Explosion venting connecting assembly, high-capacity battery and battery cluster

Abstract

The utility model provides an explosion venting connecting assembly, a high-capacity battery and a battery cluster, and mainly solves the problem of potential safety hazards caused by the fact that thermal runaway smoke in the existing high-capacity battery cannot be timely and accurately exhausted. The explosion venting connecting assembly comprises a first connecting pipe, a second connecting pipe and a connecting assembly body. The first connecting pipe is used for being connected with an explosion venting opening of a high-capacity battery, and the second connecting pipe is used for being connected with an explosion venting collecting pipe; the connecting assembly comprises a ceramic tube, a first sealing gasket and a second sealing gasket; one end of the ceramic tube is in threaded connection with the first connecting tube, and the other end of the ceramic tube is in threaded connection with the second connecting tube. Meanwhile, the first connecting pipe, the second connecting pipe and the ceramic pipe are sealed through the first sealing washer and the second sealing washer, so that the thread length of the original ceramic pipe is shortened, the ceramic pipe is easy to rotate during assembly, the end face is not broken any more, and the reliability of connection between the high-capacity battery and the explosion venting collecting pipe is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and particularly relates to an explosion relief connection assembly, a large-capacity battery and a battery cluster. Background Art

[0002] As a new type of energy storage device, the energy storage container has the advantages of being portable, flexible, efficient, etc., and is widely used in fields such as power systems, transportation, aerospace, etc. The existing energy storage containers on the market include a plurality of battery clusters, each battery cluster includes a plurality of large-capacity batteries (which can also be called battery packs or battery modules), and each large-capacity battery is composed of a housing and a plurality of single batteries arranged in the housing.

[0003] Due to the high concentration of large-capacity batteries in the energy storage container, under the influence of factors such as overcharging, over-discharging, and overheating of individual single batteries in the large-capacity batteries, thermal runaway is likely to occur. If the thermal runaway smoke generated by thermal runaway cannot be discharged in a timely and accurate manner, thermal runaway will continue to occur and spread, and in severe cases, it will cause the combustion or explosion of large-capacity batteries or even battery clusters, thereby triggering potential safety hazards. Summary of the Invention

[0004] The utility model provides an explosion relief connection assembly, a large-capacity battery and a battery cluster, mainly solving the problem of potential safety hazards caused by the failure to discharge the thermal runaway smoke in the existing large-capacity batteries in a timely and accurate manner.

[0005] To solve the above problems, the technical solution provided by the utility model is as follows:

[0006] An explosion relief connection assembly includes a first connection pipe, a second connection pipe and a connection assembly; the first connection pipe is used to connect with the explosion relief port of the large-capacity battery, and an explosion relief film is provided inside the first connection pipe or in the explosion relief port of the large-capacity battery, and the second connection pipe is used to connect with the explosion relief manifold; the connection assembly includes a ceramic pipe, a first sealing gasket and a second sealing gasket; one end of the ceramic pipe is threadedly connected with the first connection pipe, and the first sealing gasket is arranged at the connection between the first connection pipe and the ceramic pipe to achieve the seal between the first connection pipe and the ceramic pipe; the other end of the ceramic pipe is threadedly connected with the second connection pipe, and the second sealing gasket is arranged at the connection between the second connection pipe and the ceramic pipe to achieve the seal between the second connection pipe and the ceramic pipe.

[0007] Further, the end of the ceramic pipe connected with the second connection pipe is provided with an external thread; the second sealing gasket is a T-shaped sealing gasket, including a sealing part and a bushing part, the sealing part is arranged at the end of the ceramic pipe, and the bushing part is arranged inside the ceramic pipe.

[0008] Further, the first sealing gasket and the second sealing gasket are polytetrafluoroethylene gaskets or gaskets made of PEEK.

[0009] Furthermore, an annular limiting boss is provided on the first connecting pipe, and the annular limiting boss is used to cooperate with the explosion vent of the large-capacity battery to realize the fixed connection of the first connecting pipe.

[0010] Furthermore, the second connecting pipe is a tee pipe, its first interface is connected to the ceramic pipe, and the second interface and the third interface are respectively used to be connected to the flexible pipe sections that form the explosion vent collecting pipe.

[0011] Furthermore, the second connecting pipe is a flexible hollow pipe fitting, one end of the flexible hollow pipe fitting is connected to the ceramic pipe, and the other end is used to be connected to the explosion vent collecting pipe.

[0012] The utility model provides a large-capacity battery, which includes a housing and a plurality of single batteries arranged in the housing along the same direction; a shared chamber is provided in the housing, and the inner cavity of the shared chamber is communicated with the inner cavities of all single batteries; an explosion vent is provided on the housing, and the above-mentioned explosion vent connection assembly is connected to the explosion vent.

[0013] Furthermore, relief holes are provided on the top plate of the housing corresponding to the polarity terminals of each single battery; the polarity terminals of each single battery extend out of the relief holes, and the area of the top plate of the housing corresponding to the relief holes is fixedly sealed with the housing of the single battery; clamping portions are provided at the parts where the polarity terminals of each single battery extend out of the relief holes; the heat transfer pipes are fixed on the clamping portions of the polarity terminals of each single battery, and the heat transfer pipes are insulated from each single battery.

