Shell component, battery cell, battery and electric equipment

Abstract

The embodiment of the invention provides a shell component, a battery monomer, a battery and electric equipment, and belongs to the technical field of batteries. The shell component is used for the single battery and provided with a first surface, the first surface is provided with a sinking groove, the groove bottom wall of the sinking groove comprises a first area and a second area, the thickness of the first area is smaller than that of the second area, and at least one part of the first area is provided with a nick groove. The case member is configured to break at the indented groove to release pressure inside the battery cell. The shell component is relatively low in processing and manufacturing difficulty and relatively low in processing and manufacturing cost, so that the processing and manufacturing cost of the single battery and the battery is reduced.

Description

Shell parts, battery cells, batteries and electrical equipment Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a housing component, a battery cell, a battery, and an electrical device. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] In the development of battery technology, in addition to improving the energy density of batteries, processing and manufacturing costs are also an issue that cannot be ignored. Therefore, how to reduce processing and manufacturing costs is a technical problem that needs to be solved urgently in battery technology.

[0004] Summary of the Invention

[0005] The purpose of the present application is to provide a housing component, a battery cell, a battery, and an electrical device. The housing component has low processing difficulty and low processing cost, thereby reducing the processing cost of the battery cell and the battery.

[0006] This application is achieved through the following technical solutions:

[0007] In a first aspect, the present application provides a shell component for a battery cell, the shell component having a first surface, the first surface being provided with a recessed groove, the bottom wall of the recessed groove including a first zone and a second zone, the thickness of the first zone being less than the thickness of the second zone, at least a portion of the first zone being provided with a notched groove, and the shell component being configured to rupture at the notched groove to release pressure inside the battery cell.

[0008] According to the shell component of the embodiment of the present application, the bottom wall of the groove serves as the pressure relief structure of the shell component. The bottom wall of the groove is divided into zones, and the thickness of the first zone and the second zone are different. The thickness of the first zone is thinner, and the notched groove is provided in at least a part of the first zone. The thickness of the second zone is thicker, which makes the processing difficulty of the shell component lower, reduces the processing and manufacturing cost, and thus reduces the processing and manufacturing cost of the battery cell composed of the shell component.

[0009] According to some embodiments of the present application, the first region surrounds at least a portion of the second region.

[0010] In the above solution, the first area is arranged around at least a portion of the second area, which is convenient for setting the notched groove. A longer notched groove can be set, and the second area can be opened with the notched groove as the boundary, thereby forming a pressure relief channel.

[0011] According to some embodiments of the present application, the first region connects the second region and a side wall of the sink.

[0012] In the above solution, the first area is located between the side wall of the sink and the second area, which is convenient for processing and manufacturing. The first area can have a larger area, which is convenient for setting a longer notched groove and relieving pressure.

[0013] According to some embodiments of the present application, the score groove surrounds at least a portion of the second region.

[0014] In the above solution, the scored groove surrounds at least a portion of the second area, and the scored groove can have a relatively long length to facilitate the opening of the second area, so as to facilitate timely pressure relief after the scored groove ruptures.

[0015] According to some embodiments of the present application, the scored groove is a closed annular groove.

[0016] In the above solution, the scored groove is a closed annular groove, which facilitates the rupture of the scored groove and the opening of the second zone. After the scored groove is ruptured, a larger pressure relief channel is formed.

[0017] According to some embodiments of the present application, the number of second zones is two, the first zone includes a first sub-zone and a second sub-zone, the first sub-zone is a ring structure, the first sub-zone surrounds the two second zones, the second sub-zone is located between the two second zones, and the two ends of the second sub-zone are respectively connected to the first sub-zone.

[0018] In the above scheme, the first sub-region surrounds the two second regions, and the second sub-region is located between the two second regions. The position of the notch groove is flexible, which is convenient for pressure release. At the same time, when the shell component is stamped and formed, the stress is concentrated at the connection between the second sub-region and the first sub-region, which is easy to break and convenient for pressure release.

[0019] According to some embodiments of the present application, the notch groove includes a first sub-notch groove, a second sub-notch groove and a third sub-notch groove, the first sub-notch groove and the second sub-notch groove are arranged in a first sub-area, the third sub-notch groove is arranged in the second sub-area, the two second areas are located between the first sub-notch groove and the second sub-notch groove, and the two ends of the third sub-notch groove are respectively connected to the first sub-notch groove and the second sub-notch groove.

[0020] In the above solution, the first sub-score groove, the second sub-score groove and the third sub-score groove are arranged at different positions so as to increase the rupture area of ​​the shell component and facilitate pressure relief.

[0021] According to some embodiments of the present application, the first sub-score groove and the second sub-score groove are arranged in parallel.

[0022] In the above solution, the first sub-score groove and the second sub-score groove are arranged in parallel, which is convenient for processing and manufacturing.

[0023] According to some embodiments of the present application, the second area protrudes from the first area toward the opening of the sink, and the opening is arranged opposite to the bottom wall of the sink.

[0024] In the above solution, the second area protrudes from the first area in the direction toward the opening of the sink, which is convenient for processing and manufacturing, for example, convenient for stamping and forming.

[0025] According to some embodiments of the present application, the second region has a second surface facing the opening, and the second surface is a plane.

[0026] In the above solution, the second surface is a plane with a simple structure and is easy to process.

[0027] According to some embodiments of the present application, the thickness of the first zone is H1, and the thickness of the second zone is H2, satisfying: 0.3 mm ≤ H2 - H1 ≤ 1.5 mm.

[0028] In the above solution, the thickness H1 of the first zone and the thickness H2 of the second zone satisfy the aforementioned relationship. This not only ensures high strength of the groove bottom wall, but also facilitates material flow during stamping, reducing manufacturing complexity. If H2-H1 is small (e.g., less than 0.3mm), the thickness of the second zone is thinner, making processing and manufacturing more difficult. If H2-H1 is large (e.g., greater than 1.5mm), the thickness of the first zone is thinner, resulting in lower strength, which can easily lead to premature cracking of the notch groove when not in the pressure relief state, thus shortening its service life.

[0029] According to some embodiments of the present application, 0.5 mm ≤ H2 - H1 ≤ 1 mm.

[0030] In the above solution, compared with 0.3mm≤H2-H1≤1.5mm, when 0.5mm≤H2-H1≤1mm, the thickness of the second zone can be thicker, which is convenient for processing and manufacturing, and the strength of the groove bottom wall is higher.

[0031] According to some embodiments of the present application, the second region has a second surface facing the opening, and the second surface is a curved surface arched toward the opening.

[0032] In the above solution, the second surface is arched toward the opening, the second area has a higher strength, is easy to process and manufacture, and has a lower difficulty in processing and manufacturing.

[0033] According to some embodiments of the present application, the thickness of the first zone is H1, and the maximum thickness of the second zone is H3, satisfying: 0.3 mm ≤ H3 - H1 ≤ 2 mm.

[0034] In the above solution, the thickness H1 of the first zone and the maximum thickness H3 of the second zone satisfy the aforementioned relationship. This not only ensures high strength of the groove bottom wall, but also facilitates material flow during stamping, reducing manufacturing complexity. If H3-H1 is small (e.g., less than 0.3mm), the thickness of the second zone is thinner, making processing and manufacturing more difficult. If H3-H1 is large (e.g., greater than 2mm), the thickness of the first zone is thinner, resulting in lower strength, which can easily lead to premature cracking of the notch groove in the non-depressurized state, shortening its service life.

[0035] According to some embodiments of the present application, 0.5 mm ≤ H3 - H1 ≤ 1 mm.

