Immersed liquid cooling energy storage PACK box

Abstract

The invention relates to the technical field of energy storage batteries, and provides an immersed liquid cooling energy storage PACK box. The battery compartment is placed by arranging the outer frame, so that the stability of the battery compartment is ensured; the main box body of the battery cabin is formed by bending, so that the forming difficulty of a single stamping part is reduced, and the integral sealing performance is improved by performing aluminum brazing connection on the main box body and the corner fittings; according to the liquid cooling plate, efficient heat management and low-flow-resistance operation are achieved through three-inlet and one-outlet flow channel layout and optimal combination of confluence of three parallel inlet flow channels and one outlet flow channel; the battery cells of the battery module are completely immersed in the insulating cooling liquid, and the insulating cooling liquid adopts mineral oil or fluorinated liquid, so that through the composite cooling design of heat dissipation of the static immersion liquid and the bottom liquid cooling plate, the problem of liquid circulation existing in traditional immersion type cooling is effectively solved, the auxiliary heat conduction function of the immersed insulating cooling liquid is fully exerted, and the service life of the battery module is prolonged. And in cooperation with the liquid cooling plate, the system temperature difference is successfully controlled at an excellent level of 3 DEG C, and the overall heat dissipation efficiency is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage battery, and particularly relates to an immersed liquid-cooled energy storage PACK box. BACKGROUND

[0002] The energy storage PACK box is an energy storage device integrating a battery management system (BMS), a thermal management system, structural components and electrical components by combining a plurality of battery cells in a series-parallel manner. The core function of the energy storage PACK box is to store electrical energy and stably output when needed, and the energy storage PACK box is widely used in power, industrial and commercial and household energy storage scenes. The current traditional air-cooled or indirect liquid-cooled PACK has low heat dissipation efficiency, which easily leads to uneven temperature of the battery pack. The risk of thermal runaway of the battery increases under high energy density, and the existing protection scheme has high cost and complex structure. High-voltage configurations such as 1P52S are prone to performance degradation of the series battery pack due to local overheating. Therefore, it is necessary to solve the above problems. SUMMARY

[0003] Therefore, the present application aims to provide an immersed liquid-cooled energy storage PACK box to solve the problems in the background art.

[0004] To achieve the above purpose, the present application provides an immersed liquid-cooled energy storage PACK box, which comprises an outer frame, a battery cabin is arranged in the outer frame, and a battery module is arranged in the battery cabin. The battery cabin comprises a main cabin body, the main cabin body is bent into a box with an open top through a plate, corner pieces are arranged at four corners of the main cabin body for connection, the top of the main cabin body is sealed by an upper cover, and a liquid cooling plate is arranged at the bottom of the main cabin body. The battery module comprises fifty-two series-connected battery cells, the fifty-two series-connected battery cells are arranged in four columns, the battery cells are connected by laser-welded copper bars, and the main cabin body is filled with insulating cooling liquid, and the battery cells are completely immersed in the insulating cooling liquid. The liquid cooling plate comprises three parallel inlet flow channels, the first ends of the three inlet flow channels are connected together and communicate with an inlet liquid connector, the last ends of the three inlet flow channels are connected together and communicate with an outlet flow channel, the outlet flow channel communicates with an outlet liquid connector, and the outlet liquid connector and the inlet liquid connector extend out of the main cabin body.

[0005] Preferably, the outer frame comprises a bottom bracket arranged at the bottom, an upper frame is arranged at the top of the bottom bracket, the battery cabin is arranged in the upper frame, and the liquid cooling plate is arranged at the top of the bottom bracket.

[0006] Preferably, the main cabin body and the corner pieces are made of high-strength aluminum alloy material, the corner pieces are formed by stamping the plate, and the main cabin body and the corner pieces are welded together by aluminum brazing.

[0007] Preferably, a sealing ring is arranged between the upper cover and the main cabin body.

[0008] Preferably, the three inlet channels are arranged in S-shape and cover the battery module.

[0009] Preferably, the outlet channel is arranged in S-shape together with the three inlet channels to cover the battery module.

[0010] Preferably, the insulating cooling liquid is mineral oil or fluorinated liquid.

[0011] Preferably, the battery module comprises a bottomed module beam, and a group of opposite sides of the top of the module beam are provided with end plates, and the two end plates are connected by a connecting strip, and fifty-two series-connected battery cells are arranged between the top end plates of the module beam and the connecting strip.

[0012] The present application has the following advantages: the battery cabin is placed in the outer frame, ensuring the stability of the battery cabin, and the outer frame ensures the structural strength of the whole battery cabin and protects the battery cabin.

