Battery monomer, battery device, energy storage device and power utilization device

Abstract

The utility model discloses a battery monomer, a battery device, an energy storage device and a power utilization device. Wherein the battery monomer comprises an electrode assembly and a shell for accommodating the electrode assembly, the shell is provided with an opening along a first direction, and an end cover seals the opening; the end cover is provided with a pressure relief part, and the pressure relief part is configured to be capable of releasing the internal pressure of the battery monomer; the shell is further provided with a shell wall, the side, facing the electrode assembly, of the shell wall is provided with a first face, the side, facing the shell wall, of the electrode assembly is provided with a second face, the first face or the second face is provided with protruding parts protruding in the thickness direction of the shell wall, the protruding parts abut against the first face or the second face, and the protruding parts are arranged in the circumferential direction of the electrode assembly at intervals. Through the application, the gap supported by the convex part can be formed between the shell wall and the electrode assembly, and emissions can reach the pressure relief part of the end cover from the gap supported by the convex part, so that the risk of fire and explosion caused by unsmooth pressure relief during thermal runaway of the single battery is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery cells, battery devices, energy storage devices, and power consumption devices. Background Technology

[0002] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0003] In battery-powered new energy vehicles, batteries can provide all or part of the power. In the field of energy storage, batteries can be installed in energy storage enclosures or directly on the user side. In these application scenarios, a common problem is that individual battery cells may experience poor pressure relief when their internal pressure reaches a threshold. Therefore, improving the pressure relief capability of individual battery cells is one of the industry's research and development challenges. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a battery cell, a battery device, an energy storage device, and an electrical device.

[0005] This application is achieved through the following technical solution.

[0006] A first aspect of this application discloses a battery cell, including an electrode assembly and a housing housing the electrode assembly. The housing has an opening along a first direction, and an end cap closes the opening. The end cap is provided with a pressure relief portion configured to release the internal pressure of the battery cell. The housing also has a housing wall, the housing wall having a first surface facing the electrode assembly, and the electrode assembly having a second surface facing the housing wall.

[0007] The first surface and / or the second surface are provided with protrusions that rise along the thickness direction of the housing wall, the protrusions abutting against the first surface and / or the second surface, and the protrusions are spaced apart circumferentially along the electrode assembly.

[0008] Therefore, a gap supported by the protrusion can be formed between the casing wall and the electrode assembly, preventing the electrode assembly from getting too close to the casing wall and ensuring a certain space between them. When the internal pressure of the battery cell reaches a threshold, such as during thermal runaway, the high-temperature, high-pressure material inside the battery cell will be discharged through the gap supported by the protrusion to the end cap. The internal pressure of the battery cell is then released through the pressure relief section located on the end cap, thereby reducing the risk of fire or explosion of the battery cell due to insufficient pressure relief during thermal runaway.

[0009] In addition, since the protrusions are spaced apart along the circumference of the electrode assembly, a pressure relief channel with a certain width can be formed between the protrusions, which can improve the pressure relief capacity of the battery cell to a certain extent, reduce the risk that the battery cell cannot smoothly release gas and pressure, and further improve the pressure relief capacity.

[0010] In some embodiments, the protrusion extends continuously along the first direction.

[0011] Since the protrusion extends continuously along the first direction, it can form a pressure relief channel that extends continuously along the first direction, which is beneficial to guide the emissions to the pressure relief part along the first direction for release, and further reduces the risk that the battery cells cannot smoothly release gas and pressure.

[0012] In some embodiments, the number of protrusions along the circumferential direction of the electrode assembly does not exceed six.

[0013] Therefore, the number of protrusions in the circumferential direction of the electrode assembly is within a suitable range, which can balance the pressure relief effect of the formed gap with the internal space utilization of the battery cell.

[0014] In some embodiments, the spacing between adjacent protrusions is the same along the circumferential direction of the electrode assembly.

[0015] Because the spacing between adjacent protrusions is the same, the pressure relief channels can be evenly distributed around the circumference of the electrode assembly, reducing the risk of the pressure relief channels being affected by uneven protrusion placement or displacement.

[0016] In some embodiments, the protrusion extends continuously in a spiral shape around the first direction.

[0017] Since the protrusion extends continuously in a spiral shape around the first direction, a pressure relief channel that extends continuously in a spiral shape along the first direction can be formed, which is beneficial to guide the emissions to the pressure relief part along the first direction for release, and further reduces the risk that the battery cells cannot smoothly release gas and pressure.

[0018] In some embodiments, the plurality of protrusions are arranged at intervals along a first direction.

[0019] Since multiple protrusions are arranged at intervals along the first direction, pressure relief channels can be formed in both the first direction and the circumferential direction of the electrode assembly. This helps to guide the emissions along the first direction to the pressure relief section for release, further reducing the risk that the battery cells cannot smoothly release pressure.

[0020] In some embodiments, adjacent protrusions are staggered relative to each other in the circumferential direction of the electrode assembly.

[0021] Therefore, the protrusion position can be reasonably designed to improve the space utilization of the battery cell, and it also helps to alleviate the stress accumulation and stress concentration of the electrode assembly during the battery cell cycle, so that the generated stress can be evenly distributed, thereby reducing the problem of local deformation of the shell due to stress concentration.

[0022] In some embodiments, the projection of the protrusion onto a projection plane perpendicular to the thickness direction of the housing wall is along the thickness direction of the housing wall, and the projection of the protrusion is circular.

[0023] Therefore, the obstruction effect of the protrusion on emissions can be reduced to a certain extent, thus avoiding affecting the smooth pressure relief of battery cells through the gap.

