Energy storage device and energy storage system

Abstract

The embodiment of the utility model relates to the technical field of energy storage systems, and provides an energy storage device and an energy storage system.The energy storage device comprises a plurality of battery modules, a plurality of explosion venting valves, a plurality of sealing pipes and a gas overflow pipe, each battery module comprises a box body and a plurality of single battery cells, the single battery cells are arranged in the box body, and the explosion venting valves are arranged in the box body; a mounting hole is formed in the end part, in the first direction, of the box body, and the explosion venting valve is mounted at the mounting hole; the multiple sealing pipes are vertically arranged on the gas overflow pipe at intervals and communicate with the gas overflow pipe, and the ends, away from the gas overflow pipe, of the sealing pipes communicate with the explosion venting valve. The battery module has the advantages that harmful gas in the box body can be discharged backwards into the gas overflow pipe through the mounting hole of the box body, the explosion venting valve and the sealing pipe, so that the harm to workers is reduced, the explosion risk of the whole battery module is reduced, the fault range of the energy storage device is correspondingly reduced, and the safety of the battery module is improved. And therefore, the safety of the whole energy storage system or workers can be ensured.

Description

Technical Field

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

[0002] Currently, energy storage systems are used to output DC power to provide stable DC power to DC loads.

[0003] In the related art, the energy storage system includes a shell and an energy storage device arranged in the shell, the energy storage device includes multiple battery modules, and the battery module mainly includes a box, a bus, and a plurality of single cells arranged in sequence in the box, and the positive and negative conductive electrodes of the plurality of single cells are connected through the bus at different positions, so that the plurality of single cells are connected in series through the bus.

[0004] However, the inventors realized that in actual use, when at least two single battery cells in the box suddenly experience thermal runaway, a large amount of harmful gas will be generated, causing the air pressure in the box to increase sharply, making the entire battery module at risk of explosion, thereby affecting adjacent battery modules or staff, and further affecting the safety of the energy storage system or staff. Utility Model Content

[0005] One or more embodiments of the present application provide an energy storage device to solve or at least partially alleviate the risk of explosion of the battery module caused by sudden thermal runaway of multiple single cells in the battery module in the related art, which leads to a sharp increase in gas pressure in the box.

[0006] In a first aspect of the present application, an energy storage device is provided, which adopts the following technical solution:

[0007] An energy storage device comprises a plurality of battery modules, a plurality of explosion relief valves, a plurality of sealing tubes and a gas overflow tube, wherein the battery module comprises a box body and a plurality of single cells, the plurality of single cells are arranged in the box body, an installation hole is provided at an end of the box body along a first direction, and the explosion relief valve is installed at the installation hole; the plurality of sealing tubes are arranged on the gas overflow tube in a vertically spaced arrangement, and at least some of the sealing tubes are connected to the gas overflow tube, and one end of the sealing tube away from the gas overflow tube is connected to the explosion relief valve.

[0008] By adopting the above technical scheme, multiple single battery cells are arranged in a box body, so that the multiple single battery cells are safely protected by the box body; an installation hole can be opened at the end of the box body along the first direction, such as the rear end, and the explosion relief valve is installed at the installation hole, so that when the single battery cells in the box body generate a large amount of harmful gas due to sudden thermal runaway, the air pressure in the box body increases. At this time, the explosion relief valve provides a safe pressure release channel, so that the harmful gas with a certain air pressure in the box body can be discharged backwards through the installation hole of the box body and the explosion relief valve, so that the faulty battery module will pass the harmful gas through the corresponding explosion relief valve and the sealing tube to the gas overflow pipe to avoid the harmful gas from spraying to the staff, which not only reduces the possibility of injury to the staff, but also reduces the risk of explosion of the entire battery module, and correspondingly reduces the failure range of the energy storage device including multiple battery modules, effectively avoiding affecting other battery modules or staff adjacent thereto.

[0009] In one embodiment, the energy storage device also includes a first sealing structure, the first sealing structure includes a sealing cover and a first reinforcement structure, the sealing cover is arranged around the explosion-proof valve, and the end of the sealing tube away from the gas overflow pipe is connected to the sealing cover; the first reinforcement structure is arranged on the side wall of the sealing cover away from the box body, the first reinforcement structure includes a first annular reinforcement rib and a plurality of reinforcement plates, the plurality of reinforcement plates are arranged at intervals on the outside of the first annular reinforcement rib, and the reinforcement plate is connected to the first annular reinforcement rib.

