Liquid-cooled energy storage device and temperature control method of liquid-cooled energy storage device

Abstract

The present application relates to the technical field of energy storage equipment, and in particular to a liquid-cooled energy storage device and a temperature control method for the liquid-cooled energy storage device, including a cabinet and an energy storage module, a liquid cooler and an energy storage module are installed in the cabinet, and a corner bracket is installed on the inner wall of the cabinet, and the number of the corner brackets is several groups and is arranged equidistantly, and the energy storage modules are placed on the corner brackets, and the number of the energy storage modules is several groups and is stacked. The present application sets an overflow bin, an upper overflow hole, a lower overflow hole and a side immersion bin, so that the fluorinated liquid entering the battery box can be effectively dispersed in all directions of the battery pack, thereby performing a full range of heat replacement on the battery pack, ensuring that the heat dissipation and cooling effects of different areas of the same battery pack in the battery box can be similar, thereby avoiding the occurrence of local overheating damage to the battery pack, and the addition of an upper overflow hole and a lower overflow hole can effectively change the flow rate of the fluorinated liquid in the battery and improve the heat replacement efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage equipment, and in particular to a liquid-cooled energy storage device and a temperature control method for the liquid-cooled energy storage device. Background Art

[0002] An energy storage power station is an equipment system that stores, converts and releases cyclic electrical energy through electrochemical cells or electromagnetic energy storage media. In order to place as many energy storage devices as possible in a limited space, the battery packs of energy storage power stations are highly concentrated, which may cause the problem of insufficient heat dissipation. Under the influence of internal and external factors such as battery overcharge, over-discharge, overheating, mechanical collision, and poor temperature consistency, the temperature of the battery pack rises sharply, which can easily cause the battery diaphragm to collapse and internal short circuit, leading to thermal runaway. If thermal runaway propagates within the battery module, it will cause a fire accident in the system. Therefore, it is necessary to set up corresponding heat dissipation devices for the energy storage equipment to assist in cooling, and it is also necessary to monitor the real-time temperature of the energy storage equipment.

[0003] At present, the heat dissipation devices used for energy storage equipment on the market can be divided into two types according to the cooling medium: air cooling and water cooling. Among them, the water cooling method has been gradually promoted because it can completely immerse the battery pack in the coolant, has higher heat exchange efficiency and battery pack protection effect. The working principle of water cooling is: inject coolant into the battery box loaded with battery packs, complete the heat exchange work in the process of the coolant immersing the battery pack, and the heated coolant is discharged from the overflow port of the battery box to the external cooling system. After the coolant is cooled again, it enters the battery pack again to achieve cyclic cooling.

[0004] However, in actual applications, it is found that the bottom of the battery close to the liquid cooling plate in the battery box can achieve a better cooling effect, while the battery area in the center of the same battery pack cannot be effectively controlled in temperature, resulting in different heat dissipation conditions for each battery in the same battery box, creating safety hazards. At the same time, each battery box needs to be connected to a coolant inlet and outlet pipe, which makes the internal pipeline of the energy storage device complicated, thus occupying space and reducing safety. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art to a certain extent, the present application provides a liquid-cooled energy storage device and a temperature control method for the liquid-cooled energy storage device.

[0006] In order to solve the above technical problems, the present application provides the following technical solutions: a liquid-cooled energy storage device, comprising a cabinet and an energy storage module, wherein a liquid cooler and an energy storage module are installed in the cabinet, and an inner wall of the cabinet is provided with a placement angle bracket, wherein the number of the placement angle brackets is several groups and they are arranged in an equidistant manner, and the energy storage modules are placed on the placement angle brackets, wherein the number of the energy storage modules is several groups and they are arranged in a stacked manner;

[0007] The cabinet comprises a liquid inlet main pipe, a liquid outlet main pipe, a medium pipe connector and a shunt branch pipe. The liquid inlet main pipe and the liquid outlet main pipe are fixedly installed on the cabinet. One end of the liquid inlet main pipe and one end of the liquid outlet main pipe are fixedly connected to the connecting end of the liquid cooler. Several groups of shunt branch pipes corresponding to the number of energy storage modules are fixedly installed on the liquid inlet main pipe and the liquid outlet main pipe. The free end of the shunt branch pipe is fixedly installed with a medium pipe connector. The medium pipe connector of the liquid inlet main pipe and the medium pipe connector of the liquid outlet main pipe are both installed with connecting pipes, and the connecting pipes are connected to the corresponding energy storage modules.