[0014] The utility model provides a battery cluster, which includes an explosion vent collecting pipe and n large-capacity batteries, where n is an integer greater than 1; the second connecting pipes of each large-capacity battery are all connected to the explosion vent collecting pipe, one end of the explosion vent collecting pipe is sealed, and the other end is open, serving as the heat runaway flue gas discharge port of the battery cluster.

[0015] Furthermore, the second connecting pipe is a tee pipe, and the second connecting pipes of adjacent large-capacity batteries are connected through flexible pipe sections to form an explosion vent collecting pipe.

[0016] Furthermore, the second connecting pipe is a flexible hollow pipe fitting, and the explosion vent collecting pipe includes a main pipe and n branch pipes arranged on the main pipe; the n branch pipes are connected to the second connecting pipes of the n large-capacity batteries in one-to-one correspondence.

[0017] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0018] 1. The utility model collects the explosion vents of all large-capacity batteries in the battery cluster with the explosion vent connection assembly and the explosion vent collecting pipe. When a single battery in any large-capacity battery in the battery cluster has a thermal runaway, its thermal runaway flue gas can be discharged through the explosion vent collecting pipe, reducing the risk of thermal runaway diffusion, combustion or explosion of large-capacity batteries or even the battery cluster.

[0019] Meanwhile, large-capacity batteries and the explosion relief busbar are connected through an explosion relief connection assembly. During specific connection, the first connecting pipe, the second connecting pipe, and the ceramic pipe are connected through threads. At the same time, the first connecting pipe, the second connecting pipe, and the ceramic pipe are mainly sealed through threaded connection and the first sealing washer and the second sealing washer. Since the first sealing washer and the second sealing washer are added for sealing, the threaded length of the ceramic pipe can be set relatively short. When the threaded length of the ceramic pipe is short, the assembly rotation resistance is small, the rotation is easy, and the end face of the ceramic pipe is not easily broken, ensuring the reliability of the connection between the large-capacity battery and the explosion relief busbar. At the same time, the short threaded length of the ceramic pipe also reduces the processing difficulty of the ceramic pipe.

[0020] 2. In the explosion relief connection assembly of the present utility model, the second sealing washer is a T-shaped sealing washer. The sealing part of the T-shaped sealing washer is extruded by the end faces of the second connecting pipe and the ceramic pipe to achieve the sealing between the ceramic pipe and the second connecting pipe. The bushing part is arranged inside the ceramic pipe, and together with the sealing part, it completely wraps the end of the ceramic pipe to protect the end of the ceramic pipe and further prevent the ceramic pipe from being damaged during installation. In addition, after the bushing part is installed, it can position the entire second sealing washer, avoiding the possible unreliable sealing due to the offset and deformation of the sealing part, and further ensuring the reliability of the sealing.

[0021] 3. In the explosion relief connection assembly of the present utility model, the first connecting pipe is fixedly connected to the large-capacity battery through an annular limiting boss. This connection method can not only achieve the accurate installation of the first connecting pipe but also facilitate the sealing at the connection between the first connecting pipe and the large-capacity battery.

[0022] 4. In the explosion relief connection assembly of the present utility model, the second connecting pipe is a three-way pipe. Flexible pipe segments are used to connect the three-way pipes of adjacent large-capacity batteries to form an explosion relief busbar. This method has relatively low requirements for the installation accuracy of the large-capacity batteries and the explosion relief busbar. The installation deviation of the explosion relief connection assembly can be compensated by the deformation of the flexible pipe segments, reducing the installation difficulty of the explosion relief busbar.

[0023] 5. In the explosion relief connection assembly of the present utility model, the second connecting pipe is a flexible hollow pipe fitting. The flexible hollow pipe fitting is used to connect to a non-spliced integral explosion relief busbar. This has relatively low requirements for the installation accuracy of the large-capacity batteries and the explosion relief busbar. The installation deviation of the explosion relief connection assembly can be compensated by the deformation of the flexible hollow pipe fitting, reducing the installation difficulty between it and the explosion relief busbar. At the same time, using a non-spliced integral explosion relief busbar reduces the risk of liquid leakage to a certain extent.

[0024] 6. In the battery cluster of the present utility model, the heat transfer pipe exchanges heat with the polar terminals of each single battery. The heat transfer pipe conducts the heat of the polar terminals where the heat is most concentrated in the large-capacity battery to the outside for processing to ensure that the large-capacity battery operates within the optimal temperature range.

[0025] 7. In the battery cluster of the present utility model, the explosion relief connection components of all large-capacity batteries in the battery cluster are converged through an explosion relief busbar. When a single battery in any large-capacity battery in the battery cluster undergoes thermal runaway, the thermal runaway flue gas can be discharged through the explosion relief busbar, reducing the risk of thermal runaway diffusion, combustion or explosion of large-capacity batteries or even the battery cluster.

[0026] Other advantages, objectives and features of the present utility model will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the present utility model. Brief Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 Schematic diagram of the connection between the explosion relief connection component and the large-capacity battery in Embodiment 1;

[0029] Figure 2 Explosion diagram of the explosion relief connection component in Embodiment 1;

[0030] Figure 3 Cross-sectional view of the explosion relief connection component in Embodiment 1;

[0031] Figure 4 Schematic diagram of the structure of the large-capacity battery (the second connection pipe is a flexible hollow pipe fitting) in Embodiment 1;

[0032] Figure 5 Schematic diagram of the structure of the large-capacity battery in Embodiment 2;

[0033] Figure 6 Schematic diagram of the structure of the large-capacity battery with a heat transfer pipe in Embodiment 2;

[0034] Figure 7 Explosion diagram of the large-capacity battery in Embodiment 2;

[0035] Figure 8 Explosion schematic diagram of the battery cluster (the explosion relief busbar is a spliced pipe) in Embodiment 3;

[0036] Figure 9 Schematic diagram of the structure of the battery cluster (the explosion relief busbar is a spliced pipe) in Embodiment 3;

[0037] Figure 10It is a schematic structural diagram of the battery cluster (the explosion vent busbar is a whole pipe) in Embodiment 3.

