery pack 3 is used to sublimate the phase change working medium from a liquid state to a gaseous state, and the other part is used to increase the temperature of the gaseous phase change working medium. The gaseous phase change working medium rises and enters the third pipe segment 4123, and flows to the first pipe segment 4121 under the push of the pressure difference, and then flows to the fifth pipe segment 4125. The gaseous phase change working medium transfers heat to the fifth pipe segment 4125, and the fifth pipe segment 4125 transfers heat to the heat dissipation fin 42 sleeved on the outer wall. Since the heat dissipation fin 42 has a large heat dissipation area, it can effectively and quickly perform convective heat exchange with the surrounding air to dissipate heat to the surrounding environment, thereby cooling and re-liquefying the phase change working medium. The liquefied phase change working medium flows back to the second pipe segment 4122 under the action of gravity, and then continues to flow to the fourth pipe segment 4124, and finally falls back into the evaporation chamber 411.

[0068] In the embodiment, the inner wall of the third tube segment 4123 at the connection with the evaporation chamber 411 is provided with a hydrophilic film. On the one hand, the hydrophilic film can prevent gas blockage, ensure the stability of the flow of the vapor-phase phase change working medium, and avoid flow fluctuation caused by gas blockage; on the other hand, the hydrophilic film can reduce the flow resistance of the vapor-phase phase change working medium, so that the vapor-phase phase change working medium can flow more smoothly into the phase change gravity heat pipe 412, and the heat dissipation efficiency is improved.

[0069] It should be noted that the design of the cooling assembly 41 needs to consider the phase change state of the internal phase change working medium liquid phase and vapor phase, and the VOF model is introduced to systematically calculate the phase change process. Considering that the flow of the working medium in the phase change gravity heat pipe 412 is affected by the surface tension, a continuous tension model of the surface tension needs to be established:

[0070]

[0071] wherein, is the surface tension coefficient, which is a physical property parameter of the phase change working medium; are the radii of curvature of the vapor phase and the liquid phase of the phase change working medium, respectively, which are obtained through experimental observation or VOF multiphase flow simulation; are the densities of the liquid phase and the vapor phase of the phase change working medium, respectively, which are physical property tables of the phase change working medium; , are the volume fractions of the liquid phase and the vapor phase of the phase change working medium, which are calculated in real time through VOF simulation.

[0072] This formula describes the surface tension effect of the vapor-liquid two-phase interface, which is used to determine whether the phase change working medium can form a stable bubble during vaporization or whether a continuous liquid film can be formed during liquefaction to guide the geometric shape and size design of the cooling assembly 41, so that the phase change working medium can wet the pipe wall of the phase change gravity heat pipe 412, avoid “dry burning” or liquid film rupture, and ensure that the phase change working medium can effectively return. That is, the shape and size of the evaporation chamber 411 and the phase change gravity heat pipe 412 can be designed to meet the requirements through this formula.

[0073] According to the continuity equation, the momentum equation of the phase change working medium during phase change can be obtained:

[0074]

[0075] wherein, is the density of the phase change working medium, which is calculated by weighting the physical properties and the volume fraction of the phase change working medium; is the velocity vector, which is obtained by solving and is the target variable; is the time, which is the time step of simulation or experiment; is the acceleration of gravity, which is a constant; is the pressure, which is obtained by solving; is the dynamic viscosity, calculated by the phase change working medium properties and volume fraction, is the unit tensor, which is a constant.

[0076] The flow velocity of the phase change working medium in the phase change gravity heat pipe 412 is predicted by this formula, whether the backflow requirement is met is determined, the pressure difference in the phase change gravity heat pipe 412 is analyzed, the phase change working medium is driven to circulate, flow stagnation or local high pressure is avoided, the effect of gravity on backflow is verified, and it is ensured that the liquid phase change working medium can return to the evaporation chamber 411 smoothly. That is, the flow velocity distribution of the phase change working medium in the phase change gravity heat pipe 412 is simulated by this formula, and then the diameter, length and the like of the phase change gravity heat pipe 412 are optimized, and the flow efficiency is optimized.

