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

Abstract

The embodiment of 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 and a separation structure, the shell is provided with a first wall provided with a pressure relief mechanism, the electrode assembly is accommodated in an accommodating cavity of the shell, and along a first direction, the separator is arranged on one side, facing the electrode assembly, of the first wall; a pressure relief channel is formed between the isolation piece and the first wall, the pressure relief mechanism is used for being communicated with the pressure relief channel in the pressure relief state, the isolation piece is provided with a through hole communicated with the containing cavity, the separation structure is arranged on the pressure relief channel and comprises a housing with a separation cavity, the housing is provided with an inlet and an outlet, and the axis of the inlet intersects with the axis of the outlet. The inlet corresponds to the through hole, the containing cavity is communicated with the separation cavity through the through hole and the inlet, and the pressure relief channel is communicated with the separation cavity through the outlet. According to the invention, the reliability of the battery monomer under an extreme condition is improved.

Description

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 Art

[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. Utility Model Content

[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 first wall, the first wall having a pressure relief mechanism; an electrode assembly housed within a receiving cavity of the housing; a separator along a first direction, the separator being disposed on the side of the first wall facing the electrode assembly, a pressure relief channel being formed between the separator and the first wall, the pressure relief mechanism being used to communicate with the pressure relief channel in a pressure-relieved state, the separator having a through hole communicating with the receiving cavity; and a separation structure disposed in the pressure relief channel, the separation structure comprising a cover having a separation cavity, the cover having an inlet and an outlet, the axis of the inlet intersecting the axis of the outlet, the inlet being correspondingly disposed with the through hole, the receiving cavity and the separation cavity being connected through the through hole and the inlet, and the pressure relief channel and the separation cavity being connected through the outlet.

[0006] In some embodiments of the first aspect, by setting a separation structure in the pressure relief channel connected to the pressure relief mechanism, and the separation structure having an intersecting inlet and outlet, when the battery cell experiences thermal runaway, the high-temperature gas mixed with solid matter in its containment cavity can flow into the separation cavity sequentially through the through hole and the inlet. Since the flowability of gas is better than that of solid matter, the high-temperature gas in the separation cavity can change direction and flow into the pressure relief channel from the outlet, causing the pressure relief mechanism to be actuated to discharge to the outside of the battery cell. The solid matter will be thrown towards the inner wall of the separation cavity due to inertia, which can effectively separate the high-temperature gas and solid matter, thereby reducing the possibility of solid matter being discharged to the outside of the battery cell. This can effectively reduce the smoke generated by the solid matter igniting external oxygen and combining with the discharged high-temperature gas, thereby helping to reduce the impact of thermal runaway on the battery cell and improve the reliability of the battery cell under extreme conditions.

[0007] In some embodiments, the housing has a first end wall and a second end wall connected to each other. The first end wall surrounds the side of the separation chamber facing the pressure relief mechanism, and the second end wall surrounds the periphery of the separation chamber. The first end wall has an outlet, and the second end wall has an inlet. This arrangement is reasonable and facilitates the machining of the inlet and outlet on the housing.

[0008] In some embodiments, the housing has a third end wall connected to the second end wall and disposed opposite to the first end wall, the housing extending in a direction from the third end wall to the first end wall; or, the second end wall has an intersection point and an opening disposed opposite to each other, the first end wall is disposed at the opening, and the housing extends in a direction from the intersection point to the first end wall; the extending direction of the housing intersects the axis of the inlet; the separation chamber has a circular cross-section perpendicular to the extending direction of the housing, and / or, the housing has an annular cross-section perpendicular to its extending direction.

[0009] The above technical solution facilitates the processing and manufacturing of the cover.

[0010] In some embodiments, the separation cavity is at least one of a cylindrical, conical, and frustum-shaped structure, and / or the housing is at least one of a cylindrical, conical, and frustum-shaped structure.

[0011] The above-mentioned design improves the flexibility of processing the shape of the casing.

[0012] In some embodiments, along the extending direction of the housing, the cross-sectional dimension of the separation chamber on the side near the pressure relief mechanism, perpendicular to the extending direction of the housing, is greater than the cross-sectional dimension on the side away from the pressure relief mechanism, perpendicular to the extending direction of the housing.

[0013] In the above technical solution, by placing the inlet and outlet on the side with the larger cross-sectional size of the separation chamber, the possibility of solid substances filling the area of ​​the separation chamber near the inlet and outlet can be reduced, thereby improving the effectiveness of high-temperature gas entering the pressure relief channel from the separation chamber.

[0014] In some embodiments, the axis of the inlet is tangent to the circumferential direction of the separation chamber, and / or the axis of the inlet is tangent to the circumferential direction of the cover; and / or the through hole is coaxially arranged with the inlet.

[0015] This design allows the high-temperature gas to rotate and generate centrifugal force after entering the separation chamber, which in turn throws the solid material against the inner wall of the separation chamber. This improves the separation effect of the separation structure on both high-temperature gas and solid material, thereby enhancing the reliability of the battery cells under extreme conditions.

[0016] In some embodiments, the battery cell further includes an inlet pipe extending tangent to the circumferential direction of the separation chamber, and / or, the inlet pipe extending tangent to the circumferential direction of the casing; the inlet pipe is connected to the side of the separator facing the receiving cavity and communicates with a through hole; and / or, the inlet pipe is connected between the casing and the separator and communicates with the inlet and the through hole; and / or, the separation structure further includes an outlet pipe connected to the side of the casing along its extending direction near the pressure relief mechanism and communicates with the outlet and the pressure relief mechanism.

[0017] In the above technical solution, by setting inlet pipe and / or outlet pipe, it is beneficial to improve the effectiveness of high temperature gas rotation in the separation chamber, and also to improve the centrifugal force effect, thereby improving the separation efficiency of solid substances and high temperature gas.

[0018] In some embodiments, the housing includes a first housing and a second housing coaxially arranged. Along the extending direction of the housing, the first housing is connected to the side of the second housing facing the pressure relief mechanism. The first housing has an inlet and an outlet. Along the extending direction of the housing, the first housing has a first end and a second end opposite to each other, and the second housing has a third end and a fourth end opposite to each other. The third end communicates with the second end. The cross-sectional dimension of the second end perpendicular to the extending direction of the housing is less than or equal to the cross-sectional dimension of the first end perpendicular to the extending direction of the housing. The cross-sectional dimension of the third end perpendicular to the extending direction of the housing is equal to the cross-sectional dimension of the second end perpendicular to the extending direction of the housing. The cross-sectional dimension of the fourth end perpendicular to the extending direction of the housing is less than the cross-sectional dimension of the third end perpendicular to the extending direction of the housing.

[0019] By configuring the casing with the above structure, the high-temperature gas separated from the solid material can form an internal swirling flow and be discharged from the outlet to the pressure relief channel, which helps to improve the efficiency of high-temperature gas discharge, thereby improving the pressure relief efficiency of the battery cell and thus improving the reliability of the battery cell under extreme conditions.

[0020] In some alternative embodiments, the angle between the extension direction of the cover and the first direction is greater than 45° and less than or equal to 90°.

[0021] In the above technical solution, the separation structure can be arranged in the pressure relief channel, which is beneficial to improving the flexibility of the separation structure layout.

[0022] In some embodiments, the angle between the extending direction of the cover and the first direction is 90°, and along the first direction, the side of the separator opposite to the first wall is provided with a through hole.

[0023] This design facilitates the assembly of the separate structures and allows for a more compact arrangement of individual battery cells.

[0024] In some embodiments, along a first direction, the isolation member has a first surface facing the first wall and a second surface facing away from the first wall. The isolation member is provided with a first recess that is recessed in the direction from the first surface to the second surface. A pressure relief channel is formed between the first wall and the first recess. The first recess is provided with a through hole.

[0025] In the above technical solution, the separation structure can be positioned between the first wall and the first recess, thereby improving the utilization rate of the internal space of the battery cell.

[0026] In some embodiments, along a first direction, the side of the first recess facing away from the first wall protrudes from the second surface.