[0036] In the above solution, compared with 0.3mm≤H3-H1≤2mm, when 0.5mm≤H3-H1≤1mm, the thickness of the second zone can be thicker, which is convenient for processing and manufacturing, and the strength of the groove bottom wall is higher.

[0037] According to some embodiments of the present application, the sink is a stepped groove, which includes a first groove section and a second groove section. The first groove section is closer to the first surface than the second groove section, and the groove bottom wall is the bottom wall of the second groove section.

[0038] In the above solution, the sink is a stepped groove, and the first area and the second area are located on the bottom wall of the second groove section, which is convenient for processing and manufacturing; when the sink is stamped, it is convenient for material accumulation and the processing and manufacturing difficulty is relatively low.

[0039] According to some embodiments of the present application, the difference between the groove width of the first groove section and the groove width of the second groove section is K1, which satisfies: 1mm≤K1≤8mm.

[0040] In the above solution, the width of the first and second slot segments satisfy the aforementioned relationship, facilitating fabrication and occupying a relatively small space. This facilitates material accumulation during the stamping of the recessed groove, making the stamping process relatively easy. If K1 is small (less than 1 mm), fabrication becomes more difficult, and the strength of the housing component at the recessed groove is reduced. If K1 is large (e.g., greater than 8 mm), the stepped surface between the first and second slot segments becomes larger, occupying a relatively large space and resulting in wasted material.

[0041] According to some embodiments of the present application, 4 mm ≤ K1 ≤ 6 mm.

[0042] In the above solution, compared with 1mm≤K1≤8mm, when 4mm≤K1≤6mm, on the one hand, it is convenient for processing and manufacturing, for example, it is convenient for material stacking during stamping; on the other hand, while the strength of the shell component at the groove is higher, the groove occupies a smaller space.

[0043] According to some embodiments of the present application, the groove depth of the first groove section is W1, which satisfies: 0.1 mm ≤ W1 ≤ 1 mm.

[0044] In the above scheme, the groove depth of the first groove section satisfies the above relationship and is convenient for processing and manufacturing. For example, it is convenient for stacking materials during stamping. If W1 is small (such as less than 0.1 mm), the processing technology requirements are high and it is not easy to process and manufacture. If W1 is large (such as greater than 1 mm), the groove depth of the second groove section is small, the thickness of the groove bottom wall is thinner, and the strength of the groove bottom wall is low.

[0045] According to some embodiments of the present application, 0.3 mm ≤ W1 ≤ 0.7 mm.

[0046] In the above solution, compared with 0.1mm≤W1≤1mm, when 0.3mm≤W1≤0.7mm, it is easy to process and manufacture, and the groove bottom wall has higher strength.

[0047] According to some embodiments of the present application, the groove depth of the second groove section is W2, which satisfies: 0.5 mm ≤ W2 ≤ 4 mm.

[0048] In the above scheme, the groove depth of the second groove section satisfies the above relationship, which is convenient for processing and manufacturing. For example, it is convenient for stacking materials during stamping. If the groove depth of the second groove section is small (such as less than 0.5 mm), the thickness of the groove bottom wall is thicker, and the processing difficulty of the notched groove is higher. If the groove depth of the second groove section is large (such as greater than 4 mm), the thickness of the groove bottom wall is thinner, and the strength of the groove bottom wall is lower.

[0049] According to some embodiments of the present application, 1.5 mm ≤ W2 ≤ 3 mm.

[0050] In the above solution, compared with 0.5mm≤W2≤4mm, when 1.5mm≤W2≤3mm, it is not only convenient for processing the notched groove, but also makes the thickness of the groove bottom wall thicker, and the groove bottom wall has higher strength.

[0051] According to some embodiments of the present application, the shell component also has a third surface, which is arranged opposite to the first surface along the thickness direction of the shell component. A convex portion is formed on the third surface, and the convex portion corresponds to the position of the groove. Along the thickness direction, the projection of the groove falls into the projection of the convex portion.

[0052] In the above solution, the provision of the convex portion facilitates the stamping and forming of the housing component, and the processing and manufacturing difficulty is relatively low.

[0053] According to some embodiments of the present application, a protrusion is formed on the first surface, which surrounds the groove. The shell component also has a third surface, which is arranged opposite to the first surface along the thickness direction of the shell component. A first groove is provided on the third surface at a position corresponding to the protrusion.

[0054] In the above solution, the protrusion can protect the sink and reduce the risk of impurities (such as electrolyte, etc.) entering the sink; the first groove corresponds to the position of the protrusion, the protrusion can be stamped, the processing and manufacturing difficulty is low, and the material is used reasonably.

[0055] According to some embodiments of the present application, the protrusion forms a second groove, the recessed groove is a stepped groove, the stepped groove includes a first groove section and a second groove section, the first groove section is closer to the first surface than the second groove section, the groove bottom wall is the bottom wall of the second groove section, and the difference between the groove width of the second groove and the groove width of the first groove section is K2, satisfying: 1mm≤K2≤8mm.

[0056] In the above scheme, the groove width of the second groove and the groove width of the first groove section satisfy the above relationship, the processing and manufacturing difficulty is low, and the second groove occupies a small space; if K2 is large (such as greater than 8mm), the structural space is wasted; if K2 is small (such as less than 1mm), the processing and manufacturing difficulty is high.

[0057] According to some embodiments of the present application, 2mm≤K2≤4mm.

[0058] In the above solution, compared with 1mm≤K2≤8mm, when 2mm≤K2≤4mm, the second groove occupies less space and is less difficult to manufacture.

[0059] According to some embodiments of the present application, the housing component is an end cover, which is used to close the opening of the housing of the battery cell.

[0060] According to some embodiments of the present application, the thickness of the second region is smaller than the thickness of the end cap.

[0061] In the above scheme, the thickness of the end cover refers to the thickness of the area of ​​the end cover where no through holes, stepped holes, recesses or other structures are set. In the embodiment where the shell component includes a third surface, the thickness of the end cover can be the distance between the first surface and the third surface in a direction perpendicular to the first surface. The thickness of the second area is less than the thickness of the end cover. The strength of the bottom wall of the groove can be weaker than the strength of the part of the end cover where no through holes, stepped holes, recesses or other structures are set, so that the scored groove on the bottom wall of the groove can be easily ruptured to release the pressure inside the battery cell when the battery cell thermally runs away.

[0062] According to some embodiments of the present application, the outer shell component is a shell, which includes multiple walls. The multiple walls together define a accommodating space for accommodating an electrode assembly of a battery cell, and the sink is provided in at least one of the multiple walls.

[0063] According to some embodiments of the present application, the thickness of the second region is smaller than the thickness of the wall portion where the sink is provided.

[0064] In the above scheme, the thickness of the wall portion with the groove refers to the thickness of the area of ​​the wall portion that is not provided with through holes, stepped holes, recesses and other structures. In the embodiment where the shell component includes a third surface, the thickness of the wall portion with the groove can be the distance between the first surface and the third surface in a direction perpendicular to the first surface. The thickness of the second area is less than the thickness of the wall portion with the groove. The strength of the groove bottom wall can be weaker than the strength of the part of the wall portion that is not provided with through holes, stepped holes, recesses and other structures, so that the scored groove on the groove bottom wall can be easily ruptured when the battery cell thermally runs away to release the pressure inside the battery cell.

[0065] In a second aspect, the present application also provides a battery cell, comprising the housing component provided in any of the above embodiments.

[0066] In a third aspect, the present application also provides a battery, comprising a battery cell provided by any of the above embodiments.