[0024] In some embodiments, the protrusion is an elastic insulating element.

[0025] Since the protrusion is an elastic insulating part, it can separate the housing wall from the electrode assembly, thereby achieving insulation between the housing and the electrode assembly. At the same time, the elastic protrusion can also facilitate the assembly of the electrode assembly into the housing.

[0026] In some embodiments, the battery cell is a cylindrical battery.

[0027] This helps to release internal pressure in cylindrical batteries, reducing the risk of fire and explosion due to poor pressure release during thermal runaway.

[0028] In some embodiments, the outer periphery of the electrode assembly is covered with an insulating film, the insulating film having a second surface, and the protrusion is disposed on the second surface and abuts against the first surface.

[0029] Since the insulating film is wrapped around the outer peripheral surface of the electrode assembly, it can insulate and isolate the electrode assembly from the housing, further improving the insulation performance of the electrode assembly. The protrusion on the second surface is conducive to the assembly of the electrode assembly.

[0030] In some embodiments, the projection of the protrusion onto a projection plane perpendicular to the first direction is along the first direction, and the projection of the protrusion is a semi-circular shape.

[0031] Therefore, the shape of the protrusion helps to create a gap between the electrode assembly and the housing wall, further improving the support effect of the protrusion.

[0032] In some embodiments, the protrusion is disposed on the first surface, and the shape of the protrusion on the side away from the first surface along the thickness direction of the housing wall matches the outer peripheral surface of the electrode assembly.

[0033] Therefore, the shape of the protrusion facilitates the assembly of the electrode assembly into the housing, further enhancing the support effect of the protrusion.

[0034] In some embodiments, along the first direction, the ratio of the sum of the lengths of the protrusions to the length of the electrode assembly is not less than 0.3 and not more than 1.

[0035] Therefore, the length of the protrusion is within a suitable range, which can balance the pressure relief effect of the formed gap with the internal space utilization of the battery cell.

[0036] In some embodiments, the height of the protrusion is between 0.1 and 2 mm along the thickness direction of the housing wall.

[0037] Therefore, the height of the protrusion is within a suitable range, which can balance the pressure relief effect of the formed gap with the internal space utilization of the battery cell.

[0038] The second aspect of this application discloses a battery device including a plurality of battery cells as described in the first aspect of this application.

[0039] Since the battery device includes the battery cells described in the first aspect of the present application, it is beneficial for the battery device to release pressure when thermal runaway occurs, thereby improving the pressure release performance and operational reliability of the battery device.

[0040] A third aspect of this application discloses an energy storage device, including multiple battery cells as described in the first aspect of this application or multiple battery devices as described in the second aspect of this application, wherein the battery cells or the battery devices are used to store or provide electrical energy.

[0041] Since the energy storage device includes the battery cell described in the first aspect of the embodiments of this application or the battery device described in the second aspect of the embodiments of this application, it is beneficial for the energy storage device to release pressure when battery thermal runaway occurs, thereby improving the pressure release performance and operational reliability of the energy storage device.

[0042] The fourth aspect of this application discloses an electrical device, including a battery cell as described in the first aspect of this application, a battery device as described in the second aspect of this application, or an energy storage device as described in the third aspect of this application, wherein the battery cell or the battery device is used to store or provide electrical energy.

[0043] Since the electrical device includes the battery cell described in the first aspect of the present application, the battery device described in the second aspect of the present application, or the energy storage device described in the third aspect of the present application, it is beneficial for the electrical device to release pressure when battery thermal runaway occurs, thereby improving the pressure release performance and operational reliability of the electrical device.

[0044] The beneficial effects of the embodiments of this application include: through this application, a gap supported by a protrusion can be formed between the housing wall and the electrode assembly, and the effluent can quickly reach the pressure relief part of the end cap from the gap supported by the protrusion, thereby reducing the risk of fire and explosion of the battery cell due to poor pressure relief during thermal runaway. Attached Figure Description

[0045] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0046] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0047] Figure 2 Schematic diagrams of the battery device provided for some embodiments of this application;

[0048] Figure 3 Schematic diagrams of the structure of a battery cell provided for some embodiments of this application;

[0049] Figure 4 Schematic diagrams of the internal structure of a battery cell provided for some embodiments of this application;

[0050] Figure 5 Partial schematic diagram of the insulating film provided for some embodiments of this application;

[0051] Figure 6 for Figure 5 Sectional view at point AA;

[0052] Figure 7 Partial schematic diagram of the insulating film provided for other embodiments of this application;

[0053] Figure 8 for Figure 7 Sectional view at point BB;

[0054] Figure 9 A partial schematic diagram of another insulating film provided in an embodiment of this application;

[0055] Figure 10 Schematic diagrams of the internal structure of a battery cell provided for other embodiments of this application;

[0056] Figure 11 for Figure 10 A partial schematic diagram of the insulating film in the middle;

[0057] Figure 12A schematic diagram of the internal structure of a battery cell provided for further embodiments of this application;

[0058] Figure 13 Schematic diagrams showing the location of the pressure relief section provided for some embodiments of this application;

[0059] Figure 14 Partial schematic diagram of an insulating film provided for further embodiments of this application;

[0060] Figure 15 A schematic diagram of the structure of an energy storage device provided for some embodiments of this application.

