Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment, relates to the technical field of batteries, and is used for enabling a pressure relief part in the battery monomer to have sufficient mounting space. The single battery comprises an electrode assembly, a shell and a pressure relief piece, a containing cavity is formed in the shell, and the electrode assembly is located in the containing cavity; the shell comprises a first wall, the first wall forms a cavity wall of the containing cavity, the first wall comprises a pressure relief part and a body part which are connected, the pressure relief part protrudes towards the containing cavity relative to the body part in the first direction, and the pressure relief part is provided with a through pressure relief hole. The pressure relief piece is arranged in the pressure relief hole so as to block the pressure relief hole. Wherein the first direction is the thickness direction of the first wall. The single battery is used for storing electric energy.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical appliance. 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 related technologies, pressure relief components can be installed on the bottom wall of the battery cell to achieve bottom spraying of the battery cell. However, the installation space provided by the bottom wall for pressure relief components is limited in the thickness direction of the bottom wall, which makes it difficult to meet the installation requirements of various pressure relief components. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a battery cell, a battery device, and an electrical appliance, which provides sufficient installation space for the pressure relief component in the battery cell.

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

[0006] This application provides a battery cell, which includes an electrode assembly, a housing, and a pressure relief component. The housing has an internal cavity, and the electrode assembly is located within the cavity. The housing includes a first wall, which forms a cavity wall of the cavity. The first wall includes a pressure relief portion and a main body portion connected together. Along a first direction, the pressure relief portion protrudes into the cavity relative to the main body portion, and the pressure relief portion has a through pressure relief hole. The pressure relief component is disposed within the pressure relief hole to seal it. The first direction is the thickness direction of the first wall.

[0007] In the technical solution of this application embodiment, the outer shell provides a housing space and physical protection for the electrode assembly, and the electrode assembly realizes the storage and release of electrical energy.

[0008] In the first direction, since the pressure relief part protrudes into the receiving cavity relative to the main body, the distance between the inner surface of the pressure relief part and the outer surface of the main body will increase. Thus, when the pressure relief hole is opened on the pressure relief part, the distance between the end of the pressure relief hole near the receiving cavity and the outer surface of the main body will increase. In this way, when the pressure relief component is placed in the pressure relief hole, the space between the end of the pressure relief hole near the receiving cavity and the outer surface of the main body can be used as the receiving space for the pressure relief component, so as to provide sufficient space for the pressure relief component, avoid the pressure relief component being accidentally touched, and improve the reliability of the battery cell.

[0009] In some embodiments of this application, an isolation gap exists between the electrode assembly and the body portion along a first direction.

[0010] In this way, the electrode assembly can be prevented from contacting the body, thereby preventing the body from contacting the corners of other wall panels of the connected casing, thus reducing the probability of lithium plating on the electrode assembly.

[0011] In some embodiments of this application, the inner surface of the pressure relief part has at least one airflow groove, which extends through the pressure relief part along the second direction to connect the pressure relief hole and the isolation gap; wherein the first direction intersects the second direction.

[0012] With this design, the gas inside the casing can not only directly enter the pressure relief hole, but also enter the isolation gap, and then enter the pressure relief hole through the airflow channel. This increases the exhaust space in the containment cavity, which facilitates pressure relief and provides more adequate protection for the casing.

[0013] In some embodiments of this application, a pressure relief portion is formed in the middle of the first wall, and airflow grooves are provided on both sides opposite to the pressure relief hole.

[0014] With this design, airflow grooves are present on both sides of the pressure relief hole, which can improve the balance of exhaust from both sides of the pressure relief hole.

[0015] In some embodiments of this application, the size of the airflow groove along the first direction ranges from 0.5mm to 1.8mm.

[0016] This design not only meets the gas flow requirements within the airflow channel and the exhaust requirements, but also ensures the structural strength of the pressure relief section at the airflow channel, thereby guaranteeing the structural reliability of the first wall.

[0017] In some embodiments of this application, along the first direction, the distance between the outer surface of the pressure relief portion and the electrode assembly is smaller than the distance between the outer surface of the body portion and the electrode assembly.

[0018] With this configuration, in the first direction, the inner surface of the pressure relief part protrudes into the receiving cavity relative to the inner surface of the main body, and the outer surface of the pressure relief part is concave relative to the outer surface of the main body, so that the pressure relief part sinks into the receiving cavity relative to the main body. In this way, without changing the thickness of the pressure relief part and the main body, the pressure relief part can provide sufficient installation space for the pressure relief component.

[0019] In some embodiments of this application, a pressure relief portion is formed in the middle of the first wall.

[0020] With this configuration, the pressure relief hole and pressure relief component are both located in the middle of the first wall. When venting and venting pressure, the gas around the pressure relief hole will converge towards the position close to the pressure relief hole. This can improve the synchronicity of gas flow in the containment cavity and facilitate normal venting.

[0021] In some embodiments of this application, the pressure relief component includes a connecting portion and a guide portion connected together. The connecting portion is disposed along the inner periphery of the pressure relief hole, surrounds the body portion, and is connected to the pressure relief portion. The guide portion is a flat plate structure, or the middle part of the guide portion protrudes towards the outside of the receiving cavity.

[0022] With this configuration, the connecting part serves to connect the guiding part and the pressure relief part, with the guiding part responsible for bursting during pressure relief. When the guiding part is a flat plate structure, it does not occupy excessive space along the first direction, facilitating the installation of the pressure relief component. Furthermore, the protrusion in the middle of the guiding part towards the outside of the receiving cavity guides the bursting action, allowing it to burst outwards from the receiving cavity, thus ensuring the pressure relief effect.

[0023] In some embodiments of this application, the guide portion protrudes outward toward the receiving cavity from the center. The guide portion includes a connected protruding section and a supporting section, the supporting section being disposed along the inner periphery of the connecting portion and surrounding the protruding section; along a first direction, the supporting section protrudes toward the receiving cavity relative to the connecting portion, and the protruding section protrudes outward of the receiving cavity as a whole.

[0024] With this configuration, in the first direction, since the supporting section protrudes into the receiving cavity relative to the connecting part, the distance between the inner surface of the supporting section and the outer surface of the connecting part will increase. This increases the distance between the inner surface of the supporting section and the outer surface of the connecting part. Therefore, when setting the protruding section, even if part of the protruding section overlaps with the connecting part in the first direction, sufficient space can be provided for the protruding section, thereby preventing the protruding section from being accidentally touched.

