Battery devices and electrical appliances

Abstract

This application provides a battery device and an electrical device, wherein the battery device includes: a battery cell, a heat exchange plate, and a sealing part. The heat exchange plate has a fusible perforation portion penetrating its wall. The sealing part surrounds the fusible perforation portion and connects the first wall of the battery cell to the heat exchange plate. When the battery cell experiences thermal runaway, the battery cell temperature rises, and the high temperature causes the fusible perforation portion to melt rapidly and puncture. Because the fusible perforation portion is no longer an obstruction, the heat exchange fluid comes into direct contact with the battery cell, achieving efficient cooling of the thermally runaway battery cell. Furthermore, since the heat exchange fluid only contacts one side of the battery cell, excessive contact between the heat exchange fluid and the battery cell avoids affecting its insulation, thereby preventing the risk of short circuits caused by the heat exchange fluid.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Technology

[0002] Battery packs are widely used in the new energy field, such as in electric vehicles and new energy vehicles, which have become a new trend in the automotive industry. The development of battery technology must consider multiple design factors simultaneously, such as energy density, cycle life, discharge capacity, and charge / discharge rate. Additionally, the reliability of the battery pack must be considered. However, when a cell experiences thermal runaway, the high temperature can rapidly spread, easily causing thermal damage to adjacent cells and affecting their reliability.

[0003] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery device and an electrical device that can improve the reliability of the battery device.

[0005] To solve the above-mentioned technical problems, or at least partially solve them, this application provides the following technical solutions:

[0006] In a first aspect, embodiments of this application provide a battery device comprising: a battery cell having a first wall; a thermal management assembly including a heat exchange plate located on one side of the first wall and having a heat exchange channel therein, the heat exchange plate having a fusible perforation portion penetrating its wall, the fusible perforation portion being configured to melt when the battery cell experiences thermal runaway; and a sealing portion having a continuous annular structure, the sealing portion surrounding the fusible perforation portion and connecting the first wall and the heat exchange plate; wherein the melting temperature of the fusible perforation portion is T1, the melting temperature of the sealing portion is T2, and T1 < T2.

[0007] In the above technical solution, when a battery cell experiences thermal runaway, the temperature of the battery cell rises, and the high temperature causes the fusible perforation part to melt rapidly and break through. Since the barrier of the fusible perforation part is lost, the heat exchange fluid comes into direct contact with the battery cell. The heat generated by the thermal runaway of the battery cell can be quickly and directly absorbed by the heat exchange fluid, achieving efficient cooling of the thermally runaway battery cell. This reduces the heat diffusion of the thermally runaway battery cell to the surrounding area, suppresses heat spread, and prevents the thermal runaway of a single battery cell from escalating to the thermal runaway of the entire battery device. In addition, since the heat exchange fluid only contacts one side of the battery cell, excessive contact between the heat exchange fluid and the battery cell is avoided, which may affect its insulation and thus avoid the risk of short circuit caused by the heat exchange fluid.

[0008] In some embodiments, the number of battery cells is multiple, and the heat exchange plate includes multiple fusible perforation portions, with each battery cell corresponding to at least one fusible perforation portion.

[0009] The above structure ensures that when any single battery cell experiences thermal runaway, at least one fusible part melts and breaks through, thus efficiently cooling the thermally runaway battery cell.

[0010] In some embodiments, there are multiple battery cells and multiple sealing portions, with each battery cell connected to at least one sealing portion, and the sealing portion surrounding at least one fusible perforation portion.

[0011] The above structure ensures that when any single battery cell experiences thermal runaway, the fusible perforation portion within at least one corresponding sealing part melts and perforates, thereby precisely cooling and dissipating heat from the thermally runaway battery cell.

[0012] In some embodiments, the battery device includes a seal, the seal including a body, the body having a plurality of first through holes to form sealing ribs on the body, the plurality of sealing ribs surrounding to form a sealing portion.

[0013] The sealing part is formed by multiple sealing ribs, which gives the sealing part high mechanical strength and rigidity, thus ensuring the reliability of the sealing part in use.

[0014] In some embodiments, the sealing portion is located between the first wall and the heat exchange plate in the thickness direction of the first wall.

[0015] The sealing part occupies the space between the first wall and the heat exchange plate, without requiring additional external space, which is conducive to the miniaturization and integrated design of the overall structure. In addition, the sealing part is squeezed by the first wall and the heat exchange plate, which makes the sealing part uniformly stressed and reliably pressed, forming a stable sealing surface that is not easy to loosen due to external forces.

[0016] In some embodiments, the width of the sealing portion connecting to the first wall in the thickness direction perpendicular to the first wall is not less than 5 mm.

[0017] In the above technical solution, the limitations of the above parameters ensure that there is sufficient contact area between the battery cell and the sealing part, thereby ensuring the sealing performance of the sealing part and effectively supporting the battery cell.

[0018] In some embodiments, an easily ablation portion is provided between the first wall and the heat exchange plate. The easily ablation portion contacts the battery cell and the heat exchange plate respectively. The easily ablation portion is configured to ablate when the battery cell experiences thermal runaway.

[0019] When the high temperature of the battery cell causes the easily ablated part to rapidly pyrolyze and ablate, the easily fusible part is affected by the pyrolysis of the easily ablated part and melts through rapidly. That is, the easily ablated part plays a heat transfer role, so as to ensure that the easily fusible part melts through rapidly when the battery cell experiences thermal runaway.

[0020] In some embodiments, the first wall, the heat exchange plate, and the sealing portion form a first cavity, the easily ablated portion fills the first cavity, and communicates with the easily fusible portion.

[0021] After the easily ablated parts undergo rapid pyrolysis and ablation, and after the easily ablated parts undergo rapid melting and penetration, the heat exchange fluid enters the first cavity and contacts the battery cells to cool them down. The first cavity ensures that the battery cells and the heat exchange fluid have a large contact area, which greatly increases the effective heat exchange area, resulting in a short heat conduction path, low thermal resistance, and faster heat dissipation.

[0022] In some embodiments, the porosity of the easily ablated portion is 30%-50%.

[0023] In the above technical solution, the porosity parameter exposes a large area of ​​the material inside the easily ablated part, allowing heat to quickly enter the interior of the easily ablated part, thereby enabling the easily ablated part to reach the thermal decomposition temperature more quickly and to more easily undergo rapid pyrolysis and ablation.

[0024] In some embodiments, the melting temperature of the easily ablated portion is T3, where T3 < T2.

[0025] In the above technical solution, the temperature parameter limitation ensures that the sealing part does not melt when the easily ablated part melts, thereby ensuring the reliability of the sealing part.

[0026] In some embodiments, the heat exchange plate is provided with a second through hole penetrating its plate wall, and the second through hole is filled with a sealing element, which forms a fusible perforation portion.

[0027] In the above technical solution, all the sealing components are located inside the second through hole, which is compact and does not occupy external space.

[0028] In some embodiments, the second through hole includes a first end near the first wall and a second end communicating with the heat exchange channel, wherein the diameter of the first end is smaller than the diameter of the second end.

[0029] In the above technical solution, the structure of the second through hole makes the sealing component have a shape that is large at one end and small at the other end, which avoids the sealing component from coming out of the second through hole due to the pressure in the heat exchange channel, thereby ensuring the sealing reliability of the sealing component under normal temperature conditions.

[0030] In some embodiments, the battery device further includes: a thermal runaway detector configured to send an electrical signal when a single battery cell experiences thermal runaway; and a control unit connected to the thermal runaway detector and a thermal management component, respectively, configured to control a reduction in the pressure of the heat exchange fluid in the heat exchange channel based on the electrical signal, the pressure of the heat exchange fluid being greater than the pressure in the area surrounding the sealing portion.

[0031] In the above technical solution, the heat exchange fluid comes into contact with the thermally runaway battery cell and cools it down to produce liquid vapor. When the thermal runaway detector detects that the battery has thermally runaway, it generates an electrical signal. After receiving the electrical signal, the controller controls the pressure of the heat exchange fluid pumped into the heat exchange channel in the thermal management component. The liquid vapor directly enters the heat exchange plate from the channel formed after the fusible perforation part melts through, and is discharged from the outlet of the thermal management component, thus avoiding the impact of liquid vapor on the heat exchange efficiency.

[0032] In some embodiments, the portion of the sealing part that connects to the first wall has a weak area. The connection strength between the sealing part and the first wall at the weak area is less than the connection strength between the sealing part and the first wall at other connection areas. The weak area is configured to form a pressure reduction channel when the pressure in the space enclosed by the sealing part is greater than a preset pressure.

[0033] In the above technical solution, when the easily ablated part is pyrolyzed and generates gas, the gas increases the pressure in the space enclosed by the sealing part. Excessive pressure in the space enclosed by the sealing part will cause a pressure reduction channel to form in the weak area, thereby venting the gas out and reducing the pressure in the space enclosed by the sealing part. This ensures effective contact between the heat exchange fluid and the battery cell, and avoids the impact of gas on the heat exchange efficiency.