[0061] Explanation of reference numerals in the attached figures

[0062] 1-Battery cell, 2-Housing, 2A-Opening, 2B-Housing wall, 3-Electrode assembly, 4-End cap, 4A-Electrode terminal, 5-Pressure relief section, 6-First surface, 7-Second surface, 8-Protrusion, 9-Insulating film, 10-Pressure relief channel, 100-Battery assembly, 101-Box, 102-Cover, 103-Base plate, 1000-Vehicle, 2000-Energy storage device. Detailed Implementation

[0063] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0065] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0066] In this document, the term "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 throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0067] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0068] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0069] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0070] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0071] The following is a detailed description of this application.

[0072] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0073] In many applications, battery cells often experience poor pressure relief when their internal pressure reaches a threshold. Therefore, improving the pressure relief capability of individual battery cells is a key research topic in the industry.

[0074] Through research and design, a gap supported by protrusions is designed between the casing wall of the battery cell and the electrode assembly, which can improve the pressure relief capacity of the battery cell and reduce the risk of poor pressure relief.

[0075] Based on this design concept, this application designs a battery cell, which includes an electrode assembly and a housing that houses the electrode assembly. The housing has an opening along a first direction, and an end cap closes the opening. The end cap is provided with a pressure relief section, which is configured to release the internal pressure of the battery cell. The housing also has a housing wall, which has a first surface on the side facing the electrode assembly and a second surface on the side facing the housing wall. The first surface and / or the second surface are provided with protrusions that rise along the thickness direction of the housing wall. The protrusions abut against the first surface and / or the second surface, and the protrusions are spaced apart circumferentially along the electrode assembly.

[0076] Therefore, a gap supported by the protrusion can be formed between the casing wall and the electrode assembly, preventing the electrode assembly from getting too close to the casing wall and ensuring a certain space between them. When the internal pressure of the battery cell reaches a threshold, such as during thermal runaway, the high-temperature, high-pressure material inside the battery cell will be discharged through the gap supported by the protrusion to the end cap. The internal pressure of the battery cell is then released through the pressure relief section located on the end cap, thereby reducing the risk of fire or explosion of the battery cell due to insufficient pressure relief during thermal runaway.

[0077] In addition, since the protrusions are spaced apart circumferentially along the electrode assembly, a pressure relief channel with a certain width can be formed between the protrusions, which can reduce the risk of the battery cells not being able to release pressure smoothly to a certain extent and further improve the pressure relief capacity.

[0078] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this application. The description is as follows with reference to the accompanying drawings.

[0079] Figure 1The diagram illustrates the structure of a vehicle 1000 as provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Figure 1 As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0080] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0081] Figure 2 This is an exploded perspective view of the battery device 100 provided in an embodiment of this application. Figure 2 As shown, the battery device 100 includes a base plate 103, a cover 102 and at least one battery cell 1. The cover 102 covers the base plate 103, thereby forming a space for accommodating the battery cell 1 between the base plate 103 and the cover 102.

[0082] In this embodiment of the application, the battery cell 1 can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0083] The battery cell 1 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.

[0084] Although not illustrated, a single battery cell 1 generally includes an electrode assembly 3. The electrode assembly 3 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the single 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, prevents short circuits while allowing active ions to pass through.

[0085] In some embodiments, the electrode assembly 3 is provided with tabs (not shown) that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0086] In some embodiments, the battery cell 1 may include a housing. The housing is used to encapsulate components such as the electrode assembly 3 and the electrolyte. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0087] As an example, the battery cell 1 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0088] In some embodiments, such as Figure 3 As shown, the outer casing includes a housing 2 and an end cap 4. The housing 2 has an opening 2A, and the end cap 4 closes the opening to form a sealed space for accommodating electrode components and electrolytes. The housing 2 may have one or more openings 2A. The end cap 4 may also have one or more.

[0089] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, it serves to protect the electrode assembly 3, and a sealing bag is included between the housing and the electrode assembly 3 to encapsulate the electrode assembly 3 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film.

[0090] In some embodiments, such as Figure 3 As shown, the outer casing is provided with at least one electrode terminal 4A, which is electrically connected to a tab (not shown). The electrode terminal 4A can be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal 4A can be provided on the end cover 4 or on the housing 2.

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

[0092] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0093] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0094] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0095] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0096] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0097] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0098] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0099] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0100] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0101] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0102] Below, refer to Figures 3 to 15 Some embodiments of this application will be described in detail.

[0103] Figure 3Schematic diagrams of the structure of a battery cell provided for some embodiments of this application; Figure 4 Schematic diagrams of the internal structure of a battery cell provided for some embodiments of this application; Figure 5 Partial schematic diagram of the insulating film provided for some embodiments of this application; Figure 6 for Figure 5 Sectional view at point AA; Figure 7 Partial schematic diagram of the insulating film provided for other embodiments of this application; Figure 8 for Figure 7 Sectional view at point BB; Figure 9 A partial schematic diagram of another insulating film provided in an embodiment of this application; Figure 10 Schematic diagrams of the internal structure of a battery cell provided for other embodiments of this application; Figure 11 for Figure 10 A partial schematic diagram of the insulating film in the middle; Figure 12 A schematic diagram of the internal structure of a battery cell provided for further embodiments of this application; Figure 13 Schematic diagrams showing the location of the pressure relief section provided for some embodiments of this application; Figure 14 Partial schematic diagram of an insulating film provided for further embodiments of this application; Figure 15 A schematic diagram of the structure of an energy storage device provided for some embodiments of this application.

[0104] In some embodiments of this application, for ease of explanation, a first direction, a thickness direction of the housing wall, and a circumferential direction of the electrode assembly are defined, wherein the first direction intersects the thickness direction of the housing wall. For example... Figures 3 to 14 As shown by the arrows, the first direction is perpendicular to the thickness direction of the housing wall. The direction where arrow X is located is the thickness direction of the housing wall, the direction where arrow W is located is the circumferential direction of the electrode assembly, and the direction where arrow Z is located is the first direction.

