Explosion venting system of energy storage system and energy storage system

Abstract

The utility model discloses an explosion venting system of an energy storage system and the energy storage system, and belongs to the technical field of energy storage. The explosion venting system comprises an electrochemical energy storage unit, the top end or the side end of which is provided with an energy storage unit explosion venting valve; the first end of the explosion venting branch pipeline is communicated with the energy storage unit explosion venting valve of the electrochemical energy storage unit; the first end of the explosion venting confluence pipeline is communicated with the second end of the explosion venting branch pipeline; and the confluence explosion venting valve is mounted at the second end of the explosion venting confluence pipeline. According to the explosion venting system, an explosion venting branch pipeline is arranged at an energy storage unit explosion venting valve at the top end or the side end of an electrochemical energy storage unit, and combustible gas and high-temperature electrolyte sprayed out of the electrochemical energy storage unit are gathered to an explosion venting confluence pipeline through the explosion venting branch pipeline and discharged through a confluence explosion venting valve; the situation that other electrochemical energy storage units are polluted by thermal runaway of the single electrochemical energy storage unit can be effectively avoided, the situation of thermal runaway spreading is reduced, and the safety of the energy storage system is improved.

Description

Technical Field

[0001] The present application belongs to the field of energy storage technology, and in particular relates to an explosion relief system and an energy storage system of an energy storage system. Background Art

[0002] The battery pack used in the energy storage system consists of a box and a cover. The smallest unit module cell of energy storage is arranged in the box. When a cell has thermal runaway, the cell may spray a large amount of flammable gas and high-temperature electrolyte into the battery pack. The sprayed high-temperature electrolyte will spread in the battery pack and contaminate other cells, thereby triggering thermal runaway of more cells and reducing the safety of the energy storage system. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an explosion relief system and an energy storage system for an energy storage system, which can effectively prevent the thermal runaway of a single energy storage unit from contaminating other energy storage units, reduce the spread of thermal runaway, and improve the safety of the energy storage system.

[0004] In a first aspect, the present application provides an explosion relief system for an energy storage system, comprising:

[0005] The electrochemical energy storage unit has an energy storage unit explosion relief valve at its top or side end;

[0006] An explosion relief branch pipeline, a first end of which is in communication with the energy storage unit explosion relief valve of the electrochemical energy storage unit;

[0007] An explosion-relief converging pipe, a first end of which is in communication with a second end of the explosion-relief branch pipe;

[0008] The converging explosion relief valve is installed on the second end of the explosion relief converging pipeline.

[0009] According to the explosion relief system of the energy storage system of the present application, an explosion relief branch pipe is arranged at the energy storage unit explosion relief valve at the top or side end of the electrochemical energy storage unit, and the combustible gas and high-temperature electrolyte sprayed out of the electrochemical energy storage unit are gathered by the explosion relief branch pipe to the explosion relief converging pipe and discharged by the converging explosion relief valve. The discharged combustible gas and high-temperature electrolyte will not contact with other electrochemical energy storage units, which can effectively prevent the thermal runaway of the single electrochemical energy storage unit from contaminating other electrochemical energy storage units, reduce the spread of thermal runaway, and improve the safety of the energy storage system.

[0010] According to one embodiment of the present application, it also includes:

[0011] A fire-fighting pipeline, which is used to transport fire-fighting media and is connected to at least one of the explosion-relief branch pipeline and the explosion-relief confluence pipeline.

[0012] According to one embodiment of the present application, the fire protection pipeline includes a fire protection main pipeline and a fire protection branch pipeline corresponding to the explosion relief branch pipeline;

[0013] Among them, the first end of the fire main pipe is connected to the first end of the fire branch pipe, the second end of the fire branch pipe is connected to the second end of the explosion-proof branch pipe, and the second end of the fire main pipe forms a fire interface.

[0014] According to one embodiment of the present application, it also includes:

[0015] A box assembly defines a first accommodating space, the electrochemical energy storage unit is located in the first accommodating space, the confluence explosion relief valve is arranged in the box assembly, and the box assembly is also provided with a box explosion relief valve, which connects the first accommodating space and the space outside the box assembly.

[0016] According to one embodiment of the present application, it also includes:

[0017] A buffer component is arranged on the explosion-relief branch pipeline at a position corresponding to the explosion-relief valve of the energy storage unit, and the buffer component is located between the explosion-relief branch pipeline and the box cover of the box assembly.

[0018] According to an embodiment of the present application, the box assembly includes a box frame and a box cover, the box cover is covered at an opening of the box frame, and a third sealing member is provided between the opening of the box frame and the box cover.

[0019] According to one embodiment of the present application, the explosion relief branch pipeline is provided with a guide structure, and the guide structure is cooperatively connected with the explosion relief valve of the energy storage unit.

