Battery device, energy storage device, energy storage system and charging network

Abstract

The embodiment of the utility model discloses a battery device, an energy storage device, an energy storage system and a charging network. The battery device comprises: a plurality of battery cells, each battery cell being provided with a pressure relief mechanism; and the discharge pipeline is provided with a plurality of pressure relief holes which are in one-to-one correspondence with the pressure relief mechanisms of the plurality of battery monomers, so that emissions discharged from the pressure relief mechanisms enter the discharge pipeline through the pressure relief holes and are discharged through the discharge pipeline, and the discharge pipeline comprises a buffer part. According to the battery device, the energy storage device, the energy storage system and the charging network, the reliability and the stability of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery device, an energy storage device, an energy storage system, and a charging network. Background Technology

[0002] With the continuous advancement of battery technology, various new energy industries that use battery devices as energy storage equipment have developed rapidly. In the development of battery technology, in addition to improving the performance of battery devices, how to improve the structural stability of battery devices during assembly and use is also an issue that cannot be ignored. Utility Model Content

[0003] This application provides a battery device, an energy storage device, an energy storage system, and a charging network, which can improve the reliability and stability of the battery device.

[0004] In a first aspect, a battery device is provided, comprising: a plurality of battery cells, each battery cell being provided with a pressure relief mechanism; and a discharge pipeline, the discharge pipeline being provided with a plurality of pressure relief holes corresponding one-to-one with the pressure relief mechanisms of the plurality of battery cells, such that emissions discharged from the pressure relief mechanisms enter the discharge pipeline through the pressure relief holes and are discharged through the discharge pipeline, the discharge pipeline including a buffer section.

[0005] Therefore, in the battery device of this application embodiment, when a single battery cell experiences thermal runaway, a pressure relief mechanism is activated, and the battery cell discharges emissions through the pressure relief mechanism. These emissions enter a discharge pipe through a pressure relief hole and are then discharged through the discharge pipe. By using the same discharge pipe to correspond to multiple battery cells, when any of these battery cells experiences thermal runaway, the emissions from those battery cells can be collected through this discharge pipe, simplifying the structure and reducing the structural complexity of the battery device.

[0006] Furthermore, during the assembly of the battery device, considering that multiple battery cells may be arranged along the same discharge pipe, and that there may be tolerances between these cells in the length, width, or height directions, a buffer section in the discharge pipe can absorb these tolerances, improving the assembly efficiency of the battery device. During the use of the battery device, the multiple battery cells corresponding to the same discharge pipe may deform or shift. The buffer section in the discharge pipe can absorb this deformation, increasing the rigidity of the discharge pipe, allowing it to better withstand external forces, improving its bending resistance, compression resistance, and vibration resistance, reducing the risk of damage or even breakage due to deformation, and thus improving the stability and reliability of the battery device.

[0007] In some embodiments, the discharge pipeline further includes a straight section, and the pressure relief hole is located in the straight section, making the pressure relief hole relatively flat. This facilitates the processing of the pressure relief hole and improves the sealing around the pressure relief hole, reducing the risk of the discharge material leaking from around the pressure relief hole to the outside of the discharge pipeline. This allows the discharge material to be collected and discharged in a directional manner through the discharge pipeline, thereby reducing the impact of the high-temperature and high-pressure discharge material on other components of the battery device.

[0008] In some embodiments, the buffer portion includes a groove structure close to the battery cell relative to the straight portion and / or a protrusion structure away from the battery cell relative to the straight portion. The buffer portion, including the groove structure and / or the protrusion structure, has a simple structure, is easy to manufacture, and facilitates the absorption of dimensional differences and deformation between battery cells. This improves the bending resistance, compression resistance, or vibration resistance of the discharge pipeline, reduces the risk of damage or even breakage of the discharge pipeline due to deformation, and thus improves the stability and reliability of the battery device.

[0009] In some embodiments, the pressure relief hole is located on the first wall of the discharge pipe, and the first wall is provided with the buffer portion. Considering that there is usually a certain gap between the discharge pipe and the battery cell, the buffer portion is provided on the first wall where the pressure relief hole is located. This buffer portion can be disposed in the gap between the discharge pipe and the battery cell. When the buffer portion includes a groove structure and / or a protrusion structure, it does not require additional space, thus improving the space utilization of the battery device and consequently increasing the energy density of the battery device. Furthermore, during the relative fixing process between the pressure relief hole and the pressure relief mechanism, the buffer portion of the first wall can more effectively absorb any tolerances that may exist between multiple battery cells in the length, width, or height directions, thereby improving the processing efficiency of the battery device.

[0010] In some embodiments, the first wall is provided with a plurality of buffer portions, each of which corresponds to the area between two adjacent battery cells. These buffer portions can be used to better absorb the deformation of adjacent battery cells during use, and to better absorb possible tolerances in the length, width, or height directions of adjacent battery cells during assembly, thereby improving the reliability of the discharge pipeline.

[0011] In some embodiments, the buffer portion of the first wall corresponds one-to-one with the area between each two adjacent battery cells in the plurality of battery cells, so that the buffer portion of the first wall of the discharge pipeline is provided more uniformly. For example, the buffer portion and the pressure relief hole are distributed at intervals, so that the stress on different areas of the first wall of the discharge pipeline is more uniform, improving its structural strength and stability, thereby improving the reliability of the battery device.

[0012] In some embodiments, the buffer portion of the first wall includes a groove structure protruding from the flat portion near the battery cell. This groove structure protrudes towards the battery cell relative to the flat portion, and can occupy the gap between the discharge pipe and the battery cell without occupying any other additional space within the battery device; it can also increase the space inside the discharge pipe, facilitating faster emission of pollutants and thus improving the reliability of the battery device.

[0013] In some embodiments, the discharge pipeline further includes a second wall disposed opposite to the first wall, the second wall being provided with the buffer portion. Considering the limited area of ​​the first wall excluding the pressure relief hole, further providing a buffer portion on the second wall of the discharge pipeline can increase the number of buffer portions. This can effectively absorb the deformation of multiple battery cells and better increase the rigidity of the discharge pipeline, enabling it to better withstand external forces, improve the bending resistance, compression resistance, or vibration resistance of the discharge pipeline, reduce the risk of damage or even breakage of the discharge pipeline due to deformation, and thus improve the stability and reliability of the battery device.

[0014] In some embodiments, the buffer portion of the second wall is disposed opposite to the buffer portion of the first wall, such that for each buffer portion disposed on the first wall, a corresponding buffer portion is also disposed on the second wall. This makes the buffer portions of the discharge pipeline more symmetrical and the stress more even. Furthermore, both the buffer portions of the second wall and the buffer portions of the first wall can be used to better absorb the deformation of two adjacent battery cells during battery cell use, and to better absorb possible tolerances between adjacent battery cells in the length, width, or height directions during battery cell assembly, thereby improving the reliability of the discharge pipeline.

[0015] In some embodiments, the buffer portion of the second wall includes a groove structure that is close to the battery cell relative to the straight portion. Considering that the second wall of the discharge pipe is far from the battery cell, providing a buffer portion with a groove structure ensures that the groove structure does not occupy space outside the discharge pipe, thereby reducing the space occupied by the buffer portion inside the battery device and improving the space utilization rate of the battery device.

[0016] In some embodiments, the shape of the buffer portion of the second wall is the same as that of the buffer portion of the first wall, so that the buffer portions of the second wall and the buffer portions of the first wall maintain synergy, which is not only convenient for processing, but also beneficial for absorbing expansion forces and tolerances. During the process, the different areas of the discharge pipeline are subjected to more uniform stress, reducing stress concentration, thereby improving the structural strength and stability of the discharge pipeline.

[0017] In some embodiments, the buffer portion includes a groove structure close to the battery cell relative to the straight portion; wherein, along the axial direction of the discharge pipe, the maximum length of the buffer portion ranges from [2mm, 200mm], and / or, the maximum depth of the groove structure ranges from [1mm, 40mm]. Setting the maximum length of the buffer portion to be greater than or equal to 2mm can improve the effect of the buffer portion in absorbing expansion force and tolerance, thereby improving the structural strength and stability of the discharge pipe. However, due to the limited size of the battery cell and the limited distance between multiple battery cells, the maximum length of the buffer portion is usually set to be less than or equal to 200mm to reduce the space occupied by the buffer portion and facilitate the setting of pressure relief holes in the straight portion. Setting the maximum depth of the groove structure to be greater than or equal to 1mm can improve the effect of the buffer portion in absorbing expansion force and tolerance, especially beneficial for absorbing tolerance and pressure in the direction perpendicular to the first wall, and also beneficial for storing more electrolyte and dust in the discharge, thereby improving the structural strength and reliability of the discharge pipe. However, the space between the discharge pipe and the battery cell is limited. Therefore, the maximum depth of the groove structure is usually less than or equal to 40mm to reduce the impact of the groove structure on the battery cell, reduce the risk of interference between the groove structure and the battery cell, and thus improve the structural stability and reliability of the battery device.

[0018] In some embodiments, the longitudinal section of the buffer portion is either arc-shaped or polygonal, wherein the longitudinal section of the buffer portion is perpendicular to the width direction of the discharge pipeline. The arc shape makes the bottom surface of the buffer portion rounded, reducing stress concentration and improving the structural stability and reliability of the discharge pipeline; while the polygonal shape is easier to process.

[0019] In some embodiments, the pressure relief mechanism is located on the top or side wall of the battery cell along the direction of gravity, and correspondingly, the discharge pipe is provided on the top or side of multiple battery cells to facilitate the installation of the discharge pipe.

[0020] In some embodiments, the battery cell further includes a first limiting portion surrounding the pressure relief mechanism and disposed on the outer surface of the battery cell. The battery device further includes a plurality of second limiting portions, each corresponding to one of the pressure relief holes. Each second limiting portion surrounds a corresponding pressure relief hole, and the first and second limiting portions cooperate to allow emissions discharged from the pressure relief mechanism to enter the discharge pipeline through the pressure relief hole. In the event of thermal runaway of the battery cell, the pressure relief mechanism is activated, and the battery cell discharges emissions through the pressure relief mechanism. The emissions pass through the cooperating first and second limiting portions and enter the discharge pipeline through the second through hole, whereby the emissions can be collected and discharged by the discharge pipeline to reduce the impact of the high-temperature, high-pressure emissions on other components of the battery device.

[0021] In a second aspect, an energy storage device is provided, comprising: a plurality of battery devices as described in the first aspect or any one of the embodiments of the first aspect, the battery devices being used to store or provide electrical energy.

