Stationary immersion battery pack

Abstract

The utility model relates to battery technology field, specifically disclose a kind of standing immersion type battery pack, including battery box, support, battery module, immersion liquid and heat dissipation structure, battery box is equipped with a sealed cavity, immersion liquid is stationary in sealed cavity;Battery box has two opposite side walls along first direction, first channel extending along vertical direction is equipped between battery module and the inner wall surface of two side walls, and heat dissipation structure is arranged in the outer wall surface of one side wall;Battery module is fixed in sealed cavity by support and immersed in immersion liquid, support makes the above and below of battery module respectively with the second channel for immersion liquid extending along first direction, first channel is communicated with second channel, and first direction is perpendicular to vertical direction.The utility model raises battery module by support and dissipates heat by heat dissipation structure, can form the circulation of autonomous flow around battery module, cooling battery module is carried out through the circulation, effectively improve the heat dissipation effect of battery module.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a static immersion battery pack. Background Technology

[0002] With the development of lithium-ion power battery technology, the demand for lithium batteries in new energy ships is constantly increasing to meet the requirements of longer driving range. Traditional heat dissipation methods, such as using liquid cooling plates alone or immersion thermal management, have limited heat dissipation efficiency in high-density battery modules and cannot effectively control the temperature of lithium batteries, affecting their performance and lifespan.

[0003] To address the aforementioned issues, a thermal management technology combining immersion and liquid cooling plates has been introduced. This involves completely immersing the battery module in a protective fluid, while the liquid cooling plate of the battery pack directly contacts the bottom of the cells, rapidly absorbing and exchanging the heat generated by the battery, thereby significantly improving heat dissipation efficiency and battery stability.

[0004] Immersion is divided into static immersion and circulating immersion. Among them, the thermal management technology of static immersion combined with liquid cooling plate has the following technical problems in practical application: (1) Considering the system problems such as the diversion effect of coolant, pipelines are required, so the system structure is complex and the adaptability is poor; (2) Generally, fans are required to enhance heat dissipation. Due to the limited air-liquid heat exchange capacity, more fans are required, which will make the product noise too loud, increase the volume, and make it difficult to ensure the continuous operation of the energy storage system; (3) In order to reduce the temperature rise after a single discharge, the total amount of immersion oil is usually required, which will increase the battery pack volume, increase the cost, and make cooling difficult, making it difficult to maintain the continuous operation of the energy storage system and meet the energy storage and backup power cooling needs. Utility Model Content

[0005] The purpose of this utility model embodiment is to provide a static immersion battery pack with good heat dissipation effect.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A static immersion battery pack is provided, comprising a battery box, a bracket, a battery module, an immersion liquid, and a heat dissipation structure. The battery box has a sealed cavity, and the immersion liquid is placed statically within the sealed cavity. The battery box has two opposing side walls along a first direction. A first channel extending vertically is provided between the battery module and the inner wall surfaces of the two side walls. The heat dissipation structure is disposed on the outer wall surface of one of the side walls. The battery module is fixed in the sealed cavity by the bracket and immersed in the immersion liquid. The bracket provides second channels above and below the battery module for the immersion liquid to extend along the first direction. The first channel communicates with the second channel, and the first direction is perpendicular to the vertical direction.

[0008] As a further embodiment of the static immersion battery pack, the bracket includes multiple support portions, all of which are spaced apart at the bottom of the sealed cavity along the first direction. The length of each support portion extends along the second direction, and the bottom of each support portion is provided with a flow port that penetrates the support portion along the first direction. The first direction, the second direction, and the vertical direction are perpendicular to each other.

[0009] As a further embodiment of the static immersion battery pack, there are multiple flow ports, which are spaced apart along the second direction.

[0010] As a further embodiment of the static immersion battery pack, there is a gap between the inner wall surfaces of the two side walls of the battery box that are opposite each other along the first direction and the corresponding side surface of the battery module, and the gap is the first channel.

[0011] As a further embodiment of the stationary submerged battery pack, the stationary submerged battery pack further includes a first heat dissipation fin, which is fixed to the side wall having the heat dissipation structure and is located on the inner wall surface of the side wall.

[0012] As a further embodiment of the stationary immersion battery pack, the heat dissipation structure includes a thermoelectric cooler and a heat sink. The thermoelectric cooler has a heating surface and a cooling surface on its two sides along the first direction, respectively. The cooling surface is connected to the side wall, and the heating surface is connected to the heat sink.