[0010] In one embodiment, the first sealing structure further includes a plurality of first fasteners, which are arranged around the mounting hole and penetrate the sealing cover and the box body.

[0011] In one embodiment, the first sealing structure also includes a first sealing ring, which is arranged between the sealing cover and the box body. The first sealing ring is provided with a plurality of positioning holes, and the positioning holes are arranged corresponding to the first fastener. The first fastener is passed through the positioning holes of the sealing cover and the first sealing ring and connected to the box body.

[0012] In one embodiment, the first sealing structure also includes a second sealing ring, the sealing cover is provided with a mounting groove on the side wall away from the box body, one end of the sealing tube away from the gas overflow tube is embedded in the mounting groove, and the second sealing ring is installed in the mounting groove and is sealed and connected to the sealing tube.

[0013] In one embodiment, the energy storage device further includes a second sealing structure, the second sealing structure includes a second fastener and a third sealing ring, the third sealing ring is arranged between the sealing tube and the gas overflow tube, and the sealing tube is connected to the gas overflow tube through the second fastener.

[0014] In one embodiment, the sealing tube includes a pipe joint and a folded edge portion, the pipe joint is bent outward toward one end of the gas overflow pipe to form the folded edge portion, and the folded edge portion is connected to the gas overflow pipe through a plurality of second fasteners arranged in a ring shape.

[0015] In one embodiment, the sealing tube further includes a second reinforcement structure, and two ends of the second reinforcement structure are respectively connected to the outer wall of the pipe joint and the folded edge portion.

[0016] In one of the embodiments, the battery module further includes a radiator and a plurality of heat dissipation brackets arranged in the box body, the plurality of single battery cells and the plurality of heat dissipation brackets are respectively arranged along the first direction, and the single battery cells are mounted on the heat dissipation brackets; the single battery cells include a battery cell body and a conductive electrode, and the conductive electrode is arranged at an end of the battery cell body perpendicular to the first direction; the radiator is arranged on one side of the box body along the vertical direction, and the heat dissipation bracket is in contact with and connected to the radiator.

[0017] In a second aspect of the present application, an energy storage system is provided, which adopts the following technical solution:

[0018] An energy storage system comprises a housing and the energy storage device as described above, wherein the energy storage device is arranged in the housing.

[0019] By adopting the above technical solution, the energy storage system at least has all the technical effects of the energy storage device, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present application, rather than limiting the present application.

[0021] Figure 1 This is one of the schematic diagrams of the explosion structure of the energy storage device according to some embodiments of the present application.

[0022] Figure 2 It is a schematic diagram of a first sealing structure according to some embodiments of the present application.

[0023] Figure 3 Schematic diagram of the explosion structure of a battery module and an explosion relief valve according to some embodiments of the present application.

[0024] Figure 4 for Figure 1 Enlarged view of part A.

[0025] Figure 5 This is the second schematic diagram of the explosion structure of the energy storage device according to some embodiments of the present application.

[0026] Figure 6 for Figure 5 Enlarged view of part B.

[0027] Figure 7 It is a schematic diagram of the partial structure of a battery module according to some embodiments of the present application.

[0028] Figure 8 It is a schematic diagram of a partial explosion structure of a battery module according to some embodiments of the present application.