[0067] In a fourth aspect, the present application also provides an electrical device, comprising a battery provided in any of the above embodiments.

[0068] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0070] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0071] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0072] FIG3 is an exploded view of a battery cell provided in some embodiments of the present application;

[0073] FIG4 is a schematic structural diagram of a housing component provided in some embodiments of the present application;

[0074] FIG5 is a top view of a housing component provided in some embodiments of the present application;

[0075] FIG6 is a cross-sectional view taken along the AA direction of FIG5 ;

[0076] FIG7 is a top view of a housing component provided in some other embodiments of the present application;

[0077] FIG8 is a cross-sectional view of a sink of a housing component provided in some embodiments of the present application;

[0078] FIG9 is a cross-sectional view of a sink of a housing component provided in some other embodiments of the present application;

[0079] FIG10 is a schematic structural diagram of housing components provided in other embodiments of the present application;

[0080] In the drawings, the drawings are not drawn to scale.

[0081] Marking instructions: 100 - battery; 10 - housing; 11 - first sub-housing; 12 - second sub-housing; 20 - battery cell; 21 - housing; 211 - end cap; 21a - electrode terminal; 212 - housing; 2121 - peripheral wall; 2122 - bottom wall; 22 - electrode assembly; 221 - tab; 23 - housing component; 231 - first surface; 232 - sink; 2320 - bottom wall; 2321 - first zone; 2321a - first sub-zone domain; 2321b-second sub-region; 2322-second zone; 2322a-second surface; 2323-notched groove; 2323a-first sub-notched groove; 2323b-second sub-notched groove; 2323c-third sub-notched groove; 2324-first groove section; 2325-second groove section; 233-third surface; 234-protrusion; 235-protrusion; 236-first groove; 200-controller; 300-motor; 1000-vehicle. DETAILED DESCRIPTION

[0082] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0083] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0084] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0085] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0086] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces), unless otherwise clearly and specifically defined.

[0087] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present 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 and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0088] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0089] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0090] In this application, reference to a battery refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

[0091] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode current collector, and the current collector uncoated with the positive active material layer serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode current collector, and the current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative active material can be carbon or silicon, among others. To ensure that high currents can be passed without melting, multiple positive electrode tabs are stacked, and multiple negative electrode tabs are stacked. The material of the isolation film can be PP (polypropylene) or PE (polyethylene).

[0092] The battery cell further includes a housing component, which may be an end cover or a shell. The end cover closes an opening of the shell to define an accommodation space for accommodating the electrode assembly.

[0093] The development of battery technology must take into account multiple design factors at the same time, such as energy density, discharge capacity, charge and discharge rate and other performance parameters. In addition, the processing and manufacturing costs of the battery also need to be considered.

[0094] The processing and manufacturing costs of the shell components affect the processing and manufacturing costs of the battery cells. In the related art, in order to improve the safety of the battery cells, the shell components need to be provided with a pressure relief structure so as to release the pressure inside the battery cells when the battery cells are in thermal runaway. The processing and forming of the pressure relief structure of the shell components affects the processing and manufacturing costs of the shell components. The pressure relief structure is usually a weak part of the shell component. During the processing and manufacturing process, a certain area of ​​the shell component is usually processed into a weak part with a thinner thickness. For example, it is necessary to use a tool to cut and remove a certain thickness of material on the shell component, or it is necessary to punch a certain area of ​​the shell component into a thinner area. However, in order to release the pressure in time, the weak part needs to have a certain area. When the weak part has an increased area, no matter which processing method is used, it is difficult to process the shell component into a weak part with a thinner thickness, which makes the processing and manufacturing cost of the shell component higher, and then makes the processing and manufacturing cost of the battery cells higher.

[0095] In view of this, in order to solve the problem that the outer shell components are difficult to process and manufacture, resulting in high manufacturing costs of battery cells, the inventors have designed a technical solution after in-depth research. By setting the areas of the outer shell components where the pressure relief structure needs to be set to different thicknesses, the processing and manufacturing difficulty is reduced, thereby reducing the processing and manufacturing costs of the outer shell components.

[0096] In the above solution, the housing component includes a sink, which serves as a pressure relief structure. The bottom wall of the sink is divided into a first region and a second region of different thicknesses. At least a portion of the first region is provided with a notched groove. The thickness of the second region is greater than that of the first region, and the thickness of the second region can be consistent with the thickness of the first region without machining. This facilitates material flow and accumulation in the second region during stamping, thereby reducing the difficulty and cost of manufacturing the housing component, and thus reducing the manufacturing cost of the battery cell formed by the housing component. Furthermore, the thicker second region provides greater strength to the bottom wall, reducing the risk of premature rupture of the notched groove when the housing component is not in the pressure relief state, thereby extending the service life of the housing component.

[0097] The battery cells disclosed in the embodiments of the present application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical equipment.

[0098] The embodiments of the present application provide an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0099] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0100] Please refer to Figure 1, which is a schematic diagram of the structure of the vehicle provided in some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, such as for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0101] The vehicle 1000 may further include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0102] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0103] Please refer to Figure 2, which is an exploded view of a battery provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 being housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 can include a first sub-housing 11 and a second sub-housing 12, which cover each other and together define a storage space for accommodating the battery cell 20. The second sub-housing 12 can be a hollow structure with one end open, and the first sub-housing 11 can be a plate-like structure, with the first sub-housing 11 covering the open side of the second sub-housing 12, so that the first sub-housing 11 and the second sub-housing 12 jointly define a storage space; the first sub-housing 11 and the second sub-housing 12 can also be hollow structures with one end open, with the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0104] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0105] The battery cell 20 may be a secondary battery or a primary battery; the battery cell 20 may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0106] Please refer to Figure 3, which is an exploded view of a battery cell provided in some embodiments of the present application. As shown in Figure 3, a battery cell 20 includes a housing 21, an electrode assembly 22, and other functional components.

[0107] The housing 21 includes an end cover 211 and a shell 212 . The shell 212 has an opening, and the end cover 211 closes the opening.

[0108] The end cap 211 is a component that covers the opening of the housing 212 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 211 can be adapted to the shape of the housing 212 to fit the housing 212. Optionally, the end cap 211 can be made of a material with a certain hardness and strength (such as an aluminum alloy). This prevents the end cap 211 from deforming when subjected to compression or collision, giving the battery cell 20 greater structural strength and improved safety. Functional components such as the electrode terminal 21a can be provided on the end cap 211. The electrode terminal 21a can be used to electrically connect to the electrode assembly 22 to output or input electrical energy to the battery cell 20. The end cap 211 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, and aluminum alloy. In some embodiments, an insulating structure can be provided on the inside of the end cap 211 to isolate the electrical connection components within the housing 212 from the end cap 211 to reduce the risk of short circuits. For example, the insulating structure may be plastic, rubber, or the like.

[0109] The shell 212 is a component used to cooperate with the end cap 211 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, electrolyte and other components. The shell 212 and the end cap 211 can be independent components. The shell 212 can be of various shapes and sizes. Specifically, the shape of the shell 212 can be determined according to the specific shape and size of the electrode assembly 22. The material of the shell 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc. The embodiment of the present application is introduced as an example of a shell 212 with a rectangular shape.

[0110] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be contained in the housing 212. The electrode assembly 22 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The separator is used to separate the positive electrode sheet and the negative electrode sheet to avoid internal short circuits between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 22, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab 221. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 221 connects to the electrode terminal 21a to form a current loop.