[0025] In some embodiments of this application, along the first direction, the distance between the outer surface of the support segment and the electrode assembly is smaller than the distance between the outer surface of the connection portion and the electrode assembly.

[0026] With this configuration, in the first direction, the supporting section is recessed relative to the connecting part towards the receiving cavity. This allows the supporting section to protrude relative to the connecting part towards the receiving cavity without changing the thickness of the supporting section, which facilitates actual processing and configuration.

[0027] In some embodiments of this application, the distance between the inner surface of the supporting section and the inner surface of the connecting portion along the first direction ranges from 0.5mm to 1.5mm.

[0028] This design allows the support section to sink into the receiving cavity at an appropriate distance, thereby controlling the distance between the inner surface of the support section and the outer surface of the connecting part. It also controls the space between the inner surface of the support section and the outer surface of the connecting part, so as to provide sufficient installation space for the protruding section while avoiding an excessive distance between the inner surface of the support section and the outer surface of the connecting part, thus avoiding occupying too much space.

[0029] In some embodiments of this application, the pressure relief component further includes an arc-shaped transition section, which is arranged around the connecting portion and the supporting portion, and is connected to both the connecting portion and the supporting portion. The arc-shaped transition section extends from the connecting portion toward the supporting portion and toward the receiving cavity.

[0030] With this design, the arc-shaped transition section can better transition the support section to the side of the connecting part facing the receiving cavity, thereby avoiding a large angle change at the connection between the support section and the connecting part, ensuring the ease of processing and stability of the overall structure of the pressure relief component.

[0031] In some embodiments of this application, an annular recess is formed in the pressure relief hole along the inner circumference of the pressure relief hole. The annular recess includes an annular bearing surface facing away from the receiving cavity. The pressure relief component is supported on the annular bearing surface and is matched and connected with the annular recess.

[0032] With this configuration, the annular recess can provide a supporting connection for one circumference of the pressure relief component, thereby ensuring the stability of the pressure relief component connection.

[0033] In some embodiments of this application, the battery cell further includes electrode terminals; the housing includes a shell and an end cap, a first wall is located in the shell, the shell also has an opening communicating with the receiving cavity, the opening is opposite to the first wall, the end cap is sealed in the opening and connected to the shell, and the electrode terminals are connected to the end cap.

[0034] With this configuration, the end cap is positioned opposite to the first wall, and the battery cell is a bottom-spray type. Since the electrode terminals are located on the end cap, while the pressure relief holes and pressure relief components are located on the pressure relief section of the first wall, thermal and electrical separation between the pressure relief components and the electrode terminals can be achieved, thereby improving the reliability of the battery cell.

[0035] In some embodiments of this application, the battery cell further includes a bottom support plate, which is disposed in the receiving cavity and located between the electrode assembly and the first wall. The electrode assembly is supported on the pressure relief part by the bottom support plate. The bottom support plate has an airflow channel, one end of which is connected to the receiving cavity and the other end of which leads to the pressure relief hole.

[0036] With this configuration, the electrode assembly is supported on the pressure relief section by the base plate, ensuring the stability of the setup. Since the base plate has an airflow channel, the base plate configuration can further increase the exhaust space, so that when pressure is released, the gas can be gathered at the pressure relief hole through the airflow channel, thereby facilitating pressure release.

[0037] A second aspect of this application provides a battery device, which includes a housing and a battery cell. The housing has a cavity and the battery cell as described in any of the above embodiments, and the battery cell is disposed in the cavity.

[0038] In the technical solutions of this application embodiment, since the battery device includes the battery cell in any of the above embodiments, the same beneficial effects can be achieved.

[0039] A third aspect of this application provides an electrical device, which includes a battery cell or a battery device as described in any of the above embodiments for providing electrical energy.

[0040] In the technical solutions of the embodiments of this application, since the electrical equipment includes a battery cell or battery device in any of the above embodiments for providing electrical energy, the same beneficial effects can be achieved. Attached Figure Description

[0041] 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:

[0042] Figure 1 Structural schematic diagrams of vehicles provided for some embodiments of this application;

[0043] Figure 2 Exploded schematic diagrams of battery devices provided for some embodiments of this application;

[0044] Figure 3 An exploded view of a single battery cell provided for some embodiments of this application;

[0045] Figure 4 Another exploded view of a battery cell provided for some embodiments of this application;

[0046] Figure 5 A bottom view of a single battery cell provided for some embodiments of this application;

[0047] Figure 6 A schematic diagram of the external structure of a battery cell with a pressure relief component located on the first wall, provided for some embodiments of this application;

[0048] Figure 7 for Figure 6 Cross-sectional view along the AA direction;

[0049] Figure 8 for Figure 6 Cross-sectional view along the middle BB direction;

[0050] Figure 9 for Figure 7 A schematic diagram of the cross-section within the CC range;

[0051] Figure 10 for Figure 9 A magnified view of a portion of point A in the middle;

[0052] Figure 11 for Figure 8 A schematic diagram of the cross-section within the DD range;

[0053] Figure 12 for Figure 11 A magnified view of a portion of point B in the middle;

[0054] Figure 13 A schematic diagram of the external structure of the housing provided for some embodiments of this application;

[0055] Figure 14 for Figure 13 A schematic diagram of the cross-section within the EE range;

[0056] Figure 15 for Figure 14 A magnified view of a portion of point C in the middle;

[0057] Figure 16 This is a partially enlarged schematic diagram of a battery cell including a base plate, provided for some embodiments of this application.

[0058] Explanation of reference numerals in the attached figures

[0059] 1000 - Vehicle; 100 - Battery assembly; 110 - Housing; a - Cavity; 111 - First housing section; 112 - Second housing section; 120 - Battery cell; 121 - Housing; b - Receiving cavity; d - Opening; 1211 - First wall; 12111 - Pressure relief section; h - Airflow channel; f - Pressure relief hole; g - Isolation gap; 12112 - Body section; 12113 - Bending section; 1212 - Housing; 1213 - End cap; 1214 - Peripheral wall; 123 - Electrode assembly; 124 - Base plate; 1241 - First part; 1242 - Second part; 125 - Electrode terminal; 126 - Adapter component; 127 - Pressure relief component; 1271 - Connecting part; 1272 - Guide part; 12721 - Protruding section; 12722 - Supporting section; 1273 - Arc-shaped transfer section; 128 - Annular recessed platform; 1281 - Annular bearing surface; 1282 - Annular peripheral wall surface; 130 - Battery cell assembly; 200 - Controller; 300 - Motor; X - First direction; Y - Second direction. Detailed Implementation

[0060] 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.