[0013] The main box body of the battery cabin is bent, reducing the forming difficulty of a single stamping part, and then connected with the corner piece through aluminum brazing, which has double advantages compared with the traditional bending argon arc welding process: first, the welding contact area can be increased by more than 40%; second, during high-temperature brazing, liquid solder can fully fill the micro gaps through capillary action, so that the overall sealing performance of the box body is improved by about 50%. The helium mass spectrometry leak detection test shows that the structure can achieve an IP67 level or above sealing standard. Compared with the whole stamping forming process, this combined structure shows stronger engineering adaptability: on the one hand, by adjusting the bending parameters, the size of the box body can be quickly changed to meet the installation requirements of different battery modules; on the other hand, the problem of plate cracking commonly seen in deep stamping process is effectively avoided, especially suitable for processing of aluminum alloy plates with a thickness of more than 3mm. The main cabin body and the corner piece of the present application are made of high-strength aluminum alloy material, which has high strength and can well realize the sealing performance of the battery cabin in cooperation with the sealing ring and the upper cover, ensuring that the internal insulating cooling liquid does not leak, so that the whole body fully meets all requirements of liquid filling, transportation and assembly.

[0014] The liquid cooling plate of the present application adopts a "three-in-one-out" flow channel layout, realizes efficient heat management and low flow resistance operation through the optimized combination of three parallel inlet channels and one outlet channel, reduces the pressure drop of the whole plate by about 35% through the design of shunt pressure stabilization, effectively reduces the pumping power consumption, and reduces the flow rate to 0.2-0.5m / s through the parallel inlet channel structure when the initial temperature of the cooling liquid is low, avoids cold shock and realizes gradual temperature rise, and improves the heat exchange uniformity; as the outlet channel of the high-temperature area, the single outlet design increases the flow rate to 1.2-1.5m / s, increases the heat transfer coefficient by 15-20% through the enhanced turbulent effect, and ensures the heat dissipation efficiency of the high heat load area.

[0015] The battery module of the application is that the battery cell is fully immersed in the insulating cooling liquid, the insulating cooling liquid is mineral oil or fluorinated liquid, so that the liquid circulation problem existing in the traditional immersion cooling is effectively solved through the composite cooling design of static immersion liquid and the heat dissipation of the bottom liquid cooling plate, the auxiliary heat conduction function of the immersion insulating cooling liquid is fully played, the system temperature difference is successfully controlled at the excellent level of 3 DEG C in cooperation with the liquid cooling plate, the overall heat dissipation efficiency is significantly improved, the high heat dissipation characteristics of the immersion cooling are retained, and the potential fluid management problem is overcome. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only the application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0017] Figure 1 is the overall explosion diagram of the application; Figure 2 is the explosion diagram of the battery cabin of the application; Figure 3 is the explosion diagram of the outer frame of the application; Figure 4 is the schematic diagram of the battery module of the application; Figure 5 is the internal schematic diagram of the main cabin body of the application; Figure 6 is the schematic diagram of the liquid cooling plate of the application.

[0018] In the figure, the marks are: 1-outer frame, 2-battery cabin, 3-battery module, 4-main cabin body, 5-corner piece, 6-upper cover, 7-liquid cooling plate, 8-inflow channel, 9-liquid inlet joint, 10-outflow channel, 11-liquid outlet joint, 12-bottom bracket, 13-upper frame, 14-sealing ring, 15-module cross beam, 16-end plate, 17-connection strip, 18-battery cell, 19-copper bar. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the application more clear and obvious, the application will be further described in detail below in combination with specific embodiments.

[0020] It should be noted that the technical terms or scientific terms used in the present application should be understood as the general meaning understood by those skilled in the art to which the present application belongs, unless otherwise defined. The "first", "second" and similar words used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] As shown in Figures 1 to 6 The present embodiment provides an immersed liquid-cooled energy storage PACK box, comprising an outer frame 1, a battery cabin 2 is arranged in the outer frame 1, and a battery module 3 is arranged in the battery cabin 2.

