Immersed energy storage device

Abstract

The invention relates to an immersed energy storage device. The immersed energy storage device comprises a shell and a plurality of battery packs, the shell is provided with a first cavity, the shell is further provided with a liquid inlet and a liquid outlet which are communicated with the first cavity, and the liquid inlet is used for introducing cooling liquid into the first cavity; the battery packs are stacked in the first cavity in the vertical direction, the battery packs are located between the liquid inlet and the liquid outlet, each battery pack comprises a tray and a plurality of battery modules arranged on the tray at intervals, a first gap is formed between every two adjacent battery modules, and the tray is provided with a heat dissipation channel communicated with the first gaps. Through the arrangement, the cooling liquid vertically flows to the next layer of battery pack through the first gap and the heat dissipation channel, so that heat generated on the surface of the battery module can be taken away in time, and the heat dissipation efficiency is improved; and the vertically flowing cooling liquid can quickly enable all the battery packs to be completely located in the flowing cooling liquid, so that the consistency of the working temperature of the battery packs is ensured. And equipment complexity caused by arrangement of a water-cooling circulating device at present is also avoided.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an immersion energy storage device. Background Art

[0002] Energy storage batteries can store electrical energy, thereby achieving peak shaving and valley filling and improving the quality of electricity. Energy storage battery technology is currently the energy storage technology with good application prospects and the fastest development, and it occupies a mainstream position in the energy storage market.

[0003] The energy storage device includes multiple battery packs for storing electrical energy. The battery packs are composed of multiple battery cells connected in series or parallel. During the charging or discharging process of the battery pack, the battery cells will generate high heat, causing the battery cell temperature to rise, which in turn leads to reduced battery cell efficiency, shortened life or thermal runaway.

[0004] Currently, in order to cool the battery pack, a water cooling cycle is usually set up on the cold plate carrying the battery cells to cool it down. However, the above method has low heat dissipation efficiency, complex assembly, and there is also the problem of excessive temperature difference between battery packs. Summary of the invention

[0005] Based on this, it is necessary to provide an immersion energy storage device to address the problems of low heat dissipation efficiency, complex assembly, and large temperature difference between battery packs in the current battery pack heat dissipation through cold plates.

[0006] An immersion energy storage device, comprising a housing and a plurality of battery packs, wherein:

[0007] The housing has a first cavity, and the housing is also provided with a liquid inlet and a liquid outlet communicated with the first cavity, the liquid inlet is used to introduce cooling liquid into the first cavity;

[0008] A plurality of battery packs are stacked in the first cavity along a vertical direction, and the battery pack is located between the liquid inlet and the liquid discharge port. The battery pack includes a tray and a plurality of battery modules spaced apart on the tray, and a first gap is provided between two adjacent battery modules. The tray includes a frame and a bottom plate mounted on the frame, and the battery modules are provided on the bottom plate. There are a plurality of bottom plates, and the plurality of bottom plates are spaced apart, and a heat dissipation channel is formed between two adjacent bottom plates, and the heat dissipation channel is connected to the first gap.

[0009] The above-mentioned immersion energy storage device is arranged in a vertical direction by arranging multiple battery packs, and a heat dissipation channel is arranged on the bottom plate of each battery pack, and the heat dissipation channel is connected to the first gap between two adjacent battery modules in the battery pack. When the coolant flows into the first cavity through the liquid inlet, the coolant flows vertically to the next layer of battery pack through the first gap and the heat dissipation channel. On the one hand, the flowing coolant can take away the heat generated on the surface of the battery module in time, thereby improving the heat dissipation efficiency; on the other hand, the vertically flowing coolant can quickly make all battery packs completely in the flowing coolant, so that the working environment temperature of all battery packs in the first cavity is consistent, ensuring the consistency of the working temperature of the battery pack. At the same time, compared with the current method of setting a water cooling cycle on the cold plate for cooling, it also avoids setting a water cooling circulation device on each bottom plate to reduce the complexity of the equipment.

[0010] In one of the embodiments, in each of the battery packs, each of the first gaps faces one of the heat dissipation channels.