[0020] According to an embodiment of the present application, a first sealing member is provided at a connection between the second end of the explosion-relief converging pipe and the converging explosion-relief valve.

[0021] According to one embodiment of the present application, a second seal is provided at the connection between the explosion relief valve of the energy storage unit and the explosion relief branch pipeline.

[0022] According to one embodiment of the present application, the electrochemical energy storage unit is a square battery cell, the energy storage unit explosion relief valve is located at the top of the square battery cell, and the explosion relief branch pipe is located above the square battery cell.

[0023] According to one embodiment of the present application, the electrochemical energy storage unit is a blade battery cell, the energy storage unit explosion relief valve is located at a side end of the blade battery cell, and the explosion relief branch pipe is located on the side of the blade battery cell.

[0024] In a second aspect, the present application provides an energy storage system, the system comprising:

[0025] At least one explosion relief system of the energy storage system as described in the first aspect above.

[0026] According to the energy storage system of the present application, an explosion-proof branch pipe is provided at the explosion-proof valve of the energy storage unit at the top or side end of the electrochemical energy storage unit, and the combustible gas and high-temperature electrolyte sprayed out of the electrochemical energy storage unit are gathered by the explosion-proof branch pipe to the explosion-proof converging pipe and discharged by the converging explosion-proof valve. The discharged combustible gas and high-temperature electrolyte will not contact with other electrochemical energy storage units, which can effectively prevent the thermal runaway of the single electrochemical energy storage unit from contaminating other electrochemical energy storage units, reduce the spread of thermal runaway, and improve the safety of the energy storage system.

[0027] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 This is one of the overall explosion schematic diagrams of the explosion relief system of the energy storage system provided in the embodiment of the present application;

[0030] Figure 2 This is the second overall explosion schematic diagram of the explosion relief system of the energy storage system provided in the embodiment of the present application;

[0031] Figure 3 It is one of the structural schematic diagrams of the explosion relief system of the energy storage system provided in the embodiment of the present application;

[0032] Figure 4 This is the second structural schematic diagram of the explosion relief system of the energy storage system provided in the embodiment of the present application;

[0033] Figure 5 This is one of the partial explosion schematic diagrams of the explosion relief system of the energy storage system provided in the embodiment of the present application;

[0034] Figure 6 yes Figure 5 A partial enlarged schematic diagram of

[0035] Figure 7 This is the second partial explosion schematic diagram of the explosion relief system of the energy storage system provided in the embodiment of the present application;

[0036] Figure 8 It is one of the top views of the explosion relief system of the energy storage system provided in the embodiment of the present application;

[0037] Fig. 9This is a second top view of the explosion relief system of the energy storage system provided in the embodiment of the present application;

[0038] Fig.10 It is one of the schematic diagrams of the component structure of the explosion relief system of the energy storage system provided in the embodiment of the present application;

[0039] Fig.11 This is the second schematic diagram of the component structure of the explosion relief system of the energy storage system provided in the embodiment of the present application.

[0040] Reference numerals:

[0041] Energy storage module 100, energy storage unit explosion relief valve 111,

[0042] The first accommodation space 201, the converging explosion relief valve 202, the box explosion relief valve 203, the box frame 210, the low-pressure plug-in 211, the high-pressure plug-in 212, the liquid cooling nozzle 213, the box cover 220, the liquid cooling plate 230,

[0043] explosion relief assembly 300, second accommodation space 301, explosion relief confluence pipe 310, explosion relief branch pipe 320, guide structure 321, explosion relief branch installation plate 322, explosion relief branch sealing plate 323, explosion relief branch confluence end 324, explosion relief confluence structure 330,

[0044] Fire fighting pipeline 400, fire fighting main pipeline 410, fire fighting interface 411, fire fighting branch pipeline 420, fire fighting medium input end 421,

[0045] A first seal 510 , a third seal 530 , and a buffer assembly 540 . DETAILED DESCRIPTION

[0046] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0047] Reference below Figure 1-Figure 11 An explosion relief system of an energy storage system according to an embodiment of the present application is described.

[0048] like Figure 1 As shown, the explosion relief system of the energy storage system of the embodiment of the present application includes an electrochemical energy storage unit, an explosion relief branch pipeline 320 , an explosion relief converging pipeline 310 and a converging explosion relief valve 202 .

[0049] Among them, the electrochemical energy storage unit is composed of positive electrode materials, negative electrode materials, electrolyte, diaphragm and shell, etc. The electrochemical energy storage unit can also be called a battery cell.

[0050] In actual implementation, the electrochemical energy storage unit may be a square battery cell, a blade battery cell or other energy storage unit, and the electrochemical energy storage unit in the energy storage system may be a single battery cell or a combination of multiple battery cells.

