Submerged energy storage battery pack

Abstract

The utility model provides a kind of submerged energy storage battery pack, belong to energy storage device field, including box top open, battery is provided in box and is full of heat-conducting medium, heat-conducting medium submerges battery;Cover is set in the top of box and is enclosed with box to form sealed space;Radiating pipe is hung in the lower of cover and is located in box;Radiating pipe is immersed in heat-conducting medium and is spaced apart between cover and battery top, and cooling medium flows in radiating pipe.The utility model sets up radiating pipe below cover, and immerse radiating pipe in heat-conducting medium, the heat generated by electric core charging and discharging, after being conducted to surrounding immersed heat-conducting medium, float to the upper portion of heat-conducting medium, heat is taken away by radiating pipe, the heat-conducting medium after being cooled by heat exchange in top due to the principle of thermal expansion and contraction and buoyancy, its density increases due to the influence of gravity itself and sink to the bottom of electric core again, so constantly expand self-circulation.

Description

Technical Field

[0001] This utility model relates to the field of energy storage device technology, and in particular to an immersion energy storage battery pack. Background Technology

[0002] With the increasing global demand for renewable energy and the growing importance of energy storage technology in power systems and electric vehicles, energy storage technology faces unprecedented opportunities and challenges. Traditional energy storage PACK designs are gradually revealing many limitations in terms of heat dissipation, safety, and energy density improvement.

[0003] In terms of heat dissipation, conventional energy storage PACKs mainly rely on air cooling or simple liquid cooling plate systems. Air cooling is relatively inefficient and cannot meet the heat dissipation requirements of the large amount of heat generated during high-power charging and discharging, which can easily lead to excessively high battery module temperatures, thereby affecting battery life, performance stability, and safety. Although liquid cooling plate heat exchange offers some improvement, it suffers from problems such as uneven coolant distribution and insufficient contact with the battery, resulting in a hot front and cold rear, and thus cannot achieve efficient and uniform thermal management.

[0004] Currently, most immersion energy storage PACKs on the market are based on traditional cold plate heat exchange designs, placing the heat exchange system at the bottom of the battery cell module (PACK). For example, the power battery pack heat dissipation system disclosed in Chinese patent CN111952498A installs the heat dissipation components at the bottom of the battery pack housing. However, the heat generated by the battery cells during charging and discharging tends to accumulate at the top of the PACK, while the temperature at the bottom of the cells remains relatively low. This results in a widening temperature difference between the top and bottom of the cells, making the current cooling effect less than ideal. Utility Model Content

[0005] In view of this, the present invention proposes an immersion energy storage battery pack to solve the problem that the current method of installing heat dissipation components at the bottom of the battery pack housing results in an unsatisfactory cooling effect.

[0006] The technical solution of this utility model is implemented as follows: This utility model provides an immersion energy storage battery pack, including a box body with an open top, a battery inside the box body and filled with a heat-conducting medium, the heat-conducting medium immersing the battery; a cover plate, which covers the top of the box body and forms a sealed space with the box body; and heat dissipation pipes, which are hung below the cover plate and located inside the box body; wherein, the heat dissipation pipes are immersed in the heat-conducting medium and are spaced apart between the cover plate and the top of the battery, and a cooling medium flows through the heat dissipation pipes.

[0007] More preferably, the heat dissipation pipe includes a first pipe segment and a second pipe segment, and several first pipe segments and second pipe segments are connected end to end and arranged in parallel. The extension directions of the two ends of the first pipe segment or the second pipe segment are perpendicular to their arrangement directions. The first pipe segment is close to the side of the box, and the free end of the first pipe segment is set as the outlet of the heat dissipation pipe. The second pipe segment is located in the center of the box, and the free end of the second pipe segment is set as the inlet of the heat dissipation pipe.

[0008] Even more preferably, the first pipe section extends in a straight line, while the second pipe section extends in a wavy shape.

[0009] More preferably, there are two sets of heat dissipation pipes, which are symmetrically arranged along the central axis of the cover plate, so that the two sets of second pipe sections are symmetrically arranged on both sides of the central axis of the cover plate, and the first pipe section is located on the side of the second pipe section away from the central axis of the cover plate.

[0010] A further preferred embodiment includes a first collecting trough and a second collecting trough; both the first and second collecting troughs are housed within the casing, and each has an interface extending through the cover plate to the external environment; the free ends of two sets of first pipe sections are inserted into the first collecting trough, connecting the two outlets to the interior of the first collecting trough; the free ends of two sets of second pipe sections are inserted into the second collecting trough, connecting the two inlets to the interior of the second collecting trough.

[0011] Based on the above technical solutions, preferably, the cover plate is provided with a liquid injection hole and an explosion-proof valve, through which a heat-conducting medium is filled into the box.