[0038] Reference numerals: 1 - high-capacity battery, 2 - explosion vent connection assembly, 3 - explosion vent busbar, 11 - housing, 12 - single battery, 13 - polarity terminal, 14 - heat transfer pipe, 15 - insulation protective cover, 111 - gas sharing chamber, 112 - electrolyte sharing chamber, 113 - explosion vent, 21 - first connecting pipe, 22 - second connecting pipe, 23 - ceramic pipe, 24 - first sealing gasket, 25 - second sealing gasket, 211 - explosion vent film, 212 - annular limiting boss, 241 - sealing part, 242 - bushing part, 31 - flexible pipe section, 32 - main pipe, 33 - branch pipe. Detailed implementation manners

[0039] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following describes the detailed implementation manners of the present utility model in conjunction with the accompanying drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0040] In this specification, "in other embodiments" that appears in different places does not necessarily refer to the same embodiment, nor is it a separate or selectively mutually exclusive embodiment with other embodiments. In the description of this specification, 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 quantity of the indicated technical features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0041] In the description of this specification, unless otherwise clearly specified and limited, the term "connection" 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 directly connected, or indirectly connected through an intermediate member, or it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present utility model can be understood according to specific circumstances.

[0042] At the same time, in the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "top, bottom, inner, and outer" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0043] To prevent the thermal runaway flue gas of individual cells in a large-capacity battery from spreading to the entire energy storage container and causing safety problems, the utility model collects the thermal runaway flue gas of all large-capacity batteries in the battery cluster by using an explosion venting manifold. After thermal runaway occurs in any cell of a large-capacity battery in the battery cluster, its thermal runaway flue gas can be discharged through the explosion venting manifold, reducing the risk of thermal runaway spreading, combustion or explosion of large-capacity batteries or even the battery cluster.

[0044] To further improve the safety of using large-capacity batteries, the connection between the explosion venting manifold and the large-capacity battery needs to ensure sealing and insulation. Based on this, the utility model provides an explosion venting connection assembly, which realizes the sealed, insulated and high-temperature-resistant connection between the large-capacity battery and the explosion venting manifold, so that the thermal runaway flue gas of all large-capacity batteries in the battery cluster can be collected by the explosion venting manifold.

[0045] The above explosion venting connection assembly specifically includes a first connecting pipe, a second connecting pipe and a ceramic pipe; the first connecting pipe is used to connect with the explosion vent of the large-capacity battery, and the second connecting pipe is used to connect with the explosion venting manifold. The first connecting pipe and the second connecting pipe are connected by the ceramic pipe. The ceramic pipe is an insulating pipe, which can effectively realize the insulation between the explosion venting manifold and the large-capacity battery. At the same time, the ceramic pipe is a high-temperature-resistant pipe, which can avoid problems such as deformation and leakage caused by high temperature.

[0046] The above ceramic pipe is fixedly connected to the first connecting pipe and the second connecting pipe respectively by threads. After connection, the sealing performance is mainly realized by the relatively long threaded connection sections between the ceramic pipe and the first connecting pipe and the second connecting pipe. However, during actual installation, when the ceramic pipe is rotated and locked with the first connecting pipe and the second connecting pipe, there are situations such as difficult rotation and fragmentation of the end face of the ceramic pipe during connection, which may cause unreliable connection problems.

[0047] Based on this, the above structure is optimized. The length of the original threaded section of the ceramic pipe is shortened, and then a first sealing washer and a second sealing washer are respectively arranged at both ends of the ceramic pipe. The sealing between the ceramic pipe and the first connecting pipe and the second connecting pipe is realized through the first sealing washer and the second sealing washer. Since the length of the threaded section of the ceramic pipe is shortened, when the first connecting pipe and the second connecting pipe are connected and assembled with the ceramic pipe by threads, the rotation resistance is small, the rotation during assembly is easy, and it is easy to assemble. At the same time, the first sealing washer and the second sealing washer completely wrap the end face of the ceramic pipe, avoiding the situation of fragmentation of the end face of the ceramic pipe. In addition, the shortening of the threaded length of the ceramic pipe also reduces the processing difficulty of the ceramic pipe.

[0048] The above-mentioned ceramic tube, first sealing washer, and second sealing washer achieve a sealed and insulated connection between the large-capacity battery and the explosion relief busbar, ensuring the safety of the large-capacity battery during use. At the same time, the structure of the explosion relief connection component is relatively simple, with good sealing performance, enabling a simple and rapid connection between the large-capacity battery and the explosion relief busbar, having a high assembly efficiency and being relatively convenient to disassemble.