[0027] By setting it in the above manner, the influence of the first recess on the strength of the separator can be reduced, and the surface of the first recess facing away from the first wall can also contact the electrode assembly, providing a limiting or supporting function for the electrode assembly. This reduces the displacement of the electrode assembly during normal operation of the battery cell, which is beneficial to improving the reliability of the battery cell.

[0028] In some embodiments, the angle between the extending direction of the cover and the first direction is greater than or equal to 0° and less than or equal to 45°, and the periphery of the first recess is provided with a through hole.

[0029] In the above technical solution, the separation structure can be arranged in the pressure relief channel, which is beneficial to improving the flexibility of the separation structure layout.

[0030] In some embodiments, the electrode assembly includes a main body and a first electrode tab and a second electrode tab connected to the main body. At least a portion of the first electrode tab is disposed on one side of the first recess along a second direction, and at least a portion of the second electrode tab is disposed on the other side of the first recess along the second direction, wherein the first direction intersects the second direction.

[0031] In the above technical solution, the first tab and the second tab can be accommodated on both sides of the first recess, making the internal structure of the battery cell more compact.

[0032] In some embodiments, along a first direction, the first wall has a third side facing the isolator and a fourth side facing away from the isolator, the first wall is provided with a second recess recessed in the direction from the third side to the fourth side, a pressure relief channel is formed between the isolator and the second recess, and the second recess is provided with a pressure relief mechanism.

[0033] In the above technical solution, by setting a second recess, the size of the pressure relief channel in the first direction can be increased, thereby increasing the space for high-temperature gas flow, which is beneficial to improving the rate of high-temperature gas discharge during thermal runaway.

[0034] In some embodiments, along the first direction, the second recess protrudes from the fourth surface on the side opposite to the spacer.

[0035] By setting it in the above manner, the impact of the second recess on the strength of the first wall can be reduced, thereby improving the reliability of the battery cell.

[0036] 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.

[0037] 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 or provide electrical energy.

[0038] 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.

[0039] 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.

[0040] 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

[0041] 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.

[0042] Figure 1 This is a schematic diagram of the structure of a charging network in some embodiments of this application;

[0043] Figure 2 This is a schematic diagram of the structure of an energy storage system according to some embodiments of this application;

[0044] Figure 3 This is a schematic diagram of the structure of an energy storage device in some embodiments of this application;

[0045] Figure 4 This is a schematic diagram of the structure of a battery cell assembly provided in some embodiments of this application;

[0046] Figure 5This application provides an exploded structural diagram of a battery device according to some embodiments.

[0047] Figure 6 This application provides an exploded structural diagram of a single battery cell for some embodiments.

[0048] Figure 7 A partial cross-sectional view of a battery cell provided for some embodiments of this application;

[0049] Figure 8 A partial cross-sectional view of a battery cell provided for other embodiments of this application;

[0050] Figure 9 A partial cross-sectional view of a battery cell provided for some embodiments of this application;

[0051] Figure 10 A partial cross-sectional view of a separated structure in a battery cell provided in some embodiments of this application;

[0052] Figure 11 This is a partial cross-sectional view of a battery cell provided in some embodiments of this application.

[0053] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0054] 1000, Charging network; 2000, Energy storage system; 3000, Power generation device;

[0055] 200. Energy storage device; 210. Energy storage container; 300. Charging pile; 400. Energy storage converter;

[0056] 100. Battery device; 4. Battery cell assembly;

[0057] 1. Battery cell; 2. Housing; 201. First housing; 202. Second housing;

[0058] 10. Outer shell; 110. Housing; 1101. Housing opening; 1102. Receiving cavity; 120. End cap; 11. First wall; 111. Third surface; 112. Fourth surface; 113. Second recess;

[0059] 101. Pressure relief channel;

[0060] 20. Electrode assembly; 21. Main body; 22. First electrode tab; 23. Second electrode tab;

[0061] 30. Spacer; 301. Through hole; 31. First surface; 32. Second surface; 33. First recess;

[0062] 40. Pressure relief mechanism; 60. Electrode terminals;

[0063] 50. Separation structure; 51. Housing; 501. Separation chamber; 502. Inlet; 503. Outlet; 511. First housing; 5111. First end; 5112. Second end; 512. Second housing; 5121. Third end; 5122. Fourth end; 5001. First end wall; 5002. Second end wall; 5003. Third end wall; 5004. Intersection point; 5005. Opening; 5021. First sub-end wall; 5022. Second sub-end wall; 52. Inlet pipe; 53. Outlet pipe;

[0064] X, first direction; Y, second direction; A, extension direction. DETAILED DESCRIPTION

[0065] 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.

[0066] 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.

[0067] 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.

[0068] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0069] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0070] 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.

[0071] In this application, "multiple" means two or more (including two).

[0072] 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.

[0073] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] Based on the above-mentioned technical problems, this application provides a battery cell including a casing, an electrode assembly, a separator, and a separation structure. The casing has a first wall with a pressure relief mechanism. The electrode assembly is housed in a receiving cavity of the casing. Along a first direction, the separator is disposed 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 mechanism is used to communicate with the pressure relief channel in a pressure-relieved state. The separator has a through hole communicating with the receiving cavity. The separation structure is disposed in the pressure relief channel. The separation structure includes a cover with a separation cavity. The cover has an inlet and an outlet. The axis of the inlet intersects the axis of the outlet. The inlet and the through hole are correspondingly arranged. The receiving cavity and the separation cavity are connected through the through hole and the inlet. The pressure relief channel and the separation cavity are connected through the outlet.

[0078] By setting a separation structure in the pressure relief channel connected to the pressure relief mechanism, and the separation structure having an intersecting inlet and outlet, when a battery cell experiences thermal runaway, the high-temperature gas mixed with solid matter in its containment cavity can flow into the separation cavity sequentially through the through hole and the inlet. Since the flowability of gas is better than that of solid matter, the high-temperature gas in the separation cavity can change direction and flow into the pressure relief channel from the outlet, causing the pressure relief mechanism to be actuated and discharged to the outside of the battery cell. Due to inertia, the solid matter will be thrown against the inner wall of the separation cavity, either falling into the separation cavity or adhering to the inner wall of the separation cavity. This effectively separates the high-temperature gas and solid matter, reducing the possibility of solid matter being discharged to the outside of the battery cell. This reduces the amount of smoke generated by the solid matter igniting external oxygen and combining with the discharged high-temperature gas, thereby helping to reduce the impact of thermal runaway on the battery cell and improve the reliability of the battery cell under extreme conditions.

[0079] 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.

[0080] Please see Figure 1 , Figure 3 and Figure 6 , Figure 1 This is a schematic diagram of the structure of a charging network 1000 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of an energy storage device 200 provided in some embodiments of this application. Figure 6 This is an exploded structural diagram of a battery cell 1 provided in some embodiments of this application. Embodiments of this application provide a charging network 1000, which includes a charging pile 300 for charging electrical equipment. The charging network 1000 may further include an energy storage device 200, which is electrically connected to the charging pile 300 and provides power to the charging pile 300.

[0081] 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.

[0082] 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.

[0083] As an example, such as Figure 1 As shown, 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.

[0084] like Figure 3 As shown, 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.

[0085] Please see Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of an energy storage system 2000 provided in some embodiments of this application. Embodiments of this application provide an energy storage system 2000. The energy storage system 2000 includes an energy storage converter 400, which is 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.

[0086] 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.

[0087] As an example, such as Figure 2As shown, 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.

[0088] like Figure 3 As shown, the energy storage device 200 includes an energy storage box 210, and a battery device 100 is installed inside the energy storage box 210.

[0089] As an example, the energy storage device 200 can be an energy storage container, an energy storage cabinet, etc.

[0090] 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.

[0091] Please see Figure 4 , Figure 4 This 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.

[0092] In some embodiments, the battery cell assembly 4 is typically formed by arranging multiple battery cells 1.

[0093] Please see Figure 5 , Figure 5 This is an exploded structural diagram of a battery device 100 provided for some embodiments of this application. In some embodiments, the battery device 100 may be a battery pack, which includes a housing 2 and one or more battery cell assemblies 4, the battery cell assemblies 4 being housed within the housing 2.