[0029] In the figure: 1-battery module; 11-box; 111-mounting hole; 12-single battery cell; 121-battery cell body; 122-conductive electrode; 13-heat dissipation bracket; 131-heat dissipation plate; 132-middle frame; 133-thermal conductive structural adhesive; 2-explosion relief valve; 3-sealing tube; 31-pipe joint; 32-folded edge; 33-second reinforcement structure; 4-gas overflow pipe; 5-first sealing structure; 51-sealing cover; 511-mounting groove; 52-first reinforcement structure; 521-first annular reinforcement rib; 522-reinforcement plate; 523-second annular reinforcement rib; 53-first fastener; 54-first sealing ring; 541-positioning hole; 55-second sealing ring; 6-second sealing structure; 61-second fastener; 62-third sealing ring; 7-radiator. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings showing multiple embodiments of the present application. It should be understood that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by ordinary technicians in this field without spending creative work will fall within the scope of protection of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those generally understood by technicians in the technical field of this application; the terms used in the specification of the application are only for the purpose of describing specific implementation methods, and are not intended to limit this application; the terms "including", "comprising", "having", "having", "containing", "including", etc. in the specification and claims of this application and the above-mentioned figure description are open-ended words. Therefore, "including", "comprising", "having" is a method or device with one or more steps or elements, for example, which has one or more steps or elements, but is not limited to having only these one or more elements. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned figures are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, the meaning of "multiple" is two or more.

[0032] In the coordinate system XYZ provided herein, the positive direction of the X-axis represents the right, the reverse direction of the X-axis represents the left, the positive direction of the Y-axis represents the front, the reverse direction of the Y-axis represents the back, the positive direction of the Z-axis represents the top, and the reverse direction of the Z-axis represents the bottom. In the description of the present application, it should be understood that the terms "center", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which 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 cannot be understood as a limitation on the present application.

[0033] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0035] As mentioned above, it should be emphasized that when the term "includes / comprising" is used in this specification, it is used to clearly indicate the presence of the features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps, components or groups of features, integers, steps, components. As used in this application, the singular forms "a", "an" and "the" also include plural forms, unless the context clearly indicates otherwise.

[0036] The words "a" and "an" in this specification may mean one, but may also be consistent with the meaning of "at least one" or "one or more". The term "about" generally means plus or minus 10% of the mentioned value, or more specifically plus or minus 5%. The term "or" used in the claims means "and / or" unless it is clearly stated that it refers to only alternative solutions.

[0037] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0038] Figure 1 It is a schematic diagram of the structure of an energy storage device according to some embodiments of the present application.

[0039] One or more embodiments of the present application disclose a battery module. Figure 1 The energy storage device includes a plurality of battery modules 1, a plurality of explosion relief valves 2, a plurality of sealing tubes 3 and a gas overflow pipe 4. The battery module 1 includes a box body 11 and a plurality of single cells 12. The plurality of single cells 12 are arranged in the box body 11. An installation hole 111 is provided at an end of the box body 11 along a first direction. The explosion relief valve 2 is installed at the installation hole 111. The plurality of sealing tubes 3 are arranged on the gas overflow pipe 4 at intervals in a vertical direction, and at least some of the sealing tubes 3 are connected to the gas overflow pipe 4. One end of the sealing tube 3 away from the gas overflow pipe 4 is connected to the explosion relief valve 2.

[0040] In at least one embodiment, if the entire box body 11 is a rectangular structure, wherein the top or bottom of the box body 11 is a rectangle, then the first direction can be the extension direction of the box body 11, that is, the rear end of the box body 11; if the entire box body 11 is a cube structure, wherein the top or bottom of the box body 11 is a square, then the first direction can be the rear end of the box body 11; therefore, a mounting hole 111 can be opened at the rear end of the box body 11, so that the explosion relief valve 2 can be installed at the mounting hole 111 at the rear end of the box body 11, so that when the battery module 1 is in danger, the harmful gas escapes from the rear of the box body 11 of the battery module 1, and does not directly face the human body, thereby reducing harm to the human body.

[0041] Multiple battery modules 1 can be arranged vertically to form a battery cluster, and a sealing tube 3 can be installed corresponding to the explosion relief valve 2 set at the rear end of the box 11 of each battery module 1, so multiple sealing tubes 3 are also arranged vertically, and the two ends of the sealing tube 3 are respectively connected to the explosion relief valve 2 and the gas overflow pipe 4, so that the harmful gas in the battery module 1 with a fault can be discharged into the gas overflow pipe 4 to avoid diffusion and affect the safety of the staff. The gas overflow pipe 4 can be arranged vertically, where vertical refers to the up and down direction, which can be connected with the gas overflow pipe 4. Figure 1 The Z axis of the mid-coordinate system is parallel.

