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

Abstract

The utility model provides a single battery, a battery device, an energy storage device, an energy storage system and a charging network, the single battery comprises a shell, an electrode assembly, a separator, a blocking member and a pressure relief mechanism, the shell is provided with a containing cavity and a first wall, and the first wall is arranged on one side of the containing cavity in a surrounding mode in the thickness direction of the first wall; the isolation piece is arranged on the side, facing the electrode assembly, of the first wall, a pressure relief channel communicated with the containing cavity is formed between the isolation piece and the first wall, the blocking component is arranged on the pressure relief channel and comprises a connecting shaft and a plurality of blocking pieces connected with the connecting shaft, the axis direction of the connecting shaft intersects with the thickness direction, and a gap is formed between every two adjacent blocking pieces; the blocking part rotates by taking the axis of the connecting shaft as a rotating center when the single battery body is subjected to pressure relief through the pressure relief channel, a pressure relief mechanism is arranged on one side, facing and / or deviating from the electrode assembly, of the blocking part, and the pressure relief mechanism is communicated with the pressure relief channel when the single battery body is subjected to pressure relief through the pressure relief channel; and the reliability of the battery monomer under an extreme condition can be improved.

Description

Battery cells, battery packs, energy storage devices, energy storage systems and charging networks Technical Field

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

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, among others.

[0003] In the development of battery technology, how to improve the reliability of individual battery cells under extreme conditions is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] In view of the above problems, this application provides a battery cell, a battery device, an energy storage device, an energy storage system, and a charging network, which helps to improve the reliability of the battery cell under extreme conditions.

[0005] In a first aspect, this application provides a battery cell, comprising: a housing having a receiving cavity and a first wall, the first wall surrounding one side of the receiving cavity along its thickness direction; an electrode assembly housed in the receiving cavity; a separator disposed along its thickness direction on the side of the first wall facing the electrode assembly, a pressure relief channel forming between the separator and the first wall, the pressure relief channel communicating with the receiving cavity; a blocking member disposed in the pressure relief channel, the blocking member including a connecting shaft and a plurality of blocking members, the axial direction of the connecting shaft intersecting the thickness direction, the plurality of blocking members being connected to the connecting shaft, a gap being present between adjacent blocking members, the blocking members being configured to rotate about the axis of the connecting shaft as a rotation center when the battery cell is depressurized through the pressure relief channel; and a pressure relief mechanism, the blocking member having a pressure relief mechanism disposed on the side facing and / or away from the electrode assembly, the pressure relief mechanism being used to communicate with the pressure relief channel when the battery cell is depressurized through the pressure relief channel.

[0006] In some embodiments of the first aspect, by providing a blocking member in the pressure relief channel connected to the pressure relief mechanism, when a battery cell experiences thermal runaway, the high-temperature gas inside the battery cell carries solid matter towards the pressure relief channel. The blocking member in the blocking member begins to rotate around the axis of the connecting shaft under the drive of the high-temperature gas. The high-temperature gas can flow through the gap between the blocking members from the pressure relief channel to the outside of the battery cell, while the solid matter is knocked off by the rotating blocking member or adheres to the surface of the blocking member and is thrown off under the action of centrifugal force. This effectively reduces the possibility of solid matter being discharged to the outside of the battery cell, thereby helping to avoid the solid matter igniting the external oxygen and the flue gas generated by the combination of the released high-temperature gas. This further helps to reduce the impact of thermal runaway on the battery cell, thereby improving the reliability of the battery cell under extreme conditions. Furthermore, by setting the axial direction of the connecting shaft to intersect with the thickness direction, it is beneficial to reduce the obstruction of the blocking member to the flow of high-pressure gas, thereby improving the efficiency of rapid release of high-pressure gas inside the battery cell when thermal runaway occurs.

[0007] In some embodiments, the axial direction of the connecting shaft is perpendicular to the thickness direction; or, the axial direction of the connecting shaft is set at an acute angle to the thickness direction, and the angle between the blocking member and the direction perpendicular to the thickness direction is between 30° and 50°.

[0008] In the above technical solution, the connecting shaft can be arranged in multiple positions, which is beneficial to improving the diversity of blocking components, thereby improving the diversity of battery cells.

[0009] In some embodiments, the bottom wall of the pressure relief channel surrounds the side of the blocking member facing the electrode assembly along the thickness direction, the side wall of the pressure relief channel surrounds the periphery of the blocking member, the bottom wall is connected to the side wall, the bottom wall is a closed structure, and the side wall is provided with a through hole that connects the receiving cavity and the pressure relief channel.

[0010] In the above technical solution, since the flow of gas is better than that of solid matter, the high-temperature gas can change its flow direction and flow into the pressure relief channel through the through hole in the side wall, while some of the solid matter will be blocked by the bottom wall, which helps to further reduce the possibility of solid matter being discharged to the outside of the battery cell.

[0011] In some embodiments, the sidewall includes two first sidewalls spaced apart along a first direction and two second sidewalls spaced apart along a second direction, the first sidewalls and the second sidewalls being alternately connected, the blocking member having a windward surface on one side along its own thickness direction, the first direction, the second direction and the thickness direction intersecting each other; at least one first sidewall is provided with a through hole, and in the same projection plane perpendicular to the first direction, the orthographic projection of the through hole at least partially overlaps with the orthographic projection of the windward surface, and / or, at least one second sidewall is provided with a through hole, and in the same projection plane perpendicular to the first direction, the orthographic projection of the through hole at least partially overlaps with the orthographic projection of the windward surface.

[0012] With the above configuration, the high-pressure gas entering the pressure relief channel through the through hole can directly impact the windward surface, so that the gas pressure can be directly converted into the rotational torque of the blocking component, thereby driving the blocking component to rotate quickly, shortening the response time of the blocking component to thermal runaway, and thus improving the pressure relief efficiency of the battery cell.

[0013] In some embodiments, the sidewall and the bottom wall are set at an obtuse angle, and the angle between the sidewall and the direction perpendicular to the thickness direction is between 120° and 150°.

[0014] In the above technical solution, by setting the side wall and bottom wall at an obtuse angle, the angle between the side wall and the direction perpendicular to the thickness direction is set within the above range. The layout is reasonable, which not only facilitates the assembly of the blocking components in the pressure relief channel, but also reduces the impact on the space utilization of the battery cell. In addition, it is also conducive to optimizing the flow path of high-pressure gas in the pressure relief channel.

[0015] In some embodiments, the battery cell further includes a bracket, which is disposed in the pressure relief channel and connected to the bottom wall, and a connecting shaft is connected to the bracket.

[0016] In the above technical solution, the blocking component can be fixed in the pressure relief channel by the bracket. When the high-pressure gas impacts the blocking component, the rotational torque will be transmitted to the bracket through the connecting shaft. The bracket can provide a certain buffer force for the blocking component to reduce the possibility of stress concentration on the connecting shaft, which may lead to bending or breakage. In addition, the bracket can also isolate the direct contact between the connecting shaft and the bottom wall, which is beneficial to reducing the impact of vibration, collision or heat generation of the battery cell on the connecting shaft during operation, thereby improving the reliability of the blocking component's rotation around the connecting shaft.

[0017] In some embodiments, the support includes a first frame and a second frame that are intersecting, the second frame being located between a side wall and the first frame. The first frame has a first end and a second end that are oppositely disposed, and the second frame has a third end and a fourth end that are oppositely disposed. The first end is connected to the bottom wall, the second end is connected to the third end, and the fourth end is connected to the bottom wall. The first frame is connected to a connecting shaft, and the angle between the first frame and a direction perpendicular to the thickness direction is between 30° and 60°. And / or, the second frame is connected to a connecting shaft, and the angle between the second frame and a direction perpendicular to the thickness direction is between 30° and 60°.

[0018] In the above technical solution, by setting the bracket as an intersecting structure including a first frame and a second frame, and fixing the two ends of the first frame and the second frame to the bottom wall respectively, the bracket can form a stable triangular structure, which is beneficial to improving the support effect of the bracket on the blocking components and also beneficial to reducing the space occupied by the bracket.

[0019] In some embodiments, there are multiple pressure relief channels, each pressure relief channel is provided with a blocking member; and / or, there are two blocking members in the pressure relief channel, the two blocking members are spaced apart along a first direction, and the two blocking members are symmetrically arranged with an axis extending along the thickness direction, the first direction intersecting the thickness direction.

[0020] The above-mentioned configuration helps to improve the pressure relief efficiency of the battery cell. Furthermore, by setting the number of blocking components to multiple, the blocking effect of the blocking components on solid materials can be further improved, thereby further reducing the possibility of solid materials being emitted to the outside of the battery cell. This helps to prevent solid materials from igniting the smoke generated by the combination of external oxygen and the released high-temperature gas, which in turn helps to reduce the impact of thermal runaway on the battery cell and improve the reliability of the battery cell under extreme conditions.

[0021] In some embodiments, the included angle between two adjacent blocking members is between 15° and 90°.

[0022] In the above technical solution, by setting the included angle between two adjacent blocking members within the above range, it is possible to improve the blocking effect of the blocking member on solid materials and also to simplify the structure of the blocking member.