[0105] The first aspect of this application discloses a battery cell 1, such as... Figure 3 As shown, the battery cell 1 includes an electrode assembly 3 and a housing 2 that houses the electrode assembly 3. The housing 2 has an opening 2A along a first direction (Z), and an end cap 4 closes the opening 2A. The end cap 4 is provided with a pressure relief part 5, which is configured to release the internal pressure of the battery cell 1. The housing 2 also has a housing wall 2B. The housing wall 2B has a first surface 6 on the side facing the electrode assembly 3, and the electrode assembly 3 has a second surface 7 on the side facing the housing wall 2B. The first surface 6 and / or the second surface 7 are provided with protrusions 8 that rise along the thickness direction (X) of the housing wall 2B. The protrusions 8 abut against the first surface and / or the second surface, and the protrusions 8 are spaced apart along the circumferential direction (W) of the electrode assembly.

[0106] In the embodiments of this application, the housing 2 has an internal accommodating space, and the electrode assembly 3 is disposed in the accommodating space.

[0107] In the embodiments of this application, the electrode assembly 3 is the component in the battery cell 1 where the electrochemical reaction occurs. The housing 2 may contain one or more electrode assemblies 3. The electrode assembly 3 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery cell 1, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 4A to form a current loop.

[0108] In the embodiments of this application, the shape of the housing 2 can be determined according to the specific shape of the electrode assembly 3. For example, if the electrode assembly 3 is a cylindrical structure, a cylindrical housing 2 can be selected; if the electrode assembly 3 is a cuboid structure, a cuboid housing 2 can be selected.

[0109] In embodiments of this application, the housing 2 may have one opening 2A or multiple openings 2A along the first direction (Z). For example, as shown... Figure 3 As shown, the housing 2 may have one opening 2A along the first direction (Z). Alternatively, the housing 2 may have two openings 2A along the first direction (Z). The two openings 2A may have the same shape and size, or they may be different; this application does not limit this.

[0110] In a specific embodiment, the end cap 4 closes the opening 2A, and the number of end caps 4 and openings 2A can be the same. For example, as shown... Figure 3 As shown, the end cap 4 has the same shape as the opening 2A, which closes the opening 2A of the housing 2.

[0111] In the embodiments of this application, the end cap 4 is provided with a pressure relief section 5, which can release the internal pressure of the battery cell 1.

[0112] In the embodiments of this application, the pressure relief part 5 can be an explosion-proof valve structure, which flips and releases pressure when the internal pressure is high; the pressure relief part 5 can also be a grooved structure, which breaks and releases pressure when the internal pressure is high. The pressure relief part 5 can also be other structures. This application does not limit the specific structure of the pressure relief part 5.

[0113] Optionally, a single end cap 4 may be provided with one or more pressure relief sections 5.

[0114] Optionally, the battery cell 1 has multiple end caps 4, and pressure relief parts 5 may be provided on multiple end caps 4 or on only one end cap 4.

[0115] For example, such as Figure 3 As shown, the battery cell 1 has an end cap 4, and the end cap 4 is provided with a pressure relief section 5.

[0116] For example, such as Figure 13 As shown, the battery cell 1 has two end caps 4, one of which is provided with a pressure relief section 5.

[0117] In the embodiments of this application, such as Figure 13 As shown, the pressure relief section 5 is connected to the gap.

[0118] When thermal runaway occurs in battery cell 1, the gas can flow rapidly from the gas-generating area through the gap to the pressure relief section 5 and be discharged from the pressure relief section 5 in a timely manner, improving the reliability of battery cell 1. At the same time, timely pressure relief is less likely to affect other battery cells 1 in the vicinity, thus preventing the spread of thermal runaway and making battery cell 1 more stable.

[0119] In the embodiments of this application, the housing 2 includes a housing wall 2B, which surrounds and forms the housing 2, and forms an internal space for accommodating the electrode assembly 3, electrolyte, etc.

[0120] In the embodiments of this application, the housing wall 2B may be the side wall of the battery cell 1.

[0121] In the embodiments of this application, the housing wall 2B has a first surface 6 on the side facing the electrode assembly 3, and the electrode assembly 3 has a second surface 7 on the side facing the housing wall 2B. Either the first surface 6 or the second surface 7 is provided with a plurality of protrusions 8 that rise along the thickness direction (X) of the housing wall 2B, and the protrusions 8 abut against the other one.

[0122] Optionally, the protrusion 8 may be disposed on the first surface 6 of the housing wall 2B and abut against the second surface 7 of the electrode assembly 3, forming a gap between the first surface 6 and the second surface 7.

[0123] Optionally, the protrusion 8 may be disposed on the second surface 7 of the electrode assembly 3, abutting against the first surface 6 of the housing wall 2B, forming a gap between the first surface 6 and the second surface 7.

[0124] Optionally, the protrusion 8 can be disposed on the first surface 6 and the second surface 7, with the protrusion 8 disposed on the first surface 6 abutting against the second surface 7, and the protrusion 8 disposed on the second surface 7 abutting against the first surface 6.

[0125] Understandably, the protrusion 8 is positioned between the first surface 6 and the second surface 7, creating a certain space between the electrode assembly 3 and the housing wall 2B. Simultaneously, the gap formed between the first surface 6 and the second surface 7 allows the discharge material to pass through, facilitating its passage to the pressure relief section 5 for pressure release.