[0042] Furthermore, a plurality of single cells 12 are disposed in the box 11, so that the box 11 can be used to provide safety protection for the plurality of single cells 12; a mounting hole 111 can be provided at an end of the box 11 along the first direction, such as at the rear end (see Figure 3 As shown), and the explosion relief valve 2 is installed at the installation hole 111, so that when the single battery cell 12 in the box body 11 generates a large amount of harmful gas due to sudden thermal runaway, the air pressure in the box body 11 increases. At this time, the explosion relief valve 2 provides a safe pressure release channel, so that the harmful gas with a certain air pressure in the box body 11 can be discharged backward through the installation hole 111 of the box body 11 and the explosion relief valve 2, so that the faulty battery module 1 can pass the harmful gas through the corresponding explosion relief valve 2 and the sealing tube 3 to the gas overflow pipe 4 to avoid the harmful gas from spraying to the staff, which not only reduces the possibility of harm to the staff, but also reduces the risk of explosion of the entire battery module 1, and correspondingly reduces the failure range of the energy storage device including multiple battery modules 1, effectively avoiding affecting other battery modules 1 or staff adjacent thereto.

[0043] Among them, the explosion relief valve 2 can be fixed to the rear end of the box body 11 and the corresponding position of the mounting hole 111 by bolts. The area of ​​the explosion relief valve 2 should be larger than the area of ​​the mounting hole 111 so that the explosion relief valve 2 can completely cover the mounting hole 111. The sealing between the explosion relief valve 2 and the mounting hole 111 can also be improved.

[0044] Figure 2It is a schematic diagram of a first sealing structure 5 according to some embodiments of the present application.

[0045] In some embodiments, in combination Figure 1 and Figure 2 As shown, the energy storage device also includes a first sealing structure 5, which includes a sealing cover 51 and a first reinforcement structure 52. The sealing cover 51 is arranged around the explosion-proof valve 2, and the end of the sealing tube 3 away from the gas overflow tube 4 is connected to the sealing cover 51; the first reinforcement structure 52 is arranged on the side wall of the sealing cover 51 away from the box body 11, and the first reinforcement structure 52 includes a first annular reinforcement rib 521 and a plurality of reinforcement plates 522. The plurality of reinforcement plates 522 are arranged at intervals on the outside of the first annular reinforcement rib 521, and the reinforcement plates 522 are connected to the first annular reinforcement rib 521.

[0046] In at least one embodiment, since the sealing cover 51 is arranged around the explosion-proof valve 2, and the end of the sealing tube 3 away from the gas overflow pipe 4 is connected to the sealing cover 51, when the single battery cell 12 in the box body 11 fails and produces harmful gas, the harmful gas in the box body 11 can pass through the explosion-proof valve 2 and the sealing tube 3 into the gas overflow pipe 4. In this process, the sealing cover 51 can effectively improve the sealing between the sealing tube 3 and the explosion-proof valve 2 to prevent the leakage of harmful gas.

[0047] The sealing cover 51 can be arranged around the explosion relief valve 2 in the following manner, for example, a bypass opening is opened in the middle of the sealing cover 51, and the area of ​​the bypass opening is larger than the explosion relief valve 2, so that the bypass opening of the sealing cover 51 hinders the communication between the sealing tube 3 and the explosion relief valve 2. Among them, since the explosion relief valve 2 is a prior art, the specific structure of the explosion relief valve 2 is not elaborated. It mainly meets the requirement that when the pressure inside the box body 11 of the battery module 1 continues to rise to a certain value, the explosion relief valve 2 is destroyed so that the battery module 1 is depressurized, and various explosion relief valves 2 that prevent battery explosion are applicable to the present technical solution.

[0048] Furthermore, by arranging the first reinforcement structure 52 on the side wall of the sealing cover 51 away from the box body 11 , the first reinforcement structure 52 can not only strengthen the mechanical structure of the sealing cover 51 , but also reduce interference with the connection between the sealing cover 51 and the box body 11 .

[0049] Since the plurality of reinforcing plates 522 are spaced apart on the outside of the first annular reinforcing rib 521 and the reinforcing plates 522 are connected to the first annular reinforcing rib 521, the mechanical strength of the sealing cover 51 can be further enhanced by increasing the area of ​​the reinforcing structure on the side wall of the sealing cover 51 away from the box body 11, thereby preventing the sealing cover 51 from being deformed and correspondingly extending the service life of the sealing structure.