[0051] A plurality of electrochemical energy storage units may be arranged in a queue or array to form an energy storage module 100 , and an energy storage system may include one or more energy storage modules 100 .

[0052] In this embodiment, an energy storage unit explosion relief valve 111 is provided at the top or side end of the electrochemical energy storage unit. The energy storage unit explosion relief valve 111 can regulate the pressure inside the electrochemical energy storage unit. When thermal runaway occurs in the electrochemical energy storage unit, the generated flammable gas and high-temperature electrolyte are ejected to prevent the electrochemical energy storage unit from exploding due to thermal runaway.

[0053] The explosion relief system is provided with an explosion relief assembly 300 for venting the combustible gas and high-temperature electrolyte ejected during thermal runaway. The explosion relief assembly 300 may include components such as an explosion relief branch pipe 320 , an explosion relief converging pipe 310 , and a converging explosion relief valve 202 .

[0054] In this embodiment, the first end of the explosion-relief branch pipe 320 is connected to the energy storage unit explosion-relief valve 111 of the electrochemical energy storage unit, the first end of the explosion-relief confluence pipe 310 is connected to the second end of the explosion-relief branch pipe 320, and the confluence explosion-relief valve 202 is installed on the second end of the explosion-relief confluence pipe 310.

[0055] In this embodiment, when thermal runaway occurs in the electrochemical energy storage unit, the energy storage unit explosion relief valve 111 disposed at the top or side end sprays combustible gas and electrolyte into the explosion relief branch pipe 320, which are then gathered into the explosion relief confluence pipe 310 and discharged out of the energy storage system through the confluence explosion relief valve 202 of the explosion relief confluence pipe 310.

[0056] Among them, the confluence explosion relief valve 202 can balance the pressure inside the explosion relief branch pipeline 320 and the explosion relief confluence pipeline 310. When the pressure exceeds the set safety value, the confluence explosion relief valve 202 will automatically open and spray out combustible gas and electrolyte to ensure the safety of the energy storage system and avoid affecting other electrochemical energy storage units.

[0057] It can be understood that the explosion-proof confluence pipe 310 and the explosion-proof branch pipe 320 are used to transport combustible gas and high-temperature electrolyte, the explosion-proof confluence pipe 310 and the explosion-proof branch pipe 320 are flame-retardant and heat-insulating, and the explosion-proof confluence pipe 310 and the explosion-proof branch pipe 320 can be made of flame-retardant, heat-insulating, and high-temperature resistant materials, or flame-retardant, heat-insulating, and high-temperature resistant coatings can be sprayed on the inner surface of the conventional engineering plastic pipe.

[0058] In actual implementation, each energy storage module 100 may be provided with a corresponding explosion relief branch pipe 320.

[0059] Take the electrochemical energy storage unit as a square battery cell as an example. Figure 8 As shown, the energy storage system includes four energy storage modules 100 , and a plurality of square cells of each energy storage module 100 are arranged in an array manner, and each energy storage module 100 corresponds to an explosion-relief branch pipe 320 .

[0060] Take the electrochemical energy storage unit as a blade battery as an example. Fig. 9 As shown, the energy storage system has a plurality of blade cells arranged along a certain direction, which are divided into two energy storage modules 100. Each energy storage module 100 corresponds to an explosion-proof branch pipe 320, and the two explosion-proof branch pipes 320 are respectively arranged on both sides of the energy storage system.

[0061] In actual implementation, the explosion-proofing confluence pipe 310 may also include an explosion-proofing confluence structure 330. One end of the tree-branch-like explosion-proofing confluence structure 330 is connected to the first end of the explosion-proofing branch pipe 320. The second ends of each explosion-proofing branch pipe 320 are connected through the tree-branch-like structure. The explosion-proofing confluence pipe 310 gathers combustible gas and high-temperature electrolyte.

[0062] For example, Fig.10 As shown, the four explosion relief branch pipes 320 are connected through the explosion relief converging structure 330 on the explosion relief converging pipe 310, converged to the explosion relief converging pipe 310, and discharged by the converging explosion relief valve 202; Fig.11 As shown, the two explosion-relief branch pipes 320 are connected through the explosion-relief converging structure 330 on the explosion-relief converging pipe 310 , converge to the explosion-relief converging pipe 310 , and are discharged from the converging explosion-relief valve 202 .