[0012] Based on the above technical solutions, preferably, the heat dissipation pipe is submerged at least 5 cm below the surface of the heat-conducting medium.

[0013] Based on the above technical solutions, preferably, it also includes several pipe clamps, which are arranged on the surface of the cover plate facing the inside of the box; wherein, the heat dissipation pipes are hung below the cover plate by the pipe clamps.

[0014] Based on the above technical solutions, the preferred cooling medium is a 50% ethylene glycol aqueous solution.

[0015] More preferably, the heat dissipation pipe also includes fins, with several fins spaced apart, and the first pipe section or the second pipe section passing through several fins. The fins conduct heat from the heat-conducting medium and exchange heat with the first pipe section or the second pipe section.

[0016] The immersion energy storage battery pack of this utility model has the following advantages over the prior art:

[0017] (1) This utility model provides a heat dissipation pipe under the cover plate and immerses the heat dissipation pipe in the heat-conducting medium. The heat generated by the charging and discharging of the battery cell is conducted to the surrounding immersed heat-conducting medium and then floats to the upper part of the heat-conducting medium. The heat is carried away through the heat dissipation pipe. The heat-conducting medium at the top, after being cooled by heat exchange, has increased density due to the principle of thermal expansion and contraction and buoyancy. Under the influence of gravity itself, it sinks to the bottom of the battery cell. This continuous self-circulation allows the temperature of the battery cell module to be controlled in an ideal and stable range during the charging and discharging process, which helps to extend the life of the battery cell and its safety.

[0018] (2) The present invention designs the heat dissipation pipe as two pipe sections, with the wavy second pipe section set on the inside and the straight first pipe section set on the outside, so that the cooling medium in the heat dissipation pipe can fully exchange heat with the heat conduction medium when passing through the second pipe section, and at the same time, the heat can be quickly sent out of the box through the first pipe section. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a perspective view of the battery pack of this utility model;

[0021] Figure 2 This is a top view of the heat dissipation pipe of this utility model;

[0022] Figure 3 This is a side sectional view of the battery pack of this utility model;

[0023] Figure 4 This is a perspective view of another embodiment of the heat dissipation pipe of this utility model.

[0024] In the diagram: 1. Box body; 11. Liquid injection hole; 12. Explosion-proof valve; 2. Cover plate; 3. Heat dissipation pipe; 31. First pipe section; 32. Second pipe section; 33. Fin; 301. Inlet; 302. Outlet; 4. First collection channel; 41. Interface; 5. Second collection channel; 6. Pipe clamp. Detailed Implementation

[0025] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0026] like Figure 1 As shown, combined with Figure 2 and Figure 3 The present invention relates to an immersion energy storage battery pack, comprising a housing 1, a cover plate 2, and a heat dissipation pipe 3.

[0027] The enclosure 1 has an open top and houses the battery, which is filled with a heat-conducting medium that completely submerges the battery. A crossbeam is installed inside the enclosure 1, and the battery is mounted on the crossbeam using fasteners. The heat-conducting medium is fluorinated oil and must be insulating to prevent battery damage and leakage.

[0028] The cover plate 2 is placed on the top of the box 1 and forms a sealed space with the box 1.

[0029] The heat dissipation pipe 3 is hung below the cover plate 2 and located inside the box 1; the heat dissipation pipe 3 is immersed in the heat-conducting medium and is spaced between the cover plate 2 and the top of the battery, and the cooling medium flows through the heat dissipation pipe 3.

[0030] This scheme utilizes the thermodynamic principles of thermal expansion and contraction and buoyancy. Specifically, the principle of thermal expansion and contraction states that when a fluid (liquid or gas) is heated, the thermal motion of its molecules intensifies, increasing the distance between molecules and causing the fluid's volume to expand. For a given mass of fluid, volume expansion means a decrease in density; according to the definition of density, density equals mass divided by volume. With a constant mass, an increase in volume results in a decrease in density. The principle of buoyancy is based on Archimedes' principle: the buoyant force on an object in a fluid is equal to the weight of the fluid it displaces. When the fluid is heated and its density decreases, the surrounding cooler, denser fluid will exert an upward buoyant force on the heated fluid. Once this buoyant force exceeds the weight of the heated fluid itself, the heated fluid will begin to rise under the influence of buoyancy. Therefore, a heat exchange pipe 3 with heat exchange properties is placed above the battery cell module. When the battery cell generates heat during charging and discharging, the heat is conducted to the surrounding submerged heat-conducting medium. The heat-conducting medium becomes less dense when heated and rises to the upper part of the heat-conducting medium. Then, the heat carried by the heat-conducting medium is carried away by the heat exchange pipe 3. When the heat-conducting medium at the top of the battery cell is cooled by the heat exchange pipe 3, its density increases, and therefore it sinks to the bottom of the battery cell due to gravity. This continuous self-circulation keeps the temperature of the battery cell module in an ideal and stable range during charging and discharging, which helps to extend the battery cell's lifespan and ensure its safety.