[0111] Please refer to Figures 4 to 6. Figure 4 is a schematic structural diagram of a housing component provided in some embodiments of the present application, Figure 5 is a top view of a housing component provided in some embodiments of the present application, and Figure 6 is a cross-sectional view taken along the AA direction of Figure 5. According to some embodiments of the present application, the present application provides a housing component 23 for use with a battery cell 20 (see Figure 3). The housing component 23 has a first surface 231, and the first surface 231 is provided with a recessed groove 232. The bottom wall 2320 of the recessed groove 232 includes a first area 2321 and a second area 2322. The thickness of the first area 2321 is less than that of the second area 2322. At least a portion of the first area 2321 is provided with a notch groove 2323. The housing component 23 is configured to rupture at the notch groove 2323 to release pressure inside the battery cell 20.

[0112] The outer shell member 23 is a member constituting the outer shell of the battery cell 20 .

[0113] The sink 232 is a groove provided on the first surface 231, which is recessed from the first surface 231. The sink 232 is a pressure relief structure of the housing component 23. The thickness of the housing component 23 at the sink 232 is thinner than the thickness of other parts of the housing component 23. This allows the battery cell 20 formed by the housing component 23 to rupture at the notched groove 2323 of the sink 232 in the event of thermal runaway, thereby releasing the pressure inside the battery cell 20.

[0114] The first surface 231 is a surface of the shell component 23 , and the first surface 231 may be an outer surface of the shell component 23 . That is, when the shell component 23 and other components form a shell, the first surface 231 is a surface facing away from the inner space of the shell.

[0115] The groove bottom wall 2320 is arranged opposite to the opening of the sink groove 232 . The first area 2321 and the second area 2322 are components of the groove bottom wall 2320 . The first area 2321 and the second area 2322 have a certain thickness.

[0116] Since the shell component 23 needs to rupture when the battery cell 20 thermally runs away to release the pressure inside the battery cell 20, the thickness of the bottom wall 2320 of the sink 232 needs to be thinner. In the present application, the bottom wall 2320 of the sink 232 is divided into zones, and the thickness of the first zone 2321 and the second zone 2322 are different. The thickness of the first zone 2321 is thinner, and at least a portion of the first zone 2321 is provided with a notch groove 2323. The thickness of the second zone 2322 can be thicker, which reduces the difficulty of processing and manufacturing the shell component 23, reduces the processing and manufacturing cost, and thereby reduces the processing and manufacturing cost of the battery cell 20 formed by the shell component 23.

[0117] According to some embodiments of the present application, the first region 2321 surrounds at least a portion of the second region 2322 .

[0118] The first region 2321 may partially surround the second region 2322, or may completely surround the second region 2322. That is, the first region 2321 may be arranged around the edge of the second region 2322. The first region 2321 may circle the edge of the second region 2322 in a circle or less, facilitating the placement of the score groove 2323, and a relatively long score groove 2323 may be provided. Furthermore, the second region 2322 can open with the score groove 2323 as the boundary after the score groove 2323 ruptures, thereby forming a pressure relief channel. It should be noted that after the score groove 2323 ruptures, the rupture may be along the score groove 2323 or along the score groove 2323 and the surrounding area.

[0119] According to some embodiments of the present application, the first region 2321 connects the second region 2322 and the sidewall of the sink 232 .

[0120] The groove side wall of the groove 232 refers to the wall of the groove 232 surrounding the groove bottom wall 2320.

[0121] In the above solution, the first area 2321 is located between the side wall of the sink 232 and the second area 2322, which is convenient for processing and manufacturing. The first area 2321 can have a larger area, which is convenient for setting a longer notched groove 2323 and facilitating pressure release.

[0122] According to some embodiments of the present application, the score groove 2323 surrounds at least a portion of the second region 2322 .

[0123] The score groove 2323 may surround a portion of the second region 2322, or the score groove 2323 may surround the entire second region 2322. When the score groove 2323 surrounds the second region 2322, when the battery cell 20 experiences thermal runaway, the score groove 2323 ruptures, and the second region 2322 is separated from the first region 2321, thereby providing the housing component 23 with a larger pressure relief area.

[0124] In the above solution, the notched groove 2323 surrounds at least a portion of the second area 2322 , and the notched groove 2323 can have a longer length to facilitate the opening of the second area 2322 , so as to facilitate timely pressure relief after the notched groove 2323 ruptures.

[0125] Referring to FIG. 5 , according to some embodiments of the present application, the notched groove 2323 is a closed annular groove.

[0126] The notched groove 2323 is a closed annular groove, and the trajectory of the notched groove 2323 is annular and arranged around the second area 2322 , that is, the notched groove 2323 surrounds the second area 2322 .

[0127] The notch groove 2323 has a long length, which facilitates the rupture of the outer shell component 23 to release pressure when the battery cell 20 experiences thermal runaway. After the notch groove 2323 ruptures, the second area 2322 opens to form a larger pressure relief channel.

[0128] In the above solution, the notched groove 2323 is a closed annular groove, which facilitates the rupture of the notched groove 2323 and the opening of the second area 2322. After the notched groove 2323 is ruptured, a larger pressure relief channel is formed.

[0129] Please refer to Figure 7, which is a top view of a housing component provided in some other embodiments of the present application. According to some embodiments of the present application, there are two second regions 2322, and the first region 2321 includes a first sub-region 2321a and a second sub-region 2321b. The first sub-region 2321a is an annular structure, surrounding the two second regions 2322. The second sub-region 2321b is located between the two second regions 2322, and the two ends of the second sub-region 2321b are respectively connected to the first sub-region 2321a.

[0130] The first sub-region 2321a and the second sub-region 2321b are components of the first region 2321. The first sub-region 2321a surrounds the two second regions 2322 and the second sub-region 2321b. Both ends of the second sub-region 2321b are respectively connected to the first sub-region 2321a. The second sub-region 2321b separates the two second regions 2322.

[0131] The notch groove 2323 may be provided in the first sub-region 2321a, or the notch groove 2323 may be provided in the second sub-region 2321b, or the notch groove 2323 may be provided in both the first sub-region 2321a and the second sub-region 2321b.

[0132] The extension direction of the notch groove 2323 can be consistent with the extension direction of the first sub-region 2321a. For example, when the notch groove 2323 is set in the first sub-region 2321a, the notch groove 2323 can be set in a part of the first sub-region 2321a, or the notch groove 2323 can surround the two second regions 2322.

[0133] In the above scheme, the first sub-region 2321a surrounds the two second regions 2322, and the second sub-region 2321b is located between the two second regions 2322. The setting position of the notch groove 2323 is flexible, which is convenient for pressure release; at the same time, when the shell part 23 is stamped and formed, the stress is concentrated at the connection between the second sub-region 2321b and the first sub-region 2321a, which is easy to break and convenient for pressure release.

[0134] Please refer to Figure 7. According to some embodiments of the present application, the notch groove 2323 includes a first sub-notch groove 2323a, a second sub-notch groove 2323b and a third sub-notch groove 2323c. The first sub-notch groove 2323a and the second sub-notch groove 2323b are arranged in the first sub-region 2321a, and the third sub-notch groove 2323c is arranged in the second sub-region 2321b. The two second regions 2322 are located between the first sub-notch groove 2323a and the second sub-notch groove 2323b, and the two ends of the third sub-notch groove 2323c are respectively connected to the first sub-notch groove 2323a and the second sub-notch groove 2323b.

[0135] The first sub-score groove 2323a and the second sub-score groove 2323b are disposed in the first sub-region 2321a and along the extending direction of the first sub-region 2321a. The first sub-score groove 2323a and the second sub-score groove 2323b are disposed on opposite sides of the two regions.