[0008] The energy storage module has a built-in temperature sensor, and the energy storage module includes an outer protective shell, a battery box is fixedly installed on the outer protective shell, a bottom plate is fixedly installed on the inner wall of the battery box, the bottom plate is a hollow structure, and the bottom plate and the inner bottom of the outer protective shell form a group of sealed overflow bins, and a liquid inlet connector is installed on the front side wall of the battery box, and the liquid inlet connector is connected to the overflow bin. The inner wall of the battery box is located above the bottom plate and an upper limit frame and a lower limit frame are sequentially installed, and a battery pack is placed on the bottom plate. The upper limit frame and the lower limit frame are sleeved on the outer side of the battery pack and fit the outer side wall of the battery pack, and a plurality of groups of lower overflow holes arranged equidistantly are opened on the upper limit frame;

[0009] The battery box is filled with fluoride liquid;

[0010] The upper limit frame and the lower limit frame form a set of side immersion bins with the outer wall of the battery pack. A liquid outlet connector is installed on the front side of the battery box. The liquid outlet connector is connected to the side immersion bin, and the lower overflow hole is connected to the side immersion bin.

[0011] The connection of the connecting pipe on the medium pipe connector to the liquid outlet connector and the liquid inlet connector on the energy storage module;

[0012] A wiring panel is installed in the middle of the front side wall of the battery box, and a BMS module is arranged on the wiring panel. The BMS module is electrically connected to the battery pack.

[0013] As a preferred technical solution of the present application, the bottom of the cabinet is fixedly equipped with supporting feet, and a high-voltage box is also installed on the cabinet. The high-voltage box is electrically connected to the energy storage module. The cabinet is provided with a battery compartment, a liquid cooling compartment, an inverter compartment and an electrical control compartment. The liquid cooler is installed in the liquid cooling compartment, and the electrical control compartment is provided with an AC side circuit breaker, a lightning protection device, a terminal block and an electric meter.

[0014] As a preferred technical solution of the present application, at least one of the liquid outlet connector and the liquid inlet connector is closed at one end located inside the overflow bin, a drainage hole is provided on the outer wall of the end of the liquid outlet connector located inside the overflow bin, a movable plug is slidably installed in the liquid outlet connector, a return spring is fixedly installed on one side wall of the movable plug, the free end of the return spring is fixedly connected to the inner side wall of the liquid outlet connector, the outer side wall of the movable plug is in contact with the inner side wall of the liquid outlet connector, and the initial state of the movable plug blocks the drainage hole.

[0015] As a preferred technical solution of the present application, the liquid outlet connector and the liquid inlet connector have the same structure.

[0016] As a preferred technical solution of the present application, reinforcing nuts are threadedly installed on the liquid inlet connector and the liquid outlet connector on the front side of the battery box.

[0017] As a preferred technical solution of the present application, a sealing groove is provided on the top of the battery box, a rubber pad is placed in the sealing groove, a sealing cover plate is fixedly installed on the top of the battery box by bolts, a sealing block matching the sealing groove is provided on the bottom of the sealing cover plate, and a pressure plate is fixedly installed on the bottom of the battery box above the battery pack, the pressure plate is in contact with the battery pack and has a hollow structure.

[0018] As a preferred technical solution of the present application, a pad is provided at the intervals between the groups of independent batteries of the battery pack. The pad is an aluminum plate and has a through upper overflow hole connected to the overflow bin.

[0019] As a preferred technical solution of the present application, the outer wall of the pad in contact with the independent battery on the battery pack is provided with sealant, the upper limit frame and the lower limit frame are provided with a sealing gasket on one side wall in contact with the outer wall of the battery pack, and the side immersion bin is independently sealed.

