Battery cell, battery device, energy storage device, and electric device

Abstract

The application relates to the technical field of batteries, and provides a battery monomer, a battery device, an energy storage device and a power utilization device. The battery monomer comprises an insulating piece, an insulating film layer of the insulating piece comprises a first film layer surface, and the first film layer surface is located between a bottom wall and an electrode assembly. Each first film layer surface of the insulating film layer is provided with a through structure penetrating in the thickness direction of the first film layer surface, and the projection of the through structure on the adjacent first film layer surface is staggered in the thickness direction of the first film layer surface. The battery monomer provided by the application can make electrolyte penetrate between adjacent insulating film layers from the through structure of the first film layer surface of the outermost layer, and more smoothly penetrate to the innermost part and soak the electrode assembly through the through structure provided on each first film layer surface, so that the penetration rate of the insulating piece under the gravity of the electrode assembly can be effectively improved, and the penetration influence of the gravity of the electrode assembly on the insulating piece can be reduced.

Description

Technical Field

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

[0002] With the development of new energy technologies, batteries are being used more and more widely, such as in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] In the manufacturing process of a battery cell, the insulating component, serving as a barrier between the electrode assembly and the casing, plays a crucial role. For example, during the filling process, electrolyte needs to be filled into the battery cell to ensure that the electrolyte fully wets the electrode assembly. However, because the weight of the electrode assembly is applied to the bottom part of the insulating component, the ability of the bottom part of the insulating component to permeate with electrolyte is affected. Utility Model Content

[0004] The purpose of this application is to provide a battery cell, a battery device, an energy storage device, and an electrical device, aiming to solve the problem that when the insulating component is subjected to the gravity of the electrode assembly, it will affect the penetration effect of the electrolyte, thus affecting the wetting effect of the electrode assembly.

[0005] To achieve the above objectives, the technical solution adopted in the embodiments of this application is as follows: In a first aspect, embodiments of this application provide a battery cell, including a casing, an electrode assembly, and an insulating component. The casing has an internal cavity and a bottom wall, and the electrode assembly is housed within the cavity. The insulating component is disposed between the casing and the electrode assembly for covering the electrode assembly. The insulating component includes at least two stacked insulating film layers. Each insulating film layer includes a first film layer located between the bottom wall and the electrode assembly. Each first film layer has a conductive structure extending along the thickness direction of the first film layer, and the projections of the conductive structures on adjacent first film layers are staggered along the thickness direction of the first film layer.

[0006] The beneficial effects of the embodiments of this application are as follows: The battery cell provided in this application includes an insulating member formed by at least two stacked insulating film layers. By opening a through conductive structure on the first film layer of each insulating film layer and setting the conductive structures on adjacent first film layers to be staggered, the electrolyte can penetrate from the conductive structure on the first film layer of the outermost insulating film layer to the space between adjacent insulating film layers. Furthermore, the electrolyte can penetrate more smoothly to the innermost layer and wet the electrode assembly through the conductive structure on each first film layer. In this way, the penetration rate of the insulating member under the gravity of the electrode assembly can be effectively improved, thereby reducing the impact of the gravity of the electrode assembly on the penetration of the insulating member, thus improving the wetting effect of the electrode assembly and improving the service life and reliability of the electrode assembly.

[0007] In some embodiments, the insulating element further includes an adhesive layer, which connects any two adjacent insulating film layers, and the adhesive layer is provided with a clearance opening; the first membrane layer includes a permeation region, and a conductive structure is disposed within the permeation region; in the same projection plane perpendicular to the thickness direction of the first membrane layer, the orthographic projection of the clearance opening covers the orthographic projection of the permeation region.

[0008] By adopting the above technical solution, adjacent insulating film layers can be bonded and fixed with adhesive layers. At the same time, avoidance holes are opened on the adhesive layers to reduce the probability of the adhesive layers blocking the conductive structure, thereby allowing the electrolyte to penetrate into the interior more smoothly through the conductive structure opened on each insulating film layer.

[0009] In some embodiments, the area of ​​the permeation region is m, and the area of ​​the first membrane layer is n; wherein, 0.15≤m / n≤0.7.

[0010] By adopting the above technical solution, the ratio of the area m of the permeation region to the area n of the first membrane layer is limited to greater than or equal to 0.15 and less than or equal to 0.7. This allows the area of ​​the permeation region to meet the requirements of the permeation electrolyte within a certain range, while not affecting the gripping operation of the first membrane layer or the adhesion stability of the multilayer first membrane layers.

[0011] In some embodiments, the conductive structure is a through hole; or, the conductive structure is a notch.

[0012] By adopting the above technical solution, the conductive structure can be a through hole or a cut, and the electrolyte can penetrate through the through hole or cut on the first film layer of each insulating film layer to improve the wetting effect on the internal electrode components.

[0013] In some embodiments, the insulating member further includes a support structure disposed between two adjacent first film layers and used to form an impregnation channel between the two adjacent first film layers, the impregnation channel being connected to a conductive structure formed on the two adjacent first film layers.

[0014] By adopting the above technical solution, a support structure is used to support the two adjacent first membrane layers, so that a wetting channel is formed between the two adjacent first membrane layers. In this way, the electrolyte can flow more smoothly between the conductive structures of the two adjacent first membrane layers through the wetting channel, thereby further improving the electrolyte penetration rate and the wetting effect of the electrode assembly.

[0015] In some embodiments, a plurality of conductive structures are provided on each first membrane layer, and the plurality of conductive structures are distributed sequentially at intervals along a first direction, wherein the first direction is perpendicular to the thickness direction of the first membrane layer; in the first direction, the conductive structures provided on two adjacent first membrane layers are arranged alternately; and in the first direction, a support structure is provided between any conductive structure provided on one of two adjacent first membrane layers and an adjacent conductive structure provided on the other layer.