[0050] In some embodiments, in combination Figure 2 As shown, the first sealing structure 5 further includes a plurality of first fasteners 53 , which are arranged around the mounting hole 111 and penetrate the sealing cover 51 and the box body 11 .

[0051] In at least one embodiment, a plurality of the first fasteners 53 are arranged around the mounting hole 111 so that the plurality of first fasteners 53 apply a uniform fastening force to the sealing cover 51 from the outer periphery of the mounting hole 111 to improve the installation stability of the sealing cover 51 .

[0052] In some embodiments, in combination Figure 2 As shown, the first sealing structure 5 also includes a first sealing ring 54, which is arranged between the sealing cover 51 and the box body 11. The first sealing ring 54 is provided with a plurality of positioning holes 541, and the positioning holes 541 are arranged corresponding to the first fastener 53. The first fastener 53 is passed through the sealing cover 51 and the positioning holes 541 of the first sealing ring 54 and connected to the box body 11.

[0053] In at least one embodiment, the first sealing ring 54 can be installed between the sealing cover 51 and the box body 11 in the following manner. For example, the first sealing ring 54 is first placed between the sealing cover 51 and the rear end of the box body 11, and then the first fastener 53 is passed through the positioning hole 541 of the sealing cover 51 and the first sealing ring 54 to fix the sealing cover 51 and the first sealing ring 54 on the box body 11. At this time, the first sealing ring 54 can not only strengthen the sealing between the sealing cover 51 and the box body 11, but also the first fastener 53 is passed through the positioning hole 541, which can also prevent the first sealing ring 54 from shaking during operation, so as to further enhance the installation stability of the first sealing ring 54.

[0054] In some embodiments, in combination Figure 2 As shown, the first fastener 53 is disposed between at least part of two adjacent reinforcing plates 522 .

[0055] In at least one embodiment, since the first fastener 53 is arranged between at least part of the adjacent two reinforcing plates 522, in other words, the first fastener 53 is arranged in the area having the first reinforcing structure 52 on the side wall of the sealing cover 51 away from the box body 11, when the sealing cover 51 is fixed to the box body 11 by the first fastener 53, the two adjacent reinforcing plates 522 can further increase the mechanical strength of the connection area between the sealing cover 51 and the box body 11. When the explosion-proof valve 2 releases the harmful gas inside the box body 11, the surface of the sealing cover 51 has the first reinforcing structure 52, which can reduce the deformation degree of the sealing cover 51 and further extend the service life of the first sealing structure 5.

[0056] In some embodiments, in combination Figure 2 and Figure 4 As shown, the first sealing structure 5 also includes a second sealing ring 55, and the side wall of the sealing cover 51 away from the box body 11 is provided with a mounting groove 511, and one end of the sealing tube 3 away from the gas overflow pipe 4 is embedded in the mounting groove 511, and the second sealing ring 55 is installed in the mounting groove 511 and is sealed and connected to the sealing tube 3.

[0057] In at least one embodiment, the mounting groove 511 is used to install the second sealing ring 55, and the mounting groove 511 can prevent the second sealing ring 55 from being detached or misplaced; when the end of the sealing tube 3 away from the gas overflow tube 4 is embedded in the mounting groove 511, the second sealing ring 55 is arranged on the inner side of the mounting groove 511 and the end of the sealing tube 3 away from the gas overflow tube 4. At this time, the second sealing ring 55 can press the sealing tube 3 into the mounting groove 511, so that the second sealing ring 55 can further strengthen the sealing between the sealing tube 3 and the sealing cover 51 to prevent leakage at the connection between the sealing tube 3 and the sealing cover 51.

[0058] In addition, the installation groove 511 can be set in the following manner. For example, the first reinforcement structure 52 also includes a second annular reinforcement rib 523. The second annular reinforcement rib 523 is arranged on the inner side of the first annular reinforcement rib 521, so the installation groove 511 can be formed between the second annular reinforcement rib 523 and the first annular reinforcement rib 521.

[0059] Figure 4 for Figure 1 Enlarged view of part A.

