Pressure relief component, battery cell, battery, and electric device

Abstract

A pressure relief component (23), a battery cell (20), a battery (100), and an electric device. The pressure relief component (23) is provided with a score groove (231); the score groove (231) extends along a closed trajectory and defines a pressure relief area; the score groove (231) comprises a first groove section (2311) and a second groove section (2312), and the first groove section (2311) and the second groove section (2312) are both arc sections, such that the first groove section (2311) and the second groove section (2312) extend smoothly, and stress concentration points are not prone to formation, thereby reducing the possibility of premature cracking caused by the stress concentration of the first groove section (2311) and the second groove section (2312), prolonging the service life of the battery cell (20). In addition, the first groove section (2311) is bent towards a center point of the pressure relief area, and the acting force borne by the first groove section (2311) is smaller, such that the possibility of the pressure relief area deforming under force is smaller, and the possibility of premature cracking of the score groove (231) is smaller. The second groove section (2312) is bent away from the center point of the pressure relief area, such that the area of the pressure relief area is larger, and a larger pressure relief channel can be formed after the score groove (231) is opened under force, thereby reducing the possibility of thermal runaway or even explosion of the battery cell (20).

Description

Pressure relief components, battery cells, batteries and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application CN202311621350.5, entitled “Pressure relief component, battery cell, battery and electrical equipment,” filed on November 28, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a pressure relief component, a battery cell, a battery, and an electrical device. Background Art

[0004] 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.

[0005] In battery technology, how to extend the service life of batteries is a technical problem that needs to be solved urgently.

[0006] Utility Model Content

[0007] The embodiments of the present application provide a pressure relief component, a battery cell, a battery, and an electrical device, which can reduce the possibility of the notched groove of the pressure relief component cracking and releasing pressure prematurely, thereby extending the service life of the battery.

[0008] In a first aspect, the present application provides a pressure relief component for a battery cell, wherein the pressure relief component is provided with a notched groove, wherein the notched groove extends along a closed trajectory and encloses a pressure relief area, wherein the notched groove includes a first groove segment and a second groove segment, wherein the first groove segment and the second groove segment are both arc segments, and the first groove segment is bent toward the center point of the pressure relief area, and the second groove segment is bent away from the center point of the pressure relief area.

[0009] In the above technical solution, a scored groove is provided on the pressure relief component, and the scored groove extends along a closed trajectory and encloses a pressure relief zone. This allows the scored groove to open to relieve pressure when the internal pressure of the battery cell reaches a threshold, thereby reducing the possibility of thermal runaway or even explosion of the battery cell. The scored groove includes a first groove section and a second groove section, both of which are arc segments. This allows the first and second groove sections to extend smoothly and not easily form stress concentration points, thereby reducing the possibility of premature cracking caused by concentrated force in the first and second groove sections, thereby extending the service life of the battery cell. The first groove section curves toward the center point of the pressure relief zone, thereby reducing the force applied to the first groove section when the internal pressure of the battery cell acts on the pressure relief component. This reduces the possibility of deformation of the pressure relief zone and premature cracking of the scored groove, thereby extending the service life of the battery cell. The second groove section curves away from the center point of the pressure relief zone, thereby increasing the area of ​​the pressure relief zone. When the scored groove is opened under force, it forms a larger pressure relief channel, facilitating rapid pressure relief of the battery cell and further reducing the possibility of thermal runaway or even explosion of the battery cell.

[0010] According to some embodiments of the present application, there is an arc transition between the first slot segment and the second slot segment.

[0011] In the above technical solution, by making the arc transition between the first slot segment and the second slot segment, it is possible to prevent stress concentration points from forming between the first slot segment and the second slot segment, thereby reducing the possibility of premature cracking caused by force concentration between the first slot segment and the second slot segment, thereby extending the service life of the battery cell.

[0012] According to some embodiments of the present application, the notched groove further includes a third groove segment, the third groove segment and the first groove segment are spaced apart along the first direction, the second groove segment connects the first groove segment and the third groove segment, the third groove segment is an arc segment, and the third groove segment bends toward the center point of the pressure relief zone.

[0013] In the above technical solution, by providing a third groove section, and making the third groove section and the first groove section spaced apart along the first direction, the second groove section connects the first groove section and the third groove section, and the third groove section is an arc-shaped section, the extension of the third groove section can be smooth, and it is not easy to form a stress concentration point, thereby reducing the possibility of the third groove section being subjected to concentrated force and causing premature cracking, thereby extending the service life of the battery cell; and the third groove section is bent toward the center point of the pressure relief area, so that when the internal pressure of the battery cell acts on the pressure relief component, the third groove section is subjected to less force, thereby making the pressure relief area less likely to be deformed by force, and the possibility of the notched groove being cracked prematurely is less likely, thereby extending the service life of the battery cell.

[0014] According to some embodiments of the present application, the first slot segment and the third slot segment are symmetrically arranged relative to the center point of the pressure relief zone.

[0015] In the above technical solution, by arranging the first groove segment and the third groove segment symmetrically relative to the center point of the pressure relief zone, the force on the notched groove can be made more uniform, the pressure relief zone is less likely to be deformed by force, the deformation resistance is stronger, and the notched groove is less likely to crack prematurely, thereby extending the service life of the battery cell.

[0016] According to some embodiments of the present application, the notched groove further includes a fourth groove segment, the fourth groove segment and the second groove segment are spaced apart along the second direction, the first groove segment, the second groove segment, the third groove segment and the fourth groove segment are connected end to end to form a closed ring, the fourth groove segment is an arc segment, and the fourth groove segment is bent back to the center point of the pressure relief zone; the second direction intersects with the first direction.

[0017] In the above technical solution, by providing a fourth groove segment and making the fourth groove segment and the second groove segment spaced apart along the second direction, the first groove segment, the second groove segment, the third groove segment and the fourth groove segment are connected end to end to form a closed ring, and the fourth groove segment is an arc-shaped segment, which can make the extension of the fourth groove segment smooth and not easily form a stress concentration point, thereby reducing the possibility of premature cracking due to concentrated force in the fourth groove segment, thereby extending the service life of the battery cell; and the fourth groove segment is bent back to the center point of the pressure relief zone, which can make the area of ​​the pressure relief zone larger, and a larger pressure relief channel can be formed after the notched groove is opened under force, which facilitates the rapid pressure relief of the battery cell and further reduces the possibility of thermal runaway or even explosion of the battery cell.

[0018] According to some embodiments of the present application, the second direction is perpendicular to the first direction.

[0019] In the above technical solution, by making the first direction perpendicular to the second direction, the spacing direction between the first slot segment and the third slot segment, and the spacing direction between the second slot segment and the fourth slot segment can be made perpendicular, further making the force distribution of the notched groove more uniform, and the notched groove less likely to have stress concentration points, which can reduce the possibility of premature cracking due to force concentration in the notched groove and extend the service life of the battery cell.

[0020] According to some embodiments of the present application, the second slot segment and the fourth slot segment are symmetrically arranged relative to the center point of the pressure relief zone.

[0021] In the above technical solution, by arranging the second groove segment and the fourth groove segment symmetrically relative to the center point of the pressure relief zone, the force on the notched groove can be made more uniform, the pressure relief zone is less likely to be deformed by force, the deformation resistance is stronger, and the notched groove is less likely to crack prematurely, thereby extending the service life of the battery cell.