[0077] The continuity equation is combined with heat exchange to obtain the energy equation of the phase change working medium during phase change:

[0078]

[0079] wherein, is the energy, which is obtained according to the latent heat of vaporization and the internal heat; is the temperature, which is determined by the temperature of the battery cell 3211 in the battery pack 3 and the internal temperature of the phase change gravity heat pipe 412; is the thermal conductivity, which is the thermal conductivity of the liquid phase change working medium; is the energy source term, which is determined by the working condition of the battery pack 3; is the velocity vector, which is obtained by solving the momentum equation.

[0080] The temperature distribution of each section in the phase change gravity heat pipe 412 is predicted by this formula, the overall heat balance performance of the phase change gravity heat pipe 412 is verified, it is ensured that the cooling assembly 41 can efficiently absorb the heat generated by the battery cell 3211, can fully release the heat to the external environment, and the temperature distribution uniformity inside the battery pack 3 is predicted, local overheating or insufficient heat dissipation is avoided, and the performance of the phase change gravity heat pipe 412 is optimized.

[0081] The liquid filling rate of the phase change working medium in the evaporation chamber 411 also needs to be considered in the cooling assembly 41. If the liquid filling rate is too small, the evaporation amount of the phase change working medium will be too large, but the condensation amount will be insufficient, resulting in that the excess heat in the battery pack 3 is not absorbed, and the cooling performance of the cooling assembly 41 is poor. If the liquid filling rate is too large, the internal thermal resistance of the evaporation chamber 411 will increase, when the heat power of the battery pack 3 is small, the temperature has not reached the complete boiling temperature, only the evaporation heat transfer of the liquid film is relied on, and the excess liquid will form a liquid pit to hinder the evaporation of the liquid film and increase the thermal resistance of the phase change working medium. Therefore, the liquid filling rate is calculated by the Streltsov model:

[0082]

[0083] wherein, is the evaporating section length, corresponding to the evaporating chamber 411; is the condensing section length, corresponding to the fifth pipe section 4125 embedded in the heat dissipation fins 42 on both sides of the supporting mechanism 2; is the adiabatic section length, corresponding to the part of the phase-change gravity heat pipe 412 connecting the evaporating chamber 411 and the condensing section, is the cross-sectional area of the phase-change gravity heat pipe 412, is the latent heat of the phase-change working medium, and Q is the heat flow. That is, according to the section lengths and cross-sectional areas of the cooling assembly 41, the liquid filling rate of the phase-change working medium is determined.

[0084] In the embodiment, the phase-change working medium is trifluorotrichloroethane (R113). R113 has a low boiling point at the saturation vapor pressure corresponding to the working temperature of the phase-change gravity heat pipe 412, and the vapor formed can well wet the wall surface of the phase-change gravity heat pipe 412 to form a continuous liquid film that can return flow, and has a high thermal conductivity and latent heat, a large surface tension, a low viscosity, and is economical and environmentally friendly.

[0085] Optionally, the cabinet 1 is provided with a plurality of fans on one side along the Y axis, and the plurality of fans are all opposite to the plurality of heat dissipation fins 42. The cabinet 1 is provided with a louver on the other side along the Y axis, and the louver is used for ventilation. The fan is opposite to the heat dissipation fin 42, accelerates the air flow on the surface of the heat dissipation fin 42, quickly carries away the heat released by the condensing section, improves the circulation efficiency of the cooling mechanism 4, and the air in the cabinet 1 carries heat and is discharged from the louver on the other side, forming a one-way linear air flow to avoid the return flow of hot air.

[0086] It should be noted that the opening and closing and speed of the fan are dynamically adjusted according to the temperature of the battery compartment 11, further reducing energy consumption.