[0023] In some embodiments, the shape of the blocking member includes at least one of quadrilateral and sector. This arrangement facilitates greater diversity in blocking members, which in turn facilitates greater diversity in battery cells.

[0024] In some embodiments, the spacer has a first surface facing the first wall and a second surface facing away from the first wall. The spacer has a recessed portion along the direction from the first surface to the second surface, forming a pressure relief channel between the recessed portion and the first wall. The first wall has a pressure relief mechanism. And / or, the housing includes a shell and an end cap, the shell having an opening, the end cap closing onto the opening, and the end cap including the first wall. This configuration facilitates manufacturing and reduces processing difficulty.

[0025] In a second aspect, this application provides a battery device including a plurality of battery cells provided according to any embodiment of the first aspect.

[0026] Thirdly, this application provides an energy storage device, including a plurality of battery cells provided according to any embodiment of the first aspect or a plurality of battery devices provided according to any embodiment of the second aspect, wherein the battery cells or battery devices are used to store electrical energy or provide electrical energy.

[0027] Fourthly, this application provides an energy storage system, including a power conversion device and an energy storage device as provided in any embodiment of the third aspect, wherein the power conversion device is used to electrically connect a power generation device and an energy storage device.

[0028] Fifthly, this application provides a charging network, including a charging pile and an energy storage device as provided in any embodiment of the third aspect or an energy storage system as provided in any embodiment of the fourth aspect, wherein the energy storage device is used to provide electrical energy to the charging pile.

[0029] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application 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 the drawings without creative effort.

[0031] Figure 1 is a schematic diagram of the structure of a charging network in some embodiments of this application;

[0032] Figure 2 is a schematic diagram of the structure of an energy storage system according to some embodiments of this application;

[0033] Figure 3 is a schematic diagram of the structure of an energy storage device in some embodiments of this application;

[0034] Figure 4 is a schematic diagram of the structure of a battery cell assembly provided in some embodiments of this application;

[0035] Figure 5 is an exploded structural diagram of a battery device provided in some embodiments of this application;

[0036] Figure 6 is a schematic diagram of the exploded structure of a single battery cell provided in some embodiments of this application;

[0037] Figure 7 is a schematic diagram of a partial explosion structure of a battery cell provided in some embodiments of this application;

[0038] Figure 8 is a partial structural schematic diagram of a battery cell provided in some embodiments of this application;

[0039] Figure 9 is a partial structural schematic diagram of a battery cell provided in some other embodiments of this application.

[0040] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0041] 1000, Charging network; 2000, Energy storage system; 3000, Power generation device;

[0042] 200. Energy storage device; 210. Energy storage container; 300. Charging pile; 400. Energy storage converter;

[0043] 100. Battery device; 4. Battery cell assembly;

[0044] 1. Battery cell; 2. Housing; 201. First housing; 202. Second housing;

[0045] 10. Outer shell; 101. Receiving cavity; 110. Shell; 1101. Opening; 120. End cap; 11. First wall; 102. Pressure relief channel; 1021. Bottom wall; 1022. Side wall; 103. Through hole; 1023. First side wall; 1024. Second side wall;

[0046] 20. Electrode assembly; 30. Spacer; 301. First surface; 302. Second surface; 31. Recess;

[0047] 40. Pressure relief mechanism; 50. Blocking component; 51. Connecting shaft; 52. Blocking element; 501. Clearance; 502. Windward side; 503. Leeward side;

[0048] 60. Support; 61. First frame; 611. First end; 612. Second end; 62. Second frame; 621. Third end; 622. Fourth end; 70. Electrode terminal;

[0049] X, thickness direction; Y, first direction; Z, second direction. Detailed Implementation

[0050] 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.

[0051] 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.

[0052] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] In this application, "multiple" means two or more (including two).

[0057] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power 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 aerospace and other fields. With the continuous expansion of the application areas of battery devices, the market demand is also constantly increasing.

[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] A pressure relief mechanism is a component or part that is activated when the internal pressure of a battery cell reaches a predetermined threshold to release the internal pressure. The pressure relief mechanism on a battery cell has a significant impact on the reliability of the battery cell. For example, when a short circuit or overcharging occurs, thermal runaway may occur inside the battery cell, causing a sudden increase in pressure. In such extreme cases, the activation of the pressure relief mechanism can release the internal pressure to the outside, thereby preventing the battery cell from exploding or catching fire.

[0061] When a battery cell malfunctions in the relevant technology, the high-temperature gases and other emissions inside it will be discharged through the explosion-proof valve to release the internal pressure. However, during the depressurization process, solid materials inside the battery cell will also be discharged to the outside of the battery cell. These materials are prone to react with external oxygen and the newly discharged high-temperature gases, which may lead to safety problems such as fire.

[0062] Based on the above-mentioned technical problems, this application provides a battery cell, including a housing, an electrode assembly, a blocking member, and a pressure relief mechanism. The housing has a receiving cavity and a first wall. Along the thickness direction of the first wall, the first wall surrounds one side of the receiving cavity. The electrode assembly is received in the receiving cavity. Along the thickness direction, a spacer is disposed on the side of the first wall facing the electrode assembly, forming a pressure relief channel between the spacer and the first wall. The pressure relief channel communicates with the receiving cavity. The blocking member is disposed in the pressure relief channel. The blocking member includes a connecting shaft and multiple blocking members. The axial direction of the connecting shaft intersects the thickness direction. The multiple blocking members are all connected to the connecting shaft. There is a gap between two adjacent blocking members. The blocking members are configured to rotate about the axis of the connecting shaft as the rotation center when the battery cell is depressurized through the pressure relief channel. The blocking member is provided with a pressure relief mechanism on the side facing and / or away from the electrode assembly. The pressure relief mechanism is used to communicate with the pressure relief channel when the battery cell is depressurized through the pressure relief channel.

[0063] By installing a blocking component within the pressure relief channel connected to the pressure relief mechanism, when a battery cell experiences thermal runaway, the high-temperature gas inside the battery cell carries solid matter towards the pressure relief channel. Driven by the high-temperature gas, the blocking component in the blocking mechanism begins to rotate around the axis of the connecting shaft. The high-temperature gas can flow through the gaps between the blocking components into the pressure relief channel to the outside of the battery cell, while the solid matter is knocked off by the rotating blocking component or adheres to the surface of the blocking component and is thrown off under the action of centrifugal force. This effectively reduces the possibility of solid matter being emitted to the outside of the battery cell, thereby preventing the solid matter from igniting the external oxygen and the flue gas generated by the combination of the released high-temperature gas. This further helps to reduce the impact of thermal runaway on the battery cell and improve the reliability of the battery cell under extreme conditions. Furthermore, by setting the axial direction of the connecting shaft to intersect with the thickness direction, it is beneficial to reduce the obstruction of the high-pressure gas flow by the blocking component, thereby improving the efficiency of rapid release of internal pressure when thermal runaway occurs.

[0064] The technical solutions described in the embodiments of this application are applicable to various battery devices or electrical equipment that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0065] The technical solutions described in the embodiments of this application are applicable to various battery devices, energy storage containers, energy storage cabinets, and other energy storage devices that use individual battery cells.

[0066] Please refer to Figures 1, 3, and 6. Figure 1 is a structural schematic diagram of a charging network 1000 provided in some embodiments of this application. Figure 3 is a structural schematic diagram of an energy storage device 200 provided in some embodiments of this application. Figure 6 is an exploded structural schematic diagram of a battery cell 1 provided in some embodiments of this application. This application provides a charging network 1000, which includes a charging pile 300 for charging electrical equipment. The charging network 1000 may also include an energy storage device 200, which is electrically connected to the charging pile 300 and provides electrical energy to the charging pile 300.

[0067] It should be noted that the charging pile 300 and the battery cell 1 in the energy storage device 200 are electrically connected via cables. The battery cell 1 can supply its stored electrical energy to the charging pile 300. The charging pile 300 has a connector that can be connected to electrical equipment, thereby replenishing the equipment's energy. The application of the energy storage device 200 in this charging network 1000 can effectively improve the safety of the charging network 1000 and also help to improve the flexibility of the charging network 1000 during deployment.

[0068] In a charging network 1000, there can be one charging pile 300, and the energy storage device 200 provides power to the one charging pile 300; there can also be multiple charging piles 300, and the energy storage device 200 provides power to multiple charging piles 300.

[0069] As an example, as shown in Figure 1, the charging network 1000 includes an energy storage device 200 and two charging piles 300, with the energy storage device 200 providing power to the two charging piles 300.

[0070] As shown in Figure 3, the energy storage device 200 may include a battery device 100, which is electrically connected to the charging pile 300 so that the battery device 100 can provide power to the charging pile 300.

[0071] Please refer to Figures 2 and 3. Figure 2 is a schematic diagram of the structure of an energy storage system 2000 provided in some embodiments of this application. This application provides an energy storage system 2000. The energy storage system 2000 includes an energy storage converter 400, which can be electrically connected to a generator 3000 to convert the electrical power provided by the generator 3000. The energy storage system 2000 may also include an energy storage device 200, which is electrically connected to the energy storage converter 400. The energy storage converter 400 converts the electrical energy provided by the generator 3000 and stores it in the energy storage device 200.