[0126] In addition, during battery charge and discharge cycles, as the number of cycles increases, the electrode assembly 3 will expand to a certain extent, which reduces the gap between the electrode assembly 3 and the housing wall 2B, i.e., between the first surface 6 and the second surface 7. The protrusion 8 provided between the first surface 6 and the second surface 7 can also prevent the electrode assembly 3 and the housing wall 2B from getting close to each other, and provide support in the thickness direction (X) of the housing wall 2B, reducing the risk of poor pressure relief caused by the expansion of the electrode assembly 3.

[0127] In the embodiments of this application, the projection of the protrusion 8 onto the projection surface perpendicular to the first direction is along the first direction (Z). The projection shape of the protrusion 8 can be a circle, a semicircle, an ellipse, a triangle, a quadrilateral or other polygons. The shape of the protrusion 8 can be set to match the shape of the first surface 6 or the shape of the second surface 7, or it can be not set to match.

[0128] In the embodiments of this application, the protrusion 8 can be an integrally formed component or a split-formed component. When the protrusion 8 is a split-formed component, the materials of the split parts can be the same or different.

[0129] Optionally, when the protrusion 8 is provided on the first surface 6, the protrusion 8 can be integrally formed with the housing wall 2B, or it can be provided on the first surface 6 of the housing wall 2B by means of fixed connection.

[0130] Alternatively, when the protrusion 8 is disposed on the second surface 7, the protrusion 8 can be integrally formed with the electrode assembly 3, or it can be disposed on the second surface 7 of the electrode assembly 3 by means of fixed connection.

[0131] In the embodiments of this application, the protrusions 8 are spaced apart along the circumferential direction (W) of the electrode assembly 3. It can be understood that the gap between adjacent protrusions 8 is equivalent to the pressure relief channel 10, which allows the discharge material to pass through. This is beneficial to improve the pressure relief capability of the battery cell 1 to a certain extent and reduce the risk that the battery cell 1 cannot smoothly discharge and relieve pressure.

[0132] In addition, the protrusions 8 spaced apart along the circumferential direction (W) can provide support for the electrode assembly 3 in multiple directions, which is beneficial to stabilizing the electrode assembly 3, improving the working reliability of the battery cell 1, and also facilitating the assembly of the electrode assembly 3.

[0133] Therefore, a gap supported by the protrusion 8 can be formed between the housing wall 2B and the electrode assembly 3, preventing the electrode assembly 3 and the housing wall 2B from getting too close to each other, thus providing a certain space between the electrode assembly 3 and the housing wall 2B. When the internal pressure of the battery cell 1 is too high, such as in the event of thermal runaway, the high-temperature and high-pressure substances (such as gas) inside the battery cell 1 will be released as exhaust material from the gap supported by the protrusion 8 to the end cap 4. The internal pressure of the battery cell 1 is released by the pressure relief part 5 provided on the end cap 4, thereby reducing the risk of fire and explosion of the battery cell 1 due to poor pressure relief during thermal runaway.

[0134] In the embodiments of this application, along the first direction (Z), the ratio of the sum of the lengths of the protrusions 8 to the length of the electrode assembly 3 is not less than 0.3 and not more than 1.

[0135] Optionally, the protrusions 8 may extend continuously along the first direction (Z), and the sum of the lengths of the protrusions 8 is the length of the protrusions 8. For example, as shown... Figure 5 As shown, the length L of the protrusion 8 can be equal to the length H of the electrode assembly 3. Furthermore, exemplarily, as... Figure 13 As shown, the length L of the protrusion 8 can be less than the length H of the electrode assembly 3.

[0136] Alternatively, the plurality of protrusions 8 may be arranged at intervals along a first direction (Z). For example, as shown... Figure 7 As shown, along the first direction (Z), the sum of the lengths of the protrusions 8 is the sum of the lengths L1 of the plurality of protrusions 8.

[0137] For example, the ratio of the sum of the lengths of the protrusions 8 to the length of the electrode assembly 3 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1, and other values ​​are not listed in this application.

[0138] Therefore, the length of the protrusion is within a suitable range, which can balance the pressure relief effect of the formed gap with the internal space utilization of the battery cell.

[0139] In the embodiments of this application, such as Figure 6 , Figure 8 As shown, along the thickness direction (X) of the shell wall 2B, the height h of the protrusion 8 is between 0.1 and 2 mm.

[0140] For example, the height h of the protrusion 8 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2.0mm. Other values ​​are not listed in this application.

[0141] In the embodiments of this application, in the same battery cell 1, the height h of multiple protrusions 8 may be the same or different.

[0142] It is understood that, in the embodiments of this application, the height h of the protrusion 8 refers to the longest distance of the protrusion 8 along the thickness direction (X) of the housing wall 2B.

[0143] It is understandable that the larger the size of the battery cell 1 along the first direction (Z), the higher the height h of the protrusion 8, and the larger the gap formed, which is beneficial to adapting to the energy density and pressure relief requirements of different models of battery cells 1.

[0144] Therefore, the height h of the protrusion 8 is within a suitable range, which can balance the pressure relief effect of the formed gap with the internal space utilization of the battery cell 1.

[0145] In the embodiments of this application, the battery cell 1 is a cylindrical battery.

[0146] In a specific embodiment, by setting the battery cell 1 to a cylindrical shape, it is easier to process the battery cell 1 into a cylindrical structure, so that the battery cell 1 has advantages such as high capacity, long cycle life and wide operating temperature range.

[0147] This helps to release internal pressure in cylindrical batteries, reducing the risk of fire and explosion due to poor pressure release during thermal runaway.