[0060] In some embodiments, in combination Figure 4 As shown, the energy storage device also includes a second sealing structure 6, which includes a second fastener 61 and a third sealing ring 62, wherein the third sealing ring 62 is arranged between the sealing tube 3 and the gas overflow tube 4, and the sealing tube 3 is connected to the gas overflow tube 4 via the second fastener 61.

[0061] In at least one embodiment, since the third sealing ring 62 is arranged between the sealing tube 3 and the gas overflow tube 4, the third sealing ring 62 can effectively strengthen the sealing between the sealing tube 3 and the gas overflow tube 4 to reduce the possibility of harmful gas leakage between the sealing tube 3 and the gas overflow tube 4.

[0062] The number of the second fasteners 61 can be multiple, and the multiple second fasteners 61 are distributed around the central axis of the sealing tube 3, so that the multiple second fasteners 61 are inserted through the sealing tube 3 and the gas overflow tube 4, so as to fix the sealing tube 3 to the gas overflow tube 4 through the second fasteners 61. The second fasteners 61 and the first fasteners 53 can be bolt fasteners or screws, which are not specifically limited here.

[0063] Figure 5 This is a second schematic diagram of the explosion structure of the energy storage device according to some embodiments of the present application; Figure 6 for Figure 5 Enlarged view of part B.

[0064] In some embodiments, in combination Figure 5 and Figure 6 As shown, the sealing tube 3 includes a pipe joint 31 and a folded edge portion 32. The pipe joint 31 is bent outward toward one end of the gas overflow pipe 4 to form the folded edge portion 32. The folded edge portion 32 is connected to the gas overflow pipe 4 through a plurality of second fasteners 61 arranged in a ring shape.

[0065] In at least one embodiment, the pipe joint 31 is bent outward toward one end of the gas overflow pipe 4 to form a folded edge portion 32, so that the folded edge portion 32 is parallel to the surface of the gas overflow pipe 4, so as to increase the contact area between the two, thereby facilitating the connection of the folded edge portion 32 with the gas overflow pipe 4 through the second fastener 61, thereby improving the convenience and stability of the connection between the sealing tube 3 and the gas overflow pipe 4.

[0066] In some embodiments, the sealing tube 3 further includes a second reinforcement structure 33 , and two ends of the second reinforcement structure 33 are respectively connected to the outer wall of the pipe joint 31 and the folded edge portion 32 .

[0067] In at least one embodiment, the two ends of the second reinforcement structure 33 are respectively connected to the outer wall of the pipe joint 31 and the folded edge portion 32, so that the connection strength between the folded edge portion 32 and the pipe joint 31 can be further strengthened, so as to correspondingly improve the mechanical strength of the sealing tube 3, and effectively prevent the connection between the sealing tube 3 and the gas overflow tube 4 from being deformed and causing leakage when harmful gas passes through the sealing tube 3 when the explosion relief valve 2 is working.

[0068] The second reinforcement structure 33 may be a triangular plate structure or a rectangular structure, etc., which is not specifically limited here.

[0069] Figure 7 It is a schematic diagram of a partial structure of a battery module according to some embodiments of the present application; Figure 8 It is a schematic diagram of a partial explosion structure of a battery module according to some embodiments of the present application.

[0070] In some embodiments, in combination Figure 7 and Figure 8 As shown, the battery module also includes a radiator 7 and a plurality of heat dissipation brackets 13 arranged in the box body, the plurality of single cells 12 and the plurality of heat dissipation brackets 13 are respectively arranged along the first direction, and the single cells 12 are mounted on the heat dissipation brackets 13; the single cells 12 include a cell body 121 and a conductive electrode 122, and the conductive electrode 122 is arranged at the end of the cell body 121 perpendicular to the first direction; the radiator 7 is arranged on one side of the box body 11 along the vertical direction, and the heat dissipation bracket 13 is in contact with and connected to the radiator 7.