[0020] As a preferred technical solution of the present application, the inner wall of the cabinet is provided with an installation groove for installing the liquid inlet pipe and the liquid outlet pipe. The liquid inlet pipe and the liquid outlet pipe are hidden in the inner wall of the cabinet, and the branch pipe is arranged horizontally with the corner bracket.

[0021] A temperature control method for a liquid-cooled energy storage device, comprising the following steps:

[0022] S1: The temperature sensor on the energy storage module detects the temperature of the fluorinated liquid inside the energy storage module and sends a feedback signal to enter step S2;

[0023] S2: The BMS module receives the feedback signal from the temperature sensor and determines whether the temperature of the fluorinated liquid in the energy storage module is greater than or equal to the set temperature threshold. If the determination result is yes, a cooling signal is sent and the process goes to step S3. If the determination result is no, the detection operation is continued and the process goes to step S2.

[0024] S3: The cooling signal is received by the control module of the device, and the liquid cooler is driven to operate, so that the liquid cooler is in a rapid cooling mode, and the process proceeds to step S4;

[0025] S4: After the liquid cooler executes the rapid cooling mode for a limited period of time, the fluorinated liquid for cooling is input into the energy storage module to replace the fluorinated liquid inside the energy storage module and cool it down. After the cooling is completed, enter step S1.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. In the present application, by setting up an overflow bin, an upper overflow hole, a lower overflow hole and a side immersion bin, the fluorinated liquid entering the battery box can be effectively dispersed in all directions of the battery pack, thereby performing all-round heat replacement on the battery pack, ensuring that the heat dissipation and cooling effects of different areas of the same battery pack in the battery box are similar, thereby avoiding local overheating and damage to the battery pack, and the addition of the upper overflow hole and the lower overflow hole can effectively change the flow rate of the fluorinated liquid in the battery and improve the heat replacement efficiency.

[0028] 2. In the present application, the liquid inlet main pipe and the liquid outlet main pipe are hidden inside the cabinet, so that the space occupied by the liquid inlet main pipe and the liquid outlet main pipe is reduced. At the same time, with the use of branch pipes, the installation of the connecting pipes of the energy storage module is more intuitive, and the situation of complex and difficult to distinguish criss-cross pipes is avoided, thereby improving the convenience of use.

[0029] 3. In the present application, the coordinated use of independent side immersion bins, upper overflow holes and lower overflow holes lengthens the flow path of the fluorinated liquid in the battery box, thereby extending the contact time between the fluorinated liquid and the battery pack, improving the efficiency of heat replacement, and thus increasing the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A three-dimensional schematic diagram of the liquid-cooled energy storage device of the present application;

[0032] Figure 2 It is another three-dimensional schematic diagram of the liquid-cooled energy storage device of the present application;

[0033] Figure 3 A schematic diagram of an exploded view of an energy storage module of the liquid-cooled energy storage device of the present application;

[0034] Figure 4 A schematic diagram of a side cross-sectional view of a battery box of a liquid-cooled energy storage device of the present application;

[0035] Figure 5 A schematic diagram of a three-dimensional diagram of the upper limit frame structure of the liquid-cooled energy storage device of the present application;

[0036] Figure 6 A schematic diagram of a three-dimensional diagram of a pad structure of a liquid-cooled energy storage device of the present application;

[0037] Figure 7 A schematic diagram of a cross-sectional view of a liquid inlet connector of a liquid-cooled energy storage device of the present application;

[0038] Figure 8 A schematic diagram of a cross-sectional view of a battery box of a liquid-cooled energy storage device of the present application;

[0039] Fig. 9 for Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0040] Reference numerals:

[0041] 1-liquid cooler; 2-energy storage module; 3-cabinet; 4-liquid cooling compartment; 5-support leg; 6-liquid inlet pipe; 7-inverter compartment; 8-liquid outlet pipe; 9-electrical control compartment; 10-high-voltage box; 11-placing angle bracket; 12-battery compartment; 13-sealing cover plate; 14-pressing plate; 15-battery pack; 16-upper limit frame; 17-lower limit frame; 18-battery box; 19-liquid outlet connector; 20-wiring panel; 21-outer protective shell; 22-liquid inlet connector; 23-BMS module; 24-pad; 25-bottom plate; 26-overflow compartment; 27-lower overflow hole; 28-upper overflow hole; 29-reinforcement nut; 30-drainage hole; 31-reset spring; 32-movable plug; 33-side immersion compartment; 34-sealing groove; 35-diversion branch pipe; 36-medium pipe connector. DETAILED DESCRIPTION