[0022] According to some embodiments of the present application, the pressure relief component is provided with a sink, and the notched groove is provided on the bottom wall of the sink.

[0023] In the above technical solution, the pressure relief component is provided with a sink, and the notched groove is provided on the bottom wall of the sink, so that when the pressure relief component is subjected to the internal pressure of the battery cell, the bottom wall of the sink is more easily deformed than other parts of the pressure relief component, so that when the internal pressure of the battery cell reaches a threshold, the notched groove can crack to form a pressure relief channel, thereby realizing the pressure relief of the battery cell.

[0024] According to some embodiments of the present application, the sink is arranged in a racetrack shape, a circle or an ellipse shape.

[0025] In the above technical solution, the sink is set in a runway shape, circular or elliptical shape, so that when the pressure relief component is subjected to the internal pressure of the battery cell, the bottom wall of the sink is evenly stressed, and the score groove is evenly stressed, which makes it less likely for stress concentration points to appear. The possibility of premature cracking caused by concentrated stress in the score groove can be reduced, thereby extending the service life of the battery cell.

[0026] According to some embodiments of the present application, the trough includes a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the third side wall are planes, the second side wall and the fourth side wall are arcuate surfaces, the first side wall is located on the outside of the first trough section, the second side wall is located on the outside of the second trough section, the third side wall is located on the outside of the third trough section, and the fourth side wall is located on the outside of the fourth trough section.

[0027] In the above technical solution, by setting the first side wall and the third side wall as planes, the lengths of the first side wall and the third side wall can be set longer, so that the area of ​​the sinking groove is larger; by setting the second side wall and the fourth side wall as arc-shaped surfaces, a larger sinking groove area can be further enclosed when the width of the sinking groove is limited, so that the area of ​​the pressure relief zone is also larger. After the notched groove is opened under force, a larger pressure relief channel can be formed, which facilitates the rapid pressure relief of the battery cell and further reduces the possibility of thermal runaway or even explosion of the battery cell.

[0028] According to some embodiments of the present application, the distance between the first slot segment and the first sidewall gradually increases from both ends to the middle of the first slot segment;

[0029] From both ends to the middle of the third slot section, the distance between the third slot section and the third side wall gradually increases.

[0030] In the above technical solution, by gradually increasing the distance between the first slot segment and the first side wall from both ends to the middle of the first slot segment, and gradually increasing the distance between the third slot segment and the third side wall from both ends to the middle of the third slot segment, the extension of the first slot segment and the third slot segment can be smooth, and stress concentration points are less likely to be formed, thereby reducing the possibility of premature cracking of the first slot segment and the third slot segment due to concentrated force, thereby extending the service life of the battery cell.

[0031] According to some embodiments of the present application, along the first direction, the distance between the first side wall and the third side wall is W1, the maximum distance between the first groove section and the first side wall is W2, and the maximum distance between the third groove section and the third side wall is W3, satisfying 10%*W1≤W2≤70%*W1, and 10%*W1≤W3≤70%*W1.

[0032] In the above technical solution, by ensuring that along the first direction, the distance W1 between the first side wall and the third side wall, the maximum distance W2 between the first groove section and the first side wall, and the maximum distance W3 between the third groove section and the third side wall satisfy 10%*W1≤W2≤70%*W1, and 10%*W1≤W3≤70%*W1, the preparation of the notched groove can be facilitated, and the first groove section and the third groove section are subjected to less force from inside the battery cell, thereby making it less likely that the pressure relief area will be deformed by force, and the improvement in anti-deformation ability is more obvious. The possibility of premature cracking of the notched groove is smaller, thereby extending the service life of the battery cell.

[0033] According to some embodiments of the present application, along the first direction, the distance between the first side wall and the third side wall is W1, the maximum distance between the first groove section and the first side wall is W2, and the maximum distance between the third groove section and the third side wall is W3, satisfying W2+W3<W1.

[0034] In the above technical solution, by ensuring that along the first direction, the distance W1 between the first side wall and the third side wall, the maximum distance W2 between the first groove segment and the first side wall, and the maximum distance W3 between the third groove segment and the third side wall satisfy W2+W3<W1, the first groove segment and the third groove segment are not connected, thereby reducing the problem of stress concentration and easy cracking at the connection between the first groove segment and the third groove segment. The possibility of premature cracking of the notched groove is reduced, thereby extending the service life of the battery cell.

[0035] According to some embodiments of the present application, the first slot segment includes a first sub-slot segment and a second sub-slot segment, the angle between the tangent of the first sub-slot segment and the first side wall is α1, and the angle between the tangent of the second sub-slot segment and the first side wall is α2, satisfying 40°≤α1≤80°, 40°≤α2≤80°.

[0036] In the above technical solution, the first groove section includes a first sub-groove section and a second sub-groove section. By making the angle α1 between the tangent of the first sub-groove section and the first side wall and the angle α2 between the tangent of the second sub-groove section and the first side wall satisfy 40°≤α1≤80° and 40°≤α2≤80°, on the one hand, the first groove section can be further away from the first side wall of the sink, so as to further reduce the pressure inside the battery cell on the first groove section; on the other hand, the corner amplitude at the connection between the first sub-groove section, the second sub-groove section and other groove sections can be reduced, thereby reducing the possibility of stress concentration points at the connection between the first sub-groove section, the second sub-groove section and other groove sections, so that the area enclosed by the notched groove is less likely to be deformed by force, has stronger deformation resistance, and is less likely to crack the notched groove prematurely, thereby extending the service life of the battery cell.

[0037] According to some embodiments of the present application, the length of the second groove segment is L1, the length of the fourth groove segment is L2, and the length of the notched groove is L, satisfying L1≥1 / 4*L, L2≥1 / 4*L.

[0038] In the above technical solution, by making the length L1 of the second groove segment, the length L2 of the fourth groove segment, and the length L of the scored groove satisfy L1 ≥ 1 / 4*L, L2 ≥ 1 / 4*L, the length of the second groove segment in the scored groove, which is subjected to greater force than the first groove segment, can be longer, and the length of the fourth groove segment, which is subjected to greater force than the third groove segment, can be longer. When the internal pressure of the battery cell reaches a threshold, the second groove segment and the fourth groove segment are easily opened to relieve pressure, and the area of ​​the pressure relief zone is larger. After the scored groove is forced to open, a larger pressure relief channel can be formed, which facilitates the rapid pressure relief of the battery cell and further reduces the possibility of thermal runaway or even explosion of the battery cell.

[0039] In a second aspect, the present application provides a battery cell, comprising the pressure relief component as described above, wherein the pressure relief component is configured to release internal pressure of the battery cell.

[0040] According to some embodiments of the present application, the battery cell further includes:

[0041] a housing having a wall portion;

[0042] Wherein, the pressure relief component is the wall portion.

[0043] In the above technical solution, the battery cell includes a shell having a wall portion, and the pressure relief component is the wall portion, so that when the pressure relief component is opened, that is, the shell is partially opened, the internal pressure of the battery cell can be released.

[0044] According to some embodiments of the present application, the battery cell further includes:

[0045] The housing has a wall portion, wherein the wall portion has a pressure relief hole;

[0046] Wherein, the pressure relief component is installed on the wall portion and covers the pressure relief hole.

[0047] In the above technical solution, the housing has a wall portion, the wall portion has a pressure relief hole, the pressure relief component is installed on the wall portion and covers the pressure relief hole, and the preparation and assembly of the pressure relief component are simple.