[0013] As a further embodiment of the static immersion battery pack, the heat dissipation structure also includes a thermally conductive pad, the cooling surface is connected to the side wall through the thermally conductive pad, and the heating surface is bonded to the heat sink through thermally conductive adhesive.

[0014] As a further embodiment of the stationary immersion battery pack, there are multiple heat sinks, which are spaced apart along the second direction. Each heat sink corresponds to multiple semiconductor cooling chips, and the first direction, the second direction, and the vertical direction are perpendicular to each other.

[0015] As a further embodiment of the stationary submerged battery pack, the heat dissipation structure further includes a heat dissipation shroud and a fan. The heat dissipation shroud covers the heat sink and is fixed to the outer wall of the side wall. The heat dissipation shroud has two opposing side plates along the second direction. One side plate has an air inlet, and the other side plate has an air outlet. The fan is installed inside the heat dissipation shroud to exhaust the heat inside the heat dissipation shroud through the air outlet. The first direction, the second direction, and the vertical direction are perpendicular to each other.

[0016] As a further embodiment of the static immersion battery pack, the heat dissipation structure further includes a heat insulation section located inside the heat dissipation shroud and disposed between the heat sink and the side wall. The heat insulation section has a clearance hole for the semiconductor cooling chip to pass through.

[0017] As a further embodiment of the static immersion battery pack, the battery box includes a box body, a cover plate, and a pressure relief valve. The cover plate is fixed to the open end of the box body to form the sealed cavity, and the pressure relief valve is disposed on the cover plate. There is a gap between the level of the immersion liquid and the inner wall surface of the cover plate.

[0018] Beneficial effects:

[0019] This invention places a heat dissipation structure on the outer wall of one side wall of the battery box along a first direction. A bracket elevates the battery module, forming a second channel between the bottom of the battery module and the bottom wall of the sealed cavity, and another second channel between the top of the battery module and the top wall of the sealed cavity. These two second channels communicate with the first channels on both sides of the battery module along the first direction. The heat dissipation structure first cools the immersion liquid in one of the adjacent first channels. The cooled immersion liquid sinks and flows autonomously into the second channel below the battery module. As the immersion liquid contacts the battery module, its temperature gradually increases. The heated immersion liquid then flows autonomously into the first channel on the other side of the battery module, and continues to flow upwards to the second channel above the battery module. The immersion liquid in this second channel cools down and then sinks back down along the first channel, thus forming a circulating flow around the battery module. This circulation effectively cools the battery module and improves its heat dissipation.

[0020] Compared with existing thermal management technologies that combine immersion and liquid cooling plates, the static immersion battery pack of this invention does not require a liquid cooling plate at the bottom of the battery box, omits connecting pipes and pipe joints, has high flexibility, reduces welding and sealing difficulty, has a simple structure, low production cost, and good heat dissipation effect; there is no pressure fluctuation inside the battery pack due to flow, reducing the risk of leakage.

[0021] The static immersion battery pack of this invention can meet the cooling needs of energy storage, backup power and other application scenarios. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the static immersion battery pack described in an embodiment of the present invention. Figure 1 ;

[0024] Figure 2This is a schematic diagram of the static immersion battery pack (excluding the cover plate) described in an embodiment of the present invention. Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the assembly structure of the housing, the first heat dissipation fins, and the bracket described in an embodiment of the present utility model;

[0026] Figure 4 for Figure 3 A schematic diagram of a longitudinal section along the second direction;

[0027] Figure 5 This is a schematic diagram of the longitudinal section of the static immersion battery pack along the first direction according to an embodiment of the present invention;

[0028] Figure 6 for Figure 5 A magnified view of part A in the middle;

[0029] Figure 7 This is a cross-sectional schematic diagram of the static immersion battery pack described in an embodiment of the present invention;

[0030] Figure 8 This is an exploded view of the static immersion battery pack described in an embodiment of the present invention.

[0031] In the picture:

[0032] 100. Battery box; 1001. First channel; 1002. Second channel; 110. Box body; 120. Cover plate; 130. Pressure relief valve; 200. Bracket; 210. Support part; 220. Flow port; 300. Battery module; 310. Battery cell; 320. End plate; 330. Aluminum busbar; 400. Immersion liquid; 500. Heat dissipation structure; 510. Semiconductor cooling chip; 520. Heat sink; 521. Second heat dissipation fin; 530. Thermal pad; 540. Heat dissipation cover; 541. Air inlet; 550. Fan; 560. Heat insulation part; 561. Clearance hole; 600. First heat dissipation fin. Detailed Implementation

[0033] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationships shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are merely used for distinction in description and have no special meaning.

