Battery device and electric equipment

Abstract

The embodiment of the utility model discloses a battery device and electric equipment. The battery device includes: a battery cell including a housing and an electrode assembly, a first wall of the housing and the electrode assembly being disposed opposite to each other in a first direction; the first wall comprises a groove structure and a connecting area, the groove structure is recessed towards the interior of the battery cell relative to the connecting area along a first direction, and the surface, facing the interior of the battery cell, of the groove structure protrudes out of the surface, facing the interior of the battery cell, of the connecting area; the battery monomer further comprises a pressure relief mechanism arranged in the connecting area; the isolation part is located on the side, away from the interior of the battery monomer, of the first wall in the first direction, a first protruding structure protruding towards the groove structure is arranged on the side, facing the first wall, of the isolation part, and at least part of the first protruding structure is contained in the groove structure. According to the battery device and the electric equipment provided by the embodiment of the invention, the pressure relief efficiency of the battery monomers can be improved, and the reliability of the battery device is further improved.

Description

Battery devices and electrical equipment Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery device and an electrical appliance. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, in addition to improving battery performance, safety is also an issue that cannot be ignored. High-energy-density battery cells typically exhibit rapid gas production rates and high runaway temperatures when experiencing thermal runaway. How to design battery devices to improve the pressure relief efficiency of thermally runaway battery cells is a technical problem that urgently needs to be solved in battery technology. Summary of the Invention

[0004] This application provides a battery device and an electrical appliance that can improve the pressure relief efficiency of individual battery cells, thereby improving the reliability of the battery device.

[0005] In a first aspect, a battery device is provided, comprising: a battery cell including a housing and an electrode assembly housed within the housing, the housing including a first wall disposed opposite to the electrode assembly along a first direction; the first wall including a groove structure and a connection region, the groove structure being recessed toward the interior of the battery cell relative to the connection region along the first direction, and the surface of the groove structure toward the interior of the battery cell protruding beyond the surface of the connection region toward the interior of the battery cell; the battery cell further including a pressure relief mechanism disposed in the connection region; and an isolation member located on a side of the first wall away from the interior of the battery cell along the first direction, the side of the isolation member toward the first wall having a first protrusion structure protruding toward the groove structure, at least a portion of the first protrusion structure being housed within the groove structure.

[0006] Therefore, the battery device of this application embodiment, by providing a groove structure protruding towards the interior of the battery cell on the first wall of the battery cell, allows for a gap between the internal electrode assembly of the battery cell and the pressure relief mechanism provided on the first wall. In the event of thermal runaway of the battery cell, this groove structure can maintain the gap between the electrode assembly and the pressure relief mechanism in the first direction, making it less likely for the electrode assembly to block the exhaust path of the gas inside the battery cell when it is discharged through the pressure relief mechanism. This facilitates the discharge of internal emissions from the battery cell to the outside of the battery cell through the actuated pressure relief mechanism, improving the pressure relief efficiency of the battery cell and enabling directional pressure relief of the battery cell, thereby improving the reliability of the battery device. In addition, by providing a first protrusion structure of the isolation component that is at least partially accommodated within the groove structure, compared to a scheme where the first wall of the battery cell does not have this groove structure, the risk of the connection interface between the battery cell and the isolation component being peeled off due to deformation of the battery cell's outer shell caused by poor pressure relief is reduced. The risk of relative displacement between the battery cell and the isolation component leading to emission leakage and impact on adjacent battery cells, causing thermal diffusion, is also reduced. This facilitates directional discharge of emissions from the battery cell and further improves the reliability of the battery device.

[0007] In some embodiments, the housing further includes a plurality of sidewalls connected to the edge of the first wall and surrounding the electrode assembly; the groove structure is spaced apart from at least one of the sidewalls. On the one hand, the spaced-apart arrangement of the groove structure with respect to at least one of the sidewalls helps maintain the regularity of the sidewalls spaced apart from the groove structure and reduces the manufacturing difficulty of the sidewalls; on the other hand, the spaced-apart arrangement of the groove structure with respect to at least one of the sidewalls allows for a gap between the portion of the groove structure protruding towards the inside of the battery cell and the sidewall. This gap can form an exhaust path for gas to reach the pressure relief mechanism, so that when the battery cell experiences thermal runaway, the gas generated between the electrode assembly and different sidewalls can reach the pressure relief mechanism and be discharged from the battery cell through the corresponding gap.

[0008] In some embodiments, each corner of the first wall is provided with the groove structure. In the event of thermal runaway in a battery cell, the gas generated inside can pass through the gap between the groove structure at the corner and the sidewall to reach the pressure relief mechanism, and then be discharged from the battery cell through the pressure relief mechanism, thereby improving pressure relief efficiency. Furthermore, when the groove structure is located at the corner, its position is more dispersed, which can better support the internal electrode assembly.

[0009] In some embodiments, the first wall is provided with a plurality of groove structures, and the pressure relief mechanism is located between the plurality of groove structures along the length direction of the first wall, which facilitates the design and processing of the groove structures. Furthermore, the groove structures on both sides of the pressure relief mechanism along the length direction of the first wall can better support the internal electrode assembly, so that the internal electrode assembly is more balanced and stable.

[0010] In some embodiments, the outer surface of the first wall facing the battery cell is rectangular, and the first wall is provided with four groove structures. The pressure relief mechanism has two groove structures on each side along the length of the first wall. Providing four groove structures not only improves the support for the internal electrode assembly but also maximizes the gap between the multiple groove structures and the wall of the battery cell. This allows internal gas to reach the pressure relief mechanism and be smoothly discharged during thermal runaway of the battery cell, thus improving pressure relief efficiency.

[0011] In some embodiments, the groove structure satisfies at least one of the following conditions: along the length direction of the first wall, the minimum distance between the groove structure and the pressure relief mechanism is greater than or equal to 8 mm; along the length direction of the first wall, the ratio of the length of the groove structure to the length of the pressure relief mechanism is greater than or equal to 1 / 7 and less than or equal to 1 / 2; along the width direction of the first wall, the ratio of the width of the groove structure to the width of the pressure relief mechanism is greater than or equal to 1 / 4 and less than or equal to 1 / 3; along the length direction of the first wall, the length of the groove structure and the length of the first protrusion structure are greater than or equal to 0.2 mm and less than or equal to 1 mm; along the width direction of the first wall, the difference between the width of the groove structure and the width of the first protrusion structure is greater than or equal to 0.2 mm and less than or equal to 1 mm; the difference between the recess depth of the groove structure and the protrusion height of the first protrusion structure is greater than or equal to 0.4 mm and less than or equal to 1.2 mm; the recess depth of the groove structure is greater than or equal to 0.8 mm and less than or equal to 2 mm. By rationally setting the dimensions of the groove structure, the stability of its support electrode assembly can be improved, its obstruction of the path of gas emission from inside the battery cell to the pressure relief mechanism can be reduced, and the installation between the groove structure and the first protrusion structure can be facilitated.

[0012] In some embodiments, the isolation component is provided with a flow channel, and the first protrusion structure is disposed on the sidewall of the flow channel facing the first wall; the flow channel contains a heat exchange medium to regulate the temperature of the battery cell. This allows the flow channel to not overlap with the pressure relief area or discharge channel, and can also reduce the temperature of the first protrusion structure, which is at least partially housed within the groove structure of the battery cell, and further reduce the temperature of the battery cell.

[0013] In some embodiments, the first protruding structure protrudes along the first direction away from the flow channel to form a first receiving space closed relative to the flow channel together with the isolation member; the first receiving space contains a heat exchange medium to regulate the temperature of the battery cell; or, the first protruding structure forms a first receiving space communicating with the flow channel, and the first receiving space contains a heat exchange medium to regulate the temperature of the battery cell. Because the first wall of the battery cell has a recessed groove structure, compared to making the first protruding structure a solid structure, the first protruding structure has a first receiving space inside, which allows the first protruding structure to accommodate the heat exchange medium. This allows the temperature of the battery cell to be regulated through the first protruding structure, improving thermal management efficiency.

[0014] In some embodiments, the side of the isolation component away from the first wall is provided with a second protrusion protruding in a direction away from the first wall. Since the side of the isolation component away from the first wall can be used to collect emissions from the battery cells, the second protrusion can support the space in that area. For example, the second protrusion can abut against the casing wall of the housing facing the isolation component to increase the overall structural strength of the battery device, especially strengthening the bottom ball protection function of the casing wall to maintain sufficient space between the isolation component and the corresponding casing wall. When emissions are collected through this space, the collection efficiency can be improved.

[0015] In some embodiments, the isolation member is provided with a flow channel, the first protrusion structure is disposed on the side wall of the flow channel facing the first wall, and the second protrusion structure is disposed on the side wall of the flow channel away from the first wall; protruding along the first direction away from the flow channel, to form a second receiving space closed relative to the flow channel together with the isolation member, the second receiving space containing a heat exchange medium to regulate the temperature of the battery device; or, the second protrusion structure forms a second receiving space communicating with the flow channel, the second receiving space containing a heat exchange medium to regulate the temperature of the battery cell. Compared to the embodiment where the second protrusion structure is a solid structure, the hollow second protrusion structure has a second receiving space inside, which can accommodate a heat exchange medium. The temperature of the battery cell can be regulated by the second protrusion structure, and the temperature of the emissions in the collection chamber can also be regulated by the second protrusion structure when high-temperature emissions enter the collection chamber, thereby improving the thermal management efficiency of the battery device.

[0016] In some embodiments, the battery device further includes: a housing comprising an electrical cavity and a collection cavity, the electrical cavity for accommodating a plurality of battery cells; an isolation component for isolating the electrical cavity and the collection cavity; the isolation component including a pressure relief area corresponding to the pressure relief mechanism; the pressure relief area having a pressure relief orifice at least partially opposite to the pressure relief mechanism; or the pressure relief area being configured to break under the action of emissions discharged by the pressure relief mechanism. By using an isolation component to isolate the electrical cavity and the collection cavity, the electrical cavity accommodating the battery cells and the collection cavity collecting emissions are spatially separated. In the event of thermal runaway of a battery cell, emissions discharged through the pressure relief mechanism can enter the collection cavity through the pressure relief area, and the collection cavity can collect the emissions, reducing the risk of at least some emissions entering the electrical cavity from the collection cavity and lowering the risk of thermal diffusion.