[0148] In the embodiments of this application, such as Figure 4 , Figure 10 As shown, the outer periphery of the electrode assembly 3 is covered with an insulating film 9, the insulating film 9 has a second surface 7, and a protrusion 8 is disposed on the second surface 7 and abuts against the first surface 6.

[0149] Optionally, the insulating film 9 may be made of polyester insulating materials such as polypropylene, polycarbonate, and polyethylene terephthalate.

[0150] For example, the protrusion 8 can be disposed on the second surface 7 of the insulating film 9, which is the side of the insulating film 9 close to the housing wall 2B along the thickness direction (X). The insulating film 9 and the protrusion 8 can be connected by heat fusion to improve the connection stability between the insulating film 9 and the protrusion 8.

[0151] In a specific embodiment, as shown in the figure, the insulating film 9 covers the outer peripheral surface of the electrode assembly 3, which can insulate and isolate the electrode assembly 3 from the housing 2, further improving the insulation performance of the electrode assembly 3 and reducing the risk of impurities falling off the electrode assembly 3 overlapping the electrode assembly 3 and the housing 2.

[0152] In the embodiments of this application, such as Figure 5 As shown, the protrusion 8 extends continuously along the first direction (Z).

[0153] It is understandable that the protrusion 8 can be provided on the first surface 6 of the housing wall 2B or the second surface 7 of the electrode assembly 3.

[0154] For example, such as Figure 5 As shown, the protrusion 8 is provided on the second surface 7 and extends in the first direction (Z).

[0155] For example, such as Figure 6 As shown, the height h of the multiple protrusions 8 is the same, which makes the central axis of the housing 2 and the electrode assembly 3 the same, reducing the difficulty of processing and assembly.

[0156] Since the protrusion 8 extends continuously along the first direction (Z), a pressure relief channel 10 extending continuously along the first direction (Z) can be formed, which is beneficial for guiding the emissions to the pressure relief section 5 for release along the first direction (Z), further reducing the risk that the battery cell 1 cannot smoothly release pressure. By providing the protrusion 8 extending along the first direction (Z), the structure is easier to process, and the assembly flexibility is also improved during assembly.

[0157] In embodiments of this application, the number of protrusions 8 along the circumferential direction (W) of the electrode assembly does not exceed 6.

[0158] For example, the number of protrusions 8 in the circumferential (W) direction of the electrode assembly can be 1, 2, 3, 4, 5 or 6.

[0159] In a specific embodiment, the protrusion 8 is a protrusion extending along the first direction (Z), and the number of protrusions 8 in the circumferential direction (W) of the electrode assembly can be 1, 2, 3, 4, 5 or 6.

[0160] In the embodiments of this application, the protrusion 8 extends continuously in a spiral shape around a first direction (Z).

[0161] For example, such as Figure 9 As shown, the protrusion 8 extends continuously in a spiral shape around the first direction (Z).

[0162] For example, such as Figure 9 As shown, the multiple spiral protrusions 8 can have equal spiral spacing.

[0163] As another example, although not illustrated, the spacing between the plurality of spiral protrusions 8 may be unequal.

[0164] Since the protrusion 8 extends continuously in a spiral shape around the first direction (Z), a pressure relief channel 10 that extends continuously in a spiral shape along the first direction (Z) can be formed, which is beneficial to guide the emission material to the pressure relief section 5 for release along the first direction (Z), and further reduces the risk that the battery cell 1 cannot smoothly release pressure.

[0165] In the embodiments of this application, the spacing between adjacent protrusions 8 is the same along the circumferential direction (W) of the electrode assembly 3.

[0166] For example, such as Figure 6 , Figure 8 , Figure 11 As shown, in the cylindrical battery, the protrusion 8 extends along the first direction (Z) and along the circumferential direction (W) of the electrode assembly 3, and the spacing between adjacent protrusions 8 is the same.

[0167] Since the spacing between adjacent protrusions 8 is the same, the pressure relief channel 10 can be evenly distributed around the electrode assembly 3, reducing the risk that the pressure relief channel 10 may be affected by uneven or displaced protrusions 8.

[0168] In embodiments of this application, a plurality of protrusions 8 are arranged at intervals along a first direction (Z).

[0169] It is understandable that the protrusion 8 can be provided on the first surface 6 of the housing wall 2B or the second surface 7 of the electrode assembly 3.

[0170] For example, a protrusion 8 is disposed on the second surface 7, and a plurality of protrusions 8 are arranged at intervals along a first direction (Z).

[0171] Optionally, the protrusion 8 can be a strip structure, a dot structure, a block structure, or a column structure. Of course, those skilled in the art should understand that the structural shape of the protrusion 8 is not limited to the examples and illustrations above, and can also be other shapes not mentioned.

[0172] Optionally, the projection of the protrusion 8 can be a circle, an ellipse, a semicircle, a triangle, a quadrilateral or other polygon, projected along the thickness direction (X) of the shell wall 2B onto a projection plane perpendicular to the thickness direction (X) of the shell wall 2B.

[0173] Since multiple protrusions 8 are arranged at intervals along the first direction (Z), pressure relief channels 10 can be formed in both the first direction (Z) and the circumferential direction (W) of the electrode assembly, allowing emissions to pass through. This facilitates guiding emissions along the first direction (Z) to the pressure relief section 5 for release, further reducing the risk that the battery cell 1 cannot smoothly release pressure.

[0174] In the embodiments of this application, such as Figure 7 As shown, the projection of the protrusion 8 is circular in shape, projected along the thickness direction (X) of the shell wall 2B onto a projection plane perpendicular to the thickness direction (X) of the shell wall 2B.