[0094] 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.

[0095] 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.

[0096] 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 a receiving cavity, thereby creating a closed space inside the housing 2 to house 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] Please see Figure 6 The battery cell 1 includes a housing 10 and an electrode assembly 20.

[0102] 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 1102, 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.

[0103] 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.

[0104] 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.

[0105] In some embodiments, the housing 10 includes an end cap 120 and a housing 110. The housing 110 has a receiving cavity 1102 and a housing opening 1101 communicating with the receiving cavity 1102. The end cap 120 covers the housing opening 1101. The housing 110 may have one or more housing openings 1101. The end cap 120 may also be provided in one or more ways.

[0106] 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.

[0107] 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.

[0108] In some embodiments, the electrode assembly 20 may be cylindrical, flat, or polygonal in shape.

[0109] The electrode assembly 20 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0110] 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.

[0111] Please continue reading. 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] Please refer to the following: Figures 6 to 10 , Figure 7 This is a partial cross-sectional view of a battery cell 1 provided in some embodiments of this application. Figure 8 This is a partial cross-sectional view of a battery cell 1 provided in some other embodiments of this application. Figure 9 This application provides a partial cross-sectional view of a battery cell 1 according to some embodiments. Figure 10 This is a partial cross-sectional view of a separation structure 50 in a battery cell 1 provided for some embodiments of this application.

[0116] According to an embodiment of this application, a battery cell 1 is provided, including a housing 10, an electrode assembly 20, a separator 30, and a separation structure 50. The housing 10 has a first wall 11, and the first wall 11 is provided with a pressure relief mechanism 40. The electrode assembly 20 is accommodated in a receiving cavity 1102 of the housing 10. Along a first direction X, the separator 30 is disposed on the side of the first wall 11 facing the electrode assembly 20, and a pressure relief channel 101 is formed between the separator 30 and the first wall 11. The pressure relief mechanism 40 is used to communicate with the pressure relief channel 101 in a pressure-relieved state. The separator 30 is provided with a through hole 301 communicating with the receiving cavity 1102. The separation structure 50 is disposed in the pressure relief channel 101. The separation structure 50 includes a cover 51, the cover 51 has a separation cavity 501, the cover 51 is provided with an inlet 502 and an outlet 503, the axis of the inlet 502 intersects the axis of the outlet 503, the inlet 502 is correspondingly disposed with the through hole 301, the receiving cavity 1102 and the separation cavity 501 are connected through the through hole 301 and the inlet 502, and the pressure relief channel 101 and the separation cavity 501 are connected through the outlet 503.

[0117] In this embodiment of the application, the first direction X can be understood as the thickness direction of the first wall 11. When the first wall 11 is located on at least one side of the battery cell 1 along its own height direction, the first direction X can also be understood as the height direction of the battery cell 1.

[0118] The outer casing 10 has a first wall 11, which can be a wall on the casing 110 or a wall on the end cap 120.

[0119] The separator 30 is located between the first wall 11 and the electrode assembly 20 to improve the insulation performance of the first wall 11 and the electrode assembly 20, thereby isolating the first wall 11 and the electrode assembly 20. This helps to reduce the possibility of electrolyte corrosion of the first wall 11 causing electrical connection problems in the battery cell 1.

[0120] 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.

[0121] A pressure relief mechanism 40 is disposed on the first wall 11, forming a pressure relief channel 101 between the first wall 11 and the separator 30. The pressure relief channel 101 provides a flow path for the high-temperature gas generated during thermal runaway of the battery cell 1. The pressure relief mechanism 40 is used to communicate with the pressure relief channel 101 in a pressure-relieved state. "In a pressure-relieved state" means that when the internal pressure of the battery cell 1 rises abnormally, the pressure relief mechanism 40 opens to communicate with the pressure relief channel 101 to release the internal pressure of the battery cell 1 and prevent the battery cell 1 from being damaged due to overpressure. As an example, 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.

[0122] The pressure relief mechanism 40 is located on the side of the pressure relief channel 101 facing away from the isolation member 30 along the first direction X. Optionally, the orthographic projection of the pressure relief mechanism 40 overlaps with the orthographic projection of the pressure relief channel 101 in the same projection plane perpendicular to the first direction X, or the orthographic projection of the pressure relief mechanism 40 falls into the orthographic projection of the pressure relief channel 101.

[0123] When the battery cell 1 experiences thermal runaway, the electrode assembly 20 ejects high-temperature gas. The high-temperature gas in the containment cavity 1102 can enter the pressure relief channel 101 through the through hole 301, inlet 502, separation cavity 501 and outlet 503, and act on the pressure relief mechanism 40 to quickly release the gas after the pressure relief mechanism 40 is activated.

[0124] "The axis of inlet 502 intersects with the axis of outlet 503" can be understood as inlet 502 and outlet 503 being set to intersect, or it can be understood as inlet 502 having an opening direction different from outlet 503 having an opening direction. Here, the axis can be understood as a straight line passing through the geometric center of inlet 502 or outlet 503. Taking inlet 502 as an example, when inlet 502 is circular or elliptical, the axis is a straight line passing through the center of the circle or the center of the ellipse.

[0125] The separation structure 50 is located in the pressure relief channel 101. The high-temperature gas and solid matter generated by thermal runaway in the containment cavity 1102 will first pass through the separation structure 50 and then enter the pressure relief channel 101. When the solid matter in the containment cavity 1102 enters the separation cavity 501 along with the high-temperature gas through the through hole 301 and the inlet 502, the opening direction of the inlet 502 intersects with the opening direction of the outlet 503, causing the solid matter to be thrown onto the inner wall of the separation cavity 501 under inertial action. Due to the good flowability of the gas, the high-temperature gas can change direction and flow into the pressure relief channel 101 from the outlet 503, which can effectively reduce the possibility of solid matter being discharged from the pressure relief mechanism 40 to the outside of the battery cell 1, thereby effectively avoiding the potential risk of thermal runaway diffusion.

[0126] 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.

[0127] Therefore, in some embodiments of this application, the battery cell 1 is provided with a separation structure 50 in the pressure relief channel 101 connected to the pressure relief mechanism 40. The separation structure 50 has an inlet 502 and an outlet 503 that are intersecting. When the battery cell 1 experiences thermal runaway, the high-temperature gas mixed with solid matter in its receiving cavity 1102 can flow into the separation cavity 501 through the through hole 301 and the inlet 502 in sequence. Since the flowability of gas is better than that of solid matter, the high-temperature gas in the separation cavity 501 can change direction and flow into the pressure relief channel 101 through the outlet 503. The pressure relief mechanism 40 is activated by channel 101 to discharge solid matter to the outside of the battery cell 1. Due to inertia, solid matter will be thrown against the inner wall of the separation chamber 501, either falling into the separation chamber 501 or adhering to the inner wall of the separation chamber 501. This effectively separates high-temperature gas and solid matter, reducing the possibility of solid matter being discharged to the outside of the battery cell 1. This reduces the amount of smoke generated by the solid matter igniting external oxygen and combining with the discharged high-temperature gas, thereby helping to reduce the impact of thermal runaway on the battery cell 1 and improving the reliability of the battery cell 1 under extreme conditions.

[0128] In addition, during the depressurization process, the high-temperature gas mixed with solid matter in the containment cavity 1102 will first enter the separation cavity 501 of the cover 51, and then enter the depressurization channel 101 and be discharged by the depressurization mechanism 40. This can reduce the impact of the high-temperature gas on the first wall 11, thereby improving the reliability of the battery cell 1 under extreme conditions.

[0129] Furthermore, the separation structure 50 can also support the first wall 11 and the separator 30 to improve the structural strength of the first wall 11 and the separator 30, thereby reducing the risk of deformation of the two and improving the service life of the battery cell 1.

[0130] In some embodiments, the material of the cover 51 can be a high-temperature resistant and high-strength material, such as stainless steel or titanium alloy, to ensure that the cover 51 can withstand high temperature and high pressure without deformation or cracking when the battery cell 1 experiences thermal runaway.