[0136] The third sub-score groove 2323c is arranged in the second sub-area 2321b, and the two ends of the third sub-score groove 2323c are respectively connected to the first sub-score groove 2323a and the second sub-score groove 2323b. The intersection of the third sub-score groove 2323c and the first sub-score groove 2323a and the intersection of the third sub-score groove 2323c and the second sub-score groove 2323b are easier to break than other parts.

[0137] In the above solution, the first sub-score groove 2323a, the second sub-score groove 2323b and the third sub-score groove 2323c are arranged at different positions so as to increase the rupture area of ​​the shell component 23 and facilitate pressure relief.

[0138] Referring to FIG. 7 , according to some embodiments of the present application, the first sub-score groove 2323 a and the second sub-score groove 2323 b are arranged in parallel.

[0139] The third sub-score groove 2323c intersects the first sub-score groove 2323a and the second sub-score groove 2323b. The third sub-score groove 2323c may be perpendicular to the first sub-score groove 2323a and the second sub-score groove 2323b. As shown in FIG. 7 , the score groove 2323 may be in an I-shape.

[0140] In the above solution, the first sub-score groove 2323a and the second sub-score groove 2323b are arranged in parallel to form an enclosure for the second area 2322, which is convenient for opening the second area 2322 and is easy to process and manufacture.

[0141] Please refer to Figures 8 and 9. Figure 8 is a cross-sectional view of a sink groove of a housing component provided in some embodiments of the present application, and Figure 9 is a cross-sectional view of a sink groove of a housing component provided in other embodiments of the present application. According to some embodiments of the present application, the second region 2322 protrudes from the first region 2321 toward the opening of the sink groove 232, and the opening is disposed opposite the bottom wall 2320 of the groove.

[0142] The sink 232 is provided on the first surface 231 . The opening of the sink 232 is located on the first surface 231 . The opening is arranged opposite to the bottom wall 2320 . The opening and the bottom wall 2320 may be located at opposite ends of the sink 232 .

[0143] The second area 2322 protrudes from the first area 2321 toward the opening of the sink 232 , and at least a portion of a surface of the second area 2322 facing the opening is closer to the opening than a surface of the first area 2321 facing the opening.

[0144] In the above solution, the second area 2322 protrudes from the first area 2321 in the direction toward the opening of the sink 232, which is convenient for processing and manufacturing, for example, convenient for stamping.

[0145] Referring to FIG. 8 , according to some embodiments of the present application, the second region 2322 has a second surface 2322 a facing the opening, and the second surface 2322 a is a plane.

[0146] The second surface 2322a is a surface of the second area 2322 facing the opening. The second surface 2322a is a plane, has a simple structure, and is easy to process.

[0147] According to some embodiments of the present application, the thickness of the first region 2321 is H1, and the thickness of the second region 2322 is H2, satisfying: 0.3 mm ≤ H2 - H1 ≤ 1.5 mm.

[0148] The thickness of the first region 2321 refers to a dimension of the first region 2321 in a direction perpendicular to the first surface 231 .

[0149] The thickness of the second region 2322 refers to a dimension of the second region 2322 in a direction perpendicular to the first surface 231 .

[0150] In the above solution, the thickness H1 of the first region 2321 and the thickness H2 of the second region 2322 satisfy the aforementioned relationship. This not only ensures greater strength for the groove bottom wall 2320 but also facilitates material flow during stamping, reducing manufacturing complexity. If H2-H1 is small (e.g., less than 0.3 mm), the thickness of the second region 2322 is relatively thin, making processing and manufacturing more difficult. If H2-H1 is large (e.g., greater than 1.5 mm), the thickness of the first region 2321 is relatively thin, resulting in lower strength and a tendency for the notch groove 2323 to crack prematurely when not in a pressure relief state, thus reducing service life.

[0151] Alternatively, H2-H1 may be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm.

[0152] According to some embodiments of the present application, 0.5 mm ≤ H2 - H1 ≤ 1 mm.

[0153] Alternatively, H2-H1 may be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm or 1 mm.

[0154] Compared to 0.3 mm ≤ H2 − H1 ≤ 1.5 mm, when 0.5 mm ≤ H2 − H1 ≤ 1 mm, the second region 2322 can have a thicker thickness, which is convenient for processing and manufacturing, and the strength of the groove bottom wall 2320 is higher.

[0155] Referring to FIG. 9 , according to some embodiments of the present application, the second region 2322 has a second surface 2322 a facing the opening, and the second surface 2322 a is a curved surface that arches toward the opening.

[0156] The second surface 2322a is a surface of the second region 2322 facing the opening, and the second surface 2322a is arched toward the opening. For example, the second surface 2322a may be a curved surface.

[0157] In the above solution, the second surface 2322a is arched toward the opening, and the second area 2322 has high strength, is easy to process and manufacture, and has low difficulty in processing and manufacturing.

[0158] According to some embodiments of the present application, the thickness of the first region 2321 is H1, and the maximum thickness of the second region 2322 is H3, satisfying: 0.3 mm ≤ H3 - H1 ≤ 2 mm.

[0159] The maximum thickness of the second region 2322 refers to the maximum dimension of the second region 2322 in a direction perpendicular to the first surface 231 .

[0160] In the above solution, the thickness H1 of the first region 2321 and the maximum thickness H3 of the second region 2322 satisfy the aforementioned relationship. This not only ensures greater strength for the groove bottom wall 2320 but also facilitates material flow during stamping, reducing manufacturing complexity. If H3-H1 is small (e.g., less than 0.3 mm), the thickness of the second region 2322 is relatively thin, making processing and manufacturing more difficult. If H3-H1 is large (e.g., greater than 2 mm), the thickness of the first region 2321 is relatively thin, resulting in lower strength and a tendency for the notch groove 2323 to crack prematurely when not in a pressure-relief state, thus reducing service life.

[0161] Alternatively, H3-H1 may be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2 mm.

[0162] According to some embodiments of the present application, 0.5 mm ≤ H3 - H1 ≤ 1 mm.

[0163] Alternatively, H3-H1 may be 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm or 1 mm.

[0164] In the above solution, compared with 0.3mm≤H3-H1≤2mm, when 0.5mm≤H3-H1≤1mm, the thickness of the second region 2322 can be thicker, which is convenient for processing and manufacturing, and the strength of the groove bottom wall 2320 is higher.

[0165] Please refer to Figures 8 and 9. According to some embodiments of the present application, the sink 232 is a stepped groove, which includes a first groove section 2324 and a second groove section 2325. The first groove section 2324 is closer to the first surface 231 than the second groove section 2325, and the groove bottom wall 2320 is the bottom wall of the second groove section 2325.

[0166] The first trough section 2324 and the second trough section 2325 are two-stage trough sections of the sink 232 . The first trough section 2324 is connected to the second trough section 2325 . A step surface facing the opening of the sink 232 is formed between the first trough section 2324 and the second trough section 2325 .

[0167] In the above solution, the sink 232 is a stepped groove, and the first area 2321 and the second area 2322 are located on the bottom wall of the second groove section 2325, which is convenient for processing and manufacturing; when the sink 232 is stamped, it is convenient for material accumulation and the processing and manufacturing difficulty is relatively low.

[0168] According to some embodiments of the present application, the difference between the slot width of the first slot segment 2324 and the slot width of the second slot segment 2325 is K1, which satisfies: 1 mm ≤ K1 ≤ 8 mm.