[0061] 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.

[0062] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] The following is a detailed description of this application.

[0069] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are being used more and more in the field of energy storage.

[0070] In existing battery systems, a single battery cell includes a casing and a pressure relief component. The casing contains a cavity and a first wall with a pressure relief hole communicating with the cavity. The pressure relief component is positioned within the pressure relief hole to seal it. Thus, when the battery cell is operating normally, the casing and pressure relief component form a sealed cavity. However, when the battery cell is depressurized, the gas generated inside the cavity converges at the pressure relief hole. Once the gas pressure inside the cavity reaches a threshold, it ruptures the pressure relief component, thus releasing the pressure. If the pressure relief component is accidentally triggered and ruptures without depressurization, it will damage the battery cell, affecting its normal operation. Therefore, preventing accidental triggering of the pressure relief component is an important research direction.

[0071] However, in related technologies, the first wall is often a flat, plate-like structure. The installation space provided by the first wall for the pressure relief component is limited along its thickness. Even with a flat pressure relief component, the installation space is still limited; for an arched pressure relief component, the thickness of the first wall is even more insufficient to accommodate its installation. This inevitably leads to accidental contact with the pressure relief component, potentially damaging individual battery cells and affecting their normal operation.

[0072] To address this issue, the battery cell in this application includes an electrode assembly, a housing, and a pressure relief component. The housing has an internal cavity, within which the electrode assembly is located. The housing includes a first wall, which forms a cavity wall within the housing. The first wall includes a connected pressure relief portion and a main body portion. Along a first direction, the pressure relief portion protrudes into the housing relative to the main body portion, and the pressure relief portion has a through-hole. The pressure relief component is disposed within the pressure relief hole to seal it. The first direction refers to the thickness direction of the first wall.

[0073] With this configuration, in the first direction, since the pressure relief part protrudes into the receiving cavity relative to the main body, the distance between the inner surface of the pressure relief part and the outer surface of the main body will increase. Thus, when the pressure relief hole is opened on the pressure relief part, the distance between the end of the pressure relief hole near the receiving cavity and the outer surface of the main body is increased. Therefore, when the pressure relief component is placed in the pressure relief hole, the space between the end of the pressure relief hole near the receiving cavity and the outer surface of the main body can be used as the receiving space for the pressure relief component, providing sufficient space for the pressure relief component, preventing the pressure relief component from being accidentally touched, and improving the reliability of the battery cell.

[0074] This application also provides a battery device including the aforementioned battery cells. Specifically, the battery device includes a housing and battery cells, with a cavity inside the housing where the battery cells are disposed. The housing thus provides both storage space and physical protection for the battery cells.

[0075] This application also provides an electrical device including the aforementioned battery device or battery cell. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0076] In the following embodiments, for ease of explanation, an example of an electrical device of this application, namely a vehicle 1000, will be used for illustration.

[0077] Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. Figure 1As 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.

[0078] 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.

[0079] Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 130 for providing voltage and capacity. The battery cell assembly 130 may include multiple battery cells 120, which are connected in series, parallel, or mixed connection via busbars.

[0080] In some embodiments, the battery cell assembly 130 is typically formed by arranging multiple battery cells 120; as an example, the battery cell assembly 130 can be a battery module, which is formed by arranging and fixing multiple battery cells 120 into a single module. As an example, the battery module can be formed by binding multiple battery cells 120 together with cable ties.

[0081] In some embodiments, such as Figure 2 As shown, the battery device 100 can be a battery pack, which includes a housing 110 and one or more battery cell assemblies 130, the battery cell assemblies 130 being housed within a cavity a.

[0082] As an example, the battery cell assembly 130 can be a battery module, which can be accommodated in the cavity a by fixing the battery module in the cavity a.

[0083] As an example, the battery cell assembly 130 can also be housed in the cavity a by directly fixing multiple battery cells 120 inside the cavity a.

[0084] As an example, such as Figure 2As shown, the housing 110 may include a first housing portion 111 and a second housing portion 112. The first housing portion 111 and the second housing portion 112 are fastened together to form a closed space, or cavity a, inside the housing 110 to house the battery cell assembly 130. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first housing portion 111 may be a top cover or a bottom plate.

[0085] In this embodiment of the application, the battery cell 120 can be a secondary battery, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.

[0086] The battery cell 120 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.

[0087] Battery cell 120 generally includes electrode assembly 123 (see Figure 4 The electrode assembly 123 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 120, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is disposed between the positive and negative electrodes to prevent short circuits between them while allowing active ions to pass through.

[0088] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0089] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0090] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, silver-treated aluminum or stainless steel, copper, aluminum, nickel, titanium, etc., can be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0091] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, the embodiments of this application are not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites.

[0092] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0093] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0094] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be aluminum with a silver surface treatment, or stainless steel, copper, aluminum, nickel, titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0095] In some embodiments, the electrode assembly 123 further includes an isolator disposed between the positive and negative electrodes.

[0096] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0097] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0098] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0099] In some embodiments, the battery cell 120 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application embodiment does not impose specific limitations on the type of electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0100] In some embodiments, the electrode assembly 123 is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0101] In some embodiments, the electrode assembly 123 has a stacked structure.

[0102] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0103] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0104] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0105] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0106] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0107] In some embodiments, the electrode assembly 123 may be cylindrical, flat, or polygonal, etc.

[0108] In some embodiments, the electrode assembly 123 is provided with tabs that can conduct current from the electrode assembly 123. The tabs include a positive tab and a negative tab.

[0109] In some embodiments, the battery cell 120 may include a housing 121. The housing 121 is used to encapsulate components such as the electrode assembly 123 and the electrolyte. The housing 121 may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 1212), or an aluminum-plastic film, etc.

[0110] As an example, the battery cell 120 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 battery cells. For example, a hexagonal prismatic battery cell can be a multi-prismatic battery cell. There are no particular limitations in the embodiments of this application, but for ease of understanding, this application uses a prismatic battery cell as an example for illustration.

[0111] Below, refer to Figures 1 to 16 Some embodiments of this application will be described in detail.

[0112] In the description of the embodiments of this application, for ease of explanation, the direction of arrow X represents "first direction X", and the direction of arrow Y represents "second direction Y". The first direction X and the second direction Y intersect. For example, the first direction X is the thickness direction of the first wall 1211, and the second direction Y is the length direction of the first wall 1211. For instance, when the battery cell 120 is a prismatic battery cell, the second direction Y is the width direction of the battery cell 120, and the first direction X and the second direction Y are perpendicular.