[0042] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0043] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0046] Example: Figure 1-Figure 9 As shown, a liquid-cooled energy storage device includes a cabinet 3 and an energy storage module 2. A liquid cooler 1 and the energy storage module 2 are installed in the cabinet 3. An inner wall of the cabinet 3 is installed with a placement angle bracket 11. The number of the placement angle brackets 11 is several groups and they are arranged equidistantly. The energy storage modules 2 are placed on the placement angle brackets 11. The number of the energy storage modules 2 is several groups and they are stacked.

[0047] By placing the corner bracket 11 , the contact area between the cabinet 3 and the energy storage module 2 can be minimized, thereby improving the heat dissipation effect of the energy storage module 2 .

[0048] The cabinet 3 includes a liquid inlet main pipe 6, a liquid outlet main pipe 8, a medium pipe connector 36 and a shunt branch pipe 35. The liquid inlet main pipe 6 and the liquid outlet main pipe 8 are fixedly installed on the cabinet 3. One end of the liquid inlet main pipe 6 and one end of the liquid outlet main pipe 8 are fixedly connected to the connecting end of the liquid cooler 1. Several groups of shunt branch pipes 35 corresponding to the energy storage module 2 are fixedly installed on the liquid inlet main pipe 6 and the liquid outlet main pipe 8. The free end of the shunt branch pipe 35 is fixedly installed with a medium pipe connector 36. Connecting pipes are installed on the medium pipe connector 36 of the liquid inlet main pipe 6 and the medium pipe connector 36 of the liquid outlet main pipe 8. The connecting pipes are connected to the corresponding energy storage module 2.

[0049] By connecting the connecting pipe to the medium pipe connector 36 and the energy storage module 2 in sequence, when the energy storage module 2 is cooled, the liquid inlet main pipe 6 is subjected to the output force of the liquid cooler 1, and the fluorinated liquid quickly cooled by the liquid cooler 1 is input into the energy storage module 2, and the heat of the original fluorinated liquid in the energy storage module 2 is replaced. While the quickly cooled fluorinated liquid is input, the original fluorinated liquid in the energy storage module 2 is input into the liquid outlet main pipe 8 through the connecting pipe, waiting for the cooling of the liquid cooler 1.

[0050] The energy storage module 2 has a built-in temperature sensor. The energy storage module 2 includes an outer protective shell 21, on which a battery box 18 is fixedly mounted. A bottom plate 25 is fixedly mounted on the inner side wall of the battery box 18. The bottom plate 25 is a hollow structure. The bottom plate 25 and the inner bottom of the outer protective shell 21 form a group of sealed overflow bins 26. A liquid inlet connector 22 is mounted on the front side wall of the battery box 18. The liquid inlet connector 22 is connected to the overflow bin 26. An upper limit frame 16 and a lower limit frame 17 are sequentially mounted on the inner side wall of the battery box 18 above the bottom plate 25. A battery pack 15 is placed on the bottom plate 25. The upper limit frame 16 and the lower limit frame 17 are sleeved on the outer side of the battery pack 15 and fit against the outer side wall of the battery pack 15. The upper limit frame 16 is provided with a plurality of groups of lower overflow holes 27 arranged equidistantly.

[0051] The temperature sensor detects the temperature of the fluorinated liquid inside the energy storage module 2. When the temperature reaches the set value, the liquid cooler 1 is driven to input the cooled fluorinated liquid into the overflow bin 26 through the connecting pipe and the liquid inlet connector 22. At this time, after the overflow bin 26 is filled, the fluorinated liquid enters the battery box 18 and immerses the battery pack 15, replacing the heat of the original fluorinated liquid. At the same time, the original fluorinated liquid is discharged through the liquid outlet main pipe 8 to wait for the liquid cooler 1 to cool down.

[0052] The battery box 18 is filled with fluorinated liquid.