[0169] As shown in Figures 8 and 9, the groove width K11 of the first groove section 2324 refers to the dimension of the first groove section 2324 in a direction parallel to the first surface 231 in a cross section cut by a plane perpendicular to the first surface 231 and passing through the central axis of the sink 232.

[0170] The groove width K12 of the second groove section 2325 refers to the dimension of the second groove section 2325 in a direction parallel to the first surface 231 (for example, the left and right direction as shown in Figure 5) in a cross section cut by a plane perpendicular to the first surface 231 and passing through the central axis of the groove 232.

[0171] For the convenience of description, K11 and K12 are shown in FIG8 and FIG9 , based on which K1=K11−K12.

[0172] In the above embodiment, the width of the first groove section 2324 and the width of the second groove section 2325 satisfy the aforementioned relationship, facilitating fabrication and occupying a relatively small space. This facilitates material accumulation during stamping of the recessed groove 232, making stamping less difficult. If K1 is relatively small (less than 1 mm), fabrication becomes more difficult, and the strength of the housing component 23 at the recessed groove 232 is reduced. If K1 is relatively large (e.g., greater than 8 mm), the stepped surface between the first groove section 2324 and the second groove section 2325 becomes larger, occupying a relatively large space and resulting in wasted material.

[0173] Alternatively, K1 may be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, or 8 mm.

[0174] According to some embodiments of the present application, 4 mm ≤ K1 ≤ 6 mm.

[0175] Alternatively, K1 may be 4 mm, 4.25 mm, 4.5 mm, 4.75 mm, 5 mm, 5.25 mm, 5.5 mm, 5.75 mm, or 6 mm.

[0176] Compared with 1mm≤K1≤8mm, when 4mm≤K1≤6mm, on the one hand, it is convenient for processing and manufacturing, for example, it is convenient for material stacking during stamping; on the other hand, while the strength of the shell component 23 at the groove 232 is higher, the groove 232 occupies a smaller space.

[0177] 8 and 9 , according to some embodiments of the present application, the groove depth of the first groove section 2324 is W1, which satisfies the following: 0.1 mm ≤ W1 ≤ 1 mm.

[0178] The sinking groove 232 is provided on the first surface 231 . The depth of the sinking groove 232 may be perpendicular to the first surface 231 . The depth of the first groove section 2324 refers to the dimension of the first groove section 2324 in the direction perpendicular to the first surface 231 .

[0179] Alternatively, W1 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm.

[0180] In the above embodiment, the groove depth of the first groove section 2324 satisfies the above relationship, facilitating processing and manufacturing. For example, it facilitates material accumulation during stamping. If W1 is small (e.g., less than 0.1 mm), the processing requirements are high and manufacturing is difficult. If W1 is large (e.g., greater than 1 mm), the groove depth of the second groove section 2325 is small, the thickness of the groove bottom wall 2320 is thin, and the strength of the groove bottom wall 2320 is low.

[0181] According to some embodiments of the present application, 0.3 mm ≤ W1 ≤ 0.7 mm.

[0182] Alternatively, W1 may be 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm or 0.7 mm.

[0183] In the above solution, compared with 0.1 mm ≤ W1 ≤ 1 mm, when 0.3 mm ≤ W1 ≤ 0.7 mm, it is easy to process and manufacture, and the groove bottom wall 2320 has higher strength.

[0184] 8 and 9 , according to some embodiments of the present application, the groove depth of the second groove section 2325 is W2, which satisfies: 0.5 mm ≤ W2 ≤ 4 mm.

[0185] The sinking groove 232 is provided on the first surface 231 . The depth of the sinking groove 232 may be perpendicular to the first surface 231 . The depth of the second groove section 2325 refers to the dimension of the second groove section 2325 in the direction perpendicular to the first surface 231 .

[0186] Alternatively, W2 may be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, or 4 mm.

[0187] In the above scheme, the groove depth of the second groove section 2325 satisfies the above relationship, which is convenient for processing and manufacturing. For example, it is convenient for stacking materials during stamping. If the groove depth of the second groove section 2325 is small (such as less than 0.5 mm), the thickness of the groove bottom wall 2320 is thicker, and the processing difficulty of the notched groove 2323 is higher. If the groove depth of the second groove section 2325 is large (such as greater than 4 mm), the thickness of the groove bottom wall 2320 is thinner, and the strength of the groove bottom wall 2320 is lower.

[0188] According to some embodiments of the present application, 1.5 mm ≤ W2 ≤ 3 mm.

[0189] Alternatively, W2 may be 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, or 3 mm.

[0190] In the above solution, compared with 0.5mm≤W2≤4mm, when 1.5mm≤W2≤3mm, it is convenient for processing the notched groove 2323 and also makes the groove bottom wall 2320 thicker, and the groove bottom wall 2320 has higher strength.

[0191] According to some embodiments of the present application, the shell component 23 further has a third surface 233, which is arranged opposite to the first surface 231 along the thickness direction of the shell component 23. The third surface 233 is formed with a protrusion 234, and the protrusion 234 corresponds to the position of the groove 232. Along the thickness direction, the projection of the groove 232 falls into the projection of the protrusion 234.

[0192] In the figure, the direction indicated by letter Z is the thickness direction of the housing member 23. The third surface 233 and the first surface 231 are surfaces of the housing member 23 that are perpendicular to the thickness direction of the housing member 23.

[0193] The protrusion 234 is formed on the third surface 233 and protrudes from the third surface 233. The protrusion 234 corresponds to the position of the recessed groove 232. Along the thickness direction, the projection of the recessed groove 232 falls into the projection of the protrusion 234. When the housing component 23 is manufactured, the recessed groove 232 can be formed on the first surface 231 and the protrusion 234 can be formed on the third surface 233 by stamping.

[0194] In the above solution, the provision of the protrusion 234 facilitates the stamping and forming of the housing component 23 , and the difficulty of processing and manufacturing is relatively low.

[0195] Please refer to Figures 8 and 9. According to some embodiments of the present application, a protrusion 235 is formed on the first surface 231, and the protrusion 235 surrounds the groove 232. The shell component 23 also has a third surface 233. The third surface 233 and the first surface 231 are arranged opposite to each other along the thickness direction of the shell component 23. The third surface 233 is provided with a first groove 236 at a position corresponding to the protrusion 235.

[0196] The protrusion 235 is formed on the first surface 231 and protrudes from the first surface 231 . The protrusion 235 is disposed around the recess 232 .

[0197] The third surface 233 and the first surface 231 are surfaces of the housing member 23 that are perpendicular to the thickness direction of the housing member 23 .

[0198] The first groove 236 is a groove provided on the third surface 233 . The first groove 236 corresponds to the protrusion 235 in the thickness direction of the housing component 23 .

[0199] In the above solution, the protrusion 235 can protect the sink 232 and reduce the risk of impurities (such as electrolyte, etc.) entering the sink 232; the first groove 236 corresponds to the position of the protrusion 235, and the protrusion 235 can be stamped and formed, with low processing and manufacturing difficulty and reasonable use of materials.

[0200] In addition, the provision of the protrusion 235 facilitates the installation of a protective member to protect the sink 232 .

[0201] According to some embodiments of the present application, the protrusion 235 forms a second groove, the recessed groove 232 is a stepped groove, the stepped groove includes a first groove section 2324 and a second groove section 2325, the first groove section 2324 is closer to the first surface 231 than the second groove section 2325, the groove bottom wall 2320 is the bottom wall of the second groove section 2325, and the difference between the groove width of the second groove and the groove width of the first groove section 2324 is K2, satisfying: 1mm≤K2≤8mm.