[0071] In at least one embodiment, the single cell 12 is a soft-pack cell. Based on the relevant design requirements of the battery module, each single cell is installed on the corresponding heat dissipation bracket 13. A plurality of single cells 12 and a plurality of heat dissipation brackets 13 are arranged in the box body 11 along the first direction; each single cell 12 includes a cell body 121 and a conductive electrode 122. Since the conductive electrode 122 is arranged at the end of the cell body 121 perpendicular to the first direction, it can be understood that the conductive electrode 122 is arranged at one end of the extension direction (length direction) of the cell body 121, and the conductive electrode 122 is arranged at one end of the extension direction of the cell body 121. The surface area of ​​the other end of the electrode 122 is small, so that the radiator 7 is not suitable for installation on the side of the extension direction of the single battery cell 12. After the multiple single battery cells 12 are installed in the box body 11 through the corresponding heat dissipation brackets 13, since the first opening can be opened at the bottom of the box body 11, the multiple single battery cells 12 can be connected to the radiator 7 through their respective heat dissipation brackets 13 from the first opening of the box body 11, so that the heat generated by the single battery cell during operation is conducted to the radiator 7 through the heat dissipation bracket 13, so that the multiple single battery cells 12 are cooled by natural air cooling at the same time through the radiator 7.

[0072] The first direction is Figure 7 The first direction is parallel to the Y-axis in the coordinate system; the first direction is perpendicular to the extension direction (length direction) of the battery cell body 121 and is perpendicular to the first direction. Figure 7 The vertical direction refers to the height direction of the battery cell body 121 and is parallel to the X-axis direction in the coordinate system; Figure 7 Since the conductive electrode 122 is arranged at the end of the battery body 121 perpendicular to the first direction, and the heat sink 7 is arranged on one side of the box body 11 along the vertical direction, for example, at the lower position, the heat sink 7 can be equivalent to the bottom plate of the box body 11. At this time, the heat sink 7 can not only dissipate heat and cool the single battery cell 12, but also support all the single battery cells 12 from below to prevent the box body 11 of the battery module from being in hard contact with the transportation tool during transportation and damaging the single battery cell 12.

[0073] Furthermore, combined with Figure 8 As shown, the heat dissipation bracket 13 includes a heat dissipation plate 131, a middle frame 132 and a thermally conductive structural adhesive 133. The single battery cell 12 can be fixedly installed on the heat dissipation plate 131 by the thermally conductive structural adhesive 133, and the heat dissipation plate 131 has two folded edges arranged opposite to each other up and down. When the heat dissipation plate 131 and the middle frame 132 are assembled, the two folded edges are respectively located on the upper and lower sides of the middle frame 132, and the folded edges of the heat dissipation plate 131 and the middle frame 132 can be quickly fixed and assembled by means of a snap-fit ​​structure, a boss groove structure, etc., and the middle frame 132 has a certain supporting effect on the heat dissipation plate 131 to prevent the heat dissipation plate 131 from being deformed due to fatigue under the gravity of the single battery cell, thereby correspondingly extending the service life of the battery module.

[0074] The middle frames 132 of two adjacent heat dissipation brackets 13 arranged along the first direction can be assembled by means of snap-fitting, snap-fitting and slotting.

[0075] When multiple single cells 12 are assembled in the box through the corresponding heat dissipation brackets 13, the radiator 7 is installed at the bottom of the box, and the folded edge at the bottom of the heat dissipation plate 131 is in contact with the radiator 7, so that the heat generated by the single cells 12 can be quickly transferred to the radiator 7 through the heat dissipation plate 131, so that the heat dissipation and cooling operation of multiple single cells 12 can be performed simultaneously through the radiator 7. Among them, the heat dissipation plate 131 can be made of a metal material with good thermal conductivity, such as aluminum material, and the radiator 7 can be an air-cooled radiator with multiple fin structures; the middle frame 132 can be made of a plastic material with a certain mechanical strength.

[0076] One or more embodiments of the present application further disclose an energy storage system, which includes a housing and an energy storage device as described in the above embodiment, wherein the energy storage device is disposed in the housing.