[0072] A power conversion device is used to connect the power generation device 3000 and the energy storage device 200. The power generation device 3000 generates electrical energy and stores it in the energy storage device 200 via the power conversion device. The use of the energy storage device 200 in the energy storage system 2000 effectively improves its operational safety. In specific implementations, the power generation equipment can be solar panels, hydroelectric power generation equipment, thermal power generation equipment, etc. This application does not limit the specific type of power generation equipment.

[0073] As an example, as shown in Figure 2, the energy storage system 2000 includes an energy storage device 200 and an energy storage converter 400. The two power generation devices 3000 respectively transmit the generated electrical energy to the energy storage converter 400, and the energy storage converter 400 introduces the electrical energy into the energy storage device 200 for storage.

[0074] As shown in Figure 3, the energy storage device 200 includes an energy storage box 210, and a battery device 100 is installed inside the energy storage box 210.

[0075] As an example, the energy storage device 200 can be an energy storage container, an energy storage cabinet, etc.

[0076] As an example, energy storage device 200 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage power stations can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. Wind power generation systems collect wind energy from wind turbines, convert it into electrical energy, and store it in energy storage device 200. Solar power generation systems can convert solar energy into electrical energy, store it in energy storage device 200, and supply it to users as needed. Mobile power systems can supply power to relevant electrical equipment in areas where the mains power supply cannot reach, such as remote mountainous areas and remote wilderness areas. Temporary power supply systems can provide power to users when there is insufficient power supply.

[0077] Please refer to Figure 4, which is a schematic diagram of the structure of a battery cell assembly 4 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 4 for providing voltage and capacity. The battery cell assembly 4 may include multiple battery cells 1, which are connected in series, parallel, or mixed connection through a busbar component.

[0078] In some embodiments, the battery cell assembly 4 is typically formed by arranging multiple battery cells 1.

[0079] Please refer to Figure 5, which is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. In some embodiments, the battery device 100 can be a battery pack, which includes a housing 2 and one or more battery cell assemblies 4, the battery cell assemblies 4 being housed in the housing 2.

[0080] As an example, the battery cell assembly 4 can be a battery module, and the battery cell assembly 4 can be housed in the housing 2 by fixing the battery module in the housing 2.

[0081] As an example, the battery cell assembly 4 can also be housed in the housing 2 by directly fixing multiple battery cells 1 to the housing 2.

[0082] As an example, the housing 2 may include a first housing 201 and a second housing 202. The first housing 201 and the second housing 202 are fastened together to form an accommodating space, thereby creating a closed space inside the housing 2 to accommodate the battery cell assembly 4. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first housing 201 may be a top cover or a bottom plate.

[0083] As an example, the housing 2 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 2 forms an enclosed space to accommodate the battery cell assembly 4.

[0084] The box 2 can be a simple three-dimensional structure such as a cuboid or a cylinder, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids or cylinders. This application embodiment does not limit this.

[0085] Specifically, the housing 2 can be a metal shell made of alloy steel, alloy aluminum, etc., or a composite material shell made of metal and polypropylene, etc.

[0086] As an example, the battery cell assembly 4 can be a battery module, which is formed by arranging and fixing multiple battery cells 1 together to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 1 together with cable ties.

[0087] Please refer to Figure 6. The battery cell 1 includes a housing 10 and an electrode assembly 20.

[0088] The outer casing 10 is a component used to form the internal environment of the battery cell 1. The outer casing 10 has a receiving cavity 101, which can be used to accommodate the electrode assembly 20, as well as the electrolyte and other components. Optionally, the outer casing 10 can be, but is not limited to, made of metallic or non-metallic materials. For example, metallic materials can be copper, aluminum, or stainless steel; non-metallic materials can be polyethylene, polypropylene, or polyvinyl chloride.

[0089] For example, the outer shell 10 can be a steel shell, an aluminum shell, a plastic shell (such as a polypropylene shell), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0090] In some embodiments, the housing 10 can be a sealed structure or a non-sealed structure. As an example, when the housing 10 is a non-sealed structure, it serves to protect the electrode assembly 20, and a sealing bag is included between the housing 10 and the electrode assembly 20 to encapsulate the electrode assembly 20 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the housing 10 is a sealed structure, it is used to encapsulate the electrode assembly 20 and the electrolyte, among other components.

[0091] In some embodiments, the housing 10 includes an end cap 120 and a housing 110. The housing 110 has a receiving cavity 101 and an opening 1101 communicating with the receiving cavity 101. The end cap 120 covers the opening 1101. The housing 110 may have one or more openings 1101. The end cap 120 may also be provided one or more.

[0092] The shape of the outer shell 10 can be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is a cuboid structure, a cuboid outer shell can be selected; if the electrode assembly 20 is a cylindrical structure, a cylindrical outer shell can be selected.

[0093] Electrode assembly 20 is a component in the battery cell 1 in which an electrochemical reaction occurs, and the housing 110 may contain one or more electrode assemblies 20.

[0094] In some embodiments, the electrode assembly 20 may be cylindrical, flat, or polygonal in shape.

[0095] The electrode assembly 20 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0096] The electrode assembly 20 includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell 1, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0097] Please refer to Figure 6. The battery cell 1 also includes a pressure relief mechanism 40. The pressure relief mechanism 40 is used to release the internal gas of the battery cell 1. The pressure relief mechanism 40 may be located on the outer casing 10.

[0098] As an example, the internal pressure or temperature of battery cell 1 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of battery cell 1 reaches the predetermined threshold, the pressure relief mechanism 40 is activated or a weak structure provided in the pressure relief mechanism 40 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in battery cell 1.

[0099] The term "actuation" as used in this application refers to the pressure relief mechanism 40 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 1. The actions of the pressure relief mechanism 40 may include, but are not limited to: movement of components within the pressure relief mechanism 40 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 40, etc. When the pressure relief mechanism 40 is actuated, the high-temperature, high-pressure substances inside the battery cell 1 are discharged outwards from the actuated portion as waste. This method enables pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0100] The emissions from battery cell 1 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.

[0101] As shown in Figure 6, in some embodiments, the battery cell 1 is further provided with two electrode terminals 70, which are used to electrically connect with the electrode assembly 20 for outputting or inputting electrical energy of the battery cell 1. Exemplarily, both electrode terminals 70 are disposed on the first wall 11, and the pressure relief mechanism 40 is disposed between the two electrode terminals 70.

[0102] Please refer to Figures 6 to 9 together. Figure 7 is a partial exploded structural diagram of a battery cell 1 provided in some embodiments of this application. Figure 8 is a partial structural diagram of a battery cell 1 provided in some embodiments of this application. Figure 9 is a partial structural diagram of a battery cell 1 provided in other embodiments of this application.

[0103] According to an embodiment of this application, a battery cell 1 is provided, including a housing 10, an electrode assembly 20, a separator 30, a blocking member 50, and a pressure relief mechanism 40. The housing 10 has a receiving cavity 101 and a first wall 11. Along the thickness direction X of the first wall 11, the first wall 11 surrounds one side of the receiving cavity 101. The electrode assembly 20 is received in the receiving cavity 101. Along the thickness direction X, the separator 30 is disposed on the side of the first wall 11 facing the electrode assembly 20. A pressure relief channel 102 is formed between the separator 30 and the first wall 11. The pressure relief channel 102 communicates with the receiving cavity 101. The blocking member 50 is disposed in... The pressure relief channel 102 and the blocking member 50 include a connecting shaft 51 and multiple blocking members 52. The axial direction of the connecting shaft 51 intersects the thickness direction X. The multiple blocking members 52 are all connected to the connecting shaft 51. There is a gap 501 between two adjacent blocking members 52. The blocking members 52 are configured to rotate around the axis of the connecting shaft 51 as the rotation center when the battery cell 1 is depressurized through the pressure relief channel 102. The blocking member 50 is provided with a pressure relief mechanism 40 on the side facing and / or away from the electrode assembly 20. The pressure relief mechanism 40 is used to communicate with the pressure relief channel 102 when the battery cell 1 is depressurized through the pressure relief channel 102.

[0104] In this embodiment, when the first wall 11 is located on at least one side of the battery cell 1 along its own height direction, the thickness direction X can also be understood as the height direction of the battery cell 1. As an example, the battery cell 1 provided in this embodiment is configured as a rectangular structure, and the thickness direction X is the height direction of the battery cell 1.

[0105] The housing 10 has a first wall 11, which can be a wall on the housing 110 or a wall on the end cap 120. The separator 30 is located between the first wall 11 and the electrode assembly 20 to isolate the first wall 11 and the electrode assembly 20, thereby improving the insulation performance between the first wall 11 and the electrode assembly 20 and reducing the possibility of electrolyte corrosion of the first wall 11 causing electrical connection problems in the battery cell 1.

[0106] A pressure relief channel 102 is formed between the separator 30 and the first wall 11, which communicates with the receiving cavity 101. The pressure relief channel 102 can provide a flow path for the high-temperature gas generated when the battery cell 1 experiences thermal runaway. "When the battery cell 1 is depressurized through the pressure relief channel 102" means that when the battery cell 1 experiences thermal runaway, the pressure inside the receiving cavity 101 of the battery cell 1 rises abnormally. The pressure relief mechanism 40 opens to communicate with the pressure relief channel 102, and the high-pressure gas generated inside the receiving cavity 101 can flow to the outside of the battery cell 1 through the pressure relief channel 102 to release the internal pressure of the battery cell 1 and reduce the possibility of the battery cell 1 being damaged due to overpressure.