[0017] In some embodiments, the isolation component has an internal discharge channel, and a pressure relief area is disposed on the side wall of the discharge channel facing the first wall. The discharge channel communicates with the collection chamber, allowing the emissions to pass through the pressure relief area into the discharge channel and be discharged into the collection chamber. In the event of thermal runaway of a battery cell, the emissions discharged by the pressure relief mechanism of the battery cell enter the discharge channel through the pressure relief area. The discharge channel communicates with the collection chamber, allowing the emissions in the discharge channel to enter the collection chamber, thereby achieving directional discharge of the emissions.

[0018] In some embodiments, the battery device includes a plurality of battery cells arranged along a first direction, and a discharge channel extending along the first direction. The discharge channel includes a plurality of pressure relief regions, each corresponding one-to-one with a pressure relief mechanism of one of the battery cells. This ensures that each battery cell has a corresponding pressure relief region, so that in the event of thermal runaway in any battery cell, the emissions emitted by that battery cell can be discharged into the discharge channel through its corresponding pressure relief region, reducing the impact of the emissions on adjacent battery cells.

[0019] In some embodiments, the isolation member supports the battery cell along a first direction. Thus, with the isolation member located below the battery cell, the collection chamber is also located below the battery cell, facilitating faster discharge of emissions from the battery cell under gravity and faster entry into the collection chamber, thereby improving pressure relief efficiency and further enhancing the reliability of the battery device.

[0020] In some embodiments, a thermally conductive insulating layer is provided on the surface of the first protrusion structure facing the groove structure. This layer can both transfer heat from the battery cell to regulate its temperature and improve the insulation performance between the groove structure and the first protrusion structure.

[0021] In a second aspect, an electrical device is provided, comprising: the battery device described in the first aspect or any embodiment of the first aspect.

[0022] In some embodiments, the electrical equipment is a vehicle, a ship, or a spacecraft. Attached Figure Description

[0023] Figure 1 is a schematic diagram of a vehicle according to an embodiment of this application;

[0024] Figure 2 is an exploded view of a portion of the structure of a battery device according to an embodiment of this application;

[0025] Figure 3 is a top view of a single battery cell according to an embodiment of this application;

[0026] Figure 4 is a cross-sectional schematic diagram of a battery cell according to an embodiment of this application;

[0027] Figure 5 is a cross-sectional schematic diagram of a battery device according to an embodiment of this application;

[0028] Figure 6 is a schematic diagram of the structure of an isolation component according to an embodiment of this application;

[0029] Figure 7 is a schematic diagram of the structure of multiple battery cells and isolation components according to an embodiment of this application;

[0030] Figure 8 is a bottom view of multiple battery cells according to an embodiment of this application;

[0031] Figure 9 is a bottom view of multiple battery cells according to another embodiment of this application;

[0032] Figure 10 is a bottom view of multiple battery cells according to another embodiment of this application;

[0033] Figure 11 is a bottom view of multiple battery cells according to another embodiment of this application;

[0034] Figure 12 is a top view of an isolation component according to an embodiment of this application;

[0035] Figure 13 is a top view of a plurality of battery cells and isolation components according to an embodiment of this application;

[0036] Figure 14 is a cross-sectional schematic diagram of multiple battery cells and isolation components according to an embodiment of this application;

[0037] Figure 15 is another cross-sectional view of a battery cell according to an embodiment of this application;

[0038] Figure 16 is a cross-sectional schematic diagram of an isolation component according to an embodiment of this application;

[0039] Figure 17 is a schematic diagram of the structure of multiple battery cells and isolation components according to another embodiment of this application;

[0040] Figure 18 is a cross-sectional schematic diagram of multiple battery cells and isolation components according to another embodiment of this application;

[0041] Figure 19 is a cross-sectional schematic diagram of multiple battery cells and isolation components according to another embodiment of this application.

[0042] The accompanying drawings are not drawn to scale.

[0043] Figure label:

[0044] 1-Vehicle; 100-Battery unit; 10-Box; 11-Electrical cavity; 12-Collection cavity; 13-First box section; 131-First part; 132-Second part; 14-Second box section; 20-Battery cell; 21-First wall; 211-Groove structure; 212-Pressure relief mechanism; 213-Connection area; 22-Outer shell; 221-Side wall; 23-Electrode terminal; 24-Electrode assembly; 30-Isolation component; 31-First protrusion structure; 311-First receiving space; 32-Pressure relief area; 33-Emission channel; 34-Second protrusion structure; 341-Second receiving space; 35-Flow channel; 200-Controller; 300 Motor. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0047] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0050] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0051] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0052] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0053] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0054] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0055] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0056] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0057] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0058] 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.

[0059] 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.

[0060] High-energy-density battery cells are characterized by "rapid gas production rate and high runaway temperature" when they experience thermal runaway. Therefore, in order to improve the efficiency of pressure relief during thermal runaway, a large-area pressure relief mechanism is often configured at the bottom of the battery cell. However, under thermal runaway conditions, due to the excessively large area of ​​the pressure relief mechanism at the bottom of the battery cell, the support of the bottom pad inside the battery cell is insufficient. When the battery cell is depressurized, the internal electrode assembly will press down and block the exhaust path, causing the battery cell to be unable to depressurize in time through the pressure relief mechanism. This can lead to the failure of the welds of the battery cell's cover plate and shell, or thermal diffusion.

[0061] Therefore, the battery device and electrical appliance of the present application embodiments can solve the above-mentioned problems. The battery device of the present application embodiments includes a battery cell and an insulating component. The battery cell includes a housing and an electrode assembly, the electrode assembly being housed within the housing. The housing includes a first wall, which is disposed opposite to the electrode assembly along a first direction. The first wall includes a groove structure and a connecting region. The groove structure is recessed towards the interior of the battery cell relative to the connecting region along the first direction, and the surface of the groove structure facing the interior of the battery cell protrudes beyond the surface of the connecting region facing the interior of the battery cell. The battery cell also includes a pressure relief mechanism disposed in the connecting region. The insulating component is located on the side of the first wall away from the interior of the battery cell along the first direction. The side of the insulating component facing the first wall has a first protrusion structure protruding towards the groove structure, at least partially accommodated within the groove structure.

[0062] By providing a groove structure protruding inwards from the first wall of the battery cell, a gap can be created between the internal electrode assembly and the pressure relief mechanism on the first wall. In the event of thermal runaway, the battery cell's outer shell is relatively strong, and the groove structure on the first wall is less prone to deformation. This groove structure maintains the gap between the electrode assembly and the pressure relief mechanism along the first direction, preventing the electrode assembly from blocking the exhaust path of gas from the battery cell as it is discharged through the pressure relief mechanism. This facilitates the discharge of internal emissions from the battery cell to the outside through the activated pressure relief mechanism, improving the pressure relief efficiency of the battery cell and enabling directional pressure relief, thereby enhancing the reliability of the battery device.

[0063] Furthermore, battery cells often use high-temperature resistant casings, such as steel or titanium casings. When a battery cell experiences thermal runaway, the high internal pressure can easily lead to deformation during this process. By incorporating a first protrusion structure of the isolation component, which is at least partially accommodated within a groove structure, the interaction between the protrusion and groove provides a limiting effect. Compared to a design without this groove structure, where the first wall of the battery cell is relatively flat, this reduces the risk of the battery cell deforming due to poor pressure relief, leading to delamination of the connection interface between the battery cell and the isolation component. It also reduces the risk of relative displacement between the battery cell and the isolation component causing leakage of emissions and impacting adjacent battery cells, thus triggering thermal diffusion. This facilitates directional emission of emissions from the battery cell and further improves the reliability of the battery device.

[0064] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0065] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0066] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0067] For example, as shown in Figure 1, which is a structural schematic diagram of a vehicle 1 according to one embodiment of this application, vehicle 1 can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 300, a controller 200, and a battery device 100 can be installed inside vehicle 1. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed at the bottom, front, or rear of vehicle 1. The battery device 100 can be used to power vehicle 1. For example, the battery device 100 can serve as the operating power source for vehicle 1, for example, for the electrical system of vehicle 1, such as for the power requirements of vehicle 1's starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0068] Figure 2 shows an exploded view of a portion of the structure of a battery device 100 according to an embodiment of this application. As shown in Figure 2, the battery device 100 according to this application includes a battery cell 20 and an isolation component 30. Figure 3 shows a top view of the battery cell 20 according to an embodiment of this application. For example, Figure 3 can be a top view of any one of the battery cells 20 included in the battery device 100 shown in Figure 2. Figure 4 shows a cross-sectional view of the battery cell 20 according to an embodiment of this application. For example, Figure 4 can be a cross-sectional view of the battery cell 20 along direction A-A' as shown in Figure 3.

[0069] In this embodiment, the battery cell 20 includes a housing 22 and an electrode assembly 24. The electrode assembly 24 is housed within the housing 22. The housing 22 includes a first wall 21, which is disposed opposite to the electrode assembly 24 along a first direction. The first wall 21 includes a groove structure 211 and a connecting region 213. The groove structure 211 is recessed toward the interior of the battery cell 20 relative to the connecting region 213 along the first direction, and the surface of the groove structure 211 toward the interior of the battery cell 20 protrudes beyond the surface of the connecting region 213 toward the interior of the battery cell 20. The battery cell 20 also includes a pressure relief mechanism 212 disposed in the connecting region 213. An isolation member 30 is located on the side of the first wall 21 away from the interior of the battery cell 20 along the first direction. The side of the isolation member 30 toward the first wall 21 is provided with a first protrusion structure 31 protruding toward the groove structure 211, and at least a portion of the first protrusion structure 31 is housed within the groove structure 211.

[0070] The battery device 100 of this application embodiment may include at least one battery cell 20 for providing voltage and capacity. For example, the battery device 100 may include at least one battery cell assembly, wherein each battery cell assembly may include at least one battery cell 20. Exemplarily, when the battery device 100 includes multiple battery cells 20, the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection.

[0071] The battery cell 20 in this embodiment has a polyhedral structure. As an example, the battery cell 20 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 impose any particular limitation. Correspondingly, the battery cell 20 can include a shell 22, which includes multiple walls. The first wall 21 can be any one of the walls of the shell 22 of the battery cell 20. For example, the shell 22 of the battery cell 20 can be a hollow structure, and the first wall 21 can be any one of the walls of the shell 22.

[0072] In some embodiments, the housing 22 can be a steel housing, an aluminum housing, a plastic housing (such as a polypropylene housing), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc. In some embodiments, the housing 22 can be a sealed structure or a non-sealed structure. As an example, when the housing 22 is a sealed structure, it is used to encapsulate components such as electrode assemblies and electrolytes.