[0202] A step surface is formed between the first trough section 2324 and the second trough section 2325 , and the step surface is disposed facing the opening of the sink 232 . The first area 2321 and the second area 2322 are disposed on the bottom wall of the second trough section 2325 .

[0203] The groove width K21 of the second groove refers to a dimension of the second groove in a direction parallel to the first surface 231 in a cross section cut by a plane perpendicular to the first surface 231 and passing through the central axis of the second groove.

[0204] The groove width K11 of the first groove section 2324 refers to the dimension of the first groove section 2324 in a direction parallel to the first surface 231 in a cross section cut by a plane perpendicular to the first surface 231 and passing through the central axis of the recessed groove 232 .

[0205] The central axis of the second groove is collinear with the central axis of the sink 232. The difference between the groove width of the second groove and the groove width of the first groove section 2324 refers to the difference between the size of the second groove in a direction parallel to the first surface 231 and the size of the first groove section 2324 in a direction parallel to the first surface 231 in a cross section cut by a plane perpendicular to the first surface 231 and passing through the central axis of the sink 232.

[0206] For ease of description, K11 and K21 are shown in FIG8 and FIG9 , based on which K2 = K21 − K11.

[0207] In the above scheme, the groove width of the second groove and the groove width of the first groove section 2324 satisfy the above relationship, the processing and manufacturing difficulty is low, and the second groove occupies a small space; if K2 is large (such as greater than 8mm), the structural space is wasted; if K2 is small (such as less than 1mm), the processing accuracy requirements are high, and the processing and manufacturing difficulty is high.

[0208] Optionally, K2 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm and 8mm.

[0209] According to some embodiments of the present application, 2mm≤K2≤4mm.

[0210] Alternatively, K2 may be 2 mm, 2.25 mm, 2.5 mm, 2.75 mm, 3 mm, 3.25 mm, 3.5 mm, 3.75 mm, or 4 mm.

[0211] In the above solution, compared with 1mm≤K2≤8mm, when 2mm≤K2≤4mm, the second groove occupies less space and is less difficult to manufacture.

[0212] 4 to 7 , according to some embodiments of the present application, the outer shell component 23 is an end cover 211 , and the end cover 211 is used to close the opening of the shell 212 of the battery cell 20 .

[0213] The first surface 231 may be the outer surface of the end cap 211, and the third surface 233 may be the inner surface of the end cap 211; or the first surface 231 may be the inner surface of the end cap 211, and the third surface 233 may be the outer surface of the end cap 211. The outer surface of the end cap 211 is the surface of the end cap 211 facing away from the housing 212, and the inner surface of the end cap 211 is the surface of the end cap 211 facing the housing 212.

[0214] In the above solution, the end cover 211 has a pressure relief function. By providing the notched groove 2323 on the end cover 211 , a pressure relief structure is formed. The pressure relief structure has good stability and good long-term reliability.

[0215] In some embodiments, the first surface 231 is the surface of the end cap 211 facing away from the housing 212. The surface of the end cap 211 facing away from the housing 212 is the outer surface of the end cap 211. Even if the outer surface of the end cap 211 is blocked by an obstacle, the scored groove 2323 can still rupture to release the pressure inside the battery cell 20.

[0216] According to some embodiments of the present application, the thickness of the second region 2322 is smaller than the thickness of the end cover 211 .

[0217] The thickness of the end cap 211 refers to the thickness of the region of the end cap 211 that is not provided with through-holes, stepped holes, recesses, or other structures. In embodiments where the housing component 23 includes a third surface 233, the thickness of the end cap 211 may be the distance between the first surface 231 and the third surface 233 in a direction perpendicular to the first surface 231. The thickness of the second region 2322 may be the maximum thickness of the groove bottom wall 2320. When the second surface 2322a of the second region 2322 is curved, the thickness of the second region 2322 may be the maximum thickness of the second region 2322.

[0218] The thickness of the second area 2322 is less than the thickness of the end cover 211, and the strength of the groove bottom wall 2320 can be weaker than the strength of the part of the end cover 211 that is not provided with through holes, stepped holes, recesses and other structures, so that the notched groove 2323 of the groove bottom wall 2320 can be easily broken when the battery cell 20 thermally runs away, so as to release the pressure inside the battery cell 20.

[0219] Please refer to Figures 3 and 10. Figure 10 is a schematic structural diagram of a housing component provided in some other embodiments of the present application. According to some embodiments of the present application, the housing component 23 is a shell 212. The shell 212 includes multiple walls that collectively define a storage space for accommodating the electrode assembly 22 of the battery cell 20. The sink 232 is provided in at least one of the multiple walls.

[0220] In the housing 212, the recessed groove 232 can be provided on one wall portion or on multiple wall portions. If the recessed groove 232 is provided on multiple wall portions, the housing 212 will correspondingly have multiple first surfaces 231. The first surface 231 can be the outer surface of the wall portion or the inner surface of the wall portion. The outer surface of the wall portion is the surface of the wall portion facing away from the electrode assembly 22, while the inner surface of the wall portion is the surface of the wall portion facing the electrode assembly 22.

[0221] In the above solution, the outer shell component 23 has both the function of accommodating the electrode assembly 22 and the function of releasing pressure.

[0222] In some embodiments, the shell 212 includes a peripheral wall 2121 and a bottom wall 2122. The peripheral wall 2121 is arranged around the edge of the bottom wall 2122. The peripheral wall 2121 and the bottom wall 2122 together define a accommodating space. An opening is formed at the end opposite to the peripheral wall 2121 and the bottom wall 2122, and the sink 232 is arranged on the bottom wall 2122.

[0223] The peripheral wall 2121 surrounds the edge of the bottom wall 2122, so that the housing 212 forms an opening at one end opposite the bottom wall 2122. The end cap 211 is used to cover the opening. The peripheral wall 2121 and the bottom wall 2122 are an integrally formed structure.

[0224] In an embodiment in which the housing 212 is cylindrical, the housing 212 may have two walls, one of which is a bottom wall 2122, and the other is a cylindrical peripheral wall 2121. In an embodiment in which the housing 212 is a rectangular parallelepiped, the housing 212 may have five walls, including a bottom wall 2122 and four side walls, which are connected end to end to form the peripheral wall 2121.

[0225] In the above solution, since the sink 232 is provided on the bottom wall 2122 , the bottom wall 2122 of the shell 212 has a pressure relief function, which facilitates the relief of the pressure inside the accommodating space.

[0226] In some embodiments, the first surface 231 is an outer surface of the wall.

[0227] It can be understood that in the embodiment where the sink 232 is disposed on the bottom wall 2122 , the first surface 231 is the outer surface of the bottom wall 2122 .

[0228] When forming the recessed groove 232 and the notched groove 2323 on the wall portion, the notched groove 2323 can be formed on the outer side of the wall portion, which is more convenient.

[0229] According to some embodiments of the present application, the thickness of the second region 2322 is smaller than the thickness of the wall portion where the sink 232 is provided.

[0230] The thickness of the wall portion where the recessed groove 232 is located refers to the thickness of the wall portion not provided with through-holes, stepped holes, recessed portions, or other structures. In embodiments where the housing component 23 includes a third surface 233, the thickness of the wall portion where the recessed groove 232 is located can be the distance between the first surface 231 and the third surface 233 in a direction perpendicular to the first surface 231. The thickness of the second region 2322 can be the maximum thickness of the groove bottom wall 2320. When the second surface 2322a of the second region 2322 is curved, the thickness of the second region 2322 can be the maximum thickness of the second region 2322.