[0107] Optionally, the pressure relief channel 102 can be formed entirely on the isolation member 30 or entirely on the first wall 11. Alternatively, the isolation member 30 has a first channel and the first wall 11 has a second channel. After the isolation member 30 and the first wall 11 are assembled, the first channel and the second channel are connected to form the pressure relief channel 102.

[0108] A blocking member 50 is provided inside the pressure relief channel 102. The blocking member 50 includes a connecting shaft 51 and multiple blocking elements 52 connected to the connecting shaft 51. The connecting shaft 51 can provide support for the blocking elements 52. "The blocking element 52 is configured to rotate around the axis of the connecting shaft 51 when the battery cell 1 is depressurized through the pressure relief channel 102" means that when the battery cell 1 experiences thermal runaway, the high-pressure gas generated in the cavity 101 of the battery cell 1 will carry solid material into the pressure relief channel 102 and act on the blocking element 52 to drive the blocking element 52 to rotate around the axis of the connecting shaft 51. The blocking element 52 can block the solid material entering the pressure relief channel 102, while the high-temperature gas can pass through the gap 501 between the blocking elements 52 to flow to the outside of the battery cell 1. The arrangement of the blocking member 50 and the pressure relief channel 102 can optimize the separation effect of high-pressure gas and solid material to reduce the possibility of solid material being discharged to the outside of the battery cell 1 by the pressure relief mechanism 40.

[0109] Optionally, the blocking member 52 can be rotatably connected to the connecting shaft 51. The blocking member 52 can be rotatably connected to the connecting shaft 51 via a bearing. Alternatively, the blocking member 52 can also be fitted with the connecting shaft 51 with a clearance 501. In this structure, the blocking member 50 can be fixedly connected to the wall of the pressure relief channel 102 via the connecting shaft 51. Of course, the blocking member 50 can also be fixedly connected to the first wall 11 and / or the isolation member 30 via the connecting shaft 51. By setting it in the above manner, it is beneficial to reduce the response time of the rotation of the blocking member 52, so that the blocking member 52 can rotate faster under the impact of high-pressure gas.

[0110] Optionally, the blocking member 52 can be fixedly connected to the connecting shaft 51. In this structure, the blocking member 50 can be rotatably connected to the wall of the pressure relief channel 102 through the connecting shaft 51. Of course, the blocking member 50 can also be rotatably connected to the first wall 11 and / or the isolation member 30 through the connecting shaft 51. By setting it in the above manner, the value of the gap 501 between two adjacent blocking members 52 can be kept constant during the rotation of the blocking member 52, which is beneficial to improving the blocking effect of the blocking member 50 on solid substances. At the same time, it is also beneficial to improve the efficiency of high-pressure gas being discharged from the pressure relief channel 102 through the gap 501.

[0111] "The pressure relief mechanism 40 is used to communicate with the pressure relief channel 102 when the battery cell 1 is depressurized through the pressure relief channel 102" can be understood as follows: in the same projection plane perpendicular to the thickness direction X, the orthographic projection of the pressure relief mechanism 40 falls into the orthographic projection of the pressure relief channel 102. When the battery cell 1 experiences thermal runaway, the electrode assembly 20 ejects high-temperature gas, and the high-temperature gas in the accommodating cavity 101 can enter the pressure relief channel 102 and act on the pressure relief mechanism 40 to quickly release the gas after the pressure relief mechanism 40 is actuated.

[0112] It should be noted that when a battery cell experiences thermal runaway, the high-temperature gases it releases are mainly composed of hydrogen and alkanes, which easily combine with external oxygen to form flue gas. Furthermore, the internal temperature typically exceeds 180°C. On one hand, the bonding effect of the internal active materials deteriorates, allowing them to be expelled from the battery cell along with the thermal runaway gases. On the other hand, some aluminum beads produced by thermal melting under high-temperature conditions are also easily carried out of the battery cell along with the thermal runaway gases. These fixed materials expelled from the battery cell can easily ignite external flue gas and other flammable gases, causing secondary damage to the battery cell.

[0113] Therefore, by setting a blocking member 50 in the pressure relief channel 102 connected to the pressure relief mechanism 40, when the battery cell 1 experiences thermal runaway, the high-temperature gas and solid matter inside the battery cell 1 will flow towards the pressure relief channel 102. The blocking member 52 in the blocking member 50 will start to rotate around the axis of the connecting shaft 51 under the drive of the high-temperature gas, so that the solid matter can be knocked off by the rotating blocking member 52, or attached to the surface of the blocking member 52 and thrown off under the action of the centrifugal force of rotation. The high-temperature gas will flow from the gap 501 between the blocking members 52 to the outside of the pressure relief channel 102, so as to effectively reduce the possibility of solid matter being discharged to the outside of the battery cell 1, thereby avoiding the solid matter from igniting the external oxygen and the flue gas generated by the combination of the released high-temperature gas, which in turn helps to reduce the impact of thermal runaway on the battery cell 1 and improve the reliability of the battery cell 1 under extreme conditions.

[0114] As shown in Figures 7 and 8, the axial direction of the connecting shaft 51 can be the second direction Z. The first direction Y can be the length direction of the battery cell 1, and the second direction Z is the width direction of the battery cell 1. Of course, the second direction Z can be the length direction of the battery cell 1, and the first direction Y can be the width direction of the battery cell 1. That is to say, in this embodiment, the axial direction of the connecting shaft 51 can be the first direction Y or the second direction Z. Alternatively, as shown in Figure 9, the axial direction of the connecting shaft 51 can also be intersected with the thickness direction X, the first direction Y, and the second direction Z respectively. That is to say, the blocking member 52 can rotate with the first direction Y or the second direction Z as the axis, and can also rotate with the axis of the direction that intersects with the thickness direction X, the first direction Y, and the second direction Z respectively. Furthermore, the pressure relief mechanism 40 and the pressure relief channel 102 are arranged opposite each other along the thickness direction X. By setting it in this way, the high-pressure gas can be released more quickly from the pressure relief mechanism 40 to the outside of the battery cell 1.

[0115] It should be noted that if the axis of the connecting shaft is set to the thickness direction, the high-pressure gas, after pushing the blocking component to rotate, is easily affected by the rotation of the blocking component and forms a rotation trajectory with the thickness direction as the axis, which is not conducive to the high-pressure gas being discharged from the pressure relief mechanism above.

[0116] Therefore, by setting the axial direction of the connecting shaft 51 to be either perpendicular to the thickness direction X or inclined to the thickness direction X, the high-pressure gas can push the blocking member 52 to rotate around the axis of the connecting shaft 51 as the rotation center. With this setting, no additional driving component is required, which is beneficial to improving the response speed of the blocking member 50. Furthermore, by setting the axial direction of the connecting shaft 51 to intersect with the thickness direction X, it is also beneficial to reduce the obstruction of the blocking member 52 to the flow of high-pressure gas, thereby improving the efficiency of rapid release of internal pressure when the battery cell 1 experiences thermal runaway.

[0117] Optionally, the pressure relief mechanism 40 can be disposed on the side of the blocking member 50 facing the electrode assembly 20. The pressure relief mechanism 40 can be disposed in the pressure relief channel 102 or in the isolation member 30. In this structure, when the battery cell 1 experiences thermal runaway, the electrode assembly 20 ejects high-pressure gas. The high-pressure gas in the receiving cavity 101 carries solid material and acts on the pressure relief mechanism 40 to actuate it. Then, it enters the pressure relief channel 102 to drive the blocking member 52 to rotate around the axis of the connecting shaft 51. This allows the solid material to be blocked by the blocking member 52, while the high-pressure gas can be released to the outside of the battery cell 1 through the gap 501 between the rotating members.

[0118] Optionally, the pressure relief mechanism 40 can be disposed on the side of the blocking member 50 away from the electrode assembly 20. The pressure relief mechanism 40 can be disposed in the pressure relief channel 102 or on the first wall 11. In this structure, when the battery cell 1 experiences thermal runaway, the electrode assembly 20 ejects high-pressure gas. The high-pressure gas in the receiving cavity 101 carries solid material into the pressure relief channel 102 to drive the blocking member 52 to rotate around the axis of the connecting shaft 51, so that the solid material can be blocked by the blocking member 52. The high-pressure gas can act on the pressure relief mechanism 40 through the gap 501 between the rotating members, so that the pressure relief mechanism 40 is actuated and released to the outside of the battery cell 1.

[0119] Optionally, in the same projection plane perpendicular to the thickness direction X, the orthographic projection of the pressure relief mechanism 40 and the orthographic projection of the blocking member 50 are at least partially overlapped.

[0120] As an example, as shown in Figure 7, the pressure relief mechanism 40 is disposed on the first wall 11, and the isolation member 30 is provided with a pressure relief channel 102. The pressure relief mechanism 40 can be integrally formed with the first wall 11, or the pressure relief mechanism 40 can be separately disposed from and connected to the first wall 11. Optionally, the pressure relief mechanism 40 includes at least one of a rupture diaphragm, a pressure relief valve, or a thermal switch.