[0031] exist Figure 2 In a preferred embodiment shown, the heat dissipation pipe 3 includes a first pipe section 31 and a second pipe section 32.

[0032] Several first pipe sections 31 and second pipe sections 32 are connected end to end and arranged in parallel. The extension directions of the two ends of the first pipe section 31 or the second pipe section 32 are perpendicular to their arrangement direction. The first pipe section 31 is close to the side of the housing 1, and the free end of the first pipe section 31 is set as the outlet 302 of the heat dissipation pipe 3. The second pipe section 32 is located in the center of the housing 1, and the free end of the second pipe section 32 is set as the inlet 301 of the heat dissipation pipe 3. The heat dissipation pipe 3 is designed to consist of two pipe sections, with the wavy second pipe section 32 placed on the inside and the straight first pipe section 31 placed on the outside. This allows the cooling medium in the heat dissipation pipe 3 to fully exchange heat with the heat-conducting medium when passing through the second pipe section 32, and at the same time, it can quickly send the heat out of the housing 1 through the first pipe section 31.

[0033] exist Figure 2 In a preferred embodiment shown, the first pipe section 31 extends in a straight line, which helps to increase the flow rate of the cooling medium in the heat dissipation pipe 3 and accelerates the flow of the cooling medium carrying heat out of the housing 1; the second pipe section 32 extends in a wavy shape, which increases the length of the second pipe section 32, increases the contact area between the second pipe section 32 and the heat-conducting medium and prolongs the contact time, thus enabling the cooling medium and the heat-conducting medium in the second pipe section 32 to exchange heat more fully.

[0034] exist Figure 2 In a preferred embodiment shown, there are two sets of heat dissipation pipes 3, which are symmetrically arranged along the central axis of the cover plate 2. Two sets of second pipe segments 32 are symmetrically arranged on both sides of the central axis of the cover plate 2, with the first pipe segment 31 located on the side of the second pipe segment 32 away from the central axis of the cover plate 2. Since the heat generated by the battery cells located inside the middle of the housing 1 is more difficult to dissipate, the symmetrical arrangement of the two sets of heat dissipation pipes 3 and the location of the two sets of second pipe segments 32 in the middle of the housing 1 allow for faster and more complete heat dissipation from the central area of ​​the housing 1.

[0035] exist Figure 2 In a preferred embodiment shown, the system further includes a first flow collector 4 and a second flow collector 5.

[0036] The first and second collecting channels 4 and 5 are either pipes or shells with internal cavities, both housed within the housing 1. Each channel has an interface 41 extending through the cover plate 2 to the external environment. The free ends of the two sets of first pipe sections 31 are inserted into the first collecting channel 4, connecting the two outlets 302 to the interior of the first collecting channel 4. The free ends of the two sets of second pipe sections 32 are inserted into the second collecting channel 5, connecting the two inlets 301 to the interior of the second collecting channel 5. The first and second collecting channels 4 and 5 effectively and synchronously control the flow rate and volume of the cooling medium within the two sets of heat dissipation pipes 3.

[0037] exist Figure 1 In a preferred embodiment shown, the cover plate 2 is provided with a liquid injection hole 11 and an explosion-proof valve 12. The heat-conducting medium is filled into the box 1 through the liquid injection hole 11. Since the heat-conducting medium will expand in volume during the heat exchange process, the explosion-proof valve 12 is provided to release pressure, thereby preventing the heat-conducting medium from exploding.

[0038] exist Figure 3 In a preferred embodiment shown, the heat sink 3 is submerged at least 5 cm below the surface of the heat-conducting medium. Since air bubbles may be generated during the process of the heat-conducting medium absorbing heat and rising, the air bubbles will hinder the heat-conducting medium from contacting the heat sink 3 for heat exchange. Therefore, the heat sink 3 is submerged at one end below the surface of the heat-conducting medium so that the air bubbles float on the surface of the heat-conducting medium and the heat sink 3 is prevented from contacting the air bubbles.

[0039] exist Figure 2 In a preferred embodiment shown, a plurality of pipe clamps 6 are also included.

[0040] The pipe clamp 6 is installed on the lower surface of the cover plate 2 by fasteners. The pipe clamp 6 is arranged on the surface of the cover plate 2 facing the inside of the housing 1. The heat dissipation pipe 3 is hung on the lower surface of the cover plate 2 by the pipe clamp 6, thereby fixing the heat dissipation pipe 3 to the lower surface of the cover plate 2. This allows the heat dissipation pipe 3 to have gaps with both the top of the battery cell and the lower surface of the cover plate 2, so that the outer surface of the heat dissipation pipe 3 can fully contact the heat-conducting medium.