[0034] Secondly, embodiments of this application provide an electrical device that includes the aforementioned battery device, which is used to provide electrical energy.

[0035] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0038] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0039] Figure 3 A partial structural schematic diagram of a first embodiment of the battery device provided in some embodiments of this application;

[0040] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure along the AA direction;

[0041] Figure 5 for Figure 4 Enlarged structural diagram of section B in the middle;

[0042] Figure 6 This is an exploded view of a second embodiment of the battery device provided in some embodiments of this application;

[0043] Figure 7 This is a partial cross-sectional view of a second embodiment of the battery device provided in some embodiments of this application;

[0044] Figure 8 for Figure 7 Enlarged structural diagram of section C;

[0045] Figure 9 This is a partial cross-sectional view of a third embodiment of the battery device provided in some embodiments of this application;

[0046] Figure 10 This is a partial cross-sectional view of a fourth embodiment of the battery device provided in some embodiments of this application;

[0047] Figure 11 This is a structural block diagram of the battery device control unit provided in some embodiments of this application.

[0048] The attached figures are labeled as follows:

[0049] 1000, Vehicle; 100, Battery unit; 200, Controller; 300, Motor;

[0050] 10. Box body; 11. Upper box body; 12. Lower box body;

[0051] 20. Battery cell; 21. First wall; 30. First cavity;

[0052] 40. Thermal management components; 41. Heat exchange plate; 42. Heat exchange channel; 43. Second through hole;

[0053] 50. Easily permeable parts; 60. Easily ablated parts; 70. Sealing parts; 71. Weak areas; 81. Thermal runaway detectors; 82. Control components; 90. Thermal insulation pads;

[0054] 101. Sealing element; 102. First through hole; 103. Sealing rib. Detailed Implementation

[0055] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, not intended to limit the scope of protection of this application. Through these descriptions, the features and advantages of this application will become clearer and more explicit.

[0056] 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 this application is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification and the foregoing description of this application are intended to cover non-exclusive inclusion.

[0057] The term "embodiment" as used in this application 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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. 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.

[0058] The specific term "exemplary" used in this application means "serving as an example, embodiment, or illustration." Any embodiment illustrated as "exemplary" is not necessarily to be construed as superior or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0059] In the description of this application, the technical terms "first", "second", "third", etc. are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0060] In the description of this application, the technical 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, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0061] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0062] In the description of this application, unless otherwise expressly specified and limited, the technical terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] In the description of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0064] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), unless otherwise explicitly specified. Similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0065] In the description 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, and other dimensions of various components in the embodiments of this application shown in the drawings, as well as the overall thickness, length, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0066] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0067] In related technologies, the development of battery technology must take into account multiple design factors, such as cycle life, energy density, discharge capacity, charge-discharge rate and other performance parameters. In addition, the reliability of battery use also needs to be considered.

[0068] In related technologies, when a cell in a battery pack experiences thermal runaway, if it is not effectively cooled in time, the large amount of heat rapidly released due to the runaway will spread and transfer rapidly within the cell through heat conduction, heat radiation, and internal gas convection. The continuously rising high temperature will directly affect adjacent cells, causing thermal damage such as overheating of the casing, shrinkage and melting of the internal separator, thermal deformation of the electrode structure, and thermal decomposition and volatilization of the electrolyte. This leads to a decrease in the charge / discharge performance, reduced cycle life, and deterioration of internal consistency in adjacent cells, severely affecting their reliability and structural stability. If the high-temperature spread is not suppressed in time, it can easily induce adjacent cells to trigger thermal runaway successively, forming a chain reaction of thermal propagation.

[0069] Therefore, this application provides a battery device comprising: a battery cell, a heat exchange plate, and a sealing element. The battery cell has a first wall. The heat exchange plate has a fusible perforation portion penetrating its wall, the fusible perforation portion being configured to melt in the event of thermal runaway of the battery cell. The sealing element is a continuous annular structure, surrounding the fusible perforation portion, and connecting the first wall and the heat exchange plate. The melting temperature of the fusible perforation portion is T1, and the melting temperature of the sealing element is T2, wherein T1 < T2.

[0070] This application provides a battery device in which, when a battery cell experiences thermal runaway, the cell temperature rises, causing the fusible link to melt rapidly and break through. Since the fusible link is no longer an obstacle, the heat exchange fluid comes into direct contact with the battery cell. The heat generated by the thermal runaway of the battery cell can be quickly and directly absorbed by the heat exchange fluid, achieving efficient cooling of the thermally runaway battery cell. This reduces the spread of heat from the thermally runaway battery cell to the surrounding area, suppresses heat propagation, and prevents the thermal runaway of a single battery cell from escalating to the thermal runaway of the entire battery device. Furthermore, since the heat exchange fluid only contacts one side of the battery cell, excessive contact between the heat exchange fluid and the battery cell avoids affecting its insulation, thus preventing the risk of short circuits caused by the heat exchange fluid.

[0071] The technical solutions described in the embodiments of this application are applicable to battery devices, electrical devices using battery devices, and energy storage devices using battery devices.

[0072] 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.

[0073] 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.

[0074] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 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 does not have any particular limitations.

[0075] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage devices that use the battery device as an energy storage element. Electrical devices include, for example, electric vehicles, cars, ships, and spacecraft; spacecraft include, for instance, airplanes, rockets, space shuttles, and spacecraft.

[0076] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings. The technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0077] For ease of description, this application uses the application of a battery device in a vehicle as an example for illustration.

[0078] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0079] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0080] refer to Figure 2 As shown, the battery device 100 mentioned in the embodiments of this application may include one or more battery assemblies for providing voltage and capacity. The battery assembly may include multiple battery cells 20, which are connected in series, parallel, or mixed connections via busbars.

[0081] In some embodiments, the multiple battery cells 20 in the battery device 100 can be electrically connected through a busbar to achieve parallel, series, or mixed connection of the multiple battery cells 20 in the battery device 100.

[0082] In some embodiments, the battery assembly is typically formed by arranging multiple battery cells 20; as an example, the battery assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 20 into a single module. As an example, a battery module can be formed by bundling multiple battery cells 20 together with cable ties.

[0083] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more battery components housed within the housing 10.

[0084] As an example, the battery assembly can be a battery module, which can be housed in the housing 10 by fixing the battery module in the housing 10.

[0085] As an example, the battery assembly can also be housed in the housing 10 by directly fixing multiple battery cells 20 to the housing 10.

[0086] As an example, the housing 10 may include an upper housing 11 and a lower housing 12. The upper housing 11 and the lower housing 12 are fastened together to form a closed space inside the housing 10 to house the battery cells 20. Here, "closed" means covered or closed, and can be either sealed or unsealed.

[0087] As an example, the housing 10 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 10 forms an enclosed space to house the battery assembly.

[0088] As an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, the top cover of the housing 10 can be at least part of the floor of the vehicle 1000, or the frame of the housing 10 can be at least part of the crossbeams and longitudinal beams of the vehicle 1000.

[0089] In some embodiments, the battery device 100 refers to an energy storage device, which includes a housing 10, and at least one side of the housing 10 has a door. The energy storage device includes energy storage containers, energy storage cabinets, etc., and the battery cells 20 in the energy storage device are used to store electrical energy.

[0090] Firstly, such as Figures 3 to 8 As shown, the battery device 100 provided in this application includes: a battery cell 20, a thermal management assembly 40, and a sealing portion 70.

[0091] The battery cell 20 has a first wall 21. Specifically, the battery cell 20 includes a housing, an electrode assembly, an end cap, and an electrolyte.

[0092] The housing has an open-end receiving space. An end cap is disposed at the opening and seals the opening. The outer casing includes an end cap and a housing, and the housing may have one or more openings. One or more end caps may also be provided. The outer casing may be a steel casing, an aluminum casing, a plastic casing (such as polypropylene), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the outer casing may be a sealed structure or a non-sealed structure. As an example, when the outer casing is a non-sealed structure, the outer casing serves to protect the electrode assembly, and a sealing bag is also included between the outer casing and the electrode assembly. The sealing bag is used to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte. The battery cell 20 also includes: an electrode terminal, which passes through the end cap. Exemplarily, the electrode terminal may be a post, and the electrode terminal is made of a conductive material to achieve the conductive function of the electrode terminal. The first wall 21 is a side wall of the housing. Optionally, the first wall 21 is the bottom wall of the housing, and the bottom wall is a wall surface opposite to the end cap.