[0131] The separation structure 50 can be connected between the first wall 11 and the spacer 30, and the connection method can include, but is not limited to, bonding, welding, snap-fitting, and fastener connection. The separation structure 50 can be connected to the first wall 11, or the separation structure 50 can also be connected to the spacer 30, or the separation structure 50 can be connected to both the first wall 11 and the spacer 30.

[0132] Optionally, the inlet 502 can be circular, polygonal, or other shapes. Optionally, the outlet 503 can be circular, polygonal, or other shapes. Optionally, the through-hole 301 can be circular, polygonal, or other shapes.

[0133] Optionally, the opening area of ​​the outlet 503 can be larger or smaller than the opening area of ​​the inlet 502.

[0134] Optionally, the cover 51 can be a symmetrical structure or an irregular structure.

[0135] Optionally, the inlet 502 and the outlet 503 can both be located on the same wall of the housing 51, or the inlet 502 and the outlet 503 can be located on different walls of the housing 51 respectively.

[0136] like Figures 7 to 9 As shown, in some embodiments, the housing 51 has a first end wall 5001 and a second end wall 5002 connected to each other. The first end wall 5001 surrounds the separation cavity 501 on the side facing the pressure relief mechanism 40, and the second end wall 5002 surrounds the periphery of the separation cavity 501. The first end wall 5001 is provided with an outlet 503, and the second end wall 5002 is provided with an inlet 502.

[0137] By setting the inlet 502 and outlet 503 on different walls so that their axes intersect, it is easier to process and manufacture on the casing 51, which helps to reduce the cost of the battery cell 1.

[0138] like Figure 7 and Figure 9 As shown, in some embodiments, the housing 51 has a third end wall 5003, which is connected to the second end wall 5002 and disposed opposite to the first end wall 5001. The housing 51 extends along the direction from the third end wall 5003 to the first end wall 5001, and the extension direction A of the housing 51 intersects the axis of the inlet 502.

[0139] like Figure 8 As shown, in some other embodiments, the second end wall 5002 has an intersection point 5004 and an opening 5005 disposed opposite to each other, the first end wall 5001 is disposed at the opening 5005, and the cover 51 extends along the direction from the intersection point 5004 to the first end wall 5001, and the extension direction A of the cover 51 intersects the axis of the inlet 502.

[0140] In this embodiment of the application, the cover 51 may include a third end wall 5003 disposed opposite to the first end wall 5001. That is, the second end wall 5002 may be configured as a structure in which both sides are not closed. The first end wall 5001 and the third end wall 5003 are respectively connected to the two sides of the second end wall 5002. In this structure, the direction from the third end wall 5003 to the first end wall 5001 is the extension direction A of the cover 51.

[0141] Alternatively, the housing 51 may include only the first end wall 5001 and the second end wall 5002. That is, the second end wall 5002 may be configured such that only one side is open while the other side is closed. In other words, the second end wall 5002 has an intersection point 5004 and an opening 5005 that are arranged opposite to each other. The intersection point 5004 refers to the point where the second end walls 5002 meet to form a closed structure. In this structure, the direction from the intersection point 5004 to the first end wall 5001 is the extension direction A of the housing 51.

[0142] The direction from the third end wall 5003 to the first end wall 5001 can be the same as the direction from the intersection point 5004 to the first end wall 5001.

[0143] In some embodiments, the separation cavity 501 has a circular cross-section in the extending direction A perpendicular to the housing 51.

[0144] The extension direction A of the cover 51 can be from the third end wall 5003 to the first end wall 5001, or it can be from the intersection point 5004 to the first end wall 5001.

[0145] The cross section of the separation cavity 501 refers to the cross section formed by cutting the separation cavity 501 along the direction perpendicular to the extension direction A of the cover 51.

[0146] By setting it in the above manner, the separation chamber 501 is easier to process during manufacturing, and the circular structure of the separation chamber 501 also facilitates the flow of internal gas.

[0147] When the cross-sectional shape of the separation cavity 501 is circular, the cover 51 can optionally be configured as a cylindrical structure, a conical structure, or a frustum structure, or a combination of at least two of these structures. This allows for a reduction in the material used in the cover 51 while ensuring that the cross-section of the internal separation cavity 501 is circular, thereby reducing the cost and weight of the battery cell 1. Alternatively, the cover 51 can also be configured as a polygonal structure, or other structures with the same shape as the pressure relief channel 101, to make the cover 51 more tightly fitted to the first wall 11 and the separator 30, which is beneficial for improving the structural strength of the battery cell 1.

[0148] In some embodiments, the cross-section of the cover 51 in the extension direction A perpendicular to the cover 51 is an annular structure.

[0149] The cross-section of the cover 51 refers to the cross-section of the separation cavity 501 formed by cutting the cover 51 along a direction perpendicular to its extension direction A. This design ensures that the cross-section of the separation cavity 501 is circular.

[0150] It should be noted that when the cross-section of the cover 51 perpendicular to the extension direction A is a ring structure, the cross-section of its separation cavity 501 perpendicular to the extension direction A is a circular structure.

[0151] Optionally, the shape of the pressure relief channel 101 matches the shape of the cover 51 so that the cover 51 is more tightly fitted with the first wall 11 and the separator 30, which is beneficial to improving the structural strength of the battery cell 1.

[0152] For example, the cross-section of the separation cavity 501 perpendicular to the extension direction A of the cover 51 is a circular structure, and the cross-section of the cover 51 perpendicular to the extension direction A is an annular structure. By setting it in this way, the material used and space occupied by the cover 51 can be reduced, thereby reducing the cost and weight of the battery cell 1, and also helping to improve the structural compactness of the battery cell 1.

[0153] Optionally, along the extension direction A of the housing 51, the side of the housing 51 facing the pressure relief mechanism 40 is provided with an inlet 502 and an outlet 503.

[0154] Optionally, the axis of outlet 503 is parallel to the extension direction A.

[0155] Optionally, the extension direction A of the cover 51 can be parallel to the first direction X, or it can intersect the first direction X.

[0156] Optionally, the first end wall 5001 of the housing 51 surrounds the separation cavity 501 on the side facing the pressure relief mechanism 40 along the extension direction A of the housing 51.

[0157] In some embodiments, the separation cavity 501 is at least one of a cylindrical, conical, or frustum-shaped structure.

[0158] The separation cavity 501 can be cylindrical, conical, or frustum-shaped. The separation cavity 501 can also be a combination of any two or three of the above structures.

[0159] In some embodiments, the housing 51 is at least one of a cylindrical, conical, or frustum-shaped structure.

[0160] The cover 51 can be cylindrical, conical, or frustum-shaped, and the separation cavity 501 can be a combination of any two or three of the above structures.

[0161] The above-mentioned configuration helps to improve the processing flexibility of battery cell 1.

[0162] Please continue reading. Figures 7 to 9In some embodiments, along the extension direction A of the housing 51, the cross-sectional dimension of the separation cavity 501 on the side near the pressure relief mechanism 40, perpendicular to the extension direction A of the housing 51, is larger than the cross-sectional dimension on the side away from the pressure relief mechanism 40, perpendicular to the extension direction A of the housing 51.

[0163] This configuration allows the separation chamber 501 to have a larger space on the side near the pressure relief mechanism 40, which facilitates the smoother discharge of high-temperature gas from the outlet 503, reduces pressure buildup, and improves the pressure relief efficiency of the battery cell 1. Furthermore, by connecting both the inlet 502 and the outlet 503 to the side of the separation chamber 501 with a larger cross-sectional dimension, the possibility of solid matter filling the area of ​​the separation chamber 501 near the inlet 502 and the outlet 503 can be reduced, thereby improving the effectiveness of high-temperature gas entering the pressure relief channel 101 from the separation chamber 501.

[0164] In some embodiments, along the extending direction A of the housing 51, the cross-sectional dimension of the side of the housing 51 closest to the pressure relief mechanism that is perpendicular to its extending direction A is larger than the cross-sectional dimension of the side of the housing 51 furthest from the pressure relief mechanism that is perpendicular to its extending direction A.