[0022] Thirdly, an energy storage system is provided, comprising: a power conversion device; and the battery device described in the second aspect, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

[0023] Fourthly, a charging network is provided, comprising: a charging pile; an energy storage device as described in the second aspect or an energy storage system as described in the third aspect, wherein the energy storage device or the energy storage system is used to provide electrical energy to the charging pile. Attached Figure Description

[0024] Figure 1 This is an exploded view of a battery device according to an embodiment of this application;

[0025] Figure 2 This is a partial structural diagram of a battery device according to an embodiment of this application;

[0026] Figure 3 This is an exploded view of a partial structure of a battery device according to an embodiment of this application;

[0027] Figure 4 This is a top view schematic diagram of a partial structure of a battery device according to an embodiment of this application;

[0028] Figure 5 This is a cross-sectional schematic diagram of a partial structure of a battery device according to an embodiment of this application;

[0029] Figure 6 This is a cross-sectional schematic diagram of a partial structure of a battery device according to another embodiment of this application;

[0030] Figure 7 This is a cross-sectional schematic diagram of a partial structure of a battery device according to another embodiment of this application;

[0031] Figure 8 This is a cross-sectional schematic diagram of a partial structure of an emission pipeline according to an embodiment of this application;

[0032] Figure 9 This is a cross-sectional schematic diagram of a partial structure of an emission pipeline according to another embodiment of this application;

[0033] Figure 10 This is a cross-sectional schematic diagram of a partial structure of an emission pipeline according to another embodiment of this application;

[0034] Figure 11 This is a side view of a partial structure of a battery device according to an embodiment of this application;

[0035] Figure 12 This is a cross-sectional schematic diagram of a partial structure of a battery device according to an embodiment of this application;

[0036] Figure 13 This is an exploded view of a partial structure of the discharge pipeline and the second limiting part according to an embodiment of this application;

[0037] Figure 14 This is a cross-sectional schematic diagram of a partial structure of a battery device according to another embodiment of this application;

[0038] Figure 15 This is a schematic diagram of the structure of the second limiting part according to an embodiment of this application;

[0039] Figure 16 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0040] Figure 17 This is an exploded view of the casing of a battery cell according to one embodiment of this application;

[0041] Figure 18 This is a schematic diagram of the structure of the storage chamber of an energy storage device according to an embodiment of this application;

[0042] Figure 19 This is a schematic diagram of the structure of multiple battery devices housed in a compartment according to an embodiment of this application;

[0043] Figure 20 This is a structural block diagram of an energy storage system according to an embodiment of this application;

[0044] Figure 21 This is a structural block diagram of a charging network according to an embodiment of this application.

[0045] The accompanying drawings are not drawn to scale. Detailed Implementation

[0046] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0049] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0053] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0054] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0055] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0056] In some embodiments, a pressure relief mechanism is provided on the casing of the battery cell. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0057] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby creating an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0058] When a battery cell experiences thermal runaway or other abnormal conditions, high-temperature, high-pressure emissions are generated inside the cell. Current pressure relief mechanism designs primarily focus on releasing the high pressure and heat inside the battery cell, i.e., venting the emissions to the outside. However, how to properly dissipate these high-temperature, high-pressure emissions after they leave the battery cell in a way that minimizes the risk of further damage to the battery system remains a pressing issue that needs to be addressed.

[0059] This application provides a battery device, energy storage device, energy storage system, and charging network that can solve the aforementioned problems. The battery device of this application includes multiple battery cells and a discharge pipeline. Each battery cell is equipped with a pressure relief mechanism, and the discharge pipeline corresponds to the pressure relief mechanisms of the multiple battery cells. The discharge pipeline includes pressure relief holes corresponding one-to-one with the pressure relief mechanisms of the multiple battery cells. Thus, in the event of thermal runaway in a battery cell, the pressure relief mechanism is activated, and the battery cell discharges emissions through the pressure relief mechanism. These emissions enter the discharge pipeline through the pressure relief holes and are discharged through the discharge pipeline. This reduces the risk of emissions leaking outside the discharge pipeline, allowing the emissions to be collected and directed through the discharge pipeline, thereby reducing the impact of the high-temperature, high-pressure emissions on other components of the battery device. For example, considering that the high-temperature, high-pressure emissions may include conductive particles, these particles may cause short circuits between multiple components of the battery device, leading to further fire or explosion. Therefore, reducing emissions leaking outside the discharge pipeline can reduce further impact on the battery device, lower the risk of explosion, and improve the reliability and stability of the battery device. Furthermore, by setting up the same discharge pipeline for multiple battery cells, when any of the multiple battery cells experiences thermal runaway, the emissions from the battery cells can be collected through the discharge pipeline, simplifying the structure and reducing the structural complexity of the battery device.

[0060] Furthermore, the discharge pipeline includes a buffer section. During the assembly of the battery device, considering that multiple battery cells may be arranged along the same discharge pipeline, and that there may be tolerances between these multiple battery cells in the length, width, or height directions, the buffer section in the discharge pipeline can absorb these tolerances, improving the assembly efficiency of the battery device. During the use of the battery device, the multiple battery cells corresponding to the same discharge pipeline may deform or shift. The buffer section in the discharge pipeline can also absorb this deformation, increasing the rigidity of the discharge pipeline, enabling it to better withstand external forces, improving the bending resistance, compression resistance, or vibration resistance of the discharge pipeline, reducing the risk of damage or even breakage due to deformation, and thus improving the stability and reliability of the battery device.

[0061] Figure 1 An exploded view of the battery device 10 according to an embodiment of this application is shown. Figure 1As shown, the battery device 10 of this embodiment includes a housing 11, which can be used to accommodate at least one battery cell 20. The housing 11 of this embodiment has a hollow internal structure, and at least one battery cell 20 is accommodated within the housing 11. Specifically, the housing 11 includes a first housing portion 111 and a second housing portion 112, which are sealed together. For example, the first housing portion 111 and the second housing portion 112 can be snapped together to form a hollow structure. The shape of the first housing portion 111 and the second housing portion 112 can be determined according to the shape of the components accommodated internally, for example, it can be determined according to the shape of a combination of multiple battery cells 20 accommodated internally.

[0062] In the embodiments of this application, at least one of the first housing portion 111 and the second housing portion 112 has an opening. For example, as Figure 1 As shown, the first box portion 111 and the second box portion 112 can both be hollow cuboids with one face as an opening. The openings of the first box portion 111 and the second box portion 112 are arranged opposite to each other, and the first box portion 111 and the second box portion 112 are interlocked to form a box 11 with a closed chamber, which can be used to accommodate at least one battery cell 20.

[0063] For example, unlike Figure 1 As shown, only one of the first housing portion 111 and the second housing portion 112 may be a hollow cuboid with an opening, while the other may be plate-shaped to cover the opening. Taking the first housing portion 111 as a hollow cuboid with one opening and the second housing portion 112 as a plate-shaped example, the second housing portion 112 is used to cover the opening of the first housing portion 111 to form a housing 11 with a closed chamber, which can be used to accommodate at least one battery cell 20.

[0064] like Figure 1 As shown, for ease of explanation, this application embodiment defines three directions: the length direction X of the battery device 10, the width direction Y of the battery device 10, and the height direction Z of the battery device 10. The length direction X, the width direction Y, and the height direction Z are perpendicular to each other, and the size of the battery device 10 in the length direction X is greater than the size in the width direction Y.

[0065] Figure 2 A partial structural schematic diagram of the battery device 10 according to an embodiment of this application is shown, for example, Figure 2 It can be Figure 1 A partial structural schematic diagram of the battery device 10 shown; Figure 3 An exploded view of a partial structure of the battery device 10 according to an embodiment of this application is shown, for example, Figure 3 It can be Figure 2An exploded view of a portion of the structure of the battery device 10 shown; Figure 4 A top view schematic diagram of a partial structure of the battery device 10 according to an embodiment of this application is shown, for example, Figure 4 It can be Figure 2 and Figure 3 A top view of a partial structure of the battery device 10 shown; Figure 5 A cross-sectional schematic diagram of a partial structure of the battery device 10 according to an embodiment of this application is shown, for example, Figure 5 It can be along Figure 4 The cross-sectional view along the A-A' direction is shown.

[0066] like Figures 2 to 5 As shown, the battery device 10 of this application embodiment includes a plurality of battery cells 20 and an exhaust pipe 12. For example, the plurality of battery cells 20 and the exhaust pipe 12 can be accommodated in the housing 11.

[0067] In this embodiment, the battery cell 20 is provided with a pressure relief mechanism 213; the discharge pipe 12 is provided with a plurality of pressure relief holes 1221 corresponding one-to-one with the pressure relief mechanisms 213 of the plurality of battery cells 20, so that the discharge from the pressure relief mechanism 213 enters the discharge pipe 12 through the pressure relief holes 1221 and is discharged through the discharge pipe 12. The discharge pipe 12 includes a buffer section 121.

[0068] The battery device 10 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 20, which are connected in series, parallel, or mixed connections via a busbar.

[0069] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 20.

[0070] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 20 into a single module. As an example, the battery module can be formed by bundling multiple battery cells 20 together with cable ties.

[0071] In some embodiments, the battery device 10 may be a battery pack, which includes a housing 11 and one or more battery cell assemblies housed within the housing 11. As an example, the battery cell assembly may be a battery module, which can be housed within the housing 11 by securing the battery module to the housing 11. Alternatively, the battery cell assembly may be housed within the housing 11 by directly securing multiple battery cells 20 to the housing 11.

[0072] The battery cell 20 in this application embodiment can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 20 of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application has no particular limitations.

[0073] The battery cell 20 in this embodiment is provided with a pressure relief mechanism 213, which is used to discharge internal gas from the battery cell 20. The pressure relief mechanism 213 can be located on any wall of the battery cell 20. As an example, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure relief mechanism 213 is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism 213 performs an action or a weak structure provided in the pressure relief mechanism 213 is destroyed, thereby forming an opening or channel for the release of internal pressure or temperature. This threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 20.

[0074] As an example, the pressure relief mechanism 213 can be integrally formed with the wall it is located on. As an example, the pressure relief mechanism 213 can also be separately installed and connected to the wall it is located on.