[0121] Optionally, the first wall 11 and the spacer 30 can be assembled and connected by welding, fusion or other methods. The first wall 11 and the spacer 30 can also be assembled into one piece by fasteners such as bolts and screws.

[0122] As shown in Figures 7 and 8, in some embodiments, the axial direction of the connecting shaft 51 is perpendicular to the thickness direction X.

[0123] The axial direction of the connecting shaft 51 can be a first direction Y, which is perpendicular to the thickness direction X. Of course, the axial direction of the connecting shaft 51 can also be a second direction Z, which is perpendicular to the thickness direction X. By setting it in the above manner, the blocking member 52 can rotate with the axial direction perpendicular to the thickness direction X, which is beneficial to improving the efficiency of high pressure gas flowing out of the pressure relief channel 102 through the gap 501 of the blocking member 50, thereby improving the pressure relief efficiency of the battery cell 1.

[0124] As shown in Figure 9, the axis of the connecting shaft 51 is set at an acute angle to the thickness direction X, and the angle between the blocking member 52 and the direction perpendicular to the thickness direction X is between 30° and 50°.

[0125] In other words, when the axial direction of the connecting shaft 51 is set at an acute angle to the thickness direction X, the angle between at least one surface of the blocking member 52 along its own thickness direction and the direction perpendicular to the thickness direction X is satisfied to be between 30° and 50°.

[0126] As shown in Figures 6 and 7, the pressure relief channel 102 may have a bottom wall 1021. The bottom wall 1021 surrounds the side of the blocking member 50 facing the electrode assembly 20 along the thickness direction X. As an example, the bottom wall 1021 is perpendicular to the thickness direction X. That is, when the axial direction of the connecting shaft 51 is set at an acute angle with the thickness direction X, the included angle between the blocking member 52 and the bottom wall 1021 is between 30° and 50°.

[0127] As an example, the axial direction of the connecting shaft 51 is set at an acute angle to the thickness direction X, and the angle between the blocking member 52 and the direction perpendicular to the thickness direction X can include, but is not limited to, 30°, 35°, 40°, 45°, 50°, etc.

[0128] If the aforementioned included angle is set too small, i.e. less than 30°, the blocking member 52 will require a greater impact force to rotate, thus affecting the pressure relief efficiency of the battery cell 1. If the aforementioned included angle is set too large, i.e. greater than 50°, the blocking member 52 will be set more tilted, occupying more space in the pressure relief channel 102 along the thickness direction X, thus affecting the space utilization rate of the battery cell 1. Therefore, based on the acute angle between the axial direction of the connecting shaft 51 and the thickness direction X, by setting the included angle between the blocking member 52 and the bottom wall 1021 between 30° and 50°, including the two endpoint values ​​of 30° and 50°, it is beneficial to improve the pressure relief efficiency of the battery cell 1 while reducing the impact on the space utilization rate of the battery cell 1.

[0129] In some embodiments of this application, the battery cell 1 includes a blocking member 50 in which the axial direction of the connecting shaft 51 can be perpendicular to the thickness direction X, and can also be set at an acute angle to the thickness direction X. This allows the connecting shaft 51 to be arranged in multiple positions, which is beneficial to improving the diversity of the blocking member 50, thereby improving the diversity of the battery cell 1.

[0130] In some embodiments, the pressure relief channel 102 can be a cylindrical structure, having a bottom wall 1021 and a side wall 1022 connected to the bottom wall 1021. The bottom wall 1021 surrounds the side of the blocking member 50 facing the electrode assembly 20 along the thickness direction X, and the side wall 1022 surrounds the periphery of the blocking member 50. At least one of the bottom wall 1021 and the side wall 1022 is provided with a through hole 103 communicating the receiving cavity 101 with the pressure relief channel 102.

[0131] Please refer to Figures 6 to 9. In some embodiments, the bottom wall 1021 of the pressure relief channel 102 surrounds the side of the blocking member 50 facing the electrode assembly 20 along the thickness direction X, and the side wall 1022 of the pressure relief channel 102 surrounds the periphery of the blocking member 50. The bottom wall 1021 is connected to the side wall 1022. The bottom wall 1021 is a closed structure, and the side wall 1022 is provided with a through hole 103 that connects the receiving cavity 101 and the pressure relief channel 102.

[0132] In other words, the axial direction of the through hole 103 intersects with the thickness direction X.

[0133] By setting the bottom wall 1021 located between the blocking member 50 and the electrode assembly 20 as a closed structure, the possibility of the blocking member 50 displacing and coming into contact with the electrode assembly 20 when the battery cell 1 vibrates or collides can be reduced. Furthermore, by providing through holes 103 on the periphery of the pressure relief channel 102, the high-pressure gas released from the battery cell 1 into the receiving cavity 101 during thermal runaway can be guided from the side of the pressure relief channel 102 into the pressure relief channel 102, instead of directly entering the pressure relief channel 102 along the thickness direction X. This configuration ensures that the pressure relief channel... The bottom wall 1021 of channel 102 can initially block the solid material in the receiving cavity 101 to reduce the possibility of it entering the pressure relief channel 102. Even if some solid material flows into the pressure relief channel 102 with the high temperature gas, the blocking member 50 in the pressure relief channel 102 can block the solid material a second or third time, thereby further reducing the possibility of the solid material igniting the smoke generated by the combination of external oxygen and the released high temperature gas, so as to better reduce the impact of thermal runaway on the battery cell 1 and improve the reliability of the battery cell 1 under extreme conditions.

[0134] Furthermore, when the battery cell 1 experiences thermal runaway, the high-temperature gas and solid material generated in its cavity 101 will impact the bottom wall 1021 more quickly relative to the side wall 1022. Therefore, the bottom wall 1021, which has a closed structure, can also block some of the solid material in the cavity 101, thereby reducing the mass of the solid material carried by the high-temperature gas through the through hole 103 of the side wall 1022, thus reducing the possibility of the through hole 103 being blocked.

[0135] Furthermore, the high-temperature gas in the accommodating cavity 101 changes its flow direction and enters the pressure relief channel 102 through the through hole 103 of the side wall 1022. This also helps to reduce the impact force of the high-temperature gas on the blocking member 50, thereby reducing the possibility of deformation or damage to the blocking member 50, and thus improving the reliability of the blocking member 50.

[0136] Optionally, the sidewall 1022 can be an arc-shaped structure with a certain curvature; of course, the sidewall 1022 can be a flat plate structure.

[0137] Optionally, the bottom wall 1021 of the pressure relief channel 102 can be a flat plate structure.

[0138] Optionally, the bottom wall 1021 of the pressure relief channel 102 can be configured as an uneven structure, such as a wave shape, which can further improve its blocking effect on solid materials.

[0139] Optionally, there can be one or more through holes 103. Optionally, the shape of the through hole 103 can be circular, quadrilateral or other shapes.

[0140] Optionally, when the pressure relief channel 102 is formed in the isolation member 30, the bottom wall 1021 and the first wall 11 are spaced apart and arranged opposite each other along the thickness direction X, and the side wall 1022 is disposed between the bottom wall 1021 and the first wall 11, wherein the side wall 1022 can be connected to the first wall 11.

[0141] Please refer to Figures 7 to 9. In some embodiments, the sidewall 1022 includes two first sidewalls 1023 spaced apart along a first direction Y and two second sidewalls 1024 spaced apart along a second direction Z. The first sidewalls 1023 and the second sidewalls 1024 are alternately connected, and at least one of the two first sidewalls 1023 and the two second sidewalls 1024 is provided with a through hole 103.

[0142] Please refer to Figures 7 to 9. In some embodiments, the sidewall 1022 includes two first sidewalls 1023 spaced apart along the first direction Y and two second sidewalls 1024 spaced apart along the second direction Z. The first sidewalls 1023 and the second sidewalls 1024 are alternately connected. The blocking member 52 has a windward surface 502 on one side along its own thickness direction X. The first direction Y, the second direction Z and the thickness direction X intersect each other.

[0143] As shown in Figures 8 and 9, the blocking member 52 has a windward surface 502 and a leeward surface 503 on opposite sides along its thickness direction X. The "windward surface 502" refers to the surface of the blocking member 52 that is subjected to the impact force of high-pressure gas, and the "leeward surface 503" refers to the surface that is not subjected to the impact force of high-pressure gas. The windward surface 502 of the blocking member 52 is not shown in Figure 9, but it should be understood that the windward surface 502 of the blocking member 52 is located on the opposite side of the leeward surface 503.

[0144] In some embodiments, at least one first sidewall 1023 is provided with a through hole 103, and in the same projection plane perpendicular to the first direction Y, the orthographic projection of the through hole 103 at least partially overlaps with the orthographic projection of the windward surface 502.

[0145] In other words, when the blocking member 52 is stationary or rotating, the surface facing the through hole 103 or the surface receiving the impact force of high-pressure gas is the windward surface 502, and the other side of the blocking member 52 along its own thickness direction X is the leeward surface 503. The blocking member 52 rotates from the windward surface 502 to the leeward surface 503.