[0165] When the cross-sectional dimension of the separation chamber 501 on the side closer to the pressure relief mechanism 40 is larger than the cross-sectional dimension on the side farther from the pressure relief mechanism 40, the cross-sectional dimension of the cover 51 on the side closer to the pressure relief mechanism can be further set to be larger than the cross-sectional dimension on the side farther from the pressure relief mechanism. This is beneficial to reduce the material used and space occupied by the cover 51, thereby reducing the cost and weight of the battery cell 1 and improving the structural compactness of the battery cell 1.

[0166] In some embodiments, the axis of the inlet 502 is tangent to the circumferential direction of the separation chamber 501.

[0167] By tangentially designing the axis of inlet 502, the high-temperature gas enters the separation chamber 501 tangentially and rotates at high speed. During the rotation, the solid material that enters the separation chamber 501 along with the high-temperature gas is thrown towards the inner wall of the separation chamber 501 under the action of centrifugal force. This helps to improve the separation effect of the separation structure 50 on the high-temperature gas and solid material, thereby better improving the reliability of the battery cell 1 under extreme conditions.

[0168] In some embodiments, the axis of the inlet 502 is tangent to the circumferential direction of the cover 51.

[0169] When the axis of the inlet 502 is tangent to the circumferential direction of the separation chamber 501, the shape of the cover 51 can be further designed to be tangent to the inlet 502. This helps to reduce the material used and space occupied by the cover 51, thereby reducing the cost and weight of the battery cell 1 and improving the structural compactness of the battery cell 1.

[0170] For example, the circumferential direction of the separation cavity 501 is the same as that of the cover 51. That is, the cross section of the cover 51 perpendicular to its extension direction A is a ring structure, and the cross section of the separation cavity 501 enclosed by the cover 51 perpendicular to the extension direction A of the cover 51 is a circular structure. Under this structure, it is convenient to process and manufacture the cover 51, and it is also beneficial to reduce the amount of material used to reduce costs.

[0171] In some embodiments, the through hole 301 is coaxially arranged with the inlet 502.

[0172] This arrangement ensures that the axis of the through hole 301 is tangent to the circumference of the cover 51, which better satisfies the effectiveness of the rotational motion generated after the high-temperature gas enters the separation chamber 501, and facilitates the processing and installation positioning of the through hole 301 and the inlet 502.

[0173] In some embodiments, the housing 51 has an inlet 502.

[0174] By providing only one shell opening 1101 on the casing 51, the high-temperature gas separated from the solid material in the separation chamber 501 can first form an outer swirling flow and rotate towards the side with a smaller cross-sectional size perpendicular to the extension direction A of the casing 51 inside the separation chamber 501. Then, the high-temperature gas can form an inner swirling flow and pass through the outer swirling flow to rotate towards the side with a larger cross-sectional size perpendicular to the extension direction A of the casing 51 inside the separation chamber 501, and then be discharged from the outlet 503 to the pressure relief channel 101. This is beneficial to improving the efficiency of high-temperature gas discharge, thereby improving the pressure relief efficiency of the battery cell 1. Furthermore, as the high-temperature gas continues to rotate, more solid material can be thrown onto the inner wall of the separation chamber 501, which is beneficial to improving the separation effect of the separation structure 50 on gas and solid material, and thus improving the reliability of the battery cell 1 under extreme conditions.

[0175] The battery cell 1 provided in this application embodiment has a circular cross-section of the separation chamber 501 perpendicular to the extension direction A of the cover 51. The cross-sectional dimension of the separation chamber 501 along the extension direction A of the cover 51 near the pressure relief mechanism 40 is set to be larger than the cross-sectional dimension of the side of the separation chamber 501 away from the pressure relief mechanism 40. The axis of the inlet 502 is tangent to the circumference of the separation chamber 501. An outlet 503 and an inlet 502 are provided on the side of the cover 51 facing the pressure relief mechanism 40. This allows the high-temperature gas mixed with solid matter to enter the separation chamber 501 through the through-hole 301 and the inlet 502, and the high-temperature gas can... The high-temperature gas moving along the inner wall of the separation chamber 501 rotates towards the side with the smaller cross-sectional size perpendicular to the extension direction A of the casing 51, forming an outer swirling flow. The high-temperature gas moving to the side of the separation chamber 501 with the smaller cross-sectional size perpendicular to the extension direction A of the casing 51 rotates along the inner wall of the separation chamber 501 towards the side with the larger cross-sectional size perpendicular to the extension direction A of the casing 51, forming an inner swirling flow. The inner swirling flow can pass between the outer swirling flow without interfering with it, allowing it to be smoothly discharged from the outlet 503. Meanwhile, the denser solid material is thrown towards the inner wall of the separation chamber 501 under the action of centrifugal force, so that the solid material and the high-temperature gas passing through the separation structure 50 are separated.

[0176] Furthermore, having only one inlet 502 on the casing 51 simplifies the structure, reduces the complexity of processing and assembling the casing 51, and thus lowers costs. At the same time, it allows the high-temperature gas to flow along a preset path after entering the separation chamber 501, reducing the possibility of turbulent flow, thereby further improving the separation effect of high-temperature gas and solid matter and the depressurization efficiency of the battery cell 1.

[0177] Optionally, the through hole 301 corresponding to the inlet 502 of the same cover 51 can be set as one or more. For example, the through hole 301 is set one-to-one with the inlet 502, and the through hole 301 and the inlet 502 have the same shape, which facilitates the release of high temperature gas.

[0178] Please see Figure 7 , Figure 10 as well as Figure 11 , Figure 11 This is a partial cross-sectional view of a battery cell 1 provided for some embodiments of this application. In some embodiments, the battery cell 1 further includes an inlet pipe 52, the inlet pipe 52 extending tangent to the circumferential direction of the separation cavity 501, and / or, the inlet pipe 52 extending tangent to the circumferential direction of the cover 51. The inlet pipe 52 is connected to the side of the separator 30 facing the receiving cavity 1102 and communicates with the through hole 301.

[0179] like Figure 11As shown, when the battery cell 1 experiences thermal runaway, the high-temperature gas in the containment cavity 1102 can flow into the separation cavity 501 through the inlet pipe 52, the through hole 301 and the inlet 502 in sequence. By setting the inlet pipe 52, the flow distance of the gas entering the separation cavity 501 in the tangential direction can be increased, so that it can better form a rotational motion in the separation cavity 501.

[0180] Furthermore, the inlet pipe 52 can balance the speed and pressure loss of the airflow. If the speed is too low, the centrifugal force will be insufficient, which will reduce the separation effect of solid matter and high temperature gas. If the speed is too high, it may intensify the turbulence in the separation chamber 501, which will reduce the separation efficiency. Therefore, by setting the inlet pipe 52, the separation effect of the separation structure 50 on solid matter and high temperature gas can also be improved.

[0181] In other embodiments, the inlet pipe 52 is connected between the housing 51 and the isolation member 30, and connects the inlet 502 and the through hole 301.

[0182] like Figure 7 and Figure 10 As shown, the inlet pipe 52 can also be set between the cover 51 and the isolation member 30, which can also achieve the above-mentioned effect.

[0183] like Figure 7 , Figure 10 as well as Figure 11 As shown, in some embodiments, the separation structure 50 further includes an outlet pipe 53, which is connected to the side of the housing 51 along its extension direction A near the pressure relief mechanism 40 and connects the outlet 503 with the pressure relief mechanism 40.

[0184] By setting the outlet pipe 53, the possibility of high-temperature gas entering the separation chamber 501 from the inlet 502 being directly discharged from the outlet 503 can be reduced. It should be noted that if the high-temperature gas entering the separation chamber 501 from the inlet 502 is directly discharged from the outlet 503, the high-temperature gas may also carry some solid matter with it. Therefore, by setting it in the above manner, it is beneficial to reduce the possibility of solid matter being discharged to the outside of the battery cell 1.