[0063] According to the explosion relief system of the energy storage system provided in the embodiment of the present application, an explosion relief branch pipe 320 is provided at the energy storage unit explosion relief valve 111 at the top or side end of the electrochemical energy storage unit, and the combustible gas and high-temperature electrolyte sprayed out of the electrochemical energy storage unit are gathered by the explosion relief branch pipe 320 to the explosion relief converging pipe 310 and discharged by the converging explosion relief valve 202. The discharged combustible gas and high-temperature electrolyte will not contact with other electrochemical energy storage units, which can effectively prevent the thermal runaway of the single electrochemical energy storage unit from contaminating other electrochemical energy storage units, reduce the spread of thermal runaway, and improve the safety of the energy storage system.

[0064] The explosion relief system of the energy storage system in the embodiment of the present application also includes a fire protection design to promptly extinguish and cool down the combustible gas and high-temperature electrolyte discharged from the electrochemical energy storage unit, thereby improving the safety of the energy storage system.

[0065] In some embodiments, the explosion relief system of the energy storage system may further include a fire-fighting pipeline 400 , and the fire-fighting pipeline 400 is used to transport a fire-fighting medium.

[0066] In this embodiment, the fire protection pipe 400 is in communication with at least one of the explosion relief converging pipe 310 and the explosion relief branch pipe 320 .

[0067] In this embodiment, the fire protection pipe 400 is connected to the explosion venting confluence pipe 310 and / or the explosion venting branch pipe 320 to extinguish and cool down the combustible gas and high-temperature electrolyte transported in the explosion venting confluence pipe 310 and the explosion venting branch pipe 320.

[0068] In actual implementation, the fire-fighting medium transported in the fire-fighting pipe 400 may be heptafluoropropane, perfluorohexanone, fine water mist, aerosol, etc.

[0069] In some embodiments, the fire protection pipe 400 is in communication with the explosion relief branch pipe 320 .

[0070] In this embodiment, the fire protection pipeline 400 includes a fire protection main pipeline 410 and fire protection branch pipelines 420 corresponding to the explosion relief branch pipelines 320 one by one.

[0071] Among them, the first end of the fire main pipe 410 is connected to the first end of the fire branch pipe 420, the second end of the fire branch pipe 420 is connected to the second end of the explosion-proof branch pipe 320, and the second end of the fire main pipe 410 forms a fire interface 411.

[0072] For example, Fig.10 As shown, the explosion relief assembly 300 includes four explosion relief branch pipes 320, and the fire protection pipe 400 includes four fire protection branch pipes 420. The second end of the fire protection branch pipe 420 is connected to the second end of the explosion relief branch pipe 320, and the connection position is the fire protection medium input end 421.

[0073] In this embodiment, a fire interface 411 is formed at the second end of the fire main pipe 410, and the fire medium is input into the fire main pipe 410 from the fire interface 411 connected to the external fire system, and distributed to four fire branch pipes 420. The fire medium of the fire branch pipes 420 is input from the fire medium input end 421 to the explosion relief branch pipe 320 for fire extinguishing and cooling.

[0074] In actual implementation, after the flammable gas and high-temperature electrolyte in the explosion-proof branch pipe 320 are extinguished and cooled, they flow from the explosion-proof branch confluence end 324 into the explosion-proof confluence structure 330 and are then output to the outside of the energy storage system through the explosion-proof confluence pipe 310.

[0075] For example, Fig.11 As shown, the explosion relief assembly 300 includes two explosion relief branch pipes 320 , and the fire protection pipe 400 includes two fire protection branch pipes 420 , and the fire protection branch pipes 420 are connected to the explosion relief branch pipes 320 in a one-to-one correspondence.

[0076] In actual implementation, the fire protection interface 411 can be set on the front side of the energy storage system box, the fire protection main pipe 410 and the fire protection branch pipe 420 in the energy storage system are connected, and the fire protection branch pipe 420 is connected to the explosion relief branch pipe 320. When thermal runaway occurs in the electrochemical energy storage unit, the fire is extinguished and cooled by transporting the fire protection medium, and the combustible gas and high-temperature electrolyte are discharged out of the energy storage system through the explosion relief confluence pipe 310 and the confluence explosion relief valve 202.

[0077] like Fig.10 As shown, the explosion-proof branch pipe 320 can be set at the top of the electrochemical energy storage unit, the fire-fighting main pipe 410 is arranged on the side of the electrochemical energy storage unit, and the fire-fighting branch pipe 420 is separated from the rear to transport the fire-fighting medium to the explosion-proof branch pipe 320. The fire-fighting pipe 400 is adjusted in accordance with the setting position of the explosion-proof assembly 300, which can improve the space utilization rate of the energy storage system.

[0078] In some embodiments, the explosion relief system of the energy storage system may further include a box assembly.

[0079] In this embodiment, the box assembly defines a first accommodating space 201, the electrochemical energy storage unit and the energy storage module 100 can be disposed in the box assembly, and the converging explosion relief valve 202 is disposed in the box assembly.