[0011] In one of the embodiments, along the vertical direction, the first gap in each layer of the battery pack is arranged opposite to the first gap in the adjacent layer through the heat dissipation channel.

[0012] In one of the embodiments, the gap between two adjacent bottom plates ranges from 10 mm to 20 mm.

[0013] In one of the embodiments, the tray further includes an insulating member, which is disposed on a side of the bottom plate facing away from the frame, and is used to support the battery module so that a second gap exists between the battery module and the bottom plate.

[0014] In one embodiment, the number of the insulating members is at least two, the two insulating members are disposed on two opposite sides of the bottom plate, and a receiving space is formed between the two insulating members and the frame.

[0015] In one of the embodiments, the accommodating space is filled with a heat dissipation structure, and the heat dissipation structure includes a metal piece and a first structural adhesive and a second structural adhesive arranged on two opposite surfaces of the metal piece.

[0016] In one embodiment, the area of ​​the metal piece accounts for at least 85% of the area of ​​the accommodating space.

[0017] In one embodiment, the metal piece is copper foil.

[0018] In one embodiment, the thickness of the metal piece is in the range of 6 μm-12 μm. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a schematic diagram of the structure of the submerged energy storage device provided in this application.

[0022] Figure 2 for Figure 1 Schematic diagram of the structure of a single battery pack.

[0023] Figure 3 for Figure 2 Another angle diagram of a single battery pack.

[0024] Figure 4 for Figure 1 A top view of the entire battery pack.

[0025] Figure 5 A schematic diagram of the structure of the tray provided for this application.

[0026] Figure 6 A schematic diagram of the structure of the framework provided for this application.

[0027] in:

[0028] 10. Immersed energy storage device; a. vertical direction; b. first direction; c. second direction;

[0029] 100. housing; 110. first cavity;

[0030] 200, battery pack; 210, tray; 211, frame; 2111, frame body; 2112, longitudinal beam; 2113, cross beam; 2114, mounting hole; 212, bottom plate; 213, heat dissipation channel; 214, insulating member; 215, accommodating space; 220, battery module; 221, cable tie; 222, first end plate; 223, battery cell; 224, second end plate; 225, third gap; 230, first gap. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0037] Research has found that in order to cool the battery pack, a water cooling cycle is usually set up on the cold plate carrying the battery cells to cool it down. However, the above method has low heat dissipation efficiency, complex assembly, and there is also the problem of excessive temperature difference between battery packs.

[0038] Based on this, see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, Figure 1 This is a schematic diagram of the structure of an immersion energy storage device 10 provided in an embodiment of the present application. Figure 2 for Figure 1 A schematic diagram of the structure of a single battery pack 200, Figure 3 for Figure 2 Another angle diagram of a single battery pack 200, Figure 4 for Figure 1 The overall top view of the battery pack 200 is shown in FIG. Figure 5 This is a schematic diagram of the structure of the tray 210 provided in this application.

[0039] An immersion energy storage device 10 provided in an embodiment of the present application includes a housing 100 and a plurality of battery packs 200, wherein the housing 100 has a first cavity 110, and the housing 100 is further provided with a liquid inlet and a liquid outlet connected to the first cavity 110, and the liquid inlet is used to introduce cooling liquid into the first cavity 110. In the specific setting, the shape of the housing 100 is not limited, and can be any geometric structure such as a rectangle, a circle, etc. having the first cavity 110 inside.

[0040] A plurality of battery packs 200 are stacked in the first cavity 110 along the vertical direction a, and the number of battery packs 200 may be 2, 3, 4, 5, 7, 9 or more. All battery packs 200 are located between the liquid inlet and the liquid outlet, and each battery pack 200 includes a tray 210 and a plurality of battery modules 220 spaced apart on the tray 210, with a first gap 230 between two adjacent battery modules 220, and the tray 210 is provided with a heat dissipation channel 213 connected to the first gap 230. In a specific configuration, the number of battery modules 220 may be 2, 4, 6, 8, 10, 12 or more. Through the above arrangement, the coolant entering the first cavity 110 from the liquid inlet flows through all the battery modules 220 in the same battery pack 200 simultaneously along the vertical direction a, flows to the heat dissipation channel 213 through the first gap 230 between the battery modules 220 and then reaches the battery pack 200 of the next layer, and is discharged through the drain port after passing through the multiple layers of battery packs 200 in sequence.