[0049] The above-mentioned explosion relief connection component can be applied to large-capacity batteries with various different structures. For example, it can be applied to the large-capacity batteries disclosed in Chinese patents CN117477186A, CN117477063A, and CN115275453A; such large-capacity batteries all include a plurality of single cells and a shared chamber that is in communication with the inner cavities of each single cell (here, the shared chamber is the first hollow member or the second hollow member described in CN117477186A, the hollow member described in CN117477063A, and the electrolyte sharing channel described in CN115275453A); in the present utility model, one end of the above-mentioned shared chamber is used as the explosion relief port of the large-capacity battery and is connected to the explosion relief connection component.

[0050] The above-mentioned explosion relief connection component can also be applied to the large-capacity battery disclosed in Chinese patent CN220324596U. Such a large-capacity battery includes a housing and a plurality of single cells arranged in the housing; the inner cavities of each single cell are in communication with the inner cavity of the housing; an explosion relief port is provided on the housing, and in the present utility model, the explosion relief connection component is connected to this explosion relief port.

[0051] The above-mentioned explosion relief connection component can also be applied to a single cell and is in communication with the explosion relief port of the single cell; for example, it can be used as the explosion relief tube in the battery disclosed in Chinese patent CN113725552A to connect the explosion relief ports of each single cell to the explosion relief busbar.

[0052] Taking a large-capacity battery including a housing and a plurality of single cells arranged in the housing as an example, the structure of the explosion relief connection component will be described in detail below.

[0053] Embodiment 1

[0054] As Figures 1 to 3As shown in the figure, this embodiment provides a pressure relief connection component. The pressure relief connection component 2 mainly realizes the connection between the large-capacity battery 1 and the pressure relief manifold to direct the discharge of the thermal runaway flue gas in the large-capacity battery 1. The pressure relief connection component 2 includes a first connection pipe 21, a second connection pipe 22, and a connection component. The first connection pipe 21 is used to connect with the pressure relief port 113 of the large-capacity battery 1. A pressure relief membrane 211 is provided in the pressure relief port 113 of the large-capacity battery 1 or in the first connection pipe 21. The second connection pipe 22 is used to connect with the pressure relief manifold. The connection component includes a ceramic pipe 23, a first sealing gasket 24, and a second sealing gasket 25. The two ends of the ceramic pipe 23 are respectively connected to the first connection pipe 21 and the second connection pipe 22. The first sealing gasket 24 and the second sealing gasket 25 respectively realize the sealing between the ceramic pipe 23 and the first connection pipe 21 and the second connection pipe 22.

[0055] As Figure 2 shown, the above-mentioned first connection pipe 21 is a metal straight pipe, which is used for sealing connection with the pressure relief port 113 of the large-capacity battery 1. It can usually adopt the same aluminum metal as the outer shell of the large-capacity battery 1, or other metals such as stainless steel. The sealing connection with the pressure relief port 113 of the large-capacity battery 1 can be realized by welding, threaded connection, interference fit and other methods. After connection, it is necessary to ensure that the inner cavity of the first connection pipe 21 is connected to the outer shell of the large-capacity battery 1.

[0056] During specific connection, as Figure 2 and Figure 3 shown, the above-mentioned first connection pipe 21 is provided with an annular limiting boss 212. The annular limiting boss 212 is embedded in the pressure relief port 113 of the large-capacity battery 1 to realize the fixation of the first connection pipe 21. This connection method can not only realize the accurate installation of the first connection pipe 21, but also facilitate the sealing at the connection between the first connection pipe 21 and the large-capacity battery 1.

[0057] As Figure 3 shown, the pressure relief membrane 211 is installed in the pressure relief port 113 of the large-capacity battery 1 or in the first connection pipe 21. The pressure relief membrane 211 can be made of a plastic sheet or a metal sheet. If a plastic sheet is used, the pressure relief membrane 211 needs to be fixed by bonding. However, due to the insufficient pressure-bearing capacity of the bonding method, mis-pressure relief may occur. Therefore, in this embodiment, the pressure relief membrane 211 is made of a metal sheet and fixed by welding. For the convenience of welding, the pressure relief membrane 211 is preferably made of an aluminum sheet. For the convenience of welding the pressure relief membrane 211, in this embodiment, the pressure relief membrane 211 is fixed in the first connection pipe 21.

[0058] The above-mentioned second connection pipe 22 is used to connect with the pressure relief manifold, and the pressure relief manifold realizes the confluence of the thermal runaway flue gas of multiple large-capacity batteries 1. The second connection pipe 22 can specifically adopt the following structure:

[0059] First, as shown in Figure 2 , Figure 3 and Figure 8 , the second connecting pipe 22 is a tee pipe. Its first interface is hermetically connected to the ceramic pipe 23, and the second and third interfaces are respectively used to connect to the flexible pipe segments 31 that make up the explosion venting manifold pipe 3;

[0060] The second connecting pipe 22 is a tee pipe. By using the flexible pipe segments 31 to connect the tee pipes of adjacent large-capacity batteries 1, the explosion venting manifold pipe 3 is formed. The installation accuracy requirements for the explosion venting connection assemblies 2 of each large-capacity battery 1 are relatively small. The installation deviation of the explosion venting connection assembly 2 can be compensated by the deformation of the flexible pipe segments 31, reducing the installation difficulty of the explosion venting manifold pipe 3;

[0061] Second, as shown in Figure 4 , the second connecting pipe 22 is a flexible hollow pipe fitting. One end of the flexible hollow pipe fitting is hermetically connected to the ceramic pipe 23, and the other end is used to connect to the explosion venting manifold pipe 3. During specific connection, the second connecting pipe 22 can be fixed to the explosion venting manifold pipe 3 by welding or threaded connection. This flexible hollow pipe fitting is a corrugated pipe, which can be a metal corrugated pipe or a plastic corrugated pipe, but such corrugated pipes need to meet at least the requirements of high temperature resistance and corrosion resistance.