[0080] It is understandable that the energy storage module 100 may include a liquid cooling plate 230 , which is also disposed in the first accommodation space 201 and may be located below the energy storage module 100 . The liquid cooling plate 230 is used to reduce the operating temperature of the electrochemical energy storage unit and the energy storage module 100 .

[0081] In this embodiment, the explosion relief assembly 300 is disposed in the first accommodating space 201 , and the explosion relief assembly 300 defines a second accommodating space 301 . The first accommodating space 201 and the second accommodating space 301 are not connected to each other.

[0082] It should be noted that the second accommodating space 301 defined by the explosion relief assembly 300 is a space for transporting explosion relief materials such as combustible gases and electrolytes. The first accommodating space 201 and the second accommodating space 301 are not interconnected, which can ensure that the explosion relief products of thermal runaway of a single electrochemical energy storage unit will not affect other electrochemical energy storage units.

[0083] In the embodiment of the present application, the explosion relief system of the energy storage system can form two independent closed spaces, wherein the first accommodation space 201 is a closed space formed by the box assembly for placing the energy storage module 100, the explosion relief assembly 300 and other components, and the second accommodation space 301 is a closed space formed by the explosion relief assembly 300 for conveying combustible gas and electrolyte. The converging explosion relief valve 202 can be opened autonomously when thermal runaway occurs in the electrochemical energy storage unit, connecting the second accommodation space 301 with the outside world. When thermal runaway occurs in the electrochemical energy storage unit, the mixed gas ejected from the single electrochemical energy storage unit is discharged in a directionally manner through the second accommodation space 301 of the explosion relief assembly 300, effectively preventing the ejected matter of the single electrochemical energy storage unit from contaminating other electrochemical energy storage units, avoiding the spread of thermal runaway, and improving the safety performance of the energy storage system.

[0084] In this embodiment, the first accommodating space 201 and the second accommodating space 301 are relatively sealed and isolated, which can effectively prevent the thermal runaway products from entering the first accommodating space 201 and effectively suppress the spread of thermal runaway.

[0085] It can be understood that the space of the explosion-proof assembly 300 is the second accommodating space 301, and the first accommodating space 201 defined by the box assembly is used to accommodate components such as the energy storage module 100 and the explosion-proof assembly 300. The first accommodating space 201 and the second accommodating space 301 are not connected to each other, and the second accommodating space 301 can be a closed space located inside the first accommodating space 201.

[0086] In some embodiments, the box assembly is further provided with a box explosion relief valve 203, and the box explosion relief valve 203 is connected to the first accommodating space 201 and the space outside the box assembly.

[0087] In this embodiment, the box explosion relief valve 203 can regulate the pressure inside the first accommodating space 201. When the pressure inside the first accommodating space 201 exceeds a set safety value, the box explosion relief valve 203 can open automatically.

[0088] In actual implementation, the box explosion relief valve 203 can balance the pressure difference between the inside and outside of the box. When the second storage space 301 fails to seal or components are damaged, the electrochemical energy storage unit thermal runaway spreads to the first storage space 201, and the box explosion relief valve 203 effectively vents the explosion.

[0089] It is understandable that the second accommodating space 301 is equipped with a confluence explosion relief valve 202, and the first accommodating space 201 is equipped with a box explosion relief valve 203. The two independent spaces are respectively equipped with corresponding explosion relief valves, which can provide dual explosion relief protection for the energy storage system and improve the safety of the energy storage system.

[0090] In some embodiments, the electrochemical energy storage unit is provided with an energy storage unit explosion relief valve 111, and a guide structure 321 is provided at the connection between the energy storage unit explosion relief valve 111 and the explosion relief branch pipeline 320, and the guide structure 321 and the energy storage unit explosion relief valve 111 are cooperatively connected.

[0091] The guide structure 321 is a structure for draining the combustible gas and high-temperature electrolyte discharged from the energy storage unit explosion relief valve 111. The guide structure 321 is cooperatively connected with the energy storage unit explosion relief valve 111. When the energy storage unit explosion relief valve 111 is opened, the guide structure 321 can guide the discharged combustible gas and high-temperature electrolyte to flow in the explosion relief branch pipe 320.

[0092] It should be noted that the guide structure 321 and the energy storage unit explosion relief valve 111 are connected in coordination, which can also ensure the sealing between the electrochemical energy storage unit and the explosion relief branch pipe 320, and prevent the combustible gas and high-temperature electrolyte discharged from the energy storage unit explosion relief valve 111 from flowing into the first accommodating space 201 or other locations of the box assembly, thereby avoiding affecting other electrochemical energy storage units.

[0093] In actual implementation, the guide structure 321 can be a guide protrusion, a guide groove or other structures.

