An energy storage cabinet and energy storage equipment

Abstract

This application relates to the field of energy storage equipment technology, and particularly to an energy storage cabinet and energy storage equipment. The energy storage cabinet includes a cabinet, battery modules, and a liquid-cooled module. The battery modules are disposed within the cabinet and include a housing, a first coolant disposed within the housing, and several battery packs, with at least a portion of the battery packs immersed in the first coolant. The liquid-cooled module is disposed within the cabinet and includes a liquid-cooled plate and a second coolant disposed within the liquid-cooled plate, which is located at the bottom of the housing. This application improves the uniformity of heat dissipation of the battery module through a synergistic heat exchange mechanism between the first coolant within the housing and the liquid-cooled plate at the bottom of the housing.

Description

Technical Field

[0001] This application relates to the field of energy storage equipment technology, and in particular to an energy storage cabinet and energy storage equipment. Background Technology

[0002] The function of an energy storage cabinet is to store energy. Because it needs to both release and store energy, it generates significant heat, making its heat dissipation structure crucial. The cabinet houses battery modules. Traditional air cooling or cold-plate liquid cooling methods can lead to uneven heat dissipation and safety hazards. While immersing the battery modules completely in insulating coolant for direct heat exchange provides good cooling, the high cost of the coolant results in higher overall costs and more complex maintenance procedures. Furthermore, the cabinet's sealing against the coolant is often inadequate. Utility Model Content

[0003] In view of the above problems, this application provides an energy storage cabinet and energy storage device that overcomes or at least partially solves the above problems.

[0004] According to one aspect of this application, an energy storage cabinet is provided, including a cabinet, a battery module, and a liquid-cooled module. The battery module is disposed within the cabinet and includes a housing, a first coolant disposed within the housing, and a plurality of battery packs, at least a portion of which is immersed in the first coolant. The liquid-cooled module is disposed within the cabinet and includes a liquid-cooling plate and a second coolant disposed within the liquid-cooling plate, the liquid-cooling plate being disposed at the bottom of the housing.

[0005] In some embodiments, a cell terminal is provided on the top of the battery pack, and the liquid level of the first coolant is greater than or equal to the height of the highest point of the cell terminal.

[0006] In some embodiments, the first coolant is modified silicone oil.

[0007] In some embodiments, the battery module further includes a dielectric constant sensor disposed within the housing.

[0008] In some embodiments, a thermally conductive layer is provided on the surface of the liquid cooling plate facing the battery pack.

[0009] In some embodiments, the liquid cooling module further includes a liquid cooling pipe assembly and a circulation pump, with the liquid cooling plate, liquid cooling pipe assembly and circulation pump connected in sequence.

[0010] In some embodiments, the liquid cooling pipe assembly includes a main liquid inlet pipe, a branch liquid inlet pipe, a main liquid return pipe, and a branch liquid return pipe. The liquid cooling plate is provided with a liquid inlet and a liquid outlet. One end of the main liquid inlet pipe is connected to a circulation pump, and the other end of the main liquid inlet pipe is connected to one end of the branch liquid inlet pipe. The other end of the branch liquid inlet pipe is connected to the liquid inlet. One end of the main liquid return pipe is connected to the circulation pump, and the other end of the main liquid return pipe is connected to one end of the branch liquid return pipe. The other end of the branch liquid return pipe is connected to the liquid outlet.

[0011] In some embodiments, the energy storage cabinet further includes a controller, and the battery module further includes several temperature sensors. The controller, the circulation pump, and the several temperature sensors are electrically connected. The temperature sensors are disposed on the battery pack to monitor the temperature of the battery pack. When the maximum temperature difference between the several battery packs is greater than a preset threshold, the controller controls the circulation pump to start to drive the second coolant in the liquid cooling plate to circulate.

[0012] In some embodiments, the number of battery modules is at least two. In one battery module, the housing is provided with a first flange interface, which is electrically connected to a plurality of battery packs. The energy storage cabinet also includes cables, both ends of which are provided with second flange interfaces. The second flange interface at one end of the cable can be connected to the first flange interface of one battery module, and the second flange interface at the other end of the cable can be connected to the first flange interface of another battery module, so that the battery packs of the two battery modules are electrically connected.

[0013] According to one aspect of this application, an energy storage device is provided, including the energy storage cabinet described above.