[0093] The electrode assembly is housed within the housing space. The electrode assembly is the component in the battery cell 20 where the electrochemical reaction occurs. The housing may contain one or more electrode assemblies. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The separator is located between the negative and positive electrodes. The positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector. The negative electrode can be a negative electrode sheet, which may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector. During the charging and discharging process of the battery cell 20, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, located between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through. Furthermore, the electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked. The electrode assembly can be cylindrical, flat, or polygonal, etc. The electrode assembly has tabs that allow current to be drawn out from the electrode assembly. The electrode includes a positive electrode and a negative electrode, and the electrode is connected to the electrode terminal of the electrode post.

[0094] An electrolyte is disposed within a containment space. The electrolyte acts as a conductor of ions between the positive and negative electrodes. The electrolyte includes an electrolyte salt and a solvent. In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell 20, such as additives that improve the overcharge / fast charge performance of the battery cell 20, additives that improve the high-temperature performance of the battery cell 20, additives that improve the low-temperature performance of the battery cell 20, etc.

[0095] The thermal management component 40 includes a heat exchange plate 41 located on one side of the first wall 21, and having a heat exchange channel 42 within it. The heat exchange plate 41 has a fusible perforation portion 50 penetrating its wall, configured to melt in the event of thermal runaway of the battery cell 20. Specifically, the heat exchange component has at least one heat exchange channel 42 for conducting heat exchange fluid, which exchanges heat with the battery cell 20. Optionally, the heat exchange component is a metal plate, which possesses both good structural strength and good thermal conductivity. This means that while ensuring a certain heat exchange efficiency, the heat exchange plate 41 also possesses sufficient structural strength. Optionally, the heat exchange fluid is selected with a specific heat capacity of not less than 4.2 kJ / (kg). The insulating heat exchange fluid (temperature) is selected, such as an ethylene glycol-water mixture, to avoid electrolytic corrosion. In one specific embodiment of this application, the heat exchange plate 41 is provided with a second through hole 43 penetrating its wall. The second through hole 43 is filled with a sealing element, which forms a fusible penetration portion 50. Furthermore, the inner diameter of the second through hole 43 is 0.5mm-10mm, and can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, etc. 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5.1 mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6mm, 6.1mm, 6.2mm, 6.3mm, 6.4 mm, 6.5mm, 6.6mm, 6.7mm, 6.8mm, 6.9mm, 7mm, 7.1mm, 7.2mm, 7.3mm, 7.4mm, 7.5mm, 7.6mm, 7.7m The values ​​are any one point or a range of any two points from m, 7.8mm, 7.9mm, 8mm, 8.1mm, 8.2mm, 8.3mm, 8.4mm, 8.5mm, 8.6mm, 8.7mm, 8.8mm, 8.9mm, 9mm, 9.9mm, 9.2mm, 9.3mm, 9.4mm, 9.5mm, 9.6mm, 9.7mm, 9.8mm, 9.9mm, or 10mm. Additionally, the sealing element is made of a low-melting-point sealing material with a melting point of 130-150℃; optionally, the low-melting-point sealing material is a tin-bismuth alloy or a polymer material. The surface of the sealing element can be treated with a silane coupling agent, which enhances the surface adhesion between the sealing element and the wall of the second through hole 43, increasing it to over 15MPa.

[0096] The sealing part 70 is a continuous annular structure, surrounding the fusible perforation part 50, and connecting the first wall 21 and the heat exchange plate 41. The melting temperature of the fusible perforation part 50 is T1, and the melting temperature of the sealing part 70 is T2, where T1 < T2. When a battery cell experiences an abnormal temperature rise and reaches a preset threshold, the fusible perforation part 50 is the first to reach the melting trigger condition and melt, avoiding the risk of thermal runaway. Due to the temperature parameter limitation, the heat resistance temperature of the sealing part 70 is higher than the melting temperature of the fusible perforation part 50. During the melting process of the fusible perforation part 50, the sealing part 70 never reaches its critical melting temperature, maintaining its original structural strength, sealing performance, and morphological integrity. It avoids problems such as melting, deformation, cracking, or sealing failure, improving the overall structural reliability and operational safety.

[0097] When a battery cell 20 experiences thermal runaway due to extreme conditions such as internal short circuit, overcharging, over-discharging, external impact, or abnormal heating, a violent chemical reaction occurs inside the battery cell 20. During the reaction, a large amount of heat is rapidly released, causing the temperature of the battery cell 20 to rise sharply in a short period of time. The temperature continues to rise and exceeds the normal operating temperature range, rapidly approaching or even exceeding the melt-through trigger temperature of the fusible perforation section 50. At this time, the fusible perforation section 50 will quickly melt and break through in response to the high temperature stimulus. After the fusible perforation section 50 fails to melt through, a flow channel for the heat exchange fluid is formed on the heat exchange plate 41. Under the pressure inside the heat exchange channel, the heat exchange fluid passes through the flow channel and comes into direct contact with the first wall 21 (battery cell 20). Specifically, the heat exchange fluid in the heat exchange channel passes through the flow channel and comes into direct contact with the first wall under the pressure provided by the liquid pump. This contact method ensures efficient heat exchange between the heat exchange fluid and the thermally runaway battery cell 20, while strictly controlling the contact area to avoid contact between the heat exchange fluid and sensitive parts such as the multi-sided surface, tabs, and sealing interfaces of the battery cell 20.

[0098] The thermally runaway battery cell 20 continuously releases a large amount of heat. The heat exchange fluid in contact with it has characteristics such as high specific heat capacity and good thermal conductivity, which can quickly and directly absorb the heat released from the surface of the battery cell 20. This achieves efficient and rapid cooling of the thermally runaway battery cell 20, rapidly suppresses the continuous rise in temperature of the battery cell 20, slows down or even terminates the violent chemical reaction inside the battery cell 20, and reduces the heat release rate from the source. At the same time, it can also effectively reduce the diffusion of heat from the thermally runaway battery cell 20 to the surrounding area and conduction to adjacent battery cells 20, thereby suppressing the occurrence of heat propagation phenomenon, preventing the thermal runaway of a single battery cell 20 from escalating into a chain reaction of thermal runaway of multiple battery cells 20, and ultimately avoiding a complete thermal runaway of the entire battery device 100. This minimizes the risk of thermal runaway of the battery device 100 and ensures the overall reliability and stability of the battery device 100.

[0099] In addition, since the heat exchange fluid only contacts one side (first wall 21) of the battery cell 20, and this side can be pre-insulated and protected, and the heat exchange fluid itself is selected as a medium with excellent insulation properties, it can effectively avoid excessive contact between the heat exchange fluid and the battery cell 20, which would damage its surface insulation layer or contact with conductive parts such as the tabs. This fundamentally eliminates secondary hazards such as internal short circuits of the battery cell 20 and short circuits between adjacent battery cells 20 caused by the heat exchange fluid. While achieving efficient cooling and suppressing heat spread, it also takes into account the insulation reliability of the battery device 100, thus achieving multiple protections.

[0100] like Figure 4 and Figure 5 As shown, in some embodiments, there are multiple battery cells 20, and the heat exchange plate 41 includes multiple fusible perforation portions 50, with each battery cell 20 corresponding to at least one fusible perforation portion 50.

[0101] When any single battery cell 20 in the battery device experiences a rapid temperature rise due to abnormal operating conditions such as overcharging, short circuit, or internal short circuit, and is about to experience thermal runaway, the high-temperature heat released by the battery cell 20 can accurately and quickly act on the corresponding fusible perforation part 50, ensuring that at least one fusible perforation part 50 is effectively triggered and melted, thereby reliably opening the flow channel of the heat exchange fluid.

[0102] The above structure ensures the reliability of thermal runaway protection response and the effectiveness of triggering, preventing situations where a single battery cell 20 experiences thermal runaway without the fusible perforation section 50 activating or the protection fails, thus significantly improving the safety and stability of the battery system.

[0103] like Figure 4 and Figure 5 As shown, in some embodiments, there are multiple battery cells 20 and multiple sealing portions 70, with each battery cell 20 connected to at least one sealing portion 70, and the sealing portion 70 surrounding at least one fusible perforation portion 50.

[0104] When any single battery cell 20 in the battery module overheats due to abnormal operating conditions and is about to experience thermal runaway, the high-temperature heat generated by the battery cell 20 can be directed to the corresponding sealing part 70 area, causing at least one easily fusible part 50 in the sealing part 70 to reach the melting critical condition and melt rapidly and break through, thereby precisely opening the heat exchange fluid flow channel for the thermal runaway battery cell 20.

[0105] The above structure can quickly and efficiently manage the faulty battery cell 20 point-to-point when thermal runaway occurs, suppressing the rapid rise in temperature in time and preventing thermal runaway from spreading to adjacent battery cells 20. This not only ensures the timeliness and reliability of thermal protection response, but also improves the overall safety and operational stability of the battery module.

[0106] like Figure 5 As shown, in some embodiments of this application, in the thickness direction of the first wall 21, the sealing part 70 is located between the first wall 21 and the heat exchange plate 41.