[0062] The second connecting pipe 22 is a flexible hollow pipe fitting. By using the flexible hollow pipe fitting to connect to the non-spliced integral explosion venting manifold pipe 3, the installation accuracy requirements for the explosion venting connection assemblies 2 of each large-capacity battery 1 are relatively small. The installation deviation of the explosion venting connection assembly 2 can be compensated by the deformation of the flexible hollow pipe fitting, reducing the installation difficulty between it and the explosion venting manifold pipe 3. At the same time, by using the non-spliced integral explosion venting manifold pipe 3, the risk of liquid leakage is reduced to a certain extent.

[0063] The above-mentioned first connecting pipe 21 and second connecting pipe 22 are hermetically and insulatedly connected through a connecting component. As shown in Figure 2 and Figure 3 , the connecting component in this embodiment includes a ceramic pipe 23, a first sealing washer 24, and a second sealing washer 25; one end of the ceramic pipe 23 is connected to the first connecting pipe 21, and the other end is connected to the second connecting pipe 22. This ceramic pipe 23 is an insulating pipe, insulating the explosion venting manifold pipe 3 from each large-capacity battery 1. At the same time, this ceramic pipe 23 is a high-temperature resistant pipe, ensuring that it does not deform when the large-capacity battery 1 undergoes thermal runaway, and ensuring that there is no leakage at the connection. In addition, the cost and processing of the ceramic pipe 23 are relatively simple, and ceramic materials such as cubic boron nitride, hexagonal boron nitride, alumina, and silicon carbide can be selected for production.

[0064] The above-mentioned ceramic tube 23 and the first connecting tube 21 are specifically connected by threads. At this time, the ceramic tube 23 is provided with internal threads, and the first connecting tube 21 is provided with external threads. The ceramic tube 23 and the first connecting tube 21 are connected by threads. At the same time, a first sealing washer 24 is provided between the ceramic tube 23 and the second connecting tube 22, and the first sealing washer 24 realizes the sealing between the ceramic tube 23 and the first connecting tube 21.

[0065] The above-mentioned ceramic tube 23 and the second connecting tube 22 are specifically connected by threads. At this time, the ceramic tube 23 is provided with external threads, and the second connecting tube 22 is provided with internal threads. The ceramic tube 23 and the second connecting tube 22 are connected by threads. At the same time, a second sealing washer 25 is provided between the ceramic tube 23 and the second connecting tube 22, and the second sealing washer 25 realizes the sealing between the ceramic tube 23 and the second connecting tube 22.

[0066] The above connection method realizes the sealing between the first connecting tube 21, the second connecting tube 22 and the ceramic tube 23 through the first sealing washer 24 and the second sealing washer 25. Furthermore, the thread length of the original ceramic tube 23 can be shortened. Since the thread length of the ceramic tube 23 is shortened, the rotation resistance during assembly is small, the rotation during assembly is easy, and the end face of the ceramic tube 23 will no longer be broken, ensuring the reliability of the connection between the large-capacity battery 1 and the explosion vent busbar 3. At the same time, the shortening of the thread length of the ceramic tube 23 also reduces the processing difficulty of the ceramic tube 23.

[0067] The above-mentioned first sealing washer 24 and second sealing washer 25 are generally made of materials with high temperature resistance and corrosion resistance to meet the requirements during their use. This is because the thermal runaway flue gas has a relatively high temperature, and there may be corrosive gases or molten impurities in the thermal runaway flue gas. In this embodiment, the first sealing washer 24 and the second sealing washer 25 can specifically adopt a polytetrafluoroethylene washer + 20% glass fiber, or a washer made of PEEK.

[0068] Both the above-mentioned first sealing washer 24 and second sealing washer 25 can adopt flat washers. During actual connection, it is found that the end of the ceramic tube 23 with external threads is more likely to generate stress concentration and is prone to cracking compared to the end with internal threads. At this time, to further improve the safety during use, the sealing washer at the end of the ceramic tube 23 with external threads is set as a T-shaped sealing washer. Taking the end of the ceramic tube 23 with external threads connected to the second connecting tube 22 as an example, the T-shaped sealing washer will be described.

[0069] As Figure 3As shown in the figure, the second sealing washer 25 in this embodiment is a T-shaped sealing washer. The T-shaped sealing washer includes a sealing portion 241 and a bushing portion 242. The sealing portion 241 is disposed between the ends of the second connecting pipe 22 and the ceramic pipe 23, and the bushing portion 242 is disposed inside the ceramic pipe 23. The sealing portion 241 of the T-shaped sealing washer is extruded by the first connecting pipe 21 and the end face of the ceramic pipe 23 to achieve the sealing between the ceramic pipe 23 and the first connecting pipe 21. The bushing portion 242 is disposed inside the ceramic pipe 23, and together with the sealing portion 241, completely covers the end of the ceramic pipe 23 to protect the end of the ceramic pipe 23 and further prevent the ceramic pipe 23 from being damaged during installation. At the same time, after the bushing portion 242 is installed, it positions the entire second sealing washer 25, avoiding possible unreliable sealing due to the offset and deformation of the sealing portion, and further ensuring the reliability of the sealing.