[0048] According to some embodiments of the present application, the housing includes:

[0049] The housing has an opening formed therein, and the housing is used to accommodate the electrode assembly;

[0050] an end cap for closing the opening;

[0051] Wherein, the end cover is the wall portion.

[0052] In the above technical solution, the end cover is a wall portion, so that when the pressure relief component is opened, that is, the end cover is partially opened, the internal pressure of the battery cell can be released.

[0053] According to some embodiments of the present application, the housing includes:

[0054] The housing has an opening formed therein, and the housing is used to accommodate the electrode assembly;

[0055] an end cap for closing the opening;

[0056] Wherein, the shell includes the wall portion.

[0057] In the above technical solution, the housing includes a wall portion, so that when the pressure relief component is opened, that is, the housing is partially opened, the internal pressure of the battery cell can be released.

[0058] In a third aspect, the present application provides a battery comprising the battery cell as described above.

[0059] In a fourth aspect, the present application provides an electrical device, comprising a battery as described above, wherein the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] 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. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0061] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0062] FIG2 is a schematic diagram of an exploded structure of a battery provided in some embodiments of the present application;

[0063] FIG3 is a schematic diagram of an exploded structure of a battery cell provided in some embodiments of the present application;

[0064] FIG4 is a schematic diagram of the three-dimensional structure of a pressure relief component provided in some embodiments of the present application;

[0065] FIG5 is a schematic structural diagram of a pressure relief component provided by some embodiments of the present application from one perspective;

[0066] FIG6 is a schematic cross-sectional view of the pressure relief component along line AA in FIG5 ;

[0067] FIG7 is a partial enlarged structural diagram of the pressure relief component at B in FIG6;

[0068] FIG8 is a perspective schematic diagram of a partial structure of a pressure relief component provided in some embodiments of the present application;

[0069] FIG9 is a schematic structural diagram of a pressure relief component provided by some embodiments of the present application from one perspective;

[0070] FIG10 is a partial enlarged structural diagram of the pressure relief component at position C in FIG5 ;

[0071] FIG11 is a schematic diagram of the explosion structure of the pressure relief component provided in other embodiments of the present application.

[0072] Icon: 1000-vehicle; 100-battery; 10-housing; 11-first sub-housing; 12-second sub-housing; 20-battery cell; 21-housing; 211-end cover; 2111-electrode terminal; 212-housing; 22-electrode assembly; 221-tab; 23-pressure relief component; 231-notched groove; 2311-first groove section; 2311a-first sub-groove section; 2311b-second sub-groove section; 2312-second groove section; 2313-third groove section; 2314-fourth groove section; 232-sink; 2321-first side wall; 2322-second side wall; 2323-third side wall; 2324-fourth side wall; 233-pressure relief hole; 200-controller; 300-motor; X-first direction; Y-second direction; Z-third direction.

[0073] Specific embodiment

[0074] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0075] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0076] The terms "first", "second" and the like in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0077] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the 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.

[0078] The term "plurality" used in this application refers to two or more (including two).

[0079] The battery referred to in the embodiments of this application refers to a single physical module that includes multiple battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. Batteries generally also include a housing for enclosing one or more battery cells or multiple battery modules. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0080] 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).

[0081] The battery cell further includes a shell having a wall portion, which may be an end cap or at least a portion of the shell. The end cap closes an opening of the shell to define an accommodating space for accommodating the electrode assembly.

[0082] Batteries, with their outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, are a vital component of today's new energy development. With the development of the new energy industry, batteries are gradually moving towards larger and more integrated designs. The development of battery technology requires simultaneous consideration of multiple design factors, such as energy density, discharge capacity, charge and discharge rate, and other performance parameters. Furthermore, the battery's service life also needs to be considered.

[0083] However, battery cells generate heat and gas during operation, which increases the internal pressure of the battery cells. If the internal pressure of the battery cells cannot be released in time, thermal runaway or even explosion may occur. Therefore, the battery cells can be provided with a pressure relief mechanism to form a pressure relief channel when the internal pressure of the battery cells reaches a threshold value, thereby releasing the internal pressure of the battery cells and reducing the possibility of thermal runaway of the battery cells. The pressure relief mechanism may include a notched groove formed on the outer shell of the battery cells. However, the internal pressure of the battery cells will change during the charge and discharge process, and the area around the notched groove is prone to deformation due to stress. In the process of repeated changes of the internal pressure of the battery cells increasing-decreasing-increasing, the area around the notched groove is also prone to repeated deformation, causing the area around the notched groove to be in a state of breathing fatigue for a long time, which is prone to premature cracking, and then causing leakage of the battery cells, affecting the normal charge and discharge of the battery cells, and shortening the service life of the battery cells.

[0084] Based on the above considerations, the present application provides a pressure relief component for a battery cell. The pressure relief component is provided with a notched groove, which extends along a closed trajectory and encloses a pressure relief area. The notched groove includes a first groove segment and a second groove segment. The first groove segment and the second groove segment are both arc segments, and the first groove segment is bent toward the center point of the pressure relief area, and the second groove segment is bent back toward the center point of the pressure relief area.

[0085] In the technical solution of the present application, a notched groove is provided in the pressure relief component, and the notched groove extends along a closed trajectory and encloses a pressure relief zone, so that the notched groove can be opened when the internal pressure of the battery cell reaches a threshold value to relieve pressure, thereby reducing the possibility of thermal runaway or even explosion of the battery cell; the notched groove includes a first groove section and a second groove section, and the first groove section and the second groove section are both arc sections, which can make the extension of the first groove section and the second groove section smooth and not easy to form a stress concentration point, thereby reducing the possibility of premature cracking caused by concentrated force on the first groove section and the second groove section, thereby extending the service life of the battery cell; the first groove section is curved toward the center point of the pressure relief zone, and because the pressure relief component is subjected to force, the pressure relief zone is opened. The periphery of the pressure zone is more prone to deformation, the stress is more concentrated, and the stress extends from the edge of the pressure relief zone to the center point of the pressure relief zone. Therefore, the closer the pressure relief zone is to the center point, the smaller the stress is. When the internal pressure of the battery cell acts on the pressure relief component, the first groove section is subjected to smaller force, which makes it less likely that the pressure relief zone will be deformed by force, and the possibility of premature cracking of the notched groove is smaller, thereby extending the service life of the battery cell; the second groove section bends back toward the center point of the pressure relief zone, which can make the area of ​​the pressure relief zone larger. After the notched groove is opened under force, a larger pressure relief channel can be formed, which facilitates the rapid pressure relief of the battery cell and further reduces the possibility of thermal runaway or even explosion of the battery cell.

[0086] The battery disclosed in the embodiments of the present application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft. The battery disclosed in the present application can be used to form a power supply system for the electrical equipment.

[0087] The present invention provides an electric device that uses a battery as a power source. The electric device may include, but is not limited to, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, and the like. 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, and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0088] The battery described in the embodiments of the present application is not limited to being applicable to the electrical equipment described above, but can also be applied to all electrical equipment that want to use batteries. However, for the sake of simplicity, the following embodiments are explained using an electrical equipment such as a vehicle as an example.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] Please refer to Figure 2, which is a schematic diagram of the exploded structure 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 first sub-housing 11 can be a hollow structure with one end open, and the second sub-housing 12 can be a plate-like structure, with the second sub-housing 12 covering the open side of the first sub-housing 11, 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 second sub-housing 12 covering the open side of the first sub-housing 11.