[0185] Please see Figure 10In some embodiments, the cover 51 includes a first cover 511 and a second cover 512 coaxially arranged. Along the extending direction A of the cover 51, the first cover 511 is connected to the side of the second cover 512 facing the pressure relief mechanism 40. The first cover 511 is provided with an inlet 502 and an outlet 503. Along the extension direction A of the cover 51, the first cover 511 has a first end 5111 and a second end 5112, and the second cover 512 has a third end 5121 and a fourth end 5122. The third end 5121 is connected to the second end 5112. The cross-sectional dimension of the second end 5112 perpendicular to the extension direction A of the cover 51 is less than or equal to the cross-sectional dimension of the first end 5111 perpendicular to the extension direction A. The cross-sectional dimension of the third end 5121 perpendicular to the extension direction A of the cover 51 is equal to the cross-sectional dimension of the second end 5112 perpendicular to the extension direction A of the cover 51. The cross-sectional dimension of the fourth end 5122 perpendicular to the extension direction A of the cover 51 is less than the cross-sectional dimension of the third end 5121 perpendicular to the extension direction A of the cover 51.

[0186] The first end wall 5001 of the cover 51 is a wall of the first cover 511 that is away from the second cover 512. The second end wall 5002 of the cover 51 includes a first sub-end wall 5021 and a second sub-end wall 5022. The first cover 511 has a first sub-end wall 5021 connected to the first end wall 5001, and the second cover 512 has a second sub-end wall 5022 connected to the first sub-end wall 5021. The first sub-end wall 5021 is provided with an inlet 502, and the first end wall 5001 is provided with an outlet 503.

[0187] By configuring the casing 51 with the above-described structure, it is beneficial to improve the effectiveness of forming external and internal swirling flows of high-temperature gas within the separation chamber 501.

[0188] Among them, such as Figure 10 As shown, when the housing 51 also includes a third end wall 5003, the third end wall 5003 is connected to the second sub-end wall 5022.

[0189] In some embodiments, the first cover 511 is a cylindrical structure. In this structure, the cross-sectional dimension of the second end 5112 perpendicular to the extending direction A of the cover 51 is equal to the cross-sectional dimension of the first end 5111 perpendicular to the extending direction A of the cover 51.

[0190] In some embodiments, the second cover 512 is a conical structure or a frustum structure.

[0191] The second sub-end wall 5022 of the second cover 512, which is a conical structure, has an intersection point 5004 on the side opposite to the first end wall 5001.

[0192] The second sub-end wall 5022 of the second cover body 512, which is a frustum structure, is connected to a third end wall 5003 on the side opposite to the first end wall 5001.

[0193] This configuration helps improve the effectiveness of the high-temperature gas, after being separated from the solid material, in forming an internal swirling flow.

[0194] Please see Figure 7 and Figure 11 In some embodiments, the angle between the extension direction A of the cover 51 and the first direction X is greater than 45° and less than or equal to 90°.

[0195] The separation structure 50 can be arranged in the pressure relief channel 101 at any of the above angles, which helps to improve the flexibility of the layout of the separation structure 50.

[0196] Furthermore, in some embodiments, the angle between the extending direction A of the cover 51 and the first direction X is greater than or equal to 80° and less than or equal to 90°.

[0197] By setting it in this way, the space occupied by the separation structure 50 in the pressure relief channel 101 along the first direction X can be reduced, thereby making the battery cell 1 more compact.

[0198] In some embodiments, the angle between the extending direction A of the cover 51 and the first direction X is 90°, and along the first direction X, the side of the isolation member 30 opposite to the first wall 11 is provided with a through hole 301.

[0199] This configuration facilitates the assembly of the separate structure 50 and allows for a more compact arrangement of the battery cells 1.

[0200] When the first direction X is vertical, the separation structure 50 can be placed horizontally in the pressure relief channel 101. Along the first direction X, the separation structure 50 is provided with an inlet 502 on the side opposite to the first wall 11, and the isolation member 30 is provided with a through hole 301 on the side opposite to the first wall 11.

[0201] like Figure 7 As shown, in some embodiments, along the first direction X, the isolation member 30 has a first surface 31 facing the first wall 11 and a second surface 32 facing away from the first wall 11. The isolation member 30 is provided with a first recess 33 recessed along the direction from the first surface 31 to the second surface 32. A pressure relief channel 101 is formed between the first wall 11 and the first recess 33. The first recess 33 is provided with a through hole 301.

[0202] By providing a first recess 33 in the separator 30, the separation structure 50 can be disposed between the first wall 11 and the first recess 33, thereby improving the utilization rate of the internal space of the battery cell 1.

[0203] Optionally, the spacer 30 is provided with a first recess 33 and the first wall 11 is a plate-like structure.

[0204] In some embodiments, along the first direction X, the first recess 33 protrudes from the second surface 32 on the side opposite to the first wall 11.

[0205] The first recess 33 can be formed on the separator 30 by processes such as stamping or extrusion. During the formation of the first recess 33, the first surface 31 is recessed toward the second surface 32, and the second surface 32 protrudes toward the side away from the first surface 31 to form the first recess 33.

[0206] By setting it in this way, the influence of the first recess 33 on the strength of the separator 30 can be reduced, and the surface of the first recess 33 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. This reduces the possibility of displacement of the electrode assembly 20 during normal operation of the battery cell 1, which is beneficial to improving the reliability of the battery cell 1.

[0207] like Figure 7 As shown, in some embodiments, along the first direction X, the first wall 11 has a third surface 111 facing the isolation member 30 and a fourth surface 112 facing away from the isolation member 30. The first wall 11 is provided with a second recess 113 recessed along the direction from the third surface 111 to the fourth surface 112. A pressure relief channel 101 is formed between the isolation member 30 and the second recess 113. The second recess 113 is provided with a pressure relief mechanism 40.

[0208] By providing a second recess 113 that is recessed inward on the side surface of the first wall 11 facing the separator 30, the separation structure 50 can be disposed between the second recess 113 and the separator 30, thereby improving the utilization rate of the internal space of the battery cell 1.

[0209] Optionally, the first wall 11 is provided with a second recess 113, and the spacer 30 is a plate-like structure.

[0210] For example, the isolation member 30 is provided with a first recess 33, the first wall 11 is provided with a second recess 113, and a pressure relief channel 101 is formed between the first recess 33 and the second recess 113.

[0211] The pressure relief channel 101 is formed between the second recess 113 and the isolator 30, which increases the size of the pressure relief channel 101 in the first direction X, thereby increasing the space for gas flow and improving the gas discharge rate during thermal runaway. Furthermore, by configuring it in this way, the pressure relief channel 101 can accommodate more gas, increasing the impact force of the gas on the pressure relief mechanism 40, enabling the pressure relief mechanism 40 to be actuated promptly and discharge gas smoothly.

[0212] Optionally, the shape and area of ​​the second recess 113 may be the same as or different from the shape of the first recess 33. For example, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first recess 33 falls into the orthographic projection plane of the second recess 113.

[0213] In some embodiments, along the first direction X, the second recess 113 protrudes from the fourth surface 112 on the side opposite to the spacer 30.

[0214] The second recess 113 can be formed on the first wall 11 by processes such as stamping or extrusion. During the formation of the second recess 113, the third surface 111 is recessed toward the fourth surface 112, and the fourth surface 112 protrudes toward the side away from the third surface 111 to form the second recess 113.

[0215] By setting it in the above manner, the influence of the second recess 113 on the strength of the first wall 11 can be reduced, thereby improving the reliability of the battery cell 1.

[0216] like Figure 9 As shown, in some embodiments, the angle between the extending direction A of the cover 51 and the first direction X is greater than or equal to 0° and less than or equal to 45°, and the periphery of the first recess 33 is provided with a through hole 301.

[0217] The separation structure 50 can be arranged in the pressure relief channel 101 at any of the above angles, which helps to improve the flexibility of the layout of the separation structure 50.

[0218] In some embodiments, the angle between the extending direction A of the cover 51 and the first direction X is greater than or equal to 0° and less than or equal to 10°.

[0219] By setting it in this way, the space occupied by the separation structure 50 in the pressure relief channel 101 can be reduced, thereby making the battery cell 1 more compact.

[0220] In some embodiments, the angle between the extending direction A of the cover 51 and the first direction X is 0°.