[0070] Embodiment 2

[0071] As Figures 5 to 7 shown in the figure, this embodiment provides a large-capacity battery. The large-capacity battery 1 includes a housing 11 and a plurality of single cells 12 arranged in the same direction and placed inside the housing 11. The single cells 12 in this embodiment are square-shell batteries, and the quantity can be adjusted according to actual requirements. The inner cavity of each single cell 12 includes an electrolyte region and a gas region. After the plurality of single cells 12 are arranged in the same direction and placed inside the housing 11, avoidance holes are provided on the top plate of the housing 11 corresponding to the polarity terminals 13 of each single cell 12. The polarity terminals 13 of each single cell 12 extend out of the corresponding avoidance holes to serve as the polarity terminals of the large-capacity battery (the polarity terminals of all the single cells on one side serve as the positive polarity terminals of the large-capacity battery, and the polarity terminals of all the single cells on the other side serve as the negative polarity terminals of the large-capacity battery). The area of the top plate of the housing 11 corresponding to the avoidance holes is fixedly sealed with the housing of the single cell 12.

[0072] It should be noted that the polarity terminal 13 of the single cell 12 here can be the pole column of the single cell 12. If it is to avoid the pole column of the single cell 12 as the polarity terminal 13 from not being able to smoothly extend out of the avoidance hole, a pole column adapter can also be connected to the pole column of the single cell 12, and the overall structure formed by the cooperation of the pole column of the single cell 12 and the pole column adapter is used as the polarity terminal 13 of the single cell 12.

[0073] As Figure 5 shown in the figure, the inner cavity of the above housing 11 and the inner cavity of each single cell 12 are all communicated. The above-mentioned communication effect can be achieved by providing a shared chamber in the housing 11 and making the inner cavity of the shared chamber communicate with the inner cavities of all the single cells 12.

[0074] The above-mentioned shared chamber can be at least one of an electrolyte shared chamber 112 and a gas shared chamber 111.

[0075] The inner cavity of the electrolyte sharing chamber 112 is in communication with the electrolyte regions in the inner cavities of all the single cells 12. Through the electrolyte sharing chamber 112, each single cell 12 can be in a unified electrolyte environment, ensuring the uniformity of the electrolyte in each single cell 12 and improving the performance and charge-discharge cycle life of the large-capacity battery 1. In this embodiment, the electrolyte sharing chamber 112 is a liquid channel provided between the bottom plate of the outer shell 11 and the bottoms of the respective single cells 12.

[0076] The inner cavity of the gas sharing chamber 111 is in communication with the gas regions in the inner cavities of all the single cells 12. Through the gas sharing chamber 111, the gas balance of each single cell 12 is achieved, which can also improve the performance and charge-discharge cycle life of the large-capacity battery 1. In this embodiment, the gas sharing chamber 111 is a gas channel provided on the top plate of the outer shell 11. At this time, the top plate of the outer shell 11 is provided with a protrusion extending along the arrangement direction of the single cells 12, and a gas channel is formed at the protrusion part.

[0077] The above sharing chamber can also be a gas-liquid sharing chamber. The inner cavity of the gas-liquid sharing chamber is in communication with both the electrolyte region and the gas region in the inner cavities of all the single cells 12. Through one gas-liquid sharing chamber, each single cell 12 can be in a unified electrolyte environment and gas environment, improving the performance and charge-discharge cycle life of the large-capacity battery 1.

[0078] As Figure 2 and Figure 5 shown, in order to lead out the thermal runaway flue gas from the inner cavity of the outer shell 11 of the above large-capacity battery 1, a venting port 113 communicating with the inner cavity of the outer shell 11 is provided on the outer shell 11 in this embodiment; usually, the venting port 113 is in communication with the above sharing chamber. A venting connection assembly 2 in Embodiment 1 is connected to the venting port 113, and the venting connection assembly 2 directs the thermal runaway flue gas generated by thermal runaway of any single cell 12 in the large-capacity battery 1 into the venting manifold 3, avoiding potential safety hazards of combustion or explosion of the large-capacity battery 1.

[0079] As Figure 6 shown, in this embodiment, a clamping part is formed at the part where the polar terminal 13 of the single cell 12 extends out of the avoidance hole. The clamping part in this embodiment is a through groove or a through hole, and the heat transfer tube 14 is fixed in the through groove or the through hole. When the temperature of the large-capacity battery 1 is higher than the set threshold, the large-capacity battery 1 is cooled by introducing a heat transfer medium with a lower temperature into the heat transfer tube 14; when the temperature of the large-capacity battery 1 is lower than the set threshold, the large-capacity battery 1 is heated by introducing a heat transfer medium with a higher temperature into the heat transfer tube 14; by controlling the temperature of the heat transfer medium, it can be ensured that the large-capacity battery 1 always operates at a normal working temperature.