[0107] The sealing part 70 is arranged in the assembly gap between the first wall 21 and the heat exchange plate 41, making full use of the existing space between the two to achieve a sealing fit. There is no need to set a separate sealing installation position on the outside of the structure, nor does it occupy additional external installation space. This maximizes the utilization rate of the internal space of the structure, effectively reduces the overall size of the structure, and avoids the increase in volume caused by the external and redundant arrangement of the sealing structure. This is significantly conducive to the miniaturization, compactness and integration of the overall structure.

[0108] Meanwhile, the sealing part 70 is bidirectionally clamped by the first wall 21 and the heat exchange plate 41, and is subjected to uniform compressive force during assembly. This ensures that the sealing part 70 is subjected to balanced force and no local stress concentration, allowing it to fit tightly and reliably with the mating surface, thus forming a continuous and stable sealing surface. Under conditions such as long-term use, vibration, impact, and assembly deviations, the sealing part 70 is not prone to problems such as force shift, compression failure, or loosening and falling off. It can always maintain a stable sealing state, effectively preventing heat exchange medium leakage and structurally ensuring the reliability and stability of the sealing fit.

[0109] like Figures 6 to 10 As shown, in some embodiments, an easily ablation portion 60 is further provided between the first wall 21 and the heat exchange plate 41. The easily ablation portion 60 is in contact with both the battery cell 20 and the heat exchange plate 41, and is ablated when the battery cell 20 experiences thermal runaway. Specifically, the easily ablation portion 60 is made of an easily ablation material that rapidly decomposes and ablates at temperatures above 150°C. The easily ablation material is at least one of polyoxymethylene (POM), polya-methylstyrene (PaMS), polycaprolactone (PCL), plasticized modified polylactic acid (PLA), high vinyl acetate content ethylene-vinyl acetate copolymer (EVA), low molecular weight polyether thermoplastic polyurethane (TPU), or thermosensitive degradable modified polyolefin.

[0110] When the high temperature of the battery cell 20 causes the easily ablated portion 60 to rapidly pyrolyze and ablate, the easily fusible portion 50 is affected by the pyrolysis of the easily ablated portion 60 and decomposes rapidly. That is, the easily ablated portion 60 plays a heat transfer role, so as to ensure that the easily fusible portion 50 melts through rapidly when the battery cell 20 experiences thermal runaway.

[0111] like Figure 6 As shown, in some embodiments of this application, the battery device includes a seal 101.

[0112] The sealing element 101 includes a body, on which a plurality of first through holes 102 are provided to form sealing ribs 103. The plurality of sealing ribs 103 surround and form a sealing portion 70. Specifically, sealing ribs 103 are formed between two adjacent first through holes 102 and between the first through holes 102 and the edge of the body.

[0113] The sealing part 70 is formed by multiple sealing ribs 103, which together constitute the overall support structure of the sealing part 70, effectively improving its mechanical strength and structural rigidity. Under conditions such as assembly and tightening, equipment operation vibration, external impact, and long-term pressure use, the sealing part 70 is not prone to structural deformation such as bending, twisting, collapse, or excessive elastic deformation, and can stably maintain its preset shape and size. At the same time, the high mechanical strength and rigidity can reduce the probability of damage and fatigue failure of the sealing part 70 during use, extend the service life of the sealing part 70, and structurally ensure the reliability and operational stability of the sealing part 70.

[0114] like Figures 7 to 10 As shown, in some embodiments of this application, the first wall 21, the heat exchange plate 41, and the sealing part 70 form a first cavity 30. The easily ablated part 60 fills the first cavity 30 and communicates with the easily meltable part 50. After the easily ablated part 60 undergoes rapid pyrolysis and ablation and then rapidly melts through, the heat exchange fluid flows rapidly into and fills the interior of the first cavity 30 through the channel formed by the melt-through, directly contacting the surface of the battery cell 20, and providing immediate and efficient direct cooling to the battery cell 20.

[0115] The structure of the first cavity 30 ensures a large-area, uniform contact between the battery cell 20 and the heat exchange fluid, significantly increasing the effective heat exchange area between them. At the same time, it significantly shortens the heat conduction path and greatly reduces the heat exchange resistance. The heat generated by the battery cell 20 can be quickly and directly transferred to the heat exchange fluid, achieving a significant improvement in heat dissipation speed and heat exchange efficiency. This rapidly suppresses the temperature rise of the battery cell 20, avoids local overheating that could lead to thermal runaway, and effectively improves the heat dissipation capacity and operational safety of the battery system.

[0116] When a battery cell 20 experiences thermal runaway due to extreme conditions such as internal short circuit, overcharging, over-discharging, external impact, or abnormal heating, a violent chemical reaction occurs inside the battery cell 20. During this reaction, a large amount of heat is rapidly released, causing the battery cell 20's temperature to rise sharply in a short period. The temperature continues to climb and exceeds the normal operating temperature range, rapidly approaching or even exceeding the pyrolysis trigger temperature of the easily ablated portion 60. At this point, the easily ablated portion 60 responds quickly to the high-temperature stimulus, undergoing a rapid pyrolysis and ablation reaction within the first cavity 30. During pyrolysis, it completely decomposes into soft, shapeless ash, leaving no hard residue. This prevents blockage or obstruction of the subsequent flow of heat exchange fluid or the conductivity of the through-holes, ensuring the smoothness of the entire cooling process.

[0117] During the pyrolysis of the easily ablated part 60, the easily ablated part 60 also simultaneously conducts a large amount of absorbed heat to the sealing component. The sealing component will quickly reach its own melting temperature, undergoing thermal softening and melting failure, and losing its original sealing ability. Since the sealing component was originally used to seal the second through hole 43, after its melting failure, it will no longer block and seal the second through hole 43. The second through hole 43 is quickly and completely opened, forming a channel for the heat exchange fluid to flow. Moreover, since there is no hard residue in the easily ablated part 60, the through hole will not be blocked by residue, ensuring that the heat exchange fluid can pass through quickly. After the second through hole 43 is opened, the heat exchange fluid in the heat exchange fluid flow channel flows quickly and continuously into the first cavity 30 through the opened second through hole 43, accurately reaching the area where the thermal runaway battery cell 20 is located. The heat exchange fluid flows into the first cavity 30 and comes into direct contact with the first wall 21 (battery cell 20). This contact method ensures efficient heat exchange between the heat exchange fluid and the thermally runaway battery cell 20, while strictly controlling the contact area to avoid contact between the heat exchange fluid and sensitive parts such as the multi-sided surface, tabs, and sealing interfaces of the battery cell 20.

[0118] like Figure 6 As shown, in some embodiments of this application, each battery cell 20 is coupled to a first cavity 30.

[0119] Each battery cell 20 is provided with an independent first cavity 30, an easily ablated portion 60, and a sealing component. Each first cavity 30 is isolated from each other and operates independently without interfering with each other. When only one battery cell 20 in the battery device 100 experiences thermal runaway due to abnormal operating conditions, only the high temperature generated by the thermally runaway battery cell 20 will directly act on the easily ablated portion 60 in its corresponding first cavity 30, while the other normally operating battery cells 20 and their corresponding first cavities 30 remain within the normal temperature range, and the easily ablated portion 60 inside maintains structural integrity and does not undergo pyrolysis response. Under the high temperature of the thermal runaway battery cell 20, only its corresponding easily ablated part 60 is rapidly heated and undergoes pyrolysis and ablation, resulting in structural collapse. This triggers the melting of the corresponding sealing component and the opening of the second through hole 43. The heat exchange fluid flows only directionally into the first cavity 30 where the single thermal runaway battery cell 20 is located, directly contacting the thermal runaway battery cell 20 to achieve targeted cooling. The other first cavities 30 remain sealed, and the heat exchange fluid does not leak or flow in accidentally. Through the above-mentioned one-to-one independent triggering and precise response mechanism, dedicated, precise, and efficient cooling and heat dissipation can be achieved for the thermal runaway battery cell 20, quickly suppressing its continuous temperature rise and blocking the outward diffusion of heat. At the same time, unnecessary intervention or impact on normal battery cells 20 is avoided. This fundamentally prevents the malfunction of the entire protection structure caused by local thermal runaway, effectively preventing the thermal runaway of a single battery cell 20 from escalating into a chain reaction of thermal runaway of the entire battery device 100, and significantly improving the accuracy and operational reliability of the thermal runaway protection of the battery device 100.

[0120] In another embodiment of this application, the same first cavity 30 may correspond to multiple battery cells 20. Optionally, one first cavity 30 may correspond to 2 to 3 battery cells 20.

[0121] In some embodiments of this application, the sealing part 70 is an elastic plate. Optionally, the sealing part 70 is a high-temperature resistant sealing ring, and the sealing part 70 is made of high-temperature resistant silicone rubber with a temperature resistance of not less than 1000°C.