[0016] By adopting the above technical solution, by setting a support structure between two adjacent conductive structures arranged alternately in the first direction, the conductive structure opened on one of the two adjacent first membrane layers can form a connection with the adjacent conductive structure opened on the other layer through the wetting channel. This can effectively improve the efficiency of electrolyte penetration between the multilayer stacked insulating membrane layers, thereby improving the wetting effect of the internal electrode assembly.

[0017] In some embodiments, a plurality of conductive structures are provided on each first membrane layer, and the plurality of conductive structures are distributed sequentially at intervals along a first direction, wherein the first direction is perpendicular to the thickness direction of the first membrane layer; in the first direction, the conductive structures provided on two adjacent first membrane layers are arranged alternately; the support structure extends along the first direction to form a plurality of wetting channels, and each wetting channel is sequentially connected to a plurality of conductive structures.

[0018] By adopting the above technical solution, at least one conductive structure opened on one of the two adjacent first membrane layers can form a connection with at least one adjacent conductive structure opened on the other layer through the wetting channel. This can effectively improve the efficiency of electrolyte penetration between the multilayer stacked insulating membrane layers, thereby improving the wetting effect of the internal electrode assembly.

[0019] In some embodiments, the number of support structures between any two adjacent conductive structures in the first direction is multiple, and the multiple support structures are sequentially spaced along the second direction; wherein, the second direction is perpendicular to both the first direction and the thickness direction of the first membrane layer.

[0020] By adopting the above technical solution, multiple support structures are used to support and form multiple wetting channels between two adjacent first membrane layers, so as to further improve the penetration efficiency of electrolyte, thereby further improving the wetting rate and wetting effect of electrode assembly.

[0021] In some embodiments, the support structure is a cylindrical structure, and the axial direction of the cylindrical structure is parallel to the first direction.

[0022] By adopting the above technical solution, and by using a cylindrical structure for the support structure, the probability of the arc-shaped surface of the cylindrical structure causing damage to the first membrane layer is low.

[0023] In some embodiments, the support structure is a solid structure; or, the support structure is a hollow structure.

[0024] By adopting the above technical solutions, the support structure is stronger when it is solid, which can improve the service life of the support structure; or, the support structure is lighter when it is hollow, which can reduce the impact of the support structure on the overall weight of the battery cell.

[0025] In some embodiments, the housing further includes a sidewall connected to and intersecting with the bottom wall; an clearance groove is formed at the angle between the bottom wall and the sidewall; the insulating film layer further includes a second film layer disposed between the electrode assembly and the sidewall, the second film layer being connected to the first film layer, and a corner being formed between the first film layer and the second film layer; the corner is accommodated within the clearance groove.

[0026] By adopting the above technical solution, by opening a relief groove at the angle between the bottom wall and the side wall to avoid and accommodate the corner formed between the first membrane layer and the second membrane layer, the influence of the inner surface of the receiving cavity on the corner formed by the insulating component can be effectively reduced.

[0027] Secondly, embodiments of this application also provide a battery device, including the battery cell as described above.

[0028] The beneficial effects of the embodiments of this application are as follows: The battery device provided in the embodiments of this application includes the above-mentioned battery cell. When the electrode components of the battery cell can be fully wetted, the stability of the battery cell is better, and thus the stability of the battery device is also better.

[0029] Thirdly, embodiments of this application also provide an energy storage device, including a battery cell or a battery device as described above, wherein the battery cell or battery device is used to store or provide electrical energy.

[0030] The beneficial effects of the embodiments of this application are as follows: The energy storage device provided in the embodiments of this application has better stability than the above-mentioned battery cells or battery devices.

[0031] Fourthly, embodiments of this application also provide an electrical device, including a battery cell as described above, or a battery device as described above, or an energy storage device as described above, wherein the battery cell or battery device is used to store or provide electrical energy.

[0032] The beneficial effects of the embodiments of this application are as follows: The electrical device provided by the embodiments of this application has better stability when it includes at least one of the battery cell as described above or the battery device and energy storage device as described above. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the vehicle structure provided in an embodiment of this application; Figure 2 An exploded view of the battery device provided in the embodiments of this application; Figure 3 This is an exploded structural diagram of a battery cell provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of an insulating component covering an electrode assembly, as provided in an embodiment of this application. Figure 5 Exploded view of the insulating component provided in the embodiments of this application; Figure 6 A schematic diagram showing the distribution of the conductive structure and a support structure between two adjacent first membrane layers provided in an embodiment of this application; Figure 7 A partial cross-sectional view of the first membrane layer provided for an embodiment of this application; Figure 8 A partial cross-sectional view of the first membrane layer provided in an embodiment of this application; Figure 9 A schematic diagram showing the distribution of the conductive structure and another support structure between two adjacent first membrane layers provided in an embodiment of this application; Figure 10 A schematic diagram of the assembly structure of the insulating component and the housing provided in the embodiments of this application; Figure 11 A schematic diagram of an energy storage device provided in an embodiment of this application.

[0035] The following are the labeling elements in the figure: 1000, Vehicles; 2000, Energy storage devices; 100. Battery; 200. Controller; 300. Motor; 10. Box; 11. First box; 12. Second box; 20. Battery cell; 210. Casing; 21. End cap; 21a. Electrode terminal; 22. Housing; 22a. Opening; 221. Receiving cavity; 221a. Bottom wall; 221b. Side wall; 221c. Clearance groove; 23. Electrode assembly; 23a. Tab; 24. Insulating component; 241. Insulating film layer; 241a. First membrane layer; 241a1. Permeation area; 241b. Second membrane layer; 241c. Corner; 242. Conductive structure; 243. Adhesive layer; 243a. Clearance opening; 244. Support structure; 245. Impregnation channel; x, first direction; y, second direction; z, thickness direction of the first membrane layer. Detailed Implementation

[0036] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0037] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in industrial equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0041] In the manufacturing process of battery cells, the insulating component, serving as a barrier between the electrode assembly and the casing, plays a crucial role. For example, during the filling process, electrolyte needs to be filled into the battery cell to ensure sufficient wetting of the electrode assembly. However, because the weight of the electrode assembly is applied to the bottom part of the insulating component, the tightly compacted insulating component, under significant pressure, restricts electrolyte penetration. This slows down the rate at which the electrolyte permeates the electrode assembly, resulting in a slower or incomplete wetting process. This situation will affect the lifespan and stability of the battery cell.