[0087] Optionally, the inner wall and / or the outer wall of the cabinet 1 is provided with a first heat insulating member. The first heat insulating member can block the influence of external high temperature or low temperature on the battery compartment 11, maintain the temperature stability in the battery compartment 11, and through the setting of the first heat insulating member, the temperature difference between the inside and outside of the cabinet 1 can be reduced, the condensation on the inner wall of the cabinet 1 can be avoided, and problems such as electrical short circuit caused by water vapor can be prevented.

[0088] In some embodiments, the inner wall of the cabinet 1 is provided with a first heat insulating member; in other embodiments, the outer wall of the cabinet 1 is provided with a first heat insulating member; and in still other embodiments, the inner wall and the outer wall of the cabinet 1 are both provided with a first heat insulating member. The specific setting mode is determined according to actual needs, and the embodiment is not limited.

[0089] Specifically, the first thermal insulation member can be a rock wool board, a metal composite thermal insulation board, or the like. Any structure capable of thermal insulation in the prior art can be used as the first thermal insulation member in the embodiment, which is not limited in the embodiment. The first thermal insulation member can be arranged on the inner wall and / or the outer wall of the cabinet body 1 by means of adhesive fixing, bolted plate fixing, or the like. The specific arrangement manner is not limited in the embodiment.

[0090] Optionally, as shown in Figure 1 , Figure 5 , the support mechanism 2 includes a plurality of supporting assemblies 22 and two bracket assemblies 21 spaced along the X axis. The bracket assembly 21 has an avoiding space penetratingly arranged along the X axis, and the phase-change gravity heat pipe 412 can extend to one side of the support mechanism 2 through the avoiding space. The plurality of supporting assemblies 22 are spaced along the Z axis, and the two ends of the supporting assembly 22 are connected to the two bracket assemblies 21, respectively. The battery pack 3 is placed on the supporting assembly 22. The two bracket assemblies 21 are spaced along the X axis, and the bracket assembly 21 has an avoiding space penetratingly arranged along the X axis, so that the bracket assembly 21 provides a mounting basis for the plurality of supporting assemblies 22 arranged along the Z axis, and when the battery pack 3 is placed on the support mechanism 2, the phase-change gravity heat pipe 412 can extend to the outside of the support mechanism 2 through the avoiding space to the left or right, avoiding interference between the phase-change gravity heat pipe 412 and the support structure. The plurality of supporting assemblies 22 are spaced along the Z axis, so that the plurality of battery packs 3 can be stably placed layer by layer along the Z axis.

[0091] In the embodiment, as shown in Figure 5 , the bracket assembly 21 includes two bracket bodies 211 spaced along the Y axis, and the avoiding space is formed between the two bracket bodies 211. Specifically, the two ends of the bracket body 211 are connected to the inner wall of the cabinet body 1 by means of riveting, welding, threaded connection, or the like. By arranging the two bracket bodies 211 spaced along the Y axis, the avoiding space can be simply formed without subsequent processing, saving cost and being simple and fast to produce.

[0092] In the embodiment, as shown in Figure 5 , the supporting assembly 22 includes two supporting members 221 arranged on the two bracket assemblies 21, respectively, and the two supporting members 221 collectively support one battery pack 3. Specifically, the supporting member 221 is connected to the two bracket bodies 211 of the bracket assembly 21 by means of riveting, welding, threaded connection, or the like. By this design, the material usage of the supporting assembly 22 can be reduced without affecting the normal performance of the supporting assembly 22.

[0093] Optionally, as shown in Figure 6As shown in the figure, the battery pack 3 further comprises a box 31 and the above-mentioned battery module 32, the box 31 has a receiving cavity 311, and the top end of the box 31 has an opening; the battery module 32 is fixedly received in the receiving cavity 311, and the cooling assembly 41 is sealingly covered on the opening and abuts against the battery module 32. By abutting the cooling assembly 41 against the battery module 32, when the battery pack 3 works, the heat generated by the battery module 32 can be directly transmitted to the cooling assembly 41, and the heat transmission is more direct and rapid.