[0075] The term "actuation" as used in this application refers to the pressure relief mechanism 213 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The actions of the pressure relief mechanism 213 may include, but are not limited to: movement of components within the pressure relief mechanism 213 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 213, etc. When the pressure relief mechanism 213 is actuated, the high-temperature, high-pressure substances inside the battery cell 20 are discharged outwards from the actuated portion as exhaust materials. This method enables pressure and temperature relief of the battery cell 20 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0076] The emissions from the battery cell 20 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0077] In this embodiment, the discharge pipe 12 is configured to correspond to the pressure relief mechanism 213 of multiple battery cells 20. For example, the discharge pipe 12 can be located outside the wall of the battery cell 20 where the pressure relief mechanism 213 is provided, so that the discharge pipe 12 can collect the emissions from the battery cell 20. Furthermore, by configuring the same discharge pipe 12 to correspond to multiple battery cells 20, when any of the multiple battery cells 20 experiences thermal runaway, the emissions from the battery cell 20 can be collected through the discharge pipe 12, simplifying the structure and reducing the structural complexity of the battery device 10.

[0078] In this embodiment, the discharge pipe 12 is provided with multiple pressure relief holes 1221 corresponding one-to-one with the pressure relief mechanisms 213 of the multiple battery cells 20. In the event of thermal runaway of a battery cell, the pressure relief mechanism 213 is activated, and the battery cell 20 discharges emissions through the pressure relief mechanism 213. The emissions enter the discharge pipe 12 through the pressure relief holes 1221 and are discharged through the discharge pipe 12. The discharge pipe 12 enables the collection and directional discharge of emissions, thereby reducing the impact of the high-temperature and high-pressure emissions on other components of the battery device 10. For example, considering that the high-temperature and high-pressure emissions may include conductive particles, these particles may cause short circuits between multiple components of the battery device 10, leading to further fire or explosion. Therefore, reducing the leakage of emissions to the outside of the discharge pipe 12 can reduce further impact on the battery device 10, reduce the risk of explosion, and improve the reliability and stability of the battery device 10.

[0079] Furthermore, the discharge pipe 12 in this embodiment also includes a buffer section 121. During the assembly of the battery device 10, considering that multiple battery cells 20 may be provided corresponding to the same discharge pipe 12, and that there may be tolerances between these multiple battery cells 20 in the length, width, or height directions, the buffer section 121 provided by the discharge pipe 12 can absorb these tolerances, improving the assembly efficiency of the battery device 10. During the use of the battery device 10, the multiple battery cells 20 corresponding to the same discharge pipe 12 may deform or shift. The buffer section 121 provided by the discharge pipe 12 can absorb this deformation, increasing the rigidity of the discharge pipe 12, enabling it to better withstand external forces, improving the bending resistance, compression resistance, or vibration resistance of the discharge pipe 12, reducing the risk of damage or even breakage of the discharge pipe 12 due to deformation, and thus improving the stability and reliability of the battery device 10.

[0080] In some embodiments, the discharge pipe 12 further includes a straight section 122, with a pressure relief hole 1221 located in the straight section 122. The straight section 122 is located in the area of ​​the discharge pipe 12 other than the buffer section 121, and compared to the buffer section 121, the straight section 122 has a weaker ability to absorb deformation; for example, the straight section 122 is a relatively flat area of ​​the discharge pipe 12. For example, as... Figures 2 to 5 As shown, taking the height direction Z of the battery device 10 as the thickness direction of the wall where the pressure relief mechanism 213 of the battery cell 20 is located, the distance between different areas of the straight portion 122 and the wall of the battery cell 20 below where the pressure relief mechanism 213 is located is basically equal along the height direction Z of the battery device 10.

[0081] In this embodiment, the pressure relief hole 1221 is located in the straight section 122 of the discharge pipe 12, making the area where the pressure relief hole 1221 is located relatively flat. This facilitates the processing of the pressure relief hole 1221 and improves the sealing around the pressure relief hole 1221, reducing the risk of the discharge material leaking from around the pressure relief hole 1221 to the outside of the discharge pipe 12. This allows the discharge material to be collected and discharged in a directional manner through the discharge pipe 12, thereby reducing the impact of the high-temperature and high-pressure discharge material on other components of the battery device 10.

[0082] In some embodiments, the discharge pipe 12 may include at least one buffer section 121. Wherein, if the discharge pipe 12 includes at least one buffer section 121 and a plurality of straight sections 122, the at least one buffer section 121 may be alternately arranged with the plurality of straight sections 122, that is, each buffer section 121 is located between two straight sections 122.

[0083] It should be understood that the buffer section 121 in the embodiments of this application can be implemented in a variety of ways.

[0084] In some embodiments, the buffer portion 121 includes a groove structure 1211 that is close to the battery cell 20 relative to the flat portion 122 and / or a protrusion structure 1212 that is far away from the battery cell 20 relative to the flat portion 122. For example, as Figures 2 to 5As shown, taking the height direction Z of the battery device 10 as the thickness direction of the wall where the pressure relief mechanism 213 of the battery cell 20 is located as an example, along the height direction Z of the battery device 10, the distance between different areas of the buffer part 121 and the wall of the lower battery cell 20 where the pressure relief mechanism 213 is located can be different. Furthermore, the distance between the buffer part 121 and the wall of the lower battery cell 20 where the pressure relief mechanism 213 is located is different from the distance between the straight part 122 and the wall of the lower battery cell 20 where the pressure relief mechanism 213 is located. For example, the buffer portion 121 may include a groove structure 1211, in which case the distance between the buffer portion 121 and the wall of the lower battery cell 20 where the pressure relief mechanism 213 is provided is less than the distance between the flat portion 122 and the wall of the lower battery cell 20 where the pressure relief mechanism 213 is provided; or, the buffer portion 121 may include a protrusion structure 1212, in which case the distance between the buffer portion 121 and the wall of the lower battery cell 20 where the pressure relief mechanism 213 is provided is greater than the distance between the flat portion 122 and the wall of the lower battery cell 20 where the pressure relief mechanism 213 is provided.

[0085] The buffer section 121 includes a groove structure 1211 and / or a protrusion structure 1212. The structure is simple, easy to process, and facilitates the absorption of dimensional differences and deformation between battery cells 20. It can improve the bending resistance, compression resistance, or vibration resistance of the discharge pipe 12, reduce the risk of damage or even breakage of the discharge pipe 12 due to deformation, and thus improve the stability and reliability of the battery device 10.

[0086] The arrangement and location of the buffer section 121 in the embodiments of this application will now be described with reference to the accompanying drawings.

[0087] It should be understood that the buffer section 121 in this embodiment can be located at any position in the discharge pipe 12. For example, the position of the buffer section 121 can be set according to the position of the pressure relief hole 1221, so that the pressure relief hole 1221 is located in the straight section 122.

[0088] In some embodiments, the pressure relief hole 1221 is located on the first wall 123 of the discharge pipe 12, and the first wall 123 is provided with a buffer portion 121. Considering that there is usually a certain gap between the discharge pipe 12 and the battery cell 20, the buffer portion 121 is provided on the first wall 123 where the pressure relief hole 1221 is located. The buffer portion 121 can be provided in the gap between the discharge pipe 12 and the battery cell 20. When the buffer portion 121 includes a groove structure 1211 and / or a protrusion structure 1212, the buffer portion 121 does not need to occupy additional space, which can improve the space utilization of the battery device 10 and thus improve the energy density of the battery device 10. Furthermore, during the relative fixing process between the pressure relief hole 1221 and the pressure relief mechanism 213, the buffer portion 121 of the first wall 123 can effectively absorb the tolerances that may exist between multiple battery cells 20 in the length, width, or height directions, thereby improving the processing efficiency of the battery device 10.

[0089] It should be understood that the shape of the discharge pipe 12 in this embodiment can be set according to actual application. For example, the cross-sectional shape of the discharge pipe 12 can be circular, rectangular, rounded rectangle, oval or other polygonal, wherein the cross-section of the discharge pipe 12 is perpendicular to the axial direction of the discharge pipe 12.

[0090] For ease of description, such as Figures 2 to 5 As shown, this embodiment of the application mainly takes the cross-section of the discharge pipe 12 as approximately rectangular as an example, but this embodiment of the application is not limited to this. In this embodiment of the application, the first wall 123 is the wall of the discharge pipe 12 with the pressure relief hole 1221, that is, the first wall 123 is the wall of the discharge pipe 12 near the pressure relief mechanism 213.

[0091] It should be understood that the first wall 123 in this embodiment includes a straight portion 122 and a buffer portion 121, which can be located at any position between the pressure relief mechanisms 213 of two adjacent battery cells 20.

[0092] In some embodiments, the first wall 123 is provided with a plurality of buffer portions 121, each buffer portion 121 corresponding to the area between two adjacent battery cells 20. For example... Figures 2 to 5As shown, the buffer section 121 corresponds to the area between two adjacent battery cells 20. For example, taking the case where the pressure relief mechanism 213 of multiple battery cells 20 is in the same position, and correspondingly, the pressure relief holes 1221 of the discharge pipe 12 are evenly distributed, then each buffer section 121 can be located in the middle of two adjacent pressure relief holes 1221. In this way, the buffer section 121 can be used to better absorb the deformation of two adjacent battery cells 20 during the use of the battery cells 20, and to better absorb the possible tolerances in the length, width, or height directions of two adjacent battery cells 20 during the assembly of the battery cells 20, thereby improving the reliability of the discharge pipe 12.

[0093] In some embodiments, such as Figures 2 to 5 As shown, the buffer portion 121 included in the first wall 123 corresponds one-to-one with the area between each two adjacent battery cells 20 in the plurality of battery cells 20. For example, taking a plurality of battery cells 20 arranged along the length direction X of the battery device 10 as an example, for each two adjacent battery cells 20 in the plurality of battery cells 20, the plurality of areas correspond one-to-one with the plurality of buffer portions 121 included in the first wall 123, so that the buffer portions 121 of the first wall 123 of the discharge pipe 12 are arranged more evenly. For example, the buffer portions 121 and the pressure relief holes 1221 are distributed alternately, so that the stress on different areas of the first wall 123 of the discharge pipe 12 is more even, improving its structural strength and stability, and thus improving the reliability of the battery device 10.

[0094] In some embodiments, the buffer portion 121 included in the first wall 123 may correspond only to the area between some adjacent battery cells 20. For example, taking a plurality of battery cells 20 arranged along the length direction X of the battery device 10 as an example, for the area between each two adjacent battery cells 20, some areas of the plurality of battery cells 20 may be provided with a buffer portion 121, while other areas may not be provided with a buffer portion 121, so as to reduce the number of buffer portions 121, thereby reducing the weight of the discharge pipe 12 and the weight of the battery device 10.