[0053] The upper limit frame 16 and the lower limit frame 17 form a set of side immersion bins 33 with the outer wall of the battery pack 15. A liquid outlet connector 19 is installed on the front side of the battery box 18. The liquid outlet connector 19 is connected to the side immersion bin 33, and the lower overflow hole 27 is connected to the side immersion bin 33.

[0054] The independent side immersion bin 33 cooperates with the lower overflow hole 27 to form a new flow channel, thereby ensuring the effective replacement of the original fluoride liquid in the battery box 18, so that the fluoride liquid in the battery box 18 can maintain a moving flow state.

[0055] The connection pipe on the medium pipe connector 36 is connected to the liquid outlet connector 19 and the liquid inlet connector 22 on the energy storage module 2 .

[0056] Separate connection heads make replacement easier.

[0057] A wiring panel 20 is installed in the middle of the front side wall of the battery box 18 . A BMS module 23 is arranged on the wiring panel 20 . The BMS module 23 is electrically connected to the battery pack 15 .

[0058] like Figure 1 and Figure 2 As shown, a support leg 5 is fixedly installed at the bottom of the cabinet 3, and a high-voltage box 10 is also installed on the cabinet 3. The high-voltage box 10 is electrically connected to the energy storage module 2. A battery compartment 12, a liquid cooling compartment 4, an inverter compartment 7 and an electrical control compartment 9 are provided on the cabinet 3. The liquid cooler 1 is installed in the liquid cooling compartment 4, and an AC side circuit breaker, a lightning protection device, a terminal block and an electric meter are provided in the electrical control compartment 9.

[0059] like Figure 7 As shown, the liquid outlet connector 19 and the liquid inlet connector 22 have the same structure, and one end of the liquid outlet connector 19 located inside the overflow bin 26 is closed, and a drainage hole 30 is provided on the outer wall of the end of the liquid outlet connector 19 located at the overflow bin 26, and a movable plug 32 is slidably installed in the liquid outlet connector 19, and a return spring 31 is fixedly installed on one side wall of the movable plug 32, and the free end of the return spring 31 is fixedly connected to the inner side wall of the liquid outlet connector 19, and the outer side wall of the movable plug 32 is fitted with the inner side wall of the liquid outlet connector 19, and the movable plug 32 blocks the drainage hole 30 in its initial state, and a reinforcing nut 29 is threadedly installed on the front side of the battery box 18 on the liquid outlet connector 19 and the liquid inlet connector 22.

[0060] When the connecting pipe is connected to the liquid outlet connector 19 and the liquid inlet connector 22, the pipe head of the connecting pipe enters the liquid outlet connector 19 and the liquid inlet connector 22 to squeeze the movable plug 32, so that the drain hole 30 can be released, thereby ensuring the connection between the connecting pipe and the liquid outlet connector 19 and the liquid inlet connector 22. The use of the movable plug 32 can ensure that the internal fluorinated liquid will not leak when the connecting pipe is not installed in the energy storage module 2, and also prevent the entry of dust, which may cause the fluorinated liquid to be impure and thus not insulated.

[0061] like Figure 3 As shown, a sealing groove 34 is opened on the top of the battery box 18, a rubber pad is placed in the sealing groove 34, a sealing cover plate 13 is fixedly installed on the top of the battery box 18 by bolts, a sealing block matching the sealing groove 34 is provided on the bottom of the sealing cover plate 13, and a pressure plate 14 is fixedly installed on the bottom of the battery box 18 above the battery pack 15, the pressure plate 14 is in contact with the battery pack 15 and is a hollow structure.

[0062] The use of the sealing groove 34 and the sealing cover plate 13 can improve the sealing of the battery box 18 , while the use of the pressing plate 14 can ensure the stability of the battery pack 15 inside the battery box 18 .

[0063] like Figure 4 and Figure 6 As shown, a pad 24 is provided at the intervals between the groups of independent batteries of the battery pack 15 . The pad 24 is an aluminum plate. A through-shaped upper overflow hole 28 is opened on the pad 24 . The upper overflow hole 28 is connected to the overflow bin 26 .