[0037] like Figures 1 to 6 As shown, this embodiment provides a static immersion battery pack, including a battery box 100, a bracket 200, a battery module 300, an immersion liquid 400, and a heat dissipation structure 500. The battery box 100 has a sealed cavity, and the immersion liquid 400 is placed statically in the sealed cavity. The battery box 100 has two opposing side walls along a first direction (X direction in the figure). A first channel 1001 extending in a vertical direction (Z direction in the figure) is provided between the battery module 300 and the inner wall surface of the two side walls. The heat dissipation structure 500 is disposed on the outer wall surface of one of the side walls. The battery module 300 is fixed in the sealed cavity by the bracket 200 and immersed in the immersion liquid 400. The bracket 200 provides second channels 1002 above and below the battery module 300 for the immersion liquid 400 to extend along the first direction. The first channel 1001 and the second channel 1002 are connected, and the first direction is perpendicular to the vertical direction.

[0038] In this embodiment, the heat dissipation structure 500 is disposed on the outer wall of one side wall of the battery box 100 along the first direction. The battery module 300 is raised by the bracket 200, so that a second channel 1002 is formed between the bottom of the battery module 300 and the bottom wall of the sealed cavity, and a second channel 1002 is formed between the top of the battery module 300 and the top wall of the sealed cavity. The two second channels 1002 are connected to the first channels 1001 on both sides of the battery module 300 along the first direction. Understandably, the heat dissipation structure 500 first cools the immersion liquid 400 in a first channel 1001 adjacent to it. After cooling, the immersion liquid 400 sinks and flows autonomously into the second channel 1002 below the battery module 300. As the immersion liquid 400 comes into contact with the battery module 300, the temperature of the immersion liquid 400 gradually increases. The immersion liquid 400, after its temperature rises, flows autonomously into the first channel 1001 on the other side of the battery module 300, and continues to flow upward to the second channel 1002 above the battery module 300 as its temperature rises. The immersion liquid 400 in the second channel 1002 cools down and then sinks down along the first channel 1001, thus forming a circulating flow that autonomously flows around the battery module 300. This circulating flow cools the battery module 300, effectively improving the heat dissipation effect of the battery module 300 to meet the cooling requirements of energy storage and backup power.

[0039] Compared with existing thermal management technologies that combine immersion and liquid cooling plates, the static immersion battery pack of this embodiment does not require a liquid cooling plate at the bottom of the battery box 100, omits connecting pipes and pipe joints, reduces welding and sealing difficulties, has a simple structure, low production cost, and good heat dissipation effect; there is no pressure fluctuation in the battery pack caused by flow, reducing the risk of leakage.

[0040] Furthermore, such as Figures 3 to 5 As shown, the bracket 200 includes multiple support portions 210. All support portions 210 are spaced apart at the bottom of the sealing cavity along a first direction. The length of the support portion 210 extends along a second direction (Y direction in the figure). The bottom of the support portion 210 is provided with a flow port 220. The flow port 220 passes through the support portion 210 along the first direction. The first direction, the second direction and the vertical direction are perpendicular to each other.

[0041] In this embodiment, by placing the support portion 210 at the bottom of the sealed cavity to support the battery module 300, the installation convenience of the battery module 300 can be improved. By designing the length of the support portion 210 to extend along the second direction and providing a flow port 220 at the bottom of the support portion 210, the first channel 1001 and the second channel 1002 can be connected to achieve autonomous flow of the immersion liquid 400 around the battery module 300 to form a circulation. Since the battery module 300 includes multiple battery cells 310, which are connected side by side along the second direction, the support portion 210, whose length extends along the second direction, provides more stable support for the battery module 300.

[0042] Specifically, the battery module 300 also includes two end plates 320 and multiple aluminum busbars 330. All the battery cells 310 are arranged side by side along the second direction and connected to the aluminum busbars 330. The two ends along the second direction are fixed by the two end plates 320.

[0043] Furthermore, there are multiple flow ports 220, which are distributed at intervals along the second direction.