[0122] The elastic plate possesses elastic deformation and rebound capabilities. During battery assembly, transportation, vehicle operation, and vibration conditions, it effectively absorbs and buffers external vibration and impact loads, dissipating dynamic loads through elastic deformation. Compared to traditional rigid support structures, the elastic plate achieves flexible support and contact, preventing rigid collisions, hard impacts, and localized stress concentrations between the rigid support and the battery cells 20 and heat exchange plates 41. This effectively prevents deformation, displacement, or structural damage to the battery cell 20 casing and heat exchange plates 41 due to compression or impact, while ensuring a stable and continuous fit between the battery cells 20 and the easily ablated parts 60 and heat exchange plates 41. Through these structural and functional features, the overall structural stability, vibration resistance, and impact resistance of the battery device 100 are significantly improved, ensuring the long-term reliable operation of battery thermal management and thermal runaway protection structures.

[0123] In some embodiments of this application, the battery cell 20 presses against the elastic plate, causing the elastic plate to compress and deform. The compression rate of the elastic plate is 10%-50%, and the battery cell 20 and the compressed and deformed elastic plate are pressed together. The compression rate of the elastic plate can be any single value or a range of any two values ​​from 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, or 50%.

[0124] If the compression ratio is less than 10%, the elastic plate deformation is insufficient, the contact pressure between the plate and the battery cell 20 is low, the fit is not tight, the sealing effect is poor, and gaps are easily generated, leading to heat exchange fluid leakage.

[0125] If the compression ratio is greater than 50%, the elastic plate is in an over-compressed state, which is prone to elastic fatigue, creep relaxation or even permanent plastic deformation, and loses elastic recovery and continuous sealing ability. After long-term use, the support is prone to loosening and the seal fails.

[0126] With a compression ratio of 10%-50%, the elastic plate can generate a moderate and stable elastic preload, which can ensure sufficient contact pressure between the plate and the battery cell 20, eliminate gaps in the fit, improve the sealing effect, and reduce the risk of heat exchange fluid leakage. It can also retain sufficient elastic margin to achieve vibration damping, shock absorption, and adaptive compensation for the assembly tolerance and charge / discharge expansion of the battery cell 20.

[0127] Specifically, a compression rate between 10% and 50% creates a uniform and sufficient contact pressure (sealing contact pressure of 0.5-1.2 MPa) between the elastic plate and the battery cell 20, effectively eliminating minor gaps that may arise due to assembly tolerances, dimensional deviations, or structural deformation. This results in a continuous and tight sealing interface between the elastic plate and the battery cell 20. With a reasonable increase in the compression of the elastic plate, the contact pressure between the battery cell 20 and the elastic plate increases accordingly, further improving the tightness of the sealing interface and significantly enhancing the continuity and reliability of the sealing path. This structurally blocks potential leakage channels for the heat exchange fluid. When the battery cell 20 experiences thermal runaway and the heat exchange fluid flows into the first cavity 30 for cooling, the aforementioned high-pressure strong sealing can effectively resist the fluid pressure and scouring effect of the heat exchange fluid, significantly reducing the probability of lateral leakage of the heat exchange fluid from the gap between the battery cell 20 and the elastic plate. This ensures that the heat exchange fluid remains stably inside the first cavity 30 and fully contacts the battery cell 20 for heat exchange, guaranteeing the effectiveness of thermal runaway cooling and avoiding problems such as short circuits and corrosion caused by heat exchange fluid leakage, thereby improving the overall sealing reliability and operational reliability of the battery device 100.

[0128] Compression ratio refers to the percentage reduction in thickness of an elastic plate under assembled compression conditions compared to its original thickness in the free state. The calculation formula is: Compression ratio = (Original thickness in free state - Actual thickness after assembly) ÷ Original thickness in free state × .

[0129] In another embodiment of this application, the sealing part 70 is made of high-temperature resistant adhesive. Specifically, high-temperature resistant adhesive is applied to the heat exchange plate 41, and part of the high-temperature resistant adhesive is removed to form a groove. After the high-temperature resistant adhesive solidifies, the easily ablated part 60 is filled into the groove, and then the battery cell 20 is installed on the high-temperature resistant adhesive. The battery cell 20 seals the groove to form the first cavity 30.

[0130] In some embodiments of this application, such as Figure 6 and Figure 7 As shown, a heat insulation pad 90 is provided between two adjacent battery cells 20. Taking a prismatic battery cell 20 as an example, the prismatic battery cell includes a top wall and a bottom wall arranged opposite each other, and a side wall located between the top wall and the bottom wall. The side wall includes a first wall and a second wall arranged opposite each other. The area of ​​the first wall is larger than the area of ​​the second wall. The heat insulation pad 90 is located between the two second walls of the adjacent battery cells, and the size of the heat insulation pad 90 is completely matched with the size of the second wall of the prismatic battery cell. The heat insulation pad 90 blocks lateral heat radiation, effectively suppresses heat spread and diffusion, and prevents the thermal runaway of a single battery cell 20 from escalating into a chain thermal runaway of multiple battery cells 20.

[0131] In some embodiments of this application, the easily ablated portion 60 includes a substrate and thermally conductive particles. Specifically, the thermally conductive particles increase the room-temperature thermal conductivity of the easily ablated portion 60 to 15-30 W / (m²). K). The thermally conductive particles can be porous aluminum nitride ceramic particles or graphene particles, and the particle size of the thermally conductive particles is smaller than the pore size of the second through hole 43.

[0132] The heat-conducting particles have a high thermal conductivity. When they are evenly dispersed inside the easily ablated portion 60, they will contact and overlap each other to form a continuous heat-conducting network. This is equivalent to building multiple efficient heat transfer channels inside the easily ablated portion 60, which can effectively shorten the heat transfer path, reduce the heat transfer resistance inside the easily ablated portion 60, and enable heat to be conducted quickly and smoothly inside the easily ablated portion 60. This significantly improves the heat transfer rate and uniformity of the easily ablated portion 60, thereby ensuring the heat exchange efficiency between the heat exchange plate 41 and the battery cell 20, ensuring sufficient cooling of the battery cell 20, achieving rapid temperature control of the battery cell 20, improving the cycle life and reliability of the battery cell 20, and providing a guarantee for the long-term reliable operation of the battery device 100.

[0133] In some embodiments of this application, the sum of the volumes of all heat-conducting particles is 30%-50% of the total volume of the easily ablated portion 60. The percentage of the sum of the volumes of the heat-conducting particles to the total volume of the easily ablated portion 60 can be any single value or a range of any two values ​​from 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, or 50%.

[0134] If the sum of the volumes of all the heat-conducting particles is less than 30% of the total volume of the easily ablated part 60, the amount of heat-conducting particles added is too small and the volume ratio is too low. Therefore, a continuous and effective heat conduction path cannot be formed inside the easily ablated part 60. The heat-conducting particles will not significantly improve the thermal conductivity of the easily ablated part 60 and will also increase the manufacturing cost of the product.

[0135] If the sum of the volumes of all the heat-conducting particles is greater than 50% of the total volume of the easily ablated part 60, the amount of heat-conducting particles added is too large and the volume ratio is too high. Although it can improve the thermal conductivity to a certain extent, it will significantly reduce the volume of the matrix material of the easily ablated part 60, reduce the structural strength and pyrolysis integrity of the easily ablated part 60, and the volume of the heat-conducting particles remaining after pyrolysis is too large, which will severely compress the effective volume of the first cavity 30, reduce the heat exchange fluid capacity and flow space, and may even block the second through hole 43 and the internal flow channel, resulting in insufficient heat exchange fluid supply and poor flow, significantly reducing the cooling effect and failing to stop the thermal runaway diffusion in time.

[0136] The total volume of all heat-conducting particles is 30%-50% of the total volume of the easily ablated part 60. The heat-conducting particles can form a continuous and efficient heat conduction path inside the easily ablated part 60, effectively reducing the thermal resistance and improving the conventional heat exchange efficiency between the battery cell 20 and the heat exchange plate 41. Moreover, the heat-conducting particles will not occupy too much volume of the easily ablated part 60. After the easily ablated part 60 is rapidly pyrolyzed and ablated, the remaining heat-conducting particles are small in volume and will not excessively occupy the effective space of the first cavity 30, thereby ensuring that the first cavity 30 can hold a sufficient amount of heat exchange fluid, so that the heat exchange fluid can fully contact the thermally runaway battery cell 20 and achieve efficient cooling.

[0137] In some embodiments of this application, the porosity of the easily ablated portion 60 is 30%-50%. The porosity can be any single value or a range of any two values ​​from 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, or 50%.

[0138] If the porosity of the easily ablated part 60 is less than 30%, the internal structure of the easily ablated part 60 is too small, the number of pores is small and it is difficult to form a through heat transfer channel. The matrix material can only be exposed to a limited extent on the outer surface, and the heat can only be slowly conducted from the surface to the inside. The thermal resistance is large and the heat transfer is lagging. It is very easy to have a gradient temperature difference where the surface has reached the thermal decomposition temperature while the internal temperature is significantly lower. This results in the overall slow heating of the easily ablated part 60 and a delayed thermal trigger response. The heat exchange fluid cannot intervene to cool down in time, miss the opportunity to suppress the initial stage of thermal runaway, and increase the risk of thermal spread.