[0146] By at least partially overlapping the through hole 103 on the first sidewall 1023 with the orthographic projection of the windward surface 502, the high-pressure gas entering the pressure relief channel 102 through the through hole 103 can directly impact the windward surface 502. In other words, the above method can directly convert the gas pressure into the rotational torque of the blocking member 52, which is beneficial to enable the blocking member 52 to be driven to rotate quickly when thermal runaway occurs inside the battery cell 1, shortening the response time of the blocking member 50 to thermal runaway, and improving the pressure relief efficiency of the battery cell 1.

[0147] Optionally, a blocking member 50 is provided in the pressure relief channel 102, and either of the two first side walls 1023 is provided with a through hole 103. In the same projection plane perpendicular to the first direction Y, the orthographic projection of the through hole 103 overlaps at least partially with the orthographic projection of the windward surface 502, so that the blocking member 52 can be rotated around the axis of the connecting shaft 51 by the airflow impact on one side, reducing the possibility that the high pressure gas will form turbulence in the pressure relief channel 102 and hinder the rotation of the blocking member 52.

[0148] Optionally, as shown in Figures 8 and 9, the pressure relief channel 102 is provided with two blocking members 50, which are distributed at intervals along the first direction X. Both first sidewalls 1023 are provided with through holes 103. In the same projection plane perpendicular to the first direction Y, the orthographic projection of the through hole 103 at least partially overlaps with the orthographic projection of the windward surface 502. By setting it in this way, the blocking member 52 located on the left side of the figure can be rotated around the axis of the connecting shaft 51 by the airflow impact located on the left side of the figure, and the blocking member 52 located on the right side of the figure can be rotated around the axis of the connecting shaft 51 by the airflow impact located on the right side of the figure. The rotation directions of the two blocking members 50 can be the same or opposite, which is beneficial to improving the blocking effect of the blocking members 50 on solid materials and also beneficial to improving the pressure relief efficiency of the battery cell 1.

[0149] Optionally, at least one of the second sidewalls 1024 is provided with a through hole 103, and in the same projection plane perpendicular to the second direction Z, the orthographic projection of the through hole 103 at least partially overlaps with the orthographic projection of the windward surface 502.

[0150] By at least partially overlapping the through hole 103 on the second sidewall 1024 with the orthographic projection of the windward surface 502, the high-pressure gas entering the pressure relief channel 102 through the through hole 103 can directly impact the windward surface 502. In other words, the above method can directly convert the gas pressure into the rotational torque of the blocking member 52, which is beneficial to enable the blocking member 52 to be driven to rotate quickly when thermal runaway occurs inside the battery cell 1, shortening the response time of the blocking member 50 to thermal runaway, and improving the pressure relief efficiency of the battery cell 1.

[0151] Optionally, a blocking member 50 is provided in the pressure relief channel 102, and either of the two second side walls 1024 is provided with a through hole 103. In the same projection plane perpendicular to the second direction Z, the orthographic projection of the through hole 103 at least partially overlaps with the orthographic projection of the windward surface 502, so that the blocking member 52 can be rotated around the axis of the connecting shaft 51 by the airflow impact on one side, reducing the possibility that the high pressure gas will form turbulence in the pressure relief channel 102 and hinder the rotation of the blocking member 52.

[0152] Optionally, the pressure relief channel 102 is provided with two blocking members 50, which are distributed at intervals along the second direction Z. Both second sidewalls 1024 are provided with through holes 103. In the same projection plane perpendicular to the second direction Z, the orthographic projection of the through hole 103 overlaps at least partially with the orthographic projection of the windward surface 502. The rotation directions of the two blocking members 50 can be the same or opposite. This arrangement is beneficial to improving the blocking effect of the blocking members 50 on solid materials and also to improving the pressure relief efficiency of the battery cell 1.

[0153] Please refer to Figures 8 and 9. In some embodiments, the sidewall 1022 and the bottom wall 1021 are set at an obtuse angle, and the angle between the sidewall 1022 and the direction perpendicular to the thickness direction X satisfies the condition between 120° and 150°.

[0154] The bottom wall 1021 can be perpendicular to the thickness direction X or not. When the bottom wall 1021 is perpendicular to the thickness direction X, the angle between the side wall 1022 and the bottom wall 1021 is between 120° and 150°. When the bottom wall 1021 is not perpendicular to the thickness direction X, the side wall 1022 and the bottom wall 1021 are set at an obtuse angle, and the angle between the side wall 1022 and the direction perpendicular to the thickness direction X is between 120° and 150°.

[0155] If the side wall 1022 and the bottom wall 1021 are set at an acute angle or a right angle, there may be dead air angles in the pressure relief channel 102, which will increase the collision and consumption of high pressure gas in the pressure relief channel 102. Therefore, by setting the side wall 1022 and the bottom wall 1021 at an obtuse angle, it is beneficial to improve the efficiency of high pressure gas driving the blocking member 52 to rotate.

[0156] As an example, the sidewall 1022 and the bottom wall 1021 are set at an obtuse angle, and the angle between the sidewall 1022 and the direction perpendicular to the thickness direction X can include, but is not limited to, 120°, 130°, 140°, 150°, etc.

[0157] If the included angle is set too small, i.e. less than 120°, the pressure relief channel 102 will be designed too small, which will easily lead to blockage. If the included angle is set too large, i.e. greater than 150°, the length of the pressure relief channel 102 in the thickness direction X will be set too small, which will not be conducive to the assembly of the blocking member 50 in the pressure relief channel 102. Alternatively, the length of the pressure relief channel 102 in the thickness direction X will be set too large, making the battery cell 1 too large and reducing the space utilization of the battery cell 1.

[0158] Therefore, by setting the sidewall 1022 and the bottom wall 1021 at an obtuse angle, the angle between the sidewall 1022 and the direction perpendicular to the thickness direction X is set between 120° and 150°, including two endpoint values ​​of 120° and 150°. This layout is reasonable, which not only facilitates the assembly of the blocking component 50 in the pressure relief channel 102, but also reduces the impact on the space utilization of the battery cell 1. In addition, it is also beneficial to optimize the flow path of high-pressure gas in the pressure relief channel 102.

[0159] Optionally, the sidewall 1022 and the bottom wall 1021 are set at an obtuse angle, and the angle between the sidewall 1022 and the direction perpendicular to the thickness direction X satisfies the condition between 120° and 140°.

[0160] Please refer to Figures 8 and 9. In some embodiments, the battery cell 1 further includes a bracket 60, which is disposed in the pressure relief channel 102 and connected to the bottom wall 1021. The connecting shaft 51 is connected to the bracket 60.

[0161] The bracket 60 is used to support and fix the blocking member 50. The blocking member 50 is fixed in the pressure relief channel 102 by the bracket 60. When high-pressure gas impacts the blocking member 52, the rotational torque is transmitted to the bracket 60 through the connecting shaft 51, and then to the bottom wall 1021 by the bracket 60. This helps to reduce the possibility of stress concentration in the connecting shaft 51, which may lead to bending or breakage. At the same time, it can also reduce the force transmitted from the connecting shaft 51 to the bottom wall 1021, thereby improving the structural strength of the battery cell 1. Furthermore, the bracket 60 can isolate the direct contact between the connecting shaft 51 and the bottom wall 1021, which also helps to reduce the impact of vibration, collision or heat generation on the connecting shaft 51 during the operation of the battery cell 1. This helps to improve the reliability of the blocking member 52 being able to rotate around the axis of the connecting shaft 51.

[0162] Optionally, the bracket 60 can be tilted within the pressure relief channel 102 so that the axial direction of the connecting shaft 51 intersects with the thickness direction X.

[0163] Optionally, the connecting shaft 51 can be fixedly connected to the bracket 60, or it can be rotatably connected to the bracket 60.

[0164] Please refer to Figures 8 and 9. In some embodiments, the bracket 60 includes a first frame 61 and a second frame 62 that are intersected. The second frame 62 is located between the side wall 1022 and the first frame 61. The first frame 61 has a first end 611 and a second end 612 that are disposed opposite to each other. The second frame 62 has a third end 621 and a fourth end 622 that are disposed opposite to each other. The first end 611 is connected to the bottom wall 1021, the second end 612 is connected to the third end 621, and the fourth end 622 is connected to the bottom wall 1021.

[0165] The first frame 61 and the second frame 62 can be structures formed by connecting rods or columns to reduce the weight of the support 60. Optionally, the structures of the first frame 61 and the second frame 62 can be the same or different, and the included angle formed between the first frame 61 and the second frame 62 can be an obtuse angle or a right angle.

[0166] By setting the bracket 60 as an intersecting structure including the first frame 61 and the second frame 62, and fixing the two ends of the first frame 61 and the second frame 62 to the bottom wall 1021 respectively, the bracket 60 can form a stable triangular structure, which is beneficial to improving the support effect of the bracket 60 on the blocking member 50, and can also provide rotation space for the rotation of the blocking member 52, reducing the possibility of the blocking member 52 interfering with the bracket 60 during rotation.

[0167] In some embodiments, the first frame 61 is connected to a connecting shaft 51, and the angle between the first frame 61 and the direction perpendicular to the thickness direction X is between 30° and 60°.