[0231] The thickness of the second zone 2322 is smaller than the thickness of the wall portion where the sink 232 is provided, and the strength of the bottom wall 2320 of the groove may be weaker than the strength of the portion of the wall portion where no through holes, stepped holes, recesses or other structures are provided, so that the notched groove 2323 of the bottom wall 2320 of the groove can be easily broken when the battery cell 20 thermally runs away, thereby releasing the pressure inside the battery cell 20.

[0232] According to some embodiments of the present application, the embodiments of the present application further provide a battery cell 20 , comprising the housing component 23 provided in any of the above embodiments.

[0233] According to some embodiments of the present application, an embodiment of the present application further provides a battery, comprising the battery cell 20 provided in any of the above embodiments.

[0234] According to some embodiments of the present application, an electric device is further provided, comprising the battery 100 provided in any of the above embodiments.

[0235] The power-consuming device can be any of the above-mentioned devices using batteries.

[0236] According to some embodiments of the present application, please refer to Figures 3 to 9. The embodiments of the present application provide an end cover 211, which has a first surface 231 and a third surface 233 relative to each other in its thickness direction. The first surface 231 is provided with a groove 232, and the third surface 233 is formed with a convex portion 234. The convex portion 234 corresponds to the position of the groove 232. Along the thickness direction, the projection of the groove 232 falls into the projection of the convex portion 234. The sunken groove 232 is a stepped groove comprising a first groove section 2324 and a second groove section 2325. The first groove section 2324 is closer to the first surface 231 than the second groove section 2325. The bottom wall 2122 of the second groove section 2325 serves as the bottom wall 2320 of the sunken groove 232. The bottom wall 2320 comprises a first region 2321 and a second region 2322. The first region 2321 surrounds the second region 2322 and connects the second region 2322 to the sidewall of the sunken groove 232. The scored groove 2323 surrounds the first region 2321 and surrounds the second region 2322. The thickness of the first region 2321 is less than that of the second region 2322. The second area 2322 protrudes from the first area 2321 toward the opening of the sink 232 , and the opening is arranged opposite to the bottom wall 2320 . The second area 2322 has a second surface 2322 a facing the opening, and the second surface 2322 a is flat.

[0237] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A housing component for a battery cell, the housing component having a first surface, the first surface being provided with a recessed groove, the bottom wall of the recessed groove comprising a first region and a second region, the thickness of the first region being less than that of the second region, at least a portion of the first region being provided with a scored groove, the housing component being configured to rupture at the scored groove to release pressure inside the battery cell.

2. The housing component according to claim 1, wherein The first region surrounds at least a portion of the second region.

3. The housing component according to claim 2, wherein The first area connects the second area and a side wall of the sink.

4. The housing component according to claim 2, wherein The score groove surrounds at least a portion of the second region.

5. The housing component according to claim 4, wherein The notched groove is a closed annular groove.

6. The housing component according to any one of claims 1 to 4, wherein: There are two second areas, the first area includes a first sub-area and a second sub-area, the first sub-area is a ring structure, the first sub-area surrounds two second areas, the second sub-area is located between the two second areas, and both ends of the second sub-area are respectively connected to the first sub-area.

7. The housing component according to claim 6, wherein The notch groove includes a first sub-notch groove, a second sub-notch groove and a third sub-notch groove, the first sub-notch groove and the second sub-notch groove are arranged in the first sub-area, the third sub-notch groove is arranged in the second sub-area, the two second areas are located between the first sub-notch groove and the second sub-notch groove, and the two ends of the third sub-notch groove are respectively connected to the first sub-notch groove and the second sub-notch groove.

8. The housing component according to claim 7, wherein The first sub-score groove and the second sub-score groove are arranged in parallel.

9. The housing component according to any one of claims 1 to 8, wherein: The second area protrudes from the first area in a direction toward an opening of the sink, and the opening is arranged opposite to the bottom wall of the sink.

10. The housing component according to claim 9, wherein The second region has a second surface facing the opening, and the second surface is a plane.

11. The housing component according to claim 10, wherein The thickness of the first area is H1, and the thickness of the second area is H2, which satisfies the following: 0.3 mm ≤ H2 - H1 ≤ 1.5 mm.

12. The housing component according to claim 11, wherein 0.5mm≤H2-H1≤1mm.

13. The housing component according to claim 9, wherein The second region has a second surface facing the opening, and the second surface is a curved surface arched toward the opening.

14. The housing component according to claim 13, wherein The thickness of the first zone is H1, and the maximum thickness of the second zone is H3, satisfying the following: 0.3 mm ≤ H3 - H1 ≤ 2 mm.

15. The housing component according to claim 14, wherein 0.5mm≤H3-H1≤1mm.

16. The housing component according to any one of claims 1 to 15, wherein: The sinking groove is a stepped groove, which includes a first groove section and a second groove section. The first groove section is closer to the first surface than the second groove section, and the groove bottom wall is the bottom wall of the second groove section.

17. The housing component according to claim 16, wherein The difference between the groove width of the first groove section and the groove width of the second groove section is K1, which satisfies: 1mm≤K1≤8mm.

18. The housing component according to claim 17, wherein 4mm≤K1≤6mm.

19. The housing component according to any one of claims 16 to 18, wherein: The groove depth of the first groove section is W1, which satisfies: 0.1 mm ≤ W1 ≤ 1 mm.

20. The housing component according to claim 19, wherein 0.3mm≤W1≤0.7mm.

21. The housing component according to any one of claims 16 to 20, wherein The groove depth of the second groove section is W2, which satisfies: 0.5 mm ≤ W2 ≤ 4 mm.

22. The housing component according to claim 21, wherein 1.5mm≤W2≤3mm.

23. The housing component according to any one of claims 1 to 22, wherein: The shell component further has a third surface, which is arranged opposite to the first surface along the thickness direction of the shell component. A convex portion is formed on the third surface, and the convex portion corresponds to the position of the sinking groove. Along the thickness direction, the projection of the sinking groove falls into the projection of the convex portion.

24. The housing component according to any one of claims 1 to 23, wherein The first surface is formed with a protrusion, which surrounds the sink. The shell component also has a third surface, which is arranged opposite to the first surface along the thickness direction of the shell component. The third surface is provided with a first groove at a position corresponding to the protrusion.

25. The housing component according to claim 24, wherein The protrusions form a second groove, the recessed groove is a stepped groove, the stepped groove includes a first groove section and a second groove section, the first groove section is closer to the first surface than the second groove section, the groove bottom wall is the bottom wall of the second groove section, and the difference between the groove width of the second groove and the groove width of the first groove section is K2, satisfying: 1mm≤K2≤8mm.

26. The housing component according to claim 25, wherein 2mm≤K2≤4mm.

27. The housing component according to any one of claims 1 to 26, wherein The housing component is an end cover, which is used to close the opening of the housing of the battery cell.

28. The housing component according to claim 27, wherein The thickness of the second region is smaller than the thickness of the end cap.

29. The housing component according to any one of claims 1 to 26, wherein The outer shell component is a shell, which includes a plurality of wall portions. The plurality of wall portions together define a receiving space for receiving the electrode assembly of the battery cell. The sink is provided in at least one of the plurality of wall portions.

30. The housing component according to claim 29, wherein The thickness of the second region is smaller than the thickness of the wall portion where the sink is provided.

31. A battery cell comprising the housing component according to any one of claims 1 to 30.

32. A battery comprising the battery cell according to claim 31.

33. An electrical device comprising the battery according to claim 32.

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