[0041] In order to more conveniently form the heat dissipation channel 213, the tray 210 includes a frame 211 and a bottom plate 212 mounted on the frame 211, a battery module 220 is arranged on the bottom plate 212, and the number of the bottom plates 212 is multiple, and the multiple bottom plates 212 are arranged at intervals, and a heat dissipation channel 213 is formed between two adjacent bottom plates 212, and the heat dissipation channel 213 is connected to the first gap 230. Through the above arrangement, the bottom plate 212 in the tray 210 is used to carry the battery module 220, and the gap between two adjacent bottom plates 212 forms a heat dissipation channel 213. Compared with the prior art method of setting a water cooling cycle on the cold plate, the present application has a simple structure and simple assembly, which can simplify the process and assembly steps in the grouping process, while also meeting the low production cost, and can achieve cost reduction and efficiency improvement for the enterprise without redundant equipment.

[0042] The above-mentioned immersion energy storage device 10 is arranged along the vertical direction a by arranging multiple battery packs 200, and a heat dissipation channel 213 is arranged on the bottom plate 212 in each battery pack 200, and the heat dissipation channel 213 is connected to the first gap 230 between two adjacent battery modules 220 in the battery pack 200. When the coolant flows into the first cavity 110 through the liquid inlet, the coolant flows vertically to the next layer of battery packs 200 through the first gap 230 and the heat dissipation channel 213. On the one hand, the flowing coolant can take away the heat generated on the surface of the battery module 220 in time, thereby improving the heat dissipation efficiency; on the other hand, the vertically flowing coolant can quickly make all battery packs 200 completely in the flowing coolant, so that the working environment temperature of all battery packs 200 in the first cavity 110 is consistent, ensuring the consistency of the working temperature of the battery packs 200. At the same time, compared with the current method of setting a water cooling cycle on the cold plate for cooling, it also avoids setting a water cooling circulation device on each bottom plate 212 to reduce the complexity of the equipment.

[0043] In order to take away more heat in time, in a preferred embodiment, in each battery pack 200, the largest side surfaces of two adjacent battery modules 220 are arranged opposite to each other and form a first gap 230. Through the above arrangement, the coolant entering the first cavity 110 will flow through the largest side surface of the battery module 220 through the first gap 230 to the heat dissipation channel 213, and then flow to the next layer of battery packs 200. In this process, the coolant contacts the largest side surface of each battery module 220, which can more effectively take away the heat generated by the battery module 220.

[0044] In the specific configuration, in each battery pack 200, multiple battery modules 220 are arranged at intervals along a first direction b, and the length direction of a single battery module 220 extends along a second direction c. The first direction b is perpendicular to the second direction c. Through the above configuration, a first gap 230 is formed between the maximum sides of two adjacent battery modules 220, which is beneficial for the coolant to quickly cool down the battery module 220 in a timely manner.

[0045] In order to further improve the heat dissipation efficiency, in the specific configuration, in each battery pack 200, the battery module 220 is suspended on the bottom plate 212. Through the above configuration, when the coolant flows from the first gap 230 to the heat dissipation channel 213 along the vertical direction a, and then flows from the heat dissipation channel 213 to the next battery pack 200, the coolant can also flow from the first gap between the battery module 220 and the bottom plate 212 to the next battery pack 200, and while taking away the heat from the largest side of the battery module 220, it can also drive the heat from the bottom of the battery module 220, further improving the heat dissipation efficiency.