[0044] By designing multiple flow ports 220, and having the portion of the support 210 located between two adjacent flow ports 220 contact the bottom of the sealed cavity, the structural strength of the support 210 and the support stability of the support 210 for the battery module 300 can be improved.

[0045] like Figure 3 and Figure 5 As shown, this embodiment has four support portions 210, with two support portions 210 positioned near the bottom center of the sealed cavity and the other two positioned near the bottom edge of the sealed cavity. This arrangement of four support portions 210 provides stable support for the battery module 300. In other embodiments, only one support portion 210 may be positioned near the bottom center of the sealed cavity.

[0046] Furthermore, there is a gap between the inner wall surfaces of the two opposite side walls of the battery box 100 along the first direction and the corresponding side surface of the battery module 300, and the gap is the first channel 1001.

[0047] In this embodiment, since the gap between the two sides of the battery module 300 along the first direction and the inner wall of the corresponding battery box 100 is the first channel 1001, and the first channel 1001 covers the entire side of the battery module 300, the immersion liquid 400 can fully contact the battery module 300 after heat exchange with the inner wall of one side wall of the battery box 100 along the first direction, so as to cool down the battery module 300 and improve the heat dissipation effect of the battery module 300.

[0048] Furthermore, such as Figures 3 to 7As shown, the static immersion battery pack of this embodiment also includes a first heat dissipation fin 600, which is fixed on the side wall provided with the heat dissipation structure 500, and the first heat dissipation fin 600 is located on the inner wall surface of one side wall of the battery box 100 along the first direction.

[0049] In this embodiment, by setting the first heat dissipation fins 600 on the inner wall surface of the side wall with the heat dissipation structure 500, the heat dissipation area can be increased and the heat exchange capacity between the side wall and the immersion liquid 400 can be enhanced.

[0050] Furthermore, the heat dissipation structure 500 includes a thermoelectric cooler 510 and a heat sink 520. The two sides of the thermoelectric cooler 510 along the first direction are a heating surface and a cooling surface, respectively. The cooling surface of the thermoelectric cooler 510 is connected to the side wall of the battery box 100, and the heating surface of the thermoelectric cooler 510 is connected to the heat sink 520.

[0051] The outer wall of the sidewall with the first heat dissipation fin 600 is connected to the heat sink 520 via a semiconductor cooling chip 510. After the immersion liquid 400 exchanges heat with the battery module 300, the temperature rises and the heat is transferred to the sidewall. The cooling surface of the semiconductor cooling chip 510 can absorb the heat from the sidewall and diffuse it to the heating surface, which then transfers the heat to the heat sink 520 for heat dissipation.

[0052] Specifically, the semiconductor cooling chip 510 in this embodiment is also known as a TEC cooling chip (Thermoelectric Cooler) or a Peltier cooler. Its cooling principle and internal structure are conventional technologies in the field, and will not be described in detail here.

[0053] In this embodiment, a semiconductor cooling chip 510 is used to cool the side wall of the battery box 100. Compared with the conventional air-liquid heat exchange cooling method, the temperature of the outer wall surface of the side wall of the battery box 100 can be lower than the ambient temperature, thereby increasing the temperature difference between the outer wall surface of the side wall and the environment and improving the heat exchange capacity.

[0054] Since the thermoelectric cooler 510 has a strong heat exchange capacity with the side wall of the battery box 100, only one side wall of the battery box 100 needs to be cooled, thereby reducing the size of the battery pack. Since the system piping is not involved, the static immersion battery pack of this embodiment is more adaptable, and there is no need to consider the piping settings of the liquid cooling system, which can be flexibly configured.

[0055] In this embodiment, the heat dissipation structure 500 further includes a thermally conductive pad 530. The cooling surface of the semiconductor cooling chip 510 is connected to the side wall through the thermally conductive pad 530, and the heating surface of the semiconductor cooling chip 510 is bonded to the heat sink 520 through thermally conductive adhesive (not shown in the figure).

[0056] In this embodiment, a thermally conductive pad 530 is provided between the cooling surface of the thermoelectric cooler 510 and the outer wall of the side wall of the battery case 100. This allows for rapid heat transfer from the corresponding side wall of the battery case 100 to the thermoelectric cooler 510. Furthermore, the thermally conductive pad 530 absorbs installation tolerances, improving the installation stability of the thermoelectric cooler 510. The heating surface of the thermoelectric cooler 510 is bonded to the heat sink 520 using thermally conductive adhesive. This improves the connection stability between the thermoelectric cooler 510 and the heat sink 520, and also allows for rapid heat transfer from the heating surface of the thermoelectric cooler 510 to the heat sink 520.