[0113] In some embodiments of this application, such as Figures 3-12 As shown, this application provides a battery cell 120, which includes an electrode assembly 123, a housing 121, and a pressure relief component 127. The housing 121 has a receiving cavity b inside, and the electrode assembly 123 is located in the receiving cavity b. The housing 121 includes a first wall 1211, which forms a cavity wall of the receiving cavity b. The first wall 1211 includes a pressure relief portion 12111 and a body portion 12112 connected together. Along a first direction X, the pressure relief portion 12111 protrudes into the receiving cavity b relative to the body portion 12112, and the pressure relief portion 12111 has a through pressure relief hole f. The pressure relief component 127 is disposed in the pressure relief hole f to seal the pressure relief hole f. Wherein, the first direction X is the thickness direction of the first wall 1211.

[0114] Wherein, the first direction X can be the height direction of the battery cell 120, or any other suitable direction. For ease of understanding, this application uses the first direction X as the height direction of the battery cell 120 as an example for description and illustration.

[0115] It is understandable that the pressure relief hole f penetrates the pressure relief portion 12111 in the first direction X. The pressure relief member 127 may be partially or completely disposed within the pressure relief hole f. Furthermore, since the pressure relief hole f penetrates the pressure relief portion 12111 along the first direction X, at least a portion of the pressure relief portion 12111 and the main body portion 12112 do not overlap in the first direction X. Therefore, there is no situation where the projection of the pressure relief portion 12111 in the first direction X completely coincides with the main body portion 12112.

[0116] In addition, the first wall 1211 constituting a cavity wall of the receiving cavity b means that the first wall 1211 participates in the formation of the receiving cavity b, and a portion of the inner wall surface of the receiving cavity b is located in the first wall 1211.

[0117] In some examples, the pressure relief component 127 can be connected to the pressure relief part 12111 by a suitable method such as welding, snap-fitting, or bonding. Alternatively, the pressure relief component 127 can also be an integral structure with the pressure relief part 12111, which not only ensures the structural strength between the two, but also avoids secondary processing, thereby reducing the number of processing steps.

[0118] With the above configuration, the electrode assembly 123 is disposed within the housing 121. The housing 121 provides housing space and physical protection for the electrode assembly 123. The electrode assembly 123 is used for energy storage and release. The cooperation between the housing 121 and the electrode assembly 123 ensures the normal functioning of the battery cell 120. Since the pressure relief component 127 is sealed within the pressure relief hole f, during pressure relief, the gas in the housing b can converge towards the pressure relief hole f. When the gas pressure inside the housing 121 reaches a threshold, it breaks through the pressure relief component 127, thereby achieving pressure relief.

[0119] In the first direction X, since the pressure relief portion 12111 protrudes into the receiving cavity b relative to the main body portion 12112, the distance between the inner surface of the pressure relief portion 12111 and the outer surface of the main body portion 12112 will increase. Thus, when the pressure relief hole f is opened on the pressure relief portion 12111, the distance between the end of the pressure relief hole f near the receiving cavity b and the outer surface of the main body portion 12112 will increase. Therefore, when the pressure relief member 127 is placed in the pressure relief hole f, the space between the end of the pressure relief hole f near the receiving cavity b and the outer surface of the main body portion 12112 can all serve as the installation and receiving space for the pressure relief member 127. This provides sufficient space for the pressure relief member 127, prevents the pressure relief member 127 from being accidentally touched, and improves the reliability of the battery cell 120.

[0120] Along the first direction X, the pressure relief portion 12111 can be increased in thickness so that it protrudes into the receiving cavity b relative to the main body portion 12112; alternatively, the pressure relief portion 12111 can be sunk into the receiving cavity b relative to the main body portion 12112, thereby causing the pressure relief portion 12111 to protrude into the receiving cavity b relative to the main body portion 12112. A detailed description follows.

[0121] In some embodiments of this application, such as Figures 10-12 As shown, along the first direction X, the distance between the outer surface of the pressure relief part 12111 and the electrode assembly 123 is smaller than the distance between the outer surface of the body part 12112 and the electrode assembly 123.

[0122] For ease of understanding, L1 represents the distance between the outer surface of the pressure relief part 12111 and the electrode assembly 123, and L2 represents the distance between the outer surface of the body part 12112 and the electrode assembly 123.

[0123] In addition, it is understandable that since the pressure relief portion 12111 protrudes into the receiving cavity b relative to the body portion 12112 in the first direction X, the distance between the inner surface of the pressure relief portion 12111 and the electrode assembly 123 can be smaller than the distance between the inner surface of the body portion 12112 and the electrode assembly 123.

[0124] In some examples, such as Figures 10-12 As shown, the first wall 1211 also includes a curved portion 12113. In the extension direction of the first wall 1211, the curved portion 12113 is disposed between the pressure relief portion 12111 and the main body portion 12112, and is connected to both the pressure relief portion 12111 and the main body portion 12112. The curved portion 12113 extends from the main body portion 12112 towards the pressure relief portion 12111 and towards the electrode assembly 123. The curved portion 12113 allows the pressure relief portion 12111 to smoothly sink into the receiving cavity b relative to the main body portion 12112, avoiding excessively large angle changes at the connection point between the pressure relief portion 12111 and the main body portion 12112, thus facilitating the connection between the pressure relief portion 12111 and the main body portion 12112.

[0125] It is understandable, such as Figure 10 As shown, the connection boundary between the curved portion 12113 and the main body portion 12112 refers to the position where the angle between the two changes abruptly, for example, the boundary line K1. The connection boundary between the curved portion 12113 and the pressure relief portion 12111 refers to the position where the angle between the two changes abruptly, for example, the boundary line K2.

[0126] With the above configuration, in the first direction X, the pressure relief part 12111 sinks into the receiving cavity b relative to the main body part 12112. In this way, without changing the thickness of the first wall 1211 at different positions in the second direction Y, the pressure relief part 12111 can protrude into the receiving cavity b relative to the main body part 12112 in the first direction X.

[0127] Additionally, it is understood that in the first direction X, since there is a certain space between the outer surface of the pressure relief part 12111 and the plane containing the outer surface of the main body part 12112, this space can provide additional installation space for the pressure relief member 127. Therefore, this additional space can serve as the installation space for the pressure relief member 127. Because of the presence of the main body part 12112, the main body part 12112 can provide protection for the pressure relief member 127.