[0046] Combination Figure 6 As shown, Figure 6A schematic diagram of the structure of the frame provided in this application. It should be noted that, in order to more conveniently fix the battery module 220, the frame 211 includes a frame body 2111, a longitudinal beam 2112 and a cross beam 2113, wherein the number of the longitudinal beams 2112 is multiple, and the multiple longitudinal beams 2112 are arranged at intervals in the frame body 2111, and a cross beam 2113 is arranged between two adjacent longitudinal beams 2112, and a cross beam 2113 is also arranged between the longitudinal beam 2112 adjacent to the frame body 2111 and the frame body 2111, the cross beam 2113 is connected to the bottom plate 212, the frame body 2111 is connected to the battery module, and there is a first gap between the battery module 220 and the bottom plate 212. Through the above arrangement, the frame body 2111 in the frame 211 is connected to the battery module 220, and the crossbeam 2113 in the frame 211 provides a mounting point for the bottom plate 212, so that the battery module 220 is conveniently suspended above the bottom plate 212, thereby facilitating the coolant to flow from the first gap between the battery module 220 and the bottom plate 212 to the next layer of the battery pack 200, while taking away the heat from the largest side of the battery module 220, it can also drive the heat from the bottom of the battery module 220, thereby improving the heat dissipation efficiency.

[0047] In the specific setting, the frame 2111 and the battery module 220 are detachably connected, and specifically, the frame 2111 and the battery module 220 can be detachably connected by concave-convex matching, snap connection, or detachably connected by fasteners. The present application preferably detachably connects the frame 2111 and the battery module 220 by fasteners. Through the above setting, when any component of the battery module 220 and the frame 2111 is damaged, the damaged component can be quickly replaced without affecting subsequent use. At the same time, the assembly of the battery module 220 and the frame 2111 is simple and convenient, and has high flexibility.

[0048] In order for the frame 2111 to better carry the battery module 220, the frame 2111 includes a plurality of square tube beams, which are connected end to end in sequence to form a closed geometric body with an inner cavity. In the specific setting, the number of square tube beams can be 2, 3, 4, 5 or more, and the shape of the frame 2111 formed by the square tube beams can be any closed combination of circles, ellipses, triangles, rectangles, polygons, etc. It should be noted that the square tube beams themselves have the advantages of strong bearing capacity and light weight. Through the above setting, the frame 2111 formed by the square tube beams can carry a heavy-loaded battery module 220, while not affecting the frame 2111 being suspended in the housing 100, and will not increase the bearing burden of the housing 100.

[0049] The present application uses a rectangular frame 2111 as an example for illustration. When the frame 2111 is detachably connected to the battery module 220, specifically, the front tube beam and the rear tube beam in the frame 2111 are provided with mounting holes 2114 that penetrate along the thickness direction thereof. The fasteners pass through the mounting holes 2114 and are connected to the two ends of the battery module 220, so that the battery module 220 is detachably mounted on the frame 2111. The mounting holes 2114 are preferably threaded holes. For the safety of the connection between the frame 2111 and the battery module 220, the surface of the frame 2111 is sprayed with an insulating material, which may be polyvinyl chloride, polyethylene, polypropylene, rubber, hard oxide ceramics, and other materials.

[0050] When forming the frame 2111, the connection method between two adjacent square tube beams can be welding, gluing, concave-convex fitting or snap connection. The present application preferably uses a metal material for the square tube beam to increase the load-bearing capacity of the battery module 220, and preferably uses welding to connect two adjacent square tube beams.

[0051] In order to strengthen the structural strength of the frame 2111, a plurality of longitudinal beams 2112 are provided inside the frame 2111 and along the length direction of the frame 2111. In the specific arrangement, the number of longitudinal beams 2112 can be 2, 3, 4, 5 or more. The plurality of longitudinal beams 2112 can be arranged in the frame 2111 in an evenly spaced manner, but are not limited to the above arrangement. The spacing between two adjacent longitudinal beams 2112 can be consistent, and the spacing between the longitudinal beam 2112 and the frame 2111 can be smaller than the spacing between two adjacent longitudinal beams 2112. Specifically, the two ends of the longitudinal beam 2112 and the frame 2111 can be welded, glued, concave-convex matched or snap-fitted. The present application preferably adopts welding between the two ends of the longitudinal beam 2112 and the frame 2111 to increase the connection strength.