[0064] The aluminum plate pad 24 can absorb the heat generated by the operation of the battery pack 15 and, together with the fluorinated liquid flowing in the overflow hole 28, increase the cooling rate.

[0065] like Figure 3 and Figure 8 As shown, the outer wall of the pad 24 in contact with the independent battery on the battery pack 15 is provided with sealant, the upper limit frame 16 and the lower limit frame 17 are provided with a sealing gasket on one side of the outer wall of the battery pack 15, and the side immersion bin 33 is independently sealed.

[0066] The independent side immersion bin 33 can ensure that the flow rate of the fluorinated liquid entering the side immersion bin 33 is changed in cooperation with the lower overflow hole 27 during heat replacement, while also increasing the flow path of the fluorinated liquid and making full use of the heat exchange area.

[0067] like Figure 2 and Fig. 9 As shown, the inner wall of the cabinet 3 is provided with a mounting groove for mounting the liquid inlet pipe 6 and the liquid outlet pipe 8. The liquid inlet pipe 6 and the liquid outlet pipe 8 are hidden in the inner wall of the cabinet 3, and the branch pipe 35 is placed horizontally with the angle bracket 11.

[0068] This ensures that the branch pipe 35 will not affect the energy storage module when the energy storage module 2 is installed, so that there will be no interference between the energy storage module 2 and the branch pipe 35 .

[0069] A temperature control method for a liquid-cooled energy storage device, comprising the following steps:

[0070] S1: The temperature sensor on the energy storage module 2 detects the temperature of the fluorinated liquid inside the energy storage module 2 and sends a feedback signal, and then enters step S2.

[0071] S2: The BMS module 23 receives the feedback signal from the temperature sensor and determines whether the temperature of the fluorinated liquid in the energy storage module 2 is greater than or equal to the set temperature threshold. If the judgment result is yes, a cooling signal is sent and the process goes to step S3. If the judgment result is no, the detection operation is continued and the process goes to step S2.

[0072] S3: The cooling signal is received by the control module of the device, and the liquid cooler 1 is driven to operate, so that the liquid cooler 1 performs a rapid cooling mode, and enters step S4.

[0073] S4: After the liquid cooling machine 1 executes the rapid cooling mode for a limited period of time, the cooling fluorinated liquid is input into the energy storage module 2 to replace the fluorinated liquid inside the energy storage module 2 to cool it down. After the cooling is completed, the process proceeds to step S1.

[0074] Working principle:

[0075] Before use: Install the energy storage module 2 and connect the connecting pipes to the liquid outlet connector 19, the liquid inlet connector 22 and the medium pipe connector 36 in sequence, and connect the liquid inlet main pipe 6 and the liquid outlet main pipe 8 to the liquid cooler 1. At the same time, correctly connect the inverter, AC side circuit breaker, lightning protection device, terminal block, electric meter and high-voltage box 10 in the cabinet 3 in sequence. After the connection is completed, drive the equipment to the energy output state.

[0076] During use: After the energy storage module 2 is operated, the battery pack 15 releases electric energy to generate heat, and the fluorinated liquid in the battery box 18 absorbs the heat first. At this time, the temperature sensor located in the battery box 18 detects the temperature of the fluorinated liquid in real time. When the temperature of the fluorinated liquid reaches or exceeds the threshold, the model is sent to the equipment control terminal, and the control terminal drives the liquid cooler 1 to enter the cooling mode. At the same time, the high-pressure pump in the liquid cooler 1 inputs the cooled fluorinated liquid into each branch pipe 35 through the liquid inlet main pipe 6, and then inputs it into each group of energy storage modules 2.

[0077] At this time, the fluorinated liquid preferentially enters the overflow bin 26 through the liquid inlet connector 22. After the overflow bin 26 is filled, the fluorinated liquid completely covers the bottom of the battery pack 15. At the same time, the fluorinated liquid flows through the upper overflow hole 28 of the pad 24, and while flowing, it displaces the heat absorbed by the pad 24, so that the fluorinated liquid fills the top of the battery pack 15. When the fluorinated liquid enters the top of the battery pack 15, the overflowing fluorinated liquid is squeezed through the lower overflow hole 27 of the upper limit frame 16 and enters the side immersion bin 33, displacing heat on the side of the battery pack 15. The fluorinated liquid entering the side immersion bin 33 can be output to the liquid outlet main pipe 8 through the liquid outlet connector 19, and circulates to the liquid cooler 1 through the liquid outlet main pipe 8 for cooling treatment.