[0093] In some embodiments, the box body 10 may be a rectangular parallelepiped.

[0094] In other embodiments, the box body 10 may also be a cylinder.

[0095] In some embodiments, the box body 10 may be made of aluminum, aluminum alloy, or other metal materials, so that the box body 10 has a higher stress-bearing performance.

[0096] In other embodiments, the box body 10 may also be made of non-metallic materials with relatively high strength, such as carbon fiber, hard plastic, etc.

[0097] 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.

[0098] 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.

[0099] Please refer to Figure 3, which is a schematic diagram of the exploded structure 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.

[0100] 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.

[0101] 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 electrode terminals 2111 can be provided on the end cap 211. The electrode terminals 2111 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, aluminum alloy, etc. 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.

[0102] The housing 212 is a component that cooperates 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 housing 212 and the end cap 211 can be independent components. The housing 212 can be of various shapes and sizes. Specifically, the shape of the housing 212 can be determined according to the specific shape and size of the electrode assembly 22. The housing 212 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0103] In some embodiments, the housing 212 may be a hollow structure with an opening on one side, and the end cover 211 may be a flat plate that covers the opening of the housing 212 .

[0104] In other embodiments, both the end cover 211 and the shell 212 may be hollow structures with one side open, and the open side of the end cover 211 covers the open side of the shell 212 to jointly form an accommodating space.

[0105] In some embodiments, the end cover 211 and the housing 212 may be connected by welding.

[0106] In other embodiments, the end cover 211 and the housing 212 may also be fixedly connected by bonding, interference fit, or the like.

[0107] In some embodiments, the battery cells 20 may be in the form of a rectangular parallelepiped, so that a plurality of battery cells 20 can be closely arranged in a matrix, which is beneficial for improving the energy density of the battery 100 .

[0108] In other embodiments, the battery cell 20 may also be flat, cylindrical, or in other shapes.

[0109] 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 positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The separator is used to separate the positive and negative electrode sheets to avoid internal short circuits between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 22, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 221. The positive and negative electrode tabs may be located together at one end of the main body or at both ends of the main body respectively. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 221 connects to the electrode terminal 2111 to form a current loop.

[0110] Please refer to Figures 4 to 8, Figure 4 is a schematic diagram of the three-dimensional structure of the pressure relief component provided in some embodiments of the present application; Figure 5 is a schematic diagram of the structure of the pressure relief component provided in some embodiments of the present application from one perspective; Figure 6 is a schematic diagram of the cross-sectional structure of the pressure relief component along AA in Figure 5; Figure 7 is a schematic diagram of the partial enlarged structure of the pressure relief component at B in Figure 6; Figure 8 is a three-dimensional schematic diagram of the partial structure of the pressure relief component provided in some embodiments of the present application.

[0111] An embodiment of the present application provides a pressure relief component 23 for a battery cell 20. The pressure relief component 23 is provided with a notched groove 231. The notched groove 231 extends along a closed trajectory and encloses a pressure relief area. The notched groove 231 includes a first groove segment 2311 and a second groove segment 2312. The first groove segment 2311 and the second groove segment 2312 are both arc segments, and the first groove segment 2311 is bent toward the center point of the pressure relief area, and the second groove segment 2312 is bent away from the center point of the pressure relief area.

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

[0113] By providing a notched groove 231 in the pressure relief component 23, which extends along a closed trajectory and encloses a pressure relief zone, the notched groove 231 can open to relieve pressure when the internal pressure of the battery cell 20 reaches a threshold, thereby reducing the possibility of thermal runaway or even explosion of the battery cell 20. The notched groove 231 includes a first groove section 2311 and a second groove section 2312. Both the first and second groove sections 2311, 2312 are arcuate segments, which ensure smooth extension of the first and second groove sections 2311, 2312 and reduce the formation of stress concentration points. This reduces the possibility of premature cracking caused by concentrated force in the first and second groove sections 2311, 2312, thereby extending the service life of the battery cell 20. The first groove section 2311 curves toward the center of the pressure relief area. When the pressure relief component 23 is subjected to force, the periphery of the pressure relief area is more likely to deform, resulting in more concentrated stress. The stress extends from the edge of the pressure relief area toward the center of the pressure relief area. Therefore, the stress in the pressure relief area closer to the center is reduced. This results in a smaller force acting on the first groove section 2311 when the internal pressure of the battery cell 20 acts on the pressure relief component 23. This reduces the likelihood of deformation in the pressure relief area and premature cracking of the notched groove 231, thereby extending the service life of the battery cell 20. The second groove section 2312 curves away from the center of the pressure relief area, increasing the area of ​​the pressure relief area. When the notched groove 231 is opened under force, it forms a larger pressure relief channel, facilitating rapid pressure relief in the battery cell 20 and further reducing the likelihood of thermal runaway or even explosion of the battery cell 20.

[0114] According to some embodiments of the present application, the first slot segment 2311 and the second slot segment 2312 have an arc transition, that is, the connection between the first slot segment 2311 and the second slot segment 2312 is arranged in an arc.

[0115] By making the arc transition between the first groove section 2311 and the second groove section 2312, it is possible to prevent stress concentration points from being formed between the first groove section 2311 and the second groove section 2312, thereby reducing the possibility of premature cracking caused by concentrated force at the connection between the first groove section 2311 and the second groove section 2312, thereby extending the service life of the battery cell 20.

[0116] According to some embodiments of the present application, the notched groove 231 also includes a third groove section 2313, which is spaced apart from the first groove section 2311 along the first direction X. The second groove section 2312 connects the first groove section 2311 and the third groove section 2313. The third groove section 2313 is an arc-shaped section, and the third groove section 2313 bends toward the center point of the pressure relief area.

[0117] By providing the third groove section 2313 and spacing it from the first groove section 2311 along the first direction X, the distribution of the scored grooves 231 is more even, reducing the likelihood of stress concentration points in the scored grooves 231 and premature cracking, thereby extending the service life of the battery cell 20. The second groove section 2312 connects the first and third groove sections 2311 and 2313. The third groove section 2313 is an arc-shaped section, which ensures a smooth extension of the third groove section 2313 and reduces the likelihood of stress concentration points. This reduces the likelihood of premature cracking caused by concentrated force in the third groove section 2313, thereby extending the service life of the battery cell 20. Furthermore, the third groove section 2313 curves toward the center of the pressure relief area, reducing the force applied to the third groove section 2313 when the internal pressure of the battery cell 20 acts on the pressure relief component 23. This reduces the likelihood of deformation in the pressure relief area and premature cracking of the scored groove 231, thereby extending the service life of the battery cell 20.

[0118] According to some embodiments of the present application, there is an arc transition between the second slot segment 2312 and the third slot segment 2313, which can make the transition portion between the second slot segment 2312 and the third slot segment 2313 smooth and less likely to form a stress concentration point, thereby reducing the possibility of premature cracking caused by concentrated force at the connection between the second slot segment 2312 and the third slot segment 2313, thereby extending the service life of the battery cell 20.

[0119] Please refer to FIG9 , which is a schematic structural diagram from one perspective of a pressure relief component provided in some embodiments of the present application.

[0120] According to some embodiments of the present application, the first slot segment 2311 and the third slot segment 2313 are symmetrically arranged relative to the center point of the pressure relief zone.

[0121] The center point of the pressure relief zone may be the geometric center point of the pressure relief zone.