[0095] In some embodiments, the buffer portion 121 of the first wall 123 includes a groove structure 1211 adjacent to the battery cell 20 relative to the flat portion 122. For example... Figures 2 to 5 As shown, the groove structure 1211 protrudes towards the battery cell 20 relative to the straight portion 122. The groove structure 1211 can occupy the gap between the discharge pipe 12 and the battery cell 20 without occupying other additional space inside the battery device 10. In addition, it can increase the space inside the discharge pipe 12, which facilitates faster discharge of pollutants and thus improves the reliability of the battery device 10.

[0096] In some embodiments, if the discharge pipe 12 is disposed on the top of the battery cell 20 along the direction of gravity, and the buffer portion 121 disposed on the first wall 123 includes a groove structure 1211, the groove structure 1211 can also be used to accumulate substances such as electrolyte and dust included in the emissions emitted by the battery cell 20 during thermal runaway. For example, the electrolyte and dust may accumulate in the groove structure 121 under the action of gravity in the emissions that enter the discharge pipe 12 through the pressure relief hole 1221. This can prevent these impurities from leaking to the outside of the discharge pipe 12, thereby causing the insulation withstand voltage failure of the internal components of the battery device 10.

[0097] In some embodiments, the discharge pipe 12 further includes a second wall 124 disposed opposite to the first wall 123, the second wall 124 being provided with a buffer portion 121. For example... Figures 2 to 5 As shown, considering that the area of ​​the first wall 123 other than the pressure relief hole 1221 is limited, a buffer part 121 is further provided on the second wall 124 of the discharge pipe 12. This can increase the number of buffer parts 121, which can effectively absorb the deformation of multiple battery cells 20 and better increase the rigidity of the discharge pipe 12, so that it can better withstand the external force, improve the bending resistance, compression resistance or vibration resistance of the discharge pipe 12, reduce the risk of damage or even breakage of the discharge pipe 12 due to deformation, and thus improve the stability and reliability of the battery device 10.

[0098] In some embodiments, the buffer portion 121 of the second wall 124 is disposed opposite to the buffer portion 121 of the first wall 123, such that for each buffer portion 121 disposed on the first wall 123, a corresponding buffer portion 121 is also disposed on the second wall 124. This results in a more symmetrical arrangement of the buffer portions 121 in the discharge pipe 12, leading to more uniform stress distribution. Furthermore, both the buffer portions 121 of the second wall 124 and the buffer portions 121 of the first wall 123 can be used to better absorb the deformation of adjacent battery cells 20 during use, and to better absorb potential tolerances in the length, width, or height directions of adjacent battery cells 20 during assembly, thereby improving the reliability of the discharge pipe 12.

[0099] In some embodiments, the buffer portion 121 of the second wall 124 includes a groove structure 1211 that is close to the battery cell 20 relative to the straight portion 122. Considering that the second wall 124 of the discharge pipe 12 is far from the battery cell 20, providing the buffer portion 121 with a groove structure 1211 ensures that the groove structure 1211 does not occupy the space outside the discharge pipe 12, that is, reduces the additional space occupied by the buffer portion 121 inside the battery device 10, and improves the space utilization of the battery device 10.

[0100] In addition, such as Figures 2 to 5As shown, when the buffer portion 121 of the second wall 124 includes a groove structure 1211, the buffer portion 121 of the corresponding first wall 123 may also include a groove structure 1211. The force directions of the first wall 123 and the second wall 124 are basically the same, which makes the force on the discharge pipe 12 more uniform and can improve the stability and reliability of the discharge pipe 12.

[0101] In some embodiments, such as Figures 2 to 5 As shown, the shape of the buffer portion 121 of the second wall 124 is the same as that of the buffer portion 121 of the first wall 123, so that the buffer portion 121 of the second wall 124 and the buffer portion 121 of the first wall 123 maintain synergy. This facilitates processing and helps to absorb expansion force and tolerance during the process. Different areas of the discharge pipe 12 are subjected to more uniform stress, reducing stress concentration and thus improving the structural strength and stability of the discharge pipe 12.

[0102] It should be understood that the buffer portion 121 of the first wall 123 and / or the buffer portion 121 of the second wall 124 in the embodiments of this application may also have other configurations.

[0103] In some embodiments, when the first wall 123 includes a buffer portion 121, the second wall 124 may or may not include the buffer portion 121. For example, the second wall 124 may include the buffer portion 121, but it differs from... Figure 5 In the embodiment shown, the buffer portion 121 of the second wall 124 may also include a protruding structure 1212 that is away from the battery cell 20 relative to the flat portion 122, so as to increase the internal space of the discharge pipe 12, thereby accelerating the discharge speed of the discharge and improving the reliability of the battery device 10.

[0104] In some embodiments, if the first wall 123 includes a buffer portion 121, the second wall 124 may not have a buffer portion 121. For example, Figure 6 Another cross-sectional schematic diagram of a partial structure of the battery device 10 according to an embodiment of this application is shown, for example, Figure 6 The orientation of the cross-sectional view shown is... Figure 5 Consistent, Figure 6 For different Figure 5 Another embodiment of the battery device 10 shown. Specifically, compared to... Figure 6 and Figure 5 , Figure 6 This illustrates another possible implementation of the discharge pipe 12 according to an embodiment of this application.

[0105] In some embodiments, such as Figure 6As shown, the second wall 124 may also be without the buffer section 121, that is, the second wall 124 may only be provided with the straight section 122, so that the surface of the second wall 124 of the discharge pipe 12 is relatively flat, which is convenient for the installation of other components in the battery device 10, and can also keep the internal space of the discharge pipe 12 larger, thereby increasing the discharge speed of the discharge.

[0106] In some embodiments, when the second wall 124 is provided with a buffer portion 121, the first wall 123 may not include the buffer portion 121, that is, the first wall 123 is only provided with a straight portion 122, which facilitates the provision of a pressure relief hole 1221 in the first wall 123 and reduces the impact of the buffer portion 121 on the pressure relief hole 1221.

[0107] Figure 7 This paper shows another cross-sectional schematic diagram of a partial structure of the battery device 10 according to an embodiment of the present application, for example, Figure 7 The orientation of the cross-sectional view shown is... Figure 5 Consistent, Figure 7 For different Figure 5 and Figure 6 Another embodiment of the battery device 10 shown. Specifically, compared to... Figure 7 and Figure 5-6 , Figure 7 This illustrates another possible implementation of the discharge pipe 12 according to an embodiment of this application.

[0108] In some embodiments, such as Figure 7 As shown, if the first wall 123 does not include the buffer portion 121, the buffer portion 121 provided on the second wall 124 may include a protruding structure 1212 that is further away from the battery cell 20 than the flat portion 122, in order to increase the internal space of the discharge pipe 12, thereby accelerating the discharge speed of the discharge and improving the reliability of the battery device 10.

[0109] Or, different from Figure 7 In the absence of a buffer section 121 in the first wall 123, the buffer section 121 provided in the second wall 124 may include a groove structure 1211 that is closer to the battery cell 20 than the straight section 122, so that the groove structure 1211 will not occupy the space outside the discharge pipe 12, that is, reduce the space occupied by the buffer section 121 in the housing 11 and improve the space utilization of the battery device 10.

[0110] It should be understood that the specific shape and size of the buffer portion 121 in the embodiments of this application can be set according to actual applications. For example, the following description takes the buffer portion 121 including the groove structure 1211 as an example, but the relevant description can also be applied to the protruding structure 1212, and will not be repeated here.

[0111] Figures 8 to 10Several possible implementations of the buffer section 121 in this application embodiment are shown respectively, wherein... Figures 8 to 10 The longitudinal sections of partial structures of the discharge pipe 12 are shown, for example, the... Figures 8 to 10 It can be a partial schematic diagram of the longitudinal section of the first wall 123, or it can be a partial schematic diagram of the longitudinal section of the second wall 124.

[0112] And, as Figures 8 to 10 As shown, in this embodiment of the application, the longitudinal section is perpendicular to the width direction of the discharge pipe 12. Taking the width direction of the discharge pipe 12 as the width direction Y of the battery device 10 as an example, the longitudinal section of the discharge pipe 12 is perpendicular to the width direction Y of the battery device 10.

[0113] In some embodiments, such as Figure 8 As shown, the longitudinal section of the buffer section 121 is arc-shaped, so that the bottom surface of the buffer section 121 is arc-shaped, which reduces stress concentration and improves the structural stability and reliability of the discharge pipeline 12.

[0114] In some embodiments, the longitudinal section of the buffer portion 121 may include one or more arc segments. For example, as... Figure 8 As shown, the longitudinal section of each buffer portion 121 may include a circular arc. For example, as... Figure 9 As shown, the longitudinal section of each buffer portion 121 may include multiple arc segments; and the buffer portion 121 may include multiple arc-shaped groove structures 1211 and at least one protruding structure 1212, which is located in the intersection area between two adjacent arc segments. For example, the longitudinal section of each buffer portion 121 may also include multiple arc segments to form a wavy buffer portion 121.

[0115] In some embodiments, such as Figure 10 As shown, the longitudinal section of the buffer section 121 is a polygonal shape to facilitate processing.

[0116] In some embodiments, the longitudinal section of the buffer portion 121 may include multiple broken lines. For example, the longitudinal section of each buffer portion 121 may include two broken lines, such that the buffer portion 121 is a groove structure 1211 or a protrusion structure 1212. As another example... Figure 10 As shown, the longitudinal section of each buffer portion 121 may include at least three broken lines, so that the buffer portion 121 may include both a groove structure 1211 and a protrusion structure 1212.

[0117] In some embodiments, the longitudinal section of the buffer portion 121 of this application may also include other shapes. For example, the longitudinal section of the buffer portion 121 may also include at least one broken line and at least one arc to improve the design flexibility of the buffer portion 121 to suit different application scenarios.

[0118] It should be understood that the size of the buffer section 121 in this application embodiment can be set according to actual application.

[0119] In some embodiments, the size of the buffer portion 121 can be set according to its location. For example, taking the buffer portion 121 provided on the first wall 123 as an example, considering that the first wall 123 faces the battery cell 20 and the first wall 123 is provided with a pressure relief hole 1221, the size of the buffer portion 121 provided on the first wall 123 is related to its location. The following examples illustrate this. Figures 8 to 10 The description will take the buffer section 121 set in the first wall 123 as an example.