[0078] After use: After the liquid cooler 1 continues to operate and replaces the heat of the energy storage module 2 for a period of time, the real-time temperature sensor feeds back the temperature data in the energy storage module 2. When the internal temperature of the energy storage module 2 is lower than the specified threshold, the liquid cooler 1 is turned off and the circulation of the fluorinated liquid stops.

Claims

1. A liquid-cooled energy storage device, comprising a cabinet (3) and an energy storage module (2), characterized in that: The cabinet (3) is installed with a liquid cooling machine (1) and an energy storage module (2); the inner wall of the cabinet (3) is installed with a placement angle bracket (11); the placement angle brackets (11) are arranged in a plurality of groups and are arranged in an equidistant manner; the energy storage modules (2) are placed on the placement angle brackets (11); the energy storage modules (2) are arranged in a plurality of groups and are arranged in a stacked manner; The cabinet (3) comprises a liquid inlet main pipe (6), a liquid outlet main pipe (8), a medium pipe connector (36) and a branch pipe (35). The liquid inlet main pipe (6) and the liquid outlet main pipe (8) are fixedly mounted on the cabinet (3). One end of the liquid inlet main pipe (6) and one end of the liquid outlet main pipe (8) are both fixedly connected to the connection end of the liquid cooling machine (1). A plurality of groups of branch pipes (35) corresponding to the number of energy storage modules (2) are fixedly mounted on the liquid inlet main pipe (6) and the liquid outlet main pipe (8). A medium pipe connector (36) is fixedly mounted on the free end of the branch pipe (35). A connecting pipe is mounted on the medium pipe connector (36) of the liquid inlet main pipe (6) and the medium pipe connector (36) of the liquid outlet main pipe (8). The connecting pipe is connected to the corresponding energy storage module (2). The energy storage module (2) has a built-in temperature sensor. The energy storage module (2) comprises an outer protective shell (21), a battery box (18) is fixedly mounted on the outer protective shell (21), a bottom plate (25) is fixedly mounted on the inner side wall of the battery box (18), the bottom plate (25) is a hollow structure, and the bottom plate (25) and the inner bottom of the outer protective shell (21) form a group of sealed overflow bins (26), and a liquid inlet connector (22) is mounted on the front side wall of the battery box (18). The head (22) is connected to the overflow bin (26); an upper limit frame (16) and a lower limit frame (17) are sequentially installed on the inner side wall of the battery box (18) located above the bottom plate (25); a battery pack (15) is placed on the bottom plate (25); the upper limit frame (16) and the lower limit frame (17) are sleeved on the outer side of the battery pack (15) and are in contact with the outer side wall of the battery pack (15); and a plurality of groups of lower overflow holes (27) are opened on the upper limit frame (16) and arranged at equal distances; The battery box (18) is filled with fluorinated liquid; The upper limit frame (16) and the lower limit frame (17) form a set of side immersion bins (33) with the outer wall of the battery pack (15); a liquid outlet connector (19) is installed on the front side of the battery box (18); the liquid outlet connector (19) is in communication with the side immersion bin (33); and the lower overflow hole (27) is in communication with the side immersion bin (33); The connection of the connection pipe on the medium pipe connector (36) with the liquid outlet connector (19) and the liquid inlet connector (22) on the energy storage module (2); A wiring panel (20) is installed in the middle of the front side wall of the battery box (18), a BMS module (23) is arranged on the wiring panel (20), and the BMS module (23) is electrically connected to the battery pack (15); A pressing plate (14) is fixedly mounted on the bottom of the battery box (18) above the battery pack (15); the pressing plate (14) is in close contact with the battery pack (15) and is a hollow structure. A backing plate (24) is provided at intervals between the plurality of groups of independent batteries of the battery group (15), a through-shaped upper overflow hole (28) is provided on the backing plate (24), the upper overflow hole (28) is communicated with the overflow bin (26), and the side immersion bin (33) is independently sealed.