[0094] Specifically, as shown in the figure, Figure 4 The cooling assembly 41 further comprises a mounting plate 33, and the evaporation chamber 411 is arranged on the mounting plate 33, and the mounting plate 33 can be sealingly covered on the opening and fixedly connected with the box 31. By arranging the mounting plate 33, the cooling assembly 41 can be more simply and quickly mounted on the box 31, and the problem that it is difficult to directly fix the evaporation chamber 411 on the box 31 is solved.

[0095] Optionally, the mounting plate 33 is threadedly connected with the box 31. It can be understood that the mounting plate 33 can also be connected by means of gluing, and the present embodiment is not limited in this regard.

[0096] Specifically, a sealing member is arranged between the box 31 and the cooling assembly 41, so that the cooling assembly 41 can be sealingly covered on the opening of the box 31. The sealing member can be a rubber ring.

[0097] In an optional embodiment, a heat-conducting member is arranged between the cooling assembly 41 and the battery module 32. By arranging the heat-conducting member between the cooling assembly 41 and the battery module 32, the heat exchange speed between the battery module 32 and the cooling assembly 41 can be accelerated, so that the heat generated by the battery module 32 can be quickly transmitted to the cooling assembly 41 and released to the surrounding environment, so that the battery module 32 can be cooled in time.

[0098] Specifically, the heat-conducting member is arranged between the mounting plate 33 and the battery module 32.

[0099] Optionally, as shown in the figure, Figure 7As shown, the battery module 32 comprises a cell group 321 and a fixing assembly 322, the cell group 321 comprises a plurality of cells 3211, the plurality of cells 3211 are stacked along the Y axis, and a second thermal insulation piece 3212 is clamped between adjacent two cells 3211; the fixing assembly 322 comprises two end plates 3221 and a plurality of connecting pieces 3222, the two end plates 3221 are arranged on both sides of the cell group 321 along the Y axis, and the two ends of the connecting piece 3222 are fixed to the two end plates 3221 respectively, so that the fixing assembly 322 clamps and fixes the cell group 321. By clamping the second thermal insulation piece 3212 between adjacent two cells 3211, the heat of the cell 3211 can be blocked from affecting the adjacent cell 3211, when a single cell 3211 occurs thermal runaway, the second thermal insulation piece 3212 can prevent the heat of the thermal runaway cell 3211 from spreading, avoid triggering a chain reaction, reduce the risk of thermal runaway of the whole battery module 32, and improve the safety of the battery module 32; the cell group 321 is clamped and fixed by the two end plates 3221 and the plurality of connecting pieces 3222, so as to fix the battery module 32 as a whole, ensure that the plurality of cells 3211 will not relatively displace, and ensure the stability of the cell group 321; the battery module 32 can be stably fixed in the box body 31 by the two end plates 3221, when the battery module 32 is extruded or collided by external force, the two end plates 3221 can play a protective role for the cell group 321.

[0100] Specifically, the second thermal insulation piece 3212 is an aerogel patch.

[0101] The cell 3211 in the embodiment is a sodium-ion blade cell, which has lower sensitivity to temperature and is less likely to occur thermal runaway compared with a lithium-iron-phosphate cell, and has higher safety performance.

[0102] For example, the number of cells 3211 in the embodiment is 45, and the 45 cells 3211 are stacked along the Y axis. It can be understood that the specific number of cells 3211 is determined according to actual needs, and the embodiment does not limit this.

[0103] In the embodiment, the number of connecting pieces 3222 is four, and the four connecting pieces 3222 are arranged at the four corners of the end plate 3221 respectively, and the connecting piece 3222 and the end plate 3221 are fixed by bolt connection.

[0104] Specifically, a plurality of hoisting holes are reserved on the end plate 3221, and the hoisting mechanism can easily hoist the battery module 32 through the plurality of hoisting holes to place in the box body 31.