[0139] If the porosity of the easily ablated part 60 is greater than 50%, the excessive porosity of the easily ablated part 60, although it can increase the heat penetration rate, will lead to a low proportion of matrix material, a thin internal skeleton structure, and a significant decrease in overall mechanical strength, stiffness and support capacity. Under the action of assembly stress, expansion force of battery cell 20 and vibration load, it is prone to compression deformation, collapse, loosening or even breakage. This will cause uneven pyrolysis of the easily ablated part 60 and delayed thermal trigger response, and the heat exchange fluid will not be able to intervene in time to cool down, missing the opportunity to suppress the initial stage of thermal runaway and increasing the risk of thermal spread.

[0140] The porosity of the easily ablated part 60 is within 30%-50%. A continuous and interconnected porous structure is formed inside the easily ablated part 60, which greatly increases the overall specific surface area and exposes a large area of ​​the internal matrix material. Heat can quickly penetrate to the deep area of ​​the easily ablated part 60 through the pore channels, shortening the heat transfer path and reducing the internal temperature difference. This enables the easily ablated part 60 to heat up uniformly and synchronously throughout, reaching the thermal decomposition temperature in a shorter time. At the same time, the porous structure allows the pyrolysis reaction to be triggered synchronously at multiple points inside, improving the pyrolysis rate and sufficiency. This ensures that the easily ablated part 60 is rapidly and thoroughly pyrolyzed, ablated, and disintegrated, avoiding structural residues that block the flow channels. This provides a reliable guarantee for the subsequent melting of the sealing components and the inflow of heat exchange fluid for cooling.

[0141] In some embodiments of this application, the easily ablated portion 60 fills at least 90% of the volume of the first cavity 30. The percentage of the volume of the easily ablated portion 60 filling the first cavity 30 can be any one value or a range of any two values ​​from 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100%.

[0142] Specifically, during the process of the easily ablated portion 60 being filled into the first cavity 30, large air bubbles may be generated. These air bubbles will occupy a certain volume of the first cavity 30. Therefore, the easily ablated portion 60 may not be able to completely fill the first cavity 30.

[0143] By limiting the volume of the easily ablated portion 60 to the above range, the material volume of the easily ablated portion 60 is matched with the thermal response speed, which can ensure effective support and heat conduction and heat exchange for the battery cell 20 under normal operating conditions, and can be rapidly and fully heated under the action of thermal runaway high temperature. The easily ablated portion 60 can rapidly undergo synchronous pyrolysis ablation throughout the entire area in the early stage of thermal runaway.

[0144] like Figures 8 to 10 As shown, in some embodiments of this application, the easily ablated portion 60 contacts the battery cell 20 and the heat exchange plate 41 respectively.

[0145] The easily ablated part 60 is in close contact with the heat exchange plate 41 and the battery cell 20 respectively. By eliminating the interface gap and air insulation layer, efficient and direct heat exchange is achieved between the easily ablated part 60 and the heat exchange plate 41, and between the easily ablated part 60 and the battery cell 20. This avoids a significant increase in heat transfer resistance due to poor contact or gaps, thereby ensuring the performance and reliability of the battery device 100 from both the perspectives of conventional heat exchange and thermal runaway response.

[0146] Specifically, during the normal charging and discharging operation of the battery cell 20, the heat generated by the battery cell 20 can be quickly transferred to the easily ablated part 60 through the direct contact interface, and then efficiently conducted to the heat exchange plate 41 by the easily ablated part 60. The heat is then continuously carried away by the heat exchange fluid in the internal flow channel of the heat exchange plate 41. At the same time, the cooling capacity of the heat exchange plate 41 can also be transferred to the battery cell 20 in the reverse direction through the same path, so as to achieve precise control and uniform heat dissipation of the temperature of the battery cell 20, greatly improve the overall heat exchange efficiency between the heat exchange plate 41 and the battery cell 20, avoid local heat accumulation, ensure that the battery cell 20 is always in a suitable operating temperature range, and improve the battery life and operating stability.

[0147] When the battery cell 20 experiences thermal runaway and its temperature rises sharply, the close contact between the battery cell 20 and the easily ablated part 60 can instantly and efficiently transfer high-temperature heat to the entire area of ​​the easily ablated part 60, enabling the easily ablated part 60 to reach the thermal decomposition temperature synchronously within a short period of time. This rapidly triggers and completes the full-area pyrolysis and structural collapse, ensuring that the easily ablated part 60 decomposes in a timely and thorough manner without any large undecomposed residues. This creates the necessary conditions for the subsequent melting and opening of the sealing components and the flow of heat exchange fluid into the first cavity 30 for direct cooling. From the heat transfer path, this ensures the response speed and reliability of the thermal runaway protection mechanism and effectively suppresses the spread of heat.

[0148] like Figure 8 As shown, in some embodiments of this application, the width D connecting the first wall 21 and the sealing part 70 in the direction perpendicular to the thickness of the first wall 21 is not less than 5 mm.

[0149] The aforementioned dimensional design ensures a sufficiently large effective contact area between the battery cell 20 and the sealing part 70. This ample contact area allows for a continuous and tight fit between the battery cell 20 and the sealing part 70, effectively eliminating assembly gaps and significantly improving the overall sealing performance of the first cavity 30, preventing heat exchange fluid leakage from the mating gaps. Simultaneously, the larger contact area disperses the assembly forces, vibrations, and impact loads on the battery cell 20, providing uniform and stable circumferential support and preventing localized stress concentration that could lead to deformation, displacement, or damage to the battery cell 20 casing. This ensures reliable positioning and effective support for the battery cell 20, thereby guaranteeing the overall structural stability and operational reliability of the battery module.

[0150] In some embodiments of this application, such as Figure 8 As shown, the second through hole 43 includes a first end near the first cavity 30 and a second end communicating with the heat exchange channel 42. The diameter of the first end is smaller than the diameter of the second end.

[0151] Under normal operating conditions at room temperature, the heat exchange channel 42 will generate continuous or instantaneous fluid pressure due to the flow of heat exchange fluid, changes in ambient temperature, or fluctuations in system pressure. This pressure will act along the axial direction of the second through hole 43 on the side of the sealing member facing the heat exchange channel 42, forming an axial thrust that pushes the sealing member toward the first cavity 30. The irregularly shaped structure of the sealing component, with one end larger than the other, forms an axial mechanical limit and radial locking constraint with the variable-diameter inner wall of the second through hole 43. This effectively counteracts the tendency to detach due to fluid pressure, limiting the sealing component from axial movement, slippage, or even complete detachment from the second through hole 43. This fundamentally avoids the risk of the sealing component detaching or shifting from the second through hole 43 due to pressure within the heat exchange channel 42. Simultaneously, the irregularly shaped fitting structure increases the sealing contact area between the sealing component and the second through hole 43, extends the sealing path, and further improves the interface sealing effect. This ensures that the heat exchange fluid in the heat exchange channel 42 will not leak abnormally through the second through hole 43 at room temperature, maintaining the sealed environment of the first cavity 30 and the normal operating conditions of the battery cell 20. Even under complex operating conditions such as long-term vibration, pressure fluctuations, and thermal cycling, this structure can still maintain the stability of the sealing component's position and the tight fit of the sealing interface, significantly improving the sealing reliability and structural stability of the sealing component at room temperature. This provides a reliable structural guarantee for the normal operation of the battery device 100 before thermal runaway is triggered.

[0152] In some embodiments of this application, such as Figure 8 As shown, the diameter of the second through hole 43 gradually decreases. Specifically, the included angle α between the two lines formed by the plane passing through the hole axis of the second through hole 43 and the hole wall of the second through hole 43 is 30°-60°. The included angle α can be any single value or a range of any two values ​​from 30°, 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59° or 60°.

[0153] The sealing element inside the second through hole 43 is frustum-shaped. The continuous annular sealing surface of the frustum-shaped sealing element can form a longer and more continuous sealing path, effectively avoiding the risk of leakage caused by local gaps or poor contact. Moreover, the self-tightening characteristic of the conical surface makes the sealing reliability more effective as the clamping force / fluid pressure increases. Even under conditions such as pressure fluctuations, fluid impacts, or long-term operating vibrations in the heat exchange channel 42, the sealing interface can still maintain a continuous and stable fit, and there will be no problems such as sealing failure, loosening, or leakage due to pressure changes or vibration impacts. It can reliably seal the second through hole 43 under normal temperature and normal operating conditions, preventing the heat exchange fluid from abnormally leaking from the second through hole 43 into the first cavity 30. This ensures both the sealing performance and stability of the heat exchange system and provides a dry and stable working environment for the battery cell 20.