[0073] In some embodiments, the outer casing 22 may include an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. One or more end caps may also be provided to respectively cover each opening of the housing. The first wall 21 may be an end cap, or it may be any wall of the housing; the embodiments of this application are not limited thereto.

[0074] For ease of explanation, as shown in Figures 2 to 4, this embodiment of the application takes a cuboid battery cell 20 as an example, and defines three directions based on the cuboid battery cell 20: the length direction X of the battery cell 20, the thickness direction Y of the battery cell 20, and the height direction Z of the battery cell 20. The length direction X, the thickness direction Y, and the height direction Z are perpendicular to each other, and the dimension of the battery cell 20 in its length direction X is greater than the dimension in its thickness direction Y.

[0075] The battery cell 20 in this embodiment further includes an electrode assembly 24, which is housed within the outer casing 22 and is disposed opposite to the first wall 21 along a first direction, i.e., the first wall 21 and the electrode assembly 24 are arranged along the first direction, and the first direction is the thickness direction of the first wall 21. For example, as shown in Figures 2 to 4, this embodiment describes the first wall 21 as the bottom wall in the height direction Z of the battery cell 20, where the first direction is the height direction Z of the battery cell 20. However, this embodiment is not limited to this.

[0076] It should be understood that the electrode assembly 24 in this embodiment typically includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions or sodium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0077] The electrode assembly 24 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0078] In some embodiments, the electrode assembly 24 is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0079] In some embodiments, the electrode assembly 24 is a stacked structure.

[0080] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0081] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0082] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0083] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0084] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0085] In some embodiments, the electrode assembly 24 may be cylindrical, flat, or polygonal in shape.

[0086] In some embodiments, the electrode assembly 24 is provided with tabs that can conduct current from the electrode assembly 24. The tabs include a positive tab and a negative tab.

[0087] In this embodiment of the application, the first wall 21 of the battery cell 20 is provided with a pressure relief mechanism 212, which is used to discharge the internal gas of the battery cell 20. As an example, the first wall 21 of this embodiment of the application includes a groove structure 211 and a connecting region 213, and the pressure relief mechanism 212 can be disposed in the connecting region 213.

[0088] The pressure relief mechanism 212 of this embodiment is actuated to release internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism 212 performs an action or a weak structure provided in the pressure relief mechanism 212 is destroyed, thereby forming an opening or channel for releasing internal pressure or temperature. The threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 20.

[0089] As an example, the pressure relief mechanism 212 can be integrally formed with the first wall 21 of the housing 22, or the pressure relief mechanism 212 can be separately set and connected to the first wall 21.

[0090] The term "actuation" as used in this application refers to the pressure relief mechanism 212 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The actions of the pressure relief mechanism 212 may include, but are not limited to: movement of components within the pressure relief mechanism 212 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 212, etc. When the pressure relief mechanism 212 is actuated, the high-temperature, high-pressure substances inside the battery cell 20 are discharged outwards from the actuated portion as waste. This method allows for pressure and temperature relief of the battery cell 20 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0091] The emissions from the battery cell 20 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0092] As shown in Figures 2 to 4, the first wall 21 of the battery cell 20 in this embodiment includes a groove structure 211 and a connecting region 213, wherein the connecting region 213 is at least a portion of the region of the first wall 21 excluding the groove structure 211. The surface of the groove structure 211 facing the interior of the battery cell 20 protrudes beyond the surface of the connecting region 213 facing the interior of the battery cell 20. This allows the protruding groove structure 211 to support the electrode assembly 24 inside the battery cell 20, creating a gap between the electrode assembly 24 and the pressure relief mechanism 212 disposed on the first wall 21 along a first direction. In the event of thermal runaway in the battery cell 20, considering that the outer shell 22 of the battery cell 20 is generally strong, the groove structure 211 provided on the first wall 21 is not easily deformed. Therefore, the groove structure 211 can maintain the gap between the electrode assembly 24 and the pressure relief mechanism 212 along the first direction. The gas generated inside the battery cell 20 can reach the pressure relief mechanism 212 through the gap, forming an exhaust path inside the battery cell 20. This ensures that the electrode assembly 24 is not easily blocked from the exhaust path of the gas inside the battery cell 20 when it is discharged through the pressure relief mechanism 212. It also makes it easier for the emissions inside the battery cell 20 to be discharged to the outside of the battery cell 20 in a timely manner through the actuated pressure relief mechanism 212, thereby improving the pressure relief efficiency of the battery cell 20 and reducing the risk of failure caused by the weld between the cover plate and the shell of the battery cell 20 due to the gas inside the battery cell 20. It also makes it easier to achieve directional pressure relief of the emissions from the battery cell 20 through the pressure relief mechanism 212, thereby improving the reliability of the battery device 100.

[0093] Furthermore, the groove structure 211 of the first wall 21 is recessed towards the interior of the battery cell 20 along the first direction relative to the connecting area. Correspondingly, the isolation component 30 disposed on the side of the first wall 21 away from the interior of the battery cell 20 has a first protrusion structure 31. The first protrusion structure 31 is located on the side of the isolation component 30 facing the first wall 21 and protrudes towards the groove structure 211 of the first wall 21, such that at least a portion of the first protrusion structure 31 is accommodated within the groove structure 211. This allows the battery cell 20 and the isolation component 30 to be positioned relative to each other through the mutual cooperation between the first protrusion structure 31 and the groove structure 211, thereby limiting the relative movement between the battery cell 20 and the isolation component 30. Considering that the battery cell 20 uses a high-temperature resistant outer shell 22, such as a steel shell or a titanium shell, the internal pressure of the battery cell 20 is high during thermal runaway, which can easily lead to deformation of the battery cell 20 during thermal runaway. By providing the first protrusion structure 31 of the isolation component 30 to be at least partially accommodated within the groove structure 211, the risk of relative displacement between the battery cell 20 and the isolation component 30 can be reduced. For example, if the battery cell 20 and the isolation component 30 are not provided with a mutually cooperating groove structure 211 and first protrusion structure 31, for instance, if the relatively flat first wall 21 of the battery cell 20 and the isolation component 30 can be fixed together by means of adhesive, then when the battery cell 20 experiences thermal runaway, the battery cell 20 will deform its outer casing 22 due to poor pressure relief, which will cause the connection interface between the battery cell 20 and the isolation component 30 to peel off, resulting in displacement of the battery cell 20 relative to the isolation component 30. Therefore, by having the first protrusion structure 31 at least partially accommodated within the groove structure 211, the position between the battery cell 20 and the isolation component 30 can be restricted, which can reduce the risk of leakage of emissions due to relative displacement of the battery cell 20 relative to the isolation component 30 and impact of adjacent battery cells 20, thereby causing heat diffusion. This facilitates the directional emission of emissions from the battery cell 20 and further improves the reliability of the battery device 100.

[0094] In some embodiments, the battery cell 20 further includes at least one electrode terminal 23, which is electrically connected to the tab of the internal electrode assembly 24. The electrode terminal 23 may be directly connected to the tab or indirectly connected to the tab through a current collector.

[0095] In this embodiment, all electrode terminals 23 of the battery cell 20 can be located on any one or more walls of the battery cell 20, that is, different electrode terminals 23 can be located on the same wall or different walls of the battery cell 20. For example, as shown in Figures 2 to 4, this embodiment mainly takes a battery cell 20 with two electrode terminals 23 as an example, and both electrode terminals 23 are located on the same wall of the battery cell 20. Here, we take the example that both electrode terminals 23 are located on any wall different from the first wall 21, but this embodiment is not limited to this.

[0096] When the pressure relief mechanism 212 and the electrode terminal 23 are not located on the same wall, the emissions discharged through the pressure relief mechanism 212 will have less impact on the electrode terminal 23 in the event of thermal runaway of the battery cell 20. In particular, the emissions usually include conductive particles. By not placing the pressure relief mechanism 212 and the electrode terminal 23 on the same wall, the risk of short circuit of the electrode terminal 23 caused by conductive particles in the emissions can be reduced, thereby improving the reliability of the battery device 100.

[0097] It should be understood that the specific implementation of the isolation component 30 in the embodiments of this application can be set according to actual applications. Figure 5 shows a cross-sectional schematic diagram of the battery device 100 according to an embodiment of this application. For example, Figure 5 can be a cross-sectional schematic diagram of the battery device 100 as shown in Figure 2, with the cross-section perpendicular to the thickness direction Y of the battery cell 20.

[0098] In some embodiments, the battery device 100 further includes a housing 10, which includes an electrical cavity 11 and a collection cavity 12. The electrical cavity 11 is used to accommodate a plurality of battery cells 20. An isolation component 30 is used to isolate the electrical cavity 11 and the collection cavity 12. The isolation component 30 includes a pressure relief area 32 corresponding to the pressure relief mechanism 212. In this way, emissions from the battery cells 20 discharged through the pressure relief mechanism 212 can pass through the pressure relief area 32 of the isolation component 30 and then be discharged into the collection cavity 12, which is used to collect the emissions.

[0099] It should be understood that, as shown in FIG5, the electrical cavity 11 of this application embodiment can be used to accommodate battery cells 20, and there is no limitation on the number of battery cells 20 accommodated. In addition, the electrical cavity 11 may also be provided with structures for fixing the battery cells 20 and / or other electrical components electrically connected to the battery cells 20.

[0100] In some embodiments, the shape of the electrical cavity 11 can be determined according to the battery cell 20 it accommodates. For example, in the embodiments of this application, the electrical cavity 11 is mainly a hollow cuboid, formed by being enclosed by at least six walls to facilitate processing.

[0101] It should be understood that, as shown in FIG. 5, the collection chamber 12 of this embodiment is used to collect emissions from the battery cell 20. Specifically, the collection chamber 12 may contain air or other gases. Alternatively, the collection chamber 12 may contain liquid, such as a cooling medium, or a component for containing the liquid may be provided to further cool the emissions entering the collection chamber 12. Furthermore, the gas or liquid in the collection chamber 12 may be circulated.

[0102] It should be understood that the electrical cavity 11 in the embodiments of this application may be sealed or unsealed; similarly, the collection cavity 12 in the embodiments of this application may also be sealed or unsealed, and this application does not limit this.