[0014] The beneficial effects of this application are as follows: Unlike existing technologies, this application provides an energy storage cabinet including a cabinet, battery modules, and a liquid-cooled module. The battery modules are housed within the cabinet and include a housing, a first coolant disposed within the housing, and several battery packs. At least a portion of the battery packs is immersed in the first coolant, which dissipates heat and cools the battery packs. The liquid-cooled module is also housed within the cabinet and includes a liquid-cooling plate and a second coolant disposed within the liquid-cooling plate. The liquid-cooling plate is located at the bottom of the housing, and the second coolant within the liquid-cooling plate dissipates heat and cools the bottom of the battery packs. This application improves the uniformity of heat dissipation for the battery modules through a collaborative heat exchange mechanism between the first coolant within the housing and the liquid-cooling plate at the bottom of the housing. Furthermore, the proportion of the first coolant within the housing is lower than in solutions where the battery modules are completely immersed in insulating coolant, reducing costs and simplifying maintenance. The housing structure is also simpler, and compared to the sealed design of energy storage cabinets, the housing provides a better sealing effect. Attached Figure Description To more clearly illustrate the technical solution of this application, the drawings used in this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the energy storage cabinet with the cabinet door open according to an embodiment of this application; Figure 2This is a schematic diagram of the battery module and liquid cooling plate provided in the embodiments of this application; Figure 3 This is a cross-sectional view of the battery module and liquid cooling plate provided in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the battery module and liquid cooling module provided in the embodiments of this application; Figure 5 This is a schematic diagram of the battery module and liquid cooling module from another perspective of the embodiments of this application; Figure 6 This is a schematic diagram of the structure of the liquid cooling plate provided in the embodiment of this application; Figure 7 This is a schematic diagram of the cable structure provided in the embodiments of this application.

[0016] The reference numerals in the detailed embodiments are as follows: 100. Energy storage cabinet; 1. Cabinet; 11. Cabinet body; 111. Battery compartment; 112. Electrical compartment; 12. Cabinet door; 13. Partition; 2. Battery module; 21. Housing; 211. First flange interface; 22. Battery pack; 221. Cell terminal; 23. First coolant; 24. Dielectric constant sensor; 25. Temperature sensor; 3. Liquid cooling module; 31. Liquid cooling plate; 311. Liquid inlet; 312. Liquid outlet; 313. Liquid channel; 314. Thermal conductive layer; 32. Liquid cooling pipe assembly; 321. Main liquid inlet pipe; 322. Branch liquid inlet pipe; 323. Main liquid return pipe; 324. Branch liquid return pipe; 33. Circulation pump; 4. Electrical module; 6. Cable; 61. Second flange interface. Detailed Implementation

[0017] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0019] The energy storage cabinet contains battery modules. Traditional air cooling or cold plate liquid cooling can cause uneven heat dissipation, leading to safety hazards. While direct heat exchange by completely immersing the battery modules in insulating coolant can achieve good heat dissipation, the high cost of coolant results in higher overall costs and more complex operation and maintenance processes. Furthermore, the energy storage cabinet has poor sealing performance for the coolant.

[0020] This application improves the uniformity of heat dissipation of the battery module by using a heat exchange mechanism of the first coolant inside the housing and the liquid cooling plate at the bottom of the housing. Compared with the solution of completely immersing the battery module in insulating coolant, the proportion of the first coolant inside the housing in this application is not high, which can reduce costs and maintenance processes. In addition, the structure of the housing is simple, and compared with the sealed setting of the energy storage cabinet, the housing can be set with a better sealing effect.

[0021] To facilitate readers' understanding of the concept of this utility model, the specific structure of the energy storage cabinet is described below: Please see Figure 1-3 The energy storage cabinet 100 includes a cabinet 1, a battery module 2, and a liquid cooling module 3. The battery module 2 is disposed within the cabinet 1 and includes a housing 21, a first coolant 23 disposed within the housing 21, and several battery packs 22. At least a portion of the battery packs 22 is immersed in the first coolant 23, which dissipates heat and cools the battery packs 22. The liquid cooling module 3 is disposed within the cabinet 1 and includes a liquid cooling plate 31 and a second coolant disposed within the liquid cooling plate 31. The liquid cooling plate 31 is disposed at the bottom of the housing 21, and the second coolant within the liquid cooling plate 31 dissipates heat and cools the bottom of the battery packs 22. This application improves the uniformity of heat dissipation of the battery module 2 by using a heat exchange mechanism of the first coolant 23 inside the housing 21 and the liquid cooling plate 31 at the bottom of the housing 21. Compared with the solution of completely immersing the battery module 2 in insulating coolant, the proportion of the first coolant 23 inside the housing 21 in this application is not high, which can reduce costs and maintenance process. In addition, the structure of the housing 21 is simple, and compared with the sealing setting of the energy storage cabinet 100, the housing 21 can be better sealed.