[0022] The outer frame 1 comprises a bottom bracket 12 arranged at the bottom, an upper frame 13 is arranged at the top of the bottom bracket 12, the battery cabin 2 is arranged in the upper frame, and a liquid cooling plate 7 is arranged at the top of the bottom bracket 12. The battery cabin 2 is placed by arranging the outer frame 1, so as to ensure the stability of the battery cabin 2, the outer frame 1 ensures the structural strength of the whole battery cabin 2, and protects the battery cabin 2. The bottom bracket 12 is formed by high-strength stamping plate, precise roller pressing frame and square steel butt welding, which is stable and reliable, has the characteristics of light weight and high bearing, the stamping plate improves the local compression strength by optimizing the rib groove design, and the continuous roller pressing process of the roller pressing frame ensures the size accuracy and consistency of the whole frame, has high modular degree, supports the rapid adaptation of different battery modules, and reduces the production and maintenance cost; The manufacturing method combining stamping and roller pressing not only improves the material utilization rate, but also reduces the weight by more than 20% compared with the traditional casting process, while maintaining excellent rigidity; The surface can be treated for rust prevention, insulation and the like, further prolonging the service life, and is an ideal supporting solution for safe and efficient operation of the energy storage system.

[0023] The battery cabin 2 comprises a main cabin body 4 which is a top-open box formed by bending a plate, and corners of the main cabin body 4 are provided with corner pieces 5 for connection, the top of the main cabin body 4 is sealed by an upper cover 6, a sealing ring 14 is arranged between the upper cover 5 and the main cabin body 4, and the bottom of the main cabin body 4 is provided with a liquid cooling plate 7 which is arranged at the bottom of the outer frame 1; the main cabin body 3 of the battery cabin 2 is formed by bending, which reduces the forming difficulty of a single stamping part, and then is connected by aluminum brazing with the corner pieces 5; the main cabin body 4 and the corner pieces 5 are both made of high-strength aluminum alloy material, and the corner pieces 5 are formed by stamping a plate. Compared with the traditional bending argon arc welding process, the aluminum brazing connection has double advantages: first, the welding contact area can be increased by more than 40%; second, during the high-temperature brazing process, the liquid solder can fully fill the micro gaps through capillary action, so that the overall sealing performance of the box is improved by about 50%. The helium mass spectrometry leak detection test shows that the structure can achieve a sealing standard of IP67 level or above. Compared with the overall stamping forming process, this combined structure shows stronger engineering adaptability: on the one hand, by adjusting the bending parameters, the size of the box can be quickly changed flexibly to meet the installation needs of different battery modules; on the other hand, the problem of plate cracking commonly caused by deep stamping process is effectively avoided, and it is particularly suitable for processing of aluminum alloy plates with a thickness of more than 3 mm. The main cabin body 4 and the corner pieces 5 are both made of high-strength aluminum alloy material, which has high strength and can well realize the sealing performance of the battery cabin together with the sealing ring 14 and the upper cover 6 at the top, so as to ensure that the internal insulating coolant does not leak, and the whole body fully meets all requirements of liquid filling, transportation and assembly.

[0024] The battery module 3 comprises fifty-two series-connected battery cells 18 which are arranged in four columns, the battery cells 18 are connected by laser-welded copper bars 19, the main cabin body 4 is provided with insulating coolant, and the battery cells are completely immersed in the insulating coolant; the insulating coolant is mineral oil or fluorinated liquid; the battery module 3 comprises a module cross beam 15 at the bottom, one group of opposite sides of the top of the module cross beam 15 are provided with end plates 16, the two end plates 16 are connected by a connecting strip 17, and the fifty-two series-connected battery cells 18 are arranged between the end plates 16 and the connecting strip 17 at the top of the module cross beam 15. The battery cells 18 of the battery module 3 are completely immersed in the insulating coolant, and the insulating coolant is mineral oil or fluorinated liquid, so that the problem of liquid circulation existing in the traditional immersion cooling is effectively solved through the composite cooling design of static immersion liquid and the heat dissipation of the bottom liquid cooling plate 7, the auxiliary heat conduction function of the immersion insulating coolant is fully utilized, and the system temperature difference is successfully controlled at an excellent level of 3℃, which significantly improves the overall heat dissipation efficiency, retains the high-efficiency heat dissipation characteristics of immersion cooling, and overcomes the potential fluid management problem.