[0128] In other embodiments, along the first direction X, the outer surface of the pressure relief portion 12111 is flush with the outer surface of the body portion 12112, and the size of the pressure relief portion 12111 in the first direction X is larger than the size of the body portion 12112 in the first direction X. Thus, the thickness of the pressure relief portion 12111 increases along the first direction X. After the pressure relief hole f is opened on the pressure relief portion 12111, the depth of the pressure relief hole f can be increased. Thus, after the pressure relief member 127 is placed in the pressure relief hole f, the increased size of the pressure relief hole f can also provide sufficient installation space for the pressure relief member 127.

[0129] The positional relationship between the pressure relief portion 12111 and the main body portion 12112 can be varied. For example, the pressure relief portion 12111 may be formed in the middle of the first wall 1211. Alternatively, the pressure relief portion 12111 and the main body portion 12112 may be arranged sequentially along the second direction Y. A detailed description follows.

[0130] In some embodiments of this application, such as Figure 5 As shown, the pressure relief section 12111 is formed in the middle of the first wall 1211.

[0131] In some examples, such as Figure 5 As shown, along the second direction Y, the first direction X intersects with the second direction Y. Both ends of the pressure relief part 12111 are connected to the body part 12112, thereby using the two body parts 12112 to sandwich the pressure relief part 12111 in the middle. This design can better fit the structure of the cubic battery cell 120. In addition, along the first direction X, if the distance between the outer surface of the pressure relief part 12111 and the electrode assembly 123 is less than the distance between the outer surface of the body part 12112 and the electrode assembly 123, if the pressure relief member 127 extends between the two body parts 12112, then both body parts 12112 can protect the extended part of the pressure relief member 127.

[0132] In other examples, the body portion 12112 is arranged around the pressure relief portion 12111, that is, the body portion 12112 is a ring-shaped structure. In this design, if the distance between the outer surface of the pressure relief portion 12111 and the electrode assembly 123 along the first direction X is less than the distance between the outer surface of the body portion 12112 and the electrode assembly 123, and if the pressure relief member 127 extends to the pressure relief hole f, then the body portion 12112 can protect the extended portion of the pressure relief member 127 all around.

[0133] With the above configuration, both the pressure relief hole f and the pressure relief component 127 are located in the middle of the first wall 1211. During exhaust pressure relief, the gas around the pressure relief hole f will converge towards the position close to the pressure relief hole f, which can improve the synchronicity of gas flow in the accommodating cavity b and facilitate normal exhaust. In addition, when the distance between the outer surface of the pressure relief part 12111 and the electrode assembly 123 is less than the distance between the outer surface of the body part 12112 and the electrode assembly 123, if the pressure relief component 127 extends into the pressure relief hole f, the body part 12112 can better protect the extended portion of the pressure relief component 127.

[0134] In some embodiments of this application, such as Figure 7 , Figure 10 As shown, along the first direction X, there is an isolation gap g between the electrode assembly 123 and the body portion 12112.

[0135] In some examples, the housing 121 includes not only the first wall 1211 but also a peripheral wall 1214, which surrounds the first wall 1211 circumferentially. Thus, the junction between the peripheral wall 1214 and the first wall 1211 will have a corner. For example, a corner could refer to... Figure 7 The area within the circle indicated by Q in the diagram is such that the electrode assembly 123 does not contact the body portion 12112, and therefore the electrode assembly 123 does not contact the corner. This avoids the electrode assembly 123 from contacting and being squeezed by the corner, thereby preventing lithium deposition on the electrode assembly 123 and ensuring the normal operation of the electrode assembly 123.

[0136] With the above configuration, the electrode assembly 123 does not contact the body 12112. This avoids contact and compression between the electrode assembly 123 and the corner of the connection between the body 12112 and the wall panel on the outer casing 121 (excluding the first wall 1211), thereby reducing the probability of lithium plating on the electrode assembly 123 and ensuring the normal operation of the electrode assembly 123.

[0137] In some embodiments of this application, such as Figures 9-12As shown, the inner surface of the pressure relief part 12111 has at least one airflow groove h. Along the second direction Y, the airflow groove h penetrates the pressure relief part 12111 to connect the pressure relief hole f and the isolation gap g; wherein the first direction X intersects the second direction Y.

[0138] The airflow groove h can be a curved groove or a straight groove, as long as it can connect the pressure relief hole f and the isolation gap g.

[0139] With the above settings, when the gas pressure inside the battery cell 120 increases, that is, when gas begins to be generated inside the battery cell 120, the gas can not only directly enter the pressure relief hole f, but also enter the isolation gap g. Since the airflow channel h connects the isolation gap g and the pressure relief hole f, the gas entering the isolation gap g can enter the pressure relief hole f through the airflow channel h. This can increase the exhaust space in the accommodating cavity b, so as to achieve pressure relief and provide more adequate protection for the outer casing 121.

[0140] In some embodiments of this application, such as Figures 9-15 As shown, the pressure relief section 12111 is formed in the middle of the first wall 1211, and airflow grooves h are provided on both sides opposite to the pressure relief hole f.

[0141] In some examples, along the second direction Y, both ends of the pressure relief section 12111 are connected to the body section 12112. Therefore, each end of the body section 12112 and the electrode assembly 123 has at least one airflow groove h. This ensures that the gas between the isolation gap g between the two body sections 12112 and the electrode assembly 123 can be gathered into the pressure relief hole f through the corresponding airflow groove h, thus facilitating normal pressure relief.

[0142] In some other examples, the body portion 12112 surrounds the pressure relief portion 12111, so the two sides opposite to the pressure relief hole f can be the two sides opposite to the pressure relief hole f along the second direction Y.

[0143] With the above configuration, airflow grooves h are provided on both sides of the pressure relief hole f. When pressure is relieved, the airflow on both sides of the pressure relief hole f can converge towards the pressure relief hole f, which can improve the synchronicity of gas flow in the receiving cavity b, improve the balance of exhaust on both sides of the pressure relief hole f, and improve the pressure relief effect.

[0144] In addition, since the pressure relief section 12111 serves to support the electrode assembly 123, and the pressure relief section 12111 also has an airflow groove h, this design has two functions: first, to increase the exhaust space, and second, to prevent lithium deposition when the electrode assembly 123 contacts the corner where it connects with the peripheral wall 1214 and the body section 12112. Therefore, by combining the two effects, the bottom support plate 124 of the battery cell 120 can be selectively removed, thereby saving the space of the receiving cavity b and effectively increasing the usable space of the receiving cavity b, thereby improving the energy density of the battery cell 120.