[0168] As shown in Figures 8 and 9, when the connecting shaft 51 is connected to the first frame 61, the angle between the first frame 61 and the direction perpendicular to the thickness direction X is between 30° and 60°. For example, when the connecting shaft 51 is connected to the first frame 61, the angle between the first frame 61 and the bottom wall 1021 is between 30° and 60°, and the second end 612 and the third end 621 are both located between the first end 611 and the fourth end 622. The angle between the first frame 61 and the second frame 62 is an obtuse angle, that is, the inclination of the second frame 62 relative to the bottom wall 1021 is greater than the inclination of the first frame 61 relative to the bottom wall 1021. This arrangement facilitates the assembly of the connecting shaft 51 on the first frame 61, has a reasonable layout, and helps to reduce the overall space occupied by the blocking member 50 and the bracket 60 on the battery cell 1.

[0169] In some embodiments, the second frame 62 is connected to a connecting shaft 51, and the angle between the second frame 62 and the direction perpendicular to the thickness direction X is between 30° and 60°.

[0170] When the connecting shaft 51 is connected to the second frame 62, the angle between the second frame 62 and the direction perpendicular to the thickness direction X is between 30° and 60°. For example, when the connecting shaft 51 is connected to the second frame 62, the angle between the second frame 62 and the bottom wall 1021 is between 30° and 60°, and the second end 612 and the third end 621 are both located between the first end 611 and the fourth end 622. The angle between the first frame 61 and the second frame 62 is an obtuse angle. That is to say, the inclination of the second frame 62 relative to the bottom wall 1021 is less than the inclination of the first frame 61 relative to the bottom wall 1021. This arrangement facilitates the assembly of the connecting shaft 51 on the second frame 62, has a reasonable layout, and helps to reduce the overall space occupied by the blocking member 50 and the bracket 60 on the battery cell 1.

[0171] In some embodiments, there are multiple pressure relief channels 102, and each pressure relief channel 102 is provided with a blocking member 50.

[0172] In other words, multiple pressure relief channels 102 can be formed between the isolation member 30 and the first wall 11. The pressure relief mechanism 40 can communicate with each pressure relief channel 102 when the battery cell 1 is depressurized through the pressure relief channel 102. The multiple pressure relief channels 102 are connected.

[0173] By setting the number of pressure relief channels 102 to multiple, it is beneficial to improve the pressure relief efficiency of the battery cell 1. At the same time, by setting the number of blocking members 50 to multiple, it is beneficial to further improve the blocking effect of the blocking members 50 on solid materials, so as to further reduce the possibility of solid materials being discharged to the outside of the battery cell 1. This helps to avoid the solid materials igniting the external oxygen and the flue gas generated by the combination of the discharged high-temperature gas, thereby reducing the impact of thermal runaway on the battery cell 1 and improving the reliability of the battery cell 1 under extreme conditions.

[0174] Optionally, the multiple pressure relief channels 102 can be distributed along the first direction Y or along the second direction Z.

[0175] Please refer to Figures 8 and 9. In some embodiments, the pressure relief channel 102 is provided with two blocking members 50. The two blocking members 50 are spaced apart along the first direction Y and are symmetrically arranged about an axis extending along the thickness direction X. The first direction Y intersects the thickness direction X.

[0176] The two blocking members 50 are symmetrically arranged with respect to an axis extending along the thickness direction X. That is, two supports 60 are also provided in the pressure relief channel 102, and the two supports 60 are symmetrically arranged with respect to an axis extending along the thickness direction X. In this structure, both first sidewalls 1023 are provided with through holes 103. This arrangement helps to enhance the blocking member 50's ability to intercept solid materials. Furthermore, the two blocking members 50 work together to guide the airflow direction, which helps to further optimize the pressure relief efficiency of the battery cell 1. In addition, by setting two blocking members 50, when one of the blocking members 50 fails, the other blocking member 50 can still work normally, which also helps to improve the stability and reliability of the blocking members 50.

[0177] In some embodiments, the included angle between two adjacent blocking members 52 is between 15° and 90°.

[0178] As an example, the included angle between two adjacent blocking members 52 may include, but is not limited to, 15°, 30°, 50°, 60°, 70°, 80°, 90°, etc.

[0179] If the included angle is set too small, i.e. less than 15°, the number of blocking members 52 will be too large, increasing the structural complexity and the risk of interference between adjacent blocking members 52, thereby reducing the stability and reliability of the blocking member 50. If the included angle is set too large, i.e. less than 90°, the gap 501 between adjacent blocking members 52 will be too large, reducing the blocking effect of the blocking member 52 on solid materials. Therefore, by setting the included angle between adjacent blocking members 52 between 15° and 90°, including the two endpoint values ​​of 15° and 90°, it is beneficial to simplify the structure of the blocking member 50 and improve the blocking effect of the blocking member 50 on solid materials, thereby reducing the possibility of solid materials being discharged to the outside of the battery cell 1 and improving the reliability of the battery cell 1 under extreme conditions.

[0180] In some embodiments, the shape of the blocking member 52 includes at least one of a quadrilateral and a sector.

[0181] The shape of the blocking component 52 can be quadrilateral, which can include, but is not limited to, square, rectangle, trapezoid, etc., as shown in Figure 8. The blocking component 52 can be set as a rectangle, which simplifies the processing technology and reduces the manufacturing difficulty. As shown in Figure 9, the blocking component 52 can also be set as a fan shape. The arc edge of the fan shape can optimize the airflow distribution, so that the blocking component 52 can change direction more smoothly during rotation.

[0182] Referring to Figure 7, in some embodiments, the isolation member 30 has a first surface 301 facing the first wall 11 and a second surface 302 facing away from the first wall 11. The isolation member 30 is provided with a recess 31 that is recessed along the direction from the first surface 301 to the second surface 302. A pressure relief channel 102 is formed between the recess 31 and the first wall 11. The first wall 11 is provided with a pressure relief mechanism 40.

[0183] By placing the pressure relief channel 102 on the isolation member 30, it is beneficial to reduce the impact on the structural strength of the first wall 11, thereby improving the reliability of the casing 10 and the battery cell 1. Furthermore, by providing the pressure relief mechanism 40 on the first wall 11, the connection between the outside of the battery cell 1 and the pressure relief channel 102 can be better isolated, thereby reducing the possibility of external impurities or particles entering the pressure relief channel 102. This is beneficial to improving the service life and reliability of the blocking member 50, and further improving the reliability of the battery cell 1 under extreme conditions.

[0184] In some embodiments, the housing 10 includes a housing 110 and an end cap 120, the housing 110 having an opening 1101, the end cap 120 closing the opening 1101, and the end cap 120 including a first wall 11.

[0185] The housing 110 has a receiving cavity 101 and an opening 1101 communicating with the receiving cavity 101. The above-mentioned arrangement facilitates the processing and manufacturing of the housing 10 and the assembly of the housing 10, which helps to reduce the cost of the battery cell 1.

[0186] In the specific assembly process, the end cap 120 and the separator 30 can be assembled together first, and then the whole assembly can be assembled with the housing 110.

[0187] As shown in Figure 6, in some embodiments, along the thickness direction X, the side surface of the recess 31 facing away from the first wall 11 protrudes from the second surface 302.

[0188] The recess 31 can be formed on the separator 30 by processes such as stamping or extrusion. During the process of forming the recess 31, the first surface 301 is recessed toward the second surface 302, and the second surface 302 protrudes from the side opposite to the first surface 301 to form the recess 31.

[0189] By setting it in this way, the influence of the recess 31 on the strength of the separator 30 can be reduced, and the side surface of the recess 31 facing away from the first wall 11 can also contact the electrode assembly 20, providing a limiting or supporting function for the electrode assembly 20, preventing the electrode assembly 20 from shifting during normal operation of the battery cell 1, which is beneficial to improving the reliability of the battery cell 1.

[0190] Furthermore, it facilitates the fabrication of through holes 103 on the sidewall 1022 of the pressure relief channel 102, and also makes the dimensions of the other parts of the isolation member 30 outside the recess 31 smaller in the thickness direction X, thereby reducing cost and weight, and also helping to reduce the space occupied.

[0191] According to some embodiments of this application, this application also provides a battery device 100, including a plurality of battery cells 1 provided according to any of the above embodiments.

[0192] According to some embodiments of this application, this application also provides an energy storage device 200, including a battery cell 1 provided according to any of the above embodiments or a battery device 100 provided according to any of the above embodiments, wherein the battery cell 1 or the battery device 100 is used to store electrical energy or provide electrical energy.

[0193] According to some embodiments of this application, this application also provides an energy storage system 2000, including a power conversion device and an energy storage device 200 provided according to any of the above embodiments, wherein the power conversion device is used to electrically connect the power generation device 3000 and the energy storage device 200.

[0194] According to some embodiments of this application, this application also provides a charging network 1000, including a charging pile 300 and an energy storage device 200 or an energy storage system 2000 provided according to any of the above embodiments, wherein the energy storage device 200 is used to provide electrical energy to the charging pile 300.

[0195] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0196] Please refer to Figures 6 to 9 together. According to some embodiments of this application, this application provides a battery cell 1, including a housing 10, an electrode assembly 20, an insulating member 30, a blocking member 50, a pressure relief mechanism 40, and a support 60, wherein the thickness direction X of the first wall 11 is the height direction of the battery cell 1, the first direction Y is the length direction of the battery cell 1, and the second direction Y is the width direction of the battery cell 1.