[0025] The liquid cooling plate 7 comprises three parallel inlet flow channels 8, the first ends of the three inlet flow channels 8 are connected together and communicated with an inlet liquid connector 9, the last ends of the three inlet flow channels 8 are connected together and communicated with an outlet flow channel 10, the outlet flow channel 10 is communicated with an outlet liquid connector 11, the outlet liquid connector 11 and the inlet liquid connector 9 extend out of the main cabin body 4 through the main cabin body 4, and the outlet liquid connector 11 and the inlet liquid connector 9 are provided with sealing glue at the positions penetrating through the main cabin body 4; the three inlet flow channels 8 are all arranged in an S shape and cover the battery module 3. The outlet flow channel 10 is arranged in an S shape and covers the battery module 3 together with the three inlet flow channels 8. The liquid cooling plate 7 realizes efficient heat management and low flow resistance operation through the "three-in-one-out" flow channel layout, the optimized combination of the three parallel inlet flow channels 8 and the outlet flow channel 10, realizes efficient heat management and low flow resistance operation; through the design of shunt pressure stabilization, the pressure drop of the whole plate is reduced by about 35% compared with the traditional series flow channel, effectively reducing the pumping power consumption; when the initial temperature of the cooling liquid is low, the parallel inlet flow channel structure reduces the flow rate to 0.2-0.5m / s, avoids cold shock and realizes gradual temperature rise, and improves heat exchange uniformity; as the outlet flow channel of the high temperature area, the single outlet design makes the flow rate increase to 1.2-1.5m / s, increases the heat exchange coefficient by 15-20% through the enhancement of turbulent effect, and ensures the heat dissipation efficiency of the high heat load area. Under the standard working condition of 5L / min flow rate and 25℃ inlet water temperature: the maximum temperature difference between the modules is only 1.4℃, which meets the requirements of ISO 6469-1:2019 electric vehicle battery thermal management, the system pressure drop is 5.3kPa, which is reduced by 22% compared with similar products, the temperature fluctuation amplitude is <±1℃, and excellent operation stability is shown.

[0026] Those skilled in the art should understand that the above discussion of any embodiment is only exemplary and is not intended to suggest that the scope of the present application is limited to these examples; under the idea of the present application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above. In order to be brief, they are not provided in details. Any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An immersed liquid-cooled energy storage PACK box comprising an outer frame (1), characterized in that, The outer frame (1) is provided with a battery cabin (2) inside, and the battery cabin (2) is provided with a battery module (3) inside. The battery cabin (2) comprises a main cabin body (4), the main cabin body (4) is bent into an open-top box through a plate, the main cabin body (4) is provided with corner pieces (5) at four corners for connection, the top of the main cabin body (4) is sealed by an upper cover (6), and the bottom of the main cabin body (4) is provided with a liquid cooling plate (7) arranged at the bottom of the outer frame (1). The battery module (3) comprises fifty-two series-connected battery cells (18), the fifty-two series-connected battery cells (18) are arranged in four columns, the battery cells (18) are connected through laser-welded copper bars (19), the main cabin body (4) is provided with insulating cooling liquid, and the battery cells are completely immersed in the insulating cooling liquid. The liquid cooling plate (7) comprises three parallel flow-in channels (8), the first ends of the three flow-in channels (8) are connected together and communicated with an inlet connector (9), the last ends of the three flow-in channels (8) are connected together and communicated with a flow-out channel (10), the flow-out channel (10) is communicated with an outlet connector (11), and the outlet connector (11) and the inlet connector (9) extend out of the main cabin body (4).

2. The liquid-immersed energy storage PACK tank of claim 1, wherein, The outer frame (1) comprises a bottom bracket (12) arranged at the bottom, the top of the bottom bracket (12) is provided with an upper frame (13), the battery cabin (2) is arranged in the upper frame, and the liquid cooling plate (7) is arranged at the top of the bottom bracket (12).

3. The liquid-immersed energy storage PACK tank of claim 1, wherein, The main cabin body (4) and the corner pieces (5) are made of high-strength aluminum alloy material, the corner pieces (5) are formed by plate stamping, and the main cabin body (4) and the corner pieces (5) are welded together by aluminum brazing.

4. The liquid-immersed energy storage PACK tank of claim 1, wherein, A sealing ring (14) is arranged between the upper cover (5) and the main cabin body (4).

5. The liquid-immersed energy storage PACK tank of claim 1, wherein, The three flow-in channels (8) are arranged in an S shape and cover the battery module (3).

6. The liquid-immersed energy storage PACK tank of claim 5, wherein, The flow-out channel (10) is arranged in an S shape and covers the battery module (3) together with the three flow-in channels (8).

7. The liquid-immersed energy storage PACK tank of claim 1, wherein, The insulating cooling liquid is mineral oil or fluorinated liquid.

8. The liquid-immersed energy storage PACK tank of claim 1, wherein, The battery module (3) comprises a module cross beam (15) at the bottom, one group of opposite sides of the top of the module cross beam (15) is provided with end plates (16), the two end plates (16) are connected through a connecting strip (17), and the fifty-two series-connected battery cells (18) are arranged between the end plates (16) and the connecting strip (17) at the top of the module cross beam (15).

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