[0103] It should be understood that, as shown in FIG5, the isolation component 30 in this embodiment of the application is used to isolate the electrical cavity 11 and the collection cavity 12. The term "isolation" here refers to separation, which can be sealed or unsealed. Specifically, by using the isolation component 30 to isolate the electrical cavity 11 and the collection cavity 12, the electrical cavity 11 for accommodating the battery cell 20 and the collection cavity 12 for collecting emissions are spatially separated from each other. This can reduce the risk of at least some emissions entering the electrical cavity 11 from the collection cavity 12, thereby reducing the risk of heat diffusion.

[0104] In some embodiments, the isolation component 30 may include a wall shared by the electrical cavity 11 and the collection cavity 12. As shown in FIG5, all or part of the isolation component 30 may be directly used as a wall shared by the electrical cavity 11 and the collection cavity 12, thereby minimizing the distance between the electrical cavity 11 and the collection cavity 12, saving space, and improving the space utilization of the housing 10.

[0105] It should be understood that the electrical cavity 11 and the collection cavity 12 of the housing 10 in this application embodiment can be implemented in various ways, and this application embodiment does not limit them. For example, for the electrical cavity 11, the housing 10 may include a first housing portion 13 with an opening, and an isolation member 30 covers the opening of the first housing portion 13 to form the electrical cavity 11. In this way, the wall for forming the electrical cavity 11 includes the first housing portion 13 and the isolation member 30. The first housing portion 13 can also be implemented in various ways. For example, the first housing portion 13 can be a hollow integral structure with an opening at one end; or, as shown in FIG2, the first housing portion 13 can also include a first part 131 and a second part 132 with openings on opposite sides, the first part 131 covering one side opening of the second part 132 to form a first housing portion 13 with an opening at one end, and the isolation member 30 covering the other side opening of the second part 132 to form the electrical cavity 11. The isolation component 30 and the second part 132 can be an integrally formed structure, or the isolation component 30 and the second part 132 can be fixed by welding or connecting parts. For example, the isolation component 30 and the second part 132 can also be fixed by bolts. The embodiments of this application are not limited to this.

[0106] As shown in Figures 2 and 5, the corresponding collection chamber 12 is further provided by the housing 10 including a second housing portion 14, which forms the collection chamber 12 with the isolation component 30. Additionally, the second housing portion 14 can also protect the isolation component 30; that is, the wall of the collection chamber 12 includes the second housing portion 14 and the isolation component 30.

[0107] For example, unlike the above implementation, the housing 10 may also include a closed cover, which can be used to form an electrical cavity 11. Alternatively, by placing an isolation member 30 inside the cover, the electrical cavity 11 can be isolated from the inside of the cover. Furthermore, a collection cavity 12 can also be isolated. The cover can also be implemented in various ways. For example, the cover may include a third part and a fourth part, with one side of the fourth part having an opening to form a semi-closed structure. The isolation member 30 is disposed inside the fourth part, and the third part covers the opening of the fourth part, thereby forming a closed cover.

[0108] The isolation component 30 in this embodiment includes a pressure relief region 32 corresponding to the pressure relief mechanism 212. Thus, in the event of thermal runaway of the battery cell 20, the emissions discharged from the battery cell 20 through the pressure relief mechanism 212 can pass through the pressure relief region 32 into the collection chamber 12, facilitating the collection chamber 12 to collect and further process the emissions. For example, the collection chamber 12 may be equipped with a pressure relief valve to discharge the emissions from the collection chamber 12.

[0109] It should be understood that the specific manner in which the isolation component 30 of this application discharges the emissions through the pressure relief zone 32 to the collection chamber 12 can be configured according to actual applications. Figure 6 shows a schematic diagram of the structure of the isolation component 30 of this application embodiment. For example, the isolation component 30 can be the isolation component 30 included in the battery device 100 shown in Figure 2.

[0110] In some embodiments, the isolation component 30 has a discharge channel 33 inside, and a pressure relief area 32 is disposed on the side wall of the discharge channel 33 facing the first wall 21. The discharge channel 33 communicates with the collection chamber 12 so that the discharge material passes through the pressure relief area 32 into the discharge channel 33 and is discharged into the collection chamber 12. In the event of thermal runaway of the battery cell 20, the discharge material discharged by the pressure relief mechanism 212 of the battery cell 20 enters the discharge channel 33 through the pressure relief area 32. The discharge channel 33 communicates with the collection chamber 12 so that the discharge material in the discharge channel 33 enters the collection chamber 12, thereby achieving directional discharge of the discharge material.

[0111] In some embodiments, the communication between the discharge channel 33 and the collection chamber 12 includes: at least one of the openings at the two ends of the discharge channel 33 that are disposed opposite each other in its extending direction communicating with the collection chamber 12, for example, as shown in FIG6; or, an opening may be provided at a specific location of the discharge channel 33 so that the opening communicates with the collection chamber 12, and the embodiments of this application are not limited thereto.

[0112] It should be understood that the number of emission channels 33 and pressure relief zones 32 in the embodiments of this application can be set according to actual applications.

[0113] In some embodiments, the battery device 100 includes a plurality of battery cells 20 arranged along a first direction, and an emission channel 33 extends along the first direction so that the emissions of the plurality of battery cells 20 arranged in the first direction are all discharged through the same emission channel 33, thereby improving emission efficiency.

[0114] For example, as shown in FIG6, taking the thickness direction Y of the battery cell 20 as an example, the battery device 100 may include at least one row of battery cells 20 arranged along the length direction X of the battery cells 20, and each row of battery cells 20 includes a plurality of battery cells 20 arranged along the thickness direction Y of the battery cells 20. Correspondingly, the isolation component 30 includes at least one discharge channel 33 arranged along the thickness direction Y of the battery cells 20, and each discharge channel 33 collects a plurality of battery cells 20 arranged along the thickness direction Y of the battery cells 20.

[0115] In some embodiments, each discharge channel 33 may be provided with at least one pressure relief zone 32, and each pressure relief zone 32 corresponds to at least one pressure relief mechanism of a battery cell 20.

[0116] For example, as shown in Figure 6, the discharge channel 33 includes multiple pressure relief zones 32, which correspond one-to-one with the pressure relief mechanisms 212 of multiple battery cells 20, so that each battery cell 20 has a corresponding pressure relief zone 32. When any battery cell 20 experiences thermal runaway, the emissions emitted by that battery cell 20 can be discharged into the discharge channel 33 through its corresponding pressure relief zone 32, reducing the impact of the emissions on adjacent battery cells 20.

[0117] For example, unlike the one shown in Figure 6, the discharge channel 33 may also include at least one pressure relief zone 32, each pressure relief zone 32 corresponding to the pressure relief mechanism 212 of multiple battery cells 20, so as to reduce the number of pressure relief zones 32 and simplify the processing.

[0118] It should be understood that, unlike the isolation component 30 shown in FIG6, the isolation component 30 of this embodiment may not have a discharge channel 33. For example, in the event of thermal runaway of the battery cell 20, the pressure relief zone 32 may penetrate the isolation component 30 along the thickness direction, so that the emissions from the battery cell 20 are directly discharged to the collection chamber 12 below through the pressure relief zone 32.

[0119] It should be understood that the specific structure of the pressure relief zone 32 in this application embodiment can be set according to actual application to flexibly adapt to different application scenarios.

[0120] In some embodiments, the pressure relief zone 32 is provided with a pressure relief hole that is at least partially opposite to the pressure relief mechanism 212. For example, the pressure relief hole can be a through hole penetrating the sidewall of the discharge channel 33, so that when the battery cell 20 experiences thermal runaway, the emissions discharged through the pressure relief mechanism 212 can be directly discharged into the discharge channel 33 through the pressure relief hole that is at least partially opposite to the pressure relief mechanism 212; or, the pressure relief hole can also be a through hole penetrating the isolation member 30, so that when the battery cell 20 experiences thermal runaway, the emissions discharged through the pressure relief mechanism 212 can be directly discharged into the collection chamber 12 below through the pressure relief hole that is at least partially opposite to the pressure relief mechanism 212. Providing a pressure relief hole in the pressure relief zone 32 can increase the speed at which the emissions pass through the pressure relief zone 32, thereby improving the discharge efficiency.

[0121] In some embodiments, the pressure relief zone 32 is configured to break under the action of emissions emitted from the pressure relief mechanism 212. For example, when the pressure relief mechanism 212 is not activated, such as during normal use of the battery device 100, the isolation component 30 is in a relatively sealed state, effectively protecting the pressure relief mechanism 212 from damage and failure due to external forces. Furthermore, when the pressure relief mechanism 212 is activated, the pressure relief zone 32 is configured to break under the action of emissions emitted from the pressure relief mechanism 212. For example, the pressure relief zone 32 can be a weak area, with a strength lower than that of other areas in the isolation component 30 besides the pressure relief zone 32. Therefore, the pressure relief zone 32 can be easily broken by emissions, allowing emissions from the battery cell 20 equipped with the pressure relief mechanism 212 to pass through the weak area and exit the electrical cavity 11. For example, the pressure relief zone 32 can be a weak area located on the side wall of the discharge channel 33. In the event of thermal runaway of the battery cell 20, the emissions discharged through the pressure relief mechanism 212 can destroy the pressure relief zone 32. The emissions can then be discharged directly into the discharge channel 33 through the destroyed pressure relief zone 32, and further discharged into the collection chamber 12 through the discharge channel 33. Alternatively, the pressure relief zone 32 can also be a weak area located in the thickness direction of the isolation component 30. In the event of thermal runaway of the battery cell 20, the emissions discharged through the pressure relief mechanism 212 can destroy the pressure relief zone 32. The emissions can then be discharged directly into the collection chamber 12 below through the destroyed pressure relief zone 32.

[0122] It should be understood that the specific implementation of the weak area in the embodiments of this application can be set according to actual applications. For example, the weak area can be achieved by thinning the isolation component 30, that is, the thickness of the pressure relief area 32 of the isolation component 30 is less than the thickness of other areas of the isolation component 30 except for the pressure relief area 32. Alternatively, the weak area can be achieved by special materials such as temperature-sensitive materials, that is, the pressure relief area 32 of the isolation component 30 is made of temperature-sensitive materials so that it can be melted when the battery cell 20 experiences thermal runaway, thereby enabling the discharge of emissions. The embodiments of this application are not limited to this.

[0123] It should be understood that the first wall 21 in the embodiments of this application can be any wall of the battery cell 20, and correspondingly, the isolation component 30 can be located on the side of the battery cell 20 where the first wall 21 is provided.