[0221] When the first direction X is vertical, the separation structure 50 can be placed vertically in the pressure relief channel 101. Along the first direction X, the separation structure 50 has an inlet 502 on its periphery, and the isolation member 30 has a through hole 301 on its periphery.

[0222] "The angle between the extension direction A of the cover 51 and the first direction X is 0°" means that the extension direction A of the cover 51 is set parallel to the first direction X. In this structure, the axis of the outlet 503 is set parallel to the first direction X. By setting it in this way, the distance between the high temperature gas discharged from the outlet 503 and the pressure relief mechanism 40 can be reduced, so as to better improve the release efficiency of the high temperature gas.

[0223] Please see Figure 6 and Figure 7 In some embodiments, the electrode assembly 20 includes a main body 21 and a first electrode tab 22 and a second electrode tab 23 connected to the main body 21. At least a portion of the first electrode tab 22 is disposed on one side of the first recess 33 along the second direction Y, and at least a portion of the second electrode tab 23 is disposed on the other side of the first recess 33 along the second direction Y. The first direction X intersects the second direction Y.

[0224] The second direction Y can be the arrangement direction of the first electrode 22 and the second electrode 23. This arrangement direction can be the length direction of the first wall 11 or the width direction of the first wall 11.

[0225] From the external shape of the electrode assembly 20, the electrode assembly 20 includes a main body 21 and a first electrode tab 22 and a second electrode tab 23 connected to the main body 21. The first electrode tab 22 can be defined as a positive electrode tab, and the second electrode tab 23 can be defined as a negative electrode tab. The first electrode tab 22 and the second electrode tab 23 can both extend from the same end of the main body 21, or they can extend from opposite ends of the main body 21, respectively. For example, both the first electrode tab 22 and the second electrode tab 23 extend from the end of the main body 21 near the insulating member 30.

[0226] The main body 21 is the core component of the electrode assembly 20, enabling its charging and discharging functions. The first tab 22 and the second tab 23 are used to draw out the current generated by the main body 21. The main body 21 includes a positive current collector for a positive current collector, a positive active material layer, a negative current collector for a negative current collector, a negative active material layer, and an insulating member 30. The first tab 22 may include multiple first tab 22 portions, and the second tab 23 may include multiple second tab 23 portions.

[0227] In the second direction Y, the spaces formed by the two sides of the first recess 33 and the second surface 32 of the separator 30 can be used to accommodate at least a portion of the electrode assembly 20. By setting it in the above manner, the space for arranging the electrode assembly 20 inside the housing 10 can be increased, so that the battery cell 1 has a larger electrode assembly 20, which is beneficial to improving the energy density of the battery cell 1. Alternatively, the size of the housing 10 can be reduced, so that the battery cell 1 can be designed more compactly, which is beneficial to improving the structural compactness of the battery cell 1, reducing the overall size of the battery cell 1, and thus reducing the space it occupies.

[0228] Furthermore, by setting it in the above manner, the electrode assembly 20 can be positioned closer to the through hole 301, allowing high-temperature gas to enter the separation chamber 501 more quickly through the through hole 301, thereby improving the efficiency of high-temperature gas release in the battery cell 1 during thermal runaway.

[0229] like Figure 6 As shown, in some embodiments, the battery cell 1 is further provided with two electrode terminals 60, which are used to electrically connect with the electrode assembly 20 for outputting or inputting electrical energy of the battery cell 1. One electrode terminal 60 is electrically connected to the first tab 22, and the other electrode terminal 60 is electrically connected to the second tab 23. The connection can be direct or indirect through a current collector.

[0230] For example, both electrode terminals 60 are disposed on the first wall 11, and the two electrode terminals 60 are spaced apart along the second direction Y, and the pressure relief mechanism 40 is disposed between the two electrode terminals 60.

[0231] like Figure 7 As shown, in some embodiments, the number of separation structures 50 is set to multiple.

[0232] This design improves the efficiency of high-temperature gas discharge, thereby improving the pressure relief efficiency of battery cell 1 and ultimately enhancing the reliability of battery cell 1 under extreme conditions.

[0233] Optionally, multiple separation structures 50 may be arranged around the pressure relief mechanism 40, and in the same projection plane perpendicular to the first direction X, the orthographic projection of the pressure relief mechanism 40 and the multiple separation structures 50 are completely offset.

[0234] like Figure 6 As shown, in some embodiments, the housing 10 includes a housing 110 and an end cap 120. The housing 110 has a receiving cavity 1102 and a housing opening 1101 communicating with the receiving cavity 1102. The end cap 120 covers the housing opening 1101 and includes a first wall 11.

[0235] By setting it in the above manner, it is convenient to process and form the pressure relief mechanism 40 on the end cover 120, or to assemble the pressure relief mechanism 40 on the end cover 120, thereby facilitating the processing and manufacturing of the outer casing 10 and the assembly of the outer casing 10, which helps to reduce the cost of the battery cell 1.

[0236] 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.

[0237] 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.

[0238] According to some embodiments of this application, this application also provides an energy storage device, 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.

[0239] 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.

[0240] 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.

[0241] 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.

[0242] Please refer to the following: Figures 6 to 9 According to some embodiments of this application, this application provides a battery cell 1, which includes a housing 10, an electrode assembly 20, a separator 30, and a separation structure 50. The housing 10 includes a shell 110 and an end cap 120. The shell 110 has a receiving cavity 1102 and a shell opening 1101 communicating with the receiving cavity 1102. The end cap 120 covers the shell opening 1101. The end cap 120 includes a first wall 11, wherein the first direction X is the thickness direction of the end cap 120, and the second direction Y is the length direction of the end cap 120.

[0243] The electrode assembly 20 is housed within the receiving cavity 1102 of the housing 10. The electrode assembly 20 includes a main body 21 and a first tab 22 and a second tab 23 connected to the main body 21. Along the first direction X, a spacer 30 is disposed on the side of the first wall 11 facing the electrode assembly 20. The spacer 30 has a first surface 31 facing the first wall 11 and a second surface 32 facing away from the first wall 11. The spacer 30 has a first recess 33 recessed along the direction from the first surface 31 to the second surface 32. The side of the first recess 33 facing away from the first wall 11 protrudes from the second surface 32. The first recess 33 has a through hole 301 communicating with the receiving cavity 1102. At least a portion of the first tab 22 is disposed on one side of the first recess 33 along the second direction Y, and at least a portion of the second tab 23 is disposed on the other side of the first recess 33 along the second direction Y.

[0244] Along the first direction X, the first wall 11 has a third surface 111 facing the isolation member 30 and a fourth surface 112 facing away from the isolation member 30. The first wall 11 is provided with a second recess 113 recessed along the direction from the third surface 111 to the fourth surface 112, and the side of the second recess 113 facing away from the isolation member 30 protrudes from the fourth surface 112. A pressure relief channel 101 is formed between the first recess 33 and the second recess 113. The second recess 113 is provided with a pressure relief mechanism 40, which is used to communicate with the pressure relief channel 101 in the pressure relief state.

[0245] A separation structure 50 is disposed in the pressure relief channel 101. The separation structure 50 includes a cover 51. The cover 51 has a third end wall 5003. The third end wall 5003 is connected to the second end wall 5002 and is disposed opposite to the first end wall 5001. The cover 51 extends in the direction from the third end wall 5003 to the first end wall 5001. Alternatively, the second end wall 5002 has an intersection point 5004 and an opening 5005 disposed opposite to each other. The first end wall 5001 is disposed in the opening 5005. The cover 51 extends in the direction from the intersection point 5004 to the first end wall 5001. The extension direction A of the cover 51 intersects the axis of the inlet 502.