[0120] In some embodiments, such as Figures 8 to 10 As shown, the buffer section 121 includes a groove structure 1211 close to the battery cell 20 relative to the straight section 122; along the axial direction of the discharge pipe 12, the maximum length L of the buffer section 121 ranges from [2mm, 200mm]. Setting the maximum length L of the buffer section 121 to be greater than or equal to 2mm can improve the effect of the buffer section 121 in absorbing expansion force and tolerance, thereby improving the structural strength and stability of the discharge pipe 12. However, since the size of the battery cell 20 is limited and the distance between multiple battery cells 20 is limited, the maximum length L of the buffer section 121 is usually set to be less than or equal to 200mm to reduce the space occupied by the buffer section 121 and facilitate the setting of the pressure relief hole 1221 in the straight section 122.

[0121] It should be understood that the maximum length L of the buffer section 121 in this embodiment can also be in the range of [5mm, 75mm]. This can improve the effect of the buffer section 121 in absorbing expansion force and tolerance, and also ensure that the buffer section 121 does not occupy too much area of ​​the discharge pipe 12, making it easier to set up the pressure relief hole 1221.

[0122] In some embodiments, the maximum length L of the buffer portion 121 may be any of the following values, or between any two of the following values: 2mm, 5mm, 8mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 120mm, 140mm, 150mm, 160mm, 180mm, or 200mm.

[0123] In some embodiments, such as Figures 8 to 10 As shown, the buffer section 121 includes a groove structure 1211 that is close to the battery cell 20 relative to the straight section 122; the maximum depth H of the groove structure 1211 ranges from 1 mm to 40 mm. Setting the maximum depth H of the groove structure 1211 to be greater than or equal to 1 mm can improve the effect of the buffer section 121 in absorbing expansion force and tolerance, especially beneficial for absorbing tolerance and pressure in the direction perpendicular to the first wall 123, and also beneficial for storing more electrolyte and dust in the emissions, thereby improving the structural strength and reliability of the emission pipe 12. However, the space between the emission pipe 12 and the battery cell 20 is limited, so the maximum depth H of the groove structure 1211 is usually set to be less than or equal to 40 mm to reduce the impact of the groove structure 1211 on the battery cell 20, reduce the risk of interference between the groove structure 1211 and the battery cell 20, and thus improve the structural stability and reliability of the battery device 10.

[0124] In some embodiments, the maximum depth H of the groove structure 1211 in this application can be in the range of [2mm, 20mm], which can improve the effect of the buffer part 121 in absorbing expansion force and tolerance, and reduce the risk of interference between the groove structure 1211 and the battery cell 20.

[0125] In some embodiments, the maximum depth H of the groove structure 1211 can be any of the following values, or between any two of the following values: 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 14mm, 15mm, 16mm, 18mm, 20mm, 23mm, 25mm, 28mm, 30mm, 33mm, 35mm, 38mm, or 40mm.

[0126] It should be understood that, such as Figures 8 to 10 As shown, if the buffer portion 121 includes a plurality of groove structures 1211, the maximum depth H of the groove structure 1211 in this embodiment refers to the maximum depth H of the groove structure 1211 with the largest depth among the plurality of groove structures 1211.

[0127] It should be understood that the emission pipe 12 and the battery cell 20 in this embodiment of the application can be relatively fixed in various ways. This will be described below with reference to the accompanying drawings.

[0128] Figure 11 A side view schematic diagram of a partial structure of the battery device 10 according to an embodiment of this application is shown, for example, Figure 11 It can be Figures 1 to 3 A side view of a partial structure of the battery device 10 shown;

[0129] Figure 12 A cross-sectional schematic diagram of a partial structure of the battery device 10 according to an embodiment of this application is shown, for example, Figure 12 It can be along Figure 11 A partially enlarged view of the cross-sectional view along the B-B' direction shown.

[0130] In the embodiments of this application, such as Figures 11 to 12 As shown, the battery cell 20 is also provided with a first limiting part 215, which surrounds the pressure relief mechanism 213 and is disposed on the outer surface of the battery cell 20; the battery device 10 also includes: a plurality of second limiting parts 14, which correspond one-to-one with a plurality of pressure relief holes 1221, and each second limiting part 14 is disposed around the corresponding pressure relief hole 1221. The first limiting part 215 and the second limiting part 14 cooperate with each other so that the emissions discharged from the pressure relief mechanism 213 enter the discharge pipe 12 through the pressure relief hole 1221.

[0131] The battery cell 20 in this embodiment of the application is further provided with a first limiting portion 215, which surrounds the pressure relief mechanism 213, that is, the first limiting portion 215 is located in at least a portion of the area surrounding the pressure relief mechanism 213. For example, as Figures 11 to 12 As shown, the first limiting part 215 can surround the pressure relief mechanism 213; or, unlike... Figures 11 to 12 As shown, the first limiting part 215 can occupy only a local area around the pressure relief mechanism 213 to simplify the structure.

[0132] like Figures 11 to 12 As shown, the first limiting part 215 is disposed on the outer surface of the wall of the battery cell 20 where the pressure relief mechanism 213 is provided. For example, in this embodiment of the application, taking the pressure relief mechanism 213 located on the cover plate 212 of the outer casing 21 of the battery cell 20 as an example, the first limiting part 215 is also located on the cover plate 212 and disposed on the outer surface of the cover plate 212. The outer surface of the cover plate 212 is the side surface of the cover plate 212 away from the interior of the battery cell 20, and the first limiting part 215 protrudes from the outer surface of the cover plate 212 and extends in a direction away from the outer surface.

[0133] In this embodiment of the application, the discharge pipe 12 is disposed on the side of the cover plate 212 where the pressure relief mechanism 213 is located, away from the interior of the battery cell 20. The discharge pipe 12 has a hollow structure for collecting and discharging emissions from the battery cell 20. Figures 11 to 12 As shown, the discharge pipe 12 includes a pressure relief hole 1221, and the plurality of pressure relief holes 1221 correspond one-to-one with the pressure relief mechanism of the plurality of battery cells 20. The pressure relief hole 1221 may be located on the side of the discharge pipe 12 facing the cover plate 212, so that the pressure relief hole 1221 faces the pressure relief mechanism 213.

[0134] In the embodiments of this application, each of the plurality of second limiting portions 14 is disposed around the corresponding pressure relief hole 1221, that is, the second limiting portion 14 is connected to the discharge pipe 12, and the second limiting portion 14 is located in at least a portion of the area surrounding the pressure relief hole 1221. For example, the second limiting portion 14 may surround the pressure relief hole 1221; or, the second limiting portion 14 may occupy only a partial area around the pressure relief hole 1221 to simplify the structure.

[0135] In this embodiment, the second limiting part 14 can protrude relative to the discharge pipe 12 toward the pressure relief mechanism 213 of the battery cell 20, while the first limiting part 215 protrudes toward the discharge pipe 12. The first limiting part 215 and the second limiting part 14 can cooperate to fix the discharge pipe 12 connected to the second limiting part 14 and the battery cell 20 with the first limiting part 215, and to ensure that the pressure relief hole 1221 corresponds to the pressure relief mechanism 213. Thus, in the event of thermal runaway of the battery cell 20, the pressure relief mechanism 213 is activated, and the battery cell 20 discharges emissions through the pressure relief mechanism 213. These emissions pass through the cooperating first limiting part 215 and second limiting part 14 and enter the discharge pipe 12 through the pressure relief hole 1221, whereby the emissions can be collected and discharged by the discharge pipe 12, thereby reducing the impact of the high-temperature, high-pressure emissions on other components inside the casing 11 of the battery device 10. For example, considering that the high-temperature and high-pressure emissions may include conductive particles, which may cause short circuits between multiple components inside the housing 11, leading to further fires or explosions, collecting and discharging these emissions through the discharge pipe 12 can reduce further impact on the battery device 10, lower the risk of explosion, and improve the reliability and stability of the battery device 10.

[0136] In addition, the relative position between the pressure relief hole 1221 of the discharge pipe 12 and the pressure relief mechanism 213 of the battery cell 20 in this embodiment can be fixed by the mutual cooperation of the first limiting part 215 and the second limiting part 14. This design of at least two components cooperating with each other has a certain offset during installation. These offsets can be used to absorb the tolerances between multiple battery cells 20 in the length, width or height directions, thereby improving the assembly efficiency of the battery device 10.

[0137] In this embodiment, the battery device 10 includes a plurality of battery cells 20, and the discharge pipe 12 includes a plurality of pressure relief holes 1221. A plurality of second limiting portions 14 are used to ensure that the plurality of pressure relief holes 1221 correspond to the pressure relief mechanisms 213 of the plurality of battery cells 20. Figures 11 to 12As shown, the battery device 10 of this application embodiment may include a plurality of battery cells 20. For example, the battery device 10 may include a plurality of battery cells 20 arranged along the length direction X of the battery device 10. Correspondingly, the discharge pipe 12 may include a plurality of pressure relief holes 1221 arranged along the length direction X of the battery device 10. The plurality of pressure relief holes 1221 correspond to a plurality of second limiting parts 14. The plurality of pressure relief holes 1221 correspond one-to-one with the pressure relief mechanism 213 of the plurality of battery cells 20, and the plurality of second limiting parts 14 correspond one-to-one with the first limiting parts 215 of the plurality of battery cells 20. In this way, by setting the same discharge pipe 12 to correspond to the plurality of battery cells 20, when any of the plurality of battery cells 20 experiences thermal runaway, the emissions of the battery cells 20 can be collected through the discharge pipe 12, simplifying the structure and reducing the structural complexity of the battery device 10.

[0138] In some embodiments, the battery device 10 may include a plurality of battery cell assemblies. For example, the battery device 10 may include a plurality of battery cell assemblies arranged along the width direction Y of the battery device 10. Each battery cell assembly includes a plurality of battery cells 20. For example, each battery cell assembly may include a plurality of battery cells 20 arranged along the length direction X of the battery device 10. The battery device 10 may include a plurality of discharge pipes 12, which correspond one-to-one with the plurality of battery cell assemblies, for collecting emissions from the battery cells 20 included in the corresponding battery cell assembly.

[0139] In some embodiments, the housing 11 is provided with a discharge port 113, which is used to discharge the emissions from the discharge pipe 12 to the outside of the battery device 10, thereby reducing the impact of high-temperature and high-pressure emissions on other components inside the housing 11 of the battery device 10, reducing the risk of short circuits or even explosions, and improving the reliability and stability of the battery device 10; and, by reasonably setting the position of the discharge port 113, high-temperature and high-pressure emissions can be discharged in a directional manner to suit different application scenarios.