[0124] In some embodiments, the isolation member 30 supports the battery cell 20 along a first direction, i.e., the first direction can be the direction of gravity. Therefore, along the direction of gravity, the first wall 21 is the bottom wall of the battery cell 20, and the isolation member 30 is located below the battery cell 20. In the event of thermal runaway in the battery cell 20, the electrode assembly 24 inside the battery cell 20 abuts against the protruding groove structure 211 under the influence of gravity. This reduces the risk of the electrode assembly 24 blocking the internal exhaust path of the battery cell 20, and facilitates the timely discharge of internal emissions from the battery cell 20 to the outside of the battery cell 20 via the actuated pressure relief mechanism 212. This improves the pressure relief efficiency of the battery cell 20 and facilitates directional pressure relief of emissions from the battery cell 20 via the pressure relief mechanism 212, thereby improving the reliability of the battery device 100. Furthermore, since the isolation component 30 is located below the battery cell 20, the collection chamber 12 is also located below the battery cell 20. This facilitates the faster discharge of the battery cell 20 under the influence of gravity, allowing it to enter the collection chamber 12 more quickly, thereby improving the pressure relief efficiency and further enhancing the reliability of the battery device 100.

[0125] The specific implementation of the groove structure 211 and the first protrusion structure 31 in the embodiments of this application will be described below with reference to the accompanying drawings.

[0126] Figure 7 shows a structural schematic diagram of multiple battery cells 20 and isolation components 30 according to an embodiment of this application. For example, Figure 7 can be a structural schematic diagram of multiple battery cells 20 and isolation components 30 included in the battery device 100 shown in Figure 2. Figure 8 shows a bottom view schematic diagram of multiple battery cells 20 according to an embodiment of this application. For example, Figure 8 can be a bottom view schematic diagram of multiple adjacent battery cells 20 as shown in Figure 7.

[0127] It should be understood that the groove structure 211 in this embodiment can be located at any position of the first wall 21 to suit different application scenarios.

[0128] In some embodiments, the housing 22 further includes a plurality of sidewalls 221 connected to the edge of the first wall 21 and surrounding the electrode assembly 24; the groove structure 211 is spaced apart from at least one of the plurality of sidewalls 221. As shown in Figures 7 and 8, taking the cuboid housing 22 as an example, the housing 22 includes four sidewalls 221 connected to the edge of the first wall 21 and surrounding the electrode assembly 24. In this embodiment, the groove structure 211 is spaced apart from at least one of the four sidewalls 221, that is, there is a gap between the portion of the groove structure 211 protruding toward the inside of the battery cell 20 and the sidewall 221. This gap can form an exhaust path for gas to reach the pressure relief mechanism 212, so that the gas generated when the battery cell 20 experiences thermal runaway can pass through the gap to reach the pressure relief mechanism 212 and be discharged from the battery cell 20.

[0129] For example, as shown in Figures 7 and 8, the battery cell 20 has two smaller sidewalls 221 arranged opposite each other along the length direction X of the battery cell 20. The intersection lines of these two sidewalls with the first wall 21 are the two opposite edges of the first wall 21 arranged opposite each other along the length direction X. For any groove structure 211, the groove structure 211 can be spaced apart from either of the two smaller sidewalls 221, so that there is a gap between the groove structure 211 and the sidewall 221. Then, when the battery cell 20 generates gas due to thermal runaway, the gas between the sidewall 221 perpendicular to the thickness direction Y of the battery cell 20 and the electrode assembly 24 can reach the pressure relief mechanism 212 through the gap. That is, the gap can be used to form an exhaust path for this part of the gas to reach the pressure relief mechanism 212, so that the gas can be discharged through the pressure relief mechanism 212 in a timely manner, thereby improving the pressure relief efficiency.

[0130] Similarly, as shown in Figures 7 and 8, the battery cell 20 has two large sidewalls 221 arranged opposite each other along the thickness direction Y. The intersection of these two sidewalls 221 with the first wall 21 is the two opposite edges of the first wall 21 arranged opposite each other along the thickness direction Y. For any groove structure 211, the groove structure 211 can be spaced apart from either of the two large sidewalls 221, so that there is a gap between the groove structure 211 and the sidewall 221. Then, when the battery cell 20 generates gas due to thermal runaway, the gas between the sidewall 221 perpendicular to the length direction X of the battery cell 20 and the electrode assembly 24 can reach the pressure relief mechanism 212 through the gap. That is, the gap can be used to form an exhaust path for this part of the gas to reach the pressure relief mechanism 212, so that the gas can be discharged in time through the pressure relief mechanism 212, thereby improving the pressure relief efficiency.

[0131] It should be understood that the specific location of the groove structure 211 provided on the first wall 21 can be set according to the actual application.

[0132] In some embodiments, each corner of the first wall 21 is provided with a groove structure 211. As shown in Figures 7 and 8, when the corner of the first wall 21 is provided with a groove structure 211, for any one of the groove structures 211 located at the corner: there is no gap between the groove structure 211 and the two side walls 221 used to form the corner, but there is a gap between it and the other side walls. For example, for two side walls 221 arranged opposite each other along the length direction X, the groove structure 211 at any corner has a gap between it and one of the side walls 221, but no gap between it and the other side wall 221; for two side walls 221 arranged opposite each other along the thickness direction Y, the groove structure 211 has a gap between it and one of the side walls 221, but no gap between it and the other side wall 221.

[0133] In this way, in the event of thermal runaway of the battery cell 20, the gas generated inside it can reach the pressure relief mechanism 212 through the gap between the corner groove structure 211 and the other side walls 221 of the first wall 21, and then be discharged from the battery cell 20 through the pressure relief mechanism 212, thereby improving the pressure relief efficiency. Furthermore, when the groove structure 211 is located at the corner, its position is more dispersed, which can improve structural stability and better support the internal electrode assembly 24.

[0134] Figures 9 and 10 show bottom views of multiple battery cells 20 in other embodiments of this application. For example, Figures 9 and 10 may be different implementations of the multiple battery cells 20 from those shown in Figure 8.

[0135] In some embodiments, the first wall 21 may include at least one groove structure 211 located at an edge position. For example, as shown in FIG9, taking the example that each groove structure 211 is located at the two opposite edges of the first wall 21 along its width direction, and taking the width direction of the first wall 21 as the thickness direction Y, for any one of the groove structures 211: in the two side walls 221 that are opposite each other along the length direction X, the groove structure 211 has a gap with each of the two side walls 221; while in the two side walls 221 that are opposite each other along the thickness direction Y, the groove structure 211 has a gap with one of the side walls 221, but no gap with the other side wall 221.

[0136] For example, unlike what is shown in Figure 9, if the first wall 21 includes groove structures 211 located at the two opposite edges along its length direction, where the length direction of the first wall 21 is the length direction X, then for the groove structure 211: among the two side walls 221 arranged opposite each other along the length direction X, the groove structure 211 has a gap with one of the side walls 221, but no gap with the other side wall 221; while among the two side walls 221 arranged opposite each other along the thickness direction Y, the groove structure 211 has a gap with each of the two side walls 221.

[0137] In some embodiments, the groove structure 211 and each sidewall 221 are spaced apart, that is, there is a gap between the groove structure 211 and each sidewall 221. When the battery cell 20 experiences thermal runaway, the gaps around the groove structure 211 can be used to form an exhaust path. Then, the gas between the electrode assembly 24 and the sidewalls 221 in each direction can reach the pressure relief mechanism 212 through the corresponding gaps, which makes it easier for the gas inside the battery cell 20 to reach the pressure relief mechanism 212, thereby improving the pressure relief efficiency.

[0138] As shown in Figure 10, if any groove structure 211 has a gap with each side wall 221, then for the groove structure 211: in the two side walls 221 that are arranged opposite each other along the length direction X, the groove structure 211 has a gap with each of the two side walls 221; and in the two side walls 221 that are arranged opposite each other along the thickness direction Y, the groove structure 211 also has a gap with each of the two side walls 221.

[0139] It should be understood that the position of the first protrusion structure 31 provided in the isolation component 30 of this application embodiment corresponds to the position of the groove structure 211 of the first wall 21 of the corresponding battery cell 20. For example, along the thickness direction of the first wall 21, the orthographic projection of the groove structure 211 covers the orthographic projection of the first protrusion structure 31, so that the first protrusion structure 31 can be accommodated in the groove structure 211.

[0140] It should be understood that the number of groove structures 211 provided on the first wall 21 in this embodiment can be set according to actual application.

[0141] In some embodiments, the first wall 21 is provided with a plurality of groove structures 211, and the pressure relief mechanism 212 is located between the plurality of groove structures 211 along the length direction of the first wall 21. As shown in Figures 7 to 10, taking the length direction of the first wall 21 as the length direction X of the battery cell 20 as an example, considering that the length dimension of the first wall 21 is larger than the width dimension, while maintaining a large area of ​​the pressure relief mechanism 212, it is more convenient to design and process the groove structures 211 by providing a plurality of groove structures 211 located on both sides of the length direction X of the pressure relief mechanism 212. Furthermore, the groove structures 211 on both sides of the length direction X of the pressure relief mechanism 212 can better support the internal electrode assembly 24, so that the internal electrode assembly 24 is more balanced and stable.

[0142] In some embodiments, considering the symmetry of the first wall 21, the number of groove structures 211 on both sides of the pressure relief mechanism 212 of the first wall 21 along the length direction of the first wall 21 is generally the same to facilitate processing.

[0143] In some embodiments, the outer surface of the first wall 21 facing the battery cell 20 is rectangular, and the first wall 21 is provided with four groove structures 211. The pressure relief mechanism 212 is provided with two groove structures 211 on each side along the length of the first wall 21. Considering the limited size of the first wall 21, providing four groove structures 211 can not only improve the support for the internal electrode assembly 24, but also maximize the gap between the multiple groove structures 211 and the wall of the battery cell 20, so that in the event of thermal runaway of the battery cell 20, the internal gas can reach the pressure relief mechanism 212 through these gaps and be smoothly discharged, thereby improving the pressure relief efficiency.

[0144] It should be understood that the first wall 21 of the battery cell 20 may also be provided with other numbers of groove structures 211 to flexibly adapt to different application scenarios. Figure 11 shows a bottom view of multiple battery cells 20 according to another embodiment of this application. For example, Figure 11 may be a different implementation of multiple battery cells 20 than that shown in Figures 8 to 10.

[0145] As shown in Figure 11, when the surface of the first wall 21 facing the outside of the battery cell 20 is rectangular, the first wall 21 can also be provided with two groove structures 211. The pressure relief mechanism 212 is provided with a groove structure 211 on each side along the length of the first wall 21, but the embodiments of this application are not limited to this.