[0041] exist Figure 3 In a preferred embodiment shown, the cooling medium is a 50% ethylene glycol aqueous solution. Ethylene glycol aqueous solution has a higher specific heat capacity, enabling it to absorb more heat and facilitating heat exchange and cooling. It can also be replaced with an industrial refrigerant.

[0042] exist Figure 4In a preferred embodiment shown, the heat dissipation pipe 3 further includes fins 33, with a plurality of fins 33 spaced apart. The arrangement direction of the plurality of fins 33 is the same as the extension direction of a single pipe segment, and the fins 33 are perpendicular to the extension direction of the pipe segment. The first pipe segment 31 or the second pipe segment 32 passes through the plurality of fins 33. The fins 33 conduct heat from the heat-conducting medium and exchange heat with the first pipe segment 31 or the second pipe segment 32. The fins 33 can increase the heat exchange contact area between the heat dissipation pipe 3 and the heat-conducting medium, which helps to improve the heat exchange efficiency of the heat-conducting medium. A cooling groove can be formed on the lower surface of the cover plate 2 so that the fins 33 are engaged in the cooling groove.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A submersible energy storage battery pack, characterized in that, include: The box (1) has an open top and is equipped with a battery and filled with a heat-conducting medium, which immerses the battery. A cover plate (2) is placed on top of the box body (1) and forms a sealed space with the box body (1); The heat dissipation pipe (3) is hung below the cover plate (2) and located inside the box (1); The heat dissipation pipe (3) is immersed in the heat-conducting medium and is spaced between the cover plate (2) and the top of the battery. The heat dissipation pipe (3) is filled with a cooling medium.

2. The submersible energy storage battery pack according to claim 1, characterized in that: The heat dissipation pipe (3) includes a first pipe section (31) and a second pipe section (32). A number of first pipe segments (31) and second pipe segments (32) are connected end to end and arranged in parallel, and the extension directions of the two ends of the first pipe segment (31) or the second pipe segment (32) are perpendicular to their arrangement directions. The first pipe section (31) is located near the side of the casing (1), and the free end of the first pipe section (31) is set as the outlet (302) of the heat dissipation pipe (3); The second pipe section (32) is located in the center of the housing (1), and the free end of the second pipe section (32) is set as the inlet (301) of the heat dissipation pipe (3).

3. The submersible energy storage battery pack according to claim 2, characterized in that: The first pipe section (31) extends in a straight line, while the second pipe section (32) extends in a wavy shape.

4. The submersible energy storage battery pack according to claim 2, characterized in that: There are two sets of heat dissipation pipes (3). The two sets of heat dissipation pipes (3) are symmetrically arranged along the central axis of the cover plate (2), so that the two sets of second pipe sections (32) are symmetrically arranged on both sides of the central axis of the cover plate (2). The first pipe section (31) is arranged on the side of the second pipe section (32) away from the central axis of the cover plate (2).

5. The submersible energy storage battery pack according to claim 4, characterized in that: It also includes the first flow collector (4) and the second flow collector (5); The first collection trough (4) and the second collection trough (5) are both located inside the box (1). The first collection trough (4) and the second collection trough (5) are both provided with an interface (41). The interface (41) extends through the cover plate (2) to the external environment. The free ends of the two sets of the first pipe sections (31) are inserted into the first collection tank (4), and the two outlets (302) are connected to the interior of the first collection tank (4); The free ends of the two sets of the second pipe sections (32) are inserted into the second collection tank (5), and the two inlets (301) are connected to the interior of the second collection tank (5).

6. The submersible energy storage battery pack according to claim 1, characterized in that: The cover plate (2) is provided with a liquid injection hole (11) and an explosion-proof valve (12), through which a heat-conducting medium is filled into the box (1).

7. The submersible energy storage battery pack according to claim 1, characterized in that: The heat dissipation pipe (3) is submerged at least 5 cm below the surface of the heat-conducting medium.

8. The submersible energy storage battery pack according to claim 1, characterized in that, Also includes: Several pipe clamps (6) are arranged on the plate surface of the cover plate (2) facing the inside of the box body (1); The heat dissipation pipe (3) is hung below the cover plate (2) by a pipe clamp (6).

9. The submersible energy storage battery pack according to claim 1, characterized in that: The cooling medium is a 50% ethylene glycol aqueous solution.

10. The submersible energy storage battery pack according to claim 2, characterized in that: The heat dissipation pipe (3) also includes fins (33). A plurality of fins (33) are arranged at intervals, and the first pipe section (31) or the second pipe section (32) passes through the plurality of fins (33). The fins (33) conduct heat of the heat-conducting medium and exchange heat with the first pipe section (31) or the second pipe section (32).

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