[0140] It should be understood that the housing 11 in this embodiment of the application may be provided with one or more discharge ports 113, and the position of each discharge port 113 may be set according to the actual application. For example, the discharge port 113 may be located in the first housing part 111 and / or the second housing part 112. For example, the housing 11 may be provided with one discharge port 113, and multiple discharge pipes 12 in the battery device 10 may converge to the discharge port 113; or, for example, the housing 11 may be provided with multiple discharge ports 113 for connecting different discharge pipes 12, thereby improving the design flexibility of the battery device 10.

[0141] The following description, in conjunction with the accompanying drawings, will focus on the discharge pipe 12 corresponding to any single battery cell 20 within the battery device 10 of this application embodiment.

[0142] In this embodiment, the relative positions of the first limiting part 215 and the second limiting part 14 can be set according to the actual application.

[0143] In some embodiments, the second limiting portion 14 is sleeved on the outside of the first limiting portion 215, away from the pressure relief mechanism 213. For example... Figures 11 to 12 As shown, the second limiting part 14 is sleeved on the outside of the first limiting part 215, that is, along the radial direction of the pressure relief hole 1221, the second limiting part 14 is located on the outside, and the first limiting part 215 is located on the inside. Considering that when the battery cell 20 experiences thermal runaway, the emissions discharged from the lower battery cell 20 are discharged upward after passing through the pressure relief mechanism 213 and enter the discharge pipe 12 through the pressure relief hole 1221, compared to the scheme of sleeved first limiting part 215 on the second limiting part 14, the case where the second limiting part 14 is sleeved on the outside of the first limiting part 215 can reduce the emissions overflowing through the gap between the first limiting part 215 and the second limiting part 14, thus reducing the impact of these emissions on other battery cells 20 and other components in the battery device 10, reducing the risk of short circuits or even explosions in the battery device 10, and improving the reliability and stability of the battery device 10.

[0144] It should be understood that the first limiting part 215 and the second limiting part 14 in the embodiments of this application can be implemented in a variety of ways.

[0145] In some embodiments, the first limiting portion 215 has a protrusion 2151, and the second limiting portion 14 has a groove 141, wherein the protrusion 2151 of the first limiting portion 215 is at least partially received in the groove 141 of the second limiting portion 14. Figures 11 to 12 As shown, taking the second limiting part 14 sleeved on the outside of the first limiting part 215 away from the pressure relief mechanism 213 as an example, the outer circumference of the first limiting part 215 has a protrusion 2151 protruding towards the second limiting part 14, and the inner circumference of the second limiting part 14 has a groove 141 recessed away from the first limiting part 215. When the protrusion 2151 of the first limiting part 215 is at least partially accommodated in the groove 141 of the second limiting part 14, the first limiting part 215 and the second limiting part 14 can restrict each other, thereby achieving fixation. The structure is simple and easy to implement.

[0146] Or, with Figures 11 to 12 The two limiting parts are set differently. The first limiting part 215 has a groove structure, and the second limiting part 14 has a protrusion structure. The protrusion structure of the second limiting part 14 is at least partially accommodated in the groove structure of the first limiting part 215. In this way, the first limiting part 215 and the second limiting part 14 can restrict each other and thus achieve fixation. The structure is simple and easy to implement.

[0147] Furthermore, for the two configuration methods mentioned above, the relative position between the pressure relief hole 1221 of the discharge pipe 12 and the pressure relief mechanism 213 of the battery cell 20 can be achieved by setting a protruding structure that is at least partially accommodated in the groove structure. Moreover, this structural design has a certain offset during installation, which can be used to absorb the tolerances between multiple battery cells 20 in the length, width or height directions, thereby improving the assembly efficiency of the battery device 10.

[0148] In some embodiments, a sealing structure 15 is provided between the first limiting part 215 and the second limiting part 14. The position of the sealing structure 15 can be set according to the actual application to suit different application scenarios and improve the flexibility of the setting of the sealing structure 15; in addition, the sealing structure 15 can also increase the sealing performance between the discharge pipe 12 and the pressure relief mechanism 213.

[0149] In some embodiments, a sealing structure 15 is provided between the protruding structure and the groove structure to improve the sealing between the discharge pipe 12 and the pressure relief mechanism 213, reduce the impact of overflowing high-temperature and high-pressure emissions on other battery cells 20 and other components in the battery device 10, reduce the risk of short circuits or even explosions in the battery device 10, and improve the reliability and stability of the battery device 10.

[0150] For example, such as Figures 11 to 12 As shown, the sealing structure 15 can be a sealing ring, which can be accommodated in the groove 141 of the second limiting part 14; or, if the first limiting part 215 is provided with a groove structure, the sealing ring can also be accommodated in the groove structure of the first limiting part 215.

[0151] It should be understood that the machining and fixing between the first limiting part 215 and the cover plate 212 in this application embodiment can be achieved in a variety of ways.

[0152] In some embodiments, such as Figures 11 to 12 As shown, the first limiting part 215 and the cover plate 212 on which it is located are integrally formed. For example, the first limiting part 215 can be a component of the cover plate 212 that protrudes toward the discharge pipe 12, so as to simplify the structure of the cover plate 212 and improve the processing efficiency of the battery cell 20.

[0153] Alternatively, the first limiting part 215 and the cover plate 212 it is located on can be separately configured and connected, that is, the two can also be separate structures to increase structural flexibility. For example, the first limiting part 215 and the cover plate 212 can be connected by welding, that is, the first limiting part 215 can be fixed around the pressure relief mechanism 213 by welding, or the first limiting part 215 can also be glued to the cover plate 212 by adhesive, or the first limiting part 215 can also be connected to the cover plate 212 by snap-fit. The embodiments of this application are not limited to these.

[0154] It should be understood that the second limiting part 14 in the embodiments of this application can be implemented in a variety of ways.

[0155] In some embodiments, such as Figures 11 to 12 As shown, the second limiting part 14 and the discharge pipe 12 are integrally formed. For example, the second limiting part 14 can be the part of the discharge pipe 12 that protrudes toward the pressure relief mechanism 213, so as to simplify the structural complexity of the discharge pipe 12 and save the installation steps between the two.

[0156] Alternatively, the second limiting part 14 and the discharge pipe 12 can also be a separate structure. Figure 13 This paper shows a partially exploded structural diagram of the discharge pipe 12 and the second limiting part 14 according to an embodiment of this application. For example, the... Figure 13 The emission pipe 12 shown may be a part of the emission pipe 12 in the embodiments of this application, and may be different from the emission pipe 12. Figure 12 Another possible implementation. Figure 14 A cross-sectional schematic diagram of a partial structure of the battery device 10 according to an embodiment of this application is shown, for example, Figure 14 The cross-section is perpendicular to the width direction Y of the battery device 10, wherein the width direction Y of the battery device 10 in this embodiment is also the width direction of the discharge pipe 12. Figure 15 A schematic diagram of the structure of the second limiting part 14 according to an embodiment of this application is shown. For example, Figure 15 It can be Figure 13 and Figure 14 A schematic diagram of the structure of the second limiting part 14 shown.

[0157] like Figures 13 to 15As shown, the first limiting portion 215 has a groove 2152, for example, the first limiting portion 215 has a groove 2152 recessed away from the second limiting portion 14 along its circumference; the second limiting portion 14 has a protrusion 142, for example, the second limiting portion 14 has a protrusion 142 protruding towards the first limiting portion 215 along its circumference; the protrusion 142 of the second limiting portion 14 is at least partially accommodated in the groove 2152 of the first limiting portion 215, thereby realizing mutual restriction and fixation between the first limiting portion 215 and the second limiting portion 14, with a simple structure and easy implementation. The groove 2152 of the first limiting portion 215 can be formed between the protrusion of the first limiting portion 215 and the cover plate 212 where it is located, but the embodiments of this application are not limited to this.

[0158] In this embodiment, the second limiting part 14 is separately provided and connected to the discharge pipe 12 to improve structural flexibility and facilitate processing. For example, the second limiting part 14 and the discharge pipe 12 are connected by welding, or the second limiting part 14 can be glued to the discharge pipe 12 with adhesive, or the second limiting part 14 can be fixedly connected to the discharge pipe 12 with bolts, screws or other connecting parts. This embodiment is not limited to these methods.

[0159] In some embodiments, at least a portion of the second limiting portion 14 is accommodated within the pressure relief hole 1221. This allows the pressure relief hole 1221 and the pressure relief mechanism 213 to be positioned relative to each other when the first limiting portion 215 and the second limiting portion 14 cooperate. This enables the emissions discharged from the pressure relief mechanism 213 to pass through the cooperating first limiting portion 215 and second limiting portion 14 and enter the discharge pipe 12 through the pressure relief hole 1221. The emissions can then be collected and discharged by the discharge pipe 12, reducing the impact of the high-temperature, high-pressure emissions on other components inside the casing 11 of the battery device 10. For example, when at least a portion of the second limiting portion 14 is accommodated within the pressure relief hole 1221, the portion of the second limiting portion 14 accommodated within the pressure relief hole 1221 can be fixed to the pressure relief hole 1221 using an adhesive.

[0160] It should be understood that the specific structure of the second limiting part 14, which is separately provided from the discharge pipeline 12 in this application embodiment, can be set according to actual application.

[0161] In some embodiments, the second limiting portion 14 includes a guide tube 144 and a limiting structure 143. One end of the guide tube 144 is accommodated in the pressure relief hole 1221, and the other end of the guide tube 144 extends toward the pressure relief mechanism 213. The limiting structure 143 surrounds the guide tube 144 and is used to cooperate with the first limiting portion 215. Thus, when the first limiting portion 215 and the second limiting portion 14 cooperate, that is, when the first limiting portion 215 and the limiting structure 143 cooperate, the emissions discharged from the pressure relief mechanism 213 can enter the discharge pipe 12 through the guide tube 144, and then the emissions can be collected and discharged by the discharge pipe 12 to reduce the impact of the high-temperature and high-pressure emissions on other components inside the casing 11 of the battery device 10.

[0162] In this embodiment, the limiting structure 143 surrounds the guide tube 144, meaning the limiting structure 143 is located in at least a portion of the area surrounding the guide tube 144. For example, as Figures 13 to 15 As shown, the limiting structure 143 may occupy only a local area around the guide tube 144; for example, two limiting structures 143 may be arranged opposite each other around the guide tube 144. Alternatively, unlike... Figures 13 to 15 As shown, the limiting structure 143 can surround the flow guide tube 144.