[0052] It should be emphasized that in the frame 2111, the crossbeam 2113 connecting the longitudinal beam 2112 and the frame 2111, and the two adjacent longitudinal beams 2112 can be a solid beam or a square tube beam, which can be set according to the specific situation. The crossbeam 2113 in the present application provides a mounting point for the bottom plate 212, and a battery module 220 is suspended above the bottom plate 212. A heat dissipation channel 213 is formed between two adjacent bottom plates 212, so that the coolant flows to the heat dissipation channel 213 after passing through the first gap 230 between the battery modules 220, and flows from the heat dissipation channel 213 to the battery pack 200 of the next layer.

[0053] In order for the coolant to flow quickly to the battery pack 200 of the next layer, in a preferred embodiment, each first gap 230 in each battery pack 200 is directly opposite to a heat dissipation channel 213. It should be noted that in each battery pack 200, the number of heat dissipation channels 213 is consistent with the number of first gaps 230, and the number of heat dissipation channels 213 opened on the tray 210 can be 2, 3, 5, 7, 9 or more. Through the above arrangement, when the coolant flows into the first cavity 110 through the liquid inlet, the coolant flowing vertically downward can quickly flush the largest side of the battery module 220, and flow directly from the first gap 230 to the heat dissipation channel 213 arranged opposite to the first gap 230, and then flow from the heat dissipation channel 213 to the next layer of battery pack 200. The fast-flowing coolant can promptly take away the heat generated on the surface of the battery module 220, thereby improving the heat dissipation efficiency; the coolant flowing rapidly along the vertical direction a can quickly make all battery packs 200 completely in the flowing coolant, so that the working environment temperature of all battery packs 200 in the first cavity 110 is consistent, thereby ensuring the consistency of the working temperature of the battery pack 200.

[0054] In the specific configuration, in each battery pack 200, the length direction of the heat dissipation channel 213 is parallel to the length direction of the corresponding first gap 230. The above configuration is helpful to accelerate the flow of the coolant through the first gap 230 and the heat dissipation channel 213 of this layer to the battery pack 200 of the next layer, and accelerate the speed of the coolant filling the first cavity 110, thereby facilitating the consistent working environment temperature of all battery packs 200 in the first cavity 110, and ensuring the consistency of the working temperature of the battery pack 200.

[0055] It should be noted that the first cavity 110 of the immersion energy storage device 10 has a plurality of battery packs 200 distributed along the vertical direction a. In order for the cooling liquid to quickly cool down each layer of the battery packs 200 and accelerate the cooling liquid to fill the first cavity 110, specifically, along the vertical direction a, the first gap 230 in each layer of the battery pack 200 is arranged opposite to the first gap 230 of the adjacent layer through the heat dissipation channel 213. Through the above arrangement, when the coolant flows into the first cavity 110 through the liquid inlet, the coolant flows vertically downward to the topmost battery pack 200, and simultaneously flushes downward from the largest side of the multiple battery modules 220 of the topmost battery pack 200 to the first gap 230, and flows vertically downward directly from the first gap 230 to the heat dissipation channel 213 arranged opposite to the first gap 230, and then maintains the vertical downward flow state to flow all the way to the bottommost battery pack 200, so that the coolant that flows vertically downward can quickly take away the heat generated on the surface of the battery module 220, and more quickly fill the first cavity 110 with flowing insulating coolant. The battery pack 200 is immersed in the coolant, and all battery modules are in direct contact with the coolant, and the heat generated by themselves can be taken away by the flowing coolant in time, and the operating temperature difference of all battery modules 220 in the first inner cavity is maintained within an ideal range.

[0056] In order to ensure the cooling liquid passing efficiency without affecting the arrangement quantity of the battery modules 220 in the battery pack 200 , specifically, the gap between two adjacent bottom plates 212 ranges from 10 mm to 20 mm.

[0057] In the specific setting, the gap between two adjacent base plates 212 is also the width of the heat dissipation channel 213, so the width of the heat dissipation channel 213 can be any value of 11mm, 12mm, 13.5mm, 15mm, 17mm, 18.5mm, 19mm, and 19.5mm. It should be noted that the width of the heat dissipation channel 213 is not limited to the specific values ​​provided above, and the width of the heat dissipation channel 213 can be other values ​​within the range of 10mm-20mm.