[0175] For example, such as Figure 8 As shown, the height h of the multiple protrusions 8 is the same, which makes the central axis of the housing 2 and the electrode assembly 3 the same, reducing the difficulty of processing and assembly.

[0176] Because the protrusion 8 is circular in shape when projected along the thickness direction (X) of the housing wall 2B, it can reduce the obstruction effect of the protrusion 8 on the emissions to a certain extent, thus avoiding affecting the smooth pressure release of the battery cell 1 through the gap. In the embodiments of this application, adjacent protrusions 8 are staggered with each other in the circumferential (W) direction of the electrode assembly.

[0177] For example, such as Figure 14 As shown, the protrusions 8 are arranged at intervals along the first direction (Z), and adjacent protrusions 8 are staggered in the circumferential (W) direction of the electrode assembly.

[0178] Therefore, the position of the protrusion 8 can be rationally designed to improve the space utilization of the battery cell 1, and also helps to alleviate the stress accumulation and stress concentration of the electrode assembly 3 during the cycling process of the battery cell 1, so that the generated stress can be evenly distributed, thereby reducing the problem of local deformation of the casing 2 due to stress concentration. In the embodiments of this application, the protrusion 8 is an elastic insulating component.

[0179] Alternatively, the protrusion 8 can be made of rubber.

[0180] For example, the elastic protrusion 8 can buffer the impact force on the electrode assembly 3 through elastic deformation, thereby improving the working stability. Similarly, the elastic part can also provide the electrode assembly 3 with a certain expansion deformation space to meet the deformation requirements during normal use of the battery assembly. When compressed, it can further suppress the expansion deformation of the electrode assembly 3 and reduce the risk of it blocking the pressure relief channel 10.

[0181] As another example, the insulating protrusion 8 can insulate the electrode assembly 3 from the housing 2, thereby achieving insulation between the housing 2 and the electrode assembly 3 and reducing the risk of leakage.

[0182] In addition, since the protrusion 8 is an elastic insulating part, the protrusion 8 can separate the housing wall 2B from the electrode assembly 3. At the same time, the elastic protrusion 8 can also facilitate the assembly of the electrode assembly 3 into the housing 2.

[0183] In the embodiments of this application, the projection is along the first direction (Z) onto a projection surface perpendicular to the first direction (Z), and the protrusion 8 is semi-circular in shape.

[0184] For example, such as Figure 8 As shown, the semi-circular protrusion 8 on the second surface 7 makes it easier to abut against the shell wall 2B, resulting in less pressure on the shell wall 2B, a simpler manufacturing process, and a larger contact surface with the shell wall 2B.

[0185] In other embodiments, such as Figure 12 , Figure 13As shown, the projection is made along the first direction (Z) onto a projection plane perpendicular to the first direction (Z), and the protrusion 8 can be triangular in shape.

[0186] Therefore, the shape of the protrusion 8 is conducive to forming a gap between the electrode assembly 3 and the housing wall 2B, which further enhances the support effect of the protrusion 8.

[0187] In the embodiments of this application, the protrusion 8 is disposed on the first surface 6, and the shape of the side of the protrusion 8 away from the first surface 6 along the thickness direction (X) of the housing wall 2B matches the outer peripheral surface of the electrode assembly 3.

[0188] For example, such as Figure 10 As shown, the electrode assembly 3 is cylindrical in shape. The protrusion 8 forms an arc-shaped portion that is recessed into the first surface 6 on the side away from the first surface 6 along the thickness direction (X) of the housing wall 2B. The shape of the arc-shaped portion can fit the outer peripheral surface of the electrode assembly 3. Therefore, the shape of the protrusion 8 is conducive to the assembly of the electrode assembly 3 into the housing 2, improves the support effect of the protrusion 8, and to a certain extent improves the suppression of the expansion of the electrode assembly 3.

[0189] In this embodiment, the width of the protrusion 8 in the circumferential direction (W) of the electrode assembly is not limited, and can be adaptively adjusted according to the shape and size of the battery cell 1.

[0190] Therefore, the number of protrusions 8 in the circumferential direction of the electrode assembly 3 is within a suitable range, which can take into account both the pressure relief effect of the formed gap and the internal space utilization of the battery cell.

[0191] The second aspect of this application discloses a battery device 100, which includes a plurality of battery cells 1 of the first aspect of this application.

[0192] In the embodiments of this application, such as Figure 2 As shown, the battery device 100 may include a housing 101, and a plurality of battery cells 1 may be disposed in the housing 101.

[0193] Alternatively, the material of the housing 101 can be an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate, or a composite material such as glass fiber and epoxy resin.

[0194] The enclosure can have various structures. Optionally, the enclosure can be a hollow structure with one side open, and a cover can be placed on the open side to form an enclosure with storage space. Alternatively, the enclosure can also be constructed as a closed enclosure.

[0195] In a specific embodiment, the housing 101 includes a cover 102 and a base plate 103 that can be fastened together. The cover 102 and the base plate 103 are fastened together, so that a closed space is formed inside the housing 101 to accommodate the battery cell 1.

[0196] Since the battery device 100 includes the battery cell 1 of the first aspect of the present application, it is beneficial for the battery device 100 to depressurize when thermal runaway occurs, thereby improving the depressurization performance and operational reliability of the battery device 100.

[0197] A third aspect of this application discloses an energy storage device 2000, such as... Figure 15 As shown, the energy storage device 2000 includes a plurality of battery cells 1 of the first aspect of the present application embodiments or a plurality of battery devices 100 of the second aspect of the present application embodiments, wherein the battery cells 1 or the battery devices 100 are used to store or provide electrical energy.