[0122] By arranging the first groove section 2311 and the third groove section 2313 symmetrically relative to the center point of the pressure relief zone, the force applied to the notched groove 231 can be made more uniform, the pressure relief zone is less likely to be deformed by force, the deformation resistance is stronger, and the notched groove 231 is less likely to crack prematurely, thereby extending the service life of the battery cell 20.

[0123] According to some embodiments of the present application, the scored groove 231 also includes a fourth groove segment 2314, and the fourth groove segment 2314 and the second groove segment 2312 are spaced apart along the second direction Y. The first groove segment 2311, the second groove segment 2312, the third groove segment 2313 and the fourth groove segment 2314 are connected end to end to form a closed ring. The fourth groove segment 2314 is an arc segment, and the fourth groove segment 2314 is bent back to the center point of the pressure relief area; the second direction Y intersects with the first direction X.

[0124] By providing the fourth groove section 2314 and spacing it from the second groove section 2312 along the second direction Y, the distribution of the scored grooves 231 is more even, reducing the likelihood of stress concentration points in the scored grooves 231 and premature cracking in the scored grooves 231, thereby extending the service life of the battery cells 20. The first groove section 2311, the second groove section 2312, the third groove section 2313, and the fourth groove section 2314 are connected end to end to form a closed annular ring. This allows the scored grooves 231 to open when thermal runaway occurs in the battery cell 20, and the pressure relief area is separated from the rest of the pressure relief component 23, forming a larger pressure relief channel. This facilitates rapid pressure relief in the battery cell 20 and further reduces the likelihood of thermal runaway or even explosion of the battery cell 20. The fourth groove section 2314 is an arc-shaped section, which ensures smooth extension and reduces the formation of stress concentration points. This reduces the possibility of premature cracking due to concentrated stress on the fourth groove section 2314, thereby extending the service life of the battery cell 20. Furthermore, the fourth groove section 2314 curves away from the center point of the pressure relief zone, which increases the area of ​​the pressure relief zone. When the scored groove 231 is opened under pressure, a larger pressure relief channel is formed, facilitating rapid pressure relief of the battery cell 20 and further reducing the possibility of thermal runaway or even explosion of the battery cell 20.

[0125] According to some embodiments of the present application, arc transitions can be provided between the third slot segment 2313 and the fourth slot segment 2314, and between the fourth slot segment 2314 and the first slot segment 2311, so that the transition portions between the third slot segment 2313 and the fourth slot segment 2314, and between the fourth slot segment 2314 and the first slot segment 2311 are smooth and less likely to form stress concentration points, thereby reducing the possibility of premature cracking due to concentrated force at the connection between the third slot segment 2313 and the fourth slot segment 2314, and at the connection between the fourth slot segment 2314 and the first slot segment 2311, thereby extending the service life of the battery cell 20.

[0126] According to some embodiments of the present application, the second direction Y is perpendicular to the first direction X.

[0127] By making the first direction X perpendicular to the second direction Y, the spacing direction between the first slot segment 2311 and the third slot segment 2313 and the spacing direction between the second slot segment 2312 and the fourth slot segment 2314 can be made perpendicular, further making the force distribution of the notched groove 231 more uniform. The notched groove 231 is less likely to have stress concentration points, which can reduce the possibility of premature cracking caused by force concentration in the notched groove 231, thereby extending the service life of the battery cell 20.

[0128] According to some embodiments of the present application, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The first direction X is parallel to the width direction of the pressure relief component 23, the second direction Y is parallel to the length direction of the pressure relief component 23, and the third direction Z is parallel to the thickness direction of the pressure relief component 23.

[0129] According to some embodiments of the present application, the second slot segment 2312 and the fourth slot segment 2314 are symmetrically arranged relative to the center point of the pressure relief zone.

[0130] By arranging the second groove section 2312 and the fourth groove section 2314 symmetrically relative to the center point of the pressure relief zone, the force applied to the notched groove 231 can be made more uniform, the pressure relief zone is less likely to be deformed by force, the deformation resistance is stronger, and the notched groove 231 is less likely to crack prematurely, thereby extending the service life of the battery cell 20.

[0131] According to some embodiments of the present application, the depths of the first slot segment 2311 , the second slot segment 2312 , and the fourth slot segment 2314 are greater than the depth of the third slot segment 2313 .

[0132] The depth of the notch groove 231 is the dimension of the notch groove 231 in the third direction Z.

[0133] By making the depths of the first slot section 2311, the second slot section 2312 and the fourth slot section 2314 greater than the depth of the third slot section 2313, the first slot section 2311, the second slot section 2312 and the fourth slot section 2314 can be forced to open before the second slot section 2312 to form a pressure relief channel, and the area of ​​the pressure relief component 23 enclosed by the notched groove 231 remains connected to other areas, reducing the possibility of damage caused by interference with other components after the area enclosed by the notched groove 231 is separated from other areas.

[0134] In other embodiments, the depth of the other three slot sections among the first slot section 2311, the second slot section 2312, the third slot section 2313, and the fourth slot section 2314 may be greater than the depth of another slot section. For example, the depth of the first slot section 2311, the second slot section 2312, and the third slot section 2313 is greater than the depth of the fourth slot section 2314.

[0135] In other embodiments, the depth of two connected slot segments among the first slot segment 2311, the second slot segment 2312, the third slot segment 2313, and the fourth slot segment 2314 may be greater than the depth of the other two slot segments. For example, the depth of the first slot segment 2311 and the second slot segment 2312 is greater than the depth of the third slot segment 2313 and the fourth slot segment 2314.

[0136] In other embodiments, the depth of one of the first slot segment 2311, the second slot segment 2312, the third slot segment 2313, and the fourth slot segment 2314 may be greater than the depths of the other three slot segments. For example, the depth of the first slot segment 2311 is greater than the depths of the second slot segment 2312, the third slot segment 2313, and the fourth slot segment 2314.

[0137] In other embodiments, the depths of multiple slot segments that are greater than the depths of other slot segments can be the same or different. For example, if the depths of the first slot segment 2311, the second slot segment 2312, and the fourth slot segment 2314 are greater than the depth of the third slot segment 2313, the depths of the first slot segment 2311, the second slot segment 2312, and the fourth slot segment 2314 can also be different. For example, the depth of the first slot segment 2311 is greater than the depth of the fourth slot segment 2314, and the depth of the second slot segment 2312 is greater than the depth of the first slot segment 2311. This allows the second slot segment 2312, the first slot segment 2311, the fourth slot segment 2314, and the third slot segment 2313 to open sequentially when the internal pressure of the battery cell 20 reaches a threshold. The greater the internal pressure of the battery cell 20, the more slot segments are opened, resulting in a larger area of ​​the pressure relief channel and a faster pressure relief rate.

[0138] According to some embodiments of the present application, the pressure relief component 23 is provided with a sink 232 , and the notched groove 231 is provided on the bottom wall of the sink 232 .

[0139] The bottom wall of the sink 232 is arranged opposite to the opening of the sink 232 , and the side wall of the sink 232 refers to the wall surrounding the bottom wall of the sink 232 .

[0140] The pressure relief component 23 is provided with a sink 232, and the notched groove 231 is provided on the bottom wall of the sink 232, so that when the pressure relief component 23 is subjected to the internal pressure of the battery cell 20, the bottom wall of the sink 232 is more likely to deform than other parts of the pressure relief component 23, so that when the internal pressure of the battery cell 20 reaches a threshold, the notched groove 231 can crack to form a pressure relief channel, thereby realizing the pressure relief of the battery cell 20.