[0246] The cover 51 has a circular cross-section perpendicular to its extension direction A. The cover 51 includes a first cover 511 and a second cover 512 coaxially arranged and enclosing a separation cavity 501. The separation cavity 501 has a circular cross-section perpendicular to its extension direction A, and the circumference of the separation cavity 501 is the same as that of the cover 51. Along the extension direction A of the cover 51, the first cover 511 is connected to the side of the second cover 512 facing the pressure relief mechanism 40. The first cover 511 has a first end wall 5001 surrounding the side of the separation cavity 501 facing the pressure relief mechanism 40 along the extension direction A. The first cover 511 also has a first sub-end wall 5021 connected to the first end wall 5001. The second cover 512 has a second sub-end wall 5022 connected to the first sub-end wall 5021. The first sub-end wall 5021 and the second sub-end wall 5022 are both surrounding the periphery of the separation cavity 501. The first end wall 5001 is provided with an outlet 503. The axis of the outlet 503 is parallel to the extension direction A of the cover 51. The pressure relief channel 101 is connected to the separation cavity 501 through the outlet 503. The first sub-end wall 5021 is provided with an inlet 502. The axis of the inlet 502 intersects the extension direction A of the cover 51. The axis of the inlet 502 is also tangent to the circumferential direction of the cover 51. The inlet 502 corresponds to and is coaxially arranged with the through hole 301. The receiving cavity 1102 and the separation cavity 501 are connected through the through hole 301 and the inlet 502. The pressure relief channel 101 is connected to the separation cavity 501 through the outlet 503.

[0247] The first cover 511 is a cylindrical structure, and the second cover 512 is a conical or frustum structure. Along the extension direction A of the cover 51, the first cover 511 has a first end 5111 and a second end 5112, and the second cover 512 has a third end 5121 and a fourth end 5122. The third end 5121 is connected to the second end 5112. The cross-sectional dimension of the second end 5112 perpendicular to the extension direction A is equal to the cross-sectional dimension of the first end 5111 perpendicular to the extension direction A. The cross-sectional dimension of the third end 5121 perpendicular to the extension direction A is equal to the cross-sectional dimension of the second end 5112 perpendicular to the extension direction A. The cross-sectional dimension of the fourth end 5122 perpendicular to the extension direction A is smaller than the cross-sectional dimension of the third end 5121 perpendicular to the extension direction A.

[0248] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0249] 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 casing has a first wall, and the first wall is provided with a pressure relief mechanism; The electrode assembly is housed within the receiving cavity of the housing; An isolator is disposed on the side of the first wall facing the electrode assembly along a first direction, and a pressure relief channel is formed between the isolator and the first wall. The pressure relief mechanism is used to communicate with the pressure relief channel in a pressure-relieved state. The isolator is provided with a through hole communicating with the receiving cavity. A separation structure is provided in the pressure relief channel. The separation structure includes a cover, the cover having a separation cavity, the cover having an inlet and an outlet, the axis of the inlet intersecting the axis of the outlet, the inlet corresponding to the through hole, the receiving cavity and the separation cavity being connected through the through hole and the inlet, and the pressure relief channel and the separation cavity being connected through the outlet.

2. The battery cell according to claim 1, characterized in that, The housing has a first end wall and a second end wall connected to each other. The first end wall surrounds the separation cavity on the side facing the pressure relief mechanism, and the second end wall surrounds the periphery of the separation cavity. The first end wall has the outlet, and the second end wall has the inlet.

3. The battery cell according to claim 2, characterized in that, The cover has a third end wall connected to the second end wall and disposed opposite to the first end wall. The cover extends along the direction from the third end wall to the first end wall. Alternatively, the second end wall has an intersection point and an opening disposed opposite to each other, the first end wall is disposed at the opening, and the cover extends along the direction from the intersection point to the first end wall. The extending direction of the cover intersects the axis of the inlet. The separation cavity has a circular cross-section perpendicular to the extension direction of the cover, and / or the cover has an annular cross-section perpendicular to its extension direction.

4. The battery cell according to claim 3, characterized in that, The separation cavity is at least one of a cylindrical, conical, and frustum-shaped structure, and / or the cover is at least one of a cylindrical, conical, and frustum-shaped structure.

5. The battery cell according to claim 3, characterized in that, Along the extending direction of the housing, the cross-sectional dimension of the separation chamber on the side near the pressure relief mechanism, perpendicular to the extending direction of the housing, is greater than the cross-sectional dimension on the side away from the pressure relief mechanism, perpendicular to the extending direction of the housing.

6. The battery cell according to claim 5, characterized in that, The axis of the inlet is tangent to the circumferential direction of the separation chamber, and / or the axis of the inlet is tangent to the circumferential direction of the cover; and / or the through hole is coaxially arranged with the inlet.

7. The battery cell according to claim 6, characterized in that The battery cell also includes an inlet pipe, the extension direction of which is tangent to the circumferential direction of the separation cavity, and / or, the extension direction of which is tangent to the circumferential direction of the cover. The inlet pipe is connected to the side of the isolation member facing the receiving cavity and communicates with the through hole; and / or, the inlet pipe is connected between the cover and the isolation member and communicates with the inlet and the through hole; And / or, the separation structure further includes an outlet pipe connected to the side of the housing along its extension direction near the pressure relief mechanism, and communicating the outlet with the pressure relief mechanism.

8. The battery cell according to claim 5, characterized in that, The housing includes a first housing and a second housing arranged coaxially. Along the extending direction of the housing, the first housing is connected to the side of the second housing facing the pressure relief mechanism. The first housing is provided with the inlet and the outlet. Along the extending direction of the cover, the first cover has a first end and a second end opposite to each other, and the second cover has a third end and a fourth end opposite to each other. The third end is connected to the second end. The cross-sectional dimension of the second end perpendicular to the extending direction of the cover is less than or equal to the cross-sectional dimension of the first end perpendicular to the extending direction of the cover. The cross-sectional dimension of the third end perpendicular to the extending direction of the cover is equal to the cross-sectional dimension of the second end perpendicular to the extending direction of the cover. The cross-sectional dimension of the fourth end perpendicular to the extending direction of the cover is less than the cross-sectional dimension of the third end perpendicular to the extending direction of the cover.

9. The battery cell according to claim 3, characterized in that, The angle between the extending direction of the cover and the first direction is greater than 45° and less than or equal to 90°.

10. The battery cell according to claim 9, characterized in that, The angle between the extending direction of the cover and the first direction is 90°, and the through hole is provided on the side of the isolation member opposite to the first wall along the first direction.

11. The battery cell according to claim 3, characterized in that, Along the first direction, the isolation member has a first surface facing the first wall and a second surface facing away from the first wall. The isolation member is provided with a first recessed portion recessed in the direction from the first surface to the second surface. The pressure relief channel is formed between the first wall and the first recessed portion. The first recessed portion is provided with the through hole.

12. The battery cell according to claim 11, characterized in that, Along the first direction, the first recess protrudes from the second surface on the side opposite to the first wall.

13. The battery cell according to claim 12, characterized in that, The angle between the extending direction of the cover and the first direction is greater than or equal to 0° and less than or equal to 45°, and the through hole is provided on the periphery of the first recess.

14. The battery cell according to claim 12, characterized in that, The electrode assembly includes a main body and a first electrode tab and a second electrode tab connected to the main body. At least a portion of the first electrode tab is disposed on one side of the first recess along a second direction, and at least a portion of the second electrode tab is disposed on the other side of the first recess along a second direction. The first direction intersects the second direction.

15. The battery cell according to any one of claims 1 to 14, characterized in that, Along the first direction, the first wall has a third side facing the isolator and a fourth side facing away from the isolator. The first wall is provided with a second recessed portion recessed in the direction from the third side to the fourth side. The pressure relief channel is formed between the isolator and the second recessed portion. The second recessed portion is provided with the pressure relief mechanism.

16. The battery cell according to claim 15, characterized in that, Along the first direction, the second recess protrudes from the fourth surface on the side opposite to the spacer.

17. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1 to 16.

18. An energy storage device, characterized in that, It includes a plurality of battery cells according to any one of claims 1 to 16 or a plurality of battery devices according to claim 17, wherein the battery cells or the battery devices are used to store or provide electrical energy.

19. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device as described in claim 18, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

20. A charging network, characterized in that, It includes a charging pile and an energy storage device as described in claim 18 or an energy storage system as described in claim 19, wherein the energy storage device is used to provide electrical energy to the charging pile.

Images