[0022] In some embodiments, the energy storage cabinet 100 includes an electrical module 4, which includes a high-voltage component (not shown) and an energy storage converter (not shown). The high-voltage component, the energy storage converter, and the battery module 2 are electrically connected. The battery module 2 is used to provide electrical energy. The high-voltage component is used to realize the transmission, distribution, and protection of high-voltage electrical energy. The energy storage converter is used to realize the bidirectional conversion between DC and AC electrical energy.

[0023] In some embodiments, a partition 13 is provided inside the cabinet 1, which divides the space inside the cabinet 1 into a battery compartment 111 and an electrical compartment 112. The battery module 2 is disposed in the battery compartment 111, and the electrical module 4 is disposed in the electrical compartment 112. This separation of the electrical module 4 and the battery module 2 can reduce the possibility of the electrical module 4 transferring heat and fire risk to the battery module 2.

[0024] In some embodiments, the cabinet 1 includes a cabinet body 11 and a cabinet door 12. The battery compartment 111 and the electrical compartment 112 are located in the cabinet body 11. The cabinet door 12 is rotatably disposed in the cabinet body 11 to open and close the battery compartment 111 and the electrical compartment 112. The edge of the cabinet door 12 is provided with a double-layer sealing ring (not shown) to improve the sealing effect between the cabinet door 12 and the cabinet body 11.

[0025] In some embodiments, a cell terminal post 221 is provided on the top of the battery pack 22, and the liquid level of the first coolant 23 is greater than or equal to the height of the highest point of the cell terminal post 221, which is beneficial for the entire battery pack 22 to be submerged in the first coolant 23, thereby improving the heat dissipation effect of the battery pack 22.

[0026] In some embodiments, the first coolant 23 is a modified silicone oil. The modified silicone oil has high insulation, low viscosity and fluidity, and high temperature stability, which is beneficial to improving the insulation of the first coolant 23, reducing the viscosity and fluidity of the first coolant 23, and improving the high temperature stability of the first coolant 23.

[0027] In some embodiments, the boiling point of the first coolant 23 is ≥180°C, which can increase the boiling temperature of the first coolant 23, so that the first coolant 23 remains liquid when the surface temperature of the battery pack 22 reaches a high temperature (e.g., 150°C), thus avoiding heat dissipation interruption or equipment damage caused by the boiling of the first coolant 23.

[0028] In some embodiments, the housing 21 is sealed to reduce the possibility of the first coolant 23 leaking out of the housing 21.

[0029] In some embodiments, the battery module 2 further includes a dielectric constant sensor 24 disposed within the housing 21, which can monitor the insulation degradation of the first coolant 23. The dielectric constant sensor 24 can be of the type FLUCONEPSILON+, RDC330A oil dielectric constant sensor 24, or FWD series online dielectric constant sensor 24.

[0030] In some embodiments, a thermally conductive layer 314 is provided on the surface of the liquid cooling plate 31 facing the battery pack 22, which facilitates full contact between the liquid cooling plate 31 and the bottom of the housing 21, and improves the heat conduction of the battery pack 22 to the liquid cooling plate 31, thereby enhancing the heat dissipation effect. The thermally conductive layer 314 can be a thermally conductive silicone grease layer, which can enhance the thermal conduction efficiency between the liquid cooling plate 31 and the bottom of the housing 21.

[0031] In some embodiments, please refer to Figure 4-5 The liquid cooling module 3 also includes a liquid cooling pipe assembly 32 and a circulation pump 33. The liquid cooling plate 31, the liquid cooling pipe assembly 32 and the circulation pump 33 are connected in sequence to form a circulation channel for the second coolant. The second coolant can circulate between the circulation pump 33, the liquid cooling pipe assembly 32 and the cooling plate. The liquid cooling pipe assembly 32 is used to connect the circulation pump 33 and the liquid cooling plate 31. The circulation pump 33 can regulate the flow rate of the second coolant, thereby regulating the heat dissipation effect of the cooling plate.