[0042] Based on the above considerations, to address the issue that the insulating component's ability to withstand the gravity of the electrode assembly can affect the electrolyte's penetration and thus the wetting effect of the electrode assembly, a battery cell is designed. This design involves configuring the insulating component of the battery cell as comprising at least two stacked insulating film layers. A conductive structure is formed on the first film layer, which bears the gravity of the electrode assembly. This allows the filled electrolyte to penetrate more smoothly from the outermost first film layer through the conductive structure. Furthermore, the conductive structure on the first film layer of each insulating film layer increases the rate at which the electrolyte penetrates to the innermost electrode assembly. This ensures that the insulating component can still allow for rapid electrolyte penetration even under the gravity of the electrode assembly, thereby improving the wetting rate and effect of the electrolyte on the electrode assembly. Simultaneously, the conductive structures on adjacent first film layers are staggered, effectively reducing the probability that the first film layers of each insulating film layer will form conductive connections between opposite sides of the insulating component, thus reducing the probability of short circuits between the electrode assembly and the casing.

[0043] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0044] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0045] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0046] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0047] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 20, which are connected in series, parallel, or mixed connection via a busbar.

[0048] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 20.

[0049] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 20 into a single module. As an example, the battery module can be formed by bundling multiple battery cells 20 together with cable ties.

[0050] In some embodiments, the battery device may be a battery pack, which includes a housing 10 and one or more battery cell assemblies housed in the housing 10.

[0051] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 10 by fixing the battery module in the housing 10.

[0052] As an example, the battery cell assembly can also be housed in the housing 10 by directly fixing multiple battery cells 20 to the housing 10.

[0053] As an example, the housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are fastened together to form a closed space inside the housing 10 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 11 may be a top cover or a bottom plate.

[0054] As an example, the housing 10 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 10 forms an enclosed space to accommodate the battery cell assembly.

[0055] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0056] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells 20, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0057] In this embodiment of the application, the battery cell 20 can be a secondary battery, which refers to a battery cell 20 that can be used again after the battery cell has been discharged by recharging to activate the active materials.

[0058] The battery cell 20 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.

[0059] According to some embodiments of this application, please refer to Figures 3 to 6This application provides a battery cell 20, including a housing 210, an electrode assembly 23, and an insulating member 24. The housing 210 has a receiving cavity 221 and a bottom wall. The electrode assembly 23 is housed in the receiving cavity 221. The insulating member 24 is disposed between the housing 210 and the electrode assembly 23 and is used to cover the electrode assembly 23. The insulating member 24 includes at least two stacked insulating film layers 241. The insulating film layer 241 includes a first film layer 241a, which is located between the bottom wall 221a and the electrode assembly 23. Each insulating film layer 241 has a conductive structure 242 that extends along the thickness direction z of the first film layer 241 on its first film layer 241a. In the thickness direction z of the first film layer 241a, the projections of the conductive structures 242 on adjacent first film layers 241a are staggered.

[0060] Battery cell 20 refers to the smallest unit that makes up the battery device 100, such as... Figure 3 As shown, Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application.

[0061] The battery cell 20 includes a housing 210 and an electrode assembly 23. In some embodiments, the housing 210 includes an end cap 21 and a casing 22. The battery cell 20 may also include an insulator 24 and other functional components.

[0062] End cap 21 refers to a component that covers the opening 22a of housing 22 to isolate the internal receiving cavity 221 of battery cell 20 from the external environment; the shape of end cap 21 can be adapted to the shape of housing 22 to fit housing 22. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed when subjected to compression and impact, so that battery cell 20 can have higher structural strength and improved safety performance. Functional components such as electrode terminals 21a can be provided on end cap 21. Electrode terminals 21a can be used to electrically connect with electrode assembly 23 for outputting or inputting electrical energy of battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating layer may also be provided on the inner side of the end cap 21. The insulating layer can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating layer may be plastic, rubber, etc.

[0063] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. The internal environment formed by the receiving cavity 221 of the housing 22 can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening 22a can be provided on the housing 22, and the end cap 21 can close the opening 22a to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated, i.e., an integrated shell 210. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The housing 22 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0064] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 23, while the portions of the positive and negative electrode sheets without active material each constitute a tab 23a. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs 23a connect to the electrode terminals 21a to form a current loop.

[0065] The housing 210 has a bottom wall 221a, which refers to the wall surface of the housing 210 located on the bottom side. It should be understood that when the electrode assembly 23 is housed within the receiving cavity 221, the direction of the gravity of the electrode assembly 23 is towards the bottom wall 221a. In some embodiments, when the housing 210 includes a housing 22 and an end cap 21 covering the housing 22, the bottom wall 221a of the housing 210 is the side wall surface opposite to the end cap 21.

[0066] The insulating element 24 refers to a separation structure with better insulation performance. The insulating element 24 covers the surface of the electrode assembly 23 and is used to insulate and separate the electrode assembly 23 from the housing 210, thereby reducing the probability of leakage of the electrode assembly 23. Optionally, the insulating element 24 may be, but is not limited to, an insulating film (such as a polyester film), an insulating sheet, or other structures.

[0067] The insulating member 24 may be wrapped around the surface of the electrode assembly 23 and attached to the surface of the electrode assembly 23; or, the insulating member 24 may wrap around the electrode assembly 23 and form a gap with a portion of the surface of the electrode assembly 23.

[0068] The insulating component 24 includes at least two overlapping insulating film layers 241; optionally, the number of insulating film layers 241 can be two, three, or more, and the multiple insulating film layers 241 are used to form an integral insulating component 24. The insulating film layers 241 can be polyester film layers, etc. Adjacent insulating film layers 241 can be bonded together by applying adhesive, providing backing adhesive, or other methods to form an integral component.