[0154] In some embodiments of this application, such as Figure 9 As shown, the portion of the sealing part 70 connected to the first wall 21 has a weak area 71. The connection strength between the sealing part 70 and the first wall 21 at the weak area 71 is less than the connection strength between the sealing part 70 and the first wall 21 at other connection areas. The weak area 71 is configured to form a pressure-reducing channel when the pressure within the space enclosed by the sealing part 70 is greater than a preset pressure. Specifically, the pressure-reducing channel allows gas within the space enclosed by the sealing part 70 to pass through and be discharged smoothly, achieving cavity depressurization. At the same time, it forms a barrier to the liquid heat exchange fluid, preventing liquid outflow. Thus, while achieving depressurization and exhaust, it prevents heat exchange fluid leakage, ensuring continuous and effective contact between the heat exchange fluid and the battery cell 20, and maintaining efficient cooling.

[0155] When the battery cell 20 experiences thermal runaway, the easily ablated portion 60 within the space enclosed by the sealing portion 70 undergoes rapid pyrolysis and ablation under high temperature, potentially generating gas. This gas accumulates continuously within the sealed space enclosed by the sealing portion 70, directly causing the pressure within the space enclosed by the sealing portion 70 to rise continuously.

[0156] If the pressure inside the space enclosed by the sealing part 70 is too high and cannot be released in time, the pyrolysis gas will accumulate on the surface of the battery cell 20 and at the heat exchange interface, forming a heat insulation gas film or gas barrier layer, which will occupy the effective contact space and flow path of the heat exchange liquid, hinder the direct and sufficient contact between the heat exchange liquid and the surface of the battery cell 20, greatly weaken the heat transfer efficiency, and thus affect the cooling effect on the thermal runaway battery cell 20.

[0157] Therefore, a weak zone 71 is set at a preset location. When the pressure inside the space enclosed by the sealing part 70 rises to the design threshold due to the accumulation of pyrolysis gas, the pressure inside the cavity will act on the weak zone 71, causing it to crack, break, deform, or penetrate first, thereby quickly forming a pressure-reducing channel connecting the inside and outside of the space enclosed by the sealing part 70. Driven by the pressure inside the cavity, the pyrolysis gas can be discharged outward in a timely and smooth manner through this pressure-reducing channel, realizing rapid pressure relief of the space enclosed by the sealing part 70.

[0158] Through the above-mentioned adaptive pressure relief design, the pyrolysis gas can be effectively prevented from lingering and accumulating in the space enclosed by the sealing part 70, eliminating the obstruction effect of the gas on the heat exchange interface, ensuring that the heat exchange fluid can continuously and stably contact the surface of the battery cell 20, ensuring that the heat transfer path is unobstructed, maintaining high heat exchange efficiency, thereby ensuring timely and effective cooling of the thermal runaway battery cell 20, while preventing problems such as expansion and cracking of the space structure enclosed by the sealing part 70 and sealing failure caused by excessive pressure in the cavity, thus improving the operational reliability and thermal runaway protection reliability of the battery device 100.

[0159] In some embodiments of this application, the sealing portion 70 is bonded to the first wall 21, and the bonding strength of the weak area 71 is less than that of other bonding areas. Specifically, the sealing portion 70 is bonded to the battery cell 20 by high-temperature ceramic adhesive. In addition, the sealing portion 70 is bonded to the first wall 21 by high-temperature ceramic adhesive, and the bonding strength of the high-temperature ceramic adhesive at 200°C is not less than 2.0 MPa.

[0160] This structure employs a differentiated adhesive strength design at preset mating locations, pre-setting adhesive areas with relatively low adhesive strength. These areas serve as weak trigger points for adaptive adjustment of cavity pressure. When the pressure within the space enclosed by the sealing part 70 rises to a preset threshold, the force generated by the cavity pressure will directly act on the area with lower adhesive strength, causing adhesive failure and detachment. This, in turn, forms a pressure-reducing channel connecting the inside and outside of the space enclosed by the sealing part 70 at that location.

[0161] In some embodiments of this application, the sealing part 70 is pressed against the first wall 21, and the pressure in the weak area 71 is less than the pressure in other pressing areas (optionally, the height of the sealing part 70 in the weak area 71 is less than the height of the sealing part 70 in other areas).

[0162] In this structure, a pre-set crimping area with relatively low crimping strength is provided at the assembly and joint part of the space enclosed by the sealing part 70. This area serves as a preset trigger point for adaptive pressure relief of the cavity. When the pressure inside the space enclosed by the sealing part 70 rises to the design threshold, the high pressure inside the cavity will apply a continuous peeling and pushing force to this area with low crimping strength, causing the crimped fit in this area to separate, thereby forming a pressure reduction channel at this location that connects the interior of the space enclosed by the sealing part 70 with the heat exchange channel 42 or the outside.

[0163] In some embodiments of this application, such as Figure 9 As shown, the connection area between the sealing part 70 and the first wall 21 at the weak area 71 is smaller than the connection area between the sealing part 70 and the first wall 21 at other connection areas.

[0164] In this structure, a relatively small structural area is pre-set at the mating connection point within the space enclosed by the sealing part 70. This area, due to its smaller effective connection / fitting area, has relatively weaker structural rigidity and deformation resistance, serving as a pre-set trigger point for pressure response. When the pressure within the space enclosed by the sealing part 70 rises to the design threshold, the high pressure within the space enclosed by the sealing part 70 will exert a continuous pushing and peeling effect on this small connection area, causing controllable structural deformation (such as local warping, mating surface separation, gap expansion, etc.). This results in the formation of a pressure-reducing channel at the deformation location, connecting the interior of the space enclosed by the sealing part 70 with the exterior / heat exchange channel 42.

[0165] The aforementioned weak area 71 can also be a micropore or microslit. The micropore or microslit allows gas in the space enclosed by the sealing part 70 to pass through and be discharged smoothly, thereby achieving cavity depressurization. At the same time, it forms a barrier to the liquid heat exchange fluid, preventing the liquid from flowing out from the micropore or microslit. Thus, while achieving depressurization, it prevents the heat exchange fluid from leaking out, ensuring that the heat exchange fluid and the battery cell 20 are in continuous and effective contact, and maintaining efficient cooling.

[0166] In some embodiments of this application, such as Figure 10 As shown, protrusions are formed on the surface of the heat exchange plate 41, and these protrusions constitute a sealing portion 70. Optionally, the heat exchange channel 42 has protrusions formed on the wall of the heat exchange plate 41.

[0167] The aforementioned configuration increases the effective contact area between the heat exchange fluid and the heat exchange plate 41 within the space enclosed by the sealing part 70. The heat exchange fluid can not only contact and exchange heat with the main bottom area of ​​the heat exchange plate 41, but also directly and fully adhere to the extended area of ​​the heat exchange plate 41, which serves as the sealing part 70. This increased contact area significantly enhances the heat exchange rate between the heat exchange fluid and the heat exchange plate 41. Within a unit of time, the heat exchange fluid can rapidly and efficiently transfer the large amount of heat absorbed from the thermally runaway battery cell 20 to the heat exchange medium within the flow channel of the heat exchange plate 41. This prevents the heat exchange fluid from accumulating heat, leading to a rise in temperature and a decrease in cooling capacity, thus maintaining a consistently efficient heat absorption and dissipation cycle. This ensures that the heat exchange fluid maintains a consistently low operating temperature and strong heat absorption capacity, continuously and rapidly absorbing heat from the thermally runaway battery cell 20 within the space enclosed by the sealing part 70. This timely and effective cooling of the thermally runaway battery cell 20 ensures the timeliness and reliability of thermal runaway protection from the perspective of heat exchange efficiency, effectively preventing the spread of heat.

[0168] In some embodiments of this application, such as Figure 11 As shown, the battery device 100 also includes a thermal runaway detector 81 and a control element 82. Optionally, both the thermal runaway detector 81 and the control element 82 are disposed on the battery device.

[0169] The thermal runaway detector 81 is configured to send an electrical signal when thermal runaway occurs in the battery cell 20.

[0170] The control unit 82 is connected to both the thermal runaway detector 81 and the thermal management assembly 40. The control unit 82 is configured to control and reduce the pressure of the heat exchange fluid within the heat exchange channel 42 based on an electrical signal. The pressure of the heat exchange fluid is greater than the pressure within the area surrounding the sealing portion. Specifically, the control unit 82 is connected to a liquid pump in the thermal management assembly 40. This connection is used to reduce the liquid pump's supply pressure, thereby reducing the pressure of the heat exchange fluid within the heat exchange channel 42.

[0171] When a battery cell 20 experiences thermal runaway, the heat exchange fluid comes into direct contact with the high-temperature surface of the battery cell 20 and is forced to cool down. During this process, heat exchange fluid vapor is generated due to the absorption of a large amount of heat. If this vapor accumulates in the space enclosed by the sealing part 70, it can easily form a vapor insulation layer, encroaching on the flow space of the heat exchange fluid. This, in turn, hinders the direct contact and heat transfer between the heat exchange fluid and the battery cell 20 and the heat exchange plate 41, reducing heat exchange efficiency and cooling effect.