[0094] For example, Figure 5 As shown, the explosion-relief branch pipeline 320 may include an explosion-relief branch mounting plate 322 and an explosion-relief branch sealing plate 323 . The explosion-relief branch mounting plate 322 is installed on the energy storage module 100 . The explosion-relief branch sealing plate 323 and the explosion-relief branch mounting plate 322 are installed in a covering manner. The guide structure 321 is arranged on the explosion-relief branch mounting plate 322 .

[0095] like Figure 6 As shown, the guide structure 321 is a guide protrusion, and each explosion-relief branch pipe 320 is provided with a corresponding guide protrusion on the upper side of the corresponding energy storage unit explosion-relief valve 111, and the guide protrusion is connected with the energy storage unit explosion-relief valve 111. When the energy storage unit explosion-relief valve 111 is opened, the guide protrusion can guide the combustible gas and high-temperature electrolyte discharged from the energy storage unit explosion-relief valve 111 to flow in the second accommodating space 301.

[0096] In some embodiments, the explosion relief system of the energy storage system further includes a buffer assembly 540 .

[0097] The buffer component 540 is a component used to mitigate the impact force during thermal runaway.

[0098] In this embodiment, the buffer assembly 540 is disposed on the explosion relief branch pipe 320 at a position corresponding to the energy storage unit explosion relief valve 111 , and the buffer assembly 540 is located between the explosion relief branch pipe 320 and the box cover 220 of the box assembly.

[0099] It is understandable that when the electrochemical energy storage unit experiences thermal runaway, the energy storage unit explosion relief valve 111 sprays out combustible gas and high-temperature electrolyte, which will generate a certain impact force at the moment of eruption. The buffer assembly 540 arranged between the explosion relief branch pipe 320 and the box cover 220 can alleviate the impact force of the eruption, prevent the explosion relief branch pipe 320 from being damaged due to impact, and avoid destroying the sealing between the first accommodating space 201 and the second accommodating space 301.

[0100] In actual implementation, the buffer component 540 can be a component such as foam, rubber, or plastic.

[0101] It should be noted that the energy storage system includes two relatively independent closed spaces. The first accommodating space 201 and the second accommodating space 301 are connected to the external space of the energy storage system through the explosion-relief valves on the box assembly respectively. A sealing structure can be provided to ensure the sealing of the first accommodating space 201 and the second accommodating space 301, thereby improving the safety of the energy storage system and the explosion-relief system.

[0102] The sealing structure of the explosion relief system of the energy storage system is introduced in detail below.

[0103] In some embodiments, a first sealing member 510 is provided at the connection between the second end of the explosion relief converging pipe 310 and the converging explosion relief valve 202 .

[0104] It can be understood that the first box explosion-relief opening formed at the second end of the explosion-relief confluence pipe 310 is an opening connecting the second accommodating space 301 with the outside, or an opening formed on the box assembly. By providing a first sealing member 510 at the connection between the second end of the explosion-relief confluence pipe 310 and the confluence explosion-relief valve 202, the sealing between the second accommodating space 301 and the first accommodating space 201 can be ensured.

[0105] In actual implementation, the first sealing member 510 may be a sealing structure member such as a sealing ring or a sealing gasket.

[0106] For example, Figure 7 As shown, the first sealing member 510 is a sealing ring, and the first sealing member 510 is disposed at the connection between the second end of the explosion relief converging pipe 310 and the converging explosion relief valve 202 to ensure the sealing performance at the explosion relief port of the first box.

[0107] In some embodiments, a second seal is provided at the connection between the energy storage unit explosion relief valve 111 and the explosion relief branch pipeline 320 .

[0108] In this embodiment, the second seal is a sealing structure that ensures the sealing of the connection between the energy storage unit explosion relief valve 111 and the explosion relief branch pipe 320. Each energy storage unit explosion relief valve 111 is provided with a second seal to ensure that the combustible gas and high-temperature electrolyte sprayed from the electrochemical energy storage unit enter the explosion relief branch pipe 320 without leakage.

[0109] It is understandable that the second seal is arranged at the connection between the energy storage unit explosion relief valve 111 and the explosion relief branch pipe 320. The connection has a complex structure and can be sealed with sealant, that is, the second seal can be a sealing structural member such as sealant.

[0110] In some embodiments, the box assembly includes a box frame 210 and a box cover 220 . The box cover 220 covers the opening of the box frame 210 . A third sealing member 530 is disposed between the opening of the box frame 210 and the box cover 220 .

[0111] The third sealing member 530 is a sealing structural member for ensuring the sealing between the box frame 210 and the box cover 220 .

[0112] In actual implementation, the third sealing member 530 may be a sealing structure member such as a sealing ring.