[0146] It should be understood that, for ease of explanation, the embodiments of this application are mainly described below using the first wall 21 shown in FIG8 as an example. However, the relevant descriptions are also applicable to, for example, the embodiments shown in FIG9 to FIG11 or other embodiments. For the sake of brevity, they will not be described in detail here.

[0147] It should be understood that the shape of the groove structure 211 in this application embodiment can be set according to actual application. For example, when the first wall 21 is provided with multiple groove structures 211, the shapes of the multiple groove structures 211 can be the same or different. For ease of description, this application embodiment takes the example of multiple groove structures 211 having the same shape, which is easier to process.

[0148] For example, the groove structure 211 can be cylindrical or other polyhedral shapes. For instance, the groove structure 211 can be cylindrical or prismatic. For ease of description, this application embodiment mainly uses a cuboid groove structure 211 as an example.

[0149] It should be understood that the dimensions of the groove structure 211 in this embodiment can be set according to actual applications. For example, if the first wall 21 is provided with multiple groove structures 211, the dimensions of the multiple groove structures 211 can be the same or different. For ease of description, this embodiment takes the example of multiple groove structures 211 having the same dimensions, which is easier to process.

[0150] In some embodiments, the dimensions of the groove structure 211 may be related to the dimensions and position of the pressure relief mechanism 212.

[0151] In some embodiments, the minimum distance L12 between the groove structure 211 and the pressure relief mechanism 212 along the length direction of the first wall 21 is greater than or equal to 8 mm. For example, taking the length direction of the first wall 21 as the length direction X, setting the minimum distance L12 between the groove structure 211 and the pressure relief mechanism 212 to be greater than or equal to 8 mm can reduce the mutual influence between the groove structure 211 and the pressure relief mechanism 212 during the processing, improve the structural strength, and reduce stress concentration.

[0152] In some embodiments, the minimum distance L12 between the groove structure 211 and the pressure relief mechanism 212 along the length of the first wall 21 should not be too large. For example, the distance L12 can be limited according to the size of the first wall 21. For example, the distance L12 is usually less than or equal to 20 mm so as to effectively support the electrode assembly 24 and maintain the gap between the electrode assembly 24 and the pressure relief mechanism 212 in the event of thermal runaway of the battery cell 20.

[0153] In some embodiments, along the length direction of the first wall 21, the minimum distance L12 between the groove structure 211 and the pressure relief mechanism 212 can be any one of the following values ​​or between any two of the following values: 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm.

[0154] In some embodiments, along the length direction of the first wall 21, the ratio of the length L1 of the groove structure 211 to the length L2 of the pressure relief mechanism 212 is greater than or equal to 1 / 7 and less than or equal to 1 / 2. For example, taking the length direction of the first wall 21 as the length direction X, the length L1 of the groove structure 211 refers to the maximum distance between the two ends of the groove structure 211 in the length direction X; the length L2 of the pressure relief mechanism 212 refers to the maximum distance between the two ends of the pressure relief mechanism 212 in the length direction X.

[0155] By setting the ratio of length L1 to length L2 to be greater than or equal to 1 / 7, the length L1 of the groove structure 211 can be prevented from being too small, thus effectively supporting the electrode assembly 24. This maintains the gap between the electrode assembly 24 and the pressure relief mechanism 212 during thermal runaway of the battery cell 20 and reduces stress concentration. Conversely, setting the ratio of length L1 to length L2 to be less than or equal to 1 / 2 limits the length L2 of the groove structure 211 from being too large, allowing for a more reasonable placement of the groove structure 211 on the first wall 21. This facilitates processing and reduces the obstruction of the groove structure 211 from the flow of gas inside the battery cell 20 along the width direction of the first wall 21 to the pressure relief mechanism 212 during thermal runaway of the battery cell 20, thereby improving exhaust efficiency.

[0156] In some embodiments, along the length direction of the first wall 21, the ratio of the length L1 of the groove structure 211 to the length L2 of the pressure relief mechanism 212 can be any one of the following values ​​or between any two of the following values: 1 / 7, 1 / 6, 1 / 5, 1 / 4, 2 / 7, 1 / 3, 2 / 5, 3 / 7 or 1 / 2.

[0157] In some embodiments, along the width direction of the first wall 21, the ratio of the width W1 of the groove structure 211 to the width W2 of the pressure relief mechanism 212 is greater than or equal to 1 / 4 and less than or equal to 1 / 3. For example, taking the width direction of the first wall 21 as the thickness direction Y, the width W1 of the groove structure 211 refers to the maximum distance between the two ends of the groove structure 211 in the thickness direction Y; the width W2 of the pressure relief mechanism 212 refers to the maximum distance between the two ends of the pressure relief mechanism 212 in the thickness direction Y.

[0158] By setting the ratio of width W1 to width W2 to be greater than or equal to 1 / 4, the width W1 of the groove structure 211 can be prevented from being too small, thus effectively supporting the electrode assembly 24. This maintains the gap between the electrode assembly 24 and the pressure relief mechanism 212 during thermal runaway of the battery cell 20 and reduces stress concentration. Conversely, setting the ratio of width W1 to width W2 to be less than or equal to 1 / 3 limits the width W1 of the groove structure 211 from being too large, allowing for a more reasonable placement of the groove structure 211 on the first wall 21. This facilitates processing and reduces the obstruction of the groove structure 211 from the flow of gas inside the battery cell 20 along the length of the first wall 21 to the pressure relief mechanism 212 during thermal runaway of the battery cell 20, thereby improving exhaust efficiency.

[0159] In some embodiments, along the width direction of the first wall 21, the ratio of the width W1 of the groove structure 211 to the width W2 of the pressure relief mechanism 212 can be any one of the following values ​​or between any two of the following values: 1 / 4, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32 or 1 / 3.

[0160] It should be understood that the relevant dimensions of the aforementioned groove structure 211 can be the dimensions of the side of the groove structure 211 facing the isolation member 30, and correspondingly, the relevant dimensions of the pressure relief mechanism 212 can be the dimensions of the side of the pressure relief mechanism 212 facing the isolation member 30.

[0161] In some embodiments, the size of the first protrusion structure 31 can be set according to the actual application. For example, the size of the first protrusion structure 31 can be related to the size of the groove structure 211. FIG12 shows a top view of the isolation member 30 of an embodiment of the present application. For example, the isolation member 30 can be a top view of the isolation member 30 included in the battery device 100 shown in FIG2, and the isolation member 30 shown in FIG12 can be disposed on the side of the first wall 21 of the plurality of battery cells 20 away from the interior of the battery cell 20 as shown in FIG8. FIG13 is a top view of the plurality of battery cells 20 and the isolation member 30 of an embodiment of the present application. For example, FIG13 can be a top view of the structure shown in FIG7. FIG14 shows a cross-sectional view of the plurality of battery cells 20 and the isolation member 30 of an embodiment of the present application. For example, FIG14 can be a cross-sectional view along the B-B' direction shown in FIG13. FIG15 shows another cross-sectional view of the battery cell 20 of an embodiment of the present application. For example, FIG15 can be a schematic diagram of the battery cell 20 in the cross-sectional view shown in FIG14. Figure 16 shows a cross-sectional schematic diagram of the isolation component 30 according to an embodiment of the present application. For example, Figure 16 can be a schematic diagram of the isolation component 30 in the cross-sectional schematic diagram shown in Figure 14.

[0162] The dimensions of the first protrusion structure 31 and the groove structure 211 of the embodiments of this application will be described below with reference to Figures 12 to 16.

[0163] In some embodiments, along the length direction of the first wall 21, the length L1 of the groove structure 211 is greater than or equal to the length L3 of the first protrusion structure 31. Taking the length direction of the first wall 21 as the length direction X of the battery cell 20 as an example, the length L3 of the first protrusion structure 31 refers to the maximum distance between the two ends of the first protrusion structure 31 along the length direction X. By setting the length L1 to be greater than or equal to the length L3, it is easier for the first protrusion structure 31 to be accommodated within the groove structure 211.

[0164] Similarly, along the width direction of the first wall 21, the width W1 of the groove structure 211 is greater than or equal to the width W3 of the first protrusion structure 31. Taking the width direction of the first wall 21 as the thickness direction Y of the battery cell 20 as an example, the width W3 of the first protrusion structure 31 refers to the maximum distance between the two ends of the first protrusion structure 31 in the thickness direction Y. By setting the width W1 to be greater than or equal to the width W3, it is easier for the first protrusion structure 31 to be accommodated within the groove structure 211.

[0165] Similarly, the recess depth H1 of the groove structure 211 is greater than or equal to the protrusion height H3 of the first protrusion structure 31. The recess depth H1 of the groove structure 211 refers to the distance from the opening surface to the bottom surface of the groove structure 211 in the recess direction, such as the thickness direction of the first wall 21. The protrusion height H3 of the first protrusion structure 31 refers to the distance between the farthest end face of the first protrusion structure 31 from the isolation member 30 and the surface of the isolation member 30 in the protrusion direction, such as the protrusion direction which is usually consistent with the recess direction of the groove structure 211. By setting the recess depth H1 to be greater than or equal to the protrusion height H3, it is easier for the first protrusion structure 31 to be accommodated within the groove structure 211.

[0166] In some embodiments, the difference between the dimensions of the groove structure 211 and the first protrusion structure 31 generally satisfies at least one of the following conditions: along the length direction of the first wall 21, the length L1 of the groove structure 211 and the length L3 of the first protrusion structure 31 are greater than or equal to 0.2 mm and less than or equal to 1 mm; along the width direction of the first wall 21, the difference between the width W1 of the groove structure 211 and the width W3 of the first protrusion structure 31 is greater than or equal to 0.2 mm and less than or equal to 1 mm; the difference between the recess depth H1 of the groove structure 211 and the protrusion height H3 of the first protrusion structure 31 is greater than or equal to 0.4 mm and less than or equal to 1.2 mm.

[0167] Considering manufacturing and assembly tolerances, setting the minimum value of the aforementioned difference can improve the assembly efficiency between the groove structure 211 and the first protrusion structure 31. Setting the maximum value of the aforementioned difference can limit the gap between the groove structure 211 and the first protrusion structure 31 from becoming too large, thereby improving structural strength and the installation stability between the battery cell 20 and the separator 30. Taking the adhesion and fixing of the groove structure 211 and the first protrusion structure 31 with adhesive as an example, placing adhesive in the gap between the groove structure 211 and the first protrusion structure 31 limits the gap from becoming too large, reduces the amount of adhesive needed, improves structural strength, and reduces misalignment between the groove structure 211 and the first protrusion structure 31.