[0172] The thermal runaway detector 81 monitors the operating status of the battery cell 20 in real time. When thermal runaway is detected in the battery cell 20, it immediately outputs a corresponding electrical signal to the controller 82. Upon receiving the electrical signal, the controller 82 adjusts the pumping pressure of the thermal management component 40 in real time to control the pressure of the heat exchange fluid in the heat exchange channel 42, thus creating smooth flow conditions for the discharge of liquid vapor. The thermal management component 40 can adopt existing solutions, which will not be described in detail here.

[0173] Under the combined effect of pressure regulation and the steam's own pressure, the liquid vapor generated by the cooling of the heat exchange fluid can directly enter the heat exchange channel 42 inside the heat exchange plate 41 through the second through hole 43, and flow together with the mainstream of the heat exchange fluid in the heat exchange channel 42. Finally, it is discharged to the outside through the outlet of the thermal management component 40, realizing the immediate guidance and discharge of liquid vapor. Through the above-mentioned synergistic design of in-situ steam generation, immediate guidance, and directional discharge, the stagnation and accumulation of liquid vapor in the space enclosed by the sealing part 70 can be effectively avoided, eliminating the obstruction effect of steam on the heat exchange interface, ensuring that the heat exchange fluid always maintains sufficient and direct contact with the battery cell 20 and the heat exchange plate 41, maintaining the heat absorption and heat dissipation efficiency of the heat exchange fluid, ensuring the continuous and efficient cooling capability of the thermal runaway battery cell 20, and ensuring the reliability of thermal runaway suppression and heat propagation prevention.

[0174] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0175] According to some embodiments of this application, such as Figures 3 to 8 As shown, the battery device 100 provided in this application includes: a battery cell 20, a thermal management assembly 40, and a sealing portion 70.

[0176] The battery cell 20 has a first wall 21. The first wall 21 is the bottom wall of the battery cell 20.

[0177] The thermal management assembly 40 includes a heat exchange plate 41 located on one side of the first wall 21, and a heat exchange channel 42 disposed therein. The heat exchange plate 41 has a fusible perforation portion 50 penetrating its wall, configured to melt in the event of thermal runaway of the battery cell 20. Specifically, the heat exchange plate 41 has a second through-hole 43 penetrating its wall, and a sealing member is filled within the second through-hole 43, forming the fusible perforation portion 50. The sealing member is disposed within the second through-hole 43 and configured to melt in the event of thermal runaway of the battery cell 20, allowing the heat exchange fluid within the heat exchange plate 41 to enter the space enclosed by the sealing portion 70 through the second through-hole 43.

[0178] The sealing part 70 has a continuous annular structure and is arranged around the fusible perforation part 50. The sealing part 70 connects the first wall 21 and the heat exchange plate 41. The melting temperature of the fusible perforation part 50 is T1, and the melting temperature of the sealing part 70 is T2, wherein T1 < T2.

[0179] The battery device includes a seal 101. The seal 101 includes a body, on which a plurality of first through holes 102 are provided to form sealing ribs 103, and the plurality of sealing ribs 103 surround to form a sealing portion 70.

[0180] The sealing part 70 is an elastic plate. The battery cell 20 presses against the elastic plate, causing the elastic plate to compress and deform. The compression rate of the elastic plate is 10%-50%. The battery cell 20 and the compressed and deformed elastic plate are pressed together.

[0181] The first wall 21, the heat exchange plate 41 and the sealing part 70 are arranged to form a first cavity 30. The easily ablated part 60 is filled in the first cavity 30 and communicates with the easily fusible part 50. The easily ablated part 60 is configured to ablate when the battery cell 20 experiences thermal runaway, so that the first cavity 30 can contain the heat exchange fluid.

[0182] The easily ablated part 60 includes a substrate and thermally conductive particles, and the sum of the volumes of all thermally conductive particles is 30%-50% of the total volume of the easily ablated part 60.

[0183] The porosity of the easily ablated portion 60 is 30%-50%. The easily ablated portion 60 fills at least 90% of the volume of the first cavity 30. The easily ablated portion 60 is in contact with both the battery cell 20 and the heat exchange plate 41.

[0184] In the direction perpendicular to the thickness of the first wall 21, the width at which the first wall 21 connects with the sealing part 70 is not less than 5 mm.

[0185] The second through hole 43 includes a first end near the first cavity 30 and a second end connected to the heat exchange channel 42. The diameter of the second through hole 43 gradually decreases from the second end to the first end.

[0186] Each battery cell 20 is coupled to a first cavity 30.

[0187] The portion of the sealing part 70 that connects to the first wall 21 has a weak area 71. The connection area between the sealing part 70 and the first wall 21 at the weak area 71 is smaller than the connection area between the sealing part 70 and the first wall 21 at other connection areas.

[0188] like Figure 1 As shown, in a second aspect, embodiments of this application provide an electrical device including the aforementioned battery device 100, which is used to provide electrical energy.

[0189] It should be noted that the power-consuming device provided in this application embodiment has a battery device 100, and the power-consuming device has the beneficial effects of the battery device 100 in any of the aforementioned embodiments, which will not be repeated in this application embodiment.

[0190] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0191] 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 by, include: A battery cell, the battery cell having a first wall; A thermal management assembly, comprising a heat exchange plate located on one side of the first wall and having a heat exchange channel therein, the heat exchange plate having a fusible perforation portion penetrating its wall, the fusible perforation portion being configured to melt in the event of thermal runaway of a single battery cell; and A sealing part, wherein the sealing part is a continuous annular structure, the sealing part is arranged around the fusible perforation part, and the sealing part connects the first wall and the heat exchange plate; Wherein, the melting temperature of the easily fusible part is T1, and the melting temperature of the sealing part is T2, wherein T1 < T2.

2. The battery device according to claim 1, characterized in that, The number of battery cells is multiple, and the heat exchange plate includes multiple fusible perforation parts, with each battery cell corresponding to at least one of the fusible perforation parts.

3. The battery device according to claim 1, characterized in that, The number of battery cells is multiple, the number of sealing portions is multiple, each battery cell is connected to at least one sealing portion, and the sealing portion is arranged around at least one fusible perforation portion.

4. The battery device of claim 1, wherein include: A sealing element, the sealing element comprising a body having a plurality of first through holes to form sealing ribs on the body, the plurality of sealing ribs surrounding to form the sealing portion.

5. The battery device according to claim 1, characterized in that, In the thickness direction of the first wall, the sealing part is located between the first wall and the heat exchange plate.

6. The battery device according to claim 1, characterized in that, In the direction perpendicular to the thickness of the first wall, the width of the sealing part connected to the first wall is not less than 5 mm.

7. The battery device according to any one of claims 1 to 6, characterized in that, An easily ablation portion is provided between the first wall and the heat exchange plate. The easily ablation portion is in contact with the battery cell and the heat exchange plate respectively. The easily ablation portion is configured to ablate when the battery cell experiences thermal runaway.

8. The battery device according to claim 7, characterized in that, The first wall, the heat exchange plate, and the sealing part form a first cavity, and the easily ablated part fills the first cavity and communicates with the easily fusible part.

9. The battery device according to claim 7, characterized in that, The porosity of the easily ablated portion is 30%-50%.

10. The battery device according to claim 7, characterized in that, The melting temperature of the easily ablated part is T3, where T3 < T2.

11. The battery device according to any one of claims 1 to 6, characterized in that, The heat exchange plate is provided with a second through hole penetrating its wall, and the second through hole is filled with a sealing element, which forms the fusible perforation part.

12. The battery device according to claim 11, characterized in that, The second through hole includes a first end near the first wall and a second end communicating with the heat exchange channel, wherein the diameter of the first end is smaller than the diameter of the second end.

13. The battery device according to any one of claims 1 to 6, characterized in that, Also includes: A thermal runaway detector, configured to send an electrical signal when a battery cell experiences thermal runaway; as well as A control unit is connected to the thermal runaway detector and the thermal management component, respectively. The control unit is configured to control the reduction of the pressure of the heat exchange fluid in the heat exchange channel according to an electrical signal. The pressure of the heat exchange fluid is greater than the pressure in the area surrounding the sealing part.

14. The battery device according to any one of claims 1 to 6, characterized in that, The portion of the sealing part that connects to the first wall has a weak area. The connection strength between the sealing part and the first wall at the weak area is less than the connection strength between the sealing part and the first wall at other connection areas. The weak area is configured to form a pressure reduction channel when the pressure in the space enclosed by the sealing part is greater than a preset pressure.

15. An electrical device, comprising: The battery device includes any one of claims 1 to 14, the battery device being used to provide electrical energy.

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