[0197] The housing 10 includes a housing 110 and an end cap 120. The housing 110 has a receiving cavity 101 and an opening 1101 communicating with the receiving cavity 101. The end cap 120 covers the opening 1101. The end cap 120 includes a first wall 11, which surrounds one side of the receiving cavity 101 along the thickness direction X. The electrode assembly 20 is received in the receiving cavity 101. A pressure relief mechanism 40 is disposed on the first wall 11. The pressure relief mechanism 40 is used to communicate with the pressure relief channel 102 when the battery cell 1 is depressurized through the pressure relief channel 102.

[0198] Along the thickness direction X, the isolation member 30 is disposed on the side of the first wall 11 facing the electrode assembly 20. The isolation member 30 has a first surface 301 facing the first wall 11 and a second surface 302 facing away from the first wall 11. The isolation member 30 is provided with a recess 31 that is recessed along the direction from the first surface 301 to the second surface 302. A pressure relief channel 102 is formed between the recess 31 and the first wall 11. The bottom wall 1021 of the pressure relief channel 102 surrounds the side of the blocking member 50 along the thickness direction X facing the electrode assembly 20. The sidewall 1022 of the pressure relief channel 102 surrounds the periphery of the blocking member 50, and the bottom wall 1021 is connected to the sidewall 1022. The included angle between the sidewall 1022 and the bottom wall 1021 is between 120° and 150°. The sidewall 1022 includes two first sidewalls 1023 spaced apart along the first direction Y and two second sidewalls 1024 spaced apart along the second direction Z. The first sidewalls 1023 and the second sidewalls 1024 are alternately connected, and the bottom wall 1021 is a closed structure.

[0199] A blocking member 50 is disposed in the pressure relief channel 102. The blocking member 50 includes a connecting shaft 51 and a plurality of blocking elements 52. There is a gap 501 between two adjacent blocking elements 52. The included angle between two adjacent blocking elements 52 is between 15° and 90°. The shape of the blocking element 52 includes at least one of quadrilateral and sector. The blocking element 52 is configured to rotate about the axis of the connecting shaft 51 as the rotation center when the battery cell 1 is depressurized through the pressure relief channel 102. The blocking element 52 has a windward surface 502 on one side along its own thickness direction X.

[0200] The axial direction of the connecting shaft 51 can be a first direction Y. At least one first sidewall 1023 is provided with a through hole 103 that connects the receiving cavity 101 and the pressure relief channel 102. In the same projection plane perpendicular to the first direction Y, the orthographic projection of the through hole 103 and the orthographic projection of the windward surface 502 at least partially overlap. Alternatively, the axial direction of the connecting shaft 51 can be a second direction Z. At least one second sidewall 1024 is provided with a through hole 103 that connects the receiving cavity 101 and the pressure relief channel 102. In the same projection plane perpendicular to the second direction Z, the orthographic projection of the through hole 103 and the orthographic projection of the windward surface 502 at least partially overlap. Alternatively, the axial direction of the connecting shaft 51 is set at an acute angle with the thickness direction X, and the included angle between the blocking member 52 and the bottom wall 1021 satisfies a value between 30° and 50°.

[0201] A bracket 60 is disposed in the pressure relief channel 102 and connected to the bottom wall 1021, and a connecting shaft 51 is connected to the bracket 60. The bracket 60 includes a first frame 61 and a second frame 62 that are intersecting each other. The second frame 62 is located between the side wall 1022 and the first frame 61. The first frame 61 has a first end 611 and a second end 612 that are disposed opposite to each other, and the second frame 62 has a third end 621 and a fourth end 622 that are disposed opposite to each other. The first end 611 is connected to the bottom wall 1021, the second end 612 is connected to the third end 621, and the fourth end 622 is connected to the bottom wall 1021. The first frame 61 is connected to the connecting shaft 51, and the included angle between the first frame 61 and the bottom wall 1021 is satisfied between 30° and 60°.

[0202] There are multiple pressure relief channels 102, and each pressure relief channel 102 is provided with a blocking member 50, and / or, the pressure relief channel 102 is provided with two blocking members 50, the two blocking members 50 are spaced apart along the first direction Y, and the two blocking members 50 are symmetrically arranged about an axis extending along the thickness direction X.

[0203] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0204] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended 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 they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized in that, include: The outer shell has a receiving cavity and a first wall, which surrounds one side of the receiving cavity along the thickness direction of the first wall; An electrode assembly is housed in the receiving cavity; a separator is disposed along the thickness direction on the side of the first wall facing the electrode assembly, forming a pressure relief channel between the separator and the first wall, the pressure relief channel communicating with the receiving cavity; a blocking member is disposed in the pressure relief channel, the blocking member including a connecting shaft and multiple blocking members, the axial direction of the connecting shaft intersecting the thickness direction, the multiple blocking members being connected to the connecting shaft, a gap being present between adjacent blocking members, the blocking members being configured to rotate around the axis of the connecting shaft as the rotation center when the battery cell is depressurized through the pressure relief channel; a pressure relief mechanism is provided on the side of the blocking member facing and / or away from the electrode assembly, the pressure relief mechanism being used to communicate with the pressure relief channel when the battery cell is depressurized through the pressure relief channel.

2. The battery cell according to claim 1, characterized in that, The axial direction of the connecting shaft is perpendicular to the thickness direction; or, the axial direction of the connecting shaft is set at an acute angle to the thickness direction, and the angle between the blocking member and the direction perpendicular to the thickness direction is between 30° and 50°.

3. The battery cell according to claim 1 or 2, characterized in that, The bottom wall of the pressure relief channel surrounds the side of the blocking member facing the electrode assembly along the thickness direction. The side wall of the pressure relief channel surrounds the periphery of the blocking member. The bottom wall is connected to the side wall. The bottom wall is a closed structure. The side wall is provided with a through hole that connects the receiving cavity and the pressure relief channel.

4. The battery cell according to claim 3, characterized in that, The sidewall includes two first sidewalls spaced apart along a first direction and two second sidewalls spaced apart along a second direction. The first sidewalls and the second sidewalls are alternately connected. The blocking member has a windward surface on one side along its own thickness direction. The first direction, the second direction and the thickness direction intersect each other. At least one of the first sidewalls is provided with the through hole, and in the same projection plane perpendicular to the first direction, the orthographic projection of the through hole at least partially overlaps with the orthographic projection of the windward surface; and / or, at least one of the second sidewalls is provided with the through hole, and in the same projection plane perpendicular to the first direction, the orthographic projection of the through hole at least partially overlaps with the orthographic projection of the windward surface.

5. The battery cell according to claim 3, characterized in that, The sidewall and the bottom wall are set at an obtuse angle, and the angle between the sidewall and the direction perpendicular to the thickness direction is between 120° and 150°.

6. The battery cell according to claim 3, characterized in that, The battery cell also includes a bracket, which is disposed in the pressure relief channel and connected to the bottom wall, and the connecting shaft is connected to the bracket.

7. The battery cell according to claim 6, characterized in that, The support includes a first frame and a second frame that intersect each other. The second frame is located between the side wall and the first frame. The first frame has a first end and a second end that are opposite to each other. The second frame has a third end and a fourth end that are opposite to each other. The first end is connected to the bottom wall, the second end is connected to the third end, and the fourth end is connected to the bottom wall. The first frame is connected to the connecting shaft. The angle between the first frame and the direction perpendicular to the thickness direction is between 30° and 60°. And / or, the second frame is connected to the connecting shaft. The angle between the second frame and the direction perpendicular to the thickness direction is between 30° and 60°.

8. The battery cell according to claim 1 or 2, characterized in that, The number of pressure relief channels is multiple, and each pressure relief channel is provided with the blocking member; and / or, the pressure relief channel is provided with two blocking members, the two blocking members are spaced apart along a first direction, and the two blocking members are symmetrically arranged with an axis extending along the thickness direction, the first direction intersecting the thickness direction.

9. The battery cell according to claim 1 or 2, characterized in that, The included angle between two adjacent blocking elements is between 15° and 90°.

10. The battery cell according to claim 1 or 2, characterized in that, The shape of the blocking element includes at least one of quadrilateral and sector.

11. The battery cell according to claim 1 or 2, characterized in that, The isolating member has a first surface facing the first wall and a second surface facing away from the first wall. The isolating member is provided with a recessed portion in the direction from the first surface to the second surface, and the recessed portion forms the pressure relief channel between itself and the first wall. The first wall is provided with the pressure relief mechanism. And / or, the housing includes a shell and an end cap, the shell having an opening, the end cap closing onto the opening, and the end cap including the first wall.

12. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1 to 11.

13. An energy storage device, characterized in that, It includes a plurality of battery cells according to any one of claims 1 to 11 or a plurality of battery devices according to claim 12, wherein the battery cells or the battery devices are used to store electrical energy or provide electrical energy.

14. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device as described in claim 13, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

15. A charging network, characterized in that, It includes a charging pile and an energy storage device as described in claim 13 or an energy storage system as described in claim 14, wherein the energy storage device is used to provide electrical energy to the charging pile.

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