[0069] The insulating film layer 241 includes a first film layer 241a, which refers to the film layer structure located on the side of the electrode assembly 23 opposite to the end cap 21. It should be understood that when the battery cell 20 is in operation, its end cap 21 is generally placed upwards. Therefore, the first film layer 241a will be located below the electrode assembly 23, and the electrode assembly 23 will directly act on the first film layer 241a. Consequently, the ability of the first film layer 241a to permeate electrolyte will be limited under the influence of applied forces.

[0070] Each insulating film layer 241 has a conductive structure 242 on its first film layer 241a. The conductive structure 242 refers to a through-structure that allows passage between opposite sides of the first film layer 241a along its thickness direction z. Optionally, the conductive structure 242 may include a through-hole structure, a slit structure, a window structure, etc. Understandably, the electrolyte can flow and permeate from one side of the first film layer 241a to the other through the conductive structure 242, thus effectively solving the problem of the electrolyte's difficulty in directly permeating through the first film layer 241a.

[0071] The number of conductive structures 242 provided on the first membrane layer 241a of any layer can be one or more. When there are multiple conductive structures 242, the multiple conductive structures 242 can be arranged sequentially at intervals or in an array, etc.

[0072] In the thickness direction z of the first film layer 241a, the projections of the conductive structures 242 on adjacent first film layers 241a are staggered. Thus, the conductive structures 242 on each first film layer 241a are directly opposite to the adjacent first film layer 241a, and the conductive structures 242 on adjacent first film layers 241a are not directly opposite each other. Thus, the first film layers 241a of the stacked multilayer insulating film layers 241 can provide better insulation protection for the electrode assembly 23, and the probability of the electrode assembly 23 short-circuiting with the outer shell through the multilayer first film layers 241a is low.

[0073] The battery cell 20 provided in this application embodiment includes an insulating member 24 formed by at least two stacked insulating film layers 241. By opening through conductive structures 242 on the first film layer 241a of each insulating film layer 241 and setting the conductive structures 242 on adjacent first film layers 241a to be staggered, the electrolyte can penetrate from the conductive structures 242 on the first film layer 241a of the outermost insulating film layer 241 to the spaces between adjacent insulating film layers 241. Furthermore, the electrolyte can penetrate more smoothly to the innermost layer and wet the electrode assembly 23 through the conductive structures 242 on each first film layer 241a. In this way, the penetration rate of the insulating member 24 under the gravity of the electrode assembly 23 can be effectively improved, thereby reducing the impact of the gravity of the electrode assembly 23 on the penetration of the insulating member 24 and improving the wetting effect of the electrode assembly 23, thus improving the service life and reliability of the electrode assembly 23.

[0074] Please refer to Figure 5 and Figure 6 In some embodiments, the insulating member 24 further includes an adhesive layer 243, which connects any two adjacent insulating film layers 241. The adhesive layer 243 is provided with a clearance opening 243a. The first membrane layer 241a includes a permeation region 241a1, and a conductive structure 242 is disposed in the permeation region 241a1. In the same projection plane perpendicular to the thickness direction z of the first membrane layer 241a, the orthographic projection of the clearance opening 243a includes the orthographic projection of the permeation region 241a1.

[0075] The adhesive layer 243 is used to bond two adjacent insulating film layers 241 together to form a whole; in this way, multiple insulating film layers 241 can be bonded together by the adhesive layer 243 to form the entire insulating component 24.

[0076] Optionally, adhesive layer 243 may, but is not limited to, use adhesive structures such as double-sided tape or polyurethane adhesive.

[0077] The adhesive layer 243 has a clearance opening 243a; understandably, the clearance opening 243a refers to the blank area where the adhesive layer 243 is not provided. In this way, two adjacent insulating film layers 241 can form direct contact at the clearance opening 243a.

[0078] The permeation region 241a1 refers to the region on the first membrane layer 241a used to form the conductive structure 242; thus, the electrolyte can permeate into the first membrane layer 241a through the conductive structure 242 at the permeation region 241a1. It should be understood that in the thickness direction z of the first membrane layer 241a, the projections of the permeation regions 241a1 of each first membrane layer 241a coincide; thus, the electrolyte can sequentially permeate into the interior through the conductive structures 242 formed on the permeation regions 241a1 of each first membrane layer 241a.

[0079] Meanwhile, in the same projection plane perpendicular to the thickness direction z of the first membrane layer 241a, the orthographic projection of the avoidance port 243a includes the orthographic projection of the permeation region 241a1; that is, no adhesive layer 243 is provided at the permeation region 241a1 of the first membrane layer 241a, so as to reduce the probability of the adhesive layer 243 blocking the conductive structure 242, thereby reducing the probability of the adhesive layer 243 affecting the permeation region 241a1 permeation of electrolyte.

[0080] For example, in some embodiments, the permeation region 241a1 can be a rectangular region on the first membrane layer 241a, and multiple conductive structures 242 are arranged in an array within the permeation region 241a1; the permeation regions 241a1 of adjacent first membrane layers 241a are arranged opposite to each other, and the conductive structures 242 formed on the adjacent first membrane layers 241a are staggered; in this way, the electrolyte can permeate into the interior through the permeation regions 241a1 of each first membrane layer 241a and through the conductive structures 242.

[0081] With this configuration, adjacent insulating film layers 241 can be bonded and fixed together by adhesive layer 243. At the same time, avoidance holes are opened on adhesive layer 243 to reduce the probability of adhesive layer 243 blocking conductive structure 242, thereby allowing electrolyte to penetrate into the interior more smoothly through conductive structure 242 opened on each insulating film layer 241.

[0082] Please refer to Figure 5 and Figure 6 In some embodiments, the area of ​​the permeation region is m, and the area of ​​the first membrane layer is n; wherein, 0.15≤m / n≤0.7.

[0083] In this embodiment, the ratio of the area m of the permeation region to the area n of the first membrane layer is limited to greater than or equal to 0.15 and less than or equal to 0.7. For example, the ratio of the area m of the permeation region to the area n of the first membrane layer can be, but is not limited to, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, etc.