[0057] To further improve the heat dissipation effect of the heat dissipation structure 500 on the battery module 300, this embodiment designs multiple heat sinks 520, which are spaced apart along the second direction. Each heat sink 520 corresponds to multiple semiconductor cooling chips 510, and the first direction, the second direction, and the vertical direction are perpendicular to each other. Since the temperature of the immersion liquid 400 in the battery box 100 varies in different areas, this embodiment sets up multiple heat sinks 520 and independently controls the start and stop of each heat sink 520. When the temperature of the immersion liquid 400 in a certain area is detected to be too high, only the heat sink 520 corresponding to that area is activated for heat dissipation, avoiding unnecessary energy consumption caused by the simultaneous activation of all heat sinks 520, thus achieving energy saving without affecting the heat dissipation effect.

[0058] In this embodiment, there are multiple thermoelectric coolers 510 corresponding to each heat sink 520. These multiple thermoelectric coolers 510 are spaced apart vertically to further improve heat dissipation. For example, there are four heat sinks 520, with each heat sink 520 corresponding to four thermoelectric coolers 510 spaced apart vertically. In other embodiments, the number of heat sinks 520 is not limited to four; it can be one, two, three, five, or even more. The number of thermoelectric coolers 510 corresponding to each heat sink 520 is also not limited to four; it can be one, two, three, five, or even more. Specifically, an appropriate number of heat sinks 520 and thermoelectric coolers 510 can be designed according to the dimensions of the battery box 100 and the heat sinks 520, which will not be elaborated further here.

[0059] Furthermore, such as Figure 8 As shown, the heat dissipation structure 500 also includes a heat dissipation shroud 540 and a fan 550. The heat dissipation shroud 540 covers the heat sink 520 and is fixed to the outer wall of the side wall. The heat dissipation shroud 540 has two opposing side plates along the second direction. One side plate has an air inlet 541 and the other side plate has an air outlet (not shown in the figure). The fan 550 is installed inside the heat dissipation shroud 540 and is used to discharge the heat inside the heat dissipation shroud 540 through the air outlet. The first direction, the second direction and the vertical direction are perpendicular to each other.

[0060] In this embodiment, by covering the heat sink 520 with a heat sink 540, dust accumulation on the surface of the heat sink 520 can be prevented from affecting its heat dissipation effect. Furthermore, the air inlet 541 and air outlet are arranged opposite each other along a second direction, forming a heat dissipation airflow channel within the heat sink 540. The fan 550 is positioned within this airflow channel, creating strong convection currents to improve the heat exchange between the outside air and the heat sink 520. The stationary submerged battery pack of this embodiment is suitable for various server racks, including standard racks such as 19-inch and 21-inch racks in data centers, as well as other non-standard racks and similar air-cooled scenarios, fully meeting the cooling needs of energy storage, backup power, and other application scenarios.

[0061] Furthermore, the fan 550 is positioned near the air inlet 541, which can quickly introduce air from outside the heat sink 540 into the heat sink 540 to exchange heat with the heat sink 520, and then exhaust it through the air outlet.

[0062] Since the side wall of the battery box 100 is cooled by a semiconductor cooling chip 510, the fan 550 only needs to meet the heat dissipation of the semiconductor cooling chip 510, so a large air volume is not required. Therefore, the number of fans 550 can be reduced and the noise can be reduced.

[0063] For example, such as Figure 8 As shown, the number of fans 550 in this embodiment is three.

[0064] The outer side of the heat sink 520 (except for the side connected to the semiconductor cooling chip 510) has a plurality of second heat dissipation fins 521. All the second heat dissipation fins 521 are distributed at intervals in the vertical direction, and a gap for air circulation is formed between two adjacent second heat dissipation fins 521. At this time, the heat sink 540 is facing the side wall of the battery box 100 adjacent to the corresponding second heat dissipation fins 521, which can minimize the size of the heat sink 540 and increase the air convection speed in the heat dissipation channel.