[0141] According to some embodiments of the present application, the sink 232 is arranged in a racetrack shape.

[0142] In other embodiments, the sink 232 may also be provided in other shapes such as a circle or an ellipse.

[0143] The sinking groove 232 is set in a runway shape, a circle or an ellipse, so that when the pressure relief component 23 is subjected to the internal pressure of the battery cell 20, the bottom wall of the sinking groove 232 can be evenly stressed, and the score groove 231 can be evenly stressed, which makes it less likely for stress concentration points to appear. The possibility of premature cracking caused by concentrated stress in the score groove 231 can be reduced, thereby extending the service life of the battery cell 20.

[0144] According to some embodiments of the present application, the sink 232 includes a first side wall 2321, a second side wall 2322, a third side wall 2323 and a fourth side wall 2324, the first side wall 2321 and the third side wall 2323 are planes, the second side wall 2322 and the fourth side wall 2324 are arcuate surfaces, the first side wall 2321 is located on the outside of the first groove section 2311, the second side wall 2322 is located on the outside of the second groove section 2312, the third side wall 2323 is located on the outside of the third groove section 2313, and the fourth side wall 2324 is located on the outside of the fourth groove section 2314.

[0145] The outer side of the first slot segment 2311 refers to the side of the first slot segment 2311 away from the center of the pressure relief zone, the outer side of the second slot segment 2312 refers to the side of the second slot segment 2312 away from the center of the pressure relief zone, the outer side of the third slot segment 2313 refers to the side of the third slot segment 2313 away from the center of the pressure relief zone, and the outer side of the fourth slot segment 2314 refers to the side of the fourth slot segment 2314 away from the center of the pressure relief zone.

[0146] Because the pressure relief component 23 provided in some embodiments of the present application is rectangular, its width along the first direction X is relatively narrow, while its length along the second direction Y is relatively long. This limits the size of the recessed groove 232 provided on the pressure relief component 23 along the first direction X, while allowing for a larger size along the second direction Y. Therefore, by configuring the first sidewall 2321 and the third sidewall 2323 as flat surfaces, the lengths of the first and third sidewalls 2321 and 2323 can be increased, thereby increasing the area of ​​the recessed groove 232. By configuring the second sidewall 2322 and the fourth sidewall 2324 as curved surfaces, a larger area of ​​the recessed groove 232 can be enclosed, even with the width of the recessed groove 232 being limited. This also increases the area of ​​the pressure relief zone. When the scored groove 231 is opened under force, a larger pressure relief channel is formed, facilitating rapid pressure relief of the battery cell 20 and further reducing the possibility of thermal runaway or even explosion of the battery cell 20.

[0147] In other embodiments, the first side wall 2321 and the third side wall 2323 may also be arc-shaped surfaces, and the second side wall 2322 and the fourth side wall 2324 may also be flat surfaces.

[0148] In other embodiments, the first side wall 2321 , the second side wall 2322 , the third side wall 2323 , and the fourth side wall 2324 may be configured as arcuate surfaces or flat surfaces according to the shape of the pressure relief component 23 .

[0149] According to some embodiments of the present application, the distance between the first slot segment 2311 and the first sidewall 2321 gradually increases from both ends to the middle of the first slot segment 2311. The distance between the third slot segment 2313 and the third sidewall 2323 gradually increases from both ends to the middle of the third slot segment 2313.

[0150] The distance between the first slot section 2311 and the first side wall 2321 is the distance between the first slot section 2311 and the first side wall 2321 along the first direction X. The distance between the third slot section 2313 and the third side wall 2323 is the distance between the third slot section 2313 and the third side wall 2323 along the first direction X.

[0151] By gradually increasing the distance between the first groove section 2311 and the first side wall 2321 from both ends of the first groove section 2311 to the middle, and gradually increasing the distance between the third groove section 2313 and the third side wall 2323 from both ends of the third groove section 2313 to the middle, the extension of the first groove section 2311 and the third groove section 2313 can be smooth, and stress concentration points are less likely to be formed, thereby reducing the possibility of premature cracking of the first groove section 2311 and the third groove section 2313 due to concentrated force, thereby extending the service life of the battery cell 20.

[0152] In other embodiments, the distance between the first slot section 2311 and the first side wall 2321 may gradually increase from both ends to the middle, while remaining unchanged. That is, the first slot section 2311 may partially extend in a direction away from the first side wall 2321, while partially extend in a direction parallel to the first side wall 2321.

[0153] In other embodiments, the distance between the first slot section 2311 and the first side wall 2321 may gradually increase from one end of the first slot section 2311 to the middle, while the distance between the other end of the first slot section 2311 and the first side wall 2321 remains unchanged.

[0154] Please refer to FIG10 , which is a partial enlarged structural diagram of the pressure relief component at point C in FIG5 .

[0155] According to some embodiments of the present application, along the first direction X, the distance between the first side wall 2321 and the third side wall 2323 is W1, the maximum distance between the first groove section 2311 and the first side wall 2321 is W2, and the maximum distance between the third groove section 2313 and the third side wall 2323 is W3, satisfying 10%*W1≤W2≤70%*W1, 10%*W1≤W3≤70%*W1, for example, W2 can be 10%*W1, 40%*W1 or 70%*W1, etc., and W3 can be 10%*W1, 35%*W1 or 70%*W1, etc.

[0156] By ensuring that along the first direction X, the distance W1 between the first side wall 2321 and the third side wall 2323, the maximum distance W2 between the first groove section 2311 and the first side wall 2321, and the maximum distance W3 between the third groove section 2313 and the third side wall 2323 satisfy 10%*W1≤W2≤70%*W1 and 10%*W1≤W3≤70%*W1, the preparation of the notched groove 231 can be facilitated, and the first groove section 2311 and the third groove section 2313 are subjected to less force from inside the battery cell 20, thereby making it less likely that the pressure relief area will be deformed by force, the anti-deformation ability is improved more significantly, and the notched groove 231 is less likely to crack prematurely, thereby extending the service life of the battery cell 20.

[0157] According to some embodiments of the present application, along the first direction X, the distance between the first side wall 2321 and the third side wall 2323 is W1, the maximum distance between the first groove section 2311 and the first side wall 2321 is W2, and the maximum distance between the third groove section 2313 and the third side wall 2323 is W3, satisfying W2+W3<W1.

[0158] By ensuring that along the first direction X, the distance W1 between the first side wall 2321 and the third side wall 2323, the maximum distance W2 between the first groove section 2311 and the first side wall 2321, and the maximum distance W3 between the third groove section 2313 and the third side wall 2323 satisfy W2+W3<W1, the first groove section 2311 and the third groove section 2313 are not connected, thereby reducing the problem of stress concentration and easy cracking at the connection between the first groove section 2311 and the third groove section 2313, and the possibility of premature cracking of the notched groove 231 is reduced, thereby extending the service life of the battery cell 20.

[0159] According to some embodiments of the present application, the first slot segment 2311 includes a first sub-slot segment 2311a and a second sub-slot segment 2311b, and the angle between the tangent of the first sub-slot segment 2311a and the first side wall 2321 is α1, and the angle between the tangent of the second sub-slot segment 2311b and the first side wall 2321 is α2, satisfying 40°≤α1≤80°, 40°≤α2≤80°, for example, α1 can be 40°, 60° or 80°, etc., and α2 can be 40°, 55° or 80°, etc.