[0084] This setting limits the ratio of the area m of the permeation region to the area n of the first membrane layer to greater than or equal to 0.15 and less than or equal to 0.7. This ensures that the area of ​​the permeation region can meet the requirements of the permeation electrolyte within a certain range, without affecting the gripping operation of the first membrane layer or the adhesion stability of the multilayer first membrane layer.

[0085] Please refer to Figure 5 and Figure 6 In some embodiments, the conductive structure 242 is a through hole; or, the conductive structure 242 is a cut.

[0086] In this embodiment, the conductive structure 242 can be a through hole, such as a circular through hole, a rectangular through hole, or a polygonal through hole. The number of through holes can be one or more. For example, when there are multiple through holes, the multiple through holes can be arranged in an array.

[0087] Alternatively, the conductive structure 242 can be a cut; a cut refers to a structure such as a slit, scratch, or notch formed by processing the first membrane layer 241a using processing equipment. For example, in some embodiments, the cut can be a straight scratch structure, and the scratch structure can conduct to opposite sides of the first membrane layer 241a.

[0088] The number of incisions can be one or more. For example, when there are multiple incisions, they can be distributed sequentially at intervals.

[0089] With this configuration, the conductive structure 242 can be a through hole or a cut, allowing the electrolyte to penetrate through the through holes or cuts on the first membrane layer 241a of each insulating membrane layer 241, thereby improving the wetting effect on the internal electrode assembly 23.

[0090] Please refer to Figures 5 to 8 In some embodiments, the insulating member 24 further includes a support structure 244, which is disposed between two adjacent first film layers 241a and is used to form an impregnation channel 245 between the two adjacent first film layers 241a. The impregnation channel 245 is connected to a conductive structure 242 formed on the two adjacent first film layers 241a.

[0091] The support structure 244 refers to a structural component used to provide support between two adjacent first membrane layers 241a. Optionally, the support structure 244 may be, but is not limited to, a support block, support plate, support column, or other configuration formed of insulating material. The number of support structures 244 may be one or more.

[0092] Understandably, when a support structure 244 is provided between two adjacent first membrane layers 241a, the support structure 244 can spread the two adjacent first membrane layers 241a apart, and the two adjacent first membrane layers 241a gradually approach each other from the support structure 244 in a direction away from the support structure 244 and form a bond; in this way, the two adjacent first membrane layers 241a will form wetting channels 245 at intervals on the periphery of the support structure 244, and the electrolyte can flow more smoothly in the wetting channels 245.

[0093] The wetting channel 245 is connected to the conductive structure 242 formed on the two adjacent first membrane layers 241a; optionally, the wetting channel 245 can be connected to one or more conductive structures 242 of one of the two adjacent first membrane layers 241a, and at the same time, the wetting channel 245 can also be connected to one or more conductive structures 242 of the other of the two adjacent first membrane layers 241a.

[0094] For example, the impregnation channel 245 formed by the support structure 244 can connect all the conductive structures 242; or, the impregnation channel 245 formed by the support structure 244 can connect only two adjacent conductive structures 242 (i.e., two conductive structures 242 that are staggered between two adjacent first membrane layers 241a).

[0095] In this way, the electrolyte can permeate from one of the first membrane layers 241a through the conductive structure 242 to the space between two adjacent first membrane layers 241a, and then flow through the wetting channel 245 to the conductive structure 242 of another first membrane layer 241a to continue to permeate inward, thereby effectively improving the permeation efficiency of the electrolyte.

[0096] This configuration, utilizing the support structure 244 between adjacent first membrane layers 241a, creates a wetting channel 245 between them. The electrolyte can flow more smoothly through this channel 245 between the conductive structures 242 of the adjacent first membrane layers 241a, further enhancing the electrolyte permeation rate and improving the wetting effect of the electrode assembly 23. Simultaneously, the support structure 244 effectively reduces the probability of excessively tight adhesion between adjacent first membrane layers 241a, which could hinder electrolyte flow and permeation between them.

[0097] Please refer to Figures 5 to 8 In some embodiments, a plurality of conductive structures 242 are provided on each first membrane layer 241a, and the plurality of conductive structures 242 are distributed sequentially at intervals along a first direction X, wherein the first direction X is perpendicular to the thickness direction z of the first membrane layer 241a; in the first direction X, the conductive structures 242 provided on two adjacent first membrane layers 241a are arranged alternately; and in the first direction X, a support structure 244 is provided between any conductive structure 242 provided on one of two adjacent first membrane layers 241a and an adjacent conductive structure 242 provided on the other layer.

[0098] The first direction X can be any direction perpendicular to the thickness direction z of the first film layer 241a. For example, the first direction X can be the length direction of the outer shell 210, or the first direction X can be the width direction of the outer shell 210.

[0099] The number of conductive structures 242 formed on each first membrane layer 241a can be multiple, for example, the number of conductive structures 242 can be any number of two, three or more.

[0100] Multiple conductive structures 242 are sequentially spaced along the first direction X; optionally, the multiple conductive structures 242 can be sequentially spaced along the first direction X to form a column; or, the multiple conductive structures 242 can be sequentially spaced along the first direction X to form two or more columns, and the multiple columns of conductive structures 242 can be arranged along directions intersecting the first direction X, such as... Figure 6 As shown, this can form an array distribution of multiple conductive structures 242.

[0101] In the first direction X, the conductive structures 242 formed on adjacent first membrane layers 241a are arranged alternately. Taking adjacent first membrane layers 241a as the first and second layers of the first membrane layer 241a as an example, in the first direction X, the first conductive structure 242 of the first layer of the first membrane layer 241a, the first conductive structure 242 of the second layer of the first membrane layer 241a, the second conductive structure 242 of the first layer of the first membrane layer 241a, and the second conductive structure 242 of the second layer of the first membrane layer 241a are sequentially distributed, thus forming an alternating arrangement between the conductive structures 242 of the first layer of the first membrane layer 241a and the conductive structures 242 of the second layer of the first membrane layer 241a. Figure 6 As shown, the conductive structure 242 represented by the solid line is the conductive structure 242 opened on the first membrane layer 241a of the first layer, and the conductive structure 242 represented by the dashed line is the conductive structure 242 opened on the second membrane layer 241a.