[0080] As Figure 7As shown, in order to prevent safety problems caused by condensation on the heat transfer tube 14, in this embodiment, an insulating and sealing adhesive layer can also be laid on the top plate of the outer casing 11. Partial areas of the polar terminals 13 of each single battery 12 are covered by the insulating and sealing adhesive layer, and the electrical connection parts (i.e., the upper end faces) of the polar terminals 13 of each single battery 12 protrude from the insulating and sealing adhesive layer and are connected to electrical connectors (based on the electrical connectors, parallel connection of each single battery 12 or series connection between multiple large-capacity batteries 1 can be achieved); the main part of the heat transfer tube 14 is covered by the insulating and sealing adhesive layer, and the liquid inlet end and the liquid outlet end of the heat transfer tube 14 protrude from the insulating and sealing adhesive layer for connection with the liquid cooling device.

[0081] The above-mentioned polar terminals 13 are directly exposed to the external environment, and there are relatively large potential safety hazards during use due to the energization of the polar terminals 13. Based on this, an insulating protective cover 15 is provided on the top of the large-capacity battery 1, thereby providing insulating protection for the polar terminals 13, avoiding potential safety hazards that may exist during the operation of the large-capacity battery 1 when the polar terminals 13 are exposed, and also avoiding the problem of short circuit of the large-capacity battery 1 caused by some foreign objects in the external environment falling into the position of the polar terminals 13, improving the safety of the large-capacity battery 1.

[0082] It should be noted that if the insulating protective cover 15 wraps all the polar terminals 13, it will cause difficulties in the electrical connection of such large-capacity batteries 1. Therefore, in this embodiment, a slit is opened on the side wall of the insulating protective cover 15, and through this slit, the electrical connector can be connected to the polar terminal 13, thereby realizing electrical connection. It should also be noted that channels for the liquid inlet end and the liquid outlet end of the heat transfer tube 14 to protrude need to be opened on the side wall of the insulating protective cover 15.

[0083] Embodiment 3

[0084] As Figure 9 and Figure 10 shown, this embodiment provides a battery cluster, which includes at least two large-capacity batteries 1 in Embodiment 2. In order to prevent the hot runaway flue gas of the single battery 12 in an individual large-capacity battery 1 from spreading to the entire container and causing safety hazards. In this embodiment, the explosion vent connection assemblies 2 of all the large-capacity batteries 1 in the battery cluster are connected by an explosion vent manifold 3. After connection, one end of the explosion vent manifold 3 is sealed and the other end is open, serving as the hot runaway flue gas discharge port of the battery cluster. When the single battery 12 in any large-capacity battery 1 in the battery cluster undergoes thermal runaway, the hot runaway flue gas can be discharged through the explosion vent manifold 3, reducing the risk of combustion or explosion of the large-capacity battery 1 and the battery cluster.

[0085] When the above-mentioned explosion vent manifold 3 is connected to the explosion vent connection assembly 2, the following structure can be specifically adopted:

[0086] First, the explosion vent manifold 3 is of a spliced structure, suitable for the structure where the second connecting pipe 22 is a tee pipe;

[0087] As Figure 8 and Figure 9 shown, the second connecting pipes 22 of adjacent large-capacity batteries 1 are connected through flexible pipe sections 31 to form an explosion relief manifold 3. The second connecting pipe 22 includes a horizontal pipe and a vertical pipe section. Among them, the vertical pipe section is fixedly connected to the ceramic pipe 23, that is, the first interface of the tee pipe is hermetically connected to the ceramic pipe 23, and the horizontal pipe section is connected to both ends of the flexible pipe section 31 by welding or screwing, that is, the second interface and the third interface are respectively connected to the flexible pipe section 31. The flexible pipe section 31 can specifically adopt a metal bellows, which has certain flexibility while being heat-resistant. After the explosion relief manifold 3 is formed by the flexible pipe section 31, the installation accuracy requirements for the explosion relief connection assembly 2 of each large-capacity battery 1 are relatively small. The installation deviation of the explosion relief connection assembly 2 can be compensated by the deformation of the flexible pipe section 31, reducing the installation difficulty of the explosion relief manifold 3.

[0088] The assembly process of the explosion relief manifold 3 of this structure and the explosion relief connection assembly 2 is as follows:

[0089] First, arrange the large-capacity batteries 1 provided with the first connecting pipes 21 in sequence, embed the first sealing washer 24 into the ceramic pipe 23, and then rotate the ceramic pipe 23 to realize the connection between the ceramic pipe 23 and the first connecting pipes 21 of each large-capacity battery 1;

[0090] Second, sleeved the second sealing washer 25 on the end of the ceramic pipe 23, and then connect the vertical pipe section of the second connecting pipe 22 to the ceramic pipe 23;

[0091] Finally, connect the horizontal pipe sections of the second connecting pipe 22 to both ends of the flexible pipe section 31 by welding or screwing;

[0092] In the above-mentioned spliced explosion relief manifold 3, part of the pipe section of the explosion relief manifold 3 is the flexible pipe section 31. Based on the deformation of the flexible pipe section 31, the installation error of the explosion relief connection assembly 2 and the spacing deviation of the large-capacity batteries 1 can be compensated, reducing the installation difficulty of the explosion relief manifold 3;

[0093] Second, the explosion relief manifold 3 is a whole pipe structure, which is suitable for the structure where the second connecting pipe 22 is a flexible hollow pipe fitting;

[0094] As Figure 10 shown, the explosion relief manifold 3 includes a main pipe 32 and a plurality of branch pipes 33 arranged on the main pipe 32; the plurality of branch pipes 33 are respectively connected to the flexible hollow pipe fittings in each large-capacity battery 1 one by one, and the flexible hollow pipe fitting and the branch pipe 33 of the explosion relief manifold 3 can be connected by welding or screwing.