[0113] like Figure 2 As shown, the third sealing member 530 is a sealing ring, and the third sealing member 530 is disposed at the connection between the box frame 210 and the box cover 220 to ensure the sealing of the first accommodating space 201 defined by the box assembly.

[0114] It is understandable that the box frame 210 can be provided with low-voltage plug-in 211, high-voltage plug-in 212, liquid cooling nozzle 213 and other structures to provide low-voltage and high-voltage connection interfaces for the battery template in the box frame 210, cooling interfaces for the liquid cooling plate 230, etc.

[0115] In the embodiment of the present application, the first accommodating space 201 and the second accommodating space 301 are sealed by sealing structural parts such as the first seal 510, the second seal and the third seal 530 to ensure that the combustible gas and the high-temperature electrolyte will not enter the first accommodating space 201 when a single electrochemical energy storage unit has thermal runaway. These sealing structural parts can be made of high-temperature resistant flame-retardant materials to prevent the damage of the sealing due to thermal runaway of the electrochemical energy storage unit.

[0116] The explosion relief system of the energy storage system of the embodiment of the present application is specifically described below from two different implementation perspectives.

[0117] 1. The electrochemical energy storage unit is a square battery cell.

[0118] In some embodiments, the energy storage unit explosion relief valve 111 is located at the top of the square battery cell, and the explosion relief branch pipe 320 is located above the square battery cell.

[0119] For example, Figure 3 As shown, there are four energy storage modules 100 in the energy storage system. The energy storage module 100 includes a plurality of square battery cells. Each energy storage module 100 corresponds to an explosion-proof branch pipe 320. The explosion-proof branch pipe 320 is arranged above the square battery cell.

[0120] like Figure 1 As shown, the explosion relief system of the energy storage system includes a box cover 220, an energy storage module 100, an explosion relief assembly 300 and a box assembly. Figure 8 As shown, the explosion relief system of the energy storage system forms two relatively independent closed spaces, the first accommodating space 201 and the second accommodating space 301, by installing the box cover 220, the energy storage module 100, the explosion relief assembly 300 and the box assembly through a sealing structure.

[0121] The second accommodating space 301 is an explosion-proof space when thermal runaway occurs in the electrochemical energy storage unit. The explosion-proof assembly 300 includes a plurality of explosion-proof branch pipes 320. The explosion-proof branch pipes 320 include a plurality of connection ports arranged on the upper side of the explosion-proof port of the electrochemical energy storage unit. An explosion-proof confluence structure 330 is arranged at the end of the energy storage module 100, and leads to the confluence explosion-proof valve 202 through the explosion-proof confluence pipe 310.

[0122] The second accommodating space 301 of the explosion relief assembly 300 is effectively sealed, and the explosion relief branch pipe 320 can be sealed to the upper side of the energy storage module 100 by means of high temperature resistant sealant, exposing each energy storage unit explosion relief valve 111 to the explosion relief branch pipe 320. When thermal runaway occurs in the electrochemical energy storage unit, the energy storage unit explosion relief valve 111 sprays flammable gas and high-temperature electrolyte into the second accommodating space 301, and discharges them through the converging explosion relief valve 202, thereby effectively avoiding contamination of the electrochemical energy storage unit and evading the spread of thermal runaway.

[0123] In this embodiment, the explosion relief system of the energy storage system is also provided with a fire-fighting pipe 400, which delivers fire-fighting medium to the explosion relief branch pipe 320 corresponding to the energy storage module 100 where the electrochemical energy storage unit with thermal runaway is located, accelerates the thermal runaway explosion relief exhaust, takes away the high-temperature mixture generated by the thermal runaway, reduces the temperature and isolates the air at the same time, and effectively avoids the spread and propagation of thermal runaway caused by the thermal runaway of a single electrochemical energy storage unit.

[0124] 2. The electrochemical energy storage unit is a blade battery cell.

[0125] In some embodiments, the energy storage unit explosion relief valve 111 is located at the side end of the blade battery cell, and the explosion relief branch pipe 320 is located at the side of the blade battery cell.

[0126] like Figure 4 As shown, there are two energy storage modules 100 in the energy storage system, and the energy storage module 100 includes a plurality of blade cells. Each energy storage module 100 corresponds to an explosion-proof branch pipe 320, and the explosion-proof branch pipe 320 is arranged on the side of the blade cell, such as Fig.11 As shown, two explosion-relief branch pipes 320 are respectively arranged on both sides of the energy storage system.

[0127] An embodiment of the present application further provides an energy storage system, comprising at least one explosion relief system of the energy storage system as described above.

[0128] In actual implementation, the number of explosion relief systems can be set according to the number, arrangement, connection method, etc. of the electrochemical energy storage units in the energy storage system.