[0032] In some embodiments, the liquid cooling pipe assembly 32 includes a main liquid inlet pipe 321, a branch liquid inlet pipe 322, a main liquid return pipe 323, and a branch liquid return pipe 324. The liquid cooling plate 31 is provided with a liquid inlet 311 and a liquid outlet 312. One end of the main liquid inlet pipe 321 is connected to the circulation pump 33, and the other end of the main liquid inlet pipe 321 is connected to one end of the branch liquid inlet pipe 322. The other end of the branch liquid inlet pipe 322 is connected to the liquid inlet 311. One end of the main liquid return pipe 323 is connected to the circulation pump 33, and the other end of the main liquid return pipe 323 is connected to one end of the branch liquid return pipe 324. The other end of the branch liquid return pipe 324 is connected to the liquid outlet 312. In this way, the second coolant can flow from the circulation pump 33 into the liquid cooling plate 31 through the main inlet pipe 321, the branch inlet pipe 322 and the inlet 311 in sequence, and the second coolant can flow out of the liquid cooling plate 31 through the outlet 312, the branch return pipe 324 and the main return pipe 323 in sequence, thereby realizing the circulation of the second coolant between the circulation pump 33, the liquid cooling pipe assembly 32 and the cooling plate.

[0033] In some embodiments, there are multiple battery modules 2, liquid cooling plates 31, branch inlet pipes 322 and branch return pipes 324. One liquid cooling plate 31 is disposed at the bottom of the housing 21 of a battery membrane assembly. One end of the multiple branch inlet pipes 322 is connected to the main inlet pipe 321, and the other end of the branch inlet pipe 322 is connected to the inlet 311 of a liquid cooling plate 31. One end of the multiple branch return pipes 324 is connected to the main return pipe 323, and the other end of the branch return pipe 324 is connected to the outlet 312 of a liquid cooling plate 31.

[0034] In some embodiments, please refer to Figure 6The liquid cooling plate 31 is provided with a liquid channel 313. One end of the liquid channel 313 is connected to the liquid inlet 311, and the other end of the liquid channel 313 is connected to the liquid outlet 312. The second coolant flows in the liquid channel 313. The liquid channel 313 is S-shaped. The S-shaped liquid channel 313, through its meandering flow channel design, can increase the flow path length of the second coolant in the liquid cooling plate 31 and increase the contact time between the second coolant and the bottom of the housing 21, thereby improving the heat dissipation effect.

[0035] In some embodiments, please refer to Figure 3 The energy storage cabinet 100 also includes a controller (not shown), and the battery module 2 includes several temperature sensors 25. The controller, circulation pump 33, and temperature sensors 25 are electrically connected. The temperature sensors 25 are located on the battery pack 22 to monitor the temperature of the battery pack 22. When the maximum temperature difference between the battery packs 22 exceeds a preset threshold, the controller controls the circulation pump 33 to start, driving the second coolant in the liquid cooling plate 31 to circulate. Thus, when the maximum temperature difference between the battery packs 22 is less than the preset threshold, the battery module 2 can achieve immersion cooling using only the first coolant 23. When the maximum temperature difference between the battery packs 22 exceeds the preset threshold, the bottom circulation cooling of the liquid cooling plate 31 is activated, combined with immersion cooling using the first coolant 23. This improves heat dissipation while reducing operating power consumption. The controller can be a YH8002-S2 frequency converter, an AT-CSE100 energy-saving controller, or a Grundfos controller, etc.

[0036] In some embodiments, the energy storage cabinet 100 further includes an indicator (not shown). The controller is electrically connected to the dielectric constant sensor 24 and the indicator. The controller can receive the electrical signal from the dielectric constant sensor 24. When the insulation value of the first coolant 23 monitored by the dielectric constant sensor 24 is lower than a preset insulation threshold, the controller recognizes the electrical signal from the dielectric constant sensor 24 and controls the indicator to issue an indicator signal to remind the user to replace or replenish the first coolant 23. The indicator can be a sound generator or an indicator light.