[0105] Optionally, as Figure 7 , Figure 8As shown, the second insulating piece 3213 is arranged between the end of the battery cell group 321 and the end plate 3221. By arranging the second insulating piece 3213, the battery cell group 321 is insulated from the end plate 3221, the electrical connection between the battery cell group 321 and the end plate 3221 is isolated, and the risk of short circuit is avoided. By arranging the second insulating piece 3213, the second insulating piece 3213 is in direct contact with the end plate 3221, the contact and wear between the battery cells 3211 at both ends of the battery cell group 321 and the end plate 3221 are prevented, and the safety performance of the battery cells 3211 is ensured.

[0106] In an optional embodiment, a plastic patch is attached to the side of the battery cell group 321 facing the end plate 3221 at both ends to form the second insulating piece 3213.

[0107] Optionally, as shown in Figure 7 , Figure 9 , Figure 10 and Figure 11 , the battery cell 3211 is provided with a positive plate 32111 and a negative plate 32112 at both ends along the X axis, the positive plate 32111 and the negative plate 32112 of the adjacent two battery cells 3211 are arranged in opposite directions, and the battery module 32 further includes an aluminum bar assembly 323. Two aluminum bar assemblies 323 are arranged at both ends of the battery cell group 321 along the X axis, the aluminum bar assembly 323 includes a plurality of aluminum bars 3231 and a first insulating piece 3232, the aluminum bar 3231 is connected to the positive plate 32111 and the negative plate 32112 of the two adjacent battery cells 3211, and the first insulating piece 3232 is arranged between the adjacent two aluminum bars 3231.

[0108] The arrangement of the battery cell 3211 is that the directions of the positive plate 32111 and the negative plate 32112 of the two adjacent battery cells 3211 are opposite, that is, the positive plate 32111 of a certain battery cell 3211 is located on the right side, the negative plate 32112 is located on the left side, the positive plate 32111 of the adjacent battery cell 3211 is located on the left side, and the negative plate 32112 is located on the right side, so that the battery cells 3211 of the battery cell group 321 are arranged in sequence with the positive and negative plates 32112 staggered; the aluminum bar assembly 323 is arranged at both sides of the battery cell group 321 along the X axis, and the aluminum bar assembly 323 includes a plurality of aluminum bars 3231, one aluminum bar 3231 connects the positive plate 32111 and the negative plate 32112 of the two adjacent battery cells 3211, so as to connect the plurality of battery cells 3211 of the battery cell group 321 in series to form a complete current path; the first insulating piece 3232 is arranged between the adjacent two aluminum bars 3231 to isolate the adjacent two aluminum bars 3231, ensure a certain creepage distance, and prevent short circuit.

[0109] Optionally, the aluminum bars 3231 are welded to the positive and negative electrode plates 32111 / 32112 of the battery cells 3211 to ensure that the aluminum bars 3231 can be in close contact with the positive and negative electrode plates 32111 / 32112 of the battery cells 3211, and ensure the reliability of the electrical conduction.

[0110] Specifically, the first insulating member 3232 can not only prevent short circuit, but also increase the structural strength of the aluminum bar assembly 323, resist vibration and impact, and prolong the service life.

[0111] In an optional embodiment, voltage detection heads and temperature sensing heads are welded on the aluminum bars 3231 to measure the voltage and temperature of each battery cell 3211. The voltage detection heads and temperature sensing heads are in communication connection with the battery management system assembly (BMS) of the battery pack 3 through signal lines.

[0112] Optionally, as shown in Figure 10 The battery pack 3 further includes a copper bar 324 and a connector, the connector is mounted on the box body 31, and the positive electrode plate 32111 of the first battery cell 3211 and the negative electrode plate 32112 of the last battery cell 3211 are connected to the connector through the copper bar 324. The positive electrode plate 32111 of the first battery cell 3211 and the negative electrode plate 32112 of the last battery cell 3211 are the total positive electrode and the total negative electrode of the battery cell group 321, and the total positive electrode and the total negative electrode are connected to the connector on the box body 31 through the copper bar 324, so that the electrical energy of the battery pack 3 can be output to an external load or input from an external power source. The size of the copper bar 324 is selected according to the actual demand, and this embodiment does not limit it.