[0058] When the width of the heat dissipation channel 213 is between 10mm and 20mm, on the one hand, the circulation efficiency of the coolant is guaranteed when it flows through the heat dissipation channel 213 to the next layer of battery pack 200, so that the coolant can flow downward quickly in sequence, so that all battery packs 200 are completely in the flowing coolant, so that the working environment temperature of all battery packs 200 in the first cavity 110 is consistent, ensuring the consistency of the working temperature of the battery pack 200; on the other hand, each bottom plate 212 corresponds to a suspended battery module 220. When the gap between two adjacent bottom plates 212 is between 10mm and 20mm, it is ensured that multiple bottom plates 212 can be set on the frame 2111, so that the frame 2111 can carry multiple battery modules 220, thereby improving the integration of the battery pack 200.

[0059] On the contrary, when the width of the heat dissipation channel 213 is less than 10 mm, it affects the rate at which the coolant passes through the heat dissipation channel 213, which is not conducive to the coolant quickly reaching the next layer of battery pack 200, and easily causes excessive temperature difference between the battery packs 200; when the width of the heat dissipation channel 213 is greater than 20 mm, it is not conducive to arranging multiple battery modules 220 on the frame 2111, affecting the concentration of the battery pack 200.

[0060] It should be emphasized that the bottom plate 212 in the present application is set to a rectangle but is not limited to the above rectangle. The bottom plate 212 can be any geometric shape such as a circle, an ellipse, a triangle, a polygon, etc. In order to more conveniently meet the battery module 220 being suspended on the bottom plate 212, the bottom plate 212 can also provide support for the battery module 220. Specifically, the tray 210 also includes an insulating member 214, which is arranged on the side of the bottom plate 212 away from the frame 211, and the insulating member 214 is used to carry the battery module 220 so that the battery module 220 and the bottom plate 212 have a second gap.

[0061] In the specific setting, in order for the bottom plate 212 to safely provide support for the battery module 220, the bottom plate 212 is preferably a metal plate with a certain hardness, and the surface of the bottom plate 212 is sprayed with insulating material. Exemplarily, the bottom plate 212 can be any metal plate such as steel plate, aluminum plate, zinc plate, etc., and the insulating material can be polyvinyl chloride, polyethylene, polypropylene, rubber, hard oxide ceramics and other materials.

[0062] In order to ensure the connection strength of the bottom plate 212, the present application preferably welds the front end and the rear end of the bottom plate 212 to the front tube beam in the frame 2111 and the rear tube beam in the frame 2111 respectively. It should be noted that the connection between the bottom plate 212 and the frame 2111 is not limited to welding, but can also be a variety of methods such as gluing, concave-convex fitting, snap connection or fastener connection.

[0063] In order to ensure the balance of the supporting force of the battery module 220, more specifically, the number of the insulating members 214 is at least two, and the two insulating members 214 are arranged on opposite sides of the bottom plate 212, and a receiving space 215 is formed between the two insulating members 214 and the frame 2111 in the frame 211. The insulating member 214 is used to carry the battery module 220, and the battery module 220 is located above the receiving space 215. Through the above arrangement, the bottom of the battery module 220 is easy to dissipate heat, and the bottom of the battery module 220 is prevented from causing damage to the bottom plate 212. In the specific arrangement, the insulating member 214 is an insulating material with a certain hardness, and the insulating member 214 can be a plastic member, a rubber member, or other insulating member.

[0064] In order to facilitate the fixing of the insulating member 214 to the bottom plate 212, the insulating member 214 can be fixed to the opposite sides of the bottom plate 212 by means of adhesive, fastener connection, etc., to support the battery module 220, avoid direct contact between the battery module 220 and the bottom plate 212, and thus avoid affecting the heat dissipation of the battery module 220. It should be noted that the bottom plate 212 and the insulating member 214 in the present application can also be integrally formed, and the specific integral forming method can be formed by bending the opposite sides of the plate body, and in order to ensure the safety when carrying the battery module 220, the surface of the integrally formed bottom plate 212 is sprayed with insulating material.