[0077] In at least one embodiment, the energy storage device includes a battery cluster consisting of multiple battery modules 1, multiple explosion relief valves 2, multiple sealing tubes 3 and a gas overflow pipe 4. The single battery modules 1, explosion relief valves 2 and sealing tubes 3 in the battery cluster are relatively arranged so that the harmful gas generated in any failed battery module 1 can enter the gas overflow pipe 4 through the corresponding explosion relief valve 2 and sealing tube 3 for convergence or storage; the energy storage system may include at least one energy storage device. In other words, if the energy storage system includes at least two energy storage devices, the number of gas overflow pipes 4 in the energy storage system is also at least two; and when the energy storage device is installed in an outer shell, the end of the gas overflow pipe 4 away from the sealing tube 3 can extend out of the outer shell to avoid the harmful gas in the gas overflow pipe 4 from being retained in the outer shell. When the staff maintains the battery module 1, the harmful gas retained in the outer shell can be effectively avoided to affect the personal safety of the staff.

[0078] The energy storage system has all the technical effects of the energy storage device and will not be elaborated here.

[0079] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. An energy storage device, characterized in that: It includes multiple battery modules, multiple explosion-proof valves, multiple sealing tubes and gas overflow pipes. The battery module includes a box body and multiple single cells. The multiple single cells are arranged in the box body. The end of the box body along the first direction is provided with a mounting hole, and the explosion-proof valve is installed at the mounting hole; the multiple sealing tubes are arranged on the gas overflow pipe in a vertically spaced manner, and at least some of the sealing tubes are connected to the gas overflow pipe, and the end of the sealing tube away from the gas overflow pipe is connected to the explosion-proof valve.

2. The energy storage device according to claim 1, characterized in that: It also includes a first sealing structure, which includes a sealing cover and a first reinforcement structure. The sealing cover is arranged around the explosion-proof valve, and the end of the sealing tube away from the gas overflow pipe is connected to the sealing cover; the first reinforcement structure is arranged on the side wall of the sealing cover away from the box body, and the first reinforcement structure includes a first annular reinforcement rib and a plurality of reinforcement plates. The plurality of reinforcement plates are arranged at intervals on the outside of the first annular reinforcement rib, and the reinforcement plate is connected to the first annular reinforcement rib.

3. The energy storage device according to claim 2, characterized in that: The first sealing structure further includes a plurality of first fasteners, which are arranged around the mounting hole and penetrate the sealing cover and the box body.

4. The energy storage device according to claim 3, characterized in that: The first sealing structure also includes a first sealing ring, which is arranged between the sealing cover and the box body. The first sealing ring is provided with a plurality of positioning holes, and the positioning holes are arranged corresponding to the first fastener. The first fastener is passed through the positioning holes of the sealing cover and the first sealing ring and connected to the box body.

5. The energy storage device according to claim 2, characterized in that: The first sealing structure also includes a second sealing ring. The sealing cover is provided with a mounting groove on the side wall away from the box body. One end of the sealing tube away from the gas overflow tube is embedded in the mounting groove. The second sealing ring is installed in the mounting groove and is sealed and connected to the sealing tube.

6. The energy storage device according to claim 1, characterized in that: It also includes a second sealing structure, which includes a second fastener and a third sealing ring. The third sealing ring is arranged between the sealing tube and the gas overflow tube. The sealing tube is connected to the gas overflow tube through the second fastener.

7. The energy storage device according to claim 6, characterized in that: The sealing tube includes a pipe joint and a folded edge portion, wherein the pipe joint is bent outwardly toward one end of the gas overflow pipe to form the folded edge portion, and the folded edge portion is connected to the gas overflow pipe through a plurality of second fasteners arranged in a ring shape.

8. The energy storage device according to claim 7, characterized in that: The sealing tube further comprises a second reinforcement structure, two ends of which are respectively connected to the outer wall of the pipe joint and the folded edge portion.

9. The energy storage device according to claim 1, characterized in that: The battery module also includes a radiator and a plurality of heat dissipation brackets arranged in the box body, the plurality of single cells and the plurality of heat dissipation brackets are respectively arranged along the first direction, and the single cells are mounted on the heat dissipation brackets; the single cells include a cell body and a conductive electrode, and the conductive electrode is arranged at the end of the cell body perpendicular to the first direction; the radiator is arranged on one side of the box body along the vertical direction, and the heat dissipation bracket is in contact with and connected to the radiator.

10. An energy storage system, characterized in that: It comprises a housing and an energy storage device as claimed in any one of claims 1 to 9, wherein the energy storage device is arranged in the housing.

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