[0113] Specifically, along the Y axis, two fixed beams are arranged on the bottom wall of the box body 31, and the battery module 32 is clamped and fixed between the two fixed beams. By arranging two fixed beams on the bottom wall of the box body 31 along the Y axis, the battery module 32 can be clamped and fixed in the box body 31. The fixed beams provide standardized mounting positions for the battery module 32, facilitating quick positioning and fixing of the battery module 32 and simplifying the assembly process.

[0114] Specifically, the end plates 3221 at both ends of the battery module 32 along the Y axis are fixedly connected with the two fixed beams, so that the battery module 32 can be more stably arranged in the box body 31, preventing the battery module 32 from shaking.

[0115] Optionally, the end plates 3221 and the fixed beams are fixedly connected through screws.

[0116] Specifically, the box body 31 in the embodiment includes a side wall and a bottom wall, and the side wall is arranged around the bottom wall to form the above-mentioned accommodation cavity 311.

[0117] In an optional embodiment, the side walls and the bottom wall are all square aluminum extruded profiles, and each adjacent side wall is connected with the side wall or the bottom wall by welding. The square aluminum extruded profile is formed by extrusion process, has a uniform cross-sectional structure and high bending and torsional strength, can effectively bear the weight of the battery module 32 and external impact force, and the welding connection mode can ensure the rigidity and stability of the overall structure of the box 31.

[0118] It should be noted that the cross-sectional shape and wall thickness of the square aluminum extruded profile are determined according to stress checking and confirmation. In the static load state, the overall deformation of the box 31 is less than 0.2 mm, and the maximum stress of the overall is less than 130 MPa.

[0119] In an optional embodiment, a plurality of mounting grooves are formed on the box 31, and the fire nozzle and the connector are mounted in the corresponding mounting grooves.

[0120] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of the present application. It is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A sodium electro-technical commercial energy storage tank based on phase change gravity heat pipes, characterized in that, The application relates to a battery cabinet, which comprises a cabinet body (1) and a supporting mechanism (2), the cabinet body (1) comprises a battery cabin (11), and the supporting mechanism (2) is arranged in the battery cabin (11); a plurality of battery packs (3) are arranged on the supporting mechanism (2) along a Z axis; a cooling mechanism (4) comprises a plurality of cooling components (41) and a plurality of heat dissipation fins (42), at least one cooling component (41) is arranged on each battery pack (3), the cooling component (41) comprises an evaporation chamber (411) and a plurality of phase-change gravity heat pipes (412), phase-change working medium is arranged in the evaporation chamber (411), two ends of the phase-change gravity heat pipe (412) are communicated with the evaporation chamber (411), the phase-change gravity heat pipe (412) extends to one side of the supporting mechanism (2) along an X axis, the phase-change gravity heat pipe (412) has a first pipe section (4121) and a second pipe section (4122) which have a height difference along the Z axis, and the outer walls of the phase-change gravity heat pipes (412) on the same side of the supporting mechanism (2) are sleeved with at least one heat dissipation fin (42). The phase-change gravity heat pipe (412) further comprises a third pipe section (4123), a fourth pipe section (4124) and a fifth pipe section (4125), the third pipe section (4123) and the fourth pipe section (4124) extend along the Z axis, the lengths of the third pipe section (4123) and the fourth pipe section (4124) are different, one end of the third pipe section (4123) is communicated with the evaporation chamber (411), the other end of the third pipe section (4123) is communicated with one end of the first pipe section (4121), the other end of the first pipe section (4121) is provided with a first two-way stop valve, one end of the fourth pipe section (4124) is communicated with the evaporation chamber (411), the other end of the fourth pipe section (4124) is communicated with one end of the second pipe section (4122), the other end of the second pipe section (4122) is provided with a second two-way stop valve, the fifth pipe section (4125) has a U-shaped structure, a plurality of heat dissipation fins (42) are sleeved on the outer wall of the fifth pipe section (4125), and the two ends of the fifth pipe section (4125) are respectively connected to the first two-way stop valve and the second two-way stop valve, so that the phase-change gravity heat pipe (412) is communicated to form a loop. The plurality of phase-change gravity heat pipes (412) are divided into two groups of phase-change gravity heat pipe groups, the two groups of phase-change gravity heat pipe groups are distributed along the X axis, the phase-change gravity heat pipes (412) on the left side of the X axis extend to one side of the supporting mechanism (2) along the X axis, and the phase-change gravity heat pipes (412) on the right side of the X axis extend to one side of the supporting mechanism (2) along the X axis. A plurality of fans are arranged on one side of the cabinet body (1) along a Y axis, the plurality of fans are opposite to the plurality of heat dissipation fins (42), and a louver is arranged on the other side of the cabinet body (1) along the Y axis, and the louver is used for ventilation. ​ 2. The phase change gravity heat pipe based sodium electrical utility energy storage tank of claim 1, wherein, ​ 3. The phase change gravity heat pipe based sodium electrical utility energy storage tank of claim 1, wherein, ​ 4. The phase change gravity heat pipe based sodium electrical utility energy storage tank of claim 1, wherein, The inner wall and / or the outer wall of the cabinet body (1) is provided with a first heat insulation member.