[0160] The first slot segment 2311 includes a first sub-slot segment 2311a and a second sub-slot segment 2311b. By making the angle α1 between the tangent of the first sub-slot segment 2311a and the first side wall 2321 and the angle α2 between the tangent of the second sub-slot segment 2311b and the first side wall 2321 satisfy 40°≤α1≤80°, and 40°≤α2≤80°, on the one hand, the first slot segment 2311 can be further away from the first side wall 2321 of the sink 232, thereby further reducing the electric shock to the first slot segment 2311. On the other hand, it can reduce the corner amplitude of the connection between the first sub-slot segment 2311a, the second sub-slot segment 2311b and other slot segments, thereby reducing the possibility of stress concentration points being generated at the connection between the first sub-slot segment 2311a, the second sub-slot segment 2311b and other slot segments, making the area enclosed by the notched groove 231 less likely to be deformed by force, and having stronger anti-deformation ability, and less likely to crack the notched groove 231 in advance, thereby extending the service life of the battery cell 20.

[0161] According to some embodiments of the present application, the third slot segment 2313 includes a third sub-slot segment 2313a and a fourth sub-slot segment 2313b, and the angle between the tangent of the third sub-slot segment 2313a and the third side wall 2323 is α3, and the angle between the tangent of the fourth sub-slot segment 2313b and the third side wall 2323 is α4, satisfying 40°≤α3≤80°, 40°≤α4≤80°, for example, α3 can be 40°, 65° or 80°, etc., and α4 can be 40°, 50° or 80°, etc.

[0162] By ensuring that the angle α3 between the tangent of the third sub-segment 2313a and the third side wall 2323 and the angle α4 between the tangent of the fourth sub-segment 2313b and the third side wall 2323 satisfy 40°≤α3≤80° and 40°≤α4≤80°, on the one hand, the third slot segment 2313 can be further away from the third side wall 2323 of the sink 232, thereby further reducing the pressure on the third slot segment 2313 from the inside of the battery cell. On the other hand, the angle of the connection between the third and fourth sub-segments 2313a, 2313b and other slot segments can be reduced, thereby reducing the possibility of stress concentration points being generated at the connection between the third and fourth sub-segments 2313a, 2313b and other slot segments. As a result, the area enclosed by the notched groove 231 is less likely to be deformed by force, has stronger deformation resistance, and is less likely to crack prematurely, thereby extending the service life of the battery cell 20.

[0163] According to some embodiments of the present application, the length of the second groove segment 2312 is L1, the length of the fourth groove segment 2314 is L2, and the length of the notched groove 231 is L, satisfying L1≥1 / 4*L, L2≥1 / 4*L, for example, L1 can be 1 / 4*L, 1 / 3*L or 2 / 5*L, etc., and L2 can be 1 / 4*L, 1 / 3*L or 2 / 5*L, etc.

[0164] By ensuring that the length L1 of the second groove section 2312, the length L2 of the fourth groove section 2314, and the length L of the notched groove 231 satisfy L1 ≥ 1 / 4*L and L2 ≥ 1 / 4*L, the second groove section 2312 in the notched groove 231, which is subjected to greater force than the first groove section 2311, can be made longer, and the fourth groove section 2314, which is subjected to greater force than the third groove section 2313, can be made longer. When the internal pressure of the battery cell 20 reaches a threshold, the second groove section 2312 and the fourth groove section 2314 can be easily opened for pressure relief, and the area of ​​the pressure relief zone can be larger. After the notched groove 231 is forced to open, a larger pressure relief channel can be formed, thereby facilitating rapid pressure relief of the battery cell 20 and further reducing the possibility of thermal runaway or even explosion of the battery cell 20.

[0165] 3 and 4 , an embodiment of the present application provides a battery cell 20 , including the pressure relief component 23 provided in any of the above embodiments. The pressure relief component 23 is configured to release the internal pressure of the battery cell 20 .

[0166] According to some embodiments of the present application, the battery cell 20 further includes a housing 21 having a wall portion, and the pressure relief component 23 is the wall portion, that is, the scored groove 231 and the sunken groove 232 are directly formed on the wall portion.

[0167] The battery cell 20 includes a housing 21 having a wall portion. The pressure relief component 23 is the wall portion, so that when the pressure relief component 23 is opened, that is, the housing 21 is partially opened, the internal pressure of the battery cell 20 can be released.

[0168] Please refer to Figure 11, which is a schematic diagram of the exploded structure of pressure relief components provided in other embodiments of the present application. This embodiment of the present application provides another battery cell 20, comprising a pressure relief component 23 provided in any of the above embodiments and a housing 21. The pressure relief component 23 is configured to release internal pressure in the battery cell 20. The housing 21 has a wall 24 with a pressure relief hole 241. The pressure relief component 23 is mounted on the wall 24 and covers the pressure relief hole 241. The pressure relief component 23 is simple to manufacture and assemble.

[0169] According to some embodiments of the present application, the outer shell 21 includes an end cover 211 and a shell 212, and a receiving cavity with an opening is formed inside the shell 212, and the receiving cavity is used to receive the electrode assembly 22, and the end cover 211 closes the opening, wherein the end cover 211 is the wall portion of the battery cell 20 provided in any of the above embodiments.

[0170] The end cover 211 is a wall portion, so that when the pressure relief component 23 is opened, that is, the end cover 211 is partially opened, the internal pressure of the battery cell 20 can be released.

[0171] According to some embodiments of the present application, the outer shell 21 includes an end cover 211 and a shell 212, and a accommodating cavity with an opening is formed inside the shell 212, and the accommodating cavity is used to accommodate the electrode assembly 22, and the end cover 211 closes the opening, wherein the shell 212 includes the wall portion of the battery cell 20 provided in any of the above embodiments.

[0172] The housing 212 includes a wall portion, so that when the pressure relief component 23 is opened, that is, the housing 212 is partially opened, the internal pressure of the battery cell 20 can be released.

[0173] 2 , according to some embodiments of the present application, the present application also provides a battery 100 , comprising the battery cell 20 provided in any of the above embodiments.

[0174] 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.

[0175] Referring to Figures 3 to 11 , an embodiment of the present application provides a pressure relief component 23. The pressure relief component 23 is provided with a notched groove 231. The notched groove 231 extends along a closed trajectory and encloses a pressure relief area. The notched groove 231 includes a first groove segment 2311, a second groove segment 2312, a third groove segment 2313, and a fourth groove segment 2314. The first groove segment 2311, the second groove segment 2312, the third groove segment 2313, and the fourth groove segment 2314 are connected end to end to form a closed annular shape. The first groove segment 2311 and the third groove segment 2313 are spaced apart along a first direction X, and the second groove segment 2312 and the fourth groove segment 2314 are spaced apart along a second direction Y. The first slot section 2311, the second slot section 2312, the third slot section 2313, and the fourth slot section 2314 are all arc segments. The first slot section 2311 and the third slot section 2313 curve toward the center point of the pressure relief zone, and the first slot section 2311 and the third slot section 2313 are symmetrically arranged relative to the center point of the pressure relief zone. The second slot section 2312 and the fourth slot section 2314 curve away from the center point of the pressure relief zone. The second slot section 2312 and the fourth slot section 2314 are symmetrically arranged relative to the center point of the pressure relief zone. Arc transitions are formed between the first slot section 2311 and the second slot section 2312, between the second slot section 2312 and the third slot section 2313, between the third slot section 2313 and the fourth slot section 2314, and between the fourth slot section 2314 and the first slot section 2311.