[0163] In some embodiments, the first limiting part 215 is located between the guide pipe 144 and the limiting structure 143, that is, the first limiting part 215 is clamped between the limiting structure 143 and the guide pipe 144, so that the limiting structure 143 and the first limiting part 215 can cooperate with each other to improve structural stability and sealing, so that the discharge discharged by the self-decompression mechanism 213 enters the discharge pipe 12 through the guide pipe 144, reducing the overflow of discharge.

[0164] It should be understood that the mutual cooperation between the first limiting part 215 and the second limiting part 14 in the embodiments of this application can be achieved through the mutual cooperation of the limiting structure 143 of the first limiting part 215 and the second limiting part 14. For example, if the first limiting part 215 has a protrusion 2151 and the second limiting part 14 has a groove 141, then the groove 141 of the second limiting part 14 is disposed in the limiting structure 143; as another example, if the first limiting part 215 has a groove 2152 and the second limiting part 14 has a protrusion 142, then the protrusion 142 of the second limiting part 14 is disposed in the limiting structure 143.

[0165] In some embodiments, such as Figures 13 to 15As shown, a sealing structure 15 is provided between the end of the first limiting part 215 away from the cover plate 212 and the second limiting part 14. For example, the sealing structure 15 can be located between the guide pipe 144 and the limiting structure 143, and at the end of the first limiting part 215 away from the cover plate 212, to improve the sealing between the first limiting part 215 and the second limiting part 14, reduce the high-temperature and high-pressure emissions overflowing from between the first limiting part 215 and the second limiting part 14, thereby reducing the impact of the overflowing emissions on other components inside the casing 11 of the battery device 10, and improving the reliability and stability of the battery device 10.

[0166] It should be understood that the discharge pipe 12 in this embodiment can be used to discharge the emissions from the battery cell 20. Furthermore, the discharge pipe 12 is also used to inject a fire-fighting medium into the battery cell 20 through the pressure relief port 1221. In the event of thermal runaway of the battery cell 20, the fire-fighting medium can be injected into the battery cell 20 through the pressure relief port 1221 of the discharge pipe 12. This fire-fighting medium can reduce the temperature of the battery cell 20 experiencing thermal runaway, reduce the risk of fire and thermal diffusion, thereby reducing the risk of explosion and improving the reliability of the battery device 10.

[0167] In some embodiments, the fire-fighting medium in this application may also be a cooling medium, a coolant, or a cooling gas. For example, the fire-fighting medium may be water, a mixture of water and ethylene glycol, or air.

[0168] It should be understood that the discharge of emissions from the battery cell 20 through the discharge pipe 12, and the injection of fire-fighting media into the battery cell 20 through the same discharge pipe 12, can be achieved in various ways. For example, the discharge pipe 12 has two ports arranged along its axial direction, one port for discharging emissions from the battery cell 20 and the other port for injecting fire-fighting media into the battery cell 20.

[0169] For example, the discharge pipe 12 may be equipped with a detector for detecting the smoke concentration in the discharge pipe 12. When the detector detects that the smoke concentration in the discharge pipe 12 exceeds a preset value, fire-fighting medium is injected through one port of the discharge pipe 12. In the event of thermal runaway of the battery cell 20, the emissions discharged through the pressure relief mechanism 213 enter the discharge pipe 12 and are discharged through one port of the discharge pipe 12. Furthermore, the emissions will cause the smoke concentration in the discharge pipe 12 to increase. Therefore, the detector can detect that the smoke concentration in the discharge pipe 12 exceeds the preset value after the battery cell 20 experiences thermal runaway. Fire-fighting medium can then be injected into the discharge pipe 12 through another port to reduce the temperature of the thermally runaway battery cell 20, reduce the risk of fire in the thermally runaway battery cell 20, and also reduce the risk of further thermal diffusion between the thermally runaway battery cell 20 and adjacent battery cells 20.

[0170] As an example, a fire extinguishing agent bottle can be installed in the energy storage device, and the discharge pipe 12 is connected to the fire extinguishing agent bottle to inject the fire extinguishing medium into the battery cell 20.

[0171] Figure 16 The diagram shows the structure of a battery cell 20 according to an embodiment of this application. For example, the battery cell 20 can be any one of the battery cells 20 in the battery device 10 according to an embodiment of this application. Figure 17 An exploded view of a partial structure of the battery cell 20 according to an embodiment of this application is shown, for example, Figure 17 It can be Figure 16 The diagram shows an exploded view of the casing 21 of the battery cell 20.

[0172] In this embodiment of the application, the battery cell 20 is provided with a first limiting part 215, which is arranged around the pressure relief mechanism 213. The pressure relief mechanism 213 can be located on any wall of the battery cell 20, and correspondingly, the first limiting part 215 can also be located on any wall of the battery cell 20.

[0173] For example, along the direction of gravity, the pressure relief mechanism 213 is located on the top wall or side wall of the battery cell 20. Correspondingly, along the direction of gravity, the first limiting part 215 can also be located on the top wall or side wall of the battery cell 20. That is, in the actual application of the battery cell 20, the top wall of the battery cell 20 facing upward or the side wall intersecting with the top wall can be a wall provided with the pressure relief mechanism 213, so as to facilitate the installation of the discharge pipe 12.

[0174] In some embodiments, such as Figure 16 and Figure 17As shown, the battery cell 20 includes a housing 21. Specifically, the housing 21 may include a shell 211, which is a hollow structure having at least one opening 2111. Further, the housing 21 also includes a cover plate 212 for covering the opening 2111 of the shell 211, so that the electrode assembly can be accommodated within the housing 21.

[0175] It should be understood that the housing 211 in this embodiment is a component for accommodating the electrode assembly. The housing 211 can be a hollow structure with an opening at one or more ends. For example, if the housing 211 is a hollow structure with an opening at one end, a cover plate 212 can be provided accordingly; if the housing 211 is a hollow structure with openings at opposite ends, two cover plates 212 can be provided, with the two cover plates 212 respectively covering the openings at both ends of the housing 211.

[0176] It should be understood that the cover plate 212 in this embodiment is used to cover the opening 2111 of the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the cover plate 212 can be adapted to the shape of the housing 211. For example, as Figure 16 and Figure 17 As shown, the shell 211 has a cuboid structure, and the cover plate 212 has a rectangular plate structure that is adapted to the shell 211.

[0177] In some embodiments, the first limiting portion 215 may be located on any wall of the housing 21. For example, as Figure 16 and Figure 17 As shown, the first limiting part 215 can be located on the cover plate, that is, the cover plate 212 is provided with the first limiting part 215 and the pressure relief mechanism 213 to facilitate processing, but the embodiments of this application are not limited thereto.

[0178] In some embodiments, the outer casing 21 can be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the outer casing 21 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 21 is a non-sealed structure, the outer casing 21 serves to protect its internal electrode assembly, and a sealing bag is also included between the outer casing 21 and the electrode assembly. The sealing bag is used to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing 21 is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0179] In some embodiments, the wall with the pressure relief mechanism 213 is further provided with two electrode terminals 214, and the pressure relief mechanism 213 is located between the two electrode terminals 214 to improve the integration of the battery cell 20 and facilitate processing. Specifically, the battery cell 20 of this application embodiment may include multiple electrode terminals 214, each electrode terminal 214 may be disposed on any wall, and the multiple electrode terminals 214 may be disposed on the same wall or different walls of the battery cell 20. For example, as Figure 16 and Figure 17 As shown, each battery cell 20 includes two electrode terminals 214, which are located on the same wall. For example, both electrode terminals 214 can be located on the cover plate 212.

[0180] In the event of thermal runaway in the battery cell 20, the pressure relief mechanism 213 is activated, and the battery cell 20 discharges emissions through the pressure relief mechanism 213. These emissions pass through the cooperating first limiting part 215 and second limiting part 14 and enter the discharge pipe 12 through the pressure relief hole 1221. The emissions can then be collected and discharged through the discharge pipe 12 to reduce the impact of the high-temperature, high-pressure emissions on the electrode terminals 214 on both sides of the pressure relief mechanism 213. For example, considering that the high-temperature, high-pressure emissions may include conductive particles, these particles may splash onto the electrode terminals 214 of the battery cell 20, causing a short circuit in the battery cell 20, which could lead to further fire or explosion. Therefore, collecting and discharging these emissions through the discharge pipe 12 can reduce further impact on the battery device 10, lower the risk of explosion, and improve the reliability and stability of the battery device 10.

[0181] It should be understood that the electrode terminals 214 in this embodiment are used for electrical connection with the electrode assembly inside the battery cell 20 to output the electrical energy of the battery cell 20. Furthermore, the battery cell 20 may include at least two electrode terminals 214, each including at least one positive electrode terminal 2141 and at least one negative electrode terminal 2142. The positive electrode terminal 2141 is used for electrical connection with the positive electrode tab of the electrode assembly, and the negative electrode terminal 2142 is used for electrical connection with the negative electrode tab of the electrode assembly. The positive electrode terminal 2141 and the positive electrode tab can be directly connected or indirectly connected, and the negative electrode terminal 2142 and the negative electrode tab can be directly connected or indirectly connected. For example, the positive electrode terminal 2141 can be electrically connected to the positive electrode tab through a current collector, and the negative electrode terminal 2142 can be electrically connected to the negative electrode tab through a current collector.

[0182] In some embodiments, the cover plate 212 may also be provided with other components. For example, the cover plate 212 may also be provided with an injection hole to inject electrolyte into the interior of the battery cell 20 through the injection hole, but the embodiments of this application are not limited thereto.

[0183] According to some embodiments of this application, this application also provides an electrical device including the battery device 10 described in any of the above embodiments, and the battery device 10 is used to provide electrical energy to the electrical device.

[0184] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery device 10, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft. The electrical device can be any of the aforementioned devices or systems that use battery devices.

[0185] Figure 18 A schematic diagram of the structure of the storage unit 30 of the energy storage device 1 according to an embodiment of this application is shown; Figure 19 This diagram illustrates the structure of multiple battery devices 10 housed within a housing 30 according to an embodiment of this application. According to some embodiments of this application, an energy storage device 1 is provided, including one or more battery clusters 100 to increase the voltage and capacity of the energy storage device 1. Each battery cluster 100 may include multiple battery devices 10, which are connected in series via a busbar to increase the voltage of the energy storage device 1. When the energy storage device 1 includes multiple battery clusters 100, the multiple battery clusters 100 are connected in parallel to increase the capacity of the energy storage device 1.