[0198] Since the energy storage device 2000 includes the battery cell 1 of the first aspect of the present application embodiment or the battery device 100 of the second aspect of the present application embodiment, it is beneficial for the energy storage device 2000 to depressurize when battery thermal runaway occurs, thereby improving the depressurization performance and operational reliability of the energy storage device 2000.

[0199] The fourth aspect of this application discloses an electrical device, including a battery cell 1 of the first aspect of this application, a battery device 100 of the second aspect of this application, or an energy storage device 2000 of the third aspect of this application, wherein the battery cell 1 or the battery device 100 is used to store or provide electrical energy.

[0200] For example, such as Figure 1 As shown, the electrical device can be a vehicle 1000, and a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be used to power the vehicle 1000.

[0201] Vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Vehicle 1000 has a battery device 100 installed inside. The battery device 100 can provide power to vehicle 1000.

[0202] Since the electrical device includes the battery cell 1 of the first aspect of the present application, the battery device 100 of the second aspect of the present application, or the energy storage device 2000 of the third aspect of the present application, it is beneficial for the electrical device to release pressure when battery thermal runaway occurs, thereby improving the pressure release performance and operational reliability of the electrical device.

[0203] The specific embodiments of this application will now be described with reference to the accompanying drawings.

[0204] Cylindrical batteries are characterized by high internal core group margin. However, this design addresses the issue of thermal runaway and casing rupture that can easily occur with cylindrical batteries. Figure 3As shown, an embodiment of this application discloses a battery cell 1. By designing a gap structure between the housing 2 and the insulating film 9 of the electrode assembly 3, a pressure relief channel 10 is provided for the gas generated during battery thermal runaway, so that the flue gas can smoothly reach the pressure relief part 5 at the end cap 4 of the battery cell 1, so as to achieve normal and timely pressure relief and avoid explosion.

[0205] The gap is formed by the support of the protrusion 8, which can be strip-shaped, dot-shaped, etc. The protrusion 8 is made of an elastic insulating material and can be processed on the first surface of the housing wall 2B or the second surface of the insulating film 9. The spacing of the formed gap ranges from 0.1 mm to 2 mm. If the spacing is too small, it will affect the venting effect; if the spacing is too large, it will affect the energy density of the battery cell 1.

[0206] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0207] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0208] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, The device includes an electrode assembly and a housing that houses the electrode assembly. The housing has an opening along a first direction, and an end cap closes the opening. The end cap is provided with a pressure relief section, which is configured to release the internal pressure of the battery cell. The housing also has a housing wall, the housing wall having a first surface on the side facing the electrode assembly, and the electrode assembly having a second surface on the side facing the housing wall. The first surface and / or the second surface are provided with protrusions that rise along the thickness direction of the housing wall, the protrusions abutting against the first surface and / or the second surface, and the protrusions are spaced apart circumferentially along the electrode assembly.

2. The battery cell according to claim 1, characterized in that, The protrusion extends continuously along the first direction.

3. The battery cell according to claim 2, characterized in that, The number of protrusions along the circumferential direction of the electrode assembly does not exceed six.

4. The battery cell according to claim 2, characterized in that, Along the circumferential direction of the electrode assembly, the spacing between adjacent protrusions is the same.

5. The battery cell according to claim 2, characterized in that, The protrusion extends continuously in a spiral shape around the first direction.

6. The battery cell according to claim 1, characterized in that, The plurality of protrusions are arranged at intervals along a first direction.

7. The battery cell according to claim 6, characterized in that, In the circumferential direction of the electrode assembly, adjacent protrusions are staggered from each other.

8. The battery cell according to claim 6, characterized in that, The projection of the protrusion is circular in shape, projected onto a projection plane perpendicular to the thickness direction of the shell wall.

9. The battery cell according to any one of claims 1 to 8, characterized in that, The protrusion is an elastic insulating component.

10. The battery cell according to any one of claims 1 to 9, characterized in that, The battery cell is a cylindrical battery.

11. The battery cell according to claim 10, characterized in that, The outer periphery of the electrode assembly is covered with an insulating film, the insulating film having a second surface, and the protrusion is disposed on the second surface and abuts against the first surface.

12. The battery cell according to claim 10, characterized in that, The projection of the convex portion onto a projection plane perpendicular to the first direction is in the first direction, and the projection of the convex portion is a semi-circular shape.

13. The battery cell according to claim 10, characterized in that, The protrusion is disposed on the first surface, and the shape of the protrusion on the side away from the first surface along the thickness direction of the housing wall matches the outer peripheral surface of the electrode assembly.

14. The battery cell according to any one of claims 1 to 11, characterized in that, Along the first direction, the ratio of the sum of the lengths of the protrusions to the length of the electrode assembly is not less than 0.3 and does not exceed 1.

15. The battery cell according to any one of claims 1 to 11, characterized in that, Along the thickness direction of the housing wall, the height of the protrusion is between 0.1 and 2 mm.

16. A battery device, characterized in that, It includes a battery cell according to any one of claims 1 to 15.

17. An energy storage device, characterized in that, It includes a battery cell as described in any one of claims 1 to 15 or a battery device as described in any one of claims 16, wherein the battery cell or the battery device is used to store or provide electrical energy.

18. An electrical appliance, characterized in that, It includes a battery cell according to any one of claims 1 to 15, a battery device according to claim 16, or an energy storage device according to claim 17, wherein the battery cell or the battery device is used to store or provide electrical energy.

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