[0065] After the heat from the immersion liquid 400 is transferred to the heat sink 520 through the semiconductor cooling chip 510, the temperature of the heat sink 520 rises, and its heat diffuses into the surrounding air to form hot air. If the hot air comes into contact with the side wall of the battery box 100, it will affect the heat dissipation effect. To address this, this embodiment adds a heat insulation part 560, which separates the side wall of the battery box 100 from the heat sink 520, thereby providing thermal insulation for the side wall of the battery box 100. Specifically, the heat dissipation structure 500 also includes a heat insulation part 560, which is located inside the heat sink 540 and is disposed between the heat sink 520 and the side wall. The heat insulation part 560 has a clearance hole 561 for the semiconductor cooling chip 510 to pass through. The heat insulation part 560 can prevent the loss of cold air from the side wall of the battery box 100 and the condensation caused by the side wall coming into contact with the external hot air. By opening the clearance hole 561 on the heat insulation part 560, the thickness of the heat insulation part 560 can be reasonably designed by the thickness of the semiconductor cooling chip 510, so that the semiconductor cooling chip 510 passing through the clearance hole 561 can be connected to the side wall of the battery box 100 and the heat sink 520.

[0066] In this embodiment, the clearance hole 561 can correspond one-to-one with each thermoelectric cooler 510; in other embodiments, the clearance hole 561 can also correspond to all the thermoelectric coolers 510 corresponding to each heat sink 520, that is, all the thermoelectric coolers 510 corresponding to each heat sink 520 are located inside the hole of the clearance hole 561.

[0067] The heat insulation part 560 can be made of heat insulation cotton, foam material or heat insulation coating, all of which have good heat insulation effect.

[0068] In this embodiment, heat insulation parts 560 can also be provided on each side wall of the battery box 100 to enhance the heat preservation performance of the battery box 100.

[0069] In this embodiment, as Figure 1 , Figure 5 and Figure 8 As shown, the battery box 100 includes a box body 110, a cover plate 120 and a pressure relief valve 130. The cover plate 120 is fixed to the open end of the box body 110 to form a sealed cavity, and the pressure relief valve 130 is disposed on the cover plate 120. There is a gap between the liquid level of the immersion liquid 400 and the inner wall surface of the cover plate 120.

[0070] In the prior art, the immersion liquid 400 is usually filled into the entire sealed cavity of the battery box 100, which causes a conflict between the safe depressurization of the battery pack and the working pressure of the battery pack.

[0071] In this embodiment, the immersion fluid 400 is not fully filled but completely submerges the battery module 300. A space is reserved above the immersion fluid 400 to store gas. This gas can buffer the pressure surge during thermal runaway of the battery cell 310, resolving the conflict between the battery pack's safe pressure relief and its operating pressure. Furthermore, the amount of gas above the immersion fluid 400 (usually air, but other inert gases can also be present) is limited, ensuring the immersion fluid 400 is only in contact with a small amount of air, thus avoiding oxidation and aging issues and not affecting its lifespan. This static immersion method of battery pack in this embodiment avoids the pressure problems associated with existing cyclic immersion battery packs.

[0072] The static immersion battery pack of this embodiment only requires adjustments to the outside of the battery box 100 of a conventional static immersion battery pack to improve heat dissipation. That is, the static immersion battery pack of this embodiment and the conventional static immersion battery pack can share the box 110 of the battery box 100, reducing material costs.

[0073] The assembly steps of the static immersion battery pack in this embodiment are as follows: The battery module 300 is fixed in the sealed cavity by the bracket 200, then immersion liquid 400 (generally immersion oil) is poured into the housing 110, and then the cover plate 120 is installed. A thermally conductive pad 530, a thermoelectric cooler 510, a heat sink 520, a fan 550, and a heat sink 540 are installed on one side wall of the battery housing 100 along its width direction (first direction). A corresponding operating temperature for the thermoelectric cooler 510 in each heat sink 520 is set, and a temperature monitoring point is set. When the temperature of the cooling surface of the thermoelectric cooler 510 in that area reaches 15°C, the thermoelectric cooler 510 in that area is turned off; when the temperature reaches 18°C, the thermoelectric cooler 510 in that area is turned on.

[0074] Performance testing: Under the same oil level (not fully filled) and 25℃ conditions, eight 628Ah 310 cells were configured and discharged at 0.5P. The temperatures of the stationary submerged battery pack of this embodiment and the stationary submerged battery pack with only air cooling (same airflow, 90CFM) (control group) were measured (data are simulation evaluation results). The highest temperature of the stationary submerged battery pack of this embodiment was 33.2℃, while the highest temperature of the control group was 41℃, which exceeded the optimal temperature range for lifespan.