[0186] The energy storage device 1 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device 1 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 1 can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours. The energy storage system provided in this application embodiment can be any power system that requires the use of the energy storage device 1.

[0187] In some embodiments, the energy storage device 1 is an energy storage container or an energy storage cabinet.

[0188] In some embodiments, the energy storage device 1 may include a housing 30 for accommodating a plurality of battery devices 10. Exemplarily, the housing 30 of the energy storage device 1 in this application embodiment may include at least one battery compartment 31, each battery compartment 31 may be used to accommodate at least one battery cluster 100, and each battery cluster 100 may include a plurality of battery devices 10. For example, as... Figure 18 and Figure 19 As shown, the housing 30 includes multiple battery compartments 31, each corresponding to a single battery cluster 100; or, unlike... Figure 18 and Figure 19 As shown, the housing 30 may include at least one battery compartment 31, each battery compartment 31 being used to accommodate multiple battery clusters, but the embodiments of this application are not limited thereto.

[0189] In some embodiments, the discharge pipe 12 included in the battery device 10 can be connected to the outside of the housing 30 so that the discharge in the discharge pipe 12 can be discharged to the outside of the housing 30, reducing the leakage of the discharge into the housing 30 and thus affecting other battery devices 10 and other components inside the housing 30, thereby improving the reliability of the energy storage device 1.

[0190] like Figure 18 and Figure 19 As shown, the energy storage device 1 also includes a manifold 40 for connecting the discharge pipe 12 to the outside of the housing 30. Exemplarily, in conjunction with... Figure 1 Each of the multiple battery devices 10 has a discharge pipe 12 that can be connected to the outside of the battery device 10 through a discharge port 113 of the housing 11. Furthermore, a manifold 40 can be connected to the discharge pipe 12 passing through the discharge port 113 to connect the discharge pipes 12 of the multiple battery devices 10 to the manifold 40. At least one end of the manifold 40 can pass through the housing 30, thereby allowing the discharge pipes 12 to be connected to the outside of the housing 30 through the manifold 40.

[0191] In some embodiments, the energy storage device 1 may further include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module. Exemplarily, at least some of the above modules may be housed within the storage enclosure 30.

[0192] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 10 via piping for regulating the temperature of the individual battery cells.

[0193] As an example, the main control module can serve as the battery management unit of the battery cluster 100, used to monitor and manage the battery cluster 100. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster 100. For example, it can control the charging and discharging current and voltage of the battery cluster 100. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0194] As an example, the central control module can serve as the battery management unit for energy storage device 1, used to monitor and manage it. The central control module can monitor information such as current, voltage, power, state of charge, and temperature of energy storage device 1. For example, it can control the charging and discharging current and voltage of energy storage device 1. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0195] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0196] As an example, the power distribution device can be used to distribute power to the power modules of the energy storage device 1.

[0197] According to some embodiments of this application, this application also provides an energy storage system, including the energy storage device 1 described in any of the above embodiments. Figure 20 A structural block diagram of an energy storage system according to an embodiment of this application is shown. In some embodiments, such as... Figure 20 As shown, the energy storage system may include one or more energy storage devices 1 and a power converter system (PCS) 2, wherein the power converter 2 is used to connect between the power generation device 3 and the energy storage device 1. The power generation device 3 is used to generate electrical energy, and the electrical energy generated by the power generation device 3 can be stored in the energy storage device 1 through the power converter 2. As an example, the power generation device 3 may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. The specific type of the power generation device 3 is not limited in this application.

[0198] According to some embodiments of this application, this application provides a charging network. Figure 21 A structural block diagram of a charging network according to an embodiment of this application is shown. Figure 21 As shown, the charging network includes a charging pile 4 and an energy storage device 1. The charging pile 4 is electrically connected to the energy storage device 1, which provides power to the charging pile 4. The charging pile 4 is electrically connected to a battery device in the energy storage device 1 via a cable, allowing the battery device to supply its stored energy to the charging pile 4. The charging pile 4 has one or more connectors 5 for connecting to electrical devices (such as vehicles) to replenish their power.

[0199] The energy storage device 1 can be located inside the charging pile (e.g., an integrated energy storage and charging unit) or outside the charging pile.

[0200] According to some embodiments of this application, see Figures 2 to 10 This application provides a battery device 10, including: a plurality of battery cells 20, each battery cell 20 being provided with a pressure relief mechanism 213; and a discharge pipe 12, the discharge pipe 12 being provided with a plurality of pressure relief holes 1221 corresponding one-to-one with the pressure relief mechanisms 213 of the plurality of battery cells 20, so that the emissions discharged from the pressure relief mechanism 213 enter the discharge pipe 12 through the pressure relief holes 1221 and are discharged through the discharge pipe 12, the discharge pipe 12 including a buffer section 121.

[0201] The discharge pipe 12 also includes a straight section 122, with a pressure relief hole 1221 located in the straight section 122. The buffer section 121 includes a groove structure 1211 that is close to the battery cell 20 relative to the straight section 122 and / or a protrusion structure 1212 that is far away from the battery cell 20 relative to the straight section 122.

[0202] A pressure relief hole 1221 is located on the first wall 123 of the discharge pipe 12, and the first wall 123 is provided with a buffer portion 121. The first wall 123 is provided with a plurality of buffer portions 121, each buffer portion 121 corresponding to the area between two adjacent battery cells 20. The buffer portions 121 of the first wall 123 correspond one-to-one with the areas between each two adjacent battery cells 20 in the plurality of battery cells 20. The buffer portion 121 of the first wall 123 includes a groove structure 1211 close to the battery cell 20 relative to the straight portion 122. The buffer portion 121 includes a groove structure 1211 close to the battery cell 20 relative to the straight portion 122; wherein, along the axial direction of the discharge pipe 12, the maximum length of the buffer portion 121 ranges from [2mm, 200mm], and / or, the maximum depth of the groove structure 1211 ranges from [1mm, 40mm].

[0203] The discharge pipe 12 also includes a second wall 124 disposed opposite to the first wall 123, and the second wall 124 is provided with a buffer portion 121. The buffer portion 121 of the second wall 124 is disposed opposite to the buffer portion 121 of the first wall 123. The buffer portion 121 of the second wall 124 includes a groove structure 1211 that is close to the battery cell 20 relative to the straight portion 122. The shape of the buffer portion 121 of the second wall 124 is the same as the shape of the buffer portion 121 of the first wall 123.

[0204] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Multiple battery cells (20), each battery cell (20) is provided with a pressure relief mechanism (213); The discharge pipeline (12) is provided with a plurality of pressure relief holes (1221) corresponding one-to-one with the pressure relief mechanisms (213) of the plurality of battery cells (20), so that the emissions discharged from the pressure relief mechanism (213) enter the discharge pipeline (12) through the pressure relief holes (1221) and are discharged through the discharge pipeline (12). The discharge pipeline (12) includes a buffer section (121).

2. The battery device according to claim 1, characterized in that, The discharge pipeline (12) also includes a straight section (122), and the pressure relief hole (1221) is located in the straight section (122).

3. The battery device according to claim 2, characterized in that, The buffer portion (121) includes a groove structure (1211) that is close to the battery cell (20) relative to the flat portion (122) and / or a protrusion structure (1212) that is far away from the battery cell (20) relative to the flat portion (122).

4. The battery device according to claim 2, characterized in that, The pressure relief hole (1221) is located on the first wall (123) of the discharge pipeline (12), and the first wall (123) is provided with the buffer part (121).

5. The battery device according to claim 4, characterized in that, The first wall (123) is provided with a plurality of buffer portions (121), each buffer portion (121) corresponding to the area between two adjacent battery cells (20).

6. The battery device according to claim 5, characterized in that, The buffer portion (121) included in the first wall (123) corresponds one-to-one with the area between each two adjacent battery cells (20) in the plurality of battery cells (20).

7. The battery device according to claim 4, characterized in that, The buffer portion (121) of the first wall (123) includes a groove structure (1211) that is close to the battery cell (20) relative to the flat portion (122).

8. The battery device according to claim 4, characterized in that, The discharge pipe (12) also includes a second wall (124) disposed opposite to the first wall (123), and the second wall (124) is provided with the buffer part (121).

9. The battery device according to claim 8, characterized in that, The buffer portion (121) of the second wall (124) is disposed opposite to the buffer portion (121) of the first wall (123).

10. The battery device according to claim 8, characterized in that, The buffer portion (121) of the second wall (124) includes a groove structure (1211) that is close to the battery cell (20) relative to the flat portion (122).

11. The battery device according to claim 8, characterized in that, The shape of the buffer portion (121) of the second wall (124) is the same as the shape of the buffer portion (121) of the first wall (123).

12. The battery device according to any one of claims 4 to 11, characterized in that, The buffer portion (121) includes a groove structure (1211) that is close to the battery cell (20) relative to the flat portion (122); Wherein, along the axial direction of the discharge pipe (12), the maximum length of the buffer section (121) ranges from [2mm, 200mm], and / or, The maximum depth of the groove structure (1211) ranges from 1 mm to 40 mm.

13. The battery device according to any one of claims 1 to 11, characterized in that, The longitudinal section of the buffer section (121) is circular or broken, wherein the longitudinal section of the buffer section (121) is perpendicular to the width direction of the discharge pipe (12).

14. The battery device according to any one of claims 1 to 11, characterized in that, Along the direction of gravity, the pressure relief mechanism (213) is located on the top wall or side wall of the battery cell (20).

15. The battery device according to any one of claims 1 to 11, characterized in that, The battery cell (20) is also provided with a first limiting part (215), which surrounds the pressure relief mechanism (213) and is disposed on the outer surface of the battery cell (20); The battery device also includes: Multiple second limiting parts (14) are provided, each corresponding to a pressure relief hole (1221). Each second limiting part (14) is arranged around the corresponding pressure relief hole (1221). The first limiting part (215) and the second limiting part (14) cooperate with each other so that the discharge from the pressure relief mechanism (213) enters the discharge pipeline (12) through the pressure relief hole (1221).

16. An energy storage device, characterized in that, include: Multiple battery devices according to any one of claims 1 to 15, the battery devices being used to store or provide electrical energy.

17. An energy storage system, characterized in that, include: Power conversion device (2); According to claim 16, the power conversion device (2) is used to electrically connect the power generation device (3) and the energy storage device.

18. A charging network, characterized in that, include: Charging piles (4); The energy storage device according to claim 16 or the energy storage system according to claim 17 is used to provide electrical energy to the charging pile (4).

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