[0102] In the first direction X, a support structure 244 is provided between any conductive structure 242 formed on one of two adjacent first membrane layers 241a and an adjacent conductive structure 242 formed on the other layer. Continuing with the above example, a support structure 244 can be provided between the first conductive structure 242 of the first membrane layer 241a and the first conductive structure 242 of the second membrane layer 241a, so that the support structure 244 is supported between the first membrane layer 241a and the second membrane layer 241a and forms an impregnation channel 245, and this impregnation channel 245 communicates with the first conductive structure 242 of the first membrane layer 241a and the first conductive structure 242 of the second membrane layer 241a. For example... Figure 6 As shown in the figure, the position of the support structure 244 between the first layer of the first membrane layer 241a and the second layer of the first membrane layer 241a is indicated by a dashed line.

[0103] Thus, in the first direction X, any conductive structure 242 of the first membrane layer 241a and the adjacent conductive structure 242 of the second membrane layer 241a can be connected by an impregnation channel 245 formed by the support structure 244.

[0104] With this configuration, by setting a support structure 244 between two adjacent conductive structures 242 arranged alternately in the first direction X, the conductive structure 242 located on one of the two adjacent first membrane layers 241a can form a connection with the adjacent conductive structure 242 located on the other layer through the wetting channel 245. This can effectively improve the efficiency of electrolyte penetration between the multilayer stacked insulating membrane layers 241, thereby improving the wetting effect of the internal electrode assembly 23.

[0105] Please refer to Figures 5 to 8 In some embodiments, a plurality of conductive structures 242 are provided on each first membrane layer 241a, and the plurality of conductive structures 242 are distributed sequentially at intervals along a first direction x, wherein the first direction x is perpendicular to the thickness direction z of the first membrane layer 241a; in the first direction x, the conductive structures 242 provided on adjacent first membrane layers 241a are arranged alternately; the support structure 244 extends along the first direction x to form a plurality of wetting channels 245, and each wetting channel 245 is sequentially connected to the plurality of conductive structures 242.

[0106] In this embodiment, the support structure 244 can be extended along the first direction x, so that the support structure 244 can form an impregnation channel 245 between two adjacent conductive structures 242 in the first direction x, and the two adjacent conductive structures 242 in the first direction x can be connected through the impregnation channel 245. For example, the support structure 244 can pass through all the conductive structures 242 arranged at intervals along the first direction x in sequence, so that an impregnation channel 245 is formed between any two adjacent conductive structures 242 in the first direction x.

[0107] In some embodiments, the support structure 244 can be a long rod structure, with the length direction of the long rod structure set along the first direction x, so that the long rod structure can pass through multiple conductive structures 242 in sequence, and the probability of forming an adhesion between two adjacent first membrane layers 241a is lower, and the multiple conductive structures 242 can be connected through the impregnation channel 245 formed by the support structure 244.

[0108] With this configuration, at least one conductive structure 242 located on one of the two adjacent first membrane layers 241a can be connected to at least one adjacent conductive structure 242 located on the other layer through the wetting channel 245. This can effectively improve the efficiency of electrolyte penetration between the multilayer stacked insulating membrane layers 241, thereby improving the wetting effect of the internal electrode assembly 23.

[0109] Please refer to Figure 5 and Figure 9 In some embodiments, there are multiple support structures 244 between any two adjacent conductive structures 242 arranged in the first direction x, and the multiple support structures 244 are arranged at intervals along the second direction y; wherein, the second direction y is perpendicular to both the first direction x and the thickness direction z of the first membrane layer 241a.

[0110] In this embodiment, in the first direction x, the number of support structures 244 between any two adjacent conductive structures 242 can be multiple, for example, two, three or more.

[0111] Multiple support structures 244 are arranged sequentially at intervals along the second direction y; thus, the multiple support structures 244 can be used together to support adjacent first membrane layers 241a, thereby further reducing the probability of adhesion between adjacent first membrane layers 241a. At the same time, the multiple support structures 244 can form more wetting channels 245 or larger wetting channels 245 between adjacent first membrane layers 241a; thus, the permeation efficiency of electrolyte between adjacent first membrane layers 241a can be further improved.

[0112] With this configuration, multiple support structures 244 are used to support and form multiple wetting channels 245 between two adjacent first membrane layers 241a, so as to further improve the penetration efficiency of the electrolyte, thereby further improving the wetting rate and wetting effect of the electrode assembly 23.

[0113] Please refer to Figures 6 to 8 In some embodiments, the support structure 244 is a cylindrical structure, and the axial direction of the cylindrical structure is parallel to the first direction x.

[0114] In this embodiment, the support structure 244 can be configured as a cylindrical structure, and the axial direction of the cylindrical structure is set to be parallel to the first direction x. In this way, the arc-shaped peripheral wall of the cylindrical structure forms contact with the first membrane layer 241a. Compared with block structures, rod structures and other structures with edges, the peripheral wall of the cylindrical structure causes less damage to the first membrane layer 241a when it contacts the first membrane layer 241a, thereby effectively improving the reliability and service life of the first membrane layer 241a.

[0115] Please refer to Figures 6 to 8 In some embodiments, the support structure 244 is a solid structure; or, the support structure 244 is a hollow structure.

[0116] In this embodiment, the support structure 244 can be a solid structure; thus, the solid support structure 244 has better structural strength, thereby improving the service life of the support structure 244.

[0117] Alternatively, the support structure 244 can be a hollow structure; for example, the support structure 244 can be a hollow cylindrical structure. In this way, the support structure 244 with a hollow structure is lighter, thus reducing the impact of the support structure 244 on the overall weight of the battery cell 20.