[0037] In some embodiments, please refer to Figure 1-3 and Figure 7The number of battery modules 2 is at least two. In each battery module 2, the housing 21 is provided with a first flange interface 211, which is electrically connected to several battery packs 22. The energy storage cabinet 100 also includes a cable 6, both ends of which are provided with a second flange interface 61. The second flange interface 61 at one end of the cable 6 can be connected to the first flange interface 211 of one battery module 2, and the second flange interface 61 at the other end of the cable 6 can be connected to the first flange interface 211 of another battery module 2, so that the battery packs 22 of the two battery modules 2 are electrically connected. In this way, when expanding the capacity of multiple battery modules 2, it is not necessary to disassemble the housing 21 of the battery modules 2 to connect the multiple battery packs 22. This application can connect multiple battery modules 2 through the cooperation of the first flange interface 211 and the second flange interface 61, thereby realizing the connection of the battery packs 22 of multiple battery modules 2 to achieve capacity expansion.

[0038] In some embodiments, the first flange interface 211 and the second flange interface 61 can be a slip-on flange, a welding flange, a socket welding flange, a threaded flange, or a loose flange structure.

[0039] This utility model also provides an embodiment of an energy storage device, which includes the above-mentioned energy storage cabinet 100. The function and structure of the energy storage cabinet 100 can be referred to the above embodiment, and will not be repeated here.

[0040] It should be noted that while the preferred embodiments of this utility model are provided in the specification and accompanying drawings, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this utility model; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this utility model specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. An energy storage cabinet, characterized in that, include: Server rack; A battery module is disposed within the cabinet. The battery module includes a housing, a first coolant disposed within the housing, and a plurality of battery packs. At least a portion of the battery packs is immersed in the first coolant. A liquid cooling module is disposed within the cabinet. The liquid cooling module includes a liquid cooling plate and a second coolant disposed within the liquid cooling plate. The liquid cooling plate is disposed at the bottom of the housing.

2. The energy storage cabinet according to claim 1, characterized in that, The top of the battery pack is provided with cell terminals, and the liquid level of the first coolant is greater than or equal to the height of the highest point of the cell terminals.

3. The energy storage cabinet according to claim 1, characterized in that, The first coolant is modified silicone oil.

4. The energy storage cabinet according to claim 1, characterized in that, The battery module also includes a dielectric constant sensor disposed within the housing.

5. The energy storage cabinet according to claim 1, characterized in that, The liquid cooling plate has a thermally conductive layer on its surface facing the battery pack.

6. The energy storage cabinet according to claim 1, characterized in that, The liquid cooling module also includes a liquid cooling pipe assembly and a circulation pump, with the liquid cooling plate, the liquid cooling pipe assembly and the circulation pump connected in sequence.

7. The energy storage cabinet according to claim 6, characterized in that, The liquid cooling pipe assembly includes a main liquid inlet pipe, a branch liquid inlet pipe, a main liquid return pipe, and a branch liquid return pipe. The liquid cooling plate is provided with a liquid inlet and a liquid outlet. One end of the main liquid inlet pipe is connected to a circulation pump, and the other end of the main liquid inlet pipe is connected to one end of the branch liquid inlet pipe. The other end of the branch liquid inlet pipe is connected to the liquid inlet. One end of the main liquid return pipe is connected to the circulation pump, and the other end of the main liquid return pipe is connected to one end of the branch liquid return pipe. The other end of the branch liquid return pipe is connected to the liquid outlet.

8. The energy storage cabinet according to claim 6, characterized in that, The energy storage cabinet also includes a controller, and the battery module also includes several temperature sensors. The controller, the circulation pump, and the several temperature sensors are electrically connected. The temperature sensors are installed in the battery pack to monitor the temperature of the battery pack. When the maximum temperature difference between the several battery packs is greater than a preset threshold, the controller controls the circulation pump to start, so as to drive the second coolant in the liquid cooling plate to circulate.

9. The energy storage cabinet according to any one of claims 1-8, characterized in that, The number of battery modules is at least two. In one of the battery modules, the housing is provided with a first flange interface, which is electrically connected to the plurality of battery packs. The energy storage cabinet also includes cables, both ends of which are provided with second flange interfaces. The second flange interface at one end of the cable can be connected to the first flange interface of one of the battery modules, and the second flange interface at the other end of the cable can be connected to the first flange interface of another battery module, so that the battery packs of the two battery modules are electrically connected.

10. An energy storage device, characterized in that, Includes the energy storage cabinet as described in any one of claims 1-9.

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