2. The liquid-cooled energy storage device according to claim 1, characterized in that: A support foot (5) is fixedly mounted on the bottom of the cabinet (3); a high-voltage box (10) is also mounted on the cabinet (3); the high-voltage box (10) is electrically connected to the energy storage module (2); a battery compartment (12), a liquid cooling compartment (4), an inverter compartment (7) and an electrical control compartment (9) are provided on the cabinet (3); a liquid cooling machine (1) is installed in the liquid cooling compartment (4); and an AC side circuit breaker, a lightning protection device, a terminal block and an electric meter are arranged in the electrical control compartment (9).

3. The liquid-cooled energy storage device according to claim 1, characterized in that: At least one of the liquid outlet connector (19) and the liquid inlet connector (22) has a closed structure at one end located inside the overflow bin (26); a liquid discharge hole (30) is provided on the outer wall of the end of the liquid outlet connector (19) located inside the overflow bin (26); a movable plug (32) is slidably mounted inside the liquid outlet connector (19); a return spring (31) is fixedly mounted on one side wall of the movable plug (32); a free end of the return spring (31) is fixedly connected to the inner side wall of the liquid outlet connector (19); the outer side wall of the movable plug (32) is in contact with the inner side wall of the liquid outlet connector (19); and the movable plug (32) blocks the liquid discharge hole (30) in its initial state.

4. The liquid-cooled energy storage device according to claim 3, characterized in that: The liquid outlet connector (19) and the liquid inlet connector (22) have the same structure.

5. The liquid-cooled energy storage device according to claim 3, characterized in that: A reinforcing nut (29) is threadedly mounted on the liquid inlet connector (22) and the liquid outlet connector (19) on the front side of the battery box (18).

6. The liquid-cooled energy storage device according to claim 1, characterized in that: The top of the battery box (18) is provided with a sealing groove (34), a rubber pad is placed in the sealing groove (34), a sealing cover plate (13) is fixedly mounted on the top of the battery box (18) by means of bolts, and a sealing block matching the sealing groove (34) is provided at the bottom of the sealing cover plate (13).

7. The liquid-cooled energy storage device according to claim 1, characterized in that: The backing plate (24) is an aluminum plate.

8. The liquid-cooled energy storage device according to claim 7, characterized in that: The outer side wall of the pad (24) in contact with the independent battery on the battery pack (15) is provided with a sealant, and the side wall of the upper limit frame (16) and the lower limit frame (17) in contact with the outer side wall of the battery pack (15) is provided with a sealing gasket.

9. The liquid-cooled energy storage device according to claim 1, characterized in that: The inner wall of the cabinet (3) is provided with a mounting groove for mounting a liquid inlet pipe (6) and a liquid outlet pipe (8); the liquid inlet pipe (6) and the liquid outlet pipe (8) are hidden in the inner wall of the cabinet (3); and the branch pipe (35) is arranged horizontally with the placement angle frame (11).

10. A temperature control method for a liquid-cooled energy storage device, applied to the liquid-cooled energy storage device according to any one of claims 1 to 9, characterized in that: Here are the steps: S1: The temperature sensor on the energy storage module (2) detects the temperature of the fluorinated liquid inside the energy storage module (2) and sends a feedback signal, and then proceeds to step S2; S2: The BMS module (23) receives a feedback signal from the temperature sensor and determines whether the temperature of the fluorinated liquid in the energy storage module (2) is greater than or equal to a set temperature threshold. If the determination result is yes, a cooling signal is sent and the process proceeds to step S3. If the determination result is no, the detection process continues and the process proceeds to step S2. S3: The cooling signal is received by the control module of the device, and the liquid cooling machine (1) is driven to operate, so that the liquid cooling machine (1) performs a rapid cooling mode, and then enters step S4; S4: After the liquid cooling machine (1) executes the rapid cooling mode for a limited time period, the cooling fluorinated liquid is input into the energy storage module (2) to replace the fluorinated liquid inside the energy storage module (2) and cool it down, and then the process proceeds to step S1.

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