[0129] According to the energy storage system provided in the embodiment of the present application, an explosion-proof branch pipe 320 is provided at the energy storage unit explosion-proof valve 111 at the top or side end of the electrochemical energy storage unit. The explosion-proof branch pipe 320 gathers the combustible gas and high-temperature electrolyte sprayed from the electrochemical energy storage unit to the explosion-proof converging pipe 310 and is discharged by the converging explosion-proof valve 202. The discharged combustible gas and high-temperature electrolyte will not contact other electrochemical energy storage units, which can effectively prevent the thermal runaway of the single electrochemical energy storage unit from contaminating other electrochemical energy storage units, reduce the spread of thermal runaway, and improve the safety of the energy storage system.

[0130] In some embodiments, the energy storage system may further include a fire-fighting pipeline 400 , and the fire-fighting pipeline 400 is used to transport a fire-fighting medium.

[0131] The fire protection pipeline 400 in each explosion relief system includes a fire protection main pipeline 410 and at least one fire protection branch pipeline 420 corresponding to at least one explosion relief branch pipeline 320 .

[0132] Among them, the first end of the fire main pipe 410 is connected to the first end of the fire branch pipe 420, the second end of the fire branch pipe 420 is connected to the second end of the explosion-proof branch pipe 320, and the second end of the fire main pipe 410 forms a fire interface 411.

[0133] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0134] In the description of the present application, it should be understood that the terms "center", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0135] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0136] In the description of the present application, “plurality” means two or more.

[0137] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0138] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0139] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0140] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An explosion relief system for an energy storage system, characterized in that: include: The electrochemical energy storage unit has an energy storage unit explosion relief valve at its top or side end; An explosion relief branch pipeline, a first end of which is in communication with the energy storage unit explosion relief valve of the electrochemical energy storage unit; An explosion-relief converging pipe, a first end of which is in communication with a second end of the explosion-relief branch pipe; The converging explosion relief valve is installed on the second end of the explosion relief converging pipeline.

2. The explosion relief system of the energy storage system according to claim 1, characterized in that: Also includes: A fire-fighting pipeline, which is used to transport fire-fighting media and is connected to at least one of the explosion-relief branch pipeline and the explosion-relief confluence pipeline.

3. The explosion relief system of the energy storage system according to claim 2, characterized in that: The fire protection pipeline includes a fire protection main pipeline and a fire protection branch pipeline corresponding to the explosion relief branch pipeline; Among them, the first end of the fire main pipe is connected to the first end of the fire branch pipe, the second end of the fire branch pipe is connected to the second end of the explosion-proof branch pipe, and the second end of the fire main pipe forms a fire interface.

4. The explosion relief system of the energy storage system according to claim 1, characterized in that: Also includes: A box assembly defines a first accommodating space, the electrochemical energy storage unit is located in the first accommodating space, the confluence explosion relief valve is arranged in the box assembly, and the box assembly is also provided with a box explosion relief valve, which connects the first accommodating space and the space outside the box assembly.

5. The explosion relief system of the energy storage system according to claim 4, characterized in that: Also includes: A buffer component is arranged on the explosion-relief branch pipeline at a position corresponding to the explosion-relief valve of the energy storage unit, and the buffer component is located between the explosion-relief branch pipeline and the box cover of the box assembly.

6. The explosion relief system of the energy storage system according to claim 4, characterized in that: The box assembly comprises a box frame and a box cover, wherein the box cover is engaged with an opening of the box frame, and a third sealing member is arranged between the opening of the box frame and the box cover.

7. The explosion relief system of the energy storage system according to any one of claims 1 to 6, characterized in that: The explosion relief branch pipeline is provided with a guide structure, and the guide structure is cooperatively connected with the explosion relief valve of the energy storage unit.

8. The explosion relief system of the energy storage system according to any one of claims 1 to 6, characterized in that: A first sealing member is provided at a connection between the second end of the explosion relief converging pipe and the converging explosion relief valve.

9. The explosion relief system of the energy storage system according to any one of claims 1 to 6, characterized in that: A second sealing member is provided at the connection between the explosion relief valve of the energy storage unit and the explosion relief branch pipeline.

10. The explosion relief system of the energy storage system according to any one of claims 1 to 6, characterized in that: The electrochemical energy storage unit is a square battery core, the energy storage unit explosion relief valve is located at the top of the square battery core, and the explosion relief branch pipeline is located above the square battery core.

11. The explosion relief system of the energy storage system according to any one of claims 1 to 6, characterized in that: The electrochemical energy storage unit is a blade battery cell, the explosion relief valve of the energy storage unit is located at the side end of the blade battery cell, and the explosion relief branch pipeline is located on the side of the blade battery cell.

12. An energy storage system, characterized in that: include: At least one explosion relief system of the energy storage system as claimed in any one of claims 1 to 11.

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