[0145] In some embodiments of this application, such as Figure 10 As shown, along the first direction X, the size of the airflow groove h ranges from 0.5mm to 1.8mm.

[0146] In some examples, the size of the airflow slot h along the first direction X is H1, and the range of H1 can be 0.6mm-1.8mm, 1.0mm-1.8mm, 1.3mm-1.8mm, or 0.5mm-1.5mm. The specific setting can be selected according to the needs.

[0147] In some examples, H1 can be equal to 0.5mm, 1.0mm, 1.4mm, 1.5mm, 1.8mm, etc.

[0148] For example, H1 = 0.5mm. Thus, along the first direction X, the airflow groove h can be controlled to be in a smaller size, which can ensure the structural strength of the pressure relief part 12111 at the airflow groove h, thereby ensuring that the pressure relief part 12111 provides sufficient strength support for the pressure relief component 127 and improves the overall reliability of the battery cell 120.

[0149] For example, H1 = 1.8mm. This ensures the structural strength of the pressure relief part 12111 at the airflow groove h, while maximizing the size of the airflow groove h in the first direction X, thereby ensuring the flow rate of the gas flowing through the airflow groove h and thus ensuring the smoothness of gas flow.

[0150] With the above settings, the size of the airflow groove h can be rationalized along the first direction X. This not only meets the gas flow requirements and exhaust requirements in the airflow groove h, but also ensures the structural strength of the pressure relief part 12111 at the airflow groove h, thereby ensuring the structural reliability of the first wall 1211 and thus ensuring the overall structural reliability of the battery cell 120.

[0151] In some embodiments of this application, such as Figure 4As shown, the battery cell 120 also includes electrode terminals 125. The housing 121 includes a housing 1212 and an end cap 1213. A first wall 1211 is located on the housing 1212. The housing 1212 also has an opening d communicating with the receiving cavity b. The opening d is opposite to the first wall 1211. The end cap 1213 is sealed at the opening d and connected to the housing 1212. The electrode terminals 125 are connected to the end cap 1213.

[0152] In other words, the first wall 1211 is opposite to the end cap 1213. When the end cap 1213 is located at the top of the battery cell 120, the first wall 1211 is the bottom wall of the battery cell 120. Thus, the battery cell 120 in this application is a bottom spray type.

[0153] In some examples, such as Figure 4 As shown, the battery cell 120 also includes an adapter 126, which is used to connect the electrode terminal 125 (terminal post) and the electrode assembly 123 to realize the electrical connection between the electrode assembly 123 and the electrode terminal 125.

[0154] For example, the adapter 126 is a sheet-like structure. The sheet-like adapter 126 can save space inside the housing 121 and ensure the energy density of the battery cell 120 while realizing the electrical connection between the electrode assembly 123 and the electrode terminal 125.

[0155] With the above configuration, since the electrode terminal 125 and the pressure relief component 127 are located on the opposite end cover 1213 and the first wall 1211 respectively, thermoelectric separation of the electrode terminal 125 and the pressure relief component 127 can be achieved, thereby improving the reliability of the battery cell 120. Furthermore, when the battery cell 120 is a bottom-spray type, after the battery cell 120 is installed on the vehicle 1000, when the battery cell 120 is depressurized, gas can be sprayed away from the passenger compartment, thus improving the safety of the vehicle 1000.

[0156] The structure of the pressure relief component 127 varies, and will be described in detail below.

[0157] In some embodiments of this application, such as Figures 10-12 As shown, the pressure relief component 127 includes a connecting portion 1271 and a guide portion 1272 connected together. The connecting portion 1271 is disposed along the inner periphery of the pressure relief hole f and surrounds the guide portion 1272, and is connected to the pressure relief portion 12111. The guide portion 1272 has a flat plate structure, or the middle part of the guide portion 1272 protrudes outward toward the receiving cavity b.

[0158] It is understandable that the connecting part 1271 is an annular structure surrounding the guide part 1272, serving to connect the guide part 1272 and the pressure relief part 12111. The guide part 1272 primarily functions to relieve pressure. The guide part 1272 has grooves that are close to the connection point between the guide part 1272 and the connecting part 1271. Thus, when pressure relief is needed, the guide part 1272 can be ruptured by the gas, thereby achieving gas exhaust and pressure relief. Furthermore, for ease of understanding, as shown below... Figure 10 , Figure 12 The dividing line M shown divides the guide portion 1272 and the connecting portion 1271.

[0159] With the above configuration, the connecting part 1271 serves to connect the guiding part 1272 and the pressure relief part 12111, with the guiding part 1272 responsible for bursting during pressure relief. When the guiding part 1272 is a flat plate structure, along the first direction X, the flat plate structure of the guiding part 1272 will not occupy too much space, which not only facilitates the setting of the pressure relief component 127, but also allows control over the size of the first wall 1211 in the first direction X, and facilitates control over the size of the battery cell 120 in the first direction X. Thus, more battery cells 120 can be placed in the same space of the battery device 100, thereby increasing the energy density of the battery device 100.

[0160] As for the protrusion of the middle part of the guide portion 1272 towards the outside of the receiving cavity b, the shape of the guide portion 1272 can guide its explosion in a direction away from the inside of the receiving cavity b. That is to say, when depressurizing, the guide portion 1272 can be made to explode outward, thereby ensuring the depressurization effect and improving the reliability of depressurization of the battery cell 120. In addition, when the battery cell 120 is under positive and negative pressure conditions, the shape of the guide portion 1272 can resist the switching changes of positive and negative pressure inside and outside the outer casing 121, reducing the risk of fatigue cracking.

[0161] In some embodiments of this application, the guide portion 1272 protrudes outward toward the receiving cavity b from its center. The guide portion 1272 includes a connected protruding section 12721 and a supporting section 12722, the supporting section 12722 being disposed along the inner periphery of the connecting portion 1271 and surrounding the protruding section 12721. Along the first direction X, the supporting section 12722 protrudes toward the receiving cavity b relative to the connecting portion 1271, and the protruding section 12721 protrudes outward of the receiving cavity b as a whole.

[0162] In other words, the protruding section 12721 is an arched structure to adapt to positive and negative pressure conditions, while also guiding the blasting.

[0163] For ease of understanding, Figures 10-12The dividing line N1 shown divides the protruding section 12721 and the supporting section 12722, and the dividing line N2 divides the supporting section 12722 and the connecting part 1271.

[0164] For example, the notch can be made on the support section 12722, which facilitates the setting of the notch and also ensures the structural strength of the protruding section 12721.