5. The phase change gravity heat pipe based sodium electrical utility energy storage tank of claim 1, wherein, The support mechanism (2) comprises: Two bracket assemblies (21) are arranged along the X-axis, the bracket assembly (21) has an avoiding space arranged along the X-axis, and the phase change gravity heat pipe (412) can extend to one side of the support mechanism (2) through the avoiding space; A plurality of supporting assemblies (22) are arranged along the Z-axis, and the two ends of the supporting assembly (22) are connected to the two bracket assemblies (21), respectively, and the battery pack (3) is placed in the supporting assembly (22).

6. The phase change gravity heat pipe based sodium electrical utility and commercial energy storage tank of any one of claims 1-5, wherein, The battery pack (3) further comprises: The box body (31) has a containing cavity (311), and the top end of the box body (31) has an opening; The battery module (32) is fixedly contained in the containing cavity (311), and the cooling assembly (41) is arranged on the opening and abuts against the battery module (32).

7. The phase change gravity heat pipe based sodium electrical utility and commercial energy storage tank of claim 6, wherein, A heat-conducting member is arranged between the cooling assembly (41) and the battery module (32).

8. The phase change gravity heat pipe based sodium electrical utility and commercial energy storage tank of claim 6, wherein, The battery module (32) comprises: The cell group (321) comprises a plurality of cells (3211), and the plurality of cells (3211) are stacked along the Y-axis, and a second heat insulation member (3212) is arranged between adjacent two cells (3211); The fixing assembly (322) comprises two end plates (3221) and a plurality of connecting pieces (3222), the two end plates (3221) are arranged on the two sides of the cell group (321) along the Y-axis, and the two ends of the connecting piece (3222) are fixed to the two end plates (3221), respectively, so that the fixing assembly (322) clamps and fixes the cell group (321).

9. The phase change gravity heat pipe based sodium electrical utility and commercial energy storage tank of claim 8, wherein, The cell (3211) is provided with a positive plate (32111) and a negative plate (32112) at the two ends along the X-axis, respectively, and the positive plate (32111) and the negative plate (32112) of adjacent two cells (3211) are arranged in opposite directions, and the battery module (32) further comprises an aluminum bar assembly (323), two aluminum bar assemblies (323) are arranged at the two ends of the cell group (321) along the X-axis, and the aluminum bar assembly (323) comprises: A plurality of aluminum bars (3231) are connected with the positive plate (32111) and the negative plate (32112) of two adjacent cells (3211); A first insulation member (3232) is arranged between adjacent two aluminum bars (3231).

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