[0095] When the explosion relief manifold 3 of this structure is assembled with the explosion relief connection assembly 2,

[0096] First, arrange the large-capacity batteries 1 equipped with the first connecting pipes 21 in sequence, embed each first sealing washer 24 into the ceramic pipe 23, and then rotate the ceramic pipe 23 to connect the ceramic pipe 23 with the first connecting pipes 21 of each large-capacity battery 1;

[0097] Secondly, fit the second sealing washer 25 on the end of the ceramic pipe 23, and then connect the second connecting pipe 22 to the ceramic pipe 23;

[0098] Finally, connect the second connecting pipe 22 to the branch pipe 33 of the explosion relief manifold pipe 3 by welding or screwing.

[0099] In this connection structure, the flexible hollow pipe fittings are used to connect with the non-spliced ​​whole explosion relief manifold pipe 3, and the requirements for the installation accuracy of the explosion relief connection components 2 of each large-capacity battery 1 and the spacing deviation between the large-capacity batteries 1 are relatively small. The installation deviation of the explosion relief connection components 2 and the spacing deviation between the large-capacity batteries 1 can be compensated by the deformation of the flexible hollow pipe fittings, reducing the installation difficulty between it and the explosion relief manifold pipe 3. At the same time, the non-spliced ​​whole explosion relief manifold pipe 3 is adopted, which reduces the risk of liquid leakage to a certain extent compared with the spliced ​​explosion relief manifold pipe 3.

Claims

1. An explosion relief connection assembly, characterized in that: It includes a first connecting pipe, a second connecting pipe and a connecting assembly; The first connecting tube is used to connect to the explosion vent of the large-capacity battery, and an explosion vent membrane is provided in the first connecting tube or in the explosion vent of the large-capacity battery, and the second connecting tube is used to connect to the explosion vent manifold; The connection assembly includes a ceramic tube, a first sealing gasket and a second sealing gasket; One end of the ceramic tube is threadedly connected to the first connecting tube, and a first sealing gasket is provided at the connection between the first connecting tube and the ceramic tube to achieve sealing between the first connecting tube and the ceramic tube; The other end of the ceramic tube is threadedly connected to the second connecting tube, and a second sealing gasket is arranged at the connection between the second connecting tube and the ceramic tube to achieve sealing between the second connecting tube and the ceramic tube.

2. The explosion relief connection assembly according to claim 1, characterized in that: One end of the ceramic tube connected to the second connecting tube is provided with an external thread; the second sealing gasket is a T-shaped sealing gasket, including a sealing part and a bushing part, the sealing part is arranged at the end of the ceramic tube, and the bushing part is arranged inside the ceramic tube.

3. The explosion relief connection assembly according to claim 1, characterized in that: The first sealing gasket and the second sealing gasket are polytetrafluoroethylene gaskets or gaskets made of PEEK.

4. The explosion relief connection assembly according to any one of claims 1 to 3, characterized in that: An annular limiting boss is provided on the first connecting tube, and the annular limiting boss is used to cooperate with the explosion vent of the large-capacity battery to achieve fixed connection of the first connecting tube.

5. The explosion relief connection assembly according to claim 4, characterized in that: The second connecting pipe is a three-way pipe, a first interface of which is connected to the ceramic pipe, and a second interface and a third interface are respectively used to connect to the flexible pipe section constituting the explosion-relief manifold.

6. The explosion relief connection assembly according to claim 4, characterized in that: The second connecting pipe is a flexible hollow pipe, one end of which is connected to the ceramic pipe, and the other end of which is used to be connected to the explosion-relief manifold.

7. A large capacity battery, characterized in that: It comprises a shell and a plurality of single cells arranged in the shell in the same direction; a shared chamber is provided in the shell, and the inner cavity of the shared chamber is connected to the inner cavities of all the single cells; an explosion vent is provided on the shell, and the explosion vent is connected to the explosion vent connection assembly according to any one of claims 1 to 6.

8. The large-capacity battery according to claim 7, characterized in that: The top plate of the shell is provided with avoidance holes corresponding to the polarity terminals of each single cell; each single cell polarity terminal extends out of the avoidance holes, and the top plate area of ​​the shell corresponding to the avoidance holes is fixedly sealed with the single cell shell; a clamping part is provided at the part where each single cell polarity terminal extends out of the avoidance holes; the heat transfer tube is fixed on the clamping part of each single cell polarity terminal, and the heat transfer tube is insulated from each single cell.

9. A battery cluster, characterized in that: It comprises an explosion venting manifold and n large-capacity batteries as described in claim 7 or 8, wherein n is an integer greater than 1; the second connecting tubes of the large-capacity batteries are all connected to the explosion venting manifold, one end of the explosion venting manifold is sealed, and the other end is open, serving as a thermal runaway smoke exhaust outlet for the battery cluster.

10. The battery cluster according to claim 9, characterized in that: The second connecting pipe is a three-way pipe, and the second connecting pipes of adjacent large-capacity batteries are connected through a flexible pipe section to form an explosion-relief manifold.

11. The battery cluster according to claim 9, characterized in that: The second connecting pipe is a flexible hollow pipe, and the explosion-relief manifold comprises a main pipe and n branch pipes arranged on the main pipe; the n branch pipes are connected to the second connecting pipes of the n large-capacity batteries in a one-to-one correspondence.

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