[0165] With the above configuration, in the first direction X, since the supporting section 12722 protrudes into the receiving cavity b relative to the connecting part 1271, the distance between the inner surface of the supporting section 12722 and the outer surface of the connecting part 1271 will increase. This increases the distance between the inner surface of the supporting section 12722 and the outer surface of the connecting part 1271. Therefore, when the protruding section 12721 is configured, even if a part of the protruding section 12721 overlaps with the connecting part 1271 in the first direction X, sufficient space can be provided for the protruding section 12721, thereby preventing the protruding section 12721 from being accidentally touched.

[0166] In some embodiments of this application, along the first direction X, the distance between the outer surface of the support section 12722 and the electrode assembly 123 is less than the distance between the outer surface of the connection portion 1271 and the electrode assembly 123.

[0167] With the above configuration, in the first direction X, the supporting section 12722 sinks into the receiving cavity b relative to the connecting part 1271. This allows the supporting section 12722 to protrude into the receiving cavity b relative to the connecting part 1271 without changing the thickness of the supporting section 12722, which facilitates actual processing and configuration.

[0168] In other embodiments, the thickness of the support section 12722 can be increased so that the support section 12722 protrudes relative to the connecting portion 1271 toward the receiving cavity b. The relationship between the support section 12722 and the connecting portion 1271 here is similar to the relationship between the body portion 12112 and the pressure relief portion 12111 mentioned above.

[0169] In some embodiments of this application, such as Figure 12 As shown, along the first direction X, the distance between the inner surface of the supporting section 12722 and the inner surface of the connecting part 1271 ranges from 0.5mm to 1.5mm.

[0170] In some examples, along the first direction X, the distance between the inner surface of the supporting section 12722 and the inner surface of the connecting part 1271 is H2, and the range of H2 can be 0.6mm-1.5mm, 1.0mm-1.5mm, 1.3mm-1.5mm, or 0.5mm-1.2mm. The specific setting can be selected as needed.

[0171] In some examples, H2 can be equal to 0.5mm, 0.8mm, 1.2mm, 1.3mm, 1.5mm, etc.

[0172] For example, H2 = 0.5mm, which can provide sufficient installation space for the protruding section 12721 while avoiding an excessive distance between the inner surface of the supporting section 12722 and the outer surface of the connecting part 1271, thus avoiding occupying too much space.

[0173] For example, H2 = 1.5mm, which can provide sufficient installation space for the protruding section 12721 while avoiding excessive distance between the inner surface of the supporting section 12722 and the outer surface of the connecting part 1271, thus avoiding taking up too much space, especially suitable for the protruding shape of the protruding section 12721.

[0174] With the above settings, the distance by which the supporting section 12722 sinks into the receiving cavity b is appropriate, thereby controlling the distance between the inner surface of the supporting section 12722 and the outer surface of the connecting part 1271, and controlling the space between the inner surface of the supporting section 12722 and the outer surface of the connecting part 1271, so as to provide sufficient installation space for the protruding section 12721, while avoiding the distance between the inner surface of the supporting section 12722 and the outer surface of the connecting part 1271 being too large, thus avoiding occupying too much space.

[0175] In some embodiments of this application, such as Figures 10-12 As shown, the pressure relief component 127 also includes an arc-shaped transfer section 1273, which is arranged around the connecting portion 1271 and the supporting section 12722. The arc-shaped transfer section 1273 is connected to both the connecting portion 1271 and the supporting section 12722. The arc-shaped transfer section 1273 extends from the connecting portion 1271 toward the supporting section 12722 and toward the receiving cavity b.

[0176] In other words, the arc-shaped transition segment 1273 is a ring-shaped arc structure.

[0177] For ease of understanding, such as Figures 10-12 In this configuration, the dividing line N2 can be used as the boundary between the arc-shaped transition segment 1273 and the supporting segment 12722, and the dividing line M can be used as the boundary between the connecting part 1271 and the supporting segment 12722. That is, the arc-shaped transition segment 1273 is located between the dividing line M and the dividing line N2. The dividing line M refers to the position where the angle between the connecting part 1271 and the arc-shaped transition segment 1273 changes abruptly, and the dividing line N2 refers to the position where the angle between the arc-shaped transition segment 1273 and the supporting segment 12722 changes abruptly.

[0178] Additionally, it is understandable that if the arc-shaped transition segment 1273 is not set, then the dividing line M and the dividing line N2 will coincide.

[0179] With the above configuration, the arc-shaped transition section 1273 can better transition the supporting section 12722 to the side of the connecting part 1271 facing the receiving cavity b, thereby avoiding a large angle change in the connection between the supporting section 12722 and the connecting part 1271, which facilitates the molding of the pressure relief component 127 and ensures the ease of construction and stability of the overall structure of the pressure relief component 127.

[0180] In some embodiments, such as Figure 15 or Figure 16 As shown, an annular recess 128 is formed in the pressure relief hole f along the inner periphery of the pressure relief hole f. The annular recess 128 includes an annular bearing surface 1281 facing away from the receiving cavity b. The pressure relief component 127 is supported on the annular bearing surface 1281 and is matched and connected with the annular recess 128.

[0181] In some examples, the annular recess 128 includes not only an annular bearing surface 1281 but also an annular peripheral wall surface 1282. The annular peripheral wall surface 1282 is part of the inner wall of the pressure relief hole f. The annular peripheral wall surface 1282 is set at an angle to the annular bearing surface 1281, and the annular peripheral wall surface 1282 surrounds the outer peripheral wall surface of the pressure relief component 127 and is connected to the outer peripheral wall surface of the pressure relief component 127. Through the connection between the annular peripheral wall surface 1282 and the outer peripheral wall surface of the pressure relief component 127, the pressure relief component 127 is connected to the pressure relief hole f.

[0182] In some examples, when the pressure relief component 127 includes a connecting portion 1271 and a guide portion 1272, the connecting portion 1271 is supported on the annular bearing surface 1281 and is matched and connected to the annular recess 128.

[0183] With the above configuration, the annular bearing surface 1281 can provide stable support for the pressure relief chamber around the circumference, thereby ensuring the stability of the pressure relief component 127.

[0184] In some embodiments, such as Figure 16 As shown, the battery cell 120 also includes a bottom support plate 124. The bottom support plate 124 is disposed in the receiving cavity b and is located between the electrode assembly 123 and the first wall 1211. The electrode assembly 123 is supported on the pressure relief part 12111 by the bottom support plate 124. The bottom support plate 124 has an airflow channel. One end of the airflow channel is connected to the receiving cavity b, and the other end of the airflow channel leads to the pressure relief hole f.