[0118] Please refer to Figure 4 , Figure 5 and Figure 10 In some embodiments, the outer casing 210 further includes a sidewall 221b, which is connected to and intersects with the bottom wall 221a; a clearance groove 221c is formed at the angle between the bottom wall 221a and the sidewall 221b; the insulating film layer 241 further includes a second film layer 241b, which is disposed between the electrode assembly 23 and the sidewall 221b, and is connected to the first film layer 241a, with a corner 241c formed between the first film layer 241a and the second film layer 241b; the corner 241c is accommodated within the clearance groove 221c.

[0119] Here, sidewall 221b refers to the wall surface of the outer shell facing the receiving cavity 221 and intersecting with the bottom wall. In some embodiments, sidewall 221b is the peripheral sidewall of the receiving cavity 221.

[0120] Understandably, when the electrode assembly 23 is manufactured using a winding process, the electrode assembly 23 will form a flat structure. Accordingly, corresponding to the structural characteristics of the flat structure of the electrode assembly 23, the peripheral sidewall of the outer shell 210 will form two relatively large surfaces to correspond to the relatively large areas of the flat structure of the electrode assembly 23 on both sides, while the other two narrower surfaces of the peripheral sidewall of the outer shell 210 correspond to the relatively narrower opposite ends of the electrode assembly 23.

[0121] In some embodiments, the sidewall 221b mentioned above may refer to the wall surface where the large surface of the outer shell 210 is located; or, the sidewall 221b mentioned above may refer to the wall surface where the narrow surface of the outer shell 210 is located. In this embodiment, the sidewall 221b can be exemplified as the narrow surface of the peripheral sidewall of the outer shell 210 with the narrower side.

[0122] An avoidance groove 221c is provided at the angle between the bottom wall 221a and the side wall 221b; that is, the wall thickness of the bottom wall 221a and the side wall 221b is smaller at the angle, so that a recessed avoidance groove 221c can be formed.

[0123] The insulating film layer 241 also includes a second film layer 241b; wherein, the second film layer 241b refers to the part of the insulating film layer 241 located between the electrode assembly 23 and the sidewall 221b, that is, the second film layer 241b surrounds the electrode assembly 23 and forms an insulating protection, and the first film layer 241a covers the bottom of the second film layer 241b and covers the electrode assembly 23 to form an insulating protection.

[0124] It should be understood that a corner 241c will be formed between the first membrane layer 241a and the second membrane layer 241b, that is, a corner 241c will be formed at the connection between the first membrane layer 241a and the second membrane layer 241b due to bending. When the included angle between the bottom wall 221a and the side wall 221b is small, the corner 241c may interfere with the included angle, thereby affecting the assembly of the insulating component 24.

[0125] With this configuration, by creating an avoidance groove 221c at the angle between the bottom wall 221a and the side wall 221b to avoid and accommodate the corner 241c formed between the first membrane layer 241a and the second membrane layer 241b, the influence of the inner surface of the receiving cavity 221 on the corner 241c formed by the insulating member 24 can be effectively reduced.

[0126] The battery cell 20 provided in this application will now be further described according to specific embodiments.

[0127] Please refer to Figures 4 to 9 In this embodiment, the battery cell 20 includes a housing 210, an electrode assembly 23, and an insulating component 24. The housing 210 includes a shell 22 and an end cap 21. The shell 22 is provided with a receiving cavity 221 having an opening 22a. The end cap 21 covers the opening 22a, and the electrode assembly 23 is housed in the receiving cavity 221.

[0128] An insulating member 24 is disposed between the housing 22 and the electrode assembly 23 for covering the electrode assembly 23. The insulating member 24 includes at least two overlapping insulating film layers 241 and an adhesive layer 243 disposed between adjacent insulating film layers 241; in this embodiment, the insulating member 24 is illustrated by example as including two insulating film layers 241.

[0129] Each insulating film layer 241 includes a first film layer 241a, which is located on the side of the electrode assembly 23 opposite to the end cap 21. The first film layer 241a includes a permeation region 241a1, and multiple conductive structures 242 are formed on the permeation region 241a1. In the thickness direction z of the first film layer 241a, the projections of the conductive structures 242 on adjacent first film layers 241a are staggered. Simultaneously, the adhesive layer 243 is provided with a clearance opening 243a, and in the thickness direction z of the first film layer 241a, the projection of the clearance opening 243a includes the projection of the permeation region 241a1.

[0130] The insulating element 24 also includes a support structure 244, for example, the support structure 244 can be a cylindrical structure; the support structure 244 is disposed between two adjacent first film layers 241a and is used to form an impregnation channel 245 between the two adjacent first film layers 241a. Multiple conductive structures 242 formed on each first film layer 241a are sequentially spaced along a first direction x, wherein the first direction x is perpendicular to the thickness direction z of the first film layer 241a; in the first direction x, the conductive structures 242 formed on adjacent first film layers 241a are arranged alternately; and in the first direction x, a support structure 244 is disposed between any conductive structure 242 formed on one of the two adjacent first film layers 241a and an adjacent conductive structure 242 formed on the other layer.

[0131] In this way, the electrolyte can permeate through the permeation regions 241a1 of each first membrane layer 241a, and through the conductive structures 242 formed on the permeation regions 241a1, to achieve a more efficient permeation operation. At the same time, the provision of the support structure 244 can further improve the flow and permeation efficiency of the electrolyte between adjacent first membrane layers 241a. Thus, even when the first membrane layers 241a of the insulating member 24 are subjected to the gravity of the electrode assembly 23, the electrolyte can still quickly permeate and wet the internal electrode assembly 23.

[0132] Please refer to Figure 2 and Figure 3 This application also provides a battery device 100, including a battery cell 20 as described above.

[0133] The battery device 100 provided in this application embodiment includes the aforementioned battery cell 20. When the electrode assembly 23 of the aforementioned battery cell 20 can be sufficiently wetted, the stability of the battery cell 20 is better, thereby the stability of the battery device 100 is also better.

[0134] Please refer to Figure 2 , Figure 3 and Figure 11This application also provides an energy storage device 2000, including a battery cell 20 as described above or a battery device 100 as described above, wherein the battery cell 20 or the battery device 100 is used to store or provide electrical energy.