[0065] In order to enhance the heat dissipation of the bottom of the battery module 220, specifically, the accommodating space 215 is filled with a heat dissipation structure, which includes a metal part and a first structural adhesive and a second structural adhesive arranged on two opposite surfaces of the metal part. In the specific setting, the first structural adhesive located between the metal part and the bottom plate 212 fixes the metal part to the bottom plate 212, and the first structural adhesive is in full contact with the bottom of the bottom plate 212; the second structural adhesive located between the metal part and the battery module 220 fixes the metal part to the battery module 220, and the second structural adhesive is in full contact with the bottom of the battery module 220, so the battery module 220 and the bottom plate 212 are fixed as a whole through the above heat dissipation structure. It should be noted that the thermal conductivity of the metal part is good, because there are free electrons between metal atoms, and these free electrons can move freely in the metal lattice. When one end of the metal is heated, the free electrons will gain energy and move quickly to the low temperature end, and transfer energy to other electrons and metal ions through collision, thereby realizing rapid heat conduction. The above arrangement facilitates rapid heat transfer from the bottom of the battery module 220 through the first structural adhesive, the metal part and the second structural adhesive, thereby improving the heat dissipation efficiency of the battery module 220. It should be noted that the type of structural adhesive is not limited this time, and any colloid used for connection and heat dissipation effect can be used.

[0066] In order to further improve the heat dissipation of the bottom of the battery module 220, more specifically, the area of ​​the metal part accounts for at least 85% of the area of ​​the accommodation space 215. In specific settings, the specific ratio of the area of ​​the metal part to the area of ​​the accommodation space 215 can be 87%, 89%, 92%, 94%, 96%, 98%, 100% and any value exceeding 85%. Through the above settings, the bottom of the battery module 220 can be quickly transferred to the metal part in the vertical direction, and the heat is quickly dissipated through the metal part, thereby improving the heat dissipation efficiency of the battery module 220.

[0067] In order to ensure the heat transfer effect, more specifically, the metal part is copper foil. It should be noted that copper foil is a metal with very good thermal conductivity, and its thermal conductivity coefficient (a physical quantity that measures the thermal conductivity of a material) is about 385401W / (m·K). In the specific setting, in addition to copper foil, the metal part can also be other metal types with good thermal conductivity such as silver and aluminum. Through the above setting, the heat of the battery module 220 can be transferred faster, and the heat of the battery module 220 can be quickly dissipated.

[0068] In order to achieve lightweight design while ensuring the heat dissipation effect, more specifically, the thickness range of the metal part is 6μm-12μm. In the specific setting, when the metal part is copper foil, the thickness of the copper foil can be 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm and any value between 6μm and 12μm. The above-mentioned immersion energy storage device 10 controls the thickness of the copper foil within the range of 6μm to 12μm, so that heat can penetrate and dissipate more easily, and the heat dissipation effect is better. At the same time, controlling the thickness of the copper foil within the range of 6μm to 12μm can also ensure that the overall thickness of the immersion energy storage device 10 is small, avoiding the introduction of the layer heat dissipation structure to affect the thickness of the immersion energy storage device 10.

[0069] It should be noted that the thickness of the first structural adhesive, the thickness of the metal part and the thickness of the second structural adhesive jointly determine the thickness of the heat dissipation structure. In order to further avoid the introduction of the heat dissipation structure from affecting the thickness of the immersed energy storage device 10, more specifically, the first thickness of the first structural adhesive between the metal part and the bottom plate 212 is 3μm to 10μm. In specific settings, the first thickness can be 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm and any value between 3μm and 10μm. It should be noted that the first thickness of the first structural adhesive is not limited to the above-mentioned value between 3μm and 10μm, and can be determined according to the actual size of the battery module 220.

[0070] Similarly, the second thickness of the second structural adhesive between the metal part and the battery module 220 is also 3μm to 10μm, and the second thickness can be 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm and any value between 3μm and 10μm. It should be noted that the second thickness of the second structural adhesive is not limited to the above-mentioned value between 3μm and 10μm, and can be determined according to the actual size of the battery module 220. The second thickness of the second structural adhesive can be the same as the first thickness of the first structural adhesive.