[0185] It is understandable that one end of the airflow channel is connected to the receiving cavity b, and the other end of the airflow channel leads to the pressure relief hole f. This means that when pressure is relieved, the gas in the receiving cavity f can be gathered at the pressure relief hole f through the airflow channel so as to break through the pressure relief component 127.

[0186] In some examples, such as Figure 16 As shown, the inner surface of the pressure relief part 12111 has an airflow groove h. Both ends of the pressure relief part 12111 are connected to the main body part 12112. In the second direction Y, the bottom support plate 124 includes a first part 1241 and a second part 1242. The second part 1242 is connected to both ends of the first part 1241. The first part 1241 abuts between the pressure relief part 12111 and the electrode assembly 123. The second part 1242 is disposed in the isolation gap g. Along the first direction X, the inner surface of the second part 1242 and the inner surface of the pressure relief part 12111 still have a portion of the isolation gap g.

[0187] Of course, in other examples, the first part 1241 and the second part 1242 can also be flat plate-like structures located in the same plane.

[0188] With the above configuration, since the base plate 124 has an airflow channel, the exhaust space can be further increased. In this way, when depressurizing, it is easier to guide the gas to the position near the depressurization hole f, so that the gas can easily break through the depressurization component 127, ensuring the normal depressurization process, thereby protecting the outer shell 121, preventing the outer shell 121 from cracking, and reducing the probability of a greater explosion risk.

[0189] In a second aspect of the embodiments of this application, a battery device 100 is also provided. The battery device 100 includes a housing 110 and a battery cell 120. The housing 110 has a cavity and the battery cell 120 in any of the above embodiments. The battery cell 120 is disposed in the cavity a.

[0190] With this configuration, since the battery device 100 includes the battery cell 120 in any of the above embodiments, it can also ensure sufficient installation space for the pressure relief component 127.

[0191] In a third aspect of the embodiments of this application, an electrical device is also provided, which includes a battery cell 120 or a battery device 100 in any of the above embodiments for providing electrical energy.

[0192] With this configuration, since the electrical equipment includes the battery cell 120 or battery device 100 in any of the above embodiments for providing electrical power, it can also ensure sufficient installation space for the pressure relief component 127.

[0193] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A battery cell, characterized in that, include: Electrode assembly; The outer casing has an internal cavity, and the electrode assembly is located within the cavity. The outer casing includes a first wall that forms a cavity wall of the cavity. The first wall includes a pressure relief portion and a body portion connected together. Along a first direction, the pressure relief portion protrudes into the cavity relative to the body portion, and the pressure relief portion has a through pressure relief hole. A pressure relief component is provided inside the pressure relief hole to seal the pressure relief hole; Wherein, the first direction is the thickness direction of the first wall.

2. The battery cell according to claim 1, characterized in that, Along the first direction, there is an isolation gap between the electrode assembly and the body portion.

3. The battery cell according to claim 2, characterized in that, The inner surface of the pressure relief part has at least one airflow groove, and the airflow groove penetrates the pressure relief part along the second direction to connect the pressure relief hole and the isolation gap; Wherein, the first direction intersects with the second direction.

4. The battery cell according to claim 3, characterized in that, The pressure relief section is formed in the middle of the first wall, and the airflow grooves are located on both sides opposite to the pressure relief hole.

5. The battery cell according to claim 3, characterized in that, Along the first direction, the size of the airflow groove ranges from 0.5mm to 1.8mm.

6. The battery cell according to any one of claims 1-5, characterized in that, Along the first direction, the distance between the outer surface of the pressure relief portion and the electrode assembly is less than the distance between the outer surface of the body portion and the electrode assembly.

7. The battery cell according to any one of claims 1-5, characterized in that, The pressure relief section is formed in the middle of the first wall.

8. The battery cell according to any one of claims 1-5, characterized in that, The pressure relief component includes a connecting portion and a guiding portion. The connecting portion is disposed along the inner periphery of the pressure relief hole, surrounds the guiding portion, and is connected to the pressure relief portion. The guiding portion is a flat plate structure, or the middle part of the guiding portion protrudes towards the outside of the receiving cavity.

9. The battery cell according to claim 8, characterized in that, When the middle portion of the guide protrudes outward toward the receiving cavity; the guide includes a connected protruding section and a supporting section, the supporting section being disposed along the inner periphery of the connecting portion and surrounding the protruding section; along the first direction, the supporting section protrudes toward the receiving cavity relative to the connecting portion, and the protruding section as a whole protrudes toward the outside of the receiving cavity.

10. The battery cell according to claim 9, characterized in that, Along the first direction, the distance between the outer surface of the support segment and the electrode assembly is less than the distance between the outer surface of the connection portion and the electrode assembly.

11. The battery cell according to claim 9, characterized in that, Along the first direction, the distance between the inner surface of the supporting section and the inner surface of the connecting part ranges from 0.5mm to 1.5mm.

12. The battery cell according to claim 9, characterized in that, The pressure relief component further includes an arc-shaped transfer section, which is arranged around the connecting part and the supporting section, and is connected to the connecting part and the supporting section respectively; The arc-shaped transfer section extends from the connecting portion toward the supporting section and toward the electrode assembly.

13. The battery cell according to any one of claims 1-5, characterized in that, An annular recess is formed within the pressure relief hole along its inner circumference. The annular recess includes an annular bearing surface facing away from the receiving cavity. The pressure relief component is supported on the annular bearing surface and is matched and connected to the annular recess.

14. The battery cell according to any one of claims 1-5, characterized in that, The battery cell further includes electrode terminals; the housing includes a shell and an end cap, the first wall is located in the shell, the shell also has an opening communicating with the receiving cavity, the opening is opposite to the first wall, the end cap is sealed in the opening and connected to the shell, and the electrode terminals are connected to the end cap.

15. The battery cell according to any one of claims 1-5, characterized in that, The battery cell also includes a bottom support plate, which is disposed in the receiving cavity and located between the electrode assembly and the first wall. The electrode assembly is supported by the pressure relief part through the bottom support plate. The bottom support plate has an airflow channel, one end of which is connected to the receiving cavity and the other end of which leads to the pressure relief hole.

16. A battery device, characterized in that, include: The box-shaped enclosure has internal cavities. The battery cell according to any one of claims 1-15, wherein the battery cell is disposed in the cavity.

17. An electrical appliance, characterized in that, Includes the battery cell of any one of claims 1-15 for providing electrical energy, or the battery device of claim 16.

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