[0135] This application provides an energy storage device 2000, including one or more battery clusters to increase the voltage and capacity of the energy storage device 2000. The battery clusters may include multiple battery devices 100, which are connected in series via a busbar to increase the voltage of the energy storage device 2000. When the energy storage device 2000 includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device 2000.

[0136] The energy storage device 2000 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device 2000 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 2000 can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours. The energy storage system provided in this application embodiment can be any power system that requires the energy storage device 2000.

[0137] In some embodiments, the energy storage device 2000 is an energy storage container or an energy storage cabinet.

[0138] In some embodiments, the energy storage device 2000 may include a cabinet and one or more battery clusters housed in the cabinet.

[0139] In some embodiments, the energy storage device 2000 may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0140] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 100 via piping to regulate the temperature of the individual battery cells 20.

[0141] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes auxiliary battery management units, integrated switches, and other modules.

[0142] As an example, the central control module can serve as the battery management unit of the energy storage device 2000, used for monitoring and managing the energy storage device 2000. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device 2000. For example, it can control the charging and discharging current and voltage of the energy storage device 2000. As an example, the central control module includes modules such as an insulation monitoring module, a main battery management unit, and an Ethernet and fiber optic conversion module.

[0143] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in the energy storage system.

[0144] As an example, the power distribution module can be used to distribute power to modules in the energy storage device 2000 that require electricity.

[0145] The energy storage device 2000 provided in this application embodiment has better stability than the above-mentioned battery cell 20 or battery device 100.

[0146] Please refer to Figures 1 to 3 as well as Figure 11 This application also provides an electrical device, including a battery cell 20 as described above, or a battery device 100 as described above, or an energy storage device 2000 as described above, wherein the battery cell 20 or the battery device 100 is used to store or provide electrical energy.

[0147] The electrical device provided in this application embodiment has better stability, based on at least one of the battery cell 20 as described above or the battery device 100 and energy storage device 2000 as described above.

[0148] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A single battery cell, characterized in that: include The outer shell has an internal cavity and a bottom wall. The electrode assembly is housed within the receiving cavity; as well as An insulating element is disposed between the housing and the electrode assembly for covering the electrode assembly; the insulating element includes at least two stacked insulating film layers; the insulating film layer includes a first film layer, which is located between the bottom wall and the electrode assembly; In this embodiment, each of the insulating film layers has a conductive structure extending through the thickness direction of the first film layer on its first film layer. In the thickness direction of the first film layer, the projections of the conductive structures on adjacent first film layers are staggered.

2. The battery cell according to claim 1, characterized in that: The insulating component further includes an adhesive layer, and any two adjacent insulating film layers are connected by the adhesive layer, with a clearance opening provided on the adhesive layer; the first film layer includes a permeation region, and the conductive structure is disposed within the permeation region; in the same projection plane perpendicular to the thickness direction of the first film layer, the orthographic projection of the clearance opening covers the orthographic projection of the permeation region.

3. The battery cell according to claim 2, characterized in that: The area of ​​the permeation region is m, and the area of ​​the first membrane layer is n; wherein, 0.15≤m / n≤0.

7.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The conductive structure is a through hole; or, the conductive structure is a cut.

5. The battery cell according to any one of claims 1 to 3, characterized in that: The insulating component further includes a support structure disposed between two adjacent layers of the first film and used to form an impregnation channel between the two adjacent layers of the first film, the impregnation channel being connected to the conductive structure formed on the two adjacent layers of the first film.

6. The battery cell according to claim 5, characterized in that: Multiple conductive structures are formed on each of the first membrane layers, and the multiple conductive structures are distributed sequentially at intervals along a first direction, wherein the first direction is perpendicular to the thickness direction of the first membrane layer. In the first direction, the conductive structures formed on two adjacent layers of the first membrane are arranged alternately; and in the first direction, a support structure is provided between any conductive structure formed on one of the two adjacent layers of the first membrane and an adjacent conductive structure formed on the other layer.

7. The battery cell according to claim 5, characterized in that: Multiple conductive structures are formed on each of the first membrane layers, and the multiple conductive structures are distributed sequentially at intervals along a first direction, wherein the first direction is perpendicular to the thickness direction of the first membrane layer. In the first direction, the conductive structures formed on two adjacent layers of the first membrane are arranged alternately; the support structure extends along the first direction to form a plurality of wetting channels, and each of the wetting channels is sequentially connected to a plurality of the conductive structures.

8. The battery cell according to claim 6 or 7, characterized in that: The number of support structures between any two adjacent conductive structures in the first direction is multiple, and the multiple support structures are arranged at intervals along the second direction; wherein, the second direction is perpendicular to both the first direction and the thickness direction of the first membrane layer.

9. The battery cell according to claim 6 or 7, characterized in that: The supporting structure is a cylindrical structure, and the axial direction of the cylindrical structure is parallel to the first direction.

10. The battery cell according to claim 5, characterized in that: The supporting structure is a solid structure; or, the supporting structure is a hollow structure.

11. The battery cell according to any one of claims 1 to 3, characterized in that: The outer casing also includes a side wall, which is connected to the bottom wall and intersects with the bottom wall; a clearance groove is provided at the angle between the bottom wall and the side wall; The insulating film layer further includes a second film layer, which is disposed between the electrode assembly and the sidewall. The second film layer is connected to the first film layer, and a corner is formed between the first film layer and the second film layer; the corner is accommodated in the clearance groove.

12. A battery device, characterized in that: Includes the battery cell as described in any one of claims 1 to 11.

13. An energy storage device, characterized in that: Includes a battery cell as described in any one of claims 1 to 11 or a battery device as described in claim 12, wherein the battery cell or the battery device is used to store or provide electrical energy.

14. An electrical appliance, characterized in that: Includes a battery cell as described in any one of claims 1 to 11, a battery device as described in claim 12, or an energy storage device as described in claim 13, wherein the battery cell or the battery device is used to store or provide electrical energy.

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