[0071] In order to conveniently dissipate heat for the battery cells 223 in the battery module 220, more specifically, the battery module 220 includes a battery assembly and a cable tie 221 wrapped around the battery assembly, the battery assembly includes a first end plate 222, a plurality of battery cells 223 and a second end plate 224 arranged in sequence, a third gap 225 is provided between two adjacent battery cells 223, and a foam body is arranged in the third gap 225. Through the above arrangement, when the coolant flows vertically downward to the battery pack 200, part of the coolant simultaneously flushes downward from the largest sides of the multiple battery modules 220 of the battery pack 200 to the first gap 230, and flows vertically downward from the first gap 230 directly to the heat dissipation channel 213 arranged opposite to the first gap 230, and then flows vertically downward from the heat dissipation channel 213 to the lower battery pack 200, and part of the coolant flows into the foam body from the third gap 225 in the battery module 220, thereby fully contacting the surface of the battery cell 223, which can more effectively take away the heat generated by the battery cell 223 and accelerate the heat dissipation effect of the battery module 220.

[0072] In the specific setting, the bottom of the first end plate 222 and the second end plate 224 are slightly higher than the bottom of the battery cell 223, so that the first end plate 222 and the second end plate 224 can make corresponding contact with the front tube beam and the rear tube beam in the frame 2111, and then pass through the mounting hole 2114 through the fastener to detachably connect with the first end plate 222 and the second end plate 224. The fastener can be a bolt, a screw, etc. The present application preferably uses long bolts to fasten the battery module 220 to the frame 211.

[0073] In one embodiment, the bottom of the battery cell 223 in the battery module 220 abuts against the insulating member 214, so that a second gap is provided between the bottom of the battery cell 223 in the battery module 220 and the bottom plate 212 in the frame 211. The second gap is provided with a heat dissipation structure before the battery module 220 is installed, so that the battery module 220 can be fixed on the frame 211 after installation.

[0074] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An immersion energy storage device, characterized in that: The submerged energy storage device comprises a housing and a plurality of battery packs, wherein: The housing has a first cavity, and the housing is also provided with a liquid inlet and a liquid outlet communicated with the first cavity, and the liquid inlet is used to introduce cooling liquid into the first cavity; A plurality of battery packs are stacked in the first cavity along a vertical direction, and the battery pack is located between the liquid inlet and the liquid discharge port. The battery pack includes a tray and a plurality of battery modules spaced apart on the tray, and a first gap is provided between two adjacent battery modules. The tray includes a frame and a bottom plate mounted on the frame, and the battery modules are provided on the bottom plate. There are a plurality of bottom plates, and the plurality of bottom plates are spaced apart, and a heat dissipation channel is formed between two adjacent bottom plates, and the heat dissipation channel is connected to the first gap.

2. The submerged energy storage device according to claim 1, characterized in that: In each of the battery packs, each of the first gaps faces one of the heat dissipation channels.

3. The submerged energy storage device according to claim 2, characterized in that: Along the vertical direction, the first gaps in each layer of the battery packs are arranged opposite to the first gaps in an adjacent layer through the heat dissipation channel.

4. The submerged energy storage device according to claim 1, characterized in that: The gap between two adjacent bottom plates ranges from 10 mm to 20 mm.

5. The submerged energy storage device according to claim 1, characterized in that: The tray further includes an insulating member, which is disposed on a side of the bottom plate away from the frame, and is used to support the battery module so that a second gap exists between the battery module and the bottom plate.

6. The submerged energy storage device according to claim 5, characterized in that: The number of the insulating members is at least two. The two insulating members are disposed on two opposite sides of the bottom plate, and a containing space is formed between the two insulating members and the frame.

7. The submerged energy storage device according to claim 6, characterized in that: The accommodating space is filled with a heat dissipation structure, which includes a metal piece and a first structural adhesive and a second structural adhesive arranged on two opposite surfaces of the metal piece.

8. The submerged energy storage device according to claim 7, characterized in that: The area of ​​the metal piece accounts for at least 85% of the area of ​​the accommodating space.

9. The submerged energy storage device according to claim 7, characterized in that: The metal piece is copper foil.

10. The submerged energy storage device according to claim 7, characterized in that: The thickness of the metal piece is in the range of 6 μm to 12 μm.

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