[0168] In some embodiments, along the length direction of the first wall 21, the length L1 of the groove structure 211 and the length L3 of the first protrusion structure 31 can be any one of the following values ​​or be between any two of the following values: 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm.

[0169] In some embodiments, along the width direction of the first wall 21, the difference between the width W1 of the groove structure 211 and the width W3 of the first protrusion structure 31 can be any one of the following values ​​or between any two of the following values: 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm.

[0170] In some embodiments, the difference between the recess depth H1 of the groove structure 211 and the protrusion height H3 of the first protrusion structure 31 can be any one of the following values ​​or between any two of the following values: 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm or 1.2mm.

[0171] In some embodiments, the recess depth H1 of the groove structure 211 is greater than or equal to 0.8 mm and less than or equal to 2 mm. Setting the recess depth H1 to be greater than or equal to 0.8 mm can increase the space accommodated by the first protrusion structure 31 and improve structural stability. In addition, when the thickness of the groove structure 211 is approximately the thickness of the first wall 21, the inward protrusion height of the groove structure 211 is not too small, so as to effectively support the electrode assembly 24. Setting the recess depth H1 to be less than or equal to 2 mm can limit the space occupied by the groove structure 211 and increase the energy density of the battery cell 20.

[0172] In some embodiments, the recess depth H1 of the groove structure 211 can be any one of the following values ​​or between any two of the following values: 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm.

[0173] It should be understood that the isolation component 30 in this embodiment can be used to isolate the electrical cavity 11 and the collection cavity 12. For example, the isolation component 30 can also be a thermal management component for regulating the temperature of the battery cell 20.

[0174] In some embodiments, the isolation component 30 is provided with a flow channel 35, which contains a heat exchange medium to regulate the temperature of the battery cell 20. Specifically, the "heat exchange medium" in this embodiment can heat or cool the battery cell 20 through its own heat transfer or phase change. Exemplarily, the heat exchange medium may include a fluid, for example, a liquid or a gas; and / or, the heat exchange medium may include a phase change material, for example, a solid-liquid phase change material and / or a gas-liquid phase change material, wherein the solid-liquid phase change material is initially solid and can become liquid after absorbing heat, while the gas-liquid phase change material absorbs heat during the vaporization process and releases heat during the condensation process; regulating the temperature refers to heating or cooling multiple battery cells 20. In the case of cooling or cooling the battery cells 20, the thermal management component is used to contain a cooling fluid or phase change material to reduce the temperature of multiple battery cells 20. In this case, the thermal management component may also be called a cooling component, a cooling system, or a cooling plate, etc., and the fluid it contains may also be called a cooling medium or cooling fluid, more specifically, a coolant or a cooling gas. In addition, the thermal management component can also be used to heat multiple battery cells to a temperature of 20 degrees Celsius, but this application embodiment is not limited to this.

[0175] Optionally, the fluid can be circulated to achieve better temperature regulation. Alternatively, the fluid can be water, a mixture of water and ethylene glycol, or air, etc.

[0176] In some embodiments, the isolation component 30 may include one or more flow channels 35. When the isolation component 30 includes multiple flow channels 35, the materials in different flow channels 35 may be the same or different to flexibly adapt to different scenarios.

[0177] In some embodiments, the position of the first protrusion structure 31 may be related to the flow channel 35. FIG17 shows a schematic diagram of the structure of a plurality of battery cells 20 and isolation components 30 according to another embodiment of the present application. For example, FIG17 may be another possible implementation of the plurality of battery cells 20 and isolation components 30 included in the battery device 100 shown in FIG2, wherein the structure of the isolation component 30 is different when comparing FIG7 and FIG17.

[0178] In some embodiments, as shown in FIG17, the first protrusion structure 31 is disposed on the sidewall of the flow channel 35 facing the first wall 21, so that the flow channel 35 can not overlap with the pressure relief area 32 or the discharge channel 33, and can also reduce the temperature of the first protrusion structure 31 at least partially contained in the groove structure 211 of the battery cell 20, and further reduce the temperature of the battery cell 20.

[0179] It should be understood that the first protrusion structure 31 in the embodiments of this application can be a solid structure to improve the structural strength and stability of the first protrusion structure 31; or, the first protrusion structure 31 can also be a hollow structure to reduce the weight of the isolation component 30.

[0180] Figure 18 shows a cross-sectional schematic diagram of a plurality of battery cells 20 and an isolation component 30 according to another embodiment of the present application. For example, the cross-section shown in Figure 18 is perpendicular to the length direction X of the battery cell 20, and the cross-section shown in Figure 18 is perpendicular to the cross-section shown in Figure 14.

[0181] In some embodiments, when the first protrusion structure 31 is a hollow structure, it may or may not be connected to the flow channel 35. Compared to a scheme where the first protrusion structure 31 is a solid structure, the hollow first protrusion structure 31 can accommodate a heat exchange medium, and the temperature of the battery cell 20 can be adjusted through the first protrusion structure 31, thereby improving thermal management efficiency.

[0182] In some embodiments, the first protruding structure 31 protrudes in a direction away from the flow channel 35 along a first direction to form a first receiving space 311 that is closed relative to the flow channel 35 together with the isolation component 30; the first receiving space 311 contains a heat exchange medium to regulate the temperature of the battery cell 20. Specifically, the first protruding structure 31 is a hollow structure, and the first protruding structure 31 can form a relatively closed first receiving space 311 together with the isolation component 30, so that the first protruding structure 31 is not connected to the flow channel 35. In this way, the material contained in the first receiving space 311 can be the same as or different from the material in the flow channel 35 to suit different application scenarios.

[0183] In some embodiments, the first protrusion structure 31 forms a first receiving space 311 communicating with the flow channel 35. The first receiving space 311 contains a heat exchange medium to regulate the temperature of the battery cell 20. As shown in FIG18, the side of the first protrusion structure 31 facing the flow channel 35 is recessed relative to the sidewall of the flow channel 35, so that the first protrusion structure 31 is a hollow structure, and the first receiving space 311 inside the first protrusion structure 31 can be used to contain the same material as inside the flow channel 35 to regulate the temperature of the battery cell 20.

[0184] Figure 19 shows a cross-sectional schematic diagram of a plurality of battery cells 20 and an isolation component 30 according to another embodiment of the present application. The cross-section shown in Figure 19 is perpendicular to the length direction X of the battery cell 20. The cross-section shown in Figure 19 is perpendicular to the cross-section shown in Figure 14. Figure 19 may be another embodiment different from that shown in Figure 18.

[0185] In some embodiments, a second protruding structure 34 protruding in a direction away from the first wall 21 is provided on the side of the isolation member 30 away from the first wall 21. Considering that the side of the isolation member 30 away from the first wall 21 can be used to collect emissions from the battery cell 20, for example, the side of the isolation member 30 away from the first wall 21 can be a collection cavity 12, the second protruding structure 34 can be used to support the space of the collection cavity 12. For example, the second protruding structure 34 can be used to abut against the box wall of the housing 10 facing the isolation member 30, for example, the second protruding structure 34 can abut against the bottom wall of the second box portion 14 to increase the overall structural strength of the battery device 100, especially to strengthen the bottom ball protection function of the box wall to maintain sufficient space between the isolation member 30 and the corresponding box wall, for example, to maintain space in the height direction of the collection cavity 12 to improve the collection efficiency of emissions.

[0186] In some embodiments, when the isolation member 30 is provided with a flow channel 35, the second protrusion structure 34 is provided on the side wall of the flow channel 35 away from the first wall 21, especially when the first protrusion structure 31 is provided on the side wall of the flow channel 35 facing the first wall 21, so that the second protrusion structure 34 is provided opposite to the first protrusion structure 31.

[0187] It should be understood that the second protruding structure 34 can also be a hollow structure or a solid structure. Furthermore, if the first protruding structure 31 is a hollow structure, the second protruding structure 34 can also be a hollow structure or a hollow structure; similarly, if the first protruding structure 31 is a solid structure, the second protruding structure 34 can also be a hollow structure or a hollow structure.

[0188] In some embodiments, when the second protrusion structure 34 is hollow, it may or may not be connected to the flow channel 35. Compared to a solution where the second protrusion structure 34 is solid, the hollow second protrusion structure 34 can accommodate a heat exchange medium. The temperature of the battery cell 20 can be adjusted through the second protrusion structure 34, and the temperature of the emissions in the collection chamber 12 can also be adjusted when high-temperature emissions enter the collection chamber 12, thereby improving the thermal management efficiency of the battery device 100.

[0189] In some embodiments, the second protruding structure 34 protrudes in a direction away from the flow channel 35 along a first direction to form a second receiving space 341 that is closed relative to the flow channel 35 together with the isolation member 30. The second receiving space 341 contains a heat exchange medium to regulate the temperature of the battery device 100. Specifically, the second protruding structure 34 is a hollow structure, and the second protruding structure 34 can form a relatively closed second receiving space 341 together with the isolation member 30, so that the second protruding structure 34 is not connected to the flow channel 35. In this way, the material contained in the second receiving space 341 can be the same as or different from the material in the flow channel 35 to suit different application scenarios.

[0190] In some embodiments, the second protrusion structure 34 forms a second receiving space 341 communicating with the flow channel 35. The second receiving space 341 contains a heat exchange medium to regulate the temperature of the battery cell 20. As shown in FIG19, the side of the second protrusion structure 34 facing the flow channel 35 is recessed relative to the sidewall of the flow channel 35, that is, the second protrusion structure 34 is a hollow structure and communicates with the flow channel 35. Then, the second receiving space 341 inside the second protrusion structure 34 can also be used to accommodate the heat exchange medium, so that the isolation component 30 can accommodate more heat exchange medium to improve the temperature regulation efficiency of the battery cell 20.

[0191] In some embodiments, a thermally conductive insulating layer is provided on the surface of the first protrusion structure 31 facing the groove structure 211. This surface includes the surface of the bottom wall of the first protrusion structure 31 facing the groove structure 211 and the surface of the sidewalls facing the groove structure 211. By providing a thermally conductive insulating layer on the surface of the first protrusion structure 31, heat from the battery cell 20 can be transferred to regulate its temperature, and the insulation performance between the groove structure 211 and the first protrusion structure 31 can be improved.