[0176] The pressure relief component 23 is provided with a recessed groove 232, and a notched groove 231 is provided on the bottom wall of the recessed groove 232. The recessed groove 232 is arranged in a racetrack shape. The recessed groove 232 includes a first sidewall 2321, a second sidewall 2322, a third sidewall 2323, and a fourth sidewall 2324. The first sidewall 2321 and the third sidewall 2323 are flat surfaces, while the second sidewall 2322 and the fourth sidewall 2324 are curved surfaces. The first sidewall 2321 is located outside the first groove section 2311, the second sidewall 2322 is located outside the second groove section 2312, the third sidewall 2323 is located outside the third groove section 2313, and the fourth sidewall 2324 is located outside the fourth groove section 2314.

[0177] The distance between the first slot section 2311 and the first side wall 2321 gradually increases from both ends to the middle of the first slot section 2311. The distance between the third slot section 2313 and the third side wall 2323 gradually increases from both ends to the middle of the third slot section 2313.

[0178] Along the first direction X, the distance between the first side wall 2321 and the third side wall 2323 is W1, the maximum distance between the first groove section 2311 and the first side wall 2321 is W2, and the maximum distance between the third groove section 2313 and the third side wall 2323 is W3, satisfying 10%*W1≤W2≤70%*W1, 10%*W1≤W3≤70%*W1, and W2+W3<W1.

[0179] The first slot segment 2311 includes a first sub-slot segment 2311a and a second sub-slot segment 2311b. The angle between the tangent of the first sub-slot segment 2311a and the first side wall 2321 is α1, and the angle between the tangent of the second sub-slot segment 2312 and the first side wall 2321 is α2, satisfying 40°≤α1≤80° and 40°≤α2≤80°.

[0180] The third slot segment 2313 includes a third sub-slot segment 2313a and a fourth sub-slot segment 2313b. The angle between the tangent of the third sub-slot segment 2313a and the third side wall 2323 is α3, and the angle between the tangent of the fourth sub-slot segment 2313b and the third side wall 2323 is α4, satisfying 40°≤α3≤80°, 40°≤α4≤80°. For example, α3 can be 40°, 65° or 80°, and α4 can be 40°, 50° or 80°, etc.

[0181] The length of the second groove section 2312 is L1, the length of the fourth groove section 2314 is L2, and the length of the notched groove 231 is L, satisfying L1≥1 / 4*L and L2≥1 / 4*L.

[0182] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0183] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A pressure relief component for a battery cell, wherein: The pressure relief component is provided with a notched groove, which extends along a closed trajectory and encloses a pressure relief area. The notched groove includes a first groove segment and a second groove segment. The first groove segment and the second groove segment are both arc segments, and the first groove segment is bent toward the center point of the pressure relief area, and the second groove segment is bent away from the center point of the pressure relief area.

2. The pressure relief component according to claim 1, wherein: There is an arc transition between the first slot segment and the second slot segment.

3. The pressure relief component according to claim 1, wherein: The notched groove also includes a third groove segment, which is spaced apart from the first groove segment along the first direction, the second groove segment connects the first groove segment and the third groove segment, the third groove segment is an arc segment, and the third groove segment bends toward the center point of the pressure relief zone.

4. The pressure relief component according to claim 3, wherein: The first slot section and the third slot section are symmetrically arranged relative to a center point of the pressure relief zone.

5. The pressure relief component according to claim 3, wherein: The notched groove also includes a fourth groove segment, and the fourth groove segment is spaced apart from the second groove segment along the second direction. The first groove segment, the second groove segment, the third groove segment and the fourth groove segment are connected end to end to form a closed ring. The fourth groove segment is an arc segment, and the fourth groove segment bends away from the center point of the pressure relief zone; the second direction intersects with the first direction.

6. The pressure relief component according to claim 5, wherein: The second direction is perpendicular to the first direction.

7. The pressure relief component according to claim 5, wherein: The second slot section and the fourth slot section are symmetrically arranged relative to the center point of the pressure relief zone.

8. The pressure relief component according to claim 5, wherein: The pressure relief component is provided with a sink groove, and the notched groove is arranged on the bottom wall of the sink groove.

9. The pressure relief component according to claim 8, wherein: The sink is arranged in a racetrack shape, a circle or an ellipse.

10. The pressure relief component according to any one of claims 5 to 9, wherein: The sink groove includes a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the third side wall are planes, the second side wall and the fourth side wall are arcuate surfaces, the first side wall is located on the outside of the first groove section, the second side wall is located on the outside of the second groove section, the third side wall is located on the outside of the third groove section, and the fourth side wall is located on the outside of the fourth groove section.

11. The pressure relief component according to claim 10, wherein: From both ends to the middle of the first slot section, the distance between the first slot section and the first side wall gradually increases; From both ends of the third slot segment to the middle, the distance between the third slot segment and the third side wall gradually increases.

12. The pressure relief component according to claim 10, wherein: Along the first direction, the distance between the first side wall and the third side wall is W1, the maximum distance between the first groove section and the first side wall is W2, and the maximum distance between the third groove section and the third side wall is W3, satisfying 10%*W1≤W2≤70%*W1, 10%*W1≤W3≤70%*W1.

13. The pressure relief component according to claim 10, wherein: Along the first direction, the distance between the first side wall and the third side wall is W1, the maximum distance between the first groove section and the first side wall is W2, and the maximum distance between the third groove section and the third side wall is W3, satisfying W2+W3<W1.

14. The pressure relief component according to claim 10, wherein: The first slot segment includes a first sub-slot segment and a second sub-slot segment, the included angle between the tangent of the first sub-slot segment and the first side wall is α1, the included angle between the tangent of the second sub-slot segment and the first side wall is α2, satisfying 40°≤α1≤80°, 40°≤α2≤80°.

15. The pressure relief component according to any one of claims 5 to 14, wherein: The length of the second groove segment is L1, the length of the fourth groove segment is L2, and the length of the notched groove is L, satisfying L1≥1 / 4*L, L2≥1 / 4*L.

16. A battery cell, wherein: The pressure relief component according to any one of claims 1 to 15 is configured to release internal pressure of the battery cell.

17. The battery cell according to claim 16, wherein: The battery cell further comprises: a housing having a wall portion; Wherein, the pressure relief component is the wall portion.

18. The battery cell according to claim 16, wherein: The battery cell further comprises: A housing having a wall portion, wherein the wall portion has a pressure relief hole; Wherein, the pressure relief component is installed on the wall portion and covers the pressure relief hole.

19. The battery cell according to claim 17 or 18, wherein: The housing comprises: A housing having an opening formed therein, wherein the housing is used to accommodate the electrode assembly; an end cap for closing the opening; Wherein, the end cover is the wall portion.

20. The battery cell according to claim 17 or 18, wherein: The housing comprises: A housing having an opening formed therein, wherein the housing is used to accommodate the electrode assembly; an end cap for closing the opening; Wherein, the shell includes the wall portion.

21. A battery, wherein: The invention comprises a battery cell as claimed in any one of claims 16 to 20.

22. An electrical device, wherein: Comprising a battery as claimed in claim 21, the battery is used to provide electrical energy.

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