[0075] The stationary immersion battery pack of this embodiment is suitable for use as a backup power storage battery pack. It is suitable for standard cabinets such as data centers, scenarios that require flexible configuration, and can be used in environments with temperatures up to 40°C, but in locations where it is inconvenient or impossible to use chillers.

[0076] In summary, the stationary immersion battery pack of this embodiment has a higher protection level, lower transportation risks and difficulties, lower difficulty in on-site installation and commissioning, and stronger adaptability. When achieving the same temperature, compared with the air-cooled stationary immersion product, this embodiment requires fewer 550 fans, has a more compact structure, lower noise, uses less immersion oil, and has stronger temperature regulation and heat preservation capabilities.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A static immersion battery pack, characterized in that, The device includes a battery box, a bracket, a battery module, an immersion liquid, and a heat dissipation structure. The battery box has a sealed cavity, and the immersion liquid is placed in the sealed cavity. The battery box has two opposing side walls along a first direction. A first channel extending in a vertical direction is provided between the battery module and the inner wall surfaces of the two side walls. The heat dissipation structure is disposed on the outer wall surface of one of the side walls. The battery module is fixed in the sealed cavity by the bracket and immersed in the immersion liquid. The bracket provides second channels above and below the battery module for the immersion liquid to extend along the first direction. The first channel communicates with the second channel, and the first direction is perpendicular to the vertical direction.

2. The static immersion battery pack according to claim 1, characterized in that, The bracket includes multiple support parts, all of which are spaced apart at the bottom of the sealing cavity along the first direction. The length of each support part extends along the second direction. The bottom of each support part is provided with a flow port, which passes through the support part along the first direction. The first direction, the second direction, and the vertical direction are perpendicular to each other.

3. The static immersion battery pack according to claim 2, characterized in that, The flow ports are multiple, and the multiple flow ports are distributed at intervals along the second direction.

4. The static immersion battery pack according to claim 1, characterized in that, The inner wall surfaces of the two opposite sidewalls of the battery box along the first direction have a gap with the corresponding side surface of the battery module, and the gap is the first channel.

5. The static immersion battery pack according to claim 1, characterized in that, It also includes a first heat dissipation fin, which is fixed to the side wall on which the heat dissipation structure is provided, and the first heat dissipation fin is located on the inner wall surface of the side wall.

6. The static immersion battery pack according to claim 1, characterized in that, The heat dissipation structure includes a semiconductor cooling chip and a heat sink. The two sides of the semiconductor cooling chip along the first direction are a heating surface and a cooling surface, respectively. The cooling surface is connected to the side wall, and the heating surface is connected to the heat sink.

7. The static immersion battery pack according to claim 6, characterized in that, The heat dissipation structure also includes a thermally conductive pad, the cooling surface is connected to the side wall through the thermally conductive pad, and the heating surface is bonded to the heat sink through thermally conductive adhesive.

8. The static immersion battery pack according to claim 6, characterized in that, There are multiple heat sinks, which are spaced apart along the second direction. Each heat sink corresponds to multiple semiconductor cooling chips. The first direction, the second direction, and the vertical direction are perpendicular to each other.

9. The static immersion battery pack according to claim 6, characterized in that, The heat dissipation structure also includes a heat dissipation shroud and a fan. The heat dissipation shroud covers the outside of the radiator and is fixed to the outer wall of the side wall. The heat dissipation shroud has two opposing side plates along the second direction. One side plate has an air inlet and the other side plate has an air outlet. The fan is installed inside the heat dissipation shroud and is used to exhaust the heat inside the heat dissipation shroud through the air outlet. The first direction, the second direction and the vertical direction are perpendicular to each other.

10. The static immersion battery pack according to claim 9, characterized in that, The heat dissipation structure further includes a heat insulation part located inside the heat dissipation cover and disposed between the heat sink and the side wall. The heat insulation part has a clearance hole for the semiconductor cooling chip to pass through.

11. The static immersion battery pack according to any one of claims 1 to 10, characterized in that, The battery box includes a box body, a cover plate, and a pressure relief valve. The cover plate is fixed to the open end of the box body to form the sealed cavity, and the pressure relief valve is disposed on the cover plate. There is a gap between the level of the immersion liquid and the inner wall surface of the cover plate.

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