[0192] According to some embodiments of this application, this application also provides an electrical device including the battery device 100 described in any of the above embodiments, and the battery device 100 is used to provide electrical energy to the electrical device.

[0193] The electrical equipment can be any of the aforementioned devices or systems that utilize battery devices 100.

[0194] According to some embodiments of this application, referring to Figures 2 to 19, this application provides a battery device 100, including: a battery cell 20, the battery cell 20 including a housing 22 and an electrode assembly 24, the electrode assembly 24 being housed within the housing 22, the housing 22 including a first wall 21, the first wall 21 being disposed opposite to the electrode assembly 24 along a first direction; the first wall 21 including a groove structure 211 and a connecting region 213, the groove structure 211 being recessed towards the interior of the battery cell 20 relative to the connecting region 213 along the first direction, and the groove structure 211... The surface of 1 facing the interior of the battery cell 20 protrudes from the surface of the connection area 213 facing the interior of the battery cell 20; the battery cell 20 also includes a pressure relief mechanism 212, which is disposed in the connection area 213; the isolation member 30 is located on the side of the first wall 21 away from the interior of the battery cell 20 along the first direction, and the side of the isolation member 30 facing the first wall 21 is provided with a first protrusion structure 31 protruding toward the groove structure 211, at least a portion of the first protrusion structure 31 being accommodated in the groove structure 211.

[0195] The housing 22 also includes a plurality of sidewalls 221 connected to the edge of the first wall 21 and surrounding the electrode assembly 24; the groove structure 211 is spaced apart from at least one of the plurality of sidewalls 221. The first wall 21 is provided with a plurality of groove structures 211, and the pressure relief mechanism 212 is located between the plurality of groove structures 211 along the length direction of the first wall 21.

[0196] The isolation component 30 is provided with a flow channel 35, and a first protrusion structure 31 is provided on the side wall of the flow channel 35 facing the first wall 21. The flow channel 35 contains a heat exchange medium to regulate the temperature of the battery cell 20. The first protrusion structure 31 protrudes in a direction away from the flow channel 35 along a first direction to form a first receiving space 311 closed relative to the flow channel 35 together with the isolation component 30. The first receiving space 311 contains a heat exchange medium to regulate the temperature of the battery cell 20; or, the first protrusion structure 31 forms a first receiving space 311 communicating with the flow channel 35, and the first receiving space 311 contains a heat exchange medium to regulate the temperature of the battery cell 20.

[0197] The isolation component 30 has a second protruding structure 34 on the side away from the first wall 21, protruding in a direction away from the first wall 21. The isolation component 30 has a flow channel 35. The first protruding structure 31 is disposed on the side wall of the flow channel 35 facing the first wall 21, and the second protruding structure 34 is disposed on the side wall of the flow channel 35 away from the first wall 21. The second protruding structure 34 protrudes in a first direction away from the flow channel 35 to form a second receiving space 341 closed relative to the flow channel 35 together with the isolation component 30. The second receiving space 341 contains a heat exchange medium to regulate the temperature of the battery device. Alternatively, the second protruding structure 34 forms a second receiving space 341 communicating with the flow channel 35. The second receiving space 341 contains a heat exchange medium to regulate the temperature of the battery cell 20.

[0198] The battery device 100 further includes: a housing 10, which includes an electrical cavity 11 and a collection cavity 12. The electrical cavity 11 is used to accommodate multiple battery cells 20. An isolation component 30 is used to isolate the electrical cavity 11 and the collection cavity 12. The isolation component 30 includes a pressure relief area 32 corresponding to a pressure relief mechanism 212. The pressure relief area 32 is provided with a pressure relief hole that is at least partially opposite to the pressure relief mechanism 212, or the pressure relief area 32 is configured to break under the action of the discharge emitted by the pressure relief mechanism 212. The isolation component 30 has a discharge channel 33 inside. The pressure relief area 32 is disposed on the side wall of the discharge channel 33 facing the first wall 21. The discharge channel 33 communicates with the collection cavity 12 so that the discharge passes through the pressure relief area 32 into the discharge channel 33 and is discharged into the collection cavity 12.

[0199] Along the first direction, the isolation component 30 supports the battery cell 20.

[0200] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A battery cell (20) includes a housing (22) and an electrode assembly (24), the electrode assembly (24) being housed within the housing (22). The housing (22) includes a first wall (21) disposed opposite to the electrode assembly (24) along a first direction. The first wall (21) includes a groove structure (211) and a connection region (213). The groove structure (211) is recessed towards the interior of the battery cell (20) relative to the connection region (213) along the first direction, and the surface of the groove structure (211) facing the interior of the battery cell (20) protrudes from the connection region. The surface of the domain (213) facing the interior of the battery cell (20); the battery cell (20) further includes a pressure relief mechanism (212) disposed in the connection area (213); an isolation member (30) located on the side of the first wall (21) away from the interior of the battery cell (20) along the first direction, the side of the isolation member (30) facing the first wall (21) having a first protrusion structure (31) protruding toward the groove structure (211), at least a portion of the first protrusion structure (31) being accommodated in the groove structure (211).

2. The battery device according to claim 1, characterized in that, The housing (22) also includes a plurality of sidewalls (221), which are connected to the edge of the first wall (21) and surround the electrode assembly (24); the groove structure (211) is spaced apart from at least one of the plurality of sidewalls (221).

3. The battery device according to claim 2, characterized in that, The first wall (21) is provided with the groove structure (211) at each corner.

4. The battery device according to claim 1, characterized in that, The first wall (21) is provided with a plurality of groove structures (211), and the pressure relief mechanism (212) is located between the plurality of groove structures (211) along the length direction of the first wall (21).

5. The battery device according to claim 4, characterized in that, The surface of the first wall (21) facing the outside of the battery cell (20) is rectangular. The first wall (21) is provided with four groove structures (211). The pressure relief mechanism (212) is provided with two groove structures (211) on each side along the length of the first wall (21).

6. The battery device according to claim 1, characterized in that, The groove structure (211) satisfies at least one of the following conditions: along the length direction of the first wall (21), the minimum distance between the groove structure (211) and the pressure relief mechanism (212) is greater than or equal to 8 mm; along the length direction of the first wall (21), the ratio of the length of the groove structure (211) to the length of the pressure relief mechanism (212) is greater than or equal to 1 / 7 and less than or equal to 1 / 2; along the width direction of the first wall (21), the ratio of the width of the groove structure (211) to the width of the pressure relief mechanism (212) is greater than or equal to 1 / 4 and less than or equal to 1 / 3; along the length of the first wall (21)... In the direction of the first wall (21), the length of the groove structure (211) and the length of the first protrusion structure (31) are greater than or equal to 0.2 mm and less than or equal to 1 mm; along the width direction of the first wall (21), the difference between the width of the groove structure (211) and the width of the first protrusion structure (31) is greater than or equal to 0.2 mm and less than or equal to 1 mm; the difference between the depth of the groove structure (211) and the height of the protrusion of the first protrusion structure (31) is greater than or equal to 0.4 mm and less than or equal to 1.2 mm; the depth of the groove structure (211) is greater than or equal to 0.8 mm and less than or equal to 2 mm.

7. The battery device according to claim 1, characterized in that, The isolation component (30) is provided with a flow channel (35), and the first protrusion structure (31) is provided on the side wall of the flow channel (35) facing the first wall (21); the flow channel (35) contains a heat exchange medium to regulate the temperature of the battery cell (20).

8. The battery device according to claim 7, characterized in that, The first protruding structure (31) protrudes in the direction away from the flow channel (35) along the first direction, so as to form a first receiving space (311) closed relative to the flow channel (35) together with the isolation component (30); the first receiving space (311) contains a heat exchange medium to regulate the temperature of the battery cell (20); or, the first protruding structure (31) forms a first receiving space (311) communicating with the flow channel (35), the first receiving space (311) contains a heat exchange medium to regulate the temperature of the battery cell (20).

9. The battery device according to claim 1, characterized in that, The isolation component (30) has a second protrusion structure (34) on the side away from the first wall (21). The second protrusion structure (34) protrudes in a direction away from the first wall (21).

10. The battery device according to claim 9, characterized in that, The isolation component (30) is provided with a flow channel (35), the first protrusion structure (31) is provided on the side wall of the flow channel (35) facing the first wall (21), and the second protrusion structure (34) is provided on the side wall of the flow channel (35) away from the first wall (21); wherein, the second protrusion structure (34) protrudes in the direction away from the flow channel (35) along the first direction, so as to form a second receiving space (341) closed relative to the flow channel (35) together with the isolation component (30), the second receiving space (341) contains a heat exchange medium to regulate the temperature of the battery device; or, the second protrusion structure (34) forms a second receiving space (341) communicating with the flow channel (35), the second receiving space (341) contains a heat exchange medium to regulate the temperature of the battery cell (20).

11. The battery device according to any one of claims 1 to 10, characterized in that, The battery device further includes: a housing (10) including an electrical cavity (11) and a collection cavity (12), the electrical cavity (11) for accommodating a plurality of battery cells (20), an isolation component (30) for isolating the electrical cavity (11) and the collection cavity (12), the isolation component (30) including a pressure relief area (32) corresponding to the pressure relief mechanism (212), the pressure relief area (32) being provided with a pressure relief hole at least partially opposite to the pressure relief mechanism (212), or the pressure relief area (32) being configured to break under the action of emissions emitted by the pressure relief mechanism (212).

12. The battery device according to claim 11, characterized in that, The isolation component (30) has an internal discharge channel (33), and the pressure relief area (32) is disposed on the side wall of the discharge channel (33) facing the first wall (21). The discharge channel (33) is connected to the collection chamber (12) so that the discharge material passes through the pressure relief area (32) into the discharge channel (33) and is discharged into the collection chamber (12).

13. The battery device according to claim 12, characterized in that, The battery device includes a plurality of battery cells (20) arranged along a first direction, and the discharge channel (33) extends along the first direction. The discharge channel (33) includes a plurality of pressure relief areas (32), and the plurality of pressure relief areas (32) correspond one-to-one with the pressure relief mechanism (212) of the plurality of battery cells (20).

14. The battery device according to any one of claims 1 to 10, characterized in that, Along the first direction, the isolation component (30) supports the battery cell (20).

15. The battery device according to any one of claims 1 to 10, characterized in that, The surface of the first protrusion structure (31) facing the groove structure (211) is provided with a thermally conductive insulating layer.

16. An electrical appliance, characterized in that, include: The battery device according to any one of claims 1 to 15.

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